JP2003189925A - Hair drier provided with negative ion generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hair drier provided with a negative ion generating device which generates sufficient quantity of ions substantially without causing increase of weight or volume of the drier, and which, therefore, can be lightly operated in any place. <P>SOLUTION: In a case of this drier 1, an ion generating circuit part 6 and a negative ion generating electrode 7 are disposed. The ion generating circuit part 6 comprises a rectifier part 23 to change an alternating power voltage received from an external AC power source into a DC, a primary side AC generating circuit 36 to switch the DC input voltage from the rectifier part to generate a primary side AC of a frequency of 40-500 kHz, a piezoelectric transformer 70 to convert the primary side AC into a secondary side AC voltage at 1,000-6,000 V to be outputted from an output side terminal toward an ion generating electrode, and a converting means 40 to convert the secondary side AC output of the piezoelectric transformer 70 so that voltage application polarity to the ion generating electrode 7 is dominant on the negative side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hair dryer with a negative ion generator.

[0002]

2. Description of the Related Art Conventionally, negative ion generators have been used to purify, sterilize or deodorize the air in a room or an automobile. Negative ions are said to be more effective in purification, deodorization or sterilization than positive ions, and have recently been installed in various electric devices such as air purifiers and air conditioners, and have been attracting attention.

As one field of application of such a negative ion generator, there is a hair dryer as disclosed in Japanese Utility Model Publication No. 58-16323, Utility Model Registration No. 2534856 or Japanese Patent Laid-Open No. 9-350. That is,
Negative ions generated from the ion generating electrode are mixed with the warm air blown from the dryer and sprayed on the hair. Its effects include reducing the electrostatic charge on the hair, protecting the hair and papillae, and the moisturizing effect peculiar to negative ions allows the moist feeling to be retained for a relatively long time even after drying with a dryer.
There are also commercially available products that are gaining popularity mainly among women.

[0004]

When an ion generator is mounted on a hair dryer, it is necessary to incorporate a high-voltage generating circuit, which is indispensable for generating ions, into the housing of the dryer. However, in the dryer disclosed in the above publication, the high voltage is generated by using the winding transformer. Since the winding transformer has a large iron core, the weight and the volume increase, so that the storage place becomes a problem. 58-
In the configuration of Japanese Patent No. 16323 or Japanese Patent Laid-Open No. 9-350 (particularly in FIG. 1), the dryer main body and the high voltage generating unit are separated, and a box-shaped high voltage generating unit is incorporated in the middle of the power cord. However, in such a structure, the high-voltage generating unit is an obstacle to the operability, and it cannot be practically used unless there is a space for mounting the high-voltage generating unit on the floor or a table. There will also be restrictions on the place of use.

On the other hand, Japanese Utility Model Registration No. 2534856 or Japanese Patent Laid-Open No. 9-350 (particularly FIG. 12 thereof) discloses a structure in which a winding transformer is incorporated in the dryer body. However, with this structure, the weight of the dryer main body is significantly increased because the winding transformer is incorporated, and the light operability when the hair dryer is held in the hand to dry the hair is significantly impaired. Also,
In Japanese Utility Model Registration No. 2534856, it is not possible to read the installation position of the winding transformer specifically, but Japanese Patent Application Laid-Open No. 9-350 discloses that a transformer is installed in the handle portion of the dryer. However, if a transformer is installed in the handle part, the thickness of the handle part will increase abnormally, making it difficult to hold and support with the palm (especially for women with small hands). There is an easy problem.

In all of the publications, the frequency of the received commercial alternating current is increased by using an oscillation circuit and then input to the transformer, whereby the winding ratio of the transformer is reduced and the device is downsized. . However, in a winding transformer that uses an iron core, if the AC frequency is raised too high,
Since the inductance of the coil and the loss due to the eddy current of the iron core become large, there is a limit to the frequency that can be used, and the desired size reduction effect cannot be obtained. On the other hand, if the step-up ratio is reduced in order to reduce the size of the transformer, the high voltage required for ion generation cannot be obtained, which results in a fall of the end of life.

The object of the present invention is to provide a negative ion generator which causes almost no increase in the weight or volume of the dryer, is capable of generating sufficient ions, and can be operated lightly and has no restrictions on the place of use. To provide a hair dryer.

[0008]

In order to solve the above problems, a hair dryer with an ion generator according to the present invention comprises a casing having a ventilation path having a blowout port formed at its end, and a casing. A resistance heating heater assembly for heating warm air, which is placed on the ventilation path inside the body and generates heat by energizing with the AC power supply voltage received from the external AC power supply, and operates with the AC power supply voltage received from the external AC power supply. A blower that sends an air flow to the path, and an ion generation electrode that is arranged in the housing so as to mix negative ions into the warm air that is blown out from the air outlet,
An ion generating circuit unit that is arranged in the housing and applies a high voltage to the ion generating electrode so that the voltage application polarity is dominant on the negative side, and generates negative ions from the ion generating electrode. The generating circuit unit is a rectifying unit that converts an AC power source voltage received from an external AC power source into a DC current, and a DC input voltage from the rectifying unit is switched to generate a primary side AC having a frequency of 40 to 500 kHz. An alternating current generation circuit and an input side terminal and an output side terminal are formed on the ceramic element plate, and the primary side alternating current input to the input side terminal is more than the primary side alternating voltage via mechanical vibration of the piezoelectric ceramic element plate. A piezoelectric transformer that converts to a high-voltage secondary side alternating voltage of 1000 to 6000 V and outputs it from the output side terminal to the ion generating electrode, and the polarity of voltage application to the ion generating electrode is negative. As a dominant on the side, and having conversion means for converting the secondary side AC output of the piezoelectric transformer, the.

In the above structure, a piezoelectric transformer is used in place of the conventional winding transformer for the booster for generating a high voltage for ion generation. The piezoelectric transformer is 40 to 500 because the piezoelectric ceramic, which is a medium for generating high voltage, is insulating.
It can be driven at a high frequency of kHz, and is much lighter and smaller than a winding transformer,
It is possible to generate a high voltage of 6000 V, which is sufficient for generating negative ions. In addition, it is advantageous in terms of structure to have no iron core or winding portion in terms of compactness and weight reduction.
Therefore, even when incorporated in a hair dryer, the weight and volume of the main body portion hardly increase. as a result,
Despite the built-in ion generator, the dryer is easy to hold and light, so even if you use it for a long time, you will not get tired. Further, unlike the above-mentioned prior art publication, since a large high pressure generating portion is not externally attached, there is no restriction on the place of use.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an appearance of an example of a hair dryer with an ion generator (hereinafter, also simply referred to as a dryer) 1 as one embodiment of the present invention, and FIG. 2 shows an internal structure thereof. The dryer 1 has a housing 102 having an air blowing path 115 having an air outlet 103a formed at the end. The housing 102 is a blower 110
In order to accommodate a main body 102M that accommodates the main body 102M, a handle portion 102H that is integrated with the main body 102M and that is used to hold and operate the dryer 1, and a resistance heating heater assembly 130 that extends from the main body 102M, Cylindrical cover 1 fixed to the main body 102M with bolts 103d
03, and the air outlet 1 at the tip of its cover 103.
03a is open. A protector grill 106 is fitted in the air outlet 103a. Also,
The main body 102M is formed with an intake port 107 for taking in outside air. The housing 102 is made of plastic and is molded by being divided into two injection molded bodies 102a and 102b. The injection-molded bodies 102a and 102b are fitted to each other at the mating surfaces as shown in FIG. 4, and the bolts 120 are inserted into the plurality of bolt holes formed by the bolt guide protrusions 102X and 102Y, respectively, and the nut 12 is formed.
It is assembled by tightening 1. The cover 103 is made of a resin having higher heat resistance than the main body 102M. In this embodiment, the main body 102M is made of ABS resin,
The cover 103 is made of polycarbonate resin.

A blower path 115 for guiding the wind from the blower 110 toward the air outlet 103a is formed in the housing 102, and a resistance heating heater assembly 130 is arranged in the blower path 115. As shown in FIG. 3, the resistance heating heater assembly 130 includes an insulating core 13 in which two mica plates are combined in a cross-shaped shape.
1 and resistance heating metal wires (for example, nichrome wire) 2 and 3 that are spirally wound around the insulating core 131. As shown in FIG. 2, the resistance heating metal wires 2 and 3 are connected to independent switches SW1 and SW2 by power supply wirings 2a and 3a. The power supply wiring 4a of the motor 4 is connected to another switch SW0. All of these switches SW0 to SW2 are exposed on the side surface of the grip portion 102H and can be easily operated by a finger holding the grip portion 102H. These power supply wirings 2a, 3a, 4a are integrated into one power cord 104 after passing through the switches SW0 to SW2, and a commercial alternating current (AC10 in the present embodiment) as an external alternating current power source is provided at the tip thereof.
It is set to 0V, but is not limited to this and can be selected in the range of 80 to 240V depending on the country or region). A power plug 105 is attached.

As shown in FIG. 2, the blower 110 is housed in the main body 102M in order to send the airflow to the blower path 115 in the housing 102. On the other hand, the housing 10
An ion generating electrode 7 is arranged inside 2 so as to mix the negative ions with the warm air blown out from the air blowing port 103a. Then, in the housing 102, the ion generation circuit unit 6 that generates a negative ion from the ion generation electrode 7 by applying a high voltage to the ion generation electrode so that the voltage application polarity is dominant on the negative side. It is arranged.

FIG. 7 is a circuit diagram showing a configuration example of the ion generating circuit section 6. The ion generating circuit section 6 is a power plug 1
In order to convert the alternating-current power supply voltage received from the commercial alternating-current outlet via 05 into a direct current, a rectifying unit 23 including a diode bridge for full-wave rectification is provided. The pulsating flow waveform that is full-wave rectified by the rectifying unit 23 is smoothed by the capacitor 24. Reference numeral 29 is a varistor for surge suppression. The ground (GND) in the circuit diagram is connected to the ground electrode formed on the substrate 6a, and this ground electrode is connected to the power supply ground terminal of AC100V via the current limiting resistor 49.

The DC input voltage from the rectifying unit 23 is switched to a primary side AC having a frequency of 40 to 500 kHz by switching in the primary side AC generating circuit 36. This primary side alternating current is boosted by the piezoelectric transformer 70. In the piezoelectric transformer 70, an input side electrode pair 72, 73 and an output side electrode 74 are formed on a piezoelectric ceramic element plate 71, and an input side terminal 72a and an output side terminal 74a are connected to each other. Then, the primary side alternating current is input to the input side terminal 72a. Then, through mechanical vibration of the piezoelectric ceramic element plate 71, a voltage higher than the primary side AC voltage is 1000 to 600.
The secondary side alternating voltage of 0V is converted and output from the output side terminal 74 toward the ion generating electrode 7. The secondary side AC output of the piezoelectric transformer 70 is converted by the converting means 40 so that the polarity of voltage application to the ion generating electrode 7 is dominant on the negative side.

As the material of the piezoelectric ceramic element 71, for example, lead zirconate titanate-based perovskite type piezoelectric ceramic (so-called PZT) can be used. This is mainly composed of a solid solution of lead zirconate and lead titanate, and is excellent in impedance conversion efficiency, and therefore can be suitably used in the present invention. The lead zirconate / lead titanate compounding ratio is preferably about 0.8 to 1.3 in terms of the lead zirconate / lead titanate molar ratio in order to achieve good impedance conversion efficiency. . If necessary, part of zirconium or titanium may be replaced with Ni, N
It can also be replaced with b, Mg, Co, Mn or the like.

In the piezoelectric ceramic element, when the driving frequency becomes extremely high, the resonance sharpness sharply becomes dull and the conversion efficiency is lowered. Therefore, the frequency of the primary side AC input is 40%.
It is desirable to set to a value corresponding to the mechanical resonance frequency of the element 71 in a slightly lower frequency range of about 500 kHz (preferably 50 to 200 kHz). Conversely, it is desirable to determine the dimensions of the element 71 so that the mechanical resonance frequency of the element 71 falls within the above frequency range. Further, the voltage level of the primary side AC input is set to about 15 to 50 V described above from the viewpoint of ensuring the generation efficiency of negative ions and ensuring the durability of the element. Thereby, the voltage level applied to the ion generating electrode 7 is 1000 to 600 at maximum in the frequency range of the primary side AC input.
About 0 V (desirably 2000 to 5000 V) can be secured.

The primary side AC generating circuit 36 has an oscillating circuit 37. The oscillating circuit 37 has a square wave oscillating comparator 62 using an operational amplifier IC and oscillates a square wave at a frequency (40 to 500 kHz) corresponding to the primary side alternating current. Then, the DC input voltage formed by the rectifying unit 23 is switched at the frequency of the oscillation by the switching circuit 38 that operates by receiving the waveform signal from the oscillation circuit 37, and the square wave becomes the primary side AC. AC is generated. This circuit configuration is a compact one mainly composed of an operational amplifier IC, and has a far smaller number of parts as compared with, for example, the resonance circuit disclosed in Japanese Utility Model Registration No. 2534856, and the casing of the dryer 1. It can be easily and effortlessly incorporated into the body,
It also results in little weight and volume increase.

The switching circuit 38 includes a comparator 6
It is composed of push-pull switching transistors 65, 66 which receive the square wave output of 2 and perform a switching operation. Then, the oscillating circuit 37 specifically rectifies the reference voltage input to the positive terminal of the comparator 62.
3, a reference voltage generating circuit 39 that is generated based on the DC input voltage from the circuit 3, a negative feedback path 51 that returns a part of the square wave output of the switching circuit 38 to the negative terminal of the comparator 62, and a feedback resistor 52 provided on the negative feedback path 51. And the comparator 62
Integration capacitor 53 connected to the negative terminal of the feedback resistor 52 with a time constant corresponding to the oscillation frequency to be obtained.
Including and Negative feedback of the oscillation output of the switching circuit 38 enables more stable and accurate oscillation,
It can be fully utilized as the primary side AC frequency of a piezoelectric transformer with a relatively narrow operating frequency range. Reference voltage generation circuit 39
In the present embodiment, the DC input voltage is divided by the voltage dividing resistors 54, 5
It is generated in the form of step-down voltage by 5. Further, in this embodiment, since the comparator 62 is composed of the unipolar operational amplifier IC, the pullup resistor 43 for making the drive inputs of the push-pull switching transistors 65 and 66 bipolar is provided. Type operational amplifier I
When C is used, the pull-up resistor 43 is unnecessary. However, the unipolar operational amplifier IC is inexpensive, requires a small number of peripheral elements, has a simple upper wiring, and does not consume much mounting area. Therefore, it can be said that it is more convenient to utilize a small space in the housing 103 of the dryer 1 to incorporate a circuit for ion generation.

A square wave alternating current is generated by the operation of the switching section 38, and this generates an adjusting resistor 67 (a variable resistor 67a for adjusting the waveform) at the input side terminal 72a of the piezoelectric transformer 70.
Is included as a primary side AC input. The piezoelectric transformer 70 boosts the voltage according to the above-mentioned operating principle and outputs it as the secondary side AC output from the output side terminal 74a. Reference numeral 69 is an LC filter for absorbing radio waves.

Next, the rectifying section 40 includes a diode 76 forming a rectifying circuit. The diode 76 allows the charge transfer in the direction in which the ion generation electrode 7 is charged up to the negative polarity, and rectifies the secondary side AC output of the piezoelectric transformer 70 so as to prevent the charge transfer in the opposite direction. Fulfill. In the present embodiment, a plurality (here, two) of diodes 76 are connected in series in order to secure the withstand voltage. When the secondary side of the piezoelectric transformer 70 outputs a negative half wave, the ion generating electrode 7 is negatively charged. As a result, an electric field gradient convenient for negative ion generation is generated around the ion generating electrode 7, and molecules in the surrounding air, for example, water molecules are ionized in the form of hydroxyl ions or the like. That is, negative ions are generated. Next, when the positive half wave is output, the negative charges of the ion generating electrode 7 try to discharge to the ground side, but the flow of this charge is blocked by the diode 76. Thus, the negatively charged state of the ion generating electrode 7 is always maintained, and negative ions can be constantly generated.

A path 75 for returning the secondary side AC output of the piezoelectric transformer 70 to the oscillating section (oscillating circuit) 37.
A feedback capacitance is provided on a. In order to stabilize the operation of the piezoelectric transformer 70, it is necessary to maintain the drive frequency in a relatively narrow range centered on the resonance frequency of the piezoelectric ceramic element plate 71. Providing the feedback capacitance as described above is effective in stabilizing the drive frequency of the piezoelectric transformer 70.

In this embodiment, as shown in FIG. 7C, the piezoelectric transformer 70 is attached to the insulating substrate 6a so that the piezoelectric ceramic element plate 71 and the substrate surface are substantially parallel to each other. Then, a region corresponding to the piezoelectric ceramic element plate 71 on the back surface side of the insulating substrate is covered with the metal film electrode 75, and the metal film electrode 75 and the piezoelectric ceramic element plate 71 both serve as the insulating substrate 6a. It forms the feedback capacitance with the part located between the two.

Next, the external AC power source is 80-
It is a commercial alternating current of a relatively high voltage of 240 V, which is too high in the drive specification of the piezoelectric transformer 70 as it is, and it is necessary to step down this to the input voltage level of the primary side alternating current of the piezoelectric transformer 70 set to 15 to 50 V. . If this step-down is performed by using a winding transformer or a step-down circuit, it is obviously inconvenient for the purpose of the present invention to downsize the ion generating circuit for the dryer. Therefore, in the present embodiment, as shown in FIG. 6, an ion generating circuit drop resistor 8 for performing the step-down is provided. In the present embodiment, the ion generating circuit drop resistor 8 is placed in the front stage of the rectifying unit 23 (FIG. 7) that full-wave rectifies the power receiving input from the external AC power source, but it may be provided in the rear stage. For example, it may be provided on the substrate 6a of the ion generating circuit unit 6. The ion generating circuit unit 6 can be made more compact by adopting a configuration in which the external AC power supply is stepped down by one drop resistor.

If the resistance value of the ion generating circuit drop resistor 8 fluctuates due to heat from the heater assembly 130, the input voltage of the piezoelectric transformer also fluctuates and stable operation is impaired. This must be prevented. . Therefore, in the present embodiment, the ion generating circuit drop resistor 8
Is externally attached to the input terminal of the board 6a, for example,
The resistance heating heater assembly 130 is separated from the resistance heating heater assembly 130, and is provided upstream of the resistance heating heater assembly 130 on the air blowing path 115. Further, for the same purpose, the circuit board 6a of the ion generating circuit unit 6 is also provided on the air flow path 115 on the upstream side of the resistance heating heater assembly 130.

Next, as shown in FIG.
Is an AC motor 4 driven by an external AC power supply voltage
And a cylindrical sirocco fan 11 that is directly connected to the output shaft 4S of the AC motor 4 and is arranged on the outer side of the outer peripheral surface 4j of the motor body with a gap G formed therebetween.
0a and. The circuit board 6a of the ion generating circuit section 6 is arranged in the gap G. That is, by using the piezoelectric transformer, the size of the substrate of the ion generating circuit section 6 can be dramatically reduced, and the sirocco fan 110a and the outer peripheral surface 4 of the main body of the motor 4 that drives the sirocco fan 110a.
The ion generation circuit section 6 can be incorporated by utilizing a small space (gap G) between the ion generation circuit section 6 and the j.
As a result, it is possible to apply a sufficient voltage drop to the ion generating electrode 7 due to the large step-up ratio of the piezoelectric transformer, and the size and weight of the hair drier 1 with an ion generating device are not particularly required to have an ion generating function. It is possible to maintain it at almost the same level as the dryer. In the present embodiment, the sirocco fan 110a is coupled to the hub 110c by the spoke-shaped coupling portions 110b, and the hub 110c is attached to the output shaft 4S of the AC motor 4 using the bolt 111. In the present embodiment, as shown in FIG.
The main body 102M is accommodated in a motor accommodation portion 102c (a communication hole 108 for communicating with the outside air is formed in the bottom portion) in which the bottom center is bulged in a concave shape.
It is supported in a suspended state by the bottom of the main body 102M via 23.

As shown in FIG. 6, switches SW1 and SW
2 is a resistance heating heater assembly 130 to the AC motor 4
Heater switches SW1 and SW that turn on / off independently of
2, a motor drop resistor 5 made of a resistance metal wire for reducing the external AC power supply voltage to the drive voltage of the AC motor 4 is incorporated in the resistance heating heater assembly 130. Unlike the ion generation circuit unit 6, the motor 4 has a high energization current value. Therefore, when the voltage is dropped by using the motor drop resistor 5, heat generation becomes relatively large. Therefore, the motor drop resistor 5 is replaced with the resistance heating heater assembly 1
Incorporation into 30 has the advantage that the heat generated can be diverted to raise the temperature of warm air. Further, since the motor drop resistor 5 is separated from the ion generation circuit unit 6, the temperature rise of the ion generation circuit unit 6 is prevented and the piezoelectric transformer 70 can be operated more stably.

The operation of the dryer 1 will be described below with reference to FIG. That is, when the power plug 105 is inserted into a commercial AC outlet and the switch SW0 is turned ON, AC is supplied to the ion generating circuit unit 6 shown in FIG. 7 through the ion generating circuit unit drop resistor 8, and as described above, the circuit is supplied. The part 6 operates and negative ions are generated from the ion generating electrode 7. On the other hand, the supplied alternating current is supplied to the alternating current motor 4 via the motor drop resistor 5, and the blower 11
0 rotates. As a result, an air flow (cold air) containing negative ions is blown out from the air blowing port 103a via the air blowing path 115. Since the blower 110 is energized through the diode D1, it is driven by only an AC half-wave, and the output is half that in full-wave driving. In this state,
When the switch SW1 is turned on, only the heater 2 is energized by alternating current to generate heat, and the airflow is heated to become warm air.

On the other hand, when the switch SW1 is turned off and the switch SW2 is turned on, only the heater 2 is energized with an alternating current to generate heat. Since the wiring of the heater 3 and the motor 4 is connected by the bypass line BP, the switch SW2
When the switch is turned on, the diode D1 is bypassed, and the blower 1
Energization of 10 is performed by full-wave alternating current. As a result, S
The motor 4 rotates with a doubled output when only W1 is turned on, and a strong wind is blown out. In this mode, heat is generated only by the heater 3, so the air temperature does not rise so much. Therefore, when both the switches SW1 and SW2 are turned on, the heat generated by the heater 2 is added thereto, and the high temperature air is blown out by the strong air. As is clear from the circuit, when the switch SW0 is OFF, the heaters 2 and 3 do not generate heat even when the switches SW1 and SW2 are ON, and the motor 4 does not rotate.

Here, as described above, the conversion means 40 of FIG. 7 is a diode 76 for half-wave rectifying the secondary output from the piezoelectric transformer 70 and applying a negative pulsating current to the ion generating electrode. ing. The frequency of this pulsating flow corresponds to the drive frequency of the piezoelectric transformer 70, and is 40 to 500 kH.
It is about z. By the way, it is known that ozone is generated when silent discharge is performed in the air. When ozone is excessively generated, an unpleasant irritating odor becomes strong, and when it is exposed to hot air, it may even damage the hair. In this case, the generation of ozone becomes particularly remarkable when the applied voltage is a high frequency wave whose polarity changes alternately. When a winding type transformer is used, the number of windings on the secondary side is increased due to the generation of high voltage, and the level of the leakage magnetic field that changes alternately according to the AC frequency becomes high. Then, when the ion generating electrode is placed in this leakage magnetic field,
Ozone generation may be promoted by the influence of the high frequency induction current generated in the ion generating electrode. However, in the present invention, since the piezoelectric transformer having no winding is used, it is possible to reduce the level of the leakage magnetic field sensed by the ion generating electrode, which is advantageous for suppressing ozone generation.

[0030] With the configuration of the present invention, for example, the generation amount of the negative ions in a position away 1m from the wind outlet 103a, 10 million pieces / cm ² or more 2,000,000 / cm ²
It can be: The amount of generated ions of 100,000 / cm ² or more can significantly enhance the brushing property after drying the hair and the moisturizing feeling (so-called moist feeling). However, by making the ion generator incorporated in the dryer 1 compact, 2 million pieces / cm
It is considered that about ² is the upper limit.

In this embodiment, the ion generating electrode 7 is arranged on the air blowing path 115. Specifically, it is attached together with the substrate 6a in the gap G inside the sirocco fan 110 (the inside of the sirocco fan 110 also forms a part of the air blowing path 115 because an airflow is generated by the intake of the outside air. I reckon). In this way, the ventilation path 115
By providing the ion generating electrode 7 on top, most of the generated ions can be mixed in the air flow, and the number of generated ions can be increased. As shown by the broken line in FIG. 2, the ion generating electrode 7 can be arranged at the same position as the resistance heating heater assembly 130 or at the downstream side thereof. Accordingly, compared with the case where the ion generating electrode 7 is provided on the upstream side of the resistance heating heater assembly 130,
The number of generated ions can be further increased.

In the above embodiment, the cover 103 covering the periphery of the heater assembly 130 is made of a resin having a heat resistance higher than that of the main body 102M, but as shown in FIG. A metal heat insulating cylinder 135 may be arranged between the heater assembly 130 and the heater assembly 130 to suppress the temperature rise of the cover 103 due to the heat generation of the heater assembly 130. In this case, the cover 103 can be made of the same resin as the main body 102M. In FIG. 8, the main body 102 and the cover 103 are integrally molded of the same resin (for example, ABS resin), and can be manufactured at a lower cost.

The metal heat insulating tube 135 as described above is used.
When the heat shield cylinder 135 is electrically isolated from the heater assembly 130 around the heater assembly 130, the heat shield cylinder 135 is easily charged by negative ions contained in the air flow. When this charging becomes severe, the number of negative ions emitted from the blowout port 103a sharply decreases, and the effect of the present invention cannot be sufficiently achieved. In order to prevent such a problem, when the heat insulating cylinder 135 made of metal is provided, it is desirable to ground it. FIG. 9 shows a circuit configuration example in which the heat insulating cylinder 135 is grounded. In this example, the ion generation circuit unit 6
In addition to the AC power receiving terminals 1 and 2 (2 is connected to the power supply ground terminal via the drop resistor 8), the connector CN1 forming a power receiving portion is provided with the connection terminal 3 of the heat insulating cylinder 135,
By connecting the connection terminal 3 to the ground electrode of the substrate 6a, the heat insulating cylinder 135 connected to the connection terminal 3 is grounded.

[0034]

EXAMPLE The dryer 1 described with reference to FIGS.
Gross weight 540g, cross-sectional area of the handle portion 102H is 12cm
^It was manufactured so as to be ² . A dryer using a winding transformer instead of the piezoelectric transformer was also created. The primary side input section of the boosting section is configured by the series resonance circuit disclosed in Japanese Utility Model Registration No. 2534856 (oscillation frequency 50
(0 Hz) was not so large as to fit inside the sirocco fan, so it was housed in the handle portion 102H together with the winding transformer. Then, the cross-sectional area of the grip 102H is increased to 20 cm ² , and the total dryer weight is 80 cm ^2.
I jumped up to 0g. Therefore, when the dryer is used for a long time, the hands become very tired.

Next, in the dryer of the present invention, the driving frequency of the piezoelectric transformer was set to 105 kHz, and various secondary output voltages (1000 to 3300 V) were obtained by changing the design value of the drop resistance on the ion generating circuit side. So that
The ion generator was driven (for comparison, driving conditions were set so that the ion generator was not operated). In addition,
The ion generating electrode 7 has a resistance heating heater assembly 130.
Two types were prepared, one arranged on the upstream side and the one arranged on the downstream side. On the other hand, in the dryer using the winding transformer, the secondary side output voltage was set to 3600 V, but the oscillation frequency was 500 Hz.

Using these dryers, the amount of negative ions generated per cm ^{3 was} measured by a commercially available ion counter (supplier: Japan MJP Co., product name: air ion counter, N) at a position 1 m away from the air outlet 103a.
o. IC-1000), the amount of generated ions under each condition was as shown in Table 1.

Then, the following tests were carried out under the above respective conditions. Brushing test: A questionnaire is conducted on 10 female models regarding the feeling of use when washing the hair with a commercially available hair brush after washing the hair with a dryer. There is no discomfort such as getting caught in hair or clinging to the hair, and the model has the feeling that it can be brushed smoothly, 9 or more people are excellent (◎), 6 to 8 people are good (○), 3 to 5 Acceptable for people (△), bad for less than 2 people (×)
Was judged as. Moisturizing test: 10 female models were dried with a dryer for 5 minutes and then allowed to relax for 1 hour in a room air-conditioned at a humidity of 50% RH and a temperature of 20 ° C., and then brushed again. Conduct a questionnaire regarding the moisturizing feeling (moist feeling) of hair. The model that had a sufficient moisturizing feeling and felt moist was excellent (◎) for 9 or more people, good (○) for 6 to 8 people, acceptable for 3 to 5 people (△), and poor for 2 people or less. It was judged as (x). Itching and dandruff prevention effect confirmation test: Male model 10
Have a person jog for 1 hour and then take a bath. However, the hair is not washed, and after the bath, brushing is performed for 5 minutes while applying warm air with a dryer. Repeat this cycle for 3 days without washing hair and check the number of people who have itching or dandruff on their heads. The number of people who did not have dandruff or itching was excellent when it was 9 or more (◎), 6-
Eight persons were judged to be good (◯), 3 to 5 persons were acceptable (Δ), and 2 or less were judged to be bad (×). The above results are shown in Table 1.

[0038]

[Table 1]

By adopting the dryer of the present invention, a sufficient amount of negative ions can be generated, and each of the brushing property, the moisturizing feeling and the itch / dandruff prevention,
It can be seen that good results are obtained.

[Brief description of drawings]

FIG. 1 is an external side view and a front view showing an example of a dryer with an ion generator of the present invention.

FIG. 2 is a side sectional view showing the internal structure of FIG.

FIG. 3 is a front view showing a configuration example of the resistance heating heater assembly of FIG.

FIG. 4 is a front view showing an example of an assembly structure of a housing.

5 is a sectional view taken along line AA and BB of FIG.

FIG. 6 is a diagram showing an example of a circuit of the dryer of FIG.

FIG. 7 is a diagram showing an example of the ion generating circuit section.

8 is a side sectional view showing a modified example of the dryer of FIG. 1 provided with a heat insulating cylinder.

FIG. 9 is a diagram showing an example of a circuit configuration for grounding the heat insulating cylinder.

[Explanation of symbols]

1 Dryer with ion generator 6 Ion generation circuit 7 Ion generation electrode 23 Rectifier 36 Primary side AC generator 40 Converting means (rectifying section) 70 Piezoelectric transformer 102 housing 103a Wind outlet 110 blower 115 Blower route 130 resistance heating heater assembly

Claims (10)

[Claims] 1. A housing having an air blowing path formed with an air blowing port at an end, and warm air heating disposed on the air blowing path in the housing and energized and heated by an AC power supply voltage received from an external AC power supply. Resistance heating heater assembly, a blower that is operated by an AC power supply voltage received from the external AC power supply, and sends an air flow to the air blowing path in the housing, and is disposed in the housing and blown out from the air outlet. An ion generating electrode arranged so as to mix negative ions into the warm air, and a high voltage is applied to the ion generating electrode so as to be arranged in the casing and the voltage application polarity is dominant on the negative side. And an ion generation circuit section for generating negative ions from the ion generation electrode, wherein the ion generation circuit section receives an AC power supply voltage received from the external AC power supply. A rectification unit that converts to direct current, a primary side AC generation circuit that generates a primary side AC with a frequency of 40 to 500 kHz by switching a DC input voltage from the rectification unit, an input side terminal and an output on the piezoelectric ceramic element plate. Side terminal is formed, and the primary side alternating current input to the input side terminal is a secondary side alternating voltage of 1000 to 6000 V which is higher than the primary side alternating voltage via mechanical vibration of the piezoelectric ceramic element plate. And a piezoelectric transformer that outputs to the ion generating electrode from the output side terminal, and a secondary side AC of the piezoelectric transformer so that the polarity of voltage applied to the ion generating electrode is dominant on the negative side. A hair dryer with a negative ion generator, comprising: a converting unit that converts an output. 2. The primary side AC generation circuit has a square wave oscillation comparator using an operational amplifier IC, and an oscillation circuit that oscillates a square wave at a frequency corresponding to the primary side AC, and a waveform from the oscillation circuit. The hair dryer with a negative ion generator according to claim 1, further comprising a switching circuit that receives a signal and switches the DC input voltage at a frequency of the oscillation. 3. The reference voltage generating circuit for generating a reference voltage input to the positive terminal of the comparator based on the DC input voltage from the rectifying unit, and the square wave output of the comparator. The output of the push-pull switching transistor forming the switching circuit, which performs the switching operation, is connected to the feedback resistor provided on the negative feedback path for returning to the negative terminal of the comparator and the negative terminal of the comparator, and has an oscillation frequency to be obtained. The hair dryer with a negative ion generator according to claim 2, comprising an integrating capacitor coupled to the feedback resistor with a corresponding time constant. 4. The ion generating circuit, wherein the external AC power supply is commercial AC of 80 to 240 V, and the external AC power supply voltage is stepped down to the input voltage level of the primary side AC of the piezoelectric transformer set to 15 to 50 V. A hair dryer with a negative ion generator according to any one of claims 1 to 3, further comprising a drop resistor for use. 5. The ion generating circuit drop resistor comprises:
The hair dryer with a negative ion generator according to claim 4, which is separated from the resistance heating heater assembly and is provided upstream of the resistance heating heater assembly on the air blowing path. 6. The negative ion generation according to claim 1, wherein the circuit board of the ion generation circuit section is provided on the air flow path upstream of the resistance heating heater assembly. Hair dryer with device. 7. The blower has a shape in which a gap is formed between an AC motor driven by the external AC power supply voltage and an output shaft of the AC motor, and a gap is formed between the outer peripheral surface of the motor body and the outside thereof. 7. The hair dryer with a negative ion generator according to claim 6, further comprising: a cylindrical sirocco fan disposed in the space, and the circuit board disposed in the gap. 8. The conversion means is a diode that half-wave rectifies the secondary output from the piezoelectric transformer and applies a negative pulsating current to the ion generating electrode.
A hair dryer with a negative ion generator according to any one of 1. 9. The amount of negative ions generated at a position 1 m away from the air outlet is 100,000 / cm ² or more and 200 or more.
9. The number of cells / cm ² is not more than 10,000 / cm ^2.
A hair dryer with a negative ion generator according to the item. 10. The hair dryer with a negative ion generator according to claim 1, wherein the ion generating electrode is arranged on the air passage.