JP6703078B2 - Film forming apparatus and method for manufacturing organic EL display device using the same - Google Patents

Film forming apparatus and method for manufacturing organic EL display device using the same Download PDF

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JP6703078B2
JP6703078B2 JP2018200151A JP2018200151A JP6703078B2 JP 6703078 B2 JP6703078 B2 JP 6703078B2 JP 2018200151 A JP2018200151 A JP 2018200151A JP 2018200151 A JP2018200151 A JP 2018200151A JP 6703078 B2 JP6703078 B2 JP 6703078B2
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substrate
supporting
electrostatic chuck
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石井 博
石井  博
一史 柏倉
一史 柏倉
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Canon Tokki Corp
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    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/50Substrate holders
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    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/04Coating on selected surface areas, e.g. using masks
    • C23C14/042Coating on selected surface areas, e.g. using masks using masks
    • CCHEMISTRY; METALLURGY
    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/12Organic material
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    • C23COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23CCOATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/24Vacuum evaporation
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/677Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations
    • H01L21/67739Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for conveying, e.g. between different workstations into and out of processing chamber
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/67Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
    • H01L21/683Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping
    • H01L21/6831Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere for supporting or gripping using electrostatic chucks
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • H10K71/10Deposition of organic active material
    • H10K71/16Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering
    • H10K71/166Deposition of organic active material using physical vapour deposition [PVD], e.g. vacuum deposition or sputtering using selective deposition, e.g. using a mask

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Description

本発明は成膜装置に関するもので、特に、静電チャックに基板を平らに付着させるための基板支持部に関するものである。 The present invention relates to a film forming apparatus, and more particularly to a substrate supporting unit for flatly attaching a substrate to an electrostatic chuck.

最近、フラットパネル表示装置として有機EL表示装置が脚光を浴びている。有機EL表示装置は自発光ディスプレイであり、応答速度、視野角、薄型化などの特性が液晶パネルディスプレイより優れており、モニタ、テレビ、スマートフォンに代表される各種携帯端末などで既存の液晶パネルディスプレイを早いスピードで代替している。また、自動車用ディスプレイ等にも、その応用分野を広げている。 Recently, organic EL display devices have been spotlighted as flat panel display devices. The organic EL display device is a self-luminous display, and has characteristics such as response speed, viewing angle, and thinness that are superior to liquid crystal panel displays. Existing liquid crystal panel displays for monitors, televisions, various types of mobile terminals represented by smartphones, etc. Is being replaced at a fast speed. The field of application is also expanding to automobile displays.

有機EL表示装置の素子は、2つの向かい合う電極(カソード電極、アノード電極)の間に発光を起こす有機物層が形成された基本構造を持つ。有機EL表示装置の素子の有機物層及び電極層は、成膜装置の真空チャンバーの下部に設けられた蒸着源を加熱することで蒸発された蒸着材料を画素パターンが形成されたマスクを介して真空チャンバー上部に置かれた基板(の下面)に蒸着させることで形成される。 The element of the organic EL display device has a basic structure in which an organic material layer that emits light is formed between two electrodes (cathode electrode, anode electrode) facing each other. The organic material layer and the electrode layer of the element of the organic EL display device are vacuumed through a mask on which a pixel pattern is formed by vaporizing a vapor deposition material that is vaporized by heating a vapor deposition source provided under a vacuum chamber of a film forming device. It is formed by vapor deposition on (the lower surface of) the substrate placed on the upper part of the chamber.

このような上向蒸着方式の成膜装置の真空チャンバー内において、基板は基板ホルダによって保持されるが、基板(の下面)に形成された有機物層/電極層に損傷を与えないように基板の下面の周縁を基板ホルダの支持部によって支持する。この場合、基板のサイズが大きくなるにつれて、基板ホルダの支持部によって支持されない基板の中央部が基板の自重によって撓み、蒸着精度を落とす要因となっている。 Although the substrate is held by the substrate holder in the vacuum chamber of such an upward deposition type film forming apparatus, the substrate is held so as not to damage the organic layer/electrode layer formed on (the lower surface of) the substrate. The peripheral edge of the lower surface is supported by the supporting portion of the substrate holder. In this case, as the size of the substrate increases, the central portion of the substrate, which is not supported by the supporting portion of the substrate holder, bends due to the weight of the substrate, which causes a decrease in vapor deposition accuracy.

基板の自重による撓みを低減するための方法として静電チャックを使う技術が検討されている。すなわち、基板の上部に静電チャックを設け、基板ホルダの支持部によって支持された基板の上面を静電チャックで吸着させることで、基板の中央部が静電チャックの静電引力によって引っ張られるようになり、基板の撓みを低減することができる。 A technique using an electrostatic chuck is being studied as a method for reducing the deflection of the substrate due to its own weight. That is, by providing an electrostatic chuck on the upper part of the substrate and adsorbing the upper surface of the substrate supported by the support part of the substrate holder by the electrostatic chuck, the central part of the substrate is pulled by the electrostatic attractive force of the electrostatic chuck. Therefore, the bending of the substrate can be reduced.

しかし、従来の基板ホルダの支持部を構成する支持部材は、その基板支持面が同じ高さになるように設けられ、このような支持部上に置かれた基板は自重によって基板の中央部が撓むので、基板ホルダの支持部によって支持された基板は基板の周縁部が基板の中央部より静電チャックに近い状態で支持される。この状態で、平板形状の静電チャックを基板に向けて下降させれば、基板ホルダの支持部によって支持された基板の周縁部がほぼ同時に静電チャックから静電引力を受けて静電チャックに吸着され、基板の中央部は一番遅く静電引力を受けるようになる。 However, the supporting member that constitutes the supporting portion of the conventional substrate holder is provided so that the substrate supporting surface is at the same height, and the substrate placed on such a supporting portion has a central portion of the substrate due to its own weight. Since the substrate is bent, the substrate supported by the support portion of the substrate holder is supported in a state where the peripheral portion of the substrate is closer to the electrostatic chuck than the central portion of the substrate. In this state, if the flat plate-shaped electrostatic chuck is lowered toward the substrate, the peripheral edge of the substrate supported by the supporting portion of the substrate holder receives an electrostatic attractive force from the electrostatic chuck almost at the same time to become the electrostatic chuck. After being adsorbed, the central part of the substrate receives the electrostatic attraction most slowly.

すなわち、基板の静電チャックへの吸着が基板の周縁部から基板の中央部に向かって進むので、静電チャックと基板が充分に近くなっても基板が平らに静電チャックに吸着されるのではなく基板の中央部に基板と静電チャックとの隙間が残ってしまう。すなわち、従来の成膜装置においては、静電チャックを使っても基板の中央部と静電チャックとの隙間が依然として残り、基板を充分に平らに保持することができない問題がある。また、基板の下面の周縁部が基板ホルダの支持部によって一番強い支持力で支持されるので、すなわち、静電引力が一番強く作用するので、一番遅く静電チャックの静電引力を受けるようになる基板の中央部の撓みを基板の周縁部に向かって充分に伸ばすことができず、しわが残るようになる。 That is, since the attraction of the substrate to the electrostatic chuck progresses from the peripheral portion of the substrate toward the central portion of the substrate, the substrate is evenly attracted to the electrostatic chuck even when the electrostatic chuck and the substrate are sufficiently close to each other. Instead, a gap between the substrate and the electrostatic chuck remains in the center of the substrate. That is, in the conventional film forming apparatus, even if an electrostatic chuck is used, the gap between the central portion of the substrate and the electrostatic chuck still remains, and there is a problem that the substrate cannot be held sufficiently flat. Further, since the peripheral portion of the lower surface of the substrate is supported by the supporting portion of the substrate holder with the strongest supporting force, that is, the electrostatic attractive force acts the strongest, the electrostatic attractive force of the electrostatic chuck is the slowest. The bending of the central portion of the substrate to be received cannot be sufficiently extended toward the peripheral portion of the substrate, and wrinkles are left.

本発明は、基板を静電チャックにより平らな形状で吸着できる成膜装置及びこのような成膜装置を用いて電子デバイスを製造する方法を提供することを目的とする。 An object of the present invention is to provide a film forming apparatus capable of adsorbing a substrate in a flat shape by an electrostatic chuck and a method for manufacturing an electronic device using such a film forming apparatus.

本発明の一態様による成膜装置は、マスクを介して基板に成膜を行うための成膜装置であって、前記基板の周縁部を支持するための支持部を含む基板保持ユニットと、前記支持部の上方に設けられ、前記基板を吸着するための静電チャックとを含み、前記支持部は第1方向に沿って配置される複数の第1支持部材と、複数の第1支持部材と対向するように前記第1方向に沿って配置される複数の第2支持部材と、前記第1方向と交差する第2方向に沿って配置される複数の第3支持部材と、前記複数の第3支持部材と対向するように前記第2方向に沿って配置される複数の第4支持部材とを含み、前記第1支持部材の基板支持面及び前記第3支持部材の基板支持面の高さは前記第2支持部材の基板支持面及び前記第4支持部材の基板支持面の高さより高い。
A film forming apparatus according to an aspect of the present invention is a film forming apparatus for forming a film on a substrate through a mask, comprising: a substrate holding unit including a supporting portion for supporting a peripheral portion of the substrate; An electrostatic chuck for adsorbing the substrate, the electrostatic chuck being provided above the supporting portion; the supporting portion having a plurality of first supporting members arranged along a first direction; and a plurality of first supporting members. A plurality of second supporting members arranged along the first direction so as to face each other; a plurality of third supporting members arranged along a second direction intersecting the first direction; And a plurality of fourth support members arranged along the second direction so as to face the third support member, and the height of the substrate support surface of the first support member and the substrate support surface of the third support member. Is higher than the height of the substrate support surface of the second support member and the substrate support surface of the fourth support member.

本発明の他の一態様による有機EL表示装置の製造方法は、本発明の一態様による成膜装置内に基板を搬入して前記基板保持ユニットの前記支持部に前記基板を置く工程と、前記静電チャックにて、前記基板保持ユニットの前記支持部上に置かれた前記基板の上面を吸着する工程と、前記マスクを介して前記基板に蒸着材料を堆積させる成膜工程と、蒸着材料が成膜された前記基板を前記成膜装置から搬出する工程とを含み、前記静電チャックにて前記基板の上面を吸着する前記工程では、前記基板の対向する二つの辺の中のいずれかの一つの辺に沿った基板周縁部が他の一つの辺に沿った基板周縁部より先に前記静電チャックに吸着される。 A method of manufacturing an organic EL display device according to another aspect of the present invention includes a step of loading the substrate into the film forming apparatus according to the one aspect of the present invention and placing the substrate on the support portion of the substrate holding unit, An electrostatic chuck is used to adsorb the upper surface of the substrate placed on the supporting portion of the substrate holding unit, a film forming step of depositing an evaporation material on the substrate through the mask, and an evaporation material. In the step of adsorbing the upper surface of the substrate by the electrostatic chuck, the step of unloading the substrate on which the film has been formed from the film forming apparatus is performed. The peripheral edge of the substrate along one side is attracted to the electrostatic chuck before the peripheral edge of the substrate along another side.

本発明の他の一態様による有機EL表示装置の製造方法は、本発明の一態様による成膜装置内に基板を搬入して前記基板保持ユニットの前記支持部に前記基板を置く工程と、前記静電チャックにて、前記基板保持ユニットの前記支持部上に置かれた前記基板の上面を吸着する工程と、前記マスクを介して前記基板に蒸着材料を堆積させる成膜工程と、蒸着材料が成膜された前記基板を前記成膜装置から搬出する工程とを含み、前記静電チャックにて前記基板の上面を吸着する前記工程では、前記基板の対角線上の一角側の周縁部が反対側の角の周縁部より先に前記静電チャックに吸着される。 A method of manufacturing an organic EL display device according to another aspect of the present invention includes a step of loading the substrate into the film forming apparatus according to the one aspect of the present invention and placing the substrate on the support portion of the substrate holding unit, An electrostatic chuck is used to adsorb the upper surface of the substrate placed on the supporting portion of the substrate holding unit, a film forming step of depositing an evaporation material on the substrate through the mask, and an evaporation material. In the step of adsorbing the upper surface of the substrate by the electrostatic chuck, the peripheral edge portion on one diagonal side of the substrate is opposite to the opposite side. Is adsorbed to the electrostatic chuck before the peripheral edge of the corner.

本発明によれば、基板の下面の周縁部を支持するための基板保持ユニットの支持部材が互い異なる高さの基板支持面を持つように設置されることで、基板保持ユニットの支持部材によって支持された基板が静電チャックに吸着される時、基板の対向する二辺が同時に静電チャックに吸着されるのではなく、基板の対向する二辺の中で基板支持面の高い支持部材によって支持される辺側が静電チャックに先に吸着された後、他の辺側に向かって基板が順次に静電チャックに吸着される。これによって、基板の中央部の撓みを基板の周縁部の他の辺側に向かって伸ばすことができ、基板の中央部でも基板と静電チャックが間隙なく密着されるようになり、全体的に基板が静電チャックに平らにしわ無く密着されるようになる。 According to the present invention, the supporting members of the substrate holding unit for supporting the peripheral portion of the lower surface of the substrate are installed so as to have the substrate supporting surfaces of different heights, so that the supporting members of the substrate holding unit support the supporting members. When the processed substrate is attracted to the electrostatic chuck, the two opposite sides of the substrate are not attracted to the electrostatic chuck at the same time, but are supported by the supporting member having a high substrate supporting surface in the two opposite sides of the substrate. The side to be processed is first attracted to the electrostatic chuck, and then the substrates are sequentially attracted to the electrostatic chuck toward the other side. As a result, the bending of the central portion of the substrate can be extended toward the other side of the peripheral portion of the substrate, and the substrate and the electrostatic chuck can be adhered to each other without a gap even in the central portion of the substrate. The substrate becomes flat and wrinkle-free adhered to the electrostatic chuck.

図1は有機EL表示装置の製造ラインの一部の模式図である。FIG. 1 is a schematic view of a part of a manufacturing line of an organic EL display device. 図2は本発明の一実施形態による成膜装置の模式図である。FIG. 2 is a schematic diagram of a film forming apparatus according to an embodiment of the present invention. 図3は本発明の一実施形態による成膜装置に使われる基板保持ユニットの支持部を示す模式図である。FIG. 3 is a schematic view showing a support portion of the substrate holding unit used in the film forming apparatus according to the embodiment of the present invention. 図4は本発明の他の実施形態による成膜装置に使われる基板保持ユニットの支持部を示す模式図である。FIG. 4 is a schematic view showing a supporting portion of a substrate holding unit used in a film forming apparatus according to another embodiment of the present invention. 図5は本発明の他の実施形態による基板保持ユニットの支持部の構成を示す模式図である。FIG. 5 is a schematic view showing the structure of the support portion of the substrate holding unit according to another embodiment of the present invention. 図6は有機EL表示装置の構造を示す模式図である。FIG. 6 is a schematic view showing the structure of the organic EL display device.

以下、図面を参照しつつ本発明の好適な実施形態を説明する。ただし、以下の実施形態は本発明の好ましい構成を例示的に示すものにすぎず、本発明の範囲はそれらの構成に限定されない。また、以下の説明における、装置のハードウェア構成及びソフトウェア構成、処理フロー、製造条件、寸法、材質、形状などは、特に特定的な記載がないかぎりは、本発明の範囲をそれらのみに限定する趣旨のものではない。 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. However, the following embodiments merely exemplify preferable configurations of the present invention, and the scope of the present invention is not limited to those configurations. Further, in the following description, the hardware configuration and software configuration of the apparatus, the processing flow, the manufacturing conditions, the dimensions, the material, the shape, etc., unless otherwise specified, limit the scope of the present invention to them. It isn't meant.

本発明は、基板の表面に真空蒸着によってパターンの薄膜(材料層)を形成する装置に望ましく適用することができる。基板の材料としては、硝子、高分子材料のフィルム、金属などの任意の材料を選択することができ、また、蒸着材料としても、有機材料、金属性材料(金属、金属酸化物など)などの任意の材料を選択することができる。本発明の技術は、具体的には、有機電子デバイス(例えば、有機EL表示装置、薄膜太陽電池)、光学部材などの製造装置に適用可能である。その中でも、有機EL表示装置の製造装置は、蒸着材料を蒸発させて有機EL表示素子を形成するものであり、本発明の望ましい適用例の一つである。 INDUSTRIAL APPLICABILITY The present invention can be preferably applied to an apparatus for forming a thin film (material layer) of a pattern on a surface of a substrate by vacuum evaporation. As the material of the substrate, any material such as glass, a film of a polymer material, and metal can be selected, and also as the vapor deposition material, such as organic material and metallic material (metal, metal oxide, etc.), etc. Any material can be selected. The technique of the present invention is specifically applicable to a manufacturing apparatus for an organic electronic device (for example, an organic EL display device, a thin film solar cell), an optical member, and the like. Among them, the manufacturing apparatus of an organic EL display device is one for forming an organic EL display element by evaporating a vapor deposition material, which is one of desirable application examples of the present invention.

<電子デバイス製造ライン>
図1は、電子デバイスの製造ラインの構成の一部を模式的に示す上視図である。図1の製造ラインは、例えば、スマートフォン用の有機EL表示装置の表示パネルの製造に用いられる。スマートフォン用の表示パネルの場合、例えば、約1800mm×約1500mmのサイズの基板に有機ELの成膜を行った後、該基板をダイシングして複数の小サイズのパネルに作製される。
<Electronic device manufacturing line>
FIG. 1 is a top view schematically showing a part of the configuration of the electronic device manufacturing line. The manufacturing line of FIG. 1 is used for manufacturing a display panel of an organic EL display device for a smartphone, for example. In the case of a display panel for a smartphone, for example, an organic EL film is formed on a substrate having a size of about 1800 mm×about 1500 mm, and then the substrate is diced to form a plurality of small-sized panels.

電子デバイスの製造ラインは、一般に、図1に示すように、複数の成膜室11、12と、搬送室13とを有する。搬送室13内には、基板10を保持し搬送する搬送ロボット14が設けられている。搬送ロボット14は、例えば、多関節アームに、基板を保持するロボットハンドが取り付けられた構造をもつロボットであり、各成膜室への基板10の搬入
/搬出を行う。
An electronic device manufacturing line generally has a plurality of film forming chambers 11 and 12 and a transfer chamber 13, as shown in FIG. A transfer robot 14 that holds and transfers the substrate 10 is provided in the transfer chamber 13. The transfer robot 14 is, for example, a robot having a structure in which a robot hand for holding a substrate is attached to an articulated arm, and carries the substrate 10 in and out of each film forming chamber.

各成膜室11、12にはそれぞれ成膜装置(蒸着装置ともよぶ)が設けられている。搬送ロボット14との基板10の受け渡し、基板10とマスクの相対位置の調整(アライメント)、マスク上への基板10の固定、成膜(蒸着)などの一連の成膜プロセスは、成膜装置によって自動で行われる。 Each of the film forming chambers 11 and 12 is provided with a film forming device (also referred to as a vapor deposition device). A series of film forming processes such as transfer of the substrate 10 to and from the transfer robot 14, adjustment of the relative position of the substrate 10 and the mask (alignment), fixing of the substrate 10 on the mask, and film formation (vapor deposition) are performed by the film forming apparatus. It is done automatically.

以下、成膜室の成膜装置の構成に対して説明する。
<成膜装置>
図2は成膜装置2の構成を概略的に示す断面図である。以下の説明においては、鉛直方向をZ方向とするXYZ直交座標系を使う。成膜時に基板が水平面(XY平面)と平行となるように固定された場合、基板の短辺に平行な方向をX方向、長辺に平行な方向をY方向とする。またZ軸周りの回転角をθで表示する。
The configuration of the film forming apparatus in the film forming chamber will be described below.
<Film forming device>
FIG. 2 is a sectional view schematically showing the configuration of the film forming apparatus 2. In the following description, an XYZ orthogonal coordinate system in which the vertical direction is the Z direction will be used. When the substrate is fixed so as to be parallel to the horizontal plane (XY plane) during film formation, the direction parallel to the short side of the substrate is the X direction, and the direction parallel to the long side is the Y direction. Further, the rotation angle around the Z axis is represented by θ.

成膜装置2は、成膜工程が行われる空間を定義する真空チャンバー20を具備する。真空チャンバー20の内部は、真空雰囲気、或いは、窒素ガスなどの不活性ガス雰囲気で維持される。 The film forming apparatus 2 includes a vacuum chamber 20 that defines a space in which a film forming process is performed. The inside of the vacuum chamber 20 is maintained in a vacuum atmosphere or an atmosphere of an inert gas such as nitrogen gas.

成膜装置2の真空チャンバー20内の上部には、基板を保持する基板保持ユニット21、マスクが置かれるマスク台22、基板を静電引力によって吸着させる静電チャック23、金属製のマスクに磁力を印加するためのマグネット24などが設けられ、成膜装置の真空チャンバー20内の下部には、蒸着材料が収納される蒸着源25などが設けられる。 A substrate holding unit 21 for holding a substrate, a mask table 22 on which a mask is placed, an electrostatic chuck 23 for attracting the substrate by electrostatic attraction, and a magnetic force on a metal mask are provided above the vacuum chamber 20 of the film forming apparatus 2. A magnet 24 for applying a vapor deposition source is provided, and a vapor deposition source 25 for containing a vapor deposition material is provided below the vacuum chamber 20 of the film forming apparatus.

基板保持ユニット21は、搬送室13の搬送ロボット14から基板10を受取り、保持及び搬送する。基板保持ユニット21は基板ホルダとも呼ぶ。基板保持ユニット21は基板の下面の周縁部を支持する支持部211,212を含む。支持部上には基板の損傷を防止するためにフッ素コーティングされたパッド(不図示)が設けられる。本発明の実施形態の支持部は、後述するように、基板が静電チャックに全体的に平らに吸着されることができるようにお互いに高さが異なる複数の支持部材を含む。 The substrate holding unit 21 receives, holds and conveys the substrate 10 from the transfer robot 14 in the transfer chamber 13. The substrate holding unit 21 is also called a substrate holder. The substrate holding unit 21 includes supporting portions 211 and 212 that support the peripheral portion of the lower surface of the substrate. A pad (not shown) coated with fluorine is provided on the support to prevent damage to the substrate. As will be described later, the support unit according to the exemplary embodiment of the present invention includes a plurality of support members having different heights so that the substrate can be attracted to the electrostatic chuck evenly.

基板保持ユニット21の下にはフレーム状のマスク台22が設置され、マスク台22には基板10上に形成される薄膜パターンに対応する開口パターンを有するマスク221が置かれる。特に、スマートフォン用の有機EL素子を製造するのに使われるマスクは、微細な開口パターンが形成された金属製のマスクであり、FMM(Fine Metal Mask)とも呼ぶ。 A frame-shaped mask table 22 is installed under the substrate holding unit 21, and a mask 221 having an opening pattern corresponding to the thin film pattern formed on the substrate 10 is placed on the mask table 22. In particular, a mask used for manufacturing an organic EL element for a smartphone is a metal mask having a fine opening pattern formed thereon and is also called an FMM (Fine Metal Mask).

基板保持ユニット21の支持部211,212の上方には、基板を静電引力によって吸着して固定させるための静電チャック23が設けられる。静電チャックは、セラミックス材質のマトリックス内に金属電極などの電気回路が埋め込まれた構造を持ち、金属電極にプラス(+)及びマイナス(−)電圧が印加されれば、セラミックスマトリックスを通じて基板に分極電荷が誘導され、これら間の静電気的な引力によって基板が静電チャック23に吸着固定される。静電チャックは埋め込まれた電気回路の構造によって複数のモジュールに区画されることができる。 Above the supporting portions 211 and 212 of the substrate holding unit 21, an electrostatic chuck 23 for adsorbing and fixing the substrate by electrostatic attraction is provided. The electrostatic chuck has a structure in which an electric circuit such as a metal electrode is embedded in a matrix made of a ceramic material, and when positive (+) and negative (-) voltages are applied to the metal electrode, the substrate is polarized through the ceramic matrix. Electric charges are induced, and the substrate is attracted and fixed to the electrostatic chuck 23 by electrostatic attraction between them. The electrostatic chuck can be divided into a plurality of modules by the structure of the embedded electric circuit.

静電チャック23の上部には、金属製のマスク221に磁力を印加してマスクの撓みを防止し、マスク221と基板10とを密着させるためのマグネット24が設けられる。マグネット24は永久磁石または電磁石からなることができ、複数のモジュールに区画されることができる。 A magnet 24 is provided above the electrostatic chuck 23 to apply magnetic force to the metal mask 221 to prevent the mask from bending and to bring the mask 221 and the substrate 10 into close contact with each other. The magnet 24 may be a permanent magnet or an electromagnet, and may be divided into a plurality of modules.

図2には図示しなかったが、静電チャック23とマグネット24との間には基板を冷却
するための冷却板が設けられる。冷却板はマグネット24と一体に構成することもできる。
蒸着源25は、基板に成膜される蒸着材料が収納されるるつぼ(不図示)、るつぼを加熱するためのヒータ(不図示)、蒸着源からの蒸発レートが一定になるまで蒸着材料が基板に飛散することを阻むシャッタ(不図示)などを含む。蒸着源25は、点(point)蒸着源、線形(linear)蒸着源、リボルバ蒸着源などの用途によって多様な構成を持つことができる。
Although not shown in FIG. 2, a cooling plate for cooling the substrate is provided between the electrostatic chuck 23 and the magnet 24. The cooling plate may be integrated with the magnet 24.
The vapor deposition source 25 includes a crucible (not shown) in which a vapor deposition material to be deposited on the substrate is stored, a heater (not shown) for heating the crucible, and the vapor deposition material is a substrate until the evaporation rate from the vapor deposition source becomes constant. It includes a shutter (not shown) and the like that prevent the particles from scattering. The deposition source 25 may have various configurations such as a point deposition source, a linear deposition source, and a revolver deposition source.

図2に図示しなかったが、成膜装置2は、基板に蒸着された膜の厚さを測定するための膜厚モニタ(不図示)及び膜厚算出ユニット(不図示)を含む。 Although not shown in FIG. 2, the film deposition apparatus 2 includes a film thickness monitor (not shown) and a film thickness calculation unit (not shown) for measuring the thickness of the film deposited on the substrate.

成膜装置2の真空チャンバー20の外部上面には、基板保持ユニット21、静電チャック23、マグネット24などを鉛直方向(Z方向)に移動させるための駆動機構及び基板とマスクのアライメントのために水平面に平行に(X方向、Y方向、θ方向に)静電チャック23や基板保持ユニット21などを移動させるための駆動機構などが設けられる。また、マスクと基板のアライメントのために、真空チャンバー20の天井に設けられた窓を通じて基板及びマスクに形成されたアライメントマークを撮影するアライメント用カメラ(不図示)も設けられる。 On the outer upper surface of the vacuum chamber 20 of the film forming apparatus 2, a drive mechanism for moving the substrate holding unit 21, the electrostatic chuck 23, the magnet 24, etc. in the vertical direction (Z direction) and alignment of the substrate and the mask. A drive mechanism and the like for moving the electrostatic chuck 23, the substrate holding unit 21, and the like are provided parallel to the horizontal plane (in the X direction, the Y direction, and the θ direction). In addition, an alignment camera (not shown) is also provided for photographing alignment marks formed on the substrate and the mask through a window provided on the ceiling of the vacuum chamber 20 for alignment between the mask and the substrate.

以下、本発明の実施形態の成膜装置による成膜プロセスを説明する。 The film forming process by the film forming apparatus according to the embodiment of the present invention will be described below.

搬送室13の搬送ロボット14によって基板が真空チャンバー20内に搬入されて基板保持ユニット21に置かれる。続いて、基板保持ユニット21に置かれた基板10とマスク台に置かれたマスク221との相対的位置の測定及び調整を行うアライメント工程が行われる。アライメント工程が完了すれば、基板保持ユニット21が駆動機構によって降りて基板10をマスク221上に置き、その後マグネット24が降りて基板10とマスク221を密着させる。このようなアライメント工程、基板をマスク上に置くための下降工程、マグネットによる基板とマスクの密着工程などにおいて、基板は基板保持ユニット21の支持部211,212と静電チャック23によって固定される。 The substrate is carried into the vacuum chamber 20 by the transfer robot 14 in the transfer chamber 13 and placed on the substrate holding unit 21. Subsequently, an alignment process is performed in which the relative position between the substrate 10 placed on the substrate holding unit 21 and the mask 221 placed on the mask table is measured and adjusted. When the alignment process is completed, the substrate holding unit 21 is lowered by the drive mechanism to place the substrate 10 on the mask 221, and then the magnet 24 is lowered to bring the substrate 10 and the mask 221 into close contact with each other. The substrate is fixed by the supporting portions 211 and 212 of the substrate holding unit 21 and the electrostatic chuck 23 in such an alignment process, a descending process for placing the substrate on the mask, and a process of adhering the substrate and the mask with a magnet.

この状態で、蒸着源25のシャッタが開かれて、蒸着源25のるつぼから蒸発された蒸着材料がマスクの微細パターン開口を通して基板に蒸着される。 In this state, the shutter of the evaporation source 25 is opened, and the evaporation material evaporated from the crucible of the evaporation source 25 is evaporated on the substrate through the fine pattern opening of the mask.

基板に蒸着された蒸着材料の膜厚が所定の厚さに到逹すれば、蒸着源25のシャッタが閉じ、その後、搬送ロボット14が基板を真空チャンバー20から搬送室13に搬出する。 When the film thickness of the vapor deposition material vapor-deposited on the substrate reaches a predetermined thickness, the shutter of the vapor deposition source 25 is closed, and then the transfer robot 14 carries the substrate out of the vacuum chamber 20 into the transfer chamber 13.

<基板保持ユニットの支持部の高さ>
以下、図3を参照して基板保持ユニット21の構成、特に、静電チャックとともに基板を保持する支持部211,212の構成を説明する。
<Height of support part of substrate holding unit>
Hereinafter, the configuration of the substrate holding unit 21, particularly the configuration of the supporting portions 211 and 212 that holds the substrate together with the electrostatic chuck will be described with reference to FIG.

基板保持ユニット21は、支持部211,212によって基板10の周縁部を保持して搬送する手段である。図3に図示した本発明の第1実施形態において、支持部211,212は基板の対向する二つの辺側の周縁部を支持するように設けられる。 The substrate holding unit 21 is a unit that holds and conveys the peripheral edge portion of the substrate 10 by the supporting portions 211 and 212. In the first embodiment of the present invention shown in FIG. 3, the supporting portions 211 and 212 are provided so as to support the peripheral portions on the two opposite side sides of the substrate.

基板保持ユニット21の支持部211,212は、基板の対向する二つの辺中いずれかの一つの辺(第1辺)に沿って設けられる複数の第1支持部材211ともう一つの辺(第2辺)に沿って設けられる複数の第2支持部材212を含む。例えば、複数の第1支持部材211は、基板の長辺方向(Y方向、第1方向)に沿って設けられ、複数の第2支持部材212は、複数の第1支持部材211と対向するように基板の長辺方向(Y方向、第1
方向)に設置される。図3には第1支持部材211及び第2支持部材212がそれぞれ複数の支持部材からなる構成を図示したが、本発明はこれに限定されず、第1支持部材211及び/または第2支持部材212はそれぞれ第1方向に長く延びる一つの支持部材で構成されてもよい。また、図3には、第1支持部材211及び第2支持部材212が基板の長辺に沿って設けられることを示したが、本発明はこれに限定されず、第1支持部材211及び第2支持部材212が基板の対向する短辺に沿って設けられてもいい。
The supporting portions 211 and 212 of the substrate holding unit 21 are provided with a plurality of first supporting members 211 and another side (first side) provided along one of the two sides (first side) of the substrate facing each other. It includes a plurality of second support members 212 provided along two sides. For example, the plurality of first support members 211 are provided along the long side direction (Y direction, first direction) of the substrate, and the plurality of second support members 212 face the plurality of first support members 211. In the long side direction of the substrate (Y direction, first
Direction). Although FIG. 3 illustrates a configuration in which the first support member 211 and the second support member 212 each include a plurality of support members, the present invention is not limited to this, and the first support member 211 and/or the second support member are included. 212 may each be composed of a single support member extending in the first direction. Further, although FIG. 3 illustrates that the first support member 211 and the second support member 212 are provided along the long side of the substrate, the present invention is not limited to this, and the first support member 211 and the second support member 211 are provided. The two support members 212 may be provided along the opposite short sides of the substrate.

図3(a)に図示したように、第1支持部材211の基板支持面と第2支持部材212の基板支持面は鉛直方向(Z軸方向)においてお互いに異なる高さを持つ。図3(a)に図示された実施形態では、第1支持部材211の基板支持面が第2支持部材212の基板支持面より高く設置される。例えば、第1支持部材211の基板支持面の高さと第2支持部材212の基板支持面の高さの差は0.1mm以上1mm以下になるように設置される。高さの差が0.1mm未満になれば、第1支持部材211によって支持される基板周縁部と第2支持部材212によって支持される基板周縁部とがほとんど同時に静電チャック23に吸着される可能性があり、高さの差が1mmより大きくなれば、静電チャック23に吸着される前の基板の傾きが大きくなって基板が一方に傾く恐れがある。 As shown in FIG. 3A, the substrate support surface of the first support member 211 and the substrate support surface of the second support member 212 have different heights in the vertical direction (Z-axis direction). In the embodiment shown in FIG. 3A, the substrate supporting surface of the first supporting member 211 is installed higher than the substrate supporting surface of the second supporting member 212. For example, the difference between the height of the substrate supporting surface of the first supporting member 211 and the height of the substrate supporting surface of the second supporting member 212 is set to be 0.1 mm or more and 1 mm or less. When the height difference is less than 0.1 mm, the substrate peripheral edge supported by the first support member 211 and the substrate peripheral edge supported by the second support member 212 are attracted to the electrostatic chuck 23 almost at the same time. If the height difference is larger than 1 mm, the inclination of the substrate before being attracted to the electrostatic chuck 23 becomes large and the substrate may be inclined to one side.

本発明の第1実施形態においては、基板の第1辺に沿って設置される複数の第1支持部材211は全て同じ高さを持ち、基板の第2辺に沿って設置される複数の第2支持部材212も全て同じ高さを持つが、本発明はこれに限定されず、複数の第1支持部材211または複数の第2支持部材212の中でも支持部の基板支持面の高さが異なり得る。例えば、基板の第1辺(例えば、長辺)に沿って設置される複数の第1支持部材211中第1辺の両角の中のいずれかの一つの角に近い支持部材211の基板支持面を他の第1支持部材211の基板支持面より高くすることができる。複数の第2支持部材212も、第2辺(例えば、長辺)の両角の中のいずれかの一つの角に近い支持部材212の基板支持面の高さを他の第2支持部材212の基板支持面の高さより高くすることができる。この場合、四角形基板の対角線上の二つの角の中のいずれかの一つの角に隣接した支持部材の基板支持面の高さが対角線上の他の一つの角に隣接した支持部材の基板支持面の高さより高くなる。 In the first embodiment of the present invention, the plurality of first support members 211 installed along the first side of the substrate have the same height, and the plurality of first support members 211 installed along the second side of the substrate. The two support members 212 all have the same height, but the present invention is not limited to this. Among the plurality of first support members 211 or the plurality of second support members 212, the height of the substrate support surface of the support portion is different. obtain. For example, the substrate support surface of the support member 211 close to any one of both corners of the first side among the plurality of first support members 211 installed along the first side (eg, long side) of the substrate. Can be higher than the substrate supporting surface of the other first supporting member 211. In the plurality of second support members 212 as well, the height of the substrate support surface of the support member 212 close to any one of both corners of the second side (for example, the long side) is set to the height of the other second support member 212. It can be higher than the height of the substrate supporting surface. In this case, the height of the substrate supporting surface of the supporting member adjacent to any one of the two corners on the diagonal of the square substrate has the height of the substrate supporting surface of the supporting member adjacent to the other corner on the diagonal. It is higher than the height of the surface.

基板の下面の周縁部を支持する支持部211、212は、その基板支持面が基板保持ユニット21に対して鉛直方向(Z方向)に移動可能に設置される。このために、支持部は弾性部材を含むことができる。例えば、支持部の弾性部材は、スプリングやシリコーンゴムのような弾性部材であることができるが、これに限定されない。これについては、図5を参照して後述する。 The support portions 211 and 212 that support the peripheral portion of the lower surface of the substrate are installed such that their substrate support surfaces are movable in the vertical direction (Z direction) with respect to the substrate holding unit 21. To this end, the support may include an elastic member. For example, the elastic member of the support portion may be an elastic member such as a spring or silicone rubber, but is not limited thereto. This will be described later with reference to FIG.

静電回路(不図示)が埋め込まれた静電チャック23は、基板の上部に平らに設置される。 従って、静電チャック23がターンオン(turn on)される(埋め込まれた静電回路に電圧が加えられる)瞬間には、静電チャック23と第1支持部材211の基板支持面(により支持される基板の周縁部)と間の距離が、静電チャック23と第2支持部材212の基板支持面(により支持される基板の周縁部)と間の距離より短い。 The electrostatic chuck 23, in which an electrostatic circuit (not shown) is embedded, is installed flat on the substrate. Therefore, at the moment when the electrostatic chuck 23 is turned on (voltage is applied to the embedded electrostatic circuit), the electrostatic chuck 23 is supported by the electrostatic chuck 23 and the substrate supporting surface of the first supporting member 211. The distance between the substrate (peripheral portion of the substrate) and the electrostatic chuck 23 is shorter than the distance between (the peripheral portion of the substrate supported by) the substrate supporting surface of the second supporting member 212.

この状態で、静電チャック23が鉛直方向(Z軸方向)に降りれば、図3(a)に図示したように、静電チャックの下面が第1支持部材211によって支持された基板10の第1辺に沿った周縁部に先に接触するようになる。基板の第2辺側の周縁部を支持している第2支持部材212は、第1支持部材211より高さが低いので、基板の第2辺に沿った周縁部は静電チャック23と接触されず静電チャック23との間に間隙が存在する。 In this state, when the electrostatic chuck 23 descends in the vertical direction (Z-axis direction), as shown in FIG. 3A, the lower surface of the electrostatic chuck 23 of the substrate 10 supported by the first supporting member 211 is removed. It comes into contact with the peripheral portion along one side first. Since the second supporting member 212 supporting the peripheral portion on the second side of the substrate is lower in height than the first supporting member 211, the peripheral portion along the second side of the substrate contacts the electrostatic chuck 23. However, there is a gap with the electrostatic chuck 23.

この状態で、静電チャック23が鉛直方向にさらに降りたら、基板の第1辺に沿った周縁部から基板の中央部に向けて矢印Aの方向に吸着が進み、静電チャック23が第2支持
部材212の高さまで降りると、基板の中央部から基板の第2辺に沿った周縁部の方に吸着が進み、最終的に基板の第2辺に沿った周縁部が静電チャック23に吸着される。静電チャック23が第2支持部材212の高さまで降りれば、基板保持ユニット21の第1支持部材211の基板支持面と第2支持部材212の基板支持面は高さが同じくなる。
In this state, when the electrostatic chuck 23 further descends in the vertical direction, adsorption progresses in the direction of arrow A from the peripheral portion along the first side of the substrate toward the central portion of the substrate, and the electrostatic chuck 23 moves to the second position. When the substrate is lowered to the height of the support member 212, the adsorption proceeds from the central portion of the substrate toward the peripheral portion along the second side of the substrate, and finally the peripheral portion along the second side of the substrate reaches the electrostatic chuck 23. Adsorbed. When the electrostatic chuck 23 descends to the height of the second supporting member 212, the substrate supporting surface of the first supporting member 211 and the substrate supporting surface of the second supporting member 212 of the substrate holding unit 21 have the same height.

このように、本実施形態においては、基板保持ユニット21の第1支持部材211の基板支持面と第2支持部材212の基板支持面の高さをお互いに異ならせることで(すなわち、支持部の基板支持面から静電チャックまでの距離をお互いに異ならせることで)、静電チャック23への吸着が第1支持部材211によって支持される基板の第1辺に沿った周縁部から基板の中央部を経て基板の第2辺に沿った周縁部に順次に進むことになり、基板の自重による基板の中央部の撓みが第2辺側の方に伸びながら基板全体が静電チャック23に間隙やしわなく平らに密着されるようになる。すなわち、従来の支持部と違って、基板の対向する二つの辺を支持する支持部材の基板支持面から静電チャックまでの距離がお互いに異なるので、静電チャック23が基板10の方に降りてきて最初に基板と接触される部位が対向する両辺の周縁部ではなくある一つの辺(第1辺)側の周縁部だけになり、静電チャック23の下降が続くことによって基板の中央部を経て他の辺(第2辺)側の周縁部が最終的に静電チャックに吸着されるようになるので、基板の中央部の撓みを他の辺(第2辺)側の方に伸ばすことができる。 As described above, in the present embodiment, the heights of the substrate supporting surface of the first supporting member 211 and the substrate supporting surface of the second supporting member 212 of the substrate holding unit 21 are different from each other (that is, the height of the supporting portion is different). By making the distance from the substrate supporting surface to the electrostatic chuck different from each other), the adsorption to the electrostatic chuck 23 is performed from the peripheral portion along the first side of the substrate supported by the first supporting member 211 to the center of the substrate. As a result, the bending of the central portion of the substrate due to the weight of the substrate extends toward the second side while the entire substrate is separated by the electrostatic chuck 23. It will come into close contact without wrinkles. That is, unlike the conventional supporting unit, the distance from the substrate supporting surface of the supporting member supporting the two opposite sides of the substrate to the electrostatic chuck is different from each other, so that the electrostatic chuck 23 is lowered toward the substrate 10. The first contact portion with the substrate is not the peripheral portions of both sides facing each other but only the peripheral portion on one side (first side) side, and as the electrostatic chuck 23 continues to descend, the central portion of the substrate After that, the peripheral edge portion on the other side (second side) is finally attracted to the electrostatic chuck, so that the bending of the central portion of the substrate is extended to the other side (second side) side. be able to.

本実施形態においては、静電チャック23に電圧を加えターンオンさせた状態で、基板への下降を開始すると説明したが、本発明はこれに限定されない。例えば、静電チャック23をオフの状態で基板に向かって下降させ、基板と部分的に(例えば、第1支持部材211によって支持された基板の第1辺に沿う周縁部と)接触された状態で、静電チャック23に電圧を加えターンオンさせることで、基板吸着を行うこともできる。または、静電チャック23の下降が開始された後、基板と接触していない状態で静電チャック23をターンオンさせることもできる。このような場合にも、上述した本発明の効果を奏することができる。 In the present embodiment, it is described that the electrostatic chuck 23 starts to descend to the substrate in a state where a voltage is applied to the electrostatic chuck 23 and turned on, but the present invention is not limited to this. For example, the electrostatic chuck 23 is lowered toward the substrate in the off state, and is partially contacted with the substrate (for example, the peripheral portion along the first side of the substrate supported by the first supporting member 211). Then, by applying a voltage to the electrostatic chuck 23 and turning it on, the substrate can be attracted. Alternatively, after the electrostatic chuck 23 starts to descend, the electrostatic chuck 23 may be turned on without being in contact with the substrate. Even in such a case, the effects of the present invention described above can be achieved.

以下、図4を参照して、本発明の他の実施形態(第2乃至第6実施形態)について説明する。図4に図示した実施形態では、基板保持ユニット21が基板10の第1辺(例えば、長辺)側の周縁部及び第2辺(例えば、長辺)側の周縁部を支持する第1支持部材211及び第2支持部材212だけでなく、残り対向する二つの辺(第3辺及び第4辺)に沿って配置される複数の第3支持部材213及び複数の第4支持部材214をさらに含む。例えば、複数の第3支持部材213及び複数の第4支持部材214は基板の短辺方向(X方向、第1方向と交差する第2方向)に沿って配置される。 Hereinafter, another embodiment of the present invention (second to sixth embodiments) will be described with reference to FIG. In the embodiment illustrated in FIG. 4, the substrate support unit 21 supports the first side (for example, long side) side peripheral portion and the second side (for example, long side) side peripheral portion of the substrate 10 as a first support. In addition to the member 211 and the second support member 212, a plurality of third support members 213 and a plurality of fourth support members 214 arranged along the remaining two opposite sides (the third side and the fourth side) are further provided. Including. For example, the plurality of third support members 213 and the plurality of fourth support members 214 are arranged along the short side direction (X direction, second direction intersecting the first direction) of the substrate.

本発明の第2実施形態(図4(b))及び第3実施形態(図4(c))においては、基板保持ユニット21の第3支持部材213及び第4支持部材214が第2支持部材212よりその基板支持面が高い。すなわち、図4(b)及び図4(c)に図示されたように、基板の4辺の中の一辺の第2辺側の周縁部を支持する第2支持部材212が残り3辺側の周縁部を支持する支持部材211、213、214よりその基板支持面が低く設置される。この場合、複数の第3支持部材213及び複数の第4支持部材214は、図4(b)に図示したように、その基板支持面が第1支持部材211の基板支持面と同じ高さを持つこともでき(第2実施形態)、図4(c)に図示したように、第1支持部材211から第2支持部材212に向かって段階的に異なる高さを持つ(例えば、段階的に高さが低くなるようにする)こともできる(第3実施形態)。これによって、基板の撓み又はしわを基板支持面が一番低い第2支持部材212によって支持される基板の第2辺側に逃がせることができる。 In the second embodiment (FIG. 4B) and the third embodiment (FIG. 4C) of the present invention, the third supporting member 213 and the fourth supporting member 214 of the substrate holding unit 21 are the second supporting members. Its substrate support surface is higher than 212. That is, as shown in FIG. 4B and FIG. 4C, the second support member 212 that supports the peripheral portion on the second side of one of the four sides of the substrate has the remaining three sides. The substrate supporting surface is set lower than the supporting members 211, 213 and 214 supporting the peripheral portion. In this case, as for the plurality of third support members 213 and the plurality of fourth support members 214, the substrate support surface thereof has the same height as the substrate support surface of the first support member 211, as shown in FIG. 4B. It may be held (second embodiment), and as shown in FIG. 4(c), the first support member 211 and the second support member 212 have stepwise different heights (for example, stepwise). The height can be made low) (third embodiment). Accordingly, the bending or wrinkling of the substrate can be released to the second side of the substrate supported by the second supporting member 212 having the lowest substrate supporting surface.

本発明の他の実施形態においては、基板保持ユニット21の第3支持部材213の基板
支持面及び第4支持部材214の基板支持面が、第1支持部材211の基板支持面より低く設置されることもできる。すなわち、基板の4辺の中でどの一つの辺の第1辺を支持する第1支持部材211が残り3辺を支持する支持部材212、213、214より高く設置されることができる。この場合、第3支持部材213及び第4支持部材214は、その基板支持面が図4(d)に図示したように、第2支持部材212の基板支持面と同じ高さを持つことができる(第4実施形態)。
In another embodiment of the present invention, the substrate supporting surface of the third supporting member 213 and the substrate supporting surface of the fourth supporting member 214 of the substrate holding unit 21 are set lower than the substrate supporting surface of the first supporting member 211. You can also That is, the first supporting member 211 supporting any one of the four sides of the substrate can be installed higher than the supporting members 212, 213 and 214 supporting the remaining three sides. In this case, the substrate supporting surfaces of the third supporting member 213 and the fourth supporting member 214 may have the same height as the substrate supporting surface of the second supporting member 212, as shown in FIG. 4D. (4th Embodiment).

本発明の他の実施形態では、四角形基板の対角線の一側を支持する(または全体的に四角形状を成すように支持部材が配置された支持部の対角線上の一側の)支持部材の基板支持面の高さが対角線の反対側を支持する支持部材の基板支持面より高さが高い。例えば、図4(e)に図示したように、隣接する二つの辺を支持する支持部材211、213が向かい合う他の二つの辺を支持する支持部材212、214よりその基板支持面が高い(第5実施形態)。 In another embodiment of the present invention, a substrate of a supporting member that supports one side of a diagonal of a square substrate (or one side of a diagonal of a supporting portion in which the supporting member is arranged so as to form a generally rectangular shape). The height of the support surface is higher than the substrate support surface of the support member that supports the opposite side of the diagonal line. For example, as shown in FIG. 4E, the substrate supporting surface is higher than the supporting members 211 and 213 that support two adjacent sides, and the supporting members 212 and 214 that support the other two opposing sides (first 5 embodiments).

本発明の第6実施形態においては、図4(f)に図示したように、四角形基板の対角線上の二つの角の中のいずれかの一つの角あたりを支持する(支持部材が四角形を成すように配置された支持部の対角線上の二つの角の中のいずれかの一つの角あたりの)支持部材の基板支持面が該当対角線の反対側の角あたりを支持する(支持部材が四角形を成すように配置された支持部の対角線上の二つの角の中の反対側の角あたりの)支持部材の基板支持面より高い。基板の周縁部を支持する残りの支持部材は前記一つの角から対角線上の反対側の角に行くにつれて、その基板支持面が段階的に低くなるように設置されることができる。 In the sixth embodiment of the present invention, as shown in FIG. 4(f), one of the two corners on the diagonal of the rectangular substrate is supported (the supporting member forms a quadrangle). The substrate supporting surface of the supporting member supports the corners on the opposite side of the corresponding diagonal line (the supporting member forms a quadrangle). Higher than the substrate support surface of the support member (per the opposite corner of the two diagonal corners of the support arranged). The remaining supporting members for supporting the peripheral portion of the substrate may be installed such that the substrate supporting surface gradually lowers from the one corner to the opposite corner on the diagonal line.

本発明の前記実施形態では基板が四角形状を持つことを前提に説明したが、本発明はこれに限定されず、基板が四角形状ではなくても基板の対向する部分がお互いに異なる高さの基板支持面を持つ支持部材によって支持される限り、本発明の効果を奏することができる。 The above embodiment of the present invention has been described on the assumption that the substrate has a quadrangular shape, but the present invention is not limited to this, and even if the substrate is not a quadrangular shape, the facing portions of the substrate have different heights. As long as it is supported by the supporting member having the substrate supporting surface, the effects of the present invention can be obtained.

本発明の前記実施形態では、静電チャック23が降りて基板保持ユニット21の支持部材211、212、213、214によって支持された基板を吸着すると説明したが、本発明はこれに限定されず、基板保持ユニット21が上昇して基板が静電チャック23に吸着されることもできる。 In the above-described embodiment of the present invention, it is described that the electrostatic chuck 23 descends to adsorb the substrate supported by the support members 211, 212, 213, 214 of the substrate holding unit 21, but the present invention is not limited to this. The substrate holding unit 21 may be raised and the substrate may be attracted to the electrostatic chuck 23.

本発明の前記実施形態では、基板が基板保持ユニット21の支持部211、212と基板上に設置された静電チャック23によって挟持されて固定されると説明したが、本発明はこれに限定されず、支持具と加圧具からなる別途の挟持機構(基板クランプ)を追加で含むこともできる。 In the above-described embodiment of the present invention, it is described that the substrate is sandwiched and fixed by the support portions 211 and 212 of the substrate holding unit 21 and the electrostatic chuck 23 installed on the substrate, but the present invention is not limited to this. Alternatively, a separate clamping mechanism (substrate clamp) including a support tool and a pressure tool can be additionally included.

本発明の前記実施形態では、静電チャックが平板であり基板を支持する支持部材の高さが異なる構成を主に説明したが、本発明はこれに限定されず、静電チャックが段差を持って基板を支持する支持部材が同じ高さをもつ構成にしてもよい。 In the above-described embodiment of the present invention, the configuration in which the electrostatic chuck is a flat plate and the height of the supporting member that supports the substrate is different has been mainly described, but the present invention is not limited to this, and the electrostatic chuck has a step. The supporting members for supporting the substrate may have the same height.

このように、本発明の前記実施形態においては、基板の下面の周縁部(4辺)を支持する基板保持ユニット21の支持部の中のいずれかの一辺側または一角側の周縁部を支持する支持部材の基板支持面が、対向する他の辺側または対角線上の反対側の角側の周縁部を支持する支持部材の基板支持面と異なる高さを有するように設置することで、静電チャック23への吸着の際、基板の下面の周縁部が同時に静電チャック23に吸着されず、ある一辺側からこれと対向する他の辺側に順次に吸着が進むようになり、基板の自重による撓み又はしわを効果的にとり除くことができる。 As described above, in the above-described embodiment of the present invention, any one of the supporting portions of the substrate holding unit 21 that supports the peripheral portion (four sides) of the lower surface of the substrate supports the peripheral portion on one side or one side. The substrate supporting surface of the supporting member is installed so that it has a different height from the substrate supporting surface of the supporting member that supports the other peripheral side of the opposite side or the opposite corner side of the diagonal line. At the time of adsorption to the chuck 23, the peripheral portion of the lower surface of the substrate is not adsorbed to the electrostatic chuck 23 at the same time, and the adsorption gradually proceeds from one side to the other side opposite thereto, and the substrate's own weight is applied. It is possible to effectively remove the bending or the wrinkle due to.

<基板保持ユニットの弾性体支持部>
本発明の一実施形態の基板保持ユニット21の支持部は弾性体を含んで構成される。例えば、図5(a)に図示したように、支持部の複数の支持部材211、212、213、214それぞれは、基板支持面部30と弾性体部31を含む。基板支持面部30は基板の下面の周縁部を支持し、弾性体部31は基板支持面部30を弾性的に変位可能に支持する。
<Elastic support of substrate holding unit>
The support portion of the substrate holding unit 21 according to the embodiment of the present invention includes an elastic body. For example, as shown in FIG. 5A, each of the plurality of support members 211, 212, 213, and 214 of the support unit includes the substrate support surface portion 30 and the elastic body portion 31. The substrate supporting surface portion 30 supports the peripheral portion of the lower surface of the substrate, and the elastic body portion 31 supports the substrate supporting surface portion 30 so as to be elastically displaceable.

弾性体部31に使われる弾性体としては、コイルスプリング、板スプリング、シリコーンゴムなどを用いることができるが、本発明はこれに限定されず、支持部材の基板支持面部を弾性的に変位可能に支持することができる限り、他の構成を含むことができる。 A coil spring, a leaf spring, silicone rubber, or the like can be used as the elastic body used for the elastic body portion 31, but the present invention is not limited to this, and the substrate supporting surface portion of the supporting member can be elastically displaced. Other configurations can be included as long as they can be supported.

本発明の一実施形態において、複数の支持部材211、212、213、214中、基板のある一辺(第1辺)に沿った周縁部に対応する位置に設置される第1支持部材211は、他の支持部材に比べて基板支持面部30の高さが高い。例えば、図5(a)に図示したように、第1支持部材211の弾性体部31の長さは、第2支持部材212の弾性体部31の長さより長い。 In one embodiment of the present invention, among the plurality of support members 211, 212, 213, 214, the first support member 211 installed at a position corresponding to a peripheral edge along one side (first side) of the substrate is: The height of the substrate supporting surface portion 30 is higher than that of other supporting members. For example, as illustrated in FIG. 5A, the length of the elastic body portion 31 of the first support member 211 is longer than the length of the elastic body portion 31 of the second support member 212.

このような構成によって、基板保持ユニット21の支持部に基板が置かれた状態で基板保持ユニット21の上昇または静電チャック23の下降によって基板10が静電チャック23と接触する際、基板支持面部30の高さが高い第1支持部材211によって支持される基板の第1辺側の周縁部が静電チャック23の下面と先に接触して吸着される。 With this configuration, when the substrate 10 is brought into contact with the electrostatic chuck 23 when the substrate holding unit 21 is lifted or the electrostatic chuck 23 is lowered while the substrate is placed on the supporting portion of the substrate holding unit 21, the substrate supporting surface portion The first side peripheral edge of the substrate supported by the first support member 211 having a high height of 30 first comes into contact with the lower surface of the electrostatic chuck 23 and is attracted thereto.

続いて、静電チャック23と基板10との間の距離がもっと縮めば、例えば、第1支持部材211の弾性体部31は、静電チャック23からの加圧力によって弾性的に圧縮され、これによって第1支持部材211の基板支持面部30は変位、すなわち、下方に下がるようになる。第1支持部材211の弾性体部31が弾性的に圧縮されるにつれて、第1支持部材211の基板支持面部30の高さと第2支持部材212の基板支持面部30の高さとの差が小さくなりながら、基板の第1辺側周縁部から基板の中央部に向かって基板の静電チャック23への吸着が進む。静電チャック23と基板10の間の距離がもっと縮まると、基板の中央部から基板の第2辺側の周縁部に向かって基板の吸着が進む。 Subsequently, when the distance between the electrostatic chuck 23 and the substrate 10 is further reduced, for example, the elastic body portion 31 of the first support member 211 is elastically compressed by the pressing force from the electrostatic chuck 23, As a result, the substrate support surface portion 30 of the first support member 211 is displaced, that is, lowered. As the elastic body portion 31 of the first supporting member 211 is elastically compressed, the difference between the height of the substrate supporting surface portion 30 of the first supporting member 211 and the height of the substrate supporting surface portion 30 of the second supporting member 212 becomes smaller. However, the adsorption of the substrate on the electrostatic chuck 23 progresses from the first side peripheral portion of the substrate toward the central portion of the substrate. When the distance between the electrostatic chuck 23 and the substrate 10 is further reduced, the adsorption of the substrate progresses from the central portion of the substrate toward the peripheral portion on the second side of the substrate.

静電チャック23が第2支持部材212の基板支持面部30の高さまで近接すれば、第2支持部材212によって支持される基板の第2辺側の周縁部が静電チャック23に吸着されて、この時、第1支持部材211の基板支持面部30の高さが第2支持部材212の基板支持面部30の高さと同じくなり、全体的に基板は静電チャック23に平らな状態で吸着されるようになる。 When the electrostatic chuck 23 approaches the height of the substrate support surface portion 30 of the second support member 212, the peripheral edge portion of the second side of the substrate supported by the second support member 212 is attracted to the electrostatic chuck 23, At this time, the height of the substrate support surface portion 30 of the first support member 211 becomes the same as the height of the substrate support surface portion 30 of the second support member 212, and the substrate is entirely attracted to the electrostatic chuck 23 in a flat state. Like

図5(a)には、支持部材の基板支持面部30の変位軸と弾性体部31の変位軸が一致するように図示したが、本発明はこれに限定されず、基板支持面部30の変位軸と弾性体部31の変位軸とが互いに異なるように構成することもできる。すなわち、図5(b)に図示したように、基板支持面部30の変位軸と弾性体部31の変位軸とが基板面に平行な方向において互いに離隔するように構成することもできる(すなわち、両変位軸が互いに平行になるように構成することができる)。このような構成において、基板保持ユニット21の支持部材は、基板支持面部30の変位をガイドするガイド部32をさらに含むことができる。弾性体部31は、図5(b)に図示したように、基板が静電チャック23と接触するによって圧縮変位する構成だけではなく引張変位するように構成することもできる。 In FIG. 5A, the displacement axis of the substrate support surface portion 30 of the support member and the displacement axis of the elastic body portion 31 are illustrated to be the same, but the present invention is not limited to this, and the displacement of the substrate support surface portion 30 is not limited to this. The axis and the displacement axis of the elastic body portion 31 may be different from each other. That is, as shown in FIG. 5B, the displacement axis of the substrate support surface portion 30 and the displacement axis of the elastic body portion 31 may be separated from each other in the direction parallel to the substrate surface (that is, Both displacement axes can be configured to be parallel to each other). In such a configuration, the support member of the substrate holding unit 21 may further include a guide portion 32 that guides the displacement of the substrate support surface portion 30. As shown in FIG. 5B, the elastic body portion 31 may be configured not only to be compressed and displaced by the substrate coming into contact with the electrostatic chuck 23 but also to be tensilely displaced.

本実施形態では、支持部材が弾性体部31を含むように構成することで、基板支持面部30によって支持された基板が静電チャックから加圧力を受ける際、基板が破損されるこ
とを防止することができ、各支持部材が製造誤差によって基板支持面部30の高さが同じではなくても全体的な支持部の機能に及ぶ影響を弾性体部31の弾性変位によって低減することができる。
In the present embodiment, the support member is configured to include the elastic body portion 31 to prevent the substrate supported by the substrate support surface portion 30 from being damaged when the substrate is subjected to pressure from the electrostatic chuck. Even if the heights of the substrate supporting surface portions 30 are not the same due to manufacturing errors of the supporting members, the elastic displacement of the elastic body portion 31 can reduce the influence on the overall function of the supporting portion.

<基板保持ユニットの支持部の基板支持力>
本発明の一実施形態の基板保持ユニット21の支持部は、基板の下面の周縁部を支持するように設置されるが、この時、支持部の複数の支持部材211、212が基板を支持する支持力が支持部材によって変わるように設定されることができる。すなわち、基板保持ユニット21の支持部は、基板の対向する二つの辺の中でいずれかの一つの辺である第1辺側を支持する第1支持部材211が基板を支持する支持力と他の一つの辺である第2辺側を支持する第2支持部材212が基板を支持する支持力とがお互いに異なるように設置される。例えば、第1支持部材211が基板を支持する支持力は第2支持部材212が基板を支持する支持力より大きくなるように設定される。
<Substrate supporting force of the supporting portion of the substrate holding unit>
The supporting unit of the substrate holding unit 21 according to the embodiment of the present invention is installed so as to support the peripheral portion of the lower surface of the substrate. At this time, the plurality of supporting members 211 and 212 of the supporting unit support the substrate. The supporting force can be set to vary depending on the supporting member. That is, the supporting portion of the substrate holding unit 21 has a supporting force for supporting the substrate by the first supporting member 211 supporting the first side, which is one of the two opposing sides of the substrate. The second supporting member 212 supporting the second side, which is one side of the substrate, is installed so that the supporting force for supporting the substrate is different from each other. For example, the supporting force of the first supporting member 211 for supporting the substrate is set to be larger than the supporting force of the second supporting member 212 for supporting the substrate.

このために、図5(c)に図示したように、第1支持部材211の弾性体部31の弾性係数を第2支持部材212の弾性体部31の弾性係数より大きくするか、第1支持部材211の弾性体部31の長さを第2支持部材212の弾性体部31の長さより長くする。第1支持部材211の弾性体部31の長さが長ければ、第1支持部材211の弾性体部31が静電チャック23からの加圧力によって弾性変位(引張変位または圧縮変位)される距離が第2支持部材212の弾性体部31が弾性変位される距離より長くなるので、結果的に第1支持部材211が基板を支持する支持力は第2支持部材212が基板を支持する支持力より大きくなることができる。 Therefore, as shown in FIG. 5C, the elastic coefficient of the elastic body portion 31 of the first supporting member 211 is set to be larger than that of the elastic body portion 31 of the second supporting member 212, or The length of the elastic body portion 31 of the member 211 is made longer than the length of the elastic body portion 31 of the second support member 212. If the length of the elastic body portion 31 of the first support member 211 is long, the distance by which the elastic body portion 31 of the first support member 211 is elastically displaced (tensile displacement or compression displacement) by the pressing force from the electrostatic chuck 23 is increased. Since the elastic body portion 31 of the second supporting member 212 is longer than the elastically displaced distance, the supporting force of the first supporting member 211 for supporting the substrate is higher than the supporting force of the second supporting member 212 for supporting the substrate. Can grow.

このように第1支持部材211の支持力を第2支持部材212の支持力より大きくすることで、基板中央部の撓みを支持力が小さな第2支持部材212側の方に伸ばすことができるので、基板が全体的に静電チャック23に平らに吸着されることができるようになる。 By making the supporting force of the first supporting member 211 larger than the supporting force of the second supporting member 212 in this way, the bending of the central portion of the substrate can be extended toward the second supporting member 212 side where the supporting force is small. The substrate can be attracted to the electrostatic chuck 23 evenly.

本発明の一実施形態では、第1支持部材211の支持力が第2支持部材212の支持力より大きくなる限り、弾性体部の弾性係数と長さは様々な他の組合せができる。 In the embodiment of the present invention, the elastic coefficient and the length of the elastic body may be variously combined as long as the supporting force of the first supporting member 211 is larger than the supporting force of the second supporting member 212.

例えば、図5(c)に図示したように、第1支持部材211の弾性体部31の弾性係数及び長さが第2支持部材212の弾性体部31の弾性係数及び長さより大きくて長くすることができ、第1支持部材211の弾性体部31の弾性係数と第2支持部材212の弾性体部31の弾性係数は同じではあるが、第1支持部材211の弾性体部31の長さが第2支持部材212の弾性体部31の長さより長くすることもできる。第1支持部材211の弾性体部の弾性係数が第2支持部材212の弾性体部の弾性係数と同じであっても、上記したように第1支持部材211の弾性体部31の長さが第2支持部材212の弾性体部の長さより長ければ、結果的に第1支持部材211の支持力が第2支持部材212の支持力より大きくなることができる。 For example, as illustrated in FIG. 5C, the elastic coefficient and the length of the elastic body portion 31 of the first support member 211 are set to be larger than the elastic coefficient and the length of the elastic body portion 31 of the second support member 212. The elastic coefficient of the elastic body portion 31 of the first support member 211 and the elastic coefficient of the elastic body portion 31 of the second support member 212 are the same, but the length of the elastic body portion 31 of the first support member 211 is the same. Can be longer than the length of the elastic body portion 31 of the second support member 212. Even if the elastic coefficient of the elastic body portion of the first support member 211 is the same as that of the elastic body portion of the second support member 212, the length of the elastic body portion 31 of the first support member 211 is as described above. If it is longer than the length of the elastic body portion of the second supporting member 212, the supporting force of the first supporting member 211 can be larger than the supporting force of the second supporting member 212 as a result.

また、第1支持部材211の弾性体部の弾性係数が第2支持部材212の弾性体部の弾性係数より小さくても第1支持部材211の弾性体部31の長さが第2支持部材212の弾性体部31の長さより十分に長ければ、結果的に第1支持部材211の支持力が第2支持部材212の支持力より大きくなることができる。また、第1支持部材211及び第2支持部材212の弾性体部の長さが同じであっても、弾性係数を互いに異なるようにすることで支持力の差を付与することもできる。 Further, even if the elastic coefficient of the elastic body portion of the first support member 211 is smaller than the elastic coefficient of the elastic body portion of the second support member 212, the length of the elastic body portion 31 of the first support member 211 is the second support member 212. If it is sufficiently longer than the length of the elastic body portion 31, the supporting force of the first supporting member 211 can be larger than the supporting force of the second supporting member 212 as a result. Further, even if the elastic body portions of the first support member 211 and the second support member 212 have the same length, it is possible to give a difference in support force by making the elastic coefficients different from each other.

本発明の一実施形態の基板保持ユニット21の支持部は、基板の第1辺側の周縁部を支持するように配置される複数の第1支持部材211、第1辺と対向する第2辺側の基板周
縁部を支持するように配置される複数の第2支持部材212以外に、第1辺と第2辺とを繋ぐ第3辺側及び第4辺側の基板周縁部を支持するように配置される複数の第3支持部材213及び複数の第4支持部材214を含むことができる。この際、第3支持部材213及び第4支持部材214の弾性体部31の弾性係数及び長さは、第3支持部材213及び第4支持部材214が基板の第3辺側の周縁部及び第4辺側の周縁部を支持する支持力が第1支持部材211の支持力より小さくなるように設定するのが望ましい。より望ましくは、第3支持部材213及び第4支持部材214による支持力が第2支持部材212による支持力より大きくなるように弾性係数及び/または長さを設定する。このように、支持部材の支持力を調節することで、基板10が静電チャック23に吸着される時、第1辺(例えば、対向する二つの長辺の中である一長辺)側の基板周縁部から基板の中央部を経て第2辺(例えば、対向する二つの長辺の中で他の一つの長辺)側に向かって吸着が順次に進むことができ、基板が平らに静電チャックに吸着されるようになる。
The supporting portion of the substrate holding unit 21 according to the embodiment of the present invention includes a plurality of first supporting members 211 arranged to support the peripheral portion of the substrate on the first side side, and a second side facing the first side. In addition to the plurality of second support members 212 arranged so as to support the substrate peripheral portion on the side, the substrate peripheral portions on the third side and the fourth side connecting the first side and the second side are supported. A plurality of third support members 213 and a plurality of fourth support members 214 arranged in the same. At this time, the elastic coefficients and the lengths of the elastic body portions 31 of the third support member 213 and the fourth support member 214 are determined such that the third support member 213 and the fourth support member 214 have the peripheral portion on the third side of the substrate and the third support member 213. It is desirable to set the supporting force for supporting the peripheral portions on the four sides to be smaller than the supporting force of the first supporting member 211. More preferably, the elastic coefficient and/or the length are set so that the supporting force of the third supporting member 213 and the fourth supporting member 214 is larger than the supporting force of the second supporting member 212. As described above, by adjusting the supporting force of the supporting member, when the substrate 10 is attracted to the electrostatic chuck 23, the first side (for example, one long side of the two long sides facing each other) side. Adsorption can be sequentially progressed from the peripheral portion of the substrate to the second side (for example, the other one of the two long sides facing each other) through the center of the substrate, and the substrate can be flattened and settled. It will be adsorbed on the electric chuck.

<電子デバイスの製造方法>
次に、本発明の一実施形態の成膜装置を用いた電子デバイスの製造方法の一例を説明する。以下、電子デバイスの例として有機EL表示装置の構成及び製造方法を例示する。
<Electronic device manufacturing method>
Next, an example of a method for manufacturing an electronic device using the film forming apparatus according to the embodiment of the present invention will be described. Hereinafter, a configuration and a manufacturing method of an organic EL display device will be illustrated as an example of an electronic device.

まず、製造する有機EL表示装置について説明する。図6(a)は有機EL表示装置60の全体図、図6(b)は1画素の断面構造を表している。
図6(a)に示すように、有機EL表示装置60の表示領域61には、発光素子を複数備える画素62がマトリクス状に複数配置されている。詳細は後で説明するが、発光素子のそれぞれは、一対の電極に挟まれた有機層を備えた構造を有している。なお、ここでいう画素とは、表示領域61において所望の色の表示を可能とする最小単位を指している。本実施形態にかかる有機EL表示装置の場合、互いに異なる発光を示す第1発光素子62R、第2発光素子62G、第3発光素子62Bの組合せにより画素62が構成されている。画素62は、赤色発光素子と緑色発光素子と青色発光素子の組合せで構成されることが多いが、黄色発光素子とシアン発光素子と白色発光素子の組み合わせでもよく、少なくとも1色以上であれば特に制限されるものではない。
First, the organic EL display device to be manufactured will be described. 6A shows an overall view of the organic EL display device 60, and FIG. 6B shows a sectional structure of one pixel.
As shown in FIG. 6A, in the display area 61 of the organic EL display device 60, a plurality of pixels 62 having a plurality of light emitting elements are arranged in a matrix. Although details will be described later, each of the light emitting elements has a structure including an organic layer sandwiched between a pair of electrodes. It should be noted that the pixel here refers to a minimum unit that enables display of a desired color in the display area 61. In the case of the organic EL display device according to the present embodiment, the pixel 62 is configured by a combination of the first light emitting element 62R, the second light emitting element 62G, and the third light emitting element 62B that emit light different from each other. The pixel 62 is often composed of a combination of a red light emitting element, a green light emitting element, and a blue light emitting element, but may be a combination of a yellow light emitting element, a cyan light emitting element, and a white light emitting element. It is not limited.

図6(b)は、図6(a)のA−B線における部分断面模式図である。画素62は、基板63上に、第1電極(陽極)64と、正孔輸送層65と、発光層66R、66G、66Bのいずれかと、電子輸送層67と、第2電極(陰極)68と、を備える有機EL素子を有している。これらのうち、正孔輸送層65、発光層66R、66G、66B、電子輸送層67が有機層に当たる。また、本実施形態では、発光層66Rは赤色を発する有機EL層、発光層66Gは緑色を発する有機EL層、発光層66Bは青色を発する有機EL層である。発光層66R、66G、66Bは、それぞれ赤色、緑色、青色を発する発光素子(有機EL素子と記述する場合もある)に対応するパターンに形成されている。また、第1電極64は、発光素子ごとに分離して形成されている。正孔輸送層65と電子輸送層67と第2電極68は、複数の発光素子62R、62G、62Bと共通で形成されていてもよいし、発光素子毎に形成されていてもよい。なお、第1電極64と第2電極68とが異物によってショートするのを防ぐために、第1電極64間に絶縁層69が設けられている。さらに、有機EL層は水分や酸素によって劣化するため、水分や酸素から有機EL素子を保護するための保護層70が設けられている。 FIG. 6B is a schematic partial sectional view taken along the line AB of FIG. The pixel 62 includes a first electrode (anode) 64, a hole transport layer 65, any one of the light emitting layers 66R, 66G, and 66B, an electron transport layer 67, and a second electrode (cathode) 68 on a substrate 63. , And an organic EL element including. Among these, the hole transport layer 65, the light emitting layers 66R, 66G, 66B, and the electron transport layer 67 correspond to the organic layers. In the present embodiment, the light emitting layer 66R is an organic EL layer that emits red, the light emitting layer 66G is an organic EL layer that emits green, and the light emitting layer 66B is an organic EL layer that emits blue. The light-emitting layers 66R, 66G, and 66B are formed in patterns corresponding to light-emitting elements that emit red, green, and blue (sometimes described as organic EL elements). The first electrode 64 is formed separately for each light emitting element. The hole transport layer 65, the electron transport layer 67, and the second electrode 68 may be formed commonly to the plurality of light emitting elements 62R, 62G, and 62B, or may be formed for each light emitting element. An insulating layer 69 is provided between the first electrodes 64 in order to prevent the first electrode 64 and the second electrode 68 from being short-circuited by foreign matter. Furthermore, since the organic EL layer is deteriorated by water and oxygen, a protective layer 70 is provided to protect the organic EL element from water and oxygen.

図6(b)では正孔輸送層65や電子輸送層67が一つの層で示されているが、有機EL表示素子の構造によっては、正孔ブロック層や電子ブロック層を含む複数の層で形成されていてもよい。また、第1電極64と正孔輸送層65との間には第1電極64から正孔輸送層65への正孔の注入が円滑に行われるようにすることのできるエネルギーバンド構造を有する正孔注入層を形成することもできる。同様に、第2電極68と電子輸送層67の間にも電子注入層が形成されことができる。 In FIG. 6B, the hole transport layer 65 and the electron transport layer 67 are shown as one layer, but depending on the structure of the organic EL display element, a plurality of layers including the hole block layer and the electron block layer may be provided. It may be formed. Further, between the first electrode 64 and the hole transport layer 65, a positive band having an energy band structure capable of smoothly injecting holes from the first electrode 64 into the hole transport layer 65 is provided. It is also possible to form a hole injection layer. Similarly, an electron injection layer may be formed between the second electrode 68 and the electron transport layer 67.

次に、有機EL表示装置の製造方法の例について具体的に説明する。 Next, an example of the method for manufacturing the organic EL display device will be specifically described.

まず、有機EL表示装置を駆動するための回路(不図示)および第1電極64が形成された基板63を準備する。 First, a circuit 63 (not shown) for driving the organic EL display device and the substrate 63 on which the first electrode 64 is formed are prepared.

第1電極64が形成された基板63の上にアクリル樹脂をスピンコートで形成し、アクリル樹脂をリソグラフィ法により、第1電極64が形成された部分に開口が形成されるようにパターニングし絶縁層69を形成する。この開口部が、発光素子が実際に発光する発光領域に相当する。 An acrylic resin is formed by spin coating on the substrate 63 on which the first electrode 64 is formed, and the acrylic resin is patterned by a lithography method so that an opening is formed in a portion where the first electrode 64 is formed. 69 is formed. This opening corresponds to a light emitting region where the light emitting element actually emits light.

絶縁層69がパターニングされた基板63を第1の有機材料成膜装置に搬入し、静電チャック及び基板保持ユニットにて基板を保持し、正孔輸送層65を、表示領域の第1電極64の上に共通する層として成膜する。正孔輸送層65は真空蒸着により成膜される。実際には正孔輸送層65は表示領域61よりも大きなサイズに形成されるため、高精細なマスクは不要である。 The substrate 63 on which the insulating layer 69 is patterned is carried into the first organic material film-forming apparatus, the substrate is held by the electrostatic chuck and the substrate holding unit, and the hole transport layer 65 is attached to the first electrode 64 in the display area. Is formed as a common layer on. The hole transport layer 65 is formed by vacuum vapor deposition. Since the hole transport layer 65 is actually formed to have a size larger than that of the display region 61, a high-definition mask is unnecessary.

次に、正孔輸送層65までが形成された基板63を第2の有機材料成膜装置に搬入し、静電チャック及び基板保持ユニットにて保持する。基板とマスクとのアライメントを行い、基板をマスクの上に載置し、基板63の赤色を発する素子を配置する部分に、赤色を発する発光層66Rを成膜する。 Next, the substrate 63 on which the hole transport layer 65 has been formed is carried into the second organic material film forming apparatus and held by the electrostatic chuck and the substrate holding unit. The substrate and the mask are aligned, the substrate is placed on the mask, and the light emitting layer 66R that emits red light is formed on the portion of the substrate 63 where the element that emits red light is arranged.

発光層66Rの成膜と同様に、第3の有機材料成膜装置により緑色を発する発光層66Gを成膜し、さらに第4の有機材料成膜装置により青色を発する発光層66Bを成膜する。発光層66R、66G、66Bの成膜が完了した後、第5の成膜装置により表示領域61の全体に電子輸送層67を成膜する。電子輸送層67は、3色の発光層66R、66G、66Bに共通の層として形成される。 Similar to the film formation of the light emitting layer 66R, the light emitting layer 66G emitting green is formed by the third organic material film forming apparatus, and the light emitting layer 66B emitting blue is formed by the fourth organic material film forming apparatus. .. After the film formation of the light emitting layers 66R, 66G, 66B is completed, the electron transport layer 67 is formed over the entire display region 61 by the fifth film forming apparatus. The electron transport layer 67 is formed as a layer common to the three color light emitting layers 66R, 66G, and 66B.

電子輸送層67まで形成された基板を金属性蒸着材料成膜装置に移動させて第2電極68を成膜する。 The substrate on which the electron transport layer 67 has been formed is moved to the metallic vapor deposition material film forming device to form the second electrode 68.

本発明の実施形態によれば、有機EL表示素子の製造のために、多様な有機材料及び金属性材料を基板上に蒸着する装置において、基板を支持する基板保持ユニットの支持部材211、212、213、214の支持部材がお互いに異なる高さまたは支持力を持つので、基板保持ユニットの支持部によって支持された基板が静電チャックに吸着される際、基板がより平らに吸着され、蒸着工程全般的にその精度を向上させることができる。 According to an embodiment of the present invention, in an apparatus for depositing various organic materials and metallic materials on a substrate for manufacturing an organic EL display device, supporting members 211 and 212 of a substrate holding unit that supports the substrate, Since the supporting members 213 and 214 have different heights or supporting forces from each other, when the substrate supported by the supporting unit of the substrate holding unit is attracted to the electrostatic chuck, the substrate is attracted more flatly and the deposition process is performed. The accuracy can be improved overall.

その後プラズマCVD装置に移動して保護層70を成膜して、有機EL表示装置60が完成する。 After that, the organic EL display device 60 is completed by moving to a plasma CVD device to form a protective layer 70.

絶縁層69がパターニングされた基板63を成膜装置に搬入してから保護層70の成膜が完了するまでは、水分や酸素を含む雰囲気にさらしてしまうと、有機EL材料からなる発光層が水分や酸素によって劣化してしまうおそれがある。従って、本例において、成膜装置間の基板の搬入搬出は、真空雰囲気または不活性ガス雰囲気の下で行われる。 If the substrate 63 on which the insulating layer 69 is patterned is carried into the film forming apparatus until the film formation of the protective layer 70 is completed, if the substrate 63 is exposed to an atmosphere containing water and oxygen, the light emitting layer made of an organic EL material will be formed. It may be deteriorated by water or oxygen. Therefore, in this example, the loading and unloading of the substrate between the film forming apparatuses is performed in a vacuum atmosphere or an inert gas atmosphere.

上記実施形態は本発明の一例を示し、本発明は上記実施形態の構成に限定されないし、その技術思想の範囲内で適切に変形しても良い。 The above embodiment shows an example of the present invention, and the present invention is not limited to the configuration of the above embodiment, and may be appropriately modified within the scope of the technical idea thereof.

21:基板保持ユニット
22:マスク台
23:静電チャック
24:マグネット
30:基板支持面部
31:弾性体部
32:ガイド部
211:第1支持部材
212:第2支持部材
213:第3支持部材
214:第4支持部材

21: substrate holding unit 22: mask table 23: electrostatic chuck 24: magnet 30: substrate supporting surface portion 31: elastic body portion 32: guide portion 211: first supporting member 212: second supporting member 213: third supporting member 214 : Fourth support member

Claims (8)

マスクを介して基板に成膜を行うための成膜装置であって、A film forming apparatus for forming a film on a substrate through a mask,
前記基板の周縁部を支持するための支持部を含む基板保持ユニットと、A substrate holding unit including a supporting portion for supporting a peripheral portion of the substrate,
前記支持部の上方に設けられ、前記基板を吸着するための静電チャックとを含み、An electrostatic chuck provided above the support portion for attracting the substrate,
前記支持部は、第1方向に沿って配置される複数の第1支持部材と、複数の第1支持部材と対向するように前記第1方向に沿って配置される複数の第2支持部材と、前記第1方向と交差する第2方向に沿って配置される複数の第3支持部材と、前記複数の第3支持部材と対向するように前記第2方向に沿って配置される複数の第4支持部材とを含み、The support unit includes a plurality of first support members arranged along the first direction, and a plurality of second support members arranged along the first direction so as to face the plurality of first support members. A plurality of third supporting members arranged along a second direction intersecting the first direction, and a plurality of third supporting members arranged along the second direction so as to face the plurality of third supporting members. Including 4 support members,
前記第1支持部材の基板支持面及び前記第3支持部材の基板支持面の高さは、前記第2支持部材の基板支持面及び前記第4支持部材の基板支持面の高さより高いことを特徴とする成膜装置。The heights of the substrate supporting surface of the first supporting member and the substrate supporting surface of the third supporting member are higher than the heights of the substrate supporting surface of the second supporting member and the substrate supporting surface of the fourth supporting member. Film forming apparatus.
前記第1方向は前記基板の長辺方向と平行な方向であることを特徴とする請求項に記載の成膜装置。 The film forming apparatus according to claim 1 , wherein the first direction is a direction parallel to a long side direction of the substrate. 前記第1支持部材の前記基板支持面の高さと前記第2支持部材の前記基板支持面の高さとの差は、0.1mm以上1mm以下であることを特徴とする請求項1または2に記載の成膜装置。 The difference between the height of the substrate supporting surface of the height of the substrate supporting surface of the first support member and the second support member, according to claim 1 or 2, characterized in that a 0.1mm to 1mm Film deposition equipment. 前記第1支持部材及び前記第2支持部材は、前記第1支持部材の前記基板支持面及び前記第2支持部材の前記基板支持面が前記第1方向及び前記第1方向と交差する第2方向と交差する第3方向に前記基板保持ユニットに対して移動可能になるように前記基板保持ユニットに設けられることを特徴とする請求項のいずれか一項に記載の成膜装置。 The first support member and the second support member have a second direction in which the substrate support surface of the first support member and the substrate support surface of the second support member intersect the first direction and the first direction. film forming apparatus according to any one of claims 1 to 3, characterized in that provided on the substrate holding unit so as to be movable relative to the substrate holding unit in the third direction crossing the. 前記第1支持部材及び前記第2支持部材はそれぞれ、前記基板支持面を弾性的に支持する弾性部材を含むことを特徴とする請求項1〜のいずれか一項に記載の成膜装置。 Wherein each first supporting member and the second support member, the film forming apparatus according to any one of claims 1 to 4, characterized in that it comprises an elastic member supporting the substrate supporting surface elastically. 金属製の前記マスクを支持するために前記基板保持ユニットの下方に設けられるマスク台と、
前記静電チャックの上方に設けられ、前記マスクに磁力を印加して前記基板と前記マス
クを密着させるためのマグネットとをさらに含むことを特徴とする請求項1〜のいずれか一項に記載の成膜装置。
A mask table provided below the substrate holding unit for supporting the mask made of metal;
Wherein provided above the electrostatic chuck, according to any one of claims 1 to 5, characterized in that by applying a magnetic force to said mask further comprises a magnet for adhering the substrate and the mask Film deposition equipment.
有機EL表示装置の製造方法であって、
請求項1〜のいずれか一項に記載の成膜装置内に基板を搬入して前記基板保持ユニットの前記支持部に前記基板を置く工程と、
前記静電チャックにて前記基板保持ユニットの前記支持部上に置かれた前記基板の上面を吸着する工程と、
前記マスクを介して前記基板に蒸着材料を堆積させる成膜工程と、
蒸着材料が成膜された前記基板を前記成膜装置から搬出する工程と
を含み、
前記静電チャックにて前記基板の上面を吸着する前記工程では、前記基板の対向する二つの辺の中のいずれかの一つの辺に沿った基板周縁部が他の一つの辺に沿った基板周縁部より先に前記静電チャックに吸着されることを特徴とする有機EL表示装置の製造方法。
A method of manufacturing an organic EL display device, comprising:
A step of claim 1 and carrying a substrate into the film forming apparatus according to any one of 6 placing said substrate on said support portion of said substrate holding unit,
A step of adsorbing an upper surface of the substrate placed on the supporting portion of the substrate holding unit by the electrostatic chuck,
A film forming step of depositing a vapor deposition material on the substrate through the mask,
And carrying out the substrate on which the vapor deposition material is formed from the film forming apparatus,
In the step of attracting the upper surface of the substrate by the electrostatic chuck, the substrate peripheral portion along any one of the two opposing sides of the substrate is the substrate along the other one side. A method for manufacturing an organic EL display device, wherein the electrostatic chuck is attracted to the electrostatic chuck before the peripheral edge portion.
有機EL表示装置の製造方法であって、
請求項1〜6のいずれか一項に記載の成膜装置内に基板を搬入して前記基板保持ユニットの前記支持部に前記基板を置く工程と、
前記静電チャックにて、前記基板保持ユニットの前記支持部上に置かれた前記基板の上面を吸着する工程と、
前記マスクを介して前記基板に蒸着材料を堆積させる成膜工程と、
蒸着材料が成膜された前記基板を前記成膜装置から搬出する工程と
を含み、
前記静電チャックにて前記基板の上面を吸着する前記工程では、前記基板の対角線上の一角側の周縁部が反対側の角の周縁部より先に前記静電チャックに吸着されることを特徴とする有機EL表示装置の製造方法。
A method of manufacturing an organic EL display device, comprising:
Loading the substrate into the film forming apparatus according to any one of claims 1 to 6 and placing the substrate on the supporting portion of the substrate holding unit;
A step of adsorbing an upper surface of the substrate placed on the supporting portion of the substrate holding unit by the electrostatic chuck,
A film forming step of depositing a vapor deposition material on the substrate through the mask,
And carrying out the substrate on which the vapor deposition material is formed from the film forming apparatus,
In the step of attracting the upper surface of the substrate by the electrostatic chuck, a diagonal edge of the substrate on one diagonal side is attracted to the electrostatic chuck before a circumferential edge of the opposite corner. And a method for manufacturing an organic EL display device.
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