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Title:
POLITICAL DEVICE FOR INFORMATION REPRODUCTION
Document Type and Number:
Japanese Patent JPS51144203
Kind Code:
A
Abstract:

PURPOSE: Information signal and tracking signal are detected by at least one laser light source, and the signal for automatic focussing are detected by another coherent light source, allowing the reduction of light loss from light sources and the simple constitution of optical systems.


Inventors:
TSUNODA YOSHITO
MAEDA TAKESHI
OSHIDA YOSHISADA
Application Number:
JP1975000067643
Publication Date:
December 11, 1976
Filing Date:
June 06, 1975
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
G02B27/00; G02B27/09; G11B7/00; H04N5/85; G11B7/005; G11B7/09; G11B7/12; (IPC1-7): G02B27/00; G11B7/00; H04N5/84
Domestic Patent References:
JPS48101927A1973-12-21



 
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