GB500274A - Improvements in or relating to photo-phonographic apparatus - Google Patents

Improvements in or relating to photo-phonographic apparatus

Info

Publication number
GB500274A
GB500274A GB12414/37A GB1241437A GB500274A GB 500274 A GB500274 A GB 500274A GB 12414/37 A GB12414/37 A GB 12414/37A GB 1241437 A GB1241437 A GB 1241437A GB 500274 A GB500274 A GB 500274A
Authority
GB
United Kingdom
Prior art keywords
shutters
mask
operate
describes
photo
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
GB12414/37A
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Publication of GB500274A publication Critical patent/GB500274A/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

500,274. Optical sound-recording. RADIO CORPORATION OF AMERICA. April 30, 1937, No. 12414. Void. Convention date, May 29, 1936. [Class 40 (ii)] The Specification as open to inspection under Sect. 91 describes an optical sound recording apparatus comprising a mask 12, Fig. 1, and a pair of shutters 24, 25 controlled by the envelope current from an amplifier rectifier 6 for producing a double-hump sound track with "ground-noise " maskings similar to the apparatus described in Specification 494,114, and in addition describes extensions or additions to the main aperture of the mask 12 adapted to co-operate with prisms 18, 19 to throw a monitoring beam on a screen 20. The additional or extension aperture or apertures may take several forms as shown at M in Fig. 7, and may co-operate with one or both shutters 24, 25.
GB12414/37A 1936-05-29 1937-04-30 Improvements in or relating to photo-phonographic apparatus Expired GB500274A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US500274XA 1936-05-29 1936-05-29

Publications (1)

Publication Number Publication Date
GB500274A true GB500274A (en) 1939-02-06

Family

ID=21963004

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12414/37A Expired GB500274A (en) 1936-05-29 1937-04-30 Improvements in or relating to photo-phonographic apparatus

Country Status (1)

Country Link
GB (1) GB500274A (en)

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