HK1248079B - Hot air dryer - Google Patents

Description

Hot air dryer

Technical Field

The present invention relates to a hot air dryer including a control unit for controlling the operating states of a blower fan and a heater so as to always optimize the temperature of hot air supplied from the hot air dryer.

Background Art

A hair dryer (hot air dryer) equipped with such a control unit is known from Patent Document 1, for example. In this case, a phase control circuit is provided between the two terminals of the switching switch, and the junction point of the variable resistor and the capacitor of the phase control circuit is connected to a common terminal via a resistor for changing the conduction angle of the three-terminal bidirectional conduction. The motor and the heater of the blower fan are connected in parallel with the phase control circuit. If the previous switching switch is switched to one side to connect the phase control circuit to the parallel circuit of the motor and the heater, the driving speed of the motor can be adjusted and the air volume of the hot air can be continuously changed between a breeze and a strong wind by operating the variable resistor while supplying hot air at a constant temperature. In addition, if the previous switching switch is switched to the other side to connect the phase control circuit to the heater side, the heat generation of the heater can be continuously changed between zero and a maximum value by operating the variable resistor while the air volume supplied by the blower fan is constant.

Prior art literature

Patent Literature

Patent Document 1: Japanese Utility Model Publication No. 56-2883 (page 1, right column, lines 18 to 35, Figure 1)

Summary of the Invention

Problems to be solved by the invention

The hair dryer disclosed in Patent Document 1 can continuously change the hot air volume while supplying hot air at a constant temperature by switching a switch, or it can continuously change the heating value of the heater while supplying a constant amount of hot air. However, when the ambient temperature changes, the temperature of the hot air supplied from the outlet changes, necessitating the user to adjust the variable resistor accordingly. Furthermore, even if the variable resistor is adjusted to raise or lower the hot air temperature, the time lag in the adjustment makes it difficult to achieve the appropriate hot air temperature all at once. Furthermore, the hot air temperature suitable for hair treatment differs between when drying hair and when styling a hairstyle, necessitating the user repeatedly adjusting the air volume and heater temperature to adjust the hot air temperature.

An object of the present invention is to provide a hot air dryer with good usability that can automatically adjust the air volume and temperature of the hot air dryer regardless of the ambient temperature and supply hot air at a volume and temperature suitable for various hair treatment conditions.

An object of the present invention is to provide a hot air dryer capable of adjusting heater output regardless of the air volume supplied by a blower fan to supply hot air of a constant temperature suitable for a plurality of hair treatment modes.

An object of the present invention is to provide a hot air dryer capable of adjusting the air flow rate of a blower fan regardless of heater output to supply hot air of a constant temperature suitable for a plurality of hair treatment modes.

Means for solving problems

As shown in Figures 2 and 5 , the hot air dryer of the present invention is equipped with a main body housing 1 comprising a blower fan 4, a motor 5 that rotates and drives the blower fan 4, a heater 6 that heats the air supplied by the blower fan 4, and a control unit 29 that controls the operating states of the motor 5 and heater 6. The control unit 29 receives the output signal of a temperature sensor 25 for detecting the temperature of the hot air heated by the heater 6 and an adjustment signal from a controller 12 for adjusting the driving speed of the motor 5 to control the driving state of the motor 5 and heater 6. Specifically, the control unit 29 is capable of adjusting the driving speed of the motor 5 based on the adjustment signal output from the controller 12 while the motor 5 and heater 6 are being driven, thereby increasing or decreasing the air flow rate of the blower fan 4. Furthermore, the control unit 29 is configured to automatically increase or decrease the heat output of the heater 6 based on the detection signal from the temperature sensor 25 to maintain a constant temperature of the hot air while the air flow rate of the blower fan 4 is increasing or decreasing.

Depending on the difference in the adjustment speed of controller 12 performed by the user, there are two modes: slow adjustment, in which the adjustment speed of the adjustment signal is less than a predetermined value, and fast adjustment, in which the adjustment speed of the adjustment signal is greater than a predetermined value. When the adjustment state of controller 12 is slow adjustment, control unit 29 is configured to perform normal control, which increases or decreases the heat output of heater 6 based on the detection signal of temperature sensor 25, to maintain a constant hot air temperature. Furthermore, when the adjustment state of controller 12 is fast adjustment, control unit 29 is configured to switch to correction control to correct the hot air temperature within a predetermined period of time after leaving normal control, and then return to normal control after the predetermined period of time to maintain a constant hot air temperature.

When the controller 12 is adjusted from any adjustment position to the side where the driving speed of the motor 5 decreases, and the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 switches to correction control to minimize the heat output of the heater 6, and returns to normal control after a predetermined time T1.

As shown in FIG. 10 , the control unit 29 is configured to switch from normal control to correction control in the case of a rapid descent adjustment in which the adjustment amount of the controller 12 is 50% or more of the adjustment stroke of the controller 12 , and to return to normal control after a predetermined time T1 has elapsed.

When the controller 12 is adjusted from any adjustment position to the side where the driving speed of the motor 5 increases, and the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 switches to correction control to maximize the heat output of the heater 6, and returns to normal control after a predetermined time T2.

As shown in FIG. 10 , the control unit 29 is configured to switch to correction control when the adjustment amount of the controller 12 is 50% or more of the adjustment stroke of the controller 12 during rapid increase adjustment, and to return to normal control after a predetermined time T2 has elapsed.

When the controller 12 is adjusted from any adjustment position to a side where the driving speed of the motor 5 decreases, and the adjustment state of the controller 12 is a rapid decreasing adjustment, the control unit 29 switches to correction control to minimize the heat output of the heater 6, and returns to normal control after a predetermined time T1 has elapsed. When the controller 12 is adjusted from any adjustment position to a side where the driving speed of the motor 5 increases, and the adjustment state of the controller 12 is a rapid increasing adjustment, the control unit 29 switches to correction control to maximize the heat output of the heater 6, and returns to normal control after a predetermined time T2 has elapsed.

It is assumed that the driving time T1 of the heater 6 when the adjustment state of the controller 12 is the rapid decrease adjustment and the driving time T2 of the heater 6 when the adjustment state of the controller 12 is the rapid increase adjustment satisfy the inequality (T1>T2).

As shown in FIG. 13 , the control unit 29 is configured to control the heat output of the heater 6 based on normal control when the controller 12 is rapidly increased within a predetermined time T1 after the controller 12 is rapidly decreased.

As shown in FIG. 13 , the control unit 29 is configured to control the heat output of the heater 6 based on normal control when the controller 12 is rapidly decreased within a certain time T2 after the controller 12 is rapidly increased.

Another hot air dryer according to the present invention includes a main body housing 1 equipped with a blower fan 4, a motor 5 for rotating and driving the blower fan 4, a heater 6 for heating the air supplied by the blower fan 4, and a control unit 29 for controlling the operating state of the motor 5 and heater 6. The control unit 29 receives a detection signal from a temperature sensor 25 for detecting the temperature of the hot air heated by the heater 6 and an adjustment signal from a controller 12 for adjusting the heat output of the heater 6 to control the driving state of the motor 5 and heater 6. Specifically, the control unit 29 is capable of adjusting the heat output of the heater 6 according to the adjustment signal output from the controller 12 while the motor 5 and heater 6 are in the driving state, thereby increasing or decreasing the temperature of the hot air. When the heat output of the heater 6 increases or decreases, the control unit 29 automatically increases or decreases the driving speed of the motor 5 based on the detection signal from the temperature sensor 25 to maintain a constant temperature of the hot air.

Depending on the user's adjustment speed of controller 12, there are two modes: slow adjustment (in which the adjustment signal's adjustment speed is less than a predetermined value) and fast adjustment (in which the adjustment signal's adjustment speed is greater than a predetermined value). When controller 12 is in slow adjustment mode, control unit 29 is configured to perform normal control, adjusting the drive speed of motor 5 based on the detection signal from temperature sensor 25, to maintain a constant hot air temperature. Furthermore, when controller 12 is in fast adjustment mode, control unit 29 switches to a pre-set correction control to correct the hot air temperature within a predetermined period of time after leaving normal control, and then returns to normal control after the predetermined period of time to maintain a constant hot air temperature.

When the controller 12 is adjusted from any adjustment position to the side where the heat output of the heater 6 decreases, and the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 switches to correction control to minimize the driving speed of the motor 5, and returns to normal control after a predetermined time T1.

In the case of a rapid descent adjustment in which the adjustment amount of the controller 12 exceeds 50% of the adjustment stroke of the controller 12, the control unit 29 switches from normal control to correction control to minimize the driving speed of the motor 5, and returns to normal control after a predetermined time T1.

When the controller 12 is adjusted from any adjustment position to the side where the heat output of the heater 6 increases, and the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 switches to correction control to maximize the driving speed of the motor 5, and returns to normal control after a predetermined time T2.

In the case of a rapid increase adjustment in which the adjustment amount of the controller 12 exceeds 50% of the adjustment stroke of the controller 12 , the control portion 29 switches to the correction control and returns to the normal control after a predetermined time T2 has elapsed.

When the controller 12 is adjusted from any adjustment position to a side where the heat output of the heater 6 decreases, and the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 switches to correction control to minimize the drive speed of the motor 5, and returns to normal control after a predetermined time T1 has elapsed. Furthermore, when the controller 12 is adjusted from any adjustment position to a side where the heat output of the heater 6 increases, and the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 switches to correction control to maximize the drive speed of the motor 5, and returns to normal control after a predetermined time T2 has elapsed.

It is assumed that the driving time T1 of the motor 5 when the adjustment state of the controller 12 is the rapid decrease adjustment and the driving time T2 of the motor 5 when the adjustment state of the controller 12 is the rapid increase adjustment satisfy the inequality (T1<T2).

When the controller 12 is rapidly increased within the predetermined time T1 after the controller 12 is rapidly decreased, the control unit 29 controls the driving rotation speed of the motor 5 based on the normal control.

When the controller 12 is rapidly increased and then rapidly decreased within a certain time period T2, the control unit 29 controls the driving speed of the motor 5 based on the normal control.

The main body casing 1 is provided with a plurality of temperature sensors 25. The control unit 29 controls the driving states of the ventilation fan 4 and the heater 6 based on a detection signal of the temperature sensor 25 that detects the highest temperature among the plurality of temperature sensors 25.

The hot air dryer has two operating modes: a hot air mode in which the motor 5 and 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. When the operating mode is switched from the cold air mode to the hot air mode, the control unit 29 switches to correction control to maximize the heat output of the heater 6. After driving the heater 6 for a predetermined time T3, the control unit 29 switches to normal control and adjusts the heat output of the heater 6 based on the detection signal of the temperature sensor 25.

The heater 6 driving time T1 during the rapid decrease adjustment, the heater 6 driving time T2 during the rapid increase adjustment, and the heater 6 driving time T3 during the correction control are set to satisfy the inequality (T1>T3>T2).

3 , hot air mode indicators 31 to 34 that illuminate in hot air mode and a cool air mode indicator 35 that illuminates in cool air mode are provided on the outer surface of the main body housing 1. The hot air mode indicators 31 to 34 and the cool air mode indicator 35 are adjacently arranged.

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

A cool air mode indicator 35 is arranged between the hot air mode indicators 31 to 34 and the mode changeover switch 9 .

The hot air mode indicator bodies 31 to 34 and the cool air mode indicator 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 operating in the hot air mode to the cold air mode are arranged at positions away from the housing structure consisting of the main body housing 1 and the handle 3 .

As shown in FIG. 2 , hot air mode indicators 31 to 34 , a cold air mode indicator 35 , and a mode changeover switch 9 are arranged on the main body housing 1 , and a cold air switch 13 is arranged on the handle 3 .

The heater 6 comprises an insulating plate-shaped heater substrate 22 and a heater wire 23 spirally wound around the heater substrate 22. The temperature sensor 25 comprises a radial lead thermistor with a detection portion 25a and a pair of lead portions 25b. As shown in FIG4 , the temperature sensor 25 is fixed to terminals 26 of the heater substrate 22, with the pair of lead portions 25b positioned on the front and back surfaces of the heater substrate 22.

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

As shown in FIG8 , the controller 12 includes a sliding variable resistor 39 and a sliding handle 40 mounted on the handle 3 for reciprocatingly operating an operating portion 39a of the variable resistor 39. The handle 3 is provided with a guide portion 41 for slidably guiding the sliding handle 40 and a resistance wall 42 for applying frictional resistance to the sliding handle 40. The sliding handle 40 includes a handle body 43 slidably guided by the guide portion 41 and an elastic sliding arm 45 that slidably contacts the resistance wall 42. The frictional resistance between the elastic sliding arm 45 and the resistance wall 42 acts on the reciprocating sliding handle 40, thereby applying operational resistance to the sliding handle 40.

The resistance wall 42 facing both ends of the reciprocating stroke of the elastic sliding arm 45 is provided with a friction increasing portion 48 for increasing the elastic deformation amount of the elastic sliding arm 45 .

Effects of the Invention

The hot air dryer of the present invention is configured such that the control unit 29 receives the output signal of the temperature sensor 25 and the adjustment signal from the controller 12 to control the driving state of the motor 5 and the heater 6. Specifically, when the motor 5 and the heater 6 are in the driving state, the control unit 29 can adjust the driving speed of the motor 5 according to the adjustment signal output from the controller 12, thereby increasing or decreasing the air flow of the blower fan 4. Furthermore, the control unit 29 is configured to automatically increase or decrease the heat output of the heater 6 according to the detection signal from the temperature sensor 25 when the air flow of the blower fan 4 increases or decreases, thereby maintaining a constant hot air temperature regardless of the increase or decrease in the air flow of the blower fan 4.

A hot air dryer equipped with the aforementioned control unit 29 can automatically adjust the hot air temperature of the hot air dryer regardless of the ambient temperature, thereby supplying hot air at a volume and temperature suitable for various hair treatment conditions. Furthermore, even when the user operates the controller 12 to adjust the air volume supplied by the blower fan 4 to a desired volume, the control unit 29 can automatically increase or decrease the heat output of the heater 6 based on the detection signal from the temperature sensor 25, regardless of the change in the air volume supplied by the blower fan 4, thereby maintaining a constant hot air temperature.

When the controller 12 is in the slow adjustment mode, the control unit 29 performs normal control, increasing or decreasing the heat output of the heater 6 based on the detection signal from the temperature sensor 25, to maintain a constant hot air temperature. Normal control is performed when the controller 12 is in the slow adjustment mode because the change in the driving speed of the motor 5 caused by the slow adjustment is small. Therefore, the normal control mode can reliably follow the adjustment of the motor 5 and accurately control the heat output of the heater 6. Alternatively, if correction control is performed when the controller 12 is in the fast adjustment mode, the heat output of the heater 6 can be appropriately controlled in accordance with the adjustment of the motor 5, thereby bringing the temperature of the hot air supplied from the hot air dryer close to the target temperature and maintaining the hot air temperature constant. Furthermore, if normal control continues while the controller 12 is in the fast adjustment mode, the heat output of the heater 6 cannot be quickly controlled to follow the adjustment of the controller 12, causing the temperature of the hot air supplied from the hot air dryer to deviate significantly from the target temperature.

When the controller 12 is in the rapid-descent adjustment mode, the control unit 29 switches to correction control, minimizing the heat output of the heater 6 and driving it for a predetermined time T1. This reduces the heat output of the heater 6 in response to the sudden decrease in the drive speed of the motor 5. This prevents the heater 6 from overshooting. Furthermore, after the predetermined time T1 has elapsed after the correction control is initiated, normal control is restored to maintain a constant temperature of the hot air supplied from the hot air dryer. To minimize the heat output of the heater 6, the drive current supplied to the heater 6 is stopped, or the pulse width and number of pulses per unit time of the drive current are reduced.

In the case of a rapid decrease adjustment where the controller 12's adjustment amount is greater than 50% of the controller 12's adjustment stroke, if the control unit 29 switches from normal control to correction control to minimize the heater 6's heat output, it is possible to prevent the heater 6's heat output from being adjusted excessively. For example, if the controller 12's adjustment amount is 30% of the controller 12's adjustment stroke, performing correction control to minimize the heater 6's heat output will result in excessive correction control, causing the control results to deviate significantly from the target temperature. As a result, it takes time for the hot air temperature supplied from the hot air dryer to stabilize at the target temperature. After a predetermined time T1 has passed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature for the hot air supplied from the hot air dryer.

When the controller 12 is in the rapid increase adjustment mode, the control unit 29 switches to correction control to maximize the heat output of the heater 6 and drive it for a predetermined time T2. This increases the heat output of the heater 6 in response to the rapid increase in the drive speed of the motor 5. This prevents the heater 6 from undershooting. Furthermore, after the predetermined time T2 has elapsed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature of the hot air supplied from the hot air dryer. To maximize the heat output of the heater 6, the drive current supplied to the heater 6 is maximized, or the pulse width and number of pulses per unit time of the drive current are increased.

In the case of a rapid increase in the controller 12's adjustment amount, which is greater than or equal to 50% of the controller 12's adjustment stroke, if the control unit 29 switches from normal control to correction control to maximize the heater 6's heat output, it is possible to prevent the heater 6's heat output from being adjusted unnecessarily significantly. For example, if the controller 12's adjustment amount is 20% of the controller 12's adjustment stroke, performing correction control to maximize the heater 6's heat output will result in excessive correction control, causing the control results to deviate significantly from the target temperature. As a result, it takes time for the hot air temperature supplied from the hot air dryer to stabilize at the target temperature. After a predetermined time T1 has passed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature for the hot air supplied from the hot air dryer.

When the controller 12 is rapidly decreasing, the control unit 29 switches to correction control to minimize the heat output of the heater 6. When the controller 12 is rapidly increasing, the control unit 29 switches to correction control to maximize the heat output of the heater 6. This control method optimizes the heat output of the heater 6 in response to all rapid adjustments made by the controller 12, maintaining a constant temperature of the hot air supplied from the hot air dryer.

The reason why the drive time T1 of the heater 6 when the controller 12 is adjusted to a rapid decrease and the drive time T2 of the heater 6 when the controller 12 is adjusted to a rapid increase satisfy the inequality (T1>T2) is as follows. The temperature of the heater 6 in the state of maximum heat output is further heated from the state of being heated and maintaining a large amount of heat before the maximum output, causing the degree of heat increase to increase. Therefore, it is possible to approach the target temperature in a shorter time and it is easier to fall into overshoot. Therefore, by quickly switching from correction control to normal control, it is possible to reliably avoid falling into overshoot. Therefore, the relationship between time T1 and time T2 is (T1>T2).

The reason why the control unit 29 controls the heat output of the heater 6 based on normal control when the controller 12 is rapidly increased within a predetermined time T1 after the controller 12 is rapidly decreased is as follows. In the state where the controller 12 is rapidly decreased, the control unit 29 temporarily switches to correction control to minimize the heat output of the heater 6. However, if the controller 12 is rapidly increased before the predetermined time T1 has passed since the switch to correction control, correction control in the direction of temperature increase must be performed before the correction control of the temperature decrease of the heater 6 is completed. In this case, since the heat output of the heater 6 is maximized, the heater 6 is prone 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 normal control when the controller 12 is rapidly decreased within a predetermined time T2 after the controller 12 is rapidly increased is as follows. In the state where the controller 12 is rapidly increased, the control unit 29 temporarily switches to correction control to maximize the heat output of the heater 6. However, if the controller 12 is rapidly decreased before the predetermined time T2 has passed since the switch to correction control, correction control in the direction of temperature decrease must be performed before the correction control of the temperature increase of the heater 6 ends. In this case, since the heat output of the heater 6 is minimized, the heater 6 is prone 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.

Another hot air dryer of the present invention is configured such that a control unit 29 receives an output signal from a temperature sensor 25 and an adjustment signal from a controller 12 to control the driving state of the motor 5 and the heater 6. Specifically, when the motor 5 and heater 6 are in a driven operating state, the control unit 29 can adjust the heat output of the heater 6 based on the adjustment signal output from the controller 12, thereby increasing or decreasing the hot air temperature. Furthermore, when the heat output of the heater 6 increases or decreases, the control unit 29 can automatically increase or decrease the driving speed of the motor 5 based on the detection signal from the temperature sensor 25, thereby maintaining a constant hot air temperature regardless of changes in the heat output of the heater 6.

According to the hot air dryer equipped with the control unit 29 described above, the hot air temperature of the hot air dryer can be automatically adjusted regardless of the ambient temperature. In addition, even if the user operates the controller 12 to adjust the air supply temperature to a preferred temperature, the control unit 29 can automatically increase or decrease the driving speed of the motor 5 based on the detection signal of the temperature sensor 25 to maintain a constant hot air temperature.

When the controller 12 is in the slow adjustment state, the control unit 29 performs normal control, which increases or decreases the drive speed of the motor 5 based on the detection signal from the temperature sensor 25, to maintain a constant temperature for the hot air. Normal control is performed when the controller 12 is in the slow adjustment state because the variation in the heat output of the heater 6 caused by the slow adjustment is small, allowing the normal control state to reliably follow the adjustment of the heater 6 and accurately control the drive speed of the motor 5. Furthermore, when the controller 12 is in the fast adjustment state, correction control is performed, allowing the drive speed of the motor 5 to be appropriately controlled in accordance with the adjustment of the heater 6, bringing the temperature of the hot air supplied from the hot air dryer close to the target temperature and maintaining a constant hot air temperature. Furthermore, if normal control is continued while the controller 12 is in the fast adjustment state, the drive speed of the motor 5 cannot be quickly controlled to follow the adjustment of the controller 12, causing the temperature of the hot air supplied from the hot air dryer to deviate significantly from the target temperature.

When the controller 12 is in the rapid-descent adjustment mode, if the control unit 29 switches to correction control to minimize the drive speed of the motor 5 and drive it for a predetermined time T1, the drive speed of the motor 5 can be reduced in response to the sharp drop in the heat output of the heater 6. This prevents the heater 6 from undershooting. Furthermore, after the predetermined time T1 has elapsed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature of the hot air supplied from the hot air dryer. While minimizing the drive speed of the motor 5, the drive current supplied to the motor 5 is stopped, or the pulse width and number of pulses per unit time of the drive current are reduced.

In the case of a rapid decrease adjustment where the controller 12's adjustment amount is greater than 50% of the controller 12's adjustment stroke, if the control unit 29 switches from normal control to correction control to minimize the drive speed of the motor 5, it is possible to prevent the drive speed of the motor 5 from being adjusted unnecessarily significantly. For example, if correction control is performed to minimize the drive speed of the motor 5 when the controller 12's adjustment amount is 30% of the controller 12's adjustment stroke, the control used for correction will become excessive, causing the control result to deviate significantly from the target temperature. As a result, it takes time for the hot air temperature supplied from the hot air dryer to stabilize at the target temperature. After a predetermined time T1 has passed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature of the hot air supplied from the hot air dryer.

When the controller 12 is in the rapid increase adjustment mode, if the control unit 29 switches to correction control to maximize the drive speed of the motor 5 and drive it for a predetermined time T2, the drive speed of the motor 5 can be increased in response to the rapid increase in the heat output of the heater 6. This prevents the heater 6 from overshooting. Furthermore, after the predetermined time T2 has elapsed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature of the hot air supplied from the hot air dryer. To maximize the drive speed of the motor 5, the drive current supplied to the motor 5 is maximized, or the pulse width and number of pulses per unit time of the drive current are increased.

In the case of a rapid increase in the controller 12's adjustment amount exceeding 50% of the controller 12's adjustment stroke, if the control unit 29 switches from normal control to correction control to maximize the drive speed of the motor 5, this can prevent the drive speed of the motor 5 from being adjusted unnecessarily large. For example, if the controller 12's adjustment amount per unit time is 20% of the controller 12's adjustment stroke, performing correction control to maximize the drive speed of the motor 5 will result in excessive correction control, causing the control results to deviate significantly from the target temperature. As a result, it takes time for the hot air temperature supplied from the hot air dryer to stabilize at the target temperature. After a predetermined time T2 has passed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature for the hot air supplied from the hot air dryer.

When the controller 12 is rapidly decreasing, the control unit 29 switches to correction control to minimize the driving speed of the motor 5. When the controller 12 is rapidly increasing, the control unit 29 switches to correction control to maximize the driving speed of the motor 5. This control method optimizes the driving speed of the motor 5 in response to all rapid adjustment actions performed by the controller 12, thereby maintaining a constant temperature of the hot air supplied from the hot air dryer.

The reason why the motor 5 drive time T1 (when controller 12 is rapidly decreasing) and the motor 5 drive time T2 (when controller 12 is rapidly increasing) satisfy the inequality (T1 < T2) is as follows. When controller 12 is rapidly increasing, the heat output of heater 6 increases dramatically. Therefore, by increasing motor 5 drive time T2, 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 time T1 and time T2 can be (T1 < T2).

The reason why the control unit 29 controls the driving speed of the motor 5 based on normal control when the controller 12 is rapidly increased within a predetermined time T1 after the controller 12 is rapidly decreased is as follows. While the controller 12 is rapidly decreased, the control unit 29 temporarily switches to correction control to minimize the driving speed of the motor 5. However, if the controller 12 is rapidly increased before the predetermined time T1 has passed since the switch to correction control, correction control in the direction of increasing the driving speed of the motor 5 must be performed before the correction control for minimizing the driving speed of the motor 5 is completed. In this case, since the driving speed of the motor 5 is maximized, the heater 6 is likely to fall into an undershoot state. To prevent such a problem, the control unit 29 does not perform normal control based on the detection signal of the temperature sensor 25 to maximize the driving speed of the motor 5.

The reason why the control unit 29 controls the driving speed of the motor 5 based on normal control when the controller 12 is rapidly decreased within a predetermined time T2 after being rapidly increased is as follows. While the controller 12 is rapidly increased, the control unit 29 temporarily switches to correction control to maximize the driving speed of the motor 5. However, if the controller 12 is rapidly decreased before the predetermined time T2 has passed since the switch to correction control, correction control in the direction of decreasing the driving speed of the motor 5 must be performed before the correction control for increasing the driving speed of the motor 5 ends. In such a case, since the driving speed of the motor 5 is minimized, the heater 6 is likely to fall into an overshoot state. 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 driving speed of the motor 5.

The hot air temperature is detected by a plurality of temperature sensors 25 in order to improve the safety of the hot air dryer by controlling the driving states of the blower fan 4 and the heater 6 by the control unit 29 based on the detection signal of the temperature sensor 25 that detects a higher temperature.

When the operating mode is switched from cold air mode to hot air mode, if the control unit 29 switches to correction control to maximize the heat output of the heater 6 and drives it for a predetermined time T3, the hot air temperature can be rapidly increased to shorten the time it takes to return to the target temperature. Alternatively, after the predetermined time T3 has elapsed, the control unit 29 can return to normal control to maintain a constant temperature of the hot air supplied from the hot air dryer.

The relationship between heater 6's drive times T1, T2, and T3 is set to satisfy the inequality (T1 > T3 > T2) to prevent heater 6 from overshooting when returning from cold air mode to hot air mode and to accelerate the rise in hot air temperature when returning to hot air mode. Furthermore, if T1 ≤ T3 is set, the excess heat generated by heater 6's heating time is greater, making overshoot more likely. Furthermore, if T3 ≤ T2 is set, the excess heat generated by heater 6's heating time is less, resulting in a longer time for the hot air temperature to reach the target temperature when returning to hot air mode.

If the hot air mode indicators 31 to 34 and the cold air mode indicator 35 are arranged adjacent to each other, the current operation mode can be clearly determined by simply looking at the difference in the number of lit LEDs and the color of emitted light of each LED 31 to 35 .

If the mode changeover switch 9 is arranged adjacent to the plurality of hot air mode indicators 1 to 34 , the current operation mode can be clearly determined by just glancing at each of the indicators 31 to 34 .

If the cool air mode indicator 35 is arranged between the hot air mode indicators 31 to 34 and the mode changeover switch 9, the user can unambiguously confirm that the cool air mode is in effect. In particular, if the luminescent color of the cool air mode indicator 35 is made significantly different from the luminescent color of the hot air mode indicators 31 to 34, the user can confirm that the cool air mode is in effect.

If the hot air mode display bodies 31 to 34 and the cold air mode display body 35 are arranged in a straight line, it is needless to say that the current operation mode can be clearly judged by directly viewing the luminous conditions of each display body 31 to 35. By indirectly visually confirming the luminous conditions of each display body 31 to 35 projected in the mirror, there is no room for misjudgment.

If the mode changeover switch 9 and the cold air switch 13 are arranged at a position away from the housing structure, it is possible to avoid the switching error of the operation mode caused by the user's operation error or misjudgment.

If hot air mode indicators 31-34, a cold air mode indicator 35, and a mode switch 9 are provided on the main body 1, and a cold air switch 13 is provided on the handle 3, the operating mode can be switched by operating the mode switch 9 with the free hand while the handle 3 is firmly gripped with one hand. Furthermore, while the handle 3 is firmly gripped with one hand, the user can change the grip position or, while maintaining the grip, operate the cold air switch 13 with the thumb to switch to or from the cold air mode to the hot air mode. This eliminates the possibility of mistaking the mode switch 9 or the cold air switch 13, and allows for more reliable switching of the operating modes.

If temperature sensor 25 is constructed using a radial lead thermistor and is secured to terminals 26 of heater substrate 22 with a pair of lead portions 25b positioned on the front and back surfaces of heater substrate 22, heater substrate 22 can insulate the pair of lead portions 25b, thereby reliably preventing contact and short circuits between the pair of lead portions 25b. Furthermore, heater substrate 22 can firmly support the pair of lead portions 25b, reliably preventing the detection portion 25a from moving during use.

If the lead portion 25b of the temperature sensor 25 is fixed to the terminal 26 provided at the cross base of the heater substrate 22 and the detection portion 25a is made to face the heater wire 23 on the downstream side, the temperature of the hot air after being heated by contacting the heater wire 23 can be accurately detected.

In a controller 12 having a sliding variable resistor 39 and a sliding knob 40, if frictional resistance between the elastic sliding arm 45 and the resistance wall 42 acts on the reciprocating sliding knob 40, the sliding knob 40 can be held stationary at any adjustment position. Furthermore, by applying appropriate operational resistance to the sliding knob 40, excessive sliding of the sliding knob 40 can be suppressed, resulting in a smooth and clear adjustment feel.

If friction increasing portions 48 are provided on the resistance walls 42 facing both ends of the reciprocating stroke of the elastic sliding arm 45 to increase the elastic deformation of the elastic sliding arm 45, the elastic deformation of the elastic sliding arm 45 can be increased at the upper and lower ends of the reciprocating stroke of the sliding handle 40, thereby increasing the operational resistance. Thus, even when the sliding handle 40 is quickly operated, the operating portion 39a of the variable resistor 39 can be reliably prevented from impacting the end of the sliding groove 49.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart showing a control procedure of a hair dryer according to the present invention.

FIG2 is an explanatory diagram showing a schematic structure of a hair dryer according to the present invention.

FIG3 is a side view showing details of the display unit.

FIG4 is a schematic diagram of a cross section taken along line A-A in FIG2.

FIG. 5 is a block diagram schematically showing an electronic circuit of the hair dryer.

FIG. 6 is an explanatory diagram showing a switching procedure of the operation mode of the hair dryer.

FIG. 7 is a graph showing operating conditions of electrical components and a display unit in each operation mode.

FIG8 is a longitudinal sectional front view showing the detailed structure of the controller.

FIG9 is a cross-sectional view taken along line B-B in FIG8 .

FIG. 10 is a timing chart of control changes during rapid adjustment.

FIG. 11 is a flowchart showing a correction control procedure during rapid descent adjustment.

FIG. 12 is a flowchart showing a correction control procedure during rapid increase adjustment.

FIG. 13 is a timing chart of control changes during rapid adjustment.

FIG. 14 is a timing chart regarding control changes in the cool air mode.

DETAILED DESCRIPTION

(Example 1) Figures 1 to 14 show Example 1 of the hair dryer (hot air dryer) of the present invention. In addition, the so-called front and back, left and right, up and down in the present invention are displayed in accordance with the cross arrows shown in Figures 2 and 4 and the front and back, left and right, up and down marked near each arrow. In Figure 2, the hair dryer has a main body shell 1 composed of a hollow cylinder and a handle 3 that can be folded and connected relative to the main body shell 1 with an axis 2 as the center, and the shell structure of the hair dryer is composed of the main body shell 1 and the handle 3. An axial flow fan 4 for supplying dry air and a motor 5 for rotating and driving the fan 4 are arranged inside the main body shell 1, and a heater 6 is arranged on the downstream side of the fan 4. In Figure 2, symbol 52 is the suction port of the main body shell 1, and 53 is the blow-out port. As for the hair dryer in use, the air sucked in from the suction port 52 by the fan 4 is pressurized and supplied to the blow-out port 53, and is heated and hot-aired while passing through the heater 6, and is blown out from the blow-out port 53 and supplied. When the operation of the heater 6 is stopped, pressurized air at room temperature (cold air) is blown out from the air outlet 53 and supplied.

As shown in Figure 3, a mode switch 9 for switching the hair dryer's operating mode and a display unit 10 that illuminates according to each operating mode are located on the upper right side of the main housing 1. As shown in Figure 2, a main switch 11 for starting the motor 5 and heater 6 and a controller 12 for adjusting the motor 5's drive speed are located in front of the handle 3. Furthermore, a cold air switch 13 for switching the hair dryer's operating mode from hot air mode to cold air mode is located behind the handle 3. Above the heater 6 are a pair of left and right discharge electrodes 14 for generating ions, a Peltier element 15, and a heat sink 16. In Figure 2, reference numeral 17 denotes a transformer, 18 denotes a power supply/control board, and 19 denotes a temperature control board. As mentioned above, the mode switch 9 is located on the upper right side of the main housing 1, while the cold air switch 13 is located on the back of the handle 3. Positioning both switches 9 and 13 away from the housing structure is intended to prevent user error or misjudgment leading to incorrect switching of operating modes.

As shown in Figure 4, the heater 6 comprises an insulating cross-shaped heater substrate 22, a heater wire 23 spirally wound around the heater substrate 22, and an air duct 24 formed of an insulating material. Two temperature sensors 25 are arranged on the heater substrate 22. The temperature sensor 25 comprises a detection portion 25a and a radially leaded thermistor having a pair of lead portions 25b. The temperature sensor 25 is fixed to a terminal 26 of the heater substrate 22, with the pair of lead portions 25b positioned on the front and back surfaces of the heater substrate 22. In this state, the detection portion 25a, as shown in the enlarged view of Figure 4, faces the heater wire 23 on the downstream side, enabling accurate detection of the temperature of the hot air after it has been heated by contact with the heater wire 23. Furthermore, since the pair of lead portions 25b can be isolated by the heater substrate 22, short circuits caused by contact between the lead portions 25b can be reliably prevented. Furthermore, the pair of lead portions 25b can be firmly supported by the heater substrate 22, reliably preventing the detection portion 25a from moving during use. Furthermore, when the detection portion 25a is disposed facing the inside or outside of the winding region of the heater wire 23, the temperature of the hot air passing through the detection portion 25 becomes low, and thus the temperature of the hot air cannot be accurately controlled.

To control the operating states of the motor 5, heater 6, and Peltier element 15, control circuits 5C, 6C, and 15C are provided (see Figure 5). Furthermore, a control unit 29, comprised of a microcomputer, receives signals from the mode switch 9, controller 12, cold air switch 13, and temperature sensor 25, outputs operating command signals to each of the control circuits 5C, 6C, and 15C, and controls the driving states of the motor 5 (blower fan 4), heater 6, and Peltier element 15. Furthermore, the discharge electrode 14 is activated or deactivated based on the on/off operation of the main switch 11. As previously mentioned, two temperature sensors 25 are provided to enhance safety by controlling the driving states of the blower fan 4 and heater 6 via the control circuits 5C and 6C based on the detection signal from the temperature sensor 25 that detects the higher temperature.

When the main switch 11 is turned on, industrial AC current is supplied to the power supply and control board 18, regulating the current used to operate the motor 5, heater 6, discharge electrode 14, and other components. Furthermore, the control unit 29 switches the drive speed of the motor 5 based on the adjustment signal from the controller 12. When the main switch 11 is turned on, the heater 6 enters the first mode (see Figure 7), where the heating value is the highest, and hot air at 100°C is delivered from the air outlet 53. The driving current supplied to the heater 6 is pulsed, and the control unit 29 controls the pulse width and the number of pulses per unit time to adjust the heating value of the heater 6. Whenever the mode switch 9 is turned on in this state, the system switches to the second mode (90°C), the third mode (80°C), and the fourth mode (60°C), as shown in Figure 6, with hot air delivered from the air outlet at the temperatures indicated in parentheses. Furthermore, turning on the cold air switch 13 in any of the hot air modes switches the system to the fifth mode (cold air mode), deenergizing the heater 6 and delivering dry air at room temperature from the air outlet. Furthermore, in the fifth mode, if the cold air switch 13 is turned on again or the mode changeover switch 9 is operated, the mode can be switched to the hot air mode (the first to fourth modes).

To provide a light display corresponding to each of the aforementioned operating modes, a display unit 10 is provided. As shown in Figure 3, the display unit 10 is constructed by mounting four LEDs (hot air mode indicators) 31, 32, 33, and 34) and one LED (cold air mode indicator) 35 at equal intervals on a long LED substrate 30. Each LED 31, 32, 33, and 34 illuminates in accordance with each of the first through fourth operating modes. Specifically, as shown in Figure 7, in the first mode, three LEDs 31, 32, and 33 emit red light; in the second mode, two LEDs 32 and 33 emit red light; and in the third mode, one LED 33 emits red light. In the fourth mode, the previous LEDs 31, 32, and 33 stop emitting light, and LED 34 emits green light. When the cold air switch 13 is turned on to switch to the fifth mode, the rear-end LED 35 in Figure 3 illuminates blue light. Thus, the user can determine the current operating mode by the number of illuminated LEDs 31 to 35 and the difference in the color of their light. A transparent window plate 36 that covers the outer surfaces of the LEDs 31 to 35 is fixed to the main body housing 1 .

As described above, the five LEDs 31 to 35 are arranged in a straight line with adjacent LEDs 31 to 35 spaced apart at regular intervals, and the mode switch 9 is arranged along the line extending from the arrangement. In other words, the mode switch 9 is arranged adjacent to the LEDs 31 to 34 for indicating the hot air mode, and the LED 35 for indicating the cool air mode is arranged between the LEDs 31 to 34 for indicating the hot air mode and the mode switch 9.

As described above, if the LEDs 31 to 34 for displaying the hot air mode and the LED 35 for displaying the cold air mode are arranged adjacent to each other, the current operation mode can be clearly determined by just glancing at the difference in the number of lit LEDs 31 to 35 and the color of the light emitted. In addition, since the mode switching switch 9 is arranged adjacent to the LEDs 31 to 34 for displaying the hot air mode, the mode switching switch 9 can be switched while the lighting status (operation mode) of the LEDs 31 to 34 can be clearly visually confirmed, and the operation mode can be accurately switched. Furthermore, since the LED 35 for displaying the cold air mode is arranged between the LEDs 31 to 34 for displaying the hot air mode and the mode switching switch 9, and its light color is a unique blue, the user can accurately confirm that it is the cold air mode. Since the LEDs 31 to 34 for displaying the hot air mode and the LED 35 for displaying the cold air mode are arranged in a straight line, it goes without saying that the current operating mode can be clearly judged by directly observing the lighting status of each LED 31 to 35. By indirectly visually confirming the lighting status of each LED 31 to 35 projected in the mirror, there is no room for misjudgment.

As shown in Figures 8 and 9, the controller 12 includes a sliding variable resistor 39 and a sliding handle 40 mounted on the handle 3 for reciprocatingly operating the variable resistor 39 via an operating portion 39a. A guide portion 41 is recessed in the front surface of the handle 3 to guide the sliding handle 40. Resistance walls 42 are provided on the left and right sides of the inner wall of the handle 3 to apply frictional resistance to the sliding handle 40. The sliding handle 40 integrally comprises a handle body 43, which is slidably guided by the guide portion 41; a slide 44 that slides along the inner wall of the handle 3; and elastic sliding arms 45 formed on the left and right sides of the slide 44. Friction protrusions 46 are provided at the upper and lower midpoints of the elastic sliding arms 45, which move in contact with the handle body 43 while in close contact with the resistance walls 42. Furthermore, friction portions 47 are provided on the resistance walls 42, which face the reciprocating stroke of the elastic sliding arm 45, to elastically deform the elastic sliding arm 45. Friction increasing portions 48 are provided at the upper and lower ends of the friction portion 47 to increase the elastic deformation of the elastic sliding arm 45. Reference numeral 49 denotes a slide groove of the slide guide operation portion 39a.

When the variable resistor 39 is reciprocated by the sliding handle 40, the friction portion 47 elastically deforms the elastic sliding arm 45, applying frictional resistance to the sliding handle 40. This allows the operating portion 39a of the variable resistor 39 to remain stationary at any adjustment position. Furthermore, by applying appropriate resistance to the sliding handle 40, excessive sliding of the sliding handle 40 is prevented, resulting in a smooth and clear adjustment feel. At the upper and lower ends of the reciprocating stroke of the elastic sliding arm 45, the elastic deformation of the elastic sliding arm 45 is increased to increase resistance. This reliably prevents the operating portion 39a of the variable resistor 39 from impacting the end of the sliding groove 49, even when the sliding handle 40 is rapidly operated. Furthermore, the output of the variable resistor 39 is controlled by the control unit 29 to vary in magnitude only when the friction protrusion 46 is in contact with the friction portion 47. The driving speed of the motor 5 remains unchanged while the friction protrusion 46 rises from the friction portion 47 to the friction increasing portion 48 and moves toward the end of the stroke.

(Hot air mode)

To automatically adjust the air volume and temperature of the hair dryer regardless of ambient temperature fluctuations, supplying hot air at a volume and temperature suitable for various hair treatment conditions, the control unit 29 performs operational control as follows. When the main switch 11 is turned on, the control circuits 5C, 6C, and 15C receive the operation command signal from the control unit 29, activating the motor 5, heater 6, and Peltier element 15 and supplying a high-voltage discharge current to the discharge electrode 14. At this time, the heater 6 is supplied with a driving current to maximize its heat output, and the motor 5 is driven at a rotational speed corresponding to the output signal from the controller 12, maintaining the first mode. In this state, the mode selector switch 9 can be switched to change the hair dryer's operating mode between the second to fourth modes.

For example, when drying hair after washing, the hair dryer is set to the first mode to blow out and supply hot air at a high temperature (100°C). In this state, when the driving speed of the motor 5 becomes the minimum speed, the amount of hot air blown out and supplied is small. Therefore, the driving speed of the motor 5 can be increased by sliding the sliding handle 40 upward to increase the amount of hot air blown out and supplied. However, if the driving speed of the motor 5 increases, the temperature of the hot air decreases by the amount of increased air supply. To prevent such a temperature drop, the control unit 29 automatically increases the heat output of the heater 6 based on the detection signal of the temperature sensor 25 to maintain the hot air temperature at 100°C.

As described above, in Example 1, while the motor 5 and heater 6 are operating, the control unit 29 adjusts the drive speed of the motor 5 based on an adjustment signal output from the controller 12 to increase or decrease the air volume supplied by the blower fan 4. Furthermore, while the air volume supplied by the blower fan 4 is increasing or decreasing, the heat output of the heater 6 is automatically adjusted based on the detection signal from the temperature sensor 25 (steps S1 to S3 in FIG1 ), maintaining the hot air temperature constant regardless of the increase or decrease in the air volume supplied by the blower fan 4 (hereinafter referred to as normal control). The temperature of the environment in which the hair dryer is used can vary significantly depending on the season. However, even in such situations, the hot air temperature can be maintained at the target temperature of 100°C by automatically adjusting the heat output of the heater 6 based on the detection signal from the temperature sensor 25. In each of the second through fourth operating modes, the control unit 29 performs the same normal control described above to maintain the temperature of the hot air supplied from the hair dryer at the target temperature set for each operating mode.

(Slow adjustment and fast adjustment)

Depending on the user's adjustment speed of the controller 12, there are cases where the adjustment signal's adjustment speed is slower than a predetermined value (hereinafter referred to as slow adjustment) or faster than a predetermined value (hereinafter referred to as fast adjustment). The adjustment signal's adjustment speed can be determined by the voltage change per unit time across the variable resistor 39. For example, a voltage change of 5% per 0.1 second is used as a predetermined value (baseline) to determine whether slow or fast adjustment is appropriate. As shown in Figure 1, when the sliding knob 40 is adjusted slowly, the control unit 29 performs the aforementioned normal control, adjusting the hot air temperature in each operating mode to the target temperature. However, when the sliding knob 40 is adjusted quickly, the control unit 29 switches to a pre-set correction control to correct the hot air temperature after a predetermined time has passed since leaving normal control. After the predetermined time has passed, the control unit 29 returns to normal control to maintain a constant hot air temperature. Correction control forcibly changes the control state from the normal control state to a predetermined minimum output or maximum output setting, or a value close thereto. In the correction control, the control method differs depending on whether the adjustment direction of the slide knob 40 is the lowering side or the increasing side.

(Rapid decrease adjustment and rapid increase adjustment)

Rapid adjustment involves quickly operating the sliding handle 40 from an increasing position to a decreasing position (hereinafter referred to as rapid decreasing adjustment) or quickly operating the sliding handle 40 from a decreasing position to an increasing position (hereinafter referred to as rapid increasing adjustment). In either case, if the adjustment amount per unit time of the sliding handle 40 is small, the drive rotation of the blower fan 4 does not fluctuate significantly, and the control unit 29 maintains normal control. However, in the case of rapid adjustment, where the adjustment amount of the sliding handle 40 (controller 12) is greater than 50% of the adjustment stroke of the sliding handle 40 (controller 12) in the friction portion 47, the control unit 29 performs the following correction to control the heating value of the heater 6.

Specifically, as shown in Figures 1 and 10 , when the adjustment amount of the slide knob 40 reaches 50% or more of the adjustment stroke, a rapid downward adjustment ("Yes" in step S4 of Figure 1 ) occurs. Due to a sudden decrease in the drive speed of the motor 5, the air flow rate of the blower fan 4 decreases dramatically, potentially causing the heater 6 to overshoot (excessive increase). To prevent this, the control unit 29 switches from normal control to correction control (step S5 of Figure 1 ) when the adjustment amount of the slide knob 40 reaches 50% or more of the adjustment stroke, minimizing the heat output of the heater 6 (step S11 of Figure 11 ). After a predetermined time T1 (0.8 seconds), the control unit 29 returns to normal control ("Yes" in step S13 of Figure 11 ). When minimizing the heat output of the heater 6, the control unit 29 stops the drive current supplied to the heater 6 or reduces the pulse width and number of pulses per unit time of the drive current. When minimizing the heat output of the heater 6, the drive current supply is completely stopped, reducing the heat output of the heater 6 to zero ("Low"). Alternatively, the supply of the driving current is set to a value close to zero, so that the heat output of the heater 6 is close to zero, although not zero. For example, the pulse width of the driving current is reduced to close to zero the heat output of the heater 6, or the number of pulses per unit time is reduced to close to zero the heat output of the heater 6.

If the adjustment amount of the slide knob 40 is a rapid adjustment and the adjustment amount is greater than a preset value, the control unit 29 switches from normal control to correction control. The output voltage of the variable resistor 39, adjusted by the slide knob 40, varies within a range of 2V (100%) to 0V (0%). Therefore, if the output voltage of the variable resistor 39 changes by 1.0V (50%) or more and the adjustment speed of the slide knob 40, i.e., the adjustment speed of the variable resistor 39, is rapid, the control unit 29 performs the necessary correction control. Specifically, if the voltage change per unit time changes by 5% every 0.1 seconds, the control unit 29 determines that the adjustment is rapid, and further determines whether the adjustment is rapid decreasing or rapid increasing, and performs the necessary correction control. For example, if the output voltage of the variable resistor 39 is 1.9V and the slide knob 40 is rapidly adjusted, causing the output voltage to drop to 0.8V, the control unit 29 determines that the adjustment is rapid and is in a decreasing direction, and switches from normal control to correction control. In this manner, the control unit 29 determines that the adjustment is rapid and the adjustment amount satisfies the set value or more, further determines the adjustment direction (increase/decrease direction), and determines whether to switch to correction control.

The adjustment stroke of the controller 12 is proportional to the amount of change in the output voltage of the variable resistor 39. 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".

In contrast, as shown in the right half of FIG. 10 , in the case of a rapid increase in the adjustment amount of the slide knob 40, exceeding 50% of the adjustment stroke ("YES" in step S6 of FIG. 1 ), the driving speed of the motor 5 increases rapidly, causing the air flow rate of the blower fan 4 to increase dramatically, potentially causing the temperature of the heater 6 to undershoot (excessively drop). To prevent this, the control unit 29 switches from normal control to correction control (step S7 of FIG. 1 ) when the adjustment amount of the slide knob 40 exceeds 50% of the adjustment stroke, maximizing the heat output of the heater 6 (step S21 of FIG. 12 ). After a predetermined time T2 (0.55 seconds), the control unit 29 returns to normal control ("YES" in step S23 of FIG. 12 ). To maximize the heat output of the heater 6, the control unit 29 sets the drive current supplied to the heater 6 to Hi. Alternatively, the control unit 29 increases the pulse width and number of pulses per unit time of the drive current supplied to the heater 6. Specifically, to maximize the heat output of heater 6, the drive current supply is set to the Hi state to maximize the heat output of heater 6. Alternatively, the drive current supply is set to a value close to the maximum value to bring the heat output of heater 6 closer to, but not yet at, the maximum. For example, the pulse width of the drive current can be increased to bring the heat output of heater 6 closer to the Hi state, or the number of pulses per unit time can be increased to bring the heat output of heater 6 closer to the maximum.

As mentioned above, if correction control is performed when the sliding handle 40 is adjusted to be quickly lowered or quickly increased, and the driving time T1 of the heater 6 during the rapid lowering adjustment and the driving time T2 of the heater 6 during the rapid increasing adjustment are set to satisfy the inequality (T1>T2), the heater 6 can be reliably prevented from falling into overshoot or undershoot, thereby reducing the dispersion range of the hot air temperature relative to the target temperature.

Regarding the adjustment direction of the variable resistor 39 by the sliding knob 40, originally, either the upper side (increasing side) or the lower side (decreasing side) can be selected from any adjustment position. However, due to a user's operational error or misjudgment, there are cases where the sliding knob 40 is rapidly lowered and then rapidly increased within a predetermined time T1 ("Yes" in step S15 of FIG11 ). In such cases, as shown in FIG13 , when the adjustment amount of the sliding knob 40 during the rapid lowering adjustment exceeds 50% of the adjustment stroke, the control unit 29 switches from normal control to correction control. At the time when the rapid increase adjustment is determined, the control unit 29 disengages correction control and returns to normal control (step S14 of FIG11 ), and the heat output of the heater 6 is restored to the normal control state. Similarly, in the case where the sliding handle 40 is rapidly increased and then rapidly decreased within a certain time T2 ("Yes" in step S25 of Figure 12), at the time point when the adjustment amount of the sliding handle 40 during the rapid increase adjustment exceeds 50% of the adjustment stroke, the control unit 29 switches from normal control to correction control, and at the time point when the rapid decrease adjustment is determined, the control unit 29 disengages from correction control and returns to normal control, and restores the heat output of the heater 6 to the normal control state.

(Cool air mode)

When the hair dryer is operating in the normal control state of any operating mode, if the cold air switch 13 is turned on, as shown in Figures 6 and 14, the control unit 29 cuts off the power to the heater 6 and delivers dry air at room temperature from the air outlet. Thereafter, if the cold air switch 13 is turned off (turned on again), the control unit 29 switches to correction control, maximizes the heat output of the heater 6, and drives it for a predetermined time T3 (0.75 seconds). After that, the control unit 29 switches to normal control and adjusts the heat output of the heater 6 based on the detection signal of the temperature sensor 25, and returns to the hot air mode before switching to the cold air mode. For example, if the hot air mode before switching to the cold air mode was 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 disconnected and the cold air mode is restored to the hot air mode, if the correction control is switched to maximize the heat output of the heater 6 and the heater is driven for a predetermined time T3, the hot air temperature can be increased sharply and the time to restore to the target temperature can be shortened. It is set so that the relationship between the heater driving time T3 in the correction control and the predetermined times T1 and T2 in the aforementioned correction control satisfies the inequality (T1>T3>T2). For example, when T3≤T2 is set, the heat generation is less than the driving time of the heater 6, so that the time it takes for the hot air temperature to reach the target temperature when the hot air mode is restored is extended. In order to compensate for such insufficient heat generation, T3>T2 is set. In addition, when using a hair dryer, there is a case where the suction port 52 is covered by a towel or quilt, etc., so that the hot air temperature is abnormally high, for example, 120°C. In such a case, the control unit 29, which receives the output signal of the temperature sensor 25, immediately stops the operation of the motor 5 and the heater 6, and turns on or off the LEDs 31 to 34 for indicating the hot air mode and the LED 35 for indicating the cold air mode, thereby notifying the user that the hair dryer has stopped due to an abnormal state. This abnormal display state can be released by turning off the main switch 11. When the main switch 11 is turned on again, the hair dryer can operate normally. Alternatively, a separate display (LED) for abnormality indication can be provided, and the display can be turned on and off to notify the user that the hair dryer has stopped due to an abnormal state.

(Example 2) In Example 1, when the drive speed of the motor 5 is adjusted based on an adjustment signal from the controller 12, the heat output of the heater 6 is automatically adjusted based on the detection signal from the temperature sensor 25 to maintain the target temperature of the hot air. However, a configuration may be employed in which the heat output of the heater 6 is adjusted based on an adjustment signal from the controller 12 to adjust the hot air temperature. In this case, when the heat output of the heater 6 is adjusted based on an adjustment signal from the controller 12, the control unit 29 may automatically adjust the drive speed of the motor 5 based on the detection signal from the temperature sensor 25 to maintain the target temperature of the hot air. Specifically, Example 2 differs from Example 1 in that the heat output of the heater 6 is adjusted by the controller 12 and the drive speed of the motor 5 is controlled based on the detection signal from the temperature sensor 25. The remaining configuration is the same as Example 1. Furthermore, in Example 2, the control contents of the control unit 29 may be replaced with the control contents described in Example 1 by referring to the drive speed of the motor 5 and the heat output of the heater 6, and thus their description is omitted.

The hair dryer in Example 2 can be implemented as follows. A hair dryer is provided with a blower fan 4, a motor 5 for rotating and driving the blower fan 4, a heater 6 for heating the air supplied from the fan 4, and a control unit 29 for controlling the operating state of the motor 5 and the heater 6. The control unit 29 receives a detection signal from a temperature sensor 25 for detecting the temperature of the hot air heated by the heater 6 and an adjustment signal from a controller 12 for adjusting the heat output of the heater 6, and controls the driving state of the blower fan 4 and the heater 6. Furthermore, the hair dryer is characterized in that the control unit 29 is structured so that, in the operating state in which the motor 5 and the heater 6 are driven, the heat output of the heater 6 can be adjusted according to the adjustment signal output from the controller 12 to increase or decrease the temperature of the hot air. When the heat output of the heater 6 increases or decreases, the control unit 29 automatically increases or decreases the driving speed of the motor 5 based on the detection signal from the temperature sensor 25 to keep the temperature of the hot air constant.

A hair dryer equipped with the control unit 29 described above can automatically adjust the hot air temperature of the hair dryer regardless of the ambient temperature, thereby supplying hot air at a volume and temperature suitable for various hair treatment conditions. Furthermore, even when the user operates the controller 12 to adjust the air supply temperature to a desired level, the control unit 29 automatically increases or decreases the drive speed of the motor 5 based on the detection signal from the temperature sensor 25 to maintain a constant hot air temperature. This ensures that the hair can be treated accurately while consistently supplying hot air at an appropriate temperature.

Depending on the difference in the adjustment speed of the controller 12 performed by the user, there are slow adjustment, in which the adjustment speed of the adjustment signal is less than a predetermined value, and fast adjustment, in which the adjustment speed of the adjustment signal is greater than a predetermined value. When the adjustment state of the controller 12 is slow adjustment, the control unit 29 performs normal control to adjust the driving speed of the motor 5 based on the detection signal of the temperature sensor 25 to maintain a constant hot air temperature. In addition, when the adjustment state of the controller 12 is fast adjustment, the control unit 29 switches to a pre-set correction control to correct the hot air temperature before a predetermined time has passed since leaving the normal control, and returns to the normal control after the predetermined time has passed to maintain a constant hot air temperature.

As described above, normal control is performed when the controller 12 is adjusted slowly because the variation in the heat output of the heater 6 caused by the slow adjustment is small, and the adjustment action of the heater 6 can be reliably followed and the driving speed of the motor 5 can be accurately controlled through normal control. In addition, if correction control is performed when the adjustment state of the controller 12 is fast adjustment, the driving speed of the motor 5 can be appropriately controlled in a state corresponding to the adjustment action of the heater 6, so that the temperature of the hot air supplied from the hair dryer approaches the target temperature, thereby keeping the hot air temperature constant. In addition, if normal control is continued when the controller 12 is adjusted quickly, it is impossible to follow the adjustment action of the controller 12 and quickly control the driving speed of the motor 5, so that the temperature of the hot air supplied from the hair dryer deviates significantly from the target temperature.

When the controller 12 is adjusted from any adjustment position to the side where the heat output of the heater 6 decreases, when the adjustment state of the controller 12 is a rapid decrease adjustment, the control unit 29 switches to correction control to minimize the driving speed of the motor 5, and returns to normal control after a predetermined time T1.

As described above, when the controller 12 is in the rapid-descent adjustment mode, the control unit 29 switches to correction control, minimizing the drive speed of the drive motor 5 and driving it for a predetermined time T1. This allows the drive speed of the motor 5 to be reduced in response to the rapid decrease in the heat output of the heater 6. This prevents the heater 6 from undershooting. Furthermore, after the predetermined time T1 has elapsed since the start of correction control, the control unit 29 returns to normal control, maintaining a constant temperature for the hot air supplied by the blower.

In the case of a rapid descent adjustment in which the adjustment amount of the controller 12 is 50% or more of the adjustment stroke of the controller 12 , the control portion 29 switches from the normal control to the correction control, and returns to the normal control after a predetermined time T1 has elapsed.

As described above, in the case of a rapid decrease adjustment in which the adjustment amount of the controller 12 is more than 50% of the adjustment stroke of the controller 12, if the control unit 29 switches from normal control to correction control to minimize the driving speed of the motor 5, it is possible to eliminate unnecessary large adjustments to the driving rotation of the motor 5. For example, in the case where the adjustment amount of the controller 12 is 30% of the adjustment stroke of the controller 12, if correction control is performed to minimize the output of the driving rotation of the motor 5, the control for correction will become excessive, causing the control result to deviate significantly from the target temperature. As a result, it takes time for the temperature of the hot air supplied from the hair dryer to stabilize at the target temperature. The control unit 29 returns to normal control after a predetermined time T1 has passed since the correction control was started, so as to keep the temperature of the hot air supplied from the hair dryer constant.

When the controller 12 is adjusted from any adjustment position to the side where the heat output of the heater 6 increases, when the adjustment state of the controller 12 is a rapid increase adjustment, the control unit 29 switches to correction control to maximize the driving speed of the motor 5, and returns to normal control after a predetermined time T2.

As described above, when the controller 12 is in the rapid increase adjustment mode, if the control unit 29 can switch to correction control to maximize the drive speed of the motor 5 and drive it for the predetermined time T2, the drive speed of the motor 5 can be increased in response to the rapid increase in the heat output of the heater 6. This prevents the heater 6 from overshooting. Furthermore, after the predetermined time T2 has elapsed since the start of correction control, the control unit 29 returns to normal control to maintain a constant temperature of the hot air supplied from the blower.

In the case of a rapid increase adjustment in which the adjustment amount of the controller 12 exceeds 50% of the adjustment stroke of the controller 12 , the control portion 29 switches to the correction control and returns to the normal control after a predetermined time T2 has elapsed.

As described above, in the case of a rapid increase in the controller 12's adjustment amount, which is greater than 50% of the controller 12's adjustment stroke, if the control unit 29 switches from normal control to correction control to maximize the drive speed of the motor 5, it is possible to prevent the drive speed of the motor 5 from being adjusted too much. For example, if the controller 12's adjustment amount per unit time is 20% of the controller 12's adjustment stroke, then performing correction control to maximize the drive speed of the motor 5 will cause the control used for correction to become excessive, causing the control result to deviate significantly from the target temperature. As a result, it takes time for the temperature of the hot air supplied from the hair dryer to stabilize at the target temperature. After a predetermined time T2 has passed since the correction control was started, the control unit 29 returns to normal control to maintain a constant temperature of the hot air supplied from the hair dryer.

When the controller 12 is adjusted from any adjustment position to a 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 switches to correction control to minimize the drive speed of the motor 5, and returns to normal control after a predetermined time T1. When the controller 12 is adjusted from any adjustment position to a 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 switches to correction control to maximize the drive speed of the motor 5, and returns to normal control after a predetermined time T2.

As described above, when the controller 12 is rapidly decreasing, the control unit 29 switches to correction control to minimize the driving speed of the motor 5. When the controller 12 is rapidly increasing, the control unit 29 switches to correction control to maximize the driving speed of the motor 5. According to this control method, the driving speed of the motor 5 can be optimized in response to all rapid adjustment operations performed by the controller 12, thereby maintaining a constant temperature of the hot air supplied from the hair dryer.

It is assumed that the driving time T1 of the motor 5 when the adjustment state of the controller 12 is the rapid decrease adjustment and the driving time T2 of the motor 5 when the adjustment state of the controller 12 is the rapid increase adjustment satisfy the inequality (T1<T2).

As described above, the motor 5 drive time T1 when the controller 12 is rapidly decreasing and the motor 5 drive time T2 when the controller 12 is rapidly increasing are set to satisfy the inequality (T1 < T2) for the following reason. When the controller 12 is rapidly increasing, the heat output of the heater 6 increases dramatically. Therefore, by increasing the motor 5 drive time T2, 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 time T1 and time T2 can be (T1 < T2).

When the controller 12 is rapidly increased within the predetermined time T1 after being rapidly decreased, the control portion 29 controls the driving rotation speed of the motor 5 based on the normal control.

As described above, when the controller 12 is rapidly increased within a predetermined time T1 after the controller 12 is rapidly decreased, the control unit 29 controls the driving speed of the motor 5 based on normal control for the following reason. In the state where the controller 12 is rapidly decreased, the control unit 29 temporarily switches to correction control to minimize the driving speed of the motor 5. However, if the controller 12 is rapidly increased before the predetermined time T1 has passed since the switch to correction control, correction control in the direction of increasing the driving speed of the motor 5 must be performed before the correction control for minimizing the driving speed of the motor 5 is terminated. In this case, since the driving speed of the motor 5 is maximized, the heater 6 is likely to fall into an undershoot state. To prevent such a problem, the control unit 29 does not perform normal control based on the detection signal of the temperature sensor 25 to maximize the driving speed of the motor 5.

When the controller 12 is rapidly increased and then rapidly decreased within a certain time period T2, the control unit 29 controls the driving rotation speed of the motor 5 based on the normal control.

As described above, after the controller 12 is rapidly increased, it is rapidly decreased within a predetermined time T2. The reason why the control unit 29 controls the driving speed of the motor 5 based on normal control is as follows. While the controller 12 is rapidly increased, the control unit 29 temporarily switches to correction control to maximize the driving speed of the motor 5. However, if the controller 12 is rapidly decreased before the predetermined time T2 has passed since the switch to correction control, correction control must be performed in the direction of decreasing the driving speed of the motor 5 before terminating the correction control for increasing the driving speed of the motor 5. In this case, since the driving speed of the motor 5 is minimized, the heater 6 is likely to fall into an overshoot state. To prevent this problem, the control unit 29 performs normal control based on the detection signal of the temperature sensor 25 without minimizing the driving speed of the motor 5.

In the above embodiment, the controller 12 is constructed using a sliding variable resistor 39. However, this need not apply; a dial variable resistor may also be used. In the above embodiment, the blower fan 4 is described as an axial flow fan. However, this need not apply; the blower fan 4 may also be a turbofan or a multi-blade fan. Furthermore, the hair dryer need not be a handheld hair dryer; a desktop hair dryer may also be used. The term "hot air dryer" encompasses not only hair dryers but also dryers for feet, fingers, nails, and animals.

In the correction control in Example 1, the control state is forcibly changed from the normal control state to a preset minimum output setting value or a setting value close thereto during a rapid decrease adjustment, but this is not necessary. For example, the preset minimum output can also be set to half the thermal output of the Hi state. That is, the so-called minimum output is to reduce the thermal output to a preset minimum thermal output setting value or a setting value close thereto, and is not necessarily limited to zero or a value close thereto. Similarly, the control state is forcibly changed from the normal control state to a preset maximum output setting value or a setting value close thereto during a rapid increase adjustment, but this is not necessary. For example, the preset minimum output can also be set to half the thermal output of the Hi state. That is, the so-called minimum output is to increase the thermal output to a preset maximum thermal output setting value or a setting value close thereto, and is not necessarily limited to the Hi state or a value close thereto.

Explanation of symbols

1 Main body shell

3 handles

4 air supply fans

5. Electric Motor

6 Heater

9 Mode switch

10 Display unit

11 Main switch

12 Controller

13 Cold air switch

22 Heater substrate

23 heater wire

25 Temperature Sensor

29 Control Department

31～34 Hot air mode display (LED)

35 Cool air mode indicator (LED)

39 variable resistor

40 Slide handle.

Claims (31)

1. A hot air dryer, comprising a fan (4), an electric motor (5) for rotating and driving the fan (4), a heater (6) for heating air supplied from the fan (4), and a control unit (29) for controlling the operating states of the electric motor (5) and the heater (6) in a main housing (1), characterized in that, The control unit (29) receives the output signal from the temperature sensor (25) for detecting the temperature of the hot air heated by the heater (6) and the adjustment signal from the controller (12) for adjusting the drive speed of the motor (5) to control the drive state of the motor (5) and the heater (6). The control unit (29) is configured to adjust the drive speed of the motor (5) according to the adjustment signal output from the controller (12) when the motor (5) and heater (6) are driven, thereby increasing or decreasing the air volume of the blower fan (4). Furthermore, as the airflow of the blower fan (4) increases or decreases, the heat output of the heater (6) is automatically adjusted based on the detection signal from the temperature sensor (25) to keep the hot air temperature constant. Based on the difference in adjustment speed of the controller (12) performed by the user, there are slow adjustments where the adjustment speed of the adjustment signal is less than the predetermined value and fast adjustments where the adjustment speed of the adjustment signal is greater than the predetermined value. The control unit (29) is configured such that, when the controller (12) is in a slow adjustment state, it performs normal control to increase or decrease the heat output of the heater (6) based on the detection signal of the temperature sensor (25), so as to keep the hot air temperature constant. Furthermore, the controller (12) is configured such that when the adjustment state is fast adjustment, it switches to correction control to correct the hot air temperature during the period before a predetermined time has elapsed after leaving normal control, and then returns to normal control after the predetermined time has elapsed to keep the hot air temperature constant. 2. The hot air dryer according to claim 1, characterized in that, The configuration is such that when the controller (12) is adjusted from any adjustment position to the side where the drive speed of the motor (5) decreases, the adjustment state of the controller (12) is in the case of rapid decrease adjustment. The control unit (29) switches to correction control to minimize the heat output of the heater (6) and returns to normal control after a predetermined time (T1). 3. The hot air dryer according to claim 2, characterized in that, The configuration is such that, in the case of a rapid descent adjustment where the adjustment amount of the controller (12) is more than 50% of the adjustment stroke of the controller (12), The control unit (29) switches from normal control to correction control to minimize the heat output of the heater (6), and then returns to normal control after a predetermined time (T1). 4. The hot air dryer according to any one of claims 1 to 3, characterized in that, The configuration is such that when the controller (12) is adjusted from any adjustment position to the side where the drive speed of the motor (5) increases, and the adjustment state of the controller (12) is in the case of rapid increase adjustment, The control unit (29) switches to correction control to maximize the heat output of the heater (6) and drive it for a predetermined time (T2). 5. The hot air dryer according to claim 4, characterized in that, When the adjustment amount of the controller (12) is increased rapidly by more than 50% of the adjustment stroke of the controller (12), The control unit (29) switches to calibration control and then returns to normal control after a predetermined time (T2). 6. The hot air dryer according to claim 1, characterized in that, The configuration is such that when the controller (12) is adjusted from any adjustment position to the side where the drive speed of the motor (5) decreases, and the adjustment state of the controller (12) is in rapid decrease adjustment, the control unit (29) switches to correction control to minimize the heat output of the heater (6), and returns to normal control after a predetermined time (T1). Furthermore, when the controller (12) is adjusted from any adjustment position to the side where the drive speed of the motor (5) increases, and the adjustment state of the controller (12) is rapidly increasing the adjustment, the control unit (29) switches to correction control, so that the heat output of the heater (6) is maximized and then returns to normal control after a predetermined time (T2). 7. The hot air dryer according to claim 6, characterized in that, The driving time (T1) of the heater (6) when the controller (12) is in a rapidly decreasing adjustment state and the driving time (T2) of the heater (6) when the controller (12) is in a rapidly increasing adjustment state satisfy the inequality (T1 > T2). 8. The hot air dryer according to claim 4, characterized in that, The configuration is such that, after the controller (12) is rapidly reduced, and then rapidly increased within a certain time (T1), the control unit (29) controls the heat output of the heater (6) based on normal control. 9. The hot air dryer according to claim 4, characterized in that, The configuration is such that, after the controller (12) is rapidly increased and adjusted, and then the controller (12) is rapidly decreased and adjusted within a certain time (T2), the control unit (29) controls the heat output of the heater (6) based on normal control. 10. The hot air dryer according to any one of claims 1 to 3, characterized in that, The hot air dryer has two operating modes: a hot air mode in which a drive motor (5) and a heater (6) supply hot air, and a cold air mode in which only the drive motor (5) supplies cold air. Furthermore, the configuration is such that when the operating mode is switched from cold air mode to hot air mode, the control unit (29) switches to correction control to maximize the heat output of the heater (6) and drives it for a predetermined time (T3), and then switches to normal control to adjust the heat output of the heater (6) based on the detection signal of the temperature sensor (25). 11. The hot air dryer according to claim 10, characterized in that, The driving time (T1) of the heater (6) during rapid descent adjustment, the driving time (T2) of the heater (6) during rapid increase adjustment, and the driving time (T3) of the heater (6) during correction control are set to satisfy the inequality (T1 > T3 > T2). 12. The hot air dryer according to claim 10, characterized in that, A hot air mode display body (31-34) that emits light and displays in hot air mode and a cold air mode display body (35) that emits light and displays in cold air mode are provided on the outside of the main body shell (1). Furthermore, the hot air mode display body (31-34) and the cold air mode display body (35) are arranged adjacent to each other. 13. The hot air dryer according to claim 12, characterized in that, The hot air mode consists of multiple hot air modes, and each hot air mode is provided with a corresponding hot air mode display (31-34). Furthermore, a mode switching switch (9) is disposed adjacent to the hot air mode display body (31-34). 14. The hot air dryer according to claim 12 or 13, characterized in that, A cold air mode display (35) is arranged between the hot air mode display (31-34) and the mode switching switch (9). 15. The hot air dryer according to claim 12 or 13, characterized in that, The hot air mode display (31-34) and the cold air mode display (35) are arranged in a straight line. 16. The hot air dryer according to claim 10, characterized in that, The mode switching switch (9) and the cold air switch (13) for switching the hot air dryer from hot air mode to cold air mode are located away from the housing structure consisting of the main body housing (1) and the handle (3). 17. The hot air dryer according to claim 16, characterized in that, The main body housing (1) is equipped with a hot air mode display (31-34), a cold air mode display (35) and a mode switching switch (9), and the handle (3) is equipped with a cold air switch (13). 18. A hot air dryer, comprising a blower fan (4), an electric motor (5) for rotating and driving the blower fan (4), a heater (6) for heating air supplied from the blower fan (4), and a control unit (29) for controlling the operating states of the electric motor (5) and the heater (6) in a main housing (1), characterized in that, The control unit (29) receives a detection signal from a temperature sensor (25) for detecting the temperature of the hot air heated by the heater (6) and an adjustment signal from a controller (12) for adjusting the heat output of the heater (6), and controls the drive state of the blower fan (4) and the heater (6). 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) when the motor (5) and the heater (6) are driven, thereby increasing or decreasing the hot air temperature. Furthermore, the control unit (29) is configured to automatically adjust the drive speed of the motor (5) based on the detection signal from the temperature sensor (25) when the heat output of the heater (6) changes, so as to keep the hot air temperature constant. Based on the difference in adjustment speed of the controller (12) performed by the user, there are slow adjustments where the adjustment speed of the adjustment signal is less than the predetermined value and fast adjustments where the adjustment speed of the adjustment signal is greater than the predetermined value. The control unit (29) is configured such that, when the controller (12) is in a slow adjustment state, it performs normal control by adjusting the drive speed of the motor (5) based on the detection signal of the temperature sensor (25) to keep the hot air temperature constant. Furthermore, when the controller (12) is in the adjustment state of rapid adjustment, the control unit (29) switches to a preset correction control to correct the hot air temperature during a period before a predetermined time has elapsed after deviating from normal control, and then returns to normal control after a predetermined time has elapsed, so that the hot air temperature remains constant. 19. The hot air dryer according to claim 18, characterized in that, The configuration is such that when the controller (12) is adjusted from any adjustment position to the side where the heat output of the heater (6) decreases, the adjustment state of the controller (12) is in the case of rapid decrease adjustment. The control unit (29) switches to correction control to minimize the drive speed of the motor (5) and restores normal control after a predetermined time (T1). 20. The hot air dryer according to claim 19, characterized in that, The configuration is such that when the adjustment amount of the controller (12) exceeds 50% of the adjustment stroke of the controller (12) and the adjustment rapidly decreases, The control unit (29) switches from normal control to correction control and then returns to normal control after a predetermined time (T1). 21. The hot air dryer according to any one of claims 18 to 20, characterized in that, The configuration is such that when the controller (12) is adjusted from any adjustment position to the side where the heat output of the heater (6) increases, the adjustment state of the controller (12) is in the case of rapid increase adjustment. The control unit (29) switches to correction control to maximize the drive speed of the motor (5) and returns to normal control after a predetermined time (T2). 22. The hot air dryer according to claim 21, characterized in that, The configuration is such that, in the case of a rapid increase in adjustment of the controller (12) exceeding 50% of the adjustment stroke of the controller (12), The control unit (29) switches to calibration control and then returns to normal control after a predetermined time (T2). 23. The hot air dryer according to claim 18, characterized in that, The configuration is such that when the controller (12) is adjusted from any adjustment position to the side where the heat output of the heater (6) decreases, and the adjustment state of the controller (12) is in the case of rapid decrease adjustment, the control unit (29) switches to correction control, minimizes the drive speed of the motor (5), and returns to normal control after a predetermined time (T1). Furthermore, when the controller (12) is adjusted from any adjustment position to the side where the heat output of the heater (6) increases, and the adjustment state of the controller (12) is rapidly increasing adjustment, the control unit (29) switches to correction control, so that the drive speed of the motor (5) is maximized and then returns to normal control after a predetermined time (T2). 24. The hot air dryer according to claim 21, characterized in that, The driving time (T1) of the motor (5) when the controller (12) is in a rapid downward adjustment state and the driving time (T2) of the motor (5) when the controller (12) is in a rapid upward adjustment state satisfy the inequality (T1 < T2). 25. The hot air dryer according to claim 21, characterized in that, The configuration is such that, after the controller (12) is rapidly reduced, and then the controller (12) is rapidly increased within a certain time (T1), the control unit (29) controls the drive speed of the motor (5) based on normal control. 26. The hot air dryer according to claim 21, characterized in that, The configuration is such that, after the controller (12) is rapidly increased and adjusted, and then the controller (12) is rapidly decreased and adjusted within a certain time (T2), the control unit (29) controls the drive speed of the motor (5) based on normal control. 27. The hot air dryer according to claim 1 or 18, characterized in that, Multiple temperature sensors (25) are provided in the main housing (1). Based on the detection signal of the temperature sensor (25) that detects the highest temperature among multiple temperature sensors (25), the control unit (29) controls the driving state of the fan (4) and the heater (6). 28. The hot air dryer according to claim 1 or 18, characterized in that, The heater (6) consists of an insulating plate-shaped heater substrate (22) and heater wires (23) spirally wound around the heater substrate (22). The temperature sensor (25) consists of a detection section (25a) and a radial lead type thermistor with a pair of lead sections (25b). The temperature sensor (25) is fixed to the terminal (26) of the heater substrate (22) with a pair of lead portions (25b) located on the surface and back of the heater substrate (22). 29. The hot air dryer according to claim 28, characterized in that, Multiple heater substrates (22) are crossed, and heater wires (23) are spirally wound around each substrate (22). The lead portion (25b) of the temperature sensor (25) is fixed to the terminal (26) provided on the cross base of the heater substrate (22), and the detection portion (25a) is positioned facing the heater wire (23) on the downstream side. 30. The hot air dryer according to claim 28, characterized in that, The controller (12) includes a sliding variable resistor (39) and a sliding handle (40) mounted on the handle (3) for reciprocating operation of the variable resistor (39). The handle (3) is provided with a guide part (41) for sliding guide of the sliding handle (40) and a resistance wall (42) for applying frictional resistance to the sliding handle (40). The sliding handle (40) has a handle body (43) slidably guided by a guide portion (41) and an elastic sliding arm (45) that slides against a resistance wall (42). The frictional resistance between the elastic sliding arm (45) and the resistance wall (42) is applied to the reciprocating sliding handle (40) to apply operating resistance to the sliding handle (40). 31. The hot air dryer according to claim 30, characterized in that, Friction-increasing portions (48) are provided on the resistance walls (42) at both ends of the reciprocating stroke facing the elastic sliding arm (45) to increase the amount of elastic deformation of the elastic sliding arm (45).