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
GB4531/29A
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.)
SELEN STUDIEN ERZEUGUNGS U VER
Original Assignee
SELEN STUDIEN ERZEUGUNGS U VER
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 SELEN STUDIEN ERZEUGUNGS U VERfiledCriticalSELEN STUDIEN ERZEUGUNGS U VER
Publication of GB333544ApublicationCriticalpatent/GB333544A/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
Optical Recording Or Reproduction
(AREA)
Thermal Transfer Or Thermal Recording In General
(AREA)
Manufacturing Optical Record Carriers
(AREA)
Abstract
333,544. Selen Studien Erzeugungsu. Verwertungs-Ges. Oct. 25, 1928, [Convention date]. Void [Published under Sect. 91 of the Acts]. Optical apparatus.- A small transverse field 7, Fig. 3, of an opaque copy 4 of a sound film is illuminated by incident light from a light source 1 through a lens 2, the light then being reflected on to a selenium or like cell 5, a lens 6 and prism or a visor being used if desired in the reflection. In Fig. 4, a single lens is shown for both incidence and reflection, part of the lens being cut off from full incidence by the reflecting prism 3. A broader band 8, -t'ig. 5, of film may be illuminated from a light source, the reflection being collected on to a narrow selenium cell by a lens 6.
GB4531/29A1928-10-251929-02-11Process of and apparatus for reproducing sounds recorded on sound films
ExpiredGB333544A
(en)
Procedure and device for the continuous evaluation of paste quality and/or polishing of a transparent sheet (Machine-translation by Google Translate, not legally binding)