Sony Computer Entertainment Inc.

Sony Corporation

Toshisada Takada

Kiyoshi Omori

Toshikazu Kobayashi

Masayasu Ito

Satoshi Muto

Aki Yoguchi

Masaki Nagatsuka

Satoshi Mimura

Hiroshi Ohtsu

Akio Ishiwata

Koichiro Takahashi

Kouji Shinohara

There is provided a disk drive including a base chassis, a first optical pickup mechanism including a disk rotation drive disposed on the base chassis, first optical pickup unit to write and/or read data to and/or from a first optical disk and a first pickup moving mechanism to move the first optical pickup unit radially of the first optical disk, a second optical pickup mechanism disposed opposite to the first optical pickup mechanism and including a second optical pickup unit to write and/or read data to and/or from a second optical disk and a second pickup moving mechanism to move the second optical pickup unit radially of the second optical disk, and a controlling means for detecting the movement of one of the optical pickup units and moving the other optical pickup unit to make weight balancing of the base chassis. Thus, the base chassis weight is balanced while one of the two optical pickup units is being moved.

Disk drive

In an optical disc apparatus, a minimum jitter value is established from each jitter value measured in correspondence to a successively changed servo constant, and multiplied by a prescribed ratio so as to set a jitter threshold value. Servo constants corresponding to at least two jitter values substantially equal to the jitter threshold value is established, and an optimum servo constant is set based on this minimum of two servo constants. By doing this, it is possible to quickly and accurately detect the optimum servo constant, and achieve good servo adjustment.

Optical disc apparatus and method for adjusting a servo of same

Growing community of inventors

Chiba, Japan

Toshisada Takada