JP2001221655A - Contactless variable voltmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactless variable voltmeter, realizing reduction in the number of parts, enhancement of assembling workability, enhancement of the rotation stability of an operation shaft, prevention of the erroneous assembling of a magnet and expansion of the angle of rotation of the operation shaft (magnet). SOLUTION: A bearing part 20 is provided to a case 10, and the operation shaft 30 is supported rotatably by the bearing part 20, the magnet 40 is attached to the inner end part of the operation shaft 30, and a magnetic sensor 60 is arranged in close vicinity to the magnet 40 in counterposed in close range. A hook 31 and a stepped part 33 are provided to the operation shaft 30, and a stepped part 21 and a projected part 22 are provided to the bearing part 20. When the operation shaft 39 is inserted in the bearing part 20, the hook 31 is fitted to the stepped part 31, and the projected part 22 comes into contact with the stepped part 33 to surely support the operation shaft 30 so as not to detach the same from the bearing part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact variable voltage device constituted by a magnet and a magnetic sensor, and more particularly to a variable resistor incorporated in a stick controller or the like used as an input device of a personal computer, a game machine, or the like. The present invention relates to a non-contact variable voltage device used in place of a normal variable resistor.

[0002]

2. Description of the Related Art As such a non-contact variable voltage device, there is a "non-contact variable voltage device" described in Japanese Patent Application Laid-Open No. H11-325956.

In this contactless variable voltage generator, a bearing is fixed at the center of the upper part of the housing, the operating shaft is rotatably supported by the bearing, and the magnet is rotated integrally with the operating shaft at the operating shaft portion in the housing. The magnetic sensor is attached to the magnet, and is opposed to the magnet. The output of the magnetic sensor is changed by a change in magnetic flux due to rotation of the magnet.

The operating shaft has a step formed by partially forming a notch, and a bearing is fitted into the step. Further, inside the housing, an E-ring is fitted into the circumferential groove of the operation shaft along the end of the bearing. Therefore, the operation shaft is securely supported by the step portion and the E-ring so as not to come off the bearing.

[0005]

However, the contactless variable voltage device described in the above publication has the following problems.
There is. An E-ring is used so that the operation shaft does not come off from the bearing fixed to the housing. However, since the E-ring is assembled inside a narrow housing, workability is extremely poor and the number of parts is large. After assembling the operation shaft to the bearing fixed to the housing, the magnet is assembled, so that the operation is performed in a narrow housing, and the workability is extremely poor. Since the fitting between the bearing and the operating shaft is fitted with a gap, the operating shaft is rotated by a small amount of vibration or force, and is not held at a stable rotation position. Since the shape of the magnet is symmetrical with respect to the boundary line between the N pole and the S pole, there is a possibility that the N pole and the S pole are erroneously reversed during assembly, and the output characteristics are reversed. . The operating shaft and the magnet rotate integrally, but since the magnet is divided into two regions at the N pole and the S pole, the rotation angle is 0 to 0.
Only the range of 180 ° (characteristics are reversed beyond 180 °) can be used.

Accordingly, the present invention is directed to such problems.
The focus is on reducing the number of parts, improving assembly workability, improving the rotational stability of the operating shaft, preventing erroneous assembly of the magnet, and increasing the rotational angle of the operating shaft (magnet). An object is to provide a contact variable voltage device.

[0007]

According to a first aspect of the present invention, there is provided a contactless variable voltage generator comprising: a housing; an operating shaft rotatably supported by the housing so as to protrude therefrom; A magnet attached to the operation shaft portion in the housing and rotating integrally with the operation shaft, and a magnetic sensor arranged opposite to the magnet, and the output of the magnetic sensor changes according to a change in magnetic flux due to rotation of the magnet. In the non-contact variable voltage device, the operating shaft is provided with an engaging portion that engages with the housing, the housing is provided with a supporting portion that engages with the engaging portion of the operating shaft to support the operating shaft, and the housing is provided with the operating shaft. A bearing for rotatably supporting the operation shaft is provided.

In this non-contact variable voltage device, when the operating shaft on which the magnet is mounted is inserted into the bearing of the housing, the engaging portion of the operating shaft engages with the supporting portion of the housing, and the operating shaft is rotatably supported. You.

A non-contact variable voltage device according to a third aspect of the present invention is a housing, an operating shaft rotatably supported in a protruding manner on the housing, and an operating shaft mounted on the operating shaft portion in the housing and integrated with the operating shaft. A non-contact variable voltage device, comprising: a magnet that rotates at an angle; and a magnetic sensor that is disposed to face the magnet, wherein the output of the magnetic sensor is changed by a change in magnetic flux due to rotation of the magnet. The operating shaft is provided with a support portion that engages with the engaging portion of the housing to support the operating shaft, and the housing is provided with a bearing portion that rotatably supports the operating shaft. It is characterized by.

This non-contact variable voltage device is different from the above-mentioned voltage device in that an engaging portion is provided on a housing and a support portion is provided on an operation shaft, but is functionally the same. .

In each of these non-contact variable voltage generators, the operation shaft is reliably rotatably supported only by inserting the operation shaft into the bearing portion of the housing, so that the assembling workability is very good and the number of parts is small. Less is needed.

According to a fifth aspect of the present invention, there is provided a non-contact variable voltage device comprising: a magnet rotatably supported; and a magnetic sensor disposed opposite to the magnet, wherein the change in magnetic flux due to the rotation of the magnet causes the magnetic sensor to rotate. In a non-contact variable voltage device that changes output, the magnet has an asymmetric shape with respect to a boundary between an N pole and an S pole passing through the center of rotation.

In this non-contact variable voltage device, since the magnet has an asymmetric shape, it is possible to prevent the assembly from being performed with the wrong polarity.

According to a sixth aspect of the present invention, there is provided a non-contact variable voltage device comprising: a magnet rotatably supported; and a magnetic sensor arranged to face the magnet. In a non-contact variable voltage device that changes output, a magnet shaft rotatably supporting the magnet and an operation shaft for rotating the magnet shaft are separately provided, and the magnet shaft is rotated with respect to the rotation angle of the operation shaft. It is characterized in that the magnet shaft and the operation shaft are connected by a transmission mechanism that adjusts the rotation angle at a fixed ratio.

In this contactless variable voltage device, the rotation angle of the magnet shaft is adjusted at a fixed ratio with respect to the rotation angle of the operation shaft, so that the rotation angle of the operation shaft can be set in a free range (0 to infinity). can do.

In the present invention, any magnetic sensor may be used as long as it can extract a change in the strength of a magnetic field as an electric signal, and may be a Hall element, a magnetic resistance element [for example, a magnetic resistance sensor (MR).
Sensor)].

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.

FIG. 1 is an external perspective view of a non-contact variable voltage generator according to the embodiment, FIG. 2 is a sectional view of a main part thereof, and FIG. FIG. 3A is a side view as viewed from the operation shaft side, and FIG.

In this non-contact variable voltage generator 1A, a housing is composed of a circular case 10 having an open bottom, and a shield cover 11 fitted to the bottom so as to cover the bottom opening of the case 10. The case 10 has a positioning boss 12 used for positioning when assembled in a device using the voltage generator 1A at an upper portion.

At the center of the upper part of the case 10, a bearing 20 is provided so as to project therefrom, and the operating shaft 30 is rotatably supported by the bearing 20. The operation shaft 30 is provided near the center and engages with the inner wall of the bearing portion 20 of the case 10 as shown in FIG. 4 (longitudinal sectional view) and FIG. 5 (a) (left side view of FIG. 4). Hook 31 as an engaging portion to be engaged, and an inner end (left end)
Hooks 32 for mounting the magnets 40 projecting therefrom;
A stepped portion 33 formed in a flange shape near the inner end portion; and a rib 34 for engaging the periphery of the magnet 40 and positioning the magnet 40.
And Each of the hooks 31 and 32 has an appropriate elasticity so as to be displaceable.

In correspondence with the hook 31 of the operating shaft 30,
On the inner wall of the bearing portion 20 of the case 10, a support portion (step portion) 21 that engages with the hook 31 and supports the operation shaft 30 is provided. In addition, a convex portion 22 is provided at an end of the bearing portion 20 in the case 10, and the convex portion 22 contacts the step portion 33 of the operation shaft 30. Therefore, the operating shaft 30 is
Is inserted, the hook 31 of the operating shaft 30 engages with the support portion 21 of the bearing portion 20 and the convex portion 22 of the case 10 comes into contact with the step portion 33 of the operating shaft 30 so that the operating shaft 3
0 is securely supported so as not to come off from the bearing portion 20.
A screw portion 23 for fixing the voltage generator 1A to an input device such as a stick controller with a nut is formed on the outer periphery of the bearing portion 20.

Inside the case 10, a magnet 40 having a shape as shown in FIG. 6A is attached to the inner end of the operation shaft 30, and the magnet 40 rotates integrally with the operation shaft 30. The magnet 40 has a mounting hole 41 at the center thereof.
The hook 32 of the operation shaft 30 is inserted into the
Engages with the peripheral portion of the mounting hole 41, whereby the magnet 40 is integrally mounted on the operation shaft 30. Operation shaft 30 in case 1
When assembling to zero, it is only necessary to first attach the magnet 40 to the operation shaft 30 and then insert the operation shaft 30 from the bottom side of the case 10 into the bearing portion 20, and the workability is very good.

The outer diameter φD of the hook 31 of the operating shaft 30 is larger than the inner diameter φd of the support portion 21 of the case 10, and when the hook 31 is fitted to the support portion 21,
1, the force remains applied in the direction of reducing the outer diameter φD. That is, since the hook 31 constantly presses the support portion 21 due to its elasticity, the operation shaft 30 is prevented from being rotated by a slight vibration or force. Further, as shown in FIG. 7, a cylindrical jig 70 having an inner diameter φD ′ or more and an outer diameter φd or less is inserted along the operating shaft 30 (a portion protruding from the case 10), so that the operating shaft 30 is formed.
Can be easily removed from the bearing portion 20, and maintenance is facilitated.

On the other hand, a printed circuit board 50 is fixed to the case 10 with screws 51 inside the case 10. A magnetic sensor 60 held by a sensor holder 61 and a connector 55 for connecting an external circuit are mounted on one side of the printed circuit board 50, and a magnetic sensor 60 is mounted on the other side.
Various electronic components 56 that constitute a circuit unit or the like that converts an output change into a voltage change are mounted. The magnetic sensor 60 is
The fixing hook 62 is securely fixed to the sensor holder 61, and the hook 62 a is fitted in a hole formed in the printed circuit board 50.

The magnetic sensor 60 faces the outer periphery of the magnet 40 with a slight gap. The magnet 40 is a magnetic sensor 60
Are opposed to each other, and the distance between the facing surface of the magnet 40 and the magnetic sensor 60 is kept constant even when the magnet 40 rotates. The magnetic sensor 60 is connected to the operation shaft 3
0, that is, when the magnet 40 is at the reference position, the magnetic sensing portion is positioned so as to face the boundary between the N pole and the S pole of the magnet 40. In this state, the magnetic sensor 60 detects a magnetic change. No output.

The connector 55 is mounted toward the outside of the case 10 and, for example, a shielded cable or the like is connected thereto.
Note that the magnetic sensor 60 and the printed circuit board 50 may be separately arranged, and both may be connected by a lead wire. The shield cover 11 is made of a magnetic material.
By surrounding the magnet 40 and the magnetic sensor 60 with, the influence of external magnetism is reduced and the leakage of the magnetism of the internal magnet 40 to the outside is reduced.

Next, FIG. 8 is a sectional view of a main part of a non-contact variable voltage device according to another embodiment. However, the same elements as those of the above-described voltage generator 1A are denoted by the same reference numerals.

The voltage generator 1B has basically the same structure as the voltage generator 1A, but differs in the mounting structure of the operation shaft 30 'to the case 10. That is, the case 10 is provided with a hook 15 as an engaging portion that engages with the operation shaft 30 ′.
0 'engages with the hook 15 of the case 10 to operate the operating shaft 30'.
A support portion (flange portion) 35 is provided to support.

In this voltage generator 1B, when the operating shaft 30 'on which the magnet 40 is mounted is inserted into the bearing 20, the case 1
0 engages with the support portion 35 of the operation shaft 30 ', and the convex portion 22 of the case 10
By being in contact with 3, the operation shaft 30 'is reliably supported so as not to come off from the bearing portion 20. Also in this embodiment, after the magnet 40 is attached to the operation shaft 30 ', the operation shaft 30' may be inserted into the bearing portion 20 from the bottom side of the case 10, so that the assembling workability is good.

Since the outer diameter of the support portion 35 of the operation shaft 30 'is larger than the inner diameter of the hook 15 of the case 10,
When the hook 15 is fitted to the support portion 35, a force is applied to the hook 15 in a direction to increase the inner diameter. That is, since the hook 15 constantly presses the support portion 35, the operation shaft 30 'is prevented from being rotated by a slight vibration or force. Further, if the hook 15 is bent outward, the operation shaft 30 'can be easily removed from the bearing portion 20, and maintenance becomes easy.

Next, the non-contact variable voltage generators 1A and 1B
A circuit example according to the magnetic sensor 60 will be described.
FIG. 12 shows a case where a Hall element is used as a magnetic sensor.
This is an example. In the circuit of FIG._CC-V_EEMark between
The applied voltage is the resistance R₁, R_TwoThrough to the Hall element
Flows. If the Hall element has no magnetism, the resistance R_Three, R _Four
No voltage is generated at the output section connected to. this is,
The boundary between the N pole and the S pole of the magnet 40 is
The same applies to the case of facing non-magnetic force. Here, the operation axis 3
When 0 (30 ') rotates and the N pole approaches the Hall element,
Resistance R_FourVoltage on the terminal side of the Hall element connected to
Is the resistance R_ThreeNegative voltage is generated at the terminal connected to
I do. The output voltage of this Hall element is₁Enter
Force, resistance R_FiveOU according to the amplification factor determined by
It is output as a positive voltage from T.

On the contrary, the operation shaft 30 (30 ') rotates,
When the S pole approaches the Hall element, the positive voltage on the terminal side of the connected Hall elements to the resistor R ₃ is a negative voltage terminal of the Hall element is connected to the resistor R ₄ is generated. The output voltage of the Hall element, since the input to the amplifier IC _1, are output as a minus voltage than OUT by an amplification factor determined by the resistor R _5.

In this case, the output of the Hall element with respect to the rotation angle of the operation shaft is linear as shown in FIG. 11, and the output voltage changes in proportion to the rotation angle.

Of course, it is also possible to reverse the detection of the N pole and the S pole by exchanging the output terminals of the Hall element. Also, by inputting reversing the output of the Hall element in positive and negative input of the amplifier IC _1, it is possible to retrieve the reverse output. Note that the variable resistor VR ₁ is
It intended to balance the offset and the Hall element amplifier IC _1, is used to adjust the OUT to 0V when the operating shaft 30 (30 ') is located at the reference position.

Next, regarding the shape of the magnet, FIG. 5 [side view (a), side view (b) of another embodiment, side view (c) of another embodiment, and FIG. Side view (d)] and FIG. 6 [plan view (a) of magnet 40, plan view (b) of another form, plan view (c) of another form, plan view (d) of another form]. explain.

The magnet 40 shown in FIG. 6A is attached to the operation shaft 30 shown in FIG.
Center of the mounting hole 41 for inserting the hook 32 (center of rotation)
Are symmetrical with respect to the boundary line between the N pole and the S pole passing therethrough. In this case, since the magnet 40 can be mounted face down (the north pole and the south pole are in opposite directions), the polarity may be incorrectly reversed during assembly. In order to prevent this, the shape of the magnet 40 is preferably set as follows.

The magnet 40a shown in FIG. 6B is attached to the operation shaft 30a shown in FIG.
By having a small hole 42 different from 1, the shape is asymmetric with respect to the boundary between the N pole and the S pole. Correspondingly, a positioning boss 36 is provided on the operation shaft 30a. For this reason, if the magnet 40a is mounted face down, the magnet 40a cannot be mounted on the positioning boss 36, thereby preventing the polarity from being incorrectly assembled during assembly.

The magnet 40b shown in FIG. 6C is attached to the operation shaft 30b shown in FIG.
Has an extended portion 41a that is partially widened, and thus has an asymmetric shape with respect to the boundary between the N pole and the S pole. Correspondingly, a small hook 3 is attached to the operation shaft 30b.
2a and a large hook 32b are provided. In this case, if the user attempts to mount the magnet 40b face down, the operation shaft 30b
Since the large hook 32b does not enter the mounting hole 41, it is possible to prevent the polarity from being erroneously assembled during assembly.

The magnet 40c shown in FIG. 6D is attached to the operating shaft 30c shown in FIG. 5D, and has a cutout 43 so that the magnet 40c is located at the boundary between the N pole and the S pole. It has an asymmetrical shape to it. Correspondingly, a positioning boss 37 is provided on the operation shaft 30c. Therefore, when the magnet 40c is to be mounted face down, the magnet 4c
Since 0c cannot be attached to the positioning boss 37, it can be prevented that the polarity is incorrectly assembled at the time of assembly.

The contactless variable voltage device 1 according to the above embodiment
FIGS. 9A and 9B show a state in which a magnet 40 is attached to the inner end of the operation shaft 30. FIG. 9 is a cross-sectional view of a main part of a non-contact variable voltage device according to another embodiment, with a shield cover removed. FIG. 10A is a side view of the housing as viewed from the bottom side of the housing.
FIG. 10B shows a side view as viewed from the operation shaft side.

In the voltage generator 1C, the magnet 40 is
It is not attached to 0 ", but is attached to a magnet shaft 80 provided separately from the operation shaft 30". The magnet shaft 80 is rotatably supported by a bearing 17 provided in the case 10,
A hook 81 for fixing the case 10, a hook 82 for attaching the magnet 40, and a spur gear 83 are provided. The hook 81 of the magnet shaft 80 can be engaged with the engaging portion (step portion) 18 of the case 10. The magnet shaft 80 is connected to the hook 82 as described above.
When the magnet 40 is attached to the bearing 17 after the magnet 40 is attached, the hook 81 fits into the engaging portion 18 and the inner end of the bearing 17 comes into contact with the spur gear 83 (step portion). 17 is securely supported so as not to come off.

The operation shaft 30 ″ is connected to the spur gear 83 of the magnet shaft 80.
, And the projection 22 of the case 10 abuts on the spur gear 83 (step). Therefore, similarly to the above, the operating shaft 30 ″ is moved by the engagement between the hook 31 and the support portion 21 and the abutment between the spur gear 38 and the convex portion 22.
It is securely supported so that it does not come off. Here, the transmission mechanism connecting the operating shaft 30 ″ and the magnet shaft 80 is the operating shaft 3
It is composed of a spur gear 38 of 0 ″ and a spur gear 83 of the magnet shaft 80.

The rotation of the operation shaft 30 ″ is transmitted to the magnet shaft 80 by meshing the spur gear 38 and the spur gear 83, and
The magnet 40 rotates with the rotation of. Here, the spur gears 38 and 83 have the number of teeth of the spur gears 38 and 83 so as to adjust (enlarge or reduce) the rotation angle of the magnet shaft 80 at a fixed ratio with respect to the rotation angle of the operation shaft 30 ″. That is, the rotation angle of the operation shaft 30 "and the rotation angle of the magnet shaft 80 can be freely set by combining spur gears having an appropriate pitch circle diameter, module, and number of teeth. . For example, the spur gears 38 and 83 have 20, 40 teeth, respectively.
If the module is 0.25, the pitch circle diameters are (number of teeth 20 × module 0.25 = 5 mm) and (number of teeth 40 × module 0.25 = 10 mm), respectively, and the operating shaft 30 ″ (spur gear 38) The rotation angle of the magnet shaft 80 (the spur gear 83) is (0-18
0 °) × (number of teeth 40 ÷ number of teeth 20) = (0 to 360 °).

In the voltage generator 1C, two spur gears 38 and 83 are used as a transmission mechanism. However, a transmission mechanism using a plurality of spur gears, helical gears, and internal gears,
A friction transmission mechanism such as a roller, a wrapping transmission mechanism using a belt or the like may be used.

[0045]

The contactless variable voltage device of the present invention has the following effects because it is configured as described above. (1) According to the first and third aspects, when the operating shaft on which the magnet is mounted is inserted into the bearing of the housing, the engaging part of the operating shaft engages with the supporting part of the housing. In this case, since the engaging portion of the housing engages with the support portion of the operation shaft, and the operation shaft is rotatably supported in each case, the assembling workability is very good, and the number of parts can be reduced. Further, by bending the engaging portion from the outside with a jig, the operating shaft can be easily removed from the bearing portion, and maintenance is easy. (2) In the configuration of the second and fourth aspects, when the engaging portion is fitted to the support portion, a constant force is applied to the operation shaft, that is, the operation shaft is reliably supported by the bearing portion. Therefore, it is possible to prevent the operation shaft from being rotated by a little vibration or force. (3) In the configuration of claim 5, since the magnet has an asymmetric shape with respect to the boundary between the N pole and the S pole passing through the center of rotation, it is possible to prevent the magnet from being attached to the operation shaft with the wrong polarity. . (4) In the configuration of claims 6 and 7, since the rotation angle of the magnet shaft is adjusted (enlarged or reduced) at a fixed ratio with respect to the rotation angle of the operation shaft, the rotation angle of the operation shaft is set in a free range. can do.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a non-contact variable voltage device according to one embodiment.

FIG. 2 is a cross-sectional view of a main part of the voltmeter of FIG.

FIG. 3 is a side view (a) viewed from the housing bottom side and a side view (b) viewed from the operation shaft side of the voltage generator of FIG. 1 with a shield cover removed.

FIG. 4 is a longitudinal sectional view of an operation shaft used in the voltage generator of FIG. 1;

5A is a left side view of the operation shaft of FIG. 4, FIG. 5B is a side view of an operation shaft according to another embodiment, FIG. 5C is a side view of an operation shaft according to another embodiment, and FIG. Side view of operation shaft (d)
It is.

6A is a plan view of a magnet used in the voltage generator of FIG. 1, FIG. 6B is a plan view of a magnet according to another embodiment, FIG. 6C is a plan view of a magnet according to another embodiment, and FIG. FIG. 5D is a plan view of the magnet according to FIG.

FIG. 7 is a sectional view of a jig used to remove an operation shaft.

FIG. 8 is a sectional view of a main part of a non-contact variable voltage device according to another embodiment.

FIG. 9 is a sectional view of a main part of a non-contact variable voltage device according to still another embodiment.

10 is a side view (a) as viewed from the bottom side of the housing and a side view (b) as viewed from the operation shaft side of the voltage generator of FIG. 9 with a shield cover removed.

FIG. 11 is a graph showing a relationship between a rotation angle of an operation shaft and an output voltage of a magnetic sensor.

FIG. 12 is a circuit example in the case where a Hall element is used as a magnetic sensor and the rotation angle of an operation shaft is output in analog form.

[Explanation of symbols]

 Reference Signs List 1 (A to C) Non-contact variable voltage generator 10 Case (housing) 11 Shield cover (housing) 15 Hook (engagement part) 20 Bearing part 21 Step part (support part) 30 (', ") Operation shaft 31 Hook ( Engagement part) 35 Flange part (support part) 38 Spur gear (transmission mechanism) 40 Magnet 60 Magnetic sensor 80 Magnet shaft 83 Spur gear (transmission mechanism)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F077 AA25 AA27 AA43 AA46 AA49 JJ01 JJ08 JJ23 NN18 PP12 TT06 TT12 VV02 VV10 VV13 VV14 VV31 5B087 AA02 AA04 BC02 BC12

Claims (7)

[Claims] 1. A housing, an operating shaft rotatably supported by the housing so as to protrude therefrom, a magnet attached to an operating shaft portion in the housing and rotating integrally with the operating shaft, and opposed to the magnet. A non-contact variable voltage device, comprising: a magnetic sensor disposed therein, wherein the output of the magnetic sensor is changed by a change in magnetic flux due to rotation of the magnet. A non-contact variable voltage device comprising: a support portion that engages with an engagement portion of a shaft to support an operation shaft; and a bearing portion that rotatably supports the operation shaft is provided in the housing. 2. The non-contact variable voltage device according to claim 1, wherein the engaging portion of the operation shaft has elasticity for constantly pressing the support portion of the housing. 3. A housing, an operation shaft rotatably supported by the housing so as to protrude therefrom, a magnet mounted on an operation shaft portion in the housing and rotating integrally with the operation shaft, and a magnet opposed to the magnet. A non-contact variable voltage device comprising: a magnetic sensor disposed therein, wherein the output of the magnetic sensor is changed by a change in magnetic flux due to rotation of the magnet. A non-contact variable voltage device, comprising: a support portion that engages with an engagement portion of a housing to support the operation shaft; and a bearing portion that rotatably supports the operation shaft is provided in the housing. 4. The non-contact variable voltage device according to claim 3, wherein the engaging portion of the housing has elasticity for constantly pressing the support portion of the operation shaft. 5. A non-contact variable voltage device comprising: a rotatably supported magnet; and a magnetic sensor arranged to face the magnet, wherein the output of the magnetic sensor is changed by a change in magnetic flux due to rotation of the magnet. The non-contact variable voltage device, wherein the magnet has an asymmetric shape with respect to a boundary between an N pole and an S pole passing through the center of rotation. 6. A non-contact variable voltage device comprising: a rotatably supported magnet; and a magnetic sensor arranged to face the magnet, wherein the output of the magnetic sensor is changed by a change in magnetic flux due to rotation of the magnet. A magnet shaft rotatably supporting the magnet, and an operation shaft for rotating the magnet shaft provided separately, and a transmission for adjusting the rotation angle of the magnet shaft at a fixed ratio with respect to the rotation angle of the operation shaft. A non-contact variable voltage device wherein a magnet shaft and an operation shaft are connected by a mechanism. 7. The transmission mechanism comprises a first spur gear provided on an operating shaft, and a second spur gear provided on a magnet shaft and meshing with the first spur gear. The non-contact variable voltage device according to claim 6, wherein