摘要:
By improving the material of workpiece holder body of a workpiece holder for polishing that holds a workpiece by vacuum adsorption, and the material of resin film for coating a workpiece holding surface of the holder, and developing a method for coating the surface with a resin, which does not cause blocking of perforated holes of the holder body with the resin during the resin coating process, there are provided a workpiece holder for polishing having a workpiece holding surface of high precision, and a method for producing it. According to the present invention, there are provided a workpiece holder for polishing having a workpiece holder body provided with multiple perforated holes for holding a workpiece by vacuum adsorption, wherein a holding surface of the holder body is coated with a coating film formed by applying a thermosetting resin on the holding surface and curing it with heating, and a surface of the coating film is polished, and a method for producing it.
摘要:
A workpiece holder for polishing comprising a workpiece holder body which is provided with multiple perforated holes for holding a workpiece by vacuum suction and a holder back plate which is closely contacted with a back face of the holder body and has grooves for vacuum, wherein the holder back plate is composed of a synthetic resin and has an Asker C hardness of 70 or higher but lower than 98, and an apparatus for polishing a workpiece and a method for polishing a workpiece utilizing it. By improving the material of holder back plate of a workpiece holder for polishing that holds a workpiece by vacuum suction to enhance sealing with the holder body, thereby developing such a holder back plate that should not transfer deformation of the holder body to the workpiece surface, even if polishing agent slurry is introduced and solidified, to provide a workpiece holder for polishing having a workpiece holding surface of high precision, an apparatus for polishing a workpiece and a method for polishing a workpiece.
摘要:
A polishing method and a polishing apparatus that are for making contact pressure between a work and a polishing pad substantially uniform within surfaces to obtain a work having good quality. A turn table (2) is supported by a grooved surface of a turn table receiving member (3b), the grooved surface being provided with grooves (9b) in a straight direction, a work (W) is pressed against a polishing pad (8) adhered to the turn table (2) while flowing polishing slurry, and a polishing is carried out by rotating the work (W) and the turn table (2).
摘要:
There is disclosed a method of processing a work comprising polishing a work holding surface 4a of a work holding plate 4 by contacting and rubbing a work holding surface 4a of a work holding plate 4 with a polishing pad 2 attached on a polishing turn table 1 with providing polishing agent 5 thereto, holding a wafer W on said work holding surface 4a by vacuum-holding, and contacting and rubbing the wafer W with said polishing pad 2 to polish the work with providing polishing agent 5 wherein temperature of the polishing agent 5 or the polishing turn table 1 is controlled by temperature controller 7,9 so that a temperature of said work holding surface 4a when polishing said work holding plate 4 and a temperature of said work holding surface 4a when polishing the wafer w are controlled to be the same. Degradation of flatness due to thermal influence when polishing the holding plate and polishing the wafer can be prevented in a method of processing comprising polishing the work holding surface of the work holding plate to conform with the deformed shape of the polishing pad, holding a work with the work holding surface, and polishing the work.
摘要:
A workpiece holder for polishing includes a workpiece holder body having multiple perforated holes to hold a workpiece by vacuum suction. A holding surface of the workpiece holder body may be coated with resin. A coefficient of thermal expansion of the resin coating on the holding surface may be 1×10−5/K or less. The resin coating on the holding surface may be epoxy resin filled with silica particles.
摘要:
A method of polishing semiconductor wafers and apparatus therefore are described. According to the present invention, a semiconductor wafer mounted on the lower side of a wafer mounting plate may be polished on a polishing pad by the front referenced polishing technique due to a flexibility of the wafer mounting plate to make the same to conform in detail with the backside contour of the wafer under polishing pressure and a selected flexibility differential between a wafer holding region and the outer moving region of the wafer mounting plate. An apparatus includes the wafer mounting plate that also works as a vacuum chuck plate is constructed out of a flexible thin disc of hard plastics, a central round region is used for a wafer holding region facing the backside of the wafer and the outside annular region is more flexible to work as a moving region, a pan-shaped rubber sheet is secured to a ring projection, the wafer mounting disc is adhered to the inner periphery of the rubber sheet at and along the periphery thereof to generate a sealed space, passes for vacuum communication and for a compressed air supply are formed through a rotary shaft, and vacuum chuck holes are communicated with the vacuum pass and the compressed air pass is in communication with a sealed space in the wafer holder.
摘要:
A polishing apparatus is provided which can effect surface-based polishing of a wafer without causing the wafer to produce an undulation or peripheral protrusion. A sheetlike polishing member 5 constructed by superposing a foam sheet 2 containing minute closed cells in a web of chloroprene rubber and a velour type non-woven fabric (polishing cloth 3) is attached fast to the surface of a polishing table 1. The polishing member is capable of polishing a given wafer while maintaining the uniformity of thickness of the wafer or an oxide film formed on the surface of the wafer because, during the application of pressure by a pressing member 14, the polishing pressure is uniformly distributed throughout the entire rear surface of the wafer and the polishing member is bent in conformity with the global rises and falls in the wafer surface.
摘要:
Novel xanthine compounds represented by the following formula: ##STR1## wherein each of R.sup.1, R.sup.2 and R.sup.3 independently represents hydrogen or lower alkyl;each of X.sup.1 and X.sup.2 independently represents oxygen or sulfur; and Q represents: ##STR2## The compounds are useful as a diuretic, a renal-protecting agent and bronchodilator.
摘要:
A confocal scanning microscope including: an objective system (second objective lens 23 and objective lens 24) illuminating a sample SA with illumination light; a scanning mechanism 31 scanning the sample SA to obtain an intensity signal; and a scanning optical system 32 provided between the scanning mechanism and the objective system. The scanning optical system composed of, in order from the scanning mechanism side, a first positive lens group G1, a second negative lens group G2, and a third positive lens group G3. The third lens group has two chromatic aberration correction portions each formed by a positive lens and a negative lens or negative lens and positive lens. Glass materials are selected such that one performs chromatization and the other performs achromatization, thereby providing a confocal scanning microscope capable of correcting lateral chromatic aberration generated in the objective system in the specific wavelength region by the scanning optical system.
摘要:
Provided are a radio communication system, a receiver, and a transmitter, which are capable of reducing an operation time period of a reception circuit of the receiver and achieving reduction in power consumption even if there is a clock error between the transmitter and the receiver. In a case of a conventional method illustrated in FIG. 1(A), the receiver is operated earlier by a time period (Tm), to thereby achieve synchronization before the clock error of the receiver exceeds the time period (Tm). This requires an extended reception time period for achieving clock synchronization, which therefore prevents the receiver from reducing its power consumption. In view of this, according to the present invention, as illustrated in FIG. 1(B), a synchronization signal is continuously transmitted from the transmitter a plurality of times in a short period of time, and the receiver receives only one of the continuously-transmitted synchronization signals. With this, the receiver can achieve synchronization of a reference clock by starting a reception operation earlier only by a time period (Tm′) (Tm′≦Tm).