JPS58196640A - Magnetooptic recording and reproducing device - Google Patents

Magnetooptic recording and reproducing device

Info

Publication number
JPS58196640A
JPS58196640A JP7950282A JP7950282A JPS58196640A JP S58196640 A JPS58196640 A JP S58196640A JP 7950282 A JP7950282 A JP 7950282A JP 7950282 A JP7950282 A JP 7950282A JP S58196640 A JPS58196640 A JP S58196640A
Authority
JP
Japan
Prior art keywords
light
recording
component
recording medium
beam splitter
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
JP7950282A
Other languages
Japanese (ja)
Inventor
Tsuneo Yanagida
柳田 恒男
Kiichi Kato
喜一 加藤
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical Co 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP7950282A priority Critical patent/JPS58196640A/en
Publication of JPS58196640A publication Critical patent/JPS58196640A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B11/00Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
    • G11B11/10Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
    • G11B11/105Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing

Abstract

PURPOSE:To ensure good recording without increasing the output of a light source and at the same time to improve the S/N of reproduced light, by providing a beam splitter having different values of transmissivity to the P and S polarizations of the recording/reproducing light to an optical system. CONSTITUTION:A beam splitter 14 is set between a laser diode 1 functioning as a laser light source for recording/reproducing and a recording medium 6. When a laser beam receives P polarization, the transmissivity is set at <=50% for the P polarization component. While the transmissivity of the S polarization component is set at 100%. As a result, the >=50% laser beam is made incident to the medium 6 to ensure the satisfactory writing of information. Furthermore, the polarization component, i.e., the signal component which is turned by a Kerr effect can be led nearly 100% toward a photodetector 11. This process improves the S/N of the reproduced light.

Description

【発明の詳細な説明】 本発明は磁気光学効果を利用した磁気光学記録再生装置
に係り、特に光学系の記録再生効率の改善手段に関する
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magneto-optical recording and reproducing device that utilizes the magneto-optical effect, and particularly to means for improving the recording and reproducing efficiency of an optical system.

第1図は従来のこの釉の磁気光字配録M’に装置におけ
る光学系の一例を示す図である。第1図において、lは
配録・再生用の光ビームを発射する光源としてのレーデ
ダイオードであり、2社上記ビームを平行光にコリメー
トするコリメートレンズ、3はレーデダイオードからの
出力光を偏光させる偏光子である。また4は上V偏光子
3からの光をle録媒体方向へ50−反射すると共に記
録媒体からの反射光を検出器方向へ50饅透過させるビ
ームスプリッタ、5は上Fビームスプリッタ4からの光
を配録媒体上へ集光照射する対物レンズ、6はたとえば
磁気光学ディスク等からなる記録媒体、7は配録時にお
いて74”イアス磁界を印加するためのバイアス磁界印
加コイルである。さらに8は前記ビームスシリツ44を
透過した記録媒体6からの反射光を、サーメ系信号検出
器方向と情報信号検出器方向とに分けるビームスプリッ
タ、9d非点収差を利用してフォーカスエラー信号を得
る場合に使用されるシリンドリカルレンズ、10はフォ
ーカスエラー信号およびトラックエラー信号略のサーl
系信号を検出する一ti−&系信号検出器である。また
11は記録媒体6からの反射光における偏光面の回転状
態から悄@信号光を得るだめの検光子で例えばグラント
ムソングリズムなどの複屈折ノリズムまたは偏光ピーム
スグリ、り尋からなる。そして、12は上P情報信号光
を電気信号に変換して画像情報勢の情報信号を得る情報
信号検出器である。
FIG. 1 is a diagram showing an example of an optical system in a conventional glaze magneto-optical character arrangement M'. In Figure 1, 1 is a Raded diode as a light source that emits a light beam for recording and reproduction, 2 is a collimating lens that collimates the beam into parallel light, and 3 is a collimating lens that collimates the beam output from the Raded diode. It is a polarizer that polarizes light. Further, 4 is a beam splitter that reflects the light from the upper V polarizer 3 toward the recording medium and transmits the reflected light from the recording medium toward the detector, and 5 is the light from the upper F beam splitter 4. 6 is a recording medium made of, for example, a magneto-optical disk, 7 is a bias magnetic field applying coil for applying a 74'' IA magnetic field during recording. A beam splitter that divides the reflected light from the recording medium 6 that has passed through the beam splitter 44 into the thermal signal detector direction and the information signal detector direction, and is used when obtaining a focus error signal using 9d astigmatism. A cylindrical lens 10 indicates a focus error signal and a track error signal.
This is a ti-& system signal detector for detecting system signals. Reference numeral 11 denotes an analyzer for obtaining signal light from the rotational state of the plane of polarization in the reflected light from the recording medium 6, and is composed of a birefringence norism such as the Glan-Thompson rhythm, or a polarized beam ray. Reference numeral 12 denotes an information signal detector which converts the upper P information signal light into an electric signal to obtain an information signal of image information type.

このような構成の従来の光学系によれば、例えば記録媒
体6の配録面にP偏光を入射させると、P偏光の偏向面
が記録面の磁化の向きに応じて第2図に示す如く+θK
または一θになるカー回転角だけ回転することになる。
According to the conventional optical system with such a configuration, for example, when P-polarized light is incident on the recording surface of the recording medium 6, the polarization plane of the P-polarized light changes as shown in FIG. 2 according to the direction of magnetization of the recording surface. +θK
Alternatively, it will rotate by a Kerr rotation angle of 1 θ.

したがって上記回転状態を検出することにより、情報信
号を得ることができる。しかるに上l!ヒ構成の従来の
光学系には次のような問題があった。
Therefore, by detecting the rotational state, an information signal can be obtained. However, the top! Conventional optical systems with the H configuration have the following problems.

スナわち、ビームスシリツタ4の反射率を81とし、記
録媒体6からの反射光の強度を工とし、この反射光がビ
ームスプリッタ4を信号検出器12の方向へ透過する際
の透過光強度を1、とすると、上記透過光強度Itは It=(1−Rl)I“□“ となる。したがって、通常使用されているR1=5(l
のビームスプリッタを用いると、透過光強度Itは反射
光強度の棒となる。なお−1反射光強度はレーザビーム
強度の棒である。し九がって迅過光強度Itなる信号光
のすNは著しく低下するととKなる。上記1′Nを改善
すべく反射率R1を小さくし、相対的に透過光強度It
を大きくすると、記録時における記録媒体6への入射光
量が低下し良質な記録を行なえなくなる。
In other words, the reflectance of the beam splitter 4 is set to 81, the intensity of the reflected light from the recording medium 6 is calculated, and the transmitted light intensity when this reflected light passes through the beam splitter 4 in the direction of the signal detector 12. is 1, the transmitted light intensity It=(1-Rl)I"□". Therefore, the commonly used R1=5(l
When using a beam splitter, the transmitted light intensity It becomes a bar of reflected light intensity. Note that -1 reflected light intensity is a bar of laser beam intensity. Therefore, when the signal light intensity It, which is the signal light intensity, decreases significantly, it becomes K. In order to improve the above 1'N, the reflectance R1 is made small, and the transmitted light intensity It is relatively
If the value is increased, the amount of light incident on the recording medium 6 during recording will decrease, making it impossible to perform high-quality recording.

特に記録媒体6の感度が比較的悪い場合には、配−を行
なえなくなるおそれもある。またS/Jを向上させる他
の手段としてレーデダイオード1の出力アップをはかり
媒体6からの反射光強度1を大きくすることも考えられ
るが、とのようにすると、レーザダイオ−PJの発熱に
よるーbへの影響が著しくなり、装置の寿命を短かくす
る。
Particularly if the sensitivity of the recording medium 6 is relatively low, there is a possibility that the arrangement may not be possible. Another way to improve S/J is to increase the output of the laser diode 1 to increase the intensity 1 of the reflected light from the measuring medium 6. This will have a significant effect on Rubb and shorten the life of the device.

上記の間fJi i、t 、もう一つのビームスプリッ
タ8についても同様のことが言える。
The same can be said about the other beam splitter 8 during the above period fJi,t.

本発明はこのような従来の装置の問題を解決1、v −
y’ / 4オーp*o+s。8カケ、え、  1に良
好な記録を行なえ、しかも再生光のS/Nを向上させ得
る構成の簡単な磁気光学記録再任装置を提供することを
目的とする。
The present invention solves the problems of such conventional devices 1, v-
y'/4o p*o+s. It is an object of the present invention to provide a magneto-optical recording reassignment device with a simple configuration that can perform good recording on 8 chips and 1, and can improve the S/N of reproduction light.

以下、図面を参照して本発明の実施例について説明する
Embodiments of the present invention will be described below with reference to the drawings.

第3図は本発明の一実施例の光学系を示す図である。た
だし第1図と同一箇所には同一符号を付し、その部分の
詳細な説明は省略する。第3図において前記第1図と異
なる点は偏光子3が削除されている点と、反射面に多層
誘電体膜を設けることによシ、P偏光成分と8偏光成分
に対する透過率を異ならせたビームスプリッタ14を用
いた点である。
FIG. 3 is a diagram showing an optical system according to an embodiment of the present invention. However, the same parts as in FIG. 1 are given the same reference numerals, and detailed explanations of those parts will be omitted. The difference between FIG. 3 and FIG. 1 is that the polarizer 3 is removed, and by providing a multilayer dielectric film on the reflective surface, the transmittance for the P-polarized light component and the 8-polarized light component is different. This is because a beam splitter 14 is used.

すなわち、ハーフミラ−と称される従来のビームスシリ
ツタ4は偏光成分に関係なく、5゜−づつの透過率と反
射率とを有しているが、本装置におけるビームスシリ、
りI4はレーザビームがP偏光を受けたものである場合
にFip偏光成分に対しては透過率50チ以下とし、S
偏光成分に対しては透過率100%に設定されている。
That is, the conventional beam sintering device 4 called a half mirror has a transmittance and a reflectance of 5° regardless of the polarization component, but the beam sintering in this device
When the laser beam receives P-polarized light, I4 has a transmittance of 50 cm or less for the Fip-polarized component, and S
The transmittance is set to 100% for polarized light components.

したがって虻録時においては、記録用レーザビームのs
o4以上のノダワーがビームスシリツ414により反射
されて記録媒体6上に集光照射される。その結果、記録
媒体6の感度の良否とは直接関係なく十分良好な書込み
を行なえる。
Therefore, when recording, the recording laser beam s
The dower of o4 or more is reflected by the beam series 414 and is focused and irradiated onto the recording medium 6. As a result, sufficiently good writing can be performed regardless of whether the sensitivity of the recording medium 6 is good or bad.

また、再生時においても、再生用レーザビームの501
以上が記録媒体6上に集光照射されるので確実に記録情
報の読取りを行彦える。
Also, during reproduction, the reproduction laser beam 501
Since the above light is condensed and irradiated onto the recording medium 6, the recorded information can be reliably read.

一方、記録媒体6からの反射光は、前述したようにカー
効果によって+θKまたは一θにだけ回転する。
On the other hand, the reflected light from the recording medium 6 is rotated by only +θK or 1θ due to the Kerr effect, as described above.

第4図は+θにだけ回転した場合の状態を示す図である
。この図からも明らかなように、+θになるカー回転を
受けたときの記録媒体6がらの反射光RにおけるP偏光
成分RPの光強度IPおよびS偏光成分R8の光強[I
Sは、カー回転を受けないときの記録媒体6からの反射
光の強1をlとすると、 IP = Ias2119K  ・・・・・・・・・・
・・・・・・・・(1)I8=1*20K ・・・・曲
・・曲・・・・(2)となる。したがりてカー−転角θ
には と表わされる。
FIG. 4 is a diagram showing the state when rotated only to +θ. As is clear from this figure, the light intensity IP of the P polarization component RP and the light intensity [I
S is the intensity 1 of the reflected light from the recording medium 6 when it is not subjected to Kerr rotation, where l is IP = Ias2119K...
・・・・・・・・・(1) I8=1*20K ・・・Song...Song...(2) Therefore, the car rotation angle θ
It is expressed as.

今、ビームスグリ、り14のP偏光成分に対する光透過
率を、TP、8偏光酸分に対す光透過率をTSとすると
、ビームスプリッタ14を透過する光のP偏光成分RP
’の光強度I P’およびS偏光成分RS’の光強度I
 S’は(1) (2)式からIP’= TP −IP
 = TP・■326K・・・・・・・・・(4)I8
’= TS −Is = TS −Igln2θK・・
・・・・・・<5)となる。ここでTPは50%以下で
あり、TSはほぼ100%であるため、 IP’≦卜P ・・・・・・・・・・・・・・・・・・
(6)Is’ζIs   ・・・・・・・・・・・・・
・・・・・(7)となる。その結果、第4図に示す如く
、みかけ上のカー回転角θに′が大きなものとなる。こ
のθに′となる。
Now, if the light transmittance for the P-polarized light component of the beam currant 14 is TP, and the light transmittance for the 8-polarized acid is TS, then the P-polarized light component RP of the light transmitted through the beam splitter 14 is
'light intensity I P' and light intensity I of S polarization component RS'
S' is obtained from equations (1) and (2), IP' = TP - IP
= TP・■326K・・・・・・・・・(4)I8
'= TS - Is = TS - Igln2θK...
...<5). Here, TP is less than 50% and TS is almost 100%, so IP'≦卜P ・・・・・・・・・・・・・・・・・・
(6) Is'ζIs ・・・・・・・・・・・・
...(7). As a result, as shown in FIG. 4, the apparent Kerr rotation angle θ becomes large. This θ becomes ′.

ところで、配録媒体6からの反射光の楕円化を無視すれ
ば、信号成分であるS偏光成分Isは、検光子11への
入射光強度をIA、検光子設定角をθA、カー回転角を
θにとすると、l5−= IA* 2θAg1n2θに
で与えられる。したがって、ビームスノリツタ14等に
よる検光子11への入射光強度IAの低下は、カー回転
角θKが増大することにより補うことができる。かくし
て@i+述の如く、カー回転角がθKからθに′に増加
することにより、検光子11への入射光強1r−IAの
低下を防止でき、S/Nを向上させ得ることになる。た
だし、上記の如く、P偏光成分の透過率TPを小さくす
ることにより、みかけ上のカー(ロ)転角θに′は増大
するが、P偏光成分の透過率を極端に小さくすると、光
強度の絶対イーが低下し、でしまい、フォーカス制御や
トラッキング1ilI岬のためのサ    1−ゲ系信
号が十分得られなくなる。したがって、この場合の信号
成分であるS偏光成分Its−して透過し、単なるノぐ
ワーとして働くP偏光成分は50%以下の適当な量だけ
透過させることが望ましい。
By the way, if the ellipticalization of the reflected light from the recording medium 6 is ignored, the S-polarized light component Is, which is a signal component, is determined by the following formula: IA is the intensity of light incident on the analyzer 11, θA is the analyzer setting angle, and Kerr rotation angle is When θ, it is given by l5-=IA*2θAg1n2θ. Therefore, the decrease in the intensity IA of the incident light on the analyzer 11 due to the beam snorriter 14 or the like can be compensated for by increasing the Kerr rotation angle θK. In this way, as mentioned above, by increasing the Kerr rotation angle from θK to θ′, it is possible to prevent the intensity of light incident on the analyzer 11 from decreasing 1r-IA, and to improve the S/N ratio. However, as mentioned above, by reducing the transmittance TP of the P-polarized light component, the apparent Kerr(b) turning angle θ increases, but if the transmittance of the P-polarized light component is extremely reduced, the light intensity The absolute value of the signal decreases, and it becomes impossible to obtain a sufficient signal for focus control and tracking. Therefore, it is desirable that the S-polarized light component, which is the signal component in this case, be transmitted as its-signal component, and that the P-polarized light component, which acts as a mere nozzle, be transmitted by an appropriate amount of 50% or less.

なお、本装置において透過率を50−以下とし、50−
を上限とした理由は、記録時に50−の反射が得られれ
ば、記録媒体6への書き込みを支障なく行なえ、しかも
再生時のす−♂系用の信号レベルも十分大きなものとな
し得るからである。上記50チとした場合のノ9ワーは
、ハーフミラ−を用いた場合と同勢となる。つま抄本装
置のビームスプリ、414は記録再生用のレーデビーム
のノやり−については従来から用いられているハーフミ
ラ−と同様に働き、信号成分についてはほぼ100チ透
過させる如く働く点に特徴がある。
In addition, in this device, the transmittance is set to 50- or less, and the transmittance is set to 50- or less.
The reason why this is set as the upper limit is that if a reflection of 50- is obtained during recording, writing to the recording medium 6 can be performed without any trouble, and the signal level for the female system during playback can also be made sufficiently large. be. In the case of the above-mentioned 50 inches, the force is the same as in the case of using a half mirror. The beam splitter 414 of the tsuma-shu book apparatus functions in the same manner as a conventionally used half mirror in directing the radar beam for recording and reproducing, and is characterized in that it functions to transmit approximately 100 beams of signal components.

また本装置においては、第1図に示されている偏光子3
を省略できる点にも特徴がある。すなわち上記偏光子3
は特に再生時においてレーデダイオードIから出射した
レーデビームの偏光度を一層よくするために設けられて
いるが、本装置においては、たとえばP偏光により再生
を行なう場合、たとえ偏光子3がなくてもS偏光につい
てはビームスグリツタ14により100慢透過され、記
録媒体6にはP偏光成分のみが入射することになる。そ
の結果偏光子3を省略できるものである。
In addition, in this device, the polarizer 3 shown in FIG.
Another feature is that it can be omitted. That is, the polarizer 3
is provided especially to further improve the degree of polarization of the Rade beam emitted from the Rade diode I during reproduction, but in this device, even if the polarizer 3 is not used, when reproducing using P-polarized light, for example. The S-polarized light is transmitted slowly by the beam sinter 14, and only the P-polarized light component is incident on the recording medium 6. As a result, the polarizer 3 can be omitted.

第5図は本発明の他の実施例を示す図で、第3図と同一
部分には同一符号を付しである。第5図に示すビームス
グリ、り24はレーデダイオードlからのP偏光レーデ
ビームをle録媒体6に入射させる場合を例にとると、
P偏光成分に対する反射率を50−以下、S偏光成分に
対する反射率を100−に設定されている。したがって
、記録媒体゛6には第3図の場合と同様に50−以上の
P偏光成分が入射し、記録媒体6からの反射光は50−
以下のP偏光成分と100−のS偏光成分が反射面で反
射されて検出器側へ導かれる。上記ビームスプリッタ2
4で反射され検出器側へ導かれたレーデビームはシリン
ダトリカルレンズ25.検光子26を経て検出器27に
供給される。上記検出器27はサーC系の信号および情
報信号を同時的に検出する如く集積された検出器でおり
、その検出信号は図示しない信号処理回路で分離される
FIG. 5 is a diagram showing another embodiment of the present invention, in which the same parts as in FIG. 3 are given the same reference numerals. Taking as an example the case where the beam currant 24 shown in FIG.
The reflectance for the P-polarized light component is set to 50- or less, and the reflectance for the S-polarized light component is set to 100-. Therefore, P-polarized light components of 50- or more are incident on the recording medium 6 as in the case of FIG. 3, and the reflected light from the recording medium 6 is 50-
The following P polarized light components and 100- S polarized light components are reflected by the reflecting surface and guided to the detector side. Beam splitter 2 above
The Radhe beam reflected by the cylinder lens 25. The light is supplied to a detector 27 via an analyzer 26. The detector 27 is an integrated detector that simultaneously detects a signal of the circuit C system and an information signal, and the detected signal is separated by a signal processing circuit (not shown).

第5図の如く構成された装置においては、第3図に示し
たサーメ系信号を取出すだめのビームスプリッタ8を省
略できる利点がある。
The apparatus configured as shown in FIG. 5 has the advantage that the beam splitter 8 shown in FIG. 3 for extracting the thermal signals can be omitted.

なお本発、明は上述した実施例に限定されるものではな
い。たとえば第3図示の第1の実施例ではレーザダイオ
ードIからのレ−デビームがP偏光のものである場合に
ついて説明したが、S偏光のものである場合においても
、ビームスプリッタ14の透過率をP偏光成分に対して
は10018偏光成分に対しては50チ以下とすること
により、上記実施例の場合と同様の作用効果を奏する。
Note that the present invention is not limited to the embodiments described above. For example, in the first embodiment shown in FIG. 3, a case has been described in which the laser beam from the laser diode I is P-polarized, but even when it is S-polarized, the transmittance of the beam splitter 14 is By setting the polarization component to 50 or less for 10018 polarization components, the same effects as in the above embodiment can be obtained.

また前記第1の実施例ではビームスゲIJ 、 414
について;のみ、P偏光成分に対する透過率とS偏光成
分に対する透過率を異ならせた場合を例示したが、ビー
ムスシリ。
In addition, in the first embodiment, Beam Suge IJ, 414
Regarding; only the case where the transmittance for the P-polarized light component and the transmittance for the S-polarized light component are different is illustrated, but the beam sushiri.

夕8についても14と同様の透過率の設定を行なっても
よい。ただし、ビームスデリッ48においては、配録媒
体6に入射する光がP偏光のものであれば、ビームスデ
リッ418の反射面に対してはS偏向入射となるので、
この場合のビームスデリッ48における各偏向成分に対
する透過率は、P偏光成分に対しては100慢、S偏向
成分に対しては5〇−以下とすればよい。
The same transmittance settings as in 14 may also be made for 8th. However, in the Beam Sderby 48, if the light incident on the recording medium 6 is P-polarized, it will be S-polarized incident on the reflective surface of the Beam Sderby 418.
In this case, the transmittance of the beam filter 48 for each polarization component may be 100 or less for the P polarization component and 50 or less for the S polarization component.

こうすることにより、ビームスプリ、りZ4における作
用と同様の作用がこのビームスシリツタ8についても生
じることになる。したがって、S/Nを低下させずにサ
ー?系に必要な光量を確保できることになる。
By doing so, the same effect as that in the beam splitter Z4 will occur in the beam splitter 8 as well. Therefore, it is possible to obtain a signal without reducing the S/N. This means that the amount of light necessary for the system can be secured.

以上説明したように本発明によれば、光源と配録媒体と
の間に、配録再生光のP偏光成分およびS偏光成分のう
ちの一方を100%の透過率(または50−以下の反射
率)とし、他方を50慢以下の透過率(または100チ
の反射率)としたビームスプリッタを配設したので、記
録    1□ 媒体には50%以上のレーザビームを入射させて十分な
情報の書込みまたは読出しを行なうととが可能になると
共に、カー効果により回転した偏光成分すなわち信号成
分を適当なパワーを伴った状態でほぼ100−検出器側
へ導くことが可能となる。したがってレーザダイオード
等の光源の出力を変えずに良好なIピ録を行なえ、しか
も再生光のS/Nを向上させることのできる構成簡単な
磁気光学記録再生装置を提供できる。
As explained above, according to the present invention, one of the P-polarized component and the S-polarized component of the recorded and reproduced light is transmitted between the light source and the recording medium at a transmittance of 100% (or a reflection of 50- or less). Since we installed a beam splitter with one side having a transmittance of less than 50 degrees (or a reflectance of 100 degrees), the laser beam of more than 50% is incident on the recording medium to obtain sufficient information. It becomes possible to perform writing or reading, and it also becomes possible to guide the polarized light component, that is, the signal component rotated by the Kerr effect, to the approximately 100-detector side with appropriate power. Therefore, it is possible to provide a magneto-optical recording/reproducing device with a simple configuration, which can perform good I-recording without changing the output of a light source such as a laser diode, and can improve the S/N of reproduction light.

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

第1図は従来の装置の光学系の構成を示す図、第2図は
第1図に示す装置のカー回転の状態を示す図、第3図は
本発明の一実施例における光学系の構成を示す図、第4
図は同集施例の作用を説明するための原理図、第5図は
本発明の他の実施例における光学系の構成を示す図であ
る。 1・・・レーザダイオード(光源)、2・・・コリメー
トレンズ、4.8.It、24・・・ビームスプリッタ
、3・・・偏光子、5・・・対物レンズ、6・・・記録
媒体、7・・・バイアス磁界印加コイル、’9.25・
・・シリンドリカルレンズ、IO・・・サー?系信号検
出器、I Z 、 26・・・検光子、12・・・情報
信号検出器、21・・・集積型の検出器。 出願人代理人  弁理士 鈴 江 武 彦才1図 才2区 「 千3図 才4図 S 才5図 手続補正書 昭和57年r・ 1月1;゛・ 日 1、事件の表示 特願昭 57−79502  号 3、補正をする者 事件との関係 特許出願人 (037)オリノ・ぞス光学工業株式会社4、代理人 6、補正の対象 明細書全文 7、補正の内容
FIG. 1 is a diagram showing the configuration of an optical system of a conventional device, FIG. 2 is a diagram showing the state of Kerr rotation of the device shown in FIG. 1, and FIG. 3 is a diagram showing the configuration of an optical system in an embodiment of the present invention. Figure 4 showing
The figure is a principle diagram for explaining the operation of the embodiment, and FIG. 5 is a diagram showing the configuration of an optical system in another embodiment of the present invention. 1... Laser diode (light source), 2... Collimator lens, 4.8. It, 24... Beam splitter, 3... Polarizer, 5... Objective lens, 6... Recording medium, 7... Bias magnetic field application coil, '9.25.
... Cylindrical lens, IO... Sir? System signal detector, IZ, 26... Analyzer, 12... Information signal detector, 21... Integrated type detector. Applicant's representative Patent attorney Hikosai Suzue 1 Zusai 2 Section 103 Zusai 4 S S. 5 Procedural amendment 1980 r. January 1; 57-79502 No. 3, Relationship with the case of the person making the amendment Patent applicant (037) Orino Zos Optical Industry Co., Ltd. 4, Agent 6, Full text of the specification to be amended 7, Contents of the amendment

Claims (1)

【特許請求の範囲】[Claims] 光源と配録媒体との間に、配録・再生光のP偏光成分お
よびS偏光成分のうちの一方を100−の透過率(また
は50チ以下の反射率)とし他方を50%以下の透過率
(または100チの反射率)としたビームスシリ、りを
配設したことを特徴とする磁気光学hピ録再生装置。
Between the light source and the recording medium, one of the P-polarized light component and the S-polarized light component of the recording/reproduction light has a transmittance of 100- (or a reflectance of 50 or less) and the other has a transmittance of 50% or less. What is claimed is: 1. A magneto-optical recording/reproducing device characterized in that a beam beam is provided with a reflectance of 100 cm (or a reflectance of 100 cm).
JP7950282A 1982-05-12 1982-05-12 Magnetooptic recording and reproducing device Pending JPS58196640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7950282A JPS58196640A (en) 1982-05-12 1982-05-12 Magnetooptic recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7950282A JPS58196640A (en) 1982-05-12 1982-05-12 Magnetooptic recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS58196640A true JPS58196640A (en) 1983-11-16

Family

ID=13691699

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7950282A Pending JPS58196640A (en) 1982-05-12 1982-05-12 Magnetooptic recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS58196640A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59129955A (en) * 1983-01-12 1984-07-26 Sony Corp Optical magnetic reproducing device
EP0141679A2 (en) * 1983-11-08 1985-05-15 Sharp Kabushiki Kaisha Optical system in a magneto-optical memory device
JPS6111951A (en) * 1984-06-27 1986-01-20 Canon Inc Optical head device
JPS61237240A (en) * 1985-04-12 1986-10-22 Alps Electric Co Ltd Photomagnetic recording and reproducing device
JPS61237241A (en) * 1985-04-12 1986-10-22 Alps Electric Co Ltd Photomagnetic recording and reproducing device
JPS63100644A (en) * 1986-10-17 1988-05-02 Canon Inc Magneto-optical information reproducing device
WO1991007749A1 (en) * 1989-11-16 1991-05-30 Sony Corporation Optical pickup device and magnetooptical reproducing apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59129955A (en) * 1983-01-12 1984-07-26 Sony Corp Optical magnetic reproducing device
EP0141679A2 (en) * 1983-11-08 1985-05-15 Sharp Kabushiki Kaisha Optical system in a magneto-optical memory device
JPS6111951A (en) * 1984-06-27 1986-01-20 Canon Inc Optical head device
JPH0580736B2 (en) * 1984-06-27 1993-11-10 Canon Kk
JPS61237240A (en) * 1985-04-12 1986-10-22 Alps Electric Co Ltd Photomagnetic recording and reproducing device
JPS61237241A (en) * 1985-04-12 1986-10-22 Alps Electric Co Ltd Photomagnetic recording and reproducing device
JPS63100644A (en) * 1986-10-17 1988-05-02 Canon Inc Magneto-optical information reproducing device
WO1991007749A1 (en) * 1989-11-16 1991-05-30 Sony Corporation Optical pickup device and magnetooptical reproducing apparatus

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