Disc recording and reproducing device

Abstract

Abstract PURPOSE:To reduce the longest retrieval time by controlling the movement of a pickup corresponding to the result of comparison of number of sectors per revolution of a track and of the difference between an object address and a present address of the pickup when an object address is designated. CONSTITUTION:When the present address is not coincident with the object address, the number S of sectors per one revolution of track near the object address is operated. Then a control circuit 6 operates a difference between the present address and the object address. When the pickup 4 is placed at the inner circumference than the object address and the difference is below the sector number S, the pickup 4 is not moved but awaits the disc 1 turned once until the object address is detected and read. When the difference between the present address and the object address is larger than the sector number S, the control circuit 6 compares the difference and a value being twice the sector number S, and when the address difference is below the twice of the sector number S, a control signal is given to a drive circuit 7 to move the pickup 4 by one track toward the peripheral direction.

Inventors

• 👤 Yoshitaka Mitsunari
• 👤 光成　祥孝

Bibliographic Details