BACKGROUNDART In the production of semiconductor devices, it is necessary to polish semiconductor wafers by means of a polisher to thereby flatten a surface thereof onto which semiconductor circuits are provided.

A typical polisher of this type inclues a turn table provided with a polishing pad on an upper surface thereof, a drive shaft fixedly connecte to the center of a lower surface of the turn table for drivingly rotating the turn table about its axis, a wafer carrier for holding a semiconductor wafer in contact with an upper polishing surface of the polishing pad to polish the wafer, and a slurry nozzle for supplying slurry onto the polishing surface to effect a polishing operation mechanically and chemically by a combination of the polishing pad and the supplie slurry. It is therefore desirable for a turn table of such a type of polisher to be positively cooled in order to deprive the polishing pad of heat generated in a polishing operation, although the polishing pad is cooled by the slurry to some extent. Consequently, it is conventional for such a polisher to be provided with a cooling system including a cooling fluid path extending inside of the turn table for flowing

therethrough a cooling fluid received from an outside cooling fluid supply.

However, since a fluid coupler provided in the cooling system to receive a cooling fluid from an outside cooling supply is conventionally located in a drive shaft which is connecte to a drive mechanism for driving the shaft, the construction of a combination of the drive shaft and those devices associated with the shaft is complicated thereby causing problems of cost, maintenance and so on.

An object of the present invention is therefore to solve such problems as are involved in such a conventional polisher.

DISCLOSURE OF INVENTION In accordance with the present invention, a polisher comprises a turn table having first and second end surfaces which are substantially normal to an axis of the turn table. The first end surface defines a polishing surface for polishing an article. A drive shaft is connecte to the turn table in such a manner that the shaft extends along the axis of the turn table outwardly from the second end surface of the turn table. The polisher further inclues a cooling system which comprises a cooling fluid path provided in the turn table for passing a cooling fluid therethrough to deprive the polishing surface of heat generated in a polishing operation and a fluid coupler provided at the center of the first end surface of the turn table for fluidly connecting the cooling fluid path with a cooling fluid supply outside of the turn table.

In a preferred embodiment, the turn table comprises a rotatable disc and a disc-like polishing member such as a synthetic resin polishing pad, a grindstone disc or the like axially aligned with the rotatable disc. The

rotatable disc defines the above-noted second end surface of the turn table and the polishing member defines the polishing surface. The cooling system inclues a cooling disc provided between the polishing member and the rotatable disc in which the above-stated cooling fluid path is formed. The cooling disc is removably connecte to the rotatable disc. Alternatively, the cooling disc may be integrally formed with or integrally incorporated into the rotatable disc. The polishing member is provided with an opening at the center of the polishing member thereby exposing the center portion of the cooling fisc, and the fluid coupler is mounted on the center portion of the cooling disc exposed by the opening. The fluid coupler may include a rotatable coupler body which is fixedly mounted on the center portion of the cooling disc and has a connection path fluidly connecte to the cooling fluid path in the cooling disc and a stationary central member rotatably connecte to the coupler body at the center of the coupler body thereby enabling the coupler body to rotate together with the cooling disc relative to the stationary central member. The stationary central member inclues a fluid path having a first end port adapted to be fluidly connecte to the cooling fluid supply and a second end port fluidly connecte to the connecting path in the coupler body.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross sectional side elevational view of a polisher in accordance with a preferred embodiment of the present invention, Fig. 2 is an enlarged sectional side elevational view of an important portion of a cooling system adopted in the polisher shown in Fig. 1, and

Fig. 3 is a plan view of a coupler body of the cooling system shown in Fig. 2.

BEST MODE FOR CARRYING OUT THE INVENTION A polisher 10 shown in Fig. 1 inclues a turn table 12 having an upper polishing surface 16, a vertical drive shaft 20 connecte to a lower surface 22 of the turn table at the center thereof for rotatably driving the turn table, a wafer carrier 26 for holding a semiconductor wafer W in contact with the polishing surface 16 and a nozzle 30 for supplying a slurry onto the polishing surface 16. As shown, the turn table 12 of the polisher 10 inclues a rotatable disc 52 defining the above-stated lower surface 22 of the turn table, and a polishing member 54 such as a synthetic resin polishing pad, a grindstone disc or the like provided over an upper surface 56 of the rotatable disc 52 the upper surface of which constitutes the above-stated polishing surface 16. In operation, the turn table 12 and the wafer carrier 26 are rotated about their respective axes, while supplying a slurry through the nozzle 30, whereby the wafer is polished mechanically and chemically by a combination of the polishing surface 16 and the supplie slurry.

The polisher 10 in accordance with the present invention further inclues a cooling system 60 for cooling the polishing member 54 to deprive the polishing surface 16 of a heat generated by friction between the wafer W and the polishing surface 16 in a polishing operation as stated above.

Specifically, the cooling system 60 inclues a cooling disc 64 provided between the polishing member 54 and the rotatable disc 52 which cooling disc inclues a cooling fluid path 68 provided therein and a fluid coupler 70

provided on the cooling disc 64 at the center thereof for fluidly connecting the cooling fluid path 68 in the cooling disc with a cooling fluid supply (not shown) outside of the turn table. The cooling disc 64 is removably fastened to the rotatable disc 52 by bolts 71 located along the periphery of the cooling disc and the polishing member 54 is adhered to the upper surface of the cooling disc. The cooling disc 64 may be integrally incorporated into or integrally formed with the rotatable disc 52.

The cooling fluid path 68 is in the form of a round-trip path and inclues a plurality sending paths 74 which extend in radial directions of the cooling disc 64 and are spaced from each other in a circumferential direction of the same and a plurality of return paths 76 which also extend radially and are connecte to the sending paths 74 at around the periphery of the cooling disc. As shown, the sending paths 74 are positioned closer to the polishing member 54 than the return-paths taking a cooling efficiency into consideration.

The fluid coupler 70 inclues a rotatable coupler body 80 fixedly mounted on the center portion of the cooling disc 64 and having a sending connection path 82 and a return connection path 84 which are respectively connecte to the sending paths 74 and the return paths 76 of the cooling disc.

The coupler 70 further inclues a stationary cylindrical central member 86 inserted into a vertical hole 88 formed at the center of the rotatable coupler body 80 in such a manner that the rotatable coupler body 80 can rotate about its axis together with the rotatable disc 52 relative to the stationary central member 86. The stationary central member has a sending path 90 and a

return path 92 respectively adapted to fluidly connect the sending connection path 82 and the returnconnection path 84 in the coupler body 80 to the cooling fluid supply (not shown) through pipes 100,102 connecte thereto so as to form a circular path for supplying a cooling fluid from the supply to the cooling disc 64 through the sending path 90, the sending connection path 82 and the sending paths 74 and for returning the cooling fluid from the cooling disc to the cooling fluid supply through the return paths 76, the return connection path 84 and the return path 92 in order to cool the returned cooling fluid. The outlets of the sending path 90 and the return path 92 in the stationary central member are connecte to the sending connection paths 82 and the return connection paths 84 through circular grooves 94,96 formed in the inner wall of the vertical hole 88 of the rotational coupler body which are, respectively, fluidly connecte to the sending connection paths 82 and the return connection paths 84 and are positioned at the same levels as those of the lower ends of the sending path 90 and the return path 92 of the stationary central member 80 facing the inner wall of the vertical hole, whereby the sending path 90 and the return path 92 of the stationary central member are always fluidly connecte to the sending connection paths 82 and the return connection paths 84, respectively.

In this embodiment, a thrust bearing 98 is provided between the stationary central member 86 and the rotatable coupler body 80 which consists of a collar 104 integrally formed on the stationary central member 86 and an annular bearing member 106 fixedly connecte to the top surface of the rotatable coupler body 80 to surround the collar so that the rotatable

coupler body 80 can stably rotate about its axis relative to the stationary central member 86. Reference numerals 110 designate 0-rings for sealing the above-stated cooling fluid paths.

As stated above, in contrast to the conventional art, in the present invention, a cooling system is provided on a polisher turn table having a polishing surface free of a drive shaft of the turn, whereby it is possible to make the construction of the cooling system simple thereby simplifying maintenance, lowering costs and so. Accordingly, this invention also makes it possible to enhance cooling of a polishing member.

Although the present invention has been explained with reference to the drawings, the entire disclosure of Japanese Patent Application Hei9- 338033 filed on November 21,1997 including the specification, claims, drawings and summary is incorporated herein by reference to its entirety.