JPH05315765A - Housing waterproof structure for electronic device - Google Patents

Abstract

PURPOSE:To practically realize a waterproofing housing for a small-sized light- weight electronic device by providing holes to be engaged with protrusions of a lower cover at a predetermined interval, and providing a packing having a flat upper part, and a lower part to be engaged with a rising stairlike steps of the lower cover to cover an upper inside of the cover. CONSTITUTION:A packing 14 is formed of an elastic material such as rubber, etc., and has a flat upper side 18, and a recess 16 to be engaged with a step 12 of a lower cover 10 at a lower side. Holes 15 for allowing protrusions 13 of the cover 10 to protrude at a predetermined interval are opened. After the packing 14 is mounted on the cover 10, an upper cover 9 is brought into contact therewith. Then, a step 11 of the cover 9 is brought into contact with an upper side of the packing 14. Further, when the step 11 of the cover 9 is pressurized until the inside of the step 11 is brought into contact with the protrusion 13 of the cover 10, the packing 14 is deformed by the step 11 of the cover 9 by pressurizing, thereby generating a waterproofing effect.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable electronic device such as a portable communication device such as a cordless telephone or a portable information processing device such as a notebook personal computer, which is used for outdoor use. Body waterproof structure.

When an electronic circuit of an electronic device is wetted with moisture or splashed with water, a short circuit occurs or dielectric breakdown occurs, which causes a failure. In addition, the insulation resistance of the electronic components forming the electronic circuit is also reduced, and the deterioration is accelerated.

For these reasons, it is necessary to take a waterproof structure for electronic devices used outdoors. Further, it is necessary to provide a shield for a device used at a high frequency to prevent unnecessary electric waves generated from an electronic circuit from leaking to the outside.

The present invention relates to a waterproof structure for a casing, which has a waterproof structure to protect internal equipment and a shield structure.

[0005]

2. Description of the Related Art As an entry port for moisture and water to an electronic device having a housing structure, there are an opening portion of a cover, a sliding portion such as a switch, a fitting portion between the cover and the like. It is necessary to use packing to completely shield the inside of the device from the outside.

FIG. 4 shows a waterproof structure of a cover and a cover which have been conventionally used. An upper cover 1 having a convex cross-sectional shape and a concave cross-sectional shape are provided, and an elastic tube 3 is provided in the concave portion. It is composed of the inserted lower cover 2, and before fitting, the waterproof tube 3 has a waterproof effect by crushing a circular elastic tube 3.

Also, in FIG. 5, the upper cover 4 is flat,
The lower cover 5 has a stepped portion 6 having an upward staircase toward the inside, and shows a case where a packing 7 having a depressed central portion is used between them.

That is, the packing 7 is fixed by fitting the stepped portion 6 of the lower cover 5 into the concave portion of the packing 7, and the waterproof effect is produced by pressing the upper cover 4 onto the packing 7 having rubber elasticity. I am letting you.

However, the necessary condition for the housing of an electronic device with a high frequency of use is to waterproof and metallize the inside of the housing by a treatment such as plating to provide a shielding effect, in which case the upper cover and the lower cover are brought into conduction. Although it is necessary to hold it, the structure of FIG. 4 satisfies this condition, and the structure of FIG. 5 is insulated by the packing 7 and therefore does not serve this purpose.

Further, the structure of FIG. 5 has a problem that the packing 7 is likely to come off from the lower cover 5 when a force is carelessly applied to the packing 7. On the other hand, in order to obtain the structure shown in FIG. 4, at least 1 mm is required for the thickness of the concave or convex portion and the flat portion sandwiching the concave or convex portion, and the total thickness is 3 mm or more. There is a problem that it is difficult to make the body smaller and lighter.

[0011]

SUMMARY OF THE INVENTION As a waterproof casing for an electronic device having a high frequency of use, the inventors want to make the mold thickness as thin as possible (2 mm or less) to reduce the size and weight. I want to maintain the continuity between the upper cover and the lower cover. I want to fix the packing in the cover without using adhesive. Was set as a necessary condition, but the conventional structure is unsuitable.

[0012] Therefore, it is a problem to put a waterproof casing which satisfies this condition into practical use.

[0013]

Means for Solving the Problems The above-mentioned problems are solved by an upper cover having an ascending stepped portion on the inside and an ascending stepped portion on the inside, and a convex portion having a higher height at the stepped portion with a predetermined gap. And a lower cover having a hole to which the convex portion of the lower cover fits at a predetermined interval, the upper part is flat, and the step-like steps of the lower cover fit in the lower part, and
This can be achieved by a waterproof structure for the casing of the electronic device, which is characterized in that it comprises a packing covering the upper inside of the lower cover.

[0014]

The present inventors have a method for satisfying the above conditions,
The upper cover has a stepped part with the tip shape facing inward, and the lower cover has a stepped part with the tip step facing inward. Structure with a much higher convex portion,
As a packing structure, the protrusions of the lower cover are provided with holes at predetermined intervals, the upper part is flat, the step-like steps of the lower cover are fitted on the lower part, and the inside of the upper part of the lower cover is The structure that covers the.

FIG. 1 is a perspective view showing the structure of a case embodying the present invention. (A) is an upper cover, (B) is a packing, (C) is a lower cover, and (D) is a lower cover. It shows a state in which the upper cover is brought closer after being inserted.

That is, the joints between the upper cover 9 and the lower cover 10 are both inwardly stepped stepped portions 1
The lower cover 10 is provided with a higher convex portion 13 at the joint portion.

The packing 14 has a flat upper surface, but is provided with a hole 15 through which the convex portion 13 of the lower cover 10 comes out, and a lower surface is provided with a concave portion 16 into which the step portion 12 of the lower cover 10 is fitted. ing.

Then, as shown in FIG. 3D, when the packing 14 is aligned with the lower cover 10 and pressure-bonded thereto, the convex portion 13 of the lower cover 10 comes out from the hole 15 of the packing 14 and is fixed. Further, since the convex portion 13 directly contacts the upper cover 9, conduction is ensured.

The packing 14 is pressed by the step portions 11 and 12 of the lower cover 10 and the upper cover 9 to produce a waterproof effect. 2 is a cross-sectional view of the packing according to the present invention, and FIG. 3 is a cross-sectional view showing a state in which the upper cover is pressed against the lower cover in which the packing is inserted.

That is, the packing 14 according to the present invention is made of an elastic material such as rubber, the upper side 18 is flat, and the lower side has a recess 16 into which the step portion 12 of the lower cover 10 is fitted,
In addition, holes 15 are formed at regular intervals so that the protrusions 13 of the lower cover 10 project.

After the packing 14 is attached to the lower cover 10, as shown in FIG.
First, the stepped portion 11 of the upper cover 9 hits the upper side of the packing 14, but when the inner side of the stepped portion 11 of the upper cover 9 comes into contact with the convex portion 13 of the lower cover 10, the stepped portion of the upper cover 9 is pressed. As shown in the figure, the packing 14 is deformed by the pressure due to the pressure 11, which causes a waterproof effect and ensures waterproofness.

By adopting such a structure, it is possible to satisfy both conditions of shielding and waterproofing.

[0023]

EXAMPLE An ABS resin (acrylonitrile-butadiene-styrene copolymer) was used to form an upper cover (FIG. A) and a lower cover (FIG. C) having the shapes shown in FIG.

Here, the thickness of the cover was set to 2 mm, electroless plating of nickel (Ni) was performed to provide metallization layers on the front and back surfaces of the cover, and then the outer surface of the cover was painted. ..

Here, the center interval of the convex portions 13 provided on the step portion 12 of the lower cover 10 is obtained from the frequency of the radiation noise assumed from the harmonic frequency of the clock of the system used.
It was set to 20 mm.

Further, the upper cover 9 and the lower cover 10
In order to ensure contact with the upper cover 9, a semicircular protrusion 18 is provided on the contact surface of the upper cover 9. Further, the lower cover 10 is pre-molded with a support 19 for ensuring the retention of the packing 14.

The packing 14 is made of neoprene rubber. As a result, we were able to satisfy both the requirements of confining and shielding unnecessary radio waves generated from electronic devices and completely waterproofing.

[0028]

By implementing the present invention, it is possible to put a small-sized and lightweight waterproof casing for an electronic device into practical use, thereby improving the reliability of the electronic device.

[Brief description of drawings]

FIG. 1 is a perspective view of a housing in which the present invention is implemented.

FIG. 2 is a sectional view of a packing according to the present invention.

FIG. 3 is a cross-sectional view showing a pressed state of packing.

FIG. 4 is a cross-sectional view showing a conventional waterproof structure for a housing.

FIG. 5 is another cross-sectional view showing a conventional waterproof structure for a housing.

[Explanation of symbols]

 9 Upper cover 10 Lower cover 11, 12 Step 13 Protrusion 14 Packing 15 Hole 16 Recess

Claims (1)

[Claims] 1. An upper cover (9) having an inwardly stepped step (11) toward the inside, and an upwardly stepped step (12) toward the inward, the stepped part having a predetermined gap. Lower cover (10) having a higher protrusion (13) in (12) and holes (15) into which the protrusions (13) of the lower cover (10) fit are provided at predetermined intervals, and the upper side ( 18) is flat, and the lower cover is fitted with the step-like step portion (12) of the lower cover (10), and the upper cover of the lower cover (10) is covered with a packing (14). A waterproof structure for a casing of an electronic device.