G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/085 (2006.01) G11B 7/095 (2006.01) G11B 21/08 (2006.01)
Patent
CA 1202720
ABSTRACT OF THE DISCLOSURE An apparatus for reproducing designated information from a digitally recorded disc uses a stepping motor which moves an optical pick-up device radially across the disc to the designated location using a predetermined number of stepping pulses representing the distance of the optical head to the designated location. A motor control circuit generates the stepping pulses in response to a driving signal comprising a predetermined number of driving pulses and a direction signal, the polarity of which corresponds to radially inward or outward movement of the pick-up device relative to the disc. A counter counts the driving pulses so that the actual count in the counter represents the distance of the optical head from a reference location, typically the beginning of the recorded track on the disc. A designating signal is used to generate a designated count of driving pulses required to reach the designated location from the same reference location. The difference between the actual count and the designated count is used to provide the driving signal for moving the pick-up device. When the pick-up device is within a certain distance of the designated location, address information read from the disc by the optical head is used to provide a fine-adjustment signal to precisely locate the optical head.
435187
Hiramatsu Akihiko
Tanizawa Seiji
Gowling Lafleur Henderson Llp
Sony Corporation
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