JPH0452531B2 - - Google Patents
Info
- Publication number
- JPH0452531B2 JPH0452531B2 JP58105876A JP10587683A JPH0452531B2 JP H0452531 B2 JPH0452531 B2 JP H0452531B2 JP 58105876 A JP58105876 A JP 58105876A JP 10587683 A JP10587683 A JP 10587683A JP H0452531 B2 JPH0452531 B2 JP H0452531B2
- Authority
- JP
- Japan
- Prior art keywords
- optical component
- disk
- tracking servo
- objective lens
- servo 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.)
- Expired - Lifetime
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
- G11B7/0901—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 track following only
Landscapes
- Moving Of The Head To Find And Align With The Track (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は、光学式情報読取り装置に係り、更に
詳しくは良好なな飛び越し再生などを行なうため
に、好適なトラツキングサーボループの引込み動
作を行なうトラツキングサーボ引込み装置に関す
るものである。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an optical information reading device, and more specifically, to perform a suitable retracting operation of a tracking servo loop in order to perform good interlaced playback. This invention relates to a tracking servo retraction device.
第１図は光学式情報読取り装置の概略を示す斜
視図である。第１図において、１はデイスク、２
は対物レンズ駆動装置、３は対物レンズ、４と５
はそれぞれ対物レンズ支持持バネ、６はコイル、
７と８はそれぞれ磁気ヨーク、９は収束光、１０
はマグネツト、を示す。
FIG. 1 is a perspective view schematically showing an optical information reading device. In Figure 1, 1 is a disk, 2
is the objective lens drive device, 3 is the objective lens, 4 and 5
are objective lens support springs, 6 is a coil,
7 and 8 are respectively magnetic yokes, 9 is a convergent light, and 10
indicates magnet.
次に動作を説明する。情報記録媒体であるデイ
スク１の上の情報記録トラツクに収束光９を照射
し、その反射光による情報を対物レンズ３を介し
て読取り再生を行なうわけであるが、その収束光
９を前記情報記録トラツクに正確に集光させるた
めに、対物レンズ駆動装置２が用いられる。対物
レンズ駆動装置２においては、対物レンズ３が対
物レンズ支持バネ４，５で支持され、該支持バネ
４，５はマグネツト１０、磁気ヨーク７，８から
成る磁気回路とコイル６に流れる電流により発す
る電磁力によつて、光軸方向（Ｚ方向）、トラツ
キング方向（Ｘ方向）、或いはタンゼンシヤル方
向（Ｙ方向）に、それぞれ図示せざる手段によつ
て検出された各誤差信号が零になるように駆動さ
れ、対物レンズ３を介して照射する収束光９の照
射方向を正確に制御する。 Next, the operation will be explained. Convergent light 9 is irradiated onto the information recording track on the disk 1, which is an information recording medium, and information from the reflected light is read and reproduced through the objective lens 3. In order to focus the light accurately onto the track, an objective lens drive 2 is used. In the objective lens driving device 2, an objective lens 3 is supported by objective lens support springs 4 and 5, which generate electric current flowing through a magnetic circuit consisting of a magnet 10, magnetic yokes 7 and 8, and a coil 6. By electromagnetic force, each error signal detected by means not shown in the optical axis direction (Z direction), tracking direction (X direction), or tangential direction (Y direction) becomes zero. The irradiation direction of the convergent light 9 that is driven and irradiated through the objective lens 3 is accurately controlled.
ところで、特殊再生の一つである飛び越し再生
をデイスク１の内周から外周側に向けて行なう場
合には、スライド機構（図では示していない）で
三次元駆動装置２をＡ方向に一定の高速度で送り
続け、同時にトラツキングサーボループを一定周
期で開閉し、デイスク１からの情報を断続的に読
みとつている。それでトラツキングサーボループ
が閉じている（デイスク１から情報を読み取る）
間には、対物レンズ３は三次元駆動装置２の中心
軸よりもデイスク１の内周側に位置している。そ
してトラツキングサーボループを開くと、サーボ
制御機構から解き放された対物レンズ３は自由振
動をはじめる。それを図に示したのが第２図であ
る。 By the way, when performing interlaced playback, which is a type of special playback, from the inner circumference to the outer circumference of the disc 1, the three-dimensional drive device 2 is moved to a certain height in the A direction using a slide mechanism (not shown). The data continues to be fed at a high speed, and at the same time, the tracking servo loop is opened and closed at regular intervals, and information from disk 1 is read intermittently. So the tracking servo loop is closed (reads information from disk 1)
In between, the objective lens 3 is located closer to the inner circumference of the disk 1 than the central axis of the three-dimensional drive device 2. When the tracking servo loop is opened, the objective lens 3 released from the servo control mechanism begins to vibrate freely. This is illustrated in Figure 2.
第２図は対物レンズ３の位置変化を示したグラ
フであり、横軸は時間、縦軸は対物レンズ駆動装
置２における中心軸からの位置変位を示してい
る。該自由振動における制動係数ζが小さい場
合、対物レンズ３の運動は振幅が大で、減衰の少
ない単振動となる。 FIG. 2 is a graph showing changes in the position of the objective lens 3, where the horizontal axis shows time and the vertical axis shows the positional displacement from the central axis of the objective lens driving device 2. When the damping coefficient ζ in the free vibration is small, the motion of the objective lens 3 has a large amplitude and becomes a simple harmonic motion with little damping.
次に、トラツキングサーボループを閉じてトラ
ツキングサーボループの引き込みを行なうわけで
あるが、そのとき、トラツキングサーボループの
引き込みを容易に行なうことができる時点は、デ
イスク１に対する対物レンズ３の相対速度が小さ
くなる時点である。つまり第２図中においいて具
体的に示すとP1，P2，P3点の近傍である。とこ
ろで従来の方式では、例えばP1の時点でトラツ
キングサーボ引き込みが行われ、その動作中にた
たまたま外乱が該サーボ系に入つた場合、外乱に
よる影響で対物レンズ３が並進移動せず、仰りが
生じてトラツキングサーボ引き込みに失販するこ
とがあつた。しかも該時点での引込みに失販する
と次に引込みを容易に行なうことができる時点は
P2であり、P2が致来するまでの間つまり単振動
周期Ｔの1/22の時間、デイスク１からの情報読み
取りが不能となつてしまう。すなわち、従来の方
式では制動係数ζが小さい場合は外乱による影響
を受け易く、特に三次元駆動装置など、対物レン
ズの仰り位置制御が困難な場合、トラツキングサ
ーボループの引き込みを失販するケースが多く、
そのためビデイオデイスクプレーヤ等において、
飛び越し再生時に、画出しピツチが不規則となり
画乱れ現象の原因ともなつていた。 Next, the tracking servo loop is closed and the tracking servo loop is retracted. At this time, the point at which the tracking servo loop can be easily retracted is determined by the relative position of the objective lens 3 with respect to the disk 1. This is the point at which the speed decreases. That is, specifically shown in FIG. 2, it is in the vicinity of three points P 1 , P 2 , and P . In the conventional method, for example, when the tracking servo is pulled in at point P 1 , and a disturbance happens to enter the servo system during that operation, the objective lens 3 does not move in translation due to the influence of the disturbance, and the tracking servo pulls in. This caused sales to be lost due to tracking servo retraction. Moreover, if you lose sales at that point, the next point when you can easily pull in will be
P 2 , and it becomes impossible to read information from disk 1 until P 2 arrives, that is, for a time of 1/22 of the simple harmonic period T. In other words, in the conventional method, when the damping coefficient ζ is small, it is easily affected by external disturbances, and especially in cases where it is difficult to control the upward position of the objective lens, such as in a three-dimensional drive device, there are cases where the retraction of the tracking servo loop is lost. many,
Therefore, in video disc players, etc.
During interlaced playback, the image output pitch became irregular, which caused image distortion.
本発明は前述のような従来方式の欠点を除去す
るためになされたものであり、従つて本発明の目
的は、トラツキングサーボループの引込み動作の
失敗をなくして、良好な特殊再生の実現に役立つ
トラツキングサーボ引込装置を提供することにあ
る。
The present invention has been made in order to eliminate the drawbacks of the conventional method as described above, and therefore, an object of the present invention is to eliminate the failure of the tracking servo loop pull-in operation and realize good special playback. An object of the present invention is to provide a useful tracking servo retraction device.
本発明は上記目的を達成するために、前記単振
動を行なつている光学部品が、光学部品駆動装置
で停止すべく、単振動を阻止する方向に電磁力を
一定期間加え、前記光学部品の運動における見か
けの制動係数ζを増した。
In order to achieve the above object, the present invention applies an electromagnetic force for a certain period of time in the direction of preventing the simple harmonic motion, so that the optical component that is performing the simple harmonic motion is stopped by an optical component driving device. Increased the apparent damping coefficient ζ in motion.
以下本発明の一実施例として、本発明を特殊再
生の一つである飛び越し再生に適用した場合につ
いて説明する。なお、第３図ａは本発明の実施例
における対物レンズ３の位置変化を示したグラフ
で、横軸に時間、縦軸に対物レンズ駆動装置２に
おける中心軸からの位置変位を示す。第３図ｂは
本発明の実施例における前記対物レンズ３に印加
する電磁力の時間的タイミングの一例を示したグ
ラフで、横軸に時間、縦軸に印加した電磁力を示
す。
As an embodiment of the present invention, a case will be described below in which the present invention is applied to interlace playback, which is one type of special playback. Note that FIG. 3a is a graph showing changes in the position of the objective lens 3 in the embodiment of the present invention, where the horizontal axis shows time and the vertical axis shows the positional displacement from the central axis of the objective lens driving device 2. FIG. 3b is a graph showing an example of the temporal timing of the electromagnetic force applied to the objective lens 3 in the embodiment of the present invention, where the horizontal axis shows time and the vertical axis shows the applied electromagnetic force.
第１図を参照する。前述の如く、飛び越し再生
は、対物レンズ駆動装置２を一定の高速度でスラ
イド機構（図には示されていない）によつてＡの
方向に送り、トラツキングサーボループを開閉
し、デイスク１からの情報を断続的に読み取る。 Please refer to FIG. As mentioned above, in interlaced playback, the objective lens driving device 2 is sent in the direction A at a constant high speed by a slide mechanism (not shown), the tracking servo loop is opened and closed, and the tracking servo loop is opened and closed. The information is read intermittently.
第３図を参照する。今、トラツキングサーボル
ープを開いて、対物レンズ３が制御機構から解放
された時点から単振動周期Ｔの1/8乃至1/4の時間
が経過した時刻をT1とする。次に時刻T1から
Ｔ／４未満の期間（t′）、単振動を阻止する方向
に一定の電磁力を作用させる。そのときの対物レ
ンズ３の位置変化は第３図ａに示す如く表わされ
る。 See Figure 3. Now, the tracking servo loop is opened and the time when 1/8 to 1/4 of the simple harmonic period T has elapsed from the time when the objective lens 3 is released from the control mechanism is defined as T1 . Next, for a period (t') less than T/4 from time T1 , a constant electromagnetic force is applied in a direction to prevent simple harmonic motion. The positional change of the objective lens 3 at that time is expressed as shown in FIG. 3a.
第３図ａは第２図と比して明らかに振幅が小さ
くなるので、最大速度も小さくなり、かつポテン
シヤルエネルギの小さい最も安定な駆動装置の中
心軸付近に対物レンズ３が常に存在するのでトラ
ツキングサーボループを引き込むチヤンスは急増
することになる。よつてデイスクからの情報読み
取りは、Ｔ／４の周期で確実に行なうことができ
る。 In Fig. 3a, the amplitude is clearly smaller than in Fig. 2, so the maximum speed is also smaller, and the objective lens 3 is always located near the center axis of the most stable drive device with the smallest potential energy, so it is troublesome. The chances of engaging the king servo loop will increase rapidly. Therefore, information can be reliably read from the disk at a cycle of T/4.
本発明によれば、光学式情報読取装置におい
て、特殊再生時どにトラツキングサーボループの
引込みに失敗することがなくなり、デイスク１か
らの情報の読取りは確実に行なうことが可能とな
る。またた光学部品駆動装置において、該光学部
品の挙動ひいては収束光に対する制動係数ζが小
さい場合でも、見かけのζを上げることができる
ので光学系部品を支持する材料選択に大きな自由
度を与えることができる。特に支持材に経時変化
の少ない金属バネを用いることが可能となり、駆
動装置の信頼性も向上する。さらに、前記実施例
では、収束光９の照射位置をトラツキング方向に
移動せしめる光学部品として、対物レンズ３を用
いたが、反射ミラー等を用いても同様の効果を得
ることができる。
According to the present invention, in the optical information reading device, there is no possibility that the tracking servo loop fails to pull in during special playback, and information can be reliably read from the disk 1. In addition, in an optical component driving device, even if the behavior of the optical component and the damping coefficient ζ for convergent light are small, the apparent ζ can be increased, giving greater freedom in selecting materials to support the optical system components. can. In particular, it becomes possible to use a metal spring with little change over time for the support material, and the reliability of the drive device is also improved. Furthermore, in the embodiment described above, the objective lens 3 was used as an optical component for moving the irradiation position of the convergent light 9 in the tracking direction, but the same effect can be obtained by using a reflecting mirror or the like.
第１図は光学式読取り装置の概略を示す斜視
図、第２図は従来の装置における光学部品（対物
レンズ３）の位置変化を示すグラフ、第３図ａは
本発明の実施例における光学部品のそれを示すグ
ラフ、第３図ｂは本発明によつて光学部品に印加
する電磁力の時間的タイミングの一例を示すグラ
フである。
符号の説明、１……デイスク、２……対物レン
ズ駆動装置、３……対物レンズ、４，５……対物
レンズ支持バネ、６……コイル、７，８……磁気
ヨーク、９……収束光、１０……マグネツト。
FIG. 1 is a perspective view schematically showing an optical reading device, FIG. 2 is a graph showing changes in the position of an optical component (objective lens 3) in a conventional device, and FIG. 3a is an optical component in an embodiment of the present invention. FIG. 3b is a graph showing an example of the temporal timing of the electromagnetic force applied to the optical component according to the present invention. Explanation of symbols, 1...Disk, 2...Objective lens drive device, 3...Objective lens, 4, 5...Objective lens support spring, 6...Coil, 7, 8...Magnetic yoke, 9...Convergence Light, 10... Magnet.
Claims (1)
上の情報記録トラツクに対し収束光を照射し情報
を読取再生するための光学部品と、該光学部品を
弾性的に支持する弾性的支持手段を、前記収束光
が前記トラツクを正確にトラツキングするように
駆動するトラツキングサーボ装置と、光学部品を
支持した前記支持手段およびトラツキングサーボ
装置を搭載し、これらを前記デイスクに対して相
対的に移動させるための駆動装置とを有して成る
光学式情報読取装置において、飛び越し再生など
のため、前記サーボ装置をオン、オフさせながら
前記駆動装置によつて前記光学部品およびサーボ
装置を前記デイスクに対して相対移動させる際、
サーボ装置がオンからオフに転じたことにより駆
動解除された前記弾性的支持手段によつて自由振
動を開始した光学部品に対し、その振動周期Ｔの
１／８乃至1/4時間経過後に、該自由振動を阻止する
向きに1/4Ｔ未満の期間だけ外力を印加する手段
を設け、該外力の印加後に前記サーボ装置をオフ
からオンに戻すようにしたことを特徴とするトラ
ツキングサーボ引き込み装置。1. A disk as an information recording medium, an optical component for reading and reproducing information by irradiating an information recording track on the disk with convergent light, and an elastic support means for elastically supporting the optical component, as described above. A tracking servo device that drives the convergent light to accurately track the track, the support means supporting the optical component, and the tracking servo device are mounted, and the tracking servo device is moved relative to the disk. In the optical information reading device, the optical component and the servo device are moved relative to the disk by the drive device while turning the servo device on and off for interlaced playback or the like. When moving,
After 1/8 to 1/4 hour of the vibration period T has elapsed for the optical component that has started free vibration due to the elastic support means being deactivated due to the servo device turning from on to off, A tracking servo retracting device characterized in that means is provided for applying an external force for a period of less than 1/4T in a direction to prevent free vibration, and the servo device is turned back on from off after application of the external force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10587683A JPS60624A (en) | 1983-06-15 | 1983-06-15 | Tracking servo locking device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10587683A JPS60624A (en) | 1983-06-15 | 1983-06-15 | Tracking servo locking device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60624A JPS60624A (en) | 1985-01-05 |
| JPH0452531B2 true JPH0452531B2 (en) | 1992-08-24 |
Family
ID=14419138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10587683A Granted JPS60624A (en) | 1983-06-15 | 1983-06-15 | Tracking servo locking device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60624A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2305520A1 (en) | 2009-09-30 | 2011-04-06 | Honda Motor Co., Ltd. | Airbag device for saddle-ride type vehicle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5348155A (en) * | 1991-05-28 | 1994-09-20 | Ringston Co., Ltd. | Plastic film bag with an inflated pattern |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5626802A (en) * | 1979-08-14 | 1981-03-16 | Akira Motono | Fumigant preparation |
| JPS56124168A (en) * | 1980-03-04 | 1981-09-29 | Matsushita Electric Ind Co Ltd | Device for reproducing information |
-
1983
- 1983-06-15 JP JP10587683A patent/JPS60624A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2305520A1 (en) | 2009-09-30 | 2011-04-06 | Honda Motor Co., Ltd. | Airbag device for saddle-ride type vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60624A (en) | 1985-01-05 |
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