JPS623437A - Information recording and reproducing device - Google Patents
Information recording and reproducing deviceInfo
- Publication number
- JPS623437A JPS623437A JP14172085A JP14172085A JPS623437A JP S623437 A JPS623437 A JP S623437A JP 14172085 A JP14172085 A JP 14172085A JP 14172085 A JP14172085 A JP 14172085A JP S623437 A JPS623437 A JP S623437A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- lens
- objective lens
- error signal
- track
- 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
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野Ｊ
本発明は情報記録再生装置に関し、特にトラ・ツクアク
セス時のレンズ振れを押さえる情報記録再生装置に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application J] The present invention relates to an information recording/reproducing apparatus, and more particularly to an information recording/reproducing apparatus that suppresses lens shake during track access.
Ｌ′従来の技術〕
従来、この種の情報記録再生装置は、記録再生用の媒体
に対するトラックアクセスに際して、まず光ヘツド移動
機構により光ヘツド全体の粗い位置決めを行い、次にレ
ンズ駆動機構により対物レンズのｍｓな位置決めを行っ
ていた。この光ヘツド移動機構の粗い位置決めの際に、
移動時の加速または減速により、対物レンズに加速度が
加わるため、対物レンズが振られて振動してしまう。従
って、次の対物レンズによる微細な位置決めの際に、安
定な１ヘラ・ツク引込動作ができなかった。L'Prior Art] Conventionally, in this type of information recording/reproducing apparatus, when accessing a track on a recording/reproducing medium, first the optical head moving mechanism roughly positions the entire optical head, and then the lens driving mechanism moves the objective lens. ms positioning was performed. When roughly positioning this optical head moving mechanism,
Acceleration or deceleration during movement applies acceleration to the objective lens, causing the objective lens to shake and vibrate. Therefore, during the next fine positioning using the objective lens, a stable one-hitter retraction operation could not be performed.
上述した従来の情報記録再生装置は、光ヘツド移動機構
の移動によって対物レンズが振られるため、トラック引
込みの際に対物レンズの振れが少なくなるのを待つか、
あるいは対物レンズ位置検出手段を光ヘツド部分に設け
なければならないので、高速アクセスができず、かつ光
ヘツド全体の軽量化および小型化ができないなどの欠点
があった。In the conventional information recording and reproducing apparatus described above, since the objective lens is swayed by the movement of the optical head moving mechanism, it is necessary to wait until the oscillation of the objective lens decreases when pulling in the track.
Alternatively, since the objective lens position detection means must be provided in the optical head, there are drawbacks such as not allowing high-speed access and making it impossible to reduce the weight and size of the entire optical head.
本発明の情報記録再生装置は、情報を光学的に記録再生
するための媒体と、回転する前記媒体に対物レンズを介
して光スポットを照射する光学手段と、前記媒体からの
反射光を受光して前記情報を電気信号に変換する光検出
手段と、前期光検出手段の出力信号の一部からトラ・ツ
ク誤差信号を作り出す信号作成手段と、前記トラック誤
差信号のＩＥ極性信号および負極性信号をそれぞれ包絡
線検波する２組の包絡線検波手段と、前記２組の包絡線
検波手段の、それぞれの出力信号を加算してレンズ位置
信号を得る加算手段と、前記レンズ位置信号により前記
対物レンズ分駆動するための駆動手段と、前記駆動手段
の出力信号により前記対物レンズを前記媒体に対して最
適位置に移動させるためのトラッキング手段とを備えて
いる。The information recording and reproducing apparatus of the present invention includes a medium for optically recording and reproducing information, an optical means for irradiating a light spot onto the rotating medium through an objective lens, and receiving reflected light from the medium. a photodetection means for converting the information into an electrical signal; a signal generation means for producing a track error signal from a part of the output signal of the photodetection means; and an IE polarity signal and a negative polarity signal of the track error signal. two sets of envelope detection means each detecting an envelope; an addition means for adding the respective output signals of the two sets of envelope detection means to obtain a lens position signal; The apparatus includes a driving means for driving, and a tracking means for moving the objective lens to an optimal position with respect to the medium based on an output signal of the driving means.
次に、本発明ついて図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の一実施例のブロック図、第２図は本実
施例のレンズ振れ量と１〜ラック誤差信号の関係を示す
グラフ、第３図（ａ）ないしくｄ）は本実施例のトラッ
ク誤差信号からレンズ位置信号を得る過程をそれぞれ示
す波形図である。Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 is a graph showing the relationship between the lens shake amount and the 1 to rack error signal of this embodiment, and Fig. 3 (a) to d) is a graph of the present embodiment. FIG. 6 is a waveform chart showing a process of obtaining a lens position signal from an example tracking error signal.
記録再生用の媒体１に照射されたレーザ光源２の反射光
は、対物レンズ４およびビームスプリッタ５を径で、２
分割の光検出器６に入射する。光検出器６からの２つの
出力は、それぞれ前置増幅器７および８を経て、差動増
幅器９に入り、トラック誤差信号１０１となる。このト
ラック誤差信号１０１は、正極性信号の包絡線検波器１
０と、負極性信号の包絡線検波器１１とに入力される。The reflected light from the laser light source 2 irradiated onto the recording and reproducing medium 1 passes through the objective lens 4 and the beam splitter 5 with a diameter of 2.
The light enters the divided photodetector 6. The two outputs from the photodetector 6 pass through preamplifiers 7 and 8, respectively, and enter a differential amplifier 9, resulting in a tracking error signal 101. This tracking error signal 101 is detected by the envelope detector 1 of the positive polarity signal.
0 and is input to the envelope detector 11 of the negative polarity signal.
包絡線検波器１０および１１の出力は加算増幅器１２に
入力され、レンズ位置信号１０２が作られる。The outputs of envelope detectors 10 and 11 are input to summing amplifier 12 to produce lens position signal 102.
レンズ位置信号１０２はアナログスイッチ１３分径でレ
ンズ駆動回路１４に入力され、レンズ駆動回路１４の出
力によってトラッキングアクチュエータ３を駆動し、対
物レンズ・４の位置決めを行・）。なおアナログスイッ
チ１３は、図示しない手段によって切換えられるサーボ
切換信号１０３の状態に応じて動作する。即ち、対物レ
ンズ４、ビームスプリッタ５などの光学素子を実装した
光ヘツド移動機構が動いている間のみ、サーボ切換信号
１０３は″′ハイ″となり、このときレンズ位置信号１
０２．がレンズ駆動回路１４へ伝えられて、対物レンズ
４の位置決めを行う、サーボ切換信号１０３が゛ロー″
“のときは、トラック誤差信号１０１が直接、レンズ駆
動回路１４へ伝えられ、このとき対物レンズ４はトラッ
ク追従動作を行う。The lens position signal 102 is input to the lens drive circuit 14 at the diameter of the analog switch 13, and the output of the lens drive circuit 14 drives the tracking actuator 3 to position the objective lens 4. Note that the analog switch 13 operates according to the state of the servo switching signal 103, which is switched by means not shown. That is, the servo switching signal 103 becomes "high" only while the optical head moving mechanism mounted with optical elements such as the objective lens 4 and the beam splitter 5 is moving, and at this time the lens position signal 1
02. is transmitted to the lens drive circuit 14 to position the objective lens 4. The servo switching signal 103 is "low".
``, the tracking error signal 101 is directly transmitted to the lens drive circuit 14, and at this time the objective lens 4 performs a track following operation.
次に、第１図ないし第３図を参照して、１〜う・ツク誤
差信号１０１からレンズ位置信号１０２を求める動作を
、順を追って説明する。Next, the operation of determining the lens position signal 102 from the 1 to 3 error signals 101 will be explained in order with reference to FIGS. 1 to 3.
第２図に示すように、対物レンズ４のレンズ振れ債に比
例して、トラック誤差信号１０１の直流成分が発生する
。従って、この直流成分を求めれば、対物レンズ４のレ
ンズ振れ量を求めることかできることになる。As shown in FIG. 2, a DC component of the tracking error signal 101 is generated in proportion to the lens deflection of the objective lens 4. Therefore, by determining this DC component, the amount of lens deflection of the objective lens 4 can be determined.
次に、第３図に示すように、光ヘツド移動機構が移動す
る際には、トラックサーボはオフであるから、光ヘツド
移動機構の加速および減速時におけるトラック誤差信号
１０１は同図＜１）のようになる。このとき、トラック
誤差信号１０１の正極性成分および負極性成分のみをそ
れぞれ包絡線検波すると同図（ｂ）および（ｃ）に示す
検波信号１０４および１０５となり、それぞれレンズ振
れ量ａ。およびａ□ ｌ・ラック誤差信号１０１の片側
振幅成分す、およびす、ｃ を持つことになる。即ち
、検波信号１０４はａｕ＋ｂｕ、検波信号１０５はａｘ
−１）７ となる。ここでトラック誤差信号１０１
の直流成分のみを取出してｌｂ、１＝ｌｂｉ ｌとし、
なおかつｂｌ、とす、２の周波数特性が等しいとすれば
、同図（ｄ）に示すように、加算増幅器１２の出力であ
るレンズ位置信号］０２はａＵ＋ａ！となり、これは対
物レンズ４のレンズ振れ量、つまり対物レンズ４の位置
を表わす信号となる。Next, as shown in FIG. 3, since the track servo is off when the optical head moving mechanism moves, the tracking error signal 101 during acceleration and deceleration of the optical head moving mechanism is <1) in the figure. become that way. At this time, when only the positive polarity component and the negative polarity component of the tracking error signal 101 are envelope-detected, respectively, the detected signals 104 and 105 shown in FIGS. 12(b) and 10(c) are obtained, and the lens shake amount a is obtained. and a□ l. One-sided amplitude components of the rack error signal 101, S, and S, c. That is, the detected signal 104 is au+bu, and the detected signal 105 is ax
-1) 7. Here, the tracking error signal 101
Take out only the DC component and set it as lb, 1=lbi l,
Furthermore, assuming that the frequency characteristics of bl, and 2 are equal, the lens position signal ]02 which is the output of the summing amplifier 12 is aU+a!, as shown in FIG. This becomes a signal representing the amount of lens deflection of the objective lens 4, that is, the position of the objective lens 4.
このようにして、対物レンズ４のレンズ振れ量は、１〜
ラック誤差信号１０１の周波数特性に影響されず、安定
に得られる。In this way, the amount of lens deflection of the objective lens 4 is 1 to 1.
It is not affected by the frequency characteristics of the rack error signal 101 and can be stably obtained.
従って、光ヘツド移動機構の移動時にレンズ位置信号１
０２をアナログスイッチ１３を径でレンズ駆動回路１４
に入力すれば、トラッキングアクチュエータ３の動作に
より、光ヘツド移動機構の加速および減速時における外
乱に対して、常に最適の位置に対物レンズ４を保持する
ことが可能となり、安定なトラック引込動作が可能とな
る。Therefore, when the optical head moving mechanism moves, the lens position signal 1
02 is the analog switch 13 and the lens drive circuit 14 is the diameter.
If input to becomes.
以上説明したように本発明は、光ヘツド移動機構の移動
動作時のトラック誤差信号からレンズ位置信号を作り、
対物レンズの位置が常に一定の位置に保たれるようにサ
ーボをかけることにより、光ヘツド移動機構の移動直後
における対物レンズの振動を押さえることができ、常に
安定なトラック引込動作ができるため、トラックの高速
アクセスが可能となり、光ヘツド全体の構造を簡単かつ
小型軽量化することができる効果がある。As explained above, the present invention generates a lens position signal from a tracking error signal during the movement operation of an optical head movement mechanism, and
By applying a servo so that the position of the objective lens is always kept at a constant position, it is possible to suppress the vibration of the objective lens immediately after the movement of the optical head moving mechanism, and a stable track retracting operation is always possible. This has the effect of allowing high-speed access to the optical head, and making it possible to simplify, reduce the size and weight of the entire optical head structure.
第１図は本発明の一実施例のブロック図、第２図は本実
施例のレンズ振れ量とトラック誤差信号の関係を示すグ
ラフ、第３図（＆）ないしくｄ）は本実施例のトラック
誤差信号からレンズ位置信号を得る過程をそれぞれ示す
波形図である。
■・・・媒体、２・・・レーザ光源、３・・・トラッキ
ングアクチュエータ、４・・・対物レンズ、５・・・ビ
ームスプリッタ、６・・・光検出器、７．８・・・前置
増幅器、９・・・差動増幅器、１０．１１・・・包絡線
検波器、１２・・・加算増幅器、１３・・・アナログス
イッチ、１４・・・レンズ駆動回路、１０１・・・トラ
ック誤差信号、１０２・・・レンズ位置信号、１０３・
・・サーボ切換信号、１０４，１０５・・・検波信号。
第２図FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a graph showing the relationship between the lens shake amount and the tracking error signal of this embodiment, and FIG. FIG. 6 is a waveform chart showing the process of obtaining a lens position signal from a tracking error signal. ■...Medium, 2...Laser light source, 3...Tracking actuator, 4...Objective lens, 5...Beam splitter, 6...Photodetector, 7.8...Preface Amplifier, 9...Differential amplifier, 10.11...Envelope detector, 12...Summing amplifier, 13...Analog switch, 14...Lens drive circuit, 101...Track error signal , 102... Lens position signal, 103...
...Servo switching signal, 104,105...Detection signal. Figure 2
Claims (1)
記媒体に対物レンズを介して光スポットを照射する光学
手段と、前記媒体からの反射光を受光して前記情報を電
気信号に変換する光検出手段とを備える情報記録再生装
置において、前記光検出手段の出力信号の一部からトラ
ック誤差信号を作り出す信号作成手段と、前記トラック
誤差信号の正極性信号および負極性信号をそれぞれ包絡
線検波する２組の包絡線検波手段と、前記２組の包絡検
波手段のそれぞれの出力信号を加算してレンズ位置信号
を得る加算手段と、前記レンズ位置信号により前記対物
レンズを駆動するための駆動手段と、前記駆動手段の出
力信号により前記対物レンズを前記媒体に対して最適位
置に移動させるためのトラッキング手段とを備えること
を特徴とする情報記録再生装置。A medium for optically recording and reproducing information; an optical means for irradiating a light spot onto the rotating medium through an objective lens; and receiving reflected light from the medium and converting the information into an electrical signal. an information recording/reproducing apparatus comprising: a signal generating means for generating a tracking error signal from a part of the output signal of the optical detecting means; and envelope detection for a positive polarity signal and a negative polarity signal of the tracking error signal, respectively. two sets of envelope detection means, an addition means for adding respective output signals of the two sets of envelope detection means to obtain a lens position signal, and a driving means for driving the objective lens using the lens position signal. and a tracking means for moving the objective lens to an optimal position with respect to the medium using an output signal from the driving means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14172085A JPS623437A (en) | 1985-06-28 | 1985-06-28 | Information recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14172085A JPS623437A (en) | 1985-06-28 | 1985-06-28 | Information recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS623437A true JPS623437A (en) | 1987-01-09 |
Family
ID=15298631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14172085A Pending JPS623437A (en) | 1985-06-28 | 1985-06-28 | Information recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS623437A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5930221A (en) * | 1995-08-07 | 1999-07-27 | Fujitsu Limited | Optical storage device made thinner by substituting electrical means for capabilities of sensors |
| US7727200B2 (en) | 1998-08-17 | 2010-06-01 | Yutaka Suzuki | Method of gastrostomy, and an infection preventive cover, kit or catheter kit, and a gastrostomy catheter kit |
-
1985
- 1985-06-28 JP JP14172085A patent/JPS623437A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5930221A (en) * | 1995-08-07 | 1999-07-27 | Fujitsu Limited | Optical storage device made thinner by substituting electrical means for capabilities of sensors |
| US5978330A (en) * | 1995-08-07 | 1999-11-02 | Fujitsu Limited | Optical storage device made thinner by substituting electrical means for capabilities of sensors |
| US6292444B1 (en) | 1995-08-07 | 2001-09-18 | Fujitsu Limited | Optical storage device made thinner by substituting electrical means for capabilities of sensors |
| US7727200B2 (en) | 1998-08-17 | 2010-06-01 | Yutaka Suzuki | Method of gastrostomy, and an infection preventive cover, kit or catheter kit, and a gastrostomy catheter kit |
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