JP3243170B2 - Housing for electronic equipment with shield function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a housing having a shielding function, which is used as a housing of electronic equipment such as a personal computer.

[0002]

2. Description of the Related Art As an electronic device, for example, a personal computer has a housing formed of a synthetic resin or the like.
Inside, a printed circuit board on which electronic components are mounted, a memory device, and the like are housed. Such a housing is provided with a shield structure for shielding electromagnetic noise from entering the inside and at the same time, for preventing leakage of the electromagnetic noise from the inside.

[0003] As a shield structure, generally, a shield layer formed by laminating conductive coating, copper plating, nickel plating or the like on the inner surface of a housing is widely used. On the other hand, since the housing of an electronic device accommodates various electronic components therein, it is formed by dividing into a plurality of portions, for example, a base portion and a cover, and these are separably connected. It is constituted by doing. As a connection method, screwing or fitting using an elastically deformable engaging claw is known. Particularly in recent years, in order to improve manufacturing efficiency, a connecting method using a fitting claw is widely used. It's being used.

[0004] In the case of the connection method by fitting, for example, an engaging claw protruding from the inner surface of the base portion and an engaging claw protruding from the cover are fitted to each other, so that the cover is attached to the base portion. Are fitted and fixed. Then, in order to enhance the shielding function of the housing, a shield layer is also formed on the surface of these engagement claws.

[0005]

When the housing is connected using the above-mentioned engaging claws, one pair of engaging claws engages with each other. It is elastically deformed while sliding, and fits over the other engaging claw.

However, when one of the engaging claws climbs over the other engaging claws while sliding on the other engaging claws, the shield layers formed on the surfaces of these engaging claws rub against each other, and the engaging claws of the engaging claws come into contact with each other. May peel off from the surface. In this case, the shielding function at the portion where the shield layer has been peeled off is reduced, which causes intrusion or leakage of electromagnetic noise.

[0007] The shield layer peeled off from the engaging claws has conductivity, and a circuit such as a printed circuit board is usually provided inside the housing. Therefore, when the shield layer peeled off from the engagement claws falls on the printed circuit board, it may come into contact with the circuit and cause a short circuit.

As described above, there is a problem that the reliability of the entire electronic device is reduced due to peeling of the shield layer. The present invention has been made in view of the above points, and an object of the present invention is to provide a housing for an electronic device with improved reliability by preventing peeling of a shield layer.

[0009]

In order to achieve the above object, a housing according to the present invention has a first engagement portion having a first engagement portion.
And a second housing portion having a second engagement portion engageable with the first engagement portion, and an inner surface of the first and second housing portions, In addition, a shield layer is formed on the surface of the first and second engaging portions, and at least one of the sliding contact portions of the first and second engaging portions that slides with each other at the time of engagement is provided with the shield layer. It is applied over the shielding layer sheet
It is characterized in that a lubricant layer for preventing peeling of the mold layer is formed.

According to the present invention, molybdenum disulfide or ethylene tetrafluoride is used as the lubricant. Further, according to the present invention, when forming the shield layer on both the inner surface and the outer surface of the housing, the shield layer is formed by laminating a copper plating layer and a nickel plating layer. When the shield layer is provided only on the inner surface of the housing, the shield layer is formed by sequentially laminating a conductive coating layer, a copper plating layer, and a nickel plating layer on the inner surface of the housing.

According to the housing configured as described above, the lubricant is applied to at least one of the first and second engagement portions and the sliding contact portion. When the first engaging portion and the second engaging portion are engaged at the time of assembling, these engaging portions are smoothly engaged with a small sliding resistance by the action of the lubricant. As a result, peeling of the shield layer at the sliding contact portion between the first and second engaging portions is prevented.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 show an embodiment in which a housing according to the present invention is applied as an electronic device to, for example, a display device of a portable personal computer.

The display device 10 includes, for example, a flat rectangular housing 12 formed of a synthetic resin, for example. The housing 12 includes a rectangular base portion 14 having a side wall erected along the side edge, and a rectangular cover portion 16 having a side wall erected along the side edge. The base portion and the cover portion function as first and second housing portions, and form a housing by fitting together. The cover 16 has a rectangular opening 20 formed therein.

In the housing 12, a rectangular liquid crystal display panel 22, which is disposed opposite the cover 16, a plurality of drive units 24 each having a circuit board, a fluorescent lamp 26 functioning as a backlight, and a fluorescent lamp And an inverter unit 28 for driving the power supply.

As shown in FIG. 3, the base portion 14 and the cover portion 16 are provided with engaging claws for fitting and fixing them to each other. In detail, the base unit 14
A first engaging claw 30 functioning as a first engaging portion is protruded from a predetermined portion of the inner surface of the side wall. Each of the first engaging claws 30 is formed in a rectangular parallelepiped shape, and an upper end portion thereof is formed with an inclined surface 30a inclined toward a side wall.

The lower end of the side wall of the cover 16 has a second
A plurality of second engaging claws 32 functioning as engaging portions are provided to protrude, and are arranged at portions corresponding to the first engaging claws 30. As shown in FIGS. 3 and 4, each of the second engaging claws 32 is formed at the extended end thereof, and
And an inclined surface 32 facing the inclined surface 30a, and a stepped portion 32b to be hooked on the first engaging claw, and formed to be engageable with the first engaging claw.

When assembling the display device 10, the base 1
When the cover 4 and the cover 16 are connected to each other, as shown in FIG. 3, the cover 14 is attached to the base 14 such that the second engagement claws 32 face the first engagement claws 30, respectively. 16 is positioned, and the cover is pressed against the base. Then, as shown in FIG. 5, the second engagement claw 32
The first engaging claw 30 descends while sliding on the surface of the first engaging claw 30 according to the inclined surfaces 30a and 32a, and climbs over the first engaging claw while being elastically deformed. Thereby, the step portion 32b is hooked on the lower end of the first engagement claw 30, and the second engagement claw 32 is
Is fitted with the engaging claw 30. Therefore, the base 12 and the cover 16 are connected to form the housing 12.

The base portion 14 and the cover portion 16
After being fitted to each other using the first and second engagement claws 30, 32, they are screwed together by a plurality of screws 40, as shown in FIG.

As shown in FIG. 6, a shield layer 42 is formed on the entire inner surface of the base portion 14 and the inner surface of the cover portion 16. The shield layer 42 includes a conductive coating layer 44, a copper plating layer 45, and a nickel plating layer 46.
Are sequentially laminated. For the conductive coating layer 44, for example, a conductive coating containing cyan, silver, or the like is used.

As shown in FIGS. 3, 4, and 7, a shield layer 42 similar to the above is formed on the outer surfaces of the first and second engaging claws 30, 32. Further, the sliding contact portions of the first and second engaging claws 30, 32, which are indicated by dots in FIGS. 3 and 4, that is, the portions that rub against each other when these engaging claws are engaged with each other, , A lubricant is applied on the shield layer 42 to form a lubricant layer 50. As the lubricant, for example, a solvent obtained by diluting molybdenum disulfide with isopropanol at a weight ratio of 1: 3 is used. In addition, since molybdenum disulfide is colored (gray), the presence or absence of application can be easily visually recognized.

According to the housing 12 of the display device 10 configured as described above, the lubricant layer 50 is formed on the sliding contact portion between the first and second engaging claws 30 and 32, so that the sliding contact portion is formed. Slidability and lubricity are improved. Therefore, the housing 12
Even when the sliding portions of the first and second engaging claws 30 and 32 rub against each other at the time of assembling, the peeling of the shield layer 42 from the sliding contact portions of these engaging claws can be prevented.

Accordingly, it is possible to provide the housing 12 having excellent shielding properties, and to reliably prevent the intrusion or leakage of electromagnetic noise. Further, since the peeling of the shield layer 42 can be prevented, it is possible to avoid the possibility that the peeled shield layer falls on a circuit board or the like in the housing 12 to short-circuit the circuit. For these reasons, a highly reliable housing can be provided.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the lubricant is not limited to molybdenum disulfide, and another lubricant obtained by diluting ethylene tetrafluoride with a thinner or the like may be used.

In the above embodiment, the shield layer is provided only on the inner surface side of the housing. However, the shield layer may be formed on both the inner surface and the outer surface of the housing. In this case, the conductive coating layer for forming the plating layer can be omitted.

Further, the lubricant is not limited to be applied to both the sliding portions of the first and second engaging claws. If the lubricant is applied to at least one sliding portion of the engaging claws, Lubricity is improved, and peeling of the shield layer can be prevented. The first and second engaging portions are not limited to the above-described claw shape, and the present invention can be applied to any shape in which the first and second engaging portions come into sliding engagement with each other and then engage with each other.

[0026]

As described above in detail, according to the present invention, the peeling of the shield layer at the sliding contact portions of the engaging portions engaged with each other.
By applying a lubricant for preventing the occurrence of the above problem, it is possible to prevent the shield layer from peeling off at the time of assembly, and to provide a highly reliable housing for electronic devices.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a display device including a housing according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the display device.

FIG. 3 is an exploded perspective view showing, on an enlarged scale, an engagement portion of a housing of the display device.

FIG. 4 is a perspective view showing a second engagement claw of the housing.

FIG. 5 is a sectional view showing an engaged state of first and second engaging claws during the assembly of the housing.

FIG. 6 is a sectional view showing a shield layer of the housing.

FIG. 7 is a sectional view showing a shield layer and a lubricant layer of the first and second engagement claws.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Housing 14 ... Base part 16 ... Cover part 30 ... First engagement claw 32 ... Second engagement claw 42 ... Shield layer 44 ... Conductive coating layer 45 ... Copper plating layer 46 ... Nickel plating layer 50 ... Lubrication Agent layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H05K 9/00 H05K 5/02

Claims (3)

(57) [Claims] A first housing portion having a first engagement portion; and a second engagement portion engageable with the first engagement portion. The fitted second housing part, the inner surfaces of the first and second housing parts, and the shield layers formed on the surfaces of the first and second engagement parts, An electronic device, comprising: a lubricant layer that is applied on the shield layer so as to prevent peeling of the shield layer on at least one of the sliding contact portions of the first and second engagement portions that are in sliding contact with each other. Housing for 2. The electronic device casing according to claim 1, wherein the lubricant layer contains molybdenum disulfide or ethylene tetrafluoride. A first housing portion having a first engagement portion; and a second engagement portion engageable with the first engagement portion.
A second housing fitted into the first housing, inner surfaces of the first and second housings, and the first and second housings.
A shield layer formed on the surface of the first and second engagement portions, and a shield layer formed on the surface of the first and second engagement portions, which are in sliding contact with each other at the time of engagement.
At least one of the sliding parts is applied over the shield layer.
A lubricant layer coated thereon, wherein the lubricant layer is formed of molybdenum disulfide or tetrafluoroethylene.
A housing for electronic equipment characterized by containing styrene
Body .