JPH07106777A - Electric apparatus - Google Patents

Abstract

PURPOSE:To provide an electric apparatus which can be manufactured at a low cost with high workability and can withstand strong impacts even when the apparatus is mounted with heavy components. CONSTITUTION:An electric apparatus is provided with a board 10 mounted with a plurality of electric or electrical components 11a, 11b, 11c, and 11d and a case member 13 in which the board 10 is fixed and supported. At least one internal surface of the member 13 has recessed sections 14a, 14b, 14c, and 14d at the positions corresponding to the top sections of the components 11a, 11b, 11c, and 11d mounted on the board 10 in projecting states so that the distances between the internal surface and tops of the components 11 can become nearly equal to each other. Then an elastic sheet member 12 is put between the recessed internal surface of the member 13 and tops of the parts 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device having a plurality of electric or electronic parts and having enhanced vibration resistance.

[0002]

2. Description of the Related Art As a vibration isolation measure for electric devices such as electric / electronic devices, communication devices, etc. equipped with a plurality of electric or electronic parts,
Conventionally, the method shown in FIGS. 3 and 4 has been carried out.

In the prior art shown in FIG. 3, a plurality of electrical or electronic components 31 mounted on a substrate 30 are attached with an adhesive / fixing sealing material 32 such as an RTV resin on the bases of the electrical or electronic components 31, so that the electrical or electronic components 31 can be attached. It is intended to be fixed, and the substrate 30 thus provided with the anti-vibration measure is the case 33.
Fixed inside.

In the prior art shown in FIG. 4, after fixing a substrate 40 on which a plurality of electric or electronic components 41 are mounted in a case 43, the upper portion of the electric or electronic components 41 in the case 43 is filled with a silicone resin 42. Then, the electric or electronic component 41 is fixed by being cured.

[0005]

However, the conventional technique as shown in FIG. 3 is an anti-vibration measure effective only when a vibration of at most about several G is applied to the electric device.
It is difficult to withstand a 14 G shock (for example, when mounted on an automobile). Moreover, if the mounted electrical or electronic components are light components such as ICs and transistors, and if they are heavy components such as power supply transformers and large-capacity capacitors, they are not subject to a large impact from the outside. It becomes totally helpless.

As shown in FIG. 4, if a case is filled with resin, it can withstand a relatively large impact, but since a large amount of expensive silicon resin must be used, the cost becomes high and it is necessary to replace parts. When it occurs, the cured resin has to be peeled off, which requires a lot of trouble. Further, the conventional techniques shown in FIGS. 3 and 4 also have a problem in that it takes time to cure the resin and workability during manufacturing is poor.

Therefore, the present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to provide a workable workmanufacturable device at a low cost and to mount a heavy component. Another object of the present invention is to provide an electric device capable of withstanding a large impact.

[0008]

The present invention relates to an electric device provided with a substrate on which a plurality of electric or electronic components are mounted and a case member for fixing and supporting the substrate inside.
In particular, according to the present invention, the inner wall is formed so that the distance between the top of each of the plurality of electric or electronic components mounted so as to project from the substrate in the direction of at least one inner wall of the case member and the inner wall is substantially constant. It has a protrusion at a position corresponding to the top of each electric or electronic component. An elastic sheet member that presses both of these protrusions and the top of the electric or electronic component is inserted.

It is desirable that the elastic sheet member is composed of one elastic sheet member having a substantially uniform thickness.

The substrate is preferably fixedly supported so as to be substantially parallel to the above-mentioned inner wall of the case member.

[0011]

The elastic sheet member is inserted between the protrusion provided on the inner wall of the case member and the top of the electric or electronic component mounted on the substrate so as to press the electric or electronic component. When the sheet member is sufficiently flexed, the vibration applied from the outside is absorbed. At this time, since the separation distance between the protrusion and the top of the electric or electronic component is substantially constant, the bending of the elastic sheet member against vibration is equal to each other at the position of the electric or electronic component. Therefore, the vibration of the substrate is suppressed, and the force applied to the electric or electronic components is suppressed to less than the strength that causes peeling of the solder when mounting the electric or electronic components.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view schematically showing the structure of an embodiment of a vibration-proof electric device of the present invention, and FIG. 2 is a partially enlarged view showing a part of FIG. 1 in an enlarged manner.

In these figures, reference numeral 10 is a substrate on which a plurality of electric or electronic components 11a, 11b, 11c and 11d are mounted. Examples of the electric or electronic parts include power transformers, other transformers with cores, relatively heavy parts such as large-capacity capacitors, and relatively small parts such as semiconductor parts, coils, small-capacity capacitors, and resistors, and Other various electric components or electronic components may be used. The size and shape of the mounted electric or electronic components 11a, 11b, 11c and 11d are arbitrary. However, the electric or electronic components 11a, 11b, 11c and 11d mounted in this embodiment are
Are different in height from each other in order to clarify the features of the present invention. The substrate 10 is fixed in a rigid case 13 made of metal, resin, or the like, and particularly, is firmly fixed and supported so that the mounting surface of the substrate is substantially parallel to the case inner wall 13a on the opposite side. .

On the inner wall 13a of the case 13, projections 14a, 14b, 14 projecting toward the tops of the electric or electronic components 11a, 11b, 11c and 11d, respectively.
c and 14d are integrally provided. Protrusion 14
The heights of a, 14b, 14c and 14d are such that the distance D between the tops of the electrical or electronic components 11a, 11b, 11c and 11d and the tips of the corresponding protrusions 14a, 14b, 14c and 14d is substantially constant. Each is predetermined. The dimensions except the shape and height of each protrusion are
It is appropriately set according to the shape of the top of the corresponding electric or electronic component.

Mounting parts 11a, 11b, 11c and 11
Between the top of d and the tips of the corresponding protrusions 14a, 14b, 14c and 14d, a sheet member 12 having a substantially constant thickness, such as a sponge-like rubber material, having a sufficient flexibility is inserted. Has been done. The thickness of the sheet member 12 is set to be sufficiently larger than the gap D between the top of the mounting component and the tip of the protrusion, and the sheet member 12 is inserted between the top of the mounting component and the tip of the protrusion to close the case 13. When it is bent, it is largely bent and presses both the inner wall and the mounting component, and thus the mounting component is pressed toward the board.

This proper bending of the sheet member 12 elastically presses the electric or electronic components 11a, 11b, 11c and 11d, so that the vibration of the substrate 12 is suppressed. In particular, since the gap D between the top of each mounted component and the tip of the corresponding protrusion is substantially constant, the amount of bending of the sheet member 12 is equal at each component position. Therefore, even when components having different heights are mounted, a uniform force acts on each component, the vibration of the substrate is surely suppressed, and the stress applied to the solder portion of the component is extremely small ( (Below the strength at which solder peeling occurs).

As described above, according to this embodiment, at the time of manufacture,
The workability is very good because it is sufficient to mount the substrate 10 on which the electric or electronic components 11a, 11b, 11c and 11d are mounted, to mount the sheet member 12 on it and to close the case 13, and Since no filling resin is used, it can be manufactured at low cost. Further, since it is a method of elastically pressing the electric or electronic parts 11a, 11b, 11c and 11d by bending of the sheet member 12, it is possible to sufficiently withstand a large impact even when a heavy part is mounted. It becomes possible.

The elastic sheet member according to the present invention may be a single elastic sheet having a substantially uniform thickness, or may be a stack of a plurality of flexible sheets or a plurality of flexible sheets arranged side by side. They may be arranged side by side. The material of the elastic sheet member is not limited to the sponge-like rubber material as long as it is a soft and sufficiently flexible sheet and may be any material.

The substrate need not be supported substantially parallel to the inner wall. However, even in that case, the height of the protrusion is determined such that the gap between the top of the mounted component and the tip of the protrusion is substantially constant.

The embodiments described above are merely illustrative and not limitative of the present invention, and the present invention can be implemented in various other modified modes and modifications. Therefore, the scope of the present invention is defined only by the claims and their equivalents.

[0022]

As described above in detail, according to the present invention, the top wall of each of a plurality of electric or electronic components mounted so as to project from the substrate in the direction of at least one inner wall of the case member is separated from the inner wall. This inner wall has protrusions at positions corresponding to the tops of the electric or electronic components so that the distance is substantially constant, and the elastic force that presses the protrusions and the tops of the electric or electronic components against each other is provided. Since the sheet member is inserted, the deflection of the elastic sheet member against vibration is equal to each other at the positions of the electric or electronic components. Therefore, the vibration of the substrate is effectively suppressed, and the force applied to the electrical or electronic components is suppressed to less than the strength that causes the peeling of the solder when mounting the electrical or electronic components. Moreover, since no filling resin is used, the workability is good and the manufacturing can be performed at low cost. Further, since this is a method of elastically pressing in an electric or electronic component by bending the elastic sheet member, it is possible to sufficiently withstand a large impact even when a heavy component is mounted.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing the configuration of an embodiment of an electric device of the present invention.

FIG. 2 is a partially enlarged view showing a part of FIG. 1 in an enlarged manner.

FIG. 3 is a cross-sectional view schematically showing an example of an electric device according to the related art.

FIG. 4 is a sectional view schematically showing an example of an electric device according to the related art.

[Explanation of symbols]

 10 Substrate 11a, 11b, 11c, 11d Electric or Electronic Component 12 Sheet Member 13 Case 13a Inner Wall 14a, 14b, 14c, 14d Projection Part

Claims (3)

[Claims] 1. An electric device comprising: a board on which a plurality of electric or electronic components are mounted; and a case member for fixing and supporting the board therein, wherein the board extends in the direction of at least one inner wall of the case member. The inner wall has a protrusion at a position corresponding to the top of each of the electric or electronic components so that the distance between the top of each of the plurality of electric or electronic components and the inner wall protruding from the inner wall is substantially constant. An electric device having an elastic sheet member having a pressing force between the protrusion and the top of the electric or electronic component. 2. The electric device according to claim 1, wherein the elastic sheet member is composed of one elastic sheet member having a substantially uniform thickness. 3. The electric device according to claim 1, wherein the substrate is fixed and supported so as to be substantially parallel to the inner wall of the case member.