JP2023034833A - hair iron - Google Patents

Abstract

To provide a hair iron capable of arranging a hair style excellently without damaging hair.SOLUTION: A hair iron includes arm parts 13A, 13B extending from a base end part 12. The arm parts 13A, 13B include a surface plate 42, a carbon-containing heat conduction layer 43 spread along the rear face of the surface plate 42, and a heat generator 44 arranged on the reverse side of the carbon-containing heat conduction layer 43.SELECTED DRAWING: Figure 11

Description

The present invention relates to hair irons.

Conventionally, curling irons used for arranging hairstyles are known. For example, a hair iron described in Patent Document 1 below includes a pair of iron pieces that are connected so as to be openable and closable. The user holds the hair between a pair of iron pieces, applies heat to the hair, and arranges the hairstyle.

Japanese Patent Application Laid-Open No. 2020-150999

There is a demand for hair irons such as those described above for arranging hairstyles well without damaging the hair.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a curling iron capable of arranging a good hairstyle without damaging the hair.

The hair iron of the present invention includes an arm portion extending from a base end portion, the arm portion comprising a surface plate, a carbon-containing thermally conductive layer extending along the back surface of the surface plate, and the carbon-containing thermally conductive layer. and a heating element arranged on the back side of the.

According to the present invention, the heat of the heating element is transmitted in the surface direction of the surface plate by the carbon-containing thermally conductive layer, so the temperature of the surface plate can be easily made uniform. Further, since far infrared rays are generated by the carbon-containing heat conductive layer, it is possible to heat the deep part of the hair while suppressing thermal damage to the surface of the hair. Therefore, the hairstyle can be well arranged without damaging the hair.

The perspective view which shows the hair iron in a present Example. Longitudinal sectional view showing a curling iron in an open state Partially enlarged perspective view showing the vicinity of the switch Enlarged longitudinal sectional view showing part of the proximal end in the locked state FIG. 4 is an enlarged cross-sectional plan view showing a part of the proximal end portion with the locking member arranged at the locking position; Enlarged cross-sectional plan view showing a portion of the proximal end portion with the lock member disposed at the unlocked position Partially cutaway perspective view showing the lock portion in the locked state Partial cutaway perspective view showing the lock part in the unlocked state Longitudinal cross-sectional view showing the clamping part of the upper arm part A plan view of the clamping portion of the upper arm as seen from below An exploded perspective view showing a clamping portion of the upper arm portion Flowchart showing processing when a power supply device is connected to a curling iron Table showing the configuration of the conical coil spring of the comparative example The figure which shows the structure of the conical coil spring of a comparative example. Table showing the calculation results of the load and deflection of the conical coil spring of the comparative example Graph showing the load-deflection curve of the conical coil spring of the comparative example

Preferred embodiments of the present invention are shown below.

In the hair iron of the present invention, the carbon-containing heat conductive layer may contain a graphite sheet. According to such a configuration, the carbon-containing thermally conductive layer can be made thin, and the hair iron can be miniaturized. In addition, since the surface temperature of the surface plate can be made uniform, uneven protein denaturation of hair due to local temperature rise can be prevented.

Moreover, in the hair iron of the present invention, the carbon-containing heat conductive layer may be flexible. With such a configuration, the carbon-containing thermally conductive layer does not crack and can be easily handled.

Moreover, in the hair iron of the present invention, the heating element may include a film heater. According to such a configuration, the thickness of the heating element can be reduced and the size of the arm portion can be reduced. The heat of the film heater spreads in the planar direction from the heater wire through the carbon-containing thermally conductive layer. Therefore, the temperature of the surface plate can be made uniform in the surface direction while downsizing the arm portion.

Moreover, the hair iron of the present invention may have a battery housing portion for housing a battery, and may be operated by electric power from the battery. According to such a configuration, it can be used in a place where there is no outlet, so it can be easily used as a portable device.

Further, the hair iron of the present invention has a USB cable insertion port, is freely connectable to a power supply device via the USB cable, and when the output of the power supply device is higher than a predetermined value, the electric power from the power supply device is used. It may operate with power from the battery when the output of the power supply device is lower than a predetermined value. According to such a configuration, when a power supply device with an output higher than a predetermined value is connected, the power supply operates on the power of the power supply device, so the battery can be used for a long time, and the battery can be used even if the battery is not charged. can. When a power supply device with an output lower than a predetermined value is connected, it operates with electric power from the battery, so it is possible to prevent deterioration in performance due to insufficient output.

<Example>
An embodiment embodying the present invention will be described in detail below with reference to FIGS. 1 to 16. FIG. The hair iron 10 in this embodiment is used for arranging hairstyles. The hair iron 10 is a straightener, and has a pair of arm portions 13A and 13B connected at a base end portion 12 as shown in FIG. The hair iron 10 opens a pair of arm parts 13A and 13B, pinches the hair between them, applies heat to the hair, and arranges the hairstyle. When the hair iron 10 is not used, the pair of arm portions 13A and 13B are closed.

Hereinafter, in the hair iron 10, a state in which the pair of arm portions 13A and 13B are opened is referred to as an open state, and a state in which the pair of arm portions 13A and 13B are closed is referred to as a closed state. In the description of each component, the positive direction side of the Y axis in FIG. The tip side of the arm portions 13A and 13B) is the front side, and the negative direction side of the X axis (the side where the base end portion 12 is provided) is the rear side. The X-axis direction indicates the front-rear direction or length direction, the Y-axis direction indicates the vertical direction or thickness direction, and the Z-axis direction indicates the left-right direction or width direction. In the description of each of the arm portions 13A and 13B, the side facing each other of the pair of arm portions 13A and 13B is the inside or front side, and the side opposite to the side facing each other is the outside or back side.

The display portion 14 is provided on the outer surface of the upper arm portion 13A. The display unit 14 has an LED, for example. On/off of the power supply, set temperature, charging state, and the like are displayed on the display unit 14 .

The hair iron 10 includes a holding portion 15 for holding hair and a holding portion 16 held by a user. The holding portion 15 is a portion on the front side of the hair iron 10 . The grip portion 16 is a rear portion of the hair iron 10 . The length dimension, width dimension and thickness dimension of the clamping portion 15 in the closed state are smaller than the length dimension, width dimension and thickness dimension of the grip portion 16 .

The hair iron 10 has a cap case 17. - 特許庁The cap case 17 covers the clamping portion 15 in the closed state from the front.

The hair iron 10 has a comb-like portion 18. - 特許庁The comb-shaped portions 18 are provided on both left and right sides of the holding portion 15 . The comb-like portion 18 is formed along the left and right edges of a housing 24, which will be described later, over substantially the entire length of the holding portion 15 (see FIG. 10). The comb-shaped portion 18 has a plurality of projections 19 arranged in the front-rear direction. Each protrusion 19 has a triangular shape with a pointed protruding end side, and is arranged at equal intervals. By providing the comb 18, the surface area of the housing 24 can be increased to facilitate efficient heat dissipation and reduce the temperature of the housing 24. FIG.

The hair iron 10 has an insertion port 22 for a USB cable 21. - 特許庁The insertion port 22 is compatible with USB Type-C. The insertion port 22 is provided at the base end portion 12 of the upper arm portion 13A and opens rearward. The hair iron 10 is connected via a USB cable 21 to a power supply device (not shown). A power supply device conforming to the USB PD (Power Delivery) standard can be used.

As shown in FIG. 2, the pair of arm portions 13A and 13B can be displaced between an open state and a closed state around a hinge portion 23 provided at the proximal end portion 12. As shown in FIG. FIG. 2 shows the curling iron 10 in an open state. Each of the pair of arm portions 13A and 13B linearly extends forward from the base end portion 12 .

Each arm portion 13A, 13B has a housing 24 elongated in the front-rear direction. Inside the housing 24, components constituting the hair iron 10 are accommodated. The cross-section of the housing 24 is arcuately curved as shown in FIG. Both left and right edges of the housing 24 are located on the front side of the central portion of the housing 24 in the left-right direction.

The housing 24 has, as shown in FIG. 2, a battery containing portion 26 for containing the battery 25 . The battery 25 is a rechargeable secondary battery such as a lithium ion battery. The battery 25 is charged by connecting a power supply device via the USB cable 21 . The hair iron 10 operates with power supplied from the battery 25 .

The battery housing portion 26 is provided in the grip portion 16 of the lower arm portion 13B. The front side of the battery containing portion 26 is closed by a battery cover 27 . Battery cover 27 is detachable. By removing the battery cover 27, the battery 25 can be put in and taken out of the battery housing portion 26. - 特許庁

The hair iron 10, as shown in FIG. 3, has a switch 28 for switching between on/off of the power source and setting temperature of the heating element 44, which will be described later. The switch 28 is provided on the inner surface of the upper arm portion 13A. By providing the switch 28 on the inner surface of the upper arm portion 13A, erroneous operation can be prevented more than when it is provided on the outer surface. The switch 28 is slidable in the front-rear direction. The power off position of switch 28 is rearward of the power on position. FIG. 3 shows the switch 28 in the power on position. When the holding portion 15 is covered with the cap case 17, the switch 28 in the power-on position is pushed rearward by the pressing portion 17A provided on the cap case 17 and moves to the power-off position.

As shown in FIG. 4, the proximal end portion 12 has a locking portion 30 that holds the pair of arm portions 13A and 13B in a closed state. The lock portion 30 has a first lock portion 31 provided on the upper side and a second lock portion 32 provided on the lower side. The first lock portion 31 and the second lock portion 32 come into contact with each other when the pair of arm portions 13A and 13B are about to be displaced from the closed state to the open state, and suppress further displacement.

The first lock portion 31 protrudes downward from the housing 24 of the upper arm portion 13A.

The second lock portion 32 is provided on a lock member 33 held by the lower arm portion 13B. The lock member 33 swings left and right about the rotating shaft portion 33A between a lock position (see FIG. 5) and an unlock position (see FIG. 6). In FIGS. 5 and 6, a line in which the first lock portion 31 is projected downward is shown by an imaginary line.

The lock member 33 includes a body portion 34 and an operation portion 35, as shown in FIG. The body portion 34 has a plate shape. The second lock portion 32 protrudes upward from the body portion 34 . The body portion 34 has a lock holding portion 36 that holds the position of the lock member 33 . The lock holding portion 36 is a recess formed on the back surface of the body portion 34 . The lock holding portion 36 fits into a projection portion 37 provided on the lower arm portion 13B. The protrusion 37 is elastically displaced in the vertical direction by the spring member 38 . The elastic force of the spring member 38 acts in a direction to move the protrusion 37 upward.

A pair of left and right lock holding portions 36 are provided. As shown in FIG. 5, the locking member 33 is held at the locked position by fitting the left lock holding portion 36 to the protrusion 37 . As shown in FIG. 6 , the lock member 33 is held at the unlocked position by fitting the right lock holding portion 36 to the protrusion 37 .

The operating portion 35 is provided so as to protrude from the rear surface of the main body portion 34 . The operating portion 35 protrudes rearward from the housing 24 . By moving the operating portion 35 left and right, the position of the second locking portion 32 can be changed to the locked position or the unlocked position. At this time, the user can obtain a click feeling due to the elastic displacement of the protrusion 37 .

Contact surfaces 31A and 32A between the first lock portion 31 and the second lock portion 32 are inclined surfaces as shown in FIG. When the contact surfaces 31A and 32A hit each other in the vertical direction, a force is generated at the contact surfaces 31A and 32A to push the second lock portion 32 in the unlocking direction (leftward in FIG. 7). When the force pushing the second lock portion 32 in the unlocking direction becomes larger than the force displacing the protrusion 37 downward, the lock holding portion 36 is separated from the protrusion 37, and the lock member 33 moves to the unlock position ( See Figure 8).

The holding portion 15 of the upper arm portion 13A and the holding portion 15 of the lower arm portion 13B have substantially the same configuration. Here, the configuration of the clamping portion 15 of the upper arm portion 13A will be described, and the configuration of the clamping portion 15 of the lower arm portion 13B will be omitted.

Each of the holding portions 15 of the upper and lower arm portions 13A and 13B includes a plate 40 and an elastic member 41, as shown in FIG.

As shown in FIG. 10, the plate 40 has a generally rectangular plate shape that is elongated in the front-rear direction as a whole. The surface of the plate 40 has a length dimension of 60 mm and a width dimension of 12 mm. As shown in FIG. 11, the plate 40 includes, in order from the front side, a surface plate 42, a carbon-containing thermally conductive layer 43, a heating element 44, a thermally conductive layer 45, a temperature sensor 46, an elastic sheet 47, an insulating sheet 48, and a pressing member 49. , a thermal fuse 51 and a bracket 52 .

The surface plate 42 has a substantially rectangular plate shape elongated in the front-rear direction. The face plate 42 forms a contact surface that contacts the hair. A plurality of holes 53 are formed through the surface plate 42 in the front-back direction. The holes 53 are arranged at equal pitches in the longitudinal direction of the surface plate 42 . The front side of the surface plate 42 is covered with a low-friction sheet. The face plate 42 has a peripheral wall 54 along its outer periphery. The peripheral wall 54 surrounds the outer peripheral sides of the carbon-containing thermally conductive layer 43 , the heating element 44 , the thermally conductive layer 45 , the elastic sheet 47 , the insulating sheet 48 and the pressing member 49 . The peripheral wall 54 has a plurality of projecting pieces 54A projecting to the rear side. The projecting piece 54A guides the displacement of the plate 40 in the front-back direction with respect to the housing 24. As shown in FIG.

Carbon-containing thermally conductive layer 43 is composed of a graphite sheet. The carbon-containing thermally conductive layer 43 has a rectangular shape elongated in the front-rear direction and has the same size as the rear surface of the surface plate 42 . The thickness dimension of the carbon-containing thermally conductive layer 43 is uniform. The carbon-containing thermally conductive layer 43 is in the form of a thin sheet and has flexibility. Since the carbon-containing thermally conductive layer 43 has flexibility, it is difficult to crack even if it is thin. Due to the thinness of the carbon-containing thermally conductive layer 43, the space inside the housing 24 can be effectively used. Since the carbon-containing thermally conductive layer 43 is composed of the graphite sheet, the surface temperature of the surface plate 42 can be made uniform. As a result, uneven protein denaturation of hair due to localized temperature rise can be made less likely to occur.

The carbon-containing thermally conductive layer 43 contains a large amount of carbon and has a thermal conductivity higher than that of metal. A carbon-containing thermally conductive layer 43 is sandwiched between the surface plate 42 and the heating element 44 . By providing the carbon-containing thermally conductive layer 43 with high thermal conductivity between the surface plate 42 and the heating element 44 , the heat of the heating element 44 is quickly transferred to the surface plate 42 . In addition, the heat of the heating element 44 is quickly transmitted in the surface direction of the carbon-containing thermally conductive layer 43 to uniformly raise the temperature of the entire surface plate 42 . The carbon-containing heat conductive layer 43 emits far infrared rays by heat. Far infrared rays are radiated to the hair through the holes 53 of the surface plate 42 .

The heating element 44 is a planar heating element having flexibility. The heating element 44 is composed of a film heater in which a heater wire (not shown) is arranged on an insulating film. The heater wires are arranged over the entire surface of the film. The heating element 44 has a substantially rectangular shape elongated in the front-rear direction. The heating element 44 is thin and lightweight. Electrodes are provided on both front and rear ends of the heating element 44 . The electrodes are fixed to the back surface of the pressing member 49 (see FIG. 9).

The heat-conducting layer 45 is made of metal foil (for example, aluminum foil) or the like with high heat conductivity. The heat conductive layer 45 has a substantially rectangular shape elongated in the front-rear direction, and spreads thinly over the entire back surface of the heating element 44 . The heat conductive layer 45 is attached to the back surface of the heating element 44 . The heat conductive layer 45 efficiently transfers the temperature of the heating element 44 to the temperature sensor 46 . The thermally conductive layer 45 and the carbon-containing thermally conductive layer 43 have approximately the same size.

The temperature sensor 46 is an NTC thermistor or the like. A temperature sensor 46 detects the temperature of the heating element 44 .

The elastic sheet 47 presses the temperature sensor 46 against the heat conductive layer 45 (see FIG. 9). The elastic sheet 47 is a silicon sheet. The elastic sheet 47 keeps the parts forming the plate 40 in close contact with each other. The elastic sheet 47 has protrusions 55 for fixing the insulating sheet 48 .

The insulating sheet 48 is a mica sheet. The insulating sheet 48 insulates the parts forming the plate 40 .

The pressing member 49 has a substantially rectangular plate shape elongated in the front-rear direction. The pressing member 49 is provided with an arrangement portion 56 in which the thermal fuse 51 is arranged.

The bracket 52 has a substantially rectangular plate shape elongated in the front-rear direction. The bracket 52 fixes the thermal fuse 51 between itself and the pressing member 49 . Both front and rear ends of the bracket 52 have projecting pieces 52A hooked on the housing 24 . Detachment of the plate 40 is thereby prevented.

The bracket 52 has a positioning portion 57 for positioning the elastic member 41 . The positioning portion 57 is provided so as to protrude from the rear surface of the bracket 52 . The positioning portions 57 are provided at two front and rear portions of the bracket 52 . The positioning portions 57 are positioned on both front and rear sides of the thermal fuse 51 (see FIG. 9).

The elastic member 41 supports the back side of the plate 40, as shown in FIG. The plate 40 is held floating from the housing 24 by an elastic member 41 . The elastic members 41 are arranged at two front and rear positions. The elastic member 41 is tapered in side view. The elastic member 41 has a circular shape in plan view (see FIG. 10). The elastic member 41 has a nonlinear spring characteristic that it is easier to compress when the load from the front side to the back side is smaller than when the load is large. In other words, the difficulty of deformation of the elastic member 41 is constant at the initial stage of compression, and increases as the amount of compression increases after the middle of compression. The maximum axial compression amount of the elastic member 41 is, for example, 1.5 mm. Since the maximum amount of compression of the elastic member 41 is large, the plate 40 can be largely displaced in the front-back direction.

One end of the elastic member 41 in the axial direction is a small diameter portion 41A, and the other end is a large diameter portion 41B. The diameter dimension of the small diameter portion 41A is smaller than the diameter dimension of the large diameter portion 41B. The small diameter portion 41A is arranged on the plate 40 side, and the large diameter portion 41B is arranged on the housing 24 side. The small diameter portion 41A fits on the outer peripheral side of the positioning portion 57 provided on the bracket 52 .

The elastic member 41 is a conical coil spring. A conical coil spring has a nonlinear elasticity that makes it easier to compress when the load from the front side to the back side is smaller than when the load is large. Conical coil springs have the advantage that the coil portions do not interfere when compressed. The relationship between load and deflection of conical coil springs is non-linear. Therefore, the greater the load applied to the conical coil spring, the smaller the amount of change in deflection of the conical coil spring.

Three conical coil springs (referred to as spring 1, spring 2, and spring 3) having different spring characteristics were used to compare the feeling of use of the hair iron 10. FIG. The configuration of each spring 1, 2, 3 is as shown in FIGS. 13 and 14. FIG. The table in FIG. 13 shows the material, lateral elastic modulus, wire diameter, minimum average diameter, maximum average diameter, number of turns, maximum diameter side end turn number, minimum diameter side end turn number, spring Constant, pitch angle, and effective coil free height are shown.

The load of each spring 1, 2, 3 was calculated using Formula 1 below. The deflection of each spring 1, 2, 3 was calculated using the following formula 2.
Formula 1: π×d ⁴ ×G×(α−d′/(2×π×Rs))/(32×Rs ² )
Formula 2: n/(R2-R1) x 16 x P x ( ^Rs4 - ^{R14)/(G x d4 )} + π x α x ( ^R22 - ^Rs2 )-d' x (R2-Rs ))
In formulas 1 and 2, d: wire diameter, G: lateral elastic modulus, α: pitch angle, d′: height direction adhesion pitch, Rs: bonding start radius, R1: minimum average radius, R2: maximum average radius, P: load.

The load and deflection of each spring 1, 2, 3 were calculated using Equation 1 and Equation 2. Calculation results and graphs are shown in FIGS. 15 and 16. FIG. According to the graph of FIG. 16, the load that provides the same amount of deflection is the largest for spring 3 and the smallest for spring 1 .

A plurality of beauticians evaluated the feeling of use of the hair iron 10 using each of the springs 1, 2 and 3 as the elastic member 41. FIG. The results are as follows. The feeling of use of the hair iron 10 using the spring 3 as the elastic member 41 is better than the feeling of use of the hair iron 10 using the spring 1 and the spring 2 as the elastic member 41 . The feeling of use of the hair iron 10 using the spring 2 as the elastic member 41 is better than that of the hair iron 10 using the spring 1 as the elastic member 41 . According to this evaluation result, it can be seen that the more the user can feel the displacement of the plate 40, the better the feeling of use. In other words, the user can easily displace the plate 40 with a weak force and feel that the movement of the fingertips is easily transmitted to the plate 40 because the displacement of the plate 40 is tactile. feel good.

Next, a usage example of the hair iron 10 of this embodiment will be described. The hair iron 10 is palm-sized and small in length and width. Since the plate 40 of the curling iron 10 is small, it is suitable for fine arrangements such as bangs and sideburns.

Charging of the battery 25 is started when the USB cable 21 is inserted into the hair iron 10 and the power supply is connected. Completion of charging of the battery 25 is displayed on the display unit 14 . After the charging of the battery 25 is completed, the USB cable 21 is pulled out. Since the hair iron 10 can be used cordless, it is suitable for use on the go.

The hair iron 10 is powered not only by the battery 25 but also by the power supply connected via the USB cable 21 . FIG. 12 is a flow chart showing processing when a power supply device is connected to the hair iron 10 via the USB cable 21. As shown in FIG. This process is started when a power supply device is connected to the hair iron 10 via the USB cable 21 and the power of the hair iron 10 is turned on. When the process is started, the control circuit of the hair iron 10 determines whether or not the output of the power supply is higher than a predetermined value (eg 36W) (S10). When it is determined that the output of the power supply device is higher than the predetermined value (S10: YES), the control circuit of the hair iron 10 raises the temperature of the heating element 44 with power from the power supply device (S11). On the other hand, when determining that the output of the power supply device is lower than the predetermined value (S10: NO), the control circuit of the hair iron 10 determines whether or not the battery 25 is sufficiently charged (S12). When it is determined that the battery 25 is insufficiently charged (S12: NO), the battery 25 is charged (S13). On the other hand, if it is determined that the battery 25 is sufficiently charged (S12: YES), the control circuit of the hair iron 10 raises the temperature of the heating element 44 with electric power from the battery 25 (S14). It ends when the iron 10 is turned off.

The user removes the cap case 17, moves the operating portion 35 of the locking member 33 to the unlocked position, and opens the hair iron 10. - 特許庁At this time, if the user tries to force the curling iron 10 into the open state without moving the operating portion 35 to the unlocked position, the first lock portion 31 and the second lock portion 32 will hit each other. This allows the user to notice that the curling iron 10 is in the locked state. Even so, when the user tries to open the hair iron 10 forcibly, the contact force between the first lock portion 31 and the second lock portion 32 increases, and the lock member 33 moves to the unlocked position. . This prevents the base end portion 12 of the hair iron 10 from being damaged.

After opening the hair iron 10, the user slides the switch 28 forward. When the power is turned on, the hair iron 10 operates with power from the battery 25 or the power supply device. When the charging of the battery 25 is insufficient, the display unit 14 displays that the charging is insufficient. The temperature of the heating element 44 rises to the set temperature in a short time (about 40 seconds) after the power is turned on.

A user holds hair between the pair of arm portions 13A and 13B. The plate 40 is displaced to adhere to the hair. Since the stroke of the plate 40 is large, the surface of the plate 40 easily adheres to the hair. Further, since the plate 40 is easily displaced with a weak force, the user feels that the movement of the fingertips is easily transmitted to the plate 40 .

Heat from the heating element 44 is efficiently transferred to the surface plate 42 by the carbon-containing thermally conductive layer 43 . The entire surface of the plate 40 heats up generally uniformly, and the plate 40 applies heat evenly to the hair. Further, far-infrared rays are radiated to the hair from the carbon-containing thermally conductive layer 43 . This allows the hair to be arranged quickly while leaving moisture in the hair. In addition, the protrusions 19 of the comb-like portion 18 can improve the flow of hair.

Since the heat of the heating element 44 is efficiently transferred to the surface plate 42 by the carbon-containing thermally conductive layer 43, it is less likely to stay inside the housing 24. Also, the heat inside the housing 24 is efficiently released to the outside by the comb-like portion 18 . Therefore, since it is possible to prevent the outer surface of the clamping portion 15 from becoming hot, the user can grip the outer surface of the clamping portion 15 to move the hair iron 10 .

After using the hair iron 10, the user slides the switch 28 to the power off position to turn off the power. After that, the hair iron 10 is closed, and the operation portion 35 of the lock member 33 is moved to the lock position. As a result, the first locking portion 31 and the second locking portion 32 face each other in the vertical direction, and the hair iron 10 is held in the locked state. After that, the cap case 17 is put on.

Here, even if the hair iron 10 is closed while forgetting to move the switch 28 to the power off position, the switch 28 can be moved to the power off position by covering the cap case 17. - 特許庁Therefore, the hair iron 10 can be prevented from being left with the power on.

Next, the operation and effects of the embodiment configured as described above will be described. The hair iron 10 of this embodiment includes arm portions 13A and 13B extending from the base end portion 12. As shown in FIG. The arm portions 13A and 13B include a surface plate 42, a carbon-containing heat conductive layer 43 extending along the back surface of the surface plate 42, and a heating element 44 arranged on the back side of the carbon-containing heat conductive layer 43. . According to this configuration, the heat of the heating element 44 is transmitted in the plane direction of the surface plate 42 by the carbon-containing thermally conductive layer 43, so that the temperature of the surface plate 42 can be easily made uniform. In addition, since far infrared rays are generated by the carbon-containing thermally conductive layer 43, it is possible to heat the deep part of the hair while suppressing thermal damage to the surface of the hair. Therefore, the hairstyle can be well arranged without damaging the hair.

Also, the carbon-containing thermally conductive layer 43 contains a graphite sheet. According to this configuration, the carbon-containing thermally conductive layer 43 can be made thin, and the hair iron 10 can be miniaturized. In addition, since the surface temperature of the surface plate 42 can be made uniform, uneven protein denaturation of hair due to local temperature rise can be prevented.

Moreover, the carbon-containing thermally conductive layer 43 has flexibility. According to this configuration, the carbon-containing thermally conductive layer 43 is not cracked and can be easily handled.

Moreover, the heating element 44 includes a film heater. According to this configuration, the heating element 44 can be thinned, and the arm portions 13A and 13B can be miniaturized. The heat of the film heater spreads in the planar direction from the heater wire through the carbon-containing thermally conductive layer 43 . Therefore, the temperature of the surface plate 42 can be made uniform in the surface direction while downsizing the arm portions 13A and 13B.

The hair iron 10 also has a battery housing portion 26 for housing a battery 25 and operates with power from the battery 25 . According to this configuration, it can be used in a place where there is no outlet, so it can be easily used as a portable device.

The hair iron 10 also has an insertion port 22 for a USB cable 21 and can be freely connected to a power supply device via the USB cable 21 . When the output of the power supply device is higher than the predetermined value, it operates with power from the power supply device, and when the output of the power supply device is lower than the predetermined value, it operates with power from the battery 25 . According to this configuration, when a power supply having an output higher than a predetermined value is connected, the battery 25 can be operated with the power of the power supply, so that the battery 25 can be used for a long time and can be used even if the battery 25 is not charged. can. When a power supply device with an output lower than the predetermined value is connected, the operation is performed with electric power from the battery 25, so that deterioration in performance due to insufficient output can be prevented.

<Other Examples>
The present invention is not limited to the embodiments explained by the above description and drawings, and the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the hair iron 10 is a hair straightener that sandwiches hair between a pair of arm portions 13A and 13B. Not limited to this, the hair iron has one cylindrical arm portion extending from the base end portion and a plate portion along the outer peripheral surface of the arm portion. It may be a curling iron that sandwiches.
(2) In the above examples, the carbon-containing thermally conductive layer 43 is a flexible sheet. Not limited to this, the carbon-containing thermally conductive layer may be a hard plate member, or may be a carbon material sprayed thereon.
(3) In the above embodiment, the elastic member 41 is a conical coil spring. The elastic member is not limited to this, as long as it is easier to compress when the load from the front side to the back side is smaller than when the load is large. , a combination of a plurality of spring members. When combining a plurality of elastic members, those having different elastic forces may be combined. Also, the elastic member may be rubber, a leaf spring, an unequal pitch coil spring, a tapered coil spring, or the like.
(4) In the above embodiment, the small diameter portion 41A of the conical coil spring is arranged on the plate 40 side, and the large diameter portion 41B is arranged on the housing 24 side. Alternatively, the small diameter portion of the conical coil spring may be arranged on the housing side and the large diameter portion may be arranged on the plate side.
(5) In the above embodiment, the elastic member 41 supports the plate 40 at two points. The elastic member is not limited to this, and may support three or more portions of the plate.
(6) In the above embodiment, the battery 25 is rechargeable. The battery is not limited to this, and may be, for example, a dry battery.
(7) In the above embodiments, the dimensions of the plate 40 were exemplified. The dimension of the plate is not limited to this, and can be changed as appropriate.

DESCRIPTION OF SYMBOLS 10... Hair iron 12... Base end part 13A, 13B... Arm part 21... USB cable 22... Receptacle 25... Battery 26... Battery accommodating part 42... Surface plate 43... Carbon-containing heat conductive layer 44... Heat generating element

Claims (6)

comprising an arm portion extending from the proximal end portion,
The curling iron, wherein the arm portion includes a front plate, a carbon-containing heat conductive layer extending along the back surface of the front plate, and a heating element arranged on the back side of the carbon-containing heat conductive layer. 2. The curling iron according to claim 1, wherein said carbon-containing thermally conductive layer comprises a graphite sheet. The curling iron according to claim 1 or 2, wherein said carbon-containing thermally conductive layer is flexible. The curling iron according to any one of claims 1 to 3, wherein the heating element includes a film heater. Having a battery housing portion for housing a battery,
5. A curling iron as claimed in any one of claims 1 to 4, operated by power from the battery. It has a USB cable outlet,
freely connectable to a power supply device via the USB cable;
When the output of the power supply device is higher than a predetermined value, it operates with power from the power supply device,
6. The curling iron according to claim 5, wherein the electric power from the battery operates when the output of the power supply device is lower than a predetermined value.

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