Skin treatment device

Abstract

The utility model discloses a skin treatment device which comprises a shell, an output assembly, a transmission assembly, a first motor, a sensing assembly, a controller, a prompting assembly and at least one sensing part, and the shell is provided with an output window; the output assembly is arranged in the shell and used for outputting energy towards the output window. The transmission assembly is connected with the output assembly; the first motor is connected with the output assembly through the transmission assembly and drives the transmission assembly to move so as to drive the output assembly to move. The sensing part is arranged on the transmission assembly or the output assembly; the sensing assembly is arranged corresponding to the detection position, the motion trail of the sensing part passes through the detection position, and the sensing part triggers the sensing assembly when located at the detection position; the controller is electrically connected with the sensing assembly and judges whether the rotating speed of the first motor is abnormal or not according to the triggering condition of the sensing assembly; the prompting assembly is electrically connected with the controller, and when the controller judges that the rotating speed of the first motor is abnormal, the controller controls the prompting assembly to conduct abnormal prompting. According to the technical scheme, the use safety of the skin treatment device is improved.

Description

Technical Field

[0001] This application relates to the field of beauty equipment technology, and in particular to a skin treatment device. Background Technology

[0002] Currently, ultrasonic beauty devices, as non-invasive skin treatment devices, rely on the core technology of ultrasonic transducers to generate ultrasound waves that act on deep skin tissues, achieving tightening and lifting effects through thermal effects. To improve treatment efficiency, existing skin treatment devices (taking ultrasonic beauty devices as an example) generally use a motor combined with a transmission component to drive the ultrasonic transducer to move along a preset trajectory at a set speed (such as rotating or translating around an axis), thereby expanding the coverage area of ​​the ultrasound focus and shortening the treatment time per session. However, in actual use, existing ultrasonic beauty devices may experience abnormal motor speeds, such as the motor speed being lower than the set speed or the motor stalling (i.e., the speed is 0). When the motor speed is lower than the set speed, the ultrasonic transducer's action time on the same spot on the skin will be longer. When the motor stalls, the ultrasonic transducer stops moving to continue acting on the same spot on the skin. Both of these abnormal situations may lead to burns or scalds to the skin or deep tissues. Therefore, existing ultrasonic beauty devices pose a safety hazard. Utility Model Content

[0003] This application provides a skin treatment device aimed at solving the problem that abnormal motor speed in a skin treatment device can lead to burns or scalds on the skin or deep tissues, thereby improving the safety of using the skin treatment device.

[0004] To achieve the above objectives, the skin treatment device proposed in this application includes:

[0005] The casing is equipped with an output window;

[0006] An output component, disposed within the housing, is used to output energy toward the output window to act on the skin area corresponding to the output window;

[0007] A transmission assembly is disposed within the housing, and the transmission assembly is connected to the output assembly;

[0008] A first motor is disposed inside the housing. The first motor is connected to the output component through the transmission component and is used to drive the transmission component to move so as to drive the output component to move.

[0009] At least one sensing element is provided in the transmission assembly or the output assembly;

[0010] A sensing component is provided, which is set to a detection position. The sensing component is triggered when the motion trajectory of the sensing part passes through the detection position and the sensing part is located at the detection position.

[0011] A controller is electrically connected to the sensing component, and the controller determines whether the speed of the first motor is abnormal based on the triggering status of the sensing component.

[0012] The prompting component is electrically connected to the controller. When the controller determines that the speed of the first motor is abnormal, it controls the prompting component to issue an abnormal prompt.

[0013] In some embodiments, the output component includes an ultrasonic transducer with its output surface facing the output window for outputting ultrasonic waves through the output window to penetrate the skin to be treated; the housing has a medium chamber for storing an ultrasonic wave transmission medium, and the ultrasonic transducer is located in the medium chamber;

[0014] The transmission assembly includes a transmission shaft extending along a first axis, the transmission shaft connecting the first motor and the output assembly. The first motor drives the transmission shaft to rotate along the first axis, so that the focus of the ultrasonic wave output by the ultrasonic transducer rotates around the first axis. The sensing part is disposed on the transmission shaft, and when the sensing part is located at the detection position, the sensing assembly is opposite to the sensing part.

[0015] In some embodiments, the axis of the ultrasonic transducer is inclined to the axis of the drive shaft, or the axis of the ultrasonic transducer is parallel to and spaced apart from the axis of the drive shaft.

[0016] In some embodiments, a mounting bracket is fixedly provided inside the housing, the drive shaft is at least partially rotatably mounted inside the mounting bracket, and the sensing component is mounted on the mounting bracket.

[0017] In some embodiments, the housing is provided with a medium shell, and the medium shell or the medium shell and the housing form the medium chamber. The output component is disposed in the medium chamber. The mounting bracket is located between the medium shell and the first motor. One end of the drive shaft extends out of the mounting bracket and is movably inserted into the medium shell to connect with the output component. The other end of the drive shaft is connected to the first motor.

[0018] In some embodiments, the sensing element is a magnetic component, and the sensing assembly includes a Hall sensor; and / or, the outer peripheral wall of the drive shaft is provided with a receiving groove, and the sensing element is disposed in the receiving groove; or, the outer peripheral wall of the drive shaft is provided with an annular groove coaxial with it, the sensing element is disposed on the inner sidewall of the annular groove, and the sensing assembly is located in the annular groove.

[0019] In some embodiments, the outer peripheral wall of the drive shaft is provided with an annular boss coaxial with it, the sensing part is an axial through hole on the annular boss, the sensing component includes a light emitter and a light receiver, the light emitter and the light receiver are distributed at intervals on opposite sides of the detection position along the axial direction of the drive shaft, when the axial through hole is located at the detection position, the light beam emitted by the light emitter passes through the axial through hole and reaches the light receiver.

[0020] In some embodiments, the sensing part is a protruding blocking part on the outer peripheral wall of the drive shaft, and the sensing component includes a light emitter and a light receiver. The light emitter and the light receiver are distributed at intervals on opposite sides of the detection position along the axial direction of the drive shaft. When the blocking part is located at the detection position, the blocking part is located between the light emitter and the light receiver, and the blocking part blocks the light beam emitted by the light emitter.

[0021] In some embodiments, the sensing part is a through hole on the outer peripheral wall of the drive shaft, and the sensing component includes a light emitter and a light receiver; when the through hole is located at the detection position, the light emitter is opposite to one end of the through hole, and the light receiver is opposite to the other end of the through hole, and the light beam emitted by the light emitter passes through the through hole to reach the light receiver.

[0022] In some embodiments, the sensing part is a protruding trigger part on the outer peripheral wall of the drive shaft, and the sensing component includes a micro switch. When the trigger part is located at the detection position, it touches the micro switch.

[0023] In some embodiments, there are multiple sensing elements, and the multiple sensing elements are distributed at circumferential intervals along the drive shaft; and / or,

[0024] The housing contains a main control board and a flexible circuit board electrically connected to the main control board, and the sensing components are disposed on the flexible circuit board.

[0025] In some embodiments, the drive shaft includes a coaxial first shaft segment and a second shaft segment, the first shaft segment and the second shaft segment are slidably connected in the axial direction, the first shaft segment and the second shaft segment are fixed relative to each other in other directions, the first motor is connected to the first shaft segment, and the output component is connected to the second shaft segment;

[0026] The skin treatment device also includes a drive device disposed in the housing. The drive device is connected to the second shaft segment for driving the second shaft segment to move along its axial direction, thereby driving the ultrasonic transducer to move closer to or away from the output window. The second shaft segment can rotate relative to the drive device.

[0027] The sensing element is located on the first shaft segment.

[0028] In some embodiments, the second shaft segment is provided with a drive position, and the drive device includes a second motor, a lead screw transmission module and a pusher. The pusher is rotatably connected to the drive position relative to the second shaft segment. The second motor is connected to the pusher through the lead screw transmission module to drive the pusher to move the second shaft segment along its axial direction.

[0029] In some embodiments, the transmission assembly includes a lead screw and a translation member screwed to the lead screw, a first motor connected to the lead screw, an output assembly connected to the translation member, a guide structure parallel to the lead screw provided in the housing, the translation member and the guide structure slidingly engaging in the longitudinal direction of the lead screw, the first motor driving the lead screw to rotate, so that the translation member drives the output assembly to move along the axial direction of the lead screw; the sensing part is provided on the outer peripheral wall of the lead screw, or on the translation member, or on the output assembly.

[0030] In some embodiments, the transmission assembly includes a gear and a rack meshing with the gear, a first motor is connected to the gear, the output assembly is connected to the rack, a guide structure parallel to the rack is provided inside the housing, the translation member slides with the guide structure in the length direction of the rack, the first motor drives the gear to rotate so that the rack drives the output assembly to move along the length direction of the rack; the sensing part is provided on the end face of the gear, the rack, or the output assembly.

[0031] In some embodiments, the output component includes an ultrasonic transducer with its output surface facing the output window, or the output component includes a laser module with its light output port facing the output window.

[0032] In some embodiments, the prompting component includes a vibration unit and / or a sound-emitting unit and / or a display screen.

[0033] The technical solution of this skin treatment device involves providing at least one sensing element on the transmission or output component. During use, the sensing element moves along with the transmission or output component. A sensing element is positioned at a detection location on the movement trajectory of the sensing element. When the sensing element is at the detection location, it is triggered. The controller can then determine the movement of the sensing element based on the triggering status of the sensing element, thus determining the operation of the transmission or output component and whether the first motor speed is abnormal. When the controller determines that the first motor speed is abnormal, it controls a prompting component to issue an abnormality warning, allowing the user to be aware of the equipment malfunction and stop using it. This effectively improves the safety of using the skin treatment device, preventing burns or scalds to the skin or deep tissues caused by using the device when the first motor speed is abnormal. Attached Figure Description

[0034] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the skin treatment device of this application;

[0035] Figure 2 for Figure 1 An enlarged view of position A in the middle;

[0036] Figure 3 This is a partial structural schematic diagram of an embodiment of the skin treatment device of this application;

[0037] Figure 4 for Figure 3 An enlarged view of position B in the middle;

[0038] Figure 5 This is a connection block diagram of the controller in one embodiment of the skin treatment device of this application;

[0039] Figure 6 for Figure 1 A schematic diagram of a portion of the cross-sectional structure shown;

[0040] Figure 7 This is a schematic diagram of the eccentrically configured ultrasonic transducer in one embodiment of this application.

[0041] Figure 8 This is a partial structural schematic diagram of an embodiment of the skin treatment device of this application;

[0042] Figure 9 This is a partial structural schematic diagram of an embodiment of the skin treatment device of this application;

[0043] Figure 10 This is a schematic diagram of the drive shaft in one embodiment of the skin treatment device of this application;

[0044] Figure 11This is a schematic diagram of an arrangement of the sensing components and sensing part of the skin treatment device of this application;

[0045] Figure 12 This is a schematic diagram of an arrangement of the sensing components and sensing part of the skin treatment device of this application;

[0046] Figure 13 This is a schematic diagram of an arrangement of the sensing components and sensing part of the skin treatment device of this application;

[0047] Figure 14 This is a schematic diagram of an arrangement of the sensing components and sensing part of the skin treatment device of this application. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0050] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0051] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0052] As a non-invasive skin treatment device, the core technology of ultrasonic beauty devices relies on the ultrasonic transducer generating focused ultrasound waves that act on deep skin tissues, achieving cosmetic effects such as tightening and lifting through thermal effects. To improve the efficiency of ultrasonic beauty device treatments, existing skin treatment devices (taking ultrasonic beauty devices as an example) use a motor combined with a transmission component to drive the ultrasonic transducer to move along a preset trajectory at a set speed (such as rotation or translation around an axis). This allows the ultrasonic waves output by the transducer to scan and apply points on the skin along the preset trajectory at a set speed, thereby expanding the coverage area of ​​the ultrasonic focus and shortening the application time per treatment. However, in actual use, existing ultrasonic beauty devices may experience abnormal motor speeds, such as the motor speed being lower than the set speed or the motor stalling (i.e., the speed is 0). When the motor speed is lower than the set speed, the ultrasonic transducer's action time on the same spot on the skin will be longer. When the motor stalls, the ultrasonic transducer stops moving to continue acting on the same spot on the skin. Both of these abnormal situations may lead to burns or scalds to the skin or deep tissues. Therefore, existing ultrasonic beauty devices pose a safety hazard.

[0053] In response to the aforementioned problems with ultrasonic beauty devices, the applicant of this application proposes a new solution for a skin treatment device that effectively solves the problem of potential burns or scalds to the skin or deep tissues when the motor speed of an ultrasonic beauty device malfunctions, thereby improving the safety of using the ultrasonic beauty device. The skin treatment device of this application can be an ultrasonic beauty device or a laser beauty device (such as a laser hair removal device, laser skin rejuvenation device, etc.).

[0054] Combined with reference Figures 1 to 5 The skin treatment device of this embodiment includes a housing 100, an output component 40, a transmission component 30, a first motor 10, a sensing component 20, a controller 50, a prompting component 60, and at least one sensing unit 70. The housing 100 is provided with an output window 11, which is used to fit the skin to be treated during treatment. The first motor 10, the transmission component 30, and the output component 40 are disposed inside the housing 100.

[0055] The output component 40 outputs energy to the output window 11 to act on the skin area corresponding to the output window 11, that is, the area of ​​the skin to be treated that the output window 11 is in contact with. The transmission component 30 is connected to the output component 40, and the first motor 10 is connected to the output component 40 through the transmission component 30, for driving the transmission component 30 to move and drive the output component 40 to move (move or rotate around an axis), so that the output component 40 performs scanning care on the skin area in contact with the output window 11.

[0056] The sensing unit 70 is disposed on the transmission assembly 30 or the output assembly 40, and moves together with the transmission assembly 30 or the output assembly 40. The sensing component 20 is set to a detection position, which is one of the positions on the movement trajectory of the sensing unit 70. When the sensing unit 70 is at the detection position, it will trigger the sensing component 20 to generate a corresponding trigger signal. That is, the sensing unit 70 will trigger the sensing device once each time it passes the detection position, and will continuously trigger the sensing component 20 when the sensing unit 70 stops at the detection position.

[0057] The controller 50 is electrically connected to the sensing component 20. When the sensing component 20 is triggered, it generates a corresponding trigger signal and sends it to the controller 50. The controller 50 can determine the triggering status of the sensing component 20 based on the received trigger signal. Then, the controller 50 determines the movement status of the sensing unit 70 (that is, the movement status of the transmission component 30 or the output component 40) based on the triggering status of the sensing component 20, thereby knowing the rotational speed of the first motor 10 and judging whether the rotational speed of the first motor 10 is abnormal.

[0058] When the first motor 10 is running at normal speed, the transmission component 30 and output component 40 move at normal speeds, and the sensing unit 70 also moves at normal speeds. At this time, the interval between the sensing unit 70 passing the detection position is the corresponding first preset time (e.g., 1 second, 2 seconds, 3 seconds, etc.), meaning the interval for triggering the sensing component 20 is the first preset time. If the speed of the first motor 10 is lower than the normal speed, the speed of the sensing unit 70 will also be lower than the normal speed, and the interval between the sensing unit 70 passing the detection position will be greater than the first preset time, meaning the interval for triggering the sensing component 20 will be greater than the first preset time. If the first motor 10 stalls (i.e., the shaft of the first motor 10 does not rotate, and the speed is 0), the transmission component 30, output component 40, and sensing unit 70 will all be stationary. In this case, if the sensing unit 70 is stationary at the detection position, the sensing component 20 will be continuously triggered; however, if the sensing unit 70 is not stationary at the detection position, the sensing component 20 will not be triggered.

[0059] In some embodiments, the controller 50 determines whether the motor speed is abnormal based on the triggering status of the sensing component 20, which may include the following steps:

[0060] Step 1: The controller 50 compares the trigger interval of the sensing component 20 with the first preset duration;

[0061] Step 2: When the trigger interval of the sensing component 20 is determined to be longer than the first preset duration, the controller 50 determines that the speed of the first motor 10 is too slow (i.e., lower than the normal speed, and the speed is abnormal).

[0062] Step 3: When it is determined that the duration of the non-triggered sensor component 20 is greater than the second preset duration (the second preset duration is greater than or equal to the first preset duration, for example, the second duration is 3 seconds, 4 seconds, 5 seconds, etc.), that is, the sensor component 20 has not been triggered for too long, the controller 50 determines that the first motor 10 is stalled (i.e., the speed is 0, the speed is abnormal).

[0063] Step 4: When it is determined that the duration of the sensor trigger is greater than the third preset duration (e.g., 1 second, 2 seconds, etc.), it indicates that the sensing unit 70 is stationary at the detection position, and the controller 50 determines that the first motor 10 is stalled.

[0064] Step 5: When the trigger interval of the sensing component 20 is determined to be less than the first preset duration, the controller 50 determines that the speed of the first motor 10 is too fast (i.e., higher than the normal speed, and the speed is abnormal).

[0065] Of course, in other embodiments, the controller 50 may determine whether the motor speed is abnormal based on the triggering status of the sensing component 20, or other alternative schemes may be used. For example, when the first motor 10 is running at a normal speed, the number of times the sensing unit 70 passes the detection position within a preset unit time (e.g., 2 seconds, 3 seconds, etc.) (i.e., the number of times the sensing component 20 is triggered) is a preset number; the controller 50 determines whether the motor speed is abnormal based on the triggering status of the sensing component 20, including: the controller 50 compares the number of times the sensing component 20 is triggered within the preset unit time with the preset number; if the number of times the sensing component 20 is triggered within the preset unit time is less than the preset number, the controller 50 determines that the first motor 10 is running too slowly; if the number of times the sensing component 20 is triggered within the preset unit time is 0, i.e., the sensing component 20 has not been triggered for too long, the controller 50 determines that the first motor 10 is stalled; if the number of times the sensing component 20 is triggered within the preset unit time is greater than the preset number, the controller 50 determines that the first motor 10 is running too fast.

[0066] The prompting component 60 is electrically connected to the controller 50. When the controller 50 determines that the speed of the first motor 10 is abnormal, it controls the prompting component 60 to issue an abnormal prompt.

[0067] In some embodiments, the prompting component 60 may include a vibration unit (such as a vibration motor) and / or a sound output unit (such as a speaker) and / or a display screen. The controller 50 controls the prompting component 60 to provide abnormal prompts, which may include: controlling the vibration unit to perform preset vibrations, such as controlling the vibration unit to vibrate with a preset vibration pattern and / or a preset vibration intensity; and / or controlling the sound output unit to broadcast a preset voice message (such as "device malfunction"); and / or controlling the display screen to display prompt information (such as displaying "device malfunction," displaying an abnormality indicator, etc.).

[0068] Of course, in some other embodiments, the prompting component 60 may also include other units, such as an indicator light unit. The controller 50 controls the prompting component 60 to provide abnormal prompts, and may also include controlling the indicator light to light up or flash.

[0069] In some embodiments, when the controller 50 determines that the speed of the first motor 10 is too low, it can control the output component 40 to stop output or reduce output in order to avoid burns or scalds to the skin or deep tissues caused by the output component 40 acting on the same position for too long.

[0070] In some embodiments, when the controller 50 determines that the first motor 10 is stalled, it controls the output component 40 to stop outputting and / or controls the first motor 10 to stop running. This avoids the output component 40 from continuously acting on the same position, which could cause burns or scalds to the skin or deep tissues, and also avoids the first motor 10 from being stalled for a long time, which could cause damage to the first motor 10.

[0071] The technical solution of the skin treatment device in this embodiment involves providing at least one sensing unit 70 on the transmission component 30 or the output component 40. During the use of the skin treatment device, the sensing unit 70 moves together with the transmission component 30 or the output component 40. A sensing component 20 is provided at the detection position on the movement trajectory of the sensing unit 70. When the sensing unit 70 is at the detection position, the sensing component 20 is triggered. In this way, the controller 50 can determine the movement of the sensing unit 70 based on the triggering of the sensing component 20, that is, determine the operation of the transmission component 30 or the output component 40, and then determine whether the speed of the first motor 10 is abnormal. When the controller 50 determines that the speed of the first motor 10 is abnormal, it controls the prompting component 60 to issue an abnormality prompt, so that the user is aware of the equipment malfunction and stops using it. In this way, the user is prevented from using the skin treatment device when the speed of the first motor 10 is abnormal, which could lead to burns or scalds to the skin or deep tissues, and the safety of using the skin treatment device is effectively improved.

[0072] Combined with reference Figures 6 to 8 In some embodiments, the output assembly 40 includes an ultrasonic transducer 41 with its output surface facing the output window 11, for outputting focused ultrasonic waves through the output window 11 to penetrate the skin to be treated. The housing 100 has a medium chamber 71 for storing an ultrasonic wave transmission medium, and the ultrasonic transducer 41 is located within the medium chamber 71. Thus, by using an ultrasonic wave transmission medium, the loss of ultrasonic waves generated by the ultrasonic transducer 41 during penetration into the skin to be treated can be reduced, thereby improving the effectiveness of skin care.

[0073] In some embodiments, the transmission assembly 30 includes a transmission shaft 31 extending along a first axis L1, i.e., the first axis L1 is the axis of the transmission shaft 31. The transmission shaft 31 connects the first motor 10 and the output assembly 40. The first motor 10 drives the transmission shaft 31 to rotate along the first axis L1, so that the ultrasonic focus output by the ultrasonic transducer 41 rotates around the first axis L1, so that the ultrasonic focus output by the ultrasonic transducer 41 can make circular motion at the same subcutaneous depth of the skin to be treated, thereby realizing the care of a large area of ​​the skin to be treated.

[0074] Since the output component 40 is located in the medium chamber 71 containing the ultrasonic medium, and considering the installation and setting of the sensing component 20, in this embodiment, the sensing part 70 is located on the drive shaft 31. This allows the sensing device to be positioned outside the medium chamber 71 corresponding to the sensing part 70, making installation and setting simpler and more convenient. When the sensing part 70 is in the detection position, the sensing component 20 is opposite to the sensing part 70, thereby triggering the sensing component 20 to generate a trigger signal that is fed back to the controller 50.

[0075] Reference Figure 6 In some embodiments, the axis L2 of the ultrasonic transducer 41 may be inclined to the axis (i.e., the first axis L1) of the transmission shaft 31, that is, the axis L2 of the ultrasonic transducer 41 may be inclined to the first axis L1, so that the ultrasonic focus of the ultrasonic transducer 41 is misaligned with the first axis L1.

[0076] Reference Figure 7 In some embodiments, the axis L2 of the ultrasonic transducer 41 may be parallel and spaced apart from the axis of the transmission shaft 31, that is, the ultrasonic transducer 41 may be eccentrically set with respect to the first axis L1, so that the ultrasonic focus of the ultrasonic transducer 41 is misaligned with the first axis L1.

[0077] By misaligning the ultrasonic focus of the ultrasonic transducer 41 with the first axis L1, the ultrasonic focus of the ultrasonic transducer 41 will make circular motion around the first axis L1 when the first motor 10 drives the transmission shaft 31 to rotate.

[0078] It should be noted that when the skin treatment device is working, it can form ultrasonic focal points that are continuously distributed around the first axis L1, or it can form ultrasonic focal points that are intermittently distributed around the first axis L1.

[0079] Combined with reference Figures 1 to 4 as well as Figure 8In some embodiments, a mounting bracket 200 is fixedly provided inside the housing 100, and at least part of the drive shaft 31 is rotatably mounted within the mounting bracket 200. The sensing component 20 is mounted on the mounting bracket 200. The mounting bracket 200 stabilizes the drive shaft 31, making its rotation more stable and reliable, ensuring a stable transmission effect to the output component 40. This results in a stable trajectory of the ultrasonic focus of the ultrasonic transducer 41 and a stable skin care effect. Furthermore, since at least part of the drive shaft 31 is located within the mounting bracket 200, the sensing element 70 can be located on the portion of the drive shaft 31 within the mounting bracket. This allows the sensing component 20 to be directly mounted on the mounting bracket 200, achieving a corresponding arrangement with the sensing element 70 on the drive shaft 31, facilitating the installation of the sensing component 20.

[0080] Reference Figure 8 In some embodiments, the mounting bracket 200 may include a first horizontal plate 21, a second horizontal plate 22, and a surrounding plate 23. The first horizontal plate 21 and the second horizontal plate 22 are spaced apart along a first axis L1. The surrounding plate 23 is arranged circumferentially around the drive shaft 31 and is also connected to the first horizontal plate 21 and the second horizontal plate 22, such that the drive shaft 31 is at least partially rotatably mounted within the mounting bracket 200.

[0081] Reference Figure 1 and Figure 6 In some embodiments, a dielectric shell 700 is provided within the housing 100, and a dielectric chamber 71 is formed between the dielectric shell 700 and the housing 100, with the output component 40 disposed within the dielectric chamber 700. It is understood that, on the one hand, the housing 100 may form part of the inner wall of the dielectric chamber 71, or the housing 100 may not form the inner wall of the dielectric chamber 71; this application embodiment does not limit this. On the other hand, the dielectric shell 700 and the housing 100 may be integrally formed or separately formed; this application embodiment also does not limit this.

[0082] The mounting bracket 200 is located between the media housing 700 and the first motor 10. The output window 11 of the skin treatment device, the media housing 700, the mounting bracket 200, and the first motor 10 are arranged sequentially along the first axis L1. One end of the drive shaft 31 extends out of the mounting bracket 200 and is movably inserted into the media housing 700 to connect with the output assembly 40. Specifically, one end of the drive shaft 31 can rotatably extend into the media housing 700. The output assembly 40 is connected to the end of the drive shaft 31 that extends into the media housing 700, while the other end of the drive shaft 31 is connected to the first motor 10. The portion of the drive shaft 31 located outside the media housing 700 and between it and the first motor 10 is rotatably mounted on the mounting bracket 200. The first motor 10 can be mounted and fixed on the end of the mounting bracket 200 away from the media housing 700 (e.g., on the second horizontal plate 22) or it can be mounted and fixed to the housing 100.

[0083] Reference Figure 9 and Figure 10 In some embodiments, the drive shaft 31 includes a coaxial first shaft segment 311 and a second shaft segment 312. The first shaft segment 311 and the second shaft segment 312 are slidably connected in the axial direction (i.e., in the direction of the first axis L1), meaning that the drive shaft 31 can extend and retract in its axial direction. The first shaft segment 311 and the second shaft segment 312 are relatively fixed in other directions, meaning that the first shaft segment 311 and the second shaft segment 312 will not have relative movement in other directions (such as radial, circumferential, etc.) except for relative sliding in the axial direction, ensuring the coaxial synchronous rotation of the first shaft segment 311 and the second shaft segment 312. The first motor 10 is connected to the first shaft segment 311 (i.e., connected to the end of the first shaft segment 311 away from the second shaft segment 312), and the output component 40 is connected to the second shaft segment 312 (i.e., connected to the end of the second shaft segment 312 away from the first shaft segment 311).

[0084] Reference Figure 2 and Figure 10 In some embodiments, the first shaft segment 311 is provided with a transmission hole 3111 at one end near the second shaft segment 312, and the second shaft segment 312 is provided with a transmission end 3122 at one end near the first shaft segment 311. The transmission end 3122 is a non-cylindrical structure (e.g., a square prism, an elliptical prism, a triangular prism, etc.). The transmission end 3122 is adapted to be inserted into the transmission hole 3111 to realize the sliding connection between the second shaft segment 312 and the first shaft segment 312, so that the second shaft segment 312 can move along the first axis L1 relative to the first shaft segment 311 but cannot rotate around the first axis L1.

[0085] Combined with reference Figure 1 , Figure 8 and Figure 9In some embodiments, the skin treatment device further includes a drive device 80 disposed in the housing 100. The drive device 80 is driveably connected to the second shaft segment 312 and is used to drive the second shaft segment 312 to move along its axial direction (i.e., in the direction of the first axis L1), that is, to drive the transmission shaft 31 to extend and retract, thereby causing the ultrasonic transducer 41 to move closer to or away from the output window 101. Furthermore, the second shaft segment 312 can rotate relative to the drive device 80, that is, the second shaft segment 312 and the drive device 80 are driveably rotatable. The drive device 80 will not obstruct the rotation of the transmission shaft 31 and will not affect the normal drive of the transmission shaft 31 by the first motor 10.

[0086] On the one hand, by moving the second shaft segment 312 along the first axis L1, the ultrasonic transducer 41 can be moved closer to or further away from the output window 11. Thus, when the output window 11 is close to or in contact with the skin to be treated (i.e., when the skin care device is working), the ultrasonic focus of the ultrasonic transducer 41 can be adjusted to be at different depths within the skin to be treated, allowing for ultrasonic skin care at different subcutaneous depths. On the other hand, by rotating the drive shaft 31 around the first axis L1, the ultrasonic focus of the ultrasonic transducer 41 can be driven to rotate around the first axis L1, allowing the ultrasonic focus of the ultrasonic transducer 41 to act on different locations at the same depth within the skin to be treated, enabling ultrasonic skin care at the same subcutaneous depth. Therefore, in this embodiment, the position of the ultrasonic focus of the ultrasonic transducer 41 can be adjusted via the drive shaft 31 to achieve ultrasonic skin care at different locations within the skin to be treated, both at the same depth and at different depths.

[0087] Reference Figure 2 and Figure 9 In some embodiments, the sensing unit 70 is disposed on the first shaft segment 311. Since the driving device 80 drives the second shaft segment 312 to move axially, and the first shaft segment 311 does not move axially, by disposing the sensing unit 70 on the first shaft segment 311, even if the driving device 80 drives the second shaft segment 312 to move axially, the sensing unit 70 will not move axially. The movement trajectory of the sensing unit 70 is fixed, that is, the detection position is fixed, thus ensuring that the sensing unit 70 triggers the sensing component 20.

[0088] Of course, in some other embodiments, the sensing part 70 may also be disposed on the second shaft segment 312. When the sensing part 70 is disposed on the second shaft segment 312, the dimension of the sensing part 70 in the first axis L1 direction can be set to be longer. In this way, when the driving device 80 drives the second shaft segment 312 to move axially, although the axial direction of the transmission shaft 31 is moved, the sensing part 70 is still able to rotate to the same position and still have part of it facing the sensing component 20 to keep triggering the sensing component 20.

[0089] Reference Figure 9 and Figure 10 In some embodiments, a drive position 3121 is provided on the second shaft segment 312, and the drive position 3121 is located on the portion of the second shaft segment 312 that is not inserted into the medium chamber 71. The drive device 80 includes a second motor 81, a lead screw drive module 82, and a pusher 83. The pusher 83 is rotatably connected to the drive position 3121 relative to the second shaft segment 312. The second motor 81 is connected to the pusher 83 through the lead screw drive module 82 to drive the pusher 83 to push the second shaft segment 312 to move axially.

[0090] The pusher 83 and the drive position 3121 can be connected in a separable manner through magnetic connection, negative pressure adsorption, clutch assembly, etc., so that the pusher 83 can move along the first axis L1 to push the second shaft segment 312 to move along the first axis L1, and the second shaft segment 312 can also rotate relative to the pusher 83 around the first axis L1.

[0091] Of course, the pusher 83 can also cooperate with the drive bit 3121 in other ways.

[0092] For example, the drive position 3121 includes an annular transmission groove located on the outer periphery of the second shaft segment 312. The pusher 83 is partially rotatably engaged within the transmission groove relative to the second shaft segment 312 to form a transmission connection. Thus, since the pusher 83 is partially engaged within the transmission groove, when the pusher 83 moves along the first axis L1, it can push the groove wall of the transmission groove, causing the second shaft segment 312 to move along the first axis L1. Simultaneously, since the pusher 83 is rotatably disposed relative to the second shaft segment 312, the second shaft segment 312 can also rotate around the first axis L1, allowing the pusher 83 to engage at different circumferential positions within the transmission groove, thereby preventing interference between the rotation of the pusher 83 and the second shaft segment 312.

[0093] In some embodiments, the lead screw drive module 82 includes a lead screw and a lead screw nut screwed onto the lead screw. The lead screw nut is connected to the pusher 83, and the lead screw is drively connected to the output shaft of the second motor 81. Therefore, the lead screw drive module 82 can improve the accuracy of the movement of the pusher 83 driven by the second motor 81.

[0094] It should be noted that the lead screw nut and the pusher 83 can be integrally formed or separately formed, and this application embodiment does not limit this.

[0095] Reference Figure 9 In some embodiments, the drive device 80 further includes a gear reduction module 84, and the output shaft of the second motor 81 and the lead screw are connected by the gear reduction module 84. Therefore, because the gear reduction module 84 and the lead screw drive module 82 are added to the transmission chain between the second motor 81 and the second shaft segment 312, the accuracy of the second motor 81 driving the second shaft segment 312 can be improved twice, thereby improving the adjustment accuracy of the ultrasonic transducer 41.

[0096] In some embodiments, the lead screw drive module 82 is fixedly mounted to the mounting bracket 200, the gear reduction module 84 is fixedly mounted to the lead screw drive module 82, and the second motor 81 is fixedly mounted to the gear reduction module 84. Therefore, in the actual assembly process, the second motor 81, the lead screw drive module 82, and the gear reduction module 84 can be installed as a single unit on the mounting bracket 200 to improve the assembly efficiency of the skin care device.

[0097] In some embodiments, the drive device 80 further includes a second sensor for detecting the position information of the lead screw nut. By using the position information of the lead screw nut detected by the second sensor as feedback, the second motor 81 can drive the second shaft segment 312 to move more accurately, thereby improving the adjustment accuracy of the ultrasonic transducer 41.

[0098] In some embodiments, the sensing element 70 is a magnetic element (such as a magnet), and the sensing assembly 20 includes a Hall sensor. When the sensing element 70 moves to the detection position, the sensing element 70 is opposite to the detection assembly. That is, when the magnetic element is in the detection position, the magnetic element is opposite to the Hall sensor. At this time, the Hall sensor will sense the change in magnetic field and generate a sensing signal (i.e., a trigger signal) to be fed back to the controller 50.

[0099] In some embodiments, a receiving groove is provided on the outer peripheral wall of the drive shaft 31, and the sensing part 70 is disposed in the receiving groove, such as a magnetic component being directly disposed in the receiving groove. By providing a receiving groove, the sensing part 70 is directly disposed in the receiving groove, which not only ensures the installation stability of the sensing part 70 and the drive shaft 31, but also avoids the installation difficulty of mounting the sensing part 70 on the surface of the drive shaft 31, and allows the sensing part 70 to occupy no additional space.

[0100] Reference Figure 11 In some embodiments, an annular groove 302 coaxial with the outer peripheral wall of the drive shaft 31 is provided, the sensing part 70 is disposed on the inner side wall of the annular groove 302, and the sensing component 20 is located in the annular groove 302. In this way, the structure of the sensing component 20 and the sensing part 70 can be more compact, reducing space occupation, while ensuring the sensing sensitivity of the sensing component 20 to the sensing part 70.

[0101] Reference Figure 12 In some embodiments, an annular boss 301 coaxial with the outer peripheral wall of the drive shaft 31 is provided. The sensing part 70 is an axial through hole on the annular boss 301. The sensing component 20 includes a light emitter 201 and a light receiver 202, that is, the sensing component 20 is a light sensor (infrared sensor or visible light sensor). The light emitter 201 and the light receiver 202 are distributed at intervals along the axial direction of the drive shaft 31 on opposite sides of the detection position. When the axial through hole (i.e., the sensing part 70) is in the detection position, the light beam emitted by the light emitter 201 passes through the axial through hole and reaches the light receiver 202, thus triggering the sensing component 20. The light receiver 202 generates a corresponding first electrical signal to the controller 50. When the axial through hole is not in the detection position, the light beam emitted by the light emitter 201 is blocked by the annular boss 301, and the light receiver 202 cannot receive the light beam. At this time, the sensing component 20 is not triggered, and the light receiver 202 generates a corresponding second electrical signal to the controller 50.

[0102] Reference Figure 13 In some embodiments, the sensing part 70 is a protruding blocking part on the outer peripheral wall of the drive shaft 31. The sensing component 20 includes a light emitter 201 and a light receiver 202, which are spaced apart along the axial direction of the drive shaft 31 on opposite sides of the detection position. When the blocking part is in the detection position, it is located between the light emitter 201 and the light receiver 202, blocking the light beam emitted by the light emitter 201. At this time, the sensing component 20 is triggered, and the light receiver 202 generates a corresponding second electrical signal to the controller 50. When the blocking part is not in the detection position, the light beam emitted by the light emitter 201 is not blocked by the blocking part. At this time, the sensing component 20 is not triggered, and the light receiver 202 receives the light beam emitted by the light emitter 201, generating a corresponding first electrical signal to the controller 50.

[0103] Reference Figure 14 In some embodiments, the sensing part 70 is a through hole on the outer peripheral wall of the drive shaft 31. This through hole can be a radial hole or a non-radial hole in the drive shaft 31. The sensing component 20 includes a light emitter 201 and a light receiver 202. When the through hole is in the detection position, the light emitter 201 is opposite to one end of the through hole, and the light receiver 202 is opposite to the other end of the through hole. The light beam emitted by the light emitter 201 passes through the through hole and reaches the light receiver 202, triggering the sensing component 20. The light receiver 202 then generates a corresponding first electrical signal to the controller 50. When the through hole is not in the detection position, the light beam emitted by the light emitter 201 is blocked by the drive shaft 31, and the light receiver 202 cannot receive the light beam. At this time, the sensing component 20 is not triggered, and the light receiver 202 generates a corresponding second electrical signal to the controller 50.

[0104] In some embodiments, the sensing part 70 is a protruding trigger part on the outer peripheral wall of the drive shaft 31. The sensing component 20 includes a micro switch. When the trigger part is in the detection position, the trigger part is opposite to the micro switch, and the trigger part touches the micro switch to trigger it. The micro switch then generates a trigger signal to the controller 50. When the trigger part is not in the detection position, the trigger part does not touch the micro switch, the micro switch is not triggered, and no signal is fed back to the controller 50, or a no-trigger signal is fed back to the controller 50.

[0105] Of course, in other embodiments, the sensing component 20 and the sensing part 70 may be other combinations.

[0106] In some embodiments, there are multiple sensing units 70, which are distributed circumferentially along the drive shaft 31. Thus, during one revolution of the drive shaft 31, multiple sensing units 70 will pass the detection position once, triggering the sensing component 20 multiple times. Therefore, before the first motor 10 has completed one revolution of the drive shaft 31, the controller 50 will receive the trigger signal from the sensing component 20, allowing for a faster determination of whether the speed of the first motor 10 is abnormal.

[0107] In some embodiments, the housing 100 includes a main control board 102 and a flexible circuit board 103 electrically connected to the main control board 102, with the sensing component 20 disposed on the flexible circuit board 103. Since the sensing component 20 has very few components, typically only one or two, adding a separate rigid circuit board to the sensing component 20 would increase the space occupied inside the housing 100 and make installation inconvenient. However, by using the flexible circuit board 103, which can be bent and deformed, it can fit the narrow space inside the housing 100, making the installation of the sensing component 20 more convenient and eliminating the need for additional wires, thus simplifying the overall wiring structure inside the housing 100.

[0108] In some embodiments, the transmission assembly 30 may include a lead screw and a translation member screwed to the lead screw, a first motor 10 connected to the lead screw, an output assembly 40 connected to the translation member, and a guide structure (e.g., a guide rod or a guide groove, etc.) parallel to the lead screw is provided inside the housing 100. The translation member and the guide structure are slidably engaged in the length direction of the lead screw. The first motor 10 drives the lead screw to rotate, so that the translation member moves along the axial direction of the lead screw with the output assembly 40 under the guiding and limiting action of the guide structure. The sensing part 70 may be provided on the outer peripheral wall of the lead screw, on the translation member, or on the output assembly 40. Thus, the controller 50 can determine the rotational speed of the lead screw, the moving speed of the translation component, or the moving speed of the output component 40 based on the triggering status of the sensing component 20 (such as the triggering interval or the triggering frequency). Since the rotational speed of the first motor 10 and the rotational speed of the lead screw, the moving speed of the translation component, or the moving speed of the output component 40 have a fixed conversion relationship, the controller 50 can determine whether the rotational speed of the first motor 10 is abnormal (too slow, too fast, or stalled) by comparing and analyzing the triggering interval or the triggering frequency.

[0109] In some embodiments, the transmission assembly 30 may include a gear and a rack meshing with the gear. The first motor 10 is connected to the gear, and the output assembly 40 is connected to the rack. The housing 100 is provided with a guide structure parallel to the rack (e.g., the guide structure may be a guide rod or a guide groove, etc.). The translation member and the guide structure slide in the length direction of the rack. The first motor 10 drives the gear to rotate, so that the rack moves along the length direction of the rack with the output assembly 40 under the guiding and limiting action of the guide structure. The sensing part 70 may be provided on the end face of the gear, on the rack, or on the output assembly 40. Thus, the controller 50 can determine the rotational speed of the gear, the moving speed of the rack, or the moving speed of the output component 40 based on the triggering status of the sensing component 20 (such as the triggering interval or the triggering frequency). Since the rotational speed of the first motor 10 and the rotational speed of the gear, the moving speed of the rack, or the moving speed of the output component 40 are in a fixed conversion relationship, the controller 50 can determine whether the rotational speed of the first motor 10 is abnormal (too slow, too fast, or stalled) by comparing and analyzing the triggering interval or the triggering frequency.

[0110] In some embodiments, the output component 40 may include an ultrasonic transducer 41 with its output surface facing the output window 11, i.e., the skin treatment device is an ultrasonic beauty instrument. The first motor 10 drives the ultrasonic transducer 41 to move by driving the transmission component 30, so that the ultrasonic transducer 41 outputs the ultrasonic waves through the output window 11 to perform a moving scan on the skin to be treated.

[0111] In some embodiments, the output component 40 may also be a laser module including a light outlet facing the output window 11. For example, the skin treatment device is a laser beauty instrument. The first motor 10 drives the transmission component 30 to move the laser module, so that the laser beauty instrument outputs a laser spot through the output window 11 to perform a moving scan on the skin to be treated.

[0112] The above description is only a part or preferred embodiment of this application. Neither the text nor the drawings should limit the scope of protection of this application. All equivalent structural transformations made using the content of this application's specification and drawings under the overall concept of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A skin treatment device, characterized in that, include: The casing is equipped with an output window; An output component, disposed within the housing, is used to output energy toward the output window to act on the skin area corresponding to the output window; A transmission assembly is disposed within the housing, and the transmission assembly is connected to the output assembly; A first motor is disposed inside the housing. The first motor is connected to the output component through the transmission component and is used to drive the transmission component to move so as to drive the output component to move. At least one sensing element is provided in the transmission assembly or the output assembly; A sensing component is provided, which is set to a detection position. The sensing component is triggered when the motion trajectory of the sensing part passes through the detection position and the sensing part is located at the detection position. A controller is electrically connected to the sensing component, and the controller determines whether the speed of the first motor is abnormal based on the triggering status of the sensing component. The prompting component is electrically connected to the controller. When the controller determines that the speed of the first motor is abnormal, it controls the prompting component to issue an abnormal prompt.

2. The skin treatment device according to claim 1, characterized in that, The output component includes an ultrasonic transducer with its output surface facing the output window, for outputting ultrasonic waves through the output window to penetrate the skin to be treated; the housing has a medium chamber for storing ultrasonic wave transmission medium, and the ultrasonic transducer is located in the medium chamber. The transmission assembly includes a transmission shaft extending along a first axis, the transmission shaft connecting the first motor and the output assembly. The first motor drives the transmission shaft to rotate along the first axis, so that the focus of the ultrasonic wave output by the ultrasonic transducer rotates around the first axis. The sensing part is disposed on the transmission shaft, and when the sensing part is located at the detection position, the sensing assembly is opposite to the sensing part.

3. The skin treatment device according to claim 2, characterized in that, The axis of the ultrasonic transducer is inclined to the axis of the drive shaft, or the axis of the ultrasonic transducer is parallel to and spaced apart from the axis of the drive shaft.

4. The skin treatment device according to claim 2, characterized in that, A mounting bracket is fixedly provided inside the housing, the drive shaft is at least partially rotatably mounted inside the mounting bracket, and the sensing component is mounted on the mounting bracket.

5. The skin treatment device according to claim 4, characterized in that, The housing contains a medium shell, and the medium shell or the medium shell and the housing form the medium chamber. The output component is disposed in the medium chamber. The mounting bracket is located between the medium shell and the first motor. One end of the drive shaft extends out of the mounting bracket and is movably inserted into the medium shell to connect with the output component. The other end of the drive shaft is connected to the first motor.

6. The skin treatment device according to claim 2, characterized in that, The sensing element is a magnetic component, and the sensing assembly includes a Hall sensor; and / or, the outer peripheral wall of the drive shaft is provided with a receiving groove, and the sensing element is disposed in the receiving groove; or, the outer peripheral wall of the drive shaft is provided with an annular groove coaxial with it, the sensing element is disposed on the inner side wall of the annular groove, and the sensing assembly is located in the annular groove. Alternatively, the outer peripheral wall of the drive shaft is provided with an annular boss coaxial with it, the sensing part is an axial through hole on the annular boss, the sensing component includes a light emitter and a light receiver, the light emitter and the light receiver are distributed at intervals on opposite sides of the detection position along the axial direction of the drive shaft, when the axial through hole is located at the detection position, the light beam emitted by the light emitter passes through the axial through hole and reaches the light receiver; Alternatively, the sensing part is a protruding blocking part on the outer peripheral wall of the transmission shaft. The sensing component includes a light emitter and a light receiver. The light emitter and the light receiver are distributed at intervals on opposite sides of the detection position along the axial direction of the transmission shaft. When the blocking part is located at the detection position, the blocking part is located between the light emitter and the light receiver, and the blocking part blocks the light beam emitted by the light emitter. Alternatively, the sensing part is a through hole on the outer peripheral wall of the drive shaft, and the sensing component includes a light emitter and a light receiver; when the through hole is located at the detection position, the light emitter is opposite to one end of the through hole, and the light receiver is opposite to the other end of the through hole, and the light beam emitted by the light emitter passes through the through hole to reach the light receiver; Alternatively, the sensing part is a protruding trigger part on the outer peripheral wall of the transmission shaft, and the sensing component includes a micro switch. When the trigger part is located at the detection position, it touches the micro switch.

7. The skin treatment device according to claim 2, characterized in that, The sensing element is a plurality of units, which are distributed at circumferential intervals along the drive shaft; and / or, The housing contains a main control board and a flexible circuit board electrically connected to the main control board, and the sensing components are disposed on the flexible circuit board.

8. The skin treatment device according to any one of claims 2 to 7, characterized in that, The drive shaft includes a coaxial first shaft segment and a second shaft segment, the first shaft segment and the second shaft segment are slidably connected in the axial direction, the first shaft segment and the second shaft segment are fixed relative to each other in other directions, the first motor is connected to the first shaft segment, and the output component is connected to the second shaft segment; The skin treatment device also includes a drive device disposed in the housing. The drive device is connected to the second shaft segment for driving the second shaft segment to move along its axial direction, thereby driving the ultrasonic transducer to move closer to or away from the output window. The second shaft segment can rotate relative to the drive device. The sensing element is located on the first shaft segment.

9. The skin treatment device according to claim 8, characterized in that, The second shaft segment is provided with a drive position. The drive device includes a second motor, a lead screw transmission module and a pusher. The pusher is rotatably connected to the drive position relative to the second shaft segment. The second motor is connected to the pusher through the lead screw transmission module to drive the pusher to move the second shaft segment along its axial direction.

10. The skin treatment device according to claim 1, characterized in that, The transmission assembly includes a lead screw and a translation component screwed to the lead screw. A first motor is connected to the lead screw, and an output component is connected to the translation component. A guide structure parallel to the lead screw is provided inside the housing. The translation component and the guide structure are slidably engaged in the length direction of the lead screw. The first motor drives the lead screw to rotate, so that the translation component drives the output component to move along the axial direction of the lead screw. The sensing part is provided on the outer peripheral wall of the lead screw, the translation component, or the output component. Alternatively, the transmission assembly includes a gear and a rack meshing with the gear, a first motor connected to the gear, an output assembly connected to the rack, a guide structure parallel to the rack within the housing, a translation member slidingly engaging with the guide structure along the length of the rack, and the first motor driving the gear to rotate so that the rack moves the output assembly along the length of the rack; the sensing element is located on the end face of the gear, the rack, or the output assembly; and / or, The output component includes an ultrasonic transducer with its output surface facing the output window, or the output component includes a laser module with its light output port facing the output window; and / or, The prompting component includes a vibration unit and / or a sound-emitting unit and / or a display screen.

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