JPH041929A - Optical information recording/reproducing device - Google Patents

Abstract

PURPOSE:To attain the use of a small sized aperture lens of high NA and to obtain a small sized and light-weight optical head by starting and stopping the floating of a slider to which the aperture lens is attached together with a contact secured to a CSS (contact start/stop) area of an optical disk. CONSTITUTION:A record/reproduction area 24 and a production layer 25 are provided at the outer circumferential part of a single-sheet disk substrate 23 in an optical disk 1 together with a CSS area including no recording thin film provided at the inner circumferential part of the substrate 23 respectively. Then a drive means 26 is added to the disk 1, and an optical head 19 floats up in accordance with the revolution and the movement of the disk 1 with a prescribed distance kept from the disk 1 with the resistance of the ambient gas and performs the recording/reproducing jobs of information on each recording thin film of the disk 1. The head 19 is set in the CSS area at start/stop of the rotation and the movement of the disk 1. Thus a small sized aperture lens of high NA is obtained together with a small sized and light-weight head 19.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は光ディスクに情報を記録再生する光情報記録再
生装置に関し　特に光ディスクの表面を浮上してレーザ
光で信号を記録再生する光情報記録再生装置に関するも
のであも 従来の技術 光ディスクを記録媒体として用いた記録再生装置Ｃヨ　
　記録密度で磁気記録再生装置に優る力（アクセス速度
は十分とは言えな〜　これ（よ　信号を記録再生する記
録再生ヘッドの質量の違いによム即板　磁気ヘッドは非
常に軽量・小型であるのに対して、光ヘッドは大型で重
（ｌ　このような課題を解決する方法として、分離光学
系方式の光ヘッドがあも　また　面記録密度の点で４！
　　光ディスクがトラック密度の優位性から数倍から１
０倍程度高密度であム しかし　ドライブ装置として比較するとメモリ容量はほ
ぼ同じレベルにあも　これは　磁気ヘッドが非常に小型
なの℃　磁気ディスクを複数枚積み上げたスタック構造
を採用できることにその理由があａ　従って、光ディス
クのメモリ容量を上げるにｌ−Ｌ　　面記録密度の向上
と光ヘッドの小型化による光ディスクのスタック化が課
題であも光記録の面記録密度Ｄ（よ　光波長をλ、絞り
レンズの開口数をＮＡとしてＤｏ：　（ＮＡ／λ）２で
あるか収　面記録密度を高くするには波長を短くする力
＼　レンズのＮＡを高くする二通りのアプローチがあａ 光波長λを短波長化【友　半導体レーザ技術の進歩を待
たねばならな１〜　現ｉ６７０ｎｍの半導体レーザの開
発が急がれている力（これ以下の波長のレーザを可能に
する結晶材料はまだ実用に耐えるものがなく、絞りレン
ズのＮＡを上げるのが現実的であも しかし　光ビームをディスク基板を通して記録層に照射
して信号を記録再生する従来の光ディスク構造ではレン
ズの作動距離ＷＤ　（ワーキングデイスタンス；　　Ｗ
　ｏｒｋｉｎｇ　　Ｄ　１ｓｔａｎｃｅ）が長く、　レ
ンズのＮＡを上げることＣ戴　　直接レンズの大型化に
つながりヘッドを小型にできな（〜　また　光ディスク
は面振れが１００μｍ程度あり、可動範囲の広いレンズ
アクチュエータが必要なことも光ヘッドの小型化を妨げ
てい丸 従来の光情報記録再生装置としてζよ　例えば特開昭６
４−３５７３４号公報に示されていも第６図はこの従来
の光情報記録再生装置の構成図を示すものであり、　ｌ
は光ディス久　２は光ディスクを回転させるモー久　３
はモータの回転線４はコリメート光１１を出射する固定
光学部　５はレーザ光１３を光ディスクｌのトラック１
６に集光させる可動光学区　６はレー吠　７はレーザ６
の出射光を平行光に整形するコリメート光ンＸ８は光デ
ィスク１からの反射光をレーザ６に戻さないでフォトデ
ィテクタ１１に反射して信号を検出するための偏光ビー
ムスプリッ久　９はλ／４［１０は非点収差を発生させ
るシリンドリカルレンＸ　　１１は光ディスク１からの
反射光を受光してサーボ信号や再生信号を検出するフォ
トデイチク久　１２はコリメートレンズ７をフォーカシ
ングするために動かすアクチュエー久　１３はコリメー
ト光　１４は全反射ミラー　１５はコリメート光１３を
光ディスク１のトラック１６に集光する絞りレンス　１
６は信号を記録再生するトラッ久　１７はリニアモー久
　１８はレールであも以上のように構成された光情報記
録再生装置について以下動作について説明すも 第６図において、光ヘツド部は固定光学部４と移動光学
部５に分割され　移動光学部５を回転する光ディスクｌ
の径方向にリニアモータ１７でレール１８に沿って移動
させて目的のトラックをアクセスすａ　コリメートレン
ズ７で集光されたレーザ６のコリメート光１３は全反射
ミラー１４で反射され　絞りレンズ１５で光ディスク１
のトラック１６にほぼ垂直に集光されも　光ディスク１
からの反射光４友　λ／４板９の作用で偏光ビームスプ
リッタ８でほぼ全反射され　シリンドリカルレンズ１０
を介してフォトディテクタ１１に入射すも　フォトディ
テクタ１１１；Ｌ　　シリンドリカルレンズ１０の非点
収差でフォーカス誤差信号を、またファーフィールド・
プッシュプル法ででトラッキング誤差信号を検出すも　
光ディスクｌの面振れによって生ずる絞りレンズ１５の
フォーカスずれは　コリメートレンズ７をアクチュエー
タ１２で駆動することによって合焦点状態にすも　レー
ザ６をデータ信舟で記録パワーレベルで強度変調するこ
とによって対応したトラックにデータが記録され　記録
媒体の情報に応じて再生されも発明が解決しようとする
課題 しかしながら上記のような構成で４Ｌ　　アクチュエー
タ１２は固定光学部４のコリメートレンズ７を光ディス
ク１の面振れ量と同程度移動させる必要があり、アクチ
ュエータ１２が大型化し駆動パワーが必要でありｔも また　可動光学部５は　レール１８に沿って移動するこ
とでトラック検索を行うため光ディスクｌの面振れ以上
の作動距離ＷＤであった　そのた八　高ＮＡの絞りレン
ズを使うとレンズ直径が大きくなり、光ヘッドが大型化
するという課題を有してい九 本発明はかかる点に鑑へ　高ＮＡの絞りレンズを持った
小型軽量の光ヘッドと、高密度記録再生ができる光情報
記録再生装置を提供することを目的とすも 課題を解決するための手段 本発明は　レーザ光線の照射によって検出可能な複数の
状態間を可逆的または非可逆的に変化する記録薄膜を単
板ディスク基板の外周部に形成した領域１の記録再生領
域と、記録薄膜表面にさらに必要に応じて形成した光学
的に透明で高々数百ミクロンメートルの厚さの保護層を
有し　単板ディスク基板の内周部に記録薄膜のない領域
２のＣ８５（コンタクト　スタート　アンド　ストップ
；　Ｃｏｎｔａｃｔ　５ｔａｒｔ　ａｎｄ　５ｔｏｐ）
領域を具備した記録媒体と、記録媒体を回転または移動
させるための駆動手段と、記録媒体の両面にそれぞれ近
接して配置され　記録媒体の回転　移動にともない周囲
の気体の抵抗によって所定の距離を保ちつつ浮上し　記
録媒体の各記録薄膜上に情報に応じた記録再生を行う光
ヘッドを備え　光ヘッドは記録媒体の回転　移動の開始
及び停止時にＣ８Ｓ領域に位置するように構成されも 作用 本発明は上記した構成により、光ヘッドを記録再生領域
の記録媒体上に気体層を介して浮上させて、光ディスク
の面振れに追従せしめることによって絞りレンズと記録
媒体面との間隔変化を抑えて、絞りレンズの高ＮＡ化と
小型化を可能とし強いては光ヘッドの小へ　軽量化が図
れ　光ディスクの回転開始或いは停止時にはＣ８Ｓ領域
に光ヘッドを待避することて　光ヘッドと記録媒体の摺
動で記録薄膜が破壊されることをも防止すも実施例 以下本発明の実施例の光情報記録再生装置について、図
面を参照しながら説明すも 第１図は本発明の第１の実施例である光情報記録再生装
置の構成図であム　第１図において第６図と同じ番号は
第６図の構成要素と同じものを表す。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical information recording and reproducing device for recording and reproducing information on an optical disc, and particularly relates to an optical information recording and reproducing device that flies above the surface of an optical disc and records and reproduces signals using a laser beam. Even if it is a conventional technology, it is a recording/reproducing device Cyo that uses an optical disk as a recording medium.
It is superior to magnetic recording and reproducing devices in terms of recording density (although access speed is not sufficient).This is due to the difference in mass of the recording and reproducing head that records and reproduces signals.Magnetic heads are extremely lightweight and small. On the other hand, optical heads are large and heavy (l) As a way to solve these problems, an optical head with a separate optical system has been developed.It also has an areal recording density of 4!
Optical discs have increased by several times to 1 due to their superior track density.
However, when compared as a drive device, the memory capacity is about the same.The reason for this is that the magnetic head is extremely small.℃The reason for this is that it can adopt a stacked structure in which multiple magnetic disks are piled up. a Therefore, in order to increase the memory capacity of optical disks, it is necessary to stack optical disks by increasing the areal recording density and miniaturizing the optical head. If the numerical aperture of the lens is NA, then Do: (NA/λ)2 or convergence To increase the surface recording density, shorten the wavelength＼ There are two approaches to increasing the NA of the lensa Shorten the optical wavelength λ We have to wait for the progress of semiconductor laser technology (1) The development of the current i670nm semiconductor laser is urgently needed (there is still no practical crystal material that enables lasers with wavelengths smaller than this). However, in the conventional optical disc structure in which signals are recorded and reproduced by irradiating a light beam onto the recording layer through the disc substrate, the working distance (WD) of the lens is
Orking D (1stance) is long, and it is necessary to increase the NA of the lens.It directly increases the size of the lens, making it impossible to make the head smaller (~ Also, optical disks have surface runout of about 100 μm, so a lens actuator with a wide movable range is required. For example, Japanese Patent Laid-Open No. 6
Although shown in Japanese Patent No. 4-35734, FIG. 6 shows a configuration diagram of this conventional optical information recording and reproducing device.
is the optical disc 2 is the mokyu that rotates the optical disc 3
The rotating line 4 of the motor is the fixed optical part that emits the collimated light 11. The line 5 is the fixed optical part that emits the collimated light 11.
Movable optical zone to focus light on 6 6 is laser beam 7 is laser 6
A collimating beam X8 that shapes the emitted light from the optical disk 1 into parallel light is a polarizing beam splitter for detecting a signal by reflecting the reflected light from the optical disk 1 to the photodetector 11 without returning it to the laser 6.9 is λ/4[10 is a cylindrical lens X that generates astigmatism; 11 is a photodetector that receives reflected light from the optical disk 1 and detects a servo signal or a reproduction signal; 12 is an actuator that moves the collimating lens 7 for focusing; 13 is a collimated light 14 is a total reflection mirror 15 is an aperture lens 1 that focuses the collimated light 13 onto the track 16 of the optical disk 1
Reference numeral 6 indicates a track for recording and reproducing signals; 17 indicates a linear motor; and 18 indicates a rail. 4 and a moving optical section 5, and the optical disk l rotates in the moving optical section 5.
A linear motor 17 is used to move the laser 6 in the radial direction along a rail 18 to access the target track.The collimated light 13 of the laser 6 is focused by the collimating lens 7, is reflected by the total reflection mirror 14, and is reflected by the aperture lens 15 into the optical disc. 1
The light is focused almost perpendicularly onto the track 16 of the optical disc 1.
The reflected light from the 4 friends is almost totally reflected by the polarizing beam splitter 8 due to the action of the λ/4 plate 9, and is reflected by the cylindrical lens 10.
The focus error signal is input to the photodetector 11 via the photodetector 111;L due to the astigmatism of the cylindrical lens 10,
The tracking error signal can be detected using the push-pull method.
The out-of-focus of the aperture lens 15 caused by surface wobbling of the optical disk l can be brought into focus by driving the collimating lens 7 with the actuator 12.The track alignment can be addressed by intensity modulating the laser 6 with the recording power level using a data signal. However, with the above configuration, the 4L actuator 12 adjusts the collimating lens 7 of the fixed optical section 4 to the same amount as the amount of surface runout of the optical disk 1. Since the movable optical section 5 performs track search by moving along the rail 18, the working distance WD is longer than the surface runout of the optical disk 1. In addition, when a high NA aperture lens is used, the lens diameter becomes large and the optical head becomes large. It is an object of the present invention to provide a lightweight optical head and an optical information recording and reproducing device capable of high-density recording and reproducing. The recording and reproducing area of area 1 is formed by forming a recording thin film that changes irreversibly or irreversibly on the outer periphery of a single disk substrate, and the optically transparent recording and reproducing area formed on the surface of the recording thin film as necessary is at most several hundred micrometers. C85 (Contact 5tart and 5top) in area 2 with no recording thin film on the inner periphery of the single disc substrate.
A recording medium having a region, a driving means for rotating or moving the recording medium, and a driving means arranged close to each side of the recording medium on both sides of the recording medium. The present invention operates even if the optical head is configured to be located in the C8S area at the start and stop of rotation and movement of the recording medium. With the above configuration, the optical head is made to float above the recording medium in the recording/reproducing area through the gas layer, and is made to follow the surface wobbling of the optical disk, thereby suppressing changes in the distance between the aperture lens and the recording medium surface, and the aperture lens By making it possible to increase the NA and downsize the optical head, it is possible to make the optical head smaller and lighter.By retracting the optical head to the C8S area when the optical disk starts or stops rotating, the recording thin film is removed by the sliding between the optical head and the recording medium. Embodiment An optical information recording/reproducing apparatus according to an embodiment of the present invention will be explained below with reference to the drawings. FIG. 1 shows an optical information recording apparatus according to a first embodiment of the present invention. 1 is a block diagram of the reproducing apparatus. In FIG. 1, the same numbers as in FIG. 6 represent the same components as in FIG. 6.

１９は外部に設けられたレーザ光源（図示せず）から供
給されるコリメート光１３を絞って光ディスク１の記録
層２４に集束して信号を記録再弘或いは書換を行う浮上
式光ヘッドで、第６図の可動光学部５に相当す＆　　２
０はコリメート光１３をほぼ直角に反射する全反射プリ
ズム　２１は絞りレンス　２２は絞りレンズ２１と全反
射プリズム２０を記録層２４に気体層を介して浮上さす
セラッミクなどからなるスライダー、　２３はガラス或
いはセラミックやＡ１合金基材からなるディスク基材、
２４はトラック１６が形成され信号を記録再生する記録
層　２５は記録層２４を湿度やスライダー２２の不測の
接触による摩耗やダメージから保護する薄い保護Ｊｉ、
　　２６は浮上式光ヘッド１９のスライダー２２が浮上
開始及び浮上停止時にコンタクトするＣ８Ｓ領＠２７は
浮上式光ヘッド１９が浮上して信号を記録再生する記録
再生領域であも 上記のように構成された　光情報記録再生装置について
以下詳しく動作を説明すも モータ２が停止しているとき、浮上式光ヘッド１９は光
ディスク１の内周部に設けたＣ８Ｓ領域２６に降りてい
ａ　モータ２が回転を開始し　光ディスク１の回転数が
所定の速度に達すると、スライダー２２が気体の圧力で
浮上するし　浮上式光ヘッド１９をリニアモータで記録
領域２７に移送すも 次凶　レーザ光源が点灯され　固定光学部からのコリメ
ート光１３が全反射プリズム２０で反射され　絞りレン
ズ２１で光ディスク１の記録層２４にほぼ垂直に集束さ
れ　ツーカス・トラッキング制御がかけられて、信号の
記録再生が行われもスライダー２２＆友　光ディスク１
の周速度とスライダー２２の形状及び浮上光ヘッド１９
の質量で決まる浮上高さで保護層２５と気体層を介して
浮上すａ　例えば　１グラム程度の浮上光へ・リド１９
なら回転数１．　８０Ｏｒｐｍで面積１ｃｍ”程度のス
ライダー２２で、数μｍから１０μｍの浮上高さが得ら
れ　最内周と最外周では約数μｍの差が生じも　この絞
りレンズ２１のフォーカスずれは　公知のフォーカスサ
ーボ波巻　例えは第６図と同様にコリメートレンズ７を
アクチュエータ１２でフォーカス誤差信号で駆動する方
法で容易に行えも　また　トラック１６のトラッキング
も第６図のリニアモータ１７をディテクタ１１のトラッ
キング誤差信号で駆動することで行う。Reference numeral 19 denotes a floating optical head that narrows the collimated light 13 supplied from an external laser light source (not shown) and focuses it on the recording layer 24 of the optical disc 1 to record, re-propagate or rewrite the signal. Corresponds to movable optical part 5 in Figure 6 & 2
0 is a total reflection prism that reflects the collimated light 13 almost at right angles; 21 is an aperture lens; 22 is a slider made of ceramic or the like that floats the aperture lens 21 and the total reflection prism 20 onto the recording layer 24 via a gas layer; 23 is a glass or Disc base material made of ceramic or A1 alloy base material,
24 is a recording layer on which tracks 16 are formed and records and reproduces signals; 25 is a thin protection layer Ji that protects the recording layer 24 from wear and damage caused by humidity and unexpected contact with the slider 22;
Reference numeral 26 denotes a C8S region @ 27, which the slider 22 of the floating optical head 19 comes in contact with when starting and stopping floating, is a recording and reproducing region where the floating optical head 19 flies to record and reproduce signals, and is configured as described above. The operation of the optical information recording and reproducing apparatus will be explained in detail below. When the motor 2 is stopped, the floating optical head 19 descends to the C8S area 26 provided on the inner circumference of the optical disc 1. When the rotation speed of the optical disk 1 reaches a predetermined speed, the slider 22 floats due to gas pressure, and the floating optical head 19 is transferred to the recording area 27 by a linear motor, but the laser light source is turned on and the fixed optical The collimated light 13 from the optical disc 1 is reflected by the total reflection prism 20 and focused almost perpendicularly onto the recording layer 24 of the optical disc 1 by the aperture lens 21. optical disc 1
peripheral speed, shape of slider 22, and floating optical head 19
A floats through the protective layer 25 and the gas layer at a floating height determined by the mass of a.For example, to a floating light of about 1 gram, lid 19
Then the rotation speed is 1. A slider 22 with an area of about 1 cm at 80 rpm can obtain a flying height of several μm to 10 μm, and there is a difference of about several μm between the innermost and outermost peripheries. For example, this can be easily done by driving the collimating lens 7 using the actuator 12 using the focus error signal as shown in FIG. Do by doing.

モータ２を停止するとき１上　浮上式光ヘッド１９をＣ
８Ｓ領域２６に移送した徽　レーザ光源をオフしたの板
　モータ２に停止を指令すａ　回転数が低下すると、ス
ライダー２２がＣ８Ｓ領域２６にコンタクトし停止すａ スライダー２２　Ｇ；Ｌ　　硬くて軽いという条件から
磁気ディスクのフライイングヘッドに使用されているＭ
ｎＺｎフェライトが使用で畝　摺動時にディスク基材が
摩耗しないためｉ、Ｃ５Ｓ領域２６は硬質ガラス基材や
セラミック基材が適当で、記録薄膜は摺動時に摩耗して
微細な粒子として雰囲気中を浮遊するので窒化法　硫化
塩　セレン化物から成る保護層を形成して摩耗を防止し
ていもスライダー２２の保護層２５からの浮上高さは数
μｍと非常に小さいので、　レンズ作動距離ＷＤを非常
に短くでき、絞りレンズ２１のサイズを非常に小さくで
き４　更へ　スライダー２２は光ディスクｌの保護層２
５に沿って浮上し　絞りレンズ２１の光軸が保護層２５
はぼ垂直となって、□光ディスク１の傾きの影響を受け
にくいので、この点からも絞りレンズ２１のＮＡを大き
くできも以上のよう凶　本実施例によれば浮上式光ヘッ
ド１９を記録層２５に気体層を介して浮上さすことで絞
りレンズ２１のフォーカスずれ量を従来の数１０分の−
に抑えて、絞りレンズ２１を微動することによってフォ
ーカス制御が可能で小型・軽量の光ヘッドが構成できも 第１図では　光情報記録再生装置として当然必要な公知
のトラッキング機棟　浮上光ヘッドの検索機檄　信号載
録再生回路などが省略されている力交　これら機能が必
要なことはいうまでもな１．％第２図ｇｅｌ　　本発明
に適用される光ディスクの第１の実施例の平面図であも
　第２図において、Ｃ８Ｓ領域２６は　トラック１６を
プリフォーマットして記録層２４と保護層２５とを形成
した記録領域２７の内周部に設けてあも 記録層２４は　アモルファス相と結晶相との間で相変化
を生じるＧｅ−３ｂ−Ｔｅをベースとする相変化記録薄
膜が蒸着され　保護層２５にはレーザ光に対して光学的
に透明であること、摩耗しにくいことなどが望まれ　窒
化法　硫化塩　セレン化物およびこれらの混合物薄膜が
蒸着されａまｔ＝ｃｓｓ領域２６には　光ディスクの回
転開始時あるいは停止時にスライダー２２がこの面に接
触するた取　摩擦を低減するために潤滑材を塗布するこ
とがおこなわれも　しかし　潤滑材ζ上一般に油性であ
るから記録領域２７に拡散すると、薄い薄膜が形成され
　レーザ光を多重反射して干Ｂを生ま　記録層２４に集
光された光ビームの強度変化　あるいは記録層２４から
の反射光強度に変動を生じも 第３図は　上記濶滑層の課題を解決する本発明に適用さ
れる光ディスクの第２の実施例の構成図であも 図において、記録領域２７とＣ８Ｓ領域２６の境界に同
心円で所定の深さに掘られた隔離溝２８が形成されてい
、ｂ　　ｃｓｓ領域２６の表面には浮上式光ヘッド１９
のスライダー２２がコンタクトするときの摩擦を減らす
目的で濶滑層２９が形成されていも　隔離溝２８ζよ　
一種のバリアーとして濶滑層２９に形成された潤滑材が
記録領域２７へ拡散するのを防止すも 隔離溝２８ｇ友　トラック１６のプリフォーマット作業
時にレーザ光を照射して、溝幅の広い同心円トラックを
形成して作られも　また　公知のＩＣ技術を使用してデ
ィスク基材２３をエツチングして形成することもできも 第４図（友　本発明に適用される光ディスクの第３の実
施例の構成図であも　第３図の隔離溝２８を複数個形成
した隔離溝３０を有Ｌ　　Ｃ８Ｓ領域２６の濶滑層２９
の潤滑材の記録領域２７への拡散防止能力を一層高めて
いも　第３＠　或いは第４図のよう！二　Ｃ８Ｓ領域２
６と記録領域２７の境界部に隔離溝２９．３０を設ける
ことでＣ８Ｓ領域２６に濶滑層２９として塗布した潤滑
材の記録領域２７への拡散を防止でき、潤滑材が記録領
域２６０表面に拡散して、薄い油膜となって、記録層２
４へのレーザ光の集光特性や光干渉特性への悪影響を防
止できも 第５図（よ　光ディスクと浮上式光ヘッドとを複数積層
して気密ボックスに収納した光情報記録再生装置の第２
の実施例の構成図であも 第５図において、　３１は５枚の光ディスク１を積層し
たスタック構造の記録媒体の例であも　光ディスク１の
厚さζヨ０，５〜２ｒｎｒｒＫ　　各光ディスク１の間
隔は３〜５ｍｍ程度に選ぶことができも　いわゆるハー
フハイド（４２ｍｍ）と呼ばれる装置の中に４枚から１
０枚程嵐　フルハイド（８４ｒｎｍ）と呼ばれる装置の
場合には　８枚〜２０枚程度の光ディスクを収容でき、
装置としての容量が１０倍以上に一気に向上すも　３２
は気密ボックスであって、記録媒体３１の周囲環境の影
像　例えばゴミ、塊風　　湿気などの影響から隔離すム
　気密ボックス３２　ｊ；Ｌ　　外気と完全に遮断し　
窒秦　アルゴン等の希ガスを充填することもできるし　
フィルターを通じて清浄な空気を循環させることもでき
、フィルターの目の大きさを適当に選べ＆瓜　外気から
の湿気の侵入をほとんど遮断できａ　すなわ板　気密ボ
ックス３２：友　記録媒体３１の記録層２４の湿度劣化
　酸イＫ　或いはゴミによる記録パワーマージン低下な
どが緩和され　媒体の設計の自由度の拡大と記録媒体の
寿命を大幅にのばす効果があも また　以上で示した実施例１よ　本発明の説明に必要な
最低限の構成要素を示したに過ぎず、光ディスクドライ
ブ装置を構成するのに必要な公知の手段が必要に応じて
使用されることは当然であム発明の詳細 な説明したように本発明によれば　絞りレンズを装着し
たスライダーを光ディスクのＣ８Ｓ領域に接触して浮上
間は　停止を行うことによって、記録層にスライダーを
接触させることなく、記録層上に光ディスクの面振れに
ほぼ無関係にスライダーを浮上させることができ、絞り
レンズのフォーカス可動距離を抑え　小型・高ＮＡの絞
りレンズの使用と、小型・軽量の光ヘッドを実現でき、
トラックアクセスの高速化・記録層のスタック構造化に
よる大容量のメモリ装置を実現できるなど、その実用的
効果は太き（〜When stopping the motor 2, move the floating optical head 19 to C.
The plate transferred to the 8S area 26 The plate with the laser light source turned off Commands the motor 2 to stop a When the rotation speed decreases, the slider 22 contacts the C8S area 26 and stops a Slider 22 G;L Conditions of being hard and light M used in flying heads of magnetic disks from
Since nZn ferrite is used, the disk base material does not wear out during sliding, so a hard glass base material or ceramic base material is suitable for the C5S region 26, and the recording thin film wears away during sliding and is released into the atmosphere as fine particles. Even if a protective layer made of sulfide, salt, and selenide is formed to prevent wear, the flying height of the slider 22 from the protective layer 25 is very small, a few μm, so the lens working distance WD must be set very low. The slider 22 can be shortened, and the size of the aperture lens 21 can be made very small.
5, the optical axis of the aperture lens 21 is aligned with the protective layer 25.
□Since the optical disk 1 is almost vertical, it is less susceptible to the influence of the tilt of the optical disk 1. From this point of view as well, the NA of the aperture lens 21 can be increased. By floating the lens 25 through a gas layer, the amount of defocus of the aperture lens 21 can be reduced to several tens of times compared to conventional methods.
Although it is possible to control the focus by slightly moving the aperture lens 21 and construct a small and lightweight optical head, Fig. 1 shows a well-known tracking machine building that is naturally necessary for an optical information recording and reproducing device. Machine power exchange in which the signal recording/reproducing circuit etc. are omitted It goes without saying that these functions are necessary. Figure 2 is a plan view of the first embodiment of the optical disc applied to the present invention. The recording layer 24 is formed on the inner periphery of the recording area 27 in which a phase change recording thin film based on Ge-3b-Te, which undergoes a phase change between an amorphous phase and a crystalline phase, is deposited on the protective layer 25. is desired to be optically transparent to laser light and resistant to abrasion.Nitriding method A thin film of sulfide, selenide, and a mixture thereof is deposited in the amat=css region 26 at the start of rotation of the optical disk. Alternatively, a lubricant may be applied to reduce the friction when the slider 22 contacts this surface when stopped. However, since the lubricant is generally oil-based, when it spreads into the recording area 27, a thin film is formed. If the laser beam is reflected multiple times and causes drying B, the intensity of the light beam focused on the recording layer 24 or the intensity of the reflected light from the recording layer 24 may change. In the configuration diagram of the second embodiment of the optical disc applied to the present invention, an isolation groove 28 is formed concentrically at the boundary between the recording area 27 and the C8S area 26 to a predetermined depth. A floating optical head 19 is mounted on the surface of the b css area 26.
Even if the sliding layer 29 is formed to reduce friction when the slider 22 makes contact with the isolation groove 28ζ,
The isolation groove 28g serves as a kind of barrier to prevent the lubricant formed on the sliding layer 29 from diffusing into the recording area 27.During preformatting of the track 16, a laser beam is irradiated to form concentric circular tracks with a wide groove width. It can also be formed by etching the disc base material 23 using known IC technology. Even in the figure, there is an isolation groove 30 formed with a plurality of isolation grooves 28 shown in FIG.
Even if the ability to prevent the lubricant from diffusing into the recording area 27 is further enhanced, it will not be possible as shown in Figure 3 or Figure 4! 2 C8S area 2
By providing the isolation grooves 29 and 30 at the boundary between the C8S area 26 and the recording area 27, it is possible to prevent the lubricant applied to the C8S area 26 as the slipping layer 29 from diffusing into the recording area 27, and to prevent the lubricant from spreading to the recording area 260 surface. It diffuses and becomes a thin oil film, forming the recording layer 2.
However, it is possible to prevent the adverse effects on the focusing characteristics and optical interference characteristics of the laser beam on the laser beam.
In FIG. 5, which is a configuration diagram of an embodiment, 31 is an example of a recording medium having a stacked structure in which five optical disks 1 are stacked. The spacing can be selected from 3 to 5 mm, but a so-called half-hide (42 mm) device has 4 to 1 sheets.
In the case of a device called Arashi Full Hide (84rnm), it can accommodate about 8 to 20 optical discs.
The capacity of the device increased by more than 10 times at once. 32
is an airtight box that isolates the recording medium 31 from the effects of the surrounding environment, such as dust, lumps, wind, and humidity.
Nitrogen: It is also possible to fill with a rare gas such as argon.
It is also possible to circulate clean air through the filter, and by selecting an appropriate mesh size for the filter, it is possible to block most of the moisture from entering from the outside air. Embodiment 1 of the present invention has the effect of alleviating the deterioration of the recording power margin due to humidity deterioration, acid K, or dust, expanding the degree of freedom in media design, and greatly extending the life of the recording medium. Only the minimum components necessary for the explanation have been shown, and it is natural that known means necessary for configuring an optical disk drive device may be used as necessary. According to the present invention, a slider equipped with an aperture lens is brought into contact with the C8S area of the optical disk and stopped during the floating period, so that almost all surface runout of the optical disk can be applied onto the recording layer without the slider coming into contact with the recording layer. The slider can be floated independently, the focus movement distance of the aperture lens can be suppressed, the use of a small, high NA aperture lens, and a small and lightweight optical head can be realized.
Its practical effects are significant, such as the ability to realize large-capacity memory devices by speeding up track access and creating a stacked structure for recording layers.

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

第１図は本発明の第１の実施例における光情報記録再生
装置の構成図　第２図は本発明に適用される光ディスク
の第１の実施例の平面医　第３図は本発明多こ適用され
る光ディスクの第２の実施例の構成図　第４図は本発明
に適用される光ディスク第３の実施例の構成＠　第５図
は光ディスクと浮上式光ヘッドとを複数積層して気密ボ
ックスに収納した光情報記録再生装置の第２の実施例の
構成医　第６図は従来の光記録装置の構成図であも１・
・・光ディス久　２・・・モー久　３・・・回転ａ４・
・・固定光学区　５・・・可動光学区　６・・・レーザ
、７・・・コリメートレンＸ　８・・・偏光ビームスブ
リッ久９・・・λ／４＆１０・・・シリンドリカルレン
Ｘｌｌ・・・フォトデイチク久　１２・・・アクチュエ
ー久１３・・・コリメートＬ１４・・・全反射ミラー、
　１５・・・絞りレンＸ　　１６・・・トラッ久　１７
・・・リニアモー久　１８・・・レー／ｋ１９・・・浮
上式光ヘッド、２０・・・全反射ブリズベ　２１・・・
絞りレンＸ　　２２・・・スライダー、２３・・・ディ
スク基材、２４・・・記録凰２５・・・保護Ｎ、　２６
・・・Ｃ８Ｓ領Ｊｔ　　２７・・・記録再生類Ｊｔ　　
２８、３０・・・隔離法　２９・・・潤滑！　３１・・
・スタック構造の記録媒恢　３２・・・気密ボックス。 代理人の氏名　弁理士　粟野重孝　はか１名囮 区 嘘 憾 ３回転軸FIG. 1 is a block diagram of an optical information recording/reproducing apparatus according to a first embodiment of the present invention. FIG. 2 is a planar diagram of an optical disc according to a first embodiment of the present invention. FIG. Fig. 4 is a configuration diagram of a second embodiment of an optical disc applied to the present invention @ Fig. 5 is a configuration diagram of a third embodiment of an optical disc to which the present invention is applied Fig. 6 is a block diagram of a conventional optical recording apparatus.
・・Optical Disk 2...Mokyu 3...Rotation A4・
...Fixed optical zone 5...Movable optical zone 6...Laser, 7...Collimating lens Ku 12... Actuator Ku 13... Collimator L14... Total reflection mirror,
15...Aperture lens X 16...Trakku 17
...Linear Mokyu 18...Reh/k19...Flying optical head, 20...Total reflection Blisbe 21...
Aperture lens
...C8S area Jt 27...Recording and playback type Jt
28, 30... Isolation method 29... Lubrication! 31...
・Stack structure recording medium 32...Airtight box. Name of agent: Patent attorney Shigetaka Awano, 1 person, 3 rotating shafts

Claims (4)

【特許請求の範囲】[Claims] （１）レーザ光線の照射によって検出可能な複数の状態
間を可逆的または非可逆的に変化する記録薄膜を単板デ
ィスク基板の外周部に形成した領域１と、前記記録薄膜
表面にさらに必要に応じて形成した光学的に透明で高々
数百ミクロンメートルの厚さの保護層を有し、前記単板
ディスク基板の内周部に記録薄膜を形成しない領域２と
を具備した記録媒体と、前記記録媒体を回転させるため
の駆動手段と、前記記録媒体の両面にそれぞれ近接して
配置され、前記記録媒体の回転にともない周囲の気体の
抵抗によって所定の距離を保ちつつ浮上し、前記記録媒
体の各記録薄膜上に情報に応じた記録及び、各記録薄膜
上の情報に応じた再生を行う光ヘッドとを備え、前記光
ヘッドは前記記録媒体の回転の開始及び停止時に前記領
域２に位置するようにした光情報記録再生装置。(1) Region 1 in which a recording thin film that changes reversibly or irreversibly between a plurality of states that can be detected by laser beam irradiation is formed on the outer periphery of a single disk substrate; a recording medium having an optically transparent protective layer formed according to the method and having a thickness of at most several hundred micrometers, and a region 2 in which no recording thin film is formed on the inner circumference of the single disk substrate; A driving means for rotating the recording medium is arranged close to both sides of the recording medium, and as the recording medium rotates, it floats while maintaining a predetermined distance due to the resistance of the surrounding gas, and the driving means for rotating the recording medium. An optical head is provided for recording information in accordance with the information on each recording thin film and reproducing information in accordance with the information on each recording thin film, and the optical head is located in the area 2 when the rotation of the recording medium starts and stops. An optical information recording/reproducing device. （２）レーザ光線の照射によって検出可能な複数の状態
間を可逆的または非可逆的に変化する記録薄膜を単板デ
ィスク基板の外周部に形成した領域１と、前記記録薄膜
表面にさらに必要に応じて形成した光学的に透明で高々
数百ミクロンメートルの厚さの保護層を有し、前記単板
ディスク基板の内周部に記録薄膜を形成しない領域２を
具備した単板ディスク基板を複数枚積層した積層記録媒
体と、前記記録媒体を回転させるための手段手段と、前
記記録媒体の両面にそれぞれ近接して配置され、前記記
録媒体の回転にともない周囲の気体の抵抗によって所定
の距離を保ちつつ浮上し、前記記録媒体の各記録薄膜上
に情報に応じた記録及び、各記録薄膜上の情報に応じた
再生を行う光ヘッドとを、外部環境の変化から隔離する
ための気密ボックス中に備え、前記光ヘッドは前記記録
媒体の回転の開始及び停止時に前記領域２に位置するよ
うにした光情報記録再生装置。(2) Region 1 in which a recording thin film that changes reversibly or irreversibly between a plurality of states that can be detected by laser beam irradiation is formed on the outer periphery of a single disk substrate, and further areas 1 are formed on the surface of the recording thin film. A plurality of single disk substrates each having an optically transparent protective layer formed according to the above-mentioned method and having a thickness of at most several hundred micrometers, and having a region 2 in which no recording thin film is formed on the inner periphery of the single disk substrate. A stacked recording medium, a means for rotating the recording medium, and a means for rotating the recording medium are disposed close to each other on both sides of the recording medium. inside an airtight box for isolating an optical head that floats up while maintaining its position and records information on each recording thin film of the recording medium and reproduces information on each recording thin film from changes in the external environment. In preparation for this, the optical information recording and reproducing apparatus is arranged such that the optical head is located in the area 2 when the rotation of the recording medium starts and stops. （３）領域２は光ディスク基材であって、光ヘッドを浮
上せしめるスライダー材質よりも硬いことを特徴とする
請求項１または２記載の光情報記録再生装置。(3) The optical information recording and reproducing apparatus according to claim 1 or 2, wherein the region 2 is an optical disc base material and is harder than the slider material that makes the optical head fly. （４）記録媒体に領域２を光ヘッドが摺動するときの摩
擦を低減する濶滑層を設け、領域１と前記領域２との境
界部に少なくとも一つの溝部を形成したことを特徴とす
る請求項１、２または３記載の光情報記録再生装置。(4) A sliding layer is provided on the recording medium to reduce friction when the optical head slides in area 2, and at least one groove is formed at the boundary between area 1 and area 2. An optical information recording/reproducing apparatus according to claim 1, 2, or 3.