GB220961A - Improvements in and relating to lenses - Google Patents
Improvements in and relating to lensesInfo
- Publication number
- GB220961A GB220961A GB19984/24A GB1998424A GB220961A GB 220961 A GB220961 A GB 220961A GB 19984/24 A GB19984/24 A GB 19984/24A GB 1998424 A GB1998424 A GB 1998424A GB 220961 A GB220961 A GB 220961A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sections
- lens
- lenses
- along
- axis
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B41/00—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor
- G03B41/02—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor using non-intermittently running film
- G03B41/04—Special techniques not covered by groups G03B31/00 - G03B39/00; Apparatus therefor using non-intermittently running film with optical compensator
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
220,961. British Thomson-Houston Co., Ltd., (Assignees of Benford, F. A.). Aug. 24, 1923, [Convention date]. Lenses more particularly for use as condenser lenses in optical projection apparatus, are constructed with more than two sections 18, 20, 22, 24, formed by removing portions from the uncut lens along planes 16, 17, passing through the axis of projection and bringing the sections into contact as shown in Fig. 3. Each part of the lens so formed produces a separate and distinct image of the arc 2 at the gate 4, resulting in a greater evenness of illumination of the film 4<a>. Alternatively, two lenses A, B may be formed of two sections each, the lines of the sections being placed at right-angles. In further modifications the sections may be made at angles of 60‹ with one another or three split lenses may be used having the sections at 60‹ with each other. When formed of four sections the axes of the sections may be arranged along a line by only removing a portion of the lens only along one axis and simply cutting the lens along the axis at rightangles to that along which a portion of the lens was removed. The focal points of all the sections lie in a common focal plane.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US220961XA | 1923-08-24 | 1923-08-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB220961A true GB220961A (en) | 1925-01-22 |
Family
ID=21807788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19984/24A Expired GB220961A (en) | 1923-08-24 | 1924-08-23 | Improvements in and relating to lenses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB220961A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1101011B (en) * | 1955-02-07 | 1961-03-02 | Zeiss Ikon Ag | Optical device for projection purposes |
| US4029395A (en) * | 1975-10-31 | 1977-06-14 | Westinghouse Electric Corporation | Method for altering the focal zone of a lens system |
| US5182444A (en) * | 1989-06-12 | 1993-01-26 | Digital Equipment Corporation | Split lens displaced long from each other along plane of cut |
-
1924
- 1924-08-23 GB GB19984/24A patent/GB220961A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1101011B (en) * | 1955-02-07 | 1961-03-02 | Zeiss Ikon Ag | Optical device for projection purposes |
| US4029395A (en) * | 1975-10-31 | 1977-06-14 | Westinghouse Electric Corporation | Method for altering the focal zone of a lens system |
| US5182444A (en) * | 1989-06-12 | 1993-01-26 | Digital Equipment Corporation | Split lens displaced long from each other along plane of cut |
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