GB846669A - Improvements in devices and methods of forming optical elements - Google Patents

Improvements in devices and methods of forming optical elements

Info

Publication number
GB846669A
GB846669A GB849259A GB849259A GB846669A GB 846669 A GB846669 A GB 846669A GB 849259 A GB849259 A GB 849259A GB 849259 A GB849259 A GB 849259A GB 846669 A GB846669 A GB 846669A
Authority
GB
United Kingdom
Prior art keywords
moulding
mould
curvature
optical elements
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
Application number
GB849259A
Inventor
Harry Drew Crandon
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.)
American Optical Corp
Original Assignee
American Optical Corp
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 American Optical Corp filed Critical American Optical Corp
Priority to GB849259A priority Critical patent/GB846669A/en
Publication of GB846669A publication Critical patent/GB846669A/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
    • B29D11/00019—Production of simple or compound lenses with non-spherical faces, e.g. toric faces
    • 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
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • 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
    • B29C33/38—Moulds or cores; Details thereof or accessories therefor characterised by the material or the manufacturing process

Landscapes

  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ophthalmology & Optometry (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

846,669. Moulding optical elements. AMERICAN OPTICAL CO. March 11, 1959, No. 8492/59. Class 87(2). A mould for forming lenses comprises mould halves 14, 15 supported by surfaces 12, 13, respectively, of a cylindrical support 10, the moulding surface of the half 15 having the curvature desired of one side of the lens, and the moulding surface of the half 14 having a central portion 17 of the desired spherical curvature of the other side of the lens and an outer portion 19 of different curvature to form an outwardly tapering space with the adjacent surface portion of the half 15. The lower half 14 is drawn upwardly on shrinkage of the moulding material during the moulding operation, the tapering space allowing the peripheral portion of the material to flow freely inwardly. The mould may be used for forming lenses of polycyclohexyl or polymethylmethacrylate, polystyrene, polyallyl di-glycol carbonate, or a copolymer of methyl methacrylate and allyl di-glycol carbonate, which are placed in the mould in a liquid state and are heated to complete their polymerization.
GB849259A 1959-03-11 1959-03-11 Improvements in devices and methods of forming optical elements Expired GB846669A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB849259A GB846669A (en) 1959-03-11 1959-03-11 Improvements in devices and methods of forming optical elements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB849259A GB846669A (en) 1959-03-11 1959-03-11 Improvements in devices and methods of forming optical elements

Publications (1)

Publication Number Publication Date
GB846669A true GB846669A (en) 1960-08-31

Family

ID=9853499

Family Applications (1)

Application Number Title Priority Date Filing Date
GB849259A Expired GB846669A (en) 1959-03-11 1959-03-11 Improvements in devices and methods of forming optical elements

Country Status (1)

Country Link
GB (1) GB846669A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2383002A1 (en) * 1977-03-10 1978-10-06 Greshes Martin METHOD AND APPARATUS FOR MOLDING OPTICAL PLASTIC LENSES OF THE STANDARD AND BIFOCAL TYPE
FR2622835A1 (en) * 1987-11-09 1989-05-12 Ocutech PROCESS AND APPARATUS FOR PRODUCING MOLDED ARTICLES, IN THERMOSETTING AND THERMOPLASTIC MATERIALS, IN PARTICULAR FOR CONTACT LENSES FOR OPHTHALMIC USE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2383002A1 (en) * 1977-03-10 1978-10-06 Greshes Martin METHOD AND APPARATUS FOR MOLDING OPTICAL PLASTIC LENSES OF THE STANDARD AND BIFOCAL TYPE
FR2622835A1 (en) * 1987-11-09 1989-05-12 Ocutech PROCESS AND APPARATUS FOR PRODUCING MOLDED ARTICLES, IN THERMOSETTING AND THERMOPLASTIC MATERIALS, IN PARTICULAR FOR CONTACT LENSES FOR OPHTHALMIC USE
BE1001759A5 (en) * 1987-11-09 1990-02-27 Ocutech PROCESS AND APPARATUS FOR PRODUCING MOLDED ARTICLES, OF THERMOSETTING AND THERMOPLASTIC MATERIALS, IN PARTICULAR FOR CONTACT LENSES FOR OPHTHALMIC USE.

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