Electric toothbrush

Abstract

The embodiment of the utility model provides an electric toothbrush. The electric toothbrush comprises a handle shell, a machine core and a bottom cover. The handle shell is provided with a mounting cavity, and the bottom end of the handle shell is provided with a mounting opening communicating with the mounting cavity. The movement is installed in the installation cavity and comprises a support and a circuit board, the support is fixed to the handle shell, and the circuit board is installed on the support and extends in the length direction of the handle shell; the bottom cover is connected with the handle shell and / or the support and covers the mounting opening, the bottom cover is provided with a containing cavity communicated with the mounting cavity, and the circuit board partially extends into the containing cavity. The circuit board partially extends into the accommodating cavity, so that the length of the handle shell can be shorter, and the overall length of the electric toothbrush can be further shortened.

Description

Technical Field

[0001] The present application relates to the technical field of oral cleaning, and in particular to an electric toothbrush. Background Art

[0002] The handle shell of an electric toothbrush is usually cylindrical, and a long strip-shaped bracket and a battery and a motor are arranged on the bracket in sequence along the length direction of the handle shell. In order to realize the control of the electric toothbrush, such as brushing control, charging control, and detection control, a circuit board electrically connected to the battery and the motor needs to be provided. The circuit board is usually set in the shape of a long plate, and the reasons are: first, since the circuit board needs to be installed in the cylindrical handle shell, the installation space is limited, and in order to have enough area to arrange the required electronic devices and realize the corresponding control functions, the circuit board can only be set in the shape of a long plate; second, the circuit board is set in the shape of a long plate, which is consistent with the extension direction of the bracket, which is conducive to shortening the connection line between the circuit board and the motor and the battery.

[0003] As the intelligence of electric toothbrushes continues to improve, more and more sensors and detection circuits are installed on the circuit board, which also requires a larger circuit board area. In order to ensure the grip feel, the handle shell should not be made too thick, so the length of the circuit board will be correspondingly longer, which will also cause the handle shell to be longer, and then the overall length of the electric toothbrush to be longer. Therefore, how to shorten the overall length of the electric toothbrush while ensuring the control function of the electric toothbrush has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application provides an electric toothbrush. Since the circuit board partially extends into the accommodating cavity, the length of the handle shell can be made shorter, thereby shortening the overall length of the electric toothbrush.

[0005] The present application provides an electric toothbrush, comprising:

[0006] A handle shell having a mounting cavity, and a bottom end of the handle shell having a mounting opening communicating with the mounting cavity;

[0007] A movement, installed in the installation cavity, the movement comprising a bracket and a circuit board, the bracket being fixed to the handle shell, the circuit board being installed on the bracket and extending along the length direction of the handle shell;

[0008] A bottom cover is connected to the handle shell and / or the bracket and covers the installation opening. The bottom cover has a receiving cavity communicated with the installation cavity, and the circuit board partially extends into the receiving cavity.

[0009] Optionally, the movement further includes a battery electrically connected to the circuit board, and the bracket includes:

[0010] A battery compartment shell, wherein the battery is installed in the battery compartment shell, and the bottom of the battery compartment is opposite to the bottom cover and is spaced apart from each other;

[0011] Wherein, the circuit board is mounted on the outer surface of the battery compartment shell and extends toward the bottom cover along the length direction beyond the bottom end of the battery compartment shell.

[0012] Optionally, the support further comprises:

[0013] A support plate extends from the bottom end of the battery compartment shell toward the bottom cover to support the circuit board.

[0014] Optionally, the movement further includes a motor and a display component electrically connected to the circuit board, and the bracket further includes:

[0015] A motor housing shell connected to an end of the battery housing shell away from the bottom cover along the length direction of the handle shell, and the motor is installed in the motor housing shell;

[0016] Wherein, the display component is arranged on the outer surface of the motor housing, and the display component and the circuit board are located on the same side of the bracket, and the circuit board extends to the outer surface of the motor housing.

[0017] Optionally, the handle shell has a center plane that bisects the handle shell along the front-to-back direction, and the bracket has a front side surface and a rear side surface that are arranged opposite to each other along the front-to-back direction, the front side surface of the bracket is closer to the center plane than the rear side surface, and the circuit board is installed on the front side surface;

[0018] Wherein, the handle shell includes a button, and the front side surface is arranged toward the button.

[0019] Optionally, the movement further comprises a motor disposed on the bracket, and an output shaft of the motor is located between the center dividing surface and the rear side surface.

[0020] Optionally, the circuit board includes:

[0021] An extending section, located in the accommodating cavity;

[0022] The external section is located outside the accommodating cavity and inside the mounting cavity. Along the width direction perpendicular to the length direction of the handle shell, the width of the external section is greater than the width of the extending section.

[0023] Optionally, the handle shell comprises:

[0024] Metal housing,

[0025] The plastic lining is fixed to the inner wall of the metal shell, and the plastic lining is molded with a connecting structure, and the bracket is connected to the connecting structure so that the movement is fixed in the handle shell.

[0026] Optionally, the bottom cover comprises:

[0027] A bottom plate, used for covering the installation opening;

[0028] The cylindrical portion is arranged in a cylindrical shape on the surface of the bottom plate facing the installation cavity and has the accommodating cavity. An insertion port is configured at one end of the cylindrical portion away from the bottom plate so that the circuit board can extend into the accommodating cavity through the insertion port.

[0029] The plastic liner is cylindrical and includes a connecting section close to the bottom plate, the cylindrical portion passes through the connecting section and is sealed to the connecting end, and the thickness of the connecting section is smaller than the thickness of other parts of the plastic liner.

[0030] Optionally, the bottom end of the plastic liner is retracted into the installation cavity relative to the bottom end of the metal shell, so that a first step structure is formed between the bottom end of the plastic liner and the bottom end of the metal shell;

[0031] The bottom plate includes an annular protrusion protruding relative to the cylindrical portion, so that a second step structure is formed between the annular protrusion and the cylindrical portion, and the second step structure cooperates with the first step structure so that the bottom plate is at least partially located in the metal shell.

[0032] Optionally, the bottom cover comprises:

[0033] A bottom plate, used for covering the installation opening;

[0034] The cylindrical portion is arranged in a cylindrical shape on the surface of the base plate facing the installation cavity, and together with the base plate, forms the accommodating cavity. An insertion port is configured at the end of the cylindrical portion away from the base plate, so that the circuit board can extend into the accommodating cavity through the insertion port, and the outer wall of the cylindrical portion is sealed and connected to the inner wall of the handle shell.

[0035] Optionally, the bottom cover further includes a first fastener, which extends from at least one of the bottom plate and the cylindrical portion toward the bracket; the movement further includes a battery electrically connected to the circuit board, and the bracket includes:

[0036] A battery compartment shell, wherein the battery is installed in the battery compartment shell, and the bottom of the battery compartment shell is arranged opposite to the bottom plate; and

[0037] The second fastener extends from the bottom of the battery compartment shell toward the bottom plate, and the second fastener is fastened to the first fastener.

[0038] Optionally, the buckle group formed by the first buckle member and the second buckle member includes two groups, the two buckle groups are opposite and spaced apart, and the portion of the circuit board extending into the accommodating cavity is located on one side of the whole formed by the two buckle groups and spaced apart from the buckle groups.

[0039] Optionally, the outer wall of the cylindrical portion has a glue filling groove arranged in an annular shape, the glue filling groove is filled with glue, and the glue is bonded to the inner wall of the handle shell; and / or,

[0040] The outer wall of the cylindrical portion has an annular groove arranged in an annular shape, a sealing ring is arranged in the annular groove, and the sealing ring is interference-fitted with the inner wall of the handle shell.

[0041] Optionally, the outer side wall of the cylindrical portion has both the glue filling groove and the annular groove, and along the length direction of the handle shell, the annular groove is located between the bottom plate and the glue filling groove.

[0042] Optionally, it also includes:

[0043] The charging component is arranged on the handle shell, penetrates the handle shell and is electrically connected to the circuit board.

[0044] The electric toothbrush provided in the embodiment of the present application has a bottom cover with a accommodating cavity connected to the mounting cavity, and the circuit board partially extends into the accommodating cavity. In this way, the length of the circuit board can be increased while the length of the handle shell remains unchanged, that is, the overall length of the electric toothbrush remains unchanged, thereby increasing the length of the circuit board and increasing the area of ​​the circuit board. More electronic components can be arranged on the circuit board to realize more control functions. In other words, on the basis of having the same control function, since the circuit board partially extends into the accommodating cavity, the length of the handle shell can be made shorter, thereby shortening the overall length of the electric toothbrush. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 This is a schematic diagram of the structure of an electric toothbrush in an embodiment of the present application;

[0047] Figure 2 for Figure 1The schematic diagram of the exploded structure of the electric toothbrush shown;

[0048] Figure 3 for Figure 1 A schematic diagram of the exploded structure of the electric toothbrush from another perspective;

[0049] Figure 4 for Figure 1 An exploded structural diagram of a portion of the structure of an electric toothbrush shown;

[0050] Figure 5 for Figure 1 The schematic diagram of the exploded structure of the movement and bottom cover of the electric toothbrush shown;

[0051] Figure 6 for Figure 1 The schematic diagram of the structure of the electric toothbrush shown is after the brush head is removed;

[0052] Figure 7 for Figure 6 A cross-sectional view of the electric toothbrush along the BB section;

[0053] Figure 8 for Figure 7 The enlarged structural diagram of the middle C part;

[0054] Fig. 9 for Figure 1 A schematic diagram of the exploded structure of a partial structure of the electric toothbrush shown in another perspective;

[0055] Fig.10 for Figure 1 The schematic diagram of the structure of the bottom cover of the electric toothbrush shown.

[0056] Description of Figure Numbers:

[0057] 100 electric toothbrush; 10-handle shell; 10a-installation cavity; 10b-installation opening; 11-metal shell; 12-plastic lining; 121-connecting section; 122-fixing section; 123-connecting structure; 13-first step structure;

[0058] 20- movement; 21- bracket; 21a- front side; 21b- rear side; 211- battery compartment shell; 2111- bottom end of battery compartment shell; 212- motor compartment shell; 213- support plate; 214- second buckle; 22- battery; 23- motor; 231- output shaft; 24- circuit board; 241- insertion section; 242- external section; 25 display member;

[0059] 30-bottom cover; 30a-accommodating cavity; 30b-insertion port; 31-bottom plate; 311-annular convex portion; 32-cylindrical portion; 32a-glue filling groove; 32b-annular groove; 33-second step structure; 34-sealing ring; 35-first buckle;

[0060] 40-brush heads; 50 charging parts. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0062] See also Figure 1-3 The present invention discloses an electric toothbrush 100 for cleaning a user's oral cavity. The electric toothbrush 100 includes a handle shell 10, a movement 20 disposed in the handle shell 10, a bottom cover 30 disposed at the bottom end of the handle shell 10, and a brush head 40 located outside the handle shell 10 and driven by the movement 20.

[0063] See also Figure 2-4 The handle shell 10 is an appearance component of the electric toothbrush 100 and is suitable for being held by the user to facilitate the user to use the electric toothbrush 100. Specifically, the handle shell 10 has a mounting cavity 10a, and the bottom end of the handle shell 10 has a mounting opening 10b connected to the mounting cavity 10a. The core 20 can be installed in the mounting cavity 10a of the handle shell 10 through the mounting opening 10b. Therefore, the handle shell 10 can also protect the core 20 installed therein.

[0064] See also Figure 2-3 as well as Figure 5 The movement 20 is used as a power component to realize the brushing function of the electric toothbrush 100. The movement 20 may include a bracket 21, a battery 22, a motor 23, a circuit board 24 and other components.

[0065] The bracket 21 is fixedly connected to the inner wall of the handle shell 10 and is used to support components such as a battery 22 , a motor 23 and a circuit board 24 .

[0066] The battery 22 is used to supply power to the motor 23 and the circuit board 24. The battery 22 may be a rechargeable battery 22. When the battery 22 runs out of power, the battery 22 may be charged by an external power source under the control of the circuit board 24, thereby achieving sustainable use of the electric toothbrush 100.

[0067] The output shaft 231 of the motor 23 passes through the handle shell 10 and is connected to the brush head 40. Under the control of the circuit board 24, the high-frequency vibration energy of the motor 23 when working is transmitted to the brush head 4020 through the output shaft 231. When the brush head 4020 acts on the user's mouth, the cleaning function of the user's mouth can be realized.

[0068] See also Figure 2-3 as well as Figure 5 For example, the motor 23 and the battery 22 can be arranged along the length direction AA of the handle shell 10, and along the length direction AA of the handle shell 10, the motor 23 is arranged closer to the brush head 40 than the battery 22, that is, along the length direction AA of the handle shell 10, after the brush head 40 is installed on the output shaft 231 of the motor 23, the main part of the motor 23 (the parts of the motor 23 except the output shaft 231) is located between the brush head 40 and the battery 22. At this time, the axial direction of the motor 23 is parallel to the axial direction of the battery 22, and both are parallel to the length direction AA of the handle shell 10, and the end of the motor 23 away from the brush head 40 is arranged opposite to the end of the battery 22 close to the brush head 40.

[0069] In this way, on the one hand, the motor 23 is closer to the brush head 40 than the battery 22, which is convenient for connecting with the brush head 40; on the other hand, the motor 23 and the battery 22 are coaxially arranged along the length direction AA of the handle shell 10. Compared with other arrangements, the radial dimension of the installation cavity 10a can be reduced, and the radial dimension of the handle shell 10 can also be reduced, so that the handle shell 10 is in the shape of a long cylinder. In this way, the motor 23 and the battery 22 are compactly installed in the installation cavity 10a, and the handle shell 10 has sufficient length and a smaller radial direction for the user to hold stably.

[0070] The circuit board 24 is electrically connected to the battery 22, the motor 23 and other electronic devices, and is used to control each electronic device to realize the required control functions of the electric toothbrush 100. The required functions of the electric toothbrush 100 include, but are not limited to, the charging and discharging function of the battery 22, the adjustment function of the brushing mode, the detection function of the brushing parameters during the brushing process, the communication function with the external terminal and the display function, etc., which are not exhaustively listed here.

[0071] For example, the electric toothbrush 100 has a charging and discharging function for the battery 22, and the circuit board 24 can control the battery 22 to discharge so that the battery 22 can supply power to the circuit board 24 and the motor 23 and other electronic devices. Figure 2 As shown, the electric toothbrush 100 may further include a charging component 50 , and the circuit board 24 is electrically connected to the charging component 50 . When the charging component 50 is connected to an external power source, the circuit board 24 charges the battery 22 through the charging component 50 .

[0072] For another example, the electric toothbrush 100 has a function of adjusting the brushing mode, and the circuit board 24 can control at least one of the vibration frequency and the vibration amplitude of the motor 23 to control the electric toothbrush 100 to work in different brushing modes. The brushing modes can exemplarily include a gentle mode, a moderate mode, and a strong mode, and at least one of the vibration frequency and the vibration amplitude corresponding to the gentle mode, the moderate mode, and the strong mode increases in sequence.

[0073] For another example, the electric toothbrush 100 has a function of detecting brushing parameters during the brushing process. For example, the electric toothbrush 100 may have an overpressure detection function. The electric toothbrush 100 may further include a pressure sensor (not shown in the figure) and an overpressure reminder component (the overpressure reminder component may be, for example, Figure 2-3 as well as Figure 5 The display element 25 shown, the pressure sensor and the over-pressure reminder component are all electrically connected to the circuit board 24. The over-pressure sensor is used to detect the force exerted by the teeth on the brush head 40 during brushing. When the force is greater than the preset pressure, the circuit board 24 controls the over-pressure reminder component to give a corresponding prompt to remind the user that the brushing force is too strong at this time.

[0074] For another example, the electric toothbrush 100 has a communication function with an external terminal. The electric toothbrush 100 may further include a wireless communication module (not shown in the figure) such as a Bluetooth module or a Fi-Wi module, or a wired communication module (not shown in the figure) such as a Type-C interface, etc. The circuit board 24 controls the wireless communication module or the wired communication module to communicate with the external terminal.

[0075] For another example, the electric toothbrush 100 has a display function, and the electric toothbrush 100 may further include a display component 25, which may include a display screen or lamp beads. The circuit board 24 controls the display screen or the lamp beads to achieve corresponding display functions, such as displaying overvoltage warning information.

[0076] In summary, when the electric toothbrush 100 is required to have one or more of the above functions, a large number of electronic devices need to be configured on the circuit board 24 to realize the corresponding control functions. However, the circuit board 24 needs to be set in the mounting cavity 10a. Therefore, the area of ​​the circuit board 24 where electronic devices can be set is limited by the size of the mounting cavity 10a. Specifically, the length of the circuit board 24 is limited by the length of the mounting cavity 10a, and the width of the circuit board 24 is limited by the diameter of the mounting cavity 10a. In order to avoid components such as the bracket 21, the battery 22 and the motor 23, when the mounting cavity 10a is cylindrical, the circuit board 24 cannot be located on the maximum mounting surface of the mounting cavity 10a, so that the width of the circuit board 24 is further limited.

[0077] See also Figure 4-5In order to solve the problem of limited area of ​​the circuit board 24, the circuit board 24 can extend along the length direction AA of the handle shell 10, so that the circuit board 24 is in the shape of a long plate, that is, by increasing the length of the circuit board 24, the area on which electronic devices can be arranged can be expanded. However, simply increasing the length of the circuit board 24 will inevitably increase the length of the handle shell 10, resulting in a longer overall length of the electric toothbrush 100. Even after the user holds the handle shell 10, a long section of the bottom of the handle shell 10 still extends out of the user's hand, which is inconvenient for the user to use and carry the electric toothbrush 100.

[0078] Therefore, how to shorten the overall length of the electric toothbrush 100 while ensuring the control functions that the electric toothbrush 100 should have has become a technical problem to be solved in this embodiment. In order to solve this technical problem, in this embodiment, by providing a bottom cover 30, the bottom cover 30 is fixedly connected to at least one of the handle shell 10 and the bracket 21, so that the bottom cover 30 is stably installed on at least one of the handle shell 10 and the bracket 21, and the bottom cover 30 covers the installation opening 10b of the installation cavity 10a. On the one hand, it prevents the movement 20 from falling out of the installation opening 10b. On the other hand, the bottom cover 30 can seal the installation opening 10b to prevent liquid or water vapor from entering the installation cavity 10a and affecting the electronic devices on the circuit board 24.

[0079] See also Figure 5-8 More importantly, the bottom cover 30 has a accommodating cavity 30a connected to the mounting cavity 10a, and the circuit board 24 partially extends into the accommodating cavity 30a. In this way, the length of the circuit board 24 can be increased, and the area of ​​the circuit board 24 can be increased, and more electronic devices can be arranged on the circuit board 24 to realize more control functions. In other words, on the basis of having the same control function, since the circuit board 24 partially extends into the accommodating cavity 30a, the length of the handle shell 10 can be made shorter, and the overall length of the electric toothbrush 100 can be shortened.

[0080] See also Figure 5 as well as Figure 8-9In some embodiments, the bracket 21 includes a battery compartment shell 211, and the battery 22 is installed in the battery compartment shell 211, that is, the battery compartment shell 211 is used to install the battery 22. The bottom of the battery compartment 22 is opposite to the bottom cover 30 and is spaced apart, and the bottom of the battery compartment shell 211 is the end of the battery compartment shell 211 away from the motor 23. The circuit board 24 is at least installed on the outer surface of the battery compartment shell 211. It can also be understood that the circuit board 24 is overlapped with the battery compartment shell 211 along a certain radial direction of the handle shell 10, such as the front-to-back direction of the handle shell 10, and along the length direction AA of the handle shell 10, the circuit board 24 extends toward the bottom cover 30 beyond the bottom end 2111 of the battery compartment shell 211. In this way, the circuit board 24 can extend into the accommodating cavity 30a, and then the area of ​​the circuit board 24 is increased by increasing the length of the circuit board 24. On this basis, since the bottom of the battery compartment shell 211 is opposite to the bottom cover 30 and is spaced apart, in the process of the bottom cover 30 sealing the installation opening 10b, that is, in the process of the circuit board 24 extending into the accommodating cavity 30a, the battery compartment shell 211 can be prevented from interfering with the installation of the bottom cover 30, thereby preventing the bottom cover 30 from being unable to be installed normally.

[0081] See also Figure 8 as well as Fig. 9 Furthermore, along the length direction AA of the handle shell 10, the portion of the circuit board 24 extending toward the bottom cover 30 beyond the bottom end 2111 of the battery compartment shell 211 is in a suspended state. In order to further improve the installation stability of the suspended portion, the bracket 21 further includes a support plate 213, which extends from the bottom end 2111 of the battery compartment shell 211 toward the bottom cover 30 to support the circuit board 24. That is, the support plate 213 is used to support the suspended portion of the circuit board 24 beyond the bottom end 2111 of the battery compartment shell 211, so as to avoid the suspended portion of the circuit board 24 being too long and easy to break, especially when a large number of electronic devices are also arranged on the surface of the suspended portion, the suspended portion will be easy to break due to carrying a large weight. Therefore, by supporting the suspended portion with the support plate 213, not only the installation stability of the suspended portion on the bracket 21 can be improved, but also the service life of the circuit board 24 can be improved.

[0082] See also Figure 5 or Fig. 9 Furthermore, the bracket 21 also includes a motor housing shell 212, and the motor housing shell 212 is connected to the end of the battery housing shell 211 away from the bottom cover 30 along the length direction AA of the handle shell 10, that is, along the length direction AA of the handle shell 10, the battery housing shell 211 is located between the bottom cover 30 and the motor housing shell 212, and the motor 23 is installed in the motor housing shell 212. In this way, by designing the motor housing shell 212 to be closer to the brush head 40 relative to the battery housing shell 211, after the motor 23 is installed in the motor housing shell 212, the distance between the motor 23 and the brush head 40 is shortened, which facilitates the connection between the motor 23 and the brush head 40.

[0083] Among them, the display member 25 is arranged on the outer surface of the motor housing 212, that is, the display member 25 is overlapped with the motor housing 212 along a certain radial direction of the handle shell 10, such as the front-to-back direction of the handle shell 10, and the display member 25 and the circuit board 24 are located on the same side of the bracket 21, so that the circuit board 24 and the display member 25 are installed corresponding to the battery housing 211 and the motor housing 212 respectively, and the installation of the circuit board 24 and the display member 25 on the bracket 21 is more compact, which is conducive to reducing the size of the movement 20. Furthermore, along the length direction AA of the handle shell 10, the circuit board 24 extends to the outer surface of the motor housing 212, so that the length of the circuit board 24 can be further increased, and the area of ​​the circuit board 24 can be further increased under the premise that the length of the handle shell 10 remains unchanged. In other words, under the condition that the overall length of the circuit board 24 remains unchanged, since the circuit board 24 extends to the outer surface of the motor housing 212, rather than extending to the outside of the bottom cover 30, the length of the handle shell 10 can be shortened.

[0084] See also Figure 7 In some embodiments, the handle shell 10 includes a button 13, and the button 13 is connected to the circuit board 24. The user can trigger the corresponding control instruction by operating the button 13 and send it to the circuit board 24, so that the circuit board 24 controls other electronic devices to achieve the corresponding control function. For example, the brushing mode adjustment function can be achieved by operating the button 13. When the button 13 is operated, the circuit board 24 can control at least one of the vibration frequency and vibration amplitude of the motor 23 according to the control instruction issued by the button 13, so as to control the electric toothbrush 100 to work in different brushing modes.

[0085] Please also read Figure 7 as well as Fig. 9Furthermore, the handle shell 10 has a center dividing surface that bisects the handle shell 10 along the front-to-back direction. Along the front-to-back direction, the bracket 21 has a front side surface 21a and a rear side surface 21b that are arranged opposite to each other. The front side surface 21a of the bracket 21 is arranged toward the button 13, that is, the surface of the bracket 21 facing the button 13 is the front side surface 21a, and the circuit board 24 is installed on the front side surface 21a of the bracket 21; the surface of the bracket 21 facing away from the button 13 is the rear side surface 21b. The front side surface 21a of the bracket 21 is closer to the center dividing surface of the handle shell 10 than the rear side surface 21b, so that the circuit board 24 is closer to the center dividing surface of the handle shell 10 Exemplarily, the mounting cavity 10a is cylindrical. Therefore, in the front-to-back direction, the position of the center plane of the handle shell 10 is actually the maximum mounting surface in the mounting cavity 10a. The circuit board 24 is closer to the center plane of the handle shell 10, that is, closer to the maximum mounting surface of the mounting cavity 10a. Therefore, the circuit board 24 can have a larger width. When the number of electronic components installed on the circuit board 24 is fixed, more electronic components can be installed along the width direction DD of the circuit board 24. Therefore, the length of the circuit board 24 can be shortened, and then the length of the handle shell 10 and the electric toothbrush 100 can be shortened.

[0086] Please continue reading Figure 7 Furthermore, the output shaft 231 of the motor 23 is located between the center plane and the rear side surface 21b, that is, the motor housing 212 and the motor 23 are eccentrically arranged relative to the handle housing 10, and the motor housing 212 and the motor 23 are closer to the rear side of the handle housing 10 in the front-to-back direction of the handle housing 10. When the battery 22 and the motor 23 are coaxially installed, the battery housing 211 and the battery 22 are also arranged closer to the rear side of the handle housing 10, so that the circuit board 24 on the surface of the motor housing 212 and the battery housing 211 can be arranged closer to the center plane of the handle housing 10, that is, closer to the maximum installation surface of the installation cavity 10a, so that the circuit board 24 can have a larger width, which is more conducive to shortening the length of the circuit board 24, and thus shortening the length of the handle housing 10 and the electric toothbrush 100.

[0087] See also Figure 8-9 In some embodiments, the circuit board 24 includes an extending section 241 and an external section 242 connected along the length direction AA. The extending section 241 extends into the accommodating cavity 30a and is a section of the circuit board 24 that extends into the accommodating cavity 30a. The external section 242 is located outside the accommodating cavity 30a and inside the installation cavity 10a, and is a portion of the circuit board 24 that does not extend into the accommodating cavity 30a. Along the width direction DD perpendicular to the length direction AA of the handle shell 10, the width of the external section 242 is greater than the width of the extending section 241.

[0088] That is, the width of the insertion section 241 is smaller, and the width of the external section 242 is larger. In this way, when the bottom cover 30 is used to cover the installation opening 10b, the insertion section 241 can be more easily inserted into the accommodating cavity 30a, and will not hit the bottom cover 30, causing the bottom cover 30 to be unable to be installed smoothly. After the bottom cover 30 is installed, the insertion section 241 and the cavity wall of the accommodating cavity 30a can also be spaced apart to prevent the vibration of the movement 20 from being transmitted to the bottom cover 30 through the circuit board 24 when the motor 23 is working, thereby reducing the risk of the bottom cover 30 being loosened from the handle shell 10 due to vibration. Furthermore, the width of the external section 242 is larger, and more electronic components can be installed along the width direction DD of the circuit board 24. Therefore, the length of the circuit board 24 can be shortened, and then the length of the handle shell 10 and the electric toothbrush 100 can be shortened.

[0089] See also Figure 2-3 In some embodiments, the handle shell 10 includes a metal shell 11. The metal shell 11 not only makes the electric toothbrush 100 as a whole have better structural strength and better antibacterial and mildew-proof properties, but also it should be particularly noted that common metal machining processes include stretching and extrusion molding, and the metal shell 11 is formed by the above processes. Compared with the plastic shell that can be molded by the injection molding process, the metal shell 11 has greater processing difficulty. In the above embodiments of the present application, by allowing the circuit board 24 to extend into the accommodating cavity 30a of the bottom cover 30, the length of the handle shell 10 can be shortened. Therefore, the length of the metal shell 11 can also be shortened. The shorter metal shell 11 is easier to process and mold. Compared with the injection molding process of the plastic shell, there is no need to pay attention to the length of the handle shell 10. The shorter metal shell 11 can significantly reduce the processing difficulty and processing cost.

[0090] Please continue reading Figure 2-3 Furthermore, the handle shell 10 further includes a plastic lining 12, which is fixed to the inner wall of the metal shell 11, and the plastic lining 12 is formed with a connecting structure 123 (see Figure 3 as well as Figure 4 ), the bracket 21 is connected to the connecting structure 123, so that the movement 20 is fixed in the handle shell 10. Since the metal shell 11 is formed by stretching or extrusion, it is difficult to form a connecting structure 123 connected to the bracket 21 directly on the inner wall of the metal shell 11. If the connecting structure 123 is formed first and then welded to the inner wall of the metal shell 11, it is not convenient to weld due to the small space in the installation cavity 10a. Relatively speaking, since the plastic lining 12 is a plastic part, it is convenient to form the connecting structure 123 connected to the bracket 21 through the injection molding process, and connect it to the bracket 21 through the connecting structure 123, so as to realize the fixed installation of the movement 20 in the handle shell 10. In addition, the shorter metal shell 11 and plastic lining 12 can achieve a more stable installation with the movement 20.

[0091] See also Figure 9-10 In some embodiments, the bottom cover 30 includes a bottom plate 31 and a cylindrical portion 32. The bottom plate 31 is plate-shaped and is used to cover the installation opening 10b. The cylindrical portion 32 is cylindrical and is arranged on the surface of the bottom plate 31 facing the installation cavity 10a, and has a accommodating cavity 30a. The end of the cylindrical portion 32 facing away from the bottom plate 31 is configured with an insertion port 30b. The cylindrical portion 32 has the accommodating cavity 30a due to its cylindrical shape. The end of the accommodating cavity 30a away from the movement 20 is covered by the bottom plate 31, and the end of the accommodating cavity 30a close to the movement 20 is configured with an insertion port 30b, so that the circuit board 24 can extend into the accommodating cavity 30a through the insertion port 30b, thereby shortening the length of the handle shell 10.

[0092] See also Figure 2 as well as Figure 7 Furthermore, the plastic liner 12 is also cylindrical, and includes a connecting section 121 close to the bottom plate 31 and a fixing section 122 for the bracket 21. It can be understood that the connecting section 121 is also cylindrical, and the cylindrical portion 32 is inserted through the cylindrical connecting section 121 and is sealed and connected to the connecting section 121. Exemplarily, the cylindrical portion 32 can also be made of plastic material, and the connecting section 121 is also made of plastic material, so that the cylindrical portion 32 and the connecting section 121 can be better sealed by interference fit.

[0093] See also Figure 8 Furthermore, the thickness of the connecting section 121 is smaller than the thickness of other parts of the plastic liner 12 (i.e., the fixing section 122). Since the connecting section 121 is used to cooperate with the cylindrical portion 32, the outer diameter of the cylindrical portion 32 can be increased by thinning the thickness of the connecting section 121. Correspondingly, the inner diameter of the accommodating cavity 30a of the cylindrical portion 32 can also be set larger, and the extending section 241 extending into the accommodating cavity 30a can have a larger width, thereby being able to integrate more electronic devices, which is more conducive to shortening the length of the handle shell 10. In addition, by thinning the thickness of the connecting section 121 to install the cylindrical portion 32 with a larger outer diameter, the metal shell 11 can have a smaller diameter compared to installing the cylindrical portion 32 with a larger outer diameter by increasing the diameter of the metal shell 11.

[0094] See also Figure 8 as well as Fig.10 In some embodiments, the bottom end of the plastic liner 12 is retracted into the installation cavity 10a relative to the bottom end of the metal shell 11, so that a first step structure 13 is formed between the bottom end of the plastic liner 12 and the bottom end of the metal shell 11. In other words, the bottom end of the metal shell 11 protrudes from the bottom end of the plastic liner 12 to form the first step structure 13, and the step surface of the first step structure 13 is also the end surface of the bottom end of the plastic liner 12.

[0095] The bottom plate 31 includes an annular protrusion 311 protruding relative to the cylindrical portion 32. Specifically, the bottom plate 31 protrudes from the outer peripheral surface of the cylindrical portion 32 along the radial direction of the cylindrical portion 32, so that a second step structure 33 is formed between the annular protrusion 311 and the cylindrical portion 32. The step surface of the second step structure 33 is also a circle of annular surface of the annular protrusion 311 facing the installation cavity 10a. The second step structure 33 cooperates with the first step structure 13 so that the bottom plate 31 is at least partially located in the metal shell 11. It can be understood that the bottom plate 31 can also be completely accommodated in the metal shell 11. In this way, compared with the bottom plate 31 being completely exposed outside the metal shell 11, the length of the handle shell 10 can be further shortened.

[0096] Please continue reading Figure 8 In some embodiments, the outer side wall of the cylindrical portion 32 is sealed and connected to the inner wall of the handle shell 10. Exemplarily, as mentioned above, the handle shell 10 includes a metal shell 11 and a plastic liner 12 arranged on the inner wall of the metal shell 11, the plastic liner 12 includes a connecting section 121, and the cylindrical portion 32 is passed through the cylindrical connecting section 121 and is sealed and connected to the connecting section 121. Exemplarily, the cylindrical portion 32 can also be made of plastic material, and the connecting section 121 is also made of plastic material, so that the cylindrical portion 32 and the connecting section 121 can be better sealed by interference fit. Alternatively, in other embodiments, the handle shell 10 can be a plastic part or a metal part as a whole, and the outer side surface of the cylindrical portion 32 can be sealed and connected to the plastic inner wall or the metal inner wall of the handle shell 10.

[0097] See also Figure 5 or Figure 8 In some embodiments, the bottom cover 30 further includes a first fastener 35, which is formed by extending from at least one of the bottom plate 31 and the cylindrical portion 32 toward the bracket 21. The bracket 21 includes a second fastener 214, which extends from the bottom end 2111 of the battery compartment shell 211 toward the bottom plate 31, and the second fastener 214 is snap-fitted with the first fastener 35. For example, the first fastener 35 includes a hook, and the second fastener 214 has a slot, and the hook is snapped into the slot. In this way, on the basis of the sealed fit between the cylindrical portion 32 and the handle shell 10, the bottom cover 30 is further snap-fitted with the bracket 21, which can improve the connection stability among the bottom cover 30, the handle shell 10 and the movement 20.

[0098] like Figure 5 As shown, in some embodiments, the buckle group composed of the first buckle member 35 and the second buckle member 214 includes two groups, and the two buckle groups are arranged oppositely and at intervals. For example, the two buckle groups are arranged axially symmetrically about the central axis of the handle shell 10, so that the connection stability between the bottom cover 30 and the bracket 21 can be further improved, and the wind direction of the bottom cover 30 detaching from the bracket 21 can be reduced. And further, as Figure 8As shown, the portion of the circuit board 24 extending into the accommodating cavity 30a is located on one side of the whole formed by the two buckle groups, and is spaced apart from the buckle groups. Thus, during the process of the circuit board 24 extending into the accommodating cavity 30a, the first buckle member 35 and the second buckle member 214 also perform buckle fit. However, since the circuit board 24 and the buckle group are spaced apart from each other, the process of the circuit board 24 extending into the accommodating cavity 30a is not interfered by the buckle group, and the circuit board 24 can smoothly extend into the accommodating cavity 30a. The buckle process of the first buckle member 35 and the second buckle member 214 is also not interfered by the circuit board 24, and the buckle fit can be smoothly achieved.

[0099] See also Figure 8 as well as Fig.10 In some embodiments, the outer wall of the cylindrical portion 32 has a ring-shaped glue-filling groove 32a, and the glue-filling groove 32a is filled with glue (not shown in the figure), and the glue is bonded to the inner wall of the handle shell 10, such as the inner wall of the connecting section 121. In this way, the outer peripheral wall of the bottom cover 30 and the inner peripheral wall of the connecting section 121 are sealed at various positions in the circumferential direction by glue, which can further improve the sealing performance between the bottom cover 30 and the connecting section 121, and prevent liquid or water vapor from entering the mounting cavity 10a from the mounting opening 10b, thereby affecting the electronic devices on the circuit board 24. In addition, when dispensing glue, the amount of glue can be increased to increase the bonding area between the glue and the outer peripheral wall of the bottom cover 30 and the inner peripheral wall of the connecting section 121, so as to further improve the sealing performance between the bottom cover 30 and the connecting section 121.

[0100] In some other embodiments, the outer peripheral wall of the bottom cover 30 has an annular groove 32b arranged in an annular shape, and a sealing ring 34 is arranged in the annular groove 32b. The sealing ring 34 can be an elastic sealing ring 34, for example, a silicone ring or a rubber ring. The sealing ring 34 is interference fit with the inner peripheral wall of the connecting section 121. It can be understood that the sealing ring 34 is squeezed by the inner peripheral wall of the connecting section 121, and the sealing ring 34 is also interference fit with the groove wall of the annular groove 32b. In this way, the sealing ring 34 is used to seal the outer peripheral wall of the bottom cover 30 at various positions in the circumferential direction and the inner peripheral wall of the connecting section 121 at various positions in the circumferential direction, which can further improve the sealing performance between the bottom cover 30 and the connecting section 121, and prevent liquid or water vapor from entering the mounting cavity 10a from the mounting opening 10b, and affecting the electronic devices on the circuit board 24. Moreover, compared with sealing by adhesive, sealing by the sealing ring 34 can save the dispensing process and avoid the risk of adhesive overflowing to the surface of the brush handle.

[0101] In some embodiments, the outer wall of the cylindrical portion 32 has both a glue filling groove 32a and an annular groove 32b. Along the length direction AA of the handle shell 10, the annular groove 32b is located between the bottom plate 31 and the glue filling groove 32a, that is, the glue filling groove 32a is closer to the movement 20 than the annular groove 32b, that is, the glue filling groove 32a is closer to the inside of the mounting cavity 10a than the annular groove 32b. In this way, during assembly, the glue overflowing from the glue filling groove 32a can be blocked by the sealing ring 34 and will not flow through the sealing ring 34 and overflow to the outer surface of the handle shell 10. The bonding area between the glue and the inner wall of the handle shell 10 can also be increased, thereby further improving the sealing performance between the cylindrical portion 32 and the inner wall of the handle shell 10.

[0102] It is understandable that when the cylindrical portion 32 is directly fixed to the inner wall of the handle shell 10 by adhesive or a sealing ring 34, the first fastener 35 and the second fastener 214 may not be provided, thereby eliminating the length of the fastener group, thereby shortening the distance from the bottom cover 30 to the bottom of the battery compartment shell 211, thereby further shortening the length of the handle shell 10.

[0103] Please refer to Figure 1 as well as Figure 8-9 In some embodiments, the electric toothbrush 100 further includes the aforementioned charging component 50, which is disposed on the handle shell 10, penetrates the handle shell 10 and is electrically connected to the circuit board 24. In this way, the length of the bottom cover 30 that needs to be increased due to the provision of the charging component 50 is omitted, thereby reducing the distance between the bottom cover 30 and the bottom end 2111 of the battery compartment shell 211, and thus further shortening the length of the handle shell 10. If the charging component 50 is disposed on the bottom cover 30, since the charging component 50 has a certain length, the handle shell 10 needs to increase its length accordingly to cover the periphery of the bottom cover 30 and the charging component 50, resulting in a longer overall length of the electric toothbrush 100. Exemplarily, the charging component 50 may include a charging interface such as a Type-C interface or include a charging base and a charging pin disposed in the charging base.

[0104] The same or similar numbers in the drawings of this embodiment correspond to the same or similar items; in the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or position relationship based on the orientation or position relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0105] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An electric toothbrush, characterized in that: The electric toothbrush comprises: A handle shell having a mounting cavity, and a bottom end of the handle shell having a mounting opening communicating with the mounting cavity; A movement, installed in the installation cavity, the movement comprising a bracket and a circuit board, the bracket being fixed to the handle shell, the circuit board being installed on the bracket and extending along the length direction of the handle shell; A bottom cover is connected to the handle shell and / or the bracket and covers the installation opening. The bottom cover has a receiving cavity communicated with the installation cavity, and the circuit board partially extends into the receiving cavity.

2. The electric toothbrush according to claim 1, characterized in that: The movement also includes a battery electrically connected to the circuit board, and the bracket includes: A battery compartment shell, wherein the battery is installed in the battery compartment shell, and the bottom of the battery compartment is opposite to the bottom cover and is spaced apart from each other; Wherein, the circuit board is mounted on the outer surface of the battery compartment shell and extends toward the bottom cover along the length direction beyond the bottom end of the battery compartment shell.

3. The electric toothbrush according to claim 2, characterized in that: The support also includes: A support plate extends from the bottom end of the battery compartment shell toward the bottom cover to support the circuit board.

4. The electric toothbrush according to claim 2, characterized in that: The movement also includes a motor and a display unit electrically connected to the circuit board, and the bracket also includes: A motor housing shell connected to an end of the battery housing shell away from the bottom cover along the length direction of the handle shell, and the motor is installed in the motor housing shell; Wherein, the display component is arranged on the outer surface of the motor housing, and the display component and the circuit board are located on the same side of the bracket, and the circuit board extends to the outer surface of the motor housing.

5. The electric toothbrush according to claim 1, characterized in that: The handle shell has a center dividing surface that bisects the handle shell along the front-to-back direction. The bracket has a front side surface and a rear side surface that are disposed opposite to each other along the front-to-back direction. The front side surface of the bracket is closer to the center dividing surface than the rear side surface. The circuit board is mounted on the front side surface. Wherein, the handle shell includes a button, and the front side surface is arranged toward the button.

6. The electric toothbrush according to claim 5, characterized in that: The movement also includes a motor arranged on the bracket, and the output shaft of the motor is located between the center dividing surface and the rear side surface.

7. The electric toothbrush according to claim 1, characterized in that: The circuit board comprises: An extending section, located in the accommodating cavity; The external section is located outside the accommodating cavity and inside the mounting cavity. Along the width direction perpendicular to the length direction of the handle shell, the width of the external section is greater than the width of the extending section.

8. The electric toothbrush according to claim 1, characterized in that: The handle shell comprises: Metal housing, The plastic lining is fixed to the inner wall of the metal shell, and the plastic lining is molded with a connecting structure, and the bracket is connected to the connecting structure so that the movement is fixed in the handle shell.

9. The electric toothbrush according to claim 8, characterized in that: The bottom cover comprises: A bottom plate, used for covering the installation opening; The cylindrical portion is arranged in a cylindrical shape on the surface of the bottom plate facing the installation cavity and has the accommodating cavity. An insertion port is configured at one end of the cylindrical portion away from the bottom plate so that the circuit board can extend into the accommodating cavity through the insertion port. The plastic liner is cylindrical and includes a connecting section close to the bottom plate, the cylindrical portion passes through the connecting section and is sealed to the connecting end, and the thickness of the connecting section is smaller than the thickness of other parts of the plastic liner.

10. The electric toothbrush according to claim 9, characterized in that: The bottom end of the plastic liner is retracted into the installation cavity relative to the bottom end of the metal shell, so that a first step structure is formed between the bottom end of the plastic liner and the bottom end of the metal shell; The bottom plate includes an annular protrusion protruding relative to the cylindrical portion, so that a second step structure is formed between the annular protrusion and the cylindrical portion, and the second step structure cooperates with the first step structure so that the bottom plate is at least partially located in the metal shell.

11. The electric toothbrush according to claim 1, characterized in that: The bottom cover comprises: A bottom plate, used for covering the installation opening; The cylindrical portion is arranged in a cylindrical shape on the surface of the base plate facing the installation cavity, and together with the base plate, forms the accommodating cavity. An insertion port is configured at the end of the cylindrical portion away from the base plate, so that the circuit board can extend into the accommodating cavity through the insertion port, and the outer wall of the cylindrical portion is sealed and connected to the inner wall of the handle shell.

12. The electric toothbrush according to claim 11, characterized in that: The bottom cover further includes a first fastener, which extends from at least one of the bottom plate and the cylindrical portion toward the bracket; the movement further includes a battery electrically connected to the circuit board, and the bracket includes: A battery compartment shell, wherein the battery is installed in the battery compartment shell, and the bottom of the battery compartment shell is arranged opposite to the bottom plate; and The second fastener extends from the bottom of the battery compartment shell toward the bottom plate, and the second fastener is fastened to the first fastener.

13. The electric toothbrush according to claim 12, characterized in that: The buckle group formed by the first buckle member and the second buckle member includes two groups, the two buckle groups are opposite and spaced apart, and the portion of the circuit board extending into the accommodating cavity is located on one side of the whole formed by the two buckle groups and spaced apart from the buckle groups.

14. The electric toothbrush according to claim 11, characterized in that The outer wall of the cylindrical portion has a glue filling groove arranged in an annular shape, the glue filling groove is filled with glue, and the glue is bonded to the inner wall of the handle shell; and / or, The outer wall of the cylindrical portion has an annular groove arranged in an annular shape, a sealing ring is arranged in the annular groove, and the sealing ring is interference-fitted with the inner wall of the handle shell.

15. The electric toothbrush according to claim 14, characterized in that The outer side wall of the cylindrical portion has both the glue filling groove and the annular groove. Along the length direction of the handle shell, the annular groove is located between the bottom plate and the glue filling groove.

16. The electric toothbrush according to any one of claims 1 to 15, characterized in that: Also includes; The charging component is arranged on the handle shell, penetrates the handle shell and is electrically connected to the circuit board.

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