GB371990A - Improvements in optical projection cabinets - Google Patents
Improvements in optical projection cabinetsInfo
- Publication number
- GB371990A GB371990A GB507131A GB507131A GB371990A GB 371990 A GB371990 A GB 371990A GB 507131 A GB507131 A GB 507131A GB 507131 A GB507131 A GB 507131A GB 371990 A GB371990 A GB 371990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- support
- lid
- screen
- carried
- projection
- 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
- G03B21/14—Details
- G03B21/30—Details adapted to collapse or fold, e.g. for portability
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Projection Apparatus (AREA)
Abstract
371,990. Optical-projection apparatus. GRAMOPHONE CO., Ltd., and STANLEY, H. H. V., 79, North Hyde Road, both in Hayes, Middlesex. Feb. 17, 1931, No. 5071. [Class 97 (i).] A projection cabinet comprises a movable member, e.g. a hinged lid, permanently carrying a support for a projection screen, the support being movable relatively to the member, and both the support and member occupying different positions when the apparatus is in use and out of use. As shown, a hinged lid 7 carries a hinged support 12 having attached thereto one end of a silk or other fabric screen 13 carried by a roller 18. When the lid is lowered, the support 12 forms part of the front of the cabinet, and the screen is wound on the roller. The projector 4 is carried by a partition 2, and the light beam is reflected to the screen by a fixed mirror 5 and a mirror 10 carried by brackets 11 on the lid. Dark curtains may be provided to close in the lateral spaces formed by opening the lid, and an electrical amplifier and loudspeaker 19 may be housed in the cabinet.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB507131A GB371990A (en) | 1931-02-17 | 1931-02-17 | Improvements in optical projection cabinets |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB507131A GB371990A (en) | 1931-02-17 | 1931-02-17 | Improvements in optical projection cabinets |
Publications (1)
Publication Number | Publication Date |
---|---|
GB371990A true GB371990A (en) | 1932-05-05 |
Family
ID=9789207
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB507131A Expired GB371990A (en) | 1931-02-17 | 1931-02-17 | Improvements in optical projection cabinets |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB371990A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138160A (en) * | 1983-03-11 | 1984-10-17 | Jmc Compak Limited | Rear projection display apparatus |
-
1931
- 1931-02-17 GB GB507131A patent/GB371990A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2138160A (en) * | 1983-03-11 | 1984-10-17 | Jmc Compak Limited | Rear projection display apparatus |
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