JPH01159214U - - Google Patents
Info
- Publication number
- JPH01159214U JPH01159214U JP5413088U JP5413088U JPH01159214U JP H01159214 U JPH01159214 U JP H01159214U JP 5413088 U JP5413088 U JP 5413088U JP 5413088 U JP5413088 U JP 5413088U JP H01159214 U JPH01159214 U JP H01159214U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- focus
- focus search
- error output
- bias
- 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
Links
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
第１図Ａ及びＢはこの考案に係るフオーカスサ
ーチ回路の実施例を示し、第１図Ａは回路図、第
１図Ｂは波形図である。第２図及び第３図Ａ，Ｂ
は従来例を示し、第２図は波形図、第３図Ａは他
の従来例の回路図、第３図ＢはＡの波形図である
。
主な番号の説明、２：フオーカスサーボアンプ
、３：フオーカスコイル、４，５，８：Ｓカーブ
、６：フオーカスエラー出力端子、７：ＦＺＣ入
力端子、Ｓ１，Ｓ２：半導体スイツチ。
1A and 1B show an embodiment of a focus search circuit according to this invention, with FIG. 1A being a circuit diagram and FIG. 1B being a waveform diagram. Figure 2 and Figure 3 A, B
2 shows a conventional example, FIG. 2 is a waveform diagram, FIG. 3A is a circuit diagram of another conventional example, and FIG. 3B is a waveform diagram of A. Explanation of the main numbers: 2: Focus servo amplifier, 3: Focus coil, 4, 5, 8: S curve, 6: Focus error output terminal, 7: FZC input terminal, S1, S2: Semiconductor switch.
Claims (1)
エラー出力であるＳカーブの零レベルを検出して
、フオーカスサーボ系を動作させるフオーカスサ
ーチ回路において、 フオーカスサーチ中、フオーカスエラー出力に
正の直流バイアス電圧を加えるバイアス回路と、
フオーカスサーチ終了後にこのバイアス回路とフ
イルタ回路とを切換える切換手段とを備えたこと
を特徴とするフオーカスサーチ回路。[Claim for Utility Model Registration] In a focus search circuit that detects the zero level of an S curve, which is a focus error output in an optical disc player, and operates a focus servo system, a bias circuit that applies a positive DC bias voltage to the error output;
A focus search circuit comprising switching means for switching between the bias circuit and the filter circuit after completion of the focus search.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5413088U JPH0624010Y2 (en) | 1988-04-23 | 1988-04-23 | Focus search circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5413088U JPH0624010Y2 (en) | 1988-04-23 | 1988-04-23 | Focus search circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01159214U true JPH01159214U (en) | 1989-11-02 |
| JPH0624010Y2 JPH0624010Y2 (en) | 1994-06-22 |
Family
ID=31280072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5413088U Expired - Lifetime JPH0624010Y2 (en) | 1988-04-23 | 1988-04-23 | Focus search circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0624010Y2 (en) |
-
1988
- 1988-04-23 JP JP5413088U patent/JPH0624010Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0624010Y2 (en) | 1994-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH01159214U (en) | ||
| JPS59149229U (en) | Focus servo circuit | |
| JPS62203536U (en) | ||
| JPS6387619U (en) | ||
| JPS62202620U (en) | ||
| JPS63114410U (en) | ||
| JPS61203426U (en) | ||
| JPS6442514U (en) | ||
| JPS63152317U (en) | ||
| JPS6266480U (en) | ||
| JPH0190169U (en) | ||
| JPS62171020U (en) | ||
| JPH0394625U (en) | ||
| JPS6226619U (en) | ||
| JPS6183114U (en) | ||
| JPH0398756U (en) | ||
| JPS5847171U (en) | Response speed switching circuit for conversion amplifier circuit | |
| JPH046857U (en) | ||
| JPS603908U (en) | recording device | |
| JPS5897799U (en) | Sampling hold circuit | |
| JPS62110703U (en) | ||
| JPH0398762U (en) | ||
| JPH0320030U (en) | ||
| JPS6428569U (en) | ||
| JPS62147129U (en) |