公开(公告)号：CA1324662C

公开(公告)日：1993-11-23

申请号：CA603321

申请日：1989-06-20

Applicant: SONY CORP

Inventor： TANAKA TOORU ,  OTA KEIICHI ,  OSATO MAMORU

IPC: G11B21/08 ,  G11B25/04

Abstract: A disk recording and/or reproducing apparatus performs recording information on and/or reproducing information from a disk-like recording medium within a sealed receptacle by the use of a head. In the apparatus, an optical encoder for detecting positions of the head with respect to the disk-like recording medium has such a scale plate as to be swingable on the arm shaft of a head arm together with the head arm, as to have scale marks engraved in the radius direction of the arm shaft, and as to consist of a single member in whole, so that a trouble such as the head is off the track dut to a thermal influence and so forth, never occurs.

公开(公告)号：JP2508465B2

公开(公告)日：1996-06-19

申请号：JP22907086

申请日：1986-09-27

Applicant: SONY CORP

Inventor： MIZUTANI TAKESHI ,  TANAKA TOORU ,  SETO HIDEKAZU

IPC: G01B21/02 ,  G01D5/245 ,  G11B19/14 ,  G11B21/08