Patent Publication Number: US-2023135191-A1

Title: Electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority from Japanese Patent Application No. 2021-179446 filed on Nov. 2, 2021, the contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to an electronic device. 
     BACKGROUND ART 
     In the related art, as a device configured to cool a heat-generating component of a semiconductor device (for example, a CPU or the like) mounted on an electronic device, suggested is a heat pipe configured to transport heat by using a phase change of a working fluid (for example, refer to Patent Literatures 1 and 2). 
     As an example of the heat pipe, known is a loop type heat pipe including an evaporator configured to vaporize a working fluid by heat of a heat-generating component and a condenser configured to cool and condense the vaporized working fluid, in which the evaporator and the condenser are connected by a liquid pipe and a vapor pipe configured to form a loop-shaped flow path. In the loop type heat pipe, the working fluid flows in one direction in the loop-shaped flow path. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: JP6291000B 
         Patent Literature 2: JP6400240B 
       
    
     SUMMARY OF INVENTION 
     In the meantime, in the loop type heat pipe, it is desired to be able to vary heat dissipation performance (cooling performance) according to a use situation, a use environment, and the like, and in this respect, there is still room for improvement. 
     Certain embodiment provides an electronic device. 
     The electronic device comprises: 
     a loop type heat pipe including a loop-shaped flow path in which a working fluid is enclosed; 
     a first magnet provided to the loop type heat pipe; 
     a heat dissipation plate thermally connectable to the loop type heat pipe; 
     a second magnet provided to the heat dissipation plate and provided to face the first magnet; and 
     a support member that movably supports the heat dissipation plate so that a distance between the loop type heat pipe and the heat dissipation plate can be varied in response to a change in magnetic force of the first magnet. 
     According to one aspect of the present invention, the effect capable of varying the heat dissipation performance is exhibited. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1 A  is a schematic cross-sectional view (a cross-sectional view taken along a line  1 - 1  in  FIG.  3   ) showing an electronic device of one embodiment. 
         FIG.  1 B  is an enlarged cross-sectional view of a part of the electronic device shown in  FIG.  1 A . 
         FIG.  2    is a schematic cross-sectional view showing the electronic device of one embodiment. 
         FIG.  3    is a schematic plan view showing the electronic device of one embodiment. 
         FIG.  4    is a schematic cross-sectional view showing the electronic device of one embodiment. 
         FIG.  5    is a schematic cross-sectional view showing an electronic device of a modified embodiment. 
         FIG.  6    is a schematic cross-sectional view showing an electronic device of a modified embodiment. 
         FIG.  7    is a schematic cross-sectional view showing an electronic device of a modified embodiment. 
         FIG.  8    is a schematic cross-sectional view showing an electronic device of a modified embodiment. 
         FIG.  9    is a schematic cross-sectional view showing an electronic device of a modified embodiment. 
         FIG.  10    is a schematic plan view showing an electronic device of a modified embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, one embodiment will be described with reference to the accompanying drawings. 
     Note that, for convenience sake, in the accompanying drawings, a characteristic part is enlarged so as to easily understand the feature, and the dimension ratios of the respective constitutional elements may be different in the respective drawings. Further, in the cross-sectional views, hatching of some members is shown in a satin form and hatching of some members is omitted, so as to easily understand a sectional structure of each member. In the respective drawings, an X-axis, a Y-axis, and a Z-axis orthogonal to each other are shown. In descriptions below, for convenience sake, a direction extending along the X-axis is referred to as ‘X-axis direction’, a direction extending along the Y-axis is referred to as ‘Y-axis direction’, and a direction extending along the Z-axis is referred to as ‘Z-axis direction’. Note that, in the present specification, ‘in a top view’ means seeing a target object in the Z-axis direction, and ‘planar shape’ means a shape of a target object as seen in the Z-axis direction. 
     (Overall Configuration of Electronic Device M 1 ) 
     As shown in  FIGS.  1 A and  2   , an electronic device M 1  includes a loop type heat pipe  10 , a heat dissipation plate  30  thermally connectable to an outer surface of the loop type heat pipe  10 , and a support member  40  configured to movably support the heat dissipation plate  30 . The electronic device M 1  includes a first magnet  50  provided in the loop type heat pipe  10  and a second magnet  60  provided in the heat dissipation plate  30 . The electronic device M 1  includes, for example, a heat conductive member  70  provided between the loop type heat pipe  10  and the heat dissipation plate  30 , and a housing  80 . 
     As shown in  FIGS.  3  and  4   , the electronic device M 1  includes, for example, a heat-generating component  16  thermally connected to the loop type heat pipe  10 . As shown in  FIG.  4   , the electronic device M 1  includes, for example, a wiring substrate  19  on which the heat-generating component  16  is mounted. The electronic device M 1  is, for example, an electronic device on which the heat-generating component  16  and a device for cooling the heat-generating component  16  are mounted. As the device for cooling the heat-generating component  16 , known is a heat pipe configured to transport heat by using a phase change of a working fluid. As an example of the heat pipe, the loop type heat pipe  10  may be exemplified. 
     As shown in  FIGS.  1 A and  2   , in the electronic device M 1 , the heat dissipation plate  30  is movably supported by the support member  40  so that a distance between the outer surface of the loop type heat pipe  10  and the heat dissipation plate  30  can be varied in response to a change in magnetic force of the first magnet  50 . At this time, the heat dissipation plate  30  is supported to be movable in the Z-axis direction between a state in which the heat dissipation plate is thermally connected to the outer surface of the loop type heat pipe  10  (refer to FIA. 1 A) and a state in which the heat dissipation plate is not thermally connected to the outer surface of the loop type heat pipe  10  (refer to  FIG.  2   ). 
     (Configuration of Housing  80 ) 
     The housing  80  is formed in a box shape. The housing  80  has, for example, a plurality of wall parts  81 . Note that, in  FIGS.  1 A and  2   , only one wall part  81  of the plurality of wall parts  81  is shown. The housing  80  has a structure closed by the plurality of wall parts  81 . The housing  80  is configured to accommodate, for example, electronic components such as the heat-generating component  16  (refer to  FIG.  4   ) and the wiring substrate  19  (refer to  FIG.  4   ), the loop type heat pipe  10 , the heat dissipation plate  30 , the support member  40 , the first magnet  50 , the second magnet  60 , and the heat conductive member  70 . 
     (Configuration of Loop Type Heat Pipe  10 ) 
     As shown in  FIG.  3   , the loop type heat pipe  10  includes an evaporator  11 , a vapor pipe  12 , a condenser  13  and a liquid pipe  14 . 
     The evaporator  11  and the condenser  13  are connected by the vapor pipe  12  and the liquid pipe  14 . The evaporator  11  has a function of vaporizing a working fluid C to generate vapor Cv. The vapor Cv generated in the evaporator  11  is sent to the condenser  13  via the vapor pipe  12 . The condenser  13  has a function of condensing the vapor Cv of the working fluid C. The condensed working fluid C is sent to the evaporator  11  via the liquid pipe  14 . The vapor pipe  12  and the liquid pipe  14  are configured to form a loop-shaped flow path  15  through which the working fluid C or the vapor Cv is caused to flow. In the flow path  15 , the working fluid C is enclosed. 
     The vapor pipe  12  is formed, for example, by an elongated pipe body. The liquid pipe  14  is formed, for example, by an elongated pipe body. In the present embodiment, the vapor pipe  12  and the liquid pipe  14  are the same in dimension (i.e., length) in a length direction, for example. Note that, the length of the vapor pipe  12  and the length of the liquid pipe  14  may be different from each other. For example, the length of the vapor pipe  12  may be shorter than the length of the liquid pipe  14 . Here, in the present specification, the ‘length direction’ of the evaporator  11 , the vapor pipe  12 , the condenser  13  and the liquid pipe  14  is a direction that coincides with a direction (refer to an arrow in the drawing) in which the working fluid C or vapor Cv flows in each member. In addition, in the present specification, the ‘same’ includes not only a case where comparison targets are exactly the same but also a case where there is a slight difference between the comparison targets due to influences of dimensional tolerances and the like. 
     As shown in  FIG.  4   , the evaporator  11  is fixed in close contact with the heat-generating component  16 . The evaporator  11  is fixed to an upper surface of the heat-generating component  16 , for example. The evaporator  11  has, for example, a plurality of (four, in the present embodiment) attaching holes  11 X. Each attaching hole  11 X is formed to penetrate through the evaporator  11  in a thickness direction (here, Z-axis direction). The evaporator  11  is fixed to the wiring substrate  19  by, for example, a screw  17  inserted in each attaching hole  11 X and a nut  18  screwed onto the screw  17 . The heat-generating component  16  is mounted on the wiring substrate  19 . The heat-generating component  16  is mounted on the wiring substrate  19  by bumps  16 A, for example. A lower surface of the evaporator  11  is in close contact with the upper surface of the heat-generating component  16 . As the heat-generating component  16 , for example, a semiconductor device such as a CPU (Central Processing Unit) chip or a GPU (Graphics Processing Unit) chip may be used. 
     As shown in  FIG.  3   , the working fluid C in the evaporator  11  is vaporized by heat generated by the heat-generating component  16 , and vapor Cv is accordingly generated. The vapor Cv generated in the evaporator  11  is introduced into the condenser  13  via the vapor pipe  12 . 
     The vapor pipe  12  has a pair of pipe walls  12   w  provided on both sides in a width direction orthogonal to the length direction of the evaporator  12 , in a top view, and a flow path  12   r  provided between the pair of pipe walls  12   w , for example. The flow path  12   r  is formed to communicate with an internal space of the evaporator  11 . The flow path  12   r  is a part of the loop-shaped flow path  15 . 
     The condenser  13  has a heat dissipation plate  13   p  whose area is increased for heat dissipation, and a flow path  13   r  provided in the heat dissipation plate  13   p , for example. The flow path  13   r  has a flow path r 1  formed to communicate with the flow path  12   r  and extending in the Y-axis direction, a flow path r 2  bent from the flow path r 1  and extending in the X-axis direction, and a flow path r 3  bent from the flow path r 2  and extending in the Y-axis direction. The flow path  13   r  (flow paths r 1  to r 3 ) is a part of the loop-shaped flow path  15 . The condenser  13  has pipe walls  13   w  provided on both sides in a direction orthogonal to a length direction of the flow path  13   r , i.e., flow paths r 1  to r 3 , in the top view. The vapor Cv introduced via the vapor pipe  12  is condensed in the condenser  33 . The working fluid C condensed in the condenser  13  is guided to the evaporator  11  through the liquid pipe  14 . 
     The liquid pipe  14  has a pair of pipe walls  14   w  provided on both sides in the width direction orthogonal to the length direction of the liquid pipe  14 , in the top view, and a flow path  14   r  provided between the pair of pipe walls  14   w , for example. The flow path  14   r  is formed to communicate with the flow path  13   r  (specifically, the flow path r 3 ) of the condenser  13  and the internal space of the evaporator  11 . The flow path  14   r  is a part of the loop-shaped flow path  15 . 
     In the loop type heat pipe  10 , the heat generated by the heat-generating component  16  is transferred to the condenser  13  and dissipated in the condenser  13 . Thereby, the heat-generating component is  16  is cooled, and the temperature rise of the heat-generating component  16  is suppressed. 
     Here, as the working fluid C, a fluid having a high vapor pressure and a high latent heat of vaporization is preferably used. By using such working fluid C, it is possible to effectively cool the heat-generating component  16  by the latent heat of vaporization. As the working fluid C, ammonia, water, freon, alcohol, acetone or the like can be used, for example. 
     (Specific Structure of Condenser  13 ) 
       FIGS.  1 A and  2    show a cross section of the loop type heat pipe  10  taken along a line  1 - 1  of  FIG.  3   . This cross section is a plane orthogonal to the direction in which the working fluid C flows in the condenser  13  and the liquid pipe  14 . 
     As shown in  FIGS.  1 A and  2   , the condenser  13  has a structure where metal layers  21 ,  22  and  23  of three layers, for example, are stacked. In other words, the condenser  13  has a structure where the metal  22 , which is an inner metal layer, is stacked between the metal layers  21  and  23 , which are a pair of outer metal layers. The inner metal layer of the condenser  13  of the present embodiment is configured by only one metal layer  22 . 
     Each of the metal layers  21  to  23  is a copper (Cu) layer having excellent thermal conductivity. The plurality of metal layers  21  to  23  are directly bonded to each other by solid-phase bonding such as diffusion bonding, pressure welding, friction pressure welding and ultrasonic bonding. Note that, in  FIGS.  1 A,  1 B and  2   , the metal layers  21  to  23  are identified by solid lines for easy understanding. For example, when the metal layers  21  to  23  are integrated by diffusion bonding, interfaces of the respective metal layers  21  to  23  may be lost and boundaries may not be clear. As used herein, the solid-phase bonding is a method of heating and softening bonding target objects in a solid-phase (solid) state without melting the same, and then further heating, plastically deforming and bonding the bonding target objects. Note that, the metal layers  21  to  23  are not limited to the copper layers and may also be formed of stainless steel, aluminum, magnesium alloy or the like. In addition, for some of the stacked metal layers  21  to  23 , a material different from the other metal layers may also be used. A thickness of each of the metal layers  21  to  23  may be set to about 50 μm to 200 μm, for example. Note that, some of the metal layers  21  to  23  may be each formed to have a thickness different from the other metal layers, and all the metal layers may be formed to have thicknesses different from each other. 
     As shown in  FIG.  1 B , the condenser  13  is configured by the metal layers  21  to  23  stacked in the Z-axis direction, and has the flow path  13   r  and the pair of pipe walls  13   w  provided on both sides of the flow path  13   r  in the Y-axis direction. 
     The metal layer  22  is stacked between the metal layer  21  and the metal layer  23 . An upper surface of the metal layer  21  is bonded to the metal layer  31 . A lower surface of the metal layer  22  is bonded to the metal layer  23 . The metal layer  22  has a through-hole  22 X penetrating through the metal layer  22  in the thickness direction, and a pair of pipe walls  22   w  provided on both sides of the through-hole  22 X in the Y-axis direction. The through-hole  22 X constitutes the flow path  13   r.    
     The metal layer  21  is stacked on the upper surface of the metal layer  22 . The metal layer  21  has pipe walls  21   w  provided at positions overlapping the pipe walls  22   w  in the top view, and an upper wall  2 l u  provided at a position overlapping the flow path  13   r  in the top view. A lower surface of the pipe wall  21   w  is bonded to an upper surface of the pipe wall  22   w . The upper wall  2 l u  is provided between the pair of pipe walls  21   w . A lower surface of the upper wall  21   u  is exposed to the flow path  13   r . In other words, the upper wall  21   u  constitutes the flow path  13   r.    
     The metal layer  23  is stacked on the lower surface of the metal layer  22 . The metal layer  23  has pipe walls  23   w  provided at positions overlapping the pipe walls  22   w  in the top view, and a lower wall  23   d  provided at a position overlapping the flow path  3   r  in the top view. An upper surface of the pipe wall  23   w  is bonded to a lower surface of the pipe wall  22   w . The lower wall  23   d  is provided between the pair of pipe walls  23   w . An upper surface of the lower wall  23   d  is exposed to the flow path  13   r . In other words, the lower wall  23   d  constitutes the flow path  13   r.    
     The flow path  13   r  is configured by the through-hole  22 X of the metal layer  22 . The flow path  13   r  is formed by a space surrounded by an inner wall surface of the through-hole  22 X, the lower surface of the upper wall  21   u , and the upper surface of the lower wall  23   d.    
     Each pipe wall  13   w  is configured by, for example, the pipe wall  21   w  of the metal layer  21 , the pipe wall  22   w  of the metal layer  22 , and the pipe wall  23   w  of the metal layer  23 . 
     As shown in  FIG.  1 A , the condenser  13  has a first facing surface  13 A facing the heat dissipation plate  30 . The first facing surface  13 A is configured by, for example, the upper surface of the metal layer  21  in the condenser  13 . Note that, in the present specification, ‘facing’ indicates that surfaces or members are located at positions facing each other, and includes not only a case where they are located at positions completely facing each other, but also a case where they are located at positions partially facing each other. Also, in the present specification, ‘facing’ includes both a case where a member different from two parts is interposed between the two parts and a case where no member is interposed between the two parts. 
     (Configuration of Vapor pipe  12 ) 
     Similar to the condenser  13  shown in  FIGS.  1 A,  1 B and  2   , the vapor pipe  12  shown in  FIG.  3    is formed by the three stacked metal layers  21  to  23  (refer to  FIGS.  1 A and  2   ). For example, in the vapor pipe  12 , the flow path  12   r  is formed by forming a through-hole penetrating through the metal layer  22 , which is an inner metal layer, in the thickness direction. 
     (Configuration of Liquid Pipe  14 ) 
       FIGS.  1 A and  2   , the liquid pipe  14  is formed by the three stacked metal layers  21  to  23 , similar to the condenser  13 . In the liquid pipe  14 , the flow path  14   r  is formed by forming a through-hole  22 Y penetrating through the metal layer  22 , which is an inner metal layer, in the thickness direction. The liquid pipe  14  has the pair of pipe walls  14   w  provided on both sides of the flow path  14   r . Each pipe wall  14   w  is not formed with a hole or a groove. The liquid pipe  14  may have a porous body, for example. The porous body is configured to have, for example, first bottomed holes concave from the upper surface of the metal layer  22 , which is an inner metal layer, second bottomed holes concave from the lower surface of the metal layer  22 , and pores formed by causing the first bottomed holes and the second bottomed holes to partially communicate with each other. The porous body is configured to guide the working fluid C condensed in the condenser  13  to the evaporator (refer to  FIG.  3   ) by a capillary force generated in the porous body  20 , for example. In addition, although not shown, the liquid pipe  14  is provided with an injection port for injecting the working fluid C (refer to  FIG.  3   ). However, the injection port is closed by a sealing member, so that an inside of the loop type heat pipe  10  is kept airtight. 
     (Configuration of Evaporator  11 ) 
     Similar to the condenser  13  shown in  FIGS.  1 A,  1 B and  2   , the evaporator  11  shown in  FIG.  3    is formed by the three stacked metal layers  21  to  23  (refer to  FIGS.  1 A and  2   ). The evaporator  11  may have a porous body, similar to the liquid pipe  14 , for example. For example, in the evaporator  11 , a porous body provided in the evaporator  11  is formed in a comb-teeth shape. In the evaporator  11 , a region in which the porous body is not provided has a space. 
     In this way, the loop type heat pipe  10  is configured by the three stacked metal layers  21  to  23  (refer to  FIG the. 2 A ). Note that, the number of the stacked metal layers is not limited to three layers, and may be four or more layers. 
     (Configuration of First Magnet  50 ) 
     The first magnet  50  is provided in the condenser  13  of the loop type heat pipe  10 . The condenser  13  is provided with, for example, a plurality of (six, in the present embodiment) first magnets  50 . Each of the first magnets  50  is embedded in the condenser  13 , for example. Each of the first magnets  50  is embedded in the pipe wall  13   w  of the condenser  13 , for example. In other words, each of the first magnets  50  is provided so as not to overlap the flow path  15 , specifically, the flow path  13   r , in the top view, for example. The first magnets  50  are provided, for example, on both sides of the pair of pipe walls  13   w.    
     As shown in  FIG.  1 B , each of the first magnets  50  is provided to penetrate through the pipe wall  13   w  of the condenser  13  in the thickness direction (here, Z-axis direction), for example. For example, the pipe wall  13   w  is provided with a plurality of through-holes  13 X penetrating through the pipe wall  13   w  in the thickness direction. Each of the first magnets  50  is accommodated in each through-hole  13 X, for example. A side surface of each of the first magnets  50  is in close contact with an inner surface of each through-hole  13 X, for example. The side surface of each of the first magnets  50  is in close contact with the inner surface of each through-hole  13 X over an entire circumference of the first magnet  50  in a circumferential direction, for example. Note that, the side surface of each of the first magnets  50  and the inner surface of each through-hole  13 X may be in direct contact with each other or may be in contact with each other via an adhesive member or the like. An upper surface of each of the first magnets  50  is exposed from, for example, the upper surface of the metal layer  21 , i.e., the first facing surface  13 A. The upper surface of each of the first magnets  50  is formed flush with the first facing surface  13 A, for example. A lower surface of each of the first magnets  50  is exposed from the lower surface of the metal layer  23 , for example. The lower surface of each of the first magnets  50  is formed flush with the lower surface of the metal layer  23 , for example. 
     A planar shape of each of the first magnets  50  can be formed to have arbitrary shape and size. As shown in  FIG.  3   , the planar shape of each of the first magnets  50  of the present embodiment is formed in a circular shape. The plurality of first magnets  50  are provided side by side along one direction (here, X-axis direction) of a plane direction orthogonal to the thickness direction (here, Z-axis direction) of the condenser  13 . The plurality of first magnets  50  are provided spaced apart from each other in the X-axis direction, for example. In the condenser  13  of the present embodiment, on each of both sides of the flow path  13   r  (specifically, flow path r 2 ) in the Y-axis direction, three first magnets  50  are provided spaced apart from each other in the X-axis direction. The first magnet  50  provided on one pipe wall  13   w  and the first magnet  50  provided on the other pipe wall  13   w  are provided to sandwich the flow path  13   r  from both sides in the Y-axis direction. For example, the first magnet  50  provided on one pipe wall  13   w  and the first magnet  50  provided on the other pipe wall  13   w  are provided at the same positions in the X-axis direction. Note that, the first magnet  50  provided on one pipe wall  13   w  and the first magnet  50  provided on the other pipe wall  13   w  may be provided at positions different from each other in the X-axis direction. 
     As the first magnet  50 , for example, a ferrite magnet, a neodymium magnet, or the like can be used. As the first magnet  50 , for example, it is preferably to use a magnet with relatively large demagnetization (reduction in magnetic force) due to heat, i.e., relatively large thermal demagnetization. The first magnet  50  of the present embodiment is a ferrite magnet with large thermal demagnetization. 
     (Configuration of Heat Dissipation Plate  30 ) 
     As shown in  FIG.  1 A , the heat dissipation plate  30  is provided facing the condenser  13  of the loop type heat pipe  10 . That is, the heat dissipation plate  30  is provided at a position overlapping the condenser  13 , in the top view. The heat dissipation plate  30  is provided thermally connectable to the first facing surface  13 A of the condenser  13 , for example. The heat dissipation plate  30  is formed in a flat plate shape, for example. The heat dissipation plate  30  has a rectangular shape in the top view, for example. The planar shape of the heat dissipation plate  30  is formed larger than the planar shape of the condenser  13 , for example. The heat dissipation plate  30  is also called a heat spreader. The heat dissipation plate  30  has, for example, a function of dispersing a density of heat from the condenser  13  when the heat dissipation plate is thermally connected to the first facing surface  13 A of the condenser  13 . 
     As a material of the heat dissipation plate  30 , a material having favorable thermal conductivity may be used, for example. As the heat dissipation plate  30 , a substrate made of copper (Cu), silver (Ag), aluminum (Al) or an alloy thereof can be used. As the heat dissipation plate  30 , for example, a substrate made of ceramics such as alumina or aluminum nitride, or an insulating material or semiconductor material having high thermal conductivity such as silicon may also be used. Note that, a thickness of the heat dissipation plate  30  may be set to about 500 μm to 1000 μm, for example. The thickness of the heat dissipation plate  30  is formed thicker than an overall thickness of the loop type heat pipe  10 , for example. 
     The heat dissipation plate  30  has a second facing surface  30 A (here, a lower surface) facing the first facing surface  13 A of the condenser  13 , and an opposite surface  30 B (here, an upper surface) provided on an opposite side to the second facing surface  30 A in the thickness direction (here, Z-axis direction) of the heat dissipation plate  30 . The second facing surface  30 A faces the first facing surface  13 A in the Z-axis direction. The second facing surface  30 A is thermally connectable to the first facing surface  13 A via, for example, the heat conductive member  70 . 
     (Configuration of Second Magnet  60 ) 
     The second magnets  60  is provided in the heat dissipation plate  30 . The heat dissipation plate  30  is provided with, for example, a plurality of second magnets  60 . The heat dissipation plate  30  is provided with the same number (here, six) of second magnets  60  as the first magnets  50 . Each of the second magnets  60  is embedded in the heat dissipation plate  30 , for example. Each of the second magnets  60  is provided to face each of the first magnets  50  in the Z-axis direction. A planar shape of each of the second magnets  60  can be formed to have arbitrary shape and size. The planar shape of each of the second magnets  60  is formed in a circular shape, for example, similar to the planar shape of the first magnet  50 . 
     Each of the second magnets  60  is provided to penetrate through the heat dissipation plate  30  in the thickness direction, for example. For example, the heat dissipation plate  30  is provided with a plurality of through-holes  30 X penetrating through the heat dissipation plate  30  in the thickness direction. Each of the second magnets  60  is accommodated in each through-hole  30 X, for example. A side surface of each of the second magnets  60  is in close contact with an inner surface of each through-hole  30 X, for example. The side surface of each of the second magnets  60  is in close contact with the inner surface of each through-hole  30 X over an entire circumference of the second magnet  60  in a circumferential direction, for example. A lower surface of each of the second magnets  60  is exposed, for example, from the second facing surface  30 A. The lower surface of each of the second magnets  60  is formed flush with the second facing surface  30 A, for example. An upper surface of each of the second magnets  60  is exposed from the opposite surface  30 B of the heat dissipation plate  30 , for example. The upper surface of each of the second magnets  60  is formed flush with the opposite surface  30 B, for example. 
     The first magnet  50  and the second magnet  60  are provided such that the same magnetic poles face each other, for example. For example, the first magnet  50  and the second magnet  60  are provided such that an N pole of the first magnet  50  and an N pole of the second magnet  60  face each other. In the present embodiment, the N pole is magnetized on an upper part of the first magnet  50  and the N pole is magnetized on a lower part of the second magnet  60 . For this reason, when the upper part of the first magnet  50  and the lower part of the second magnet  60  come close to each other, a magnetic repulsive force with which the first magnet  50  and the second magnet  60  try to move away from each other is generated between the first magnet  50  and the second magnet  60 . Note that, the first magnet  50  and the second magnet  60  may also be provided such that an S pole of the first magnet  50  and an S pole of the second magnet  60  face each other. 
     As the second magnet  60 , for example, a ferrite magnet, a neodymium magnet, or the like can be used. As the second magnet  60 , for example, a magnet having relatively large thermal demagnetization can be used. The second magnet  60  may be a magnet of the same type as the first magnet  50  or a magnet different from the first magnet  50 . The second magnet  60  of the present embodiment is a ferrite magnet having large thermal demagnetization. 
     (Configuration of Heat Conductive Member  70 ) 
     As a material of the heat conductive member  70 , for example, a heat conductive material (TIM: Thermal Interface Material) can be used. As the material of the heat conductive member  70 , for example, soft metal such as indium (In) or silver, silicone gel or an organic resin binder containing a metal filler, graphite, or the like can be used. 
     As shown in  FIG.  1 B , the heat conductive member  70  has a first end face  70 A facing the first facing surface  13 A of the condenser  13 , and a second end face  70 B facing the second facing surface  30 A of the heat dissipation plate  30 . The heat conductive member  70  is formed so that an adhesive force of the first end face  70 A and an adhesive force of the second end face  70 B are different from each other, for example. For example, any one of the first end face  70 A and the second end face  70 B is an adhesive surface, and the other of the first end face  70 A and the second end face  70 B is a non-adhesive surface. In the heat conductive member  70  of the present embodiment, while the first end face  70 A is formed as the non-adhesive surface, the second end face  70 B is formed as the adhesive surface. For this reason, the second end face  70 B of the heat conductive member  70  adheres to the second facing surface  30 A of the heat dissipation plate  30 . The first end face  70 A of the heat conductive member  70  does not adhere to the first facing surface  13 A of the condenser  13 . However, the first end face  70 A of the heat conductive member  70  can contact the first facing surface  13 A so as to be thermally connectable to the first facing surface  13 A of the condenser  13 . Note that, a thickness of the heat conductive member plate  70  may be set to about 20 μm to 100 μm, for example. 
     The heat conductive member  70  is provided, for example, on a part of the second facing surface  30 A. The heat conductive member  70  is provided so as not to overlap the first magnet  50  in the top view, for example. The heat conductive member  70  is provided so as not to overlap the second magnet  60  in the top view, for example. The heat conductive member  70  is provided to overlap the flow path  13   r  in the top view, for example. As shown in  FIG.  3   , the heat conductive member  70  is provided to extend in the X-axis direction along the flow path r 2  of the flow path  13   r , for example. The heat conductive member  70  is provided to be sandwiched between the first magnets  50  of two rows in the Y-axis direction, for example. 
     (Configuration of Support Member  40 ) 
     The electronic device M 1  shown in  FIGS.  1 A and  2    has the plurality of support members  40 , for example. The plurality of support members  40  are configured to support the heat dissipation plate  30  at a plurality of locations, for example, in the top view. In  FIGS.  1 A and  2   , only one support member  40  of the plurality of support members  40  is shown. Each of the support members  40  is connected to the housing  80 , for example. Each of the support members  40  is supported by the wall part  81  of the housing  80 , for example. The support member  40  is configured to support the heat dissipation plate  30  so as to be movable in the Z-axis direction. The support member  40  is configured to support the heat dissipation plate  30  so as to be movable in the Z-axis direction between a state in which the heat dissipation plate  30  is thermally connected to the condenser  13  (refer to  FIG.  1 A ) and a state in which the heat dissipation plate  30  is not thermally connected to the condenser  13  (refer to  FIG.  2   ). The support member  40  is configured to movably support the heat dissipation plate  30 , so as to be able to vary a distance between the first facing surface  13 A of the condenser  13  and the second facing surface  30 A of the heat dissipation plate  30  in response to a change in magnetic force of the first magnet  50 . The support member  40  is configured to support the heat dissipation plate  30  so as to be movable in the Z-axis direction, in response to a change in repulsive force between the first magnet  50  and the second magnet  60  due to thermal demagnetization, for example. The support member  40  is configured to support the heat dissipation plate  30  so as to be parallel to the wall part  81 , for example. The support member  40  is configured to support the heat dissipation plate  30  so as to be movable in the Z-axis direction while maintaining a posture in which the opposite surface  30 B of the heat dissipation plate  30  is parallel to a lower surface of the wall part  81 , for example. The support member  40  is configured to support the heat dissipation plate  30  so as to be parallel to the condenser  13 , for example. The support member  40  is configured to support the heat dissipation plate  30  so as to be movable in the Z-axis direction while maintaining a posture in which the second facing surface  30 A of the heat dissipation plate  30  is parallel to the first facing surface  13 A of the condenser  13 , for example. The support member  40  has, for example, a Sarrus link mechanism. 
     Each of the supporting members  40  has, for example, a first plate part  41 , a second plate part  42 , and a hinge part  43  configured to connect the first plate part  41  and the second plate part  42 . An upper end of the first plate part  41  is connected to the wall part  81  of the housing  80 . The upper end of the first plate part  41  is rotatably connected to the wall part  81 , for example. A lower end of the first plate part  41  is connected to the hinge part  43 . The lower end of the first plate part  41  is rotatably connected to the hinge part  43 , for example. An upper end of the second plate part  42  is connected to the hinge part  43 . The upper end of the second plate part  42  is rotatably connected to the hinge part  43 . A lower end of the second plate part  42  is connected to the opposite surface  30 B of the heat dissipation plate  30 . The lower end of the second plate part  42  is rotatably connected to the opposite surface  30 B, for example. The first plate part  41  is formed to have the same length as that of the second plate part  42 , for example. Each of the support members  40  is formed so as to be able to vary an angle of the hinge part  43 , i.e., an angle formed by the first plate part  41  and the second plate part  42 , in response to a magnitude of the repulsive force between the first magnet  50  and the second magnet  60 . For example, in response to the magnitude of the repulsive force between the first magnet  50  and the second magnet  60 , the first plate part  41  rotates with respect to the wall part  81  and the hinge part  43 , and the second plate part  42  rotates with respect to the heat dissipation plate  30  and the hinge part  43 , so that the angle of the hinge part  43  changes. When the angle of the hinge part  43  changes, the heat dissipation plate  30  supported horizontally with respect to the wall part  81  moves in parallel along the Z-axis direction. For example, when the angle of the hinge part  43  becomes small, the heat dissipation plate  30  moves in parallel along the Z-axis direction so that it comes close to the wall part  81 . For this reason, when the angle of the hinge part  43  becomes small, the heat dissipation plate  30  moves in parallel along the Z-axis direction so that it gets away from the condenser  13 . In addition, when the angle of the hinge part  43  becomes large, the heat dissipation plate  30  moves in parallel along the Z-axis direction so that it gets away from the wall part  81 . For this reason, when the angle of the hinge part  43  becomes large, the heat dissipation plate  30  moves in parallel along the Z-axis direction so that it comes close to the condenser  13 . By the above, the heat dissipation plate  30  moves in parallel along the Z-axis direction while the posture in which the second facing surface  30 A of the heat dissipation plate  30  is parallel to the first facing surface  13 A of the condenser  13  is maintained. As a result, in response to the magnitude of the repulsive force between the first magnet  50  and the second magnet  60 , the distance between the first facing surface  13 A and the second facing surface  30 A can vary. 
     (Operations of Electronic Device M 1 ) 
     Next, operations of the electronic device M 1  will be described. 
     First, referring to  FIG.  2   , the electronic device M 1  at a time of a low heat input in which a heat input amount from the heat-generating component  16  (refer to  FIG.  3   ) to the loop type heat pipe  10  is equal to or less than a first heat amount will be described. Here, the heat input amount (first heat amount) at the time of the low heat input is, for example, a heat amount within a range in which heat dissipation by the heat dissipation plate  30  is not required. For example, the heat input amount (first heat amount) at the time of the low heat input is a heat amount within a range in which the heat generated by the heat-generating component  16  (refer to  FIG.  3   ) does not exceed a heat tolerance of the heat-generating component  16  even in a state in which there is no heat dissipation by the heat dissipation plate  30 . 
     At the time of the low heat input, since the heat input amount to the condenser  13  becomes small, an ambient temperature of the first magnet  50  provided in the condenser  13  becomes relatively low. For this reason, the thermal demagnetization in the first magnet  50  does not occur, or the thermal demagnetization in the first magnet  50  is extremely small. As a result, a large repulsive force is generated between the first magnet  50  and the second magnet  60 . In response to the repulsive force between the first magnet  50  and the second magnet  60 , the support member  40  supports the heat dissipation plate  30  in a state of being apart from the condenser  13 . Specifically, when the repulsive force generated between the first magnet  50  and the second magnet  60  becomes large, the angle of the hinge part  43  of the support member  40  decreases and the heat dissipation plate  30  moves in parallel along the Z-axis direction so that it comes close to the wall part  81 . The heat dissipation plate  30  is supported by the support member  40  in a state in which the heat conductive member  70  adhering to the second facing surface  30 A is separated from the first facing surface  13 A of the condenser  13 , i.e., in a state in which the heat dissipation plate is not thermally connected to the condenser  13 . At this time, since the angle of the hinge part  43  is maintained small by the large repulsive force generated between the first magnet  50  and the second magnet  60 , the heat dissipation plate  30  is supported by the support member  40  in the state of being thermally disconnected from the condenser  13 . In other words, at the time of the low heat input, the support member  40  is formed to support the heat dissipation plate  30  in a state in which the heat dissipation plate is not thermally connected to the condenser  13 . In this way, when the heat dissipation plate  30  and the condenser  13  are in the thermally disconnected state, heat dissipation or cooling by the heat dissipation plate  30  is not performed. Thereby, at the time of the low heat input, it is possible to suppress the heat-generating component  16  and the like from being excessively cooled by the heat dissipation plate  30 . For this reason, at the time of the low heat input, the electronic device M 1  can be kept warm by using the heat in the loop type heat pipe  10  and the heat-generating component  16  (refer  FIG.  3   ). For example, in a case of using the electronic device M 1  in a space environment, it may be required to keep the electronic device M 1  warm in a situation in which sunlight is not irradiated. In such a case, according to the electronic device M 1  of the present embodiment, at the time of the low heat input, the electronic device M 1  can be kept warm by using the heat in the loop type heat pipe  10  and the heat-generating part  16  (refer  FIG.  3   ). 
     Next, with reference to  FIG.  1 A , the electronic device M 1  at a time of a high heat input in which a heat input amount from the heat-generating component  16  (refer to  FIG.  3   ) to the loop type heat pipe  10  is larger than the first heat amount will be described. Note that, the heat input amount at the time of the high heat input is, for example, a heat amount within a range in which heat dissipation by the heat dissipation plate  30  is required. For example, the heat input amount at the time of the high heat input is a heat amount in which the heat generated by the heat-generating component  16  (refer to  FIG.  3   ) exceeds the heat tolerance of the heat-generating component  16  in a state in which there is no heat dissipation by the heat dissipation plate  30 . 
     At the time of the high heat input, since the heat input amount to the condenser  13  becomes large, the ambient temperature of the first magnet  50  provided in the condenser  13  becomes high. Since the first magnet  50  is exposed to the high temperature, the thermal demagnetization (decrease in magnetic force) in the first magnet  50  becomes larger, as compared with the case of the low heat input. As a result, the repulsive force between the first magnet  50  and the second magnet  60  becomes smaller, as compared with the case of the low heat input. When the repulsive force between the first magnet  50  and the second magnet  60  is weakened in this way, the angle of the hinge part  43  of the support member  40  becomes larger, as compared with the angle at the time of the low heat input, and the heat dissipation plate  30  moves in parallel along the Z-axis direction so that it comes close to the condenser  13 . The heat dissipation plate  30  is supported by the support member  40  in a state in which the heat conductive member  70  adhering to the second facing surface  30 A is in contact with the first facing surface  13 A of the condenser  13 , i.e., in a state in which the heat dissipation plate is thermally connected to the condenser  13 . At this time, the first end face  70 A of the heat conductive member  70  is in contact with the first facing surface  13 A of the condenser  13  without a gap, but does not adhere to the first facing surface  13 A. In addition, when the repulsive force between the first magnet  50  and the second magnet  60  is small, the angle of the hinge part  43  is maintained large, so that the heat dissipation plate  30  is supported by the support member  40  in a state of being thermally connected to the condenser  13 . In other words, at the time of the high heat input, the support member  40  is formed to support the heat dissipation plate  30  in a state in which the heat dissipation plate is thermally connected to the condenser  13 . In this way, when the heat dissipation plate  30  and the condenser  13  are in a thermally connected state, a path for heat conduction from the condenser  13  to the heat dissipation plate  30  via the heat conductive member  70  is formed. Thereby, the heat in the condenser  13  can be efficiently dissipated by the heat dissipation plate  30  at the time of the high heat input. For this reason, at the time of the high heat input, it is possible to efficiently cool the heat-generating component  16  (refer  FIG.  3   ), and to favorably suppress the heat generated by the heat-generating component  16  from exceeding the heat tolerance of the heat-generating component  16 . 
     Next, the effects of the present embodiment are described. 
     (1) The condenser  13  is provided with the first magnet  50 , and the heat dissipation plate  30  is provided with the second magnet  60  facing the first magnet  50 . In addition, provided is the support member  40  configured to movably support the heat dissipation plate  30  between the state in which the heat dissipation plate  30  is thermally connected to the condenser  13  and the state in which the heat dissipation plate is not thermally connected to the condenser, so as to be able to vary the distance between the condenser  13  and the heat dissipation plate  30 , in response to the change in magnetic force of the first magnet  50 . According to this configuration, the connection state of the heat dissipation plate  30  to the condenser  13  can be varied, in response to the change in magnetic force of the first magnet  50 . Here, in the state in which the heat dissipation plate  30  is not thermally connected to the condenser  13 , the heat dissipation (cooling) of the heat-generating component  16  is performed only by the loop type heat pipe  10 . In contrast, when the heat dissipation plate  30  is thermally connected to the condenser  13 , the density of heat from the condenser  13  can be dispersed by the heat dissipation plate  30 . Thereby, the heat dissipation (cooling) of the heat-generating component  16  is performed by the loop type heat pipe  10  and the heat dissipation plate  30 . For this reason, as compared with the state in which the heat dissipation plate  30  is not thermally connected to the condenser  13 , the heat dissipation performance in the loop type heat pipe  10  and the heat dissipation plate  30  can be improved. Therefore, by varying the connection state of the heat dissipation plate  30  to the condenser  13  in response to the change in magnetic force of the first magnet  50 , the heat dissipation performance of the loop type heat pipe  10  can be varied. Here, when the first magnet  50  is exposed to a high temperature, for example, the magnetic force decreases. For this reason, the magnetic force of the first magnet  50  changes, according to the use situation and the use environment of the loop type heat pipe  10 . Therefore, by varying the connection state of the heat dissipation plate  30  to the condenser  13  in response to the change in magnetic force of the first magnet  50 , it is possible to vary the heat dissipation performance of the loop type heat pipe  10 , in response to the use situation and the use environment of the loop type heat pipe  10 . 
     (2) At the time of the low heat input, the heat dissipation plate  30  is supported in the state of being thermally disconnected from the condenser  13 , in response to the repulsive force between the first magnet  50  and the second magnet  60 . At the time of the high heat input, the heat dissipation plate  30  is supported in the state being thermally connected to the condenser  13 , in response to the thermal demagnetization of the first magnet  50 . Specifically, at the time of the high heat input, the heat dissipation plate  30  is supported in the state of being thermally connected to the condenser  13 , in response to the decrease in repulsive force between the first magnet  50  and the second magnet  60  due to the thermal demagnetization of the first magnet  50 . According to this configuration, the heat dissipation performance of the loop type heat pipe  10  can be varied, in response to changes in the use situation and the use environment such as the heat input amount from the heat-generating component  16 . For example, at the time of the low heat input, since sufficient heat dissipation performance can be obtained only with the loop type heat pipe  10 , the heat dissipation by the heat dissipation plate  30  is not performed. Thereby, at the time of the low heat input, it is possible to suppress the heat-generating component  16  and the like from being excessively cooled by the heat dissipation plate  30 . For this reason, at the time of the low heat input, the electronic device M 1  can be kept warm by using the heat in the loop type heat pipe  10  and the heat-generating component  16  (refer  FIG.  3   ). On the other hand, at the time of the high heat input, since sufficient heat dissipation performance cannot be obtained only with the loop type heat pipe  10 , the heat dissipation by the heat dissipation plate  30  is performed. Thereby, the heat in the condenser  13  can be efficiently dissipated by the heat dissipation plate  30  at the time of the high heat input. For this reason, at the time of the high heat input, the heat-generating component  16  can be efficiently cooled. 
     (3) The first magnet  50  is provided in the condenser  13  of the loop type heat pipe  10 . According to this configuration, the first magnet  50  can be provided in the condenser  13  having a large area for heat dissipation. For this reason, an installation area of the first magnet  50  can be easily and widely secured. Further, the first magnet  50  is provided in the condenser  13 , so that heat can be efficiently dissipated to the heat dissipation plate  30 . 
     (4) The heat conductive member  70  is interposed between the first facing surface  13 A of the condenser  13  and the second facing surface  30 A of the heat dissipation plate  30 . The heat conductive member  70  can reduce a contact thermal resistance between the first facing surface  13 A and the second facing surface  30 A, and can smoothly conduct heat from the condenser  13  to the heat dissipation plate  30 . For this reason, when the heat dissipation plate  30  is connected to the condenser  13  via the heat conductive member  70 , the heat in the condenser  13  can be efficiently heat-conducted to the heat dissipation plate  30  via the heat conductive member  70 . 
     (5) The first end face  70 A of the heat conductive member  70  is formed as the non-adhesive surface, and the second end face  70 B of the heat conductive member  70  is formed as the adhesive surface. According to this configuration, for example, the second end face  70 B of the heat conducting member  70  adheres to the second facing surface  30 A of the heat dissipation plate  30 , and the first end face  70 A of the heat conducting member  70  does not adhere to the first facing surface  13 A of the condenser  13 . In this way, since any one of the condenser  13  and the heat dissipation plate  30 , here, the condenser  13  and the heat conductive member  70  do not adhere to each other, the heat dissipation plate  30  can be favorably moved so that the heat dissipation plate  30  and the condenser  13  are not thermally connected to each other. 
     (6) The first magnet  50  is embedded in the condenser  13 . According to this configuration, it is possible to favorably suppress the increase in size of the loop type heat pipe  10  in the Z-axis direction due to the first magnet  50  provided. 
     (7) The first magnet  50  is formed to penetrate through the condenser  13  in the thickness direction. According to this configuration, the thickness of the first magnet  50  can be easily formed to be thick. 
     OTHER EMBODIMENTS 
     The above embodiment can be changed and implemented, as follows. The above embodiment and the following modified embodiments can be implemented in combination with each other within a technically consistent range. 
     In the above embodiment, the first magnet  50  is formed to penetrate through the condenser  13  in the thickness direction. However, the present invention is not limited thereto. 
     For example, as shown in  FIG.  5   , the first magnet  50  may be formed so as not to penetrate through the condenser  13  in the thickness direction. In this case, for example, the pipe wall  13   w  of the condenser  13  is provided with a plurality of concave portions  13 Y. Each concave portion  13 Y is formed so as not to penetrate through the condenser layer  13  in the thickness direction. Each concave portion  13 Y is formed to be concave from the first facing surface  13 A toward the lower surface of the condenser  13 , for example. Each concave portion  13 Y is formed to penetrate through the metal layers  21  and  22  among the metal layers  21 ,  22  and  23  in the thickness direction, for example. Each of the first magnets  50  is accommodated in each concave portion  13 Y. The side surface of each of the first magnets  50  is in close contact with an inner surface of each concave portion  13 Y, for example. Note that, the side surface of each of the first magnets  50  and the inner surface of each concave portion  13 Y may be in direct contact with each other or may be in contact with each other via an adhesive member or the like. 
     A depth of the concave portion  13 Y shown in  FIG.  5    can be changed as appropriate. For example, the concave portion  13 Y may be formed to penetrate through the metal layer  21  among the metal layers  21 ,  22  and  23  in the thickness direction. 
     The concave portion  13 Y shown in  FIG.  5    may be formed to be concave from the lower surface of the condenser  13 , i.e., the lower surface of the metal layer  23  toward the first facing surface  13 A. 
     In the above embodiment, the second magnet  60  is formed to penetrate through the heat dissipation plate  30  in the thickness direction. However, the present invention is not limited thereto. 
     For example, as shown in  FIG.  5   , the second magnet  60  may be formed so as not to penetrate through the heat dissipation plate  30  in the thickness direction. In this case, for example, the heat dissipation plate  30  is provided with a plurality of concave portions  30 Y. Each concave portion  30 Y is formed so as not to penetrate through the heat dissipation plate  30  in the thickness direction. Each concave portion  30 Y is formed to be concave from the second facing surface  30 A toward the opposite surface  30 B, for example. A bottom surface of each concave portion  30 Y is provided in the middle of the heat dissipation plate  30  in the thickness direction. Each of the second magnets  60  is accommodated in each concave portion  30 Y. The side surface of each of the second magnets  60  is in close contact with an inner surface of each concave portion  30 Y, for example. Note that, the side surface of each of the second magnets  60  and the inner surface of each concave portion  30 Y may be in direct contact with each other or may be in contact with each other via an adhesive member or the like. 
     A depth of the concave portion  30 Y shown in  FIG.  5    can be changed as appropriate. 
     The concave portion  30 Y shown in  FIG.  5    may be formed to be concave from the opposite surface  30 B toward the second facing surface  30 A. 
     In the above embodiment, the upper surface of the first magnet  50  is formed to be flush with the first facing surface  13 A. However, the present invention is not limited thereto. 
     For example, as shown in  FIG.  6   , the first magnet  50  may be formed to protrude toward the second facing surface  30 A from the first facing surface  13 A. In this case, the upper part of the first magnet  50  protrudes upward from the first facing surface  13 A. At this time, a protrusion amount of the first magnet  50  from the first facing surface  13 A is set to be smaller than the thickness of the heat conductive member  70 . Thereby, even when the first magnet  50  protrudes upward from the first facing surface  13 A, the condenser  13  and the heat dissipation plate  30  can be favorably thermally connected to each other via the heat conductive member  70 . 
     In the above embodiment, the lower surface of the second magnet  60  is formed to be flush with the second facing surface  30 A. However, the present invention is not limited thereto. 
     For example, as shown in  FIG.  6   , the second magnet  60  may be formed to protrude toward the first facing surface  13 A from the second facing surface  30 A. In this case, the lower part of the second magnet  60  protrudes downward from the second facing surface  30 A. At this time, a protrusion amount of the second magnet  60  from the second facing surface  30 A is set to be smaller than the thickness of the heat conductive member  70 . Further, in the modified embodiment shown in  FIG.  6   , a total amount obtained by summing the protrusion amount of the first magnet  50  from the first facing surface  13 A and the protrusion amount of the second magnet  60  from the second facing surface  30 A is set to be smaller than the thickness of the heat conductive member  70 . Thereby, even when the first magnet  50  protrudes from the first facing surface  13 A and the second magnet  60  protrudes from the second facing surface  30 A, the condenser  13  and the heat dissipation plate  30  can be favorably thermally connected to each other via the heat conductive member  70 . 
     In the above embodiment, the lower surface of the first magnet  50  is formed to be flush with the lower surface of the condenser  13 . However, the present invention is not limited thereto. For example, the lower part of the first magnet  50  may be formed to protrude downward from the lower surface of the condenser  13 . In addition, for example, the lower part of the first magnet  50  may be formed to be located closer to the first facing surface  13 A side than the lower surface of the condenser  13 . 
     In the above embodiment, the upper surface of the second magnet  60  is formed to be flush with the opposite surface  30 B of the heat dissipation plate  30 . However, the present invention is not limited thereto. For example, the upper part of the second magnet  60  may be formed to protrude upward from the opposite surface  30 B. In addition, for example, the upper part of the second magnet  60  may be formed to be located closer to the second opposite surface  30 A side than the opposite surface  30 B. 
     In the above embodiment, the first magnet  50  is provided embedded in the condenser  13 . However, the present invention is not limited thereto. For example, the first magnet  50  may be provided on an outer surface of the condenser  13 . 
     For example, as shown in  FIG.  7   , the first magnet  50  may be provided on the first facing surface  13 A of the condenser  13 . In this case, the thickness of the first magnet  50  is formed thinner than the thickness of the heat conductive member  70 . In addition, the first magnet  50  of the present modified embodiment is provided so as not to overlap the heat conductive member  70  in the top view. Thereby, even when the first magnet  50  is provided on the first facing surface  13 A, the condenser  13  and the heat dissipation plate  30  can be favorably thermally connected to each other via the heat conductive member  70 . 
     In the above embodiment, the second magnet  60  is provided embedded in the heat dissipation plate  30 . However, the present invention is not limited thereto. For example, the second magnet  60  may be provided on an outer surface of the heat dissipation plate  30 . 
     For example, as shown in  FIG.  7   , the second magnet  60  may be provided on the second facing surface  30 A of the heat dissipation plate  30 . In this case, the thickness of the second magnet  60  is formed thinner than the thickness of the heat conductive member  70 . In addition, the second magnet  60  of the present modified embodiment is provided so as not to overlap the heat conductive member  70  in the top view. Further, in the modified embodiment shown in  FIG.  7   , a total thickness obtained by summing the thickness of the first magnet  50  provided on the first facing surface  13 A and the thickness of the second magnet  60  provided on the second facing surface  30 A is formed to be smaller than the thickness of the heat conductive member  70 . Thereby, even when the first magnet  50  is provided on the first facing surface  13 A and the second magnet  60  is provided on the second facing surface  30 A, the condenser  13  and the heat dissipation plate  30  can be favorably thermally connected to each other via the heat conductive member  70 . 
     For example, as shown in  FIG.  8   , the first magnet  50  may be provided on a lower surface  13 B of the condenser  13 . In this case, the first magnet  50  may be provided to overlap the flow path  13   r  in the top view. In addition, the first magnet  50  may be provided to overlap the heat conductive member  70  in the top view. Further, the first magnet  50  may be provided to partially overlap the second magnet  60  in the top view. 
     In the above embodiment, the condenser  13  and the heat dissipation plate  30  are thermally connected to each other via the heat conductive member  70 . However, the present invention is not limited thereto. 
     For example, as shown in  FIG.  9   , the condenser  13  and the heat dissipation plate  30  may be thermally connected to each other by directly bringing the first facing surface  13 A of the condenser  13  and the second facing surface  30 A of the heat dissipation plate  30  into contact with each other. In this case, the heat conductive member  70  is omitted. 
     The planar shape of the first magnet  50  in the above embodiment is not particularly limited. For example, the planar shape of the first magnet  50  may be formed in an arbitrary shape such as a polygonal shape, a semicircular shape, or an elliptical shape. 
     The planar shape of the second magnet  60  in the above embodiment is not particularly limited. For example, the planar shape of the second magnet  60  may be formed in an arbitrary shape such as a polygonal shape, a semicircular shape, or an elliptical shape. 
     The shape of the flow path  13   r  in the condenser  13  of the above embodiment is not particularly limited. 
     For example, as shown in  FIG.  10   , the flow path  13   r  may be formed in a shape having a serpentine part r 4  meandering in an XY plane. The flow path  13   r  of the present modified embodiment has a flow path r 1  extending in the Y-axis direction, a serpentine part r 4  extending in the X-axis direction while meandering from an end portion of the flow path r 1 , and a flow path r 3  extending from an end portion of the serpentine part r 4  in the Y-axis direction. The first magnet  50  of the present modified embodiment is provided so as not to overlap the flow path  13   r , for example, in the top view. 
     In the above embodiment, the first magnets  50  are provided on both sides of the pair of pipe walls  13   w  of the condenser  13 . However, the present invention is not limited thereto. For example, the first magnet  50  may be provided only in one pipe wall  13   w  of the pair of pipe walls  13   w.    
     In the above embodiment, the plurality of first magnets  50  may be formed in different shapes from each other. 
     In the above embodiment, the plurality of second magnets  60  may be formed in different shapes from each other. 
     In the above embodiment, the first magnet  50  and the second magnet  60  may be formed in different shapes from each other. 
     In the above embodiment, the first magnet  50  is provided in the condenser  13  of the loop type heat pipe  10 , and the heat dissipation plate  30  is thermally connected to the condenser  13 . However, the present invention is not limited thereto. For example, the first magnet  50  may be provided in the liquid pipe  14  and the heat dissipation plate  30  may be thermally connected to the liquid pipe  14 . For example, the first magnet  50  may be provided in the vapor pipe  12 , and the heat dissipation plate  30  may be thermally connected to the vapor pipe  12 . 
     In the loop type heat pipe  10  of the above embodiment, the inner metal layer is configured only by the metal layer  22  of a single layer. That is, the inner metal layer is formed to have a single layer structure. However, the present invention is not limited thereto. For example, the inner metal layer may also be formed to have a stacked structure where a plurality of metal layers is stacked. In this case, the inner metal layer is configured by a plurality of metal layers stacked between the metal layer  21  and the metal layer  23 . 
     The structure of the support member  40  of the above embodiment can be appropriately changed. For example, the structure of the support member  40  is not particularly limited as long as the support member has a structure capable of movably supporting the heat dissipation plate  30  so that the distance between the outer surface of the loop type heat pipe  10  and the heat dissipation plate  30  can be varied, in response to the change in magnetic force of the first magnet  50 . For example, the support member  40  may be configured by a spring member.