GB618253A - Improvements in or relating to optical objectives - Google Patents
Improvements in or relating to optical objectivesInfo
- Publication number
- GB618253A GB618253A GB1317846A GB1317846A GB618253A GB 618253 A GB618253 A GB 618253A GB 1317846 A GB1317846 A GB 1317846A GB 1317846 A GB1317846 A GB 1317846A GB 618253 A GB618253 A GB 618253A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- lens
- lenses
- positive
- meniscii
- 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
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0884—Catadioptric systems having a pupil corrector
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
618,253. Lens systems. WRAY (OPTICAL WORKS), Ltd., and WYNNE, C. G. May 1, 1946, Nos. 13178 and 22992. [Class 97 (i)] The aberrations of a concave spherical mirror are corrected by at least two meniscus lenses placed before it one convex and the other concave to the mirror, none of the meniscus lenses having its two surfaces concentric and the centres of curvature of all the lens surfaces and that of the mirror lying in the space between the lenses. Fig. 1 shows a system particularly adapted for projection of the image on a cathode-ray tube C, correction being effected by meniscii F, B and a diaphragm A. For use in photography, the film is placed at the focal surface S and a positive lens L provided as " field-flattener " as described in Specifications 24641/95, [Class 97], and 544,694. Alternatively, a plane mirror m may reflect the light through a central aperture a in the mirror and a positive lens L<1>. Numerical data are given for such a lens and also for lenses in which one or both of the meniscii F and B is divided into a positive and negative meniscus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1317846A GB618253A (en) | 1946-05-01 | 1946-05-01 | Improvements in or relating to optical objectives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1317846A GB618253A (en) | 1946-05-01 | 1946-05-01 | Improvements in or relating to optical objectives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB618253A true GB618253A (en) | 1949-02-18 |
Family
ID=10018260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1317846A Expired GB618253A (en) | 1946-05-01 | 1946-05-01 | Improvements in or relating to optical objectives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB618253A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2642488A (en) * | 1949-01-03 | 1953-06-16 | Rca Corp | Schmidt television projector having meniscus to correct for antihalation lens |
| US2726574A (en) * | 1950-09-11 | 1955-12-13 | Leitz Ernst Gmbh | Reflecting mirror and lens objective of the cassegrain type |
| US4757354A (en) * | 1986-05-02 | 1988-07-12 | Matsushita Electrical Industrial Co., Ltd. | Projection optical system |
| US5796515A (en) * | 1996-07-09 | 1998-08-18 | Nikon Corporation | Catadioptric optical system |
-
1946
- 1946-05-01 GB GB1317846A patent/GB618253A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2642488A (en) * | 1949-01-03 | 1953-06-16 | Rca Corp | Schmidt television projector having meniscus to correct for antihalation lens |
| US2726574A (en) * | 1950-09-11 | 1955-12-13 | Leitz Ernst Gmbh | Reflecting mirror and lens objective of the cassegrain type |
| US4757354A (en) * | 1986-05-02 | 1988-07-12 | Matsushita Electrical Industrial Co., Ltd. | Projection optical system |
| US5796515A (en) * | 1996-07-09 | 1998-08-18 | Nikon Corporation | Catadioptric optical system |
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