GB1511901A - Forming lenses and lens blanks - Google Patents

Forming lenses and lens blanks

Info

Publication number
GB1511901A
GB1511901A GB1622875A GB1622875A GB1511901A GB 1511901 A GB1511901 A GB 1511901A GB 1622875 A GB1622875 A GB 1622875A GB 1622875 A GB1622875 A GB 1622875A GB 1511901 A GB1511901 A GB 1511901A
Authority
GB
United Kingdom
Prior art keywords
material
reservoir
polymerization
cavity
mould
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
Application number
GB1622875A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bausch and Lomb Inc
Original Assignee
Bausch and Lomb Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to US46693374A priority Critical
Priority to US56440375A priority
Application filed by Bausch and Lomb Inc filed Critical Bausch and Lomb Inc
Publication of GB1511901A publication Critical patent/GB1511901A/en
Application status is Expired legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/30Mounting, exchanging or centering
    • B29C33/303Mounting, exchanging or centering centering mould parts or halves, e.g. during mounting
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor
    • B29C33/0038Moulds or cores; Details thereof or accessories therefor with sealing means or the like
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0888Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds
    • B29C35/0894Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using transparant moulds provided with masks or diaphragms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/005Compensating volume or shape change during moulding, in general
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32Component parts, details or accessories; Auxiliary operations
    • B29C43/36Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/38Moulds for making articles of definite length, i.e. discrete articles with means to avoid flashes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/00009Production of simple or compound lenses
    • B29D11/00038Production of contact lenses
    • B29D11/00057Production of contact lenses characterised by the shape or surface condition of the edge, e.g. flashless, burrless, smooth
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/00009Production of simple or compound lenses
    • B29D11/00432Auxiliary operations, e.g. machines for filling the moulds
    • B29D11/00442Curing the lens material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29DPRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00Producing optical elements, e.g. lenses or prisms
    • B29D11/00932Combined cutting and grinding thereof
    • B29D11/00942Combined cutting and grinding thereof where the lens material is mounted in a support for mounting onto a cutting device, e.g. a lathe, and where the support is of machinable material, e.g. plastics
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00Optical elements, e.g. lenses, prisms
    • B29L2011/0016Lenses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/76Office equipment or accessories
    • B29L2031/7602Maps

Abstract

1511901 Moulding lenses BAUSCH & LOMB Inc 18 April 1975 [6 May 1974 8 April 1975] 16228/75 Heading B5A In the casting of lenses from material which changes volume on polymerization using a mould having a reservoir connected through a restriction to the moulding cavity, the mould cavity is completely filled and the reservoir at least partly filled with the polymerizable material, and the mould parts are configured to produce axial and/or radial alignment thereof. Preferably polymerization is inhibited in the reservoir during polymerization in the mould cavity so that material may pass to or from the cavity to compensate for any change in volume. In Fig. 3 a male member 13 is brought into contact with projections 131 on a female member 115 containing polymerizable material, thereby forming a mould cavity 133 and displacing excess material into an annular reservoir 135. The spaces between the projections 131 form part annular restrictions through which material can pass. The members 13 and 115 are made of glass to facilitate polymerization by U.V. irradiation through either of them. An annular shield 141 is used initially so that the centre is polymerized first, and finally the flash in the reservoir is polymerized. With certain cross-linking hydrophilic polymers the oxygen in the air inhibits polymerization and a nitrogen atmosphere is necessary during polymerization of the flash. In cases where a thermosetting material is heated to cure it both the initial expansion and the subsequent shrinkage of the material will be accommodated by the reservoir. In Fig. 7 the upper and lower female members 413, 15 are axially aligned with a very small clearance at 49 and 51. The viscosity of the moulding material and the weight of the upper member are chosen so that a thin film remains between the members 413, 15 to form a restricted connection 429 between the cavity 431 and the reservoir 433. The cured lens is machined by mounting the male member, with the lens still attached, on a lathe having a rotating fly cutter for generating the desired curvature.
GB1622875A 1974-05-06 1975-04-18 Forming lenses and lens blanks Expired GB1511901A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US46693374A true 1974-05-06 1974-05-06
US56440375A true 1975-04-08 1975-04-08

Publications (1)

Publication Number Publication Date
GB1511901A true GB1511901A (en) 1978-05-24

Family

ID=27041840

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1622875A Expired GB1511901A (en) 1974-05-06 1975-04-18 Forming lenses and lens blanks

Country Status (7)

Country Link
JP (1) JPS598219B2 (en)
CA (1) CA1070066A (en)
DE (1) DE2518905C2 (en)
FR (1) FR2270082B1 (en)
GB (1) GB1511901A (en)
IT (1) IT1032811B (en)
SE (1) SE418822B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203092A (en) * 1987-04-03 1988-10-12 Kei Mori Casting
US5143660A (en) * 1988-11-02 1992-09-01 National Research Development Corporation Method of casting a contact lens
US5254000A (en) * 1992-04-23 1993-10-19 Corning Incorporated Organic polymer lens mold
US5573108A (en) * 1988-11-02 1996-11-12 British Technology Group Ltd. Disposable contact lens package
WO2014122476A1 (en) * 2013-02-08 2014-08-14 Ocutec Limited Molding apparatus and method

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4121896A (en) * 1976-03-24 1978-10-24 Shepherd Thomas H Apparatus for the production of contact lenses
JPS6030529B2 (en) * 1977-04-28 1985-07-17 Nippon Kontakuto Renzu Seizo Kk
US4155962A (en) * 1977-05-25 1979-05-22 Neefe Optical Laboratory, Inc. Method of removing molded lenses from the mold
US4165158A (en) * 1977-07-25 1979-08-21 American Optical Corporation Cast contact lenses and method for making same
DE2839249C2 (en) * 1977-09-12 1991-09-12 Toray Industries, Inc., Tokio/Tokyo, Jp
IT1094754B (en) * 1978-05-12 1985-08-02 Italiana Lenti S I L S R L Soc Process for the manufacture by continuous compensation to casting of lenses or optical means in synthetic resins polymerizable
US4209289A (en) * 1979-05-14 1980-06-24 American Optical Corporation Contact lens mold
DE2938098C2 (en) * 1979-09-20 1983-02-03 Deutsche Spezialglas Ag, 3223 Delligsen, De
FR2477059B1 (en) * 1980-02-28 1983-04-15 Medicornea Sa
FR2477058B1 (en) * 1980-02-28 1983-01-07 Medicornea Sa
NZ200362A (en) * 1981-04-30 1985-10-11 Mia Lens Prod A method of forming a hydrophilic polymer suitable for use in the manufacture of soft contact lenses and a mould for use in the polymerization
FR2523505B2 (en) * 1982-03-17 1984-06-08 Medicornea Sa
JPS6370619U (en) * 1986-10-29 1988-05-12
JPH01258916A (en) * 1988-04-09 1989-10-16 Asahi Optical Co Ltd Casting mold for molding lens
JPH0214718U (en) * 1988-07-13 1990-01-30
US5271875A (en) * 1991-09-12 1993-12-21 Bausch & Lomb Incorporated Method for molding lenses
DE19706846A1 (en) * 1997-02-21 1998-09-03 Bodenseewerk Geraetetech A device for light-initiated chemical cross-linking of material
JPH10315252A (en) * 1997-05-20 1998-12-02 Menicon Co Ltd Mold for molding lens blank and manufacture of contact lens
US6368522B1 (en) * 2000-01-03 2002-04-09 Johnson & Johnson Vision Care, Inc. Mold for forming a contact lens and method of preventing formation of small strands of contact lens material during contact lens manufacture
DE102009055088B4 (en) 2009-12-21 2015-04-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. A method for producing a structure, optical component, optical layer stack
DE102009055080A1 (en) * 2009-12-21 2011-06-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 80686 Method and apparatus for manufacturing a structure forming tool
JP5558152B2 (en) * 2010-03-23 2014-07-23 京セラメディカル株式会社 Light graft polymerization lens and film formation apparatus
MX355344B (en) * 2011-02-28 2018-04-16 Coopervision Int Holding Co Lp Phosphine-containing hydrogel contact lenses.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728106A (en) * 1950-09-08 1955-12-27 American Optical Corp Means for producing optical elements
US2890486A (en) * 1955-08-29 1959-06-16 American Optical Corp Mold for producing lens of any shape from a polymerizable material
GB847797A (en) * 1955-12-30 1960-09-14 Combined Optical Ind Ltd Improvements in or relating to the casting of synthetic resins
DE1945321A1 (en) * 1969-09-06 1971-03-11 Zeiss Carl Fa Optical components of duroplastic - synthetics

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2203092A (en) * 1987-04-03 1988-10-12 Kei Mori Casting
US5143660A (en) * 1988-11-02 1992-09-01 National Research Development Corporation Method of casting a contact lens
US5573108A (en) * 1988-11-02 1996-11-12 British Technology Group Ltd. Disposable contact lens package
US5578332A (en) * 1988-11-02 1996-11-26 British Technology Group Ltd. Contact lens mould
US5254000A (en) * 1992-04-23 1993-10-19 Corning Incorporated Organic polymer lens mold
WO2014122476A1 (en) * 2013-02-08 2014-08-14 Ocutec Limited Molding apparatus and method
US9791717B2 (en) 2013-02-08 2017-10-17 Ocutec Limited Molding apparatus and method

Also Published As

Publication number Publication date
DE2518905A1 (en) 1975-11-20
FR2270082A1 (en) 1975-12-05
CA1070066A (en) 1980-01-22
FR2270082B1 (en) 1977-11-18
JPS598219B2 (en) 1984-02-23
AU8063175A (en) 1976-11-04
SE7505165A (en) 1975-11-07
DE2518905C2 (en) 1984-10-04
CA1070066A1 (en)
IT1032811B (en) 1979-06-20
SE418822B (en) 1981-06-29
JPS50151966A (en) 1975-12-06

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee