JPH02174803A - Hair drying device - Google Patents

Abstract

PURPOSE:To make it possible to stably treat hair by heating, by a method wherein phase control is applied to electric power supplied to a heater by a switching device and a temperature at which the heater generates heat can be manually varied. CONSTITUTION:When a switch contact 49 is in the off position by fully turning a dial 17 counterclockwise, electricity is not charged in a condenser 45, and hence, since a switching element 41 is continued in the off state, heat is not generated by a heater 6 and cool air is blown off from an outlet 4. At this time, when the dial 17 for adjusting an air temperature blown is turned clockwise a little, the switch contact 49 is turned on at the same time and the electricity is begun to be charged into the condenser 45 through a variable resistor 46. When a charged voltage in the condenser 45 is beyond an on-voltage of a generating element 43 for a trigger signal, an electric current is applied to a gate of the switching element 41 and the switching element 41 is intermittently turned on, and then the phase-controlled electric power is supplied to the heater 6. In this manner, the electric power supplied to the heater 6 is continuously varied from 300 to 1200 watts by a changeover switch 16 being operated together with the variable resistor 46.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is applicable to hair dryers or hair curlers.
The present invention relates to an apparatus for subjecting hair to a predetermined heat treatment, and in particular to an apparatus in which the phase of electric power is controlled to change the heat generation temperature.

[Prior Art] Conventionally, it is widely known that the phase of a commercial AC voltage is controlled by a switching element such as a thyristor, and the electric power supplied to a heater is made variable so that the heat generation temperature can be changed manually.

Furthermore, many of these phase control circuits utilize a charging/discharging circuit using a variable resistor and a capacitor.

[Problems to be Solved by the Invention] However, when trying to implement the above-mentioned control circuit with a simple configuration such as a charging/discharging circuit, control tends to become unstable during a short conduction time of the switching element. In other words, even though the temperature setting is the same, the actual power supplied to the heater varies depending on whether the temperature setting is lowered while the power is on or when the main switch is turned on and off while maintaining the setting state. This was an inconvenience. Particularly in the case of devices such as hair dryers that require hot air to be blown directly onto the human body, such variations in set temperature pose a serious problem, such as increasing discomfort during use.

The present invention has been made in view of the above-mentioned disadvantages, and an object of the present invention is to provide an apparatus that can perform hair heat treatment as stably as possible without causing discomfort to the user.

Furthermore, the present invention has a simple configuration, and ensures reliable control range regulation in one place.
1. It is an object of the present invention to provide a curling hair treatment device i'/.

[Means for Solving the Problems] As shown in FIG. 1(a), the hair treatment device according to the present invention controls the phase of the electric power supplied to the heater 6 using a switching means such as a SIRISK. It is equipped with a control circuit 20 that allows the temperature of the heat generated to be changed manually.

In such a hair treatment device, as shown in FIG.
li! A lower limit value A is set in the power control range of the 1917 circuit 20, and the power supply to the heater 6 is forcibly stopped and increased below the lower limit value A.

As the control circuit 20, it is possible to adjust the timing for controlling the phase of the electric power supplied to the heater 6 by changing the time constant of a charging/discharging circuit 470 including a variable resistor 46 and a capacitor 45. The variable resistor 46 is equipped with a switch that turns on and off in conjunction with the increase/decrease operation of the resistance value, and when the resistance value of the variable resistor W46 exceeds a predetermined value, the switch contact 49 stops the charging/discharging operation of the charging/discharging circuit 47. It is preferable that the configuration is possible.

[Operation] In the configuration described above, in the manually adjustable range of the control circuit 20 between A' and 13', the power supplied to the heater 6 is continuously changed, and the temperature of the heat generated corresponds to the supplied power. Here, if an attempt is made to adjust the power supplied to the heater 6 below the preset lower limit value A, the power supply to the heater 6 is forcibly cut off.

When phase control in the control circuit 20 is performed using the charging/discharging circuit 47, when the resistance value of the variable resistor 1s46 exceeds a predetermined value, the switch contact 49 cuts off the power to the charging/discharging circuit 47 to stop charging. The discharging operation is forcibly stopped, and the energization of the heater 6 is stopped.

[Example] The present invention will be specifically explained below based on an example in which the present invention is implemented in a hair dryer not shown in FIGS. 2 and 3. It goes without saying that hair treatment devices of various configurations with n can also be implemented in a substantially concave shape.

As shown in FIG. 2, the hair dryer embodying the present invention has the dryer main body 1 and the stand 2 rotatably connected to each other at the # portion 3, so that when the stand 2 is placed on a desk or the like, It is a stationary type that allows you to set the direction of the air blown out from the air outlet 14 at the tip of the dryer body to any direction.

The dryer main body l has a heat generating part 8 in which a heater 6 and a thermostat 7 are connected in series inside a main body case 5 in the shape of a flat rectangular tube long in the front-rear direction, and a blower part equipped with a fan 9 and a motor 10 on the outlet 4 side. By storing and disposing the air blowers 11 on the proximal end side, it is possible to blow air from the air blowing part 11 toward the heat generating part 8 and to blow out air at a predetermined temperature from the air outlet 4.

The placing stand 2 has a storage chamber 14 between the upper and lower plates 12 and 13 in the shape of an elongated disk.
The rd storage compartment 14 houses the electric circuit shown in FIG. 3 that drives the heat generating section 8 and the blower section 11, while the upper surface has a section for manually setting various settings of the electric circuit. A main switch 15, a wind speed selector switch 16, and a dial for changing the air temperature]7 are installed, and a storage compartment 1 is also installed.
A power cord 18 for supplying commercial AC power to the electric circuit is wrapped around 1. I am in a good position to do so.

As shown in FIG. The power is applied to the power control circuit 20 and the display circuit 21 at the same time, so that the operation as a dryer is started.

The blower circuit 19 rectifies the input AC voltage with a diode bridge 22 and drives the DC motor 1° to rotate, and the wind speed can be set to three levels: weak, medium, and strong by switching the changeover switch 1G. It is a 4J winnow that can be changed into stages.

That is, the first and second contacts 23 of the changeover switch 16
・When both 24 are turned off, diode 2
The voltage half-wave rectified by 5 is further stepped down by resistors 26 and 27, and therefore, the effective voltage applied to the motor 10 is low, so the motor 10 rotates at a low speed, and the air flow from the blower 14 is low A with a relatively small air volume. is blown out.

Next, a first contact 23 is connected in parallel to the diode 25 described above.
is connected, and when the first contact 23 is turned on, the diode 25 is bypassed and the commercial AC voltage is directly supplied to the blower circuit 19. As a result, if J:9 is also high for the motor 10. Voltage is applied and it rotates at high speed, blowing out 1
Medium-speed wind blows out from Ko4.

Further, the second contact 24 of the changeover switch 16 is connected in parallel to both ends of the step-down resistor 26 via a resistor 30 and a light emitting diode 33 connected in parallel.
When the contact 24 is turned on, the values of the step-down resistors 26 and 27 are substantially reduced, and the voltage applied to the diode bridge 22 increases, increasing the voltage applied to the motor 10.
The motor 10 rotates at a higher speed and a strong wind is blown out.

The switching state of the wind speed by the changeover switch 1G described above can be adjusted by increasing or decreasing the number of lighting of the first to third light emitting diodes 31, 32, and 33 arranged around the changeover switch 16 on the upper plate 12 of the stand. It is displayed like a monkey.

That is, the first and second light emitting diodes 31 and 32 are connected in parallel in opposite directions, connected to the cathode side of the diode 25 via the protective resistor 34, and the third light emitting diode 3
3 is connected in series with the second contact 24 of the changeover switch 16 via a protective resistor 35. Therefore, when the wind is weak, only the first light emitting diode P3 is selectively illuminated by the half-wave voltage rectified by the diode 25. When the first contact 23 is turned on, the first light emitting diode 3I is turned on. In addition, current also flows through the 2'A photodiode 1'' 32, which lights up to indicate the medium-speed wind condition.Furthermore, when the second contact 24 is closed to create a strong wind condition, the current supplied to the blower circuit 19 causes the The three light emitting diodes 33 are also energized, and the first to third light emitting diodes 33 are energized.
The light emitting diodes 31, 32, and 33 are all lit to indicate that there is a strong wind.

The power consumption of the heater 6 is 1200 W when the commercial AC power is directly applied, and 600 W when the power is applied through the diode 25. Furthermore, the power supplied to the heater 6 is controlled by the control circuit 20. It is configured to change continuously.

The control circuit 20 for power supplied to the heater 6 includes a switching element 41 in series with the heater 6 that is bidirectional and capable of phase control, such as a triac, and a trigger circuit in series with the gate terminal 42 of the switching element 41. A signal generating element 43 and a current limiting resistor 44 are connected. A charging/discharging circuit 47 is constructed by connecting the trigger signal generating element 43 to the east in parallel with a capacitor 45 via the gate 42 of the switching element 41, and connecting a variable resistor r546 in series with the capacitor 45.

The present invention is characterized by the configuration of the charging/discharging circuit 47. That is, the variable resistor 46 is equipped with a switch 48, and one unit is installed on the upper plate 1 for changing the resistance value of the variable resistor S46.
The switch contact 49 is set to be automatically turned off at the preset upper limit position of the resistance value as the resistance value is increased by rotating the dial 17 placed in the center position of the switch counterclockwise. .

Further, the resistance value immediately before the switch contact 49 is turned off is made to match the upper limit value allowed for stable phase control of the switching element 4, for example, 600 W when 12 OOW is supplied, and 300 W when 600 W is supplied. At the same time, the switch contact 49 is connected in series with the variable resistor 4G.

Therefore, if the switch contact 49 is turned off by turning the dial 17 counterclockwise, the capacitor 45 will not be charged, and the switching element 4 will remain in the off state and the heater 6 will not generate heat and the air outlet will be closed. Cold air is blown out from 4.

At this point, when the air temperature adjustment dial 17 is slightly turned to the right, the switch contact 49 is turned on with a sense of moderation, and charging of the capacitor l15 is started via the variable resistor 4G. When the charging voltage of the capacitor 45 exceeds the on-voltage of the trigger signal generating element 43, current is passed through the gate of the switching element 41, the switching element 41 is intermittently turned on, and phase-controlled power is supplied to the heater 6. . Therefore, the power supplied to the heater 6 is continuously changed between 300W and 1200W in conjunction with the operation of the changeover switch 1G and the variable resistor 46.

By the way, immediately after the switch contact 49 is turned on, the IIL resistance value of the variable resistor 46 is relatively large, the charging time constant of the charging/discharging circuit 47 is also large, and the conduction period of the switching element 41 is also short, so that the power is The control itself tends to be unstable. However, since the resistance value at this time is set in advance to a value sufficient to perform stable control, the main switch 15 is pressed while the temperature is set at the low temperature position.
Even after repeated on/off operations, stable power control is achieved.

Note that the capacitor 5 connected in parallel with the diode 25
1 and the resistor 52 are connected to the first contact 23 of the changeover switch 16.
Diode 25 absorbs the voltage generated when the switch is turned off.
It is for protection. Further, a capacitor 53 provided in parallel with the energizing circuit of the heater 6 is used to prevent shoe noise generated during phase control, and a fuse 54 is turned off when the capacitor 53 is short-circuited to prevent excessive current It' from flowing. Furthermore, if the air volume of the thermostat 7 connected in series with the heater 6 decreases abnormally for some reason, the heater 6
When the temperature generated by the device rises above a predetermined value, it automatically turns off and stops energizing. Further, if the temperature control of the thermostat 7 becomes defective, the temperature fuse 55 forcibly cuts off the power supply to the entire circuit to prevent accidents caused by abnormal heat generation. In addition, the air blower circuit 19
The filter 56 and choke coil 57 prevent power control from malfunctioning due to noise output from the motor IO.

FIG. 4 (J is another embodiment of the electric circuit; in this embodiment, the light emitting diode 61 is turned on via the switch contact 60, which is turned on when the temperature control dial is in the OFF position, and the heater is turned on. 6 is cut off and temperature control is no longer possible.

Furthermore, in addition to the switch 62 for switching the power supplied to the heat generating section 8 into two levels, strong and weak, a switch 63 for rapidly increasing the scenery y1 is provided. In this case, the switch 63 is of a two-circuit, two-contact type, with a contact 64 shorting the voltage drop resistor 26 supplied to the blower circuit 19, and a light emitting diode 3.
A contact point 65 for regulating the timing of energization to 3 is provided individually.

The interposed position of the switch contact 49, which turns on and off in conjunction with the temperature change operation by the variable resistor 4G, may be changed as appropriate, such as on the gate 42 side of the switching element 4J or connected in series with the heater 6. can.

[Effect of the Invention J] As described above, the present invention is configured to forcibly stop energizing the heater 6 in the lower limit range where the phase control of the power supplied to the heater 6 tends to become unstable. The non-heating state and the heating temperature control state are clearly separated, and the hair can be heated as stably as possible without causing discomfort to the user.

Furthermore, a charging/discharging circuit 47 using a variable resistor 46 with a switch is used in the control circuit 20, and a switch contact 49 is used to stop the charging/discharging operation of the charging/discharging circuit 47 to forcibly stop power control. This configuration has the advantage of being able to provide reliable power ff1II9Il with a relatively simple configuration.

[Brief explanation of the drawing]

FIG. 1(a) is a schematic diagram showing the basic configuration of the present invention.
Figure (b) is an explanatory diagram showing the control state. 2 and 3 show an example in which the present invention is implemented in a hair dryer, FIG. 2 is a perspective view showing the external shape, and FIG. 3 is an electric circuit diagram. FIG. 4 is an electrical circuit diagram showing another embodiment. 6... Heater, lO... Motor, 16... Changeover switch, 20... Control circuit, 21... Display circuit, 45... Capacitor, 46... Variable resistor, 47...・・Charge/discharge circuit, 48・ ・・Switch, 49・ ・・Switch contact. Inventor Tou! 1 Jigetsu 2Φ
power j; lice snoring

Claims (1)

[Scope of Claims] 1. In a hair treatment device equipped with a control circuit in which the phase of power supplied to the heater is controlled by a switching means and the heat generation temperature can be manually changed, the power control range of the control circuit has a lower limit. A hair treatment device characterized in that a value is set and power supply to the heater is forcibly stopped when the value is equal to or less than the lower limit value. 2. Adjust the timing of the phase control of the power supplied to the heater (6) using the variable resistor (46) and capacitor (45).
In the hair treatment device that performs hair treatment by changing the charging time constant of a charging/discharging circuit (47), the variable resistor (46) is equipped with a switch that turns on and off in conjunction with an operation to increase or decrease the resistance value, When the resistance value of the variable resistor (46) exceeds a predetermined value, the switch contact (49)
2. The hair treatment device according to claim 1, wherein the charging/discharging operation of the charging/discharging circuit (47) can be stopped at the step (47).