JPS6012823U - Focus servo device - Google Patents

Focus servo device

Info

Publication number
JPS6012823U
JPS6012823U JP10351883U JP10351883U JPS6012823U JP S6012823 U JPS6012823 U JP S6012823U JP 10351883 U JP10351883 U JP 10351883U JP 10351883 U JP10351883 U JP 10351883U JP S6012823 U JPS6012823 U JP S6012823U
Authority
JP
Japan
Prior art keywords
loop gain
focus servo
open loop
control means
focus
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.)
Pending
Application number
JP10351883U
Other languages
Japanese (ja)
Inventor
萩田　宏之
Original Assignee
株式会社ケンウッド
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 by 株式会社ケンウッド filed Critical 株式会社ケンウッド
Priority to JP10351883U priority Critical patent/JPS6012823U/en
Publication of JPS6012823U publication Critical patent/JPS6012823U/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

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

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来のフォーカスサーボ装置のブロック図。第
２図は本考案の一実施例の構成を示すブロック図。 １・・・ディスク、２・・・ディスク駆動モータ、３・
・・ピックアップ、４・・・マトリックス回路、５およ
び１２・・・・補償回路、７・・・出力増幅器、８・・
・ＲＦ信号レベル検出器、１５・・・制御回路。FIG. 1 is a block diagram of a conventional focus servo device. FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. 1... Disk, 2... Disk drive motor, 3...
...Pickup, 4...Matrix circuit, 5 and 12...Compensation circuit, 7...Output amplifier, 8...
- RF signal level detector, 15... control circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 回転駆動されている情報記録担体に記録された記録僧服
を光学的に読み取るピックアップの出力中から検出した
フォーカスエラー信号により情報記録担体の情報記録面
に対するフォーカスレンズ位置を所定開ループ利得で制
御するフォーカスサーボ装置において、一定期間内にフ
ォーカスサーボの引き込みができなかったことを検出し
かつ検出出力によって再びフォーカスサーボの引き込み
動作に切替える制御手段と、該制御手段の前記検出出力
によって開ループ利得を前記所定の開ループ利得よりも
低減させる開ループ利得低減手段とを備えてなることを
特徴とするフォーカスサーボ装置。The focus lens position relative to the information recording surface of the information record carrier is controlled with a predetermined open-loop gain using a focus error signal detected from the output of a pickup that optically reads the recording vest recorded on the information record carrier being rotated. In the focus servo device, the control means detects that the focus servo cannot be pulled in within a certain period and switches to the focus servo pull-in operation again based on the detection output, and the control means controls the open loop gain by the detection output of the control means. A focus servo device comprising: open loop gain reducing means for reducing the open loop gain below a predetermined open loop gain.
JP10351883U 1983-07-05 1983-07-05 Focus servo device Pending JPS6012823U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10351883U JPS6012823U (en) 1983-07-05 1983-07-05 Focus servo device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10351883U JPS6012823U (en) 1983-07-05 1983-07-05 Focus servo device

Publications (1)

Publication Number Publication Date
JPS6012823U true JPS6012823U (en) 1985-01-28

Family

ID=30243492

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10351883U Pending JPS6012823U (en) 1983-07-05 1983-07-05 Focus servo device

Country Status (1)

Country Link
JP (1) JPS6012823U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04123321A (en) * 1990-09-13 1992-04-23 Nec Corp Optical recording and reproducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5694528A (en) * 1979-12-28 1981-07-31 Matsushita Electric Ind Co Ltd Drawing-in method of focus servo

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04123321A (en) * 1990-09-13 1992-04-23 Nec Corp Optical recording and reproducing device

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