JPH09166621A - Measuring electrode for circuit tester using lead of pancil as measuring probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the trouble and dead time which are unavoidable for properly using the electrode of a circuit tester and a writing utensil for recording at the time of tasting an electric circuit. SOLUTION: A circuit taster B is electrically conducts through a pencil lead 1 being a conductor, a metallic electrode 2, a lead collet 3, a lead tank 4, a cap 5, and a lead wire 6. The sheath 6a of the lead wire 6, a penholder 8, and a cap crown 9 are made of insulators so as to prevent electrical shock. The lead 1 is held in the penholder 8 by means o the electrode 2, the collect 3, a floating ring 11, a spring 12, and a fixed ring 7 and constitutes an electrode A which is also used as a writing utensil. the shape of the electrode A is deformed so as to incorporate an electric circuit in the electrode A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring electrode A for a circuit tester which also has the function of a writing instrument. And a structure of various testers in which the shape of the measurement electrode A is deformed and an electric circuit is incorporated therein.

[0002]

2. Description of the Related Art When a circuit test of an electronic device is manually performed, it is confirmed by a circuit tester whether the electronic device is manufactured according to written documents such as a circuit diagram and a wiring table, and the result is checked by a circuit. The measuring electrode of the tester was changed to a writing instrument and recorded on a document to prevent omission or duplication of test points. This changeover operation is troublesome, and it takes 3 to 4 seconds for one changeover. If the waiting time is changed 1,000 times a day, the total time will be one hour. Also, since the writing instrument is small, I often lose sight of it, and it took a lot of time to find it.

[0003]

SUMMARY OF THE INVENTION For the purpose of reducing the annoyance caused by alternately holding the measuring electrode and the writing instrument described in the prior art and the wasteful time associated with waiting,
This invention was made.

[0004]

[MEANS FOR SOLVING THE PROBLEMS] Focusing on the fact that the pencil lead is conductive, and using the pencil lead as the measuring probe of the measuring electrode, it is possible to use both the measuring electrode and the writing instrument.

[0005]

The measuring current shown in FIG.
Core collet 3-Core tank 4-Cap 5-Lead wire 6-
Circuit tester B-Lead wire C-Existing measurement electrode D-Subject E
Then, the circuit tester B operates. Further, the pencil lead 1 is held on the pen shaft 8 by the electrode 2, lead collet 3, floating ring 11, spring 12, and fixed ring 7, and can be used as a writing instrument.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The structure is shown in the sectional view of FIG. The cap 5 to which the cap crown 9 is fixed is detached, and a plurality of pencil leads 1 are put in the lead tank 4.
By repeatedly pressing, the pencil lead 1 projects from the electrode tip 2a. Since the structure is basically the same as the existing mechanical pencil except that it has the lead wire 6 and the cap crown 9,
Description of the same parts will be omitted.

Since the first purpose of the measuring electrode A of the invention is to energize, a metal material is used for the electrode 2, the core collet 3, the core tank 4, the cap 5, the lead wire 6, the fixed ring 7, and the floating ring 11. Further, the pen shaft 8, the cap crown 9, and the lead wire covering material 6a
Uses an insulator to prevent electric shock. The lead wire 6 is connected to the cap 5, and the circuit tester B is energized.

The energization is hindered by the deposit on the contact surface of the subject E. In that case, since the pencil lead 1 is soft and it is difficult to remove the attached matter, the pencil lead 1 is pushed in or broken, and the attached matter is scraped off by the electrode tip portion 2a, and the electrode tip portion 2a is brought into contact. Therefore, the electrode tip portion 2a has a stronger structure than the tip portion of the existing mechanical pencil.

[0009]

Since the pencil lead 1 serves both as the measuring probe 1a and the writing instrument, the writing instrument for recording is unnecessary. Therefore, it is possible to reduce the annoyance and wasteful time associated with changing hands.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a measurement electrode A and its related diagram.

FIG. 2 is a perspective view of a shape in which a pen shaft 8 is deformed and an electric circuit is incorporated therein.

FIG. 3 is a perspective view of a shape in which an electric circuit is built in by modifying the cap crown 9.

[Explanation of symbols]

 A Measurement electrode of the invention A B Circuit tester C Lead wire D, F, G Existing measurement electrode E Subject 1 Pencil lead 1a Measuring probe 2 Electrode 2a Electrode tip 3 Core collet 4 Core tank 5 Cap 6 Lead wire 6a Covering material for lead wire 7 Fixed ring 8, 8a, 8b Pen shaft 9, 9a, 9b Cap crown 10 Rubber ring 11 Floating ring 12 Spring

Claims (2)

[Claims] 1. A measuring probe (1a) -core collet (3) or electrode (2) -fixed ring (7) -core collet (3) is energized and thereafter, core tank (4) -cap (5)-. A measuring electrode (commonly called probe-hereinafter the same) A for a circuit tester (commonly called tester-hereinafter the same) using a pencil lead as a measuring probe, which has electrical continuity with the lead wire (6). 2. The shape of the pen shaft (8) or the cap cap (9) of the measuring electrode A according to claim 1 is modified, and an electric circuit is built in the deformed pen shaft (8) and FIGS. Structure of various conforming test equipment.