JPS59193092A - Method of machining end face electrode of board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to the case where an electronic circuit such as a hybrid IC is constructed using a substrate material such as alumina or ceramic. The present invention relates to a method of processing end face electrodes of a substrate for forming electrode terminals.

Conventional configurations and their problems In general, electronic circuit assemblies such as hybrid ICs,
It is constructed by stacking C parts and other electronic parts, and alumina, ceramic, etc. are used as the substrate material. Then, as shown in FIGS. 1 and 2, the circuit board has electrode terminals 2 formed at its ends and the center of the front surface (the ends of the four sides). Different electrodes! When the circuit board 1 on which the IW element 2 is formed has a configuration 1,
Configuring other circuits (not shown) on the front and back surfaces of the circuit board 1,
In order to connect it, it is necessary to attach electrode terminals 2 to the front and back surfaces. For this purpose, by using the method shown in Figure 3, electrodes can be applied simultaneously to the ends and the front and back surfaces. It is possible to attach fA child 2. Zunawaji presses the plate 3 whose grooves 4 are filled with ink 5 on the fixed substrate 1. At this time, the plate 3 is deformed as shown in Figure 3 and is pressed against the bottom surface of the substrate 1 as well as the end surface of the substrate 1, so that the ink 5 is transferred to the substrate side and the plate 3 returns to its original position. When the ink 5 returns to the original position, the ink 5 remains on the substrate 1 side, and the dimension A necessary for the upper and lower [nl] can be secured. Looking at the board side at this time, as shown in FIG. 3C, the amount of ink 6 that has been transferred to the substrate is gone. In this case, the printing plate 3 used is provided with a plurality of grooves 4 that widen toward the open end, and is made of an elastic phase such as silicone rubber.

However, in the electrode processing method described above, the ink 5 filled in the long grooves 4 is transferred by pressing the end surface of the substrate 1 against the elastic plate 3, so the force with which the plate 3 is pressed against the substrate 1 is limited. , or pressing length, version 3
Due to the hardness of the material, there is a problem in that the error in the dimensions becomes large and it is difficult to control the dimensions.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a method for processing end-face electrodes of a substrate, which allows electrode terminals to be formed with stable predetermined dimensions on the edges of the front and back flat parts of the substrate. In order to achieve the above-mentioned object, the invention covers the end surface of a substrate on an elastic plate having a groove that widens from the bottom surface toward the open end and a stopper for dividing the groove into a plurality of parts. By pressing so as to intersect with the groove, i)? The conductive ink filled in the J-marked groove is made to adhere to the end face of the substrate and the ends of the front and back flat parts. That is, by providing a crease in the groove so as to be perpendicular to the groove, it is possible to limit the amount of conductive ink that adheres to the front and back flat parts of the substrate, and the conductive ink is formed at the ends of the front and back flat parts. Electric terminals can be stably obtained.

DESCRIPTION OF EMBODIMENTS FIG. 4 shows an embodiment of the present invention, in which 11 is a substrate made of alumina, ceramic, etc., 12 is an elastic plate, 13 is a groove provided in the bullet 1 housing plate 12, and 14 is a groove provided in the bullet plate 12. The conductive ink 15 filling the groove 13 is a partition that divides the groove 13, and the partition 15 divides the groove 13 into a plurality of small chambers.

Next, this elastic plate for printing will be explained using FIGS. In the figure, reference numeral 12 denotes a printing plate, which is made of silicone rubber that is generally used in pad printing and the like. A necessary number of grooves 13 into which ink enters are formed on the surface of this rubber. At this time, if the depth D is 0.2 to 0.7, the dimension difference between the bottom and top of the groove C-B = o, 1 to 0.
．． Approximately 2 mm is sufficient. This is to prevent the grooves from being deformed when the plate is pressed against the substrate, causing the dimension C to become slightly smaller and making it difficult for ink to come out of the grooves 13.

The numerical values shown here are groove pitch 1 to 1.5 mm, groove width 0.
．． This is an example of a case where the ink has a dry ink thickness of 6 to 1 cm, a film thickness of 20 to 40 μm after drying, and an ink viscosity of 300,000 centipoise. Therefore, if the components and dimensions of the ink change, the shape and dimensions must be changed slightly. The partitions 16 provided in the grooves 13 of the elastic plate 12 are set to have the dimensions required by the electrode terminals formed at the ends of the front and back flat parts of the substrate 11.

When forming an electrode terminal made of conductive ink on the end surface of the substrate 11 using the elastic plate 12 configured in this way, the conductive ink 14 is placed in the groove 13 of the elastic plate 12, that is, in the recessed part separated by the partition 16. Substrate 1 filled with and fixed
1, press the plate 12 which fills the groove 13 with the groove 13. At this time, the plate 12 deforms as shown in Figure 4 and is pressed against the upper and lower surfaces as well as the end surfaces of the substrate 11, so that the ink is transferred to the substrate side, and when the plate 12 returns to its original position, the ink is transferred. It remains on the board side, and must be on the top and bottom surfaces]'θ mo A can also be maintained at 4 m'. Looking at the board side at this time, as shown in Figure 4, the amount of ink that has been transferred to the board is gone.

In other words, only the ink in the recesses separated by the separation 15 is transferred to the substrate and disappears. Continuous printing can be done by shifting the plate 12 in either the up or down direction by the pitch of the downward movement 16. Furthermore, when ink is automatically supplied and printing is to be carried out continuously, it is also possible to replenish the ink while making the plate 12 circular, cutting a groove around it and rotating it.

Therefore, according to this method, the dimensions of the electrode terminals are stabilized, and electrode terminals can be attached continuously by moving the plate up or down or rotating it.

Effects of the Invention As described above, according to the present invention, since the grooves of the elastic plate for printing are partitioned by partitions, the residue of the conductive ink filled into the bottom section separated by the partitions is constant, so that the elastic plate is Even if there is some variation in the length of pressing the plate against the substrate and the hardness of the elastic plate, the A dimension of the electrode terminal can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional circuit board, FIG. 2 is a front view thereof, FIG. 3 is an explanatory diagram of an electrode processing method for the same board, and FIG. 4 is a process explanatory diagram of an electrode processing method of the present invention. FIG. 6 is a plan view of an elastic plate used in the same method, and FIG. 6 is a front view thereof. 11...Substrate, 12...Elastic plate, 13.
...Groove, 14...Conductive ink, 15...
・・・ Shikiri. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 435-

Claims (1)

[Claims] An elastic plate is provided with a groove that opens from the bottom surface and expands toward the I end, and a partition is provided in the groove to divide the self-calibration groove into a plurality of grooves, so that the end of the substrate crosses the groove. A method for processing an end face electrode of a substrate, characterized in that the conductive ink filled in the groove is stuck to the edge of the substrate and the edges of the front and back flat parts by pressing the groove.