Patent Publication Number: US-2023162990-A1

Title: Package device manufacturing method

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a package device manufacturing method in which device chips are placed on a workpiece such as a semiconductor wafer and are sealed by a mold resin and the workpiece is divided for each device chip to form the package devices. 
     Description of the Related Art 
     In recent years, trends toward size reduction and thickness reduction of various types of electronic equipment typified by mobile phones and personal computers have been remarkable. In association with this, demands for size reduction and enhancement in the integration degree have been continuing to grow regarding device chips that are mounted in the pieces of electronic equipment and are used. In particular, as a packaging technique for device chips, a technique in which a plurality of device chips are placed on a substrate and are sealed by a sealing material (mold resin) and dicing into individual pieces is executed after a redistribution layer (RDL) is formed is attracting attention. According to this technique, thickness reduction and cost reduction of the chips and shortening of the distance of interconnects are possible. 
     However, when the whole surface of the substrate on which the device chips are placed is coated with the mold resin and is sealed, warpage occurs in the whole of the substrate due to shrinkage of the mold resin, and difficulty of subsequent processing of the substrate increases. Thus, in order to reduce the amount of the mold resin disposed and suppress the warpage of the substrate, the following technique has been proposed. Recessed parts are made in a substrate, and device chips are disposed in the recessed parts. Then, the substrate is coated with a mold resin, and thereafter, the substrate is ground to remove the mold resin outside the recessed parts (see JP-T-2019-512168). In this technique, the grinding is executed until the substrate is exposed outside the recessed parts. Further, there has been proposed a technique in which another member is disposed in advance on a surface of a substrate other than regions in which device chips are mounted, the device chips are disposed in the regions, and the substrate is sealed by a mold resin together with the member and the device chips (see JP 2020-92147A). In this technique, the member that is placed on the substrate and is sealed by the mold resin together with the substrate is referred to as a gap filling member. In this technique, the mold resin placed on the gap filling member is ground until the gap filling member is exposed. 
     In these techniques, the warpage of the substrate attributed to the mold resin is reduced by grinding the mold resin disposed on the substrate and reducing the amount of the mold resin that remains on the substrate. Thereafter, further processing is executed for the substrate that has been thinned and planarized by the grinding, so that the substrate is divided, and individual package devices are formed. 
     SUMMARY OF THE INVENTION 
     For the gap filling member, a material, such as silicon, in which the coefficient of thermal expansion and so forth are low compared with the mold resin is used. Owing to this, the warpage of the substrate attributed to the gap filling member is prevented. However, when the mold resin placed on the gap filling member is removed and the gap filling member exposed is ground, chipping or breakage easily occurs in the gap filling member. Further, also in the technique in which recessed parts are formed in a substrate, the substrate is coated with a mold resin, and grinding is executed, chipping or breakage easily occurs in the substrate when the mold resin placed on the substrate outside the recessed parts is removed and the exposed substrate is ground. It is considered that this is because a fractured layer is formed in the gap filling member or the substrate when the gap filling member or the like is exposed and ground and the chipping or breakage grows from the fractured layer due to stress attributed to the mold resin. The occurrence of chipping or breakage causes the package device finally obtained to become a defective product. Thus, it is required to establish a method for simultaneously processing the gap filling member or the substrate and the mold resin to thin the substrate without causing the occurrence of chipping or breakage in the gap filling member or the substrate. 
     Thus, an object of the present invention is to provide a package device manufacturing method in which a workpiece sealed by a mold resin together with device chips is thinned and planarized with suppression of the occurrence of breakage or chipping and the workpiece is divided. 
     In accordance with an aspect of the present invention, there is provided a package device manufacturing method. The manufacturing method includes a workpiece preparation step of preparing a workpiece in which a plurality of planned dividing lines that intersect each other are set on a side of one surface and that has a first region on which a device chip is disposed and a second region outside the first region in each zone marked out by the planned dividing lines in the one surface, a device chip disposing step of disposing the device chips on the first regions of the workpiece, and a resin molding step of, after the workpiece preparation step and the device chip disposing step, supplying a mold resin to the second regions higher than the first regions and the first regions and covering the device chips and the workpiece by the mold resin. The manufacturing method includes also a resin thinning step of, after the resin molding step, processing and thinning the mold resin from the side of the one surface of the workpiece to a thickness with which the second regions of the workpiece covered by the mold resin are not exposed and the device chips disposed on the first regions are not exposed, a polishing step of, after the resin thinning step, polishing the mold resin from the side of the one surface by a polishing pad to expose the second regions of the workpiece and further polishing the mold resin and the second regions, the mold resin being disposed on the first regions, by the polishing pad to form a flat surface including the mold resin and the second regions on the side of the one surface of the workpiece, and a dividing step of dividing the workpiece along the planned dividing lines to manufacture individual package devices each including the device chip. 
     Preferably, the first regions of the workpiece include recessed parts formed in the workpiece. 
     Further, preferably, in the workpiece preparation step, the workpiece having, in the one surface, the first regions located in openings by placing a gap filling member having the openings on a substrate and the second regions located outside the openings is prepared, and the gap filling member is formed of a material regarding which an expansion rate of volume when temperature rises or the expansion rate of the volume when pressure lowers is lower than the mold resin. 
     More preferably, the gap filling member has a same planar shape as a planar shape of the substrate, and the openings of the gap filling member include through-holes or recessed parts. 
     Further, preferably, the package device manufacturing method further includes a measurement step of, before the resin thinning step, measuring a thickness of the workpiece covered by the mold resin, in order to decide an amount of removal by which the mold resin is removed in the resin thinning step. In addition, in the measurement step, the thickness of the workpiece in the second region is measured from a side of the other surface on a side opposite to the one surface by a non-contact thickness measuring instrument. 
     Moreover, preferably, in the resin molding step, the second regions of the workpiece to be covered by the mold resin are higher than upper ends of the device chips disposed on the first regions. 
     In accordance with another aspect of the present invention, there is provided a package device manufacturing method. The manufacturing method includes a workpiece preparation step of preparing a workpiece in which a plurality of planned dividing lines that intersect each other are set in one surface, a device chip disposing step of disposing a device chip on each zone marked out by the planned dividing lines in the one surface of the workpiece, and a resin molding step of, after the workpiece preparation step and the device chip disposing step, supplying a mold resin to a side of the one surface of the workpiece and covering the device chips and the workpiece by the mold resin. The manufacturing method includes also a resin thinning step of, after the resin molding step, processing and thinning the mold resin from the side of the one surface of the workpiece to a thickness with which the device chips are not exposed, a polishing step of, after the resin thinning step, polishing the mold resin from the side of the one surface of the workpiece by a polishing pad to expose the device chips and further polishing the mold resin and the device chips by the polishing pad to form a flat surface including the mold resin and the device chips, and a dividing step of dividing the workpiece along the planned dividing lines to manufacture individual package devices each including the device chip. 
     Preferably, in the resin thinning step, the mold resin is thinned by being ground by grinding abrasive stones. 
     In the package device manufacturing method according to one aspect of the present invention, when the mold resin that covers the workpiece is ground, the grinding is ended before the part covered by the mold resin is exposed. Further, thereafter polishing is executed to remove the whole of the mold resin in a partial region, and the polishing is further advanced to form the flat surface including the remaining mold resin. That is, the grinding is not executed for the part exposed through the removal of the mold resin, and a fractured layer attributed to the grinding is not formed. Thus, breakage or chipping originating from the fractured layer does not occur. 
     Therefore, by one aspect of the present invention, a package device manufacturing method in which a workpiece sealed by a mold resin together with device chips is thinned and planarized with suppression of the occurrence of breakage or chipping and the workpiece is divided is provided. 
     The above and other objects, features and advantages of the present invention and the manner of realizing them will become more apparent, and the invention itself will best be understood from a study of the following description and appended claims with reference to the attached drawings showing a preferred embodiment of the invention. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a perspective view schematically illustrating a grinding polishing apparatus; 
         FIG.  2    is a plan view schematically illustrating a turntable, grinding units, and a polishing unit; 
         FIG.  3 A  is a perspective view schematically illustrating a workpiece according to a first example; 
         FIG.  3 B  is a perspective view schematically illustrating the state in which a workpiece according to a second example is prepared; 
         FIG.  4 A  is a sectional view schematically illustrating the workpiece in which recessed parts have not yet been formed; 
         FIG.  4 B  is a sectional view schematically illustrating the workpiece according to the first example; 
         FIG.  4 C  is a sectional view schematically illustrating the workpiece in a device chip disposing step; 
         FIG.  5 A  is a sectional view schematically illustrating the workpiece in a resin molding step; 
         FIG.  5 B  is a sectional view schematically illustrating the ground workpiece; 
         FIG.  5 C  is a sectional view schematically illustrating the polished workpiece; 
         FIG.  6 A  is a sectional view schematically illustrating the workpiece at a first stage of a processing step; 
         FIG.  6 B  is a sectional view schematically illustrating the workpiece at a second stage of the processing step; 
         FIG.  6 C  is a sectional view schematically illustrating the workpiece at a third stage of the processing step; 
         FIG.  7 A  is a sectional view schematically illustrating the workpiece at a fourth stage of the processing step; 
         FIG.  7 B  is a sectional view schematically illustrating the workpiece at a fifth stage of the processing step; 
         FIG.  8 A  is a sectional view schematically illustrating the workpiece at a sixth stage of the processing step; 
         FIG.  8 B  is a sectional view schematically illustrating the workpiece at a seventh stage of the processing step; 
         FIG.  8 C  is a sectional view schematically illustrating the workpiece in a dividing step; 
         FIG.  9 A  is a sectional view schematically illustrating a substrate of the workpiece according to the second example; 
         FIG.  9 B  is a sectional view schematically illustrating the workpiece for which an adhesive layer is formed over a front surface; 
         FIG.  9 C  is a sectional view schematically illustrating the workpiece according to the second example; 
         FIG.  10 A  is a sectional view schematically illustrating the workpiece in the device chip disposing step; 
         FIG.  10 B  is a sectional view schematically illustrating the workpiece for which a measurement step is executed; 
         FIG.  11 A  is a sectional view schematically illustrating the workpiece for which a resin thinning step has been executed; 
         FIG.  11 B  is a sectional view schematically illustrating the workpiece for which a polishing step has been executed; 
         FIG.  11 C  is a sectional view schematically illustrating a package device formed through execution of the dividing step; 
         FIG.  12 A  is a sectional view schematically illustrating the state in which a device chip is disposed on a workpiece according to a third example; 
         FIG.  12 B  is a sectional view schematically illustrating the workpiece in the resin molding step; 
         FIG.  13 A  is a sectional view schematically illustrating the workpiece for which the resin thinning step has been executed; 
         FIG.  13 B  is a sectional view schematically illustrating the workpiece for which the polishing step has been executed; 
         FIG.  13 C  is a sectional view schematically illustrating a package device formed through execution of the dividing step; and 
         FIG.  14    is a flowchart illustrating the flow of each step of a package device manufacturing method. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. First, a grinding polishing apparatus with which a resin thinning step and a polishing step of a package device manufacturing method according to the present embodiment will be described.  FIG.  1    is a perspective view schematically illustrating a grinding polishing apparatus  2  that grinds a workpiece and further polishes it. The grinding polishing apparatus  2  executes grinding processing and polishing processing for a workpiece such as a silicon wafer. The grinding polishing apparatus  2  includes a base  4  that supports constituent elements that configure the grinding polishing apparatus  2 . An opening  4   a  is formed in the upper surface of the base  4  on the front end side, and a conveying unit (conveying mechanism)  6  is disposed inside the opening  4   a.  Further, in a region on the front side of the opening  4   a,  a cassette placement pedestal  4   b  on which a cassette  8  is placed and a cassette placement pedestal  4   c  on which a cassette  10  is placed are disposed. For example, a plurality of workpieces that have not yet been processed are housed in the cassette  8 , and a plurality of workpieces that have been processed are housed in the cassette  10 . 
     A tape-shaped protective member (not illustrated) that protects the workpiece may be stuck to the lower surface side of the workpiece for which grinding processing and polishing processing are executed by the grinding polishing apparatus  2 . Specifically, the protective member includes a circular base and an adhesive layer (glue layer) disposed on the base. The base is composed of resin such as polyolefin, polyvinyl chloride, or polyethylene terephthalate, and the adhesive layer is composed of an epoxy-based, acrylic-based, or rubber-based adhesive or the like. Further, it is also possible to use an ultraviolet-curable resin that cures through irradiation with ultraviolet for the adhesive layer. The workpiece to which the protective member is stuck is housed in the cassette  8  illustrated in  FIG.  1   , and the cassette  8  that houses a plurality of workpieces is placed on the cassette placement pedestal  4   b.  Then, the conveying unit  6  draws out one workpiece from the cassette  8  and conveys it. 
     A position adjustment mechanism (alignment mechanism)  12  is disposed on a diagonally rear side of the opening  4   a  of the grinding polishing apparatus  2 . The workpiece housed in the cassette  8  is conveyed to the position adjustment mechanism  12  by the conveying unit  6 . Then, the position adjustment mechanism  12  adjusts the workpiece to a predetermined position and disposes it. A conveying unit (conveying mechanism, loading arm)  14  that holds the workpiece and turns is disposed at a position adjacent to the position adjustment mechanism  12 . The conveying unit  14  includes a suction adhesion pad that causes suction adhesion of the upper surface side of the workpiece, holds, through suction adhesion, the workpiece for which position adjustment has been executed by the position adjustment mechanism  12 , by the suction adhesion pad, and conveys the workpiece rearward. 
     A circular disc-shaped turntable  16  is disposed on the rear side of the conveying unit  14 . The turntable  16  is coupled to a rotational drive source (not illustrated) such as a motor and rotates around a rotation axis substantially parallel to a Z-axis direction (vertical direction, upward-downward direction). Further, on the turntable  16 , a plurality of (in  FIG.  1    and so forth, four) chuck tables (holding tables)  18  that hold the workpiece are disposed at substantially equal intervals along the circumferential direction of the turntable  16 . 
     In  FIG.  2   , a plan view schematically illustrating the four chuck tables  18  placed on the turntable  16  is included. The upper surfaces of the chuck tables  18  configure holding surfaces  18   a  that hold the workpiece. The holding surfaces  18   a  are each formed into a planar shape similar to that of the workpiece and into a size equivalent to that of the workpiece. The holding surfaces  18   a  are connected to a suction source (not illustrated) such as an ejector through a flow path (not illustrated) formed inside the chuck table  18 . There is no limit on the kind and structure of the chuck table that holds the workpiece. For example, a chuck table that holds the workpiece by a mechanical method, an electrical method, or the like may be used instead of the chuck table  18 . The chuck tables  18  are each coupled to a rotational drive source (not illustrated) such as a motor and rotate around a rotation axis substantially parallel to the Z-axis direction. Further, the turntable  16  rotates in an anticlockwise manner (direction indicated by an arrow a) in plan view and positions each chuck table  18  to a conveyance position A, a rough grinding position B, a finish grinding position C, a polishing position D, and a conveyance position A in that order. In addition, the conveying unit  14  conveys the workpiece disposed at the position adjustment mechanism  12  onto the chuck table  18  positioned to the conveyance position A. 
     A column-shaped support structure  20  is disposed on each of the rear side of the rough grinding position B and the rear side of the finish grinding position C (rear side of the turntable  16 ). Z-axis movement mechanisms  22  are disposed on the front face side of the support structures  20 . The Z-axis movement mechanisms  22  each include a pair of Z-axis guide rails  24  disposed in substantially parallel to the Z-axis direction, and plate-shaped Z-axis moving plates  26  are mounted on the pair of Z-axis guide rails  24  slidably along the Z-axis guide rails  24 . A nut part (not illustrated) is disposed on the rear face side (back surface side) of the Z-axis moving plates  26 , and Z-axis ball screws  28  disposed in substantially parallel to the Z-axis guide rails  24  are each screwed to this nut part. Further, Z-axis pulse motors  30  are each coupled to one end part of the Z-axis ball screw  28 . When the Z-axis ball screw  28  is rotated by the Z-axis pulse motor  30 , the Z-axis moving plate  26  moves in the Z-axis direction along the Z-axis guide rails  24 . 
     A grinding unit  32   a  that executes rough grinding of the workpiece is mounted on the front face side (front surface side) of the Z-axis moving plate  26  disposed above the rough grinding position B. Meanwhile, a grinding unit  32   b  that executes finish grinding of the workpiece is mounted on the front face side (front surface side) of the Z-axis moving plate  26  disposed above the finish grinding position C. Movement of the grinding units  32   a  and  32   b  in the Z-axis direction is controlled by the Z-axis movement mechanisms  22 . 
     The grinding units  32   a  and  32   b  each include a circular cylindrical housing  34  mounted on the Z-axis moving plate  26 . Circular cylindrical spindles  36  that configure a rotation axis are rotatably housed in the housings  34 , and lower end parts (tip parts) of the spindles  36  protrude from the lower ends of the housings  34 . A grinding wheel  38   a  for executing rough grinding of the workpiece is mounted on the lower end part of the spindle  36  included in the grinding unit  32   a.  Further, a grinding wheel  38   b  for executing finish grinding of the workpiece is mounted on the lower end part of the spindle  36  included in the grinding unit  32   b.    
     The grinding wheels  38   a  and  38   b  mounted in the grinding units  32   a  and  32   b  each include a circular annular base composed of such metal as stainless steel or aluminum. Moreover, on the lower surface side of the bases, a plurality of grinding abrasive stones  38   c  and  38   d  for grinding the workpiece are arranged in a circular annular manner at substantially equal intervals. For example, the grinding abrasive stones  38   c  and  38   d  are formed by fixing abrasive grains composed of diamond, cubic boron nitride (cBN), or the like by a bond such as a metal bond, a resin bond, or a vitrified bond. However, there is no limit on the material, shape, structure, size, and so forth of the grinding abrasive stones  38   c  and  38   d.  Further, the numbers of grinding abrasive stones  38   c  and  38   d  included in the grinding wheels  38   a  and  38   b  can freely be set. 
     A rotational drive source (not illustrated) such as a motor is connected to the upper end side (base end side) of the spindles  36 . The grinding wheels  38   a  and  38   b  rotate around a rotation axis substantially parallel to the Z-axis direction by a rotational force transmitted from this rotational drive source through the spindle  36 . Moreover, a grinding liquid supply path (not illustrated) for supplying a grinding liquid such as pure water is made inside the grinding units  32   a  and  32   b.  The grinding liquid is supplied toward the workpiece and the grinding abrasive stones  38   c  or  38   d  when grinding processing is executed for the workpiece. 
     The grinding unit  32   a  grinds, by the grinding abrasive stones  38   c,  the workpiece held by the chuck table  18  positioned to the rough grinding position B. As a result, rough grinding processing of the workpiece is executed. Further, the grinding unit  32   b  grinds, by the grinding abrasive stones  38   d,  the workpiece held by the chuck table  18  positioned to the finish grinding position C. As a result, finish grinding processing of the workpiece is executed. 
     A column-shaped support structure  40  is disposed on a lateral side of the polishing position D (lateral side of the turntable  16 ). An XZ-axes movement mechanism  42  is disposed on the front surface side of the support structure  40  (side of the turntable  16 ). The XZ-axes movement mechanism  42  includes a pair of first guide rails  44  disposed in substantially parallel to an X-axis direction (front-rear direction), and a plate-shaped first moving plate  46  is mounted on the pair of first guide rails  44  slidably along the first guide rails  44 . 
     A nut part (not illustrated) is disposed on the back surface side of the first moving plate  46 , and a first ball screw  48  disposed in substantially parallel to the first guide rails  44  is screwed to this nut part. Further, a first pulse motor  50  is coupled to one end part of the first ball screw  48 . When the first ball screw  48  is rotated by the first pulse motor  50 , the first moving plate  46  moves in the X-axis direction along the first guide rails  44 . A pair of second guide rails  52  disposed in substantially parallel to the Z-axis direction are disposed on the front surface side of the first moving plate  46  (side of the turntable  16 ). A plate-shaped second moving plate  54  is mounted on the pair of second guide rails  52  slidably along the second guide rails  52 . A nut part (not illustrated) is disposed on the back surface side of the second moving plate  54 , and a second ball screw  56  disposed in substantially parallel to the second guide rails  52  is screwed to this nut part. 
     A second pulse motor  58  is coupled to one end part of the second ball screw  56 . When the second ball screw  56  is rotated by the second pulse motor  58 , the second moving plate  54  moves in the Z-axis direction along the second guide rails  52 . Further, a polishing unit  60  that polishes the workpiece is mounted on the front surface side of the second moving plate  54  (side of the turntable  16 ). Movement of the polishing unit  60  in the X-axis direction and the Z-axis direction is controlled by the XZ-axes movement mechanism  42 . 
     The polishing unit  60  includes a circular cylindrical housing  62  mounted on the second moving plate  54 . A circular cylindrical spindle  64  that configures a rotation axis is rotatably housed in the housing  62 , and a lower end part of the spindle  64  protrudes from the lower end of the housing  62 . A circular disc-shaped polishing pad  66  for polishing the workpiece is mounted on the lower end part of the spindle  64 . Further, a rotational drive source (not illustrated) such as a motor is connected to the upper end side (base end side) of the spindle  64 . The polishing pad  66  rotates around a rotation axis substantially parallel to the Z-axis direction by a rotational force transmitted from this rotational drive source through the spindle  64 . The polishing unit  60  polishes, by the polishing pad  66 , the workpiece held by the chuck table  18  positioned to the polishing position D. As a result, polishing processing of the workpiece is executed. 
     A conveying unit (conveying mechanism, unloading arm)  68  that holds the workpiece and turns is disposed at a position adjacent to the conveying unit  14 . The conveying unit  68  includes a suction adhesion pad that causes suction adhesion of the upper surface side of the workpiece, holds, through suction adhesion, the workpiece disposed on the chuck table  18  disposed at the conveyance position A, by the suction adhesion pad, and conveys the workpiece forward. Further, a cleaning unit (cleaning mechanism)  70  that cleans the processed workpiece by a cleaning liquid such as pure water is disposed on the front side of the conveying unit  68 . The workpiece cleaned by the cleaning unit  70  is conveyed by the conveying unit  6  and is housed in the cassette  10 . That is, a plurality of workpieces processed by the grinding units  32   a  and  32   b  and the polishing unit  60  are housed in the cassette  10 . 
     A specific example of operation of the grinding polishing apparatus  2  when the workpiece is subjected to grinding processing and polishing processing by the grinding polishing apparatus  2  will be described. In the processing of the workpiece, first, a plurality of workpieces that have not yet been processed are housed in the cassette  8 , and the cassette  8  is placed on the cassette placement pedestal  4   b.  Next, one workpiece housed in the cassette  8  is conveyed to the position adjustment mechanism  12  by the conveying unit  6 , and position adjustment of the workpiece is executed by the position adjustment mechanism  12 . Then, the workpiece for which the position adjustment has been executed is conveyed, by the conveying unit  14 , onto the chuck table  18  disposed at the conveyance position A. The workpiece is disposed over the chuck table  18  in such a manner that the lower surface is opposed to the holding surface  18   a  and the upper surface is exposed upward. By causing a negative pressure of the suction source to act on the holding surface  18   a  in this state, the workpiece is held under suction by the chuck table  18  with the interposition of the protective member. 
     Next, the turntable  16  rotates, and the chuck table  18  that holds the workpiece is disposed at the rough grinding position B. Then, the workpiece held by the chuck table  18  positioned to the rough grinding position B is ground by the grinding abrasive stones  38   c  of the grinding unit  32   a.  While the chuck table  18  and the grinding wheel  38   a  are each rotated in a predetermined direction at a predetermined rotation speed, the grinding wheel  38   a  is lowered toward the chuck table  18  by the Z-axis movement mechanism  22 . The lowering speed of the grinding wheel  38   a  at this time is adjusted to cause the plurality of grinding abrasive stones  38   c  to be pressed against the workpiece with a proper force. When the lower surfaces of the plurality of grinding abrasive stones  38   c  that rotate get contact with the workpiece, the workpiece is shaved off. As a result, grinding processing is executed for the workpiece, and the workpiece becomes thinner. Then, when the workpiece is thinned to a predetermined thickness, the rough grinding of the workpiece is completed. When the workpiece is ground by the plurality of grinding abrasive stones  38   c,  the grinding liquid such as pure water is supplied to the workpiece and the plurality of grinding abrasive stones  38   c.  By this grinding liquid, the workpiece and the plurality of grinding abrasive stones  38   c  are cooled, and dust generated due to the grinding of the workpiece (grinding dust) is washed off. 
     Next, the turntable  16  rotates, and the chuck table  18  that holds the workpiece is disposed at the finish grinding position C. Then, the workpiece held by the chuck table  18  positioned to the finish grinding position C is ground by the grinding abrasive stones  38   d  of the grinding unit  32   b.  The configuration and operation of the grinding unit  32   b  are similar to those of the grinding unit  32   a.  However, the average grain size of the abrasive grains of the grinding abrasive stones  38   d  included in the grinding wheel  38   b  is smaller than that of the abrasive grains of the grinding abrasive stones  38   c  included in the grinding wheel  38   a.  The lower surfaces of the plurality of grinding abrasive stones  38   d  included in the grinding wheel  38   b  get contact with the workpiece, and the workpiece is thereby ground. Then, when the workpiece is thinned to a predetermined thickness, the finish grinding of the workpiece is completed. 
     Next, the turntable  16  rotates, and the chuck table  18  that holds the workpiece is disposed at the polishing position D. Then, the workpiece held by the chuck table  18  positioned to the polishing position D is polished by the polishing unit  60 . When the chuck table  18  is positioned to the polishing position D, the workpiece is disposed below the polishing unit  60 . The polishing pad  66  mounted in the polishing unit  60  includes a circular disc-shaped base composed of a metal material such as stainless steel or aluminum. Further, a polishing layer that polishes the workpiece is fixed to the lower surface side of the base. For example, the polishing layer is formed into a circular disc shape with substantially the same diameter as the base and is stuck to the lower surface side of the base by an adhesive or the like. The lower surface of this polishing layer configures a polishing surface that polishes the workpiece. The polishing layer is formed by causing abrasive grains composed of silicon oxide (SiO 2 ), green carborundum (GC), white alundum (WA), or the like to be contained in a base member composed of nonwoven cloth, urethane foam, or the like. As the abrasive grains contained in the polishing layer, for example, abrasive grains whose average grain size is at least 0.1 μm and at most 10 μm are used. However, the material of the polishing layer and the grain size and material of the abrasive grains can be changed as appropriate according to the material of the workpiece, for example. 
     When the workpiece is polished, first, the polishing pad  66  is positioned to cause the polishing layer to overlap with the whole of the workpiece. Then, while the chuck table  18  and the polishing pad  66  are each rotated in a predetermined direction at a predetermined rotation speed, the polishing pad  66  is lowered toward the chuck table  18  by the XZ-axes movement mechanism  42 . The lowering speed of the polishing pad  66  at this time is adjusted to cause the polishing layer to be pressed against the workpiece with a proper force. By pressing the polishing pad  66  against the workpiece while rotating the polishing pad  66 , the workpiece is polished. Then, when the workpiece is thinned to a predetermined thickness, the polishing processing of the workpiece is completed. By this polishing processing, processing marks (cutting marks) and fractured layers formed in the workpiece when the workpiece is ground by the grinding units  32   a  and  32   b  are removed, and the upper surface of the polished workpiece is planarized. 
     In the polishing of the workpiece, liquid (polishing liquid) such as a chemical (slurry) or pure water is not supplied to the workpiece and the polishing pad  66 . That is, the workpiece is processed by dry polishing with use of the polishing pad  66  containing the abrasive grains. However, the workpiece may be processed by wet polishing. In this case, in the polishing of the workpiece, a polishing liquid that does not contain abrasive grains is supplied to the workpiece and the polishing pad  66 . As the polishing liquid, for example, a chemical such as an acid polishing liquid or an alkaline polishing liquid or pure water can be used. As the acid polishing liquid, an acid solution in which permanganate or the like is dissolved, for example, is used. As the alkaline polishing liquid, an alkaline solution in which sodium hydroxide or potassium hydroxide is dissolved, for example, is used. Further, in the wet polishing, a chemical (slurry) containing abrasive grains may be supplied to the workpiece and the polishing pad  66 . In the chemical (slurry), for example, abrasive grains composed of silicon oxide (SiO 2 ), alumina (Al 2 O 3 ), or the like are contained as loose abrasive grains. In this case, abrasive grains are not contained in the polishing pad  66 . 
     Next, the turntable  16  rotates, and the chuck table  18  that holds the workpiece is disposed at the conveyance position A. Then, the workpiece for which the grinding processing and the polishing processing have been executed is conveyed from over the chuck table  18  positioned to the conveyance position A to the cleaning unit  70  by the conveying unit  68 . Then, the workpiece after the processing is cleaned by the cleaning unit  70 . 
     Next, the package device manufacturing method according to the present embodiment will be described. In the manufacturing method, device chips are disposed on a workpiece with a flat plate shape or the like, and the device chips and the workpiece are covered by a mold resin. Then, the mold resin is partly removed to form a flat surface, and the workpiece is divided to thereby manufacture the package devices.  FIG.  14    is a flowchart illustrating the flow of steps of the package device manufacturing method according to the present embodiment. 
     First, a package device manufacturing method according to a first example of the present embodiment will be described. In the package device manufacturing method according to the first example, the package devices are manufactured through processing of a workpiece  11  illustrated in  FIG.  3 A  and so forth. For example, the workpiece  11  is a wafer formed into a circular plate shape and includes such a material as silicon (Si), sapphire (Al 2 O 3 ), gallium arsenide (GaAs), or silicon carbide (SiC). 
     The workpiece  11  includes one surface (front surface)  11   a  and the other surface (back surface)  11   b.  A plurality of planned dividing lines (streets)  13   a  and  13   b  that intersect each other are set on the side of the one surface  11   a  of the workpiece  11 , and the one surface  11   a  of the workpiece  11  is segmented into a plurality of zones  15  by the planned dividing lines  13   a  and  13   b.  For example, each zone  15  has a rectangular shape when the planned dividing lines  13   a  and  13   b  are set in a lattice manner. In each zone  15  marked out by the planned dividing lines  13   a  and  13   b  of the one surface  11   a  of the workpiece  11 , a first region  17   a  in which a device chips is disposed and a second region  17   b  outside the first region  17   a  are included. The first region  17   a  includes a recessed part formed in the workpiece  11 , for example.  FIG.  4 B  is a sectional view schematically illustrating the workpiece  11  in which a recessed part  19   a  is formed in the first region  17   a.    FIG.  4 A  is a sectional view schematically illustrating the workpiece  11  in which the recessed part  19   a  has not yet been formed. 
     In  FIG.  4 C , a sectional view of a device chip  31  disposed on the first region  17   a  of the workpiece  11  is included. For example, the device chip  31  is a circuit such as an integrated circuit (IC) or large scale integration (LSI), an image sensor such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS), or a passive member such as a capacitor or a resistor. Protruding parts  33  including a terminal part  33   a  and an adhesive layer  33   b  are disposed on the bottom surface of the device chip  31 . 
     In the package device manufacturing method according to the present embodiment, first, a workpiece preparation step S 10  of preparing the workpiece  11  is executed. As a method for preparing the workpiece  11  according to the first example, for example, the workpiece  11  with a flat plate shape like that illustrated in  FIG.  4 A  is prepared and is processed in the first regions  17   a  to form the recessed parts  19   a  like that illustrated in  FIG.  4 B  in the workpiece  11 . For example, a resist film (not illustrated) is formed on the one surface  11   a  of the workpiece  11  in the region other than the first regions  17   a  of the workpiece  11 , and etching treatment is executed for the one surface  11   a  of the workpiece  11  for a predetermined time. This can form the recessed parts  19   a  with a predetermined depth in the first regions  17   a  of the workpiece  11 . However, the method for forming the recessed parts  19   a  in the workpiece  11  is not limited thereto. For example, a circular annular cutting blade having a blade thickness equivalent to the width of the recessed part  19   a  is prepared, and the rotating cutting blade is made to cut into the first regions  17   a  of the workpiece  11  to a predetermined depth. This can form the recessed parts  19   a  with the predetermined depth. The recessed parts  19   a  may be formed by further another method. 
     After the workpiece preparation step S 10  is executed and the workpiece  11  like that illustrated in  FIG.  3 A  and  FIG.  4 B  is prepared, a device chip disposing step S 20  of disposing the device chips  31  on the first region  17   a  of the workpiece  11  is executed.  FIG.  4 C  is a sectional view schematically illustrating the workpiece  11  in which the device chip  31  is disposed on the first region  17   a.  For example, the device chips  31  are stuck to the first regions  17   a  of the workpiece  11  by the adhesive layers  33   b  of the protruding parts  33 . 
     Then, a resin molding step S 30  is executed after the workpiece preparation step S 10  and the device chip disposing step S 20 .  FIG.  5 A  is a sectional view schematically illustrating the workpiece  11  for which the resin molding step S 30  has been executed. In the resin molding step S 30 , a mold resin  35  is supplied to the second regions  17   b  higher than the first regions  17   a  and the first regions  17   a  to cover the device chips  31  and the workpiece  11  by the mold resin. For example, the mold resin  35  is supplied from the side of the one surface  11   a  of the workpiece  11  in the state in which the mold resin  35  is heated and softened, spreads to every corner of the recessed parts  19   a  of the first regions  17   a,  and thereafter cures through loss of heat over time. 
     Here, the mold resin  35  is synthesized with a synthetic resin having insulation, such as an epoxy resin, a silicone resin, a urethane resin, an unsaturated polyester resin, an acrylic urethane resin, or a polyimide resin, for example. It is preferable that a material having high heat resistance be used for the mold resin  35  so that the mold resin  35  can withstand even a formation process of penetrating electrodes  43  (see  FIG.  7 B  and so forth) to be described later, for example. However, the shrinkage factor of the mold resin  35  formed of a material having high heat resistance tends to be high, and the stress that acts on the workpiece  11 , the device chips  31 , and so forth becomes high. Thus, the significance of a polishing step S 60  to be described later is high. 
     After the resin molding step S 30 , the workpiece  11  is carried in to the grinding polishing apparatus  2  illustrated in  FIG.  1    and is ground and polished in order to planarize the side of the one surface  11   a  of the workpiece  11  while warpage of the workpiece  11  attributed to stress caused in the mold resin  35  is reduced. Next, steps executed with the grinding polishing apparatus  2  will be described in detail. 
     In the grinding polishing apparatus  2 , a resin thinning step S 50  is executed. In the resin thinning step S 50 , the mold resin  35  is processed and thinned from the side of the one surface  11   a  of the workpiece  11  to a thickness with which the second regions  17   b  of the workpiece  11  covered by the mold resin  35  are not exposed and the device chips  31  disposed on the first regions  17   a  are not exposed. For example, the resin thinning step S 50  is executed by grinding by the grinding abrasive stones  38   c  and  38   d.  For example, rough grinding of the workpiece  11  may be executed by the grinding abrasive stones  38   c  at the rough grinding position B, and thereafter, finish grinding of the workpiece  11  may be executed by the grinding abrasive stones  38   d  at the finish grinding position C. That is, the resin thinning step S 50  may be executed in two stages. 
     In the grinding polishing apparatus  2 , the workpiece  11  is conveyed onto the holding surface  18   a  of the chuck table  18  positioned to the conveyance position A. At this time, the side of the other surface (back surface)  11   b  of the workpiece  11  is made to face the holding surface  18   a,  and the side of the one surface (front surface)  11   a  is exposed upward. Then, the suction source of the chuck table  18  is actuated, and the workpiece  11  is held under suction by the chuck table  18 . Thereafter, the turntable  16  is rotated, and the chuck table  18  that holds the workpiece  11  under suction is sent to the rough grinding position B. 
     At the rough grinding position B, rough grinding of the mold resin  35  is executed from the side of the one surface  11   a  of the workpiece  11  by the grinding abrasive stones  38   c  of the grinding unit  32   a.  Specifically, the chuck table  18  and the grinding wheel  38   a  are each rotated, the grinding unit  32   a  is lowered at a comparatively high processing feed rate, and the grinding abrasive stones  38   c  are brought into contact with the mold resin  35  to execute the rough grinding of the mold resin  35 . Then, the rough grinding of the mold resin  35  is ended with a predetermined thickness left. Next, the turntable  16  is rotated, and the chuck table  18  that holds under suction the workpiece  11  for which the rough grinding has been executed is sent to the finish grinding position C. At the finish grinding position C, finish grinding of the mold resin  35  is executed from the side of the one surface  11   a  of the workpiece  11  by the grinding abrasive stones  38   d  of the grinding unit  32   b.  Specifically, the chuck table  18  and the grinding wheel  38   b  are each rotated, the grinding unit  32   b  is lowered at a comparatively slow processing feed rate, and the grinding abrasive stones  38   d  are brought into contact with the mold resin  35  to execute the finish grinding of the mold resin  35 . 
       FIG.  5 B  is a sectional view schematically illustrating the workpiece  11  for which the resin thinning step S 50  has been executed. The finish grinding of the mold resin  35  is ended with a predetermined thickness left to avoid exposure of the second regions  17   b  of the workpiece  11  and the device chips  31  covered by the mold resin  35  at the stage of the end of the finish grinding. The amount of removal of the mold resin  35  in the rough grinding, the amount of removal of the mold resin  35  in the finish grinding, and the method for deciding them will be described in detail later. When the package device manufacturing method according to the present embodiment is not employed and at least one of the second regions  17   b  of the workpiece  11  and the device chips  31  is exposed in the grinding processing, a fractured layer in which minute damage is caused is formed in the exposed surface by the grinding abrasive stones  38   d.  In this case, this crashed layer grows due to stress attributed to the mold resin  35  that partly remains on the workpiece  11 , and breakage (crack) occurs in the workpiece  11  and so forth. Thus, in the package device manufacturing method according to the present embodiment, the workpiece  11  and the device chips  31  are not exposed in the grinding processing. 
     Subsequently to the resin thinning step S 50 , the polishing step S 60  is executed. First, the turntable  16  is rotated, and the chuck table  18  that holds under suction the workpiece  11  for which the finish grinding has been executed is sent to the polishing position D. Then, the chuck table  18  and the polishing pad  66  are each rotated, the polishing unit  60  is lowered, and the polishing pad  66  is brought into contact with the mold resin  35  that covers the workpiece  11 . When the mold resin  35  is polished by the polishing pad  66  from the side of the one surface  11   a  of the workpiece  11 , the mold resin  35  is removed on the second regions  17   b  of the workpiece  11 , and the second regions  17   b  are exposed. Here, when the polishing pad  66  gets contact with the exposed second regions  17   b,  the fractured layer is not formed in the second regions  17   b  unlike the case in which the grinding abrasive stones  38   c  or  38   d  get contact with the second regions  17   b.  Thus, breakage in the second regions  17   b  due to stress attributed to the remaining mold resin  35  also does not occur. 
     In the polishing step S 60 , moreover, the mold resin  35  disposed on the first regions  17   a  and the second regions  17   b  are polished by the polishing pad  66 , and a flat surface including the mold resin  35  and the second regions  17   b  is formed on the side of the one surface  11   a  of the workpiece  11 .  FIG.  5 C  is a sectional view schematically illustrating the workpiece  11  for which the polishing step S 60  has been executed. In the polishing step S 60 , the lowering of the polishing unit  60  is stopped when the polishing unit  60  has lowered to a predetermined height position, and the polishing of the workpiece  11  is ended. 
     Depending on the thickness of the device chips  31  disposed on the first regions  17   a  of the workpiece  11  and the depth of the recessed parts  19   a  configuring the first regions  17   a,  the upper surfaces of the device chips  31  are often exposed from the mold resin  35  when the polishing step S 60  is executed. Also in this case, a crack does not occur in the device chips  31  because the grinding abrasive stones  38   c  and  38   d  do not get contact with the device chips  31 . Further, a flat surface including the second regions  17   b  of the workpiece  11 , the mold resin  35 , and the device chips  31  is formed. 
     After the resin thinning step S 50  and the polishing step S 60  are executed, the turntable  16  is rotated, and the chuck table  18  is sent to the conveyance position A. Then, the workpiece  11  is cleaned by the cleaning unit  70  and is carried out from the grinding polishing apparatus  2 . Further various kinds of steps are executed for the workpiece  11  carried out from the grinding polishing apparatus  2 . Next, one example of processing executed for the workpiece  11  after the resin thinning step S 50  and the polishing step S 60  will be described as a processing step S 70 . 
       FIG.  6 A  is a sectional view schematically illustrating the workpiece  11  at a first stage of the processing step S 70 . At the first stage, the workpiece  11  is inverted upside down to orient the one surface (front surface)  11   a  downward and orient the other surface (back surface)  11   b  upward. Then, an insulator layer  37  is formed on the other surface  11   b  of the workpiece  11 . The insulator layer  37  is a silicon oxide film, a silicon nitride film, a resin film, or the like, for example. However, the material of the insulator layer  37  is not limited thereto. The formation of the insulator layer  37  is executed by such a method as a chemical vapor deposition (CVD) method, a sputtering method, or a spin coating method, for example. 
       FIG.  6 B  is a sectional view schematically illustrating the workpiece  11  at a second stage of the processing step S 70 . At the second stage, a resist film  39  used for exposing the protruding parts  33  of the device chips  31  is formed on the insulator layer  37 . A member that becomes the material of the resist film  39  is deposited on the insulator layer  37 , and predetermined regions in the member are irradiated with light to partly alter the member. Then, a developer is caused to act, and part of the member is removed to thereby form the patterned resist film  39 . The resist film  39  has openings  41  formed at predetermined positions. 
       FIG.  6 C  is a sectional view schematically illustrating the workpiece  11  at a third stage of the processing step S 70 . At the third stage, regions exposed in the openings  41  of the resist film  39  in the insulator layer  37  are etched, and the insulator layer  37  is thinned to a predetermined thickness. This step is executed by reactive ion etching (RIE), for example. However, the step of removing part of the insulator layer  37  may be executed by another method. 
       FIG.  7 A  is a sectional view schematically illustrating the workpiece  11  at a fourth stage of the processing step S 70 . At the fourth stage, the etching is further advanced to form through-holes  41   a  that reach the terminal parts  33   a  of the device chips  31 . For example, the etching at the fourth stage may be executed by the Bosch method (Bosch process) or may be executed by RIE. The resist film  39  used for the etching executed at the third stage may be used for the etching executed at the fourth stage as it is. Alternatively, the resist film  39  may be removed after the etching executed at the third stage ends, and a new resist film may be formed by newly supplying a resin member to the side of the other surface  11   b  of the workpiece  11 , irradiating predetermined regions in the resin member with light, and causing a developer to act. In this case, the resist film suitable for the etching executed at the fourth stage can be used. 
       FIG.  7 B  is a sectional view schematically illustrating the workpiece  11  at a fifth stage of the processing step S 70 . At the fifth stage, the resist film  39  is removed, and an electrode material is supplied to the through-holes  41   a  formed at the fourth stage, to form the penetrating electrodes  43  connected to the terminal parts  33   a  of the device chips  31 . The penetrating electrodes  43  are copper penetrating electrodes formed by electrolytic plating filling treatment, for example. However, the method for forming the penetrating electrodes  43  is not limited thereto. The device chips  31  do not need to have the protruding parts  33  including the terminal parts  33   a  and may include a terminal with another configuration connected to the penetrating electrodes  43 . For example, the device chips  31  may have, instead of the protruding parts  33 , a structure formed through formation of a plurality of pillars made of copper on a surface, filling of the space among the pillars with a resin film of polyimide or the like, and planarization of the surface side by a surface planer. In this case, the protruding parts  33  do not exist on the device chips  31 , and the penetrating electrodes  43  are connected to the pillars exposed from the resin film. That is, the pillars function as a terminal part. 
       FIG.  8 A  is a sectional view schematically illustrating the workpiece  11  at a sixth stage of the processing step S 70 . At the sixth stage, an interconnect layer  45  is formed on the side of the other surface (back surface)  11   b  of the workpiece  11 . The interconnect layer  45  may include conductor parts  47  and  49  composed of a metal member patterned into a predetermined shape and an insulating film that surrounds the conductor parts  47  and  49 . More specifically, for example, a metal film is formed on the side of the other surface  11   b  of the workpiece  11 , and the metal film is patterned into a predetermined shape by a photolithography step. Then, the metal film is covered by an insulating film, and openings are made at predetermined positions in the insulating film to expose the metal film. Alternatively, an insulating film is formed on the side of the other surface  11   b  of the workpiece  11 , the insulating film is patterned into a predetermined shape, and a metal member is disposed in the regions from which the insulating film has been removed. The interconnect layer  45  is formed on the side of the other surface  11   b  of the workpiece  11  by these methods or another method. 
       FIG.  8 B  is a sectional view schematically illustrating the workpiece  11  at a seventh stage of the processing step S 70 . At the seventh stage, terminal parts  51  of new device chips  53  are connected to the conductor parts  47  and  49  of the interconnect layer  45 , and the new device chips  53  are disposed on the side of the other surface  11   b  of the workpiece  11 . Owing to this, package devices including the plurality of device chips  31  and  53  are finally obtained. Thereafter, the device chips  53  may be sealed by a new mold resin. 
     The processing step S 70  described above is one example. Optional processing is executed for the workpiece  11  for which the resin thinning step S 50  and the polishing step S 60  have been executed and the device chips  31  and  53  are packaged into each zone  15  marked out by the planned dividing lines  13 . In the package device manufacturing method according to the present embodiment, subsequently, a dividing step S 80  of dividing the workpiece  11  along the planned dividing lines  13  to manufacture individual package devices  55  each including the device chips  31  and  53  is executed. 
       FIG.  8 C  is a sectional view schematically illustrating the workpiece  11  for which the dividing step S 80  is being executed. The dividing step S 80  is executed with a cutting apparatus including a cutting unit  72 , for example. The cutting apparatus includes a chuck table that is configured similarly to the chuck table  18  of the grinding polishing apparatus  2  and is not illustrated and the cutting unit  72  that cuts the workpiece  11  held by the chuck table. The cutting unit  72  includes a spindle  74  whose base end side is connected to a rotational drive source and a cutting blade  76  fixed to the tip side of the spindle  74 . The cutting blade  76  includes a circular annular cutting edge including an abrasive stone part. When the spindle  74  is rotated, the cutting blade  76  also rotates. Further, when the cutting edge of the rotating cutting blade  76  is made to cut into the workpiece  11 , the workpiece  11  is cut. 
     In the dividing step S 80 , the cutting unit  72  is lowered to cause the lowermost end of the rotating cutting blade  76  to reach a height position that is the same as or lower than the lower end of the workpiece  11 , and the chuck table and the cutting unit  72  are relatively moved along a processing feed direction. As a result, the workpiece  11  is cut along the planned dividing line  13 , and the workpiece  11  is divided. When the workpiece  11  is divided along all planned dividing lines  13  set in the workpiece  11 , the individual package devices  55  are manufactured. 
     As described above, in the package device manufacturing method according to the present embodiment, when the mold resin  35  is partly removed in order to suppress warpage of the workpiece  11 , the second regions  17   b  of the workpiece  11  and the device chips  31  are not ground. Thus, the fractured layer associated with the grinding is not formed in the workpiece  11  and so forth, and growth and formation of a crack attributed to stress caused in the mold resin  35  or the like from the fractured layer also does not occur. 
     The description has been thus far made by taking, as the first example, the case in which a silicon wafer or the like in which the first regions  17   a  including the recessed parts  19   a  and the external thereof serves as the second regions  17   b  is the workpiece  11  and the workpiece  11  is prepared in the workpiece preparation step S 10 . However, the workpiece prepared in the workpiece preparation step S 10  may be prepared by another method. For example, the workpiece may be prepared by placing a gap filling member on a circular plate-shaped silicon wafer or the like. Next, a second example of the package device manufacturing method according to the present embodiment will be described. 
       FIG.  3 B  is a perspective view schematically illustrating the workpiece preparation step S 10  of the package device manufacturing method according to the second example. In the workpiece preparation step S 10 , prepared is a workpiece  21  that has, in one surface, first regions located in through-holes (openings)  19   b  by placing a gap filling member  25  having the through-holes (openings)  19   b  on a substrate  23  and integrating them and second regions located outside the through-hole (opening)  19   b.    
     Here, the substrate  23  is composed of such a material as silicon as with the above-described workpiece  11 .  FIG.  9 A  is a sectional view schematically illustrating the substrate  23 . Conductor parts  59  and an interconnect layer  57  may be formed on the side of one surface (front surface)  23   a  of the substrate  23  as illustrated in  FIG.  9 A  and so forth. For example, the interconnect layer  57  includes a metal layer and an insulator layer. The metal layer includes an electrically-conductive film of copper, aluminum, or the like and has a predetermined pattern. The insulator layer is formed of a silicon oxide film, a silicon nitride film, or the like. In order to integrate the substrate  23  with the gap filling member  25 , an adhesive layer is disposed on one of or both the side of the one surface  23   a  of the substrate  23  and the other surface (back surface)  25   b  of the gap filling member  25 .  FIG.  9 B  is a sectional view schematically illustrating the substrate  23  for which an adhesive layer  61  is disposed on the side of the one surface  23   a.    
     Further, for example, the gap filling member  25  is composed of such a material as silicon as with the substrate  23  and has the same planar shape as that of the substrate  23 . In the gap filling member  25 , a plurality of through-holes  19   b  that penetrate from one surface  25   a  to the other surface  25   b  or recessed parts (not illustrated) opened in the one surface  25   a  are formed. Device chips  65  (see  FIG.  10 A  and  FIG.  10 B ) are housed in the through-holes  19   b  or the recessed parts (not illustrated) as described later. That is, when the substrate  23  and the gap filling member  25  are combined to form the workpiece  21 , the through-holes  19   b  or the recessed parts define first regions  17   c  of the workpiece  21 . Further, the outside of the first regions  17   c  of the workpiece  21  serves as second regions  17   d.  The through-holes  19   b  or the recessed parts are formed in the wafer with a circular plate shape by such a method as etching. 
     Here, the gap filling member  25  is a member used to partly exclude a mold resin  69  (see  FIG.  10 B ) supplied to the workpiece  21  for the purpose of reducing warpage given to the workpiece  21  due to the mold resin  69 . Thus, it is preferable that the gap filling member  25  be formed of a material regarding which the expansion rate of the volume when the temperature rises or the expansion rate of the volume when the pressure lowers is lower than the mold resin  69  in order to avoid the occurrence of warpage due to the gap filling member  25  instead of the mold resin  69  in the workpiece  21 . 
     In the workpiece preparation step S 10 , the workpiece  21  in which the substrate  23  and the gap filling member  25  are integrated is prepared by placing and fixing the gap filling member  25  onto the substrate  23  as illustrated in  FIG.  3 B .  FIG.  9 C  is a sectional view schematically illustrating the workpiece  21  prepared through integration of the substrate  23  and the gap filling member  25 . As illustrated in  FIG.  9 C , the through-holes (openings)  19   b  of the gap filling member  25  are formed in the gap filling member  25  in such a manner as to be located in regions that become the first regions  17   c  of the workpiece  21 , when the substrate  23  and the gap filling member  25  are integrated to form the workpiece  21 . Conversely, formed is the workpiece  21  that has, in one surface  21   a,  the first regions  17   c  and the second regions  17   d,  the first regions  17   c  being located in the through-holes (openings)  19   b  by placing, on the substrate  23 , the gap filling member  25  having the through-holes (openings)  19   b,  the second regions  17   d  being located outside the through-holes (openings)  19   b.  The first regions  17   c  may include recessed parts formed in the gap filling member  25 . 
     Next, the device chip disposing step S 20  of disposing the device chips  65  on the first regions  17   c  of the workpiece  21  is executed.  FIG.  10 A  is a sectional view schematically illustrating the workpiece  21  in which the device chips  65  have been disposed in the device chip disposing step S 20 . For example, terminal parts  67  that the device chips  65  have are connected to the interconnect layer  57  of the substrate  23 . The device chips  65  may have a pillar that is surrounded by a resin film and is made of copper, instead of the terminal parts  67 , and the pillar may be connected to the interconnect layer  57  of the substrate  23 . 
     In the package device manufacturing method according to the present embodiment, the device chip disposing step S 20  does not need to be executed after the workpiece preparation step S 10 . For example, the workpiece preparation step S 10  and the device chip disposing step S 20  may be concurrently executed, or the workpiece preparation step S 10  may be executed after the device chip disposing step S 20 . In other words, before the gap filling member  25  is placed on the substrate  23 , the device chips  65  may be first disposed at positions that become the first regions  17   c  of the workpiece  21  on the substrate  23 . Then, the workpiece  21  may be prepared by thereafter placing the gap filling member  25  on the substrate  23  in such a manner that the device chips  65  are housed inside the through-holes (openings)  19   b.  In this case, it can also be said that the device chip disposing step S 20  is completed simultaneously with the workpiece preparation step S 10 . 
     After the workpiece preparation step S 10  and the device chip disposing step S 20 , the resin molding step S 30  of supplying the mold resin  69  to the second regions  17   d  and the first regions  17   c  and covering the device chips  65  and the workpiece  21  by the mold resin  69  is executed.  FIG.  10 B  is a sectional view schematically illustrating the workpiece  21  covered by the mold resin  69 . When the resin molding step S 30  is executed, the second regions  17   d  of the workpiece  21  including the one surface (front surface)  25   a  of the gap filling member  25  are higher than the first regions  17   c  of the workpiece  21  including the through-holes (openings)  19   b  of the gap filling member  25 . Next, the workpiece  21  is sent to the grinding polishing apparatus  2 , and the resin thinning step S 50  and the polishing step S 60  are executed. 
     Before the resin thinning step S 50  is executed, a measurement step S 40  of measuring the thickness of the workpiece  21  covered by the mold resin  69  may be executed in the grinding polishing apparatus  2  or at the external of the grinding polishing apparatus  2 . In the measurement step S 40 , the thickness of the workpiece  21  is measured in order to decide the amount of removal by which the mold resin  69  is removed in the resin thinning step S 50 , that is, in order to decide the amount of grinding by which the mold resin  69  is ground by the grinding abrasive stones  38   c  and  38   d.    FIG.  10 B  is a sectional view schematically illustrating the measurement step S 40 . For the measurement step S 40 , for example, a non-contact thickness measuring instrument  78  illustrated in  FIG.  10 B  is used. For example, the non-contact thickness measuring instrument  78  measures the thickness of the workpiece  21  by irradiating the workpiece  21  with such light as infrared with such a wavelength as to be transmitted through the workpiece  21  from the side of the other surface (back surface)  21   b  and detecting reflected light thereof. 
     Here, when irradiation of the side of the one surface (front surface)  21   a  of the workpiece  21  with light from the non-contact thickness measuring instrument  78  is attempted, the light is interrupted by the mold resin  69 . Thus, the non-contact thickness measuring instrument  78  irradiates the workpiece  21  with light from the side of the other surface  21   b  of the workpiece  21  (the other surface  23   b  of the substrate  23 ). The light emitted from the non-contact thickness measuring instrument  78  travels to be transmitted through the workpiece  21 . Thereafter, when the light reaches the one surface  21   a  of the workpiece  21  on which the mold resin  69  is placed (one surface  25   a  of the gap filling member  25 ), the light is reflected and travels in the workpiece  21  in the opposite direction to the direction before the reflection. Then, the reflected light reaches the other surface  21   b  of the workpiece  21  (the other surface  23   b  of the substrate  23 ) and returns to the non-contact thickness measuring instrument  78 . 
     In particular, in the measurement step S 40 , it is preferable to measure the thickness of the workpiece  21  in the second region  17   d  of the workpiece  21  by using the non-contact thickness measuring instrument  78 . Further, the amount of removal (amount of grinding) of the mold resin  69  in the resin thinning step S 50  can be decided according to the thickness of the workpiece  21  in the second region  17   d  measured in the measurement step S 40 . For example, the amount of removal (amount of grinding) of the mold resin  69  is decided in such a manner that the second regions  17   d  are not exposed in the workpiece  21  when the mold resin  69  is ground in the resin thinning step S 50  and that the second regions  17   d  can be exposed in the polishing step S 60  to be subsequently executed. In particular, it is preferable that the amount of removal (amount of grinding) in rough grinding executed by the grinding unit  32   a  of the grinding polishing apparatus  2  and the amount of removal (amount of grinding) in finish grinding executed by the grinding unit  32   b  be decided. 
     For example, when the mold resin  69  is formed with a thickness of approximately 100 μm on the workpiece  21 , it is preferable to remove the mold resin  69  by a thickness of approximately 78 μm in the rough grinding and remove the mold resin  69  by a thickness of approximately 20 μm in the finish grinding. In this case, when the resin thinning step S 50  is completed, the mold resin  69  remains with a thickness of approximately 2 μm on the second regions  17   d  of the workpiece  21 . In other words, in the resin thinning step S 50 , the rough grinding is executed in such a manner that the mold resin  69  is ground to a position higher than the holding surface  18   a  of the chuck table  18  by the height obtained by adding 22 μm to the thickness of the workpiece  21 . Then, the finish grinding is executed in such a manner that the mold resin  69  is ground to a position higher than the holding surface  18   a  by the height obtained by adding 2 μm to the thickness of the workpiece  21 .  FIG.  11 A  is a sectional view schematically illustrating the workpiece  21  for which the resin thinning step S 50  has been executed. 
     After the resin thinning step S 50  is executed, the polishing step S 60  is executed.  FIG.  11 B  is a sectional view schematically illustrating the workpiece  21  for which the polishing step S 60  has been executed. In the polishing step S 60 , for example, the mold resin  69  that remains on the second regions  17   d  of the workpiece  21  and has a thickness of approximately 2 μm is polished and removed by the polishing pad, and the second regions  17   d  of the workpiece  21  are exposed. Then, the polishing of the workpiece  21  is further advanced until the workpiece  21  is thinned by approximately 1 μm, and a flat surface including the mold resin  69  and the second regions  17   d,  the mold resin  69  remaining on the first regions  17   c,  is formed on the side of the one surface  21   a  of the workpiece  21 . The amount of removal (amount of grinding) of the mold resin  69  in the resin thinning step S 50  and the amount of removal (amount of grinding) in the polishing step S 60  may be applied to the package device manufacturing method according to the above-described first example. 
     Here, detailed description will be made about the depth of the through-holes (openings)  19   b  of the gap filling member  25 , that is, the difference in the height between the second region  17   d  and the first region  17   c.  It is preferable that the depth of the through-holes (openings)  19   b  of the gap filling member  25  be set in such a manner that the upper end of the device chip  65  does not protrude from the through-hole  19   b  when the device chips  65  are disposed on the first regions  17   c  including the through-holes (openings)  19   b.  That is, it is preferable that the depth of the through-holes  19   b  be larger than the height of the device chips  65 . In other words, it is preferable that the height of the second regions  17   d  of the workpiece  21  be higher than the first regions  17   c  by a difference that exceeds the thickness of the device chips  65 . For example, supposing that the thickness of the device chips  65  is 250 μm, it is preferable that the depth of the through-holes (openings)  19   b  of the gap filling member  25  be set to approximately 400 μm. 
     However, the depth of the through-holes (openings)  19   b  may be the same as or smaller than the height of the device chips  65 . It is preferable that the depth of the through-holes  19   b  be set in such a manner that the device chips  65  are not exposed from the mold resin  69  when the resin thinning step S 50  is executed and that the second regions  17   d  of the workpiece  21  can be exposed when the polishing step S 60  is executed. In this case, the device chips  65  are exposed from the mold resin  69  in the polishing step S 60 . 
     Further, also in the workpiece  11  of the package device manufacturing method according to the above-described first example, it is preferable that the depth of the recessed parts  19   a  that configure the first regions  17   a  (height of the second regions  17   b  relative to the first regions  17   a ) be similarly decided. More specifically, it is preferable that the depth of the recessed parts  19   a  be set in such a manner that the upper end of the device chip  31  does not protrude from the recessed part  19   a  when the device chips  31  are housed in the recessed parts  19   a.  That is, it is preferable that the depth of the recessed parts  19   a  be larger than the height of the device chips  31 . For example, when the workpiece  11  is a wafer with a thickness of 775 μm and the thickness of the device chips  31  is 250 μm, it is preferable that the depth of the recessed parts  19   a  be 400 μm. However, the depth of the recessed parts  19   a  may be the same as or smaller than the height of the device chips  31 . It is preferable that the depth of the recessed parts  19   a  be set in such a manner that the device chips  31  are not exposed from the mold resin  35  when the resin thinning step S 50  is executed and that the second regions  17   b  of the workpiece  11  can be exposed when the polishing step S 60  is executed. 
     The description of the package device manufacturing method according to the second example will be resumed. After the polishing step S 60  is executed, predetermined processing is executed for the workpiece  21 , and the dividing step S 80  is finally executed to divide the workpiece  21  along the planned dividing lines  13 . This forms individual package devices  71  like ones illustrated in  FIG.  11 C . 
     When removal of the mold resin  69  formed on the second regions  17   d  of the workpiece  21  by only grinding processing is attempted, a fractured layer is formed on the side of the one surface (front surface)  25   a  of the gap filling member  25 . In this case, a crack develops from the fractured layer due to the influence of stress attributed to the mold resin  69  that remains on the workpiece  21 . In contrast, in the package device manufacturing method according to the second example, the gap filling member  25  of the workpiece  21  is not subjected to the grinding processing, and a fractured layer is not formed in the gap filling member  25 . Therefore, the occurrence of a crack is suppressed. 
     Here, in the package device manufacturing methods according to the above-described first example and second example, description has been made about the cases in which the second regions  17   b  or  17   d  are higher than the first regions  17   a  or  17   c  in which the device chips  31  or  65  are disposed in the workpiece  11  or  21 . Further, the cases in which the mold resin  35  or  69  is ground and polished and the second regions  17   b  or  17   d  are exposed have been described. However, in the package device manufacturing method according to the present embodiment, the difference in the height does not need to exist between the regions in which the device chips are disposed and the outside thereof. Moreover, when the workpiece is ground and polished, only the device chips may be exposed from the mold resin without exposure of the workpiece. Next, a third example of the package device manufacturing method according to the present embodiment will be described. 
     First, the workpiece preparation step S 10  of preparing a workpiece in which a plurality of planned dividing lines that intersect each other are set in one surface is executed. In  FIG.  12 A , a sectional view schematically illustrating a workpiece  73  in the package device manufacturing method according to the third example is included. The workpiece  73  is a wafer formed of such a material as silicon, for example. Conductor parts  77  and an interconnect layer  75  may be formed on the side of one surface (front surface)  73   a  of the workpiece  73  prepared in the workpiece preparation step S 10  as illustrated in  FIG.  12 A  and so forth. For example, the interconnect layer  75  includes a metal layer and an insulator layer. The metal layer includes an electrically-conductive film of copper, aluminum, or the like and has a predetermined pattern. The insulator layer is formed of a silicon oxide film, a silicon nitride film, or the like. 
     Next, the device chip disposing step S 20  of disposing a device chip  81  on each zone marked out by the planned dividing lines  13  of the one surface  73   a  of the workpiece  73  is executed.  FIG.  12 A  is a sectional view schematically illustrating the workpiece  73  on which the device chip  81  is disposed. For example, terminal parts  83  that the device chips  81  have are connected to the interconnect layer  75  of the workpiece  73 . 
     After the workpiece preparation step S 10  and the device chip disposing step S 20 , the resin molding step S 30  of supplying a mold resin  85  to the side of the one surface (front surface)  73   a  of the workpiece  73  and covering the device chips  81  and the workpiece  73  by the mold resin  85  is executed.  FIG.  12 B  is a sectional view schematically illustrating the workpiece  73  covered by the mold resin  85 . 
     After the resin molding step S 30 , the workpiece  73  is sent to the grinding polishing apparatus  2 , and the resin thinning step S 50  and the polishing step S 60  are executed. In the resin thinning step S 50 , the workpiece  73  is placed on the chuck table  18  with the side of the other surface (back surface)  73   b  oriented downward, and the mold resin  85  is ground by the grinding abrasive stones  38   c  and  38   d  from the one surface side  73   a  of the workpiece  73  to a thickness with which the device chips  81  are not exposed. Regarding the procedure of the resin thinning step S 50 , reference to the description of the resin thinning step S 50  of the package device manufacturing method according to another example can be made as appropriate. 
       FIG.  13 A  is a sectional view schematically illustrating the workpiece  73  for which the resin thinning step S 50  has been executed. As illustrated in  FIG.  13 A , the mold resin  85  is left with a slight thickness on the device chips  81 . This thickness of the mold resin  85  is set to such a thickness as to be sufficiently removed in the polishing step S 60  to be described next, and the resin thinning step S 50  is executed in such a manner that the mold resin  85  remains with this thickness. For example, in the case of removing the mold resin  85  by a thickness of approximately 3 μm in the polishing step S 60 , it is preferable that the mold resin  85  be ground in the resin thinning step S 50  in such a manner that the mold resin  85  remains with a thickness of approximately 2 μm on the device chips  81 . 
     After the resin thinning step S 50 , the polishing step S 60  is executed.  FIG.  13 B  is a sectional view schematically illustrating the workpiece  73  for which the polishing step S 60  has been executed. In the polishing step S 60 , the mold resin  85  is polished by the polishing pad  66  from the side of the one surface (front surface)  73   a  of the workpiece  73 , and the device chips  81  are exposed from the mold resin  85 . In the polishing step S 60 , the mold resin  85  that remains outside the device chips  81  and the device chips  81  are further polished by the polishing pad  66 , and a flat surface including the mold resin  85  and the device chips  81  is formed. Here, a fractured layer is not formed in the device chips  81  because the grinding abrasive stones  38   c  and  38   d  have not gotten contact with the device chips  81 . Thus, extension, from the fractured layer, of a crack attributed to stress caused in the mold resin  85  that remains around the device chips  81  also does not occur. 
     Thereafter, various kinds of processing may be executed for the workpiece  73  taken out from the grinding polishing apparatus  2 . Then, the dividing step S 80  is finally executed to divide the workpiece  73  along the planned dividing lines  13 .  FIG.  13 C  is a sectional view schematically illustrating a package device  87  manufactured by dividing the workpiece  73  by the dividing step S 80 . When the dividing step S 80  is executed, the individual package devices  87  each including the device chip  81  are manufactured. As above, also when there is substantially no difference in the height between the regions in which the device chips  81  are disposed in the workpiece  73  and the outside regions thereof, the occurrence of a crack in the device chips  81  can be suppressed according to the package device manufacturing method according to the present embodiment. 
     In the package device manufacturing methods described above, the description has been made about the cases in which the mold resin  35 ,  69 , or  85  that covers the workpiece  11 ,  21 , or  73  is thinned by being ground by the grinding abrasive stones  38   c  and  38   d  in the resin thinning step S 50 . However, one aspect of the present invention is not limited thereto. That is, in the package device manufacturing method according to one aspect of the present invention, the mold resin  35 ,  69 , or  85  may be thinned by a processing method other than the grinding. 
     For example, the mold resin  35 ,  69 , or  85  may be thinned by executing single-point cutting of the mold resin  35 ,  69 , or  85  by, instead of the grinding abrasive stones  38   c  and  38   d,  a single-point cutting tool (not illustrated) having a cutting edge at the lower end. The single-point cutting is executed by a single-point cutting apparatus (surface planer). In this case, in the resin thinning step S 50 , the workpiece  11 ,  21 , or  73  is made to pass through, from a lateral side, the lower side of the single-point cutting tool that rotationally moves on a circular annular locus included in a horizontal plane, and the cutting edge of the single-point cutting tool is caused to cut the mold resin  35 ,  69 , or  85 . At this time, the relative height of the single-point cutting tool and the workpiece  11 ,  21 , or  73  is set in advance to cause the mold resin  35 ,  69 , or  85  to be removed by a predetermined amount of removal and remain with a predetermined thickness on the workpiece  11 ,  21 , or  73 . As above, in the package device manufacturing method according to one aspect of the present invention, it is also possible to execute the resin thinning step S 50  by the single-point cutting by the single-point cutting tool. 
     The present invention is not limited to the details of the above described preferred embodiment. The scope of the invention is defined by the appended claims and all changes and modifications as fall within the equivalence of the scope of the claims are therefore to be embraced by the invention.