GB367591A - Improvements in methods and devices for the electro-optical reproduction of photographic sound records - Google Patents

Improvements in methods and devices for the electro-optical reproduction of photographic sound records

Info

Publication number
GB367591A
GB367591A GB7939/31A GB793931A GB367591A GB 367591 A GB367591 A GB 367591A GB 7939/31 A GB7939/31 A GB 7939/31A GB 793931 A GB793931 A GB 793931A GB 367591 A GB367591 A GB 367591A
Authority
GB
United Kingdom
Prior art keywords
light
source
resistance
cell
directed
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
GB7939/31A
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.)
Pathe Cinema SA
Original Assignee
Pathe Cinema SA
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 Pathe Cinema SA filed Critical Pathe Cinema SA
Publication of GB367591A publication Critical patent/GB367591A/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

  • Television Signal Processing For Recording (AREA)

Abstract

367,591. Optical sound-reproducing apparatus. PATHE CINEMA, ANCIENS ETABLISSEMENTS PATHE FR—RES, 6, Rue Francoeur, Paris. March 14, 1931, No. 7939. Convention date, March 31, 1930. [Class 40 (ii).] In the reproduction of sound by a light beam directed through a photographic record on to a light-sensitive cell, provision is made for compensating automatically in the output circuit for fluctuations in the light source whether energized by an electric current or pressure gas. As shown, light from a source 1 is directed by a prism 12 and lens 6 through a photographic sound record 3 on to a lightsensitive cell 5 connected through an amplifier 8 to a speaker 9, and compensation for fluctuations in the source 1 is effected by connecting a light-sensitive resistance 10 in a shunt circuit from the cell 5 and subjecting this resistance to a beam from the source 1 directed through a prism 13. If desired the resistance 10 may be influenced from a separate source of light energized from the same electric or gas supply as the source 1, and an adjustable screen 11 of graduated opacity may be inserted in the path of the beam to the resistance 10 and adjusted to produce a minimum damping effect, subject to satisfactory compensation, on the output circuit of the cell 5.
GB7939/31A 1930-03-31 1931-03-14 Improvements in methods and devices for the electro-optical reproduction of photographic sound records Expired GB367591A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR367591X 1930-03-31

Publications (1)

Publication Number Publication Date
GB367591A true GB367591A (en) 1932-02-25

Family

ID=8894415

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7939/31A Expired GB367591A (en) 1930-03-31 1931-03-14 Improvements in methods and devices for the electro-optical reproduction of photographic sound records

Country Status (1)

Country Link
GB (1) GB367591A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420058A (en) * 1945-01-18 1947-05-06 Gen Aniline & Film Corp Compensated photoelectric photometer circuits
US2496959A (en) * 1947-01-08 1950-02-07 Eastman Kodak Co Photographic sound track scanning apparatus with light flicker compensation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420058A (en) * 1945-01-18 1947-05-06 Gen Aniline & Film Corp Compensated photoelectric photometer circuits
US2496959A (en) * 1947-01-08 1950-02-07 Eastman Kodak Co Photographic sound track scanning apparatus with light flicker compensation

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