GB263180A - Improvements in or relating to sound recording and reproducing apparatus - Google Patents

Improvements in or relating to sound recording and reproducing apparatus

Info

Publication number
GB263180A
GB263180A GB31998/26A GB3199826A GB263180A GB 263180 A GB263180 A GB 263180A GB 31998/26 A GB31998/26 A GB 31998/26A GB 3199826 A GB3199826 A GB 3199826A GB 263180 A GB263180 A GB 263180A
Authority
GB
United Kingdom
Prior art keywords
light
source
film
cell
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
GB31998/26A
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.)
FOREST PHONOFILMS Ltd DE
Original Assignee
FOREST PHONOFILMS Ltd DE
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 FOREST PHONOFILMS Ltd DE filed Critical FOREST PHONOFILMS Ltd DE
Publication of GB263180A publication Critical patent/GB263180A/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

  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

263,180. De Forest Phonofilms, Ltd., (Assignees of Forest, L. de). Dec. 19, 1925, [Convention date]. Optical apparatus for recording sound photographically or for reproducing sound photo-electrically from a record, instead of the usual slit interposed between a source of light and the film, there are provided three straightedged opaque bodies so arranged in different parallel planes as to permit of the passage of a very thin band of light between their adjacent edges. Fig. 1 shows the use in a recording-apparatus of such a device comprising two fixed members 7, 8 and an opposed member 9 which is adjustable by a screw 10. By this means an extremely thin band of light passes between the edges of the parts 7 - - 9 from the sound-influenced source of light 1 to the film 11. A soundreproducing apparatus to which the invention is applied is shown in Fig. 4, and comprises a lightsource 21 and a photo-electric cell 25, a system of plates 7 - - 9, as above described, being arranged between the source and the cell. The light passes to the cell 25 through a chamber 22 containing a diffusing lens 23. The travelling film record may be arranged in any of the positions indicated by the lines 11 - - 11<3>.
GB31998/26A 1925-12-19 1926-12-17 Improvements in or relating to sound recording and reproducing apparatus Expired GB263180A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US263180XA 1925-12-19 1925-12-19

Publications (1)

Publication Number Publication Date
GB263180A true GB263180A (en) 1927-02-24

Family

ID=21831140

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31998/26A Expired GB263180A (en) 1925-12-19 1926-12-17 Improvements in or relating to sound recording and reproducing apparatus

Country Status (1)

Country Link
GB (1) GB263180A (en)

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