Hair straightener with hair thickness detection and temperature adjustment functions

Abstract

The invention discloses a hair straightener with functions of hair thickness detection and temperature adjustment, which comprises an upper hairpin, a lower hairpin and a control circuit, and is characterized in that an upper clamping piece is arranged on the upper hairpin; a lower clamping piece is arranged on the lower hairpin, and an inductor is further arranged on the upper hairpin or the lower hairpin; the control circuit obtains the clamping angle of the upper hairpin and the lower hairpin through the inductor so as to obtain hair thickness information through the clamping angle, and the temperature of the upper clamping piece and the temperature of the lower clamping piece are controlled to be the temperature corresponding to the hair thickness information. Therefore, when the hair is straightened, proper temperature can be automatically adjusted and output according to the thickness of the hair; the condition that hair is damaged due to the fact that the temperature of the upper clamping piece and the temperature of the lower clamping piece are improper in the using process can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of hair straighteners, and particularly to a hair straightener with hair thickness detection and temperature adjustment. Background Art

[0002] The clamping hair straightener is a commonly used household item. When in use, to straighten the hair, a lock of hair is inserted into the hair straightener, and the hair is clamped between two heating plates. Through the clamping force, the two heating plates of the hair straightener are pressed against each other, and the clamping force squeezes the hair between the two plates. The user straightens the hair by pulling force.

[0003] In the prior art, when using the clamping hair straightener, the user may lack experience and not know the information about the thickness of the hair and the thickness of the clamped hair. When using it for the first time, the temperature usually set does not match the hair thickness, and the hair may be damaged due to too high temperature during hair straightening. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, an object of the present invention is to provide a hair straightener with hair thickness detection and temperature adjustment.

[0005] To achieve the above object, according to an embodiment of the present invention, the hair straightener with hair thickness detection and temperature adjustment includes:

[0006] An upper hairpin, on which an upper clamping piece is provided;

[0007] A lower hairpin, on which a lower clamping piece is provided, and a sensor is further provided on the upper hairpin or the lower hairpin;

[0008] A control circuit, which obtains the clamping angle of the upper hairpin and the lower hairpin through the sensor to obtain the hair thickness information based on the clamping angle, and controls the temperatures of the upper clamping piece and the lower clamping piece at a temperature corresponding to the hair thickness information.

[0009] Further, according to an embodiment of the present invention, the sensor is a linear sensor.

[0010] Further, according to an embodiment of the present invention, the sensor includes any one or more of a Hall sensor, an optocoupler sensor, an infrared sensor, or a touch switch.

[0011] Further, according to an embodiment of the present invention, the hair straightener with hair thickness detection and temperature adjustment further includes a magnet, the inductor is a linear Hall inductor, one of the upper hairpin or the lower hairpin is provided with the linear Hall inductor, and the other of the upper hairpin or the lower hairpin is provided with the magnet at a position opposite to the Hall inductor.

[0012] Further, according to an embodiment of the present invention, the control circuit includes:

[0013] A controller;

[0014] An induction circuit, the inductor is electrically connected to the controller through the induction circuit respectively, and the controller is used to obtain the opening and closing states of the upper hairpin and the lower hairpin through the inductor;

[0015] A heating circuit, the heating circuit is connected to the controller to control the temperature of the upper clamping piece and the lower clamping piece under the control of the controller.

[0016] Further, according to an embodiment of the present invention, the heating circuit includes:

[0017] A first heater;

[0018] A second heater, one end of the first heater and one end of the second heater are respectively connected to one end of the power supply;

[0019] A semiconductor switch, the first connection end of the channel of the semiconductor switch is respectively connected to the other end of the first heater and the other end of the second heater, the second connection end of the channel of the semiconductor switch is connected to the other end of the power supply, and the controlled end of the semiconductor switch is connected to the heating control signal output end of the controller; wherein, the first heater is used to heat up the upper clamping piece, and the second heater is used to heat up the lower clamping piece.

[0020] Further, according to an embodiment of the present invention, the control circuit further includes:

[0021] A voltage detection circuit, the voltage detection circuit is connected to the controller, the controller detects the voltage of the power supply through the voltage detection circuit, and the controller also controls the heating of the first heater and the second heater according to the voltage of the power supply.

[0022] Further, according to an embodiment of the present invention, the control circuit further includes:

[0023] Button control circuit, the button control circuit includes a control button, the control button is connected to the controller to send a control signal to the controller, and the controller also controls the heating of the first heater and the second heater according to the control signal.

[0024] The hair straightener with hair thickness detection and temperature adjustment provided by the embodiment of the present invention has an upper clip on the upper hairpin; a lower clip on the lower hairpin, and a sensor is also provided on the upper hairpin or the lower hairpin; the control circuit obtains the closing angle of the upper hairpin and the lower hairpin through the sensor, so as to obtain hair thickness information through the closing angle, and control the temperatures of the upper clip and the lower clip at temperatures corresponding to the hair thickness information. In this way, when straightening hair, the output temperature can be automatically adjusted according to the thickness of the hair; it can avoid the situation of damaging hair due to inappropriate temperatures of the upper clip and the lower clip during use. Description of the Drawings

[0025] Figure 1 It is a schematic diagram of the open state of the upper hairpin and the lower hairpin and the partial sectional structure at A of the hair straightener with hair thickness detection and temperature adjustment provided by the present invention;

[0026] Figure 2 It is Figure 1 the partial enlarged structure schematic diagram of A;

[0027] Figure 3 It is a schematic diagram of the open state of the upper hairpin and the lower hairpin and the partial sectional structure at B of the hair straightener with hair thickness detection and temperature adjustment provided by the present invention;

[0028] Figure 4 It is Figure 3 the partial enlarged structure schematic diagram of B;

[0029] Figure 5 It is a schematic diagram of the control circuit structure provided by the present invention;

[0030] Figure 6 It is another schematic diagram of the open state structure of the hair straightener with hair thickness detection and temperature adjustment provided by the present invention;

[0031] Figure 7 It is a linear relationship diagram between the output voltage and the magnetic field intensity of the linear Hall effect sensor provided by the present invention.

[0032] Reference Signs

[0033] Upper hairpin 10;

[0034] Upper clip 101;

[0035] Lower hairpin 20;

[0036] Lower clamping piece 201;

[0037] Inductor 30;

[0038] Magnet 40;

[0039] Temperature increase / decrease gear button 50.

[0040] The realization, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0041] In order to enable those skilled in the art of this technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0042] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] Refer to Figures 1 to 5, an embodiment of the present invention provides a hair straightener with hair thickness detection and temperature adjustment, including: an upper hairpin 10, a lower hairpin 20, and a control circuit. An upper clip 101 is provided on the upper hairpin 10; a lower clip 201 is provided on the lower hairpin 20, and a sensor 30 is further provided on the upper hairpin 10 or the lower hairpin 20; the control circuit is configured to obtain the opening and closing states of the upper hairpin 10 and the lower hairpin 20 through the sensor 30, and control the temperatures of the upper clip 101 and the lower clip 201 according to the opening and closing states of the upper hairpin 10 and the lower hairpin 20. The control circuit may be provided with a controller to obtain the detection signal of the sensor and control the temperatures of the upper clip 101 and the lower clip 201 through the controller. In this way, the control circuit can dynamically control the temperatures of the upper clip 101 and the lower clip 201, maintain appropriate temperatures for the upper clip 101 and the lower clip 201 during hair straightening, and reduce the damage to hair roots caused by high temperatures; at the same time, a better hair straightening effect can be achieved. The control circuit obtains the closing angle of the upper hairpin 10 and the lower hairpin 20 through the sensor 30, so as to obtain hair thickness information based on the closing angle and control the temperatures of the upper clip 101 and the lower clip 201 at temperatures corresponding to the hair thickness information (closing angle). In this embodiment, after the control circuit detects that the upper hairpin 10 and the lower hairpin 20 are in the closed state, it can automatically adjust the temperatures of the upper clip 101 and the lower clip 201 according to the size of the closing angle. To meet the heating requirements for different thicknesses of hair during hair straightening. For example, during use, the control circuit further obtains the hair thickness information clamped between the upper clip 101 and the lower clip 201 according to the closing angle, and controls the temperatures of the upper hairpin 10 and the lower hairpin 20 at temperatures corresponding to the hair thickness information; wherein, the greater the hair thickness clamped between the upper clip 101 and the lower clip 201, the higher the heating temperature of the upper hairpin 10 and the lower hairpin 20. In this way, it can be ensured that during hair straightening, an appropriate temperature can be output according to the hair thickness, and the situation of damaging hair due to inappropriate temperatures of the upper clip 101 and the lower clip 201 during use can be avoided. In this way, by detecting the user's hair thickness, it is automatically adjusted to a temperature gear suitable for a specific user, helping the user reduce the situation of damaging hair caused by pulling hair at the wrong temperature.

[0044] Specifically, when different hair thicknesses need to be distinguished, during product design, different thicknesses of hair can be placed in the hair straightener clips and closed first. A linear sensor can be used to obtain the voltage values corresponding to different hair thicknesses output by different gear sensors (such as a linear Hall effect sensor 30), and store them in the controller. When the user uses the hair straightener, the controller compares the voltage value output by the sensor collected with the voltage value stored in the chip, and then the thickness of the hair can be judged.

[0045] Preferably, in an embodiment of the present invention, the hair straightener with hair thickness detection and temperature adjustment further includes a magnet 40, the inductor 30 is a linear Hall inductor 30, one of the upper hairpin 10 or the lower hairpin 20 is provided with the linear Hall inductor 30, and the other of the upper hairpin 10 or the lower hairpin 20 is provided with the magnet 40 at a position opposite to the linear Hall inductor 30.

[0046] A linear Hall effect sensor, whose output signal level depends on the magnetic field strength applied to the sensitive surface of the device and changes proportionally with the magnetic field strength (as shown in Figure 6 ). When it is under zero magnetic field conditions, the output voltage is half of its power supply voltage. When the S pole appears on the marked surface, the output voltage will linearly increase with the increase of the magnetic field strength; on the contrary, the N pole will cause the output voltage to linearly decrease with the increase of the magnetic field strength. Utilizing this characteristic of the linear Hall effect sensor, a Hall sensor assembly and a magnetic component are respectively installed at the relative positions of the upper and lower clips of the hair straightener when they are opened and closed. When pulling hair, the thickness of the hair is different, resulting in different closing degrees of the upper and lower clip pieces 201, and the distances between the magnetic component and the Hall sensor assembly are also different. The magnetic fluxes sensed by the Hall sensor assembly are different. The Hall sensor assembly converts the sensed magnetic fluxes into corresponding voltage outputs. By measuring the voltage value output by the Hall sensor assembly with the MCU signal detection pin, the thickness of the hair can be determined. For example: (When assembling the S pole of the magnet 40 facing the Hall effect sensor) When the hair straightener is fully opened, the upper and lower clip pieces 201 are far apart, and the magnetic flux sensed by the Hall effect sensor is almost zero. At this time, the output of the Hall effect sensor is 2.5V. When the hair straightener is closed, the magnet 40 gradually approaches the Hall effect sensor. At this time, the output of the Hall effect sensor changes between 2.5V and 4V. The closer the distance, the higher the voltage.

[0047] When it is necessary to distinguish different hair thicknesses, during product design, different thicknesses of hair can be placed in the clip of the hair straightener and closed to obtain the voltage values corresponding to the hair thicknesses output by the Hall effect sensor at different gears and store them in the MCU. When the user uses the hair straightener, the MCU compares the voltage value output by the Hall effect sensor collected with the voltage values stored in the chip, and then the thickness of the hair can be determined.

[0048] Among them, in other embodiments, the inductor 30 can also be any one or more of an optocoupler sensor, an infrared sensor, or a touch switch. It should be noted that in some other embodiments of this usage information, other sensors not listed can be adopted according to the actual needs of the application, and they will not be elaborated one by one here.

[0049] Refer to Figure 5, the control circuit includes: a controller, an induction circuit, and a heating circuit. The inductor 30 is electrically connected to the controller through the induction circuit. The controller is configured to obtain the open / closed clip state of the upper hairpin 10 and the lower hairpin 20 through the inductor 30. The heating circuit is connected to the controller to control the temperature of the upper clip 101 and the lower clip 201 under the control of the controller.

[0050] As Figure 5 shown, wherein, the induction circuit may include an inductor U3 (30). The power supply terminal and the ground terminal of the inductor U3 (30) may be connected through a capacitor C14 to ensure the stability of the power supply of the inductor U3 (30). The signal detected and output by the inductor U3 (30) is output to the detection terminal of the controller U1 through a resistor R12, so that the controller U1 can obtain the included angle information between the upper hairpin 10 and the lower hairpin 20.

[0051] As Figure 5 shown, the heating circuit includes: a first heater Hearter1, a second heater Hearter2, and a semiconductor switch. One end of the first heater Hearter1 and one end of the second heater are respectively connected to one end of the power supply. The first connection end of the channel of the semiconductor switch is respectively connected to the other end of the first heater and the other end of the second heater Hearter2. The second connection end of the channel of the semiconductor switch is connected to the other end of the power supply. The controlled end of the semiconductor switch is connected to the heating control signal output end of the controller. Wherein, the first heater Hearter1 is used to heat up the upper clip 101, and the second heater Hearter2 is used to heat up the lower clip 201.

[0052] The working process of the heating circuit is as follows. When the controller U1 needs to control the heating of the upper clamping piece 101 and the lower clamping piece 201, a trigger signal can be output to the semiconductor switch through the resistor R30, the diode D3 and the resistor R26. Among them, the semiconductor switch can be a triac or a silicon controlled rectifier. In this embodiment, the triac TRIAC1 is used for illustration. Under the action of the trigger signal of the controller, the control terminal of the triac TRIAC1 can control the conduction of the two-channel at both ends of the triac TRIAC1, so that the circuits of the parallel-connected first heater Hearter1 and the second heater Hearter2 are conducted. The first heater Hearter1 and the second heater Hearter2 generate heat and respectively heat the upper clamping piece 101 and the lower clamping piece 201. In this way, the upper clamping piece 101 and the lower clamping piece 201 can be heated under the control of the controller. Among them, the heating circuit may further include a current detection circuit for detecting the current on the heating circuit. Among them, the current detection circuit includes a resistor R29, and the resistor R29 is connected in series on the heating circuit to detect the current of the circuit and transmit the collected current information to the controller through the resistor R28. The capacitor C8 can filter out the interference signals in the current detection signal. In addition, a resistor R19 and a capacitor C10 may also be included. The resistor R19 and the capacitor C10 are connected in parallel between the control terminal of the triac TRIAC1 and the second connection terminal T2 of the channel of the triac TRIAC1. The capacitor 10 can filter out the interference signals in the control terminal of the triac TRIAC1. The resistor R19 can provide a pull-down low level for the control terminal of the triac TRIAC1.

[0053] Refer to Figure 5 , the control circuit further includes: a voltage detection circuit, the voltage detection circuit is connected to the controller, the controller detects the voltage of the power supply through the voltage detection circuit, and the controller also controls the heating of the first heater and the second heater according to the voltage of the power supply. As Figure 5 shown in, the voltage detection circuit may include a resistor R24 and a resistor R25. One end of the resistor R24 is connected to one end of the input power supply, the other end of the resistor R24 is connected to one end of the resistor R25, and the other end of the resistor R25 is connected to the other end of the input power supply; a voltage dividing circuit is formed between the resistor R24 and the resistor R25 to divide the input power supply and then input it to the voltage detection terminal of the controller. In this way, the controller can obtain the voltage of the input power supply and output a corresponding pulse width signal according to the magnitude of the input voltage to control the power of the first heater Hearter1 and the second heater Hearter2. Thus, the heating and temperature rise of the upper clamping piece 101 and the lower clamping piece 201 can be better controlled.

[0054] Referring to Figure 5 , the control circuit further includes: a key control circuit, the key control circuit includes a control key, the control key is connected to the controller to send a control signal to the controller, and the controller also controls the heating of the first heater and the second heater according to the control signal. The key signal can be input to the key detection end of the controller through the control key. In this way, the controller can obtain the corresponding control signal and output the corresponding pulse width signal according to the control signal to control the power of the first heater Hearter1 and the second heater Hearter2. Thus, the heating and temperature rise of the upper clamping piece 101 and the lower clamping piece 201 can be better controlled.

[0055] Referring to Figure 5 , the control circuit further includes: a voltage conversion circuit, and the input power supply can be converted into the power supply VCC for the controller, the inductor 30 and the key control circuit through the voltage conversion circuit.

[0056] Referring to Figure 6 , the automatic temperature control hair straightener provided by the embodiment of the present invention may also be provided with a plurality of keys. For example, temperature increase and decrease gear keys and a switch key. Among them, the temperature increase and decrease gear keys control the increase or decrease of the temperature of the upper clamping piece 101 and the lower clamping piece 201. The switch key controls the on / off of the automatic temperature control hair straightener. The automatic temperature control hair straightener may also be provided with an LED indicator light and an LED lamp cover, and the working state of the hair straightener can be indicated through the LED indicator light through the LED lamp cover.

[0057] The above are only the embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements for some of the technical features. Any equivalent structure directly or indirectly using the content of the specification and drawings of the present invention in other related technical fields is similarly within the scope of the patent protection of the present invention.

[0058] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0059] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Without departing from the principles and spirit of the present invention, those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and all are within the protection scope of the present invention.

Claims

1. A hair straightener with hair thickness detection and temperature regulation, characterized in that: include: An upper hairpin, wherein an upper clip is provided on the upper hairpin; A lower hairpin, wherein the lower hairpin is provided with a lower clamping piece, and the upper hairpin or the lower hairpin is also provided with a sensor; A control circuit, wherein the control circuit obtains the clamping angle of the upper hairpin and the lower hairpin through the sensor, obtains the hair thickness information through the clamping angle, and controls the temperature of the upper clip and the lower clip to a temperature corresponding to the hair thickness information.

2. The hair straightener with hair thickness detection and temperature regulation according to claim 1, characterized in that: The sensor is a linear sensor.

3. The hair straightener with hair thickness detection and temperature regulation according to claim 2, characterized in that: The sensor includes any one or more of a Hall sensor, an optical coupling sensor, an infrared sensor or a touch switch.

4. The hair straightener with hair thickness detection and temperature regulation according to claim 3, characterized in that: It also includes a magnet, the sensor is a linear Hall sensor, one of the upper hairpin or the lower hairpin is provided with the linear Hall sensor, and the other of the upper hairpin or the lower hairpin is provided with the magnet at a position opposite to the Hall sensor.

5. The hair straightener with hair thickness detection and temperature regulation according to any one of claims 1 to 4, characterized in that: The control circuit comprises: Controller; A sensing circuit, wherein the sensor is electrically connected to the controller through the sensing circuit, and the controller is used to obtain the opening and closing states of the upper hairpin and the lower hairpin through the sensor; A heating circuit is connected to the controller to control the temperature of the upper clamp and the lower clamp under the control of the controller.

6. The hair straightener with hair thickness detection and temperature regulation according to claim 5, characterized in that: The heating circuit comprises: a first heating element; A second heater, wherein one end of the first heater and one end of the second heater are respectively connected to one end of a power supply; A semiconductor switch, wherein the first connection end of the channel of the semiconductor switch is respectively connected to the other end of the first heater and the other end of the second heater, the second connection end of the channel of the semiconductor switch is connected to the other end of the power supply, and the controlled end of the semiconductor switch is connected to the heating control signal output end of the controller; wherein the first heater is used to heat the upper clamp, and the second heater is used to heat the lower clamp.

7. The hair straightener with hair thickness detection and temperature regulation according to claim 6, characterized in that: The control circuit further comprises: A voltage detection circuit is connected to the controller, and the controller detects the voltage of the power supply through the voltage detection circuit. The controller also controls the heating of the first heater and the second heater according to the voltage of the power supply.

8. The hair straightener with hair thickness detection and temperature regulation according to claim 6 or 7, characterized in that: The control circuit further comprises: A button control circuit includes a control button, and the control button is connected to the controller to send a control signal to the controller. The controller also controls the heating of the first heater and the second heater according to the control signal.

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