EP0881035B1 - Verfahren zur materialabtragenden Bearbeitung der Kante einer Halbleiterscheibe - Google Patents
Verfahren zur materialabtragenden Bearbeitung der Kante einer Halbleiterscheibe Download PDFInfo
- Publication number
- EP0881035B1 EP0881035B1 EP97115333A EP97115333A EP0881035B1 EP 0881035 B1 EP0881035 B1 EP 0881035B1 EP 97115333 A EP97115333 A EP 97115333A EP 97115333 A EP97115333 A EP 97115333A EP 0881035 B1 EP0881035 B1 EP 0881035B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- semiconductor wafer
- machining
- edge
- tools
- tool
- 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.)
- Expired - Lifetime
Links
- 238000003754 machining Methods 0.000 title claims description 60
- 239000000463 material Substances 0.000 title claims description 19
- 238000000034 method Methods 0.000 title claims description 18
- 239000004065 semiconductor Substances 0.000 claims description 70
- 238000005498 polishing Methods 0.000 claims description 7
- 239000012459 cleaning agent Substances 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 3
- 238000002604 ultrasonography Methods 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims 1
- 235000012431 wafers Nutrition 0.000 description 61
- 239000006061 abrasive grain Substances 0.000 description 4
- 238000009499 grossing Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000000699 topical effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3205—Deposition of non-insulating-, e.g. conductive- or resistive-, layers on insulating layers; After-treatment of these layers
- H01L21/321—After treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0076—Other grinding machines or devices grinding machines comprising two or more grinding tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/04—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes subjecting the grinding or polishing tools, the abrading or polishing medium or work to vibration, e.g. grinding with ultrasonic frequency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B37/00—Lapping machines or devices; Accessories
- B24B37/02—Lapping machines or devices; Accessories designed for working surfaces of revolution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
- B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
- B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
- B24B9/065—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of thin, brittle parts, e.g. semiconductors, wafers
Definitions
- the invention relates to a method for material-removing processing of the edge of a semiconductor wafer for the purpose of creating a smooth edge surface with a specific profile.
- the untreated edge of a semiconductor wafer separated from a single crystal has a comparatively rough and non-uniform surface. It breaks out frequently under mechanical stress and is a source of disruptive particles. It is therefore common to smooth the edge and give it a certain profile. This is done by machining the edge with a suitable processing tool.
- DE-195 35 616 A1 describes a grinding device with which such processing can be carried out.
- the semiconductor wafer is fixed on a rotating table during processing and is fed with the edge against the likewise rotating work surface of a processing tool.
- An advantage of this device is that it is suitable for being able to process the edge of the semiconductor wafer step by step with various processing tools.
- the aim of the present invention is to remove material from the edge of a material Semiconductor wafer to make it even more effective.
- this goal is achieved by a process for the removal of material Edge of a semiconductor wafer, the semiconductor wafer on a rotatable Table rests, is rotated about a central axis and with a plurality of rotating Editing tools is edited, and each of the editing tools one remove a certain amount of material from the edge of the semiconductor wafer, the machining tools in the course of a 360 ° rotation the semiconductor wafer are successively fed against the edge of the semiconductor wafer and finally process the edge of the semiconductor wafer simultaneously, using a processing tool, that is being delivered, a smaller amount from the edge of the wafer to remove, as a previously delivered machining tool, and being the machining the edge of the semiconductor wafer with a processing tool at the earliest will, after the semiconductor wafer, from the infeed of this machining tool counted, turned 360 °, characterized in that adjacent editing tools with be rotated in opposite directions and the edge of the semiconductor wafer during processing at least one point with a liquid detergent, which if necessary is exposed to ultrasound or mega
- the process saves an enormous amount of time because the edge is processed with different types Machining tools sometimes done simultaneously and after less than two revolutions of the semiconductor wafer can already be completed. It can two or more, preferably 2 to 5 different processing tools be used.
- the processing tools used in the process are preferably disks formed, which are attached to a spindle and have peripheral surfaces that as Work surfaces serve to process the edge of the semiconductor wafer.
- the peripheral surfaces to the spindle axis be curved and form recesses corresponding to the desired edge profile.
- several slices can lie on top of each other in a stack, with one stack the same or different types of processing tools can be combined.
- Preferred processing tools are grinding tools, polishing tools and tools for ductile grinding.
- the material-removing abrasive grain of grinding tools is usually firmly anchored in the working surface of the grinding tool.
- Other polishing tools cause material removal on chemical-mechanical Way, optionally with a polishing agent to the work surface of the Polishing tool must be fed.
- the material to be processed can be ductile (without Crack formation). With this ductile grinding particularly smooth surfaces can be created (M.Kerstan et al. in: Proc. American Soc. for Precision Engineering, Cincinatti 1994).
- the amount of material removed by a machining tool when machining the edge of a semiconductor wafer is usually caused by specifying the thickness of the removed material layer expressed.
- Two editing tools are different in the sense of the invention (similar) considered if they are different under the same conditions cause (same) material removal.
- At Grinding tools determine the size of the abrasive grain used decisive is the material removal that the grinding tool should cause.
- the material removal with a grinding tool usually larger be as the material removal that with a polishing tool or with a tool for ductile grinding becomes.
- a semiconductor wafer is used to carry out the method fixed on a rotating table, a so-called chuck.
- the edge of the semiconductor wafer protrudes over the edge of the Table out so that it is easily accessible for machining tools is. It is preferred that the table be the wafer holds and movable in a horizontal plane is stored so that the semiconductor wafer if necessary can be transported to the processing tools.
- An indispensable feature of the invention is that two or several different processing tools are used and these during one turn of the semiconductor wafer are successively fed to the edge.
- the order of delivery depends on the amount of material removed using a processing tool is intended to achieve. First the processing tool is delivered, that should cause the highest material removal. The infeed is then done with the processing tool continued, which cause the next lower material removal should, and so on.
- the method could be used to deal with two Grinding tools a rough and a fine grinding of the edge of a semiconductor wafer to be carried out at the same time at least temporarily.
- the edge could also be processed using which are used in the appropriate order in one operation ground and polished, or ground and ductile ground.
- the edge has a liquid cleaning agent at at least one point, which may be subjected to ultrasound or megasound.
- the supply of cleaning agent is preferably at a point on the edge that is already was processed by a grinding tool and shortly before processing by a polishing tool or a tool for ductile grinding.
- All processing tools used are fed in during a 360 ° rotation of the semiconductor wafer.
- All processing tools have been delivered, they process the edge of the semiconductor wafer at the same time.
- the processing of the edge of the semiconductor wafer with a specific processing tool is ended at the earliest after the semiconductor wafer has rotated through 360 ° from the infeed of this processing tool.
- the smoothing angle ⁇ need only be a few degrees. This ensures that a step that may have formed on the surface of the edge when the machining tool is engaged is removed.
- the end of the processing of the edge of the semiconductor wafer with a processing tool is brought about by withdrawing this processing tool from the edge.
- the processing tools can be withdrawn at the same time or in the order in which the processing tools were delivered against the edge.
- the sequence of the method is shown below using a figure using the example of the use of three different processing tools explained in more detail.
- the figure shows schematically the top view of a semiconductor wafer and the three various editing tools with which the edge the semiconductor wafer is processed. They are just such Features shown for understanding the invention contribute.
- the semiconductor wafer is transported along a y-axis to a processing position.
- a table on which the semiconductor wafer 4 is fixed rotates it around a central axis M at a specific feed rate.
- the processing of the edge 5 of the semiconductor wafer 4 begins with the infeed of a first processing tool 1 along a y 1 axis.
- the machining tool 1 rotating about an axis N engages with its working surface 6 in a contact zone I in the edge 5 of the semiconductor wafer 4.
- a second machining tool 2 which rotates about an axis O, is delivered as the next machining tool along a y 2 axis. With its working surface 7, it takes up the processing of the edge 5 in a contact zone II.
- the semiconductor wafer rotates by the feed angle ⁇ 1.
- This marks the position of the contact zone II and has the value ⁇ 1 90 ° in the example shown.
- a third machining tool 3 which rotates about an axis P, is finally delivered along a y 3 axis.
- a device 8 for supplying a cleaning agent R, for example a megasonic nozzle, is located between the processing tool 2 and the processing tool 3.
- the machining tool 3 takes up the machining of the edge 5 in a contact zone III with its working surface 9.
- the semiconductor wafer rotates by the feed angle ⁇ 1 + ⁇ 2 .
- This marks the position of contact zone III and has the value in the example shown ⁇ 1 + ⁇ 2nd 180 ° .
- each additional processing tool n (not shown in the figure) would be fed along a y n axis and the processing of the edge would start in a contact zone X n .
- the location of the contact zone X n would again result from the feed angle by which the semiconductor wafer rotates between the infeed of the first and the infeed of the nth machining tool.
- the processing tool 3 is withdrawn along the y 3 axis from the edge 5 of the semiconductor wafer after the semiconductor wafer has made a rotation of 360 ° and the smoothing angle ⁇ since the delivery of this processing tool. If the processing tools 1 and 2 have not yet been withdrawn from the edge by this time, they are withdrawn along the y 1 and y 2 axes simultaneously with the withdrawal of the treatment tool 3. Then the table on which the semiconductor wafer is placed lies, moved along the y-axis into an unloading position, and the semiconductor wafer 4 is replaced by another with a not yet machined edge for a new machining cycle.
- the diameter of the machining tools also plays an important role in minimizing the duration of machining the edge of a semiconductor wafer.
- the semiconductor wafer rotates through a certain total feed angle during the processing of the edge. The smaller this total feed angle, the shorter the processing time.
- the preferred total feed angle is made up of a feed angle by which the semiconductor wafer rotates (counting from the infeed of the processing tool delivered first) until all processing tools have been delivered and the previously mentioned feed angle of 360 ° + ⁇ , around which the semiconductor wafer then turns until the end of processing.
- the value of the feed angle mentioned first depends on the distances between the machining tools and thus also on the diameter of the machining tools.
- the distance between adjacent processing tools can be specified by an offset angle.
- the offset angle between the machining tool 1 and the machining tool 2 corresponds to the feed angle ⁇ 1 and is 90 °.
- the offset angle between the machining tool 2 and the machining tool 3 corresponds to ⁇ 2 and also has the value of 90 °.
- the semiconductor wafer has rotated by a feed angle of 180 °.
- the processing of the semiconductor wafer would accordingly take a total of the time required for the rotation of the semiconductor wafer by an overall feed angle of 180 ° + 360 ° + ⁇ corresponds. Small offset angles are possible when using machining tools with smaller diameters.
- the diameters of the machining tools 1 to 3 and the offset angles between them could be selected such that these tools can be advanced by a feed angle of 90 ° while the semiconductor wafer is rotating. Then the processing of the semiconductor wafer would only take the time that a rotation of the semiconductor wafer by a total feed angle of 90 ° + 360 ° + ⁇ corresponds. It is therefore preferred to use machining tools with small diameters, if possible, and to keep the offset angles between the machining tools as small as possible. However, it should also be borne in mind that machining tools with relatively small diameters also have smaller work surfaces and therefore wear out earlier.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Description
Die unbehandelte Kante einer von einem Einkristall abgetrennten Halbleiterscheibe hat eine vergleichsweise rauhe und uneinheitliche Oberfläche. Sie bricht bei mechanischer Belastung häufig aus und ist eine Quelle störender Partikel. Es ist daher üblich, die Kante zu glätten und ihr ein bestimmtes Profil zu geben. Dies geschieht durch eine materialabtragende Bearbeitung der Kante mit einem geeigneten Bearbeitungswerkzeug. In der DE-195 35 616 A1 ist eine Schleifvorrichtung beschrieben, mit der eine solche Bearbeitung vorgenommen werden kann. Die Halbleiterscheibe ist während der Bearbeitung auf einem sich drehenden Tisch fixiert und wird mit der Kante gegen die sich ebenfalls drehende Arbeitsfläche eines Bearbeitungswerkzeugs zugestellt. Ein Vorteil dieser Vorrichtung besteht darin, daß sie geeignet ist, die Kante der Halbleiterscheibe schrittweise mit verschiedenartigen Bearbeitungswerkzeugen bearbeiten zu können.
Claims (4)
- Verfahren zur materialabtragenden Bearbeitung der Kante einer Halbleiterscheibe, wobei die Halbleiterscheibe auf einem drehbeweglichen Tisch aufliegt, um eine Mittelachse gedreht wird und mit einer Mehrzahl von sich drehenden Bearbeitungswerkzeugen bearbeitet wird, und jedes der Bearbeitungswerkzeuge eine bestimmte Menge an Material von der Kante der Halbleiterscheibe abtragen soll, wobei
die Bearbeitungswerkzeuge im Verlauf einer 360°-Drehung der Halbleiterscheibe nacheinander gegen die Kante der Halbleiterscheibe zugestellt werden und die Kante der Halbleiterscheibe schließlich gleichzeitig bearbeiten, wobei ein Bearbeitungswerkzeug, das gerade zugestellt wird, eine geringere Menge von der Kante der Halbleiterscheibe abtragen soll, als ein zuvor zugestelltes Bearbeitungswerkzeug, und wobei die Bearbeitung der Kante der Halbleiterscheibe mit einem Bearbeitungswerkzeug frühestens beendet wird, nachdem sich die Halbleiterscheibe von der Zustellung dieses Bearbeitungswerkzeugs an gerechnet, um 360° gedreht hat, dadurch gekennzeichnet, daß benachbarte Bearbeitungswerkzeuge mit gegensinnigen Drehsinn gedreht werden, und die Kante der Halbleiterscheibe während der Bearbeitung an mindestens einer Stelle mit einem flüssigen Reinigungsmittel, das gegebenenfalls mit Ultra- oder Megaschall beaufschlagt ist, in Kontakt gebracht wird. - Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß die Bearbeitungswerkzeuge aus einer Gruppe ausgewählt werden, die Schleifwerkzeuge, Polierwerkzeuge und Werkzeuge zum duktilen Schleifen umfaßt.
- Verfahren gemäß Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß die Bearbeitung beendet wird, indem die Bearbeitungswerkzeuge in einer Reihenfolge von der Kante der Halbleiterscheibe zurückgenommen werden, die der Reihenfolge entspricht, in der sie zugestellt wurden.
- Verfahren gemäß Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß die Bearbeitung beendet wird, indem die Bearbeitungswerkzeuge gleichzeitig von der Kante der Halbleiterscheibe zurückgenommen werden.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19636055A DE19636055A1 (de) | 1996-09-05 | 1996-09-05 | Verfahren zur materialabtragenden Bearbeitung der Kante einer Halbleiterscheibe |
DE19636055 | 1996-09-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0881035A1 EP0881035A1 (de) | 1998-12-02 |
EP0881035B1 true EP0881035B1 (de) | 1999-10-27 |
Family
ID=7804717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97115333A Expired - Lifetime EP0881035B1 (de) | 1996-09-05 | 1997-09-04 | Verfahren zur materialabtragenden Bearbeitung der Kante einer Halbleiterscheibe |
Country Status (6)
Country | Link |
---|---|
US (1) | US6045436A (de) |
EP (1) | EP0881035B1 (de) |
JP (1) | JP2900253B2 (de) |
KR (1) | KR100273960B1 (de) |
DE (2) | DE19636055A1 (de) |
TW (1) | TW352354B (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11320363A (ja) * | 1998-05-18 | 1999-11-24 | Tokyo Seimitsu Co Ltd | ウェーハ面取り装置 |
DE19841492A1 (de) * | 1998-09-10 | 2000-03-23 | Wacker Siltronic Halbleitermat | Verfahren und Vorrichtung zum Abtrennen einer Vielzahl von Scheiben von einem sprödharten Werkstück |
DE19928949A1 (de) * | 1999-06-24 | 2001-01-04 | Wacker Siltronic Halbleitermat | Verfahren zur Herstellung einer Halbleiterscheibe |
JP3510584B2 (ja) * | 2000-11-07 | 2004-03-29 | スピードファム株式会社 | 円板形ワークの外周研磨装置 |
US20020058466A1 (en) * | 2000-11-13 | 2002-05-16 | Curran David M. | Method and system for reducing thickness of spin-on glass on semiconductor wafers |
US6860795B2 (en) * | 2001-09-17 | 2005-03-01 | Hitachi Global Storage Technologies Netherlands B.V. | Edge finishing process for glass or ceramic disks used in disk drive data storage devices |
DE10147646C1 (de) * | 2001-09-27 | 2002-12-19 | Wacker Siltronic Halbleitermat | Verfahren zur materialabtragenden Bearbeitung der Kante einer Halbleiterscheibe |
US20070298240A1 (en) * | 2006-06-22 | 2007-12-27 | Gobena Feben T | Compressible abrasive article |
US9676114B2 (en) * | 2012-02-29 | 2017-06-13 | Taiwan Semiconductor Manufacturing Company, Ltd. | Wafer edge trim blade with slots |
KR101414204B1 (ko) * | 2013-01-30 | 2014-07-01 | 주식회사 엘지실트론 | 웨이퍼 에지 그라인딩 장치 및 웨이퍼 에지 그라인딩 방법 |
JP2014226767A (ja) * | 2013-05-27 | 2014-12-08 | 株式会社東京精密 | ウェーハ面取り装置及びウェーハ面取り方法 |
JP7222636B2 (ja) * | 2018-09-12 | 2023-02-15 | 株式会社ディスコ | エッジトリミング装置 |
CN110605629B (zh) * | 2019-09-19 | 2022-11-18 | 西安奕斯伟材料科技有限公司 | 一种研磨装置 |
CN114643519B (zh) * | 2022-03-26 | 2022-12-09 | 浙江金连接科技股份有限公司 | 一种半导体芯片测试探针用钯合金套桶及其加工设备 |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60104644A (ja) * | 1983-11-08 | 1985-06-10 | Mitsubishi Metal Corp | ウエハ−の外周研削・面取装置 |
JPH0637025B2 (ja) * | 1987-09-14 | 1994-05-18 | スピードファム株式会社 | ウエハの鏡面加工装置 |
KR0185234B1 (ko) * | 1991-11-28 | 1999-04-15 | 가부시키 가이샤 토쿄 세이미쯔 | 반도체 웨이퍼의 모떼기 방법 |
JP2628424B2 (ja) * | 1992-01-24 | 1997-07-09 | 信越半導体株式会社 | ウエーハ面取部の研磨方法及び装置 |
JPH07205001A (ja) * | 1993-11-16 | 1995-08-08 | Tokyo Seimitsu Co Ltd | ウェーハ面取り機 |
US5595522A (en) * | 1994-01-04 | 1997-01-21 | Texas Instruments Incorporated | Semiconductor wafer edge polishing system and method |
JP3010572B2 (ja) * | 1994-09-29 | 2000-02-21 | 株式会社東京精密 | ウェーハエッジの加工装置 |
US5816897A (en) * | 1996-09-16 | 1998-10-06 | Corning Incorporated | Method and apparatus for edge finishing glass |
US5725414A (en) * | 1996-12-30 | 1998-03-10 | Intel Corporation | Apparatus for cleaning the side-edge and top-edge of a semiconductor wafer |
-
1996
- 1996-09-05 DE DE19636055A patent/DE19636055A1/de not_active Withdrawn
-
1997
- 1997-07-25 JP JP9200342A patent/JP2900253B2/ja not_active Expired - Fee Related
- 1997-08-05 US US08/906,573 patent/US6045436A/en not_active Expired - Lifetime
- 1997-08-26 KR KR1019970041267A patent/KR100273960B1/ko not_active IP Right Cessation
- 1997-09-01 TW TW086112483A patent/TW352354B/zh not_active IP Right Cessation
- 1997-09-04 DE DE59700621T patent/DE59700621D1/de not_active Expired - Lifetime
- 1997-09-04 EP EP97115333A patent/EP0881035B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JP2900253B2 (ja) | 1999-06-02 |
KR100273960B1 (ko) | 2001-01-15 |
DE59700621D1 (de) | 1999-12-02 |
TW352354B (en) | 1999-02-11 |
JPH1080849A (ja) | 1998-03-31 |
EP0881035A1 (de) | 1998-12-02 |
KR19980024185A (ko) | 1998-07-06 |
US6045436A (en) | 2000-04-04 |
DE19636055A1 (de) | 1998-03-12 |
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