JPH02185729A - Optical disk device - Google Patents
Optical disk deviceInfo
- Publication number
- JPH02185729A JPH02185729A JP1003321A JP332189A JPH02185729A JP H02185729 A JPH02185729 A JP H02185729A JP 1003321 A JP1003321 A JP 1003321A JP 332189 A JP332189 A JP 332189A JP H02185729 A JPH02185729 A JP H02185729A
- Authority
- JP
- Japan
- Prior art keywords
- laser
- optical
- semiconductor laser
- type semiconductor
- head
- 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 48
- 239000004065 semiconductor Substances 0.000 claims abstract description 18
- 239000000758 substrate Substances 0.000 claims description 9
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 abstract description 3
- 239000000057 synthetic resin Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔概要〕
半導体レーザを光学へ・ンドに取りつけた光ディスク装
置に関し、
光学ヘッドから円形のレーザ光を出射することを目的と
し、
高述回転する光ディスクの揚力によりディスク面上に浮
上してレーザ光を照射する光学ヘッドが、面発光型の半
導体レーザ或いは出射面一ヒに凸レンズを設けた面発光
型の半導体レーザを含んで光ディスク装置を構成する。[Detailed Description of the Invention] [Summary] Regarding an optical disk device in which a semiconductor laser is attached to an optical head, the object is to emit a circular laser beam from an optical head, and the lift force of a highly rotating optical disk is used to emit a circular laser beam onto the disk surface. An optical disk device includes an optical head that floats on the surface and emits laser light, and includes a surface-emitting type semiconductor laser or a surface-emitting type semiconductor laser having a convex lens provided on its output surface.
本発明は断面が円形のレーザ光を出射するフライイング
ヘッド（Ｆｌｙｉｎｇ−ｈｅａｄ）を備えた光ディスク
装置に関する。The present invention relates to an optical disc device equipped with a flying head that emits a laser beam having a circular cross section.
近年、レーザ光を用いて情報の記録・再生および消去を
行う光ディスクに対する需要は高まっており、電算機用
記憶装置として嘱望されている。In recent years, there has been an increasing demand for optical discs that record, reproduce, and erase information using laser light, and are expected to be used as storage devices for computers.
また、民生用としてはコンパクトディスク（ＣＤ）が普
及してきており、パソコンなどにも使用されている。Furthermore, compact discs (CDs) have become popular for consumer use, and are also used in personal computers and the like.
光ディスクは従来より使用されている磁気ディスクに較
べて、
■ 記録容量が大きい。Optical disks have a larger recording capacity than conventionally used magnetic disks.
■ 塵埃の影響を無くすことができる。■ Can eliminate the influence of dust.
などの長所をもっている。It has advantages such as
すなわち、磁気ディスクは１ビツトの情報記録に数１０
〜数１００μｍ ｌの面積が必要であるのに較べて光デ
ィスクはレーザ光をレンズによって直径が約１μｍの小
さなスポットに絞り込むことができるので１ビツトの情
報記録に要する面積が約１μｌｌ１ｚ程度で足り、その
ため大容量記録が可能である。In other words, a magnetic disk requires several tens of times to record one bit of information.
Compared to an optical disk, which requires an area of several hundred micrometers, the laser beam can be narrowed down to a small spot with a diameter of about 1 micrometer using a lens, so the area required to record one bit of information is only about 1 micrometer. Large capacity recording is possible.
また、レンズで絞り込まれたレーザ光の焦点面までの距
離は１〜２閣とることができ、光ディスク基板の上面で
のレーザ光の径は約１閣となるため、例えディスク基板
上に大きさが数１０μｍの塵埃が存在していても記録と
再生に殆ど影響を与えずに済ませることができる。In addition, the distance to the focal plane of the laser beam narrowed down by the lens can be 1 to 2 degrees, and the diameter of the laser beam on the top surface of the optical disk substrate is about 1 degree, so even if the size of the laser beam on the disk substrate is Even if there is dust of several tens of micrometers in size, recording and reproduction can be done with almost no effect.
光ディスクはこのような特徴がある反面、情報の転送速
度に関しては磁気ディスクに較べて遜色があり、情報処
理装置の記憶装置として使用するには転送速度の向上が
必要であった。Although optical disks have these characteristics, they are inferior to magnetic disks in terms of information transfer speed, and it is necessary to improve the transfer speed in order to use them as storage devices in information processing devices.
磁気ディスクは所謂るフライイングヘッド（Ｆｌｙｉｎ
ｇ−ｈｅａｄ）を用いているために情報の転送速度は２
０〜５０ａ秒と高速である。The magnetic disk has a so-called flying head (Flyin head).
g-head), the information transfer rate is 2.
It is fast at 0 to 50 a seconds.
すなわち、情報の記録・再生および消去を行う磁気ヘッ
ドはスライダの後部に固定されており、磁気ディスクの
高速回転に伴って生ずる空気流による揚力をスライダが
受け、０．２μｍ程度の微少間隙を隔て一磁気ディスク
面から浮上し、この状態で磁気ヘッドのコイルに信号電
流を通ずることにより情報の記録・再生および消去が行
われているため、情報の転送速度は高速である。In other words, the magnetic head for recording, reproducing, and erasing information is fixed at the rear of the slider, and the slider receives the lift force from the airflow generated by the high-speed rotation of the magnetic disk, and the magnetic head is separated by a minute gap of about 0.2 μm. Since the information is recorded, reproduced, and erased by flying above the surface of the magnetic disk and passing a signal current through the coil of the magnetic head in this state, the information transfer speed is high.
一方、光ディスクは半導体レーザを光源とし、複数のレ
ンズ、ミラー、プリズムよりなる光学系を用い、レーザ
光を径１μ麟程度のスポットに集光しているため、光学
系の重量は増し、迅速な駆動が難しいために、情報の転
送速度は磁気ディスクに較べて遜色がある。On the other hand, optical discs use a semiconductor laser as a light source and use an optical system consisting of multiple lenses, mirrors, and prisms to focus the laser light onto a spot with a diameter of about 1 μm, which increases the weight of the optical system and increases speed. Because they are difficult to drive, their information transfer speed is inferior to that of magnetic disks.
そこで、転送速度を向上するためレーザ光源を固定し、
ミラーやレンズのみを駆動することにより高速化が行わ
れているが、情報の転送速度は約１００ ｍｍ秒と磁気
ディスクに較べると遅い。Therefore, in order to improve the transfer speed, we fixed the laser light source and
Although speeds have been increased by driving only mirrors and lenses, the information transfer speed is approximately 100 mm seconds, which is slower than magnetic disks.
そこで、この問題を解決する方法として半導体レーザを
スライダに固定し、フライイングヘッドとした光ディス
ク装置が考案された。Therefore, as a method to solve this problem, an optical disk device was devised in which a semiconductor laser was fixed to a slider and used as a flying head.
（に、Ｉｔａｏ他、Ｉｎｔｅｒｎａｔｉｏｎａｌ Ｓｙ
ｍｐｏｓｉｕｍ ｏｆ ０ｐｔｉｃａＩ Ｍｅｍｏｒｉ
ｅｓ、ｐ１３３．１９８７）然し、このフライイングヘ
ッドに使用した半導体レーザはストライブ構造をした端
面出射型のレーザであり、ストライブ部が超短形状をし
ているために楕円形状の発散型ビームになり、有効な使
用ができないと云う問題があった。(In, Itao et al., International Sy.
mposium of 0pticaI Memory
(ES, p133.1987) However, the semiconductor laser used in this flying head is an edge-emitting type laser with a stripe structure, and because the stripe part has an ultra-short shape, it produces an elliptical diverging beam. There was a problem that it could not be used effectively.
端面出射型レーザが出射する楕円形状の発散型ビームを
円形にすることはシリンドリカルレンズやプリズムを使
用することにより可能であり、またビーム径を約１μｍ
に集光することはレンズの使用により可能であるが、こ
のような光学部品をフライイングヘッドの半導体レーザ
に装着することは不可能であり、か−る試みは未だ行わ
れていない、
そこで、約１μ−に集光した円形のレーザビームを出射
する半導体レーザを備えたフライイングヘッドを実用化
することが課題である。The elliptical diverging beam emitted by an edge-emitting laser can be made circular by using a cylindrical lens or prism, and the beam diameter can be reduced to approximately 1 μm.
It is possible to focus the light to The challenge is to put into practical use a flying head equipped with a semiconductor laser that emits a circular laser beam focused to about 1 μm.
上記の課題は高速回転する光ディスクの揚力によりディ
スク面上に浮上してレーザ光を照射する光学ヘッドが、
面発光型の半導体レーザ或いは出射面上に凸レンズを設
けた面発光型の半導体レーザを含んで光ディスク装置を
構成することにより解決することができる。The problem mentioned above is that the optical head, which floats above the disk surface and irradiates laser light due to the lift of the optical disk rotating at high speed,
This problem can be solved by constructing an optical disk device including a surface-emitting type semiconductor laser or a surface-emitting type semiconductor laser having a convex lens provided on the emission surface.
〔作用〕
本発明は端面出射型の半導体レーザの代わりに合成樹脂
よりなるレンズを備えた面発光レーザを用いるものであ
る。[Function] The present invention uses a surface-emitting laser equipped with a lens made of synthetic resin instead of an edge-emitting type semiconductor laser.
第４図はこの一例としてガリウム・インジウム・砒素・
燐組成（ＧａｌｎＡｓ Ｐ ／Ｉｎ Ｐ ）の円形埋込
み型の面発光レーザの構造を示すもので、ｎ−１ｎＰ基
板１の上にｎ−Ｇａ１ｎＡｓ Ｐ層２とｐ−ＩｎＰ層３
をヘテロエピタキシャル成長させた後に、活性領域とな
るｐ−Ｇａ１ｎＡｓ Ｐ層４とｐ−１ｎＰ層５をヘテロ
エピタキシャル成長させ、Ａｕ−Ｚｎ電極６を形成した
後、光共振が行われる中央部を除いてエツチングし、こ
の中央部の周囲にｎ−１ｎＰとｐ−１ｎＰを交互にエピ
タキシャル成長させて平坦化する。Figure 4 shows an example of gallium, indium, arsenic,
This shows the structure of a circular buried surface emitting laser with a phosphorus composition (GalnAs P /In P ), in which an n-Ga1nAs P layer 2 and a p-InP layer 3 are formed on an n-1nP substrate 1.
After the p-Ga1nAs P layer 4 and the p-1nP layer 5 which will become the active region are heteroepitaxially grown, and the Au-Zn electrode 6 is formed, etching is performed except for the central part where optical resonance occurs. , n-1nP and p-1nP are epitaxially grown alternately around this central portion for planarization.
次に、ｎ−１ｎＰ基板１の上にＡｕＳｎ電極７を形成し
たる後に、レーザの出射位置をエツチングして穴開けし
、この穴の底に反射鏡として働＜ ５ｉＯｚ／ ＴｉＯ
２多層膜８を形成することにより面発光レーザが形成さ
れている。Next, after forming the AuSn electrode 7 on the n-1nP substrate 1, a hole is made by etching at the laser emission position, and a <5iOz/TiO
By forming the two multilayer films 8, a surface emitting laser is formed.
本発明は、この第４図に示すような面発光レーザを用い
てフライング型の光学ヘッドを作るものであり、この結
果、記録密度を向上することが可能となった。The present invention uses a surface emitting laser as shown in FIG. 4 to produce a flying optical head, and as a result, it has become possible to improve the recording density.
また、この効果は面発光レーザの出射穴に透明な合成樹
脂を滴下した後に硬化させ、レンズを形成することによ
り更に高めることができる。Furthermore, this effect can be further enhanced by dropping transparent synthetic resin into the emission hole of the surface emitting laser and then curing it to form a lens.
第２図はか−るレーザの断面図であって、凸レンズを形
成するのに適した樹脂としてはポリメチルメタクリレー
ト（略称ＰＭＭＡ） 、ポリカーボネート（略称ＰＣ）
、シリコーン樹脂やエポキシ樹脂などを挙げることが
できる。Figure 2 is a cross-sectional view of such a laser, and resins suitable for forming the convex lens include polymethyl methacrylate (abbreviated as PMMA) and polycarbonate (abbreviated as PC).
, silicone resin, epoxy resin, etc.
本発明はか＼るレーザ素子を光源として使用することに
より、１μＭ径で円形なレーザビームを得るものである
。The present invention uses such a laser element as a light source to obtain a circular laser beam with a diameter of 1 μM.
第２図はか−る面発光レーザ素子１１をスライダ１２に
装着した光学ヘッド（フライイングヘッ゛ド）１３の断
面図であり、また第１図は軽量合金よりなるジンバル１
４に装着した光学ヘッド１３が、矢印の方向に高速で回
転する光ディスク基板１５の揚力により微少距離だけ浮
上し、透明な光ディスク基板１５を通して記録膜１６を
照射し、情報の記録・再生および消去を行う状態を示し
ている。FIG. 2 is a sectional view of an optical head (flying head) 13 in which such a surface emitting laser element 11 is attached to a slider 12, and FIG. 1 is a sectional view of a gimbal 1 made of a lightweight alloy.
The optical head 13 mounted on the optical disk 4 floats a short distance due to the lifting force of the optical disk substrate 15 rotating at high speed in the direction of the arrow, and irradiates the recording film 16 through the transparent optical disk substrate 15 to record, reproduce, and erase information. Indicates the state to be performed.
厚さ３柵、直径が２００圓のガラス基板の上にインジウ
ム（Ｉｎ）とアンチモン（Ｓｂ）を原子量比で４０：６
０となるように真空蒸着して厚さが１０００人の記録膜
を形成し、記録・再生および消去が可能な光ディスクを
形成した。Indium (In) and antimony (Sb) are placed in an atomic weight ratio of 40:6 on a glass substrate with a thickness of 3 and a diameter of 200 mm.
A recording film having a thickness of 1,000 was formed by vacuum evaporation so that the film had a thickness of 0.0, and an optical disc capable of recording, reproducing, and erasing was formed.
この光ディスクを］、、Ｏｍ／ｓの速度で回転させた状
態では本発明に係る面発光型半導体レーザを装着した光
学ヘッドは１μｍの高さに浮上した。When this optical disk was rotated at a speed of ], Om/s, the optical head equipped with the surface-emitting semiconductor laser according to the present invention floated to a height of 1 μm.
この状態で情報の記録には光学ヘッドを構成する面発光
レーザ素子から出力が３ｍＷ、また再生は０．５ｍＷの
出力で、また消去は１．５６１Ｗの出力でレーザ光を照
射して行ったが記録膜には径１μｍのビームを照射する
ことができ、従来の光学系を用いた場合と同様な結果を
得ることができた。In this state, information was recorded by irradiating laser light with an output of 3 mW from the surface emitting laser element that constitutes the optical head, reproduction with an output of 0.5 mW, and erasing with a laser beam with an output of 1.561 W. The recording film could be irradiated with a beam with a diameter of 1 μm, and results similar to those obtained using a conventional optical system could be obtained.
本発明の実施により、円形のレーザ光を出射し、１μ−
程度にまで集光できると共に、情報の転送速度を従来の
磁気ディスクと略同様な値にまで高めることができる。By implementing the present invention, a circular laser beam is emitted and a 1μ-
In addition to being able to focus light to a certain extent, it is also possible to increase the information transfer speed to a value that is approximately the same as that of conventional magnetic disks.
第１図は本発明に係る光学ヘッドを備えた光ディスク装
置の概略図、
第２図は本発明に係る面発光レーザを備えた光学ヘッド
の断面図、
第３図は本発明に係る面発光レーザ素子の断面図、
第４図は円形埋込み型面発光レーザー素子の断面図、
である。
図において、
１０は凸レンズ、 １１は面発光レーザー素子、
１２はスライダ、 １３は光学ヘッド、１４はジ
ンバル、 １５は透明ディスク基板、１６は記録
膜、
である。
木尭明ｔｚ係る光営ヘッ旧口冷えた光ディスク装置の概
略同第
木亮朗［こ係る面亮先し一デ１鴫えた光営ヘッＹ゛の断
面同第
図FIG. 1 is a schematic diagram of an optical disk device equipped with an optical head according to the present invention, FIG. 2 is a sectional view of an optical head equipped with a surface emitting laser according to the present invention, and FIG. 3 is a schematic diagram of a surface emitting laser according to the present invention. A cross-sectional view of the device. FIG. 4 is a cross-sectional view of a circular buried surface emitting laser device. In the figure, 10 is a convex lens, 11 is a surface emitting laser element,
12 is a slider, 13 is an optical head, 14 is a gimbal, 15 is a transparent disk substrate, and 16 is a recording film. A schematic diagram of the optical disc device of Koei's head, which was cold in the old days, according to Akiaki Mok.
Claims (3)
ーザ光を照射し、該記録膜に情報の記録・再生および消
去を行う光ディスク装置において、高速回転する光ディ
スクの揚力により該ディスク面上に浮上してレーザ光を
照射する光学ヘッドが、面発光型の半導体レーザを含ん
でなることを特徴とする光ディスク装置。(1) In an optical disc device that records, reproduces, and erases information on the recording film by irradiating a recording film formed on an optical disc substrate with a laser beam, the lifting force of the optical disc rotating at high speed causes the light to rise on the disc surface. An optical disc device characterized in that an optical head that floats and irradiates laser light includes a surface-emitting semiconductor laser.
に凸レンズを設けたことを特徴とする光学ヘッド。(2) An optical head characterized in that a convex lens is provided on the emission surface of the surface-emitting semiconductor laser according to claim 1.
光型の半導体レーザの該凸レンズがレーザ光の出射穴に
透明樹脂を注入し、硬化させたものからなることを特徴
とする光学ヘッド。(3) An optical device according to claim 2, wherein the convex lens of the surface-emitting semiconductor laser provided with a convex lens on the emission surface is made of a transparent resin injected into the laser beam emission hole and cured. head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003321A JP2875269B2 (en) | 1989-01-10 | 1989-01-10 | Optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1003321A JP2875269B2 (en) | 1989-01-10 | 1989-01-10 | Optical disk drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02185729A true JPH02185729A (en) | 1990-07-20 |
| JP2875269B2 JP2875269B2 (en) | 1999-03-31 |
Family
ID=11554091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1003321A Expired - Fee Related JP2875269B2 (en) | 1989-01-10 | 1989-01-10 | Optical disk drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2875269B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6219332B1 (en) * | 1997-06-20 | 2001-04-17 | Seagate Technology Llc | Slider for optical disc data storage system |
| JP2005045049A (en) * | 2003-07-23 | 2005-02-17 | Seiko Epson Corp | Electrooptical element and manufacturing method thereof, optical module, and driving method thereof |
| US7157743B2 (en) | 2002-03-01 | 2007-01-02 | Seiko Epson Corporation | Surface-emitting light-emitting device and method of manufacturing the same, optical module, and light-transmission device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59115532U (en) * | 1983-01-24 | 1984-08-04 | オムロン株式会社 | Detector frame structure |
| JPS62192030A (en) * | 1986-02-19 | 1987-08-22 | Hitachi Ltd | Optical card recording and reproducing device |
| JPS62275332A (en) * | 1986-05-23 | 1987-11-30 | Nippon Telegr & Teleph Corp <Ntt> | Optical head |
| JPS6321692A (en) * | 1986-07-15 | 1988-01-29 | アンリツ株式会社 | Led display unit and manufacture thereof |
-
1989
- 1989-01-10 JP JP1003321A patent/JP2875269B2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59115532U (en) * | 1983-01-24 | 1984-08-04 | オムロン株式会社 | Detector frame structure |
| JPS62192030A (en) * | 1986-02-19 | 1987-08-22 | Hitachi Ltd | Optical card recording and reproducing device |
| JPS62275332A (en) * | 1986-05-23 | 1987-11-30 | Nippon Telegr & Teleph Corp <Ntt> | Optical head |
| JPS6321692A (en) * | 1986-07-15 | 1988-01-29 | アンリツ株式会社 | Led display unit and manufacture thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6219332B1 (en) * | 1997-06-20 | 2001-04-17 | Seagate Technology Llc | Slider for optical disc data storage system |
| US7157743B2 (en) | 2002-03-01 | 2007-01-02 | Seiko Epson Corporation | Surface-emitting light-emitting device and method of manufacturing the same, optical module, and light-transmission device |
| JP2005045049A (en) * | 2003-07-23 | 2005-02-17 | Seiko Epson Corp | Electrooptical element and manufacturing method thereof, optical module, and driving method thereof |
| US7446293B2 (en) | 2003-07-23 | 2008-11-04 | Seiko Epson Corporation | Electro-optical element and method for manufacturing thereof, optical module and method for driving thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2875269B2 (en) | 1999-03-31 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |