JP2006098506A - Imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus in which heat can be efficiently discharged from an electronic component via a battery in the inside of the casing. <P>SOLUTION: The imaging apparatus is provided with an imaging unit 3 for picking up an image of a subject from the one-surface side of the casing 2; a main substrate 25 on which an electronic apparatus 27 capable of generating heat when voltage is applied is mounted; and a display part 4 for displaying an image on the other surface of the casing 2; and a battery storage part 41 for storing a battery 23. The main substrate 25 and the battery storage part 41 are successively laminated, from the other surface side to the one-surface side in the order of the main substrate 25 and the battery storage part 41, the electronic component 27 is mounted on the battery storage part 41 side of the main substrate 25 and a heat discharging space 42 is formed on the one-surface side of the battery storage part 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an imaging apparatus such as a digital camera.

  The battery is exposed outside the device over a wide area, and the battery can be used as a heat dissipation part. An imaging device that radiates heat from an electronic component (heat generating component) that generates a relatively large amount of heat to a battery is known. In the imaging apparatus, a battery is attached to or detached from the outside of the housing, or a battery housing portion forms a part of the housing, and the battery or the battery housing portion is provided outside the housing. It can be broadly divided into those provided inside.

  As an imaging device in which a battery or a battery storage unit is attached to the outside of the housing, for example, a circuit board, a heat sink, a battery mounting surface of the housing, and a battery are stacked (Patent Document 2). There is one in which a camera unit, a deck unit, and a battery are arranged in a direction orthogonal to the optical axis (Patent Document 3).

As an imaging device in which the battery storage unit is provided inside the housing, for example, the substrate on which the heat generation source is provided and the battery storage unit are arranged in parallel in the direction along the surface of the substrate, and the battery is stored from the vicinity of the heat generation source. A heat dissipating member is disposed over the part (Patent Document 1), a battery housing part is disposed so as to be in close contact with the inside of the housing, and a battery is disposed between the circuit board and the tape loading mechanism (Patent Document) 4).
JP-A-9-163197 JP-A-8-23467 JP 7-143428 A Japanese Patent Laid-Open No. 9-18759

  In an imaging apparatus, there are cases where it is desired to arrange a battery on the inner side of the apparatus from various viewpoints such as downsizing of the apparatus and board layout. On the other hand, in the technique in which the battery or the battery storage unit is provided outside the housing, heat is radiated to the battery on the assumption that heat is radiated directly from the battery or the battery storage unit to the outside of the apparatus. In addition, in the prior literature in which the battery storage unit is provided inside the apparatus, the heat dissipation of the battery and the prevention of overheating are not disclosed.

  An object of the present invention is to provide an imaging apparatus that efficiently dissipates heat from an electronic component through a battery inside a housing.

  An image pickup apparatus according to the present invention includes an image pickup unit that picks up an image of a subject from one side of a housing, a display unit that displays an image on the other surface of the housing, and a circuit board provided with electronic components that generate heat. A battery storage section capable of storing a battery, wherein the circuit board and the battery storage section are stacked in the order of the circuit board and the battery storage section from the other surface side to the one surface side. The electronic component is provided on the battery housing part side of the circuit board, and a heat radiation space is formed on the one surface side of the battery housing part.

  Preferably, the circuit board and the battery storage unit provided in a stacked manner are disposed adjacent to the imaging unit in the stacking direction.

  Preferably, a hole is provided on the one surface side of the battery storage portion, and the heat dissipation space is formed including the hole.

  Preferably, the hole is formed in a shape capable of supporting at least a part of the battery by at least one end surface of the hole.

  Preferably, the apparatus further includes a heat transfer member provided between the electronic component and the battery storage unit or the battery, and the heat transfer member contacts the electronic component and contacts the battery storage unit or the battery. It is possible to contact.

  According to the imaging apparatus of the present invention, it is possible to efficiently dissipate heat from an electronic component via a battery inside the housing.

  1A and 1B are schematic perspective views of a digital camera 1 to which the present invention is applied. The digital camera 1 includes a horizontally long and thin rectangular parallelepiped casing 2, an imaging unit 3 for imaging a subject from the front side of the casing 2, a display unit 4 for displaying an image on the back of the casing 2, a casing A battery insertion portion 5 for inserting or removing a battery (battery) from the right side surface of the body 2 is provided. The display unit 4 is configured by a liquid crystal display (LCD), for example. The battery insertion portion 5 is configured to be able to open and close the lid 5a. The digital camera 1 also includes various operation units such as a release button 6 provided on the cover 7 on the upper surface side.

  2 and 3 are exploded perspective views of the digital camera 1 viewed from the front side and the back side, respectively, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. However, some elements such as the cover 7 on the upper surface side where the release button 6 is provided and the imaging unit 3 are omitted. The digital camera 1 includes a front cover (exterior cover) 21, a front side base 22, a battery 23, a back side base 24, a main board 25, and a back cover 26 (exterior cover) stacked from the front side to the back side. Yes. Note that a front side substrate 71 provided with a memory card slot and the like is also provided between the front side base 22 and the front cover 21 (see FIG. 7).

  The front side base 22 and the back side base 24 are made of, for example, resin. The front-side base 22 is formed to have substantially the same size as the housing 2, and an opening 22 a for arranging the imaging unit 3 is disposed on the battery non-insertion portion side, and a battery 23 is accommodated on the battery insertion portion side. The recess 22b is formed. The back-side base 24 is formed to be approximately half as wide as the housing 2, and is provided with a recess 24 b for storing the battery 23. When the front-side base 22 and the back-side base 24 are overlapped, the battery housing portion 41 is formed by the recess 22b and the recess 24b (see FIG. 5). The front-side base 22 and the back-side base 24 are positioned by fitting protrusions, holes, etc. provided on the front-side base 22 and the back-side base 24, and are fixed by screws.

  A hole 22c is formed in the recess 22b leaving an edge. Therefore, the battery 23 is frame-supported by the edge of the recess 22b. On the front side of the battery 23 or the battery storage part 41, a heat radiation space 42 in which no member is arranged is formed including the hole 22c (see FIG. 4). The battery 23 need not be frame-supported over the entire circumference of the battery 23 as long as at least a part of the battery 23 can be supported by one end surface of the hole 22c. For example, you may support only by the upper edge part and lower edge part of the hole 22c.

  The main substrate 25 is configured as, for example, a multilayer printed board in which a pattern layer, an insulating layer, a ground layer, and a power supply layer are stacked. Although the main board 25 extends over the left and right sides of the housing 2, most of the battery non-insertion portion side is notched to be empty in order to place the imaging unit 3. Various electronic components 27 such as an IC for driving and controlling the display unit 4 are mainly arranged on both surfaces of the main substrate 25. However, the electronic component 27 having a relatively large amount of heat generation is disposed on the battery insertion portion side on the front side, and the electronic component 27 having a relatively small amount of heat generation is disposed on the back side. Examples of electronic components that generate a relatively large amount of heat include AFE (Analog Front End) and DSP (Digital Signal Processor). The main substrate 25 is supported by a plurality of protrusions 24c provided on the back side base 24, and a concave portion 24d is provided on the back side of the back side base 24 corresponding to each electronic component 27. A clearance is provided between 27 and the back side base 24. The main board 25 is fixed to the back side base 24 and the front side base 22 by screws, for example.

  FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 1A, and conceptually shows the configuration and arrangement of the imaging unit 3. The left side of the figure is the front side of the digital camera 1. The imaging unit 3 and the control unit 61 including the battery storage unit 41 and the main board 25 are arranged in parallel in the left-right direction of the digital camera 1. The imaging unit 3 includes, for example, a plurality of lenses 62, a shutter 63, and an imaging element 64 such as a CCD.

  FIG. 7 is an exploded perspective view showing a connection state of the front cover 21, the front side substrate 71, the main substrate 25, and the back cover 26. The front cover 21 is formed of, for example, metal, and includes a front surface portion 21a that configures the front surface of the housing 2, and a lower surface portion 21b that extends from the front surface portion 21a in the stacking direction of the main substrate 25 and the like and configures the lower surface of the housing 2. It has. An opening window 21c for arranging the imaging unit 3 is provided on the left side of the front surface portion 21a, and a hole portion 21d for screwing the front cover 21 to the front surface base 22 is provided on the lower surface portion 21b. The back cover 26 is made of, for example, metal, and includes a back surface portion 26 a that forms the back surface of the housing 2, and a bottom surface portion that extends from the back surface portion 26 a in the stacking direction of the main substrate 25 and the like and forms the bottom surface of the housing 2. 26b. An opening window 26c for disposing the display unit 4 is provided in the back surface part 26a, and a hole part 26d for screwing the back cover 26 to the front side base 22 is provided in the bottom surface part 26b. The front substrate 71 is configured as a multilayer printed circuit board in the same manner as the main substrate 21. On the lower side of the covers 21 and 26 and the substrates 25 and 71, a mid-bridge 72 (connecting member) extending in a direction substantially orthogonal to the elements is provided in order to electrically connect the elements.

  FIG. 8 is a perspective view of the midbridge 72. In the description of FIGS. 8 to 10, when there is no need to particularly distinguish the front cover 21 and the back cover 26 and when there is no need to particularly distinguish the front side substrate 71 and the main substrate 25, Only the reference numeral is shown in parentheses for the other. The mid bridge 72 is formed of, for example, a single sheet metal, and includes a main body portion 73 and an end portion 74. A hole 75 is provided at both ends of the main body 73, and a notch 78 is provided at the center. An annular wall 79 extends upward from the edge of the hole 75. Further, both end sides of the main body 73 are formed wider than the center side. The end portion 74 includes a buffer portion 77 formed by bending a part thereof to the lower surface, and an insertion portion 76 that is formed by the remaining portion and narrower than both end sides of the main body portion 73. The insertion portion 76 is formed by bending upward so as to be positioned above the main body portion 73 and then bending again to the main substrate 25 (71) side.

  FIG. 9 is a cross-sectional view showing a state where the mid bridge 72 is attached to the front side base body 22 and the like. Note that this corresponds to a cross-sectional view taken along line IX-IX in FIG. An opening 91 that penetrates in the front-rear direction (left-right direction in the drawing) and a protrusion 93 that protrudes from the lower surface 92 of the front-side base 22 into the opening 91 are provided below the front-side base 22. (See also FIG. 12). The mid bridge 72 is positioned with respect to the front base 22 by inserting the mid bridge 72 into the opening 91 and fitting the notch 78 into the protrusion 93.

  A notch 81 is provided below the main board 25 (71) (see FIG. 8), and an insertion part 76 is inserted into a space formed by the notch, so that the midbridge 72 and the main board 25 (71 ) Ground layer 82 is electrically connected. The main board 25 (71) and the mid bridge 72 are fixed by soldering.

  FIG. 10A is a top view showing the vicinity of the hole 21d (26d) of the front cover 21 (26), and FIG. 10B is a state where the mid bridge 72 is further placed from the state of FIG. FIG. An annular contact portion 101 protruding upward at the edge of the hole 21d (26d) of the front cover 21 (26) contacts the lower surface side of the lower surface portion 92 (see also FIG. 9). The lower surface portion 92 is cut out so as to form an arch-shaped space 95 that substantially coincides with the hole 21d (26d) and a rectangular space 96 that is wider than the arch-shaped space. (See also FIG. 12). When the mid bridge 72 is positioned and placed thereon as described above, the buffer portion 77 is fitted into the space 96 as shown in FIG. Then, as shown in FIG. 9, the metal screw 102 penetrates the hole 21 d (26 d) of the front cover 21 (26) and the space 95 of the front base 22 from below, and the hole 75 of the mid bridge 72. The front cover 21 (26), the front side base body 22, and the mid bridge 72 are fixed. The hole 75 (wall portion 79) functions as a female screw portion. The mid bridge 72 can be automatically mounted on the main board 25 and the back side board 71 by a mounting machine.

  11 and 12 are perspective views showing the conductive member 111 for connecting the battery 23 and the main board 25 in a state of being attached to the main board 25 and a state before being attached. The conductive member 111 is made of, for example, metal, and includes a first terminal 112 connected to the battery 23 and a second terminal 113 connected to the main board 25. The conductive member 111 is bent at a substantially right angle at the connection portion between the first terminal 112 and the second terminal 113 and is formed in an L shape.

  The second terminal 113 has a screw hole 114 and a soldering portion 115 projecting from the edge opposite to the first terminal 112 as a fastening portion for fixing the conductive member 111 to the main board 25. Yes. Further, the second terminal 113 is provided along the positioning hole portions 116 disposed on both sides of the screw hole 114 and the edge portion extending to the first terminal side, and extends vertically with respect to the main substrate 25. 117.

  The main board 25 includes a connection portion 121 for connecting to the second terminal 113 at the left edge. The connecting portion 121 includes a metal foil 122 provided on the back side of the main substrate 25 over a slightly larger area than the second terminal 113, a screw hole 123 provided so as to penetrate the metal foil 122, and a screw hole 123 And positioning holes 124 disposed on both sides. On the left side of the upper connection portion 121, a notch 125 having a width comparable to that of the connection portion of the first terminal 112 and the second terminal 113 is provided, and on the left end portion of the lower connection portion 121, the first terminal is provided. A hole 126 having a width comparable to that of the connecting portion of 112 and the second terminal 113 is provided.

  The back-side base 24 includes a support portion 131 that protrudes toward the back side and supports the main substrate 25. The support part 131 has a screw hole 132 and positioning protrusions 133 provided on both sides of the screw hole 132. The height of the protrusion 133 is set larger than the thickness of the main board 25. In addition, the back-side base 24 includes a hole portion 134 into which the first terminal 112 can be inserted on the left side of the support portion 131. The hole 134 passes through the left end of the space in which the battery 23 is accommodated (the deepest portion when viewed from the battery insertion portion 5).

  The main board 25 is positioned by fitting the hole 124 to the protrusion 133. The conductive member 111 is positioned by fitting the hole 116 to the protrusion 133 protruding on the main board 25 through the hole 124 and inserting the first terminal 112 into the notch 125 or the hole 126. The At this time, the first terminal 112 is inserted substantially perpendicular to the main board 25 and disposed on the front side of the main board 25, and the second terminal 113 is placed along the back side of the main board 25. In other words, the second terminal 113 is disposed on the side opposite to the first terminal 111 with respect to the main board 25. The first terminal 112 is inserted into the hole 134 and is located at the innermost part of the battery storage unit 41 when viewed from the battery insertion unit 5. Then, the back side base 25, the main substrate 25, and the conductive member 111 are fixed to each other by passing the screw 135 through the screw holes 114 and 123 and screwing them into the screw holes 132. Further, the conductive member 111 is further fixed to the main board 25 by soldering the soldering portion 115 to the metal foil 122. After the assembly, the battery 23 is connected to the first terminal 112 by being inserted from the battery insertion portion 5 with the terminal side facing the innermost portion. The screw 135 is made of metal, for example, and has conductivity.

  FIG. 13 shows a state in which the main board 25 is removed from the back base 24 after the above-described assembly is performed once. Since the conductive member 111 is soldered to the main substrate 25 at the soldering portion 115, the conductive member 111 is removed from the back-side base 24 integrally with the main substrate 25.

  According to the above embodiment, the main board 25 and the battery storage unit 41 are arranged in a stacked manner, and the electronic component 27 having a relatively large amount of heat generation is provided on the battery storage unit 41 side. Heat dissipation to the battery 23 is efficiently performed. Further, since heat is radiated to the battery 23 and the battery storage unit 41 provided in the housing 2, discomfort felt by the user due to heat radiation from the housing 2 is alleviated. And since the heat dissipation space 42 is provided on the opposite side to the main board 25 of the battery storage part 41, overheating of the battery is prevented by heat dissipation from the battery 23 or the battery storage part 41 to the heat dissipation space. The apparatus main body is heated uniformly without being overheated locally. In particular, since a through hole is provided over a relatively wide range of the front side base 22 (for example, approximately half of the area of the battery to substantially the entire surface) to form a heat dissipation space, heat is radiated from the battery efficiently and uniformly.

  The present invention is not limited to the above-described embodiment, and may be implemented in various aspects.

  The electronic component and the battery or the battery storage portion may be in contact with each other or provided with a clearance as long as the circuit board on which the electronic component is provided and the battery storage portion are arranged in a stacked manner. Good. In the case of contact with each other, the electronic component and the battery or the battery housing may be directly contacted, or indirectly through a member having a relatively high thermal conductivity, for example, higher thermal conductivity than air. You may make it contact | abut.

  FIG. 14 shows a modified example in which the electronic component 27 on the main board 25 and the battery storage part 41 (back side base 24) are brought into contact with each other via a heat transfer member. The main substrate 25 and the back-side base 24 are provided with heat transfer members 141 and 142 for contacting each other. The heat transfer member 141 and the heat transfer member 142 are made of metal, for example. The heat transfer member 141 is provided in contact with the electronic component 27 on the main board 25. When the main board 25 and the back side base 24 are positioned and fixed to each other, the heat transfer member 141 functions as a leaf spring while the heat transfer member 141 functions as a leaf spring and the heat transfer member 142 functions as an electronic component 27 on the main board 25. Abut. By abutting through the members 141 and 142 having a higher thermal conductivity than air, heat radiation from the main board 25 to the back-side base 24 is efficiently performed. In addition, a heat transfer sheet having a relatively high thermal conductivity is provided on the circuit board or the back side substrate over the entire surface facing each other or at a position where the electronic component having a relatively large amount of heat generation is provided. A battery or a battery storage unit may be brought into contact.

  FIG. 15 shows a modification in which the electronic component 27 and the battery 23 are brought into contact with each other via the heat transfer member 151. The heat transfer member 151 is configured, for example, as a metal leaf spring, and is attached to the back-side base 24 (not shown in FIG. 15) and is in contact with the electronic component 27. When the battery 23 is inserted in the direction of the arrow in the figure, the heat transfer member 151 contacts the battery 23. Heat is efficiently radiated from the electronic component 27 to the battery 23 via the heat transfer member 151. It should be noted that the rear side base 24 may be provided with a through hole in a relatively wide range as in the front side base 22, and the battery 23 and the electronic component 27 may be brought into direct or indirect contact.

  The heat radiating space is not limited in size and shape as long as it is provided on the side opposite to the electronic component that generates heat when the voltage of the battery housing is applied. Moreover, the space provided in the battery storage part by the recessed part and the hole part may be included, and the space outside the battery storage part may be included. Even if another member is arranged between the battery housing part and the heat dissipation space, for example, the battery housing part is made of resin, whereas the member is made of the same resin as the sheet metal or the battery housing part, etc. If the member has a thermal conductivity equal to or higher than that of the battery housing portion, there is no problem with heat dissipation from the battery housing portion to the heat radiating space. Therefore, the member can be regarded as a part of the battery housing portion. . In addition, when a space such as a hole is provided in the battery storage portion and another member is disposed in the space, the member is provided in a space that should be originally occupied by the battery storage portion. The member can be regarded as a part of the battery storage unit. Therefore, for example, in the above-described embodiment, an imaging apparatus in which a slot for inserting a recording medium into the hole 22c of the front surface base 22 and thinner than the depth of the hole 22c is provided in the present invention. included.

  Electronic components generate a lot of heat when a voltage is applied, but examples of electronic components provided on the battery housing side include those that affect the operation of other electronic components due to heat generation, and temperature increases due to heat generation. What can be felt by the user.

It is a perspective view which shows the external appearance of the digital camera to which this invention is applied. It is a perspective view which decomposes | disassembles and shows the digital camera of FIG. It is a perspective view which decomposes | disassembles and shows the digital camera of FIG. It is sectional drawing in the IV-IV line of FIG. It is a perspective view which shows the base | substrate of the digital camera of FIG. It is a conceptual diagram which shows the imaging unit of the digital camera of FIG. It is a disassembled perspective view which shows the connection state of the exterior cover etc. of the digital camera of FIG. It is a perspective view which shows the mid bridge of the digital camera of FIG. It is sectional drawing which shows the attachment state of the midbridge of FIG. It is a top view which shows the attachment state of the mid bridge of FIG. It is a perspective view which shows the conductor of the digital camera of FIG. 1 in the state attached to the board | substrate. It is a perspective view shown in the state before attachment of the conductor of the digital camera of FIG. It is a perspective view which shows the conductor at the time of disassembling after the digital camera of FIG. 1 is assembled. It is a figure which shows the modification of the digital camera of FIG. It is a figure which shows the modification of the digital camera of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Housing, 3 ... Imaging unit, 4 ... Display part, 27 ... Heat-generating member, 27 ... Circuit board, 23 ... Battery, 41 ... Battery storage part, 42 ... Radiation space.

Claims (5)

An imaging unit for imaging a subject from one side of the housing;
A display unit for displaying an image on the other surface of the housing;
A circuit board provided with electronic components that generate heat;
A battery compartment capable of accommodating a battery;
With
The circuit board and the battery housing part are provided in a stacked manner in the order of the circuit board and the battery housing part from the other surface side to the one surface side,
The electronic component is provided on the circuit board side of the circuit board,
A heat radiation space is formed on the one surface side of the battery storage unit.   The imaging device according to claim 1, wherein the circuit board and the battery storage unit provided in a stacked manner are disposed adjacent to the imaging unit in the stacking direction.   The imaging device according to claim 1, wherein a hole is provided on the one surface side of the battery storage unit, and the heat dissipation space is formed including the hole.   The imaging device according to claim 1, wherein the hole is formed in a shape capable of supporting at least a part of the battery by at least one end surface of the hole. A heat transfer member provided between the electronic component and the battery housing or the battery;
The imaging apparatus according to claim 1, wherein the heat transfer member is in contact with an electronic component and is capable of contacting the battery storage unit or the battery.

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