JPS6290419U - - Google Patents
Info
- Publication number
- JPS6290419U JPS6290419U JP18040985U JP18040985U JPS6290419U JP S6290419 U JPS6290419 U JP S6290419U JP 18040985 U JP18040985 U JP 18040985U JP 18040985 U JP18040985 U JP 18040985U JP S6290419 U JPS6290419 U JP S6290419U
- Authority
- JP
- Japan
- Prior art keywords
- focusing
- circuit
- optical
- search signal
- reading beam
- 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 9
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 claims 5
- 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線図
、第２図及び第３図は夫々集束サーチ時の集束誤
差信号の波形を示す波形図である。
３はレベル検出回路、７はホールド回路、８は
可変利得増幅回路、１０は集束サーチ信号発生回
路、１１は切り換えスイツチ、１３は集束コイル
である。
FIG. 1 is a block diagram showing one embodiment of the present invention, and FIGS. 2 and 3 are waveform diagrams showing the waveform of a focusing error signal during focusing search, respectively. 3 is a level detection circuit, 7 is a hold circuit, 8 is a variable gain amplifier circuit, 10 is a focused search signal generation circuit, 11 is a changeover switch, and 13 is a focusing coil.
Claims (1)
報を読み取る光学式ピツクアツプの読み取り用ビ
ームの集束を制御する集束制御手段と、上記読み
取り用ビームの集束状態を検出する集束誤差検出
手段と、集束サーチのためのサーチ信号を発生す
る集束サーチ信号発生回路と、上記集束誤差検出
手段よりの検出出力を増幅する増幅回路と、該増
幅回路の増幅出力及び上記集束サーチ信号発生回
路よりの集束サーチ信号を上記集束制御手段に切
り換え供給する切り換えスイツチとを有する光学
式再生装置の集束サーボ装置に於いて、 上記増幅回路を可変利得増幅回路にて構成する
と共に、 上記光学式ピツクアツプの上記読み取り用ビー
ムの集束サーチ時に於ける上記集束誤差検出手段
よりの検出出力のレベルを検出するレベル検出回
路を有し、 該レベル検出回路の検出出力により上記可変利
得増幅回路の利得を設定するようにしたことを特
徴とする光学式再生装置の集束サーボ装置。[Claims for Utility Model Registration] Focusing control means for controlling the focusing of a reading beam of an optical pickup that reads recorded information of an optical recording medium on which information signals are recorded, and detecting the focusing state of the reading beam. a focusing error detection means, a focused search signal generation circuit that generates a search signal for a focused search, an amplifier circuit that amplifies a detection output from the focusing error detection means, an amplified output of the amplifier circuit and the focused search signal. In a focusing servo device for an optical reproducing device having a changeover switch for switching and supplying a focused search signal from a generating circuit to the focusing control means, the amplifying circuit is constituted by a variable gain amplifying circuit, and the optical It has a level detection circuit that detects the level of the detection output from the focusing error detection means during the focus search of the reading beam of the pickup, and the gain of the variable gain amplifier circuit is set by the detection output of the level detection circuit. A focusing servo device for an optical reproducing device, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040985U JPS6290419U (en) | 1985-11-22 | 1985-11-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18040985U JPS6290419U (en) | 1985-11-22 | 1985-11-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6290419U true JPS6290419U (en) | 1987-06-10 |
Family
ID=31124338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18040985U Pending JPS6290419U (en) | 1985-11-22 | 1985-11-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6290419U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60138739A (en) * | 1983-12-27 | 1985-07-23 | Sony Corp | Focus servo circuit of optical disc player |
-
1985
- 1985-11-22 JP JP18040985U patent/JPS6290419U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60138739A (en) * | 1983-12-27 | 1985-07-23 | Sony Corp | Focus servo circuit of optical disc player |
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