GB582248A - Improvements in the moulding of optical elements from synthetic resins - Google Patents
Improvements in the moulding of optical elements from synthetic resinsInfo
- Publication number
- GB582248A GB582248A GB2073/44A GB207344A GB582248A GB 582248 A GB582248 A GB 582248A GB 2073/44 A GB2073/44 A GB 2073/44A GB 207344 A GB207344 A GB 207344A GB 582248 A GB582248 A GB 582248A
- Authority
- GB
- United Kingdom
- Prior art keywords
- syrup
- preform
- mould
- film
- polymerized
- 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
- B29D11/00865—Applying coatings; tinting; colouring
-
- 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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/18—Slush casting, i.e. pouring moulding material into a hollow mould with excess material being poured off
-
- 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
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/70—Completely encapsulating inserts
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
Abstract
A preform of thermoplastic synthetic resin is made (or selected) having a certain accuracy of shape, and between the surface of the preform and the surface of a mould also having a certain accuracy of shape is trapped a film of syrup composed essentially of one or more liquid polymerisable organic compounds having one or more CH2=C< groups per molecule, the syrup being capable of dissolving and/or swelling the surface of the preform. The film of syrup is then polymerized by heat and/or light at a temperature insufficient to cause the formation of bubbles. The syrup may contain dissolved organic polymerized compounds containing one or more CH2=C< groups per molecule, plasticizers, dyes, polymerization catalysts and (if transparent films are not required) fillers and inorganic pigments. The syrup liquid may be methyl methacrylate, styrene, allyl methacrylate or diallyl fumarate, the two last-named being preferably in admixture with methyl methacrylate. The dissolved polymer may be polymethyl methacrylate. Lenses, prisms, mirrors, flats, and reflecting gratings may be made. In setting up the mould, a drop of the syrup is placed in the bottom part of the mould, the preform (of polymethyl methacrylate or polystyrene, cast, cut, ground or press-moulded, and preferably having been freed from internal stresses by annealing in an inert liquid as described in Specification 580,855) is placed on the drop, another drop is placed on the preform, and the top of the mould is placed in position. The whole is then allowed to stand for 1/4 hour under non-polymerizing conditions, and then the film is polymerized by heat and/or light. The formation of bubbles in the film may be minimized by the application of pressure to the mould, e.g. in an autoclave. As the syrup film polymerizes and p contracts, there is a tendency for air to be drawn into the edges of the film; this can be overcome by making the mould surfaces larger than the preform surfaces, so that syrup, not air, is sucked in. The refractive index of the film may be the same as or different from that of the preform.ALSO:A preform of thermoplastic synthetic resin is made (or selected) having a certain accuracy of shape, and between the surface of the preform and the surface of a mould also having a certain accuracy of shape is trapped a film of syrup composed essentially of one or more liquid polymerizable organic compounds having one or more CH2=C< groups per molecule, the syrup being capable of dissolving and/or swelling the surface of the preform. The film of syrup is then polymerized by heat and/or light at a temperature insufficient to cause the formation of bubbles. The syrup may contain dissolved organic polymerized compounds containing one or more CH2=C< groups per molecule, plasticizers, dyes, polmerization catalysts and (if transparent films are not required) fillers and inorganic pigments. The accuracy of shape of the preform must conform to the equation:- Maximum variation from the ideal surface in the preform of the dimension to be corrected (in degrees, inches &c.} = {Maximum variation from the ideal surface in the finished optical element of the same dimension (in degrees, inches &c.)} X dp/dp-ds where dp is the density of the polymer produced from the syrup and ds is the density of the syrup. Thus, if the syrup has a density of 1.027 and the polymer produced from the syrup has a density of 1.189, and it is desired to produce a prism having the angle between a pair of faces correct to within plus or minus 40 seconds, the maximum permissible variation in the corresponding angle in the preform is 40 seconds x 1.189/1.189-1.027 i.e., 294 seconds. The accuracy of the shape of the mould must be such that its deviation from the ideal surface is negligible compared with the deviation of the preform from the ideal surface. The syrup liquid may be methyl methacrylate, styrene, allyl methacrylate or diallyl fumarate, the two last-named being preferably in admixture with methyl methacrylate. The dissolved polymer may be polymethyl methacrylate. Lenses, prisms, mirrors, flats, and reflecting gratings may be made. In setting up the mould, a drop of the syrup is placed in the bottom part of the mould, the preform (of polymethyl methacrylate or polystyrene, cast, cut, ground or press-moulded, and preferably having been freed from internal stresses by annealing in an inert liquid as described in Specification 580,855, [Group IV], is placed on the drop, another drop is placed on the preform, and the top of the mould is placed in position. The whole is then allowed to stand for 1/4 hour under non-polymerizing conditions, and then the film is polymerized by heat and/or light. The mould may be of glass, steel or soft metal coated with hard metal, and may be lubricated. The formation of bubbles in the film may be minimized by the application of pressure to the mould, e.g., in an autoclave. As the syrup film polymerizes and contracts, there is a tendency for air to be drawn into the edges of the film; this can be overcome by making the mould surfaces larger than the preform surfaces, so that syrup, not air, is sucked in. The refractive index of the film may be the same as or different from that of the preform. Specifications 482,836; 567,777 and 567,778, [both in Group IV], also are referred to.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2073/44A GB582248A (en) | 1944-02-04 | 1944-02-04 | Improvements in the moulding of optical elements from synthetic resins |
BE466276A BE466276A (en) | 1944-02-04 | 1946-06-27 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2073/44A GB582248A (en) | 1944-02-04 | 1944-02-04 | Improvements in the moulding of optical elements from synthetic resins |
Publications (1)
Publication Number | Publication Date |
---|---|
GB582248A true GB582248A (en) | 1946-11-11 |
Family
ID=9733107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2073/44A Expired GB582248A (en) | 1944-02-04 | 1944-02-04 | Improvements in the moulding of optical elements from synthetic resins |
Country Status (2)
Country | Link |
---|---|
BE (1) | BE466276A (en) |
GB (1) | GB582248A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3402004A (en) * | 1964-10-12 | 1968-09-17 | Nelmor Corp | Prismatic mirror |
WO1994014586A1 (en) * | 1992-12-23 | 1994-07-07 | Honeywell Inc. | Replication of optically flat surfaces |
US5642228A (en) * | 1993-12-21 | 1997-06-24 | Koito Manufacturing Co., Ltd. | Resin-molded lens having no sink marks and process for producing same |
WO2007085910A2 (en) * | 2005-12-21 | 2007-08-02 | Essilor International (Compagnie Générale d'Optique) | A method for coating an ophthalmic lens within an injection molding machine |
WO2013164055A1 (en) * | 2012-05-02 | 2013-11-07 | Heraeus Noblelight Gmbh | Method for producing an optical module having a polymer lens, optical module and use thereof |
-
1944
- 1944-02-04 GB GB2073/44A patent/GB582248A/en not_active Expired
-
1946
- 1946-06-27 BE BE466276A patent/BE466276A/fr unknown
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3402004A (en) * | 1964-10-12 | 1968-09-17 | Nelmor Corp | Prismatic mirror |
WO1994014586A1 (en) * | 1992-12-23 | 1994-07-07 | Honeywell Inc. | Replication of optically flat surfaces |
US5624611A (en) * | 1992-12-23 | 1997-04-29 | Honeywell Inc. | Replication of optically flat surfaces |
US5642228A (en) * | 1993-12-21 | 1997-06-24 | Koito Manufacturing Co., Ltd. | Resin-molded lens having no sink marks and process for producing same |
WO2007085910A2 (en) * | 2005-12-21 | 2007-08-02 | Essilor International (Compagnie Générale d'Optique) | A method for coating an ophthalmic lens within an injection molding machine |
WO2007085910A3 (en) * | 2005-12-21 | 2007-11-29 | Essilor Int | A method for coating an ophthalmic lens within an injection molding machine |
CN101321616A (en) * | 2005-12-21 | 2008-12-10 | 埃西勒国际通用光学公司 | Method for coating an ophthalmic lens within an injection molding machine |
AU2006336869B2 (en) * | 2005-12-21 | 2010-07-01 | Essilor International | A method for coating an ophthalmic lens within an injection molding machine |
US7833442B2 (en) | 2005-12-21 | 2010-11-16 | Essilor International (Compagnie Generale D'optique) | Method for coating an ophthalmic lens within an injection molding machine |
US7850879B2 (en) | 2005-12-21 | 2010-12-14 | Essilor International (Compagnie Generale D'optique) | Method for coating an ophthalmic lens within an injection molding machine |
WO2013164055A1 (en) * | 2012-05-02 | 2013-11-07 | Heraeus Noblelight Gmbh | Method for producing an optical module having a polymer lens, optical module and use thereof |
CN104395051A (en) * | 2012-05-02 | 2015-03-04 | 贺利氏特种光源有限责任公司 | Method for producing optical module having polymer lens, optical module and use thereof |
TWI554377B (en) * | 2012-05-02 | 2016-10-21 | 賀利氏諾伯燈具公司 | Method for producing an optical module having a polymer optical system, optical module, and lamp and use thereof |
US10324232B2 (en) | 2012-05-02 | 2019-06-18 | Heraeus Noblelight Gmbh | Method for producing an optical module having a polymer optical system |
Also Published As
Publication number | Publication date |
---|---|
BE466276A (en) | 1946-12-27 |
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