Depilating method and device

Abstract

The application relates to a hair removal method and device. The method comprises: performing identification measurement on a hair follicle to obtain hair follicle feature information including hair diameter, hair follicle depth and hair follicle ball diameter, and judging the hair follicle type according to the hair follicle feature information; in the case of the hair follicle type being a terminal hair follicle, setting the output energy density and pulse width as a first energy density and a first pulse width respectively; in the case of the hair follicle being a vellus hair follicle, setting the energy density and pulse width as a second energy density and a second pulse width respectively; in the case of neither being a terminal hair follicle nor a vellus hair follicle, setting the energy density and pulse width as a third energy density and a third pulse width respectively; wherein the first energy density is greater than the third energy density which is greater than the second energy density, and the first pulse width is greater than the third pulse width which is greater than the second pulse width. By obtaining the hair follicle feature information, the output of light energy can be improved according to actual conditions for different hair follicle types, thereby improving the hair removal experience of users.

Description

Technical Field

[0001] This application relates to the fields of medical aesthetics and optical beauty instruments, and in particular to a hair removal method and device. Background Technology

[0002] Optical hair removal technology has been widely used in clinical and home beauty fields. Its principle is to use light energy of a specific wavelength that is selectively absorbed by the melanin in the hair shaft and hair follicle, generating a thermal effect that destroys the hair follicle tissue, thereby inhibiting hair growth.

[0003] Currently, hair removal devices on the market mainly employ the following methods for energy adjustment: First, manual mode, where the operator presets energy levels based on experience or skin type (such as the Fitzpatrick skin type), and the user selects the level themselves. This method relies too heavily on subjective judgment and is difficult to accurately match dynamically changing hair characteristics. Second, automatic adjustment based on skin tone sensors, which roughly adjusts the energy by detecting the color of the skin surface or the intensity of reflected light to avoid excessive damage to dark skin. However, this method cannot sense the depth of the hair follicle and the size of the hair follicle bulb. Third, fixed pulse mode, where the device comes pre-set with several fixed energy-pulse width combinations, and the user selects based on their sensation. This cannot achieve true personalization; coarse hair may not receive enough energy, resulting in poor results, while fine hair may receive excessive energy, causing pain or epidermal damage. Summary of the Invention

[0004] Therefore, it is necessary to provide a hair removal method and device to address the aforementioned technical problems.

[0005] A hair removal method, comprising:

[0006] The hair follicles in the target area are identified and measured to obtain hair follicle feature information, which includes hair diameter, hair follicle depth and hair follicle bulb diameter.

[0007] Based on the hair follicle feature information and preset logic, the energy density and pulse width of the output light source are set, and the light source is controlled to output according to the energy density and pulse width;

[0008] The step of setting the energy density and pulse width of the output light source based on hair follicle feature information and preset logic includes:

[0009] The hair follicle type is determined based on the described hair follicle characteristic information;

[0010] When the hair follicle type is terminal hair follicle, the energy density and pulse width are set as a first energy density and a first pulse width, respectively.

[0011] When the hair follicle type is vellus hair follicle, the energy density and pulse width are set as the second energy density and the second pulse width, respectively.

[0012] When none of the hair follicle types belong to the terminal hair follicle or the vellus hair follicle, the energy density and pulse width are set to the third energy density and the third pulse width, respectively.

[0013] Wherein, the first energy density is greater than the third energy density, the third energy density is greater than the second energy density, the first pulse width is greater than the third pulse width, and the third pulse width is greater than the second pulse width.

[0014] In another embodiment, the step of identifying and measuring hair follicles in the target area to obtain hair follicle feature information includes:

[0015] The diameter of the hair in the target region is obtained through image recognition;

[0016] The depth of the hair follicle and the diameter of the hair follicle bulb are obtained by ultrasonic detection.

[0017] In another embodiment, obtaining the hair follicle depth and hair follicle bulb diameter via ultrasonic detection includes:

[0018] Ultrasonic waves are emitted to the target area, and echo signals from different skin layers are received;

[0019] The hair follicle depth and hair follicle bulb diameter are measured by analyzing the time difference and waveform characteristics of the echo signal.

[0020] In another embodiment, determining the hair follicle type based on the hair follicle feature information includes:

[0021] If the hair diameter is greater than a hair diameter threshold, the hair follicle depth is between a first hair follicle depth threshold and a second hair follicle depth threshold, and the hair follicle bulb diameter is between a first hair follicle bulb diameter threshold and a second hair follicle bulb diameter threshold, then the hair follicle is determined to be a terminal hair follicle. In this case, the first hair follicle depth threshold is greater than the second hair follicle depth threshold, and the first hair follicle bulb diameter threshold is greater than the second hair follicle bulb diameter threshold.

[0022] If the hair diameter is less than a hair diameter threshold, the hair follicle depth is between a second hair follicle depth threshold and a third hair follicle depth threshold, and the hair follicle bulb diameter is between a second hair follicle bulb diameter threshold and a third hair follicle bulb diameter threshold, then the hair follicle is determined to be a vellus hair follicle. In this case, the second hair follicle depth threshold is greater than the third hair follicle depth, and the second hair follicle bulb diameter threshold is greater than the third hair follicle bulb diameter threshold.

[0023] In another embodiment, it further includes:

[0024] Detecting the hair growth cycle, which includes the anagen (growth) phase, telogen (resting) phase, or catagen (transitional) phase;

[0025] When the growth cycle is in the growth phase and the hair follicle type is terminal hair follicle, based on the first energy density and the first pulse width, the energy density and pulse width are increased and multiple pulse sequences are output.

[0026] If the growth cycle is in a resting or regressing phase, reduce the energy density and pulse width or stop the output.

[0027] A hair removal device, comprising:

[0028] The feature acquisition module is used to identify and measure hair follicles in the target area and acquire hair follicle feature information, including hair diameter, hair follicle depth and hair follicle bulb diameter.

[0029] An analysis module, connected to the feature acquisition module, is used to determine the hair follicle type based on the hair follicle feature information;

[0030] The control module is connected to the analysis module and is used to set the energy density and pulse width of the output light source according to the hair follicle type and preset logic, and control the light source to output according to the energy density and pulse width.

[0031] The step of setting the energy density and pulse width of the output light source according to the hair follicle type and preset logic includes:

[0032] When the hair follicle type is terminal hair follicle, the energy density and pulse width are set as a first energy density and a first pulse width, respectively.

[0033] When the hair follicle type is vellus hair follicle, the energy density and pulse width are set as the second energy density and the second pulse width, respectively.

[0034] When none of the hair follicle types belong to the terminal hair follicle or the vellus hair follicle, the energy density and pulse width are set to the third energy density and the third pulse width, respectively.

[0035] Wherein, the first energy density is greater than the third energy density, the third energy density is greater than the second energy density, the first pulse width is greater than the third pulse width, and the third pulse width is greater than the second pulse width.

[0036] In another embodiment, the light source is a laser light source and / or a high-intensity pulsed light source.

[0037] In another embodiment, the feature acquisition module includes:

[0038] An image recognition unit is used to obtain the hair diameter in the target area through image recognition;

[0039] An ultrasonic detection unit is used to obtain the hair follicle depth and hair follicle bulb diameter through ultrasonic detection.

[0040] In another embodiment, it further includes:

[0041] The growth cycle detection module is used to detect the growth cycle of hair, which includes the anagen (growth) phase, telogen (resting) phase, or catagen (regression) phase.

[0042] The hair removal method and apparatus of this application, by acquiring hair diameter, hair follicle depth and hair follicle bulb diameter as hair follicle characteristic parameters, can output light energy according to the actual situation for different hair follicles. This avoids the situation where using the same light energy parameters for different types of hair follicles leads to poor hair removal effect due to insufficient light energy, or skin overheating or pain due to excessive light energy, thus improving the user's hair removal experience. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is one of the flowcharts illustrating a hair removal method in one embodiment;

[0045] Figure 2 This is a second schematic flowchart of a hair removal method in one embodiment;

[0046] Figure 3 This is the third flowchart of a hair removal method in one embodiment;

[0047] Figure 4 This is a fourth flowchart illustrating a hair removal method in one embodiment;

[0048] Figure 5 This is a structural block diagram of a hair removal device in one embodiment;

[0049] Figure 6 This is a structural block diagram of a feature acquisition module in one embodiment.

[0050] Explanation of reference numerals in the attached figures:

[0051] 501 Feature acquisition module; 502 Analysis module; 503 Control module; 601 Image recognition unit; 602 Ultrasonic detection unit. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0053] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various concepts, but these concepts are not limited by these terms. These terms are only used to distinguish between the first concept and the second concept. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0054] This application proposes a hair removal method, such as Figure 1 As shown, it includes: step 101 and step 102.

[0055] Step 101: Identify and measure the hair follicles in the target area to obtain hair follicle feature information, including hair diameter, hair follicle depth, and hair follicle bulb diameter.

[0056] The principle of optical hair removal is that light energy is selectively absorbed by the melanin in the hair follicle, generating a thermal effect that destroys the follicle. Hair follicles vary significantly in morphology between individuals and in different locations. For example, some hair follicles are large and deeply embedded under the skin, requiring higher light energy and longer treatment times for effective destruction; others are smaller and more superficial, and excessive light energy can burn the epidermis, causing pain. Using the same energy output on different hair follicles will result in poor hair removal effects and may even cause side effects.

[0057] Hair diameter refers to the cross-sectional width of the hair shaft, usually measured in micrometers. The size of the hair diameter affects its light energy absorption efficiency: larger hairs generally have higher melanin content in the hair shaft and follicle, resulting in stronger light energy absorption, but also requiring more energy to conduct heat to the entire hair follicle bulb. Conversely, smaller hairs have less melanin, and excessive energy can easily cause hair shaft carbonization and epidermal damage.

[0058] Follicular depth refers to the vertical distance from the skin surface to the lowest point of the hair follicle bulb, usually measured in millimeters. Follicular depth determines the thickness of skin that light energy needs to penetrate: deeper hair follicles require longer wavelengths and longer pulse widths to ensure sufficient heat reaches the hair follicle bulb without overheating the epidermis; superficial hair follicles require the opposite.

[0059] The hair follicle bulb is the enlarged lower part of the hair follicle, containing the hair matrix and melanocytes, and is the main target of light energy. The larger the diameter of the hair follicle bulb, the more light energy it needs to absorb to cause irreversible thermal damage and achieve hair removal; if the diameter of the hair follicle bulb is small, only a lower energy is needed to destroy it.

[0060] Step 102: Based on the hair follicle characteristic information and preset logic, set the energy density and pulse width of the output light source, and control the light source to output according to the energy density and pulse width. The energy density is used to provide sufficient heat to bring the hair follicle bulb to the temperature of irreversible damage. Larger hair follicle bulbs have a larger heat capacity and require a higher energy density; smaller hair follicle bulbs have a smaller heat capacity, and excessive energy can easily lead to overheating of the surrounding tissue. The pulse width is matched to the thermal relaxation time of the hair follicle bulb. Deep, larger hair follicle bulbs have a longer thermal relaxation time and require a longer pulse width to allow sufficient heat accumulation; superficial, smaller hair follicle bulbs have a shorter thermal relaxation time and require a shorter pulse width to prevent heat from diffusing to the epidermis.

[0061] In some embodiments, the preset logic can be understood as follows: the larger, deeper, and larger the hair follicle, the higher the required light energy density and the longer the pulse width; conversely, the smaller, shallower, and smaller the hair follicle, the lower the required light energy density and the shorter the pulse width.

[0062] like Figure 2 As shown, step 102 includes:

[0063] Step 201: Determine the hair follicle type based on the hair follicle feature information.

[0064] This step determines the hair follicle type based on the obtained hair follicle characteristic information, including hair diameter, hair follicle depth, and hair follicle bulb diameter.

[0065] Step 2022: If the hair follicle type is terminal hair follicle, set the energy density and pulse width to be the first energy density and the first pulse width, respectively.

[0066] Step 2023: When the hair follicle type is vellus hair follicle, the energy density and pulse width are set as the second energy density and the second pulse width, respectively.

[0067] Step 2024: If none of the hair follicle types belong to the terminal hair follicle or the vellus hair follicle, set the energy density and pulse width to the third energy density and the third pulse width, respectively.

[0068] Wherein, the first energy density is greater than the third energy density, the third energy density is greater than the second energy density, the first pulse width is greater than the third pulse width, and the third pulse width is greater than the second pulse width.

[0069] When the hair follicle type is determined to be a terminal hair follicle, the system sets the energy density to the first energy density, where the value range of the first energy density is 55 to 65 J / cm², for example, 55 J / cm², 60 J / cm², 65 J / cm², and the pulse width is the first pulse width, where the value range of the first pulse width is 11 to 13 ms, for example, 11 ms, 12 ms, 13 ms.

[0070] When the hair follicle type is determined to be vellus hair follicle, the system sets the energy density to the second energy density, where the value range of the second energy density is 20 to 40 J / cm², for example, 20 J / cm², 30 J / cm², 40 J / cm², and the pulse width is the second pulse width, where the value range of the second pulse width is 7 to 9 ms, for example, 7 ms, 8 ms, 9 ms.

[0071] When the hair follicle type is determined to be a standard hair follicle, that is, neither a terminal hair follicle nor a vellus hair follicle, the system sets the energy density to the third energy density, where the value range of the third energy density is 40 to 50 J / cm², for example 40 J / cm², 45 J / cm², 50 J / cm², and the pulse width is the third pulse width, where the value of the third pulse width can be 10 ms.

[0072] By setting the parameters corresponding to different hair follicle types as described above, it is possible to ensure that coarse hair follicles receive sufficient light energy for effective destruction, avoid pain or epidermal damage caused by energy overload in fine hair follicles, and use intermediate parameters for standard hair follicles. After setting, the control module drives the light source to output light energy according to the set energy density and pulse width.

[0073] This embodiment obtains hair diameter, hair follicle depth, and hair follicle bulb diameter as hair follicle characteristic parameters and determines different hair follicle types. The system can output light energy according to the actual situation for different hair follicle types, avoiding the use of uniform light energy parameters for different types of hair follicles, which can lead to poor hair removal effect due to insufficient light energy or skin overheating or pain due to excessive light energy, thus improving the user's hair removal experience.

[0074] In another embodiment, such as Figure 3 As shown, the step of identifying and measuring hair follicles in the target area to obtain hair follicle feature information includes: step 301 and step 302.

[0075] Step 301: Obtain the hair diameter of the target area through image recognition.

[0076] As an optional implementation, the system first converts the acquired image into a grayscale image, performs noise reduction and contrast enhancement on the grayscale image, and then uses an edge detection algorithm to extract the edge contour of the hair shaft. For hair shafts that are clearly visible in the image, the system takes a cross-section perpendicular to its long axis, measures the pixel distance between the two edges, and converts this distance into the actual hair diameter in micrometers using a pre-calibrated pixel-to-actual-size conversion factor.

[0077] Step 302: Obtain the hair follicle depth and hair follicle bulb diameter by ultrasonic detection.

[0078] As an optional embodiment, the system emits ultrasound waves into the skin and receives the echoes, and obtains the hair follicle depth and hair follicle bulb diameter after signal processing.

[0079] The obtained hair diameter, hair follicle depth, and hair bulb diameter together constitute complete hair follicle feature information, providing a data basis for subsequent hair follicle type determination and energy regulation.

[0080] This embodiment increases hair diameter through image recognition and hair follicle depth through ultrasonic detection, providing a technical basis for obtaining hair follicle characteristic parameters. The three complement and verify each other, avoiding misjudgments that may be caused by a single parameter, making the output adjustment have a more reliable data basis and improving the user experience.

[0081] In another embodiment, such as Figure 4 As shown, obtaining the hair follicle depth and hair follicle bulb diameter through ultrasonic detection includes steps 401 and 402.

[0082] Step 401: Emit ultrasound waves to the target area and receive echo signals from different skin layers.

[0083] The received echo is amplified, bandpass filtered, and converted from analog to digital before being sent to a digital signal processor.

[0084] Step 402: Measure the hair follicle depth and hair follicle bulb diameter by analyzing the time difference and characteristics of the echo signal.

[0085] Ultrasound waves propagate through skin tissue, generating reflected echoes when they encounter interfaces with different acoustic impedances. These echo signals are received by the same transducer. The received echoes are amplified, bandpass filtered, and converted from analog to digital before being sent to a digital signal processor. Since the average propagation speed of ultrasound in soft tissue is approximately 1540 m / s, and the echo time at different skin layers depends on tissue depth and sound velocity, the processor calculates the depth of each reflecting interface based on the time difference between transmission and reception. When the echo peak corresponding to the hair follicle is detected, the time difference Δt is recorded, and the hair follicle depth is then determined. ,in Take 1540 m / s.

[0086] Simultaneously, the system analyzes the waveform characteristics of the hair follicle bulb echo and generates an ultrasound image of the target area based on these characteristics. Typical features of skin ultrasound images include: the epidermis exhibits a hyperechoic, continuous, dense linear structure; the dermis shows moderate echogenicity and uniform distribution; and the subcutaneous tissue appears hypoechoic with visible hyperechoic connective tissue septa. Under high-frequency or ultra-high-frequency ultrasound, hair follicle bulbs typically appear as regular, well-defined hypoechoic or isoechoic structures in the ultrasound image. The system extracts the hair follicle bulb boundary from the ultrasound image using image segmentation or edge detection algorithms and calculates the hair follicle bulb diameter.

[0087] This embodiment achieves the measurement of hair follicle depth and hair follicle bulb diameter by analyzing the time difference and waveform characteristics of ultrasonic echoes. It does not require complicated equipment and can be completed using only ultrasonic equipment and basic signal processing. It improves the hair removal effect and safety while taking into account the practicality and universality of the device.

[0088] In another embodiment, determining the hair follicle type based on the hair follicle feature information includes:

[0089] If the hair diameter is greater than a hair diameter threshold, the hair follicle depth is between a first hair follicle depth threshold and a second hair follicle depth threshold, and the hair follicle bulb diameter is between a first hair follicle bulb diameter threshold and a second hair follicle bulb diameter threshold, then the hair follicle is determined to be a terminal hair follicle. In this case, the first hair follicle depth threshold is greater than the second hair follicle depth threshold, and the first hair follicle bulb diameter threshold is greater than the second hair follicle bulb diameter threshold.

[0090] If the hair diameter is less than a hair diameter threshold, the hair follicle depth is between a second hair follicle depth threshold and a third hair follicle depth threshold, and the hair follicle bulb diameter is between a second hair follicle bulb diameter threshold and a third hair follicle bulb diameter threshold, then the hair follicle is determined to be a vellus hair follicle. In this case, the second hair follicle depth threshold is greater than the third hair follicle depth, and the second hair follicle bulb diameter threshold is greater than the third hair follicle bulb diameter threshold.

[0091] This section describes the criteria for determining terminal hair follicles and vellus hair follicles in the aforementioned embodiments. In some embodiments, the hair diameter threshold is 55 μm; the first follicle depth threshold is 7 mm, the second follicle depth threshold is 5 mm, and the third follicle depth threshold is 3 mm; the first follicle bulb diameter threshold is 0.3 mm, the second follicle bulb diameter threshold is 0.2 mm, and the third follicle bulb diameter threshold is 0.1 mm. The determination logic is as follows: First, check whether the hair diameter, follicle depth, and follicle bulb diameter meet the determination criteria for terminal hair follicles. If the hair diameter is greater than or equal to 55 μm, the hair follicle depth is between 5 mm and 7 mm, and the follicle bulb diameter is between 0.2 mm and 0.3 mm, then the hair follicle type is determined to be a terminal hair follicle. If the hair diameter is less than 55 μm, the hair follicle depth is between 3 mm and 5 mm, and the follicle bulb diameter is between 0.1 mm and 0.2 mm, then the hair follicle type is determined to be a vellus hair follicle. If neither of the above conditions is met, then the hair follicle type is determined to be another type of hair follicle. After determining the hair follicle type, the instrument can set the energy density and pulse width of the output light source according to the aforementioned embodiment.

[0092] This embodiment provides criteria for determining terminal hair follicles and vellus hair follicles, enabling the device to determine the type of hair follicle based on the obtained hair diameter, follicle depth, and follicle bulb diameter parameters. This avoids the uncertainty of subjective judgment, ensures the consistency and repeatability of judgment results between different devices and different operators, and provides a data foundation for subsequent different outputs.

[0093] In another embodiment, it further includes:

[0094] The hair growth cycle is detected, which includes the anagen (growth) phase, telogen (resting) phase, or catagen (transitional) phase.

[0095] In optional embodiments, the detection method can be image detection or impedance detection. Image detection involves using images of hair captured by a microscope or similar device, combined with artificial intelligence image algorithms to identify features such as pigment distribution and changes in hair length over a period of time to determine the anagen (growth) phase, telogen (resting) phase, or catagen (transitional) phase of the hair follicle. Impedance detection involves measuring the impedance data of the skin and hair to obtain growth cycle characteristics. For example, the metabolic state of hair follicles during the anagen and telogen phases leads to differences in impedance; the hair growth cycle can be determined using impedance detection.

[0096] When the growth cycle is in the anagen phase and the hair follicle type is terminal hair follicle, based on the first energy density and the first pulse width, the energy density and pulse width are increased and multiple pulse sequences are output.

[0097] When the hair follicle type has been determined to be terminal hair follicle, the device outputs light energy with a first energy density and a first pulse width. Based on this, if the growth cycle is detected to be in the anagen phase, the required energy will be greater because the hair follicle bulb in the anagen phase has a larger volume and more melanin deposited. In optional embodiments, the increase can be 30%-70%, for example, 30%, 50%, or 70%. In addition, using multiple pulse sequence outputs allows energy to accumulate gradually and avoids the epidermis from being overheated due to a single excessively long pulse width.

[0098] If the growth cycle is in a resting or regressing phase, reduce the energy density and pulse width or stop the output.

[0099] During the resting or regression phase, the hair follicle bulb stops dividing, melanin production decreases, and the lower part of the hair follicle begins to degenerate and atrophy. Since hair removal devices primarily rely on melanin as the target of light energy, in the absence of sufficient melanin in the hair follicle to receive light, most of the light energy is absorbed by the skin's melanin, leading to side effects such as redness and blisters. In this situation, regardless of the hair follicle type, the device reduces the energy density and pulse width or stops outputting light altogether.

[0100] Optionally, if the hair follicle is determined to be in the growth phase and is a vellus hair follicle or other hair follicle type, the energy density and pulse width are not adjusted additionally.

[0101] This embodiment expands the data basis for the device's decision on output light energy by introducing growth cycle detection. It can more effectively remove terminal hair follicles in the growth phase and avoid irradiating hair follicles in the resting or regression phase with excessively high light energy. This can avoid side effects, save energy, and improve the user experience.

[0102] Optionally, a prompting step may be included before the light source outputs according to the energy density and pulse width, for example, by issuing a confirmation prompt to the user through a buzzer or indicator light. After the user confirms, the light source begins to output according to the energy density and pulse width.

[0103] Based on the same inventive concept, this application also proposes a hair removal device, such as... Figure 5 As shown, it includes: a feature acquisition module 501, an analysis module 502, and a control module 503.

[0104] The feature acquisition module 501 is used to identify and measure hair follicles in the target area and acquire hair follicle feature information, including hair diameter, hair follicle depth and hair follicle bulb diameter.

[0105] The analysis module 502 is connected to the feature acquisition module and is used to determine the hair follicle type based on the hair follicle feature information.

[0106] The control module 503, connected to the analysis module, is used to set the energy density and pulse width of the output light source according to the hair follicle type and preset logic, and control the light source to output according to the energy density and pulse width.

[0107] The step of setting the energy density and pulse width of the output light source according to the hair follicle type and preset logic includes:

[0108] When the hair follicle type is terminal hair follicle, the energy density and pulse width are set as the first energy density and the first pulse width, respectively.

[0109] When the hair follicle type is vellus hair follicle, the energy density and pulse width are set as the second energy density and the second pulse width, respectively.

[0110] When none of the hair follicle types belong to the terminal hair follicle or the vellus hair follicle, the energy density and pulse width are set to the third energy density and the third pulse width, respectively.

[0111] Wherein, the first energy density is greater than the third energy density, the third energy density is greater than the second energy density, the first pulse width is greater than the third pulse width, and the third pulse width is greater than the second pulse width.

[0112] In this embodiment, each module is used to execute Figure 1 For details of each step in the corresponding embodiment, please refer to the documentation. Figure 1 as well as Figure 1 The relevant descriptions in the corresponding embodiments will not be repeated here.

[0113] The hair removal device of this embodiment obtains hair diameter, hair follicle depth and hair follicle bulb diameter as hair follicle characteristic parameters, and can output light energy according to the actual situation for different hair follicles. This avoids the problem of using the same light energy parameters for different types of hair follicles, which can lead to poor hair removal effect due to insufficient light energy or skin overheating or pain due to excessive light energy, thus improving the user's hair removal experience.

[0114] In another embodiment, the light source is a laser light source and / or a high-intensity pulsed light source.

[0115] For laser hair removal, a semiconductor laser can be selected as the light source. Because the laser source outputs light of approximately a single wavelength and has a highly collimated beam, the light energy can be concentrated on the melanin in the hair follicle, resulting in high hair removal efficiency for terminal hair follicles in the growth phase. Depending on the specific situation, the laser source can be a semiconductor laser with a wavelength range of 800nm-810nm, an alexandrite laser with a wavelength of 755nm, or an Nd:YAG laser with a wavelength of 1064nm. For intense pulsed light (IPL) hair removal, a xenon lamp source can be used with a filter to generate broadband light. The energy density and pulse width of both the aforementioned lasers and IPL sources are adjusted by the control module 503 to achieve adaptive output for different hair follicle types and / or growth cycles.

[0116] By setting the light source to a laser light source or an intense pulsed light light source, this embodiment allows the hair removal device of this application to use two types of light sources in mainstream hair removal methods. Users or manufacturers can choose the appropriate type of light source according to their actual needs, which increases the flexibility and applicability of the hair removal device.

[0117] In another embodiment, such as Figure 6 As shown, the feature acquisition module 501 includes:

[0118] Image recognition unit 601 is used to obtain the hair diameter of the target area through image recognition.

[0119] In some optional embodiments, the image recognition unit includes a miniature camera and a ring-shaped white LED supplementary light source. When the treatment head is in contact with the skin and the contact sensor is triggered, the camera automatically captures a high-definition image of the target area. The operation procedure can be found in [reference needed]. Figure 2 and Figure 2 The relevant descriptions in the corresponding embodiments are not repeated here.

[0120] In some other alternative embodiments, the image recognition unit may be a multispectral imaging system that estimates surface parameters such as hair diameter by analyzing hair images under different wavelengths of light.

[0121] The ultrasonic detection unit 602 is used to obtain the hair follicle depth and hair follicle bulb diameter through ultrasonic detection.

[0122] In some optional embodiments, the ultrasound detection unit 602 uses a miniature high-frequency ultrasound probe with an operating frequency range of 10MHz to 50MHz to meet the resolution requirements for layers from the skin surface to the subcutaneous tissue. Its operation procedure can be found in [reference needed]. Figure 3 and Figure 3 The relevant descriptions in the corresponding embodiments are not repeated here.

[0123] This embodiment divides the feature acquisition module into an image recognition unit and an ultrasonic detection unit, providing a technical basis for acquiring hair follicle feature parameters. The three complement and verify each other, avoiding misjudgments that may be caused by a single parameter, making the output adjustment have a more reliable data basis and improving the user experience.

[0124] In another embodiment, the device further includes:

[0125] The growth cycle detection module is used to detect the growth cycle of hair, which includes the anagen (growth) phase, telogen (resting) phase, or catagen (regression) phase.

[0126] In some embodiments, the growth cycle detection module includes a microscopic observation module or an impedance measurement module. In this embodiment, the growth cycle module is used to perform the detection steps for the hair growth cycle in the foregoing embodiments, which will not be described again here.

[0127] Optionally, the device further includes a prompting module for issuing a confirmation prompt to the user before the light source outputs according to the energy density and pulse width. After the user confirms, the control module 503 controls the light source to output according to the energy density and pulse width.

[0128] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0130] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A hair removal method, characterized in that, include: The hair follicles in the target area are identified and measured to obtain hair follicle feature information, which includes hair diameter, hair follicle depth and hair follicle bulb diameter. The acquisition of hair follicle feature information includes: obtaining the hair diameter in the target region through image recognition; The depth of the hair follicle and the diameter of the hair follicle bulb are obtained by ultrasonic detection; The step of obtaining the hair follicle depth and hair follicle bulb diameter through ultrasonic detection includes: Ultrasonic waves are emitted to the target area, and echo signals from different skin layers are received; The hair follicle depth and hair follicle bulb diameter are measured by analyzing the time difference and waveform characteristics of the echo signal. Based on the hair follicle feature information and preset logic, the energy density and pulse width of the output light source are set, and the light source is controlled to output according to the energy density and pulse width; The step of setting the energy density and pulse width of the output light source based on the hair follicle feature information and preset logic includes: The hair follicle type is determined based on the described hair follicle characteristic information; When the hair follicle type is terminal hair follicle, the energy density and pulse width are set as a first energy density and a first pulse width, respectively. When the hair follicle type is vellus hair follicle, the energy density and pulse width are set as the second energy density and the second pulse width, respectively. When none of the hair follicle types belong to the terminal hair follicle or the vellus hair follicle, the energy density and pulse width are set to the third energy density and the third pulse width, respectively. Wherein, the first energy density is greater than the third energy density, the third energy density is greater than the second energy density, and the first pulse width is greater than the third pulse width, and the third pulse width is greater than the second pulse width; The step of determining the hair follicle type based on the hair follicle feature information includes: when the hair diameter is greater than a hair diameter threshold, the hair follicle depth is between a first hair follicle depth threshold and a second hair follicle depth threshold, and the hair follicle bulb diameter is between a first hair follicle bulb diameter threshold and a second hair follicle bulb diameter threshold, it is determined to be a terminal hair follicle, wherein the first hair follicle depth threshold is greater than the second hair follicle depth threshold, and the first hair follicle bulb diameter threshold is greater than the second hair follicle bulb diameter threshold. If the hair diameter is less than the hair diameter threshold, the hair follicle depth is between the second hair follicle depth threshold and the third hair follicle depth threshold, and the hair follicle bulb diameter is between the second hair follicle bulb diameter threshold and the third hair follicle bulb diameter threshold, then the hair follicle is determined to be a vellus hair follicle. In this case, the second hair follicle depth threshold is greater than the third hair follicle depth, and the second hair follicle bulb diameter threshold is greater than the third hair follicle bulb diameter threshold. Wherein, the first energy density ranges from 55 to 65 J / cm², the first pulse width ranges from 11 to 13 ms, the second energy density ranges from 20 to 40 J / cm², the second pulse width ranges from 7 to 9 ms, the third energy density ranges from 40 to 50 J / cm², the third pulse width is 10 ms, and the hair diameter threshold is 55 μm; the first hair follicle depth threshold is 7 mm, the second hair follicle depth threshold is 5 mm, and the third hair follicle depth threshold is 3 mm; the first hair follicle bulb diameter threshold is 0.3 mm, the second hair follicle bulb diameter threshold is 0.2 mm, and the third hair follicle bulb diameter threshold is 0.1 mm.

2. The method according to claim 1, characterized in that, Also includes: Detecting the hair growth cycle, which includes the anagen (growth) phase, telogen (resting) phase, or catagen (transitional) phase; When the growth cycle is in the growth phase and the hair follicle type is terminal hair follicle, based on the first energy density and the first pulse width, the energy density and pulse width are increased and multiple pulse sequences are output. If the growth cycle is in a resting or regressing phase, reduce the energy density and pulse width or stop the output.

3. A hair removal device, characterized in that, For performing the hair removal method as described in claim 1, the hair removal device comprises: The feature acquisition module is used to identify and measure hair follicles in the target area and acquire hair follicle feature information, including hair diameter, hair follicle depth and hair follicle bulb diameter. An analysis module, connected to the feature acquisition module, is used to determine the hair follicle type based on the hair follicle feature information; The control module is connected to the analysis module and is used to set the energy density and pulse width of the output light source according to the hair follicle type and preset logic, and control the light source to output according to the energy density and pulse width. The step of setting the energy density and pulse width of the output light source according to the hair follicle type and preset logic includes: When the hair follicle type is terminal hair follicle, the energy density and pulse width are set as a first energy density and a first pulse width, respectively. When the hair follicle type is vellus hair follicle, the energy density and pulse width are set as the second energy density and the second pulse width, respectively. When none of the hair follicle types belong to the terminal hair follicle or the vellus hair follicle, the energy density and pulse width are set to the third energy density and the third pulse width, respectively. Wherein, the first energy density is greater than the third energy density, the third energy density is greater than the second energy density, the first pulse width is greater than the third pulse width, and the third pulse width is greater than the second pulse width.

4. The apparatus according to claim 3, characterized in that, The light source is a laser light source and / or a high-intensity pulsed light source.

5. The apparatus according to claim 3, characterized in that, The feature acquisition module includes: An image recognition unit is used to obtain the hair diameter in the target area through image recognition; An ultrasonic detection unit is used to obtain the hair follicle depth and hair follicle bulb diameter through ultrasonic detection.

6. The apparatus according to claim 3, characterized in that, Also includes: The growth cycle detection module is used to detect the growth cycle of hair, which includes the anagen (growth) phase, telogen (resting) phase, or catagen (transitional) phase.

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