JP2001326488A - Electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a device small-sized, lightweight, and small in the number of components and to suppress the shortening of the life, etc., due to a temperature rise by accelerating the cooling of a heating element. SOLUTION: This equipment is equipped with a means which generates an air flow in a housing containing the heating element 10 as an electronic equipment component and formed by engaging a front cover 1 and a rear cover with each other and a means which narrows an air flow passage on the internal surface of the housing, covering the heating element 10, where the heating element is arranged; and the means which narrows the air flow passage is provided facing the heating element 10 and a projection part of a member 8 which reinforces the structure of the housing and its shape crosses the air flow passage at right angles. The housing is provided with a lower intake 7 and an upper outlet 9 as parts of the air flow passage and a means which generates an air flow is a fan 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electronic device used as a character or image display device such as a display of a television receiver or a computer, a message board or the like.

[0002]

2. Description of the Related Art In recent years, a color cathode ray tube (CRT) has been widely used as an image display device. However, a driving principle is to deflect an electron beam from a cathode to emit a phosphor on the screen. Depth along with the size was needed. As the screen becomes larger, the depth becomes longer. Therefore, there is a strong demand for a flat type image display device which is thin and can be reduced in weight because of problems such as an increase in installation space and an increase in weight. As examples of the flat-panel image display device, a surface electron emission type display panel (hereinafter abbreviated as SED), a plasma display panel (hereinafter abbreviated as P)
DP), a liquid crystal display device (hereinafter abbreviated as LCD), a field emission display device (hereinafter abbreviated as FED), and a plasma address liquid crystal display device (hereinafter abbreviated as PALC). ) Etc.
JP-A-9-045266, JP-A-05-002370, JP-A-05-158016, JP-A-05-2005
114372, JP-A-05-142523, etc.).

FIG. 15 is a perspective view of a conventional example of a flat-panel image display device, and FIG. 16 is a cross-sectional view taken along the line DD in FIG.

[0004] In the figure, reference numeral 1003 denotes the above-mentioned SED,
An image forming panel using PDP, LCD, FED, or PALC, and 1004, a driving circuit board disposed behind the image forming panel. The image forming panel 1003 and the drive circuit board 1004 are electrically connected by a flexible printed wiring board (not shown). Reference numeral 1010 denotes a heating element mounted on the drive circuit board 1004. The heating element 1010 is, for example, a drive switching device. Reference numeral 1001 denotes a front cover having an opening at a position where an image is formed on the image forming panel, and 1002 denotes a front cover 10
01 is a back cover that encloses the image forming panel 1003 and the drive circuit board 1004 when fitted. The rear cover 1002 includes an image forming panel 1003 and a heating element 10.
There is a lower air inlet 1007 and an upper air outlet 1009 for cooling the air. 1005 is the upper outlet 1009
It is a cooling fan installed in. Reference numeral 1012 denotes a flat-panel image display device obtained by assembling these components.

In order to protect the enclosed image forming panel 1003 and the drive circuit board 1004 from external shocks and vibrations, the rear cover 1002 has a thickness of 3 mm, which is about twice the thickness of the front cover 1001 which is 1.5 mm. By manufacturing in
High rigidity is secured.

The cooling air flowing in the flat panel display 1012 passes through the lower inlet 1007, cools the image forming panel 1003 and the drive circuit board 1004, which are heat-generating components, and is cooled by the cooling fan 1005 from the upper outlet 1009. It flows out of the image display device 1012.

[0007]

In the case of the above-mentioned conventional flat panel display 1012, as shown in FIG. 17, heat generated by an IC or a power supply is provided on a driving circuit board 1004 for driving an image forming panel. The body 1010 exists, and the drive circuit board 1004
The temperature inside was uneven and the temperature was partially high. As a result, runaway and shortening of service life have occurred due to temperature rise near the guaranteed operating temperature of ICs and power supplies. Therefore, it has been necessary to increase the total cooling air flow rate only for a portion that becomes particularly hot. However, there are problems such as an increase in the size of a device for increasing the flow rate of cooling air, an increase in weight, and an increase in cost.

The present invention has been made in view of the above-mentioned conventional problems, and has been made to reduce the size and weight, reduce the number of parts, promote the cooling of a heating element, and suppress the shortening of life due to a rise in temperature. The purpose is to provide equipment.

[0009]

In order to achieve the above object, the present invention relates to an electronic apparatus having a means for generating a gas flow in a housing containing a heating element which is a component of the electronic apparatus. Means for narrowing the gas flow path at the location where the heating element is disposed, and the means for narrowing the gas flow path is provided at a position facing the heating element on the inner surface of the housing covering the heating element. It is characterized by the following. The electronic device may be a flat panel display. The means for narrowing the gas flow path may be a protrusion of a member for reinforcing the structure of the housing. The means for narrowing the gas flow path may set the flow path width ratio to 0.25 to 0.95. The shape of the means for narrowing the gas flow path may intersect at right angles with the gas flow path or may be inclined with respect to the gas flow path. Further, the means for generating the gas flow may be a fan or natural convection utilizing the buoyancy of air. It is preferable that the housing is provided with a lower inlet and an upper outlet which are part of the gas flow path.

It is preferable that the projecting portion of the member for reinforcing the structure of the housing is manufactured by pressing the housing. The parts of the protrusions of the member for reinforcing the structure of the housing may be fixed by screws after being processed by pressing, and the tip of the protrusion of the member for reinforcing the structure of the housing may be It is desirable to have a portion parallel to the gas flow path. The housing is formed by fitting a front cover and a rear cover, and the thickness of the rear cover can be made equal to that of the front cover. The housing is formed by fitting a front cover and a rear cover. It is also possible to make the thickness of the rear cover thinner than that of the front cover. The material of the front cover and the rear cover may be made of a magnesium alloy or may be made of an aluminum alloy.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view of a flat panel display according to an embodiment of the present invention, and FIG.
FIG. 2 is a cross-sectional view of the flat-panel image display device 12 cut at A. In the figure, reference numeral 3 denotes an image forming panel using the above-described SED. FED, LC on the image forming panel 3
D, PDP, and PALC may be used. Reference numeral 4 denotes a drive circuit board disposed behind the image forming panel 3. The image forming panel 3 and the drive circuit board 4 are electrically connected by a flexible printed wiring board (not shown). 10
Is a heating element such as a heating element mounted on the drive circuit board 4. The heating element 10 is, for example, a drive switching device. Reference numeral 1 denotes a front cover having an opening at a position where an image is formed on the image forming panel, and 2 denotes an image forming panel 3 and a driving circuit board 4 which are fitted to the front cover 1.
The back cover encloses the inside. The rear cover has a lower inlet 7 and an upper outlet 9 for air for cooling the image forming panel 3 and the heating element 10. 5 is the upper outlet 9
It is not necessary to use the cooling fan 5 if the operating temperature of the heating element 10 is within the guaranteed operating temperature. Reference numeral 8 denotes a structural reinforcing member provided at a portion of the rear cover 2 below the heating element 10 in the direction of gravity. Reference numeral 12 denotes a flat-panel image display device obtained by assembling these components.

The front cover and the back cover 2 are made of an aluminum alloy or a magnesium alloy in order to protect the enclosed image forming panel 3 and the drive circuit board 4 from external shocks and vibrations. The image forming panel 3 is fixed to a support member (not shown) at four corners by screws (not shown) so as to be sandwiched via a cushioning material (not shown) for protection. The support member (not shown) is made of an aluminum alloy. The drive circuit board 4 performs power supply to the image forming panel 3, switching of selected pixels for displaying an image, signal processing, and the like.

The structural reinforcing member 8 is made of a flat plate of an aluminum alloy or a magnesium alloy. The structural reinforcing member 8 can be pressed even if it is screwed to the portion of the rear cover 2 upstream of the heating element 10 in the cooling air flow. The rear cover 2 may be manufactured by processing. Further, the structural reinforcing member 8 may be partially disposed according to the lateral dimension and the number of the heating elements 10, but the longitudinal end is installed continuously to the side surface when viewed from the screen of the rear cover 2. You may.

The cooling air flowing in the flat image display device 12 flows in from the lower inlet 7, passes through the gas flow path between the rear cover 2 and the image forming panel 3, and passes through the image forming panel 3 which is a heat-generating component. Then, the drive circuit board 4 is cooled and flows out of the flat image display device 12 from the upper outlet 9. The width of the flow path upstream and downstream of the heating element 10 is 80 mm, and the flow path width ratio (flow path width immediately before the heating element 10 / maximum flow rate upstream and downstream of the heating element 10) is provided by the structural reinforcing member 8 immediately before the heating element 10. Road width) is 0.25 to 0.95.

According to the present embodiment, by providing the structural reinforcing member 8 on the rear cover 2, cooling of the heating element is promoted, and shortening of the life due to temperature rise can be suppressed. As a result, the flow rate of the cooling air passing through the flat panel image display device 12 does not need to be secured as compared with the conventional case, and the device can be reduced in size and weight, and the number of components can be reduced.

[0016]

(Embodiment 1) FIG. 1 is an exploded perspective view of a flat-panel image display apparatus according to Embodiment 1 of the present invention, and FIG.
FIG. 2 is a sectional view of the flat-panel image display device 12 cut at A.
FIG. 3 shows the flow of air near the heating element 10.

In FIG. 1, reference numeral 3 denotes an image forming panel using the above-described SED, and reference numeral 4 denotes a drive circuit board disposed behind the image forming panel 3. The image forming panel 3 and the drive circuit board 4 are electrically connected by a flexible printed wiring board (not shown). Reference numeral 10 denotes a heating element such as a heating element mounted on the drive circuit board 4. The heating element 10 is, for example, a drive switching device. Reference numeral 1 denotes a front cover having an opening at a position where an image is formed on the image forming panel. Reference numeral 2 denotes a rear cover that fits with the front cover 1 and encloses the image forming panel 3 and the drive circuit board 4. The rear cover 2 has an image forming panel 3
There is a lower air inlet 7 and an upper air outlet 9 for cooling the air and the heating element 10. 5 is a cooling fan installed at the upper outlet 9. Reference numeral 8 denotes a structural reinforcing member provided at a portion of the rear cover 2 below the heating element 10 in the direction of gravity. Reference numeral 12 denotes a flat-panel image display device obtained by assembling these components.

In order to protect the enclosed image forming panel 3 and the drive circuit board 4 from external shocks and vibrations, the front cover 1 and the rear cover 2 are made of an aluminum alloy, and the thickness of the rear cover 2 is adjusted to the front. High rigidity is secured by manufacturing the cover 1 at 3 mm, which is about twice the thickness of 1.5 mm.

The image forming panel 3 is fixed to a support member (not shown) at four corners by screws (not shown) so as to be sandwiched via a protective cushioning material (not shown). The support member (not shown) is made of an aluminum alloy.

The drive circuit board 4 performs power supply to the image forming panel 3, switching of selected pixels for displaying an image, signal processing, and the like.

The structural reinforcing member 8 is made of a flat plate of an aluminum alloy.
The rear cover 2 is attached to the inner surface of the rear cover 2 as a projection that projects at a substantially right angle. The structural reinforcing member 8 has a thickness of 2
It is manufactured by pressing an aluminum alloy plate of mm. The structural reinforcing member 8 is fixed by being screwed (not shown) to a portion of the rear cover 2 upstream of the heating element 10 in the flow of cooling air. In accordance with the dimensions, the rear cover 2 is partially continuous in the lateral direction at substantially the center in the width direction of the rear cover 2 and in the vicinity thereof.

The cooling air flowing in the flat image display device 12 flows in from the lower inlet 7, passes through the gas flow path between the rear cover 2 and the image forming panel 3, and passes through the image forming panel 3 as a heat-generating component. And the drive circuit board 4 are cooled, and the cooling fan 5 causes the flat image display device 1 to flow through the upper outlet 9.
2 to the outside.

The arrows shown in FIG. 3 indicate the flow of air near the structural reinforcing member 8. The maximum flow path width in the flat image display device 12 upstream and downstream of the heating element 10 is 80 mm. The cooling air flowing from the upstream side of the heating element 10
Immediately before, the flow channel is narrowed to a flow channel width ratio of 0.9 by the structural reinforcing member 8, the flow velocity near the heating element 10 is increased, and the temperature boundary layer portion on the surface of the heating element 10 is thinned. Thereby, the heat transfer coefficient from the heating element 10 to the cooling air can be increased. The structural reinforcing member 8 is installed at right angles to the flow of the cooling air. The size of the channel width ratio by the structural reinforcing member 8 is preferably set in consideration of the pressure loss of the cooling air passing through the flat panel image display device 12 and the heat transfer coefficient of the surface of the heating element 10.

In the present embodiment, the structural reinforcing member 8 is formed on the rear cover 2 so as to suppress the temperature rise of the heating element 10. Therefore, the flow rate of the cooling air passing through the flat panel image display device 12 does not need to be secured as compared with the conventional case, and the number of the cooling fans 5 can be reduced, and the cost can be reduced. Further, since the number of the cooling fans 5 is reduced, the noise of the rotation of the fan motor and the wind noise of the blades of the cooling fan 5 are reduced, and a product with less noise can be obtained.

(Embodiment 2) FIG. 4 is an exploded perspective view of a flat-panel image display device 112 according to a second embodiment of the present invention, and the flat-panel image display device 112 cut along BB in FIG.
5 is shown in FIG. 5, and the flow of air near the heating element 110 is shown in FIG.

In the figure, reference numeral 103 denotes an image forming panel using the above-described SED, and 104 denotes an image forming panel 1.
03 is a drive circuit board arranged behind the circuit board 03. The image forming panel 103 and the drive circuit board 104 are electrically connected by a flexible printed wiring board (not shown). Reference numeral 110 denotes a heating element such as a heating element mounted on the drive circuit board 104. The heating element 110 is, for example, a drive switching device.

Reference numeral 101 denotes a front cover having an opening at a position where an image is formed on the image forming panel, and reference numeral 102 denotes a rear cover that fits with the front cover 101 and encloses the image forming panel 103 and the drive circuit board 104. It is. The rear cover 102 includes an image forming panel 103 and a heating element 1.
There is a lower inlet 107 and an upper outlet 109 of air for cooling the air. 105 is a cooling fan installed at the upper outlet 109. 108 is a heating element 11
This is a structural reinforcing member installed in the portion of the rear cover 102 below the gravity direction from zero. Reference numeral 112 denotes a flat-panel image display device obtained by assembling these components.

In order to protect the enclosed image forming panel 103 and the drive circuit board 104 from external shocks and vibrations,
The front cover 101 and the rear cover 102 are made of an aluminum alloy, and the rear cover 102 has a thickness of 1.5 mm to secure rigidity for product safety.

The image forming panel 103 is fixed to a support member (not shown) at four corners by screws (not shown) so as to be sandwiched via a protective cushioning material (not shown). The support member (not shown) is made of an aluminum alloy.

The drive circuit board 104 is used for the image forming panel 1.
A large number of capacitors, resistors, ICs, etc. are mounted on a substrate made of glass epoxy in order to supply power to the 03, perform switching of selected pixels for projecting an image, and perform signal processing.

The structural reinforcing member 108 is made of an aluminum alloy. In order to enhance the cooling effect of the heating element 110,
It is attached to the rear cover 102. The structural reinforcing member 108 is manufactured by pressing an aluminum alloy plate having a thickness of 2 mm so as to have a substantially parallelogram (see FIG. 5) or trapezoidal (see FIG. 6) cross section. The structural reinforcing member 108 continues in the width direction of the rear cover 102, and its longitudinal end is located at both lateral side positions when viewed from the screen of the rear cover 102, and the longitudinal end of the rear cover 102 is The heating element 110 is fixed by screwing (not shown) to both lateral sides as viewed from the screen.
The tip is located in the vicinity of the edge of the heating element 110 on the upstream side of the gas flow in such a manner as to be inclined and protruded so as to rise as the distance from the heating element 110 increases.

Cooling air generated by natural convection flowing in the flat panel image display device 112 passes through the lower inlet 107, cools the image forming panel 103, which is a heat-generating component, and the drive circuit board 104, and cools the upper outlet. 109 flows out of the flat panel display 112.

The arrows shown in FIG. 6 indicate the flow of air when the structural reinforcing member 108 is provided. The maximum flow path width in the flat image display device 112 upstream and downstream of the heating element 110 is 8
0 mm. The cooling air flowing from the upstream of the heating element 110 is narrowed down to a flow path width ratio of 0.95 by the structural reinforcing member 108 installed immediately upstream of the heating element 110 and upstream of the heating element 110. Then, the flow velocity near the heating element 110 increases, and the temperature boundary layer on the surface of the heating element 110 becomes thin. Thereby, the heat transfer coefficient from the heating element 110 to the cooling air could be increased. It is best that the structural reinforcing member 108 is inclined with respect to the flow of the cooling air. This is because tilting has an effect of suppressing the generation of cooling air at the upstream and downstream portions of the structural reinforcing member 108. The size of the channel width ratio by the structural reinforcing member 108 is preferably set in consideration of the pressure loss of the cooling air passing through the flat panel display 112 and the heat transfer coefficient of the surface of the heating element 110.

By processing and providing the structural reinforcing member 108 on the rear cover 102, the rigidity of the housing composed of the rear cover 102, the front cover 101, and the structural reinforcing member 108 can be increased, and the rigidity can be secured. The same rigidity could be obtained even if the rear cover 102 was made 50 mm thinner by setting the thickness of the rear cover 102 to 1.5 mm. Therefore, the flat-panel image display device 112 is reduced in thickness by about 3%,
% Weight reduction was realized. In addition, the flat-panel image display device 11
In No. 2, since the structural reinforcing member 108 was formed integrally with the rear cover 102, the number of parts could be reduced, and the product could be manufactured as a product with reduced processing costs and manufacturing steps.

(Embodiment 3) FIG. 7 is an exploded perspective view of a flat-panel image display device 212 according to a third embodiment of the present invention, and FIG.
8 is shown in FIG. 8, and the flow of air near the heating element 210 is shown in FIG.

In the figure, reference numeral 203 denotes an image forming panel using the above-described SED, and 204 denotes an image forming panel 2.
03 is a drive circuit board arranged behind the circuit board 03. The image forming panel 203 and the drive circuit board 204 are electrically connected by a flexible printed wiring board (not shown). 210 is a heating element such as a heating element mounted on the drive circuit board 204. The heating element 210 is, for example, a drive switching device.

Reference numeral 201 denotes a front cover having an opening at a position where an image is formed on the image forming panel 203, and 202 denotes a rear cover that fits with the front cover 201 and encloses the image forming panel 203 and the drive circuit board 204. It is. The rear cover 202 has a lower inlet 207 and an upper outlet 209 for air for cooling the image forming panel 203 and the heating element 210. 205 is a cooling fan installed at the upper outlet 209. 208 is a heating element 2
This is a structural reinforcing member installed in a portion of the rear cover 202 that is below the direction of gravity from 10. Reference numeral 212 denotes a flat-panel image display device obtained by assembling these components.

In order to protect the enclosed image forming panel 203 and the drive circuit board 204 from external shocks and vibrations, the front cover 201 and the rear cover 202 are made of an aluminum alloy. 1.5m
m, rigidity for product safety is secured.

The image forming panel 203 is fixed to a support member (not shown) at four corners by screws (not shown) so as to be sandwiched via a protective cushioning material (not shown). The support member (not shown) is made of an aluminum alloy.

The drive circuit board 204 is used for the image forming panel 2
A large number of capacitors, resistors, ICs, and the like are mounted on a substrate made of glass epoxy in order to supply power to the 03, switch a selected pixel for displaying an image, and perform signal processing.

The structural reinforcing member 208 is made of an aluminum alloy. In order to enhance the cooling effect of the heating element 210,
It is provided on the rear cover 202. Also, the structural reinforcing member 2
08 is manufactured by press-working a 2 mm-thick aluminum alloy plate by integral molding, making the cross section into a mountain shape, positioning the top of the mountain shape near the upstream with respect to the heating element 210, and narrowing the air flow path. Attached to the rear cover 202 as described above. The structural reinforcing member 208 has longitudinal ends extending to both lateral sides when viewed from the screen of the rear cover 202, and longitudinal ends to both lateral sides when viewed from the screen of the rear cover 202. It is fixed by screwing (not shown).

Cooling air generated by natural convection flowing in the flat panel display 212 passes through the lower inlet 207, passes through a gas flow path between the rear cover 202 and the image forming panel 203, and generates heat. An image forming panel 20
3 and the drive circuit board 204 are cooled, and the upper outlet 209 is cooled.
Out of the flat-panel image display device 212.

The arrow shown in FIG.
8 shows the flow of air when 8 is provided. Heating element 21
The maximum flow path width in the flat type image display device 212 upstream and downstream of 0 is 80 mm. The cooling air flowing from the upstream side of the heating element 210 is narrowed down to a flow path width ratio of 0.7 by the structural reinforcing member 208 installed upstream of the heating element 210 just before the heating element 210. Then, the flow velocity near the heating element 210 increases, and the temperature boundary layer on the surface of the heating element 210 becomes thin. Thereby, the heat transfer coefficient from the heating element 210 to the cooling air could be increased. Structural reinforcement member 20
8, the size of the flow path width ratio is determined by the flat image display device 21.
It is preferable that the pressure is set in consideration of the pressure loss of the cooling air passing through the inside 2 and the heat transfer coefficient of the surface of the heating element 210.

By processing and providing the structural reinforcing member 208 on the rear cover 202, the rigidity of the housing composed of the rear cover 202, the front cover 201, and the structural reinforcing member 208 can be increased, and the rigidity can be secured. The same rigidity could be obtained even if the rear cover 202 was made to be 1.5 mm thick and made 50% thinner. Therefore, the flat-panel image display device 212 is reduced in thickness by about 3%,
% Weight reduction was realized. Also, this structural reinforcing member 208
Was formed integrally with the rear cover 202, so that the number of parts could be reduced, and a product with reduced processing costs and manufacturing steps could be manufactured.

(Embodiment 4) An apparatus according to Embodiment 4 of the present invention is similar to Embodiment 2 except that only the structural reinforcing member 108 is changed. FIG. 10 shows a partial cross-sectional view of a portion changed from the second embodiment.

In the figure, reference numeral 304 denotes a drive circuit board disposed behind an image forming panel (not shown). Three
Reference numeral 10 denotes a heating element such as a heating element mounted on the drive circuit board 304. The heating element 310 is, for example, a drive switching device. Reference numeral 302 denotes a rear cover that fits with a front cover (not shown) and encloses the image forming panel 303 and the drive circuit board 304. 308 is
The structural reinforcing member is provided on the rear cover 302 in the direction of gravity below the heating element 310 so as to face the drive circuit board 304.

In order to protect the enclosed image forming panel 303 and the driving circuit board 304 from external shocks and vibrations, the front cover 301 and the rear cover 302 are made of an aluminum alloy. 1.5m
m to ensure rigidity for product safety.

The structural reinforcing member 308 is made of an aluminum alloy, and is attached to the rear cover 302 to enhance the cooling effect of the heating element 310. The structural reinforcing member 308 is manufactured by pressing a 2 mm-thick aluminum alloy plate so as to have a mountain-shaped cross section. The structural reinforcing member 308 has a top portion having a chevron cross section disposed near the upstream portion of the heating element 310 in the cooling air flow, and is screwed to both lateral side surfaces when the longitudinal ends are viewed from the screen of the rear cover 302. (Not shown). As a result, the structural reinforcing member 3
08 restricts the flow path of the cooling air and increases the flow velocity near the heating element 310. Then, due to the increase in the flow velocity, the temperature boundary layer on the surface of the heating element 310 was thinned, and the heat transfer with the cooling air was improved.

The arrow shown in FIG.
2 shows the flow of air when the air conditioner is provided. Heating element 310
The maximum flow path width in the flat image display device 112 on the upstream and downstream sides is 80 mm. The cooling air flowing from the upstream of the heating element 310 is narrowed down to a flow path width ratio of 0.6 by the structural reinforcing member 308 immediately before the heating element 310,
The flow velocity near the heating element 310 increases, and the temperature boundary layer on the surface of the heating element 310 is thinned. Thereby, the heating element 31
The heat transfer coefficient from 0 to the cooling air can be increased. The size of the channel width ratio by the structural reinforcing member 308 is preferably set in consideration of the pressure loss of the cooling air passing through the flat panel display 112 and the heat transfer coefficient of the surface of the heating element 310.

By fixing the structural reinforcing member 308 to the rear cover 302, the rigidity of the housing composed of the rear cover 302, the front cover (not shown), and the structural reinforcing member 308 can be increased, and the rigidity can be increased. The same rigidity could be obtained even if the thickness of the rear cover 302 that was secured was made 50% thinner. Therefore, the flat-panel image display device can be reduced in thickness by about 3% and reduced in weight by about 6%.
In addition, since the structural reinforcing member 308 and the rear cover 302 are separate components, the cost for molding can be reduced.

As described above, a thin, lightweight, and inexpensive flat-type image display device can be manufactured.

(Embodiment 5) A flat panel display according to Embodiment 5 of the present invention is the same as Embodiment 2 except that only the structural reinforcing member 108 is changed. FIG. 11 shows a partial cross-sectional view of a portion changed from the second embodiment.

In the drawing, reference numeral 404 denotes a drive circuit board disposed behind an image forming panel (not shown). 4
Reference numeral 10 denotes a heating element mounted on the drive circuit board 404. The heating element 410 is, for example, a drive switching device. Reference numeral 402 denotes a rear cover that fits with a front cover (not shown) and encloses the image forming panel 403 and the drive circuit board 404. 408 is a drive circuit board 4
It is a structural reinforcing member installed on a portion of the rear cover 402 below the heat generating element 410 in the direction of gravity so as to face the element 04.

In order to protect the enclosed image forming panel 403 and the drive circuit board 404 from external shocks and vibrations,
The front cover 401 and the rear cover 402 are made of an aluminum alloy, and the thickness of the rear cover 402 is 1.5 mm to secure rigidity for product safety.

The structural reinforcing member 408 is made of an aluminum alloy, and is attached to the rear cover 402 to enhance the cooling effect of the heating element 410. This structural reinforcing member 4
08 is manufactured by pressing an aluminum alloy plate having a thickness of 2 mm so as to have a portion 413 parallel to the gas flow path at the top of the mountain cross section. Also,
The structural reinforcing member 408 is provided in the cooling air flow to
10, the longitudinal end of the rear cover 402
4 is fixed by screwing (not shown) on both lateral sides when viewed from the screen, and a portion 4 parallel to the gas flow path.
13 is located so as to face the edge of the heating element 410 on the upstream side of the cooling air.

The arrow shown in FIG.
2 shows the flow of air when the air conditioner is provided. Heating element 410
The maximum flow path width in the flat image display device 112 on the upstream and downstream sides is 80 mm. The cooling air flowing from the upstream side of the heating element 410 is narrowed down to a flow path width ratio of 0.4 by the structural reinforcing member 408 immediately before the heating element 410,
The flow velocity near the heating element 410 increases, and the temperature boundary layer on the surface of the heating element 410 is thinned. Thereby, the heating element 41
The heat transfer coefficient from 0 to the cooling air can be increased. By providing parallel portions 413 along the flow of the cooling air in the structural reinforcing member 408, the flow path was restricted in a longer flow section, and the flow velocity near the heating element 410 was increased. As the flow velocity increased, the temperature boundary layer on the surface of the heating element 410 became thinner, and heat transfer with cooling air in a longer section was improved.

The size of the flow path width ratio by the structural reinforcing member 408 is preferably set in consideration of the pressure loss of the cooling air passing through the flat panel display 112 and the heat transfer coefficient of the surface of the heating element 410. .

By processing the structural reinforcing member 408 into the rear cover 402, the rear cover 402 and the front cover 40 are formed.
1, and the rigidity of the housing composed of the structural reinforcing member 408 can be increased, and the same rigidity can be obtained even if the thickness of the rear cover 402, which has secured the rigidity, is reduced by 50%. did it. Therefore, the flat panel display 1
About 12% thinner and about 6% lighter than 12 were realized.
In addition, since the structural reinforcing member 408 and the rear cover 402 are separate components, the cost for molding can be reduced.

As described above, this flat-panel image display device can be made thin, lightweight, and inexpensive.

(Embodiment 6) An apparatus according to Embodiment 6 of the present invention has a structural reinforcing member 108 in the same form as Embodiment 2.
Only the part is changed. FIG. 12 shows a partial cross-sectional view of a portion changed from the second embodiment.

In the figure, reference numeral 504 denotes a drive circuit board disposed behind an image forming panel (not shown). 5
Reference numeral 10 denotes a heating element such as a heating element mounted on the drive circuit board 504. The heating element 510 is, for example, a drive switching device. Reference numeral 502 denotes a rear cover that fits with a front cover (not shown) and encloses the image forming panel 503 and the drive circuit board 504. 508 is
The structural reinforcing member is provided on the rear cover 502 in the direction of gravity from the heating element 510 so as to face the drive circuit board 504.

In order to protect the enclosed image forming panel 503 and the drive circuit board 504 from external shocks and vibrations,
The front cover 501 and the rear cover 502 are made of an aluminum alloy, and the thickness of the rear cover 502 is 1.5 mm to secure rigidity for product safety.

The structural reinforcing member 508 is integrally formed at the same time as the rear cover 502 is formed by press working in order to enhance the cooling effect of the heating element 510. Further, the structural reinforcing member 508 continues in the width direction of the rear cover 502,
The ends in the longitudinal direction are at both lateral side positions when viewed from the screen of the rear cover 502. Further, the structural reinforcing member 508 is formed at a portion upstream of the heating element 510 in the cooling air flow. The structural reinforcing member 508 has a portion 513 parallel to the gas flow path along the flow of the cooling air, thereby restricting the flow path in a longer flow section and increasing the flow velocity of the cooling air near the heating element 510. Due to the increase in the flow velocity, the temperature boundary layer on the surface of the heating element 510 is thinned, and the heat transfer with the cooling air is improved.

The arrow in FIG.
8 shows the flow of air when 8 is provided. Heating element 51
The maximum flow path width in the flat type image display device 112 upstream and downstream of 0 is 80 mm. The cooling air flowing from the upstream of the heating element 510 is supplied to the structural reinforcing member 508 immediately before the heating element 510.
By narrowing the flow path to a flow path width ratio of 0.5, the flow velocity near the heating element 510 increases, and the temperature boundary layer portion on the surface of the heating element 510 is thinned. Thereby, the heat transfer coefficient from the heating element 510 to the cooling air can be increased. By providing the structural reinforcement member 508 with a portion 513 parallel to the gas flow path along the flow of the cooling air, the flow path was restricted in a longer flow section, and the flow velocity of the cooling air near the heating element 510 was increased. As the flow velocity increased, the temperature boundary layer on the surface of the heating element 510 became thinner, and heat transfer with cooling air in a longer section was improved.

The size of the flow path width ratio by the structural reinforcing member 508 is preferably set in consideration of the pressure loss of the cooling air passing through the flat panel display 112 and the heat transfer coefficient on the surface of the heating element 510. .

By fixing the structural reinforcing member 508 to the rear cover 502, the rigidity of the housing composed of the rear cover 502, the front cover (not shown), and the structural reinforcing member 508 can be increased. Similar rigidity could be obtained even if the thickness of the rear cover 502, which was secured, was made 50% thinner. Therefore, the flat-panel image display device 112 was able to be reduced in thickness by about 3% and reduced in weight by about 6%. Further, since the structural reinforcing member 508 is formed integrally with the rear cover 502, the number of components can be reduced, and the processing cost and the manufacturing process can be reduced.

From the above, the flat-panel image display device is
The product was thin, lightweight, and inexpensive.

(Embodiment 7) An apparatus according to Embodiment 7 of the present invention is similar to Embodiment 2 except that only the structural reinforcing member is changed. FIG. 13 is an exploded perspective view of the flat-panel image display device according to the present embodiment, and FIG. 14 is a partial cross-sectional view of a portion changed from the second embodiment.

In the drawing, reference numeral 603 denotes an image forming panel using the above-described SED, and 604 denotes a drive circuit board disposed behind the image forming panel. The image forming panel 603 and the drive circuit board 604 are electrically connected by a flexible printed wiring board (not shown). 61
Numeral 0 denotes a heating element such as a heating element mounted on the drive circuit board 604. The heating element 610 is, for example, a drive switching device. Reference numeral 601 denotes a front cover having an opening at a position where an image is formed on the image forming panel;
The image forming panel 60 is fitted with the front cover 601.
3 and a rear cover for enclosing the drive circuit board 604. The lower cover 602 has a lower air inlet 607 for cooling the image forming panel 603 and the heating element 610.
And an upper outlet 609 and a vent 611. 608
Is a structural reinforcing member installed at a portion of the rear cover 602 below the heating element 610 in the direction of gravity. Reference numeral 612 denotes a flat-panel image display device obtained by assembling these components.

In order to protect the enclosed image forming panel 603 and the drive circuit board 604 from external shocks and vibrations, the front cover 601 and the rear cover 602 are made of an aluminum alloy. 1.5m
m to ensure rigidity for product safety.

The image forming panel 603 is fixed to a support member (not shown) at four corners by screws (not shown) so as to be sandwiched via a cushioning material (not shown) for protection. The support member (not shown) is made of an aluminum alloy.

The drive circuit board 604 is mounted on the image forming panel 6.
A large number of capacitors, resistors, ICs, etc. are mounted on a substrate made of glass epoxy in order to supply power to the 03, perform switching of selected pixels for projecting an image, and perform signal processing.

The structural reinforcing member 608 is made of an aluminum alloy, and is attached to the rear cover 602 to increase the cooling effect of the heating element 610. This structural reinforcing member 608 is formed by pressing an aluminum alloy plate having a thickness of 2 mm to form a cross section of a parallelogram (see FIG. 14).
It is manufactured to be. The structural reinforcing member 60
8 is fixed to the heating element 610 by screwing (not shown) the ends in the longitudinal direction to both lateral sides when viewed from the screen of the rear cover 602, in the upstream portion of the heating element 610 in the cooling air flow. The tip is located in the vicinity of the end of the heating element 610 on the upstream side of the gas flow so as to be inclined and protruded so as to rise as approaching. In addition, a ventilation port 611 through which low-temperature air outside the housing flows is provided in a portion of the rear cover 602 5 mm above the structural reinforcing member 608 in order to promote heat radiation of the heating element 610.

The arrow shown in FIG.
2 shows the flow of air when the air conditioner is provided. Heating element 610
The maximum flow path width in the flat image display device 112 on the upstream and downstream sides is 80 mm. The flow rate of the cooling air flowing from the upstream of the heating element 610 is increased near the heating element 610 by narrowing the flow path to a flow path width ratio of 0.25 by the structural reinforcing member 308 immediately before the heating element 610. The temperature boundary layer on the surface of the heating element 610 is thinned. Thereby, the heat transfer coefficient from the heating element 610 to the cooling air can be increased. Further, the provision of the ventilation port 611 allows low-temperature air to flow in, mixes with warm air in the flat panel display, and lowers the temperature of the entire air. This improves the heat transfer coefficient between the heating element 610 and air,
The heat radiation of the heating element 610 could be improved.

It is best that the structural reinforcing member 608 is inclined with respect to the flow of the cooling air. This is because tilting has the effect of suppressing the generation of cooling air stagnation upstream of the structural reinforcing member 608. However, the structural reinforcing member 608 may be perpendicular to the flow of the cooling air. The size of the channel width ratio by the structural reinforcing member 608 is preferably set in consideration of the pressure loss of the cooling air passing through the flat panel display and the heat transfer coefficient of the surface of the heating element 610.

The apparatus according to the present embodiment includes a structural reinforcing member 60.
8 is fixed to the rear cover 602, the rigidity of the housing composed of the rear cover 602, the front cover 601, and the structural reinforcing member 608 can be increased, and the thickness of the rear cover 602 that has secured the rigidity can be increased. Similar rigidity could be obtained even when the thickness was reduced by 50%. Therefore, the flat-panel image display device can be reduced in thickness by about 3% and reduced in weight by about 6%. Further, in the flat-panel image display device, it is not necessary to secure a flow rate of the cooling air passing through the flat-type image display device than in the related art, and heat radiation can be sufficiently performed without attaching a cooling fan. Therefore, the noise of the rotation of the fan motor and the noise of the wind of the fan blades cannot be heard, so that the product can be manufactured with very little noise and the cost can be reduced.

From the above, the flat-panel image display device is
The product was thin, lightweight, and inexpensive.

[0078]

According to the present invention, in a flat panel display, a structural reinforcing member is provided on a rear cover to reduce the size and weight of the device, reduce the number of parts, and promote cooling of a heating element. Runaway and shortening of life due to temperature rise could be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a flat panel display according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the flat-panel image display device cut along AA in FIG. 1;

FIG. 3 is a conceptual diagram of a partial cross section and an air flow of the flat panel display according to the first embodiment of the present invention.

FIG. 4 is an exploded perspective view showing a flat panel display according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of the flat-panel image display device cut along BB in FIG. 4;

FIG. 6 is a conceptual diagram illustrating a partial cross section and an air flow of a flat panel display according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a flat panel display according to a third embodiment of the present invention.

8 is a vertical sectional view of the flat-panel image display device cut along CC in FIG. 7;

FIG. 9 is a conceptual diagram of a partial cross section and air flow of a flat panel display according to a third embodiment of the present invention.

FIG. 10 is a conceptual diagram illustrating a partial cross section and an air flow of a flat panel display according to a fourth embodiment of the present invention.

FIG. 11 is a conceptual diagram illustrating a partial cross section and air flow of a flat panel display according to a fifth embodiment of the present invention.

FIG. 12 is a conceptual diagram of a partial cross section and air flow of a flat panel display according to a sixth embodiment of the present invention.

FIG. 13 is an exploded perspective view of a flat panel display according to a seventh embodiment of the present invention.

14 is a conceptual diagram of a partial cross section and air flow of the flat panel display shown in FIG. 13;

FIG. 15 is an exploded perspective view of a conventional flat panel display.

FIG. 16 is a longitudinal sectional view of the flat-panel image display device cut along a line DD in FIG. 15;

FIG. 17 is a conceptual diagram of a partial cross section and a flow of air of a conventional flat panel display.

[Explanation of symbols]

1,101,201,301,401,501,60
1,1001: front cover, 2,102,202,30
2,402,502,602,1002: Back cover,
3, 103, 203, 603, 1003: image forming panel, 4, 104, 204, 304, 404, 504, 6
04, 1004: drive circuit board, 5, 105, 100
5: cooling fan, 7, 107, 207, 607, 100
7: Lower inlet, 8, 108, 208, 308, 40
8,508,608: Structural reinforcement member, 9,109,20
9,609,1009: Upper outlet, 10,110,2
10, 310, 410, 510, 610, 1010: heating element, 12, 112, 212, 1012: flat panel display, 413, 513: parallel part.

Claims (16)

[Claims] 1. An electronic device having a means for generating a gas flow in a housing containing a heating element which is an electronic device component, wherein the means for narrowing a gas flow path on the inner surface of the housing at a location where the heating element is disposed. Wherein the means for narrowing the gas flow path is provided at a position facing the heating element on the inner surface of the housing covering the heating element. 2. The electronic device according to claim 1, wherein the electronic device is a flat panel display. 3. The electronic device according to claim 1, wherein the means for narrowing the gas flow path is a protrusion of a member for reinforcing a structure of the housing. 4. The electronic device according to claim 1, wherein the means for narrowing the gas flow path has a flow path width ratio of 0.25 to 0.95. 5. The gas flow path according to claim 1, wherein the shape of the means for narrowing the gas flow path intersects the gas flow path at right angles.
5. The electronic device according to any one of 4. 6. The electronic apparatus according to claim 1, wherein the shape of the means for narrowing the gas flow path is inclined with respect to the gas flow path. 7. The electronic device according to claim 1, wherein the means for generating the gas flow is a fan. 8. The electronic device according to claim 1, wherein the means for generating the gas flow is natural convection utilizing buoyancy of air. 9. The electronic device according to claim 1, wherein the housing is provided with a lower inlet and an upper outlet which are part of the gas flow path. . 10. The electronic device according to claim 1, wherein a projecting portion of a member for reinforcing a structure of the housing is manufactured by pressing the housing. 11. The component according to claim 1, wherein a part of a projecting portion of a member for reinforcing the structure of the housing is processed by pressing, and then fixed by screwing. Electronic equipment. 12. The electronic device according to claim 1, wherein a tip of a protrusion of a member for reinforcing the structure of the housing has a portion parallel to the gas flow path. . 13. The housing according to claim 1, wherein the housing is formed by fitting a front cover and a rear cover, and the thickness of the rear cover is equal to that of the front cover. Electronic equipment. 14. The housing according to claim 1, wherein the housing is formed by fitting a front cover and a rear cover, and the thickness of the rear cover is smaller than that of the front cover. Electronic equipment. 15. The material of the front cover and the rear cover is made of a magnesium alloy.
15. The electronic device according to 3 or 14. 16. A material according to claim 1, wherein said front cover and said rear cover are made of an aluminum alloy.
15. The electronic device according to 3 or 14.