JPH0242214U - - Google Patents
Info
- Publication number
- JPH0242214U JPH0242214U JP11990388U JP11990388U JPH0242214U JP H0242214 U JPH0242214 U JP H0242214U JP 11990388 U JP11990388 U JP 11990388U JP 11990388 U JP11990388 U JP 11990388U JP H0242214 U JPH0242214 U JP H0242214U
- Authority
- JP
- Japan
- Prior art keywords
- information reading
- recording medium
- reading means
- speed
- information
- 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 3
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- 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図は第１図のタイミングチヤート、第３図は
本考案の一実施例を示す具体的回路図、第４図、
第５図は第３図のタイミングチヤートである。
１ａ，１ｂ……受光素子、９……ゼロクロス検
出回路、１１……デイスク検出回路、１２……ル
ープＳＷ制御回路、１３……レンズＳＷＥＥＰ制
御回路、１５……レンズＳＷＥＥＰ電圧発生回路
。
FIG. 1 is a block diagram showing an embodiment of the present invention.
Fig. 2 is a timing chart of Fig. 1, Fig. 3 is a specific circuit diagram showing an embodiment of the present invention, Fig. 4,
FIG. 5 is a timing chart of FIG. 3. 1a, 1b... Light receiving element, 9... Zero cross detection circuit, 11... Disk detection circuit, 12... Loop SW control circuit, 13... Lens SWEEP control circuit, 15... Lens SWEEP voltage generation circuit.
Claims (1)
体と情報読み出し手段との距離に応じて誤差信号
を発生する誤差検出手段と、該誤差信号を導通、
非導通とするためのスイツチと、前記情報読み出
し手段を情報記録媒体と垂直方向に移動させるた
めの信号発生手段と、該信号発生手段と前記スイ
ツチの出力を加算するための加算器と、該加算器
の出力信号に応じて前記情報読み出し手段のデイ
スクに対する相対位置を制御するフオーカス制御
手段とを有し、サーボ引込み制御時には前記信号
発生手段の出力で情報読み出し手段を第１の速度
で記録媒体から遠ざける方向あるいは近づける方
向に移動させ、再生中にフオーカス制御が不能と
なつたときには前記第１の速度よりも速い第２の
速度で情報読み出し手段を記録媒体から遠ざける
様に制御したあと、再度前記第１の速度で引込む
制御をさせる様にしたことを特徴とするフオーカ
スサーボ引込み回路。 an information recording medium, an information reading means, an error detection means for generating an error signal according to the distance between the recording medium and the information reading means, and conducting the error signal;
a switch for making the switch non-conductive; a signal generating means for moving the information reading means in a direction perpendicular to the information recording medium; an adder for adding the outputs of the signal generating means and the switch; and focus control means for controlling the relative position of the information reading means with respect to the disk according to an output signal from the device, and during servo pull-in control, the information reading means is moved from the recording medium at a first speed by the output of the signal generating means. If the focus control becomes impossible during playback, the information reading means is controlled to move away from the recording medium at a second speed faster than the first speed, and then the information reading means is moved away from the recording medium again. A focus servo retraction circuit characterized in that the retraction control is performed at a speed of 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11990388U JPH0242214U (en) | 1988-09-14 | 1988-09-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11990388U JPH0242214U (en) | 1988-09-14 | 1988-09-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0242214U true JPH0242214U (en) | 1990-03-23 |
Family
ID=31365541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11990388U Pending JPH0242214U (en) | 1988-09-14 | 1988-09-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0242214U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005055213A1 (en) * | 2003-12-01 | 2005-06-16 | Matsushita Electric Industrial Co., Ltd. | Control device and optical disc device having the control device |
-
1988
- 1988-09-14 JP JP11990388U patent/JPH0242214U/ja active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005055213A1 (en) * | 2003-12-01 | 2005-06-16 | Matsushita Electric Industrial Co., Ltd. | Control device and optical disc device having the control device |
| JPWO2005055213A1 (en) * | 2003-12-01 | 2007-06-28 | 松下電器産業株式会社 | CONTROL DEVICE AND OPTICAL DISK DEVICE HAVING CONTROL DEVICE |
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