Patent Publication Number: US-2022228286-A1

Title: Short circuit detection method in plating apparatus, control method of plating apparatus, and plating apparatus

Description:
TECHNICAL FIELD 
     The present invention relates to a short circuit detection method in a plating apparatus, a control method of a plating apparatus, and a plating apparatus. 
     BACKGROUND ART 
     In a plating apparatus, a wiring might be short-circuited, for example, due to a chemical solution sticking to the wiring connecting a plating device and a rectifier. In this case, a current cannot flow from the rectifier to a substrate disposed in the plating device, and a problem occurs that the substrate cannot be plated. As a short circuit detection method in the rectifier, for example, such a method as disclosed in PTL 1 is known. 
     CITATION LIST 
     Patent Literature 
     PTL 1: Japanese Patent Laid-Open No. 63-95812 
     SUMMARY OF INVENTION 
     Technical Problem 
     Heretofore, in a plating apparatus, a short circuit has been detected in a state where a substrate is immersed into a plating solution in a plating device. Therefore, it is necessary to discard, as a defective product, the substrate used when detecting the short circuit, and the substrate is wasted. 
     One of objects of the present invention, which has been made in view of the above respects, is to detect a short circuit of a wiring between a rectifier and a plating device in a plating apparatus, without using a substrate in vain. 
     Solution to Problem 
     To solve the aforementioned problems, an aspect of the present invention is a short circuit detection method in a plating apparatus that supplies a current from a rectifier to a substrate to plate the substrate, the short circuit detection method comprising a step of outputting a current with a predetermined current value from the rectifier, in a state where the substrate and a substrate holder holding the substrate are not electrically connected to the rectifier, a step of acquiring an output voltage value of the rectifier, a step of comparing the output voltage value with a predetermined reference voltage value, and a step of determining that a short circuit occurs in a circuit for connecting the rectifier and the substrate, in a case where the output voltage value is lower than the reference voltage value. 
     Further, another aspect of the present invention is the short circuit detection method in the above aspect further comprising a step of determining that the short circuit does not occur in the circuit for connecting the rectifier and the substrate, in a case where the output voltage value is higher than the reference voltage value. 
     Further, another aspect of the present invention is the short circuit detection method in the above aspect, wherein each of the steps is performed before the plating of the substrate is started. 
     Further, another aspect of the present invention is the short circuit detection method in the above aspect, wherein the current with the predetermined current value is a current smaller than the current to be outputted from the rectifier during plating processing of the substrate. 
     Further, another aspect of the present invention is a control method of a plating apparatus that supplies a current from a rectifier to a substrate to plate the substrate, the control method of the plating apparatus comprising a step of outputting, from the rectifier, a current with a current value smaller than that during plating processing, in a state where the substrate and a substrate holder holding the substrate are not electrically connected to the rectifier, a step of acquiring an output voltage value of the rectifier, a step of comparing the output voltage value with a predetermined reference voltage value, a step of determining that a short circuit does not occur in a circuit for connecting the rectifier and the substrate, in a case where the output voltage value is higher than the reference voltage value, a step of determining that the short circuit occurs in the circuit for connecting the rectifier and the substrate, in a case where the output voltage value is lower than the reference voltage value, a step of electrically connecting the substrate and the substrate holder holding the substrate to the rectifier, and performing the plating processing of the substrate, in response to the determination that the short circuit does not occur in the circuit for connecting the rectifier and the substrate, and a step of prohibiting the plating processing of the substrate, in response to the determination that the short circuit occurs in the circuit for connecting the rectifier and the substrate. 
     Further, another further aspect of the present invention is a plating apparatus comprising a plating device for plating a substrate, a rectifier for supplying a current to the substrate, and a control unit, the control unit being configured to output a current with a predetermined current value from the rectifier, in a state where the substrate and a substrate holder holding the substrate are not electrically connected to the rectifier, acquire an output voltage value of the rectifier, compare the output voltage value with a predetermined reference voltage value, and determine that a short circuit occurs in a circuit for connecting the rectifier and the substrate, in a case where the output voltage value is lower than the reference voltage value. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an overall layout of a plating apparatus to which a method according to an embodiment of the present invention can be applied; 
         FIG. 2  is a schematic side cross-sectional view of a plating module included in the plating apparatus; 
         FIG. 3  is a diagram showing a situation where a short circuit occurs in an electric wiring connecting a rectifier to an anode holder and a substrate holder; 
         FIG. 4A  is a diagram showing a short circuit detection method according to the embodiment of the present invention; 
         FIG. 4B  is a diagram showing the short circuit detection method according to the embodiment of the present invention; 
         FIG. 5  is a flowchart showing an overall flow of plating processing in the plating apparatus of the present embodiment; and 
         FIG. 6  is a flowchart showing the short circuit detection method according to the embodiment of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENT 
     Hereinafter, description will be made as to an embodiment of the present invention with reference to the drawings. In the drawings described below, the same or corresponding constituent elements are denoted with the same reference sign and redundant description is not repeated. 
       FIG. 1  is an overall layout of a plating apparatus  10  to which a method according to an embodiment of the present invention can be applied. 
     As shown in  FIG. 1 , the plating apparatus  10  includes two cassette tables  102 , an aligner  104  that aligns a position of an orientation flat, a notch or the like of a substrate in a predetermined direction, and a spin rinse dryer  106  that dries the plated substrate by rotating the substrate at high speed. On each cassette table  102 , a cassette  100  containing the substrate such as a semiconductor wafer is mounted. Near the spin rinse dryer  106 , a load/unload station  120  including a substrate holder  30  mounted thereon is disposed to attach and remove the substrate. In a center of these units  100 ,  104 ,  106  and  120 , a transfer robot  122  is disposed to transfer the substrate to and from these units. 
     The load/unload station  120  includes a flat plate-shaped mounting plate  152  that is slidable in a lateral direction along a rail  150 . Two substrate holders  30  are horizontally mounted in parallel on the mounting plate  152 . The substrate is delivered between one of the substrate holders  30  and the transfer robot  122 , the mounting plate  152  is then laterally slid, and the substrate is delivered between the other substrate holder  30  and the transfer robot  122 . 
     The plating apparatus  10  further includes a stocker  124 , a pre-wet module  126 , a pre-soak module  128 , a first rinse module  130   a , a blow module  132 , a second rinse module  130   b , and a plating module  110 . In the stocker  124 , the substrate holder  30  is stocked and temporarily stored. In the pre-wet module  126 , the substrate is immersed into pure water. In the pre-soak module  128 , an oxide film on the surface of a conductive layer such as a seed layer formed on the surface of the substrate is removed by etching. In the first rinse module  130   a , the pre-soaked substrate is cleaned together with the substrate holder  30  with a cleaning solution (pure water or the like). In the blow module  132 , the cleaned substrate is drained. In the second rinse module  130   b , the plated substrate is cleaned together with the substrate holder  30  with the cleaning solution. The load/unload station  120 , the stocker  124 , the pre-wet module  126 , the pre-soak module  128 , the first rinse module  130   a , the blow module  132 , the second rinse module  130   b  and the plating module  110  are arranged in this order. 
     The plating module  110  is configured, for example, by housing a plurality of plating devices  114  in an overflow tank  136 . In an example of  FIG. 1 , the plating module  110  includes eight plating devices  114 . Each plating device  114  stores one substrate therein, and is configured to immerse the substrate into a plating solution held therein and plate the surface of the substrate with copper or the like. 
     The plating apparatus  10  includes a transfer device  140  in which, for example, a linear motor system is adopted, the transfer device being located on a side of the devices, to transfer the substrate holder  30  together with the substrate among these devices. The transfer device  140  includes a first transfer device  142  and a second transfer device  144 . The first transfer device  142  is configured to transfer the substrate to and from the load/unload station  120 , the stocker  124 , the pre-wet module  126 , the pre-soak module  128 , the first rinse module  130   a , and the blow module  132 . The second transfer device  144  is configured to transfer the substrate to and from the first rinse module  130   a , the second rinse module  130   b , the blow module  132 , and the plating module  110 . The plating apparatus  10  does not have to include the second transfer device  144 , and may only include the first transfer device  142 . 
     On opposite sides of the overflow tank  136 , paddle drive parts  160  and paddle driven parts  162  are arranged to drive paddles that are stirring rods located in the respective plating devices  114 , to stir the plating solution in the plating devices  114 . 
     An example of a series of plating processing by the plating apparatus  10  will be described. First, one substrate is taken out from the cassette  100  mounted on each cassette table  102  with the transfer robot  122 , to transfer the substrate to the aligner  104 . The aligner  104  aligns the position of the orientation flat, the notch or the like in the predetermined direction. The substrate oriented with the aligner  104  is transferred to the load/unload station  120  by the transfer robot  122 . 
     In the load/unload station  120 , two substrate holders  30  stocked in the stocker  124  are simultaneously grasped with the first transfer device  142  of the transfer device  140 , and are transferred to the load/unload station  120 . Then, the two substrate holders  30  are simultaneously horizontally mounted on the mounting plate  152  of the load/unload station  120 . In this state, the substrate is transferred to each substrate holder  30  by the transfer robot  122 , and the transferred substrate is held by the substrate holder  30 . 
     Next, the two substrate holders  30  holding the substrates are simultaneously grasped with the first transfer device  142  of the transfer device  140 , and are stored in the pre-wet module  126 . Next, each substrate holder  30  holding the substrate processed in the pre-wet module  126  is transferred to the pre-soak module  128  by the first transfer device  142 , and the oxide film on the substrate is etched with the pre-soak module  128 . Subsequently, the substrate holder  30  holding the substrate is transferred to the first rinse module  130   a , to wash the surface of the substrate with pure water stored in the first rinse module  130   a.    
     The substrate holder  30  holding the substrate washed with water is transferred from the first rinse module  130   a  to the plating module  110  by the second transfer device  144 , and is stored in each plating device  114  filled with the plating solution. The second transfer device  144  sequentially repeats the above procedure, to sequentially store the substrate holders  30  holding the substrates in the respective plating devices  114  of the plating module  110 . 
     In each plating device  114 , a plating voltage is applied across an anode (not shown) and the substrate in the plating device  114 , and the paddle is reciprocally moved in parallel with the surface of the substrate simultaneously by each paddle drive part  160  and each paddle driven part  162 , to plate the surface of the substrate. 
     After the plating ends, two substrate holders  30  holding the plated substrates are simultaneously grasped with the second transfer device  144 , transferred to the second rinse module  130   b , and immersed into pure water stored in the second rinse module  130   b  to clean the surfaces of the substrates with pure water. Next, the substrate holders  30  are transferred to the blow module  132  by the second transfer device  144 , and water drops adhered to the substrate holders  30  are removed by blowing air or the like. Afterward, the substrate holders  30  are transferred to the load/unload station  120  by the first transfer device  142 . 
     In the load/unload station  120 , the transfer robot  122  takes out each processed substrate from the substrate holder  30 , and transfers the substrate to the spin rinse dryer  106 . The spin rinse dryer  106  rotates at high speed to rotate the plated substrate at high speed and dry the substrate. The transfer robot  122  returns the dried substrate to the cassette  100 . 
       FIG. 2  is a schematic side cross-sectional view of the plating module  110  described above. As shown in the drawing, the plating module  110  includes an anode holder  220  configured to hold an anode  221 , the substrate holder  30  configured to hold a substrate W, the plating device  114  that stores a plating solution Q containing an additive, and the overflow tank  136  that receives the plating solution Q overflowed from the plating device  114  to discharge the solution. The plating device  114  and the overflow tank  136  are separated by a partition wall  255 . The anode holder  220  and the substrate holder  30  are stored in the plating device  114 . As described above, the substrate holder  30  holding the substrate W is transferred by the second transfer device  144  (see  FIG. 1 ) and stored in the plating device  114 . 
     Note that  FIG. 2  shows only one plating device  114 , but the plating module  110  may include a plurality of plating devices  114  having the same configuration as in  FIG. 2  as described above. 
     The anode  221  is electrically connected to a positive terminal  271  of a rectifier  270  via an electric terminal  223  disposed in the anode holder  220 . The substrate W is electrically connected to a negative terminal  272  of the rectifier  270  via an electric contact  242  being in contact with a peripheral edge of the substrate W and an electric terminal  243  disposed in the substrate holder  30 . The rectifier  270  is configured to supply a plating current between the anode  221  connected to the positive terminal  271  and the substrate W connected to the negative terminal  272 , and measure an applied voltage between the positive terminal  271  and the negative terminal  272 . 
     Also, the rectifier  270  is connected to a controller  260  for controlling an operation of the rectifier  270 , and the controller  260  is connected to a computer  265 . The computer  265  provides a user interface for an operator of the plating apparatus  10 . The operator of the plating apparatus  10  can input various types of setting information concerning the plating processing via the computer  265 . The setting information includes, for example, a set value of the plating current to be outputted by the rectifier  270 . The controller  260  operates the rectifier  270  in accordance with the set value of the plating current inputted from the operator. The controller  260  also provides the computer  265  with status information based on information of a voltage measured in the rectifier  270 . The operator of the plating apparatus  10  can receive this status information via the computer  265 . The controller  260  may be configured to control operations of respective parts other than the rectifier  270  in the plating module  110  or respective units other than the plating module  110  in the plating apparatus  10 , and provide the computer  265  with various types of status information concerning these operations. 
     The anode holder  220  holding the anode  221  and the substrate holder  30  holding the substrate W are immersed into the plating solution Q in the plating device  114 , and arranged such that the anode  221  and a plated surface W 1  of the substrate W face each other substantially in parallel with each other. The anode  221  and the substrate W, which are immersed into the plating solution Q in the plating device  114 , receive the plating current supplied from the rectifier  270 . Consequently, metal ions in the plating solution Q are reduced in the plated surface W 1  of the substrate W, to form a film on the plated surface W 1 . 
     The anode holder  220  includes an anode mask  225  for adjusting an electric field between the anode  221  and the substrate W. The anode mask  225  is a substantially plate-shaped member made of, for example, a dielectric material, and is disposed on a front surface (surface on a side that faces the substrate holder  30 ) of the anode holder  220 . Specifically, the anode mask  225  is disposed between the anode  221  and the substrate holder  30 . The anode mask  225  includes, substantially in a center, a first opening  225   a  through which the current flowing between the anode  221  and the substrate W passes. It is preferable that a diameter of the opening  225   a  is smaller than a diameter of the anode  221 . The anode mask  225  may be configured such that the diameter of the opening  225   a  is adjustable. 
     The plating module  110  further includes a regulation plate  230  for adjusting the electric field between the anode  221  and the substrate W. The regulation plate  230  is a substantially plate-shaped member made of, for example, a dielectric material, and is disposed between the anode mask  225  and the substrate holder  30  (substrate W). The regulation plate  230  includes a second opening  230   a  through which the current flowing between the anode  221  and the substrate W passes. It is preferable that a diameter of the opening  230   a  is smaller than a diameter of the substrate W. The regulation plate  230  may be configured such that the diameter of the opening  230   a  is adjustable. Furthermore, a paddle (not shown) as a stirring rod with which the plating solution Q in the plating device  114  is stirred is disposed between the regulation plate  230  and the substrate holder  30  (substrate W). 
     The plating device  114  includes a plating solution supply port  256  for supplying the plating solution Q into the device. The overflow tank  136  includes a plating solution discharge port  257  for discharging the plating solution Q overflowed from the plating device  114 . The plating solution supply port  256  is disposed in a bottom of the plating device  114 , and the plating solution discharge port  257  is disposed in a bottom of the overflow tank  136 . 
     When the plating solution Q is supplied from the plating solution supply port  256  to the plating device  114 , the plating solution Q overflows from the plating device  114 , and flows over the partition wall  255  into the overflow tank  136 . The plating solution Q flowing into the overflow tank  136  is discharged from the plating solution discharge port  257 , and has impurities removed with a filter or the like included in a plating solution circulation device  258 . The plating solution Q from which the impurities are removed is supplied through the plating solution supply port  256  to the plating device  114  by the plating solution circulation device  258 . 
       FIG. 3  shows a situation where a short circuit occurs in an electric wiring connecting the rectifier  270  to the anode holder  220  and the substrate holder  30 . As described above, the substrate W and the substrate holder  30  holding the substrate W are transferred by the second transfer device  144  (see  FIG. 1 ), and stored in the plating device  114 . More specifically, the electric terminal  243  of the substrate holder  30  is connected to a cathode side electric wiring  301  of the rectifier  270 , and the substrate W and the substrate holder  30  holding the substrate W are immersed into the plating solution Q with which the plating device  114  is filled. 
     If a short circuit does not occur between the cathode side electric wiring  301  and an anode side electric wiring  302 , and when the plating current is supplied from the rectifier  270  to the substrate W immersed into the plating solution Q, an output voltage between the positive terminal  271  and the negative terminal  272  of the rectifier  270  indicates a normal value (i.e., a voltage value determined depending on the plating current supplied to the substrate W and a load resistance between the substrate W and the anode  221 ). On the other hand, if a short circuit occurs between the cathode side electric wiring  301  and the anode side electric wiring  302 , the load resistance turns substantially to zero, and the output voltage between the positive terminal  271  and the negative terminal  272  of the rectifier  270  when the plating current flows accordingly noticeably drops from the normal value. If this voltage change (or change in load resistance) is detected, the occurrence of a short circuit can be identified. However, the substrate W is once immersed into the plating solution Q. or the supply of the plating current to the substrate W is already started (presence of a short circuit is then found) and formation of a plating film on the substrate W partially proceeds. Therefore, the substrate has a problem in quality control, and needs to be discarded as a defective product. 
       FIGS. 4A and 4B  are diagrams showing a short circuit detection method according to the embodiment of the present invention.  FIG. 4A  shows a normal state where a short circuit has not occurred yet between the cathode side electric wiring  301  and the anode side electric wiring  302 , and  FIG. 4B  shows a state where a short circuit has occurred between the cathode side electric wiring  301  and the anode side electric wiring  302 . As shown in  FIGS. 4A and 4B , the rectifier  270  is not connected to the substrate W and the substrate holder  30  holding the substrate W. Specifically, the short circuit detection method according to the present embodiment is performed before the substrate W and the substrate holder  30  holding the substrate W are stored in the plating device  114 . 
     The rectifier  270  outputs a current with a predetermined current value for short circuit detection. However, the substrate W and the substrate holder  30  are not connected to the cathode side electric wiring  301  of the rectifier  270 , and hence in the normal state (non-short circuit time) of  FIG. 4A , a circuit between the cathode side electric wiring  301  and the anode side electric wiring  302  is open. Therefore, at normal time of  FIG. 4A , a current does not actually flow through this circuit, and a voltage applied between the positive terminal  271  and the negative terminal  272  of the rectifier  270  is a high voltage. On the other hand, in the short circuit state of  FIG. 4B , the output current from the rectifier  270  flows through a short circuit path between the cathode side electric wiring  301  and the anode side electric wiring  302 , and hence the output voltage between the positive terminal  271  and the negative terminal  272  of the rectifier  270  indicates a voltage value smaller than that in the normal state (non-short circuit time) of  FIG. 4A . 
     The controller  260  acquires, from the rectifier  270 , an output voltage value between the positive terminal  271  and the negative terminal  272 , and compares the value with a predetermined reference voltage value. The controller  260  determines that a short circuit occurs between the cathode side electric wiring  301  and the anode side electric wiring  302 , in a case where the output voltage value between the positive terminal  271  and the negative terminal  272  of the rectifier  270  is lower than the predetermined reference voltage value, and the controller determines that a short circuit does not occur, in a case where the output voltage value is higher than the reference voltage value. 
     Thus, according to the short circuit detection method of the present embodiment, a short circuit between the cathode side electric wiring  301  and the anode side electric wiring  302  can be detected in a state where the rectifier  270  is not connected to the substrate W and the substrate holder  30 , that is, before the substrate W and the substrate holder  30  are stored in the plating device  114  to start the plating processing. Therefore, the method of the present embodiment has an advantage that the substrate W does not have to be used in vain for short circuit detection. 
     In addition, it is preferable that a magnitude of the current to be outputted by the rectifier  270  for the short circuit detection is smaller than a magnitude of the plating current to be outputted when performing plating processing on the substrate W. Consequently, a short circuit can be detected without electrically adversely affecting a circuit (the rectifier  270 , the electric wirings  301  and  302 , the anode  221  and the like). 
       FIG. 5  is a flowchart showing an overall flow of plating processing in the plating apparatus  10  of the present embodiment. First, the transfer device  140  and the transfer robot  122  prepare for operations (step  501 ), and the plating solution Q is prepared in the plating device  114  of the plating module  110  (step  502 ). After completing the preparation of the plating solution Q, short circuit detection according to the present embodiment is performed in step  503  (details will be described later with reference to  FIG. 6 ). Furthermore, the cassette  100  containing the substrate is mounted to each cassette table  102  (step  504 ). 
     Next, the operator sets recipe of the plating processing via the user interface of the computer  265  (step  505 ). When the recipe is set and a start instruction of the plating processing is given, the transfer device  140  and the transfer robot  122  start transfer (step  506 ), the substrate W and the substrate holder  30  are transferred to the plating module  110 , and the plating current is supplied from the rectifier  270  to the substrate W to perform the plating processing on the substrate W (step  507 ). 
     When the plating processing is finished, the plated substrate W is returned to the cassette  100  by the transfer device  140  and the transfer robot  122  (step  508 ), and the cassette  100  containing the plated substrate is removed from the cassette table  102  (step  509 ). Afterward, the processing returns to the step  504  to mount the cassette  100  containing the unprocessed substrate to the cassette table  102 , and the same operation is repeated. 
       FIG. 6  is a flowchart showing the short circuit detection method according to the embodiment of the present invention, and shows the details of the step  503  of the flowchart of  FIG. 5 . 
     First, the controller  260  instructs the rectifier  270  to energize with a predetermined set current value (step  601 ). The predetermined set current value indicates a current value of the current outputted from the rectifier  270  for the short circuit detection, and may be, for example, a value smaller than a value of the plating current outputted from the rectifier  270  for the plating processing (current outputted in the step  507  of  FIG. 5 ). 
     The rectifier  270  starts the energization with the instructed current value (step  602 ), and measures the output voltage between the positive terminal  271  and the negative terminal  272  to transmit the measured value to the controller  260  (step  603 ). 
     The controller  260  acquires the measured value of the output voltage from the rectifier  270  (step  604 ), and compares the voltage value with a predetermined reference voltage value (step  605 ). The predetermined reference voltage value may be an appropriate voltage value set beforehand to appropriately distinguish between a case where there is no short circuit in the circuit ( FIG. 4A ) and a case where there is a short circuit ( FIG. 4B ). 
     In a case where the measured output voltage value of the rectifier  270  is larger than the reference voltage value, the controller  260  clears a measured time of a timer (step  606 ), and then repeats the step  603  and the subsequent steps. 
     In a case where the measured output voltage value of the rectifier  270  is smaller than the reference voltage value, the controller  260  counts up the measured time of the timer (step  607 ), and determines whether or not the measured time is in excess of a predetermined set time (e.g., from several seconds to about ten seconds) (step  608 ). 
     If the measured time is in excess of the set time, the controller  260  determines that a short circuit occurs between the cathode side electric wiring  301  and the anode side electric wiring  302  of the plating module  110 , and instructs the computer  265  and the rectifier  270  to notify with an alarm and stop the energization, respectively (step  609 ). The rectifier  270  stops the energization for the short circuit detection (step  610 ), and the computer  265  notifies the operator of the plating apparatus  10  with the alarm (a character, image, sound or the like) indicating that the short circuit occurs, via the user interface (step  611 ). 
     Thus, in a case where it is detected that a short circuit occurs between the cathode side electric wiring  301  and the anode side electric wiring  302  of the plating module  110 , execution of the step  504  and the subsequent steps of  FIG. 5  may be prohibited. On the other hand, in a case where it is determined that no short circuit occurs, the step  504  and the subsequent steps of  FIG. 5  are executed. Specifically, the substrate W and the substrate holder  30  are connected to the rectifier  270 , and the plating current is supplied from the rectifier  270  to the substrate W to perform the plating processing on the substrate W. Thus, according to the short circuit detection method of the present embodiment, the short circuit can be detected before the plating processing of the substrate W is started, and use of the substrate W in vain for the short circuit detection can be avoided. 
     The embodiment of the present invention has been described above based on several examples, but the above embodiment of the present invention is described to facilitate understanding of the invention, and does not limit the present invention. The present invention may be changed or modified without departing from the scope, and needless to say, the present invention includes equivalents to the invention. Also, any combination or omission of the respective constituent elements described in claims and specification is possible in a range in which at least some of the above described problems can be solved or a range in which at least some of effects are exhibited. 
     REFERENCE SIGNS LIST 
     
         
         
           
               10  plating apparatus 
               30  substrate holder 
               100  cassette 
               102  cassette table 
               104  aligner 
               106  spin rinse dryer 
               110  plating module 
               114  plating device 
               120  load/unload station 
               122  transfer robot 
               124  stocker 
               126  pre-wet module 
               128  pre-soak module 
               130   a  first rinse module 
               130   b  second rinse module 
               132  blow module 
               136  overflow tank 
               140  transfer device 
               142  first transfer device 
               144  second transfer device 
               150  rail 
               152  mounting plate 
               160  paddle drive part 
               162  paddle driven part 
               220  anode holder 
               221  anode 
               223  electric terminal 
               225  anode mask 
               225   a  first opening 
               230  regulation plate 
               230   a  second opening 
               242  electric contact 
               243  electric terminal 
               255  partition wall 
               256  plating solution supply port 
               257  plating solution discharge port 
               258  plating solution circulation device 
               260  controller 
               265  computer 
               270  rectifier 
               271  positive terminal 
               272  negative terminal 
               301  cathode side electric wiring 
               302  anode side electric wiring 
             Q plating solution 
             W substrate 
             W p plated surface