JPS5842218A - Electronic part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electronic components, and particularly to the configuration of electrode terminals thereof.

To assemble an electronic circuit, holes are drilled into a so-called printed circuit board, which has the required conductor pattern formed on its surface in advance, into which electrode terminals for various electronic components such as resistors, capacitors, conductive elements, and connectors are inserted. A method is extremely widely used in which electrode terminals of required electronic components are inserted into the holes and connected to the conductor patterns.

Figure 1 shows a state in which electronic components are mounted on a printed wiring board using the conventional method.
Figure 1 is a BFiaTM diagram. In the figure, (1) is a printed wiring board, (2) is a conductive pattern formed on its surface, and (3) is a printed wiring board (1) formed from above this conductive pattern (2). hole, (4) is an electronic component,
(5) are the electrode terminals of the electronic component (4), each with a hole (3
) and fixed with solder (6). After the electrode terminal (6) is inserted into the hole (3) K, it is bent if necessary and then fixed with solder (6).

However, with these conventional methods, soldering is a cumbersome process, and if the solder does not flow properly, it may cause electrical or mechanical contact failures and reduce the reliability of electronic circuits. This invention has been made in view of the above-mentioned points, and is directed by the Company and the Company to provide an electronic part protrusion with an electrode terminal structure that is easy to attach to a printed wiring board and also provides reliable contact. It is an object.

Figure 2 and B are the first and second figures of this invention, respectively.
FIG. 5 is a perspective view showing an embodiment of the present invention, and (5a) is an electrode terminal using a shape memory alloy, which is the main point of the present invention. Shape memory alloys include, for example, titanium (TI) - Tsukel (Ni) alloy, copper (Ou) - aluminum (mu/) - zinc (Zn).
If it has a composition such as an alloy and is formed into the desired shape,
When plastic deformation is applied to this material at a stage where it becomes a martensitic state at a low temperature, and the temperature is then raised, the crystal state returns to its original state and the shape returns to the shape before plastic deformation.

Therefore, as in the illustrated embodiment, the electrode terminal (5a) of the electronic component (4) is made of a shape memory alloy, and its shape at 1K (high temperature phase) is as shown in FIG.
The printed wiring board (11) is shaped so that it does not come out of the hole (3) when inserted into the hole (3), and the printed wiring board (11) is tightened by the outer circumference of the hole (3).

In order to mount such electronic components (4) on the printed wiring board +11, all electronic components (4) are brought to a low temperature and their electrode terminals (5a) are placed in a fumarunsite state, and in this state, each Insert the electrode terminal (5a) of the electronic component (4) into the required hole (3). This color is for each electrode terminal (5a)
easily undergo plastic deformation and are manually or automatically machined (
can be easily inserted into s). After inserting all the electrode terminals (5a), when the temperature is raised and returned to room temperature, the crystalline state of the shape memory alloy returns to its original state, and the shape of the electrode terminals (5a) returns to its original shape, as shown in Figure #I3. As shown, printed wiring board (
1) Electrical and mechanical contact is securely fixed.

If the temperature increase by 1 is insufficient and the electrode terminal (5a) is not fixed enough, even if there is Ir, by passing current, heat will be generated in the electrode terminal part with poor contact, promoting the recovery of the shape, and the electric current will be removed. 〇The shape of the electrode terminal is not limited to the above example, but is required! ! Needless to say, it can be selected arbitrarily depending on the situation.

As explained above, since the electronic component according to the present invention uses a shape memory alloy for the electrode terminal, mounting on the printed wiring board for assembling the electronic circuit only requires insertion under image temperature, and soldering is required. It is extremely easy and does not require any steps, and after returning to room temperature, sufficient electrical and mechanical contact is ensured, improving assembly reliability.

[Brief explanation of the drawing]

Figure 1 shows a state in which electronic components are mounted on a printed wiring board using the conventional method.
Figures A and B are perspective views showing the first and second embodiments of the invention, respectively, and Figure 3 is a side view showing how these embodiments are mounted on a printed wiring board. It is. In the figure, (1) is a printed wiring board, (3) is a hole, and (4) is a printed wiring board.
) is an electronic component, and (5a) is an ij electrode terminal. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno - (1 other person) Figure 1 Figure 2 Figure 3v4

Claims (1)

[Claims] (1) It is composed of a shape memory alloy, and at room temperature (high temperature), it has a shape that tightens the printed wiring board with the outer circumference of the hole into which it is inserted, and in a low-temperature martensitic state, it tightens around the hole of the printed wiring board. tf! Equipped with electrode terminals that can be easily inserted! j-electronic components.