GB517803A - Improvements in apparatus for the reproduction of sound films - Google Patents
Improvements in apparatus for the reproduction of sound filmsInfo
- Publication number
- GB517803A GB517803A GB1476239A GB1476239A GB517803A GB 517803 A GB517803 A GB 517803A GB 1476239 A GB1476239 A GB 1476239A GB 1476239 A GB1476239 A GB 1476239A GB 517803 A GB517803 A GB 517803A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slit
- prism
- sound
- cell
- reproduction
- 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
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
517,803. Optical sound-reproducing apparatus. KOLB, O. K. May 17, 1939, No. 14762. Addition to 501,218. [Class 40 (ii)] Apparatus for reproducing either from asymmetric (push-pull) or normal sound film records, as described in the parent Specification, is modified by providing in the optical system a single prism which is utilized for dividing the beam when a push-pull record is being employed, and which is rendered ineffective when the reproduction is from a normal record. In the arrangement, Fig. 1, an image of the sound track on a film 2 is formed on a slit (not shown) provided in a mask at the back of a lens 6. The slit may be made by engraving in a metallic layer on the lens. A prism 7 extends over half the slit, and is integral with a parallel-sided glass block 11. In the position of the parts shown (or alternatively, with the prism in close contact with the lower half of the slit and the upper half uncovered), the modulated light beam is split so that half of it falls on the cathode of a cell 9 and the other half on the cathode of a cell 9<1>. This enables push-pull reproduction to be effected. For use with a film having a normal sound-track, the prism is displaced or otherwise rendered ineffective, so that the slit is either uncovered or covered only by parallel-sided glass. By this means, the whole of the modulated beam is caused to fall on the cell 9<1>.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1476239A GB517803A (en) | 1939-05-17 | 1939-05-17 | Improvements in apparatus for the reproduction of sound films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1476239A GB517803A (en) | 1939-05-17 | 1939-05-17 | Improvements in apparatus for the reproduction of sound films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB517803A true GB517803A (en) | 1940-02-08 |
Family
ID=10047036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1476239A Expired GB517803A (en) | 1939-05-17 | 1939-05-17 | Improvements in apparatus for the reproduction of sound films |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB517803A (en) |
-
1939
- 1939-05-17 GB GB1476239A patent/GB517803A/en not_active Expired
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