JPH0629110A - Function adjusting resistor - Google Patents

Abstract

PURPOSE:To change resistance curve of a resistor, enlarge a resistance value adjusting magnification and adjust a potential of the middle point by only one function adjusting resistor for the function adjusting resistor. CONSTITUTION:This embodiment comprises resistor layers 13, 14 arranged in a row on a 96 alumina substrate 11, a conductive layer 12 arranged on the same side of these resistor layers 13, 14, and function adjusting grooves 16, 17 formed by a laser trimming from an end towards a central part of the resistor layers 13, 14 on the side of this conductive layer 12. Thus, it becomes possible to change a resistance value adjusting curve and enlarge a resistance value adjusting magnification, and adjust a potential of the middle point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function adjusting resistor which is used in a high-density wiring circuit and which adjusts the circuit operation by adjusting the resistance value by laser trimming after mounting on the circuit.

[0002]

2. Description of the Related Art In recent years, with the ever-increasing demand for smaller, lighter, smaller electronic devices, very small resistors are often used as resistive elements in order to increase the wiring density of circuit boards. Came. In addition, the recent increase in density has reached the chip volume, and a high-magnification function adjusting resistor has been developed as a replacement for the chip volume.

An example of a conventional function adjusting resistor is shown in FIG.
It shows in (a) and the resistance value adjustment curve at this time is shown in FIG.5 (b). As shown in FIG. 5A, the conventional function adjusting resistor is configured by providing the glass layer 2 on the alumina substrate 1 and further providing the resistance layer 3 on the glass layer 2. After arranging the constructed resistor for function adjustment on the printed wiring board 6 on which the land patterns 4 and 5 are formed, a groove 7 for function adjustment is formed by laser trimming or the like.
The resistance value between the terminals A and B was adjusted by providing.

[0004]

Such a function adjusting resistor is laser-trimmed after the circuit is mounted, and its resistance adjusting curve is substantially determined by the shape of the function adjusting resistor. In order to change the above, it was necessary to use a plurality of function adjusting resistors. Also,
There is a problem that the function adjustment of the midpoint potential, which is possible with the semi-fixed resistance potentiometer, is not possible with the conventional function adjusting resistors.

The present invention solves the above problems all at once and eliminates the need to use a plurality of function adjusting resistors, and it is possible to change the resistance value adjusting curve of the resistor with only one function adjusting resistor. It is intended to provide a function adjusting resistor capable of enlarging a resistance value adjusting magnification and adjusting a midpoint potential.

[0006]

To achieve this object, a function adjusting resistor according to the present invention comprises an insulating substrate, a plurality of resistance layers arranged in parallel on the insulating substrate, and a plurality of resistance layers. A conductor layer arranged on the same side of the resistance layer so as to connect the plurality of resistance layers, and provided on at least one of the resistance layers from the end on the conductor layer side of the resistance layer toward the central portion. And a groove for function adjustment.

[0007]

The present invention eliminates the need to use a plurality of high-magnification function adjusting resistors, and provides a plurality of resistance layers including at least one resistance layer having a function adjusting groove formed on an insulating substrate. By forming it, it becomes possible to change the resistance value adjusting curve of the resistor and to expand the resistance value adjusting magnification with only one function adjusting resistor.

[0008]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the first of the present invention.
FIG. 6 is a top view of the function adjusting resistor in the example of FIG.

In the figure, 11 is an insulating substrate, 96
Alumina substrate, 12 is a conductor layer provided on the 96 alumina substrate 11, 13 and 14 are resistance layers arranged in parallel on the 96 alumina substrate 11 so as to be connected to the conductor layer 12, and 15 is a glass protective layer. Is. The resistance layers 13 and 14 are, as shown in FIG.
The conductor layers 12 arranged on the same side of 4 are wired in series. Here, the initial resistance values of the resistance layers 13 and 14 are set to the same value of 1 kΩ.

On the resistance layers 13 and 14 of the function adjusting resistor having the above-described structure, the grooves 16 and 17 for function adjusting by laser trimming were formed in this order.

FIG. 1B is a graph of the resistance value adjusting curve between the terminals A and B with respect to the dimensions of the function adjusting grooves 16 and 17 formed in the resistance layers 13 and 14 of FIG. 1A. As shown in FIG. 1B, the resistance value between terminals A and B is
It is about 20 times the initial resistance value, and it can be seen that the conventional resistance value adjustment magnification is about 10 times, whereas the resistance value adjustment ratio is greatly increased. The maximum incision size in the resistance layers 13 and 14 was 2.8 mm.

(Second Embodiment) A second embodiment of the present invention will be described below. The function adjusting resistor of this embodiment is shown in FIG.
In the resistor (a), the initial resistance value of the resistance layer 13 is set to 1
00Ω, and the initial resistance value of the resistance layer 14 is 1 kΩ. Grooves 16 and 17 for function adjustment by laser trimming were formed in this order on the resistance layers 13 and 14 of the function adjusting resistor configured as described above.

FIG. 2 shows the resistance layers 13 and 14 of FIG.
5 is a graph of a resistance value adjusting curve between terminals A and B with respect to the dimensions of the function adjusting grooves 16 and 17 formed in FIG. First, the resistor layer 13 is laser-trimmed to form terminals AB.
The resistance of the target resistance value between the terminals A and B can be increased by greatly increasing the resistance value between the target resistance value and the laser resistance trimming by switching the resistance layer 14 thereafter. The maximum incision size in the resistance layers 13 and 14 was 2.8 mm.

(Embodiment 3) A third embodiment of the present invention will be described below. 3A is a top view of the function adjusting resistor according to the present embodiment, and FIG. 3B is a terminal with respect to the dimensions of the function adjusting grooves 16 and 17 formed in the resistance layers 13 and 14 by laser trimming. It is a graph which shows the electric potential change between AB. In FIG. 3, 11 is a 96 alumina substrate, 12 is a conductor layer, 13 and 14 are resistance layers, 15
Is a glass protective layer, and the above has the same configuration as the first embodiment. Further, the intermediate terminal 18 is formed so as to be drawn out from between the connection portions of the conductor layer 12 with the resistance layers 13 and 14. The resistance layers 13 and 14 are shown in FIG.
They are wired in series as shown in (a). here,
The initial resistance value of the resistance layer 13 was 1 kΩ, and the initial resistance value of the resistance layer 14 was 1.2 kΩ.

Between terminals A and C, first 10
A constant voltage of V is applied. When the grooves 16 and 17 for adjusting the function are alternately formed by laser trimming on the resistance layers 13 and 14 of the function adjusting resistor to which the voltage is applied in this way, it is shown in FIG. 3B. As described above, the potential between the terminals A and B rises while the groove 16 for function adjustment by laser trimming is formed in the resistance layer 13,
While the function adjusting groove 17 is formed in the resistance layer 14, the resistance layer 14 descends.

As described above, according to this embodiment, the resistance layer 13
By alternately repeating laser trimming to and, it is possible to adjust the potential between terminals A and B while raising and lowering it.

(Embodiment 4) A fourth embodiment of the present invention will be described below. FIG. 4A is a top view of the function adjusting resistor according to this embodiment, and FIG. 4B is a function adjusting groove 17 formed in the resistance layer 14 by laser trimming.
5 is a graph showing a potential change between terminals C and B with respect to the dimension of FIG.

That is, in this embodiment, one resistance layer 13 is a fixed resistance layer as shown in FIG.
The other structure is the same as that of the third embodiment. Here, the initial resistance value of the resistance layer 13 was 5 kΩ, and the initial resistance value of the resistance layer 14 was 1 kΩ. The cut dimension into the resistance layer 14 was 2.8 mm.

First, 10 V is previously applied between terminals A and C.
Voltage is applied. When the function adjusting groove 17 is formed by laser trimming on the resistance layer 14 of the function adjusting resistor to which the voltage is applied in this way, FIG.
As shown in (b), the voltage between the terminals C and B is
It rises while forming the groove 17 for function adjustment by laser trimming. In this way, the potential near the target potential between the terminals A and B (the midpoint voltage of B) is formed by forming the groove 17 for function adjustment, and the potential between the terminals C and B is increased to further approach the target potential. Can be adjusted to

As described above, according to these embodiments of the present invention, it is not necessary to use a plurality of high-magnification function adjusting resistors, and by combining two resistance layers respectively,
It is possible to change the resistance value adjustment curve, increase the resistance value magnification, and adjust the midpoint potential with only one function adjustment resistor.

Although the number of resistance layers is limited to two in each embodiment, it goes without saying that the present invention can be applied to the case of two or more resistance layers. In addition, although the resistance value of the resistance layer is designated in each embodiment, any other resistance value may be used. However, the combination of the resistance values of the respective examples is practical.

[0022]

As described above, according to the present invention, a conductor layer is provided on the same side of a plurality of resistance layers arranged in parallel on an insulating substrate so as to connect these resistance layers, and By forming a function adjusting groove in at least one of the layers from the end on the conductor layer side of the resistance layer toward the central portion, it is possible to form a single resistor without using a plurality of high magnification function adjusting resistors. It is possible to change the resistance value adjustment curve of the resistor, increase the resistance value magnification, and adjust the midpoint potential with only the function adjusting resistor.

[Brief description of drawings]

1A is a top view of a function adjusting resistor according to a first embodiment of the present invention, and FIG. 1B is a resistance adjusting curve diagram of a function adjusting resistor according to the same embodiment.

FIG. 2 is a resistance adjustment curve diagram of a function adjusting resistor according to a second embodiment of the present invention.

3A is a top view of a function adjusting resistor according to a third embodiment of the present invention, and FIG. 3B is a resistance adjusting curve diagram of the function adjusting resistor according to the same embodiment.

FIG. 4A is a top view of a function adjusting resistor according to a fourth embodiment of the present invention, and FIG. 4B is a resistance adjusting curve diagram of the function adjusting resistor according to the same embodiment.

5A is a top view of a conventional function adjusting resistor, and FIG. 5B is a resistance adjustment curve diagram of a conventional function adjusting resistor.

[Explanation of Codes] 11 96 Alumina Substrate 12 Conductor Layers 13, 14 Resistive Layers 16, 17 Grooves for Function Adjustment 18 Intermediate Terminals

Claims (5)

[Claims] 1. An insulating substrate, a plurality of resistance layers arranged in parallel on the insulating substrate, and a conductor arranged on the same side of these resistance layers so as to connect the plurality of resistance layers. Layers and
A function-adjusting resistor comprising at least one of the resistance layers and a function-adjusting groove provided from an end of the resistance layer on the conductor layer side toward a central portion. 2. An insulating substrate, a plurality of resistance layers arranged in parallel on the insulating substrate, and a conductor arranged so as to connect the plurality of resistance layers on the same side of these resistance layers. Layers and
An intermediate terminal provided in a portion between the resistance layers of the conductor layer,
A function-adjusting resistor comprising at least one of the resistance layers and a function-adjusting groove provided from an end of the resistance layer on the conductor layer side toward a central portion. 3. The function adjusting resistor according to claim 1, wherein the resistance values of the plurality of resistance layers provided on the insulating substrate are substantially equal to each other. 4. The function adjusting resistor according to claim 1, wherein at least one of the resistance values of the plurality of resistance layers arranged on the insulating substrate is different. 5. The resistance layer disposed on one side of the plurality of resistance layers disposed on the insulating substrate with the intermediate terminal portion as a boundary is a fixed resistance layer. Function adjustment resistor.