FR2441866A1 - Portable projector for transparencies - has battery operated lamp, film support slot and lenses housed in cylindrical telescopic hand-held casing - Google Patents
Portable projector for transparencies - has battery operated lamp, film support slot and lenses housed in cylindrical telescopic hand-held casingInfo
- Publication number
- FR2441866A1 FR2441866A1 FR7832129A FR7832129A FR2441866A1 FR 2441866 A1 FR2441866 A1 FR 2441866A1 FR 7832129 A FR7832129 A FR 7832129A FR 7832129 A FR7832129 A FR 7832129A FR 2441866 A1 FR2441866 A1 FR 2441866A1
- Authority
- FR
- France
- Prior art keywords
- cylinder
- transparencies
- batteries
- lamp
- film support
- 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.)
- Withdrawn
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
- G03B21/26—Projecting separately subsidiary matter simultaneously with main image
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
Abstract
The projector for transparencies includes two hollow cylindrical parts (A, B). The first part (A) houses four electric batteries (10) connected in series. These are held in place by internal ribs (11) formed integrally with the housing. To allow the batteries to be inserted, this part of the housing is made as two half shells (12, 13) held together by spring clips. The lower shell (12) also supports a lamp bulb (15) fitted into a screw socket (16). Wires (17) connect the lamp to the batteries via a switch (18) mounted in the upper surface of the cylinder. A reflector (21) separates the lamp from the batteries. At one end of the lower shell (12) are two plano-convex lenses (22) with their convex surfaces facing each other. The first cylinder (A) ends with two longitudinal ribs (23), defining a slot into which the transparency may be inserted. The second cylinder (8) has an internal dia. slightly greater than that of the first cylinder so that it may slide over it. This part houses a biconvex lens projecting an image of the transparency on to a distant screen.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832129A FR2441866A1 (en) | 1978-11-14 | 1978-11-14 | Portable projector for transparencies - has battery operated lamp, film support slot and lenses housed in cylindrical telescopic hand-held casing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7832129A FR2441866A1 (en) | 1978-11-14 | 1978-11-14 | Portable projector for transparencies - has battery operated lamp, film support slot and lenses housed in cylindrical telescopic hand-held casing |
Publications (1)
Publication Number | Publication Date |
---|---|
FR2441866A1 true FR2441866A1 (en) | 1980-06-13 |
Family
ID=9214857
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7832129A Withdrawn FR2441866A1 (en) | 1978-11-14 | 1978-11-14 | Portable projector for transparencies - has battery operated lamp, film support slot and lenses housed in cylindrical telescopic hand-held casing |
Country Status (1)
Country | Link |
---|---|
FR (1) | FR2441866A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5170196A (en) * | 1990-12-03 | 1992-12-08 | Sony Corporation | Portable projector |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE236217C (en) * | ||||
GB227502A (en) * | 1923-10-12 | 1925-01-12 | Stuart Cooper | Improvements in or relating to optical projection and cinematograph apparatus |
US2357542A (en) * | 1943-03-25 | 1944-09-05 | Melvin P Pfeil | Optical projection pointer |
US2717530A (en) * | 1952-07-09 | 1955-09-13 | Leta S Taylor | Projected optical image pointer |
-
1978
- 1978-11-14 FR FR7832129A patent/FR2441866A1/en not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE236217C (en) * | ||||
GB227502A (en) * | 1923-10-12 | 1925-01-12 | Stuart Cooper | Improvements in or relating to optical projection and cinematograph apparatus |
US2357542A (en) * | 1943-03-25 | 1944-09-05 | Melvin P Pfeil | Optical projection pointer |
US2717530A (en) * | 1952-07-09 | 1955-09-13 | Leta S Taylor | Projected optical image pointer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5170196A (en) * | 1990-12-03 | 1992-12-08 | Sony Corporation | Portable projector |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |