GB461259A - Improvements in or relating to optical systems for use in recording and reproducing sound on films - Google Patents

Improvements in or relating to optical systems for use in recording and reproducing sound on films

Info

Publication number
GB461259A
GB461259A GB22792/35A GB2279235A GB461259A GB 461259 A GB461259 A GB 461259A GB 22792/35 A GB22792/35 A GB 22792/35A GB 2279235 A GB2279235 A GB 2279235A GB 461259 A GB461259 A GB 461259A
Authority
GB
United Kingdom
Prior art keywords
lens
film
short
length
aug
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
GB22792/35A
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.)
Kodak Ltd
Original Assignee
Kodak Ltd
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 Kodak Ltd filed Critical Kodak Ltd
Publication of GB461259A publication Critical patent/GB461259A/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

Abstract

461,259. Lenses. KODAK, Ltd. Aug. 13, 1935, No. 22792. Convention date, Aug. 18, 1934. [Class 97 (i)] [Also in Group XXXVIII] An optical system for use in sound recording or reproducing apparatus comprises a single lens for forming a reduced image of the light source on a film, the lens having a short focal length and having the face thereof which is the nearer to the source aspherically curved about axes at right-angles to the length of the film, so as to correct for spherical aberration. As shown, a short-focus lens 11, which images an elongated light source 10 on a film 12, is preferably made together with a block 17 from a single piece of glass, and has a front aspherical cylindrical surface 15 and a rear plane surface 16. The surface 15 is almost a parabola. Glass of low dispersion is used, to reduce chromatic aberration. Means such as a slotted diaphragm 13 are provided, to limit the length of the image. In the arrangement shown, the lens employed makes possible a very short over-all distance from the filament 10 to the film 12, and the lens may have a working aperture of F 1À0, with freedom from spherical aberration and a magnification ratio of twenty to one. Instead of the lamp filament 10, a slit illuminated through a condensing system may be provided. The proper curvature of the lens 11 is determined in accordance with a given formula.
GB22792/35A 1934-08-18 1935-08-13 Improvements in or relating to optical systems for use in recording and reproducing sound on films Expired GB461259A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US461259XA 1934-08-18 1934-08-18

Publications (1)

Publication Number Publication Date
GB461259A true GB461259A (en) 1937-02-15

Family

ID=21941759

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22792/35A Expired GB461259A (en) 1934-08-18 1935-08-13 Improvements in or relating to optical systems for use in recording and reproducing sound on films

Country Status (1)

Country Link
GB (1) GB461259A (en)

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