JP4043232B2 - Large pellicle - Google Patents

Large pellicle Download PDF

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Publication number
JP4043232B2
JP4043232B2 JP2001394167A JP2001394167A JP4043232B2 JP 4043232 B2 JP4043232 B2 JP 4043232B2 JP 2001394167 A JP2001394167 A JP 2001394167A JP 2001394167 A JP2001394167 A JP 2001394167A JP 4043232 B2 JP4043232 B2 JP 4043232B2
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Japan
Prior art keywords
frame
film
large pellicle
frame body
pellicle
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JP2001394167A
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Japanese (ja)
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JP2002296763A (en
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良勝 畑田
芳真 栗山
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Asahi Kasei EMD Corp
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Asahi Kasei EMD Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、IC(集積回路)、LSI(大規模集積回路)、TFTLCD(薄膜トランジスタ液晶ディスプレイ)等の半導体装置を製造する際のリソグラフィー工程で使用されるフォトマスクやレティクルに異物が付着することを防止するために用いられるペリクルに関するものである。
【0002】
【従来の技術】
従来、半導体回路パターン等の製造においては、フォトマスクやレティクルの両面側にペリクルと称する防塵手段を配置して該フォトマスクやレティクルへの異物の付着を防止することが行われている。
【0003】
ペリクルはフォトマスクやレティクルの形状に合わせた形状を有する厚さ数ミリ程度の枠体の一方の縁面にニトロセルロース或いはセルロース誘導体等の透明な高分子膜からなるペリクル膜を展張して接着し、且つ該枠体の他方の縁面にマスク粘着材を介してフォトマスクやレティクルの表面に貼着される。
【0004】
フォトマスクやレティクルの表面に異物が付着した場合、その異物が半導体ウェハ上に形成されたフォトレジスト上に結像して回路パターン欠陥の原因となるが、フォトマスクやレティクルにペリクルを配置した場合、ペリクルの表面に付着した異物はフォーカス位置のずれによって半導体ウェハ上に形成されたフォトレジスト上に結像することなく回路パターンに欠陥を生じさせないものである。
【0005】
従来のペリクル膜を展張して貼着支持する枠体は、直径5インチ(127mm)の半導体ウェハに応じた大きさで方形状に形成されたものが一般である。
【0006】
【発明が解決しようとする課題】
近年では各種のマルチメディアの普及により高画質、高精細表示が可能な大型のカラーTFTLCD(薄膜トランジスタ液晶ディスプレイ)のフォトリソグラフィ工程で使用される大型のフォトマスクに適用出来る大型ペリクルが要望されている。
【0007】
大型のTFTLCD(薄膜トランジスタ液晶ディスプレイ)等のフォトリソグラフィ工程で使用される大型のフォトマスクに適用出来る大型ペリクルの枠体としては、長辺と短辺を有する方形状のものが一般であるが、この枠体にペリクル膜を貼り付けると、該ペリクル膜の張力により特に長辺が枠体の内側に向かって撓み易く、この撓みによってフォトマスクの有効露光領域が小さくなってしまうという問題があり、大型ペリクル膜の展張面積が大きくなるにつれてその現象が顕著になる。
【0008】
本発明は前記課題を解決するものであり、その目的とするところは、大型ペリクル膜を展張して貼着支持する枠体を有する大型ペリクルであって、少なくとも一対の辺を枠体の外側に向かって突出するように形成したことで、該枠体の内側に向かう撓みを抑制してフォトマスクの有効露光領域を確保することが出来、更にはフォトマスクの良好な貼り付け性能を確保し得る大型ペリクルを提供せんとするものである。
【0009】
【課題を解決するための手段】
ペリクルに使用するマスク粘着材は枠体がペリクル膜の張力により略直線上に遷移しても皺が入らないように枠体の変形に追従することが望ましい。マスク粘着材に皺が入るとペリクルをフォトマスクに貼り付ける際にエアーパスが発生する虞が有る。
【0010】
また、枠体のペリクル膜が貼着される面と反対側の面にマスク粘着材によって貼着される保護フィルムもペリクル膜の張力による枠体の変形によってマスク粘着材から部分的にも剥がれないように枠体の変形に追従することが望ましい。
【0011】
以上の観点から完成された前記目的を達成するための本発明に係る大型ペリクルは、大型ペリクル膜を展張して貼着支持する一対の長辺と一対の短辺とからなる4辺の枠体を有する大型ペリクルであって、前記大型ペリクル膜が展張される前記枠体のうち少なくとも一対の長辺を該枠体の外側に向かって突出するように形成し、該枠体の一対の長辺が、これに貼着された前記大型ペリクル膜の張力により略直線状に遷移し、該大型ペリクル膜の膜厚が1μm以上、且つ10μm以下で且つ該大型ペリクル膜を展張する面積が1000 cm 2 以上で構成されたことを特徴とする
【0012】
枠体のうち少なくとも一対の長辺が枠体の外側に向かって突出するように形成され、該枠体に貼着された大型ペリクル膜の張力により略直線状に遷移するように設定されたことで、大型ペリクル膜の張力がかかった状態で枠体のうち少なくとも一対の長辺の内側への突出がなくなるためフォトマスクのサイズを大きくせずに有効露光面積を大きくすることが出来る
【0013】
また、大型ペリクル膜の膜厚を1μm以上、且つ10μm以下に設定したことで、大型ペリクル膜を展張する面積が1000 cm 2 以上で構成された場合であっても大型ペリクル膜の強度を維持することが出来る
【0014】
また、前記枠体の前記大型ペリクル膜が貼着される面と反対側の面には0.13N/cm2以上、且つ130.00N/cm2以下の圧縮硬さを有するマスク粘着材によって保護フィルムが貼着されたことを特徴とする。
【0015】
本発明は、上述の如く構成したので、大型ペリクル膜を展張する面積が1000cm2以上であることから大型のTFTLCD(薄膜トランジスタ液晶ディスプレイ)のフォトリソグラフィ工程で使用される大型のフォトマスクに適用出来る大型ペリクルとして利用することが出来る。
【0016】
また、枠体の一対の辺を該枠体の外側に向かって突出するように形成したことで、大型ペリクル膜の張力による該長辺の枠体の内側に向かう撓みを抑制してフォトマスクの有効露光領域を確保することが出来る。
【0017】
また、枠体の大型ペリクル膜が貼着される面と反対側の面に所定の圧縮硬さを有するマスク粘着材によって保護フィルムが貼着された場合には保護フィルムによりマスク粘着材を保護することが出来、フォトマスクへの良好な貼り付け性能を確保することが出来る。
【0018】
また、前記マスク粘着材の厚みが0.2mm以上、且つ3mm以下で、且つ該マスク粘着材の圧縮硬さが、0.13N/cm2以上、且つ130.00N/cm2以下、好ましくは0.13N/cm2以上、且つ13.00N/cm2以下であれば枠体の変形によりマスク粘着材に皺等の変形が生じることがなく、フォトマスクへの良好な貼り付け性能を確保することが出来る。尚、マスク粘着材の幅は枠体の幅以下でホットメルト、両面テープ等の材質が適用可能である。
【0019】
また、前記保護フィルムの厚みが25μm以上、且つ1mm以下で、且つ該保護フィルムの弾性率が0.5GPa以上、且つ50GPa以下であれば枠体の変形により保護フィルムに皺等の変形が生じることがなく、フォトマスクへの良好な貼り付け性能を確保することが出来る。
【0020】
また、保護フィルムはマスク粘着材の幅以上或いは枠体サイズ以上の大きさのPET(ポリエチレンテレフタレート)等の材質が適用可能であり、保護フィルムはマスク粘着材の全表面を含む枠体の全面を覆う場合でも良いし、マスク粘着材の全表面のみを覆う場合でも良い。
【0021】
【発明の実施の形態】
図により本発明に係る大型ペリクルの一実施形態を具体的に説明する。図1は本発明に係る大型ペリクルの枠体の構成を示す斜視図、図2は本発明に係る大型ペリクルの第1実施形態の構成を示す平面図及び側面図、図3は本発明に係る大型ペリクルの第2実施形態の構成を示す平面図及び側面図、図4は枠体に大型ペリクル膜が貼着されて長辺が略直線状に遷移した様子を示す図である。
【0022】
図1〜図4において、1は膜厚が1μm以上、且つ10μm以下のニトロセルロースやセルロース誘導体等の透明な高分子膜で構成される大型ペリクル膜(以下、単に「ペリクル膜」という)2を展張して貼着支持するアルミニウムやその合金、或いは鉄や鉄系合金等により構成される大型ペリクル枠体(以下、単に「枠体」という)である。
【0023】
枠体1は一対の長辺1aと一対の短辺1bとからなる4辺を有しており、長辺1a及び短辺1bは所定の幅寸法と、互いに等しい所定の高さ寸法と、互いに異なる所定の長さ寸法とを夫々有して構成されている。枠体1の長辺1a及び短辺1bの一方の面には該枠体1の全体に亘って平坦面で構成され、ペリクル膜2を貼着するための貼着面1a1,1b1が形成されている。
【0024】
枠体1のペリクル膜2を展張する面積は1000cm2以上で構成され、該枠体1の一対の長辺1aは枠体1の外側に向かって突出するように形成されている。本実施形態では、枠体1の一対の長辺1aは所定の曲率を有して外側に向かって湾曲突出したものであるが、楕円形状や放物線形状、或いは他の各種形状で突出させても良い。
【0025】
このように大型ペリクル膜2を展張する面積が1000cm2以上であることから大型のTFTLCD(薄膜トランジスタ液晶ディスプレイ)のフォトリソグラフィ工程で使用される大型のフォトマスクに適用出来る大型ペリクルとして利用することが出来る。
【0026】
図2及び図3に示すように、枠体1のペリクル膜2が貼着される貼着面1a1,1b1と反対側の面には圧縮硬さが0.13N/cm2以上、且つ130.00N/cm2以下に設定されたマスク粘着材3が枠体1の長辺1a及び短辺1bの夫々の幅以下の幅で、且つ0.2mm以上、且つ3mm以下の厚みで塗布され、該マスク粘着材3によって、厚みが25μm以上、且つ1mm以下で、且つ弾性率が0.5GPa以上、且つ50GPa以下に設定された保護フィルム4が貼着されている。
【0027】
マスク粘着材3はホットメルト、両面テープ等の材質が適用可能である。
【0028】
また、保護フィルム4はマスク粘着材3の幅以上或いは枠体1の外形以上の大きさを有するPET(ポリエチレンテレフタレート)等が適用可能であり、保護フィルム4は、図2に示すように、マスク粘着材3の全表面を含む枠体1の全面を覆う略方形状の場合でも良いし、図3に示すように、マスク粘着材3の全表面のみを覆う枠形状の場合でも良い。
【0029】
枠体1のペリクル膜2が貼着される貼着面1a1,1b1と反対側の面に所定の圧縮硬さを有するマスク粘着材3によって保護フィルム4が貼着された場合には、該保護フィルム4によりマスク粘着材3を保護することが出来、フォトマスクへの良好な貼り付け性能を確保することが出来る。
【0030】
上述のように、マスク粘着材3を介して保護フィルム4が貼着された枠体1は、図4に示すように、枠体1の長辺1a及び短辺1bの貼着面1a1,1b1に接着剤が塗布されてペリクル膜2が展張して貼着される。
【0031】
枠体1の貼着面1a1,1b1に貼着されたペリクル膜2の張力は、特に長辺1aが枠体1の内側に向かって撓みが発生するように作用するが、枠体1の一対の長辺1aを該枠体1の外側に向かって突出するように形成したことで、該長辺1aの枠体1の内側に向かう撓みを抑制して上記大型ペリクルが取り付けられる図示しないフォトマスクの有効露光領域を確保することが出来る。
【0032】
また、図4に示すように、枠体1の外側に向かって突出するように形成された一対の長辺1aが該枠体1の貼着面1a1,1b1に貼着されたペリクル膜2の張力により略直線状に遷移するように設定された場合には、ペリクル膜2の張力がかかった状態で枠体1の一対の長辺1aの内側への突出がなくなるためフォトマスクのサイズを大きくせずに有効露光面積を大きくすることが出来る。
【0033】
枠体1の外側に向かって突出するように形成された一対の長辺1aがペリクル膜2の張力により略直線状に遷移する一例として、枠体1の材質としてアルミニウム合金を使用し、長辺1a及び短辺1bの断面形状が幅7mm、高さ4.3mmの方形状で、一対の短辺1bの長さが348mm、一対の長辺1aの長さが582mm、該長辺1aの中央部の突出量を1mmとし、ペリクル膜2の材質としてセルロース系ポリマーを使用し、その膜厚を4μmとした場合、枠体1の貼着面1a1,1b1にペリクル膜2を貼着した後の該ペリクル膜2の張力により略直線状に遷移した長辺1aの中央部の最大突出量が0.1〜0.2mmであった。
【0034】
上述のように、マスク粘着材3の厚みが0.2mm以上、且つ3mm以下で、且つ該マスク粘着材3の圧縮硬さが0.13N/cm2以上、且つ130.00N/cm2以下であれば、図4に示す枠体1の変形によりマスク粘着材3に皺等の変形が生じることがなく、フォトマスクへの良好な貼り付け性能を確保することが出来る。
【0035】
前述のマスク粘着材3の圧縮硬さの測定に当っては、「JISK6767」の測定方法に基づいて、次の条件で実施した。
試験片サイズ:t25mm×50mm□
※材料のフォームの厚みがt0.8mmであるために、JISで認められている
内容に従って25mmの厚みに達するまで積層した。
圧縮条件:10mm/secのスピードで厚みの25%まで圧縮
測定方法:25%まで圧縮し20秒止めた際の荷重を測定
【0036】
また、保護フィルム4の厚みが25μm以上、且つ1mm以下で、且つ該保護フィルム4の弾性率が0.5GPa以上、且つ50GPa以下であれば枠体1の変形により保護フィルム4に皺等の変形が生じることがなく、フォトマスクへの良好な貼り付け性能を確保することが出来る。
【0037】
また、ペリクル膜2の膜厚を1μm以上、且つ10μm以下に設定したことで、ペリクル膜2を展張する面積が1000cm2以上で構成された場合であってもペリクル膜2の強度を維持することが出来る。
【0038】
尚、前記各実施形態では、長辺1aと短辺1bとを有する略方形状の枠体1を有して構成された大型ペリクルの一例について説明したが、4辺が略等しい略正方形の枠体1を有する大型ペリクルについても同様に適用することが出来る。
【0039】
この場合、枠体1のうち少なくとも一対の辺を該枠体1の外側に向かって突出るように形成すれば良く、対向する2辺を枠体1の外側に向かって突出るように形成しても良いし、4辺全てを枠体1の外側に向かって突出するように形成しても良い。
【0040】
また、前述の略方形状の枠体1の場合において、長辺1a及び短辺1bの4辺全てを枠体1の外側に向かって突出るように形成しても良い。
【0041】
【発明の効果】
本発明は、上述の如き構成と作用とを有するので、大型ペリクル膜を展張する面積が1000cm2以上であることから大型のTFTLCD(薄膜トランジスタ液晶ディスプレイ)のフォトリソグラフィ工程で使用される大型のフォトマスクに適用出来る大型ペリクルとして利用することが出来る。
【0042】
また、枠体の一対の長辺を該枠体の外側に向かって突出するように形成したことで、大型ペリクル膜の張力による該長辺の枠体の内側に向かう撓みを抑制してフォトマスクの有効露光領域を確保することが出来る。
【0043】
また、前記枠体の一対の長辺が該枠体に貼着された大型ペリクル膜の張力により略直線状に遷移するように設定された場合には、大型ペリクル膜の張力がかかった状態で枠体の一対の長辺の内側への突出がなくなるためフォトマスクのサイズを大きくせずに有効露光面積を大きく出来る。
【0044】
また、大型ペリクル膜の張力により枠体が変形しても、その枠体の変形によりマスク粘着材に皺等の変形が生じることが無いためフォトマスクへの良好な貼り付け性能を維持することが出来る。
【図面の簡単な説明】
【図1】 本発明に係る大型ペリクルの枠体の構成を示す斜視図である。
【図2】 本発明に係る大型ペリクルの第1実施形態の構成を示す平面図及び側面図である。
【図3】 本発明に係る大型ペリクルの第2実施形態の構成を示す平面図及び側面図である。
【図4】 枠体に大型ペリクル膜が貼着されて長辺が略直線状に遷移した様子を示す図である。
【符号の説明】
1…枠体
1a…長辺
1b…短辺
1a1,1b1…貼着面
2…ペリクル膜
3…マスク粘着材
4…保護フィルム
[0001]
BACKGROUND OF THE INVENTION
In the present invention, foreign matter adheres to a photomask or a reticle used in a lithography process when manufacturing a semiconductor device such as an IC (integrated circuit), LSI (large scale integrated circuit), TFTLCD (thin film transistor liquid crystal display). The present invention relates to a pellicle used for prevention.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in the manufacture of semiconductor circuit patterns and the like, dust prevention means called a pellicle is disposed on both sides of a photomask or reticle to prevent foreign matter from adhering to the photomask or reticle.
[0003]
The pellicle has a shape matching the shape of a photomask or reticle, and a pellicle film made of a transparent polymer film such as nitrocellulose or a cellulose derivative is stretched and bonded to one edge surface of a frame having a thickness of several millimeters. And it is affixed on the surface of a photomask or a reticle via a mask adhesive material on the other edge surface of the frame.
[0004]
When foreign matter adheres to the surface of a photomask or reticle, the foreign matter forms an image on the photoresist formed on the semiconductor wafer and causes circuit pattern defects. However, when a pellicle is placed on the photomask or reticle. The foreign matter adhering to the surface of the pellicle does not cause a defect in the circuit pattern without forming an image on the photoresist formed on the semiconductor wafer due to the shift of the focus position.
[0005]
A conventional frame body that stretches and supports a pellicle film is generally formed in a rectangular shape with a size corresponding to a semiconductor wafer having a diameter of 5 inches (127 mm).
[0006]
[Problems to be solved by the invention]
In recent years, there has been a demand for a large pellicle applicable to a large photomask used in a photolithography process of a large color TFT LCD (Thin Film Transistor Liquid Crystal Display) capable of high image quality and high definition display due to the spread of various multimedia.
[0007]
As a frame of a large pellicle applicable to a large photomask used in a photolithography process such as a large TFTLCD (thin film transistor liquid crystal display), a rectangular body having a long side and a short side is generally used. When the pellicle film is attached to the frame body, the long side tends to bend toward the inside of the frame body due to the tension of the pellicle film, and there is a problem that the effective exposure area of the photomask is reduced by this bending. This phenomenon becomes more prominent as the stretched area of the pellicle film increases.
[0008]
The present invention solves the above-mentioned problems, and an object of the present invention is a large-sized pellicle having a frame body that expands and supports a large-sized pellicle film, and at least a pair of sides are outside the frame body. By forming so as to protrude toward the inside, it is possible to secure the effective exposure area of the photomask by suppressing the bending toward the inside of the frame body, and further, it is possible to ensure the good adhesion performance of the photomask. It is intended to provide a large pellicle.
[0009]
[Means for Solving the Problems]
It is desirable that the mask adhesive used for the pellicle should follow the deformation of the frame so that no wrinkles will occur even if the frame transitions on a substantially straight line due to the tension of the pellicle film. If wrinkles enter the mask adhesive material, an air path may occur when the pellicle is attached to the photomask.
[0010]
In addition, the protective film that is attached to the surface of the frame opposite to the surface to which the pellicle film is attached by the mask adhesive material is not partially peeled off from the mask adhesive material due to the deformation of the frame due to the tension of the pellicle film. Thus, it is desirable to follow the deformation of the frame.
[0011]
The large-sized pellicle according to the present invention for achieving the above-described object completed from the above viewpoint is a four-sided frame body composed of a pair of long sides and a pair of short sides for expanding and sticking the large-sized pellicle film. A pair of long sides of the frame body, wherein at least a pair of long sides of the frame body on which the large pellicle film is stretched are projected toward the outside of the frame body. However, the film transitions in a substantially linear shape by the tension of the large pellicle film adhered thereto, and the film thickness of the large pellicle film is 1 μm or more and 10 μm or less, and the area where the large pellicle film is stretched is 1000 cm 2. It is characterized by the above .
[0012]
It was formed so that at least one pair of long sides of the frame body protrudes toward the outside of the frame body, and was set so as to transition to a substantially linear shape by the tension of the large pellicle film attached to the frame body. Thus, since the protrusion to the inside of at least one pair of long sides of the frame body is eliminated in a state where the tension of the large pellicle film is applied, the effective exposure area can be increased without increasing the size of the photomask .
[0013]
Further, by setting the film thickness of the large pellicle film to 1 μm or more and 10 μm or less, the strength of the large pellicle film is maintained even when the area where the large pellicle film is extended is 1000 cm 2 or more. I can do it .
[0014]
Further, the surface of the frame opposite to the surface to which the large pellicle film is attached is protected by a mask adhesive material having a compression hardness of 0.13 N / cm 2 or more and 130.00 N / cm 2 or less. It is characterized in that a film is attached.
[0015]
Since the present invention is configured as described above, the area on which the large pellicle film is stretched is 1000 cm 2 or more, so that it can be applied to a large photomask used in the photolithography process of a large TFTLCD (Thin Film Transistor Liquid Crystal Display). It can be used as a pellicle.
[0016]
In addition, by forming the pair of sides of the frame so as to protrude toward the outside of the frame, it is possible to suppress bending toward the inside of the frame of the long side due to the tension of the large pellicle film. An effective exposure area can be secured.
[0017]
In addition, when a protective film is attached to the surface of the frame opposite to the surface to which the large pellicle film is attached by a mask adhesive material having a predetermined compression hardness, the mask adhesive material is protected by the protective film. Therefore, it is possible to secure a good pasting performance to the photomask.
[0018]
Further, the thickness of the mask adhesive material is 0.2 mm or more and 3 mm or less, and the compression hardness of the mask adhesive material is 0.13 N / cm 2 or more and 130.00 N / cm 2 or less, preferably 0. If it is .13 N / cm 2 or more and 13.00 N / cm 2 or less, the deformation of the frame will not cause wrinkles or the like in the mask adhesive material, and ensure good adhesion performance to the photomask. I can do it. The width of the mask adhesive material is less than the width of the frame, and materials such as hot melt and double-sided tape are applicable.
[0019]
Moreover, if the thickness of the protective film is 25 μm or more and 1 mm or less and the elastic modulus of the protective film is 0.5 GPa or more and 50 GPa or less, deformation of the protective film may occur due to deformation of the frame. Therefore, it is possible to ensure good attachment performance to the photomask.
[0020]
Further, the protective film can be made of a material such as PET (polyethylene terephthalate) that is larger than the width of the mask adhesive material or larger than the frame size, and the protective film covers the entire surface of the frame including the entire surface of the mask adhesive material. The case where it covers may be sufficient, and the case where only the whole surface of a mask adhesive material is covered may be sufficient.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a large pellicle according to the present invention will be specifically described with reference to the drawings. 1 is a perspective view showing the configuration of a frame of a large pellicle according to the present invention, FIG. 2 is a plan view and a side view showing the configuration of a first embodiment of the large pellicle according to the present invention, and FIG. 3 is according to the present invention. FIGS. 4A and 4B are a plan view and a side view showing the configuration of the second embodiment of the large pellicle, and FIG. 4 is a diagram showing a state in which the large pellicle film is attached to the frame and the long side is changed to a substantially linear shape.
[0022]
1 to 4, reference numeral 1 denotes a large pellicle film (hereinafter simply referred to as “pellicle film”) 2 composed of a transparent polymer film such as nitrocellulose or a cellulose derivative having a film thickness of 1 μm or more and 10 μm or less. A large pellicle frame body (hereinafter simply referred to as “frame body”) made of aluminum, an alloy thereof, iron, an iron-based alloy, or the like that is stretched and stuck and supported.
[0023]
The frame 1 has four sides including a pair of long sides 1a and a pair of short sides 1b. The long sides 1a and the short sides 1b have a predetermined width dimension, a predetermined height dimension equal to each other, and Each has a different predetermined length dimension. On one surface of the long side 1a and the short side 1b of the frame body 1, a flat surface is formed over the entire frame body 1, and bonding surfaces 1a1 and 1b1 for bonding the pellicle film 2 are formed. ing.
[0024]
The area of the frame 1 on which the pellicle film 2 is extended is configured to be 1000 cm 2 or more, and the pair of long sides 1 a of the frame 1 are formed so as to protrude toward the outside of the frame 1. In the present embodiment, the pair of long sides 1a of the frame body 1 has a predetermined curvature and protrudes in a curved manner toward the outside, but may be protruded in an elliptical shape, a parabolic shape, or other various shapes. good.
[0025]
Thus, since the area where the large pellicle film 2 is extended is 1000 cm 2 or more, it can be used as a large pellicle applicable to a large photomask used in the photolithography process of a large TFTLCD (Thin Film Transistor Liquid Crystal Display). .
[0026]
As shown in FIG. 2 and FIG. 3, the compression hardness is 0.13 N / cm 2 or more on the surface opposite to the attachment surfaces 1a1, 1b1 to which the pellicle film 2 of the frame 1 is attached, and 130. A mask adhesive material 3 set to 00 N / cm 2 or less is applied with a width less than the width of each of the long side 1a and the short side 1b of the frame 1 and a thickness of 0.2 mm or more and 3 mm or less, A protective film 4 having a thickness of 25 μm or more and 1 mm or less and an elastic modulus of 0.5 GPa or more and 50 GPa or less is attached by the mask adhesive material 3.
[0027]
The mask adhesive material 3 can be made of a material such as hot melt or double-sided tape.
[0028]
Further, as the protective film 4, PET (polyethylene terephthalate) having a size larger than the width of the mask adhesive material 3 or larger than the outer shape of the frame body 1 can be applied. As shown in FIG. A substantially rectangular shape covering the entire surface of the frame 1 including the entire surface of the adhesive material 3 may be used, or a frame shape covering only the entire surface of the mask adhesive material 3 as shown in FIG.
[0029]
When the protective film 4 is attached to the surface opposite to the attachment surfaces 1a1 and 1b1 to which the pellicle film 2 of the frame 1 is attached by the mask adhesive material 3 having a predetermined compression hardness, the protection The mask adhesive material 3 can be protected by the film 4, and good adhesion performance to the photomask can be ensured.
[0030]
As described above, the frame 1 to which the protective film 4 is bonded via the mask adhesive material 3 has the bonding surfaces 1a1 and 1b1 of the long side 1a and the short side 1b of the frame 1 as shown in FIG. An adhesive is applied to the pellicle film 2 so that the pellicle film 2 is stretched and attached.
[0031]
The tension of the pellicle film 2 attached to the attachment surfaces 1a1 and 1b1 of the frame body 1 acts in particular so that the long side 1a is bent toward the inside of the frame body 1. The photomask (not shown) to which the large pellicle is attached while suppressing the bending of the long side 1a toward the inside of the frame 1 is formed by projecting the long side 1a toward the outside of the frame 1 The effective exposure area can be secured.
[0032]
Further, as shown in FIG. 4, a pellicle film 2 in which a pair of long sides 1 a formed so as to protrude toward the outside of the frame body 1 is attached to the attachment surfaces 1 a 1 and 1 b 1 of the frame body 1. When it is set so as to make a transition to a substantially straight line due to the tension, there is no protrusion of the frame 1 inside the pair of long sides 1a with the tension of the pellicle film 2 applied, so the size of the photomask is increased. Without increasing the effective exposure area.
[0033]
As an example in which a pair of long sides 1a formed so as to protrude toward the outside of the frame body 1 transitions substantially linearly due to the tension of the pellicle film 2, an aluminum alloy is used as the material of the frame body 1, and the long sides The cross-sectional shape of 1a and the short side 1b is a rectangular shape having a width of 7 mm and a height of 4.3 mm, the length of the pair of short sides 1b is 348 mm, the length of the pair of long sides 1a is 582 mm, and the center of the long side 1a If the protruding amount of the part is 1 mm, the cellulosic polymer is used as the material of the pellicle film 2 and the film thickness is 4 μm, the pellicle film 2 is attached to the attachment surfaces 1a1 and 1b1 of the frame 1 The maximum protrusion amount of the central portion of the long side 1a that was changed to a substantially linear shape by the tension of the pellicle film 2 was 0.1 to 0.2 mm.
[0034]
As described above, the thickness of the mask adhesive material 3 is 0.2 mm or more and 3 mm or less, and the compression hardness of the mask adhesive material 3 is 0.13 N / cm 2 or more and 130.00 N / cm 2 or less. If there is, deformation of the mask adhesive material 3 due to deformation of the frame body 1 shown in FIG. 4 does not occur, and good bonding performance to the photomask can be ensured.
[0035]
Measurement of the compression hardness of the mask adhesive material 3 described above was carried out under the following conditions based on the measurement method of “JISK6767”.
Test piece size: t25mm × 50mm □
* Since the thickness of the foam of the material is t0.8mm, it was laminated until the thickness reached 25mm according to the content approved by JIS.
Compression condition: Compression at a speed of 10 mm / sec up to 25% of the thickness Measurement method: Measure the load when compressed to 25% and stopped for 20 seconds
If the thickness of the protective film 4 is 25 μm or more and 1 mm or less and the elastic modulus of the protective film 4 is 0.5 GPa or more and 50 GPa or less, the deformation of the frame 1 causes deformation of the protective film 4 such as wrinkles. Therefore, it is possible to ensure good attachment performance to a photomask.
[0037]
Further, by setting the film thickness of the pellicle film 2 to 1 μm or more and 10 μm or less, the strength of the pellicle film 2 can be maintained even when the area where the pellicle film 2 is stretched is 1000 cm 2 or more. I can do it.
[0038]
In each of the above embodiments, an example of a large pellicle having a substantially rectangular frame 1 having a long side 1a and a short side 1b has been described. However, a substantially square frame having substantially the same four sides. The same applies to a large pellicle having the body 1.
[0039]
In this case, at least a pair of sides of the frame body 1 may be formed so as to protrude toward the outside of the frame body 1, and two opposing sides are formed so as to protrude toward the outside of the frame body 1. Alternatively, all four sides may be formed so as to protrude toward the outside of the frame body 1.
[0040]
In the case of the substantially rectangular frame 1 described above, all four sides of the long side 1 a and the short side 1 b may be formed so as to protrude toward the outside of the frame 1.
[0041]
【The invention's effect】
Since the present invention has the above-described configuration and operation, the area for extending the large pellicle film is 1000 cm 2 or more, and therefore, it can be used as a large photomask used in the photolithography process of a large TFT LCD (Thin Film Transistor Liquid Crystal Display). It can be used as an applicable large pellicle.
[0042]
Further, by forming the pair of long sides of the frame so as to protrude toward the outside of the frame, it is possible to suppress bending toward the inside of the frame of the long side due to the tension of the large pellicle film. The effective exposure area can be secured.
[0043]
In addition, when the pair of long sides of the frame body is set so as to change in a substantially linear shape by the tension of the large pellicle film attached to the frame body, the tension of the large pellicle film is applied. Since there is no protrusion to the inside of the pair of long sides of the frame, the effective exposure area can be increased without increasing the size of the photomask.
[0044]
In addition, even if the frame is deformed by the tension of the large pellicle film, the deformation of the frame does not cause deformation such as wrinkles in the mask adhesive material, so that it is possible to maintain good adhesion performance to the photomask. I can do it.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a configuration of a frame of a large pellicle according to the present invention.
FIGS. 2A and 2B are a plan view and a side view showing a configuration of a first embodiment of a large pellicle according to the present invention. FIGS.
FIG. 3 is a plan view and a side view showing a configuration of a second embodiment of a large pellicle according to the present invention.
FIG. 4 is a view showing a state in which a large pellicle film is attached to a frame and its long side is changed to a substantially linear shape.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Frame 1a ... Long side 1b ... Short side
1a1, 1b1 ... Sticking surface 2 ... Pellicle film 3 ... Mask adhesive 4 ... Protective film

Claims (4)

大型ペリクル膜を展張して貼着支持する一対の長辺と一対の短辺とからなる4辺の枠体を有する大型ペリクルであって、
前記大型ペリクル膜が展張される前記枠体のうち少なくとも一対の長辺を該枠体の外側に向かって突出するように形成し、該枠体の一対の長辺が、これに貼着された前記大型ペリクル膜の張力により略直線状に遷移し、該大型ペリクル膜の膜厚が1μm以上、且つ10μm以下で且つ該大型ペリクル膜を展張する面積が1000cm2以上で構成されたことを特徴とする大型ペリクル。
A large pellicle having a four-sided frame body composed of a pair of long sides and a pair of short sides for spreading and supporting a large pellicle film,
At least a pair of long sides of the frame body on which the large pellicle film is stretched are formed so as to protrude toward the outside of the frame body, and the pair of long sides of the frame body are adhered to the frame body. The large pellicle film is changed to a substantially linear shape by the tension, and the large pellicle film has a thickness of 1 μm or more and 10 μm or less, and an area where the large pellicle film is extended is 1000 cm 2 or more. A large pellicle.
記枠体の前記大型ペリクル膜が貼着される面と反対側の面には0.13N/cm2以上、且つ130.00N/cm2以下の圧縮硬さを有するマスク粘着材によって保護フィルムが貼着されたことを特徴とする請求項1に記載の大型ペリクル。Protective film by a mask adhesive having the large pellicle film on the surface opposite to the surface to be adhered 0.13 N / cm 2 or more, and 130.00N / cm 2 or less of compressive hardness before Symbol frame The large pellicle according to claim 1, wherein is attached. 前記マスク粘着材の厚みが0.2mm以上、且つ3mm以下であることを特徴とする請求項に記載の大型ペリクル。The large pellicle according to claim 2 , wherein the mask adhesive material has a thickness of 0.2 mm or more and 3 mm or less. 前記保護フィルムの厚みが25μm以上、且つ1mm以下で、且つ該保護フィルムの弾性率が0.5GPa以上、且つ50GPa以下であることを特徴とする請求項2又は請求項3に記載の大型ペリクル。The large pellicle according to claim 2 or 3 , wherein the protective film has a thickness of 25 µm or more and 1 mm or less, and an elastic modulus of the protective film is 0.5 GPa or more and 50 GPa or less.
JP2001394167A 2001-01-26 2001-12-26 Large pellicle Expired - Fee Related JP4043232B2 (en)

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