Source: http://www.google.com/patents/US7140088?ie=ISO-8859-1&dq=5,742,768
Timestamp: 2015-05-27 02:28:56
Document Index: 552531888

Matched Legal Cases: ['arts 79', 'art 79', 'art 79', 'arts 79', 'arts 79', 'art 82', 'art 82']

Patent US7140088 - Turning tool for grooving polishing pad, apparatus and method of producing ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsDisclosed is a turning tool for cutting circumferential grooves into a surface of a polishing pad formed of a resin material and utilized for polishing semiconductor devices. The turning tool comprising a cutting part arranged to have a tooth width within a range of 0.005–1.0 mm, a wedge angle within...http://www.google.com/patents/US7140088?utm_source=gb-gplus-sharePatent US7140088 - Turning tool for grooving polishing pad, apparatus and method of producing polishing pad using the tool, and polishing pad produced by using the toolAdvanced Patent SearchPublication numberUS7140088 B2Publication typeGrantApplication numberUS 11/360,441Publication dateNov 28, 2006Filing dateFeb 23, 2006Priority dateJul 8, 1999Fee statusLapsedAlso published asUS6869343, US7017246, US7104868, US20030119425, US20040198199, US20040198204, US20040209551, US20060137170Publication number11360441, 360441, US 7140088 B2, US 7140088B2, US-B2-7140088, US7140088 B2, US7140088B2InventorsTatsutoshi SuzukiOriginal AssigneeToho Engineering Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (54), Non-Patent Citations (1), Referenced by (3), Classifications (44), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetTurning tool for grooving polishing pad, apparatus and method of producing polishing pad using the tool, and polishing pad produced by using the tool
US 7140088 B2Abstract
(f) Ion Blowing Device Referring next to FIGS. 15A, 15B, there is shown the ion-blowing device 114 adapted to generate and blow positive ions formed by corona discharge. The ion-blowing device 114 includes a compressed air generator (not shown) and a blower nozzle 76, so that the generated positive ions are discharged through the blower nozzle 76 together with the compressed air. Alternatively, the positive ions are discharged through holes 71(a), 72(a) which will be described later. This ion-blowing device 114 is disposed in a portion of the grooving machine such that a protruded open-end portion of the blower nozzle 76 is located in the vicinity of the attached cutting tool, e.g., the fixed tool 69 or the rotative tool 57 (the multi-edged tool 74 is attached in FIGS. 15A–15C by way of example). When the foamed urethane pad 15 is subjected to the grooving process, cut fragments or chips of the foamed urethane pad 15 are likely to be electrically charged due to friction between the cutting tools and the urethane pad 15, and stick to the surface of the urethane pad 15 and the cutting tools, resulting in difficulty in removing the charged chips from the surfaces of the cutting tool and the urethane pad. To cope with this problem, the ion blowing device 114 is operated to blow the positive ions on the chips stuck to the cutting tool and the foamed urethane pad 15, while the grooving process is executed for the foamed urethane pad 15, whereby the chips are effectively neutralized and removed from the cutting tool and the urethane pad 15. When the multi-edged tool 74 of the fixed tool is used for forming simultaneously a plurality of grooves on the foamed urethane pad 15, in which a plurality of cutting edges are juxtaposed to each other, it is required to evenly blow the positive ions on the respective cutting edges so that the positive ions forcedly come into collision with the charged chips. To meet this requirement, the protruded open-end portion of the nozzle 76 may be suitably arranged.
(g) Fixed Tool (Turning Tool/Cutting Tool) (1) Turning Tool (Single Edged Tool and Multi Edged Tool) FIGS. 16A and 16B show a front and a side elevational view of the single edged tool 58 as one example of the fixed tool 69. FIGS. 17A–17C shows a bottom, a front and a side elevational view of the multi edged tool 74 as another example of the fixed turning tool 69. The single edge tool 58 and the multi edged tool 74 are suitably used for the grooving process in which the plurality of generally concentric annular grooves are formed on the surface of the foamed urethane pad 15.
(2) Cutting Tool Referring next to FIGS. 24A–24C, there are respectively shown a side elevational view, a front elevational view and a cross sectional view taken along line C—C of FIG. 24B of the cutting device 77 which is adapted to be mounted on the tool rest 18 (19) disposed on the saddle 8A (8B) of the cutting machine constructed according to the present embodiment. The cutting device 77 is operable to cut primary peripheral portion of the foamed urethane pad 15 to shape the external form of the foamed urethane pad 15 desirably. More specifically described, the cutting device 77 includes: a base 78; a fourth guide rails 63A, 63B disposed on the base 78 so as to extend parallel to each other in the Z-axis direction; a tool rest 64 disposed on the base 78 via the pair of fourth guide rails 63A. 63B so as to be movable in the Z-axis direction; a cutting tool holder 66 mounted on the tool rest 64; and a power source 62 disposed on the base 78 so as to generate a drive power by which the tool rest 64 is moved in the Z-axis direction. A cutting tool 61 is fixed to the cutting tool holder 66 such that a base portion of the cutting tool 61 is fitted into a cutting tool base 83 formed in the cutting tool holder 66, while being supported by the a pair of tool supports 65 with its protruding end portion supported by a stopper pin 80. An output member of the power source 62 is connected to a support member 67 disposed on the tool rest 64 via a connecting metal member 68, thus transmitting output power of the power source 62 to the tool rest 64. Thus, the cutting tool 61 is driven in the Z-axis direction. It should be understood that the power source 62 may comprises a piston-cylinder mechanism of pneumatics type or hydraulic type, or a solenoid-type actuator. It should be further understood that the cutting tool 61 may otherwise be constituted by a suitable turning tool for assuring further improved cutting ability of the cutting device 77.
(h) Rotative Tool (Milling Cutter and Drill) (1) Milling Cutter FIG. 25A shows a front view of one example of a milling cutter 81 for forming a fine groove, which is fixed to the grooving milling cutter unit 59. FIG. 25B shows an enlarged view of cutting parts 79 of the milling cutter 81 of FIG. 25A. The milling cutter 81 is a thin circular disk member, which has a center hole 81 a formed therethrough and a plurality of cutting part 79 integrally formed in its outer peripheral portion such that the plurality of cutting part 79 are arranged in a circumferential direction of the grooving milling cutter 81 with a uniform pitch. Each of the cutting parts 79 is dimensioned to have a wedge angle: θ5 within a range of 20–45 degrees, since the wedge angle: θ5 smaller than 20 degrees may cause undesirable shortening of the life of the grooving milling cutter 81, while the wedge angle: θ5 larger than 45 degrees may cause deterioration of cutting capability of the cutting tooth 79. Further, the each cutting parts 79 is dimensioned to have a rake angle: θ6 within a range of 30–40 degrees, more preferably at around 30 degrees, since the rake angle: θ6 smaller than 30 degrees may cause deteriorated stability of the milling cutter 81, while the rake angle: θ6 larger than 40 degrees may cause deterioration of cutting capability of the cutting tooth 79. Yet further, the each cutting tooth 79 is dimensioned to have a side cutting edge angle within a range of 0–2 degrees and a tooth width within a range of 0.3 mm–2.0 mm. The thus formed milling cutter 81 is disposed radially outwardly on a tool shaft formed on the lower portion of the grooving milling cutter unit 59 and rotated in a predetermined circumferential direction by the drive motor 126. The number of the milling cutter 81 fixed to the tool shaft is not particularly limited. For instance, a plurality of grooving milling cutters 81 may be fixed to the tool shaft with constant intervals within a range of 0.1 mm or more, so that a plurality of grooves arranged in a grid pattern are formed on the foamed urethane pad 15 with improved efficiency.
(2) Drill FIG. 26A shows a front elevational view of one example of a drill 82 to be fixed to the drill unit 65, and FIG. 26B shows an exploded view of a cutting part 82 a of the drill 82. As shown in FIG. 26A, the drill 82 has a diameter: D1 within a range of 0.5 mm–1.5 mm and a length: L1 within a range of 20–30 mm. As shown in FIG. 26B, the cutting part 82 a of the drill 81 includes two cutting edges 83, 83. The end edge portion of the drill 82 has a cone angle θ8 within a range of 55–65 degrees, more preferably at around 60 degrees, thus assuring a smooth inserting of the drill 81 into the work piece. A helix angle: θ7 of the two cutting edges 83, 83 is arranged to be held within a range of 1–10 degrees, preferably at about 5 degrees. This arrangement makes it possible to gradually cut a part of the foamed urethane pad 15 located around the edge of the drill 82, thereby forming a desired hole having a predetermined diameter. The number of the drill 82 fixed to the drill unit 65 is not particularly limited. For instance, a plurality of drill 82 may be fixed to the drill unit 65 to form a multi-shaft type drill unit, so that a plurality of holes are formed into the foamed urethane pad 15 with improved efficiency.
(i) Concentric Fine Grooves Referring next to FIGS. 27A, 27B, there is shown a polishing pad fabricated according to one preferred embodiment of the invention by way of example. The polishing pad is formed by cutting a multiplicity of generally concentric grooves into the surface of the foamed urethane pad 15 having a thickness: T1 within a range of 1.0 mm–2.0 mm. The generally concentric grooves have a width: W1 within a range of 0.005–1.0 mm, a depth: D1 within a range of 0.2–2.0 mm, and a pitch: L2 within a range of 0.2–2.0 mm. For producing the polishing pad of the present invention, initially, the single-edged cutting tool 58 or the multi-edged cutting tool 74 is fixed to the tool rest 18 (19), while a base for desired polishing pad, e.g., the foamed urethane pad 15 is placed on the suction plate 16 of the circular platen 1. Preferably, the foamed urethane pad 15 is shaped to have a circular-disk shape identical in size with the circular platen 1 in advance, by cutting. The cutting of the foamed urethane pad 15 may be executed by means of cutting device 77 fixed to the tool rest 18 (19). In the case where the foamed urethane pad 15 has a diameter smaller than the suction plate 16, an annular covering member may be placed on the outer peripheral portion of the suction plate 16 located radially outward of the foamed urethane pad 16, so that the air holes 16 a open in the outer peripheral portion of the suction plate 16 is effectively closed by the annular covering member. The suction plate 16 may be modified so that only a portion of the suction plate 16 serving for suctioning the urethane pad 15 is provided with the air holes 16 a. Alternatively, the communication grooves 16 b formed in the suction plate 16 may be partially closed so that distribution of the suction force on the suction plate 16 is divided into local sections.
As is understood from the graph of FIG. 38, the abutting pressure of the polishing pad applied on the surface of the wafer is significantly increased at open-end edge portions of each groove. Namely, a significantly high peak pressure is generated at the open-end edge portions of the each groove. As is also understood from the graph of FIG. 39, the peak pressure varies over 1.0 gf/mm2 or more under the condition of a groove width variation or error of �20%. In the case where the each groove has a relatively small width selected from a predetermined groove width range of 0.005–1.0 mm of the present invention, the groove width error of �20% means a dimensional difference within a range of 0.002–0.40 mm. This clearly shows that a high dimensional accuracy of the grooves is significantly important to assure a desired polishing ability of the polishing pad with high stability. It should be appreciated that conventional technique for grooving the polishing pad is absolutely insufficient to form such a fine multiplicity of circumferential grooves on the base for the polishing pad with high dimensional accuracy. The aforementioned high dimensional accuracy of the grooving technique of the present invention should be appreciated as a prominence effect of the present invention, which is distinguishable from the conventional grooving techniques.
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(Partial Translation).Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7234224 *Nov 3, 2006Jun 26, 2007Rohm And Haas Electronic Materials Cmp Holdings, Inc.Curved grooving of polishing padsUS7516536 *Dec 12, 2005Apr 14, 2009Toho Engineering Kabushiki KaishaMethod of producing polishing padUS8496512 *Oct 10, 2012Jul 30, 2013Iv Technologies Co., Ltd.Polishing pad, polishing method and method of forming polishing pad* Cited by examinerClassifications U.S. Classification29/557, 82/1.11, 407/67, 407/113, 407/69, 407/70, 407/117International ClassificationB23C5/08, B23C5/10, B24D18/00, B23Q1/52, B24D13/14, B23Q16/04, B24B37/26, B23P13/00, B23B27/16, B23B27/04Cooperative ClassificationY10T83/0304, B23Q16/04, B23B2210/022, B24D18/00, B23C5/10, B23C5/08, Y10T407/23, Y10T29/49995, Y10T407/2202, Y10T407/25, Y10T407/2208, B23B27/04, B23B2210/02, Y10T407/2206, B23B2220/12, B24B37/26, Y10T82/10, B23Q1/52, B23B2251/50, Y10T29/5168European ClassificationB24B37/26, B23Q1/52, B23Q16/04, B23C5/10, B23B27/04, B24D18/00, B23C5/08Legal EventsDateCodeEventDescriptionJan 20, 2015FPExpired due to failure to pay maintenance feeEffective date: 20141128Nov 28, 2014LAPSLapse for failure to pay maintenance feesJul 11, 2014REMIMaintenance fee reminder mailedMay 28, 2010FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services