GB190903444A - Improvements in the Process of Producing Lenses by Subsidence - Google Patents
Improvements in the Process of Producing Lenses by SubsidenceInfo
- Publication number
- GB190903444A GB190903444A GB190903444DA GB190903444A GB 190903444 A GB190903444 A GB 190903444A GB 190903444D A GB190903444D A GB 190903444DA GB 190903444 A GB190903444 A GB 190903444A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- subsidence
- lens
- spherical surface
- spherical
- 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
Abstract
3444. Zeiss, C., [Firm of]. June 18, 1908, [Convention date]. Lenses.-Relates to an improvement on the method described in the U.S.A Patent 4786/46 for producing, by the subsidence of glass in a mould, aplanatic refracting lens surfaces of a non-spherical character. Instead of the mould surface being the same as the spherical surface of the lens it is given a calculated spherical or non-spherical surface c. After subsidence the lens appears as shown in Fig. 2 with the required non - spherical surface at b<2>. The correct spherical surface d, Fig. 3, is given to the lens by grinding. Lenses in which there is no great difference between the thicknesses at the margin and vertex may be produced from a flat sheet of glass with the aid of a mould having multiple mould surfaces.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE190903444X | 1908-06-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190903444A true GB190903444A (en) | 1909-04-22 |
Family
ID=32405200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190903444D Expired GB190903444A (en) | 1908-06-18 | 1909-02-12 | Improvements in the Process of Producing Lenses by Subsidence |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190903444A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2482698A (en) * | 1943-05-06 | 1949-09-20 | American Optical Corp | Optical lens means having a nonspherical refracting surface |
US2596799A (en) * | 1947-06-27 | 1952-05-13 | American Optical Corp | Aberration corrector member for image forming optical objectives |
-
1909
- 1909-02-12 GB GB190903444D patent/GB190903444A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2482698A (en) * | 1943-05-06 | 1949-09-20 | American Optical Corp | Optical lens means having a nonspherical refracting surface |
US2596799A (en) * | 1947-06-27 | 1952-05-13 | American Optical Corp | Aberration corrector member for image forming optical objectives |
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