GB779308A - Improvements in and relating to the projection of mosaic pictures - Google Patents
Improvements in and relating to the projection of mosaic picturesInfo
- Publication number
- GB779308A GB779308A GB18122/55A GB1812255A GB779308A GB 779308 A GB779308 A GB 779308A GB 18122/55 A GB18122/55 A GB 18122/55A GB 1812255 A GB1812255 A GB 1812255A GB 779308 A GB779308 A GB 779308A
- Authority
- GB
- United Kingdom
- Prior art keywords
- light
- reflectors
- projector
- cells
- amount
- 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
- G03B21/20—Lamp housings
-
- 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
- G03B37/00—Panoramic or wide-screen photography; Photographing extended surfaces, e.g. for surveying; Photographing internal surfaces, e.g. of pipe
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Projection Apparatus (AREA)
Abstract
779,308. Optical projection apparatus. VITARAMA CORPORATION. June 22, 1955 [July 21, 1954], No. 18122/55. Class 97(1) [Also in Group XL(b)] Apparatus comprising at least two projectors for projecting separate images so that they meet or overlap on a screen, includes means for maintaining the amount of light in the marginal portions of each light beam and responding to a change in said amount of light so as automatically to vary the amount of light means passing from the light source of at least one projector to the marginal portions of the image projected thereby so as to obtain a predetermined illumination intensity in the adjacent or overlapping portions of the separate images. The apparatus shown comprises projectors 9, 10 and 11 which form overlapping images on a screen 12 and include pairs of photo-cells 13, 19; 21, 22; and 24, 25 on to which light passing to the opposite sides of the respective film gates is reflected. Each photo-cell is connected through an amplifier 41 and one end of a differential relay 42 to servomotors 27, 28; 31. 32; and 34, 35. The other end of each relay 42 is connected to a reference signal source such as a signal generator 45. These servomotors serve to operate reflectors in each projection so as to vary the amount of light passing through one or other or both sides of the film gate or the associated projector when the light received by the respective cell differs from the reference intensity as determined by the signal from generator 45 Thus, in Fig. 4, the servomotors 27, 28 associated with the cells 18, 19 of one projector 9 serve to move axially two spheroidal reflectors 103, 104 which combine with a main reflector 98 and parabolic side reflectors 111, 112 to project light from a carbon arc 96 on to the film in gate 102. Alternatively, the motors may move angularly two pivoted reflectors as in Fig. 5 (not shown). The light may be reflected on to the photo-cells by reflectors disposed at opposite sides of the film gate or by reflecting strips or discs on the shutter of the projector as in Fig. 6 (not shown). In another form, Fig. 2 (not shown) the signal determining the reference intensity is provided by the output of the cells associated with reflector 10.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US779308XA | 1954-07-21 | 1954-07-21 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB779308A true GB779308A (en) | 1957-07-17 |
Family
ID=22140856
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB18122/55A Expired GB779308A (en) | 1954-07-21 | 1955-06-22 | Improvements in and relating to the projection of mosaic pictures |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB779308A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2122385A (en) * | 1982-06-18 | 1984-01-11 | Reichert Optische Werke Ag | Brightness-control apparatus for a system for reflecting images into a microscope |
GB2156541A (en) * | 1984-03-23 | 1985-10-09 | Philips Electronic Associated | Graticule illuminator for a night sight |
-
1955
- 1955-06-22 GB GB18122/55A patent/GB779308A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2122385A (en) * | 1982-06-18 | 1984-01-11 | Reichert Optische Werke Ag | Brightness-control apparatus for a system for reflecting images into a microscope |
GB2156541A (en) * | 1984-03-23 | 1985-10-09 | Philips Electronic Associated | Graticule illuminator for a night sight |
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