JP6406435B2 - Rotary electronic components and rotary encoders - Google Patents

Description

  The present invention relates to a rotary electronic component and a rotary encoder.

  Conventionally, as a rotary encoder as an example of a rotary electronic component, for example, there is one described in Japanese Patent Laid-Open No. 2004-95242 (Patent Document 1). The rotary encoder of Patent Document 1 includes a shaft, a regulating member that regulates the rotational angle of the shaft, an encoder mechanism that detects the rotational direction and rotational angle of the shaft, and a switch mechanism that is pressed against the shaft.

  In Patent Document 1, an encoder mechanism includes an encoder substrate on which an electrode pattern is formed, a rotor attached to a shaft, and a slider attached to the lower surface of the rotor. The slider is an electrode pattern. And slid. The restricting member restricts the rotation angle of the shaft in contact with the outer peripheral surface of the rotor.

JP 2004-95242 A

  However, in the conventional rotary encoder, when the rotor and the regulating member slide, the wear material of the rotor material and / or the regulating member is generated. And abrasion powder penetrate | invades into an encoder board | substrate, obstructs a contact with an electrode pattern and a slider, and may deteriorate an electrical property.

  Accordingly, an object of the present invention is to provide a rotary electronic component and a rotary encoder capable of preventing deterioration of electrical characteristics even when wear powder is generated by a regulating member that regulates the rotation angle of a shaft. .

In order to solve the above problems, the rotary electronic component of the present invention is
A shaft,
A shaft rotation detection mechanism that holds the shaft in a state of insertion so as to be rotatable and vertically movable, and detects a rotation direction and a rotation angle of the shaft, and is attached to the shaft so as to be rotatable integrally with the shaft. The shaft rotation detection mechanism having a rotor, a slider attached to the rotor, and a fixed contact member with which the slider slidably contacts,
A regulating member provided on the opposite side of the fixed contact member across at least one isolation wall and regulating the rotation angle of the shaft;
And a switch mechanism that is pressed by an end portion of the shaft inserted through the shaft rotation detection mechanism.

According to the rotary electronic component of the present invention, even if wear powder is generated from the regulating member that regulates the rotation angle of the shaft, the regulating member is on the opposite side of the fixed contact member with at least one isolation wall interposed therebetween. Since it is provided, the isolation wall can prevent the wear powder from entering. As a result, it is possible to prevent the abrasion powder from obstructing the contact between the electrode pattern and the slider, and thus it is possible to prevent the electrical characteristics of the rotary electronic component from deteriorating.

The rotary encoder of the present invention is
A shaft,
An encoder mechanism for holding the shaft rotatably and vertically movable in an inserted state and detecting a rotation direction and a rotation angle of the shaft, the rotor being attached to the shaft so as to be rotatable integrally with the shaft And a slider attached to the rotor, and the encoder mechanism having a fixed contact member in sliding contact with the slider,
A regulating member provided on the opposite side of the fixed contact member across at least one isolation wall and regulating the rotation angle of the shaft;
And a switch mechanism that is pressed by an end of the shaft inserted through the encoder mechanism.

According to the rotary encoder of the present invention, even if abrasion powder is generated from the regulating member that regulates the rotation angle of the shaft, the regulating member is provided on the opposite side of the fixed contact member with at least one isolation wall interposed therebetween. Therefore, the isolation wall can prevent the wear powder from entering. As a result, it is possible to prevent the abrasion powder from obstructing the contact between the electrode pattern and the slider, thereby preventing deterioration of the electrical characteristics of the encoder.

  In one embodiment, the encoder mechanism includes a substrate, the fixed contact member is a resistor pattern provided on the substrate, and the substrate also serves as one of the at least one isolation wall. Good.

  According to the embodiment, since the substrate also serves as the isolation wall, it is not necessary to separately provide an isolation wall in the encoder mechanism. Therefore, the encoder mechanism can be downsized and the rotary encoder can be further downsized.

  According to the rotary electronic component and the rotary encoder of the present invention, it is possible to prevent deterioration of electrical characteristics even if wear powder is generated in the regulating member.

It is the perspective view seen from the upper part of the rotary encoder as a rotary electronic component of one Embodiment of this invention. It is the perspective view seen from the downward direction of a rotary encoder. It is a disassembled perspective view seen from the upper direction of a rotary encoder. It is the disassembled perspective view seen from the downward direction of the rotary encoder. It is sectional drawing of a rotary encoder. It is an exploded perspective view seen from the lower part of an encoder mechanism. It is the perspective view seen from the downward direction of an encoder mechanism. It is a circuit diagram which shows the equivalent circuit of an encoder mechanism. It is a wave form diagram which shows the output waveform of an encoder mechanism.

Hereinafter, the present invention will be described in more detail with reference to the drawings.
The rotary electronic component according to the present invention is a shaft and a shaft rotation detection mechanism that detects the rotation direction and the rotation angle of the shaft while holding the shaft in an inserted state so as to be rotatable and vertically movable. A rotor attached to the shaft so as to rotate integrally therewith, a slider attached to the rotor, a shaft rotation detecting mechanism having a fixed contact member in sliding contact with the slider, and at least one isolation A regulating member that is provided on the opposite side of the fixed contact member across the wall and regulates the rotation angle of the shaft, and a switch mechanism that is pressed by the end of the shaft that is inserted through the shaft rotation detection mechanism. It is characterized by having.

  Here, the fixed contact member used for the rotary electronic component of the present invention is a fixed contact member, and is a contact member that a slider that rotates together with the shaft is in sliding contact with. The fixed contact member may be a conductive member having various shapes provided on a support such as a substrate, for example, a resistor pattern, or the fixed contact member itself may also serve as a support. . In the following embodiments, an example in which a resistor pattern is used for a fixed contact member will be described.

  FIG. 1 is a perspective view of a rotary encoder as an example of a rotary electronic component according to an embodiment of the present invention as viewed from above. FIG. 2 is a perspective view of the rotary encoder as viewed from below. FIG. 3 is an exploded perspective view of the rotary encoder as viewed from above. FIG. 4 is an exploded perspective view of the rotary encoder as viewed from below. FIG. 5 is a cross-sectional view of the rotary encoder.

  In each figure, the width direction of the rotary encoder is the X direction, and the length direction of the rotary encoder is the Y direction. The height direction of the rotary encoder is taken as the Z direction. The positive direction in the Z direction is the upper side, and the negative direction in the Z direction is the lower side.

  As shown in FIGS. 1 to 5, the rotary encoder 1 includes a casing 2, a shaft 3 having a rotation axis and movable along the rotation axis, and a regulating member 5 that regulates the rotation angle of the shaft 3. The encoder mechanism 6 detects the rotation direction and the rotation angle of the shaft 3, and the switch mechanism 7 is pressed against the shaft 3 by the movement along the rotation axis of the shaft 3. The restriction member 5, the encoder mechanism 6, and the switch mechanism 7 are arranged in order from the upper side to the lower side along the axis of the shaft 3.

  The casing 2 is made of metal, for example. The casing 2 integrally assembles the shaft 3, the regulating member 5, the encoder mechanism 6, and the switch mechanism 7.

  The casing 2 includes an upper wall 21, side walls 22, 22 provided on both sides of the upper wall 21 in the X direction and extending downward, and a protruding wall provided in the positive direction of the upper wall 21 in the Y direction and extending downward. 23 and a protruding piece 24 provided in the negative direction of the upper wall 21 in the Y direction and extending downward. The upper wall 21 has a hole 21a. The side wall 22 has a hole 22a on the lower side and a groove 22b on the upper side. On the inner surface of the hole 22a, a locking portion 22c that protrudes inside the casing 2 is provided. The protruding wall 23 extends over the entire length of the upper wall 21 in the X direction. The projecting piece 24 is provided at the center of the upper wall 21 in the X direction.

  The shaft 3 is made of, for example, resin. The shaft 3 includes an operation portion 35, a gear-shaped outer peripheral surface 30, and an end portion 36. The operation part 35, the gear-shaped outer peripheral surface 30, and the end part 36 are arranged in order from the upper side to the lower side along the rotation axis. The operation unit 35 has a notch that serves as a mark for the rotation of the shaft 3. The gear-shaped outer peripheral surface 30 includes a plurality of convex portions 31 and concave portions 32. The plurality of convex portions 31 and concave portions 32 are alternately arranged in the circumferential direction. The operation unit 35 penetrates the hole 21 a of the upper wall 21 of the casing 2, and the user can operate the operation unit 35 from the outside of the casing 2.

  The regulating member 5 is made of metal, for example. The regulating member 5 is a leaf spring, for example. The regulating member 5 has a first contact portion 51 and a second contact portion 52 that can come into contact with the outer peripheral surface 30 of the shaft 3. The first contact portion 51 and the second contact portion 52 are elastically biased to contact the convex portion 31 of the outer peripheral surface 30 of the shaft 3, while being fitted in the concave portion 32 of the outer peripheral surface 30 of the shaft 3. Regulate the rotation angle. The first contact portion 51 and the second contact portion 52 are configured to be bent. The 1st contact part 51 and the 2nd contact part 52 exist in the position which opposes substantially. That is, the first contact portion 51 and the second contact portion 52 are located on the same straight line including the rotation center of the shaft 3. Here, the regulating member is provided on the opposite side of the resistor pattern across at least one isolation wall, and regulates the rotation angle of the shaft. The isolation wall has a function of isolating the resistor pattern and the regulating material and preventing the wear powder from entering the resistor pattern side. In the present embodiment, an example in which an encoder substrate described later is used as at least one separating wall will be described, but various insulating materials, for example, one or a plurality of insulating sheets described later can be used.

  As shown in the figure, the regulating member 5 is provided on the opposite side of the resistor patterns 61, 62, 63 with the encoder substrate 60 interposed therebetween. Thereby, even if abrasion powder is generated from the outer circumferential surface 30 of the shaft 3 due to contact between the regulating member 5 and the outer circumferential surface 30 of the shaft 3, the abrasion powder is blocked by the encoder substrate 60, and the resistor pattern 61, Does not enter the 62, 63 side. Accordingly, it is possible to prevent the electrical characteristics of the encoder mechanism 6 from being deteriorated by the wear powder. In the present embodiment, since the first contact portion 51 and the second contact portion 52 are at substantially opposite positions, the frictional force caused by the contact between the regulating member 5 and the outer peripheral surface 30 of the shaft 3 is the first contact portion. It occurs more evenly than when 51 and the second contact portion 52 do not face each other. Thereby, generation | occurrence | production of abrasion powder can be suppressed compared with the case where the 1st contact part 51 and the 2nd contact part 52 do not oppose.

  The encoder mechanism 6 holds the shaft 3 in an inserted state so as to be rotatable and vertically movable, and detects the rotation direction and rotation angle of the shaft 3, and includes resistor patterns 61, 62, 63 and the resistor pattern 61. , 62, 63, an encoder board 60 having encoder terminals 601, 602, 603, a rotor 65 attached to the shaft 3 so as to be rotatable together with the shaft 3, and a resistance attached to the rotor 65. The body pattern 61, 62, 63 and the slider 66 that is in sliding contact are provided.

  The encoder board 60 is made of resin, for example. A concave portion 60a is provided on the upper surface of the encoder substrate 60, and the regulating member 5 is fitted in the concave portion 60a. Protrusions 60b are provided on both sides of the encoder board 60 in the X direction. The protrusion 60 b is fitted in the groove 22 b of the side wall 22 of the casing 2. Both sides of the encoder board 60 in the Y direction are sandwiched between the protruding wall 23 and the protruding piece 24. Thus, the encoder board 60 is fixed to the casing 2 by the groove 22b of the side wall 22, the protruding wall 23, and the protruding piece 24. In other words, the groove portion 22 b of the side wall 22, the protruding wall 23, and the protruding piece 24 constitute an encoder fixing portion that fixes the encoder board 60. In the center of the encoder board 60, a hole 64 serving as an insertion hole for holding the shaft 3 in an inserted state is formed.

  The resistor patterns 61, 62, and 63 are provided on the lower surface of the encoder substrate 60. The resistor patterns 61, 62, and 63 are for detecting the rotation direction and rotation angle of the shaft 3. The first resistor pattern 61, the second resistor pattern 62, and the third resistor pattern 63 are formed in an annular shape and arranged concentrically. The first resistor pattern 61, the second resistor pattern 62, and the third resistor pattern 63 are sequentially arranged from the outer side to the inner side in the radial direction. The first resistor pattern 61 and the second resistor pattern 62 are formed at intervals in the circumferential direction. The third resistor pattern 63 is formed continuously.

  The encoder terminals 601, 602, and 603 are insert-molded on the encoder substrate 60. The first encoder terminal 601 is electrically connected to the first resistor pattern 61, the second encoder terminal 602 is electrically connected to the second resistor pattern 62, and the third encoder terminal 603 is a third resistor. The body pattern 63 is electrically connected.

  The rotor 65 is positioned in the circumferential direction with respect to the shaft 3 and can move in the axial direction. More specifically, the rotor 65 has a D-shaped hole 65a. The outer peripheral surface of the end portion 36 of the shaft 3 is formed in a D shape. The D-shaped end portion 36 is fitted into the D-shaped hole 65a, so that the rotor 65 is fixed to the shaft 3 in the circumferential direction and is not fixed in the axial direction.

  The rotor 65 is formed in a substantially oval shape. The rotor 65 has a long diameter portion 651 in which the outer diameter of the rotor 65 is a long diameter, and a short diameter portion 652 in which the outer diameter of the rotor 65 is a short diameter. The length of the long diameter portion 651 is larger than the gap between the locking portions 22c of the opposite side walls 22, and the length of the short diameter portion 652 is smaller than the gap between the locking portions 22c of the opposite side walls 22. . In other words, the locking portion 22 c is configured such that the short diameter portion 652 is detached without locking and the long diameter portion 651 can be engaged and disengaged by the rotation of the rotor 65.

The slider 66 is made of metal, for example. The slider 66 is fixed to the two protrusions 65 b on the upper surface of the rotor 65. The slider 66 is formed in an annular shape. The slider 66 has a first contact portion 661, a second contact portion 662, and a third contact portion 663. The first contact portion 661, the second contact portion 662, and the third contact portion 663 are sequentially arranged from the outer side to the inner side in the radial direction. The first contact part 661, the second contact part 662, and the third contact part 663 are electrically connected. The first contact portion 661 can contact the first resistor pattern 61, the second contact portion 662 can contact the second resistor pattern 62, and the third contact portion 663 can contact the third resistor pattern 63. It becomes possible to contact.

  The switch mechanism 7 includes a switch board 70, first to third switch terminals 701, 702, and 703 provided on the switch board 70, and a conductor provided on the switch board 70 and pressed against the end portion 36 of the shaft 3. 71. The conductor 71 is electrically connected to the first and second switch terminals 701 and 702. The conductor 71 is pressed by the end portion 36 of the shaft 3 and is electrically connected to the third switch terminal 703 to conduct the first and second switch terminals 701 and 702 and the third switch terminal 703. When the first and second switch terminals 701 and 702 are electrically connected to the third switch terminal 703, the switch signal is turned on. For example, each function operates when the switch signal is turned on. Note that only one of the first and second switch terminals 701 and 702 may be provided.

  Protrusions 70b are provided on both sides of the switch board 70 in the X direction. The protrusion 70 b is fitted in the hole 22 a of the side wall 22 of the casing 2. As described above, the switch board 70 is fixed to the casing 2 by the hole 22 a of the side wall 22. In other words, the hole 22 a of the side wall 22 constitutes a switch fixing portion that fixes the switch substrate 70.

  A step portion 70 c is provided on one side in the X direction on the lower surface of the switch substrate 70. End portions of the bent encoder terminals 601, 602, and 603 are locked to the stepped portion 70c. That is, the encoder board 60 and the switch board 70 are integrally held by the bent encoder terminals 601, 602, and 603.

  The depth of the stepped portion 70c is deeper than the thickness of the encoder terminals 601, 602, 603. Thereby, when the lower surface of the switch substrate 70 is installed on the mounting substrate, the lower surface of the switch substrate 70 can be used as the installation surface instead of the encoder terminals 601, 602, and 603.

  The first to third switch terminals 701, 702 and 703 are insert-molded on the switch board 70. The third switch terminal 703 is located between the first switch terminal 701 and the second switch terminal 702.

  The conductor 71 has elasticity. The conductor 71 is formed in a dome shape. The conductor 71 is fitted in the recess 70 a on the upper surface of the switch substrate 70.

A peripheral portion 71 a of the conductor 71 is electrically connected to the first and second switch terminals 701 and 702. The zenith portion 71 b of the conductor 71 is separated from the third switch terminal 703 in the free state of the conductor 71, while being pressed by the end portion 36 of the shaft 3 penetrating the encoder mechanism 6 and electrically connected to the third switch terminal 703. Connected.

  That is, when the shaft 3 is pressed downward, the end portion 36 of the shaft 3 presses the zenith portion 71 b of the conductor 71, and the zenith portion 71 b of the conductor 71 is electrically connected to the third switch terminal 703. Is done. As a result, the first and second switch terminals 701 and 702 and the third switch terminal 703 are electrically connected, and the switch signal is turned on.

  On the other hand, when the downward pressing of the shaft 3 is released, the conductor 71 returns to the free state, so that the shaft 3 moves upward, and the zenith portion 71b of the conductor 71 is separated from the third switch terminal 703. . As a result, the first and second switch terminals 701 and 702 and the third switch terminal 703 are not electrically connected, and the switch signal is turned off.

  Here, the rotor 65 (slider 66) is located closer to the switch mechanism 7 (lower side) than the resistor patterns 61, 62, 63. As a result, when the shaft 3 is pressed toward the switch mechanism 7, the slider 66 receives a force in a direction away from the resistor patterns 61, 62, 63 even if the rotor 65 is pulled downward. For this reason, the slider 66 is not pressed and deformed by the resistor patterns 61, 62, and 63, and the reliability of the output of the encoder mechanism 6 can be maintained.

  FIG. 6 is an exploded perspective view of the encoder mechanism 6 as viewed from below. As shown in FIG. 6, first, second, and third electrode portions 671, 672, and 673 are provided on the lower surface of the encoder substrate 60. The 1st electrode part 671, the 2nd electrode part 672, and the 3rd electrode part 673 are formed in an annular shape, and are arranged concentrically. The 1st electrode part 671, the 2nd electrode part 672, and the 3rd electrode part 673 are arranged in order from the outside in the diameter direction to the inside. The first electrode portion 671 is electrically connected to the end portion 601a of the first encoder terminal 601, the second electrode portion 672 is electrically connected to the end portion 602a of the second encoder terminal 602, and the third electrode portion. 673 is electrically connected to the end 603a of the third encoder terminal 603.

  An insulating sheet 68 is laminated on the first, second, and third electrode portions 671, 672, and 673. The insulating sheet 68 includes a first electrode portion 671 and a second electrode portion 672 so that the first electrode portion 671 is intermittently exposed in the circumferential direction and the second electrode portion 672 is intermittently exposed in the circumferential direction. Cover. That is, the insulating sheet 68 has a plurality of holes 68 a that are intermittently arranged in the circumferential direction, and the first electrode part 671 and the second electrode part 672 are exposed from the hole 68 a of the insulating sheet 68. The third electrode portion 673 is not covered with the insulating sheet 68.

  A first resistor pattern 61 is provided in a portion where the first electrode portion 671 is exposed from the insulating sheet 68; a second resistor pattern 62 is provided in a portion where the second electrode portion 672 is exposed from the insulating sheet 68; A third resistor pattern 63 is provided on the third electrode portion 673.

  Accordingly, the first resistor pattern 61 is electrically connected to the first encoder terminal 601 via the first electrode portion 671, and the second resistor pattern 62 is connected to the first electrode portion 672 via the second electrode portion 672. 2 is electrically connected to the encoder terminal 602, and the third resistor pattern 63 is electrically connected to the third encoder terminal 603 via the third electrode portion 673.

  FIG. 7 is a perspective view of the encoder mechanism 6 as viewed from below. As shown in FIG. 7, the first contact portion 661 of the slider 66 is at a position corresponding to the first resistor pattern 61, and the second contact portion 662 of the slider 66 is the second resistor pattern 62. The third contact portion 663 of the slider 66 is at a position corresponding to the third resistor pattern 63.

  Then, by the rotation of the slider 66, the first contact portions 661 are alternately brought into contact with the first resistor pattern 61 and the insulating sheet 68, and the second contact portion 662 is contacted with the second resistor pattern 62 and the insulating sheet. 68 and alternately contact. The third contact portion 663 is always in contact with the third resistor pattern 63. That is, by the rotation of the slider 66, the first encoder terminal 601 and the third encoder terminal 603 are intermittently electrically connected, and the second encoder terminal 602 and the third encoder terminal 603 are intermittently connected. Electrically connected.

  FIG. 8 is a circuit diagram showing an equivalent circuit of the encoder mechanism 6. FIG. 9 is a waveform diagram showing an output waveform of the encoder mechanism 6. As shown in FIGS. 8 and 9, when the first encoder terminal 601 and the third encoder terminal 603 are electrically connected, a current flows between the points A and C, and the A signal is turned on. Become. When the second encoder terminal 602 and the third encoder terminal 603 are electrically connected, a current flows between point B and point C, and the B signal is turned on.

  In the clockwise rotation of the slider 66, the rotation angle of the slider 66 from the start of turning off the A signal to the start of the next off is 60 °. The same applies to the B signal. Further, the difference between the start of turning off the A signal and the start of turning off the B signal is 15 ° in the rotation angle of the slider 66. Then, in one rotation of the slider 66 (that is, the rotation angle of the slider 66 is 360 °), the change in the combination of ON and OFF of the A signal and the B signal is divided into 24. That is, it can be determined that the rotation angle of the slider 66 changes every 15 ° in one rotation of the slider 66. Therefore, the rotation direction and rotation angle (rotation amount) of the slider 66 can be determined by determining changes in the A signal and the B signal.

  In the above-described embodiment, the example in which the resistor pattern is used for the fixed contact member has been described. However, the same effect can be obtained even when the fixed contact member itself also serves as a support. For example, a member in which a resin base material is impregnated with a conductive material, for example, a material in which a phenolic resin base material is impregnated with carbon black can be used instead of the encoder substrate used in the above embodiment. .

  In the above-described embodiment, the rotary encoder is used as an example of the rotary electronic component. However, a rotary electronic component such as a potentiometer or a trimmer capacitor may be used. At this time, instead of the encoder mechanism, a shaft rotation detection mechanism that detects the rotation direction and rotation angle of the shaft is used. The shaft rotation detection mechanism has the same configuration as the encoder mechanism, for example.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention defined in the appended claims. For example, a casing is not limited to what was described in said embodiment, A various well-known casing can be used.

1 Rotary encoder (rotary electronic components)
2 Casing 22 Side wall 22a Hole (switch fixing part)
22b Groove (encoder fixing part)
22c Locking part 23 Projection wall (encoder fixing part)
24 Projection piece (encoder fixing part)
DESCRIPTION OF SYMBOLS 3 Shaft 30 Gear-shaped outer peripheral surface 31 Convex part 32 Concave part 5 Restriction member 51 1st contact part 52 2nd contact part 6 Encoder mechanism (shaft rotation detection mechanism)
60 Encoder board 61, 62, 63 Resistor pattern 601, 602, 603 Encoder terminal 65 Rotor 651 Long diameter part 652 Short diameter part 66 Slider 7 Switch mechanism 70 Switch board 71 Conductor 701, 702, 703 Switch terminal

Claims (2)

A shaft,
A shaft rotation detection mechanism that holds the shaft in a state of insertion so as to be rotatable and vertically movable, and detects a rotation direction and a rotation angle of the shaft, and is attached to the shaft so as to be rotatable integrally with the shaft. The shaft rotation detection mechanism having a rotor, a slider attached to the rotor, and a fixed contact member with which the slider slidably contacts,
A regulating member provided on the opposite side of the fixed contact member across at least one isolation wall and regulating the rotation angle of the shaft;
A rotary electronic component having a switch mechanism pressed by an end of the shaft inserted through the shaft rotation detection mechanism ,
A rotary electronic component in which the shaft rotation detection mechanism has a substrate, the fixed contact member is a resistor pattern provided on the substrate, and the substrate also serves as one of the at least one isolation walls. A shaft,
An encoder mechanism for holding the shaft rotatably and vertically movable in an inserted state and detecting a rotation direction and a rotation angle of the shaft, the rotor being attached to the shaft so as to be rotatable integrally with the shaft And a slider attached to the rotor, and the encoder mechanism having a fixed contact member in sliding contact with the slider,
A regulating member provided on the opposite side of the fixed contact member across at least one isolation wall and regulating the rotation angle of the shaft;
A rotary encoder having a switch mechanism pressed by an end portion of the shaft inserted through the encoder mechanism,
A rotary encoder, wherein the encoder mechanism includes a substrate, the fixed contact member is a resistor pattern provided on the substrate, and the substrate also serves as one of the at least one isolation wall.

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