JPH09321463A - Case body structure of electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the effective mounting area of a wiring board without having the effect of screw clamping or the like and moreover, to prevent the generation of an irregularity in the setting-up of the case body structure of an electronic equipment by a method wherein a tapering projected part is formed on either of a front case and a rear case and a recessed part or a hole, into which the projected part can be fitted, is bored in the other of either of the front case and the rear case and the wiring board. SOLUTION: A loose hole 21 having a spot facing hole 20 is bored in a front case 18 and the hole 21 is formed in such a hole diameter as a screw 4 can be easily inserted in the hole 21. A boss 22 of the same core as that of the hole 21 is formed in the case 18. A step 23 having a height lower than the plate thickness of a wiring board 3 and a truncated cone-shaped projected part 24 projecting in the direction lower than the step 23 are formed on the boss 22. A boss 25 is projected on a rear case 19 and a cone-shaped recessed part 26, into which the part 24 can be fitted, is formed in the boss 25. The screw 4 can be inserted in a screw hole 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing structure of a small electronic device such as a portable communication device.

[0002]

2. Description of the Related Art In small electronic devices such as portable communication devices,
The housing and the wiring board housed in the housing are positioned and then fixed by screws. In particular, a small portable communication device has an antenna built in as a part of the housing structure, and the antenna is formed on either the housing or the wiring board, or the housing and the wiring board. Since the tuning of the antenna depends on the positional relationship between the housing and the wiring board, a high positional accuracy of the wiring board is required.

A housing structure of a conventional small electronic device such as a portable communication device will be described with reference to FIGS. 9 to 11.

A housing of a small electronic device such as a portable communication device is composed of a front case 1 and a rear case 2, and the front case 1 and the rear case 2 are combined with each other,
The wiring board 3 is clamped and is assembled by the screw 4.

A play hole 6 having a counterbore hole 5 is formed in the front case 1, and the play hole 6 has a diameter such that the screw 4 can be easily inserted.

A boss 7 is projectingly provided in the rear case 2 at a position corresponding to the play hole 6, and a screw hole 8 into which the screw 4 is screwed is bored in the boss 7.

A hole 9 is formed at a position corresponding to the play hole 6 of the wiring board 3, and the screw 1 can be loosely fitted in the hole 9.

The play hole 6 and the hole 9 of the wiring board 3 are aligned with the position of the boss 7, the screw 4 is inserted into the play hole 6 and the hole 9, and screwed into the screw hole 8 of the boss 7. To do.

FIG. 9 shows a state in which the front case 1, the rear case 2, and the wiring board 3 are correctly positioned. The play hole 6 and the play hole 9 have a hole diameter with a sufficient margin so that the screw 4 can be easily inserted and an error between parts can be absorbed, and the screw 4 and the play hole 6,
The clearance between the holes 9 causes variations after assembly. Further, when screwed, the front case 1 and the wiring board 3 are inevitably moved with the rotation of the screw 4, and as shown in FIGS. The wiring board 3 and the front case 1 are misaligned.

FIG. 12 shows another conventional example in which positioning corner ribs 10a and side ribs 10b are provided so that the front case 1, the rear case 2 and the wiring board 3 can be accurately positioned during assembly. The figure shows a state in which the front case 1 is removed.

3 at one corner inside the rear case 2
A corner corner rib 10a is formed, and a rectangular side rib 10b is formed on one of opposite sides of the corner portion. Wiring board 3
The corners were abutted against the corner ribs 10a and one side was pressed against the side ribs 10b for positioning, and then fixed by the screws 4.

FIGS. 13 and 14 show still another conventional example, in which a box-shaped rear case 2 is provided with a boss 7 for a screw 4 so as to be positioned at a position away from the boss 7 by a required distance. The boss 11 is provided so as to project, and the positioning pin 12 is provided so as to project from the upper surface of the positioning boss 11.

The wiring board 3 is provided with a hole 9 at a position corresponding to the boss 7 and a positioning hole 13 at a position corresponding to the positioning boss 11, and the positioning pin 12 is fitted into the positioning hole 13. Are combined.

The wiring board 3 is supported by the boss 7 and the positioning boss 11, and the positioning pin 12 is fitted into the positioning hole 13 to determine the position.
It is fixed by the screw 4.

FIG. 15 shows still another conventional example, in which a step portion 14 is provided along the inner circumference of the rear case 2, and one inner wall surface of the rear case 2 is provided with one side surface of the wiring board 3. The position of the wiring board 3 is determined by bringing the wiring board 3 into contact with the wiring board 3, and the wiring board 3 is supported by the step portion 14.

[0016]

SUMMARY OF THE INVENTION
In the case structure of the conventional electronic device, the positions of the front case 1 and the wiring board 3 may be displaced from each other by the allowance of the holes, and if the positions are displaced from each other, the antenna tuning may be disturbed. If the rear case 1 and the rear case 2 are misaligned, the steps are conspicuous and the appearance is bad. Further, when the corner ribs 10a and the side ribs 10b are provided for positioning as shown in other conventional examples, the number of parts is increased and the cost is increased. Further, although the positioning when mounting the wiring board 3 on the rear case 2 can be accurately performed, the wiring board 3 may rotate together with the rotation of the screw 4 when screwed, and the wiring board 3 may be displaced. Furthermore, the positioning boss 1
When 1 and the positioning hole 13 are provided, the mounting effective area of the wiring board 3 is reduced because the number of holes of the wiring board 3 is increased. When the side surface of the wiring board 3 is pressed against the inner wall of one end of the rear case 2 and supported by the step portion 14, variations occur in the gap at the other end of the rear case 2 and the wiring board is in contact with the step portion 14. There was a problem such as the reduction of the effective mounting area.

The present invention has been made in view of the above situation, and has a large mounting effective area of a wiring board without being affected by screw tightening and the like, and a casing structure of an electronic device having no variation in assembly. Is to provide.

[0018]

According to the present invention, a tapered protrusion is formed on either the front case or the rear case, and the protrusion is formed on the other of the front case or the rear case and the wiring board. The present invention relates to a housing structure of an electronic device in which a recess or a hole that can be fitted is formed, and a boss is formed in each of the front case and the rear case, and a play hole is formed in one of the bosses of the front case and the rear case. The present invention relates to a housing structure of an electronic device in which a protrusion is formed on one side of the boss and a recess is formed on the other side, and a step is provided on the protrusion, and a wiring board can be fitted into the step, and a front structure. A hole is formed in one of the case and the rear case, and a boss is formed in the other of the front case and the rear case. The boss is the wiring board, the front case, and the rear case. The present invention relates to a housing structure of an electronic device in which a protruding portion of the shaft is protruded and the protruding portion of the shaft is thermally crimped, and a boss is formed on either the front case or the rear case. A protrusion is formed on the other of the front case and the rear case, and a fixing hole eccentric to the protrusion is formed on the other side, and a hole and a fixing hole into which the protrusion can be fitted are formed on the wiring board. A housing structure of an electronic device in which the protrusion and the hole can be fitted, and the front case and the rear case are fixed, and at the same time, not only the housing but also the wiring board can be positioned, and the protruding portion fits into the recess. By doing so, the positional accuracy is improved.

[0019]

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

In FIG. 1, 18 is a front case and 19 is a rear case. The front case 1
8. The rear case 19 is united, the wiring board 3 is held, and screwed by the screw 4.

The front case 18 has a counterbore hole 20.
A play hole 21 having a hole is formed, and the play hole 21 has the screw 4
Has a hole diameter that allows easy insertion. A boss 22 that is concentric with the play hole 21 is formed in the front case 18, and a step 23 having a height lower than the plate thickness of the wiring board 3 and a truncated portion projecting downward from the step 23 are formed on the boss 22. A conical protrusion 24 is formed.

A boss 25 is projectingly provided on the rear case 19, and a mortar-shaped recess 26 into which the projecting portion 24 can be fitted is formed on the boss 25. A screw hole 27 concentric with the recess 26 is formed in the boss 25, and the screw 4 can be screwed into the screw hole 27.

The wiring board 3 is provided with a hole 28 having substantially the same diameter as that of the base end of the protrusion 24, and the hole 28 is formed in the step 2.
3 can be fitted.

The wiring board 3 is placed on the boss 25,
The center of the hole 28 and the recess 26 are aligned with each other, and the front case 18 is covered. The protrusion 24 is the hole 28.
And is fitted into the recess 26. At the same time, the step 23
Engages with the hole 28. The screw 4 is inserted into the play hole 21 and screwed into the screw hole 27 of the boss 25 to be tightened.
By tightening the screw 4, the centers of the wiring board 3 and the boss 22 are aligned by the centering action of the protrusion 24 and the recess 26, and further, the wiring board 3 has the step 2
The centers of the boss 22 and the boss 25 are aligned with each other through the line 3, and the wiring board 3 is held by the boss 22 and the boss 25.

FIG. 2 shows another embodiment of the present invention, in which the front case 18 has a play hole 2 having a counterbore hole 20.
1, the rear case 19 is provided with a boss 25. A step 23 having a height lower than the plate thickness of the wiring board 3 is formed on the boss 25, and a truncated cone-shaped protrusion 24 is provided on the upper end side of the step 23. The protrusion 24
A recess 26 into which the protrusion 24 can be fitted is formed in the boss 22 provided so as to face the above.

A hole 28 having substantially the same diameter as the base end portion of the projecting portion 24 is formed in the wiring board 3 so that it can be fitted into the step 23.

The play hole 21, the hole 28, and the protruding portion 2
4 are put together and screwed by the screw 4. At the same time when the screw 4 is tightened, the projecting portion 24 is fitted into the recessed portion 26, and the front case 1, the wiring board 3, the rear case are formed by the centering action of the tapered shape of the projecting portion 24 and the recessed portion 26. 2 is automatically positioned.

FIG. 3 shows still another embodiment of the present invention, in which a front case 18 is provided with a play hole 21 having a counterbore hole 20, and the front case 18 extends from the counterbore hole 20. It has a cylindrical boss 29 that projects. The center of the boss 29 is the play hole 21, and a conical recess 30 is formed in the vicinity of the play hole 21. A rear case (not shown) is provided with a cylindrical boss 31 corresponding to the play hole 21 and having a diameter substantially the same as that of the boss 29. The boss 31 has a conical shape at a position corresponding to the recess 30. The protrusion 32 is provided so as to project.

The wiring board 3 has a hole 2 through which the screw 4 penetrates.
8 is provided, a positioning hole 33 is provided near the hole 28, and the projection 32 can be fitted into the positioning hole 33.

The boss 29, the wiring board 3, and the boss 31 are put together, the protrusion 32, the positioning hole 33, and the recess 30 are fitted and screwed by the screw 4.

Then, the front case 18, the wiring board 3, and the rear case are screwed together, and at the same time, the projection 32 is positioned by the centering action when the projection 32 is fitted into the positioning hole 33, and the screw 4 It is not affected by the rotation of.

FIGS. 4 and 5 show still another embodiment, in which a front case 18 is provided with a play hole 21 having a counterbore hole 20.

A boss 34 is projected on the rear case 19,
A pin 35 is provided so as to project from the center of the boss 34.
Can penetrate through the play hole 21. A conical projection 32 is provided in the vicinity of the pin 35.

The wiring board 3 is provided with a hole 28 through which the pin 35 passes, and a positioning hole 33 is provided in the vicinity of the hole 28.
And the positioning hole 33 can be fitted with the protrusion 32.

The pins 35 of the boss 34 are connected to the wiring board 3
The hole 28 of the front case 18 is inserted into the play hole 21 of the front case 18, the protrusion 32 is fitted into the positioning hole 33, and the tip end of the pin 35 protruding from the front case 18 is heated and caulked.

Thus, the front case 18, the wiring board 3, and the rear case 19 are positioned by heat caulking at the same time.

6 and 7 show still another embodiment of the present invention, in which the front case 18 has a play hole 21 having a counterbore hole 20, and a frustoconical recess centered on the play hole 21. Two
6 are formed.

The rear case 19 is provided with a boss 34,
The boss 34 has a step 2 raised by the thickness of the wiring board 3.
3 is provided, and a frustoconical projection 24 is provided from the step 23.
Is formed, and a pin 35 is projectingly provided at the tip of the projecting portion 24.

A hole 28 having substantially the same diameter as the base end portion of the protruding portion 24 is formed in the wiring board 3.

The pin 35 of the boss 34 is inserted into the hole 28 and the play hole 21, and heat is applied to the pin 35 to perform heat caulking.

As a result, the front case 18, the wiring board 3, and the rear case 19 can be positioned at the same time when the heat caulking is performed, and the projection 25 is fitted into the recess 26 so that the positional deviation does not occur.

Although the hole 28 and the positioning hole 33 are individually formed in the wiring board 3 shown in FIGS. 3 to 5, a gourd-shaped hole 36 as shown in FIG. 8 is formed. May be.

[0043]

As described above, according to the present invention, the protrusion is provided on one of the front case and the rear case, and the recess is provided on the other, so that the protrusion and the protrusion can be screwed or heat-crimped at the same time. Since the recess is fitted and the wiring board is provided with a hole having substantially the same diameter as the base end portion of the projecting portion, the wiring board and the projecting portion are fitted together, and the front case is formed. The rear case and the wiring board are naturally positioned, and even when they are screwed, they are not affected by the rotation of the screw, and exhibit excellent effects such as variations due to operators and variations due to lots.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another embodiment of the above.

FIG. 3 is an exploded perspective view showing still another embodiment of the same.

FIG. 4 is an exploded perspective view showing the same or another embodiment.

FIG. 5 is a cross-sectional view showing the same or yet another embodiment.

FIG. 6 is an exploded perspective view showing the same or another embodiment.

FIG. 7 is a cross-sectional view showing the same or another embodiment.

FIG. 8 is a perspective view of a wiring board used in still another embodiment of the same.

FIG. 9 is a sectional view showing a conventional example.

FIG. 10 is an explanatory view showing the positioning of the conventional example.

FIG. 11 is a front view showing the conventional example.

FIG. 12 is a front view showing another conventional example.

FIG. 13 is an exploded perspective view showing still another conventional example.

FIG. 14 is a sectional view showing still another conventional example.

FIG. 15 is a sectional view showing still another conventional example.

[Explanation of symbols]

 18 Front case 19 Rear case 20 Counterbore hole 21 Free hole 22 Boss 23 Step 24 Protrusion 25 Boss 26 Recess 27 Screw hole 28 Hole 29 Bos 30 Recess 31 Bos 32 Projection 33 Positioning hole 34 Boss 35 Pin 36 hole

Claims (4)

[Claims] 1. A front projection, which is formed on either one of the front case and the rear case,
A housing structure of an electronic device, wherein a recess or a hole capable of fitting with the projecting portion is formed in the other one of the rear cases and the wiring board. 2. A boss is formed in each of the front case and the rear case, a play hole is formed in one of the bosses of the front case and the rear case, a protrusion is formed in one of the bosses, and a recess is formed in the other. The housing structure for an electronic device according to claim 1, wherein the housing is formed, and a step is provided on the protrusion, and the wiring board can be fitted to the step. 3. A hole is formed in one of the front case and the rear case, and a boss is formed in the other of the front case and the rear case. The boss is a wiring board, the front case, and the rear case. The housing structure for an electronic device according to claim 1, further comprising a shaft protruding through any one of the shafts, wherein a protruding portion of the shaft is thermally caulked. 4. A boss is formed on one of the front case and the rear case, a protrusion is formed on the boss, and a fixing hole eccentric from the protrusion is formed on the other of the front case and the rear case. 2. The housing structure for an electronic device according to claim 1, wherein a hole for fixing the protrusion and a fixing hole are formed on the wiring board, and the protrusion and the hole can be fitted.