JP2684935B2 - Trimming resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type trimming resistor used for various electronic devices and a trimming resistor used for a trimming printed resistor circuit in a hybrid IC.

[0002]

2. Description of the Related Art A trimming resistor adjusts a resistance value of a completed film-shaped resistor while shaving or forming an adjustment groove, thereby obtaining a highly accurate resistance value or circuit resistance. The resistance value satisfying the characteristics can be obtained.

The present inventors have previously proposed a chip-type trimming resistor having four external electrodes on an insulating substrate and one film-shaped resistor connected to all of the external electrodes. . This conventional chip type trimming resistor will be described with reference to the drawings.

6 (a) and 6 (b) show a thick film type chip resistor as an example of a conventional trimming resistor. FIG. 6 (a) is a plan view and FIG. 6 (b) is the same. 6 in Figure (a)
FIG. 6 is a cross-sectional view taken along line b-6b (note that a plan view is partially shaded in the same direction as the cross-sectional view for easy understanding).

As shown in FIGS. 6 (a) and 6 (b), a first and a second pair of external electrodes 2-on both ends of the rectangular parallelepiped insulating substrate 1 made of alumina or the like on the long side. 1-2-4 are formed. Each of the external electrodes 2-1 to 2-4 is palladium-
It is made of a silver-based material and arranged in a shape and a positional relationship that are line-symmetric or point-symmetric with respect to the vertical center axis of the insulating substrate 1. External electrodes 2-1 to 2-4 are provided on the insulating substrate 1.
And a thick film resistor 3 which is a film resistor and is made of a ruthenium oxide-based material. The thick-film resistor 3 is covered with a protective film 4 made of low-melting glass or resin.

FIGS. 7 (a) and 7 (b) are shown in FIG.
An example of use in which the conventional chip-type trimming resistor shown in (b) is soldered on a wiring board to form a trimming resistance circuit is shown in FIG. It is a front view. As shown in FIGS. 7A and 7B, two pairs of first and second soldering lands 7-1 to 7-4 are formed on the wiring board 6 formed by a general method or material. Has been formed. Two pairs of external electrodes 2-1 to 2-4 of the trimming resistor 5 are provided on the soldering lands 7-1 to 7-4.
Are joined by a solder 8 by a general method such as reflow, dip, and soldering iron. And the thick film resistor 3
Along the longitudinal direction from the center of the edge 11 between the first pair of external electrodes 2-1 and 2-2 connected to the resistor terminals 9 and 10 from above the protective film 4, that is, the second The resistance value between the resistor terminals 9 and 10 is adjusted by cutting through the adjustment groove 12 by a general method such as laser, sand blast, or cutter toward the pair of external electrodes 2-3 and 2-4. I do.

FIG. 8 is a diagram showing a resistance change ratio between the resistor terminals 9 and 10 due to the notch of the adjusting groove 12 in the conventional example. The change rate of the resistance value is determined by the shape, size,
Although it varies depending on the positions, dimensions, and the like of the external electrodes 2-1 to 2-4, a resistance value change rate of about 10 times can be generally obtained in practical use.

FIG. 9 is a plan view showing another usage example in which the trimming resistor circuit is constructed by soldering the chip type trimming resistor 5 shown in FIGS. 6A and 6B onto the wiring substrate 6. (However, in order to make it easier to understand, some of them are shaded.)

In this example, as shown in FIG.
Pair of soldering lands 7-1 and 7-2 are connected to the resistor terminals 9 and 10, and the other pair of second soldering lands 7-3 and 7-4 are connected by a bypass wiring pattern 13. Has been done. Then, similarly, the first pair of external electrodes 2-1 and 2-
The adjustment groove 12 is cut from the center of the edge 11 between the two to adjust the resistance value between the resistor terminals 9 and 10, and the other configuration is the same as the above-described conventional example.

FIG. 10 shows the resistor terminals 9 and 1 associated with the cutting of the adjustment groove 12 in the trimming resistance circuit shown in FIG.
It is a figure which shows the resistance change ratio between 0. In this example, as shown by the chain line in FIG. 9, the cut depth of the adjustment groove 12 becomes deep, the uncut portion 14 of the thick film resistor 3 becomes small, and even if the resistance value of this portion becomes large, the current Is the cutting remainder 14
Since the wiring pattern 13 having a lower resistance value shunts more, the increase in the resistance value can be suppressed. Therefore, the adjustment groove 12 can be deeply cut into a range where a larger resistance value change rate can be obtained. Even if the thick film resistor 3 is accidentally completely cut off, since it is connected by the wiring pattern 13, the resistance value between the resistor terminals 9 and 10 does not become infinity but becomes a certain constant value. , Do not damage other parts or cause abnormal operation.

The present inventors have also proposed an example of use in a trimming printed resistor circuit having a similar function. That is, a first and a second pair of external electrodes in total and one film-like resistor connected to all of the external electrodes are formed on the wiring board, and the first one of the two pairs of external electrodes is formed. A pair of external electrodes is used as a resistor terminal, and a second pair of external electrodes that are not used as a resistor terminal are connected to each other on a wiring board, and a film-like portion sandwiched between the first pair of external electrodes is formed. An adjustment groove is formed in the film-shaped resistor with the edge of the resistor as a cutting start point toward the side of the film-shaped resistor sandwiched between the second pair of external electrodes, and a resistance between the resistor terminals is formed. This is a trimming printed resistance circuit whose value is changed. An example of use of this conventional printed resistance circuit for trimming will be described with reference to the drawings. 11 (a) and 11 (b) show another example in which a trimming printed resistor circuit is configured using the trimming resistors in another conventional example, and FIG.
Is a plan view, and FIG. 11B is a cross-sectional view taken along line 11b-11b in FIG. 9A (note that the plan view is hatched in the same direction as the cross-sectional view for easy understanding). ing.).

As shown in FIGS. 11 (a) and 11 (b), there are a total of two pairs of first and second palladium-silver based materials on a wiring board 6 constructed by a general method or material. The external electrodes 2-1 to 2-4 are formed by printing and firing.
These external electrodes 2-1 to 2-4 are arranged in a point-symmetrical shape and positional relationship. In the figure, the first pair of outer electrodes 2-1 and 2-2 on the right side are connected to and integrated with the resistor terminals 9 and 10 made of the same material as the outer electrodes of the second pair on the left side. 2-3 and 2-4 are connected to each other and integrated by a wiring pattern 13 for bypass made of a material similar to this. On the wiring substrate 6, the thick film resistor 3 which is connected to all of the external electrodes 2-1 to 2-4 and is a film resistor made of a ruthenium oxide-based material is printed in a rectangular shape, and is formed by firing. I have. And
The thick film resistor 3 has a resistor terminal 9, 10 on the side of the first pair of external electrodes 2-1 and 2-2 from the center portion of the end edge 11 between the other second external electrode 2-3. Laser between 2-4,
The resistance value between the resistor terminals 9 and 10 is adjusted by cutting the adjustment groove 12 by a general method such as sandblasting or a cutter.

FIG. 12 is a diagram showing a resistance change ratio between the resistor terminals 9 and 10 due to the notch of the adjusting groove 12 in the conventional example. In this example, as shown by the chain line in FIG. 11, the cut depth of the adjustment groove 12 becomes deep, the uncut portion 14 of the thick film resistor 3 becomes small, and even if the resistance value of this portion becomes large, the current Is a wiring pattern 1 with a lower resistance
3 is more flowable, so that an increase in resistance value can be suppressed. Even if the thick film resistor 3 is completely cut off, the thick film resistor 3 is still connected by the wiring pattern 13. Therefore, the resistor terminal 9 The resistance value between 10 and 10 does not become infinite, and shows a constant value determined by the thick film resistor 3 and the conditions of the cut.

As described above, also in the conventional trimming resistor 5, the resistance value between the resistor terminals 9 and 10 can be trimmed by cutting the film-shaped resistor 3.

[0015]

However, the conventional trimming resistor has the following problems.

In the case where the trimming resistor circuit shown in FIG. 7 is formed by using the trimming resistor shown in FIG. 6, at the beginning of the cut of the film resistor 3, the resistor terminal 9,
The resistance value between 10 does not change so much (see FIG. 8), and the resistance value between the resistor terminals 9 and 10 after the adjustment groove 12 passes between the first pair of external electrodes 2-1 and 2-2. Will increase. As described above, while the film-shaped resistor 3 is cut at a portion between the first pair of external electrodes 2-1 and 2-2 connected to the resistor terminals 9 and 10, the film-shaped resistor 3 functions as a trimming resistor. Does not function. Also, the cutting of the film-shaped resistor 3 proceeds, and the adjustment groove is formed in the film-shaped resistor 3 between the second pair of external electrodes 2-3 and 2-4 on the side opposite to the resistor terminals 9 and 10. When the number 12 is formed and the remaining cutting portion 14 decreases, the resistance change ratio can be increased, but the change becomes abrupt and the resistance setting accuracy cannot be obtained. In addition, current concentration occurs in this portion, and the temporal stability of the resistance value decreases, and the allowable power decreases. Furthermore, if the film resistor 3 is accidentally completely cut, the resistance value becomes infinite (see FIG. 8), and depending on the circuit, other parts may be destroyed or abnormal operation may occur. Therefore, the area that can be actually used for trimming is limited to a portion excluding the vicinity of the two pairs of external electrodes 2-1 and 2-2 and 2-3 and 2-4, and it is impossible to obtain a larger resistance change ratio. Impossible.

In the structure shown in FIG. 9, the film resistor 3 is used.
At the beginning of incision, there is the same problem as described above (see FIG. 10). Then, the second pair of external electrodes 2-3,
When the adjustment groove 12 is formed in the film resistor 3 in the vicinity of 2-4, the current is bypassed by the wiring pattern 13 having a low resistance value, and the current when the remaining uncut portion 14 of the film resistor 3 becomes small. The problem due to concentration is solved, and even if the film-shaped resistor 3 is completely cut off, the resistance value does not become infinite, but the resistance value does not rise above a certain value (see FIG. 10).
), Does not function as a trimming resistor. Therefore, also in this example of use, the area that can be actually used for trimming is limited to the part excluding the vicinity of the two pairs of external electrodes 2-1, 2-2 and 2-3, 2-4, and a larger resistance change. It is impossible to get a ratio.

On the other hand, the printed resistor for trimming formed on the wiring board 5 shown in FIG. 11 has the same problem as described above (see FIG. 12).

The present invention solves such a conventional problem, and a larger resistance change ratio can be easily obtained without actually changing the area usable for trimming. Therefore, the resistance value can be increased. An object of the present invention is to provide a trimming resistor capable of ensuring the setting accuracy and preventing the deterioration of stability over time and the reduction of allowable power.

[0020]

Means for Solving the Problems The technical means of the present invention for achieving the above object is to provide two pairs of first and second external electrodes on an insulating substrate or a wiring substrate, and all of the above. A film resistor connected to the external electrode is formed, and the first resistor is connected to the film resistor so that the width of the film resistor between the pair of external electrodes on the resistor terminal side is gradually narrowed.
A plurality of adjustment grooves for adjusting the resistance value are sequentially formed between the pair of external electrodes and between the second pair of external electrodes.
The resistance value between the pair of external electrodes is adjusted.

Another technical means of the present invention for achieving the above object is to connect two pairs of first and second external electrodes on an insulating substrate or a wiring substrate and all the above external electrodes. A film resistor for forming a film resistor is formed, and the film resistor is external to the first pair so that the width of the film resistor between the pair of external electrodes on the resistor terminal side becomes gradually narrower. A plurality of resistance adjusting grooves are successively formed while being repeatedly folded back between the electrodes between the outer electrodes of the first pair and between the outer electrodes of the second pair. The resistance value between the electrodes is adjusted.

[0022]

Therefore, according to the present invention, a plurality of adjustment grooves are formed in the film resistor, or the adjustment grooves are formed by continuously bending back a plurality of adjustment grooves to form the first pair on the resistor terminal side. It is possible to narrow the width of the film-shaped resistor that connects the external electrodes and increase the resistance value, and it is possible to easily increase the resistance change ratio.

[0023]

【Example】

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing an example of use in which a trimming resistance circuit is constructed by mounting a chip type trimming resistor formed by a thick film method on a wiring board in a first embodiment of the present invention. There is (in order to make it easier to understand, some parts are shaded with different directions).

As shown in FIG. 1, a first and a second pair of external electrodes 2-1 to 2-4 are formed on both ends of the rectangular parallelepiped insulating substrate 1 on the long side. Has been done. Each of the external electrodes 2-1 to 2-4 is made of a palladium-silver based material, is formed so as to cover the side surface, a part of the upper surface, and a part of the lower surface of the insulating substrate 1, and with respect to the vertical central axis of the insulating substrate 1. Are arranged in line symmetry or point symmetry. External electrodes 2-1 to 2- are formed on the upper surface of the insulating substrate 1.
4, a thick film resistor 3 which is a film resistor made of a ruthenium oxide-based material or the like is formed.
The thick film resistor 3 is a protective film 4 made of low melting glass or resin.
Coated with On the other hand, the first and second total two pairs of soldering lands 7-1 to 7-4 are formed on the wiring board 6 formed by a general method or material and the trimming resistor 5 is used.
Are provided corresponding to the positions of the two pairs of external electrodes 2-1 to 2-4. The first pair of external electrodes 2-1 and 2-2 and the second pair of external electrodes 2-3 and 2 of the trimming resistor 5
-4 is applied to the first pair of soldering lands 7-1 and 7-2 and the second pair of soldering lands 7-3 and 7-4 by a general method such as reflow, dip or soldering iron. It is joined by solder 8. The first pair of soldering lands 7-1 and 7-2 located on the right side in the figure are connected to the resistor terminals 9 and 10 of the wiring board 6, and the second pair of soldering lands 7- located on the left side. 3 and 7-4 are wiring boards 6
Are connected to each other by a wiring pattern 13 for bypass.

The thick film resistor 3 is connected to the resistor terminals 9 and 10 from the protective film 4 on the first pair of external electrodes 2-.
Along the longitudinal direction from the edge 11 between 1 and 2-2, that is, toward the side of the film resistor 3 sandwiched between the second pair of external electrodes 2-3 and 2-4. Resistance value adjusting groove 12 by a general method such as laser, sandblast, or cutter
To form At this time, for example, first, the first adjustment groove 12-1 is formed at the central portion between the first pair of external electrodes 2-1 and 2-2.
Then, the second adjustment groove 12-2 is formed on the side of the first adjustment groove 12-1 in the same manner as above, avoiding the first adjustment groove 12-1. Next, on the side of the first adjustment groove 12-1 located on the opposite side of the second adjustment groove 12-2, that is, between the first and second adjustment grooves 12-1 and 12-2. Avoiding this, the third adjusting groove 12-3 is formed in the same manner as above. In this manner, the work of sequentially cutting is repeated a plurality of times in the same manner as described above, avoiding the portion sandwiched between the adjustment grooves 12-1 to 12-3 already formed, and the external electrode 2
While adjusting the width of the thick film resistor 3 between −1 and 2-2 gradually, the resistance value between the first pair of external electrodes 2-1 and 2-2, that is, between the resistor terminals 9 and 10 is adjusted. To do.

FIG. 2 shows the adjusting groove 12- in the above embodiment.
It is a figure which shows the resistance change ratio between the resistor terminals 9 and 10 accompanying the notch of 1, 12-2, and 12-3. As is apparent from FIG. 2, when the first adjustment groove 12-1 is cut, the resistance value increases according to the conventional example. In the cut at the center of the thick film resistor 3, a resistance change ratio of about 10 times is generally obtained. Next, the second adjustment groove 12
-2, all external electrodes 2-
The thick film resistor 3 connecting 1 to 2-4 becomes narrower in width as shown by 3-1 as the cutting progresses, and the resistance value increases. When the thick film resistor 3 is cut at a dividing position of approximately 1/2 between the first adjusting groove 12-1 at the central portion and the long side edge, a resistance change ratio of about 15 times is generally obtained. To be Further, on the side opposite to the second adjustment groove 12-2, the third adjustment is performed at a half position between the first adjustment groove 12-1 in the central portion of the thick film resistor 3 and the long side edge. Adjustment groove 12-3
And cut all the external electrodes 2-1 to 2-1 like the above.
As the notch progresses, the thick film resistor 3 connecting -4 becomes narrower in width as shown by 3-2, and the resistance value increases, and this notch provides a resistance change ratio of about 20 times. .

As described above, according to the first embodiment, it is possible to easily obtain a large resistance change ratio, and therefore, it is possible to ensure the accuracy of setting the resistance value and to cause current concentration. Therefore, the stability of the resistance value with time does not decrease, and the allowable power does not decrease. Further, even if the thick film resistor 3 is accidentally completely cut, the resistance value does not become infinite.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a plan view showing a usage example in which a trimming printed resistor circuit is constructed by using a trimming resistor according to the second embodiment of the present invention (note that for the sake of easy understanding, a part thereof is shown). It is marked with diagonal lines.).

As shown in FIG. 3, a first and a second pair of external electrodes 2-1 and 2 made of a palladium-silver-based material are provided on a wiring board 6 formed by a general method or material. -4
Are printed and fired. These external electrodes 2-1 to 2-4 are arranged in a point-symmetrical shape and positional relationship. In the figure, the first pair of external electrodes 2-1 and 2-2 located on the right side are connected to the resistor terminals 9 and 10 made of the same material as those on the wiring board 6 to be integrated, and on the left side. Second pair of external electrodes 2-3, 2-4 located
Are interconnected and integrated on the wiring board 6 by the bypass wiring pattern 13 made of a material similar to this. All the external electrodes 2-1 to 2 are provided on the wiring board 6.
-4, a film resistor 3 made of a ruthenium oxide-based material or the like is printed in a rectangular shape and fired.

The film resistor 3 is connected to the resistor terminal 9,
Membrane resistance of the portion sandwiched between the edge 11 between the first pair of external electrodes 2-1 and 2-2 connected to 10 and the second pair of external electrodes 2-3 and 2-4 Adjustment grooves 12-1, 12-2, 12- of the first, second, and third resistance values are directed toward the sides of the body 3.
3 are sequentially formed in the same manner as in the first embodiment, and are formed between the first pair of external electrodes 2-1 and 2-2, that is, the resistor terminal 9,
The resistance value between 10 is changed. Also in the second embodiment, the resistance change ratio characteristic shown in FIG. 2 can be obtained.

As described above, also in the second embodiment, a large resistance change ratio can be easily obtained. In addition, the same effects as in the first embodiment can be obtained.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a plan view showing an example of use in which a trimming resistor circuit is constructed by mounting a chip type trimming resistor formed by a thick film method on a wiring board in a third embodiment of the present invention. There is (in order to make it easier to understand, some parts are shaded with different directions).

Since this embodiment is the same as the first embodiment except for the method of cutting the adjusting groove 12, the same parts are designated by the same reference numerals, and the description thereof will be omitted. The cutting method of will be described.

As shown in FIG. 4, first, the resistor terminals 9,
The thick film resistor 3 sandwiched between the central edge 11 between the first pair of external electrodes 2-1 and 2-2 on the 10th side and the second pair of external electrodes 2-3 and 2-4. The first adjustment groove 12-1 is formed in the thick film resistor 3 from above the protective film 4 toward the side of. Subsequently, from the end of the first adjustment groove 12-1 toward one long side edge of the thick film resistor 3 (the external electrode 2-3 side in the illustrated example),
The thick film resistor 3 is cut from above the protective film 4. From the end to the external electrode 2-1 side at the center of the first adjustment groove 12-1 and one long side of the thick film resistor 3, the thick film resistor 3 is provided with The second adjustment groove 12-2 is formed. The second adjustment groove 12-2 stops before reaching the edge of the thick film resistor 3. Then, from the end of the second adjusting groove 12-2 to the other long side edge of the thick film resistor 3 (in the illustrated example, the external electrode 2-
2), the thick film resistor 3 is cut from above the protective film 4 so as to intersect with the first adjustment groove 12-1. From the end of the first adjustment groove 12-1 to the central portion of the other long side of the thick film resistor 3, that is, the first and second adjustment grooves 12-1.
And 12-2, avoiding the gap between
-3 is formed. The adjustment groove 12 already formed in this way
In the same manner as above, avoiding the portion sandwiched between -1 to 12-3, perform a work in which a plurality of times are sequentially and repeatedly folded back and cut, and
The resistance value between the pair of external electrodes 2-1 and 2-2, that is, between the resistor terminals 9 and 10 is adjusted.

While cutting the first adjusting groove 12-1, the resistance value increases according to the conventional example. Further, while the second and third adjustment grooves 12-2 and 12-3 are being cut, the film resistor 3 connecting all the external electrodes 2-1 to 2-4 is accompanied by the progress of cutting. , The width becomes narrower as shown by 3-1 and 3-2, and the resistance value increases. This allows
Resistor terminals 9 and 1 associated with disconnection in the third embodiment
The resistance change ratio between 0 is the same as in FIG.

As described above, also in the third embodiment,
It is possible to easily obtain a large resistance change ratio. In addition, the same effect as the first embodiment can be obtained.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a plan view showing an example of use in which a trimming printed resistor circuit is constructed by using a trimming resistor according to a fourth embodiment of the present invention (for clarity, it is partially shown). It is marked with diagonal lines.).

This embodiment is the same as the second embodiment except for the method of cutting the adjusting groove 12, and the method of cutting the adjusting groove 12 is the same as that of the third embodiment. The same reference numerals are given to the parts, and the description thereof will be omitted.

Also in the fourth embodiment, the resistance change ratio characteristic shown in FIG. 2 is obtained, and the same effects as those of the second and third embodiments are obtained.

In each of the above embodiments, the thick film type trimming resistor and the printing type trimming resistor have been described. However, the thick film type trimming resistor and the printing type trimming resistor are not limited to the thin film type, the polymer type or the resin substrate. Can also obtain the same effect.

[0045]

As described above, according to the present invention, a plurality of adjusting grooves are formed in a film resistor formed on an insulating substrate or on a wiring substrate, or a plurality of adjusting grooves are continuously formed. By folding back and forming the adjustment groove, the width of the film-like resistor that connects between the first pair of external electrodes on the resistor terminal side can be narrowed and adjustment can be performed so as to increase the resistance value. In this way, a large resistance change ratio can be easily obtained, and therefore, the accuracy of setting the resistance value can be ensured, and moreover, current concentration may occur and the stability of the resistance value with time may decrease, or It does not cause a decrease in power.

[Brief description of the drawings]

FIG. 1 is a plan view showing a usage example in which a trimming resistor according to a first embodiment of the present invention is mounted on a wiring board to form a trimming resistor circuit.

FIG. 2 is a characteristic diagram of a resistance change ratio obtained by the trimming resistor.

FIG. 3 is a plan view showing an example of use in which a trimming printed resistor circuit is configured using a trimming resistor according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a usage example in which a trimming resistor according to a third embodiment of the present invention is mounted on a wiring board to form a trimming resistor circuit.

FIG. 5 is a plan view showing an example of use in which a trimming printed resistor circuit is configured using a trimming resistor according to a fourth embodiment of the present invention.

6A is a plan view showing a trimming resistor in a conventional example, FIG. 6B shows the trimming resistor, and FIG.
Sectional view along line 6b

FIG. 7A is a plan view showing a usage example in which the trimming resistor is mounted on a wiring board to form a trimming resistor circuit, and FIG. 7B is a front view of the trimming resistor circuit.

FIG. 8 is a characteristic diagram of a resistance change ratio obtained by the trimming resistor.

FIG. 9 is a plan view showing another usage example in which the trimming resistor according to the conventional example shown in FIGS. 6A and 6B is mounted on a wiring board to form a trimming resistance circuit.

FIG. 10 is a characteristic diagram of a resistance change ratio obtained by the trimming resistor.

FIG. 11A is a plan view showing a usage example in which a trimming resistor according to another conventional example is used to form a trimming printed resistor circuit, and FIG. 11B is a front view of the trimming printed resistor circuit.

FIG. 12 is a characteristic diagram of a resistance change ratio obtained by the trimming resistor.

[Explanation of symbols]

 1 Insulating Substrate 2 External Electrode 3 Membrane Resistor 4 Protective Film 5 Trimming Resistor 6 Wiring Board 7 Soldering Land 9 Resistor Terminal 10 Resistor Terminal 11 Edge 12 Adjustment Groove 13 Wiring Pattern

Claims (4)

(57) [Claims] 1. A first and a second pair of external electrodes and a film-shaped resistor connected to all of the above external electrodes are formed on an insulating substrate, and between the pair of external electrodes on the resistor terminal side. So that the width of the film-shaped resistor in the above-mentioned is gradually narrowed to the film-shaped resistor from between the first pair of external electrodes.
The trimming resistor is characterized in that a plurality of resistance value adjusting grooves are sequentially formed between the pair of external electrodes, and the resistance value between the first pair of external electrodes is adjusted. 2. A first and a second pair of external electrodes and a film resistor connected to all of the above external electrodes are formed on an insulating substrate, and between the pair of external electrodes on the resistor terminal side. So as to gradually narrow the width of the film resistor at the first position from the first pair of external electrodes to the film resistor.
Of the pair of external electrodes and the side of the second pair of external electrodes between which the resistance adjustment groove is sequentially formed while being continuously folded back to adjust the resistance value between the first pair of external electrodes. A trimming resistor characterized in that 3. A first and a second pair of external electrodes and a film resistor connected to all the external electrodes are formed on a wiring board, and between the pair of external electrodes on the resistor terminal side. So that the width of the film-shaped resistor in the above-mentioned is gradually narrowed to the film-shaped resistor from between the first pair of external electrodes.
The trimming resistor is characterized in that a plurality of resistance value adjusting grooves are sequentially formed between the pair of external electrodes, and the resistance value between the first pair of external electrodes is adjusted. 4. A first and a second pair of external electrodes and a film resistor connected to all the external electrodes are formed on a wiring board, and between the pair of external electrodes on the resistor terminal side. So as to gradually narrow the width of the film resistor at the first position from the first pair of external electrodes to the film resistor.
Of the pair of external electrodes and the side of the second pair of external electrodes between which the resistance adjustment groove is sequentially formed while being continuously folded back to adjust the resistance value between the first pair of external electrodes. A trimming resistor characterized in that