Information recording disk, and information recording/reproducin

Details Information recording disk, and information recording/reproducin Information recording disk, and information recording/reproducin

1990-03-30

1993-04-27

LaRoche, Eugene R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4425, 369 4426, 369 4411, G11B 700

Patent

active

052068471

ABSTRACT:
There is disclosed an information recording disk, and a method and apparatus for information recording and reproduction, enabling secure tracking and full utilization of the recording capacity. For this purpose, a spiral or concentric track divided into plural sectors is provided with servo signals for detecting tracking error, by an integral number per sector, and the number is made different between the tracks in the radially inner area of the disk and those in the outer area. The disk is rotated at a constant angular velocity, and the tracking error is detected by the servo signals with a first clock signal of a constant frequency, while the information recording and/or reproduction is conducted with a second clock signal having a frequency higher for the tracks in the outer area of the disk.

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patent: 4791622 (1988-12-01), Clay et al.
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patent: 4819218 (1989-04-01), Barnard
patent: 4860271 (1989-08-01), Yokogawa et al.
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patent: 4873679 (1989-10-01), Morai et al.
patent: 4907215 (1990-03-01), Sako et al.
patent: 4918677 (1990-04-01), Ashinuma et al.

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