JPS5875343U - Optical disk recording/playback device - Google Patents
Optical disk recording/playback deviceInfo
- Publication number
- JPS5875343U JPS5875343U JP17057481U JP17057481U JPS5875343U JP S5875343 U JPS5875343 U JP S5875343U JP 17057481 U JP17057481 U JP 17057481U JP 17057481 U JP17057481 U JP 17057481U JP S5875343 U JPS5875343 U JP S5875343U
- Authority
- JP
- Japan
- Prior art keywords
- lens
- disk surface
- recording
- servo
- response
- 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
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図はこの考案の一実施例を示す回路構成図、第２図
は第１図の動作説明に供するための信号波形図である。
１は光ディスク、２はアクチュエータ、７はフォーカス
サーボ回路、９はＤ型フリップフロップ回路、１０はス
イッチ回路、１１はＪＫ型フリップフロップ回路、１３
は時定数回路、１４はゼロクロスコンパレータ、１５は
ナンド回路であ、る。FIG. 1 is a circuit configuration diagram showing an embodiment of this invention, and FIG. 2 is a signal waveform diagram for explaining the operation of FIG. 1. 1 is an optical disk, 2 is an actuator, 7 is a focus servo circuit, 9 is a D-type flip-flop circuit, 10 is a switch circuit, 11 is a JK-type flip-flop circuit, 13
1 is a time constant circuit, 14 is a zero cross comparator, and 15 is a NAND circuit.
Claims (1)
光を得、該反射光の相対位置に応じた位置検知出力を得
、該位置検知出力により光デイスク面に対する上面レン
ズの位置を制御するフォーカスサーボ回路を有する光デ
イスク記録再生装置において、第１指令信号に応答して
記録又は再生の開始直前に上記フォーカスサーボ回路を
不動作状態とし、第２指令信号に関連して上記フォーカ
スサーボ回路を動作状態とするサーボ制御手段と、上記
第１指令信号に応答してレンズをサーボ目標位置よりデ
ィスク面から離間させ、上記レンズが上記ディスク面上
の記録又は再生開始位置に来たときに第２指令信号に応
答して上記ディスク面から離間したレンズを上記記録又
は再生開始位置で徐々に上記ディスク面に接近させる位
置制御手段と、上記レンズが上記サーボ目標位置を通過
した時点で上記フォーカスサーボ回路が動作状態となる
よう上記サーボ制御手段を付勢するサーボ目標 ′
位置検出手段とを具備して成る光デイスク記録再生装置
。A laser beam is irradiated onto the optical disk surface through a lens to obtain reflected light, a position detection output is obtained according to the relative position of the reflected light, and the position of the upper lens with respect to the optical disk surface is controlled by the position detection output. In an optical disk recording/reproducing apparatus having a focus servo circuit, the focus servo circuit is rendered inactive immediately before the start of recording or reproduction in response to a first command signal, and the focus servo circuit is rendered inactive in response to a second command signal. a servo control means for setting the lens into an operating state; and a second servo control means for moving the lens away from the disk surface from the servo target position in response to the first command signal, and when the lens reaches a recording or reproduction start position on the disk surface. a position control means for causing the lens separated from the disk surface to gradually approach the disk surface at the recording or reproduction start position in response to a command signal; and the focus servo circuit when the lens passes the servo target position. a servo target that energizes the servo control means such that
An optical disc recording/reproducing device comprising a position detecting means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17057481U JPS5875343U (en) | 1981-11-16 | 1981-11-16 | Optical disk recording/playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17057481U JPS5875343U (en) | 1981-11-16 | 1981-11-16 | Optical disk recording/playback device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5875343U true JPS5875343U (en) | 1983-05-21 |
Family
ID=29962528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17057481U Pending JPS5875343U (en) | 1981-11-16 | 1981-11-16 | Optical disk recording/playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5875343U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54128707A (en) * | 1978-03-27 | 1979-10-05 | Mca Disco Vision | Focus servo device |
-
1981
- 1981-11-16 JP JP17057481U patent/JPS5875343U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54128707A (en) * | 1978-03-27 | 1979-10-05 | Mca Disco Vision | Focus servo device |
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