GB215731A - Improvements relating to the reproduction of sound records - Google Patents

Improvements relating to the reproduction of sound records

Info

Publication number
GB215731A
GB215731A GB10098/24A GB1009824A GB215731A GB 215731 A GB215731 A GB 215731A GB 10098/24 A GB10098/24 A GB 10098/24A GB 1009824 A GB1009824 A GB 1009824A GB 215731 A GB215731 A GB 215731A
Authority
GB
United Kingdom
Prior art keywords
cell
record
film
slit
lens
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
GB10098/24A
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 GB215731A publication Critical patent/GB215731A/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

215,731. Poulsen, A., and Petersen, A. C. G., (Assignees of Willadsen, A. 0. S.). May 11, 1923, [Convention date]. Optical apparatus. - Relates to apparatus for reproducing sound from a film record by passing the film between a source of light and a photoelectric cell. According to the invention, an enlarged image of the illuminated portion of the record is formed directly on a linear light-sensitive cell, without the use of a slit between the record and the cell. In the apparatus shown, a film record 1 is illuminated through a lens 3, and an enlarged image of the illiiminated portion is formed by a lens 4 upon a selenium or like cell 7 of linear shape. The cell is arranged in the usual way in an electric circuit including a soundreproducer. The Specification, as open to inspection under Sect. 91 (3) (a), describes also an arrangement shown in Fig. 1 (Cancelled) in which a screen 5 having a slit 6 is inset, a magnified image of a part of the same record film 1 being produced on the screen by means of a light source 2 and lenses 3, 4. Light passing through the slit 6, which is adjusted in width according to the width of the sound signs in the image, is focussed by a lens 8 on a photo-electric cell 7. This subjectmatter does not appear in the Specification as accepted.
GB10098/24A 1923-05-11 1924-04-23 Improvements relating to the reproduction of sound records Expired GB215731A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK215731X 1923-05-11

Publications (1)

Publication Number Publication Date
GB215731A true GB215731A (en) 1925-02-12

Family

ID=8149995

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10098/24A Expired GB215731A (en) 1923-05-11 1924-04-23 Improvements relating to the reproduction of sound records

Country Status (1)

Country Link
GB (1) GB215731A (en)

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