JP3024677B2 - Waterproof structure of housing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a housing, and more particularly to a waterproof structure for a housing which is used in an outdoor environment and uses a spur.

[0002] In this document, one housing and the other housing fitted to the housing may be collectively referred to as a housing.

[0003]

2. Description of the Related Art Conventionally, portable equipment and outdoor equipment have a structure in which, for example, a casing is fitted through a packing to maintain waterproofness. FIG. 2 is a diagram showing an example of a conventional waterproof structure of a housing using packing. In the structure in which the housing 21 and the housing 22 are fitted, the housing 21
By inserting the packing 24 into the groove 23 provided in the seal portion and fitting the housing 22, the waterproof structure is maintained. The packing 24 includes a packing body 24A and a fin 24B.
When the fin 24B is inserted into the groove 23
Of the packing body 24A and the groove 2 on the packing body 24A.
Pressure is applied from the wall of No. 3 and it is hard to come off.

However, the packing 24 may come off when the housing 22 is opened and closed. If the packing 24 is left off or is incorrectly inserted, waterproofness cannot be maintained. Although the above-described waterproof structure is devised to press-fit the packing 24 into the groove 23, it cannot be said that the packing 24 does not necessarily come off.

[0005] As a waterproof structure of a housing that solves this problem, a waterproof structure using a spur method in which a groove is provided in a seal portion of the housing and silicon or the like is applied to the groove has been proposed. FIG. 3 is a diagram illustrating an example of a waterproof structure of a housing using the spur method. In the structure in which the housing 31 and the housing 32 are fitted to each other, silicon is directly applied to the groove 33 provided in the seal portion of the housing 31 to form the spur portion 34, and the housing 31 is fitted with the housing 32. The structure maintains the waterproofness. Since silicon is applied directly to the housing 31, it is difficult for the silicon to be peeled off due to adhesion.

FIG. 4 shows a waterproof structure of a semiconductor device described in Japanese Patent Application Laid-Open No. 4-17359. The radiator 45 is
It has a cooling water channel, and dissipates heat of the semiconductor in the cover 43 by conduction through the metal base plate 44. Also cover 4
A frame-shaped sealing member 41 is provided around the periphery 3, and the protrusion 42 presses the cover 43 by elasticity, thereby preventing the water droplets 4 </ b> A adhering to the radiator 45 from entering the inside of the cover 43. In addition,
The cover 43 and the metal base plate 44 are joined by an adhesive 46. However, this waterproof structure is less likely to be used for portable equipment and outdoor equipment due to durability and appearance problems.

[0007]

In the conventional spur method shown in FIG. 3, when the housing is fitted, a gap is generated in the seal due to the repulsive force of the silicon. In particular, when the spur method is used for a plastic casing, the casing may be distorted. The reason is that when fitting the housing, there is no place where the volume of the crushed silicon escapes.

[0008] If silicon having low hardness (or a material having compressibility) is used to improve the above-mentioned disadvantage, the resilience can be eliminated because of the compressibility, but the waterproofness is higher than that of silicon having high hardness. Gets worse. The reason for this is that silicon having a low hardness has lower elasticity than silicone having a high hardness, and thus has poor waterproofness.

An object of the present invention is to provide a place for releasing the volume of the spur that has been crushed when the housing is fitted, thereby avoiding the generation of a gap in the seal portion of the housing and the distortion of the housing.

[0010]

The present invention employs the following means to solve the above-mentioned problems.

(1) A seal portion provided in a groove of one of a pair of housings to be fitted is formed by directly applying a material having low hardness and compressibility, A waterproof structure of a housing formed from a material having high hardness and elasticity applied directly on top, and the other housing crushing the seal portion to maintain waterproofness.

(2) The waterproof structure for a housing according to the above (1), wherein both the materials are silicon.

(3) The waterproof structure for a housing according to (1), wherein the projections of the other housing crush the seal portion.

[0014]

According to the waterproof structure of the present invention, the case is fitted by tightening the screw with screws, and the elastically deformable spur portion of the seal portion of the case is pressed to maintain the waterproofness. This spur part is formed by directly applying a material such as silicon having low hardness and compressibility, and directly applying a material such as silicon having high hardness and elasticity on the spur part. When pressure is applied, silicon or the like having a low hardness is compressed, so that the volume of the crushed spur can be released, thereby avoiding generation of a gap between the casings and distortion of the casing.

High hardness silicon or the like formed on the surface of the spur has high elasticity and can maintain waterproofness.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a waterproof structure of a housing of the present invention. (A) is an exploded perspective view of the housing, (b) is a cross-sectional view taken along line AA in (a),
(C) is a cross-sectional view of the spur portion before the housing is fitted, (d)
FIG. 4 is a cross-sectional view of the spur portion after the housing is fitted.

Referring to FIG. 1, a sample housing intended for outdoor use comprises a housing 1 and a housing 2, and the housing 1 and the housing 2 are sealed by tightening a screw 6. Have. The seal portion of the housing 1 is provided with a groove 3 over the entire circumference. Silicon is applied to the groove 3 to form an elastically deformable spur portion 4 which is in close contact with the groove 3. The spur portion 4 is formed by applying low-hardness silicon 7 on the bottom surface of the groove portion 3 and high-hardness silicon 8 thereon, and is formed from two kinds of materials having different hardnesses. Further, a projection 5 is provided over the entire periphery of the seal portion of the housing 2.

In the thus configured housing, when the housing 1 and the housing 2 are fitted and the screw 6 is tightened, the protruding portion 5 crushes the spur portion 4 to maintain waterproofness.
At this time, the low-hardness silicon 7 has compressibility, and releases the crushed silicon volume. Therefore, no gap is generated between the housing 1 and the housing 2, and distortion of the housing can be avoided.

Further, the silicon 8 having high hardness can be waterproofed by strong elasticity.

[0020]

As is apparent from the above description, according to the present invention, when fitting a casing having a waterproof structure using the spur method, it is possible to avoid the occurrence of gaps in the seal portion and distortion of the casing. can do.

The reason is that the spur portion is formed by directly applying a material such as silicon having a low hardness and compressibility and a material such as a silicon having a high hardness and elasticity thereon. This is because, when pressure is applied to the spur portion, silicon having a low hardness is compressed, and the volume of the crushed spur can be released.

According to the present invention, the spur portion is
It has compressibility and has waterproof elasticity.

The reason is that the spur portion is formed by directly applying a material such as silicon having low hardness and compressibility and a material such as silicon having high hardness and elasticity to the spur portion. Silicon and the like having high hardness have high elasticity, and when crushed, repulsive force is generated.

[Brief description of the drawings]

FIG. 1 shows various views of a waterproof structure of a housing according to an embodiment of the present invention, (a) is an exploded perspective view of the housing, and (b) is (a).
3C is a cross-sectional view taken along line AA, (c) is a cross-sectional view of the spur portion before the housing is fitted, and (d) is a cross-sectional view of the spur portion after the housing is fitted.

FIGS. 2A and 2B show various views of a waterproof structure of a housing using a conventional packing; FIG. 2A is an exploded perspective view of the housing; FIG. 2B is a cross-sectional view of a packing portion before the housing is fitted; c) is a sectional view of the packing.

FIGS. 3A and 3B show various views of a waterproof structure of a housing using a conventional spur method, wherein FIG. 3A is an exploded perspective view of the housing and FIG. 3B is a cross-sectional view taken along line BB in FIG. .

FIG. 4 shows various views of a conventional waterproof structure of a semiconductor device;
(A) is a plan view, (b) is a cross-sectional view, and (c) is an enlarged cross-sectional view showing a state in which water droplets are generated on the surface of a heat radiator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing (one housing) 2 Housing (the other housing) 3 Groove part 4 Spur part 5 Projection part 6 Screw 7 Silicon with low hardness 8 Silicon with high hardness

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 53/00 H05K 5/06

Claims (3)

(57) [Claims] A sealing member provided in a groove of one of a pair of housings to be fitted, wherein the sealing member is formed of a low-hardness and compressible material directly applied; A waterproof structure for a casing, characterized in that the casing is formed from a material having high hardness and elasticity that is applied directly to the seal, and the other casing crushes the seal portion to maintain waterproofness. 2. The waterproof structure for a housing according to claim 1, wherein both the materials are silicon. 3. The waterproof structure for a housing according to claim 1, wherein a projection of the other housing crushes the seal portion.