Fine access method of an optical disk drive by means of multi-track jumpand a circuit therefor

Abstract From the Canadian patent

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 …