GB170560A - Improvements in or relating to apparatus for producing sound record films - Google Patents

Improvements in or relating to apparatus for producing sound record films

Info

Publication number
GB170560A
GB170560A GB23275/21A GB2327521A GB170560A GB 170560 A GB170560 A GB 170560A GB 23275/21 A GB23275/21 A GB 23275/21A GB 2327521 A GB2327521 A GB 2327521A GB 170560 A GB170560 A GB 170560A
Authority
GB
United Kingdom
Prior art keywords
circuit
amplifier
transformer
plate
light
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
GB23275/21A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB170560A publication Critical patent/GB170560A/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

  • Amplifiers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

170,560. Graaff, W., and Dresla, P. Oct. 16, 1920, [Convention date]. Thermionic amplifiers.-Relates to methods of recording and reproducing sounds by photographic means. In recording, the sounds received by a microphone a, Fig. 1, act across a transformer b to produce electric fluctuations in the grid circuit G of a thermionic tube amplifier, or several of these arranged in parallel, whereby amplified fluctuations are produced in the current in the plate circuit A, K of the amplifier, which circuit supplies the filament of a lamp d comprising an envelope filled with a rare gas. The light from a lamp d, Fig. 2, acts through a cylindrical lens e and slotted plate f on a continuously-moving sensitive film g. In reproducing, the developed film g, Fig. 3, is moved across a slit n on which a constant light k directed through a condenser l is focused by a cylindrical lens m, the light that passes through the film acting on a selenium cell i corresponding to the shape of the slit n. The cell i is in a circuit acting across a transformer o on the grid circuit of a preliminary amplifier comprising several thermionic tube amplifiers arranged in parallel, and the plate circuits of this act across a transformer on the grid circuits of a similar amplifier the plate circuits of which include a telephone receiver or the like.
GB23275/21A 1920-10-16 1921-09-01 Improvements in or relating to apparatus for producing sound record films Expired GB170560A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE170560X 1920-10-16

Publications (1)

Publication Number Publication Date
GB170560A true GB170560A (en) 1922-12-01

Family

ID=5688811

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23275/21A Expired GB170560A (en) 1920-10-16 1921-09-01 Improvements in or relating to apparatus for producing sound record films

Country Status (1)

Country Link
GB (1) GB170560A (en)

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