CA1193813A - Method and device for moulding a transparent object - Google Patents
Method and device for moulding a transparent objectInfo
- Publication number
- CA1193813A CA1193813A CA000421851A CA421851A CA1193813A CA 1193813 A CA1193813 A CA 1193813A CA 000421851 A CA000421851 A CA 000421851A CA 421851 A CA421851 A CA 421851A CA 1193813 A CA1193813 A CA 1193813A
- Authority
- CA
- Canada
- Prior art keywords
- moulding
- moulds
- radiation
- mould
- lens
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/0048—Moulds for lenses
- B29D11/005—Moulds for lenses having means for aligning the front and back moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/30—Mounting, exchanging or centering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/40—Product characteristics
- C03B2215/46—Lenses, e.g. bi-convex
- C03B2215/49—Complex forms not covered by groups C03B2215/47 or C03B2215/48
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/60—Aligning press die axes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S425/00—Plastic article or earthenware shaping or treating: apparatus
- Y10S425/808—Lens mold
Abstract
ABSTRACT:
Method and device for moulding a transparent object.
A method of and a device for the high-precision moulding of transparent objects is described. Before the object assumes its final shape a radiation beam is passed through the moulds of a moulding device and the material contained therein, and the intensity distribution of the radiation spot formed by this beam is compared with a reference, thereby enabling the moulds to be aligned very accurately, so that high-quality products can be manufactured.
Method and device for moulding a transparent object.
A method of and a device for the high-precision moulding of transparent objects is described. Before the object assumes its final shape a radiation beam is passed through the moulds of a moulding device and the material contained therein, and the intensity distribution of the radiation spot formed by this beam is compared with a reference, thereby enabling the moulds to be aligned very accurately, so that high-quality products can be manufactured.
Description
PT~ -10283 1 5.10~82 Method and device ~or moulding a transparent object.
The invention relates to a method ~or the high-precision moulding of a transparent objec-t, speci~ically a lens, in which a volume of a transparent material i9 introduce~ into a moulding device which is provided with at least one mould~ in order to ~e subjected -to a mould-ing process in said clevice. The invention also relates to a device for carrying ou-t the method and to an object manu~actured in accordance with the method, The transparent material may be a so~t glass which is transferred from a furnace to a space between two moulds of the moulding device, in which it is pressed in-to the desired shape. The material may alternatively be a plastics material which, in a sufficiently soft con~
dition, is in-troduced into the moulding device and is lS subsequently allowed to cure, for example under the ef-fect of thermal of ultra-violet radiation, or by cooling The entire object may be moulded from the plastics ma~
terial, using two moulds. Alternatively, a preform, for example a glass preform, may be used, on which one ~r two layers of a so~t plastics material are deposited~
All these processes are referred to hereinaf-ter as "moulding".
United States Patent Speci~ication no.
L~,166,088 describes a me-thod of manufacturing plastics lenses, using two moulds which are -transparent to the radia-tion, for example ultra-violet radiation, by means o:~ which the plastics is cured.
Especially with reference -to developments in the field of optical record carriers there is an in-creasing demand for lenses which comply with stringent specifications and which are nevertheless cheap. For in-scri'bing and/or reading an optical record carrier whose 8~3 pl-~ -10~83 2 5.10.82 inf`ormation carryiIlg elements have dimensions of the or-der o~ 1 /um or less , an objective is required which is capable of forming a radiation spot o:~ -the same order of Ill agnitude on the infornlation carrier. Instead of an ob-jective comprising a plurality of, for example four, se-parate lenses the use of an objective comprising only one lens is to be preferre~. However, such a lens should then have one or two aspheric surfaces. Such a lens can be provided by precision moulding or compression-moulding from glass or plastics. Stringent requirements are -to be set to -the dimensional accuracy of the lens and the sur-face quali-ty of the lens faces. In this respect precision is to be understood to mean that immediately after mould-ing or compression-moulding, i.e~ without a subsequent polisl1ing opera-tion, the lens does not depart by more thall, for example, 0.2 /um from the desired curvature at anS- point of the surface, whils-t the surface roughness ls less than, for example~ 0.02 /um.
As a result of the stringent requirements im posed on the lens rejects are more likely to occur. Such rejec-ts may be caused by an incorrect alignment of -the moulds. In the case of an incorrect alignment of the moulds the lens thus manufactured, or in general terms the objec-ts thus manufactured, will have an incorrect shape so that the desired optical function cannot be performed.
It is an object of the present invention to provide a method and device for manufacturing a trans-parent object ~hich yields a product which complies with very stringent requirements of accuracy and which, more specifically, are also suitable for manufacturing asphe-rical or other lenses which are dif~icult -to manufacture by other methods or devices.
The method according to the invention is char-ac-terized in that before the objec-t has assumed its final shape a radia-tion beam is passed through the mould-ing device filled with the transparent material, the in-~3i3~3 PT~ 102~3 3 5.10.82 tensity dis-tribution of a radiation spo-t formed in a plane of` observation by the emergent radiation beam is detected, and the positioning of the moulds is corrected so -that the intensity distribution is brought into con-S formity with a reference distribution.
The invention is based on the insight th~tthe shape of the obJect to be manufactured is already defined once the moulds of -the moulding device have been filled with -the transparent material. The optical beha-viour of the object to he manufactured is kno~n aftermeasuring the optical behaviour of the combination of -the moulds and the ma-terial present between these moulds.
As -this measurement is effected before the material has assumed its final shape, it :is possible to adapt the lS shape of the finished product by correcting the position and/or orientation of the noulds.
The device for carrying out the method in ac-cord~nce with the invention3 which device comprises a moulding device with at least one mould, is characterized in that at cne side of -the moulding device there is ar-ranged a radiation source which emits an alignment beam, in that the moulds which are used are transparent to the alignment beam, and in tha-t at the opposite side of the moulding device there is arranged an observation device for detecting the intensity distribution of the radiation spot formed by the alignment beam.
A first embodiment of the device i5 further characterized that the observation device comprises a ground-glass screen and a viewing device for the visual inspec-tion of -the radia-tion spot.
A second, preferred, embodiment of the device is characterized -in that the observation device comprisos a radiation-sensitive de-tection syst~?m which comprises a plurality of detector~, the outputs of said de-tectors being connected to -the separate inputs of an electronic prGcessing circuit for comparing the outpu-t signals with reference values ~tored in the processing circui-t and for ~3~3 p~T 10.~ 3 4 5.10.82 generating a con-trol signal for a mould~positioning ele-men-t. In this way the mould is aligned fully automatically.
A device including a second radiation source which produces a beam under the effec-t of which the -transparent material can be cured, i3 further characteriz-ed in that the last-mentioned beam has a wavelength which di~fers from that of the alignment beam and in that a wavelength-dependent beam-splitter is arranged in the radiation path before the moulding device.
Embodiments of the invention will now be described in more detail, by way of example, with refer-ence to -the drawing. In the drawing:
Figure 1 sho~s a known moulding device compris-ing two moulds, Figures 2a and 2b show examples of lenses fa-bricated by means of this moulding device, Figure 3 shows a first embodiment of a device in accordance with the inventiOn.
Figures 4a, 4b and 4c show different shapes of the radiation spot formed by the alignment beam employed in said device, Figure 5 shows a second embodiment of a device in accordance with the invention, Figure 6 represents the intensity distribution on -the radiation~sensitive detection system used in said device, Figure 7 shows a device in accordance with the invention for manufac-turing a meniscus lens, Figure 8 shows a triplet lens sys-tern manufactur-ed by means of a device in accordance with the invention, Figure 9 shows a diffraction gra-ting rnanufactur-ed with a device in accordance with the invention and, Figure 10 shows an assembly of a lens and a diffraction gra-ting manufactured by means of a device in accordance with the invention.
` Figure 1 schematically represents a moulding device 1 comprising two moulds 2 and 3. Between -these moulds and the bounding surfaces 6 and 7 w~ich latter may consti-tute a lens mount, a volume of a transparent material 10 used for manuacturing a lens 11, is pres-ent. The material for the lens may be a sof~ material which after curing forms a transparent plastics. ~uring or cross-linking of the material, specifically of the compounds contained therein, may be effected by heating or cooling or by means of radiation (12 in Eig. 1), specifically ultraviolet radiation. Suitable materials, or polymerizable substances, are specifically ultra-violet-curable acrylate-based monomers~
Alternatively, the moulding device may be a device or moulding glass or plastics, whose two moulds
The invention relates to a method ~or the high-precision moulding of a transparent objec-t, speci~ically a lens, in which a volume of a transparent material i9 introduce~ into a moulding device which is provided with at least one mould~ in order to ~e subjected -to a mould-ing process in said clevice. The invention also relates to a device for carrying ou-t the method and to an object manu~actured in accordance with the method, The transparent material may be a so~t glass which is transferred from a furnace to a space between two moulds of the moulding device, in which it is pressed in-to the desired shape. The material may alternatively be a plastics material which, in a sufficiently soft con~
dition, is in-troduced into the moulding device and is lS subsequently allowed to cure, for example under the ef-fect of thermal of ultra-violet radiation, or by cooling The entire object may be moulded from the plastics ma~
terial, using two moulds. Alternatively, a preform, for example a glass preform, may be used, on which one ~r two layers of a so~t plastics material are deposited~
All these processes are referred to hereinaf-ter as "moulding".
United States Patent Speci~ication no.
L~,166,088 describes a me-thod of manufacturing plastics lenses, using two moulds which are -transparent to the radia-tion, for example ultra-violet radiation, by means o:~ which the plastics is cured.
Especially with reference -to developments in the field of optical record carriers there is an in-creasing demand for lenses which comply with stringent specifications and which are nevertheless cheap. For in-scri'bing and/or reading an optical record carrier whose 8~3 pl-~ -10~83 2 5.10.82 inf`ormation carryiIlg elements have dimensions of the or-der o~ 1 /um or less , an objective is required which is capable of forming a radiation spot o:~ -the same order of Ill agnitude on the infornlation carrier. Instead of an ob-jective comprising a plurality of, for example four, se-parate lenses the use of an objective comprising only one lens is to be preferre~. However, such a lens should then have one or two aspheric surfaces. Such a lens can be provided by precision moulding or compression-moulding from glass or plastics. Stringent requirements are -to be set to -the dimensional accuracy of the lens and the sur-face quali-ty of the lens faces. In this respect precision is to be understood to mean that immediately after mould-ing or compression-moulding, i.e~ without a subsequent polisl1ing opera-tion, the lens does not depart by more thall, for example, 0.2 /um from the desired curvature at anS- point of the surface, whils-t the surface roughness ls less than, for example~ 0.02 /um.
As a result of the stringent requirements im posed on the lens rejects are more likely to occur. Such rejec-ts may be caused by an incorrect alignment of -the moulds. In the case of an incorrect alignment of the moulds the lens thus manufactured, or in general terms the objec-ts thus manufactured, will have an incorrect shape so that the desired optical function cannot be performed.
It is an object of the present invention to provide a method and device for manufacturing a trans-parent object ~hich yields a product which complies with very stringent requirements of accuracy and which, more specifically, are also suitable for manufacturing asphe-rical or other lenses which are dif~icult -to manufacture by other methods or devices.
The method according to the invention is char-ac-terized in that before the objec-t has assumed its final shape a radia-tion beam is passed through the mould-ing device filled with the transparent material, the in-~3i3~3 PT~ 102~3 3 5.10.82 tensity dis-tribution of a radiation spo-t formed in a plane of` observation by the emergent radiation beam is detected, and the positioning of the moulds is corrected so -that the intensity distribution is brought into con-S formity with a reference distribution.
The invention is based on the insight th~tthe shape of the obJect to be manufactured is already defined once the moulds of -the moulding device have been filled with -the transparent material. The optical beha-viour of the object to he manufactured is kno~n aftermeasuring the optical behaviour of the combination of -the moulds and the ma-terial present between these moulds.
As -this measurement is effected before the material has assumed its final shape, it :is possible to adapt the lS shape of the finished product by correcting the position and/or orientation of the noulds.
The device for carrying out the method in ac-cord~nce with the invention3 which device comprises a moulding device with at least one mould, is characterized in that at cne side of -the moulding device there is ar-ranged a radiation source which emits an alignment beam, in that the moulds which are used are transparent to the alignment beam, and in tha-t at the opposite side of the moulding device there is arranged an observation device for detecting the intensity distribution of the radiation spot formed by the alignment beam.
A first embodiment of the device i5 further characterized that the observation device comprises a ground-glass screen and a viewing device for the visual inspec-tion of -the radia-tion spot.
A second, preferred, embodiment of the device is characterized -in that the observation device comprisos a radiation-sensitive de-tection syst~?m which comprises a plurality of detector~, the outputs of said de-tectors being connected to -the separate inputs of an electronic prGcessing circuit for comparing the outpu-t signals with reference values ~tored in the processing circui-t and for ~3~3 p~T 10.~ 3 4 5.10.82 generating a con-trol signal for a mould~positioning ele-men-t. In this way the mould is aligned fully automatically.
A device including a second radiation source which produces a beam under the effec-t of which the -transparent material can be cured, i3 further characteriz-ed in that the last-mentioned beam has a wavelength which di~fers from that of the alignment beam and in that a wavelength-dependent beam-splitter is arranged in the radiation path before the moulding device.
Embodiments of the invention will now be described in more detail, by way of example, with refer-ence to -the drawing. In the drawing:
Figure 1 sho~s a known moulding device compris-ing two moulds, Figures 2a and 2b show examples of lenses fa-bricated by means of this moulding device, Figure 3 shows a first embodiment of a device in accordance with the inventiOn.
Figures 4a, 4b and 4c show different shapes of the radiation spot formed by the alignment beam employed in said device, Figure 5 shows a second embodiment of a device in accordance with the invention, Figure 6 represents the intensity distribution on -the radiation~sensitive detection system used in said device, Figure 7 shows a device in accordance with the invention for manufac-turing a meniscus lens, Figure 8 shows a triplet lens sys-tern manufactur-ed by means of a device in accordance with the invention, Figure 9 shows a diffraction gra-ting rnanufactur-ed with a device in accordance with the invention and, Figure 10 shows an assembly of a lens and a diffraction gra-ting manufactured by means of a device in accordance with the invention.
` Figure 1 schematically represents a moulding device 1 comprising two moulds 2 and 3. Between -these moulds and the bounding surfaces 6 and 7 w~ich latter may consti-tute a lens mount, a volume of a transparent material 10 used for manuacturing a lens 11, is pres-ent. The material for the lens may be a sof~ material which after curing forms a transparent plastics. ~uring or cross-linking of the material, specifically of the compounds contained therein, may be effected by heating or cooling or by means of radiation (12 in Eig. 1), specifically ultraviolet radiation. Suitable materials, or polymerizable substances, are specifically ultra-violet-curable acrylate-based monomers~
Alternatively, the moulding device may be a device or moulding glass or plastics, whose two moulds
2 and 3 are movable relative to each other in the direc-tion of the arrow 8. In that case Fig. 1 represents thesituation in which the moulds have reachea their final positions and the lens 11 has already been formed.
The method and device for ~he actual precis-ion-moulding process fall beyond the scope of the pres-ent invention and will not be discussed in more detail.For moulding lenses from a plastics ma~erial, reference is made, by way of example, to United States Pa~ent Specifications 4,113,224 and 4,166,088. For moulding glass lenses, specifically aspherical lenses, reference is made to Unlted Sta~es Patent Specification 3,306,723.
The lenses manufactured should have a high dimensional accuracy and a satisfactory surfaGe quality.
The desired surface quality~ for example a roughness of the order of 0 02 /um or less, can be obtained by means of a compression-moulding or other moulding process using the pre-stressed and rein~orced glass moulds developed by the Applicant and described in issued ~.S.
Patent 4,391,622 and European Patent 57,952~
The dimensional accuracy of the lens is deter-mined by the degree of alignment of the moulds 2 and 3 i38~3 during moulding. Fig. 1 represents the situation in whichthe moulds are correctly aligned relative to each other and the lens 11 thus manufactured has the desired shape.
If the moulds ar~ not correctly aligned the lens 11 may adopt the shape represented in Fig. 2a. In this Figure the axis of the mould 2 is designated a2 and that of ~he mould 3 is designated a3. The incorrect shape of the lens 11 in Fig. 2a is caused by the fact that during moulding the axes of the moulds were ~hifted by ~a as is indi~
cated in Fig. 2a. A different incorrect lens shape is obtained if the a~es of the moulds are tilted, as is represented in Fig. 2b by the angles aDc 2 and a C~3.
Finally, an error may occur in the spacing d between the moulds.
The said errors may be detected and corrected, as proposed by the present invention, by passing a radi-ation beam through the moulding device 1 and the material contained in said device and by determining the intensity distribution within the radiation spot formed by this radiation beam and comparing it with a reference. For this use is to be made of moulds which are transparent to the radiation of the alignment beam. Suitable moulds are for example those described in U.S. Patent 4,391,622 and European Patent 57,952.
Figure 3 represents a first embodiment of a device in accordance with the invention. The device com-prises a first radiation source 13, which emits an ultra-violet beam 12 for curing the photopolymerizable substance 10. A second radiation source 16, for example a ~IeNe laser, emits a second beam 17 by means of which the moulds 2 and
The method and device for ~he actual precis-ion-moulding process fall beyond the scope of the pres-ent invention and will not be discussed in more detail.For moulding lenses from a plastics ma~erial, reference is made, by way of example, to United States Pa~ent Specifications 4,113,224 and 4,166,088. For moulding glass lenses, specifically aspherical lenses, reference is made to Unlted Sta~es Patent Specification 3,306,723.
The lenses manufactured should have a high dimensional accuracy and a satisfactory surfaGe quality.
The desired surface quality~ for example a roughness of the order of 0 02 /um or less, can be obtained by means of a compression-moulding or other moulding process using the pre-stressed and rein~orced glass moulds developed by the Applicant and described in issued ~.S.
Patent 4,391,622 and European Patent 57,952~
The dimensional accuracy of the lens is deter-mined by the degree of alignment of the moulds 2 and 3 i38~3 during moulding. Fig. 1 represents the situation in whichthe moulds are correctly aligned relative to each other and the lens 11 thus manufactured has the desired shape.
If the moulds ar~ not correctly aligned the lens 11 may adopt the shape represented in Fig. 2a. In this Figure the axis of the mould 2 is designated a2 and that of ~he mould 3 is designated a3. The incorrect shape of the lens 11 in Fig. 2a is caused by the fact that during moulding the axes of the moulds were ~hifted by ~a as is indi~
cated in Fig. 2a. A different incorrect lens shape is obtained if the a~es of the moulds are tilted, as is represented in Fig. 2b by the angles aDc 2 and a C~3.
Finally, an error may occur in the spacing d between the moulds.
The said errors may be detected and corrected, as proposed by the present invention, by passing a radi-ation beam through the moulding device 1 and the material contained in said device and by determining the intensity distribution within the radiation spot formed by this radiation beam and comparing it with a reference. For this use is to be made of moulds which are transparent to the radiation of the alignment beam. Suitable moulds are for example those described in U.S. Patent 4,391,622 and European Patent 57,952.
Figure 3 represents a first embodiment of a device in accordance with the invention. The device com-prises a first radiation source 13, which emits an ultra-violet beam 12 for curing the photopolymerizable substance 10. A second radiation source 16, for example a ~IeNe laser, emits a second beam 17 by means of which the moulds 2 and
3 can be aligned. In the radiation path of the two beams there is arranged a prism 18 with a dichroic layer 19, which reflects the beam 12 almost completely and which 3~3~3 Pl-~ 102S3 7 5.10~8 tr~lsnlits the beam 17 substantially without atten-uation The alignment beam 17 traverses -the two no~lds 2 and 3 and the transparent Illateri~l 10 and is focussed by a lens 20 to form a radiationspot V. This radia-tion spot may be formed on the mat-t side 2Z of a ground-glass screen 21, whose o-ther side 63 is smoo-th and can be observed by means of a viewing device 64. Instead of a ground-glass screen and a viewing devica it is possible to employ a television camera-tube and moni-tor for observing the ra-diation spot V, The in-tensity distribution within the radiation spot depends on the distance ( ~ a in Fig, 2a) between the axes of the moulds" the oblique- position (~ ~ 2 and d ~ 3 in Fig. ~b) of the moulds, and the spacing (d) between the moulds. Figure 4a, 4b and !~c show e~amples of dif-ferent shapes the radiation spot V may have. ~ coma-like spot as represented by ~1 in Fig.~ 4a is formed if, for example, the a~es of the moulds are shif-ted relative to each other~
~hen, for example, a radia-tion spot llaving the shape of Fig. 4a is observed on thc screen 21 o~ Fig~ 3, the moulds 2 and 3 may be shifted and/or tilted until the radiation spot assumes -the shape ~ shown in Fig. 4b.
The axes of -the moulds are then correctly aligned and the noulds are not tilted; however~ the spacing between the moulds may then still differ from the desired value. Such a difference mani~ests i-'self as an error in the inten-sity distribu-tion within the circular radiation spot. The intensity distribu-tion may be detected visually or by means of a radiation-~sensitive detection systern and rnay be compared with a reference distribu-tion. For example by moving the mould 2 in the direction of the arrow 8 the actual intens-t~ distribution can be made identical -to the desired distribution~ Fig. 4c represents an intensity distribution which is obs~r~-ed in the case o~ a correct positioning of the moulds in a moulding device for the manllfacture of a di~fraction-limited lens. The r~diation ~ w P~ -IO-~S3 8 5.'l0.82 spot, a so-called Airy-spot, comprises a bright central por-tion CS and a plurality of concentric rings R1, R2, ... o~ decreasing intensity.
Fig. ~ represents an automated version of a device in accordhnce with the invention. Use is made of an inter~erometer arrangement in which a bec~n 17 which has passed -through -the rnoulding device and the ma-terial to be moulded is made to interfere wi-th a reference beam 23, This beam is obtained by splitting -the beam emitted by the source 16 by means of a beam-splitter prism 22.
The re~lection prisms 24 and 25 divert the re~erence beam around ~he moulding device and 1;he splitter prism 26 en-sures that a part of the referenc* beam is combined with the beam 17 emerging from the moulding device, The auxi-liary lens 2~ adapts the cross-section of -the beam 17 to that of the beam 23.
At the location of the interference pattern formed by the beams 17 and 23 a radiation-sensitive detec-tion system 2~ is arran~-ed. Fig. 6 is a front view of this detection system. It comprises a multitude of spaced de~
tectors 29, for example photo-diodes. The intensity dis-tribut:ion at the location of -the detection system 28 is designated I in Fig. 6. In the case of a cl~rrect po-sitioning of the moulds ~ and 3 the intensity distribu-tion I comprises a steep central peak P and a plurality of side-lobes L1, L2, ~O of lower intensity ~hich de-creases towards the outside, whils-t the pattern I is dis~
posed symmetrically relative to the detection system.
If the axes of the moulds 2 and 3 are shifted relative to each other the intensi-ty distribution di~fers ~rom the circularly symmetrical distribution represented by Figo 6. If the moulds are c~rrectly aligned but the spacing d between the mould~ is not correct, the central peak P of -the pattern I will be smaller and the side-lobes L1, L2, ... will be larger colnpared with the si-tuation represented in Fig. 6.
In order to determine the intl?nsity distribu-~J4' ~3~3 Pl.~ 1o~S3 9 5.10.82 tion over the detection sys-tem the individual outputs of the detec,;ors 29 are connected to separate inputs of an electronic device 30, which inter alia comprises a m~mory 31 and a comp~rator circuit 32. In this c:ircuit the out-put signal of each of the de-tectors 29 is compared with one of a plurality of reference ~ralues storad in the me-mory 31. The result of this comparison is processed to form a control sign~l Sc which is applied to devices for posi-tioning one of the moulds o~ both moulds in the direc--tions represented by the arrows 8, 8' and 21 in Fig. 5.
The positioning devices lie outside -the scope of the pre-sent invention and are only represented schematically by the hlock 3-.
~hen manufac-tur:ing opt:ical elements by means of polymerizable mate-rials it is not necessary, as al-ready stated, that the entire element should consist of such a material9 but use may be made of a glass preform, for example a lens. A comparatively thin layer of a poly-merizable liquid may be applied to one or both surfaces of this lens. Such a method has the advantage that a lens is pro~ided which for the greater part consists of a material having good optical properties, whilst the s-tringent requirements as regards the shape and surface quality of the lens surfaces can be met without an ex-pensive finishing operation, such as polishing. An exam-ple o~ an element that can be manufactured with advantage using the said method is a so-called meniscus lens. Such a lens is dif~icult to manufac-ture using conventional techniques owing to the stringent requirements imposed on dilnensiollal accuracy and thickness~ For exc~lple, both lens surfaces should be concentric rela-tive to a point on the op-tical axis.
Fig 7 schema-tically represents a device for forming a meniscus lens~ Again the alignment beam is designated 17 and the radiation beam used for polymeri-zation is designated 12. An optical shut-ter by means of which the beam 12 can be interrupted is designated 35.
PHN 10~83 lO 5. 10.82 The moulding device comprises one glass mould 41. The photo-polymerizable liquid 39 is applied between -this mould and a glass lens preform 37 which is retained by means of a fixture 36. The surface 38 of -the lens 37 has a centre of curvature ~3 and a radius of curvature R1.
The second surf`ace of the lens (37, 39) to be formed, which sur~ace coincides with the surface 4O of the mould 41, has a radius of curvature R2. Care must be taken -that the centre of curvature of the surface 4O coincides with the centre of curva-ture 43 of the surface 3S. For this purpose an alignmen-t beam 17, for example a He-Ne laser -beam is passed through the lens 37, the polymerizable liquid 39 and the mould 41, and the radiation spot formed by this beam is detected. Detection may be effected auto-matically, as described with reference to Fig. 5, or may be effected by visual observation using a ground-glass screen and a viewing device as shown in Fig. 7. By means of the information thus obtained the mould can be po-sitioned correctly using positioning me~ns, not shown, by a displacement in one or more of -the directions X, Y
and Z and/or tilting about the angles O and ~ .
Ins-tead of flat, the rear surface 42 of the mould may be curved, whilst the centre of curvature of the surface 42 may coincide with the cen-tre 43. The re fractive index n1 of -the lens 37 is, for example, equal -to the refractive index of the photo-polymerizable material 39. The refractive index n2 of -the mould 41 differs from n1, so that an image can be ~ormed.
The invention has been described with respect to the manufacture of a single lens, such as an aspherical lens, a cylindrical lens, a meniscus lens or a fresnel lens, but may also be used ~or the manufacture of a lens sys-tem, such as a so-called -triplet For this use can be made of a, for example glass, lens preform 5O as shown in Fig. 8. A layer 51 or 52 respectively of a polymeriz-able liquid may be applied to both surfaces of this lens.
After ali~nment the liquid is allowed -to cure, so that P~ 10283 11 5.-l0.82 the outermos-t lenses o~ the triplet are rormed, The in-vention may also be used ~or the manu~acture of other lens systems, such as a combination of spherical or a-spherical lenses and a cylindrical lens or a cornbination of a fresnel lens with other lens types.
The device may also be used ~or the manufacture of other optical elemen-ts, such as a prism or a di~frac-tion grating. Fig. 9 is a front view of ~uch a diffrac--tion grating 53. One o~ the moulds in the moulding de-vice in which the grating is formed has a pattern which is -the complement o~ the grating pattern to be ~ormed.
Before the grating is formed definitively, the position o~ the mould carrying the grating pattern may be checked by observing the dif~raction pattern of the beam which emerges ~rom the moulding device.
It is alternatively possible to manufacture a combination o~ a lens 55 and a diffraction grating 5~
in one process~ as is represented in Fig~ 10 D Before the ~ inal ~orma-tion of the composite element the alignment method described in the foregoing may be applied.
~hen, for example, a radia-tion spot llaving the shape of Fig. 4a is observed on thc screen 21 o~ Fig~ 3, the moulds 2 and 3 may be shifted and/or tilted until the radiation spot assumes -the shape ~ shown in Fig. 4b.
The axes of -the moulds are then correctly aligned and the noulds are not tilted; however~ the spacing between the moulds may then still differ from the desired value. Such a difference mani~ests i-'self as an error in the inten-sity distribu-tion within the circular radiation spot. The intensity distribu-tion may be detected visually or by means of a radiation-~sensitive detection systern and rnay be compared with a reference distribu-tion. For example by moving the mould 2 in the direction of the arrow 8 the actual intens-t~ distribution can be made identical -to the desired distribution~ Fig. 4c represents an intensity distribution which is obs~r~-ed in the case o~ a correct positioning of the moulds in a moulding device for the manllfacture of a di~fraction-limited lens. The r~diation ~ w P~ -IO-~S3 8 5.'l0.82 spot, a so-called Airy-spot, comprises a bright central por-tion CS and a plurality of concentric rings R1, R2, ... o~ decreasing intensity.
Fig. ~ represents an automated version of a device in accordhnce with the invention. Use is made of an inter~erometer arrangement in which a bec~n 17 which has passed -through -the rnoulding device and the ma-terial to be moulded is made to interfere wi-th a reference beam 23, This beam is obtained by splitting -the beam emitted by the source 16 by means of a beam-splitter prism 22.
The re~lection prisms 24 and 25 divert the re~erence beam around ~he moulding device and 1;he splitter prism 26 en-sures that a part of the referenc* beam is combined with the beam 17 emerging from the moulding device, The auxi-liary lens 2~ adapts the cross-section of -the beam 17 to that of the beam 23.
At the location of the interference pattern formed by the beams 17 and 23 a radiation-sensitive detec-tion system 2~ is arran~-ed. Fig. 6 is a front view of this detection system. It comprises a multitude of spaced de~
tectors 29, for example photo-diodes. The intensity dis-tribut:ion at the location of -the detection system 28 is designated I in Fig. 6. In the case of a cl~rrect po-sitioning of the moulds ~ and 3 the intensity distribu-tion I comprises a steep central peak P and a plurality of side-lobes L1, L2, ~O of lower intensity ~hich de-creases towards the outside, whils-t the pattern I is dis~
posed symmetrically relative to the detection system.
If the axes of the moulds 2 and 3 are shifted relative to each other the intensi-ty distribution di~fers ~rom the circularly symmetrical distribution represented by Figo 6. If the moulds are c~rrectly aligned but the spacing d between the mould~ is not correct, the central peak P of -the pattern I will be smaller and the side-lobes L1, L2, ... will be larger colnpared with the si-tuation represented in Fig. 6.
In order to determine the intl?nsity distribu-~J4' ~3~3 Pl.~ 1o~S3 9 5.10.82 tion over the detection sys-tem the individual outputs of the detec,;ors 29 are connected to separate inputs of an electronic device 30, which inter alia comprises a m~mory 31 and a comp~rator circuit 32. In this c:ircuit the out-put signal of each of the de-tectors 29 is compared with one of a plurality of reference ~ralues storad in the me-mory 31. The result of this comparison is processed to form a control sign~l Sc which is applied to devices for posi-tioning one of the moulds o~ both moulds in the direc--tions represented by the arrows 8, 8' and 21 in Fig. 5.
The positioning devices lie outside -the scope of the pre-sent invention and are only represented schematically by the hlock 3-.
~hen manufac-tur:ing opt:ical elements by means of polymerizable mate-rials it is not necessary, as al-ready stated, that the entire element should consist of such a material9 but use may be made of a glass preform, for example a lens. A comparatively thin layer of a poly-merizable liquid may be applied to one or both surfaces of this lens. Such a method has the advantage that a lens is pro~ided which for the greater part consists of a material having good optical properties, whilst the s-tringent requirements as regards the shape and surface quality of the lens surfaces can be met without an ex-pensive finishing operation, such as polishing. An exam-ple o~ an element that can be manufactured with advantage using the said method is a so-called meniscus lens. Such a lens is dif~icult to manufac-ture using conventional techniques owing to the stringent requirements imposed on dilnensiollal accuracy and thickness~ For exc~lple, both lens surfaces should be concentric rela-tive to a point on the op-tical axis.
Fig 7 schema-tically represents a device for forming a meniscus lens~ Again the alignment beam is designated 17 and the radiation beam used for polymeri-zation is designated 12. An optical shut-ter by means of which the beam 12 can be interrupted is designated 35.
PHN 10~83 lO 5. 10.82 The moulding device comprises one glass mould 41. The photo-polymerizable liquid 39 is applied between -this mould and a glass lens preform 37 which is retained by means of a fixture 36. The surface 38 of -the lens 37 has a centre of curvature ~3 and a radius of curvature R1.
The second surf`ace of the lens (37, 39) to be formed, which sur~ace coincides with the surface 4O of the mould 41, has a radius of curvature R2. Care must be taken -that the centre of curvature of the surface 4O coincides with the centre of curva-ture 43 of the surface 3S. For this purpose an alignmen-t beam 17, for example a He-Ne laser -beam is passed through the lens 37, the polymerizable liquid 39 and the mould 41, and the radiation spot formed by this beam is detected. Detection may be effected auto-matically, as described with reference to Fig. 5, or may be effected by visual observation using a ground-glass screen and a viewing device as shown in Fig. 7. By means of the information thus obtained the mould can be po-sitioned correctly using positioning me~ns, not shown, by a displacement in one or more of -the directions X, Y
and Z and/or tilting about the angles O and ~ .
Ins-tead of flat, the rear surface 42 of the mould may be curved, whilst the centre of curvature of the surface 42 may coincide with the cen-tre 43. The re fractive index n1 of -the lens 37 is, for example, equal -to the refractive index of the photo-polymerizable material 39. The refractive index n2 of -the mould 41 differs from n1, so that an image can be ~ormed.
The invention has been described with respect to the manufacture of a single lens, such as an aspherical lens, a cylindrical lens, a meniscus lens or a fresnel lens, but may also be used ~or the manufacture of a lens sys-tem, such as a so-called -triplet For this use can be made of a, for example glass, lens preform 5O as shown in Fig. 8. A layer 51 or 52 respectively of a polymeriz-able liquid may be applied to both surfaces of this lens.
After ali~nment the liquid is allowed -to cure, so that P~ 10283 11 5.-l0.82 the outermos-t lenses o~ the triplet are rormed, The in-vention may also be used ~or the manu~acture of other lens systems, such as a combination of spherical or a-spherical lenses and a cylindrical lens or a cornbination of a fresnel lens with other lens types.
The device may also be used ~or the manufacture of other optical elemen-ts, such as a prism or a di~frac-tion grating. Fig. 9 is a front view of ~uch a diffrac--tion grating 53. One o~ the moulds in the moulding de-vice in which the grating is formed has a pattern which is -the complement o~ the grating pattern to be ~ormed.
Before the grating is formed definitively, the position o~ the mould carrying the grating pattern may be checked by observing the dif~raction pattern of the beam which emerges ~rom the moulding device.
It is alternatively possible to manufacture a combination o~ a lens 55 and a diffraction grating 5~
in one process~ as is represented in Fig~ 10 D Before the ~ inal ~orma-tion of the composite element the alignment method described in the foregoing may be applied.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for the high-precision moulding of a transparent object, specifically a lens, in which a volume of a transparent material is introduced into a moulding device which is provided with at least one mould, in order to be subjected to a moulding process in said device, characterized in that before the object has assumed its final shape a radiation beam is passed through the mould-ing device filled with the transparent material, the inten-sity distribution of a radiation spot formed in a plane of observation by the emergent radiation beam is detected, and the positioning of the moulds is corrected so that the intensity distribution is brought into conformity with a reference distribution.
2. A method as claimed in Claim 1, a volume of soft and transparent material being transferred from a furnace to a space between two moulds of the moulding device and the transparent object being formed by compression.
3. A method as claimed in Claim 1, a volume of a curable synthetic substance being applied between two moulds of the moulding device and the transparent object being formed by curing.
4. A method as claimed in Claim 1, using a trans-parent preform, a volume of a liquid synthetic material being applied between said preform and at least one mould and the transparent object being formed by curing the synthetic material.
5. A device for carrying out the method as claimed in Claim 1, which device comprises a moulding device with at least one mould, characterized in that at one side of the moulding device there is arranged a radiation source which emits an alignment beam, the moulds which are used are transparent to the alignment beam, and at the opposite side of the moulding device there is arranged an observa-tion device for detecting the intensity distribution of the radiation spot formed by the alignment beam.
6. A device as claimed in Claim 5, characterized in that the observation device comprises a ground-glass screen and a viewing device.
7. A device as claimed in Claim 5, characterized in that the observation device comprises a radiation-sensitive detection system which comprises a plurality of separate detectors, the outputs of said detectors being connected to separate inputs of an electronic pro-cessing circuit for comparing the output signals with reference values stored in the processing circuit and for generating a control signal for a mould-positioning ele-ment.
8. A device as claimed in Claim 5, in which the transparent object is formed by curing a liquid synthetic material under the effect of radiation, characterized in that the radiation beam used for curing has a wavelength which differs from that of the alignment beam and a wave-length-dependent beam-splitter is arranged in the radi-ation path before the moulding device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8200634 | 1982-02-18 | ||
| NL8200634A NL8200634A (en) | 1982-02-18 | 1982-02-18 | METHOD AND APPARATUS FOR FORMING A TRANSPARENT ARTICLE |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1193813A true CA1193813A (en) | 1985-09-24 |
Family
ID=19839275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000421851A Expired CA1193813A (en) | 1982-02-18 | 1983-02-17 | Method and device for moulding a transparent object |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4440699A (en) |
| EP (1) | EP0087179B1 (en) |
| JP (1) | JPS58151221A (en) |
| AT (1) | ATE21970T1 (en) |
| CA (1) | CA1193813A (en) |
| DE (1) | DE3365756D1 (en) |
| NL (1) | NL8200634A (en) |
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-
1982
- 1982-02-18 NL NL8200634A patent/NL8200634A/en not_active Application Discontinuation
- 1982-05-24 US US06/381,114 patent/US4440699A/en not_active Expired - Fee Related
-
1983
- 1983-01-27 AT AT83200141T patent/ATE21970T1/en not_active IP Right Cessation
- 1983-01-27 DE DE8383200141T patent/DE3365756D1/en not_active Expired
- 1983-01-27 EP EP83200141A patent/EP0087179B1/en not_active Expired
- 1983-02-15 JP JP58022242A patent/JPS58151221A/en active Granted
- 1983-02-17 CA CA000421851A patent/CA1193813A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL8200634A (en) | 1983-09-16 |
| DE3365756D1 (en) | 1986-10-09 |
| ATE21970T1 (en) | 1986-09-15 |
| JPH024415B2 (en) | 1990-01-29 |
| US4440699A (en) | 1984-04-03 |
| EP0087179A1 (en) | 1983-08-31 |
| EP0087179B1 (en) | 1986-09-03 |
| JPS58151221A (en) | 1983-09-08 |
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| Date | Code | Title | Description |
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| MKEC | Expiry (correction) | ||
| MKEX | Expiry |