Tilt-error detector

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium

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369119, 369 4424, G11B 712

Patent

active

053229932

ABSTRACT:
Tilt error detecting apparatus detects a surface tilt of a disc (26) and produces a tilt-error signal (TE) for servo control of optical pickup which is to follow the surface tilt. The apparatus has a movable portion (B) carrying an objective lens (16) for writing/reading optical information on/from a recording surface (26A) of the disc and a mirror (52) or a semi-transparent mirror (24) movable together with the objective lens, and a stationary portion (A) carrying a light beam source (10, 12, 14, 22, 50) for projecting a detection beam (LC.sub.1) to the recording surface through the mirror. The detection beam is reflected at the mirror like recording surface and forms a reflected beam (LC.sub.2). Aperture is provided on the stationary portion for passing a part of the reflected beam, the partly passed reflected beam is projected on a detector which produces the tilt-error signal depending on a position of a beam spot (LC3) produced thereon by the partly passed reflected beam. In one of the two embodiments, the semi-transparent mirror (24) directs the reflected beam toward the aperture.

REFERENCES:
patent: 4534021 (1985-08-01), Smith
patent: 4782474 (1988-11-01), Arai et al.
Japanese Laid Open Patent Application No. 137831/1991, published on Jun. 12, 1991.
Japanese Laid Open Utility Model Application No. 135817/1985, published on Sep. 9, 1985.
Japanese Laid Open Patent Application No. 44531/1990, published on Feb. 14, 1990.

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