Matsushita Electric Industrial Co., Ltd.

Isao Takemoto

Shuichi Yoshida

Kiyoshi Masaki

Teruyuki Naka

Tsutomu Kai

Noritaka Akagi

Yasuo Kashiwagi

A pickup moving mechanism for making it difficult to generate a deviation between an optical axis of an optical pickup and a target position on a disk. This mechanism is constituted to comprise: an elevation member tilting a guide member based on an angle deviation of the optical axis of the optical pickup in a disk diameter direction, and inclining the optical pickup supported by the guide member in a direction in which the angle deviation of the optical axis decreases; a cam follower; a tilt motor; an eccentric cam; an urging means; and a controller for controlling a pickup motor operating a screw member and an engagement member so as to move the optical pickup in a direction in which the deviation of the optical axis in the disk diameter direction generated by inclination of the optical pickup decreases.

Pickup moving mechanism for optical disk apparatus and pickup moving method therefor

In order to correct the change in the offset and amplitude of a tracking error signal because of the change in the position of an object lens from the center of an optical pickup, the offset amount and amplitude value of the tracking error signal with respect to the displacement amount of the object lens from the center of the optical pickup are checked beforehand, and the displacement amount of the object lens is estimated on the basis of a tracking correction signal by using an object lens displacement observer. An offset detection section and an amplitude detection section detect the offset amount and amplitude value of the tracking error signal respectively, and the tracking error signal is corrected by an offset correction circuit and an amplitude correction circuit on the basis of the offset amount and amplitude value having been checked beforehand so that the offset amount and the amplitude value of the tracking error signal become identical to those obtained when the displacement amount of the object lens is zero. In addition, the offset of the tilt error signal depending on the movement direction of the optical pickup is detected and recorded beforehand, and the tilt error signal is corrected on the basis of the above-mentioned recorded offset when a rotation direction detection section detects the moving direction of the optical pickup.

Optical information recording/reproducing device

Growing community of inventors

Saijo, Japan

Isao Takemoto