JP2010251780A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus for improving cooling efficiency. <P>SOLUTION: The electronic apparatus provided with housing for accommodating a heating element includes a housing, a circuit board 11 accommodated in the housing, a surface mounting component 21 mounted on the circuit board 11, a heat generating component 22b mounted on the circuit board, a reinforcing member 27 having heat conducting property and reinforcing an region on the circuit board 11 where the surface mounting component 21 is mounted, and a heat dissipation unit extended from the reinforcing member 27 and thermally connected to the heat generating component 22b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electronic device.

2. Description of the Related Art Conventionally, when a surface mount component such as a BGA (Ball Grid Array) package is mounted on a circuit board, it is widely used to suppress a stress applied to a soldered portion of the surface mount component.
For example, Patent Document 1 discloses a circuit board having an outer edge dimension larger than an outer edge dimension of a surface-mounted circuit component and mounting a reinforcing plate in an area of a circuit board body on which the surface-mounted circuit component is mounted. ing.

JP 2006-210852 A

  However, in the conventional technique as shown in Patent Document 1, no consideration is given to efficiently cooling the heat generated from the electronic components or the like by using the mounting form of the reinforcing plate and the material of the reinforcing plate.

  An object of the present invention is to provide an electronic device that can improve cooling efficiency.

  In order to solve the above-described problem, an electronic apparatus according to an aspect of the present invention includes a housing, a first surface accommodated in the housing, and a first surface positioned on a side opposite to the first surface. A circuit board having two surfaces, a first electronic component mounted on the first surface of the circuit board, and the second electronic device being in contact with the second surface of the circuit board. A reinforcing member having a plurality of corner portions corresponding to the corners of the component, and a plate portion that extends along these corner portions and is mounted along the outer edge of the first electronic component and reinforces the area of the circuit board. And the second electronic component mounted on the second surface of the circuit board, and located outside the mounting area of the reinforcing member, and positioned outside the mounting area of the reinforcing member, A third electronic component mounted on the second surface; and extending from the reinforcing member; A first heat receiving unit that is thermally connected to the child part, the extended from the reinforcing member, characterized by comprising a second heat receiving unit that is thermally connected to the third electronic component.

  An electronic device according to one aspect of the present invention includes a housing, a first surface accommodated in the housing, and a second surface located on the opposite side of the first surface. The circuit board, the first electronic component mounted on the first surface of the circuit board, and the second surface of the circuit board, which correspond to the corners of the first electronic component A reinforcing member having a plurality of corner portions, and a plate portion that extends over the corner portions and is mounted along the outer edge of the first electronic component and reinforces the area of the circuit board; and A second electronic component mounted on the second surface of the circuit board, located outside the mounting area, and thermally connected to the reinforcing member and thermally connected to the second electronic component And a section.

  An electronic apparatus according to one aspect of the present invention includes a housing, a circuit board housed in the housing, a first electronic component provided on the circuit board, and the first electronic component. A reinforcing member in contact with the circuit board along the outer edge, a second electronic component provided on the circuit board at a position deviating from the position where the reinforcing member is mounted, and a configuration separate from the reinforcing member And a heat transfer member attached to the reinforcing member and having a heat receiving part that receives heat from the second electronic component at a position away from the reinforcing member.

  An electronic device according to one aspect of the present invention includes a housing, a circuit board housed in the housing, a first electronic component provided on the circuit board, and the first electronic component. A second electronic component provided on the circuit board in a region deviated from the mounted position; a reinforcing part in contact with the circuit board along an outer edge of the first electronic part; and a connection with the reinforcing part And a reinforcing member having a heat receiving portion facing the second electronic component and receiving heat from the second electronic component on a surface wider than the connecting portion. Features.

  According to said structure, the electronic device which can improve cooling efficiency can be provided.

1 is a perspective view of a portable computer according to a first embodiment of the present invention. 1 is a perspective view showing the inside of a casing of a portable computer according to a first embodiment. Sectional drawing which follows the F3-F3 line | wire of the circuit board shown in FIG. FIG. 3 is a cross-sectional view of the portable computer shown in FIG. 2 taken along line F4-F4. FIG. 3 is a cross-sectional view of the portable computer shown in FIG. 2 taken along line F5-F5. FIG. 2 is a plan view schematically showing the inside of the display unit of the portable computer according to the first embodiment. The figure which shows the reinforcement board which concerns on 1st Embodiment. The figure which shows the mounting form of the reinforcement board which concerns on 1st Embodiment. The figure which shows the reinforcement board which concerns on 2nd Embodiment. The top view which shows typically the inside of the display unit of the portable computer which concerns on 3rd Embodiment. The figure which shows the reinforcement board which concerns on 3rd Embodiment. The top view which shows typically the inside of the display unit of the portable computer which concerns on 4th Embodiment. The figure which looked at the inside of the display unit of the portable computer concerning a 4th embodiment from the side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings applied to a portable computer.
1 to 7 disclose a portable computer 1 as an electronic apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the portable computer 1 includes a main body 2 and a display unit 3.

  The main body 2 includes a main body base 4 and a main body cover 5. The main body cover 5 is combined with the main body base 4 from above. As the main body base 4 and the main body cover 5 cooperate with each other, the main body 2 includes a housing 6 formed in a box shape. The housing 6 has an upper wall 6a, a peripheral wall 6b, and a lower wall 6c. The upper wall 6 a supports the keyboard 7. The peripheral wall 6b has a front peripheral wall 6ba, a rear peripheral wall 6bb, a left peripheral wall 6bc, and a right peripheral wall 6bd.

  The display unit 3 includes a display housing 8 and a liquid crystal display panel 9 accommodated in the display housing 8. The liquid crystal display panel 9 has a display screen 9a. The display screen 9 a is exposed to the outside of the display housing 8 through the opening 8 a on the front surface of the display housing 8.

  The display unit 3 is supported by a rear end portion of the housing 6 via a hinge device. Thereby, the display unit 3 is rotatable between a closed position where the display unit 3 is tilted so as to cover the upper wall 6a from above, and an open position where the display unit 3 stands so as to expose the upper wall 6a.

As shown in FIG. 2, the housing 6 houses a circuit board 11, a cooling fan 12, first and second heat pipes 13 and 14, and first and second heat radiating members 15 and 16.
The circuit board 11 has a first surface 11a and a second surface 11b. An example of the first surface 11a is the upper surface of the circuit board 11, for example. The first surface 11a faces the upper wall 6a and is a so-called surface. An example of the second surface 11b is, for example, the lower surface of the circuit board 11, and is formed on the back side of the first surface 11a. The second surface 11b faces the lower wall 6c and is a so-called back surface.

  For example, a first heat generating component 21 is mounted on the first surface 11 a of the circuit board 11. For example, second heat generating components 22 a and 22 b are mounted on the second surface 11 b of the circuit board 11. A plurality of other circuit components (not shown) are mounted on the circuit board 11. The heat generating components 21, 22 a, and 22 b are components that generate a particularly large amount of heat among the circuit components mounted on the circuit board 11.

  An example of each of the heat generating components 21, 22a, and 22b is, for example, an electronic component such as a semiconductor package having a bump such as a CPU (Central Processing Unit) substrate, BGA (Ball Grid Array) and CSP (Chip Size Package), or a graphics chip. , Various chip sets or memories. However, the heat generating component to which the embodiment of the present invention is applicable is not limited to the above example. The heat generating components 21, 22a, and 22b correspond to various electronic components for which heat dissipation is desired. Compared with the cooling fan 12, the first and second heat generating components 21, 22a, and 22b are disposed, for example, near the front peripheral wall 6ba side of the portable computer, that is, near the peripheral wall corresponding to the user side.

  As shown in FIGS. 2 and 3, the first heat generating component 21 is attached with the heat receiving portion 13 a of the first heat pipe 13. The first heat pipe 13 is an example of a first heat transfer member. The heat receiving portions 14a and 14b of the second heat pipe 14 are attached to the second heat generating components 22a and 22b. The second heat pipe 14 is an example of a second heat transfer member. The first heat pipe 13 is thermally connected to the first heat generating component 21 via the heat receiving block 24. The second heat pipe 14 is thermally connected to the second heat generating components 22a and 22b via the heat radiating portions 28a1 and 28b1 of the reinforcing plate 27. For example, a groove 24 a is dug in the heat receiving block 24 along the extending direction of the first heat pipe 13. The heat receiving block 24 is made of, for example, metal and has a high thermal conductivity. The reinforcing plate 27 and the heat radiation portions 28a1 and 28b1 will be described later with reference to FIGS.

  The heat receiving portion 13a of the first heat pipe 13 is fitted into the groove 24a of the heat receiving block 24, for example. That is, the first heat pipe 13 is caulked in the groove 24a. The heat receiving portions 14a and 14b of the second heat pipe 14 are, for example, soldered to the heat radiating portions 28a1 and 28b1. The heat receiving block 24 is placed on the first heat generating component 21 with a heat transfer member 25 interposed between the heat receiving block 24 and the first heat generating component 21. The heat radiating portions 28a1 and 28b1 are placed on the second heat generating components 22a and 22b with the heat transfer members 25 interposed between the heat generating portions 28a and 28b1 and the second heat generating components 21, 22a and 22b, respectively. An example of the heat transfer member 25 is grease or a heat transfer sheet, for example.

As shown in FIG. 2, the heat receiving block 24 and the heat radiating portions 28 a 1 and 28 b 1 are fixed to the circuit board 11 using a fixture 26. The fixing device 26 includes a holding spring portion 26a that supports the heat receiving block 24 and the heat radiating portions 28a1 and 28b1, and a leg portion 26b that extends from the holding spring portion 26a toward the circuit board 11 and is screwed to the circuit board 11. Have When the heat pipe is fastened to the heat receiving block 24, for example, as shown in FIG. 2, a cover 26a1 may be provided between the presser spring portion 26a and the heat pipe 13 and the heat receiving block 24. By doing so, the heat pipe 13 can be more firmly held at the mounting position of the heat receiving block 24. As described above, in this embodiment, the heat receiving block 24, the heat radiating portions 28a1 and 28b1, and the heat pipes 13 and 14 are sandwiched between the circuit board 11 and the fixture 26, so that their positions are fixed.
However, the attachment method of the heat pipes 13 and 14 is not limited to fitting, and may be, for example, soldering or other methods.
As shown in FIG. 2, the cooling fan 12 is disposed in the vicinity of the left peripheral wall 6 bc in the housing 6. The circuit board 11 is cut out so that a portion corresponding to the cooling fan 12 avoids the cooling fan 12. That is, as shown in FIG. 4, the cooling fan 12 is provided at a position away from the circuit board 11 and is offset from the circuit board 11. The cooling fan 12 is arranged side by side with the circuit board 11 along a direction parallel to the board surface of the circuit board 11 (for example, the horizontal direction in the present embodiment).

  In the left peripheral wall 6bc of the housing 6 corresponding to the cooling fan 12, for example, a plurality of exhaust holes 28 are provided. The exhaust hole 28 opens to the outside of the housing 6. The cooling fan 12 has an intake port 12a for sucking air and an exhaust port 12b for discharging the sucked air. The air inlet 12a is opened on, for example, the upper surface and the lower surface of the cooling fan 12, respectively. The exhaust port 12b opens on the side surface of the cooling fan 12 and faces the exhaust hole 28 of the left peripheral wall 6bc. The cooling fan 12 discharges air toward the exhaust hole 28.

  The first and second heat dissipating members 15 and 16 are disposed in the vicinity of the left peripheral wall 6bc of the housing 6 that is separated from the circuit board 11. Specifically, as shown in FIG. 2, the first and second heat radiating members 15 and 16 are both disposed between the exhaust port 12b of the cooling fan 12 and the exhaust hole 28 of the left peripheral wall 6bc. Both the first and second heat radiating members 15 and 16 extend in parallel to each other along a direction crossing the air discharge direction of the cooling fan 12. The first and second heat radiating members 15 and 16 are arranged side by side along the air flow direction. In the present embodiment, the first heat radiating member 15 is disposed, for example, between the second heat radiating member 16 and the cooling fan 12.

  An example of the first and second heat radiating members 15 and 16 is formed by a plurality of fin elements 31 being assembled. The fin element 31 is a plate-like member formed in a rectangular shape, for example. The fin element 31 is made of a metal having a high thermal conductivity such as aluminum. The plurality of fin elements 31 are arranged such that the plate surfaces are spaced from each other and the plate surfaces thereof are along the air flow direction from the cooling fan 12.

  The first heat pipe 13 extends from the heat receiving portion 13 a attached to the first heat generating component 21 along the first surface 11 a of the circuit board 11 toward the left peripheral wall 6 bc of the housing 6. As described above, the first heat-generating component 21 is located closer to the front peripheral wall 6ba of the housing 6 than the cooling fan 12 is. The cooling fan 12 has a front side surface 12 c that faces the front peripheral wall 6 ba of the housing 6. The first heat pipe 13 extends along the front side surface 12 c of the cooling fan 12.

  The first heat pipe 13 extending until the circuit board 11 is removed is bent toward the first heat radiating member 15. As shown in FIG. 5, the first heat pipe 13 bent in the direction facing the first heat radiating member 15 is bent toward the center in the vertical direction of the first heat radiating member 15. That is, the first heat radiating member 15 is bent toward the lower wall 6 c of the housing 6.

  And the front-end | tip part of the 1st heat pipe 13 is extending along the exhaust port 12b of the cooling fan 12, and is making the several fin element 31 skewered. In other words, the first heat radiating member 15 is formed by fitting a plurality of fin elements 31 having an opening in the center to the first heat pipe 13.

  That is, the first heat pipe 13 is provided between the first heat generating component 21 and the first heat radiating member 15. The heat receiving portion 13 a of the first heat pipe 13 is thermally connected to the first heat generating component 21. The other end 13 b of the first heat pipe 13 is thermally connected to the first heat radiating member 15. The 1st heat pipe 13 has a working fluid inside, and moves heat between both ends 13a and 13b using heat of vaporization and capillary action. The first heat pipe 13 transmits heat generated by the first heat generating component 21 to the first heat radiating member 15.

  The second heat pipe 14 extends from the heat receiving portions 14a and 14b attached to the second heat generating components 22a and 22b toward the left peripheral wall 6bc of the housing 6 along the second surface 11b of the circuit board 11. Yes. As described above, the second heat generating components 22 a and 22 b are located closer to the front peripheral wall 6 ba of the housing 6 than the cooling fan 12. The second heat pipe 14 extends along the front side surface 12 c of the cooling fan 12.

  The second heat pipe 14 extending until the circuit board 11 is removed is bent toward the second heat radiating member 16. As shown in FIG. 5, the second heat pipe 14 bent in the direction facing the second heat radiating member 16 is bent toward the vertical center of the second heat radiating member 16. That is, the second heat radiating member 16 is bent toward the upper wall 6 a of the housing 6. And the front-end | tip part of the 2nd heat pipe 14 is extending along the exhaust port 12b of the cooling fan 12, and is making the several fin element 31 skewered. A plurality of fin elements 31 are respectively fitted to the second heat pipe 14 to form the second heat radiating member 16.

The second heat pipe 14 is provided between the second heat generating component 22 a, the second heat generating component 22 b, and the second heat radiating member 16. The heat receiving portions 14a and 14b of the second heat pipe 14 are thermally connected to the second heat generating components 22a and 22b, respectively. The other end 14 b of the second heat pipe 14 is thermally connected to the second heat radiating member 16. The second heat pipe 14 transfers heat generated by the second heat generating components 22 a and 22 b to the second heat radiating member 16.
For example, in order to increase the installation area for the heat receiving block 24 or the heat radiation portions 28a1 and 28b1, the first and second heat pipes 13 and 14 are, for example, a state in which a φ6 heat pipe is crushed in the vertical direction to a thickness of about 3 mm. used.

  Both the first and second heat pipes 13 and 14 extend along the same side surface 12 c of the cooling fan 12. For example, when viewed from above the housing 6, the first and second heat pipes 13 and 14 draw substantially the same trajectory.

  Next, the configuration of the reinforcing plate in the present embodiment will be described with reference to FIGS. FIG. 6 is a plan view schematically showing the inside of the display unit of the portable computer according to the first embodiment. FIG. 7 is a view showing a reinforcing plate according to the first embodiment. FIG. 8 is a side view of the inside of the display unit of the portable computer according to the first embodiment. FIG. 8 shows the configuration of the second heat generating component 22b and the reinforcing plate 27 for easy understanding of the mounting form, but it goes without saying that the configuration of the second heat generating component 22a and the reinforcing plate 27 is the same. Nor.

  The reinforcing plate 27 of the present embodiment is similar to the bottom surface (mounting surface) of the first heat generating component 21 and is made of, for example, a metal having high rigidity and thermal conductivity, and has an outer edge size larger than the outer edge size. An opening 27e is formed at the center.

  As shown in FIGS. 6 and 7, the strong plate 27 is attached so as to surround the first heat-generating component 21 when viewed from the first surface 11 a side of the circuit board 11. The mounting site of the first heat generating component 21 is reinforced. As a result, even if external stress is applied to the circuit board 11, warpage and deformation of the circuit board 11 can be suppressed at the mounting portion of the first heat-generating component 21, and the first heat generation by the solder ball, the adhesive member, or the like. It becomes possible to maintain the bonding between the component 21 and the circuit board 11 in a good state.

  The reinforcing plate 27 of this embodiment has an opening 27e at the center, but it has a function of reinforcing the mounting portion of the first heat generating component 21 on the circuit board 11 by rigidity. For example, the opening 27e is not always necessary. In addition, the reinforcing plate 27 of the present embodiment is configured on a flat plate having an outer edge size larger than the outer edge size of the first heat generating component 21, but the mounting portion of the first heat generating component 21 on the circuit board 11 due to rigidity. If it has the function which reinforces, it does not need to be flat form, for example, a cross section may be a rectangular shape or an arc shape.

  As shown in FIGS. 6 and 7, the reinforcing plate 27 of the present embodiment includes four corner portions 27a, 27b, 27c, and 27d, and plate portions 27ab and 27bc provided across the corner portions 27a to 27d, respectively. 27 cd, 27 da, holes 27 a 1, 27 b 1, 27 c 1, 27 d 1 corresponding to the corners 27 a to 27 d, and extending portions 28 a, 28 b.

  The extending portions 28 a and 28 b extend from the reinforcing plate 27 and are formed integrally with the reinforcing plate 27. The extending portions 28a and 28b include heat radiating portions 28a1 and 28b1 and connecting portions 28a2 and 28b2 provided across the extending portions 28a and 28b and the heat radiating portions 28a1 and 28b1.

  Here, as shown in FIG. 8, the heat radiating portions 28a1 and 28b1 face the second heat generating components 22a and 22b, and are thermally connected to the second heat generating components 22a and 22b. Is provided. The heat receiving surfaces 28a3 and 28b3 are spaced apart from the second surface 11b of the circuit board 11 with a gap higher than the mounting height of the second heat generating components 22a and 22b, for example, via grease or a heat transfer sheet, or Directly connected to the second heat generating components 22a and 22b.

  With such a configuration, in the portable computer 1 of the present embodiment, heat from the second heat generating components 22a and 22b is transmitted to the heat radiating portions 28a1 and 28b1 to cool the second heat generating components 22a and 22b. be able to. Since the reinforcing plate 27 of the present embodiment is made of a metal material having high thermal conductivity, the heat radiating portions 28a1 and 28b1 thermally connected to the reinforcing plate 27 efficiently radiate heat with a wider surface area. Can do.

  In the heat radiating portions 28a1 and 28b1 of the present embodiment, the thicknesses Sa and Sb according to the mounting height of the heat generating components 22a and 22b are appropriately adopted. In addition, in the connection portions 28a2 and 28b2 of the present embodiment, the inclination angles θa and θb according to the mounting height of the heat generating components 22a and 22b are appropriately adopted. Here, “wall thickness” refers to the thickness of the member, and refers to the wall thickness most widely adopted among the members.

  In the present embodiment, the heat radiating portions 28a1 and 28b1 are thermally connected to the same heat pipe 14, but with such a configuration, the thicknesses Sa and Sb of the heat radiating portions 28a1 and 28b1 and the connecting portions 28a2 and 28b2 are connected. By adjusting the inclination angles θa and θb, the height of contact with the heat pipe 14 can be made uniform, and the contact surface with the heat pipe 14 becomes uneven between the heat radiating portion 28a1 and the heat radiating portion 28b1. Or a load on the heat pipe 14 can be suppressed.

  The circuit board 11 of the present embodiment has through holes (not shown) that correspond to the holes 27a1 to 27d1 and that are formed between the first surface 11a and the second surface 11b of the circuit board 11. . The leg portions 26b of the fixture 26 of the first heat generating component 21 are fastened and fixed to the holes 27a1 to 27d1 of the reinforcing plate 27 with screws or the like through the through holes. In the present embodiment, the holes 27b1 and 27d1 of the reinforcing plate 27 are shared by the fixtures 26 of the heat generating components 21 and 22a, respectively. Specifically, as shown in FIG. 7, the holes 27b1 and 27d1 of the reinforcing plate 27 correspond to the leg portions 26b of the fixture 26 of the first heating component 21 from the first surface 11a side of the circuit board 11. A screw (not shown) to be fitted is fitted, and a screw corresponding to the leg portion 26b of the fixture 26 of the second heat generating component 22a is fitted from the second surface 11b side. With such a configuration, the portable computer 1 according to the present embodiment enables high-density mounting of components housed in the housing and reduction of fixing tools such as screws.

Next, the operation of the portable computer 1 will be described.
When the portable computer 1 is used, the first and second heat generating components 21, 22a and 22b generate heat. The heat generated in the first heat generating component 21 is transmitted to the first heat radiating member 15 by the first heat pipe 13 through the heat receiving block 24. The heat generated in the second heat generating components 22a and 22b is transmitted to the second heat radiating member 16 by the second heat pipe 14 through the heat radiating portions 28a1 and 28b1.

  When the cooling fan 12 is driven, air is discharged from the exhaust port 12b, and the first and second heat radiating members 15 and 16 are forcibly cooled. The heat moved from the heat generating components 21, 22 a, 22 b to the first and second heat radiating members 15, 16 is transmitted to the air discharged from the cooling fan 12 and is exhausted to the outside of the housing 6 through the exhaust holes 28. As a result, the cooling of the first and second heat generating components 21, 22a, 22b is promoted.

  According to the portable computer 1 having such a configuration, the plurality of heat generating components 21, 22a and 22b can be cooled, and the heat generating components 21, 22a and 22b can be mounted with high density. That is, the heat pipes 13 and 14 are attached to the heat generating components 21, 22 a and 22 b mounted separately on the front surface and the back surface of the circuit board 11, and the heat radiating members 15 and 16 to which the heat pipes 13 and 14 are connected are provided as one. For example, the cooling of the plurality of heat generating components 21, 22 a, and 22 b can be promoted by collecting them at the locations and cooling them with one cooling fan 12, for example.

  In the present embodiment, the reinforcing plate 27 that has thermal conductivity and reinforces the mounting area of the heat generating component 21 is thermally connected to the heat radiating portions 28a1 and 28b1 for releasing the heat of the heat generating components 22a and 22b. Has been. With such a configuration, the reinforcing plate 27 can be used as a part of the cooling structure, and the cooling efficiency can be improved.

  By mounting the plurality of heat generating components 21, 22 a and 22 b separately on the front surface and the back surface of the circuit board 11, the first heat pipe 13 and the second heat pipe 14 are along one surface of the circuit board 11. To avoid being next to each other. That is, it is less necessary to consider the space required for routing the heat pipe, and the first heat generating component 21 and the second heat generating components 22a and 22b can be arranged close to each other on the back and front. Thereby, the several heat-emitting components 21, 22a, 22b can be mounted with high density.

  If the plurality of heat generating components 21, 22 a, 22 b can be arranged close to each other, it is possible to reduce the number of places where the temperature becomes high in the circuit board 11, and to achieve a layout arrangement with good cooling efficiency. For example, the plurality of heat generating components 21, 22 a, and 22 b can be mounted in a concentrated manner, for example, under the keyboard 7, for example, while the user does not touch the palm rest 33, for example.

  When it is avoided that the first heat pipe 13 and the second heat pipe 14 are adjacent to each other along one surface of the circuit board 11, the degree of freedom in routing the heat pipe increases. This contributes to routing the plurality of heat pipes 13 and 14 in the housing 6 with limited space. For example, both the first and second heat pipes 13 and 14 extend along the same side surface 12 c of the cooling fan 12. The fact that the two heat pipes 13 and 14 wrap around the cooling fan 12 from the same direction contributes to the routing of the plurality of heat pipes 13 and 14 in the housing 6 with limited space. In other words, this contributes to miniaturization of the portable computer 1.

  For example, there is a user who uses the portable computer 1 while tilting the keyboard 7 backward and upward because the keyboard 7 is tilted backward and upward (that is, as the keyboard 7 becomes higher as the user moves away from the user). When the portable computer 1 according to this embodiment is inclined rearward and upward, the first and second heat radiating members 15 and 16 are positioned above the vertical direction as compared with the first and second heat generating components 21, 22 a and 22 b. Will do. That is, both the first and second heat pipes 13 and 14 are in a bottom heat state in which the heat receiving portions 13a, 14a, and 14b are located below and the heat radiating portions 13b and 14b are located above. The heat pipe has a higher heat transfer efficiency in the bottom heat state than in the top heat state due to its operating principle using the capillary phenomenon.

In addition, by disposing one of the first and second heat radiating members 15 and 16 that requires further cooling on the peripheral wall side of the housing 6 in which the opening is formed, heat can be radiated efficiently.
According to the portable computer 1 according to the present embodiment, the two heat pipes 13 and 14 can be caused to wrap around the cooling fan 12 from the same direction, so that the plurality of heat pipes 13 and 14 are likely to be in the bottom heat state. Layout design can be performed.

When the first and second heat radiating members 15 and 16 are arranged back and forth along the air flow direction from the cooling fan, the two heat radiating members 15 and 16 are effectively cooled by, for example, one cooling fan 12. be able to.
By disposing the cooling fan 12 alongside the circuit board 11 along a direction parallel to the surface of the circuit board 11, the mounting height of the entire module arranged in the housing 6 can be suppressed. That is, the casing 6 can be made thinner than when the cooling fan 12 is placed on the circuit board 11. In addition, although the 1st and 2nd heat pipes 13 and 14 of a present Example showed the example connected to the 1st and 2nd heat radiating members 15 and 16, respectively, it is not restricted to this, The same heat dissipation. It may be connected to a member. With such a configuration, it is possible to reduce the size of the casing 6 and the size of the circuit board 11.

  Here, the first heat-generating component 21 has been described as an example. However, any surface-type mounting component in which the mounting area is reinforced by the reinforcing plate 27 may be used, and a component that does not generate heat may be used. .

  In the present embodiment, the example in which the reinforcing plate 27 is provided on the surface 11b located on the opposite side to the surface 11a on which the first heat generating component 21 is provided has been described. Since it only has to function to reinforce the mounting area of the heat generating component 21, the same surface may be used. In this case, the inner edge dimension of the opening 27 e of the reinforcing plate 27 is designed to be larger than the outer edge dimension of the first heat generating component 21 so as to surround the mounting region of the first heat generating component 21. By configuring in this way, it is possible to realize further high-density mounting of electronic components on one side of the circuit board. In this embodiment, even when the heating elements are densely packed, the cooling process of each heating element can be efficiently performed by using the cooling structure using the reinforcing plate 27.

  Further, in the present embodiment, an example in which the heat dissipating part 28a1 and the heat dissipating part 28b1 are separated from each other has been shown. It may be combined to increase the heat dissipation area.

In this embodiment, a plurality of heat generating components mounted around the reinforcing plate 27 can be cooled by having a plurality of heat radiation portions 28a1 and 28b1.
Next, a portable computer 1 as an electronic apparatus according to a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a view showing a reinforcing plate according to the second embodiment. Note that configurations having the same or similar functions as those of the portable computer according to the first embodiment are denoted by the same reference numerals and description thereof is omitted. This 2nd Embodiment differs in the shape of the reinforcement board 27 with respect to the said 1st Embodiment. The portable computer 1 of the second embodiment has almost the same appearance as that shown in FIG.

  The casing 6 of the portable computer 1 in the second embodiment accommodates the circuit board 11, the first and second heat generating components 21, 22 a and 22 b, and the reinforcing plate 27. The reinforcing plate 27 of the second embodiment and the heat radiating portions 28a1 and 28b1 are configured as separate bodies. These contribute to improvement in manufacturability and cost reduction of the portable computer 51.

With such a configuration, the configuration of the reinforcing plate 27 of the first embodiment can be realized more simply, and the same effect as the reinforcing plate 27 of the first embodiment can be obtained.
Moreover, in the structure of 2nd Embodiment, the thermal radiation part 28a1, 28b1 comprised as a different body should just have heat conductivity, and the reinforcement board 27 does not necessarily need to have high heat conductivity. For example, when the reinforcing plate 27 has rigidity but is made of a material such as a resin having low thermal conductivity, heat from the heat radiating portions 28a1 and 28b1 can be prevented from being transmitted to the circuit board 11.

Thus, in 2nd Embodiment, the thermal radiation part 28a1, 28b1 can be hold | maintained by utilizing the mounting form of the reinforcement board 27. FIG.
Next, a portable computer 1 as an electronic apparatus according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a plan view schematically showing the inside of the display unit of the portable computer according to the third embodiment. FIG. 11 is a view showing a reinforcing plate according to the third embodiment.

  Note that configurations having the same or similar functions as those of the portable computer according to the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the third embodiment, the shape of the reinforcing plate 27 is different from that of the first embodiment. The portable computer 1 according to the third embodiment has almost the same appearance as that shown in FIG.

  The casing 6 of the portable computer 1 in the third embodiment includes a circuit board 11, a cooling fan 12, first and second heat pipes 13 and 14, and first and second heat radiating members 15 and 16, For example, a third heat generating component 22 c is mounted on the second surface 11 b of the circuit board 11 and in a region within the opening 27 e of the reinforcing plate 27. The third heat generating component 22c has a large amount of heat generation among the circuit components mounted on the circuit board 11, for example, similarly to the first and second heat generating components 21, 22a, and 22b.

  Further, the reinforcing plate 27 of the third embodiment has a heat radiating portion 28c1 corresponding to the third heat generating component 22c. The heat radiating portion 28c1 is thermally connected to the reinforcing plate 27 in the same manner as the heat radiating portions 28a1 and 28b1. With such a configuration, it is possible to achieve higher density mounting of housing housing components and obtain the same effect as the portable computer 1 of the first embodiment.

  Next, a portable computer 1 as an electronic apparatus according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a plan view schematically showing the inside of the display unit of the portable computer according to the fourth embodiment. FIG. 13 is a side view of the inside of the display unit of the portable computer according to the fourth embodiment. FIG. 13 shows the configuration of the second heat generating component 22b and the reinforcing plate 27 for easy understanding of the mounting form, but it goes without saying that the configuration of the second heat generating component 22a and the reinforcing plate 27 is the same. Nor.

  Note that configurations having the same or similar functions as those of the portable computer according to the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the fourth embodiment, the mounting positions of the heat radiating portions 28a1 and 28b1 are different from those of the first embodiment. The portable computer 1 according to the fourth embodiment has almost the same appearance as that shown in FIG.

  In the fourth embodiment, the heat pipe 14 is provided between the heat radiating portions 28a1 and 28b and the second heat generating components 22a and 22b. As described above, since the heat radiating portions 28a1 and 28b1 of the present embodiment are respectively held by the reinforcing plates 27 by the connecting portions 28a2 and 28b2, they can perform the same function as a so-called cantilever spring. Therefore, by adjusting the distance between the surface of the circuit board and the heat radiating portions 28a1, 28b1, it plays a role in place of the fixing member 26, and the heat pipe 14 can be fixed to the second heat generating components 22a, 22b.

  By adopting such a configuration, in this embodiment, the heat pipe 14 can be pressure-bonded to the second heat generating components 22a and 22b without using the pressing fixing member 26 and the like, so that the number of components can be reduced. Realize.

  Although the portable computer 1 according to the first to fourth embodiments has been described above, the embodiment of the present invention is not limited to these. The components according to the first to fourth embodiments can be implemented in combination as appropriate.

For example, the reinforcing plate 27 and the heat radiating portion 28d according to the third embodiment may be configured separately as in the second embodiment.
The electronic apparatus to which the present invention can be applied is not limited to a portable computer, and can be applied to various electronic apparatuses such as a digital camera, a video camera, and a personal digital assistant.

DESCRIPTION OF SYMBOLS 1 ... Portable computer 6 ... Housing 6b ... Perimeter wall 11 ... Circuit board 11a ... 1st surface 11b ... 2nd surface 12 ... Cooling fan 12b, 12d ... Exhaust port 12c ... Side surface 13 ... 1st heat pipe 14 ... 1st 2 heat pipes 15 ... first heat radiating member 16 ... second heat radiating member 21 ... first heat generating component 22a, 22b ... second heat generating component 27 ... reinforcing plate 27a, 27b, 27c, 27d ... corner portion 27ab, 27bc, 27cd, 27da ... Plate portion 27a1, 27b1, 27c1, 27d1 ... Hole 28a, 28b ... Extension portion 28c, 28d ... Heat dissipation portion 28ac, 28bd ... Connection portion 281 ... Exhaust hole 46 ... Third heat generating component.

Claims (11)

A housing,
A circuit board housed in the housing and having a first surface and a second surface located on the opposite side of the first surface;
A first electronic component mounted on the first surface of the circuit board;
A plurality of corner portions that are in contact with the second surface of the circuit board and correspond to the corners of the first electronic component, and are mounted along the outer edge of the first electronic component across the corner portions. A plate member that reinforces the area of the circuit board, and a reinforcing member,
A second electronic component that is located off the mounting region of the reinforcing member and is mounted on the second surface of the circuit board;
A third electronic component that is located off the mounting region of the reinforcing member and is mounted on the second surface of the circuit board;
A first heat receiving portion extending from the reinforcing member and thermally connected to the second electronic component;
A second heat receiving portion extending from the reinforcing member and thermally connected to the third electronic component;
An electronic device characterized by comprising: 2. The plate portion according to claim 1, wherein the plate portion has an outer edge size larger than an outer edge size of the first electronic component, and has a frame shape in which an area in which another electronic component can be mounted is provided. The electronic device described. The plurality of corners of the reinforcing member are provided with screw holes through which screws are passed,
The electronic apparatus according to claim 2, wherein the heat receiving portion is provided at a position away from the center of the plate portion than the screw hole portion. A housing,
A circuit board housed in the housing and having a first surface and a second surface located on the opposite side of the first surface;
A first electronic component mounted on the first surface of the circuit board;
A plurality of corner portions that are in contact with the second surface of the circuit board and correspond to the corners of the first electronic component, and are mounted along the outer edge of the first electronic component across the corner portions. A plate member that reinforces the area of the circuit board, and a reinforcing member,
A second electronic component that is located off the mounting region of the reinforcing member and is mounted on the second surface of the circuit board;
A heat receiving portion thermally connected to the reinforcing member and thermally connected to the second electronic component;
An electronic device characterized by comprising:   The heat receiving portion has one end connected to the reinforcing member, and the other end located on the opposite side of the one end from the reinforcing member and the circuit board. The electronic device according to claim 4. 6. The plate portion according to claim 5, wherein the plate portion has an outer edge size larger than an outer edge size of the first electronic component, and has a frame shape in which an area in which another electronic component can be mounted is provided. The electronic device described. The plurality of corners of the reinforcing member are provided with screw holes through which screws are passed,
The electronic apparatus according to claim 6, wherein the heat receiving portion is provided at a position where a distance from a center of the plate portion is separated from the screw hole portion.   The electronic apparatus according to claim 7, wherein the heat receiving unit is located farther from the circuit board than a mounting height of the second electronic component.   The electronic apparatus according to claim 8, wherein the heat receiving portion has a thickness different from a thickness of the reinforcing member. A housing,
A circuit board housed in the housing;
A first electronic component provided on the circuit board;
A reinforcing member in contact with the circuit board along an outer edge of the first electronic component;
A second electronic component provided on the circuit board at a position deviated from the position where the reinforcing member is mounted;
A heat transfer member that is configured as a separate body from the reinforcing member, and that has a heat receiving portion that is attached to the reinforcing member and receives heat from the second electronic component at a position away from the reinforcing member;
An electronic device characterized by comprising: A housing,
A circuit board housed in the housing;
A first electronic component provided on the circuit board;
A second electronic component provided on the circuit board in a region deviating from a position where the first electronic component is mounted;
A reinforcing portion that is in contact with the circuit board along an outer edge of the first electronic component; a connecting portion that is connected to the reinforcing portion; and the second electronic component that is wider than the connecting portion, A heat receiving portion that receives heat from the second electronic component, and a reinforcing member,
An electronic device characterized by comprising:

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