JPH0212718U - - Google Patents
Info
- Publication number
- JPH0212718U JPH0212718U JP9115888U JP9115888U JPH0212718U JP H0212718 U JPH0212718 U JP H0212718U JP 9115888 U JP9115888 U JP 9115888U JP 9115888 U JP9115888 U JP 9115888U JP H0212718 U JPH0212718 U JP H0212718U
- Authority
- JP
- Japan
- Prior art keywords
- area
- servo pull
- focus servo
- focus
- high speed
- 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
- 238000001514 detection method Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 8
- 238000007493 shaping process Methods 0.000 description 1
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は対物レンズ移動量に対するフオーカス
サーボ引き込み領域を示す線図、第２図，は
従来公知のフオーカスエラー検出装置を示す概略
図、第３図は本考案に係わるフオーカスサーボ引
き込み領域検出手段のブロツク図、第４図，
，，は第３図の検出手段の各部位の信号波形
を示す線図、第５図は本考案に係わるフオーカス
サーチ手段を示すブロツク図、第６図，，
は第５図の各部の信号波形および対物レンズの移
動速度を示す線図、第７図は本考案と従来例との
作用を比較する線図である。
１１……フオーカスサーボ引き込み領域検出手
段、１２……フオーカスサーチ手段、１３……フ
オーカスエラー信号発生器、１４……基準電圧発
生器、１５……比較器、１６……微分回路、１７
……波形整形回路、１８……フオーカスサーボ引
き込み領域検出信号、１９……ラツチ回路、２０
……フオーカスサーチ信号発生器、２２……ドラ
イバー、２３……対物レンズ移動用アクチユエー
タ、２４……ゲイン切換スイツチ。
Fig. 1 is a diagram showing the focus servo pull-in area with respect to the amount of movement of the objective lens, Fig. 2 is a schematic diagram showing a conventionally known focus error detection device, and Fig. 3 is a diagram showing the focus servo pull-in area according to the present invention. Block diagram of the detection means, Fig. 4,
,, are diagrams showing the signal waveforms of each part of the detection means in FIG. 3, FIG. 5 is a block diagram showing the focus search means according to the present invention, and FIG.
5 is a diagram showing the signal waveform of each part and the moving speed of the objective lens, and FIG. 7 is a diagram comparing the effects of the present invention and the conventional example. DESCRIPTION OF SYMBOLS 11...Focus servo pull-in area detection means, 12...Focus search means, 13...Focus error signal generator, 14...Reference voltage generator, 15...Comparator, 16...Differentiating circuit, 17
... Waveform shaping circuit, 18 ... Focus servo pull-in area detection signal, 19 ... Latch circuit, 20
... Focus search signal generator, 22 ... Driver, 23 ... Objective lens movement actuator, 24 ... Gain selection switch.
Claims (1)
手段と、該検出手段からのフオーカスサーボ引き
込み領域に達した検出信号に基づいて対物レンズ
の移動速度を高速から低速に変化させる手段を設
け、対物レンズをフオーカスサーボ引き込み領域
に達するまでは高速で移動すると共にフオーカス
サーボ引き込み領域に入ると低速で移動してフオ
ーカスサーチをミスなく高速で行い得る構成とし
たことを特徴とするデイスクプレーヤのフオーカ
スサーチシステム。 A detection means for detecting the focus servo pull-in area and a means for changing the moving speed of the objective lens from high speed to low speed based on a detection signal from the detection means that reaches the focus servo pull-in area are provided. A focus search for a disk player, characterized in that it moves at high speed until it reaches the focus servo pull-in area, and moves at low speed once it enters the focus servo pull-in area, allowing focus search to be performed at high speed without mistakes. system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9115888U JPH0212718U (en) | 1988-07-08 | 1988-07-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9115888U JPH0212718U (en) | 1988-07-08 | 1988-07-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0212718U true JPH0212718U (en) | 1990-01-26 |
Family
ID=31315652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9115888U Pending JPH0212718U (en) | 1988-07-08 | 1988-07-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0212718U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006294124A (en) * | 2005-04-11 | 2006-10-26 | Mitsutoyo Corp | Focus servo device, surface shape measuring instrument, compound measuring instrument, focus servo control method, focus servo control program, and recording medium with the program recorded thereon |
-
1988
- 1988-07-08 JP JP9115888U patent/JPH0212718U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006294124A (en) * | 2005-04-11 | 2006-10-26 | Mitsutoyo Corp | Focus servo device, surface shape measuring instrument, compound measuring instrument, focus servo control method, focus servo control program, and recording medium with the program recorded thereon |
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