JPS60170802U

JPS60170802U - Optical pickup servo circuit

Info

Publication number: JPS60170802U
Application number: JP5786384U
Authority: JP
Inventors: 荘授後藤
Original assignee: 株式会社ケンウッド
Priority date: 1984-04-19
Filing date: 1984-04-19
Publication date: 1985-11-12
Also published as: JPH0534006Y2

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来例のサーボ回路図、第２図は本考案の第１
実施例を示すサーボ回路図、第３図は第２図の回路の作
用を示す信号のタイムチャート、第４図は本考案の第２
実施例を示すサーボ回路のブロック図、第５図は第３図
のマイクロコンピュ　　　　□−タへ格納されるプログ
ラムに対応したフローチャートである。２６・・・サーボ回路、３４・・・電圧レベル判別回路
、３６・・・サーボアンプ、３８・・・ハイモード回路
、５０・・・アナログスイッチ、６８・・・電圧変化率
符号判別回路、７６・・・ハイモード出力回路、１１２
・・・引算器、１１８・・・サーボ回路。Figure 1 is the conventional servo circuit diagram, Figure 2 is the first servo circuit diagram of the present invention.
A servo circuit diagram showing an embodiment, FIG. 3 is a signal time chart showing the operation of the circuit of FIG. 2, and FIG. 4 is a servo circuit diagram of the second embodiment of the present invention.
FIG. 5 is a block diagram of a servo circuit showing an embodiment, and is a flowchart corresponding to a program stored in the microcomputer shown in FIG. 3. 26... Servo circuit, 34... Voltage level discrimination circuit, 36... Servo amplifier, 38... High mode circuit, 50... Analog switch, 68... Voltage change rate sign discrimination circuit, 76 ...High mode output circuit, 112
...Subtractor, 118...Servo circuit.

Claims

[Scope of utility model registration request]

In a servo circuit equipped with an error detector that detects that the control state of the controlled object deviates from the set value and outputs an error voltage of positive or negative potential in proportion to this deviation,
error voltage level determining means for detecting that the absolute value of the error voltage exceeds a predetermined value; polarity determining means for detecting the polarity of the error voltage; and differential polarity determining means for detecting the polarity of the differential value of the error voltage. and forced output signal generation means for generating a forced output signal to reduce the absolute value of the error voltage based on the outputs of the polarity determining means and the differential polarity determining means, when the absolute value of the error voltage is less than a predetermined value. A servo circuit that performs normal servo operation and performs control using a forced output signal when the absolute value of an error voltage exceeds a predetermined value.