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公开(公告)号：JPS52109954A
公开(公告)日：1977-09-14
申请号：JP2631076
申请日：1976-03-11
Applicant: SONY CORP
Inventor： MIYAOKA CHISATO
Abstract: PURPOSE:To enable a satisfactory reading irrespective of changes in the surface of a recording medium, by providing a third lens system in such a way that a plane apart from a second lens system by its focal distance and a light detection plane has a image focusing relation to each other.
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