JP2006301277A - Cooling structure of electronic equipment and flat display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling structure of an electronic equipment capable of reducing thickness. <P>SOLUTION: The cooling structure comprises; a metal shield plate 30 for shielding an audio circuit substrate, a tuner circuit substrate and an IF circuit substrate accommodated in a case; and a metal heat dissipating member 31 for dissipating heat from the audio circuit substrate, and the heat dissipating member 31 and the shield plate 30 are connected. Thereby, since the shield member 30 functions as a member for performing electro-magnetic shield as well as the heat dissipating member, a size of the heat dissipating member 31 can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cooling structure for an electronic device and a flat display device having the cooling structure.

Conventionally, examples of the flat display device include a plasma display panel, a liquid crystal display panel, an organic EL (Electro Luminescence) panel, an FED (Field Emission Display), and an electrophoretic display panel.
In such a flat display device, an electronic device is provided in a housing, and the electronic device includes an audio circuit and a circuit board for configuring other circuits.

Generally, a heat generating member may be provided on a circuit board, and a heat radiating member called a heat sink is attached to the circuit board in order to release heat generated from the heat generating member.
For example, conventionally, a plurality of electronic components are provided on an upper portion of a printed wiring board, and an external member that functions as a heat sink is attached to these electronic components (Patent Document 1).

A microfilm (see FIG. 1) of Japanese Utility Model No. 5-12805 (Japanese Utility Model Publication No. 6-72291)

However, in Patent Document 1, an external member that functions as a heat sink in order to sufficiently dissipate heat from the electronic component is formed to have a larger height from the substrate than the electronic component.
In an electronic device having such an electronic component, the amount of heat generated from the electronic component is increased, but a reduction in thickness is required. However, in the configuration of Patent Document 1, the external member is formed larger than the electronic component. As an example, there is a problem that there is a limit to thinning.
In particular, flat display devices such as plasma display panels are becoming thinner, and the limit of reducing the size of the heat dissipation member is an obstacle to making the flat display panel thinner.

  In view of the above-described problems, an object of the present invention is to provide an electronic device cooling structure and a flat display device that can be reduced in thickness.

  The invention according to claim 1 is a cooling structure for an electronic device including a metal shield plate that is housed in a housing and shields at least the circuit board, and a metal heat dissipation member that radiates heat from the circuit board. The electronic device cooling structure is characterized in that the heat radiating member and the shield plate are joined.

  According to a seventh aspect of the present invention, there is provided a flat display device comprising the electronic device cooling structure according to any of the first to sixth aspects.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a configuration including a plasma display panel is exemplified as the flat display device of the present invention. However, the present invention is not limited to this. For example, a display such as a liquid crystal display panel, an organic EL panel, an FED, or an electrophoretic display panel Any configuration provided with a section can be applied.

(Configuration of flat display device)
A flat display device according to the present embodiment will be described with reference to the drawings.
FIG. 1 is an exploded perspective view showing a schematic configuration of a flat display device.
In FIG. 1, reference numeral 1 denotes a flat display device, and the flat display device 1 includes a housing 10. The housing 10 includes a front frame 11 in which a front cover (not shown) made of glass or the like is disposed in an opening, and a rear cover 12 provided on the back side of the front frame. The rear cover 12 has a convex portion that protrudes toward the back surface at the center thereof.
The front frame 11 is usually an integrally molded product made of synthetic resin.
The rear cover 12 is an integrally molded product and is made of metal in order to prevent leakage of electromagnetic waves from the inside of the housing 10.

Inside the housing 10 are housed a display unit 13 for displaying an image, a chassis 14 disposed on the back side of the display unit 13, and speakers 15 disposed on both sides of the chassis 14. .
The chassis 14 includes a panel drive circuit board 16 that controls an image of the display unit 13 based on an input image signal, and an audio circuit board 17 that controls an output signal to the speaker 15 based on the input audio signal. A tuner circuit board 18 that extracts audio signals and the like, electronic devices 19 other than these circuit boards, and a power supply unit 20 that supplies power to these circuit boards and electronic devices 19 are provided.

FIGS. 2 to 5 show the main part of the present embodiment.
FIG. 2 is a perspective view showing the main part of the present embodiment and showing the flat display device with the rear cover 12 removed.
In FIG. 2, the front frame 11 includes a frame main body 110 having a substantially rectangular outer shape, two short support portions 111 provided on the back side of the frame main body 110 so as to extend in a direction orthogonal to the longitudinal direction, A long support portion 112 whose side surface is joined to the lower end portion of the short support portion 111, and a substrate mounting portion 113 provided between the short support portion 111 and the long support portion 112. Yes.
The short support 111 has a substantially columnar shape, and an upper end portion (the back side of the flat display device) in the figure is inclined. The long support portion 112 is formed such that both end portions thereof are inclined.

The substrate mounting portion 113 includes a flat plate-shaped bottom plate portion 1130 (see FIGS. 3 to 5), a first upright portion 1131 formed upright from short sides of the bottom plate portion 1130 facing each other, and a bottom plate A second upright portion 1132 formed upright from one long side portion of the portion 1130 and an attachment piece portion 1133 provided at the intersection of the upright portions 1131 and 1132 are integrally formed, as shown in FIG. In this structure, the upper part and the front part are opened.
The first upright portion 1131 is bent at a substantially right angle on the way, and the bent portion is locked to the short-length support portion 111. The second upright portion 1132 is bent at a substantially right angle in the middle, and the bent portion is locked to the long support portion 112. The attachment piece 1133 is fixed to the long support 112 with screws (not shown).

An audio circuit board 17 and a tuner circuit board 18, which will be described later, and an electronic device 19 are attached to the board mounting portion 113. The power supply unit 20 is disposed above the substrate mounting portion 113, and the panel drive circuit substrate 16 is disposed on both the left and right sides of the substrate mounting portion 113. In FIG. 2, the right panel drive circuit board 16 is not shown.
These circuit boards and electronic devices 19 are connected to a video playback device (not shown) such as a TV tuner and a DVD player so that various signals can be transmitted and received, and video data transmitted from the video playback device as an analog signal or a digital signal is received. get. Then, the acquired video data is appropriately processed and transmitted to the display unit 13.
The electronic devices 19 include two fans 21, an AV circuit board 22 that supports the fans 21, an attachment member 23 for attaching the fan 21 to the AV circuit board 22, and a part of the AV circuit board 22. And a covering plate 24. The two fans 21 are arranged in parallel, and the outside air (cooling air) that flows in through the ventilation path P from the outside air ports 113A and 113B formed in the board mounting portion 113, which will be described later, to the power source portion 20 side. send.

FIG. 3 is a perspective view of the board attachment portion 113 in a state where the electronic devices 19 are attached. In FIG. 3, the fan 21, the mounting member 23, and the plate 24 are not shown. Further, FIG. 3 is opposite in direction to FIG.
In FIG. 3, an AV circuit board 22 is a circuit board for controlling video display, and is disposed substantially parallel to the bottom plate portion 1130.
The AV circuit board 22 and the circuit board 25 arranged adjacent to the AV circuit board 22 are respectively attached to the shield plate 30. The shield plate 30 is made of aluminum to shield the audio circuit board 17, the tuner circuit board 18, and the IF circuit board 25 (see FIG. 5) provided on the back side (upper side in the figure) of the tuner circuit board 18. It is formed in a planar rectangular shape having a size sufficient to cover these substrates. The IF circuit board 25 is a circuit board on which a video intermediate frequency amplifier circuit and the like are mounted.

A specific structure of the shield plate 30 is shown in FIGS.
FIG. 4 is a perspective view showing a state in which the AV circuit board 22 and the like are removed from FIG. 3 and the board attaching portion 113 is attached to the front frame 11. FIG. 5 is a perspective view showing a state where the shield plate 30 is removed from FIG.
4 and 5, the audio circuit board 17 and the IF circuit board 25 are arranged side by side at a predetermined interval on the bottom plate portion 1130, and a shield is provided between the audio circuit board 17 and the IF circuit board 25. A substantially frustoconical support protrusion 32 that supports the plate 30 is formed integrally with the bottom plate 1130.

The above-described outside air holes 113A and 113B are formed in the side wall portion of the second raised portion 1132 along the direction in which the circuit boards 17 and 25 are arranged. Among these, the outside air port 113A is a circular small hole, and a plurality of the outside air ports 113A are arranged in the vicinity of the audio circuit board 17, the IF circuit board 25, and the supporting protrusion 32. The outside air port 113B is formed in a large rectangular shape.
The audio circuit board 17 is provided with a heat-generating component (not shown). Therefore, the audio circuit board 17 is provided with a heat dissipation member 31 made of a metal having a high heat dissipation effect such as aluminum.

The heat radiating member 31 is formed in a plane U shape so as to surround the outside air ports 113A and 113B.
The heat radiating member 31 is formed so as to rise with respect to the audio circuit board 17, and a part of the heat radiating member 31 is bent to form a mounting portion 31 </ b> A for attaching the shield plate 30, and the remaining portion is a rectangular shape formed on the shield plate 30. An upper end portion 31B that contacts the shaped opening 30A is formed. The heat radiating member 31 is joined to the shield plate 30 at the attachment portion 31A and the upper end portion 31B.
In a state where the shield plate 30 is attached, the outside air holes 113A and 113B face the space between the shield plate 30 and the bottom plate portion 1130. That is, the width dimension in which the outside air holes 113 </ b> A and 113 </ b> B are arranged is shorter than the dimension between the bottom plate portion 1130 and the shield plate 30.

A plurality of vent holes 30 </ b> B are formed in the shield plate 30 at positions facing the audio circuit board 17 and positions facing the IF circuit board 25, respectively, for enhancing the heat dissipation effect. These vent holes 30B are arranged in a plane rectangular shape with a predetermined area so as to correspond to the size of the audio circuit board 17 and the IF circuit board 25, respectively. The shield plate 30 is formed with a concave mounting portion 30 </ b> C corresponding to the supporting protrusion 32.
In the present embodiment, the IF circuit board 25 constitutes a first circuit board, the audio circuit board 17 constitutes a second circuit board, and at least the IF circuit board 25 or the audio circuit board 17 with the shield plate 30 interposed therebetween. The AV circuit board 22 arranged opposite to constitutes a third circuit board. Further, the path from the outside air ports 113A and 113B to the opening 30A through the heat dissipating member 31 forms an outside air ventilation path P.

(Cooling method of flat display device)
Next, a method for cooling the inside of the flat display device 1 according to the present embodiment will be described.
First, the fan 21 is operated. Then, the air inside the housing 10 is sent to the power supply unit 20 by the fan 21, and cooling air is supplied from the outside through the outside air ports 113 </ b> A and 113 </ b> B formed in the housing 10 as the fan 21 operates. Introduced inside. This cooling air is guided through the ventilation path P to the space between the shield plate 30 and the AV circuit board 22. That is, the cooling air that has flowed into the apparatus through the outside air ports 113A and 113B hits the side wall of the heat radiating member 31 and then passes through the opening 30A of the shield plate 30, and thereafter, between the AV circuit board 22 and the shield plate 30. It is sent to space. This cooling air is sent to the fan 21 along the surface of the AV circuit board 22.
Cooling air is also introduced into the housing 10 from the outside air port 113 </ b> A formed at a position that is not near the heat radiating member 31, and the cooling air is sent to the fan 21 after cooling the shield plate 30.
Here, the heat generated in the audio circuit board 17 is stored in the heat radiating member 31 and transmitted to the shield plate 30. This heat is taken away by the cooling air flowing in from the outside air ports 113 </ b> A and 113 </ b> B coming into contact with the heat radiating member 31 and the surface of the shield plate 30.

(Operation effect of flat display device)
(1) A metal shield plate 30 that shields the audio circuit board 17, the tuner circuit board 18, and the IF circuit board 25 housed in the housing 10, and a metal heat dissipation member 31 that radiates heat from the audio circuit board 17. The cooling structure is configured to include the heat dissipation member 31 and the shield plate 30. Therefore, since the shield plate 30 functions as a member that performs electromagnetic shielding and also functions as a heat radiating member, heat can be sufficiently radiated without enlarging the heat radiating member 31 itself. In particular, since the shield plate 30 is formed in a plate shape, the shield plate 30 plays a role of a radiation fin, and a large heat radiation effect can be ensured.
Therefore, since the shield plate 30 can be used effectively when radiating the same amount of heat radiation from the circuit board as in the prior art, the height dimension of the heat radiating member 31 can be kept lower than in the past, and the cooling structure can be reduced. Thinning can be achieved.
Furthermore, the shield plate 30 is a member that has been conventionally required for electromagnetic shielding of the circuit board. By using this conventional member also as a heat radiating member, the number of components can be reduced.

(2) The shield plate 30 shields the IF circuit board 25 and the audio circuit board 17 provided with heat-generating components, and the heat dissipation member 31 is provided on the audio circuit board 17 and joined to the shield board 30. It is a configuration. Therefore, since the heat radiation member 31 is provided on the audio circuit board 17 provided with heat-generating components among a plurality of circuit boards, heat is radiated from the circuit board having a large amount of heat generated through the heat radiation member 31 and the shield plate 30. Can be highly efficient.

(3) Since the AV circuit board 22 is disposed at least at a position facing the IF circuit board 25 or the audio circuit board 17 with the shield board 30 in between, the shield board 30 also serves as a stay for attaching the AV circuit board 22. Therefore, the number of parts can be reduced. Further, since the air flowing out from the opening 30A of the shield plate 30 flows between the shield plate 30 and the AV circuit board 22, this heat can be taken away when heat is generated from the AV circuit board 22. it can.

(4) Outside air ports 113 </ b> A and 113 </ b> B that take in outside air from outside the housing 10 are provided in a part of the housing 10, and an opening 30 </ b> A is formed in the shield plate 30. The heat radiating member 31 is provided in the vicinity of the outside air ports 113A and 113B and the opening 30A. Therefore, since the heat radiating member 31 is disposed in the vicinity of the outside air intake, the cooling air flowing from the outside can be brought into contact with the heat radiating member 31 as it is, and the heat radiating effect can be improved.

(5) The heat radiating member 31 is provided between the outside air ports 113A and 113B and the opening 30A, and the path from the outside air ports 113A and 113B to the opening 30A via the heat radiating member 31 is defined as the outside air ventilation path P. Therefore, when the cooling air passes through the ventilation path P, the heat radiation from the heat radiation member 31 can be efficiently performed.

(6) Since the fan 21 that takes in the outside air into the housing 10 is provided on the side of the ventilation path P facing the outside air ports 113A and 113B, the outside air is forcibly forced by operating the fan 21. Can be imported. Therefore, since the flow of cooling air can be secured, the heat dissipation effect can be enhanced also from this point.

(7) Since a plurality of vent holes 30 </ b> B are formed in the shield plate 30, the heat dissipation effect can be further enhanced by increasing the surface area of the shield plate 30.
(8) Since the shield plate 30 and the heat radiating member 31 are each formed of aluminum, it is possible to reduce the weight of these members and thus the entire apparatus.
(9) Since the flat display device is configured with the cooling structure having the above-described structure, the flat display device 1 can be thinned.

[Modification of Embodiment]
In addition, this invention is not limited to embodiment mentioned above, The deformation | transformation shown below is included in the range which can achieve the objective of this invention.

For example, in the above embodiment, the shield plate 30 and the heat dissipation member 31 are each formed from aluminum. However, in the present invention, one or both of these members are formed from a metal other than aluminum, such as iron or copper. It may be a thing.
Further, the cooling structure of the electronic device is applied to the flat display device. However, the present invention is not limited to this, and the cooling structure of the device having a circuit board that generates heat, such as a CRT display device, an audio device, and other devices. Can be applied to.
Furthermore, in order to further improve the heat dissipation effect of the shield plate 30, a structure in which heat dissipation fins are provided on at least one of the front and back surfaces of the shield plate 30 may be employed.

[Effects of Embodiment]
As described above, in the above-described embodiment, the metal shield plate 30 that shields the audio circuit board 17, the tuner circuit board 18, and the IF circuit board 25 housed in the housing 10, and heat dissipation from the audio circuit board 17. This is a cooling structure for an electronic device including a metal heat radiating member 31, and the heat radiating member 31 and the shield plate 30 are joined. Therefore, since the shield plate 30 functions as a member that performs electromagnetic shielding and also functions as a heat radiating member, heat can be sufficiently radiated without enlarging the heat radiating member 31 itself. Therefore, since the shield plate 30 can be used effectively when radiating the same amount of heat radiation from the circuit board as in the prior art, the height dimension of the heat radiating member 31 can be kept lower than in the past, and the cooling structure can be reduced. Thinning can be achieved.

1 is an exploded perspective view showing a schematic configuration of a flat display device according to an embodiment of the present invention. The perspective view which shows the flat display apparatus of the state which removed the rear cover. The perspective view which shows the board | substrate attaching part of the state in which electronic devices were attached. FIG. 4 is a perspective view showing a state in which the AV circuit board and the like are removed from FIG. 3 and the board attaching portion is attached to the front frame. The perspective view which shows the state which removed the shield board from FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Flat panel display device, 10 ... Housing | casing, 17 ... Audio circuit board (2nd circuit board), 21 ... Fan, 22 ... AV circuit board (3rd circuit board), 25 ... IF circuit board (1st Circuit board), 30 ... shield plate, 30A ... opening, 31 ... heat dissipation member, 113A, 113B ... outside air port, P ... ventilation path

Claims (7)

A cooling structure for an electronic device comprising a metal shield plate that is housed in a housing and shields at least the circuit board, and a metal heat dissipation member that radiates heat from the circuit board,
A cooling structure of an electronic device, wherein the heat dissipation member and the shield plate are joined. In the cooling structure of the electronic device according to claim 1,
The shield plate shields the first circuit board and the second circuit board provided with the heat-generating component, and the heat dissipation member is provided on the second circuit board and joined to the shield board. A cooling structure for electronic equipment. In the cooling structure of the electronic device according to claim 1 or 2,
A cooling structure for an electronic device, wherein a third circuit board is disposed at least at a position facing the first circuit board or the second circuit board with the shield plate interposed therebetween. In the cooling structure of the electronic device in any one of Claims 1-3,
A part of the housing is provided with an outside air inlet for taking in outside air from the outside of the housing, an opening is formed in the shield plate, and the heat radiating member is provided in the outside air port and in the vicinity of the opening. Electronic equipment cooling structure. The electronic device cooling structure according to claim 4,
Cooling of electronic equipment, wherein the heat radiating member is provided between the outside air port and the opening, and a path from the outside air port to the opening through the heat radiating member forms a vent path for the outside air Construction. In the cooling structure of the electronic device according to claim 5,
A cooling structure for an electronic device, wherein a fan for taking the outside air into the housing is provided on a side of the air passage opposite to the outside air port.   A flat display device comprising the electronic device cooling structure according to claim 1.

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