Patent Publication Number: US-11037791-B2

Title: Substrate holder, a method for holding a substrate with a substrate holder, and a plating apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application is a continuation of U.S. patent application Ser. No. 14/998,239 filed Dec. 23, 2015, now U.S. Pat. No. 10,115,598, which claims priority to Japanese Patent Application No. 2014-265211 filed Dec. 26, 2014, all of which are incorporated herein by reference in their entirety. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a substrate holder that holds a substrate, including but not limited to a semiconductor wafer, a method for holding the substrate with the substrate holder, and a apparatus that performs plating treatment on the substrate. 
     BACKGROUND ART 
     Conventionally, it has been performed to form a wiring in a fine wiring groove, a hole, or a resist opening part provided on a surface of a substrate such as semiconductor wafer, and to form a bump, i.e. a projected electrode, which is configured to electrically connected to parts such as an electrode packaged on the surface of a substrate such as semiconductor wafer. In general, as a method for forming the wiring and the bump, an electrolytic plating method (in other words, electroplating method), a deposition method, a printing method, a ball bump method and other methods have been known, the electroplating method in which miniaturization can be made and in which performance is comparatively stable has been increasingly used for the purpose of forming the wiring and the bump on the substrate to be used in manufacturing a semiconductor chip with the increased number of I/O and the narrower pitch. 
     Concave portions are formed in a substrate, on which a plated metal layer is formed by the electrolytic plating method, by forming patterns on a resist provided on a surface of the substrate. The concave portions are arrayed on the substrate in a grid shape, and one of the grids is called a die. Since the dies are formed on the circular substrate in the grid shape, they are not evenly arrayed. Namely, a region in which the dies are not formed is present near an outer periphery of the substrate. In addition, when an identification number for identifying the substrate has been printed on the substrate, the patterns, or the dies, are not formed on a portion on which the identification number has been printed, either (i.e., the portion on which the identification number has been printed is covered with the resist). 
     When metal is deposited in the concave portions in the patterns of the resist by electrolytic plating to thereby form bumps etc., the bumps are not formed at a portion on the substrate completely covered with the resist, and thus metal ions corresponding to the portion completely covered with the resist gather in the dies adjacent to the portion in which the patterns are not formed on the resist (the portion completely covered with the resist). For this reason, since the metal ions in a plating liquid gather more easily in the dies adjacent to the portion in which the patterns are not formed on the resist compared with in the other dies (for example, a die located in a center of the substrate), bump heights of the dies are higher than those of the other dies. Hereby, since uniformity of a metal layer thickness plated on a substrate surface deteriorates, the number of superior dies is decreased, and the substrate itself may become scrap depending on a case. Accordingly, it has been required that the bump heights and wiring thicknesses of the dies adjacent to the portion in which the patterns are not formed on the resist are suppressed. 
     By the way, conventionally, it has been known to provide a shielding plate near an energization pin of a plating jig in order to suppress a plated metal layer thickness of a portion at which the energization pin for energizing a wafer is arranged from becoming thick in forming a plated layer on the wafer (refer to Patent Literature 1). 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Patent Laid-Open No. 11-193499 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, the invention described in Japanese Patent Laid-Open No. 11-193499 suppresses the metal layer thickness of the portion at which the energization pin whose position has been fixed is arranged. In other words, the invention described in Japanese Patent Laid-Open No. 11-193499 does not suppress bump heights and wiring thicknesses in a substrate surface, in a case where a position of the portion in which patterns are not formed on a resist, i.e., a position of the portion in which the bump heights and the wiring thicknesses are large, is changed, depending on a type of the substrate or a direction of the substrate arranged at the plating jig. 
     The present invention has been made in view of the above-described problem, and an object thereof is to suppress thicknesses of a plating film of dies adjacent to a portion in which patterns are not formed on a resist, and to improve the uniformity of a plated metal layer thickness on a substrate. 
     Solution to Problem 
     One mode of a substrate holder of the present invention is a substrate holder for holding a substrate, and the substrate holder has: a substrate holding surface for placing and holding the substrate; a substrate holding part configured to have an edge that forms an opening part for exposing the substrate placed on the substrate holding surface, and to press the substrate against the substrate holding surface to thereby hold the substrate; and a shielding part configured to be arranged at the substrate holding part, protrude to an inside of the opening part of the substrate holding part in a radial direction, and to shield a part of the substrate, in which the shielding part is configured to be movable along the edge. 
     In one mode of the substrate holder of the present invention, the shielding part is configured to be movable in the radial direction of the opening part. 
     In one mode of the substrate holder of the present invention, the shielding part has a protruding part that protrudes toward the substrate holding surface. 
     In one mode of the substrate holder of the present invention, the protruding part has a tapered surface in a surface on the inside in the radial direction of the opening part, a thickness of the tapered surface becoming smaller toward the substrate holding surface. 
     In one mode of the substrate holder of the present invention, the substrate holding part has a groove formed along the edge of the opening part, the shielding part has an engagement part that engages with the groove, and the shielding part is configured to be movable along the edge of the opening part by the engagement part sliding along the groove. 
     One mode of a plating apparatus of the present invention is a plating apparatus including the above-described substrate holder, and the plating apparatus has a shielding part moving mechanism for moving the shielding part along the edge of the opening part. 
     One mode of a method for holding a substrate by a substrate holder of the present invention has the steps of: placing the substrate between a substrate holding surface and a substrate holding part of the substrate holder, and pressing the substrate against the substrate holding surface by the substrate holding part while exposing the substrate to thereby hold the substrate; and moving along an edge of an opening part a shielding part that protrudes to an inside of an opening part of the substrate holding part in a radial direction and shields a part of the substrate placed on the substrate holding surface. 
     One mode of a plating apparatus of the present invention is a plating apparatus that plates a substrate, and the plating apparatus includes: a plating bath configured to house the substrate and an anode; and an intermediate mask arranged between the substrate and the anode, in which the intermediate mask has a plurality of edge parts that form an opening through which an electric field from the anode to the substrate is made to pass, and in which the plating apparatus has a drive mechanism that moves a position of an inner part of each of the edge parts in a radial direction of the opening. 
     One mode of a plating apparatus of the present invention is a plating apparatus that plates a substrate, and the plating apparatus includes: a plating bath configured to house the substrate and an anode; and an intermediate mask arranged between the substrate and the anode, in which the intermediate mask has a plurality of edge parts that form an opening through which an electric field from the anode to the substrate is made to pass, and in which the plating apparatus has a drive mechanism that moves each of the edge parts in a direction toward the substrate. 
     Advantageous Effects of Invention 
     According to the present invention, thicknesses of a plated metal layer of dies adjacent to a portion in which patterns are not formed on a resist can be suppressed, and the uniformity of the plated metal layer thickness on a substrate can be improved. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an overall arrangement view of a plating apparatus including a substrate holder according to the embodiment; 
         FIG. 2  is a schematic elevational view of the substrate holder according to the embodiment used in a plating apparatus; 
         FIG. 3  is a cross-sectional view in an XX cross section of the substrate holder of  FIG. 2 ; 
         FIG. 4  is a cross-sectional view showing an example of the other mode of a shielding plate; 
         FIG. 5  is a cross-sectional view showing an example of the other mode of the shielding plate; 
         FIG. 6  is a cross-sectional view showing an example of the other mode of the shielding plate; 
         FIG. 7  is a schematic side view of a substrate holder attaching/detaching device; 
         FIG. 8  is a cross-sectional view showing an example of a still other mode of the shielding plate; 
         FIG. 9  is a plan view of the shielding plate of  FIG. 8 ; 
         FIG. 10  is a schematic side cross-sectional view of a copper plating unit; 
         FIG. 11  is a schematic elevational view of an intermediate mask shown in  FIG. 10 ; 
         FIG. 12  is a schematic elevational view of an intermediate mask of the other mode; 
         FIG. 13  is one example of a schematic cross-sectional view of an edge part in a YY cross section of the intermediate mask of  FIG. 12 ; 
         FIG. 14  is another example of a schematic cross-sectional view of the edge part in the YY cross section of the intermediate mask of  FIG. 12 ; 
         FIG. 15  is a schematic elevational view of an intermediate mask of a still other mode; 
         FIG. 16  is a schematic cross-sectional view of an edge part in a ZZ cross section of the intermediate mask of  FIG. 15 ; 
         FIG. 17  is a schematic elevational view of an intermediate mask of a yet still other mode; 
         FIG. 18  is an enlarged cross-sectional view of an edge part of the intermediate mask of  FIG. 17 ; 
         FIG. 19  is a schematic plan view of a substrate used for Example 1; 
         FIG. 20  is a graph showing a measurement result of Example 1; 
         FIG. 21  is a graph showing a measurement result of Comparative example 1; 
         FIG. 22  is a schematic plan view of a substrate used for Example 2; 
         FIG. 23  is a graph showing a measurement result of Example 2; and 
         FIG. 24  is a graph showing a measurement result of Comparative example 2. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, an embodiment of the present invention will be explained with reference to drawings. In the drawings explained below, the same symbols are attached to the same or corresponding components, and overlapping explanation thereof is omitted. 
       FIG. 1  is an overall arrangement view of a plating apparatus including a substrate holder according to the embodiment. As shown in  FIG. 1 , a plating apparatus  25  includes: two cassette tables  27  each having a cassette  26  mounted thereon, the cassette  26  storing a substrate, such as a semiconductor wafer; an aligner  28  that aligns positions of an orientation flat and a notch of the substrate in a predetermined direction; a substrate attaching/detaching part  30  that attaches the substrate to a placed substrate holder  50  and detaches the substrate from the placed substrate holder  50 ; and a spin dryer  29  that rotates the substrate after plating treatment at a high speed to thereby dry it. A plating apparatus  25  further includes a transportation robot in a center of these units, such as a substrate transporting device  31 , which transports the substrate among the above-described units. 
     The substrate attaching/detaching part  30  includes a flat plate-shaped placement plate  33  that is slidable in a horizontal direction along a rail  32 . The substrate transporting device  31  performs delivery of the substrate with one of the two substrate holders  50  placed on the placement plate  33  in a horizontal state. After that, the substrate transporting device  31  slides the placement plate  33  in the horizontal direction, and performs delivery of the substrate with the other substrate holder  50 . 
     In addition, in the plating apparatus  25 , there are arranged: a stocker  34  for storing and temporarily placing the substrate holders  50 ; a pre-wet bath  35  for soaking the substrate in pure water; a pre-soak bath  36  that removes by etching an oxide film of a surface of a seed layer formed on a surface of the substrate; a first washing bath  37   a  that washes the surface of the substrate with the pure water; a blow bath  38  that drains the substrate after cleaning; a second washing bath  37   b ; and a plating part  39 . 
     The plating part  39  includes an overflow bath  40 , and a plurality of copper plating units  41  stored inside the overflow bath  40 . Each copper plating unit  41  stores the substrate holder  50  holding the substrate inside it, and performs plating treatment, such as copper plating. Note that although the copper plating is explained in this example, the similar plating apparatus  25  can be used also in plating of nickel, solder, silver, gold, etc. 
     Further, the plating apparatus  25  further includes a substrate holder transporting device  42  that transports the substrate holder  50  together with the substrate. The substrate holder transporting device  42 , for example, employs a linear motor system, and is located on a side of the substrate attaching/detaching part  30  and the above-described each bath. The substrate holder transporting device  42  has: a first transporter  43  that transports the substrate between the substrate attaching/detaching part  30  and the stocker  34 ; and a second transporter  44  that transports the substrate among the stocker  34 , the pre-wet bath  35 , the pre-soak bath  36 , the washing baths  37   a  and  37   b , the blow bath  38 , and the plating part  39 . Note that the substrate holder transporting device  42  may include only the first transporter  43  without including the second transporter  44 . 
     In addition, on a side of the overflow bath  40  of the substrate holder transporting device  42 , there is arranged a paddle driving device  46  that drives a paddle (not shown) that is located inside each copper plating unit  41  and stirs a plating liquid. 
     &lt;Substrate Holder&gt; 
       FIG. 2  is a schematic elevational view of the substrate holder  50  according to the embodiment used in the plating apparatus  25  shown in  FIG. 1 , and  FIG. 3  is a cross-sectional view in an XX cross section of the substrate holder shown in  FIG. 2 . The substrate holder  50 , as shown in  FIG. 2 , for example, has: a rectangular flat plate-shaped first holding member  54  made of vinyl chloride; and a second holding member  60  (a substrate holding part) openably attached to the first holding member  54  with a hinge  56 . A holding surface  57  (a substrate holding surface) for placing and holding the substrate is provided substantially in a center of the first holding member  54  of the substrate holder  50 . The second holding member  60  has an edge  63   a  that forms an opening part  63  for exposing the substrate placed on the holding surface  57 . 
     A pair of substantially T-shaped hands  52  that serves as support parts when the substrate holder  50  is transported, and hung and supported is coupled to an upper end of the first holding member  54  of the substrate holder  50 . The substrate holder  50  is vertically hung and supported by hooking the hands  52  on an upper surface of a peripheral wall of the stocker  34  in the stocker  34  shown in  FIG. 1 . In addition, the hands  52  of the hung and supported substrate holder  50  are gripped by the first transporter  43  or the second transporter  44  of the substrate holder transporting device  42 , and then the substrate holder  50  is transported. Note that also in the pre-wet bath  35 , the pre-soak bath  36 , the washing baths  37   a  and  37   b , the blow bath  38 , and the plating part  39 , the substrate holder  50  is hung on and supported by peripheral walls of the baths through the hands  52 . 
     The second holding member  60  includes a base  58  fixed to the hinge  56 , and a ring-shaped seal holder  62  fixed to the base  58 . When the substrate is held, first, the substrate is placed on the holding surface  57  of the first holding member  54  in a state where the second holding member  60  is opened, and the second holding member  60  is closed through the hinge  56 . Subsequently, a not-shown ring-shaped pressing part is rotated clockwise, the pressing part is made to engage with a not-shown clamper etc., and the second holding member  60  is tightened to the first holding member  54  to then be locked. When the first holding member  54  and the second holding member  60  are locked, the second holding member  60  presses an outer periphery of the substrate placed on the holding surface  57  against the holding surface  57 , and holds the substrate. 
     When holding of the substrate is released, the not-shown ring-shaped pressing part is rotated counterclockwise in a state where the first holding member  54  and the second holding member  60  are locked. Hereby, engagement of the not-shown pressing part and the not-shown clamper is released, and holding of the substrate is released. 
     In addition, as shown in  FIG. 2 , on the seal holder  62  of the second holding member  60 , the substrate holder  50  has a shielding plate  65  (i.e., a shielding part) that protrudes to an inside of the opening part  63  in a radial direction, and that shields a part of the substrate placed on the holding surface  57 . The shielding plate  65  is a substantially rectangular plate, and includes synthetic resin, such as vinyl chloride, resin, and VITON®. Note that a material of the shielding plate  65  is not limited to synthetic resin, and that other dielectrics can also be used. 
     A substrate W is placed on the holding surface  57  as shown in  FIG. 3 . An upper surface of the substrate W is pressed by a seal  68  held by the seal holder  62 . Hereby, the substrate W is held by the substrate holder  50 . A distance between an inner peripheral surface of the seal  68  and an outer edge (i.e., an end) of the substrate W is, for example, 1 to 3 mm. The substrate holder  50  has a power supply terminal  69  for supplying electric power to a conductive layer formed on a surface of the substrate W. The power supply terminal  69  comes into contact with an outer periphery of the substrate W to supply electric power to the substrate W in a space sealed by the seal  68 . 
     As shown in  FIGS. 2 and 3 , the seal holder  62  has an annular groove  66  formed in an upper surface thereof along the edge  63   a  of the opening part  63 . The groove  66  is located on the seal holder  62  so as to be a concentric circle of the substrate W. The shielding plate  65  has a projecting part  67  (i.e., an engagement part) that engages with the groove  66 . The projected part  67  engages with the groove  66 , and thereby the shielding plate  65  is fixed to an arbitrary position on the seal holder  62 . In addition, the shielding plate  65  is configured to be movable along the edge  63   a  of the opening part  63  by the projected part  67  sliding along the groove  66 . Accordingly, the shielding plate  65  is configured to be movable on the concentric circle of the substrate W. Note that although the one shielding plate  65  is provided at the substrate holder  50  shown in  FIG. 2 , the present invention is not limited to this, and two or more shielding plates  65  may be provided at the substrate holder  50 . 
     The shielding plate  65  protrudes to the inside of the opening part  63  in the radial direction, and shields a part of the substrate W placed on the holding surface  57 , whereby a part of an electric field applied to the substrate W in electrolytic plating is shielded. Hereby, in a portion of the substrate W covered with the shielding plate  65 , a thickness of a plated metal layer to be formed becomes thinner compared with that of the other portion. Note that the shielding plate  65  is preferably configured to protrude to the inside of the opening part  63  in the radial direction in a range not less than 0.5 mm and not more than 10 mm from an inner peripheral surface of the seal holder  62 . 
     Next, there will be explained an example of the other mode of the shielding plate  65  provided at the substrate holder  50  according to the embodiment.  FIGS. 4 to 6  are cross-sectional views showing the example of the other mode of the shielding plate  65 . The shielding plate  65  shown in  FIG. 4  has a protruding part  65   a  that protrudes to a holding surface  57  side of the opening part  63  of the seal holder  62 . The protruding part  65   a  is a plate-shaped body provided at an end of the shielding plate  65 . An outer peripheral surface of the protruding part  65   a  (in other words, a surface that faces inner peripheral surfaces of the seal holder  62  and the seal  68 ) is formed to be curved so as to coincide with shapes of the inner peripheral surfaces of the seal holder  62  and the seal  68 . Since the protruding part  65   a  reduces a distance (i.e., an interval) between the substrate W placed on the holding surface  57  and the shielding plate  65 , the thickness of the plating film formed on the portion of the substrate W covered with the shielding plate  65  can be more reduced. 
     The shielding plate  65  shown in  FIG. 5  has the protruding part  65   a  that protrudes to the holding surface  57  side of the opening part  63  of the seal holder  62  similarly to the shielding plate  65  shown in  FIG. 4 . The protruding part  65   a  of the shielding plate  65  shown in  FIG. 5  has a tapered surface  65   b  in a surface on the inside in the radial direction of the opening part  63 , a thickness of the tapered surface  65   b  becoming smaller toward the holding surface  57 . The protruding part  65   a  has the tapered surface  65   b  as described above, and thereby bubbles can be suppressed from remaining in a boundary portion of the protruding part  65   a , and the seal holder  62  and the seal  68 . In addition, since a plating liquid can also be suppressed from remaining in the boundary portion, cleaning of the substrate holder  50  becomes easy. 
     The shielding plate  65  shown in  FIG. 6  has the protruding part  65   a  that protrudes to the holding surface  57  side of the opening part  63  of the seal holder  62  similarly to the shielding plates  65  shown in  FIGS. 4 and 5 . The protruding part  65   a  of the shielding plate  65  shown in  FIG. 6  has a curved tapered surface  65   c  in a surface on the inside in the radial direction of the opening part  63 , a thickness of the curved tapered surface  65   c  becoming smaller toward the holding surface  57 . The protruding part  65   a  has the curved tapered surface  65   c  as described above, and thereby bubbles can be suppressed from remaining in a boundary portion of the protruding part  65   a , and the seal holder  62  and the seal  68 . In addition, since a plating liquid can also be suppressed from remaining in the boundary portion, cleaning of the substrate holder  50  becomes easy. 
     Next, a device and a method for moving the shielding plate  65  along the opening part  63  will be explained.  FIG. 7  is a schematic side view of a substrate holder attaching/detaching device. A substrate holder attaching/detaching device  300  (a shielding part moving mechanism) is provided at the substrate attaching/detaching part  30  shown in  FIG. 1 , and it is the device for locking the second holding member  60  of the substrate holder  50  mainly shown in  FIG. 2  to the first holding member  54  to thereby make the substrate holder  50  hold the substrate. 
     The substrate holder attaching/detaching device  300  has: a shaft  302  configured to be movable and rotatable in an axial direction; a disk  304  fixed to the shaft  302 ; and a disk  306  with a larger diameter than the disk  304  fixed to a lower surface of the disk  304 . A plurality of (for example, two is shown in  FIG. 7 ) holder lock pins  310   a  and  310   b  for rotating a not-shown ring-shaped pressing part of the substrate holder  50  are provided at the lower surface of the disk  304 . 
     At the disk  304 , there are provided: a shielding plate rotating pin  314  for moving the shielding plates  65  shown in  FIGS. 2 to 6  along the edge  63   a  of the opening part  63 ; and an air cylinder  312  for expanding and contracting the shielding plate rotating pin  314 . The shielding plate rotating pin  314  extends penetrating the disk  304  from an upper surface side toward a lower surface side of the disk  304 . When the shielding plate  65  is moved, the air cylinder  312  makes the shielding plate rotating pin  314  protrude downwardly from the lower surface of the disk  304  as shown in  FIG. 7 . Meanwhile, when the holder lock pins  310   a  and  310   b  make the substrate holder  50  lock, the air cylinder  312  stores the shielding plate rotating pin  314  inside a cylinder so that the shielding plate rotating pin  314  does not interfere with locking work. 
     When the substrate holder  50  shown in  FIG. 2  is made to hold the substrate W, first, the substrate holder  50  is arranged under the substrate holder attaching/detaching device  300 , and the substrate W is placed on the holding surface  57 . Subsequently, the outer periphery of the substrate W is pressed by the seal  68  (refer to  FIG. 4  etc.) of the second holding member  60 , while the substrate W placed on the holding surface  57  is exposed from the opening part  63  of the second holding member  60 . The substrate holder attaching/detaching device  300  drives the shaft  302  downwardly, and, for example, inserts the holder lock pins  310   a  and  310   b  in a concave portion etc. formed in an upper surface of the not-shown ring-shaped pressing part of the substrate holder  50 . The shaft  302  of the substrate holder attaching/detaching device  300  rotates in this state, whereby the not-shown pressing part is made to engage with the not-shown clamper etc., and the second holding member  60  is tightened to the first holding member  54  to then be locked. Note that at this time, the shielding plate rotating pin  314  has been stored inside the cylinder of the air cylinder  312 . 
     When the shielding plates  65  shown in  FIGS. 2 to 6  are moved along the opening part  63  of the substrate holder  50 , first, the substrate holder  50  is arranged under the substrate holder attaching/detaching device  300 , and the air cylinder  312  makes the shielding plate rotating pin  314  protrude downwardly from a lower surface of the disk  306 . Subsequently, the substrate holder attaching/detaching device  300  drives the shaft  302  downwardly, and, for example, inserts the shielding plate rotating pin  314  in a not-shown concave portion etc. formed in an upper surface of the shielding plate  65 . The shaft  302  of the substrate holder attaching/detaching device  300  rotates in this state, and thereby the shielding plate  65  moves along the edge  63   a  of the opening part  63 , thus enabling the shielding plate  65  to move to a desired position. 
     Note that although the substrate holder attaching/detaching device  300  shown in  FIG. 7  is configured to have the one shielding plate rotating pin  314 , the substrate holder attaching/detaching device  300  may be configured to have the same number of shielding plate rotating pins  314  as the number of shielding plates  65  in a case where the substrate holder  50  shown in  FIG. 2  has the plurality of shielding plates  65 . 
     Next, there will be explained an example of a still other mode of the shielding plate  65  provided at the substrate holder  50  according to the embodiment.  FIG. 8  is a cross-sectional view showing the example of the still other mode of the shielding plate  65 , and  FIG. 9  is a plan view of the shielding plate  65  of  FIG. 8 . While the shielding plates  65  shown in  FIGS. 2 to 6  are configured to be movable only in a peripheral direction along the edge  63   a  of the opening part  63  of the seal holder  62 , the shielding plate  65  shown in  FIGS. 8 and 9  is configured to be movable also in a radial direction of the opening part  63  of the seal holder  62 . 
     As shown in  FIG. 8 , the shielding plate  65  is a plate-shaped body that protrudes to an inside of the opening part  63  in the radial direction, and covers (shields) a part of the holding surface  57 . As shown in  FIG. 9 , the shielding plate  65  has one or more (for example, two is shown in  FIG. 2 ) elongated holes  65   d , and the elongated hole  65   d  is formed so that a longitudinal direction thereof coincides with the radial direction of the opening part  63 . 
     As shown in  FIG. 8 , a peripheral-direction moving member  70  having an L-shaped cross section is attached to the seal holder  62 . The shielding plate  65  is fixed to an upper surface of the peripheral-direction moving member  70  by fixing means  75 , such as a screw, through the elongated hole  65   d . The shielding plate  65  can move in the radial direction of the opening part  63  along the elongated hole  65   d  by loosening the fixing means  75 . The shielding plate  65  is preferably fixed to the peripheral-direction moving member  70  so as to protrude to the inside of the opening part  63  in the radial direction in a range not less than 0.5 mm and not more than 10 mm from an inner peripheral surface of the seal holder  62 . 
     The peripheral-direction moving member  70  has a projecting part  70   a  (i.e., an engagement part) that engages with the annular groove  66  formed in an upper surface of the seal holder  62 . In addition, in this example, the seal holder  62  has a groove  71  provided along an outer peripheral surface thereof, and the peripheral-direction moving member  70  is fixed to the seal holder  62  by fixing means  72 , such as a set screw whose tip is screwed into the groove  71 . The peripheral-direction moving member  70  is configured to be movable along the edge  63   a  of the opening part  63  by the projecting part  70   a  sliding along the groove  66  in a state where the fixing means  72  is loosened. Accordingly, the shielding plate  65  is configured to be movable along the edge  63   a  of the opening part  63  together with the peripheral-direction moving member  70 . In addition, the peripheral-direction moving member  70  is fixed to a predetermined position by fastening the fixing means  72 , after being arranged at the predetermined position. Accordingly, the shielding plate  65  is included in a shielding member that can move in the radial direction of the opening part  63  together with the peripheral-direction moving member  70 , and can move along the edge  63   a  of the opening part  63 . Note that the shielding plate  65  may have the protruding part  65   a  shown in  FIGS. 4 to 6  at a tip thereof. 
     As explained in the above, since the substrate holder  50  in the embodiment has the shielding plate  65  configured to be movable along the edge  63   a  of the opening part  63 , the shielding plate  65  can be positioned near a portion (for example, dies adjacent to a portion in which patterns are not formed on a resist) on the substrate W in which a plated metal layer thickness is desired to be thin. Hereby, the thickness of the plated metal layer of the portion on the substrate W in which the plated metal layer thickness is desired to be thin can be suppressed, and eventually, in-surface uniformity of the plated metal layer thickness of the substrate W can be improved. Note that in the embodiment, the shielding plate  65  can be moved to an appropriate position by manually or by the substrate holder attaching/detaching device  300  for each substrate W to be treated. Meanwhile, a position of the shielding plate  65  in the peripheral direction is previously registered in a not-shown control device of the plating apparatus  25 , whereby a position on the substrate W to be shielded is read by the aligner  28 , and the substrate W can also be placed on the substrate holder  50  while the position on the substrate W to be shielded is aligned to the position of the shielding plate  65 . 
     In addition, in the substrate holder  50  in the embodiment, since the shielding plate  65  is configured to be movable in the radial direction of the opening part  63 , an area in which the shielding plate  65  covers (or shields) the substrate W placed on the holding surface  57  can be adjusted. For this reason, since a shielding amount of the electric field applied to the substrate W in electrolytic plating can be adjusted, a region on the substrate W in which the plated metal layer thickness is made thin can be adjusted, and the plated metal layer thickness can be appropriately adjusted according a type of the substrate W. 
     &lt;Intermediate Mask&gt; 
     Next, there will be explained a plating bath including an intermediate mask that can suppress the thickness of the plated metal layer of the portion on the substrate W in which the plated metal layer thickness is desired to be thin.  FIG. 10  is a schematic side cross-sectional view of the copper plating unit  41  shown in  FIG. 1 , and  FIG. 11  is a schematic elevational view of the intermediate mask shown in  FIG. 10 . 
     As shown in  FIG. 10 , the copper plating unit  41  has: a plating bath  80  configured to house the substrate holder  50  that holds the substrate W, and an anode holder  82  that holds an anode  82   a ; a plating power source  84  that applies voltage to the substrate W and the anode  82   a ; an intermediate mask  85  arranged between the substrate W and the anode  82   a ; and a paddle  83  for stirring a plating liquid, the paddle  83  being arranged between the substrate W and the intermediate mask  85 . 
     The intermediate mask  85  is a plate-shaped member, and has an edge part  86  that forms an opening  87  through which an electric field from the anode  82   a  to the substrate W is made to pass. In other words, the edge part  86  shields a part of the electric field from the anode  82   a  to the substrate W. As shown in  FIG. 11 , the edge part  86  is formed in a substantially annular shape as a whole. The edge part  86  is configured to be divided in a peripheral direction, and has one or more edge parts  86   a  (first edge parts, and they are six in  FIG. 11 ) and one or more edge parts  86   b  (second edge parts, and they are two in  FIG. 11 ). A distance R 2  from an inner periphery of the edge part  86   b  to a center O of the opening  87  is smaller than a distance R 1  from an inner periphery of the edge part  86   a  to the center O of the opening  87 . Hereby, an electric field from the anode  82   a  to the substrate W shielded by the edge part  86   b  is larger than an electric field from the anode  82   a  to the substrate W shielded by the edge part  86   a . Note that the edge part  86   b  is formed to protrude to an inside of the opening  87  in a radial direction with respect to the edge part  86   a  by a length not less than 1 mm and not more than 10 mm. 
     Since the part of the electric field from the anode  82   a  to the substrate W is shielded by the edge part  86   b  that has a relatively short distance to the center of the opening  87 , a thickness of a plating film formed on a part on the substrate W shielded by the edge part  86   b  is thin compared with that of the other portion. Accordingly, the edge part  86   b  is provided at the intermediate mask  85  so that the edge part  86   b  shields a part of the electric field applied to the portion on the substrate W in which the plating film thickness is desired to be thin, whereby the thickness of the plating film of the portion on the substrate W in which the plating film thickness is desired to be thin can be suppressed, and eventually, in-surface uniformity of the metal layer thickness of the substrate W can be improved. 
     Next, the intermediate mask  85  of the other mode according to the present invention will be explained.  FIG. 12  is a schematic elevational view of the intermediate mask  85  of the other mode,  FIG. 13  is one example of a schematic cross-sectional view of an edge part in a YY cross section of the intermediate mask  85  shown in  FIG. 12 , and  FIG. 14  is another example of a schematic cross-sectional view of the edge part in the YY cross section of the intermediate mask  85  shown in  FIG. 12 . 
     As shown in  FIG. 12 , the edge part  86  that forms the opening  87  of the intermediate mask  85  is configured to be divided in a peripheral direction, and has the one or more edge parts  86   a  (first edge parts, and they are six in  FIG. 12 ) and one or more edge parts  86   c  (second edge parts, and they are two in  FIG. 12 ). A distance from an inner periphery of the edge part  86   a  of the intermediate mask  85  to the center O of the opening  87  shown in  FIG. 12  is the same as a distance from an inner periphery of the edge part  86   c  to the center O of the opening  87 . Meanwhile, as shown in  FIG. 13 , a thickness of the edge part  86   c  is formed to be thicker than a thickness of the edge part  86   a , for example, in a range not less than 1 mm and not more than 5 mm. In other words, a distance from the edge part  86   c  to the substrate W is smaller than a distance from the edge part  86   a  to the substrate W in a state where the intermediate mask  85  is arranged in the plating bath  80  shown in  FIG. 10 . Hereby, since the distance (or an interval) between the substrate W and the edge part  86   c  becomes smaller than the distance between the substrate W and the edge part  86   a , a thickness of a metal layer formed on a portion of the substrate W shielded by the edge part  86   c  is thin compared with that of the other portion. Accordingly, the edge part  86   c  is provided at the intermediate mask  85  so that the edge part  86   c  shields a part of an electric field applied to a portion on the substrate W in which the plated metal layer thickness is desired to be thin, whereby the thickness of the plated metal layer of the portion on the substrate W in which the plated metal layer thickness is desired to be thin can be suppressed, and eventually, in-surface uniformity of the metal layer thickness of the substrate W can be improved. 
     Note that although a thickness of the edge part  86   c  of the intermediate mask  85  shown in  FIG. 13  is uniform as a whole, the edge part  86   c  may be configured so that a cross-sectional shape of the edge part  86   c  of the intermediate mask  85  becomes a mountain shape toward a center as shown in  FIG. 14 . In addition, although in the intermediate mask  85  shown in  FIG. 12 , the distance from the inner periphery of the edge part  86   a  to the center O of the opening  87  is the same as the distance from the inner periphery of the edge part  86   c  to the center O of the opening  87 , similarly to the intermediate mask  85  shown in  FIG. 11 , the intermediate mask  85  shown in  FIG. 12  can also be configured so that the distance from the inner periphery of the edge part  86   a  to the center O of the opening  87  is different from the distance from the inner periphery of the edge part  86   c  to the center O of the opening  87 . 
       FIG. 15  is a schematic elevational view of the intermediate mask  85  of a still other mode, and  FIG. 16  is a schematic cross-sectional view of an edge part in a ZZ cross section of the intermediate mask shown in  FIG. 15 . As shown in  FIG. 15 , the edge part  86  that forms the opening  87  of the intermediate mask  85  is divided in a peripheral direction, and includes a plurality of edge parts  86   d . The plurality of edge parts  86   d  are configured to be movable in a radial direction of the opening  87 . In addition, the plurality of edge parts  86   d  are configured to be movable to the substrate W in a state where the intermediate mask  85  is arranged in the plating bath  80  shown in  FIG. 10 . 
     The intermediate mask  85  further includes air bags  91  (i.e., drive mechanisms) corresponding to the respective edge parts  86   d  at an outside of the edge part  86  in a radial direction. The air bag  91  is configured to be able to be expanded and contracted by an air controller  90 . When an inside of the air bag  91  is pressurized by the air controller  90 , the air bag  91  expands to come into contact with the edge part  86   d , and moves the edge part  86   d  to an inside of the opening  87  in a radial direction. When the air controller  90  returns a pressure of the inside of the air bag  91  to atmospheric pressure, the air bag  91  is contracted by an elastic force of the air bag  91  and a water pressure of a plating liquid. Simultaneously with this, the edge part  86   d  is moved to an original position by biasing means, such as a not-shown spring. Namely, the air bag  91  can move a position of an inner part  86   e  of the edge part  86   d  in the radial direction of the opening  87 . The edge part  86   d  is moved toward the inside of the opening  87  in the radial direction by the air bag  91 , for example, in a range not less than 1 mm and not more than 10 mm. Hereby, the edge part  86   d  moved to the inside of the opening  87  in the radial direction is included in a second edge part that shields the electric field from the anode  82   a  to the substrate W shown in  FIG. 10  more than the other edge part  86   d  (or a first edge part). Note that the edge part  86   d  and the air bag  91  may be partially combined to directly move the edge part  86   d  by expansion and contraction of the air bag  91 . 
     As shown in  FIG. 16 , the intermediate mask  85  includes air bags  92  (or drive mechanisms) corresponding to the respective edge parts  86   d  on a back surface side of the intermediate mask  85  (or an anode  82   a  side in the intermediate mask  85  shown in  FIG. 10 ). The air bag  92  is configured to be able to be expanded and contracted by the air controller  90  shown in  FIG. 15 . When an inside of the air bag  92  is pressurized by the air controller  90 , the air bag  92  expands to come into contact with the edge part  86   d , and moves the edge part  86   d  to a front surface side (or a substrate W side in the intermediate mask  85  shown in  FIG. 10 ) of the opening  87 . When the air controller  90  returns a pressure of the inside of the air bag  92  to atmospheric pressure, the air bag  92  is contracted by an elastic force of the air bag  92  and a water pressure of a plating liquid. Simultaneously with this, the edge part  86   d  is moved to an original position of the intermediate mask  85  by biasing means, such as a not-shown spring. The edge part  86   d  moved to the substrate W shown in  FIG. 10  by the air bag  92  is included in a second edge part that shields the electric field from the anode  82   a  to the substrate W more than the other edge part  86   d  (or a first edge part). 
     As explained in the above, in the intermediate mask  85  shown in  FIGS. 15 and 16 , the edge part  86  is configured to be divided, and the divided respective edge parts  86   d  are configured to be movable in the radial direction of the opening  87  by the air bags  91 . Accordingly, the edge part  86   d  corresponding to the portion (for example, dies adjacent to a portion in which patterns are not formed on a resist) on the substrate W in which the plated metal layer thickness is desired to be thin can be moved to the inside in the radial direction. Hereby, since the portion on the substrate W in which the plated metal layer thickness is desired to be thin is partially covered with the edge part  86   d , the thickness of the plating film of the portion on the substrate W in which the plated metal layer thickness is desired to be thin can be suppressed, and eventually, in-surface uniformity of the metal layer thickness of the substrate W can be improved. In addition, according to the intermediate mask  85 , an area (an area that overlaps with the substrate W) in which the edge part  86   d  covers (shields) the substrate W can be adjusted. For this reason, since a shielding amount of the electric field applied to the substrate W in electrolytic plating can be adjusted, a region on the substrate W in which the plated metal layer thickness is made thin can be adjusted, and the plated metal layer thickness can be appropriately adjusted according to a type of the substrate W. 
     In addition, in the intermediate mask  85  shown in  FIGS. 15 and 16 , the edge part  86  is configured to be divided, and the divided respective edge parts  86   d  are configured to be movable to the substrate W shown in  FIG. 10  by the air bags  92 . Accordingly, the edge part  86   d  corresponding to the portion (for example, the dies adjacent to the portion in which the patterns are not formed on the resist) on the substrate W in which the plated metal layer thickness is desired to be thin can be moved to a side near the substrate W. Hereby, since a distance between the portion on the substrate W in which the plated metal layer thickness is desired to be thin and the edge part  86   d  becomes small, the metal layer thickness of the portion on the substrate W in which the plated metal layer thickness is desired to be thin can be made thin compared with that of the other portion, and eventually, in-surface uniformity of the layer thickness of the substrate W can be improved. In addition, according to the intermediate mask  85 , since distances (or intervals) between the respective edge parts  86   d  and the substrate W can be independently adjusted, an amount of the electric field applied to portions of the substrate W corresponding to the respective edge parts  86   d  in electrolytic plating can be adjusted, and the plated metal layer thickness can be appropriately adjusted according the type of the substrate W. 
     Note that although the air bag  91  and the air bag  92  are used in  FIGS. 15 and 16  as the drive mechanisms that move the edge part  86   d , the present invention is not limited to this, and a drive mechanism, such as an actuator, may be used. 
     In addition, although the edge part  86  is configured to be divided into eight in the respective intermediate masks  85  shown in  FIGS. 11 to 16 , the present invention is not limited to this, and the edge part  86  may just be divided into not less than four and not more than twenty-four. This is because selectivity of a shielded region deteriorates if the number of divisions is less than four, and influence of one divided edge part  86  is too small if the number of divisions is not less than twenty-five, which makes adjustment complicated. 
       FIG. 17  is a schematic elevational view of an intermediate mask of a yet still other mode, and  FIG. 18  is an enlarged cross-sectional view of an edge part of the intermediate mask of  FIG. 17 . Unlike the intermediate mask  85  shown in  FIG. 15 , in the intermediate mask  85  shown in  FIG. 17 , the plurality of edge parts  86   d  themselves include air bags. The edge part  86   d  is configured to be able to be expanded and contracted by the air controller  90  (or the drive mechanism). An outer part  86   f  of the edge part  86   d  is fixed to the intermediate mask  85 . Hereby, when an inside of the edge part  86   d  is pressurized by the air controller  90 , an inner part  86   e  of the edge part  86   d  moves to an inside of the opening  87  in a radial direction. When the air controller  90  returns a pressure of the inside of the edge part  86   d  to atmospheric pressure, the edge part  86   d  is contracted by an elastic force of the edge part  86   d , and a water pressure of a plating liquid. The inner part  86   e  of the edge part  86   d  is configured to be movable toward the inside of the opening  87  in the radial direction, for example, in a range not less than 1 mm and not more than 10 mm. Hereby, the inner part  86   e  of the edge part  86   d  moved to the inside of the opening  87  in the radial direction is included in the second edge part that shields the electric field from the anode  82   a  to the substrate W shown in  FIG. 10  more than the other edge part  86   d  (the first edge part). 
     As shown in  FIG. 18 , the edge part  86   d  has folded parts  86   g  at a surface in which the edge parts  86   d  are adjacent to each other. The folded parts  86   g  are developed by the inside of the edge part  86   d  being pressurized, and the inner part  86   e  of the edge part  86   d  moves toward the inside of the opening  87  in the radial direction. In addition, when a pressure of the inside of the edge part  86   d  is returned to atmospheric pressure, the folded parts  86   g  are folded again, and the inner part  86   e  of the edge part  86   d  moves toward an outside in the radial direction. 
     The intermediate mask  85  shown in  FIGS. 17 and 18  exerts an effect similar to the intermediate mask  85  shown in  FIG. 15 . Note that the intermediate mask  85  shown in  FIGS. 17 and 18  may include the air bags  92  shown in  FIG. 16 . Hereby, the edge part  86   d  can move also to the front surface side (the substrate W side in the intermediate mask  85  shown in  FIG. 10 ) of the opening  87 . 
     Next, a method for plating the substrate by the plating unit  41  shown in  FIG. 10  will be explained. First, the anode  82   a  and the substrate W are stored in the plating bath  80  as shown in  FIG. 10 . At this time, the anode  82   a  and the substrate W are arranged so that respective surfaces thereof face to each other. Subsequently, the intermediate mask  85  is arranged between the anode  82   a  and the substrate W. Namely, the portion (for example, the dies adjacent to the portion in which the patterns are not formed on the resist) on the substrate W in which the plating film thickness is desired to be thin is shielded by the edge part  86   b  (as shown in  FIG. 11 ), the edge part  86   c  (refer to  FIG. 12 ), or the edge part  86   d  (as shown in  FIG. 13 ) of the intermediate masks  85 . 
     In a case of using the intermediate mask  85  of the mode shown in  FIG. 11 , the intermediate mask  85  is arranged so that the edge part  86   b  corresponds to the portion (for example, the dies adjacent to the portion in which the patterns are not formed on the resist) on the substrate W in which the plated metal layer thickness is desired to be thin. Specifically, when the substrate W is seen from the anode  82   a  side, the intermediate mask  85  is arranged so that the edge part  86   b  overlaps with the portion on the substrate W in which the plated metal layer thickness is desired to be thin. Hereby, the portion on the substrate W in which the plated metal layer thickness is desired to be thin is shielded by the edge part  86   b  of the intermediate mask  85 . 
     In addition, in a case of using the intermediate mask  85  of the mode shown in  FIG. 12 , the intermediate mask  85  is arranged so that the edge part  86   c  corresponds to the portion (for example, the dies adjacent to the portion in which the patterns are not formed on the resist) on the substrate W in which the plating film thickness is desired to be thin. Specifically, when the substrate W is seen from the anode  82   a  side, the intermediate mask  85  is arranged so that the edge part  86   c  overlaps with the portion on the substrate W in which the plated metal layer thickness is desired to be thin. Hereby, the part of the electric field applied to the portion on the substrate W in which the plated metal layer thickness is desired to be thin is shielded by the edge part  86   c  of the intermediate mask  85 . 
     Further, in a case of using the intermediate mask  85  of the mode shown in  FIG. 15 , the edge part  86   d  corresponding to the portion (for example, the dies adjacent to the portion in which the patterns are not formed on the resist) on the substrate W in which the plated metal layer thickness is desired to be thin is moved to the inside of the opening  87  in the radial direction by the air bag  91 , and/or is moved to the side near the substrate W by the air bag  92 . Hereby, the part of the electric field applied to the portion on the substrate W in which the plated metal layer thickness is desired to be thin is shielded by the edge part  86   d  of the intermediate mask  85  moved by the air bag  91  and/or the air bag  92 . 
     Subsequently, the plating power source  84  applies an electric field between the anode  82   a  and the substrate W. At this time, the edge part  86   a  of any of the intermediate masks  85  shown in  FIGS. 11 to 13  shields the electric field, and the edge part  86   b  shown in  FIG. 11 , the edge part  86   c  shown in  FIG. 12 , or the edge part  86   d  shown in  FIG. 13  shields the electric field more than the edge part  86   a . Hereby, the metal layer thickness of the portion on the substrate W in which the plated metal layer thickness is desired to be thin can be made thin compared with that of the other portion, and eventually, in-surface uniformity of the metal layer thickness of the substrate W can be improved. 
     Example 1 
     Hereinafter, the present invention will be explained in detail using Examples.  FIG. 19  is a schematic plan view of a substrate used for Example 1. In Example 1, a resist layer with a thickness of 100 μm was formed on the substrate W including a silicon wafer, and a plurality of resist opening parts  95  each with a diameter of 100 μm were formed on the resist layer by a photolithography method. A portion  97  in which resist opening patterns were not formed was provided around a notch  96  of the substrate W. The substrate W was installed at the substrate holder  50  that has the shielding plate  65  shown in  FIG. 2  etc. A tip of the shielding plate  65  at this time was configured to protrude from the inner peripheral surface of the seal holder  62  to the inside of the opening part  63  in the radial direction by 2 mm. The shielding plate  65  was moved on the seal holder  62  to coincide with the portion  97  around the notch  96  in which the resist opening patterns were not formed, and was fixed to the seal holder  62 . The substrate W was housed in a plating bath in which a conventional intermediate mask in which an edge part was not divided was installed, and electroplating was performed so that a plating height of a resist opening part was 50 μm. Bump heights in dies of the electroplated substrate W were measured from the notch  96  to an opposite end of the substrate W toward a counter-notch direction (i.e., a direction from the notch  96  toward the center of the substrate W) as shown by an arrow  98  of  FIG. 19 . 
     As Comparative Example 1, electroplating was performed to the substrate W on the same conditions as Example 1 except for using a substrate holder in which the shielding plate  65  was not provided. Similarly, bump heights in dies of the substrate W were measured from the notch  96  to the opposite end of the substrate W toward the counter-notch direction as shown in the arrow  98  of  FIG. 19 . 
       FIG. 20  is a graph showing a measurement result of Example 1, and  FIG. 21  is a graph showing a measurement result of Comparative example 1. In the graphs of  FIGS. 20 and 21 , a horizontal axis indicates a distance (mm) from the substrate center, and a vertical axis indicates a plating height (μm), meaning a thickness (μm) of plated metal layer at the designated point. As shown in  FIG. 21 , in the measurement result of Comparative example 1, a plating height of the portion  97  of the substrate W in which the resist opening patterns are not formed is high compared with those of the other portions. In contrast with this, as shown in  FIG. 20 , in Example 1, it turns out that the shielding plate  65  shields the portion  97  in which the resist opening patterns are not formed, thereby the plating height of the portion  97  in which the resist opening patterns are not formed can be suppressed, and that a plating film is formed so that the uniformity of the plated metal layer is formed as a whole. 
     Example 2 
       FIG. 22  is a schematic plan view of a substrate used for Example 2. In Example 2, a resist layer with a thickness of 100 μm was formed on the substrate W including a silicon wafer, and a plurality of resist opening parts  95  each with a diameter of 100 μm were formed on the resist layer by a photolithography method. As shown in  FIG. 22 , the substrate W has the portions  97  in which the resist opening patterns are not formed at positions of 90° and −90° when a position of the notch  96  is set to be 0°. The substrate W was installed at a conventional substrate holder not including the shielding plate  65 . The intermediate mask  85  in which the edge part  86  shown in  FIG. 11  was divided into the edge parts  86   a  and the edge parts  86   b  was housed in a plating bath in which the substrate W was treated. The edge parts  86   b  of the intermediate mask  85  were configured to protrude to the inside of the opening  87  in the radial direction with respect to the edge parts  86   a  by 4 mm, and were arranged to face the portions  97  of the substrate W in which the resist opening patterns were not formed. In the plating bath, electroplating was performed so that a plating height of a resist opening part of the substrate W was 50 μm. Bump heights in dies of the electroplated substrate W were measured from the one portion  97  in which the resist opening patterns were not formed to the other portion  97  in which the resist opening patterns were not formed, as shown in the arrow  98  of  FIG. 22 . 
     As Comparative example 2, electroplating was performed to the substrate W on the same conditions as in Example 2 except for using a conventional intermediate mask in which an edge part was not divided, instead of the intermediate mask  85  shown in  FIG. 11 . Similarly, bump heights in dies of the substrate W were measured from the one portion  97  in which the resist opening patterns were not formed to the other portion  97  in which the resist opening patterns were not formed, as shown in the arrow  98  of  FIG. 22 . 
       FIG. 23  is a graph showing a measurement result of Example 2, and  FIG. 24  is a graph showing a measurement result of Comparative example 2. In the graphs of  FIGS. 23 and 24 , a horizontal axis indicates a distance (mm) from the substrate center, and a vertical axis indicates a plating height (μm). As shown in  FIG. 24 , in the measurement result of Comparative example 2, plating heights of the portions  97  of the substrate W in which the resist opening patterns are not formed are high compared with those of the other portions. In contrast with this, as shown in  FIG. 23 , in Example 2, it turns out that the edge parts  86   b  of the intermediate mask  85  shield the portions  97  in which the resist opening patterns are not formed, thereby the plating heights of the portions  97  in which the resist opening patterns are not formed can be suppressed, and that a plated metal layer is formed so that the plating height is uniform as a whole. 
     Table 1 shows uniformity of the bump heights formed on the substrate W in Example 1, Example 2, Comparative example 1, and Comparative example 2. Note that the uniformity of the bump height is a value obtained by calculating a formula of (a maximum height of the formed bumps−a minimum height of the formed bumps)/(an average value of the bump heights×2)×100. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 Plating condition 
                 Uniformity of bump height 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 Example 1 
                 3.9% 
               
               
                   
                 Example 2 
                 3.5% 
               
               
                   
                 Comparative example 1 
                 25.2% 
               
               
                   
                 Comparative example 2 
                 14.1% 
               
               
                   
                   
               
            
           
         
       
     
     As shown in Table 1, in Example 1 that uses the substrate holder  50  having the shielding plate  65 , since the heights of the bumps close to the portion  97  in which the resist opening patterns are not formed are suppressed, good uniformity is obtained. Meanwhile, in Comparative example 1 that uses the conventional substrate holder without the shielding plate  65 , the heights of the bumps close to the portion  97  in which the resist opening patterns are not formed become high, and uniformity is bad, or not acceptable. 
     In addition, in Example 2 that uses the intermediate mask  85  having the divided edge part  86 , since the heights of the bumps close to the portions  97  in which the resist opening patterns are not formed are suppressed, good (or acceptable) uniformity is obtained. Meanwhile, in Comparative example 2 that uses the conventional intermediate mask in which the edge part is not divided, the heights of the bumps close to the portions  97  in which the resist opening patterns are not formed become high, and uniformity is bad, or not acceptable. 
     Hereinbefore, although the embodiment of the present invention has been explained, the above-mentioned embodiment of the present invention is for facilitating understanding of the present invention, and it does not limit the present invention. It is needless to say that the present invention can be changed and improved without departing from the spirit thereof, and that the equivalents are included in the present invention. In addition, arbitrary combinations or omissions of each component described in claims and the specification can be made in a range that can solve at least a part of the above-mentioned problems, or a range that exerts at least a part of the effects. 
     REFERENCE SIGNS LIST 
     
         
           50  substrate holder 
           60  second holding member 
           63  opening part 
           63   a  edge 
           65  shielding plate 
           65   a  protruding part 
           65   b  tapered surface 
           65   c  curved tapered surface 
           66  groove 
           82   a  anode 
           85  intermediate mask 
           87  opening 
           86 ,  86   a ,  86   b ,  86   c , and  86   d  edge part 
           91  and  92  air bag 
           300  substrate holder attaching/detaching device 
         W substrate