JPS63176924U - - Google Patents
Info
- Publication number
- JPS63176924U JPS63176924U JP445787U JP445787U JPS63176924U JP S63176924 U JPS63176924 U JP S63176924U JP 445787 U JP445787 U JP 445787U JP 445787 U JP445787 U JP 445787U JP S63176924 U JPS63176924 U JP S63176924U
- Authority
- JP
- Japan
- Prior art keywords
- disk
- focus servo
- signal
- focus
- optical disc
- 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 7
- 230000007547 defect Effects 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000005764 inhibitory process Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案にかかるＣＤプレーヤの要部ブ
ロツク図、第２図はフオーカスサーボ回路のブロ
ツク図、第３図は本考案にかかるＣＤプレーヤの
別のブロツク図、第４図乃至第６図は従来技術の
欠点を説明するための波形図である。
１１…コンパクトイスク、１２…光ピツクアツ
プ、１３…ＲＦアンプ、１５…フオーカスサーボ
制御部、１６…スピンドルモータ、１８…デイフ
エクト検出回路、１８ａ…エンベロープ検出回路
、１９…デイフエクトコントロール回路、１９ａ
…同期符号検出回路。
FIG. 1 is a block diagram of the main parts of the CD player according to the present invention, FIG. 2 is a block diagram of the focus servo circuit, FIG. 3 is another block diagram of the CD player according to the present invention, and FIGS. 4 to 6 The figure is a waveform diagram for explaining the drawbacks of the prior art. DESCRIPTION OF SYMBOLS 11... Compact disk, 12... Optical pickup, 13... RF amplifier, 15... Focus servo control section, 16... Spindle motor, 18... Defect detection circuit, 18a... Envelope detection circuit, 19... Defect control circuit, 19a
...Synchronization code detection circuit.
Claims (1)
するようにフオーカスエラー信号を発生してフオ
ーカスサーボ制御を行うフオーカスサーボ制御部
と、 光ピツクアツプから出力されるＲＦ信号を用い
てデイスク上のキズを検出した時、前記フオーカ
スサーボ制御を停止させる信号を発生するデイフ
エクト検出部と、 デイスクの回転速度が所定の線速度以下ではデ
イフエクト検出部による前記フオーカスサーボ制
御に対する機能を無能にする制御回路を備えて成
ることを特徴とする光学式デイスクプレーヤ。 (2) 前記制御回路は、デイスクに記録されてい
る同期符号を検出する同期符号検出回路と、同期
符号を検出する迄デイフエクト検出部からフオー
カスサーボ停止信号が発生するのを禁止する禁止
回路を有することを特徴とする実用新案登録請求
の範囲第(1)項記載の光学式デイスクプレーヤ。 (3) 前記制御回路は、デイスクの回転開始から
の時間を計時するタイマーと、計時開始から所定
時間経過する迄はデイフエクト検出部からフオー
カスサーボ停止信号が発生するのを禁止する禁止
回路を有することを特徴とする実用新案登録請求
の範囲第(1)項記載の光学式デイスクプレーヤ。[Scope of Claim for Utility Model Registration] (1) A focus servo control unit that generates a focus error signal and performs focus servo control so that the focus of the objective lens matches the reflective surface of the disk, and a defect detection section that generates a signal to stop the focus servo control when a scratch on the disk is detected using an RF signal; An optical disc player comprising a control circuit that disables a servo control function. (2) The control circuit includes a synchronization code detection circuit that detects a synchronization code recorded on the disk, and an inhibition circuit that prohibits generation of a focus servo stop signal from the defect detection section until the synchronization code is detected. An optical disc player according to claim (1) of the utility model registration claim. (3) The control circuit includes a timer that measures time from the start of rotation of the disk, and a prohibition circuit that prohibits the focus servo stop signal from being generated from the defect detection section until a predetermined period of time has elapsed from the start of the time measurement. An optical disc player according to claim (1) of the utility model registration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP445787U JPH0528571Y2 (en) | 1987-01-16 | 1987-01-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP445787U JPH0528571Y2 (en) | 1987-01-16 | 1987-01-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63176924U true JPS63176924U (en) | 1988-11-16 |
| JPH0528571Y2 JPH0528571Y2 (en) | 1993-07-22 |
Family
ID=30785137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP445787U Expired - Lifetime JPH0528571Y2 (en) | 1987-01-16 | 1987-01-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0528571Y2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284116U (en) * | 1988-12-16 | 1990-06-29 | ||
| JPH0312825A (en) * | 1989-06-09 | 1991-01-21 | Onkyo Corp | Focusing device and optical disk discrimination device |
-
1987
- 1987-01-16 JP JP445787U patent/JPH0528571Y2/ja not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0284116U (en) * | 1988-12-16 | 1990-06-29 | ||
| JPH0312825A (en) * | 1989-06-09 | 1991-01-21 | Onkyo Corp | Focusing device and optical disk discrimination device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528571Y2 (en) | 1993-07-22 |
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