Title:
OPTICAL INFORMATION READER
Document Type and Number:
Japanese Patent JPS5255547
Kind Code:
A
Abstract:
PURPOSE: In reading information from an optical information recording is intended to increase a signal-to-noise ratio throughout the overall area of a track by changing the shape of an irradiating beam in response to the position of the beam on the recording medium and the distance from it to the central point.
Inventors:
OSHIDA YOSHISADA
SAWANO SUSUMU
SAWANO SUSUMU
Application Number:
JP13046475A
Publication Date:
May 07, 1977
Filing Date:
October 31, 1975
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G02B27/00; G02B27/02; G11B7/08; G11B7/125; (IPC1-7): G02B27/02; G06F13/04; G11B7/08
Previous Patent: JPS5255546
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