JPH073458Y2 - Focus search circuit for optical disc player - Google Patents
Focus search circuit for optical disc playerInfo
- Publication number
- JPH073458Y2 JPH073458Y2 JP1989018463U JP1846389U JPH073458Y2 JP H073458 Y2 JPH073458 Y2 JP H073458Y2 JP 1989018463 U JP1989018463 U JP 1989018463U JP 1846389 U JP1846389 U JP 1846389U JP H073458 Y2 JPH073458 Y2 JP H073458Y2
- Authority
- JP
- Japan
- Prior art keywords
- focus
- focus search
- optical disc
- search circuit
- disc player
- 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.)
- Expired - Fee Related
Links
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は光ディスクプレーヤ等のフォーカスサーチ回路
に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a focus search circuit for an optical disk player or the like.
従来、例えばCDプレーヤ等においては、再生動作を行う
前に光ピックアップの対物レンズを光ディスクに近づ
け、フォーカス点に達したならばフォーカスサーボ回路
を動作させて、対物レンズをこのフォーカス点に保持す
るフォーカスサーチ回路が用いられている。Conventionally, for example, in a CD player or the like, the objective lens of the optical pickup is brought close to the optical disk before performing the reproducing operation, and when the focus point is reached, the focus servo circuit is operated to hold the objective lens at this focus point. A search circuit is used.
この様なフォーカスサーチ回路でフォーカス点を見出せ
ない場合は、このフォーカスサーチ動作をやり直すこと
が行われている。ただし、例えば４回フォーカスサーチ
動作をくり返してもフォーカス点が見つからない場合
は、フォーカス点が見つからないと判断し、その様な表
示を行う。When the focus point cannot be found by such a focus search circuit, the focus search operation is performed again. However, if the focus point is not found even after repeating the focus search operation four times, for example, it is determined that the focus point is not found and such a display is performed.
〔考案が解決しようとする課題〕 ところが、ディスクにキズがあったりすると、この様な
フォーカスサーチ動作を何回くり返してもフォーカス点
は見つからず、無駄になる場合があった。本考案はこの
様な欠点を改良することを目的としてなされたものであ
る。[Problems to be solved by the invention] However, if the disc is scratched, the focus point may not be found no matter how many times such focus search operation is repeated, which is in vain. The present invention has been made with the object of remedying such drawbacks.
本考案による光ディスクプレーヤのフォーカスサーチ回
路は、フォーカス点が見つかるまでフォーカスサーチ動
作を所定回数くり返すフォーカスサーチ手段を有する光
ディスクプレーヤにおいて、上記フォーカスサーチ動作
をくり返す際にデイスクの検出位置を変えてフオーカス
検出させることを特徴とするものである。The focus search circuit of the optical disk player according to the present invention is an optical disk player having a focus search means that repeats the focus search operation a predetermined number of times until a focus point is found. It is characterized in that it is detected.
従って、光ディスクにキズがあても次のフォーカスサー
チ動作はキズのない別の場所について行われるので、高
い確率でフォーカス点を見出すことが出来る。Therefore, even if the optical disc has a flaw, the next focus search operation is performed at another location without a flaw, so that the focus point can be found with high probability.
第１図は本考案の一実施例を示すブロック図である。 FIG. 1 is a block diagram showing an embodiment of the present invention.
図において、モータ７により回転するコンパクトディス
ク１からの光情報はピックアップ２により検出されて、
検出信号処理部３に加えられる。検出信号処理部３では
フォーカスエラー信号をフォーカスサーボ回路６に加え
ると共に、EFM信号をディジタル信号処理部４に加え
る。ディジタル信号処理部４での音楽信号のディジタル
データを復調して出力端子５に導出すると共に、サブコ
ード情報を復調してマイコン８に加える。フォーカスサ
ーボ回路６及びフォーカスサーチ回路９はピックアップ
２の対物レンズを駆動するフォーカスコイルを制御す
る。マイコン８はディジタル信号処理部4,フォーカスサ
ーボ回路6,モータ７及びフォーカスサーチ回路９を制御
する。In the figure, the optical information from the compact disc 1 rotated by the motor 7 is detected by the pickup 2,
It is added to the detection signal processing unit 3. The detection signal processing unit 3 applies the focus error signal to the focus servo circuit 6 and the EFM signal to the digital signal processing unit 4. The digital data of the music signal in the digital signal processing unit 4 is demodulated and led to the output terminal 5, and the subcode information is demodulated and added to the microcomputer 8. The focus servo circuit 6 and the focus search circuit 9 control the focus coil that drives the objective lens of the pickup 2. The microcomputer 8 controls the digital signal processing unit 4, the focus servo circuit 6, the motor 7 and the focus search circuit 9.
以上の様な構成による動作を第２図のフローチャートを
参照しながら以下詳細に説明する。The operation of the above configuration will be described in detail below with reference to the flowchart of FIG.
図において、CDプレーヤに光ディスク１を挿入して再生
動作を行わせると、先ず周知のフォーカスサーチステッ
プS1が行われる。即ち、マイコン８はステップS1におい
てフォーカスサーチ回路９によりピックアップ２の対物
レンズを光ディスク１に近づける。ステップS2において
フォーカス点に達したかどうかを判定する。フォーカス
点に達したことを検出した場合はステップS6でフォーカ
スサーボ回路６を動作させて、対物レンズの位置をフォ
ーカス点に維持させる。ステップS2でフォーカス点が検
出出来なかった場合は、ステップS3に移行し、このステ
ップS3への移行回数が４回以下であると、次のステップ
S5に移行し、モータ７を制御して光ディスク１を約半回
転させる。このあと再びステップS1に移行させて、フォ
ーカスサーチ回路９を再び動作させ、以上の各ステップ
をくり返す。ステップS3への移行が４回に達するとステ
ップS4に移行し、フォーカスがとれないことを図示せぬ
表示回路に表示させる。In the figure, when the optical disc 1 is inserted into the CD player and a reproducing operation is performed, a well-known focus search step S 1 is first performed. That is, the microcomputer 8 causes the focus search circuit 9 to bring the objective lens of the pickup 2 closer to the optical disc 1 in step S 1 . In step S 2 , it is determined whether or not the focus point is reached. If it is detected that reaches the focus point by operating the focus servo circuit 6 in step S 6, to maintain the position of the objective lens in the focus point. If the focus point could not be detected in step S 2, the process proceeds to step S 3, the number of transitions to the step S 3 is less than 4 times, the next step
Proceeds to S 5, is about half turn of the optical disk 1 by controlling the motor 7. After that, the process proceeds to step S 1 again, the focus search circuit 9 is operated again, and the above steps are repeated. When the transition to step S 3 reaches four times the process proceeds to step S 4, it is displayed on the display circuit (not shown) that focus can not be obtained.
以上の様に本考案によれば、光デイスクの検出位置を変
えてフオーカスサーチ動作を成すので光デイスクに多少
のキズがあってもフオーカスサーチを確実に行うことが
できる。As described above, according to the present invention, since the focus search operation is performed by changing the detection position of the optical disk, the focus search can be surely performed even if the optical disk has some scratches.
第１図は本考案の一実施例を示すブロック図、第２図は
その動作を示すフローチャートである。 １……光ディスク ２……ピックアップ ３……検出信号処理部 ６……フォーカスサーボ回路 ７……モータ ８……マイコン ９……フォーカスサーチ回路FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a flow chart showing its operation. 1 ... Optical disc 2 ... Pickup 3 ... Detection signal processing unit 6 ... Focus servo circuit 7 ... Motor 8 ... Microcomputer 9 ... Focus search circuit
Claims (1)
に光ピツクアツプをフオーカスサーチする手段と、上記
フオーカスサーチがされたときにはフオーカスサーボを
オンにする手段と、上記フオーカスサーチがされなかっ
たときは上記光デイスクを回転し停止させて上記光デイ
スクの先に上記フオーカスサーチさせた位置とは異なる
位置で再び上記フオーカスサーチをする手段と、さらに
上記光デイスクのそれぞれ異なった位置で所定の回数上
記フオーカスサーチを繰り返して上記フオーカスサーボ
がオンに成らないときにはフオーカスサーボがオンしな
いことを表示する手段を具備することを特徴とする光デ
イスクプレーヤのフオーカスサーチ回路。In an optical disc player, a means for performing a focus search for an optical pickup on the optical disk, a means for turning on a focus servo when the focus search is performed, and a means for not performing the focus search Means for performing the focus search again at a position different from the position where the focus search is performed ahead of the optical disc by rotating and stopping the optical disc, and at predetermined positions at different positions of the optical disc. A focus search circuit for an optical disc player, comprising means for indicating that the focus servo is not turned on when the focus servo is not turned on after repeating the focus search a number of times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989018463U JPH073458Y2 (en) | 1989-02-21 | 1989-02-21 | Focus search circuit for optical disc player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1989018463U JPH073458Y2 (en) | 1989-02-21 | 1989-02-21 | Focus search circuit for optical disc player |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02110021U JPH02110021U (en) | 1990-09-03 |
| JPH073458Y2 true JPH073458Y2 (en) | 1995-01-30 |
Family
ID=31233141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1989018463U Expired - Fee Related JPH073458Y2 (en) | 1989-02-21 | 1989-02-21 | Focus search circuit for optical disc player |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH073458Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441612B2 (en) * | 1971-08-17 | 1979-12-10 | ||
| JPS61269230A (en) * | 1985-05-23 | 1986-11-28 | Hitachi Ltd | Laser controlling system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441612U (en) * | 1977-08-29 | 1979-03-20 |
-
1989
- 1989-02-21 JP JP1989018463U patent/JPH073458Y2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5441612B2 (en) * | 1971-08-17 | 1979-12-10 | ||
| JPS61269230A (en) * | 1985-05-23 | 1986-11-28 | Hitachi Ltd | Laser controlling system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02110021U (en) | 1990-09-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |