JP3348691B2 - Video display device housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device housing having high heat dissipation, and more particularly, to a case in which a material having a high thermal conductivity is used for an inner housing and an inner housing and an outer housing covering the same are used. The present invention relates to a video display device housing that has a double structure with a housing, is lightweight, and reduces noise.

[0002]

2. Description of the Related Art Hitherto, heat generated by a heat generating portion in an image display apparatus housing has caused deterioration of the performance of the image display apparatus housing, and various techniques have been proposed for heat dissipation methods. For example, JP-A-8-54835 discloses that
A light emitting diode (LED) display that uses a dual structure of an inner housing and an outer housing to discharge the heat radiated to that space, and to reduce the running cost by making the inner housing waterproof and dustproof. An apparatus has been proposed (conventional example 1). FIG. 3 is a sectional view showing an LED display device disclosed in Japanese Patent Application Laid-Open No. 8-54835.

As shown in FIG. 3, in a display device installed on a wall 33 of a building, an outer casing 19 and an inner casing 20 are arranged so that the surfaces thereof are flush with each other. A screen 31 is provided on the surface of the housing 20. An exhaust port 29 is formed at the upper end of the screen 31 and between the outer casing 31 and the inner casing 20, and at the lower end of the screen 31 and between the outer casing 19 and the inner casing 20. Has an intake port 30 formed therein. Thereby, the space between the outer casing 19 and the inner casing 20 is connected to the outside via the exhaust port 29 and the intake port 30, and the inner casing 20 is sealed with the screen 31.

[0004] Cooling fins 21 and 22 made of aluminum are welded to the upper surface, the rear surface, and the left and right side surfaces of the inner housing 20 in parallel to the respective surfaces. Further, a display panel 26 is arranged in the inner housing 20 in parallel with the screen 31, and an LED module 28 in which a number of light emitting diodes (LEDs) 24 are arranged in parallel is mounted on the surface side thereof. The control electric member 2 is provided on the back side inside the inner casing 20.
5, and a plurality of heat circulation fans 32 are provided at predetermined positions of the inner housing 20.

With this configuration, when the apparatus is operated, the heat circulating fan 32 circulates the air inside the inner casing 20, thereby increasing the heat generated by the light emitting diode 24 and the control positive electricity member 25. The temperature of the inside 20 of the inner casing is kept uniform. Further, the heated inner casing 20 dissipates heat to the space between the inner casing 20 and the outer casing 19 and discharges the heat to the outside, thereby forming the inner casing 2.
That is, the temperature rise of 0 is suppressed.

Japanese Patent Application Laid-Open No. Hei 10-221779 discloses a technique of a projection type video display apparatus housing excellent in cooling efficiency of the entire apparatus (prior art 2). According to this technology, the periphery of the light valve element is surrounded by a closed space, and air is circulated in the closed space to radiate or cool the light valve element, which is a heat generating member, and to cool heated air in the closed space. For this purpose, a heat exchange means is provided for flowing air taken in from outside the apparatus main body along the outer surface of the closed space and then discharging the air outside the apparatus main body.

In recent years, the housing of the image display device has been reduced in size and weight, improved in heat dissipation, reduced in noise and provided with a sense of quality.
The use of aluminum or magnesium alloy for the housing is increasing. Therefore, the following technology has been proposed (conventional example 3). FIG. 4 is a cross-sectional view showing a video display device housing of Conventional Example 3.

As shown in FIG. 4, in a video display device in which the inside of a housing 34 made of a material having a high thermal conductivity such as metal is blown by a fan motor 5 to cool a heat-generating component, the image display device is adjacent to the fan motor 5. Lamp 9 with the highest calorific value
Is installed, and a shielding plate 16 is provided beside it. The heat of the lamp 9 is radiated by being transmitted from the shielding plate 16 to the housing 34 by radiation, and is further directly cooled by the outside air blown by the fan motor 5. The housing 34 includes a circuit 13 for controlling the image display of the image display unit 8 and a power supply 10 for supplying power to the image display unit 8 and the circuit 13. Heat generated by the power supply heat-generating component 11 on the power supply 10 is transmitted to the housing 34 via the radiator 12. Further, heat generated by a circuit heat-generating component 14 (for example, a central processing unit: CPU), which is a high heat-generating portion on the circuit 13, is transmitted to the housing 34 via the electric heating material 15. In this way, the heat generated from each heat-generating component is transferred to the housing 34 made of a metal material having good heat conductivity.
In this case, the heat radiation efficiency is improved by improving the heat radiation efficiency, the reliability of the components is increased, and the number of revolutions of the fan motor 5 is reduced to reduce the noise.

[0009]

However, in the devices of the prior arts 1 and 2, although the dustproof effect can be enhanced, the sealed housing covers the heat generating portion inside the device, and the heat radiation by the outside air is indirect. The heat radiation efficiency is lower than the heat radiation directly by the outside air. Further, in order to increase the heat radiation effect of the sealed inner housing, there is a problem that the outer housing requires a large capacity and thus cannot be downsized. Further, further weight reduction and noise reduction are also desired.

Further, according to the technique of the prior art 3, since the heat transfer coefficient of the metal is higher than that of plastic and there is a danger of being burned when touched even at a low temperature, the temperature of the metal housing is 15 ° C. lower than that of plastic. It must be kept low, and the heat dissipation effect does not improve much. As a result, the number of revolutions of the fan motor cannot be reduced so much that the noise level cannot be reduced as expected.

Further, when the thickness of the metal housing is reduced to reduce the weight, the surface stress exceeds the allowable stress in a load test (UL 1950250N steady force test (diameter of 30 mm circle)), causing deformation or cracking. There is a limit in reducing the thickness, and as a result, there is a problem that the weight is only about the same as that of the plastic housing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a video display housing capable of reducing the weight of a video display device housing and further improving heat dissipation and reducing noise. With the goal.

[0013]

According to the present invention, there is provided an image display apparatus housing comprising: a first housing having an air inlet provided on one of opposed side walls and an exhaust port provided on the other side wall; A second housing that is provided inside the first housing via a space, has both side walls opened, and stores an image display; and the first housing and the second housing are connected to each other. A plurality of first connecting members, wherein the first housing and the second housing have a double structure connected by the first connecting member.

Further, the second housing or the first connecting member is formed of a material having a higher thermal conductivity than the first housing.

Further, outside air is blown from the air inlet provided in the first housing into the space between the first housing and the second housing and the inside of the second housing. And a fan for discharging heat to the first and second housings by discharging to the exhaust port.

Still further, the first connecting member may be a plurality of plate-like members, a bent portion formed by bending the second housing, or irregularities processed by drawing the second housing. Department.

Further, the first connecting member may be connected to the first and second housings in parallel with the flow of the outside air blown from the intake port to the exhaust port.

Further, the first connecting member, the first housing and the second housing are connected to each other by welding or caulking. The image display device housing according to the above.

Further, the second housing includes a second connecting member for connecting the second housing and a heat-generating component of a circuit for controlling an image of an image display unit incorporated therein, A third connection member for connecting the image display unit and a heat-generating component of a power supply for supplying power to the circuit, wherein the second and third connection members generate heat generated by each heat-generating component; To the second housing.

In the present invention, the heat generated in the heat generating portion of the device built in the housing is transmitted to the second housing by the second connecting member and the third connecting member. The heat is indirectly dissipated by being transmitted to the first housing by the connecting member. Further, the outside air taken in from the air inlet of the first housing by the fan passes through the inside of the second housing to directly cool the heat-generating components inside the second housing, and the first housing and the second housing are cooled. Since the first housing, the second housing, and the first connecting member are directly cooled by passing the outside air through the space between the housing and the housing, a high heat radiation effect can be obtained.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a video display apparatus housing according to an embodiment of the present invention. FIGS. 1A and 1B show a video display apparatus housing according to a first embodiment of the present invention, wherein FIG. 1A is a longitudinal sectional view, and FIG.

As shown in FIG. 1 (a), the outer first
The housing 2 is provided with an opening so that outside air can enter from one intake port 6 and be discharged to the other exhaust port 7 on opposite side walls. Inside the first housing 2, a second housing 3 connected by a number of plate-shaped connecting members 4 is installed. The connecting member 4 has a high thermal conductivity and is light, for example, using aluminum or magnesium.
It was being formed from a metallic material, the role of the radiating fin. The second housing 3 has an opening on the side wall parallel to the side wall provided with the air inlet 6 and the air outlet 7 of the first housing 2 so that outside air can pass through. Further, at least the second housing 3 among the first housing 2 and the second housing 3 constituting the video display device housing 1 is made of a metal material having a high thermal conductivity similar to that of the connecting member 4. Is formed. The second housing 3 includes a video display unit 8 including a lamp 9 having the largest heat value,
A circuit 13 for controlling the image display of the image display unit 8,
A power supply 10 for supplying power to the video display unit 8 and the circuit 13 is built in. The video display unit 8 is installed at a corner between one of the opened side walls of the second housing 3 and a side wall perpendicular to the side wall, and is located beside the video display unit 8 and is connected to the second housing 3. A fan 5 for blowing outside air is provided between one of the opened side walls 3 and the exhaust port 7 of the first housing. The power supply 1 is diagonal to the image display unit 8 and is provided on the lower surface of the second housing via the radiator 12.
0 is installed, and the power supply heat generating component 11 is arranged thereon. In addition, the second power supply heat-generating component 11
A circuit 13 on which a circuit heating component 14 is mounted
Is installed on the upper surface of the second housing via the heat transfer body 15. Circuit heating components are, for example, central processing units (CPU)
And so on.

Next, the operation of the video display device housing in this embodiment will be described. When the image display device is operated, the heat generated by the power supply heat generating component 11 is dissipated by the radiator 1.
2 to the second housing 3. Also, the heat generated by the circuit heat-generating component 14 is transmitted to the second housing through the heat transfer body 15. Further, the lamp 9 in the video display unit 8
Is transmitted to the second housing 3. The heat generated in each of the built-in heat generating units is transmitted to the second housing 3 so that each heat generating unit is indirectly radiated. In addition, heat transmitted to the second housing 3 by this is transmitted to the first housing 2 through the connecting member 4. Therefore,
The heat of the second housing 3 heated by each heat generating unit is indirectly radiated by being transmitted to the first housing 2.
Further, the outside air blown from the intake port 6 to the exhaust port 7 passes through the inside of the second housing 3 by the fan 5 driven at the same time as the operation of the image display device. 11 and the circuit heating component 14 are directly cooled. Further, the outside air taken in from the air inlet 6 passes through the space between the first housing 2 and the second housing 3 and is discharged from the air outlet 7, thereby heating the second housing 3. The connecting member 4 and the first housing 2 are cooled.

The second casing 3 and the connecting member 4 are made of a material having a high thermal conductivity such as aluminum.
Has almost the same area as the first housing 2, and since the connecting member 4 has a large number of plate shapes, both have a large surface area and a high heat radiation effect. In addition, heat generated in each member is directly cooled by the outside air, and is further indirectly cooled by transmitting the heat to the second housing 3, so that heat radiation efficiency is high. Therefore, the rotation of the fan 5 can be slowed down as compared with the conventional example 3, so that noise can be reduced.

The image display device housing 1 has the first housing 2 and the second housing 3 at positions where the stress is applied most (positions farthest from the neutral axis where the stress is minimum). Since the two-hour moment increases and the plate thickness can be reduced, the weight of the image display device housing 1 can be reduced.

Further, the shape of the connecting member 4 in the present embodiment can be connected in parallel with the flow of air by using a plate-shaped member extending from the intake port 6 to the exhaust port 7.

As described above, since the first housing 2 and the second housing 3 are connected by the plate-shaped connecting member 4, the outside air taken in by the fan 5 flows easily, and the heat radiation effect is increased.

Further, by increasing the area of the connecting member 4, the heat radiation effect of the second housing 3 can be increased.
Further, the amount of heat transmitted to the first housing 2 can be reduced.

Next, a second embodiment of the present invention will be described. FIG. 2 is a side view illustrating the shape of the second housing 3 according to the present embodiment.

The heat dissipation effect of the second housing 3 increases as the surface area increases. Therefore, as shown in FIG. 2, a plurality of uneven portions 17 are formed on the surface of the second housing 3 by subjecting the second housing 3 to drawing. The uneven portion 17 may have any shape such as a columnar shape, but here shows a rectangular parallelepiped shape. This is used as a substitute for the connecting member 4 serving as a radiation fin, and the convex portion of the uneven portion 17 and the first
Is joined by welding or caulking 18.

As a result, the heat dissipating from the side surface of the second housing 3 to the drawn radiating fins is more effective than using the connecting member 4 of the first embodiment. Furthermore, since the structure of the video display device housing 1 is simplified, the manufacturing cost can be reduced.

Next, a third embodiment of the present invention will be described. In the third embodiment, the second housing is processed in the same manner as in the third embodiment. A bent portion formed by bending the second housing is used as a connecting portion and substitutes for a radiation fin. The bent connection portion is joined to the first housing by welding or caulking so as to be parallel to the flow of the outside air from the intake port to the exhaust port, as in the second embodiment. Therefore, the outside air taken in from the intake port by the fan can be quickly blown to the exhaust port.

In the present embodiment, the structure is further simplified and the manufacturing cost can be reduced as compared with the drawn housing used in the second embodiment.

[0034]

As described in detail above, according to the present invention,
Since the first housing and the second housing formed of a material having higher thermal conductivity than the first housing have a double structure in which the first housing and the second housing are connected by a connecting member, the weight of the video display device housing can be reduced. It is possible to obtain high heat dissipation, and it is possible to keep the internal components at a temperature that has a margin with respect to an allowable value. Therefore, it is possible to reduce the noise level by reducing the rotation speed of the fan motor.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view and FIG. 1B is a transverse sectional view showing a video display device housing according to a first embodiment of the present invention.

FIG. 2 is a side view showing a shape of a second housing according to a second embodiment of the present invention.

FIG. 3 shows an LE disclosed in JP-A-8-54835.
It is sectional drawing which shows D display device.

FIG. 4 is a longitudinal sectional view showing a conventional video display device housing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Video display apparatus housing | casing 2; 1st housing | casing 3; 2nd housing | casing 4; Connecting member 5; Fan motor 6; Inlet 7; Power supply heat-generating component 12; heat radiator 13; circuit 14; circuit heat-generating component 15; heat transfer member 16; shielding plate 17; uneven portion 18; welded portion (caulking) 19; Fin 24; Light-emitting diode 25; Control electrode member 26; Display panel 28; LED module 29; Exhaust port 30; Inlet port 31; Screen 32; Heat circulation fan 33; Building wall 34;

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 21/16 G02F 1/13 G02F 1/1335 G09F 9/00

Claims (11)

(57) [Claims] 1. A first housing having an intake port provided on one of the opposed side walls and an exhaust port provided on the other side wall, and both sides provided through a space inside the first housing. A second housing that has an open wall and houses the video display device, and a plurality of first connecting members that connect the first housing and the second housing; The first housing and the second housing are connected by the first connecting member;
An image display device housing having a double structure. 2. The video display device housing according to claim 1, wherein said second housing is formed of a material having higher thermal conductivity than said first housing. 3. A method according to claim 2, wherein the first connecting member connecting the first housing and the second housing is made of a material having a higher thermal conductivity than the first housing. Claim 1 or 2
3. The video display device casing according to 1. 4. An outside air is blown from the air inlet provided in the first housing into the space between the first housing and the second housing and into the second housing. The video display device housing according to any one of claims 1 to 3 , further comprising a fan for discharging heat to the first and second housings by discharging to the exhaust port. 5. The video display device casing according to claim 1, wherein said first connecting member is a plurality of plate-shaped members. 6. The video display device housing according to claim 1, wherein the first connecting member is a bent portion formed by bending the second housing. . 7. The image according to claim 1, wherein the first connecting member is an uneven portion formed by drawing the second housing. Display housing. 8. The apparatus according to claim 5, wherein the first connecting member is connected to the first and second housings in parallel with the flow of the outside air blown from the intake port to the exhaust port. Or the video display device casing according to 6. 9. The method according to claim 1, wherein the first connection member is connected to the first housing and the second housing by welding or caulking. The image display device housing according to the above. 10. The second housing includes a second connecting member that connects the second housing and a heat-generating component of a circuit that controls an image of an image display unit incorporated therein. The video display housing according to any one of claims 1 to 9, wherein the second connection member transmits heat generated by a heat-generating component of the circuit to the second housing. . 11. The second housing for connecting the second housing to a heat-generating component of a power supply that supplies power to the video display unit and the circuit incorporated therein. 10. The device according to claim 1, further comprising a third connecting member, wherein the third connecting member transmits heat generated by a heat-generating component of the power supply to the second housing. Image display housing as described.