Patent Publication Number: US-2023164408-A1

Title: Image capturing apparatus capable of efficiently discharging heat from heat generating devices and reduced in size

Description:
BACKGROUND 
     Technical Field 
     One disclosed aspect of the embodiments relates to an image capturing apparatus including circuit boards having heat generating devices mounted thereon, which is capable of efficiently discharging heat from the heat generating devices and is reduced in size. 
     Description of the Related Art 
     An image capturing apparatus contains heat generating devices, such as an image processing circuit and an image sensor, which generate heat when the image capturing apparatus is in operation. The heat generated by these heat generating devices may lower the performance of not only the heat generating devices themselves, but also other electrical devices, and may cause the temperature rise of the exterior of the image capturing apparatus, so that a user holding the image capturing apparatus may experience the exterior as hot to the touch. To prevent this, a mechanism is required for efficiently discharging heat generated in the image capturing apparatus to the outside of the image capturing apparatus. 
     As a method of discharging heat generated in the image capturing apparatus to the outside of the image capturing apparatus, a forced air-cooling method is used in which air is drawn from the outside of the image capturing apparatus by using a cooling fan, whereby heat generated in the image capturing apparatus is transferred to the drawn air to discharge the warmed air to the outside of the image capturing apparatus. For example, Japanese Laid-Open Patent Publication (Kokai) No. 2016-122718 has proposed an arrangement in which an L-shaped air- cooling duct is disposed to thereby discharge warmed air from an obliquely rearward location remote from a heat receiving portion of the air-cooling duct in an image capturing apparatus body. 
     One result of this arrangement of a portion of the cooling duct and cooling fans in the image capturing apparatus disclosed in Japanese Laid-Open Patent Publication (Kokai) No. 2016-122718 is a possible size increase of the image capturing apparatus body. 
     SUMMARY 
     One disclosed aspect of the embodiments provides an image capturing apparatus that realizes both the efficient dissipation of heat generated within an image capturing apparatus body to the outside of the image capturing apparatus and size reduction of the image capturing apparatus body. 
     In an aspect of the disclosure, there is provided an image capturing apparatus including an imaging board that has an image sensor mounted thereon, a main circuit board that has heat generating devices mounted thereon and is disposed substantially in parallel to an imaging surface of the image sensor, on a rear side of the imaging board, a duct unit that is disposed on a rear side of the main circuit board, and a cooling fan that draws outside air into the duct unit, wherein the duct unit comprises a duct base that is opposed to the main circuit board and is disposed substantially in parallel to the main circuit board, and a duct plate that is disposed obliquely to the duct base at a predetermined angle, wherein the cooling fan is mounted on the duct plate. 
     According to the disclosure, it is possible to realize both efficient dissipation of heat generated in the image capturing apparatus body to the outside of the image capturing apparatus and size reduction of the image capturing apparatus body. 
     Further features of the disclosure will become apparent from the following description of embodiments (with reference to the attached drawings). 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIGS.  1 A and  1 B  are appearance perspective views of an image capturing apparatus according to an embodiment. 
         FIG.  2    is an exploded perspective view of the image capturing apparatus. 
         FIG.  3    is a perspective view of components forming the appearance of a heat dissipation system of the image capturing apparatus. 
         FIGS.  4 A and  4 B  are exploded perspective views of the heat dissipation system of the image capturing apparatus. 
         FIG.  5 A  is a rear view of an image capturing apparatus body. 
         FIG.  5 B  is a schematic cross-sectional view of the heat dissipation system of the image capturing apparatus, taken along A-A in  FIG.  5 A . 
         FIG.  6    is a cross-sectional view showing the internal layout of the image capturing apparatus. 
         FIGS.  7 A and  7 B  are perspective views of a rear unit as a component of the image capturing apparatus. 
         FIG.  8    is perspective view of an imaging unit and a front unit of the image capturing apparatus in a disassembled state. 
         FIG.  9    is an exploded perspective view of the imaging unit. 
         FIG.  10    is a perspective view of the imaging unit and the front unit in an assembled state. 
         FIG.  11    is a cross-sectional view of a main unit, the imaging unit, and the front unit. 
         FIG.  12    is an exploded perspective view of the main unit. 
         FIGS.  13 A and  13 B  are a Z−X cross-sectional view (including an optical axis) and a partially enlarged view of the main unit, respectively. 
         FIG.  14    is a perspective view of a main circuit board, a power supply board, and a first heat-conductive sheet in an assembled state. 
         FIG.  15    is a schematic view useful in explaining an operation of inserting/removing a recording medium into/from the image capturing apparatus. 
         FIG.  16    is a perspective view showing a cross-section of the image capturing apparatus body. 
         FIG.  17    is a perspective view useful in explaining a shape and an attaching position of a second heat-conductive sheet. 
         FIG.  18    is an enlarged top view of a G portion in FIG. 16 . 
         FIGS.  19 A and  19 B  are a perspective view and a bottom view of the image capturing apparatus. 
         FIG.  20    is a bottom view of the image capturing apparatus in a state in which the image capturing apparatus is placed on a placing surface such that a right-side surface of the image capturing apparatus is brought into contact with the placing surface. 
         FIG.  21    is a side view of the image capturing apparatus. 
         FIGS.  22 A and  22 B  are cross-sectional views taken along J-J and K-K in  FIG.  21   , respectively. 
         FIGS.  23 A and  23 B  are side views of the image capturing apparatus body. 
         FIG.  24    is a right-side view of the image capturing apparatus body in a state in which a display panel is opened. 
         FIG.  25    is a view of the right-side surface and its vicinity, as viewed from a bottom side of the image capturing apparatus body. 
         FIG.  26    is an exploded perspective view of a top unit. 
         FIG.  27    is a top view of the image capturing apparatus. 
         FIGS.  28 A and  28 B  are cross-sectional views taken along V-V and W-W in  FIG.  27   , respectively. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     The disclosure will now be described in detail below with reference to the accompanying drawings showing embodiments thereof. 
       FIGS.  1 A and  1 B  are appearance perspective views of an image capturing apparatus  1  according to an embodiment. A direction of viewing the image capturing apparatus  1  is different between  FIGS.  1 A and  1 B . An orthogonal coordinate system formed by an X-axis, a Y-axis, and a Z-axis, which are perpendicular to one another, is defined as shown in  FIGS.  1 A and  1 B , for convenience of explanation. The Z-axis is parallel to an imaging optical axis (axis, hereinafter referred to as the “optical axis”, that passes the center of an image sensor  201  (see e.g.  FIG.  4 A ), described hereinafter and is perpendicular to an imaging surface  1003  (see e.g.  FIG.  8   ) of the image sensor  201 ) of the image capturing apparatus  1 . A Z direction in which the Z-axis extends is defined such that a direction toward an object to be imaged is a positive direction (+Z direction) and a direction opposite to the +Z direction is a negative direction (−Z direction). When the Z-axis is in a horizontal plane, the X-axis is in the same horizontal plane, and an X direction in which the X-axis extends is defined as a width direction of the image capturing apparatus  1 , a direction toward the right and a direction toward the left when the image capturing apparatus is viewed from an object side are defined as a positive direction (+X direction) and a negative direction (−X direction), respectively. In a state in which the X-axis and the Z-axis are in a horizontal plane, the Y-axis is parallel to a vertical direction, and a Y direction in which the Y-axis extends is defined as a height direction of the image capturing apparatus  1 . Further, the Y direction is defined such that a direction toward the sky is a positive direction (+Y direction) and a direction toward the ground (gravity direction) is a negative direction (−Y direction. 
     The image capturing apparatus  1  is roughly formed by an image capturing apparatus body  2  and a lens barrel  3 . Inside the image capturing apparatus body  2 , there are arranged a power supply section, not shown, a main circuit board  101  (see e.g.  FIG.  4 A ) that controls the overall operation of the image capturing apparatus  1 , the image sensor  201  that generates image signals by converting an optical image formed by incident light from the lens barrel  3  to electrical signals, an image processing circuit, not shown, that converts the image signals to image data, and so forth. Further, the image capturing apparatus body  2  has a space provided therein, for accommodating a storage medium for storing the image data. 
     The lens barrel  3  is attached to a front side (+Z side) of the image capturing apparatus body  2 . In the present embodiment, the lens barrel  3  is assumed to be a so-called interchangeable lens which can be attached and removed to and from the image capturing apparatus body  2 . However, this is not limitative, but the lens barrel  3  may be integrally formed with (unremovable from) the image capturing apparatus body  2 . 
     On a top surface (+Y side) of the image capturing apparatus body  2 , there are provided a power switch  11  for switching on/off the power supply and an accessory shoe  12  for enabling attachment/removal of each of a variety of accessories. On a right-side (+X side) surface of the image capturing apparatus body  2 , as viewed from the object side (+Z side), external terminal covers  13  for protecting connection terminals, not shown, such as a USB terminal and an HDMI (registered trademark) terminal, for connecting between the image capturing apparatus body  2  and external devices, not shown. Further, the right-side surface of the image capturing apparatus body  2  is provided with an air outlet port  14  for discharging air warmed by heat generated in the image capturing apparatus body  2  to the outside using a forced air-cooling mechanism, described hereinafter, using a cooling fan  102  (see e.g.  FIG.  3   ). 
     On a left-side (−X side) surface of the image capturing apparatus body  2 , as viewed from the object side, a medium cover  15  as a cover member for protecting a storage medium, not shown, accommodated in the image capturing apparatus body  2  is arranged. On a rear (−Z side) surface of the image capturing apparatus body  2 , there are provided a display panel  16  and an electronic viewfinder  17 . Further, the rear surface of the image capturing apparatus body  2  is provided with an air inlet port  18  for drawing outside air into the image capturing apparatus body  2  using the forced air-cooling mechanism, described hereinafter, using the cooling fan  102 . 
     On a bottom (−Y side) surface of the image capturing apparatus body  2 , there are provided a battery chamber cover  19  for protecting a battery chamber, not shown, for accommodating a battery, not shown, and a tripod screw  20  for attaching/removing a tripod, not shown,. 
       FIG.  2    is an exploded perspective view of the image capturing apparatus  1  in a state exploded into units as components of the image capturing apparatus body  2 . The image capturing apparatus body  2  is roughly formed by a main unit  100 , an imaging unit  200 , a shutter unit  300 , a front unit  400 , a top unit  500 , a rear unit  600 , a bottom unit  700 , and a side unit  800 . 
     The main unit  100  has a duct unit  120  and the cooling fan  102 , which form a closed space of the forced air-cooling mechanism, the main circuit board, and so forth. The imaging unit  200  has the image sensor  201  and an imaging board  202  (see e.g.  FIG.  3   ) on which the image sensor  201  is mounted. The shutter unit  300  has a shutter mechanism for adjusting exposure time. The front unit  400  has a mount portion on which the lens barrel  3  is removably mounted. The top unit  500  has a viewfinder unit including the electronic viewfinder  17 , and the power switch  11 . The rear unit  600  has the display panel  16  and the air inlet port  18 . The bottom unit  700  has a tripod portion including the tripod screw  20 . The side unit  800  has the external terminal covers  13  and the air outlet port  14 . 
     The image capturing apparatus body  2  is completed by assembling the shutter unit  300 , the imaging unit  200 , the main unit  100 , the top unit  500 , the rear unit  600 , the bottom unit  700 , and the side unit  800  to the front unit  400  in the mentioned order. 
       FIG.  3    is a perspective view of components of the appearance of a heat dissipation system of the image capturing apparatus  1 .  FIGS.  4 A and  4 B  are exploded perspective views of the heat dissipation system of the image capturing apparatus  1 , which are different in the direction of viewing the exploded heat dissipation system, as indicated by the coordinate axes illustrated therein. 
     The main unit  100 , the imaging unit  200 , and the front unit  400  each have a heat dissipation structure, and the whole heat dissipation system of the image capturing apparatus  1  is formed by the heat dissipation structures. The main unit  100  includes the main circuit board  101  and a power supply board  110  as heat generating sources. The heat dissipation structure of the main unit  100  has the cooling fan, denoted by reference numeral  102 , a first cooling fan cushion  103 , a duct base  104 , a duct plate  105 , and heat dissipation rubbers  106 . Further, the heat dissipation structure of the main unit  100  has a first heat-conductive sheet  107 , a second heat-conductive sheet  108 , a heat dissipation plate  109 , and a power supply board plate  111 . 
     The imaging unit  200  has the image sensor  201  and the imaging board  202  as the heat generating sources. The heat dissipation structure of the imaging unit  200  has an imaging board holder  203 , heat dissipation rubbers  204 , a third heat-conductive sheet  205 , and an imaging cooling member  206 . The heat dissipation structure of the front unit  400  has an imaging unit-holding member  401 . 
     Although details of each heat dissipation structure will be described hereinafter, here, the outline of the heat dissipation system of the image capturing apparatus  1  will be described. Heat generated in the main circuit board  101  and the imaging board  202  is transferred to the duct base  104  made of metal, such as aluminum, which is high in heat conductivity, via heat-conductive members, such as the heat dissipation rubbers  106 , and the first, second, and third heat-conductive sheets  107 ,  108 , and  205 . A duct unit  120  having a closed space is formed by the duct base  104  and the duct plate  105 , and outside air is taken into the duct unit  120  by the cooling fan  102 . Thus, air flowing through the duct unit  120  is warmed by heat exchange with the duct base  104 , and the warmed air is discharged to the outside, whereby heat dissipation from the inside of the image capturing apparatus body  2  to the outside is performed. Note that an air inlet portion  121  (see  FIG.  5 B ) of the duct unit  120  is connected to the air inlet port  18  (see  FIG.  1 B ), and an air outlet portion  122  (see  FIG.  5 B ) of the duct unit  120  is connected to the air outlet port  14  (see  FIG.  1 A ). 
     The main circuit board  101  is arranged on the heat dissipation plate  109  in a state held thereon such that the main circuit board  101  is perpendicular to the optical axis, not shown, of the image capturing apparatus  1 . As shown in  FIG.  4 A , on a +X side of the main circuit board  101 , an external connection terminal group  131  is mounted, and a second medium socket  133  is mounted on a +Z side surface of the main circuit board  101 . As shown in  FIG.  4 B , on a −X side of the main circuit board  101 , a first medium socket  132  is mounted on a −Z side surface of the main circuit board  101 . Note that in  FIG.  1 A , the external connection terminal group  131  is covered by the external terminal covers  13 , and in  FIG.  1 B , the first medium socket  132  and the second medium socket  133  are covered by the medium cover  15 , and hence these components do not appear in the external appearance. 
     The power supply board  110  that controls the power supply of the image capturing apparatus  1  is disposed at a location rearward (in a −Z direction) of the main circuit board  101  substantially in parallel to the main circuit board  101  such that the main circuit board  101  and the main circuit board  101  substantially overlap when viewed in the optical axis direction (as viewed from the +Z side toward the −Z side along the optical axis). The power supply board  110  is held on the power supply board plate  111  and is fixed to the heat dissipation plate  109  via the power supply board plate  111 . 
     The duct base  104  is disposed at a location rearward (on a −Z side) of the main circuit board  101  substantially in parallel to the main circuit board  101  such that the duct base  104  and the main circuit board  101  substantially overlap when viewed in the optical axis direction. The duct plate  105  is fixed to the duct base  104 , and the duct unit  120  having a closed space is formed by the duct plate  105  and the duct base  104 . 
     The cooling fan  102  is disposed on a rear side (−Z side) of the duct base  104  in a state sandwiching the first cooling fan cushion  103  between the cooling fan  102  and the duct plate  105 . By driving the cooling fan  102 , air flows into the closed internal space of the duct unit  120 . The cooling fan  102  is a so-called centrifugal fan and discharges air sucked from a planar direction to a centrifugal direction (side surface). 
     On the main circuit board  101 , there are mounted heat generating devices that consume large power and generate a large amount of heat, such as an MPU, a video engine (image processing circuit), and a volatile memory. Heat generated in the main circuit board  101  is transferred to the duct base  104  via the first heat-conductive sheet  107 . Heat generated in a first recording medium which can be attached to the first medium socket  132  of the main circuit board  101  is transferred to the duct unit  120  via the second heat-conductive sheet  108 . Heat generated in the image sensor  201  is transferred to the duct base  104  via the third heat-conductive sheet  205 . Details of these heat transfer paths will be described hereinafter. 
     When driving the cooling fan  102 , air (outside air) flows into the duct unit  120 , whereby heat exchange occurs between the duct base  104  whose temperature is rising and air flowing in the duct unit  120 , and the warmed air is discharged to the outside. Thus, the heat generated in the image capturing apparatus body  2  is dissipated to outside air, whereby it is possible to cool the image capturing apparatus body  2 , in other words, it is possible to suppress rise of the internal temperature. 
     Next, the heat dissipation structure of the main unit  100  will be described.  FIG.  5 A  is a rear view of the image capturing apparatus  1 , and  FIG.  5 B  is a schematic cross-sectional view of the heat dissipation system of the image capturing apparatus, taken along A-A in  FIG.  5 A , in which a flow of air in the heat dissipation system is illustrated. To clearly illustrate the heat dissipation structure of the main unit  100 ,  FIG.  5 B  shows only the main unit  100 , the rear unit  600 , and the side unit  800 . 
     By driving the cooling fan  102 , air sucked from the air inlet port  18  into the image capturing apparatus body  2  flows in a direction indicated by an arrow in  FIG.  5 B  and then flows into the internal space of the duct unit  120  formed by the duct base  104  and the duct plate  105 . The air flowing into the internal space of the duct unit  120  passes between a plurality of duct fins  104   a  formed on the duct base  104 , then passes through the inside of the cooling fan  102 , and is discharged in the centrifugal direction of the cooling fan  102  and discharged from the air outlet port  14 . 
     The cooling fan  102  has two surfaces opening in opposite planar directions. One of the opening surfaces of the cooling fan  102  is in contact with the duct plate  105  with the first cooling fan cushion  103  disposed therebetween and is opposed to an opening  105   a  of the duct plate  105 . The other of the opening surfaces of the cooling fan  102  is in contact with a rear plate  601  with a second cooling fan cushion  602  disposed therebetween. The rear plate  601  is not formed with an opening, and hence when the rear unit  600  is assembled to the main unit  100 , the other opening of the cooling fan  102  is closed. Therefore, as mentioned above, by driving the cooling fan  102 , air flows into the duct unit  120  only from the air inlet port  18 . 
       FIG.  6    is a cross-sectional view showing the internal layout of the image capturing apparatus  1  and corresponds to the cross-sectional view taken along A-A in  FIG.  5 A . Here, the description is given mainly of the structures of the cooling fan  102  and the duct base  104  of the main unit  100 . 
     The main circuit board  101  is arranged to be substantially perpendicular to the optical axis of the image capturing apparatus  1 . In other words, the main circuit board  101  is arranged such that the thickness direction of the main circuit board  101  is substantially parallel to the optical axis. The duct base  104  which provides a wall on the front side ((+Z side) toward the main circuit board  101 ) of the duct unit  120  is arranged to be perpendicular to the optical axis, in other words, substantially opposed to the main circuit board  101  in the optical axis direction. The duct plate  105  which provides a wall on the rear side (−Z side) of the duct unit  120  is arranged to be inclined at a predetermined angle with respect to the optical axis (such that an angle formed with the optical axis is larger than 0° and smaller than)90° as shown in  FIG.  6   . In other words, the duct plate  105  is arranged to be inclined at a predetermined angle also with respect to the duct base  104  (such that an angle formed with the duct base  104  is larger than 0° and smaller than)90°. 
     The cooling fan  102  is attached to the rear surface (surface on the −Z side) of the duct plate  105 , and therefore, the cooling fan  102  is attached obliquely to the optical axis. For this reason, in a Z−X plane, a space portion C having a substantially triangular cross-sectional shape is formed between the cooling fan  102  and a rear cover  603  disposed substantially in parallel to the main circuit board  101 , at a location rearward (on the −Z side) of the cooling fan  102 . In other words, the cooling fan  102  is obliquely disposed such that a space portion D having a substantially triangular cross-sectional shape encroaches on the duct unit  120  having a substantially rectangular cross-sectional shape. As is clear from comparison of  FIG.  6    with  FIG.  5 B , the space portion D is an area in the duct unit  120 , where air does not flow, and hence the heat dissipation efficiency (cooling efficiency) is not reduced. That is, by arranging the cooling fan  102  obliquely to the duct base  104 , the space of the space portion C is generated without degrading the heat dissipation performance (cooling performance). 
     Next, the heat dissipation structure of the rear unit  600  will be described.  FIGS.  7 A and  7 B  are perspective views of the rear unit  600 .  FIG.  7 A  shows a state in which the rear plate  601  has been attached, and  FIG.  7 B  shows a state in which the rear plate  601  has been removed. 
     The rear unit  600  has the display panel  16  (see  FIG.  1 B ). A panel connection wire  610  connected to the display panel  16  is connected to a connector  611   a  of a rear connection flexible board  611 , and the rear connection flexible board  611  is connected to the main circuit board  101  via a relay flexible board, not shown. With this, image signals generated by the main circuit board  101  are transmitted to the display panel  16 , whereby an image of the image signals is displayed on the display panel  16 . 
     The rear plate  601  has a surface substantially parallel to the rear cover  603  and a surface substantially parallel to the cooling fan  102 , which are formed continuous with each other, and the second cooling fan cushion  602  is attached to one of these two surfaces, which is substantially parallel to the cooling fan  102 . The panel connection wire  610  is received in a space formed by the rear cover  603  substantially perpendicular to the optical axis and the surface, substantially parallel to the cooling fan  102 , of the rear plate  601 . 
     Here, size reduction of the image capturing apparatus body  2 , realized by the layout of the main unit  100  and the rear unit  600 , will be described with reference to  FIG.  6   . As described above, the cooling fan  102  is mounted on the duct plate  105  arranged obliquely to the optical axis in the duct unit  120 . 
     Therefore, the space portion C having the substantially triangular cross-sectional shape is formed between the cooling fan  102  and the rear cover  603  when viewed in the Y-axis direction (as viewed from the top of the image capturing apparatus  1 ). Accordingly, by making effective use of the space portion C through accommodation of the panel connection wire  610  of the rear unit  600  in the space portion C, it is possible to realize size reduction of the image capturing apparatus body  2  (reduction of the thickness in the Z direction). 
     Next, a positional relationship between the cooling fan  102  and the duct fins  104   a  will be described. As shown in  FIGS.  4 B and  5 B , the plurality of duct fins  104   a  are arranged inside the duct unit  120  such that the duct fans  104   a  extend along a direction in which air flows. The duct fins  104   a  are arranged in a position where the duct fins  104   a  and the main heat sources of the main circuit board  101  overlap when viewed in the optical axis direction. Therefore, heat is transferred from the main heat sources near the duct fins  104   a  to the duct fins  104   a  via the first heat-conductive sheet  107 , and therefore, the duct fins  104   a  efficiently function as a heat sink. 
     Further, as shown in  FIG.  5 B , the cooling fan  102  and the duct fins  104   a  are arranged at respective locations where they do not overlap each other when viewed in the optical axis direction but partially overlap along the Z direction when viewed in the X-axis direction (as viewed in the width direction of the image capturing apparatus  1 ). This makes it possible to realize size reduction of the image capturing apparatus body  2  (reduction of the thickness in the Z direction). 
     Further, the duct fins  104   a  and the cooling fan  102  are designed such that the cross-sectional area of the duct fins  104   a  in the air flow direction and the cross-sectional area of the cooling fan  102  in the air flow direction are substantially the same. Thus, it is possible to arrange the duct fins  104   a  having a surface area required to function as the heat sink and ensure the air flow rate necessary for heat dissipation, whereby it is possible to realize the high heat dissipation performance. 
     Next, the heat dissipation structure of the imaging unit  200  will be described.  FIG.  8    is perspective view of the imaging unit  200  and the front unit  400  in a disassembled state.  FIG.  9    is an exploded perspective view of the imaging unit  200 .  FIG.  10    is a perspective view of the imaging unit  200  and the front unit  400  in an assembled state, mainly showing the structures of the top surface and the rear surface.  FIG.  11    is a Y−Z cross-sectional view (cross-sectional view taken along a plane perpendicular to the X-axis) of the main unit  100 , the imaging unit  200 , and the front unit  400 , showing a cross-section at a position including the optical axis of the image capturing apparatus  1 . 
     In the present embodiment, the image sensor  201  and the imaging board  202  are integrally formed by arranging the imaging board  202  on the rear side of the image sensor  201  in the optical axis direction and are electrically connected with each other. Incident light through the lens barrel  3  forms an image on an imaging surface  1003  of the image sensor  201 . 
     The imaging unit  200  and the front unit  400  are fixed between the imaging board holder  203  and the imaging unit-holding member  401  via washers  1001 . By changing the thickness of the washer  1001  or layering the plurality of washers  1001 , it is possible to adjust a distance from a lens mount surface  1002  to the imaging surface  1003  of the image sensor  201  (so-called flange back) in the optical axis direction. It is desirable that the imaging board holder  203  and the imaging unit-holding member  401  are fixed at three or more locations so as to make it possible to adjust the tilt of the imaging surface  1003  in the optical axis direction with respect to the lens mount surface  1002 . 
     The imaging board  202  and the imaging board holder  203  are bonded (fixed) with an adhesive. Image capturing section electrical connection members  1010  electrically connect between the imaging board  202  and the main circuit board  101 . The image capturing section electrical connection members  1010  are, specifically, flexible boards, and are provided at two respective locations in the X-axis direction as shown in  FIG.  10   . On a rear surface of a structure body formed by the image sensor  201 , the imaging board  202 , and the imaging board holder  203 , the heat dissipation rubbers  204  and the third heat-conductive sheet  205  are affixed. The third heat-conductive sheet  205  is e.g. a sheet material, such as a graphite sheet, which has high heat conductivity. 
     The third heat-conductive sheet  205  is affixed to the respective rear surfaces of the imaging board holder  203  and the heat dissipation rubbers  204  in a state extending thereacross. The third heat-conductive sheet  205  has a plurality of heat conductive portions  1020 . Front-side heat conductive portions  1021  of the plurality of heat conductive portions  1020  are connected to the imaging unit-holding member  401  formed of metal, such as aluminum, having a high heat conductivity. Therefore, heat generated in the image sensor  201  and the imaging board  202  is transferred to the imaging unit-holding member  401  having a high heat capacity via the front-side heat conductive portions  1021  of the third heat-conductive sheet  205 , and is diffused, whereby the temperature rise of the imaging unit  200  is suppressed. 
     Rear-side heat conductive portions  1022  of the plurality of heat conductive portions  1020  of the third heat-conductive sheet  205  are routed along the image capturing section electrical connection member  1010  and are thermally connected to the duct base  104 . Note that the two rear-side heat conductive portions  1022  are provided at upper and lower locations (on a +Y side and a −Y side), respectively. 
     An image sensor cushion member  1030  which is an elastic member is disposed between a reinforcing plate  1013  on which a main circuit board connector  1012  is mounted and the rear-side heat conductive portions  1022 . The image sensor cushion member  1030  is charged (compressed) when assembling the duct unit  120  to the main unit  100 , whereby the image sensor cushion member  1030  urges duct contact surfaces  1023  of the rear-side heat conductive portions  1022  toward the duct base  104 . This makes it possible to positively bring the duct contact surfaces  1023  into contact with the duct base  104  without generating variation in the contact state when the associated components are assembled, and perform heat dissipation with high efficiency. 
     One end of the image capturing section electrical connection member  1010  is connected to an imaging board connector  1011 . The other end of the image capturing section electrical connection member  1010  is routed from the imaging board connector  1011  toward the rear side of the main circuit board  101  in a state bent into an S-shape or U-shape and is connected to the main circuit board connector  1012  mounted on the reinforcing plate  1013 . As described above, since the image sensor cushion member  1030  is charged, it is possible to prevent the image capturing section electrical connection member  1010  from coming off the main circuit board connector  1012 . 
     The heat dissipation rubbers  204  are affixed to the rear surface of the imaging board  202  and sandwiched and held between the imaging board  202  and the third heat-conductive sheet  205 . Although in the present embodiment, the heat dissipation rubbers  204  are affixed at the two locations spaced in the Y direction, the number and the locations of the heat dissipation rubbers  204  are not limited to these, but for example, the heat dissipation rubbers  204  may be affixed at two respective locations spaced in the X direction. 
     The imaging cooling member  206  is affixed to the front surface of the imaging board holder  203 . The imaging cooling member  206  is arranged at a location where the imaging cooling member  206  is brought into contact with the imaging unit-holding member  401  when the imaging unit  200  is assembled to the front unit  400  and is sandwiched and held between the imaging board holder  203  and the imaging unit-holding member  401 . The imaging cooling member  206  is e.g. a member formed by winding a graphite sheet around a cushion member, a heat dissipation rubber having a high flexibility, or the like. 
     In the imaging unit  200  constructed as described above, heat generated in the image sensor  201  and the imaging board  202  is transferred to the third heat-conductive sheet  205  via the imaging board holder  203  and the heat dissipation rubbers  204 . Part of the heat transferred to the third heat-conductive sheet  205  is transferred to the imaging unit-holding member  401  via the front-side heat conductive portions  1021  and is diffused. Further, part of the heat transferred to the third heat-conductive sheet  205  is transferred to the duct base  104  via the rear-side heat conductive portions  1022  and is dissipated to the outside of the image capturing apparatus body  2  by the forced air-cooling mechanism using the cooling fan  102 . By forming the heat dissipation paths described above, it is possible to efficiently dissipate heat generated in the imaging unit  200  to the outside. 
     Next, the heat dissipation structure of the main circuit board  101  will be described.  FIG.  12    is an exploded perspective view of the main unit  100 .  FIG.  13 A  is a Z−X cross-sectional view (cross-sectional view perpendicular to the Y-axis) of the main unit 100 , which show a cross-section of the main unit  100  including the optical axis (not shown).  FIG.  13 B  is an enlarged view of an area E in  FIG.  13 A .  FIG.  14    is a perspective view of the main circuit board  101 , the power supply board  110 , and the first heat-conductive sheet  107  in an assembled state. 
     On the main circuit board  101 , there are mounted main heat source elements  1060  that consume large power consumption, such as a video engine and a volatile memory. Note that  FIG.  12    shows the plurality of main heat source elements  1060  in a state surrounded by an ellipse. The power supply board  110  and the duct unit  120  are arranged substantially in parallel with the image circuit board  101  and the power supply board  110  and the duct unit  120  overlap the main heat source elements  1060  when viewed in the optical axis direction. In the image capturing apparatus  1 , since the power supply board  110  is arranged between the duct base  104  and the main heat source elements  1060  in the optical axis direction, it is required to configure such that heat generated in the main circuit board  101  is transferred to the duct base  104  by avoiding the power supply board  110 . On the other hand, the power supply board  110  also has electronic components and electrical components mounted thereon, for controlling power supply for enabling the functions of the image capturing apparatus  1 , and hence the power consumption is large, which requires heat dissipation. 
     For this reason, heat transfer from the main heat source elements  1060  on the main circuit board  101  and the power supply substate  110  to the duct base  104  is performed using the first heat-conductive sheet  107 , a main heat source element cushion member  1050 , and a heat dissipation rubber  1040 , and the heat is dissipated from the duct base  104 . Details of this heat dissipation structure will be described below. 
     The main heat source element cushion member  1050  is affixed to the front side (+Z side) of the power supply board plate  111  that holds the power supply board  110 , and the first heat-conductive sheet  107  is affixed to the front side of the main heat source element cushion member  1050 . When the power supply board  110  is assembled to the main circuit board  101  in this state, the main heat source element cushion member  1050  is charged, and the first heat-conductive sheet  107  is brought into contact with the main heat source elements  160  on the main circuit board  101 . The heat dissipation rubber  1040  is affixed to the rear side (−Z side) of the power supply board  110 . Further, duct-side contact surfaces  1070  of the first heat-conductive sheet  107  are affixed to the rear side (−Z side) of the heat dissipation rubber  1040 . Here, it is desirable to use a member having proper elasticity for the heat dissipation rubber  1040 . With this, the heat dissipation rubber  1040  is charged when the duct unit  120  is assembled to the main unit  100 , whereby it is possible to positively bring the duct-side contact surfaces  1070  of the first heat-conductive sheet  107  into contact with the duct base  104 . 
     Note that the main heat source element cushion member  1050  has a heat insulation property. Therefore, it is possible to transfer heat generated in the main circuit board  101  to the duct base  104  via the first heat-conductive sheet  107  while suppressing transfer of heat generated in the main heat source elements  1060  to the power supply board  110  (power supply board plate  111 ). On the other hand, the heat dissipation rubber  1040  is a member having a heat conductivity. Therefore, it is possible to transfer heat generated in the power supply board  110  to the duct base  104  via the heat dissipation rubber  1040  and the duct-side contact surfaces  1070  of the first heat-conductive sheet  107 . The heat thus transferred to the duct base  104  is dissipated to the outside of the image capturing apparatus body  2  by the forced air-cooling mechanism using the cooling fan  102 . 
     Note that in the present embodiment, the duct-side contact surfaces  1070  are routed from the outside of two opposite sides (more specifically, right and left sides (±X sides)) of the power supply board  110  to the rear side (−Z side) of the heat dissipation rubber  1040 . However, this is not limitative, but the duct-side contact surface  1070  may be routed from the outside of only one side of the power supply board  110  or from the outside of upper and lower sides (±Y sides) which are the other two opposite sides. 
     However, to enhance the heat dissipation performance, it is desirable to route the duct-side contact surfaces  1070  from both sides of the power supply board  110  in the X direction as in the present embodiment (or in the Y direction). In this case, portions, the duct-side contact surfaces  1070  which each have a width d, as indicated in  FIG.  14   , and are drawn out from the ±X sides, are affixed to the heat dissipation rubber  1040  such that they do not overlap in the optical axis direction (Z direction). In the present example, although each duct-side contact surface  1070  is formed into a shape that is reduced in width from its root part affixed to the heat dissipation rubber  1040  toward its tip end, this is not limitative. This makes it possible to avoid generation of unevenness in contact between the duct-side contact surfaces  1070  and the duct base  104  and increase the amount of heat to be transferred from the main heat source elements  1060  to the duct base  104  via the first heat-conductive sheet  107  up to an approximately upper limit of the present configuration to thereby improve the heat dissipation performance. 
     Next, the heat dissipation structure for dissipating heat from a recording medium accommodated in the image capturing apparatus  1  will be described. In the image capturing apparatus  1 , a variety of data can be recorded and reproduced by using a card-shaped recording medium. There has been a demand for increasing the recording capacity and transfer speed of a recording medium, so that the power consumption of the recording medium is increased in accordance with an increase in the transfer speed, causing an increase in the amount of heat generation. Therefore, it is necessary to cool (dissipate heat from) the recording medium with a view to preventing degradation of the performance due to temperature rise. 
       FIG.  15    is a schematic view useful in explaining an operation of inserting/removing a recording medium  3001  into/from the image capturing apparatus  1 . In a general image capturing apparatus, it is assumed that a user holds (grips) the image capturing apparatus body by a right hand, and a holding part (grip) is provided on the −X side. Further, in view of the layout of the image sensor and the like, a recording medium-accommodating section into which a recording medium is inserted is often arranged in the holding part. Similar to this, in the image capturing apparatus  1 , a holding part  3002  is provided on the −X side of the image capturing apparatus body  2 , and the first medium socket  132  and the second medium socket  133 , which are the recording medium-accommodating section, are provided in the holding part  3002 . The medium cover  15  which can be opened/closed is provided on the recording medium-accommodating section, and the recording medium  3001  is inserted/removed in a state in which the medium cover  15  is opened. 
       FIG.  16    is a perspective view the image capturing apparatus body  2  shown in a cross-section taken along A-A in  FIG.  5 A , in which part rearward (on the −Z side) of the main circuit board  101  is mainly shown. The first medium socket  132  is disposed in a state displaced in the X direction with respect to the duct unit  120  and is mounted on the main circuit board  101 . This is because the holding part  3002  in which the recording medium-accommodating section is provided has restriction in thickness in the Z direction so as to maintain the ease of holding the holding part  3002 , and therefore, it is difficult to arrange the first medium socket  132  such that part of the duct unit  120  and the first medium socket  132  overlap each other when viewed in the optical axis direction. 
     In the present embodiment, the first medium socket  132  and the duct unit  120  are thermally connected by the second heat-conductive sheet  108  to allow heat generated in the recording medium  3001  to be released to the duct unit  120  via the first medium socket  132  and the second heat-conductive sheet  108 . 
       FIG.  17    is a perspective view useful in explaining a shape and an attaching position of the second heat-conductive sheet  108 . The second heat-conductive sheet  108  has a first connection portion  108   a  that connects to a surface of the first medium socket  132  and a second connection portion  108   b  that connects to an inner surface of the duct unit  120 , and is disposed in a state affixed to part H indicated by broken lines in  FIG.  17   . By connecting the second connection portion  108   b  to the inner surface of the duct unit  120 , the second connection portion  108   b  is brought into direct contact with air flowing in the duct unit  120 . With this, it is possible to efficiently discharge heat transferred from the recording medium  3001  to the second heat-conductive sheet  108 , to the outside. 
       FIG.  18    is an enlarged top view of a G portion in FIG. 16 . (as viewed from the +Y side). The second heat-conductive sheet  108  is thermally connected to a rear heat dissipation plate  3007  via a heat dissipation member  3004  having elasticity provided in an intermediate portion of a path from the first connection portion  108   a  to the second connection portion  108   b . The rear heat dissipation plate  3007  is a plate member made of metal (metal plate) that supports operation members, such as operation buttons  3008   a  and  3008   b , and an operation dial  3009 , which are arranged on a rear surface of the holding part  3002 . With this, heat generated in the recording medium  3001  is also transferred to the rear heat dissipation plate  3007  via the second heat-conductive sheet  108  and the heat dissipation member  3004  and is dissipated from the rear heat dissipation plate  3007  to the outside. 
     Further, the second heat-conductive sheet  108  is inserted from an opening formed in the duct unit  120  into the duct unit  120  (into the air flow passage), on the intermediate portion of the path from the first connection portion  108   a  to the second connection portion  108   b . In this opening (place where the second heat-conductive sheet  108  is inserted into the duct unit  120 ), a cushion member  3010  as an elastic member is disposed between the second heat-conductive sheet  108  and the duct unit  120 . The cushion member  3010  covers the opening in a compressed state and presses part of the second heat-conductive sheet  108  toward the duct base  104  of the duct unit  120 . This makes it possible to positively perform heat dissipation while keeping the sealability of the air flow passage in the duct unit  120 . 
     Note that although in the above description, the description is given of the form of applying the heat dissipation structure for dissipating heat from the recording medium to one medium socket (the first medium socket  132 ), the same heat dissipation structure may be applied to the second medium socket  133 . Further, the heat dissipation structure may be provided in both of the first medium socket  132  and the second medium socket  133 . The second heat-conductive sheet  108  may be connected not directly to the first medium socket  132 , but to a surface of the main circuit board  101  on which the first medium socket  132  is mounted, which surface is opposite from the surface on which the first medium socket  132  is mounted. Further, the board on which the medium socket is mounted is not limited to the main circuit board  101  but may be a dedicated board (medium board). 
     As shown in  FIG.  5 B , in the image capturing apparatus  1 , outside air is drawn from the air inlet port  18  by driving the cooling fan  102 , and after being caused to pass through the internal duct unit  120 , the air is discharged from the air outlet port  14 . At this time, to cause the duct unit  120  to exhibit the heat dissipation performance, it is necessary to ensure a sufficient amount of air passing through the duct unit  120 , and to do this, the air inlet port  18  and the air outlet port  14  are both required to each have a necessary and sufficient opening amount (opening area). 
     However, if the respective opening amounts of the air inlet port  18  and the air outlet port  14  are simply increased on one exterior surface, this makes it difficult to achieve size reduction of the image capturing apparatus  1 , which is the aim of the disclosure, and further, the appearance (beauty) may be impaired. To prevent this, the opening of the air inlet port  18  is formed in two surfaces in a state extending thereacross. With this, compared with a case where the same opening amount is secured on one surface, it is possible to secure the equivalent opening amount and further, reduce the opening amount visually recognized by a user when the user faces the opening surface to thereby increase the beauty of design. 
     More specifically, as shown in  FIG.  18   , the air inlet port  18  is provided in a first surface  3013  and a second surface  3014 , which are not parallel to each other. An intake air duct cover  3011  forming a flow passage of air drawn from the air inlet port  18  has a first space  3016  extending in a direction perpendicular to the first surface  3013  and a second space  3017  extending in a direction perpendicular to the second surface  3014 . The first space  3016  and the second space  3017  are formed such that they do not overlap each other when viewed in the Y-axis direction as shown in  FIG.  18   . With this, it is possible to make a structure which does not narrow the width of the air flow passage with respect to the opening amount while ensuring the opening amount of the air inlet port  18 . 
     Further, the intake air duct cover  3011  is formed such that it has a third space  3018  which is perpendicular to a third surface  3015  extending from the second surface  3014  and includes an area which does not overlap the second space  3017 . With this, the air flow passage formed by the intake air duct cover  3011  becomes a shape which narrows toward the inside of the image capturing apparatus  1 , and the second heat-conductive sheet  108  is connected to the duct unit  120  in the third space  3018 . 
     On the other hand, since the air flow passage narrows toward the inside, the range of the inside of the duct unit  120 , which can be visually recognized from the opening surface of the air inlet port  18 , becomes wide. The appearance treatment, such as coating, is not performed on the inner wall surface of the duct unit  120 , and hence if a wide range of the inside of the duct unit  120  can be visually recognized, the appearance quality of the image capturing apparatus  1  may be degraded. 
     To solve this problem, in the present embodiment, as indicated by arrows in  FIG.  16   , an air inlet port louver  3012  of the intake air duct cover  3011  is extended in a direction perpendicular to the opening surface of the air inlet port  18  to make it difficult to visually recognize the inside of the duct unit  120  from the opening surface. The direction of extending the air inlet port louver  3012  is parallel to the first space  3016 , the second space  3017 , and the third space  3018 . 
     Therefore, even when the air inlet port louver  3012  is extended, this does not interfere with the flow of air flowing into the duct unit  120 , and therefore, the heat dissipation performance is not lowered. Note that the above-described configuration of the opening of the air inlet port  18  formed in the two surfaces and configuration of the air inlet port louver  3012  can also be applied to the air outlet port  14 . 
     As for a relationship between the operation dial  3009 , arranged on the rear surface of the image capturing apparatus body  2  and the air inlet port  18 , if the operation dial  3009  is disposed in the vicinity of the opening surface of the air inlet port  18 , a finger operating the operation dial  3009  may cover the air inlet port  18 . To avoid this problem, the operation dial  3009  protrudes toward the −Z side more than the exterior surface, and a rotational axis  3009   a  of the operation dial  3009  is positioned to be substantially parallel to the first surface  3013  and closer to the second surface  3014  than the first surface  3013 . This makes it difficult for a finger operating the operation dial  3009  to cover the air inlet port  18 . 
     Next, the air outlet port  14  and the peripheral components will be described.  FIG.  19 A  is a perspective view of the image capturing apparatus  1 , in which the components on the right-side surface and the bottom surface (lower surface) are mainly shown.  FIG.  19 B  is a bottom view of the image capturing apparatus  1 .  FIG.  20    is a bottom view showing a state in which the image capturing apparatus  1  is placed on a placing surface, such as the top surface of a table, such that the right-side surface of the image capturing apparatus  1  is brought into contact with the placing surface. 
     The right-side cover of the image capturing apparatus body  2  has a first side surface  5000 , a second side surface  5001 , and a third side surface  5002 . The first side surface  5000  is substantially perpendicular to the X-axis, the second side surface  5001  is continuous with the first side surface  5000  and has an inclined portion which forms a predetermined angle with a surface perpendicular to the X-axis. The third side surface  5002  is continuous with the second side surface  5001  and is substantially parallel to the first side surface  5000 . 
     In the X direction, a distance hl from the optical axis to the first side surface  5000  is different from a distance h 2  from the optical axis to the third side surface  5002  (h 1 ≠h 2 ), and a relationship expressed by h 1 &lt;h 2  holds in the image capturing apparatus body  2 . The air outlet port  14  for discharging heat generated in the image capturing apparatus body  2  to the outside is formed in the second side surface  5001 . Therefore, as shown in  FIG.  20   , even in a state in which the image capturing apparatus  1  is placed such that the right-side surface of the image capturing apparatus  1  is brought into contact with the placing surface, the air outlet port  14  is prevented from being covered by the placing surface. Therefore, it is possible to positively dissipate heat generated in the image capturing apparatus  1  to the outside. 
       FIG.  21    is a side view of the image capturing apparatus  1 .  FIG.  22 A  is a cross-sectional view taken along J-J in  FIG.  21   , and  FIG.  22 B  is a cross-sectional view taken along K-K in  FIG.  21   . As shown in  FIG.  22 B , the cooling fan  102  is dispose close to the air outlet port  14 , which makes it possible to efficiently dissipate heat generated in the image capturing apparatus  1  to the outside using the cooling fan  102 . 
     Further, as shown in  FIGS.  21  and  22 A , the air outlet port  14  has a plurality of air outlet port louver portions  14   a  each having a slat shape. Each outlet port louver portion  14   a  is inclined obliquely downward from the inside of the image capturing apparatus  1  toward the outside, which makes it difficult to see the inside of the air outlet port  14 . That is, the cooling fan  102  disposed near the air outlet port  14  is hardly seen from the outside, and hence it is possible to prevent degradation of the appearance quality or improve the appearance quality. 
     Further, as shown in  FIG.  22 B , the second side surface  5001  in which the air outlet port  14  is formed is inclined with respect to a plane perpendicular to the X-axis. This makes it difficult to see the inside of the air outlet port  14  when viewing the air outlet port  14  from the right side (+X side) of the image capturing apparatus  1 , which also makes it possible to prevent degradation of the appearance quality or improve the appearance quality. Further, as shown in  FIG.  22 A , an air exhaust direction  5005  of the cooling fan  102  is substantially parallel to the inclination of the air outlet port louver portions  14   a . This makes it possible to smoothly discharge (reduce pressure loss) air flowing in the duct unit  120  from the air outlet port  14 , whereby it is possible to efficiently dissipate heat from the inside of the image capturing apparatus  1  to the outside air. Note that the structure of the opening of the air outlet port  14  is not limited to the opening for discharging air but can be applied to an opening for sucking air. 
     Next, the arrangement of the connection terminals in the image capturing apparatus  1  will be described.  FIG.  23 A  is a side view of the image capturing apparatus body  2 , showing a state in which the external terminal covers  13  for protecting the external connection terminal group  131  have been removed.  FIG.  23 B  is a side view of the image capturing apparatus  1 , showing a state in which the external terminal covers  13  have been attached. 
     The right-side surface of the image capturing apparatus body  2  is provided with the air outlet port  14 . Further, in the vicinity of the air outlet port  14 , connection terminals  7000   a  and  7000   b  are arranged as the external connection terminal group  131  which enables inputting and outputting of data, power supply, and so forth, to and from the image capturing apparatus  1 , by connecting connector cables and the like. 
     On the right-side surface of the image capturing apparatus body  2 , the five connection terminals  7000   a  are arranged on the front side (+Z side) of the air outlet port  14 , and another connection terminal  7000   b  is arranged on the upper side (+Y side) of the air outlet port  14 . When predetermined connector cables are inserted in the connection terminals  7000   a  and the connection terminal  7000   b , respectively, a cable housing portion of each connector cable protrudes from the +X side of the image capturing apparatus body  2 . 
     As a cover member for protecting the connection terminals  7000   a  and  7000   b  when the connection terminals  7000   a  and  7000   b  are not used, the external terminal covers  13  are provided. In a state covering the connection terminals  7000   a  and  7000   b , the external terminal covers  13  are held in a form extending along the right-side surface of the image capturing apparatus body  2 . When using a desired one of the connection terminals  7000   a  and  7000   b , a user is required to open an associated one of the external terminal covers  13 . The external terminal covers  13  are each arranged such that the user can move the external terminal cover  13  in a direction away from the image capturing apparatus body  2  by hooking e.g. a finger to its end portion and pushing up the end portion. 
     On the rear side of the image capturing apparatus body  2 , the display panel  16  is arranged such that it is rotatable in an opening/closing direction and rotatable in a tilting/reversing direction, via a two-axes variable angle hinge mechanism. That is, the display panel  16  is rotatable about an axis parallel to the Y-axis (first rotational axis) in the opening/closing direction between a closed position where the display panel  16  is positioned on the rear side of the image capturing apparatus body  2  and an opened position where the display panel  16  protrudes from the +X side of the image capturing apparatus body  2 . Further, the display panel  16  is rotatable about an axis perpendicular to the Y-axis (second rotational axis) in the tilting/reversing direction. 
       FIG.  24    is a right-side view of the image capturing apparatus body  2 , showing a state in which the display panel  16  is opened through approximately 180° in the opening/closing direction (state in which the display panel  16  protrudes toward the near side of the drawing sheet (opened state)). When the display panel  16  is rotated in the tilting/reversing direction in the opened state, the display panel  16  is rotatable within a range of a rotation track  7002 . Although the rotation track  7002  is close to the first side surface  5000  on which the connection terminals  7000   a  are arranged, the rotation track  7002  does not overlap the connection terminals  7000   a  and  7000   b  when viewed in the X-axis direction. Therefore, even in a state in which a cable is connected to any one of the connection terminals  7000   a  and  7000   b , the cable does not interfere with rotation of the display panel  16  in the tilting/reversing direction. 
     On the other hand, one of the external terminal covers  13  and the rotation track  7002  have an overlapping portion  7002   x  where they partially overlap each other when viewed in the X-axis direction. The influence of the overlapping portion  7002   x  on the operability of the external termina cover  13  will be described with reference to  FIG.  25   .  FIG.  25    is a view of the right-side surface and its vicinity, as viewed from the bottom side of the image capturing apparatus body  2 , showing a state in which the display panel  16  is opened through approximately 180° in the opening/closing direction and rotated through approximately 90° in the tilting/reversing direction. In this state, a display screen of the display panel  16  faces the +Y direction. 
     As described above, the side unit  800  is formed by the three surfaces (the first side surface  5000 , the second side surface  5001 , and the third side surface  5002 ). The external terminal covers  13  corresponding to the first side surface  5000  are at respective locations on the −X side with respect to the surface of the hinge of the display panel  16 , which corresponds to the third side surface  5002 , and hence a gap  7003  is formed between the display panel  16  and the external terminal covers  13 . Therefore, even when the overlapping portion  7002   x  exists where the display panel  16  partially overlaps the external terminal cover  13  when viewed in the X-axis direction, the user can easily open the external terminal cover  13  by inserting a finger in the gap  7003  and pulling up the external terminal cover  13 . 
     Next, the heat dissipation structure of the electronic viewfinder  17  will be described.  FIG.  26    is an exploded perspective view of the top unit  500 . The electronic viewfinder  17  is formed by a finder panel  7005  for displaying an image and an optical component  7004  for enlarging an image on the finder panel  7005 . The electronic viewfinder  17  is screwed and fixed to a finder cover  7007  for covering a top surface and side surfaces of the electronic viewfinder  17 . A flexible board  7006  connected to the finder panel  7005  is connected to the main circuit board  101  (not shown in  FIG.  26   ), whereby image signals are transmitted from the main circuit board  101  to the finder panel  7005 . When the electronic viewfinder  17  is used, heat is generated in the finder panel  7005 , and hence a heat dissipation structure for stably displaying an image on the finder panel  7005  is required. 
       FIG.  27    is a top view of the image capturing apparatus.  FIG.  28 A  is a cross-sectional view taken along V-V in  FIG.  27   , and  FIG.  28 B  is a cross-sectional view taken along W-W in  FIG.  27   . 
     The finder cover  7007  has a heat dissipation wall  7009 . The heat dissipation wall  7009  is arranged to be substantially parallel to a rear surface (surface on the +Z side) of the finder panel  7005 , i.e. substantially perpendicular to a top surface, in a state in which the finder cover  7007  has been attached. The finder cover  7007  is formed of metal, such as magnesium, which is high in heat conductivity, light, and high in rigidity. Further, on the rear surface (surface on the −Z side) of the finder panel  7005 , a heat dissipation rubber  7008  is affixed. A surface of the heat dissipation rubber  7008 , opposite from a surface which is in contact with the rear surface of the finder panel  7005 , is in contact with the heat dissipation wall  7009 . That is, the heat dissipation rubber  7008  is sandwiched and held between the heat dissipation wall  7009  and the finder panel  7005 . 
     Further, the accessory shoe  12  is disposed in the central portion of the finder cover  7007 . The periphery of the accessory shoe  12  is covered with a shoe cover  7011  different from the finder cover  7007 . The shoe cover  7011  is formed of a material which is low in heat conductivity, such as resin. 
     As shown in  FIG.  28 B , the shoe cover  7011  covers the root part (part on the +Y side) of the heat dissipation wall  7009 . Heat generated in the finder panel  7005  is transferred from the lower part (part on the −Y side) of the heat dissipation wall  7009  to the root part along arrows indicated on the heat dissipation wall  7009  in  FIG.  28 A . The heat transferred to the root part of the heat dissipation wall  7009  is transferred to the inside of the body along arrows indicated on the heat dissipation wall  7009  in  FIG.  28 B  and then discharged to the outside via the duct base  104  and the like. 
     As described above, by using the finder cover  7007  formed of metal having high heat conductivity as the heat-conductive member for transferring heat generated in the finder panel  7005 , the number of components is reduced, which makes it possible to realize cost reduction. Further, since the periphery of the root part of the finder cover  7007  is covered with the shoe cover  7011  made of resin having low heat conductivity, a user is prevented from directly touching the heat dissipation path, and the safety is ensured. Further, when a user uses the electronic viewfinder  17 , a user&#39;s eye  7012  looking into the electronic viewfinder  17  is at a location indicated in  FIG.  28 A . The user&#39;s eye  7012  is positioned at a location opposite from the heat dissipation wall  7009  across the electronic viewfinder  17  in the Z direction, and hence the user&#39;s eye  7012  is prevented from receiving thermal stimulation. 
     As described above, in the image capturing apparatus  1  according to the present embodiment, it is possible to efficiently dissipate heat generated in the image capturing apparatus body  2  to the outside, and what is more, it is possible to realize size reduction of the image capturing apparatus body  2 . 
     While the disclosure has been described with reference to embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions. 
     This application claims the benefit of priority from Japanese Patent Application No. 2021-190114 filed Nov. 24, 2021, which is hereby incorporated by reference herein in its entirety.