JPH02273353A - Magneto-optical head signal detector - Google Patents
Magneto-optical head signal detectorInfo
- Publication number
- JPH02273353A JPH02273353A JP9462889A JP9462889A JPH02273353A JP H02273353 A JPH02273353 A JP H02273353A JP 9462889 A JP9462889 A JP 9462889A JP 9462889 A JP9462889 A JP 9462889A JP H02273353 A JPH02273353 A JP H02273353A
- Authority
- JP
- Japan
- Prior art keywords
- sensor
- magneto
- convex lens
- optical axis
- signal detector
- 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
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は光磁気ヘッドに関し、特に読出し信号検出器に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magneto-optical head, and more particularly to a read signal detector.
従来この種の光磁気ヘッド信号検出器は、第2図に示す
ような構成を有していた。媒体にこの反射光軸上にλ/
2板27.凸レンズ21.ウオーラストンプリズム22
.分割センサ23.の順に配置しλ/2板27のみを、
光軸を中心に回動させ、反射光中の互いに直交する偏光
成分を分割センサに均等に入射させる構成をとっていた
。Conventionally, this type of magneto-optical head signal detector has had a configuration as shown in FIG. λ/ on the optical axis of this reflection on the medium
2 boards 27. Convex lens 21. wallaston prism 22
.. Split sensor 23. Arrange only the λ/2 plate 27 in the order of
The sensor is rotated about the optical axis, so that the mutually orthogonal polarized components of the reflected light are incident equally on the split sensor.
また、第2の従来例としては第3図に示す様に、媒体反
射光軸上に凸レンズ31.ウオーラストンプリズム32
1分割センサ33の順に配置し、凸レンズと着接したウ
オーラストンプリズム32゜または、ウオーラストンプ
リズム32のみを、反射光軸を中心に回動させ、偏光成
分の分離を行う構成を有している。In addition, as a second conventional example, as shown in FIG. 3, a convex lens 31. wallaston prism 32
It has a configuration in which the 1-segment sensor 33 is arranged in order, and the Wollaston prism 32° attached to the convex lens, or only the Wollaston prism 32, is rotated around the reflected optical axis to separate polarized light components. ing.
上述した従来の検出器は、第2図の従来例ではλ/2板
を必要とするため、部品構成が多くなるという欠点があ
り、第3図の例にてはウオーラストンプリズムの回動に
より、第4図に示す分割センサ上のセンサA31.およ
びセンサB32.への集光点102.および集光点10
1が、矢印AA′に示す方向に回動する事から、センサ
A31゜およびセンサB32、上から外れて感度低下が
発生するという欠点がある。The conventional detector described above has the disadvantage that the conventional example shown in Fig. 2 requires a λ/2 plate, which increases the number of parts. Accordingly, sensor A31. on the split sensor shown in FIG. and sensor B32. Focus point 102. and focal point 10
Since sensor 1 rotates in the direction shown by arrow AA', sensor A 31° and sensor B 32 come off from above, resulting in a decrease in sensitivity.
本発明の光磁気ディスク読出し信号検圧器は、光媒体反
射光軸進路上に、凸レンズ、ウオーラストンプリズム、
分割センサの順に光軸上に上記3点を一体形成で光軸を
中心に、回動可能に配置した構成を有している。The magneto-optical disk read signal pressure detector of the present invention includes a convex lens, a Wallaston prism, a
It has a configuration in which the above three points are integrally formed on the optical axis in order of the divided sensors and are arranged rotatably around the optical axis.
次に、本発明に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縦断面図を示す。FIG. 1 shows a longitudinal sectional view of an embodiment of the invention.
光磁気ディスク面にて反射した光軸の進路上に、凸レン
ズ1.凸レンズと着接したウオーラストンプリズム2.
その後方の分割センサ3,03点がセンサホルダ4に一
体に着接して配置してあり、さらにセンサホルダ4がヘ
ッドケース5に対して反射光軸200を中心に回動可能
に保持され、回動固定用として止めネジ6が設けである
。A convex lens 1. Wallaston prism attached to a convex lens 2.
The rear divided sensors 3 and 03 are disposed in integral contact with the sensor holder 4, and the sensor holder 4 is further held rotatably about the reflection optical axis 200 with respect to the head case 5. A set screw 6 is provided for dynamic fixing.
次に本発明による動作および効果について説明する。光
磁気ディスク面にて反射した光線中に含まれる偏向方向
のわずかな変動を検光する為、入射した偏光を互いに直
交する2つの偏光成分に分離するウオーラストンプリズ
ム2を光路中に入れ、2つの偏光成分が略等分にとなる
様に反射光軸200を中心として回動させ、分割センサ
3にて受光層差動検出器等により読み出し信号とする構
成をとる。さらに本発明に示す様に、凸レンズ1、ウオ
ーラストンプリズム21分割センサ3を一体構成するこ
とにより、回動による第4図に示す分割センサ上の集光
点のズレ防止が可能となる。Next, the operation and effects of the present invention will be explained. In order to analyze slight variations in the polarization direction contained in the light beam reflected from the magneto-optical disk surface, a Wallaston prism 2 is inserted in the optical path to separate the incident polarized light into two mutually orthogonal polarized components. The polarized light is rotated about the reflection optical axis 200 so that the two polarized light components are approximately equally divided, and the split sensor 3 uses a light-receiving layer differential detector or the like to read out a signal. Further, as shown in the present invention, by integrally configuring the convex lens 1, the Wollaston prism 21 and the divided sensor 3, it is possible to prevent the focal point on the divided sensor shown in FIG. 4 from shifting due to rotation.
また、反射光軸に対するレンズ中心軸のズレによる分割
センサ上のズレも一体構成で製造の際に上記3点の部品
の中心軸合わせを行う事が可能となり、相対的に凸レン
ズ中心と分割センサ中心が、ズレを発生する事がなくな
る事から簡単な構成で良好な信号検器が可能となる。In addition, the shift on the split sensor due to the shift of the lens center axis with respect to the reflected optical axis can be avoided by integrating the center axis of the three parts mentioned above during manufacturing, and the center of the convex lens and the center of the split sensor can be adjusted relative to each other. However, since no deviation occurs, a good signal detector can be achieved with a simple configuration.
以上説明したように、本発明は、凸レンズ。 As explained above, the present invention relates to a convex lens.
ウオーラストンプリズム、および分割センサを体構成で
、かつ回動できるように構成したことにより、信号の検
出は良好なまま、構成が簡単に、かつ調整も簡単になる
という効果がある。By configuring the Wallaston prism and the split sensor so that they can be rotated in a body configuration, there is an effect that the configuration is simple and the adjustment is simple while the signal detection remains good.
第1図に本発明の信号検出器縦断面図、第2図、および
第3図は、従来例の縦断面図、第4図は本発明、および
従来例の分割センサの説明図である。
1・・・・・・凸レンズ、2・・・・・・ウオーラスト
ンプリズム、3・・・・・・分割センサ、4・・・・・
・センサホルダ、5・・・・・・ヘッドケース、6・・
・・・・止めネジ、27・・・・・・λ/2板、40・
・・・・・ホルダ、20・・・・・・λ板ホルダ、41
・・・・・・センサA142・・・・・・センサB、1
01゜102・・・・・・集光点、200・・・・・・
反射光軸。
代理人 弁理士 内 原 晋
=5
天
\FIG. 1 is a vertical cross-sectional view of a signal detector according to the present invention, FIGS. 2 and 3 are vertical cross-sectional views of a conventional example, and FIG. 4 is an explanatory diagram of a split sensor according to the present invention and a conventional example. 1...Convex lens, 2...Wollaston prism, 3...Divided sensor, 4...
・Sensor holder, 5...Head case, 6...
... Set screw, 27 ... λ/2 plate, 40.
...Holder, 20...λ plate holder, 41
...Sensor A142 ...Sensor B, 1
01゜102...Focusing point, 200...
reflected optical axis. Agent Patent Attorney Susumu Uchihara = 5 Ten
Claims (1)
上に少なくとも凸レンズ、ウォーラストンプリズムおよ
び分割光センサをこの順に前記反射光の光軸上に一体形
成して前記光軸を中心に回転可能に配置したことを特徴
とする光磁気ヘッド信号検出器。In the signal detector of the magneto-optical head, at least a convex lens, a Wollaston prism, and a splitting optical sensor are integrally formed in this order on the optical axis of the reflected light on the path of the reflected light of the optical medium, and are rotatable about the optical axis. A magneto-optical head signal detector characterized in that:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9462889A JPH02273353A (en) | 1989-04-14 | 1989-04-14 | Magneto-optical head signal detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9462889A JPH02273353A (en) | 1989-04-14 | 1989-04-14 | Magneto-optical head signal detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH02273353A true JPH02273353A (en) | 1990-11-07 |
Family
ID=14115528
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9462889A Pending JPH02273353A (en) | 1989-04-14 | 1989-04-14 | Magneto-optical head signal detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH02273353A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5428596A (en) * | 1991-10-18 | 1995-06-27 | Sony Corporation | Optical pickup apparatus |
-
1989
- 1989-04-14 JP JP9462889A patent/JPH02273353A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5428596A (en) * | 1991-10-18 | 1995-06-27 | Sony Corporation | Optical pickup apparatus |
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