Contact detection device, beauty instrument and contact detection method

Abstract

The embodiment of the invention discloses a contact detection device, a beauty instrument and a contact detection method, and is applied to the field of contact detection. In the embodiment of the invention, the contact detection device comprises a thin film sensor and a sensor control module, the thin film sensor is attached to the treatment surface of the energy generation device, and the thin film sensor comprises a capacitance sensor and a piezoresistive sensor; the capacitance change is detected through the capacitance sensor to determine whether the treatment surface is in contact with the skin, and meanwhile, the pressure change is detected through the piezoresistive sensor to determine whether the treatment surface slides relative to the skin, so that whether the treatment surface is in complete contact with the skin or not can be accurately determined, namely, the contact state between the treatment surface and the skin can be accurately detected; and when the treatment surface is in contact with the skin and slides relative to the skin, the energy generator is controlled to emit energy to the skin for treatment, so that the energy is effectively prevented from being triggered by the beauty instrument by mistake.

Description

Technical Field

[0001] This application relates to the field of contact detection, and more particularly to a contact detection device, a beauty instrument, and a contact detection method. Background Technology

[0002] With the development of technology, beauty devices are increasingly used in people's daily lives. Contact detection is a crucial technology in beauty devices, primarily used to monitor the contact state between the device and the skin to ensure the safety and effectiveness of the device during use. Sensor technology plays a key role in contact detection.

[0003] Current beauty devices typically employ a single type of sensor for contact detection, triggering energy for treatment based on the contact state. For example, some devices use capacitive sensors. When skin approaches the capacitive sensor, it alters the sensor's electric field distribution, causing a change in capacitance. This change in capacitance is used to determine if the device is in contact with the skin. However, if external signal interference or device malfunction occurs during use, such as interference with the capacitive sensor's electric field or a device failure, the single-type sensor may struggle to accurately detect the contact state between the device and the skin. This can lead to false energy triggering and potential skin damage. Summary of the Invention

[0004] This application provides a contact detection device, a beauty instrument, and a contact detection method, which can accurately detect the contact state between the treatment surface and the skin, and effectively avoid accidental energy triggering.

[0005] This application provides a contact detection device including: a thin-film sensor and a sensor control module; the thin-film sensor is attached to the treatment surface of an energy generating device, and the thin-film sensor includes a capacitive sensor and a piezoresistive sensor;

[0006] During the process of the treatment surface being brought close to the skin, the capacitive sensor is used to detect the capacitance change on the treatment surface and transmit the corresponding capacitance signal to the sensor control module; the piezoresistive sensor is used to detect the pressure change on the treatment surface and transmit the corresponding resistance signal to the sensor control module.

[0007] The sensor control module is used to determine whether the treatment surface is in contact with the skin based on the capacitance signal, and to determine whether the treatment surface is sliding relative to the skin based on the resistance signal; if the treatment surface is in contact with the skin and the treatment surface is sliding relative to the skin, then the energy generating device is controlled to emit energy to the skin for treatment.

[0008] Furthermore, the sensor control module includes: a capacitance detection circuit and a processor;

[0009] The capacitance detection circuit is connected to the capacitance sensor and the processor, and is used to convert the capacitance signal transmitted by the capacitance sensor into a corresponding first voltage signal, and transmit the first voltage signal to the processor;

[0010] The processor is configured to determine that the treatment surface is in contact with the skin if the first voltage signal is greater than or equal to a first voltage threshold, and to determine that the treatment surface is not in contact with the skin if the first voltage signal is less than the first voltage threshold.

[0011] Furthermore, the sensor control module includes: a resistance detection circuit and a processor;

[0012] The resistance detection circuit is connected to the piezoresistive sensor and the processor, and is used to convert the resistance signal transmitted by the piezoresistive sensor into a corresponding second voltage signal, and transmit the second voltage signal to the processor;

[0013] The processor is configured to determine that the treatment surface is sliding relative to the skin if the voltage change difference of the second voltage signal is greater than or equal to a second voltage threshold, and to determine that the treatment surface is not sliding relative to the skin if the voltage change difference is less than the second voltage threshold.

[0014] Furthermore, the structure of the thin-film sensor includes: a sensor sensing layer and a flexible circuit board;

[0015] The sensor sensing layer is disposed on the side of the flexible circuit board away from the treatment surface;

[0016] The sensor sensing layer includes: a first electrode plate and interdigitated electrodes; the flexible circuit board is connected to the sensor control module;

[0017] A second electrode plate is disposed on the side of the flexible circuit board near the treatment surface; the flexible circuit board is electrically connected to the first electrode plate and the second electrode plate respectively, forming the capacitive sensor;

[0018] The flexible circuit board is electrically connected to the interdigital electrode, and a corresponding conductive elastic film is provided on the side of the interdigital electrode away from the treatment surface, which constitutes the piezoresistive sensor.

[0019] Furthermore, the structure of the thin-film sensor also includes: a water-resistant film and a first adhesive backing; the water-resistant film is bonded to the side of the sensor sensing layer away from the flexible circuit board through the first adhesive backing.

[0020] Furthermore, the structure of the thin-film sensor also includes: a reinforcing layer; one side of the second electrode plate is attached to the treatment surface through the reinforcing layer, and the reinforcing layer is used to support the second electrode plate and the flexible circuit board.

[0021] Furthermore, the structure of the thin-film sensor also includes: a second adhesive; one side of the second electrode plate is bonded to the treatment surface by the second adhesive, the second adhesive being used to ensure close contact between the thin-film sensor and the treatment surface.

[0022] Furthermore, the shape of the thin-film sensor includes: ring, circle, square or rectangle, etc.

[0023] This application embodiment also provides a beauty device, which includes: the above-mentioned contact detection device and treatment head; the thin film sensor of the contact detection device is attached to the surface of the treatment head shell.

[0024] This application also provides a contact detection method, applied to the above-mentioned contact detection device or beauty instrument, the contact detection method comprising:

[0025] The capacitance signal transmitted by the capacitance sensor determines whether the treatment surface of the energy generating device is in contact with the skin;

[0026] Whether the treatment surface slides relative to the skin is determined based on the resistance signal transmitted by the piezoresistive sensor;

[0027] If the treatment surface comes into contact with the skin and slides relative to the skin, the energy generating device is controlled to emit energy to the skin for treatment.

[0028] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0029] As can be seen, in this embodiment, the capacitance sensor detects changes in capacitance to determine whether the treatment surface is in contact with the skin, and the piezoresistive sensor detects changes in pressure to determine whether the treatment surface is sliding relative to the skin. This can accurately determine whether the treatment surface is in complete contact with the skin, that is, it can accurately detect the contact state between the treatment surface and the skin. When the treatment surface is in contact with the skin and the treatment surface is sliding relative to the skin, the energy generating device is then controlled to emit energy to the skin for treatment, effectively avoiding false energy triggering. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a contact detection device disclosed in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of a thin-film sensor and a sensor control module disclosed in an embodiment of this application;

[0033] Figure 3 This is a waveform diagram of a capacitive contact detection disclosed in an embodiment of this application;

[0034] Figure 4 This is a waveform diagram of a resistive contact detection disclosed in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of the structure of a thin-film sensor disclosed in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the shape of a thin-film sensor disclosed in an embodiment of this application. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0038] In the description of the embodiments of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0040] In existing beauty devices, a single type of sensor is typically used for contact detection, triggering energy for treatment based on the contact state. For example, some devices use capacitive sensors. When skin approaches the capacitive sensor, it changes the electric field distribution of the sensor, causing a change in the sensor's capacitance. The device determines whether it is in contact with the skin by detecting this change in capacitance. However, if external signal interference or device malfunction occurs during use, such as interference with the electric field of the capacitive sensor or a device failure, the single-type sensor may fail to accurately detect the contact state between the beauty device and the skin, leading to false energy triggering and potentially causing skin damage. Therefore, this application provides a contact detection device that can accurately detect the contact state between the treatment surface and the skin, effectively avoiding false energy triggering. Figure 1 As shown, the details are as follows:

[0041] In this embodiment, the contact detection device 300 includes a thin-film sensor 100 and a sensor control module 200, which can be a sensor control board. The thin-film sensor 100 is attached to the treatment surface of the energy generating device, which is the side of the energy generating device that contacts the skin and emits energy to the skin. It is understood that the contact detection device can be applied to beauty devices. The energy generating device differs depending on the beauty device; for example, for an ultrasonic therapy device, the energy generating device can be an ultrasonic transducer; for a radiofrequency therapy device, the energy generating device can be a radiofrequency electrode; and for a laser therapy device, the energy generating device can be a light source.

[0042] The beauty device includes a contact detection device and a treatment head. The treatment head contains an energy generating device. The treatment surface of the beauty device is the surface of the treatment head shell, which is the plane on the treatment head shell that comes into contact with the skin. A thin-film sensor is attached to the surface of the treatment head shell, and the size of the thin-film sensor is the same as the size of the treatment head shell.

[0043] The thin-film sensor 100 includes a capacitive sensor and a piezoresistive sensor. During the process of the treatment surface approaching the skin, the capacitive sensor detects changes in capacitance on the treatment surface and transmits the corresponding capacitance signal to the sensor control module. It can be understood that when the treatment surface is in contact with the skin, the capacitance detected by the capacitive sensor decreases, and when the treatment surface is not in contact with the skin, the capacitance detected by the capacitive sensor increases. By detecting changes in capacitance on the treatment surface, the capacitive sensor can determine whether the treatment surface is in contact with the skin. It should be noted that the capacitance signal mentioned in the embodiments of this application refers to a signal whose capacitance value or capacitance change value can be obtained directly or indirectly, including not only capacitance signals that directly reflect capacitance, but also voltage signals or current signals, etc., without specific limitations here.

[0044] A piezoresistive sensor is used to detect pressure changes on the treatment surface and transmits the corresponding resistance signal to the sensor control module. It is understood that when the treatment surface slides on the skin, the piezoresistive sensor detects a larger range of pressure changes, and when the treatment surface is not sliding on the skin, the piezoresistive sensor detects a smaller range of pressure changes. The piezoresistive sensor can generate a corresponding changing resistance signal based on pressure changes. By detecting pressure changes on the treatment surface, the piezoresistive sensor can determine whether the treatment surface is sliding on the skin. It should be noted that the resistance signal mentioned in this embodiment refers to a signal with a resistance value or change in electrical resistance that can be obtained directly or indirectly. This includes not only resistance signals that directly reflect resistance but also voltage signals or current signals, etc., without specific limitations here.

[0045] The sensor control module 200 is used to determine whether the treatment surface is in contact with the skin based on a capacitance signal. Specifically, it can detect whether the capacitance signal exceeds a preset capacitance threshold to determine if the treatment surface is in contact with the skin. That is, if the capacitance signal exceeds the preset capacitance threshold, it is determined that the treatment surface is in contact with the skin; if the capacitance signal does not exceed the preset capacitance threshold, it is determined that the treatment surface is not in contact with the skin. The preset capacitance threshold can be the capacitance value detected by the capacitance sensor when the treatment surface is not in contact with the skin. Simultaneously, the sensor control module 200 can also determine whether the treatment surface is sliding relative to the skin based on a resistance signal. Specifically, it can detect whether the difference in the resistance variation range of the resistance signal reaches a preset resistance threshold to determine if the treatment surface is sliding relative to the skin. That is, if the difference in the resistance variation range reaches the preset resistance threshold, it is determined that the treatment surface is sliding relative to the skin; if the difference in the resistance variation range does not reach the preset resistance threshold, it is determined that the treatment surface is not sliding relative to the skin.

[0046] In the sensor control module 200, if it detects that the treatment surface is in contact with the skin and is sliding relative to the skin, i.e., it is determined that the treatment surface is in complete contact with the skin, it controls the energy generator to emit energy to the skin for treatment. If it detects that the treatment surface is not in contact with the skin, or that the treatment surface is not sliding relative to the skin, i.e., it is determined that the treatment surface is not in complete contact with the skin, it controls the energy generator to stop emitting energy to the skin.

[0047] As can be seen, in this embodiment, the capacitance sensor detects changes in capacitance to determine whether the treatment surface is in contact with the skin, and the piezoresistive sensor detects changes in pressure to determine whether the treatment surface is sliding relative to the skin. This can accurately determine whether the treatment surface is in complete contact with the skin, that is, it can accurately detect the contact state between the treatment surface and the skin. When the treatment surface is in contact with the skin and the treatment surface is sliding relative to the skin, the energy generating device is then controlled to emit energy to the skin for treatment, effectively avoiding the energy generating device from accidentally triggering energy.

[0048] When the treatment surface of the beauty device is gently placed on the skin, a thin-film sensor combining capacitive and piezoresistive sensors can simultaneously detect changes in capacitance and pressure, improving the accuracy and reliability of contact detection and preventing skin damage during use. The thin-film sensor monitors the contact state between the treatment surface and the skin in real time. When it detects complete contact, it controls the energy generator to emit energy; when it detects incomplete contact, it immediately stops the device, controlling the energy generator to cease energy emission to protect the skin from harm.

[0049] In one feasible approach, a single type of sensor for contact detection fails to determine whether the device is sliding, causing it to continuously emit energy to the same area of ​​the skin, potentially causing damage. A resistance sensor, detecting pressure changes, can determine whether the treatment surface is sliding on the skin, effectively preventing the user from continuously treating the same area.

[0050] Furthermore, such as Figure 2 As shown in the embodiment of this application, the sensor control module 200 includes: a capacitance detection circuit 201 and a processor 203; the capacitance detection circuit 201 is connected to the capacitance sensor 101 of the thin-film sensor 100 and the processor 203, and is used to convert the capacitance signal transmitted by the capacitance sensor 101 into a corresponding first voltage signal, and transmit the first voltage signal to the processor 203. The capacitance detection circuit 201 includes: a frequency-modulated oscillator, a frequency discriminator, and an amplifier. It can input the capacitance signal transmitted by the capacitance sensor 101 into the frequency-modulated oscillator. At this time, the resonant frequency of the frequency-modulated oscillator will change. The frequency change of the frequency-modulated oscillator is converted into a voltage signal change by the frequency discriminator, and finally amplified and output by the amplifier.

[0051] The processor 203 is configured to determine that the treatment surface is in contact with the skin if the first voltage signal is greater than or equal to a first voltage threshold, and to determine that the treatment surface is not in contact with the skin if the first voltage signal is less than the first voltage threshold. The first voltage threshold can be the voltage value detected by the capacitance detection circuit when the treatment surface is in contact with the skin. During capacitance detection, the waveform of the corresponding first voltage signal is as follows: Figure 3 As shown, if the first voltage signal is greater than or equal to the first voltage threshold (detection threshold), it is determined that the treatment surface is in contact with the skin, and the beauty device will enter the treatment preparation state; if the first voltage signal is less than the first voltage threshold, it is determined that the treatment surface is not in contact with the skin, and the beauty device will stop working (i.e. stop emitting energy) to protect the skin from damage.

[0052] Furthermore, the sensor control module 200 also includes a resistance detection circuit 202. The resistance detection circuit 202 is connected to the piezoresistive sensor 102 of the thin-film sensor 100 and the processor 203, and is used to convert the resistance signal transmitted by the piezoresistive sensor 102 into a corresponding second voltage signal, and transmit the second voltage signal to the processor 203. The resistance detection circuit 202 can be a bridge circuit, a three-wire measurement circuit, or a four-wire measurement circuit; no specific limitation is made here. The resistance detection circuit 202 includes a current source, an adjustable resistor, and a voltmeter. The resistance signal transmitted by the piezoresistive sensor 102 is set as the resistance value of the adjustable resistor, and the corresponding second voltage signal is obtained by measuring the voltage across the adjustable resistor using the voltmeter.

[0053] The processor 203 is configured to determine that the treatment surface has slid relative to the skin if the voltage change difference of the second voltage signal is greater than or equal to a second voltage threshold, and to determine that the treatment surface has not slid relative to the skin if the voltage change difference is less than the second voltage threshold. The second voltage threshold can be the voltage value detected by the resistance detection circuit 202 when the treatment surface slides relative to the skin. During the sliding detection, the waveform of the corresponding second voltage signal is as follows: Figure 4 As shown, the pressure on the treatment surface is detected by the piezoresistive sensor 102 as a supplement to the capacitive sensor 101. When the treatment surface is in contact with the skin and slides relative to the skin, the energy generating device is controlled to emit energy to the skin for treatment.

[0054] Understandably, if the treatment surface does not slide relative to the skin, the energy generated by the energy-generating device (such as focused ultrasound energy) will continuously emit energy at a single point on the skin. This continuous temperature increase at that point can lead to skin tissue necrosis. Therefore, energy is emitted only when the treatment surface slides relative to the skin, thus avoiding continuous single-point emission and improving the safety of the beauty device. Through capacitance detection and sliding detection, contact detection of the beauty device can be effectively achieved, improving the accuracy and reliability of contact detection and preventing damage to the skin during use.

[0055] The processor can be an MCU (microcontroller) or a CPU (central processing unit), which is not limited here. The processor is connected to the memory of the sensor control module. The memory stores executable program code. When the processor executes the executable program code, it detects whether the treatment surface is in contact with the skin based on a first voltage signal and whether the treatment surface is sliding on the skin based on a second voltage signal.

[0056] Furthermore, such as Figure 6As shown in the embodiments of this application, the shape of the thin-film sensor can be ring-shaped, circular, square, or rectangular, etc., and is not specifically limited here. The shape of the thin-film sensor can be determined based on the outer shell of the treatment head of the beauty device at the point of contact with the skin, so that the thin-film sensor can fit more closely to the skin. For example, for an ultrasonic therapy device, the shape of the thin-film sensor does not have to be ring-shaped; the center of the corresponding thin-film sensor is a PI film, which allows ultrasonic energy to penetrate. For radiofrequency therapy devices and laser therapy devices, the corresponding thin-film sensor is ring-shaped, that is, the corresponding thin-film sensor needs a through-hole, so that the electrode can fit with the skin, or the light source can irradiate the skin through the opening.

[0057] The following will describe in detail the structure of the thin-film sensor in the embodiments of this application, taking a circular shape as an example. Figure 5 As shown.

[0058] Specifically, the structure of the thin-film sensor includes: a sensor sensing layer 503 and a flexible circuit board (FPC) 504; the sensor sensing layer 503 is disposed on the side of the flexible circuit board 504 away from the treatment surface; the sensor sensing layer 503 includes: a first electrode plate and interdigital electrodes; the first electrode plate and interdigital electrodes are alternately distributed on the sensor sensing layer 503, such as... Figure 6 In the sensor sensing layer of the circular thin-film sensor, interdigitated electrodes are disposed in region A, and a first electrode plate is disposed in region B. Regions A and B are alternately distributed on the sensor sensing layer. A flexible circuit board 504 is connected to the sensor control module. The ribbon cable of the flexible circuit board 504 is connected to the sensor control module, allowing capacitance and resistance signals to be transmitted to the sensor control module via the ribbon cable. The use of a flexible circuit board in the thin-film sensor makes it more flexible and allows it to fit snugly against the treatment surface of the beauty device.

[0059] Specifically, a second electrode plate 505 is provided on the side of the flexible circuit board 504 near the treatment surface; that is, an electrode plate is provided on both sides of the flexible circuit board 504, and a capacitor is formed between the electrode plates on both sides; the flexible circuit board 504 is electrically connected to the first electrode plate and the second electrode plate 504 on both sides respectively, forming a capacitance sensor; when the treatment surface comes into contact with the skin, the capacitance between the first electrode plate and the second electrode plate will change, and the flexible circuit board 504 will transmit the corresponding capacitance signal to the sensor control module.

[0060] The interdigital electrode comprises multiple electrodes spaced apart from each other. A flexible circuit board 504 is electrically connected to the interdigital electrode. A conductive elastic film is positioned on the side of the interdigital electrode away from the treatment surface, forming a piezoresistive sensor. The conductive elastic film has rough particles on its surface. When pressed, these particles contact two adjacent electrodes on the interdigital electrode, establishing electrical conductivity between them. This is equivalent to connecting a resistor in parallel within the circuit. The parallel connection reduces the resistance value, and the flexible circuit board 504 transmits the corresponding resistance signal to the sensor control module.

[0061] Furthermore, the structure of the thin-film sensor also includes: a water-resistant film 501 and a first adhesive 502; the water-resistant film 501 is bonded to the side of the sensor sensing layer 503 away from the flexible circuit board 504 via the first adhesive 502. The first adhesive 502 can be 3M adhesive, hot melt adhesive, or other bonding adhesives, mainly used for bonding and adhesion. The water-resistant film 501 can be a PI (polyimide) film, PU (polyurethane) film, PET (polyethylene terephthalate) sheet, or other water-resistant materials, used to isolate it from external liquids and prevent water ingress. In other words, using the water-resistant film 501 as a protective layer on the outer surface of the thin-film sensor prevents contact with liquids when the thin-film sensor is attached to the treatment surface, improving the waterproof performance of the thin-film sensor and preventing water or other liquids from affecting its normal operation, thereby ensuring the contact detection function of the thin-film sensor.

[0062] Furthermore, the structure of the thin-film sensor also includes a reinforcing layer 506; one side of the flexible circuit board is attached to the treatment surface through the reinforcing layer 506, which supports the second electrode plate and the flexible circuit board. The reinforcing layer can be made of materials such as PET, PI, or stainless steel, and is not specifically limited here.

[0063] Furthermore, the structure of the thin-film sensor also includes a second adhesive 507; one side of the second electrode plate 505 is bonded to the treatment surface via the second adhesive 507, which ensures close contact between the thin-film sensor and the treatment surface. The second adhesive 507 can also be 3M adhesive, hot melt adhesive, or other bonding adhesives; specific applications are not limited here. The second adhesive allows the thin-film sensor to be tightly adhered to the treatment surface of the beauty device, ensuring close contact between the thin-film sensor and the treatment surface without air bubbles, further improving the accuracy of contact detection.

[0064] As can be seen, the thin-film sensor in this embodiment has the characteristics of flexibility, thinness, high sensitivity and simple assembly, and can be attached to the treatment surface of the beauty device without affecting the appearance size and weight of the beauty device.

[0065] This application embodiment also provides a contact detection method, characterized in that it is applied to the above-mentioned contact detection device or the above-mentioned beauty instrument, the contact detection method comprising:

[0066] The capacitive signal transmitted by the capacitive sensor determines whether the treatment surface of the energy generating device is in contact with the skin;

[0067] Whether the treatment surface slides relative to the skin is determined based on the resistance signal transmitted by the piezoresistive sensor;

[0068] If the treatment surface comes into contact with the skin and slides relative to the skin, the energy generating device is controlled to emit energy to the skin for treatment.

[0069] In this invention, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0070] The above embodiments are only used to illustrate the technical solutions of the embodiments of this application, and are not intended to limit them. Although the embodiments of this application have been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of the embodiments of this application.

Claims

1. A contact detection device, characterized in that, include: Thin-film sensor and sensor control module; The thin-film sensor is attached to the treatment surface of the energy generating device, and the thin-film sensor includes a capacitive sensor and a piezoresistive sensor. During the process of the treatment surface being brought close to the skin, the capacitive sensor is used to detect the capacitance change on the treatment surface and transmit the corresponding capacitance signal to the sensor control module; the piezoresistive sensor is used to detect the pressure change on the treatment surface and transmit the corresponding resistance signal to the sensor control module. The sensor control module is used to determine whether the treatment surface is in contact with the skin based on the capacitance signal, and to determine whether the treatment surface is sliding relative to the skin based on the resistance signal. If the treatment surface comes into contact with the skin and slides relative to the skin, the energy generating device is controlled to emit energy to the skin for treatment.

2. The contact detection device according to claim 1, characterized in that, The sensor control module includes: a capacitance detection circuit and a processor; The capacitance detection circuit is connected to the capacitance sensor and the processor, and is used to convert the capacitance signal transmitted by the capacitance sensor into a corresponding first voltage signal, and transmit the first voltage signal to the processor; The processor is configured to determine that the treatment surface is in contact with the skin if the first voltage signal is greater than or equal to a first voltage threshold, and to determine that the treatment surface is not in contact with the skin if the first voltage signal is less than the first voltage threshold.

3. The contact detection device according to claim 1, characterized in that, The sensor control module includes: a resistance detection circuit and a processor; The resistance detection circuit is connected to the piezoresistive sensor and the processor, and is used to convert the resistance signal transmitted by the piezoresistive sensor into a corresponding second voltage signal, and transmit the second voltage signal to the processor; The processor is configured to determine that the treatment surface is sliding relative to the skin if the voltage change difference of the second voltage signal is greater than or equal to a second voltage threshold, and to determine that the treatment surface is not sliding relative to the skin if the voltage change difference is less than the second voltage threshold.

4. The contact detection device according to claim 1, characterized in that, The structure of the thin-film sensor includes: a sensor sensing layer and a flexible circuit board; The sensor sensing layer is disposed on the side of the flexible circuit board away from the treatment surface; The sensor sensing layer includes: a first electrode plate and interdigitated electrodes; the flexible circuit board is connected to the sensor control module; A second electrode plate is disposed on the side of the flexible circuit board near the treatment surface; the flexible circuit board is electrically connected to the first electrode plate and the second electrode plate respectively, forming the capacitive sensor; The flexible circuit board is electrically connected to the interdigital electrode, and a corresponding conductive elastic film is provided on the side of the interdigital electrode away from the treatment surface, which constitutes the piezoresistive sensor.

5. The contact detection device according to claim 4, characterized in that, The structure of the thin-film sensor further includes: a water-resistant film and a first adhesive backing; the water-resistant film is bonded to the side of the sensor sensing layer away from the flexible circuit board through the first adhesive backing.

6. The contact detection device according to claim 4, characterized in that, The structure of the thin-film sensor further includes: a reinforcing layer; one side of the second electrode plate is attached to the treatment surface through the reinforcing layer, and the reinforcing layer is used to support the second electrode plate and the flexible circuit board.

7. The contact detection device according to claim 4, characterized in that, The structure of the thin-film sensor further includes: a second adhesive backing; one side of the second electrode plate is bonded to the treatment surface by the second adhesive backing, the second adhesive backing being used to ensure close contact between the thin-film sensor and the treatment surface.

8. The contact detection device according to claim 1, characterized in that, The shape of the thin-film sensor includes: ring, circle, square or rectangle, etc.

9. A beauty device, characterized in that, The beauty device includes: a contact detection device as described in any one of claims 1 to 8 and a treatment head; the thin-film sensor of the contact detection device is attached to the surface of the treatment head housing.

10. A contact detection method, characterized in that, The contact detection method, applied to the contact detection device according to any one of claims 1 to 8, or the beauty device according to claim 9, comprises: The capacitive signal transmitted by the capacitive sensor determines whether the treatment surface of the energy generating device is in contact with the skin; Whether the treatment surface slides relative to the skin is determined based on the resistance signal transmitted by the piezoresistive sensor; If the treatment surface comes into contact with the skin and slides relative to the skin, the energy generating device is controlled to emit energy to the skin for treatment.

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