JPS613521U

JPS613521U - optical pickup device

Info

Publication number: JPS613521U
Application number: JP8556684U
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: JPH0319062Y2

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]

構成図、第２図はトラッキングサーボ動作の説明図ミ第
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図は第１の実施例に於けるウインドコンパレー
タの特性図、第９図は本考案の第２の実施例を示す要部
回路構成図、第１０図、第１１図は第２の実施例に供す
ウインドコンパレータの特性図である。符号の説明ζ３・・・筐体、−７・・・モータ、１３・
・・ア，クチュエータ、２９・・・検出回路、３５
・・・制御回路。Fig. 2 is an explanatory diagram of tracking servo operation, Fig. 3 is a structural diagram of a conventional actuator, Fig. 4 is a structural diagram of an actuator according to an embodiment of the present invention, and Figs. 5 and 6 are illustrations of servo operation. 7 is a characteristic diagram of the embodiment detection circuit, FIG. 8 is a characteristic diagram of the window comparator in the first embodiment, and FIG. 9 is a main part showing the second embodiment of the present invention. The circuit configuration diagrams, FIGS. 10 and 11 are characteristic diagrams of the window comparator used in the second embodiment. Explanation of symbols ζ3...Housing, -7...Motor, 13.
...A, actuator, 29...detection circuit, 35
...Control circuit.

Claims

[Claims for Utility Model Registration] (1) A tracking actuator that is rotatable or swingable within the housing and is electromagnetically driven by a servo signal to finely control the optical spot position of the optical pickup; A rise circuit detects the displacement of the actuator from a reference position within the housing, and the output of the detection circuit is inputted as a position control signal for the housing, and the output of the detection circuit is inputted as a position control signal for the housing to move the actuator relative to the standard position. In an optical pickup device having a transfer means for vertically moving the housing in a positioning direction, a feedback system is controlled to apply the output of the detection circuit to the actuator side. An optical pickup device characterized in that the optical pickup device is operated by a control circuit that monitors the output level and establishes a control state to be compared in response to the difference in height of the output level. (2) The optical pickup device according to claim 1, wherein the control circuit performs feedback of the output of the detection circuit when the output of the detection circuit is equal to or higher than a predetermined level. (3) The control circuit is equipped with a holding constant means for holding the output feedback of the detection circuit for a certain period of time. A first level-7 detection circuit that detects that the output is above the level of vehicle 1; and a second level that detects that the output of the detection circuit is at the same level as or lower than the first level. and a second level detection circuit for detecting that the level is below, and the output feedback of the detection circuit is controlled by the first and second level detection circuits. The optical pickup device according to item 1 or 2. (5) The detection circuit c1 detects the position by synchronously detecting the differential output based on the tracking operation of the actuator at a predetermined number of cycles. Optical pick-up device.