GB347262A - Improvements in or relating to apparatus for reproducing sound - Google Patents

Improvements in or relating to apparatus for reproducing sound

Info

Publication number
GB347262A
GB347262A GB239630A GB239630A GB347262A GB 347262 A GB347262 A GB 347262A GB 239630 A GB239630 A GB 239630A GB 239630 A GB239630 A GB 239630A GB 347262 A GB347262 A GB 347262A
Authority
GB
United Kingdom
Prior art keywords
film
slots
backing device
optical
sound
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
GB239630A
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
Marconi 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 Marconis Wireless Telegraph Co Ltd, Marconi Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Priority to GB239630A priority Critical patent/GB347262A/en
Publication of GB347262A publication Critical patent/GB347262A/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

  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

347,262. Optical sound-reproducing apparatus. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., Marconi House, Strand, and ROUND, H. J., Westfield, Muswell Hill, both in London. Jan. 23, 1930, No. 2396. [Class 40 (ii).] Optical sound-reproducing apparatus for use with film records comprises one or more optical tubes arranged within or behind a corresponding number of slots in a roller or other backing device for the film, such tubes being adapted to transmit light projected through the slot or slots along a confined path to desired points exterior to the backing device. The backing device may take the form of a sprocket wheel 1 which is provided with two slots 2 for receiving glass or quartz rods 3. Light from a source 6 is focused on to the record on a film 5 and is transmitted through the rods 3 to a photoelectric cell 4. If desired, a photo-electric cell may be provided for each rod 3. Instead of a slotted roller, there may be provided a plurality of separate rollers spaced apart on a common shaft. The glass or quartz rod transmission system may also be employed with an ordinary sound gate.
GB239630A 1930-01-23 1930-01-23 Improvements in or relating to apparatus for reproducing sound Expired GB347262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB239630A GB347262A (en) 1930-01-23 1930-01-23 Improvements in or relating to apparatus for reproducing sound

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB239630A GB347262A (en) 1930-01-23 1930-01-23 Improvements in or relating to apparatus for reproducing sound

Publications (1)

Publication Number Publication Date
GB347262A true GB347262A (en) 1931-04-23

Family

ID=9738814

Family Applications (1)

Application Number Title Priority Date Filing Date
GB239630A Expired GB347262A (en) 1930-01-23 1930-01-23 Improvements in or relating to apparatus for reproducing sound

Country Status (1)

Country Link
GB (1) GB347262A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2621056A1 (en) * 1975-05-13 1976-12-02 Rank Organisation Ltd MULTI-STANDARD SOUND FILM REPLAYER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2621056A1 (en) * 1975-05-13 1976-12-02 Rank Organisation Ltd MULTI-STANDARD SOUND FILM REPLAYER

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