JP2002223079A - Printed circuit board housing case for electronic equipment and printed circuit board mounting method - Google Patents

Abstract

(57) [Problem] To provide a printed circuit board housing case of an electronic device which can increase the degree of freedom in pattern design of a printed circuit board and can omit insulating paper. SOLUTION: A pair of opposed both sides 1a of a lower case 1 is provided.
1b is provided with a convex portion 3 protruding toward the center in the lower case 1 to support the printed circuit board 110, and is sandwiched between both side surfaces 2a and 2b of the upper case 2 to form the printed circuit board 110. Suppress vertical movement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a printed circuit board housing case for an electronic device and a printed circuit board mounting method.

[0002]

2. Description of the Related Art As a conventional method of mounting a printed circuit board on an electronic device, a method shown in FIGS. 8 and 9 is known. In the method shown in FIG. 8, a cut-and-raised portion 101 is formed on a part of the lower surface of the lower case 100, and a cut-out portion 102 that is in contact with the upper surface of the printed circuit board 110 is formed on each of both opposing side surfaces of the lower case 100. The printed board 110 is held by the cut-and-raised portion 101 and the cutout portion 102.

On the other hand, the method shown in FIG.
The lower case 1 is provided with an elastic material 111 having an insulating property such as silicon rubber as a spacer on a part of the lower surface of the lower case 1.
The printed circuit boards 110
A cutout portion 102 that contacts the upper surface is formed, and the printed circuit board 110 is held by the elastic member 111 and the cutout portion 102.

[0004] In either of the above two methods, an insulating paper (not shown) is interposed between the lower surface of the lower case 100 and the printed circuit board 110, and the printed circuit board 110 is removed.
The withstand voltage between the lower case 100 and the lower case 100 is increased. In addition,
This insulating paper is also interposed between the upper case 103 and the printed circuit board 110.

[0005]

In the conventional method of mounting a printed circuit board on an electronic device, a cut-and-raised portion 101 is formed on a part of the lower surface of the lower case 100, or an elastic member is formed on the lower surface of the lower case 100. 111 is attached to support the printed circuit board 110,
For the cut-and-raised portion 101 which is a metal material, in order to secure an insulation distance, it is necessary to consider avoiding a pattern or arranging an electronic component, and for the elastic member 111, Lands (for soldering electronic components on the pattern) must be considered,
For this reason, there has been a problem that the mounting density of the electronic components is reduced and the size of the printed circuit board 110 is increased. If the land is not taken into consideration, there is a possibility that the imbalance of the height with the other elastic members 111 may occur and the printed circuit board may not be held securely. There is also a problem that a withstand voltage failure occurs due to forgetting to insert insulating paper.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is possible to increase the degree of freedom in designing the pattern of a printed circuit board and to omit the insulating paper. The aim is to provide a method.

[0007]

According to a first aspect of the present invention, there is provided a printed circuit board housing case for an electronic apparatus, comprising: a rectangular lower case for housing a printed circuit board; and an upper case serving as a lid of the lower case. The printed circuit board storage case, wherein the lower case has a projection for supporting a printed circuit board projecting toward the center in the lower case on each of at least one pair of opposing surfaces, and the upper case includes: By fitting this into the lower case, it has at least one portion for holding the printed board supported by the respective convex portions of the lower case between the respective convex portions. I do.

According to this structure, the printed circuit board is supported by the projection provided on the lower case and is sandwiched between at least one portion of the upper case, so that the printed circuit board can be stably held. . In this case, since the protrusion does not cut off from the lower surface of the lower case, it is not necessary to avoid the pattern of the printed circuit board 110 or to dispose the electronic components. As a result, the degree of freedom in circuit design of the printed circuit board is increased, the mounting density of electronic components can be increased, and the size of the printed circuit board can be reduced. Further, since the printed circuit board 110 can be arranged near the bottom surface of the lower case 1, the thickness of the case can be reduced.

According to a second aspect of the present invention, there is provided the printed circuit board housing case of the electronic device according to the first embodiment, wherein the protrusion has at least two protrusions partially in a length direction of the printed circuit board. It is characterized by being provided separately.

According to a third aspect of the present invention, there is provided the printed circuit board housing case for an electronic device according to the first embodiment, wherein the protrusion is provided continuously along a length direction of the printed circuit board. It is characterized by having been done.

According to this structure, since the projections are formed continuously along the longitudinal direction of the printed circuit board, it is disadvantageous in terms of cost as compared with the case where the projections are formed partially, but the printed circuit board is securely held. This is advantageous in that it can be performed.

According to a fourth aspect of the present invention, there is provided a printed circuit board housing case for an electronic device according to any one of the first to third aspects, wherein the same protrusion as the protrusion is provided. It is provided on the same surface of the lower case and above by the thickness of the printed circuit board.

[0013] According to this configuration, since at least one pair of opposing surfaces of the lower case are provided with the protrusions above and below the printed board, the printed board can be held more securely.

According to a fifth aspect of the present invention, there is provided a printed circuit board housing case for an electronic device, wherein the printed circuit board housing case for an electronic device according to any one of the first to fourth aspects holds the printed circuit board of the upper case. The portion is provided with a projection at its tip, and the printed circuit board is provided with a hole into which the projection is fitted.

According to this configuration, by fitting the upper case into the lower case, the projection provided at the tip of the portion of the upper case that sandwiches the printed circuit board fits into the hole provided in the printed circuit board. In addition, the movement of the printed board in the longitudinal direction can be almost completely regulated, and the printed board can be held more reliably.

According to a sixth aspect of the present invention, there is provided a printed circuit board housing case for an electronic device, comprising a rectangular lower case for housing a printed circuit board, and an upper case serving as a lid of the lower case. The lower case has a projection for supporting a printed circuit board, which is disposed at least two apart from each of at least one pair of opposing surfaces, and protrudes toward the center of the lower case. The upper case has an opening at a position above each of the convex portions corresponding to the portion, and the upper case is fitted into the lower case on respective surfaces of the lower case overlapping with the respective surfaces on which the convex portions are provided. In this case, there is provided a projection for urging the printed circuit board in a state of being supported by the projections of the lower case through the openings.

According to this structure, the printed circuit board is supported by the protrusions provided on the lower case, and the printed circuit board is supported from above by the protrusions provided on the upper case through the openings provided above the respective protrusions of the lower case. Since the pressing is performed, the printed circuit board can be stably held. Further, since the convex portion is not cut from the lower surface of the lower case, the degree of freedom in circuit design of the printed board is increased, the mounting density of electronic components can be increased, and the printed board can be downsized. Further, since the printed circuit board 110 can be arranged near the bottom surface of the lower case 1, the case can be made thinner.

According to a seventh aspect of the present invention, there is provided the printed circuit board housing case for an electronic device according to any one of the first to sixth aspects, wherein the inner surface of each of the lower case and the upper case is provided. Is provided with an insulating layer.

According to this structure, since the insulating layers are provided on the inner surfaces of the upper and lower cases, the insulating paper can be omitted, and the step of inserting the insulating paper at the time of assembly becomes unnecessary. Defects can be prevented.

According to a eighth aspect of the present invention, there is provided a method of mounting a printed circuit board in a printed circuit board storing case of an electronic device, comprising: a rectangular lower case for storing the printed circuit board; and an upper case serving as a lid of the lower case. A method of providing a projection protruding toward a center in the lower case on each of at least one pair of opposing surfaces of the lower case to support the printed circuit board, and holding the upper case on the lower case. By being fitted into a case, the printed circuit board is urged by a part of the upper case to suppress the vertical movement of the printed circuit board.

According to this method, the printed circuit board is supported by the projection provided on the lower case, and the printed circuit board is pressed down from above by a part of the upper case, so that the printed circuit board can be stably held. Since the protrusion does not cut off from the lower surface of the lower case, it is not necessary to secure an insulation distance. As a result, the degree of freedom in circuit design of the printed circuit board is increased, the mounting density of electronic components can be increased, and the size of the printed circuit board can be reduced. Further, since the printed circuit board 110 can be arranged near the bottom surface of the lower case 1, the thickness of the case can be reduced.

[0022]

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

(Embodiment 1) FIG. 1 is a perspective view showing an appearance of a printed circuit board housing case of an electronic apparatus according to Embodiment 1 of the present invention, and FIG. 2 is a side view of the case.

In FIG. 1, the printed circuit board housing case of this embodiment comprises a lower case 1 for housing a printed circuit board 110 and an upper case 2 serving as a lid of the lower case 1. The upper and lower cases 1 and 2 are made of a metal material (for example, aluminum) having a thickness enough to be fitted to each other.

The lower case 1 is formed in a rectangular shape having three open sides as shown in the figure. 3 are provided two by two. The printed board 110 is supported by these convex portions 3.

That is, as shown in the side view of FIG. 2, both ends of the printed board 110 are supported from below.
Each convex portion 3 is formed by press working as shown in a vertical sectional view of FIG. An insulating layer 4 is formed on the inner surface of the lower case 1 as shown in FIG. 2 to increase the withstand voltage. Note that the insulating layer 4 can be formed by, for example, a resist used in an etching process.

On the other hand, the upper case 2 is formed in a substantially rectangular shape in which the surface on the side to be attached to the lower case 1 is opened, and the shorter side surfaces 2a and 2b are each formed in a substantially semicircular shape. Have been. Both sides 2a, 2b of this upper case 2
When the upper case 2 is fitted into the lower case 1,
Printed circuit board 110 supported by each projection 3
The printed circuit board 110 is formed to a length that allows the printed board 110 to be sandwiched between the projections 3 by an elastic biasing force generated by abutting the both ends in the longitudinal direction.

In this case, the upper and lower cases 1 and 2 are each processed to be joined at a predetermined position when they are overlapped with each other. The lengths of both side surfaces 2a, 2b are determined such that both side surfaces 2a, 2b of the first side 2a bias the printed circuit board 110. Thus, both sides 2 of the upper case 2
By determining the shapes of a and 2b, the printed board 110 can be pressed down, and the printed board 110 can be reliably held. This upper case 2 also has a lower case 1
Similarly, the insulating layer 4 (see FIG. 2) is formed on the inner surface.

As described above, the printed circuit board housing case of the present embodiment supports the printed circuit board 110 by the projections 3 provided on the lower case 1 and the two side surfaces 2 of the upper case 2.
The printed circuit board 110 can be stably held because the printed circuit board 110 is sandwiched between a and b. In this case, since the convex portion 3 is not cut and raised from the lower surface of the lower case 1, it is not necessary to avoid a pattern on the printed circuit board 110 or to dispose an electronic component. This allows
The degree of freedom in circuit design of the printed board 110 is increased, the mounting density of electronic components can be increased, and the printed board 110 can be downsized. Also, the printed circuit board 110
Can be arranged near the bottom surface of the lower case 1, so that the case can be made thinner.

Further, since the insulating layer 4 is formed on the inner surface of each of the lower case 1 and the upper case 2, the insulating paper can be omitted, and the withstand voltage failure due to forgetting to insert the insulating paper can be prevented. In the present embodiment, the protrusion 3
Are provided on each of the two side surfaces 1a and 1b of the lower case 1, but the number is not limited, and for example, three may be provided on each surface. The point is that it is only necessary to reliably support the printed circuit board 110, and it goes without saying that the number of the protrusions 3 is not limited.

(Embodiment 2) FIG. 4 is a side view of a printed circuit board housing case of an electronic apparatus according to Embodiment 2 of the present invention. In this figure, the same parts as those in FIG. 2 described above are denoted by the same reference numerals. The printed circuit board housing case of the present embodiment is an application of the printed circuit board housing case of the first embodiment described above, and the same protrusions 3 as the protrusions 3 are provided on the same surface of the lower case 1 and on the printed circuit board 110.
Is provided above by a thickness of

The projection 3 is newly formed above the printed circuit board 110.
Is provided, and the printed board 110 is sandwiched together with the lower protruding portion 3, whereby the vertical movement of the printed board 110 can be almost completely restricted, and the printed board can be held more reliably.

In this embodiment, four convex portions 3 are provided on both side surfaces 1a and 1b of the lower case 1, respectively.
As described above, the number is not limited, and for example, six may be provided on each surface.

(Embodiment 3) FIG. 5 is a perspective view showing the appearance of a printed circuit board housing case of an electronic device according to Embodiment 3 of the present invention. In this figure, the same parts as those in FIG. 1 described above are denoted by the same reference numerals. The printed circuit board housing case of the present embodiment is the same as that of the first embodiment described above.
In this case, the protruding piece 5 is formed at the tip of each of the surfaces 2a and 2b of the upper case 2 for urging the printed board 110, and the protruding piece 5 is fitted to the printed board 110. The hole 6 is formed.

By forming projections 5 at the ends of the surfaces 2a and 2b of the upper case 2 for urging the printed circuit board 110, and forming holes 6 in the printed circuit board 110 into which the projections 5 are fitted, When fitting 2 into lower case 1,
The protruding pieces 5 on the surfaces 2a and 2b of the upper case are fitted into the holes 6 of the printed circuit board 110. Thus, the movement of the printed board 110 in the longitudinal direction can be almost completely regulated, and the printed board can be held more reliably.

In the first to third embodiments, the protrusion 3
Is partially provided in the length direction of the printed circuit board 110,
It may be provided continuously along the length direction of the printed circuit board 110. In this case, processing is expected to take more time than in the case of partially forming, but it is advantageous in that the printed circuit board 110 can be held more reliably. In addition, even if the printed circuit board 110 is made of a material (for example, bake or paper phenol) that is easily deformed due to aging or the like, there is an advantage that partial deformation can be reliably suppressed.

(Embodiment 4) FIG. 6 is a perspective view showing the appearance of a printed circuit board housing case of an electronic apparatus according to Embodiment 4 of the present invention, and FIG. 7 is a side view of the case. In these figures, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.

The printed circuit board housing case of the present embodiment is an application of the printed circuit board housing case of the first embodiment described above. Instead of the embossed convex portion 3, a printed circuit board fixing tongue formed by notch processing is used. A piece 7 is formed on each of the lower case 1 and the upper case 2.

As shown in the side view of FIG. 7, the printed circuit board 110 is supported by the printed circuit board fixing tongue 7 formed on the lower case 1, and the printed circuit board 110 is supported by the printed circuit board fixing tongue 7 formed on the upper case 2. Since the pressing is performed from above, the vertical movement of the printed board 110 can be almost completely restricted, and the printed board 11
0 can be held.

In this case, the printed circuit board fixing tongue 7 of the upper case 2 needs to pass through the lower case 1 to reach the printed circuit board 110.
Opening 8 for letting through the printed circuit board fixing tongue piece 7
Is open. The opening 8 is located above (directly above) each printed circuit board fixing tongue 7 corresponding to each printed circuit board fixing tongue 7 of the lower case 1. Then, by fitting the upper case 2 into the lower case 1, the printed board fixing tongue pieces 7 of the upper case 2 reach the upper surface of the printed board 110 through the respective openings 8 of the lower case 1 and are urged.

In the present embodiment, two printed circuit board fixing tongue pieces 7 are provided on both side surfaces of the upper and lower cases 1 and 2, however, the number is not limited. Is also good. The reason is as described above.

[0042]

As described above, according to the present invention,
Since the printed board is sandwiched between the lower case and the upper case, the printed board can be reliably held. In addition, since the lower surface of the lower case is not partially cut or raised or a spacer is interposed unlike the conventional case, the pattern design of the printed circuit board can be freely performed, thereby increasing the mounting density of electronic components. As a result, the size of the printed circuit board can be reduced.
Further, since the insulating layer is formed on the inner surface of each of the upper and lower cases, the insulating paper can be omitted, and the withstand voltage failure due to forgetting to insert the insulating paper can be prevented. Furthermore,
In the assembling process, the step of attaching the insulating paper can be omitted, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an appearance of a printed circuit board housing case of an electronic device according to Embodiment 1 of the present invention.

FIG. 2 is a side view of a printed circuit board housing case of the electronic apparatus according to the first embodiment.

FIG. 3 is a longitudinal sectional view of a printed circuit board housing case of the electronic apparatus according to the first embodiment.

FIG. 4 is a side view of a printed circuit board housing case of the electronic device according to Embodiment 2 of the present invention.

FIG. 5 is a perspective view showing an appearance of a printed circuit board housing case of an electronic device according to Embodiment 3 of the present invention.

FIG. 6 is a perspective view illustrating an appearance of a printed circuit board housing case of an electronic device according to Embodiment 4 of the present invention.

FIG. 7 is a side view of a printed circuit board housing case of the electronic device according to the fourth embodiment.

FIG. 8 is a side view of a printed circuit board housing case of a conventional electronic device.

FIG. 9 is a side view of a printed circuit board housing case of a conventional electronic device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower case 1a, 1b side surface 2 Upper case 2a, 2b side surface 3 Convex part 4 Insulating layer 5 Projection piece 6 Hole 7 Printed circuit board fixing tongue piece 8 Opening 110 Printed circuit board

Claims (8)

[Claims] 1. A printed circuit board housing case for an electronic device, comprising: a rectangular lower case for housing a printed circuit board; and an upper case serving as a lid of the lower case, wherein the lower case has at least one set of Each of the opposing surfaces has a protrusion for supporting a printed circuit board projecting toward the center in the lower case, and the upper case is fitted into the lower case, whereby each of the protrusions of the lower case is A printed circuit board housing case for an electronic device, comprising: at least one portion for holding the printed circuit board in a supported state between the projections. 2. The printed circuit board housing case for an electronic device according to claim 1, wherein the projections are provided at least two apart in the longitudinal direction of the printed circuit board. 3. The printed circuit board housing case for an electronic device according to claim 1, wherein the convex portion is provided continuously along a longitudinal direction of the printed circuit board. 4. The apparatus according to claim 1, wherein the same convex portion as the convex portion is provided on the same surface of the lower case and upward by a thickness of the printed circuit board. 4. A printed circuit board housing case for an electronic device according to claim 1. 5. A projecting piece is provided at a tip portion of a portion of the upper case which sandwiches the printed board, and a hole is provided in the printed board for fitting the projecting piece. 5. The method according to claim 1, wherein:
A printed circuit board housing case for an electronic device according to any one of the above. 6. A printed circuit board housing case for an electronic device, comprising: a rectangular lower case for housing a printed circuit board; and an upper case serving as a lid of the lower case, wherein the lower case has at least one set of On each of the opposing surfaces, at least two are spaced apart from each other, and have printed circuit board supporting protrusions projecting toward the center in the lower case. The upper case has an opening at a position, and the upper case is fitted into the lower case on each of the surfaces of the lower case overlapping with the respective surfaces on which the protrusions are provided, so that the lower case passes through the openings. A printed circuit board housing case for an electronic device, comprising: a convex part for urging the printed circuit board in a state supported by each of the convex parts. 7. The printed circuit board housing case for an electronic device according to claim 1, wherein an insulating layer is provided on an inner surface of each of said lower case and said upper case. 8. A method for mounting a printed circuit board in a printed circuit board housing case of an electronic device, comprising: a rectangular lower case for housing a printed circuit board; and an upper case serving as a lid of the lower case. On each of at least one pair of opposing surfaces, a convex portion protruding toward the center in the lower case is provided to support the printed circuit board, and the upper case is fitted into the lower case by fitting the upper case into the lower case. A method of mounting a printed circuit board, comprising: urging the printed circuit board with a part of the printed circuit board to suppress the vertical movement of the printed circuit board.