JPS5890155A - Detector for contact resistance value of plug contact part of printed board - Google Patents

Abstract

PURPOSE:To detect contamination of a plug contact part as a change in resistance, by a method wherein a table, whereon a printed board is placed, and a bed, whereto a contact made of a leaf spring contacting a plug contact part of the printed board, is secured, are relatively moved while energizing the plug contact part and the contact. CONSTITUTION:A table 2, whereon a wiring plate is placed, is installed on an upper surface of a body 1, and wiring plate picture metals 4, 4 are secured to the upper surface of the table 2 by means of a screw 3. A plug contact part 5a, positioned in parallel to a printed wiring plate 5, is mounted to one side of the printed wiring plate 5 detachably installed through the picture metals 4, 4. The table 2 is located so that it can be moved by a lateral moving mechanism 6, a longitudinal moving mechanism 13, and vertical moving mechanism 18. A head 23 is set to an upper surface of one end of a head supporter 21, and a contact pressure of a contact 26, made of a leaf spring, against the plug contact part 5a is variably adjusted. One end of an energizing means is connected to the contact 26, and the other end is joined to a pattern 5b of the wiring 5. Voltage drop output terminals 30, 30 are attached to the body 1, and a change in contact resistance can be detected by a measuring device 31 such as X.Y recorder.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a device for detecting the contact resistance value of a plug in a printed wiring board.

TECHNICAL BACKGROUND TO THE INVENTION When transmitting and receiving signals and power to and from printed wiring boards, or when connecting printed wiring boards to each other, a connector A shown in FIG. 1, for example, is used. In the figure, B is a synthetic resin connector body having a connection hole C, and D and D are contact bins with one end protruding into the connection hole C, and the connector A is formed with these. In addition, E in the same figure is a printed wiring board, Fu same wiring board E
This is the plug provided in the. By inserting this printed wiring board E into the connection hole C, electrical connection between the p1 contact pin D and the plug portion F is established.

The proper electrical connection between the connector and the printed wiring board depends on the surface condition of the plug. Incidentally, if dirt, dust, or other substances are attached to the plug, it may lead to poor contact or an increase in contact resistance. These problems have frequently occurred in the past.

By the way, the above-mentioned problem is not reproducible, and once the normal connection state is restored, it rarely occurs again, so it has been difficult to investigate the cause.

However, in order to investigate the cause of the above-mentioned malfunction, it is important to take countermeasures as a result, such as simulating whether or not it is possible to remove dirt or dust by wiping it off in various cases, and replacing the end of the plug with a new one. This is indispensable for the development of new connectors that can obtain a normal electrical connection regardless of some degree of dirt or the like. However, to the best of the present applicant's knowledge, measuring devices for conducting such cause investigation have not been available in the past.

Purpose of the Invention The present invention was proposed based on the above-mentioned knowledge.The purpose of the present invention is to detect dirt on plugs on printed wiring boards even when they cannot be visually confirmed. ,
It is an object of the present invention to provide a contact resistance value detection device for a printed wiring board plug part that can obtain data useful for investigating the cause of dirt or the like that interferes with the normal electrical connection between the plug part and the connector.

Summary of the Invention That is, the present invention provides a mounting table on which a printed wiring board is placed, and a head to which a contact made of a plate is fixed, which is in contact with a plug part of the printed wiring board on the table. This structure allows the contact to slide relative to the plug while being energized by a moving mechanism. This feature is characterized in that it can be detected as a change.

Embodiment of the Invention The present invention will be explained below based on an embodiment shown in FIGS. 2 to 9.

In the figure, reference numeral 1 denotes a rectangular parallelepiped device main body, and a wiring board mounting table 2 is provided on the upper surface of this main body 1. A wiring board fixture 4.4 is fastened to the upper surface of the table 2 with screws 3.

A printed wiring board 5 is removably placed and fixed on the upper surface of the table 2 via these wiring board fixtures 4, 4. Incidentally, 5a... is a plug part provided on one side line of the printed wiring board 5 having a circuit function and connecting that circuit function to another circuit function, which are arranged parallel to each other and are connected to each other. Furthermore, patterns 5b are led out from these plug portions 5a, respectively, as shown in FIG.゛The above table 2 is attached to the left/right moving machine wt6, and the device main body 1
It is provided so that it can be moved along the left and right directions on the upper surface.

The left/right movement mechanism 6 includes a guide 7 provided on the top surface of the table 2 to guide the movement of the table 2, a motor 8 attached to the top surface of the table 2 capable of forward and reverse rotation, and a motor 8 that is rotated multiple times by the motor 8. The table 2 is provided with a lead screw 9 which is threaded through a part of the table 2.

On the front of the device main body 1, there is a
A changeover switch 10 for setting stop and rotation direction is installed, and an adjustment dial 11 for varying the rotational speed of the motor 8 is also installed.

Further, a first stage 12 is provided on the upper surface of the apparatus main body 1 so as to be movable along the front-rear direction by means of a back-and-forth moving mechanism 13. The back and forth movement mechanism 13 includes a guide 14 that guides the movement of the first stage 12, a lead screw (not shown) that threads through a part of the first stage 12 and cannot move back and forth, and a front end of the lead screw. A fixed rotary operation section 15 is provided. This back and forth movement mechanism 13
The first stage 12 is moved back and forth by manual rotation of the rotation operation section 15.

A second stage pace 16 is attached to the upper surface of the first stage 12 in an upright manner. It is provided. Vertical movement mechanism 7
s B, guide 1 that guides the movement of the second stage 17
9, a rotary operation section 20 provided on the front surface of the second stage pace 16, and a rack and nion (not shown) provided between these rotation operation sections 20 and the second stage 6--ge 17. There is. This vertical movement mechanism 18 moves the second stage 17 up and down by manual rotation of the rotation operation section 20.

A head support 21 is rotatably attached to the second stage 17 via a pivot 22 . Head support 21r1
, a head 23 is attached to the lower surface of one end thereof, and a weight 24 is screwed into a male threaded portion 21s formed at the other end. Heavy! 1124 is movable in the axial direction by its rotational operation, and the magnitude of the contact pressure, which will be described later, is adjusted by this movement. In addition, 2 in Figure 3
Reference numeral 5 denotes a contact pressure indicator provided near the male threaded portion 21a of the head support 21, which is indicated by one end of the weight 24. A contact 26 is fixed to the head 23. The contactor 26 is designed to slide into contact with the plug portion 5&, and is formed by a plate.

Further, in the figure, reference numeral 27 denotes a lead wire constituting a current supply means, one end of which is connected to the contact 26, and the other end connected to the contact turn 5b. A dial 2 of a current regulator 28a that changes the value of the current flowing through the contact portion between the plug portion 5a and the contactor 26 is provided on the front surface of the device main body 1.
8 is installed. Furthermore, a power switch 29 and voltage drop output terminals 30 and 30 are attached to the front surface of the main body 1 of the apparatus. A measuring device 31 such as a ux-y recorder, an electromagnetic oscillograph, or a voltmeter is connected to these output terminals 30 and 30.
1 shows a change in contact resistance.

Next, the detection work performed by the above-mentioned implementation device will be explained.

First, loosen the screws 3, and then
One side edge of the printed wiring board 5 is inserted between the board mounting table 2 and the printed wiring board 5, and then the screws 3 are tightened to place and fix the printed wiring board 5 on the table 2. Thereafter, one end of the lead wire 27 is soldered to the turn 5b of the plug 5a to be measured. Next, by manually operating the rotary operation section 15, the forward and backward movement mechanism 13 moves the first. The head support 2 is moved via the second stage 12.degree. 17, so that the contact 26 faces the center in the width direction of the plug portion 5a to be measured, as shown in FIG. In this state, the measuring device 31 is connected to the voltage drop output terminals 3θ, 30. Then, the head support 21 is raised via the second stage 12 by the vertical movement mechanism 18 by manually operating the rotation operation section 20 .

Next, the weight 24 is rotated and moved to a position that provides the desired contact pressure. After this, the rotary operation unit 20 is operated again to gently lower the head support 21, and the contactor 26
is in contact with one end of the plug portion 5a, and the head support body 2 is
Make sure that 1 is horizontal. Due to this, contact 2
6 contacts the plug portion 12 with a predetermined contact pressure. Next, after turning on the power switch 29 and activating the measuring device 31, the dial 28 is operated to cause a specified current to flow. Thereafter, the adjustment dial 11 is operated to appropriately set the rotational speed of the motor 8, and the changeover switch 10 is operated to operate the left/right movement 9-mechanism 6. Therefore, the motor 8 is driven, and the table 2 is moved by the engagement between the lead screw 9 and the wiring board mounting table 2 in a direction corresponding to the rotational direction of the motor 8. At the same time, the contactor 26 slides along the plug portion 5a to be measured. Then, contact 2
6 and the plug 5b, a voltage drop occurs due to the contact resistance, and a change in this drop is taken out from the voltage drop output terminal 30, 30 and displayed on the measuring device 31. . Therefore, for example, if dust G is attached to the plug part 5a as shown in FIGS. A peak P shown in FIG. 9 appears on the recording paper 311L. Connecting plug part 5b...
・Detection of dirt, etc. is carried out one after another using the same procedure for
Measurements are taken.

That is, by the above-mentioned measurements, it is possible to investigate dirt such as adhesion of dust to the connector part 5a of the printed wiring = JO- board 5, and thereby to prevent contact between the connector part and the connector due to dirt. It becomes possible to analyze defects, etc. In addition, according to the present device, since the contact pressure can be varied, it is also possible to check the wiping force required to remove dirt, including dirt deposits. Therefore, it is possible to use this device to provide necessary data for the development of new plug removal part cleaning tools and connectors, and also to use this device to determine whether or not the desired effects of the above-mentioned cleaning tools, etc. have been achieved. You can also check.

In the above embodiment, the wiring board mounting table is moved left and right, and the head support body including the head is moved up and down and back and forth. However, by moving the table back and forth,
The head support may be moved up and down and left and right, and the table may be moved up and down.

In addition, when implementing the present invention, specific structures, shapes, and positions of the device main body, wiring board mounting table, head support, head, contact, each moving mechanism, energizing means, voltage drop output terminal, etc. It goes without saying that the material and the like can be configured and implemented in various ways as long as they do not go against the gist of the present invention.

The present invention, which has been described in detail, has the structure set forth in the claims above, and therefore, by making the plug part and the contactor in contact with it relatively slide while energizing them, It is possible to detect dirt and the like on the plug as a change in resistance value, and since the detection is based on a change in resistance value, it is also possible to detect dirt and the like that cannot be visually confirmed. Therefore, according to the present invention, it is possible to provide a detection device that can obtain data that contributes to the investigation of the cause of dirt and the like that interfere with the normal electrical connection between the plug part and the connector.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a connector connected to a printed wiring board. 2 to 9 show one embodiment of the present invention, FIG. 2 is a perspective view, FIG. 3 is a partially sectional side view of the contact pressure adjusting section, and FIGS. 4 to 7 are respectively FIG. 8 is a sectional view showing a part of the apparatus, FIG. 8 is a plan view showing a part of the plug of the printed wiring board, and FIG. 9 is a partial plan view of a recording paper showing an example of the foot measurement results. 1... Device body, 2... Wiring board mounting table, 4...
... Wiring board fixing tool, 5... Printed wiring board, 5a... Connecting part, 6... Left and right moving mechanism, 13... Back and forth moving mechanism, 18... Up and down moving mechanism, 21...・Head support,
23...Head, 24...Contact pressure adjustment part (heavy, Su)
, 26... contact, 27... energizing means (lead wire)
, 30... Voltage drop output terminal, 31... Measuring device. Applicant's agent Patent attorney Takehiko Suzue 13-

Claims (2)

[Claims] (1) A device body, a wiring board mounting table provided on the top surface of this device body for mounting and fixing a printed wiring board, and sliding contact with the connector of the printed wiring board placed on this mounting table. A head support body equipped with a head to which a contactor of a plate spring shank is fixed, and a vertical, horizontal and front-back movement 4a structure in which the above-mentioned mounting table and the above-mentioned head are relatively movable in the up-down, left-right and front-back directions. A printed wiring board plug, comprising: an energizing means provided on the device main body for energizing the contact and the plug portion; and a voltage drop output terminal provided on the device main body. contact resistance value detection device. (2) The printed wiring board according to item (1) of the scope of the patent, wherein the head support is formed with a contact pressure adjustment part that can vary the contact pressure with respect to the plug part of the contact. Contact resistance value detection device for the plug.