JPH08233861A - Pico-probe - Google Patents

Abstract

PURPOSE: To ensure that tapered metal plates of both sides are in contact with an object to be tested in a pico-probe in which a signal needle at an end and the plates at the both sides are aligned. CONSTITUTION: A pico-probe exposes the inner conductor of the end of a coaxially fixed cable 5. A signal needle 1 formed at its end on a needle is connected to the signal pad of a board 4 to be inspected, and in order to ground, tapered metal plates 2, 3 mounted at the right and left ends of an outer conductor are so connected to the ground pattern of the board 4 to be inspected as to be simultaneously connected to the signal needle.

Description

Detailed Description of the Invention

[0001]

This invention relates to picoprobes.

[0002]

2. Description of the Related Art Conventionally, this type of pico probe is one for probing an object to be inspected in a high frequency band to inspect a high frequency signal characteristic, as shown in, for example, a pico probe MODEL 40A manufactured by GGB.

FIG. 3 is a front view of substrate proping by a pico probe showing a conventional example. In FIG.
In the pico probe, the signal needle 1 whose inner conductor is exposed at the tip of the coaxial fixed cable 5 and whose tip is lowered into a cone is connected to the signal pad of the substrate 4 to be inspected and also to the ground, so that it can be connected simultaneously with the signal needle. The tapered metal plates 2 and 3 attached to the left and right ends of the outer conductor are connected to the ground pattern of the inspected substrate 4, and the high frequency signal characteristic inspection is performed.

[0004]

In the above-mentioned conventional pico-probe, since it is not possible to visually confirm that the tapered metal plates on both sides are in contact with the object to be inspected, the measurement accuracy due to the unstable ground can be reduced. It had the drawback of falling.

[0005]

The pico probe of the present invention has a center of a tip end of a coaxial fixed cable for taking a ground with a signal needle whose tip is processed into a conical shape by exposing a central conductor of the tip end of the coaxial fixed cable. The lower surface of the tip of two tapered metal plates connected to the outer conductor at regular intervals on both sides of the conductor is the same as the coaxial connector in the pico-proping that inputs and outputs signals by simultaneously propping the substrate under test. It is configured to include an edge sensor needle for confirming that the two tapered upper metal plates contact the inspected substrate on the mounting surface of the contact monitor substrate connected to the outer conductor of the fixed cable.

[0006]

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention. The pico probe is a signal needle 1 in which the inner conductor of the tip end of the coaxial fixed cable 5 is exposed and the tip is processed into a cone,
In order to establish a ground on the signal pad of the substrate 4 to be inspected, the tapered metal plates 2 and 3 attached to the left and right ends of the outer conductor so as to be connected simultaneously with the signal needle are used as the ground pattern of the substrate 4 to be inspected. Connected.

Further, when the pico probe is not in contact with the substrate 4 to be inspected, the left and right tapered metal plates 2, 2 from the mounting surface of the contact monitor substrate 6 fixed to the outer conductor of the fixed coaxial cable 5. The heights of the left and right edge sensor needles 7 and 8 protruding from the tip 3 are adjusted so as not to contact the left and right tapered metal plates 2 and 3.

FIGS. 2A and 2B are side views showing an example of use of the present invention. If the picoprobe surely contacts the substrate 4 to be measured, it is shown in FIG. 2A. So that the tips of the left and right tapered metal plates 2 and 3 are pressed upwards,
Connected to the left and right edge needles 7,8. Therefore, the left and right tapered metal plates 2 are obtained by conducting a continuity test to the ground of the left and right edge sensor needle lead wires 9 and 10 which monitor the signals of the right and left edge sensor needles 7 and 8 from the contact monitor substrate 6. , 3 can be confirmed to be connected to the inspected substrate.

Further, the pico-probe is a substrate 4 to be inspected.
If you touch it by tilting to the lower left, as shown in Fig. 2 (b),
Only the left tapered metal plate 2 has its tip pressed upward, only the left edge sensor needle 7 is connected, and the left edge sensor needle 8 remains open to the left tapered metal plate 2. In this case, since the left edge sensor needle lead wire 9 is electrically connected to the ground and the right edge sensor needle lead wire 10 is open to the ground, the left and right tapered metal plates 2 and 3 with respect to the substrate to be inspected. It can be confirmed that the ground connection is insufficient.

Further, the pico probe is a substrate 4 to be inspected.
On the other hand, even when tilted to the lower right, the right edge sensor needle lead wire 1
Since 0 is electrically connected to the ground and the left edge sensor needle lead wire 9 is open to the ground, it can be confirmed that the ground connection to the inspected substrate is insufficient.

[0012]

EFFECT OF THE INVENTION In the pico probe of the present invention, the tapered metal plates on both sides are measured by measuring the resistance value against the ground of the edge sensor needle which detects the pressure when contacting the object to be inspected. You can confirm that you are in contact with the test object. This has the effect of preventing a decrease in the measurement angle due to the ground.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

2A and 2B are side views showing a usage example of the present invention.

FIG. 3 is a front view showing a conventional example.

[Explanation of symbols]

 1 signal needle 2 right tapered metal plate 3 left tapered metal plate 4 substrate to be inspected 5 coaxial fixed cable 6 contact monitor substrate 7 right edge sensor needle 8 left edge sensor needle 9 right edge sensor needle lead wire 10 left edge sensor needle lead wire

Claims (1)

[Claims] 1. An outer conductor having a fixed interval on both sides of the center conductor at the tip of the coaxial fixed cable in order to obtain a ground with a signal needle descending a cone on the tip exposing the center conductor of the end of the coaxial fixed cable. The lower surface of the tip of the two tapered metal plates joined to is the mounting surface of the contact monitor board connected to the outer conductor of the coaxial fixed cable in the pico probe that inputs and outputs signals by simultaneously propping the board to be inspected. A pico probe having an edge sensor needle for confirming that the two tapered metal plates are in contact with the substrate to be inspected.