JPH0276321U - - Google Patents

Info

Publication number
JPH0276321U
JPH0276321U JP15466788U JP15466788U JPH0276321U JP H0276321 U JPH0276321 U JP H0276321U JP 15466788 U JP15466788 U JP 15466788U JP 15466788 U JP15466788 U JP 15466788U JP H0276321 U JPH0276321 U JP H0276321U
Authority
JP
Japan
Prior art keywords
reference voltage
focus
error signal
focus error
objective lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15466788U
Other languages
English (en)
Other versions
JPH0621048Y2 (ja
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP15466788U priority Critical patent/JPH0621048Y2/ja
Publication of JPH0276321U publication Critical patent/JPH0276321U/ja
Application granted granted Critical
Publication of JPH0621048Y2 publication Critical patent/JPH0621048Y2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

【図面の簡単な説明】
第１図は本考案の一実施例を示すブロツク図、
第２図はその動作を示す波形図である。 １……フオーカスエラー信号検出回路、３，９
……スイツチ、６，１１……コンパレータ、１２
……Ｄフリツプフロツプ。

Claims (1)

    【実用新案登録請求の範囲】
  1. フオーカスエラー信号を基準電圧と比較するこ
    とにより、対物レンズのジヤストフオーカス点を
    検出し、上記対物レンズのフオーカスサーボルー
    プを閉じる様にした光デイスク装置において、上
    記対物レンズがジヤストフオーカス点に達する前
    にはフオーカスエラー信号が基準電圧と一致せぬ
    様に上記フオーカスエラー信号又は上記基準電圧
    に直流電圧を加算することを特徴とする光ピツク
    アツプのフオーカス制御装置。
JP15466788U 1988-11-28 1988-11-28 光ピックアップのフォーカス制御装置 Expired - Fee Related JPH0621048Y2 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15466788U JPH0621048Y2 (ja) 1988-11-28 1988-11-28 光ピックアップのフォーカス制御装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15466788U JPH0621048Y2 (ja) 1988-11-28 1988-11-28 光ピックアップのフォーカス制御装置

Publications (2)

Publication Number Publication Date
JPH0276321U true JPH0276321U (ja) 1990-06-12
JPH0621048Y2 JPH0621048Y2 (ja) 1994-06-01

Family

ID=31431602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15466788U Expired - Fee Related JPH0621048Y2 (ja) 1988-11-28 1988-11-28 光ピックアップのフォーカス制御装置

Country Status (1)

Country Link
JP (1) JPH0621048Y2 (ja)

Also Published As

Publication number Publication date
JPH0621048Y2 (ja) 1994-06-01

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees