JP2006058868A - Plasma display tv - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electronic equipment with which temperature of the equipment felt by a human being is reduced who touches the equipment in which a back section metallic casing is used is reduced, unpleasantness and uneasy feeling are eliminated, noise is lowered by reducing the number of fans and a user does not feel casing temperature rise by heat and does not hear noise. <P>SOLUTION: The electronic equipment is provided with a resin member, which has lower touch feeling temperature than a metallic member on at least a portion of the metallic back section casing. Moreover, the resin member is provided with a section which is fixed to the front section casing by screws, heat radiating holes and a hook section which is fixed to the member onto an external fixture. Furthermore, the resin member are made of a double structure in part with the metallic back section casing. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic device having a metal rear housing, and more particularly to a plasma display television.

  Recent electronic devices, especially plasma display TVs, have increased power consumption due to increased brightness, thinner and smaller devices, improved mounting density, and built-in tuners. It is difficult to ensure the quality of each part if not properly performed. In the conventional plasma display television, as a heat countermeasure, the temperature of various components has been suppressed by discharging the hot air to the outside of the casing by air cooling of the fan or by natural air cooling by heat diffusion to the heat sink. However, from the viewpoint of fan space due to the thinning of the casing in a plasma display television and noise, a heat dissipation structure by natural air cooling that does not use a fan is required.

  However, in the case of natural air cooling, since hot air tends to be trapped inside the housing, the surface temperature of the housing partially rises to around 45 degrees, particularly in the upper part (the ambient temperature is around 25 degrees). If). The plasma display television has a shield structure in which a substrate portion is surrounded by a metal rear case and a metal member as a measure against electromagnetic interference and case radiation.

  In such a metal rear case, the human body comes into contact with the metal heated to around 45 degrees during use (for example, when changing the angle of a plasma display TV placed on a stand having a sieve mechanism, Rotate it on the case), feel hot and uncomfortable, and give you anxiety that the TV is broken.

In addition, it is not related to electronic equipment with a metal rear housing, but it is an optical visual device for viewing images when worn on the head so that internal heat is not easily transmitted to the user's face side. In addition, there has been proposed one in which the rear cabinet is formed of a material having low thermal conductivity such as resin. (For example, see Patent Document 1).
JP-A-11-84310

  Conventionally, the metal rear case has a problem that the tactile temperature is higher than that of the resin. In other words, the current plasma display TV has a heat generation density that increases due to the thinning of the case and the increase in the amount of heat generation. As a result, the upper part of the case reaches about 45 degrees (when the ambient temperature is about 25 degrees). The possibility of feeling uncomfortable and anxious is extremely high.

  17, 18, 19, and 20 show a case structure of a conventional plasma display television. 17 and 18 show a first conventional structure example of a plasma display television. 17 and 18, the plasma display television is composed of a rear metal casing 1, a front casing 2, a panel module 3, a substrate 4, a front glass panel 5, a gasket 6, an internal fitting 7, a heat dissipation hole 8, and a fan 9. ing.

  In the above-mentioned conventional example, in order to prevent the internal heat from being transmitted to the user's face side, it has been proposed that the rear cabinet is formed of a material having low thermal conductivity such as resin. In the display television, as a countermeasure against electromagnetic interference and casing radiation, the front glass panel 5 having the rear metal casing 1 and the mesh film on the back surface around the panel module 3 and the substrate 4 and the inner metal fitting 7 as in the present configuration. An enclosed shield structure is indispensable, and a rear cabinet made of a material having low thermal conductivity such as resin is insufficient to solve the problems of electromagnetic interference and housing radiation.

  Moreover, although the fan 9 for lowering | hanging the housing | casing upper part temperature is attached, the subject of noise, the installation space, and the hot air discharge | emission of the blowing part of a fan still remains. In other words, it is necessary to devise a method for preventing a human hand from touching the metal casing part capable of forming the shield structure and the part where the temperature of the upper part of the casing becomes high.

  19 and 20 show a second conventional structure example of a plasma display television. 19 and 20, the rear metal casing 1, the front casing 2, the panel module 3, the substrate 4, the front glass panel 5, the gasket 6, the internal metal fitting 7, the heat radiation hole 8, and the fan 9. The above is the same as Conventional Example 1. This conventional example is different from the conventional example 1 in that the pile flock 10 is applied to the rear metal casing 1 with an adhesive. With such a configuration, it is possible to prevent the human body from directly touching the metal housing 1 and the air between the hairs acts as a heat insulating layer, so that the metal thickness is not felt. However, design issues or hair stains remain.

  The object of the present invention is to reduce the tactile sensation temperature to the human body of an electronic device using a rear metal casing, to eliminate discomfort and anxiety, and to reduce noise by reducing the number of fans. is there. According to the present invention, it is possible to solve the above-mentioned problems of an electronic device such as a plasma display television having a metal rear case, and to provide an electronic device that does not make the user feel the case temperature rise and noise due to heat. .

  In order to solve the above problems, an electronic device of the present invention is configured to include a resin member having a tactile temperature lower than that of the metal in at least a part of the metal rear housing.

  Further, the resin member includes a screw fixing portion with the front housing, a heat radiating hole, and a hook portion that can be fixed to the external fixture.

  Furthermore, the resin member is configured to partially have a double structure with the metal rear housing.

  According to the present invention, it is possible to reduce the tactile sensation temperature to the human body of an electronic device using a metal rear housing, to eliminate discomfort and anxiety, and to reduce noise by reducing fans, It is possible to provide an electronic device that does not cause the user to feel the case temperature rise and noise due to heat.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
1, 2, and 3 are configuration diagrams of the plasma display television 11 according to Embodiment 1 of the present invention, FIG. 1 is a rear view of the plasma display television, and FIG. 2 is a central sectional view of FIG. 3 is an exploded partial exploded view of the rear housing.

  The rear housing 12 includes a molded resin housing 12a and a metal housing 12b, and is fixed by ultrasonic welding or a joining method such as a screw 13. In order to form a shield structure, the metal part housing 12 b is connected by a front glass panel 15 having a mesh film on the back surface and an internal metal fitting 16 via a gasket 14.

  In FIG. 2, heated air in the plasma display television is accumulated in the upper part of the case by natural convection, and the temperature of the molded resin part case 12 a provided on the upper part of the rear case 12 rises. Is lower than the metal part housing 12b, the tactile sensation temperature is also low, and even if the upper part of the housing reaches about 45 degrees (in the case of an ambient temperature of about 25 degrees), it is not a temperature at which a person feels heat even when touched. .

  In the present invention, for example, a PS resin (prestyrene) having a thermal conductivity of 0.028 W / (m · K) and a heat-resistant temperature of 90 degrees is used for the molded resin portion housing 12a.

(Embodiment 2)
4, 5, and 6 are configuration diagrams of the plasma display television 20 according to Embodiment 2 of the present invention, FIG. 4 is a rear view of the plasma display television, and FIG. 5 is a central sectional view of FIG. 4. 6 is a partially exploded view of the rear housing.

  The rear housing 21 includes a molded resin housing 21a and a metal housing 21b, and is fixed by ultrasonic welding or a joining method such as a screw 13. In order to form a shield structure, the metal part housing 21b is connected via the gasket 22 by the front glass panel 15 having the mesh film on the back surface and the internal metal fitting 23.

  The molded resin portion housing 21a is configured to include a peripheral screw fixing portion 25 with the front housing 24, a heat radiation hole 26, and a hook portion 27 that can be fixed to an external fixture. In addition, the molded resin portion casing 21a needs to have good heat resistance so that the thermal conductivity is lower than that of the metal portion casing 21b and the casing may rise to 45 ° C. In the present invention, for example, PS resin (prestyrene) having a thermal conductivity of 0.028 W / (m · K) and a heat-resistant temperature of 90 degrees is used.

  In FIG. 4, since the outer peripheral screw stopper is formed by narrowing in the case of metal, it is necessary to increase the gradient so that the metal does not break, and the concave shape becomes larger than that of the resin. If the outer periphery screwing part 25 is made into the molded resin part housing | casing 21a, the concave shape of a screwing part will become smaller than metal, and a design freedom will improve. Further, in the case where the heat radiating holes are made of metal, since hole processing is performed after drawing, a separate process for hole processing is required, and the restriction on the hole shape is larger than that of the resin. Further, in order to prevent a fall, a clamp, a screw, and a screw mounting boss are attached to the rear case by caulking so that a fall prevention string can be attached to the rear case. However, by providing the hook portion 27 in the resin portion, all the parts are not required.

(Embodiment 3)
7, 8, 9, and 10 are configuration diagrams showing the configuration of the plasma display television 30 according to Embodiment 3 of the present invention. FIG. 7 is a rear view of the plasma display television, and FIG. FIG. 9 is a central sectional view, and FIG. 10 is a fan sectional view.

  The rear casing 31 includes a molded resin section casing 31a and a metal section casing 31b, and is fixed by a joining method such as ultrasonic welding or screws 13. In order to form a shield structure, the metal part housing 31b is connected by a front glass panel 15 having a mesh film on the back surface and an internal metal fitting 33 via a gasket 32.

  Since the molded resin part housing 31a is installed so as to overlap the metal part housing 31b, the rear housing 31 has a partially double structure. Heated air in the plasma display television is accumulated in the upper part of the case by natural convection, and the temperature of the molded resin part case 31a provided on the upper part of the rear case 31 rises. Therefore, the tactile sensation temperature is lower than those of the first and second embodiments. Further, since the molded resin portion casing 31a can be installed outside the metal portion casing 31b connected to the internal metal fitting 33 through the gasket 32 in order to form a shield structure, the plasma is more effective than the first and second embodiments. The height of the display TV can be reduced, and the compactness is excellent.

  In addition, when the internal component cooling fan 35 as shown in FIG. 10 is used, the heat discharge hole 36 has a double structure by making the fan discharge part 36 on the upper part of the metal part housing 31b full opening. It is possible to avoid a decrease in fan air volume due to an increase in ventilation resistance.

  The material of the molded resin portion housing 31a needs to be a resin having a low thermal conductivity of 1 W / (m · K) or less and a heat resistant temperature of 50 degrees or more (in the case of an ambient temperature of around 25 degrees). . In the present invention, for example, PS resin (prestyrene) having a thermal conductivity of 0.028 W / (m · K) and a heat-resistant temperature of 90 degrees is used. The thickness of the PS resin is 2.5 to 3.0 mm in order to enable resin molding processing.

  In addition, the clearance of the air layer 34 between the molded resin portion casing 31a and the metal portion casing 31b is set to about 1 mm to 5 mm, thereby avoiding heat retention in the air layer, and further, the molded resin portion casing. The gap structure can absorb the torsional deformation due to the thermal deformation of the metal and the press working dimension variation of the metal part housing.

  Furthermore, the point that the molded resin portion housing 31a may be provided with a hook portion that can be fixed to the outer peripheral screw-fastening portion with respect to the front housing, the heat radiating hole, and the external fixture is the same as in the second embodiment. .

  In the present embodiment, the molded resin portion casing 31a is a resin having a thickness of 2.5 to 3.0 mm, but may be a resin sheet material having a thickness of 0.3 to 2.0 mm.

(Embodiment 4)
11, 12, and 13 are configuration diagrams showing the configuration of the plasma display television 40 according to Embodiment 4 of the present invention. FIG. 11 is a rear view of the plasma display television, FIG. 12 is an exploded partial exploded view, and FIG. 13 is a central sectional view.

  The plasma display television 40 includes a front glass panel 15, a gasket 42, an internal metal fitting 43, a heat dissipation hole 44, a fan 45, an air layer 46, a molded resin portion casing 41a, a molded resin portion casing 41b, a metal portion casing 41c, It consists of screws 13.

  The rear housing 41 includes molded resin housings 41a and 41b and a metal housing 41c. The molded resin housing is divided into 41a and 41b. The rear housing 41 is fixed to the front housing by a joining method such as ultrasonic welding or screws 13, and the metal housing 41c has a mesh film on the back surface through a gasket 42 to form a shield structure. The front glass panel 15 and the internal metal fitting 43 are connected.

  The material of the molded resin section housings 41a and 41b must be a resin having a low thermal conductivity of 1 W / (m · K) or less and a heat resistance temperature of 50 degrees or more (in the case of an ambient temperature of around 25 degrees). It is. In the present invention, for example, PS resin (prestyrene) having a thermal conductivity of 0.028 W / (m · K) and a heat-resistant temperature of 90 degrees is used. The thickness of the PS resin is 2.5 to 3.0 mm in order to enable resin molding processing.

  The feature of the shape is that the resin casing is formed on the upper part of the plasma display TV as in the third embodiment, but the metal part casing 41c is reduced by reducing the vertical width with respect to the shapes of the molded resin part casings 41a and 41b. The heat radiation hole portion 44 is not interfered with. This is because, for example, when changing the angle of the plasma display television 40 placed on a stand having a sieve mechanism, the hand is assumed to be put on the metal rear case and rotated from the outer periphery of the case 10 mm to 100 mm. The tactile sensation temperature can be reduced by covering the range with a molded resin part housing having a low thermal conductivity. Further, according to such a configuration, it becomes possible to avoid deterioration of air permeability due to the double structure of the molded resin part housing heat radiation hole part and the metal part housing heat radiation hole part as in the third embodiment. Even when the internal component cooling fan 45 is used, it is possible to avoid the influence of electromagnetic interference due to the metal part housing as in the third embodiment having only the fan discharge part fully opened.

  Moreover, the clearance of the air layer 46 between the molded resin unit housings 41a and 41b and the metal unit housing 41c is set to about 1 mm to 5 mm to avoid heat retention in the air layer. As in the case of the third embodiment, the gap configuration that can absorb the torsional deformation due to the thermal deformation of the casing and the press working size variation of the metal section casing is the same as that of the third embodiment. As a characteristic of the large size, it becomes a long and narrow shape that reaches 1 m or more when the width is set, and it is easy to be deformed by heat. Therefore, the molded resin part housing is divided into 41a and 41b, and between 41a and 42b. If the gap between the molded resin parts that can be formed is 1 mm to 5 mm, the length can be absorbed even if the resin expands due to thermal deformation.

  Furthermore, with respect to the molded resin section housing, it is a large size as a characteristic of the plasma TV, and when it is made wide, it becomes a long and narrow shape that reaches 1 m or more, and the molding machine at the time of molding becomes large, but it is divided into left and right Since the molding machine for molding can be made smaller, there is also a price advantage, and further, the left and right widths are divided and the left and right widths are reduced, so that it can reach 1 m or more when mounting the molded resin part housing This eliminates the difficulty of mounting workability in a horizontally elongated shape, and has an effect of facilitating the mounting work. Further, as shown in FIG. 14, if the cut portions 48 of the molded resin portion casings 47a and 47b are partially cut and the left and right widths are shortened to create for a large size plasma display television, the plasma display television It is possible to support sharing of small size differences. In FIG. 14, although divided into two, dividing into three, four, etc. according to the size and width of the plasma display television can be selected as appropriate, and double-sided tape processing is performed as shown in FIG. Integrated sheet material (thickness of the material is 0.3 mm to 2 mm, low thermal conductivity of 1 W / (m · K) or less, and metal using a resin sheet with a heat resistance of 65 degrees C or more) The same effect can be obtained even if it is attached to the housing.

  In addition, as shown in FIG. 16, by forming the molded resin portion casings 50a and 50b on the left and right sides of the plasma display television 40, for example, when changing the angle of the plasma display television 40 placed on a table having a sieve mechanism, The tactile temperature can be reduced by covering the range of 10 mm to 100 mm from the outer periphery of the housing, which is assumed to be applied when rotating by hanging on the metal rear housing, with a molded resin housing with low thermal conductivity, According to such a configuration, when the plasma display television 40 is used from horizontal installation to vertical installation, the tactile temperature of the outer periphery of the housing can be similarly reduced.

  In this embodiment, the heat countermeasure for the metal housing of the plasma display television is taken as a heat countermeasure for the metal housing of an electronic device such as a tuner device, audio, recording / playback apparatus, or the like.

  The electronic device according to the present invention can reduce the tactile sensation temperature to the human body of the electronic device using the metal rear case, and can eliminate unpleasantness and anxiety, and can reduce noise by reducing the number of fans. The present invention provides an electronic device that does not cause the user to feel the housing temperature rise and noise due to heat, and is useful in the field of electronic devices.

The rear view of the electronic device in Embodiment 1 of this invention Central sectional view of the electronic device according to the first embodiment of the present invention. Assembly partial exploded view of electronic equipment in Embodiment 1 of the present invention The rear view of the electronic device in Embodiment 2 of this invention Central sectional view of an electronic device according to Embodiment 2 of the present invention Assembly partial exploded view of electronic equipment in Embodiment 2 of the present invention The rear view of the electronic device in Embodiment 3 of this invention The assembly partial exploded view of the electronic device in Embodiment 3 of this invention Central sectional view of an electronic device according to Embodiment 3 of the present invention Sectional view of the fan part of the electronic device in Embodiment 4 of this invention The rear view of the electronic device in Embodiment 4 of this invention The assembly partial exploded view of the electronic device in Embodiment 4 of this invention Middle sectional view of electronic equipment in Embodiment 4 of the present invention Molded resin part housing component diagram in embodiment 4 of the present invention Molded resin part housing component diagram in embodiment 4 of the present invention The assembly partial exploded view of the electronic device in Embodiment 4 of this invention Rear view of first conventional example of plasma display television Cross-sectional view of structure of first conventional example of plasma display television Rear view of second conventional example of plasma display television Sectional view of structure of second conventional example of plasma display television

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear metal housing | casing 2 Front housing | casing 3 Panel module 4 Board | substrate 5 Front glass panel 6 Gasket 7 Internal metal fitting 8 Radiation hole 9 Fan 10 Pile flock 11 Electronic equipment 12 Rear housing 13 Screw 14 Gasket 15 Front glass panel 16 Internal metal fitting DESCRIPTION OF SYMBOLS 20 Electronic device 21 Rear housing | casing 22 Gasket 23 Inner metal fitting 24 Front housing | casing 25 Outer periphery screwing part 26 Radiation hole 27 Hook part 30 Electronic equipment 31 Rear housing | casing 32 Gasket 33 Internal metal fitting 34 Air layer 35 Fan 36 Fan discharge part 37 Fully Opening 40 Electronic Equipment 41 Rear Housing 42 Gasket 43 Internal Hardware 44 Heat Dissipation Hole 45 Fan 46 Air Layer 47 Rear Housing 48 Cut Portion 49 Rear Housing 50 Rear Housing

Claims (4)

A display device comprising: a display panel; a front housing mounted on the front surface of the display panel; and a rear housing that covers a back surface of the display panel, wherein the rear housing is heated by a metal part and the metal part. A plasma display television having a resin portion with low conductivity. The plasma display television according to claim 1, wherein the resin portion is located at a part of an outer periphery of the rear housing. The plasma display television according to claim 1, wherein the resin portion is disposed on at least one upper side of the outer periphery of the metal portion to have a double structure. The plasma display television according to claim 3, wherein the plurality of resin portions are arranged on one side of the outer periphery of the metal portion.

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