JP3083874U - Potentiometer - Google Patents

Abstract

(57) [Problem] To provide a potentiometer having an output characteristic in a wide range in which an output can be regarded as a straight line, and having high output change accuracy depending on a rotation angle. SOLUTION: By rotating a spiral disk-shaped rotor 27 integrally with an operation shaft 26, the rotor 27 moves up and down between coils 28 and 29, whereby the coil 2
It is assumed that the inductances 8 and 29 change and are output as rotation detection signals.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a potentiometer, and particularly to a so-called inductance type non-contact potentiometer.

[0002]

[Prior art]

 First, the structure of a conventional inductance-type non-contact potentiometer will be described with reference to FIGS. 1 is a side view of the potentiometer, FIG. 2 is a longitudinal sectional view, and FIG. 3 is an exploded perspective view.

In FIG. 1, reference numeral 1 denotes a potentiometer as a whole, and reference numeral 2 denotes a case. The case 2 includes a cylindrical case main body 2a and an upper lid 2b and a lower lid 2c mounted on the upper and lower sides thereof. Inside the case 2, a drum-shaped holding body 3 is fixed, and is supported by a bearing 4 installed in the lower center of the holding body 3 and a bearing 5 installed in the center of the upper lid 2 b. In this state, the operation shaft 6 is provided rotatably with respect to the case 2.

A rotor 7 is fixed to the operation shaft 6 inside the case 2. The rotor 7 is a detector for detecting the rotation of the operation shaft 6. Here, the rotor 7 has a cylindrical drum shape, and is fixed in an eccentric state with respect to the rotation axis of the operation shaft 6.

Further, inside the case 2, a pair of coils 8 and 9 are arranged to face each other with a predetermined distance therebetween so as to sandwich the rotor 7 from right and left. Here, the coils 8 and 9 are fixed and held in the case 2 in a state of being fitted into the holder 3.

When the operating shaft 6 is rotated in the potentiometer 1 configured as described above, the rotor 7 rotates integrally with the operating shaft 6. At this time, when the rotor 7 is closest to one coil 8, The coil 9 is rotated so as to have the maximum distance. The rotation of the rotor 7 changes the inductance of the coils 8 and 9, and the change is output from the cord 11 through the circuit board 10 in the case 2 as a rotation detection signal.

[0007]

[Problems to be solved by the invention]

 In the structure of the conventional potentiometer 1 as described above, the output characteristic has the maximum and minimum output peaks at 180 ° rotation, as shown in FIG. 4, due to the positional relationship between the rotor 7 and the coils 8, 9. In this output characteristic, the range in which the output can be regarded as a straight line is narrow, so that the conventional potentiometer has a low output change accuracy depending on the rotation angle, and it is difficult to make fine adjustments. The present invention has been made to solve such a problem.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the potentiometer of the present invention has an operation shaft rotatably supported on a case, a spiral disk fixed to the operation shaft in the case, and integrally rotated with the operation shaft. A rotor and a pair of coils disposed opposite to each other so as to sandwich the rotor from above and below in the case. By rotating the rotor integrally with the operation shaft, the rotor moves up and down between the coils. Is changed and output as a rotation detection signal.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 5 to 7 show the structure of the potentiometer according to the present invention. FIG. 5 is a side view of the potentiometer, FIG. 6 is a longitudinal sectional view, and FIG. 7 is an exploded perspective view.

In FIG. 1, reference numeral 21 denotes a potentiometer as a whole, and reference numeral 22 denotes a case. The case 22 includes a cylindrical case main body 22a, and upper and lower lids 22b and 22c attached to the upper and lower sides thereof. A bearing 25 is incorporated in a boss portion 24 formed at the center of the upper lid 22b. An operation shaft 26 is rotatably provided with respect to the case 22 while being supported by the bearing 25.

A rotor 27 is fixed to the operation shaft 26 inside the case 22. The rotor 27 is a detecting body for detecting the rotation of the operation shaft 26. In particular, in the present invention, the rotor 27 is formed in a disk shape having a helical shape for one round, and the rotor 27 has a fixing member 23 at the center thereof. It is fixed to the operation shaft 26 via a.

Further, inside the case 22, a pair of coils 28 and 29 are opposed to each other with a predetermined distance therebetween so as to sandwich the rotor 27 from above and below. Here, the coils 28 and 29 are fixedly held in the case 22 while being supported by the support 32.

When the operating shaft 26 is rotated in the potentiometer 21 configured as described above, the rotor 27 is rotated integrally with the operating shaft 26, and the rotor 27 in the form of a spiral disk is connected to the coils 28 and 29. Rotated to move up and down between. The rotation of the rotor 27 changes the inductance of the coils 28 and 29, and the change is output from the cord 31 through the circuit board 30 in the case 22 as a rotation detection signal.

In the potentiometer 21 according to the present invention as described above, the output characteristics shown in FIG. 8 can be obtained by the structure using the spiral disk-shaped rotor 27. In other words, in this case, the output characteristic has a maximum and a minimum peak in a wide rotation range of about 300 °, and the output change is more linear, that is, the output characteristic in which the output can be regarded as a linear range is wider than before. It is obtained.

Therefore, the potentiometer 21 according to the present invention has a higher output change accuracy depending on the rotation angle than the conventional one, and allows finer adjustment.

Although the embodiment of the potentiometer according to the present invention has been described above, it is needless to say that the present invention is not limited to the configuration of this embodiment, and can adopt various other embodiments.

[0017]

[Effect of the invention]

 As is clear from the above description, the potentiometer of the present invention makes it possible to obtain a range in which the output can be regarded as a straight line in a wider rotation range than in the past. A highly accurate potentiometer that can be adjusted can be provided.

[Brief description of the drawings]

FIG. 1 is a side view of a conventional potentiometer.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is an output characteristic diagram.

FIG. 5 is a side view of a potentiometer according to the present invention.

FIG. 6 is a longitudinal sectional view of the same.

FIG. 7 is an exploded perspective view of the same.

FIG. 8 is an output characteristic diagram.

[Explanation of symbols]

21 ‥‥ potentiometer, 22 ‥‥ case, 26 ‥‥
Operating shaft, 27 ‥‥ rotor, 28, 29 ‥‥ coil

Claims (1)

[Utility model registration claims] An operation shaft rotatably supported by a case; a helical disk-shaped rotor fixed to the operation shaft in the case and rotated integrally with the operation shaft; And a pair of coils arranged to face each other so as to sandwich the rotor from above and below. By rotating the rotor integrally with the operation shaft, the rotor moves up and down between the coils, thereby A potentiometer that changes the inductance of the coil and outputs it as a rotation detection signal.