Electric toothbrush with light control device and control method of electric toothbrush

Abstract

An electric toothbrush with a light control device and a control method for the electric toothbrush are provided. The electric toothbrush includes a brush head, a motor assembly and a circuit board. The motor assembly includes a drive motor. The drive motor drives the brush head and is electrically connected to the circuit board. When the brush head is subjected to an external force, the drive motor is driven to shift. The light control device includes a light source and a light sensing element. The motor assembly also includes a linkage. The linkage is linked with the drive motor and changes the light flux between the light source and the light sensing element under the drive of the drive motor. The light source and the light sensing element are electrically connected to the circuit board. The circuit board controls the drive motor according to the signal fed back by the light sensing element. The electric toothbrush controls the electric toothbrush based on the change of the light signal rather than the pressure signal. The change of the light signal is easily sensed by the light sensing element. The electric toothbrush has a high control sensitivity and is less difficult to manufacture. It is possible to automatically control the electric toothbrush in multiple working modes, such as a normal working mode, a non-working mode and an alarm mode.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric toothbrushes, and in particular to an electric toothbrush with a light control device and a control method of the electric toothbrush. Background Art

[0002] For traditional electric toothbrushes, before the electric brush head enters the oral cavity, the user needs to turn on the electric toothbrush so that the brush head starts to vibrate before entering the oral cavity. In this way, the toothpaste may fall and splash due to the vibration of the brush head. When using an electric toothbrush, the electric toothbrush will generally remain in a vibrating state until the end of brushing. In the middle of brushing, when the user moves the brush head outside the oral cavity, the electric toothbrush will also remain in a vibrating state, and the toothpaste foam on the brush head will splash due to the vibration of the electric toothbrush. The toothpaste foam splashes onto the sink, the user's clothes, etc., and the user needs to clean it, which brings inconvenience to the user and is not conducive to environmental hygiene.

[0003] In addition, during the process of brushing teeth, users often use excessive force, which affects the cleaning effect of the toothbrush bristles on the tooth surface and even causes damage to the oral cavity, which is not good for oral health.

[0004] Some electric toothbrushes are equipped with pressure sensors, which sense the pressure generated by the motor assembly when the brush head is subjected to force, thereby sensing the working state of the electric toothbrush and controlling the electric toothbrush. Such electric toothbrushes have high requirements for the installation of pressure sensors. For example, the position of the pressure sensor must be able to ensure contact with the motor assembly when it shifts. This results in the poor effect of detecting pressure in such electric toothbrushes with pressure sensors. For example, it may not be detected when the brush head is slightly subjected to force, and the electric toothbrush cannot be started when the user applies less force. Summary of the invention

[0005] The present disclosure is made in view of the above-mentioned state of the prior art. The purpose of the present disclosure is to provide an electric toothbrush with a light control device and a control method of the electric toothbrush, which can automatically control the working state of the electric toothbrush, has high sensitivity and low manufacturing difficulty.

[0006] An electric toothbrush with a light control device is provided, which includes a brush head, a motor assembly and a circuit board, the motor assembly includes a drive motor, the drive motor drives the brush head and is electrically connected to the circuit board, the brush head drives the drive motor to shift when subjected to an external force, the light control device includes a light source and a light sensing element, the motor assembly also includes a linkage, the linkage is linked to the drive motor and changes the luminous flux between the light source and the light sensing element under the drive of the drive motor, the light source and the light sensing element are electrically connected to the circuit board, and the circuit board controls the drive motor according to a signal fed back by the light sensing element.

[0007] Preferably, one end of the drive motor is connected to the brush head, and the other end of the drive motor is connected to the linkage, and the linkage mounts the other end of the drive motor to the handle of the electric toothbrush. The linkage has a light channel for light emitted by the light source to pass through, and when the linkage moves with the drive motor, the light channel is displaced or blocked or opened so that the luminous flux changes.

[0008] Preferably, the brush handle has a connection portion connected to one end of the drive motor, the linkage part, the drive motor and the brush head form an integral structure of a lever with the connection portion as a fulcrum, the brush head and the part of the drive motor located on the brush head side of the connection portion form a first lever arm, and the linkage part and the part of the drive motor located on the linkage part side of the connection portion form a second lever arm.

[0009] Preferably, the brush head has bristles, the brush head is located at one end of the lever, and the distance between the bristles and the connecting portion is smaller than the distance between the light channel and the connecting portion.

[0010] Preferably, the linkage comprises a first part located axially outside the drive motor and a second part externally mounted on the drive motor, the first part having the light channel, and when the linkage moves with the drive motor, the light channel is displaced to change the light flux.

[0011] Preferably, the linkage comprises a first part located axially outside the drive motor and a second part externally disposed on the drive motor, the second part being cylindrical and having the light channel, and when the drive motor stops, the light channel is blocked by the drive motor, and when the linkage moves with the drive motor, the light channel is opened.

[0012] Preferably, the light source and the light sensing element are arranged opposite to each other in the front-rear direction of the brush head, and the light channel extends along the front-rear direction of the brush head.

[0013] Preferably, the light source includes an LED lamp bead, and the light sensing element includes a photoresistor; or, the light source includes a laser transmitter, and the light sensing element includes a laser receiver.

[0014] Preferably, the light control device comprises a light beam sleeve, the light beam sleeve is made of a light-proof material, and the light beam sleeve is placed outside the light sensing element, so that the light sensing element only receives light from the light source.

[0015] A control method for an electric toothbrush is also provided. The electric toothbrush is an electric toothbrush according to any one of the above technical solutions, and the control method comprises:

[0016] When the brush head is not subjected to force, the circuit board does not start the drive motor according to the feedback of the optical sensor element; and

[0017] When the amount of light sensed by the light sensing element reaches a trigger value preset by the circuit board, the circuit board controls the drive motor to start according to the feedback of the light sensing element; and / or

[0018] When the amount of light sensed by the light sensor element reaches the alarm value preset by the circuit board, the circuit board controls the drive motor to change the speed or stop according to the feedback of the light sensor element, and / or controls the indicator light to flash, and / or controls the alarm to sound an alarm.

[0019] The above technical solution provided by the present disclosure has at least the following beneficial effects:

[0020] It can realize automatic control of the electric toothbrush in multiple working modes, such as normal working mode, non-working mode and alarm mode. It can automatically control the electric toothbrush to vibrate only after entering the mouth, and stop vibrating after leaving the mouth without force, to prevent toothpaste from splashing. It can also standardize usage habits so that users can control the force of brushing teeth well. Moreover, the electric toothbrush is controlled based on the change of light signal rather than pressure signal. The change of light signal is easily sensed by the light sensor element. The electric toothbrush has a higher control sensitivity and is less difficult to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the exploded view of the first and second embodiments of the electric toothbrush provided by the present disclosure, in which the brush head is omitted.

[0022] Figure 2 It is a partial longitudinal sectional view of the first embodiment of the electric toothbrush.

[0023] Figure 3a for Figure 2 The mechanical diagram of the electric toothbrush before the brush head is subjected to force.

[0024] Figure 3b for Figure 2 The mechanical diagram of the electric toothbrush after the brush head is subjected to force.

[0025] Figure 4 It is a partial longitudinal sectional view of the second embodiment of the electric toothbrush.

[0026] Figure 5a for Figure 4 The mechanical diagram of the electric toothbrush before the brush head is subjected to force.

[0027] Figure 5b for Figure 4 The mechanical diagram of the electric toothbrush after the brush head is subjected to force.

[0028] Figure 6 It is a partial longitudinal sectional view of the third embodiment of the electric toothbrush.

[0029] Figure 7a for Figure 6 The mechanical diagram of the electric toothbrush before the brush head is subjected to force.

[0030] Figure 7b for Figure 6 The mechanical diagram of the electric toothbrush after the brush head is subjected to force.

[0031] Description of reference numerals:

[0032] 1 brush handle, 2 button, 3 bottom cover, 4 switch, 5 first circuit board, 6 first elastic part, 7 drive motor, 8 linkage part, 9 waterproof soft rubber, 10 light beam sleeve, 11 second elastic part, 12 second circuit board, 13 fixing frame, 14 battery, 15 brush head, 16 LED lamp beads, 16A laser transmitter, 17 photoresistor, 17A laser receiver, 18 optical channel, 181 light inlet, 182 light outlet. DETAILED DESCRIPTION

[0033] The exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present disclosure, and are not intended to exhaust all possible ways of the present disclosure, nor to limit the scope of the present disclosure.

[0034] like Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown, the present disclosure provides an electric toothbrush with a light control device, the electric toothbrush comprises a brush head 15, a brush handle 1, a motor assembly, a battery 14 and a fixing frame 13. The motor assembly comprises a driving motor 7 and a linkage member 8 linked with the driving motor 7.

[0035] The fixing frame 13 is installed inside the brush handle 1, and the driving motor 7, the battery 14 and the circuit board are installed on the fixing frame 13 inside the brush handle 1, thereby being indirectly connected to the brush handle 1. A first elastic member 6 may be provided between the fixing frame 13 and the driving motor 7. The fixing frame 13 may not wrap the driving motor 7, but only connect part of the outer periphery of the driving motor 7, and the exposed outer periphery of the driving motor 7 may be supported by the brush handle 1.

[0036] The part of the brush handle 1 close to one axial end (close to the brush head 15) is provided with a driving motor 7, and one axial end of the driving motor 7 is connected to the brush head 15. The driving motor 7 and the brush head 15 are integrated, so that the brush head 15 will drive the driving motor 7 to shift when subjected to external force. The linkage member 8 is, for example, installed at the other end of the driving motor 7, and the linkage member 8 is installed on the fixing frame 13, for example, it is clamped at the corresponding position of the fixing frame 13, so that the linkage member 8 installs the other end of the driving motor 7 on the fixing frame 13 and then on the brush handle 1, and the linkage member 8 not only links with the driving motor 7 but also plays a connecting role. A second elastic member 11 can also be provided between the linkage member 8 and the fixing frame 13. When the linkage member 8 moves, the second elastic member 11 can be squeezed and deformed, thereby providing a larger activity space for the linkage member 8.

[0037] The brush handle 1 has a connection portion connected to one end of the driving motor 7. Specifically, the output shaft of the driving motor 7 passes through a hole at one end of the brush handle 1, and the connection portion is located at a portion of the brush handle 1 corresponding to the hole. The brush head 15 is driven by the output shaft of the driving motor 7 and is detachably connected to one axial end of the brush handle 1. For example, the brush head 15 is inserted into the output shaft. The hole of the brush handle 1 can be filled with a waterproof soft glue 9, which plays a waterproof role.

[0038] There is a gap S (e.g., about 2 mm) between the end faces of the brush head 15 and the brush handle 1 facing each other in the axial direction, and the existence of the gap S enables the brush head 15 to swing relative to the brush handle 1. A bottom cover 3 is provided at the other axial end of the brush handle 1, and the battery 14 is provided at a portion of the brush handle 1 near the other axial end. The battery 14 can be exposed by opening the bottom cover 3, so that the battery 14 can be manually disassembled and replaced.

[0039] A circuit board is also installed inside the brush handle 1. The circuit board is electrically connected to the battery 14 and the drive motor 7. The drive motor 7 is started and stopped or the rotation speed is changed under the control of the circuit board.

[0040] The part of the brush handle 1 corresponding to the circuit board may be provided with a button 2, and the part of the circuit board corresponding to the button 2 may be provided with a switch 4, and the switch 4 controls the driving motor 7. The button 2 can be pressed by an operator to manually control the start and stop of the electric toothbrush.

[0041] A first circuit board 5 and a second circuit board 12 electrically connected to each other may be provided on two opposite sides (front and back) of the electric toothbrush in the radial direction, and a button 2 may be provided on the side of the brush handle 1 corresponding to the first circuit board 5 .

[0042] The first circuit board 5 and the second circuit board 12 can be mounted on the fixing frame 13 . When buttons need to be provided on both opposite sides of the handle in the radial direction, switches corresponding to the newly provided buttons can be provided on the second circuit board 12 .

[0043] Combine the following Figures 2 to 3bA first embodiment of an electric toothbrush is described.

[0044] The light control device is arranged inside the brush handle 1, and the light control device includes an LED lamp bead 16 and a photoresistor 17. The LED lamp bead 16 and the photoresistor 17 are arranged relative to each other so that a light path can be formed therebetween. The photoresistor 17 generates an electrical signal after receiving the light emitted by the LED lamp bead 16. The LED lamp bead 16 and the photoresistor 17 are electrically connected to the circuit board so that they can be powered by the circuit board.

[0045] The LED lamp bead 16 can be directly connected to the first circuit board 5, and the photoresistor 17 can be directly connected to the second circuit board 12. In an embodiment with one circuit board, the LED lamp bead 16 and the photoresistor 17 can be connected to the same circuit board. In other embodiments, the positions of the LED lamp bead 16 and the photoresistor 17 can be interchanged.

[0046] The “front-rear direction of the brush head 15 ” mentioned below refers to the extending direction of the bristles. The side where the free ends of the bristles are located is called the front side of the brush head 15 , and the side where the base ends of the bristles are located is called the rear side of the brush head 15 .

[0047] The linkage member 8 includes a first portion located axially outside the drive motor 7 and a second portion that is externally mounted on the drive motor 7, wherein the second portion is cylindrical as a whole and has an inner cavity that accommodates a portion of the drive motor 7. The first portion of the linkage member 8 has a light channel 18. When the drive motor 7 stops, the light channel 18 can extend along the front-to-back direction of the brush head 15, and the LED lamp bead 16 and the photoresistor 17 are arranged relative to each other in the front-to-back direction of the brush head 15, so that the two ends of the light channel 18 are respectively aligned with the LED lamp bead 16 and the photoresistor 17, and the light emitted by the LED lamp bead 16 passes through the light channel 18 and is sensed by the photoresistor 17.

[0048] The linkage member 8, the drive motor 7 and the brush head 15 form an integral body, which constitutes a lever with the connection portion as a fulcrum, the brush head 15 and the portion of the drive motor 7 located on the brush head 15 side of the connection portion form a first force arm, and the linkage member 8 and the portion of the drive motor 7 located on the linkage member 8 side of the connection portion form a second force arm. The second elastic member 11 forms an elastic fulcrum supported on the fixing frame 13.

[0049] The light channel 18 and the brush head 15 are respectively located at two ends of the lever, so that the linkage effect between the light channel 18 and the brush head 15 is significant.

[0050] Preferably, the first force arm is smaller than the second force arm, which helps to further enhance the linkage effect between the light channel 18 and the brush head 15 , thereby ensuring the sensitivity of the photoresistor 17 .

[0051] like Figure 3a As shown, the drive motor 7 is in a stopped state, and the light channel 18 has a maximum light flux.

[0052] like Figure 3b As shown, L1 is the distance between the bristles and the elastic fulcrum Q, L2 is the distance between the fulcrum P and the elastic fulcrum Q, and L3 is the distance between the optical channel 18 and the elastic Q. The distance L1-L2 between the bristles and the fulcrum P is the length of the first lever arm, and the distance L2-L3 between the optical channel 18 and the fulcrum P is the length of the second lever arm.

[0053] The brush head 15 is subjected to force F, and at this time, it will move in the front-to-back direction ( Figure 3b In the vertical direction of the brush head 15, the brush head 15 is offset by a distance D. Specifically, the brush head 15 is moved toward the rear ( Figure 2 According to the lever principle, the drive motor 7 located on the opposite side of the fulcrum P from the brush head 15 will rotate in the opposite direction with the brush head 15, the linkage 8 moves with the drive motor 7, and the optical channel 18 is displaced (turned, such as Figure 3b The two ends of the light channel 18 are not aligned with the LED lamp bead 16 and the photoresistor 17 at the same time (shown by the middle dotted line). At the same time, the lever is subjected to the damping effect provided by the elastic fulcrum Q.

[0054] The circuit board presets a trigger value and an alarm value. The trigger value is the threshold for the electric toothbrush to enter a normal working mode, and the alarm value is the threshold for the electric toothbrush to enter an alarm mode.

[0055] When the user is not using the electric toothbrush, the brush head 15 does not enter the oral cavity, the brush head 15 is not subjected to force, and the photoresistor 17 senses the initial light flux. For example, in this embodiment, the light channel 18 has a maximum light flux, so the photoresistor 17 senses the maximum light flux, and the circuit board does not start the drive motor 7.

[0056] When the user uses the electric toothbrush, the brush head 15 enters the oral cavity and is biased backward by force. The brush head 15 drives the driving motor 7 to rotate around the fulcrum P, and the linkage 8 is linked to change the light flux between the LED lamp bead 16 and the photoresistor 17. For example, in this embodiment, the light channel 18 turns, and the light flux in the light channel 18 becomes smaller. When the light flux sensed by the photoresistor 17 reaches the trigger value, the circuit board controls the driving motor 7 to start according to the feedback of the photoresistor 17. In this way, the brush head 15 starts to vibrate only after entering the oral cavity and receiving force, so as to prevent the toothpaste from splashing due to vibration before entering the oral cavity.

[0057] When the user stops intermittently during use, the brush head 15 is not subjected to force, the linkage member 8 is linked, the light path returns to its original position, and the light flux sensed by the photoresistor 17 is restored, and the circuit board controls the drive motor 7 to stop.

[0058] When the user applies excessive force, the brush head 15 will deflect greatly under the greater force, and the linkage 8 will work together to make the luminous flux larger than that in the normal working mode. When the luminous flux sensed by the photoresistor 17 reaches the alarm value, the circuit board receives the feedback from the photoresistor 17 and controls the drive motor 7 to change the speed or stop, thereby prompting the user to apply excessive force.

[0059] It can be seen that the linkage member 8 is linked with the driving motor 7 to change the light flux between the LED lamp bead 16 and the photoresistor 17 . The photoresistor 17 senses the light flux, and the circuit board controls the driving motor 7 according to the signal fed back by the photoresistor 17 .

[0060] In this way, the electric toothbrush can be automatically controlled to be in multiple working modes, such as normal working mode, non-working mode and alarm mode. The electric toothbrush can be automatically controlled to vibrate only after entering the oral cavity and stop vibrating after leaving the oral cavity to prevent toothpaste from splashing. It can also standardize usage habits so that users can control the intensity of brushing teeth well. Moreover, the electric toothbrush is controlled based on the change of light signal rather than pressure signal. The change of light signal is easily sensed by the photoresistor 17, the electric toothbrush has a higher control sensitivity, and the manufacturing difficulty of the electric toothbrush is relatively low.

[0061] In addition, the linkage member 8 not only plays the above-mentioned connecting role, but also provides a light channel 18 to change the light flux, which simplifies the structure of the electric toothbrush.

[0062] In this embodiment, the LED lamp bead 16 is used as an example of a light source, and a photoresistor is used as an example of a light sensing element. The light source and the light sensing element may also be other.

[0063] Preferably, the light control device includes a light-beaming sleeve 10 made of an opaque material, which is placed outside the photoresistor 17 so that the photoresistor 17 only receives light emitted by the LED lamp bead 16 to prevent external light from interfering with the photoresistor 17's sensing of the light of the LED lamp bead 16 .

[0064] In a variation of this embodiment, when the drive motor 7 stops, the light channel 18 may not be aligned with the LED lamp bead 16 and the photoresistor 17 at the same time. When the drive motor 7 starts, the light channel 18 is displaced to change the luminous flux.

[0065] The present disclosure does not limit the initial position of the light channel 18 (the position when the drive motor 7 stops), as long as the light channel 18 can be displaced to change the light flux.

[0066] Figure 4 to Figure 5b The second embodiment of the electric toothbrush is shown. The difference between this embodiment and the first embodiment is mainly that the LED lamp bead 16 is replaced by a laser transmitter 16A, and the photoresistor 17 is replaced by a laser receiver 17A.

[0067] Combine the following Figure 6 to Figure 7b The third embodiment of the electric toothbrush is introduced. The third embodiment has the same principle as the first embodiment, but has a different structure. Only the difference between the two is introduced here.

[0068] The second part of the linkage 8 has a light channel. Specifically, the body of the second part has a light inlet 181 and a light outlet 182. When the drive motor 7 stops, the other end of the drive motor 7 is inserted into the inner cavity of the second part, thereby shielding a part of the inner cavity of the second part between the light inlet 181 and the light outlet 182. The light inlet 181, the light outlet 182, and the unshielded part of the inner cavity between the two form a light channel, which is, for example, annular or semi-annular.

[0069] like Figure 7a As shown, the driving motor 7 is in a stopped state, and the light inlet 181 of the linkage member 8 is blocked by the rear end of the driving motor 7 .

[0070] like Figure 7b As shown, the brush head 15 is acted upon by force F, and at this time, the brush head 15 moves in the front-to-back direction (such as Figure 7b In the vertical direction of the brush head 15, the brush head 15 is offset by a distance D. Specifically, the brush head 15 is moved toward the rear ( Figure 6 According to the lever principle, the drive motor 7 will rotate in the opposite direction with the brush head 15, and the linkage member 8 will rotate with the drive motor 7, but the drive motor 7 and the linkage member 8 have different rotation angles, resulting in a gap between the two. The light channel changes, and the light emitted by the LED lamp bead 16 is diffracted from the gap. The diffracted light L enters the light channel through the light inlet 181 and is sensed by the photoresistor 17.

[0071] When the user does not use the electric toothbrush, the brush head 15 does not enter the oral cavity, the brush head 15 is not subjected to force, the photoresistor 17 senses the initial light flux, and the circuit board does not start the drive motor 7.

[0072] When the user uses the electric toothbrush, the brush head 15 enters the oral cavity and is forced to deflect backwards, the brush head 15 drives the drive motor 7 to rotate, the linkage 8 rotates to form a gap between the linkage 8 and the drive motor 7, the light channel changes to open, and the photoresistor 17 senses the change in light quantity, and the circuit board controls the drive motor 7 to start according to the feedback of the photoresistor 17.

[0073] When the user stops intermittently during use, the brush head 15 is not subjected to force, the linkage member 8 is linked and returns to its original position, the light channel returns to its initial state, the photoresistor 17 senses the initial light flux again, and the circuit board controls the drive motor 7 to stop.

[0074] When the user applies excessive force, the brush head 15 deflects greatly under the greater force, and the linkage part 8 operates to enlarge the gap. The amount of light diffracted from the light inlet 181 increases. When the amount of light sensed by the photoresistor 17 reaches the alarm value, the circuit board receives feedback from the photoresistor 17 and controls the drive motor 7 to change the frequency or stop, thereby prompting the user to apply excessive force.

[0075] In a variation of this embodiment, when the drive motor 7 stops, the light channel may be partially blocked, and when the drive motor 7 starts, a gap is formed between the drive motor 7 and the linkage 8 due to rotation, and the light channel is opened.

[0076] The present disclosure does not limit the initial state of the light channel (the state of being blocked when the drive motor 7 stops), as long as the light channel can be further opened or blocked when the linkage member 8 is linked so that the amount of light passing therethrough changes.

[0077] In this embodiment, the combination of the light source and the light sensing element may also be a combination of a laser transmitter 16A and a laser receiver 17A.

[0078] In other embodiments, the electric toothbrush may further include an indicator light, and when the user exerts too much force, the circuit board may control the indicator light to flash to remind the user. Alternatively, in other embodiments, the electric toothbrush may further include an alarm, and when the user exerts too much force, the circuit board may control the alarm to sound an alarm to remind the user.

[0079] For the electric toothbrush provided in the present disclosure, the working mode can be automatically controlled by a light control device, and the start and stop can also be achieved by manually operating the button 2.

[0080] It should be understood that the “displacement” of the drive motor 7 refers to a slight swing of the drive motor 7 , for example, a swing of the portion thereof located in the hole at one end of the brush handle 1 , rather than the entire movement of the drive motor 7 .

[0081] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present disclosure. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present disclosure without departing from the scope of the present disclosure.

Claims

1. An electric toothbrush with a light control device, characterized in that: The brush head (15) comprises a brush head (15), a motor assembly and a circuit board, wherein the motor assembly comprises a drive motor (7), the drive motor (7) drives the brush head (15) and is electrically connected to the circuit board, and the brush head (15) drives the drive motor (7) to shift when subjected to an external force. The light control device comprises a light source and a light sensing element, the motor assembly further comprises a linkage member (8), the linkage member (8) is linked with the drive motor (7) and changes the light flux between the light source and the light sensing element under the drive of the drive motor (7), the light source and the light sensing element are electrically connected to the circuit board, and the circuit board controls the drive motor (7) according to a signal fed back by the light sensing element, The handle (1) of the electric toothbrush has a connection portion connected to one end of the drive motor (7); the linkage member (8) has a light channel (18) for light emitted by the light source to pass through; when the linkage member (8) moves with the drive motor (7), the light channel (18) is displaced or blocked or opened so that the light flux changes; the linkage member (8), the drive motor (7) and the brush head (15) form a whole that constitutes a lever with the connection portion as a fulcrum; the brush head (15) and the drive motor (7) are located on the brush head (15) side of the connection portion to form a first force arm; the linkage member (8) and the drive motor (7) are located on the linkage member (8) side of the connection portion to form a second force arm; the first force arm is smaller than the second force arm; When the brush head (15) is not subjected to force, the circuit board does not start the drive motor (7) according to feedback from the optical sensor element; When the brush head (15) is subjected to force, the lever rotates, the light channel (18) turns, and the light flux in the light channel (18) changes. When the light flux sensed by the light sensing element reaches a trigger value preset by the circuit board, the circuit board controls the drive motor (7) to start according to the feedback of the light sensing element; and When the light flux sensed by the optical sensor element reaches the alarm value preset by the circuit board, the circuit board controls the drive motor (7) to change the speed or stop according to the feedback of the optical sensor element, and / or controls the indicator light to flash, and / or controls the alarm to sound an alarm. The light source and the light sensing element are arranged opposite to each other in the front-to-back direction of the brush head (15), and the light channel (18) extends along the front-to-back direction of the brush head (15). The front-to-back direction of the brush head (15) is the extension direction of the bristles. The side where the free ends of the bristles are located is the front side of the brush head (15), and the side where the base ends of the bristles are located is the rear side of the brush head (15).

2. The electric toothbrush with a light control device according to claim 1, characterized in that: One end of the drive motor (7) is connected to the brush head (15), and the other end of the drive motor (7) is connected to the linkage member (8), and the linkage member (8) mounts the other end of the drive motor (7) on the handle (1) of the electric toothbrush.

3. The electric toothbrush with a light control device according to claim 1, characterized in that: The brush head (15) has bristles, and the brush head (15) is located at one end of the lever, and the distance between the bristles and the connecting part is smaller than the distance between the light channel (18) and the connecting part.

4. The electric toothbrush with a light control device according to claim 2, characterized in that: The linkage member (8) comprises a first part located axially outside the drive motor (7) and a second part externally mounted on the drive motor (7), the first part having the light channel (18), and when the drive motor (7) stops and the linkage member (8) moves with the drive motor (7), the light channel (18) is displaced to change the light flux.

5. The electric toothbrush with a light control device according to claim 2, characterized in that: The linkage member (8) comprises a first portion located axially outside the drive motor (7) and a second portion disposed outside the drive motor (7), wherein the second portion is cylindrical and has the light channel (18). When the drive motor (7) stops, the light channel (18) is blocked by the drive motor (7); when the linkage member (8) moves with the drive motor (7), the light channel (18) is opened.

6. The electric toothbrush with a light control device according to claim 1, characterized in that: The light source includes an LED lamp bead (16), and the light sensing element includes a photoresistor (17); or, The light source comprises a laser transmitter (16A), and the light sensing element comprises a laser receiver (17A).

7. The electric toothbrush with a light control device according to claim 1, characterized in that: The light control device comprises a light beam sleeve (10), the light beam sleeve (10) is made of a light-proof material, and the light beam sleeve (10) is placed outside the light sensing element, so that the light sensing element only receives light from the light source.

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