JPH0540453Y2 - - Google Patents

Description

[Detailed description of the invention] <Technical field> The present invention relates to a test electrode that is placed on a printed wiring circuit of a printed circuit board and is used to contact a measurement probe when inspecting the continuity and connection status of electronic components. .

<Prior Art> Test electrodes are components that are difficult to avoid when manufacturing electronic devices. However, in recent years, parts have become more and more chipped, and automated mounting machines have become more and more automated.
There is a feeling that test electrodes, which were oddly shaped parts, have been left behind in automatic attachment.

As shown in FIGS. 8, 9, and 10, conventional test electrodes are generally made by inserting a rectangular rod shape, a cylindrical rod shape, or a ring shape into a hole 3 in a printed circuit board 2, and applying dip soldering 4. It was hot.

However, with such a shape, the shape is different from that of other electronic components, and it is difficult to mount the electronic component using an automatic mounting machine, so it is necessary to rely on manual insertion.

<Purpose> In view of the above, the present invention is designed to be used for testing, which enables automation of mounting in the same way as other chip parts by conforming to the shape determined by the chip standard (EIAJ) rather than the pin shape. The aim is to provide electrodes.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

First, the first embodiment of the present invention shown in FIGS. 1 and 2 will be described. In this case, the external shape of the electrode body 5 is a standard chip shape with a horizontal dimension A and a vertical dimension B, and the electrode body 5 is square. Formed in a hollow shape,
The rims 6a, 6b, 6c on one side of the internal cavity 6 and the rims 6d, 6e, 6f on the other side are used as probe engaging portions of the measuring instrument.

Note that, depending on the material selected for the electrode body 5, there are various problems such as the cavity 6 being filled with solder when reflowed or dipped, but in the case of a metal material, the cavity 6 may be filled with solder. , the soldered parts on both outer surfaces 7 and 8 of the electrode body 5, and the upper surface 9 of the electrode body 5.
The parts other than the central measurement probe contact part 10 can be improved by insulating them.

Furthermore, if the electrode body 5 is made of aluminum material, soldering is not possible, so if the shaded portion in FIG. 1 is reversely plated with metal, soldering becomes possible. In FIG. 2, 11 is solder and 2 is a printed circuit board.

In the above configuration, the external shape of the electrode body 5 is a standard chip shape with horizontal dimension A and vertical dimension B, so by adjusting the external shape to the horizontal dimension A and vertical dimension B determined by the standard (EIAJ), Like other chip parts, it can be mounted using an automatic mounting machine, making it compatible with automation.

Note that in order to facilitate automatic attachment, it is desirable to secure a space around where the test electrodes are attached so that an automatic attachment machine can intervene.

After mounting on the printed circuit board 2, as shown in FIG. 2, both outer surfaces 7, 8 of the electrode main body 5 and the circuit on the upper surface of the printed circuit board 2 are soldered.

Note that in the above embodiment, since surface mounting is used, there is a live current part only on one side of the printed circuit board 2. If a checker land 12 or the like is required on the opposite side of the printed circuit board 2, the lower printed circuit board 2 of the chip type electrode body 5 is required.
There is also a method to deal with this problem by providing a through hole 13 as shown in FIG.

FIG. 4 shows a second embodiment of the present invention, in which semicircular notch recesses 14 are formed at the front and rear of the upper plate 9 of the electrode body 5 in order to make the measurement probe fit better against the test electrode. It is something. The other configurations are the same as those of the first embodiment.

In the above configuration, the measurement probe is easily engaged with the test electrode due to the notch recess 14, compared to a case where the flange 6a is flat, and engagement is ensured.

FIG. 5 shows a third embodiment of the present invention, in which the electrode body 5 is formed in a U-shape so that the measurement probe can easily fit onto the test electrode, similar to the second embodiment. A furring 6a on one side of the trunk 6,
6c, the furring edges 6d and 6f on the other side, and the furring edge 6a on the open surface 15 side are used as probe engaging portions, and a measuring probe can be inserted through the U-shaped open surface 15.

6 and 7 show a fourth embodiment of the present invention, in which positioning protrusions 17 are formed at three positions on the bottom surface 16 of the electrode body 5, and the other configurations are the same as those of the first embodiment described above. Similar to the example.

In the above configuration, a positioning hole corresponding to the positioning protrusion 17 is formed in advance on the printed circuit board 2 side, and the positioning protrusion 17 on the bottom surface of the electrode body 5 is engaged with this hole by an automatic mounting machine to perform positioning. do. In this way, it is possible to accurately position the electrode body 5 even in locations where the positional displacement is undesirable.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

<Effects> As is clear from the above description, according to the present invention, the test electrode has a rectangular cavity shape having a cavity through which at least two opposing surfaces are penetrated, and a measurement electrode is formed on the edge of the cavity. Since the tip has an engaging part with a standard probe, it has the same external appearance as a standard chip.For example, if the horizontal and vertical dimensions are adjusted to the dimensions determined by the standard, it can be automatically installed like other chip parts. It has excellent effects as it can be installed on machines and can be automated.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a test electrode showing the first embodiment of the present invention, Fig. 2 is a front view showing the printed circuit board mounted state, and Fig. 3 is a test electrode for testing on the back side of the printed board. 4 is a perspective view of a test electrode showing a second embodiment of the present invention; FIG. 5 is a perspective view of a test electrode showing a third embodiment of the present invention; FIG. Fig. 6 is a perspective view of a test electrode according to a fourth embodiment of the present invention, Fig. 7 is a front view thereof, and Figs. 8, 9, and 10 are front views showing the state in which the conventional test electrode is attached to a board. be. 1... Test electrode, 2... Printed circuit board, 3
...hole, 4...Dip solder, 5...electrode body, 6...
...Cavity part, 7, 8...Both outer surfaces, 9...Top plate, 1
0... Contact portion, 11... Solder, 12... Checker land, 13... Through hole, 14... Notch recess, 15... Open surface, 16... Bottom surface, 17...
Positioning protrusion, A...horizontal dimension, B...vertical dimension.

Claims (1)

[Scope of utility model registration request] 1. A test electrode characterized in that it has a rectangular cavity shape having a cavity portion through which at least two opposing sides are penetrated, and an engagement portion with a measurement probe is provided on a rim of the cavity portion.