US3832718A - Non-impact, curie point printer - Google Patents
Non-impact, curie point printer Download PDFInfo
- Publication number
- US3832718A US3832718A US00325064A US32506473A US3832718A US 3832718 A US3832718 A US 3832718A US 00325064 A US00325064 A US 00325064A US 32506473 A US32506473 A US 32506473A US 3832718 A US3832718 A US 3832718A
- Authority
- US
- United States
- Prior art keywords
- magnetic
- printer
- set forth
- impact
- light beam
- 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
Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G19/00—Processes using magnetic patterns; Apparatus therefor, i.e. magnetography
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/14—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by electrographic printing, e.g. xerography; by magnetographic printing
Definitions
- the copier be capable of reproducing a gray scale, reproduce large dark areas, and have good resolution.
- the copier be insensitive to ambient conditions, e.g., humidity, and that the copier work equally well with remote image sources.
- Prior art copiers while quite good in some of these respects, do not fulfill all of them to the same degree.
- Another object of the present invention is to provide an improved non-impact printer for alphanumerical characters and facsimile.
- a further object of the present invention is to provide a high speed printer utilizing Curie point writing.
- Another object of the present invention is to provide an on-line printer for computers and terminals.
- thermomagnetic material imaged with the information to be printed.
- the imaging selectively heats the material above its Curie temperature. When allowed to cool in a small magnetic field, the information is recorded.
- the drum is then inked with a suitable magnetic ink that adheres only to the magnetized areas. Printing then transfers the magnetic ink to the paper. Imaging is carried out by selective heating with a laser utilizing an aperture disc and a scanningmirror.
- F IG. 1 illustrates a preferred embodiment of the present invention.
- FIG. 2a illustrates one form of aperture disc suitable for use in the present invention.
- FIG. 2b illustrates another form of aperture disc suitable for use in the present invention.
- FIG. 3 illustrates the printing operation in accordance withthe present invention.
- F IG.- 1 illustrates a preferred embodiment'of the recording portion of the present invention in which the characters to be printedare recorded on a drum coated with thermomagnetic material.
- the recording portion of the preferred embodiment generally comprises the recording drum, suitable optics for recording on the 2 drum, and electronics for controlling the pattern of the beam incident upon the drum.
- recorder 10- comprises drum 1] having a thermomagnetic coating 12 thereon.
- Drum 11 rotates on axis 13 and is driven by any suitable driving'mechanism.
- Adjacent drum 11 is a second drum 14 having thereon a single turn helical mirror 15.
- Helical mirror 15 is rotated about its axis 16 by any suitable driving mechanism and is preferably mechanically coupled to drum II to provide synchronization.
- a continuously running laser 17 provides a beam 18 that is reflected by helical mirror 15 onto a selected spot 19 on the thermomagnetic coating of drum 11.
- the laser beam passes through beam splitting mirror 20, optical gate 21, and mask wheel 22 on its way to spot 19.
- Beam splitting mirror 20 provides a small secondary beam which also passes through mask wheel 22 and is detected by detector 23.
- the output from detector 23 is applied as one input to comparator 24.
- the other input, input 25, is provided by a remote source and comprises a coded signal to be compared with the signal from detector 23.
- comparator 24 Upon the matching of the information at each input, comparator 24 produces an output signal which is appliedto gate 21 to enable optical gate 21 to transmit beam 18.
- mask wheel 22 would preferably comprise at least one pair of tracks wherein one track comprises a plurality of translucent areas 31, illustrated in FIG. 2 and 2a as a plurality of openings forming teeth about the periphery of mask wheel 22, and a second track 32 comprising alphanumerical characters, wherein a code, for example, binary code, corresponding to each letter is carried on the periphery of mask wheel 22 in a position corresponding to the appropriate alphanumerical character.
- an input signal from the computer would be received at input 25 and applied to comparator 24.
- This coded signal is compared with the output signal from detector 23, which preferably comprises a photocell detector.
- comparator 24 produces an output signal to. gate 21 thereby opening gate 21 and allowing laser beam 18 to pass therethrough and through the alphanumerical portion of mask wheel 22.
- the particular alphanumerical character through which the laser beam passes effectively shapes the pattern of the beam by shaping the beam in the form of the particular alphanumerical character.
- This beam is then reflected by helical mirror 15 to a predetermined point 19 on drum 11.
- the laser beam serves to heat portion 19 above the Curie temperature of the thermomagnetic coating. By allowing the portion to cool in the presence of a small magnetic field, the information is thus magnetically recorded on recording 12.
- the small magnetic field can be provided a number of ways.
- magnetic field 27 is provided by permanent magnets 28 and 29, the spacing of which provides a slitthrough which beam 18 passes.
- Magnets 28 and 29 are preferably magnetized in the direction illustrated, but may also be magnetized in the perpendicular directions which would produce a fringe fieldintersecting the surface of drum 11.
- D.C. electromagnets may be used.
- Helical mirror is rotated faster than drum 11 so that one complete turn of helical mirror 15 scans one line on drum 11. If desired, so that the printed line is parallel to the axis of the drum, axes 13 and 16 can be made slightly skew to one another so that as drum 11 rotates slowly a straight line is scanned thereacross. Alternatively, drum 11.can be started and stopped.
- thermomagnetic coating on drum 11 may comprise any suitable material having a Curie temperature between 30and 150 C.
- suitable material is disclosed in copending application Ser. No.
- This material substituted cobalt ferrite, has a Curie temperature that can be varied within these limits.
- An example of a suitable ferrite is CoGa Fe 0, having a Curie temperature of 150 C.
- the particular Curie temperature chosen is determined in part by the beam power available from laser 17 and the length of time the laser beam is permitted to irradiate a particular location.
- the thermomagnetic material used in a particular application is chosen consistent with the thermal energy available.
- the remanent magnetization at the ambient temperature decreases with decreasing Curie temperature.
- the speed with which the magnetic latent image can be produced depends on the power required to reach the Curie temperature.
- An easily accessable value for Curie temperature is between 75and 150 C. In this range, flash tubes and incandescent sources can be used as well as the laser as illustrated in FIG. 1.
- Detector 23 could also, for example, comprise a magnetic detector sensitive to amagnetized code in one track of mask wheel 22. Alternatively, reflection from light and dark areas in a track on mask wheel 22 could be used as the coding element. Detector 23 would then be positioned to detect reflections from the surface of mask wheel 22 rather than transmission through translucent areas.
- Gate 21 may comprise any suitable mechanism for controlling the beam of laser 17.
- One suitable gate is produced by the Isomet Corporation of New Jersey.
- Laser 17 may comprise any suitable laser, for example, a helium-neon laser.
- FIG. 3 illustrates the printing of the recorded information in accordance with the present invention.
- a magneticbrush 33 is used to transfer magnetic ink 30 to the surface of the drum where it adheres only to the areas magnetized during the recording operation.
- Magnetic brush 33 preferably comprises a magnet within a rotating drum for attracting a magnetic core particle of the magnetic ink and transferring the ink to drum 11.
- the magnetic ink may comprise either magnetically soft or hard particles coated with a low melting point resin.
- 10 micron diameter ferrite particles having a resin coating comprising percent polyvinylbutyral, 70 percent rosin-modified phenolformaldehide and 5 percent carbon black are suitable as a magnetic ink.
- the magnetic ink adheres to theimaged portions of characters can be recorded on drum 11.
- mask wheel 22 contains the whole alphanumerical character in a first track and a coded second track.
- the second is where the character is built up by a plurality of dots in a matrix.
- the alphanumerical characters in track 32 are replaced with holes of varying size, as in track 32.
- the digital code in track 31 is used to select the proper diameter hole and hence the density of the dot being formed.
- An alternative embodiment of the present invention when used for facsimile, does not utilize mask wheel 22, detector 23 or comparator 24.
- the input signal to input terminals 25 is a coded signal indicating the reflectance of the document (gray scale) being transmitted from a remote source.
- Comparator 24 is replaced with a decoding circuit which decodes the input signal and opens gate 21 for a time inversely proportional to the reflectance of the document. The longer time allows a greater spread of the heat on the thermomagnetic material and thus produces a darker image.
- non-impact magnetic printer which can be used for both non-impact printing and hard copy duplications.
- the use of continuously rotating drums obviates the need for any reciprocal motion and enables high speed operation.
- a printer of 132 characters per line, 13,600 lines per minute is attainable.
- the use of magnetic rather than electrostatic effects enables the printer to be less sensitive to ambient conditions.
- a non-impact magnetic printer comprising:
- thermomagnetic material a first rotatable cylinder coated with thermomagnetic material
- light source means producing a light beam for locally heating portions of said material
- magnetic means adjacent said cylinder for producing a local magnetic field in said heated portions; mirror means for deflecting the light beam to selected portions of said material;
- mask wheel means interposed in the beam path between said light source means and said mirror means, for shaping the pattern of the beam incident upon said material
- thermomagnetic inking means for transferring magnetic ink to the surface of said thermomagnetic material.
- a second rotatable cylinder having a single turn, helical mirror wound thereon, the axes of said first and second rotatable cylinders being approximately parallel.
- detecting means for detecting the code designation in said second track and producing an output signal indicative thereof
- comparator means for comparing input information indicative of a particular pattern with the output signal from said detecting means and producing a control output signal
- gate means interposed in said beam path between said light source means and said mask wheel means, for permitting the light beam to pass therethrough in response to said control signal.
- a non-impact magnetic printer as set forth in claim 5 wherein said patterns comprise alphanumerical characters.
- a facsimile printer comprising:
- light source means producing a light beam for locally heating portions of said material; magnetic means adjacent said cylinder for producing a local magnetic field in said heated portions; mirror means for deflecting the light beam to selected portions of said material; optical gate means interposed in the beam path between said light source means and said mirror means; decoder means receiving a coded input signal indicative of the reflectance of a spot being scanned, said decoder means producing a time control output signal for controlling the length of time said gate means transmits said light beam; inking means for coating the magnetized portions of said material with a magnetic ink; and paper press means for guiding paper against said cylinder to transfer the magnetically stored image to said paper.
Abstract
Description
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00325064A US3832718A (en) | 1973-01-19 | 1973-01-19 | Non-impact, curie point printer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00325064A US3832718A (en) | 1973-01-19 | 1973-01-19 | Non-impact, curie point printer |
Publications (1)
Publication Number | Publication Date |
---|---|
US3832718A true US3832718A (en) | 1974-08-27 |
Family
ID=23266287
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00325064A Expired - Lifetime US3832718A (en) | 1973-01-19 | 1973-01-19 | Non-impact, curie point printer |
Country Status (1)
Country | Link |
---|---|
US (1) | US3832718A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4122455A (en) * | 1975-01-28 | 1978-10-24 | Sidney Levy | Magnetic imaging for photocopying |
US4131782A (en) * | 1976-05-03 | 1978-12-26 | Lasag Ag | Method of and apparatus for machining large numbers of holes of precisely controlled size by coherent radiation |
US4314257A (en) * | 1979-03-16 | 1982-02-02 | Hitachi, Ltd. | Thermomagnetic recording apparatus |
DE3231980A1 (en) * | 1981-08-28 | 1983-03-10 | Fuji Xerox Co., Ltd., Tokyo | METHOD FOR DELETING A LATENT MAGNETIC IMAGE IN A THERMOMAGNETIC RECORDING CARRIER |
US4833990A (en) * | 1986-10-03 | 1989-05-30 | Man Technologie Gmbh | Printing press for modifying hydrophobic and hydrophilic areas of a printing image carrier |
DE4133305A1 (en) * | 1991-10-08 | 1993-04-15 | Zweckform Buero Prod Gmbh | DEVICE FOR GUIDING A LASER BEAM |
US5339737A (en) * | 1992-07-20 | 1994-08-23 | Presstek, Inc. | Lithographic printing plates for use with laser-discharge imaging apparatus |
US5351617A (en) * | 1992-07-20 | 1994-10-04 | Presstek, Inc. | Method for laser-discharge imaging a printing plate |
US5353705A (en) * | 1992-07-20 | 1994-10-11 | Presstek, Inc. | Lithographic printing members having secondary ablation layers for use with laser-discharge imaging apparatus |
US5379698A (en) * | 1992-07-20 | 1995-01-10 | Presstek, Inc. | Lithographic printing members for use with laser-discharge imaging |
US5385092A (en) * | 1992-07-20 | 1995-01-31 | Presstek, Inc. | Laser-driven method and apparatus for lithographic imaging |
USRE35512E (en) * | 1992-07-20 | 1997-05-20 | Presstek, Inc. | Lithographic printing members for use with laser-discharge imaging |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3474457A (en) * | 1967-11-13 | 1969-10-21 | Precision Instr Co | Laser recording apparatus |
US3570380A (en) * | 1968-06-07 | 1971-03-16 | Olivetti & Co Spa | Impactless typewriter |
US3611415A (en) * | 1968-04-25 | 1971-10-05 | Magnavox Co | Flatbed thermomagnetic facsimile system |
US3729248A (en) * | 1970-06-26 | 1973-04-24 | Cit Alcatel | Optical scanning assembly with helical-shaped rotating reflector |
US3751587A (en) * | 1972-01-20 | 1973-08-07 | Saxon Ind Inc | Laser printing system |
-
1973
- 1973-01-19 US US00325064A patent/US3832718A/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3474457A (en) * | 1967-11-13 | 1969-10-21 | Precision Instr Co | Laser recording apparatus |
US3611415A (en) * | 1968-04-25 | 1971-10-05 | Magnavox Co | Flatbed thermomagnetic facsimile system |
US3570380A (en) * | 1968-06-07 | 1971-03-16 | Olivetti & Co Spa | Impactless typewriter |
US3729248A (en) * | 1970-06-26 | 1973-04-24 | Cit Alcatel | Optical scanning assembly with helical-shaped rotating reflector |
US3751587A (en) * | 1972-01-20 | 1973-08-07 | Saxon Ind Inc | Laser printing system |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4122455A (en) * | 1975-01-28 | 1978-10-24 | Sidney Levy | Magnetic imaging for photocopying |
US4131782A (en) * | 1976-05-03 | 1978-12-26 | Lasag Ag | Method of and apparatus for machining large numbers of holes of precisely controlled size by coherent radiation |
US4314257A (en) * | 1979-03-16 | 1982-02-02 | Hitachi, Ltd. | Thermomagnetic recording apparatus |
DE3231980A1 (en) * | 1981-08-28 | 1983-03-10 | Fuji Xerox Co., Ltd., Tokyo | METHOD FOR DELETING A LATENT MAGNETIC IMAGE IN A THERMOMAGNETIC RECORDING CARRIER |
US4503438A (en) * | 1981-08-28 | 1985-03-05 | Fuji Xerox Co., Ltd. | Method of erasing magnetic latent image in thermo-magnetic recording |
US4833990A (en) * | 1986-10-03 | 1989-05-30 | Man Technologie Gmbh | Printing press for modifying hydrophobic and hydrophilic areas of a printing image carrier |
DE4133305A1 (en) * | 1991-10-08 | 1993-04-15 | Zweckform Buero Prod Gmbh | DEVICE FOR GUIDING A LASER BEAM |
EP0536683B1 (en) * | 1991-10-08 | 1996-08-28 | Zweckform Büro-Produkte GmbH | Apparatus for guiding a laser beam |
US5339737A (en) * | 1992-07-20 | 1994-08-23 | Presstek, Inc. | Lithographic printing plates for use with laser-discharge imaging apparatus |
US5351617A (en) * | 1992-07-20 | 1994-10-04 | Presstek, Inc. | Method for laser-discharge imaging a printing plate |
US5353705A (en) * | 1992-07-20 | 1994-10-11 | Presstek, Inc. | Lithographic printing members having secondary ablation layers for use with laser-discharge imaging apparatus |
US5379698A (en) * | 1992-07-20 | 1995-01-10 | Presstek, Inc. | Lithographic printing members for use with laser-discharge imaging |
US5385092A (en) * | 1992-07-20 | 1995-01-31 | Presstek, Inc. | Laser-driven method and apparatus for lithographic imaging |
USRE35512E (en) * | 1992-07-20 | 1997-05-20 | Presstek, Inc. | Lithographic printing members for use with laser-discharge imaging |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3832718A (en) | Non-impact, curie point printer | |
US5414262A (en) | Imaging device and method for developing, duplicating and printing graphic media | |
US4072957A (en) | Non-impact printing system with magnetic recording apparatus and method | |
US3261284A (en) | Non-impact electrostatic printer | |
US4015081A (en) | Multifunction scanning system | |
US5146242A (en) | Writing beam angular alignment device | |
JPH06191064A (en) | Thermal image forming method and device therefor | |
US3735416A (en) | Magnetic printing system | |
CN100355586C (en) | Image forming device, image forming unit and image forming method | |
US4969013A (en) | Apparatus and method for digitizing a document for selective area treatment | |
US5146241A (en) | Automatic cut-out for auto-focus device | |
US4928118A (en) | Enhanced resolution electrophotographic-type imaging station | |
US3811766A (en) | Developing apparatus | |
US3693183A (en) | Magnetic printing utilizing thermal gradients | |
JP3142075B2 (en) | A fraud prevention method that makes it readable by the MICR reader and makes forgery difficult | |
US5083157A (en) | Application of MICR media to xerographic images | |
GB1572656A (en) | Magnetic latent image creation | |
EP0033025A2 (en) | Printing apparatus | |
US3176307A (en) | Method of and apparatus for electrostatic recording | |
US3686676A (en) | Dual mode electrographic recorder | |
US4030105A (en) | Technique of character generation on magnetic tapes | |
US4459598A (en) | Image recording method | |
US4395470A (en) | Process of forming magnetic latent images | |
US4606610A (en) | Imaging system using tellurium-based energy sensitive sheet and variable image displaying means | |
US4392754A (en) | Magnetic dot matrix printing method and apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENICOM CORPORATION THE, A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. SUBJECT TO LICENSE RECITED.;ASSIGNOR:GENERAL ELECTRIC COMPANY A NY CORP.;REEL/FRAME:004204/0184 Effective date: 19831021 Owner name: GENICOM CORPORATION THE,, STATELESS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GENERAL ELECTRIC COMPANY A NY CORP.;REEL/FRAME:004204/0184 Effective date: 19831021 |
|
AS | Assignment |
Owner name: ARCO CHEMICAL TECHNOLOGY, INC., A CORP. OF DE, DEL Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ARCO CHEMICAL COMPANY;REEL/FRAME:005010/0113 Effective date: 19880831 |
|
AS | Assignment |
Owner name: CHEMICAL BANK, A NY BANKING CORP., NEW YORK Free format text: SECURITY INTEREST;ASSIGNOR:GENICOM CORPORATION, A CORP. OF DE.;REEL/FRAME:005370/0360 Effective date: 19900427 |
|
AS | Assignment |
Owner name: FIDELCOR BUSINESS CREDIT CORPORATION, 810 SEVENTH Free format text: SECURITY INTEREST;ASSIGNOR:GENICOM CORPORATION;REEL/FRAME:005521/0609 Effective date: 19900925 Owner name: GENICOM CORPORATION, GENICOM DRIVE, WAYNESBORO, VA Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHEMICAL BANK;REEL/FRAME:005521/0662 Effective date: 19900926 |