Patent Number: 6,167,006

Title: Optical information recording/reproducing apparatus based on tracking control of irradiated light

Abstract: An optical information recording/reproducing apparatus for optically recording/reproducing information by irradiating a track on a recording medium with a light comprises: a detecting circuit, a tracking error signal producing circuit, and a tracking control circuit. The detecting circuit selectively detects a circular area having a diameter smaller than a diameter of a light beam reflected from the recording medium and obtains an output signal corresponding to the detected circular area. The tracking error signal producing circuit produces, from the output signal of the detecting circuit, a tracking error signal indicating a shift in a position of a light beam irradiated on the recording medium in a track width direction. The tracking control circuit controls an irradiation position of a light beam irradiated on the recording medium in the track width direction based on the tracking error signal.

Inventors: Tanaka; Masahiko (Yokohama, JP), Watabe; Kazuo (Funabashi, JP)

Assignee: Kabushiki Kaisha Toshiba

International Classification: G11B 7/09 (20060101); G11B 7/135 (20060101); G11B 11/00 (20060101); G11B 11/105 (20060101); G11B 007/09 ()

Expiration Date: 12/26/2017