Takeharu Yamamoto

Optical disc drive, method of moving beam spot and computer-executable program implementable by the optical disc drive

Optical disk apparatus performing correction of phase difference tracking error signal, adjustment of focus position and process of gain adjustment

Optical disc reproduction apparatus

Control devices for optical disk based on driving signal saturation

Method of moving a beam spot between information storage layers of an optical disk

Judgement of optical disc type based on changes of rotating speed of a disc

Optical disc apparatus, crosstalk correction method and integrated circuit

Optical disc drive and optical disc controller

Optical recording/reproduction device

Optical disc device for varying PLL characteristic and servo characteristic based on actual reproduction speed