Fine access method of an optical disk drive by means of...

Details Fine access method of an optical disk drive by means of... Fine access method of an optical disk drive by means of...

G - Physics

11

B

352/32.2

G11B 7/08 (2006.01) G11B 7/085 (2006.01)

Patent

CA 1305254

ABSTRACT OF THE DISCLOSURE In a fine access for an optical disk drive, wherein a multi-track jump method is utilized, it is desired that the access method covers a wide range of more than a few hundred tracks with a high speed. According to the present invention, a one-shot accelerating or decelerating pulse of a short width is sent to an actuator head immediately after every half track pitch travel of the actuator head. Thus, the actuator head is accelerated when the travel time for a half track pitch is slower than the first reference time and it is decelerated when the travel time is faster than the second reference time. When the travel time is between the first and second reference times, no pulse is sent to the actuator head. Thus the velocity of the actuator head is compensated and maintained within a specified range of deviation for a whole long range of jumping many tracks.

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