JPS62147130U - - Google Patents
Info
- Publication number
- JPS62147130U JPS62147130U JP3409486U JP3409486U JPS62147130U JP S62147130 U JPS62147130 U JP S62147130U JP 3409486 U JP3409486 U JP 3409486U JP 3409486 U JP3409486 U JP 3409486U JP S62147130 U JPS62147130 U JP S62147130U
- Authority
- JP
- Japan
- Prior art keywords
- differential amplifier
- recording medium
- output signal
- circuit
- control device
- 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 10
- 238000010586 diagram Methods 0.000 description 6
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案のトラツキング制御装置のブロ
ツク図、第２図はその補正回路のブロツク図、第
３図は従来のトラツキング制御装置のブロツク図
、第４図はその波形図、第５図はその検知素子の
平面図、第６図及び第７図はその特性図である。
１……光源、２……コリメータレンズ、３……
ビームスプリツタ、４……１／４波長板、５……
対物レンズ、６……デイスク、７……モータ、８
……検知素子、９……差動増幅器、１０……加算
回路、１１……イコライザ、１２……バツフアア
ンプ、１３……アクチユエータ、１４……加算回
路、１５……発振器、１６，２０……バンドパス
フイルタ、１７……比較回路、１９……アツテネ
ータ、２１……反転増幅器、３１……スポツト、
４１……加算回路、４２……ループスイツチ、４
３……補正回路、５３……差動増幅器、５４……
比較器、５５……アツプダウンカウンタ、５６…
…クロツク発生器、５８……Ｄ／Ａコンバータ、
５９……ローパスフイルタ。
Fig. 1 is a block diagram of the tracking control device of the present invention, Fig. 2 is a block diagram of its correction circuit, Fig. 3 is a block diagram of a conventional tracking control device, Fig. 4 is its waveform diagram, and Fig. 5 is a block diagram of its correction circuit. A plan view of the sensing element, and FIGS. 6 and 7 are characteristic diagrams thereof. 1...Light source, 2...Collimator lens, 3...
Beam splitter, 4...1/4 wavelength plate, 5...
Objective lens, 6...Disk, 7...Motor, 8
...Detection element, 9...Differential amplifier, 10...Addition circuit, 11...Equalizer, 12...Buffer amplifier, 13...Actuator, 14...Addition circuit, 15...Oscillator, 16, 20...Band Pass filter, 17... Comparison circuit, 19... Attenuator, 21... Inverting amplifier, 31... Spot,
41...Addition circuit, 42...Loop switch, 4
3... Correction circuit, 53... Differential amplifier, 54...
Comparator, 55...Up-down counter, 56...
...Clock generator, 58...D/A converter,
59...Low pass filter.
Claims (1)
上のトラツクに対する情報検出点の位置を検知す
る１対の検知素子と、該検知素子の出力の差信号
を生成する差動増幅器と、該差動増幅器の出力信
号に対応して該情報検出点を駆動する駆動手段と
、該差動増幅器の出力信号の直流成分を検出する
検出回路と、トラツキングサーボループがオープ
ンしている場合における該検出回路の出力に対応
して補正信号を生成する生成回路と、該トラツキ
ングサーボループがクローズしているとき該補正
信号を記憶する記憶回路と、該補正信号を該差動
増幅器の入力に加算する加算回路とを備えること
を特徴とするトラツキング制御装置。 (2) 該検出回路は、該記録媒体が該モータによ
り駆動された状態において、該差動増幅器の出力
信号の直流成分を検出することを特徴とする実用
新案登録請求の範囲第１項記載のトラツキング制
御装置。 (3) 該検出回路は、該記録媒体が該モータによ
り駆動されず、該情報検出点がウオブリングされ
る状態において、該差動増幅器の出力信号の直流
成分を検出することを特徴とする実用新案登録請
求の範囲第１項記載のトラツキング制御装置。[Claims for Utility Model Registration] (1) A motor that drives a recording medium, a pair of detection elements that detect the position of an information detection point with respect to a track on the recording medium, and a difference signal between the outputs of the detection elements. a differential amplifier that generates a differential amplifier, a driving means that drives the information detection point in response to an output signal of the differential amplifier, a detection circuit that detects a DC component of the output signal of the differential amplifier, and a tracking servo loop. a generation circuit that generates a correction signal in response to the output of the detection circuit when the tracking servo loop is open; a storage circuit that stores the correction signal when the tracking servo loop is closed; A tracking control device comprising: an addition circuit that adds to an input of the differential amplifier. (2) The utility model according to claim 1, wherein the detection circuit detects the DC component of the output signal of the differential amplifier while the recording medium is being driven by the motor. Tracking control device. (3) A utility model characterized in that the detection circuit detects the DC component of the output signal of the differential amplifier in a state where the recording medium is not driven by the motor and the information detection point is wobbling. A tracking control device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3409486U JPS62147130U (en) | 1986-03-10 | 1986-03-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3409486U JPS62147130U (en) | 1986-03-10 | 1986-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62147130U true JPS62147130U (en) | 1987-09-17 |
Family
ID=30842318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3409486U Pending JPS62147130U (en) | 1986-03-10 | 1986-03-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62147130U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5928255A (en) * | 1982-08-05 | 1984-02-14 | Aiwa Co Ltd | Optical information reproducer |
| JPS6066340A (en) * | 1983-09-21 | 1985-04-16 | Ricoh Co Ltd | Recording and reproducing device of optical information |
-
1986
- 1986-03-10 JP JP3409486U patent/JPS62147130U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5928255A (en) * | 1982-08-05 | 1984-02-14 | Aiwa Co Ltd | Optical information reproducer |
| JPS6066340A (en) * | 1983-09-21 | 1985-04-16 | Ricoh Co Ltd | Recording and reproducing device of optical information |
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