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
GB21094/30A
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.)
Zeiss Ikon AG
Original Assignee
Zeiss Ikon AG
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 Zeiss Ikon AGfiledCriticalZeiss Ikon AG
Publication of GB340924ApublicationCriticalpatent/GB340924A/en
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
Silver Salt Photography Or Processing Solution Therefor
(AREA)
Abstract
340,924. Reproducing recorded sound. ZEISS IKON AKT.-GES., 72, Schandauerstrasse, Dresden, Germany. July 11, 1930, No. 21094. Convention date, July 29, 1929. [Class 40 (ii).] Optical apparatus.-A photographic sound record is illuminated during reproduction by a vertical incandescent filament the image of the latter being rotated so as to fall upon the sound record in an horizontal position. The rotation of the image may be obtained by inserting a Dove prism 2 in the light rays passing from the vertical filament of a lamp 1 to the sound record. The Dove prism may be replaced by a three-sided prism or by other optical means such as crossed cylindrical lenses, mirrors, or combinations thereof.
GB21094/30A1929-07-291930-07-11Improvements in or relating to illumination of sound films
ExpiredGB340924A
(en)