JPH048375Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a resistance measuring probe having multiple electrodes used for measuring electrical resistance.

[Conventional technology]

Generally, electrical resistance measurement is performed by connecting the measuring device itself and the object to be measured using a cable or the like, but the influence of the internal electrical resistance of the cable or the like that transmits the signal poses a problem.

Therefore, in order to eliminate such internal electrical resistance, conventional electrical resistance measurements have been made by connecting two wires, a current-only line and a voltage-only line, to one side of the object to be measured, and measuring the voltage of the current-only line. A resistance measurement method was used to prevent measurement errors due to drop, and this measurement method measured the resistance of the object by applying a specified current to the object through a dedicated current line. .

In this resistance measurement, the current-dedicated line and voltage-dedicated line to the object to be measured are conventionally connected by soldering or clips, or if this is inconvenient, a probe or an electrode such as copper is connected to the object to be measured. I was pushing it and going.

In other words, as this type of probe or electrode, a contact with a tip protruding from the center of a pipe-shaped contact is attached with a spring, as disclosed in Japanese Utility Model Application No. 52-87943 and Japanese Utility Model Application No. 54-134077. There is a known method in which measurement is performed by pressing both contacts against a part to be measured.

[Problem that the invention attempts to solve]

However, when measuring resistance by pressing such a probe or electrode against an object to be measured and connecting it, if the contact of the probe does not come into even contact with the object to be measured, for example, during the measurement operation, If the probe is not moved perpendicular to the object being measured,
There was a problem in that the contactor was pressed in a biased manner, which was affected by the internal resistance of the probe or electrode, resulting in measurement errors. In addition, when a spring is installed inside the probe, the pipe diameter cannot be reduced, which limits miniaturization.In addition, automatic assembly and measurement work for mass production are complicated, resulting in poor work efficiency and high costs.

The present invention aims to eliminate these conventional drawbacks, and provides an inexpensive resistance measurement probe that does not require precision in operating the probe on the object to be measured and is extremely effective in measuring resistance without measurement errors. Moreover, it is intended to contribute to ultra-miniaturization and to be easy to integrate into automatic assembly lines for mass production, greatly improving work efficiency.

[Means to solve the problem]

The present invention consists of an insulating component 1 in which a conductive needle stem electrode 1 having a tip that can come into contact with an object to be measured and an insulating part 2 on the outer periphery near the tip is fixed to a conductive socket part 5.
The outer electrode part 3, which is formed of a conductive spring 4 and is arranged in an isolated annular manner around the insulating part 2 at the tip thereof, is slidably provided on the socket part 2 to form an inner electrode part 13. The needle stem end 8 of the needle stem electrode 1 is fixedly held at the other outer end of the socket part 5 by a spring 11 via a flange 10, and the socket part 5 and the needle stem This is a resistance measuring probe characterized in that an end 8 is connected to a measuring device main body 6 via lines 7 and 9.

〔Example〕

An embodiment of the present invention will be described with reference to FIG. 1. A conductive needle stem electrode 1 having a tip capable of contacting an object to be measured and an insulating portion 2 on the outer periphery near the tip is fixed to a conductive socket portion 5. The needle stem electrode 1 is attached to the inner electrode part 1 by being slidably provided in an insulated state via the insulating part 12.
3, and an outer electrode part 3 formed of a conductive spring 4, which is located in an annular manner isolated around the insulating part 2 at the tip thereof, is connected to one outer end of the socket part 5, and The needle stem end 8 of the needle stem electrode 1 is fixedly held at the other outer end of the socket part 5 by a spring 11 via a flange 10, and a line is connected between the outer peripheral end of the socket part 5 and the needle stem end 8 of the needle stem electrode 1. 7 and 9 are connected to the measuring device main body 6.

In this case, an insulating layer 2 is provided to cover the outer periphery near the tip of the needle stem electrode 1, and a conductive spring 4 isolated and arranged in a ring shape around the insulating layer 2 is used as the outer electrode part 3. The conductive spring 4 is connected to one outer end of the socket part 5, and the socket part 5 is connected to the measuring instrument main body 6.
On the other hand, the needle stem electrode 1 is connected to a line 9 that leads to the measuring device main body 6 via the needle stem end 8. A spring 4 constituting the outer electrode part 3 is fixed to one end of the socket part 5, and contracts when the outer electrode part 3 is pressed, and expands when the pressing force is removed, returning the outer electrode part 3 to its original position. It is equipped to restore.

Further, the needle stem electrode 1 is fixedly held at the other outer end of the socket part 5 by a spring 11 via a flange 10 provided on the needle stem end 8 side, and is slidably held by an insulating part 12 that is fitted and fixed to the socket part 5. Since the needle stem electrode 1 is movably provided, when the needle stem electrode 1 is pressed, the spring 1
1 expands, and when the pressing force is removed, it contracts to return the needle stem electrode 1 to its original position.

Further, the insulating component 12 is fitted into the inner diameter of the socket portion 5 and provided separately at both ends, and has a fitting hole approximately equal to the outer diameter of the needle stem electrode 1, and has a fitting hole that is approximately equal to the outer diameter of the needle stem electrode 1 and the outer diameter of the needle stem electrode 1 and the outer electrode portion 3. Prevent contact. Further, the socket portion 5 and the needle stem end 8 are connected to lines 7 and 9, respectively, by soldering or other methods.

When measuring resistance according to this embodiment, when pressing the probe against the object to be measured manually or mechanically, the needle stem electrode 1 is brought into contact with the measurement point, and then when the socket part 5 is pressed, the needle stem electrode 1 is The outer electrode part 3 is retracted to the state where it does not protrude, the outer electrode part 3 contacts the object to be measured M, and the spring 4 contracts to press the outer electrode part 3 evenly over the entire surface of the object to be measured. become.

This outer electrode section 3 provides conduction to the object to be measured from the measuring device main body 6 through the line 7, the socket section 5, and the spring 4, and even if the outer electrode section 3 swings, the insulating section 2 on the conductive needle stem electrode 1 provides continuity. An insulated state can be maintained, and on the other hand, the needle stem electrode 1 serving as the inner electrode portion 13 provides conduction to the object to be measured via the line 9 and the needle stem end 8 from the measuring device main body 6. The outer electrode portion 3 and the needle stem electrode 1 are insulated by an insulating component 12, and the outer electrode portion consisting of the outer electrode portion 3, the spring 4, and the socket portion 5, the needle stem electrode 1, the needle stem end 8, and the flange. 10 and an internal electrode portion consisting of a spring 11 are connected via an insulating component 12 as described above.

Further, as shown in FIG. 2, an outer electrode 14 is attached to the spring 4.
It may also be used to provide signals from the main body of the measuring instrument.

Further, to explain another embodiment of the present invention, in a circuit where precision resistance measurement is required, when one electrode of the object to be measured M has a nickel or cross-shaped electrode, the probe is attached to the object to be measured M. The tip shape of the needle stem electrode 1 is made to correspond to the cross-sectional forming angle of the cross groove of the cross twist of the object to be measured M, and a contact pressure of 100 g is applied to the object to be measured M by the spring 11.
A current of 30 mA was applied, and the voltage drop between the object to be measured M and the electrode at the other end was measured using the outer electrode section 3.

In this case, the outer electrode part 3 and the needle stem electrode 1 are brought into complete contact with the irregularities of the object to be measured due to the springs 4 and 11, and the distance between the object to be measured M and the electrode is adjusted. It became possible to measure electrical resistance.

[Effect of idea]

In the present invention, separate springs are fixed and held at both outer ends of the socket part for the inner electrode part and the outer electrode part under insulated conditions, and the outer electrode part is also composed of springs, so precision is required for probe operation. Even if the outer electrode contacts the object at an angle without tilting, the outer electrode can make full contact with the object, allowing accurate measurement without resistance errors. Accurate resistance measurements can be performed even on certain objects to be measured, and even if the external electrode part swings against the conductive needle stem electrode, the insulating state is maintained by the insulating layer on the needle stem electrode, making it safe. It is easy to handle resistance measurements, and it contributes to miniaturization compared to the case where the spring is internally installed in the socket, and it is easy to assemble on an automatic assembly line for mass production, making it easy to work. It has great practical effects, such as greatly improving production efficiency and increasing production efficiency.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being a partially cutaway side view and FIG. 2 being a side view of another embodiment. DESCRIPTION OF SYMBOLS 1... Needle stem electrode, 2... Insulating layer, 3... Outer electrode part, 4, 11... Spring, 5... Socket part, 6
... Measuring device main body, 7, 9 ... Line, 8 ... Needle stem end, 10 ... Flange, 12 ... Insulation parts, 13
...Inner electrode part, 14...Outer electrode.

Claims (1)

[Scope of utility model registration request] A conductive needle stem electrode 1 having a tip capable of contacting an object to be measured and an insulating part 2 on the outer periphery near the tip is attached to an insulating part 12 fixed to a conductive socket part 5 so as to form an inner electrode part 13. An outer electrode part 3 formed of a conductive spring 4, which is arranged so as to be slidable and arranged in an annular manner isolated around the insulating part 2 at the tip thereof, is extendably connected to one outer end of the socket part 5. With,
The needle stem end 8 of the needle stem electrode 1 is fixedly held at the other outer end of the socket part 5 by a spring 11 via a flange 10, and the socket part 5 and the needle stem end 8 are connected to the measuring machine main body by lines 7 and 9. A resistance measurement probe characterized by being connected to 6.