JPH0486223U - - Google Patents
Info
- Publication number
- JPH0486223U JPH0486223U JP13071190U JP13071190U JPH0486223U JP H0486223 U JPH0486223 U JP H0486223U JP 13071190 U JP13071190 U JP 13071190U JP 13071190 U JP13071190 U JP 13071190U JP H0486223 U JPH0486223 U JP H0486223U
- Authority
- JP
- Japan
- Prior art keywords
- section
- focus
- voltage
- error signal
- detection section
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
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号回路、２，７
１，７２，７３，７ｎ……抵抗器、３，８１，８
２，８３，８ｎ……スイツチ、４……増幅器、５
……フオーカス制御コイル、６……三角波発生器
、９……直流電源、１０１，１０２，１０３，１
０ｎ……ＯＲ回路、１１……バイアスコントロー
ラ、１２，１５……コンパレータ、１３……反転
回路、１４……Ｄフリツプフロツプ回路、１６…
…入力端子、１７……ワンシヨツトマルチ回路、
１８……出力端子である。
FIG. 1 is a block diagram showing an embodiment of the present invention.
FIG. 2 is a waveform diagram showing the operation. 1... Focus error signal detection circuit, 2, 7
1, 72, 73, 7n...Resistor, 3, 81, 8
2, 83, 8n...Switch, 4...Amplifier, 5
... Focus control coil, 6 ... Triangle wave generator, 9 ... DC power supply, 101, 102, 103, 1
0n...OR circuit, 11...Bias controller, 12, 15...Comparator, 13...Inverting circuit, 14...D flip-flop circuit, 16...
...Input terminal, 17...One-shot multi-circuit,
18... Output terminal.
Claims (1)
ラー信号検出部の出力を基準電圧と比較する比較
部と、比較部の出力により対物レンズのフオーカ
ス点を検出する検出部と、対物レンズがフオーカ
ス点に達する前にはフオーカスエラー信号又は基
準電圧に直流電圧を印加する電圧印加部と、直流
電圧の値を可変する電圧制御部とを備え、検出部
の出力によりフオーカスサーボループを閉じるよ
うにスイツチングする構成としたことを特徴とす
る、光ピツクアツプのフオーカス制御装置。 A focus error signal detection section, a comparison section that compares the output of the focus error signal detection section with a reference voltage, a detection section that detects the focus point of the objective lens based on the output of the comparison section, and the objective lens reaches the focus point. The front is equipped with a voltage application section that applies a DC voltage to the focus error signal or reference voltage, and a voltage control section that varies the value of the DC voltage, and is switched to close the focus servo loop based on the output of the detection section. A focus control device for an optical pickup, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990130711U JPH0722743Y2 (en) | 1990-11-30 | 1990-11-30 | Focus control device for optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1990130711U JPH0722743Y2 (en) | 1990-11-30 | 1990-11-30 | Focus control device for optical pickup |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0486223U true JPH0486223U (en) | 1992-07-27 |
| JPH0722743Y2 JPH0722743Y2 (en) | 1995-05-24 |
Family
ID=31878028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1990130711U Expired - Lifetime JPH0722743Y2 (en) | 1990-11-30 | 1990-11-30 | Focus control device for optical pickup |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722743Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62202620U (en) * | 1986-06-12 | 1987-12-24 | ||
| JPS63105921U (en) * | 1986-12-27 | 1988-07-08 |
-
1990
- 1990-11-30 JP JP1990130711U patent/JPH0722743Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62202620U (en) * | 1986-06-12 | 1987-12-24 | ||
| JPS63105921U (en) * | 1986-12-27 | 1988-07-08 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0722743Y2 (en) | 1995-05-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| S531 | Written request for registration of change of domicile |
Free format text: JAPANESE INTERMEDIATE CODE: R323531 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| EXPY | Cancellation because of completion of term |