Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1993-02-25
1994-06-21
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
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.
Dzierzynski Paul M.
Meller Michael N.
Nguyen Kiet T.
Victor Company of Japan Ltd.
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