JPH11312344A - Optical recording medium and optical recording/ reproducing device - Google Patents

Optical recording medium and optical recording/ reproducing device

Info

Publication number
JPH11312344A
JPH11312344A JP11033898A JP3389899A JPH11312344A JP H11312344 A JPH11312344 A JP H11312344A JP 11033898 A JP11033898 A JP 11033898A JP 3389899 A JP3389899 A JP 3389899A JP H11312344 A JPH11312344 A JP H11312344A
Authority
JP
Japan
Prior art keywords
optical recording
recording layer
magneto
light
substrate
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
JP11033898A
Other languages
Japanese (ja)
Inventor
Tsutomu Matsui
勉 松井
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP11033898A priority Critical patent/JPH11312344A/en
Publication of JPH11312344A publication Critical patent/JPH11312344A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording medium such as an optical disk having a practical structure where a magneto-optical recording layer and a phase changing recording layer are laminated, and to provide an optical recording/ reproducing device therefor. SOLUTION: A first substrate 1 having a phase changing recording layer 4 formed on its surface and a second substrate 7 having a magneto-optical recording layer 10 formed on its surface are adhered by a light transmitting material 13 such that the surfaces thereof are opposite each other. By providing a differential amplifier for controlling for selectively 1 and 2 converging a laser beam L on the phase changing recording layer 4 and the magneto-optical recording layer 10 of this optical recording medium and simultaneously receiving the received light output of a reflection light from the optical recording medium and a means for selecting the outputs of the amplifier, accessing to the phase changing recording layer 4 and the magneto-optical recording layer 10 and the corresponding reproducing/recording of information are carried out at high speeds.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は光ディスク等の光記
録媒体に関し、特に同一の記録媒体に異なる記録層を積
層して記録密度を高めた光記録媒体及び光記録再生装置
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium such as an optical disk, and more particularly to an optical recording medium and an optical recording / reproducing apparatus in which different recording layers are stacked on the same recording medium to increase the recording density.

【0002】[0002]

【従来の技術】コンピュータ用磁気ディスクの高速アク
セス性と光ディスクのもつ大容量メモリを併せもつ外部
記録装置の研究が急速に進展している。次世代のディス
ク装置は、高速転送レート、高速ランダムアクセス、大
容量メモリと媒体の保存性、非接触による媒体の耐久性
等の点から光ディスク装置になることが確実とされてい
る。従来、光ディスクとして、光磁気ディスク、相変化
ディスク等種々のものが提案されているが、いずれも一
つの情報記録再生方向に基づくものであり、したがって
ディスクの1つの箇所に1つの情報を記録する構成とさ
れている。
2. Description of the Related Art Research on an external recording device having both the high-speed accessibility of a magnetic disk for a computer and the large-capacity memory of an optical disk is progressing rapidly. It is certain that the next-generation disk device will be an optical disk device in terms of a high transfer rate, a high-speed random access, a storage capacity of a large-capacity memory and a medium, a durability of the medium by non-contact, and the like. Conventionally, various types of optical disks, such as a magneto-optical disk and a phase change disk, have been proposed. However, all of them are based on one information recording / reproducing direction, and therefore, one piece of information is recorded in one place of the disk. It has a configuration.

【0003】近年、この記録容量の増大を図るために、
1つのディスクに異なる情報記録再生方式の記録層を積
層し、かく記録層に対して情報を記録することで、ディ
スクの1つの箇所に2以上の情報を記録するディスクが
提案されている。例えば、特開昭63−257946号
公報には、光記録層と磁気記録層を積層形成したもの
が、特開平2−91841号公報には光位相構造ピット
と光磁気記録層とを一体化したものが、特開平3−40
247号公報や特開平5−12751号公報には、それ
ぞれ光ディスクに光磁気記録層と相変化記録層を形成し
たものが提案されている。
In recent years, in order to increase the recording capacity,
A disc has been proposed in which recording layers of different information recording / reproducing methods are stacked on one disc and information is recorded on the recording layer, thereby recording two or more pieces of information in one place of the disc. For example, Japanese Patent Application Laid-Open No. 63-257946 discloses an optical recording layer and a magnetic recording layer which are laminated, and Japanese Patent Application Laid-Open No. 2-91841 discloses an integrated optical phase structure pit and a magneto-optical recording layer. What is disclosed in JP-A-3-40
247 and JP-A-5-12751 have proposed optical disks having a magneto-optical recording layer and a phase-change recording layer formed thereon.

【0004】[0004]

【発明が解決しようとする課題】このように、異なる記
録層を積層することで、記録密度を高めることができる
が、前記した光記録層と磁気記録層を積層したもので
は、情報の記録再生のためにはそれぞれ異なる光ヘッド
が必要であり、光記録再生装置が複雑化される。また、
光位相構造ピットと光磁気記録層とを一体化したもの
は、光位相構造ピットを書き換えることは困難である。
As described above, it is possible to increase the recording density by laminating different recording layers. However, in the case of laminating the optical recording layer and the magnetic recording layer, it is possible to record and reproduce information. For this purpose, different optical heads are required, and the optical recording / reproducing apparatus is complicated. Also,
When the optical phase structure pit and the magneto-optical recording layer are integrated, it is difficult to rewrite the optical phase structure pit.

【0005】この点で、光磁気記録層と相変化記録層を
形成したものは、1つの光ヘッドで情報の記録と再生が
可能となる点で有利である。しかしながら、特開平3−
40247号公報に記載のものは、光磁気記録層と相変
化記録層をディスクの異なる溝(トラッキング溝)に形
成しているため、同じ箇所に各記録層の情報を記録する
ことはできず、記録容量を増大する上では幾分不利とな
る。また、特開平5−12751号公報では、光磁気記
録層と相変化記録層とをどのように積層した構造とする
のかについては触れられておらず、実用化できるまでに
具体化されてはいない。
[0005] In this respect, the formation of the magneto-optical recording layer and the phase-change recording layer is advantageous in that information can be recorded and reproduced with one optical head. However, Japanese Patent Application Laid-Open
In the device described in Japanese Patent No. 40247, since the magneto-optical recording layer and the phase-change recording layer are formed in different grooves (tracking grooves) of the disk, information of each recording layer cannot be recorded in the same place. There is some disadvantage in increasing the recording capacity. Also, Japanese Patent Application Laid-Open No. 5-12751 does not mention how the magneto-optical recording layer and the phase-change recording layer are laminated, and does not materialize them until practical use. .

【0006】本発明の目的は、実用化が可能な光磁気記
録層と相変化記録層とを積層した構造が具体化された光
ディスク等の光記録媒体とその光記録再生装置を提供す
ることにある。
An object of the present invention is to provide an optical recording medium such as an optical disk having a structure in which a magneto-optical recording layer and a phase change recording layer that can be put to practical use are embodied, and an optical recording / reproducing apparatus therefor. is there.

【0007】[0007]

【課題を解決するための手段】本発明の光記録再生装置
は、基板上の異なる層にそれぞれ相変化記録層と光磁気
記録層が形成された光記録媒体に対して情報を記録再生
するための光記録再生装置であって、レーザ光を射出す
るレーザ源と、このレーザ源からの光を光記録媒体に対
して集光する対物レンズと、前記光記録媒体からの反射
光をP波とS波に分離する手段と、分離されたP波とS
波をそれぞれ受光する受光素子と、前記両受光素子の出
力の差をとる差動増幅器と、前記両受光素子の和をとる
増幅器と、前記対物レンズの集光位置を前記光記録媒体
の相変化記録層と光磁気記録層に対して選択的に設定制
御する制御手段と、この制御手段の制御動作に伴って前
記差動増幅器と増幅器の出力を選択する手段とを備える
ことを特徴とする。
SUMMARY OF THE INVENTION An optical recording / reproducing apparatus according to the present invention is for recording / reproducing information on / from an optical recording medium having a phase change recording layer and a magneto-optical recording layer formed on different layers on a substrate, respectively. An optical recording / reproducing apparatus, comprising: a laser source for emitting a laser beam; an objective lens for condensing light from the laser source on an optical recording medium; and a P-wave for reflecting light from the optical recording medium. Means for separating into S-waves, separated P-waves and S-waves
A light receiving element for receiving a wave, a differential amplifier for taking the difference between the outputs of the two light receiving elements, an amplifier for taking the sum of the two light receiving elements, and a focusing position of the objective lens for changing a phase of the optical recording medium. Control means for selectively setting and controlling the recording layer and the magneto-optical recording layer, and means for selecting the differential amplifier and the output of the amplifier in accordance with the control operation of the control means.

【0008】[0008]

【発明の実施の形態】次に、本発明の実施形態を図面を
参照して説明する。図1は本発明の光記録媒体の例を説
明する断面図である。この例では、2枚の基板を貼り合
わせた構造である。厚さが0.6〜1.2mm程度のポ
リカーボネート製の第1の光透過性の円形基板1の表面
には、同心円または渦巻状のトラッキング溝2を形成
し、その表面にはZnS−SiO2(硫化亜鉛−シリ
カ)からなる下保護膜3と、GeSbTe(ゲルマニウ
ム・アンチモン・テルル)からなる相変化記録層4と、
ZnS−SiO2からなる上保護膜5と、ZnS−Si
2 からなる表面保護膜6とを積層した0構成とされ
る。
BRIEF DESCRIPTION OF THE DRAWINGS FIG.
It will be described with reference to FIG. FIG. 1 illustrates an example of the optical recording medium of the present invention.
FIG. In this example, two substrates are attached
It is a structure that was adapted. The thickness is about 0.6 to 1.2 mm.
Surface of first light-transmitting circular substrate 1 made of carbonate
A concentric or spiral tracking groove 2
And the surface has ZnS-SiOTwo(Zinc sulfide-silicone
F) and a lower protective film 3 made of GeSbTe (germanium).
Phase change recording layer 4 made of
ZnS-SiOTwoAn upper protective film 5 made of ZnS-Si
OTwo And a surface protection film 6 made of
You.

【0009】また、同じく厚さが0.6〜1.2mm程
度のポリカーボネート製の第2の光透過性の円形基板7
の表面には、前記第1の基板1と同じ或いは異なるピッ
チの同心円または渦巻状のトラッキング溝8を形成し、
その表面にはZnS−SiO2からなる下保護膜9と、
TbFeCo(テルビウム・鉄・コバルト)からなる光
磁気記録層10と、アルミニウム薄膜等の光半透過性の
反射膜11と、ZnS−SiO2からなる上保護膜12
とを積層した構成とされる。そして、第1の基板1の表
面上に、第2の基板7の表裏を逆向きにし、各基板1,
7の中心を位置合わせした上で、両基板を0.005〜
0.1mmの厚さの光透過樹脂13で一体的に貼り合わ
せている。
A second light-transmitting circular substrate 7 made of polycarbonate, also having a thickness of about 0.6 to 1.2 mm.
A concentric circle or a spiral tracking groove 8 having the same or different pitch as the first substrate 1 is formed on the surface of the first substrate 1.
On its surface, a lower protective film 9 made of ZnS—SiO 2 ,
A magneto-optical recording layer 10 made of TbFeCo (terbium / iron / cobalt), a light translucent reflecting film 11 such as an aluminum thin film, and an upper protective film 12 made of ZnS-SiO 2
Are laminated. Then, on the surface of the first substrate 1, the front and back of the second substrate 7 are reversed, and each substrate 1,
After aligning the center of 7, both substrates
The light-transmitting resin 13 having a thickness of 0.1 mm is integrally attached.

【0010】したがって、この光ディスクでは、同図に
鎖線で示すように、後述する光ヘッドの対物レンズ1
05から投射されるレーザ光Lを、第1の基板1の裏面
側から相変化記録層4に集光させた上で、公知の手法に
より情報の書き込みが可能となり、かつ同じく情報の読
み出しが可能となる。このとき、反射膜11は、相変化
記録層4等で散乱された光が光磁気記録層10に到達さ
れることを防止する。また、同図の鎖線に示すよう
に、レーザ光を相変化記録層4を透過させて光磁気記録
層10に集光させることで、公知の手法により情報の書
き込みと読み出しが可能となる。これにより、同一の光
ヘッドを用いて相変化記録層4と光磁気記録層10に対
する情報のアクセスが可能となり、しかも各記録層では
それぞれ光に対する反射率の変化、偏光の変化を独立し
て生じさせるのみであるため、互いに他の記録層に干渉
を与えることがない。これにより、相変化記録層4と光
磁気記録層10とを積層して情報の記録容量を倍加した
光ディスクが得られる。
Therefore, in this optical disk, as shown by a chain line in FIG.
After condensing the laser light L projected from the back surface 05 onto the phase change recording layer 4 from the back side of the first substrate 1, it becomes possible to write information by a known method and also to read information. Becomes At this time, the reflection film 11 prevents light scattered by the phase-change recording layer 4 or the like from reaching the magneto-optical recording layer 10. Further, as shown by a chain line in FIG. 2, by transmitting a laser beam through the phase-change recording layer 4 and condensing it on the magneto-optical recording layer 10, information can be written and read by a known method. This makes it possible to access information to the phase change recording layer 4 and the magneto-optical recording layer 10 using the same optical head, and furthermore, in each recording layer, a change in light reflectance and a change in polarization occur independently. Because they only cause interference, they do not interfere with each other. As a result, an optical disk having the information recording capacity doubled by laminating the phase change recording layer 4 and the magneto-optical recording layer 10 can be obtained.

【0011】図2は本発明の光記録媒体の他の例を示す
断面図である。この例では、厚さが0.6〜1.2mm
程度のポリカーボネート製の光透過性の円形基板21の
表面に同心円または渦巻状のトラッキング溝22を形成
し、ZnS−SiO2からなる下保護膜23と、GeS
bTeからなる相変化記録層24と、ZnS−SiO2
からなる上保護膜25とを形成する。そして、フォトポ
リマ26を約20〜40μmの厚さにスピンコーティン
グし、かつこのフォトポリマ26を予め溝形成したニッ
ケルスタンパで圧接してゾル状の溝を形成し、さらにU
V照射してゲル化して前記トラッキング溝と同じまたは
異なるピッチのトラッキング溝27を形成する。
FIG. 2 is a sectional view showing another example of the optical recording medium of the present invention. In this example, the thickness is 0.6 to 1.2 mm
A concentric or spiral tracking groove 22 is formed on the surface of a light-transmitting circular substrate 21 made of polycarbonate, and a lower protective film 23 made of ZnS—SiO 2 and a GeS
a phase change recording layer 24 made of bTe and ZnS—SiO 2
And an upper protective film 25 made of. Then, the photopolymer 26 is spin-coated to a thickness of about 20 to 40 μm, and the photopolymer 26 is pressed with a nickel stamper having a groove formed in advance to form a sol-like groove.
The particles are gelled by V irradiation to form tracking grooves 27 having the same or different pitch as the tracking grooves.

【0012】しかる上で、その表面にZnS−SiO2
からなる下保護膜28と、TbFeCoからなる光磁気
記録層29と、ZnS−SiO2からなる上保護膜30
とを積層し、最上層に紫外線硬化樹脂をトップコーティ
ングして表面保護膜31を形成している。
On the surface, ZnS-SiO 2
A lower protective layer 28 made of a magneto-optical recording layer 29 composed of TbFeCo, protective top made of ZnS-SiO 2 film 30
Are laminated, and the uppermost layer is top-coated with an ultraviolet curable resin to form a surface protective film 31.

【0013】この光ディスクにおいても、同図に鎖線
で示すように、対物レンズ105から投射されるレーザ
光Lを基板21の裏面側から相変化記録層24に集光さ
せた上で、公知の手法により情報のアクセスが可能とな
り、また、同図の鎖線のようにレーザ光を相変化記録
層24を透過させて光磁気記録層29に集光させること
で、公知の手法により情報のアクセスが可能となり、情
報の記録容量を倍加した光ディスクが得られる。
Also in this optical disk, as shown by a dashed line in FIG. 1, a laser beam L projected from the objective lens 105 is focused on the phase change recording layer 24 from the back side of the substrate 21, and then a known method is used. , The information can be accessed, and the laser light is transmitted through the phase-change recording layer 24 and condensed on the magneto-optical recording layer 29 as indicated by the dashed line in FIG. As a result, an optical disk having twice the information recording capacity can be obtained.

【0014】図3は本発明の光記録再生装置の一実施形
態を示す構成図であり、ここでは情報を読み出す系の構
造のみを示している。レーザ源101からの射出光をコ
リメータレンズ102で平行光とし、楔プリズム103
で円形光束に整形する。そして、ビームスプリッタ10
4の第1スプリッタ面104aで後述するサーボ用出力
を取り出し、第3スプリッタ面104cでレーザ光を全
反射させる。この全反射されたレーザ光は、対物レンズ
105により図1または図2に示した光ディスクDに対
して投射され、各記録層に集光される。
FIG. 3 is a block diagram showing an embodiment of the optical recording / reproducing apparatus according to the present invention. Here, only the structure of a system for reading information is shown. The light emitted from the laser source 101 is converted into parallel light by a collimator lens 102, and a wedge prism 103
To form a circular luminous flux. And the beam splitter 10
The servo output, which will be described later, is extracted from the fourth splitter surface 104a, and the laser light is totally reflected from the third splitter surface 104c. This totally reflected laser light is projected by the objective lens 105 onto the optical disc D shown in FIG. 1 or FIG. 2, and is focused on each recording layer.

【0015】また、光ディスクDで反射された光は、第
3スプリッタ面104cで全反射され、第2スプリッタ
面104bで全反射される。全反射されたレーザ光は、
λ/4板106、λ/2板107を透過されてP波とS
波の偏光角度が90度相違する光波とされ、レンズ10
8で偏光ビームスプリッタ109に収束され、この偏光
ビームスプリッタ109によりP波とS波に分離され
る。
The light reflected by the optical disk D is totally reflected by the third splitter surface 104c and totally reflected by the second splitter surface 104b. The laser light totally reflected is
P wave and S transmitted through λ / 4 plate 106 and λ / 2 plate 107
The polarization of the wave is a light wave having a difference of 90 degrees,
At 8, the light is converged by the polarization beam splitter 109, and is separated into a P wave and an S wave by the polarization beam splitter 109.

【0016】そして、分離されたP波とS波はそれぞれ
受光素子110,111により受光される。この受光出
力はそれぞれ差動増幅器112と増幅器113に入力さ
れ、差動増幅器112において両波の差が出力され、増
幅器113において両波の合成値が出力される。そし
て、これら差動増幅器112と増幅器113の出力はセ
レクタ114によりいずれか一方が選択される。
The separated P and S waves are received by light receiving elements 110 and 111, respectively. The received light outputs are input to the differential amplifier 112 and the amplifier 113, respectively. The difference between the two waves is output from the differential amplifier 112, and the combined value of both waves is output from the amplifier 113. Either the output of the differential amplifier 112 or the output of the amplifier 113 is selected by the selector 114.

【0017】また、この光ヘッドは、トラッキングサー
ボ機構115、フォーカスサーボ機構116により、対
物レンズ105から投射される光を光ディスクDの所定
の位置でかつ所定の層上に集光させるようにサーボ制御
される。これらサーボ機構のサーボ制御は前記サーボ出
力に基づいて制御回路117により行われる。また、こ
の制御回路117はサーボ制御と同時に前記セレクタ1
14を駆動して前記各増幅器112,113からの出力
の一方を選択する。
The optical head is servo-controlled by a tracking servo mechanism 115 and a focus servo mechanism 116 so that light projected from the objective lens 105 is condensed at a predetermined position and on a predetermined layer of the optical disc D. Is done. The servo control of these servo mechanisms is performed by the control circuit 117 based on the servo output. The control circuit 117 performs the servo control and the selector 1 simultaneously.
14 to select one of the outputs from the amplifiers 112 and 113.

【0018】したがって、この光記録再生装置では、光
ディスクに対して相変化に基づく情報のアクセスを行う
場合には、フォーカスサーボ機構116をサーボ制御し
て図1または図2の光ディスクの相変化記録層4,24
に対してレーザ光を集光させる。そして、これと同時に
セレクタ114により増幅器113の出力を選択するよ
うに動作する。これにより、レーザ源101からのレー
ザ光は相変化記録層4,24に集光され、その反射光の
P波、S波はそれぞれ受光素子110,111により受
光され、各受光素子110,111で受光された受光値
が増幅器113において加算された状態で出力される。
したがって、相変化記録層4,24におけるレーザ光の
反射率の変化を検出し、情報の読み出しが可能となる。
Therefore, in this optical recording / reproducing apparatus, when accessing information on the optical disk based on the phase change, the servo control of the focus servo mechanism 116 is performed to control the phase change recording layer of the optical disk shown in FIG. 4,24
Is focused on the laser beam. At the same time, the selector 114 operates to select the output of the amplifier 113. As a result, the laser light from the laser source 101 is focused on the phase change recording layers 4 and 24, and the reflected P and S waves are received by the light receiving elements 110 and 111, respectively. The received light values are output in a state where they are added in the amplifier 113.
Therefore, it is possible to detect a change in the reflectance of the laser light in the phase change recording layers 4 and 24 and read out the information.

【0019】また、光ディスクに対して光磁気に基づく
情報のアクセスを行う場合には、フォーカスサーボ機構
116をサーボ制御して図1または図2の光ディスクの
光磁気記録層10,29に対してレーザ光を集光させ
る。そして、これと同時にセレクタ114により差動増
幅器112の出力を選択するように動作する。これによ
り、レーザ源101の光は光磁気記録層10,29に集
光され、その反射光のP波、S波はそれぞれ受光素子1
10,111により受光され、各受光素子110,11
1で受光された受光値が差動増幅器112において減算
されて状態で出力される。したがって、光磁気記録層に
おけるレーザ光の偏光状態を検出し、情報の読み出しが
可能となる。
When accessing information on the optical disk based on magneto-optics, the servo control of the focus servo mechanism 116 is performed and the magneto-optical recording layers 10 and 29 of the optical disk shown in FIG. Collect light. At the same time, the selector 114 operates to select the output of the differential amplifier 112. As a result, the light from the laser source 101 is focused on the magneto-optical recording layers 10 and 29, and the reflected P-wave and S-wave are respectively received by the light receiving element
The light is received by the light receiving elements 10 and 111 and the light receiving elements 110 and 11
The received light value received at 1 is subtracted by the differential amplifier 112 and output in a state. Therefore, information can be read by detecting the polarization state of the laser light in the magneto-optical recording layer.

【0020】このように、相変化記録層と光磁気記録層
に対するアクセスの切り替えは、制御回路117により
光ヘッドをサーボ制御して対物レンズ105の集光位置
を制御し、かつこれと同時にセレクタ114において出
力を選択すればよい。したがって、相変化記録層及び光
磁気記録層に対して交互にアクセスし、或いは一方に対
して連続的にアクセスするいずれの場合でも、高速なア
クセスが可能となる。
As described above, switching of the access to the phase change recording layer and the magneto-optical recording layer is performed by controlling the optical head by servo control of the optical head by the control circuit 117 and simultaneously controlling the focusing position of the objective lens 105. The output may be selected in. Therefore, high-speed access is possible regardless of whether the phase change recording layer and the magneto-optical recording layer are alternately accessed or one of them is continuously accessed.

【0021】なお、図3の構成は光ディスクに記録され
た情報を再生するための構成であるが、この構成に記録
用レーザ源や磁気発生手段等を付加することで、容易に
光記録が可能な光記録再生装置として構成できることは
言うまでもない。
The configuration shown in FIG. 3 is a configuration for reproducing information recorded on an optical disk. By adding a recording laser source and a magnetic generating means to this configuration, optical recording can be easily performed. Needless to say, it can be configured as an optical recording / reproducing apparatus.

【0022】[0022]

【発明の効果】以上説明したように上記光記録媒体は、
表面上に相変化記録層が形成された第1の基板と、表面
上に光磁気記録層が形成された第2の基板とが、互いの
表面が対向するように光透過材で接着され、前記第1の
基板の裏面側から当該第1の基板を通して前記相変化記
録層及び光磁気記録層に対して光を集光して情報の記録
再生を行うように構成した第1の実施形態の構成を採用
することにより、1枚の基板に対して相変化記録層と光
磁気記録層への情報の記録が可能な具体化された記録媒
体を得ることができ、しかも第1の基板側からのみ情報
の記録再生を行うので、相変化記録層と光磁気記録層と
を切り替える場合でも光磁気媒体の表裏を交換する必要
なく、記録再生操作を簡便化することができ、本発明の
光記録再生装置は、特に光記録媒体の相変化記録層と光
磁気記録層に対してレーザ光を選択的に集光する制御と
同時に、光記録媒体からの反射光の受光出力が入力され
る差動増幅器と増幅器の出力を選択する手段を備えるこ
とにより、相変化記録層と光磁気記録層に対するアクセ
スと、これに対応する情報の再生ならびに記録を高速に
行うことが可能となる。
As described above, the optical recording medium is
A first substrate having a phase-change recording layer formed on the surface and a second substrate having a magneto-optical recording layer formed on the surface are bonded to each other with a light transmitting material such that the surfaces are opposed to each other; According to the first embodiment, light is collected from the back side of the first substrate to the phase change recording layer and the magneto-optical recording layer through the first substrate to record and reproduce information. By adopting the configuration, it is possible to obtain a embodied recording medium capable of recording information on the phase change recording layer and the magneto-optical recording layer on one substrate, and from the first substrate side. Since recording and reproduction of information is performed only, even when switching between the phase change recording layer and the magneto-optical recording layer, the recording and reproducing operation can be simplified without having to exchange the front and back of the magneto-optical medium, and the optical recording of the present invention can be simplified. The playback device is particularly suitable for the phase change recording layer and the magneto-optical recording layer of the optical recording medium. A phase change recording layer and a magneto-optical device are provided by providing a differential amplifier to which the output of the reflected light from the optical recording medium is input and a means for selecting the output of the amplifier at the same time as the control for selectively condensing the laser light. Access to the recording layer and reproduction and recording of information corresponding to the access can be performed at high speed.

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

【図1】本発明の光記録媒体の一例を示すの断面図であ
る。
FIG. 1 is a sectional view showing an example of an optical recording medium of the present invention.

【図2】本発明の光記録媒体の他の例を示す断面図であ
る。
FIG. 2 is a sectional view showing another example of the optical recording medium of the present invention.

【図3】本発明にかかる光記録再生装置の要部の構成図
である。
FIG. 3 is a configuration diagram of a main part of the optical recording / reproducing apparatus according to the present invention.

【符号の説明】[Explanation of symbols]

1 第1の基板 4 相変化記録層 7 第2の基板 10 光磁気記録層 13 光透過性樹脂(接着剤) 21 基板 24 相変化記録層 29 光磁気記録層 101 レーザ源 104 ビームスプリッタ 105 対物レンズ 109 偏光ビームスプリッタ 110,111 受光素子 112 差動増幅器 113 増幅器 114 セレクタ 115 トラッキングサーボ機構 116 フォーカスサーボ機構 117 制御回路 REFERENCE SIGNS LIST 1 first substrate 4 phase change recording layer 7 second substrate 10 magneto-optical recording layer 13 light-transmitting resin (adhesive) 21 substrate 24 phase-change recording layer 29 magneto-optical recording layer 101 laser source 104 beam splitter 105 objective lens 109 polarization beam splitter 110, 111 light receiving element 112 differential amplifier 113 amplifier 114 selector 115 tracking servo mechanism 116 focus servo mechanism 117 control circuit

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】表面上に相変化記録層が形成された第1の
基板と、表面上に光磁気記録層が形成された第2の基板
とが、互いの表面が対向するように光透過材で接着さ
れ、前記第1の基板の裏側面から当該第1の基板を通し
て前期光磁気記録層に対して光を集光して情報の記録再
生を行うように構成したことを特徴とする光記録媒体。
1. A first substrate having a phase-change recording layer formed on a surface thereof and a second substrate having a magneto-optical recording layer formed on the surface are optically transmitted such that their surfaces are opposed to each other. Characterized in that light is adhered to the magneto-optical recording layer from the back surface of the first substrate through the first substrate to record and reproduce information. recoding media.
【請求項2】基板上の異なる層にそれぞれ相変化記録層
と光磁気記録層が形成された光記録媒体に対して情報を
記録再生するための光記録再生装置であって、 レーザ光を射出するレーザ源と、このレーザ源からの光
を光記録媒体に対して集光する対物レンズと、前記光記
録媒体からの反射光をP波とS波に分離する手段と、分
離されたP波とS波をそれぞれ受光する受光素子と、前
記両受光素子の出力の差をとる差動増幅器と、前記両受
光素子の和をとる増幅器と、前記対物レンズの集光位置
を前記光記録媒体の相変化記録層と光磁気記録層に対し
て選択的に設定制御する制御手段と、この制御手段の制
御動作に伴って前記差動増幅器と増幅器の出力を選択す
る手段とを備えることを特徴とする光記録再生装置。
2. An optical recording / reproducing apparatus for recording / reproducing information on / from an optical recording medium having a phase-change recording layer and a magneto-optical recording layer formed on different layers on a substrate, respectively, comprising: Laser source, an objective lens for condensing light from the laser source onto an optical recording medium, means for separating reflected light from the optical recording medium into P waves and S waves, and a separated P wave And an S-wave, respectively, a differential amplifier that takes the difference between the outputs of the two light-receiving elements, an amplifier that takes the sum of the two light-receiving elements, and a light-condensing position of the objective lens, Control means for selectively setting and controlling the phase change recording layer and the magneto-optical recording layer, and means for selecting the output of the differential amplifier and the amplifier in accordance with the control operation of the control means. Optical recording and reproducing device.
【請求項3】表面上に相変化記録層が形成された第1の
基板と、表面上に光磁気記録層が形成された第2の基板
とが、互いの表面が対向するように光透過材で接着さ
れ、前記第1の基板の裏側面から当該第1の基板を通し
て前記光磁気記録層に対して光を集光して情報の記録再
生を行う光記録媒体に対して情報を記録再生するための
光記録再生装置であって、 レーザ光を射出するレーザ源と、このレーザ源からの光
を光記録媒体に対して集光する対物レンズと、前記光記
録媒体からの反射光をP波とS波に分離する手段と、分
離されたP波とS波をそれぞれ受光する受光素子と、前
記両受光素子の出力の差をとる差動増幅器と、前記両受
光素子の和をとる増幅器と、前記対物レンズの集光位置
を前記光記録媒体の相変化記録層と光磁気記録層に対し
て選択的に設定制御する制御手段と、この制御手段の制
御動作に伴って前記差動増幅器と増幅器の出力を選択す
る手段とを備えることを特徴とする光記録再生装置。
3. A first substrate having a phase-change recording layer formed on its surface and a second substrate having a magneto-optical recording layer formed on its surface are optically transmitted such that their surfaces face each other. Recording / reproducing information on / from an optical recording medium for recording / reproducing information by condensing light from the back side surface of the first substrate to the magneto-optical recording layer through the first substrate through the first substrate; An optical recording / reproducing apparatus for emitting a laser beam, an objective lens for condensing light from the laser source onto an optical recording medium, and a light source for reflecting reflected light from the optical recording medium. Means for separating waves and S waves, a light receiving element for receiving the separated P and S waves, a differential amplifier for obtaining the difference between the outputs of the two light receiving elements, and an amplifier for taking the sum of the two light receiving elements And the condensing position of the objective lens is changed to a phase change recording layer and a magneto-optical recording layer of the optical recording medium. An optical recording / reproducing apparatus, comprising: a control means for selectively setting and controlling the differential amplifier; and a means for selecting the differential amplifier and the output of the amplifier in accordance with the control operation of the control means.
JP11033898A 1999-02-12 1999-02-12 Optical recording medium and optical recording/ reproducing device Pending JPH11312344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11033898A JPH11312344A (en) 1999-02-12 1999-02-12 Optical recording medium and optical recording/ reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11033898A JPH11312344A (en) 1999-02-12 1999-02-12 Optical recording medium and optical recording/ reproducing device

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP27720495A Division JPH09102150A (en) 1995-09-30 1995-09-30 Optical recording medium and optical recording and reproducing device

Publications (1)

Publication Number Publication Date
JPH11312344A true JPH11312344A (en) 1999-11-09

Family

ID=12399356

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11033898A Pending JPH11312344A (en) 1999-02-12 1999-02-12 Optical recording medium and optical recording/ reproducing device

Country Status (1)

Country Link
JP (1) JPH11312344A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007026630A (en) * 2005-07-15 2007-02-01 Agency For Science Technology & Research Data storage medium and method for forming thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007026630A (en) * 2005-07-15 2007-02-01 Agency For Science Technology & Research Data storage medium and method for forming thereof

Similar Documents

Publication Publication Date Title
JP3210549B2 (en) Optical information recording medium
EP0414380B1 (en) Optical recording and reproducing apparatus and adaptor for use with said apparatus
KR100770078B1 (en) Multi-layered optical disc
JPH11195243A (en) Multilayered optical disk and recording and reproducing device
JPH03157816A (en) Optical information recording member and optical information recording and reproducing device
JPH03209642A (en) Optical information medium, its production and its cassette case
US20060023615A1 (en) Optical disk and information playback apparatus
JPH09212917A (en) Optical recording medium with two information surfaces
JPH08203126A (en) Optical information recording medium, optical information reproducing method, and optical information recording, reproducing and erasing method
JP2950500B2 (en) Optical pickup for recording and reproduction for compatibility of discs with different thickness
US5959961A (en) Optical recording medium having multiple recording layers and method for recording and reproducing thereof
JPH0714231A (en) Magneto-optical disk, optical pickup, and magneto-optical disk device
JPH02244445A (en) Optical information recording medium and optical information recording and reproducing device
JP2616596B2 (en) optical disk
JPH113543A (en) Information recording medium
JPH11312344A (en) Optical recording medium and optical recording/ reproducing device
JPH1196592A (en) Optical recording medium having two superposed levels and recording device corresponding thereto as well as reading out method
JP4137830B2 (en) Recording / playback device
JPH09102150A (en) Optical recording medium and optical recording and reproducing device
JP3422732B2 (en) Light head
JPS61271627A (en) Optical disc
US20030031110A1 (en) Optical disk having multiple write layers, optical disk manufacturing method, optical disk device and optical disk write/read method
JPH06267113A (en) Optical disk exclusively used for reproduction
JPH10293942A (en) Optical information recording medium and optical information recording, reproducing and erasing method
JPH1031844A (en) Maltilayered optical information medium