JPH0414802A - Adjusting device of resistance value - Google Patents

Abstract

PURPOSE:To eliminate a need for a short-circuit contact on a printer-circuit board and to simplify the pattern on the printed-circuit board by a method wherein an interface circuit provided with a short-circuit contact is connected across a thin-film resistance element and the printed-circuit board and a resistance value is adjusted by using the short-circuit contact of the interface circuit. CONSTITUTION:When a resistance value is adjusted, a terminal 41 of a printed-circuit board 4 is connected, via an interface circuit 10, to one external connecting terminal 1a of a trimming resistance 2 of a thin-film resistance element 1, one end of a short- circuit contact 10a is connected to an external connecting terminal 1b, and the other end of a short-circuit contact 10d is connected to a terminal 46 of the printed-circuit board 4. Both ends of short-circuit contacts 10a to 10d are connected respectively to terminals 42 to 46. After that, the short-circuit terminals 10a to 10d are made; resistances 6, for adjustment use, which have been connected across the terminal 42 to 46 of the printed-circuit board 4 are short-circuit. Thereby, on the basis of a combination of a jumper wire 3 having an obtained and desired amplification factor with the resistances 6 for adjustment use, external connecting terminals 1a to 1f of the thin-film resistance element 1 are made to correspond to the terminals 41 to 46 of the printed-circuit board 4 after a trimming operation has been finished; they are mounted by a soldering operation; a circuit is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resistance value adjusting device for obtaining an amplification factor such that input signals having individual variations fall within a predetermined range.

[Conventional technology]

FIG. 2 is a circuit configuration diagram showing a conventional resistance value adjusting device. In FIG.
The trimming resistor 2 and jumper wire 3 are equipped with trimming resistor external connection terminals 2a, 2b and jumper wire external connection terminals 3a, 3b, 3c, 3d, 3e, 3f, 3.
g, 3h are provided. 4 is one external connection terminal 2 of the thin film resistive element 1.
3 e t 3 g and one terminal 4 a p 4 c
p 4 e * 4 g # 4 x is short contact 5
a, 5b, 5c, and 5d, and the other external connection terminals 3b, 3d, and 3f.

3h to the other terminals 4b, 4d, 4f, 4h, and 4j.This printed board 4 amplifies the input signal so that the output signal range does not vary. Terminals 4a, 4b, 4c, 4d, 4 of the printed board 4
e, 4f, 4gl 4h.

A resistor 6 is connected between 4i and 4j, which is provided with a desired function by trimming and determines the amplification factor of the amplifier board.

Next, the operation will be explained.

Since the input signals are signals that vary individually, it is not possible to obtain the desired amplification factor by simply mounting the resistor 6 with a fixed constant (if the amplification factor of the amplifier board is constant, the output signal will vary).

Therefore, a resistor for trimming is mounted to obtain an amplification factor that always falls within a predetermined range even with input signals having variations. Namely.

After trimming the trimming resistor 2, which jumper wire 3 is to be cut at the short contact 5a.

5b, 5c, and 5d to obtain a desired amplification factor while determining which adjustment resistor 6 is connected to the trimming resistor 2.

For this purpose, the external connection terminal 2a of the thin film resistance element 1 is provided.

2b, 3a, 3b, 3c, 3d, 3s, 3f, 3g +
3 b terminals 4a, 4b, 4c+4d of printed board 4
, 4e, 4f, 4g, 4ht 4i, 4j are connected correspondingly, and short contacts 5a, 5b are made as appropriate.

5c and 5d are closed to obtain a desired amplification factor in a simulated manner. Based on the thus obtained combination of the jumper wire 3 with the desired amplification factor and the adjustment resistor 6, after trimming, the thin film resistive element 1 is mounted on the printed board 4, and then the short contacts 5a, 5b are mounted.

The circuit is completed by connecting 5c and 5d with solder.

[Problem to be solved by the invention]

The conventional resistance value adjusting device forms a circuit in which the thin film resistive element 1 and the printed board 4 are connected to obtain the desired amplification factor as described above, so the assembly after adjusting the resistance value is sometimes performed using the short contact 5a. , 5b, 5c.

There was a problem in that the user forgot to short-circuit 5d, resulting in the formation of an improperly adjusted circuit.

This invention was made in order to solve the above-mentioned problems, and it simplifies the pattern of the printed board by eliminating the need for short contacts on the printed board, and the assembly of the thin film resistor and the printed board sometimes requires short contacts. It is an object of the present invention to provide a resistance value adjusting device which eliminates forgetting of short circuits and reduces costs.

[Means to solve the problem]

A resistance value adjusting device according to the present invention includes a thin film resistive element having a trimming resistor and a jumper wire, a printed board having an adjusting resistor, and an interface circuit including a shorting contact for connecting the thin film resistive element and the printed board. It is composed of:

[Effect]

The resistance adjusting device of the present invention connects an interface circuit having a shorting contact between the thin film resistive element and the printed board, and adjusts the resistance value using the shorting contact of this interface circuit. This eliminates the need to forget to connect a short contact when connecting the circuit board, and eliminates the need for a short contact on the printed board, simplifying the pattern of the printed board and reducing costs.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a circuit configuration diagram showing an embodiment of the present invention. In FIG. 1, the same or equivalent components as those in FIG. In the figure, 10 indicates short contacts 10a, 10b, 10c, and 10 connected in series.
This interface circuit 10 connects one external connection terminal 1a of the trimming resistor 2 to the terminal 41 of the printed board 4, and connects one end of the short contact 10a to the external connection terminal of the thin film resistor 1. 1b, and the other end of the short contact 10d is connected to the terminal 46 of the printed board 4. Further, the short contact 10a is between the terminals 42 and 43, and the short contact 10b is between the terminals 43 and 44.
0c is connected between terminals 44 and 45, and short contact 10d is connected between terminals 45 and 46, respectively.

Note that 1b in the figure also serves as an external connection terminal for the trimming resistor 2 and jumper wire 3, and lc and ld.

le and if serve as external connection terminals for each jumper wire 3 of the thin film resistance element 1.

Next, the operation will be explained.

First, to adjust the resistance value, connect the terminal 41 of the printed board 4 to one external connection terminal 1a of the trimming resistor 2 of the thin film resistance element 1 via the interface circuit 10, and connect the short contact 10a to the external connection terminal 1b. one end and the other end of the short contact 10d to the terminal 46 of the printed board 4.
Connect to.

Furthermore, short contact 10ay 10bl 10cy1
Connect both ends of 0d to terminals 42, 43, 44°45.
Connect to 46.

After that, short contacts 10a and 10b are opened as appropriate.

10c and 10d are closed and the terminals 42.4 of the printed board 4 are connected.
Adjustment resistor 6 connected between 3, 44, 45, and 46
A desired amplification factor is obtained for each simulation by short-circuiting. Based on the thus obtained combination of the jumper wire 3 and the adjustment resistor 6 with the desired amplification factor, the external connection terminals 1a+ lb, l of the thin film resistive element 1 are connected after trimming is completed.
c, ld.

le, if to terminals 41, 42, 43.4 of printed board 4
4, 45, and 46 to complete the circuit by soldering. With this configuration, the number of connection points between the thin film resistive element and the printed board can be reduced.

〔Effect of the invention〕

As described above, according to the present invention, an interface circuit having a shorting contact is connected between the thin film resistive element and the printed board, and the resistance value is adjusted using the shorting contact of this interface circuit. This eliminates the need to forget to connect a short contact when connecting a resistive element and a printed board, and eliminates the need for a short contact on the printed board, simplifying the pattern of the printed board and reducing costs.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing a resistance adjustment device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram showing an example of a conventional resistance adjustment device. DESCRIPTION OF SYMBOLS 1... Thin film resistance element, 2... Trimming resistance, 3...
...Jumper wire, 4...Printed board, 6...Adjustment resistor, 10...Interface circuit.

Claims (1)

[Claims] a thin film resistance element having a trimming resistor and a plurality of jumper wires and used for output adjustment; a printed board having an adjustment resistor to which the thin film resistance element is connected and whose output is adjusted by the trimming resistor and the jumper wires; A resistance value adjusting device comprising an interface circuit having a shorting contact for temporarily connecting the thin film resistive element and the printed board to provide a desired function.