EP0607441B1 - Schleifvorrichtung und verfahren zur verwendung desselben - Google Patents

Schleifvorrichtung und verfahren zur verwendung desselben Download PDF

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Publication number
EP0607441B1
EP0607441B1 EP93904297A EP93904297A EP0607441B1 EP 0607441 B1 EP0607441 B1 EP 0607441B1 EP 93904297 A EP93904297 A EP 93904297A EP 93904297 A EP93904297 A EP 93904297A EP 0607441 B1 EP0607441 B1 EP 0607441B1
Authority
EP
European Patent Office
Prior art keywords
polishing
sample
polishing cloth
elastic body
cloth
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
Application number
EP93904297A
Other languages
English (en)
French (fr)
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EP0607441A1 (de
EP0607441A4 (en
Inventor
Toshiyasu Sumitomo Metal Industries Ltd. Beppu
Junji Sumitomo Metal Industries Ltd. Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP05023035A external-priority patent/JP3024417B2/ja
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Publication of EP0607441A1 publication Critical patent/EP0607441A1/de
Publication of EP0607441A4 publication Critical patent/EP0607441A4/en
Application granted granted Critical
Publication of EP0607441B1 publication Critical patent/EP0607441B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B24B37/11—Lapping tools
    • B24B37/12—Lapping plates for working plane surfaces
    • 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
    • B24B37/27—Work carriers
    • B24B37/30—Work carriers for single side lapping of plane surfaces
    • 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
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/06—Work supports, e.g. adjustable steadies
    • B24B41/068—Table-like supports for panels, sheets or the like

Definitions

  • Fig. 1 is a perspective view of a prior art polishing apparatus for polishing a large flat substrate.
  • 1 is a disk-like polishing table which can horizontally be rotated by a rotating spindle 6.
  • a polishing cloth 2 which is made of nonwoven fabric such as polyurethane is stuck by an adhesive 21.
  • a disk-like sample holder 3 which is smaller than the polishing table 1 is located at a position above the polishing cloth 2 and separated therefrom by an adequate distance.
  • the sample holder 3 can horizontally be rotated and moved by a sample holder rotary shaft 5 which is liftable and connected to a driving unit (not shown).
  • the elastic deformation of the polishing cloth causes the polishing cloth to deform along the irregularity of the surface of the insulating film, and thus the polishing is done on not only convex portions but also concave portions.
  • FIG. 3 is a diagrammatic section view showing the contacting state between a very hard polishing cloth and a wafer. Wirings (not shown) are formed on a wafer substrate 81, and covered by an insulating film 83.
  • a very hard polishing cloth 82 has a very high elastic modulus, the polishing cloth contacts to portions which are convex ones in a macroscopic view point, irrespective of the flatness of the wafer surface, and polishes only the contacting portions. Accordingly, the technique has a problem in that the insulating film 83 cannot be polished to a uniform thickness in a macroscopic view point.
  • a flat plate-like sample which is held between a rotating sample holder and a polishing cloth which covers a rotating polishing table is polished, a first elastic body being interposed between said polishing table and said polishing cloth, and said polishing cloth consisting of a second elastic body having convex portions, or concave portions or groove portions at a contacting face thereof with said flat plate-like sample.
  • the surface of the polishing cloth can deform in accordance with the flatness of a sample in a macroscopic view point so that convex portions in a microscopic view point of the sample are selectively polished.
  • an annular disk-like elastic body may be interposed so that a face of the polishing cloth contacts a small area of a face of a sample to be polished. This allows the contacting state between the face of the polishing cloth and the face of the sample to be polished to become uniform. Therefore, a polishing is conducted without causing the face of the polishing cloth to apply an excessive load to the periphery portion of the sample.
  • Fig. 1 is a perspective view showing the configuration of a prior art polishing apparatus.
  • Fig. 2 is a diagrammatic section view showing one portion of the prior art polishing apparatus.
  • Fig. 3 is a diagrammatic section view showing one portion of the prior art polishing apparatus.
  • Fig. 4 is a front view showing, partly in section, a first embodiment of a polishing apparatus
  • Fig. 5 is a diagrammatic section view showing one portion of a sample to be polished.
  • Fig. 6 is a front view showing, partly in section, a second embodiment of a polishing apparatus.
  • Fig. 7 is a front view showing, partly in section, a third embodiment of a polishing apparatus.
  • Fig. 8 is a diagrammatic section view showing one portion of a fourth embodiment of a polishing apparatus.
  • Fig. 9 is a diagrammatic section view showing one portion of a fifth embodiment of a polishing apparatus which is an embodiment of the invention.
  • Fig. 10 is a graph showing level differences which were measured each time when a surface of a sample was polished by the polishing apparatus of the fourth embodiment.
  • 1 is a disk-like polishing table
  • 3 is a disk-like sample holder.
  • the center of the upper face of the polishing table 1 is connected to a lower end portion of a rotating spindle 6 so as to be horizontally rotatable.
  • the sample holder 3 mounted on a spindle 55 which can horizontally be rotated and moved.
  • the spindle 55 is located at a position which is eccentric with respect to the polishing table 1.
  • the rotation center of the spindle 55 can horizontally move in the direction from the periphery portion of a polishing cloth 2 and opposite to the center of the polishing table 1, by a distance which is approximately equal to the radius of a sample B.
  • a large size silicon wafer having a diameter of 8 inches is fixed onto the sample holder 3 by a vacuum chuck 4.
  • polishing cloth 2 a mixture body of polyurethane resin and fibers is used. The tension is adjusted to a value at which the elastic body 201 deforms by about 0.1 mm.
  • the sample holder 3 is moved to a position where the periphery portion of the polishing cloth 2 is perpendicularly above the rotation center of the sample holder.
  • the polishing table 1 is lowered to a position where the polishing cloth 2 contacts the sample B.
  • the contacting position is determined by detecting the output load of the motor for the rotating spindle 6 by which the polishing table 1 is rotated.
  • the polishing table 1 is further pressingly lowered from the contacting position to a position where the elastic body 201 deforms by about 0.3 mm.
  • the sample holder 3 on which the sample B is mounted is horizontally oscillated in the direction opposite to the center of the polishing table 1, by a distance which is approximately equal to the radius of the sample B, and the sample B is polished. In this polishing, the sample B can be uniformly polished.
  • the periphery portion of the sample B can be more uniformly polished.
  • FIG. 5 is a diagrammatic section view showing the configuration of the sample B.
  • a large size silicon wafer substrate 31 of a diameter of 8 inches has a flatness of 2 to 3 ⁇ m, and wirings 34, 34 ... are formed on the substrate.
  • An insulating film 33 is deposited so as to cover the wirings.
  • the film thickness distribution of the insulating film 33 is about 10 %, and the flatness of the sample B is 3 to 4 ⁇ m.
  • the sample B is fixed onto the sample holder 3 by the vacuum chuck 4.
  • the polishing reagent 8 in which ultrafine particles of SiO 2 (average particle diameter: 0.1 ⁇ m to 0.2 ⁇ m) are suspended in a weak alkaline (from pH 10 to pH 12) liquid is supplied at 3 liters/min. to the face to be polished, the polishing table 1 is rotated at 2000 rpm, and the sample holder 3 onto which the sample B is mounted is rotated at 200 rpm.
  • the polishing cloth 2 Since the polishing cloth 2 is hard and has a thickness equal to or less than 0.8 mm, the polishing cloth 2 and the elastic body 201 deform along irregularities in a macroscopic view point of the contacting face of the sample B, and the polishing cloth 2 does not deform along irregularities in a microscopic view point of the contacting face of the sample B. Therefore, a microscopic flattening can be efficiently conducted on the whole surface of the sample B.
  • the thickness of the polishing cloth 2 is preferably set so that the change in the pressure of the polishing table 1 is not greater than 20 % with respect to the change of 3 to 4 ⁇ m in the deformation of the elastic body 201.
  • the polishing cloth 2 may be of a material other than those described in the above embodiment, namely, a sheet of Teflon, nonwoven fabric, expanded polyurethane resin, resin including particles of an oxide such as selenium oxide or diamond particles, or the like.
  • Fig. 6 is a front view showing, partly in section, a second embodiment of a polishing apparatus.
  • a polishing table 1 is connected at the center of the upper face to a lower end portion of a rotating spindle 6 so as to be horizontally rotatable.
  • the spindle 55 is located at a position which is concentric with respect to the polishing table 1, and can horizontally move in the direction from the center of a polishing cloth 2 toward the periphery direction, by a distance which is approximately equal to the radius of a sample.
  • a recess having a concentric circular shape is formed on the lower face of the polishing table 1.
  • a disk-like elastic body 202 one face of which is spherical is fitted.
  • the thickness of the periphery portion of the elastic body is greater than the depth of the recess so that the elastic body 202 protrudes from the polishing table 1.
  • a polishing cloth 2 is fixed so as to cover the elastic body 202.
  • a sample B is firstly mounted on the sample holder 3. Then, the sample holder 3 is horizontally moved in the direction from the center of the polishing table 1 toward the periphery portion of the polishing table 1, by a distance which is approximately equal to the radius of the sample B, and the sample B is polished. In this polishing, the face of the sample B to be polished can be uniformly polished.
  • the rotating spindle 6 for rotating the polishing table 1 is tilted by several deg. with respect to the perpendicular direction, it is possible to prevent the polishing cloth 2 from gathering to the point at which it contacts the sample B, thereby improving the abrasive resistance of the polishing cloth 2.
  • Fig. 7 is a front view showing, partly in section, a third embodiment of a polishing apparatus.
  • 1 is a disk-like polishing table which is connected at the center of the upper face to a lower end portion of a rotating spindle 6 so as to be horizontally rotatable.
  • a disk-like sample holder 3 for mounting a sample and mounted on a spindle 55 which can horizontally be rotated and moved.
  • the spindle 55 is located at a position which is concentric with the polishing table 1.
  • the rotation center of the spindle 55 can horizontally move in the direction from the center of a polishing cloth 2 toward the periphery portion, by at least a distance equal to the radius of the sample.
  • a recess having a concentric circular shape is formed on the lower face of the polishing table 1.
  • the periphery portion of the polishing cloth 2 is fixed to the lower portion of the polishing table 1 by fixing rings 102, 103, 103, ... and bolts 104, 104 ...
  • An encapsulating bag 9 is loosely inserted between the polishing table 1 and the polishing cloth 2.
  • a supply duct 10 for supplying a liquid 203 to the encapsulating bag 9 passes through the center portion of the rotating spindle 6, and is attached to the center portion of the upper face of the encapsulating bag 9.
  • the liquid 203 is poured through the supply duct 10 into the encapsulating bag 9, so that the fluid encapsulating portion having a spherical shape is formed between the polishing table 1 and the polishing cloth 2.
  • a polishing reagent supply nozzle 7 for ejecting a polishing reagent 8 is disposed in the vicinity of the center of the polishing cloth 2.
  • the sample holder 3 is moved to a position where the rotary shaft of the sample holder 3 and that of the polishing table 1 are on the same perpendicular line, and their rotations are started to conduct a polishing.
  • positions of the face of the sample B to be polished are pressed by a substantially constant pressure, and hence can be uniformly polished.
  • a polishing may be conducted while fixing the sample holder 3 at a position where the polishing table 1 and the rotary shaft are coincident as described above.
  • a polishing may be conducted while moving the sample holder 3 in a radial direction of the sample.
  • a liquid is encapsulated into the encapsulating bag 9.
  • a gas may be encapsulated into the encapsulating bag.
  • Fig. 8 is a diagrammatic section view showing one portion of a fourth embodiment of a polishing apparatus. More specifically, Fig. 8 is a section view showing on an enlarged scale the polishing cloth 2, the annular disk-like elastic body 201 and the sample B of the polishing apparatus of Fig. 4 which is the first embodiment described above. As shown in Fig. 8(a), the polishing cloth 2 has a configuration where resin pellets 205, 205 ... are embedded in a surface of a second elastic body 204 such as flexible urethane rubber a surface of which contacts the sample B.
  • the elastic body 201 made of chloroprene rubber is interposed between the polishing cloth 2 and the polishing table 1 (Fig. 4).
  • the resin pellets 205, 205 ... pellets made of polyvinyl chloride or polyethylene and having a spherical shape of a diameter of 0.3 mm are used.
  • the sample B has a configuration where wirings 54, 54 ... and an insulating film 53 are formed on a silicon wafer 51.
  • the insulating film 53 on the surface is polished.
  • the surface of the sample B is irregular because of the wirings 54, 54 of the polishing cloth 2 selectively polish convex portions of the insulating film 53, and do not contact concave portions. This improves the flatness of the sample B in a microscopic view point.
  • Fig. 8(b) is a diagrammatic section view showing in a macroscopic view point the polishing cloth 2, the annular disk-like elastic body 201 and the sample B shown in Fig. 8(a).
  • the resin pellets 205, 205 ... and the wirings 54, 54 ... are omitted.
  • the second elastic body 204 of the polishing cloth 2 elastically deforms so that the shape of the polishing cloth 2 deforms along the shape of the surface of the sample B in a macroscopic view point, whereby the degree of the polishing on the surface of the sample B is uniformalized.
  • the resin pellets are harder than the second elastic body, and spherical pellets made of polyvinyl chloride or polyethylene and having a diameter of 0.3 mm are used.
  • the resin pellets may be those in which polyvinyl chloride, polyethylene or the like contains particles such as Al 2 O 3 , CeO 2 or diamond of a particle diameter of 1.0 ⁇ m or less.
  • the resin pellets 205, 205 ... of the polishing cloth 2 are embedded in the surface of the second elastic body 204 in the side of the sample B.
  • the resin pellets may be fixed and attached to an adhesive face formed on a surface of, for example, the second elastic body 204 in the side of the sample B.
  • Fig. 9 is a diagrammatic section view showing one portion of a fifth embodiment of a polishing apparatus which is an embodiment of the invention. More specifically, Fig. 9 is a section view showing on an enlarged scale the polishing cloth 2, the annular disk-like elastic body 201 and the sample B of the polishing apparatus of Fig. 4 which is the first embodiment described above. As shown in Fig. 9, the polishing cloth 2 has a configuration where concave portions 206a, 206a ... are formed in the side of a second elastic body 206 which contacts to the sample B.
  • the second elastic body 206 is a pad of a thickness of 1.5 mm which may be formed by, for example, impregnating urethane rubber into nonwoven fabric and hardening it.
  • the sample B has a configuration where wirings 54, 54 ... and an insulating film 53 are formed on a silicon wafer 51. While a polishing reagent 8 in which ultrafine particles of SiO 2 (average particle diameter: about 0.05 ⁇ m to 0.2 ⁇ m) are suspended in a weak alkaline (from pH 10 to pH 12) liquid is supplied at 3 liters/min. to the face to be polished, a polishing table 1 is rotated at 2000 rpm, and a sample holder 3 onto which the sample B is mounted is rotated at 200 rpm.
  • a polishing reagent 8 in which ultrafine particles of SiO 2 (average particle diameter: about 0.05 ⁇ m to 0.2 ⁇ m) are suspended in a weak alkaline (from pH 10 to pH 12) liquid is supplied at 3 liters/min. to the face to be polished, a polishing table 1 is rotated at 2000 rpm, and a sample holder 3 onto which the sample B is mounted is rotated at 200 rpm.
  • a polishing is conducted in the same manner as the above-described first embodiment.
  • the second elastic body 206 of the polishing cloth 2 since the second elastic body 206 of the polishing cloth 2 is hard, it does not follow microscopic irregularities, and therefore the flatness of the sample B in a microscopic view point is improved. Since the concave portions 206a, 206a ... of the polishing cloth 2 are formed, the shape of the polishing cloth 2 deforms along the shape of the surface of the sample B, whereby the degree of the polishing on the surface of the sample B is uniformalized in a macroscopic view point.
  • the openings of the concave portions formed in the second elastic body 206 of the polishing cloth 2 used in embodiment 5 described above have the size of 0.1 mm ⁇ 0.1 mm.
  • the invention is not restricted to this.
  • the concave portions may be groove-like ones.
  • convex portions may be formed in the surface of the second elastic body 206 in the side of the sample B.
  • Fig. 10 is a graph showing level differences measured each time when a surface of a sample was polished by the polishing apparatus one portion of which is shown in Fig. 8(a).
  • the ordinate indicates the level difference of the surface
  • the abscissa indicates the position (size) of wiring patterns.
  • an annular disk-like elastic body, a disk-like elastic body one face of which is spherical, or a fluid is interposed between a polishing table and a polishing cloth. Therefore, the contacting state between the face of the polishing cloth and a face of a sample to be polished becomes uniform, so that the flatness of the sample can be improved. Moreover, since the pressure of the fluid can be controlled, the pressing force of the face of the polishing cloth against the face of the sample to be polished can easily be controlled.
  • a gap is formed between the face of the polishing cloth and a face of a sample to be polished, and a polishing is conducted while supplying a polishing reagent into the gap. Therefore, a load applied to the sample is reduced, the smoothness of the sample is improved, and a polishing distortion is reduced.
  • the polishing cloth is provided with a second elastic body, and resin pellets and/or polishing particles are embedded or attached to the sample-contacting face of the elastic body. Therefore, a sample can be polished so as to have a thickness which is uniform in a macroscopic view point, and the flatness in a microscopic view point of the face of the sample to be polished can be improved. Moreover, the use of the polishing cloth of a second elastic body in which convex portions, concave portions or groove portions are formed on the sample-contacting face provides effects that a sample can be polished so as to have a thickness which is uniform in a macroscopic view point, and that the flatness in a microscopic view point of the face of the sample to be polished can be improved.
  • an elastic portion is interposed between a polishing table and a polishing cloth, and further the polishing cloth is provided with a second elastic body, thereby attaining an effect that the flatness of a sample can be further improved.

Claims (4)

  1. Poliervorrichtung mit
    einem drehenden Werkstückhalter (3), bei dem ein flaches plattenartiges Werkstück (B, 51, 53) gehalten ist,
    einem mit einem Poliertuch (2, 206) versehenen drehenden Poliertisch (1) zum Polieren des flachen plattenartigen Werkstücks (B, 51, 53), und
    einer an dem Poliertisch (1) angebrachten elastischen Einrichtung,
    dadurch gekennzeichnet, daß
    die elastische Einrichtung aus einem ersten elastischen Körper (201, 202, 203) besteht, der zwischen dem Poliertisch (1) und dem Poliertuch (2, 206) angeordnet ist, und daß das Poliertuch (2) aus einem zweiten elastischen Körper (204, 206) besteht, bei dem konkave oder rillenförmige oder alternativ konvexe Bereiche in einer Kontaktfläche des elastischen Körpers (204, 206) mit dem flachen, plattenartigen Werkstück (B, 51, 52) ausgebildet sind, so daß sich das Poliertuch (2) entlang der Form des Werkstücks (B, 51, 52) in mikroskopischen Dimensionen verformen kann.
  2. Poliervorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Spannung des Poliertuchs (2, 206) durch eine Befestigungseinrichtung (101, 102, 103, 104) eingestellt ist, die wenigstens im Umfangsbereich des Poliertuchs (2, 206) oder im Umfangsbereich und im Mittelbereich des Poliertuchs (2, 206) vorgesehen ist.
  3. Poliervorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Spannung des Poliertuchs (2, 206) durch die Befestigungseinrichtung (101, 102, 103, 104) unter Verformung des ersten elastischen Körpers (201, 202, 203) eingestellt ist.
  4. Poliervorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der erste elastische Körper (201, 202, 203) ein ringförmiger, plattenartiger elastischer Körper ist und das Poliertuch (2, 206) an dem Poliertisch (1) durch Befestigungsringe (102, 103), die den Umfangsrand des Poliertuchs (2, 206) mittels mehrerer Befestigungsbolzen (104) klemmen, und durch eine Befestigungsplatte (101) befestigt ist, die einen Mittelbereich des Poliertuchs (2, 206) klemmt, und daß die Zugspannung des Poliertuchs(2, 206) durch das Anziehen der Befestigungsbolzen (104) eingestellt ist.
EP93904297A 1992-02-12 1993-02-12 Schleifvorrichtung und verfahren zur verwendung desselben Expired - Lifetime EP0607441B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP59292/92 1992-02-12
JP5929292 1992-02-12
JP05023035A JP3024417B2 (ja) 1992-02-12 1993-02-10 研磨装置
JP23035/93 1993-02-10
PCT/JP1993/000173 WO1993015878A1 (en) 1992-02-12 1993-02-12 Abrading device and abrading method employing the same

Publications (3)

Publication Number Publication Date
EP0607441A1 EP0607441A1 (de) 1994-07-27
EP0607441A4 EP0607441A4 (en) 1994-08-24
EP0607441B1 true EP0607441B1 (de) 1998-12-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93904297A Expired - Lifetime EP0607441B1 (de) 1992-02-12 1993-02-12 Schleifvorrichtung und verfahren zur verwendung desselben

Country Status (3)

Country Link
EP (1) EP0607441B1 (de)
DE (1) DE69322491T2 (de)
WO (1) WO1993015878A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3708167B2 (ja) * 1995-05-17 2005-10-19 株式会社荏原製作所 研磨布及び該研磨布を備えたポリッシング装置
JPH10235552A (ja) 1997-02-24 1998-09-08 Ebara Corp ポリッシング装置
JP2918883B1 (ja) * 1998-07-15 1999-07-12 日本ピラー工業株式会社 研磨パッド
US6439968B1 (en) * 1999-06-30 2002-08-27 Agere Systems Guardian Corp. Polishing pad having a water-repellant film theron and a method of manufacture therefor
DE10303407A1 (de) 2003-01-27 2004-08-19 Friedrich-Schiller-Universität Jena Verfahren und Vorrichtung zur hochgenauen Bearbeitung der Oberfläche eines Objektes, insbesondere zum Polieren und Läppen von Halbleitersubstraten
CN109277933A (zh) * 2018-10-18 2019-01-29 浙江晶盛机电股份有限公司 一种硅片外圆表面抛光装置及抛光方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5590263A (en) * 1978-12-26 1980-07-08 Nippon Telegr & Teleph Corp <Ntt> Device for flatly and accurately polishing crystal substrate without causing irregularity
US4979337A (en) * 1986-10-03 1990-12-25 Duppstadt Arthur G Polishing tool for contact lenses and associated method
JPS63200966A (ja) * 1987-02-14 1988-08-19 Yoshiaki Nagaura 両面研磨方法
EP0465868B1 (de) * 1990-06-29 1996-10-02 National Semiconductor Corporation Polierscheibe mit eingestellter Schmiegsamkeit

Also Published As

Publication number Publication date
EP0607441A1 (de) 1994-07-27
DE69322491D1 (de) 1999-01-21
WO1993015878A1 (en) 1993-08-19
DE69322491T2 (de) 1999-08-26
EP0607441A4 (en) 1994-08-24

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