JP2004039721A - Wafer carrier housing - Google Patents

Wafer carrier housing Download PDF

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Publication number
JP2004039721A
JP2004039721A JP2002191839A JP2002191839A JP2004039721A JP 2004039721 A JP2004039721 A JP 2004039721A JP 2002191839 A JP2002191839 A JP 2002191839A JP 2002191839 A JP2002191839 A JP 2002191839A JP 2004039721 A JP2004039721 A JP 2004039721A
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JP
Japan
Prior art keywords
wafer
carrier case
wafer carrier
groove
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2002191839A
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Japanese (ja)
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JP4256122B2 (en
Inventor
Takeshi Kuroda
黒田 武
Tomohisa Kimura
木村 朋央
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Seiko Instruments Inc
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Seiko Instruments Inc
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Priority to JP2002191839A priority Critical patent/JP4256122B2/en
Publication of JP2004039721A publication Critical patent/JP2004039721A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To improve the in-plane uniformity of the surface state, rear surface state and side surface state of a wafer, and uniformity between the wafers, to suppress a decreases in yield while keeping the strength of a carrier not to damage the wafer, when cleaning, wet etching, and drying the wafer housed in a carrier housing. <P>SOLUTION: In the wafer carrier housing formed such that a plurality of grooves supported by a set of opposed groove supporting parts are formed in a opposed manner and at intervals, a part of slit parts of an upper stage and a lower stage of the wafer supporting part provided on the side of the housing having each opposed groove is removed and the wafer support in a mid stage remains. The height of each opposed groove of the wafer support in the mid stage from the housing side is low. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ウエハを収納するウエハキャリアケースに関するものである。
【0002】
【従来の技術】
図1に従来のウエハキャリアケース10の平面図を示す。図中のC−C線断面図を図2に、図中のE−E線断面図を図3に示す。従来のウエハキャリアケース10の筐体1の両側壁2、2に対抗する一組の溝2aが複数設けられている。溝2aは、ウエハ100を案内するものである。側壁2は、垂直な壁である垂直壁と、ウエハ100を受ける斜めの壁である斜め壁にて形成されている。なお、筐体1の底部は、開口されている。更に、垂直壁と斜め壁の各溝2aには、それぞれ対向する位置に開口スリット4が設けられている。この各溝2aの溝幅はウエハ100の厚さはおよそ6倍程度の寸法に形成されている。上部の開口スリット4は、側壁2の垂直壁とウエハ100の接する位置の上部とその下部に設けられている。下部の開口スリット4は、垂直壁と斜め壁に連なって形成されており、斜め壁とウエハ100とが接する位置の手前まで形成されている。
【0003】
また、開口スリット4は、エッチング等する際に、エッチング液等を速やかに排除するものである。
【0004】
【発明が解決しようとする課題】
しかしながら、上記従来の構造の図1乃至3に示すウエハキャリアケース10では、ウエハ100をウエハキャリアケース10に収納し洗浄またはウェットエッチする際に、ウエハ100がキャリアケース10の壁2の上段部である垂直壁側と斜め壁側との接触、またはウエハ100端部が溝2aの溝壁7の影になることにより、ウエハ100の表面、裏面、側面の洗浄を不均一にし、歩留まり低下や、ウエハ表面状態を不均一にし、膜ムラ等の異常の原因となる。
【0005】
細かい開口スリット4にてもウエハキャリアケース10内と外側とが繋がっているが、細かいためエッチング液等の速やかな導入・排出が困難であり、上に記載の課題が存在する。
【0006】
本発明は、上記問題を生じる事無くウエハをウエハキャリアケースに収納し、洗浄またはウェットエッチングまたは乾燥する際に、ウエハキャリアケース内のウエハの洗浄またはエッチングまたは乾燥を均一にすることによりウエハ表面状態または裏面状態の均一性を向上させ、製品の歩留まり低下を抑制することを目的とする。
【0007】
【課題を解決するための手段】
本願発明は、筐体における対向する一組の溝支持部により支持される複数の溝を対向する状態にかつ等間隔に形成したウエハキャリアケースにおいて、前記対向する各溝のある側壁のうち、側壁の溝とウエハとが接する部分の側壁部の一部に、溝2aの溝壁7を取り除いた、大きな開口部を設けるものである。各溝2aに設けられた開口部がそれぞれ繋がっていることである。
【0008】
【発明の実施の形態】
図4及び図5は、本発明のウエハキャリアケース10の側断面図および縦断面図である。図4、5に示すように筐体の外形は、従来のものとほぼ同一である。図5に示すように図3に於ける上段及び下段の開口スリット4部の溝支持部2及び溝壁7は取り除かれた形状になっている。つまり、筐体の片側には上下2段の連続開口部4aが設けられている。つまり両側に4つ設けられている。尚筐体の天井及び底も開口されている。
【0009】
図4、5に示すように、筐体1の上下段側の溝支持部2、2(溝4、溝壁7)は取り除かれ、それぞれの隣り合う開口スリット4は一体化され、片側側壁に上下2つの開口部4aとして形成されている。残された溝壁7は、上段溝壁7Xと中段溝壁7Zと下段溝壁7Yに分断されることになる。勿論各溝壁7X、7Z、7Yにはそれぞれ溝4X、4Z、4Yが設けられることになる。更に、各溝壁7X、7Z、7Yの図5における上下方向は、各開口部4aに重なるように突出している。
【0010】
ここで、中段壁溝7Zの溝4Zの底部は、ウエハ100を左右で支持するものである。この支持を横支持部11Xとする。ここで溝4X,4ZY,4Yの幅は市販されているウエハの厚さ以上である。更に下段溝4Yの底部もウエハ100を上下方向に支持するものである。
【0011】
以上の様に構成されたウエハキャリアケース10によれは、ウエハ100が支持されるため、ウエハ100の大きな振動を低減し、ウエハのずれや隣接し合うウエハへの重なり等の問題を防止している。
【0012】
更に、図4に示す様に、上段溝壁の高さ(図4の左右方向)は、中段の溝壁7Zが最も低くなっている。これは、上段の溝壁7Xは、ウエハ100をウエハキャリア10に挿入する際の案内になり、高くしてもウエハ100と重ならないため高くすることができる。中段の溝壁7Zは、ウエハ100をウエハキャリア10に挿入する際の案内と同時に、ウエハ100を所定位置に支持するものであり、一旦ウエハ100が所定位置に配置されれば、外れることが無いので、高さを低くしても良いことになる。低くすると、中段溝壁7Zとウエハ100の重なり面積が狭くなる。下段溝壁7Yは、ウエハ100の挿入案内となり、更に、位置がずれないようにするため、高くなっている。ウエハ100は衝撃等により、所定の下段溝4Yから外れることがある。
【0013】
従来の構造の図1と図2と図3に示すウエハキャリアケースでは、ウエハ100をウエハキャリアケース10に収納し洗浄またはウェットエッチする際に、ウエハがキャリアケースのウエハ支持部上段側の溝壁7とウエハ支持部下段側溝壁7との接触またはウエハ端部がウエハ支持部の影になることによりウエハの表面、裏面、側面の洗浄を不均一にし、歩留まり低下や、ウエハ表面状態を不均一にし、膜ムラ等の異常の原因となる。また、ウエハを洗浄またはウェットエッチングする際に、ウエハキャリアケースの外壁2によりキャリアケース側面からの洗浄薬液の洗浄効果またはエッチング薬液のエッチング効果が著しく低下し、洗浄またはエッチングのウエハ面内不均一の原因となり、膜ムラ異常や歩留まり低下の原因となる。
【0014】
また、スピンドライヤー等での乾燥機による乾燥する際に、水滴もしくは薬液がキャリアケースの溝4に残りやすく、ウエハ側壁部が乾燥不均一になり、ウエハのシミ異常や歩留まり低下の原因となる。
【0015】
本願発明は、筐体10の両側壁2、2の横支持部11Xの上段側または下段側を部分的に開口部4aを設けている。ことによって、ウエハ100をウエハキャリアケース10に収納し、洗浄またはウェットエッチングする際に、ウエハキャリアケース10の側面からも洗浄薬液またはウェットエッチング薬液がウエハキャリアケース10内に入り込む。それにより、ウエハ100面内およびウエハキャリア10内のウエハ100間の洗浄均一性の向上またはウェットエッチングのウエハ面内およびウエハキャリア内のウエハ間のエッチング均一性を向上させ、ウエハの膜ムラ異常、シミ異常などのウエハ表面状態または裏面状態の異常を低減することができる。また、製品の歩留まり低下を抑制することができる。
【0016】
また、ウエハ100をウエハキャリアケース10に収納し乾燥する際においても、ウエハ面内およびウエハキャリア内のウエハ間の乾燥均一性を向上させ、シミ異常などのウエハ表面状態または裏面状態の異常を低減するとともに製品の歩留まり低下を抑制することができる。
更に、ウエハ支持部である横支持部11Xの溝たかさを他の溝高さよりも低くすることによって、ウエハ100をウエハキャリアケース10に収納し、洗浄またはウェットエッチングする際に、洗浄薬液またはウェットエッチング薬液が、ウエハ端部まで入り込む。そして、ウエハ面内およびウエハキャリア内のウエハ間の洗浄均一性の向上またはウェットエッチングのウエハ面内およびウエハキャリア内のウエハ間のエッチング均一性を向上させ、ウエハの膜ムラ異常、シミ異常などのウエハ表面状態または裏面状態の異常を低減するとともに、製品の歩留まり低下を抑制することができる。また、ウエハをウエハキャリアケースに収納し乾燥する際においても、ウエハ面内およびウエハキャリア内のウエハ間の乾燥均一性を向上させ、シミ異常などのウエハ表面状態または裏面状態の異常を低減するとともに製品の歩留まり低下を抑制することができる。
【0017】
横支持部11Xに、開口部4aに突出した溝壁7Zを項けることにより、ウエハ100の横方向支持の強度を保つことができる。また、横支持部11Xの存在により、キャリアケース10の変形やゆがみを抑制することができ、ウエハへのダメージを生じることを抑制することができる。
【0018】
【発明の効果】
本発明によれば、ウエハをウエハキャリアケースに収納し洗浄またはウェットエッチングまたは乾燥する際に、キャリアケース側面を部分的に削除することによりキャリアケース内のウエハの洗浄効果またはエッチング効果または乾燥効果の均一性を向上することによりウエハの膜ムラ異常、シミ異常などのウエハ表面状態または裏面状態の異常を低減し、歩留まり低下を抑制することができる。
【0019】
また、中段部の筐体骨部付近のスリット部を1部残し、前記対向する各溝のある筐体側面のスリット部を部分的に削除することにより、キャリアケースの強度を保つことができキャリアケースの変形やゆがみを抑制することができウエハへのダメージを生じることがない。
【0020】
更に、前記対向する各溝の中段部の溝において筐体側面からの高さを低くすることによって、ウエハをウエハキャリアケースに収納し洗浄またはウェットエッチングまたは乾燥する際に、キャリアケース内のウエハの洗浄効果またはエッチング効果または乾燥効果の均一性を向上することによりウエハの膜ムラ異常、シミ異常などのウエハ表面状態または裏面状態の異常を低減し、歩留まり低下を抑制することができる。
【図面の簡単な説明】
【図1】従来の平面図である。
【図2】図1中のC−C線断面図である。
【図3】図1中のE−E線の側断面図である。
【図4】本願発明の側断面図である。
【図5】本願発明の縦断面図である。
【符号の説明】
1  筐体
2  側壁
4  溝
4a 開口部
7  溝壁
10 ウエハキャリアケース
100 ウエハ
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wafer carrier case for storing a wafer.
[0002]
[Prior art]
FIG. 1 shows a plan view of a conventional wafer carrier case 10. FIG. 2 is a sectional view taken along line CC in FIG. 2, and FIG. 3 is a sectional view taken along line EE in FIG. A plurality of sets of grooves 2a are provided to oppose both side walls 2, 2 of the housing 1 of the conventional wafer carrier case 10. The groove 2a guides the wafer 100. The side wall 2 is formed by a vertical wall that is a vertical wall and an oblique wall that is an oblique wall that receives the wafer 100. Note that the bottom of the housing 1 is open. Further, each of the grooves 2a of the vertical wall and the oblique wall is provided with an opening slit 4 at a position facing each other. The width of each groove 2a is approximately six times the thickness of the wafer 100. The upper opening slit 4 is provided at an upper portion of a position where the vertical wall of the side wall 2 contacts the wafer 100 and at a lower portion thereof. The lower opening slit 4 is formed so as to be continuous with the vertical wall and the oblique wall, and is formed up to the position where the oblique wall and the wafer 100 are in contact with each other.
[0003]
In addition, the opening slit 4 is used to quickly remove an etchant or the like when performing etching or the like.
[0004]
[Problems to be solved by the invention]
However, in the wafer carrier case 10 shown in FIGS. 1 to 3 having the above-described conventional structure, when the wafer 100 is stored in the wafer carrier case 10 and is cleaned or wet-etched, the wafer 100 is placed on the upper part of the wall 2 of the carrier case 10. The contact between a certain vertical wall side and an oblique wall side, or the edge of the wafer 100 becomes a shadow of the groove wall 7 of the groove 2a, so that the cleaning of the front surface, the back surface, and the side surface of the wafer 100 becomes uneven, and the yield decreases. This makes the surface state of the wafer non-uniform and causes abnormalities such as film unevenness.
[0005]
Although the inside and the outside of the wafer carrier case 10 are connected to each other even with the fine opening slit 4, it is difficult to quickly introduce and discharge the etching solution or the like because of the small size, and the above-described problem exists.
[0006]
According to the present invention, when a wafer is stored in a wafer carrier case without causing the above-described problem, and when cleaning, wet etching, or drying is performed, cleaning, etching, or drying of the wafer in the wafer carrier case is made uniform, thereby making the wafer surface state uniform. Alternatively, it is an object to improve uniformity of a back surface state and suppress a decrease in product yield.
[0007]
[Means for Solving the Problems]
The present invention is directed to a wafer carrier case in which a plurality of grooves supported by a pair of opposed groove support portions of a housing are formed to face each other and at equal intervals, among the sidewalls having the opposed grooves, A large opening is provided in a part of the side wall portion where the groove and the wafer are in contact with each other, with the groove wall 7 of the groove 2a removed. That is, the openings provided in the respective grooves 2a are connected to each other.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
4 and 5 are a side sectional view and a vertical sectional view of the wafer carrier case 10 of the present invention. As shown in FIGS. 4 and 5, the outer shape of the housing is almost the same as the conventional one. As shown in FIG. 5, the groove support portion 2 and the groove wall 7 of the upper and lower opening slits 4 in FIG. 3 have a shape removed. That is, the upper and lower continuous openings 4a are provided on one side of the housing. That is, four are provided on both sides. The ceiling and bottom of the housing are also open.
[0009]
As shown in FIGS. 4 and 5, the groove support portions 2 and 2 (groove 4 and groove wall 7) on the upper and lower steps of the housing 1 are removed, and the adjacent opening slits 4 are integrated and formed on one side wall. It is formed as two upper and lower openings 4a. The remaining groove wall 7 is divided into an upper groove wall 7X, a middle groove wall 7Z, and a lower groove wall 7Y. Of course, the grooves 4X, 4Z, 4Y are provided in the respective groove walls 7X, 7Z, 7Y. Further, the vertical direction in FIG. 5 of each groove wall 7X, 7Z, 7Y protrudes so as to overlap with each opening 4a.
[0010]
Here, the bottom of the groove 4Z of the middle wall groove 7Z supports the wafer 100 on the left and right. This support is referred to as a lateral support portion 11X. Here, the width of the grooves 4X, 4ZY, 4Y is greater than the thickness of a commercially available wafer. Further, the bottom of the lower groove 4Y also supports the wafer 100 in the vertical direction.
[0011]
According to the wafer carrier case 10 configured as described above, since the wafer 100 is supported, large vibration of the wafer 100 is reduced, and problems such as a shift of the wafer and an overlap with an adjacent wafer are prevented. I have.
[0012]
Further, as shown in FIG. 4, the height of the upper groove wall (the left-right direction in FIG. 4) is the lowest in the middle groove wall 7Z. This is because the upper groove wall 7X serves as a guide when the wafer 100 is inserted into the wafer carrier 10 and can be raised because it does not overlap the wafer 100 even if it is raised. The middle groove wall 7Z supports the wafer 100 at a predetermined position at the same time as guiding when inserting the wafer 100 into the wafer carrier 10, and does not come off once the wafer 100 is placed at the predetermined position. Therefore, the height may be reduced. When the height is lowered, the overlapping area between the middle groove wall 7Z and the wafer 100 is reduced. The lower groove wall 7Y serves as an insertion guide for the wafer 100 and is raised to prevent the position from being shifted. The wafer 100 may come off from the predetermined lower groove 4Y due to impact or the like.
[0013]
In the conventional wafer carrier case shown in FIGS. 1, 2 and 3, when the wafer 100 is housed in the wafer carrier case 10 and is cleaned or wet-etched, the wafer is caught by the groove wall on the upper side of the wafer supporting portion of the carrier case. The contact between the wafer 7 and the lower groove wall 7 of the wafer support portion or the edge of the wafer becomes a shadow of the wafer support portion, so that the cleaning of the front surface, the back surface, and the side surface of the wafer becomes non-uniform, thereby lowering the yield and making the surface state of the wafer non-uniform. And causes abnormalities such as film unevenness. Further, when the wafer is cleaned or wet-etched, the cleaning effect of the cleaning solution from the side of the carrier case or the etching effect of the etching solution is significantly reduced by the outer wall 2 of the wafer carrier case. This causes abnormal film unevenness and lowers the yield.
[0014]
Further, when drying is performed by a dryer using a spin drier or the like, water droplets or chemicals are likely to remain in the grooves 4 of the carrier case, and the side walls of the wafer become unevenly dried, which causes abnormal spots on the wafer and lowers the yield.
[0015]
In the present invention, an opening 4a is provided partially on the upper side or the lower side of the lateral support portion 11X of both side walls 2, 2 of the housing 10. Thus, when the wafer 100 is stored in the wafer carrier case 10 and cleaned or wet-etched, the cleaning chemical or the wet etching chemical enters the wafer carrier case 10 from the side surface of the wafer carrier case 10. As a result, the uniformity of cleaning between the wafers 100 and the wafers 100 in the wafer carrier 10 or the uniformity of the wet etching between the wafers in the wafer surface and the wafers in the wafer carrier are improved, and the film unevenness of the wafers is improved. It is possible to reduce abnormalities in the surface state or the rear surface state of the wafer such as spot abnormalities. Further, it is possible to suppress a decrease in product yield.
[0016]
Also, when the wafer 100 is stored in the wafer carrier case 10 and dried, the drying uniformity between the wafer surface and the wafers in the wafer carrier is improved, and the abnormality of the wafer surface state or the back surface state such as spot abnormality is reduced. In addition, it is possible to suppress a decrease in product yield.
Further, by making the groove height of the lateral support portion 11X, which is the wafer support portion, lower than the other groove heights, when the wafer 100 is housed in the wafer carrier case 10 and cleaned or wet-etched, the cleaning solution or the wet chemical solution is used. The etching chemical enters the edge of the wafer. Then, the cleaning uniformity between the wafers in the wafer surface and the wafer carrier or the etching uniformity between the wafers in the wafer surface and the wafers in the wafer carrier in the wet etching is improved, and the film unevenness of the wafer, abnormal spots, etc. It is possible to reduce abnormalities in the state of the front surface or the back surface of the wafer and to suppress a decrease in the yield of products. Also, when storing and drying the wafers in the wafer carrier case, the drying uniformity between the wafers within the wafer surface and between the wafers in the wafer carrier is improved, and the abnormality of the wafer surface state or the back surface state such as a spot abnormality is reduced. A decrease in product yield can be suppressed.
[0017]
By forming a groove wall 7Z projecting from the opening 4a in the lateral support portion 11X, the strength of lateral support of the wafer 100 can be maintained. In addition, the presence of the lateral support portions 11X can suppress deformation and distortion of the carrier case 10, and can suppress damage to the wafer.
[0018]
【The invention's effect】
According to the present invention, when a wafer is stored in a wafer carrier case and is cleaned or wet-etched or dried, a side surface of the carrier case is partially removed to reduce a cleaning effect or an etching effect or a drying effect of the wafer in the carrier case. By improving the uniformity, it is possible to reduce abnormalities in the wafer surface state or the rear surface state, such as abnormalities in film unevenness and spots in the wafer, and to suppress a decrease in yield.
[0019]
In addition, by leaving a part of the slit near the housing bone at the middle part and partially removing the slit on the side of the housing where the opposed grooves are provided, the strength of the carrier case can be maintained. The deformation and distortion of the case can be suppressed, and no damage to the wafer occurs.
[0020]
Further, by lowering the height from the side surface of the housing in the middle groove of each of the opposed grooves, when the wafer is stored in the wafer carrier case and washed or wet-etched or dried, the wafer in the carrier case is removed. By improving the uniformity of the cleaning effect, the etching effect, or the drying effect, abnormalities in the surface state or back surface state of the wafer, such as abnormal film unevenness and spots, can be reduced, and a decrease in yield can be suppressed.
[Brief description of the drawings]
FIG. 1 is a conventional plan view.
FIG. 2 is a sectional view taken along line CC in FIG.
FIG. 3 is a side sectional view taken along line EE in FIG. 1;
FIG. 4 is a side sectional view of the present invention.
FIG. 5 is a longitudinal sectional view of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Case 2 Side wall 4 Groove 4a Opening 7 Groove wall 10 Wafer carrier case 100 Wafer

Claims (3)

筐体における側壁に対向する一組の溝により支持される溝を対向する状態にかつ等間隔に複数形成したウエハキャリアケースにおいて、前記対向する各溝のある筐体側面に隣り合った複数の溝に渡って繋がる開口部を設けたことを特徴とするウエハキャリアケース。In a wafer carrier case in which a plurality of grooves supported by a pair of grooves opposing a side wall of a housing are formed at equal intervals and in opposition to each other, a plurality of grooves adjacent to a side surface of the housing having the opposing grooves are provided. A wafer carrier case, characterized in that an opening is provided to connect to the wafer carrier case. 前記各側壁に中央部を残し上下2段の開口部を設けた請求項1記載のウエハキャリアケース。2. The wafer carrier case according to claim 1, wherein two upper and lower openings are provided in each of said side walls while leaving a central portion. 前記対向する各溝の中央部の溝の側壁の高さにおいて側壁からの高さが低い請求項2記載のウエハキャリアケース。3. The wafer carrier case according to claim 2, wherein the height of the side wall of the central groove of each of the opposed grooves is lower than the side wall.
JP2002191839A 2002-07-01 2002-07-01 Wafer carrier case Expired - Fee Related JP4256122B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008112804A (en) * 2006-10-30 2008-05-15 Shin Etsu Polymer Co Ltd Wafer cassette
EP2088621A1 (en) * 2008-02-08 2009-08-12 Insotech OHG Substrate carrier
JP2016181629A (en) * 2015-03-24 2016-10-13 株式会社カネカ Device for manufacturing silicon substrate for solar battery and manufacturing method therefor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008112804A (en) * 2006-10-30 2008-05-15 Shin Etsu Polymer Co Ltd Wafer cassette
EP2088621A1 (en) * 2008-02-08 2009-08-12 Insotech OHG Substrate carrier
JP2016181629A (en) * 2015-03-24 2016-10-13 株式会社カネカ Device for manufacturing silicon substrate for solar battery and manufacturing method therefor

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