GB620317A - New or improved process and apparatus for the moulding of contact lenses - Google Patents

New or improved process and apparatus for the moulding of contact lenses

Info

Publication number
GB620317A
GB620317A GB2585546A GB2585546A GB620317A GB 620317 A GB620317 A GB 620317A GB 2585546 A GB2585546 A GB 2585546A GB 2585546 A GB2585546 A GB 2585546A GB 620317 A GB620317 A GB 620317A
Authority
GB
United Kingdom
Prior art keywords
mould
impression
male die
placing
contact lenses
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
GB2585546A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB2585546A priority Critical patent/GB620317A/en
Priority to FR933047D priority patent/FR933047A/en
Publication of GB620317A publication Critical patent/GB620317A/en
Expired legal-status Critical Current

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
    • B29D11/00038—Production of contact lenses
    • B29D11/00086—Production of contact lenses methods for matching the anterior surface of the contact lens to the shape of an eyeball
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/02—Lenses; Lens systems ; Methods of designing lenses
    • G02C7/04—Contact lenses for the eyes
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor

Abstract

620,317. Moulding contact lenses. TARTARI, R. A. Aug. 28, 1946, No. 25855. [Class 87 (ii)] A process for moulding contact lenses of thermo-plastic material comprises the following steps :- (1) obtaining an impression of the front surface 37, 38 of the eyeball as shown in Fig. 2 ; (2) modifying, in accordance with the needs of the patient, the central corneal part 37 of the impression by means of a male die 32 with an optical curve as shown in Fig. 3; (3) filling the remaining portion of the impression with gypsum &c., so as to obtain a plaster cast 39 of the outer sclerotic surface 38 of the eyeball; (4) removing the cast now united with the male die 32 and together comprising a mould from the impression ; (5) placing the mould so formed in a muffle -furnace 41, a corresponding female die 43 being placed on the male die 32 and the remaining part of the muffle 41 being filled with gypsum &c. which once it has set and is united with the female die 43 provides a negative or mould backing as shown in Fig. 4; (6) placing a laminÓ 46, Fig. 6, of thermoplastic material between the mould and mould backing, softening it by heat and after placing a metal filling 47 between the mould and mould backing, applying pressure to the assembly; (7) allowing the thermoplastic material to cool and finally dismantling the assembly. Apparatus for modifying the central corneal part of the impression comprises a rod (23, Fig. 1, not shown), fitted at its lower end with the optical curve male die 32 and slidable in supports 14, 16, the rod 23 being provided with micrometric axial displacing means 20 and screws 28 for centering the rod in relation to a semi-spherical cavity 4 in which the receptable 9 containing the impression is placed.
GB2585546A 1946-08-28 1946-08-28 New or improved process and apparatus for the moulding of contact lenses Expired GB620317A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB2585546A GB620317A (en) 1946-08-28 1946-08-28 New or improved process and apparatus for the moulding of contact lenses
FR933047D FR933047A (en) 1946-08-28 1946-08-29 Method and apparatus for the manufacture of contact lenses

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2585546A GB620317A (en) 1946-08-28 1946-08-28 New or improved process and apparatus for the moulding of contact lenses

Publications (1)

Publication Number Publication Date
GB620317A true GB620317A (en) 1949-03-23

Family

ID=10234425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2585546A Expired GB620317A (en) 1946-08-28 1946-08-28 New or improved process and apparatus for the moulding of contact lenses

Country Status (2)

Country Link
FR (1) FR933047A (en)
GB (1) GB620317A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595293A1 (en) * 1986-03-05 1987-09-11 Ceskoslovenska Akademie Ved METHOD AND EQUIPMENT FOR THE POLYMERIZATION MOLDING OF ARTICLES, IN PARTICULAR LENTILS, FROM HYDROPHILIC GELS
EP0496544A2 (en) * 1991-01-22 1992-07-29 Minnesota Mining And Manufacturing Company Intraocular lens and hot stamping method of manufacture
RU2579396C2 (en) * 2010-03-12 2016-04-10 Джонсон Энд Джонсон Вижн Кэа, Инк. Compound for moulding lens precursor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5288221A (en) * 1992-05-18 1994-02-22 Essilor Of America, Inc. Apparatus for making ophthalmic lenses

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2595293A1 (en) * 1986-03-05 1987-09-11 Ceskoslovenska Akademie Ved METHOD AND EQUIPMENT FOR THE POLYMERIZATION MOLDING OF ARTICLES, IN PARTICULAR LENTILS, FROM HYDROPHILIC GELS
US4806287A (en) * 1986-03-05 1989-02-21 Ceskoslovenska Akademie Ved Method for polymerization cast molding of lenses from hydrophilic gels
EP0496544A2 (en) * 1991-01-22 1992-07-29 Minnesota Mining And Manufacturing Company Intraocular lens and hot stamping method of manufacture
EP0496544A3 (en) * 1991-01-22 1993-02-24 Minnesota Mining And Manufacturing Company Intraocular lens and hot stamping method of manufacture
RU2579396C2 (en) * 2010-03-12 2016-04-10 Джонсон Энд Джонсон Вижн Кэа, Инк. Compound for moulding lens precursor

Also Published As

Publication number Publication date
FR933047A (en) 1948-04-12

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