Abstract:
There is provided a heat sink for measuring temperature of electronic component. The heat sink includes a heat radiating plate, a fin, a heat receiving plate, and a temperature detector. The heat radiating plate has a first surface that receives heat from the electronic component. The fin is for radiating heat energy conducting through the heat radiating plate and is connected to the heat radiating plate. The heat receiving plate arranged apart from the heat radiating plate has a second surface movable to be parallel to the first surface. The temperature detector that detects a temperature is disposed on the heat receiving plate.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2009-079985, filed on Mar. 27, 2009, the entire contents of which are incorporated herein by reference. 
       FIELD 
       [0002]    The embodiments discussed herein are related to a heat sink used for, measuring temperature of electronic component. 
       BACKGROUND 
       [0003]    Hereinafter a chip package is referred to as a package including within, for example, an integrated circuit such as a large scale integrated circuit (LSI). As is well known, various kinds of test are applied to a product or prototype for evaluating its performances such as performance depending on temperature. In case of temperature test of an LSI chip package, the LSI chip package is connected to a printed circuit board (PCB) or a print wiring board (PWB) via socket(s) and a heat sink is disposed on the LSI package. A temperature-detecting element such as thermistor(s) for sensing temperature is mounted on the heat sink. When the LSI chip package is energizes for operation, the LSI chip package develops heat. And heat energy of the LSI chip package is conducted to the heat sink. The heat energy is radiated in the air from a fin of the heat sink. Accordingly, in this manner, the temperature of the LSI chip package is lowered. 
         [0004]    A fan attached to the heat sink generates an air stream along the fin of the heat sink. The more air volume of the air stream is increased, the more radiation efficiency of the heat energy of the heat ink is improved. As a result, the radiation efficiency of the heat of the heat sink is adjusted by controlling the air volume of the air stream. During conducting a temperature test, the air volume of the air stream is controlled according to output data corresponding to the temperature measured by the thermistor. As a result, the temperature of the LSI chip package is set to a specific temperature or the around the temperature. And then, operation check all over the LSI chip package is executed. 
         [0005]    Detecting the temperature of the LSI chip package via the heat sink, the thermistor is mounted on the heat sink as described above. Since heat energy of the LSI chip package is conducted to the heat sink and the heat energy is radiated in the air from the heat sink, the temperature of the heat sink is lowered than the actual temperature of the energized LSI chip package. Accordingly, the thermistor cannot accurately detect the actual temperature of the LSI chip package, which may introduce inaccuracy of the temperature test.
   [Patent Document 1] Japanese Laid-open Patent Publications No. 2007-234753   [Patent Document 2] Japanese Laid-open Patent Publications No. 2003-234440   
 
       SUMMARY 
       [0008]    According to an aspect of the invention, a heat sink includes: a heat radiating plate having a first surface that receives heat from the electronic component; a fin connected to heat radiating plate, and radiates heat energy conducting through the heat radiating plate, connected to the heat radiating plate; a heat receiving plate arranged apart from the heat radiating plate and having a second surface movable to be parallel to the first surface; and a temperature detector that detects a temperature and disposed on the heat receiving plate. 
         [0009]    The object and advantages of the invention will be realized and attained by means of the elements and combinations particularly pointed out in the claims. 
         [0010]    It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0011]      FIG. 1  is a perspective view schematically illustrating the structure of a temperature testing device according to an embodiment; 
           [0012]      FIG. 2  is a cross sectional view taken along the line II-II of  FIG. 1 ; 
           [0013]      FIG. 3  is a partial enlarged cross sectional view of  FIG. 2 ; 
           [0014]      FIG. 4  is a partial enlarged cross sectional view taken along the line IV-IV of  FIG. 3 ; 
           [0015]      FIG. 5  is a cross sectional view taken along the line V-V of  FIG. 4 ; 
           [0016]      FIG. 6  is a block diagram illustrating a control system of the temperature testing device; 
           [0017]      FIG. 7  is a cross sectional view schematically illustrating an appearance in which an LSI (Large Scale Integrated circuit) chip package is disposed on a socket; 
           [0018]      FIG. 8  is a cross sectional view schematically illustrating an appearance in which a heat sink is attached on the printed circuit board; 
           [0019]      FIG. 9  is a cross sectional view schematically illustrating an appearance in which the heat sink is attached on the printed circuit board; 
           [0020]      FIG. 10  is a flowchart illustrating a processing flow of a control circuit; 
           [0021]      FIG. 11  is a graph and a chart illustrating the processing flow of the control circuit; 
           [0022]      FIG. 12  is a perspective view schematically illustrating a temperature testing device according to another concrete example; 
           [0023]      FIG. 13  is a cross sectional view taken along the line XIII-XIII of  FIG. 12 ; 
           [0024]      FIG. 14  is a cross sectional view schematically illustrating an appearance in which an LSI chip packaged is disposed on a socket; 
           [0025]      FIG. 15  is a cross sectional view schematically illustrating an appearance in which the heat sink is attached on a printed circuit board; 
           [0026]      FIG. 16  is a partial enlarged cross sectional view schematically illustrating a temperature testing device according to still another concrete example; 
           [0027]      FIG. 17  is a partial enlarged cross sectional view taken along the line XVII-XVII of  FIG. 16 ; 
           [0028]      FIG. 18  is a cross sectional view taken along the line XVIII-XVIII of  FIG. 17 ; 
           [0029]      FIG. 19  is a partial enlarged cross sectional view schematically illustrating an appearance in which a temperature detection unit is detached; 
           [0030]      FIG. 20  is a plan view schematically illustrating an appearance in which a heat sink is embedded in a mother board; and 
           [0031]      FIG. 21  is a side view schematically illustrating an appearance in which the heat sink is embedded in the mother board. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0032]    Hereinafter, an embodiment of a heat sink will be described with reference to the accompanying drawings. 
         [0033]      FIG. 1  is a diagram schematically illustrating the structure of a temperature-testing device  11  according to an embodiment. The temperature-testing device  11  is equipped with a print wiring board or a printed circuit board  12 . For example, a resin substrate or the like is used for the printed circuit board  12 . A socket  13  is attached on a face of the printed circuit board  12 . The socket  13  is formed to have a flat rectangular solid shape or a rectangular plate. A pair of attachment members  14  rise from the face of the printed circuit board  12  outside the socket  13 . A heat sink  15  in a horizontal posture is supported by the attachment members  14  and disposed above the socket  13 . The attachment member  14  is made of, for example, a metal material. 
         [0034]    The heat sink  15  is equipped with a radiator plate  16  spreading in parallel with the face of the printed circuit board  12 . A lower face of the radiator plate  16  faces the upper face of the socket  13  as illustrated in  FIG. 1 . A plurality of fins  17  are firmly fixed to the radiator plate  16  and each of the fins  17  rises in the vertical direction from the face of the radiator plate  16 . The fins  17  are arranged so as to be in parallel to each other. Accordingly, a plurality of air passages extending in a same direction are partitioned or defined between the adjacent fins  17 . At both ends of the radiator plate  16 , protruding pieces  18  are formed so as to protrude in opposite directions to each other from side faces of the radiator plate  16 , where one of pieces  18  behind a fun unit  19  is not illustrated in  FIG. 1 . The radiator plate  16 , the fins  17 , and the protruding pieces  18  are made of heat conductive material such as aluminum, copper, or the like. 
         [0035]    Each of the protruding pieces  18  engages with or interlocks with a cutout  14   a  formed at an inner end of the attachment member  14  individually. The upper face of the protruding piece  18  has contact with a claw  14   b  of the attachment member  14  when the protruding pieces  18  engage with the cutout  14   a.  Since the claws  14   b  are capable of elastically deforming at engaging with the protruding pieces  18 , the heat sink  15  may be set to and released from the attachment members  14 . The fan unit  19  is attached at an end of the heat sink  15  as illustrated in  FIG. 1 . A fan or an air blower (not depicted) is arranged within a housing  19   a  of the fan unit  19  for generating an air circulation along interspaces between the fins  17 . It is also preferable for the fan unit  19  to be disposed on or fixed to, for example, the printed circuit board  12 . 
         [0036]      FIG. 2  is a diagram schematically illustrating the structure of the heat sink  15  according to the first embodiment. Conductive pads  21  are disposed in a matrix manner on the surface of the printed circuit board  12 . A plurality of detection probes  22  are arranged within the socket  13 . An end of each of the detection probes  22  has contact with each of the conductive pads  21  one for one. The detection probe  22  corresponds to the conductive pad  21  to be one to one. The socket  13  includes a socket main body  23  having a flat rectangular solid shape. The socket main body  23  has through-holes  24  penetrating from the upper to lower surfaces thereof. Each of the detection probes  22  is disposed in the respective through-hole  24  and the detection probes  22  are capable to move orthogonally to the printed circuit board  12 . The detection probe  22  protrudes from the upper and lower surfaces of the socket main body  23 , since an elastic force caused with an elastic member, for example, such as a coil spring  25  is applied to the individual detection probe  22 . An end of the detection probe  22  is pressed to the conductive pad  21  by the operation of the elastic force. 
         [0037]    The lower surface of the radiator plate  16  defines a contact face  26  spreading along a plane P. The contact face  26  is a flat face. Further the contact face  26  spreads in parallel to the surface of the printed circuit board  12 . The outline of the contact face  26  is set larger than the outline of a face of an LSI chip package which is disposed on the face of the socket main body  23  and described below. A recess  27  dents from the plane P of the radiator plate  16  is formed on the lower surface of the radiator plate  1 . The recess  27  is opened toward the upper surface of the socket main body  23 . The contact face  26  spreads continuously around the recess  27 . The center of the recess  27  in  FIG. 2  coincides approximately with, for example, the crossing point of the diagonal lines of the outline of the contact face  26  on the radiator plate  16 . 
         [0038]    The heat sink  15  includes a temperature detection unit  28  disposed in the recess  27 . The temperature detection unit  28  is equipped with a heat receiving plate  29  disposed in the opening of the recess  27 . A predetermined gap is formed between an outer rim of the heat receiving plate  29  and an inner wall surface of the recess  27 . The heat receiving plate  29  has a heat-receiving surface  31  which is separated from the contact face  26  and spreaded in parallel with the plane P. A heat transfer sheet  32  having high heat conductivity is formed on the heat-receiving surface  31  so as to close the opening of the recess  27 . The heat transfer sheet  32  is made of, for example, an aluminum foil. A thermal compound is sandwiched between the heat transfer sheet  32  and the heat-receiving surface  31 , and between the heat transfer sheet  32  and the contact face  26  for example. The outline of the heat transfer sheet  32  is set larger than the outline of a surface of an LSI chip package described below. 
         [0039]    In conjunction with  FIG. 3 , the heat receiving plate  29  is equipped with a metal plate  33  which defines the heat-receiving surface  31  at the lower surface thereof. The metal plate  33  is made of a heat conductive material such as an aluminum plate. The lower surface of a substrate  34  having an insulating property is overlapped with the face of the metal plate  33 . The substrate  34  is made of, for example, a heat conductive material such as a resin plate and attached on the upper surface of the metal plate  33  by, for example, a joining material  34   a  having high heat conductivity. The joining material  34   a  is made of, for example, a thermally-conductive compound. The upper surface of the substrate  34  defines a support face  35  on or by which a temperature detecting element. A thermistor  36  is mounted on the support face  35 . 
         [0040]    Referring to  FIG. 4 , the vicinity of the thermistor  36  will be explained. The therminstor  36  includes electrode terminals  37  at both ends. Temperature change causes, for example, a resistance change of the thermistor  36 . Each of the electrode terminals  37  is electrically connected to one of a pair of conductive pads  38  respectively which are formed on the support face  35 . The conductive pads  38  are made of, for example, a conductive material such as copper or the like, and are connected to the electrode terminals  37 , for example, with solder materials  39 . Each of electrical leads  41  is respectively wired to each of the solder materials  39 . Each of the electrical leads  41  is connected to the corresponding one of the electrode terminals  37 . For example, the electrical leads  41  are laid along within a groove  42  formed on the radiator plate  16  and are withdrawn outside the radiator plate  16 . The groove  42  extends preferably to the outline of the radiator plate  16  from the recess  27 . The electrical leads  41  are connected to a control circuit described below. 
         [0041]    The heat receiving plate  29  is coupled with the radiator plate  16  in a displacement manner in the direction perpendicular to the plane P. The movement of the heat receiving plate  29  is allowed by a coupling mechanism  43  which is equipped with, for example, four bolts  44 . The bolts  44 , preferably made of metal material, are disposed to be adjacent to the four corners on the diagonal lines of the outline of the heat receiving plate  29 . The heat receiving plate  29  is fixed to distal ends of the bolt  44  and displacement toward to the socket  13  of the plate  29  is regulated a regulation mechanism in which each head  44   a  of bolts  44  has portion larger in a diameter than that of hole corresponding to the bolt  44 . Shafts  44   b  of the bolts  44  penetrate the radiator plate  16 . The coupling mechanism  43  is equipped with elastic members such as coil springs  45  attached to each of the shafts  44   b  between the heat receiving plate  29  and the radiator plate  16 . The coil springs  45  give an elastic force to keep the heat receiving plate  29  away from the radiator plate  16 . 
         [0042]    The heat-receiving surface  31  overlaps a plane P 1  regulated by the lower surface of the plane P based on the elastic force of the coil spring  45 . Displacement of the heat receiving plate  29  is regulated based on the head  44   a  at the position as described above. Since the support face  35  is disposed at the front or upper side of the plane P, the thermistor  36  is surrounded by the inner wall face of the recess  27 . In this manner, an air layer or air space is formed between the support face  35  and the radiator plate  16 , that is, the bottom face of the recess  27 . Accordingly, the air layer is kept within a space formed with the support face  35  and the plate  16  and heat energy from the plate  16  to the heat receiving plate  29  is remarkably restrained from conducting or dissipating. In addition, since the opening of the recess  27  is shielded by the heat transfer sheet  32 , air circulation between outside and inside of the recess  27  is almost blocked, or a space such like an air chamber is provided in the recess  27 . As a result, the thermistor  36  may detect the temperature of the heat receiving plate  29  with a high accuracy. 
         [0043]    Referring to  FIG. 5 , detail around the recess  27  will be explained. Metal films  46  are formed on the upper and lower surfaces of the substrate  34 . The metal film  46  is made of a metal material or a heat conductive material, for example, such as copper or the like. Through holes  47  are bored so as to penetrate between the upper and lower surfaces of the substrate  34 . On an inner wall of each through-hole  47 , a conductive wall  48  is provided so as to configure a cylindrical shape, for example, in which a conductive material  49  is filled. The conductive wall  48  and the conductive material  49  are made of a metal material or a heat conductive material, such as copper or the like. The conductive wall  48  and the conductive material  49  are connected to the metal films  46  at the upper and lower surfaces of the substrate  34 . Accordingly, the through-holes  47  may facilitate the heat conduction between the upper and lower surfaces of the metal film  46  disposed on the upper and lower surfaces of the substrate  34 . 
         [0044]    As described above, the radiator plate  16 , the fins  17 , and the protruding pieces  18  of the heat sink  15  are made of a metal material. Each protruding piece  18  is coupled with each attachment member  14 , which is made of a metal material. Since the heat receiving plate  29  is separated from the radiator plate  16  as described above, the radiator plate  16 , the fins  17 , the protruding pieces  18 , and the attachment members  14  may also function as an electromagnetic shield of the temperature detection unit  28 . Accordingly, even when, for example, a noise such as an electromagnetic wave is operated to the heat sink  15 , the thermistor  36  may operates normally. 
         [0045]      FIG. 6  is a diagram illustrating a control system of the temperature testing device  11 . The temperature testing device  11  is equipped with a control circuit  51 . The fan unit  19  and the thermistor  36  are connected to the control circuit  51 . Temperature information is output to the control circuit  51  from the thermistor  36 . The control circuit  51  controls the operation of the fan unit  19  based on the temperature information. Based on a control signal supplied form the control circuit  51 , the rotation number of the fan in the fan unit  19  is adjusted in the fan unit  19 . In this manner, the air volume outputted from the fan is controlled. It is also preferably to switch the fan in the fan unit  19  on or off based on a control signal. The operation of the control circuit  51  is executed based on, for example, a predetermined software program. 
         [0046]    Referring to  FIGS. 7 to 11 , temperature testing device  11  executes a temperature test for a semiconductor package such as an LSI chip package will be explained.  FIG. 7  depicts lower part of the temperature testing device  11  prior to setting the heat sink  15  thereon. At the time, an LSI chip package  55  to be tested is attached on the socket  13 . Each of the ends of the detection probes  22  contacts each of receive conductive pads  56  disposed in a matrix on the lower surface of the LSI package  55 . The conductive pads  56  correspond one to one with the conductive pads  21  on the printed circuit board  12 . The ends of the probes  22  are pressed to the conductive pads  56  of the LSI chip package  55  by the elastic force of the coil springs  25 . 
         [0047]    As depicted in  FIG. 8 , the heat sink  15  is attached or set on the lower part of the temperature testing device  11  including the printed circuit board  12 . Then each cutout  18   a  formed at an outer end of each protruding piece  18  of the heat sink  15  is applied to the claw  14   b  of the attachment member  14 , and the radiator plate  16  is pressed toward the printed circuit board  12 . As a result, the attachment members  14  are elastically deformed in the direction so as to be separated to each other. By pressing the radiator plate  16  further, the protruding piece  18  is received in the cutout  14   a  of the attachment member  14 . When the attachment member  14  returns to the original shape, the claw  14   b  of the attachment member  14  is received on the upper face of the protruding piece  18 . In this manner, the heat sink  15  is attached or set to the attachment member  14  or the lower part of the temperature testing device  11  as illustrated in  FIG. 9 . 
         [0048]    The above described arrangement may facilitate a close mechanical contact between the contact face  26  of the radiator plate  16  and the surface of the LSI chip package  55 , and the heat-receiving surface  31  of the heat receiving plate  29  and the surface of the LSI chip package  55  as illustrated in  FIG. 9 . At the same time, one ends of the detection probes  22  presses the LSI chip package  55  toward the heat sink  15  by the elastic force of the coil springs  25  arranged within the socket  13 . Accordingly, the heat receiving plate  29  is aligned on the upper surface of the plane P. The heat-receiving surface  31  overlaps the plane P. That is, the plane P 1  overlaps the plane P. At the time, the coil spring  45  operates the elastic force for deforming the heat-receiving surface  31  from the upper surface side to the lower surface of the plane P, that is, to the surface of the LSI chip package  55 . 
         [0049]    The spring constant of the coil spring  45  is designed with the thickness of the LSI chip package  55  in mind. When the LSI chip package  55  having the maximum thickness among test targets is measured, the constant of each constant of springs  45  is designed so that the pressing force operating on the surface of the LSI chip package  55  from the heat-receiving surface  31  is preferably equal to or close to the pressing force operating on the surface of the LSI chip package  55  from the contact face  26 . Since the pressing force of the contact face  26  may be equal to the pressing force of operating to the LSI chip package  55  from the one ends of the detection probes  22 , the constant of spring of the coil spring  45  is set so that the pressing force of the heat-receiving surface  31  and the pressing force of the socket  13  are equal. As a result, even when the thickness of the LSI chip package  55  is reduced from the maximum thickness, the pressing force of the heat-receiving surface  31  is kept at a constant value. Regardless of change of the thickness of the LSI chip package  55 , a constant heat thermal resistance is constantly established between the heat-receiving surface  31  and the LSI chip package  55 . 
         [0050]    Prior to a temperature test, a driving current is supplied to the LSI chip package  55  to operate a circuit or circuits in the LSI package  55 . The LSI chip package  55  is heated while operation. At the same time, a driving current is supplied to the fan unit  19 . The fan generates an air stream of a predetermined air volume.  FIG. 10  is a flow chart illustrating the flow of a processing of the control circuit  51 . Setting temperature of the LSI chip package  55  is set in step Si by the control circuit  51  or manually through the control circuit  51 . The set temperature is set at, for example, 70° C. In the temperature test, property of the LSI chip package  55  is usually or mainly verified at the setting temperature. Herein, the setting temperature has a predetermined acceptable range which defines a lower limit temperature and an upper limit temperature within a temperature width around the setting temperature. 
         [0051]    For explaining the following steps in  FIG. 10 , the conduction mechanism of the heat or heat energy generated by the LSI  55  will be explained. Since the surface of the LSI chip package  55  contacts the contact face  26  and the heat-receiving surface  31 , the heat energy of the LSI chip package  55  is conducted from the contact face  26  and the heat-receiving surface  31  to the radiator plate  16  and the heat receiving plate  29 . The heat energy is radiated to the air from the fins  17  via the radiator plate,  16 . On the other hand, the heat energy is conducted to the substrate  34  from the metal plate  33 . The heat energy is transmitted to the metal film  46  on the upper side surface of the substrate  34  from the metal film  46  on the lower side surface of the substrate  34 . At the time, conduction efficiency of the heat energy is improved by the operation of the through-holes  47  depicted in detail in  FIG. 5 . Accordingly, the temperature of support face  35  of the substrate  34  is raised, which causes a resistance change in the thermistor  36 . The thermistor  36  outputs temperature information to the control circuit  51 . 
         [0052]    Now returning to  FIG. 10 , the control circuit  51  obtains temperature information outputted from the thermistor  36  in step S 2 . In S 3 , the control circuit  51  compares the temperature information outputted from the thermistor  36  with the lower limit temperature information. When the temperature information outputted is lower than the lower limit temperature information, the control circuit  51  reduces the air volume of the fan by one level in step S 4 . As illustrated in  FIG. 11 , in the initial step of the operation of the LSI chip package  55 , the air volume of the fan is reduced since a temperature lower than the lower limit temperature is detected. Accordingly, the radiation efficiency of the heat energy of the fins  17  is lowered. Returning to  FIG. 9 , the processing goes back to step S 2  after the processing in S 4 . The control circuit  51  obtains temperature information from the thermistor  36  at, for example, one minutes interval. In this manner, as a result of repeating the processing of step S 2  to S 4 , the temperature of the LSI chip package  55  may be raised. 
         [0053]    When the temperature of the LSI chip package  55  exceeds the lower limit temperature, the process proceeds to step S 5 . The control circuit  51  compares the temperature information from the thermistor  36  with the upper limit temperature information. When the temperature information from the thermistor  36  exceeds the upper limit temperature information, the control circuit  51  increases the air volume of the fan by one level in step S 6 . The radiation efficiency of the heat energy of the fins  17  may be improved. Accordingly, the LSI chip package  55  may be cooled, and then the temperature of the LSI chip package  55  may be lowered. As illustrated in  FIG. 10 , the processing goes back to step S 2  after S 6  is operated. As a result the processing of steps S 2  to S 6  may be repeated. 
         [0054]    On the other hand, when the temperature information from the thermistor  36  falls below the upper limit temperature information, it is judged that the temperature is within the acceptable range (S 5 , No). Then, the air volume is kept as it is (S 7 ), and the process proceeds to step S 8 . As far as the temperature is kept in the acceptable range, the control circuit  51  intends to keep the air volume of the fan in step S 7 . Under this situation, the property or performance of the LSI chip package  55  is verified. In processing in  FIG. 10 , the completion of the measure is determined in S 8 . When the verifying of the property is not finished, the processing retunes to step S 2 . The processing of step S 2  to S 8  is repeated. When verifying of the property is finished (S 8 , Yes), the processing proceeds to step S 9  in which the control circuit  51  determines whether to change of the setting temperature of the LSI chip package  55 . When it is judged that it is desired to newly set the setting temperature for verification of the performance of the LSI chip package  55  (YES in S 9 ), the processing goes back to step S 1 . On the other hand, when it is judged that it is not necessary to newly set the setting temperature (NO in S 9 ), the processing is finished. 
         [0055]    In the temperature testing device  11 , the heat sink  15  is received by the LSI chip package  55  by the contact face  26  of the heat radiator plate  16  and the heat-receiving surface  31  of the heat receiving plate  29 . The heat energy of the LSI chip package  55  is conducted to the radiator plate  16  from the contact face  26  and the heat energy is radiated to the air from the fins  17 . In this manner, the LSI chip package  55  is cooled. At the same time, the heat energy of the LSI chip package  55  is conducted to the heat receiving plate  29  from the heat-receiving surface  31 . Since the heat-receiving surface  31  is separated from the contact face  26 , the heat energy of the LSI chip package  55  is effectively conducted to the thermistor  36 . The thermistor  36  may detect the temperature of the LSI chip package  55  with a high accuracy. 
         [0056]      FIG. 12  is a diagram schematically illustrating the structure of a temperature testing device  11   a  including a heat sink according to the second embodiment. For the clarity of the description, the same reference numeral is used to denote the same or similar element, part, configuration or structure as that n the first embodiment and the explanation thereof will be omitted. The temperature testing device  11   a  is equipped with a heat sink  15   a.  The heat sink  15   a  is equipped with a plate  61  spreading in parallel with the surface of the printed circuit board  12 . The plate  61  is supported by the attachment members  14 . An opening  62  is formed on the plate  61  and the fins  17  are disposed on the radiator plate  16  across the opening  62 . The plate  61  is coupled with the radiator plate  16  with a coupling mechanism  63  which is equipped with, for example, four bolts  64 , while only two bolts  64  are illustrated. The bolts  64  are disposed to be adjacent to the four corners on the diagonal lines on the surface of the radiator plate  16 . A distal end of the bolt  64  is fixed to the radiator plate  16 . The plate  61  and the bolt  64  are made preferably of a metal material. 
         [0057]      FIG. 13  is a cross-section diagram along the line XIII-XIII in  FIG. 12  and illustrates schematically the structure of the heat sink  15   a.  Referring to  13 , the heat sink  15   a  will be explained. Each of the bolts  64  has a head  64   a  at an end of bolt shank  64   b  and a screwed portion at the other end of the bolt shank  64   b.  The screwed portion has a smaller in diameter than that of the bolt shank. Each of the coupling mechanism  63  including the bolt  64  and an elastic member such as a coil spring  65 . The bolt  64  passes through a through-hole provided to the plate  61  and the coil spring  65  as illustrated in  FIG. 13 . The screwed portion of the bolt  65  is screwed in a screw provided on the radiator plate  61 . The coil spring  65  pushes the plate  61  away from the radiator plate  16 . As illustrated in  FIG. 13 , the four coupling mechanisms  63  are disposed out of an area in which the fins  17  are arranged. Since the length of each bolt shank  64   b  are substantially same, the plate  61  and the radiator plate  16  are parallel each other. The plate  61  is connected or fixed to both of the attachment members  14  because the end of the plate  61  may be accepted individually by a groove or the cutout  14   a  provided at a sidewall of each of the attachment members  14 . At the time, claws  14   b  of the attachment members  14  contact to the upper surface of the plate  61 . In this manner, the heat sink  15   a  is attached through the plate  61  on the printed circuit board  12  in the horizontal posture. 
         [0058]    Next, a socket  66  mounted on the printed circuit board  12  will be described. The socket  66  is equipped with a socket main body  67  having, for example, a flat rectangular solid shape or a rectangular plate shape. A plurality of terminal pines  68  are disposed in a matrix manner on the lower surface of the socket main body  67 . The terminal pines  68  protrude from the lower surface of the socket main body  67  and forms an arrangement as a pin grid array. Each of the terminal pins  68  is secured to a through-hole  69  formed on the printed circuit board  12  by a solider material  71 . The upper surface or face of the socket main body  67  faces the contact face  26  and the heat-receiving surface  31 . A plurality of through-holes  72  individually corresponding to each of the terminal pins  68  are formed on the socket main body  67 . 
         [0059]    Referring to  FIGS. 14 and 15 , the temperature test of the LSI chip package will be explained. First, the attachment member  14  with the LSI chip package  55  mounted on the socket  66  is prepared as illustrated in  FIG. 14 , where the heat sink  15   a  is detached from the attachment member  14 . As illustrated in  FIG. 14 , a plurality of terminal pins  73  are arranged in a matrix manner on the bottom surface of the LSI chip package  55 . The terminal pins  73  are inserted in the respective through-holes  72  of the socket  66  for attaching the LSI chip package  55 . Each of the terminal pins  73  is electrically connected to each of the terminal pins  68  in the respective through-hole  72  by the operation of a lock mechanism (not depicted) of the socket  66 . In this manner, the LSI chip package  55  is connected to the printed circuit board  12  via the socket  66 . 
         [0060]    Next the heat sink  15   a  is attached on the printed circuit board  12  as illustrated in  FIG. 15 . When attaching the heat sink  15   a,  cutouts  61   a  formed at both ends of the plate  61  are pressed to the claws  14   b  of the attachment members  14 . Further pressing the plate  61  toward the printed circuit board  12 , the attachment members  14  are elastically deformed in the direction away from each other similarly to the aforementioned case. As a result, the both ends of the plate  61  are received in the respective cutouts  14   a  of the attachment members  14 . When the attachment members  14  return to the original shapes or the original positions, the claws  14   b  of the attachment member  14  are received on the faces of the plate  61 . In this manner, the heat sink  15   a  is attached to the attachment member  14 . 
         [0061]    The heat sink  15   a  is pressed on the surface of the LSI chip package  55  at the contact face  26  of the radiator plate  16  and the light receiving face  31  of the heat receiving plate  29 . Since the radiator plate  16  is pushed up in the direction away from the face of the printed circuit board  12 , the radiator plate  16  comes close to the plate  61 . Accordingly, the contact face  26  of the radiator plate  16  is pressed on the surface of the LSI chip package  55  by the operation of the elastic force of the coil springs  65 . At the same time, the heat receiving plate  29  is pushed up in the direction away from the face of the printed circuit board  12 . As a result, the heat receiving plate  29  is positioned at the face side of the plane P. The heat receiving plate  29  overlaps the plane P, that is, the contact face  26 . The coil spring  45  operates an elastic force for displacing the heat-receiving surface  31  from the front side of the plane P to the reverse side thereof, that is, to the surface of the LSI chip package  55 . 
         [0062]    When setting the constant of spring of the coil spring  45 , similarly to the aforementioned first embodiment, the thickness of the LSI chip package  55  is considered. When the LSI chip package  55  having the maximum thickness among test targets is sandwiched between the heat sink  15   a  and the socket  13   a,  the spring constant is set so that the pressing force operating on the surface of the LSI chip package  55  from the heat-receiving surface  31  becomes equal to the pressing force operating on the surface of the LSI chip package  55  from the contact face  26 . As a result, even when the thickness of the LSI chip package  55  is reduced from the maximum thickness, the pressing force of the heat-receiving surface  31  is always kept at a constant value. Regardless of change thickness of the LSI chip package  55 , a constant thermal resistance is always established between the heat-receiving surface  31  and the LSI chip package  55 . 
         [0063]    In the temperature testing device  11   a,  similarly to the aforementioned temperature testing device  11 , a temperature test of the LSI chip package  55  is executed. The heat sink  15   a  is received on the contact face  26  of the radiator plate  16  and the heat-receiving surface  31  of the heat receiving plate  29 . The heat energy of the LSI chip package  55  is conducted to the radiator plate  16  from the contact face  26 . The heat energy is radiated to the air from the fins  17 . In this manner, the LSI chip package  55  is cooled. At the same time, the heat energy of the LSI chip package  55  is conducted to the heat receiving plate  29  from the heat-receiving surface  31 . Since the heat-receiving surface  31  is separated from the contact face  26 , the heat energy of the LSI chip package  55  is effectively conducted to the thermistor  36 . The thermistor  36  may detect the temperature of the LSI chip package  55  with a high accuracy. 
         [0064]      FIG. 16  is a diagram schematically illustrating the structure of a heat sink  15   b  according to a third embodiment of the invention. In the heat sink  15   b,  the temperature detection unit  28  is attached to the radiator plate  16  in a detachable manner. The temperature detection unit  28  is equipped with a support plate  81  made of, for example, a resin supporting the shaft  44   b  of the bolt  44 . The support plate  81  spreads in parallel with the plane P. The support plate  81  is received on the bottom face of the recess  27 . An engage member  82  is coupled with the support plate  81  in a rotatable manner about a rotation shaft perpendicular to the face of the support plate  81 . The engage member  82  is equipped with a shaft  82   a  rising from the face of the support plate  81 , and an engage part  82   b  coupled to the shaft  82   a.    
         [0065]    In conjunction with  FIG. 17 , the shaft  82   a  is disposed in a through-hole  83  formed on the radiator plate  16 . The through-hole  83  extends, for example, in the width direction of the radiator plate  16  to be spindly shaped. The engage part  82   b  extends, for example, in the back and forth direction of the radiator plate to be spindly shaped. The both ends of the engage part  82   b  are supported on the face of the radiator plate  16  outside the outline of the through-hole  83 . In conjunction with  FIG. 18 , the heads  44   a  of the bolts  44  are received on the face of the support plate  81 . The head  44   a  of the bolt  44  is received in a through-hole  84  formed on the radiator plate  16 . Protrusion of the head  44   a  from the face of the radiator plate  16  is prevented. The head  44   a  is disposed at a position closer to the printed circuit board  12  than a rotation pathway of the engage part  82   b.  In addition, the same reference numeral is used to denote the same constitution and structure as those of the aforementioned heat sinks  15 ,  15   a.    
         [0066]    As illustrated in  FIG. 19 , when detaching the temperature detection unit  28 , when the engage part  82   b  is rotated by 90 degrees about the shaft  82   a,  the engage part  82   b  extends in the same direction as the through-hole  83 . In this manner, the engage part  82   b  is disposed in the outline of the through-hole  83 . At the time, when the engage part  82   b  is received in the through-hole  83 , the temperature detection unit  28  is detached from the radiator plate  16 . Note that when attaching the temperature detection unit  28 , the inverse operation as the aforementioned detaching operation may be executed. According to the heat sink  15   b,  the same effects as those of the aforementioned embodiments can be provided. In addition, the temperature detection unit  28  can be simply exchanged when, for example, adjusting the coil spring  45 . 
         [0067]    As illustrated in  FIG. 20 , the heat sinks  15  to  15   b  may be independently embedded in a print substrate unit such as a motherboard  85 . The mother board  85  is embedded in an electronic apparatus such as, for example, a server computer. The mother board  85  is equipped with a print substrate  86 . In conjunction with  FIG. 21 , for example, the heat sink  15  is disposed on an LSI chip package  87  on the print substrate  86 . When disposing the heat sink  15 , for example, an attachment member (not depicted) rising from the face of the print substrate  86  may be used. A control circuit (not depicted) on the print substrate  86  is connected to the thermistor  36  and the fan unit  19  on the heat sink  15 . The aforementioned temperature test is executed based on the control of the control circuit. In this manner, the heat sinks  15  to  15   b  of the invention are used for executing a temperature test of the mother board  85  already embedded in an electronic apparatus. 
         [0068]    All examples and conditional language recited herein are intended for pedagogical purposes to aid the reader in understanding the invention and the concepts contributed by the inventor to furthering the art, and are to be construed as being without limitation to such specifically recited examples and conditions, nor does the organization of such examples in the specification relate to a showing of the superiority and inferiority of the invention. Although the embodiments of the present inventions have been described in detail, it should be understood that the various changes, substitutions, and alterations could be made hereto without departing from the spirit and scope of the invention.