GB520275A - Improvements in sound recording - Google Patents
Improvements in sound recordingInfo
- Publication number
- GB520275A GB520275A GB3182/40A GB318240A GB520275A GB 520275 A GB520275 A GB 520275A GB 3182/40 A GB3182/40 A GB 3182/40A GB 318240 A GB318240 A GB 318240A GB 520275 A GB520275 A GB 520275A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lamps
- circuit
- lamp
- input circuit
- resistances
- 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
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
520,275. Optical sound-recording. KODAK, Ltd. Oct. 13, 1938. No. 3182/40. Convention date, Oct. 13, 1937. Divided out of 520,156. [Class 40 (ii)] An electric circuit for class B push-pull variable-density sound-on-film recording comprises an input circuit such as a transformer 12, two three-electrode glow discharge lamps 52, 53, means connecting a pair of electrodes 54, 56 of one of said lamps across a portion of the input circuit, means connecting a pair of electrodes of the other of said lamps across another portion of the input circuit, one or more sources of potential biasing said pairs oppositely just below the extinction point, and means including the third electrode 58 maintaining a glow in each lamp. In the circuit, Fig. 1, the lamps are connected to two separate secondaries 26, 27 of the transformer each lamp circuit having two biasing batteries 66, 68 and three resistances 34, 64, 60. In the preferred circuit, Fig. 2, the lamps are connected across the two halves 26, 27 of a tapped secondary, a single battery 62 with a tapping connected to the mid point of the secondary serves for all the bias potentials, and only two resistances 34, 60 are required for each lamp.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US520275XA | 1937-10-13 | 1937-10-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB520275A true GB520275A (en) | 1940-04-18 |
Family
ID=21974949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3182/40A Expired GB520275A (en) | 1937-10-13 | 1938-10-13 | Improvements in sound recording |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB520275A (en) |
-
1938
- 1938-10-13 GB GB3182/40A patent/GB520275A/en not_active Expired
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