Optical tracking apparatus

Details Optical tracking apparatus Optical tracking apparatus

1981-05-07

1983-10-04

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369219, 369222, G11B 700, G11B 2110

Patent

active

044083114

ABSTRACT:
An optical tracking apparatus for tracing a spiral track on a recording disk includes an optical pickup device having a semiconductor laser and a photoelectric conversion element; an arm device pivotally mounted to an arm shaft with the pickup device being mounted to the free end thereof to thereby move substantially along the radial direction of the recording disk; sectorial arm drive coil attached to a rear end portion of the arm device and having a current path loop in parallel with the rotational plane of the arm device; and a pair of stationary magnetic field forming devices, each formed of a respective yoke and permanent magnet assembly, the yokes having respective air gaps in which magnetic fields in opposite directions to each other are formed, the arm drive coil being arranged to move in the air gaps and being supplied with an arm drive signal and a tracking error correction signal for causing the pickup device to trace the track.

REFERENCES:
patent: 4004081 (1977-01-01), Zorn
patent: 4214757 (1980-07-01), Kusaka et al.

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