GB1028691A - Optical system of variable focal length - Google Patents
Optical system of variable focal lengthInfo
- Publication number
- GB1028691A GB1028691A GB225/63A GB22563A GB1028691A GB 1028691 A GB1028691 A GB 1028691A GB 225/63 A GB225/63 A GB 225/63A GB 22563 A GB22563 A GB 22563A GB 1028691 A GB1028691 A GB 1028691A
- Authority
- GB
- United Kingdom
- Prior art keywords
- focal length
- variable focal
- lenses
- optical system
- positive
- 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
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/142—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having two groups only
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
1,028,691. Variable focal length systems. SOC D'OPITIQUE ET DE MECANIQUE DE HAUTE PRECISION. Jan. 2,1963 [Feb.13, 1962], No. 225/63. Heading G2J. The system comprises two optical members L 2 , L 5 , movable in opposite directions through predetermined distances, the displacements being linearly proportional to the ratio of the predetermined distances and so proportioned that the image passes three times through a stationary plane. The system is computed on the basis of one system, Fig. 2, not shown, comprising member L 2 between two lenses of power +1 being placed in front of a second system, Fig. 3, not shown, comprising member L 5 between two lenses of power -1, so that the two adjacent lenses at plane P are of powers +1 and -1 so that they may be eliminated. It is shown that systems may be developed with L 5 positive and L 2 either negative as in Fig. 5 or positive as in Fig. 10, not shown.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR887806A FR1322227A (en) | 1962-02-13 | 1962-02-13 | Variable focal length optical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1028691A true GB1028691A (en) | 1966-05-04 |
Family
ID=8772540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB225/63A Expired GB1028691A (en) | 1962-02-13 | 1963-01-02 | Optical system of variable focal length |
Country Status (3)
| Country | Link |
|---|---|
| CH (1) | CH392921A (en) |
| FR (1) | FR1322227A (en) |
| GB (1) | GB1028691A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1196392B (en) * | 1963-07-06 | 1965-07-08 | Leitz Ernst Gmbh | Pancratic lens for microscopes |
| FR2193210B1 (en) * | 1972-07-21 | 1976-06-11 | Labo Electronique Physique |
-
1962
- 1962-02-13 FR FR887806A patent/FR1322227A/en not_active Expired
- 1962-11-28 CH CH1394062A patent/CH392921A/en unknown
-
1963
- 1963-01-02 GB GB225/63A patent/GB1028691A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH392921A (en) | 1965-05-31 |
| FR1322227A (en) | 1963-03-29 |
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