JP3629811B2 - Wiring board with connection terminal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiring board with connection terminals used in various electronic devices, particularly power circuits such as inverters and power supply circuits.
[0002]
[Prior art]
In recent years, high-density mounting of electronic components has been required due to the downsizing, high functionality, and combination of electronic devices, and the heat generated by the electronic components used affects the reliability and life of the electronic components in the vicinity. Can be given.
[0003]
Therefore, a wiring board on which electronic components are mounted using a heat conductive metal plate that also serves as heat radiation is used.
[0004]
Hereinafter, a conventional wiring board with connection terminals will be described with reference to the drawings.
6 is a perspective view of a conventional wiring board with connection terminals, FIG. 7 is a cross-sectional view of the main part thereof, and in FIGS. 6 and 7, 11 is an electronic component mounted to form an electronic circuit, and 12 is Conductor foil for forming a wiring pattern for constituting an electronic circuit, 14 is a plate-like base metal made of a heat conductive material provided with heat radiating fins 16 on one side, and 13 separates and insulates the conductor foil 12 and the base metal 14 from each other. An insulating layer 15 made of a resin material or the like that is bonded and integrated together, is a conductor pin made of a metal material for electrical connection with an external circuit, and is electrically and soldered on the conductor foil 12 of the wiring pattern. It is mechanically fixed and serves as an external connection terminal of the wiring board.
[0005]
[Problems to be solved by the invention]
However, in the conventional wiring board with connection terminals, the insulator layer 13 is required, and the external connection terminals are configured by soldering the conductor pins 15 as separate parts to the conductor foils 12 on the base metal 14, There is a problem that the mechanical strength is insufficient, positioning at the time of assembly is difficult, and the production cost such as parts cost and assembly cost becomes high.
[0006]
An object of the present invention is to provide a wiring board with connection terminals that has connection terminals with excellent mechanical strength and positioning accuracy and can reduce production costs.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention forms and integrates a conductive plate made of a metal material on which a wiring pattern constituting an electronic circuit is formed and a molded resin body made of a resin material containing a filler. In the wiring board that is mounted and connected, the upper surface and both side surfaces of the part to bend the connection terminal with the outside are exposed without being in close contact with the molded resin body, and the creepage necessary for the predetermined insulation from the end surface of the molded resin body The wiring board with connection terminals is formed into an integrated structure by a part of the conductor plate, which is bent at a distance position and raised on the electronic component mounting side.
[0008]
According to the present invention, a connection terminal having excellent mechanical strength and positioning accuracy that does not require a separate part can be obtained, and the production cost can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, the upper surface and both side surface portions of the portion to be bent at the creepage distance position required for predetermined insulation are brought into close contact with the molded resin body from the end surface of the molded and integrated molded resin body. It is a wiring board with connection terminals that is exposed and bent and is connected to the outside that is raised on the electronic component mounting side, providing positional accuracy in bending and no damage to the molded resin body In addition to this action , the insulation is maintained.
[0012]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 is a perspective view of a wiring board with connection terminals in the same embodiment, FIG. 2 is a perspective view of a processed conductor plate for forming an electronic circuit, FIG. 3 is a perspective view of the resin-molded wiring board, and FIG. FIG. 5 is a perspective view of the main part of the connecting terminal bending process, and FIG. 5 is a perspective view of the main part of the conventional connecting terminal bending process.
[0013]
1 to 3, reference numeral 1 denotes a conductor plate, which is made of copper or its alloy material or aluminum material subjected to surface treatment such as nickel or tin plating, and is connected to a mounting hole 2 and a connection terminal 5 to the main body. A wiring pattern shape constituting an electronic circuit including the terminal portion 5a, the mounting land 10 having a shape and area corresponding to necessary heat radiation, and the frame portion 9 is formed by pressing or the like.
[0014]
4 is a molded resin body, which uses an insulating resin material containing a thermally conductive filler, and has a mounting hole 3 that is slightly larger than the outer area of the electronic component 8 and the mounting missing portion 3 of the escape screw such as a mounting screw to the main body. The part 7 and the connection terminal part 5a are bent to form a terminal chip part 6 to be a connection terminal 5 and integrally formed with the conductor plate 1 by injection molding or the like.
[0015]
The electronic component 8 is a passive element (resistor, capacitor, inductor, mechanism component, etc.) such as a chip structure for constituting an electronic circuit, an active element (transistor, diode, IC, etc.) or a composite element. The mounting land 10 is connected and fixed electrically and mechanically by soldering or a conductive and heat conductive adhesive.
[0016]
Next, a manufacturing method will be described.
First, as shown in FIG. 2, the conductor plate 1 processed into a predetermined wiring pattern shape and simultaneously or post-processed so that the vicinity of the mounting hole 2 becomes the lower end surface of the completed wiring board is not attached as described above. After providing the part 3, the terminal chip part 6, and the mounting hole part 7 and integrally molding with the molded resin body 4, the unnecessary frame part 9 is cut and separated as shown in FIG.
[0017]
Next, the predetermined electronic component 8 is connected and fixed to the mounting land 10 of the predetermined mounting hole 7, and the connection terminal portion 5 a is bent toward the electronic component 8 side at a predetermined angle, for example, 90 degrees to form the connection terminal 5. A wiring board is completed.
[0018]
Next, the bending process for manufacturing the connection terminal 5 will be described. FIG. 5 shows an example of a general bending process. When the connection terminal part 5b is bent at a predetermined angle in the arrow direction at the position E, both side surfaces and the lower surface except the upper surface of the connection terminal part 5b are molded resin. Since it is in close contact with the body 4, resistance in bending is large, and it is difficult to accurately bend the predetermined shape and position into the connection terminal 5, but in the present invention, as shown in FIG. Due to the convex portion provided in the mold at the time of integral injection molding of the conductor plate 1 and the molded resin body 4, the distance C of the creepage distance necessary for insulation and withstand voltage, the connection terminal portion 5a and the molded resin body 4 is obtained. A terminal chip portion 6 having a distance B (for example, 0.5 to 2 times the width of the connection terminal portion 5a) for preventing the contact between the connection terminal portion 5a and the connection terminal portion 5a at a position A in the direction of the arrow (for example, 90 degrees) so as to form a connection terminal 5 having an end face distance D by bending. Therefore, there is no molded resin body 4 in the vicinity of the connection terminal portion 5a, and since the upper surface and both side surfaces are not in close contact with the molded resin body 4, the molded resin body 4 in the vicinity of the connection terminal portion 5a is cracked. The bending force is small and the bending accuracy is good.
[0019]
【The invention's effect】
As described above, according to the present invention, it is possible to obtain an external connection terminal that does not require a separate part and has excellent mechanical strength and positioning accuracy, and can improve quality and reduce production costs. The advantageous effect is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a wiring board with connection terminals according to an embodiment of the present invention. FIG. 2 is a perspective view of a processed conductive board for forming an electronic circuit. FIG. 4 is a perspective view of a main part of the connection terminal bending process. FIG. 5 is a perspective view of a main part showing a general example of the connection terminal bending process. FIG. 6 is a perspective view of a conventional wiring board with connection terminals. Sectional view of the same part [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Conductor plate 2 Mounting hole 3 Mounting missing part 4 Molded resin body 5 Connection terminal 5a, 5b, 5c Connection terminal part 6 Terminal missing part 6a Terminal missing part 7 Mounting hole part 8 Electronic component 9 Frame part 10 Mounting land

Claims (1)

A conductor plate made of a metal material on which a wiring pattern constituting an electronic circuit is formed and a molded resin body made of a filler and a resin material are molded and integrated, and an external connection terminal is integrated by a part of the conductor plate. In the wiring board with connection terminals ,
From the end surface of the molded and integrated molded resin body, the upper surface and both side surfaces of the portion to be bent at the creepage distance position required for predetermined insulation are used as external connection terminals that are exposed without being in close contact with the molded resin body. Wiring board with connection terminals.

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