JPH0236133Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a measurement terminal for a leadless electronic component that can maintain electrical continuity accurately and stably over a long period of time during measurement.

Conventionally, measurement terminals called probes as shown in FIGS. 1 to 3 have generally been used to obtain electrical continuity for measuring electronic components.

However, in the probe shown in Fig. 1, there is an indirect current-carrying part by a spring 6 between the contact part 4 that slides elastically on the head and the lead wire connection part 5, and the plating is worn out and dust is removed due to long-term use. Increased contact resistance due to adhesion has become a problem. In addition, in the probe shown in Fig. 2, since the contact part 4 and the lead wire connection part 5 are integrated, the lead wire also moves at the same time each time it is pressed, and the lead wire is likely to break due to long-term use. It was hot.

On the other hand, the probe shown in Fig. 3 has improved the drawbacks of the probes shown in Figs. It is easy to leave marks such as scratches on the surface. Furthermore, since it is difficult to equalize the contact pressure of the needle-shaped portion 7, there is a drawback that the difference in contact pressure causes errors in the characteristic measurement results.

An object of the present invention is to provide a measurement terminal for a leadless electronic component that overcomes the drawbacks of the conventional probes.

According to the present invention, a contact unit portion includes a conductive contact protruding from the lower surface of the tip of a conductive plate spring, a rod-shaped body planted on the upper surface of the conductive contact, and a coil spring surrounding the outer periphery of the rod-shaped body. and an insulating support block portion having a notch portion at one end through which a portion of the rod-shaped body is inserted, and an insulating support block portion having a lower end portion of the leaf spring fixed to the other end. Measurement terminals for electronic components can be obtained.

Hereinafter, one embodiment of the present invention will be described with reference to FIG.

In FIG. 4, a bar-shaped arm part 1d having a disc-shaped contact conductive part attached to the bottom is fixed to one end of a conductive plate spring 1b attached to the lower surface of the insulating support block 2. Further, a coil spring 1c is arranged around the outer periphery of the upright arm portion 1d, thereby forming the contact unit 1.

The support block 2 has a substantially L-shape with a step-like notch on its lower surface, and has a groove 2a at its left tip that guides and freely slides the arm 1d of the contact unit 1. will be established.

Therefore, the coil spring 1c is held between the groove 2a and one end of the leaf spring 1b.

Further, the base 1e of the leaf spring of the contact unit 1 is fixed to the lower surface near the right end of the support block 2 by screws or the like, and a lead wire 3 for measurement is connected to the base 1e of the leaf spring.

Further, a cross-shaped hole is provided on the right side of the support block 2, passing through the support block 2 in the front and back and up and down directions, and serves as a mounting hole 2b which serves as a fulcrum for press-welding the object to be measured.

Next, the function of the measurement terminal of the leadless electronic component according to the present invention will be explained.

In FIG. 4, a contact unit 1 has a contact portion 1a mechanically pressed against a portion to be measured of an electronic component, and the contact pressure is maintained by a plate spring 1b and a coil spring 1c. At this time, if the spring pressure of the leaf spring 1b is set to only support the weight of the coil spring 1c contact portion 1a and the arm portion 1d, the contact pressure will be applied only by the displacement of the coil spring 1c.
Further, electrical continuity is established through the contact portion 1a through the leaf spring 1b and a lead wire 3 connected to the base 1e of the leaf spring.
given by a direct connection with

As described above, according to the present invention, (i) electrical continuity is directly connected from the measurement point to the lead wire via the contact portion, so instability at the time of contact is reduced. (ii) In addition, since the object to be measured can be pressed against the mounting hole 2b of the contact pressure support block portion 2 as a fulcrum, the load of bending and movement of the connecting lead wire is reduced, and breakage of the wire is reduced. (iii) The contact pressure with the object to be measured can be freely set by replacing the coil spring.

Therefore, there is an advantage that damage and scratches on leadless electronic components, which are easily damaged due to slight differences in contact pressure, can be reduced.

[Brief explanation of the drawing]

1 to 3 are side views including a partial sectional view of a conventional probe, and FIG. 4 is a perspective view of an embodiment of the present invention. 1...Contact unit, 1a...Contact part, 1b...
...Plate spring, 1c...Coil spring, 1d...Arm part, 1e...Flat spring base, 2...Support block, 2a...Groove, 2b...Plate hole, 3...Lead wire, 4...Contact Part, 5...Lead wire connection part, 6
...Spring, 7... Needle-like part.

Claims (1)

[Scope of utility model registration request] a contact unit portion having a conductive contact protruding from the lower surface of the tip of a conductive plate spring, a rod-shaped body planted on the upper surface thereof, and a coil spring surrounding the outer periphery of the rod-shaped body; an insulating support block part having a notch part at one end for inserting a part of the coil spring and clamping the coil spring in cooperation with the leaf spring, and a fixing part for fixing the base of the leaf spring at the other end; A measurement terminal for a leadless electronic component, characterized by having the following characteristics: