Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-04-29
1993-09-21
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4415, 369 4423, G11B 7095
Patent
active
052475034
ABSTRACT:
A fixed section of an optical recording and reproducing apparatus is provided with an actuator for optically controlling the fine tracking of a laser beam to be held at a predetermined position, by moving a diverging convex lens of a relay lens in a direction perpendicular to that of the optical axis; first and second filter circuits for separating a tracking error signal outputted from a differential amplifier connected to a two-split light-receiving element into a high-frequency-side signal and a low-frequency-side signal respectively; a first driving control circuit for controlling the driving of a linear motor for moving a movable section of the apparatus on the basis of the low-frequency-side signal separated by the first filter circuit; and a second driving control circuit for controlling the driving of the actuator on the basis of the high-frequency-side signal separated by the second filter circuit.
REFERENCES:
patent: 4613961 (1986-09-01), Aarts
patent: 4688201 (1987-08-01), Towner et al.
patent: 4783774 (1988-11-01), Enomoto
patent: 5105408 (1992-04-01), Lee et al.
The 36th Meeting of the Japan Society of Applied Physics, 2p-ZB-5 and 2p-ZB-6, 1989, p. 905.
Iguchi Daisuke
Murakami Akemi
Nomiyama Takashi
Ueyanagi Kiichi
Yamaguchi Shoji
Fuji 'Xerox Co., Ltd.
Young W. R.
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