JP3394145B2 - Connection structure between boards - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a board-to-board connecting structure for electrically connecting a conductive layer of a front substrate disposed inside a case and a conductive layer of a rear substrate laid outside the bottom of the case. Regarding

[0002]

2. Description of the Related Art A conventional board-to-board connecting structure has a conductive layer 1 of a front board 4 disposed inside a case 1 as shown in FIG.
4 and the conductive layer 18 of the rear substrate 6 laid outside the bottom portion 5 of the case 1 are electrically connected by a lead wire 40, or provided inside the case 1 as shown in FIG. The conductive layer 14 of the front side substrate 4 and the conductive layer 18 of the rear side substrate 6 laid outside the bottom 5 of the case 1 are connected to each other by the conductive metal fitting 45.
There is a terminal method to connect electrically.

[0003]

However, in the lead wire system of FIG. 5, the tube covering the lead wire 40, the terminals 41 and 42 at both ends of the lead wire 40, and the connecting portion of the lead wire 40 and the terminals 41 and 42. The number of parts such as 43 and 44 is large, and the wiring process at the time of assembly becomes complicated.

The terminal system of FIG. 6 has a smaller number of parts than the lead wire system, but the conductive metal fitting 45 is required to have a plate thickness necessary for forming a burring portion for screwing the screw 47 at the end thereof. As a result, the cost of parts is increased, and it is unavoidable that the mounting workability is deteriorated because the end of the conductive metal fitting 45 that is fastened and fixed by the screw 47 must be positioned inside the case 1.

Therefore, the present invention reduces the number of parts,
It is intended to provide a board-to-board connection structure capable of improving mounting workability.

[0006]

According to a first aspect of the present invention, there is provided a front substrate having a conductive layer provided in a front opening of an accommodating portion formed of a case, and a conductive layer is provided on an outer surface of a bottom portion of the case. Laying a rear side substrate provided with a layer, fastening conductive metal fittings with screws across the conductive layer of the front side substrate and the conductive layer of the rear side substrate, and electrically connecting both conductive layers. In the board-to-board connection structure, through holes are formed at both ends of the conductive metal fitting,
One end thereof is bent and formed in advance, and is superposed on the conductive layer of the front substrate from the front side and fastened to the front substrate by a screw through a through hole, and the other end of the conductive metal fitting is placed on the bottom of the case from the accommodation portion side. It is characterized in that it is projected to the outside of the bottom through the formed slit, the other end of the projected is bent, is superimposed on the conductive layer of the rear substrate, and is fastened to the rear substrate by a screw through the through hole. .

According to the first aspect of the present invention, one end portion of the conductive metal fitting, which has been bent in advance, is fastened to the conductive metal fitting on the front substrate side, which is arranged on the front side of the accommodating portion, with a screw, and By projecting the other end of the housing from the accommodating portion to the outside through the slit in the bottom of the case, bending the other end, and fastening it to the conductive layer on the rear substrate side outside the case bottom with a screw,
Mounting workability can be improved by reducing the number of parts.

According to a second aspect of the present invention, the conductive metal fitting according to the first aspect is characterized in that the end portion is formed to have a thickness such that the end portion can be freely bent.

According to the structure of claim 2, the end portion of the conductive metal fitting can be easily bent along the front substrate or the rear substrate.

According to a third aspect of the present invention, the electrically conductive metal fittings according to the first and second aspects are provided with an easily bendable portion in the vicinity of the other end portion at a position corresponding to the slit. .

According to the third aspect of the invention, the other end of the conductive metal fitting projecting from the slit to the outside of the case can be easily and accurately bent at the easily bendable portion.

According to a fourth aspect of the present invention, stoppers are provided on both side edges near the other end of the conductive metal fitting according to the first to third aspects so as to engage with the edge portion of the slit on the accommodation portion side. It is characterized by having done.

According to the structure of claim 4, the load when the other end of the conductive metal fitting is bent by the engagement of the stopper with the edge portion of the slit on the accommodation portion side, the one end of the conductive metal fitting is bent. It is possible to avoid acting on the fastening portion between the front substrate and the front substrate.

A fifth aspect of the present invention is characterized in that a positioning portion that engages with each other is provided at one end of the conductive metal fitting according to the first to fourth aspects and the conductive layer of the front substrate.

According to the structure of the fifth aspect, the positioning portion of the front substrate and the positioning portion of the conductive metal fitting are engaged with each other.
One end of the conductive metal fitting can be accurately overlapped with the conductive layer of the front substrate.

According to a sixth aspect of the present invention, the front substrate according to the first to fifth aspects is provided with a positioning convex portion with which a side edge of one end of the conductive metal fitting that is superposed on the conductive layer engages. It has a feature.

According to the structure of the present invention, the side edge of one end of the conductive metal fitting engages with the positioning protrusion of the front substrate, so that the one end of the conductive metal fitting is accurately aligned with the conductive layer of the front substrate. Can be overlaid on.

According to a seventh aspect of the present invention, the slits according to the first to sixth aspects have slanted surfaces for inserting and guiding the other end of the conductive metal fitting at the edges of the long sides facing each other on the accommodating portion side. It is characterized in that it has a guide protrusion.

According to the structure of claim 7, when the other end of the conductive fitting is inserted into the slit, the slant face of the guide projection provides an insertion guide action, so that the insertion work can be easily performed.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

FIGS. 1 to 4 show an embodiment of the present invention. In these drawings, reference numeral 1 is a case of a meter, for example, which has an accommodating portion 2 having an open front portion, and the front portion of the accommodating portion 2 is shown. The front substrate 4 on which the dial 3 is overlapped is arranged, and the rear substrate 6 is laid on the outer surface of the bottom portion 5. The bottom portion 5 is provided close to the end portion of the rear substrate 6 and the housing portion 2 and the outside. A slit 7 is formed so as to penetrate therethrough.

In the case of this embodiment, guide projections 8 having slopes are formed on the edges of the long sides of the slits 7 on the accommodation portion 2 side that face each other.

The front substrate 4 has a mounting hole 11 for fastening a screw 10 such as a tapping screw in a part of a side edge portion thereof,
Positioning portion 12 projecting upward around the mounting hole 11
Is provided with a convex portion and a positioning convex portion 13.

The dial 3 is provided with a conductive layer 14 printed on its front surface to shield harmful electromagnetic waves emitted to the front side by an internal unit driving circuit (not shown) for driving a pointer. The mounting hole 11 of the front substrate 4 is provided at a part of the side edge of the board 3.
Corresponding to the projection 12 and the positioning projection 13 of the front substrate 4 around the through hole 15, and the projection 12 and the positioning projection 13 are inserted from below. A plurality of through-holes 16 and 17 are provided.

A conductive layer 18 is provided on the rear surface of the rear substrate 6, and a mounting hole 20 for inserting a screw 19 such as a tapping screw is formed at the end of the rear substrate 6.

Reference numeral 21 is a conductive metal fitting for connecting the conductive layer 14 on the front substrate 4 side and the conductive layer 18 on the rear substrate 6 side, which is a conductive metal plate such as thin brass so that it can be freely bent. It is formed in a plate shape, and through holes 24, 25 are formed in both end portions 22, 23 thereof. One end 22 is pre-bent at approximately 90 degrees, and the through hole 2 of this one end 22 is formed.
The portion where 4 is formed is formed as a wide portion 26, and a positioning hole 27 as a positioning portion into which the convex portion 12 of the front substrate 4 is inserted and engaged is formed on one side portion of the wide portion 26. On the other side of the wide portion 26, a locking edge 28 that engages with the positioning protrusion 13 of the front substrate 4 is formed.

The other end 23 of the conductive metal fitting 21 is projected from the inside of the accommodating portion 2 to the outside of the bottom 5 through the slit 7, and an opening 29 is formed in the vicinity of the other end 23 at a position corresponding to the slit 7. The easily bendable portion 30 is provided and the stoppers 31 projecting outward are formed at both side edges of the base of the easily bendable portion 30.
When the other end 23 is projected on the outside of the bottom 5 through the slit 7 by overlapping the front face of the dial 3 with the stopper 3,
1 is engaged with the edge of the slit 7 on the accommodation portion 2 side.

Reference numeral 32 in FIG. 1 denotes a facing plate attached to the front portion of the case 1, and 33 denotes a light-transmitting front cover.

According to the structure of the above embodiment, when the conductive layer 14 of the front substrate 4 and the conductive layer 18 of the rear substrate 6 are electrically connected by the conductive metal fitting 21, the conductive metal fitting 21 is first connected.
The other end portion 23 is inserted into the slit 7 of the bottom portion 5 of the case 1 from the housing portion 2 side so as to project to the outside of the bottom portion 5.

At this time, since the long side of the slit 7 is provided with the guide protrusions 8 having inclined surfaces on the opposite edges on the side of the housing portion 2, the tip of the other end portion 23 has these guide protrusions 8.
It can be easily inserted into the slit 7 by being guided by the sloped surface.

Then, the positioning hole 27 of the one end portion 22 of the conductive metal fitting 21 is fitted into the convex portion 12 of the front substrate 4 projecting forward from the one through hole 16 of the dial 3, and
The engaging edge 28 of the wide portion 26 is connected to the other through hole 1 of the dial 3.
Positioning projections 1 of the front substrate 4 projecting forward from 7
3 to position the one end portion 22 of the conductive metal fitting 21 on the front surface of the conductive layer 14 on the front substrate 4 side.

Thereafter, the screw 10 is screwed into the mounting hole 11 of the front substrate 4 through the through hole 24 of the one end 22 and the through hole 15 of the dial 3, and the one end 22 of the conductive metal fitting 21 is attached to the front side. It is fixed to the substrate 4.

Next, the other end portion 23 of the conductive metal fitting 21 protruding from the slit 7 to the outside of the bottom portion 5 is bent toward the rear substrate 6 side from the easily bendable portion 30, and the through hole 25 of the other end portion 23 is formed. After aligning with the rear substrate 6 and the mounting holes 20 of the bottom portion 5,
The screw 19 is inserted through the through hole 25 and screwed and fastened to the rear substrate 6 and the mounting hole 20 of the bottom portion 5, so that the conductive layer 14 on the front substrate 4 side and the conductive layer 18 on the rear substrate 6 side are electrically conductive. It can be easily electrically connected by the metal fitting 21.

Here, since the stopper 31 of the conductive metal fitting 21 is engaged with the edge of the slit 5 of the bottom portion 5 on the accommodation portion 2 side, the conductive metal fitting 21 protruding to the outside of the case 1 as described above. When the other end portion 23 of the
It is possible to prevent a load from being applied to the fastening portion between the one end portion 22 and the front substrate 4, and the one end portion 22 and the conductive layer 14 can be prevented.
The connection stability with can be secured.

Further, the other end portion 23 of the conductive metal fitting 21 projecting outward from the slit 7 can be bent more easily and accurately than the easily bendable portion 30 formed at a position corresponding to the slit 7, so that it penetrates. The matching between the holes 25 and the mounting holes 20 is also good.

[0036]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, one end portion of the conductive metal fitting, which has been bent in advance, is superposed on the conductive layer on the front substrate side and fastened with a screw, and the conductive material is projected outward from the slit at the bottom of the case. Since the other end of the metal fitting can be bent and overlapped with the conductive layer on the rear substrate side outside the case bottom and fastened with screws, workability can be improved and the number of parts can be reduced. It can greatly contribute to cost reduction.

According to the second aspect of the present invention, since the conductive metal fitting is formed to have a thickness such that the end portion can be freely bent, when the one end portion of the conductive metal fitting is bent in advance, the other end portion is of course bent. Even when it is bent after being projected from the slit to the outside, it can be easily bent, and the assembling workability can be improved.

According to the third aspect, since the easily bendable portion is formed in the vicinity of the other end of the conductive metal fitting at a position corresponding to the slit, after the other end is projected outward from the slit. ,
When bent to the rear substrate side, it can be bent more easily and accurately than the easily bent portion, and the alignment work between the other end portion and the rear substrate can be facilitated.

According to the fourth aspect of the present invention, since the stoppers formed on both side edges near the other end of the conductive metal fitting engage with the edge of the slit at the bottom of the case, the conductive metal fitting and the front substrate are connected. It is possible to avoid applying a load to the fastening part,
It is possible to secure the connection stability between the one end and the conductive layer.

According to the fifth aspect of the present invention, the one end of the conductive metal fitting and the conductive layer of the front substrate are provided with the positioning portions that engage with each other. Can be accurately overlapped with each other and the connection work can be further improved.

According to the sixth aspect, the side edge of the one end of the conductive metal fitting engages with the positioning projection of the front substrate,
One end of the conductive metal fitting can be accurately overlapped with the conductive layer of the front substrate, and the connection work can be further improved.

According to the seventh aspect of the present invention, since the long side of the slit is provided with the guide protrusion having the inclined surface for inserting and guiding the other end of the conductive metal fitting, the other edge of the slit on the side of the accommodating portion facing each other is provided. It is possible to easily insert the end into the slit.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing an outer surface of a case bottom portion of the same embodiment.

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

FIG. 4 is a cross-sectional view in which the easily bendable portion of the same embodiment is inserted into a slit.

FIG. 5 is a cross-sectional view showing a conventional lead wire type inter-substrate connection structure.

FIG. 6 is a sectional view showing a conventional terminal-type board-to-board connection structure.

[Explanation of symbols]

1 case 2 accommodation 4 Front board 5 bottom 6 Rear substrate 7 slits 10, 19 screws 12 Positioning part 13 Positioning projection 14, 18 Conductive layer 21 Conductive metal fittings 22 One end 23 The other end 24,25 through holes 27 Positioning hole (positioning part) 28 Locking edge 31 Stopper

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01R 9/09

Claims (7)

(57) [Claims] 1. A front substrate provided with a conductive layer is arranged in a front opening of a housing formed by a case, and a rear substrate provided with a conductive layer is laid on an outer surface of the bottom of the case. In a board-to-board connection structure in which conductive metal fittings are fastened with screws across the conductive layer of the front board and the conductive layer of the rear board, both end portions of the conductive metal fittings are electrically connected to each other. A through hole is formed in one side, one end portion of which is bent in advance, is superposed on the conductive layer of the front side substrate from the front side, and is fastened to the front side substrate with a screw through the through hole, and the other end portion of the conductive metal fitting is accommodated. From the side to the outside of the bottom through a slit formed in the bottom of the case, bend the other end of the protrusion and overlap with the conductive layer of the rear substrate, and through the through hole to the rear substrate by screws. A board-to-board connection structure characterized by being fastened. 2. The board-to-board connecting structure according to claim 1, wherein the conductive metal member is formed to have a thickness such that an end portion thereof can be freely bent. 3. The inter-board connection structure according to claim 1, wherein an easily bendable portion is provided at a position corresponding to the slit near the other end of the conductive metal fitting. 4. The stopper according to claim 1, which is provided at both side edges near the other end of the conductive metal fitting so as to engage with an edge portion of the slit on the accommodation portion side. The board-to-board connection structure described in. 5. The inter-board connection structure according to claim 1, wherein a positioning portion that engages with each other is provided on one end portion of the conductive metal fitting and the conductive layer of the front substrate. . 6. The front side substrate is provided with a positioning convex portion with which a side edge of one end portion of a conductive metal fitting which is superposed on the conductive layer is engaged. Board-to-board connection structure. 7. The slit is provided with guide projections having slanted faces for inserting and guiding the other end of the conductive metal fitting, at opposite edges of the long side of the slit on the accommodating portion side. The inter-substrate connection structure according to any one of 1 to 6.