JP2021089842A - Rotation detection device - Google Patents

Abstract

To provide a rotation detection device capable of detecting a failure at the time of non-rotation operation.SOLUTION: A rotation detection device 1 includes a rotation operation unit 2 that accepts rotation operations, a light emitting unit 3 that outputs light, a light receiving unit 4 that is arranged so as to face the light emitting unit 3 and receives light, a transmission unit 26 that is provided in the rotation operation unit 2 so as to move between the light emitting unit 3 and the light receiving unit 4 in accordance with the rotation operation and transmits light, a switching unit 28 that is provided in the rotation operation unit 2 adjacent to the transmission unit 26, faces the light emitting unit 3 and the light receiving unit 4 during the non-rotation operation of the rotation operation unit 2, transmits light during the non-rotation operation, and blocks light during the rotation operation to switch the light transmittance, and a control unit 10 that controls the light transmittance of the switching unit 28, and determines that a failures occurs in at least one of the light emitting unit 3, the light receiving unit 4, and the switching unit 28 when the light receiving unit 4 does not receive the light of the light emitting unit 3 during the non-rotation operation.SELECTED DRAWING: Figure 5

Description

The present invention relates to a rotation detection device.

As a conventional technique, an operation unit that is rotated by an operator, a rotating body that rotates together with the operating unit, and a slit portion that allows light to pass through and blocks light are provided alternately and continuously in the circumferential direction of the rotating body. A rotation detection device including a light-shielding unit, a photo interrupter, and a detection unit is known (see, for example, Patent Document 1).

The photo interrupter has a light emitting unit that generates light and two light receiving units that receive light from the light emitting unit and generate a light receiving signal, and a slit portion and a light shielding portion are arranged between the light emitting unit and the two light receiving units. The two light receiving portions are arranged so as to line up in the circumferential direction of the rotating body. The detection unit detects the rotation direction and the amount of rotation of the operation unit based on the combination pattern of the light-receiving signals of the two light-receiving units that change according to the positions of the slit portion and the light-shielding portion.

JP-A-2017-53720

The conventional rotation detection device cannot detect at least one failure of the light emitting unit and the two light receiving units, particularly when the operation unit is not rotated, that is, when it is not rotated.

Therefore, an object of the present invention is to provide a rotation detection device capable of detecting a failure during a non-rotation operation.

One aspect of the present invention includes a rotation operation unit that accepts a rotation operation, a light emitting unit that outputs light, a light receiving unit that is arranged so as to face the light emitting unit and receives light, and a light emitting unit that accompanies the rotation operation. It is provided in the rotation operation unit so as to move between the light receiving units, and is provided in the rotation operation unit adjacent to the transmission unit and the transmission unit that transmits light, and the light emitting unit and the light receiving unit are provided when the rotation operation unit is not rotated. A switching unit that faces the unit and transmits light during non-rotation operation and switches the light transmittance so as to block light during rotation operation, and controls the light transmittance of the switching unit to receive light during non-rotation operation. Provided is a rotation detection device including a control unit that determines that a failure has occurred in at least one of the light emitting unit, the light receiving unit, and the switching unit when the unit does not receive the light of the light emitting unit.

According to the present invention, failure detection can be performed during a non-rotating operation.

FIG. 1A is a schematic view showing an example of a control device including the rotation detection device according to the embodiment, and FIG. 1B is an example of a block diagram of the rotation detection device. FIG. 2A is a side view showing an example of a rotation operation unit of the rotation detection device according to the embodiment, and FIG. 2B is a perspective view showing an example of the rotation operation unit. FIG. 3A shows an example of a switching unit in a state where the light transmittance is low in the rotation detection device according to the embodiment, and FIG. 3B shows an example of a switching unit in a state where the light transmittance is high. 3 (c) shows an example of the photosensor unit. FIG. 4A is a schematic view for explaining an example of the positional relationship between the rotation operation unit and the photosensor unit of the rotation detection device according to the embodiment, and FIG. 4B is a first light receiving unit. It is the schematic which shows an example of the light-receiving signal output by the 2nd light-receiving part. FIG. 5 is a flowchart showing an example of the operation of the rotation detection device according to the embodiment.

(Summary of Embodiment)
The rotation detection device according to the embodiment includes a rotation operation unit that receives a rotation operation, a light emitting unit that outputs light, a light receiving unit that is arranged so as to face the light emitting unit and receives light, and a light receiving unit that receives light. It is provided in the rotation operation unit so as to move between the light emitting unit and the light receiving unit, and is provided in the rotation operation unit adjacent to the transmission unit and the transmission unit that transmits light, and emits light when the rotation operation unit is not rotated. A switching unit that faces the unit and the light receiving unit, transmits light during non-rotation operation, and switches the light transmittance so as to block light during rotation operation, and controls the light transmittance of the switching unit to perform non-rotation operation. A control unit for determining that a failure has occurred in at least one of the light emitting unit, the light receiving unit, and the switching unit when the light receiving unit does not receive the light of the light emitting unit at the time is roughly configured.

In this rotation detection device, the transmittance of light is switched so that light is transmitted when the switching unit is not rotated. Therefore, compared to the case where this configuration is not adopted, the light receiving unit emits light from the light emitting unit when the switching unit is not rotated. When no light is received, it can be determined that a failure has occurred in at least one of the light emitting unit, the light receiving unit, and the switching unit.

[Embodiment]
(Overview of rotation detection device 1)
FIG. 1A is a schematic view showing an example of a control device provided with a rotation detection device, and FIG. 1B is an example of a block diagram of the rotation detection device. FIG. 2A is a side view showing an example of the rotation operation unit of the rotation detection device, and FIG. 2B is a perspective view showing an example of the rotation operation unit. In each figure according to the embodiment described below, the ratio between the figures may differ from the actual ratio. Further, in FIG. 1B, the main signal and information flow are indicated by arrows. Further, "A to B" indicating a numerical range shall be used in the meaning of A or more and B or less.

FIG. 1A shows a control device 8 for controlling an air conditioner 7 for a vehicle. The control device 8 is arranged on a center console or the like between the driver's seat and the passenger seat. The air conditioner 7 performs air conditioning (heating, cooling, dehumidification, and ventilation) in the vehicle, and mainly switches the outlet, adjusts the temperature of the air to be sent out, adjusts the air volume, and the like. The control device 8 can instruct the air conditioner 7 to switch the outlet, set the air temperature, set the air volume, and the like based on the user's operation.

The user can set the temperature of the air to be sent and set the air volume by operating the plurality of rotation detection devices 1 and the plurality of switches 82 of the operation panel 80 of the control device 8 individually or in combination. , You can instruct the selection of the outlet. In the control device 8, two rotation detection devices 1 are arranged so as to sandwich the display 84. The rotation detection device 1 enables various settings on the driver's seat side and the passenger's seat side.

As shown in FIGS. 1A to 2B, the rotation detection device 1 is arranged so as to face the rotation operation unit 2 that accepts the rotation operation, the light emitting unit 3 that outputs light, and the light emitting unit 3. A light receiving unit 4 that receives light, and a transmitting unit 26 and a transmitting unit 26 that are provided in the rotating operation unit 2 so as to move between the light emitting unit 3 and the light receiving unit 4 in accordance with the rotation operation and transmit light. It is provided in the rotation operation unit 2 adjacent to the rotation operation unit 2 so as to face the light emitting unit 3 and the light receiving unit 4 when the rotation operation unit 2 is not rotating, to transmit light during the non-rotation operation, and to block the light during the rotation operation. When the light transmitting unit 28 controls the light transmittance of the switching unit 28 and the switching unit 28, and the light receiving unit 4 does not receive the light of the light emitting unit 3 during the non-rotation operation, the light emitting unit 3 and the light receiving unit 4 , And a control unit 10 for determining that a failure has occurred in at least one of the switching units 28.

As shown in FIG. 2A, the light emitting unit 3 and the light receiving unit 4 constitute a photosensor unit 5. The photosensor unit 5 is arranged on the substrate 83 exposed to the through hole 81 of the operation panel 80.

(Structure of rotation operation unit 2)
The rotation operation unit 2 is a rotating body that accepts a rotation operation. The rotation operation unit 2 is formed by using a resin material. As shown in FIGS. 2 (a) and 2 (b), the rotation operation unit 2 is roughly configured with a knob portion 20 and a base portion 22. The rotation operation unit 2 is arranged in a through hole 81 provided in the operation panel 80.

As shown in FIG. 2A, for example, the rotation operation unit 2 is attached to a support shaft 830 provided on the substrate 83 and rotates in the forward direction and the reverse direction. The positive direction is the clockwise direction of the paper in FIG. 1A, that is, the direction of arrow A. The reverse direction is the counterclockwise direction of the paper surface of FIG. 1A, that is, the direction of arrow B.

As shown in FIG. 2A, the knob portion 20 has a conical shape such that the tip thereof is cut in a direction intersecting the rotation shaft 200, and protrudes from the surface 800 of the operation panel 80. The user grips the knob portion 20 and rotates the rotation operation portion 2.

The base portion 22 is provided at the lower portion of the knob portion 20 and has a larger radius than the lower portion. The base portion 22 is provided with a transmission portion 26 and a switching portion 28.

The transmission unit 26 and the switching unit 28 are continuously and alternately provided along the outer circumference of the rotation operation unit 2. The transmission portion 26 is a slit provided in the base portion 22, in other words, a notch portion having a rectangular shape. Since there is no object that blocks the light in the transmitting portion 26, the light is transmitted. As a modification, the transmitting portion 26 may be formed of a transparent resin such as polycarbonate, which transmits light.

The switching portion 28 is arranged on the fin 27 which is a portion remaining after cutting out the base portion 22. The fin 27 has a rectangular shape. The fin 27 is provided between the transmission portion 26 and the transmission portion 26, and the switching portion 28 is attached to the fin 27. Six transmission portions 26 and six fins 27 are provided on the base portion 22 at intervals of 30 ° around the rotation shaft 200, but the present invention is not limited thereto.

As a modification, the rotation detection device 1 is not limited to the one in which the switching portion 28 is provided on the fin 27, and the switching portion 28 itself is arranged on the base portion 22 at equal intervals, and the switching portion 28 is placed between the switching portion 28 and the switching portion 28. The transmission portion 26 may be used. In this case, six transmission portions 26 and six switching portions 28 are provided on the base portion 22 at intervals of 30 ° around the rotation shaft 200. The number of the transmission unit 26 and the switching unit 28 is changed according to the specifications required for the rotation detection device 1.

In the switching unit 28, no voltage is applied during the rotation operation and the light transmittance is lowered to block the light, and during the non-rotation operation, the voltage is applied and the light transmittance is increased to transmit the light. It is a transparent display. The transparent display is, for example, a negative type organic EL (Electro-Luminescence) display or a liquid crystal display.

FIG. 3A shows an example of a switching unit in a state where no voltage is applied and the light transmittance is low, and FIG. 3B shows a switching unit in a state where a voltage is applied and the light transmittance is high. An example is shown, and FIG. 3C shows an example of the photosensor unit. FIG. 4A is a schematic view for explaining an example of the positional relationship between the rotation operation unit and the photosensor unit, and FIG. 4B is output by the first light receiving unit and the second light receiving unit. It is the schematic which shows an example of the received light signal. FIG. 4B shows a light receiving signal S ₂ and a light receiving signal S ₃ in the range of −180 ° to + 180 °.

A plurality of movable electrodes 24 having a hemispherical shape protruding from the side surface 220 are arranged on the base portion 22. The movable electrode 24 is formed of a conductive metal member or resin member. The movable electrode 24 is arranged above the switching portion 28 as shown in FIGS. 3 (a) and 3 (b).

The switching unit 28 faces the light emitting unit 3 and the light receiving unit 4 at the time of non-rotation operation by the moderation mechanism 6 of the rotation operation unit 2. Specifically, as shown in FIG. 4A, the moderation mechanism 6 is composed of a fixed electrode 60 and a movable electrode 24. The fixed electrode 60 is attached to the inner surface 810 of the through hole 81 of the operation panel 80. Since a voltage V is supplied to the fixed electrode 60 when a failure is detected, it is electrically connected to the control unit 10. The fixed electrode 60 is formed in a plate shape using a conductive metal material or resin material, and further has elasticity. The fixed electrode 60 has a recess in the center so that the movable electrode 24 can be fitted. When the rotation operation unit 2 rotates, the movable electrode 24 fits into the fixed electrode 60 to generate moderation. This moderation is generated at 60 ° intervals.

The movable electrode 24 is electrically connected to the switching portion 28. The switching unit 28 is supplied with a voltage V via the moderation mechanism 6, that is, via the fixed electrode 60 and the movable electrode 24. By applying this voltage V, the switching unit 28 switches from the state of blocking the light of FIG. 3 (a) to the state of transmitting the light shown in FIG. 3 (b). It is assumed that the switching unit 28 is further electrically connected to the support shaft 830 that rotatably supports the rotation operation unit 2 and is grounded.

In the present embodiment, the voltage V is supplied to the switching unit 28 via the moderation mechanism 6, but the voltage V is not limited to this, and the voltage V may be supplied via the support shaft 830. Further, as a modification, the movable electrode 24 is not limited to the upper part of the switching portion 28, and may be arranged above the transmission portion 26 or the like. Further, a plurality of moderation mechanisms 6 may be provided.

As shown in FIG. 4A, the rotation operation unit 2 rotates in the forward direction (arrow A direction) and the reverse direction (arrow B direction) with reference to θ = 0 °. Even if the rotation operation unit 2 is rotated in the forward direction and the reverse direction by the moderation mechanism 6, the center of the switching unit 28 is located at the center of the first light receiving unit 41. The first light receiving portion 41, when rotated 15 ° in the forward and reverse, as described later, is configured to received signal S ₂ is switched to the "Lo" from the "Hi". The rotation detection device 1 can use the moderation position as a reference (θ = 0 °) when other settings are switched or when the power is turned on.

(Configuration of photo sensor unit 5)
As shown in FIG. 3C, the photosensor unit 5 is roughly configured with a base 50, a first wall portion 51, and a second wall portion 52. The first wall portion 51 and the second wall portion 52 stand up from both ends of the base 50 in the same direction and face each other. A light emitting portion 3 is arranged on the first wall portion 51. A first light receiving portion 41 and a second light receiving portion 42 are arranged on the second wall portion 52. The light emitting unit 3 is arranged at a position where the vertical line at the center of the straight line connecting the first light receiving unit 41 and the second light receiving unit 42 and the first wall portion 51 intersect. Therefore, the first light receiving unit 41 and the second light receiving unit 42 simultaneously receive the light output from the light emitting unit 3 if there is no obstruction.

Emitting unit 3 is configured to output light to the second wall portion 52 direction on the basis of the drive signal S ₁ output from the control unit 10. The light emitting unit 3 is composed of, for example, a light emitting diode that outputs light.

The first light receiving unit 41 and the second light receiving unit 42 are composed of a photodiode that receives light and converts it into an electric signal. _{As shown in FIG. 4B, the first light receiving unit 41 outputs a light receiving signal S 2} which is “Hi” when receiving light and “Lo” when not receiving light to the control unit 10. .. _{The second light receiving unit 42 outputs a light receiving signal S 3} which becomes “Hi” when receiving light and “Lo” when not receiving light to the control unit 10.

As shown in FIG. 4A, the end portion of the base portion 22 is inserted into the gap 53 between the first wall portion 51 and the second wall portion 52. That is, the transmission unit 26 and the switching unit 28 are alternately positioned in the gap 53 due to the rotation of the rotation operation unit 2. Therefore, the light receiving unit 4 may or may not receive light depending on the transmission unit 26 and the switching unit 28 due to the rotation of the rotation operation unit 2.

As shown in FIGS. 4 (a) and 4 (b), the first light receiving unit 41 and the second light receiving unit 42 are arranged so that _{the phases of the light receiving signal S 2} and the light receiving signal S ₃ are shifted by a quarter. Have been placed. In the present embodiment, since the transmission unit 26 and the switching unit 28 are lined up at intervals of 30 °, the phases are out of phase by 7.5 °. The control unit 10 determines the rotation direction and the operation amount of the rotation operation unit 2 based on this phase shift. As a modification, a plurality of photo sensor units 5 may be provided.

(Structure of control unit 10)
The control unit 10 is composed of, for example, a CPU (Central Processing Unit) that performs calculations and processing on the acquired data according to a stored program, a RAM (Random Access Memory) that is a semiconductor memory, a ROM (Read Only Memory), and the like. It is a microcomputer that is used. In this ROM, for example, a program for operating the control unit 10 is stored. The RAM is used, for example, as a storage area for temporarily storing a calculation result or the like. Further, the control unit 10 has a means for generating a clock signal inside the control unit 10, and operates based on the clock signal.

The control unit 10 determines the rotation direction and the operation amount of the rotation operation unit 2 based on the _{light receiving signal S 2} and the light receiving signal S ₃ acquired from the light receiving unit 4. The control unit 10 generates operation information S4 based on the determined rotation direction and operation amount, _{and outputs the operation information S 4} to the main control unit 85 of the control device 8.

The main control unit 85 comprehensively controls the switch 82 of the control device 8, the display 84, the rotation detection device 1, and the like. _{The main control unit 85 outputs the instruction information S 6} based on the operation of the rotation detection device 1 and the operation of the switch 82 to the air conditioner 7.

When the rotation operation unit 2 is not rotated, the switching unit 28 is located in the gap 53 of the photosensor unit 5 by the moderation mechanism 6. The control unit 10 applies a voltage V to the switching unit 28 located in the gap 53 via the moderation mechanism 6 to increase the transmittance of the switching unit 28. The control unit 10 outputs to emit driving signals S ₁ to the light emitting portion 3. The rotation detection device 1 may be configured to apply a voltage V to at least the switching unit 28 located in the gap 53. For example, the rotation detection device 1 is configured to apply the voltage V to a plurality of switching units 28 including the switching unit 28. It may be.

When the light receiving unit 4 receives light during the non-rotation operation, the control unit 10 determines that the light emitting unit 3, the light receiving unit 4, and the switching unit 28 are normal. Specifically, as described above, the control unit 10 applies a voltage V to the switching unit 28 via the moderation mechanism 6 to switch the transmittance to a high level and controls the light emitting unit 3 to output light. The light receiving unit 4 receives the light and outputs the light receiving signal S ₂ and the light receiving signal S ₃ which become “Hi” to the control unit 10. The control unit 10 determines that the light emitting unit 3, the light receiving unit 4, and the switching unit 28 are normal by the input of the light _{receiving signal S 2} and the light receiving signal S _{3 which are the “Hi”.}

Here, for example, when the light emitting unit 3 cannot output light, the light receiving signal S ₂ and the light receiving signal S ₃ output by the light receiving unit 4 do not become “Hi”, so that the control unit 10 determines that a failure has occurred. .. In this case, at least one failure of the light emitting unit 3, the first light receiving unit 41 and the second light receiving unit 42, or the switching unit 28 is considered. The failure of the switching unit 28 includes a poor continuity between the fixed electrode 60 and the movable electrode 24.

Further, for example, when at least one of the first light receiving unit 41 and the second light receiving unit 42 does not output "Hi", the control unit 10 determines that a failure has occurred. In this case, it is possible that the light receiving unit that does not output "Hi" is out of order.

Further, for example, when the switching unit 28 does not switch in a state where the transmittance is low even when the voltage V is applied, the light receiving signal S ₂ and the light receiving signal S ₃ output by the light receiving unit 4 do not become “Hi”, so that the control unit 10 determines that a failure has occurred. In this case, at least one failure of the light emitting unit 3, the first light receiving unit 41 and the second light receiving unit 42, or the switching unit 28 is conceivable, as in the case where the light emitting unit 3 cannot output light.

Control unit 10 performs determination failure when not rotating operation, and outputs the result signal S ₅ indicating the result, the vehicle control unit 9 via the main control unit 85. The result signal S _5, as an example, fault "Lo" and if is not detected, but the case where it is detected as a signal that the "Hi" is not limited to this. The main control unit 85, the result signal S ₅ becomes "Hi" may enter, failure to notify the user by a display or sound that has occurred. Note that the notification may be made by the vehicle control unit 9.

Hereinafter, an example of the failure detection operation of the rotation detection device 1 of the present embodiment will be described with reference to the flowchart of FIG. Rotation detecting device 1, and performs the detection operation of the failure based on the failure detection instruction signal S ₇ output from the vehicle control unit 9 the power cycle of the vehicle as a trigger. As a modification, the rotation detection device 1 may perform failure detection triggered by turning on its own power, or may perform failure detection periodically and when the non-rotation operation continues for a certain period of time. , Further, these may be combined, and the present invention is not limited to this.

(motion)
Control unit 10 of the rotation detecting device 1 is "Yes" is established in step 1, i.e. the power of the vehicle is turned on and fault detection instruction signal S ₇ for instructing the failure detection from the vehicle control unit 9 inputs (Step1: Yes), a voltage V is applied to the switching unit 28 via the moderation mechanism 6 to switch the transmittance at the time of non-rotation operation (Step 2). By applying this voltage V, the transmittance of the switching unit 28 becomes high, and light is transmitted.

Next, the control unit 10 outputs a drive signals _{S 1} to the light emitting unit 3 to output a light from the light emitting portion 3 (Step3).

Next, the control unit 10 monitors the _{light receiving signal S 2} and the light receiving signal S ₃ input from the light receiving unit 4. When the light receiving signal S ₂ and the light receiving signal S ₃ both become "Hi" and the light receiving unit 4 normally receives light (Step 4: Yes), the control unit 10 determines that there is no failure and shows the determination result. and it generates a signal _{S 5} and outputs to the main control unit 85 (Step5). The result signal S ₅ may be output to the vehicle control unit 9 even if there is no failure.

Here, in step 4, when _{at least one of the light receiving signal S 2} and the light receiving signal S ₃ is not "Hi" (Step 4: No), the _{control unit 10 determines that there is a failure, and receives a result signal S 5 indicating the determination result.} It is generated and output to the main control unit 85 (Step 6).

(Effect of embodiment)
The rotation detection device 1 according to the present embodiment can detect a failure during a non-rotation operation. Specifically, in the rotation detection device 1, the light transmittance is switched so that the switching unit 28 transmits light when the switching unit 28 is not rotated. Therefore, as compared with the case where this configuration is not adopted, the light receiving unit is used when the switching unit 28 is not rotated. When at least one of the first light receiving unit 41 and the second light receiving unit 42 of 4 does not receive the light of the light emitting unit 3, it is said that at least one of the light emitting unit 3, the light receiving unit 4 and the switching unit 28 has failed. Can be determined.

Since the rotation detection device 1 detects the failure before the control device 8 is operated, it is possible to quickly output the presence or absence of the failure to the vehicle side as compared with the case where this configuration is not adopted.

The rotation detection device 1 of the above embodiment has a configuration in which the user grips the knob portion 20 and rotates the rotation operation unit 2, that is, the user directly grips the rotation operation unit 2 and operates the rotation. Not limited. As an example, the rotation detection device 1 detects the rotation of the rotation operation unit 2 that indirectly rotates via a steering wheel or the like that the user rotates, and the rotation operation unit 2 that rotates directly or indirectly by a drive source. It may be configured as a rotation sensor that detects rotation and the like.

Although some embodiments and modifications of the present invention have been described above, these embodiments and modifications are merely examples and do not limit the invention according to the claims. These novel embodiments and modifications can be implemented in various other embodiments, and various omissions, replacements, changes, etc. can be made without departing from the gist of the present invention. Moreover, not all combinations of features described in these embodiments and modifications are essential as means for solving the problems of the invention. Further, these embodiments and modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Rotation detection device, 2 ... Rotation operation unit, 3 ... Light emitting unit, 4 ... Light receiving unit, 5 ... Photosensor unit, 6 ... Moderation mechanism, 7 ... Air conditioning device, 8 ... Control device, 9 ... Vehicle control unit, 10 ... control unit, 20 ... knob unit, 22 ... base unit, 24 ... movable electrode, 26 ... transmission unit, 27 ... fin, 28 ... switching unit, 41 ... first light receiving unit, 42 ... second light receiving unit, 50 ... Base, 51 ... 1st wall, 52 ... 2nd wall, 53 ... Gap, 60 ... Fixed electrode, 80 ... Operation panel, 81 ... Through hole, 82 ... Switch, 83 ... Board, 84 ... Display, 85 ... main control unit, 200 ... rotating shaft, 220 ... side surface, 800 ... surface, 810 ... inner surface, 830 ... support shaft

Claims (5)

A rotation operation unit that accepts rotation operations and
A light emitting part that outputs light and
A light receiving unit that is arranged so as to face the light emitting unit and receives the light.
A transmission unit provided in the rotation operation unit so as to move between the light emitting unit and the light receiving unit in accordance with the rotation operation and transmitting the light.
It is provided in the rotation operation unit adjacent to the transmission unit, faces the light emitting unit and the light receiving unit during the non-rotation operation of the rotation operation unit, transmits the light during the non-rotation operation, and transmits the light during the rotation operation. A switching unit that switches the transmittance of the light so as to block the light,
When the light transmittance of the switching unit is controlled and the light receiving unit does not receive the light of the light emitting unit during the non-rotation operation, at least one of the light emitting unit, the light receiving unit, and the switching unit is used. A control unit that determines that a failure has occurred, and
Rotation detector equipped with. When the light receiving unit receives the light during the non-rotation operation, the control unit determines that the light emitting unit, the light receiving unit, and the switching unit are normal.
The rotation detection device according to claim 1. In the switching unit, no voltage is applied during the rotation operation, the transmittance of the light is lowered to block the light, and during the non-rotation operation, a voltage is applied to increase the transmittance of the light. A transparent display that transmits light,
The rotation detection device according to claim 1 or 2. The switching unit faces the light emitting unit and the light receiving unit when the rotation operation is not performed by the moderation mechanism of the rotation operation unit.
The rotation detection device according to any one of claims 1 to 3. The rotation operation unit is a rotating body that accepts rotation operations.
The transmission portion and the switching portion are continuously and alternately provided along the outer circumference of the rotation operation portion.
The rotation detection device according to any one of claims 1 to 4.

Images