JPH11273810A - Electrical connection structure for instrument wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an electrical connection between a flexible wiring board and a hard wiring board, without increasing the sizes of a connecting connector and a hard wiring board and their cost, despite instruments being multifunctional. SOLUTION: A flexible wiring board 3 and a hard wiring board 4 to be mounted on a meter case 2 are electrically connected through a pattern connecting part 5 to make a connection by a surface touch between connecting ends of a circuit pattern and a connecting part 7 to make a connection by a connecting connector 6 between both wiring boards 3, 4. An increased connecting part between both wiring boards 3, 4 can be formed by the pattern connecting part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connection structure of an instrument wiring board for electrically connecting a flexible wiring board and a hard wiring board mounted on a meter case of a combination meter, for example.

[0002]

2. Description of the Related Art A combination meter incorporates a plurality of instruments such as a speedometer, a tachometer, a fuel gauge, and a water temperature gauge. An electric circuit for driving the plurality of meters includes a flexible wiring board and a hard wiring board mounted on a meter case.

At this time, control electronic components which usually require soldering are mounted on a hard wiring board, other light source circuits and the like are formed on a flexible wiring board, and the hard wiring board and the flexible wiring board are interposed. And are electrically connected by a connector. The connector includes a plurality of pin terminals, one end of which is fixed to the hard wiring board by soldering and the other end of which is in elastic contact with the connection end of the circuit pattern of the flexible wiring board.

[0004]

However, in such a conventional electrical connection structure of a wiring board for an instrument,
There is a problem that an increase in the number of pin terminals accompanying the multifunctionalization of the combination meter leads to an increase in the size of the connector and the hard wiring board, which in turn leads to an increase in cost.

Accordingly, the present invention enables the electrical connection between the flexible wiring board and the hard wiring board without increasing the size of the connecting connector and the hard wiring board and increasing the cost, despite the multifunctionality of the instrument. It is an object of the present invention to provide an electrical connection structure for an instrument wiring board.

[0006]

According to a first aspect of the present invention, a flexible wiring board and a hard wiring board, which are mounted on a meter case, are arranged so that the connection ends of the circuit patterns are connected to each other. A pattern connection part connected by
It is characterized by being electrically connected to a connector connecting portion connected by a connecting connector interposed between the two wiring boards.

Therefore, according to the first aspect of the present invention, the increased connection between the two wiring boards can be constituted by the pattern connection part, so that the enlargement of the connection connector and the hard wiring board can be suppressed as much as possible. .

According to a second aspect of the present invention, there is provided the electrical connection structure for an instrument wiring board according to the first aspect, wherein the pattern connecting portion is provided between the cover covering the hard wiring board and the meter case. The flexible wiring board and the hard wiring board are held by fixing the flexible wiring board and the hard wiring board in a sandwich structure with screws for fixing the cover.

According to the second aspect of the present invention, the fixing and holding of the pattern connecting portion are performed by using the cover for covering the hard wiring board and the screws for fixing the meter case and the cover. It can be performed without increasing man-hours.

The invention of claim 3 is the first or second invention.
In the electrical connection structure of the instrument wiring board according to the, the portion corresponding to the pattern connection portion of the meter case,
It is characterized in that it is formed so as to be substantially the same height as the connection connector.

According to the third aspect of the present invention, the hard wiring board can be held substantially parallel to the general portion of the meter case, so that both the connection portions of the pattern connection portion and the connector connection portion can be stably held. Can be.

According to a fourth aspect of the present invention, there is provided an electrical connection structure for an instrument wiring board according to any one of the first to third aspects, wherein a connection end of the hard wiring board of the pattern connection portion is provided. Are formed around a fixing screw hole formed in the hard wiring board.

According to the fourth aspect of the present invention, since the connection end for connecting the pattern of the hard wiring board is formed around the screw hole for fixing the hard wiring board which is originally a dead space, the connection end is formed. The connection end can be formed without increasing the size of the hard wiring board.

[0014]

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

FIG. 1 shows an electrical connection structure 1 of an instrument wiring board as an embodiment of the present invention applied to a combination meter 50. The combination meter 50
As shown in FIGS. 4 and 5, a speedometer 51, a tachometer 52, a fuel gauge 53, a water temperature gauge 54, an odometer 55,
A plurality of instruments such as the indicator unit 56 are incorporated in the meter case 2. An electric circuit for driving the plurality of meters is composed of a flexible wiring board 3 and a hard wiring board 4 mounted on the back surface of the meter case 2. The electrical connection structure 1 of the instrument wiring board is formed on the back surface of the meter case 2 using these two wiring boards 3 and 4.

That is, the electrical connection structure 1 of the instrument wiring board
Is a flexible wiring board 3 mounted on the meter case 2
And the hard wiring board 4 are connected by a pattern connecting part 5 connected by surface touch between the connection ends of the circuit pattern, and a connector connecting part 7 connected by a connecting connector 6 interposed between the wiring boards 3 and 4. It is electrically connected and configured roughly.

The flexible wiring board 3 includes the meter case 2
The meter case 2 has a pattern surface 3a formed by printing a circuit pattern (not shown) such as an electric circuit for electrically connecting the light source bulb 57 to the bottom surface of the meter case 2. Is attached to the bottom rear surface of the.

As shown in FIG. 2, the hard wiring board 4 is provided with control electronic components such as a central processing unit (CPU) 8 and a power supply integrated circuit 9 on a pattern surface 4a on which a circuit pattern (not shown) is formed by printing. And connector 10 for odometer 55
And a connection connector 6 are attached by soldering. The connection connector 6 includes a case frame 12 and
Are provided with a plurality of pin terminals 11, 11,... Attached to the case frame 12 with the upper end 11a and the lower end 11b protruding upward and downward, respectively.
Are attached to the hard wiring board 4 by soldering 13 (see FIGS. 1 and 2).

The hard wiring board 4 is incorporated in a cover 15 together with a heat sink 14 made of a single stainless steel plate member to constitute a sub-assembly 16, and the sub-assembly 16 is attached to the bottom rear surface of the meter case 2. It is mounted on the meter case 2 by positioning it on the attached flexible wiring board 3 and fixing it with a screw 17.

By attaching the hard wiring board 4, the lower ends 11b of the plurality of pin terminals 11, 11,... Resiliently contact the respective connection ends of the circuit pattern of the flexible wiring board 3 to form the connector connection portion 7. The connection ends of the circuit patterns of the flexible wiring board 3 and the hard wiring board 4 are connected by surface touch (see FIGS. 1 and 3) to form a pattern connection portion 5 (see FIG. 1). Thereby, the electrical connection structure 1 of the present embodiment can be configured.

According to this configuration, even if the number of connecting portions between the flexible wiring board 3 and the hard wiring board 4 increases with the increase in the number of functions of the combination meter 50, the increased number of connecting portions can be constituted by the pattern connecting portions 5. Since the connection connector 6 and the hard wiring board 4 can be minimized in size, the cost can be reduced.

The pattern connecting portion 5 in the present embodiment
Is held between the cover 15 covering the hard wiring board 4 and the meter case 2 by fixing the flexible wiring board 3 and the hard wiring board 4 in a sandwich structure with screws 17 for fixing the cover 15. For this reason, the holding of the pattern connecting portion 5 can be performed without increasing the number of components and the number of assembling steps since other members as holding means are not required.

The electric connection structure 1 preferably has the structure shown in FIG.
As shown in (1), a portion corresponding to the pattern connection portion 5 of the meter case 2 is formed so as to protrude so as to be substantially the same height as the connector 6 for connection. That is, at the portion corresponding to the pattern connection portion 5 of the meter case 2, a projection 19 is formed so as to protrude so as to be substantially the same height as the case frame 12 of the connection connector 6. It is cut out like a tongue and bent along the projection 19, and its end is press-fitted into a projection 20 formed on the step of the projection 19 and set. Thus, the pattern connecting portion 5 is held between the cover 15 and the convex portion 19 by fixing the flexible wiring board 3 and the hard wiring board 4 in a sandwich structure with the screws 17 for fixing the cover 15.

According to this configuration, the hard wiring board 4 can be held substantially parallel to the general part of the meter case 2, so that the pattern connection part 5 and the connector connection part 7 can be stably held, As a result, the electrical connection between the wiring boards 3 and 4 can be stabilized.

Further, the electrical connection structure 1 is more preferably such that the connection ends 18, 18,... Of the hard wiring board 4 of the pattern connection portion 5 are fixed to the hard wiring board 4 as shown in FIG. At the peripheral portion 4c of the screw hole 4b.

According to this configuration, the connection end 1 for the pattern connection 5 of the hard wiring board 4 is provided at the peripheral portion 4c of the screw hole 4b for fixing the hard wiring board 4 which is originally a dead space.
.. Are formed, the connection ends 18, 18,.
Can be formed without increasing the size of the hard wiring board 4.

[0027]

As described above, according to the first aspect of the present invention, even if the number of connecting portions between the flexible wiring board and the hard wiring board increases with the increase in the number of functions of the gauge, the increased connecting portions are formed in a pattern. Since the connection portion can be used, the size of the connection connector and the rigid wiring board can be reduced as much as possible, and the cost can be reduced.

According to the second aspect of the present invention, the pattern connection portion has a sandwich structure between the flexible wiring board and the hard wiring board by a screw fixing the cover between the cover covering the hard wiring board and the meter case. Since it is held by fixing, it eliminates the need for other members as holding means,
This makes it possible to easily assemble without increasing the number of parts and the number of assembling steps.

According to the third aspect of the present invention, the hard wiring board can be held substantially parallel to the general portion of the meter case, so that the pattern connection portion and the connector connection portion can be stably held, This makes it possible to stabilize the electrical connection between the flexible wiring board and the hard wiring board.

According to the fourth aspect of the present invention, the connection end for connecting the pattern of the hard wiring board is formed around the screw hole for fixing the hard wiring board which is originally a dead space. The connection end can be formed without increasing the size of the hard wiring board, and thus the cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an electrical connection structure of an instrument wiring board as one embodiment of the present invention.

FIG. 2 is a rear view of a sub-assembly used for the electrical connection structure of the instrument wiring board of FIG. 1;

FIG. 3 is a partially cutaway side view of the other side of the electrical connection structure of the instrument wiring board of FIG. 1;

FIG. 4 is a front view of a combination meter to which the electrical connection structure of the instrument wiring board of FIG. 1 is applied.

FIG. 5 is a rear view of the combination meter of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrical connection structure of wiring board for instrument 2 Meter case 3 Flexible wiring board 4 Hard wiring board 4b Screw hole 4c Peripheral part (of screw hole) 5 Pattern connection part 6 Connector for connector 7 Connector connection part 15 Cover 17 Screw

Claims (4)

[Claims] 1. A pattern connecting portion in which a flexible wiring board and a hard wiring board mounted on a meter case are connected by a surface touch between connection ends of a circuit pattern, and a connection connector interposed between the two wiring boards. An electrical connection structure for an instrument wiring board, wherein the electrical connection structure is electrically connected to a connector connection portion connected by the connector. 2. The electrical connection structure for a wiring board for an instrument according to claim 1, wherein the pattern connecting portion fixes the cover between a cover that covers the hard wiring board and the meter case. An electrical connection structure for a wiring board for an instrument, wherein the flexible wiring board and the hard wiring board are fixed to each other in a sandwich structure by screws. 3. The electrical connection structure for a wiring board for an instrument according to claim 1, wherein a portion of the meter case corresponding to the pattern connection portion has substantially the same height as the connection connector. An electrical connection structure for an instrument wiring board, wherein the electrical connection structure is formed so as to protrude. 4. The electrical connection structure for an instrument wiring board according to claim 1, wherein a connection end of the hard wiring board of the pattern connection portion is the hard wiring board. An electrical connection structure for a wiring board for an instrument, wherein the electrical connection structure is formed around a fixing screw hole formed in the wiring board.