JPH08236308A - Ceramic electronic component and adjusting method of characteristic value thereof - Google Patents

Abstract

PURPOSE: To obtain a ceramic electronic component of a small dispersion in characteristic value, while providing a high-precision ceramic electronic component of a small dispersion in electrical characteristics such as a resistance value, by using a simple grinding method, which enables mass treatment, such as barrel polishing and a characteristic-value adjusting method thereof. CONSTITUTION: In a negative temperature coefficient thermistor 4a, a pair of a first surface electrode 2a and a second surface electrode 2b formed so that each one end may face mutually at an interval are formed on one main surface of a ceramic element assembly 1 having negative resistance temperature characteristics, and a terminal electrode 3a electrically connected at the other end of the first surface electrode 2a and a terminal electrode 3b electrically connected at the other end of the second surface electrode 2b in a pair are shaped at the end sections of the ceramic element assembly 1 having negative resistance temperature characteristics. Parts of the first and second surface electrodes 2a, 2b of the ceramic element assembly 1 having negative resistance temperature characteristics are removed by a barrel polishing method or a sand blasting method, thus adjusting a resistance value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic electronic component and its characteristic value adjusting method.

[0002]

2. Description of the Related Art A ceramic electronic component consists of a ceramic body and terminal electrodes formed at the ends of the ceramic body, or a ceramic body and internal electrodes and internal electrodes formed inside the ceramic body. Some of them consist of terminal electrodes formed at the end of the ceramic body to be connected to, and typical ones are positive characteristic thermistors, negative characteristic thermistors, capacitors, inductors, varistors, fixed resistors, etc. There is.

A negative characteristic thermistor is an example of a ceramic electronic component. FIG. 15 is a perspective view of the negative characteristic thermistor. As shown in FIG. 15, the negative characteristic thermistor includes a ceramic body 1 and a terminal electrode 3 having negative resistance temperature characteristics.
It consists of a and 3b.

16 and 17 are sectional views taken along the line FF of the negative characteristic thermistor of FIG. 15, respectively. The negative characteristic thermistor 40 shown in FIG. 16 is of a type in which the internal electrode is not formed inside the ceramic body 1 having the negative resistance temperature characteristic, and the negative characteristic thermistor 41 shown in FIG. It is of a type in which internal electrodes 5a and 5b are formed. Then, the negative characteristic thermistor 4 shown in FIG.
In No. 1, internal electrodes 5a and 5b are formed inside the ceramic body 1 having a negative resistance temperature characteristic, and the internal electrodes 5a and 5b are electrically connected to the terminal electrodes 3a and 3b.

FIG. 18 is an exploded plan view for explaining the method of manufacturing the negative characteristic thermistor 41. As shown in FIG. 18, the conductor patterns 7p and 8 to be the internal electrodes 5a and 5b are formed.
On the ceramic green sheet 6p having p formed thereon, a ceramic green sheet 6c which is a dummy sheet having no conductor pattern formed thereon is laminated, integrally pressed and fired. A negative characteristic thermistor 41 is obtained by applying the conductive paste, which will be the terminal electrodes 3a and 3b shown in FIG. 17, to the end portions of the obtained sintered body and baking it.

These negative characteristic thermistors 40 and 41 are
It is used for temperature compensation and temperature detection, but particularly in the case of temperature detection, it is necessary to reduce the resistance value variation (narrow deviation) in order to improve the detection accuracy.

The resistance value of the negative characteristic thermistor 40 shown in FIG. 16 is mainly the distance L14 between the terminal electrodes 3a and 3b, the dimension of the thickness t12 of the ceramic body 1 having a negative resistance temperature characteristic, and also shown in FIG. In the negative characteristic thermistor 41, the distance L15 between the terminal electrodes 3a and 3b and the internal electrodes 5a and 5b are mainly used.
The distance L16, the thickness t13 of the ceramic body 1 having a negative resistance temperature characteristic, the terminal electrodes 3a and 3b and the internal electrodes 5a and 5b.
Is determined by the distances t14 and t15 in the thickness direction of the ceramic body 1 having the negative resistance temperature characteristic.

Therefore, in the negative characteristic thermistor 40, the distance L14 between the terminal electrodes 3a and 3b influences the resistance value more strongly than the thickness t12 of the ceramic body 1 having the negative resistance temperature characteristic, and the distance between the terminal electrodes 3a and 3b. The variation of the distance L14 also affects the variation of the resistance value.

Further, in the negative characteristic thermistor 41, since the distance L15 between the terminal electrodes 3a and 3b is longer than the distance L16 between the internal electrodes 5a and 5b, the variation of L15 is less problematic than the variation of L16. The distance L16 between the internal electrodes 5a and 5b is the thickness t13 of the ceramic body 1 having a negative resistance temperature characteristic and the thickness t between the electrodes due to the high precision of the printing technique.
Since 14 and t15 can be made relatively accurately by the sheet method, a resistance value variation smaller than that of the negative characteristic thermistor 40 can be obtained, but it is not at a level satisfying the recent demand for high precision products. .

Moreover, since the distances L14 and L15 between the terminal electrodes 3a and 3b of the negative characteristic thermistors 40 and 41 are affected by the viscosity of the electrode material and the like, it is difficult to make the dimensional accuracy variation smaller than it is. However, the precision of the resistance value could not be improved.

Therefore, as a method for adjusting the resistance value with high accuracy, an atmosphere heat treatment method, a laser trimming method, a barrel polishing method, etc. are used.

[0012]

Among these, when adjusting the resistance value by the atmosphere heat treatment method, it is difficult to control the atmosphere because a large amount of negative characteristic thermistors are heat-treated in a lump, and in the heat treatment furnace. Since the gas distribution is not uniform, the variation (shift) in the overall resistance value is large, and it is difficult to achieve high precision (narrow deviation).

When the resistance value is adjusted by the laser trimming method, the ceramic body 1 and the terminal electrodes 3a and 3b having a negative resistance temperature characteristic are trimmed by laser irradiation. Since this method determines the trimming amount while measuring the resistance value of each one, it can be performed relatively easily and accurately. However, depending on the ceramic body 1 having a negative resistance temperature characteristic, the temperature of itself may be changed by laser irradiation. It was difficult to accurately obtain the resistance value at room temperature. Moreover, it takes time to adjust each one,
This led to an increase in costs.

Further, when the resistance value is adjusted by shaving the ceramic body 1 having a negative resistance temperature characteristic by barrel polishing, a large amount of processing can be performed easily, but it has a negative resistance temperature characteristic. Since the ceramic body 1 itself was scraped, it was not easy to make fine adjustments.

Moreover, in barrel polishing, while scraping the ceramic body 1 having a negative resistance temperature characteristic, the terminal electrode 3
Since a and 3b are also shaved at the same time, a hard material is used as the electrode material or the electrode thickness is increased so that the terminal electrodes 3a and 3b are less likely to be shaved than the ceramic body 1 having a negative resistance temperature characteristic. There is also a problem that it is necessary to consider it, and there are restrictions when putting it to practical use.

An object of the present invention is to obtain a ceramic electronic component having a small variation in characteristic values, and by using a grinding method such as barrel polishing which can perform a large amount of processing easily, a highly accurate variation in electrical characteristics such as a resistance value is small. To provide a ceramic electronic component and its characteristic value adjusting method.

[0017]

The invention according to claim 1 is
Of the ceramic body, a pair of first and second surface electrodes formed on one main surface of the ceramic body so as to face each other at intervals, and the first and second surface electrodes. A ceramic electronic component that is electrically connected to the other end and that includes a pair of terminal electrodes formed at the end of the ceramic body.

According to a second aspect of the present invention, there is provided a ceramic body, a first surface electrode and a second surface electrode respectively formed on one main surface and the other main surface of the ceramic body, and the first and second front surface electrodes. 2 a pair of terminal electrodes electrically connected to the other end of the surface element and formed at the end of the ceramic element body. One end of the first surface electrode is from one end of the ceramic element body to the other end. The second surface electrode is formed to extend to the
The ceramic electronic component is formed such that one end thereof extends from the other end of the ceramic body to one end.

According to a third aspect of the present invention, a ceramic body and a surface formed on one main surface of the ceramic body so that one end thereof extends from one end of the ceramic body to the other end thereof. An electrode, an internal electrode formed inside the ceramic body so that one end thereof extends from the other end of the ceramic body to one end, and formed on one end of the ceramic body One terminal electrode electrically connected to one end of the electrode, and the other terminal electrode formed at the other end of the ceramic body and electrically connected to one end of the internal electrode,
Is a ceramic electronic component.

According to a fourth aspect of the present invention, the ceramic body and one main surface and the other main surface of the ceramic body have one end extending from one end of the ceramic body to the other end. A first surface electrode and a second surface electrode respectively formed on the
A surface electrode, an internal electrode formed inside the ceramic body so that one end thereof extends from the other end of the ceramic body to one end, and the other end of each of the first and second surface electrodes. A ceramic electronic device including one terminal electrode electrically connected and formed at the end of the ceramic body, and the other terminal electrode electrically connected to the other end of the internal electrode and formed at the end of the ceramic body. It is a part.

According to a fifth aspect of the present invention, the ceramic body and the one main surface and the other main surface of the ceramic body have one end extending from one end of the ceramic body to the other end. A first surface electrode and a second surface electrode respectively formed on the
A surface electrode; a plurality of layers of internal electrodes formed inside the ceramic body such that one end thereof extends from the other end of the ceramic body to the other end; From one terminal electrode electrically connected to the other end and formed at the end of the ceramic body, and the other terminal electrode electrically connected to the other end of the internal electrode and formed at the end of the ceramic body It is a ceramic electronic component.

The invention according to claim 6 is a ceramic electronic component, wherein the surface electrode has a hardness smaller than that of the ceramic body.

The invention according to claim 7 is a ceramic electronic component, wherein the surface electrode has a sharp tip.

In the invention according to claim 8, the ceramic body is any one of a positive characteristic thermistor body, a negative characteristic thermistor body, a capacitor body, an inductor body, a varistor body, and a fixed resistance body, or these. It is a ceramic electronic component that is a composite of.

A ninth aspect of the present invention is directed to the ceramic electronic component according to any one of the first to eighth aspects, and is a method for adjusting the characteristic value of the ceramic electronic component in which a part of the surface electrode is removed.

A tenth aspect of the present invention is directed to the ceramic electronic component according to any one of the first to eighth aspects, in which a part of the surface electrode is removed by a barrel polishing method or a sandblasting method. This is a characteristic value adjustment method.

[0027]

According to the ceramic electronic component of the present invention, a surface electrode and / or an internal electrode is provided on the ceramic element body, and a structure capable of removing a part of the surface electrode is used to cut a part of the surface electrode. The distance between the surface electrodes or the distance between the surface electrodes and the internal electrodes can be adjusted to obtain ceramic electronic parts with various characteristic values, and ceramic electronic parts with small variations can be obtained, making it easy to improve the accuracy of the characteristic values. can do.

Further, according to the characteristic value adjusting method for a ceramic electronic component of the present invention, a large amount of characteristic value can be easily adjusted by cutting a part of the surface electrode. It should be noted that the characteristic value here means that the positive characteristic thermistor, the negative characteristic thermistor, the varistor, and the fixed resistor are intended for the resistance value. It also means that the capacitance value is targeted for the capacitor. Further, it means that the inductor is targeted for the inductance value.

[0029]

Embodiments of the ceramic electronic component according to the present invention will be described below with reference to the drawings. The parts corresponding to those of the above-mentioned conventional technique will be described with the same reference numerals.

FIG. 1 is a perspective view showing a negative characteristic thermistor as an example of the ceramic electronic component according to the first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG.

The negative characteristic thermistor 4a has a pair of first surface electrodes 2a formed on one main surface of the ceramic body 1 having a negative resistance temperature characteristic so that one ends thereof face each other with a gap. The second surface electrode 2b is formed, and at the end of the ceramic body 1 having a negative resistance temperature characteristic, a terminal electrode 3a and a second surface electrode 2b electrically connected to the other end of the first surface electrode 2a are formed. Terminal electrode 3b electrically connected to the other end
Forming a pair.

More specifically, the ceramic body 1 having a negative resistance temperature characteristic is composed of manganese oxide, nickel oxide,
Cobalt oxide, iron oxide, copper oxide and the like are mixed in a predetermined ratio, calcined, calcined, crushed, molded and fired. A conductive paste of Ag-Pd to be surface electrodes 2a and 2b is applied to one main surface of the obtained ceramic body 1 having a negative resistance temperature characteristic, and further electrically connected to the surface electrodes 2a and 2b. The negative characteristic thermistor 4a is obtained by applying a conductive paste such as Ag to be the terminal electrodes 3a and 3b to both ends of the ceramic body 1 having a negative resistance temperature characteristic and baking it. The ceramic body 1 having a negative resistance temperature characteristic may be manufactured using a ceramic green sheet.

FIG. 3 is a perspective view of a negative characteristic thermistor as an example of the ceramic electronic component according to the second embodiment, and FIG. 4 is a sectional view taken along line BB of FIG.

The negative characteristic thermistor 4b includes a first surface electrode 2a and a second surface electrode 2b which are formed on one main surface and the other main surface of the ceramic body 1 having a negative resistance temperature characteristic, respectively. A pair of terminal electrodes 3a, 3 electrically connected to the other ends of the surface electrode 2a and the second surface electrode 2b and formed at the end of the ceramic body 1 having negative resistance temperature characteristics.
b.

The first surface electrode 2a is formed so that one end thereof extends from one end of the ceramic body 1 having a negative resistance temperature characteristic to the other end, and the second surface electrode 2b has one end thereof. Are formed so as to extend from the other end of the ceramic body 1 having a negative resistance temperature characteristic to the one end. The negative characteristic thermistor 4b shown in FIGS. 3 and 4
Can be obtained with the same material and manufacturing method as in the first embodiment.

FIG. 5 is a perspective view showing a negative characteristic thermistor as an example of the ceramic electronic component according to the third embodiment, FIG. 6 is a sectional view taken along the line CC of FIG. 5, and FIG. D-
It is sectional drawing of a D line.

The negative characteristic thermistor 4c is provided on one main surface of the ceramic body 1 having negative resistance temperature characteristics, and one end of the ceramic body 1 has negative resistance temperature characteristics from one end to the other end. Inside the ceramic body 1 having the negative resistance temperature characteristic and the surface electrode 2a formed so as to extend to the other part, one end of the ceramic body 1 having the negative resistance temperature characteristic from the other end. The internal electrode 5b is formed so as to extend to the end.

Then, one terminal electrode 3a electrically connected to one end of the surface electrode 2a is connected to one end of the ceramic element body 1 having the negative resistance temperature characteristic and the ceramic element body having the negative resistance temperature characteristic. At the other end of the body 1, the internal electrode 5
The other terminal electrode 3b electrically connected to one end of b is formed.

FIG. 8 is an exploded plan view for explaining the method of manufacturing the negative characteristic thermistor 4c. Mn-Ni-Co
-Ceramic green sheets 6a, 6b made of Fe
6c is prepared as follows. That is, the ceramic green sheets 6a, 6b and 6c are formed from a slurry obtained by adding a binder and a solvent to the ceramic powder and mixing them.

Conductor patterns 7a and 8b serving as the surface electrode 2a and the internal electrode 5b are formed on the ceramic green sheets 6a and 6b, respectively. These conductor patterns 7a and 8b are formed by printing with a paste containing Ag-Pd as a main component. The conductor patterns 7a and 8b are merely examples, and the shapes are not limited to those shown in the drawing.

The ceramic green sheets 6a, 6b, 6c having the above-mentioned pattern are laminated in the order of arrows, and 1
It is pressure-bonded at a pressure of 000 kg / cm ² , cut into a predetermined size, for example, the shape after firing is 4.5 × 3.2 × 1.2 mm, and fired at 1000 ° C. for 2 hours, and the negative The ceramic body 1 having the resistance temperature characteristic of is obtained.

On the ceramic body 1 having the negative resistance-temperature characteristic, the terminal electrodes 3a and 3b are formed by the same method as in the first embodiment.
And the negative characteristic thermistor 4c is obtained. The resistance value can be changed by stacking an arbitrary number of dummy ceramic green sheets 6c between the ceramic green sheets 6a and 6b.

FIG. 9 is a perspective view showing a negative characteristic thermistor as an example of the ceramic electronic component according to the fourth embodiment, and FIG. 10 is a sectional view taken along the line EE of FIG.

The negative characteristic thermistor 4d has one end on one main surface and the other main surface of the ceramic body 1 having negative resistance temperature characteristics, and one end of the ceramic body 1 having negative resistance temperature characteristics. Surface electrode 2a and second surface electrode 2c formed so as to extend from one part to the other end
And an internal electrode formed inside the ceramic body 1 having negative resistance temperature characteristics so that one end thereof extends from the other end to one end of the ceramic body 1 having negative resistance temperature characteristics. 5b and.

Then, one terminal electrode 3a is electrically connected to the other ends of the first surface electrode 2a and the second surface electrode 2c, and one terminal electrode 3a is connected to the internal electrode at the end of the ceramic body 1 having negative resistance temperature characteristics. 2b is electrically connected to the other end of the ceramic body 1 and has the other terminal electrode 3b at the end of the ceramic body 1 having a negative resistance temperature characteristic.
Are formed.

FIG. 11 is an exploded plan view for explaining the method of manufacturing the negative characteristic thermistor 4d. Similar to the manufacturing method shown in the third embodiment, the ceramic green sheet 6 is used.
a and 6b are prepared, laminated and fired in the order of the arrow in FIG. 11 to obtain the ceramic body 1 having a negative resistance temperature characteristic.
The negative characteristic thermistor 4d is obtained by forming the terminal electrodes 3a and 3b on the end portion of the ceramic body 1 having the negative resistance temperature characteristic by the same method as in the third embodiment.

Although the dummy ceramic green sheets 6c shown in FIG. 8 in the third embodiment are not shown in FIG. 11, an arbitrary number of ceramic green sheets 6c are provided between the ceramic green sheets 6a and 6b. The resistance value can be changed by stacking the layers.

FIG. 12 is a sectional view of the fifth embodiment, which is a negative characteristic thermistor as an example of a ceramic electronic component. The negative characteristic thermistor 4e has the same external appearance as the negative characteristic thermistor 4d, and is a perspective view. The figure is omitted, and a cross-sectional view corresponding to the line EE of FIG. 9 is shown.

The negative characteristic thermistor 4e has one end on one main surface and the other main surface of the ceramic body 1 having negative resistance temperature characteristics, and one end of the ceramic body 1 having negative resistance temperature characteristics. Surface electrode 2a and second surface electrode 2c formed so as to extend from one part to the other end
And inside the ceramic body 1 having the negative resistance temperature characteristic, one end thereof is formed to extend from the other end to one end of the ceramic body 1 having the negative resistance temperature characteristic. It is composed of internal electrodes 5b and 5c.

Then, one terminal electrode 3a is electrically connected to the other ends of the first surface electrode 2a and the second surface electrode 2c, and one terminal electrode 3a is connected to the internal electrode at the end of the ceramic body 1 having a negative resistance temperature characteristic. The other terminal electrode 3b is formed at the end of the ceramic body 1 which is electrically connected to the other ends of 5b and 5c and has a negative resistance temperature characteristic.

FIG. 13 is an exploded plan view for explaining the method of manufacturing the negative characteristic thermistor 4e. Similar to the manufacturing method shown in the third embodiment, the ceramic green sheet 6 is used.
a and 6b are prepared and laminated in the order of arrows shown in FIG.
It is fired to obtain a ceramic body 1 having a negative resistance temperature characteristic. Ceramic body 1 having this negative resistance temperature characteristic
In the same manner as in the third embodiment, the terminal electrodes 3a and 3b are attached to the end portions of
By forming the, the negative characteristic thermistor 4e is obtained.

Although the dummy ceramic green sheets 6c shown in FIG. 8 in the third embodiment are not shown in FIG. 13, an arbitrary number of ceramic green sheets 6c are provided between the ceramic green sheets 6a and 6b. The resistance value can be changed by stacking the layers.

Next, a method of adjusting the resistance value of the ceramic electronic component obtained in each of the above embodiments will be described. This resistance value adjustment is a method of removing a part of the surface electrode by a barrel polishing method or a sandblast method.

In the case of the first embodiment, the negative characteristic thermistor 4 is used.
By subjecting a to a barrel polishing method or a sandblasting method, and cutting the surface electrodes 2a and 2b including the tip portions,
The distance L2 between the surface electrodes 2a and 2b changes, and the resistance value is adjusted. At this time, there is a case where a part of the ceramic body 1 having the negative resistance temperature characteristic is scraped, and in this case, it partially contributes to the adjustment of the resistance value.

In the case of the second embodiment, the negative characteristic thermistor 4 is used.
By subjecting b to a barrel polishing method or a sandblasting method, and cutting the tip portions of the surface electrodes 2a and 2b,
The distance L4 between both surface electrodes 2a, 2b and the surface electrodes 2a, 2
The distance L3 between b and the terminal electrodes 3b and 3a changes, and the resistance value is adjusted. At this time, there is a case where a part of the ceramic body 1 having the negative resistance temperature characteristic is scraped, and in this case, it partially contributes to the adjustment of the resistance value.

In the case of the third embodiment, the negative characteristic thermistor 4 is used.
By subjecting c to a barrel polishing method or a sandblasting method, and cutting the surface electrode 2a including the tip portion, the distance L6 between the surface electrode 2a and the terminal electrode 3b and the distance L7 between the surface electrode 2a and the internal electrode 5b are changed, The resistance value is adjusted.
At this time, there is a case where a part of the ceramic body 1 having the negative resistance temperature characteristic is scraped, and in this case, it partially contributes to the adjustment of the resistance value.

In the case of the fourth embodiment, the negative characteristic thermistor 4 is used.
By subjecting d to a barrel polishing method or a sand blasting method, and cutting the surface electrodes 2a and 2c including the tips thereof,
The distance L10 between the surface electrodes 2a and 2c and the terminal electrode 3b and the distance L11 between the surface electrodes 2a and 2c and the internal electrode 5b are changed to adjust the resistance value. At this time, there is a case where a part of the ceramic body 1 having the negative resistance temperature characteristic is scraped, and in this case, it partially contributes to the adjustment of the resistance value.

In the case of the fifth embodiment, the negative characteristic thermistor 4 is used.
By subjecting e to a barrel polishing method or a sandblasting method, and cutting the surface electrodes 2a and 2c including the tip portions,
The distance L12 between the surface electrodes 2a and 2c and the terminal electrode 3b and the distance L13 between the surface electrodes 2a and 2c and the internal electrodes 5b and 5c are changed to adjust the resistance value. At this time, there is a case where a part of the ceramic body 1 having the negative resistance temperature characteristic is scraped, and in this case, it partially contributes to the adjustment of the resistance value.

In order to adjust the resistance value, it is generally easier and more effective to grind a surface electrode that is softer than ceramic, rather than grind hard ceramic. For this reason, the shape of the surface electrode may be made to have an acute-angled portion or the like at the tip by grinding such as barrel polishing so that the shape of the electrode is easily changed.

For example, in FIGS. 14 (a) to 14 (l),
It is a top view which shows surface electrodes 7d-7o and 8d-8o of other shapes instead of surface electrodes 2a and 2b shown in FIG. In addition, instead of the surface electrodes 2a and 2b shown in FIGS. 3 to 7, FIG. 9, FIG. 10 and FIG.
You may form o, 8d-8o.

The shapes of the surface electrodes 7d to 7o and 8d to 8o are used in combination depending on the resistance value and application. For example, in FIG.
14B, FIG. 14D to FIG. 14F, conductor patterns 7d, 7e, 7g to 7i, conductor patterns 8d, 8e,
By sharpening the tip of 8g to 8i, the tip is easily scraped. 14 (g) to 14 (l), the electrode widths of the conductor patterns 7j to 7o and the conductor patterns 8j to 8o are narrow, so that they are easily scraped.

The terminal electrodes 3a and 3b are the surface electrodes 2
It is preferable to provide the electrodes a, 2b, 2c and the internal electrodes 5b, 5c smaller than the base portions because the influence of the resistance value variation due to the terminal electrodes 3a, 3b can be reduced. In addition, the surface electrodes 2a, 2
b, 2c and the internal electrodes 5b, 5c are preferably formed so as not to overlap in the thickness direction, and the dimension in the thickness direction of the conductor portion is not limited by factors such as withstand voltage and the like. It is good because it can be used to control the adjustment ability of the resistance value.

In the ceramic electronic components 4a, 4c of the first and third embodiments, the surface electrodes 2a, 2 are provided only on one main surface of the ceramic body 1 having a negative resistance temperature characteristic.
Since b is provided, it also has an advantage that a short circuit phenomenon due to a solder bridge does not occur when it is mounted on a wiring board.

Further, the ceramic body having the above-mentioned negative resistance temperature characteristic is not limited to manganese, nickel, cobalt, copper and iron, but a ceramic showing a negative resistance temperature characteristic, for example, BaTiO ₃ and Li ₂ O _{3 can be used.} With the addition of
A lanthanum cobalt-based oxide or the like may be used as an example of the rare earth element-based oxide.

In addition to the above negative characteristic thermistor, a dielectric,
By using a ceramic material such as a magnetic substance, a resistor, a varistor, and a positive temperature coefficient thermistor, it can be applied to a ceramic electronic component such as a capacitor, an inductor, a resistor, a varistor, and a positive temperature coefficient thermistor. Further, the ceramic electronic component is not limited to the configuration having only the negative characteristic thermistor, and can be applied to, for example, a composite electronic component in which the negative characteristic thermistor and the positive characteristic thermistor are integrated.

The shape of the ceramic electronic component is not particularly limited, and is not limited to the rectangular plate shape shown in the embodiment, and may be a plate shape having at least a pair of parallel surfaces such as a disk shape.

Materials for the electrodes include Ag, Ag-Pd,
Cu, Ni or alloys thereof may be used. In addition, the method of forming the electrodes includes plating, coating, vapor deposition, sputtering, etc., or forming a conductive paste to be an electrode on an unfired ceramic body, and forming the electrodes at the same time when firing the ceramic body. good.

[0068]

According to the ceramic electronic component of the present invention, since it has a structure in which a surface electrode or a surface electrode and an internal electrode are formed, the resistance can be varied by changing the distance between the surface electrodes or the distance between the surface electrode and the internal electrode. You can change the value.

By providing a surface electrode on one main surface or both main surfaces of the ceramic and removing a part of the surface electrode, the characteristic value can be easily adjusted. Since the tip is sharpened or thinned, the characteristic value can be adjusted with high accuracy by a grinding method such as a barrel polishing method or a sandblast method.

According to the characteristic value adjusting method of the ceramic electronic component of the present invention, the characteristic value can be adjusted by a simple method of removing a part of the surface electrode. Moreover, a large amount of processing can be performed by a method such as a barrel polishing method or a sandblast method, and the characteristic value can be adjusted with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view of a ceramic electronic component according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 of the ceramic electronic component of the first embodiment of the present invention.

FIG. 3 is a perspective view of a ceramic electronic component according to a second embodiment of the present invention.

FIG. 4 is a sectional view of the ceramic electronic component of the second embodiment of the present invention taken along the line BB in FIG.

FIG. 5 is a perspective view of a ceramic electronic component according to a third embodiment of the present invention.

FIG. 6 is a sectional view taken along line CC of FIG. 5 of the ceramic electronic component of the third embodiment of the present invention.

FIG. 7 is a cross-sectional view of the ceramic electronic component of the third embodiment of the present invention taken along the line DD in FIG.

FIG. 8 is an exploded plan view for explaining the method for manufacturing the ceramic electronic component of the third embodiment of the present invention.

FIG. 9 is a perspective view of a ceramic electronic component according to a fourth embodiment of the present invention.

FIG. 10 is a sectional view taken along line EE of FIG. 9 of the ceramic electronic component of the fourth embodiment of the present invention.

FIG. 11 is an exploded plan view for explaining the method for manufacturing the ceramic electronic component of the fourth embodiment of the present invention.

FIG. 12 is a sectional view of a ceramic electronic component of a fifth embodiment of the present invention.

FIG. 13 is an exploded plan view for explaining the method for manufacturing the ceramic electronic component of the fifth embodiment of the present invention.

FIG. 14 is a plan view showing a surface electrode having another shape.

FIG. 15 is a perspective view of a conventional ceramic electronic component.

16 is a conventional ceramic electronic component FF of FIG.
It is sectional drawing of a line.

FIG. 17 is another conventional ceramic electronic component F of FIG.
It is a sectional view of the -F line.

FIG. 18 is an exploded plan view showing another method for manufacturing another conventional ceramic electronic component.

[Explanation of symbols]

1 Ceramic body having negative resistance temperature characteristics 2a First surface electrode 2b, 2c Second surface electrode 3a, 3b Terminal electrode 4a, 4b, 4c, 4d, 4e Negative characteristic thermistor 5b, 5c Internal electrode L1 to L13 Between electrodes Distance t1 to t11 Distance between each electrode in the thickness direction

Claims (10)

[Claims] 1. A ceramic element body, and a pair of first and second pairs formed on one main surface of the ceramic element body so that one ends of the ceramic element bodies face each other at intervals.
A ceramic electronic component comprising a surface electrode and a pair of terminal electrodes electrically connected to the other end of each of the first and second surface electrodes and formed at an end of the ceramic body. 2. A ceramic body, a first surface electrode and a second surface electrode respectively formed on one main surface and the other main surface of the ceramic body, and each of the first and second surface electrodes. The first surface electrode is electrically connected to the other end and is formed of a pair of terminal electrodes formed at an end portion of the ceramic body, and the first surface electrode has one end from one end portion to the other end portion of the ceramic body. The second surface electrode is formed to extend from one end to the other end of the ceramic body, and the second surface electrode is formed to extend to the other end. 3. A ceramic body, a surface electrode formed on one main surface of the ceramic body so that one end thereof extends from one end of the ceramic body to the other end thereof. Inside the ceramic body, one end of the internal electrode is formed to extend from the other end of the ceramic body to one end, and the internal electrode is formed at one end of the ceramic body, the surface A ceramic electronic device comprising: one terminal electrode electrically connected to one end of an electrode; and the other terminal electrode formed at the other end of the ceramic body and electrically connected to one end of the internal electrode. parts. 4. A ceramic body, and one main surface and the other main surface of the ceramic body, one end of which extends from one end of the ceramic body to the other end thereof. A first surface electrode and a second surface electrode, an internal electrode formed inside the ceramic body such that one end thereof extends from the other end of the ceramic body to one end thereof; An end portion of the ceramic element body electrically connected to the other ends of the first and second surface electrodes and electrically connected to one terminal electrode formed at the end portion of the ceramic element body and the other end of the internal electrode. And a terminal electrode formed on the other side, and a ceramic electronic component. 5. A ceramic body, and one main surface and the other main surface of the ceramic body, one end of which extends from one end of the ceramic body to the other end thereof. A first surface electrode and a second surface electrode; and a plurality of layers of internal electrodes formed inside the ceramic body such that one end thereof extends from the other end of the ceramic body to one end thereof. , The first and second surface electrodes are electrically connected to the other end, and one terminal electrode formed at the end of the ceramic body is electrically connected to the other end of the internal electrode, and the ceramic body is And the other terminal electrode formed at the end of the ceramic electronic component. 6. The surface electrode has a hardness smaller than that of the ceramic body.
The ceramic electronic component according to claim 5. 7. The surface electrode according to claim 1, wherein a tip of the surface electrode has an acute angle.
The ceramic electronic component according to any one of 1. 8. The ceramic body is any one of a positive characteristic thermistor body, a negative characteristic thermistor body, a capacitor body, an inductor body, a varistor body, and a fixed resistance body,
Or a complex of these.
A ceramic electronic component according to claim 7. 9. A method for adjusting a characteristic value of a ceramic electronic component, which is intended for the ceramic electronic component according to claim 1, wherein a part of the surface electrode is removed. 10. A ceramic electronic component according to claim 1, wherein a part of the surface electrode is removed by barrel polishing or sandblasting. Value adjustment method.