GB496865A - Improvements in four-lens photo-objectives - Google Patents
Improvements in four-lens photo-objectivesInfo
- Publication number
- GB496865A GB496865A GB15181/38A GB1518138A GB496865A GB 496865 A GB496865 A GB 496865A GB 15181/38 A GB15181/38 A GB 15181/38A GB 1518138 A GB1518138 A GB 1518138A GB 496865 A GB496865 A GB 496865A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- lenses
- objective
- focal length
- rear surface
- 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
- G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
- G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
496,865. Lenses. ZEISS, C., [Firm of]. May 21, 1938, No. 15181. Convention date, May 31, 1937. [Class 97 (i)] A photographic objective consisting of four simple lenses, the third lens from the object being divergent and the other lenses convergent, in which the front surfaces of the first and second lenses and the rear surface of the fourth lens are convex, in which each of these surfaces is curved more strongly than the other surface of the same lens, in which the rear surface of the third lens is curved more strongly than the front surface of this lens, and in which the axial distance apart of the third and fourth lenses is greater than the distance apart of the second and third, is characterized by the feature that the front surface of the first lens has a radius of curvature greater than 55 per cent of the focal length of the objective, that the axial thickness of the second lens is greater than 12 per cent of the focal length of the objective, that the third lens is of glass having a refractive index nd greater than 1À655 and an AbbÚ number less than 33À0, and that the radius of curvature of the rear surface of the second lens is no greater than the focal length of the objective. Data are given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE496865X | 1937-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB496865A true GB496865A (en) | 1938-12-07 |
Family
ID=6545089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15181/38A Expired GB496865A (en) | 1937-05-31 | 1938-05-21 | Improvements in four-lens photo-objectives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB496865A (en) |
-
1938
- 1938-05-21 GB GB15181/38A patent/GB496865A/en not_active Expired
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