JPH04105069A - Contact probe - Google Patents

Abstract

PURPOSE:To enable a circuit board to be protected against damage by using a roller at a mechanical contact section between a contact probe and an object for detection. CONSTITUTION:A roller 1 is in contact with an electrode pattern 10 on a circuit board 11, and a spring probe 7 acts to give pressure necessary for electrical continuity via an arm 4 supported on a bearing 6. The roller 1 is supported with a bearing 2. According to the aforesaid construction, an electrical signal can be sent or received without causing any damage to the surface of the circuit board 11 and the electrode pattern 10 thereon.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contact probe used when measuring electrical characteristics of an electric circuit board (hereinafter referred to as a circuit board) or the like.

[Conventional technology]

Conventional contact probes used to measure the electrical characteristics of circuit boards, etc., have a structure in which a mechanical contact terminal part 15 is pushed by a coil spring 14 and moves in the direction 12, as shown in FIG. As shown in Fig. 4, the mechanical contact terminal part 16 had a structure that moved in the direction 12 by a spring caused by the deflection of itself.

[Problem to be solved by the invention]

However, with conventional contact probes, the contact point of the probe tip generally moves in the 12 directions shown in Figures 3 and 4, that is, in the normal direction to the circuit board surface.
It is not suitable for use in which the device is moved in a direction 13 parallel to the circuit board surface that is perpendicular to the normal direction of the circuit board, and in such a case, there is a problem that the circuit board may be damaged. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a probe that does not damage a circuit board when measuring the electrical characteristics of a circuit board or the like by moving the probe in a plane-parallel direction.

[Means to solve the problem]

In order to solve the above problems, the contact probe of the present invention is characterized in that it has a mechanical contact portion with a detection target or a roller. I will explain. The roller 1 is brought into contact with the electrode pattern 10 on the circuit board 11, and the pressure necessary for electrical continuity is applied via the arm 4 supported by the bearing 6 by the spring probe 7 shown in FIG. It also transmits and receives electrical signals via the probe 7. A roller 1, which is a contact terminal, is supported by a bearing 2, and the tip of the roller 1 is tapered and brought into contact with a leaf spring 3 in order to reliably transmit and receive electric signals to and from the roller 1. The pressing force of the spring 3 is also intended to eliminate the thrust between 0--)-1 and the bearing 2. Two rollers 1 are arranged, one on each side of the housing 9, to improve detection reliability by detecting the same level, or to enable different uses such as detecting two locations with one housing. In order to avoid signal interference between the probes, the shaft 5 supporting the bearing 6 is made of an electrical insulator. In order to improve the contact reliability of the roller, the rounded end portion of the roller 1 that comes into contact with the electrode pattern 10 needs to be mirror-finished.

Furthermore, in order to suppress the occurrence of defects such as dents during fitting with the bearing 2 and during the machining process, it is effective to use a pre-baton material such as carbide or stainless steel that does not require anti-rust treatment such as plating.

〔Effect of the invention〕

According to the invention described above, when the probe is used in such a way that the tip of the detection probe is made into a roller and is moved within the surface of the circuit board in parallel with the circuit board, the surface of the circuit board or the electrode on the circuit board is used. It has the effect of allowing electrical signals to be sent and received without damaging the pattern.

[Brief explanation of drawings]

FIG. 1: A cross-sectional plan view of the roller probe of the present invention. FIG. 2: Front view of the roller probe of the present invention. Figure 3: Cross-sectional view of a conventional contact probe using a coil spring. Figure 4: Cross-sectional view of a conventional pin deflection type contact probe. 1 ・ 2 ・ 3 ・ 4 ・ 5 ・ 6 ・ 7 ・ 8 ・ 9 ・ 10 ・ 11 ・ 12 ・ 13 fist 15 fist 16φ Roller bearing plate spring arm axis bearing coil spring type contact probe probe fixed axis probe housing electrode pattern circuit board circuit board Normal direction circuit board surface parallel direction spring probe probe 121 knife/3 lower/3 ¥3 figure ¥4 ■

Claims (1)

[Claims] A contact probe for transmitting electrical signals through mechanical contact, characterized in that the mechanical contact portion with a detection target is a roller.