JPH0738507B2 - Printed circuit board with case - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a printed circuit board with a case that is removably mounted inside a main device of a telephone, and in particular, an electrical connection portion on the printed circuit board side with a case is provided. The present invention relates to a printed circuit board with a case that is prevented from being connected in a state of being inclined with respect to an electric connection portion on the other side.

(Prior Art) For example, a printed circuit board with a case that is detachably mounted inside a main unit of a conventional telephone is electrically connected to an internal space of a box-shaped case 3 as shown in FIG. A printed circuit board 2 having a part 1 is fixed and stored. On the outer surface of the case 3, a pair of insertion guides 4 are provided on the upper side and the lower side when the printed circuit board is mounted so as to project along the insertion direction, and the insertion guides 4 serve as guide rails 6 for the main unit 5.
Insert the printed circuit board into the main device by guiding it to the groove of
The electrical connection portion 1 is engaged and connected to the electrical connection portion 7 on the other side provided at the back of the main device.

In FIG. 4, a situation in which the printed circuit board is mounted will be described step by step with reference to sectional views of the main device. FIG. 4A shows the insertion guide 4 of the printed circuit board 8 with the case and the guide rail 6.
It shows the state that it is inserted into the groove and started to be inserted. Case 3
In this case, the handle 9 is provided on the side opposite to the electrical connection portion of the printed circuit board so that the operator holds the handle 9 in and out. Here, for reference, an imaginary line 1 shows an ideal state in which the printed circuit board 8 with the case is completely attached. The gap A between the grooves of the guide rail 6 of the main device is made larger than the dimension B between the insertion guides of the case 3 to allow a margin for light insertion. The difference C between A and B is distributed so that the dimensional allowances D and E are provided on both the upper side and the lower side of the insertion guide 4 when the printed circuit board 8 with a case is completely mounted. This is because even if the positions of the components are varied, a play is provided to absorb the positional deviation so that the electric connection portions on the case-equipped printed circuit board side and the main device side fit into each other.

FIG. 4B shows a state in which the printed circuit board 8 with the case is inserted halfway.

FIG. 4 (c) shows a state in which the electrical connection portion 1 has started to engage with the electrical connection portion 7 on the main device side. Since the electrical connection portion uses, for example, a DIN connector or the like, its tip portion is chamfered, and the electrical connection portion 1 of the printed board 8 with a case is connected to the electrical connection portion 7 on the main device side. Invite me. Since the printed circuit board 8 with the case is lowered from the ideal state shown by the imaginary line by the amount of the margin D,
When the handle is held and pushed in, the electrical connection portion of the printed board with the case is guided and only D is lifted. However, the lower surface F of the case 3 on the side opposite to the electrical connection portion remains lowered.

FIG. 4D shows a state after the printed circuit board 8 with the case is pushed in to the end. The lower surface F of the case is in contact with the lower guide rail while being lowered. That is, since the printed circuit board with the case remains tilted, the connection work is completed while the upper part of the electrical connection part is completely inserted even though only the lower part of the electrical connection part is completely inserted.

Conventionally, the margin D has been reduced so that the uninserted portion on the upper side of the electrical connection portion is reduced to such an extent that there is no practical problem.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional one, the electrical connection portion of the printed circuit board with the case is essentially connected obliquely to the electrical connection portion on the main device side. The connection above the connection was basically incomplete. Therefore, (a) When the pushing amount of the printed circuit board with the case into the main device becomes small due to the variation in work, a contact failure is caused above the electrical connection portion.

(B) After bonding, when the main device itself shakes due to the vibration of the installation site and the printed circuit board with the case comes off, there is a drawback that the main device comes off first from above the electrical connection part.

(C) Also, the lower surface F of the case of the printed circuit board with the case
If the device is attached in a slanted position, the main unit may vibrate and the printed circuit board with a case inside may vibrate.
The printed circuit board with the case is caused to oscillate around the electrical connection part in the directions of arrows J and K. This oscillating motion in the J and K directions is a movement to pull out the printed circuit board with the case little by little. There was a drawback.

(D) If, during the insertion work, the upper electrical connection portion is not completely inserted and the printed circuit board with the case is tilted, the upper side of the case is pushed and the phantom line is shown in FIG. 4 (a). Even if the printed circuit board with the case is physically held even when the printed circuit board is mounted again in such an ideal state, only the frictional force between the connectors, which are the electrical connection portions, is retained. The case floats with a gap between the guide rail on the main device side and the margin D. Since the weight of the printed circuit board with the case is the moment to tilt the printed circuit board with the case, there is nothing that supports the outside of the space under the case.
Over time, the case on the opposite side of the electrical connection goes down,
There is a drawback in that the upper part of the electrical connection portion of the printed circuit board is slightly disengaged from the electrical connection portion of the other side and eventually returns to the state before being remounted to the ideal state.

According to the present invention, the electrical connection portion of the conventional printed circuit board with the case is connected in a state in which it is inclined with respect to the electrical connection portion of the other side, and even if it is installed so as not to incline, it takes time. Therefore, it is an object of the present invention to provide a printed circuit board with a case, which eliminates the inherent drawback of tilting after all and eliminates the drawbacks caused by it.

(Means for Solving the Problems) In order to solve the above problems, the present invention is directed to an outer surface of a case on a side opposite to a side where an electrical connection portion of a printed circuit board is installed.
Moreover, a supporting portion for supporting the printed circuit board together with the case is provided on the lower surface side of the printed circuit board when the printed circuit board is mounted.

(Function) Since the supporting portion is provided on the lower surface of the case and only on the side opposite to the electrical connecting portion, when the printed circuit board with the case is inserted along the guide rail of the main unit, the electrical characteristics of the printed circuit board are improved. Almost at the same time when the connection part is drawn into the electrical connection part on the main device side and lifted, the support part rides on the guide rail of the main device and lifts the side opposite to the electrical connection part of the printed circuit board from below. For this reason, the printed circuit board with the case is connected in a straight line in an ideal manner without tilting with respect to the electrical connection portion of the other side in which the main device is provided unlike the conventional case.

Further, since the supporting portion on the lower surface of the case supports the printed circuit board with the case even after mounting, it functions as a stopper that prevents further tilting regardless of the passage of time.

(Embodiment) An embodiment of the present invention will be described with reference to FIG. In FIG. 1, a supporting portion 10 is provided on the lower surface F of the case so as to project.
As described in the conventional example of FIG. 4 (a), the height of the support portion 10 is an allowance provided ideally between the lower surface of the case and the guide rail of the main device in the mounted state in order to facilitate the insertion work. Same as D. The shape of the support portion 10 is such that a slope G is provided so as to gradually increase from the lower surface F of the case toward the side opposite to the electrical connection portion 1 side, and then a flat surface portion H is provided. Others have the same structure as the conventional example.

FIG. 2 shows, step by step, how the printed circuit board 8 with a case of this embodiment is mounted on the main device 5 of the telephone.

FIG. 2A shows a state in which the printed circuit board 8 with a case is inserted partway inside the main device. In this case, the support
Since No. 10 has not yet climbed onto the guide rail of the main device, the lower surface F of the case rides on the guide rail 6 of the main device, as in the state of FIG. 4 (b).

FIG. 2B shows a state in which the electrical connection portion 1 has started to engage with the electrical connection portion 7 on the main device side. The electrical connection 1 is
Guided by the electrical connection portion 7 on the main device side, FIG. 4 (c)
Similar to the conventional example of No. 1, the margin D can be lifted. But,
In this embodiment, since the slope G of the support portion 10 simultaneously rides on the guide rail 6 of the main device at this time, the printed circuit board 8 with the case is lifted up together with the case 3.

FIG. 2C shows a state after the printed circuit board 8 with the case is pushed in to the end. The flat surface portion H of the support portion 10 completely rides on the guide rail 6, and the lower surface F of the case is lifted above the guide rail 6 by the above-mentioned margin D. In this way, the printed circuit board 8 with the case is mounted in the ideal state drawn by the imaginary line I in FIG. 4 (a),
After that, the state is maintained by the supporting portion 10.

(Effect of the invention) As described above, according to the present invention, by providing the support portion on the lower surface of the case opposite to the electrical connection portion, (a) in the final mounting state of the printed circuit board with the case,
The electrical connection does not tilt with respect to the electrical connection on the other side,
It has the advantage that it is connected in a straight and ideal shape, with the upper part of the electrical connection part not coming off.

(B) The work of lifting the lower surface of the printed circuit board with the case at the final timing of inserting it into the main device is that if the printed circuit board with the case is simply pushed in, the supporting part on the lower surface of the case will naturally lift, so anyone can do it. There is an advantage that even a person who does not know this can do it just by inserting the printed circuit board with the case, which is the same as the conventional work.

(C) Even after the printed circuit board with the case is attached, the support portion on the lower surface of the case has an advantage of keeping the attached state regardless of the passage of time.

In addition to the advantages (a) to (c) above, there are the following practical advantages. In other words, (d) Even if the pushing amount of the cased printed circuit board into the other side's electrical connection part is reduced due to work variations,
Since the upper part of the electrical connection portion is pushed in by the same amount as the lower part, there is an advantage that the conventional contact failure in the upper part is eliminated.

(E) Even if the main device vibrates due to the location of installation and the printed circuit board with the case vibrates, the swing range is halved compared to the conventional one, so there is an advantage that it is difficult to remove.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a sectional view of an essential part showing a mounting procedure of the embodiment, FIG. 3 is a perspective view of a conventional example, and FIG. It is a principal part sectional view which shows the mounting procedure of a prior art example. 1,7 ... Electrical connection part, 2 ... Printed circuit board, 3 ... Case, 5 ... Main device, 8 ... Printed circuit board with case,
10 ... Support section.

Claims (1)

[Claims] 1. A printed circuit board (2) having an electrical connection part (1), and a case (3) for accommodating the printed circuit board with the electrical connection part exposed to the outside. , When the electrical connection portion (1) is engaged with the counterpart electrical connection portion (7), both electrical connection portions (1),
A supporting portion (10) for lifting and supporting a bottom portion of the case opposite to the side of the electrical connecting portion is provided so that (7) is evenly engaged over the entire surface. And a printed circuit board with a case.