GB1460984A - Glass for multifocal spectacle glasses - Google Patents

Glass for multifocal spectacle glasses

Info

Publication number
GB1460984A
GB1460984A GB3363374A GB3363374A GB1460984A GB 1460984 A GB1460984 A GB 1460984A GB 3363374 A GB3363374 A GB 3363374A GB 3363374 A GB3363374 A GB 3363374A GB 1460984 A GB1460984 A GB 1460984A
Authority
GB
United Kingdom
Prior art keywords
glass
near portion
multifocal
phototropic
refractive index
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
GB3363374A
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.)
Schott AG
Carl Zeiss AG
Original Assignee
Jenaer Glaswerk Schott and Gen
Carl Zeiss 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 Jenaer Glaswerk Schott and Gen, Carl Zeiss AG filed Critical Jenaer Glaswerk Schott and Gen
Publication of GB1460984A publication Critical patent/GB1460984A/en
Expired legal-status Critical Current

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
    • G02C7/06—Lenses; Lens systems ; Methods of designing lenses bifocal; multifocal ; progressive
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/04—Compositions for glass with special properties for photosensitive glass
    • C03C4/06—Compositions for glass with special properties for photosensitive glass for phototropic or photochromic glass

Landscapes

  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Ophthalmology & Optometry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Glass Compositions (AREA)
  • Eyeglasses (AREA)

Abstract

1460984 Optical glass CARL-ZEISSSTIFTUNG [trading as JENAER GLASWERK SCHOTT & GEN] 30 July 1974 [20 Aug 1973] 33633/74 Heading C1M A glass suitable for use as a remote portion lens in a multifocal glass system, and which may be phototropic, comprises, in percent by weight the balance, if any, consisting of one or more compatible constituents, the halogen and refining agent content, if any, being considered as additional to the 100% total of the other constituents, and the weight ratio SiO 2 : B 2 O 3 being 0À64-0À8 : 1. In making a phototropic glass, a batch comprising silver and halogen components is, after melt fusion, heat-treated at 550-675‹ C. for a time sufficient to develop silver halide discontinuities. Such a glass, which may have a refractive index n D of 1À52- 1-535 and a thermal expansion coefficient of 49- 55 x 10<SP>-7</SP>/deg. C., may be heat-fused to a near portion glass in making a multifocal lens, the near portion glass being of similar expansion coefficient and refractive index at least 1À60. Examples of near portion glasses are given. The glass of the invention may be strengthened by treatment with molten NaNO 3 for 16 hours at 465‹ C.
GB3363374A 1973-08-20 1974-07-30 Glass for multifocal spectacle glasses Expired GB1460984A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732341929 DE2341929C3 (en) 1973-08-20 1973-08-20 Phototropic, chemically hardenable distance lens based on silicoborate, suitable for fusing with photochromic near lens for bifocal lenses

Publications (1)

Publication Number Publication Date
GB1460984A true GB1460984A (en) 1977-01-06

Family

ID=5890170

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3363374A Expired GB1460984A (en) 1973-08-20 1974-07-30 Glass for multifocal spectacle glasses

Country Status (8)

Country Link
JP (1) JPS5413245B2 (en)
AT (1) AT337922B (en)
CA (1) CA1021981A (en)
DD (1) DD107658A5 (en)
DE (1) DE2341929C3 (en)
FR (1) FR2241506B1 (en)
GB (1) GB1460984A (en)
IT (1) IT1000653B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175298A (en) * 1985-05-20 1986-11-26 Central Glass Co Ltd Glass useful as either photosensitive glass or opaline foam glass
US4841119A (en) * 1986-12-19 1989-06-20 N.V. Bekaert S.A. Welding wire
CN111662008A (en) * 2020-06-30 2020-09-15 成都光明光电股份有限公司 Glass composition and method for producing same
CN115304283A (en) * 2022-01-24 2022-11-08 苏州东辉光学有限公司 C-Lens glass, blank preparation method, wire drawing furnace and wire drawing machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2346296A1 (en) * 1976-03-31 1977-10-28 Corning Glass Works Multifocal glass lens mfr. - using photochromic glass fused to another glass and heat treated
CN110093602B (en) * 2019-05-21 2020-10-13 哈尔滨工业大学 Method for preparing silver nanowire array by utilizing capillary wetting action

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2112376B1 (en) * 1970-11-02 1976-04-30 Jenaer Glaswerk Schott & Gen

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2175298A (en) * 1985-05-20 1986-11-26 Central Glass Co Ltd Glass useful as either photosensitive glass or opaline foam glass
US4841119A (en) * 1986-12-19 1989-06-20 N.V. Bekaert S.A. Welding wire
CN111662008A (en) * 2020-06-30 2020-09-15 成都光明光电股份有限公司 Glass composition and method for producing same
CN115304283A (en) * 2022-01-24 2022-11-08 苏州东辉光学有限公司 C-Lens glass, blank preparation method, wire drawing furnace and wire drawing machine

Also Published As

Publication number Publication date
DE2341929B2 (en) 1977-12-01
CA1021981A (en) 1977-12-06
ATA915373A (en) 1976-11-15
IT1000653B (en) 1976-04-10
AT337922B (en) 1977-07-25
JPS5045813A (en) 1975-04-24
DE2341929C3 (en) 1978-07-20
FR2241506B1 (en) 1977-10-28
DD107658A5 (en) 1974-08-12
FR2241506A1 (en) 1975-03-21
DE2341929A1 (en) 1975-04-24
JPS5413245B2 (en) 1979-05-29

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Legal Events

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