Matsushita Electric Industrial Co., Ltd.

Victor Company of Japan, Limited

Mitsuhiko Oohta

Kenji Koishi

Takashi Kawai

Chikashi Inokuchi

Yutaka Osada

Kohjyu Konno

An optical disc apparatus reads the address information from an optical disc which has tracks and track spaces formed between tracks. The apparatus has an optical head which irradiates the disc with light and includes tracking detectors, divided into a first detector and a second detector in a track direction, detecting the light reflected from the disc and outputting detection signals, an adjusting circuit which adjusts amplitudes of the first and second detection signals and outputs the signals at a position where the address information is recorded, a differential amplifying circuit which outputs the differential signal which is the difference between the adjusted first and second detection signals, and an address detecting circuit which detects the address information based on the differential signal. As a result, the optical disc apparatus accurately detects whether information is being recorded on a correct track and improves the reliability during recording.

Optical disc apparatus and method for reading information from an optical disk having tracks and spaces between the tracks on which address information is recorded

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Yokohama, Japan

Mitsuhiko Oohta