WO2017130336A1

WO2017130336A1 - Hand dryer

Info

Publication number: WO2017130336A1
Application number: PCT/JP2016/052378
Authority: WO
Inventors: 森　亮二; 浩一郎本間; 荒木　宏
Original assignee: 三菱電機株式会社
Priority date: 2016-01-27
Filing date: 2016-01-27
Publication date: 2017-08-03
Also published as: JP6422601B2; JPWO2017130336A1

Abstract

A hand dryer comprises: a hand insertion section provided on a case (10) that forms the outer wall; a nozzle that is provided in the hand insertion section and that emits an airflow; a hand detection sensor (20) serving as a hand detection unit that continuously detects a hand inserted into the hand insertion section; a blower unit (40) that is housed in the case (10) and that generates an air current that causes an airflow to be emitted from the nozzle; and a control unit (30) that controls the operation of the blower unit (40) in accordance with a detection signal from the hand detection sensor (20). The control unit (30) calculates, from the detection signal from the hand detection sensor (20), the speed of the hand being inserted into and removed from the hand insertion section, and based on the calculated speed, adjusts a delay time for starting or stopping the blower unit (40) from when a hand is inserted into or removed from the hand insertion section. Thus, regardless of the speed that the hand is inserted or removed, water does not readily scatter outside of the product, the next user can use the device immediately, and usability is improved.

Description

Hand dryer

The present invention relates to a hand dryer, and more particularly to a hand dryer that operates by detecting a user's hand.

Conventionally, in one of the hand dryers, that is, the hand dryer, as described in Patent Document 1, a drying chamber formed in a concave shape, and a nozzle portion for injecting air from each surface forming the drying chamber, There has been disclosed a technique that includes a hand detection unit that is disposed near the entrance of a drying chamber and detects a hand entering / exiting the drying chamber, and a fan motor that sends out air ejected from a nozzle unit. In this hand drying apparatus, when the hand detection unit detects insertion of a hand, the fan motor is operated to blow air from the nozzle unit, and when the hand detection unit detects removal of the hand, the operation of the fan motor is stopped. Control is made.

JP 2010-279458 A

However, according to the above conventional technique, if the fan motor is operated and air is ejected from the nozzle portion before the hand is sufficiently inserted into the drying chamber after the hand detection portion detects the hand, the nozzle portion The water adhering to the outer hand is scattered toward the user's face. For this reason, normally, after the hand detection unit detects the hand, the fan motor is operated after a predetermined delay time so that air is blown out from the nozzle unit after it is fully inserted into the drying chamber to the vicinity of the wrist. ing. However, the insertion speed of the hand into the drying chamber varies depending on the user. For this reason, even if the insertion speed of the hand is fast, even if the insertion is completed, air is not ejected from the nozzle portion until the delay time is completed. In some cases, the hand has not been sufficiently inserted before, and there is a problem that air is ejected from the nozzle part during the insertion and water droplets are scattered to the face or the like.

In addition, when removing the hand from the drying chamber, after the hand detection unit detects that there is no hand, the fan motor is stopped after a predetermined delay time and the hand is sufficiently removed from the drying chamber. The fan motor is stopped. In this case as well, even if the hand is pulled out fast enough, even if the hand is fully pulled out, there is still a long delay time until the fan motor stops, so it takes time to stop. Also, if you do not have enough dryness and want to insert your hand again to dry it, or another user who has been waiting for the end of use behind the user in use is still working So you have to wait until it stops. In addition, there is a problem that a person with a slow speed when pulling out the hand ends the delay time before fully pulling out the hand and the fan motor stops.

The present invention has been made in view of the above, and an object of the present invention is to obtain a hand dryer capable of automatically adjusting the operation rise time and the stop delay time.

In order to solve the above-described problems and achieve the object, the present invention provides a manual insertion portion provided in a main body casing that forms an outer shell, a nozzle provided in the manual insertion portion, and a jet of air, and a manual insertion portion. A hand detection unit that continuously detects a hand inserted into the body, a blower unit that is housed in the main body casing and generates an air flow that ejects an air flow from the nozzle, and an operation of the blower unit according to the detection result from the hand detection unit And a control unit for controlling. Based on the detection signal from the hand detection unit, the control unit calculates the speed of the hand inserted / extracted from the hand insertion unit, and based on the calculated speed, from insertion / extraction to the hand insertion unit to starting / stopping the blower unit The delay time is adjusted.

The block diagram which shows the function structure of the hand dryer which concerns on Embodiment 1. FIG. Perspective view showing hand dryer Sectional drawing seen from the vertical cross section extended in parallel with the left-right direction with respect to the hand-drying apparatus of Embodiment 1. Sectional drawing seen from the vertical cross section extended in parallel with the front-back direction with respect to the hand-drying apparatus of Embodiment 1. Explanatory drawing of the principle of the hand detection sensor used in Embodiment 1 Explanatory drawing of the principle of the hand detection sensor used in Embodiment 1 The figure which shows the circuit structure of the hand detection sensor used in Embodiment 1. The graph which plotted the moving average value calculated continuously about the output of the hand detection sensor used in Embodiment 1 Sectional drawing seen from the vertical cross section extended in parallel with the left-right direction with respect to the hand dryer used in Embodiment 2 Sectional drawing seen from the vertical cross section extended in parallel with the front-back direction with respect to the hand dryer used in Embodiment 2 A graph plotting the output of the hand detection sensor used in the second embodiment The graph which plotted the sum signal difference signal in the hand detection sensor used in Embodiment 2 The graph which shows the relationship between the sum signal difference signal and arrival time in the hand detection sensor used in Embodiment 2 The graph which shows the relationship between the sum signal difference signal and arrival time in the hand detection sensor used in Embodiment 2 Sectional drawing seen from the vertical cross section extended in parallel with the front-back direction with respect to the hand-drying apparatus of Embodiment 3.

Hereinafter, a hand dryer according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment, In the range which does not deviate from the summary, it can change suitably. In the drawings shown below, the scale of each layer or each member may be different from the actual for easy understanding, and the same applies to the drawings. Further, even a cross-sectional view may not be hatched for easy viewing of the drawing.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a functional configuration of a hand dryer that is a hand dryer 1 according to Embodiment 1, FIG. 2 is a perspective view showing the hand dryer, and FIGS. It is sectional drawing seen from the vertical cross section extended in parallel with respect to the left-right direction and the front-back direction. FIG. 3 is a view corresponding to the view taken along the AA direction in FIG. 4, but the casing 10 constituting the outline of the hand drying device 1 has a front overhang arranged in the front-rear direction with respect to the user. It has a front flange 10FF that is a part and a rear flange 10RF that is a rear overhang part, and a hand insertion part 11 is formed between them. The housing 10 has a rectangular parallelepiped shape. In the following description, the positive direction along the X axis shown in FIG. 2 will be described as the front-rear direction with the negative direction as the rear, the positive direction along the Y axis as the right, and the negative direction as the left. The horizontal direction will be described, and the positive direction along the Z-axis will be described below and the negative direction will be described as the vertical direction.

As shown in FIG. 1, the hand-drying device 1 has a capacitance-type hand detection sensor 20 as a hand detection unit for detecting whether or not a user's hand has been inserted into the hand insertion unit 11. Then, based on the output of the hand detection sensor 20, the control unit 30 that performs the air blowing control including the on / off of the air blowing unit 40 and the drying air for drying the user's wet hand inserted into the hand insertion unit 11. It has the ventilation part 40 containing the ventilation motor 41 for producing | generating. The hand dryer 1 further includes a heater 50 controlled by the control unit 30 and an operation unit 60 for outputting an operation signal to the control unit 30, and is connected to a power source 70 via a power circuit 80. Thus, power is supplied by the power supplied to the control unit 30. In FIG. 1, 10 indicates a hand dryer housing. When the hand detection sensor 20 detects that the user's hand is in the hand insertion unit 11, the hand drying device 1 is blown from the air outlet 12 according to a control signal from the control unit 30, Operates to blow away moisture adhering to the hand.

The power supply circuit 80 generates a control power supply for operating the circuit from the power supply 70 input as a commercial power supply, and outputs the control power supply to the control unit 30. The power source input to the power supply circuit 80 may be a DC power source instead of an AC power source. For example, DC power may be input to the power supply circuit 80 from a solar power generation system or a storage battery instead of commercial power. When DC power is input to the power supply circuit 80, the power supply circuit 80 may be configured to generate a control power by stepping down or boosting the input DC power. The hand detection sensor 20 outputs a detection signal to the control unit 30 when a human hand is inserted into the hand insertion unit 11. When the detection signal is input from the hand detection sensor 20, the control unit 30 determines that the user's hand has been inserted into the hand insertion unit 11, operates the air blowing motor 41 of the air blowing unit 40, and blows air to the air blowing port 12. send.

The control unit 30 changes the operation mode of the hand dryer 1 according to the operation on the operation unit 60. The operation unit 60 is provided in the main body display unit 14M provided in the upper part of FIG. Further, a drain display portion 14D is provided at the lower portion. It should be noted that the installation position of the operation unit 60 is not necessarily limited to the main body display unit 14M, and may be arranged in another place. Here, the operation mode is air volume adjustment or heater 50 on / off. That is, the control unit 30 includes a calculation unit 32 including a storage unit 31 and a CPU, and sets the amount of wind sent to the blower opening 12 by a fan driven by the blower motor 41 according to an operation on the operation unit 60. At the same time, the heater 50 is turned on and off. When the heater 50 is set to ON, the air sent from the blower 40 to the blower opening 12 is heated by the heater 50 by the fan driven by the blower motor 41 and blown out from the blower opening 12 as warm air. The storage unit 31 stores the detection signal from the hand detection sensor 20, and the calculation unit 32 calculates or indicates an instruction signal for driving the blower unit 40 and controlling the heater 50 based on the detection signal from the hand detection sensor 20. Is output. Moreover, the ventilation port 12 is distribute | arranged as

ventilation port

12a, 12b in the front side and the back side. Reference numeral 13 denotes a drain container for storing moisture blown from the hand, and 13S denotes an electrode plate for detecting the water level in the drain container.

A capacitance detection proximity sensor, that is, a capacitance-type hand detection sensor 20, measures a change in capacitance caused by a human body or the like, and detects an approach of an object, that is, a detection target. Capacitance detection type hand detection sensors can be roughly divided into two types.

FIG. 5 and FIG. 6 show operation principle diagrams of the hand detection sensor 20 based on the first method. If a positive voltage is applied to the ground as an electrode for detection, a positive charge is generated in the electrode, and an electric field is generated between the electrode and the ground. When an object is present in this electric field, it receives electrostatic induction, and a negative charge appears, which is different from the electrode on the side close to the electrode, and a positive charge appears on the opposite side. If the object is far from the electrode, the electric field is weak and the polarization is small, but the electric field becomes strong and the polarization increases as the electrode is approached. The + charge on the electrode side increases due to the induction of the electric field generated in the object. Therefore, since the charge Q increases from C = Q / V, the capacitance C of the electrode increases. As shown in FIG. 6, the electrode capacitance changes most greatly in the grounded conductor. This is because the charge opposite to the charge attracted to the electrode flows to the ground. This is because the electric field becomes stronger and the increase in charge on the detection electrode becomes larger. The capacitance that is formed with respect to the common ground potential or the common reference potential, that is, the ground capacitance, is detected and measured by an appropriate method. When the detection object 200 approaches the detection electrode 22, the capacitance fluctuates due to the influence of the detection object 200. Therefore, the proximity of the detection object 200 is detected by measuring the change in capacitance.

On the other hand, the hand detection sensor based on the second method measures the capacitance formed between the two first electrodes for detection and the second electrode, that is, the capacitance between the electrodes. When a detection object exists between the two first electrodes and the second electrode, the interelectrode capacitance varies due to the influence of the detection object. This change is measured to detect the approach of the detected object.

For example, as shown in FIG. 7, the hand detection sensor 20 constitutes a high-frequency oscillation circuit, and an oscillation circuit 23 that oscillates according to a change in capacitance of the detection electrode 22 due to the approach of the detection target 200, Some include an oscillation state detection circuit 24 that detects an oscillation state and an output circuit 25 that outputs the output of the oscillation state detection circuit 24 at a voltage level or the like. The closer the detection object 200 is to the detection electrode 22, the greater the capacitance of the detection electrode 22, and the oscillation circuit 23 oscillates at a higher frequency. The oscillation state detection circuit 24 counts the number of oscillations per fixed time, and the output circuit 25 outputs a voltage corresponding to the count number. There are other methods such as comparison with a capacitor having a fixed capacity, but any means can be used as long as the capacitance of the detection electrode 22 can be detected.

The hand insertion portion 11 has a U-shaped cross section, and a front flange 10FF on the front side and a rear flange 10RF on the back side face each other. The front flange 10FF and the rear flange 10RF are connected by an inner wall on the bottom surface side at the lowermost part. As described above, the hand insertion portion 11 has a bottomed cross-sectional U shape with an open top in a side view. Furthermore, as shown in FIG. 2, the both side surfaces in the width direction of the hand insertion part 11 are open | released. 10S shows a side wall. 10F shows a front wall, 10R shows a back wall.

Thus, the lower portion of the manual insertion portion 11 is a space surrounded by the front flange 10FF, the rear flange 10RF, and the bottom wall. Further, the upper portion of the hand insertion portion 11 is a space in which the front flange 10FF and the rear flange 10RF face each other and both side surfaces are open, and the user's hand is inserted into the hand insertion portion 11 from the outside of the housing 10. Is possible.

In the manual insertion portion 11, a nozzle that ejects air is provided in the vicinity of the upper opening of the front flange 10FF, and a nozzle that ejects air is provided in the vicinity of the upper opening of the rear flange 10RF. Yes. About the nozzle, the nozzle provided in front flange 10FF and back flange 10RF is opposingly arranged.

The hand detection sensor 20 includes a detection electrode 22 that extends from the control unit 30 to the hand insertion unit 11 along the inner wall of the housing 10 in the vicinity of the air outlet 12 as shown in FIGS. 3 and 4. In addition to the wiring formed on the sheet metal or the substrate, the detection electrode 22 may be a conductive wire covered with an insulating film such as an electric wire or an antenna wire. Any material and configuration can be adopted as long as it is a conductor whose capacitance changes in a non-contact manner through the housing 10 by being inserted into the housing 11.

FIG. 8 shows the capacitance C (t) of the detection electrode 22 detected when the user's hand is inserted into the hand insertion unit 11 and maintained for a while, that is, the output of the hand detection sensor 20. It is the graph which plotted the moving average value A (t) calculated continuously. Here, for example, the detected values at 50 points up to that point are added and divided by the number of samples 50 are used as the moving average value A (t) at that point t, and the latest 50 points in time are sequentially added. A method of calculating the moving average value A (t) by adding the detection values is adopted. In FIG. 8, the graph is shown only up to the point where the user's hand is inserted into the hand insertion unit 11 and maintained for a while.

Although the capacitance C (t) and the moving average value A (t) change from moment to moment as shown in FIG. 8, the control unit 30 uses a memory (not shown) to change the moving average value A that changes with time. Store (t). Then, the control unit 30 determines the difference DA between the first moving average value A (t ₁ ) in a certain period before a certain time and the second moving average value A (t ₂ ) in a certain time after that time. (t) is calculated. That is, the difference DA (t) = second moving average value A (t ₂ ) −first moving average value A (t ₁ ). Here, the predetermined period before a certain point in time is a predetermined time such as 0.5 seconds which is 50 times the sampling interval τ = 10 ms. The control unit 30 is turned on when the difference DA (t) is larger than a predetermined constant average difference threshold _DAth and is a positive value, that is, when the moving average value A (t) increases. When it is negative, that is, when the moving average value A (t) decreases, it is determined OFF.

Then, the time from the first moving average value A (t ₁ ) to the second moving average value A (t ₂ ) is measured, and a delay process corresponding to each is performed. For example, three reference speeds were prepared and divided into four areas. A value obtained by dividing the distance from the upper end to the center by the required time was used as a reference speed, and reference speeds corresponding to times T11, T12, and T13 were set, respectively. That is, it is divided into a first region R11 where τ ₁₁ > T11, a second region R12 where T12 <τ ₁₁ <T11, a third region R13 where T13 <τ ₁₁ <T12, and a fourth region R14 where τ ₁₁ <T13. To do. Then, when belonging to the first region R11, that is, when it takes a long time for the hand to reach the center, the hand insertion speed is slow, so the rise time is increased. On the other hand, if it belongs to the fourth region R14, that is, if the time until the hand reaches the center is short, it means that the insertion speed of the hand is fast and the rise time is reduced.

The control unit 30 stores a predetermined reference insertion speed in the storage unit 31, determines whether or not the hand insertion speed is faster than the reference speed, and determines the rise time according to the determination result. can do.

The stop delay time until one stop is also divided into four areas in the same manner, and delay processing corresponding to each is performed.

The control unit 30 stores a predetermined reference extraction speed in the storage unit 31, determines whether or not the hand extraction speed is faster than the reference speed, and determines the stop delay time according to the determination result. Can be determined.

As described above, the speed at which the hand is moved can be detected by the hand detection sensor 20, and the rise time or operation from when the blower motor 41 of the hand dryer 1 is in a stopped state to the operation according to the speed at which the hand is moved. The stop delay time from when it is in a state to when it stops can be automatically adjusted. When the hand insertion speed is fast, the rise time is shortened, and when the hand insertion speed is slow, the rise time is lengthened. The stop delay time can be shortened when the extraction speed is high, and the stop delay time can be lengthened when the extraction speed is low.

According to the above configuration, the start-up rise time and stop time of the fan motor can be automatically adjusted according to the speed of moving the user's hand. When the hand insertion speed is fast, the rise time is shortened, and the hand insertion speed If it is slow, the rise time will be lengthened to make it difficult for water to splash outside the product regardless of the hand insertion speed, and it will stop depending on the speed at which the hand is pulled out. By stopping, the next user can use it immediately and the usability is improved.

Note that the delay time such as the rise time of the air blower drive during manual insertion and the stop delay time during manual extraction may be controlled in multiple stages, or may be analog control that is continuously changed.

Further, although the capacitance type hand detection sensor is configured in the first embodiment, it is only necessary to be able to detect the insertion speed of the hand and the extraction speed when the hand is pulled out, and is not limited to the capacitance type.

Embodiment 2. FIG.
Next, the hand detection apparatus according to the second embodiment will be described. As shown in FIGS. 9 and 10, the hand detection sensor 20 of the second embodiment includes a pair of hands extending from the control unit 30 to the hand insertion unit 11 along the inner wall of the housing 10 through the periphery of the air blowing port 12. It has the 1st electrode 22a and the 2nd electrode 22b. When the hand dryer 1 is activated, the user tends to move the hand to the vicinity of the air outlet 12 from which the drying air is blown in anticipation of early drying, thereby making it easier to detect the user's hand. Therefore, the first electrode 22 a and the second electrode 22 b are preferably formed so as to surround the air outlet 12 in the manual insertion portion 11. As in the first embodiment, the first electrode 22a and the second electrode 22b can adopt any material and configuration as long as they are conductors whose capacitance changes in a non-contact manner via the housing 10. In FIG. 10, the first electrode 22a and the second electrode 22b overlap each other and cannot be seen. FIG. 9 is a view corresponding to the view seen from the AA direction of FIG.

Next, the output and output process of the hand detection sensor 20 will be described with reference to FIGS. 11 and 12. The hand dryer 1 permits the drive of the blower motor 41 only when the control unit 30 determines from the output of the hand detection sensor 20 that both hands of the user have been inserted into the hand insertion unit 11. Is. The hand drying device 1 includes a hand detection sensor 20 having a first electrode 22a located on the left side and a second electrode 22b located on the right side arranged on the left and right with respect to the user. The first electrode 22 a and the second electrode 22 b are connected to the control unit 30 and extend from the periphery of the air blowing port 12 to the bottom of the hand insertion unit 11 along the inner wall of the housing 10. 11 shows the position of the user's hand when the position of one hand of the user in FIG. 2 is gradually shifted from the left end E _L to the right end _Er of the hand insertion portion 11, and the hand detection sensor. 20 is a plot of the capacitance of the first electrode 22a detected by 20 and the capacitance of the second electrode 22b. The thick solid line C ₁ is the capacitance of the first electrode 22 a detected by the hand detection sensor 20, and the thin solid line C ₂ is the capacitance of the second electrode 22 b detected by the hand detection sensor 20. The unit of capacitance is the relative value of the output of the hand detection sensor 20, and the position of the hand corresponds to the distance from the left end E _L of the hand insertion part 11. In both FIG. 11 and FIG. 12, the vertical axis indicates the capacitance, and the horizontal axis indicates the position of the hand.

However, the hand dryer 1 used to obtain the graph of FIG. 11 differs in the length from the control unit 30 of the first electrode 22a located on the left side and the second electrode 22b located on the right side, and the first electrode 22a. Further, there is a deviation in the sensitivity of the capacitance detected by the second electrode 22b. Therefore, as each peak value is equal, are plotted multiplied by the sensitivity factor k can be set for the electrostatic capacitance C ₂ of the second electrode 22b positioned on the right side. The control unit 30 is arranged in the center as much as possible, and the first electrode 22a located on the left side and the second electrode 22b located on the right side have dimensions such as length and diameter, and electrical characteristics such as capacitance and resistance value. Are designed and manufactured so that the sensitivity coefficient k is approximately equal to 1.

As apparent from FIG. 11, the user when shifted gradually position to the right from the left end E _L of the hand insertion portion 11 of the hand, the capacitance C ₁ of the first electrode 22a on the left side is increased It peaked that maximum value each delay capacitance C ₂ of the second electrode 22b positioned on the right is reached peak or maximum value in increasing thereto. The output values of the capacitances C ₁ and C ₂ of the first electrode 22a located on the left side and the second electrode 22b located on the right side differ depending on the position of the user's hand, which is a dielectric. That is, the position of the user's hand can be estimated from the capacitances C ₁ and C _{2 of} the first electrode 22a and the second electrode 22b. When inserted in the central position, the capacitances C ₁ and C _{2 of} the first electrode 22a located on the left side and the second electrode 22b located on the right side simultaneously reach a peak. That is, the hand detection sensor 20 continuously detects the capacitances C ₁ and C ₂ of the first electrode 22a located on the left side and the second electrode 22b located on the right side, and the control unit 30 detects the _first capacitance located on the left side. A sum signal CA obtained by adding the capacitance C ₂ of the second electrode 22b located on the right side obtained by multiplying the capacitance C ₁ of the one electrode 22a by a predetermined sensitivity coefficient k is calculated. when the signal CA is a sum signal threshold CA _th is greater than a predetermined reference value, and at least one of left and right hands of the user approaches the second electrode 22b located in the first electrode 22a or the right side on the left side It is configured to detect.

Further, the control unit 30, in addition to the above, the electrostatic capacitance C ₁ of the first electrode 22a on the left side, the capacitance of the second electrode 22b positioned on the right multiplied by the sensitivity factor k which is predetermined C _The difference signal CD obtained by subtracting ₂ and taking the absolute value is calculated. When the difference signal CD is smaller than a difference signal threshold value CD _th which is a predetermined reference value, it is detected that both hands of the user approach the first electrode 22a located on the left side and the second electrode 22b located on the right side, Control is performed to drive the blower motor 41.

FIG. 12 plots the sum signal and the difference signal when the position of one hand of the user is gradually shifted from the left end E _L to the right end _Er of the hand insertion portion 11 shown in FIG. Is. The sum signal is indicated by a thick solid line CA, and the difference signal is indicated by a thin solid line CD. As is clear from FIG. 12, when both hands of the user are inserted at the center position, which is an appropriate position of the hand insertion portion 11, the sum signal CA has a maximum value, and the difference signal CD has a minimum value. Have

From the time t ₀ when one hand is detected, the state in which both hands are present at the center position, which is the appropriate position of the hand insertion portion 11, that is, as shown in FIG. 12, the sum signal CA has a maximum value. In addition, the time τ ₀₁ = t ₁ −t ₀ until the time point t ₁ having the minimum value is calculated for the difference signal CD, and the sensitivity coefficient k is set in four stages according to the length of the time τ ₀₁ .

If, as shown in FIG. 13, it contains the hand detection region of the hand sensor 20, the time t ₀ which increased slightly capacitance sum CA, sum signal CA has a maximum value, and the difference signal CD Plots the time τ ₀₁ until the time point t ₁ having the minimum value, and divided into four regions according to the magnitude of the time τ ₀₁ until both hands reach the center position of the hand insertion portion 11. In other words, the time τ ₀₁ until both hands reach the center position of the hand insertion portion 11 is the first region R1 in which τ ₀₁ > T1, the second region R2 in which T2 <τ ₀₁ <T1, T3 <τ ₀₁ < It divides | segments into 3rd area | region R3 which is T2, and 4th area | region R4 which is (tau) ₀₁ <T3. Then, when belonging to the first region R1, that is, when the time until the hand reaches the center is long, since the insertion speed of the hand is slow, the rising time is increased. On the other hand, if it belongs to the fourth region R4, that is, if the time until the hand reaches the center is short, it means that the insertion speed of the hand is fast and the rise time is reduced.

On the other hand, the delay time until the stop is similarly divided into four areas, and a delay time corresponding to each is allocated, and the delay processing is performed based on the delay time.

As shown in FIG. 14, when both hands are at the center position of the hand insertion portion 11, the sum signal CA1 has a maximum value. When the hand is removed from the end of the detection area of the hand detection sensor 20, the sum signal CA1 becomes substantially zero. The time τ ₁₁ from the time point t _1R at which the capacitance sum CA1 takes the maximum value to the time point t _0R at which the capacitance sum CA1 becomes almost zero is plotted, and divided into four regions according to the magnitude of the time τ ₁₁ . . That is, the first region R1R in which the time τ ₁₁ from the time when both hands reach the center position of the hand insertion portion 11 to the time when the hand detection portion detects the hand, that is, the extraction is τ ₁₁ > T1R, T2R <τ ₁₁ < The region is divided into a second region R2R that is T1R, a third region R3R that is T3R <τ ₁₁ <T2R, and a fourth region R4R that is τ ₁₁ <T3R. Then, when belonging to the first region R1R, that is, when the time from when the hand is present in the center to when it reaches the end is long, the hand pull-out speed is slow, so the stop delay time is increased. On the other hand, when belonging to the fourth region R4R, that is, when the time from when the hand is present from the center to when it reaches the end portion is short, it means that the hand extraction speed is fast, and the stop delay time is reduced.

Also in the second embodiment, the same processing as in the first embodiment can be performed, and a hand drying device capable of automatically adjusting the operation start-up time and the stop delay time can be obtained.

In the second embodiment, the amount of fluctuation per unit time is detected as if two detection electrodes are one electrode, but the movement of the hand is caused by the time difference between the capacitance peaks detected by the two hand detection sensors. The speed can also be calculated.

Embodiment 3 FIG.
FIG. 15 is a cross-sectional view seen from a vertical cross section extending in parallel with the front-rear direction with respect to the hand dryer 2 according to the third embodiment. FIG. 15 is a diagram showing a cross-section corresponding to FIG. 4 of the first embodiment. As shown in FIG. 15, the hand drying device 2 according to Embodiment 3 is a hand detection unit configured by a pair of

light emitting elements

28 a and 28 b that emit infrared light and

light receiving elements

29 a and 29 b that detect infrared light. A hand detection sensor 20 is used. The

light emitting elements

28a and 28b and the

light receiving elements

29a and 29b face each other so as to sandwich the hand insertion portion 11, and are provided on the front insertion wall 11 and the back wall of the hand insertion portion 11, respectively. The optical hand detection sensor 20 that detects the hand when the infrared light from the

light emitting elements

28a and 28b is blocked by the hand inserted in the light and cannot be received by the

light receiving elements

29a and 29b is inserted into the opening side of the hand insertion portion 11 and the hand. The speed of the hand may be obtained from the time lag of each hand detection. That is, it is possible to obtain the hand insertion speed and the extraction speed from the output time difference.

The control unit 30 includes a calculation unit that calculates the moving speed of the hand based on the ratio between the light emission amount from the

light emitting elements

28a and 28b and the light reception light amount of the

light receiving elements

29a and 29b, and the light amount ratio calculated by the calculation unit. Based on the above, the hand insertion / removal speed is calculated to determine the rise time and stop delay time. For the arithmetic processing, the same processing as in the first and second embodiments may be used, or other processing may be used.

According to the present embodiment, the driving rise time or stop delay time can be automatically adjusted according to the speed of moving the user's hand. When the hand insertion speed is fast, the rise time is short and the hand insertion speed is slow. In this case, the rise time is long, the stop delay time is shortened when the hand is pulled out quickly, and the stop delay time is lengthened when the hand is pulled out slowly, regardless of the hand insertion speed or the drawing speed. Water is less likely to scatter, and the next user can use it immediately, improving usability.

In the embodiment, a hand insertion portion 11 that is a concave space into which a hand can be inserted is provided at the top of the housing 10 as a drying processing space that is a space for performing hand drying processing, and the hand is inserted from the lateral direction. However, the configuration of the hand dryer of the present invention is not limited to this. For example, a nozzle that blows air downward toward the external space of the housing is disposed on the bottom surface of the box-shaped housing, the space on the bottom surface of the housing is used as the drying processing space, and the nozzle is placed in the hand disposed in the drying processing space. You may comprise the hand-drying apparatus which applies the airflow from and drys.

In the embodiment, the hand detection sensor is continuously driven. However, the hand detection sensor may be intermittently driven. Alternatively, a human sensor may be separately provided and continuously driven only when a person approaches. Good. In the present specification, the time from the determination of absence of hand, such as the driving rise time and stop delay time, to actual driving or stopping is referred to as delay time.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope of the invention, and also included in the invention described in the claims and the equivalents thereof.

1, 2 hand dryer, 10 housing, 10F front wall, 10R rear wall, 10FF front flange, 10RF rear flange, 10S side wall, 11 hand insertion part, 12, 12a, 12b air outlet, 12N nozzle, 13 drain container, 13S electrode plate, 14M main body display unit, 14D drain display unit, 15 room thermo, 17 air inlet, 18 air filter, 19 air path, 20 hand detection sensor, 22 detection electrode, 22a first electrode, 22b second electrode, 23 oscillation circuit, 24 oscillation state detection circuit, 25 output circuit, 30 control unit, 31 storage unit, 32 calculation unit, 40 blower unit, 41 blower motor, 42 frame, 43 inlet, 44 delivery port, 50 heater, 60 operation unit , 70 power supply, 80 power supply circuit, E _L left end, _Er right end.

Claims

A hand insertion part provided in a casing forming an outer shell, a nozzle provided in the hand insertion part for ejecting an air flow, a hand detection part for continuously detecting a hand inserted in the hand insertion part, A blowing unit that is housed in the housing and generates an air flow that ejects an air flow from the nozzle, and a control unit that controls the operation of the blowing unit according to a detection result of the hand detection unit,
The control unit calculates a speed of a hand inserted into and removed from the hand insertion unit based on a detection signal from the hand detection unit, and activates the blower unit from insertion / extraction to the hand insertion unit based on the calculated speed. Or the delay time until it stops is adjusted, The hand dryer characterized by the above-mentioned.
The control unit calculates an insertion speed of a hand inserted into the hand insertion unit based on a detection result of the hand detection unit, and the air flow is detected after the hand detection unit detects a hand based on the calculated insertion speed. The hand-drying device according to claim 1, wherein a rising time until the unit is activated is adjusted.
The control unit stores a predetermined reference insertion speed, determines whether the hand insertion speed is faster than the reference speed, and determines the rise time according to the determination result. The hand dryer according to claim 2.
The control unit calculates the extraction speed of the hand that is pulled out from the hand insertion unit based on the detection result of the hand detection unit, and based on the calculated extraction speed, the hand detection unit until the hand blowing unit stops from the end of detection of the hand The hand dryer according to claim 1, wherein the stop delay time is adjusted.
The control unit stores a predetermined reference extraction speed, determines whether or not the hand extraction speed is faster than the reference speed, and determines a stop delay time stepwise according to the determination result. The hand dryer according to claim 4, wherein the hand dryer is determined as follows.
The hand detection unit includes an electrode disposed in the hand insertion unit, the control unit detects a capacitance of the electrode, and a calculation that calculates a moving speed of the hand from the change in capacitance. The hand-drying apparatus according to claim 1, wherein the hand-drying apparatus is provided.
The hand detection unit includes a first hand detection unit disposed on the entrance side of the hand insertion unit, and a second hand detection unit disposed on the back side of the hand insertion unit with respect to the first hand detection unit. The control unit includes a calculation unit that calculates a moving speed of a hand based on a difference in output time between the first hand detection unit and the second hand detection unit. The hand dryer according to any one of claims 1 to 5.
The first hand detection unit and the second hand detection unit are configured by electrodes, and the control unit detects capacitances of the electrodes of the first hand detection unit and the second hand detection unit. The apparatus includes: a detection unit; and a calculation unit that calculates a moving speed of a hand based on a time difference between capacitances detected by the first hand detection unit and the second hand detection unit. 8. The hand drying apparatus according to 7.
The hand detection unit includes a light emitting element and a light receiving element arranged in the manual insertion unit, and the control unit is configured to perform a manual operation based on a ratio between a light emission amount from the light emitting element and a light reception light amount of the light receiving element. The hand-drying apparatus according to claim 1, further comprising: a calculation unit that calculates a moving speed of the hand dryer.