JP3138631B2 - Chip resistor and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a chip resistor having excellent surge characteristics for use in electronic equipment and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, chip resistors have been widely used as resistance elements as electronic devices have become lighter, thinner and smaller, and replacement with leaded carbon film resistors has been actively pursued with surface mounting. Demands for new characteristics such as surge characteristics are also increasing. Generally, a chip resistor has a disadvantage that its resistance value is easily changed when a surge voltage generated by the influence of static electricity, power supply noise, or the like is applied. It is known that the longer the resistor and the wider the resistor, the better. However, in the conventional chip resistor 1, when the resistance value is corrected, as shown in FIG. 6, the width of the rectangular resistor 3 is reduced by the trimming groove 2 processed by the laser trimming method. The change in resistance value due to the surge voltage is further increased by trimming.

[0003]

As described above, in the conventional chip resistor, since the width of the resistor is reduced by the trimming groove when correcting the resistance value, the surge characteristic is further deteriorated. Has a problem. Therefore, the present invention provides a chip resistor formed by forming a resistor meandering three or more turns between a pair of electrodes provided at both ends of a substrate by printing technique, trimming, or a combination of these, and a chip resistor. It is an object of the present invention to make the surge characteristics of the chip resistor easier and better than before by using the manufacturing method.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems . First, in a chip resistor, a substantially rectangular parallelepiped substrate and both ends of the substrate are provided. A pair of electrodes formed on the substrate and a resistor provided between the electrodes, wherein a connection position with the electrodes is substantially diagonal, and grooves provided in a width direction of the substrate have upper and lower ends. And a meandering resistor formed by alternately providing an even number of resistors from the groove.
A pair of grooves, which are substantially the same as the grooves provided in the resistor.
A pair of grooves located at the center are formed by trimming.
On the other hand, the pair of grooves formed by the trimming
The groove part other than the part is formed by screen printing .

Secondly, in the first configuration, the even number is four, and the even number is two.
One groove is formed by trimming and located on the outside
The two grooves are formed by screen printing .

A third method is a method of manufacturing a chip resistor, comprising: a first step of forming a pair of electrodes at both ends of a substrate; and a step of forming a resistor between the electrodes. The connection position with the electrode is substantially diagonal, and the resistor is formed in a substantially meandering shape by screen-printing the grooves provided in the width direction of the substrate in an even number from the upper end and the lower end alternately. a second step, the above resistor, a pair of trimming groove, a trimming groove is substantially symmetrical positions, the
At the position between the grooves formed in the second step, in the direction between the electrodes,
And the number of grooves formed in the second step is equal on both sides.
Third forming a resistor in a meandering shape by forming a location
And a step. Fourth,
In the third configuration, in the second step, a resistor having a meandering shape of the resistor for two turns is formed.
By forming a pair of trimming grooves in the step, the resistor is formed in a meandering shape for four turns, and is formed in the second step.
Trimming formed in the third step between a pair of formed grooves
It is characterized in that the groove is arranged .

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One specific example of an embodiment of the present invention will be described with reference to the drawings. A first specific example will be described with reference to FIG. The chip resistor 10 according to the present invention includes:
It comprises a rectangular parallelepiped substrate 11, a pair of electrodes 12 printed and fired on both ends of the substrate 11, and a resistor 13 fired between the electrodes 12 by meandering three turns by screen printing technique.

Next, a method of manufacturing the chip resistor according to the first embodiment will be described. First, a pair of electrodes 12 is formed by printing and baking an electrode paste on both ends of the substrate 11, and then screen printing and baking a resistance paste so that the electrodes 12 are connected in a meandering manner for three turns. The body 13 is formed. Therefore, since the resistor 13 meanders three turns, the length becomes sufficiently long, and the surge characteristics can be improved. Further, the chip resistor can be manufactured by a simple manufacturing process including only screen printing.

A second specific example will be described with reference to FIG. The chip resistor 20 according to the present invention has a rectangular parallelepiped substrate 21.
And a pair of electrodes 2 printed and fired on both ends of the substrate 21
And a resistor 23 having five trimming grooves 24 formed by laser trimming after screen printing and firing a rectangular resistor 23 between the electrodes 22.

Next, a method of manufacturing the chip resistor according to the second embodiment will be described. First, a pair of electrodes 22 is formed by printing and baking an electrode paste on both ends of the substrate 21, and then baking a rectangular resistor 23 by screen printing so as to connect the electrodes 22, and then performing a laser trimming method. , The resistance value is corrected, five trimming grooves 24 are formed, and the resistor 23 is meandered by five turns. Therefore, since the resistor 23 is meandering for 5 turns with the trimming groove 24 formed, the length becomes very long, the resistance value increases as compared with the rectangular resistor, and the surge characteristics are further improved. Further, since the formation of the trimming groove also serves to correct the resistance value, a chip resistor having high resistance value accuracy can be supplied.

A third specific example will be described with reference to FIG. The chip resistor 30 according to the present invention has a rectangular parallelepiped substrate 31.
And a pair of electrodes 3 printed and fired on both ends of the substrate 31
2 and a resistor 33 in which one trimming groove 34 is formed between the electrodes 32 by means of screen printing in a meandering two turns and firing.

Next, a method of manufacturing the chip resistor according to the third embodiment will be described. First, a pair of electrodes 32 is formed by printing and baking an electrode paste on both ends of the substrate 31. Then, a resistance paste is screen-printed and baked so that the electrodes 32 are connected in a meandering manner for two turns. After the body 33 is formed, the resistance value is corrected by a laser trimming method, one trimming groove 34 is formed, and the resistor 33 is meandered for three turns. Therefore, by using a technique such as screen printing and laser trimming in combination, the formation of trimming grooves by trimming processing can be reduced, the manufacturing can be performed efficiently, and since the resistor 33 meanders three turns, the length is sufficiently large. It is possible to provide a chip resistor having high resistance value accuracy because the length becomes longer and the surge characteristics can be improved, and the formation of the trimming groove also serves to correct the resistance value.

A fourth specific example will be described with reference to FIGS. A chip resistor 40 according to the present invention includes a rectangular parallelepiped substrate 41, a pair of electrodes 42 printed and fired on both ends of the substrate 41, and a screen printing between the electrodes 42.
After turning and baking, the resistor 43 has two trimming grooves 44 formed by laser trimming. That is, in the chip resistor 40 shown in FIG.
Therefore, the trimming groove 44 is, as apparent from FIG.
Of the four grooves provided in the resistor 43,
In the middle of these grooves.
You.

Next, a method of manufacturing the chip resistor according to the fourth embodiment will be described. First, the electrode paste is printed and fired on both ends of the substrate 41 to form a pair of electrodes 42, and then the resistance paste is screen-printed and fired so that the electrodes 42 are connected in a meandering manner for two turns. After the body 43 is formed, the resistance value is corrected by a laser trimming method, and two trimming grooves 44 are formed, and the resistor 43 is meandered for four turns. That is, FIG.
As is clear from the figure, the grooves formed by this screen printing
In the position between the parts, the number of the grooves is equal in the direction between the electrodes.
A trimming groove 44 is formed at a desired position. Sand
Screens are provided on both sides of the trimming groove 44 in the direction between the electrodes.
There is one groove formed by printing. Therefore, since the resistor 43 meanders four turns, the length becomes very long, and the surge characteristics can be further improved.
Further, since the formation of the trimming groove also serves to correct the resistance value, it is possible to supply a chip resistor having high resistance value accuracy.

The shape, size, material forming method and the like of each component of the chip resistor according to the present invention can be arbitrarily set within the range in which the above-mentioned problems, means for solving the problem, and effects of the invention described later are achieved. It goes without saying that any of these changes does not change the gist of the present invention in any way.

[0016]

The chip resistor and the chip according to the present invention
According to the resistor manufacturing method, the surge characteristics are better than before.
It will be good. In other words, the resistor meanders for more than three turns and
Is sufficiently long, and the resistance value is several times greater than that of a rectangular resistor.
It can be increased from double to about 20 times, further surge characteristics
To be good. In addition, the formation of the trimming groove
Since it also serves as a correction, it has the effect of increasing the resistance value accuracy.
You. In addition, screen printing etc. and laser trimming etc.
Trimming by trimming to use the technique together
Groove formation is less than without printing techniques
No. As described above, the present invention has a unique
It is an invention that is effective and very practical.

Further, according to the method of manufacturing a chip resistor according to the fifth aspect of the present invention, since techniques such as screen printing and laser trimming are used in combination, the formation of the trimming grooves by trimming requires the printing technique. It requires less than when not in use, and the resistor meanders three or more turns to have a sufficiently long length, further improving surge characteristics, and the formation of a trimming groove also serves to correct the resistance value. Therefore, there is an effect that the resistance value accuracy is increased. As described above, the present invention has unique effects that have never been seen before and is a practical and excellent invention.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first specific example of the present invention.

FIG. 2 is a plan view showing a second specific example of the present invention.

FIG. 3 is a plan view showing a third specific example of the present invention.

FIG. 4 is a plan view showing a fourth specific example of the present invention.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a plan view showing a specific example of the related art.

[Explanation of symbols]

 10, 20, 30, 40 Chip resistor 11, 21, 31, 41 Substrate 12, 22, 32, 42 Electrode 13, 23, 33, 43 Resistor 24, 34, 44 Trimming groove

Claims (4)

(57) [Claims] 1. A chip resistor, comprising: a substantially rectangular parallelepiped substrate; a pair of electrodes formed at both ends of the substrate; and a resistor provided between the electrodes, wherein a connection position between the electrodes is located approximately diagonal positions includes a resistor formed on more meandering shape <br/> that is an even number alternately provided from the groove upper end and a lower end disposed in the width direction of the substrate, and the A pair of grooves at substantially symmetrical positions among the grooves
A pair of grooves located at substantially the center of the grooves provided in
The part is formed by trimming, while the trimming
Grooves other than the pair of grooves formed above are
A chip resistor characterized by being formed by printing . 2. An even number of the above-mentioned number is four, and the number
The two grooves located are formed by trimming,
Are formed by screen printing
The chip resistor of claim 1, wherein the are. 3. A method for manufacturing a chip resistor, comprising: a first step of forming a pair of electrodes at both ends of a substrate; and a step of forming a resistor between the electrodes, wherein a connection position between the electrodes is provided. Are substantially diagonal positions, a second step of forming a resistor in a substantially meandering shape by screen printing grooves formed in the width direction of the substrate from the upper end and the lower end in an even number alternately provided, A groove portion formed in the second step by forming a pair of trimming grooves in the resistor at substantially symmetric positions.
Formed in the second step in the direction between the electrodes at a position between the electrodes.
A third step of forming the resistor in a meandering shape by forming grooves at positions where the number of grooves is equal on both sides . 4. A shape in which the resistor is meandered by two turns in the second step, and a pair of trimming grooves is formed in the third step to form a meandering shape by four turns in the resistor. Then, a pair of the pair formed in the second step
The trimming groove formed in the third step is arranged between the groove portions.
4. The method for manufacturing a chip resistor according to claim 3, wherein the chip resistor has a shape .