GB538653A - Improvements in or relating to optical objectives - Google Patents
Improvements in or relating to optical objectivesInfo
- Publication number
- GB538653A GB538653A GB248840A GB248840A GB538653A GB 538653 A GB538653 A GB 538653A GB 248840 A GB248840 A GB 248840A GB 248840 A GB248840 A GB 248840A GB 538653 A GB538653 A GB 538653A
- Authority
- GB
- United Kingdom
- Prior art keywords
- component
- double
- concave
- taylor
- lie
- 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)
- Joining Of Glass To Other Materials (AREA)
- Glass Compositions (AREA)
Abstract
538,653. Lenses. TAYLOR, TAYLOR & HOBSON, Ltd., and WARMISHAM, A. Feb. 9, 1940, No. 2488. Drawings to Specification. [Class 97 (i)] In an objective comprising four air-separated components, the first and fourth being simple convergent elements, and the third a simple asymmetrical double-concave element, the second component comprises a double-convex element cemented to a double-concave one, the glass of the convex element having a higher mean refractive index and a greater Abbe v number than the glass of the concave element. The difference of the refractive indices of the second component may lie between 0.025 and 0.045, and the refractive index andAbbe numbers of the third component may be respectively higher than 1.65 and substantially less than 33.5. The shallow side of the third component may be towards the front, its radius lying between twice and six times that of the other side, and the air separation of the second and third components may lie between 7¢ per cent. and 12¢ per cent. of the equivalent focal length of the objective. Specifications 477,424 and 517,386 are referred to ; data for one example are set out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB248840A GB538653A (en) | 1940-02-09 | 1940-02-09 | Improvements in or relating to optical objectives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB248840A GB538653A (en) | 1940-02-09 | 1940-02-09 | Improvements in or relating to optical objectives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB538653A true GB538653A (en) | 1941-08-12 |
Family
ID=9740448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB248840A Expired GB538653A (en) | 1940-02-09 | 1940-02-09 | Improvements in or relating to optical objectives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB538653A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2416443A (en) * | 1943-04-23 | 1947-02-25 | Polaroid Corp | Optical system |
| US2600208A (en) * | 1949-07-14 | 1952-06-10 | Taylor Taylor & Hobson Ltd | Four component objectives with second component a convergent cemented doublet having a dispersive internal contact surface |
| DE1087364B (en) * | 1958-10-30 | 1960-08-18 | Zeiss Carl Fa | Five-lens lens |
| US3065671A (en) * | 1959-03-20 | 1962-11-27 | Bell & Howell Co | Optical objective |
| JPS53118499U (en) * | 1977-02-28 | 1978-09-20 | ||
| CZ305522B6 (en) * | 2014-09-26 | 2015-11-11 | Pramacom-Ht, Spol. S R.O. | Objective |
-
1940
- 1940-02-09 GB GB248840A patent/GB538653A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2416443A (en) * | 1943-04-23 | 1947-02-25 | Polaroid Corp | Optical system |
| US2600208A (en) * | 1949-07-14 | 1952-06-10 | Taylor Taylor & Hobson Ltd | Four component objectives with second component a convergent cemented doublet having a dispersive internal contact surface |
| DE1087364B (en) * | 1958-10-30 | 1960-08-18 | Zeiss Carl Fa | Five-lens lens |
| US3065671A (en) * | 1959-03-20 | 1962-11-27 | Bell & Howell Co | Optical objective |
| JPS53118499U (en) * | 1977-02-28 | 1978-09-20 | ||
| CZ305522B6 (en) * | 2014-09-26 | 2015-11-11 | Pramacom-Ht, Spol. S R.O. | Objective |
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