Hair iron

Abstract

To provide a hair iron capable of reducing damage of the hair.SOLUTION: A hair iron has: a first arm and a second arm openably / closably coupled; a first holding surface provided inside the first arm; a second holding surface provided inside the second arm; and a heating part for heating the hair provided on the first and the second holding surfaces. The heating part has a layer composed at least of platinum.SELECTED DRAWING: Figure 1

Description

[[Technical Field]]

[0001] The present invention relates to a hair iron, and particularly to a hair iron capable of reducing damage to hair. [[Background Art]]

[0002] Generally, hair irons are used for hair styling such as hair straightening, iron blow-drying, and treatment procedures. In such a hair iron, one end of a pair of arm members are rotatably connected to each other, and a heating portion facing the other end side of both arm members is provided. Hair styling can be performed by heating the entire hair by sliding the hair iron toward the tips of the hair while the hair is clamped between the two heated heating portions.

[0003] For example, as a hair iron, there is known a hair styling device (1) including a handheld treatment unit (2), wherein the handheld treatment unit (2) has two arms (3, 4), the two arms (3, 4) are configured to form a clamp including two surfaces (5, 6) facing each other and enable a bundle of hair to be clamped, the handheld treatment unit includes means (7) for diffusing steam, and the means (7) for diffusing steam is configured to diffuse steam from a first surface (5) of the two surfaces to a second surface (6) of the two surfaces. The hair styling device is characterized in that one of the arms (3, 4) has a comb (19) positioned upstream or downstream of one of the surfaces (5, 6) of the arms (3, 4) (Patent Document 1). [[Prior Art Documents]] [[Patent Documents]]

[0004] [[Patent Document 1]] Japanese National Publication of International Patent Application No. 2017-515590 [[Disclosure of the Invention]] [Problems that the invention aims to solve]

[0005] However, in the prior art, including the aforementioned Patent Document 1, the thickness of the arm is sometimes increased in order to increase the heat capacity, which leads to the problem of the overall size and weight increasing.

[0006] Furthermore, before using a hair iron, various chemicals, such as oxidizing agents and reducing agents, may be used, including hair coloring, hair treatments, and bleaching.

[0007] In such cases, after achieving their intended purpose as oxidizing or reducing agents, these products can actually damage the hair. While attempts have been made to reduce hair damage by using products that minimize damage to the hair and by avoiding prolonged use, these efforts have not always been successful.

[0008] For example, hydrogen peroxide, used in bleaching agents, can provide good coloring, but it also has the problem of damaging hair by acting on and breaking down keratin, the main component of hair.

[0009] Furthermore, conventional technologies often focus on straightening curly hair, and do not consider creating permanent waves by setting curls. Moreover, when setting curls as described above, better contact between the arms would allow for more appropriate processing.

[0010] Therefore, the object of the present invention is to provide a hair iron that can improve the contact between the arms. [Means for solving the problem]

[0011] In order to achieve the above objective, the inventors of this invention conducted thorough research on hair irons and, as a result, arrived at the present invention.

[0012] In other words, the hair iron of the present invention comprises a first arm and a second arm that are connected in a way that allows them to be opened and closed, A first clamping surface provided on the inside of the first arm, A second clamping surface provided on the inside of the second arm, A hair iron having heating sections for heating hair provided on the first and second clamping surfaces, wherein the heating section has a layer made of at least platinum The platinum layer is located on the outermost surface of the heating section, and a nickel-copper-nickel layer is located beneath the platinum layer. It is characterized by the following:

[0013] Furthermore, in a preferred embodiment of the hair iron of the present invention, the heating element is further characterized by having a layer made of at least one of nickel, copper, electroless nickel, or aluminum.

[0014] Furthermore, in a preferred embodiment of the hair iron of the present invention, the thickness of the platinum layer is characterized by being 0.05 to 1.0 μm.

[0015] Furthermore, in a preferred embodiment of the hair iron of the present invention, the surface of the heating element is characterized by being buff-polished.

[0016] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are equipped with a hydrogen peroxide reduction device.

[0017] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are further equipped with a temperature control device.

[0018] Furthermore, in a preferred embodiment of the hair iron of the present invention, the hydrogen peroxide reduction device is characterized by reducing hydrogen peroxide by temperature setting.

[0019] Furthermore, in a preferred embodiment of the hair iron of the present invention, the temperature is characterized by being 80°C or higher.

[0020] In a preferred embodiment of the hair iron of the present invention, the temperature is 140°C to 180°C.

[0021] In a preferred embodiment of the hair iron of the present invention, the hair iron further comprises a connecting member that connects the first arm and the second arm.

[0022] In a preferred embodiment of the hair iron of the present invention, the The first and / or second arms are equipped with, hydrogen peroxide reducing device and the temperature control device are integrated.

[0023] In a preferred embodiment of the hair iron of the present invention, the first and / or the second arm is / are provided with a switch for the hydrogen peroxide reducing device and the temperature control device.

[0024] In a preferred embodiment of the hair iron of the present invention, there is one or more connecting members.

[0025] In a preferred embodiment of the hair iron of the present invention, the first and / or the second arm has / have a biasing portion that biases the clamping surfaces to elastically adjust the clamping state formed by the mutual clamping of the clamping surfaces.

[0026] In a preferred embodiment of the hair iron of the present invention, the first and / or the second arm is / are internally provided with a core member along the longitudinal direction.

[0027] In a preferred embodiment of the hair iron of the present invention, the core member has a stopper portion that engages the clamping surface to restrict movement in a protruding direction relative to the first and / or the second arm.

[0028] Furthermore, in a preferred embodiment of the hair iron of the present invention, at least one of the edges of the heating portion in the hair insertion direction has a curl-forming curved surface that is curved in the thickness direction of the heating portion.

[0029] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first arm and / or the second arm are characterized by having a curved surface at the hair insertion direction end on the tip side.

[0030] Furthermore, in a preferred embodiment of the hair iron of the present invention, At least one of the edges of the heating section in the hair insertion direction is curved in the thickness direction of the heating section. Curl-forming surface ,and The aforementioned Located on the hair insertion edge at the tip of the first arm and / or the second arm curved surface , both surfaces It is characterized by having a plane that is continuous with the surface. [Effects of the Invention]

[0031] The hair iron of the present invention offers the advantageous effect of providing a hair iron that can improve the contact between the arms. Furthermore, another embodiment of the hair iron of the present invention offers the advantageous effect of reducing hair damage.

[0032] Furthermore, according to the hair iron of the present invention, when the gripping portion in the middle of the clamping arm is gripped and operated, the base end rotates relative to each other, and the tip end can perform a clamping action. This clamping action provides the advantageous effect of being able to clamp and straighten the hair with the clamping surface (also called the straightening body) positioned opposite to the tip of the clamping arm.

[0033] Furthermore, the hair iron of the present invention has the advantageous effect of allowing for sufficient curl formation because the hair comes into sufficient contact with the curl-forming surface when curling. [Brief explanation of the drawing]

[0034] [Figure 1]Figure 1 shows the effect of a hair iron in one embodiment of the present invention. Although it is difficult to see in the figure, the bar graph is displayed from left to right in the order of hair tips, middle, and roots. [Figure 2] Figure 2 shows a hair iron according to one embodiment of the present invention. [Figure 3] Figure 3 is a top view of a hair iron in one embodiment of the present invention. [Figure 4] Figure 4 shows a hair iron in one embodiment of the present invention, reversed from Figure 5 (the reverse side before assembly). [Figure 5] Figure 5 is a bottom view of a hair iron in one embodiment of the present invention. [Figure 6] Figure 6 shows a reversed view of Figure 3 (the reverse side before assembly) of a hair iron according to one embodiment of the present invention. [Figure 7] Figure 7 shows a hair iron in one embodiment of the present invention. [Figure 8] Figure 8 shows a perspective view of the upper case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are illustrated conceptually. [Figure 9] Figure 9 shows a side view of the upper case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are illustrated conceptually. [Figure 10] Figure 10 shows a perspective view of the lower case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are illustrated conceptually. [Figure 11] Figure 11 shows a side view of the lower case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are illustrated conceptually. [Figure 12]Figure 12 schematically shows the configuration from the heating section to the biasing section in a hair iron according to one embodiment of the present invention. Figure 12(a) shows a perspective view of the plate, Figure 12(b) shows the plate and the components inside the plate, Figure 12(c) shows a cross-sectional view of the plate and the components inside the plate, and Figure 12(d) shows an example of the configuration of the components inside the plate. [Modes for carrying out the invention]

[0035] The hair iron of the present invention comprises a first arm and a second arm that are connected in a way that allows them to be opened and closed, A first clamping surface provided on the inside of the first arm, A second clamping surface provided on the inside of the second arm, A hair iron having heating elements for heating hair provided on the first and second clamping surfaces, wherein the heating elements are characterized by having a layer made of at least platinum. In the present invention, the first arm and the second arm only need to be connected in an openable and closable manner, and are not particularly limited. In the present invention, it is possible to clamp hair using the first clamping surface provided on the inside of the first arm and the second clamping surface provided on the inside of the second arm. It is possible to style the hair through both clamping surfaces by heating elements for heating hair provided on the first and second clamping surfaces.

[0036] Furthermore, in a preferred embodiment of the hair iron of the present invention, the heating element is characterized by having a layer made of at least one of nickel, copper, electroless nickel, or aluminum, from the viewpoint of improving adhesion with platinum. In the heating element, the outermost platinum surface can come into direct contact with the hair. Regarding the order of the layers, there is a risk of insufficient adhesion between aluminum and platinum, and the adhesion can be improved by sandwiching nickel-copper-nickel in between. Also, there is a risk of insufficient adhesion with combinations of aluminum and copper, and platinum and copper, and when using all materials, it is preferable to use the order of platinum, nickel, copper, electroless nickel, and aluminum.

[0037] Furthermore, as shown in Figure 12, which will be described later, strictly speaking, the heating section can be composed of a plate, with a heating source such as a ceramic heater in the layer below the plate. These heating sections (plates) can be shaped, for example, as shown in Figure 12, as will be described later.

[0038] Furthermore, in a preferred embodiment of the hair iron of the present invention, the thickness of the platinum layer is characterized by being 0.05 to 1.0 μm, from the viewpoint of cost reduction and improved adhesion. This is because if it is outside this range, there is a risk that the corners will bulge, and the adhesion between the plates will be poor.

[0039] In a preferred embodiment, the thickness of the nickel layer is preferably 1 to 20 μm, more preferably 5 to 10 μm. In a preferred embodiment, the thickness of the copper layer is preferably 1 to 10 μm, more preferably 2 to 5 μm. In a preferred embodiment, the thickness of the electroless nickel layer is preferably 1 to 10 μm, more preferably 3 to 5 μm. In a preferred embodiment, the thickness of the aluminum layer is preferably 0.1 to 10 μm, more preferably 1 to 3 μm.

[0040] Furthermore, in a preferred embodiment of the hair iron of the present invention, the surface of the heating element is characterized by being buff-polished. For example, by buff-polishing the surface of the aluminum plate constituting the heating element to make it smoother, it becomes possible to eliminate unevenness in the layer placed on top of it, such as the platinum layer. Moreover, by buff-polishing in this manner, it becomes possible to improve the adhesion when plates plated up to the platinum layer are joined together. In addition, deburring of the four corners of the plate may be performed.

[0041] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are equipped with a hydrogen peroxide reduction device. This makes it possible to efficiently remove excess hydrogen peroxide, such as that used in bleaching agents, and thereby minimize damage to the hair. The hydrogen peroxide reduction device only needs to be installed on the arms, and its location is not particularly limited. In a preferred embodiment, from the viewpoint of avoiding the clamping surface which is expected to become hot due to the heating section, it can be installed anywhere from the center of the arm to the handle side of the arm.

[0042] Furthermore, in a preferred embodiment of the hair iron of the present invention, the hydrogen peroxide reduction device is characterized by reducing hydrogen peroxide by temperature setting. In a preferred embodiment of the hair iron of the present invention, the aforementioned temperature is characterized by being 80°C or higher, from the viewpoint of when hydrogen peroxide begins to be reduced. Furthermore, in a preferred embodiment of the hair iron of the present invention, the aforementioned temperature is characterized by being 140°C to 180°C, from the viewpoint of reducing hydrogen peroxide more efficiently.

[0043] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are further equipped with a temperature control device. The temperature setting device only needs to be installed on the arm, and its location is not particularly limited. In a preferred embodiment, from the viewpoint of avoiding the clamping surface which is expected to become hot due to the heating part, it can be installed anywhere from the center of the arm to the handle side of the arm.

[0044] In some cases, a temperature control device is installed in the middle of the power cord coming out of the hair iron body, but in this case, it is necessary to pull the cord to turn the power on and off. On the other hand, in the present invention, the hydrogen peroxide reduction device and the temperature control device are installed inside the arm, and as will be described later, if the switch function is installed inside the arm, it is possible to turn the power on and off while holding the hair iron in the right hand, and if a dial-type adjustment mechanism is used, the hydrogen peroxide and temperature can be easily adjusted by turning the dial with the thumb, thereby improving operability.

[0045] Furthermore, in a preferred embodiment of the hair iron of the present invention, the hair iron is further characterized by having a connecting member that connects the first arm and the second arm. The connecting member between the two arms makes it possible to suppress the wobble of the tip of the iron (i.e., the lateral wobble when viewed from the tip of the iron). Specifically, it makes it possible to ensure that the plate surfaces align without misalignment when the iron is pressed. In addition, in a preferred embodiment of the hair iron of the present invention, the connecting member is characterized by being one or more, from the viewpoint of operability.

[0046] Furthermore, in a preferred embodiment of the hair iron of the present invention, the hydrogen peroxide reduction device and the temperature control device are integrated for ease of operation. Also, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are equipped with switches for the hydrogen peroxide reduction device and the temperature control device. As mentioned above, in some cases the temperature control device is installed in the middle of the power cord coming out of the hair iron body, but in this case, it is necessary to pull the cord to turn the power on and off. On the other hand, in the present invention, the hydrogen peroxide reduction device and the temperature control device are installed inside the arms, and switches can also be provided, so it is possible to improve operability.

[0047] It is also acceptable to bleach the hair before using a hair iron. The bleaching process involves using an alkaline agent to soften the hair. The main components of bleach are hydrogen peroxide and ammonia water (alkaline substances). Ammonia water acts on the cuticle on the surface of the hair, causing it to swell and soften. Hydrogen peroxide then penetrates into the swollen and softened hair, and reacts chemically with melanin. When black hair is bleached, it changes color depending on the application time: reddish-brown → reddish-orange → yellowish-orange → yellow. This is largely because the blackish-brown "eumelanin" is broken down, while the orange-red "pheomelanin" is difficult to break down.

[0048] However, hydrogen peroxide doesn't only oxidize melanin. It can also break down keratin, the main component of hair, potentially damaging it.

[0049] In this invention, it is possible to minimize hair damage by removing the hydrogen peroxide as quickly as possible.

[0050] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are characterized by having a biasing portion that biases the clamping surface and elastically adjusts the clamping state between the clamping surfaces. When the gripping portion in the middle of the first and / or second arms is grasped and operated, the base ends of the first and / or second arms rotate relative to each other, and the tip ends of the first and / or second arms (also called the first and / or second clamping arms) can perform a clamping action. This clamping action allows the hair to be clamped and straightened by the clamping surfaces (clamping surfaces) arranged opposite each other at the tip ends of the arms.

[0051] Furthermore, the clamping arm may be provided with a movable support such that at least one of the clamping surfaces can move back and forth relative to the other side, and the clamping arm may be provided with a biasing part that biases the clamping surfaces to elastically adjust the clamping state between the clamping surfaces. This makes it possible to securely clamp hair between the clamping surfaces. The biasing part is not particularly limited, and for example, a spring, leaf spring, spring, rubber, etc., can be used. In addition, the biasing part, for example, a spring, may be separated from the magnet retaining leaf spring to increase the holding force, such as the spring that holds the bimetallic type thermal fuse. This makes it possible to sense the transmission of temperature with greater accuracy.

[0052] Furthermore, in a preferred embodiment of the hair iron of the present invention, the first and / or second arms are characterized by having a core material built in along their longitudinal direction.

[0053] Furthermore, a core material is installed inside the arm so that its longitudinal direction is aligned at least from the tip side to the gripping portion, and this core material maintains its hardness up to a higher temperature than the clamping arm, thereby preventing easy deformation of the tip side of the clamping arm due to heat generated by the heating portion of the clamping surface. Consequently, the gripping portion of the clamping arm can be gripped and force can be smoothly transmitted from the tip side of the clamping arm to the clamping surface, enabling reliable clamping and straightening of the hair.

[0054] Therefore, even if the clamping arm is made thinner to reduce its heat capacity, it is possible to reliably clamp and straighten the hair, and by making the overall weight reduction, it becomes easy to grip the clamping arm and perform fine straightening of curly hair for a certain period of time with flexible operation.

[0055] Furthermore, the core material can be partially provided with a receiving portion that supports the biasing portion, facing the back of the biasing portion. This allows the clamping reaction force from the clamping surface to be received by the receiving portion via the biasing portion, enabling more secure clamping and straightening of the hair by the clamping surfaces.

[0056] Furthermore, since the receiving portion can be provided partially, its shape is less affected by the curved shape of the clamping arm, and the receiving portion can be easily positioned on the back of the biasing portion.

[0057] Furthermore, in a preferred embodiment of the hair iron of the present invention, the core material is characterized by having a stopper portion that engages with the clamping surface and restricts its movement in the protruding direction relative to the first and / or second arm. That is, the movement of the clamping surface in the protruding direction relative to the clamping arm can be restricted by engaging with the stopper portion. Therefore, rattling of the clamping surface relative to the clamping arm can be restricted, and the clamping and straightening of hair by the clamping surfaces can be performed more accurately.

[0058] Furthermore, in a preferred embodiment, the clamping arm can be made separable. That is, the arm can have a joint structure in which the separable parts are joined together by fasteners, and the core material can be pre-attached to one of the separable parts by a temporary fastening part provided at one end in the longitudinal direction. Therefore, when joining the separable parts together and joining them together with fasteners, there is no need to handle the core material individually, and at the same time as fastening the separable parts together, predetermined parts of the core material can be attached to the clamping arm by fastening together. For this reason, there is no need to handle the core material individually when joining the separable parts, and the assembly of the clamping arm can be made easier.

[0059] Furthermore, in a preferred embodiment of the hair iron of the present invention, from the viewpoint of setting curls, at least one of the edges of the heating portion in the hair insertion direction has a curl-forming curved surface that is curved in the thickness direction of the heating portion. The clamping surface has heating portions that face each other, and at least one of the edges of the heating portion in the hair insertion direction can be provided with a curl-forming curved surface that is curved in the thickness direction of the heating portion. It is also possible to provide at least one of the edges of the clamping arm tip in the hair insertion direction with a curved surface and / or a flat winding surface for winding the hair.

[0060] It is also possible to arrange the hair wrapped around the curl-forming curved surface so that it extends linearly from the curved surface and contacts the curved or flat surface of the wrapping surface. This allows for more effective curl setting by ensuring that the hair is in sufficient contact with the curl-forming curved surface when curling.

[0061] Furthermore, when applying tension to the hair by wrapping it around the gripping arm and attempting to press the hair against the curl-forming surface, the hair can be easily slid along the curved or flat wrapping surface on the gripping arm side. Therefore, the tension applied to the hair by wrapping can be effectively utilized to press it against the curl-forming surface, allowing for more sufficient curl formation.

[0062] Furthermore, in a preferred embodiment of the hair iron of the present invention, from the viewpoint of creating different types of curls, the first arm and / or the second arm are characterized by having a curved surface at the hair insertion direction end on the tip side.

[0063] In the present invention, the clamping surface is equipped with a heating section having opposing straightening surfaces, and it is possible to provide a curved surface that curves in the thickness direction of the heating section on both ends of the heating section in the hair insertion direction, as well as a curved or flat winding surface for winding the hair on both ends of the clamping arm tip side in the hair insertion direction.

[0064] This changes the degree to which the hair wraps around the two curl-forming curved surfaces, making it easy to create curls with different variations.

[0065] Furthermore, in a preferred embodiment of the hair iron of the present invention, from the viewpoint of being able to accurately clamp and straighten hair and accurately set curls, it is further characterized by having the curl-forming curved surface and / or a plane continuous with the curved surface.

[0066] In the present invention, at least one of the clamping surfaces is supported by the clamping arm so as to be able to move forward and backward relative to the other side, and the clamping arm can be provided with a biasing part that biases the clamping surface to move forward and elastically adjusts the clamping state between the clamping surfaces. Furthermore, when the clamping surface is retracted, the hair wrapped around the curl-forming curved surface has a plane that is continuous with the curl-forming curved surface and / or the curved surface, that is, it extends linearly from the curl-forming curved surface and contacts the curved surface or plane of the wrapping surface, so that the hair can be accurately clamped and straightened by the opposing, movable clamping surfaces, and the curl can be accurately set.

[0067] In this invention, the winding surface has a plane perpendicular to the clamping surface (straightening surface), and the plane of the winding surface and the curl-forming curved surface are close together in the direction of hair insertion. Therefore, the tension applied to the hair by winding can be directly used as a pressing force on the curl-forming curved surface by sliding it along the plane of the winding surface, making it possible to set the curl more reliably and easily.

[0068] Furthermore, in this invention, the plate, arm, cord, temperature control, magnet, etc., can be improved or modified. For example, the plate plating thickness can be modified to improve adaptability during hair styling. Also, a stopper to prevent arm lateral displacement may be provided from the viewpoint of preventing lateral displacement. Also, an AC cord may be provided from the viewpoint of preventing wire breakage. Furthermore, painting (3 layers) can be applied from the viewpoint of preventing peeling, chemical resistance, and color coordination. In addition, magnets may be used in the configuration between the biasing part and the plate from the viewpoint of heat resistance and magnetic force.

[0069] Furthermore, temperature control is possible to shorten the time it takes to reach the set temperature. A reinforcing plate design may also be adopted to ensure sufficient strength.

[0070] Furthermore, mechanically, the hair iron's upper and lower cases contain a platinum plate, heat-dissipating silicone, a ceramic heater, a mica plate, a heat-resistant magnet, a magnet retainer, and a plate retainer. For control, it can be equipped with a thermistor, a bimetallic thermal fuse, and a PCB unit. Moreover, various effects occur on various molecules such as water molecules due to magnetism, temperature, and platinum components, and through a complex differential effect, it is possible to create a better and more effective situation. [Examples]

[0071] The following describes examples using the hair iron of the present invention, but the present invention is not limited to the following examples.

[0072] Example 1 Figure 2 shows a hair iron according to one embodiment of the present invention. In the figure, 1 is the first arm, 2 is the second arm, 3 is the first clamping surface, 4 is the second clamping surface, 5 is the hydrogen peroxide reduction device, 6 is the temperature control device, 7 is the connecting member, 8 is the connecting member, and 9 is the switch. A brief explanation of how to use this hair iron is as follows: The power plug is inserted into an outlet, and the heater (heating source) heats the clamping surfaces (3,4). The first and second arms clamp the hair between the clamping surfaces (3,4), and the heating element heats the hair, allowing the hair iron to be used along the processing surface of the clamping surfaces (3,4) on the clamped hair. In this example, the hydrogen peroxide reduction device 5 is installed inside the arm, and the switch 9 function is also installed inside the arm. Therefore, the power can be turned on and off while holding the hair iron in the right hand. Furthermore, in this example, the hydrogen peroxide reduction device 5 and the temperature control device 6 are integrated and have a dial-type adjustment function. Therefore, the adjustment of hydrogen peroxide and temperature can be easily done by turning the dial with the thumb, thus improving operability. Note that the temperature adjustment of the hydrogen peroxide reduction device 5 and the temperature control device 6 is not limited to a dial, but can be done by push buttons, levers, etc., and is not particularly limited.

[0073] Additionally, for hair irons equipped with a "hydrogen peroxide removal" mode, it is possible to add a "hydrogen peroxide removal" mode to the iron's dial and set the temperature to 150°C.

[0074] Figure 3 is a top view of a hair iron according to one embodiment of the present invention. In the figure, 33 indicates one side of the tip side 29, 31, 35 indicates one side of the gripping part 21, 23, 37 indicates the inclined surfaces of both sides 33, 35, and 39 indicates the other side of the tip side 29, 31.

[0075] Figure 4 shows a hair iron in one embodiment of the present invention, reversed from Figure 5 (the reverse side before assembly).

[0076] Figure 5 shows a bottom view of a hair iron according to one embodiment of the present invention. In the figure, 33 indicates one side of the tip side 29, 31, 35 indicates one side of the gripping part 21, 23, 37 indicates the inclined surfaces of both sides 33, 35, and 39 indicates the other side of the tip side 29, 31.

[0077] Figure 6 shows a reversed view of Figure 3 (the reverse side before assembly) of a hair iron according to one embodiment of the present invention.

[0078] Figure 7 shows a hair iron according to one embodiment of the present invention. In the figure, 3 is the first clamping surface, 4 is the second clamping surface, 15 and 17 are the base end, 19 is the rotation axis, 21 and 23 are the gripping parts, 25 and 27 are the points of force application, and 29 and 31 are the tip ends.

[0079] Figure 8 shows a perspective view of the upper case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are conceptually illustrated. In the figure, 50 indicates the core material, and 51 indicates the plate and other parts.

[0080] Figure 9 shows a side view of the upper case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are conceptually illustrated. In the figure, 50 indicates the core material, and 51 indicates the plate and other parts.

[0081] Figure 10 shows a perspective view of the lower case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are conceptually illustrated. In the figure, 50 indicates the core material, and 51 indicates the plate and other parts.

[0082] Figure 11 shows a side view of the lower case portion of the main body for assembling the upper and lower parts of a hair iron in one embodiment of the present invention. The plate and core material that constitute the heating section are conceptually illustrated. In the figure, 50 indicates the core material, and 51 indicates the plate and other parts.

[0083] Figure 12 schematically shows the configuration from the heating section to the biasing section in a hair iron according to one embodiment of the present invention. In the figure, 60 is a plate, 61 is a ceramic heater (heating source), 62 is a mica plate, 63 is a bimetal, 64 is a bimetal retainer, 65 is a leaf spring for retaining the magnet, 66 is a leaf spring for the plate (biasing section), and 67 is a magnet. Figure 12(a) shows a perspective view of the plate, Figure 12(b) shows the plate and components within the plate, Figure 12(c) shows a cross-sectional view of the plate and components within the plate, and Figure 12(d) shows an example of the configuration of components within the plate. The plate is formed using an aluminum base as shown in Figure 12(a), and can be plated thereon in the order of electroless nickel, copper, nickel, and platinum. As shown in Figure 12(b), the components of the plate, such as the ceramic heater (heat source) 61, mica plate 62, bimetal 63, bimetal retainer 64, magnet retaining leaf spring 65, plate leaf spring (biasing part) 66, and magnet 67, can be arranged, for example, as shown in Figure 12(d). As shown in the figure, by changing the spring and separating the spring that holds the bimetal type thermal fuse from the magnet retaining leaf spring, it is possible to further improve the holding force. Furthermore, with these configurations, it is also possible to sense the temperature transfer with greater accuracy.

[0084] As shown in these diagrams, the hair iron comprises an iron body to which a power cord is connected. The power cord may also be equipped with a temperature control device, a power plug, etc.

[0085] Next, an embodiment of a hair iron having a biasing part, core material, stopper part, etc. will be described.

[0086] The iron body comprises a pair of clamping arms and a pair of clamping surfaces 3 and 4. The clamping arms are made of a resin such as a polyester-based engineering plastic with a coefficient of thermal expansion of 8.8 × 10⁻⁵ cm / cm / °C, and their base ends 15 and 17 can be rotatably connected to each other by a rotating shaft 19. Gripping portions 21 and 23 are provided in the middle of each clamping arm. These gripping portions 21 and 23 are formed relatively thick, as shown in Figure 7, to facilitate gripping, and can be made approximately the same thickness as the base ends 15 and 17.

[0087] The gripping portions 21 and 23 are provided with fulcrum points 25 and 27 formed on their tip ends, with inclined surfaces. These fulcrum points 25 and 27 are designed to allow the thumb or index finger to apply force when gripping the gripping portions 21 and 23. When viewed from the side in Figure 7, the fulcrum points 25 and 27 are formed to be slightly larger than the entire gripping portions 21 and 23, making it easier to apply force with the thumb or index finger.

[0088] The tip ends 29 and 31 of the clamping arms are formed to be thinner than the gripping portions 21 and 23 in the direction of alignment, as shown in Figure 7. Furthermore, the tip ends 29 and 31 are formed to be thinner than the gripping portions 21 and 23, as shown in Figure 3, and are set to be offset to one side relative to the gripping portions 21 and 23. Consequently, one surface 33 of the tip ends 29 and 31 protrudes to one side more than one surface 35 of the gripping portions 21 and 23, and both surfaces 33 and 35 are set to be continuous in a stepped manner by the inclined surface 37. The other surface 39 of the tip ends 29 and 31 is formed to be offset to one side in accordance with the one surface 33, and is recessed into the central side of the gripping portions 21 and 23.

[0089] Such clamping arms are formed in a hollow shape, and may be divided into sections from the central part to form a joint structure. These divided sections can be fastened together with fasteners, such as screws, at the tip ends 29, 31, gripping portions 21, 23, and base ends 15, 17. Fastening holes may be formed through the divided sections at the tip ends 29, 31, although these are not shown in the figures.

[0090] Multiple reinforcing ribs may be provided within the hollow gripping portions 21 and 23, although these are not shown. One of the gripping arms may have protrusions on the opposing sides of both arms, and the other gripping arm may have a recess into which the protrusion fits. The protrusion may abut against the bottom surface of the recess to function as a stopper.

[0091] Thus, the clamping arm is configured such that the base ends 15 and 17 are rotatably connected to each other, and the tip ends 29 and 31 perform a clamping action when the gripping parts 21 and 23 in the middle section are operated.

[0092] In the following explanation, since the tip ends 29 and 31 of the clamping arm are symmetrical, tip end 29 will be described, and the other tip end 31 will refer to the description of tip end 29.

[0093] The tip end 29 may be provided with a flat vertical wall surface and a flat bottom wall surface that house a core material inside. The tip end 29 may also be provided with a clamping surface support hole that movably supports the clamping surface 3 so that it can move back and forth relative to the other side. The clamping surface 3 can be movably supported in the clamping surface support hole.

[0094] Therefore, the clamping surfaces 3 and 4 are positioned opposite the tip ends 29 and 31 of the clamping arms, and the hair is heated and straightened by the clamping motion of the clamping arms.

[0095] The clamping surface 3, when viewed from the side of the clamping surface, consists, in order, a heating section, a ceramic heater, a magnetic plate, a first spring, and a second spring. A housing section is integrally provided behind the heating section, and the ceramic heater, magnetic plate, and first spring can be housed in the housing section. Furthermore, the heating section and the arm can be fixed by pressing the housing section in the direction of the hair contact surface using the first and second springs.

[0096] The heating element is formed from a lightweight material with high thermal conductivity, such as aluminum, into a rectangular plate shape when viewed from the opposite side, and its surface is coated with fluorine.

[0097] Furthermore, protrusions can be provided on the upper and lower walls of the housing to restrict the heating element from protruding beyond a certain point.

[0098] The ceramic heater has a rectangular plate shape, generates heat up to a maximum temperature of approximately 180°C, and conducts heat to the heating element, and is electrically connected to the power cord side.

[0099] The aforementioned magnet plate is formed in the shape of a rectangular plate using a 15,000 gauss neodymium magnet or the like, and is arranged so that the south poles face each other on both clamping surfaces 3 and 4.

[0100] In this embodiment, one of the biasing parts is a first spring, which is made of a leaf spring and biases the magnet plate in the direction toward the back of the heating part within the housing, causing the ceramic heater to be in close contact with the back of the heating part, and also providing stable support for the magnet plate.

[0101] Another biasing component is a second spring. The second spring is supported at the rear end of the housing portion and constitutes a biasing component that biases the clamping surfaces 3 and 4 to elastically adjust the clamping state between the clamping surfaces 3 and 4. In the divided embodiment, the second spring is formed of a leaf spring, and both ends of the leaf spring are set to be inclined so that the edges can engage with the projection on the divided portion side in the left-right direction (longitudinal direction).

[0102] A core material is further housed within the aforementioned tip sections 29 and 31. This core material is formed in a symmetrical shape. One core material will be described, and the other core material will be described by referring to the first core material, and its description will be omitted.

[0103] The core material is installed inside the clamping arm so that its longitudinal direction is aligned from the tip side 29 to at least the gripping portion 21. However, it is also possible to install the core material inside the clamping arm from the tip side 29 to the entire base side 15.

[0104] The core material maintains its hardness up to a higher temperature than the clamping arm, thereby restricting thermal deformation of the clamping arm. Therefore, in this embodiment, the core material is made of stainless steel, a material with a smaller coefficient of thermal expansion than the resin material of the clamping arm. However, the core material only needs to have a smaller coefficient of thermal expansion than the clamping arm, and can also be made of titanium, ceramic, super engineering plastic, etc.

[0105] The core material may have fastening sections integrally provided at both ends of the long plate-shaped base portion. These fastening sections can be fastened together with the joined sections. The fastening sections are provided with holes for inserting screws, which are fasteners. A temporary fastening section may be provided at the end of the fastening section. This temporary fastening section is provided at one end in the longitudinal direction of the core material and is for pre-connecting to the section. This temporary fastening section is provided with a positioning hole that fits onto a positioning pin protruding from the section side. The temporary fastening section is also provided with a hole for inserting screws, which are fasteners for temporary fastening.

[0106] A vertical wall is provided along one side edge of the long plate-shaped base portion. The vertical wall also serves as a stopper for the clamping surface 3. The other vertical wall is provided along the other side edge of the base portion and the other side edge of the fastening portion and temporary fastening portion.

[0107] In an embodiment in which the hair iron can be divided, the vertical wall portion may further have first and second fastening walls protruding from it. The first and second fastening walls may be installed near the center of the vertical wall portion which has a U-shaped cross-section. These first and second fastening walls are fastened and fixed to the divided portion of the arm. The first fastening wall portion is located between the ends of the second spring. That is, the first fastening wall portion can form a receiving portion that supports the second spring, facing the back of the second spring which is the biasing portion.

[0108] Next, we will explain how to use the aforementioned hair iron to straighten curly hair or correct artificial permanent waves. Of course, it is also possible to create permanent waves using a hair iron.

[0109] First, when using the hair iron, the hair is first coated with a first agent, which is an aqueous solution mainly composed of mercapto compounds (reducing agents) such as thioglycolic acid and cysteine, to which basic substances such as ammonia, monoethanolamine, and triethanolamine are added to adjust the pH to 6-10. This coating reduces the disulfide bonds of cystine contained in the keratin protein in the hair, cleaving them into mercapto groups. After that, the hair is washed with water and dried sequentially with a hairdryer, etc., and then the hair is straightened using a hair iron 1 heated to 140-180°C.

[0110] Specifically, the user grips the gripping parts 21 and 23 of the clamping arm, applies force by placing the thumb and index finger on the force application points 25 and 27, and clamps the hair between the heated parts of the clamping surfaces 3 and 4. Then, while maintaining this position, the user slides the clamping arm down to the ends of the hair. As a result, the hair, clamped between the heated parts heated by the ceramic heater, is heated and straightened.

[0111] At this time, the hair moves at a predetermined speed between the magnetic plates with their south poles facing each other, and according to Fleming's right-hand rule, reduction energy is generated. This energy is generated by electrons from the magnetic poles of the clockwise rotating magnetic plates, promoting the reduction action of the first solution. Moreover, it also works to close the cuticle that forms the outer layer of the hair. When the cuticle is closed, it blocks ultraviolet rays from penetrating into the hair, thus preventing the hair from being damaged by ultraviolet rays.

[0112] Furthermore, this reduction energy reduces the size of the water clusters in the first solution. This reduction in cluster size increases the penetration of the first solution into the hair. As a result, the reducing action of the first solution is further promoted. Consequently, the treatment time, which carries the risk of damaging the hair, can be shortened, and hair damage can be suppressed.

[0113] Subsequently, a second solution consisting of an aqueous solution of an oxidizing agent such as sodium bromate and hydrogen peroxide is applied to the hair. As a result, the mercapto groups are oxidized, new disulfide bonds are generated in the hair, and this straight hair state can be fixed.

[0114] During this type of hair clamping and straightening process, the heat from the ceramic heater is also conducted to the tip ends 29 and 31 of the clamping arms, reducing their hardness and making them more susceptible to deformation.

[0115] Therefore, without a core material, when hair is clamped between the heating sections, the reaction force applied to the tip sections 29 and 31 of the clamping arms can easily deform them, potentially preventing the heating sections from clamping the hair evenly. This problem can be improved by providing a core material.

[0116] In other words, the core material is installed inside from the tip side 29, 31 to at least the gripping portion 21, 23, and the gripping portion 21, 23 side maintains a temperature that allows it to be gripped by hand compared to the tip side 29, 31, thus firmly supporting the core material on the gripping portion 21, 23 side.

[0117] Furthermore, since the side of the core material that is firmly supported in this manner is located within the force application points 25 and 27 of the gripping parts 21 and 23, force can be accurately transmitted from the force application points 25 and 27 to the core material.

[0118] By accurately transmitting force to this core material, the clamping surfaces 3 and 4 are supported by the core material, preventing easy deformation of the tip sides 29 and 31. Therefore, the heating parts can be precisely positioned opposite each other, allowing the hair to be clamped and the above procedure to be performed accurately.

[0119] Furthermore, in this embodiment, the clamping surfaces 3 and 4 are biased by the second spring portion, which is the biasing portion, and the clamping state between the clamping surfaces 3 and 4 is elastically adjusted, so that the above procedure can be performed more accurately.

[0120] The movement of the clamping surfaces 3 and 4 in the protruding direction can be restricted by the vertical wall portion (installed on the core material) which acts as a stopper, thereby suppressing rattling of the clamping surfaces 3 and 4, maintaining the precise forward and backward movement of the clamping surfaces 3 and 4 due to the biasing action of the second spring portion for a long period of time, and accurately maintaining the precise clamping state of the heated portion.

[0121] The second fastening wall, which acts as the receiving portion, can receive the second spring portion by facing the back of the second spring, which is the biasing portion, and contacting both ends of the wall, thereby allowing the reaction force of the second spring portion to be accurately applied to the heating portion.

[0122] Therefore, the clamping state between the clamping surfaces 3 and 4 by the second spring can be accurately maintained regardless of the temperature rise at the tip sides 29 and 31. Moreover, since the first fastening wall portion, which acts as a receiving portion, is partially provided on the core material, it can be formed without being affected by the shape, even if the clamping arm is in a form that tapers from the gripping portions 21 and 23 towards the tip sides 29 and 31. The base portion of the core material can be placed on the flat bottom wall surface of the tip sides 29 and 31 (the flat portion corresponding to the bottom edge in the cross-section of the roughly trapezoidal tip sides 29 and 31), and can be positioned straight and smoothly all the way to the gripping portions 21 and 23.

[0123] It should be noted that the present invention is not limited to the above embodiments. For example, one or both of the clamping surfaces 3 and 4 can be fixed in place and cannot move relative to the tip sides 29 and 31. The magnet plate and the first spring can be omitted. The vertical wall portion of the core material, the first fastening wall portion, etc. can also be omitted.

[0124] Next, an example of a hair iron having a curling surface, a curved surface, and a plane continuous with the curved surface will be described.

[0125] In this embodiment, the following effects are obtained. That is, when tension is applied to the hair by wrapping it around the clamping arm and attempting to press the hair against the curl-forming curved surface, the hair can be easily slid along the curved surface on the clamping arm side. Therefore, the tension applied to the hair by wrapping it can be effectively used to press it against the curl-forming curved surface, and sufficient curl can be set.

[0126] In another embodiment, curl-forming curved surfaces are provided on both ends of the heating plate in the hair insertion direction, and on both ends of the clamping arm tip side in the hair insertion direction, and one of the back surfaces of the heating plate is positioned opposite the curved surface on the clamping arm tip side, thereby changing the degree to which the hair wraps around both curl-forming curved surfaces, making it easy to create different variations of curls.

[0127] In another embodiment, at least one of the straightening bodies is supported on the clamping arm so as to be able to move forward and backward relative to the other side, the clamping arm is provided with a biasing means for biasing the straightening bodies and elastically adjusting the clamping state between the straightening bodies, and a plane continuous with the curved surface is provided on the tip side of the clamping arm, so that when the straightening body is retracted, the hair wrapped around the curl-forming curved surface extends linearly from the curl-forming curved surface and contacts the curved surface or the plane, thereby enabling accurate clamping and straightening of the hair by opposing, movable straightening bodies, and accurate curl setting.

[0128] In another embodiment, a plane continuous with a curved surface is perpendicular to the straightening surface, and the distance between the plane and the curl-forming curved surface in the hair insertion direction is close. Therefore, the tension applied to the hair by wrapping can be directly utilized as a pressing force against the curl-forming curved surface by sliding the hair along the curved surface or the plane, making it possible to set the curl more reliably and easily.

[0129] For other components, please refer to the description of the hair iron above. Below, we will focus on curved surfaces and the like. There are two tip sections, 29 and 31, but since both tip sections 29 and 31 have a nearly symmetrical, rounded, trapezoidal cross-section, we will use one of the tip sections 29 for the explanation.

[0130] The heating portion of the clamping surface 3 is provided with a flat straightening surface. However, this straightening surface is not limited to a flat surface; it can be set to various shapes such as a curved surface or an S-shaped surface. The clamping surface 4 also has a straightening surface similar to the aforementioned surface, and these surfaces face each other.

[0131] The heating section is provided with a curl-forming curved surface on both of its edges in the hair insertion direction (the edge from the front to the back of the paper in Figure 7), which is curved in the thickness direction of the heating section (the up and down direction in Figure 7). The curl-forming curved surface is formed over the entire thickness direction of the heating section and exhibits a quarter-circle arc.

[0132] On both ends of the hair insertion direction edge of the clamping arm tip side 29, curved or flat winding surfaces for winding hair are provided (the cross-section of the tip 29 in the direction perpendicular to the longitudinal direction can be a rounded, substantially trapezoidal shape, and the upper and lower bottom portions of this rounded, substantially large shape, and on the heating side). That is, the upper bottom portion of the rounded, substantially trapezoidal shape can be used as a curved winding surface for winding hair, and the lower bottom portion can be used as a flat winding surface for winding hair, or the reverse configuration may also be used. Curl-forming curved surfaces can be formed at both ends of the heating section (clamping surface 3), while winding surfaces can be formed at both ends of the clamping arm tip side 29. The relationship between the curl-forming curved surface and the winding surface allows for changes in the degree to which hair winds onto both curl-forming curved surfaces, making it easy to create different variations of curls. In other words, it is possible to utilize two surfaces with different curvatures: the curl-forming curved surface at the end of the heating section and the winding surface on the arm tip side 29.

[0133] The winding surface has a curve that is curved in the same direction as the curl-forming surface. The curved surface of the rounded, roughly trapezoidal lower base portion (where the length of the lower base portion is longer than the length of the upper base portion) is formed by a circular arc with a larger radius than the curved surface of the upper base portion.

[0134] The winding surface of the rounded, roughly trapezoidal lower base portion similarly has a flat surface that is continuous with the curved surface of the lower base portion at the hair insertion direction end of the clamping arm tip side 29. This flat surface is formed to be perpendicular to the straightening surface. The flat surface of the winding surface of the lower base portion and the curl-forming curved surface of the lower base portion are close in protruding positions in the hair insertion direction. The winding surface of the lower base portion has a winding curved surface on the opposite side from the straightening surface that is continuous with the flat surface.

[0135] On the other hand, the winding surface of the rounded, roughly trapezoidal upper base portion similarly has a winding guide surface as a curved surface with an even larger radius of curvature, continuous with the curved surface of the upper base portion of the hair insertion direction end edge of the clamping arm tip side 29 (the reason the cross section is roughly trapezoidal is that the cross section consists of a plane and a curved surface, and the corner portion is curved).

[0136] The clamping surface 3 is supported so as to be able to move forward and backward as described above, and is biased by the second spring. Therefore, when the clamping surface 3 is retracted, the hair wrapped around either the upper or lower curl-forming curved surface extends linearly from both of these curl-forming curved surfaces and contacts the corresponding curved surface of the wrapping surface. On the wrapping surface side, it is also possible to set it so that the linearly extended hair directly contacts a flat surface.

[0137] Furthermore, with the above configuration, at least one of the hair insertion edge edges of the heating section is provided with a curl-forming curved surface that curves in the thickness direction of the heating section, and at least one of the hair insertion edge edges of the clamping arm tip side 29 is provided with a winding surface having a curved or flat surface for winding the hair, and the hair wound around the curl-forming curved surface extends linearly from the curl-forming curved surface and contacts the curved or flat surface of the winding surface.

[0138] Furthermore, when the clamping surface 3 is retracted, the hair wrapped around the curl-forming curved surface of the lower base extends linearly from the curl-forming curved surface of the lower base and comes into contact with the curved or flat surface of the wrapping surface of the lower base.

[0139] Next, we will explain how to use the aforementioned hair iron to straighten curly hair or correct artificial permanent waves.

[0140] First, when using the hair iron, the hair is first coated with a first agent, which is an aqueous solution mainly composed of mercapto compounds (reducing agents) such as thioglycolic acid and cysteine, to which basic substances such as ammonia, monoethanolamine, and triethanolamine are added to adjust the pH to 6-10. This coating reduces the disulfide bonds of cystine contained in the keratin protein in the hair, cleaving them into mercapto groups. After that, the hair is washed with water, dried sequentially with a hairdryer, etc., and then straightened using a hair iron heated to 140-180°C.

[0141] Specifically, the user grips the gripping parts 21 and 23 of the clamping arm, applies force by placing the thumb and index finger on the force application points 25 and 27, and clamps the hair between the heated parts of the clamping surfaces 3 and 4. Then, while maintaining this position, the user slides the clamping arm down to the ends of the hair. As a result, the hair, clamped between the heated parts heated by the ceramic heater, is heated and straightened.

[0142] At this time, the hair moves at a predetermined speed between the magnetic plates with their south poles facing each other, and according to Fleming's right-hand rule, reduction energy is generated. This energy is generated by electrons from the magnetic poles of the clockwise rotating magnetic plates, promoting the reduction action of the first solution. Moreover, it also works to close the cuticle that forms the outer layer of the hair. When the cuticle is closed, it blocks ultraviolet rays from penetrating into the hair, thus preventing the hair from being damaged by ultraviolet rays.

[0143] Furthermore, this reduction energy reduces the size of the water clusters in the first solution. This reduction in cluster size increases the penetration of the first solution into the hair. As a result, the reducing action of the first solution is further promoted. Consequently, the treatment time, which carries the risk of damaging the hair, can be shortened, and hair damage can be suppressed.

[0144] Subsequently, a second solution consisting of an aqueous solution of an oxidizing agent such as sodium bromate and hydrogen peroxide is applied to the hair. As a result, the mercapto groups are oxidized, new disulfide bonds are generated in the hair, and this straight hair state can be fixed.

[0145] Next, we will explain how to create permanent waves using a hair iron.

[0146] The gripping action of the hair by the gripping surfaces 3 and 4 is the same as described above. When applying a permanent wave, the hair is pressed against the curl-forming curved surface of the upper or lower base portion as described above. Therefore, while the hair is gripped by the gripping surfaces 3 and 4, the iron body is rotated and the hair is wrapped around the tip side 29 or 31.

[0147] As a result, for example, when hair is wrapped around one of the curl-correcting curved surfaces of the heating section, the hair begins to wrap around the curl-forming curved surface from its starting point to its end point, following the curved surface.

[0148] From the endpoint of the curl-forming curved surface, the hair extends linearly and touches the flat side of the curved surface where it wraps. The hair that touches the curl-forming surface at a point then wraps around the flat surface and the winding curved surface in sequence. In other words, on the rounded bottom portion of the roughly trapezoidal shape, it is possible for the hair to wrap around from the curl-forming curved surface → the curved surface of the winding surface → the flat portion → the winding curved surface.

[0149] Therefore, when setting curls, sufficient curl setting can be achieved by ensuring the hair is in sufficient contact with the curl-forming curved surface. Moreover, when tension is applied to the hair by wrapping it around the gripping arm and attempting to press the hair against the curl-forming curved surface, the hair can easily slide along the curved and flat surfaces of the wrapping surface on the gripping arm side. Therefore, the tension applied to the hair by wrapping can be effectively utilized to press it against the curl-forming curved surface, enabling sufficient curl setting.

[0150] The flat surface of the bottom portion is perpendicular to the straightening surface, and since the protruding positions of this flat surface and the curl-forming curved surface are close in the direction of hair insertion, the tension applied to the hair by wrapping can be used more smoothly as a pressing force against the curl-forming curved surface by allowing the flat surface of the wrapping surface to slide more smoothly, thereby making it possible to set curls more reliably and easily.

[0151] The pressing force of the hair against the curl-forming curved surface can be generated by winding it onto the winding curved surface. Because the flat surface is long and the distance between the winding curved surface and the curl-forming curved surface is large, a relatively large pressing force can be applied to the hair against the curl-forming curved surface by the rotation of the gripping arm. This also makes it possible to set curls more reliably and easily.

[0152] Next, when hair is wrapped around the other curl-correcting curved surface of the heating section (the curl-correcting curved surface of the rounded, roughly trapezoidal upper base), the hair begins to wrap around the other curl-forming curved surface from its starting point and continues to wrap around the other curl-forming curved surface up to its midpoint.

[0153] From the midpoint of the other curl-forming curved surface, the hair extends in a straight line and makes contact with the curved surface of the winding surface at the upper bottom portion. At this point, the hair that is in contact with the curved surface of the winding surface at the upper bottom portion is sequentially wound onto the winding guide surface on the opposite side of the heating section.

[0154] Therefore, when curling the hair using the curl-forming surface of the upper base, the hair comes into contact with the curl-forming surface of the upper base up to the midpoint of its curvature, allowing for a looser curl than that created by the curl-forming surface of the lower base. In other words, by varying the degree to which the hair wraps around both the upper and lower curl-forming surfaces, it becomes easy to create curls with different variations.

[0155] Furthermore, when applying tension to the hair by wrapping it around the gripping arm and attempting to press the hair against the curl-forming curved surface of the upper base, the hair can be easily slid along the curved surface of the wrapping surface and the winding guide surface of the upper base on the gripping arm side. Therefore, the tension applied to the hair by wrapping can be effectively utilized to press it against the curl-forming curved surface of the upper base, ensuring that curls are set properly.

[0156] Furthermore, in this embodiment, since the curl-forming curved surfaces of the upper and lower bottom portions of the heating section do not protrude beyond the winding surfaces of the upper and lower bottom portions, which are the hair insertion edges of the gripping arm, it is possible to prevent the heating section from touching the person being treated during the procedure.

[0157] However, the heating element can also be configured to protrude beyond the winding surfaces of the upper and lower bottom portions, which are the hair insertion edges of the gripping arm. In this case, for example, the heating element is provided with a curl-forming curved surface on one or both of its hair insertion edges (upper or lower bottom portion) that curves in the thickness direction of the heating element. This curl-forming curved surface protrudes beyond the hair insertion edge of the gripping arm. This curl-forming curved surface is formed over the entire thickness direction of the heating element and can, for example, exhibit a 1 / 2 arc.

[0158] Corresponding to the curl-forming curved surface of the upper or lower base portion, a curved or flat winding surface for winding hair can be provided at the hair insertion edge of the tip side 29 of the clamping arm.

[0159] The winding surface of the upper or lower base portion has a curved surface that is curved in the same direction as the curl-forming curved surface. The winding surface of the upper or lower base portion has a flat surface that is continuous with the curved surface of the upper or lower base portion. This flat surface is set at an acute angle with respect to the straightening surface. The winding surface of the upper or lower base portion has a winding curved surface that is continuous with the flat surface on the side opposite to the straightening surface.

[0160] When hair is wrapped around the curl-forming curved surface of the upper or lower bottom portion of the heating section, the hair begins to wrap around the curl-forming curved surface from the starting point of the upper or lower bottom portion and continues to wrap around to the other side of the curl-forming curved surface.

[0161] Hair extends linearly from a point on the curl-forming curved surface of the upper or lower base portion and touches the plane of the winding surface at a point. The hair that touches the winding surface at a point on the plane then sequentially winds around the plane that is continuous with the winding surface.

[0162] Therefore, when curling is performed using the curl-forming curved surface of the upper or lower base portion, the hair can be in contact with the curl-forming curved surface of the upper or lower base portion for more than 1 / 4 arc length, and a steeper curl can be created than with the curl-forming curved surface alone. Furthermore, by combining the two curl-forming curved surfaces, it is possible to easily create curls with different variations.

[0163] Furthermore, when tension is applied to the hair by wrapping it around the gripping arm and attempting to press the hair against the curl-forming curved surface of the upper or lower base, the hair can be easily slid along the flat surface of the wrapping surface on the gripping arm side. Therefore, the tension applied to the hair by wrapping can be effectively utilized to press it against the curl-forming curved surface, ensuring that curls are set properly.

[0164] It should be noted that the present invention is not limited to the above embodiments. For example, one or both of the clamping surfaces 3 and 4 can be fixed in place and cannot move relative to the tip sides 29 and 31. The magnetic plate, first spring, etc., can also be omitted.

[0165] We investigated whether hydrogen peroxide could actually be removed using this type of hair iron.

[0166] <Decomposition temperature of hydrogen peroxide> Approximately 1g of 100% human white hair (product number: BM-WA, manufactured by Beaulux) was bleached to create an evaluation hair bundle with residual hydrogen peroxide inside the hair. The decomposition temperature of hydrogen peroxide inside the hair was determined using the following method, and this temperature was defined as the "hydrogen peroxide removal mode".

[0167] <Measurement of hydrogen peroxide concentration at ironing temperatures> Mix Bleach Agent 1 from Formulation Example 1 and Bleach Agent 2 from Formulation Example 2 in a 1:1 ratio until uniform, apply to hair strands, and leave at room temperature for 30 minutes. Then, rinse with warm water, wash with our Oolong Shampoo (product name: Nano Supplement Cleansing Shampoo OT), rinse with warm water, and dry with a hairdryer. Next, pass the hair strands through the hair iron of the present invention three times, set to 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, and 180°C. After that, wet each hair strand with water, and press hydrogen peroxide concentration test paper (Mitsubishi Gas Chemical Trading Co., Ltd.: Hydrogen Peroxide Concentration Test Paper) against the ends, middle, and roots of the hair strands for 5 seconds to visually measure the concentration and measure the color using a spectrophotometer. Table 1 shows Formulation Example 1 (Bleach Agent 1). Table 2 shows Formulation Example 2 (Bleach Agent 2).

[0168] [Table 1]

[0169] [Table 2]

[0170] <Determination of hydrogen peroxide decomposition temperature in hair irons> Next, the hydrogen peroxide concentration test strips were visually inspected and the results are shown in Table 3.

[0171] [Table 3]

[0172] The L*a*b* color space was measured using a hydrogen peroxide concentration test strip with a spectrophotometer (model: CM-36dG, manufactured by Konica Minolta), and the results are shown in Table 4 and Figure 1. The hydrogen peroxide concentration test strip turns bluer at higher hydrogen peroxide concentrations. Therefore, when measured with a spectrophotometer, a lower b* value indicates a higher hydrogen peroxide concentration. From Tables 3 and 4, temperatures above 150°C, where the hydrogen peroxide concentration decreases significantly, are appropriate. For this reason, the "hydrogen peroxide removal" mode can be set to 150°C.

[0173] [Table 4]

[0174] As a result, it was found that it is possible to efficiently reduce hydrogen peroxide while operating a hair iron, thereby minimizing damage to the hair.

[0175] While the description above shows a hair iron with an asymmetrical design, the shape can be modified depending on the intended use. For example, a straightener can be made symmetrical. [Explanation of Symbols]

[0176] 1. First Arm 2. Second Arm 3. First clamping surface 4. Second clamping surface 5. Hydrogen peroxide reduction device 6. Temperature control device 7. Connecting Members 8. Connecting Members 9 switches 15,17 Proximal end 19 Rotation axis 21,23 Gripping part 25,27 Point of force 29,31 Tip side 33 One side of the tip, 29, 31 35 One side of the gripping parts 21, 23 37 Both sides 33,35 are inclined surfaces 39 Other surfaces of the tip sides 29, 31 50 Core material 51 Plates and others 60 Plate (Heating Section) 61. Ceramic heater (heat source) 62 Mica plate 63 Bimetal 64 Bimetal presser foot 65. Leaf spring for holding magnets 66 Plate spring (biasing part) 67 Magnets

Claims

1. A first arm and a second arm are connected so as to be openable and closable, A first clamping surface provided on the inside of the first arm, A second clamping surface provided on the inside of the second arm, A hair iron having heating sections for heating hair provided on the first and second clamping surfaces, wherein the heating section has a layer made of at least platinum, the platinum layer is located on the outermost surface of the heating section, and a nickel-copper-nickel layer is located beneath the platinum layer.

2. The hair iron according to claim 1, characterized in that the heating element further has a layer made of at least one of nickel, copper, electroless nickel, or aluminum.

3. The hair iron according to claim 1 or 2, characterized in that the thickness of the platinum layer is 0.05 to 1.0 μm.

4. The hair iron according to claim 1 or 2, characterized in that the surface of the heating element is buffed.

5. The hair iron according to claim 1 or 2, characterized in that the first and / or second arm is equipped with a hydrogen peroxide reduction device.

6. Furthermore, the hair iron according to claim 1 or 2 is characterized in that the first and / or second arm is provided with a temperature control device.

7. The hair iron according to claim 5, characterized in that the hydrogen peroxide reduction device reduces hydrogen peroxide by setting a temperature.

8. The hair iron according to claim 7, characterized in that the temperature is 80°C or higher.

9. The hair iron according to claim 7, characterized in that the temperature is 140°C to 180°C.

10. Furthermore, the hair iron according to claim 1 or 2 is characterized by having a connecting member that connects the first arm and the second arm.

11. The hair iron according to claim 1 or 2, characterized in that the hydrogen peroxide reduction device and temperature control device provided on the first and / or second arm are integrated.

12. The hair iron according to claim 11, characterized in that the first and / or second arm is provided with switches for the hydrogen peroxide reduction device and the temperature control device.

13. The hair iron according to claim 10, characterized in that the connecting member is one or more.

14. The hair iron according to claim 1 or 2, characterized in that the first and / or second arm has a biasing portion that biases the clamping surface and elastically adjusts the clamping state between the clamping surfaces.

15. The hair iron according to claim 1 or 2, characterized in that the first and / or second arms have a core material installed along their longitudinal direction.

16. The hair iron according to claim 15, characterized in that the core material has a stopper portion that engages with the clamping surface and restricts movement in the protruding direction relative to the first and / or second arm.

17. The hair iron according to claim 1, characterized in that at least one of the edges of the heating portion in the hair insertion direction has a curl-forming curved surface that is curved in the thickness direction of the heating portion.

18. The hair iron according to claim 1, characterized in that the first arm and / or the second arm have curved surfaces at their tip ends in the hair insertion direction.

19. Furthermore, the hair iron according to claim 1 or 2 is characterized in that at least one of the hair insertion edge edges of the heating portion has a plane continuous with both the curl-forming curved surface that curves in the thickness direction of the heating portion and the curved surface present on the hair insertion edge on the tip side of the first arm and / or the second arm.

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