Patent Publication Number: US-8992288-B2

Title: Polishing pad auxiliary plate and polishing device equipped with polishing pad auxiliary plate

Description:
INCORPORATED BY REFERENCE 
     The disclosure of Japanese Patent Application No. 2011-165360 filed on Jul. 28, 2011 including the specification, drawings and abstract is incorporated herein by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to technology related to polishing of substrates, which are objects to be processed, requiring a high flatness processing precision such as for silicon wafers or semiconductor substrates, glass substrates or the like, and particularly relates to technology for which it is possible to realize reuse of polishing pads used when polishing the surface of these substrates. 
     2. Description of the Related Art 
     As is well known, when manufacturing semiconductors, a polishing process that flattens the surface of a substrate such as a silicon wafer, semiconductor substrate, glass substrate or the like, which are structural components, is performed. This polishing process is typically implemented by directly fixing a disk shaped polishing pad consisting of resin material or the like using double sided tape on a rotating surface plate of a polishing device, and while supplying polishing liquid containing abrasive grains, doing rotary motion of the polishing pad and the substrate relative to each other to perform polishing. 
     Then, as a polishing pad for implementing this kind of polishing process, as is noted in Published Unexamined Patent Application No. JP-A-2002-11630 and the like, a resin pad consisting of foaming or non-foaming urethane or the like is used. Also, in many cases, on the polishing surface of this polishing pad, a grooving process is implemented such as in concentric circle form, grid form, radial form or the like, or bubbles of the foaming resin are opened or the like. 
     In the polishing processing using a polishing pad, the polishing pad sometimes has to be torn off the rotating surface plate and changed to a different polishing pad, upon switching the kind of substrate which is the object to be polished or the like. Also, even in cases such as when reprocessing by surface grooving or the like using a different processing device for the purpose of reuse or the like of polishing pads which have degraded along with the polishing process, for example, it is necessary to tear off the polishing pad from the rotating surface plate. 
     However, thin disk shaped polishing pads are adhered strongly by adhesive tape to the rotating surface plate of the polishing device, so when tearing off this polishing pad from the rotating surface plate, damage such a bending or warping, wrinkles, breakage or the like occurs easily to the polishing pad. Accordingly, due to this kind of damage, there is the problem that this polishing pad, despite the fact that its product life has not ended, often must be discarded because it cannot be reused. 
     There is also the problem that the work of tearing off the polishing pad from the rotating surface plate while paying close attention not to cause damage is a great burden on the worker as it requires skill and caution. In addition, there was also the problem that because considerable time is required for the work of tearing the polishing pad off the rotating surface plate, the expensive and valuable polishing device has to be stopped for a long time, limiting the operating time of the device. 
     In light of this, with Published Unexamined Patent Application No. JP-A-2010-214579, the inventors previously proposed a polishing pad with auxiliary plate made so that an auxiliary plate is attached to the back surface of the polishing pad, and via this auxiliary plate, the polishing pad is adhered by double sided tape to the rotating surface plate of a polishing device. With this polishing pad with auxiliary plate, since the polishing pad is attached and detached in relation to the rotating surface plate while maintaining the state of the polishing pad being supported as is by the auxiliary plate, the auxiliary plate reinforces against damage of the polishing pad when attaching and detaching. This makes it possible to attach and detach the polishing pad in relation to the rotating surface plate with good workability while preventing damage to the polishing pad. 
     However, after a great deal of further research and study by the inventors, with the polishing pad with auxiliary plate proposed with JP-A-2010-214579, they found it hard to say that it is always easy to be compatible with all polishing devices. 
     Specifically, when overlapping the polishing pad on the rotating surface plate and adhering it, it is necessary to align the center of the polishing pad with the rotation center of the rotating surface plate, and particularly with polishing pads for which grooves or the like have been implemented on the polishing surface, precision is needed for aligning the centers. Also, when there is an increase in the number of attachments and detachments of the polishing pad to the rotating surface plate with use of an auxiliary plate as described above, the work of aligning the centers when attaching the polishing pad to the rotating surface plate becomes even more difficult, and there is a big problem in that the labor burden becomes high. 
     Also, with the polishing pad with auxiliary plate proposed in JP-A-2010-214579, in order to be attachable and detachable while aligning the center of the auxiliary plate to the rotating surface plate, there are cases when an adhering means such as an outer circumference ring or the like is provided on the outer circumference surface of the rotating surface plate, for example, between the auxiliary plate and the rotating surface plate. Meanwhile, within the polishing device, a protective cover or the like is mounted on the outer circumference side of the rotating surface plate, and there are some items for which of the rotating surface plate outer circumference side space is very narrow. Therefore, if an attempt is made to use that kind of outer circumference ring using a polishing device for which the outer circumference side space of the rotating surface plate happens to be narrow, there is the risk that it will be necessary to modify the polishing device or the like. 
     SUMMARY OF THE INVENTION 
     It is therefore one object of this invention to provide a polishing pad auxiliary plate of novel construction, which makes it possible to easily perform detaching and attaching of a polishing pad to a rotating surface plate while sufficiently ensuring the adhesive force of the polishing pad to the rotating surface plate, and particularly to be able to prevent damage to the polishing pad when tearing off the polishing pad from the rotating surface plate, and to be advantageous for realizing reuse of the polishing pad, for example. 
     An additional object of the present invention is to provide a polishing pad auxiliary plate of an improved constitution for which it is possible to easily and with good precision perform the work of aligning the centers when mounting the polishing pad on the rotating surface plate, lightening the labor burden, and also to be able to easily and advantageously apply this to rotating surface plates of conventional polishing devices of various specifications without having to do special modifications. 
     A further object of the present invention is to provide a polishing device equipped with a polishing pad auxiliary plate having this novel constitution. 
     First aspect of the present invention relates to a polishing pad auxiliary plate. A first mode of the first aspect of the present invention provides (A) A polishing pad auxiliary plate adapted to be mounted on a rotating surface plate of a polishing device for detachably attaching a polishing pad on the rotating surface plate, comprising: (B) a lower auxiliary plate adapted for overlapping a top surface of the rotating surface plate; (C) a first adhering member for adhering the lower auxiliary plate to the rotating surface plate; (D) an upper auxiliary plate equipped with a pad support surface on which the polishing pad is overlapped and adhered, and adapted for overlapping a top surface of the lower auxiliary plate; (E) a second adhering member for adhering the upper auxiliary plate to the lower auxiliary plate; and (F) an alignment member for mutually aligning the lower auxiliary plate and the upper auxiliary plate and matching center axes thereof, wherein by removing the upper auxiliary plate from the lower auxiliary plate adhered to the rotating surface plate by means of the first adhering member, the polishing pad is removable from the rotating surface plate in a state still adhered to the pad support surface of the upper auxiliary plate, and the removed upper auxiliary plate is re-adhereable and attachable in an aligned state to the lower auxiliary plate by means of the alignment member. 
     With the polishing pad auxiliary plate constituted according to the present invention, the polishing pad is mounted adhered to the rotating surface plate via the upper auxiliary plate and the lower auxiliary plate. This arrangement makes is possible to remove the upper auxiliary plate from the lower auxiliary plate with the lower auxiliary plate left adhered to the rotating surface plate, allowing to remove the polishing pad from the rotating surface plate with it left in a state adhered to the upper auxiliary plate. 
     Because of that, it is possible to remove the polishing pad from the rotating surface plate while preventing damage to the polishing pad with the polishing pad in a state reinforced and protected by the upper auxiliary plate, making handling of thin polishing pads easy. Then, for example upon repeating attachment and detachment of a polishing pad when changing the item subject to polishing, the polishing conditions or the like, or when removing a worn polishing pad and remounting it after regeneration processing or the like, it is also possible to easily perform the work of attaching and detaching the polishing pad on the rotating surface plate, the regenerating processing of the polishing pad, and the like. 
     Moreover, since the lower auxiliary plate which is left adhered to the rotating surface place and the upper auxiliary plate removed together with the polishing pad have their center axes matched by the alignment member, making it possible to more easily perform the work of attaching and detaching the polishing pad to the rotating surface plate, which requires alignment. In particular, this alignment member is provided between the lower auxiliary plate and the upper auxiliary plate, so it is not necessary to implement special processing or the like on the rotating surface plate. Also, this alignment member is able to avoid a large projection further to the outer circumference side than the rotating surface plate, and can be applied without having to implement a special modification of polishing devices for which a protective cover or the like is provided on the outer circumference side of the rotating surface plate, for example. 
     A second mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the first mode, wherein an adhesive force of the lower auxiliary plate and the upper auxiliary plate by the second adhering member is smaller than an adhesive force of the rotating surface plate and the lower auxiliary plate by the first adhering member. 
     With the second invention according to this mode, by mutually adjusting and setting the adhesive force of the first and second adhering members, the work of removing the upper auxiliary plate with the polishing pad left adhered from the lower auxiliary plate left adhered to the rotating surface plate becomes easier. In other words, it is possible to easily remove the polishing pad from the rotating surface plate in a state left adhered to the upper auxiliary plate while the lower auxiliary plate remains in a state adhered to the rotating surface plate, without requiring a special operation or the like to keep the lower auxiliary plate in an adhered state on the rotating surface plate. 
     A third mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the first or second mode, wherein the alignment member is provided at a position further to an inner circumference side than an outer circumference surface of the lower auxiliary plate and the upper auxiliary plate. 
     With the polishing pad auxiliary plate of this mode, projection of the alignment member to the outer circumference side of the upper and lower auxiliary plates is completely avoided. As a result, even for example when setting the outer diameter dimension of the upper and lower auxiliary plates to be the same or slightly smaller than the outer diameter dimension of the rotating surface plate for mounting, it is possible to secure a sufficiently large support surface of the polishing pad and to avoid projection of the alignment member to the outer circumference side from the rotating surface plate. Therefore, even if a protective cover or the like is installed on the outer circumference side of the rotating surface plate, it is possible to avoid this becoming a problem when applying the polishing pad auxiliary plate of the present invention. 
     A fourth mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the third mode, wherein the alignment member comprises at least one engaging convex part provided on one of the lower auxiliary plate and the upper auxiliary plate and projecting facing the other, and at least one engaging concave part provided on the other of the lower auxiliary plate and the upper auxiliary plate and engaging with the engaging convex part. 
     The polishing pad auxiliary plate of this mode makes it possible to easily obtain a large aligning force mechanically based on the mutual engagement action of the engaging convex part and the engaging concave part. Also, by adjusting the shape, size, number of or the like of the engaging convex part and the engaging concave part, it is also possible to set the alignment action direction and acting force easily with a large degree of freedom. 
     A fifth mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the fourth mode, wherein the engaging convex part and the engaging concave part are formed with engagement portions positioned at an outer circumference part of the lower auxiliary plate and the upper auxiliary plate. 
     In the polishing pad auxiliary plate of this mode, the concave and convex parts fit to each other, i.e., the engaging outer circumference surface of the engaging convex part and the engaging inner circumference surface of the engaging concave part are formed and positioned at the outer circumference part separated from the center of the polishing pad auxiliary plate. This makes it possible to improve the relative alignment precision of the upper and lower auxiliary plates, particularly the radial direction alignment precision. Note that as shown with the sixth and seventh modes described later as well, it is possible to have a mode for which the engaging outer circumference surface of the engaging convex part and the engaging inner circumference surface of the engaging concave part extend in the circumference direction along the outer circumference edge part of the polishing pad auxiliary plate around the center of the polishing pad auxiliary plate, and also possible to have a mode for which they are partially positioned on the circumference such as with the engaging convex part and the engaging concave part formed on the outer circumference part of the polishing pad auxiliary plate. 
     A sixth mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the fifth mode, wherein the engagement portions of the engaging convex part and the engaging concave part are constituted by a ring shaped engaging outer circumference surface and engaging inner circumference surface which are fit to each other extending continuously in a circumference direction of the lower auxiliary plate and the upper auxiliary plate. 
     In the polishing pad auxiliary plate of this mode, more preferably, the engaging concave part and the engaging convex part are formed having ring shaped engaging inner and outer circumference surfaces which broaden around the center axis of the polishing pad auxiliary plate. With this arrangement, it is no longer necessary to mutually align in the circumference direction when mounting the upper auxiliary plate on the lower auxiliary plate, so work can be done easily and quickly. 
     A seventh mode of the first aspect of the present invention provides the polishing pad auxiliary plate of the fifth mode, wherein the at least one engaging convex part comprises a plurality of engaging convex parts, and the at least one engaging concave part comprises a plurality of engaging concave parts, and wherein at a plurality of locations on a circumference at the outer circumference part of the lower auxiliary plate and the upper auxiliary plate, formed at mutually corresponding positions are the plurality of engaging concave parts at one of mutually overlapping surfaces of the lower auxiliary plate and the upper auxiliary plate which open facing an other, and the plurality of engaging convex parts at the other of the mutually overlapping surfaces of the lower auxiliary plate and the upper auxiliary plate which project facing the one, and the engagement portions are constituted by fitting the engaging convex parts into the engaging concave parts. 
     With the polishing pad auxiliary plate of this mode, it becomes possible to easily realize mutual alignment of the upper and lower auxiliary plates even in the circumference direction around the center axis, not just in the direction perpendicular to the center axis. 
     An eighth mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the fifth mode, wherein the at least one engaging convex part comprises a plurality of engaging convex parts, and the at least one engaging concave part comprises a plurality of engaging concave parts, wherein the plurality of engaging convex parts are formed by an elastic material and located at a plurality of locations on a circumference at the outer circumference part of one of the lower auxiliary plate and the upper auxiliary plate so as to project toward an other, and wherein tips of the engaging convex parts are engaged in relation to the plurality of engaging concave parts provided opening at the outer circumference surface of the other of the lower auxiliary plate and the upper auxiliary plate, so as to provide the engagement portions. 
     With the polishing pad auxiliary plate of this mode, it is possible to form with the engagement portions exposed on the outer circumference surface of the upper and lower auxiliary plates. This arrangement makes it possible to easily confirm the engagement status of the engagement portions by visual observation or the like. Also, this mode makes it possible to stably maintain the engaged state at the engagement portions using the elasticity of the engaging convex part. 
     A ninth mode of the first aspect of the present invention provides the polishing pad auxiliary plate of the fourth mode, wherein the engaging convex part and the engaging concave part are provided on a center axis of the lower auxiliary plate and the upper auxiliary plate. 
     With the polishing pad auxiliary plate of this mode, by providing the engaging convex part and the engaging concave part on the center axis of the upper and lower auxiliary plates, it is possible to perform center axis matching of the upper and lower auxiliary plates using one engagement portion. Also, when mutually aligning the engaging convex part and the engaging concave part provided on the center axis, it is possible to easily have an engaged state of these engaging convex part and engaging concave part without requiring mutual alignment in the circumference direction of the upper and lower auxiliary plates. 
     A tenth mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to the ninth mode, wherein thread grooves that screw together are formed at an outer circumference surface of the engaging convex part and an inner circumference surface of the engaging concave part, and the second adhering member is constituted by the engaging concave part and the engaging convex part that constitute the alignment member being screwed together. 
     The polishing pad auxiliary plate of this mode makes it possible to obtain adhesive force of the upper auxiliary plate and the lower auxiliary plate using the alignment member. With this arrangement, it is possible to constitute the second adhering member only using this alignment member, and to do auxiliary constitution of the adhesion force between the upper and lower auxiliary plates by the second adhering member with the alignment member. 
     An eleventh mode of the first aspect of the present invention provides the polishing pad auxiliary plate according to any one of the fourth, fifth, sixth, seventh, ninth or tenth modes, wherein the engaging convex part provided at one of the lower auxiliary plate and the upper auxiliary plate is formed with the same material as the one of the lower auxiliary plate and the upper auxiliary plate. 
     The polishing pad auxiliary plate of this mode makes it possible to prevent there being a big local difference in the support characteristics of the polishing pad with the auxiliary plates overlapping above and below with the engaging convex part forming part. Because of that, upon pressing force acts on the polishing pad surface when doing pad polishing processing, at the engaging convex part and the engaging concave part forming site for the upper and lower auxiliary plates which support this polishing pad, it is possible to reduce or avoid problems such as with polishing precision or the like due to a local difference in characteristics such as of the pressing reaction force, the polishing pad elasticity, or the like. 
     Second aspect of the present invention relates to a polishing device. A first mode of the second aspect of the present invention provides a polishing device, wherein the device is equipped with a polishing pad auxiliary plate according to any one of the first through eleventh modes of the first aspect of the present invention, and wherein the polishing pad auxiliary plate is mounted on the top surface of the rotating surface plate, and a protective member is provided arranged across a gap at an outer circumference side of the rotating surface plate, while the alignment member is provided positioned further to an inner circumference side than outer circumference end surfaces of the rotating surface plate and the polishing pad auxiliary plate. 
     The use of the polishing device according to the second aspect of the present invention while using the polishing pad auxiliary plate according to the first aspect of the present invention makes it possible to easily remove and mount the polishing pad from and on the rotating surface plate while preventing damage to the polishing pad, and to perform alignment of the polishing pad to the rotating surface plate during mounting easily and with good precision. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The foregoing and/or other objects features and advantages of the invention will become more apparent from the following description of a preferred embodiment with reference to the accompanying drawings in which like reference numerals designate like elements and wherein: 
         FIG. 1  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a first embodiment of the present invention is mounted; 
         FIG. 2  is a vertical cross section explanatory view showing the state of the polishing pad removed with the polishing device shown in  FIG. 1 ; 
         FIG. 3  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a second embodiment of the present invention is mounted; 
         FIG. 4  is a vertical cross section explanatory view showing the state of the polishing pad removed with the polishing device shown in  FIG. 3 . 
         FIG. 5  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a third embodiment of the present invention is mounted; 
         FIG. 6  is a vertical cross section explanatory view showing the state of the polishing pad removed with the polishing device shown in  FIG. 5 . 
         FIG. 7  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a fourth embodiment of the present invention is mounted; 
         FIG. 8  is a vertical cross section explanatory view showing the state of the polishing pad removed with the polishing device shown in  FIG. 7 . 
         FIG. 9  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a fifth embodiment of the present invention is mounted; 
         FIG. 10  is a side view of the lower auxiliary plate constituting the polishing pad auxiliary plate shown in  FIG. 9 ; 
         FIG. 11  is a plan view of the lower auxiliary plate shown in  FIG. 10 . 
         FIG. 12  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a sixth embodiment of the present invention is mounted; 
         FIG. 13  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to a seventh embodiment of the present invention is mounted; 
         FIG. 14  is a vertical cross section view showing the key parts of a polishing device on which a polishing pad auxiliary plate according to an eighth embodiment of the present invention is mounted; 
         FIG. 15  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate removed as a ninth embodiment of the present invention; 
         FIG. 16  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate removed as a tenth embodiment of the present invention; 
         FIG. 17  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate removed as an eleventh embodiment of the present invention; 
         FIG. 18  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate removed as a twelfth embodiment of the present invention; 
         FIG. 19  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate removed as a thirteenth embodiment of the present invention; 
         FIG. 20  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate aligned as a fourteenth embodiment of the present invention; 
         FIG. 21  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate aligned as a fifteenth embodiment of the present invention; and 
         FIG. 22  is a vertical cross section explanatory view showing the state of the polishing pad auxiliary plate removed as a sixteenth embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     First,  FIGS. 1 and 2  show a polishing pad auxiliary plate  10  according to a first embodiment of the present invention. This polishing pad auxiliary plate  10  is used mounted on the rotating surface plate  14  of the polishing device  12 , and is made so that the polishing pad  16  can be detachably attached to the rotating surface plate  14 . 
     The polishing device is an item used as a CMP device as noted in Published Unexamined Patent Application No. JP-A-2010-141155 or the like, for example, and though the basic structure is well known, to describe the key parts, first, a rotation axis extending in the vertical direction is supported to be able to rotate by a device main unit installed in a fixed manner on a foundation base, and a disk shaped rotating surface plate  14  is provided in a fixed manner on the top end part of this rotation axis. This rotating surface plate  14  has a flat top surface  18  that broadens in the horizontal direction, and this top surface  18  is the support surface of the polishing pad  16 . Also, a rotation output axis of an electric motor is linked to the rotation axis, and by the drive force of the electric motor being transmitted, the rotation axis and thus the rotating surface plate  14  are made to be rotationally driven around a center axis. Note that above the top surface  18  that supports the polishing pad  16 , a nozzle for supplying polishing slurry is arranged, and also, a polishing head is arranged for implementing polishing processing by pressing on the polishing pad  16  while holding and rotating a wafer or the like which is the polishing subject (object to be polished). 
     With this kind of polishing device, the polishing pad auxiliary plate  10  mounted on the rotating surface plate  14  includes a lower auxiliary plate  20  and an upper auxiliary plate  22 . Then, the lower auxiliary plate  20  is adhered to the top surface  18  of the rotating surface plate  14  using the first adhering member  24 , and furthermore, the upper auxiliary plate  22  is adhered to the top surface of the lower auxiliary plate  20  using the second adhering member  26 . Specifically, by adhering the lower auxiliary plate  20  and the upper auxiliary plate  22  overlapped with each other via the second adhering member  26 , the polishing pad auxiliary plate  10  is constituted overall as a two layer structure, and this is attached to the top surface  18  of the rotating surface plate  14  using the first adhering member  24 . 
     The lower auxiliary plate  20  and the upper auxiliary plate  22  both have a thin, roughly round flat plate shape, and have a flat front surface (top surface) and back surface (bottom surface). These upper and lower auxiliary plates  22  and  20  are preferably items of a material that is harder than the mounted polishing pad  16 , and have a member rigidity greater than that of the polishing pad  16 . Though it depends on the use method, as described hereafter, while use of the lower auxiliary plate  20  without repeating attachment and detachment after attachment to the rotating surface plate  14  is possible, since it is expected that there will be repeated attachment and detachment after the upper auxiliary plate  22  is attached to the rotating surface plate  14 , it is preferable that at least for the upper auxiliary plate  22 , an item is used that has a greater member rigidity than that of the polishing pad  16 . 
     The upper auxiliary plate  22  supports the polishing pad  16 , and it can be an item that satisfies the strength, rigidity, shape stability, and precision required when doing various types of processing such as dressing, cleaning, re-grooving or the like on the polishing pad surface, in addition to the polishing processing using the polishing device  12 . Thus, there is no restriction on the material or thickness dimension of the upper auxiliary plate  22 . In particular, not only the lower auxiliary plate  20 , but also the upper auxiliary plate  22 , does not bear the support strength, rigidity and the like of the polishing pad  16  as a stand alone item. But rather when doing polishing processing for example, the bottom surface of the upper auxiliary plate  22  is supported by the rotating surface plate  14 , with being overlapped on the rotating surface plate  14  of the polishing device  12 . Thus, the upper auxiliary plate  22  does not need to be much strength or rigidity as a stand alone item. Accordingly, in addition to metals such as stainless steel or the like, synthetic resin or fiber reinforced resin or the like can also be used as the forming material of the lower auxiliary plate  20  or the upper auxiliary plate  22 . In particular, synthetic resin has easier processing and handling and is lighter than metal materials, and for example polycarbonate and the like has the advantage of being excellent in terms of stability of the thickness dimension precision and low distortion characteristics in relation to changes in temperature. 
     Also, in order to obtain a stable support force across the entire polishing pad  16 , it is preferable to set the outer diameter dimension of the upper auxiliary plate  22  to a value greater than the outer diameter dimension of the polishing pad  16 , it is preferable to set the outer diameter dimension of the lower auxiliary plate  20  to a value greater than the outer diameter dimension of the upper auxiliary plate  22 , and also, it is preferable to set the outer diameter dimension of the lower auxiliary plate  20  to a value lower than the outer diameter dimension of the rotating surface plate  14 . In particular, as shown in  FIGS. 1 and 2 , by making the outer diameter dimensions of the lower auxiliary plate  20  and the upper auxiliary plate  22  roughly the same, and also by making the outer diameter dimension of the mounted rotating surface plate  14  roughly the same, it is possible to ensure a sufficiently large support surface for the polishing pad  16 . This arrangement makes it possible to mount a polishing pad  16  of roughly the same size as the rotating surface plate  14  on the rotating surface plate  14  having roughly the same support force across the entirety. 
     Furthermore, as the first adhering member  24  and the second adhering member  26 , as long as it is an item that is able to hold the lower auxiliary plate  20  and the upper auxiliary plate  22  in an adhered state on the top surface  18  of the rotating surface plate  14  in resistance to the external force applied when polishing, there are no particular restrictions. In specific terms, a bonding agent or adhesive agent, or double sided tape to which a bonding agent or adhesive agent is attached or the like to both sides of a base material sheet or the like can be used as the first and second adhering members  24  and  26 , but in addition, it is also possible to use negative pressure suction using negative pressure air or the like, or magnetic suction using a permanent magnet or electromagnet or the like. Also, an adhering means consisting of these bonding agents or the like preferably applies a roughly even adhesive force across roughly the entire surface of the flat overlapping surface of the lower auxiliary plate  20  and the upper auxiliary plate  22 . This arrangement makes it possible to obtain a large adhesive force, and also to avoid problems such as locally differing support characteristics of the polishing pad  16  on the surface of the polishing pad auxiliary plate  10 . 
     For example, with negative pressure suction or an electromagnet, the adhesive force can be turned on and off, but when applying a fixed adhesive force such as with a bonding agent or the like, it is preferable to set the adhesive force of the upper auxiliary plate  22  on the lower auxiliary plate  20  by the second adhering member  26  lower than the adhesive force of the lower auxiliary plate  20  on the rotating surface plate  14  by the first adhering member  24 . With this arrangement, when tearing off and removing the upper auxiliary plate  22  from the lower auxiliary plate  20 , it is possible to easily realize leaving the lower auxiliary plate  20  left adhered on the rotating surface plate  14 . For specific realization of this kind of difference in adhesive force, in addition to making the adhering means such as the material of the bonding agent or adhesive agent or the like mutually different, it is also possible to realize this by making the adhesion area or the adhesion surface state (whether or not there is processing such as surface roughness, plasma or the like) mutually different. 
     Yet further, the surface (top surface) of the upper auxiliary plate  22  is the polishing pad support surface, and the polishing pad  16  is attached overlapping this. For this polishing pad  16 , it is possible to use various types of polishing pads that are well known from the past. Also, the back surface of this polishing pad  16  is adhered to the surface of the upper auxiliary plate  22  using conventionally known adhesive tape, a suitable bonding agent, or the like for sticking on the polishing pad. 
     Note that it is preferable to set the adhering means of the polishing pad  16  to the upper auxiliary plate  22  to a greater adhesive force than that of the previously described second adhering member  26 . With this arrangement, when removing the upper auxiliary plate  22  from the lower auxiliary plate  20  in a state with the polishing pad  16  left adhered, it is possible to effectively prevent unexpected peeling of the polishing pad  16  from the upper auxiliary plate  22  even when the upper auxiliary plate  22  is curved or the like. 
     Also, the outer diameter dimension of the polishing pad  16  is typically a standard value, but in many cases, it is set to be the same or smaller than the outer diameter dimension of the top surface  18  of the mounted rotating surface plate  14 . 
     Furthermore, it is also possible to provide a suitable cushion layer at least for one of, for example, between the top surface  18  of the rotating surface plate  14  and the lower auxiliary plate  20 , between the lower auxiliary plate  20  and the upper auxiliary plate  22 , and between the upper auxiliary plate  22  and the polishing pad  16 . By providing this kind of cushion layer, it is possible to make the polishing efficiency or the like on the object to be processed uniform across the entire surface when doing polishing processing using the polishing pad  16 . 
     As this cushion layer, it is possible to suitably use for example a resin sheet given a certain degree of compressibility using foaming or the like, elastomer sheets, rubber sheets, or the like. It is also possible to constitute the cushion layer using the first adhering member  24 , the second adhering member  26 , or the adhering means of the polishing pad  16  on the upper auxiliary plate  22 . Note that the cushion layer is preferably formed so as to exist at a fixed thickness with a size across roughly the entirety of the support area of the polishing pad  16  to prevent local distortion of the support surface of the polishing pad  16 . 
     Also, an alignment member  28  for mutually aligning and matching the center axes is provided between the lower auxiliary plate  20  and the upper auxiliary plate  22  constituting the polishing pad auxiliary plate  10 . With this embodiment, a circular stepped surface  30  is formed extending across the entire circumference around the center axis of the lower auxiliary plate  20  at the outer circumference part of the lower auxiliary plate  20 . Then, the thickness dimension of the lower auxiliary plate  20  is made smaller at the outer circumference side of this stepped surface  30 . Thus, a ring shaped engaging concave part  32  continuously extending to the entire circumference of the circumference direction having a notched cross section shape open at the outer circumference surface of the lower auxiliary plate  20  is integrally formed at the lower auxiliary plate  20 . 
     Meanwhile, with this embodiment, a circular stepped surface  34  extending across the entire circumference around the center axis of the upper auxiliary plate  22  is formed on the outer circumference part of the upper auxiliary plate  22 . Then, the thickness dimension of the upper auxiliary plate  22  is made greater at the outer circumference side of this stepped surface  34 . Thus, a ring shaped engaging convex part  36  continuously extending to the entire circumference of the circumference direction along the outer circumference edge of the upper auxiliary plate  22  is integrally formed at the upper auxiliary plate  22 . Note that the engaging convex part  36  and the engaging concave part  32  can also be formed on either of the upper or lower auxiliary plates  22  or  20 . 
     The previously described lower auxiliary plate  20  stepped surface  30  and the engaging concave part  32  are mutually aligned in relation to the upper auxiliary plate  22  stepped surface  34  and the engaging convex part  36 , and with this embodiment, constitute the engaging outer circumference surface and the engaging inner circumference surface. Then, when the upper auxiliary plate  22  is overlapped on the lower auxiliary plate  20 , the engaging convex part  36  is fit into the engaging concave part  32 , the stepped surface  34  is overlapped on the stepped surface  30  in the radial direction, and the engagement portions are formed. Accordingly, the alignment member  28  is constituted by the engaging concave part  32  and the engaging convex part  36 , and in a state with the center axes matched to each other and aligned in the radial direction, the upper auxiliary plate  22  is overlapped on the lower auxiliary plate  20 . Note that the alignment member  28  is provided positioned further to the inner circumference side than the outer circumference surface of the upper and lower auxiliary plates  22  and  20 , and by doing that, the upper and lower auxiliary plates  22  and  20  and thus the polishing device  12  do not become large. 
     With a polishing device  12  equipped with a polishing pad auxiliary plate  10  constituted in this way, as shown in  FIG. 1 , the polishing pad auxiliary plate  10  constituted from the upper and lower auxiliary plates  22  and  20  is adhered and mounted on the top surface  18  of the rotating surface plate  14 , and also, in a state with the polishing pad  16  adhered and supported on the top surface of the upper auxiliary plate  22 , the rotating surface plate  14  is rotationally driven and CMP (chemical mechanical polishing) is implemented on the object to be processed such as a substrate or the like. Then, this polishing device  12  is able to exhibit special technical effects as described below by being equipped with a specially structured polishing pad auxiliary plate  10 . 
     First, as shown in  FIG. 2 , the upper auxiliary plate  22  is removed from the lower auxiliary plate  20  adhered to the rotating surface plate  14  by means of the first adhering member  24 , with the polishing pad  16  left adhered to the top surface of the upper auxiliary plate  22 . This makes it possible to remove the polishing pad  16  from the rotating surface plate  14 . Then, even when doing cleaning or re-processing or the like of the surface (polishing surface) of the polishing pad  16  removed from the rotating surface plate  14 , it is possible to perform that with the polishing pad  16  left adhered to the top surface of the upper auxiliary plate  22 . With this arrangement, of course when detaching and attaching the polishing pad  16  in relation to the rotating surface plate  14  or when doing cleaning or re-processing or the like of the polishing pad  16 , but also when transporting or storing the polishing pad  16  or the like, it is possible to prevent bending or damage to the polishing pad  16  using the reinforcing action of the upper auxiliary plate  22 , and to keep the polishing pad  16  in good condition. 
     Also, when the polishing pad  16  is removed from the rotating surface plate  14  together with the upper auxiliary plate  22 , the lower auxiliary plate  20  is left on the top surface  18  of the rotating surface plate  14 . Then, when the polishing pad  16  is again mounted on the rotating surface plate  14 , the alignment member  28  provided between the upper auxiliary plate  22  and the lower auxiliary plate  20  makes it possible to easily match the center axes with good precision for the upper auxiliary plate  22 , and thus the polishing pad  16  in relation to the lower auxiliary plate  20 , and thus the rotating surface plate  14 . 
     Here, the engaging concave part  32  and the engaging convex part  36  constituting this alignment member  28  are in a state fitted to each other so they overlap with almost no gap, so it is possible to prevent an adverse effect on the support characteristics of the polishing pad  16 . Also, of the outer circumference part of the upper and lower auxiliary plates  22  and  20 , particularly with this embodiment, the engagement portions, said another way the alignment member  28 , is formed at the outer circumference edge part, and since the radial direction center part which is the area mainly used for polishing is off the mark with the polishing pad  16 , even when there is a slight gap at the fitting part of the engaging concave part  32  and the engaging convex part  36 , it is possible to avoid an adverse effect to the support characteristics of the polishing pad  16  to the degree of large problems occurring with the polishing characteristics. 
     Moreover, the engaging concave part  32  and the engaging convex part  36  constituting the alignment member  28  are formed further to the inner circumference side than the overlapping surface of the upper and lower auxiliary plates  22  and  20 , said another way, the outer circumference end surface of the rotating surface plate  14  and the polishing pad auxiliary plate  10 , and it is possible to avoid projection to the outer circumference surface of the upper and lower auxiliary plates  22  and  20 . Thus, for example as shown in  FIGS. 1 and 2 , even when a protective member  38  is installed near the outer circumference side of the rotating surface plate  14  with the polishing device  12 , it is possible to realize a polishing device  12  equipped with upper and lower auxiliary plates  22  and  20  equipped with alignment member  28  while avoiding interference with that kind of protective member  38 . 
     Moreover, as described above, as a result of being able to attach and detach the polishing pad  16  to the rotating surface plate  14  quickly with accurate aligning precision while preventing damage to the polishing pad  16 , there is no longer unnecessary restriction of the operating time of the expensive polishing equipment to do the work of attaching and detaching the polishing pad  16  and the like, and it is possible to achieve an improvement in the operating efficiency of the polishing equipment and thus in the production efficiency (polishing work efficiency) of a substrate or the like. 
     Also, since attachment and detachment of the polishing pad  16  on the rotating surface plate  14  is easily realized, it is possible to realize reuse of the polishing pad  16  at a practical level even without special skill or knowledge. Specifically, it has become possible to study at a practical utilization level, for example, reuse of a polishing pad  16  removed once from the rotating surface plate  14  when switching product types or the like of the object to be polished such as a substrate or the like, or reuse after re-processing of a polishing pad  16  removed once from the rotating surface plate  14  to do re-processing such as surface grooving or the like using a different processing device as a degradation countermeasure. 
     We described above a first embodiment of the present invention, but the specific constitution of the present invention should not be interpreted as being limited by this first embodiment. Following are shown by example a plurality of other embodiments of the present invention equipped with alignment member of a separate constitution between the upper and lower auxiliary plates  22  and  20 , but these embodiments also do not indicate limitation of the constitution of the present invention. Note that with the following embodiments, for the members and sites that have the same constitution as the first embodiment, a detailed description of these is omitted by respectively noting the same code numbers as those of the first embodiment for the corresponding sites in each drawing. 
       FIGS. 3 and 4  show a polishing device  42  equipped with a polishing pad auxiliary plate  40  as a second embodiment of the present invention. 
     With this polishing pad auxiliary plate  40 , the engaging concave part  44  is formed by circular ring shaped grooves extending continuously in the circumference direction on the outer circumference part of the top surface of the lower auxiliary plate  20 . Meanwhile, on the outer circumference part of the bottom surface of the upper auxiliary plate  22  is formed the engaging convex part  46  by circular ring shaped projections extending continuously in the circumference direction. This engaging convex part  46  can be integrally formed with the upper auxiliary plate  22 , but as shown in the drawing, can also be formed as a separate item. Specifically, with this embodiment, circular ring shaped circumference groove  48  is formed extending in the circumference direction open to the bottom surface of the upper auxiliary plate  22 , and on this circumference groove  48 , the engaging convex part  46  is formed by a circular ring shaped block formed as a separate unit being fit into and adhered to one side of the axis direction. 
     The lower auxiliary plate  20  engaging concave part  44  and the upper auxiliary plate  22  engaging convex part  46  are both formed at corresponding radial direction positions around the center axis, and when the upper and lower auxiliary plates  22  and  20  are overlapped, by the engaging convex part  46  being fit into the engaging concave part  44 , the upper and lower auxiliary plates  22  and  20  are mutually aligned in the radial direction. Note that with this embodiment, two sets of engaging inner circumference surfaces and engaging outer circumference surfaces are constituted by the corresponding radial direction overlapping surfaces of both side wall surfaces of the lower auxiliary plate  20  engaging concave part  44  and the inner and outer circumference surfaces of the upper auxiliary plate engaging convex part  46 . 
       FIGS. 5 and 6  show a polishing device  52  equipped with a polishing pad auxiliary plate  50  shown as a third embodiment of the present invention. 
     With this polishing pad auxiliary plate  50 , a stepped surface  54  is formed as the circular engaging inner circumference surface extending across the entire circumference around the center axis on the outer circumference part of the lower auxiliary plate  20 . Then, the thickness dimension of the lower auxiliary plate  20  is made greater at the outer circumference side of this stepped surface  54 . Thus, the ring shaped engaging convex part  56  extending continuously at the entire circumference of the circumference direction along the outer circumference edge of the lower auxiliary plate  20  is integrally formed with the lower auxiliary plate  20 . 
     Meanwhile, at the outer circumference part of the upper auxiliary plate  22 , a stepped surface  58  is formed as the circular engaging outer circumference surface extending across the entire circumference around the center axis. Then, the thickness dimension of the upper auxiliary plate  22  is made smaller at the outer circumference side of this stepped surface  58 . Thus, a ring shaped engaging concave part  60  extending continuously at the entire circumference in the circumference direction, having a notched cross section shaped opening to the outer circumference surface of the upper auxiliary plate  22 , is integrally formed with the upper auxiliary plate  22 . 
     Furthermore, while a female screw is formed on the stepped surface  54  of the lower auxiliary plate  20 , a male screw is formed on the stepped surface  58  of the upper auxiliary plate  22 . Then, the male screw of the stepped surface  58  of the upper auxiliary plate  22  is screwed together with the female screw of the stepped surface  54  of the lower auxiliary plate  20 , and by overlapping in the radial direction the lower auxiliary plate  20  stepped surface  54  and the upper auxiliary plate  22  stepped surface  58 , the upper auxiliary plate  22  is overlapped on the top surface of the lower auxiliary plate  20 . Also, in this state of being overlapped, with the screwed constitution of the stepped surfaces  58  and  54  of the upper and lower auxiliary plates  22  and  20 , a second adhering member  62  is constituted for which adhering is done with the ability to remove the upper and lower auxiliary plates  22  and  20 . 
     Note that the female and male screws of this kind of screwed constitution preferably has the screw direction set so that the screws do not loosen when considering the rotation reaction force during polishing which is applied to the rotating surface plate  14  of the polishing device  12 . 
       FIGS. 7 and 8  show a polishing device  66  equipped with a polishing pad auxiliary plate  64  as a fourth embodiment of the present invention. 
     With this polishing pad auxiliary plate  64 , a column shaped engaging convex part  68  projecting facing upward is formed at the center part of the top surface of the lower auxiliary plate  20 . This engaging convex part  68  can be integrally formed with the lower auxiliary plate  20 , but as shown in the drawing, it can also be formed as a separate unit. Specifically, with this embodiment, a circular fitting recess  70  is formed on the center axis of the lower auxiliary plate  20 , and by a column shaped block formed as a separate unit being fit into this fitting recess  70  at one side of the axis direction and adhered, the engaging convex part  68  is formed. Meanwhile, at the center part of the bottom surface of the upper auxiliary plate  22 , a circular engaging concave part  72  with a bottom that opens to the bottom surface is formed on the center axis. Note that the engaging convex part  68  and the engaging concave part  72  can also be formed on either of the upper or lower auxiliary plates  22  or  20 . 
     Then, by fitting the engaging convex part  68  into the engaging concave part  72  when the upper and lower auxiliary plates  22  and  20  are overlapped, the upper and lower auxiliary plates  22  and  20  are aligned with each other in the radial direction. Note that with this embodiment, the engaging outer circumference surface and the engaging inner circumference surface are constituted by the outer circumference surface of the engaging convex part  68  of the lower auxiliary plate  20  and the inner circumference surface of the engaging concave part  72  of the upper auxiliary plate  22 . 
       FIG. 9  shows a polishing device  76  equipped with a polishing pad auxiliary plate  74  as a fifth embodiment of the present invention. 
     With this polishing pad auxiliary plate  74 , a column shaped engaging convex part  78  is formed projecting facing upward at the outer circumference part of the top surface of the lower auxiliary plate  20 . This engaging convex part  78  can be integrally formed with the lower auxiliary plate  20 , and as with the engaging convex parts of the fourth embodiment, can also have a fitting recess formed on the lower auxiliary plate  20  and be adhered by press fitting or the like of a separate unit pin or the like. Also, as shown in  FIGS. 10 and 11 , a plurality of these engaging convex parts  78  are formed independently from each other with a specified distance separated in the circumference direction at the outer circumference part of the lower auxiliary plate  20 . It is particularly preferable that those plurality of engaging convex parts  78  are formed positioned on the same circle on the center axis at equal intervals in the circumference direction. 
     Meanwhile, at the outer circumference part of the bottom surface of the upper auxiliary plate  22 , a circular engaging concave part  80  with a bottom is formed opening facing downward respectively at each corresponding position in relation to formation positions of the plurality of engaging convex parts  78  on the lower auxiliary plate  20 . Note that the engaging convex part  78  and the engaging concave part  80  can be formed at either of the upper or lower auxiliary plates  22  or  20 . 
     Then, when the upper and lower auxiliary plates  22  and  20  are overlapped, by the engaging convex parts  78  respectively being fit into the engaging concave parts  80 , the upper and lower auxiliary plates  22  and  20  are aligned to each other in the radial direction. Note that with this embodiment, the engaging outer circumference surface and the engaging inner circumference surface positioned at the outer circumference part of the lower auxiliary plate  20  and the upper auxiliary plate  22  are constituted by the outer circumference surface of the engaging convex part  78  of the lower auxiliary plate  20  and the inner circumference surface of the engaging concave part  80  of the upper auxiliary plate  22 . 
     In particular, as with this embodiment, by using an alignment member consisting of a plurality of independent engaging convex parts  78  and engaging concave parts  80  in the circumference direction, the overlapped upper and lower auxiliary plates  22  and  20  can be aligned to each other not just in the radial direction but also in the circumference direction. 
     Note that instead of the plurality of independent engaging concave parts  80  formed on the upper auxiliary plate  22 , it is also possible to use a circumference groove extending in a circle continuously in the circumference direction around the center axis of the upper auxiliary plate  22 , or as shown in a sixth embodiment of the present invention in  FIG. 12 , to form a circular stepped surface  82  extending across the entire circumference around the center axis on the outer circumference part of the upper auxiliary plate  22 , and by making the thickness dimension smaller at the outer circumference side of this stepped surface  82 , to form a ring shaped engaging concave part  83  extending continuously at the entire circumference in the circumference direction with a notched cross section shape open at the outer circumference surface of the upper auxiliary plate  22 . 
     In this way, with the upper auxiliary plate  22 , by forming the engaging surface of the engaging convex part  78  of the lower auxiliary plate  20  continuously across the entire circumference, when the upper and lower auxiliary plates  20  and  22  are overlapped, it is possible to easily perform the mounting work without needing to align the upper and lower auxiliary plates  20  and  22  to each other in the circumference direction. 
       FIG. 13  shows a polishing pad auxiliary plate  84  as a seventh embodiment of the present invention. 
     With this polishing pad auxiliary plate  84 , a small diameter part is provided respectively on the upper part of the outer circumference surface of the lower auxiliary plate  20  and the lower part of the outer circumference surface of the upper auxiliary plate  22 . Then, by these upper and lower auxiliary plates  22  and  20  being overlapped, by their respective small diameter parts, a circular ring shaped holding recess  86  is formed extending across the entire circumference in the circumference direction widening at a specified width straddled across the upper and lower auxiliary plates  22  and  20 . 
     Also, a groove shaped engaging concave part  88  is formed at the small diameter part lower edge of the lower auxiliary plate  20 . This engaging concave part  88  is opened to the outer circumference surface of the lower auxiliary plate  20  at the bottom surface of the holding recess  86 . Here, the bottom surface of the holding recess  86  indicates, of the surfaces constituting the holding recess  86 , the ring shaped surface that widens in the vertical direction of  FIG. 13  straddling the upper and lower auxiliary plates  22  and  20 . Meanwhile, at the small diameter part of the upper auxiliary plate  22  constituting the holding recess  86 , the plate shaped engaging convex part  90  consisting of elastic material is fixed and attached by a fixing pin  92  at the base end part. This engaging convex part  90  is held and arranged in the holding recess  86  formed at the outer circumference surface of the upper and lower auxiliary plates  22  and  20 , and extends out above the outer circumference surface of the lower auxiliary plate  20  from the upper auxiliary plate  22 . Then, an engaging hook part  94  of the tip part of the engaging convex part  90  is latched to the engaging concave part  88  formed on the small diameter part of the lower auxiliary plate  20 , and is held in a latched state based on the elasticity of the engaging convex part  90 . 
     Furthermore, a plurality of this kind of engaging convex part  90  are provided separated by a specified distance in the circumference direction on the outer circumference surface of the upper and lower auxiliary plates  22  and  20 . Then, each engaging convex part  90  attached to the outer circumference surface of the upper auxiliary plate  22  constitutes an alignment member that mutually aligns the upper and lower auxiliary plates  22  and  20  on the center axes by elastically pressing on the outer circumference surface of the lower auxiliary plate  20 . Also, by latching the engaging hook part  94  of the engaging convex part  90  to the engaging concave part  88 , an adhering means is also constituted which applies adhesive force while holding the upper and lower auxiliary plates  22  and  20  in an overlapped state. 
     Note that instead of the engaging convex part  90  equipped with an engaging hook part  94  for engaging with the engaging concave part  88  as described above, as with the eighth embodiment of the present invention shown in  FIG. 14 , for example, it is also possible to use a linking plate  100  overlapping the bottom surface of the holding recess  86  extending straddled across the upper and lower auxiliary plates  22  and  20 , and adhere both end parts of this linking plate  100  to one outer circumference surface of each of the upper and lower auxiliary plates  22  and  20  using linking pins  102  and  102 . Note that by making it possible for at least one of the linking pins  102 ,  102  to be detachable in relation to the lower auxiliary plate  20  or the upper auxiliary plate  22 , it is possible to release the linking by the linking plates  100  of the upper and lower auxiliary plates  22  and  20 , so that attaching and detaching of the upper auxiliary plate  22  to which the polishing pad  16  is adhered in relation to the lower auxiliary plate  20  is possible. 
     Also, the first adhering member  24  and second adhering member  26  consisting of double sided tape or the like shown in the first through eighth embodiments are preferably kept at the adhering surface of a special member side when removing the upper and lower auxiliary plates  22  and  20  or the rotating surface plate  14 . This is because by doing this, handling of the upper and lower auxiliary plates  22  and  20  and the first and second adhering members  24  and  26  in a removed state is easier. Note that which of the adhesion surfaces the first and second adhering members  24  and  26  remain on can be set by things such as making the adhesive force of both surfaces of the first adhering member and second adhering member  24  and  26  themselves different from each other, or also by making the surface roughness or the material or the like of the adhered upper and lower auxiliary plates  22  and  20  or the rotating surface plate  14  different from each other. 
     In particular, the first adhering member  24  is preferably kept on the adhesion surface of the lower auxiliary plate  20  side when removing the lower auxiliary plate  20 , making it easy to perform a maintenance of the top surface  18  of the rotating surface plate  14 . Meanwhile, the second adhering member  26 , as shown in  FIG. 2  with the first embodiment, can be kept on the adhesion surface of the upper auxiliary plate  22  side when removing the upper auxiliary plate  22 , or for example, as with the ninth embodiment of the present invention shown in  FIG. 15 , can be left on the top surface of the lower auxiliary plate  20 . Note that by keeping the second adhering member  26  on the adhesion surface of the upper auxiliary plate  22  side, it is possible to do attachment using the second adhering member  26  held on the upper auxiliary plate  22  when mounting the removed upper auxiliary plate  22  on the rotating surface plate of the re-processing device such as for grooving or the like of the polishing pad  16 . Meanwhile, by keeping the second adhering member  26  on the adhesion surface of the lower auxiliary plate  20  side, when mounting a separate upper auxiliary plate  22  for which a separate polishing pad  16  is mounted on the lower auxiliary plate  20 , it is possible to do attachment using the second adhering member  26  kept on the lower auxiliary plate  20 . 
     Also, the engaging concave parts  32 ,  44 ,  60 ,  72 ,  80 , ( 83 ), and  88  and the engaging convex parts  36 ,  46 ,  56 ,  70 ,  78 , and  90  shown in the first through seventh embodiments can also be provided on the mutually opposite sides at the lower auxiliary plate  20  side and the upper auxiliary plate  22  side. As shown in  FIG. 16 , with the tenth embodiment of the present invention, for example, while forming the stepped surface  30  and the engaging concave part  32  constituting the engaging outer circumference surface for the polishing pad auxiliary plate  10  shown in  FIGS. 1 and 2  as a first embodiment on the upper auxiliary plate  22 , it is possible to form the stepped surface  34  and the engaging convex part  36  constituting the engaging inner circumference surface on the lower auxiliary plate  20 . 
     Furthermore, it is also possible to give an inclined angle to the outer circumference surface of the engaging convex part and the inner circumference surface of the engaging concave part which align the upper and lower auxiliary plates  22  and  20  overlapped with each other with the engaging concave parts  32 ,  44 ,  60 ,  72 ,  80 , and ( 83 ) and the engaging convex parts  36 ,  46 ,  56 ,  70 , and  78  shown in the first through sixth embodiments. For example, as shown in  FIG. 17 , the eleventh embodiment of the present invention, while giving a taper in an inclined direction for which the engaging convex part  36  gradually becomes a taper in the projection direction to the stepped surface  34  as the engaging inner circumference surface of the engaging convex part  36  formed projecting at the outer circumference part of the lower auxiliary plate  20 , it is possible to give an inclined direction and incline angle taper corresponding to the stepped surface  34  to the stepped surface  30  as the engaging outer circumference surface of the engaging concave part  32  formed at the outer circumference part of the upper auxiliary plate  22 . This makes it possible to more easily perform the work of fitting the engaging convex part  36  into the engaging concave part  32  and overlapping the upper and lower auxiliary plates  22  and  20  by using the taper given to both the stepped surfaces  34  and  30  as a guide surface. 
     Incidentally, as shown by the twelfth embodiment of the present invention noted in  FIG. 18  and the thirteenth embodiment of the present invention noted in  FIG. 19 , even when using the plurality of projection shaped engaging convex parts  78  formed independently in the circumference direction of the lower auxiliary plate  20 , and the plurality of hole-shaped engaging concave parts  80  formed at each corresponding position of the upper auxiliary plates  22 , it is possible to give an incline angle to the outer circumference surface of the projecting tip part of the engaging convex part  78 , and to form a taper shaped taper part  104 . Note that with  FIG. 19 , the engaging convex part  78  is adhered by press fitting or the like by a latch pin  106  formed as a separate unit in relation to the fitting hole  105  formed on the lower auxiliary plate  20 , and a similar taper part  104  as the top edge is also given to the bottom edge of this latch pin  106 . By so doing, the directionality of the latch pin  106  is eliminated so handling becomes easier, and also, the work of press fitting to the fitting hole  105  becomes easier. 
     Also, with the fourteenth embodiment of the present invention shown in  FIG. 20 , as one type of alignment member for matching the center axes in a state with the upper and lower auxiliary plates  22  and  20  overlapped, an aligning sleeve  108  which straddles across those upper and lower auxiliary plates  22  and  20  and is extrapolated is shown. This aligning sleeve  108  has the same or a slightly larger inner diameter dimension than the outer diameter dimension of the upper and lower auxiliary plates  22  and  20  which are circular disk shapes of approximately the same outer diameter dimensions to each other, and is formed by a metal material or synthetic resin material. Using this kind of aligning sleeve  108  when overlapping the upper and lower auxiliary plates  22  and  20 , by overlapping the upper and lower auxiliary plates  22  and  20  within the aligning sleeve  108 , it is possible to overlap the upper and lower auxiliary plates  22  and  20  in the axis direction while matching the center axes, and to mutually adhere them with the second adhering member  26 . Because of that, it is possible to remove the aligning sleeve  108  after overlapping and mutually adhering the upper and lower auxiliary plates  22  and  20 , making it possible to mutually adhere the upper and lower auxiliary plates  22  and  20  in a state without having an alignment member projecting above the outer circumference surface and in a state accurately aligned. 
     Furthermore, with the fifteenth embodiment of the present invention shown in  FIG. 21 , a slit shaped engaging groove  110  extending straddling in the overlapping direction in a state with the upper and lower auxiliary plates  22  and  20  overlapped is formed. This engaging groove  110  has a specified depth in the radial direction inward direction opened at the outer circumference surface of the upper and lower auxiliary plates  22  and  20 , and a plurality of these are provided mutually independently in the circumference direction of the upper and lower auxiliary plates  22  and  20 . Then, by fitting a plate shaped engaging plate  112  from the opening part of the outer circumference surface in this engaging groove  110 , the upper and lower auxiliary plates  22  and  20  are aligned to each other by this engaging plate  112 , and they are also in a mutually linked state. Note that this engaging plate  112  is formed as a separate unit from the upper and lower auxiliary plates  22  and  20 , but for example it is also possible to integrally form this having a shape projecting toward the other of one of either the upper or lower auxiliary plates  22  or  20 . In this case, the engaging groove  110  is formed only on the concerned other of the auxiliary plates. 
     Also, with the sixteenth embodiment of the present invention shown in  FIG. 22 , an engaging concave part  114  is formed as the engaging concave part that opens at the bottom surface of the upper auxiliary plate  22 . In particular with this embodiment, this engaging concave part  114  is formed as a ring shaped groove extending continuously in the circumference direction around the center axis of the upper auxiliary plate  22 . Meanwhile, an engaging convex part  116  is formed on the lower auxiliary plate  20  as the engaging convex part projecting upward at the top surface which is overlapped on the upper auxiliary plate  22 . Note that with this embodiment, this engaging convex part  116  is formed as a ring shaped convex part corresponding to the engaging concave part  114 . Then, in a state with the upper and lower auxiliary plates  22  and  20  overlapped, the engaging convex part  116  enters into the engaging concave part  114  for alignment. 
     Also, the engaging convex part  116  has a hollow constitution, and a sealed fluid pool  118  is formed in an external space on the interior of the engaging convex part  116 . Furthermore, the wall part of the engaging convex part  116  which delineates this fluid pool  118  is made so that at least the inner circumference wall and the outer circumference wall are able to bulge and deform facing the radial direction. In specific terms, for example by the engaging convex part  116  being formed by a rubber elastic body or the like, it is possible to realize an inner circumference wall that can bulge in the radial direction inward and an outer circumference wall that can bulge in the radial direction outward. 
     Furthermore, a fluid passage  120  that opens at the outer circumference surface extending out in the radial direction outward is formed communicating with the fluid pool  118  on the lower auxiliary plate  20 , and also, a pressure screw  122  is screwed in at the outer circumference edge opening part of this fluid passage  120 . Also, an incompressible fluid such as oil or the like is filled in a sealed area consisting of the fluid passage  120  sealed by the pressure screw  122  and the fluid pool  118 . 
     By screwing in the pressure screw  122 , the internal pressure of the fluid pool  118  is raised through the fluid passage  120 , and it is possible to have the fluid pool  118  inner circumference wall and outer circumference wall bulge outward. As a result, the engaging convex part  116  expands and is pressed on the inner surface of the engaging concave part  114 , and it is possible to align the upper and lower auxiliary plates  22  and  20  to each other by the mutual friction force or the like, and also to apply adhesive force. 
     Note that when removing the upper auxiliary plate  22  from the lower auxiliary plate  20 , by doing the rotation operation in the direction that loosens the pressure screw  122 , and moving to the outer circumference side of the lower auxiliary plate  20 , it is possible to reduce the pressure of the fluid pool  118  and to cancel the pressing force of the engaging convex part  116  on the engaging concave part  114 . 
     In addition, though not listed one by one, with the present invention, it is possible to implement additional changes, revisions, modifications or the like of various types based on the knowledge of a person skilled in the art, and for example it is possible to prevent infiltration of foreign substances to the overlapping surfaces or the like of the upper and lower auxiliary plates by mounting an O-ring or sealing material at the engagement portions of the engaging convex part and the engaging concave part. 
     Also, in addition to the two layer structure auxiliary plates  20  and  22  described above, it is also possible to add another auxiliary plate adhered in a laminated state using the adhering means. By using this kind of third layer auxiliary plate, it is possible to realize an elastic support state, or a state such as the middle layer being disposable or the like.