JP2002344187A - Method of manufacturing gasket of electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a gasket which has a high sealing performance and surely enables to prevent malfunctions of electronic equipments caused by external noise. SOLUTION: On the surface of one of a pair of conductive metal members which constitute an electronic equipment storing case, a liquid rubber material which is hardened by irradiation of active energy beams is attached. Then, the attached rubber material is irradiated with active energy beams to be hardened into a predetermined hardness. Next, the surface of the hardened rubber material is covered with a film formed of a conductive metal material extended to the surface of the other member. Consequently, the electrical continuity is established between the pair of members constituting the electronic equipment storing case, and a space between these members is electromagnetically sealed, thereby increasing the electromagnetic shielding effect of the electronic equipment storing case and preventing malfunctions of electronic equipments due to external noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a gasket used for sealing an electronic device storage case, and more particularly, to a method of electrically connecting a pair of members constituting an electronic device storage case while sealing the members. The present invention relates to a method of manufacturing an improved gasket so as to improve the electromagnetic shielding effect of an electronic device storage case by preventing the electronic device from being malfunctioned by external noise.

[0002]

2. Description of the Related Art In recent years, electronic devices such as notebook personal computers, mobile phones, and digital cameras are often taken outdoors. At this time, when foreign substances such as moisture, dust, and various floating gases contained in the air enter the inside of the electronic device, they impede the operation of these electronic devices or cause deterioration of electrical insulation, thereby causing a malfunction. Probability is high. Therefore, these electronic devices are completely sealed with a gasket after being housed in a conductive metal case so that foreign substances existing in the outside do not enter.

[0003]

By the way, foamed elastomer, which is one of the materials used for such a gasket, has a low rubber hardness, so that it has a high conformability to the shape of the electronic device storage case and has excellent sealing properties. It does not have conductivity.

Fluoro rubber has a rubber hardness of JIS-A
Therefore, it is necessary to increase the rigidity of the electronic device storage case because it is as high as about 60 degrees, and it is not suitable for an electronic device in which the case is formed to be thin in size and light weight, and does not have conductivity.

Therefore, when a gasket made of these rubber materials is used to seal a pair of members constituting an electronic device housing case, these members are electrically insulated from each other, and the electromagnetic shielding effect of the entire case is reduced. Therefore, the electronic device may malfunction due to external noise. In particular, recent electronic devices are becoming smaller and lighter and have more functions, and their structures are complicated, so that malfunctions due to external noise are likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a gasket which solves the above-mentioned problems of the prior art and has a high sealing property and can reliably prevent malfunction of electronic equipment due to external noise. It is in.

[0007]

According to a first aspect of the present invention, there is provided a method of manufacturing a gasket for an electronic device, comprising the steps of: forming a gasket for sealing between a pair of conductive metal members constituting an electronic device storage case; In a manufacturing method, a liquid rubber material that is cured by irradiation with an active energy ray is attached to the surface of one of the pair of members, and then the applied rubber material is irradiated with the active energy ray. Curing the rubber material to a predetermined hardness, and then covering the surface of the cured rubber material with a coating of a conductive metal material extending to the surface of the one member. Preferably, the film is formed by laminating films of different conductive metal materials.

That is, in the method of manufacturing a gasket for an electronic device according to the present invention, for example, a liquid rubber material is discharged from a nozzle of a coating robot to form a surface of one of a pair of members constituting an electronic device storage case. After attaching to
The attached rubber material is irradiated with an active energy ray such as an ultraviolet ray or an electron beam to have a predetermined hardness, preferably 2 JIS-A.
Cure to a low rubber hardness of 0-50 degrees. This allows
The hardness of the rubber material is low, the followability to a pair of members constituting the electronic device storage case is high and the sealing performance is excellent, and it is not necessary to increase the rigidity of these members. A gasket that has good deformation recovery and can be used repeatedly can be easily and inexpensively manufactured. Further, the method of manufacturing a gasket for an electronic device according to the present invention covers the surface of a rubber material cured by a coating of a conductive metal material extending continuously to the surface of one member. Accordingly, when the gasket manufactured according to the present invention seals a pair of members constituting the electronic device storage case, the members can be electrically connected to each other, and the gap between these members can be electromagnetically controlled. Since the electronic device can be hermetically sealed, it is possible to enhance the electromagnetic shielding effect of the electronic device storage case and prevent malfunction of the electronic device due to external noise. Furthermore, if the film formed on the surface of the cured rubber material is formed by laminating films of different conductive metal materials on each other, the usage environment of the gasket, the material of the electronic device storage case, and the product function of the electronic device using the gasket An optimum gasket can be manufactured according to the conditions. Therefore, according to the method of manufacturing a gasket for an electronic device according to the present invention, it is possible to manufacture a gasket having high sealing properties and capable of reliably preventing malfunction of the electronic device due to external noise.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a gasket for electronic equipment according to the present invention will be described with reference to FIGS. 1 to 4 in which a hard disk drive (HDD) as a storage device of a computer is sealed. The case will be described as an example.

In the method of manufacturing a gasket for an electronic device according to this embodiment, a dust cover (one member) 1 constituting an HDD storage case is placed on a horizontal table 2 as shown in FIG. A liquid rubber material 5 is discharged from the nozzle 4 of the YZ axis coating robot 3 and adheres to a predetermined position on the surface of the dustproof cover 1. At this time, it is preferable that the cross-sectional shape of the rubber material 5 adhered to the surface of the dust cover 1 is a shape as shown in FIG.

The rubber material 5 is not particularly limited as long as it causes a curing reaction when irradiated with active energy rays such as ultraviolet rays and electron beams. For example, an oligomer having a polymerizable carbon-carbon double bond at the end of a polymer chain,
It may be composed of a low-molecular compound having at least one polymerizable carbon-carbon double bond in the molecule.

As the photopolymerizable oligomer as described above, generally, polyester acrylate, urethane acrylate, epoxy acrylate, polybutadiene acrylate, silicon acrylate and the like can be mentioned. As a photopolymerizable low molecular weight compound used as a crosslinking agent or a diluent, alkyl acrylate or methacrylic acid ester of acrylic acid or methacrylic acid is used as monoacrylate, and acrylic acid or methacrylic acid is used as polyvalent acrylate. An ester compound with a hydric alcohol can be exemplified.

When ultraviolet irradiation is used as a means for curing the liquid rubber material 5, a photopolymerization initiator such as benzoin ether, benzyldimethyl ketal, α-hydroxyalkylphenone, α-aminoalkylphenone is added.

Next, the rubber material 5 adhered to the surface of the dustproof cover 1 is irradiated with ultraviolet rays to be hardened to a hardness of 20 to 50 degrees according to JIS-A specified in 5.2 of JIS K6301. The cured rubber material 5 may be subjected to a high-temperature treatment as necessary to remove volatile components contained in the rubber material 5.

Thereafter, the surface of the hardened rubber material 5 on the dustproof cover 1 is formed by CVD (chemical vapor deposition) or PVD (physical vapor deposition) as shown in FIG.
Films 6 and 7 of a conductive metal material having a thickness of about one micron are sequentially formed and laminated on each other, and the rubber material 5 is completely covered to complete the gasket 8.

The conductive metal material for forming the coatings 6 and 7 is the most suitable material according to the use environment of the gasket 8, the material of the mating member to be sealed, and the product function of the electronic device using the gasket 8. However, for example, copper can be used to form the coating 6 and aluminum can be used to form the coating 7.

After manufacturing the gasket 8 on the surface of the dust-proof cover 1, as shown in FIG. 4, the dust-proof cover 1 and the main body container 9 constituting the case for accommodating the HDD 10 are assembled to form the dust-proof cover 1 The space between the container 9 and the container 9 can be sealed by the gasket 8.

At this time, the hardness of the portion of the rubber material 5 constituting the gasket 8 is set to a low value of 20 to 50 degrees according to JIS-A.
And the sealing performance is excellent, and it is not necessary to increase the rigidity of the dustproof cover 1 and the main body container 9. Further, the gasket 8 can be used repeatedly since the deformation recovery from the compressed state is good for a long period of time.

The conductive metal films 6 and 7 formed on the surface of the rubber material 5 completely cover the cured rubber material 5 and extend continuously to the surface of the dustproof cover 1. As a result, the dustproof cover 1 is
Can be electrically connected to each other, and the gap between the dust-proof cover 1 and the main body container 9 can be electromagnetically sealed. Therefore, the effect of electromagnetically shielding the HDD 10 is enhanced, and the external noise is reduced. A malfunction of the HDD 10 can be prevented.

Therefore, according to the method of manufacturing a gasket for an electronic device of the present embodiment, it is possible to manufacture the gasket 8 having high sealing properties and capable of reliably preventing the malfunction of the HDD 10 due to external noise.

As described above, one embodiment of the method of manufacturing a gasket for precision equipment according to the present invention has been described in detail. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. Needless to say. For example, in the embodiment described above, the coating covering the surface of the rubber material 5 is replaced with the coatings 6, 7 of different conductive metal materials.
Are laminated on each other, but only one of the coatings 6 and 7 can be formed.

[0022]

As is clear from the above description, according to the present invention, the hardness of the rubber material portion is low, the followability to the shape of the electronic device storage case is high, the sealing performance is excellent, and the electronic device storage case is improved. There is no need to increase rigidity,
Further, a gasket which has good deformation recovery from a long-term compressed state and can be used repeatedly can be easily and inexpensively manufactured. Further, since the surface of the rubber material portion is covered with a coating of a conductive metal material extending continuously to the surface of the one member on which the rubber material portion is formed, when a pair of members constituting the electronic device storage case are assembled together, these members are assembled. Since the members can be electrically connected to each other and the gap between these members can be electromagnetically sealed, the electromagnetic shielding effect of the electronic device storage case is enhanced, and malfunction of the electronic device due to external noise is prevented. can do.

[Brief description of the drawings]

FIG. 1 is a side sectional view schematically showing a state in which a liquid rubber material is adhered to a contact surface.

FIG. 2 is a sectional view showing a state where a rubber material is cured.

FIG. 3 is a cross-sectional view showing a state where the surface of a cured rubber material is covered with a film of a resin material laminated thereon.

FIG. 4 is an exemplary exploded perspective view showing an electronic device using the gasket;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dustproof cover 2 Horizontal table 3 XYZ axis application robot 4 Nozzle 5 Rubber material 6,7 Coating 8 Gasket 9 Main body container 10 HDD (electronic equipment)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H05K 5/04 H05K 5/04 5/06 5/06 DF term (Reference) 4E360 AB33 BA03 EA18 EA21 EE13 EE15 GA22 GA29 GA34 GB01 GB26 GB43 GB46 GC04 GC08 GC16 4H017 AA03 AB01 AC08 AC10 AD02 AE04 5E321 AA03 BB23 BB44 GG05 GH07

Claims (2)

[Claims] 1. A method for manufacturing a gasket for sealing between a pair of conductive metal members constituting an electronic device housing case, comprising: a liquid rubber material which is cured by irradiation with an active energy ray; After adhering to the surface of one member, the applied rubber material is irradiated with the active energy ray to cure the rubber material to a predetermined hardness, and then the surface of the cured rubber material is contacted with the one of the one material. A method of manufacturing a gasket for electronic equipment, comprising covering with a film of a conductive metal material extending to a surface of a member. 2. The method according to claim 1, wherein the film is formed by laminating films of different conductive metal materials.