JPH10228661A - Master disk manufacturing aligner for optical recording medium - Google Patents

Master disk manufacturing aligner for optical recording medium

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Publication number
JPH10228661A
JPH10228661A JP9030565A JP3056597A JPH10228661A JP H10228661 A JPH10228661 A JP H10228661A JP 9030565 A JP9030565 A JP 9030565A JP 3056597 A JP3056597 A JP 3056597A JP H10228661 A JPH10228661 A JP H10228661A
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Prior art keywords
substrate
objective lens
transparent
photoresist layer
recording medium
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JP9030565A
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Japanese (ja)
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JP3612920B2 (en
Inventor
Kotaro Kurokawa
光太郎 黒川
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Sony Corp
ソニー株式会社
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Priority to JP03056597A priority Critical patent/JP3612920B2/en
Publication of JPH10228661A publication Critical patent/JPH10228661A/en
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Publication of JP3612920B2 publication Critical patent/JP3612920B2/en
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Abstract

PROBLEM TO BE SOLVED: To enhance exposing accuracy of the master disk of an optical recording medium.
SOLUTION: A liquid tight and fixed transparent shield plate 21 is provided between an objective lens 14 for exposure light and a photoresist layer 16, and 1st and 2nd transparent liquids 31 and 32 having light transmissibility of the exposure light are filled into between the objective lens 14 and the fixed transparent shield plate 21 and then the fixed transparent shield plate 21 and a substrate coated with the photoresist layer 16 respectively. Consequently, the 2nd transparent liquid is prohibited from flowing to the objective lens 14, while the 1st transparent liquid in contact with the objective lens does not flow (move) in spite of rotating of the substrate, so that an axial drift, etc., of the objective lens 14 does not take place.
COPYRIGHT: (C)1998,JPO

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、光学記録媒体の原盤作製用露光装置に係わる。 BACKGROUND OF THE INVENTION The present invention relates to a master-disk producing exposure apparatus of the optical recording medium.

【0002】 [0002]

【従来の技術】オーディオ用、ビデオ用、その他の各種情報を記録するコンパクトディスク(CD)や、レーザーディスク(LD)等の従来の光学記録媒体においては、その情報記録層にデータ情報、トラッキングサーボ信号等の記録がなされる位相ピット、プリグルーブ等の微細凹凸の形成がなされる。 BACKGROUND ART Audio, video, other and a compact disc (CD) for recording a variety of information, in the conventional optical recording medium of a laser disk (LD), etc., data information on the information recording layer, a tracking servo phase pits recorded signals and the like are made, the formation of fine irregularities such as pre-groove is made.

【0003】この情報記録層を構成する微細凹凸は、光学記録媒体の基板の射出成形と同時に形成したり、あるいは、フォトポリマリゼーション法、いわゆる2P法等によって形成されたりすることができる。 [0003] fine irregularities constituting the information recording layer, may be formed simultaneously with the injection molding of the substrate of the optical recording medium, or can be or is formed by the photo poly Mali internalization process, the so-called 2P method.

【0004】これらの射出成形あるいは2P法においては、最終的に形成する微細凹凸を転写形成する微細凹凸を有するスタンパーが用いられる。 [0004] In these injection molding or the 2P method, a stamper having a fine concavo-convex forming transferring a fine unevenness finally formed is used. このスタンパーの作製においては、先ず、原盤の作製がなされる。 In the production of the stamper, first, preparation of the master is made. この原盤はこれを構成する基板、例えば研磨した平滑なガラス板上にフォトレジストを塗布し、これをパターン露光して、微細凹凸を形成し、その表面に例えばAgメッキを施して成る。 The master disk substrate constituting this, a photoresist is applied to, for example, polished smooth glass plate, which was pattern exposure to form fine irregularities, and on its surface for example by subjecting the Ag plating. このようにして作製した原盤にメタルメッキを施し、これを剥離することによって、あるいはこの繰り返しによってスタンパーの形成がなされる。 Such subjected to metal plating on the master prepared by the, by peeling it, or formation of the stamper is made by this repetition.

【0005】図4にその概略構成を示すように、この原盤作製に際してのフォトレジストに対するパターン露光を行う原盤露光装置50は、フォトレジストの感光する波長の露光用レーザービームLを発生する露光レーザービーム発生源51と、露光パターン例えば記録情報に応じて露光用レーザービームLを変調する変調器52とが設けられ、これにより例えば強度変調された露光用レーザービームLを、ミラー53により反射させて、対物レンズ54に向かわせ、この対物レンズ54を通じて原盤を作製する基板55上のフォトレジスト56面に露光用レーザービームLを集束するようにして、微細な記録パターンの記録を行う。 [0005] As shown the schematic configuration in FIG. 4, master exposure apparatus 50 performing pattern exposure on the photoresist during the master making, the exposure laser beam for generating exposure laser beam L on the photosensitive wavelength of the photoresist a source 51, an exposure pattern for example, a recording information and modulator 52 for modulating the exposure laser beam L is provided in accordance with which, for example, by an intensity-modulated exposure laser beam L, it is reflected by the mirror 53, It directs the objective lens 54, so as to focus the exposure laser beam L on the photoresist 56 surface of the substrate 55 to produce a master through the objective lens 54, to record fine recording patterns. この従来における原盤露光装置においては、対物レンズ54と基板55上のフォトレジスト56との間は、図5に示すように単なる空間、すなわち空気が介在された構成とされている。 In this master exposure apparatus in the prior art, between the photoresist 56 on the objective lens 54 and the substrate 55, a mere space, as shown in FIG. 5, that is, air is the configurations interposed.

【0006】一方、昨今、光学記録媒体の高記録密度化が進み、原盤の露光においても、より微細な位置制御、 On the other hand, recently, progress in recording density of the optical recording medium, even in exposure of the original disk, finer position control,
すなわち露光用レーザービームLのスポットの微小化が要求されている。 That miniaturization of the spot of the exposure laser beam L is required.

【0007】このように、露光用レーザービームLのスポットの微小化、すなわち集光力の向上を図るために、 [0007] Thus, miniaturization of the spot of the exposure laser beam L, that in order to improve the light-gathering power,
図6に示すように、対物レンズ54と、フォトレジスト56との間を高屈折率の媒体、例えば液体で満たした状態で露光を行う液浸法、いわゆる油浸法が提案されている。 As shown in FIG. 6, an objective lens 54, the liquid immersion method performs a high refractive index of the medium between the photoresist 56, the exposure in a state filled with for example a liquid, the so-called oil-immersion method has been proposed.

【0008】この図6において、露光用レーザービームLと、フォトレジスト面56の鉛直線とのなす角をθとし、対物レンズ54の開口数をN. [0008] In FIG. 6, the exposure laser beam L, and the angle between the vertical line of the photo-resist surface 56 and theta, the numerical aperture of the objective lens 54 N. A. A. とし、対物レンズ54と、フォトレジスト56との間の媒体の屈折率をnとすると、フォトレジスト56面上に集光される露光用レーザービームLの径φは、露光用レーザービームL And then, the objective lens 54 and the refractive index of the medium between the photoresist 56 is n, the diameter φ of the exposure laser beam L is focused onto the photoresist 56 surface, the exposure laser beam L
の波長をλとするとき、下記(数1)により表される。 When the wavelength of the lambda, represented by the following equation (1).

【0009】 [0009]

【数1】φ=(0.82×λ)/N. [Number 1] φ = (0.82 × λ) / N. A. A. (但しN.A.=n×sinθとする。) (However, the N.A. = n × sinθ.)

【0010】すなわち、対物レンズ54と、フォトレジスト56との間の媒体として、その屈折率nが、空気の屈折率(n 0 =1)よりも大きいものを適用すれば、対物レンズ54の開口数N. [0010] That is, an objective lens 54, as a medium between the photoresist 56 and the refractive index n, by applying the larger than the refractive index of air (n 0 = 1), the opening of the objective lens 54 number N. A. A. が大きくなり、その結果、φ(ビームLの径)の値を小さくすることができ、 Increases. As a result, it is possible to reduce the value of phi (diameter of the beam L),
露光用レーザービームLの集光力の向上を図ることができるのである。 It is possible to improve the light-gathering power of the exposure laser beam L.

【0011】 [0011]

【発明が解決しようとする課題】一方、上述したように、フォトレジストの露光用レーザービームLによる露光を行う場合には、対物レンズ54と、基板55とを、 [SUMMARY OF THE INVENTION Meanwhile, as described above, when performing exposure by the exposure laser beam L of the photoresist, an objective lens 54, and a substrate 55,
相対的に移動させる必要がある。 It is necessary to relatively move. 例えば、円盤状の基板55を用いた場合においては、基板55を回転しつつ、 For example, in the case of using the disk-shaped substrate 55, while rotating the substrate 55,
露光用レーザービームLを基板55の半径方向に移動させて、フォトレジスト面上にスパイラル状にレーザービームスポットを走査させる。 The exposure laser beam L is moved in the radial direction of the substrate 55, to scan the laser beam spot in a spiral form on the photoresist surface.

【0012】しかしながら、上述した液浸法を用いてフォトレジストの露光を行う場合において、対物レンズ5 [0012] However, in the case of performing the exposure of the photoresist with the liquid immersion method as described above, the objective lens 5
4と、基板55とを、相対的に移動させると、対物レンズ54と、フォトレジスト56との間の高屈折率の液体が、基板55の移動、例えば回転に引きずられて動く。 4, the substrate 55, when the relative movement, an objective lens 54, the liquid of high refractive index between the photoresist 56, movement of the substrate 55 moves example is dragged in rotation.
このとき、対物レンズ54がこの高屈折率の液体の動きに逆らうように存在していることから、液体の動きによって対物レンズ54に軸ぶれや、オートフォーカス動作の乱れ等、対物レンズの動作に影響が生じることになる。 At this time, since the objective lens 54 exists as against the movement of the liquid in the high refractive index, and axis vibration the objective lens 54 by the movement of the liquid, turbulence, etc. of the autofocus operation, the operation of the objective lens impact will be occur.

【0013】このように対物レンズ54の軸ぶれ等が生じた状態で、フォトレジストの露光を行うと、最終的に得られる光学記録媒体はトラックピッチむらや再生信号の変調度のむら等、粗悪な信号特性を有するものとなる。 [0013] In a state where the axial vibration or the like occurs in this way the objective lens 54, when the exposure of the photoresist, the unevenness of the degree of modulation of the final optical recording medium obtained has a track pitch unevenness and reproduction signal or the like, coarse It comes to have a signal characteristic.

【0014】そこで、本発明においては、液浸法を用いてフォトレジストの露光を行う場合において、露光用レーザービームLの集光力の向上を図り、かつ対物レンズ54の軸ぶれや、オートフォーカス動作の乱れを回避した光学記録媒体の原盤作製用露光装置を提供する。 [0014] Therefore, in the present invention, when performing the exposure of the photoresist with the liquid immersion method, aims to improve the light-gathering power of the exposure laser beam L, and and shaft wobble of the objective lens 54, autofocus providing master manufacturing exposure apparatus of an optical recording medium that avoids disturbance of the operation.

【0015】 [0015]

【課題を解決するための手段】本発明による光学記録媒体の原盤作製用露光装置は、フォトレジスト層が塗布された基板の支持部と、露光光の対物レンズと、対物レンズと、フォトレジスト層が塗布された基板との間に配置され、液密性を有する固定透明遮蔽板とを有し、対物レンズまたは基板の支持部の少なくとも一方に、対物レンズを通過して上記フォトレジスト層に到来する露光スポットを、フォトレジスト層において移行走査させる相対的移行手段を具備し、対物レンズと固定透明遮蔽板との間、および固定透明遮蔽板とフォトレジスト層が塗布された基板との間とに、それぞれ露光光に対して光透過性を有する第1および第2の透明液体が充填された構成とする。 Master fabrication exposure apparatus of an optical recording medium according to the present invention SUMMARY OF] includes a supporting portion of the substrate where the photoresist layer is applied, and the objective lens of the exposure light, an objective lens, a photoresist layer There is disposed between the substrate coated, and a fixed transparent shield plate having a liquid-tight, at least one of the support portions of the objective lens or the substrate, arriving on the photoresist layer through the objective lens the exposure spots, comprising the relative migration means for shifting the scanning in the photoresist layer, between the fixed transparent shield plate and the objective lens, and a fixed transparent shield plate and between the substrate where the photoresist layer is applied , first and second transparent liquid, each having a light transmitting property against exposing light is a configuration that is filled.

【0016】上述の本発明構成によれば、露光の際にフォトレジスト層が塗布された基板の回転に合わせて流れる第2の透明液体と対物レンズとの間に、固定透明遮蔽板を設けたため、第2の透明液体の流れを対物レンズに伝えないようにすることができ、対物レンズが接している第1の透明液体は、基板が回転するにもかかわらず、 According to the present invention the above-mentioned configuration, while the photoresist layer during exposure of the second transparent liquid and the objective lens that flows in accordance with the rotation of the substrate coated, due to the provision of a fixed transparent shield , the flow of the second transparent liquid can prevent convey the objective lens, a first transparent liquid objective lens is in contact with the substrate despite the rotation,
流れ(動き)を生じることがないので、対物レンズ54 Since there is no cause flow (motion), the objective lens 54
の軸ぶれ等を生じることなく、液浸法の実現、すなわち露光用レーザービームLの集光力の向上を図った光学記録媒体の原盤作製用露光装置を実現することができる。 Without causing axial vibration or the like, realization of the immersion method, that can realize the master-disk producing an exposure apparatus for an optical recording medium with improved light-gathering power of the exposure laser beam L.

【0017】 [0017]

【発明の実施の形態】本発明の具体的な実施の形態について説明する。 DETAILED DESCRIPTION OF THE INVENTION Specific embodiments of the present invention will be described. 以下において、ディスク状、いわゆる円盤状の光ディスクを作製する場合に、射出成形法、あるいは2P法による使用するスタンパーを転写して作製するガラス基板上のフォトレジスト面のパターン露光に適用する場合について説明するが、本発明における原盤作製用露光装置は、この形状に限定されるものではなく、 In the following, a disk-shaped, in the case of manufacturing a so-called disk-shaped optical disc, when applied to injection molding, or pattern exposure of the photoresist surface of the glass substrate manufactured by transferring a stamper to be used by the 2P method description Suruga, master fabrication exposure apparatus in the present invention is not limited to this shape,
光磁気ディスク、相変化ディスク、その他カード状、シート状等の、微細凹凸を情報記録層に有する各種光学記録媒体の作製に用いる原盤を露光する場合に適用することができる。 Magneto-optical disks, phase change disks, and other card-like, sheet-like, etc., can be applied to a case of exposing a master for use in the production of various optical recording medium having fine unevenness on the information recording layer.

【0018】本発明の一実施例を説明する。 [0018] illustrating an embodiment of the present invention. 図1に本発明の原盤作製用露光装置の概略構成図を、図2に本発明の原盤作製用露光装置における露光機構の概略断面図を示す。 The schematic diagram of the master fabrication exposure apparatus of the present invention in FIG. 1 shows a schematic cross-sectional view of an exposure mechanism of the master fabrication exposure apparatus of the present invention in FIG.

【0019】本発明の原盤作製用露光装置10においては、図1に示すように、露光用レーザービームLを発生する露光レーザービーム発生源11と、露光パターン例えば記録情報に応じて露光用レーザービームLを変調する変調器12とが設けられ、これにより例えば強度変調された露光用レーザービームLを、ミラー13により反射させて、図1中の破線で囲まれた露光機構100において、露光がなされる。 [0019] In the master fabrication exposure apparatus 10 of the present invention, as shown in FIG. 1, the exposure laser beam source 11 for generating the exposure laser beam L, the exposure laser beam in accordance with the exposure pattern for example, a recording information a modulator 12 is provided for modulating the L, thereby the exposure laser beam L for example intensity modulated, is reflected by the mirror 13, the exposure mechanism 100 surrounded by a broken line in FIG. 1, the exposure is made that.

【0020】ここで、露光機構100は、露光レーザービームLを集光する対物レンズ14、フォトレジスト1 [0020] Here, exposure mechanism 100, an objective lens 14 for condensing the exposure laser beam L, photoresist 1
6が塗布された基板15と、基板15を支持する支持部20と、対物レンズ14と基板15との間に配置された液密性を有する固定透明遮蔽板21とからなり、対物レンズ14の集光側の面と固定透明遮蔽板21との間には、第1の透明液体31が充填され、固定透明遮蔽板2 A substrate 15 6 is applied, a support portion 20 for supporting a substrate 15, made of a fixed transparent shield plate 21 and having the placed liquid tightness between the objective lens 14 and the substrate 15, the objective lens 14 between the surface and the fixed transparent shield plate 21 of the condensing side, a first transparent liquid 31 is filled, the fixed transparent shield 2
1とフォトレジスト層16が塗布された基板15との間には、第2の透明液体32が充填されている構成を有するものである。 Between the 1 and the substrate 15 with the photoresist layer 16 is applied, a second transparent liquid 32 and has a configuration that is filled.

【0021】本発明の原盤作製用露光装置10における上記露光機構100の概略構成図を図2に示す。 [0021] The schematic diagram of the exposure mechanism 100 in the master fabrication exposure apparatus 10 of the present invention shown in FIG.

【0022】すなわち、図2に示す露光機構100においては、フォトレジストが塗布されたフォトレジスト面16を有する基板15、例えば石英ガラスよりなる基板が、支持部20により支持される。 [0022] That is, in the exposure mechanism 100 shown in FIG. 2, a substrate 15 having a photoresist surface 16 coated with the photoresist, the substrate, for example made of quartz glass, is supported by the support portion 20. この支持部20は、 The support unit 20,
例えば上面に基板15を収容配置する凹部が設けられた円板体よりなり、その中心軸を中心として回転できるように支持され、回転機構17例えばモーターの回転軸に連結されて回転するようになされる。 For example, from the disk body having a recess provided for accommodating placing a substrate 15 on the upper surface, is supported for rotation about its central axis, adapted to rotate is connected to the rotation shaft of the rotation mechanism 17 for example a motor that.

【0023】一方、ミラー13と、露光用レーザービームLを集光する対物レンズ14は、支持部20の半径方向と平行する方向に移動するようになされる。 On the other hand, a mirror 13, an objective lens 14 for condensing the exposure laser beam L is made to move in a direction parallel to the radial direction of the support portion 20. このようにして支持部20による基板15の回転と、ミラー13 And rotation of the substrate 15 by this way support portion 20, a mirror 13
および対物レンズ14の移動との共動によって、フォトレジスト層16において露光用レーザービームLを移行走査する相対的移行手段が構成される。 And by cooperating with the movement of the objective lens 14, the relative migration means for migrating scanning exposure laser beam L in the photoresist layer 16 is formed. これらの対物レンズ14と、基板15とは、露光光に対して屈折率が同等である透明材料によって構成することが望ましい。 These objective lens 14 and the substrate 15, it is desirable to construct a transparent material having a refractive index equivalent to the exposure light.

【0024】固定透明遮蔽板21は、支持部20すなわち基板15の回転に影響されずに静止状態を保持する構成となっている。 The fixed transparent shield plate 21 is configured to hold a stationary state without being influenced by the rotation of the support portion 20 or substrate 15. 図示の例では、この固定透明遮蔽板2 In the illustrated example, the fixed transparent shield 2
1上に円筒状側壁101が液密に配置されてこの固定透明遮蔽板21と側壁101によって第1の透明液体31 Cylindrical side wall 101 on 1 is arranged in a liquid-tight by the stationary transparent shield plate 21 and the side wall 101 first transparent liquid 31
が収容される。 There are housed.

【0025】対物レンズ14と固定透明遮蔽板21との間に、この第1の透明液体31が充填される。 [0025] between the objective lens 14 and the fixed transparent shield plate 21, the first transparent liquid 31 is filled. また、固定透明遮蔽板21とフォトレジスト層16が塗布された基板15との間には、第2の透明液体32が充填されている。 Further, between the fixed transparent shield plate 21 and the photoresist layer 16 is a substrate 15 which is coated, a second transparent liquid 32 is filled. これらの第1および第2の透明液体31および3 These first and second transparent liquid 31 and 3
2は、それぞれ露光光に対して光透過性を有するものとする。 2 shall each have a light transmitting property against exposing light.

【0026】固定透明遮蔽板21は、例えば石英ガラスによって構成することができるが、この固定透明遮蔽板21は、対物レンズ14と屈折率が同等ないしは近い透明基板によって構成する。 [0026] Fixed transparent shield plate 21 can be constituted by, for example, quartz glass, the fixed transparent shield plate 21, the objective lens 14 and the refractive index is formed by equal or nearly transparent substrate. この第1の透明液体31および第2の透明液体32は、これらの屈折率が空気の屈折率よりも対物レンズ14の屈折率に近いもので、さらに基板15、固定透明遮蔽板21のそれぞれの屈折率と同等である液体、例えばベンゼンを使用することができる。 The first transparent liquid 31 and the second transparent liquid 32, these refractive index is close to the refractive index of the objective lens 14 than the refractive index of air, further substrate 15, the respective fixed transparent shield plate 21 liquid is equivalent to the refractive index, for example, benzene can be used.

【0027】また、フォトレジスト層16の露光を行う場合に基板の支持部20を回転機構17により回転させた際に、第2の透明液体32が原盤作製用露光装置10 Further, when rotated by a rotating mechanism 17 to support 20 of the substrate when performing exposure of the photoresist layer 16, a second transparent liquid 32 is master fabrication exposure apparatus 10
の外側に飛散しないようにガード機構22が設けられている。 Guard mechanism 22 is provided so as not to scatter to the outside. また、第2の透明液体32は、固定透明遮蔽板2 The second transparent liquid 32 is fixed transparent shield 2
1と基板15との間に充填されると共に、その水面が固定透明遮蔽板21の露光に関与しない円筒状側壁101 While being filled between the 1 and the substrate 15, a cylindrical side wall 101 that water is not involved in the exposure of the fixed transparent shield plate 21
外の周辺部において、固定透明遮蔽板21の上部に回り込むように充填されている。 In the outer peripheral portion, it is filled in such a way as to wrap around the top of the fixed transparent shield plate 21.

【0028】また、第2の透明液体32が基板15の側面を回り込み、フォトレジスト層16側に入り込むことを回避するため、基板15とガード機構22との間には、例えばOリング23を配置する。 Further, since the second transparent liquid 32 is to avoid that the wraparound side of the substrate 15, enters the photoresist layer 16 side, between the substrate 15 and the guard mechanism 22, for example, placing the O-ring 23 to.

【0029】上述したような構成を有する原盤作製用露光装置10を用いて、基板15上に塗布されたフォトレジスト16の露光を行う場合について説明する。 [0029] Using the master fabrication exposure apparatus 10 having the above-described configuration, it will be described the case of performing the exposure of the photoresist 16 coated on the substrate 15.

【0030】図1に示した露光レーザービーム発生源1 The exposure shown in FIG. 1 the laser beam source 1
1から露光用レーザービームLを発生させ、所定の露光パターンに応じて、この露光用レーザービームLを変調器12により変調する。 1 to generate the exposure laser beam L from according to a predetermined exposure pattern, it is modulated by a modulator 12 to the exposure laser beam L. そして、変調された露光用レーザービームLは、ミラー13により対物レンズ14に導入されて対物レンズ14により集光されるようにする。 The exposure laser beam L modulated is to be condensed by the objective lens 14 is introduced into the objective lens 14 by the mirror 13.

【0031】図2に示すように、フォトレジスト16が塗布された基板15は、回転機構17により回転する支持部20に設置されて所定の回転数で回転させる。 As shown in FIG. 2, the substrate 15 on which the photoresist 16 is applied is installed in the supporting part 20 which rotates to rotate at a predetermined rotation speed by the rotation mechanism 17. このとき、第1の透明液体31と、第2の透明液体32とは、固定透明遮蔽板21によって遮断されている。 At this time, a first transparent liquid 31, and the second transparent liquid 32, is blocked by the fixed transparent shield plate 21. この固定透明遮蔽板21が基板15の回転に合わせて流れる第2の透明液体の流れを第1の透明液体31に伝えないようにしているため、第1の透明液体31には流れが生じることなく、静止した状態を保つことができる。 Since the fixing transparent shield plate 21 is prevented transmitted to the first transparent liquid 31 flow of the second transparent liquid flowing in accordance with the rotation of the substrate 15, the flow is generated in the first transparent liquid 31 no, it is possible to maintain the stationary state. すなわち、固定透明遮蔽板21によって、第2の透明液体3 That is, by fixing the transparent shielding plate 21, a second transparent liquid 3
2の流れを対物レンズ14に伝わることが回避され、ブレや振動が生じない。 It is avoided from being transmitted second flow to the objective lens 14, no blur and vibration.

【0032】図3に、図2中の長円で囲まれた部分の拡大図を示す。 [0032] FIG 3 shows an enlarged view of the portion surrounded by the ellipse in FIG. この図3に示すように、第2の透明液体3 As shown in FIG. 3, a second transparent liquid 3
2は、固定透明遮蔽板21の周辺上部と下部とで、固定透明遮蔽板の外周部で連通するように配置する。 2, between the peripheral top and bottom of the fixed transparent shield plate 21 is disposed so as to communicate with the outer peripheral portion of the fixed transparent shield. これにより、フォトレジスト層16が塗布された基板15の回転に伴う固定透明遮蔽板21の下部の第2の透明液体3 Thus, the photoresist layer 16 at the bottom of the fixed transparent shield plate 21 caused by the rotation of the substrate 15 which is coated a second transparent liquid 3
2における遠心力による外周方向への移動を、固定透明遮蔽板21の上部に配置された第2の透明液体32によって阻止することができる。 The movement in the outer peripheral direction by the centrifugal force at 2, may be blocked by a second transparent liquid 32 which is placed on the top of the fixed transparent shield plate 21.

【0033】すなわち、基板15が回転すると、図3に示すように、固定透明遮蔽板21とフォトレジスト層1 [0033] That is, when the substrate 15 is rotated, as shown in FIG. 3, the fixed transparent shield plate 21 and the photoresist layer 1
6が塗布された基板15との間に充填された第2の透明液体32は、回転により生じた遠心力によって外周側に引き寄せられ、これによって、固定透明遮蔽板21に撓みが生じ、固定透明遮蔽板21と基板15との間隔に変動を来すとか、固定透明遮蔽板21に破損を生じさせる。 A second transparent liquid 32 6 is filled between the substrate 15 coated are drawn on the outer peripheral side by centrifugal force generated by the rotation, thereby, cause bending the fixed transparent shield plate 21, the fixed transparent Toka causes variations in the distance between the shield plate 21 and the substrate 15, causing damage to the fixed transparent shield plate 21.

【0034】また、固定透明遮蔽板21と、基板15との距離は極めて小に選定されているため、固定透明遮蔽板21と基板15との間の、第2の透明液体32の量が少なくなると、固定透明遮蔽板21と基板15とが略接触した状態となるため、固定透明遮蔽板21が基板15 Further, the fixed transparent shield plate 21, the distance between the substrate 15 is very because it is selected in a small, between the fixed transparent shield plate 21 and the substrate 15, the amount of the second transparent liquid 32 is small comes to, to become fixed transparent shield plate 21 and the state of contacting the substrate 15 Togaryaku, fixed transparent shield plate 21 is a substrate 15
の回転に影響されてしまい、静止した状態を保持できなくなってしまう。 Will be affected by the rotation of, it becomes impossible to retain the stationary state.

【0035】これに対し、上述の本発明構成によれば、 [0035] In contrast, according to the present invention the above-mentioned configuration,
固定透明遮蔽板21よりも上部周辺の第2の透明液体3 Second transparent liquid 3 of the upper periphery than the fixed transparent shield plate 21
2も基板15の回転により生じた遠心力によって外周側に引き寄せられることから、固定透明遮蔽板21よりも上部の第2の透明液体32の液量を調整することによって、上述した固定透明遮蔽板21と基板15との間に充填された第2の透明液体32の遠心力を相殺することができ、外周方向へ移動することを阻止し、固定透明遮蔽板21と基板15との間の、第2の透明液体32の量が少なくなることを回避できる。 2 From be attracted to the outer peripheral side by centrifugal force generated by the rotation of the substrate 15, by adjusting the liquid amount of the second transparent liquid 32 in the upper than the fixed transparent shielding plate 21, the fixed transparent shielding plate mentioned above it is possible to cancel the centrifugal force of the second transparent liquid 32 which is filled between the 21 and the substrate 15, and prevented from moving toward the outer circumference, between the fixed transparent shield plate 21 and the substrate 15, It can be avoided that the amount of the second transparent liquid 32 is reduced.

【0036】上述したように、回転機構17によって基板15を回転させた状態で、入射された露光用レーザービームLは、第1および第2の透明液体31および3 [0036] As described above, while rotating the substrate 15 by the rotating mechanism 17, incident exposure laser beam L, the first and second transparent liquid 31 and 3
2、固定透明遮蔽板21、基板15を介してフォトレジスト16に集光されて、露光がなされ、微細凹凸が形成される。 2, the fixed transparent shield plate 21 is condensed on the photoresist 16 through the substrate 15, the exposure is made, the fine unevenness is formed. その後その表面に例えばAgメッキを施して原盤が作製される。 Then the master is fabricated on the surface for example by subjecting the Ag plating. このようにして作製された原盤にメタルメッキを施し、これを剥離することによって、あるいはこの繰り返しによって、光学記録媒体の微細凹凸を転写するためのスタンパーの形成がなされる。 Such subjected to metal plating on the master disk which is manufactured in, by peeling it, or by the repetition, the formation of a stamper for transferring the fine unevenness of the optical recording medium is performed.

【0037】上述のように、露光光の集光を行う対物レンズと、フォトレジストとの間を第1および第2の透明液体31および32を介してフォトレジストの露光を行うと、これらの屈折率は空気の屈折率よりも大とすることができるので、図6および(数1)において説明したように、露光ビームLのスポット径を小さくすることができる。 [0037] As described above, an objective lens for collecting light of the exposure light, when the exposure of the photoresist through between the photoresist the first and second transparent liquid 31 and 32, these refraction the rate so it can be larger than the refractive index of air, as described with reference to FIG. 6 and Equation 1, it is possible to reduce the spot diameter of the exposure beam L. これにより、より精密な露光制御が可能となる。 This enables more precise exposure control. 上述した実施例においては、第1および第2の透明液体31および32として、ベンゼンを使用しており、 In the above embodiment, as the first and second transparent liquid 31 and 32, are used benzene,
このベンゼンの屈折率は1.5である。 The refractive index of the benzene is 1.5. よって、(数1)より、露光ビームLの径を空気を介して露光した場合に比べて1/1.5になる。 Therefore, from equation (1) becomes 1 / 1.5 as compared with the case where the diameter of the exposure beam L is exposed to light via the air. すなわち、光学記録媒体の情報記録密度の観点では、線密度を1.5倍、面密度を2.25倍にすることができる。 That is, in the aspect of the information recording density of the optical recording medium, 1.5 linear density, the surface density can be 2.25 times.

【0038】また、特に本発明においては、フォトレジスト層16が塗布された基板15の回転によって流れが生じてしまう第2の透明液体32と、対物レンズ14との間に、第2の透明液体32の流れを対物レンズ14に伝えない効果を有する固定透明遮蔽板21を設けたため、対物レンズ14が接している第1の透明液体31 Further, particularly in the present invention, a second transparent liquid 32 which occurs the flow by rotation of the substrate 15 on which the photoresist layer 16 is applied, between the objective lens 14, a second transparent liquid because 32 of the flow provided fixed transparent shield plate 21 which has the effect of not convey the objective lens 14, a first transparent liquid objective lens 14 is in contact with 31
は、基板15や対物レンズ14の相対的な移動にもかかわらず、流れが生じないので、対物レンズ14の軸ぶれ等を生じることなく、安定して確実に所定のパターンをもって、所定の位置への露光を行うことができる。 Despite relative movement of the substrate 15 and the objective lens 14, since no flow occurs, without causing axial vibration of the objective lens 14 or the like, to ensure stable with a predetermined pattern, to a predetermined position it is possible to perform the exposure of.

【0039】上述した実施例においては、第1の透明液体31、第2の透明液体32として、同一のもの、すなわちベンゼンを用いた場合について説明したが、本発明この例に限定されることなく、これらの透明液体が、露光光に対して光透過性を有し、かつ等しい屈折率を有するものであれば、異なる液体を使用することができる。 [0039] In the embodiment described above, the first transparent liquid 31, a second transparent liquid 32, the same thing, namely has been described with benzene, without being limited present invention to this example these clear liquid has a light transmitting property against exposing light, and as long as it has a refractive index equal, it is possible to use different liquids.

【0040】上述した実施例においては、フォトレジスト層16を塗布した15を、フォトレジスト層を塗布した側が対物レンズ14と対向する側とは反対側になるように配置されて、第2の透明液体32と接触しないようになされている場合について説明したが、本発明はこの例に限定されることなく、基板15をそのフォトレジスト層16が対物レンズ14と対向する側になるように配置されて、第2の透明液体32と接するようになされた構成とすることもできる。 [0040] In the embodiment described above, the 15 coated with a photoresist layer 16, the side was coated with a photoresist layer is arranged so as to be opposite to the side facing the objective lens 14, the second transparent has been described that is adapted so as not to contact with the liquid 32, the present invention is not limited to this example, the photoresist layer 16 is arranged such that on the side facing the objective lens 14 to the substrate 15 Te may be configured has been made in contact with the second transparent liquid 32. 但し、この場合においては、 However, in this case,
フォトレジスト層16と直接接触する第2の透明液体3 Second transparent liquid 3 in direct contact with the photoresist layer 16
2は、フォトレジスト16に対して不溶性のものを使用することが必要である。 2, it is necessary to use those insoluble to the photoresist 16. このように、フォトレジスト層16を対物レンズ14と対向するように基板15を設置した場合、フォトレジスト層16と、対物レンズ14を上述の実施例よりも近接した状態で露光をすることができるため、より微細なパターンの露光が可能となる。 Thus, when the substrate was placed 15 so as to face the photoresist layer 16 of the objective lens 14, a photoresist layer 16 can be exposed in close proximity than in the embodiment described above the objective lens 14 Therefore, it is possible to exposure of finer pattern.

【0041】 [0041]

【発明の効果】本発明によれば、光学記録媒体用の原盤作製用露光装置において、液浸法を採り入れたことにより、露光用レーザービームLの集光力の向上を図ることができた。 According to the present invention, the master-disk producing exposure apparatus for optical recording medium, by incorporating the liquid immersion method, it was possible to improve the light-gathering power of the exposure laser beam L. また、基板と、対物レンズとの間に固定透明遮蔽板を設けたことによって、液浸法によるにもかかわらず、基板の回転による第1の液体の流れを、対物レンズに伝えないようすることができ、対物レンズの軸ぶれや、オートフォーカス動作の乱れを効果的に回避することができた。 Further, a substrate, by providing the fixed transparent shield plate between the objective lens, even though by immersion method, the first flow of liquid by rotation of the substrate, to prevent transmitted to the objective lens It can be, and shaft wobble of the objective lens, it was possible to effectively avoid the disturbance of the autofocus operation.

【0042】また、フォトレジスト層16を対物レンズ14と対向するように基板15を設置し、フォトレジストが第2の透明液体32と接触するようになされた構成とすることにより、フォトレジスト層16と、対物レンズ14との距離をより近接した状態として露光をすることができるため、より微細なパターンの露光が可能となった。 Further, by a photoresist layer 16 is placed a substrate 15 so as to face the objective lens 14, a configuration which the photoresist is made in contact with the second transparent liquid 32, a photoresist layer 16 When, it is possible to exposure in a state where closer the distance between the objective lens 14, has enabled the exposure of finer pattern.

【0043】また、本発明は、第2の透明液体32を、 [0043] Further, the present invention is that the second transparent liquid 32,
固定透明遮蔽板21の上部と下部とで、固定透明遮蔽板の外周部で連通するようにし、この固定透明遮蔽板21 In the upper and lower portions of the fixed transparent shielding plate 21, so as to communicate with the outer peripheral portion of the fixed transparent shielding plates, the fixed transparent shield plate 21
の上部の第2の透明液体32の量を調節することにより、フォトレジスト層16が塗布された基板15の回転に伴う固定透明遮蔽板21の下部の第2の透明液体32 Second by adjusting the amount of the transparent liquid 32, a second transparent liquid at the bottom of the fixed transparent shield plate 21 caused by the rotation of the substrate 15 with the photoresist layer 16 is coated 32 at the top of
における遠心力による外周方向への移動を、固定透明遮蔽板21の上部の第2の透明液体32の基板の回転により生じた遠心力によって阻止することができ、固定透明遮蔽板21と基板15との間の、第2の透明液体32の量が少なくなることを回避できた。 In the movement of the outer peripheral direction by the centrifugal force, it can be prevented by the centrifugal force generated by the rotation of the substrate of the second transparent liquid 32 in the upper portion of the fixed transparent shield plate 21, and the fixed transparent shield plate 21 and the substrate 15 between, and prevents the amount of the second transparent liquid 32 is reduced.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明における原盤露光装置の概略構成図を示す。 It shows a schematic diagram of a master exposure apparatus in the present invention; FIG.

【図2】本発明における原盤露光装置の要部の概略構成図を示す。 It shows a schematic diagram of a main part of the master exposure apparatus in the present invention; FIG.

【図3】本発明における原盤露光装置の要部の概略構成図を示す。 It shows a schematic diagram of a main part of the master exposure apparatus in the present invention; FIG.

【図4】従来における原盤露光装置の概略構成図を示す。 Figure 4 shows a schematic diagram of a master exposure apparatus in the prior art.

【図5】従来における原盤露光装置の要部の概略構成図を示す。 Figure 5 shows a schematic diagram of a main part of the master exposure apparatus in the prior art.

【図6】液浸法を用いた場合に従来における原盤露光装置の要部の概略構成図を示す。 Figure 6 shows a schematic diagram of a main part of the master exposure apparatus in the prior art in the case of using the liquid immersion method.

【符号の説明】 DESCRIPTION OF SYMBOLS

10,50 原盤露光装置、11,51 露光レーザービーム発生源、12,52 変調器、13,53 ミラー、14,54 対物レンズ、15,55 基板、1 10,50 master exposure apparatus, 11, 51 exposure laser beam source, 12 and 52 the modulator, 13 and 53 mirrors, 14 and 54 an objective lens, 15, 55 substrate, 1
6,56 フォトレジスト、17 回転機構、20 基板の支持部、21固定透明遮蔽板、22 ガード機構、 6, 56 photoresist 17 rotating mechanism 20 the supporting portion of the substrate, 21 fixed transparent shielding plate, 22 a guard mechanism,
23 Oリング、100 原盤露光装置の露光機構、1 23 O-ring, the exposure mechanism 100 master exposure device, 1
01 円筒状側壁 01 cylindrical side wall

Claims (9)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 光学記録媒体の微細凹凸を形成する光学記録媒体の原盤作製用露光装置において、 フォトレジスト層が塗布された基板の支持部と、 露光光の対物レンズと、 該対物レンズと、上記フォトレジスト層が塗布された基板との間に配置され、液密性を有する固定透明遮蔽板とを有し、 上記対物レンズまたは上記基板の支持部の少なくとも一方に、上記対物レンズを通過して上記フォトレジスト層に到来する露光スポットを、上記フォトレジスト層において移行走査させる相対的移行手段を具備し、 上記対物レンズと上記固定透明遮蔽板との間、および上記固定透明遮蔽板と上記フォトレジスト層が塗布された基板との間とに、それぞれ上記露光光に対して光透過性を有する第1および第2の透明液体が充填されたことを特徴とする 1. A master-disk producing an exposure apparatus for an optical recording medium to form fine unevenness of the optical recording medium, a supporting portion of the substrate where the photoresist layer is applied, and the objective lens of the exposure light, and the objective lens, the photoresist layer is disposed between the substrate coated, and a fixed transparent shield plate having a liquid-tight, at least one of the support portions of the objective lens or the substrate, passes through the objective lens the exposure spot arriving on the photoresist layer Te, provided the relative migration means for shifting the scanning in the photoresist layer, between the objective lens and the fixed transparent shield plate, and the fixed transparent shielding plates and the photo and between the substrate on which the resist layer has been applied, the first and second transparent liquid, each having a light transmitting property with respect to the exposure light, characterized in that the filled 学記録媒体の原盤作製用露光装置。 Master fabrication exposure apparatus Manabu recording medium.
  2. 【請求項2】 上記基板の支持部が、上記基板をその面内で回転させる回転支持体よりなることを特徴とする請求項1に記載の光学記録媒体の原盤作製用露光装置。 2. A supporting portion of the substrate, master-disk producing an exposure apparatus for an optical recording medium according to claim 1, characterized in that consists of a rotary support for rotating the substrate in its plane.
  3. 【請求項3】 上記第1および第2の透明液体は、その屈折率が、空気の屈折率に比し上記対物レンズの屈折率に近い屈折率を有する液体であることを特徴とする請求項1に記載の光学記録媒体の原盤作製用露光装置。 Wherein said first and second transparent liquid, claims a refractive index, characterized in that it is a liquid having a refractive index close to the refractive index of the objective lens relative to the refractive index of air master fabrication exposure apparatus of an optical recording medium according to 1.
  4. 【請求項4】 上記第1および第2の透明液体と、上記フォトレジスト層が塗布された基板と、上記固定透明遮蔽板とは、それらの屈折率が上記露光光に対して同等であることを特徴とする請求項1に記載の光学記録媒体の原盤作製用露光装置。 4. A said first and second transparent liquid, and the substrate on which the photoresist layer has been applied, the above fixed transparent shield plate, that their refractive index is equal to said exposure light master fabrication exposure apparatus of an optical recording medium according to claim 1, wherein the.
  5. 【請求項5】 上記第1および第2の透明液体は、同一の透明液体よりなることを特徴とする請求項1に記載の光学記録媒体の原盤作製用露光装置。 Wherein said first and second transparent liquid master fabrication exposure apparatus of an optical recording medium according to claim 1, characterized in that consists of the same transparent liquid.
  6. 【請求項6】 上記フォトレジスト層が塗布された基板は、上記露光光に対して光透過性を有する基板より構成され、 上記フォトレジスト層が、上記対物レンズと対向する側とは反対側に配置されて上記第2の透明液体と接触しないようになされていることを特徴とする請求項1に記載の光学記録媒体の原盤作製用露光装置。 6. A substrate on which the photoresist layer has been applied is composed of a substrate having optical transparency with respect to the exposure light, the photoresist layer is, on the side opposite to the side where it is opposed to the objective lens disposed in the master fabrication exposure apparatus of an optical recording medium according to claim 1, characterized in that it is made so as not to contact with the second transparent liquid.
  7. 【請求項7】 上記フォトレジスト層が塗布された基板と上記対物レンズとは、屈折率が上記露光光に対して同等である透明材料によって構成されたことを特徴とする請求項1に記載の光学記録媒体の原盤作製用露光装置。 The method according to claim 7 substrate the photoresist layer is applied and the objective lens, a refractive index according to claim 1, characterized in that it is constituted by a transparent material that is equivalent to said exposure light master fabrication exposure apparatus of the optical recording medium.
  8. 【請求項8】 上記フォトレジスト層が塗布された基板は、そのフォトレジスト層が、上記対物レンズと対向する側に配置されて上記第2の透明液体と接触するようになされ、 上記第2の透明液体は、上記フォトレジスト層が可溶性を示さない透明液体よりなることを特徴とする請求項1 8. The substrate on which the photoresist layer has been applied, the photoresist layer is disposed on the side facing the objective lens is made to be in contact with the second transparent liquid, the second transparent liquid claim 1, characterized in that the photoresist layer is made of a transparent liquid exhibiting no soluble
    に記載の光学記録媒体の原盤作製用露光装置。 Master fabrication exposure apparatus of an optical recording medium according to.
  9. 【請求項9】 上記第2の透明液体は、上記固定透明遮蔽板の上部と下部とで、上記固定透明遮蔽板の外周部で連通するように配置されて、 上記フォトレジスト層が塗布された基板の回転に伴う固定透明遮蔽板の下部の第2の透明液体における遠心力による外周方向への移動を、固定透明遮蔽板の上部の第2 9. The second transparent liquid, between the upper part and the lower part of the fixed transparent shield plate is disposed so as to communicate with the outer peripheral portion of the fixed transparent shielding plate, the photoresist layer is applied the movement in the outer peripheral direction by the centrifugal force in a second transparent liquid at the bottom of the fixed transparent shield plate due to the rotation of the substrate, the top of the fixed transparent shield 2
    の透明液体によって阻止する構成としたことを特徴とする請求項2に記載の光学記録媒体の原盤作製用露光装置。 Master fabrication exposure apparatus of an optical recording medium according to claim 2, characterized in that a configuration be blocked by the transparent liquid.
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