Dynamic information storage or retrieval – Specific detail of information handling portion of system
Patent
1992-10-29
1993-12-21
Dzierzynski, Paul M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
369 4428, 369 4429, 235454, G06K 710
Patent
active
052726886
ABSTRACT:
An apparatus for writing and/or reading information on and/or from an optical card including an optical head having a light source for emitting a light beam and an objective lens for projecting the light beam onto the optical card, a first VCM for driving the optical head in the track direction for effecting a coarse access, a second VCM for moving the optical card in the track direction, and a tracking actuator for moving the objective lens in the seek direction to effect a tracking control. When a desired track is to be accesses, at first the optical head is moved in the seek direction by said first VCM such that the light beam spot is made incident upon a track near the desired track, and then after the movement of the optical card by said second VCM has been judged to be stopped, a deviation of the position of the objective lens with respect to a reference position is detected. After said deviation has been judged to be smaller than a given value, said tracking actuator is driven to effect the track jump by a required number of times to project the light beam onto the desired track. In this manner, the track access can be performed correctly within a short time period without being affected by vibrations of the optical head and optical card and the track skew.
REFERENCES:
patent: 5105072 (1992-04-01), Saito et al.
patent: 5184338 (1993-02-01), Shimoda et al.
patent: 5204514 (1993-04-01), Horiguchi
patent: 5216650 (1993-06-01), Noguchi
Dzierzynski Paul M.
Olympus Optical Co,. Ltd.
Wong Don
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