JPS613520U

JPS613520U - optical pickup device

Info

Publication number: JPS613520U
Application number: JP8556584U
Authority: JP
Inventors: 正人池田
Original assignee: アイワ株式会社
Priority date: 1984-06-11
Filing date: 1984-06-11
Publication date: 1986-01-10
Also published as: JPH0325293Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案実施例の要部回路構成図、第２図はトラ
ッキングサーボ動作の説明図、第３図は従来例アクチュ
エータの構造図、第４図は本考案実施例のアクチュエー
タ構造図、第５図、第６図はサーボ動作を説明する図、
第７図は実施例検波−回路の特性図、第８図は実施例ウ
インドコンパレータの特性図である。符号の説明、３・・・筐体、６・・・対物Ｊンズ、７・
・・モータ、１３・・・アグチュエータ、２９・・・検
出回路、２Ｂ・・・スイッチ。FIG. 1 is a circuit diagram of the main part of the embodiment of the present invention, FIG. 2 is an explanatory diagram of tracking servo operation, FIG. 3 is a structural diagram of a conventional actuator, and FIG. 4 is a structural diagram of an actuator according to an embodiment of the present invention. Figures 5 and 6 are diagrams explaining servo operation;
FIG. 7 is a characteristic diagram of the embodiment detection circuit, and FIG. 8 is a characteristic diagram of the embodiment window comparator. Explanation of symbols, 3... Housing, 6... Objective J's, 7.
...Motor, 13...Actuator, 29...Detection circuit, 2B...Switch.

Claims

[Claims for Utility Model Registration] A travelator that is rotatable or swingable within a housing and that is electromagnetically driven by a servo signal to finely control the position of a light spot of an optical pickup; A detection circuit detects displacement from a reference position within the housing, and the output of the detection circuit is used as a position control signal for the housing.
In an optical pickup device, the output of the detection circuit is substantially input to the actuator and a transfer means for driving the housing in a direction to position the actuator relative to the reference position. In order to generate a return signal that returns the actuator toward the reference position, a feedback loop is formed in the output stage of the detection circuit via a switching means, and the switching means switches between the return signal and the above. An optical pickup device characterized by selectively applying a position control signal.