GB678528A - Improvements in or relating to optical objectives - Google Patents
Improvements in or relating to optical objectivesInfo
- Publication number
- GB678528A GB678528A GB171750A GB171750A GB678528A GB 678528 A GB678528 A GB 678528A GB 171750 A GB171750 A GB 171750A GB 171750 A GB171750 A GB 171750A GB 678528 A GB678528 A GB 678528A
- Authority
- GB
- United Kingdom
- Prior art keywords
- components
- materials
- divergent
- convergent
- refractive indices
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
678,528. Optical objectives. COOK, G. H., and TAYLOR, TAYLOR & HOBSON, Ltd. Jan. 16, 1951 [Jan. 23, 1950], No. 1717/50. Class 97 (i). In a corrected objective comprising two simple convergent components located between two compound divergent components each consisting of a convergent element cemented.to a divergent element, all four components being of meniscus form with their air-exposed surfaces concave towards a diaphragm between the two simple components, the mean refractive indices of the materials of the two simple components each lie between 1.37 and 1.57 and their arithmetic mean is less than the arithmetic mean of the mean refractive indices of the materials of the convergent elements of the compound components by between 0.17 and 0.32 and also less than the arithmetic mean of the mean refractive indices of the materials of the divergent elements of the compound components by between 0.10 and 0.20. The two simple components may each be made of crystalline calcium fluoride. Numerical data for one example of the lens shown are given.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB171750A GB678528A (en) | 1950-01-23 | 1950-01-23 | Improvements in or relating to optical objectives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB171750A GB678528A (en) | 1950-01-23 | 1950-01-23 | Improvements in or relating to optical objectives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB678528A true GB678528A (en) | 1952-09-03 |
Family
ID=9726791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB171750A Expired GB678528A (en) | 1950-01-23 | 1950-01-23 | Improvements in or relating to optical objectives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB678528A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1104207B (en) * | 1957-04-18 | 1961-04-06 | Agfa Ag | Wide angle photographic lens |
| DE1258134B (en) * | 1965-10-14 | 1968-01-04 | Rodenstock Optik G | Four-element, six-lens lens |
| JPS51104822A (en) * | 1975-03-13 | 1976-09-17 | Asahi Optical Co Ltd | 4 gun 6 maikoseinoshashinrenzu |
-
1950
- 1950-01-23 GB GB171750A patent/GB678528A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1104207B (en) * | 1957-04-18 | 1961-04-06 | Agfa Ag | Wide angle photographic lens |
| DE1258134B (en) * | 1965-10-14 | 1968-01-04 | Rodenstock Optik G | Four-element, six-lens lens |
| JPS51104822A (en) * | 1975-03-13 | 1976-09-17 | Asahi Optical Co Ltd | 4 gun 6 maikoseinoshashinrenzu |
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