JPH073601Y2 - Rotation type dual variable resistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is designed to enable resistance value adjustment by two sliders sliding on two concentric resistance patterns to be performed in synchronization with each other. The present invention relates to a rotary operation type double variable resistor used as an operation knob for collectively adjusting the volume of a front speaker and a rear speaker in an audio device.

[Prior Art] A conventional example of a double variable resistor of this type will be described with reference to FIG.

In the figure, on the substrate 1, an outer resistance pattern 2 which is concentrically wide centered on a point O and an inner resistance pattern 3 which is narrower than the outer resistance pattern 2 are formed. That is, these two resistance patterns 2 and 3 are set so that the resistance values per unit angle centered on the point O are equal, and the widths of the outer and inner resistance patterns 2 and 3 are W and W, respectively. w, point O
If the distance from is L, l, then the relation L / W ＝ l / w holds. A part of the first slider 4 is brought into surface contact with the outer resistance pattern 2, and the inner resistance pattern 3 has substantially the same shape as that of the first slider 4 and has a shape similar to that of the second slider 5. The parts are brought into surface contact with each other, and the first and second sliders 4, 5
Has their relative positions defined so that the respective surface contact portions 4a, 5a and the point O are aligned on a straight line, and is then held and fixed in a cantilever manner on a slider receiver (not shown). This slider holder is
Since it is rotatable integrally with the rotation shaft 6 and its rotation center coincides with the point O, the surface contact portions 4a, 5a are arranged in parallel in the rotation radius direction of the slider receiver. Will be there. Therefore, when the slider receiver is rotated, both contact portions 4a and 5a of the first and second sliders 4 and 5 synchronize the outer resistance pattern 2 and the inner resistance pattern 3 with each other. Then, the outer circuit resistance and the inner circuit resistance can always be set to substantially the same value via both the sliders 4 and 5.

[Problems to be Solved by the Invention] Strictly speaking, such a rotary operation type double variable resistor is located at one end of the surface contact portions 4a, 5a of the first and second sliders 4,5. Therefore, in the case of the conventional product described above, even if the surface contact portions 4a, 5a are arranged in parallel in the radial direction of rotation of the slider receiver, the resistance of the outer side and the resistance of the inner side are There was an inconvenience that an interlocking error would occur. For example, when the arrow B direction in FIG. 2 is the increasing direction of the circuit resistance, one end 4 of each surface contact portion 4a, 5a on the opposite arrow B direction side.
Since the actual resistance value is determined by the positions of b and 5b, the outside circuit resistance becomes slightly larger than the inside circuit resistance.

The present invention has been made in view of such circumstances, and an object thereof is to provide a rotary operation type dual variable resistor in which the interlocking error is eliminated and the adjustment accuracy is improved.

[Means for Solving the Problems] In order to achieve the above object, the present invention slides a surface contact portion of a first slider that slides on an outer resistance pattern on an inner resistance pattern. By forming the surface contact portion of the second slider by a predetermined amount, the angles formed by both ends of each surface contact portion with respect to the rotation center of the slider receiver are set to be equal.

[Operation] If the surface contact portion of the outer first slider is formed to be longer than the surface contact portion of the inner second slider by a predetermined amount, in other words, the latter is formed shorter than the former by a predetermined amount. , When these surface contact parts are arranged in parallel in the radial direction of rotation of the slider receiver, the relative position can be specified so that both ends of each surface contact part are also aligned with the center of rotation, increasing the circuit resistance. The interlocking error can be avoided regardless of whether the direction is forward or reverse.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is for explaining a rotary operation type double variable resistor according to an embodiment of the present invention, and the portions corresponding to those in FIG. 2 are designated by the same reference numerals.

The double variable resistor shown in FIG. 1 has a wide outer resistance pattern 2 and a narrower inner resistance pattern 3 on a substrate 1.
Are formed on concentric circles, and these two resistance patterns 2 and 3 are set so that the resistance values per unit angle centered on the point O are equal. Also, the surface contact parts 4a, 5
The first and second sliders 4 and 5 are held and fixed in a cantilever manner on the slider receiver in a state where a is arranged in parallel in the radial direction of rotation of the slider receiver (not shown). , The rotary shaft 6
The surface contact portions 4a and 5a are slid on the outer resistance pattern 2 and the inner resistance pattern 3 in synchronism with each other by being integrally rotated. Then, the outer surface contact portion 4a is formed to be longer than the inner surface contact portion 5a by a predetermined amount, and with respect to the point O which is also the rotation center of the slider receiver,
The angle formed by both ends of the surface contact portion 4a is the same as the angle formed by both ends of the surface contact portion 5a, in other words, the relative positions of both ends of each surface contact portion 4a, 5a are aligned with the point O, respectively. The relationship has been set.

Therefore, when the increasing direction of the circuit resistance is in the direction of arrow B,
There is no relative deviation in the positions of the ends 4b, 5b of the double-sided contact portions 4a, 5a that determine the resistance value, so that an interlocking error can be avoided, and
Even when the direction of increase in the circuit resistance is in the direction of arrow C, the interlocking error can be avoided by eliminating the relative deviation in the positions of the other ends 4c, 5c of the double-sided contact portions 4a, 5a that determine the resistance value. As a result, the outer circuit resistance and the inner circuit resistance can always be set to the same value regardless of whether the increasing direction of the circuit resistance is forward or reverse, and the adjustment accuracy is remarkably high.

[Effects of the Invention] As described above, according to the present invention, the second slider in which the surface contact portion of the first slider that slides on the outer resistance pattern slides on the inner resistance pattern. The surface contact portions are formed by a predetermined length and the angles formed by the ends of each surface contact portion with respect to the center of rotation of the slider receiver are set equal. By arranging them in parallel in the radial direction of rotation of the pedestal bearing, interlocking errors can be avoided regardless of whether the direction of increase in circuit resistance is forward or reverse, and a rotary operation type dual variable resistor with high adjustment accuracy is provided. Can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory view of a rotary operation type dual variable resistor according to an embodiment of the present invention, and FIG. 2 is an explanatory view of a rotary operation type dual variable resistor according to a conventional example. 1 ... Substrate, 2 ... Outer resistance pattern, 3 ... Inner resistance pattern, 4 ... First slider, 4a ... Surface contact part, 5 ...
… Second slider, 5a …… Surface contact part, 6 …… Rotating shaft.

Claims (1)

[Scope of utility model registration request] 1. A resistance substrate in which an outer resistance pattern and an inner resistance pattern are concentrically formed, a first slider partly in surface contact with the outer resistance pattern, and a first slider for the inner resistance pattern. A second slider whose surface is in surface contact,
A slide which is rotatable with respect to the resistance substrate and holds both of the first and second sliders in a state in which the surface contact portions are arranged in parallel in the radial direction of rotation. A child bridge is provided, and the surface contact portions of the first and second sliders slide in synchronization with each other on the outer resistance pattern and the inner resistance pattern by rotating the slider support. In the rotary operation type double variable resistor, the slider contact is formed by forming the surface contact portion of the first slider longer than the surface contact portion of the second slider by a predetermined amount. A rotary operation type dual variable resistor in which angles formed by both ends of each surface contact portion with respect to the rotation center of are set to be equal.