Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-08-22
1997-02-18
Hindi, Nabil
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4427, 369 32, G11B 700
Patent
active
056047223
ABSTRACT:
In an access control method, a light spot is formed on a disk and a track-crossing signal is detected from light reflected on the disk when the light spot crosses a track of the disk. A moving speed of the light spot is controlled by using the detected track-crossing signal to access the light spot in a radial direction of the disk in accelerating and decelerating modes. The access control method uses a precise driving device for slightly displacing the light spot in the radial direction of the disk, and a coarse driving device for greatly moving the light spot in the radial direction of the disk. The access control method has the steps of accelerating the light spot by the coarse driving device with approximately maximum ability in the accelerating mode; controlling the moving speed of the light spot by the precise driving device using the track-crossing signal in the decelerating mode; and decelerating the light spot by controlling an operation of the coarse driving device in cooperation with the precise driving device in the decelerating mode. An access controller has the coarse and precise driving devices.
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Hindi Nabil
Ricoh & Company, Ltd.
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