GB501160A - Improvements in apparatus for the reproduction of sound films - Google Patents
Improvements in apparatus for the reproduction of sound filmsInfo
- Publication number
- GB501160A GB501160A GB2962037A GB2962037A GB501160A GB 501160 A GB501160 A GB 501160A GB 2962037 A GB2962037 A GB 2962037A GB 2962037 A GB2962037 A GB 2962037A GB 501160 A GB501160 A GB 501160A
- Authority
- GB
- United Kingdom
- Prior art keywords
- normal
- light
- slit
- optical
- prisms
- 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
501,160. Optical sound-reproducing apparatus. KOLB, 0. K. Oct. 29, 1937, No. 29620. [Class 40 (ii)] Relates to optical systems for use in souudfilm reproducing apparatus embodying a dual photo-electric device. According to the invention, " normal " sound-films may be utilized in such apparatus having a pair of lightsensitive elements disposed symmetrically about a central axis passing through the optical system and the scanning point, by so projecting a single light beam, serving to scan the entire sound track, that its axis is directed at an angle to the central axis in such manner that the beam falls on only one of the light-sensitive elements. A further feature of the invention consists in utilizing a uniaxial optical system for the reproduction of push-pull or asymmetric records, with the aid of two optical deflecting means serving to project two light pencils having non-parallel axes upon a film, so as to form thereon two half images of a slit, the pencils after traversing the film falling upon separate light-sensitive elements. This arrangement may also be used for reproducing from normal films when desired, by making the two deflecting means movable, so that only one of such members may be operative, and may then deflect the light beam, undivided, on to only one of the light-sensitive elements. Fig. 1 shows a system as first described above, in which for reproducing from a normal soundrecord 6, a beam from a lamp 1 is deflected upwards by a prism 3, in close proximity to a slit 4. An objective 5 forms a linear image 6c extending across the sound track, and the light passes on to only one (7b) of the two cathodes of the'twin-cathode cell 7. In the' apparatus shown in Fig. 3, which is adapted either for use with a push-pull record as shown, or with a normal record, the optical system comprises, in addition to lenses 2, 5, two prisms 3a, 3b, one of which is inverted relatively to the 'other. The prisms, which are arranged close to a slit 4, are mounted in a holder 3c which is laterally adjustable by means of a screw and nut so that the centred plane dividing the prisms may be made to lie on the central optical axis of the system. With this setting, two closely adjacent half images 6a, 6b, of the slit are formed in alignment with each other on the two tracks of the record, and the light passes in oppositely inclined pencils on to the two cathodes 7a, 7b, respectively of the photo-electric cell. A base 3g, on which the holder 3c is mounted, may be held in either of two positions by means of a catch 3h. In the position 'alternative to that shown, the prism 3a covers the entire slit 4, and the apparatus then functions as shown in Fig. 1, when used with a normal record. A modification is described, Fig. 2 (not shown), in which the two deflecting prisms are arranged with their apices together, and the two cathodes of the cell are side by side. Arrangements such as shown in Figs. 2 and 3 may be used in association with a system as described in Specification 462,195, for use with normal or asymmetric records alternatively.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2962037A GB501160A (en) | 1937-10-29 | 1937-10-29 | Improvements in apparatus for the reproduction of sound films |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2962037A GB501160A (en) | 1937-10-29 | 1937-10-29 | Improvements in apparatus for the reproduction of sound films |
Publications (1)
Publication Number | Publication Date |
---|---|
GB501160A true GB501160A (en) | 1939-02-22 |
Family
ID=10294441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2962037A Expired GB501160A (en) | 1937-10-29 | 1937-10-29 | Improvements in apparatus for the reproduction of sound films |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB501160A (en) |
-
1937
- 1937-10-29 GB GB2962037A patent/GB501160A/en not_active Expired
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