JPH02193325A - Actuator for multi-beam optical head - Google Patents
Actuator for multi-beam optical headInfo
- Publication number
- JPH02193325A JPH02193325A JP1190589A JP1190589A JPH02193325A JP H02193325 A JPH02193325 A JP H02193325A JP 1190589 A JP1190589 A JP 1190589A JP 1190589 A JP1190589 A JP 1190589A JP H02193325 A JPH02193325 A JP H02193325A
- Authority
- JP
- Japan
- Prior art keywords
- prism
- image rotation
- medium
- rotation prism
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 33
- 238000010586 diagram Methods 0.000 description 8
- 239000010410 layer Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
光ディスク、光カード、および光テープ用のマルチ・ビ
ーム光ヘッドのアクチュエータに関し、複数の光ビーム
のトラッキングを容易に行なうことを目的とし、
像回転ブリズトの一辺を支点とし、電磁気力により回転
駆動される光学系を有し、該像回転プリズムに複数の光
ビームを通し、該光ビームが結ぶ媒体上のスポット位置
を該像回転プリズムを回動して調整しトラッキングを行
なうように構成する。[Detailed Description of the Invention] [Summary] This invention relates to an actuator for a multi-beam optical head for optical disks, optical cards, and optical tapes, and is intended to facilitate tracking of multiple light beams. It has an optical system that is rotationally driven by electromagnetic force with the image rotation prism as a fulcrum, and a plurality of light beams are passed through the image rotation prism, and the spot position on the medium that the light beams connect is adjusted by rotating the image rotation prism. and configure it to perform tracking.
本発明は光ディスク、光カード、および光テープ用のマ
ルチ・ビーム光ヘッドのアクチュエータに関する。The present invention relates to actuators for multi-beam optical heads for optical disks, optical cards, and optical tapes.
光デイスク装置は、その特徴である大容量性、可換性、
高信頼性によりイメージデータファイルから電子計算装
置の外部記憶装置まで応用分野の拡大が見込まれている
。Optical disk devices are characterized by their large capacity, interchangeability,
Due to its high reliability, the field of application is expected to expand from image data files to external storage devices for electronic computing devices.
この光デイスク装置は、第４図に示すように透明基板１
、反射層２、保護層３からなる３層構造の光ディスク４
を用い、信号は反射層２の反射面にビットと呼ばれる溝
５の長さと間隔により情報が記録され、信号の取出しは
、光へラド６を用いる。光ヘッド６は、半導体レーデ７
から出射したＰ偏光８をレンズ９により整形して平行光
となし、偏光ビームスプリッタ１０、区波長板１１を通
して円偏光とし、対物レンズ１２により集光して光ディ
スク４に入射する。反射光は逆の円偏光となり、ス波長
板１１を通ることによりＳ偏光となって偏光ビームスプ
リッタ１０により反射されて光検出器１３に入り光信号
が電気信号に変換されて情報が取り出されるようになっ
ている。This optical disk device has a transparent substrate 1 as shown in FIG.
, a reflective layer 2, and a protective layer 3.
Information is recorded on the reflective surface of the reflective layer 2 by the length and spacing of grooves 5 called bits, and an optical disc 6 is used to extract the signal. The optical head 6 is a semiconductor radar 7.
The P-polarized light 8 emitted from the P-polarized light 8 is shaped by a lens 9 to become parallel light, passed through a polarizing beam splitter 10 and a wavelength plate 11 to become circularly polarized light, and condensed by an objective lens 12 to enter the optical disk 4 . The reflected light becomes reverse circularly polarized light, passes through the wavelength plate 11, becomes S-polarized light, is reflected by the polarizing beam splitter 10, and enters the photodetector 13, where the optical signal is converted into an electrical signal and information is extracted. It has become.
このような光デイスク装置において、消去と書き込みを
同時に行うような場合には、２つのビームを用い光ディ
スクのトラック上を先行するビームで消去を行い、後ろ
のビームで書き込みを行うことができるように光源とし
てレーザ・ダイオード・アレイを用い、１つの対物レン
ズから複数の光ビームを出射するマルチ・ビーム光ヘッ
ドが用いられる。In such an optical disk device, when erasing and writing are to be performed at the same time, two beams are used so that the leading beam can perform erasing on the track of the optical disc, and the rear beam can perform writing. A multi-beam optical head is used that uses a laser diode array as a light source and emits a plurality of light beams from one objective lens.
上記従来のレーデ・ダイオード・アレイを用いた光ヘッ
ドでは、システムへのヘッド取り付は時に各ビームのア
レイ方向と光デイスク上のトラックを平行とするのみで
その後、この平行度を維持するためのトラッキングを行
なう機構は持っていない。このためトラックが偏心して
いたり、第５図に示すように楕円状になっている場合に
は、ビームのアレイ方向りとディスク上のトラックの方
向Ｔが平行でなくなるときがあり、書き込みおよび読み
出しくオーバライド）ができないという問題が生じてい
た。In the optical head using the conventional Rade diode array mentioned above, sometimes the head is installed in the system simply by making the array direction of each beam parallel to the track on the optical disk. It does not have a tracking mechanism. Therefore, if the track is eccentric or has an elliptical shape as shown in Figure 5, the direction of the beam array and the direction T of the track on the disk may not be parallel, making writing and reading difficult. There was a problem that it was not possible to override.
本発明は上記従来の問題点に鑑み、複数の光ビームのト
ラッキングを容易に行うことができるマルチ・ビーム光
ヘッド用アクチュエータを提供することを目的とする。SUMMARY OF THE INVENTION In view of the above conventional problems, it is an object of the present invention to provide an actuator for a multi-beam optical head that can easily track a plurality of light beams.
上記目的を解決するために、本発明の光ヘッドは、像回
転プリズム２０の一辺を、２点とし、電磁気力により回
転駆動される光学系を有し、該像回転プリズム２０に複
数の光ビームを通し、該光ビームが結ぶ媒体３１上のス
ポット位置を該像回転プリズム２０を回動して調整しト
ラッキングを行うことを特徴とする。In order to solve the above object, the optical head of the present invention has an optical system that has two points on one side of the image rotation prism 20 and is rotationally driven by electromagnetic force, and has a plurality of light beams on the image rotation prism 20. The feature is that tracking is performed by rotating the image rotating prism 20 to adjust the spot position on the medium 31 that the light beam focuses on.
一直線に並んだ複数の光ビームを像回転プリズム２０を
通し、該像回転プリズム２０を回動すればビームアレイ
の方向を調節することができ、媒体上のトラックが偏心
していたり円でなく楕円状になっていても、ビームのア
レイ方向と媒体上のトラックの方向をつねに平行に維持
することができる。By passing a plurality of light beams lined up in a straight line through an image rotation prism 20 and rotating the image rotation prism 20, the direction of the beam array can be adjusted. Even if the beam array direction and the track direction on the medium are parallel to each other, the beam array direction and the track direction on the medium can always be kept parallel.
第１図は本発明の実施例を示す図であり、（ａ）は斜視
図、（ｂ）はａ図のｂ−ｂ線における断面図である。FIG. 1 is a diagram showing an embodiment of the present invention, in which (a) is a perspective view, and (b) is a sectional view taken along the line bb in FIG.
同図において、２０は像回転プリズム（ダブプリズム）
であり、棒状体の両端面を斜面としたプリズムである。In the same figure, 20 is an image rotation prism (Dove prism)
It is a prism with both end faces of a rod-shaped body being sloped.
２１はその長手方向の側面に設けられた軸受で、軸２２
が挿通され、該軸２２で像回転プリズム２０を回動自在
に支持している。また像回転プリズム２０の軸受が設け
られた面の反対面には永久磁石２３が取付けられていて
、該永久磁石２３の両極にそれぞれ近接して設けられた
コイル２４．２４’によって像回転プリズム２０を回動
駆動することができるようになっている。21 is a bearing provided on the side surface in the longitudinal direction, and the shaft 22
is inserted through the shaft 22, and the image rotation prism 20 is rotatably supported by the shaft 22. Further, a permanent magnet 23 is attached to the opposite surface of the image rotating prism 20 to the surface on which the bearing is provided, and coils 24 and 24' provided close to both poles of the permanent magnet 23 are used to rotate the image rotating prism 20. can be rotated.
このように構成された本実施例のアクチュエータは第２
図に示すようにマルチ・ビーム光ヘッドに用いられる。The actuator of this embodiment configured in this way has a second
As shown in the figure, it is used in a multi-beam optical head.
同図において２５はレーザ光源、２６は集光レンズ、２
７は光源からの楕円ビームを真円に整形するビーム整形
プリズム、２８．２９は偏光ビームスプリフタ、３０は
対物レンズ、３１は記録媒体、３２はス波長板、３３．
３４は集光レンズ、３５．３６はディテクタであり、該
ディテクタ３５．３６とでトラック信号及び情報信号を
出力するようになっている。本実施例のアクチユエータ
はビーム整形プリズム２７と偏光ビームスプリッタ２８
との光路中に挿入配置され、ディテクタ３５．３６から
のトラック信号により増幅器３７及び電源３８を介して
回動制御されるようになっている。In the figure, 25 is a laser light source, 26 is a condensing lens, 2
7 is a beam shaping prism that shapes the elliptical beam from the light source into a perfect circle, 28.29 is a polarizing beam splitter, 30 is an objective lens, 31 is a recording medium, 32 is a wavelength plate, 33.
34 is a condensing lens, and 35 and 36 are detectors, which together with the detectors 35 and 36 output track signals and information signals. The actuator of this embodiment includes a beam shaping prism 27 and a polarizing beam splitter 28.
It is inserted into the optical path of the detector 35 and 36, and its rotation is controlled via an amplifier 37 and a power supply 38 by track signals from detectors 35 and 36.
第３図は本実施例の作用を説明するための図である。FIG. 3 is a diagram for explaining the operation of this embodiment.
図により説明すると、レーザ光源２５から出射したレー
ビームアレイＰ＋−Ｐａは像回転プリズム２０が図の位
置にあるときは、該像回転プリズム２０を通りＱａ−Ｑ
４に出射する。このとき像回転プリズム２０をΔデだけ
回動するとＱｔ ”ＱａはＱｌ 〜Ｑ４ ’に移動し
、その線Ｑは２Δ！だけ回転することになる。To explain with a diagram, when the image rotation prism 20 is in the position shown in the figure, the laser beam array P+-Pa emitted from the laser light source 25 passes through the image rotation prism 20 and Qa-Q.
It emits at 4. At this time, when the image rotating prism 20 is rotated by Δd, Qt"Qa moves from Ql to Q4', and the line Q is rotated by 2Δ!.
これにより第２図で示す如きマルチ・ビーム光ヘッドに
おいて、２個のビームの中心が１００Ｊ−離れている場
合、一方のビームを記録媒体上の一点に固定し、像回転
プリズム２０を０．２°回動すると他方のビームの中心
が０．３５７−移動する。このように像回転プリズム２
０を回動することによりビームアレイの方向を媒体のト
ラック方向に合わせることができる。なおこの場合、ビ
ームの移動に伴うディテクタの出力の変動はほとんど問
題にならない。As a result, in a multi-beam optical head as shown in FIG. 2, when the centers of two beams are separated by 100 J, one beam is fixed at one point on the recording medium and the image rotation prism 20 is When rotated by 0.3 degrees, the center of the other beam moves by 0.357. In this way, the image rotation prism 2
By rotating 0, the direction of the beam array can be aligned with the track direction of the medium. Note that in this case, fluctuations in the output of the detector due to the movement of the beam hardly matter.
以上説明した様に、本発明によれば、トラックが偏心し
ていたり円ではなく楕円状になっている場合にも、ビー
ムのアレイ方向と媒体上のトラックの方向を一致させる
ことができるため、精度よく書き込みおよび読み出しく
オーバライド）ができる。As explained above, according to the present invention, even when the track is eccentric or has an elliptical shape instead of a circle, the beam array direction and the track direction on the medium can be made to match, so that accuracy can be improved. Can be easily written and read (overridden).
第１図は本発明の実施例を示す図。
第２図は本発明の実施例を用いたマルチ・ビーム光ヘッ
ドを示す図。
第３図は本発明の実施例の作用を説明するための図。
第４図は従来の光デイスク装置を示す図。
第５図は発明が解決しようとする課題を説明するための
図である。
図において、
２０は像回転プリズム、
２１は軸受、
２２は軸、
２３は永久磁石、
２４．２４’ はコイル
を示す。FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing a multi-beam optical head using an embodiment of the present invention. FIG. 3 is a diagram for explaining the operation of the embodiment of the present invention. FIG. 4 is a diagram showing a conventional optical disk device. FIG. 5 is a diagram for explaining the problem to be solved by the invention. In the figure, 20 is an image rotating prism, 21 is a bearing, 22 is a shaft, 23 is a permanent magnet, and 24.24' is a coil.
Claims (1)
力により回転駆動される光学系を有し、該像回転プリズ
ム（２０）に複数の光ビームを通し、該光ビームが結ぶ
媒体（３１）上のスポット位置を該像回転プリズム（２
０）を回動して調整し、トラッキングを行なうことを特
徴とするマルチ・ビーム光ヘッド用アクチュエータ。1. It has an optical system that uses one side of the image rotation prism (20) as a fulcrum and is rotationally driven by electromagnetic force, passes a plurality of light beams through the image rotation prism (20), and connects the medium (31 ) on the image rotating prism (2
An actuator for a multi-beam optical head, characterized in that the actuator rotates and adjusts 0) to perform tracking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011905A JP2862254B2 (en) | 1989-01-23 | 1989-01-23 | Actuator for multi-beam optical head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011905A JP2862254B2 (en) | 1989-01-23 | 1989-01-23 | Actuator for multi-beam optical head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02193325A true JPH02193325A (en) | 1990-07-31 |
| JP2862254B2 JP2862254B2 (en) | 1999-03-03 |
Family
ID=11790744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1011905A Expired - Fee Related JP2862254B2 (en) | 1989-01-23 | 1989-01-23 | Actuator for multi-beam optical head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2862254B2 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5852613A (en) * | 1981-09-24 | 1983-03-28 | Ricoh Co Ltd | Optical system for light scanning |
| JPS62226118A (en) * | 1986-03-28 | 1987-10-05 | Canon Inc | Optical scanning device |
| JPH01177510A (en) * | 1988-01-07 | 1989-07-13 | Nec Corp | Image rotation actuator device and plural beam condensing optical device |
| JPH0233734A (en) * | 1988-07-22 | 1990-02-02 | Nec Corp | Prism actuator |
| JPH0255414U (en) * | 1988-10-11 | 1990-04-20 | ||
| JPH02116030A (en) * | 1988-10-24 | 1990-04-27 | Nec Corp | Image rotation actuator |
-
1989
- 1989-01-23 JP JP1011905A patent/JP2862254B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5852613A (en) * | 1981-09-24 | 1983-03-28 | Ricoh Co Ltd | Optical system for light scanning |
| JPS62226118A (en) * | 1986-03-28 | 1987-10-05 | Canon Inc | Optical scanning device |
| JPH01177510A (en) * | 1988-01-07 | 1989-07-13 | Nec Corp | Image rotation actuator device and plural beam condensing optical device |
| JPH0233734A (en) * | 1988-07-22 | 1990-02-02 | Nec Corp | Prism actuator |
| JPH0255414U (en) * | 1988-10-11 | 1990-04-20 | ||
| JPH02116030A (en) * | 1988-10-24 | 1990-04-27 | Nec Corp | Image rotation actuator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2862254B2 (en) | 1999-03-03 |
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