GB514477A - Improvements relating to the optical projection of images - Google Patents
Improvements relating to the optical projection of imagesInfo
- Publication number
- GB514477A GB514477A GB1053938A GB1053938A GB514477A GB 514477 A GB514477 A GB 514477A GB 1053938 A GB1053938 A GB 1053938A GB 1053938 A GB1053938 A GB 1053938A GB 514477 A GB514477 A GB 514477A
- Authority
- GB
- United Kingdom
- Prior art keywords
- border
- image
- projection
- lens
- class
- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/13—Projectors for producing special effects at the edges of picture, e.g. blurring
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lenses (AREA)
Abstract
514,477. Optical-projection apparatus. BRITISH THOMSON-HOUSTON CO., Ltd., BOWEN, A., and WELCH, D. F. April 6, 1938, Nos. 10539 and 14334. [Class 97 (i)] Light producing on the screen, around a multi-coloured projected image, a border of a colour matching and changing with that of the image is obtained by selecting part of the light beam after it has passed through the normal projection lens system. As shown, a concave lens 15 with a central rectangular aperture is placed in front of the projection lens 13 and throws an unfocused image on a border 14 surrounding the normal image 12. A further, convex, lens with a rectangular aperture may be provided to focus the inner edge of the border on the screen. In a modification, the rays. forming the border may be separated by reflecting surfaces at substantially 45 degrees to the projection axis provided on a centrally apertured refractive block; the exit surface of the block may be embossed to spread the emerging rays. Specifications 208,798, [Class 97 (i)], 417,873 and 460,508 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1053938A GB514477A (en) | 1938-04-06 | 1938-04-06 | Improvements relating to the optical projection of images |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1053938A GB514477A (en) | 1938-04-06 | 1938-04-06 | Improvements relating to the optical projection of images |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB514477A true GB514477A (en) | 1939-11-09 |
Family
ID=9969680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1053938A Expired GB514477A (en) | 1938-04-06 | 1938-04-06 | Improvements relating to the optical projection of images |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB514477A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2305756A1 (en) * | 1975-03-28 | 1976-10-22 | Toda Shiro | Wide screen cine projection system - with additional visual effects encompassing walls or ceiling of auditorium |
| US4334743A (en) * | 1980-03-04 | 1982-06-15 | Datagraphix, Inc. | Optical arrangement for use in a microfiche reader and method |
-
1938
- 1938-04-06 GB GB1053938A patent/GB514477A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2305756A1 (en) * | 1975-03-28 | 1976-10-22 | Toda Shiro | Wide screen cine projection system - with additional visual effects encompassing walls or ceiling of auditorium |
| US4334743A (en) * | 1980-03-04 | 1982-06-15 | Datagraphix, Inc. | Optical arrangement for use in a microfiche reader and method |
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