JPWO2019102582A1 - Hand drying equipment - Google Patents

Abstract

The hand dryer (1) is attachable to and detachable from the main body box (3), and has a water receiver (11) for collecting water blown from the hand inserted into the treatment space, an infrared light emitting element for emitting infrared rays, and an infrared ray. A hand detection sensor (10) having an infrared light receiving element that outputs a signal indicating the amount of received light and whether or not a hand is inserted in the processing space, and when the hand is inserted in the processing space, a high voltage is detected. A control unit (20) for driving the air generator (4), and the control unit (20) uses an upper limit threshold value used for determining whether or not a hand is inserted in the processing space as the hand detection sensor (10). ) Is updated periodically based on the reference value based on the sensor input value, which is the amount of received infrared light indicated by the signal input from (4). It is determined that the sensor input value is (3) when the water receiving portion (11) is less than the lower limit threshold used for determining whether or not mounted stops updating the upper threshold.

Description

  TECHNICAL FIELD The present invention relates to a hand drying device that blows airflow onto a wet hand to dry it.

  In order to maintain the hands in a sanitary condition, not only the hand washing treatment but also the drying treatment after washing needs to be performed hygienically. In order to dry the washed hands hygienically, instead of using a towel or handkerchief to wipe the wet hands after washing, a high-speed air stream is sprayed on the hands to blow off the water adhering to the hands, A hand drying device for drying is used.

  In the hand drying device, a concave hand insertion portion is provided in a housing, and a hand detection sensor including an infrared light emitting element and an infrared light receiving element is provided in the hand insertion portion, in addition to the air nozzle. . When the hand detection sensor detects that a hand has been inserted into the processing space in the hand insertion unit, the high-pressure air generating device operates, and the high-pressure air is converted into a high-speed air flow and is ejected from the air nozzle. When the hand detection sensor detects that the hand has been removed from the hand insertion section, the high-pressure air generator is stopped, and the ejection of the high-speed airflow from the air nozzle stops.

  In the hand detection sensor composed of an infrared light emitting element and an infrared light receiving element, the light emitting direction of the infrared light emitting element and the light receiving direction of the infrared light receiving element have an angle, and the infrared light emitted from the infrared light emitting element is transmitted to the water below the hand insertion portion. The light is reflected by the receiving portion, and the reflected light is received by the infrared light receiving element. When a hand is inserted into the detection range of the hand insertion section, infrared rays are reflected by a hand located closer to the hand detection sensor than the water receiving section, and the amount of light received by the infrared light receiving element increases. In other words, the hand detection sensor detects the hand inserted into the hand insertion part when the amount of light received by the infrared light receiving element increases compared to when the light emitted by the infrared light emitting element is reflected by the water receiving part. It is possible. In the hand drying device, when the hand detection sensor detects that the hand has been inserted into the hand insertion portion, the high-pressure air generation device is driven.

  Patent Literature 1 discloses a hand drying device in which a water receiving portion is detachable so that cleaning of a hand drying device main body and a water receiving portion is facilitated.

Japanese Patent No. 3970762

  In the hand drying device disclosed in Patent Document 1, when the removed water receiving portion is attached, the amount of light received by the infrared light receiving element increases due to the reflection of infrared light at the water receiving portion. However, there is a problem that a hand is inserted erroneously and a malfunction occurs.

  The present invention has been made in view of the above, and an object of the present invention is to provide a hand drying device that prevents erroneous detection that a hand has been inserted into a hand insertion portion due to attachment and detachment of a water receiving portion. .

  In order to solve the above-described problems and achieve the object, the present invention provides a main body box provided with a concave hand insertion portion on the front surface, and high-pressure air installed inside the main body box to generate high-pressure air. A generator, a nozzle that converts high-pressure air into a high-speed air flow and blows out to the processing space in the hand insertion section, and is detachable from the main body box, and high-speed air is inserted from the hand inserted into the processing space inside the hand insertion section. A water receiving unit for collecting water blown off by the flow, an infrared light emitting element for emitting infrared light, and an infrared light receiving element for outputting a signal indicating the amount of received infrared light, and a hand detection sensor installed above the hand insertion unit And a controller that determines whether or not a hand is inserted into the processing space, and drives the high-pressure air generator when a hand is inserted into the processing space. The control unit sets an upper limit threshold value, which is a threshold value of the amount of received infrared light used to determine whether a hand is inserted into the processing space, to a sensor input value, which is a received light amount of infrared light indicated by a signal input from the hand detection sensor. The sensor input value is periodically updated based on the reference value, and if the sensor input value is equal to or greater than the upper threshold, it is determined that the hand is inserted in the processing space, and the sensor input value is If it is less than or equal to the lower threshold, which is the threshold of the amount of infrared light used to determine whether the receiver is attached, it is determined that the water receiver has been removed from the main body box, and the upper threshold is updated. Stop.

  The hand drying device according to the present invention has an effect that it is possible to prevent erroneous detection that a hand has been inserted into the hand insertion portion due to attachment and detachment of the water receiving portion.

Longitudinal sectional view of the hand drying device according to Embodiment 1 of the present invention. Exploded perspective view of a hand drying device according to Embodiment 1. 5 is a flowchart illustrating a flow of a process of hand detection determination of the hand drying device according to the first embodiment. Time chart of hand detection determination of the hand drying device according to the first embodiment 5 is a flowchart showing a flow of a hand detection determination process of the hand drying device according to the second embodiment of the present invention. Time chart of hand detection determination of hand drying device according to Embodiment 2 The figure which shows the structure which implement | achieved the function of the control part which concerns on any one of Embodiment 1 to Embodiment 4 with hardware. The figure which shows the structure which realized the function of the control part which concerns on any one of Embodiment 1 to Embodiment 4 with software.

  Hereinafter, a hand dryer according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1 FIG.
FIG. 1 is a vertical cross-sectional view of the hand dryer according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the hand drying device according to the first embodiment. The hand drying device 1 according to the first embodiment has a main body 3 in which a hand insertion portion 2 which is a concave portion having an open front surface is formed. The main body box 3 incorporates a high-pressure air generator 4. The high-pressure air generated by the high-pressure air generator 4 is supplied to the air nozzle 5. Moisture adhering to the hand inserted into the processing space in the hand insertion section 2 is blown off by the high-speed air flow ejected from the air nozzle 5.

  The high-pressure air generator 4 is configured by unitizing a motor 7 which is a DC brushless motor or a commutator motor, and a turbo fan (not shown) rotated by the motor 7.

  An air nozzle 5 that converts high-pressure air sent from the high-pressure air generator 4 into a high-speed air flow and blows out the processing space in the hand insertion unit 2 is connected to an outlet of the high-pressure air generator 4. The air nozzle 5 is assembled into an opening formed at the upper edge of the hand insertion port of the hand insertion section 2 with the ejection port facing downward. The air nozzle 5 blows a high-speed air stream to the hand inserted into the processing space in the hand insertion unit 2 to separate water drops adhering to the hand from the hand without rubbing the hands and blow off.

  On the rear side of the upper jaw 8 provided above the hand insertion portion 2 where the air nozzle 5 is installed, a light transmitting member is fitted to form a window 9. A hand detection sensor 10 for detecting a hand is disposed in the window 9.

  The hand detection sensor 10 includes an infrared light emitting element that emits infrared light, and an infrared light receiving element that outputs a signal indicating the amount of received infrared light. The hand detection sensor 10 is provided with an infrared light emitting element so as to emit light from the upper jaw 8 toward the water receiver 11. When no hand is inserted into the processing space in the hand insertion unit 2, the infrared light receiving element receives infrared light emitted from the infrared light emitting element and reflected by the water receiving unit 11, and outputs a signal indicating the amount of received infrared light. Output to the control unit 20. Hereinafter, the received light amount indicated by the signal input to the control unit 20 from the infrared light receiving element is referred to as a sensor input value. When a hand is inserted into the hand insertion section 2, light emitted from the infrared light emitting element is reflected by the hand, and the sensor input value increases. At this time, if the sensor input value exceeds the upper threshold which is the threshold of the amount of infrared light used to determine whether or not a hand is inserted into the processing space in the hand insertion unit 2, the processing space in the hand insertion unit 2 It is determined that a hand has been inserted into.

  The sensor input value fluctuates depending on the environment in which the hand dryer 1 is installed, such as irradiation of sunlight or light from illumination. Therefore, in order to ignore the influence of the environment in which the hand drying device 1 is installed, the sensor input value is set as an upper threshold which is a threshold for determining that a hand is inserted into the processing space in the hand insertion unit 2. A value obtained by adding a first fixed value to a reference value, which is the average value of. The upper limit threshold is updated periodically and is set to a threshold that matches the situation of the surrounding environment. The upper threshold update cycle can be exemplified every 6.4 seconds, but is not limited to this.

  The upper jaw 8 determines whether or not a hand is inserted into the processing space in the hand insertion unit 2 based on a signal input from the hand detection sensor 10, and the hand is inserted into the processing space. In such a case, a control unit 20 for driving the high-pressure air generator 4 is provided. When the hand detection sensor 10 detects that a hand has been inserted into the processing space in the hand insertion unit 2, the control unit 20 operates the high-pressure air generation device 4 to supply a high-speed airflow to the processing space in the hand insertion unit 2. Injects and blows away moisture on hands.

  The water blown from the hand is collected in the water receiving section 11 below the hand insertion section 2. The water receiving portion 11 is provided with an opening 11b communicating with a communication path 11a connected to the drain container 12. The water receiving portion 11 is provided with a gradient that goes down toward the opening 11b, and water adhering to the water receiving portion 11 flows from the opening 11b into the communication path 11a, and is stored in the drain container 12 through the communication path 11a. Can be

  As shown in FIG. 2, the water receiving portion 11 and the drain container 12 are detachable from the main body box 3. By removing the water receiving portion 11 and the drain container 12 from the main body box 3, the water receiving portion 11, the drain container 12, and the main body box 3 can be easily cleaned.

  In the control unit 20, a lower limit threshold value that is a threshold value of the amount of infrared light received used to determine whether the water receiving unit 11 is attached to the main body box 3 is set. The lower threshold is set to a value obtained by subtracting the second fixed value from the reference value in order to ignore the influence of the surrounding environment, similarly to the upper threshold. The lower threshold is periodically updated and set to a threshold that matches the situation of the surrounding environment. The update cycle of the lower threshold can be exemplified every 6.4 seconds, but is not limited thereto.

  FIG. 3 is a flowchart illustrating a flow of a process of hand detection determination of the hand drying device according to the first embodiment. When the power is turned on, a hand detection determination process is started. In step S1, the control unit 20 updates the reference value. In step S2, the control unit 20 sets an upper threshold and a lower threshold. The control unit 20 sets a value obtained by adding the first fixed value to the reference value as the upper threshold, and sets a value obtained by subtracting the second fixed value from the reference value as the lower threshold. In step S3, the control unit 20 determines whether the first set time has elapsed after setting the upper threshold and the lower threshold. If the first set time has not elapsed after updating the upper threshold and the lower threshold, the process proceeds to step S4. If the first set time has elapsed after updating the upper threshold and the lower threshold, the process proceeds to step S6.

  In step S6, the control unit 20 determines whether the water receiving unit 11 is attached to the main body box 3. If the sensor input value is equal to or greater than the lower threshold, the determination in step S6 is Yes, the control unit 20 determines that the water receiving unit 11 is attached to the main body box 3, and proceeds to step S1. If the sensor input value is less than the lower threshold, the determination in step S6 is No, and the controller 20 determines that the water receiver 11 is not attached to the main body box 3, and proceeds to step S4.

  In step S4, the control unit 20 determines whether or not a hand has been inserted into the processing space in the hand insertion unit 2. If the sensor input value is below the upper threshold, the control unit 20 determines that a hand has not been inserted into the processing space in the hand insertion unit 2, and returns to step S3. If the sensor input value is equal to or greater than the upper threshold, the control unit 20 determines that the hand is inserted into the processing space in the hand insertion unit 2, and proceeds to step S5. In step S5, the control unit 20 drives the motor 7 for a certain time, and proceeds to step S3.

FIG. 4 is a time chart of the hand detection determination of the hand drying device according to the first embodiment. In FIG. 4, the change in the upper threshold is indicated by a bold broken line, the change in the lower threshold is indicated by a dashed line, and the sensor input value is indicated by a solid line. Time interval at time _{t 0, t 1, t 2} , t 3, t 4, t 5, t 6, t 7, t 8, t 9, t 10 is the update cycle of the upper and lower thresholds. At time t _1, the control unit 20 updates the reference value, is also updated further upper and lower thresholds. At time _t1a , the water receiver 11 is removed from the main body box 3, and the sensor input value falls below the lower threshold. At time t _2, t _3, since the sensor input value is below the lower threshold, the control unit 20 is to update the reference value, upper threshold and lower threshold is not updated. At time _t3a , the control unit 20 drives the motor 7 because the sensor input value is equal to or greater than the upper threshold. At times t ₄ and t ₅ , since the sensor input value is below the lower threshold, the controller 20 updates the reference value, but does not update the upper threshold and the lower threshold. At time _t5a , the water receiver 11 is attached to the main body box 3, and the sensor input value becomes equal to or higher than the lower threshold. At times t ₆ , t ₇ , t ₈ , t ₉ , and t ₁₀ , the control unit 20 updates the reference value, and further updates the upper threshold and the lower threshold.

In FIG. 4, the change of the upper limit threshold value in the hand dryer in which the lower threshold value is not set is also indicated by a thin broken line. Hand drying apparatus which does not set the lower threshold, after the water receiving part is detached from the main body box body at time t _1a, at time _{t 2, t 3, t 4} , t 5, the water receiving portion removed from the main body box body The reference value is updated on the basis of the sensor input value in the state of being reset, and the upper limit threshold is updated. Accordingly, the water receiving portion at the time t _5a is when mounted to the body box member, so the sensor input value is equal to or more than the upper limit threshold value, the motor of the high-pressure air generating device is driven at time t _6. That is, when the water receiving portion removed from the main body box is attached to the main body box, it is erroneously detected that the hand is inserted into the processing space in the hand insertion portion.

  In the hand drying device 1 according to the first embodiment, the control unit 20 determines that the water receiving unit 11 is detached from the main body box 3 when the sensor input value is lower than the lower threshold, and Stop updating the lower threshold. In the hand dryer 1 according to Embodiment 1, if the sensor input value is equal to or larger than the lower threshold at the time of updating the upper threshold and the lower threshold, the control unit 20 updates the upper threshold and the lower threshold. To resume. Therefore, in the hand drying device 1 according to the first embodiment, since the upper threshold is not updated while the water receiving unit 11 is removed from the main body box 3, the water receiving unit 11 removed from the main body box 3 is not updated. Even if is attached to the main body box 3, the sensor input value does not exceed the upper threshold value. Therefore, the hand drying device 1 according to the first embodiment erroneously assumes that a hand is inserted into the processing space in the hand insertion unit 2 due to an increase in sensor input value when the water receiving unit 11 is attached to the main body box 3. The determination can be prevented.

  When the sensor input value falls below the lower threshold for a certain period of time, the control unit 20 performs a process of emitting at least one of an alarm light and an alarm sound to notify the user that the water receiving unit 11 is not mounted. May be. By emitting an alarm light or an audible alarm when the water receiver 11 is not mounted, the user can be urged to re-install when the water receiver 11 is dropped. Further, when the sensor input value falls below the lower limit threshold for a certain period, the control unit 20 may reduce the operation intensity of the high-pressure air generator 4 or stop the operation. The amount of water blown from the hand without the water receiver 11 by reducing the operation intensity of the high-pressure air generator 4 or stopping the operation when the water receiver 11 is not mounted. And water is less likely to scatter on the floor.

Embodiment 2 FIG.
The configuration of the hand drying device 1 according to the second embodiment of the present invention is the same as that of the hand drying device 1 according to the first embodiment. The hand dryer 1 according to Embodiment 2 fixes the lower threshold to the third fixed value regardless of the reference value. In addition, in the hand drying device 1 according to the second embodiment, if the water receiving unit 11 is detached when the power is turned on, the sensor input value falls below the lower limit threshold. It is determined that the box 3 has been removed. At this time, the control unit 20 sets the upper threshold to the fourth fixed value regardless of the reference value.

  FIG. 5 is a flowchart illustrating a flow of a process of hand detection determination of the hand drying device according to the second embodiment. When the power is turned on, the control unit 20 determines whether the water receiving unit 11 is attached to the main body box 3 in step S11. If the sensor input value is equal to or greater than the third fixed value that is the lower threshold, the control unit 20 determines that the water receiving unit 11 is attached to the main body box 3, and proceeds to step S12. In step S12, the control unit 20 updates the reference value. In step S13, the control unit 20 sets the upper threshold value to a value obtained by adding the first fixed value to the reference value, and proceeds to step S15.

  In step S11, when the sensor input value is lower than the third fixed value which is the lower threshold, the control unit 20 determines that the water receiving unit 11 is not attached to the main body box 3, and proceeds to step S14. move on. In step S14, the control unit 20 sets the upper limit threshold to a fourth fixed value, and proceeds to step S15.

  In step S15, the control unit 20 determines whether a first set time has elapsed since the setting of the upper limit threshold. If the first set time has elapsed after setting the threshold, the process proceeds to step S16. In step S16, the control unit 20 determines whether the water receiving unit 11 is attached to the main body box 3. If the sensor input value is equal to or larger than the lower threshold, the control unit 20 determines that the water receiving unit 11 is attached to the main body box 3, and proceeds to step S17. In step S17, the control unit 20 updates the reference value. In step S18, the control unit 20 updates the upper threshold, and proceeds to step S15. The upper threshold is set to a value obtained by adding a first fixed value to a reference value. If the sensor input value is less than the lower threshold in step S16, the control unit 20 determines that the water receiving unit 11 is not attached to the main body box 3, and proceeds to step S19. In step S15, if the first set time has not elapsed since the setting of the upper limit threshold, the process proceeds to step S19, and the control unit 20 performs hand detection determination. If the sensor input value is lower than the upper threshold, the control unit 20 determines that a hand has not been inserted into the processing space in the hand insertion unit 2, and returns to step S15. If the sensor input value exceeds the upper limit threshold, the control unit 20 determines that the hand is inserted into the processing space in the hand insertion unit 2 and drives the motor 7 for a predetermined time in step S20, and proceeds to step S15. Proceed to.

  According to the above procedure, it is possible to determine whether or not the water receiving section 11 is attached when the power is turned on. Further, even when the water receiving unit 11 is attached after the power is turned on, it is possible to prevent the erroneous determination that the hand is inserted into the processing space in the hand inserting unit 2.

FIG. 6 is a time chart of the hand detection determination of the hand drying device according to the second embodiment. In FIG. 6, the change of the upper threshold is indicated by a bold broken line, the change of the lower threshold is indicated by a dashed-dotted line, and the sensor input value is indicated by a solid line. The time intervals of times t ₀ , t ₁ , t ₂ , t ₃ , t ₄ , t ₅ , t ₆ , and t ₇ are the upper threshold update periods. At time t _0, but power is turned on, the sensor input values for below the lower threshold value, an upper limit threshold value to the fourth fixed value. At times t ₁ and t ₂ , the control unit 20 updates the reference value, but does not update the upper threshold. At time _t2a , when water receiver 11 is attached to main body box 3, the sensor input value exceeds the lower threshold. At times t ₃ , t ₄ , and t ₅ , the control unit 20 updates the reference value and further updates the upper threshold. At time _t5a , the water receiver 11 is removed from the main body box 3, and the sensor input value falls below the lower threshold. At times t ₆ and t ₇ , since the sensor input value is below the lower threshold, the control unit 20 updates the reference value but does not update the upper threshold.

In FIG. 6, a change in the upper limit threshold value in the hand drying device 1 according to the first embodiment is indicated by a thin broken line, and a change in the lower limit threshold value is indicated by a thin dashed line. In the hand drying apparatus 1 according to the first embodiment, the control unit 20 when the power is turned on at time t ₀ is set to a value based the upper and lower thresholds to a reference value. Therefore, at time t ₀ , t ₁ , and t _{2 at} which the water receiver 11 is detached, the hand dryer 1 according to the first embodiment has a time t at which the water receiver 11 is attached to the main body box 3. _{3, t} 4, the reference value is smaller than _{t 5,} upper and lower thresholds is a value smaller than the time _{t 3,} t 4, _{t 5} the water receiving unit 11 is attached to the main body box body 3 Is set. At time t _2a of water receiving unit 11 is attached to the main body box body 3, upper and lower thresholds, the time the water receiving unit 11 is attached to the main body box body 3 t _3, t _4, upper than t ₅ and lower thresholds are set to a small value, when the water receiving unit 11 is attached to the body box member 3, since the sensor input value exceeds the upper threshold, at time t _3, the control unit 20, the hand insertion portion It is erroneously detected that a hand is inserted in the processing space in the second.

  In the hand drying device 1 according to the second embodiment, the sensor input value is lower than the upper threshold even when the water receiving unit 11 is attached to the main body box 3 in a state where the upper threshold is set to the fourth fixed value. The control unit 20 does not erroneously detect that a hand is inserted in the processing space in the hand insertion unit 2. When the water receiving unit 11 is attached to the main body box 3, the sensor input value exceeds the lower threshold value, so the control unit 20 starts updating the upper threshold value, and determines whether the water receiving unit 11 is attached to the main body box 3. It is possible to determine whether or not it is.

Embodiment 3 FIG.
The configuration of the hand drying device according to the third embodiment of the present invention is the same as that of the second embodiment. In the hand dryer according to the third embodiment, the lower threshold is set to the third fixed value only when the power is turned on. When the power is turned on, the sensor input value that is lower than the lower threshold becomes the power. For the first time after the power is turned on, when the value becomes equal to or higher than the lower threshold, the lower threshold is set to a value obtained by subtracting the second fixed value from the reference value.

  The hand dryer according to the third embodiment can determine whether or not the water receiver 11 is attached when the power is turned on. Even when the water receiving portion 11 is detached from the main body box 3 when the power is turned on, and the water receiving portion 11 is later attached to the main body box 3, the hand is inserted into the processing space in the hand insertion portion 2. Erroneous determination that there is In addition, when the water receiving portion 11 removed from the main body box 3 when the power is turned on is attached to the main body box 3 later, the lower threshold is updated to a value calculated based on the reference value. Therefore, it is possible to increase the accuracy of determining whether or not the water receiving portion 11 is attached to the main body box 3 in consideration of the influence of the surrounding environment.

Embodiment 4 FIG.
The configuration of the hand drying apparatus according to Embodiment 4 of the present invention is the same as that of Embodiment 2. In the hand drying apparatus according to Embodiment 4, the control unit 20 stores the reference value in a nonvolatile manner, and when the power is turned on, the upper limit threshold and the lower limit threshold are calculated based on the stored reference value. Set the value to

  The reference value that is non-volatilely stored by the control unit 20 can be, for example, an average value of the reference values in a state where the power is turned on last time and the water receiving unit 11 is attached to the main body box 3. Note that the reference value that is non-volatilely stored by the control unit 20 may be the median value of the reference values when the power supply is turned on last time and the water receiving unit 11 is attached to the main body box 3. .

  The hand dryer according to the fourth embodiment uses the average value of the reference values stored in a non-volatile manner for setting the upper threshold and the lower threshold when the power is turned on. Therefore, the upper and lower thresholds when the power is turned on. It is possible to set a threshold value with higher accuracy than setting a fixed value as the threshold value.

  The functions of the control unit 20 according to the first to fourth embodiments are realized by a processing circuit. The processing circuit may be dedicated hardware or an arithmetic device that executes a program stored in a storage device.

  If the processing circuit is dedicated hardware, the processing circuit may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an application specific integrated circuit, a field programmable gate array, or a combination thereof. Is applicable. FIG. 7 is a diagram illustrating a configuration in which the function of the control unit according to any of the first to fourth embodiments is implemented by hardware. The processing circuit 29 incorporates a logic circuit 29a for realizing the function of the control unit 20.

  When the processing circuit 29 is an arithmetic unit, the function of the control unit 20 is realized by software, firmware, or a combination of software and firmware.

  FIG. 8 is a diagram illustrating a configuration in which the function of the control unit according to any of the first to fourth embodiments is implemented by software. The processing circuit 29 includes an arithmetic unit 291 that executes the program 29b, a random access memory 292 used by the arithmetic unit 291 for a work area, and a storage device 293 that stores the program 29b. The function of the control unit 20 is realized by the arithmetic unit 291 developing and executing the program 29b stored in the storage device 293 on the random access memory 292. Software or firmware is described in a programming language and stored in the storage device 293. The arithmetic unit 291 can be, but is not limited to, a central processing unit.

  The processing circuit 29 implements the function of the control unit 20 by reading and executing the program 29b stored in the storage device 293. It can be said that the program 29b causes a computer to execute a procedure and a method for realizing the function of the control unit 20.

  Note that the processing circuit 29 may be partially realized by dedicated hardware, and partially realized by software or firmware.

  As described above, the processing circuit 29 can realize the above-described functions by hardware, software, firmware, or a combination thereof.

  The configurations described in the above embodiments are merely examples of the contents of the present invention, and can be combined with other known technologies, and can be combined with other known technologies without departing from the gist of the present invention. Parts can be omitted or changed.

  1 hand drying device, 2 hand insertion part, 3 main body box, 4 high pressure air generator, 5 air nozzle, 7 motor, 8 upper jaw, 9 window, 10 hand detection sensor, 11 water receiving section, 11a communication path, 11b opening Unit, 12 drain containers, 20 control units, 29 processing circuits, 29a logic circuits, 29b programs, 291 arithmetic units, 292 random access memories, 293 storage devices.

Claims (11)

A main body box body provided with a concave hand insertion part on the front,
A high-pressure air generator that is installed inside the main body box and generates high-pressure air;
A nozzle that converts the high-pressure air into a high-speed air flow and jets the processing space in the hand insertion unit,
A water receiving portion that is detachable from the main body box and collects water blown off by the high-speed air flow from a hand inserted into a processing space inside the hand insertion portion;
An infrared light emitting element that emits infrared light and an infrared light receiving element that outputs a signal indicating the amount of infrared light received, a hand detection sensor installed above the hand insertion unit,
It is determined whether or not a hand is inserted into the processing space, and when a hand is inserted into the processing space, a control unit that drives the high-pressure air generator,
The control unit includes:
An upper threshold which is a threshold of the amount of infrared light received for use in determining whether or not a hand is inserted into the processing space, a sensor input value which is an amount of infrared light indicated by the signal input from the hand detection sensor. Update regularly based on the base values you ’ve set,
If the sensor input value is equal to or greater than the upper threshold, it is determined that a hand is inserted in the processing space,
If the sensor input value is equal to or less than a lower threshold which is a threshold value of an amount of received infrared light used to determine whether or not the water receiver is attached to the main body box, the water receiver may be the main body box. A hand dryer, wherein the hand dryer is determined to have been removed from the body, and updating of the upper threshold is stopped. The control unit periodically updates the lower threshold based on the reference value,
The hand dryer according to claim 1, wherein when the sensor input value is equal to or less than the lower threshold, updating of the lower threshold is stopped.   The control unit sets the lower threshold to a fixed value if the water receiving unit has been removed from the main body box when the power is turned on, and the water receiving unit is attached to the main body box. The method further comprising: updating the lower threshold periodically based on the reference value, and stopping the update of the lower threshold when the sensor input value is equal to or less than the lower threshold. A hand drying device according to claim 1.   2. The hand dryer according to claim 1, wherein the control unit sets the lower threshold to a fixed value.   The controller according to any one of claims 1 to 4, wherein the upper threshold is set to a fixed value if the water receiver is removed from the main body box when power is turned on. The hand drying device according to claim 1.   The control unit stores the past reference value, and when the power is turned on, sets the upper threshold value and the lower threshold value based on the stored reference value stored in the past. Item 2. The hand drying device according to Item 1.   The control unit, if the water receiving unit has been removed from the main body box when power is turned on, based on the stored reference value of the past, the upper threshold and the lower threshold. Setting, after the water receiving portion is attached to the main body box, the upper threshold value and the lower threshold value are periodically updated based on the current reference value. 7. The hand drying device according to any one of items 6 to 6.   The hand dryer according to any one of claims 1 to 7, wherein the control unit performs a process of emitting a warning light when the sensor input value falls below the lower threshold for a certain period of time.   The hand dryer according to any one of claims 1 to 7, wherein the control unit performs a process of issuing an alarm sound when the sensor input value falls below the lower limit threshold for a certain period of time.   The hand according to any one of claims 1 to 7, wherein the control unit reduces the operating intensity of the high-pressure air generator when the sensor input value falls below the lower limit threshold for a certain period. Drying equipment.   The hand according to any one of claims 1 to 7, wherein the control unit stops the operation of the high-pressure air generating device when the sensor input value falls below the lower threshold for a certain period of time. Drying equipment.

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