CA2009230C - Ink jet head, method for preparing same, orifice plate for use in same and ink jet device equipped with same - Google Patents
Ink jet head, method for preparing same, orifice plate for use in same and ink jet device equipped with sameInfo
- Publication number
- CA2009230C CA2009230C CA002009230A CA2009230A CA2009230C CA 2009230 C CA2009230 C CA 2009230C CA 002009230 A CA002009230 A CA 002009230A CA 2009230 A CA2009230 A CA 2009230A CA 2009230 C CA2009230 C CA 2009230C
- Authority
- CA
- Canada
- Prior art keywords
- discharge port
- ink jet
- plate
- main body
- jet head
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000037361 pathway Effects 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 30
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 claims 1
- 238000000206 photolithography Methods 0.000 claims 1
- 230000036211 photosensitivity Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 description 29
- 239000000758 substrate Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 241001274961 Rubus repens Species 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1601—Production of bubble jet print heads
- B41J2/1604—Production of bubble jet print heads of the edge shooter type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1623—Manufacturing processes bonding and adhesion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1631—Manufacturing processes photolithography
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/135—Nozzles
- B41J2/16—Production of nozzles
- B41J2/1621—Manufacturing processes
- B41J2/1632—Manufacturing processes machining
- B41J2/1634—Manufacturing processes machining laser machining
Abstract
A process is provided for preparing an ink jet head having a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening corresponding to the discharge port, an ink pathway communicated to the opening and an energy generating member for generating energy to be utilized for discharging ink from the discharge port, the main body being bonded to said discharge port plate. The process includes the steps of bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided, applying a pressure on at least the portion of the discharge port plate through which the discharge port is to be formed, that portion of the plate member being extruded into the opening of the main body, and forming the discharge port through the plate member which becomes the discharge port plate.
Description
200~230 This invention relates to an ink jet head which performs recording by jetting liquid to form flying droplets, a method for preparing the head, and an orifice plate provided with discharge ports or orifices for jetting liquid with which the head is equipped.
An ink jet recording head is formed basically of a discharge port plate or orifice plate, having ink discharge ports or orifices, a ceiling plate having concavities for forming ink pathways communicated with the respective orifices, and a substrate constituting a part of the liquid pathways and having an energy generating member which generates energy utilized for discharging ink.
The characteristics of an orifice for discharging ink affects ink discharge speed and ink discharge direction which in turn affect the characteristic of ink droplets produced, and therefore its precision, shape and the like are important. Above all, the shape of the portion where the liquid pathway and the orifice are communicated with each other and the shape of the orifice should be desirably determined so as to smooth the ink flow. However, in prior art ink jet heads the following problems have occurred in some cases. Because the sizes of the liquid pathway and the orifice are different at the communicated portion of the liquid pathway and the orifice, a smooth flow of ink is not achieved which somewhat reduces the discharge velocity. This lowering of the discharge velocity reduces the precision with which droplets are projected, leading sometimes to 2û092~0 deterioration of printing quality. Also, the shape of the orifice should preferably be tapered, gradually narrowing toward the tip end, in order to improve discharge performance, but it has been difficult to effect such shaping of the fine orifices of an ink jet recording head by use of an orifice plate with a small thickness.
The purpose of the present invention is to address the problems mentioned above, and one of its objects is to provide an ink jet recording head in which the transition from liquid pathway to the orifice is reasonably smooth and the orifice can have a tapered shape, together with a simple method for preparing the same.
According to the invention, there is provided a process for preparing an ink jet head having a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said process comprising the steps of: bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate _ 3 _ 2~0~0 member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
The invention also extends to an ink jet head including a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening and an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said head being formed by a process comprising the steps of: bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided; applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
The invention further extends to an ink jet head comprising: a discharge port plate through which a discharge port is formed for discharging ink; and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway ' ~ ~
- 2Q092~0 communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet head main body, the protrusion being effected by the application of pressure.
The invention further extends to a discharge port plate for an ink jet head having a discharge orifice, said discharge port plate comprising: a discharge port portion having a ~ischarge port provided therethrough for discharging ink; and a main body portion, wherein said main body portion of said plate being formed of a film, and said discharge port portion of said plate protruding from said main body portion upon the application of pressure for protrusion into the discharge orifice of the ink jet head.
Further features of the invention will become apparent from the following description with reference to the accompanying drawings in which:
Fig. 1 is a schematic sectional view showing an example of the liquid pathway portion of an ink jet recording head according to the present invention.
Fig. 2 is a sectional view showing an example of the liquid pathway portion of an ink jet recording , 2Q~2~
head according to the background art.
Fig. 3 is a schematic perspective view showing the head main body having a ceiling plate and a substrate bonded together.
Fig. 4 is a schematic perspective view showing the state having an orifice plate bonded to the head main body.
Fig. 5 is a schematic sectional view showing the liquid pathway portion in Fig. 4.
Fig. 6 is a schematic sectional view showing another example of the liquid pathway portion of an ink jet head according to the present invention.
Fig. 7 is a perspective view of appearance showing an example of the pertinent portion of an ink 15jet device according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Specific examples of the present invention are shown below.
Fig. 1 is a schematic sectional view representing well the specific features of the present invention and, in the same Figure, 1 is the substrate constituting a part of ink pathways, 2 is an energy generating member provided on the substrate 1, 3 is a 25 grooved ceiling plate having grooves ~concavities) for forming ink pathways, 4 is an orifice plate, and 5 is _ - 6 - 200~2~0 an orifice.
Next, by referring to the preparation method of the present invention, the specific features of the present invention are described. First, as shown in Fig.
3, the grooved ceiling plate 3 for formation of liquid pathways and the substrate 1 are bonded to form openings 6a communicated to the liquid pathways 6. Next, a dry film (trade-mark: SE-320 mfd. by Tokyo Oka, 20 - 30~m in thickness) which is a thermoplastic resin is bonded as the material for the orifice plate. In bonding, after a polyethylene (PE) film which is the protective film of the dry film is peeled off, the dry film is heated to about 60C. The dry film sufficiently heated is softened by heat. In such state, the dry film is pressure adhered onto the head main body having the grooved ceiling plate for formation of liquid pathways and the substrate bonded together in Fig. 3. During that operation or thereafter, pressure is applied particularly on the portion which becomes the orifice. Fig. 4 shows the state of the dry film bonded to the head main body, and Fig. 5 a schematic sectional view of the portions which become the liquid channel and the orifice. As can be seen from Fig. 5, the dry film when sufficiently softened protrudes to enter internally of the liquid pathway. Next, by utilizing the X
- ~ 7 ~ 20~30 characteristics of the dry film, which is a photo-sensitive resin, by use of a photomask necessary for the diameter of the orifice tip end, the orifice 5 (25 - 35~m in diameter) communicated to the liquid pathway 6 is formed by working according to the photolithographic steps of exposure and developing. At this time, by varying the exposure time, the taper angle of the orifice can be varied.
By employment of the method as described above, an orifice in a tapered shape communicated to the liquid pathway can be simply obtained.
In the following, another example of the present invention is described.
First, the substrate 1 and the grooved ceiling plate 3 for formation of liquid pathways are bonded together, and a dry film is bonded as the orifice plate, as in the foregoing example. In this example, the bonded dry film is subjected to W curing. Next, by use of a mask necessary for the diameter of the tip end of the orifice as in the foregoing example, the orifice is worked by an excimer laser (strength: 200 - 1OOOmJ/cm2).
At this time, by the angle of the laser beam, a tapered orifice is obtained. Also, depending on the material of the orifice plate and the working conditions of the laser, an orifice, the section of which follows a - - 8 - 2Q0~3a parabolic line as shown in Fig. 6 can be also obtained.
In the case of forming orifices by use of an excimer laser, in addition to the above-described dry film, an organic resin material which is softened by heating can be also used.
Also, as the energy generating element of the ink jet recording head of the present invention, an electrothermal transducer which generates heat energy to be utilized for discharging ink can be used. This also facilitates miniaturization of the whole recording head, and higher density arraying of discharge ports, and advantageously exploits the effects of the present invention.
Further, although we have shown examples of the ink jet head main body formed by bonding a ceiling plate with concavities for formation of ink pathways and a substrate with the concavities on its innerside thereby forming the ink pathways and openings communicated to the ink pathways, the ink jet head main body is not limited to this construction. That is, the ink jet head main body may be of any construction, provided that it has ink pathways to be communicated to the discharge ports provided on the orifice plate, and openings for intrusion of a part of the orifice plate into the ink pathways are provided. For X
- 200923~
g example, the ceiling plate having the concavities for forming the ink pathways in the examples as described above may be formed either as one member or with separate members for the side wall portion and the ceiling portion of the ink pathway.
In addition, the main body portion of the orifice plate according to the present invention should preferably be shaped from a film (flat plate shape) as described above, preferably one covering over the whole surface where the openings of the head main body are provided. The reason is that wiping of the orifice portion or aspiration by capping around the orifice, are performed in an ink jet device and during such operations, a large force may be applied indiscriminately on the orifice portion or the whole orifice plate. Such a shape and form are preferable for distributing the force as uniformly as possible throughout the orifice plate, and yet permitting the orifice plate to be firmly bonded to the head main body.
Fig. 7 is a perspective view showing an example of the pertinent portions of an ink jet recording device according to the present invention.
In the Figure 20, is a recording head equipped with a group of discharge ports for performing ink .~
~ lo - 2~23~
discharge opposite to the recording surface of a recording paper fed onto the platen 24. 16 is a carriage for holding the recording head 20, joined to a part of the driving belt 18 for transmitting the driving force of the driving motor 17, and by making it slidable with the two guide shafts l9A, l9B arranged in parallel to each other, reciprocal movement over the entire width of the recording paper of the recording head 20 becomes possible.
26 is a head restoring device, and may be positioned at one end of the moving route of the recording head 20, for example, at the position opposed to the home position. By actuating the head restoring device 26 by the driving force of the motor 22 through the transmission mechanism 23, capping of the recording head 20 is performed. In connection with the capping onto the recording head 20 by means of the cap portion 26A of the head restoring device 26, ink aspiration by a suitable aspiration means provided within the head restoring device 26 or ink pressure delivery by means of a suitable pressurization means provided in the ink feeding route to the recording head 20 is performed to force discharge of ink through the discharge port, thereby effecting the discharge restoration treatment such as removal of thickened ink within the ink pathways 200~2~0 communicated to the discharge ports. Also, by applying capping on completion of recording, the recording head can be protected.
33 is a blade forming a wiping member which is arranged at the side face of the head restoring device 26, and is formed of a silicone rubber. The blade 33 is held in cantilever manner on the blade holding member 31A, actuated by the motor 22 and the transmission mechanism 23 similarly to the head restoring device 26, whereby engagement with the discharge surface of the recording head 20 is rendered possible. In this way, at adequate frequency during the recording actuation of the recording head 20, or after the discharge restoration treatment by use of the head restoring device 26, the blade 33 is protruded into the moving route of the recording head 20 and wipes off dew drops, wetting or dust, etc. on the discharge surface of the head 20 in conjunction with movement of the head 20.
The present invention brings about excellent results particularly in a recording head or recording device of a BUBBLE JET (trade-mark) ink jet recording system.
The construction and operation of the recording head, and the recording apparatus of an ink jet system according to the present invention, may be, by way of preferred example basically in accordance with the disclosures of U.S. Patents 4,723,129 and 4,740,796.
This system is applicable to operation either of the so 20~ ,,5,?~
called on-demand type and the continuous type. The on-demand type is particularly effective because, by applying at least one driving signal which gives rapid temperature elevation exceeding nucleus boiling point, corresponding to the recording information, to electricity-heat convertors arranged corresponding to the sheets or liquid channels holding liquid ink, heat energy is generated at the electricity-heat convertors to effect film boiling at the direct-acting surface of the recording head, and consequently the bubbles within the liquid ink can be formed in one-to-one correspondence to the driving signals. By discharging the liquid ink through a discharge opening by growth and shrinkage of the bubble, at least one droplet is formed. By forming the driving signals into pulses, growth and shrinkage of the bubble can be effected almost instantaneously and adequately to accomplish discharge of the liquid ink with a particularly excellent response characteristic. As the driving signals of such pulse shapes as those disclosed 20 in U.S. Patents 4,463,359 and 4,345,262 are suitable.
Excellent recording can be performed by employment of the conditions described in U.S. Patent 4,313,124 in respect of the temperature elevation rate of the above-mentioned direct-acting surface.
The construction of the recording head, in addition to the combined features of discharging orifice, liquid channel, electricity-heat converter (linear liquid channel or right angle liquid channel) as disclosed in i .I f 2 ~ 3 ~
the above-mentioned respective specifications, may incorporate the features of U.S. Patents 4,558,333, 4,459,600 which disclose having the heat transfer portion arranged in a bent portion of the channel. In addition, the present invention can also effectively employ the structure disclosed in Japanese Patent Laid-Open Application No. 59-123670, which discloses using a slit common to a plurality of electricity-heat converters as the discharging portion of the electricity-heat converter, or Japanese Patent Laid-Open Application No.
59-138461 which discloses having an opening for absorbing pressure waves generated by heat energy, associated with the discharging portion.
Further, in a recording head of the full line type having a length corresponding to the maximum width of recording medium which can be recorded by the recording device, either a construction which provides its length by combination of a plurality of recording heads as disclosed in the above-mentioned specifications or a construction as one recording head, integrally formed, may be effectively used in the present invention.
In addition, the present invention is effective in a recording head of the freely exchangeable chip type which enables electrical connection to the main device or supply of ink from the main device by being mounted on the main device, or in a recording head of the cartridge type where it is provided integrally on the recording head itself.
q ~3 ~
The addition of auxiliary components to the recording head is usually preferred so that the effect of the present invention can be further stabilized.
Specific examples may include, for the recording head, capping means, cleaning means, pressurization or aspiration means, electricity-heat converters or other heating elements, pre-heating means, or any combination of these. The invention is also effective for performing stable recording in a preliminary mode in which discharging is performed separate from recording.
Further, according to the recording mode of the recording device, the present invention is extremely effective not only for recording in a primary single color such as black, but also in a device equipped with selectable plural different colors or full color by color mixing, whether the recording head is integrally constituted or several heads are combined.
The ink jet recording head made by the present invention has orifices and liquid passages communicated to each other, in a transition approaching ideal shape, whereby the ink flow is smoothed to improve the discharge speed of ink and also improve printing quality. The ink jet head according to the present invention can be made by the simple method of working the orifices by intruding the material for orifice plate into the inner portion of the liquid channel.
Furthermore, since a part of the orifice plate intrudes into the ink pathway, the orifice plate and the ''t~'l ~
- 15 _ 2QO~I2-J~
ink jet head main body are firmly bonded together.
Accordingly, even when force is applied onto the orifice plate, peeling off and displacement of the orifice plate from the ink jet head main body are securely prevented.
These properties are particularly important to those ink jet......
- 16 - 2~
1 apparatuses which are provided with a device for restoring failure of ink discharge of an ink jet head.
The reason is that in such ink jet apparatuses wiping of the orifice part and aspiration through capping 5 around the orifice are carried out as described above and the force applied onto the orifice part or the entirety of the orifice plate at that time is especially large.
An ink jet recording head is formed basically of a discharge port plate or orifice plate, having ink discharge ports or orifices, a ceiling plate having concavities for forming ink pathways communicated with the respective orifices, and a substrate constituting a part of the liquid pathways and having an energy generating member which generates energy utilized for discharging ink.
The characteristics of an orifice for discharging ink affects ink discharge speed and ink discharge direction which in turn affect the characteristic of ink droplets produced, and therefore its precision, shape and the like are important. Above all, the shape of the portion where the liquid pathway and the orifice are communicated with each other and the shape of the orifice should be desirably determined so as to smooth the ink flow. However, in prior art ink jet heads the following problems have occurred in some cases. Because the sizes of the liquid pathway and the orifice are different at the communicated portion of the liquid pathway and the orifice, a smooth flow of ink is not achieved which somewhat reduces the discharge velocity. This lowering of the discharge velocity reduces the precision with which droplets are projected, leading sometimes to 2û092~0 deterioration of printing quality. Also, the shape of the orifice should preferably be tapered, gradually narrowing toward the tip end, in order to improve discharge performance, but it has been difficult to effect such shaping of the fine orifices of an ink jet recording head by use of an orifice plate with a small thickness.
The purpose of the present invention is to address the problems mentioned above, and one of its objects is to provide an ink jet recording head in which the transition from liquid pathway to the orifice is reasonably smooth and the orifice can have a tapered shape, together with a simple method for preparing the same.
According to the invention, there is provided a process for preparing an ink jet head having a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said process comprising the steps of: bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate _ 3 _ 2~0~0 member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
The invention also extends to an ink jet head including a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening and an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said head being formed by a process comprising the steps of: bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided; applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
The invention further extends to an ink jet head comprising: a discharge port plate through which a discharge port is formed for discharging ink; and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway ' ~ ~
- 2Q092~0 communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet head main body, the protrusion being effected by the application of pressure.
The invention further extends to a discharge port plate for an ink jet head having a discharge orifice, said discharge port plate comprising: a discharge port portion having a ~ischarge port provided therethrough for discharging ink; and a main body portion, wherein said main body portion of said plate being formed of a film, and said discharge port portion of said plate protruding from said main body portion upon the application of pressure for protrusion into the discharge orifice of the ink jet head.
Further features of the invention will become apparent from the following description with reference to the accompanying drawings in which:
Fig. 1 is a schematic sectional view showing an example of the liquid pathway portion of an ink jet recording head according to the present invention.
Fig. 2 is a sectional view showing an example of the liquid pathway portion of an ink jet recording , 2Q~2~
head according to the background art.
Fig. 3 is a schematic perspective view showing the head main body having a ceiling plate and a substrate bonded together.
Fig. 4 is a schematic perspective view showing the state having an orifice plate bonded to the head main body.
Fig. 5 is a schematic sectional view showing the liquid pathway portion in Fig. 4.
Fig. 6 is a schematic sectional view showing another example of the liquid pathway portion of an ink jet head according to the present invention.
Fig. 7 is a perspective view of appearance showing an example of the pertinent portion of an ink 15jet device according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Specific examples of the present invention are shown below.
Fig. 1 is a schematic sectional view representing well the specific features of the present invention and, in the same Figure, 1 is the substrate constituting a part of ink pathways, 2 is an energy generating member provided on the substrate 1, 3 is a 25 grooved ceiling plate having grooves ~concavities) for forming ink pathways, 4 is an orifice plate, and 5 is _ - 6 - 200~2~0 an orifice.
Next, by referring to the preparation method of the present invention, the specific features of the present invention are described. First, as shown in Fig.
3, the grooved ceiling plate 3 for formation of liquid pathways and the substrate 1 are bonded to form openings 6a communicated to the liquid pathways 6. Next, a dry film (trade-mark: SE-320 mfd. by Tokyo Oka, 20 - 30~m in thickness) which is a thermoplastic resin is bonded as the material for the orifice plate. In bonding, after a polyethylene (PE) film which is the protective film of the dry film is peeled off, the dry film is heated to about 60C. The dry film sufficiently heated is softened by heat. In such state, the dry film is pressure adhered onto the head main body having the grooved ceiling plate for formation of liquid pathways and the substrate bonded together in Fig. 3. During that operation or thereafter, pressure is applied particularly on the portion which becomes the orifice. Fig. 4 shows the state of the dry film bonded to the head main body, and Fig. 5 a schematic sectional view of the portions which become the liquid channel and the orifice. As can be seen from Fig. 5, the dry film when sufficiently softened protrudes to enter internally of the liquid pathway. Next, by utilizing the X
- ~ 7 ~ 20~30 characteristics of the dry film, which is a photo-sensitive resin, by use of a photomask necessary for the diameter of the orifice tip end, the orifice 5 (25 - 35~m in diameter) communicated to the liquid pathway 6 is formed by working according to the photolithographic steps of exposure and developing. At this time, by varying the exposure time, the taper angle of the orifice can be varied.
By employment of the method as described above, an orifice in a tapered shape communicated to the liquid pathway can be simply obtained.
In the following, another example of the present invention is described.
First, the substrate 1 and the grooved ceiling plate 3 for formation of liquid pathways are bonded together, and a dry film is bonded as the orifice plate, as in the foregoing example. In this example, the bonded dry film is subjected to W curing. Next, by use of a mask necessary for the diameter of the tip end of the orifice as in the foregoing example, the orifice is worked by an excimer laser (strength: 200 - 1OOOmJ/cm2).
At this time, by the angle of the laser beam, a tapered orifice is obtained. Also, depending on the material of the orifice plate and the working conditions of the laser, an orifice, the section of which follows a - - 8 - 2Q0~3a parabolic line as shown in Fig. 6 can be also obtained.
In the case of forming orifices by use of an excimer laser, in addition to the above-described dry film, an organic resin material which is softened by heating can be also used.
Also, as the energy generating element of the ink jet recording head of the present invention, an electrothermal transducer which generates heat energy to be utilized for discharging ink can be used. This also facilitates miniaturization of the whole recording head, and higher density arraying of discharge ports, and advantageously exploits the effects of the present invention.
Further, although we have shown examples of the ink jet head main body formed by bonding a ceiling plate with concavities for formation of ink pathways and a substrate with the concavities on its innerside thereby forming the ink pathways and openings communicated to the ink pathways, the ink jet head main body is not limited to this construction. That is, the ink jet head main body may be of any construction, provided that it has ink pathways to be communicated to the discharge ports provided on the orifice plate, and openings for intrusion of a part of the orifice plate into the ink pathways are provided. For X
- 200923~
g example, the ceiling plate having the concavities for forming the ink pathways in the examples as described above may be formed either as one member or with separate members for the side wall portion and the ceiling portion of the ink pathway.
In addition, the main body portion of the orifice plate according to the present invention should preferably be shaped from a film (flat plate shape) as described above, preferably one covering over the whole surface where the openings of the head main body are provided. The reason is that wiping of the orifice portion or aspiration by capping around the orifice, are performed in an ink jet device and during such operations, a large force may be applied indiscriminately on the orifice portion or the whole orifice plate. Such a shape and form are preferable for distributing the force as uniformly as possible throughout the orifice plate, and yet permitting the orifice plate to be firmly bonded to the head main body.
Fig. 7 is a perspective view showing an example of the pertinent portions of an ink jet recording device according to the present invention.
In the Figure 20, is a recording head equipped with a group of discharge ports for performing ink .~
~ lo - 2~23~
discharge opposite to the recording surface of a recording paper fed onto the platen 24. 16 is a carriage for holding the recording head 20, joined to a part of the driving belt 18 for transmitting the driving force of the driving motor 17, and by making it slidable with the two guide shafts l9A, l9B arranged in parallel to each other, reciprocal movement over the entire width of the recording paper of the recording head 20 becomes possible.
26 is a head restoring device, and may be positioned at one end of the moving route of the recording head 20, for example, at the position opposed to the home position. By actuating the head restoring device 26 by the driving force of the motor 22 through the transmission mechanism 23, capping of the recording head 20 is performed. In connection with the capping onto the recording head 20 by means of the cap portion 26A of the head restoring device 26, ink aspiration by a suitable aspiration means provided within the head restoring device 26 or ink pressure delivery by means of a suitable pressurization means provided in the ink feeding route to the recording head 20 is performed to force discharge of ink through the discharge port, thereby effecting the discharge restoration treatment such as removal of thickened ink within the ink pathways 200~2~0 communicated to the discharge ports. Also, by applying capping on completion of recording, the recording head can be protected.
33 is a blade forming a wiping member which is arranged at the side face of the head restoring device 26, and is formed of a silicone rubber. The blade 33 is held in cantilever manner on the blade holding member 31A, actuated by the motor 22 and the transmission mechanism 23 similarly to the head restoring device 26, whereby engagement with the discharge surface of the recording head 20 is rendered possible. In this way, at adequate frequency during the recording actuation of the recording head 20, or after the discharge restoration treatment by use of the head restoring device 26, the blade 33 is protruded into the moving route of the recording head 20 and wipes off dew drops, wetting or dust, etc. on the discharge surface of the head 20 in conjunction with movement of the head 20.
The present invention brings about excellent results particularly in a recording head or recording device of a BUBBLE JET (trade-mark) ink jet recording system.
The construction and operation of the recording head, and the recording apparatus of an ink jet system according to the present invention, may be, by way of preferred example basically in accordance with the disclosures of U.S. Patents 4,723,129 and 4,740,796.
This system is applicable to operation either of the so 20~ ,,5,?~
called on-demand type and the continuous type. The on-demand type is particularly effective because, by applying at least one driving signal which gives rapid temperature elevation exceeding nucleus boiling point, corresponding to the recording information, to electricity-heat convertors arranged corresponding to the sheets or liquid channels holding liquid ink, heat energy is generated at the electricity-heat convertors to effect film boiling at the direct-acting surface of the recording head, and consequently the bubbles within the liquid ink can be formed in one-to-one correspondence to the driving signals. By discharging the liquid ink through a discharge opening by growth and shrinkage of the bubble, at least one droplet is formed. By forming the driving signals into pulses, growth and shrinkage of the bubble can be effected almost instantaneously and adequately to accomplish discharge of the liquid ink with a particularly excellent response characteristic. As the driving signals of such pulse shapes as those disclosed 20 in U.S. Patents 4,463,359 and 4,345,262 are suitable.
Excellent recording can be performed by employment of the conditions described in U.S. Patent 4,313,124 in respect of the temperature elevation rate of the above-mentioned direct-acting surface.
The construction of the recording head, in addition to the combined features of discharging orifice, liquid channel, electricity-heat converter (linear liquid channel or right angle liquid channel) as disclosed in i .I f 2 ~ 3 ~
the above-mentioned respective specifications, may incorporate the features of U.S. Patents 4,558,333, 4,459,600 which disclose having the heat transfer portion arranged in a bent portion of the channel. In addition, the present invention can also effectively employ the structure disclosed in Japanese Patent Laid-Open Application No. 59-123670, which discloses using a slit common to a plurality of electricity-heat converters as the discharging portion of the electricity-heat converter, or Japanese Patent Laid-Open Application No.
59-138461 which discloses having an opening for absorbing pressure waves generated by heat energy, associated with the discharging portion.
Further, in a recording head of the full line type having a length corresponding to the maximum width of recording medium which can be recorded by the recording device, either a construction which provides its length by combination of a plurality of recording heads as disclosed in the above-mentioned specifications or a construction as one recording head, integrally formed, may be effectively used in the present invention.
In addition, the present invention is effective in a recording head of the freely exchangeable chip type which enables electrical connection to the main device or supply of ink from the main device by being mounted on the main device, or in a recording head of the cartridge type where it is provided integrally on the recording head itself.
q ~3 ~
The addition of auxiliary components to the recording head is usually preferred so that the effect of the present invention can be further stabilized.
Specific examples may include, for the recording head, capping means, cleaning means, pressurization or aspiration means, electricity-heat converters or other heating elements, pre-heating means, or any combination of these. The invention is also effective for performing stable recording in a preliminary mode in which discharging is performed separate from recording.
Further, according to the recording mode of the recording device, the present invention is extremely effective not only for recording in a primary single color such as black, but also in a device equipped with selectable plural different colors or full color by color mixing, whether the recording head is integrally constituted or several heads are combined.
The ink jet recording head made by the present invention has orifices and liquid passages communicated to each other, in a transition approaching ideal shape, whereby the ink flow is smoothed to improve the discharge speed of ink and also improve printing quality. The ink jet head according to the present invention can be made by the simple method of working the orifices by intruding the material for orifice plate into the inner portion of the liquid channel.
Furthermore, since a part of the orifice plate intrudes into the ink pathway, the orifice plate and the ''t~'l ~
- 15 _ 2QO~I2-J~
ink jet head main body are firmly bonded together.
Accordingly, even when force is applied onto the orifice plate, peeling off and displacement of the orifice plate from the ink jet head main body are securely prevented.
These properties are particularly important to those ink jet......
- 16 - 2~
1 apparatuses which are provided with a device for restoring failure of ink discharge of an ink jet head.
The reason is that in such ink jet apparatuses wiping of the orifice part and aspiration through capping 5 around the orifice are carried out as described above and the force applied onto the orifice part or the entirety of the orifice plate at that time is especially large.
Claims (18)
1. A process for preparing an ink jet head, the head having a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening and an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said process comprising the steps of:
bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
2. The process according to claim 1, wherein said bonding step is performed before said pressurization step.
3. The process according to claim 2, further comprising a heating step of heating the plate member between said bonding step and said pressurization step.
4. The process according to claim 1, wherein said bonding step and said pressurization step are performed at the same time.
5. The process according to claim 1, wherein said discharge port forming step is performed by photolithography.
6. The process according to claim 1, wherein said discharge port forming step is performed by use of a laser beam.
7. The process according to claim 1, wherein the energy generating member comprises an electrothermal transducer which generates heat energy as the discharge energy.
8. An ink jet head including a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening and an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said head being formed by a process comprising the steps of:
bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
9. An ink jet apparatus including an ink jet head having a discharge port plate having a discharge port provided therethrough for discharging ink, and an ink jet head main body having an opening on a face of the main body, the opening provided corresponding to the discharge port, an ink pathway communicated to the opening and an energy generating member for generating energy to be utilized for discharging ink from the discharge port, wherein said main body is bonded to said discharge port plate, said head being formed by a process comprising the steps of:
bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
bonding a plate member which becomes the discharge port plate to the face of the ink jet head main body where the opening is provided;
applying a pressure on at least a portion of the plate member through which the discharge port is to be formed, the portion of the plate member being extruded into the opening of the main body; and forming the discharge port through the plate member which becomes the discharge port plate.
10. An ink jet apparatus according to claim 9 , further comprising:
wiping means for wiping a discharge port portion of said ink jet head.
wiping means for wiping a discharge port portion of said ink jet head.
11. An ink jet apparatus according to claim 9, further comprising:
capping means for capping said discharge port of said ink jet head.
capping means for capping said discharge port of said ink jet head.
12. An ink jet head comprising:
a discharge port plate through which a discharge port is formed for discharging ink; and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet head main body, the protrusion being effected by the application of pressure.
a discharge port plate through which a discharge port is formed for discharging ink; and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet head main body, the protrusion being effected by the application of pressure.
13. The ink jet head according to claim 12, wherein said discharge port plate is formed of an organic resin.
14. The ink jet head according to claim 13, wherein the organic resin has photosensitivity.
15. The ink jet head according to claim 12, wherein said energy generating member comprises electrothermal transducer which generates heat energy as the discharge energy.
16. An ink jet apparatus comprising:
an ink jet head including a discharge port plate through which a discharge port is formed for discharging ink, and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet head main body, the protrusion being effected by the application of pressure; and wiping means for wiping a discharge port portion of said ink jet head.
an ink jet head including a discharge port plate through which a discharge port is formed for discharging ink, and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet head main body, the protrusion being effected by the application of pressure; and wiping means for wiping a discharge port portion of said ink jet head.
17. An ink jet apparatus comprising an ink jet head including a discharge port plate through which a discharge port is formed for discharging ink and an ink jet head main body including an opening provided corresponding to said discharge port, an ink pathway communicated to said opening, and an energy generating member for generating energy to be utilized for discharging ink from said discharge port, said main body being bonded to said discharge port plate, wherein said discharge port plate is formed of a film, and at least a part of said discharge port plate, through which said discharge port is to be formed, protrudes into said opening of said ink jet main body, the protrusion being effected by the application of pressure; and capping means for capping said discharge port of said ink jet head.
18. A discharge port plate for an ink jet head having a discharge orifice, said discharge port plate comprising:
a discharge port portion having a discharge port provided therethrough for discharging ink; and a main body portion, wherein said main body portion of said plate being formed of a film, and said discharge port portion of said plate protruding from said main body portion upon the application of pressure for protrusion into the discharge orifice of the ink jet head.
a discharge port portion having a discharge port provided therethrough for discharging ink; and a main body portion, wherein said main body portion of said plate being formed of a film, and said discharge port portion of said plate protruding from said main body portion upon the application of pressure for protrusion into the discharge orifice of the ink jet head.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1025547A JPH02204048A (en) | 1989-02-03 | 1989-02-03 | Ink jet recording head and manufacture thereof |
| JP1-025547 | 1989-02-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2009230A1 CA2009230A1 (en) | 1990-08-03 |
| CA2009230C true CA2009230C (en) | 1994-07-26 |
Family
ID=12168998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002009230A Expired - Lifetime CA2009230C (en) | 1989-02-03 | 1990-02-02 | Ink jet head, method for preparing same, orifice plate for use in same and ink jet device equipped with same |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5059973A (en) |
| JP (1) | JPH02204048A (en) |
| CA (1) | CA2009230C (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682187A (en) * | 1988-10-31 | 1997-10-28 | Canon Kabushiki Kaisha | Method for manufacturing an ink jet head having a treated surface, ink jet head made thereby, and ink jet apparatus having such head |
| US5208604A (en) * | 1988-10-31 | 1993-05-04 | Canon Kabushiki Kaisha | Ink jet head and manufacturing method thereof, and ink jet apparatus with ink jet head |
| ES2069699T3 (en) * | 1989-09-18 | 1995-05-16 | Canon Kk | HEAD FOR PRINTING BY INKS, CARTRIDGE AND APPARATUS. |
| EP0419191B1 (en) * | 1989-09-18 | 1997-01-22 | Canon Kabushiki Kaisha | Liquid jet recording head and liquid jet recording apparatus having same |
| EP0468712B1 (en) * | 1990-07-21 | 1998-10-07 | Canon Kabushiki Kaisha | A method of manufacturing an ink jet head and an ink jet head |
| DE69219168T2 (en) * | 1991-01-18 | 1997-10-02 | Canon Kk | Ink jet unit with orifices and recording device using the same |
| JP3278186B2 (en) * | 1991-03-08 | 2002-04-30 | キヤノン株式会社 | Inkjet recording head |
| EP0585854B1 (en) * | 1992-08-31 | 1998-11-11 | Canon Kabushiki Kaisha | Ink jet head manufacturing method using ion machining and ink jet head manufactured thereby |
| JPH06246916A (en) * | 1993-02-26 | 1994-09-06 | Brother Ind Ltd | Ink jet device |
| US5604521A (en) * | 1994-06-30 | 1997-02-18 | Compaq Computer Corporation | Self-aligning orifice plate for ink jet printheads |
| JPH0952365A (en) * | 1995-06-08 | 1997-02-25 | Canon Inc | Ink jet recording head and manufacture thereof, and ink jet recording apparatus |
| US5901425A (en) | 1996-08-27 | 1999-05-11 | Topaz Technologies Inc. | Inkjet print head apparatus |
| US6474780B1 (en) | 1998-04-16 | 2002-11-05 | Canon Kabushiki Kaisha | Liquid discharge head, cartridge having such head, liquid discharge apparatus provided with such cartridge, and method for manufacturing liquid discharge heads |
| EP1020291A3 (en) | 1999-01-18 | 2001-04-11 | Canon Kabushiki Kaisha | Liquid discharge head and producing method therefor |
| US6745467B1 (en) | 1999-02-10 | 2004-06-08 | Canon Kabushiki Kaisha | Method of producing a liquid discharge head |
| US6447984B1 (en) * | 1999-02-10 | 2002-09-10 | Canon Kabushiki Kaisha | Liquid discharge head, method of manufacture therefor and liquid discharge recording apparatus |
| JP2000334952A (en) | 1999-05-27 | 2000-12-05 | Canon Inc | Liquid ejection head |
| JP2000334955A (en) | 1999-05-27 | 2000-12-05 | Canon Inc | Liquid ejection head, manufacture thereof and liquid ejection recorder employing it |
| US6652062B2 (en) * | 2000-03-31 | 2003-11-25 | Canon Kabushiki Kaisha | Liquid discharge recording head with orifice plate having extended portion fixed to recording head main body, liquid discharge recording apparatus having such head, and method for manufacturing such head |
| US7325309B2 (en) | 2004-06-08 | 2008-02-05 | Hewlett-Packard Development Company, L.P. | Method of manufacturing a fluid ejection device with a dry-film photo-resist layer |
| US7479203B2 (en) * | 2005-08-22 | 2009-01-20 | Lexmark International, Inc. | Lamination of dry film to micro-fluid ejection head substrates |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4057807A (en) * | 1976-01-15 | 1977-11-08 | Xerox Corporation | Separable liquid droplet instrument and magnetic drivers therefor |
| CA1127227A (en) * | 1977-10-03 | 1982-07-06 | Ichiro Endo | Liquid jet recording process and apparatus therefor |
| US4296421A (en) * | 1978-10-26 | 1981-10-20 | Canon Kabushiki Kaisha | Ink jet recording device using thermal propulsion and mechanical pressure changes |
| US4330787A (en) * | 1978-10-31 | 1982-05-18 | Canon Kabushiki Kaisha | Liquid jet recording device |
| US4345262A (en) * | 1979-02-19 | 1982-08-17 | Canon Kabushiki Kaisha | Ink jet recording method |
| US4463359A (en) * | 1979-04-02 | 1984-07-31 | Canon Kabushiki Kaisha | Droplet generating method and apparatus thereof |
| US4313124A (en) * | 1979-05-18 | 1982-01-26 | Canon Kabushiki Kaisha | Liquid jet recording process and liquid jet recording head |
| US4450455A (en) * | 1981-06-18 | 1984-05-22 | Canon Kabushiki Kaisha | Ink jet head |
| US4558333A (en) * | 1981-07-09 | 1985-12-10 | Canon Kabushiki Kaisha | Liquid jet recording head |
| JPS59123670A (en) * | 1982-12-28 | 1984-07-17 | Canon Inc | Ink jet head |
| JPS59138461A (en) * | 1983-01-28 | 1984-08-08 | Canon Inc | Liquid jet recording apparatus |
| JPS61230949A (en) * | 1985-04-08 | 1986-10-15 | Canon Inc | Ink jet recording apparatus |
| NL8501881A (en) * | 1985-07-01 | 1987-02-02 | Philips Nv | INK JET PRESSURE. |
| JPS62242546A (en) * | 1986-04-16 | 1987-10-23 | Ricoh Co Ltd | On-demand ink jet head and fitment for its production |
| US4894664A (en) * | 1986-04-28 | 1990-01-16 | Hewlett-Packard Company | Monolithic thermal ink jet printhead with integral nozzle and ink feed |
| US4723131A (en) * | 1986-09-12 | 1988-02-02 | Diagraph Corporation | Printhead for ink jet printing apparatus |
-
1989
- 1989-02-03 JP JP1025547A patent/JPH02204048A/en active Pending
-
1990
- 1990-02-02 US US07/473,824 patent/US5059973A/en not_active Expired - Lifetime
- 1990-02-02 CA CA002009230A patent/CA2009230C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US5059973A (en) | 1991-10-22 |
| JPH02204048A (en) | 1990-08-14 |
| CA2009230A1 (en) | 1990-08-03 |
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| EEER | Examination request | ||
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Effective date: 20121202 |