GB533037A - Improved method for the mechanical recording of sound - Google Patents
Improved method for the mechanical recording of soundInfo
- Publication number
- GB533037A GB533037A GB22922/39A GB2292239A GB533037A GB 533037 A GB533037 A GB 533037A GB 22922/39 A GB22922/39 A GB 22922/39A GB 2292239 A GB2292239 A GB 2292239A GB 533037 A GB533037 A GB 533037A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sound
- upper layer
- cut
- film
- cutting properties
- 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
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Abstract
533,037. Mechanically recorded optically reproduced sound records. PHILIPS LAMPS, Ltd. Aug. 8, 1939, No. 22922. Convention date, Aug. 10, 1938. [Class 40 (ii)] A mechanically cut sound record for optical reproduction comprises at least two cutting layers, the upper layer 24, Fig. 3, having good cutting properties and a thickness of less than 30 microns, and the lower layer 23 having substantially worse cutting properties, a superficial blackening 25 being formed on the upper layer by chemical agency either before or after the cutting operation. By good cutting properties is meant the production of a sharp edge where the material is cut. The upper layer may be of gelatine and the lower layer of a cellulose derivative. The blackening may be obtained as described in Specification 483,898, for example by the addition of lead acetate to the gelatine upper layer, which is then treated with ammonium sulphide to produce a black surface layer of lead sulphide. A combined sound and picture film is made on a photo-sensitive commercial film as follows. The picture is exposed while the sound track is not. The film is developed and fixed, leaving a clear sound track. This clear sound track is then blackened and cut.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL533037X | 1938-08-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB533037A true GB533037A (en) | 1941-02-05 |
Family
ID=19787162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22922/39A Expired GB533037A (en) | 1938-08-10 | 1939-08-08 | Improved method for the mechanical recording of sound |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB533037A (en) |
-
1939
- 1939-08-08 GB GB22922/39A patent/GB533037A/en not_active Expired
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