JPH0963392A - Portable terminal case drip-proof structure - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a highly reliable case drip-proof structure for a mobile terminal device without causing a case to warp. In a case drip-proof structure of a mobile terminal device configured by fixing an upper case and a lower case to each other, an annular elastic body having an annular groove at a peripheral end of one of the cases is integrally formed by molding. An annular protrusion having a substantially triangular cross section is integrally formed at the peripheral end of the other case, and the annular protrusion is inserted into the annular groove to fix the upper case and the lower case to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case drip-proof structure for a portable terminal device such as a handheld terminal (HHT) and a portable telephone.

Since the portable terminal device is inevitably used outdoors, a reliable drip-proof structure for preventing rain and the like from entering the device is required.

[0003]

2. Description of the Related Art FIG. 2 shows a sectional view of a conventional case drip-proof structure. The O-ring 6 is fitted in the annular groove of the lower case 2, and the lower case 2 and the upper case 4 are fixed so that the tip 4a of the upper case 4 presses the O-ring 6.

FIG. 3 is a sectional view of another conventional example, in which a convex packing 6'is fitted in the annular groove of the lower case,
The lower case 2 and the upper case 4 are fixed to each other so that the packing 6'is pressed by the tip portion 4a of the upper case 4.

Still another conventional example disclosed in Japanese Utility Model Laid-Open No. 4-15880 will be briefly described with reference to FIG. As shown in FIG. 4 (A), a concave packing 8 is fitted into the tip of the lower case 2. The packing 8 is shown in FIG. 4 (B).
Has a cross-sectional shape as shown in FIG. The bottom surface 8b of the recess 8a has a raised shape.

When the tip portion 4a of the upper case 4 is inserted into the recess 8a of the packing 8 and the lower case 2 and the upper case 4 are screwed together, the tip portion 4a of the upper case 4 becomes the bottom surface 8b of the recess.
By pressing, both side portions of the packing 8 fall inward and come into contact with the side surface of the tip portion 4a of the upper case 4, so that the inside of the case can be sealed.

[0007]

In any of the conventional structures described above, the tip of the upper case is strongly pressed against the packing accommodated in or attached to the lower case, and the lower case 2 and the upper case 4 are fixed with the screw 10. Therefore, a vertical force F is applied to the lower case 2 and the upper case 4 as shown in FIG.

As a result, the case is warped and the drip-proof structure becomes insufficient. In order to prevent this, it is necessary to increase the case strength by increasing the thickness of the case.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a highly reliable case drip-proof structure for a portable terminal device without causing warping of the case. Is.

[0010]

According to the present invention, in a case drip-proof structure for a portable terminal device, which is constructed by fixing an upper case and a lower case to each other, an annular groove is provided at a peripheral end of one of the cases. The annular elastic body having is integrally molded by a mold, and an annular protrusion having a substantially triangular cross section is integrally formed at the peripheral end of the other case, and the annular protrusion is inserted into the annular groove to form an upper case and a lower case. There is provided a case drip-proof structure for a mobile terminal device, wherein the case and the case are fixed to each other.

[0011]

Since the annular projection is formed in a substantially triangular shape in cross section, when the upper case and the lower case are fixed to each other, the annular elastic body is mainly deformed in the horizontal direction by being pushed by the annular projection, and the annular groove is annular. Blocked by protrusions.

Since the annular elastic body does not receive much vertical force, the upper case and the lower case can be fixed to each other with a small force. Since a vertical force is not generated much when the case is fixed, warping of the case is also prevented. As a result, it is possible to provide a highly reliable case drip-proof structure for a mobile terminal device.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 (A) shows a sectional view of an embodiment of the present invention, and FIG. 1 (B) shows a sectional view of an essential part of the embodiment.

An annular elastic body 1 is provided at the peripheral edge of the upper case 14.
6 is integrally molded by molding (different material composite molding). The annular elastic body is preferably made of an elastomer such as polyurethane. The annular elastic body 16 is the annular groove 1
Have 7.

In order to improve the adhesiveness between the annular elastic body 16 and the upper case 14, a convex portion 18 is formed on the annular elastic body 16, and the convex portion 18 is embedded in the upper case 14 to be integrally molded. Is desirable.

On the other hand, an annular protrusion 20 having a substantially triangular cross section is formed at the peripheral edge of the lower case 12. FIG.
As shown in (B), the annular groove 17 of the annular elastic body 16 in which the annular protrusion 20 of the lower case 12 is integrally formed with the upper case 14.
When the lower case 12 and the upper case 14 are inserted into each other and fastened to each other with screws (not shown), a horizontal force F is mainly applied to the annular elastic body 16 and the annular elastic body 16 is deformed much in the vertical direction. It is pushed by the annular projection 20 without being deformed mainly in the horizontal direction.

By closing the annular groove 17 with the annular protrusion 20, it is possible to achieve the drip-proof of the case. It is preferable that the upper case and the lower case have a dimensional relationship such that the tops of the annular protrusions 20 do not come into contact with the bottom surface 17a of the annular groove 17 when they are fixed to each other.

According to the present embodiment, the annular elastic body 16 is not vertically pressed to obtain a drip-proof structure as in the conventional case, but the annular elastic body 16 is mainly deformed in the horizontal direction to prevent the case. Since the droplet structure is obtained, it is possible to effectively close the annular groove 17 with a small force. Further, since the upper case 14 and the annular elastic body 16 are integrally formed, the upper case 1
No extra force is required to close the gap between 4 and the annular elastic body 16.

In the above-described embodiment, the annular elastic body 16 is integrally formed on the upper case 14, but the present invention is not limited to this, and the annular elastic body 16 is integrally formed on the lower case 12, An annular protrusion may be formed on the upper case 14.

[0020]

Since the present invention is configured as described in detail above, it is possible to provide a highly reliable case drip-proof structure for a portable terminal device without warping the case.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is a sectional view of another conventional example.

FIG. 4 is a sectional view of still another conventional example.

FIG. 5 is a diagram illustrating a problem of the conventional example.

[Explanation of symbols]

 12 lower case 14 upper case 16 annular elastic body 17 annular groove 20 annular protrusion

Claims (3)

[Claims] 1. In a case drip-proof structure of a mobile terminal device configured by fixing an upper case and a lower case to each other, an annular elastic body having an annular groove is integrally formed by molding at a peripheral end of one of the cases. In addition, an annular protrusion having a substantially triangular cross-section is integrally formed at the peripheral end of the other case, and the annular protrusion is inserted into the annular groove to fix the upper case and the lower case to each other. A portable terminal device case with a drip-proof structure. 2. The case-drip-proof structure for a mobile terminal device according to claim 1, wherein the annular elastic body is formed of an elastomer. 3. The case protection device for a mobile terminal device according to claim 1, wherein when the upper case and the lower case are fixed to each other, the top portion of the annular protrusion does not come into contact with the bottom surface of the annular groove. Drop structure.