摘要:
The present invention provides a polishing head 1 comprising a carrier 3, a guide ring 4, a dress ring 5, and a head body 2, wherein the head body 2 is rotatable, and holds the carrier 3, the guide ring 4, and the dress ring 5; the head body 2 has a reversed-bowl shape and has a hollow 8; the dress ring, and at least the guide ring or the carrier are held by being coupled to a lower brim of the head body via a diaphragm 6; the hollow of the head body is sealed. During polishing, the pressure of the sealed hollow is adjusted with a pressure regulating mechanism 9 communicating with the hollow, thereby elastically deforming the diaphragm. As a result, a wafer W can be polished while the wafer and the dress ring are pressed with a given pressing force against a polishing pad 11 on a turn table 12 with rotating the wafer held by the carrier and the dress ring. Consequently, there is provided a polishing head or the like with which excessive polishing in the outer periphery of a semiconductor wafer can be prevented and generation of impressions or scratches in the edge portion of the wafer can be prevented effectively.
摘要:
The present invention provides a polishing head 1 comprising a carrier 3, a guide ring 4, a dress ring 5, and a head body 2, wherein the head body 2 is rotatable, and holds the carrier 3, the guide ring 4, and the dress ring 5; the head body 2 has a reversed-bowl shape and has a hollow 8; the dress ring, and at least the guide ring or the carrier are held by being coupled to a lower brim of the head body via a diaphragm 6; the hollow of the head body is sealed. During polishing, the pressure of the sealed hollow is adjusted with a pressure regulating mechanism 9 communicating with the hollow, thereby elastically deforming the diaphragm. As a result, a wafer W can be polished while the wafer and the dress ring are pressed with a given pressing force against a polishing pad 11 on a turn table 12 with rotating the wafer held by the carrier and the dress ring. Consequently, there is provided a polishing head or the like with which excessive polishing in the outer periphery of a semiconductor wafer can be prevented and generation of impressions or scratches in the edge portion of the wafer can be prevented effectively.
摘要:
A method for manufacturing a polishing head having an annular rigid ring; a rubber film bonded to the rigid ring with uniform tension; a mid plate joined to the rigid ring, forming a space together with the rubber film and the rigid ring; and a mechanism for changing pressure of the space, the method including performing a tensile test on the rubber film according to JIS K6251 before bonding the rubber film to the rigid ring, and selecting the rubber film having a value of 10 MPa or less of an inclination obtained by a linear approximation of a stress-strain curve within a strain value of 5%; and bonding the selected rubber film having a value of 10 MPa or less of the inclination to the rigid ring to manufacture the polishing head.
摘要:
The present invention provides a process for manufacturing a semiconductor wafer capable of effectively reducing unevenness having a wavelength of 0.5 mm or more which remains on a surface of the semiconductor wafer after a first polishing step and improving flatness thereof; and a semiconductor wafer manufactured by the manufacturing process. The manufacturing process comprises: plural polishing steps including a first polishing step and a final polishing step; and a corrective polishing step performed after the first polishing step using a polishing cloth harder than that used in the first polishing step.
摘要:
A polishing head for holding a workpiece when a surface of the workpiece is polished and a polishing apparatus provided with the polishing head, and more particularly a polishing head for holding the workpiece on a rubber film and a polishing apparatus provided with the polishing head. The polishing head and the polishing apparatus provided with the polishing head that can adjust the polishing profile on the basis of the shape of the workpiece before polishing and can stably obtain good flatness.
摘要:
A polishing head for holding a workpiece when a surface of the workpiece is polished and a polishing apparatus provided with the polishing head, and more particularly a polishing head for holding the workpiece on a rubber film and a polishing apparatus provided with the polishing head. The polishing head and the polishing apparatus provided with the polishing head that can adjust the polishing profile on the basis of the shape of the workpiece before polishing and can stably obtain good flatness.
摘要:
The present invention is a polishing head in which a rubber film is formed in a boot shape in such a manner that a position where the rubber film is held by a mid plate is distantly positioned from a work holding portion; an end portion of the boot shaped rubber film is formed in O-ring shape so that the rubber film is held by the mid plate with decreasing an area of contact between the mid plate and the rubber film as much as possible. As a result, there is provided a polishing head with rubber chuck method in which an occurrence of a surface defect, such as a scratch, on a surface of the work is suppressed as much as possible and the work can be uniformly and stably polished to the outer periphery.
摘要:
The present invention is a polishing head in which a rubber film is formed in a boot shape in such a manner that a position where the rubber film is held by a mid plate is distantly positioned from a work holding portion; an end portion of the boot shaped rubber film is formed in O-ring shape so that the rubber film is held by the mid plate with decreasing an area of contact between the mid plate and the rubber film as much as possible. As a result, there is provided a polishing head with rubber chuck method in which an occurrence of a surface defect, such as a scratch, on a surface of the work is suppressed as much as possible and the work can be uniformly and stably polished to the outer periphery.
摘要:
A polishing head including, below a polishing head body, a rubber film held by a disk-shaped mid plate and an annular guide ring disposed around the rubber film holding the back surface of the workpiece on a lower face portion of the rubber film. The polishing head also includes a base member that is coupled to a polishing head body through an elastic film and holds the guide ring and the mid plate such that the lower surface of the guide ring does not contact the polishing pad during polishing. The polishing head and polishing apparatus, are operable in both of the rough polishing process and final polishing process, that can stably achieve predetermined high flatness and high polishing stock removal uniformity in polishing of a workpiece and can obtain a workpiece with fewer fine particles having a diameter of 45 nm or more.
摘要:
Oxazole derivatives of the formula (I) ##STR1## wherein one of R and R.sub.1 is a methylsulfonylphenyl, an aminosulfonylphenyl or an alkylaminosulfonylphenyl, and the other is a cycloalkyl having 5 to 7 carbon atoms which is optionally substituted by lower alkyl, a thienyl optionally substituted by lower alkyl or halogen atom or a furanyl optionally substituted by lower alkyl or halogen atom, and R.sub.2 is a lower alkyl, and pharmaceutically acceptable salts thereof. The oxazole derivatives and pharmaceutically acceptable salts thereof have superior antipyretic action, analgesic action, anti-inflammatory action, and particularly, selective inhibitory action on cyclooxygenase-2 (COX-2), and are expected to be useful as an antipyretic agent, an analgesic agent and an anti-inflammatory agent with less side-effects such as disorders in the digestive tract.