GB549645A - Improvements in or relating to duplex optical projection apparatus - Google Patents
Improvements in or relating to duplex optical projection apparatusInfo
- Publication number
- GB549645A GB549645A GB6788/41A GB678841A GB549645A GB 549645 A GB549645 A GB 549645A GB 6788/41 A GB6788/41 A GB 6788/41A GB 678841 A GB678841 A GB 678841A GB 549645 A GB549645 A GB 549645A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blades
- projection apparatus
- pivoted
- rollers
- shaped member
- 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
- G03B23/00—Devices for changing pictures in viewing apparatus or projectors
- G03B23/18—Devices for changing pictures in viewing apparatus or projectors with fade-in and fade-out effects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
Abstract
549,645. Optical-projection apparatus. KODAK, Ltd. May 27, 1941, No. 6788. 'Convention date, July 25, 1940. [Class 97 (i)] Change-over shutters for two projection apparatus are operatively connected with driving means causing one shutter to open and the other to close with simple harmonic motion, so that the screen brightness is substantially constant during the change-over. As shown, the members of each of two pairs of shutter blades 31, 33, and 48, 56 respectively, move laterally towards one another to meet centrally in one beam while those in the other'beam move apart, an'd vice versa. 'The blades 31, 33 are respectively carried by parallel bars 24, 27 pivoted to_parallel arms 16, 17 centrally carried on pivots 18, 19. A spring 42 connects the arms 16, 17, to maintain engagement between an L-shaped member 38, pivoted thereon, and one or both of two rollers 69, 70, mounted near opposite ends of a diameter on a rotatably driven disc 68. Similar members are provided in connection with the blades 48, 56 to maintain an L-shaped member 60 in engagement with one or both of rollers 71, 72 mounted near opposite ends of a diameter on the other side of the disc 68. The two diameters are at right angles to one another, with the result that the phase difference of the harmonic motions of the blades in the two beams is 90 degrees and the illumination of the screen during the changeover is substantially constant.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US549645XA | 1940-07-25 | 1940-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB549645A true GB549645A (en) | 1942-12-01 |
Family
ID=21994661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6788/41A Expired GB549645A (en) | 1940-07-25 | 1941-05-27 | Improvements in or relating to duplex optical projection apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB549645A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988000360A1 (en) * | 1986-07-03 | 1988-01-14 | Thiebeaux Jean Claude | Apparatus for projections of slides |
-
1941
- 1941-05-27 GB GB6788/41A patent/GB549645A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988000360A1 (en) * | 1986-07-03 | 1988-01-14 | Thiebeaux Jean Claude | Apparatus for projections of slides |
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