HK86488A - Manufacturing process of half-finished contact lenses - Google Patents

Manufacturing process of half-finished contact lenses

Info

Publication number
HK86488A
HK86488A HK864/88A HK86488A HK86488A HK 86488 A HK86488 A HK 86488A HK 864/88 A HK864/88 A HK 864/88A HK 86488 A HK86488 A HK 86488A HK 86488 A HK86488 A HK 86488A
Authority
HK
Hong Kong
Prior art keywords
blank
semi
produced
contact lens
finished
Prior art date
Application number
HK864/88A
Inventor
Otto-Christian Dr Geyer
Frank Dr Wingler
Original Assignee
Bayer Ag
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 Bayer Ag filed Critical Bayer Ag
Publication of HK86488A publication Critical patent/HK86488A/en

Links

Classifications

    • 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
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ophthalmology & Optometry (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Eyeglasses (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Solid State Image Pick-Up Elements (AREA)
  • Coloring (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

1. Process for the production of a semi-finished contact lens by thermal deformation of thermoplastic materials, characterized in that a) a cylindrical blank (3) is first produced from the thermoplastic material, the weight of which blank is substantially equal to the weight of the semi-finished product to be produced, b) the blank (3) is then introduced into a closed press having two rams (4, 5) facing one another and moving in a sleeve (6), one ram having a convexly curved, aspherical surface corresponding to the internal surface (2) of the contact lens to be produced, and in that c) the blank (3) is shaped in the press under pressure at a temperature above the glass transition temperature of the thermoplastic material to form the semi-finished contact lens with completely formed aspherical back surface.
HK864/88A 1984-07-28 1988-10-27 Manufacturing process of half-finished contact lenses HK86488A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE3427887 1984-07-28

Publications (1)

Publication Number Publication Date
HK86488A true HK86488A (en) 1988-11-04

Family

ID=6241811

Family Applications (1)

Application Number Title Priority Date Filing Date
HK864/88A HK86488A (en) 1984-07-28 1988-10-27 Manufacturing process of half-finished contact lenses

Country Status (7)

Country Link
EP (1) EP0170141B1 (en)
JP (1) JPS6141118A (en)
KR (1) KR860001357A (en)
AT (1) ATE34335T1 (en)
DE (1) DE3562730D1 (en)
ES (1) ES8608399A1 (en)
HK (1) HK86488A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220919A3 (en) * 1985-10-21 1989-04-12 Shin-Etsu Chemical Co., Ltd. Contact lens
DE3543357A1 (en) * 1985-12-07 1987-06-11 Bayer Ag METHOD AND DEVICE FOR THE PRODUCTION OF CONTACT LENS BLANKS WITH FINALLY TRAINED REAR SURFACE GEOMETRIES
US5141677A (en) * 1991-01-22 1992-08-25 Minnesota Mining And Manufacturing Company Method of hot stamping intraocular lens bodies
US5760100B1 (en) 1994-09-06 2000-11-14 Ciba Vision Corp Extended wear ophthalmic lens
US7468398B2 (en) 1994-09-06 2008-12-23 Ciba Vision Corporation Extended wear ophthalmic lens
JP4087947B2 (en) * 1998-05-08 2008-05-21 Ｈｏｙａヘルスケア株式会社 Manufacturing method of gas permeable hard contact lens
US6162376A (en) 1999-02-24 2000-12-19 Mead Opthalmics Compression molding of optical lenses
KR100368014B1 (en) * 2000-10-18 2003-01-24 (주)보성기연 the method of manufacturing FRP flange pipe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH280552A (en) * 1950-03-23 1952-01-31 Diplom Optiker Albert Braun Fa Method and device for the production of eye cups.
GB819474A (en) * 1955-05-13 1959-09-02 Frederick Thomas Ridley Contact lenses
AT265699B (en) * 1966-02-15 1968-10-25 Ceskoslovenska Akademie Ved Process for the production of lenses with aspherical surfaces from plastic
DE2729385A1 (en) * 1976-07-12 1978-01-19 American Optical Corp Distortion-free thermoplastic ophthalmic lens prodn. - by pressing dried, preheated preform between tools with optical surfaces
DE3325055A1 (en) * 1983-07-12 1985-01-24 Bayer Ag, 5090 Leverkusen METHOD FOR PRODUCING CONTACT OPTICAL OBJECTS

Also Published As

Publication number Publication date
EP0170141A3 (en) 1986-07-09
ATE34335T1 (en) 1988-06-15
ES545600A0 (en) 1986-06-16
JPS6141118A (en) 1986-02-27
KR860001357A (en) 1986-02-26
DE3562730D1 (en) 1988-06-23
EP0170141B1 (en) 1988-05-18
EP0170141A2 (en) 1986-02-05
ES8608399A1 (en) 1986-06-16

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Legal Events

Date Code Title Description
NR Patent deemed never to have been added to the register under section 13(7) of patents (transitional arrangements) rules