JPS5976401A - Resistant paint and resistor formed thereby - 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 The present invention provides a temperature coefficient (
(hereinafter referred to as 'r'T CRJ), and also improved the voltage coefficient of noise and resistance value (hereinafter referred to as 7rrVC!RJ).
It has improved resistance.

Insulating substrate JT, K A thick film resistor formed with a film made of ruthenium oxide and glass has a resistance value of several Ω/K when the ratio of ruthenium oxide to glass is in the range of 60:40 to 5:95.
[The desired resistance value is obtained by varying from Tll to IQM, D/Tj.

It is desirable that the resistance value of the resistor does not change depending on the ambient temperature IJj (r), that is, jcR is 0 during use. However, the relationship between the resistor value and TCH is Although it varies depending on the glass composition and grain size, there is a region where TCP is 0 in the edge resistance region, but at this boundary there is a low resistance value of 1. As the resistance value increases, the To hill becomes positively large and the resistance value becomes high. becomes (・(two jq−′r
L! It has the disadvantage that R becomes negative and is easily affected by ambient temperature over most of the resistance value range.

As a method for improving TCR, it is known to incorporate various additives. For example, MnO2, A'l, 03
Tie2, ZrO2, etc. (d T CR ((has the effect of shifting in the negative direction, and is effective for resistors in the low resistance range that have a positive TCRi. However, in the case of resistors in the high resistance range For example, U.S. Patent No. 6,324,049 describes adding oxidized steel or using Kara 7 containing oxidized steel, but when oxidized copper is added, TCR approaches 0. , at the same time the resistance value decreases,
Moreover, vCR also worsens. Also British Special i-F No. 1.470.
．． No. 497 states that colloidal A100H' (it is stated that when added, TOR changes in the positive direction,
In this case, the resistance value also decreases. Therefore, as a result,
It was not possible to obtain a TCR close to 0 in the high resistance range. There is a method to coarsen the particle size of ruthenium oxide (ruthenium oxide), but this method increases noise and causes variation in resistance, making it unsuitable for use in dog hearing. This could not be said to be a preferable method for improving TOH in the high resistance range.

In order to solve all of these problems, the present inventors investigated ωI and created a ruthenium oxide glass resistor 1' that exhibits a high resistance value.

It was discovered that TCR, Noise, and VOR'i could be improved by adding lanthanum oxide and/or neodymium oxide, and an application for Japanese Patent Application No. 56-210207 was filed earlier. As a result of further research, we found that both praseodymium acid damage and samarium oxide showed excellent TCR improvement, noise, and VCR feeding effects, and that these oxides were used in combination with lanthanum oxide and neodymium oxide. It was also found that there is an effect of increasing the number of times.

The present invention comprises: 1) (a) ru)'nium oxide, (b) glass, and (C
) praseodyno, oxide and/or samarium oxide, and (d) heavy equipment vehicle (2) (a) ruthenium oxide, (b) glasst, (
(2) A resistive paint consisting of praseodymium oxide and/or samarium oxide, (d) lanthanum oxide and/or neodyno, (e) an organic vehicle, (b) an insulating substrate J- ( A resistor formed entirely of a resistance coating consisting of a) ruthenium oxide, b) glass, and (C) praseodymium oxide and/or neodyno oxide, (4) ruthenium oxide (8,) on an insulating substrate. and,? )
(C) praseodymium oxide and/or samarium oxide, and (d) lanthanum oxide and neo7m oxide. When divided into ruthenium-glass resistors, it approaches TCRiO, but has a special effect of lowering the resistance.This is because conventional additives have the drawback of making the resistance smaller. It has extremely unique performance from the viewpoint of resistance and strength.Therefore, the resistor obtained by the present invention has a TCR
Not only does it have better resistance, but it also contains more conductive particles and less glass than conventional resistors with the same resistance value, which reduces noise and improves VCR performance. It is true.

As described above, the addition of praseodymium oxide and samarium phosphate produces excellent effects that could not be expected from the prior art. These oxides may be used alone or in combination with O, sulfur oxide, or neodymium oxide, and exhibit the same or better effect.

The ruthenium oxide, glass, and organic vehicle used in the resistive paint of the present invention may be those commonly used in resistive paints. Ruthenium oxide (Ruthenium oxide) may be used in the form of being pretreated and incorporated into glass.

There are no particular restrictions on the particle size of praseodymium oxide, samarium phosphide, lanthanum oxide, and neodymium oxide;
~2μ is preferable. These oxides may be used by impregnating glass in advance, or ruthenium oxide may be fed to glass at the same time. Praseodymium oxide, samarium 11 oxide, lan, tan oxide and neodymium oxide are a combination of ruthenium oxide and glass TT100:
A total of 0.05 to 7 parts/eta is used for every i part. If it is less than 0.05 mw parts, the effect of gradual addition is not seen at all, and if it is used in excess of 7 mw parts, T(, R will become soft on the negative side, and TCR will not be improved.

In the present invention, the weight ratio of ruthenium oxide and glass is 60 near 0.
This is particularly effective when manufacturing a resistor in a high resistance range of ~5:95.

The present invention will be explained below with reference to Examples, but the present invention is not limited thereto.

Table 1 shows the implementation 1 tari 1-10. Ratio+1 Examples 1 to 6 are also shown. For ease of comparison, examples and comparative examples with the same resistance value are shown. Each side except Examples 7-10,
After mixing the respective components shown in Table 1, roll mixing was performed to obtain a uniformly dispersed resistance paint. The glass used had an average particle diameter of 3.3%, and the specific surface area of the ruthenium oxide was 2ro+u, 79 was used.

The organic compound was a homogeneous mixture of 7.5 parts by weight of ethyl cellulose, 625 parts of delbineol, and 5.0 parts of dibutyl phthalate.

In Examples 8 to 10, glass and an oxide selected from praseodymium oxide, samarium oxide, lanthanum oxide, and neodymium oxide were placed in a platinum crucible, heated to the melting temperature of the glass, and then rapidly cooled. The powder was further finely ground and mixed with ruthenium oxide and an organic vehicle to form a resistance paint. In Example 7, only the crow and neodymium oxide were treated in the same manner and mixed with other components.

The resistor obtained in this way was placed on an alumina substrate with terminals 11 made of AP, P(X type 1j7 film conductors).
After clean printing a pattern h of mm X1 moe, it was dried, and then baked in a belt furnace at a peak temperature of 850° C. for 10 minutes.

Resistance value, TOJ noise, VC,
R' (5 measurements were taken, and the 0 resistance values shown in Table 1 as well as the results were measured using a digital multimeter manufactured by Takeda Riken Kogyo Co., Ltd.
TR-6855), and converted into a sheet resistance of 12μ thick, which is 7λ. TCR is -25゛C~+1
0 noise liQ, uan- measured in a temperature range of 25°C
'I'ech Re5istor Noise Te5
t (MODEL-2156). The smaller the noise value, the better. VCR is General,
Radio.

Megohm Bridge (Mod, e'l-
10~.1644A). It was measured in a range of 100V. Similar to V CRid T CR, the closer it is to 0, the better.

(hereinafter ♀white) Example 1.2 and Comparative Example 1, Example 3.4 and Comparative Example 2.3
A comparison of the resistors obtained by the present invention shows that the TOR of the resistor obtained by the present invention is improved compared to a conventional resistor having the same resistance value.

Furthermore, it is also excellent in terms of noise and vCR. Further, when comparing the materials having the same blending ratio of ruthenium oxide and glass, it can be seen that the addition of the oxide of the present invention increases the resistance value without deteriorating the noise and vCR.

Thus, the present invention provides praseodymium oxide and/or zamarium oxide, or combination thereof with lanthanum oxide and/or
Alternatively, by adding neodymium oxide to a ruthenium oxide glass resistor, it is possible to improve TCR in the high resistance range and bring it closer to O, and also improve noise and VCR, which is extremely excellent in practical use. It is.

% measurement applicant Shoei Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1 (a) Ruthenium oxide, (b) glass, (C
) Resistance generation consisting of 7'77ozym oxide and/or samarium oxide and (d,) organic vehicle 1°2 (a) Ruthenium oxide, (b) glass, (C
) Braseosite oxide and/or samarium oxide;
(d) lanthanum oxide and 7/' or i-ozyme oxide; (e) ruthenium oxide on a 1°6 insulating base 4 of a W machine vehicle; (b
) A resistor formed by forming a resistive coating made of glass and (C) praseodymium oxide and/or samarium oxide. 4. A resistive coating consisting of (a) ruthenium oxide, (b) glass, (C) praseodymium oxide and/or samarium oxide, and (d) lanthanum oxide and/or neodymium oxide on an insulating substrate. A resistor formed by forming.