Source: http://www.google.com/patents/US7516536?dq=6377161
Timestamp: 2016-04-30 01:49:33
Document Index: 622494869

Matched Legal Cases: ['Application No. 2004', 'arts 58', 'arts 58', 'arts 58', 'arts 58', 'arts 58', 'arts 58', 'arts 58', 'arts 58', 'arts 58', 'arts 58']

Patent US7516536 - Method of producing polishing pad - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA method of manufacturing a grooved polishing pad wherein a large number of grooves, extending parallel to each other, are fabricated at specific intervals on at least one of a front surface and a back surface of a polishing pad substrate through a groove cutting process on the polishing pad substrate...http://www.google.com/patents/US7516536?utm_source=gb-gplus-sharePatent US7516536 - Method of producing polishing padAdvanced Patent SearchPublication numberUS7516536 B2Publication typeGrantApplication numberUS 11/301,361Publication dateApr 14, 2009Filing dateDec 12, 2005Priority dateJul 8, 1999Fee statusPaidAlso published asUS20060154577Publication number11301361, 301361, US 7516536 B2, US 7516536B2, US-B2-7516536, US7516536 B2, US7516536B2InventorsTatsutoshi SuzukiOriginal AssigneeToho Engineering Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (64), Non-Patent Citations (1), Referenced by (3), Classifications (15), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetMethod of producing polishing pad
US 7516536 B2Abstract
A method of manufacturing a grooved polishing pad wherein a large number of grooves, extending parallel to each other, are fabricated at specific intervals on at least one of a front surface and a back surface of a polishing pad substrate through a groove cutting process on the polishing pad substrate which is made from a synthetic resin material, the method comprising the steps of: cutting, by using a multi-edged tool having a plurality of pad groove machining cutting parts, arrayed at equal spacing p with the spacing p being an integer multiple no less than 2 of a desired spacing d of the grooves, a plurality of the grooves; and repeating the cutting of the plurality of grooves through shifting the multi-edged tool in a direction in which the pad groove machining cutting parts are arrayed, in order to fabricate the large number of grooves, extending parallel to each other, with the desired spacing d.
This is a Continuation-in-Part of application Ser. No. 10/830,567 filed Apr. 23, 2004, now U.S. Pat. No. 7,104,868, incorporated herein by reference and which is a Divisional of application Ser. No. 10/026,504 filed Dec. 19, 2001, now U.S. Pat. No. 6,869,343.
The disclosure of Japanese Patent Application No. 2004-359025 filed on Dec. 10, 2004 including the specification, drawings and abstract is incorporated herein by reference in its entirety.
It is therefore one object of this invention to provide a new method of manufacturing a grooved polishing pad, capable of fabricating a large number of grooves with a narrow groove gap and capable of producing a polishing pad that provides high-precision polishing.
Given the method for manufacturing grooved polishing pads according to the present mode, having the grooves that are formed in the polishing pad substrates be circumferential grooves that extend in the circumferential direction enables the specific grooves to be achieved easily through a turning process. Note that the “circumferential grooves that extend in the circumferential direction of the polishing pad substrate” in the present mode are, for example, grooves that extend in concentric circles, grooves that extend in a spiral shape, grooves that extend windingly in the circumferential direction in a petal shape, a star shape and a polygon shape, and so forth.
Note that in the present mode, the distance of the position of the curve from the blade edge is set so as to be less than the depth dimension desired for the groove to be fabricated, thereby enabling the cutting part to demonstrate the effects of suppressing interferences with the inside surfaces of the grooves on both edges of the cutting part in the transverse direction. Here the “position of 0.05 mm to 1.0 mm from the blade edge, where the curve is formed” in the present mode indicates the height position in the direction of depth of the pad groove. Consequently, the position of the curve on the face of the front clearance face is determined by the magnitude of the front clearance angle. In other words, if the front clearance angles relative to the piece being cut are different, then the height positions of the curves will also be different, even if the cutting parts have the same wedge angles.
The foregoing and/or other objects features and advantages of the invention will become more apparent from the following description of preferred embodiments with reference to the accompanying drawings, in which like numerals are used to represent like elements and wherein:
In the method for manufacturing described above, the use of a multi-edged tool that has a blade edge spacing p that is an integer multiple of the groove spacing d enables the fabrication of grooves with the specific groove spacing d. Consequently, when fabricating, in a polishing pad 15, grooves that have a small groove spacing d in order to achieve a required high precision polishing, it is possible to provide a large blade edge spacing in the multi-edged tool 74, making it possible to manufacture the cutting parts 58 a of the multi-edged tool 74, which has tended to be difficult because of the spacing p being narrow, with relative ease and with high precision. Moreover, providing a relatively large spacing p for the cutting parts 58 a of the multi-edged tool 74 enables the positions between adjacent cutting parts 58 a in the multi-edged tool 74 to be wide, enabling the heat due to friction between the cutting parts 58 a and the polishing pad 15 to be dispersed in this wide area, thereby making it possible to reduce or eliminate effectively the pad deformation and reduction in polishing performance caused by the effects of concentrated frictional heating. Furthermore, because the spacing p of the cutting parts 58 a of the multi-edged tool 74 can be made relatively large, the amount of airflow between the cutting parts 58 a can be increased, which can produce beneficial cooling of the cutting parts 58 a through the flow of air, making it possible to effectively reduce or avoid reductions in polishing precision due to the generation of heat in the polishing pad 15. In particular, in the present form of embodiment, an “ion blow” is performed wherein air that includes negative ions (in the present embodiment the air is ionized to include positive ions and negative ions) is blown onto the cutting parts 58 a to not only achieve more effective cooling of the cutting parts 58 a, but to also make it possible to control the occurrence of static electricity at the cutting location, enabling the effective prevention of reductions in cutting precision due to, for example, the adherence of shavings within the grooves.
Note that this type of “ion blow,” as shown in FIG. 15, may be performed by blowing from the side of the multi-edged tool 74. However, preferably the ionic air should be blown from behind the blade edges of the multi-edged tool 74, in the direction of cutting, as shown, for example, in FIGS. 41A, B, and C. That is, blowing the air stream from behind can prevent shavings from getting between the cutting parts 58 a and melting and adhering due to frictional heating. In particular, as is shown by the double dotted lines in FIGS. 41B and C, it is preferable to position the opening of a vacuum tube negative pressure suction opening 300 in front of the blade edges of the multi-edged tool, in the direction of cutting, so that the shavings will be vacuumed away and removed from the cutting work area as quickly as possible by this negative pressure suction aperture 300.
Next, a comparative investigation will be performed regarding the amount of tool interference when fabricating ring-shaped grooves using cutting fabrication for a cutting tool with a conventional structure vs. a cutting tool with the structure according to the present invention. Note that for the sake of brevity, the comparative investigation will focus on the distance of separation from the blade edge part in the direction of cutting at the front clearance face, or in other words, will focus on the front-back width of the cutting tool in the direction of cutting, rather than considering the blade width.
w1=0.3/tan 50�
w2=(1−0.3)/tan 60�
W=w1+w2=0.656 [Equation 1]
Accordingly, using the cutting tool 310 according to the present invention causes the amount of interference x1 with the inner wall surface, when forming the ring-shaped groove 313, as described above, through cutting, to be 0.021 mm. On the other hand, when the same calculation is performed for a cutting tool according to the conventional structure, which is formed with a constant wedge angle of θ=20�, without having the curve 318, the amount of interference x2=0.017. As is clear from these calculations, the structure according to the present invention has many effects, as described above, through maintaining the cutting angle θ1 of the blade edge part even while keeping the effect on the tool interference low.
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(Partial Translation).Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8496512 *Oct 10, 2012Jul 30, 2013Iv Technologies Co., Ltd.Polishing pad, polishing method and method of forming polishing padUS9180570Mar 16, 2009Nov 10, 2015Nexplanar CorporationGrooved CMP padUS20130074767 *Sep 17, 2012Mar 28, 2013Shincron Co., Ltd.Thin film forming apparatus* Cited by examinerClassifications U.S. Classification29/558, 409/293, 82/1.11, 409/304, 409/345International ClassificationB23P15/00Cooperative ClassificationY10T409/509348, Y10T29/49996, Y10T82/10, Y10T409/502624, B24D18/00, Y10T409/50082, B24B37/26European ClassificationB24B37/26, B24D18/00Legal EventsDateCodeEventDescriptionMar 21, 2006ASAssignmentOwner name: TOHO ENGINEERING KABUSHIKI KAISHA, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SUZUKI, TATSUTOSHI;REEL/FRAME:017695/0367Effective date: 20051228Oct 1, 2012FPAYFee 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