JPH0370393B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a drawing-type thick film printing apparatus.

Conventional structure and problems The conventional drawing method thick film printing equipment and method are
It is arranged as shown in FIGS. 1 to 4. 1 is a cartridge storing resistance paste;
2 is a nozzle having a paste discharge port; 3 is a thick film substrate; 4 is an XY table that holds the thick film substrate 3 and moves in the XY directions, which are two orthogonal directions;
5 is an air tube that is connected to the cartridge 1 and sends compressed air; 6 is a head frame that fixes the cartridge 1; 7 is a frame; 8 is a
This is a control unit that controls and drives the XY table 4.

FIG. 2 is an enlarged view of the tip of the nozzle 2. 9 is a resistance paste, and the paste 9 is pressed by compressed air in the direction of arrow A. 10 is a drawn resistor after drawing the resistor paste 9; 11 is the resistor paste in a drawn state; and 12 is a conductor pattern formed on the thick film substrate 3.

The drawing shows the gap H between the nozzle 2 and the thick film substrate 3.
Press the resistance paste 9 and press the XY table 4.
By moving in the direction of arrow B, the pattern is drawn like the drawing resistor 10 formed between the conductive patterns 12 and 12a.

Figures 3a and b show the discharge amount of the resistance paste 9 by compressed air that presses the resistance paste 9 and the time of drawing.
This shows the correlation with the moving speed of the XY table 4. FIGS. 4a and 4b show the states of the respective drawing resistors 10 at the timings shown in FIGS. 3a and 3b.

In the case of the timing as shown in FIG. 3a, in the side cross-sectional shape of the drawing resistor 10, the part where the drawing thickness h is stable with respect to the drawing length L is L2, as shown in FIG. , the writing end portion L3 draws a gentle curve and is a portion where resistance values vary.

In the case of timing as shown in Fig. 3b, the side cross-sectional shape of the drawing resistor 10 becomes as shown in Fig. 4b, and the drawing thickness increases by Δh at the writing start part L1 and writing end part L3, so resistance value becomes unstable.

As mentioned above, changes in paste discharge amount and XY
The conventional method in which the movement timings of the table 4 do not match each other has the disadvantage that the drawn thickness has a large unstable portion and it is difficult to obtain a predetermined resistance value after firing.

OBJECTS OF THE INVENTION The present invention eliminates the above-mentioned drawbacks and provides an apparatus that moves a thick film substrate in accordance with the amount of paste discharged so that the writing start portion and writing end portion are minimized.

Structure of the Invention The thick film printing apparatus of the present invention includes a cartridge storing a resistance paste therein, a compressed air source connected to one side of the cartridge, and a nozzle provided on the other side of the cartridge and having a resistance paste discharge port. and an XY table that holds the thick film substrate and moves it horizontally in the XY direction, and the time from when the resistance paste starts to be discharged from the resistance paste discharge port until the discharge amount reaches a stable discharge amount. and the time it takes for the XY table to start moving and reach its maximum speed, and the time it takes for the resistance paste discharge amount to decrease and the resistance paste to stop completely, and the time it takes for the XY table to decelerate and stop completely. By having a control means for controlling the XY table to equalize the time,
With respect to the drawing length, it is possible to obtain the maximum stable drawing length.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 5 and 6. Figure 5 shows the correlation between the amount of resistance paste discharged and the movement timing of the XY table 4. The time period P1-P2 from the start of resistance paste discharge until the paste discharge amount reaches a stable discharge amount is t1. Yes, and the time it takes for the XY table to start moving and reach maximum speed is t1
It is set so that Also, the time of section Q1-Q2 at the end of writing, where the pressure air is cut off and the amount of paste discharged from the nozzle gradually decreases, is t3, and the time of the deceleration section of the XY table at this time is also
It has become t3. FIG. 6 shows the side cross-sectional shape of a resistor drawn under the timing conditions shown in FIG.
The stable part is long, and the shape at the beginning and end of writing is quite close to the ideal rectangular shape.

As described above, the XY
By adjusting the table movement timing,
Unstable parts at the beginning and end of writing are kept to a minimum, so variations in the resistance value of the writing resistor are small, and the overlap length S between the conductor pattern and the resistor paste can be reduced, allowing for high-density thick film circuit boards. The transformation is measured.

Effects of the Invention As described above, the present invention provides the following advantages: the time from when resistance paste starts to be discharged from the resistance paste discharge port until the discharge amount reaches a stable discharge amount, and the time from when the XY table starts moving and reaches the maximum speed. Further stabilization of the drawing thickness can be achieved by having a control means for controlling the XY table so as to equalize the time and the time required for the resistor paste to completely stop when the amount of discharged resistor paste decreases. , the electrical properties are improved. Furthermore, since the incomplete drawing length at the beginning and end of writing is short, the overlapping length with the conductor pattern can also be shortened, so that great effects such as increasing the density of thick film circuits can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional thick film printing device, Fig. 2 is an explanatory diagram showing the drawing state of the same device, Fig. 3 a, b
4A and 4B are side sectional views of a conventional drawing resistor, and FIG. 5 is a drawing of a thick film printing apparatus according to an embodiment of the present invention. The timing chart and FIG. 6 are side sectional views of the drawing resistor. 1... Cartridge, 2... Nozzle, 3... Thick film substrate, 4... XY table.

Claims (1)

[Claims] 1 A cartridge storing resistance paste inside, a compressed air source connected to one side of the cartridge, a nozzle provided on the other side of the cartridge and having a resistance paste discharge port, and holding a thick film substrate and horizontally and an XY table that moves XY to the point where the resistance paste starts to be discharged from the resistance paste discharge port until the discharge amount reaches a stable discharge amount and the time when the XY table begins to move and reaches the maximum speed. XY
A thick film printing apparatus comprising: control means for controlling an XY table so as to equalize the time required for the table to decelerate and stop completely.