GB440397A - Improvements in optical systems - Google Patents
Improvements in optical systemsInfo
- Publication number
- GB440397A GB440397A GB9439/34A GB943934A GB440397A GB 440397 A GB440397 A GB 440397A GB 9439/34 A GB9439/34 A GB 9439/34A GB 943934 A GB943934 A GB 943934A GB 440397 A GB440397 A GB 440397A
- Authority
- GB
- United Kingdom
- Prior art keywords
- component
- focal length
- components
- given
- numerically
- 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
- G02B21/00—Microscopes
- G02B21/02—Objectives
- G02B21/025—Objectives with variable magnification
-
- 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
- G02B15/1435—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 the first group being negative
- G02B15/143507—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 the first group being negative arranged -++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Lenses (AREA)
Abstract
440,397. Lenses. CHRETIEN, H., 4, Rue Pigache, Saint Cloud, Seine-et-Oise, France. March 26, 1934, No. 9439. Void [Abridged as open to inspection under Sect. 91 of the Acts, Sept. 26, 1934]. [Class 97 (i)] A lens system for photography or projection comprises a divergent component D and two convergent components C, C<1>, each component being corrected as regards spherical and chromatic aberrations for an object at infinity and the component D being on the longer conjugate side of the system. The system is particularly intended as an objective of which the focal length can be varied by displacing the components C, C<1> relatively to the component D and to each other, the displacements being so related that the image plane remains fixed for a given position of the object. The focal length of the component D is numerically equal to the mean of the maximum and minimum values of the focal length of the system. The components C, C<1> are preferably'identical and have a focal length which is numerically greater than that of the component D. Constructional data are given.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9439/34A GB440397A (en) | 1934-03-26 | 1934-03-26 | Improvements in optical systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9439/34A GB440397A (en) | 1934-03-26 | 1934-03-26 | Improvements in optical systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB440397A true GB440397A (en) | 1935-12-30 |
Family
ID=9871983
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9439/34A Expired GB440397A (en) | 1934-03-26 | 1934-03-26 | Improvements in optical systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB440397A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2741155A (en) * | 1951-09-11 | 1956-04-10 | Watson W & Sons Ltd | Variable magnification optical systems |
US2959101A (en) * | 1957-09-20 | 1960-11-08 | Bell & Howell Co | Optical objective of variable equivalent focal length |
US2997919A (en) * | 1960-03-28 | 1961-08-29 | Bausch & Lomb | Variable power objective |
US3030861A (en) * | 1959-06-29 | 1962-04-24 | Bausch & Lomb | Variable power optical system for microscopes |
US3034404A (en) * | 1958-11-13 | 1962-05-15 | Paillard Sa | Variable focal objectives |
US3286592A (en) * | 1961-04-22 | 1966-11-22 | Wagner Helmut | Objective with continually variable focal length and fixed image plane |
US5703727A (en) * | 1994-07-22 | 1997-12-30 | Telesensory Corporation | Zoom lens and magnifier utilizing the same |
-
1934
- 1934-03-26 GB GB9439/34A patent/GB440397A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2741155A (en) * | 1951-09-11 | 1956-04-10 | Watson W & Sons Ltd | Variable magnification optical systems |
US2959101A (en) * | 1957-09-20 | 1960-11-08 | Bell & Howell Co | Optical objective of variable equivalent focal length |
US3034404A (en) * | 1958-11-13 | 1962-05-15 | Paillard Sa | Variable focal objectives |
US3030861A (en) * | 1959-06-29 | 1962-04-24 | Bausch & Lomb | Variable power optical system for microscopes |
US2997919A (en) * | 1960-03-28 | 1961-08-29 | Bausch & Lomb | Variable power objective |
US3286592A (en) * | 1961-04-22 | 1966-11-22 | Wagner Helmut | Objective with continually variable focal length and fixed image plane |
US5703727A (en) * | 1994-07-22 | 1997-12-30 | Telesensory Corporation | Zoom lens and magnifier utilizing the same |
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