GB1460984A - Glass for multifocal spectacle glasses - Google Patents
Glass for multifocal spectacle glassesInfo
- 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
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.
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)
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2112376B1 (en) * | 1970-11-02 | 1976-04-30 | Jenaer Glaswerk Schott & Gen |
-
1973
- 1973-08-20 DE DE19732341929 patent/DE2341929C3/en not_active Expired
- 1973-10-09 CA CA182,885A patent/CA1021981A/en not_active Expired
- 1973-10-30 AT AT915373A patent/AT337922B/en not_active IP Right Cessation
- 1973-11-05 DD DD17446973A patent/DD107658A5/xx unknown
- 1973-11-20 IT IT7040973A patent/IT1000653B/en active
- 1973-12-01 JP JP13644373A patent/JPS5413245B2/ja not_active Expired
-
1974
- 1974-04-05 FR FR7412114A patent/FR2241506B1/fr not_active Expired
- 1974-07-30 GB GB3363374A patent/GB1460984A/en not_active Expired
Cited By (4)
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 |