JP2003174269A - Electronic component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component of a type that the opening of a resin box type casing receiving elements in a circular recess is covered by a cover made of an elastic material and the cover is hardly released from the casing, even when the cover receives some external force while the side surface of the casing can be a type of a plane. <P>SOLUTION: The opening of a box type casing 11 of a plastic, which receives the element in a circular recess 11A and which is provided with recesses 16, 17 in both corners of opposing side surfaces 11B, 11C, is covered by the cover 12, made of an elastic material and having protrusions 14A, 15A, engaged with the recesses 16, 17 and projected inward while having a biasing force in the levitating direction from the upper surface of the casing 11. A release preventing means for making the releasing of the cover difficult in cooperating with the biasing force of the cover 12 is provided whereby the electronic component, whose cover 12 is hardly released even when the same receives some external force and the side surfaces of the casing can be provided with the shape of a flat plane, can be realized. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component of a type in which an opening of a resin box-shaped case containing an element in a circular recess whose upper surface is an opening is covered with a cover made of an elastic material. Is.

[0002]

2. Description of the Related Art A conventional electronic component of this type is shown in FIG.
This will be described with reference to FIGS.

FIG. 11 is an external perspective view of a push switch as an electronic component of a type in which an opening of a resin box-shaped case accommodating a conventional element is covered with a cover made of an elastic material.
FIG. 2 is a front view of the same, and FIG. 13 is a side view of the same. In FIG. 13, 1 is a resin box-shaped case, 2 is a cover made of an elastic thin metal plate, and 3 is a push button for operating a switch.

As shown in the front sectional view of FIG. 14, a switch element is housed in a circular recess 1A having an opening on the planar upper surface of the case 1.

That is, the center contact 4A and the peripheral contact 4B as the fixed contact 4 are insert-molded and fixed on the bottom surface of the circular recess 1A of the case 1, and a plurality of connection terminals 5 electrically connected to each are provided on the outer periphery. A circular dome-shaped movable contact 6 made of an elastic metal thin plate is placed on the peripheral contact 4B, and the central lower surface thereof faces the central contact 4A with a predetermined space, and the push button 3 is provided on the upper surface. The upper end portion 3A of the cover 2 is placed and protrudes upward from the central circular hole 2B of the flat cover plate portion 2A of the cover 2 that covers the opening of the circular recess 1A.

In this push switch, by pressing the upper end portion 3A of the push button 3, the circular dome-shaped movable contact 6 of the switch element becomes the peripheral contact 4B of the fixed contact 4.
And the central contact 4A are contacted and separated, and the signal is the connection terminal 5
Through the circuit of the equipment used.

The cover 2 is a window-shaped hole 7A formed by punching into each of the sandwiching portions 7 and 8 that sandwich the case 1 by bending the cover 2 from two opposing ends of the cover plate portion 2A. , 8A are provided on the opposing flat side surfaces of the case 1 so as to have a slope increasing from the upper surface side to the lower surface side of the case 1 for locking 9,1
0, that is, by engaging the frame portions 7B and 8B below the holes 7A and 8A with the lower end surfaces 9A and 10A of the projections 9 and 10 perpendicular to the side surface of the case 1, It is fixed.

Further, in the method of fixing the cover 2 by assembling it to the case 1, as shown in the exploded front view of the partial cross section of FIG. 15, the sandwiching portions 7 and 8 of the cover 2 face the opposite side surfaces of the case 1. In order to pinch, the slightly opened front ends of the frame portions 7B, 8B at the lower ends of the pinching portions 7, 8 are used as guides to combine the switch element and the push button 3 from above the case 1 and the pinching portions 7, 8 are combined. The side projections 9 and 10 are fitted into the holes 7A and 8A, and the frame portions 7B and 8B of the holes 7A and 8A are projected into the projections 9 and 10 as shown in FIGS.
The lower end surfaces 9A and 10A are hooked and locked.

[0009]

However, in the conventional push switch as an electronic component of the type in which the opening of the resin box-shaped case accommodating the element is covered with the cover made of the elastic material, the cover 2 is clamped. Holes 7 in parts 7 and 8
In order to securely hook the frame portions 7B and 8B of A and 8A on the lower end surfaces 9A and 10A of the locking projections 9 and 10 on the side surface of the case 1, the frame portions 7B and 8B of the holes 7A and 8A and the protrusions. 9, 1
It is necessary to provide a gap between the lower end surface 9A and the lower end surface 9A of the cover 0. Therefore, if the cover 2 rattles the case 1 or the push switch is impacted by being dropped or the like, the cover 2 The gap between the sandwiching portions 7 and 8 may be momentarily opened and the cover 2 may come off the case 1. Further, since the tip portions of the projections 9 and 10 project from the opposite side surfaces of the outer periphery of the case 1, There is a problem that it is disadvantageous in handling during mounting.

The present invention solves such a conventional problem. The cover is less likely to rattle against the case, and the cover does not easily come off from the case even if an external force such as some impact is applied. An object of the present invention is to provide an electronic component of a type in which the opposite side surfaces of the outer periphery of the case can be made flat and the opening of a resin box-shaped case accommodating an element is covered with a cover made of an elastic material.

[0011]

In order to achieve the above object, the present invention has the following constitution.

According to a first aspect of the present invention, the outer shape is rectangular in a top view, the element is housed in a recess having an opening in the upper surface, and the element is predetermined upward from the lower ends of both corners of the opposite side surfaces. A resin box-shaped case with a recess in height and the upper surface of this case, the central part abuts on the upper surface of the case, and each end of both side parts sandwiching the central part has a predetermined size from the upper surface of the case. The cover plate part that is biased so that it floats up, and the inward projections that extend along the opposite side faces of the case from the ends of the two side parts that float up and that engage with the recesses on both sides of the tip. The cover made of an elastic material, which is composed of a sandwiching portion having a portion, and the biasing force of the cover plate portion of the cover on both side end portions upward, cooperates with the depression of the side surface of the case and the protrusion of the sandwiching portion of the cover. Disengagement prevention means that makes it difficult to disengage from the engagement part And a recess provided at a corner of a rectangular case having a recess and an inward protrusion provided at a holding portion of the cover engage with each other with a large hanging allowance. At the same time, due to the disengagement prevention device that cooperates with the biasing force due to the elasticity of the cover, the cover is less likely to rattle against the case, and the cover does not easily come off from the case even if it receives an external force such as a slight impact, and the outer circumference of the case It is possible to realize an electronic component of a type in which opposite side surfaces of the device can be made flat and the opening of the resin box-shaped case accommodating the element is covered with a cover made of an elastic material.

According to a second aspect of the present invention, in the first aspect of the invention, in particular, the means for preventing disengagement between the recess on the side surface of the case and the protrusion of the holding portion of the cover is the side surface of the case on the upper end surface of the recess. Is inclined so that the angle opposed to is less than 90 °, and the upper surface of the protruding portion of the sandwiching portion is inclined such that the tip portion is higher than the root portion. Without increasing man-hours etc., the protruding part of the sandwiching part of the cover stably engages with the recess on the side surface of the case, that is, the cover rarely rattles against the case and receives some external force. In addition, it is possible to obtain an effect that the cover can be realized as an electronic component that is hard to be removed from the case.

According to a third aspect of the present invention, in the first aspect of the invention, in particular, the means for preventing disengagement between the recess on the side surface of the case and the projection of the holding portion of the cover has a recess on the upper end surface of the recess. The protrusions of the cover are provided on the upper surface of the protrusion of the sandwiching part, and the protrusions of the sandwiching part of the cover can be installed in the case without increasing the number and price of the components and the number of assembly steps. It is possible to obtain an effect that an electronic component that is reliably engaged and held in the depression on the side surface of the can be realized.

According to a fourth aspect of the present invention, in the invention according to the second or third aspect, particularly, the upper surface of the case is made flat, and the central portion of the cover plate portion of the cover is brought into contact with the upper surface of the case, Each end of both side parts is bent in the direction away from the upper surface of the case, which is generally the most expensive of the constituent materials.The molding die for resin molding the case is simple and inexpensive. Therefore, it is possible to obtain the effect that the electronic component as a whole can be made inexpensive.

According to a fifth aspect of the invention, in the invention according to the second or third aspect, particularly, the upper surface of the case is inclined so that the central portion is high and the portions near the opposing side surfaces are low, and the cover is provided. The cover plate part of is a flat plate, and the configuration of the molding die for forming the case with resin becomes somewhat complicated, but since the top surface of the cover of the electronic component is a flat plate,
It is possible to obtain an effect that it is advantageous for automatic mounting and the like.

According to a sixth aspect of the invention, in the invention according to the fifth aspect, particularly, the outer shape of the case and the shape of the cover plate portion of the cover viewed from the upper surface side are rectangular, and both side portions of the cover plate portion are formed. After pressing downward to engage the depression on the side surface of the case with the protrusion of the holding portion of the cover, the sub-flat plate portion that can be bent in the direction along the side surface of the case is opposed to the holding portion of the cover plate portion. It is provided at the ends of the other two sides different from the two sides, and in the completed electronic component, the cover plate portion is hard to deform even if the cover plate portion of the cover is pressed, and therefore, the recess on the side surface of the case It is possible to obtain the effect that the engagement of the holding portion of the cover with the protruding portion can be made more difficult to disengage.

According to a seventh aspect of the invention, in the sixth aspect of the invention, in particular, the half-cut portion is provided along the bending line of the sub-flat plate portion, and the width dimension of the sub-flat plate portion along the folding line is set. The size of both sides of the cover plate part of the cover is equal to or more than the size that floats from the top surface of the case, the bending process of the sub flat plate part is easy, the bending position is accurate, and it is bent. With the sub-flat plate portion, it is possible to obtain an effect that the gap between the both side portions of the cover plate portion of the cover and the upper surface of the case can be closed.

According to an eighth aspect of the present invention, in the first aspect of the present invention, in particular, a taper portion is provided at an upper end corner portion of a side surface of the case which opposes to reduce a gap between the upper ends, and each of the holding portions of the cover. The protrusion has a taper shape in which the tip of the lower surface is higher than the root, and when the cover and the case are combined and engaged, the lower surface of the protrusion of the holding portion of the cover and the upper end of the side surface facing the case The effect of being able to smoothly mesh with each other and easily combining them is obtained.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

The same components as those described in the section of the prior art are designated by the same reference numerals and detailed description thereof will be omitted.

(First Embodiment) Using the first embodiment,
The invention described in claims 1 to 4 and 8 of the present invention will be described.

FIG. 1 is a front view of a push switch as an electronic component of a type in which an opening of a resin box-shaped case accommodating an element according to a first embodiment of the present invention is covered with a cover made of an elastic material. 2 is the same side view, and FIG. 3 is the same exploded perspective view.

As shown in the figure, the push switch according to the present embodiment has a circular recess 11A having an opening at the central position of a planar upper surface of a resin box-shaped case 11 whose outer shape is rectangular when viewed from above. A switch element is accommodated therein, that is, a fixed contact 4 (not shown) that is electrically connected to the connection terminal 5 is insert-molded and fixed to the bottom surface of the circular recess 11A, and a circular dome-shaped movable contact 6 (not shown) is provided above the fixed contact 4. No.), and the upper end portion 3A of the push button 3 placed on the upper surface of the circular dome-shaped movable contact 6 has a central circular hole 12A.
Cover 1 made of an elastic thin metal plate so as to project upward from the
The fact that the second cover plate portion 13 covers the opening of the recess 11A of the case 11 and its operation are the same as in the case of the conventional technique.

However, the flat plate-shaped holding portions 14 and 15 are formed by bending from two opposite ends of the cover plate portion 13 of the cover 12 and extended along the opposite side surfaces 11B and 11C of the case 11, respectively. Protrusions 14A, 15A provided inwardly on both sides of the lower end of each of the recesses 16 provided at a predetermined height from the lower ends of both corners, which are thick-walled parts of the side faces 11B, 11C of the case 11 facing each other. , 17 are engaged with each other, so that the cover 12 is fixed to the case 11.

As shown in FIG. 1, in this engaging portion, the upper end surfaces 16A and 17A of the recesses 16 and 17 at both corners of the opposite side surfaces 11B and 11C of the case 11 form an angle of 90 ° with respect to each side surface. And the inside is higher than the outside and inclined, and the holding portions 14 and 1 of the cover 12 are
The upper surfaces of the projecting portions 14A and 15A provided on No. 5 are also inclined so that the tip end portion is higher than the root portion.

Further, the central portion 13A of the cover plate portion 13 of the cover 12 is in contact with the flat upper surface of the case 11 having the opening portion, and the case 11 is opposed to both sides of the central portion 13A with the central portion 13A interposed therebetween. The side portions 13B and 13C close to the side surfaces 11B and 11C are warped in a direction in which the end portions where the sandwiching portions 14 and 15 are provided are lifted from the flat upper surface of the case 11 by a predetermined dimension, and the biasing force due to this warp is applied. By the sandwiching portions 14 and 15, that is, the protruding portions 14A and 15A
Is pulled upward, and its upper surface is the upper end surface 1 of the depressions 16 and 17.
6A and 17A are urged so as to be engaged stably with no gap.

Here, a method of assembling and fixing the cover 12 to the case 11 will be described with reference to the front views for explaining the combination method of FIGS. 4 (a) and 4 (b).

First, as shown in FIG. 3A, the cover 1
Protrusions 14 on both sides of the lower end of the sandwiching portions 14 and 15 facing each other
A, 15A taper parts 14B, 15B on the lower surface and the case 1
The cover 12 is assembled from above the case 11 accommodating the switch element and the push button 3 by engaging the taper portions 18A and 18B provided at the upper end corners of the opposite side surfaces 11B and 11C of FIG. As shown in FIG. 5, the central portion 13A sandwiched between the side portions 13B and 13C that are curved upwards of the cover plate portion 13 of the cover 12 is pressed against the flat upper surface of the case 11 as indicated by the thin arrow in the figure. In addition, the protrusions 14 on both sides of the lower ends of the holding portions 14 and 15
A and 15A have side ends 11B facing the case 11,
The pinching portions 14 and 15 are elastically deformed by being pushed and spread by hitting 11C.

Next, in this state, the sandwiching portions 14, 1 of the side portions 13B, 13C of the cover plate portion 13 of the cover 12 are provided.
The end portion where 5 is bent is strongly pressed from above as shown by the two thick arrows in FIG.
By pressing B and 13C onto the upper surface of the case 11, the protrusions 14A and 15 on both sides of the lower ends of the sandwiching portions 14 and 15 are pressed.
The upper surface of A is pushed down to a position lower than the upper end surfaces 16A, 17A of the depressions 16, 17 of the opposite side surfaces 11B, 11C of the case 11, and the sandwiched portions 14, 15 expanded.
By the elastic restoring force of the protrusions 14A, 15A
The lower end surfaces 16A and 17A of the Nos. 6 and 17 are made to enter and hooked.

After that, when the pushing force applied to the end of the cover plate portion 13 of the cover 12 is removed, the side portion 13 of the cover plate portion 13 is removed.
As B and 13C are warped upward by the elastic restoring force, as shown in FIG.
The inclined upper surfaces of 4A and 15A are stably held by the inclined surfaces of the upper end surfaces 16A and 17A of the recesses 16 and 17 on the side surface of the case 11.

Here, the opposite side surfaces 11 of the case 11
The configuration of the engaging portion between the upper end surfaces of the recesses 16 and 17 of B and 11C and the upper surfaces of the protruding portions 14A and 15A at the lower ends of the sandwiching portions 14 and 15 of the cover 12 is shown in FIG. As shown in a partially enlarged front view of another configuration, a recess 19A is provided on the upper end surface of the recess 19 on the side surface of the case, and a projection 20A is provided on the upper surface of the projecting portion 20 of the holding portion of the cover, and both are engaged. With such a configuration, the protruding portion 20 of the holding portion of the cover is more reliably and stably engaged and held in the recess 19 on the side surface of the case.

The cover 12 does not necessarily have to be formed of an elastic metal thin plate, but may be formed of an elastic resin material or the like, and the upper corners of the opposite side surfaces 11B, 11C of the case 11 may be formed. Taper portion 18 provided on the
A and 18B do not necessarily have to be provided over the entire width of the facing side surfaces 11B and 11C, and the facing side surface 11
Even if provided only at both ends of the upper corners of B and 11C, they smoothly mesh with the taper portions 14B and 15B on the lower surfaces of the protruding portions 14A and 15A of the sandwiching portions 14 and 15 of the cover 12, and the switch case 11 and the cover 12 are covered. Can be easily combined.

As described above, according to the present embodiment, the elastic biasing force of the cover 12 made of the elastic thin metal plate and the depressions 16 and 17 formed in the thick corner portions of the side surfaces of the case 11 facing each other. The inclined surfaces of the inclined upper end surfaces 16A and 17A and the protruding portions 14A and 15A of the holding portions 14 and 15 of the cover 12
Means for preventing disengagement by engaging with a slanted upper surface with a large hanging margin, or by engaging a recessed portion 19A on the upper end surface of the recess 19 on the side surface of the case with a protruding portion 20A on the upper surface of the protruding portion 20 of the holding portion of the cover. As a result, the cover 12 is less likely to rattle with respect to the case 11, and the cover 12 is less likely to be removed from the case 11 even when an external force such as a slight impact is applied, and the opposite side surfaces of the outer periphery are flat without protrusions. be able to,
An electronic component of a type in which an opening of a resin-made box-shaped case accommodating an element is covered with a cover made of an elastic material can be realized at low cost without increasing the quantity and price of components and the number of assembly steps.

(Second Embodiment) Using the second embodiment,
The invention of claims 5 to 7 will be described.

The same components as those of the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

FIG. 6 is a front view of a push switch as an electronic component of a type in which an opening of a resin box-shaped case accommodating an element according to a second embodiment of the present invention is covered with an elastic material cover. 7 is an exploded perspective view of the same. As shown in FIG. 7, the push switch according to the present embodiment is different from that according to the first embodiment in that the upper surface of the case having the opening of the circular concave portion and this upper surface are The configuration of the cover plate portion of the cover that covers is different.

That is, as shown in FIG. 6 and FIG.
The cover plate portion 24 of the cover 23 has a flat plate shape, and
The central portion 22A having the opening of the circular recess 21A is raised and abuts against the lower surface of the cover plate portion 24, but the upper surface 22 of the opposite side surfaces 2 on both sides sandwiching the central portion 22A.
Both side portions 22B and 22C close to 1B and 21C are inclined so that their ends are separated from the lower surface of the cover plate portion 24.

Then, in the state shown in FIG. 6, flat plate-shaped holding portions 25 and 26 formed by bending two end portions of the cover plate portion 24 of the cover 23 facing each other are formed on the side surfaces 21B and 21C of the case 21 which face each other. Protruding portions 25A, 26A extending along both sides and provided inward from both lower ends thereof
The inclined upper surface of the case 21 is the side surface 21B facing the case 21,
21C of the cover plate portion 24 of the cover 23 so as to stably engage with the inclined upper end surfaces 27A and 28A of the depressions 27 and 28 provided at the predetermined heights at both corners, which are thick portions, of the cover 23, respectively. Similar to the case of the first embodiment, the elastic force urges the sandwiching portions 25 and 26, that is, the protruding portions 25A and 26A in the direction of being pulled upward.

Here, a method of assembling and fixing the cover 23 to the case 21 will be described with reference to the front views for explaining the combination method of FIGS. 8 (a) and 8 (b).

First, as shown in FIG.
1. The lower ends of the sandwiching portions 25, 26 of the cover 23 facing the tapered portions 29A, 29B provided at the portions where the upper ends of the facing side surfaces 21B, 21C of 1 and the inclined side portions 22B, 22C of the upper surface 22 intersect. Projections 25A and 26 on both sides
By engaging the taper portions 25B and 26B on the lower surface of A with the cover 23, the cover 23 is provided with a switch element and a push button 3.
The cover plate portion 24 of the cover 23 is pressed against the central portion 22A of the upper surface 22 of the case 21 as shown by a thin arrow in the drawing, as shown in FIG. The tips of the projecting portions 25A and 26A on both sides of the lower ends of the sandwiching portions 25 and 26 hit against the opposite side surfaces 21B and 21C of the case 21 and are spread out, so that the sandwiching portions 25 and 26 are elastically deformed.

Next, in this state, the ends of the cover plate portion 24 of the cover 23 where the holding portions 25 and 26 are bent and formed at the opposite ends are shown by two thick arrows in FIG. As shown in the drawing, the side portions of the flat cover plate 24 are pushed strongly from above so that the inclined side portions 2 of the upper surface 22 of the case 21
By pressing it against 2B and 22C, each holding portion 25,
26 The upper surfaces of the protrusions 25A and 26A on both sides of the lower end of the case 2 are attached to the case 2
1 is pushed down to a position lower than the upper end surfaces 27A, 28A of the depressions 27, 28 of the side surfaces 21B, 21C facing each other, and the protruding portions 25A, 26A are depressed 27 by the elastic restoring force of the sandwiched portions 25, 26 that have been spread. , 28 upper end surface 2
Engage it under 7A and 28A.

After that, when the pushing force applied to the end of the cover plate portion 24 of the cover 23 is removed, the elastically deformed cover plate portion 24 returns to the flat plate shape by the elastic restoring force, and as shown in FIG. The inclined upper surfaces of the projecting portions 25A and 26A of the sandwiching portions 25 and 26 are stably held on the inclined surfaces of the upper end surfaces 27A and 28A of the depressions 27 and 28 of the side surfaces 21B and 21C of the case 21, respectively.

In this embodiment also, the case 2 is used.
1 and the upper end surfaces of the depressions 27 and 28 of the side surfaces 21B and 21C facing each other, and the protruding portions 2 at the lower ends of the holding portions 25 and 26 of the cover 23.
As shown in FIG. 5, the configuration of the engaging portion with the upper surface of 5A, 26A is such that a concave portion is provided on the upper end surface of the depression on the side surface of the case, and a convex portion is provided on the upper surface of the projecting portion of the holding portion of the cover. According to the first embodiment, the protrusion of the holding portion of the cover may be more reliably and stably engaged / held in the recess on the side surface of the case by adopting a configuration in which the both are engaged. It is similar to the case.

As described above, according to the present embodiment, as in the case of the first embodiment, the cover 23 is less likely to rattle with respect to the case 21, and the cover 23 is not affected by some external force. 21. A type of electronic component that is hard to disengage from 21 and has a side surface facing the outer circumference that is flat without protrusions and that covers the opening of a resin-made box-shaped case containing an element with a cover made of an elastic material. In addition, it can be realized at low cost without increasing the number and price of constituent members and the number of assembling steps, and the upper surface of the cover of the electronic component is flat, which is advantageous for automatic mounting and the like.

FIG. 9 is a side view of a push switch having another structure according to the present embodiment, and FIG. 10 is an external perspective view of a cover used therefor. The structure of the part is different.

That is, the sandwiching portion 3 is provided at one end of two opposite sides of the flat plate-shaped rectangular cover plate portion 31 of the cover 30.
2, 33 are bent, and protrusions 32A, 33A (33A not shown) provided on both sides of the lower end of each of them are formed in the recesses 37 of the side surfaces 36B, 36C facing each other of the case 36.
38 (36C, 38 are not shown) is the same as that of the cover 23 described above, but the ends of the other two opposite sides are rectangular and cover the upper surface of the case 36. It is larger than the central flat plate portion 31A, and at the boundary between the enlarged sub flat plate portions 34, 35 and the central flat plate portion 31A, a linear half cut portion 34 shown by a dotted line in FIG.
A and 35A are provided.

The method of assembling the cover 30 with the case 36 is, as described above with reference to FIG. 8, sandwiching portions 32, 33 at opposite ends of the cover plate portion 31 of the cover 30.
Is strongly pressed against the end portion formed by bending,
After engaging the protrusions 32A, 33A of 33 with the recesses 37, 38 of the opposite side surfaces 36B, 36C of the case 36,
The sub-flat plate portions 34 and 35 of the cover plate portion 31 are bent by the half cut portions 34A and 35A in the direction along the side surfaces 36B and 36C of the case 36, as shown by the arrows in FIG.

By bending the sub flat plate portions 34 and 35 in accordance with the half cut portions 34A and 35A, the auxiliary flat plate portions 34 and 35 can be easily bent at accurate positions.

With such a structure, even if an external force is applied to the cover plate portion 31 of the cover 30 of the push switch, the cover plate portion 31 can be more difficult to deform than in the above case. Side surfaces 36 of the projecting portions 32A and 33A of the sandwiching portions 32 and 33 and the case 36 facing each other.
The engagement of the recesses 37 and 38 of B and 36C can be made more difficult to disengage.

The width dimension of the sub-flat plate portions 34, 35 along the half-cut portions 34A, 35A, which are bending lines, is set so that the side portions of the central flat plate portion 31A of the cover plate portion 31 are separated from the upper surface of the case 36. By setting the size to be equal to or larger than the specified size, the gap between the two is reduced to the sub flat plate portions 34, 35.
It can be closed with.

In this description, the cover plate portion 31 of the cover 30 has a rectangular shape, but it may be a rectangular shape having two opposite sides.

In Embodiments 1 and 2, a push switch operated by a push button is used as an example of an electronic component of a type in which an opening of a resin box-shaped case accommodating an element is covered with a cover made of an elastic material. Although described, the present invention can also be applied to an electronic component having no operation unit.

[0054]

As described above, according to the present invention, the urging force due to the elasticity of the cover and the large depressions formed in the thick corners of the opposite side surfaces of the case and the protrusions of the holding portion of the cover are large. Engagement at the hanging allowance and its disengagement prevention means prevent the cover from rattling with respect to the case, making it difficult for the cover to disengage from the case even if an external force such as a slight impact is applied, and projecting the opposite side faces of the outer periphery. An advantageous effect that an electronic component of a type that can be formed into a flat plane without a portion and that covers an opening of a resin box-shaped case accommodating an element with a cover made of an elastic material can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is a front view of a push switch as an electronic component according to a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an exploded perspective view of the same.

4A and 4B are front views illustrating a method of combining the cover and the case.

FIG. 5 is a partially enlarged front view of another configuration of the engaging portion of the case and the cover.

FIG. 6 is a front view of a push switch as an electronic component according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view of the same.

8A and 8B are front views illustrating a method of combining the cover and the case.

FIG. 9 is a side view of a push switch having another structure.

FIG. 10 is an external perspective view of the cover.

FIG. 11 is an external perspective view of a push switch as a conventional electronic component.

FIG. 12 is a front view of the same.

FIG. 13 is a side view of the same.

FIG. 14 is a front sectional view of the same.

FIG. 15 is an exploded front view of a partial section for explaining a method of combining the cover and the case.

[Explanation of symbols]

3 Push button 3A Upper end 4 Fixed contact 5 Connection terminal 6 Circular dome-shaped movable contact 11, 21, 36 Case 11A, 21A Circular recess 11B, 11C, 21B, 21C, 36B, 36C Side 12, 23, 30 Cover 12A Central circular Holes 13, 24, 31 Cover plate portions 13A, 22A Central portions 13B, 13C, 22B, 22C Side portions 14, 15, 25, 26, 32, 33 Clamping portions 14A, 15A, 20, 25A, 26A, 32A, 33
A protrusions 14B, 15B, 18A, 18B, 25B, 26B, 2
9A, 29B Tapered portion 16, 17, 19, 27, 28, 37, 38 Recess 16A, 17A, 27A, 28A Upper end surface 19A Recessed portion 20A Convex portion 22 Upper surface 31A Central flat plate portion 34, 35 Sub flat plate portion 34A, 35A Half cut Department

Claims (8)

[Claims] 1. A resin box shape having an outer shape of a quadrangle when viewed from the top, accommodating an element in a recess having an opening on its top surface, and having recesses of a predetermined height upward from the lower ends of both corners of opposing side surfaces. Of the case and the upper surface of the case is covered, the central portion abuts the upper surface of the case, and the end portions of both side portions sandwiching the central portion corresponding to the opposite side surfaces of the case are The cover plate portion is biased so as to be lifted by a predetermined dimension from the upper surface, and is extended along the opposite side surfaces of the case from the respective end portions of the raised both side portions, and is engaged with the recess on the inner side of the tip. The cover made of an elastic material composed of a flat plate-shaped holding portion having an inward protruding portion, and the above-mentioned case in cooperation with the upward urging force of both side partial ends of the cover plate portion of the cover. Above the opposite side depressions of An electronic component, which is provided with a detachment preventing unit that makes it difficult to disengage from the protrusion of the holding portion of the cover. 2. An inclination preventing means for preventing disengagement between the recesses on the opposite side surfaces of the case and the protrusions of the sandwiching portion of the cover is such that an angle of the upper end surface of the recess facing the side surface of the case is less than 90 °. The electronic component according to claim 1, wherein an upper surface of the protruding portion of the sandwiching portion is inclined so that a tip end portion is higher than a root portion. 3. Detachment prevention means for engaging the recesses on the opposite side surfaces of the case and the protrusions of the holding portion of the cover with the recesses on the upper end surfaces of the recesses and the recesses on the upper surface of the protrusions of the holding portion. The electronic component according to claim 1, wherein each of the convex portions is provided. 4. The upper surface of the case is flat, the central portion of the cover plate portion of the cover is brought into contact with the upper surface of the case, and each end of both side portions is bent in a direction away from the upper surface of the case. Item 2. The electronic component according to Item 2 or 3. 5. The electronic component according to claim 2, wherein the top surface of the case is inclined so that the central portion is high and the portions near the opposing side surfaces are low, and the cover plate portion of the cover is flat. 6. The outer shape of the case and the shape of the cover plate portion of the cover when viewed from the upper surface side are square, and both side portions of the cover plate portion are pressed downward to form depressions on the opposite side surfaces of the case and the cover. After engaging the protruding portion of the holding portion, a sub-flat plate portion that can be bent in a direction along the side surface of the case,
The electronic component according to claim 5, wherein the cover plate portion is provided at an end portion of another two sides different from the two opposite sides where the sandwiching portion is provided. 7. The half-cut portion is provided along the folding line of the sub-flat plate portion, and the width dimension of the sub-flat plate portion along the folding line is set so that both side portions of the cover plate portion of the cover are from the upper surface of the case. The electronic component according to claim 6, wherein the dimension is equal to or larger than the size of the raised portion. 8. A taper portion is provided at upper end corners of opposite side surfaces of the case to reduce an interval between the upper ends, and a protruding portion of each holding portion of the cover is formed such that a tip end portion of the lower surface is higher than a root portion. The electronic component according to claim 1.