JPS63219105A - Method of adjusting resistance value of printed resistor - 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 Technical Field The present invention relates to a method for adjusting the resistance value of a printed resistor, and more particularly, to a method for adjusting the resistance value of a printed resistor, and more specifically, for trimming a thick film printed resistor used in integrated circuits or a thin film resistor to obtain a desired circuit. The present invention relates to a method for adjusting the resistance value of a printed resistor to obtain a constant.

BACKGROUND TECHNOLOGY With advances in semiconductor technology, integrated circuits have become larger and more highly integrated. For example, wiring patterns and resistors are printed on substrates such as ceramics, and transistors, diodes, capacitors, etc. Equipped with electronic circuit elements,
So-called function trimming, in which the resistance value of a printed resistor is adjusted to an appropriate operating value while the electronic circuit configured as described above is activated, is becoming popular. The resistance value adjustment range of such a printed resistor is determined by printing at the initial stage, for example, in order to compensate for variations in pair of transistors when a differential comparator circuit is configured with transistors, or to perform inbegence matching with an external circuit. There may also be cases where a change several times the formed resistance value is required.

FIG. 10 is a plan view of a typical prior art, and FIG. 11 is a plan view of another prior art. For example, a pair of main electrodes 1, 2; 3, 4 are formed on a substrate such as ceramic, and a printed resistor 5.6 is formed between each of these main electrodes 1, 2; 3.4. After forming the printed resistors 5 and 6, the resistance value between the main electrodes 1, 2; 3 and 4 is roughly adjusted using a laser beam or the like to a desired value.
Earth)) Rimming 7.8 is performed.

After rimming 7.8 is performed in this way, electronic circuit elements (not shown) connected to each main electrode 1 to 4 are mounted, and fine adjustments are made with these electronic circuit elements activated. , so-called function trimming9,10
was performed to obtain the desired resistance value.

Problems to be Solved by the Invention In the prior art as described above, when trimming is performed within the same plane, the limit for ensuring reliability is to suppress the range of change in resistance value to within 50% of the target value. becomes. For this reason, it has not been possible to meet the demand for significantly changing the resistance value.

An object of the present invention is to provide a method for adjusting the resistance value of a printed resistor, which makes it possible to expand the adjustment range of the resistance value.

Means for Solving the Problems The present invention connects one end of a printed resistor to one main electrode of a pair of spaced apart main electrodes, and connects the printed resistor to the other main electrode. providing one or more auxiliary electrodes connecting the other ends and bypassing the current flowing through the printed resistor along the printed resistor, one end of each auxiliary electrode being connected to at least one side of the main electrode; The other end is connected to the printed resistor at intervals from one end of the printed resistor to the other end, and the auxiliary electrode is selectively cut to change the current path and adjust the resistance value. This is a method for adjusting the resistance value of a printed resistor, characterized by the following.

Function According to the present invention, a pair of main electrodes are arranged with an interval between them,
One end of the printed resistor is connected to the main electrode on one side, and a part of the other end 3 of the printed resistor is connected to the main electrode on the other side. The other end of one or more auxiliary electrodes is connected to the printed resistor at a distance between both ends of the printed resistor, and one end of the auxiliary electrode is connected to at least one side of the main electrode. . By selectively cutting off the auxiliary electrode configured in this way, the bypass path of the current flowing through the printed resistor can be changed and the resistance value can be adjusted.

Example FIG. 1 is a plan view of one embodiment of the present invention.

For example, a pair of main electrodes 11.1 are formed on a substrate such as ceramic.
2 are placed at intervals. One end of the printed resistor 13 is connected to the main electrode 11 on one side, and the main electrode 1 on the other side
2 is connected to the other end of the printed resistor 13. Main electrode 1
In order to bypass the current flowing through the printed resistor 13, an auxiliary electrode 14 is formed at the tip 12a of the second end, and extends from one end of the printed resistor 13 toward the other end. , are connected to the printed resistor 13.

After forming the printed resistor 13 in this manner, 7-earth trimming TF is performed using a laser beam or the like so that the resistance value between the main electrodes 11 and 12 becomes a desired value. 7 earth)
) After the rimming TF is performed, electronic circuit elements such as transistors, diodes, and capacitors (not shown) are mounted on the substrate, and these electronic circuit elements and main electrodes 11 and 12 are mounted on the substrate.
is selectively connected.

The substrate on which electronic circuit elements are formed is subjected to function trimming in an activated state in which each electronic circuit element is energized in order to obtain desired circuit constants.

In this case, if the range of resistance values to be adjusted by this function trimming is within a 50% increase of the target resistance value R, adjustment is performed only with the trimming groove Tc, and if a larger change is required, the auxiliary electrode 14 is used. By cutting, the current path can be changed and the target resistance value R can be obtained.

FIG. 2 shows the main electrode 11.12 with respect to the length a of the connecting part 15 of the auxiliary electrode 14, indicated by reference a in FIG.
It is a graph showing a change in open resistance value R. At this time, the resistance value from the main electrode 11 to the center of the connection part 15 is Ra, and the resistance value from the center of the connection part 15 to the main electrode 12 is R.
If b, then when a=0, the resistance value R between the main electrodes 11 and 12 is expressed as Ra+Rb.

FIG. 3 is a diagram showing the current distribution on the printed resistor 13 when the length of the connecting portion 15 is 81 cm, and FIG. 4 is a diagram showing the current distribution on the printed resistor 13 when the length of the connecting portion 15 is a3. FIG. 3 is a diagram showing current distribution.

The maximum value of the length a is equal to the width W of the printed resistor 13.6 As is clear from FIGS.
It is understood that the current density in the region Wa changes depending on the length a.

FIG. 5 is a plan view of another embodiment of the invention, which is similar to the previously described embodiment and corresponding parts bear the same reference numerals. In this example, the length of the connection part a=W
A plurality of auxiliary electrodes 16°1.7.18 are formed. For example, the distance between the main electrode 11 and the auxiliary electrode 16 is 2L.
The distance between the auxiliary electrodes 16 and 17 is L, the distance between the auxiliary electrodes 17 and 18 is L, and the distance between the auxiliary electrodes 18 and the main electrode 1 is L.
When the distance between the main electrodes 11 and 12 is 2L, and the auxiliary electrode 16 is not cut, the resistance value R between the main electrodes 11 and 12 is a value corresponding to the distance 2L, for example 2Ω, as shown in FIG. , and when the auxiliary electrode 16 is cut, the main electrode 11.1
The resistance value between the main electrode 11 and the auxiliary electrode 17 is 3L.
When the auxiliary electrode 17 is cut, the resistance value of the main electrode 11. When the main electrodes 11 and 12 are cut, the resistance value between the main electrodes 11 and 12 becomes 6 Ω corresponding to the distance 6L between the main electrodes 11 and 12.

Thus the auxiliary electrodes 16, 17 as shown in FIG.
, 18, the main electrode 1.1.1
For example, the resistance value of a 2-open circuit is 6Ω, which is 3 times the initial value 2Ω.
It can be changed up to.

FIG. 7 is a block diagram showing the electrical configuration of a sensor circuit 21 according to still another embodiment of the present invention in which the resistance value adjustment method as described above is used. A sensor S1 that detects temperature or humidity, for example, is connected to one input terminal of a differential amplifier 22 built in a processing circuit such as a sensor signal processing device, and a resistor 2 is connected to the other input terminal of the operational amplifier 22.
3 and 24 provide a divided voltage level.

The resistor 24 is adjusted to correct for variations in the pair of transistors in the sensor S1 and the differential amplifier 22.

A top view of resistor 24 is shown in FIG. This resistance 24
The change in resistance R between the main electrodes 11, 12 is shown in FIG. When the trimming grooves indicated by the reference mark Tea in FIG. 8 are formed, the resistance value between the main electrodes 11 and 12 is R
It rises from 8a to Ra.

Even if the trimming groove Tea is formed in this way, the main electrode 1
When the resistance value between 1.1 and 12 is less than the target value RN, the auxiliary electrode 14 is cut off, thereby causing the main electrode 11. ,
After increasing the resistance value between 1.2 and 1.2 to R81], a desired resistance value Rs can be obtained by forming a trimming groove Tcb. The upper limit of the resistance value obtained by the trimming groove Tcb is indicated by Rh in FIG.

As shown in each of the above-mentioned embodiments, the allowable power amount of the printed resistor 13 does not decrease due to trimming, and the amount of cutting in the trimming can be reduced.
It becomes possible to expand the adjustment range of the resistance value while stabilizing the resistance value.

Effects As described above, according to the present invention, the current path is changed by selectively cutting one or more auxiliary electrodes,
Since the resistance value between the main electrodes is adjusted, the resistance value adjustment range of the printed resistor can be changed greatly.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 shows the main electrode 11.12 with respect to the length a of the connecting portion 15 of the auxiliary electrode 14.
A graph showing changes in open resistance value R, Figure 3 is for auxiliary electrode 1.
Figure 4 shows the current distribution on the printed resistor 13 when the length of the connecting portion 15 of the auxiliary electrode 14 is a3.
FIG. 5 is a plan view of another embodiment of the present invention, and FIG. 6 is a diagram showing the current distribution in the embodiment shown in FIG. 5. Main electrode 1
FIG. 7 is a block diagram showing the electrical configuration of the sensor circuit 21 of still another embodiment of the present invention, and FIG. 8 is the same as that shown in FIG. 7. Sensor circuit 2
FIG. 9 is a plan view of the resistor 24 used in the resistor 24 shown in FIG. 10 is a plan view of the prior art, and FIG. 11 is a plan view of another prior art. 11.12... Main electrode, 13... Printed resistor, 14
゜16.17.18...Auxiliary electrode, 15...Connection part, 21...Sensor circuit, 22...Differential amplifier agent Patent attorney Number of strokes Keiichibu 2nd figure 1l- jlI4 figure 5 T! Figure 6 Figure 9 Figure 10 Figure 11 U-port

Claims (1)

[Claims] One end of a printed resistor is connected to one main electrode of a pair of spaced apart main electrodes, and the other end of the printed resistor is connected to the other main electrode. one or more auxiliary electrodes are provided along the printed resistor to bypass the current flowing through the printed resistor, one end of each auxiliary electrode is connected to at least one side of the main electrode, and the other end is connected to the printed resistor. Connecting printed resistors from one end to the other at intervals, and selectively cutting off the auxiliary electrodes to change the current path and adjust the resistance value. A method for adjusting the resistance value of a printed resistor.