GB280534A - Improvements relating to methods of and apparatus for sound recording - Google Patents

Improvements relating to methods of and apparatus for sound recording

Info

Publication number
GB280534A
GB280534A GB29533/27A GB2953327A GB280534A GB 280534 A GB280534 A GB 280534A GB 29533/27 A GB29533/27 A GB 29533/27A GB 2953327 A GB2953327 A GB 2953327A GB 280534 A GB280534 A GB 280534A
Authority
GB
United Kingdom
Prior art keywords
lens
source
lenses
directed
caused
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
Application number
GB29533/27A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB280534A publication Critical patent/GB280534A/en
Expired legal-status Critical Current

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

280,534. British Thomson-Houston Co.., Ltd., (Assignees of Hollnagel, H. P. Nov. 13, 1926, [Convention date]. Optical apparatus.-A photographic record of sound is produced by directing a beam of light on to a sensitized surface through a medium whose density is caused to vary by the sound waves themselves, whereby varying deflections of the beam are caused. As shown, a beam from a source 3 is focused by a lens 4 to a point 6 at which sounds from a source 11 are concentrated by a, cone 12, whereby the medium, air in this case. is alternately compressed and rarified and correspondingly defects the beam. which is directed through a lens 5 on to a travelling sensitized film 1. The lenses are preferably quartz or fluorite, and the lens 5 is preferably arranged nearer to the point 6 than to the film to effect magnification. Mirrors may be employed in. place of some of the lenses, and the source may emit any suitable ray. Reference has been directed by the Comptroller to Specification 282,469.
GB29533/27A 1926-11-13 1927-11-04 Improvements relating to methods of and apparatus for sound recording Expired GB280534A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US280534XA 1926-11-13 1926-11-13

Publications (1)

Publication Number Publication Date
GB280534A true GB280534A (en) 1928-10-25

Family

ID=21841307

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29533/27A Expired GB280534A (en) 1926-11-13 1927-11-04 Improvements relating to methods of and apparatus for sound recording

Country Status (1)

Country Link
GB (1) GB280534A (en)

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