JPS5852645Y2 - variable resistor - Google Patents

Description

[Detailed description of the invention] The present invention relates to a variable resistor, and an object of the present invention is to provide a variable resistor that can be applied to, for example, a screw-type variable resistor, and can obtain various resistance characteristics smoothly and at low cost with a simple configuration. With the goal.

As conventional variable resistors, there are those shown in FIGS. 1A and 1B that are applied to the above-mentioned screw type variable resistor.

In the figure, 1 is a resin case, and a resistor plate 2 of a predetermined length is attached to the bottom of the case by tightening the input terminals 3□, 3□, and a terminal fitting 4 is attached by tightening the output terminal 33. .

The resistor plate 2 has a resistor 6 with a small specific resistance value fixed to the upper surface of the insulating substrate 5 on the left side in FIG. (referred to as a high resistance element 7) are superimposed and electrically connected at their left parts and fixed by a method such as coating.
It becomes stuck.

Reference numeral 9 denotes a metal threaded shaft, which has a threaded portion 9a and a small diameter portion 9b, has a knob 10 attached thereto, is inserted into the case from the front side wall of the case 1, and has the small diameter portion 9b rotatably engaged with the metal fitting 4 from above. ing.

Reference numeral 11 denotes a sliding joint formed by bending a thin metal plate, and its pair of contact portions 11 a and 11 b are in contact with the resistor 2 between the resistor 2 and the screw shaft 5, and the engaging portion 11 C is the screw. It is inserted in a state where it is engaged with the portion 9a and has a spring property itself.

Reference numeral 12 denotes a pointer driver made of resin, which is engaged with the sliding contact 11 within the case 1 across the threaded portion 9a.

A cover plate 13 is attached to the upper surface of the case 1.

Here, assuming that a voltage is now being applied between the input terminal 3□ and the output terminal 3□, the knob 10 is rotated in a predetermined direction.

Then, the sliding contact 11 and the driver 12 start moving in the direction of arrow A from the left end position in FIG. 2, and the movable contact 11a,
llb slides in the same direction along the locus shown by dashed-dotted lines a and l) in FIG. 2, and the input terminal 3
The resistance value between □ and the output terminal 33 is gradually increased, and the output voltage value between the input terminal 31 and the output terminal 33 is variably set accordingly.

In FIG. 5, the increase in the resistance value with respect to the sliding distance of the sliding contact 11 is shown by a characteristic line A.
．． A2 shows a state in which the sliding contact 11 is located behind the low resistance body 6 portion and the high resistance body 7 only portion, respectively.

However, according to the above conventional example, the sliding contact 11 is the low resistance element 6.
When it reaches the end, a jump occurs as shown by the center line A3 in FIG. 5, which is undesirable in terms of characteristics.

In order to eliminate the above-mentioned drawbacks, in another conventional example, as shown in the resistance plate 14 shown in FIG. 3, the end portions of the two types of low-resistance bodies 6 are blurred over a predetermined length as shown by diagonal lines in the figure. There is something.

According to this method, a desired smooth characteristic line B can be obtained as shown in FIG. 6, but on the other hand, there is a drawback that an extra step of the above-mentioned blurring step is required, which increases the cost accordingly.

Still another conventional example is a resistor plate 15 shown in FIG. 4, in which a resistor 16 having a predetermined specific resistance value is placed on the top surface of a substrate 5, and the surface area per unit length gradually decreases as it moves toward the right in the figure. There is a method in which the resistance value is fixed so as to gradually increase (therefore, the resistance value gradually increases) and a smooth characteristic line C as shown in Fig. 7 is obtained, but according to this, only one type of resistance plate 16 is used. Therefore, the characteristic line C is still close to a straight line and cannot be sufficiently approximated to the characteristic line B.

The present invention eliminates the above-mentioned drawbacks, and each embodiment thereof will be described below with reference to the drawings.

FIG. 8 is a plan view of the first embodiment of the resistance plate applied to one embodiment of the variable resistor according to the present invention.
Components that are the same as those in FIG. 4 are given the same reference numerals, and their explanations will be omitted.

In the figure, the resistance plate 21 has a low resistance element 22 having a predetermined length and a width smaller than 5 widths of the substrate fixed to the left center, and a high resistance element 23 on almost the entire surface, and a low resistance element 22 on the left side thereof. They are individually attached in an overlapping and electrically conductive state.

The high resistance element 23 has a resistance non-bonding part (the part where the substrate 5 is exposed) extending over a predetermined length in the center of the right part, and the resistance non-bonding part has a predetermined dimension in the direction of arrow A with the low resistance element 22. They are separated.

Therefore, the high resistance element 23 has a structure in which the surface area per unit length gradually decreases (the resistance value gradually increases) toward the right end.

Therefore, when the sliding contact 11 starts sliding in the direction of the arrow A on the dashed dotted lines a and b from the left end position in FIG. The resistance value gradually increases as shown by line B1, and finally increases sharply as shown by line B2 due to the high resistance body 23 itself and the gradual increase in the resistance value per unit length.

Also, since the contact portions 11a and 11b of the sliding contact 11 are sliding in contact with the high resistance element 23 from beginning to end, the above-mentioned line portion B
1. The joint B2 becomes a smooth line B3, and the desired smooth characteristic line B similar to that shown in FIG. 6 can be obtained as a whole.

Furthermore, the manufacturing process can also be reduced by the soil process compared to the conventional example shown in FIG.

FIG. 10 shows a second embodiment of the above resistance plate.

This resistance plate 24 has a pair of small and medium-sized low resistance elements 25 on both sides on the left side.
is fixed, and a high resistance element 26 is fixed on the entire surface.

Note that this high resistance element 26 has a resistance non-bonded part (the substrate 5 is exposed) extending over a predetermined length on both sides of the right side thereof, and similarly, this resistance non-bonded part is spaced apart from the low resistance element 25 by a predetermined dimension. ing.

Therefore, the resistance characteristics when the sliding contact 11 slides can be considered to be substantially the same as in the case of the configuration shown in FIG. 8, and the resistance characteristics as shown in FIG. 9 are obtained after all.

FIG. 11 shows a third embodiment of the above resistance plate.

The resistance plate 27 has a low resistance element 29 on a U-shaped substrate 28 as shown in the figure.
, a high resistance element 30 is fixed to the substrate 28 with a part thereof exposed, and the entire resistance plate 21 can be regarded as simply bent into a U-shape.

In this case, for example, a pair of contact portions (both not shown) of the slider of the slider whose rotational fulcrum is approximately at the center position of the arc-shaped portion of the resistance plate 27, as shown by dashed lines c and d in the figure. It slides, and the characteristics shown in FIG. 9 are obtained.

FIG. 12 shows a fourth embodiment of the above resistance plate.

Similarly, the resistance plate 31 is made by fixing a low resistance element 32 and a high resistance element 33 to a U-shaped substrate 28 with a part of the substrate 28 exposed, and the exposed parts of the low resistance element 32 and the substrate 28 are provided on the inner circumferential side. ing.

In this case as well, the characteristics shown in FIG. 9 are obtained.

FIG. 13 shows a fifth embodiment of the above resistance plate.

The resistance plate 34 has approximately the same shape as the resistance plate 21 shown in FIG. 8, but the low resistance elements 35 at both ends and the exposed portion of the substrate 5 are made particularly short, and a high resistance element 36 is fixed thereto.

According to this, the contact portions 11 a and 11 b are the low resistance elements 35
Since the sliding range corresponding to only the high resistance element 36 between the exposed parts of the board 5 becomes longer, as shown in FIG. A characteristic line C is obtained that smoothly connects line portions C1, C2, and C3, each of which has a correspondingly increasing slope.

FIG. 14 shows a sixth embodiment of the above resistance plate.

The resistance plate 41 has a pair of low-resistance elements 35 fixed to both ends, and a high-resistance element 42 fixed to the exposed part of the substrate 5 in the center.

According to this, as shown in FIG. 17, the portions where the sliding contact 11 corresponds to the pair of low resistance elements 35 have small slopes as shown by line portions d and d3, respectively, and the exposed portion of the central board 5 In the portion corresponding to , a smooth characteristic line with a large gradient is obtained as shown by line portion d2.

FIG. 15 shows a seventh embodiment of the above resistance plate.

The resistance plate 43 has a pair of substrates 5 exposed at both ends, a low resistance element 35 is fixed to the center, and a high resistance element 44 is fixed thereto.

According to this, in the same manner as in the above case, as shown in FIG. 18, the portion corresponding to the exposed portion of the substrate 5 is the line portion e1. A smooth characteristic line E is obtained in which the slope is large as shown by e3, and the slope is small in the portion corresponding to the central low resistance element 35 as shown by line e2.

That is, each of the above resistance plates 21.24, 27, 31.34, 4
1.43, each of the short dimension low resistance elements 22.
25. The first section corresponding to 29.32.35, the longest dimension of the high resistance body 23° 26.30, 33, 36, 42.4
4, and a third section corresponding to the longest dimension of the high-resistance element (where the substrate 5 is exposed) are provided independently. Since the section is located between the first and third sections and adjacent to each other, the large difference in the rate of change of resistance between the first section and the third section is caused by the intermediate rate of change between them. The resistance change rate in the second section results in a smooth connection,
As shown in FIG. 5, good resistance characteristics without jump portion A3 can be obtained.

Although there are two types of resistors, high resistance and low resistance, three or more types may be used.

Further, the sliding contact 11 may not only be in contact with the resistor at two points, but may be in contact with the resistor at one point or at three or more points.

As described above, the variable resistor of the present invention includes a substrate, a conductive slider disposed above the substrate so as to be slidable, and a conductive slider having different specific resistance values and length dimensions on the upper surface of the substrate. The resistor is formed by adhering a plurality of resistor parts overlapping each other and being electrically conductive. A first section corresponding to the resistance section of the dimension, a second section corresponding only to the resistance section of the longest dimension, and a third section corresponding to the resistance non-attached section of the resistance section of the longest dimension are each independent. Moreover, since the second section is located between the first and third sections and adjacent to each other, there is a large difference in the rate of change in resistance between the first section and the third section. can be connected smoothly by the resistance change rate of the second section having an intermediate change rate between them, and good resistance change rate characteristics without jumps in the change rate can be obtained. Since it contacts only the resistance part, the two adjacent types of resistance change rates are smoothly connected even at the transition points of each slide section, and smooth resistance change characteristics without sudden changes can be obtained, which improves the performance of the device. Therefore, the process of blurring the transition points of the slide sections is unnecessary, and the number of man-hours can be reduced.

[Brief explanation of the drawing]

Figures 1A and 1B are a vertical side view and a front view of a general example of a variable resistor (screw type), respectively, and Figures 2 to 4 are plan views of various conventional examples of resistance plates constituting the variable resistor. Figure, Figure 5~
FIG. 7 is a diagram showing the resistance change characteristics of the resistance plates shown in FIGS. 2 to 4 above with respect to the sliding contact distance, and FIGS. 8 and 9 are diagrams showing one implementation of the variable resistor according to the present invention, respectively. A plan view of one embodiment of the resistor plate constituting the example and a diagram showing its resistance value change characteristics, FIGS. FIG. 15 is a plan view of various other embodiments of the above-mentioned resistance plate, and FIGS. 16 to 18 respectively.
The figure is a diagram showing the resistance value change characteristics of the resistor plates shown in FIGS. 13 to 15 above. 1... Case, 2, 14, 15, 21.24,
27, 31. 34, 41. 43... Resistance plate, 5, 28... Board,
6,22,25,29,32゜35...Low resistance element, 7,23,26,30,33,36,42.44・
... High resistance element, 8 ... Electrode part, 9 ...
... Screw shaft, 11 ... Sliding joint, 11 a, 1
1b...Contact part, 16...Resistor.

Claims (1)

[Scope of utility model registration request] A substrate, a conductive slider disposed above the substrate so as to be slidable, and a plurality of resistor portions each having a different specific resistance value and length dimension on the upper surface of the substrate are adhered to each other in a superimposed and electrically conductive state. The resistance part having the longest dimension is in sliding contact with the slider over its entire sliding range, and the first section corresponding to the resistance part having the short dimension in the sliding direction of the slider has the longest dimension. A second section corresponding only to the resistance section of the longest dimension, and a third section corresponding to the non-resistance section of the longest dimension resistance section, respectively, are made independent, and the second section corresponds to the first and third resistance section. Variable resistors configured to be located in the middle of the sections and adjacent to each other.