JPS60136927A - Optical spot controller in optical tape device - Google Patents

Optical spot controller in optical tape device

Info

Publication number
JPS60136927A
JPS60136927A JP24397983A JP24397983A JPS60136927A JP S60136927 A JPS60136927 A JP S60136927A JP 24397983 A JP24397983 A JP 24397983A JP 24397983 A JP24397983 A JP 24397983A JP S60136927 A JPS60136927 A JP S60136927A
Authority
JP
Japan
Prior art keywords
medium
optical
optical tape
track
detection section
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
Application number
JP24397983A
Other languages
Japanese (ja)
Inventor
Masamichi Ito
正道 伊藤
Koji Ichikawa
市川　厚司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP24397983A priority Critical patent/JPS60136927A/en
Publication of JPS60136927A publication Critical patent/JPS60136927A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
    • G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
    • G11B7/0031—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent using a rotating head, e.g. helicoidal recording

Abstract

PURPOSE:To attain high speed focus position control by forecasting the position of an object track of light spot when an optical tape is transferred from an intermittent region to the next scanning region. CONSTITUTION:A control system 8 detects an out of focus signal from a focus position detecting section 10 so as to control a focal position controlling lens 5. A control system 9 is provided so that the optical tape 6 is transferred to the scanning region and the focus is matched to the position of the object track, and an optical tape presence detecting section 14 detects a region where the optical tape 6 is intermittent so as to drive the lens 5. A just focus detecting circuit 18 is provided to switch the control system 8, 9 by means of an analog switch 17. The lens 5 is driven in high speed when the region is transferred to the scanning region so as to move the focus position thereby matching the focus onto the optical tape 6. Then the control system 8 conducts the focus position control, and when the optical tape 6 is intermittent, the control is taken over to the control system 9 so as to retract the remotest end and bring it in the standby state.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は光テープ装置のための光スポツト制御に係り、
特に反射光が周期的にとぎれる場合に好適な光スポット
の焦点位置制御とトラック位置制御をするための高速光
スポット制御方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to optical spot control for an optical tape device,
In particular, the present invention relates to a high-speed light spot control method for controlling the focus position and track position of a light spot, which is suitable when reflected light is interrupted periodically.

〔発明の背景〕[Background of the invention]

光テープ装置は光ビームの強弱によってテープ状の媒体
である光テープに情報を記憶し、再生する装置である。An optical tape device is a device that stores and reproduces information on an optical tape, which is a tape-shaped medium, by varying the intensity of a light beam.

この種装置としては、例えば特開昭５７−６４３３３号
に開示されたものがある。しかし、このような光記録再
生方式においては、光テープは回転ヘッドの約半分に巻
付けられたいわゆるΩ巻きのため、光ビームの反射光が
戻らない領域が生じる。この領域をなくしする手段とし
て、光テープを回転ヘッドの全周に巻付けるいわゆるα
巻きで、しかも光テープのエッチを合わせるようにすれ
ばよい。しかしこの方式にすると、光テープに傷が付き
易くなるし、ゴミが出易くなる。そのためα巻きの場合
においても、光テープに領域をもうけて光ヘッドに巻き
付ける方式にする必要がある。An example of this type of device is disclosed in Japanese Patent Application Laid-Open No. 57-64333. However, in such an optical recording and reproducing system, since the optical tape is wound around about half of the rotary head in a so-called Ω-wrap, there is a region where the reflected light beam does not return. As a means to eliminate this area, optical tape is wrapped around the entire circumference of the rotating head.
All you have to do is roll it up and match the edges of the optical tape. However, if this method is used, the optical tape is likely to be damaged and dust is likely to be generated. Therefore, even in the case of α-winding, it is necessary to create an area on the optical tape and use a method for winding it around the optical head.

従って、従来装置のように、光テープを巻付ける方式で
は反射光がとぎれる領域が生じ、その期間トラック位置
制御と焦点位置制御ができないので光スポットが光テー
プ上に移ったとき光スポットを目標トラック位置へすみ
やかに制御できない。Therefore, when the optical tape is wound around the optical tape as in the conventional device, there is a region where the reflected light is interrupted, and during this period it is impossible to control the track position and focus position. Unable to control position quickly.

〔発明の目的〕[Purpose of the invention]

本発明の目的は、光テープ装置において、光スポットか
つヘッドに巻付けられる光テープのとぎれに領域から次
の走査領域へ移るとき、目標トラックの位置へすみやか
に移すようにする光スポットの制御を提供するものであ
る。SUMMARY OF THE INVENTION An object of the present invention is to control a light spot in an optical tape device so that the light spot is quickly moved to a target track position when moving from an area to the next scanning area at a break in an optical tape wound around a head. This is what we provide.

〔発明の概要〕[Summary of the invention]

光テープがとぎれた領域から次の走査領域へ移るとき光
スポットの目標トラックの位置を予測することで高速な
焦点位置制御とトラック位置制御を行う。トラック位置
制御は、目標トラックの位置へ光スポットが移せるよう
に光スポットを移動できる基準範囲以内にトラック方向
駆動部を設定しておく必要がある。光テープがとぎれた
領域では、走査領域に移ってから始めた目標トラック位
置にくる時点をトリガとしてトラック位置検出部の検出
値をサンプルホールドし、数回にわたるトラック位置検
出部の検出値を平均し基準位置になるように光テープ送
行速度を調整して光スポットを移動できる基準範囲以内
にトラック方向駆動部を設定してトラック位置制御を行
えるようにする。When the optical tape moves from the interrupted area to the next scanning area, high-speed focus position control and track position control are performed by predicting the position of the target track of the optical spot. For track position control, it is necessary to set the track direction drive unit within a reference range within which the light spot can be moved so that the light spot can be moved to the position of the target track. In the area where the optical tape is interrupted, the detected value of the track position detector is sampled and held using the point at which it reaches the target track position that started after moving to the scanning area as a trigger, and the detected values of the track position detector over several times are averaged. To control a track position by adjusting an optical tape feeding speed so as to reach a reference position and setting a track direction drive part within a reference range in which a light spot can be moved.

そして光テープの送行速度変動と光テープのトラック方
向の変位量をそれぞれ検出し、走査領域に移ったときの
目標トラックの位置を予測してトラック位置を制御する
。走査領域では光デイスク装置に用いられているような
反射光を利用した制御を行う。Then, fluctuations in the transport speed of the optical tape and the amount of displacement of the optical tape in the track direction are detected, and the position of the target track when it moves to the scanning area is predicted to control the track position. In the scanning area, control is performed using reflected light, similar to that used in optical disk devices.

焦点位置制御は光テープがとぎれた領域から次の走査領
域へ移るとき焦点位置制御部を設定した位置から大幅に
駆動し、焦点が光テープに合った時点で光デイスク装置
に用いられている同様な制御系に移して高速焦点位置制
御を行う。Focus position control is similar to that used in optical disk devices, when the optical tape moves from the interrupted area to the next scanning area, the focus position control unit is driven significantly from the set position, and when the focus is on the optical tape, it is similar to that used in optical disk devices. The system is then transferred to a new control system to perform high-speed focal position control.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の実施例を図面によって説明する。 Embodiments of the present invention will be described below with reference to the drawings.

第１図は光スポットを制御するための光学式回転ヘッド
系の原理図を示したものである。レーザ発生部１から発
生した光ビームＢ０は、光ビーム分離部３から、水平面
内に回転自在に設けられたガルバノミラ４及び焦点位置
制御用レンズ５により水平面内を回転しながら進んでい
き、固定ドラム２の円周方向に設けられたスリッド部２
ａがらこの部分にいわゆるα巻きされた光テープに照射
され、ここで反射されて上記進路を逆に進み、光ビーム
分離部２で偏向され反射光処理部７に入力される。光ス
ポツト光学系の部分または全体が回転力Ｗｃに回転する
ことで光テープ６上を高速に走査する。この光スポット
は、トラック位置制御手段により、ガルバノミラ４を方
向１３に振ることでトラック方向に移動し、焦点位置制
御手段により焦点位置制御用レンズ５を方向Ａに駆動す
ることで光テープ６上に焦点を結ぶ。前述の反射光処理
部７は、光スポットの位置を制御するトラック位置検出
、焦点位置検出を行ない、それらの信号を前述の制御手
段に加え、処理してガルバノミラ４と焦点位置制御用レ
ンズ５が駆動される。FIG. 1 shows a principle diagram of an optical rotary head system for controlling a light spot. The light beam B0 generated from the laser generating section 1 travels from the light beam separating section 3 while rotating within the horizontal plane through a galvanometer mirror 4 and a focal position control lens 5, which are rotatably provided within the horizontal plane, and then passes through the fixed drum. Slid portion 2 provided in the circumferential direction of 2
The beam a is irradiated onto the so-called α-wound optical tape at this portion, is reflected there, travels in the opposite direction along the above-mentioned path, is deflected by the light beam separation section 2, and is input to the reflected light processing section 7. A portion or the entire optical spot optical system is rotated by the rotational force Wc, thereby scanning the optical tape 6 at high speed. This light spot is moved in the track direction by swinging the galvanometer mirror 4 in the direction 13 by the track position control means, and is moved onto the optical tape 6 by driving the focus position control lens 5 in the direction A by the focus position control means. Connect your focus. The above-mentioned reflected light processing section 7 detects the track position and focus position for controlling the position of the light spot, and applies these signals to the above-mentioned control means and processes them so that the galvano mirror 4 and the focus position control lens 5 Driven.

第２図は焦点位置制御手段とトラック位置制御手段の一
例を説明するブロク図である。先ず、焦点位置制御を説
明し、その後にトラック位置制御を説明する。光スポッ
トのトラック方向の位置は。FIG. 2 is a block diagram illustrating an example of the focus position control means and the track position control means. First, focus position control will be explained, and then track position control will be explained. The position of the light spot in the track direction is.

ガルバノミラ４を駆動することで、移動でき、光スポッ
トの焦点位置に、焦点位置制御用レンズを光軸方向に駆
動することで移動できる。焦点位置制御手段は２つの制
御系８，９を切り換えて制御を行っている。制御系８は
、焦点位置検出部１０から焦点位置ズレ信号を検出し、
その信号を位相補償回路１１とアンプ１２を用いて焦点
位置制御用レンズ駆動部１３の特性に合わせ光スポット
が常に光テープ６上にあるように焦点位置制御用レンズ
５を制御する。制御系９は光テープ６が走査領域に移っ
て目標トラックの位置に焦点を合わせるために設けてあ
り、光テープ有無検出部１４により走査領域と光テープ
６がとぎれる領域を検出し、位相補償回路１５とアンプ
１６を用いて焦点位置制御用レンズ駆動部１３に信号を
加え、焦点位置制御用レンズ５を駆動する。アナログス
イッチ１７は、上記の制御系８，９を切換えるためのも
のであり、この切換え信号を作るためにジャストフォー
カス検出回路１８が設けである。この焦点位置制御は、
まず、光テープ６がとぎれた領域のとき焦点位置制御用
レンズ５を一番端まで引っ込めて待機しておき、次の走
査領域に移ったときに焦点位置制御用レンズ５を別の端
まで高速に駆動することで焦点位置が移動し、光テープ
６上に焦点を合わす。しそしてその時点で制御系を制御
系８に移すことで走査領域での焦点位置制御を行い、光
テープ６がとぎれ主領域では制御系を制御系９に移す、
これにより、再び焦点位置制御用レンズ５は一番端まで
引っ込み待機し同様な動作を繰り返す。It can be moved by driving the galvano mirror 4, and can be moved to the focal position of the light spot by driving the focal position control lens in the optical axis direction. The focus position control means performs control by switching between two control systems 8 and 9. The control system 8 detects a focus position shift signal from the focus position detection unit 10,
Using the phase compensation circuit 11 and the amplifier 12, the signal is adjusted to the characteristics of the focal position controlling lens driving section 13, and the focal position controlling lens 5 is controlled so that the light spot is always on the optical tape 6. The control system 9 is provided to move the optical tape 6 to the scanning area and focus it on the position of the target track.The optical tape presence/absence detection unit 14 detects the area where the optical tape 6 is interrupted from the scanning area, and the phase compensation circuit detects the area where the optical tape 6 is interrupted. 15 and an amplifier 16 to apply a signal to the focal position control lens drive unit 13 to drive the focal position control lens 5. The analog switch 17 is for switching the control systems 8 and 9 described above, and a just focus detection circuit 18 is provided to generate this switching signal. This focus position control is
First, when the optical tape 6 is in an interrupted area, the focal position control lens 5 is retracted to the farthest end and is on standby, and when moving to the next scanning region, the focal position control lens 5 is quickly moved to the other end. The focal position moves by driving the optical tape 6 to focus on the optical tape 6. At that point, the control system is transferred to the control system 8 to control the focus position in the scanning area, and when the optical tape 6 breaks, the control system is transferred to the control system 9 in the main area.
As a result, the focal position control lens 5 is retracted to the farthest end, stands by, and repeats the same operation.

次に、トラック位置制御手段は、２つの制御系１９．２
０からなり、共通の制御系として制御系２１がある。共
通制御系２１はガルバノミラ４の振れが基準角度を中心
に行われるように光テープ６の駆動を行う。ガルバノミ
ラ角度検出部２２とサンプルホールド回路２３で走査領
域に移ってから、はじめに目標トラックに光スポットが
きた時で基準角度θ。になるように光テープ６の送りを
制御する。ただしｎは１以上の整数とする。制御系１９
はトラック位置検出部２７からトラック位置ズレ信号を
検出してその信号を位相補償回路２８とアンプ２９を用
いて制御信号を発生するもので、この信号によりガルバ
ノミラ駆動部３０の特性を合わせ光スポットが目標トラ
ック位置に合うようにガルバノミラ４を制御する。制御
系２０は走査領域に移ったときに、目標トラックの位置
に光スポットを合わせるために設けである。第３図のよ
うに光テープ６の変動量を２、光テープ６の設定速度と
実際の速度の差をＵとして光テープ６のトラック方向り
と光テープ６の送行方向Ｅのなす角度をγとすると、ト
ラック方向りの変位Ｘ。Next, the track position control means includes two control systems 19.2.
0, and there is a control system 21 as a common control system. The common control system 21 drives the optical tape 6 so that the galvanometer mirror 4 swings around the reference angle. The reference angle θ is the first time the light spot reaches the target track after moving to the scanning area by the galvanometer mirror angle detection unit 22 and sample hold circuit 23. The feeding of the optical tape 6 is controlled so that However, n is an integer of 1 or more. Control system 19
The system detects a track position deviation signal from a track position detecting section 27 and uses the signal to generate a control signal using a phase compensation circuit 28 and an amplifier 29. This signal adjusts the characteristics of the galvano-mirror drive section 30 and adjusts the optical spot. The galvanometer mirror 4 is controlled to match the target track position. The control system 20 is provided to align the light spot with the position of the target track when moving to the scanning area. As shown in FIG. 3, the amount of fluctuation of the optical tape 6 is 2, the difference between the set speed and the actual speed of the optical tape 6 is U, and the angle formed by the track direction of the optical tape 6 and the feeding direction E of the optical tape 6 is γ. Then, displacement X in the track direction.

Ｗは時間をｔとするとそれぞれ Ｘ＝Ｚ−ｇｉｎｙ　−（１） Ｗ　＝　Ｕ−ｔ　ｃｏｓγ　・・・（２）で与えられる
。光テープ変動検出部３１は上記の２を、光テープ速度
変動検出部３２は上記のＵ−ｔを検出するものでありア
ンプ３３．３４はそれぞれｇｉｎｙ、　ｇｉｎｙを出力
している。加算回路３５は上記の（１）式と（２）式を
加算し、位相補償回路３６とガルバノミラ角度検出部２
２からの信号と位相補償回路３６からの信号が加わる差
動アンプ３７とアンプ３８を用いて現在のガルバノミラ
４の角度がなす光スポットの位置を計算値と等しくなる
位置に制御を行なう、制御系１９．２０の切り換えはア
ナログスイッチ３９で行っており、焦点位置制御のそれ
ぞれの制御系８，９の切り換えに対応している。W is given by X=Z-giny-(1) W=U-t cosγ (2), respectively, where time is t. The optical tape fluctuation detecting section 31 detects the above 2, the optical tape speed fluctuation detecting section 32 detects the above Ut, and the amplifiers 33 and 34 output giny and giny, respectively. The adder circuit 35 adds the above equations (1) and (2), and adds the above equations (1) and (2) to the phase compensation circuit 36 and the galvano mirror angle detection section 2.
A control system that controls the position of the light spot formed by the current angle of the galvano mirror 4 to a position equal to the calculated value using a differential amplifier 37 and an amplifier 38 to which the signal from 2 and the signal from the phase compensation circuit 36 are added. Switching between 19 and 20 is performed by an analog switch 39, and corresponds to switching between the respective control systems 8 and 9 for focal position control.

第４図は前述の制御系２０における光テープ変動検出部
３１の検出方法に示すものである。光テープ６には溝４
０が書き込まれている。この溝部分に、光テープ変動検
出用の光スポット４１を照射し、±−次光４１ａ、４１
ｂの光量差を検出することで、光テープ６の変動量を検
出する。この場合、溝４０に加えて、光テープ６に反射
率の異なる線状部を設け、これを検出するようにしても
よい。FIG. 4 shows a detection method of the optical tape fluctuation detecting section 31 in the control system 20 described above. The optical tape 6 has a groove 4
0 is written. A light spot 41 for optical tape fluctuation detection is irradiated onto this groove portion, and ±-order light beams 41a, 41
By detecting the difference in light amount b, the amount of variation in the optical tape 6 is detected. In this case, in addition to the grooves 40, the optical tape 6 may be provided with linear portions having different reflectances, and these may be detected.

また、第５図、第６図は共通制御系２１におけるカルバ
ノミラ角度検出部２２０角度検出方法を示すものである
。ガルバノミラ４には光をあてて反射させ、この反射光
４２を第６図に示すように２分割ディテクタ４３に照射
している。ガルバノミラ４に振れ４４があると、反射光
４３は振れ４５が生じる。これにより、第６図に示す２
分割ディテクタ４３は、照射位置の変動による光量差に
対応する信号を発生し、この信号に基づいてガルバノミ
ラ４の角度が検出される。Further, FIGS. 5 and 6 show a method of detecting the angle of the carbanomirror angle detection section 220 in the common control system 21. Light is applied to the galvano mirror 4 and reflected, and the reflected light 42 is irradiated onto a two-split detector 43 as shown in FIG. When the galvano mirror 4 has a deflection 44, the reflected light 43 has a deflection 45. As a result, the 2
The divided detector 43 generates a signal corresponding to a difference in light amount due to a change in the irradiation position, and the angle of the galvano mirror 4 is detected based on this signal.

以上光学式回転ヘッドを構成するドラム２に光テープ６
を角度γで斜めに巻付けた場合を記述したが、角度γが
零や９０度のときは、第２図に示すアンプ３３，３４が
零または１になるので、零の場合はその検出部が省略で
き、■のときはそのアンプが必要ないことは明らかであ
る。The optical tape 6 is attached to the drum 2 that constitutes the optical rotary head.
We have described the case where the is wound diagonally at an angle γ, but when the angle γ is 0 or 90 degrees, the amplifiers 33 and 34 shown in Fig. 2 become 0 or 1. can be omitted, and in the case of ■, it is clear that the amplifier is not required.

また制御系は反射光が戻らない領域がある場合に適用で
きるが光スポットを形成するための対物レンズを２個以
上持ち、対物レンズを切り換えて高速に走査するタイプ
の光ヘッドにも適用できる。Further, the control system can be applied when there is a region where reflected light does not return, but it can also be applied to an optical head of a type that has two or more objective lenses for forming a light spot and scans at high speed by switching the objective lenses.

〔発明の効果〕〔Effect of the invention〕

本発明によれば光スポットの高速なトラック位置制御と
焦点位置制御ができるので、高速な光メモリを得ること
が可能になる効果がある。According to the present invention, it is possible to perform high-speed track position control and focal position control of the optical spot, so that it is possible to obtain a high-speed optical memory.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の光学式回転ヘッド系の概略図、第２図
は本発明における焦点位置制御手段とトラッキング制御
手段の一例を説明するブロック図。 第３図は第２図における光テープ変動検出部の検出法を
説明する図、第４図は第２図における光テープの変動検
出部の検出方法を説明する図、第５図及び第６図は第２
図番；おけるガルバノミラ位置検出部の検出方法を説明
する図で第５図は原理図、第６図は２分割ディテクタを
用いた角度検出器の概略図である。 １・・・レーザ発生器、２・・・ドラム、３・・・光ビ
ーム分離部、４・・・ガルバノミラ、５・・・焦点位置
制御用レンズ、６・・・光テープ、７・・・反射光処理
部、８，９゜１９．２０・・・制御系、１０・・・焦点
位置検出部。 １２．１６，２９，３３，３４，３８・・・アンプ、１
３・・・焦点位置制御用レンズ駆動部、１４・・・光テ
ープ有無検出部、１５，２８，３６・・・位相補償回路
、１７．３９・・・アナログスイッチ、１８・・・ジャ
ストフォーカス検出回路、２１・・・共通制御系、２２
・・・ガルバノミラ角度検出部、２３・・・サンプルホ
ールド回路、２４．３６・・・加算回路、２５・・・平
均回路、２６・・・光テープ駆動部、２７・・・トラッ
ク位置検出部、３０・・・ガルバノミラ駆動部、３１・
・・光テープ変動検出部、３２・・・光テープ速度変動
検出部、３７・・・差動アンプ、４０・・・溝、４１・
・・光スポット、４２・・・反射光、４３・・・２分割
ディテクタ。 第１　■ 才２　図 矛３　圀 し 才　４−目 １ｂ 才り凹FIG. 1 is a schematic diagram of an optical rotary head system according to the present invention, and FIG. 2 is a block diagram illustrating an example of a focal position control means and a tracking control means according to the present invention. FIG. 3 is a diagram explaining the detection method of the optical tape variation detection section in FIG. 2, FIG. 4 is a diagram explaining the detection method of the optical tape variation detection section in FIG. 2, and FIGS. 5 and 6 is the second
FIG. 5 is a principle diagram, and FIG. 6 is a schematic diagram of an angle detector using a two-split detector. DESCRIPTION OF SYMBOLS 1... Laser generator, 2... Drum, 3... Light beam separation part, 4... Galvano mirror, 5... Focus position control lens, 6... Optical tape, 7... Reflected light processing unit, 8,9°19.20... Control system, 10... Focus position detection unit. 12.16,29,33,34,38...Amplifier, 1
3... Lens drive unit for focal position control, 14... Optical tape presence/absence detection unit, 15, 28, 36... Phase compensation circuit, 17.39... Analog switch, 18... Just focus detection Circuit, 21... Common control system, 22
... Galvano mirror angle detection unit, 23... Sample hold circuit, 24.36... Addition circuit, 25... Average circuit, 26... Optical tape drive unit, 27... Track position detection unit, 30... Galvano mirror drive unit, 31...
... Optical tape variation detection section, 32... Optical tape speed variation detection section, 37... Differential amplifier, 40... Groove, 41.
...Light spot, 42...Reflected light, 43...2-split detector. 1st ■ Sai 2 Zuho 3 Kunishi Sai 4-me 1b Sairi concave

Claims (1)

【特許請求の範囲】 １、光スポットを形成し媒体の情報を読みまたは書く光
テープ装置において、光スポットをトラック方向に移動
するためのトラック方向駆動部と、反射光を用いてトラ
ック位置のズレ量を検出するトラック検出部と、トラッ
ク方向駆動部の位置または角度を検出するためのトラッ
ク位置検出部と、目標トラック・に光スポットを移動す
るためのトラック位置制御手段と、光スポットの走査領
域に媒体の有無を検出するための媒体有無検出部と、媒
体上に焦点を結ぶための焦点位置制御手段と、媒体の焦
点ズレ量を検出する焦点検出部と、媒体の変動量を検出
するための媒体変動検出部と、媒体の変動量を検出する
ための媒体変動検出部と、媒体の移動速度を検出するた
めの媒体速度変動検出部を設けたことを特徴とする光テ
ープ装置における光スポツト制御装置。 ２、光スポットのトラック位置制御手段と焦点位置制御
手段を切換え手段により切換えて制御することを特徴と
する特許請求の範囲第１項記載の光テープ装置における
光スポツト制御装置。 ３、光スポットのトラック方向と媒体の移動方向の角度
をγとし、媒体速度変動検出部の出力をＵ−ｔとし、媒
体変動検出部の出力をＺとした場合、Ｕ　ｔ−ｃｏｓγ
＋Ｚ　ｇｉｎγ　の計算値だけトラック方向駆動部を移
動するように制御する期間を設けたことを特徴とする特
許請求の範囲第１項または第２項記載の光テープ装置に
おける光スポツト制御装置。 ４、媒体変動検出部は光ディテクタを用いて物体に書き
込んである溝または反射率の異なる線状の区域を検出す
ることにより媒体の変動量を検出するように構成したこ
とを特徴とする特許請求の範囲第１項〜第２項のいずれ
か１項に記載の光テープ装置における光スポツト制御装
置。 ５、光スポットをトラック方向に移動する手段としてガ
ルバノミラを用い、トラック位置検出部に２分割の光デ
ィテクタを用いたことを特徴とする特許請求の範囲第１
項〜第４項のいずれか１項に記載の光テープ装置の光ス
ポツト制御装置。[Claims] 1. In an optical tape device that forms a light spot and reads or writes information on a medium, there is provided a track direction drive unit for moving the light spot in the track direction, and a track position shifter using reflected light. a track detection section for detecting the amount, a track position detection section for detecting the position or angle of the track direction drive section, a track position control means for moving the light spot to the target track, and a scanning area of the light spot. a medium presence/absence detection section for detecting the presence or absence of a medium, a focus position control means for focusing on the medium, a focus detection section for detecting the amount of defocus of the medium, and a focus detection section for detecting the amount of fluctuation of the medium. An optical spot in an optical tape device, characterized in that a medium fluctuation detection section is provided, a medium fluctuation detection section for detecting the amount of fluctuation of the medium, and a medium speed fluctuation detection section for detecting the moving speed of the medium. Control device. 2. A light spot control device in an optical tape device according to claim 1, wherein the track position control means and the focal point position control means of the light spot are switched and controlled by a switching means. 3. If the angle between the track direction of the light spot and the moving direction of the medium is γ, the output of the medium speed fluctuation detection section is U-t, and the output of the medium fluctuation detection section is Z, then U t-cos γ
3. The optical spot control device for an optical tape device according to claim 1, further comprising a period for controlling the track direction drive unit to move by the calculated value of +Z ginγ. 4. A patent claim characterized in that the medium variation detection unit is configured to detect the amount of variation in the medium by detecting grooves written on the object or linear areas with different reflectances using an optical detector. An optical spot control device in an optical tape device according to any one of items 1 to 2. 5. Claim 1, characterized in that a galvano mirror is used as means for moving the light spot in the track direction, and a two-divided optical detector is used as the track position detection section.
An optical spot control device for an optical tape device according to any one of items 1 to 4.
JP24397983A 1983-12-26 1983-12-26 Optical spot controller in optical tape device Pending JPS60136927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24397983A JPS60136927A (en) 1983-12-26 1983-12-26 Optical spot controller in optical tape device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24397983A JPS60136927A (en) 1983-12-26 1983-12-26 Optical spot controller in optical tape device

Publications (1)

Publication Number Publication Date
JPS60136927A true JPS60136927A (en) 1985-07-20

Family

ID=17111893

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24397983A Pending JPS60136927A (en) 1983-12-26 1983-12-26 Optical spot controller in optical tape device

Country Status (1)

Country Link
JP (1) JPS60136927A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01311433A (en) * 1988-06-10 1989-12-15 Hitachi Ltd Optical tape device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01311433A (en) * 1988-06-10 1989-12-15 Hitachi Ltd Optical tape device

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