Abstract:
A semiconductor substrate thermal treatment apparatus enables excellent heating control in suppressing influence of mutual induction between induction heating coils even when the induction heating coils are arranged in the vertical direction while providing horizontal magnetic flux to susceptors. The apparatus indirectly heats wafers mounted on horizontally-arranged susceptors including induction heating coils to form alternate-current magnetic flux in a direction parallel to a mount face of the susceptor. The wafer are arranged at an outer circumferential side of the susceptor. The induction heating coils are structured with at least one main heating coil and subordinate heating coils electromagnetically coupled with the main heating coil. Inverse coupling coils inversely-coupled to the subordinate heating coils are provided to the main heating coil, and zone control means separately controls a power ratio while synchronizing frequencies and current waveforms of current to the main heating coil and adjacent subordinate heating coils.

Description:
TECHNICAL FIELD 
     The present invention relates to an apparatus and a method of induction heating, and in particular, relates to an apparatus and a method for semiconductor substrate thermal treatment preferable for performing temperature control of an object to be heated when a substrate such as a wafer with a large diameter is treated. 
     BACKGROUND ART 
     Patent Literature 1 and Patent Literature 2 disclose apparatuses to perform thermal treatment of a substrate such as a semiconductor wafer utilizing induction heating. As illustrated in  FIG. 5 , in the thermal treatment apparatus disclosed in Patent Literature 1 being a batch type thermal treatment apparatus, wafers  2  stacked in multiple stages are put into a crystal process tube  3 , a heating tower  4  which is formed with an electrically-conductive member such as graphite is placed at the outer circumference of the process tube  3 , and a solenoid-like induction heating coil  5  is arranged at the outer circumference thereof. According to the thermal treatment apparatus  1  having the abovementioned structure, the heating tower  4  is heated owing to an influence of magnetic flux generated by the induction heating coil  5  and the wafers  2  placed in the process tube  3  is heated by radiation heat from the heating tower  4 . 
     Further, as illustrated in  FIG. 6 , in the thermal treatment apparatus disclosed in Patent Literature 2 being a sheet type thermal treatment apparatus, concentrically hyper-fractionated susceptors  7  are formed of graphite or the like, wafers  8  are placed at the upper face side of the susceptors  7 , and a plurality of circular induction heating coils  9  are placed at the lower face side on a concentric circle. Here, power control can be performed separately against the plurality of induction heating coils  9 . According to the thermal treatment apparatus  6  having the abovementioned structure, since heat transfer between a susceptor  7  located in a heating range of each induction heating coil  9  and another susceptor  7  heated by another induction heating coil  9  is suppressed, controllability of temperature distribution of the wafers  8  due to power control against the induction heating coils  9  is improved. 
     Further, Patent Literature 2 discloses that heat distribution is appropriately controlled by fractionating the susceptors  7  on which the wafers  8  are placed. Patent Literature 3 discloses that heat distribution is improved with devising of a sectional shape of a susceptor. According to a thermal treatment apparatus disclosed in Patent Literature 3, through consideration that a heat generation amount becomes small at the inner side having small diameter of circularly-formed induction heating coil, increase of the heat generation amount and increase of thermal capacity are to be achieved as causing a distance to an inner side part from the induction heating coil to be shorter than that to an outer side part by enlarging thickness at the inner side part of the susceptor. 
     CITATION LIST 
     Patent Literatures 
     Patent Literature 1: JP 2004-71596 A 
     Patent Literature 2: JP 2009-87703 A 
     Patent Literature 3: JP 2006-100067 A 
     SUMMARY OF INVENTION 
     Technical Problem 
     In any of the thermal treatment apparatuses structured as described above, magnetic flux is to be exerted in perpendicular to graphite. Accordingly, when a metal film or the like is formed at a surface of the wafer as an object to be heated, there may be a case that a wafer is directly heated and a case that temperature distribution control is disturbed. 
     In contrast, when heating is accelerated by providing magnetic flux in the horizontal direction against graphite (susceptor), it becomes difficult to heat a number of susceptors in lamination arrangement. In a case that a plurality of induction heating coils are closely arranged in the laminating direction (vertical direction) to solve the above, there arises a problem that heating control becomes unstable under an influence of mutual induction between induction heating coils. 
     An object of the present invention is to provide an apparatus and a method of induction heating which solve the abovementioned problems and which are capable of enabling excellent heating control as suppressing an influence of mutual induction between induction heating coils even when a plurality of the induction heating coils are arranged in the vertical direction while providing horizontal magnetic flux to susceptors. 
     Solution to Problem 
     An induction heating apparatus according to the present invention for achieving the above object includes a plurality of induction heating coils which are arranged at an outer circumferential side of a plurality of susceptors horizontally arranged as being laminated in the vertical direction and which are adjacently stacked along an arrangement direction of the susceptors while mount faces of the susceptors for objects to be heated and a center axis of winding are in parallel, an inverter which supplies current so that the adjacently arranged induction heating coils have mutually subtractive polarities, and zone control means which separately controls a power ratio supplied to the plurality of the induction heating coils which are adjacently arranged. 
     Further, in the induction heating apparatus having the abovementioned features, it is preferable that the induction heating coils are structured with at least one main heating coil and a subordinate heating coil which is electromagnetically coupled with the main heating coil and that an inverse coupling coil is connected to the main heating coil to generate mutual inductance having a reverse polarity to mutual inductance generated at a space against the subordinate heating coil. 
     With the abovementioned structure, it is possible to cancel or partially cancel mutually induced electromotive force generated between the main heating coil and the subordinate heating coil owing to action of the inverse coupling coil. 
     Further, in the induction heating apparatus having the abovementioned features, it is preferable that a core on which the main heating coil and the subordinate heating coil are wound is provided and that the inverse coupling coil is arranged to have relation of an additive polarity against the subordinate heating coil wound on the core. 
     With the abovementioned structure, owing to that frequencies of current supplied to the main heating coil and the subordinate heating coil are matched and current waveforms are synchronized, the inverse coupling coil generates mutual inductance having a reverse polarity to mutual inductance generated between the subordinate heating coil and the main heating coil. Accordingly, it is possible to cancel or partially cancel mutually induced electromotive force generated between the main heating coil and the subordinate heating coil. 
     Further, an induction heating method for achieving the above object to perform induction heating on an object to be heated which is arranged on each of a plurality of susceptors horizontally arranged as being laminated in the vertical direction includes supplying current so that adjacent induction heating coils have mutually subtractive polarities after a plurality of induction heating coils which generate horizontal magnetic flux against mount faces of the susceptors for objects to be heated are adjacently stacked along a laminating direction of the susceptors, and separately controlling a power ratio to be supplied to the induction heating coils. 
     Further, it is preferable that the induction heating method having the abovementioned features includes generating mutual inductance having a reverse polarity to mutual inductance generated between the adjacent induction heating coils, and cancelling or partially cancelling the mutual inductance generated between the induction heating coils. 
     With the abovementioned method, it is possible to cancel or partially cancel mutually induced electromotive force generated between the main heating coil and the subordinate heating coil. 
     Further, in the induction heating method having the abovementioned features, it is preferable that the mutual inductance having the reverse polarity is generated by an inverse coupling coil which is formed by being wound on a core being same as the core on which the induction heating coil is wound. 
     With the abovementioned method, the inverse coupling coil can be compactly arranged. 
     Advantageous Effects of Invention 
     According to the apparatus and the method of induction heating having the abovementioned features, influences of mutual induction between induction heating coils can be suppressed and excellent heating control can be performed even in a case that a plurality of the induction heating coils are arranged in the vertical direction while providing horizontal magnetic flux to susceptors. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1-1  is a block diagram illustrating a plane structure of a thermal treatment apparatus according to a first embodiment. 
         FIG. 1-2  is a block diagram illustrating a side structure of the thermal treatment apparatus according to the first embodiment. 
         FIG. 2  is a block diagram illustrating a structure of a power source portion in the thermal treatment apparatus according to the first embodiment. 
         FIG. 3  is a block diagram illustrating a manner of magnetic flux cancellation between stacked induction heating coils. 
         FIG. 4-1  is a block diagram illustrating a plane structure of a thermal treatment apparatus according to a second embodiment. 
         FIG. 4-2  is a block diagram illustrating a plane structure of a core used for the thermal treatment apparatus according to the second embodiment. 
         FIG. 5  is a view illustrating a structure of a traditional batch type induction heating apparatus. 
         FIG. 6  is a view illustrating a structure of a traditional sheet type induction heating apparatus. 
     
    
    
     DESCRIPTION OF EMBODIMENTS  
     In the following, embodiments of an induction heating apparatus and an induction heating method according to the present invention will be described in detail with reference to the drawings. First, a general structure of an induction heating apparatus (hereinafter, simply called a thermal treatment apparatus) according to a first embodiment will be described with reference to  FIGS. 1-1 ,  1 - 2  and  2 . Here,  FIG. 1-1  is a block diagram illustrating a plane structure of the thermal treatment apparatus and  FIG. 1-2  is a block diagram illustrating a side structure of the thermal treatment apparatus. Further,  FIG. 2  is an explanatory view of a structure of a power source portion. 
     The thermal treatment apparatus  10  according to the present embodiment is a batch type to perform a thermal treatment while wafers  54  as objects to be heated and susceptors  52  as heating elements are stacked in multiple stages. The thermal treatment apparatus  10  is structured basically with a boat  50  with the wafers  54  and horizontally-arranged susceptors  52  which are laminated in multiple stages in the vertical direction, induction heating coils (a main heating coil  30 , subordinate heating coils  32 ,  34 , and inverse coupling coils  36 ,  38  which are described later in detail) which heat the susceptors  52 , and a power source portion  12  which supplies electric power to the induction heating coils. 
     The susceptors  52  are simply required to be structured with electrically-conductive members as being formed of graphite, SiC, SiC-coated graphite, heat-resistant metal or the like, for example. In the present embodiment, each susceptor  52  has a circular plane shape. 
     The susceptors  52  structuring the boat  50  are arranged as being laminated respectively via a support member  56 . Here, the support members  56  are formed of quartz which is not affected by electromagnetic induction heating. 
     Further, the boat  50  of the present embodiment is mounted on a rotary table  58  which has a motor (not illustrated) and is capable of rotating the susceptors  52  and wafers  54  under thermal treatment procedure. With such a structure, it is possible to suppress deflection of heat distribution to heat the susceptors  52 . Further, as described later, the susceptors  52  can be evenly heated even with an arrangement formation that the induction heating coil being the heating source is deflected from the center of the susceptors  52 . 
     The induction heating coils according to the present embodiment are structured with the single main heating coil  30  and the two subordinate heating coils  32 ,  34  which are arranged adjacently to the main heating coil  30  to be electromagnetically coupled. Each of the above is arranged at the circumference of the susceptors  52  at the outer circumferential side. The main heating coil  30  and the subordinate heating coils  32 ,  34  are adjacently stacked respectively in the same direction as the lamination direction of the susceptors  52 . Further, the main heating coil  30  according to the present embodiment is provided with the inverse coupling coils  36 ,  38  which are electromagnetically inversely-coupled with the two subordinate heating coils  32 ,  34 . Here, the electromagnetic coupling denotes a state of being in relation of mutual induction to cause the subordinate heating coils  32 ,  34  to generate induced electromotive force in a direction to cancel magnetic flux generated by the main heating coil  30  based on variation of current supplied to the main heating current  30 , for example, that is, a state of generating mutual inductance. Further, the electromagnetic inverse coupling denotes a coupling state of generating mutual inductance having a reverse polarity to the mutual inductance generated between the main heating coil  30  and the subordinate heating coil  32 ,  34  in a case of viewing the main heating coil  30  as primary winding (primary coil) and the subordinate heating coil  32 ,  34  respectively as secondary winding (secondary coil). 
     Each of the induction heating coils (the main heating coil  30  and the subordinate heating coils  32 ,  34 ) are structured by winding a copper wire on a core  40  which is arranged at the outer circumferential side of the boat  50 . The core  40  may be formed of ferrite-based ceramic with firing after clay-like material is formed into a shape. This is because the core  40  formed of the abovementioned material enables to flexibly perform shape forming. Further, compared to a case with a separate induction heating coil, owing to using the core  40 , diffusion of magnetic flux can be prevented and highly-efficient induction heating with concentrated magnetic flux can be actualized. 
     In the present embodiment, winding directions of the main heating coil  30  and the subordinate heating coils  32 ,  34  respectively against the core  40  are the same. Further, the inverse coupling coil  36 ,  38  is arranged at a rear end side of the core  40  to which the subordinate heating coil  32 ,  34  is arranged at a top end side (side where the susceptor  52  is arranged) in a state that the winding direction thereof is reversed to that of the subordinate heating coil  32 ,  34 . With such a structure, owing to matching current directions supplied to the main heating coil  30  and the subordinate heating coils  32 ,  34 , the mutual inductance generated between the main heating coil  30  and the subordinate heating coils  32 ,  34  and the mutual inductance generated between the inverse coupling coils  36 ,  38  and the subordinate heating coils  32 ,  34  are reversed in polarity. Accordingly, influences of mutual induction power are mutually cancelled. Accordingly, the influence of the mutual induction generated between the main heating coil  30  and the subordinate heating coil  32 ,  34  which are arranged adjacently to each other is lessened and individual power controllability can be improved. Here, it is preferable that a winding ratio between the subordinate heating coil  32 ,  34  and the inverse coupling coil  36 ,  38  is on the order of 7:1. In this case, it is preferable that the number of winding of the main heating coil  30  is matched with the number of winding of the subordinate heating coil  32 ,  34 . 
     For example, in the embodiment illustrated in  FIG. 2 , in a case that the mutual inductance +M 12  (+M 21 ) generated between the inverse coupling coil  36  and the subordinate heating coil  32  and the mutual inductance −M 12  (−M 21 ) generated between the subordinate heating coil  32  and the main heating coil  30  are equal and the mutual inductance +M 23  (+M 32 ) generated between the inverse coupling coil  38  and the subordinate heating coil  34  and the mutual inductance −M 23  (−M 32 ) generated between the subordinate heating coil  34  and the main heating coil  30  are equal, expressions 1 to 3 are satisfied as I 1  and V 1  denoting current supplied to the subordinate heating coil  32  and voltage of the current, I 2  and V 2  denoting current supplied to the main heating coil  30  and voltage of the current, and I 3  and V 3  denoting current supplied to the subordinate heating coil  34  and voltage of the current. 
     [Expression 1]
 
 V   1   =I   1 ( jωL   1 )+ I   2 ( j ω(− M   21 ))+ I   2 ( j ω(+ M   21 ))  (Expression 1)
 
[Expression 2]
 
 V   2   =I   2 ( jωL   2 )+ I   1 ( j ω(− M   12 )+ I   1 ( j ω(+ M   12 )+ I   3 ( j ω(− M   32 )+ I   3 ( j ω(+ M   32 ))  (Expression 2)
 
[Expression 3]
 
 V   3   =I   3 ( jωL   3 )+ I   2 ( j ω(− M   23 ))+ I   2 ( j ω(+ M   23 ))  (Expression 3)
 
     Here, L 1  denotes self-inductance of the subordinate heating coil  32 , L 2  denotes self-inductance of the main heating coil  30 , and L 3  denotes self-inductance of the subordinate heating coil  34 . 
     The mutual inductance M can be expressed as follows. 
     [Expression 4]
 
 M=k √{square root over ( L   1   ×L   2 )}  (Expression 4)
 
     Here, L 1  and L 2  denote self-inductance of primary wiring and that of secondary wiring. Self-inductance L can be acquired with expression 5. 
     
       
         
           
             
               
                 
                   [ 
                   
                     Expression 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     5 
                   
                   ] 
                 
               
               
                 
                     
                 
               
             
             
               
                 
                   L 
                   = 
                   
                     N 
                     ⁢ 
                     
                       
                         ⅆ 
                         ϕ 
                       
                       
                         ⅆ 
                         I 
                       
                     
                   
                 
               
               
                 
                   ( 
                   
                     Expression 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     5 
                   
                   ) 
                 
               
             
           
         
       
     
     Here, N denotes the number of coil winding, φ denotes magnetic flux (wb), and I denotes a current value. As described above, the number of coil winding is different between the main heating coil  30  and the inverse coupling coil  36 ,  38 . Therefore, even in a case that magnetic flux (dφ) per unit current (dI) is equal, values of the self-inductance L are to be different. Accordingly, to equal the mutual inductance M generated between the inverse coupling coils  36 ,  38  and the subordinate heating coils  32 ,  34  (the polarities are opposite), it is required to adjust a coupling coefficient k. The coupling coefficient k can be varied in accordance with a distance between coils and arrangement formation. Accordingly, the coupling coefficient k for obtaining the mutual inductance +M having a reversed polarity is calculated based on the mutual inductance −M between the main heating coil  30  and the subordinate heating coil  32 ,  34 . To obtain the calculated coupling coefficient k, the inverse coupling coils  36 ,  38  are arranged as the arrangement formation and inter-coil distances are adjusted. 
     Owing to that the above relation is satisfied, terms including the mutual inductance due to mutual induction between the main heating coil  30  and the subordinate heating coils  32 ,  34  are cancelled to each other. Accordingly, it is possible to avoid the influence of mutual induction between the adjacently-arranged induction heating coils. 
     Each core  40  on which the main heating coil  30  or the subordinate heating coil  32 ,  34  is arranged to have a center axis paralleled to a mount face of the susceptor  52  for the wafer  54  (direction in which the center axis of the core  40  is perpendicular to a center axis of the wafer  54  in a stacked state). A top end face of the core  40  being a magnetic face is faced to the susceptor  52 . With the above structure, alternate-current magnetic flux is generated in a direction being parallel to the mount face of the susceptor  52  for the wafer  54  from the magnetic face on which the main heating coil  30  or the subordinate heating coil  32 ,  34  is wound. 
     As described above, in a case of viewing the main heating coil  30  as primary winding and the subordinate heating coil  32 ,  34  as secondary winding, inverters  14   a  to  14   c  which will be described later in detail are connected so that directions of current supplied to the both are to be same. Accordingly, the main heating coil  30  and the subordinate heating coils  32 ,  34  which are stacked in the vertical direction have mutually subtractive polarities. 
     As illustrated in  FIG. 3 , with the main heating coil  30  and the subordinate heating coils  32 ,  34  in arrangement relation as described above, magnetic flux respectively emitted as vertically intersecting the mount face of the susceptor  52  is cancelled as being oriented in mutually opposite directions. Accordingly, even in a case that a metal film or the like is formed on a surface of the wafer  54  to be mounted on the susceptor  52 , there is not a fear that the wafer  54  is directly heated owing to influence of the magnetic flux in the vertical direction and that temperature distribution of the wafer  54  is varied. 
     Here, it is preferable that the main heating coil  30 , the subordinate heating coils  32 ,  34 , and the inverse coupling coils  36 ,  38  are structured with tubular members (e.g., copper pipes) having the inside thereof be hollow. This is because own-heating of the main heating coil  30 , the subordinate heating coils  32 ,  34 , and the inverse coupling coils  36 ,  38  can be suppressed by passing a cooling member (e.g., cooling water) through the inside of the copper pipes during thermal treatment. 
     As described above, the main heating coil  30  and the subordinate heating coils  32 ,  34  are adjacently arranged in the vertical direction along the boat  50  on which the susceptors  52  with the wafers  54  mounted are laminated in the vertical direction. With the above structure, it becomes possible to heat more susceptors  52  and wafers  54  at one time, so that thermal treatment of the wafers  54  can be performed effectively. Further, when power control against the induction heating coils which are arranged as being laminated is performed separately, vertical temperature distribution at a plurality of the susceptors  52  which are arranged as being laminated in the boat  50  can be controlled and temperature variation among the susceptors  52  can be suppressed. 
     The main heating coil  30  and the subordinate heating coils  32 ,  34  structured as described above are connected to a single power source portion  12 . The power source portion  12  is provided with the inverters  14   a  to  14   c , choppers  16   a  to  16   c , a converter  18 , a three-phase AC power source  20 , and zone controller  22  and is structured to be capable of adjusting current, voltage, frequencies and the like to be supplied to the respective induction heating coils (the main heating coil  30  and the subordinate heating coils  32 ,  34 ). In the embodiment illustrated in  FIG. 2 , a series resonance type is adopted as the inverters  14   a  to  14   c . Accordingly, as a structure to facilitate frequency switching, it is preferable that increase and decrease of capacity are achieved in accordance with a resonance frequency by a switch  28  as resonance capacitors  26  being connected in parallel. 
     Further, in the thermal treatment apparatus  10  according to the embodiment, a transformer  24  is arranged between each of the induction heating coils (the main heating coil  30  and the subordinate heating coil  32 ,  34 ) and each of the inverters  14   a  to  14   c.    
     The zone controller  22  has a function to perform power control against the main heating coil  30  and the respective subordinate heating coils  32 ,  34  while avoiding influences of mutual induction generated between the main heating coil  30  and the subordinate heating coil  32 ,  34  which are adjacently arranged. 
     Since the main heating coil  30  and the subordinate heating coils  32 ,  34  which are adjacently arranged as being laminated are operated separately, there may be a case that a harmful influence occurs at separate power control with occurrence of mutual induction between the main heating coil  30  and the subordinate heating coil  32  or between the main heating coil  30  and the subordinate heating coil  34 . Accordingly, owing to matching frequencies of current to be supplied to the main heating coil  30  and the subordinate heating coil  32 ,  34  which are adjacently arranged and controlling to synchronize phases of current waveforms (to set phase difference to zero or to approximate phase difference to zero) or to maintain predetermined phase difference based on detected current frequencies and waveforms (current waveforms) with the zone controller  22 , it becomes possible to perform power control (zone control) while avoiding influences of mutual induction between the main heating coil  30  and the subordinate heating coil  32 ,  34  which are adjacently arranged. 
     For example, in the abovementioned control, current values, current frequencies, voltage values and the like supplied to the respective induction heating coils (the main heating coil  30  and the subordinate heating coils  32 ,  34 ) are detected and input to the zone controller  22 . The zone controller  22  detects phases of the current waveform supplied to the main heating coil  30  and the current waveform supplied to the subordinate heating coils  32 ,  34  and outputs a signal to the inverter  14   b  or the inverter  14   c  to instantly vary current frequency to be supplied to the subordinate heating coil  32  or the subordinate heating coil  34  for controlling to perform synchronization of the above or to maintain predetermined phase difference. 
     Further, regarding the power control, it is simply required to perform power control for obtaining desired vertical temperature distribution as outputting signals for varying into elapsed time from a thermal treatment start to the inverters  14   a  to  14   c  or the choppers  16   a  to  16   c  based on a control map (vertical temperature distribution control map) which is stored in storage means (memory; not illustrated) arranged at the power source portion  12  or as being based on temperature of susceptors  52  fed back from temperature measuring means (not illustrated). Here, it is simply required that the control map has power values applied to the main heating coil  30  and the subordinate heating coils  32 ,  34  be recorded along with elapsed time from the thermal treatment start for correcting temperature variation between the susceptors  52  which are arranged as being laminated from the thermal treatment start to a thermal treatment end and for obtaining an arbitrary temperature distribution (e.g., even temperature distribution). 
     In this manner , at the power source portion  12 , owing to that current frequencies supplied to the subordinate heating coils  32 ,  34  are instantly adjusted based on the signals from the zone controller  22  and phase control of current waveforms is performed while performing power control among the respective induction heating coils, it is possible to control temperature distribution in the vertical direction in the boat  50 . 
     Further, in the thermal treatment apparatus  10  according to the embodiment, owing to arranging the inverse coupling coils  36 ,  38  which are electromagnetically inversely-coupled with the subordinate heating coils  32 ,  34 , it is possible to previously suppress influences of mutual induction between the main heating coil  30  and the subordinate heating coils  32 ,  34 . Accordingly, the influence of mutual induction to be avoided by the zone controller  22  becomes small and controllability of power control against the main heating coil  30  and the subordinate heating coils  32 ,  34  can be improved. 
     Further, according to the thermal treatment apparatus  10  having the abovementioned structure, even in a case that an electrically-conductive member such as a metal film is formed on a surface of the wafer  54 , there is not a fear that the metal film produces heat to cause disturbance of temperature distribution of the wafer  54 . 
     Next, a second embodiment of a thermal treatment apparatus of the present invention will be described with reference to  FIG. 4 . Most of a structure of the thermal treatment apparatus according to the present embodiment is the same as the abovementioned thermal treatment apparatus according to the first embodiment. Here, a numeral being added with one hundred is given in the drawing to a portion having the same structure as the thermal treatment apparatus according to the first embodiment and detailed description thereof will not be repeated. 
       FIG. 4-1  is a block diagram illustrating a plane structure of a thermal treatment apparatus  110  according to the second embodiment and  FIG. 4-2  is a block diagram illustrating a plane structure of a core used for the thermal treatment apparatus  110  according to the present embodiment. Although illustration of a power source portion is skipped in the drawing, it is assumed that the power source portion having the similar structure to the abovementioned embodiment is connected. 
     The thermal treatment apparatus  110  according to the present embodiment has a feature that a plurality of the induction heating coils with each corresponding to the subordinate heating coil  32 , the main heating coil  30 , and the subordinate heating coil  34  according to the first embodiment. In  FIG. 4-1 , only subordinate heating coils  132   a ,  132   b  are illustrated, and hereinafter, are simply called induction heating coils  132   a ,  132   b  for ease of description. 
     Owing to that the plurality of induction heating coils  132   a ,  132   b  are arranged in a direction along the circumferential direction of susceptors  152 , a range capable of heating is increased in the horizontal direction and temperature distribution in a surface of a wafer  154  can be stabled. 
     Further, the thermal treatment apparatus  110  according to the embodiment has a structure that a plurality of (two in the embodiment illustrated in  FIG. 4-1 ) induction heating coils  132   a ,  132   b  are wound on a singularly-formed core  140  and that the induction heating coils  132   a ,  132   b  are wound respectively on magnetic poles  141   a ,  141   b  protruded from a yoke  141 . Further, the thermal treatment apparatus  110  according to the present embodiment has a structure that the induction heating coils  132   a ,  132   b  arranged in the circumferential direction of the susceptors  152  (horizontal direction) are connected to the power source portion (actually, inverters at the power source portion) in parallel. This is because the abovementioned structure enables to eliminate necessity to consider an influence of mutual inductance between the induction heating coil  132   a  and the induction heating coil  132   b  which are arranged in parallel. 
     Further, winding directions of the respective induction heating coils  132   a ,  132   b  on the magnetic poles  141   a ,  141   b  of the core  140  are set so that magnetic flux generated by the both respectively has an additive polarity. In a case of the abovementioned structure, magnetic flux is to be generated on loci as illustrated with broken lines a to c. Accordingly, it becomes possible to heat the center side of the susceptors  152  compared to magnetic flux generated by one induction heating coil. 
     Here, the two induction heating coils  132   a ,  132   b  may be selectable between single operation and mutual operation with a change-over switch (not illustrated). In a case of the abovementioned structure, since a heating range of the susceptors  152  is varied in accordance with combination of induction heating coils to be operated, it is possible to perform temperature distribution control in a surface of the wafer  154 . 
     REFERENCE SIGNS LIST 
     
         
           10  Semiconductor substrate thermal treatment apparatus (Thermal treatment apparatus) 
           12  Power source portion 
           14   a - 14   c  Inverter 
           16   a - 16   e  Chopper 
           18  Converter 
           20  Three-phase AC power source 
           22  Zone controller 
           24  Transformer 
           26  Resonance capacitor 
           28  Switch 
           30  Main heating coil 
           32 ,  34  Subordinate heating coil 
           36 ,  38  Inverse coupling coil 
           40  Core 
           50  Boat 
           52  Susceptor 
           54  Wafer 
           56  Support member 
           58  Rotary table