Abstract:
An IC handler ( 4 ) of the present invention is provided with: a contact head ( 7 ), which holds a plurality of IC devices, and which presses the IC devices to a plurality of sockets ( 3 ); and a movable arm ( 6 ) that moves the contact head ( 7 ). The movable arm ( 6 ) has power supply ports (VO, HO) that are connected to supply sources (VS, HS) of power for generating operations of the contact head ( 7 ), and the contact head ( 7 ) has a plurality of operating sections ( 70 ) that operate with the power, and a supporting section ( 71 ), which supports the operating sections ( 70 ), and which is removably attached to the movable arm ( 6 ). The supporting section ( 71 ) of the contact head ( 7 ) has: connecting ports (VC, HC) that are removably connected to the supply ports (VO, HO); and supply paths ( 71   a,    71   d ) for supplying the power to the operating sections ( 70 ) from the connecting ports (VC, HC) connected to the supply ports (VO, HO).

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to an IC handler for conveying IC devices to a test head having a plurality of sockets. 
       BACKGROUND ART 
       [0002]    In the process of production of IC devices, a test apparatus for performing power-up tests on IC devices is referred to as an “IC tester”. Further, a conveyor apparatus for conveying IC devices for power-up tests by an IC tester is referred to as an IC handler. In general, an IC handler is provided with a contact head for holding the IC devices and a robot arm for making the contact head move. In the process of conveyance of IC devices, first, the robot arm makes the contact head move toward the test head of the IC tester. Due to this, the IC devices are inserted into the sockets. Next, the contact head pushes the IC devices in the sockets to thereby electrically connect the IC devices to the test head. Due to this, power-up tests of the IC devices are started. 
         [0003]    An IC device in a state inserted into a socket of the test head will be referred to as a DUT (device under test). In general, a test head is provided with a plurality of sockets. Power-up tests of a plurality of DUTs inserted into these sockets can be simultaneously run. In the same way, the contact head of the IC handler is provided with a plurality of clamping sections so as to enable IC devices to be simultaneously inserted into the plurality of sockets. The array of these clamping sections has to be made equal to the array of DUTs at the test head, so if the array of DUTs is changed, it is necessary to change the array of clamping sections in accordance with the new array of DUTs. In this regard, in a conventional IC handler, the individual clamping sections are fastened to the contact head by screws etc., so when changing the array of clamping sections, large scale work of altering the contact head was necessary. 
         [0004]    In relation to this, PLT 1 discloses an IC handler provided with a wedge shaped engagement member strongly fastening individual clamping sections (clampers) to the fastening surface of the contact head body. Further, the IC handler of the PLT 1 is provided with a changing mechanism for releasing the engaged state of the engagement member and fastening surface linked with operation of a manual operating member. This engagement member enables individual clamping sections to be changed for each type of IC device. However, the individual clamping sections have various fluid piping and electrical wiring etc. connected to them, so to change the array of the plurality of clamping sections at the contact head, it is necessary to reinstall the piping and wiring corresponding to the new array of the clamping sections. Therefore, even if the individual clamping sections are designed to be easily interchanged, large scale work of altering the contact head is still unavoidable for changing the array of DUTs. 
       CITATION LIST 
     Patent Literature 
       [0005]    PLT 1: Pamphlet of International Publication No. 2010/109678 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0006]    An IC handler which enables the array of DUTs to be changed without requiring large scale work of altering a contact head is being sought. 
       Solution to Problem 
       [0007]    According to one aspect of the present invention, there is provided an IC handler conveying a plurality of IC devices to a test head having a plurality of sockets, wherein the IC handler is provided with a contact head for holding a plurality of IC devices and pushing the plurality of IC devices against the plurality of sockets and a movable arm making the contact head move, the movable arm has a supply port of power connected to a supply source of power for enabling operation of the contact head, the contact head has a plurality of operating parts operating due to the power and a support part supporting the plurality of operating parts and attached detachably to the movable arm, and the supporting section has a connection port detachably connected to the supply port and a supply part supplying the power from the connection port connected to the supply port to the plurality of operating parts. 
       Advantageous Effects of Invention 
       [0008]    According to one aspect of the present invention, by just changing a contact head attached to a movable arm to another contact head, the connection port of the other contact head is connected to the supply port of the movable arm side. Therefore, according to one aspect of the present invention, the large scale work of altering the contact head accompanying change of the array of DUTs becomes unnecessary, so it becomes possible to easily handle various arrays of DUTs. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0009]      FIG. 1  is a plan view of an IC test system including an IC handler of an embodiment of the present invention. 
           [0010]      FIG. 2  is a cross-sectional view along the line II-II of  FIG. 1 . 
           [0011]      FIG. 3  is a partially enlarged view showing a part III of  FIG. 2 . 
           [0012]      FIG. 4  is a partially enlarged view similar to  FIG. 3  and shows the state where the contact head is detached from a movable arm. 
           [0013]      FIG. 5  is a perspective view of a movable arm in an IC handler of the present embodiment. 
           [0014]      FIG. 6  is a bottom view of the movable arm of  FIG. 5 . 
           [0015]      FIG. 7  is a perspective view of a first contact head in an IC handler of the present embodiment as seen from the bottom at a slant. 
           [0016]      FIG. 8  is a perspective view of a first contact head in an IC handler of the present embodiment as seen from the bottom at a slant. 
           [0017]      FIG. 9  is a perspective view of a second contact head in an IC handler of the present embodiment as seen from the bottom at a slant. 
           [0018]      FIG. 10  is a perspective view of a second contact head in an IC handler of the present embodiment as seen from the bottom at a slant. 
           [0019]      FIG. 11  is a perspective view of a third contact head in an IC handler of the present embodiment as seen from the bottom at a slant. 
           [0020]      FIG. 12  is a perspective view of a third contact head in an IC handler of the present embodiment as seen from the bottom at a slant. 
           [0021]      FIG. 13  is a perspective view showing the state where the contact head  7  is detached from the movable arm  6  in an IC handler of the present embodiment. 
           [0022]      FIG. 14  is a perspective view showing the state where the contact head  7  is attached to the movable arm  6  in an IC handler of the present embodiment. 
           [0023]      FIG. 15  is a perspective view showing enlarged the vicinity of a clamp lever in the movable arm of an IC handler of the present embodiment. 
           [0024]      FIG. 16  is a perspective view similar to  FIG. 15  and showing the state where the contact head is fastened to the movable arm. 
           [0025]      FIG. 17  is a view for explaining the operation of a fastening mechanism part in the movable arm of the IC handler of the present embodiment. 
           [0026]      FIG. 18  is a perspective view of a loading part of a shift unit in the IC handler of the present embodiment. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0027]    Below, embodiments of the present invention will be explained in detail referring to the drawings. In these drawings, similar component elements are assigned similar notations. Note that, the following description does not limit the technical scope or meaning of terms of the inventions described in the claims. 
         [0028]    Referring to  FIG. 1  to  FIG. 18 , IC handlers according to embodiments of the present invention will be explained.  FIG. 1  is a plan view of an IC test system  1  including a typical IC handler  4  according to the present embodiment. As shown in  FIG. 1 , the IC test system  1  comprises a table shaped base  10 , a test head  2  mounted at the base  10 , and a plurality of sockets  3  arranged at the test head  2 . The test head  2  is a test apparatus which performs power-up tests on IC devices inserted at the sockets  3 . The individual sockets  3  have carrying surfaces  3   a  on which the IC devices are placed and are designed to attach DUTs placed on the carrying surfaces  3   a  to the test head  2 . In the following explanation, an IC device in the state inserted in a socket  3  will particularly be referred to as a “DUT”. The structures of the individual sockets  3  are also shown in  FIG. 2 . 
         [0029]    The IC handler  4  of the present embodiment is a conveyor device conveying IC devices for power-up tests by the test head  2  of the IC test system  1 . The IC test system  1  according to the example of  FIG. 1  is provided with a pair of IC handlers  4 ,  4 . These IC handlers  4 ,  4  are provided with a pair of shift units  5 ,  5  able to move along the top surface of the base  10  in the direction of the arrow A 10  and a pair of movable arms  6 ,  6  arranged above the base  10 . Note that, in the example of  FIG. 1 , the direction parallel to the direction of movement of the shift units  5 ,  5  is made the X-direction and the direction perpendicular to the X-direction at the top surface of the base  10  is made the Y-direction (same in other drawings). The test head  2  according to the present example has two lines of sockets  3  side by side in the Y-direction. Each line includes four sockets arranged in the X-direction. That is, the test head  2  according to the present example has a total of eight sockets  3  arranged at it. The carrying surfaces  3   a  of these sockets  3  are oriented so as to be parallel in both the X-direction and Y-direction. Note that, between the test head  2  and the sockets, a printed circuit board called a “performance board” is arranged. In general, the array of the DUTs at the test head  2  is determined in accordance with the circuit patterns of the performance board. 
         [0030]    In the example of  FIG. 1 , a pair of IC handlers  4 ,  4  are arranged symmetrically with each other in the Y-direction so as to straddle the sockets  3 . The respective IC handlers  4  are configured similar to each other. For this reason, below, only one IC handler  4  will be explained. In the example of  FIG. 1 , a shift unit  5  of the IC handler  4  has a loading part  5   a  and an unloading part  5   b  arranged aligned in the X-direction. The loading part  5   a  and the unloading part  5   b  are moved by a not shown drive mechanism in the X-direction. Here, the loading part  5   a  is a region where pre-test IC devices to be inserted at sockets  3  are placed. The pre-test IC devices are placed by a not shown loading robot at the loading part  5   a . Further, the unloading part  5   b  is a region at which tested IC devices ejected from the sockets  3  are placed. The IC devices placed at the unloading part  5   b  are unloaded by a not shown unloading robot to trays in accordance with the results of the power-up tests. 
         [0031]    In the example of  FIG. 1 , the loading part  5   a  and the unloading part  5   b  have configurations similar to each other, so below only the configuration of the loading part  5   a  will be explained. As shown in  FIG. 1 , the loading part  5   a  according to the present example is provided with a plate-shaped base part  51  able to move in the X-direction, a plurality of holding parts  52  having pockets for holding individual IC devices, and a plate-shaped holder supporting part  53  supporting these holding parts  52 . The array of the plurality of holding parts  52  at the holder supporting part  53  matches the array of the sockets  3  at the test head  2 . These holding parts  52  are suitably changed according to the type of IC device under test. For this reason, the individual holding parts  52  are called “change kits”. 
         [0032]    As shown by the arrow A 10  in  FIG. 1 , the shift unit  5  can move in the X-direction between a loading position where the loading part  5   a  adjoins the sockets  3  and an unloading position where the unloading part  5   b  adjoins the sockets  3 . In the example of  FIG. 1 , the shift unit  5  present at the unloading position is shown by the solid line, while the shift unit  5  present at the loading position is shown by the one-dot chain line. The shift plate  5  according to the present example moves from the unloading position to the loading position to thereby convey IC devices placed at the loading part  5   a  to near the sockets  3 . Further, the IC devices conveyed to near the sockets  3  are inserted by the movable arm  6  of the IC handler  4  into the sockets  3 . 
         [0033]    The movable arm  6  according to the example of  FIG. 1  is a robot arm able to move in the Y-direction and Z-direction by a not shown drive mechanism. The movable arm  6  according to the present example successively performs an operation for charging pre-test IC devices in the sockets  3  and an operation of ejecting tested IC devices from the socket  3 .  FIG. 2  is a cross-sectional view along the line II-II of  FIG. 1 . Note that the Z-direction of  FIG. 2  is a direction vertical to both the X-direction and Y-direction of  FIG. 1 , that is, a direction vertical to the carrying surfaces of the sockets  3  (same in other drawings). As shown in  FIG. 2 , the front end part of the movable arm  6  according to the present example has a contact head  7  for clamping the IC devices D attached to it. The front end part of the movable arm  6  will be referred to below as a “mounting part  61 ”. 
         [0034]    The contact head  7  according to the present example is provided with the function of clamping the IC devices D and the function of pushing the IC devices D against the sockets. It has a plurality of operating parts  70  operating to realize these functions. The array of the plurality of operating parts  70  at the contact head  7  matches the array of the plurality of sockets  3  at the test head  2 . Therefore, the contact head  7  according to the present example has two operating parts  70  arranged in the Y-direction. Each row includes four operating parts  70  arranged in the X-direction. That is, the contact head  7  according to the present example has a total of eight operating parts  70 . These operating parts  70  are supported by a common supporting section  71 . The supporting section  71  is detachably attached to the mounting part  61  of the movable arm  6 . Note that, in  FIG. 2 , the internal structures of the mounting part  61 , operating part  70 , and supporting section  71  are omitted. 
         [0035]      FIG. 3  is a cross-sectional view showing a part represented by the arrow III of  FIG. 2 , that is, showing enlarged the vicinity of one operating part  70 . As shown in  FIG. 3 , the operating part  70  according to the present example is provided with a clamping section  72  having the function of clamping an IC device D and a pushing section  73  having the function of pushing an IC device D against a socket  3 . The clamping section  72  according to the present example has a vacuum nozzle  721  operating by vacuum and is designed to pick up and hold an IC device D by vacuum supplied from a power supply source comprised of a vacuum supply source VS, for example, a vacuum pump. The clamping section  72  according to the present example is connected to a vacuum supply source VS by the vacuum route explained below. Below, the vacuum supply source VS at the vacuum route will be called “upstream” while the clamping section  72  side will be called “downstream”. 
         [0036]    As shown in  FIG. 3 , upstream in the vacuum route, a vacuum supply source VS and a first joint VJ 1  attached to the mounting part  61  is connected by a first vacuum tube VT 1 . Next, the first joint VJ 1  of the mounting part  61  and the second joint VJ 2  attached to the supporting section  71  are connected by supply paths  61   a ,  71   a  running through the mounting part  61  and supporting section  71 . Here, the supply path  61   a  of the mounting part  61  extends in the Z-direction and has an expanded part  61   a  near the end part at the downstream side. At the expanded part  61   a   1 , a ring-shaped vacuum pad VP is fit. Further, the supply path  71   a  of the supporting section  71  has an upstream side first part  71   a   1  extending in the Z-direction and a downstream side second part  71   a   2  extending in the Y-direction. Next, the second joint VJ 2  of the supporting section  71  and the third joint VJ 3  attached to the clamping section  72  are connected by a second vacuum tube VT 2 . Note that, at the front end part of the clamping section  72 , a contact member  722  contacting the IC device is detachably attached. The contact member  722  is suitably changed according to the type of IC device under test. For this reason, the contact member  722  is called a “change kit” in the same way as the above-mentioned holding parts  52 . 
         [0037]    As shown in  FIG. 3 , the pushing section  73  according to the present example has a piston  731  operating by hydraulic pressure and is designed to push an IC device against a socket  3  by hydraulic pressure supplied from a power source comprised of a hydraulic source HS, for example, a compressor. More specifically, the piston  731  of the pushing section  73  is inserted in a columnar shaped recessed part  71   b  formed at the bottom surface of the supporting section  71  and receives hydraulic pressure so as to slide in the Z-direction so as to push an IC device against a socket  3 . The pushing section  73  according to the present example is connected by a fluid route explained below to the hydraulic supply source HS. Below, the hydraulic supply source HS side at the fluid route will be called “upstream” and the pushing section  73  side will be called “downstream”. 
         [0038]    As shown in  FIG. 3 , upstream of the fluid route, the hydraulic supply source HS and the hydraulic nozzle HN attached to the mounting part  61  are connected by a fluid tube HT. The hydraulic nozzle HN is inserted into the Z-direction through hole  61   b  formed in the mounting part  61 . The end part of the downstream side of the hydraulic nozzle HN sticks out from the through hole  61   b  and is inserted into a recessed part  71   c  formed at the top surface of the supporting section  71 . Between the front end part of the hydraulic nozzle HN and the recessed part  71   c , a circular ring-shaped bush B 1  fit in the recessed part  71   c  is interposed. Further, at the inner circumferential surface of the bush B 1 , a ring-shaped groove is formed for an O-ring. In this ring shaped groove, an O-ring OR is fit. Next, between the bottom surfaces of the recessed part  71   c  and recessed part  71   b  at the supporting section  71 , a supply path  71   d  extending in the Z-direction is formed so as to run through the supporting section  71 . 
         [0039]    As shown in  FIG. 3 , the pushing section  73  according to the present example is provided with the above-mentioned piston  731 , a plurality of guide rods  732  extending in the Z-direction and arranged so as to straddle the piston  731 , and a flat plate-shaped bottom part  733  coupling the piston  731  and plurality of guide rods  732 . In the present example, at the bottom surface of the supporting section  71 , a plurality of recessed parts  71   e  in which cylindrical bushes B 2  are inserted are formed. At these bushes B 2 , guide rods  732  is inserted to be able to slide in the Z-direction. Further, the guide rods  732  are designed to slide along the inner circumferential surfaces of the bushes B 2  in the Z-direction so as to guide the piston  721  in the Z-direction. Further, at the bottom surface of the supporting section  71 , a stopping member  71   f  for stopping the piston  731  at the bottommost point is attached. 
         [0040]    As explained above, the contact head  7  according to the present example is detachably attached to the mounting part  61  of the movable arm at the supporting section  71 .  FIG. 4  is a cross-sectional view similar to  FIG. 3  and shows the state where the contact head  7  is detached from the movable arm  6 . As shown in  FIG. 4 , a downstream side end part of a vacuum pad VP of the mounting part  61  forms a vacuum supply port VO for the contact head  7 . The upstream side end part at the supply path  71   a  of the supporting section  71  forms a connection port VC connected to the vacuum supply port VO. In the same way, the downstream side end part at the hydraulic nozzle HN of the mounting part  61  forms a hydraulic supply port HO for the contact head  7 . The upstream side end part at the supply path  71   d  of the supporting section  71  forms a connection port HC connected to the hydraulic supply port HO. 
         [0041]    Referring again to  FIG. 2 , the operation when the movable arm  6  according to the present example charges pre-test IC devices into the sockets  3  will be explained. The movable arm  6  of the present example moves the contact head  7  according to the following procedure to thereby charge pre-test IC devices D into the socket  3 . First, as shown by the solid line of  FIG. 2 , when the shift unit  5  is present at the loading position, the contact head  7  is moved in the Y-direction and Z-direction whereby operating sections  70  (clamping sections  72 ) are made to abut against the IC devices D on the loading part  5   a . Next, the operating sections  70  (clamping sections  72 ) clamp ID devices D by vacuum pickup, then, as shown by the arrow A 219  of  FIG. 2 , the contact head  7  is moved in the Z-direction whereby the IC devices D are lifted up from the loading part  5   a . Furthermore, as shown by the arrow A 22  of  FIG. 2 , the contact head  7  is moved in the Y-direction whereby the IC devices D are aligned with the socket  3  in the Y-direction. Next, as shown by the arrow A 23  of  FIG. 2 , the contact head  7  is moved in the Z-direction whereupon the IC devices D are placed at the carrying surfaces  3   a  of the sockets  3 . Due to this, the IC devices D finish being placed at the sockets  3 . The state at this time is shown by the broken line of  FIG. 2 . 
         [0042]    After that, as shown by the arrow A 24  of  FIG. 2 , the operating sections  70  (pushing sections  73 ) move in the Z-direction whereby the IC devices D inside the sockets  3  are pushed against the test head  2 . Due to this, the IC devices D inside the sockets  3  are electrically connected with the test head  2  and the power-up tests of the IC devices D are started. When the power-up tests of the IC devices D are started, the shift unit  5  is moved from the loading position to the unloading position. Further, when the power-up tests of the IC devices inside the sockets  3  are completed, the contact head  7  is moved in the opposite direction to the direction shown by the arrows A 21 , A 22 , and A 23  of  FIG. 2  whereby the IC devices D are placed at the unloading part  5   b . Further, the pickup states by the operating sections  70  (clamping sections  72 ) are released, whereby the operation for ejecting the IC devices D from the sockets  3  is completed. This series of steps will sometimes be referred to below as the “insertion and ejection process” of IC devices D. 
         [0043]    Note that, for simplification of the explanation,  FIG. 2  shows the shift unit  5  and movable arm  6  of only one IC handler  4 , but the shift unit  5  and movable arm  6  of the other IC handler  4  can operate in the same way as these. That is, the shift units  5 ,  5  and movable arms  6 ,  6  of the pair of IC handlers  4 ,  4  can alternately perform the above-mentioned insertion and ejection process. Due to this, the frequency of replacement of IC devices at the sockets  3  is increased, so the operating rate of the test head  2  can be improved. 
         [0044]    In the above way, the movable arm and contact head of the IC handler of the present embodiment work together to successively perform the insertion and ejection process of IC devices D. However, when the array of DUTs at the test head  2  changes along with the change of the performance board etc., it is necessary to change the array of operating sections  70  at the contact head  7  in accordance with this. For this reason, the IC handler  4  of the present embodiment is designed to enable the contact head  7  attached to the movable arm  6  to be easily replaced with another contact head  70  with a different array of operating sections  70 . This point will be explained in detail below. 
         [0045]      FIG. 5  is a perspective view showing only the movable arm  6  of an illustrative IC handler of the present embodiment, while  FIG. 6  is a bottom view of a mounting part  61  in the movable arm  6  of  FIG. 5 . As shown in  FIG. 5  and  FIG. 6 , the mounting part  61  of the movable arm  6  according to the present example is provided with clamp levers  81  able to rotate about an axis of rotation parallel to the X-direction and clamp shafts  82  able to move linearly in the Z-direction linked with the rotational motions of the clamp levers  81 . The clamp levers  81  and clamp shafts  82  form part of the fastening mechanism part  8  for fastening the contact head  7  to the mounting part  61 . Further, the clamp shafts  82  has flange parts  82   a  inserted in through holes  71   g  formed at the supporting section  71  of the contact head  7 . 
         [0046]    As shown in  FIG. 6 , the mounting part  61  according to the present example has a total of 16 supply ports VO supplying vacuum to the contact head  7  and a total of eight supply ports HO supplying hydraulic pressure to the contact head  7 . More specifically, the mounting part  61  of the present example has two lines of supply ports VO side by side in the Y-direction. Each line includes two sets of supply ports VO arranged in the X-direction. Further, each set includes four supply ports VO arranged in the X-direction. Further, the mounting part  61  of the present example has two lines of supply ports HO side by side in the Y-direction. Each line includes four supply ports HO arranged in the X-direction. Below, the 16 vacuum supply ports VO shown in  FIG. 6  will be referred to respectively as the supply ports VO 1  to VO 16  and the eight hydraulic supply ports HO will be referred to respectively as the supply ports HO 1  to HO 8 . Further, the mounting part  61  of the present example can be further provided with a proximity sensor PS for confirming the mounting state of the contact head  7  and an electrical terminal EC 1  for transfer of various control sensors and electrical signals at the contact head  7  side. The electrical terminal EC 1  can be, for example, a D-sub (D-subminiature) terminal. 
         [0047]      FIG. 7  and  FIG. 8  are perspective views showing an example of a contact head  7  of the IC handler  4  of the present embodiment. Below, the contact head  7  of the present example will be called the “first contact head  7 ”.  FIG. 7  is a perspective view of the first contact head  7  seen from below at a slant, while  FIG. 8  is a perspective view of the first contact head seen from above at a slant. “Above” referred to here indicates the supporting section  71  side of the contact head  7 , while “below” indicates the operating section  70  side of the contact head  7 . As shown in  FIG. 7 , the first contact head  7  according to the present example has 16 operating sections  70  supported by a common supporting section  71 . Further, as shown in  FIG. 8 , at the supporting section  71  of the first contact head  7  according to the present example, through holes  71   g  in which the clamp shafts  82  at the movable arm  6  side are inserted are formed. At the inside circumferential surfaces of the through holes  71   g , C-shaped clamp shaft holding parts  71   h  for holding the flange parts  82   a  of the clamp shafts  82  are formed. As shown in  FIG. 8 , the supporting section  71  of the first contact head  7  has 16 connection ports VC arranged so as to connect to the vacuum supply ports VO of the movable arm  6  side and eight connection ports HC arranged so as to connect to the hydraulic supply ports HO at the movable arm  6  side. Below, the 16 connection ports VC shown in  FIG. 8  will be referred to as the connection ports VC 1  to VC 16  and the eight connection ports HC will be referred to as the connection ports HC 1  to HC 8 . In the example of  FIG. 8 , the vacuum connection ports VC 1  to VC 16  are arranged so as to be respectively connected to the supply ports VO 1  to VO 16  at the movable arm  6  side, while the hydraulic connection ports HO 1  to HO 8  are arranged so as to be respectively connected to the supply ports HO 1  to HO 8  at the movable arm  6  side. As shown in  FIG. 8 , the supporting section  71  of the first contact head  7  has an electrical terminal E 2  at the contact head  7  side connected to the electrical terminal E 1  of the movable arm  6  side. Note that, in  FIG. 7  and  FIG. 8 , the second vacuum tube VT 2  is omitted. 
         [0048]      FIG. 9  and  FIG. 10  are perspective views showing an example of a second contact head  7  able to be interchanged with the first contact head  7  shown in  FIG. 7  and  FIG. 8 .  FIG. 9  is a perspective view of the second contact head  7  seen from below at a slant, while  FIG. 10  is a perspective view of the second contact head seen from above at a slant. As shown in  FIG. 9 , the second contact head  7  according to the present example has eight operating sections  70  supported by a common supporting section  71 . Further, as shown in  FIG. 10 , at the supporting section  71  of the second contact head  7  according to the present example, through holes  71   g  in which the clamp shafts  82  at the movable arm  6  side are inserted are formed. At the inside circumferential surfaces of the through holes  71   g , C-shaped clamp shaft holding parts  71   h  for holding the flange parts  82   a  of the clamp shafts  82  are formed. 
         [0049]    As shown in  FIG. 10 , the supporting section  71  of the second contact head  7  has eight connection ports VC arranged so as to be connected to the vacuum supply ports VO at the movable arm  6  side and eight connection ports HC arranged so as to be connected to the hydraulic supply ports HO at the movable arm  6  side. Below, the eight connection ports VC shown in  FIG. 10  will be called the connection ports VC 1  to VC 8  while the eight connection ports HC will be called the connection ports HC 1  to HC 8 . In the example of  FIG. 10 , the vacuum connection ports VC 1 , VC 2 , VC 3 , VC 4 , VC 5 , VC 6 , VC 7 , and VC 8  are arranged so as to be connected to the supply ports VO 3 , VO 4 , VO 5 , VO 6 , VO 11 , VO 12 , VO 13 , and VO 14  at the movable arm  6  side, while the hydraulic connection ports HC 1  to HC 8  are arranged so as to be connected to the supply ports HO 1  to HO 8  at the movable arm  6  side. Further, the array of the vacuum connection ports VC 1 , VC 2 , VC 3 , VC 4 , VC 5 , VC 6 , VC 7 , and VC 8  at the second contact head  7  of  FIG. 10  matches the array of the vacuum connection ports VC 3 , VC 4 , VC 5 , VC 6 , VC 11 , VC 12 , VC 13 , and VC 14  at the first contact head  7  of  FIG. 8 . In the same way, the array of the hydraulic connection ports HC 1  to HC 8  of the second contact head  7  of  FIG. 10  matches the array of the hydraulic connection ports HC 1  to HC 8  at the first contact head  7  of  FIG. 8 . As shown in  FIG. 10 , the supporting section  71  of the second contact head  7  has an electrical terminal E 2  at the contact head  7  side connected with the electrical terminal E 1  at the movable arm  6  side. Note that, in  FIG. 9  and  FIG. 10 , the second vacuum tube VT 2  is omitted. 
         [0050]      FIG. 11  and  FIG. 12  are perspective views showing an example of a third contact head  7  able to be interchanged with the first contact head  7  shown in  FIG. 7  and  FIG. 8 .  FIG. 11  is a perspective view of the third contact head  7  seen from below at a slant, while  FIG. 12  is a perspective view of the third contact head seen from above at a slant. As shown in  FIG. 11 , the third contact head  7  according to the present example has four operating sections  70  supported by a supporting section  71 . Further, as shown in  FIG. 12 , at the supporting section  71  of the third contact head  7  according to the present example, through holes  71   g  in which the clamp shafts  82  at the movable arm  6  side are inserted are formed. At the inside circumferential surfaces of the through holes  71   g , C-shaped clamp shaft holding parts  71   h  for holding the flange parts  82   a  of the clamp shafts  82  are formed. 
         [0051]    As shown in  FIG. 12 , the supporting section  71  of the third contact head  7  has four connection ports VC arranged so as to be connected to the vacuum supply ports VO of the movable arm  6  side and four connection ports HC arranged so as to be connected to the hydraulic supply ports HO at the movable arm  6  side. Below, the four connection ports VC shown in  FIG. 12  will be referred to as the connection ports VC 1  to VC 4  and the four connection ports HC will be referred to as the connection ports HC 1  to HC 4 . In the example of  FIG. 12 , the vacuum connection ports VC 1 , VC 2 , VC 3 , and VC 4  are arranged to be connected respectively to the supply ports VO 4 , VO 5 , VO 12 , and VO 13  of the movable arm  6  side, while the hydraulic connection ports HC 1 , HC 2 , HC 3 , and HC 4  are arranged to be connected respectively to the supply ports HO 2 , HO 3 , HO 6 , and HO 7  of the movable arm  6  side. Further, the array of the vacuum connection ports VC 1 , VC 2 , VC 3 , and VC 4  at the third contact head  7  of  FIG. 12  matches the array of the vacuum connection ports VC 4 , VC 5 , VC 12 , and VC 13  at the first contact head  7  of  FIG. 8 . In the same way, the array of the hydraulic connection ports HC 1 , HC 2 , HC 3 , and HC 4  at the third contact head  7  of  FIG. 12  matches the array of the hydraulic connection ports HC 2 , HC 3 , HC 6 , and HC 7  at the first contact head  7  of  FIG. 8 . As shown in  FIG. 12 , the supporting section  71  of the third contact head  7  has an electrical terminal E 2  of the contact head  7  side connected to the electrical terminal E 1  of the movable arm  6 . Note that, in  FIG. 11  and  FIG. 12 , the second vacuum tube VT 2  is omitted. 
         [0052]    In the above way, the arrays of the connection ports VC and connection ports HC at the supporting section  71  are the same in all of the first to the third contact heads  7 . Therefore, according to the IC handler  4  of the present embodiment, by just changing the contact head  7  attached to the movable arm  6  to another contact head  7 , the connection ports VC and connection ports HC of the other contact head  7  are respectively connected to the supply ports VO and supply ports HO of the movable arm  6  side. Therefore, according to the IC handler  4  of the present embodiment, large scale work of altering the contact head  7  accompanying change of the array of DUTs becomes unnecessary, so it is possible to easily deal with various arrays of DUTs. 
         [0053]    Next, the method of attaching the contact head  7  at the IC handler  4  of the present embodiment will be explained.  FIG. 13  is a perspective view showing the state at an illustrative IC handler  4  of the present embodiment where the contact head  7  is detached from the movable arm  6 , while  FIG. 14  is a perspective view showing the state where the contact head  7  is attached to the movable arm  6 . When the contact head  7  is attached to the movable arm  6 , first, the contact head  7  is moved in the direction of the arrow A 131  of  FIG. 13  whereby the clamp shafts  82  of the movable arm  6  are inserted in through holes  71   g  of the supporting section  71  at the contact head  7  (see  FIG. 8 ,  FIG. 10 , and  FIG. 12 ). Next, if the contact head  7  is moved in the direction of the arrow A 132  of  FIG. 13 , the flange parts  82   a  of the clamp shafts  82  become held by the clamp shaft holding parts  71   h  of the supporting section  71  (see  FIG. 8 ,  FIG. 10 , and  FIG. 12 ). Due to this, the contact head  7  is temporarily fastened with respect to the movable arm  6 . At this point of time, the contact head  7  is not fastened with respect to the movable arm  6  and the connection port VC and connection port HC of the contact head  7  are not connected to the supply ports VO and HO of the movable arm  6  side. After that, the clamp lever  81  of the movable arm  6  is rotated, whereby the contact head  7  is fastened with respect to the movable arm  6 . 
         [0054]      FIG. 15  is a perspective view showing enlarged the vicinity of a clamp lever  81  at the movable arm  6  of  FIG. 13  and shows the state where the contact head  7  is temporarily fastened at the movable arm  6 , that is, the state before the contact head  7  is fastened to the movable arm  6 . The position of the clamp lever  81  shown in  FIG. 15  will be referred to below as the releasing position. Further,  FIG. 16  is a perspective view similar to  FIG. 15  and shows the state after the contact head  7  is fastened with respect to the movable arm  6 . The position of the clamp lever shown in  FIG. 16  will be referred to below as the fastening position. As will be understood from  FIG. 15  and  FIG. 16 , the clamp lever  81  according to the present example can move between the releasing position and the fastening position by being rotated about the axis of rotation R parallel to the X-direction. Further, if the clamp lever is rotated in the direction shown by the arrow A 150  of  FIG. 15  and moved to the fastening position, the above-mentioned operation of the fastening mechanism part  8  enables the contact head  7  to be fastened with respect to the movable arm  6 . On the other hand, if the clamp lever  81  is rotated in the direction shown by the arrow A 161  of  FIG. 16  and moved to the releasing position, the fastened state of the contact head  7  by the fastening mechanism part  8  is released. Note that, the mounting part  61  according to the present example is provided with a latch member  9  for latching the clamp lever  81  present at the fastening position in a releasable manner. Since the clamp lever  81  shown in  FIG. 16  is latched by the latch member  9 , it will never move to the releasing position. To make the clamp lever  81  present at the fastening position move to the releasing position, the latch member  9  has to be made to move in the direction of the arrow A 162  of  FIG. 16  to thereby release the clamp lever  81  from the state latched by the latch member  9 . 
         [0055]    Next, the operation of the fastening mechanism part  8  at the mounting part  61  of the movable arm  6  will be explained.  FIG. 17  is a view showing a cross-section along the YZ plane of the movable arm  6  and contact head  7  shown in  FIG. 16 .  FIG. 17 , in the same way as  FIG. 16 , shows the state after the contact head  7  is fastened with respect to the movable arm  6 . In  FIG. 17 , for convenience, the parts of the fastening mechanism part  8  and contact head  7  are shown by solid lines and the outer shape of the mounting part  61  is shown by the broken lines. As shown in  FIG. 17 , the fastening mechanism part  8  according to the present example is provided with not only the above-mentioned clamp lever  81  and clamp shaft  82 , but also a horizontal shaft  83  fastened to the clamp lever  81  and extending in the X-direction and a link member  84  fastened to the horizontal shaft  83  and extending vertical to the horizontal shaft  83 . In the example of  FIG. 17 , the horizontal shaft  83  is supported by a bearing  85  fastened to the mounting part  61  to be able to rotate about the axis of rotation R, while the clamp shaft  82  is supported by a bearing  86  fastened to the mounting part  61  to be able to move linearly in the Z-direction. Further, at the front end part of the link member  84 , a columnar cam part  84   a  having a centerline parallel to the X-direction is formed. At the clamp shaft  82 , a groove part  82   b  extending in the X-direction is formed so as to accommodate a cam part  84   a  of the link member  84 . Furthermore, between the groove part  82   b  and the flange part  82   a  in the direction of extension of the clamp shaft  82 , a step difference  82   c  of the shape corresponding to the clamp shaft holding part  71   h  is formed. 
         [0056]    According to the fastening mechanism part  8  of the present example, the rotational motion of the clamp lever  81  and horizontal shaft  83  about the axis of rotation R is converted to linear motion of the clamp shaft  82  in the Z-direction through the link member  84 . More specifically, if the clamp lever  81  is moved from the releasing position to the fastening position, the horizontal shaft  83  is rotated in the direction of the arrow A 171  of  FIG. 17 , so the cam part  84   a  of the link member  84  rolls against the recessed part  82   b  of the clamp shaft  82  while making the clamp shaft  82  move upward in the Z-direction. Due to this, the flange part  82   a  of the clamp shaft  82  pushes the clamp shaft holding part  71   h  of the supporting section  71  upward, so the supporting section  71  is fastened to the mounting part  61 . After that, the clamp lever  81  is latched by the latch member  9  whereby the step of attachment of the contact head  7  is ended. Note that, in the example of  FIG. 17 , the flange part  82   a  of the clamp shaft  82  has a dish spring DS built into it. Due to the elastic recovery force of the dish spring DS, the contact head  7  is stably fastened with respect to the mounting part  61 . 
         [0057]    On the other hand, if the clamp lever  81  is moved from the fastening position to the releasing position, the horizontal shaft  83  is rotated in the direction of the arrow A 172  of  FIG. 17 , so the cam part  84   a  of the link member  84  rolls against and contacts the recessed part  82   b  of the clamp shaft  82  while making the clamp shaft  82  move downward in the Z-direction. Due to this, the step difference  82   c  of the clamp shaft  82  pushes the clamp shaft holding part  71   h  of the supporting section  71  downward, so the supporting section  71  is made to separate from the mounting part  61  in the Z-direction. As a result, the contact head  7  is released from the fastened state by the fastening mechanism part  8  and temporarily fastened. After that, the contact head  7  is moved in the opposite direction from the direction shown by the arrow A 131  and arrow A 132  of  FIG. 13  whereby the contact head  7  is detached from the movable arm  6 . In this way, in the IC handler  4  of the present example, the contact head is detached by rotational motion of the clamp levers  81  not directly contacting the contact head  7 . Therefore, even when high temperature tests of IC devices cause the contact head  7  to be heated, it becomes possible to easily and quickly detach the contact head  7 . 
         [0058]    In the above way, the contact head  7  of the IC handler  4  is detachably attached by the fastening mechanism part  8  to the movable arm  6 . In the same way as this, the holder supporting part  53  at the shift unit  5  is detachably attached by the fastening mechanism part  54  to the base part  51  (see  FIG. 1 ).  FIG. 18  is a perspective view showing enlarged only the loading part  5   a  at the shift unit  5  of  FIG. 1 . As shown in  FIG. 18 , the loading part  5   a  of the present example is provided with the above-mentioned base part  51 , plurality of holding parts  52 , and holder supporting part  53  and also a fastening mechanism part  54  detachably attaching the holder supporting part  53  to the base part  51  in a detachable manner. Further, the fastening mechanism part  54  is provided with clamp levers  541  attached to the base part  51  and clamp blocks  542  interposed between the clamp lever  541  and the holder supporting part  53  and pushing the holder supporting part  53  against the base part  51 . 
         [0059]    The clamp levers  541  according to the example of  FIG. 18  are rotated about axes of rotation parallel to the Z-direction whereby they can move between fastening positions for fastening the clamp blocks  542  and releasing positions for releasing the clamp blocks  542 .  FIG. 18  shows clamp levers  541  present at the fastening positions. Further, if the clamp levers  541  are moved to the releasing positions, the clamp blocks  542  are released from the clamp levers  541  and can move in the X-direction. Therefore, by making the clamp blocks  542  separate from the holder supporting part  53  in the X-direction, the holder supporting part  53  can be detached from the base part  51 . After that, another holder supporting part  53  is arranged at the base part  51 , then the clamp levers  541  are made to move again to the fastening positions whereby the other holder supporting part  53  can be attached to the base part  51 . In this way, the IC handler  4  of the present embodiment is designed to enable easy replacement of not only the contact head  7 , but also the holder supporting part  53  in accordance with a change of the array of DUTs. 
         [0060]    The present invention is not limited to only the above embodiments and can be modified in various ways within the scope described in the claims. Further, the dimensions, shapes, material quality, etc. of the above-mentioned parts are just illustrations. Various dimensions, shapes, material qualities, etc. may be employed for achieving the advantageous effects of the present invention. 
       REFERENCE SIGNS LIST 
       [0000]    
       
         
           
               1  IC test system 
               10  base 
               2  test head 
               3  socket 
               3   a  carrying surface 
               4  IC handler 
               5  shift unit 
               5   a  loading part 
               5   b  unloading part 
               51  base part 
               52  holding part 
               53  holder supporting part 
               54  fastening mechanism part 
               6  movable arm 
               61  mounting part 
               7  contact head 
               70  operating section 
               71  supporting section 
               71   a  supply path 
               71   d  supply path 
               72  clamping section 
               73  pushing section 
               8  fastening mechanism part 
               81  clamp lever 
               82  clamp shaft 
               83  horizontal shaft 
               84  link member 
               9  latch member 
             VO supply port 
             VC connection port 
             HO supply port 
             HC connection port