JPH11284370A - Electrical circuit connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an electrical circuit connection structure smaller at a lower cost. SOLUTION: A metal terminal plate connector 12 to be connected with an external electronic equipment and a metal wiring board 13 constituting part of an electronic circuit are inserted and molded together in a resin case 11 housing a circuit board 16. Part of the metal wiring board 13 is exposed to form a bonding part 13b, to which a heating electronic part is bonded and a radiating part 14 is provided on part of the metal wiring board 13 so that no heating electronic part nor a radiating block, etc., therefor is required on the circuit board 16 to make the electrical circuit connection structure smaller at a lower cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connection structure of an electric circuit in a control unit or the like for housing an electronic circuit board in a resin case.

[0002]

2. Description of the Related Art In recent years, in a connection structure of an electric circuit in an electronic device, a case for protecting a circuit board tends to be formed of resin in order to reduce the weight and size of the unit. Further, since a connector for connecting an external electronic device is generally formed of a resin, a connector and a case are integrally formed of a resin.

FIG. 3 shows a connection structure of an electric circuit using a conventional connector-integrated resin case. Resin case 1
, A metal terminal plate 2 constituting a connector for an external electronic device is integrally insert-molded. The metal terminal plate 2 has its inner end 2 a inserted into the through hole 3 a of the circuit board 3 and is soldered to the circuit board 3. The circuit board 3 is formed of an FR-4 material, and an electronic circuit is formed on a surface of the circuit board 3, on which the CPU 4, the heat-generating electronic components 5, and the like are mounted. A heat radiating block 6 is fixed to the heat generating electronic component 5 with screws 7 for heat radiation. Circuit board 3
Is disposed in the resin case 1, fixed to the resin case 1 by screws 8, covered with a resin cover 9 from above, and sealed by screws 10. All the electric signals input from the metal terminal plate 2 are processed inside the circuit board 3 and output again from the metal terminal plate 2 as output signals.

[0004]

The conventional connector-integrated resin case 1 has a simple structure, but requires a heat-dissipating block 6 when the heat-generating electronic components 5 are mounted on the circuit board 3. Therefore, there is a limit in miniaturizing the connection structure of the electric circuit. In addition, the use of a component such as the heat radiation block 6 increases the number of assembling steps and the number of parts management steps, which causes a cost increase.

An object of the present invention is to solve such a conventional problem and to provide a small-sized and low-cost electric circuit connection structure.

According to the present invention, in order to achieve the above object, a metal terminal plate of a connector for connecting to an external electronic device is integrally insert-molded in a resin case accommodating an electronic circuit board and one of the electronic circuits is formed. The metal wiring board constituting the part is also integrally formed in the same resin case by insert molding. This allows the metal wiring board to share a part of the function of the circuit board, thereby reducing the connection structure of the electric circuit. Further, by connecting the heat-generating electronic components to the metal wiring board, there is no need to attach a heat-dissipating block or the like, and the cost can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a connector for connecting to an external electronic device, a metal terminal plate and a metal wiring board constituting a part of an electronic circuit, and an electronic circuit board. This is a connection structure of an electric circuit characterized by being integrally insert-molded in a resin case to be housed, and by sharing a part of the function of a circuit board to a metal wiring board in the resin case, the connection structure of the electric circuit. Can be reduced in size and cost.

According to a second aspect of the present invention, there is provided a connection structure for an electric circuit according to the first aspect, wherein a part of the metal wiring board is exposed and an electronic component is connected to the exposed part. In addition, by connecting electronic components to the metal wiring board, there is an effect that a part of the circuit of the circuit board can be shared between the metal wiring board and the electronic components connected thereto.

According to a third aspect of the present invention, there is provided a connection structure for an electric circuit according to the second aspect, wherein the electronic component connected to the metal wiring board is a heat-generating electronic component. Has an effect that the influence on the circuit board due to heat generation can be prevented.

According to a fourth aspect of the present invention, there is provided a connection structure for an electric circuit according to any one of the first to third aspects, wherein the metal wiring board has a heat storage or heat radiation portion. Providing the heat storage or heat dissipation portion on the wiring board has the effect of reducing the need for a heat dissipation block or the like required only for heat storage or heat dissipation.

According to a fifth aspect of the present invention, a step portion for receiving a circuit board is provided in a resin case, and connection end portions of a metal terminal plate and a metal wiring board protruding from the step portion are provided on the circuit board. 5. The connection structure for an electric circuit according to claim 1, wherein the circuit board is electrically connected to the circuit board by soldering through the through hole. Since the circuit board can be fixed to the resin case, the screw for fixing the circuit board to the resin case can be reduced.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment) FIG. 1 is an exploded perspective view of a control unit showing a connection structure of an electric circuit according to the present embodiment.
Is a sectional view thereof. 1 and 2, in a resin case 11, a metal terminal plate 12 constituting a connector for an external electronic device and a metal wiring board 13 sharing a part of a function of a circuit board 16 are integrally insert-molded. Have been. The metal terminal plate 12 is formed in an L shape, and is embedded in the resin case 11 so that only the outer end 12a and the inner end 12b are exposed. Also, the metal wiring board 13
Is formed in an L-shape larger than the metal terminal plate 12 so that only the outer end 13a and the inner end 13c thereof and the divided joint 13b in the middle of the one metal wiring board 13 are exposed. It is buried in the resin case 11. Also,
A heat radiating portion 14 having a large area is formed continuously to one of the joining portions 13b of the metal wiring board 13, and a heat-generating electronic component 15 is joined to the joining portion 13b by reflow soldering. The metal terminal plate 12 is mainly used for small signals, and the metal wiring board 13 is mainly used for large signals of a power system. The circuit board 16 is formed of FR-4 material,
An electronic circuit is formed on the surface, and the CPU 17 and the like are mounted. The circuit board 16 is formed by the step 1 of the resin case 11.
Inserting and soldering the inner end 12b of the metal terminal plate 12 and the inner end 13c of the metal wiring board 13 which are put on and protrude from 1a and 11b into the through holes 16a and 16b, respectively, It is fixed to the resin case 11. A resin cover 18 is put on the resin case 11 and sealed with screws 19.

As described above, according to the above embodiment,
Metal terminal plate 1 of connector for connecting to external electronic equipment
2 and a metal wiring board 13 forming a part of an electronic circuit,
Each of them is integrally insert-molded in the resin case 11 for housing the circuit board 16, and a part of the metal wiring board 13 is exposed to form a joint 13 b, where the heat-generating electronic component 15 is formed.
And a heat radiating portion 1
Since the circuit board 4 is provided, it is not necessary to provide a heat-generating electronic component and a heat-dissipating block for the heat-generating electronic component on the circuit board 16 unlike the conventional case, and the connection structure of the electric circuit can be reduced in size and cost. In addition, the circuit board 16 is
1 on the step portions 11a and 11b.
Inner end 12b of the metal wiring board 13
c is projected from the through holes 16a and 16b of the circuit board 16 and soldered to the circuit board 16,
Since the circuit board 16 can be fixed to the resin case 11 simultaneously with the electrical connection of the metal terminal board 12 and the metal wiring board 13 to the circuit board 16, there is no need to screw the circuit board 16 to the resin case 11 as in the related art. Further, cost reduction can be realized.

[0014]

According to the present invention, as is apparent from the above embodiment, a metal terminal plate of a connector for connecting to an external electronic device is integrally insert-molded in a resin case accommodating an electronic circuit board. The metal wiring board that constitutes a part of the electronic circuit is also integrally insert-molded in the same resin case, so that part of the function of the circuit board can be shared by the metal wiring board and the connection structure of the electric circuit is downsized. And an effect that cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a control unit showing a connection structure of an electric circuit according to an embodiment of the present invention.

FIG. 2 is a sectional view of the control unit.

FIG. 3 is an exploded perspective view of a control unit showing a connection structure of an electric circuit in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Resin case 11a, 11b Step part 12 Metal terminal board 12a Outer end part 12b Inner end part 13 Metal wiring board 13a Outer end part 13b Joint part 13c Inner end part 14 Heat radiating part 15 Heat generating electronic component 16 Circuit board 16a, 16b Through hole 17 CPU 18 Resin cover 19 Screw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shigeru Kondo 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A metal terminal board of a connector for connecting to an external electronic device and a metal wiring board constituting a part of an electronic circuit are integrally insert-molded in a resin case accommodating an electronic circuit board. The connection structure of the electric circuit. 2. The connection structure for an electric circuit according to claim 1, wherein a part of the metal wiring board is exposed, and an electronic component is connected to the exposed part. 3. The connection structure for an electric circuit according to claim 2, wherein the electronic component connected to the metal wiring board is a heat-generating electronic component. 4. The connection structure for an electric circuit according to claim 1, wherein the metal wiring board has a heat storage or heat radiation portion. 5. A step for receiving a circuit board in a resin case, and connection ends of a metal terminal plate and a metal wiring board protruding from the step are soldered through through holes provided in the circuit board. The connection structure for an electric circuit according to claim 1.