JPS59149229U - Focus servo circuit - Google Patents

Focus servo circuit

Info

Publication number
JPS59149229U
JPS59149229U JP4174083U JP4174083U JPS59149229U JP S59149229 U JPS59149229 U JP S59149229U JP 4174083 U JP4174083 U JP 4174083U JP 4174083 U JP4174083 U JP 4174083U JP S59149229 U JPS59149229 U JP S59149229U
Authority
JP
Japan
Prior art keywords
focus servo
circuit
servo circuit
search circuit
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.)
Pending
Application number
JP4174083U
Other languages
Japanese (ja)
Inventor
蔵屋　記昭
雄二 池田
Original Assignee
フオスタ−電機株式会社
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 フオスタ−電機株式会社 filed Critical フオスタ−電機株式会社
Priority to JP4174083U priority Critical patent/JPS59149229U/en
Publication of JPS59149229U publication Critical patent/JPS59149229U/en
Pending legal-status Critical Current

Links

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Control Of Position Or Direction (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) [Abstract] 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]

図は本考案の一実施例を示す回路図である。 １・・・光ピツクアップ、２・・・フォーカスエラー検
出回路、３・・・演算増幅器、４・・・フォーカスコイ
ル、５・・・信号再生回路、６・・・制御回路、７・・
・低周波発゛振器、８・・・高周波発振−，９・・・サ
ーチ回路。The figure is a circuit diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Optical pickup, 2... Focus error detection circuit, 3... Operational amplifier, 4... Focus coil, 5... Signal regeneration circuit, 6... Control circuit, 7...
-Low frequency oscillator, 8...High frequency oscillation, 9...Search circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] サーチ回路の低周波出力をサーボ増幅器に入力して対物
レンズを光軸方向に移動させ、合焦点位置に到達した時
点で、該サーチ回路の出力を所定値に保つと共にフォー
カスサーボループを動作させて、前記対物レンズを合焦
点位置に保持するように構成したフォーカスサーボ゛回
路において、前記フォーカスサーボループの動作開始前
の前記サーチ回路の低周波出力に高周波小振幅信号を重
畳させたことを特徴とするフォーカスサーボ回路。The low frequency output of the search circuit is input to a servo amplifier to move the objective lens in the optical axis direction, and when the focused position is reached, the output of the search circuit is maintained at a predetermined value and the focus servo loop is operated. , in the focus servo circuit configured to hold the objective lens at a focused position, a high frequency, small amplitude signal is superimposed on the low frequency output of the search circuit before the start of operation of the focus servo loop. Focus servo circuit.
JP4174083U 1983-03-22 1983-03-22 Focus servo circuit Pending JPS59149229U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4174083U JPS59149229U (en) 1983-03-22 1983-03-22 Focus servo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4174083U JPS59149229U (en) 1983-03-22 1983-03-22 Focus servo circuit

Publications (1)

Publication Number Publication Date
JPS59149229U true JPS59149229U (en) 1984-10-05

Family

ID=30172307

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4174083U Pending JPS59149229U (en) 1983-03-22 1983-03-22 Focus servo circuit

Country Status (1)

Country Link
JP (1) JPS59149229U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60263335A (en) * 1984-06-12 1985-12-26 Fujitsu Ten Ltd Focusing device
JP2007018687A (en) * 2005-06-09 2007-01-25 Sony Corp Lens positioning method, cutting method, positioning method, and cutting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60263335A (en) * 1984-06-12 1985-12-26 Fujitsu Ten Ltd Focusing device
JP2007018687A (en) * 2005-06-09 2007-01-25 Sony Corp Lens positioning method, cutting method, positioning method, and cutting device

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