JP2002225073A - Electronic appliance box body and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To jointly provide the advantage of a box body made of a metal for an electronic appliance and the advantage of a box body made of a synthetic resin, increase the productivity, provide a mass-productivity, and freely design the shape and the structure. SOLUTION: For this electronic appliance box body, a processed metal case 6 and a resin part 7 which is molded by injection molding on the surface of the metal case 6 are integrated. In such an electronic appliance box body, a thermoplastic resin which is injected to constitute the resin part is a resin containing an olefin based resin which is modified by an unsaturated carboxylic acid or its derivative. In this case, the resin part is integrated with and fixed to the metal case 6 by heat-welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for electronic equipment and the like and a method for manufacturing the same. In more detail, metal cases such as pre-processed metal plates and duct-cast products are reinforced, electronic devices are attached, and resin parts are fixed by integrating synthetic resin to facilitate interior and exterior. Electronic device housing and manufacturing method thereof.

[0002]

2. Description of the Related Art Information communication devices such as mobile phones, mobile computers, digital cameras, and home appliances employing a metal housing made of a magnesium alloy, an aluminum alloy or the like are increasing. For example, a housing of an electronic device made of a magnesium alloy has a beautiful metallic color.
Although the weight is about 1.5 times heavier than plastics resin, the mechanical strength is 2 to 3 times stronger, so that it can be made thinner, resulting in lighter weight. It is in the limelight because of its electromagnetic shielding effect. For molding of magnesium alloys, the injection molding method has recently been commercialized from the conventional die casting method.

[0003] Injection molding of a magnesium alloy uses a special injection molding machine to inject the magnesium alloy into a mold to complete electronic parts, a housing, and the like. This enables molding. However, the obtained injection-molded products are liable to contain so-called gas, flow mark, and burrs, and at present, clean-up processing by cutting, grinding, etc. is indispensable before turning to surface treatment. Not come up.

[0004] In recent years, it has become possible to supply a material that can be subjected to metal press working with a magnesium alloy or an aluminum alloy, and the present inventors have paid attention to this. Metal press working involves punching, cutting, bending, drawing, and the like from a sheet material, and the shape of a molded product is limited, and a complicated-shaped product such as an injection molded product cannot be obtained. For example, even if the outer shape of the housing can be pressed into a desired design, it is for fixing the electronic circuit board in the housing, and simultaneously forming structures such as partition walls, screw holes, and reinforcing ribs inside It is difficult.

[0005] In short, if a housing for an electronic device is to be made by metal pressing, there is a problem in assembling, though clean-up processing is unnecessary.

[0006]

SUMMARY OF THE INVENTION The present invention has been made under the above-mentioned technical background, and achieves the following objects.

SUMMARY OF THE INVENTION An object of the present invention is to provide a housing for an electronic device which achieves both the goodness of the housing of a metal electronic device and the goodness of a synthetic resin, and a method of manufacturing the same.

It is another object of the present invention to provide a case of a metal electronic device having high productivity and mass productivity and a method of manufacturing the same.

It is still another object of the present invention to provide a case of a metal electronic device whose shape and structure can be freely designed and a method of manufacturing the same.

[0010]

According to the present invention, there is provided an electronic equipment housing in which a processed metal case and a resin component formed by injection molding on the surface of the metal case are integrated. A thermoplastic resin injected to constitute a resin component is a resin containing an olefin resin modified with an unsaturated carboxylic acid or a derivative thereof.

Specific examples of the modified unsaturated carboxylic acids and derivatives thereof include acrylic acid, methacrylic acid, crotonic acid, isocrotonic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, tetrahydrophthalic acid and the like. Unsaturated carboxylic acids or their anhydrides are preferred.
In particular, maleic acid or its anhydride is more preferred.

The olefin resins include ethylene, propylene, 1-butene, 1-hexene and 4-methyl-1.
A homopolymer of an α-olefin such as pentene, or
The amount of the modified α-olefin resin contained in the thermoplastic resin in the copolymer of α-olefins is 5 to 100%.

In the present invention, the unsaturated carboxylic acid or
The unsaturated carboxylic acid contained in the olefin resin modified with the derivative or the content of the derivative is 0.0
It is preferably from 1 to 20% by weight, especially from 0.1 to 10% by weight. If the content of the unsaturated carboxylic acid or its derivative is less than the above range, the metal case 6
The initial purpose cannot be attained due to the low adhesive strength at the time of fixing to the surface. On the other hand, if the content exceeds the above range, a gel or the like is generated in the modified polymer, which becomes a fish eye or a bump, resulting in poor appearance and a decrease in adhesive strength.

The modification of the unsaturated carboxylic acid or its derivative is performed by a graft reaction. The graft reaction conditions include, for example, di-t-butyl peroxide,
t-butylcumyl peroxide, dicumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxide) hexane, 2,5-dimethyl-2,5-di (t
Dibutyl peroxides such as-(butyl peroxy) hexyne-3, t-butyl peroxy acetate, t-butyl peroxybenzoate, t-butyl peroxy isopropyl carbonate, 2,5-dimethyl-2,5-
Di (benzoylperoxy) hexene, 2,5-dimethyl-2,5-di (benzoylperoxy) hexyne-3
Organic acids such as peroxyesters such as benzoyl peroxide, diacyl peroxides such as benzoyl peroxide, diisopropyl benzene hydroperoxide, and hydroperoxides such as 2,5-dimethyl-2,5-di (hydroperoxide) hexane. 80 to 300 ° C. using peroxide in an amount of about 0.001 to 10 parts by weight based on 100 parts by weight of the olefin resin.
A method in which the reaction is carried out in a molten state or a semi-molten state at about the temperature is employed.

Further, the resin component may be integrally fixed to the metal case by heat fusion. Further, the olefin resin may be an α- such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene or the like.
It may be an olefin homopolymer or a copolymer of α-olefins.

Further, the unsaturated carboxylic acid or its derivative may be maleic acid or its anhydride. Further, the resin component may be a structural portion for a function as a mechanical element, such as a screw, a nail, a rib, a boss, or the like.

The method for manufacturing an electronic device housing according to the present invention is a method for manufacturing an electronic device housing including a metal case, comprising the steps of: inserting the metal case into an injection mold; 2. The modified resin composition according to claim 1, wherein said injection mold is formed of at least one thermoplastic resin selected from polyamide resin (PA), polyacetal (POM), polycarbonate (PC), polyester resin, and ABS resin. injecting a resin containing an α-olefin resin.

The modified α contained in the thermoplastic resin
-The amount of the olefin resin is 5 to 100%.

[0019]

[First Embodiment] A first embodiment of the present invention will be described below with reference to the drawings. An example in which the housing of the electronic device of the present invention is employed in a portable telephone will be described. Figure 1
1 is a front view of a portable telephone provided with the housing of the present invention. The portable telephone 1 is composed of a telephone main body 2 made of a synthetic resin, and electronic equipment such as an IC for realizing the function of the telephone is installed in the telephone main body 2.

The telephone body 2 is composed of two bodies and is divided into two parts by a dividing plane at the center in the thickness direction. A case cover 3 is disposed on an upper surface of the telephone main body 2, and a back surface main body 4 is disposed on a rear surface thereof. The case cover 3 performs both functions of a control panel and a function of the telephone main body 2, and a plurality of push buttons 5 are arranged to form a key group.
The push button 5 drives contacts (not shown) arranged in the telephone main body 2. The case cover 3 and the back surface main body 4 are integrally fixed by fixing means (not shown) such as screws or notches.

FIG. 2 is a sectional view of the case cover taken along the line II-II in FIG. The outer surface of the case cover 3 is formed from a metal case 6 made of a magnesium alloy. The metal case 6 is made by injecting a magnesium alloy into a mold using an injection molding machine, but this manufacturing method is known and will not be described in detail here. In addition, those having a relatively simple shape are manufactured by press working. In the case of press working, it can be manufactured at low cost. The metal case 6 efficiently shields an electromagnetic wave generated from an electronic component such as an IC or an electromagnetic wave from another electronic device or the like.

The metal case 6 is usually subjected to a surface treatment by a well-known method such as a chemical conversion treatment, a metal plating or the like in order to improve corrosion resistance, abrasion resistance and decorativeness. A rib 7 (resin part) made of a thermoplastic resin is integrally fixed to the inner surface of the metal case 6 for partitioning and reinforcement. This fixation is heat-sealed by a method described later and integrated with the metal case 6.

In the present invention, the thermoplastic resin for forming the ribs 7 integrally includes an olefin resin modified with an unsaturated carboxylic acid or a derivative thereof. Therefore, the ribs 7 are integrally fixed to the metal case 6 by the thermal fusion of the thermoplastic resin.

The thermoplastic resin preferably has mechanical strength and physical properties. For example, a polyamide resin (P
A) a resin containing a modified α-olefin resin in a thermoplastic resin selected from one or more selected from polyacetal (POM), polycarbonate (PC), polyester resin, ABS resin (ABS), etc. Is desirable. In some cases, high-strength fibers such as metal fibers, carbon fibers, and glass fibers may be mixed.

Before the rib 7 is injection-molded, the surface of the metal case 6 is covered with at least one organic skin layer 30, that is, a lining or a coating (in the present invention, this includes printing and painting). ing. The skin layer 30 has good adhesion to the metal case 6 and the rib 7
It is preferable that the thermoplastic resin having good heat-fusibility is also used.

In this embodiment, the di (1, 3, 5)
-Triazine-2,4,6-trithiol) triethanolamine complex (hereinafter referred to as triazinethiol derivative). The details of this triazinethiol derivative are described in JP-A-2-233666 (related art is JP-A-2-298284).
The triazine thiol derivative includes di (1,3,5-triazine-2,4,6-trithiol) triethanolamine complex and 1,3,5-triazine-2,4,6
-Is obtained by heating and reacting trithiol and triethanolamine in a solution, without being solidified to form a lump, precipitated as a crystal from an aqueous solution, can be easily separated from the aqueous solution by filtration, Grinding is also easy.

It has high stability to hydrolysis and can be stored for a long time in water. One of the characteristics of the use of the triazine thiol derivative is that it is a material which does not easily generate static electricity. Further, since it can be used as a neutral or weakly acidic solution, it can be used as a metal surface treatment agent, and in this case, it has excellent properties such as no alkali burning on the metal surface. This triazine thiol derivative is applied as a skin layer 30 on the surface of the metal case 6. This coating is performed thinly and at a thickness of nanometer level.

The skin layer 30 has good adhesion to the surface-treated metal substrate, and the skin layer 30 strongly adheres to the metal surface, and is fused with the thermoplastic composition described above, or is used for injection molding. The layer must be capable of reacting and bonding with heat and pressure. The above-mentioned skin layer 30 satisfies this condition, and in order to perform this reactive bonding, only one type of skin layer 30 may be applied in one layer. May not be enough. That is, two-layer coating using both the two coating materials 14 and the second coating material that can be expected to be bonded and fused by injection molding between the first coating material having excellent metal adhesion and the thermoplastic resin is performed. In some cases, it is more preferable.

The overlap coating will be described in detail. As the first coating material, a one-component curable or two-component curable epoxy coating material can be used. Specifically, a metal coating paint, an epoxy resin commercially available as a printing ink on a metal surface, or the like can be used. A modified epoxy screen printing ink and a pad printing ink can be used.

As the second coating material, paints, inks and coating materials made of urethane-based, acrylic-based and polyester-based synthetic resins can be used, and preferably, urethane-based two-component curable paints and inks, one-component type Acrylic paints and inks and one-pack polyester inks and coating materials can be used.

The method of applying, drying and baking (curing) the first and second coating materials will be described. First, an undesirable coating method will be described. So-called WET ON W
In the ET method, that is, the method of applying the second coating material while the drying of the first coating layer after the application is completely insufficient, a satisfactory result cannot be obtained in many cases.

In the case where the second coating material is applied after the first coating material is subjected to a heat-curing treatment, usually at 120 to 150 ° C. to crosslink and cure the epoxy layer, the first coating layer and the second coating material are applied. The adhesive strength of the two coating layers often becomes insufficient. The detailed application method varies depending on what is actually used as the coating material 14. A preferred method is to apply the first coating material and then semi-harden by evaporating the contained solvent by air drying for about one day or forced drying at a relatively low temperature.

For example, if the first coating material is a one-part curable modified epoxy paint, the curing conditions are 120 to 15
Since it is 0 ° C, it is semi-cured by heating at a low temperature of 70 to 100 ° C. When the first coating material is a two-component curable epoxy paint, ink, adhesive, or the like, a method of semi-curing by evaporating most of the solvent under a temperature condition lower than the specified curing conditions is preferable. The application of the second coating material is preferably carried out after that to obtain a favorable result.

After the application of the second coating material, a heat curing treatment is performed. The first coating layer, which has been partially cured, is completely cured, and the second coating layer, which uses a curable coating material, is cured, and if a non-curable coating material is used, it is solidified by volatilization of a solvent. To

The treated metal case 6 is inserted into an injection mold for injecting the rib 7. FIG.
FIG. 3 is a cross-sectional view of an injection mold in which the surface of a metal case 6 is filled with a thermoplastic synthetic resin by injection molding. The pretreated metal case 6 is inserted and arranged in the cavity 11 of the movable mold plate 10.

The fixed mold plate 15 is closed with the metal case 6 inserted into the cavity 11. The cavity 11 is a space formed by the metal case 6, the movable mold plate 10, and the fixed mold plate 15 in a state where the movable mold plate 10 and the fixed mold plate 15 are closed. The cavity 11 is provided as a partial space. That is, the space is not provided over the entire metal case 6, but is provided only as a structure, for example, a space for ribs, bosses, hooks, and the like.

The molten resin of the thermoplastic synthetic resin forming the ribs 7 and the like is supplied to the cavity 11 through the runner 17 and the gate 16 to form the ribs 7 and the like. This molten resin is filled only in the vicinity including the rib 7 and the like. The partial supply of the molten resin has a strong contracting force of the supplied resin. Therefore, if the molten resin is supplied and fixed to a wide area of the thin metal case 6, the resin may be deformed due to the contracting force. To avoid it. In addition, since no extra molten resin is supplied, it is advantageous in terms of cost when the production amount is large.

The completed casing of the case cover 3 has a metal case 6 and a rib 7 made of a thermoplastic synthetic resin which are integrally joined to each other, and has a metal characteristic in terms of strength and external design. The shape and the structure inside the housing can be made complicated while making the best use. In addition, the back surface main body 4 constituting the telephone main body 2 together with the case cover 3 is manufactured in the same manner.
The resin component has been described mainly with respect to the rib 7, but the present invention is not limited to the rib, and the same applies to screws, claws, and bosses.

[Second Embodiment] In the first embodiment, the ribs 7 are formed only on the back surface of the metal case 6, but the ribs 7 need not necessarily be formed only on the back surface.
That is, when the mechanical strength of the metal case 6 is insufficient, a method of bending a part of the metal case 6 to increase the section modulus, or forming a hole in the metal case 6 by forming a hole in the metal case 6 to reduce the resin. There is a method of penetrating through the front and back of the metal case.

FIG. 4 shows a metal case and an injection mold according to the second embodiment, and shows a cross-sectional view before filling a thermoplastic synthetic resin by injection molding. The metal case 12 is obtained by forming the metal case 12 by plastic working and forming the through holes 8. This metal case 12
Is formed by projecting by drawing, forming protrusions 9 projecting into the inside of the housing at a plurality of necessary positions.
The through holes 8 are formed by punching. After this processing, after the above-mentioned skin layer 30 is applied and cured,
Inserted into the injection mold.

The molten resin injected through the gate 16 is
Only the vicinity of the concave portion 13 formed outside the metal case 12 is filled. Further, spaces are individually provided in the cavities 18 inside the metal case 12 where the ribs 7 are formed, and the molten resin is supplied through the gate 16a. Since the metal case 12 has the through hole 8 formed at a necessary place, there is also an effect that the molten resin flows smoothly during the injection molding.

[Embodiment 3] Embodiments 1 and 2 above
Has formed structural members such as partition walls and ribs 7 on the surfaces of the metal cases 6 and 12, but a skin may be formed together with these structural members. That is, in order to improve the appearance of the portable telephone 1 due to the design requirement and to improve the feel of the hand when used by the user, the metal case 6,
It is preferable to arrange a skin made of a thermoplastic elastomer on the outer surface of Twelve.

FIG. 5 is a cross-sectional view showing a part of the housing of the electronic apparatus according to the third embodiment. A structure 21 such as a boss for fixing to a printed board 22 mounted inside the housing is provided. A part of the metal case 20 is shown. Metal case 20
Is inserted into an injection mold (not shown).
The injection molding die is filled with a thermoplastic elastomer to form the skin 23 of the metal case 20. The melted thermoplastic elastomer flows over the surface 24 of the metal case 20 and covers it, forming the case cover 25. Desirably, the thermoplastic elastomer is at least one thermoplastic composition selected from a thermoplastic polyurethane elastomer, a thermoplastic polyester elastomer, and a thermoplastic polyamide elastomer.

Example 1 (Application of First Coating Material) The following experiments and experiments were conducted to confirm the bonding strength between the metal cases 6, 12, and 20 and the ribs 7 and the like. Was. Hereinafter, this embodiment will be described. A rectangular (30 mm × 10 mm × 1 mm) magnesium alloy (AZ91D) test piece is subjected to a non-chrome caustic treatment by a conventional method to increase corrosion resistance, and then a half of the test piece in the length direction is masked with an adhesive tape.

A coating material prepared by the following method was applied thereto at normal temperature and normal pressure. In the production method of the first coating material, first, a mixed liquid of a liquid modified epoxy paint main liquid having the following mixing ratio is prepared.

(1) Alkyd-modified epoxy resin: 25 parts (2) Titanium oxide powder: 10 parts (3) Ultrafine powdered calcium carbonate: 5 parts (4) Aromatic mixture (toluene 96%, xylene 4%) 25 parts (5) Isopropanol (2-propanol) 15 parts (6) Methoxypropanol 5 parts (7) Methyl ethyl ketone 12 parts (8) Propylene glycol monomethyl ether acetate 3 parts (9) Silicon Oil: 0.2 parts To 50 g of this alkyd-modified epoxy coating main liquid, 3 g of mixed TDI (tolylene diisocyanate) as a curing agent is sufficiently stirred. An aromatic mixture (toluene 96%, xylene 4%) is further added as a solvent to the stirred mixed solution.
20 g of a solvent consisting of 60 parts and 40 parts of isopropanol
And mix with stirring. As a result, the final mixing ratio of the first coating material is as follows.

(10) Main liquid of modified epoxy paint: 50 g (11) Mixed TDI (toluene isocyanate): 3 g (12) Solvent (60 parts of aromatic mixture (96% of toluene, 4% of xylene), 40 parts of isopropanol ) ... 30 g This was applied to the test piece described above, and was forcedly dried at 50 ° C for 2 hours.

(Application of Second Coating Material) Next, a urethane-curable two-part screen printing ink is mixed with a main liquid and a predetermined amount of a curing agent, and this mixture is diluted with isophorone as a solvent. A second coating was made. An overcoat was applied on the first coating material as the lower layer described above.
After air drying for 1 hour, the masking tape was peeled off, and the film was placed in a hot air oven and cured by heating at 120 ° C. for 2 hours. As the second coating material, a commercially available product was used, and a curing condition in a catalog at 80 ° C. for 30 minutes was used.

The pre-treated test piece is 60 mm × 10 mm
Is injected into an injection mold having a cavity of a size of 30 mm, and an ABS resin (trade name: JSR-ABS: manufactured by Techno Polymer) containing 30% of glass fiber (GF) is injected, and the upper layer of the upper coating material is coated. Was heat-sealed with an ABS resin. In this way, the ABS resin and the test piece were integrally molded, and the ABS resin and the test piece were pulled in opposite directions on the same plane, and the shear bonding strength between the metal piece and the ABS resin portion was measured. In ten samples, the breaking strength averaged 103 Newtons for a contact area of 1.5 cm ² . Therefore, usable mechanical strength was obtained for the structure of the ribs, partitions, and the like of the housing of the electronic device.

Example 2 A test piece made of a magnesium alloy similar to that of Example 1 was coated with the above-mentioned first lower coating material, and dried at 50 ° C. for 2 hours. A commercially available acrylic one-pack screen printing ink (the theoretical melting point of the polymer used was 80 ° C.) was diluted with cyclohexane on the test piece, and the diluted product was overcoated on the first coating material described above. This was further dried at normal temperature and normal pressure, and then placed in a hot air oven and cured by heating at 120 ° C. for 2 hours to complete the pretreatment.

The test piece was inserted into an injection mold having a cavity having a size of 60 mm × 10 mm.
% Glass fiber (GF) was injected, and the nylon resin was heat-sealed to the upper layer of the upper coating material. In this way, the polyamide resin and the test piece were integrally molded, and were pulled in the same manner as in Example 1, and the shear strength was measured. 10
For each sample, the breaking strength averaged 83 Newtons. Therefore, usable mechanical strength was obtained for the structure of the ribs, partitions, and the like of the housing of the electronic device.

Example 3 The above-mentioned first coating material was applied to a test piece made of the same magnesium alloy as in Examples 1 and 2, and dried at 50 ° C. for 2 hours. A coating agent for surface treatment containing a commercially available polyester-based polymer on this test piece (trade name: Toyobo Byron 200: manufactured by Toyobo Co., Ltd.)
Was diluted with isophorone and overcoated as a second coating material. This was dried at room temperature for 1 hour, and then placed in a hot air oven and cured by heating at 120 ° C. for 2 hours to complete the pretreatment.

The pretreated test piece is 60 mm × 10 mm
Is inserted into an injection mold having a cavity of a size, and an ABS resin (trade name: JSR-ABS: manufactured by Techno Polymer) containing 30% of glass fiber (GF) is injected to form an upper layer of the second coating material. The ABS resin was heat-sealed. In this way, the ABS resin and the test piece were integrally molded, and the ABS resin and the test piece were pulled in the same plane direction to measure the integral strength with the metal. In ten samples, the shear fracture strength averaged 127 Newtons. Therefore, usable mechanical strength was obtained for the structure of the ribs, partitions, and the like of the housing of the electronic device.

(Other Embodiments) In the above embodiment, the metal case 6 is a magnesium alloy formed or pressed by injection molding, but the invention is not limited to this. A die-cast product made of aluminum or an aluminum alloy, or a cut material of aluminum, an aluminum alloy, stainless steel, or general steel, or a plate material, a thin plate material, or a sandwich-type laminated material of these materials may be used. .

Further, the metal case 6 is coated with a coating material as a coating material before injection molding or the like. Even if the material is changed, the coating material is not necessarily limited to two layers, but may be one layer. It may be selected depending on the characteristics of the material. The above-mentioned thermoplastic synthetic resin to be injection-molded is, for example, AB mixed with about 25% to 35% of glass fiber (GF), carbon fiber (CF), or the like.
When an S / PC alloy resin or a PC resin is used, the coefficient of thermal expansion is close to that of metal, and the heat distortion during a heat cycle can be reduced, so that the durability of the integrated product can be ensured.

Further, all the structures to be molded are not molded by injection, but are partially molded (may be made of a material different from the resin material) together with a metal case and integrally molded. It may be integrally bonded by a resin or the like.

Further, in the above-described embodiment, the present invention is applied to the housing of a mobile phone. However, the present invention is applicable to information communication devices such as mobile computers, digital cameras and hard disks, and all electronic devices such as home appliances. It goes without saying that the present invention can be applied to a housing.

[0058]

As described above in detail, in the electronic device housing and the method of manufacturing the same according to the present invention, the thermoplastic synthetic resin forming the structure and the metal case are integrally formed without easily peeling off. It is a way to become.

Since only necessary structures are firmly fixed to the metal case, it is possible to economically produce a low-cost electronic device housing which has no problem in shape, structure and mechanical strength. did it.

[Brief description of the drawings]

FIG. 1 is a front view of a portable telephone provided with a housing of the present invention.

FIG. 2 is a cross-sectional view of the case cover when cut along a line II-II in FIG. 1;

FIG. 3 is a sectional view of an injection mold in which a surface of a metal case 6 is filled with a thermoplastic synthetic resin by injection molding.

FIG. 4 is a cross-sectional view showing a metal case and an injection molding die having a structure according to a second embodiment, before filling with a thermoplastic synthetic resin by injection molding.

FIG. 5 is a partial cross-sectional view of a metal case showing a housing of the electronic device according to the third embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Portable telephone device 2 ... Telephone main body 3 ... Case cover 5 ... Push button 6, 12, 20 ... Metal case 7 ... Rib (structure) 11 ... Cavity 10 ... Movable mold plate 15 ... Fixed mold plate 30 ... Epidermis layer

Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court II (Reference) B29K 55:02 B29K 55:02 59:00 59:00 67:00 67:00 69:00 69:00 77:00 77 : 00 B29L 22:00 B29L 22:00 31:34 31:34 F term (reference) 4E360 AA02 AB12 AB42 AB52 EA18 EE03 EE12 EE13 FA08 GA12 GA52 GA53 GB26 GC08 4F206 AA03 AA13 AA20 AA23 AA24 AA28 AA40 AB03 AG03 AG06 AH42 A JB13 JF01 JF05 JL02 JM04 JN11 JQ81

Claims (7)

[Claims] 1. An electronic equipment housing in which a processed metal case and a resin component formed by injection molding on the metal case surface are integrated, a thermoplastic resin injected to constitute the resin component. Is a resin containing an olefin-based resin modified with an unsaturated carboxylic acid or a derivative thereof. 2. The electronic device housing according to claim 1, wherein said resin component is integrally fixed to said metal case by heat fusion. 3. The electronic equipment housing according to claim 1, wherein said olefin resin is α such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene or the like.
-An electronic equipment housing characterized by being a homopolymer of olefin or a copolymer of α-olefins. 4. The electronic device housing according to claim 1, wherein said unsaturated carboxylic acid or its derivative is maleic acid or its anhydride. 5. The electronic device housing according to claim 1, wherein said resin component is a structural portion for mechanical element functions such as screws, claws, ribs, and bosses. body. 6. A method of manufacturing an electronic device housing including a metal case, the method comprising: inserting the metal case into an injection mold; and performing the injection molding to form a resin part integrated with the metal case. Injecting into a mold one or more thermoplastic resins selected from polyamide resin (PA), polyacetal (POM), polycarbonate (PC), polyester resin and ABS resin containing the modified α-olefin resin of claim 1 And a method of manufacturing an electronic device housing. 7. The method for manufacturing an electronic device casing according to claim 6, wherein the amount of the modified α-olefin resin contained in the thermoplastic resin is 5 to 100%. Manufacturing method.