JP7587961B2 - Rotation Detection Device - Google Patents

Description

The present invention relates to a rotation detection device.

The rotation detection device described in Patent Document 1 below is configured to include a cylindrical rotary knob operation part (rotating body), a first gear part formed on the outer periphery of the rotary knob operation part, a second gear part meshed with the first gear part, and a rotation detection device part fixed to the second gear part so as to be integrally rotatable. As a result, when the rotary knob operation part rotates, the rotation detection device part rotates integrally with the second gear part. Therefore, the rotation of the rotary knob operation part can be detected by the rotation detection device part.

JP 2001-184966 A

However, the above rotation detection device has room for improvement in the following respects. That is, in the above rotation detection device, the second gear section and the rotation detection device section always rotate in conjunction with the rotation operation of the rotary knob operation section. For this reason, for example, wear of the second gear section and the rotation detection device section may reduce the durability of the rotation detection device. Therefore, it is desirable to configure the rotation detection device so that its durability can be improved.

In consideration of the above, the present invention aims to provide a rotation detection device that can improve durability.

One or more embodiments of the present invention are a rotation detection device comprising a rotating body configured to be rotatable around an axis, a plurality of detection units which detect the rotation of the rotating body by rotating , and an operating unit which is arranged to rotate integrally with the rotating body, extends circumferentially of the rotating body , and rotates the detection units arranged opposite to each other by the rotation of the rotating body , wherein the operating unit is not formed around the entire circumference of the rotating body, and at least one of the detection units and the operating unit are arranged opposite to each other at all rotational positions of the rotating body.

In one or more embodiments of the present invention, the actuating unit is a toothed portion formed on the inner or outer periphery of the rotating body, and the detecting unit is a rotation detecting device including a gear configured to be able to mesh with the toothed portion, and an encoder connected to the gear and operated by the rotation of the gear to detect the rotation of the gear.

One or more embodiments of the present invention are rotation detection devices in which the diameter of the gear is smaller than the diameter of the inner circumference of the rotating body.

One or more embodiments of the present invention are a rotation detection device comprising: a rotating body formed in a cylindrical shape and configured to be rotatable around an axis; a plurality of switches that detect rotation of the rotating body when activated; a switch activation portion that is rotatable together with the rotating body, extends in the circumferential direction of the rotating body, is arranged opposite the switches, and has a plurality of actuating protrusions that activate the switches by pressing the switches; and a switch non-operation portion that is rotatable together with the rotating body, extends in the circumferential direction of the rotating body, is arranged adjacent to one and the other sides of the switch actuation portion in the circumferential direction, and is configured not to contact the opposing switches, wherein the plurality of actuating protrusions are arranged at equal intervals around the rotating body, and at least one of the switches is arranged opposite the switch actuation portion at all rotational positions of the rotating body .

Durability can be improved by one or more embodiments of the present invention.

1 is a perspective view showing a rotation detection device according to a first embodiment; 2 is a perspective view showing the operation knob shown in FIG. 1 and a detection mechanism disposed within the operation knob; 3A is a perspective view showing a state in which the encoder shown in FIG. 2 is removed from a driven gear, and FIG. 3B is a perspective view of the operation knob shown in FIG. 3 is an explanatory diagram for explaining a positional relationship between the operation knob and a driven gear when the operation knob shown in FIG. 2 is rotated in one rotation direction. FIG. FIG. 11 is an exploded perspective view of a rotation detection device according to a second embodiment.

First Embodiment
Hereinafter, a rotation detection device 10 according to the first embodiment will be described with reference to FIGS. 1 to 4. The rotation detection device 10 is configured as an operating device that is installed, for example, on an instrument panel of a vehicle (automobile) and operated by a passenger. As shown in FIGS. 1 and 2, the rotation detection device 10 includes a housing 12 that constitutes the outer shell of the rotation detection device 10, an operation knob 20 as a substantially cylindrical "rotating body" rotatably connected to the housing 12, and a detection mechanism 30 provided inside the operation knob 20. In the following description, one axial side of the operation knob 20 (the side indicated by the arrow A in FIGS. 1 and 2) is the upper side of the rotation detection device 10, and the other axial side of the operation knob 20 (the side indicated by the arrow B in FIGS. 1 and 2) is the lower side of the rotation detection device 10. Hereinafter, the operation knob 20 and the detection mechanism 30 in the rotation detection device 10 will be mainly described.

(Regarding the operation knob 20)
1 to 3, the operation knob 20 is formed in a generally cylindrical shape with its axial direction extending in the up-down direction. The operation knob 20 is disposed on the upper side of the housing 12, and is connected to the housing 12 by a shaft portion (not shown) provided inside the housing 12 so as to be rotatable about its own axis. The operation knob 20 is configured as a knob that is rotated by an operator, and is exposed inside the cabin of the vehicle.

The operation knob 20 has a groove 21 that is open to the top, and the groove 21 is formed around the entire circumference of the operation knob 20. In other words, the operation knob 20 is formed in a ring shape that is open to the top and has a generally U-shaped cross section.

Rack teeth 22 are formed on the upper part of the inner circumference of the operation knob 20 as the "operating portion" and "tooth portion" that constitute the detection mechanism 30 described later. The rack teeth 22 extend in the circumferential direction of the operation knob 20 and are formed intermittently in the circumferential direction of the operation knob 20. In other words, the rack teeth 22 are configured as a so-called intermittent gear that extends in the circumferential direction of the operation knob 20. Specifically, the rack teeth 22 include first rack teeth 22A and second rack teeth 22B, and the first rack teeth 22A and the second rack teeth 22B are configured by a plurality of teeth aligned in the circumferential direction of the operation knob 20.

In addition, the portion of the inner circumference of the operation knob 20 on one side of the rotation direction of the operation knob 20 with respect to the first rack teeth 22A (the side of the arrow C in FIG. 2) is configured as a first tooth-missing portion 23 (an element that can be broadly understood as a "non-operating portion"), and the first tooth-missing portion 23 extends between the first rack teeth 22A and the second rack teeth 22B. On the other hand, the portion of the inner circumference of the operation knob 20 on the other side of the rotation direction of the operation knob 20 with respect to the first rack teeth 22A (the side of the arrow D in FIG. 2) is configured as a second tooth-missing portion 24 (an element that can be broadly understood as a "non-operating portion"), and the second tooth-missing portion 24 extends between the first rack teeth 22A and the second rack teeth 22B. As a result, the first rack teeth 22A, the first tooth-missing portion 23, the second rack teeth 22B, and the second tooth-missing portion 24 are arranged in this order on the inner circumference of the operation knob 20 on one side in the rotation direction of the operation knob 20.

The extension length of the first rack teeth 22A, the first tooth-missing portion 23, and the second rack teeth 24 is set to 1/5 of the total circumference of the operation knob 20, and the extension length of the second rack teeth 22B is set to 2/5 of the total circumference of the operation knob 20. In other words, the range of the first rack teeth 22A, the first tooth-missing portion 23, and the second tooth-missing portion 24 in the circumferential direction of the operation knob 20 corresponds to a rotation angle of 72 degrees of the operation knob 20, and the range of the second rack teeth 22B in the circumferential direction of the operation knob 20 corresponds to a rotation angle of 144 degrees of the operation knob 20.

A knob panel 14 (see FIG. 1) is provided above the operation knob 20. The knob panel 14 is formed in a generally circular plate shape with the thickness direction extending vertically, and the opening of the operation knob 20 is closed from above by the knob panel 14.

(Regarding the detection mechanism 30)
As shown in FIG. 2 and FIG. 3, the detection mechanism 30 is configured to include rack teeth 22 (first rack teeth 22A and second rack teeth 22B) formed on the above-mentioned operating knob 20, driven gears 32A, 32B serving as a pair of "detection units" and "gears," and encoders 40A, 40B serving as a pair of "detection units."

The driven gears 32A and 32B are formed in a substantially circular plate shape with the thickness direction being the vertical direction. The diameter of the driven gears 32A and 32B is set smaller than the diameter of the inner circumference of the operation knob 20, and the driven gears 32A and 32B are arranged radially inside the operation knob 20. In detail, the driven gears 32A and 32B are arranged radially inside the inner circumference of the operation knob 20 on which the first rack teeth 22A and the second rack teeth 22B are formed, and are configured to be arranged opposite the first rack teeth 22A and the second rack teeth 22B in the radial direction of the operation knob 20. A support shaft (not shown) protruding downward is formed in the center of the driven gears 32A and 32B, and the support shaft is rotatably supported by a shaft portion connected to the operation knob 20.

A gear portion 33 is formed on the outer periphery of the driven gears 32A and 32B. The gear portion 33 is composed of a plurality of teeth, and the teeth are formed over the entire circumference of the driven gears 32A and 32B. The gear portion 33 is configured to mesh with the first rack teeth 22A or the second rack teeth 22B arranged opposite the driven gears 32A and 32B. As a result, when the operation knob 20 rotates with the gear portion 33 meshing with the first rack teeth 22A or the second rack teeth 22B, the driven gears 32A and 32B rotate around their own axis. On the other hand, when the driven gears 32A and 32B are arranged opposite the first tooth-missing portion 23 or the second tooth-missing portion 24 of the operation knob 20, the driven gears 32A and 32B and the operation knob 20 are not in contact with each other. As a result, even if the operating knob 20 is rotated in this state, the driven gears 32A and 32B will not operate.

The driven gears 32A and 32B are arranged side by side in the rotational direction of the operation knob 20, and the driven gear 32A is arranged spaced apart from the driven gear 32B on one side of the rotational direction of the operation knob 20. The distance between the driven gears 32A and 32B in the rotational direction of the operation knob 20 is set so that at least one of the driven gears 32A and 32B is arranged opposite the first rack teeth 22A or the second rack teeth 22B and meshes with the first rack teeth 22A or the second rack teeth 22B in all rotational positions of the operation knob 20. In other words, the distance between the driven gears 32A and 32B in the rotational direction of the operation knob 20 is set to be greater than or equal to the extension length of the first tooth-missing portion 23 and the second tooth-missing portion 24. In other words, the driven gears 32A and 32B are not positioned opposite the first tooth-missing portion 23 or the second tooth-missing portion 24 at the same time in all rotation positions of the operation knob 20.

In addition, a connecting shaft 34 is provided at the center of the driven gears 32A and 32B to connect the driven gears 32A and 32B to the encoders 40A and 40B described below. The connecting shaft 34 is formed in a columnar shape that protrudes upward, and is formed in a roughly H-shape when viewed from above.

As shown in FIG. 2, the encoders 40A and 40B are disposed adjacent to the upper side of the driven gears 32A and 32B, respectively, and are mounted on a control board (not shown). The encoders 40A and 40B are configured as rotary encoder switches that are connected to the driven gears 32A and 32B to detect the rotational positions of the driven gears 32A and 32B. The encoders 40A and 40B have connecting holes 41, and the connecting shafts 34 of the driven gears 32A and 32B are inserted into the connecting holes 41 disposed on the upper side and connected to the encoders 40A and 40B. The encoders 40A and 40B are configured to operate and detect the rotation of the driven gears 32A and 32B as the driven gears 32A and 32B rotate. The encoders 40A and 40B are also configured to be electrically connected to the control unit 50 and to output detection signals to the control unit 50. At least one of the driven gears 32A and 32B is engaged with the first rack teeth 22A or the second rack teeth 22B at all rotation positions of the operation knob 20, so the control unit 50 detects the rotation position of the operation knob 20 based on the detection signals from the encoders 40A and 40B.

(Action and Effect)
Next, the effect of the present embodiment will be described with reference to Fig. 4. Fig. 4 shows a time series of states in which the operation knob 20 is rotated in one direction in a rotational direction by 72 degrees each time. The position of the operation knob 20 in Fig. 4(a) is the initial position, the position of the operation knob 20 in Fig. 4(b) is the first position, the position of the operation knob 20 in Fig. 4(c) is the second position, the position of the operation knob 20 in Fig. 4(d) is the third position, and the position of the operation knob 20 in Fig. 4(e) is the fourth position.

As shown in FIG. 4(a), in the initial position of the operating knob 20, the gear portion 33 of the driven gear 32A meshes with the longitudinal middle portion of the first rack teeth 22A, and the driven gear 32B is disposed opposite the longitudinal middle portion of the second toothless portion 24.

When the operation knob 20 rotates from the initial position to one side in the rotation direction (the direction of the arrow C in FIG. 4), the meshing state between the gear portion 33 of the driven gear 32A and the first rack teeth 22A is released between the initial position and the first position. Then, in the first position, the driven gear 32A is disposed opposite the longitudinal middle portion of the second tooth-missing portion 24, and the driven gear 32A and the operation knob 20 are in a non-mesh state. Also, when the operation knob 20 rotates from the initial position to the first position, the gear portion 33 of the driven gear 32B meshes with the second rack teeth 22B before the meshing state between the gear portion 33 of the driven gear 32A and the first rack teeth 22A is released. Then, in the first position, the gear portion 33 of the driven gear 32B meshes with the longitudinal one side portion of the second rack teeth 22B (see FIG. 4B). Therefore, when the operating knob 20 is rotated from the initial position to the first position, the encoder 40A is switched from an active state to a stopped state. On the other hand, the encoder 40B is switched from a stopped state to an active state before the encoder 40A is switched to the stopped state.

When the operation knob 20 rotates from the first position to one side in the rotation direction, the gear portion 33 of the driven gear 32A meshes with the second rack teeth 22B between the first position and the second position, and the gear portion 33 of the driven gear 32A meshes with the longitudinal one side portion of the second rack teeth 22B at the second position. When the operation knob 20 rotates from the first position to the second position, the meshing state between the gear portion 33 of the driven gear 32B and the second rack teeth 22B is maintained, and at the second position, the gear portion 33 of the driven gear 32B meshes with the longitudinal other side portion of the second rack teeth 22B (see (c) of FIG. 4). Therefore, when the operation knob 20 rotates from the first position to the second position, the encoder 40A switches from a stopped state to an operating state, and the operating state of the encoder 40B continues.

When the operation knob 20 rotates from the second position to one side in the rotation direction, the meshing state between the gear portion 33 of the driven gear 32B and the second rack teeth 22B is released between the second position and the third position. Then, in the third position, the driven gear 32B is arranged opposite to the longitudinal middle portion of the first tooth-missing portion 23, and the driven gear 32B and the operation knob 20 are in a non-mesh state. In addition, when the operation knob 20 rotates from the second position to the third position, the meshing state between the gear portion 33 of the driven gear 32A and the second rack teeth 22B is maintained, and in the third position, the gear portion 33 of the driven gear 32A meshes with the other longitudinal side portion of the second rack teeth 22B (see (d) in FIG. 4). Therefore, when the operation knob 20 rotates from the second position to the third position, the encoder 40B switches from an operating state to a stopped state. Meanwhile, the encoder 40A continues to operate.

When the operation knob 20 rotates from the third position to one side in the rotation direction, the meshing state between the gear portion 33 of the driven gear 32A and the second rack teeth 22B is released between the third position and the fourth position. Then, in the fourth position, the driven gear 32A is disposed opposite the longitudinal middle portion of the first tooth-missing portion 23, and the driven gear 32A and the operation knob 20 are in a non-meshing state. Also, when the operation knob 20 rotates from the third position to the fourth position, before the meshing state between the gear portion 33 of the driven gear 32A and the second rack teeth 22B is released, the gear portion 33 of the driven gear 32B meshes with the first rack teeth 22A, and in the fourth position, the gear portion 33 of the driven gear 32B meshes with the longitudinal middle portion of the first rack teeth 22A (see FIG. 4(e)). Therefore, when the operating knob 20 is rotated from the third position to the fourth position, the encoder 40A is switched from an operating state to a stopped state. Meanwhile, the encoder 40B is switched from a stopped state to an operating state before the encoder 40A is switched to the stopped state.

When the operation knob 20 rotates from the fourth position to one side in the rotation direction, the meshing state between the gear portion 33 of the driven gear 32B and the first rack teeth 22A is released between the fourth position and the initial position. Then, in the initial position, the driven gear 32B is disposed opposite the longitudinal middle portion of the second tooth-missing portion 24, and the driven gear 32B and the operation knob 20 are in a non-meshing state. Also, when the operation knob 20 rotates from the fourth position to the initial position, the gear portion 33 of the driven gear 32A meshes with the first rack teeth 22A before the meshing state between the gear portion 33 of the driven gear 32B and the first rack teeth 22A is released, and at the initial position, the gear portion 33 of the driven gear 32A meshes with the longitudinal middle portion of the first rack teeth 22A (see FIG. 4A). Therefore, when the operating knob 20 is rotated from the fourth position to the initial position, the encoder 40B is switched from an operating state to a stopped state. On the other hand, the encoder 40A is switched from a stopped state to an operating state before the encoder 40B is switched to the stopped state.

In this way, when the control knob 20 is rotated, at least one of the encoders 40A and 40B is in an activated state at all rotation positions of the control knob 20. This allows the control unit 50 to detect the rotation position of the control knob 20 based on the detection signals output from the encoders 40A and 40B.

As described above, in the rotation detection device 10 of the first embodiment, the rack teeth 22 are formed on the inner circumference of the operation knob 20. The rack teeth 22 include first rack teeth 22A and second rack teeth 22B, and the first rack teeth 22A and the second rack teeth 22B extend in the circumferential direction of the operation knob 20. In addition, the driven gears 32A, 32B of the detection mechanism 30 are disposed radially inside the inner circumference of the operation knob 20 and are configured to be able to mesh with the first rack teeth 22A and the second rack teeth 22B. In the radial direction of the operation knob 20, the driven gears 32A, 32B are arranged opposite the first rack teeth 22A or the second rack teeth 22B, and when the operation knob 20 rotates with the driven gears 32A, 32B meshing with the first rack teeth 22A or the second rack teeth 22B, the encoders 40A, 40B of the detection mechanism 30 are activated to detect the rotation of the driven gears 32A, 32B.

Here, the rack teeth 22 are not formed around the entire circumference of the operation knob 20. Specifically, the rack teeth 22 are formed intermittently in the circumferential direction of the operation knob 20, and the first and second rack teeth 22A and 22B that constitute the rack teeth 22 are formed with the first and second tooth-missing portions 23 and 24. Therefore, when the operation knob 20 rotates once, the driven gears 32A and 32B do not rotate continuously but intermittently. In other words, when the driven gears 32A and 32B are arranged opposite the first tooth-missing portion 23 or the second tooth-missing portion 24, the driven gears 32A and 32B are not engaged with the operation knob 20, and the driven gears 32A and 32B do not rotate in conjunction with the rotation of the operation knob 20. This reduces wear and tear on the driven gears 32A and 32B compared to a configuration in which the driven gears 32A and 32B are always linked to the rotation of the operation knob 20. Also, compared to the above configuration, the operating time of the encoders 40A and 40B can be shortened. Therefore, the durability of the driven gears 32A and 32B and the encoders 40A and 40B can be improved.

Furthermore, at least one of the driven gears 32A, 32B is disposed opposite the first rack teeth 22A or the second rack teeth 22B of the operation knob 20 at all rotation positions of the operation knob 20. That is, at least one of the driven gears 32A, 32B is engaged with the first rack teeth 22A or the second rack teeth 22B. As a result, even if the rack teeth 22 are not formed around the entire circumference of the inner periphery of the operation knob 20, at least one of the driven gears 32A, 32B rotates in conjunction with the rotation of the operation knob 20, so that the rotation of the operation knob 20 can be detected by detecting the rotating driven gears 32A, 32B with the encoders 40A, 40B. As a result, the durability of the rotation detection device 10 can be improved.

In addition, the rack teeth 22 are formed on the inner circumference of the operation knob 20, and the driven gears 32A, 32B and the encoders 40A, 40B are arranged radially inside the operation knob 20. This allows the rotation of the operation knob 20 to be detected by the detection mechanism 30 while ensuring the operability of the operation knob 20.

The diameter of the driven gears 32A, 32B is set smaller than the diameter of the inner circumference of the operation knob 20. This allows the driven gears 32A, 32B to increase in speed when the operation knob 20 is rotated. In other words, the rotation speed of the driven gears 32A, 32B when the operation knob 20 is rotated can be made greater than the rotation speed of the operation knob 20. Therefore, the encoders 40A, 40B can accurately detect the rotational positions of the driven gears 32A, 32B, and therefore the rotational position of the operation knob 20.

Second Embodiment
The rotation detector 100 according to the second embodiment will be described below with reference to Fig. 5. The rotation detector 100 is generally formed in a cylindrical shape. In the following description, one axial side of the rotation detector 100 (the side indicated by the arrow A in Fig. 5) is referred to as the upper side, and the other axial side of the rotation detector 100 (the side indicated by the arrow B in Fig. 5) is referred to as the lower side.

The rotation detector 100 includes a substantially cylindrical base 102 with the vertical axis as the axial direction, a substantially cylindrical push knob 104 with a bottom that opens downward, and a rotor 110 as a "rotating body." The push knob 104 is inserted inside the base 102 and is connected to the base 102 so that it can be pressed downward.

The rotor 110 is formed in a generally cylindrical shape with its axial direction extending vertically, and is rotatably connected to the base 102 on the radially outer side of the push knob 104. A dial knob 106 is provided on the radially outer side of the rotor 110, and is connected to the rotor 110 so as to be rotatable together with it. The dial knob 106 is configured as a knob that is operated by an operator.

A switch actuation portion 112 is formed on the lower end surface of the rotor 110 as an "actuation portion." The switch actuation portion 112 extends in the circumferential direction of the rotor 110, but is not formed over the entire circumference of the rotor 110 (see the range indicated by the arrow E in FIG. 5). Specifically, the extension length of the switch actuation portion 112 in the circumferential direction of the rotor 110 is set to approximately 1/2 of the entire circumference of the rotor 110. The portion of the lower end surface of the rotor 110 where the switch actuation portion 112 is not formed is configured as a switch non-actuation portion 114. As a result, the lower end surface of the rotor 110 is configured by the switch actuation portion 112 and the switch non-actuation portion 114.

The switch actuation portion 112 has multiple actuation protrusions 112A that protrude downward, and the multiple actuation protrusions 112A are arranged at equal intervals around the circumference of the rotor 110.

A control board 120 is provided below the rotor 110, and a pair of detection switches 122A, 122B serving as a "detector" and "switch" are mounted on the upper surface of the control board 120. The detection switches 122A, 122B are arranged facing the lower end surface of the rotor 110 in the up-down direction. The detection switches 122A, 122B are also arranged 180 degrees apart in the circumferential direction of the rotor 110.

The detection switches 122A and 122B are configured to include a switch body 123 and a switch section 124. The switch section 124 is connected to the switch body 123 so as to be tiltable. The detection switches 122A and 122B are electrically connected to the control section 130, and are configured to output an ON signal to the control section 130 when the switch section 124 is pressed. When the detection switches 122A and 122B are arranged opposite the switch operating section 112 and the rotor 110 rotates, the switch section 124 is pressed by the operating protrusion 112A. On the other hand, when the detection switches 122A and 122B are arranged opposite the switch non-operating section 114, the switch section 124 and the switch non-operating section 114 are not in contact with each other, and the detection switches 122A and 122B are configured to be in a non-operating state.

Furthermore, the extension length of the switch actuation portion 112 is set so that at least one of the detection switches 122A, 122B is arranged opposite the switch actuation portion 112 of the rotor 110 in all rotational positions of the rotor 110. In other words, the detection switches 122A, 122B are set so that they are not arranged opposite the switch non-actuation portion 114 of the rotor 110 at the same time in all rotational positions of the rotor 110. As a result, when the rotor 110 rotates, at least one of the detection switches 122A, 122B outputs an on/off signal to the control portion 130, so that the control portion 130 can detect the rotational position of the rotor 110.

Also, in the second embodiment of the rotation detection device 100, the switch operating portion 112 of the rotor 110 is not formed around the entire circumference of the rotor 110. Therefore, when the rotor 110 rotates once, there is a section in which one of the detection switches 122A and 122B is in an inactive state. In other words, both the detection switches 122A and 122B are not continuously activated. As a result, the durability of the rotation detection device 100 can be improved in the second embodiment as well.

In the first embodiment of the rotation detector 10, the rack teeth 22 are formed on the inner circumference of the operation knob 20, and the driven gears 32A, 32B and the encoders 40A, 40B are arranged radially inside the operation knob 20. Alternatively, the rack teeth 22 may be formed on the outer circumference of the operation knob 20, and the driven gears 32A, 32B and the encoders 40A, 40B may be arranged radially outside the operation knob 20. In this case, for example, the rack teeth 22 and the detection mechanism 30 may be covered by the housing 12 to make the rack teeth 22 and the detection mechanism 30 invisible from the outside. In this case, since the detection mechanism 30 is arranged radially outside the operation knob 20, other mechanisms such as a lighting mechanism can be arranged radially inside the operation knob 20.

In addition, in the rotation detection device 10 of the first embodiment, the rack teeth 22 are configured with two rack teeth, the first rack teeth 22A and the second rack teeth, but the rack teeth 22 may be configured with rack teeth in one location, or with rack teeth in three or more locations.

In addition, in the second embodiment of the rotation detection device 100, one switch actuation portion 112 is formed on the lower end surface of the rotor 110, but two or more switch actuation portions may be formed on the lower end surface of the rotor 110.

In the first embodiment, the rotation detection device 10 has a pair of driven gears 32A, 32B and encoders 40A, 40B, and in the second embodiment, the rotation detection device 100 has a pair of detection switches 122A, 122B. Alternatively, three or more driven gears and encoders may be provided in the rotation detection device 10 of the first embodiment, and three or more detection switches may be provided in the rotation detection device 100 of the second embodiment.

10 Rotation detection device 20 Operation knob (rotating body)
22 Rack teeth (operating part) (tooth part)
32A Driven gear (detection part) (gear)
32B Driven gear (detection part) (gear)
40A Encoder (detection part)
40B Encoder (detection unit)
100 Rotation detection device 110 Rotor (rotating body)
112 Switch actuation part (actuation part)
122A Detection switch (detection part) (switch)
122B Detection switch (detection part) (switch)

Claims (4)

A rotating body formed in a cylindrical shape and configured to be rotatable around an axis;
A plurality of detection units that detect rotation of the rotating body by rotating ;
an actuation section that is provided on the rotating body so as to be rotatable integrally with the rotating body, extends in a circumferential direction of the rotating body , and rotates the detection section that is disposed opposite the rotating body when the rotating body rotates ;
Equipped with
A rotation detection device in which the operating portion is not formed around the entire circumference of the rotating body, and at least one of the detection portions and the operating portion is arranged opposite each other at all rotational positions of the rotating body. the operating portion is a tooth portion formed on an inner circumferential portion or an outer circumferential portion of the rotating body,
The detection unit is
A gear configured to be meshed with the tooth portion;
an encoder coupled to the gear and actuated by rotation of the gear to detect rotation of the gear;
The rotation detection device according to claim 1 , further comprising: The rotation detection device according to claim 2, wherein the diameter of the gear is smaller than the diameter of the inner circumference of the rotating body. A rotating body formed in a cylindrical shape and configured to be rotatable around an axis;
a plurality of switches that are actuated to detect rotation of the rotor;
a switch actuation portion that is provided on the rotating body so as to be rotatable integrally with the rotating body, extends in a circumferential direction of the rotating body, and has a plurality of actuation protrusions that are disposed opposite the switch and press the switch to actuate the switch;
a switch non-operation portion that is provided on the rotating body so as to be rotatable integrally with the rotating body, extends in a circumferential direction of the rotating body, and is disposed adjacent to one side and the other side of the switch operation portion in the circumferential direction, and is configured not to be in contact with the switch that faces the switch non-operation portion;
Equipped with
A rotation detection device in which the multiple actuating protrusions are arranged at equal intervals around the circumference of a rotating body, and at least one of the switches is arranged opposite the switch actuating portion at all rotational positions of the rotating body.

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