Speed control of optical information reproduction apparatus

Details Speed control of optical information reproduction apparatus Speed control of optical information reproduction apparatus

1995-10-27

1998-09-15

Psitos, Aristotelis M.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 54, 369239, G11B 700

Patent

active

058089780

ABSTRACT:
A method for controlling speed of a spindle motor within a disk player is provided. The spindle motor drives a disk thereon and the disk player includes a pickup and a control circuit for performing focus and tracking operation of the pickup. The first step of method is to determine an allowable spin speed, Va, in accordance with a predetermined manner. The second step is to set speed of the spindle motor to operate at an allowable speed Va. The third step it to test if out-of-focus occurs during seeking of a particular track. If Yes in step 3, the fourth step is to re-focus the pickup. The fifth step is to set Va=Va- a predetermined decrement. The sixth step is to set speed of the spindle motor to operate at current Va decreased speed.

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Compact Disc Digital Audio System Description--Sony Corp., N.V. Philips, Feb. 1985.

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