JP6758239B2 - Warm air dryer - Google Patents

Description

The present invention relates to a hot air dryer including a blower fan and a heater.

A hair dryer (warm air dryer) including this type of blower fan and heater is known in Patent Document 1, for example. There, a phase control circuit is provided between both terminals of the changeover switch, and the junction point between the variable resistor of the phase control circuit and the capacitor is connected to the common terminal via a resistor for changing the conduction angle of the triac. The blower fan motor and heater are connected in parallel to the phase control circuit. When the previous changeover switch is switched to one side and the phase control circuit is connected to the parallel circuit of the motor and heater, the drive rotation of the motor is performed by operating the variable resistor while warm air of a constant temperature is being supplied. You can adjust the number to change the volume of warm air steplessly between light and strong winds. Also, when the previous changeover switch is switched to the other and the phase control circuit is connected to the heater side, the amount of heat generated by the heater can be reduced from zero by operating the variable resistor while the amount of air supplied by the blower fan is constant. The warm air temperature can be adjusted steplessly up to the maximum value.

Jikken Sho 56-2883 (page 1, right column, lines 18 to 35, Fig. 1)

According to the hair dryer of Patent Document 1, by switching the changeover switch, the air volume of the hot air can be changed steplessly in the state where the hot air of a constant temperature is being supplied, or the air volume of the hot air is supplied. The calorific value of the heater can be changed steplessly while the heater is in operation.

An object of the present invention is to provide a warm air dryer capable of discriminating the current operation mode by simply glancing at the display unit.

In the hot air dryer according to the present invention, the main body case 1 is provided with a blower fan 4, a motor 5 for rotationally driving the fan 4, and a heater 6 for heating the air supplied from the blower fan 4. The operation mode of the hot air dryer includes a hot air mode in which the motor 5 and the heater 6 are driven to supply hot air, and a cold air mode in which only the motor 5 is driven to supply cold air. On the outer surface of the main body case 1, a warm air mode display body 31 to 34 that emits light in the warm air mode and a cold air mode display body 35 that emits light in the cold air mode are provided. The hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged adjacent to each other.

The hot air dryer according to the present invention has a plurality of hot air modes having different hot air temperatures. A plurality of warm air mode indicators 31 to 34 are provided corresponding to each warm air mode. A plurality of hot air mode display bodies 31 to 34 and cold air mode display bodies 35 are arranged in a straight line.

In the hot air dryer according to the present invention, the mode changeover switch 9 is arranged on the outer surface of the main body case 1 in which the hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged.

In the hot air dryer according to the present invention, the cold air mode display body 35 is arranged between the hot air mode display bodies 31 to 34 and the mode changeover switch 9, and the hot air mode display bodies 31 to 34 and the cold air mode display body are arranged. 35 and the mode changeover switch 9 are arranged in a straight line.

The hot air dryer according to the present invention is configured to be able to switch a plurality of hot air modes each time the mode changeover switch 9 is turned on.

The hot air dryer according to the present invention is configured to be able to sequentially shift from a hot air mode having a high hot air temperature to a hot air mode having a low hot air temperature each time the mode changeover switch 9 is turned on.

The hot air dryer according to the present invention is configured to switch to the cold air mode when the cold air switch 13 is turned on in a plurality of hot air modes. When the cold air switch 13 is turned on or the mode changeover switch 9 is turned on in the cold air mode, the hot air mode can be switched.

In the hot air dryer according to the present invention, the mode changeover switch 9 and the cold air switch 13 for switching the hot air dryer operated in the hot air mode to the cold air mode are separated from each other in the case structure including the main body case 1 and the handle 3. It is placed in the same position.

In the hot air dryer according to the present invention, the hot air mode display bodies 31 to 34, the cold air mode display body 35, and the mode changeover switch 9 are arranged in the main body case 1, and the cold air switch 13 is arranged in the handle 3. ..

The blower fan 4 in the main body case 1, the motor 5 that rotationally drives the fan 4, the heater 6 that heats the air supplied from the blower fan 4, and the control unit 29 that controls the operating states of the motor 5 and the heater 6. Is provided. The control unit 29 drives the motor 5 and the heater 6 by receiving a detection signal of the temperature sensor 25 that detects the temperature of the hot air heated by the heater 6 and an adjustment signal of the controller 12 that adjusts the heat output of the heater 6. Control the state. Specifically, the control unit 29 can adjust the heat output of the heater 6 according to the adjustment signal output from the controller 12 in the operating state in which the motor 5 and the heater 6 are driven to increase or decrease the warm air temperature. In a state where the heat output of the heater 6 changes, the control unit 29 automatically increases or decreases the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25 to keep the warm air temperature constant. There is.

Depending on the difference in the adjustment speed of the controller 12 by the user, there are slow adjustment in which the adjustment speed of the adjustment signal is lower than the predetermined value and rapid adjustment in which the adjustment speed of the adjustment signal exceeds the predetermined value. When the adjustment state of the controller 12 is slow speed adjustment, the control unit 29 performs normal control for adjusting the drive rotation speed of the motor 5 to a large or small level based on the detection signal of the temperature sensor 25 to keep the warm air temperature constant. It is configured to hold in. Further, when the adjustment state of the controller 12 is a rapid adjustment, the control unit 29 departs from the normal control and shifts to the preset correction control until a predetermined time elapses to correct the warm air temperature. Then, after a lapse of a predetermined time, the control returns to the normal state and the warm air temperature is kept constant.

When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 decreases, if the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 shifts to the correction control and the motor The drive rotation speed of No. 5 is minimized, and the normal control is restored after the predetermined time T1 has elapsed.

When the adjustment amount of the controller 12 is a rapid decrease adjustment exceeding 50% of the adjustment stroke of the controller 12, the control unit 29 shifts from the normal control to the correction control, minimizes the drive rotation speed of the motor 5, and determines the predetermined value. It is configured to return to normal control after the time T1 has elapsed.

When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 increases, if the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 shifts to the correction control and the motor It is configured so that the drive rotation speed of 5 is maximized and the normal control is restored after the predetermined time T2 has elapsed.

When the adjustment amount of the controller 12 is a rapid increase adjustment exceeding 50% of the adjustment stroke of the controller 12, the control unit 29 shifts to the correction control and returns to the normal control after the predetermined time T2 has elapsed. It is configured in.

When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 decreases, if the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 shifts to the correction control and the motor It is configured to minimize the drive rotation speed of 5 and return to the normal control after a predetermined time T1 has elapsed. Further, when the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 increases, if the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 shifts to the correction control. The drive rotation speed of the motor 5 is maximized so that the normal control is restored after the predetermined time T2 has elapsed.

The drive time T1 of the motor 5 when the adjustment state of the controller 12 is the rapid decrease adjustment and the drive time T2 of the motor 5 when the adjustment state of the controller 12 is the rapid increase adjustment satisfy the inequality (T1 <T2). It is set to do.

When the controller 12 is rapidly increased and adjusted within a predetermined time T1 after the controller 12 is rapidly decreased, the control unit 29 is configured to control the drive rotation speed of the motor 5 based on the normal control.

After the controller 12 is rapidly increased and adjusted, when the controller 12 is rapidly decreased and adjusted within T2 for a certain period of time, the control unit 29 is configured to control the drive rotation speed of the motor 5 based on the normal control.

A plurality of temperature sensors 25 are provided in the main body case 1. The control unit 29 controls the driving state of the blower fan 4 and the heater 6 based on the detection signal of the temperature sensor 25 that has detected the highest temperature among the plurality of temperature sensors 25.

The operation mode of the hot air dryer includes a hot air mode in which the motor 5 and the heater 6 are driven to supply hot air, and a cold air mode in which only the motor 5 is driven to supply cold air. In a state where the operation mode is switched from the cold air mode to the warm air mode, the control unit 29 shifts to the correction control, maximizes the heat output of the heater 6, drives the heater 6 for a predetermined time, and then shifts to the normal control. The heat output of the heater 6 is adjusted based on the detection signal of the temperature sensor 25.

The drive time T1 of the heater 6 at the time of rapid decrease adjustment, the drive time T2 of the heater 6 at the time of rapid increase adjustment, and the drive time T3 of the heater 6 at the time of correction control so as to satisfy the inequality (T1> T3> T2). Set.

As shown in FIG. 3, a warm air mode display body 31 to 34 that emits light in the warm air mode and a cold air mode display body 35 that emits light in the cold air mode are provided on the outer surface of the main body case 1. The hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged adjacent to each other.

The warm air mode is composed of a plurality of warm air modes, and a plurality of warm air mode indicators 31 to 34 are provided corresponding to each warm air mode. A mode changeover switch 9 is arranged adjacent to the warm air mode display bodies 31 to 34.

The cold air mode display body 35 is arranged between the hot air mode display bodies 31 to 34 and the mode changeover switch 9.

The hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged in a straight line.

The mode changeover switch 9 and the cold air switch 13 for switching the hot air dryer operated in the hot air mode to the cold air mode are arranged at separate positions in the case structure including the main body case 1 and the handle 3.

As shown in FIG. 2, the warm air mode display bodies 31 to 34, the cold air mode display body 35, and the mode changeover switch 9 are arranged in the main body case 1, and the cold air switch 13 is arranged on the handle 3.

The heater 6 is composed of a plate-shaped heater substrate 22 having an insulating property and a heater wire 23 spirally wound around the heater substrate 22. The temperature sensor 25 includes a radial lead type thermistor including a detection unit 25a and a pair of lead units 25b. As shown in FIG. 4, the temperature sensor 25 is fixed to the terminal 26 of the heater substrate 22 with the pair of lead portions 25b located on the front surface and the back surface of the heater substrate 22.

A plurality of heater substrates 22 are crossed, and a heater wire 23 is spirally wound around each substrate 22. The lead portion 25b of the temperature sensor 25 is fixed to the terminal 26 provided at the intersecting base portion of the heater substrate 22, and the detection portion 25a is arranged so as to face the heater wire 23 on the leeward side.

As shown in FIG. 8, the controller 12 includes a slide-type variable resistor 39 and a slide knob 40 that is attached to the handle 3 and reciprocates the operation unit 39a of the variable resistor 39. The handle 3 is provided with a guide portion 41 that slides and guides the slide knob 40, and a resistance wall 42 that imparts frictional resistance to the slide knob 40. The slide knob 40 includes a knob body 43 that is slid-guided by a guide portion 41, and an elastic slide arm 45 that slides into contact with the resistance wall 42. A frictional resistance between the elastic slide arm 45 and the resistance wall 42 is applied to the slide knob 40 that is reciprocated to give the slide knob 40 an operating resistance.

Friction-increasing portions 48 that increase the amount of elastic deformation of the elastic slide arm 45 are provided on the resistance walls 42 facing both ends of the reciprocating stroke of the elastic slide arm 45.

In the hot air dryer of the present invention, the hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged adjacent to each other, so that the current operation mode can be determined simply by glancing at the display unit.

In the hot air dryer of the present invention, since a plurality of hot air mode display bodies 31 to 34 and cold air mode display bodies 35 are arranged in a straight line, when the light emitting state of each display body 31 to 35 is directly viewed. Of course, even when indirectly visually recognizing the light emitting state of each display body 31 to 35 reflected in the mirror, the current operation mode can be clearly discriminated, and there is no room for misunderstanding.

In the hot air dryer of the present invention, since the mode changeover switch 9 is arranged on the outer surface of the main body case 1 in which the hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged, the display unit can be visually recognized. The mode changeover switch 9 can be operated while doing so.

In the hot air dryer of the present invention, the hot air mode display bodies 31 to 34, the cold air mode display body 35, and the mode changeover switch 9 are arranged in a straight line, so that the mode changeover switch 9 can be operated while visually recognizing the display unit. Can be operated.

Since the hot air dryer of the present invention is configured to be able to switch a plurality of hot air modes each time the mode changeover switch 9 is turned on, the hot air mode is switched each time the mode changeover switch 9 is turned on. Can be done.

The hot air dryer of the present invention is configured to be able to shift from the hot air mode having a high hot air temperature to the hot air mode having a low hot air temperature in order each time the mode changeover switch 9 is turned on. Each time the switch 9 is turned on, the mode can be sequentially changed from the hot air mode having a high hot air temperature to the hot air mode having a low hot air temperature.

The hot air dryer of the present invention can be switched to the hot air mode by turning on the cold air switch 13 or turning on the mode changeover switch 9 in the cold air mode. Therefore, the cold air switch 13 or the mode changeover switch 9 can be switched to the hot air mode. You can return to the warm air mode by operating either switch.

In the hot air dryer of the present invention, the mode changeover switch 9 and the cold air switch 13 for switching the hot air dryer operated in the hot air mode to the cold air mode are separated from each other in the case structure including the main body case 1 and the handle 3. Since it is placed at the position, it is possible to avoid a mistake in switching the operation mode due to a user's operation error or misunderstanding.

In the hot air dryer of the present invention, the hot air mode display bodies 31 to 34, the cold air mode display body 35, and the mode changeover switch 9 are arranged in the main body case 1, and the cold air switch 13 is arranged in the handle 3. With the handle 3 clasped with one hand, the mode changeover switch 9 can be operated with the free hand to switch the operation mode. Further, in a state where the handle 3 is gripped with one hand, the gripping position can be changed, or the cold air switch 13 can be operated with the thumb while the handle 3 is gripped to switch to the cold air mode or to switch from the cold air mode to the warm air mode. .. Therefore, when operating the mode changeover switch 9 or the cold air switch 13, there is no room for making a mistake in the switch to be operated, and the operation mode can be changed more reliably.

In the hot air dryer, the control unit 29 receives the output signal of the temperature sensor 25 and the adjustment signal of the controller 12 to control the driving state of the motor 5 and the heater 6. Specifically, in the operating state in which the motor 5 and the heater 6 are driven, the control unit 29 adjusts the drive rotation speed of the motor 5 according to the adjustment signal output from the controller 12 to adjust the amount of air blown by the blower fan 4. Enabled to increase / decrease adjustment. Then, the control unit 29 automatically increases or decreases the heat output of the heater 6 based on the detection signal of the temperature sensor 25 in a state where the amount of air blown by the blower fan 4 increases or decreases. It was configured so that the warm air temperature could be kept constant regardless.

According to the warm air dryer provided with the control unit 29 as described above, the warm air temperature of the warm air dryer is automatically adjusted regardless of the environmental temperature, and the air volume suitable for a plurality of hair treatment states is adjusted. And can supply warm air of temperature. Further, even when the user operates the controller 12 to adjust the air supply amount of the blower fan 4 to a desired air volume, the control unit 29 keeps the temperature regardless of the change in the air supply amount of the blower fan 4. The heat output of the heater 6 can be automatically increased or decreased based on the detection signal of the sensor 25 to keep the warm air temperature constant.

When the adjustment state of the controller 12 is slow speed adjustment, the control unit 29 performs normal control for increasing or decreasing the heat output of the heater 6 based on the detection signal of the temperature sensor 25, and keeps the warm air temperature constant. To do. In this way, when the controller 12 is adjusted at a slow speed, the normal control is performed because the change width of the drive rotation speed of the motor 5 due to the slow speed adjustment is small, so that the adjustment operation of the motor 5 is surely followed. This is because the heat output of the heater 6 can be accurately controlled by normal control. Further, if the correction control is performed when the adjustment state of the controller 12 is a rapid adjustment, the heat output of the heater 6 is appropriately controlled in a state commensurate with the adjustment operation of the motor 5, and is supplied from the warm air dryer. This is because the temperature of the warm air can be brought close to the target temperature and the temperature of the warm air can be kept constant. If normal control is continued when the controller 12 is rapidly adjusted, the heat output of the heater 6 cannot be quickly controlled following the adjustment operation of the controller 12, and the temperature supplied from the warm air dryer cannot be controlled quickly. The temperature of the wind deviates greatly from the target temperature.

When the adjustment state of the controller 12 is a rapid decrease adjustment, when the control unit 29 shifts to the correction control, minimizes the heat output of the heater 6 and drives it for a predetermined time T1, the drive rotation speed of the motor 5 suddenly increases. The heat output of the heater 6 can be reduced in response to the decrease. This makes it possible to prevent the heater 6 from falling into an overshoot. Further, after the correction control is started and T1 elapses for a predetermined time, the normal control is restored and the temperature of the hot air supplied from the hot air dryer is kept constant. When the heat output of the heater 6 is minimized, the drive current supplied to the heater 6 is stopped, or the pulse width of the drive current and the number of pulses per unit time are reduced.

When the adjustment amount of the controller 12 is a rapid decrease adjustment of 50% or more of the adjustment stroke of the controller 12, when the control unit 29 shifts from the normal control to the correction control and minimizes the heat output of the heater 6, the heater It is possible to prevent the heat output of No. 6 from being unnecessarily greatly adjusted. For example, when the adjustment amount of the controller 12 is 30% of the adjustment stroke of the controller 12, if the correction control is performed to minimize the heat output of the heater 6, the control for correction becomes excessive and the control result is Will vary greatly from the target temperature. As a result, it takes time for the temperature of the hot air sent from the hot air dryer to settle to the target temperature. The control unit 29 returns to the normal control after a predetermined time T1 has elapsed from the start of the correction control, and keeps the warm air temperature supplied from the hot air dryer constant.

When the adjustment state of the controller 12 is a rapid increase adjustment, when the control unit 29 shifts to the correction control, maximizes the heat output of the heater 6 and drives it for a predetermined time T2, the drive rotation speed of the motor 5 suddenly increases. The heat output of the heater 6 can be increased in response to the increase. As a result, it is possible to prevent the heater 6 from falling into an undershoot. Further, after the correction control is started and the predetermined time T2 elapses, the control returns to the normal state, and the temperature of the hot air supplied from the hot air dryer is kept constant. When maximizing the heat output of the heater 6, the drive current supplied to the heater 6 is maximized, or the pulse width of the drive current and the number of pulses per unit time are increased.

When the adjustment amount of the controller 12 is a rapid increase adjustment of 50% or more of the adjustment stroke of the controller 12, when the control unit 29 shifts from the normal control to the correction control and maximizes the heat output of the heater 6, the heater It is possible to prevent the heat output of No. 6 from being unnecessarily greatly adjusted. For example, when the adjustment amount of the controller 12 is 20% of the adjustment stroke of the controller 12, if the correction control is performed to maximize the heat output of the heater 6, the control for correction becomes excessive, and the control result Will vary greatly from the target temperature. As a result, it takes time for the temperature of the hot air sent from the hot air dryer to settle to the target temperature. The control unit 29 returns to the normal control after a predetermined time T1 has elapsed from the start of the correction control, and keeps the warm air temperature supplied from the hot air dryer constant.

When the controller 12 is adjusted for rapid decrease, the control unit 29 shifts to correction control to minimize the heat output of the heater 6, and when the controller 12 is adjusted for rapid increase, the control unit 29 shifts to correction control. The heat output of the heater 6 is maximized. According to such a control mode, the heat output of the heater 6 can be optimized in response to all the rapid adjustment operations by the controller 12, and the temperature of the hot air supplied from the hot air dryer can be kept constant.

The drive time T1 of the heater 6 when the controller 12 is adjusted for rapid decrease and the drive time T2 of the heater 6 when the controller 12 is adjusted for rapid increase are set so as to satisfy the inequality (T1> T2). There are the following reasons. The temperature of the heater 6 in the state where the heat output is maximized is further heated from the state where it is already heated and holds a large amount of heat immediately before the maximum output is maximized, and the degree of increase in the amount of heat becomes large. Therefore, the target temperature can be approached in a shorter time, and an overshoot is likely to occur. Therefore, by quickly shifting from correction control to normal control, an overshoot is surely avoided. Therefore, the relationship between the time T1 and the time T2 may be (T1> T2).

The reason why the control unit 29 controls the heat output of the heater 6 based on the normal control when the controller 12 is rapidly increased and adjusted within the predetermined time T1 after the controller 12 is adjusted to decrease rapidly is as follows. In the state where the controller 12 is rapidly lowered and adjusted, the control unit 29 temporarily switches to the correction control to minimize the heat output of the heater 6. However, if the controller 12 is rapidly increased and adjusted before the predetermined time T1 elapses after switching to the correction control, the correction control in the direction of increasing the temperature is performed before the correction control for lowering the temperature of the heater 6 is completed. Will have to be done. In such a case, since the heat output of the heater 6 is maximized, the heater 6 is likely to fall into an overshoot state. In order to prevent such a problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without maximizing the heat output of the heater 6.

The reason why the control unit 29 controls the heat output of the heater 6 based on the normal control when the controller 12 is rapidly decreased and adjusted within the predetermined time T2 after the controller 12 is rapidly increased and adjusted is as follows. In the state where the controller 12 is rapidly increased and adjusted, the control unit 29 temporarily switches to the correction control to maximize the heat output of the heater 6. However, if the controller 12 is rapidly lowered and adjusted before the predetermined time T2 elapses after switching to the correction control, the correction control in the direction in which the temperature drops before the correction control in which the temperature of the heater 6 increases ends. Will have to be done. In such a case, since the heat output of the heater 6 is minimized, the heater 6 is likely to fall into an undershoot state. In order to prevent such a problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without minimizing the heat output of the heater 6.

In another hot air dryer, the control unit 29 receives the output signal of the temperature sensor 25 and the adjustment signal of the controller 12 to control the driving state of the motor 5 and the heater 6. Specifically, the control unit 29 adjusts the heat output of the heater 6 according to the adjustment signal output from the controller 12 in the operating state in which the motor 5 and the heater 6 are driven so that the hot air temperature can be increased or decreased. I made it. Then, when the heat output of the heater 6 increases or decreases, the control unit 29 automatically increases or decreases the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25, and is irrelevant to the change in the heat output of the heater 6. It was configured so that the warm air temperature could be kept constant.

According to the hot air dryer provided with the control unit 29 as described above, the hot air temperature of the hot air dryer can be automatically adjusted regardless of the environmental temperature. Further, even when the user operates the controller 12 to adjust the ventilation temperature to a desired temperature, the control unit 29 automatically increases or decreases the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25. Therefore, the warm air temperature can be kept constant.

When the adjustment state of the controller 12 is slow speed adjustment, the control unit 29 performs normal control for increasing or decreasing the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25 to keep the warm air temperature constant. Hold. In this way, when the controller 12 is slowly adjusted, the normal control is performed because the change width of the heat output of the heater 6 due to the slow speed adjustment is small, and the motor 5 reliably follows the adjustment operation of the heater 6. This is because the drive rotation speed of the above can be accurately controlled by normal control. Further, when the correction control is performed when the adjustment state of the controller 12 is a rapid adjustment, the drive rotation speed of the motor 5 is appropriately controlled in a state corresponding to the adjustment operation of the heater 6, and the air is supplied from the warm air dryer. This is because the temperature of the hot air can be brought close to the target temperature and the temperature of the hot air can be kept constant. If the normal control is continued when the controller 12 is rapidly adjusted, the drive rotation speed of the motor 5 cannot be quickly controlled following the adjustment operation of the controller 12, and the air is supplied from the warm air dryer. The temperature of the warm air deviates greatly from the target temperature.

When the adjustment state of the controller 12 is a rapid decrease adjustment, when the control unit 29 shifts to the correction control, minimizes the drive rotation speed of the motor 5 and drives the motor 5 for a predetermined time T1, the heat output of the heater 6 suddenly increases. The drive rotation speed of the motor 5 can be reduced in response to the decrease. As a result, it is possible to prevent the heater 6 from falling into an undershoot. Further, after the correction control is started and T1 elapses for a predetermined time, the normal control is restored and the temperature of the hot air supplied from the hot air dryer is kept constant. When the drive rotation speed of the motor 5 is minimized, the drive current supplied to the motor 5 is stopped, or the pulse width of the drive current and the number of pulses per unit time are reduced.

When the adjustment amount of the controller 12 is a rapid decrease adjustment of 50% or more of the adjustment stroke of the controller 12, when the control unit 29 shifts from the normal control to the correction control and minimizes the drive rotation speed of the motor 5, the motor It is possible to prevent the drive rotation of 5 from being unnecessarily greatly adjusted. For example, when the adjustment amount of the controller 12 is 30% of the adjustment stroke of the controller 12, if the correction control is performed to minimize the drive rotation of the motor 5, the control for the correction becomes excessive and the control result is Will vary greatly from the target temperature. As a result, it takes time for the temperature of the hot air sent from the hot air dryer to settle to the target temperature. The control unit 29 returns to the normal control after a predetermined time T1 has elapsed from the start of the correction control, and keeps the warm air temperature supplied from the hot air dryer constant.

When the adjustment state of the controller 12 is a rapid increase adjustment, when the control unit 29 shifts to the correction control, maximizes the drive rotation speed of the motor 5 and drives it for a predetermined time T2, the heat output of the heater 6 increases sharply. The drive rotation speed of the motor 5 can be increased accordingly. This makes it possible to prevent the heater 6 from falling into an overshoot. Further, after the correction control is started and the predetermined time T2 elapses, the control returns to the normal state, and the temperature of the hot air supplied from the hot air dryer is kept constant. When maximizing the drive rotation speed of the motor 5, the drive current supplied to the motor 5 is maximized, or the pulse width of the drive current and the number of pulses per unit time are increased.

When the adjustment amount of the controller 12 is a rapid increase adjustment of 50% or more of the adjustment stroke of the controller 12, when the control unit 29 shifts from the normal control to the correction control and maximizes the drive rotation speed of the motor 5, the motor It is possible to prevent the drive rotation speed of 5 from being unnecessarily largely adjusted. For example, when the adjustment amount of the controller 12 per unit time is 20% of the adjustment stroke of the controller 12, if the correction control is performed to maximize the drive rotation speed of the motor 5, the control for the correction becomes excessive. Therefore, the control result greatly varies from the target temperature. As a result, it takes time for the temperature of the hot air sent from the hot air dryer to settle to the target temperature. The control unit 29 returns to the normal control after a predetermined time T2 has elapsed from the start of the correction control, and keeps the hot air temperature supplied from the hot air dryer constant.

When the controller 12 is adjusted for rapid decrease, the control unit 29 shifts to correction control to minimize the drive rotation speed of the motor 5, and when the controller 12 is adjusted for rapid increase, the control unit 29 shifts to correction control. The drive rotation speed of the motor 5 is maximized. According to such a control mode, the drive rotation speed of the motor 5 can be optimized in response to all the rapid adjustment operations by the controller 12, and the temperature of the hot air supplied from the hot air dryer can be kept constant.

The drive time T1 of the motor 5 when the controller 12 is adjusted for rapid decrease and the drive time T2 of the motor 5 when the controller 12 is adjusted for rapid increase are set so as to satisfy the inequality (T1 <T2). There are the following reasons. When the controller 12 is rapidly increased and adjusted, the heat output of the heater 6 is rapidly increased. Therefore, by lengthening the drive time T2 of the motor 5, the temperature of the hot air supplied from the hot air dryer can be brought closer to the target temperature in a shorter time. Therefore, the relationship between the time T1 and the time T2 may be (T1 <T2).

The reason why the control unit 29 controls the drive rotation speed of the motor 5 based on the normal control when the controller 12 is rapidly increased and adjusted within the predetermined time T1 after the controller 12 is adjusted to decrease rapidly is as follows. In the state where the controller 12 is rapidly lowered and adjusted, the control unit 29 temporarily switches to the correction control to minimize the drive rotation speed of the motor 5. However, if the controller 12 is rapidly increased and adjusted before the predetermined time T1 elapses after switching to the correction control, the drive rotation of the motor 5 is completed before the correction control for minimizing the drive rotation speed of the motor 5 is completed. It becomes necessary to perform correction control in the direction in which the number increases. In such a case, since the drive rotation speed of the motor 5 is maximized, the heater 6 is likely to fall into an undershoot state. In order to prevent such a problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without maximizing the drive rotation speed of the motor 5.

The reason why the control unit 29 controls the drive rotation speed of the motor 5 based on the normal control when the controller 12 is rapidly decreased and adjusted within the predetermined time T2 after the controller 12 is rapidly increased and adjusted is as follows. In the state where the controller 12 is rapidly increased and adjusted, the control unit 29 temporarily switches to the correction control to maximize the drive rotation speed of the motor 5. However, if the controller 12 is rapidly lowered and adjusted before the predetermined time T2 elapses after switching to the correction control, the drive rotation speed of the motor 5 increases before the correction control for increasing the drive rotation speed of the motor 5 is completed. It becomes necessary to perform correction control in the direction in which the value decreases. In such a case, since the drive rotation speed of the motor 5 is minimized, the heater 6 is likely to fall into an overshoot state. In order to prevent such a problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without minimizing the drive rotation speed of the motor 5.

The hot air temperature is detected by the plurality of temperature sensors 25 based on the detection signal of the temperature sensor 25 that has detected a higher temperature, and the drive state of the blower fan 4 and the heater 6 is controlled by the control unit 29 to dry the hot air. This is to improve the safety of the aircraft.

When the operation mode is switched from the cold air mode to the warm air mode, the control unit 29 shifts to the correction control, maximizes the heat output of the heater 6, and drives the heater 6 for a predetermined time T3, the temperature of the hot air rises. The time for rapidly returning to the target temperature can be shortened. Further, after the elapse of the predetermined time T3, the normal control can be restored and the temperature of the hot air supplied from the hot air dryer can be kept constant.

The setting that the relationship between the drive times T1, T2, and T3 of the heater 6 satisfies the inequality (T1> T3> T2) is that the heater 6 overshoots when returning from the cold air mode to the warm air mode. This is to speed up the rise of the warm air temperature when returning to the warm air mode while preventing it. When T1 = <T3, the amount of heat generated becomes extra due to the longer heat generation time of the heater 6, and an overshoot is likely to occur. Further, when T3 = <T2, the amount of heat generated by the heater 6 is insufficient due to the short heat generation time, and the time until the warm air temperature when returning to the warm air mode reaches the target temperature is prolonged.

When the hot air mode display bodies 31 to 34 and the cold air mode display bodies 35 are arranged adjacent to each other, the current operation mode can be clearly discriminated by simply glancing at the number of lights of each LED 31 to 35 and the difference in emission color.

When the mode changeover switches 9 are arranged adjacent to the plurality of warm air mode displays 1 to 34, the current operation mode can be clearly discriminated by simply glancing at each of the displays 31 to 34.

When the cold air mode display body 35 is arranged between the hot air mode display bodies 31 to 34 and the mode changeover switch 9, the user can confirm that the cold air mode is in the cold air mode without making a mistake. In particular, when the emission color of the cold air mode display body 35 is significantly different from the emission color of the warm air mode display bodies 31 to 34, it can be confirmed that the cold air mode is definitely in the cold air mode.

When the warm air mode display bodies 31 to 34 and the cold air mode display bodies 35 are arranged in a straight line, not only when the light emitting state of each display body 31 to 35 is directly viewed, but also when each display body 31 to 35 reflected in the mirror Even when the light emission status is indirectly visually recognized, the current operation mode can be clearly discriminated, and there is no room for misunderstanding.

By arranging the mode changeover switch 9 and the cold air switch 13 at separate positions in the case structure, it is possible to avoid an operation mode changeover error due to a user's operation error or misunderstanding.

When the warm air mode display body 31 to 34, the cold air mode display body 35, and the mode changeover switch 9 are arranged in the main body case 1 and the cold air switch 13 is arranged in the handle 3, the handle 3 is vacant in a state of being clasped with one hand. The operation mode can be switched by operating the mode changeover switch 9 with the hand on the side of the user. Further, in a state where the handle 3 is gripped with one hand, the gripping position can be changed, or the cold air switch 13 can be operated with the thumb while the handle 3 is gripped to switch to the cold air mode or to switch from the cold air mode to the warm air mode. .. Therefore, when operating the mode changeover switch 9 or the cold air switch 13, there is no room for making a mistake in the switch to be operated, and the operation mode can be changed more reliably.

When the temperature sensor 25 is composed of a radial lead type thermistor and the temperature sensor 25 is fixed to the terminal 26 of the heater board 22 with the pair of lead portions 25b located on the front surface and the back surface of the heater board 22, the pair of lead portions Since the 25b can be separated by the heater substrate 22, it is possible to reliably prevent the pair of lead portions 25b from coming into contact with each other and causing a short circuit. Further, the pair of lead portions 25b can be firmly supported by the heater substrate 22 to reliably prevent the detection portions 25a from shifting and moving during use.

When the lead portion 25b of the temperature sensor 25 is fixed to the terminal 26 provided at the intersecting base of the heater substrate 22 and the detection portion 25a faces the heater wire 23 on the leeward side, the temperature sensor 25 comes into contact with the heater wire 23 and is heated. It is possible to accurately detect the temperature of the warm air immediately after the operation.

In the controller 12 provided with the slide-type variable resistor 39 and the slide knob 40, when the frictional resistance between the elastic slide arm 45 and the resistance wall 42 is applied to the slide knob 40 to be reciprocated, the slide knob 40 Can be stopped and held at any adjustment position. Further, by imparting an appropriate operation resistance to the slide knob 40, it is possible to prevent the slide knob 40 from being excessively slid and to make the operation feeling at the time of adjustment smooth and crisp.

When a friction increasing portion 48 for increasing the amount of elastic deformation of the elastic slide arm 45 is provided on the resistance walls 42 facing both ends of the reciprocating stroke of the elastic slide arm 45, the elastic slide arm 45 is provided at the upper and lower ends of the reciprocating stroke of the slide knob 40. The amount of elastic deformation of can be increased to increase the operating resistance. Therefore, even when the slide knob 40 is suddenly operated, it is possible to reliably prevent the operating portion 39a of the variable resistor 39 from impactfully colliding with the groove end of the slide groove 49.

It is a flowchart which shows the control procedure of the hair dryer which concerns on this invention. It is explanatory drawing which shows the schematic structure of the hair dryer which concerns on this invention. It is a side view which shows the detail of a display unit. It is the schematic of the cross section of line AA in FIG. It is a block diagram which shows the outline of the electronic circuit of a hair dryer. It is explanatory drawing which shows the operation mode switching procedure of a hair dryer. It is a figure which shows the operation state of an electric component and a display part in each operation mode. It is a vertical sectional front view which shows the detailed structure of a controller. FIG. 8 is a cross-sectional view taken along the line BB in FIG. It is a timing chart about the control change at the time of rapid adjustment. It is a flowchart which shows the correction control procedure at the time of rapid drop adjustment. It is a flowchart which shows the correction control procedure at the time of rapid increase adjustment. It is a timing chart about the control change at the time of rapid adjustment. It is a timing chart about the control change in the cold air mode.

(Example 1) FIGS. 1 to 14 show Example 1 of a hair dryer (warm air dryer) according to the present invention. The front / rear, left / right, and up / down in the present invention follow the crossing arrows shown in FIGS. 2 and 4 and the front / rear, left / right, and up / down indications shown in the vicinity of each arrow. In FIG. 2, the hair dryer includes a main body case 1 made of a hollow cylinder and a handle 3 foldably connected to the main body case 1 about a shaft 2, and the main body case 1 and the handle 3 are the hair dryers. It constitutes the case structure. An axial-flow type blower fan 4 for supplying dry air and a motor 5 for rotationally driving the fan 4 are arranged inside the main body case 1, and a heater 6 is arranged on the downstream side of the blower fan 4. In FIG. 2, reference numeral 52 is a suction port of the main body case 1, and 53 is an outlet. In the hair dryer in the used state, the air sucked from the suction port 52 by the blower fan 4 is pressurized and sent toward the outlet 53, and is heated while passing through the heater 6 to be warmed and blown. It is blown out from the exit 53. When the operation of the heater 6 is stopped, pressurized air at room temperature (cold air) is blown out from the outlet 53.

As shown in FIG. 3, a mode changeover switch 9 for switching the operation mode of the hair dryer and a display unit 10 for lighting and displaying according to each operation mode are provided on the upper part of the right side surface of the main body case 1. As shown in FIG. 2, on the front surface of the handle 3, a main switch 11 for activating the motor 5 and the heater 6 and a controller 12 for adjusting the drive rotation speed of the motor 5 are provided. Further, on the rear surface of the handle 3, a cold air switch 13 for switching the operating state of the hair dryer from the hot air mode to the cold air mode is provided. Above the heater 6, a pair of left and right discharge electrodes 14 for generating ions, a Peltier element 15, a heat sink 16, and the like are provided. In FIG. 2, reference numeral 17 is a transformer, 18 is a power supply-control board, and 19 is a temperature control board. As described above, the mode changeover switch 9 is arranged on the upper part of the right side surface of the main body case 1, the cold air switch 13 is arranged on the back surface of the handle 3, and both switches 9 and 13 are arranged at separate positions in the case structure. This is to avoid mistakes in switching the operation mode due to user's operation mistakes or misunderstandings.

As shown in FIG. 4, the heater 6 is composed of a heater substrate 22 having insulation and assembled in a cross shape, a heater wire 23 spirally wound around the heater substrate 22, and a baffle cylinder 24 formed of an insulating material. Constitute. Two temperature sensors 25 are arranged on the heater substrate 22. The temperature sensor 25 is composed of a radial lead type thermistor including a detection unit 25a and a pair of lead portions 25b, and the terminals 26 of the heater substrate 22 are provided with the pair of lead portions 25b located on the front surface and the back surface of the heater substrate 22. It is fixed to. As shown in the enlarged view of FIG. 4, the detection unit 25a in this state faces the heater wire 23 on the leeward side, whereby the temperature of the warm air immediately after contacting the heater wire 23 and being heated can be accurately measured. Can be detected. Further, since the pair of lead portions 25b can be separated by the heater substrate 22, it is possible to reliably prevent the lead portions 25b from coming into contact with each other and causing a short circuit. Further, the pair of lead portions 25b are firmly supported by the heater substrate 22, and the detection portion 25a can be reliably prevented from shifting during use. When the detection unit 25a is arranged so as to face the inside or the outside of the winding region of the heater wire 23, the temperature of the warm air passing through the detection unit 25 becomes low, so that the temperature control of the warm air is accurate. I can't do it.

Control circuits 5C, 6C, and 15C are individually provided to control the operating states of the motor 5, the heater 6, and the Peltier element 15 (see FIG. 5). Further, in response to the signals output from the mode changeover switch 9, the controller 12, the cold air switch 13, and the temperature sensor 25, an operation command signal is output to each of the control circuits 5C, 6C, and 15C, and the motor 5 (blower fan 4). It includes a control unit 29 made of a microcomputer that controls the driving state of the heater 6 and the Peltier element 15. The discharge electrode 14 is activated or stopped according to the on-off operation of the main switch 11. As described above, two temperature sensors 25 are arranged, and this controls the drive state of the blower fan 4 and the heater 6 based on the detection signal of the temperature sensor 25 that has detected a higher temperature. This is to increase the safety level by controlling with.

When the main switch 11 is turned on, a commercial alternating current is supplied to the power supply-control board 18 to adjust the current for operating the motor 5, the heater 6, the discharge electrode 14, and the like. Further, the control unit 29 switches the drive rotation speed of the motor 5 to large or small according to the adjustment signal of the controller 12. When the main switch 11 is turned on, the heater 6 is in the first mode in which the amount of heat generated is maximum (see FIG. 7), and warm air of 100 ° C. is sent out from the outlet 53. The drive current supplied to the heater 6 is a pulse current, and the pulse width and the number of pulses per unit time are controlled by the control unit 29 to adjust the heat generation amount of the heater 6. Each time the mode changeover switch 9 is turned on in this state, the mode is switched between the second mode (90 degree C), the third mode (80 degree C), and the fourth mode (60 degree C) as shown in FIG. , Warm air with the temperature in parentheses is sent from the outlet. Further, when the cold air switch 13 is turned on in each hot air mode, the heater 6 is switched to the fifth mode (cold air mode), the energization of the heater 6 is cut off, and the dry air at room temperature is sent out from the air outlet. Further, in the fifth mode, the cold air switch 13 can be turned on again or the mode changeover switch 9 can be operated to switch to the warm air mode (first to fourth modes).

A display unit 10 is provided in order to display light emission according to each of the above operation modes. As shown in FIG. 3, the display unit 10 has four LEDs (warm air mode display body) 31.32.33.34 and one LED (cold air mode display body) 35 on a long front and rear LED substrate 30. Are mounted at equal intervals, and the LEDs 31, 32, 33, and 34 are lit according to the operation modes of the first mode to the fourth mode. Specifically, as shown in FIG. 7, in the first mode, the three LEDs 31, 32, 33 emit red light, and in the second mode, the two LEDs 32, 33 emit red light. In the third mode, one LED 33 emits red light. In the fourth mode, each of the above LEDs 31, 32, and 33 stops emitting light, and the LED 34 emits green light. In the state where the cold air switch 13 is turned on and switched to the fifth mode, the LED 35 located at the rear end in FIG. 3 is lit to emit blue light. Therefore, the user can determine the current operation mode from the number of lights of each of the LEDs 31 to 35 and the difference in the emission color. A transparent window plate 36 that covers the outer surface of each of the LEDs 31 to 35 is fixed to the main body case 1.

As described above, the five LEDs 31 to 35 are arranged in a straight line in a state of being adjacent to each other at regular intervals, and the mode changeover switch 9 is arranged on the extension of the arrangement line. In other words, the mode changeover switch 9 is arranged adjacent to the hot air mode display LEDs 31 to 34, and the cold air mode display LED 35 is arranged between the warm air mode display LEDs 31 to 34 and the mode changeover switch 9. are doing.

As described above, when the LEDs 31 to 34 for displaying the hot air mode and the LEDs 35 for displaying the cold air mode are arranged adjacent to each other, the current operation can be performed simply by glancing at the number of lights of each LED 31 to 35 and the difference in emission color. The mode can be clearly identified. Further, since the mode changeover switch 9 is arranged close to the LEDs 31 to 34 for displaying the warm air mode, the mode changeover switch 9 is changed while clearly visually recognizing the lighting state (operation mode) of the LEDs 31 to 34. It is possible to switch the operation mode accurately. Furthermore, since the LED 35 for cold air mode display is arranged between the LEDs 31 to 34 for hot air mode display and the mode changeover switch 9, the user mistakes because the emission color is only blue. It can be confirmed that it is in the cold air mode without any trouble. Since the LEDs 31 to 34 for displaying the hot air mode and the LEDs 35 for displaying the cold air mode are arranged in a straight line, not only when directly looking at the lighting status of each LED 31 to 35, but also each LED 31 to 35 reflected in the mirror. Even when the lighting status of is indirectly visually recognized, the current operation mode can be clearly discriminated, and there is no room for misunderstanding.

As shown in FIGS. 8 and 9, the controller 12 includes a slide-type variable resistor 39 and a slide knob 40 which is attached to the handle 3 and reciprocates the operation portion 39a of the variable resistor 39. A guide portion 41 that slides and guides the slide knob 40 is formed in a recess on the front surface of the handle 3, and resistance walls 42 that impart frictional resistance to the slide knob 40 are provided on the left and right sides of the inner wall of the handle 3. The slide knob 40 integrally includes a knob body 43 that is slide-guided by a guide portion 41, a slide base 44 that slides and moves along the inner wall of the handle 3, and elastic slide arms 45 formed on the left and right sides of the slide base 44. ing. A friction protrusion 46 that moves along with the knob body 43 while in close contact with the resistance wall 42 is provided in the upper and lower half of the elastic slide arm 45. Further, the resistance wall 42 facing the reciprocating stroke of the elastic slide arm 45 is provided with friction portions 47 for elastically deforming the elastic slide arm 45, and the amount of elastic deformation of the elastic slide arm 45 is applied to both upper and lower ends of the friction portion 47. An increasing friction portion 48 is provided. Reference numeral 49 is a slide groove that slides and guides the operation unit 39a.

When the variable resistor 39 is reciprocated with the slide knob 40, the elastic slide arm 45 is elastically deformed by the friction portion 47 to give friction resistance to the slide knob 40, and the operation portion 39a of the variable resistor 39 is arbitrarily adjusted. Can be stopped and held at the position. Further, by imparting an appropriate operation resistance to the slide knob 40, it is possible to prevent the slide knob 40 from being excessively slid and to make the operation feeling at the time of adjustment smooth and crisp. At the upper and lower ends of the reciprocating stroke of the elastic slide arm 45, the amount of elastic deformation of the elastic slide arm 45 can be increased to increase the operating resistance. Therefore, even when the slide knob 40 is suddenly operated, the operating portion of the variable resistor 39 It is possible to reliably prevent the 39a from impactally colliding with the groove end of the slide groove 49. The output of the variable resistor 39 changes in magnitude only when the friction projection 46 is in contact with the friction portion 47, and the friction projection 46 rides on the friction portion 47 to the friction increasing portion 48 to the stroke end. The control unit 29 controls so that the drive rotation speed of the motor 5 does not change during the movement.

(Warm air mode)
In order to automatically adjust the air volume and temperature of the hair dryer regardless of changes in the environmental temperature and supply warm air with an air volume and temperature suitable for multiple hair treatment conditions, the control unit 29 is as follows. And control the operation. When the main switch 11 is turned on, each of the control circuits 5C, 6C, and 15C receives the operation command signal of the control unit 29, operates the motor 5, the heater 6, and the Peltier element 15, and applies a high-voltage discharge current to the discharge electrode 14. Supply. At this time, the heater 6 is supplied with a drive current so as to have the maximum heat output, and the motor 5 is rotationally driven at a rotation speed corresponding to the output signal of the controller 12 to maintain the first mode. In this state, the mode changeover switch 9 can be changed to switch the operation mode of the hair dryer from the second mode to the fourth mode.

For example, when it is desired to dry the hair after washing the hair, hot air at a high temperature (100 ° C.) is blown out and supplied with the operation mode of the hair dryer set to the first mode. When the drive rotation speed of the motor 5 in this state is the minimum rotation speed, since the air volume of the hot air blown out is small, the slide knob 40 is slid upward to drive the motor 5 rotation speed. By increasing the number of air, the amount of warm air blown out can be increased. However, when the drive rotation speed of the motor 5 increases, the temperature of the warm air decreases by the amount of the increase in the amount of air supplied. In order to prevent such a temperature drop, the control unit 29 automatically increases and adjusts the heat output of the heater 6 based on the detection signal of the temperature sensor 25, and keeps the warm air temperature at 100 degrees Celsius.

As described above, in the first embodiment, in the operating state in which the motor 5 and the heater 6 are driven, the control unit 29 adjusts the drive rotation speed of the motor 5 according to the adjustment signal output from the controller 12 to blow air. The amount of air blown by the fan 4 is adjusted to increase or decrease. Further, in a state where the amount of air blown by the blower fan 4 increases or decreases, the heat output of the heater 6 is automatically increased or decreased based on the detection signal of the temperature sensor 25 (steps S1 to S3 in FIG. 1) to blow the blower fan 4. The warm air temperature can be kept constant regardless of the increase or decrease in the air volume (hereinafter, this control is referred to as normal control). The temperature of the environment in which the hair dryer is used changes greatly depending on the season, but even in that case, the heat output of the heater 6 is automatically increased or decreased based on the detection signal of the temperature sensor 25 to adjust the warm air temperature to the target temperature. Can be held at 100 degrees C. In each of the operation modes of the second mode to the fourth mode, the control unit 29 performs the same normal control as described above, and the temperature of the warm air sent from the hair dryer is the target temperature set in each operation mode. I am trying to be.

(Slow adjustment and rapid adjustment)
When the adjustment speed of the adjustment signal is lower than the predetermined value (hereinafter referred to as slow speed adjustment) due to the difference in the adjustment speed of the controller 12 by the user, and when the adjustment speed of the adjustment signal exceeds the predetermined value (hereinafter referred to as rapid adjustment). Say). The adjustment speed of the adjustment signal can be determined by the amount of voltage change per unit time in the variable resistor 39. For example, a predetermined value is obtained when the amount of voltage change per unit time changes by 5% per 0.1 second. As a (reference), discriminate between slow speed adjustment and rapid adjustment. As shown in FIG. 1, when the slide knob 40 is slowly adjusted, the control unit 29 performs the normal control described above to adjust the warm air temperature in each operation mode to the target temperature. However, when the slide knob 40 is rapidly adjusted, the control unit 29 shifts from the normal control to the preset correction control until a predetermined time elapses to correct the warm air temperature, and determines the temperature. After a lapse of time, it returns to normal control and keeps the warm air temperature constant. The correction control is to forcibly change the control state from the normal control state to the preset minimum output, the maximum output set value, or a set value close to the set value. In the correction control, the control method differs depending on whether the adjustment direction of the slide knob 40 decreases or increases.

(Adjustment for rapid decline and adjustment for rapid increase)
In the rapid adjustment, when the slide knob 40 is rapidly operated from the increasing position to the decreasing position (hereinafter referred to as rapid decreasing adjustment), the slide knob 40 is rapidly operated from the decreasing position to the increasing position. In some cases (hereinafter referred to as rapid increase adjustment). In any case, when the adjustment amount of the slide knob 40 per unit time is small, the drive rotation of the blower fan 4 does not fluctuate significantly, so that the control unit 29 maintains the normal control. However, when the adjustment amount of the slide knob 40 (controller 12) is a rapid adjustment of 50% or more of the adjustment stroke of the slide knob 40 (controller 12) in the friction portion 47, the control unit 29 makes the following corrections. The amount of heat generated by the heater 6 is controlled.

Specifically, as shown in FIGS. 1 and 10, when the adjustment amount of the slide knob 40 is a rapid decrease adjustment of 50% or more of the adjustment stroke (YES in step S4 of FIG. 1), the drive rotation of the motor 5 Since the number drops sharply, the amount of blown air from the blower fan 4 drops sharply, and the heater 6 may overshoot (excessively rise). In order to avoid this, the control unit 29 shifts from the normal control to the correction control when the adjustment amount of the slide knob 40 becomes 50% or more of the adjustment stroke (step S5 in FIG. 1), and the heat output of the heater 6 is generated. Is minimized (step S11 in FIG. 11), and after a predetermined time T1 (0.8 seconds) has elapsed, normal control is restored (YES in step S13 in FIG. 11). When the heat output of the heater 6 is minimized, the control unit 29 stops the drive current supplied to the heater 6 or reduces the pulse width of the drive current and the number of pulses per unit time. When the heat output of the heater 6 is minimized, the supply of the drive current is completely stopped and the heat output of the heater 6 is set to zero (Low). Alternatively, the supply of the drive current is set to a value close to zero, and the heat output of the heater 6 is set to a value close to zero although it is not zero. For example, the pulse width of the drive current is reduced to bring the heat output of the heater 6 closer to zero, or the number of pulses per unit time is reduced to bring the heat output of the heater 6 closer to zero.

When the adjustment amount of the slide knob 40 is a rapid adjustment and the adjustment amount is equal to or more than a preset set value, the normal control is shifted to the correction control. The output voltage of the variable resistor 39 adjusted and operated by the slide knob 40 changes within the range of 2V (100%) to 0V (0%). Based on this, when the output voltage of the variable resistor 39 changes by 1.0 V (50%) or more, and the adjustment speed of the slide knob 40, that is, the adjustment speed of the variable resistor 39 is rapidly adjusted. In addition, the necessary correction control is performed. Specifically, when the amount of voltage change per unit time changes by 5% per 0.1 second, the control unit 29 determines that the adjustment is rapid, and further adjusts the rapid decrease or the rapid increase. Is determined and necessary correction control is performed. For example, when the output voltage of the variable resistor 39 is 1.9V and the slide knob 40 is rapidly adjusted and the output voltage drops to 0.8V, the control unit 29 is rapidly adjusted. , It is determined that the adjustment is in the downward direction, and the normal control is shifted to the correction control. In this way, the control unit 29 satisfies that the adjustment is rapid and the adjustment amount is equal to or larger than the set value, further determines the adjustment direction (increase / decrease direction), and determines whether or not to shift to the correction control. judge.
The adjustment stroke of the controller 12 and the amount of change in the output voltage of the variable resistor 39 are in a proportional relationship. Therefore, the "adjustment stroke of the controller 12" can be read as "the amount of change in the output voltage of the variable resistor 39".

Contrary to the above, as shown in the right half of FIG. 10, when the adjustment amount of the slide knob 40 is a rapid increase adjustment exceeding 50% of the adjustment stroke (YES in step S6 of FIG. 1), the motor Since the drive rotation speed of No. 5 increases sharply, the amount of air blown by the blower fan 4 increases sharply, and the temperature of the heater 6 may undershoot (excessively decrease). In order to avoid this, when the adjustment amount of the slide knob 40 exceeds 50% of the adjustment stroke, the control unit 29 shifts from the normal control to the correction control (step S7 in FIG. 1) to reduce the heat output of the heater 6. The output is maximized (step S21 in FIG. 12), and after a predetermined time T2 (0.55 seconds) has elapsed, normal control is restored (YES in step S23 in FIG. 12). The control unit 29 when maximizing the heat output of the heater 6 sets the drive current supplied to the heater 6 to Hi. Alternatively, the pulse width of the drive current supplied to the heater 6 and the number of pulses per unit time are increased. Specifically, when the heat output of the heater 6 is maximized, the supply of the drive current is set to the Hi state to maximize the heat output of the heater 6. Alternatively, the supply of the drive current is set to a value close to the maximum, and the heat output of the heater 6 is set to a state close to the maximum although not the maximum. For example, the pulse width of the drive current is increased to bring the heat output of the heater 6 closer to the Hi state, or the number of pulses per unit time is increased to bring the heat output of the heater 6 closer to the maximum.

As described above, correction control is performed when the slide knob 40 is adjusted for rapid decrease or rapid increase, and the drive time T1 of the heater 6 when the slide knob 40 is adjusted for rapid decrease and the drive time T1 when the slide knob 40 is adjusted for rapid increase. When the drive time T2 of the heater 6 is set so as to satisfy the inequality (T1> T2), the heater 6 is surely prevented from falling into an overshoot or undershoot, and the warm air temperature with respect to the target temperature is set. The variation width can be reduced.

The adjustment direction of the variable resistor 39 by the slide knob 40 is originally selected to be either the upper side (increase side) or the lower side (decrease side) from an arbitrary adjustment position. However, due to a user's operation error or misunderstanding, the slide knob 40 may be adjusted to rapidly decrease and then rapidly increase within a predetermined time T1 (YES in step S15 of FIG. 11). In such a case, as shown in FIG. 13, when the adjustment amount of the slide knob 40 at the time of rapid decrease adjustment exceeds 50% of the adjustment stroke, the control unit 29 shifts from the normal control to the correction control, but rapidly. When the increase adjustment is confirmed, the control unit 29 leaves the correction control and returns to the normal control (step S14 in FIG. 11), and returns the heat output of the heater 6 to the normal control state. Similarly, when the slide knob 40 is rapidly increased and then rapidly decreased and increased within T2 for a certain period of time (YES in step S25 of FIG. 12), the adjustment amount of the slide knob 40 at the time of the rapid increase adjustment is adjusted. When the stroke exceeds 50%, the control unit 29 shifts from the normal control to the correction control, but when the rapid decrease adjustment is confirmed, the control unit 29 leaves the correction control and returns to the normal control, and the heater The heat output of 6 is returned to the state of normal control.

(Cold air mode)
When the cold air switch 13 is turned on while the hair dryer is being operated in the normal control state of an arbitrary operation mode, as shown in FIGS. 6 and 14, the control unit 29 shuts off the power supply to the heater 6 and is at room temperature. Dry air is sent from the air outlet. After that, when the cold air switch 13 is turned off (turned on again), the control unit 29 shifts to correction control, maximizes the heat output of the heater 6, and drives the heater 6 for a predetermined time T3 (0.75 seconds). After that, it shifts to the normal control, adjusts the heat output of the heater 6 based on the detection signal of the temperature sensor 25, and returns to the warm air mode immediately before switching to the cold air mode. For example, when the warm air mode immediately before switching to the cold air mode is the second mode, the control state of the second mode is restored to control the operating state of the motor 5 and the heater 6.

As described above, when the cold air switch 13 is turned off to return from the cold air mode to the warm air mode, the hot air temperature is changed to the correction control to maximize the heat output of the heater 6 and drive for T3 for a predetermined time. It is possible to shorten the time required to return to the target temperature by rapidly rising the temperature. The relationship between the heater drive time T3 in the correction control and the predetermined times T1 and T2 in the correction control described above is set so as to satisfy the inequality (T1> T3> T2). For example, when T3 = <T2, the amount of heat generated is insufficient due to the short driving time of the heater 6, and the time until the warm air temperature when returning to the warm air mode reaches the target temperature is prolonged. It ends up. In order to compensate for such insufficient heat generation, T3> T2 is set. When using a hair dryer, the suction port 52 may be covered with a towel, a futon, or the like, and the warm air temperature may rise abnormally to, for example, 120 ° C. In such a case, the control unit 29 that receives the output signal of the temperature sensor 25 immediately stops the operation of the motor 5 and the heater 6 and lights the LEDs 31 to 34 for displaying the hot air mode and the LED 35 for displaying the cold air mode. Or blink to let the user know that the hair dryer has stopped abnormally. This abnormal display state can be canceled by turning off the main switch 11, and when the main switch 11 is turned on again, the hair dryer can be operated normally. In addition, a display body (LED) for display may be separately provided, and the display body may be turned on or blinked to notify the user that the hair dryer is stopped in an abnormal state.

(Example 2) In the first embodiment, when the drive rotation speed of the motor 5 is adjusted to be large or small according to the adjustment signal of the controller 12, the heat output of the heater 6 is automatically adjusted based on the detection signal of the temperature sensor 25. The temperature of the warm air can be maintained at the target temperature by adjusting the increase / decrease. However, the heat output of the heater 6 can be adjusted according to the adjustment signal of the controller 12 to increase or decrease the hot air temperature. In that case, when the heat output of the heater 6 is adjusted to be large or small according to the adjustment signal of the controller 12, the control unit 29 automatically increases or decreases the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25. Therefore, the warm air temperature can be maintained at the target temperature. That is, the second embodiment is different from the first embodiment in that the heat output of the heater 6 is adjusted by the controller 12 and the drive rotation speed of the motor 5 is controlled based on the detection signal of the temperature sensor 25, and the other configurations are the first embodiment. Is the same as. Further, in the second embodiment, regarding the control content of the control unit 29, the drive rotation of the motor 5 and the heat output of the heater 6 may be read as the description of the control content described in the first embodiment, and thus the description thereof will be omitted.

The hair dryer in Example 2 can be carried out in the following embodiments. The blower fan 4 in the main body case 1, the motor 5 that rotationally drives the fan 4, the heater 6 that heats the air supplied from the blower fan 4, and the control unit 29 that controls the operating states of the motor 5 and the heater 6. It is a hair dryer provided with. The control unit 29 receives the detection signal of the temperature sensor 25 that detects the temperature of the hot air heated by the heater 6 and the adjustment signal of the controller 12 that adjusts the heat output of the heater 6, and receives the adjustment signal of the blower fan 4 and the heater 6. Control the drive state. Further, the control unit 29 is configured to adjust the heat output of the heater 6 according to the adjustment signal output from the controller 12 in the operating state in which the motor 5 and the heater 6 are driven so that the hot air temperature can be increased or decreased. It is done. In a state where the heat output of the heater 6 changes, the control unit 29 automatically increases or decreases the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25 to keep the warm air temperature constant. It is characterized by being.

According to the hair dryer provided with the control unit 29 as described above, the warm air temperature of the hair dryer is automatically adjusted regardless of the environmental temperature, and the air volume and temperature temperature suitable for a plurality of hair treatment states are adjusted. Can supply wind. Further, even when the user operates the controller 12 to adjust the ventilation temperature to a desired temperature, the control unit 29 automatically increases or decreases the drive rotation speed of the motor 5 based on the detection signal of the temperature sensor 25. As a result, the temperature of the warm air can be kept constant, so that the hair can be treated accurately while always supplying the warm air at an appropriate temperature.

Depending on the difference in the adjustment speed of the controller 12 by the user, there are slow adjustment in which the adjustment speed of the adjustment signal is lower than the predetermined value and rapid adjustment in which the adjustment speed of the adjustment signal exceeds the predetermined value. When the adjustment state of the controller 12 is slow speed adjustment, the control unit 29 performs normal control for adjusting the drive rotation speed of the motor 5 to a large or small level based on the detection signal of the temperature sensor 25 to keep the warm air temperature constant. It is configured to hold in. Further, when the adjustment state of the controller 12 is a rapid adjustment, the control unit 29 departs from the normal control and shifts to the preset correction control until a predetermined time elapses to warm the temperature. The air temperature is corrected, and after a predetermined time elapses, the normal control is restored and the warm air temperature is maintained at a constant level.

As described above, when the controller 12 is adjusted at a slow speed, the normal control is performed because the change width of the heat output of the heater 6 due to the slow speed adjustment is small, and the motor surely follows the adjustment operation of the heater 6. This is because the drive rotation speed of 5 can be accurately controlled by normal control. Further, when the correction control is performed when the adjustment state of the controller 12 is rapid adjustment, the drive rotation speed of the motor 5 is appropriately controlled in a state corresponding to the adjustment operation of the heater 6, and the temperature supplied from the hair dryer is increased. This is because the temperature of the wind can be brought close to the target temperature and the temperature of the warm air can be kept constant. If the normal control is continued when the controller 12 is rapidly adjusted, the drive rotation speed of the motor 5 cannot be quickly controlled following the adjustment operation of the controller 12, and the warm air supplied from the hair dryer cannot be controlled quickly. The temperature of is greatly deviated from the target temperature.

When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 decreases, if the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 shifts to the correction control and the motor The drive rotation speed of 5 is minimized so that the normal control is restored after the predetermined time T1 has elapsed.

As described above, when the adjustment state of the controller 12 is the rapid decrease adjustment, the control unit 29 shifts to the correction control, minimizes the drive rotation speed of the motor 5, and drives the motor 5 for a predetermined time T1. The drive rotation speed of the motor 5 can be reduced in response to a sudden decrease in heat output. As a result, it is possible to prevent the heater 6 from falling into an undershoot. Further, after the correction control is started and the predetermined time T1 elapses, the normal control is restored and the temperature of the hot air supplied from the hair dryer is kept constant.

When the adjustment amount of the controller 12 is a rapid decrease adjustment of 50% or more of the adjustment stroke of the controller 12, the control unit 29 shifts from the normal control to the correction control, and returns to the normal control after the predetermined time T1 has elapsed. Configure to do.

As described above, when the adjustment amount of the controller 12 is a rapid decrease adjustment of 50% or more of the adjustment stroke of the controller 12, the control unit 29 shifts from the normal control to the correction control and sets the drive rotation speed of the motor 5. When minimized, it is possible to eliminate the needlessly large adjustment of the drive rotation of the motor 5. For example, when the adjustment amount of the controller 12 is 30% of the adjustment stroke of the controller 12, if the correction control is performed to minimize the drive rotation of the motor 5, the control for the correction becomes excessive and the control result is Will vary greatly from the target temperature. As a result, it takes time for the temperature of the hot air sent from the hair dryer to settle to the target temperature. The control unit 29 returns to the normal control after a predetermined time T1 has elapsed from the start of the correction control, and keeps the temperature of the warm air supplied from the hair dryer constant.

When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 increases, if the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 shifts to the correction control and the motor 5 The drive rotation speed of the above is maximized so that the normal control is restored after the predetermined time T2 has elapsed.

As described above, when the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 shifts to the correction control, maximizes the drive rotation speed of the motor 5, and drives the motor 5 for a predetermined time T2. The drive speed of the motor 5 can be increased in response to a rapid increase in heat output. This makes it possible to prevent the heater 6 from falling into an overshoot. Further, after the correction control is started and T2 elapses for a predetermined time, the normal control is restored and the temperature of the hot air supplied from the hair dryer is kept constant.

When the adjustment amount of the controller 12 is a rapid increase adjustment exceeding 50% of the adjustment stroke of the controller 12, the control unit 29 shifts to the correction control and returns to the normal control after the predetermined time T2 has elapsed. Configure to.

As described above, when the adjustment amount of the controller 12 is a rapid increase adjustment of 50% or more of the adjustment stroke of the controller 12, the control unit 29 shifts from the normal control to the correction control and sets the drive rotation speed of the motor 5. When maximized, it is possible to eliminate the needlessly large adjustment of the drive rotation speed of the motor 5. For example, when the adjustment amount of the controller 12 per unit time is 20% of the adjustment stroke of the controller 12, if the correction control is performed to maximize the drive rotation speed of the motor 5, the control for the correction becomes excessive. Therefore, the control result greatly varies from the target temperature. As a result, it takes time for the temperature of the hot air sent from the hair dryer to settle to the target temperature. The control unit 29 returns to the normal control after a predetermined time T2 has elapsed from the start of the correction control, and keeps the temperature of the warm air supplied from the hair dryer constant.

When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 decreases, if the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 shifts to the correction control and the motor The drive rotation speed of 5 is minimized so that the normal control is restored after the predetermined time T1 has elapsed. When the controller 12 is adjusted from an arbitrary adjustment position to the side where the heat output of the heater 6 increases, if the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 shifts to the correction control and the motor The drive rotation speed of 5 is maximized so that the normal control is restored after the predetermined time T2 has elapsed.

As described above, when the controller 12 is adjusted for rapid decrease, the control unit 29 shifts to correction control to minimize the drive rotation speed of the motor 5, and when the controller 12 is adjusted for rapid increase, the control unit 29 corrects. The shift to control was made to maximize the drive rotation speed of the motor 5. According to such a control mode, the drive rotation speed of the motor 5 can be optimized corresponding to all the rapid adjustment operations by the controller 12, and the temperature of the hot air supplied from the hair dryer can be kept constant.

The drive time T1 of the motor 5 when the adjustment state of the controller 12 is the rapid decrease adjustment and the drive time T2 of the motor 5 when the adjustment state of the controller 12 is the rapid increase adjustment satisfy the inequality (T1 <T2). Set to.

As described above, the drive time T1 of the motor 5 when the controller 12 is rapidly reduced and adjusted and the drive time T2 of the motor 5 when the controller 12 is rapidly increased and adjusted satisfy the inequality (T1 <T2). The reason why it is set as is as follows. When the controller 12 is rapidly increased and adjusted, the heat output of the heater 6 is rapidly increased. Therefore, by lengthening the drive time T2 of the motor 5, the temperature of the hot air supplied from the hot air dryer can be brought closer to the target temperature in a shorter time. Therefore, the relationship between the time T1 and the time T2 may be (T1 <T2).

When the controller 12 is rapidly increased and adjusted within the predetermined time T1 after the controller 12 is rapidly decreased, the control unit 29 is configured to control the drive rotation speed of the motor 5 based on the normal control.

As described above, when the controller 12 is adjusted to rapidly decrease and then the controller 12 is adjusted to increase rapidly within a predetermined time T1, the control unit 29 controls the drive rotation speed of the motor 5 based on the normal control. For the following reasons. In the state where the controller 12 is rapidly lowered and adjusted, the control unit 29 temporarily switches to the correction control to minimize the drive rotation speed of the motor 5. However, if the controller 12 is rapidly increased and adjusted before the predetermined time T1 elapses after switching to the correction control, the drive rotation of the motor 5 is completed before the correction control for minimizing the drive rotation speed of the motor 5 is completed. It becomes necessary to perform correction control in the direction in which the number increases. In such a case, since the drive rotation speed of the motor 5 is maximized, the heater 6 is likely to fall into an undershoot state. In order to prevent such a problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without maximizing the drive rotation speed of the motor 5.

When the controller 12 is adjusted to rapidly increase and then rapidly decrease within T2 for a certain period of time, the control unit 29 is configured to control the drive rotation speed of the motor 5 based on the normal control.

As described above, when the controller 12 is adjusted to increase rapidly and then the controller 12 is adjusted to decrease rapidly within the predetermined time T2, the control unit 29 controls the drive rotation speed of the motor 5 based on the normal control. For the following reasons. In the state where the controller 12 is rapidly increased and adjusted, the control unit 29 temporarily switches to the correction control to maximize the drive rotation speed of the motor 5. However, if the controller 12 is rapidly lowered and adjusted before the predetermined time T2 elapses after switching to the correction control, the drive rotation speed of the motor 5 increases before the correction control for increasing the drive rotation speed of the motor 5 is completed. It becomes necessary to perform correction control in the direction in which the value decreases. In such a case, since the drive rotation speed of the motor 5 is minimized, the heater 6 is likely to fall into an overshoot state. In order to prevent such a problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without minimizing the drive rotation speed of the motor 5.

In the above embodiment, the controller 12 is configured by using the slide-type variable resistor 39, but it is not necessary, and the controller 12 may be configured by using the dial-type variable resistor. In the above embodiment, the case where the blower fan 4 is an axial fan has been described, but it is not necessary to use the blower fan 4, and the blower fan 4 may be a turbofan or a sirocco fan. Further, the hair dryer does not have to be a hand-held hair dryer, and may be a stationary hair dryer. The warm air dryer is a concept that includes a foot dryer, a hand dryer, a nail dryer, an animal dryer, and the like, in addition to the hair dryer.

In the correction control in the first embodiment, the control state is forcibly changed from the normal control state to the preset minimum output set value or a set value close to the set value at the time of the rapid decrease adjustment, but it is not necessary. For example, the preset minimum output may be set to half the heat output in the Hi state. That is, the minimum output is to reduce the heat output to a preset minimum heat output set value or a set value close to it, and is not necessarily limited to zero or a value close to zero. Similarly, during the rapid increase adjustment, the control state is forcibly changed from the normal control state to the preset maximum output set value or a set value close to it, but it is not necessary. For example, the preset minimum output may be set to half the heat output in the Hi state. In other words, minimizing the output means increasing the heat output to a preset maximum heat output set value or a set value close to it, and is not necessarily limited to the Hi state or a value close to it. ..

1 Main body case 3 Handle 4 Blower fan 5 Motor 6 Heater 9 Mode changeover switch 10 Display unit 11 Main switch 12 Controller 13 Cold air switch 22 Heater board 23 Heater wire 25 Temperature sensor 29 Control unit 31 to 34 Hot air mode display (LED)
35 Cold air mode display (LED)
39 Variable resistor 40 Slide knob

Claims (5)

A main body case (1) provided with a blower fan (4), a motor (5) for rotationally driving the fan (4), and a heater (6) for heating the air supplied from the blower fan (4). , A hot air dryer equipped with a handle (3) connected to the main body case (1).
The operation mode of the hot air dryer is a hot air mode that drives the motor (5) and the heater (6) to supply hot air, and a cold air mode that drives only the motor (5) to supply cold air. I have
On the side surface of the main body case (1), a warm air mode display body (31 to 34) that emits light in the warm air mode and a cold air mode display body (35) that emits light in the cold air mode are provided.
The hot air mode display (31 to 34) and the cold air mode display (35) are arranged adjacent to each other, and the emission color of the cold air mode display (35) is the emission color of the warm air mode display (31 to 34). I'm making it different
The warm air mode has multiple hot air modes with different hot air temperatures.
A plurality of warm air mode indicators (31 to 34) are provided corresponding to each warm air mode.
A plurality of hot air mode display bodies (31 to 34) and cold air mode display bodies (35) are arranged in a straight line, and the cold air mode display body (35) is located at the end of the row.
A linear window plate (36) covering the outer surfaces of the plurality of hot air mode display bodies (31 to 34) and the cold air mode display body (35) is provided .
The distance between the cold air mode display body (35) and one end of the linear window plate (36) is set shorter than the distance between the adjacent hot air mode display bodies (31 to 34). A featured warm air dryer. A claim, wherein a mode changeover switch (9) is arranged on a side surface of a main body case (1) in which a hot air mode display body (31 to 34) and a cold air mode display body (35) are arranged. The warm air dryer according to 1. A cold air mode display (35) is arranged between the hot air mode display (31 to 34) and the mode changeover switch (9), and the warm air mode display (31 to 34) and the cold air mode display (35) are arranged. The warm air dryer according to claim 2, wherein the mode changeover switch (9) and the mode changeover switch (9) are arranged in a straight line. The hot air dryer according to claim 2 or 3, wherein a plurality of hot air modes can be switched each time the mode changeover switch (9) is turned on. The fourth aspect of the present invention is characterized in that each time the mode changeover switch (9) is turned on, the mode can be sequentially changed from the hot air mode having a high hot air temperature to the hot air mode having a low hot air temperature. Warm air dryer.

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