GB180296A - Improvements in and relating to methods of and apparatus for recording sound and like waves - Google Patents
Improvements in and relating to methods of and apparatus for recording sound and like wavesInfo
- Publication number
- GB180296A GB180296A GB2294/22A GB229422A GB180296A GB 180296 A GB180296 A GB 180296A GB 2294/22 A GB2294/22 A GB 2294/22A GB 229422 A GB229422 A GB 229422A GB 180296 A GB180296 A GB 180296A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mirror
- diaphragm
- film
- light
- oscillograph
- 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
Abstract
180,296. British Thomson - Houston Co., Ltd., (Assignees of Hoxie, C. A.). May 20, 1921, [Convention date]. Vibration, indicating; photographic recorders. -Relates to apparatus for recording sound and like waves photographically. In the apparatus shown in Figs. 1 and 3, sound to be recorded affects a diaphragm 17 in a transmitter 10, which diaphragm is connected to a mirror 18 by which a beam of light is reflected from a source 11 through a slit 12 on to a photo-electric cell 14. The cell is connected in the grid circuit of a thermionic valve 15 through a resistance coupling, the plate circuit of the valve including an electromagnet 16 which operates a diaphragm 19. A mirror 20 secured to this diaphragm reflects a second beam of light through a slit 40 in a casing containing a moving photographic film 39, on which an amplified record of the vibrations of the first beam of light corresponding to the sound waves is thus produced. The slits 12, 40 partially intercept the respective beams of light. Each mirror is connected to its diaphragm by rods 25, 26, Fig. 3, and is mounted on a triangular shaft 27 held in jewel bearings by a permanent magnet. The apparatus may be used for amplifying the vibrations of an oscillograph, for which purpose the oscillograph mirror is substituted for the mirror 18, and the mirror 20 and its actuating means may be replaced by a second oscillograph. The photo electric-cell is preferably of the kind described in Specification 190,218 [Class (39 (i). Electric lamps, Arc, &c.]. Fig. 5 shows a film having thereon a single record produced as described, though several such records may be made on one film. A rotating photographic plate may be used instead of a film. Specification 130,762 also is referred to. According to the Specification as open to inspection under Sect. 91 (3) (a), the amplifying- device may be dispensed with altogether, and the vibrations of the beam from the mirror 18 recorded directly. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US180296XA | 1921-05-20 | 1921-05-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB180296A true GB180296A (en) | 1923-07-25 |
Family
ID=21785857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2294/22A Expired GB180296A (en) | 1921-05-20 | 1922-01-25 | Improvements in and relating to methods of and apparatus for recording sound and like waves |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB180296A (en) |
-
1922
- 1922-01-25 GB GB2294/22A patent/GB180296A/en not_active Expired
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