JPH01124925U

JPH01124925U -

Info

Publication number: JPH01124925U
Application number: JP1771188U
Authority: JP
Priority date: 1988-02-12
Filing date: 1988-02-12
Publication date: 1989-08-25

Description

[Brief explanation of drawings]

第１図は本考案の一実施例を示す回路ブロツク
図、第２図はそのフオーカシング制御系の具体例
を示す回路図である。主な図番の説明、１……光ピツクアツプ、２，
３７……フオーカシングコイル、３……トラツキ
ングコイル、５……ＨＦ信号作成回路、６……フ
オーカシング誤差信号作成回路、７……トラツキ
ング誤差信号作成回路、９……フオーカシングコ
イル駆動回路、１１……トラツキングコイル駆動
回路、１２，１５……信号欠落検出回路、１３，
２６……第１直流電圧印加回路、１４……第２直
流電圧印加回路。 FIG. 1 is a circuit block diagram showing one embodiment of the present invention, and FIG. 2 is a circuit diagram showing a specific example of the focusing control system. Explanation of main figure numbers, 1...Light pick-up, 2,
37... Focusing coil, 3... Tracking coil, 5... HF signal generation circuit, 6... Focusing error signal generation circuit, 7... Tracking error signal generation circuit, 9... Focusing coil drive circuit , 11... Tracking coil drive circuit, 12, 15... Signal loss detection circuit, 13,
26...First DC voltage application circuit, 14...Second DC voltage application circuit.

Claims

[Claims for Utility Model Registration] (1) An optical disk player that optically reproduces signals recorded on a disk using an optical pickup that focuses a light beam on the signal surface of the disk by driving an objective lens. , a focusing coil to which a drive current for driving the objective lens in the focusing direction is supplied, and a drop in the HF signal obtained from the optical pickup is detected, and a drop detection signal is generated in accordance with the period of the drop. An optical disc player comprising: a signal loss detection circuit; and a DC voltage application circuit that applies a DC voltage to the focusing coil when a loss detection signal is generated from the signal loss detection circuit. (2) In an optical disk player that optically reproduces signals recorded on a disk using an optical pickup that causes a light beam to follow a signal track on the disk by driving an objective lens,
a tracking coil supplied with a drive current for driving the objective lens in a tracking direction;
A signal dropout detection circuit detects a dropout in the HF signal obtained from the optical pickup and generates a dropout detection signal according to the length of the dropout period, and a DC current is applied to the tracking coil when the dropout detection signal is generated from the signal dropout detection circuit. An optical disc player equipped with a DC voltage application circuit that applies voltage.