Disc inclination detecting apparatus

Details Disc inclination detecting apparatus Disc inclination detecting apparatus

1987-09-08

1989-02-14

Sikes, William L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369258, G11B 390, G11B 2736

Patent

active

048051640

ABSTRACT:
A disc inclination detecting apparatus comprises a light-emitting element for projecting a light beam on a disc and a light-sensitive element for receiving a reflected light beam reflected by the disc and outputting a corresponding electric signal, in which the light-sensitive element faces the disc and is positioned together with the light-emitting element in a tangential direction of tracks on the disc. The apparatus also comprises a signal processing circuit for detecting, on the basis of the electric signal, a variation of a position of the reflected light beam on the light-sensitive element in a direction perpendicular to the tangential direction. The variation corresponds to an inclination angle of the disc.

REFERENCES:
patent: 4549190 (1985-10-01), O'Hare
patent: 4602359 (1986-07-01), Palmer
patent: 4682314 (1987-07-01), Nakagaki
patent: 4710908 (1987-12-01), Oshima

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