Optical recording and reproducing apparatus

Details Optical recording and reproducing apparatus Optical recording and reproducing apparatus

1986-10-16

1987-11-10

Cardillo, Raymond F.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 360 59, 365122, G11B 503, G11B 712, G11B 1114, G11B 1304

Patent

active

047062320

ABSTRACT:
The optical recording and reproducing apparatus comprises a magnetic field applying section, a movable mechanism for moving the magnetic field applying section, a distance detecting section for detecting a distance between magnetic poles of the magnetic field applying section and the surface of a recording medium, and a distance control section for maintaining the above distance constant in response to an output of the distance detecting section. The distance between two magnetic pole ends of the magnetic field applying section can be minimized. Further, on the basis of the tracking control of either one of the recording and erasing light beams, it is possible to enable a high-precision tracking control to the other of the two light beams.

REFERENCES:
patent: 3775570 (1973-11-01), Lewicki et al.
patent: 4363052 (1982-12-01), Hanaoka
patent: 4558440 (1985-12-01), Tomita
Yamada et al., "Erasable Optical Disc Using TeOx Thin Film", Proceedings of Japan Display '83, pp. 40-48.

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