JP2534206Y2 - Connection device between metal base circuit board and external lead wire - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for connecting a metal base circuit board to external leads.

[0002]

2. Description of the Related Art In recent years, metal-based circuit boards have been widely used as mounting boards for circuits that generate a large amount of heat. Accordingly, various methods have been proposed for connection between the metal base circuit board and external lead wires.

[0003] A conventional connection device for connecting a metal base circuit board to external lead wires will be described below.

In FIG. 5, reference numeral 1 denotes a metal-based circuit board;
Is an external lead wire. Reference numeral 10 denotes a connection terminal between the metal base circuit board 1 and the external lead wire 5 which is formed of a metal plate. The metal base circuit board 1 and the external lead wire 5 are connected to the connection terminal soldered to the metal base circuit board 1. The external lead wire 5 is connected to the lead wire 10 by soldering.

[0005] The operation of the connection terminal 10 between the metal base circuit board 1 and the external lead wire 5 configured as described above will be described below. First, the connection terminals 10 are soldered to the metal base circuit board 1, and then the external lead wires 5 are soldered to the connection terminals 10, thereby electrically connecting the metal base circuit board 1 and the external lead wires 5. .

[0006]

However, in the above-described conventional configuration, when the connection terminals 10 are soldered to the metal base circuit board 1, soldering is performed by a reflow furnace simultaneously with other electronic components such as the chip components 9. And the connection terminal 10 falls down or tilts, and stable soldering cannot be obtained. Therefore, the connection terminals 10 must be retrofitted to the metal base circuit board 1 with a soldering iron or the like, which significantly deteriorates the quality of soldering.

Further, when the external lead wire 5 is soldered to the connection terminal 10, the external lead wire 5 is wound around the tip of the connection terminal 10 and soldered with a soldering iron, so that a force is applied to the tip of the connection terminal 10. In addition, the connection terminal 10 may be bent, or the copper foil of the connection land 3 which is a joint between the metal base circuit board 1 and the connection terminal 10 may be peeled off.
There is a problem that disconnection is likely to occur.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. The present invention solves the above-mentioned problems by reducing the joint between the metal base circuit board and the external lead wires without breaking the metal base circuit board. It is an object of the present invention to provide a connection device with a lead wire.

[0009]

In order to achieve this object, a connecting device for connecting a metal base circuit board to an external lead wire according to the present invention comprises a metal base circuit board and a projection provided on the metal base circuit board. And a connection land of the protrusion,
One surface is joined to the connection land, and an external lead wire is electrically connected to the other surface, for example, a metal plate capable of being soldered,
An electrical insulating resin cover is provided which electrically insulates the protrusion and allows the external lead wire to be wound around the outer periphery.

[0010]

With this configuration, the metal plate and the metal base circuit board can be joined together by soldering and mounting other electronic components and the metal plate together with a reflow furnace at the same time, so that a highly reliable joint with a small number of steps can be achieved. can get.

Further, an external lead wire is wound around the outer periphery of the electrically insulating resin cover mounted on the projection of the metal base circuit board and the metal plate, and a soldering iron or the like is applied to the surface of the metal plate around which the external lead wire is wound. A metal that is strong enough to withstand the forces of soldering with a soldering iron, and has no bending of the connection terminals and no peeling of the copper foil of the connection lands. A connection device between the base circuit board and the external lead wires is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a metal-based circuit board;
Is a projection of the metal base circuit board, 3 is a connection land provided on the projection 2 electrically connected to the circuit pattern of the metal base circuit board, and 4 is one side joined to the connection land 3 and the other side. An external lead wire is electrically connected to the surface, for example, a metal plate capable of solder connection, 5 is an external lead wire, 6 is a protrusion 2
Is an electrically insulating resin cover that is electrically insulated and has an outer lead wire 5 wound around the outer periphery.

The metal plate 4 is soldered and mounted on the metal base circuit board 1 at the same time as other electronic components 9 by a reflow furnace or the like. Therefore, the metal plate 4 is soldered to the metal base circuit board 1 like the connection terminal 10 in the conventional example.
Since there is no need for post-attachment, a highly reliable bonding without variation due to soldering can be obtained. The metal plate 4 is mounted on the projection 2 of the metal base circuit board 1, and then the electrically insulating resin cover 6 is attached to the projection 2. Further, the external lead wire 5 is wound around the outer periphery of the electrically insulating resin cover 6. At this time, the external lead wire 5 is simultaneously wound around the electrically insulating resin cover 6 and the metal plate 4 mounted on the projection 2. The metal plate 4 and the external lead wire 5 are electrically connected by soldering or the like (solder portion 20). At this time, since the mechanical strength of the metal plate 4 and the protrusion 2 of the metal base circuit board 1 is strong, the bending of the connection terminals 10 and the connection lands 3 in the conventional example against the pressing force of the soldering iron at the time of soldering. The copper foil does not peel off, and a strong electrical connection can be obtained.

The groove 7 provided on the outer periphery of the electrically insulating resin cover 6 is for ensuring alignment between the external lead wire 5 and the metal plate 4.
This is to prevent the external lead wire 5 wound around the wire from shifting before being soldered.

The claw 8 provided on the electrically insulating resin cover 6 is formed by attaching the electrically insulating resin cover 6 to the projection 2 and then hooking the claw 8 on the metal plate 4. 6 to prevent the protrusion 6 from coming off. Thereby, the step of winding the next external lead wire 5 can be reliably performed.

As described above, the connection device for connecting the metal base circuit board and the external lead wires according to the first embodiment can provide a stronger electrical connection without disconnection as compared with the conventional example, and can reduce the number of manufacturing steps. It has excellent effects.

(Embodiment 2) In FIG. 2, on one surface of the metal base circuit board 1,
Although not shown, printed wiring is formed via an insulating layer, and the driver IC 11, the position sensor 12, other components for surface mounting, and the connecting device according to the present invention are mounted on the printed wiring.

A bare chip component such as a power transistor is mounted on the resin sealing portion 13. Numeral 14 denotes a wound stator core, which is assembled so that the axial ends of the shroud portions 15 and 16 are brought into contact with the drive circuit component mounting surface of the metal base circuit board 1, and as shown in FIG. The finished winding product 18 is obtained.

FIG. 4 is a perspective view showing this state. The winding end 19 of the drive winding 17 as the external lead wire 5 is wound around the outer periphery of the electrically insulating resin cover 6 and is electrically connected to the metal plate 4 by soldering or the like. Fixed.

With the above configuration, there is no short circuit between the winding end 19 of the drive winding 17 which is the external lead wire 5 and the metal base circuit board 1, and the drive circuit on the metal base circuit board 1 A highly reliable connection with the winding end 19 of the drive winding 17 which is the external lead wire 5 can be obtained.

[0022]

As is apparent from the above description of the embodiment, according to the connecting device of the present invention for connecting the metal base circuit board and the external lead wires, the metal base circuit board and the projections provided on the metal base circuit board are provided. And a connection land of the protrusion,
One surface is joined to the connection land, and the other surface is electrically connected to an external lead wire, for example, a metal plate 4 capable of being soldered.
And an electrically insulating resin cover that electrically insulates the protruding portion and allows the external lead wire to be wound around the outer periphery, thereby bending the connection terminal and peeling the copper foil of the connection land as in the conventional example. A connection device between a metal base circuit board and external lead wires, which can perform strong electrical connection without disconnection and without disconnection, can be obtained, and a great effect can be realized in terms of improvement in reliability and reduction in manufacturing man-hours.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a part of a connecting device for connecting a metal base circuit board and external lead wires according to a first embodiment of the present invention;

FIG. 2A is a perspective view of a stator winding part of an application example of a connection device between a metal base circuit board and external lead wires according to a second embodiment of the present invention, which is applied to a motor control metal base circuit board; FIG. 2B is a perspective view of a portion of the metal base circuit board on which the surface mount component and the connection device are mounted.

FIG. 3 is a front view of a completed stator winding product according to the second embodiment.

FIG. 4 is a perspective view of a completed product of the stator winding portion.

FIG. 5 is a perspective view showing a conventional connection device for connecting a metal base circuit board to external lead wires.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal base circuit board 2 Projection part 3 Connection land 4 Metal plate 5 External lead wire 6 Electrically insulating resin cover

 ──────────────────────────────────────────────────の Continued on the front page (72) Muneo Yamamoto 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In company

Claims (3)

(57) [Scope of request for utility model registration] 1. A metal base circuit board, a projection provided on the metal base circuit board, a connection land provided on the projection, and one surface joined to the connection land,
A metal base circuit board including a metal plate on the other surface capable of electrically connecting an external lead wire, and an electrically insulating resin cover in which the protrusion is electrically insulated and the external lead wire is wound around the outer periphery; Connection device for external lead wires. 2. The connection device according to claim 1, further comprising an electrically insulating resin cover having an outer lead winding groove on an outer periphery thereof. 3. The connection device between a metal base circuit board and external lead wires according to claim 1, further comprising an electrically insulating resin cover having a claw portion hooked on a side surface of the metal plate.