JPH1146070A - Case body for small-sized electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a case body, which can prevent noises, such as static electricity, from infiltrating into the interior of the case body without needing a special component, for a small-sized electronic equipment. SOLUTION: In a case body 13, which is housed with an electronic circuit in the interior thereof by coalescing a plurality of sites into one, for a small- sized electronic equipment, joints 17, 19 and 20 of the adjacent sites are superposed, whereby the length of the infiltration path of noise, such as static electricity is lengthened, noise, such as static electricity, is prevented from infiltrating in the interior of the case body without the need for a special component, the number of parts items of the electronic equipment is reduced, and the production efficiency of the electronic equipment is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for a small electronic device, such as a pager, for preventing noise from entering the housing or the like.

[0002]

2. Description of the Related Art The housing of a small electronic device such as a pager mainly comprises a front case and a rear case, and electronic components and electronic circuits are housed inside by combining the front case and the rear case. Since the electronic components and electronic circuits operate with a weak current, they are easily affected by external noise such as static electricity. Therefore, it is desirable that the housing is such that noise such as static electricity does not easily enter the housing.

Referring to FIGS. 9 and 10, a housing of a conventional small electronic device will be described.

A housing 3 having a display unit 1 and operation buttons 2 on its surface is mainly composed of a front case 4 and a rear case 5. The front case 4 and the rear case 5 are united by bolts (not shown) or necessary engagement means such as fitting. The side wall 6 of the front case 4 and the side wall of the rear case 5 are combined. A slight gap 8 is formed at the abutting portion with the portion 7. A wiring board 10 on which electronic components 9 are mounted and an electronic circuit (not shown) is formed is housed in the housing 3.

[0005]

For example, when static electricity enters the inside of the housing 3 through the gap 8, the distance of the entrance path of the static electricity generated by the gap between the housings, that is, the distance from the outside to the inside of the housing 3, is set to l. As shown in FIG. 10, when the thickness of the side wall 6 of the front case 4 is a, the distance 1 is substantially equal to the thickness a of the side wall 6. In the housing of the small electronic device, the value of the plate thickness a of the side wall portion 6 is small, and the distance is such that the external static electricity can enter, and the electronic components 9 and the electronic circuit on the wiring board 10 close to the gap 8 are static electricity. Easily affected by

For this reason, if the standard of the electrostatic withstand voltage is not satisfied, a plate for an electrostatic shield,
Parts such as seats and caps are separately required, which increases the number of parts, increases production costs, and lowers production efficiency.

In view of such circumstances, the present invention prevents noise such as static electricity from penetrating into the inside of a housing without requiring any additional components, thereby reducing the number of components and improving production efficiency.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a compact electronic device housing in which an electronic circuit is housed by combining a plurality of portions to form a small-sized electronic device in which joints between adjacent portions are superimposed. The present invention relates to a housing of an electronic device, wherein the adjacent parts are a front case and a rear case, and a vertical wall formed on one of the side walls of the front case and the rear case, a front case, and a rear case. Or the other side wall is overlapped with the case of a small electronic device, and a vertical wall is formed on one side wall of the front case or the rear case, and the other side of the front case or the rear case is formed on the other side. A double-sided wall is formed, the vertical wall is fitted between the side walls, and the present invention relates to a housing of a small electronic device in which a joint between the front case and the rear case is overlapped.
In addition, the vertical wall is formed to be double, the side wall is formed to be triple, and the vertical wall is fitted between the side walls, and the height of the side wall located inside the side wall is increased. Wherein the adjacent portions are a front case, a rear case, and a battery cover, and a vertical wall having an outer hook portion at a tip at one end of the battery cover, a front case,
An inner hook portion is formed on one of the side walls of the rear case, and a sliding groove is formed on the other end of the battery lid.
A tongue is extended to the other end face of the bottom plate of the front case or the rear case, the outer hook and the inner hook are slidably engaged with each other, and the tongue is slidable in a sliding groove. The present invention relates to a housing of a fitted small electronic device, and furthermore, the adjacent portions are a front case and a button, a flange portion is formed on the button, and the flange portion and the front case are perforated. The present invention relates to a housing of a small electronic device in which a button press formed on the periphery of a hole is overlapped.

[0009] Since the joining portion of the adjacent portion is superposed, the distance of the entry path of noise such as static electricity becomes long. Therefore, it is possible to prevent the penetration of noise such as static electricity without any additional parts, and to reduce the number of parts. Improve production efficiency.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, a display unit 1 is provided on the surface.
A housing 13 having 1 and operation buttons 12 mainly includes a front case 14 and a rear case 15.

At the lower end of the side wall 16 of the front case 14, a thin vertical wall 17 is formed. On the side wall of the rear case 15, the outer wall 19 and the outer wall 19 face each other at a required interval, and an inner wall 20 higher than the outer wall 19 is formed. A blocking groove 18 is formed between them.

The vertical wall 17 of the front case 14 is fitted into the blocking groove 18 of the rear case 15 and the front case 14 and the rear case are connected to each other by bolts (not shown) or necessary engaging means such as fitting. The case 15 is combined. A slight gap 21 is formed between the vertical wall 17 of the front case 14 and the outer wall 19 of the rear case 15.

The housing 13 has an electronic component 22 therein.
Is mounted and a wiring board 23 on which an electronic circuit (not shown) is formed is housed.

For example, when static electricity enters the inside of the casing 13 from the gap 21, the distance of the entrance path of the static electricity generated by the casing gap, that is, the distance from the outside to the inside of the casing 13, is 1 as shown in FIG. Assuming that the thickness of the side wall 16 of the front case 14 is a, the depth of the blocking groove 18 is b, and the height of the inner wall 20 is c, l = a + b + c (> a). The distance l of the entrance path of the static electricity becomes larger than the thickness a, the electrostatic breakdown voltage increases, and the static electricity hardly flies. Thus, the influence of static electricity on the electronic components 22 and the electronic circuits on the wiring board 23 close to the gap 21 is reduced.

In this embodiment, the vertical wall is formed on the side wall of the front case and the side wall of the rear case is doubled. However, the vertical wall is formed on the side wall of the rear case, and the vertical wall is formed on the side wall of the front case. It may be heavy.

Referring to FIG. 4, a second embodiment of the present invention will be described. FIG. 4 shows a simpler structure of the one shown in FIGS. FIG.
The same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals.

The housing 13 mainly comprises a front case 14 and a rear case 15. The front case 1
A thin vertical wall 17 is formed at the lower end of the side wall 16 of the fourth. The lower part of the hanging wall 17 is the side wall 1 of the rear case 15.
9 and polymerized in the thickness direction. The front case 14 and the rear case 15 are united by a required engaging means such as a bolt (not shown) or fitting. A slight gap 21 is formed between the vertical wall 17 of the front case 14 and the side wall 19 of the rear case 15.

For example, static electricity is applied to the housing 1 through the gap 21.
3, the distance of the entrance path of static electricity generated by the gap between the casings, that is, the distance from the outside to the inside of the casing 13 is l, the thickness of the side wall 16 of the front case 14 is a,
Assuming that the height of the side wall 19 of the rear case 15 is b, l
= A + b (> a), the distance l of the entrance path of the static electricity becomes larger than the thickness a of the side wall 16, the electrostatic breakdown voltage increases, the static electricity hardly flies, and the static electricity enters the housing 13. The effect of static electricity is reduced.

In the present embodiment, the vertical wall is formed in the front case and is fitted inside the side wall of the rear case. However, the vertical wall may be formed in the rear case and fitted inside the side wall of the front case. .

Referring to FIG. 5, a third embodiment of the present invention will be described. The one shown in FIG. 5 further suppresses the influence of noise such as static electricity than the one shown in FIGS. In FIG. 5, the same components as those shown in FIGS. 1 to 3 are denoted by the same reference numerals.

The housing 13 mainly comprises a front case 14 and a rear case 15. The front case 1
At the lower end of the side wall 16 of the fourth member, a thin outer hanging wall 17a and an inner hanging wall 17b opposed to the outer hanging wall 17a at a required interval are formed, and between the outer hanging wall 17a and the inner hanging wall 17b. Is formed with an upper blocking groove 24.

An outer wall 1 is provided on the side wall of the rear case 15.
9, an intermediate side wall 25, and an inner side wall 20 are formed, and these three side walls are gradually increased toward the inside, and an outer blocking groove 18a is formed between the outer side wall 19 and the intermediate side wall 25, An inner blocking groove 18b is formed between the intermediate side wall 25 and the inner side wall 20.

The vertical wall 17a of the front case 14
The hanging wall 17b is connected to the outer blocking groove 18a of the rear case 15,
The front case 14 and the rear case 15 are fitted together with the inner blocking grooves 18b by bolts (not shown) or necessary engagement means such as fitting. Between the outer wall 17 a of the front case 14 and the outer wall 19 of the rear case 15, a gap 21 having a 99-fold shape is slightly formed.

For example, static electricity is applied to the housing 1 through the gap 21.
3, the distance of the entrance path of static electricity generated by the gap between the casings, that is, the distance from the outside to the inside of the casing 13 is l, the thickness of the side wall 16 of the front case 14 is a,
Assuming that the depth of the outer blocking groove 18a is b, the depth of the upper blocking groove 24 is c, and the height from the tip of the inner wall 20 to the inner blocking groove 18b is d, l = a + b + 2c + d (> a). As compared with the thickness a of the side wall 16, the distance l of the entrance path of the static electricity is increased, the electrostatic withstand voltage is increased, the static electricity is less likely to fly, and the influence of the static electricity on the inside of the housing 13 is significantly reduced. You.

In this embodiment, the vertical wall is formed double in the front case and the side wall is formed triple in the rear case. However, the vertical wall is formed double in the rear case and the side wall is formed in the front case. May be formed three times.

Referring to FIGS. 6 and 7, a fourth embodiment of the present invention will be described.

The housing 30 mainly comprises a front case 31 and a rear case 32. A battery cover 33 for accommodating a battery is attached as a part of the housing 30 from the side to the back of the housing 30.

The front case 31 and the rear case 32
Are assembled by bolts (not shown) or required engagement means such as fitting, and electronic components 34 and 35 are mounted inside the housing 30 to form an electronic circuit (not shown). The printed wiring board 36 is stored.

The battery cover 33 has a substantially L-shaped cross section, and is mounted as a part of the housing 30 between a side wall 37 of the front case 31 and a bottom plate 38 of the rear case 32. The front case 3 of the battery lid 33
A thin vertical wall 39 is formed along the edge on the side joined to the first side wall 37, and an inner hook portion 40 is formed at the tip of the vertical wall 39 over the entire length.

An outer hook 41 is formed on the side wall 37 of the front case 31 over the entire length of the side wall 37 so as to correspond to the inner hook 40 of the battery lid 33.
Is slidably engaged with the inner hook portion 40. Battery cover 3
3 has a sliding groove 4 on the end face of the rear case 32 on the bottom plate 38 side.
2 is formed, and the bottom plate 3 is formed so as to correspond to the sliding groove 42.
A tongue piece 43 extends from the end face of the reference numeral 8.

The inner hook portion 40 and the outer hook portion 41 are engaged with each other, and the tongue piece 43 is fitted into the slide groove 42, and the battery cover 33 is moved in a direction perpendicular to the plane of FIG. And attached to the housing 30. The battery lid 33, the side wall 37 of the front case 31, the rear case 3
Between the two bottom plates 38, gaps 44 and 45 are slightly formed, respectively.

The entry route of the static electricity is bent because the inner hook portion 40 and the tongue piece 43 are provided, so that the distance of the entry route becomes long. The effect of static electricity on the nearby electronic components 34 and 35 is reduced.

In this embodiment, an outer hook is formed on the side wall of the front case, and a tongue is extended on the end surface of the bottom plate of the rear case. Was formed, but a tongue piece was extended to the bottom plate end face of the front case,
An outer hook portion may be formed on the side wall of the rear case, and a sliding groove and an inner hook portion may be formed on the battery lid to correspond to the outer hook portion.

Referring to FIG. 8, a fifth embodiment of the present invention will be described.

A button 51 is mounted on the front case 50, and a push switch 53 is mounted inside the housing 52 so as to correspond to the button 51, and a wiring board 54 on which an electronic circuit (not shown) is formed is housed. Have been. The button 51 includes a head 55 and a flange portion 56 formed around the head 55.
And a leg portion 57 extending from the center of the flange portion 56. The front case 50 is provided with a hole 59 in which a button holder 58 is formed in an eave shape around the periphery so as to correspond to the shape of the button 51. The button 51 is fitted from the inside of the hole 59. A slight gap 60 is formed between the button 51 and the button holder 58.

For example, static electricity is generated from the gap 60 through the housing 5.
2, the distance of the entrance path of static electricity generated by the gap between the housings, that is, the distance from the outside to the inside of the housing 52 is 1, the thickness of the front case 50 is a, and the width of the flange portion 56 is b. Then, 1 = a + b (> a), and the static electricity is applied to the push switch 53 close to the gap 60.
The push switch 53 and the electronic circuit are less susceptible to the effect of static electricity because the distance to the electronic circuit is longer.

[0038]

As described above, according to the present invention, it is possible to prevent noise such as static electricity from entering the inside of the housing and to reduce the number of components without requiring any additional components.
Production efficiency is improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is a sectional view of a main part according to the first embodiment of the present invention.

FIG. 4 is a view corresponding to an arrow AA according to a second embodiment of the present invention.

FIG. 5 is a view corresponding to an arrow AA according to a third embodiment of the present invention.

FIG. 6 is a bottom view according to a fourth embodiment of the present invention.

FIG. 7 is a view taken in the direction of arrows BB in FIG. 6;

FIG. 8 is a sectional view of a main part according to a fifth embodiment of the present invention.

FIG. 9 is a plan view according to a conventional example.

FIG. 10 is a view taken in the direction of the arrows CC in FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Case 14 Front case 15 Rear case 17 Vertical wall 19 Outer side wall 20 Inner wall 30 Housing 31 Front case 32 Rear case 33 Battery cover 39 Vertical wall 40 Inner hook 41 Outer hook 42 Sliding groove 43 Tongue 50 Front Case 51 Button 52 Housing 56 Flange 58 Button Holder

Claims (6)

[Claims] 1. A small electronic device according to claim 1, wherein a plurality of portions are united to form a joint between adjacent portions in a housing of the small electronic device in which an electronic circuit is housed. Housing. 2. An adjacent part is a front case and a rear case, and a vertical wall formed on one of the side walls of the front case and the rear case is overlapped with one of the other side walls of the front case and the rear case. The housing of the small electronic device according to claim 1. 3. A vertical wall is formed on one of the side walls of the front case and the rear case, and a double wall is formed on the other of the front case and the rear case, and the vertical wall is interposed between the side walls. 2. The housing for a small electronic device according to claim 1, wherein the housing is fitted and the joint between the front case and the rear case is overlapped. 4. The vertical wall is formed double, and the side wall is formed triple, and the vertical wall is fitted between the side walls and the height of the side wall located inside the side wall is increased. The housing of the small electronic device according to claim 3. 5. The adjacent part is a front case, a rear case, and a battery cover, and a vertical wall having an outer hook portion at one end is formed at one end of the battery cover, and one of the front case and the rear case is provided. An inner hook is formed on the side wall, a sliding groove is formed on the other end of the battery lid, and a tongue piece is extended on the other end face of the bottom plate of either the front case or the rear case so as to correspond to the sliding groove. The housing of the small electronic device according to claim 1, wherein the outer hook portion and the inner hook portion are slidably engaged with each other, and the tongue piece is slidably fitted in the sliding groove. 6. The adjacent part is a front case and a button, a flange part is formed on the button, and the flange part,
2. The housing for a small electronic device according to claim 1, wherein a button press formed on a periphery of a hole formed in the front case is overlapped.