JPH11273808A - Terminal part structure and manufacture of terminal part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the yield of soldering by winding around an insulating base, conductor pieces formed by cutting a ribbon-like raw material in a predetermined length, bending both their ends to put and fix them in the recessed parts of the back surface of the insulating base, so as to use them as terminal metal fittings, and soldering the parts of the terminal metal fittings along the undersurface of the insulating base to mating terminal mounting conductors. SOLUTION: Provided to an insulating base 1 are a protrusion streak 21, capable of positioning terminal metal fittings 3, recessed parts 22 at predetermined positions in its back surface and a protrusion 23 at its undersurface that is so fitted into a hole 51 of a board 5 as to position it. Both ends of the terminal metal fittings 3, which are bent and wound around the insulating base 1 and, interpose the protrusion streak 21 between them are bent to put and fix them in the recessed parts 22 in such a manner as to place both the ends of the terminal metal fittings 3 in the recessed parts 22. The terminal metal fittings 3 are soldered to conductors 6 on the board 5 side by applying soldering paste 4 to parts along the undersurface of the insulating base 1, mounting the metal fittings on a predetermined position of the mating board 5 and passing it through a heating furnace and soldered to the conductors 6 of the board 5 side. Thereby, the soldered parts will not lift from the mating board, and the material cost and equipment expense such as a die and the like can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a manufacturing method of a terminal portion in an electric device.

[0002]

2. Description of the Related Art It is a common practice to provide a terminal portion on a circuit board and use the terminal portion directly as a terminal portion of the electric device itself or as a connection terminal with another circuit board.
In this case, the terminal part is configured separately from the circuit part and soldered to the circuit side, but if soldering is done manually, it is very inefficient, so the terminal part is soldered A method has been used in which cream solder is applied in advance, and soldering is automatically performed through a tunnel furnace with the terminal portion placed at a predetermined location on the other side. Here, the terminal portion attached to the circuit by the above-described method has a structure as shown in FIG. In this figure, reference numeral 1 denotes an insulating table, which has a flat bottom groove in which the terminal fitting 3 is fixedly positioned and into which the terminal fitting 3 is wound. The terminal fitting 3 is bent at the front end to the lower edge of the front surface of the insulating base 1 and is bent at the middle part along the rear surface of the insulating base.
Is bent to the lower edge of the rear surface of the insulating base, and the terminal fitting 3 is attached to the insulating base so that the terminal fitting 3 is held by the insulating base. A portion 32 of the terminal fitting 3 after the middle portion extends to the rear of the insulating base. The extension 32 is soldered to the conductor on the circuit side. At this time, the solder is automatically applied by applying cream solder as described above.

[0003] The terminal is manufactured as follows. As for the terminal fittings, a large number of sets of terminal fittings are continuously punched into a strip, and the terminal fittings are wound around the insulating stand at an insulating stand 1 held at a predetermined position, and a connection between the terminal fittings is provided. The part is cut off. Because of this, there is a lot of material loss at the trace of taking the terminal fitting from the band-shaped material, and one set of terminal fittings is punched in the same arrangement as the terminal part, so for each model There was also a problem that it was necessary to change the fittings, equipment costs increased, and it took a long time to deal with the change of the model.

[0004]

In the conventional terminal structure described above, the extension 32 of the terminal fitting does not follow the extended surface of the bottom surface of the insulating base 1 as shown in the figure, but instead jumps upward or bends downward. Ordinarily, when placed on the circuit-side substrate, the extension 32 does not follow the circuit-side conductor pattern,
Simply applying cream solder and passing it through the heating furnace did not work well, and when passing through the furnace, it was necessary to take measures to hold down the terminals to the other party. The present invention eliminates such measures and seeks to significantly improve the soldering yield. Another object is to reduce material loss, simplify dies and the like, reduce equipment costs, and speed up response to model change.

[0005]

Means for Solving the Problems A conductor piece obtained by cutting a ribbon-shaped raw material to a predetermined length is wound around an insulating base constituting a terminal portion, and both ends thereof are bent and fixed in rear recesses of the insulating base. And a portion of the terminal fitting along the lower surface of the insulating base is soldered to a mating terminal mounting conductor.

[0006]

FIG. 1 shows one embodiment of the present invention. 1A is a perspective view of a terminal portion, FIG. 1B is a cross-sectional view taken along a line I in FIG. A, and FIG. 1C is a side cross-sectional view of the terminal portion mounted on a substrate. In the figure, reference numeral 1 denotes an insulating stand constituting a terminal portion, and reference numeral 3 denotes a terminal fitting. A ridge 21 for determining the position of the terminal fitting 3 is formed on the insulating base 1. The protrusion is substantially the same as the thickness of the terminal fitting 3 on the lower surface of the insulating stand, and has a height protruding from the surface of the terminal fitting on the other surface. A recess 2 is provided on the rear surface of the insulating base 1 at a position where the terminal fitting is to be mounted.
2 are formed. The terminal fitting 3 is bent and wound around the insulating base 1 between the ridges 21 so that both ends are located on the rear surface of the insulating base 1, and both sides of the terminal fitting 3 are bent into the recesses 22 on the rear surface of the insulating base 1. . Thus, the terminal fitting 3 is connected to the insulating base 1.
To be fixed.

As shown in FIG. 1C, cream solder 4 is applied to a portion of the terminal fitting 3 along the lower surface of the insulating base 1 as shown in FIG. 1C. When placed at a predetermined position on the circuit board 5 and passed through a heating furnace, the cream solder melts and the terminal fitting 3 is soldered to the conductor 6 on the board 5 side. At this time, a projection 2 is provided on the lower surface of the insulating base 1 so that the terminal portion is placed at a predetermined position on the circuit board.
3 is formed, and on the substrate 5 side, a hole 51 into which the protrusion is fitted is provided. Cream solder, also known as reflow solder, is a paste made by mixing solder powder with a flux, and is applied in advance to the lower surface of the terminal fitting of the terminal part or at a predetermined position before fixing the terminal fitting to the insulating stand. Or may be applied to the substrate side. In any case, the paste solder is dried and solidified after application. A printing method can be applied to the coating.

FIG. 2 shows another embodiment of the present invention. In this example, the width of both ends of the terminal fitting 3 is narrowed by cutting one side on the right side and the other side on the left side, and bending both ends along the rear surface of the insulating base 1. The projections 25 of the insulating base 1 protruding between the portions are crushed by ultrasonic heating or heat fusion, and both ends of the terminal fitting 3 are fixed to the rear surface of the insulating base 1. The above-described structure of FIG. 1 is suitable for a case where the terminal fitting is slightly thick and durable, and the structure of FIG. 2 is thin and the terminal fitting is merely bent into the recess on the rear side of the insulating base as shown in FIG. Suitable when firm fixing is difficult.

FIG. 3 shows a procedure for assembling the terminal portion of the present invention which can be applied to any of the above cases. The terminal fitting is supplied as a ribbon-shaped material 3P having the same width. The same number of the ribbons as the terminal fittings are arranged at intervals corresponding to the arrangement of the terminal fittings, and the ribbon-like material 3P is fed out by a predetermined length on the insulating table 1 held at a predetermined position, and cut.
It is wound around the insulating base 1 so as to be bent at the corners of the insulating base 1. When cutting the ribbon-shaped material 3P to a predetermined length,
The notches at both ends of the terminal fitting 3 are also cut at the same time as in the case of FIG. After the terminal fitting is attached to the insulating base 1 in this manner, both ends of the terminal fitting are engaged with the rear surface of the terminal base. In the case of FIG. 2, a process of crushing the projection 25 of the insulating base 1 by heating and pressing is performed as this attachment process.

In the above-described assembling method of the present invention, the conventional method shown in FIG. 4 punches out the original material in a form in which a plurality of terminal fittings are arranged in accordance with the arrangement interval of the plurality of terminal fittings in the terminal portion. Material loss between the terminal fittings and the joint between the pair of terminals and the terminal fittings was extremely uneconomical, but the material loss of the terminal fittings was almost eliminated, and depending on the model, the spacing between the terminal fittings and If the number changes, it is necessary to change the mold accordingly, and problems such as the large size of the mold and the cost of equipment, and the time required to respond to the change of the model are eliminated.

[0011]

According to the present invention, the terminal fitting is soldered to the circuit board at a portion along the lower surface of the insulating base, so that the soldering portion does not float from the counterpart and it is difficult to perform soldering. Since the raw material may be a ribbon-shaped material having the width of the terminal fitting, advantages such as reduction in material costs, equipment costs such as dies, and quick response to model change can be obtained as described above.

[Brief description of the drawings]

FIG. 1 shows an example of an embodiment of the present invention, in which A is a perspective view,
B is a cross-sectional view taken along line I of A, and C is a cross-sectional view in an actual use state.

FIG. 2 is a perspective view of another example of the embodiment of the present invention.

FIG. 3 is a perspective view showing an assembling order of the terminal portion of the present invention.

FIG. 4 is a perspective view of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation stand 3 Terminal fitting 4 Solder 5 Substrate 6 Conductor

Claims (2)

[Claims] 1. A conductor piece cut from a ribbon-shaped conductor to a predetermined length is wound around an insulating table constituting a terminal portion, and both ends thereof are bent and fixed in recesses on the rear surface of the insulating table to form a terminal fitting. A terminal portion structure in which a portion of the terminal fitting along the lower surface of the insulating base is soldered to a counterpart terminal mounting conductor. 2. The method according to claim 1, further comprising the step of arranging a plurality of ribbon-shaped members having the same width as the terminal fittings in the same number as the terminal fittings in the terminal portion, in accordance with the arrangement intervals of the terminal fittings. , And each cut piece cut into a predetermined length is bent at each corner of the terminal block and wound around the terminal block, and both ends of each fragment are engaged with the terminal block at the rear surface of the terminal block. Manufacturing method of the terminal part.