JPH11340639A - Cabinet for electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely recycle a metal cabinet without generating harmful material by forming unevenness on the outer surface of a cabinet formed through a injection-molding metal material having a specific gravity lower than or equal to a specified value such as resin material and Mg alloy, and making the height difference at least a specified value. SOLUTION: When a closed-end vessel type rear cabinet 32 is isolated from a front plate 31, a cabinet 30 is constituted by injection-molding metal material which is Mg alloy having specific gravity lower than or equal to 2. An infrared- ray absorbing function coating film is formed on the inner surface side out of the surface of the cabinet 30. Also on the outer surface side of the cabinet 30, silicon-based coating material in which about 10 W% of photocatalyst particles of titanium dioxide and about 10 W% of photostorage material are mixed is sprayed, and for improving radiation efficiency, unevenness is formed. Height difference of the unevenness is made at least 0.7 μm. As a result, the cabinet 30 can be safely recycled without generating harmful material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cabinet of an electronic device having at least one of a heat radiation function, a photocatalytic function, a light storage function, and an infrared absorption function or a combination thereof.

[0002]

2. Description of the Related Art Generally, an electronic device such as a television receiver has a front plate having a CRT mounted at a central portion thereof,
A rear housing is provided to be attached to the front plate and accommodates a control circuit unit, a speaker device, and the like.

[0003] FIG. 3 is a sectional view of a main part of a housing (cabinet) of a conventional television receiver. FIG.
In, the housing 830 is made of PS (polystyrene) or A
The front and rear parts 831 and the rear housing (back cover) 832 are formed by injection molding a synthetic resin such as BS (acrylonitrile butadiene styrene). The front plate 831 is a CRT (cathode ray tube / CRT) 8
33 are fixedly attached via bosses 834 provided at four places and metal ears 838. An opening is provided on the viewer side corresponding to the CRT 833. Further, the front plate 831 is provided with a speaker device 17 on the funnel surface side of the CRT 833, or provided with the speaker sound emission holes 16 at predetermined positions on the viewer side or on both side surfaces as necessary.
(See FIG. 5) The rear cabinet 832 is fitted to the front plate 831 and integrated by means such as screw fastening. In addition, the control circuit section and C
Radiation holes for releasing heat from the RT
It is arranged on the back, side, bottom, etc. (Not shown) When the size of the CRT is 28 inches to 32 inches, the thickness T of the main surface constituting the front plate and the back cover is set to about 2.3 mm to 3 mm, respectively.

As a matter of course, the television receiver has a built-in control circuit for receiving and controlling radio waves to project an image on the CRT screen. FIG. 4 shows a conceptual diagram of the configuration of the control circuit unit. In this case, the circuit configuration is roughly divided into five blocks (an audio signal amplifier circuit, a video signal amplifier circuit, a color circuit, a synchronous deflection circuit, and a power supply circuit).

As a cooling means for electronic devices such as a television receiver using a CRT, a plasma display (see FIG. 11), and a portable information terminal (for example, a notebook personal computer having a liquid crystal display, see FIG. 2). For example, Japanese Patent Application Laid-Open No. Hei 7-142886 proposes a configuration in which a heat generating member and a metal housing wall as a heat radiating part are thermally connected by a heat transport device having a flexible structure.

Further, Japanese Patent Application Laid-Open No. 7-212684 proposes a plasma display device in which a control circuit board and a housing are connected by a metal having good heat conductivity.

[0007]

However, the above-mentioned conventional housing for a television receiver has the following problems. 1) A case in which a resin member is injection-molded has poor heat conduction and requires a large number of heat radiation holes. In addition, a casing obtained by injection-molding a metal member such as AL or a magnesium alloy also has a high reflectance of radiation when the ground surface has a whitish luster. That is, compared with the case where the surface of the housing is black or the like, the absorption of infrared rays is poor and the heat radiation effect is small. 2) When a heat radiating hole is formed in the rear housing or the like, dust and moisture enter from the heat radiating hole due to long-term use, and dust is deposited on the control circuit portion. The cotton dust absorbs moisture, which may cause a short circuit or failure of the control circuit. 3) When the housing is injection-molded with a metal member, generally, casting using pig iron, die casting (symbol ADC, ZDC) using AL or Zn, lost wax, or the like is used. However, when a large-sized television receiver casing is formed by these methods, the thickness of the casing is at least as large as about 2 mm to 5 mm due to rigidity. The specific gravity of pig iron and ZDC is about 6 to 8, and the specific gravity of ADC is about 2.6 or more. The weight of the housing is large, and it is more practical than the resin housing in terms of transportation and installation. It was not realistic. Therefore, a housing configured to have a thin plate thickness of about 1 mm to 2 mm by a conventional method such as ADC or ZDC has been applied only when the external dimensions are as small as several tens mm to 100 mm square. That is, no idea has been proposed in which a large casing such as a 14-inch or larger stationary television receiver is formed by metal injection molding. 4) The structure of the method of conducting heat conduction between the heat generating member and the housing wall using a flexible structure heat transport device or metal becomes complicated.
This requires members and a mounting space, which is an obstacle to miniaturization of the apparatus. 5) There has not been proposed a configuration having a photocatalytic function or a light storing function on the surface of the housing in addition to the heat radiating function of the uneven film.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides: (1) an improved heat radiation rate on the outer surface of a housing formed by injection molding a metal member such as a resin member or an Mg alloy; The unevenness (or unevenness film) to be formed was formed. The height difference of the irregularities is 0.7 μm
The configuration is as described above.

As the means for forming the unevenness, any one of sandblasting, honing, embossing, organic coating, and suede coating is applied. As the organic coating film, for example, epoxy-based,
Any paint such as urethane, acrylic, silicon, and fluorine may be used. The color of the film is preferably black, but may be another color such as white. Coating thickness is 0.1
It was about 20 μm to 20 μm.

[0010] The suede coating is a surface treatment for forming irregularities on the surface by applying a paint containing about 10% of a particulate member or a flake-like member having a diameter of about 5 to 40 µm. For example, Varnished U-2 (manufactured by Yukosha Co., Ltd.) Etc. may be used. As the particle member, a bulk or hollow member (balloon) made of a metal member, a resin member, a ceramic member, a glass member, or the like.
May be any one or a combination thereof.

[0011] Thermal radiation is a phenomenon in which a part of thermal energy generated by the movement of molecules in a high-temperature object becomes radiant energy and travels through space in the form of electromagnetic waves. Therefore, energy is emitted from all objects having thermal energy. The energy Q [W / m] radiated per unit time from the unit area of the object surface is given by the following equation: Q = ε · σ · (T)
It is represented by Here, ε: emissivity (0 <ε <
1) σ: Boltzmann's constant 5.67 × 10 [W / m · K] T: Absolute temperature of the object [K] Emissivity ε is extremely close to 0 on a mirror surface with a remarkable metallic luster, and conversely, an inorganic material such as an oxidized surface It takes a value close to 1 for organic substances such as paint, paint, and paint. The object that has emitted the radiant energy is cooled. For example, in a mirror-finished Al plate having gloss, ε is 0.05 to 0.1, and infrared rays as heat rays,
It hardly absorbs or emits far-infrared rays. For this reason, there is almost no heat radiation from the surface of the housing using the mirror-finished Al plate with gloss, and the cooling effect is small.

However, when an inorganic film such as alumite treatment is formed on the surface of the Al plate or an organic film is formed by means such as painting, the emissivity can be increased to 0.7 or more.
The cooling effect by the heat radiation from the plate surface increases. Among radiations, infrared rays have a strong effect of exciting thermal motion in an object to increase the temperature. Infrared light has a wavelength of 0.7-30μ
m, and when the surface of the object is a mirror surface, it is almost reflected,
If the surface has irregularities larger than infrared rays, mutual reflection occurs and the reflectance decreases. For this reason, in order to increase the emissivity of the object, it is effective not only to consider the characteristics of the material itself but also to roughen the surface to the wavelength of infrared rays or more.
This is effective in roughening the metal plate itself, but it is more effective to form an inorganic film or an organic film having a higher roughness. Irregularities of several μm to several hundred μm can be formed by a coating process, a sandblasting process, or the like, thereby promoting heat radiation. This also means that heat radiation is promoted by forming irregularities of 0.7 μm or more on the surface of the resin housing.

(2) The present invention provides a structure in which thermally conductive particles having excellent thermal conductivity are mixed in a coating film (such as a silicone resin or a fluorine-based resin) of several W% to several tens W%. did. (W%: wt%) This is to promote heat radiation by heat transfer of the good heat conductor.

As the thermal conductor, any one of copper, silver, alumina, graphite (highly crystalline graphite), carbon and the like or a combination thereof is used. The thermal conductor is in the form of particles, fibers, or flakes, or a combination thereof. As a matter of course, it is desirable that the thermal conductor be uniformly dispersed in the resin,
The outer dimensions of the thermal conductor were in the range of several μm to 40 μm.

(3) The present invention also relates to a method of using a photocatalyst particle having an outer dimension of several μm to several tens μm alone in a coating film (in a coating resin) such as a silicone resin or a fluorine-based resin by several W% to 2%.
About 0 W% was mixed. Further, in addition to the thermal conductor in the above (2), photocatalyst particles having an outer dimension of about 0.001 μm to several μm are mixed in about several W% to 10 W%.

The photocatalyst may use an optional member. For example, fine powder particles of a photocatalyst made of titanium dioxide or a mixture of titanium dioxide and activated carbon were used. By arranging powder particles of the photocatalyst or a thin film of the coating material (adhesive / vehicle / carrier) containing the photocatalyst on the surface of the housing, unevenness having a height difference of at least about 0.7 μm to 30 μm is formed, and heat is radiated. Facilitate. In addition, the photocatalyst exposed on the surface of the coating film or in the coating film prevents dirt on the housing surface, kills bacteria on the surface, and removes the attached odor. In other words, a photocatalyst such as the sun or a fluorescent lamp that receives near-ultraviolet light of 300 nm to 400 nm is activated and oxidizes and decomposes organic substances (acetaldehyde, ammonia, etc.), nitrogen oxides, chlorine compounds, and the like. The coating thickness containing the photocatalyst particles may be arbitrarily determined according to the purpose of use. For example, it may be applied to a thickness of about 0.1 μm to 20 μm. The application was performed by spraying, electrostatic printing, inkjet, dipping, or the like.

The titanium dioxide is preferably an anatase type, but may be a rutile type titanium dioxide metallized with copper, silver, platinum or other metals. Alternatively, a photocatalyst may be formed of a semiconductor such as WO ↓ 2, Cds, SrTiO ↓ 2, and MoS ↓ 2.

Further, the same applies to the case where the photocatalyst may be impregnated with water or an organic solvent (such as aniline). The photocatalyst impregnated with water or an organic solvent may be mixed with a liquid material such as an arbitrary inorganic or organic binder, vehicle, paint, adhesive or the like, and applied to the surface of the target member. The water or organic solvent impregnated in the photocatalyst evaporates during the heating and drying process of the liquid material, and pores are formed in the photocatalyst holding film, so that the photocatalyst can be directly irradiated with near ultraviolet rays. Also, irregularities are formed on the film surface.

Further, a structure in which the surface of the titanium oxide particles is covered with a photo-inert substance, a structure in which the surface of the titanium dioxide particles is covered with a porous wall made of a photo-inert substance, or a surface of the titanium dioxide particles is covered with apatite of ceramics Any configuration such as a configuration may be used.

The photo-inert substance is any one of silicon, aluminum, zirconium, calcium, barium, strontium, magnesium, zinc, niobium and the like, or a combination thereof. By coating the surface of titanium dioxide with one of a photoinactive substance, a porous wall made of the photoinactive substance, and apatite, deterioration of a photocatalyst carrier (holding member) such as paper, resin, and fiber can be reduced. .

(4) According to the present invention, in addition to the above-mentioned heat conductor or photocatalyst, a light storage member is mixed in a coating film of silicon resin or fluorine resin or the like in an amount of several W% to 20 W%. And This is for activating the photocatalyst at night when sunlight and lighting are cut off, and also for making the case stand out and providing decorativeness and fashionability. As a phosphorescent substance, for example, Nemoto Special Chemicals / N night light, or S
rAl ↓ 2O ↓ 4: Eu (emission peak wavelength 520 nm,
Afterglow luminance of 300 mcd / m ↑ 2 (luminance after 20 minutes of irradiation at 200 LX for 4 minutes), afterglow time of 2,000 minutes or more (0.
Time required to decay to 32 mcd / m ↑ 2)), or ZNs: Cu, or ZnS, CdS, CaS,
Any member such as one or two kinds of sulfide-based phosphorescent materials such as (ZnCd) S may be used. The thickness of the coating film containing the luminous substance was also set to a minimum of about 0.1 μm to 20 μm.

Examples of the coating material containing any one or a combination of a general particle member, a heat conductor, a photocatalyst, and a light storage member include, in addition to those described above, vinyl acetate, urethane, and UV resin (ultraviolet curable resin). Organic binders, rubber members (eg, natural rubber, butyl rubber, etc.), vinyl chloride, phenolic resin urea resin, melamine resin, unsaturated polyester resin, alkyd resin, polyethylene, polystyrene, polypropylene, vinylidene chloride resin, methacrylic resin, polyamide resin Any member such as polycarbonate, polyethylene terephthalate, norbornene-based resin may be used.

When the housing material is a metal member, for example, A
One of L, Zn, Mg alloy and the like. In the case of a resin member, for example, an acrylic resin, an epoxy resin, polycarbonate, vinyl chloride, vinylidene chloride, styrene, polyacetal, urethane, ABS, PS, PP and the like were used.

An infrared absorber such as black aniline black (organic pigment), polymethylene dye, trisazo dye amine salt, cyanine dye or its metal complex, anthraquinone, aminium, phthalocyanine, etc. Ytterbium sulfate, Ytterbium acetate, YbPO ↓ 4 (particle size 0.5 μm or less), P ↓ 2O ↓ 5, N-tetraphenyl benzoquinone diimonium salt, iron oxide, carbon black, naphthoquinone oximate ferrous iron , Silicon oxide, magnesium silicate or the like, or a combination thereof may be mixed in an amount of about 0.01 W% to 20 W%.

Further, a coating film containing (mixed with) the infrared absorbing agent may be applied to the inner surface side of the housing. The infrared absorber absorbs heat generated in the CRT, the control circuit, and the like toward the housing. As another means for forming the infrared absorbing function coating, a processing means for blackening the inner surface of the Mg alloy molded casing, for example, a chromate treatment or an acidic aqueous solution treatment may be used. For details, (1) Blackening treatment by chromate treatment As a treatment means for blackening the surface of the Mg alloy molded casing,
For example, prior to chromate treatment, the solvent is degreased, treated with an aqueous solution of pyrophosphate (concentration of 10 to 50 g / l) and treated with an aqueous solution of alkali hydroxide (concentration of 10 to 100 g).
/ L) at room temperature to 70 degrees Celsius for 0.5 to 5 minutes, and treatment with a chromate treatment solution at room temperature to 35 degrees Celsius for 0.5 to 5 minutes. Two minutes. (2) Method of blackening treatment by acidic aqueous solution treatment After cleaning the surface of the Mg alloy molded casing by pickling and washing with water, Zn ion concentration; 1 to 30 g / l, pH> 12, temperature; The surface is immersed in a 50 degree Zn-containing alkaline aqueous solution for 15 seconds to 5 minutes to chemically plate Zn on the surface. Next, after washing with water, Sn, Cu, Pb, Ag,
Particularly, a black film is formed by performing a surface treatment for 5 seconds to 5 minutes with an acidic aqueous solution of 10 to 60 degrees Celsius such as a sulfate, a nitrate or a chloride containing 0.1 to 20 g / l of metal ions such as Cu and Ag. . (3) Method of Applying Paint Containing Infrared Absorber Resin Composition Combining Phthalocyanine Infrared Absorber with Binder Resin such as Acrylic Resin, Epoxy Resin or Silicon Resin on the Inside Surface of Mg Alloy Molded Housing It was coated to a thickness of 0.1 to 20 μm as (painting).

According to the above configuration, the resin housing having the unevenness having a height difference of at least 0.7 μm on the surface can improve the heat radiation effect, reduce the opening area, and prevent dust. Also,
A metal case made by injection molding a metal, for example, an Mg alloy, can be safely reused without generating harmful substances. Also, the recycling rate is improved. As a result, it helps the environment.
Further, the metal housing can easily absorb or generate heat from the heat generated in the control circuit section or the like efficiently, and can eliminate or greatly reduce the number of heat radiation holes. As a result, it is possible to provide a highly reliable electronic device (such as a television receiver or a monitor) by reducing the intrusion of dust or moisture and preventing a short circuit or failure of the control circuit portion. The light storage member activates the photocatalyst at night even when the light is turned off. In addition, decorativeness and fashion can be imparted.
The infrared absorbing film absorbs heat generated inside the housing such as the control circuit unit, and reduces a temperature rise in the housing.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The first invention of the present invention is to provide a coating film which is formed by injection molding a metal member having a specific gravity of 2 or less and includes a particle member which forms surface irregularities of at least 0.7 μm to 30 μm. A housing for an electronic device characterized by including the above, and promotes heat radiation from the housing surface to eliminate or eliminate an opening. In addition, the recycling rate of the housing is improved.

A second invention is characterized in that the particle member is any one of copper, silver, alumina (Al 2 O 3), graphite, carbon, photocatalyst or a combination thereof. Wherein the heat conductor promotes heat radiation from the housing surface. The photocatalyst decomposes organic substances, nitrogen oxides and the like attached to the surface, and exhibits an antibacterial action.

According to a third aspect of the present invention, there is provided the electronic device housing according to the first aspect of the present invention, wherein the photocatalyst is activated at night. At the same time, the case is made more prominent to provide decorativeness and fashion.

According to a fourth aspect of the present invention, there is provided the electronic device housing according to any one of the first to third inventions, wherein an infrared absorbing film is additionally provided on the inner surface side of the housing. Things
The heat generated in the housing is absorbed by the housing to prevent the temperature inside the housing from rising.

According to a fifth aspect of the present invention, there is provided a coating material including a particle member forming a surface irregularity of at least 0.7 μm to 30 μm on an outer surface side by mixing an infrared absorbing member into a resin member constituting a housing and performing injection molding. A housing for an electronic device characterized by having a coating, which absorbs heat generated inside the housing and improves heat dissipation efficiency.

[0032]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a housing of an electronic apparatus according to an embodiment of the present invention.

(Embodiment 1) FIG. 1 is a sectional view of a main part showing the concept of a two-part type cabinet (cabinet) constituting a television receiver according to a first embodiment of the present invention. That is, the rear case (back cover) having the bottomed container shape and the front plate are separated from each other, and are formed by injection molding of a Mg alloy.

An infrared absorbing coating was provided on at least the inner surface of the housing. Means for arranging the infrared-absorbing function coating is to use a phthalocyanine-based infrared
% To several tens W%, in combination with an acrylic resin to form a resin composition (made into a paint) to a thickness of 0.1 to 20 μm.

On the outer surface side of the housing, about 10 W% of titanium dioxide photocatalyst particles (having a particle size distribution of about 0.01 μm to 20 μm) are mixed into a silicon-based paint.
What mixed about 10 W% of the phosphorescent member was spray-coated. Therefore, irregularities having a height difference of about 20 μm at the maximum are formed on the outer surface and have a light storage function.

In addition, 1 μm to 40 μm is applied to the silicone paint.
A total of 10 μm thermal conductive particles (alumina particles)
About W% may be mixed to increase the height difference of the unevenness and improve the heat transfer. When the heat conductive particles were mixed together, the outer shape of the photocatalyst particles was reduced to 0.001 μm to several μm. Of course, the photocatalyst may be titanium dioxide particles containing either water or alcohol. Further, as a coating film to be disposed on the outer surface side of the housing, a mixture obtained by mixing only about 10 W% of good thermal conductive particles (alumina particles having an outer diameter of about 30 μm) with an acrylic resin paint is spray-coated, and the height difference is several tens. A coating having a surface roughness of μm may be provided. Furthermore, a particle member is mixed and superimposed on the film formed with surface irregularities, and either a liquid material containing titanium dioxide particles (Ishihara Sangyo, ST-K01) or a liquid material containing a phosphorescent member or a combination thereof May be laminated. When a photocatalyst layer is laminated on a film having surface irregularities, titanium dioxide may be deposited or sputtered instead of the liquid containing titanium dioxide particles.

Next, an example of the structural dimensions of the two divided housings is shown in CR.
One example of each of T size 14 inches and 32 inches is shown. In both cases, the thickness T of the main surface was in the range of about 1 mm to about 2 mm. Considering the dimensional variation in manufacturing, T
Is in the range of 0.8 mm to 2.2 mm.

The specific gravity of the Mg alloy is about 1.8, usually 1.8.
It is set within a range of about ± 10%. The thickness T of the main surface is in the range of about 1 mm to about 2 mm, which is smaller than that of the resin molded product. This is because the Mg alloy has higher rigidity and prevents the weight of the product from becoming too large compared to the resin, and in some cases, makes the product lighter than the resin.
Also, as listed in the dimension table of FIG. 1, the facing distance (inner width W or inner height H) between the main surfaces at the opening end on the fastening side is about 320 mm or more, and the inner depth D is About 15
It was set to 0 mm or more.

If necessary, the top surface, bottom surface,
Ribs, bosses, and the like for adding rigidity to the side surface, the rear surface, and the like may be provided at any positions in any shape. According to the first embodiment, heat generated from the control circuit components, the CRT, and the like is conducted to the lower portion (bottom portion) of the metal housing, and is also radiated from other surfaces through convection and radiation. I do. Therefore, the metal housing can reduce or eliminate the heat radiation holes formed in the conventional resin housing. This reduces the ingress of dust, water or other foreign matter into the television receiver. As a result, it is possible to reduce the possibility that the control circuit section is short-circuited or break down, thereby providing a highly reliable television receiver. Also,
Injection molding improves design flexibility. Of course, the recovery rate and recycling of the housing are improved. Further, a shielding effect against electromagnetic wave interference and the like can be obtained. further,
Since the infrared absorbing agent is provided on the inner surface of the housing, the infrared absorbing device can efficiently absorb infrared rays (radiation rays) from the heating element housed therein and radiate heat from the outer surface.

(Embodiment 2) FIG. 2 is a sectional view of a main part showing the concept of a two-part resin housing (casing) constituting a television receiver according to a second embodiment of the present invention. The configuration is almost the same as that described in the section of the prior art, and the detailed description is omitted.

In FIG. 2, a housing 30 is made of a synthetic resin such as PS (polystyrene) or ABS (acrylonitrile butadiene styrene), and is formed of two parts by injection molding: a front plate 31 and a rear housing (back cover). )
32. An infrared absorber was provided on the surface of the front plate 31 and the rear housing 32 on the side where the CRT, the control circuit unit, the speaker device, and the like were stored, that is, on the inner surface. The following two means were used for disposing the infrared absorbent. (1) Method of Molding Resin Member Mixed with Infrared Absorber A molded housing is formed by kneading a polystyrene resin with a phthalocyanine-based infrared absorber of several W% to 10 W%. Alternatively, an infrared absorbent 7 is added to 100 parts by weight of the thermoplastic norbornene resin.
A composition in which a resin composition is prepared by adding 〜100 parts by weight and molded to obtain a housing. Alternatively, a black dye is mixed with vinyl chloride resin in an amount of 0.1 W% to 5 W%, and molded to obtain a housing. (2) Method of Applying Paint Containing Infrared Absorber A phthalocyanine-based infrared absorber is combined with a binder resin such as an acrylic resin, an epoxy resin, or a silicone resin on the inner surface of the resin molded housing to form a resin composition ( (Coating) to a thickness of 0.1 to 20 microns.

About 10 W% of titanium dioxide photocatalyst particles (having a particle size distribution of about 0.01 μm to about 20 μm) are mixed into a silicon-based paint on the outer surface side of the housing.
What mixed about 10 W% of the phosphorescent member was spray-coated.

In addition, 1 μm to 40 μm is applied to the silicone paint.
A total of 10 μm thermal conductive particles (alumina particles)
As in the first embodiment, about W% may be mixed.
Further, the photocatalyst may be titanium dioxide particles containing either water or alcohol. Further, as a coating film to be disposed on the outer surface side of the housing, a mixture obtained by mixing only about 10 W% of good thermal conductive particles (alumina particles having an outer diameter of about 30 μm) with an acrylic resin paint is spray-coated, and the height difference is several tens. A coating having a surface roughness of μm may be provided.

In the above description of the two embodiments, an example of a television receiver has been described, but it is needless to say that the electronic apparatus is not limited to this. Any device including a video display, such as a mobile phone and a barcode reader, is optional. Also, the image display may be any other than CRT, such as plasma and liquid crystal. Further, the type of the electronic device may be any device such as a video camera, an audio device, and a satellite broadcast device (for example, a down converter). Further, the molding means of the housing (housing) may be arbitrarily determined by injection molding a resin member or an Mg alloy.
Blow molding, compression molding or the like may be performed, or any other method such as pressing or pressing a plate-shaped member may be used.

In the case of the plasma display shown in FIG. 6, an infrared absorbing agent (infrared absorbing function) is provided on the inner surface of the front panel 6 and the rear panel 7, and an uneven film containing a particle member is provided on the outer surface. With this configuration, the heat radiation efficiency is improved. Also, in the case of the portable information terminal shown in FIG.
An infrared absorber (infrared absorbing function) is provided on the inner surface of the housing that holds the liquid crystal display and on the inner surface of the housing that houses the control circuit board, and the outer surface is provided with irregularities including a particle member and a phosphorescent member. With a configuration having a film, the heat radiation efficiency and fashionability are improved. Further, it goes without saying that the electronic device is not limited to a video device, and may be any device such as a camera, a headphone stereo, and a portable mini-disc player (optical disc player).

[0046]

As described above, according to the present invention, when the housing is injection-molded with an Mg alloy, a large number of heat radiating holes are provided on the top surface, both side surfaces, the lower surface, the rear surface, etc. as in the case of the conventional resin housing. No need to do. The metal housing can be safely reused without generating harmful substances. Also, the recycling rate is improved. as a result,
Useful for environmental protection. In addition, heat generated in the control circuit section and the like is easily transmitted to each component surface of the housing, and radiates heat from each component surface without providing many heat radiation holes. Therefore, intrusion of dust and moisture is reduced. As a result, a short circuit or a failure of the control circuit can be reduced, and a highly reliable electronic device (such as a television receiver or a monitor) can be provided. Further, the case provided with the unevenness having a height difference of 0.7 μm or more on the surface improves the heat radiation effect, reduces the opening area, and achieves dust prevention. The light storage member activates the photocatalyst at night even when the light is turned off. In addition, decorativeness and fashion can be imparted. The infrared-absorbing coating absorbs heat generated inside the housing such as the control circuit unit, and reduces the rise in the temperature inside the housing.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of the present invention in a state where a two-piece housing is separated.

FIG. 2 is a sectional view of a main part of a television receiver according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a conventional television receiver.

FIG. 4 is a conceptual diagram illustrating a configuration of a control circuit unit included in a conventional television receiver.

FIG. 5 is a perspective view showing the concept of a front plate constituting a conventional television receiver.

FIG. 6 is a sectional view of the concept of a conventional plasma display.

FIG. 7 is a perspective view of the concept of a conventional portable information terminal.

[Explanation of symbols]

 Reference Signs List 30 housing (cabinet) 31 front plate 32 rear housing (cabinet) 33 CRT (cathode ray tube) 34 boss

Claims (23)

[Claims] 1. An electronic device comprising: a metal member having a specific gravity of 2 or less, which is injection-molded, and a coating film including a particle member having a surface unevenness having a height difference of at least 0.7 μm to 30 μm. Equipment housing. 2. A front panel to which a display is attached, and a rear casing attached to the front panel, wherein the front panel and the rear casing are formed by injection molding a metal member having a specific gravity of 2 or less. Further, a housing for an electronic device is provided with a coating film containing a particle member that forms surface irregularities having a height difference of at least 0.7 μm to 30 μm on the surface of the front plate and the rear housing. 3. The housing of an electronic device according to claim 1, further comprising a phosphorescent member in the coating film. 4. The particle member is made of copper, silver, alumina (Al ↓ 2).
The electronic device housing according to any one of claims 1 to 2, wherein any one of O ↓ 3), graphite, carbon, and a photocatalyst is used or a combination thereof. 5. The electronic device casing according to claim 4, wherein the photocatalyst is titanium dioxide particles. 6. The electronic device casing according to claim 5, wherein the photocatalyst is titanium dioxide particles containing either water or alcohol. 7. A photocatalytic particle on the surface of at least 0.
A housing for an electronic device, wherein a coating film for forming irregularities of 7 μm to 30 μm is provided. 8. The housing for an electronic device according to claim 7, further comprising a phosphorescent member in the coating film. 9. The electronic device housing according to claim 7, further comprising an infrared absorbing film disposed on an inner surface side of the housing. 10. The electronic device casing according to claim 7, wherein the photocatalyst is titanium dioxide particles. 11. A housing for an electronic device according to claim 10, wherein the photocatalyst is titanium dioxide particles containing either water or alcohol. 12. The electron according to claim 11, wherein the surface of the photocatalyst particles is covered with any one of a photoinactive substance, a porous wall made of the photoinactive substance, and apatite of ceramics. Equipment housing. 13. The method according to claim 1, wherein the photoinactive substance is any one of silicon, aluminum, zirconium, calcium, barium, strontium, magnesium, zinc, and niobium, or a combination thereof.
3. The housing of the electronic device according to 2. 14. A particle member formed by injection molding a metal member having a specific gravity of 2 or less, applying an infrared absorbing film on at least the inner surface, and forming surface irregularities of at least 0.7 μm to 30 μm on the outer surface. A housing for electronic equipment, characterized by having a coated film. 15. The electronic device casing according to claim 14, further comprising a phosphorescent member in the coating film. 16. The electronic device casing according to claim 14, wherein the infrared absorbing coating is blackened. 17. The method according to claim 17, wherein the particle member is made of copper, silver, alumina (Al ↓).
20. The electronic device housing according to claim 14, wherein any one or a combination of graphite, carbon, and a photocatalyst is used. 18. The electronic device casing according to claim 17, wherein the photocatalyst is titanium dioxide particles. 19. The electronic device casing according to claim 18, wherein the photocatalyst is titanium dioxide particles containing either water or alcohol. 20. The electron according to claim 19, wherein the surface of the photocatalyst particles is covered with any one of a photoinactive substance, a porous wall made of the photoinactive substance, and apatite of ceramics. Equipment housing. 21. The photoinactive substance is any one of silicon, aluminum, zirconium, calcium, barium, strontium, magnesium, zinc and niobium or a combination thereof.
0. The housing of the electronic device according to 0. 22. An infrared absorbing member is mixed into a resin member constituting a housing and injection-molded.
An electronic device housing, comprising: a coating film including a particle member that forms surface irregularities of 7 μm to 30 μm. 23. A housing for an electronic device, wherein a metal member having a specific gravity of 2 or less is injection-molded, and a coating film including a phosphorescent member is provided on at least a part of its surface.