MDCP: Patent Abstact US04608676: Apparatus for optically reproducing an information signal from a record disk

US04608676 Apparatus for optically reproducing an information signal from a record disk

Assignee Sony Corporation

Assign./Filed Aug. 26, 1986/ March 26, 1985

Inventors Yoshida; Tadao, Haneda; Yoshiaki

Summary Relates to the positioning of an optical head for a CD player.

Abstract A method of moving a pick-up device of an optical reproducing apparatus to a position corresponding to a desired address of a record disk, the record disk having an information signal and an address signal recorded in an information area thereon, comprising the steps of producing a desired address signal corresponding to the desired address; partitioning the information area into radially partitioned information sections; moving the pick-up device to a position between two adjacent radially partitioned information sections at a speed faster than normal reproducing speed; reproducing the address signal at the last position of the pick-up device; comparing the reproduced address signal at the last position with the desired address signal; further moving the pick-up device in a direction and an amount determined by the comparing step to a position between two adjacent radially partitioned information sections and within one of the radially partitioned information sections between which the pick-up device was last positioned at a speed faster than the normal reproducing speed; and repeating the steps of reproducing, comparing and further moving until the pick-up device is moved to the position corresponding to the desired address. Apparatus for performing the above method is also provided.

US04608676	Apparatus for optically reproducing an information signal from a record disk
Assignee	Sony Corporation
Assign./Filed	Aug. 26, 1986/ March 26, 1985
Inventors	Yoshida; Tadao, Haneda; Yoshiaki
Summary	Relates to the positioning of an optical head for a CD player.
Abstract	A method of moving a pick-up device of an optical reproducing apparatus to a position corresponding to a desired address of a record disk, the record disk having an information signal and an address signal recorded in an information area thereon, comprising the steps of producing a desired address signal corresponding to the desired address; partitioning the information area into radially partitioned information sections; moving the pick-up device to a position between two adjacent radially partitioned information sections at a speed faster than normal reproducing speed; reproducing the address signal at the last position of the pick-up device; comparing the reproduced address signal at the last position with the desired address signal; further moving the pick-up device in a direction and an amount determined by the comparing step to a position between two adjacent radially partitioned information sections and within one of the radially partitioned information sections between which the pick-up device was last positioned at a speed faster than the normal reproducing speed; and repeating the steps of reproducing, comparing and further moving until the pick-up device is moved to the position corresponding to the desired address. Apparatus for performing the above method is also provided.