GB468704A - Improvements in and relating to optical systems for use with sound film - Google Patents

Improvements in and relating to optical systems for use with sound film

Info

Publication number
GB468704A
GB468704A GB74936A GB74936A GB468704A GB 468704 A GB468704 A GB 468704A GB 74936 A GB74936 A GB 74936A GB 74936 A GB74936 A GB 74936A GB 468704 A GB468704 A GB 468704A
Authority
GB
United Kingdom
Prior art keywords
lens
light
film
track
stop
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
GB74936A
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to GB74936A priority Critical patent/GB468704A/en
Publication of GB468704A publication Critical patent/GB468704A/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 Head (AREA)

Abstract

468,704. Optical sound recording or reproducing. KODAK, Ltd. (Eastman Kodak Co.) Jan. 9, 1936, No. 749. [Class 40 (ii)] In order that a light beam in a sound recording or reproducing apparatus may be focused accurately on to a record track. or photographic layer which may be on the near or far surface of the film, without adjusting the lens system, one or more supplementary optical elements each having two predetermined settings is or are provided. As shown, the lens system 1 focuses the light-beam on to a track 2 on the far side of the film 3, but if the track is on the near side of the film, the supplementary lens 5 carried by an arm pivoted at 6 is swung against a stop 8 into the path of the light-beam, the lens 5 being such as to effect the required variation in the focal point. A stop 7 determines the setting of the lens carrying arm in inoperative position. The optical element 5 may be a negative lens, a piece of glass with plane parallel faces, or a combination of prisms, e.g. a pair of right-angled prisms relatively adjustable to vary the thickness through which the light passes.
GB74936A 1936-01-09 1936-01-09 Improvements in and relating to optical systems for use with sound film Expired GB468704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB74936A GB468704A (en) 1936-01-09 1936-01-09 Improvements in and relating to optical systems for use with sound film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB74936A GB468704A (en) 1936-01-09 1936-01-09 Improvements in and relating to optical systems for use with sound film

Publications (1)

Publication Number Publication Date
GB468704A true GB468704A (en) 1937-07-09

Family

ID=9709848

Family Applications (1)

Application Number Title Priority Date Filing Date
GB74936A Expired GB468704A (en) 1936-01-09 1936-01-09 Improvements in and relating to optical systems for use with sound film

Country Status (1)

Country Link
GB (1) GB468704A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554679A (en) * 1948-01-30 1951-05-29 Mitchell Camera Corp Focus adjustment for motionpicture sound pickups

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2554679A (en) * 1948-01-30 1951-05-29 Mitchell Camera Corp Focus adjustment for motionpicture sound pickups

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