JPS59149229U - Focus servo circuit - Google Patents
Focus servo circuitInfo
- 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
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)
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.
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)
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 |
-
1983
- 1983-03-22 JP JP4174083U patent/JPS59149229U/en active Pending
Cited By (2)
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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