GB362789A - Device for projecting pictures to variable sizes - Google Patents
Device for projecting pictures to variable sizesInfo
- Publication number
- GB362789A GB362789A GB657631A GB657631A GB362789A GB 362789 A GB362789 A GB 362789A GB 657631 A GB657631 A GB 657631A GB 657631 A GB657631 A GB 657631A GB 362789 A GB362789 A GB 362789A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lens
- lens systems
- projection
- preston
- reciprocated
- 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
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Overhead Projectors And Projection Screens (AREA)
Abstract
362,789. Optical - projection apparatus. PRESTON TYRE RERUBBERING CO., Ltd. and TOWERS, J. A., 72A, Friargate, Preston, and NEUSTADT, E., 228, Kurfurstendamm, Berlin. March 3, 1931, No. 6576. [Class 97 (i).] An optical projection-apparatus of the kind having movable lens systems adapted to enable the degree of magnification to be varied during the operation of the apparatus, whilst maintaining the image in focus, is characterized in that the movable lens systems are actuated automatically by mechanism adapted when driven continuously in one direction to move the lens systems repeatedly towards and from one another and the projection screen. As shown, the projection apparatus comprises a lamp 2, a condenser 3, and a transparency 4 projected on the screen 7 through the pair of lenses or lens systems 5, 6 displaceably mounted on the pillars 8, 9 respectively. The lens 5 is reciprocated by the co-operation of the roller 12, depending from the arm 14, carrying the lens 5, with the cam 10, the portion 10<1> of which is equidistant at all points from the axis. The lens 6 is reciprocated by the tension member 11 attached to the pulley 16 which is connected to a pinion 18 engaged alternately by the toothed segments 19, 20 operated by belts or chains from the shaft of the cam 10. The pulley 16 is provided with a friction brake 17.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB657631A GB362789A (en) | 1931-03-03 | 1931-03-03 | Device for projecting pictures to variable sizes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB657631A GB362789A (en) | 1931-03-03 | 1931-03-03 | Device for projecting pictures to variable sizes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB362789A true GB362789A (en) | 1931-12-10 |
Family
ID=9817001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB657631A Expired GB362789A (en) | 1931-03-03 | 1931-03-03 | Device for projecting pictures to variable sizes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB362789A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3059534A (en) * | 1959-01-08 | 1962-10-23 | Alois Handler | Adjusting device for an objective |
| US3062102A (en) * | 1959-11-25 | 1962-11-06 | Eastman Kodak Co | Mechanism for operation of zoom lens |
-
1931
- 1931-03-03 GB GB657631A patent/GB362789A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3059534A (en) * | 1959-01-08 | 1962-10-23 | Alois Handler | Adjusting device for an objective |
| US3062102A (en) * | 1959-11-25 | 1962-11-06 | Eastman Kodak Co | Mechanism for operation of zoom lens |
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