JPH10270207A - Multiple laminated thermistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple laminator thermistor, the sensitivity of which becomes constant in a wide temperature range (>=100 deg.C). SOLUTION: A multiple laminated thermistor is formed by applying a paste to an external electrode to the end face of a sintered body obtained by laminating thermistor layers 3 which is composed of a transition metal oxide on which internal electrodes 1a, 1b, and 1c are printed, so that two thermistors can be incorporated upon another and baking the laminated body such that external electrodes 2a, 2b, and 2c are electrically connected respectively to the internal electrodes 1a, 1b, and 1c and baking the electrode paste. The external electrode 2a is provided as the common external electrode of the two thermistors, and the two thermistors having different resistance values are constituted between the external electrodes 2a and 2b and between the external electrodes 2a and 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layer type thermistor used for a temperature sensor of information equipment, communication equipment, home electric equipment, housing equipment, automobile equipment and the like.

[0002]

2. Description of the Related Art In recent years, information equipment, communication equipment, home electric appliances,
2. Description of the Related Art There is an increasing demand for detecting the temperature of an electronic component having a temperature characteristic or the vicinity of an electronic component by using a thermistor in a housing device, an automobile device, or the like, and compensating for the temperature characteristic.

Conventionally, temperature detection by a thermistor is shown in FIG.
The circuit configuration shown in FIG. In FIG. 18, 11 is a thermistor, and 12 is a fixed resistor connected in series to the thermistor. Input terminal 13, ground terminal 15
When a constant DC voltage is applied during this period, a voltage corresponding to the temperature of the thermistor appears at the output terminal 14. The thermistor used here is a laminated thermistor shown in FIGS. 19 and 20, wherein 1a and 1b are internal electrodes, 2a and 2b are external electrodes, and 3 is a thermistor sintered body.

[0004]

According to the above configuration, in the operating temperature range of general equipment of -20 ° C to 80 ° C,
As shown in FIG. 17, ΔV / ΔT (sensitivity) differs depending on the temperature, and there is a problem that it is difficult to accurately detect the temperature.

[0005] Therefore, the present invention provides a wide temperature range (100 ° C).
It is an object of the present invention to provide a multi-layered thermistor that can easily constitute an electronic circuit having a constant ΔV / ΔT (sensitivity).

[0006]

In order to achieve this object, a multi-layer laminated thermistor according to the present invention comprises: a laminated body in which a plurality of thermistor layers and a plurality of internal electrode layers are alternately laminated; At least three external electrodes provided on an exposed end face of the internal electrode and electrically connected to the internal electrode, and achieve the above object by having a plurality of thermistor functions. Can be.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a laminate in which a plurality of thermistor layers and a plurality of internal electrode layers are alternately laminated, and an exposed end face of the internal electrode of the laminate. And a multilayer laminated thermistor having at least three external electrodes provided so as to be electrically connected to the internal electrodes, and having a plurality of thermistor functions, thereby achieving good sensitivity over a wide temperature range. An electronic circuit that maintains a constant value can be easily configured.

According to a second aspect of the present invention, there is provided the multiple stacked thermistor according to the first aspect, wherein resistance values between the internal electrodes are different from each other. Thus, it is possible to easily configure an electronic circuit that maintains good sensitivity at a constant level.

According to a third aspect of the present invention, the resistance value between the internal electrodes is such that one resistance value is 1.5 times or more the other resistance value. An electronic circuit which is a thermistor and maintains good sensitivity constant over a wider temperature range can be easily configured.

According to a fourth aspect of the present invention, there is provided the multi-layer type thermistor according to the first aspect, wherein the internal electrode is provided inside the laminate and is not connected to the external electrode. A low resistance can be obtained.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a multiple layered thermistor according to the present embodiment, FIG. 2 is a sectional view taken along line AB, and FIG. An external electrode 2a is formed on the end face of the sintered body obtained by laminating and firing a transition metal oxide having the internal electrodes 1a, 1b and 1c printed in a predetermined shape so that the internal electrode 1a and the external electrode can be formed. 2b is formed by applying and baking an external electrode paste so as to be electrically connected to the internal electrode 1b and the external electrode 2c, respectively. External electrode 2
a is a common external electrode of the two thermistors,
Two thermistors having different resistance values are formed between the external electrodes 2a and 2b and between the external electrodes 2a and 2c.

Internal electrode 1 connected to external electrodes 2b and 2c
internal electrode 1a to minimize the effect between b and 1c.
Are preferably arranged so as to be interposed therebetween.

FIG. 16 shows a circuit of a temperature sensor using the multi-layered thermistor of the present invention, in which ΔV / ΔT (sensitivity) becomes constant over a wide temperature range (100 ° C. or higher) which can be practically used. is there. 25 is an input terminal, 23 and 24
Is a fixed resistor, 21 and 22 are thermistors, 26 is a ground terminal, and 27 is an output terminal.

(Embodiment 2) FIG. 4 shows a multiple layered thermistor according to the present embodiment. FIG. 5 is a sectional view taken along the line AB, FIG. 6 is a sectional view taken along the line CD, and FIG. As shown, the common internal electrode 1a and the external electrode 2a are not provided, and the internal electrodes 1a, 1b, 1c, 1d and the external electrodes 2a, 2b, 2 are not provided.
c and 2d are formed respectively, and external electrodes 2a and 2b are formed.
And two thermistors having different resistance values between the external electrodes 2c and 2d.

(Embodiment 3) FIG. 7 shows a multiple layered thermistor according to the present embodiment. FIG. 8 is a sectional view taken along the line AB, FIG. 9 is a sectional view taken along the line CD, and the internal electrode 1a. , 1
As shown in FIG. 1, the internal electrodes 1a, 1b, 1c are not provided with the common electrodes b, 1c and the external electrodes 2a, 2b, 2c. , 2c and the external electrodes 2
a, 2b and the external electrodes 2a, 2c having different resistance values.
Thermistors are configured.

As described above, the three external electrodes 2a, 2b, 2
c are provided on different end faces, thereby enabling the internal electrodes 1b, 1
The influence between c is almost negligible, and a smaller one can be obtained than the multiple stacked thermistor shown in FIGS.

(Embodiment 4) FIG. 10 shows a multi-layer laminated thermistor according to this embodiment, and FIG.
FIG. 12 is a cross-sectional view taken along the line CD in FIG. 12, and in order to obtain a thermistor having a low resistance value, in the multiple stacked thermistor of FIG.
e. A plurality of internal electrodes for lowering the resistance may be formed.

(Embodiment 5) FIG. 13 shows a multi-layered thermistor according to this embodiment, and FIG.
FIG. 15 is a cross-sectional view taken along the line CD in FIG. 15, and in order to obtain a thermistor having a low capacitance, external electrodes 2a and 2b are provided inside the multilayer body in each thermistor function part of the multiple stacked thermistor of FIG. , 2c not connected to internal electrode 1
f, 1 g.

In the first to fifth embodiments, the resistance value of the two thermistors is set such that one resistance value is 1.5 times or more the other resistance value, so that ΔV / ΔT (sensitivity) can be kept constant over a wide temperature range. This resistance value can be freely set by selecting the material of the thermistor, the overlapping area of the internal electrodes, and the distance.

As shown in FIG. 17, the temperature sensor using the multiple stacked thermistor of the present invention has a constant ΔV / ΔT (sensitivity) between -20 ° C. and 80 ° C. It has twice the sensitivity.

Although only the case where two thermistors are formed in one laminated thermistor has been described, three or more thermistors can be formed in the same manner.

[0022]

As described above, the multi-layer type thermistor of the present invention forms a temperature sensor circuit having a constant sensitivity and a sensitivity twice as high as that of a semiconductor temperature sensor between -20 ° C and 80 ° C. be able to. This temperature sensor circuit can be obtained with a small number of components such as one multi-layer laminated thermistor and three fixed resistors, which is effective for miniaturization of equipment and reduces mounting area and mounting cost. Can be.

[Brief description of the drawings]

FIG. 1 is a top view of a multiple stack thermistor according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view taken along a line AB in FIG.

FIG. 3 is a sectional view taken along line CD of FIG. 1;

FIG. 4 is a top view of a multiple-layer laminated thermistor according to Embodiment 2 of the present invention.

FIG. 5 is a sectional view taken along a line AB in FIG. 4;

FIG. 6 is a sectional view taken along line CD of FIG. 4;

FIG. 7 is a top view of a multiple-layer laminated thermistor according to Embodiment 3 of the present invention.

8 is a sectional view taken along a line AB in FIG. 7;

FIG. 9 is a sectional view taken along line CD of FIG. 7;

FIG. 10 is a top view of a multiple-layer laminated thermistor according to Embodiment 4 of the present invention.

11 is a sectional view taken along a line AB in FIG.

12 is a sectional view taken along line CD of FIG.

FIG. 13 is a top view of the multiple-layer laminated thermistor according to the fifth embodiment of the present invention.

14 is a cross-sectional view taken along a line AB in FIG.

FIG. 15 is a sectional view taken along line CD of FIG. 13;

FIG. 16 is a circuit diagram of a temperature sensor using the multiple stacked thermistor of the present invention.

17 is a characteristic curve diagram of a temperature sensor voltage (V) -temperature (T) in FIG.

FIG. 18 is a circuit diagram of a conventional temperature sensor.

FIG. 19 is a top view of a conventional laminated thermistor.

20 is a sectional view taken along a line AB in FIG. 19;

[Explanation of symbols]

 1a Internal electrode 1b Internal electrode 1c Internal electrode 1d Internal electrode 1e Internal electrode 1f Internal electrode 1g Internal electrode 2a External electrode 2b External electrode 2c External electrode 2d External electrode 3 Thermistor layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kotaro Suzuki 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Takashi Inoue 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A laminate in which a plurality of thermistor layers and a plurality of internal electrode layers are alternately laminated, and provided on an exposed end face of the internal electrode of the laminate and electrically connected to the internal electrode. And a multi-layer laminated thermistor comprising at least three external electrodes. 2. The multiple stacked thermistor according to claim 1, wherein resistance values between the internal electrodes are different from each other. 3. The resistance value between the internal electrodes is such that one resistance value is 1.5 times or more the other resistance value.
2. The multiple layered thermistor according to 1. 4. The multiple layered thermistor according to claim 1, wherein an internal electrode that is not connected to the external electrode is provided inside the multilayer body.