JP3231237B2 - Electrical connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrical connection structure for electrically connecting two conductive members, and more particularly to an electrical connection structure suitable for a shield case for shielding an electronic circuit board.

[0002]

2. Description of the Related Art In general, an electronic circuit board having an oscillation circuit or the like is used to reduce unnecessary radiation to the outside. To prevent the effects of noise, etc.
It is mounted in a shield case made of a conductive metal and is electrically grounded.

FIG. 7 shows a metal case 1 and a cover 4 which constitute this kind of shield case. The metal case 1 is formed in a rectangular parallelepiped shape having an open upper surface, and the cover 4 covers the upper surface of the metal case 1. Have been. A printed circuit board (PCB) 2 to be shielded is mounted in the metal case 1, and a longitudinal projection 13 for locking the cover 4 is provided on the outer periphery of the upper side wall of the metal case 1 in the horizontal direction. The cover 4 is formed so as to protrude therefrom.
1 is formed.

FIG. 8 shows a conventional electrical connection structure for electrically connecting a metal case 1 of a shield case and its cover 4 as two conductive members. Metal case 1
(Or a shield plate provided in the metal case 1)
A twist 4a is formed on the cover 4 so that the twist 1a can be inserted manually or by a tool.
a is formed. In such a configuration, the twist portion 1
By inserting and twisting a into the slit 4a, the metal case 1 and the cover 4 can be electrically connected.

FIG. 9 shows another conventional shield case. For example, a pair of tongue pieces 4b are formed on the cover 4, and the claws 41 of the cover 4 shown in FIG. The metal case 1 and the cover 4 are electrically connected to each other by bringing the tongue piece 4b into contact with the metal case 1 in a state in which the metal case 1 is in contact with the metal case 1.

[0006]

However, in the conventional example shown in FIG. 8, there is a problem that the work of twisting the twist portion 1a is required, and the workability is poor. Further, in the conventional example shown in FIG. 9, since the tongue piece 4b is simply brought into contact with the metal case 1, if the tongue piece 4b is formed of a rigid material in order to increase the contact pressure, the contact becomes unstable due to metal fatigue. There is a problem that becomes.

The present invention has been made in view of the above-mentioned conventional problems, and provides an electric connection structure that can improve workability in electrically connecting a metal case and a cover and that can stably connect. The purpose is to provide.

[0008]

The present invention SUMMARY OF] In order to achieve the above object, a cover closing the opening of the metal case and a metal case, a first projecting portion Toko to said metal casing
And a second protrusion having a smaller protrusion amount than the first protrusion of
Forming a protrusion for inserting the protrusion into the cover, forming a contact piece protruding inward in the horizontal direction from a side surface of the protrusion, and forming the protrusion into the slit. upon insertion into the
The first protrusion is used as a guide for insertion, and the contact piece is
The metal case and the cover are electrically connected by being bent at a side surface of the second protrusion.

In addition to the above structure, wherein the contact piece consists of two contact pieces so as to be opposed to each other with respect to the horizontal direction inward from the side surface of the protrusion.

[0010] Further, the two contact pieces are formed at positions deviated along the slit direction.

The slit is formed in a substantially S-shape.

[0012]

Further, the first and second projections are inserted into the same slit of the cover.

Further, the first and second protrusions are inserted into another slit of the cover.

Further, the slit is formed in a concave portion of the cover.

According to the present invention, the first and second projections having different projection amounts are provided.
When the protrusion having the second protrusion and the second protrusion is inserted into the slit, the first protrusion having the larger protrusion amount is used as a guide at the time of insertion.
Then, the contact piece is bent at the side of the second projecting portion having a small projecting amount , so that the metal case and the cover closing the opening of the metal case are electrically connected. Both can be electrically connected, so that workability can be improved and electrically stable connection can be achieved.

[0017]

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

FIG. 1 is a plan view showing an electrical connection structure according to a first embodiment of the present invention, and FIG. 2 is a right side view showing the structure of FIG. 1 and 2 show a case where the present invention is applied to the metal case 1 and the cover 4 of the shield case shown in FIG.
FIG. 1 shows a state where the metal case 1 and the cover 4 have not yet been engaged and the contact pieces 43a and 43b have not been bent. FIG. 2 shows a state where the metal case 1 and the cover 4 have been engaged and the contact pieces 43a and 43b have not been bent. Indicates a bent state.

1 and 2, a metal case 1 has a U-shaped projection 11 formed in a side view.
Reference numeral 1 denotes end portions 11a and 11b having both ends protruding, and end portions 11a and 11b.
a, 11b, which is lower than the central portion 11c. Ends 11a and 11b are first protrusions having a large protrusion amount.
Thus, the central portion 11c has a larger protrusion amount than the end portions 11a and 11b.
Small second projections, these ends 11a, 11b
The central portion 11c is formed linearly in the YY direction in FIG. 1 on a horizontal plane. On the other hand, the cover 41 has a recess 41 so as to bulge in the direction of the metal case 1 for reinforcement.
Is formed in the recess 41, and a slit 42 into which the protrusion 11 of the metal case 1 can be inserted is formed. In the slit 42, portions corresponding to the ends 11a and 11b of the protrusion 11 are formed linearly, and a portion corresponding to the center 11c is formed substantially in an S shape. Further, as shown by hatching in FIG.
1c so as to protrude inward from the side surface and the center line XX
A pair of contact pieces 43a and 43b are formed at positions deviated from.

When such a configuration is applied to the shield case shown in FIG. 7 and the claw 41 of the cover 4 is engaged with the protrusion 13 of the metal case 1 and the protrusion 11 is inserted into the slit 42, first, Ends 11a, 11b of protrusion 11
When the projection 11 is inserted into the slit 42, the contact pieces 43a and 43b are brought into contact with the central portion 11 of the projection 11 as shown in FIG.
The contact pieces 43a, 43b and the central portion 11c are engaged and electrically connected to each other.

Therefore, the metal case 1 and the cover 4 can be electrically connected only by moving the slit 42 and the projection 11 in the vertical direction.
In addition, it is possible to electrically stably connect. Also,
End 1 of protrusion 11 not in contact with contact pieces 43a, 43b
Since 1a and 11b serve as guides at the time of insertion, the insertion work is also simplified.

The second embodiment shown in FIG. 3 is a modification of the first embodiment, and the projection 11 on the metal case 1 side has the same configuration. In the second embodiment, the slit 42a on the cover 4 side is formed linearly so as to correspond to the projection 11. Also in the second embodiment, similarly to the first embodiment, a pair of contact pieces 43a and 43b are formed in the slit 42a so as to protrude inward from the central portion 11c and to sandwich the center line. Therefore, the contact pieces 43a and 43b are
The contact pieces 43a and 43b are engaged with the central portion 11c to be electrically connected.

The third embodiment shown in FIG. 4 shows a modification of the second embodiment. FIG. 4 (a) is a plan view and FIG. 4 (b) is a right side view. The protrusions 11 on the metal case 1 side have the same configuration. In the third embodiment, the slits 42a on the cover 4 side are formed linearly so as to correspond to the protrusions 11, but the slits 42a Is formed with one contact piece 43, and this one contact piece 43 and the central portion 11c are engaged to be electrically connected.

Next, a fourth embodiment will be described with reference to FIG. FIG. 5A is a plan view, and FIG. 5B is a right side view. The protrusion on the metal case 1 side is formed in a substantially E-shape in a side view, and has three protrusions 12, 13, and 14 which are parallel to each other. The horizontal sections of the protrusions 12 and 13 on both sides are correct.
The projections 12 and 13 are formed in a square shape,
The first protrusion has a larger protrusion amount than the portion 14. Also,
Central protrusion 14 is formed in a longitudinal shape, the protrusion 14
Is a second protrusion having a smaller protrusion amount than the protrusions 12 and 13
It is . On the other hand, the protrusions 1 on both sides are provided on the cover 4 side.
Square holes 44 and 45 corresponding to 2 and 13 are formed, and a linear slit 46 corresponding to the central elongated protrusion 14 is formed. Also, this slit 46
Is formed with a pair of contact pieces 43a and 43b. In this embodiment, the projections 12 and 13 on both sides serve as guides for insertion, and the projection 14 at the center bends the contact pieces 43a and 43b.

The fifth embodiment shown in FIG. 6 shows a modification of the fourth embodiment. FIG. 6 (a) is a plan view, FIG. 6 (b) is a right side view, and FIG. 6 (c) is a front view. FIG. That is, the protrusions on the metal case 1 side are three protrusions 12a, 13a, and 14a.
First protrusion are configured, the central protruding portion 14a is formed higher than the both sides of the protruding portions 12a, 13a by
And the horizontal cross section is formed as a square, and the protrusions 12a and 13a on both sides are more protruding than the protrusions 12a and 13a.
Are small second protrusions and are formed in a longitudinal shape. Correspondingly, the projections 1 on both sides are provided on the cover 4 side.
Slits 44a, 45 corresponding to 2a, 13a, respectively
a and a square hole 46a corresponding to the central projection 14a.
Are formed, and the contact pieces 43a and 43b are formed in the slits 44a and 45a, respectively. In this embodiment, the central projection 14a serves as a guide for insertion, and the projections 12a and 13a on both sides bend the contact pieces 43a and 43b.

[0026]

As described above, according to the present invention,
A protrusion having first and second protrusions having different protrusion amounts
The first protrusion with a large protrusion amount when inserting into the slit
Part is used as a guide for insertion, and the contact piece is
Since the metal case and the cover are electrically connected by being bent at the side surface of the projecting portion , the two can be electrically connected only by covering the metal case with the cover, thus improving workability. And electrically stable connection can be achieved.

[Brief description of the drawings]

FIG. 1 is a plan view showing an electrical connection structure according to a first embodiment of the present invention.

FIG. 2 is a right side view showing the structure of FIG.

FIG. 3 is a perspective view showing an electrical connection structure according to a second embodiment.

FIG. 4 is an explanatory diagram illustrating an electrical connection structure according to a third embodiment.

FIG. 5 is an explanatory diagram showing an electrical connection structure according to a fourth embodiment.

FIG. 6 is an explanatory diagram showing an electrical connection structure according to a fifth embodiment.

FIG. 7 is a perspective view showing a shield case to which the electrical connection structure of the present invention is applied.

FIG. 8 is a diagram showing a conventional electrical connection structure.

FIG. 9 is a diagram showing another conventional electrical connection structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Metal case 4 Cover 11 Projection part (projection part) 11a, 11b End part (first projection part) 11c Central part (second projection part) 12, 13 Projection part (first projection part) 12a, 13a Projection Portion (Second Projection) 14 Projection (Second Projection) 14a Projection (First Projection) 41 Depression 42, 42a, 44 to 46, 44a to 46a Slit 43, 43a, 43b Contact Piece

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H05K 9/00

Claims (7)

(57) [Claims] 1. A metal case and a cover for closing an opening of the metal case, wherein the metal case has a first protrusion and
A second protrusion having a smaller protrusion amount than the first protrusion;
Forming a protruding portion having a protrusion, forming a slit for inserting the protruding portion into the cover, and forming a contact piece protruding inward in a horizontal direction from a side surface of the protruding portion in the slit, and when inserted into the slit, before
The first projection is used as a guide at the time of insertion, and the contact piece is bent at a side surface of the second projection to electrically connect the metal case and the cover. Connection structure. 2. The electrical connection according to claim 1, wherein the contact piece comprises two contact pieces so as to be opposed to each other inward in the horizontal direction from the side surface of the protrusion. Construction. 3. The electrical connection structure according to claim 2, wherein said two contact pieces are formed at positions deviated along said slit direction. 4. The electrical connection structure according to claim 1, wherein said slit is formed in a substantially S-shape. 5. The cover according to claim 1, wherein the first and second protrusions are provided on the cover.
2. The device according to claim 1, wherein the plurality of slits are inserted into the same slit.
The electrical connection structure as described. 6. The cover according to claim 1, wherein the first and second protrusions are provided on the cover.
The electrical connection structure according to claim 1 , wherein the electrical connection structure is inserted into another slit . 7. The slit is formed in a recess of the cover.
The electrical connection structure according to claim 1 , wherein the electrical connection structure is formed.