JPH11126986A - Mounting device of circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow smooth attaching/detaching of circuit board from a case main body, by forming a protruding part which displaces an engagement hook in anti-engagement direction under pressure at a position, outside the case body, corresponding to the engagement hook. SOLUTION: A synthetic resin case body 10 comprises an engagement hook 11 protruding upper side and a pair of guide parts 12 and 13 which, extending in the same direction as the engagement hook 11, face each other with the engagement hook 11 in between, and the guide part 12 formed into L-shape while the guide part 13 into U-shape, so configured as to guide the side surface of a circuit board along insert direction. At a position outside the case body 10 corresponding to the engagement hook 11, a protruding part 16 extending in opposite directions is formed in the extension direction of the engagement hook 11. The protruding part 16 and the engagement hook 11 are formed to a reed-like part 10b formed through a slit 10a from the case body 10, while continuous and independent deformation allowed. Thus, the circuit board is smoothly attached/detached from the case body 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit board mounting apparatus in which a circuit board is mounted and fixed in a case body through an engaging hook formed in a resin case body. The present invention relates to a circuit board mounting device employed in the device.

[0002]

2. Description of the Related Art Conventionally, for example, in an instrument device for a vehicle, in addition to a main circuit board for instrument driving / illumination, an indicator device for displaying various information and a warning display and optional devices corresponding to a vehicle type are provided. A circuit board for driving (hereinafter simply referred to as a circuit board) may be incorporated,
When mounting such a circuit board in an instrument case (case body), an engagement hook is formed in the instrument case,
The attachment is generally performed by engaging the engaged portion of the circuit board with the engagement hook.

FIGS. 4 to 7 show an example of such a general mounting structure of a circuit board. FIGS. 4 and 5 are perspective views of a main part showing a mounting state of the circuit board and sectional views thereof. , 7
FIGS. 4A and 4B are a sectional view of a main part and a front view thereof showing a state of attachment. In FIGS. 4 and 5, a case body 1 has an engaging hook 2 protruding upward in FIG. And a guide wall 3 opposed to each other with the engaging hook 2 interposed therebetween, and the circuit board 4 is provided with an engaged portion 5 in the form of an opening at substantially the center thereof, as shown in FIGS. As described above, the case body 1 is
The head 2a of the engaging hook 2 is engaged with the engaged portion 5 of the circuit board 4 so that the circuit board 4 is mounted and fixed in the case body 1.

[0004]

However, in such a circuit board mounting structure, as shown in FIG. 6, the circuit board 4 is inserted along the guide wall 3 in the direction of arrow A, and When the end face of the substrate 4 presses the inclined surface of the head of the engagement hook, the deformation hook in the direction of arrow B normally acts on the engagement hook 2 so that the engagement hook 2 bends in the direction of arrow B and the circuit board 4 is inserted, but the deformation stress acts in the direction of arrow C, and the circuit board 4 may not be inserted smoothly.
Such a state is remarkable when burrs are present on the end face of the circuit board 4, which not only deteriorates the assembling workability but also causes the engaging hook 2 or the circuit board 4 to be damaged by forcible insertion of the circuit board. There is.

Further, in such a circuit board mounting structure, it is not easy to remove the circuit board 4 after the mounting, and if it is forcibly removed, the engaging hook 2 or the circuit board 4 is also damaged. It's easy to do.

[0006] The present invention has been made in view of the above, and an object of the present invention is to provide a circuit board mounting apparatus capable of smoothly attaching and detaching a circuit board to and from a case body.

[0007]

According to the present invention, in order to achieve the above object, a circuit board is formed by engaging an engaging hook projecting inside a case body with an engaged portion formed on the circuit board. In a device for mounting a circuit board mounted in a case body, a projection is formed at a position corresponding to the engagement hook outside the case body to displace the engagement hook in the anti-engagement direction by pressing. It is characterized by the following.

Further, the present invention is characterized in that the engaging hook and the protruding portion are formed on a tongue piece which is formed so as to be independently deformable continuously from the case body.

[0009]

According to the apparatus for mounting a circuit board according to the present invention, it extends along the extending direction of the engaging hook and is engaged by pressing at a position outside the case body corresponding to the engaging hook. By forming the protrusion for displacing the hook in the anti-engaging direction, the engaging hook can be easily displaced, and the circuit board can be smoothly attached to and detached from the case body.

[0010] Further, since the engaging hook and the protruding portion are formed on the tongue piece which is formed so as to be independently deformable continuously from the case body, the displacement of the engaging hook through the protruding portion becomes easy.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a mounting apparatus for a circuit board according to the present invention; FIG.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing a circuit board and a main part of a case body, FIG. 2 is a sectional view showing an assembled state of FIG. 1, and FIG.
FIG. 4 is a cross-sectional view of a main part when a circuit board is mounted.

In FIG. 1, an instrument case (case body) 10 made of a synthetic resin has an engaging hook 11 protruding upward in the drawing, and extends in the same direction as the engaging hook 11 in the figure. A pair of guide portions 12 and 13 opposed to each other with the hook 11 interposed therebetween. The guide portion 12 is formed in an “L” shape, and the guide portion 13 is formed in a “U” shape. It is configured to be able to guide along the insertion direction. The circuit board 20 includes a connector 21 electrically connected to, for example, an indicator device (not shown) on one surface thereof.
And an engaged portion 22 having an opening hole shape corresponding to.

When the circuit board 20 is inserted into the bottom of the case body 10 along the guides 12 and 13 of the case body 10, the engaging portions 15 formed on the base side of the head 14 of the engaging hooks 11 are formed. The engagement with the engagement surface 23 formed on the engaged portion 22 of the circuit board 20 causes the circuit board 20 to be attached and fixed in the case body 10 (see FIG. 2).

Here, at a position outside the case body 10 and corresponding to the engaging hook 11, a projecting portion 16 is formed which extends in a direction opposite to the extending direction of the engaging hook. Hereinafter, the function of the protruding portion 16 will be described. In the case of the present embodiment, the protruding portion 16 and the engaging hook 11 are connected to the tongue piece 10b formed continuously and independently deformable from the case body 10 via the slit 10a. Is formed.

In FIG. 4, the end surface of the circuit board 20 inserted in the direction of the arrow A along the guide portions 12 and 13 is in contact with the inclined surface 17 formed on the head portion 14 of the engagement hook 11, In this state, a stress in the direction of arrow B acts on the engaging hook 11 and the engaging hook 11 bends in the direction of arrow B to move the circuit board 20 to the bottom side.
When the frictional force between the engaging hook 11 and the inclined surface 17 is large due to the presence of burrs on the end surface of the hook, the stress in the direction of arrow C acts on the engaging hook 11 and the movement of the circuit board 20 becomes difficult, so that the hook is inserted. It may be difficult.

As described above, when it is difficult to insert the circuit board 20 or when the end face of the circuit board 20 is
When the protruding portion 16 is pressed in the direction of arrow D at all times when it comes into contact with the circuit board 20 or when the circuit board 20 is inserted, the engaging hook 11 is moved as shown by a dashed line in FIG.
Since each of 0b is easily displaced in the separating (anti-engaging) direction with respect to the circuit board 20, the insertion movement of the circuit board 20 becomes easy and smooth.

When removing the circuit board 20,
As shown in FIG. 2, when the projecting portion 16 is pressed in the direction of arrow D, the engaging hook 11 is disengaged from the circuit board 20 together with the tongue piece 10b as shown by a dashed line in FIG. The engagement hook 11 is easily displaced in the
The state of engagement between the engaging portion 15 of the (case body 10) and the engaging surface 23 of the engaged portion 22 (circuit board 20) can be easily and smoothly released.

As described above, in this embodiment, the engaging hook 11 is extended outside the case body 10 at a position corresponding to the engaging hook 11 in a direction opposite to the extending direction of the engaging hook 11 and engaged by pressing. By forming the projection 16 for displacing the mating hook 11 in the anti-engaging direction, the engaging hook 1
1 can be easily displaced, and the case 10
The circuit board can be smoothly attached to and detached from the
Thereby, the workability of attaching and detaching the circuit board 20 is improved, and the engagement hook 11 and the circuit board 10 can be prevented from being damaged.

Further, in this embodiment, the engaging hook 11 and the projecting portion 16 are formed on the tongue piece 10b formed so as to be independently deformable continuously from the case body 10, so that the projecting portion 1 is formed.
Although the ease of displacement of the engaging hook 11 through the hook 6 can be enhanced, there is no need to particularly provide such a tongue piece 10b, and the projecting portion 16 formed continuously from the engaging hook 11 downward is formed. The engaging hook 11 is
At the same time, the lever acts with the base at the base,
It is sufficient that the engagement hook 11 is configured to be displaced.

[0021]

As described above in detail, according to the present invention, the circuit board is attached to the case body by engaging the engaging hook projecting from the inside of the case body with the engaged portion formed on the circuit board. In the apparatus for mounting a circuit board, a projecting portion for displacing the engaging hook in the anti-engaging direction by pressing is formed at a position corresponding to the engaging hook outside the case body. Therefore, it is possible to provide an apparatus for mounting a circuit board on which a circuit board can be smoothly attached and detached.

Further, according to the present invention, the engaging hook and the protruding portion are formed on a tongue portion formed so as to be capable of being independently deformed continuously from the case body. The ease of displacement can be increased.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a circuit board and a main part of a case body according to an embodiment of the present invention.

FIG. 2 is a sectional view showing an assembled state of FIG. 1;

FIG. 3 is an essential part cross-sectional view showing a state where the circuit board is mounted.

FIG. 4 is a perspective view of a main part showing a conventional example.

FIG. 5 is a sectional view of FIG. 4;

FIG. 6 is a cross-sectional view of a main part when the circuit board is mounted.

FIG. 7 is a front view of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Instrument case (case body) 10b Tongue piece part 11 Engagement hook 16 Projection part 16 20 Circuit board 20

Claims (2)

[Claims] 1. A circuit board mounting apparatus comprising: a housing for mounting a circuit board in a case body by engaging an engagement hook formed on the inside of the case body with an engaged portion formed on the circuit board. A mounting device for a circuit board, wherein a protruding portion for displacing the engaging hook in the anti-engaging direction by pressing is formed at a position corresponding to the engaging hook outside the body. 2. The circuit board mounting according to claim 1, wherein said engaging hook and said projecting portion are formed on a tongue piece which is formed so as to be continuously and independently deformable from said case body. apparatus.