Patent Publication Number: US-2023139557-A1

Title: Substrate treating apparatus and substrate reversing method

Description:
TECHNICAL FIELD 
     The present invention relates to a substrate treating apparatus for treating substrates and a substrate reversing method. Examples of the substrates include a semiconductor wafer, a substrate for liquid crystal display, a substrate for organic electroluminescence (EL), a substrate for flat panel display (FPD), a substrate for optical display, a magnetic disk substrate, an optical disk substrate, a magneto-optical disk substrate, a substrate for photomask, and a solar cell substrate. 
     DESCRIPTION OF THE RELATED ART 
     Patent Literature 1 discloses a substrate cleaning apparatus. Hereinunder, numerals in the Patent Literature 1 are expressed in parentheses. The substrate cleaning apparatus includes a reversing unit ( 18 ). The reversing unit ( 18 ) rotates a substrate (W) around a horizontal axis. The reversing unit ( 18 ) reverses the substrate (W). 
     The reversing unit ( 18 ) includes a plurality of support pins ( 72 ), a pair of chucks ( 73 ), and one rotator ( 74 ). The support pins ( 72 ) support the substrate (W). The paired chucks ( 73 ) contact the substrate (W). The paired chucks ( 73 ) grasp an edge of the substrate (W). The rotator ( 74 ) supports the paired chucks ( 73 ). The rotator ( 74 ) rotates the paired chucks ( 73 ) around a horizontal rotation axis. 
     The substrate cleaning apparatus includes a transportation unit ( 12 ). The transportation unit ( 12 ) transports a substrate (W) to the reversing unit ( 18 ). The transportation unit ( 12 ) includes a substrate holder ( 51 ). The substrate holder ( 51 ) contacts the substrate (W). The substrate holder ( 51 ) holds the substrate (W). 
     The reversing unit ( 18 ) and the transportation unit ( 12 ) operate as under. The substrate holder ( 51 ) delivers a substrate (W) to the support pins ( 72 ). The paired chucks ( 73 ) receive the substrate (W) from the support pins ( 72 ). The rotator ( 74 ) rotates the paired chucks ( 73 ). This causes the substrate (W) to be reversed. The paired chucks ( 73 ) deliver the substrate (W) to the support pins ( 72 ). The substrate holder ( 51 ) receives the substrate (W) from the support pins ( 72 ). 
     PRIOR ART DOCUMENT 
     Patent Literature 
     [Patent Literature 1] 
     Japanese Unexamined Patent Publication No. 2003-59885A 
     SUMMARY OF THE INVENTION 
     Technical Problem 
     In recent years, substrates have become thinner and larger in diameter. A bending amount of a substrate becomes remarkably large as the substrate has a small thickness and a large diameter. Consequently, the currently-used apparatus may have difficulty in reversing a substrate suitably. For example, a substrate may be damaged or broken while the substrate is reversed. 
     The present invention has been made regarding the state of the art noted above, and its object is to provide a substrate treating apparatus and a substrate reversing method that enable suitable inverse of a substrate. 
     Solution to Problem 
     The present invention is constituted as stated below to achieve the above object. One aspect of the present invention provides a substrate treating apparatus, including a supporting portion configured to contact a substrate to support the substrate in a horizontal posture, a transport mechanism configured to transport the substrate to the supporting portion, and a reversing mechanism configured to receive the substrate from the supporting portion, to reverse the substrate, and to deliver the substrate to the supporting portion. The transport mechanism includes a first suction portion configured to suck the substrate without contacting the substrate, and a transport driving unit configured to move the first suction portion, and the reversing mechanism includes a second suction portion configured to suck the substrate without contacting the substrate, and a rotation driving unit configured to rotate the second suction portion around a horizontal rotation axis. When the transport mechanism transports a substrate to the supporting portion, the first suction portion is located above the substrate and sucks the substrate upward while causing gas to flow along a top face of the substrate and the transport driving unit moves the first suction portion to the supporting portion, and when the reversing mechanism receives the substrate from the supporting portion, the second suction portion is located above the substrate supported by the supporting portion and sucks the substrate upward while causing gas to flow along a top face of the substrate. 
     The first suction portion sucks the substrate without contacting the substrate. Consequently, the transport mechanism can suitably support the substrate. The transport mechanism includes the transport driving unit. Accordingly, the transport mechanism can suitably transport the substrate sucked by the first suction portion. 
     The second suction portion sucks the substrate without contacting the substrate. Consequently, the reversing mechanism can suitably support the substrate. The reversing mechanism includes the rotation driving unit. Accordingly, the reversing mechanism can suitably reverse the substrate sucked by the second suction portion. 
     The transport mechanism transports the substrate to the supporting portion, and the reversing mechanism receives the substrate from the supporting portion. In this manner, the reversing mechanism indirectly receives the substrate from the transport mechanism via the supporting portion. The reversing mechanism does not receive the substrate directly from the transport mechanism. Accordingly, the second suction portion can suck the substrate suitably. 
     The supporting portion supports a substrate in a horizontal posture. 
     Accordingly, the second suction portion can suck the substrate more suitably. 
     When the transport mechanism transports a substrate to the supporting portion, the first suction portion is positioned above the substrate. Accordingly, the transport mechanism can deliver the substrate to the supporting portion suitably. 
     When the reversing mechanism receives the substrate from the supporting portion, the second suction portion is positioned above the substrate supported by the supporting portion. Accordingly, the reversing mechanism can suitably receive the substrate from the supporting portion. 
     As described above, the substrate treating apparatus according to the aspect of the present invention can reverse the substrate suitably. 
     It is preferred in the substrate treating apparatus described above that the supporting portion includes a position adjusting unit configured to adjust a position of the substrate in a horizontal direction. The substrate supported by the supporting portion is located at a suitable position. Accordingly, the second suction portion can suitably suck the substrate supported by the supporting portion. The reversing mechanism can suitably receive the substrate from the supporting portion. 
     It is preferred that in the substrate treating apparatus described above that the position adjusting unit has a slope face that is inclined downward and radially inward of the substrate supported by the supporting portion and contacts the edge of the substrate. The slope face is inclined downward and radially inward of the substrate supported by the supporting portion. The slope face contacts the edge of the substrate. Accordingly, the position adjusting unit can suitably guide the substrate to a suitable position. 
     It is preferred in the substrate treating apparatus described above that the second suction portion is moved from a position above the substrate to a position below the substrate when the reversing mechanism reverses the substrate, the second suction portion is positioned below the substrate and does not suck the substrate when the reversing mechanism delivers the substrate to the supporting portion, and the second suction portion is at rest from when the reversing mechanism delivers the substrate to the supporting portion until when the supporting portion delivers the substrate to the transport mechanism. When the reversing mechanism reverses the substrate, the second suction portion sucks the substrate and the rotation driving unit rotates the second suction portion around the rotation axis. Accordingly, when the reversing mechanism reverses the substrate, the second suction portion is moved from a position above the substrate to a position below the substrate. Consequently, the reversing mechanism can suitably reverse the substrate. When the reversing mechanism delivers the substrate to the supporting portion, the second suction portion is positioned below the substrate and does not suck the substrate. Accordingly, the reversing mechanism can deliver the substrate to the supporting portion appropriately. The second suction portion does not move from when the reversing mechanism delivers the substrate to the supporting portion until when the supporting portion delivers the substrate to the transport mechanism. Accordingly, the supporting portion can deliver the substrate to the transport mechanism rapidly after the reversing mechanism delivers the substrate to the supporting portion. 
     It is preferred in the substrate treating apparatus described above that the rotation driving unit moves the second suction portion between a first position where the second suction portion blows gas downward and a second position where the second suction portion blows gas upward by rotating the second suction portion around the rotation axis, the rotation axis is located at a position lower than the second suction portion at the first position, and the second suction portion at the first position is located higher than the second suction portion at the second position. The rotation driving unit moves the second suction portion to the first position by rotating the second suction portion around the rotation axis. When the second suction portion is located at the first position, the second suction portion blows gas downward. Accordingly, when the second suction portion is located at the first position, the second suction portion can suitably suck the substrate located below the second suction portion. The rotation driving unit moves the second suction portion to the second position by rotating the second suction portion around the rotation axis. When the second suction portion is located at the second position, the second suction portion blows gas upward. Accordingly, when the second suction portion is located at the second position, the second suction portion can suitably suck the substrate located above the second suction portion. The rotation axis is located at a position lower than the second suction portion at the first position. Accordingly, the second suction portion at the first position is located at a position higher than the second suction portion at the second position. Consequently, when the second suction portion is located at the first position, the second suction portion can be located above the substrate easily. Accordingly, when the second suction portion is located at the first position, the reversing mechanism can suitably receive the substrate from the supporting portion. On the other hand, the second suction portion at the second position is located at a position lower than the second suction portion at the first position. Consequently, when the second suction portion is located at the second position, the second suction portion can be located below the substrate easily. Accordingly, when the second suction portion is located at the second position, the reversing mechanism can suitably deliver the substrate to the supporting portion. 
     It is preferred in the substrate treating apparatus described above that the second suction portion is located at the second position and does not suck the substrate when the reversing mechanism delivers the substrate to the supporting portion, and the second suction portion is kept at the second position from when the reversing mechanism delivers the substrate to the supporting portion until when the supporting portion delivers the substrate to the transport mechanism. When the reversing mechanism delivers the substrate to the supporting portion, the second suction portion is located at the second position and does not suck the substrate. Accordingly, the reversing mechanism can deliver the substrate to the supporting portion appropriately. The second suction portion is kept at the second position from when the reversing mechanism delivers the substrate to the supporting portion until when the supporting portion delivers the substrate to the transport mechanism. Accordingly, the supporting portion can deliver the substrate to the transport mechanism rapidly after the reversing mechanism delivers the substrate to the supporting portion. 
     It is preferred in the substrate treating apparatus described above that the second suction portion is located more radially inward of the substrate, supported by the supporting portion, than the supporting portion in plan view when the second suction portion is located at the second position. When the second suction portion is located at the second position, the second suction portion can suck the substrate more suitably. On the other hand, there needs a relatively long time to retreat the second suction portion from the second position. As described above, however, the second suction portion is kept at the second position from when the reversing mechanism delivers the substrate to the supporting portion until when the supporting portion delivers the substrate to the transport mechanism. Accordingly, this can appropriately suppress delay in timing at which the supporting portion delivers the substrate to the transport mechanism. 
     It is preferred that the substrate treating apparatus described above further includes a lifting drive unit configured to move the supporting portion between a first support position and a second support position lower than the first support position, and that the second suction portion is located at a position higher than the substrate supported by the supporting portion at the first support position when the second suction portion is located at the first position, and a height position of the substrate sucked by the second suction portion at the second position is lower than a height position of the substrate supported by the supporting portion at the first support position and is higher than a height position of the substrate supported by the supporting portion at the second support position. When the second suction portion is located at the first position, the second suction portion is located higher than the substrate supported by the supporting portion at the first support position. Accordingly, when the second suction portion is located at the first position, the second suction portion can be easily positioned above the substrate supported by the supporting portion at the first support position. Consequently, when the second suction portion is located at the first position, the reversing mechanism can receive the substrate from the supporting portion easily. The height position of the substrate sucked by the second suction portion at the second position is lower than the height position of the substrate supported by the supporting portion at the first support position and higher than the height position of the substrate supported by the supporting portion at the second support position. Accordingly, when the second suction portion is located at the second position, the supporting portion can suitably receive the substrate from the reversing mechanism by moving from the second support position to the first support position. That is, when the second suction portion is located at the second position, the reversing mechanism can suitably deliver the substrate to the supporting portion. 
     It is preferred in the substrate treating apparatus described above that the supporting portion is located at the first support position when the transport mechanism delivers the substrate to the supporting portion, the supporting portion is located at the first support position when the reversing mechanism receives the substrate from the supporting portion, the supporting portion is located at the second support position when the reversing mechanism reverses the substrate, and the supporting portion is moved from the second support position to the first support position when the reversing mechanism delivers the substrate to the supporting portion. The supporting portion is only located at two positions (specifically, first support position and second support position). This achieves a simplified configuration of the lifting drive unit. 
     It is preferred in the substrate treating apparatus described above that the reversing mechanism further includes a movement driving unit configured to move the second suction portion from the first position to a third position where no interference is made with the transport mechanism, and that the second suction portion is located at the third position when the transport mechanism delivers the substrate to the supporting portion. This can appropriately prevent interference of the second suction portion with the transport mechanism when the transport mechanism delivers the substrate to the supporting portion. 
     It is preferred in the substrate treating apparatus described above that the second suction portion is positioned more radially outward of the substrate, supported by the supporting portion, than the supporting portion in plan view when the second suction portion is located at the third position. This can ensure that interference of the second suction portion with the transport mechanism is prevented when the second suction portion is located at the third position. 
     It is preferred in the substrate treating apparatus described above that the reversing mechanism includes a first branch connected to the movement driving unit and a second branch connected to the movement driving unit, the second suction portion includes a third suction portion held by the first branch and a fourth suction portion held by the second branch, that the movement driving unit widens and narrows a gap between the first branch and the second branch, and the movement driving unit moves the second suction portion from the first position to the third position by widening the gap between the first branch and the second branch. This can appropriately suppress a moving amount of the second suction portion when the second suction portion is moved from the first position to the third position. Accordingly, the movement driving unit can move the second suction portion from the first position to the third position easily. 
     It is preferred in the substrate treating apparatus described above that the rotation axis is located so as to pass between the first branch and the second branch in plan view when the second suction portion is located at the first position, the first branch and the second branch are each moved away from the rotation axis in plan view when the second suction portion is moved from the first position to the third position, and the first branch and the second branch each approach the rotation axis in plan view when the second suction portion is moved from the third position to the first position. This can suppress a moving amount of the second suction portion more appropriately when the second suction portion is moved between the first position and the third position. Accordingly, the movement driving unit can move the second suction portion between the first position and the third position more easily. 
     Another aspect of the present invention discloses a substrate reversing method for reversing a substrate, including a transporting step of causing a transport mechanism with a first suction portion to transport the substrate to a supporting portion, a first supporting step of causing the supporting portion to receive the substrate from the transport mechanism and to support the substrate in a horizontal posture, a first taking step of causing a reversing mechanism with a second suction portion to take the substrate from the supporting portion, a reversing step of causing the reversing mechanism to reverse the substrate, and a second supporting step of causing the supporting portion to receive the substrate from the reversing mechanism and to support the substrate in a horizontal posture. In the transporting step, the first suction portion is located above the substrate, and the first suction portion sucks the substrate upward by causing gas to flow over a top face of the substrate and is moved to the supporting portion. In the first taking step, the second suction portion is located at a first position as a position above the substrate supported by the supporting portion, and sucks the substrate upward by causing gas to flow over the top face of the substrate. In the reversing step, the second suction portion is half-rotated around a horizontal rotation axis to be moved from the first position to a second position while the second suction portion sucks the substrate. 
     In the transporting step, the transport mechanism transports the substrate to the supporting portion. The transport mechanism includes the first suction portion. In the transporting step, the first suction portion is located above the substrate, and sucks the substrate upward while causing gas to flow over the top face of the substrate. Consequently, the transport mechanism can support the substrate appropriately in the transporting step. 
     In the transporting step, the first suction portion is moved to the supporting portion while sucking the substrate. Accordingly, the transport mechanism can transport the substrate, sucked by the first suction portion, to the supporting portion appropriately in the transporting step. 
     In the first supporting step, the supporting portion receives the substrate from the transport mechanism. The supporting portion supports the substrate in a horizontal posture. As described above, in the transporting step, the first suction portion is located above the substrate. Accordingly, in the first supporting step, the supporting portion can receive the substrate from the transport mechanism appropriately. 
     In the first taking step, the reversing mechanism takes the substrate from the supporting portion. The reversing mechanism includes the second suction portion. In the first taking step, the second suction portion is located at the first position. Here, the first position is a position above the substrate supported by the supporting portion. In the first taking step, the second suction portion sucks the substrate upward while causing gas to flow over the top face of the substrate. Accordingly, in the first taking step, the reversing mechanism can take the substrate from the supporting portion suitably. 
     As described above, in the first supporting step, the supporting portion supports the substrate in a horizontal posture. Accordingly, in the first taking step, the second suction portion can suck the substrate suitably. 
     As described above, the substrate reversing method includes the first supporting step. Accordingly, the transport mechanism transports the substrate to the supporting portion. The reversing mechanism takes the substrate from the supporting portion. In this manner, the reversing mechanism indirectly receives the substrate from the transport mechanism via the supporting portion. The reversing mechanism does not receive the substrate directly from the transport mechanism. Accordingly, the second suction portion can suck the substrate more suitably. Consequently, in the first taking step, the reversing mechanism can take the substrate from the supporting portion more suitably. 
     In the reversing step, the reversing mechanism reverses the substrate. Specifically, the second suction portion is half-rotated around the horizontal rotation axis to be moved from the first position to the second position while sucking the substrate. Accordingly, the reversing mechanism can reverse the substrate, sucked by the second suction portion, appropriately in the reversing step. 
     In the second supporting step, the supporting portion receives the substrate from the reversing mechanism. The supporting portion supports a substrate in a horizontal posture. Here, in the second supporting step, the second suction portion is located at the second position. As described above, the second position is a position where the second suction portion is half-rotated around the horizontal rotation axis from the first position. Accordingly, when the second suction portion is located at the second position, the second suction portion is located below the substrate. Consequently, in the second supporting step, the supporting portion can receive the substrate from the reversing mechanism appropriately. 
     As described above, the substrate reversing method according to the aspect of the present invention can reverse the substrate suitably. 
     It is preferred in the substrate reversing method described above that a position of the substrate in a horizontal direction is adjusted in the first supporting step. In the first supporting step, the substrate supported by the supporting portion is located at a suitable position. Accordingly, the second suction portion can suitably suck the substrate supported by the supporting portion in the first taking step. 
     It is preferred in the substrate reversing method described above that the supporting portion is at rest at a first support position in the first supporting step, the supporting portion is at rest at the first support position in the first taking step, the supporting portion is moved from the first support position to a second support position lower than the first support position in the reversing step, and the supporting portion is moved from the second support position to the first support position in the second supporting step. The supporting portion is at rest at only two positions (specifically, first support position and second support position). This achieves simplified operation of the supporting portion. 
     It is preferred in the substrate reversing method described above that the second suction portion is located at a position higher than the substrate supported by the supporting portion at the first support position when the second suction portion is located at the first position, a height position of the rotation axis is lower than a height position of the second suction portion at the first position, a height position of the second suction portion at the second position is lower than the height position of the second suction portion at the first position, the height position of the substrate sucked by the second suction portion at the second position is lower than a height position of a substrate supported by the supporting portion at the first support position, and the height position of the substrate sucked by the second suction portion at the second position is higher than a height position of the substrate supported by the supporting portion at the second support position. 
     When the second suction portion is located at the first position, the second suction portion is located higher than the substrate supported by the supporting portion at the first support position. Accordingly, the second suction portion can suitably suck the substrate supported by the supporting portion at the first support position in the first taking step. 
     The height position of the rotation axis is lower than the height position of the second suction portion at the first position. Accordingly, the height position of the second suction portion at the second position is lower than the height position of the second suction portion at the first position. That is, the height position of the second suction portion is lowered as the second suction portion is moved from the first position to the second position. Here, the height position of the substrate sucked by the second suction portion at the second position is lower than the height position of the substrate supported by the supporting portion at the first support position and higher than the height position of the substrate supported by the supporting portion at the second support position. Accordingly, the reversing mechanism can deliver the substrate to the supporting portion appropriately in the second supporting step. In the second supporting step, the supporting portion is moved from the second support position to the first support position, thereby achieving appropriate receipt of the substrate from the reversing mechanism. 
     It is preferred that the substrate reversing method described above further includes a second taking step of causing the transport mechanism to take a substrate from the supporting portion, and the second suction portion is at rest at the second position from the second supporting step to the second taking step. The second taking step can start immediately after the second supporting step. 
     It is preferred that the substrate reversing method described above further includes a retreating step of causing the second suction portion to move from the second position to a third position where no interference is made with the transport mechanism after the second taking step, and the second suction portion is located at the third position in the first supporting step. The second taking step is performed before the retreating step. Accordingly, the second taking step can be performed at an early timing. In the first supporting step, the second suction portion is located at the third position. This can appropriately prevent interference of the second suction portion with the transport mechanism in the first supporting step. 
     It is preferred in the substrate reversing method described above that the retreating step further includes a lowering step of causing the supporting portion to move from the first support position to the second support position, a first moving step of causing the second suction portion to rotate around the rotation axis to move from the second position to the first position after the lowering step, a second moving step of causing the second suction portion to move from the first position to the third position after the first moving step, and a raising step of causing the supporting portion to move from the second support position to the first support position after the first moving step. In the retreating step, the second suction portion can move from the second position to the third position appropriately. 
     Effect of the Invention 
     The present invention can cause a substrate to be reversed suitably. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    is a plan view of an interior of a substrate treating apparatus according to one embodiment. 
         FIG.  2 ( a )  is a side view of a substrate, and  FIG.  2 ( b )  is a plan view of the substrate. 
         FIGS.  3 ( a ) and  3 ( b )  are each one example illustrating a sectional view of a shape of a substrate W. 
         FIGS.  4 ( a ) and  4 ( b )  are each one example illustrating a side view of a configuration of the substrate W. 
         FIG.  5    is a left side view of a central portion of the substrate treating apparatus in a transverse direction. 
         FIG.  6 ( a )  is a front view of a substrate platform, and  FIG.  6 ( b )  is a plan view of the substrate platform. 
         FIG.  7    is a left side view of a left part of the substrate treating apparatus. 
         FIG.  8    is a control block diagram of the substrate treating apparatus. 
         FIG.  9    schematically illustrates procedures of transporting one substrate. 
         FIG.  10    is a bottom view of a hand of a transport mechanism. 
         FIGS.  11 ( a ),  11 ( b ), and  11 ( c )  are each a side view of the hand of the transport mechanism. 
         FIG.  12    is a side view of an inversion unit. 
         FIG.  13    is a partial plan view of the inversion unit. 
         FIG.  14    is a partial front view of the inversion unit. 
         FIG.  15    is another partial front view of the inversion unit. 
         FIG.  16    is a flowchart showing procedures of an exemplary operation of reversing a substrate. 
         FIGS.  17 ( a ),  17 ( b ), and  17 ( c )  are each a plan view schematically illustrating an exemplary operation of a transporting step and a first supporting step. 
         FIGS.  18 ( a ) to  18 ( h )  are each a side view schematically illustrating an exemplary operation of the transporting step and the first supporting step. 
         FIG.  19 ( a )  is a front view schematically illustrating an exemplary operation of a first taking step, and  FIG.  19 ( b )  is a plan view schematically illustrating the exemplary operation of the first taking step. 
         FIG.  20 ( a )  is a front view schematically illustrating an exemplary operation of the first taking step, and  FIG.  20 ( b )  is a plan view schematically illustrating the exemplary operation of the first taking step. 
         FIG.  21 ( a )  is a front view schematically illustrating an exemplary operation of the first taking step, and  FIG.  21 ( b )  is a plan view schematically illustrating the exemplary operation of the first taking step. 
         FIG.  22 ( a )  is a front view schematically illustrating an exemplary operation of a reversing step, and  FIG.  22 ( b )  is a plan view schematically illustrating the exemplary operation of the reversing step. 
         FIG.  23 ( a )  is a front view schematically illustrating an exemplary operation of the reversing step and a second supporting step, and  FIG.  23 ( b )  is a plan view schematically illustrating the exemplary operation of the reversing step and the second supporting step. 
         FIG.  24 ( a )  is a front view schematically illustrating an exemplary operation of the second supporting step, and  FIG.  24 ( b )  is a plan view schematically illustrating the exemplary operation of the second supporting step. 
         FIG.  25 ( a )  is a front view schematically illustrating an exemplary operation of a second taking step, and  FIG.  25 ( b )  is a plan view schematically illustrating the exemplary operation of the second taking step. 
         FIG.  26 ( a )  is a front view schematically illustrating an exemplary operation of the second taking step, and  FIG.  26 ( b )  is a plan view schematically illustrating the exemplary operation of the second taking step. 
         FIG.  27 ( a )  is a front view schematically illustrating an exemplary operation of an unloading step, and  FIG.  27 ( b )  is a plan view schematically illustrating the exemplary operation of the unloading step. 
         FIGS.  28 ( a ) to  28 ( h )  are each a side view schematically illustrating an exemplary operation of the second taking step and the unloading step. 
         FIG.  29 ( a )  is a front view schematically illustrating an exemplary operation of a lowering step, and  FIG.  29 ( b )  is a plan view schematically illustrating the exemplary operation of the lowering step. 
         FIG.  30 ( a )  is a front view schematically illustrating an exemplary operation of a first moving step, and  FIG.  30 ( b )  is a plan view schematically illustrating the exemplary operation of the first moving step. 
         FIG.  31 ( a )  is a front view schematically illustrating an exemplary operation of the second moving step and a raising step, and  FIG.  31 ( b )  is a plan view schematically illustrating the exemplary operation of the second moving step and the raising step. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following describes a substrate treating apparatus of the present invention with reference to the drawings. 
       FIG.  1    is a plan view of the substrate treating apparatus according to one embodiment. A substrate treating apparatus  1  performs treatment on a substrate W. 
     Substrate W 
     The following firstly describes a substrate W treated by a substrate treating apparatus  1 .  FIG.  2 ( a )  is a side view of the substrate W.  FIG.  2 ( b )  is a plan view of the substrate W. Examples of the substrate W include a semiconductor wafer, a substrate for liquid crystal display, a substrate for organic electroluminescence (EL), a substrate for flat panel display (FPD), a substrate for optical display, a magnetic disk substrate, an optical disk substrate, a magneto-optical disk substrate, a substrate for photomask, and a solar cell substrate. 
     The following describes a basic shape of the substrate W. The substrate W has a thin flat shape. The substrate W may have a relatively small thickness. The thickness is, for example, 10 μm or more and 200 μm or less. However, the thickness is not limited to 10 μm or more and 200 μm or less. The thickness of the substrate W may be less than 10 μm. The thickness of the substrate W may be more than 200 μm. 
     The substrate W has a substantially circular shape in plan view. The substrate W may have a relatively large diameter. The diameter is, for example, 300 mm. However, the diameter of the substrate W is not limited to 300 mm. The diameter of the substrate W may be less than 300 mm or more than 300 mm, for example. 
     The substrates W has a first face W 1  and a second face W 2 . When the substrate W is in a horizontal posture, one of the first face W 1  and the second face W 2  is directed upward whereas the other of the first face W 1  and the second face W 2  is directed downward. Here, a face of the substrate W directed upward is referred to as a “top face WT” whereas a face of the substrate W directed downward is referred to as a “back face WB”. For example, when the first face W 1  corresponds to the top face WT, the second face W 2  corresponds to the back face WB. For example, when the substrate W is reversed, the first face W 1  changes from the top face WT to the back face WB whereas the second face W 2  changes from the back face WB to the top face WT. 
     The substrate W has a first area  3  where a semiconductor device is formed and a second area  4  where no semiconductor device is formed. The second area  4  is positioned at a periphery edge of the substrate W in plan view. The first area  3  is positioned inside of the second area  4  in plan view. Here, the first area  3  is referred to as a “main part  3 ”. The second area  4  is referred to as a “peripheral part  4 ”. 
     The following exemplarily describes a detailed shape of the substrate W. 
     As illustrated in  FIG.  3 ( a ) , the substrate W may a recess  5 .  FIG.  3 ( a )  is one example illustrating a sectional view of a shape of the substrate W. The recess  5  is formed, for example, by a grinding process. The recess  5  is formed, for example, by making the main part  3  recessed than the peripheral part  4 . When a semiconductor device is formed on the main part  3  of the first face W 1  and a semiconductor device is not formed on the main part  3  of the second face W 2 , for example, the recess  5  is formed not on the first face W 1  but on the second face W 2 . 
     Alternatively, as illustrated in  FIG.  3 ( b ) , the substrate W does not necessarily have a recess  5 .  FIG.  3 ( b )  is another example illustrating a sectional view of a shape of the substrate W. The first face W 1  and the second face W 2  may each be planar over the main part  3  and the peripheral part  4 . 
     The following exemplarily describes a configuration of the substrate W. 
     As illustrated in  FIG.  4 ( a ) , the substrate W may have a substrate body  6  and a protecting member  7 .  FIG.  4 ( a )  is one example illustrating a side view of a configuration of the substrate W. A semiconductor device is formed on the substrate body  6 . The substrate body  6  is, for example, a silicon wafer. The substrate body  6  may have the recess  5  described above. Alternatively, the substrate body  6  does not necessarily have the recess  5 . The protecting member  7  supports and protects the substrate W, for example. A semiconductor device is not formed on the protecting member  7 . The protecting member  7  is at least one selected from a plate, a coating, a tape, a sheet, and a film. The material of the protecting member  7  is, for example, glass or resin. The resin is, for example, synthetic resin. The protecting member  7  bonds to the substrate body  6 . For example, the protecting member  7  bonds to the substrate body  6  via an adhesive, not shown. 
     As illustrated in  FIG.  4 ( b ) , the substrate W may have a substrate body  6  and may not have a protecting member  7 .  FIG.  4 ( b )  is another example illustrating a side view of a configuration of the substrate W. The substrate W may be a substrate body  6  obtained by separating the protecting member  7  bonded to the substrate body  6 , for example. The adhesive used for boding of the substrate body  6  to the protecting member  7  may be attached to the substrate W, for example. 
     The substrate treating apparatus  1  performs a cleaning treatment to the substrate W described above, for example. The substrate treating apparatus  1  performs a removal treatment of removing the adhesive attached to the substrate W, for example. 
     Outline of Substrate Treating Apparatus 
     Reference is made to  FIG.  1   . An outline of the substrate treating apparatus  1  will now be described. 
     The substrate treating apparatus  1  includes an indexer  10 , and a treating block  20 . The treating block  20  is connected to the indexer  10 . The indexer  10  and the treating block  20  line up in a horizontal direction. The indexer  10  supplies a substrate W to the treating block  20 . The treating block  20  performs a treatment to the substrate W. The indexer  10  collects the substrate W from the treating block  20 . 
     In this specification, the horizontal direction in which the indexer  10  and the treating block  20  are arranged is referred to as a “front-back direction X” for convenience. One direction of the front-back direction X from the treating block  20  to the indexer  10  is referred to as a “forward direction”. The direction opposite to the forward direction is referred to as a “rearward direction”. A horizontal direction orthogonal to the front-back direction X is referred to as a “traverse direction Y”. Moreover, one direction of the transverse direction Y is referred to as a “rightward direction” appropriately. The direction opposite to rightward is referred to as “leftward”. A direction perpendicular relative to the horizontal direction is referred to as a “vertical direction Z”. When no distinction is particularly made among “forward”, “rearward”, “rightward”, and “leftward”, a simple term “lateral” is to be described. For reference, the drawings show front, rear, right, left, up, and down, as appropriate. 
     The indexer  10  includes a plurality of (e.g., four) carrier platforms  11 . The carrier platforms  11  line up in a transverse direction Y. The carrier platforms  11  each include one carrier C placed thereon. The carrier C accommodates a plurality of substrates W. When a substrate W is accommodated in the carrier C, the substrate W is in a horizontal posture. The carrier C is, for example, a front opening unified pod (FOUP). 
     The indexer  10  includes a transportation space  12 . The transportation space  12  is located behind the carrier platforms  11 . The transportation space  12  extends in the transverse direction Y. 
     The indexer  10  includes a transport mechanism  13 . The transport mechanism  13  is located in the transportation space  12 . The transport mechanism  13  is located behind the carrier platforms  11 . The transport mechanism  13  transports a substrate W. When a substrate W is supported by the transport mechanism  13 , the substrate W is in a horizontal posture. The transport mechanism  13  is accessible to the carriers C, each placed on the carrier platforms  11 . 
     The treating block  20  includes a transportation space  22 . The transportation space  22  extends in the front-back direction X. A front part of the transportation space  22  is in connection with the transportation space  12  of the indexer  10 . The transportation space  22  extends rearward from the transportation space  12 . The transportation space  22  is located at a central portion of the treating block  20  in the transverse direction Y. 
     Reference is made to  FIGS.  1  and  5   .  FIG.  5    is a left side view of a middle portion of the substrate treating apparatus  1  in the transverse direction Y. The treating block  20  includes a transport mechanism  23 . The transport mechanism  23  is located in the transportation space  22 . The transport mechanism  23  transports a substrate W. When a substrate W is supported by the transport mechanism  23 , the substrate W is in a horizontal posture. 
     The treating block  20  includes a plurality of (e.g., two) inversion units  24 . The inversion units  24  are located in the transportation space  22 . The inversion units  24  are arranged in a front portion of the transportation space  22 . The inversion units  24  are arranged forward of the transport mechanism  23 . The inversion units  24  each reverse a substrate W. 
     The inversion units  24  each have substantially the same configuration. Specifically, the inversion units  24  each include a supporting portion  25 . The supporting portion  25  supports a substrate W. When a substrate W is supported by the supporting portion  25 , the substrate W is in a horizontal posture. 
     The inversion unit  24  each include a reversing mechanism  26 . The reversing mechanism  26  receives the substrate W from the supporting portion  25 . The reversing mechanism  26  reverses the substrate W. The reversing mechanism  26  rotates the substrate W around a horizontal rotation axis A. The reversing mechanism  26  delivers the substrate W to the supporting portion  25 . 
     When a distinction is made among the inversion units  24 , they are referred to as inversion units  24   a  and  24   b . The supporting portion  25 , the reversing mechanism  26 , and the rotation axis A of the inversion unit  24   a  are referred to as a supporting portion  25   a , a reversing mechanism  26   a , and a rotation axis Aa, respectively, as appropriate. The supporting portion  25 , the reversing mechanism  26 , and the rotation axis A of the inversion unit  24   b  are referred to as a supporting portion  25   b , a reversing mechanism  26   b , and a rotation axis Ab, respectively, as appropriate. 
     Reference is made to  FIG.  5   . The treating block  20  includes a plurality of (e.g., two) substrate platforms  27 . The substrate platforms  27  are located in the transportation space  22 . The substrate platforms  27  are arranged in the front portion of the transportation space  22 . The substrate platforms  27  are located forward of the transport mechanism  23 . The substrate platforms  27  are located below the inversion units  24 . The substrate platforms  27  place one or more substrates W thereon. When a substrate W is placed on the substrate platform  27 , the substrate W is in a horizontal posture. 
     When a distinction is made among the substrate platforms  27 , they are referred to as substrate platforms  27   a  and  27   b.    
       FIG.  6 ( a )  is a front view of the substrate platform  27 .  FIG.  6 ( b )  is a plan view of the substrate platform  27 . The substrate platform  27  includes a wall  31  and a plurality of (e.g., two) shelves  32 . The shelves  32  are supported by the wall  31 . The shelves  32  are arranged to line up in the vertical direction Z. The shelves  32  each support one substrate W in a horizontal posture. 
     The shelves  32  each includes a first shelf  33  and a second shelf  34 . The first shelf  33  and the second shelf  34  are arranged at the same height position. The first shelf  33  and the second shelf  34  line up in the transverse direction Y. The first shelf  33  and the second shelf  34  each extend in horizontal direction (e.g., front-back direction X). The first shelf  33  contacts a first side portion of the substrate W. The second shelf  34  contacts a second side portion of the substrate W. 
     The shelf  32  also adjust a position of the substrate W in the horizontal direction. Specifically, the first shelf  33  includes a first slope face  33   a . The second shelf  34  includes a second slope face  34   a . The first slope face  33   a  and the second slope face  34   a  each contact an edge of the substrate W. For example, the first slope face  33   a  and the second slope face  34   a  are each inclined downward and radially inward of the substrate W supported by the shelf  32 . For example, a distance between the first slope face  33   a  and the second slope face  34   a  in the horizontal direction decreases downward. The first slope face  33   a  and the second slope face  34   a  guide the substrate W to a given position. 
     Reference is made to  FIG.  1   . The treating block  20  includes a plurality of treating units  28 . The treating units  28  are each adjacent to the transportation space  22 . Some of the treating units  28  is located rightward of the transportation space  22 . The other treating units  28  are located leftward of the transportation space  22 . 
       FIG.  7    is a left side view of a left part of the substrate treating apparatus  1 .  FIG.  7    illustrates the treating units  28  located leftward of the transportation space  22 . A plurality of treating units  28  line up in the front-back direction X and the vertical direction Z. For example, six treating units  28  are arranged in two rows in the front-back direction X and in three stages in the vertical direction Z. The treating units  28  located rightward of the transportation space  22  are arranged in the same manner that the treating units  28  located leftward of the transportation space  22  are arranged, which illustration is omitted. 
     The treating units  28  each perform a treatment on a substrate W individually. The treatment performed by the treating units  28  individually may be a cleaning treatment or an adhesive removal treatment, for example. The treating units  28  each perform a treatment to one substrate W at one time. The treating units  28  each treat a top face WT of the substrate W. 
     The treating unit  28  includes a substrate holder  36  and a rotation driving unit  37 . The substrate holder  36  holds one substrate W. When the substrate holder  36  holds a substrate W, the substrate W is in a horizontal posture. The rotation driving unit  37  is connected to the substrate holder  36 . The rotation driving unit  37  rotates the substrate holder  36 . Thereby, the substrate W held by the substrate holder  36  rotates integrally with the substrate holder  36 . The substrate W held by the substrate holder  36  rotates around a rotation axis parallel to the vertical direction Z. 
     Reference is made to  FIG.  1   . The treating unit  28  includes a nozzle  38 . The nozzle  38  dispenses a treatment liquid to the substrate W. The nozzle  38  dispenses a treatment liquid to the top face WT. The nozzle  38  is provided so as to be movable between a treating position and a retreating position.  FIG.  1    illustrates the nozzle  38  at the treating position by solid lines.  FIG.  1    illustrates the nozzle  38  at the retreating position by dotted lines.  FIG.  1    illustrates one substrate W held by one substrate holder  36 . The treating position is a position above the substrate W held by the substrate holder  36 . When the nozzle  38  is located at the treating position, the nozzle  38  overlaps the substrate W held by the substrate holder  36  in plan view. When the nozzle  38  is located at the retreating position, the nozzle  38  does not overlap the substrate W held by the substrate holder  36  in plan view. 
     The treating unit  28  includes a guard  39 . The guard  39  is located so as to surround the substrate holder  36  laterally. The guard  39  receives the treatment liquid. 
     The transport mechanism  23  is accessible to the inversion units  24 . The transport mechanism  23  is accessible to the supporting portion  25 . The transport mechanism  23  is accessible to the substrate platform  27 . The transport mechanism  23  is accessible to the shelf  32 . The transport mechanism  23  is accessible to the treating unit  28 . The transport mechanism  23  is accessible to the substrate holder  36 . 
     The transport mechanism  13  of the indexer  10  is accessible to the substrate platform  27 . On the other hand, the transport mechanism  13  does not access the inversion units  24 . 
     The substrate treating apparatus  1  includes a controller  29 . The controller  29  is located in the indexer  10 , for example. 
       FIG.  8    is a control block diagram of the substrate treating apparatus  1 . The controller  29  controls the transport mechanisms  13  and  23 , the inversion units  24 , and the treating units  28 . The controller  29  is communicably connected to the transport mechanisms  13  and  23 , the inversion units  24 , and the treating units  28 . 
     The controller  29  is implemented by a central processing unit (CPU) that performs various processes, a random-access memory (RAM) as a workspace of arithmetic processing, and a storage medium such as a fixed disk. The storage medium stores various kinds of information in advance. The information stored in the storage medium is, for example, information about operating conditions of the transport mechanisms  13  and  23 , the inversion units  24 , and the treating units  28 . The information stored in the storage medium is, for example, information to identify each of the substrates W. 
     The following describes one exemplary operation of the substrate treating apparatus  1  with reference to  FIG.  9   .  FIG.  9    schematically illustrates procedures of transporting one substrate W.  FIG.  9    schematically illustrates elements of the substrate treating apparatus  1  where the substrate passes. 
     It is assumed in the present exemplary operation that the elements of the substrate treating apparatus  1  each operate under control by the controller  29 . It is assumed that the first face W 1  corresponds to the back face WB in the carrier C on the carrier platform  11 . Briefly on the present exemplary operation, the substrate treating apparatus  1  performs treatment on the first face W 1 . The following describes the present exemplary operation. 
     A carrier C where substrates W are accommodated is placed on the carrier platform  11  (Step S 1 ). The transport mechanism  13  unloads a substrate W from the carrier C on the carrier platform  11  (Step S 2 ). The transport mechanism  13  transports the substrate W to the substrate platform  27   a  (Step S 3 ). The transport mechanism  13  places the substrate W on the shelf  32  of the substrate platform  27   a . The shelf  32  of the substrate platform  27   a  adjusts a position of the substrate W in the horizontal direction. The transport mechanism  23  receives the substrate W from the substrate platform  27   a  (Step S 4 ). The transport mechanism  23  takes the substrate W from the shelf  32  of the substrate platform  27   a . The transport mechanism  23  transports the substrate W to the inversion unit  24   a . The transport mechanism  23  transports the substrate W to the supporting portion  25   a  (Step S 5 ). The transport mechanism  23  delivers the substrate W to the supporting portion  25   a . The supporting portion  25   a  supports the substrate W. The reversing mechanism  26   a  receives the substrate W from the supporting portion  25   a  (Step S 6 ). The first face W 1  corresponds to the back face WB from when the carriers C is placed on the carrier platform  11  until when the reversing mechanism  26   a  receives the substrate W from the supporting portion  25   a.    
     The reversing mechanism  26   a  reverses the substrate W around a rotation axis Aa. The first face W 1  changes from the back face WB to the top face WT. 
     The reversing mechanism  26   a  delivers the substrate W to the supporting portion  25   a  (Step S 7 ). The supporting portion  25   a  supports the substrate W. The transport mechanism  23  receives the substrate W from the supporting portion  25   a  (Step S 8 ). The transport mechanism  23  unloads the substrate W from the inversion unit  24   a . The transport mechanism  23  transports the substrate W to the treating unit  28  (Step S 9 ). The transport mechanism  23  places the substrate W on the substrate holder  36 . The treating unit  28  performs a treatment on the substrate W. Specifically, the treating unit  28  supplies a treatment liquid to the top face WT of the substrate W held by the substrate holder  36  while rotating the substrate W held by the substrate holder  36 . The transport mechanism  23  takes the substrate W from the substrate holder  36  (Step S 10 ). The transport mechanism  23  unloads the substrate W from the treating unit  28 . The transport mechanism  23  transports the substrate W to the inversion unit  24   b . The transport mechanism  23  transports the substrate W to the supporting portion  25   b  (Step S 11 ). The transport mechanism  23  delivers the substrate W to the supporting portion  25   b . The supporting portion  25   b  supports the substrate W. The reversing mechanism  26   b  receives the substrate W from the supporting portion  25   b  (Step S 12 ). The first face W 1  of the substrate W corresponds to the top face WT from when the reversing mechanism  26   a  delivers the substrate W to the supporting portion  25   a  until when the reversing mechanism  26   b  receives the substrate W from the supporting portion  25   b.    
     The reversing mechanism  26   b  reverses the substrate W around a rotation axis Ab. The first face W 1  of the substrate W changes from the top face WT to the back face WB. 
     The reversing mechanism  26   b  delivers the substrate W to the supporting portion  25   b  (Step S 13 ). The supporting portion  25   b  supports the substrate W. The transport mechanism  23  receives the substrate W from the supporting portion  25   b  (Step S 14 ). The transport mechanism  23  unloads the substrate W from the inversion unit  24   b . The transport mechanism  23  delivers the substrate W to the substrate platform  27   b  (Step S 15 ). The transport mechanism  23  places the substrate W on the shelf  32  of the substrate platform  27   b . The shelf  32  of the substrate platform  27   b  adjusts a position of the substrate W in the horizontal direction. The transport mechanism  13  receives the substrate W from the substrate platform  27   b  (Step S 16 ). The transport mechanism  13  takes the substrate W from the shelf  32  of the substrate platform  27   b . The transport mechanism  13  loads the substrate W to the carrier C on the carrier platform  11  (Step S 17 ). The first face W 1  of the substrate W corresponds to the back face WB from when the reversing mechanism  26   b  delivers the substrate W to the supporting portion  25   b  until when the transport mechanism  13  loads the substrate W to the carrier C. 
     The following describes a configuration of the substrate treating apparatus  1  in more detail. 
     Indexer  10   
     The following describes a configuration of the transport mechanism  13 . 
     Reference is made to  FIG.  1   . The transport mechanism  13  includes a hand  14 . The hand  14  has a substantial U-shape in plan view, for example. The hand  14  supports one substrate W in a horizontal posture. 
       FIG.  5    illustrates a substrate W supported by the hand  14 . The hand  14  is located below the substrate W. The hand  14  contacts the substrate W. The hand  14  does not suck the substrate W. 
     The transport mechanism  13  includes a hand driving unit  15 . The hand driving unit  15  is connected to the hand  14 . The hand driving unit  15  moves the hand  14 . The hand driving unit  15  moves the hand  14  to the carrier C on the carrier platform  11 . The hand driving unit  15  moves the hand  14  to the substrate platform  27 . 
     The following describes a configuration of the hand driving unit  15 . The hand driving unit  15  includes a rail  15   a , a horizontally moving portion  15   b , a vertically moving portion  15   c , a rotator  15   d , and an advancing/retreating portion  15   e . The rail  15   a  is fixedly installed. The rail  15   a  is located at a bottom of the transportation space  12 . The rail  15   a  extends in the transverse direction Y. The horizontally moving portion  15   b  is supported by the rail  15   a . The horizontally moving portion  15   b  moves in the transverse direction Y with respect to the rail  15   a . The vertically moving portion  15   c  is supported by the horizontally moving portion  15   b . The vertically moving portion  15   c  moves in the vertical direction Z with respect to the horizontally moving portion  15   b . The rotator  15   d  is supported by the vertically moving portion  15   c . The rotator  15   d  rotates with respect to the vertically moving portion  15   c . The rotator  15   d  rotates around a rotation axis that passes the rotator  15   d  and is parallel to the vertical direction Z. The advancing/retreating portion  15   e  moves in the horizontal direction with respect to the rotator  15   d . The advancing/retreating portion  15   e  reciprocates in a horizontal direction defined by orientation of the rotator  15   d . The advancing/retreating portion  15   e  supports the hand  14 . The hand  14  is fixed to the advancing/retreating portion  15   e.    
     The hand driving unit  15  with such a configuration described above can translate the hand  14  in the vertical direction Z. The hand  14  can translate in any horizontal direction. The hand  14  is rotatable in a horizontal plane. 
     Reference is made to  FIG.  8   . The controller  29  controls the hand driving unit  15  of the transport mechanism  13 . The controller  29  is communicatively connected to the hand driving unit  15 . 
     Treating Block  20   
     The following describes a configuration of the transport mechanism  23  and the inversion unit  24 . 
     &lt;Transport Mechanism  23 &gt; 
     Reference is made to  FIGS.  1  and  5   . The transport mechanism  23  includes a hand  41 . The hand  41  holds one substrate W in a horizontal posture. 
     The hand  41  includes a first suction portion  42 . The first suction portion  42  sucks a substrate W. The hand  41  is referred to as a Bernoulli chuck, or a Bernoulli gripper. 
       FIG.  5    illustrates a substrate W sucked by the first suction portion  42 . The first suction portion  42  is located above the substrate W. The first suction portion  42  sucks the substrate W upward. 
     More specifically, when the first suction portion  42  sucks the substrate W, the first suction portion  42  blows gas to the substrate W from a position above the substrate W. The first suction portion  42  causes gas to flow over the top face WT. Gas flows over the top face WT, whereby the air pressure on the top face WT is less than the air pressure on the back face WB. That is, gas flows over the top face WT, whereby negative pressure is formed in the vicinity of the top face WT. In accordance with the Bernoulli&#39;s principle, an upward force acts on the substrate W. This causes the substrate W to be sucked upward. The substrate W is sucked toward the first suction portion  42 . However, the first suction portion  42  does not contact the substrate W sucked by the first suction portion  42 . The first suction portion  42  is spaced apart from the top face WT by a small gap. In such a manner as above, the first suction portion  42  sucks the substrate W without contacting the substrate W. 
     Reference is made to  FIGS.  1  and  5   . The transport mechanism  23  includes a hand driving unit  45 . The hand driving unit  45  is connected to the hand  41 . The hand driving unit  45  moves the hand  41 . That is, the hand driving unit  45  moves the first suction portion  42 . The hand driving unit  45  moves the hand  41  to the inversion unit  24 , the substrate platform  27 , and the treating unit  28 . 
     The following describes a configuration of the hand driving unit  45 . The hand driving unit  45  includes a strut  45   a , a vertically moving portion  45   b , a rotator  45   c , and an advancing/retreating portion  45   d . The strut  45   a  is fixedly located. The strut  45   a  extends in the vertical direction Z. The vertically moving portion  45   b  is supported by the strut  45   a . The vertically moving portion  45   b  moves in the vertical direction Z with respect to the strut  45   a . The rotator  45   c  is supported by the vertically moving portion  45   b . The rotator  45   c  rotates with respect to the vertically moving portion  45   b . The rotator  45   c  rotates around a rotation axis that passes the rotator  45   c  and is parallel to the vertical direction Z. The advancing/retreating portion  45   d  moves in the horizontal direction with respect to the rotator  45   c . The advancing/retreating portion  45   d  reciprocates in a horizontal direction defined by orientation of the rotator  45   c . The advancing/retreating portion  45   d  supports the hand  41 . 
     The hand driving unit  45  with such a configuration described above can translate the hand  41  in the vertical direction Z. The hand  41  can translate in any horizontal direction. The hand  41  is rotatable in a horizontal plane. 
     The hand driving unit  45  is one example of the transport driving unit in the present invention. The transport mechanism  23  is one example of the transport mechanism in the present invention. 
       FIG.  10    is a bottom view of the hand  41 .  FIGS.  11 ( a ),  11 ( b ), and  11 ( c )  are each a side view of the hand  41 . The following describes a configuration of the hand  41 . 
     The hand  41  includes a connecting portion  46 . The connecting portion  46  is fixed to the advancing/retreating portion  45   d.    
     The hand  41  includes a suction holder  47 . The suction holder  47  is fixed to the connecting portion  46 . The suction holder  47  extends in the horizontal direction from the connecting portion  46 . The suction holder  47  holds the first suction portion  42 . 
     The suction holder  47  includes two branches  47 A and  47 B, for example. The branches  47 A and  47 B are arranged at substantially the same height position. 
     The first suction portion  42  includes a plurality of (e.g., six) suction pads  43 . For example, three suction pads  43  are attached to the branch  47 A. The other three suction pads  43  are attached to the branch  47 B. 
     The suction pads  43  are each located to be dispersed over the substrate W sucked by the first suction portion  42  in plan view.  FIG.  10    illustrates the substrate W sucked by the first suction portion  42  by dotted lines.  FIG.  11 ( a )  illustrates the substrate W sucked by the first suction portion  42  by solid lines. 
     The suction pads  43  each blow gas. Each of the suction pads  43  has a cylindrical shape with a central axis that is parallel to the vertical direction Z. The suction pad  43  has a lower portion that is open downward. The suction pad  43  blows gas downward from a lower portion thereof. The suction pad  43  may form a swirling flow when the suction pad  43  blows gas. The suction pad  43  may discharge a swirling flow downward. Here, the swirling flow is an air flow that swirls inside the suction pad  43  about the central axis of the suction pad  43 , for example. 
     The transport mechanism  23  includes a gas feed channel  48 . The gas feed channel  48  is connected in communication with the first suction portion  42 . The gas feed channel  48  is connected in communication with each of the suction pads  43 . The gas feed channel  48  supplies gas to the first suction portion  42 . The first suction portion  42  blows gas supplied from the gas feed channel  48 . The gas supplied to the first suction portion  42  is, for example, a nitrogen gas or air. The gas supplied to the first suction portion  42  is, for example, a high-pressure gas or a compressed gas. 
     The transport mechanism  23  includes a suction adjusting unit  49 . The suction adjusting unit  49  is provided on the gas feed channel  48 . The suction adjusting unit  49  opens and closes the gas feed channel  48 . When the suction adjusting unit  49  opens the gas feed channel  48 , the gas feed channel  48  supplies gas to the first suction portion  42 . When the suction adjusting unit  49  closes the gas feed channel  48 , the gas feed channel  48  does not supply gas to the first suction portion  42 . Moreover, the suction adjusting unit  49  may change a flow rate of gas that the gas feed channel  48  supplies to the first suction portion  42 . For example, the suction adjusting unit  49  may adjust a channel sectional area of the gas feed channel  48 . The suction adjusting unit  49  includes one or more valves, for example. The suction adjusting unit  49  includes at least either an on-off valve or a flow rate regulating valve, for example. 
     The hand  41  includes a contact portion  51 . The contact portion  51  is fixed to the suction holder  47 . The contact portion  51  is located at a position overlapping the substrate W sucked by the first suction portion  42  in plan view. The contact portion  51  is positioned lower than the first suction portion  42 . When the first suction portion  42  sucks the substrate W, the contact portion  51  contacts the top face WT of the substrate W. The contact portion  51  contacts the top face WT, thereby suppressing horizontal movement of the substrate W with respect to the first suction portion  42 . That is, when the first suction portion  42  sucks the substrate W, the contact portion  51  keeps the substrate W at a suitable position with respect to the first suction portion  42 . 
     The hand  41  includes walls  52  and  53 . The walls  52  and  53  are fixed to the suction holder  47 . The walls  52  and  53  are located radially outward of the substrate W sucked by the first suction portion  42  in plan view. The walls  52  and  53  are located at a height position substantially same as that of the substrate W sucked by the first suction portion  42 . The walls  52  and  53  extend in the vertical direction Z. The walls  52  and  53  extend downward from the suction holder  47 . When the substrate W is located at a suitable position with respect to the first suction portion  42 , the walls  52  and  53  do not contact the substrate W. When the substrate W moves excessively in the horizontal direction with respect to the first suction portion  42 , the walls  52  and  53  contact the edge of the substrate W. Thereby, the walls  52  and  53  controls excessive displacement of the substrate W in the horizontal direction with respect to the first suction portion  42 . 
     The hand  41  includes a receiver  54 . The receiver  54  is located at a position lower than the substrate W sucked by the first suction portion  42 . 
     The receiver  54  is located at a drop-preventing position.  FIGS.  11 ( a ) and  11 ( b )  each illustrate a receiver  54  at the drop-preventing position. 
     When the receiver  54  is located at the drop-preventing position, the receiver  54  overlaps the substrate W sucked by the first suction portion  42  in plan view. For example, when the receiver  54  is located at the drop-preventing position, the receiver  54  overlaps a peripheral edge of the substrate W sucked by the first suction portion  42  in plan view. When the receiver  54  is located at the drop-preventing position, the receiver  54  can receive the substrate W. When the receiver  54  is located at the drop-preventing position, the receiver  54  prevents the substrate W from falling off the hand  41 . 
       FIG.  11 ( b )  illustrates the substrate W received by the receiver  54 . When the receiver  54  receives the substrate W, the substrate W is in a horizontal posture. 
     When the receiver  54  receives the substrate W, the receiver  54  contacts at least either the back face WB of the substrate W or the edge of the substrate W. When the receiver  54  receiving the substrate W, the receiver  54  allows the substrate W to move upward with respect to the receiver  54 . 
     The receiver  54  is movable to the retreating position.  FIG.  11 ( c )  illustrates a receiver  54  at the retreating position. 
     When the receiver  54  is located at the retreating position, the substrate W can move through the receiver  54  in the vertical direction Z. Accordingly, the substrate W can easily move, below the first suction portion  42 , between a position higher than the receiver  54  and a position lower than the receiver  54 .  FIG.  11 ( c )  illustrates a substrate W that is located below the first suction portion  42  and at a position higher than the receiver  54  by solid lines.  FIG.  11 ( c )  illustrates a substrate W that is located below the first suction portion  42  and at a position lower than the receiver  54  by dotted lines. Accordingly, when the receiver  54  is located at the retreating position, the first suction portion  42  can approach or move away from the substrate W easily. 
     The following describes a structure of the receiver  54 . The receiver  54  includes a first receiver  55  and a second receiver  56 . The first receiver  55  and a second receiver  56  are each located at a position lower than the substrate W sucked by the first suction portion  42 . The first receiver  55  is located at a height position substantially equal to that of the second receiver  56 . The first receiver  55  and the second receiver  56  are spaced apart from each other in the horizontal direction. The first receiver  55  and the second receiver  56  can approach and move away from each other in the horizontal direction. When the receiver  54  moves from the retreating position to the drop-preventing position, the first receiver  55  and the second receiver  56  approach each other, and a distance between the first receiver  55  and the second receiver  56  in the horizontal direction becomes small. When the second receiver  56  moves from the drop-preventing position to the retreating position, the first receiver  55  and the second receiver  56  move far away from each other, and the distance between the first receiver  55  and the second receiver  56  in the horizontal direction becomes large. 
     In the embodiment described above, the first receiver  55  is fixed to the suction holder  47 . Specifically, the first receiver  55  is fixed to a lower part of the wall  52 . The first receiver  55  extends from the wall  52  radially inward of the substrate W sucked by the first suction portion  42 . The second receiver  56  is movable in the horizontal direction with respect to the suction holder  47 .  FIG.  10    illustrates the second receiver  56  by solid lines when the receiver  54  is located at the retreating position.  FIG.  10    illustrates the second receiver  56  by dotted lines when the receiver  54  is located at the drop-preventing position. 
     The hand  41  includes a stay  57  and a receiver driving unit  58 . The stay  57  supports the second receiver  56 . The second receiver  56  is fixed to the stay  57 . The second receiver  56  extends from the stay  57  radially inward of the substrate W sucked by the first suction portion  42 . The receiver driving unit  58  is connected to the stay  57 . The receiver driving unit  58  is supported by the connecting portion  46  or the suction holder  47 . The receiver driving unit  58  moves the stay  57  with respect to the suction holder  47 . The receiver driving unit  58  moves the stay  57  in the horizontal direction. The second receiver  56  moves integrally with the stay  57 . When the stay  57  moves with respect to the suction holder  47 , the second receiver  56  moves with respect to the first receiver  55 . In such a manner as above, the receiver driving unit  58  moves the second receiver  56  with respect to the first receiver  55 . The receiver driving unit  58  moves the receiver  54  to the drop-preventing position and the retreating position. The receiver driving unit  58  is, for example, at least either an air cylinder or an electric motor, for example. 
     The stay  57  is located at substantially the same height position as those of the walls  52  and  53 . That is, the stay  57  is located at a height position substantially same as that of the substrate W sucked by the first suction portion  42 . The stay  57  extends in the vertical direction Z. The stay  57  has the same function as that of the walls  52  and  53 . The stay  57  controls excessive displacement of the substrate W in the horizontal direction with respect to the first suction portion  42 . 
     &lt;Inversion Unit  24 &gt; 
       FIG.  12    is a side view of the inversion unit  24 . The inversion unit  24  includes a housing  61 . The housing  61  has a substantial box shape. The housing  61  has a substrate transportation port  62 . The substrate transportation port  62  is formed in a rear wall of the housing  61 . A substrate W can pass through the substrate transportation port  62 . The substrate W can move between outside of the housing  61  and inside of the housing  61  via the substrate transportation port  62 . The hand  41  of the transport mechanism  23  can also pass through the substrate transportation port  62 . Here, the housing  61  has no substrate transportation port formed in a front wall thereof. Accordingly, the transport mechanism  13  is not accessible to the inversion units  24 . 
     The supporting portion  25  of the inversion unit  24  is located inside of the housing  61 . When the supporting portion  25  supports the substrate W, the supporting portion  25  contacts the substrate W. 
     The supporting portion  25  supports the substrate W from the below. When the supporting portion  25  supports the substrate W, the supporting portion  25  is located below the substrate W. The supporting portion  25  contacts at least either the back face WB of the substrate W or the edge of the substrate W. When the supporting portion  25  supports the substrate W, the supporting portion  25  allows the substrate W to move upward with respect to the supporting portion  25 . The supporting portion  25  does not suck the substrate W. 
     Reference is made to  FIGS.  12 ,  13 , and  14   .  FIG.  13    is a partial plan view of the inversion unit  24 .  FIG.  14    is a partial front view of the inversion unit  24 . The supporting portion  25  includes a plurality of (e.g., six) support pins  63 . The support pins  63  are each sufficiently smaller than the substrate W in plan view. The support pins  63  are located at the same height position. The support pins  63  are arranged on the edge of the substrate W supported by the supporting portion  25  in plan view. The support pins  63  each contact the substrate W. 
     More specifically, the support pins  63  each include a shaft  64  and a position adjusting unit  65 . The shaft  64  has an elongated bar shape. The shaft  64  extends in the vertical direction Z. The position adjusting unit  65  is connected to an upper end of the shaft  64 . The position adjusting unit  65  protrudes upward from the shaft  64 . The position adjusting unit  65  contacts the substrate W. 
     Reference is made to  FIG.  14   . The position adjusting unit  65  also adjusts a position of the substrate W in the horizontal direction. Specifically, the position adjusting unit  65  include a slope face  65   a . The slope face  65   a  contacts the edge of the substrate W. The slope face  65   a  is inclined downward and radially inward of the substrate W supported by the supporting portion  25 . In other words, the slope face  65   a  is inclined upward and radially outward of the substrate W supported by the supporting portion  25 . The slope face  65   a  guides the substrate W to a given position. 
       FIG.  14    shows the center J of the substrate W supported by the supporting portion  25 .  FIG.  14    further illustrates a central axis K. The central axis K is an imaginary line that passes through the center J and is parallel to the vertical direction Z. The radius direction corresponds to a direction orthogonal to the central axis K. The term radially inward is a direction approaching the central axis K in the radial direction. In other words, the term radially inward is a direction approaching the center J in the radial direction of the substrate W. The term radially outward is a direction moving away from the central axis K in the radial direction. In other words, the term radially outward is a direction moving far away from the center J in the radial direction of the substrate W. 
     Reference is made to  FIG.  12   . The inversion unit  24  includes a lifting base  66  and a lifting drive unit  67 . The lifting base  66  is located below the supporting portion  25 . The lifting base  66  supports the supporting portion  25 . The lifting base  66  is connected to the lower part of the supporting portion  25 . The lifting drive unit  67  is connected to the lifting base  66 . The lifting drive unit  67  is supported by the housing  61 . The lifting drive unit  67  moves the lifting base  66  with respect to the housing  61 . The lifting drive unit  67  moves the lifting base  66  in the vertical direction Z. When the lifting base  66  moves, the supporting portion  25  moves integrally with the lifting base  66 . Thereby, the supporting portion  25  moves with respect to the housing  61 . The supporting portion  25  moves in the vertical direction Z. The lifting drive unit  67  includes, for example, an air cylinder. 
     The lifting drive unit  67  moves the supporting portion  25  to a first support position PH and a second support position PL.  FIGS.  12  and  14    each illustrates the supporting portion  25  at the first support position PH by solid lines.  FIGS.  12  and  14    each illustrates the supporting portion  25  at the second support position PL by dotted lines. The second support position PL is lower than the first support position PH. Specifically, the supporting portion  25  at the second support position PL is located at a position lower than the supporting portion  25  at the first support position PH. 
     Reference is made to  FIG.  13   . The second support position PL is at the same position as the first support position PH in plan view. Specifically, the supporting portion  25  at the second support position PL is located at the same position as the supporting portion  25  at the first support position PH in plan view. Here, in  FIG.  13   , illustration of the lifting base  66  is omitted. 
     The lifting drive unit  67  brings the supporting portion  25  into rest at the first support position PH and the second support position PL. The lifting drive unit  67  does not bring the supporting portion  25  into rest at a position except the first support position PH and the second support position PL. The lifting drive unit  67  does not move the supporting portion  25  to a position higher than the first support position PH. The lifting drive unit  67  does not move the supporting portion  25  to a position lower than the second support position PL. 
     Reference is made to  FIG.  12   . The inversion unit  24  includes a substrate detector  69 . The substrate detector  69  is supported by the housing  61 . The substrate detector  69  detects the substrate W. For example, the substrate detector  69  detects whether or not the substrate W is supported by the supporting portion  25 . For example, the substrate detector  69  detects a position of the substrate W. 
     The reversing mechanism  26  of the inversion unit  24  includes a hand  71 . The hand  71  holds one substrate W. The hand  71  is located inside of the housing  61 . 
     The hand  71  includes a second suction portion  72 . The second suction portion  72  has a configuration substantially equal to that of the first suction portion  42 . The second suction portion  72  sucks a substrate W. The hand  71  is referred to as a Bernoulli chuck, or a Bernoulli gripper. 
     The second suction portion  72  sucks either a first face W 1  or the second face W 2  of the substrate W. For example, when the second suction portion  72  sucks the first face W 1  of the substrate W, the second suction portion  72  is located at a position facing the first face W 1  and blows gas to the first face W 1 . The second suction portion  72  causes gas to flow over the first face W 1 . Gas flows over the first face W 1 , whereby the air pressure on the first face W 1  is smaller than the air pressure on the second face W 2 . That is, gas flows over the first face W 1 , whereby negative pressure is formed in the vicinity of the first face W 1 . In accordance with the Bernoulli&#39;s principle, force toward the second suction portion  72  acts on the substrate W. Thereby, the substrate W is sucked toward the second suction portion  72 . However, the second suction portion  72  does not contact the substrate W sucked by the second suction portion  72 . The second suction portion  72  is spaced apart from the substrate W by a small gap. In such a manner as above, the second suction portion  72  sucks the substrate W without contacting the substrate W. 
     The hand  71  includes a suction holder  74 . The suction holder  74  holds the second suction portion  72 . 
     Reference is made to  FIG.  13   . The suction holder  74  includes a first branch  74 A and a second branch  74 B. The first branch  74 A and the second branch  74 B are spaced apart from each other. 
     The second suction portion  72  includes a third suction portion  72 A and a fourth suction portion  72 B. The third suction portion  72 A is held by the first branch  74 A. The fourth suction portion  72 B is held by the second branch  74 B. 
     The third suction portion  72 A includes a plurality of (e.g., three) suction pads  73 A. The suction pads  73 A are attached to the first branch  74 A. The fourth suction portion  72 B includes a plurality of (e.g., three) suction pads  73 B. The suction pads  73 B are attached to the second branch  74 B. The suction pads  73 A and  73 B have substantially the same configuration as the suction pad  43 . When no distinction is made between the suction pads  73 A and  73 B, they are referred to as a suction pad  73  as appropriate. 
     The reversing mechanism  26  includes a gas feed channel  75 . The gas feed channel  75  has a function similar to that of the gas feed channel  48 . The gas feed channel  75  is connected in communication with the second suction portion  72 . The gas feed channel  75  is connected in communication with the third suction portion  72 A and the fourth suction portion  72 B. The gas feed channel  75  is connected in communication with each of the suction pads  73 . The gas feed channel  75  supplies gas to the second suction portion  72 . The second suction portion  72  blows gas supplied from the gas feed channel  75 . The gas supplied to the second suction portion  72  is, for example, a nitrogen gas or air. The gas supplied to the second suction portion  72  is, for example, a high-pressure gas or a compressed gas. 
     The reversing mechanism  26  includes a suction adjusting unit  76 . The suction adjusting unit  76  has a function similar to that of the suction adjusting unit  49 . The suction adjusting unit  76  is provided on the gas feed channel  75 . The suction adjusting unit  76  opens and closes the gas feed channel  75 . When the suction adjusting unit  76  opens the gas feed channel  75 , the gas feed channel  75  supplies gas to the second suction portion  72 . When the suction adjusting unit  76  closes the gas feed channel  75 , the gas feed channel  75  does not supply gas to the second suction portion  72 . Moreover, the suction adjusting unit  76  may change a flow rate of gas that the gas feed channel  75  supplies to the second suction portion  72 . For example, the suction adjusting unit  76  may adjust a channel sectional area of the gas feed channel  75 . The suction adjusting unit  76  includes one or more valves, for example. The suction adjusting unit  76  includes at least either an on-off valve or a flow rate regulating valve, for example. 
     Reference is made to  FIG.  12   . The hand  71  includes a contact portion  77 . The contact portion  77  has a function similar to that of the contact portion  51 . The contact portion  77  is fixed to the suction holder  74 . When the second suction portion  72  sucks the substrate W, the contact portion  77  contacts the substrate W. The contact portion  77  contacts the substrate W, thereby suppressing displacement of the substrate W with respect to the second suction portion  72 . When the second suction portion  72  sucks the substrate W, the contact portion  77  keeps the substrate W at a suitable position with respect to the second suction portion  72 . 
     The hand  41  includes a wall  78 . The wall  78  has a function similar to those of the walls  52  and  53 . The wall  78  is fixed to the suction holder  74 . The wall  78  controls excessive displacement of the substrate W with respect to the second suction portion  72 . 
     The reversing mechanism  26  includes a hand driving unit  81 . The hand driving unit  81  is connected to the hand  71 . The hand driving unit  81  moves the hand  71 . 
     Specifically, the hand driving unit  81  rotates the hand  71  around the rotation axis A. The hand driving unit  81  widens and narrows a distance between the first branch  74 A and the second branch  74 B. Thereby, the hand driving unit  81  rotates the second suction portion  72  around the rotation axis A. The hand driving unit  81  widens and narrows a distance between the third suction portion  72 A and the fourth suction portion  72 B. 
     The following describes a configuration of the hand driving unit  81 . The hand driving unit  81  includes a rotation driving unit  82 , a rotation base  83 , and a movement driving unit  84 . The rotation driving unit  82  is supported by the housing  61 . The rotation driving unit  82  is located on a front wall of the housing  61 . The rotation driving unit  82  has a part located outside of the housing  61  and a part located inside of the housing  61 . The rotation base  83  is connected to the rotation driving unit  82 . The movement driving unit  84  is supported by the rotation base  83 . The movement driving unit  84  is connected to the hand  71 . The movement driving unit  84  connects the first branch  74 A and the second branch  74 B. The rotation base  83  and the movement driving unit  84  are located inside of the housing  61 . 
     The rotation driving unit  82  rotates the rotation base  83  with respect to the housing  61 . The rotation driving unit  82  rotates the rotation base  83  around a rotation axis A. When the rotation base  83  rotates, the movement driving unit  84  and the hand  71  rotate integrally with the rotation base  83 . In such a manner as above, the rotation driving unit  82  rotates the second suction portion  72 . The rotation driving unit  82  causes the second suction portion  72  to rotate with respect to the housing  61 . The second suction portion  72  rotates around the rotation axis A. 
     The movement driving unit  84  moves the first branch  74 A with respect to the rotation base  83 . The movement driving unit  84  moves the second branch  74 B with respect to the rotation base  83 . Thereby, the movement driving unit  84  widens and narrows a gap between the first branch  74 A and the second branch  74 B. 
     The rotation driving unit  82  includes, for example, a rotary actuator. The movement driving unit  84  includes, for example, an air cylinder. For example, the movement driving unit  84  may include a first air cylinder corresponding to the first branch  74 A and a second air cylinder corresponding to the second branch  74 B. Alternatively, the movement driving unit  84  may include a common air cylinder corresponding to both the first branch  74 A and the second branch  74 B. Moreover, the movement driving unit  84  may include at least either a first link mechanism or a second link mechanism. The first link mechanism connects the air cylinder to the first branch  74 A. The second link mechanism connects the air cylinder to the second branch  74 B. 
     The hand driving unit  81  moves the second suction portion  72  to a first position P 1 , a second position P 2 , and a third position P 3 .  FIG.  12    illustrates the second suction portion  72  at the first position P 1  by solid lines.  FIG.  12    illustrates the second suction portion  72  at the second position P 2  by dotted lines.  FIG.  13    illustrates the second suction portion  72  at the first position P 1  by solid lines.  FIG.  13    illustrates the second suction portion  72  at the third position P 3  by dotted lines.  FIG.  14    illustrates the second suction portion  72  at the first position P 1  by solid lines.  FIG.  14    illustrates the second suction portion  72  at the second position P 2  and the third position P 3  by dotted lines. 
     Reference is made to  FIG.  12   . The rotation driving unit  82  moves the second suction portion  72  to the first position P 1  and the second position P 2 . Specifically, the rotation driving unit  82  rotates the second suction portion  72  around the rotation axis A, whereby the second suction portion  72  moves between the first position P 1  and the second position P 2 . More specifically, the rotation driving unit  82  half-rotates the second suction portion  72 . The rotation driving unit  82  rotates the second suction portion  72  by 180 degrees. When the second suction portion  72  moves between the first position P 1  and the second position P 2 , the movement driving unit  84  does not change the distance between the first branch  74 A and the second branch  74 B. 
     Here, the position of the rotation axis A with respect to the housing  61  is stable. The rotation axis A is horizontal. The rotation axis A is parallel to the front-back direction X, for example. 
     Reference is made to  FIG.  13   . The movement driving unit  84  moves the second suction portion  72  to the first position P 1  and the third position P 3 . Specifically, the movement driving unit  84  changes the distance between the first branch  74 A and the second branch  74 B, whereby the second suction portion  72  moves between the first position P 1  and the third position P 3 . Specifically, the movement driving unit  84  increases the distance between the first branch  74 A and the second branch  74 B, whereby the second suction portion  72  moves from the first position P 1  to the third position P 3 . The movement driving unit  84  decreases the distance between the first branch  74 A and the second branch  74 B, whereby the second suction portion  72  moves from the third position P 3  to the first position P 1 . The distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  is located at the third position P 3  is larger than distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  is located at the first position P 1 . When the second suction portion  72  moves between the first position P 1  and the third position P 3 , the rotation driving unit  82  does not rotate the second suction portion  72  around the rotation axis A. 
     Here, the distance between the first branch  74 A and the second branch  74 B is constant when the second suction portion  72  rotates around the rotation axis A. The distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  rotates around the rotation axis A is equal to the distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  is located at the first position P 1 . The distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  rotates around the rotation axis A is smaller than the distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  is located at the third position P 3 . 
     The following describes a relationship between the rotation axis A and the first position P 1 , the second position P 2 , and the third position P 3 . 
     Reference is made to  FIG.  12   . The rotation axis A is lower than the first position P 1 . The rotation axis A is higher than the second position P 2 . The second position P 2  is lower than the first position P 1 . Specifically, the rotation axis A is located at a position lower than the second suction portion  72  at the first position P 1 . The rotation axis A is located at a position higher than the second suction portion  72  at the second position P 2 . The second suction portion  72  at the second position P 2  is located at a position lower than the second suction portion  72  at the first position P 1 . 
     Reference is made to  FIG.  14   . The third position P 3  is higher than the rotation axis A. The third position P 3  is substantially equal in level to the first position P 1 . The third position P 3  is higher than the second position. Specifically, the second suction portion  72  at the third position P 3  is located at a position higher than the rotation axis A. The second suction portion  72  at the third position P 3  is located at a position substantially equal in level to the second suction portion  72  at the first position P 1 . The second suction portion  72  at the third position P 3  is located at a position higher than the second suction portion  72  at the second position P 2 . 
     When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  can blow gas downward. When the second suction portion  72  is located at the first position P 1 , the third suction portion  72 A and the fourth suction portion  72 B are arranged at the same height position. When the second suction portion  72  is located at the first position P 1 , the contact portion  77  is lower than the second suction portion  72  (see  FIG.  12   ). 
     When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  can blow gas upward. When the second suction portion  72  is located at the second position P 2 , the third suction portion  72 A and the fourth suction portion  72 B are arranged at the same height position. When the second suction portion  72  is located at the second position P 2 , the contact portion  77  is higher than the second suction portion  72  (see  FIG.  12   ). 
     When the second suction portion  72  is located at the third position P 3 , the second suction portion  72  can blow gas downward. However, in the present embodiment, the second suction portion  72  blows no gas when the second suction portion  72  is located at the third position P 3 . When the second suction portion  72  is located at the third position P 3 , the third suction portion  72 A and the fourth suction portion  72 B are arranged at the same height position. 
     Reference is made to  FIG.  13   . When the second suction portion  72  is located at the first position P 1 , the rotation axis A is located between the third suction portion  72 A and the fourth suction portion  72 B in plan view. When the second suction portion  72  is located at the first position P 1 , the third suction portion  72 A and the fourth suction portion  72 B are arranged at line symmetric positions with respect to the rotation axis A in plan view. 
     The second position P 2  overlaps the first position P 1  in plan view, which illustration is omitted. The second position P 2  is located below the first position P 1 . Specifically, the second suction portion  72  at the second position P 2  is located at a position equal to the second suction portion  72  at the first position P 1  in plan view. The second suction portion  72  at the second position P 2  is located below the second suction portion  72  at the first position P 1 . Accordingly, when the second suction portion  72  is located at the second position P 2 , the rotation axis A is located between the third suction portion  72 A and the fourth suction portion  72 B in plan view. When the second suction portion  72  is located at the second position P 2 , the third suction portion  72 A and the fourth suction portion  72 B are arranged in an axial symmetric manner with respect to the rotation axis A in plan view. 
     When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  overlaps the substrate W supported by the supporting portion  25  in plan view. When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is located more radially inward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is located to be dispersed over the substrate W sucked by the second suction portion  72  in plan view. When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is located, for example, at a central portion of the substrate W supported by the supporting portion  25  in plan view. Likewise, when the second suction portion  72  is located at the second position P 2 , the second suction portion  72  overlaps the substrate W supported by the supporting portion  25  in plan view. When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located more radially inward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located to be dispersed over the substrate W sucked by the second suction portion  72  in plan view. When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located, for example, at the central portion of the substrate W supported by the supporting portion  25  in plan view. 
     When the second suction portion  72  is located at the third position P 3 , the rotation axis A is located between the third suction portion  72 A and the fourth suction portion  72 B in plan view. When the second suction portion  72  is located at the third position P 3 , the third suction portion  72 A and the fourth suction portion  72 B are arranged at line symmetric positions with respect to the rotation axis A in plan view. 
     When the second suction portion  72  moves from the first position P 1  to the third position P 3 , the first branch  74 A and the second branch  74 B each move far away from the rotation axis A in plan view. When the second suction portion  72  moves from the third position P 3  to the first position P 1 , the first branch  74 A and the second branch  74 B each approach the rotation axis A in plan view. 
     When the second suction portion  72  moves between the first position P 1  and the third position P 3 , the first branch  74 A and the second branch  74 B each translate in the horizontal direction orthogonal to the rotation axis A. The horizontal direction orthogonal to the rotation axis A is, for example, the transverse direction Y. 
     When the second suction portion  72  is located at the third position P 3 , the second suction portion  72  does not overlap the substrate W supported by the supporting portion  25  in plan view. When the second suction portion  72  is located at the third position P 3 , the second suction portion  72  does not overlap the supporting portion  25  in plan view. When the second suction portion  72  is located at the third position P 3 , the second suction portion  72  is located more radially outward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. When the second suction portion  72  is located at the third position P 3 , the second suction portion  72  does not interfere with the transport mechanism  23 . 
     When the second suction portion  72  is located at the third position P 3 , also the suction holder  74  does not overlap the substrate W supported by the supporting portion  25  in plan view. When the second suction portion  72  is located at the third position P 3 , also the suction holder  74  does not overlap the supporting portion  25  in plan view. When the second suction portion  72  is located at the third position P 3 , also the suction holder  74  is located more radially outward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. When the second suction portion  72  is located at the third position P 3 , also the suction holder  74  does not interfere with the transport mechanism  23 . 
     The following describes a relationship between the rotation axis A and the first position P 1 , the second position P 2 , the first support position PH and the second support position PL. 
     The first position P 1  is higher than the first support position PH. The first position P 1  is higher than the second support position PL. The second position P 2  is located at the level substantially equal to that of the first support position PH. The second position P 2  overlaps the first support position PH in side view. The second position P 2  is higher than the second support position PL. The rotation axis A overlaps the first support position PH in side view. The rotation axis A is higher than the second support position PL. Specifically, the second suction portion  72  at the first position P 1  is located at a position higher than the supporting portion  25  at the first support position PH. The second suction portion  72  at the first position P 1  is located at a position higher than the supporting portion  25  at the second support position PL. The second suction portion  72  at the second position P 2  is located at a position substantially equal in level to the supporting portion  25  at the first support position PH. The second suction portion  72  at the second position P 2  overlaps the supporting portion  25  at the first support position PH in side view. The second suction portion  72  at the second position P 2  is located at a position higher than the supporting portion  25  at the second support position PL. The rotation axis A overlaps the supporting portion  25  at the first support position PH in side view. The rotation axis A is located at a position higher than the supporting portion  25  at the second support position PL. 
       FIG.  15    is a partial front view of the inversion unit  24 .  FIG.  15    illustrates a substrate WP 1  sucked by the second suction portion  72  at the first position P 1 .  FIG.  15    illustrates a substrate WP 2  sucked by the second suction portion  72  at the second position P 2 .  FIG.  15    illustrates a substrate WPH supported by the supporting portion  25  at the first support position PH.  FIG.  15    illustrates a substrate WPL supported by the supporting portion  25  at the second support position PL. Note that, in the present embodiment, the supporting portion  25  does not support the substrate W at the second support position PL. 
     When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is located above the substrate WP 1 . The second suction portion  72  sucks the substrate WP 1  upward. The substrate WP 1  is in a horizontal posture. The second suction portion  72  does not contact the substrate WP 1 . The contact portion  77  contacts the substrate WP 1  (specifically, top face WT). The contact portion  77  is located above the substrate WP 1 . 
     When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located below the substrate WP 2 . The second suction portion  72  sucks the substrate WP 2  downward. The substrate WP 2  is in a horizontal posture. The second suction portion  72  does not contact the substrate WP 2 . The contact portion  77  contacts the substrate WP 2  (specifically, back face WB). The contact portion  77  is located below the substrate WP 2 . 
     When the second suction portion  72  at the second position P 2  stops sucking the substrate WP 2 , the hand  71  (contact portion  77 ) supports the substrate W at the same position as the substrate WP 2 . When the second suction portion  72  does not suck the substrate W at the second position P 2 , the second suction portion  72  allows the substrate W, supported by the hand  71 , to move upward with respect to the hand  71 . 
     The height position of the substrate WP 1  is higher than the height position of the substrate WP 2 . The height position of the substrate WPH is higher than the height position of the substrate WPL. 
     The height position of the substrate WP 1  is higher than the height position of the substrate WPH. The height position of the substrate WPH is higher than the height position of the substrate WP 2 . The height position of the substrate WP 2  is higher than the height position of the substrate WPL. 
     The first position P 1  is higher than the substrate WPH. Specifically, when the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is positioned higher than the substrate WPH. 
     More specifically, when the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is positioned slightly higher than the substrate WPH. The second suction portion  72  at the first position P 1  is located in the vicinity of the top face WT of the substrate WPH. Accordingly, when the second suction portion  72  is located at the first position P 1 , the second suction portion  72  can easily float the substrate W from the position of the substrate WPH to the position of the substrate WP 1 . 
     The second position P 2  is lower than the substrate WPH. The second position P 2  is higher than the substrate WPL. Specifically, the second suction portion  72  at the second position P 2  is positioned lower than the substrate WPH. The second suction portion  72  at the second position P 2  is positioned higher than the substrate WPL. 
     The first support position PH is lower than the substrate WP 1 . The first support position PH overlaps the substrate WP 2  in side view. The second support position PL is lower than the substrate WP 2 . Specifically, the supporting portion  25  at the first support position PH is positioned lower than the substrate WP 1 . The supporting portion  25  at the first support position PH overlaps the substrate WP 2  in side view. The supporting portion  25  at the second support position PL is positioned lower than the substrate WP 2 . 
     The substrate WP 1  is located at the same position as that of the substrate WP 2  in plan view, which illustration is omitted. The substrate WPH is located at the same position as that of the substrate WPL in plan view. The substrates WP 1  and WP 2  are located at the same position as that of the substrates WPH and WPL in plan view. Consequently, the substrate WP 1  is located above the substrate WPH. The substrate WPH is located above the substrate WP 2 . The substrate WP 2  is located above the substrate WPL. 
     Reference is made to  FIG.  8   . The controller  29  controls the hand driving unit  45 , the suction adjusting unit  49 , and the receiver driving unit  58  of the transport mechanism  23 . The controller  29  controls the lifting drive unit  67  of the inversion unit  24 . The controller  29  obtains detection results of the substrate detector  69  of the inversion unit  24 . The controller  29  controls the suction adjusting unit  76  and the hand driving unit  81  of the reversing mechanism  26 . The controller  29  controls the rotation driving unit  82  and the movement driving unit  84  of the hand driving unit  81 . The controller  29  is communicatively connected to these components. 
     Exemplary Operation of Substrate Treating Apparatus  1   
     The following describes exemplary operations of the transport mechanism  23  and the inversion unit  24  in detail. Specifically, exemplary operations in Steps S 4  to S 8  and Steps S 10  to S 14  illustrated in  FIG.  9    is to be described in more detail. 
       FIG.  16    is a flowchart showing procedures of an exemplary operation of reversing a substrate W. It is assumed in the following exemplary operation that the elements of the substrate treating apparatus  1  each operate under control by the controller  29 . 
     &lt;Step S 21 : Transporting Step&gt; 
     The transport mechanism  23  transports a substrate W to the supporting portion  25 . 
       FIGS.  17 ( a ),  17 ( b ), and  17 ( c )  are each a plan view schematically illustrating an exemplary operation of a transporting step. In  FIGS.  17 ( a ),  17 ( b ), and  17 ( c ) , illustration of the hand driving unit  45  and the lifting base  66  is omitted. 
     Reference is made to  FIG.  17 ( a ) . The hand  41  supports the substrate W. The first suction portion  42  sucks the substrate W. The supporting portion  25  does not support a substrate W. Moreover, the hand  71  does not support a substrate W. Furthermore, the second suction portion  72  does not suck a substrate W. The second suction portion  72  is located at the third position P 3 . 
     Reference is made to  FIG.  17 ( b ) . The hand driving unit  45  moves the hand  41  (first suction portion  42 ) to the supporting portion  25 . Thereby, the hand  41  moves from outside of the housing  61  through the substrate transportation port  62  to inside of the housing  61 . The first suction portion  42  moves to the supporting portion  25  while sucking the substrate W. 
     The first suction portion  42  and the substrate W reach a position above the supporting portion  25 . In the transporting step, the second suction portion  72  is at rest at the third position P 3 . Accordingly, the second suction portion  72  does not interfere with the transport mechanism  23 . Moreover, the suction holder  74  does not interfere with the transport mechanism  23 . That is, the hand  71  does not interfere with the transport mechanism  23 . 
     &lt;Step S 22 : First Supporting Step&gt; 
     Reference is made to  FIG.  17 ( b ) . The transport mechanism  23  passes the substrate W to the supporting portion  25 . The supporting portion  25  receives the substrate W from the transport mechanism  23 . The supporting portion  25  supports the substrate W in a horizontal posture. 
     Reference is now made to  FIG.  17 ( c ) . The first suction portion  42  moves apart from the position above the supporting portion  25  while not sucking the substrate W. Specifically, the hand  41  moves from inside of the housing  61  to outside of the housing  61 . The supporting portion  25  supports a substrate W. The second suction portion  72  is located at the third position P 3 . Moreover, the second suction portion  72  does not suck a substrate W. 
     Also in the first supporting step, the second suction portion  72  is at rest at the third position P 3 . Accordingly, the second suction portion  72  does not interfere with the transport mechanism  23  also in the first supporting step. The suction holder  74  does not interfere with the transport mechanism  23  also in the first supporting step. 
     The following again describes the above transporting step and the first supporting step with reference to  FIGS.  18 ( a ) to  18 ( h ) .  FIGS.  18 ( a ) to  18 ( h )  are each a side view schematically illustrating an exemplary operation of the transporting step and the first supporting step. 
     Reference is now made to  FIG.  18 ( a ) . The hand  41  is located more rearward than the supporting portion  25 . The first suction portion  42  is located above the substrate W. The first suction portion  42  causes gas to flow over the top face WT of the substrate W and sucks the substrate W upward. The substrate W is in a horizontal posture. The receiver  54  is in the drop-preventing position. The supporting portion  25  is located at the first support position PH. 
     Reference is now made to  FIG.  18 ( b ) . The hand driving unit  45  moves the hand  41  forward. The first suction portion  42  moves to the supporting portion  25  while sucking the substrate W. The first suction portion  42  and the substrate W sucked by the first suction portion  42  are located above the supporting portion  25 . The receiver  44  is positioned higher than the supporting portion  25 . 
     Reference is now made to  FIG.  18 ( c ) . The suction adjusting unit  49  stops supplying gas to the first suction portion  42 . The first suction portion  42  stops blow of gas. The first suction portion  42  stops sucking the substrate W. The substrate W falls downward. The substrate W moves downward with respect to the first suction portion  42 . The receiver  54  receives the substrate W. The receiver  54  supports the substrate W in a horizontal posture. The substrate W supported by the receiver  54  is located above the supporting portion  25 . 
     Reference is now made to  FIG.  18 ( d ) . The hand driving unit  45  moves the hand  41  slightly downward. The receiver  54  moves downward while supporting the substrate W. The receiver  54  delivers the substrate W to the supporting portion  25 . The supporting portion  25  receives the substrate W from the receiver  54  at the first support position PH. The receiver  54  moves to a position lower than the substrate W supported by the supporting portion  25 . The receiver  54  separates from the substrate W. 
     The position adjusting unit  65  adjusts a position of the substrate W in the horizontal direction, which illustration is omitted. Specifically, the slope face  65   a  contacts the edge of the substrate W and guides the substrate W to a given position. Then, the supporting portion  25  supports the substrate W in a horizontal posture. 
     Reference is now made to  FIG.  18 ( e ) . The receiver driving unit  58  moves the receiver  54  from the drop-preventing position to the retreating position. The second receiver  56  moves far away from the first receiver  55 . The second receiver  56  moves rearward. As a result, the second receiver  56  is positioned more rearward than the substrate W supported by the supporting portion  25 . The second receiver  56  does not overlap the substrate W supported by the supporting portion  25  in plan view. 
     Reference is now made to  FIG.  18 ( f ) . The hand driving unit  45  moves the hand  41  slightly forward. The first receiver  55  and the second receiver  56  move forward. As a result, the first receiver  55  is positioned more forward than the substrate W supported by the supporting portion  25 . Neither the first receiver  55  nor the second receiver  56  overlaps the substrate W supported by the supporting portion  25  in plan view. 
     Reference is now made to  FIG.  18 ( g ) . The hand driving unit  45  moves the hand  41  upward. The receiver  54  moves from a position lower than the substrate W supported by the supporting portion  25  to a position higher than the substrate W supported by the supporting portion  25 . At this time, the first receiver  55  passes through a position in front of the substrate W supported by the supporting portion  25 . The second receiver  56  passes through a position behind the substrate W supported by the supporting portion  25 . The substrate W passes between the first receiver  55  and the second receiver  56 , and moves away from the first suction portion  42 . 
     Reference is now made to  FIG.  18 ( h ) . The hand driving unit  45  moves the hand  41  rearward. The first suction portion  42  moves apart from the position above the supporting portion  25  while not sucking the substrate W. 
     As described above, the supporting portion  25  is at rest at the first support position PH in the first supporting step. Also in the transporting step, the supporting portion  25  is at rest at the first support position PH. 
     &lt;Step S 23 &gt; First Substrate Detecting Step 
     The substrate detector  69  detects a substrate W. The substrate detector  69  outputs the detection results of the substrate detector  69  to the controller  29 . The controller  29  determines whether or not the substrate W is placed at a predetermined position in accordance with the detection results of the substrate detector  69 . If the controller  29  determines that the substrate W is placed at the predetermined position, the process proceeds to Step S 24 . If the controller  29  does not determine that the substrate W is placed at the predetermined position, the process does not proceed to Step S 24 . In this case, an abnormal process is executed. The abnormal process includes, for example, returning to Step S 21 . The abnormal process includes, for example, informing a user that an abnormality has occurred. 
     &lt;Step S 24 : First Taking Step&gt; 
     The supporting portion  25  delivers a substrate W to the reversing mechanism  26 . The reversing mechanism  26  takes the substrate W from the supporting portion  25 . 
       FIGS.  19 ( a ) and  19 ( b ),  20 ( a ) and  20 ( b ), and  21 ( a ) and  21 ( b )  are each schematically illustrating an exemplary operation of the first taking step.  FIGS.  19 ( a ) ,  20 ( a ), and  21 ( a ) are each a partial front view of the inversion unit  24 .  FIGS.  19 ( b ),  20 ( b ), and  21 ( b )  are each a partial plan view of the inversion unit  24 . In each of the above drawings, illustration of the hand driving unit  81  and the like is omitted. 
     Reference is now made to  FIGS.  19 ( a ) and  19 ( b ) . The second suction portion  72  is located at the third position P 3 . The second suction portion  72  does not suck a substrate W. The supporting portion  25  is located at the first support position PH. The supporting portion  25  supports the substrate W. The substrate W is in a horizontal posture. 
     Reference is now made to  FIGS.  20 ( a ) and  20 ( b ) . The movement driving unit  84  moves the second suction portion  72  from the third position P 3  to the first position P 1 . When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is positioned above the substrate W supported by the supporting portion  25 . 
     Reference is now made to  FIGS.  21 ( a ) and  21 ( b ) . The second suction portion  72  starts sucking the substrate W. Specifically, the suction adjusting unit  76  supplies gas to the second suction portion  72 . The second suction portion  72  blows gas downward. The second suction portion  72  blow gas to the top face WT. The second suction portion  72  causes gas to flow over the top face WT of the substrate W and sucks the substrate W upward. The substrate W floats upward from the supporting portion  25 . The substrate W separates from the supporting portion  25 . The supporting portion  25  delivers the substrate W to the reversing mechanism  26  at the first support position PH. The reversing mechanism  26  receives the substrate W from the supporting portion  25 . The reversing mechanism  26  supports the substrate W. The substrate W is in a horizontal posture. 
     The supporting portion  25  is at rest at the first support position PH in the first taking step. 
     &lt;Step S 25 &gt; Reversing Step 
     The reversing mechanism  26  inverts a substrate W. 
       FIGS.  22 ( a ) and  22 ( b ), and  23 ( a ) and  23 ( b )  are each schematically illustrating an exemplary operation of the reversing step.  FIGS.  22 ( a ) and  23 ( a )  are each a partial front view of the inversion unit  24 .  FIGS.  22 ( b ) and  23 ( b )  are each a partial plan view of the inversion unit  24 . 
     Reference is now made to  FIGS.  22 ( a ) and  22 ( b ) . The second suction portion  72  is located above the substrate W. The second suction portion  72  sucks the substrate W. The substrate W is in a horizontal posture. The lifting drive unit  67  moves the supporting portion  25  from the first support position PH to the second support position PL. 
     Reference is now made to  FIGS.  23 ( a ) and  23 ( b ) . The supporting portion  25  is located at the second support position PL. The rotation driving unit  82  rotates the second suction portion  72  around the rotation axis A. The second suction portion  72  half-rotates while sucking the substrate W. The second suction portion  72  rotates by 180 degrees while sucking the substrate W. The second suction portion  72  moves from the first position P 1  to the second position P 2  while sucking the substrate W. The substrate W sucked by the second suction portion  72  also rotates around the rotation axis A. The substrate W is reversed. 
     When the substrate W is reversed, the second suction portion  72  is moved from a position above the substrate W to a position below the substrate W. When the substrate W is reversed, the face of the substrate W sucked by the second suction portion  72  changes from the top face WT to the back face WB. 
     When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located below the substrate W. The substrate W is in a horizontal posture. 
     &lt;Step S 26 : Second Supporting Step&gt; 
     The reversing mechanism  26  delivers the substrate W to the supporting portion  25 . The supporting portion  25  receives the substrate W from the reversing mechanism  26 . The supporting portion  25  supports the substrate W in a horizontal posture. 
     Reference is now made to  FIGS.  23 ( a ) and  23 ( b ) . The second suction portion  72  stays at the second position P 2 . The second suction portion  72  stops sucking the substrate W. Specifically, the suction adjusting unit  76  stops supplying gas to the second suction portion  72 . The second suction portion  72  stops blow of gas. The substrate W is brought into a state of merely being placed on the hand  71  (contact portion  77 ). The substrate W is in a horizontal posture. The second suction portion  72  allows the substrate W to move upward. 
       FIGS.  24 ( a ) and  24 ( b )  each schematically illustrate an exemplary operation of the second supporting step.  FIG.  24 ( a )  is a partial front view of the inversion unit  24 .  FIG.  24 ( b )  is a partial plan view of the inversion unit  24 . 
     The second suction portion  72  is located at the second position P 2 . The second suction portion  72  is located below the substrate W. The second suction portion  72  does not suck the substrate W. The lifting drive unit  67  moves the supporting portion  25  from the second support position PL to the first support position PH. The supporting portion  25  contacts the substrate W on the hand  71 . Moreover, the supporting portion  25  lifts the substrate W upward. The substrate W moves upward with respect to the reversing mechanism  26 . The substrate W separates from the reversing mechanism  26 . The reversing mechanism  26  passes the substrate W to the supporting portion  25 . 
     The position adjusting unit  65  adjusts a position of the substrate W in the horizontal direction, which illustration is omitted. Specifically, the slope face  65   a  contacts the edge of the substrate W and guides the substrate W to a given position. 
     The supporting portion  25  supports the substrate W at the first support position PH. The substrate W is in a horizontal posture. 
     In the second supporting step, the second suction portion  72  is at rest at the second position P 2 . That is, the second suction portion  72  stays below the substrate W in the second supporting step. When the supporting portion  25  is located at the first support position PH, the supporting portion  25  surrounds the second suction portion  72  laterally. 
     &lt;Step S 27 &gt; Second Substrate Detecting Step 
     The substrate detector  69  detects a substrate W. The substrate detector  69  outputs the detection results of the substrate detector  69  to the controller  29 . The controller  29  determines whether or not the substrate W is placed at a predetermined position in accordance with the detection results of the substrate detector  69 . If the controller  29  determines that the substrate W is placed at the predetermined position, the process proceeds to Step S 28 . If the controller  29  does not determine that the substrate W is placed at the predetermined position, the process does not proceed to Step S 28 . In this case, an abnormal process is executed. The abnormal process includes, for example, informing a user that an abnormality has occurred. 
     &lt;Step S 28 : Second Taking Step&gt; 
     The supporting portion  25  delivers a substrate W to the transport mechanism  23 . The transport mechanism  23  takes the substrate W from the supporting portion  25 . 
       FIGS.  25 ( a ),  25 ( b ),  26 ( a ), and  26 ( b )  each schematically illustrate an exemplary operation of the second taking step.  FIGS.  25 ( a ) and  26 ( a )  are each a partial front view of the inversion unit  24  and the transport mechanism  23 .  FIGS.  25 ( b ) and  26 ( b )  are each a partial plan view of the inversion unit  24  and the transport mechanism  23 . 
     Reference is now made to  FIGS.  25 ( a ) and  25 ( b ) . The supporting portion  25  supports the substrate W at the first support position PH. The second suction portion  72  stays at the second position P 2 . The first suction portion  42  moves to a position above the supporting portion  25  while not sucking the substrate W. The first suction portion  42  is located above the substrate W supported by the supporting portion  25 . 
     Reference is now made to  FIGS.  26 ( a ) and  26 ( b ) . The first suction portion  42  starts sucking the substrate W. The first suction portion  42  sucks the substrate W, supported by the supporting portion  25 , upward. The substrate W floats upward from the supporting portion  25 . The substrate W separates from the supporting portion  25 . The supporting portion  25  passes the substrate W to the transport mechanism  23  at the first support position PH. The transport mechanism  23  supports the substrate W. The substrate W is in a horizontal posture. 
     The supporting portion  25  is at rest at the first support position PH in the second taking step. In the second taking step, the second suction portion  72  is at rest at the second position P 2 . 
     The second suction portion  72  is at rest at the second position P 2  during a period from the second supporting step to the second taking step. The second suction portion  72  does not move from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . The supporting portion  25  surrounds the second suction portion  72  laterally from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . 
     &lt;Step S 29 : Unloading Step&gt; 
     The first suction portion  42  moves apart from the position above the supporting portion  25  while sucking the substrate W. 
     Reference is now made to  FIGS.  26 ( a ),  26 ( b ),  27 ( a ), and  27 ( b ) .  FIGS.  27 ( a ) and  27 ( b )  each schematically illustrate an exemplary operation of the unloading step.  FIG.  27 ( a )  is a partial front view of the inversion unit  24 .  FIG.  27 ( b )  is a partial plan view of the inversion unit  24 . For example, the transport mechanism  23  unloads the substrate W from the inversion unit  24 . Specifically, the first suction portion  42  and the substrate W move from inside of the housing  61  to outside of the housing  61 . Moreover, the transport mechanism  23  transports the substrate W to the treating unit  28  or the substrate platform  27 . 
     The following again describes the above second taking step and the unloading step with reference to  FIGS.  28 ( a ) to  28 ( h ) .  FIGS.  28 ( a ) to  28 ( h )  are each a side view schematically illustrating an exemplary operation of the second taking step and the unloading step. 
     Reference is now made to  FIG.  28 ( a ) . The hand  41  is located more rearward than the supporting portion  25 . The first suction portion  42  does not suck a substrate W. The receiver  44  is located at the retreating position. The supporting portion  25  is located at the first support position PH. The supporting portion  25  supports a substrate W. The substrate W is in a horizontal posture. The second suction portion  72  is located at the second position P 2 . Moreover, the second suction portion  72  does not suck a substrate W. 
     Reference is now made to  FIG.  28 ( b ) . The first suction portion  42  moves to the supporting portion  25 . The first suction portion  42  is positioned above the supporting portion  25 . The first suction portion  42  is located above the substrate W supported by the supporting portion  25 . The receiver  44  is positioned higher than the supporting portion  25 . The receiver  54  does not overlap the substrate W supported by the supporting portion  25  in plan view. The first receiver  55  is positioned more forward than the substrate W supported by the supporting portion  25 . The second receiver  56  is positioned more rearward than the substrate W supported by the supporting portion  25 . 
     Reference is now made to  FIG.  28 ( c ) . The hand  41  moves slightly downward. The receiver  54  moves from a position higher than the substrate W supported by the supporting portion  25  to a position lower than the substrate W supported by the supporting portion  25 . The receiver  54  moves downward to a position lower than the upper end of the supporting portion  25 . The substrate W supported by the supporting portion  25  passes between the first receiver  55  and the second receiver  56 . The first suction portion  42  approaches the top face WT of the substrate W supported by the supporting portion  25 . 
     Reference is now made to  FIG.  28 ( d ) . The hand  41  moves slightly rearward. The first receiver  55  and the second receiver  56  move rearward. As a result, the first receiver  55  is positioned below the substrate W supported by the supporting portion  25 . The first receiver  55  overlaps the substrate W supported by the supporting portion  25  in plan view. 
     Reference is now made to  FIG.  28 ( e ) . The receiver  54  moves to the drop-preventing position. Specifically, the second receiver  56  approaches the first receiver  55 . The second receiver  56  moves forward. As a result, the second receiver  56  is positioned below the substrate W supported by the supporting portion  25  in plan view. Both the first receiver  55  and the second receiver  56  overlap the substrate W supported by the supporting portion  25  in plan view. 
     Reference is now made to  FIG.  28 ( f ) . The first suction portion  42  is located above the substrate W supported by the supporting portion  25 . The first suction portion  42  starts sucking the substrate W. Specifically, the first suction portion  42  blows gas to the top face WT. The first suction portion  42  causes gas to flow over the top face WT of the substrate W and sucks the substrate W upward. The substrate W floats upward from the supporting portion  25 . The substrate W separates from the supporting portion  25 . The supporting portion  25  delivers the substrate W to the transport mechanism  23  at the first support position PH. The transport mechanism  23  receives the substrate W from the supporting portion  25 . The transport mechanism  23  supports the substrate W. The substrate W is in a horizontal posture. 
     Reference is now made to  FIG.  28 ( g ) . The hand  41  moves upward while the first suction portion  42  sucks the substrate W. The receiver  54  moves from a position lower than the upper end of the supporting portion  25  to a position higher than the upper end of the supporting portion  25 . 
     Reference is now made to  FIG.  28 ( h ) . The hand  41  moves rearward. The first suction portion  42  moves apart from the position above the supporting portion  25  while sucking the substrate W. 
     As described above, the supporting portion  25  is at rest at the first support position PH in the second taking step. In the second taking step, the second suction portion  72  is at rest at the second position P 2 . Also in the unloading step, the supporting portion  25  is at rest at the first support position PH. Also in the unloading step, the second suction portion  72  is at rest at the second position P 2 . 
     &lt;Step S 30 : Retreating Step&gt; 
     The retreating step is performed after the second taking step. That is, the retreating step is performed after the supporting portion  25  delivers a substrate W to the transport mechanism  23 . In the retreating step, the second suction portion  72  moves from the second position P 2  to the third position P 3 . Specifically, the second suction portion  72  moves from the second position P 2  to the first position P 1 . Subsequently, the second suction portion  72  moves from the first position P 1  to the third position P 3 . The retreating step includes a lowering step, a first moving step, a second moving step, and a raising step. The first moving step is performed after the lowering step. The second moving step and the raising step are performed after the first moving step. 
     &lt;Step S 31 : Lowering Step&gt; 
     Reference is now made to  FIGS.  29 ( a ) and  29 ( b ) .  FIG.  29 ( a )  is a front view schematically illustrating an exemplary operation of the lowering step.  FIG.  29 ( b )  is a plan view schematically illustrating an exemplary operation of the lowering step. The second suction portion  72  is located at the second position P 2 . Moreover, the second suction portion  72  does not suck a substrate W. The supporting portion  25  does not support a substrate W. The supporting portion  25  moves from the first support position PH to the second support position PL. 
     &lt;Step S 32 : First Moving Step&gt; 
     Reference is now made to  FIGS.  30 ( a ) and  30 ( b ) .  FIG.  30 ( a )  is a side view schematically illustrating an exemplary operation of the first moving step.  FIG.  30 ( b )  is a plan view schematically illustrating an exemplary operation of the first moving step. The supporting portion  25  is located at the second support position PL. The second suction portion  72  rotates around the rotation axis A. The second suction portion  72  moves from the second position P 2  to the first position P 1 . 
     &lt;Step S 33 : Second Moving Step&gt; 
     Reference is made to  FIGS.  31 ( a ) and  31 ( b ) .  FIG.  31 ( a )  is a front view schematically illustrating an exemplary operation of the second moving step and the raising step.  FIG.  31 ( b )  is a plan view schematically illustrating an exemplary operation of the second moving step and the raising step. The second suction portion  72  moves from the first position P 1  to the third position P 3 . 
     &lt;Step S 34 : Raising Step&gt; 
     Reference is made to  FIGS.  31 ( a ) and  31 ( b ) . The supporting portion  25  moves from the second support position PL to the first support position PH. 
     Here, a period of the raising step may fall on a period of the second moving step. For example, the raising step and the second moving step may be performed at the same time. Alternatively, a period of the raising step may not fall on a period of the second moving step. For example, the raising step may be performed after the second moving step. For example, the second moving step may be performed after the raising step. 
     After the retreating step, the procedure returns to step S 21  and a transporting step is performed. 
     Effect of Embodiment 
     The substrate treating apparatus  1  includes the transport mechanism  23  configured to transport the substrates W. The transport mechanism  23  includes the first suction portion  42 . The first suction portion  42  sucks the substrate W without contacting the substrate W. Accordingly, the transport mechanism  23  can support the substrate W suitably. For example, the transport mechanism  23  can support the substrate W suitably even if the substrate W is easy to bend. For example, the transport mechanism  23  can support the substrate W suitably even if the substrate W itself has relatively small rigidity. 
     The transport mechanism  23  includes the hand driving unit  45 . The hand driving unit  45  moves the first suction portion  42 . Accordingly, the transport mechanism  23  can suitably transport the substrate W sucked by the first suction portion  42 . 
     The substrate treating apparatus  1  includes the reversing mechanism  26 . The reversing mechanism  26  includes the second suction portion  72 . The second suction portion  72  sucks the substrate W without contacting the substrate W. Accordingly, the reversing mechanism  26  can support the substrate W suitably. For example, the reversing mechanism  26  can support the substrate W suitably even if the substrate W is easy to bend. For example, the reversing mechanism  26  can support the substrate W suitably even if the substrate W itself has relatively small rigidity. 
     The reversing mechanism  26  includes the rotation driving unit  82 . The rotation driving unit  82  rotates the second suction portion  72  around the rotation axis A. Accordingly, the reversing mechanism  26  can suitably reverse the substrate W sucked by the second suction portion  72 . 
     The substrate treating apparatus  1  includes the supporting portion  25 . The supporting portion  25  contacts and supports the substrate W. The transport mechanism  23  transports a substrate W to the supporting portion  25 . The reversing mechanism  26  receives the substrate W from the supporting portion  25 . As described above, the transport mechanism  23  does not directly deliver the substrate W to the reversing mechanism  26  when transporting the substrate W to the reversing mechanism  26 . The transport mechanism  23  indirectly delivers the substrate W via the supporting portion  25  to the reversing mechanism  26  when transporting the substrate W to the reversing mechanism  26 . Accordingly, the second suction portion  72  can suitably suck the substrate W supported by the supporting portion  25 . Consequently, the reversing mechanism  26  can receive the substrate W from the supporting portion  25  suitably. 
     The supporting portion  25  supports the substrate W in a horizontal posture. Accordingly, the second suction portion  72  can more suitably suck the substrate W supported by the supporting portion  25 . Consequently, the reversing mechanism  26  can receive the substrate W from the supporting portion  25  more suitably. 
     When the transport mechanism  23  transports a substrate W to the supporting portion  25 , the first suction portion  42  is positioned above the substrate W. Accordingly, the transport mechanism  23  can deliver the substrate W to the supporting portion  25  suitably. 
     When the reversing mechanism  26  receives the substrate W from the supporting portion  25 , the second suction portion  72  is located above the substrate W supported by the supporting portion  25  and sucks the substrate W upward while causing gas to flow along the top face WT of the substrate W. Consequently, the reversing mechanism  26  can receive the substrate W from the supporting portion  25  suitably. 
     As described above, the substrate treating apparatus  1  can reverse the substrate W suitably. 
     The supporting portion  25  includes the position adjusting unit  65 . The position adjusting unit  65  adjusts a position of the substrate W in the horizontal direction. Accordingly, when the supporting portion  25  supports the substrate W, the substrate W is located at an appropriate position. Consequently, the second suction portion  72  can suitably suck the substrate W supported by the supporting portion  25 . The reversing mechanism  26  can receive the substrate W from the supporting portion  25  suitably. 
     Since the supporting portion  25  includes the position adjusting unit  65 , the first suction portion  42  can also suitably suck the substrate W supported by the supporting portion  25 . Consequently, the transport mechanism  23  can receive the substrate W from the supporting portion  25  suitably. 
     As described above, the first suction portion  42  and the second suction portion  72  suck a substrate W without contacting the substrate W. Accordingly, it is particularly important for the first suction portion  42  and the second suction portion  72  that the substrate W be located at the appropriate position when the first suction portion  42  and the second suction portion  72  suck a substrate W. 
     The position adjusting unit  65  include the slope face  65   a . The slope face  65   a  contacts the edge of the substrate W. The slope face  65   a  is inclined downward and radially inward of the substrate W supported by the supporting portion  25 . Accordingly, the position adjusting unit  65  can guide the substrate W to a given position suitably. 
     When the reversing mechanism  26  reverses the substrate W, the second suction portion  72  is moved from a position above the substrate W to a position below the substrate W. Accordingly, the reversing mechanism  26  can reverse the substrate W suitably. 
     When the reversing mechanism  26  delivers the substrate W to the supporting portion  25 , the second suction portion  72  is positioned below the substrate W and does not suck the substrate W. Accordingly, when the reversing mechanism  26  delivers the substrate W to the supporting portion  25 , the reversing mechanism  26  allows the substrate W to move upward with respect to the reversing mechanism  26 . Accordingly, the reversing mechanism  26  can deliver the substrate W to the supporting portion  25  suitably. 
     The second suction portion  72  is at rest from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . That is, the second suction portion  72  does not move from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . Accordingly, the supporting portion  25  can deliver the substrate W to the transport mechanism  23  rapidly after the reversing mechanism  26  delivers the substrate W to the supporting portion  25 . That is, a period from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23  can be shortened easily. This achieves suitably enhanced throughput of the substrate treating apparatus  1 . For example, the number of substrates W capable of undergoing treatment per unit time by the substrate treating apparatus  1  can be increased suitably. 
     The rotation driving unit  82  moves the second suction portion  72  to the first position P 1  by rotating the second suction portion  72  around the rotation axis A. When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  blows gas downward. Accordingly, when the second suction portion  72  is located at the first position P 1 , the second suction portion  72  can suitably suck the substrate W, located below the second suction portion  72 , upward. 
     The rotation driving unit  82  moves the second suction portion  72  to the second position P 2  by rotating the second suction portion  72  around the rotation axis A. When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  blows gas upward. Accordingly, when the second suction portion  72  is located at the second position P 2 , the second suction portion  72  can suitably suck the substrate W, located above the second suction portion  72 , downward. 
     The rotation axis A is located at a position lower than the second suction portion  72  at the first position P 1 . Accordingly, the second suction portion  72  at the first position P 1  is located at a position higher than the second suction portion  72  at the second position P 2 . Consequently, when the second suction portion  72  is located at the first position P 1 , the second suction portion  72  can be located above the substrate W easily. As a result, when the second suction portion  72  is located at the first position P 1 , the reversing mechanism  26  can suitably receive the substrate W from the supporting portion  25 . 
     On the other hand, the second suction portion  72  at the second position P 2  is located at a position lower than the second suction portion  72  at the first position P 1 . Consequently, when the second suction portion  72  is located at the second position P 2 , the second suction portion  72  can be located below the substrate W easily. As a result, when the second suction portion  72  is located at the second position P 2 , the reversing mechanism  26  can suitably deliver the substrate W to the supporting portion  25 . 
     The second suction portion  72  is moved from the first position P 1  to the second position P 2 , whereby the reversing mechanism  26  reverses the substrate W while lowering the height position of the substrate W. Consequently, when the second suction portion  72  is located at the second position P 2 , the reversing mechanism  26  can deliver the substrate W to the supporting portion  25  more easily. 
     When the reversing mechanism  26  delivers the substrate W to the supporting portion  25 , the second suction portion  72  is located at the second position P 2  and does not suck the substrate W. Accordingly, when the reversing mechanism  26  delivers the substrate W to the supporting portion  25 , the reversing mechanism  26  allows the substrate W to move upward with respect to the reversing mechanism  26 . Consequently, the reversing mechanism  26  can deliver the substrate W to the supporting portion  25  suitably. 
     The second suction portion  72  is kept at the second position P 2  from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . Accordingly, the supporting portion  25  can deliver the substrate W to the transport mechanism  23  rapidly after the reversing mechanism  26  delivers the substrate W to the supporting portion  25 . This achieves suitably enhanced throughput of the substrate treating apparatus  1 . 
     When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is located more radially inward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. Accordingly, the second suction portion  72  can apply an upward force to the central portion of the substrate W. As a result, the second suction portion  72  can suck the substrate W more suitably. 
     When the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located more radially inward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. Accordingly, the second suction portion  72  can apply a downward force to the central portion of the substrate W. As a result, the second suction portion  72  can suck the substrate W more suitably. 
     The substrate treating apparatus  1  provided with the second suction portion  72  needs especially a long time for retreating the second suction portion  72 . That is because, when the second suction portion  72  is located at the second position P 2 , the second suction portion  72  is located more radially inward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. Accordingly, a movement distance between the second position P 2  and the third position P 3  is relatively long, for example. A movement time of the second suction portion  72  between the second position P 2  and the third position P 3  is relatively long, for example. If the second suction portion  72  retreats from the second position P 2  before the supporting portion  25  delivers the substrate W to the transport mechanism  23 , a timing should be delayed remarkably when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . As described above in the present embodiment, the second suction portion  72  is kept at the second position P 2  from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . Accordingly, this can appropriately suppress delay in timing at which the supporting portion  25  delivers the substrate W to the transport mechanism  23 . Such an effect is particularly large for the substrate treating apparatus  1  provided with the second suction portion  72 . 
     Here in the present embodiment, the supporting portion  25  is located laterally of the second suction portion  72  from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . Accordingly, the second suction portion  72  is prohibited from retreating from the second position P 2  from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . That is because the second suction portion  72  may interfere with the supporting portion  25 . Moreover, the second suction portion  72  is located below the substrate W supported by the supporting portion  25  from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . Accordingly, the supporting portion  25  is prohibited from moving downward from the first support position P 1  from when the reversing mechanism  26  delivers the substrate W to the supporting portion  25  until when the supporting portion  25  delivers the substrate W to the transport mechanism  23 . That is because the substrate W supported by the supporting portion  25  may interfere with the second suction portion  72 . 
     The substrate treating apparatus  1  includes the lifting drive unit  67 . The lifting drive unit  67  moves the supporting portion  25  between the first support position PH and the second support position PL. The second support position PL is lower than the first support position PH. Accordingly, the supporting portion  25  can move upward and downward suitably. 
     When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is positioned higher than the substrate WPH. Consequently, when the second suction portion  72  is located at the first position P 1 , the second suction portion  72  can be located above the substrate WPH easily. As a result, when the second suction portion  72  is located at the first position P 1 , the reversing mechanism  26  can receive the substrate W from the supporting portion  25  easily. 
     The height position of the substrate WP 2  is lower than the height position of the substrate WPH and higher than the height position of the substrate WPL. Accordingly, when the second suction portion  72  is located at the second position P 2 , the supporting portion  25  can suitably receive the substrate W from the reversing mechanism  26  by moving from the second support position PL to the first support position PH. That is, when the second suction portion  72  is located at the second position P 2 , the reversing mechanism  26  can suitably deliver the substrate W to the supporting portion  25 . 
     When the transport mechanism  23  delivers the substrate W to the supporting portion  25 , the supporting portion  25  is located at the first support position PH. When the reversing mechanism  26  receives the substrate W from the supporting portion  25 , the supporting portion  25  is located at the first support position PH. When the reversing mechanism  26  reverses the substrate W, the supporting portion  25  is located at the second support position PL. When the reversing mechanism  26  delivers the substrate W to the supporting portion  25 , the supporting portion  25  moves from the second support position PL to the first support position PH. In such a manner as above, the supporting portion  25  is only located at two positions (specifically, first support position PH and second support position PL). In other words, the lifting drive unit  67  does not necessarily move the supporting portion  25  to three or more positions. Specifically, the lifting drive unit  67  does not necessarily move the supporting portion  25  to a position except the first support position PH and the second support position PL. For example, the lifting drive unit  67  does not necessarily move the supporting portion  25  to a position higher than the first support position PH. For example, the lifting drive unit  67  does not necessarily move the supporting portion  25  to a position lower than the second support position PL. This achieves a simplified configuration of the lifting drive unit  67 . For example, the lifting drive unit  67  can be realized without any electric motor, for example. In addition, operation of the supporting portion  25  can be simplified. 
     Moreover, when the transport mechanism  23  receives the substrate W from the supporting portion  25 , the supporting portion  25  is located at the first support position PH. This achieves a more simplified configuration of the lifting drive unit  67 . Operation of the supporting portion  25  can be much simplified. 
     The reversing mechanism  26  includes the movement driving unit  84 . The movement driving unit  84  moves the second suction portion  72  from the first position P 1  to the third position P 3 . Here, the third position P 3  is a position of the second suction portion  72  where the second suction portion  72  does not interfere with the transport mechanism  23 . When the transport mechanism  23  delivers the substrate W to the supporting portion  25 , the second suction portion  72  is located at the third position P 3 . This can appropriately prevent interference of the second suction portion  72  with the transport mechanism  23  when the transport mechanism  23  delivers the substrate W to the supporting portion  25 . 
     When the second suction portion  72  is located at the third position P 3 , the second suction portion  72  is located more radially outward of the substrate W supported by the supporting portion  25  than the supporting portion  25  in plan view. This can ensure that interference of the second suction portion  72  with the transport mechanism  23  is prevented when the second suction portion  72  is located at the third position P 3 . This can also ensure that interference of the second suction portion  72  with the supporting portion  25  is prevented when the second suction portion  72  is located at the third position P 3 . 
     The reversing mechanism  26  includes the first branch  74 A and the second branch  74 B. The first branch  74 A is coupled to the movement driving unit  84 . The second branch  74 B is coupled to the movement driving unit  84 . The second suction portion  72  includes a third suction portion  72 A and a fourth suction portion  72 B. The third suction portion  72 A is held by the first branch  74 A. The fourth suction portion  72 B is held by the second branch  74 B. The movement driving unit  84  widens and narrows a gap between the first branch  74 A and the second branch  74 B. The movement driving unit  84  increases the gap between the first branch  74 A and the second branch  74 B, thereby moving the second suction portion  72  from the first position P 1  to the third position P 3 . In such a manner as above, the movement driving unit  84  changes relative positions of the third suction portion  72 A and the fourth suction portion  72 B. This can effectively retreat the third suction portion  72 A and the fourth suction portion  72 B individually. That is, this can appropriately suppress a moving amount of the second suction portion  72  when the second suction portion  72  is moved from the first position P 1  to the third position P 3 . Accordingly, the movement driving unit  84  can move the second suction portion  72  from the first position P 1  to the third position P 3  easily. Moreover, this can effectively decrease a movable area of the second suction portion  72  when the second suction portion  72  is moved from the first position P 1  to the third position P 3 . This allows appropriate suppression in upsizing of the reversing mechanism  26 . 
     When the second suction portion  72  is located at the first position P 1 , the rotation axis A is located so as to pass between the first branch  74 A and the second branch  74 B in plan view. Also, when the second suction portion  72  is located at the third position P 3 , the rotation axis A is located so as to pass between the first branch  74 A and the second branch  74 B in plan view. When the second suction portion  72  are moved from the first position P 1  to the third position P 3 , the first branch  74 A and the second branch  74 B each move away from the rotation axis A in plan view. When the second suction portion  72  moves from the third position P 3  to the first position P 1 , the first branch  74 A and the second branch  74 B each approach the rotation axis A in plan view. In such a manner as above, the movement driving unit  84  moves the third suction portion  72 A and the fourth suction portion  72 B individually. Specifically, the movement driving unit  84  moves the third suction portion  72 A and the fourth suction portion  72 B in a direction opposite to each other. For example, when the second suction portion  72  moves from the first position P 1  to the third position P 3 , the movement driving unit  84  moves the third suction portion  72 A rightward and the fourth suction portion  72 B leftward. For example, when the second suction portion  72  moves from the third position P 3  to the first position P 1 , the movement driving unit  84  moves the third suction portion  72 A leftward and the fourth suction portion  72 B rightward. This can suppress a moving amount of the second suction portion  72  more appropriately when the second suction portion  72  is moved between the first position P 1  and the third position P 3 . Accordingly, the movement driving unit  84  can move the second suction portion  72  between the first position P 1  and the third position P 3  more easily. Moreover, this can more effectively decrease a movable area of the second suction portion  72  when the second suction portion  72  is moved from the first position P 1  to the third position P 3 . This allows more appropriate suppression in upsizing of the reversing mechanism  26 . 
     The distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  rotates around the rotation axis A is smaller than the distance between the first branch  74 A and the second branch  74 B when the second suction portion  72  is located at the third position P 3 . This can effectively decrease movable areas of the second suction portion  72  and the suction holder  74  when the second suction portion  72  rotates around the rotation axis A. This allows appropriate suppression in upsizing of the reversing mechanism  26 . 
     The substrate reversing method for reversing a substrate includes the transporting step (Step S 21 ). In the transporting step, the transport mechanism  23  transports the substrate to the supporting portion  25 . In the transporting step, the first suction portion  42  is located above the substrate W. In the transporting step, the first suction portion  42  sucks the substrate W upward by causing gas to flow over the top face WT of the substrate W. Consequently, the transport mechanism  23  can support the substrate W appropriately in the transporting step. 
     In the transporting step, the first suction portion  42  moves to the supporting portion  25  while sucking the substrate W. Consequently, the transport mechanism  23  can transport the substrate W appropriately to the supporting portion  25  in the transporting step. 
     The substrate reversing method includes the first supporting step (Step S 22 ). The first supporting step is performed after the transporting step. In the first supporting step, the supporting portion  25  receives the substrate W from the transport mechanism  23 . As described above, the first suction portion  42  is located above the substrate W in the transporting step. Accordingly, in the first supporting step, the supporting portion  25  can receive the substrate from the transport mechanism  23  appropriately. 
     The substrate reversing method includes the first taking step (Step S 24 ). The first taking step is performed after the first supporting step. In the first taking step, the reversing mechanism  26  takes the substrate W from the supporting portion  25 . In the first taking step, the second suction portion  72  is located at the first position P 1 . That is, the second suction portion  72  is positioned above the substrate W supported by the supporting portion  25 . In the first taking step, the second suction portion  72  sucks the substrate W upward by causing gas to flow over the top face WT of the substrate W. Accordingly, in the first taking step, the reversing mechanism  26  can take the substrate W from the supporting portion  25  suitably. 
     In the first supporting step, the supporting portion  25  supports the substrate W in a horizontal posture. Accordingly, the second suction portion  72  can suitably suck the substrate W supported by the supporting portion  25  in the first taking step. Consequently, in the first taking step, the reversing mechanism  26  can take the substrate W from the supporting portion  25  suitably. 
     As described above, the substrate reversing method includes the first supporting step, and thus the transport mechanism  23  delivers the substrate W to the supporting portion  25  and the reversing mechanism  26  takes the substrate W from the supporting portion  25 . In this manner, the reversing mechanism  26  indirectly receives the substrate W from the transport mechanism  23  via the supporting portion  25 . The reversing mechanism  26  does not directly receive the substrate W from the transport mechanism  23 . Consequently, the second suction portion  72  can suck the substrate W, supported by the supporting portion  25 , more suitably. Consequently, in the first taking step, the reversing mechanism  26  can take the substrate W from the supporting portion  25  more suitably. 
     The substrate reversing method includes the reversing step (Step S 25 ). The reversing step is performed after the first taking step. In the reversing step, the reversing mechanism  26  reverses the substrate W. In the reversing step, the second suction portion  72  half-rotates around the rotation axis A while sucking the substrate W. In the reversing step, the second suction portion  72  moves from the first position P 1  to the second position P 2  while the second suction portion  72  sucks the substrate W. Accordingly, the substrate W sucked by the second suction portion  72  can be reversed appropriately in the reversing step. 
     The substrate reversing method includes the second supporting step (Step S 26 ). The second supporting step is performed after the reversing step. In the second supporting step, the supporting portion  25  receives the substrate W from the reversing mechanism  26 . The supporting portion  25  supports the substrate W in a horizontal posture. Here in the second supporting step, the second suction portion  72  is located at the second position P 2 . That is, the second suction portion  72  is located below the substrate W in the second supporting step. Accordingly, in the second supporting step, the supporting portion  25  can receive the substrate W from the reversing mechanism  26  appropriately. 
     As described above, the substrate reversing method can reverse a substrate W suitably. 
     In the first supporting step, the position of the substrate W in the horizontal direction is adjusted. Accordingly, the substrate W supported by the supporting portion  25  is located at a suitable position in the first supporting step. Accordingly, the second suction portion  72  can suitably suck the substrate W supported by the supporting portion  25  in the first taking step. 
     The substrate reversing method includes the first substrate detecting step. In the first substrate detecting step, the substrate W supported by the supporting portion  25  is detected. The first substrate detecting step is performed after the first supporting step. Accordingly, the first substrate detecting step can check whether or not the first supporting step is completed suitably. Moreover, the first substrate detecting step is performed before the first taking step. Accordingly, before the first taking step, the first substrate detecting step can check whether or not the first taking step can be appropriately performed. As a result, the first substrate detecting step can appropriately determine whether or not the first taking step starts. 
     The supporting portion  25  is at rest at the first support position PH in the first supporting step. The supporting portion  25  is at rest at the first support position PH in the first taking step. In the reversing step, the supporting portion  25  moves from the first support position PH to the second support position PL. In the second supporting step, the supporting portion  25  moves from the second support position PL to the first support position PH. In such a manner as above, the supporting portion  25  is at rest only at two positions (specifically, first support position PH and second support position PL). In other words, the supporting portion  25  is not necessarily at rest at three or more positions. Specifically, the supporting portion  25  is not necessarily at rest at a position except the first support position PH and the second support position PL. This achieves simplified operation of the supporting portion  25 . 
     When the second suction portion  72  is located at the first position P 1 , the second suction portion  72  is positioned higher than the substrate WPH. Accordingly, in the first taking step, the second suction portion  72  can suck the substrate WPH suitably. 
     The height position of the substrate WP 1  is higher than the height position of the substrate WPH. Accordingly, in the first taking step, the reversing mechanism  26  can take the substrate W from the supporting portion  25  appropriately. The supporting portion  25  can deliver the substrate W to the reversing mechanism  26  appropriately at the first support position PH in the first taking step. 
     The height position of the rotation axis A is lower than the height position of the second suction portion  72  at the first position P 1 . Accordingly, the height position of the second suction portion  72  at the second position P 2  is lower than the height position of the second suction portion  72  at the first position P 1 . That is, the height position of the second suction portion  72  is lowered as the second suction portion  72  is moved from the first position P 1  to the second position P 2 . Here, the height position of the substrate WP 2  is lower than the height position of the substrate WPH and higher than the height position of the substrate WPL. Accordingly, the reversing mechanism  26  can deliver the substrate W to the supporting portion  25  appropriately in the second supporting step. In the second supporting step, the supporting portion  25  is moved from the second support position PL to the first support position PH, thereby achieving appropriate receipt of the substrate W from the reversing mechanism  26 . 
     The substrate reversing method includes the second taking step. The second taking step is performed after the second supporting step. In the second taking step, the transport mechanism  23  takes the substrate W from the supporting portion  25 . The second suction portion  72  is at rest at the second position P 2  from the second supporting step to the second taking step. Accordingly, the second taking step can start immediately after the second supporting step. This results in suitably enhanced throughput of the substrate treating apparatus  1 . 
     In the second taking step, the first suction portion  42  is located above the substrate W supported by the supporting portion  25 . The first suction portion  42  sucks the substrate W upward while causing gas to flow over the top face WT of the substrate W. Accordingly, in the second taking step, the transport mechanism  23  can take the substrate W from the supporting portion  25  suitably. 
     As describes above, in the second supporting step, the supporting portion  25  supports the substrate W in a horizontal posture. Accordingly, the first suction portion  42  can suitably suck the substrate W supported by the supporting portion  25  in the second taking step. 
     As described above, the substrate reversing method includes the second supporting step, and thus the reversing mechanism  26  delivers the substrate W to the supporting portion  25  and the transport mechanism  23  takes the substrate W from the supporting portion  25 . In this manner, the transport mechanism  23  indirectly receives the substrate W from the reversing mechanism  26  via the supporting portion  25 . The transport mechanism  23  does not directly receive the substrate W from the reversing mechanism  26 . Consequently, the first suction portion  42  can suck the substrate W, supported by the supporting portion  25 , more suitably. 
     In the second supporting step, the position of the substrate W in the horizontal direction is adjusted. Accordingly, the substrate W supported by the supporting portion  25  is located at a suitable position in the second supporting step. Accordingly, the first suction portion  42  can suitably suck the substrate W supported by the supporting portion  25  in the second taking step. 
     The substrate reversing method includes the second substrate detecting step. In the second substrate detecting step, the substrate W supported by the supporting portion  25  is detected. The second substrate detecting step is performed after the second supporting step. Accordingly, the second substrate detecting step can check whether or not the second supporting step is completed suitably. Moreover, the second substrate detecting step is performed before the second taking step. Accordingly, before the second taking step, the second substrate detecting step can check whether or not the second taking step can be performed appropriately. As a result, the second substrate detecting step can appropriately determine whether or not the second taking step starts. 
     The reversing step includes the retreating step. The retreating step is performed after the second taking step. Accordingly, an early timing of performing the second taking step can be achieved easily. There is no possibility that the second taking step is delayed due to the retreating step. 
     In the retreating step, the second suction portion  72  moves from the second position P 2  to the third position P 3 . The third position P 3  does not interfere with the transport mechanism  23 . In the first supporting step, the second suction portion  72  is located at the third position. This can prevent interference of the second suction portion  72  with the transport mechanism  23  appropriately in the first supporting step. 
     The retreating step includes the lowering step, the first moving step, the second moving step, and the raising step. In the lowering step, the supporting portion  25  moves from the first support position PH to the second support position PL. The first moving step is performed after the retreating step. In the first moving step, the second suction portion  72  rotates around the rotation axis A, and moves from the second position P 2  to the first position P 1 . The second moving step is performed after the first moving step. In the second moving step, the second suction portion  72  moves from the first position P 1  to the third position P 3 . The raising step is performed after the first moving step. In the raising step, the supporting portion  25  moves from the second support position PL to the first support position PH. Accordingly, in the retreating step, the second suction portion  72  can move from the second position P 2  to the third position P 3  appropriately. 
     This invention is not limited to the foregoing examples, but may be modified as follows. 
     In the embodiment described above, the first branch  74 A and the second branch  74 B each translate in the horizontal direction orthogonal to the rotation axis A. However, the present invention is not limited to this. For example, the first branch  74 A and the second branch  74 B may each move pivotally. Specifically, the first branch  74 A may move pivotally about a proximal end thereof on a horizontal plane. Likewise, the second branch  74 B may move pivotally about a proximal end thereof on a horizontal plane. Here, the proximal end of the first branch  74 A is, for example, a part of the first branch  74 A connected to the hand driving unit  81 . The proximal end of the second branch  74 B is, for example, a part of the second branch  74 B connected to the hand driving unit  81 . 
     In the embodiment described above, the third position P 3  is located at the same height position as the first position P 1 . However, the present invention is not limited to this. The third position P 3  may be positioned higher than the first position P 1 . 
     In the embodiment described above, the suction holder  74  is connected to the movement driving unit  84  and is not connected to the rotation base  83 . However, the present invention is not limited to this. The suction holder  74  may be connected to the movement driving unit  84  and the rotation base  83 . For example, the suction holder  74  may be supported by the rotation base  83  so as to slide with respect to the rotation base  83 . For example, the suction holder  74  may be supported by the rotation base  83  so as to swing with respect to the rotation base  83 . 
     In the embodiment described above, the position adjusting unit  65  contacts the edge of the substrate W. However, the present invention is not limited to this. For example, the shaft  64  may contact the back face WB of the substrate W. For example, the position adjusting unit  65  may contact at least either the edge of the substrate W or the back face WB of the substrate W. For example, the position adjusting unit  65  may contact both the edge of the substrate W and the back face WB of the substrate W. 
     In the embodiment described above, the supporting portion  25  includes the support pins  63 . However, the present invention is not limited to this. For example, the supporting portion  25  may include a shelf. Here, the shelf of the supporting portion  25  extends in horizontal direction (e.g., front-back direction X) to contact the substrate W. For example, the shelf of the supporting portion  25  may have the same shape as that of the shelf  32  of the substrate platform  27 . 
     In the embodiment described above, the number of inversion units  24  included in the substrate treating apparatus  1  is two. However, the present invention is not limited to this. The number of inversion units  24  included in the substrate treating apparatus  1  may be one. The number of inversion units  24  included in the substrate treating apparatus  1  may be three or more. 
     In the operational example in  FIG.  9   , the number of treating units  28  to which the substrates W each are transported is, for example, one. However, the present invention is not limited to this. The number of treating units  28  to which the substrates W each are transported may be two or more. For example, the substrates W may be transported to two or more treating units  28  in Step S 9 . For example, the substrates W may be transported to two or more treating units  28  after the substrates W are unloaded from the inversion units  24   a  and before the substrates W are loaded to the inversion units  24   b . For example, the substrates W may be transported to two or more treating units  28  after the Step S 14  and before the Step  15 . For example, the substrates W may be transported to one or more treating units  28  after the substrates W are unloaded from the inversion units  24   b  and before the substrates W are loaded to the substrate platform  27   b.    
     In the embodiment described above, the substrate holder  36  of the treating unit  28  may be a Bernoulli chuck, or a Bernoulli gripper, for example. The substrate holder  36  may hold the substrate W by sucking the substrate W, for example. For example, the substrate holder  36  may have a suction portion, not shown. Here, the suction portion of the substrate holder  36  may have a configuration substantially equal to the first suction portion  42  or the second suction portion  72  described above. The suction portion of the substrate holder  36  may be located below the substrate W supported by the substrate holder  36 . The suction portion of the substrate holder  36  may cause gas to flow over the back face WB of the substrate W supported by the substrate holder  36  and may suck the substrate W downward. 
     Alternatively, the substrate holder  36  may be a mechanical chuck or a mechanical gripper. For example, the substrate holder  36  may have an edge contacting portion, not shown. Here, the edge contacting portion of the substrate holder  36  may contact the edge of the substrate W. When the substrate holder  36  and the substrate W rotate, the edge contact portion of the substrate holder  36  may hold the substrate W in such a manner that the substrate W does not slip with respect to the edge contact portion. 
     The embodiment and the modifications described above may be variable appropriately by replacing or combining the unit of the present embodiments with other thereof. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  . . . substrate treating apparatus 
               23  . . . transport mechanism 
               24 ,  24   a ,  24   b  . . . inversion unit 
               25 ,  25   a ,  25   b  . . . supporting portion 
               26 ,  26   a ,  26   b  . . . reversing mechanism 
               29  . . . controller 
               41  . . . hand 
               42  . . . first suction portion 
               45  . . . hand driving unit (transport driving unit) 
               54  . . . receiver 
               65  . . . position adjusting unit 
               65   a  . . . slope face 
               67  . . . lifting drive unit 
               69  . . . substrate detector 
               71  . . . hand 
               72  . . . second suction portion 
               72 A . . . third suction portion 
               72 B . . . fourth suction portion 
               74  . . . suction holder 
               74 A . . . first branch 
               74 B . . . second branch 
               81  . . . hand driving unit 
               82  . . . rotation driving unit 
               83  . . . rotation base 
               84  . . . movement driving unit 
             A, Aa, Ab . . . rotation axis 
             J . . . center of substrate 
             K . . . central axis 
             P 1  . . . first position 
             P 2  . . . second position 
             P 3  . . . third position 
             PH . . . first support position 
             PL . . . second support position 
             W . . . substrate 
             W 1  . . . first face 
             W 2  . . . second face 
             WT . . . top face 
             WB . . . back face 
             WP 1  . . . substrate sucked by second suction portion at first position 
             WP 2  . . . substrate sucked by second suction portion at second position 
             WPH . . . substrate supported by supporting portion at first support position 
             WPL . . . substrate supported by supporting portion at second support position 
             X . . . front-back direction 
             Y . . . transverse direction 
             Z . . . vertical direction