Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-07-14
1993-06-08
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369 4424, G11B 709
Patent
active
052185974
ABSTRACT:
A thruhole 23 is provided with a movable member so that a light beam irradiated from an LED passes through the thruhole and is received by a photo detector for positional detection whereby the position of an objective lens relative to the light receiving groove of an information recording medium is detected. At the same time, a light beam passing through the thruhole 46 and reflected by the information recording medium is received by a photo detector for inclination detection whereby the inclination angle of the objective lens against the information recording medium is detected.
REFERENCES:
patent: 4636628 (1987-01-01), Tsukai
patent: 4956833 (1990-09-01), Kokado et al.
patent: 5034941 (1991-07-01), Kasai et al.
patent: 5072437 (1991-12-01), Urikuma
Dzierzynski Paul M.
Mitsubishi Denki & Kabushiki Kaisha
Nguyen Kiet T.
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