GB277303A - Improvements in or connected with the reproduction of recorded sound - Google Patents

Improvements in or connected with the reproduction of recorded sound

Info

Publication number
GB277303A
GB277303A GB20871/27A GB2087127A GB277303A GB 277303 A GB277303 A GB 277303A GB 20871/27 A GB20871/27 A GB 20871/27A GB 2087127 A GB2087127 A GB 2087127A GB 277303 A GB277303 A GB 277303A
Authority
GB
United Kingdom
Prior art keywords
slit
film
record
forest
recorded 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
GB20871/27A
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.)
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 GB277303A publication Critical patent/GB277303A/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

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

Abstract

277,303. De Forest Phonofilms, Ltd., (Assignees of Forest, L. de). Sept. 11, 1926, [Convention date]. Optical apparatus.-In apparatus for reproducing photographically-recorded sound, in which a relatively large slit 4 is situated between the light source 1 and the record film 6, and a relatively small slit 5 is placed between the film and the photo-electric cell 15, protective shields of transparent material, such as glass or mica, are placed on one or both sides of the slit 5. The slit 4 may be made of hard, polished steel, being in close proximity to or in contact with the film, while the slit 5 is arranged a short distance away from the film. A condensing lens or lenses 2 focus the light upon the slit 5, or, as shown in the Figure, upon the record itself. In the latter case, an enlarged image of the photographic sound record is thrown upon the slit 5, whereby the slit has a greater analysing power. The width of the slits 4, a may be about #in. and 0.001 in. respectively, the distance of the slit 5 from the film being of the order of #in. to “in.
GB20871/27A 1926-09-11 1927-08-08 Improvements in or connected with the reproduction of recorded sound Expired GB277303A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US277303XA 1926-09-11 1926-09-11

Publications (1)

Publication Number Publication Date
GB277303A true GB277303A (en) 1928-02-23

Family

ID=21839440

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20871/27A Expired GB277303A (en) 1926-09-11 1927-08-08 Improvements in or connected with the reproduction of recorded sound

Country Status (1)

Country Link
GB (1) GB277303A (en)

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