Oral care device and forming process of handle shell thereof

Abstract

Provided are an oral care device and a forming process of a handle shell (10). The oral care device comprises the handle shell (10) and a core assembly (30). The handle shell (10) comprises a metal housing (11) and a plastic lining (12). The metal housing (11) is a metal member. The plastic lining (12) is a plastic member, and is at least partially fixed to an inner wall of the metal housing (11). The plastic lining (12) comprises a first connecting structure (121), and at least one of the metal housing (11) and the plastic lining (12) is provided with a mounting cavity (10a). The core assembly (30) is mounted in the mounting cavity (10a), and is fixed to the inner wall of the metal housing (11) by means of the first connecting structure (121).

Description

Oral care device and its handle shell molding process Technical Field

[0001] The present application relates to the field of oral cleaning technology, and in particular to an oral care device and a molding process for a handle shell thereof. Background Art

[0002] In the related art, oral care devices, such as electric toothbrushes, generally include a handle shell and a movement disposed within the handle shell, with the output shaft of the movement extending out of the handle shell and connected to the brush head. The movement drives the brush head to vibrate at a high frequency, and the high-frequency vibrating brush head contacts the teeth or gums, thereby cleaning the user's oral cavity. In order to achieve stable assembly of the movement within the handle shell, the handle shell is usually made of hard plastic, and the support of the movement is also made of hard plastic. This makes it easy to form mutually matching connecting structures on the inner wall of the handle shell and the support through the injection molding process, thereby achieving stable installation of the movement and the handle shell through the connecting structure.

[0003] When the handle shell needs to be made of metal, it is usually made through metal processing processes such as forging, die casting and compression casting. The above metal processing processes either cannot produce a connecting structure on the metal or the processing accuracy is too low, affecting the subsequent positioning and installation of the movement and the metal handle shell.

[0004] Summary of the Invention

[0005] The present application provides a molding process for an oral care device and a handle shell thereof, which can form a first connecting structure through an injection molding process, and connect the first connecting structure to the movement to achieve fixed installation of the movement in the handle shell. The process is simple and the production efficiency is high.

[0006] A first aspect of an embodiment of the present application provides an oral care device, comprising:

[0007] A handle shell, the handle shell comprising a metal shell and a plastic liner, the metal shell being a metal part, the plastic liner being a plastic part, the plastic liner being at least partially fixed to an inner wall of the metal shell, the plastic liner comprising a first connecting structure, and at least one of the metal shell and the plastic liner defining a mounting cavity;

[0008] The core is installed in the installation cavity and is fixed to the inner wall of the metal shell through the first connecting structure.

[0009] A second aspect of an embodiment of the present application provides a molding process for a handle shell, wherein the molding process includes the following steps:

[0010] Separately mold a metal shell and a plastic lining, and then sleeve the metal shell onto the plastic lining through a dispensing process; or

[0011] First, a metal shell is formed, and the metal shell is placed in an injection mold. A plastic lining is injection-molded on the inner wall of the metal shell so that the plastic lining and the metal shell are formed into one piece.

[0012] Optionally, the plastic lining includes a first lining, a second lining, and a third lining connected in sequence, and the metal shell includes a first shell sleeved on the first lining and a third shell sleeved on the third lining. Before or after the step of sleeve-fitting the metal shell onto the outside of the plastic lining by a dispensing process, or after the step of placing the metal shell into an injection mold and injection-molding the plastic lining on the inner wall of the metal shell, the following steps are included:

[0013] A second outer shell is formed on the second inner liner through an injection molding process.

[0014] A third aspect of the present application provides a molding process for a handle shell, wherein the plastic lining includes a first lining and a third lining, the metal shell includes a first shell sleeved on the first lining and a third shell sleeved on the third lining, and the handle shell further includes a second lining and a second shell; the molding process for the handle shell includes:

[0015] First, a metal shell is formed, wherein the metal shell includes the first shell and the third shell;

[0016] milling a second lining on the metal shell, wherein the second lining is a metal part;

[0017] The metal shell is placed in an injection mold, a first lining is formed inside the first shell, a second shell is formed on the outer wall of the second lining, and a third lining is formed on the inner wall of the third shell.

[0018] In the molding process of the oral care device and the handle shell thereof of the embodiment of the present application, the plastic lining includes a first connecting structure, which includes but is not limited to a snap-on structure, a limiting structure, a guide structure, and a fixing structure that cooperate with the movement. At least one of the metal shell and the plastic lining structure is provided with an installation cavity. The movement is installed in the installation cavity, and the movement is fixed to the inner wall of the metal shell by the first connecting structure. In this way, since the plastic lining is a plastic part, it is convenient to mold the first connecting structure by an injection molding process, and connect it to the movement through the first connecting structure, so that the movement is fixedly installed in the handle shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0020] FIG1 is a schematic structural diagram of an electric toothbrush in an embodiment of the present application;

[0021] FIG2 is a schematic diagram of the exploded structure of the electric toothbrush shown in FIG1 ;

[0022] FIG3 is a schematic diagram of the exploded structure of the electric toothbrush shown in FIG1 ;

[0023] FIG4 is a schematic structural diagram of a handle shell in one embodiment of the present application;

[0024] FIG5 is a structural schematic diagram of the handle housing of FIG4 from another perspective;

[0025] FIG6 is a schematic diagram of the exploded structure of the handle housing shown in FIG4 ;

[0026] FIG7 is a schematic structural diagram of the handle housing of FIG4 from another perspective;

[0027] FIG8 is a cross-sectional view of the handle housing along section AA in FIG7 ;

[0028] FIG9 is an enlarged structural diagram of portion B in FIG8 ;

[0029] FIG10 is a schematic structural diagram of a handle housing and a movement in one embodiment of the present application;

[0030] FIG11 is a schematic diagram of the exploded structure of a movement in one embodiment of the present application;

[0031] FIG12 is another structural schematic diagram of the handle housing and the movement in one embodiment of the present application;

[0032] FIG13 is a cross-sectional view of FIG12 along the BB section;

[0033] FIG14 is an enlarged structural diagram of portion A in FIG13 ;

[0034] FIG15 is a schematic diagram of the exploded structure of a movement in another embodiment of the present application;

[0035] FIG16 is a schematic structural diagram of a bottom cover in one embodiment of the present application;

[0036] FIG17 is a schematic structural diagram of an electric toothbrush according to an embodiment of the present application;

[0037] FIG18 is an enlarged structural diagram of a portion I in FIG1;

[0038] FIG19 is a cross-sectional view of the metal handle of the electric toothbrush having a metal handle in FIG1;

[0039] FIG20 is an enlarged structural diagram of a portion II in FIG3 ;

[0040] Figure 21 is a schematic structural diagram of the movement in Figure 1;

[0041] FIG22 is a schematic structural diagram of the metal handle (with the movement omitted) of the electric toothbrush with a metal handle in FIG1 ;

[0042] FIG23 is a cross-sectional view of the metal handle (movement omitted) along line BB in FIG5 ;

[0043] FIG24 is a schematic diagram of a process flow of a molding process for a handle shell in one embodiment of the present application;

[0044] FIG25 is a schematic flow chart of a molding process for a handle shell in another embodiment of the present application.

[0045] Explanation of the accompanying reference numerals: 100 - electric toothbrush; 10 - handle shell; 10a - mounting cavity; 10A - first section; 10B - second section; 10C - third section; 11 - metal shell; 11a - first hollow hole; 11b - first mounting hole; 111 - protrusion; 11A - first shell; 11B - second shell; 11C - third shell; 12 - plastic lining; 12A - first lining; 12B - second lining; 12C - third lining; 12a - groove; 12b - second hollow hole; 12c - second mounting hole; 121 - first connecting structure; 1211 - first limiting portion; 1212 - second limiting portion; 1213 - first guide portion; 122 - cylindrical body; 123 - supporting platform; 124 - limiting section; 1241 - transition slope; 124a - limiting cavity; 127 - sealing section; 128 - connecting section; 13 - interactive member; 131 - key cap; 1311 - annular protrusion; 132 - light-transmitting panel; 130 - bottom cover; 1301 - bottom plate; 1302 - cylindrical portion; 135 - first step structure; 136 - second step structure; 137 - first fastener; 138 - sealing ring; 139 - adhesive; 140 - sealing member; 141 - key cap area; 14a - light-transmitting area; 20 - brush head; 2112 - adhesive-filled groove; 30 - movement; 30a - accommodating cavity; 30b - insertion port; 31 - circuit board; 311 - insertion section; 312-external section; 32-battery; 32a-glue filling groove; 32b-annular groove; 33-motor; 331-output shaft; 34-bracket; 34a-front side; 34b-rear side; 341-battery compartment shell; 3411-bottom end; 342-motor compartment shell; 343-support plate; 344-second fastener; 35-button; 36-display light source; 301-second connecting structure; 3011-second latching protrusion; 3012-second guide portion. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0047] In a first aspect, embodiments of the present application provide an oral care device, including but not limited to an electric toothbrush, an oral irrigator, an oral examination device, etc. It is understood that the solutions of the embodiments of the present application can also be applied to other non-oral care devices, such as any handheld device such as a beauty instrument. The following description will be based on an electric toothbrush 100 as the oral care device.

[0048] Please refer to Figures 1-2. An embodiment of the present application provides an electric toothbrush 100 for cleaning a user's oral cavity. The electric toothbrush 100 includes a handle shell 10, a brush head 20, and a movement 30 disposed in the handle shell 10.

[0049] The handle shell 10 serves as an exterior component of the electric toothbrush 100 and is suitable for being held by a user to facilitate the user in using the electric toothbrush 100. At the same time, the handle shell 10 can also protect the movement 30 installed therein.

[0050] The movement 30 is the power component that enables the brushing function of the electric toothbrush 100. It includes a circuit board 31, a battery 32, a motor 33, and a bracket 34. The bracket 34 supports the circuit board 31, battery 32, motor 33, and other components. The battery 32 powers the motor 33 and the circuit board 31, while the circuit board 31 controls the operation of the motor 33. The high-frequency vibration energy of the motor 33 is transmitted to the brush head 20 via the output shaft. When the brush head 20 is applied to the user's mouth, it cleans the user's mouth.

[0051] Referring to Figures 2-3, in some embodiments, the handle housing 10 includes a metal shell 11 and a plastic liner 12. The metal shell 11 is a metal component, for example, aluminum or stainless steel. The plastic liner 12 is a plastic component that is at least partially fixed to the inner wall of the metal shell 11. Specifically, the plastic liner 12 can be installed on the inner wall of the metal shell 11 through an injection molding process or a dispensing assembly process.

[0052] Please refer to Figure 2. The plastic lining 12 includes a first connecting structure 121. The first connecting structure 121 includes but is not limited to a snap-on structure, a limiting structure, a guiding structure, and a fixing structure that cooperate with the movement 30. At least one of the metal shell 11 and the plastic lining 12 is provided with a mounting cavity 10a. The movement 30 is installed in the mounting cavity 10a, and the movement 30 is fixed to the inner wall of the metal shell 11 through the first connecting structure 121. In this way, since the plastic lining 12 is a plastic part, it is convenient to mold the first connecting structure 121 through the injection molding process, and connect it to the movement 30 through the first connecting structure 121, so that the movement 30 is fixed in the handle shell 10.

[0053] In contrast, forming the first connecting structure 121 on the inner wall of the metal housing 11 would present significant manufacturing challenges. Common metalworking techniques include forging, die-casting, and compression casting. Because forging is fundamentally about forging, it is not possible to form the first connecting structure 121. While die-casting and compression casting can form the first connecting structure 121, they cannot accurately form the first connecting structure 121 at a specific location on the inner wall of the metal housing 11, resulting in the first connecting structure 121 being unable to align with the movement 30.

[0054] Referring to Figures 4-6, in some embodiments, a protrusion 111 is provided on one of the inner wall of the metal shell 11 and the outer wall of the plastic liner 12, and a groove 12a is provided on the other, with the protrusion 111 being embedded in the groove 12a. For example, the inner wall of the metal shell 11 is provided with a protrusion 111, and the outer wall of the plastic liner 12 is provided with a groove 12a, and the protrusion 111 is embedded in the groove 12a. The mutual limitation between the protrusion 111 and the groove 12a prevents the plastic liner 12 from moving along the length direction of the handle shell 10 or rotating in the circumferential direction of the handle shell 10, thereby improving the installation stability of the plastic liner 12 on the metal shell 11. Since the movement 30 is connected to the first connecting structure 121, the installation stability of the movement 30 on the metal shell 11 is indirectly improved.

[0055] Please refer to Figure 6. In some embodiments, a groove 12a is provided on the outer wall of the plastic lining 12, and the groove 12a extends along the length direction of the handle shell 10. In this way, the length of the groove 12a can be increased. A protrusion 111 embedded in the groove 12a is provided on the inner wall of the metal shell 11. The length of the protrusion 111 can also be set to be longer. Therefore, the cooperation between the protrusion 111 and the groove 12a has a better limiting effect on the metal shell 11 and the plastic lining 12. However, the groove 12a does not penetrate the two ends of the plastic lining 12 in the length direction of the handle shell 10, so that the plastic lining 12 is not divided into two parts by the groove 12a, and the plastic lining 12 is still an integral part. In this way, it is convenient to mold the plastic lining 12 in a one-time injection molding process, and the plastic lining 12 is an integral part. The various parts of the plastic lining 12 are interconnected and limited, which can improve the installation stability of the plastic lining 12 in the metal shell 11, and after the first connecting structure 121 is connected to the movement 30, the fixing effect of the movement 30 can be improved.

[0056] Referring to Figure 2 , in other embodiments, the inner wall of the metal shell 11 is smooth, that is, without the protrusions 111, and the plastic liner 12 is fixed to the smooth wall via injection molding. This eliminates the need for machining structures such as the protrusions 111 onto the inner wall of the metal shell 11, simplifying the process. Furthermore, the injection molding of the plastic liner 12 onto the smooth wall increases the contact area and tightness of the connection between the plastic liner 12 and the inner wall of the metal shell 11, thereby improving the stability of the connection between the plastic liner 12 and the inner wall of the metal shell 11.

[0057] Please refer to Figures 4 and 6. In some embodiments, the contour lines of the inner wall of the metal shell 11 and the contour lines of the inner wall of the plastic lining 12 are both non-standard circles. In this way, the metal shell 11 can prevent the plastic lining 12 from rotating in the circumferential direction of the handle shell 10, and the plastic lining 12 can prevent the mobile phone core 30 from rotating in the circumferential direction of the handle shell 10, thereby improving the stability of the metal shell 11, the plastic lining 12 and the mobile phone core 30 in the circumferential direction of the handle shell 10.

[0058] Referring to Figures 7-9, in some embodiments, along the radial direction of the handle shell 10, the plastic lining 12 has a first thickness H1, and the metal shell 11 has a second thickness H2, where the first thickness H1 is greater than the second thickness H2. Since the metal shell 11 is generally heavier, the thickness of the metal shell 11 is thinner than the thickness of the plastic lining 12, thereby reducing the overall weight of the handle shell 10. In addition, the thicker plastic lining 12 facilitates the installation of the first connecting structure 121 for mounting the movement 30. Furthermore, during the operation of the movement 30, the thicker plastic lining 12 can cushion the vibration of the movement 30.

[0059] Please continue to refer to Figure 9. In some embodiments, along the radial direction of the handle shell 10, the plastic lining 12 has a first thickness H1, and the first thickness H1 is not less than 0.4 mm. Since the structural strength of the plastic lining 12 made of plastic material is relatively low, the first thickness H1 is not less than 0.4 mm. This ensures that the plastic lining 12 has sufficient structural strength to achieve a stable connection with the movement 30. In addition, the first thickness H1 is not less than 0.4 mm, making the plastic lining 12 easier to be injection molded as one piece. If the first thickness H1 is less than 0.4 mm, the structural strength of the plastic lining 12 is insufficient, and deformation or structural damage is likely to occur, affecting the stable installation of the movement 30 on the plastic lining 12. In addition, the plastic lining 12 is too thin, which increases the difficulty of injection molding, and potholes are prone to appear on the surface of the plastic lining 12.

[0060] In some embodiments, the plastic lining 12 is molded on the inner wall of the metal shell 11 through an injection molding process. After the metal shell 11 is molded, the plastic lining 12 can be molded on the inner wall of the metal shell 11 through an injection molding process. The plastic lining 12 is attached and connected to the inner wall of the metal shell 11. In this way, the injection molding process is simple, and the connection stability between the metal shell 11 and the plastic lining 12 is better.

[0061] In other embodiments, the metal shell 11 and the plastic liner 12 are separate components, with the metal shell 11 assembled to the plastic liner 12. In this embodiment, the plastic liner 12 is first formed through an injection molding process. The metal shell 11 is also independently formed through a wire drawing process. The metal shell 11 is sleeved onto the plastic liner 12 and fixedly connected to the plastic liner 12 through a dispensing process, making the manufacturing process of the metal shell 11 and the plastic liner 12 more flexible.

[0062] Please refer to Figures 4 and 9. In some embodiments, the two ends of the plastic lining 12 along the length of the handle shell 10 are flush with the two ends of the metal shell 11 along the length of the handle shell 10, so that most areas of the handle shell 10 are double-layer structures. In this way, when the electric toothbrush 100 accidentally falls, the plastic lining 12 and the metal shell 11 are less likely to suffer structural damage, and when the end of the handle shell 10 touches the ground, the metal shell 11 and the ends of the plastic lining 12 share the impact force, making it less likely to suffer structural damage. The two ends of the plastic lining 12 are flush with the two ends of the metal shell 11, which also makes it easier to accommodate the injection mold for manufacturing the plastic lining 12. If the ends of the plastic lining 12 are not flush with the ends of the metal shell 11, there will be a step structure. The injection mold needs to have features that form this step structure, and the structure of the injection mold will become complicated.

[0063] Referring to FIG. 2 , in some embodiments, the movement 30 includes a second connecting structure 301. The cooperation relationship between the second connecting structure 301 and the first connecting structure 121 includes at least one of snap-fitting, mutual limiting, mutual fixation, and mutual guiding. When the second connecting structure 301 and the first connecting structure 121 are snap-fitted, mutually limited, or mutually fixed, the movement 30 and the plastic lining 12 can be stably installed. When the second connecting structure 301 and the first connecting structure 121 are mutually guided, the movement 30 can be guided and positioned during the installation of the movement 30 to the plastic lining 12, thereby achieving rapid installation of the movement 30 in the handle shell 10 and improving installation efficiency.

[0064] Please refer to Figures 2 and 8. In some embodiments, the first connecting structure 121 includes a first limiting portion 1211 and a second limiting portion 1212 spaced apart along the length direction of the handle shell 10. The first limiting portion 1211 presses against one end of the movement 30 in the length direction of the handle shell 10, and the second limiting portion 1212 presses against the other end of the movement 30 in the length direction of the handle shell 10. That is, the opposite ends of the movement 30 are respectively pressed against the first limiting portion 1211 and the second limiting portion 1212. Therefore, the movement 30 is limited by the first limiting portion 1211 and the second limiting portion 1212 along the length direction of the handle shell 10, and the first limiting portion 1211 and the second limiting portion 1212 prevent the movement of the movement 30 along the length direction of the handle shell 10. It is understandable that at least one of the first limiting portion 1211 and the second limiting portion 1212 can also limit the movement 30 in the circumferential direction of the handle shell 10 to prevent the movement 30 from rotating in the circumferential direction of the handle shell 10.

[0065] In some embodiments, the plastic liner 12 has a limiting section 124 disposed near a care module of the oral care device. When the oral care device is an electric toothbrush 100, the care module may be the brush head 20. The limiting section 124 may be a tapered section located near the brush head 20. The limiting section 124 defines a limiting cavity 124a therein. The limiting cavity 124a may be a tapered cavity with a cross-section that decreases as it approaches the brush head 20. The first limiting portion 1211 may be a cavity wall of the limiting cavity 124a or a raised portion disposed on the cavity wall (not shown).

[0066] In some embodiments, the second limiting portion 1212 includes a first latching protrusion or a first latching groove disposed away from the limiting section 124, and the second connecting structure 301 includes a second latching groove cooperating with the first latching protrusion or a second latching protrusion 3011 cooperating with the first latching groove. That is, the second limiting portion 1212 limits the movement 30 in a snap-fit ​​manner. In this way, through pre-design, the second limiting portion 1212 can be snap-fitted with the second connecting structure 301 on the movement 30 while the first limiting portion 1211 abuts against the movement 30. At this time, the movement 30 is assembled in place on the plastic lining 12. In this way, the assembly process is simpler and more efficient, and the movement 30 is limited in the length direction of the handle shell 10 at the same time.

[0067] Referring to FIG. 2 and FIG. 8 , in some embodiments, the first connecting structure 121 includes a first guide portion 1213, which may be, for example, a slide groove (or a slide rail); the second connecting structure 301 includes a second guide portion 3012 (the second guide portion 3012 may be a slide rail that cooperates with the slide groove, or a slide groove that cooperates with the slide rail). The second guide portion 3012 and the first guide portion 1213 extend along the length of the handle shell 10 and can slide together along the length of the handle shell 10. In this way, during the process of installing the movement 30 to the plastic liner 12, the movement 30 can be guided and positioned, thereby achieving rapid installation of the movement 30 and the plastic liner 12 and improving installation efficiency.

[0068] Referring to Figures 2 and 8 , in some embodiments, the plastic liner 12 further includes a cylindrical body 122, which is injection-molded onto the inner wall of the metal shell 11. This allows the cylindrical body 122 to be positioned snugly against the inner wall of the metal shell 11, increasing the contact area between the cylindrical body 122 and the inner wall of the metal shell 11 and improving the stability of the connection between the plastic liner 12 and the metal shell 11. The first connecting structure 121 is integrally molded simultaneously with the molding of the cylindrical body 122, simplifying the process and reducing manufacturing costs.

[0069] In other embodiments, the cylindrical body 122 may not be provided, and the first connecting structure 121 may be directly molded onto the inner wall of the metal shell 11 through an injection molding process. In this way, less consumable material is used for the plastic lining 12, and the plastic lining 12 occupies less internal space of the handle shell 10, which helps to reduce the radial dimension of the handle shell 10.

[0070] Referring to Figure 2, in some embodiments, the metal shell 11 is entirely metal, the plastic lining 12 is entirely plastic, and the metal shell 11 has a first hollow hole 11a. The handle housing 10 also includes an interactive component 13, which enables user interaction with the electric toothbrush 100. The interactive component 13 includes at least one of a button cap 131 and a light-transmitting panel 132. When the interactive component 13 includes the button cap 131, the movement 30 includes a button 35 corresponding to the button cap 131. When the interactive component 13 includes the light-transmitting panel 132, the movement 30 includes a display light source 36 corresponding to the light-transmitting panel 132. The display light source 36 includes at least one of a display screen and a light bead. The interactive component 13 is embedded in the first hollow hole 11a. When the button cap 131 is pressed, it can contact the button 35 inside the handle housing 10 and trigger the corresponding control function. Alternatively, light emitted by the display light source 36 can be transmitted through the light-transmitting panel 132 in the first hollow hole 11a to realize the display function.

[0071] Furthermore, the interactive component 13 blocks the first hollow hole 11 a , thereby not only achieving a sealed connection between the interactive component 13 and the metal housing 11 and improving the waterproof performance, but also improving the connection stability between the interactive component 13 and the metal housing 11 .

[0072] In some embodiments, the plastic lining 12 has a second hollow hole 12b corresponding to the first hollow hole 11a. In this way, when the button cap 131 is pressed, it can contact the button 35 inside the handle shell 10 through the first hollow hole 11a and the second hollow hole 12b and trigger the corresponding control function; or, the light emitted by the display light source 36 can pass through the second hollow hole 12b and pass through the light-transmitting panel 132 in the first hollow hole 11a to realize the display function.

[0073] Please refer to Figure 3. Furthermore, the aperture of the second hollow hole 12b is smaller than the aperture of the first hollow hole 11a, so that the plastic lining 12 located below the first hollow hole 11a forms a supporting platform 123, and the supporting platform 123 supports the interactive part 13. That is, a step structure is formed between the plastic lining 12 and the metal shell 11, and the step surface of the step structure forms the supporting platform 123. The interactive part 13 is supported by the supporting platform 123, so that the interactive part 13 will not sink into the interior of the handle shell 10, especially when the interactive part 13 includes a button 35, the button 35 is pressed by the user, which is easy to cause sinking. This problem can be solved by the supporting platform 123.

[0074] Referring to Figures 1-2, in some embodiments, the interactive component 13 is formed on the metal housing 11 through an injection molding process to seamlessly connect with the metal housing 11. That is, the interactive component 13 is a plastic component or a plastic part, which is formed on the metal housing 11 through an injection molding process, so that the interactive component 13 and the metal housing 11 are seamlessly connected, avoiding the problem of a connection seam between the interactive component 13 and the metal housing 11 causing leakage or dirt to accumulate in the connection seam.

[0075] In some embodiments, the interactive element 13 includes a keycap 131 and a translucent panel 132 , which are integrally formed. This simplifies the production process of the keycap 131 and the translucent panel 132 , improving production efficiency. It also allows for a seamless connection between the keycap 131 and the translucent panel 132 .

[0076] Please refer to Figures 2-3. In some embodiments, the interactive component 13 includes a light-transmitting panel 132, and the movement 30 includes a display light source 36 corresponding to the light-transmitting panel 132. The curvature of the outer surface of the light-transmitting panel 132 is smaller than the curvature of the outer surface of the metal shell 11. That is, the light-transmitting panel 132 is closer to a flat plate than the metal shell 11. In this way, the light-transmitting panel 132 has a smaller ability to bend the light emitted by the display light source 36, thereby reducing the deformation of the display content caused by the light-transmitting panel 132 and improving the display effect.

[0077] In some embodiments, the interactive component 13 includes a translucent panel 132, the movement 30 includes a display light source 36 corresponding to the translucent panel 132, and the plastic lining 12 does not have a second hollow hole 12b. At least the portion of the plastic lining 12 corresponding to the translucent panel 132 is a translucent component. In this manner, light emitted by the display light source 36 can sequentially pass through the plastic lining 12 and the translucent panel 132 to achieve a display function. The plastic lining 12 can be entirely translucent, or only the portion corresponding to the translucent panel 132 can be a translucent component. This embodiment is not limited to this.

[0078] In some embodiments, the interactive component 13 includes a light-transmitting panel 132, and the plastic lining 12 includes a light-transmitting plastic (not shown in the figure). The light-transmitting plastic is filled in the first hollow hole 11a to form the light-transmitting panel 132. That is, the plastic lining 12 does not have a second hollow hole 12b, and the light-transmitting panel 132 is actually a part of the structure of the plastic lining 12. In this way, the light-transmitting panel 132 can be formed at the same time as the plastic lining 12 is formed, without the need to separately set up or form the light-transmitting panel 132. In this way, the manufacturing process is simpler and the production efficiency is higher. In addition, the plastic lining 12 is further connected to the metal shell 11 through the light-transmitting panel 132, which can improve the connection stability between the plastic lining 12 and the metal shell 11.

[0079] In some embodiments, the outer surface of the light-transmitting plastic is provided with a colored paint layer (not shown). The color of the colored paint layer is the same as the color of the metal shell 11. This allows the light-transmitting panel 132 to have the same color as the metal shell 11. To the user, the light-transmitting panel 132 appears to be part of the metal shell 11, which improves the appearance consistency and integrity of the handle housing 10. The color of the colored paint layer can also be similar to that of the metal shell 11, for example, within the same color family, to enhance the aesthetic appearance of the handle housing 10.

[0080] In some embodiments, the interactive component 13 includes a metal button cap 131, which is integrally formed with the metal housing 11. That is, the metal button cap 131 is actually a portion of the metal housing 11, thereby improving the appearance consistency of the handle housing 10. The thickness of the metal at the metal button cap 131 is less than the thickness at other locations of the metal housing 11. By reducing the thickness of the metal at the metal button cap 131, the metal button cap 131 is more likely to deform when pressed by a user, and the deformation amount is greater.

[0081] The thickness of the plastic lining 12 at the location corresponding to the metal keycap 131 is thinner than at other locations of the plastic lining 12. By thinning the plastic lining 12 at the metal keycap 131, the plastic lining 12 at that location is more easily deformed when subjected to pressure from the metal keycap 131. Alternatively, a relief hole (not shown) is provided in the plastic lining 12 at the location corresponding to the metal keycap 131, so that the plastic lining 12 does not interfere with the deformation of the metal keycap 131. The movement 30 includes a distance sensor (not shown) electrically connected to the circuit board 31. The distance sensor is disposed in correspondence with the metal keycap 131 and is used to detect whether the metal keycap 131 is deformed. When the deformation of the metal keycap 131 detected by the distance sensor is greater than a preset threshold, the circuit board 31 determines that the metal keycap 131 has been pressed, and the circuit board 31 then controls the electric toothbrush 100 to perform a function corresponding to the metal keycap 131, such as turning the electric toothbrush on and off, adjusting the brushing mode, etc. For example, the distance sensor may be a photoelectric sensor, a capacitive sensor, or a resistive sensor, which is not limited in this embodiment.

[0082] In some embodiments, the distance sensor includes a light emitter (not shown) and a light receiver (not shown). The light emitter is electrically connected to the circuit board 31 and is positioned toward the metal keycap 131. The light receiver is electrically connected to the circuit board 31 and is configured to receive a light signal emitted by the light emitter and reflected by the metal keycap 131. The circuit board 31 is configured to determine whether the metal keycap 131 is pressed based on the detection signal received by the light receiver. Since the deformation of the metal keycap 131 is relatively small even when pressed, the light emitter and light receiver are configured to detect even small deformations of the metal keycap 131. In other words, the configuration of the light emitter and light receiver improves the sensitivity of detecting deformations of the metal keycap 131. When the deformation of the metal keycap 131 detected by the light receiver is greater than a preset threshold, the circuit board 31 determines that the metal keycap 131 is pressed, and the circuit board 31 then controls the electric toothbrush 100 to perform a function corresponding to the metal keycap 131. Referring to Figures 4-6, in some embodiments, the handle shell 10 includes a first section 10A and a second section 10B connected in sequence along the length direction of the handle shell 10. The first section 10A includes a first outer shell 11A and a first lining 12A fixed to the inner wall of the first outer shell 11A; the metal shell 11 includes at least the first outer shell 11A, that is, at least the first outer shell 11A is a metal part. In this way, the handle shell 10 can have a higher structural strength by utilizing the high hardness of the metal part; the plastic lining 12 includes at least the first lining 12A, that is, at least the first lining 12A is a plastic part, and a first connecting structure 121 can be provided on the inner wall of the first lining 12A, so that the movement 30 can be installed on the first lining 12A through the first connecting structure 121, and indirectly installed on the metal shell 11 through the first lining 12A. The second section 10B includes a second outer shell 11B and a second lining 12B fixed to the inner wall of the second outer shell 11B. An interactive component 13 is provided on the second outer shell 11B. The interactive component 13 includes at least one of a button cap 131 and a light-transmitting panel 132. The second lining 12B cooperates with the button 35 to realize the control function, and the second lining 12B cooperates with the light-transmitting panel 132 to realize the display function of the electric toothbrush 100. In the related art, when the outer shell portion of the handle shell 10 is made of metal, that is, the handle shell 10 includes a metal shell 11, in order to make the handle shell 10 translucent and realize the display function, it is necessary to open a hole in the metal shell 11 and fill the hole with a light-transmitting material to form a light-transmitting panel 132, thereby realizing the display function of the handle shell. However, the production process of the above structure is complicated and the production cost is high. In order to solve this problem, in some embodiments, please refer to Figure 4, the handle shell 10 includes a first section 10A and a second section 10B. At least one of the second section 10B and the first section 10A is connected to the movement 30 . Exemplarily, both the second section 10B and the first section 10A are connected to the movement 30 to enhance the connection stability between the movement 30 and the handle housing 10 .

[0083] At least the outer shell of the second section 10B is a plastic part, or the entire part is a plastic part. The second section 10B includes a light-transmitting panel 132 (as shown by the dotted line in FIG. 4 ). The light-transmitting panel 132 is formed during the injection molding of the second section 10B. The display light source 36 is disposed corresponding to the light-transmitting panel 132. The light emitted by the display light source 36 can pass through the light-transmitting panel 132 and out of the handle housing 10, thereby realizing the display function of the electric toothbrush 100.

[0084] The first section 10A is connected to the second section 10B along the length direction of the handle shell 10. At least the outer shell portion of the first section 10A is a metal part or the entire section is a metal part. The first section 10A can be, for example, aluminum, stainless steel, etc. By utilizing the high hardness of metal parts, the handle shell 10 can have a higher structural strength.

[0085] If a light-transmitting panel 132 is set on the first section 10A, the first section 10A needs to be drawn first, and then a through hole needs to be opened on the first section 10A through machining, and then transparent plastic is filled into the through hole through injection molding to form the light-transmitting panel 132. The above process is complicated and has low production efficiency.

[0086] In this embodiment, by providing a second section 10B connected to the first section 10A, on the one hand, the high hardness of the metal part can be utilized to make the handle shell 10 have a higher structural strength. On the other hand, a light-transmitting panel 132 is provided on the second section 10B, and the light-transmitting panel 132 is formed at the same time as the second section 10B is injection molded. The light-transmitting panel 132 is provided corresponding to the display light source 36 of the movement 30. The light emitted by the display light source 36 is transmitted to the outside of the handle shell 10 through the light-transmitting panel 132 to realize the display function. The second section 10B can be molded on the first section 10A through an injection molding process, and the molding process is simple. Therefore, the production process of the light-transmitting panel 132 can be simplified, thereby improving production efficiency.

[0087] Please refer to Figure 6. In some embodiments, the second section 10B includes a second outer shell 11B and a second lining 12B provided on the inner wall of the second outer shell 11B. The second outer shell 11B is a light-transmitting plastic part. The second lining 12B is provided on the inner wall of the second outer shell 11B. For example, the second outer shell 11B can be molded on the surface of the second lining 12B by an injection molding process. The second lining 12B is a non-light-transmitting plastic part or a non-light-transmitting metal part, and the second lining 12B has a light-transmitting area 14a. When the second lining 12B is a non-light-transmitting plastic part, the light-transmitting area 14a can be reserved when the second lining 12B is injection molded. When the second lining 12B is a non-light-transmitting metal part, the light-transmitting area 14a can be processed by machining. The light-transmitting area 14a and the area of ​​the second shell 11B corresponding to the light-transmitting area 14a constitute a light-transmitting panel 132, and the light emitted by the display light source 36 can pass through the light-transmitting area 14a and the area of ​​the second shell 11B corresponding to the light-transmitting area 14a in turn to pass out of the handle shell 10.

[0088] In some embodiments, the second shell 11B is molded on the surface of the second lining 12B by an injection molding process, and the second shell 11B extends into the light-transmitting area 14a. That is, while the second shell 11B is molded on the surface of the second lining 12B by the injection molding process, the light-transmitting plastic used for injection molding is filled in the light-transmitting area 14a. After the light-transmitting plastic is cured, a portion of the second shell 11B is embedded in the light-transmitting area 14a, thereby increasing the connection area between the second shell 11B and the second lining 12B on the basis of achieving light transmission of the light-transmitting panel 132, improving the connection stability between the second shell 11B and the second lining 12B, and reducing the risk of the second shell 11B falling off from the second lining 12B.

[0089] In other embodiments, the second section 10B includes a second outer shell 11B and a second lining 12B provided on the inner wall of the second outer shell 11B. The second outer shell 11B is a non-light-transmitting plastic part. For example, the second outer shell 11B may be non-light-transmitting plastic, and the second outer shell 11B has an external light-transmitting hole (not shown in the figure). The second lining 12B is a light-transmitting plastic part, and the portion of the second lining 12B extending into the external light-transmitting hole constitutes a light-transmitting panel 132. For example, the light-transmitting panel 132 for extending into the external light-transmitting hole can be formed at the same time as the second lining 12B is formed by an injection molding process. Thereafter, the second outer shell 11B can be formed on the surface of the second lining 12B by an injection molding process. The second outer shell 11B is arranged around the light-transmitting panel 132 and forms an external light-transmitting hole for the light-transmitting panel 132 to extend into.

[0090] Continuing to refer to Figures 4 and 6, in some embodiments, the second outer shell 11B is disposed around the second inner liner 12B, that is, the second outer shell 11B surrounds the second inner liner 12B. This, on the one hand, prevents the second outer shell 11B from being easily separated from the second inner liner 12B in any radial direction, and the connection between the second outer shell 11B and the second inner liner 12B is more stable. On the other hand, the light-transmitting panel 132 can be disposed at any position along the circumference of the second outer shell 11B, making the position of the light-transmitting panel 132 more flexible. In addition, the extension length of the light-transmitting panel 132 can be adjusted along the circumference of the handle shell 10 to adjust the light-transmitting area of ​​the light-transmitting panel 132.

[0091] For example, a light-transmitting panel 132 is provided on at least one of the front, rear, left and right sides of the second section 10B. For another example, a ring-shaped light-transmitting panel 132 can be provided on the second section 10B, so that the handle shell 10 has a light-transmitting position at any position in the circumferential direction. By providing an annular flexible display screen or a ring-shaped array of lamp beads inside the handle shell 10, a ring-shaped display of the handle shell 10 can be achieved, so that when the user observes the handle shell 10 from any radial direction of the handle shell 10, part of the display content can be observed, thereby making the electric toothbrush 100 have a more comprehensive display function.

[0092] In some embodiments, the second shell 11B and the second lining 12B are both plastic parts and are integrally molded. In this embodiment, the second lining 12B and the second shell 11B are both light-transmitting parts. After the first section 10A is molded, the second lining 12B and the second shell 11B can be molded simultaneously in a single injection molding process. In this way, the injection molding process is simpler and the connection stability between the second lining 12B and the second shell 11B is better. Based on this, a light-shielding layer (not shown in the figure) can be provided on the second shell 11B and the second lining 12B, and the area not covered by the light-shielding layer is the light-transmitting panel 132. For example, a light-shielding layer can be provided between the second shell 11B and the second lining 12B, or a light-shielding layer can be provided on the inner wall of the second lining 12B, or a light-shielding layer can be provided on the outer surface of the second shell 11B and a coating layer (not shown in the figure) can be provided on the outer surface of the light-shielding layer. The coating layer can not only improve the smoothness of the surface of the second shell 11B, but also protect the light-shielding layer and prevent the light-shielding layer from being worn by external objects.

[0093] Please continue to refer to Figures 4 and 6. In some embodiments, the second section 10B also includes a button cap 131, the second shell 11B has a first mounting hole 11b, and the second lining 12B has a second mounting hole 12c. The first mounting hole 11b corresponds to the second mounting hole 12c. The button cap 131 is arranged in the first mounting hole 11b and is connected to the second shell 11B, and at least the part where the button cap 131 is connected to the second shell 11B is a soft rubber part. In this way, not only can a seamless connection between the button cap 131 and the second shell 11B be achieved, thereby improving the waterproof performance, but also the connection stability between the button cap 131 and the second shell 11B can be improved. In addition, the soft rubber part is easy to deform, and the button cap 131 can move relative to the second shell 11B, so that when the button cap 131 is pressed by the user, it can move into the handle shell 10 to trigger the corresponding control function.

[0094] Please refer to Figure 6. In some embodiments, the first section 10A further includes a first outer shell 11A and a first inner lining 12A. The first outer shell 11A is a metal part, and the metal shell 11 includes the first outer shell 11A. The first inner lining 12A extends from the second section 10B into the first section 10A and is connected to the inner wall of the first outer shell 11A. Specifically, when the second section 10B is a plastic part as a whole, that is, when the aforementioned second outer shell 11B and the second inner lining 12B are both plastic parts, the first inner lining 12A and the second section 10B are integrally formed, and extend from the second inner lining 12B to the first section 10A, and form a surface connection with the inner wall of the first outer shell 11A, thereby improving the connection stability between the first section 10A and the second section 10B through the first inner lining 12A.

[0095] Please refer to Figures 4 and 6. In some embodiments, the first lining 12A extends to the end of the first section 10A facing away from the second section 10B, that is, the first lining 12A extends from the end of the first section 10A close to the second section 10B to the end of the first section 10A facing away from the second section 10B. In this way, the contact area between the first lining 12A and the first outer shell 11A can be increased, and the connection stability between the first lining 12A and the inner wall of the first outer shell 11A can be improved.

[0096] Referring to Figures 7-9 , in some embodiments, the first thickness H1 of the first lining 12A is greater than the second thickness H2 of the first outer shell 11A. Since the first outer shell 11A is generally heavier, the second thickness H2 of the first section 10A is thinner than the first thickness H1 of the first lining 12A, thereby reducing the overall weight of the handle shell 10. Furthermore, the first lining 12A can also be used to secure the movement 30. The thicker first thickness H1 of the second lining 12B facilitates the installation of the first connecting structure 121 for mounting the movement 30. Furthermore, during operation of the movement 30, the thicker first lining 12A can cushion the vibration of the motor 33.

[0097] In some embodiments, the first thickness H1 of the first lining 12A is not less than 0.6 mm and not greater than 2.5 mm. This facilitates molding the first lining 12A while preventing the first lining 12A from occupying too much of the interior space of the handle shell 10, leaving more space for installing the movement 30. If the first thickness H1 of the first lining 12A is less than 0.6 mm, the thickness of the first lining 12A is too thin, making it difficult to mold the first lining 12A and inconvenient to provide the first connecting structure 121 for installing the movement 30 on the first lining 12A. If the first thickness H1 of the first lining 12A is greater than 2.5 mm, the first thickness H1 of the first lining 12A is too thick, occupying too much interior space of the handle shell 10 in the radial direction of the handle shell 10, making it difficult to install the movement 30 in the handle shell 10.

[0098] In some embodiments, the second thickness H2 of the first shell 11A is not less than 0.3 mm and not greater than 1.2 mm. This ensures that the first shell 11A has sufficient structural strength while also having a suitable weight. If the second thickness H2 of the first shell 11A is less than 0.3 mm, the first shell 11A is too thin and cannot provide sufficient structural strength. If the electric toothbrush 100 is accidentally dropped, the first shell 11A may be easily damaged. If the second thickness H2 of the first shell 11A is greater than 1.2 mm, the first shell 11A is too thick and heavy, resulting in an excessive weight of the handle shell 10 as a whole, which may cause fatigue in the user's hands when brushing their teeth.

[0099] Please refer to Figure 8. In some embodiments, a first connecting structure 121 is provided on the second section 10B and / or the first lining 12A. The first connecting structure 121 is used to cooperate with the second connecting structure 301 on the movement 30 of the electric toothbrush 100. The cooperation relationship between the second connecting structure 301 and the first connecting structure 121 includes at least one of snap connection, mutual limitation, mutual fixation and mutual guidance.

[0100] When the second connecting structure 301 and the first connecting structure 121 are engaged, mutually limited, or fixed to each other, the movement 30 can be stably installed in the handle shell 10. When the second connecting structure 301 and the first connecting structure 121 guide each other, the movement 30 can be guided and positioned during the installation of the movement 30 in the handle shell 10, thereby achieving rapid installation of the movement 30 in the handle shell 10 and improving installation efficiency.

[0101] In some embodiments, the contour lines of the inner wall of the first outer shell 11A and the contour lines of the inner wall of the first lining 12A are both non-standard circles. In this way, the first outer shell 11A can prevent the first lining 12A from rotating in the circumferential direction of the handle shell 10, and the first lining 12A can prevent the movement 30 from rotating in the circumferential direction of the handle shell 10, thereby improving the stability of the first outer shell 11A, the first lining 12A and the movement 30 in the circumferential direction of the handle shell 10.

[0102] In some embodiments, the inner wall of the first shell 11A is smooth, and the first liner 12A is secured to the smooth wall via injection molding. This eliminates the need for machining holes or forming protrusions on the inner wall of the first shell 11A, simplifying the process. Furthermore, securing the first liner 12A to the smooth wall via injection molding increases the contact area and tightness of the connection between the first liner 12A and the inner wall of the first shell 11A, thereby improving the stability of the connection between the first liner 12A and the inner wall of the first section 10A.

[0103] Please refer to Figure 8. In some embodiments, the first lining 12A is molded on the inner wall of the first shell 11A through an injection molding process and is integrally molded with the second section 10B. In this embodiment, the first lining 12A, the second lining 12B and the second shell 11B are all light-transmitting parts. After the first shell 11A is molded, the first lining 12A, the second lining 12B and the second shell 11B can be molded simultaneously in one injection molding process, and the first lining 12A is molded on the inner wall of the first shell 11A. In this way, the injection molding process is simpler, and the connection stability between the first shell 11A and the first lining 12A, between the first lining 12A and the second lining 12B, and between the second lining 12B and the second shell 11B is better.

[0104] In other embodiments, the first outer shell 11A and the first inner liner 12A are separate components, with the first outer shell 11A assembled to the first inner liner 12A, and the first inner liner 12A and the second section 10B integrally formed. In this embodiment, the first inner liner 12A, the second inner liner 12B, and the second outer shell 11B are all light-transmitting components, allowing them to be simultaneously molded in a single injection molding process. The first outer shell 11A can also be molded independently, providing greater manufacturing flexibility. The first outer shell 11A can be sleeved onto the outside of the first inner liner 12A and fixedly connected to the first inner liner 12A via a glue dispensing process.

[0105] Please refer to Figure 8. In some embodiments, a first guide portion 1213 is provided on the inner wall of the second section 10B. The first guide portion 1213 can be, for example, a slide groove (or a slide rail). The first guide portion 1213 is used to slide with the second guide portion 3012 on the movement 30 of the electric toothbrush 100 (see Figure 2, the second guide portion 3012 can be a slide rail that cooperates with the slide groove, or a slide groove that cooperates with the slide rail). In this way, during the process of installing the movement 30 into the handle shell 10, the movement 30 can be guided and positioned, thereby achieving rapid installation of the movement 30 in the handle shell 10 and improving installation efficiency.

[0106] Please refer to Figure 8. Furthermore, the first guide portion 1213, the light-transmitting panel 132, and the key cap 131 are located on different sides of the second segment 10B in the circumferential direction. For example, the light-transmitting panel 132 is located on the front side of the second segment 10B, and the first guide portion 1213 is located on at least one of the left side, right side, and rear side of the second segment 10B. In this way, the first guide portion 1213 is prevented from blocking the light-transmitting panel 132 and the key cap 131, and the first guide portion 1213 is prevented from being disconnected at the light-transmitting panel 132 and the key cap 131 in order for the first guide portion 1213 to avoid the light-transmitting panel 132 and the key cap 131.

[0107] Referring to FIG. 4 , in some embodiments, the first housing 11A includes a key cap region 141 (e.g., the area outlined by the dashed line in FIG. 4 ). The thickness of the key cap region 141 is thinner than at other locations on the first housing 11A. By reducing the metal thickness at the key cap region 141, the key cap region 141 is more likely to deform when pressed by a user, and the deformation is greater. This allows the deformation of the key cap region 141 to be more easily sensed by the light detection sensor within the internal movement 30, thereby triggering the corresponding control function.

[0108] Continuing with FIG4 , in some embodiments, the surface of the second section 10B transitions smoothly with the surface of the first housing 11A. This prevents the connection between the second section 10B and the first housing 11A from being uncomfortable to the touch and also prevents the formation of a seam or step structure where dirt and grime could accumulate.

[0109] Continuing to refer to Figures 4-6, the handle housing 10 further includes a third section 10C, and the first section 10A, the second section 10B, and the third section 10C are sequentially connected along the length direction of the handle housing 10. The third section 10C includes a third outer shell 11C and a third lining 12C fixed to the inner wall of the third outer shell 11C. The metal housing 11 also includes the third outer shell 11C, that is, the third outer shell 11C is a metal component. The second section 10B is supported by the third outer shell 11C and the first outer shell 11A, making the second section 10B more stable on the handle housing 10. Moreover, the presence of the two metal outer shells 11 can improve the overall structural strength of the handle housing 10. The plastic lining 12 also includes a third lining 12C, that is, the third lining 12C is a plastic part, and the first connecting structure 121 can be simultaneously provided on the first lining 12A and the third lining 12C. For example, the third lining 12C is provided with the aforementioned first limiting portion 1211, and the first lining 12A is provided with the aforementioned second limiting portion 1212. In this way, the movement 30 is equivalent to being installed at the same time in the first lining 12A and the third lining 12C, and the movement 30 is installed more stably in the handle shell 10.

[0110] Please refer to Figure 6. In some embodiments, the plastic lining 12 includes a first lining 12A, a second lining 12B, and a third lining 12C. The first lining 12A, the second lining 12B, and the third lining 12C are integrally formed. In this way, the first lining 12A, the second lining 12B, and the third lining 12C can be integrally injection molded, simplifying the production process and reducing production costs. The interactive component 13 includes a light-transmitting panel 132. The second shell 11B is a light-transmitting plastic component. The second shell 11B is molded on the outer wall of the second lining 12B. The second lining 12B has a light-transmitting area 14a corresponding to the light-transmitting panel 132. The light emitted by the display light source 36 can pass through the light-transmitting area 14a and the light-transmitting panel 132 in sequence to the outside of the handle shell 10, thereby realizing the display function.

[0111] The second lining 12B is a non-light-transmitting part, and the light-transmitting area 14a is a second hollow hole 12b opened on the second lining 12B. The second shell 11B is embedded in the second hollow hole 12b, and the part of the second shell 11B embedded in the second hollow hole 12b is light-transmitting. Therefore, on the basis of achieving light transmission of the second hollow hole 12b, the connection area between the second shell 11B and the second lining 12B is increased, the connection stability between the second shell 11B and the second lining 12B is improved, and the risk of the second shell 11B falling off from the second lining 12B is reduced.

[0112] Alternatively, further, the second lining 12B is a translucent plastic part, and a light-shielding layer (not shown in the figure) is further provided on the surface of the second lining 12B. The area of ​​the second lining 12B that is not provided with the light-shielding layer is the translucent area 14a. In this way, light leakage from other areas of the second lining 12B except the translucent area 14a can be avoided, and the light emitted by the display light source 36 can only pass through the second lining 12B from the translucent area 14a, which is conducive to achieving high-contrast and high-brightness display.

[0113] In other embodiments, the second section 10B is entirely a plastic part, and the first liner 12A, the second section 10B, and the third liner 12C are integrally formed. That is, the first liner 12A, the second liner 12B, the second shell 11B, and the third liner 12C are integrally injection molded, simplifying the production process and reducing production costs. In this case, the second shell 11B is a plastic part.

[0114] Furthermore, the interactive component 13 includes a light-transmitting panel 132, the second section 10B is a light-transmitting plastic part as a whole, and a light-shielding layer is provided on the surface of the second section 10B, and the area of ​​the second section 10B where the light-shielding layer is not provided forms the light-transmitting panel 132. In this way, the light emitted by the display light source 36 can pass through the light-transmitting panel 132 of the second section 10B to achieve the display function. Exemplarily, the light-shielding layer can be provided on the inner wall of the second lining 12B to prevent the light-shielding layer from being worn by external objects. A light-shielding layer can also be provided on the outer surface of the second shell 11B and a coating layer (not shown in the figure) can be provided outside the light-shielding layer. The coating layer can not only improve the smoothness of the surface of the second shell 11B, but also protect the light-shielding layer to prevent the light-shielding layer from being worn by external objects.

[0115] In other embodiments, the second lining 12B is a metal component, and the first shell 11A, the second lining 12B, and the third shell 11C are integrally formed; that is, the first shell 11A, the second lining 12B, and the third shell 11C are integrally formed into a single metal component. In this way, the entire handle shell 10 is supported by the metal component along its length, which increases the structural strength of the handle shell 10. Correspondingly, the second shell 11B is a plastic component, which facilitates the installation of the interactive component 13 on the second shell 11B. The second shell 11B is formed on the outer wall of the second lining 12B through an injection molding process, which simplifies the process and improves production efficiency.

[0116] Furthermore, the interactive component 13 includes a translucent panel 132, and the second lining 12B is provided with a second hollow hole 12b corresponding to the translucent panel 132. The light emitted by the display light source 36 can pass through the second hollow hole 12b and the translucent panel 132 in turn to the outside of the handle shell 10 to realize the display function.

[0117] Continuing with FIG6 , in some embodiments, the second outer shell 11B is disposed around the second inner liner 12B, and the light-transmitting area 14a of the second inner liner 12B is located on at least one of the front, rear, left, and right sides of the second inner liner 12B. This allows for greater flexibility in the position of the light-transmitting panel 132. Furthermore, the extended length of the light-transmitting panel 132 can be adjusted along the circumference of the handle shell 10 to adjust the light-transmitting area of ​​the light-transmitting panel 132.

[0118] For example, an annular light-transmitting panel 132 (as shown in the dotted line frame in Figure 6) can be provided on the second shell 11B, so that the handle shell 10 has a light-transmitting position at any position in the circumferential direction. By providing an annular flexible display screen or a circularly arranged lamp bead matrix inside the handle shell 10, an annular display of the handle shell 10 can be achieved, so that when the user observes the handle shell 10 from any radial direction of the handle shell 10, part of the display content can be observed, thereby making the electric toothbrush 100 have a more comprehensive display function.

[0119] In some embodiments, the interactive component 13 includes a button cap 131. The second housing 11B has a first mounting hole 11b, and the second lining 12B has a second mounting hole 12c. The button cap 131 is mounted in the first mounting hole 11b and positioned corresponding to the second mounting hole 12c. Thus, the button cap 131 is secured via the first mounting hole 11b. When the button cap 131 is pressed down, it contacts the button 35 through the second mounting hole 12c, thereby triggering the corresponding function of the button 35.

[0120] Please refer to Figure 8. In some embodiments, the plastic lining 12 includes a first limiting portion 1211 and a second limiting portion 1212 spaced apart along the length direction of the handle shell 10. The first limiting portion 1211 is provided on the third lining 12C, and the first limiting portion 1211 presses against one end of the movement 30 in the length direction of the handle shell 10. The second limiting portion 1212 is provided on the first lining 12A, and the second limiting portion 1212 presses against the other end of the movement 30 in the length direction of the handle shell 10. By respectively providing the first limiting portion 1211 and the second limiting portion 1212 on the third lining 12C and the first lining 12A, the first limiting portion 1211 and the second limiting portion 1212 can press against the opposite ends of the movement 30 to prevent the movement of the movement 30 along the length direction of the handle shell 10.

[0121] Continuing with FIG8 , in some embodiments, the plastic liner 12 further includes a first guide portion 1213, which is provided on at least the third liner 12C. The movement 30 includes a second guide portion 3012, which extends along the length of the handle shell 10 along with the first guide portion 1213 and is capable of slidingly engaging with the first guide portion 1213 along the length of the handle shell 10. Since the third liner 12C is close to the bottom end of the handle shell 10, the movement 30 is inserted into the handle shell 10 from the bottom end. By providing the first guide portion 1213 on at least the third liner 12C, when the movement 30 penetrates the third section 10C, the first guide portion 1213 can slideably engage with the second guide portion 3012, thereby guiding the movement 30 in its insertion into the handle shell 10 and preventing the first guide portion 1213 from misaligning with the second guide portion 3012.

[0122] Please continue to refer to Figure 8. In some embodiments, the first guide portion 1213 also extends along the length direction of the handle shell 10 to the second lining 12B. In this way, the first guide portion 1213 has a longer length and can continue to guide the movement 30 in the second section 10B, ensuring that the movement 30 is positioned accurately, quickly and efficiently during the process of penetrating the handle shell 10, thereby improving the assembly efficiency of the movement 30 and the handle shell 10.

[0123] Furthermore, the portion of the first guide portion 1213 located on the second inner liner 12B is located on a different side of the second inner liner 12B than the interactive element 13. For example, if the interactive element 13 is located on the front side of the second inner liner 12B, the first guide portion 1213 is located on at least one of the left side, right side, and rear side of the second inner liner 12B. This prevents the first guide portion 1213 from blocking the interactive element 13, and also avoids the need for the first guide portion 1213 to be disconnected at the interactive element 13 in order for the first guide portion 1213 to avoid the interactive element 13.

[0124] Referring to FIG. 7 , in some embodiments, along the length direction of the handle housing 10 , the first segment 10A has a third length L3 , the second segment 10B has a second length L2 , and the third segment 10C has a first length L1 .

[0125] In some embodiments, the ratio of the third length L3 to the second length L2 is not less than 1 / 4 and not greater than 1 / 2, and the ratio of the second length L2 to the first length L1 is not less than 1 / 2 and not greater than 3; in this way, the lengths of the first section 10A, the second section 10B and the third section 10C are appropriately distributed, so that the third section 10C and the second section 10B are located in the upper half of the handle shell 10, which facilitates the connection between the third section 10C and the brush head 20 and the user's observation of the second section 10B, and the first section 10A is located in the lower half of the handle shell 10, with sufficient length for the user to achieve a stable grip.

[0126] If the ratio of the third length L3 to the second length L2 is less than 1 / 4, the third section 10C is too short, the structural strength of the third section 10C is reduced, and the stability of the connection with the brush head 20 is reduced. In addition, the second section 10B is too long, and in fact, the light-transmitting panel 132 does not need to be too long, resulting in a waste of space in the length direction of the handle shell 10. If the ratio of the third length L3 to the second length L2 is greater than 1 / 4, the third section 10C is too long and the second section 10B is too short, resulting in a too short light-transmitting panel 132, which is not conducive to the provision of a large area of ​​the light-transmitting panel 132. In addition, the third section 10C squeezes the second section 10B toward the first section 10A, so that the second section 10B may be grasped by the user, resulting in the second section 10B being blocked and inconvenient for the user to observe.

[0127] If the ratio of the second length L2 to the first length L1 is less than 1 / 2, the second segment 10B is too short, resulting in a too short light-transmitting panel 132, which is not conducive to providing a large light-transmitting panel 132. If the ratio of the second length L2 to the first length L1 is greater than 3, the second segment 10B is too long, resulting in a too short first segment 10A. The second segment 10B squeezes the first segment 10A, and the second segment 10B may be grasped by the user, resulting in the second segment 10B being blocked and difficult for the user to observe.

[0128] In some embodiments, the third length L3 is no less than 10 mm, so that the first section 10A is long enough and has sufficient structural strength to support the second section 10B. The second length L2 is no less than 30 mm, so that the second section 10B is long enough to provide a sufficiently large button cap 131 and a light-transmitting panel 132. The first length L1 is no less than 40 mm, so that the grip section 1115 is long enough for the user to hold and prevent the user from holding the second section 10B. The total length of the handle shell 10 is no less than 100 mm, so that the lengths of the first section 10A, the second section 10B, and the third section 10C are appropriately distributed, so that the first section 10A and the second section 10B are located in the upper half of the handle shell 10, facilitating the connection between the first section 10A and the brush head 20 and allowing the user to observe the second section 10B. The third section 10C is located in the lower half of the handle shell 10, having sufficient length for the user to achieve a stable grip.

[0129] In some embodiments, the outer surface of the second housing 11B smoothly transitions with the outer surfaces of the first and third housings 11A, 11C. This prevents the outer surface of the second housing 11B from being uncomfortable to touch at the junction with the first and third housings 11A, 11C. Furthermore, it prevents the outer surface of the second housing 11B from being uncomfortable to touch at the junction with the first and third housings 11A, 11C, thereby preventing dirt from accumulating in the outer surface of the second housing 11B or the junction with the first and third housings 11A, 11C.

[0130] Referring to FIG. 4 , in some embodiments, the third segment 10C is positioned near the brush head 20 of the electric toothbrush 100, while the first segment 10A is positioned away from the brush head 20. The first length L1 of the third segment 10C is less than the second length L2 of the second segment 10B, and the second length L2 of the second segment 10B is less than the third length L3 of the first segment 10A. This ensures that the lengths of the third segment 10C, the second segment 10B, and the first segment 10A are appropriately distributed. The third segment 10C and the second segment 10B are positioned in the upper half of the handle housing 10, facilitating connection between the third segment 10C and the brush head 20 and allowing the user to easily view the light-transmitting panel 132 on the second segment 10B. Furthermore, the first segment 10A is positioned in the lower half of the handle housing 10, providing sufficient length for the user to securely hold the brush.

[0131] In some embodiments, the first length L1 of the third segment 10C is no less than 10 mm. This ensures that the third segment 10C is long enough to provide sufficient structural strength to support the second segment 10B and connect to the brush head 20. The second length L2 of the second segment 10B is no less than 30 mm, ensuring that the second segment 10B is long enough to accommodate a sufficiently large light-transmitting panel 132. The third length L3 of the first segment 10A is no less than 40 mm, ensuring that the grip section 1115 is long enough for the user to grip and prevent the user from gripping the second segment 10B. Furthermore, the overall length of the handle housing 10 is greater than 100 mm. This ensures that the lengths of the third segment 10C, second segment 10B, and first segment 10A are appropriately distributed, allowing the third segment 10C and second segment 10B to be located in the upper half of the handle housing 10, facilitating connection between the third segment 10C and the brush head 20 and allowing the user to easily view the light-transmitting panel 132 of the second segment 10B. Furthermore, the first segment 10A is located in the lower half of the handle housing 10, providing sufficient length for the user to maintain a stable grip.

[0132] Referring to Figures 2 and 10 , the electric toothbrush 100 further includes a bottom cover 130 disposed at the bottom end of the handle housing 10. The bottom end of the handle housing 10 has an installation opening 10b that communicates with the installation cavity 10a. The movement 30 can be installed into the installation cavity 10a of the handle housing 10 through the installation opening 10b. Therefore, the handle housing 10 also protects the movement 30 installed therein.

[0133] 11 , the core 30 serves as a power component for realizing the brushing function of the electric toothbrush 100. The core 30 may include a bracket 34, a battery 32, a motor 33, a circuit board 31 and other components.

[0134] The bracket 34 is fixedly connected to the inner wall of the handle housing 10 and is used to support components such as the battery 32 , the motor 33 and the circuit board 31 .

[0135] The battery 32 is used to power the motor 33 and the circuit board 31. The battery 32 can be a rechargeable battery 32. When the battery 32 is exhausted, the battery 32 can be charged by an external power source under the control of the circuit board 31, thereby achieving sustainable use of the electric toothbrush 100.

[0136] The output shaft 331 of the motor 33 passes through the outside of the handle shell 10 and is connected to the brush head 20. Under the control of the circuit board 31, the high-frequency vibration energy of the motor 33 when working is transmitted to the brush head 20 through the output shaft 331. When the brush head 20 acts on the user's mouth, it can realize the cleaning function of the user's mouth.

[0137] Please refer to Figure 11. For example, the motor 33 and the battery 32 can be arranged along the length direction of the handle shell 10, and along the length direction of the handle shell 10, the motor 33 is arranged closer to the brush head 20 than the battery 32. That is, along the length direction of the handle shell 10, after the brush head 20 is installed on the output shaft 331 of the motor 33, the main part of the motor 33 (the parts of the motor 33 other than the output shaft 331) is located between the brush head 20 and the battery 32. At this time, the axial direction of the motor 33 is parallel to the axial direction of the battery 32, and both are parallel to the length direction of the handle shell 10, and the end of the motor 33 away from the brush head 20 is arranged opposite to the end of the battery 32 close to the brush head 20.

[0138] In this way, on the one hand, the motor 33 is closer to the brush head 20 than the battery 32, which is convenient for connection with the brush head 20; on the other hand, the motor 33 and the battery 32 are coaxially arranged along the length direction 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 long and cylindrical. In this way, the motor 33 and the battery 32 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 it stably.

[0139] The circuit board 31 is electrically connected to electronic components such as the battery 32 and the motor 33, and is used to control these components to implement the required control functions of the electric toothbrush 100. The required functions of the electric toothbrush 100 include, but are not limited to, charging and discharging the battery 32, adjusting the brushing mode, detecting brushing parameters during brushing, communicating with external terminals, and displaying functions, and the like, which are not exhaustive here.

[0140] For example, the electric toothbrush 100 has a charge and discharge function for the battery 32. The circuit board 31 can control the discharge of the battery 32 so that the battery 32 can power the circuit board 31 and electronic components such as the motor 33. As shown in Figure 10, the electric toothbrush 100 may also include a charging unit 50. The circuit board 31 is electrically connected to the charging unit 50. When the charging unit 50 is connected to an external power source, the circuit board 31 charges the battery 32 through the charging unit 50.

[0141] For another example, the electric toothbrush 100 has a brushing mode adjustment function. The circuit board 31 can control at least one of the vibration frequency and vibration amplitude of the motor 33 to control the electric toothbrush 100 to operate in different brushing modes. Exemplary brushing modes include a gentle mode, a moderate mode, and a strong mode. The gentle mode, the moderate mode, and the strong mode each correspond to at least one of the vibration frequency and vibration amplitude increasing in sequence.

[0142] For another example, the electric toothbrush 100 has a function of detecting brushing parameters during the brushing process. For example, the electric toothbrush 100 can have an overpressure detection function. The electric toothbrush 100 can further include a pressure sensor (not shown in the figure) and an overpressure reminder component (the overpressure reminder component can be, for example, the display light source 36 shown in Figures 2-3 and 5). The pressure sensor and the overpressure reminder component are both electrically connected to the circuit board 31. The overpressure sensor is used to detect the force exerted by the teeth on the brush head 20 during brushing. When the force is greater than the preset pressure, the circuit board 31 controls the overpressure reminder component to give a corresponding prompt to remind the user that the brushing force is too strong at this time.

[0143] 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 component such as a Bluetooth module or a Fi-Wi module, or a wired communication component such as a Type-C interface, etc. The circuit board 31 controls the wireless communication component or the wired communication component to communicate with the external terminal.

[0144] For another example, the electric toothbrush 100 has a display function, and the electric toothbrush 100 may further include a display light source 36, which may include a display screen or lamp beads. The circuit board 31 controls the display screen or lamp beads to achieve corresponding display functions, such as displaying overvoltage warning information.

[0145] Therefore, when the electric toothbrush 100 is required to have one or more of the above functions, a large number of electronic components need to be configured on the circuit board 31 to realize the corresponding control functions. However, the circuit board 31 needs to be set in the mounting cavity 10a. Therefore, the area of ​​the circuit board 31 where electronic components can be set is limited by the size of the mounting cavity 10a. Specifically, the length of the circuit board 31 is limited by the length of the mounting cavity 10a, and the width of the circuit board 31 is limited by the diameter of the mounting cavity 10a. In order to avoid components such as the bracket 34, the battery 32 and the motor 33, when the mounting cavity 10a is cylindrical, the circuit board 31 cannot be located on the maximum mounting surface of the mounting cavity 10a, so the width of the circuit board 31 is further limited.

[0146] Referring to Figures 10-11, to address the issue of limited area for the circuit board 31, the circuit board 31 can be extended along the length of the handle housing 10, giving the circuit board 31 an elongated shape. In other words, by increasing the length of the circuit board 31, the area available for mounting electronic components on the circuit board 31 is expanded. However, simply increasing the length of the circuit board 31 inevitably increases the length of the handle housing 10, resulting in a longer overall length of the electric toothbrush 100. Even after a user grasps the handle housing 10, a long portion of the bottom of the handle housing 10 still extends beyond the user's hand, making it inconvenient for the user to use and carry the electric toothbrush 100.

[0147] Therefore, how to shorten the overall length of the electric toothbrush 100 while ensuring the required control functions of the electric toothbrush 100 has become a technical problem to be solved in this embodiment. In order to solve this technical problem, in this embodiment, a bottom cover 130 is provided, and the bottom cover 130 is fixedly connected to at least one of the handle shell 10 and the bracket 34, so that the bottom cover 130 is stably installed on at least one of the handle shell 10 and the bracket 34, and the bottom cover 130 covers the mounting opening 10b of the mounting cavity 10a. On the one hand, it prevents the movement 30 from falling out of the mounting opening 10b. On the other hand, the bottom cover 130 can seal the mounting opening 10b to prevent liquid or water vapor from entering the mounting cavity 10a and affecting the electronic components on the circuit board 31.

[0148] Please refer to Figures 11-14. More importantly, the bottom cover 130 has a accommodating cavity 30a connected to the installation cavity 10a, and the circuit board 31 partially extends into the accommodating cavity 30a. In this way, the length of the circuit board 31 can be increased, and the area of ​​the circuit board 31 can be increased, while the length of the handle shell 10 remains unchanged, that is, the overall length of the electric toothbrush 100 remains unchanged. More electronic devices can be arranged on the circuit board 31 to achieve more control functions. In other words, on the basis of having the same control function, since the circuit board 31 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.

[0149] Referring to Figures 11 and 14-15 , in some embodiments, the bracket 34 includes a battery housing 341, within which the battery 32 is mounted. Specifically, the battery housing 341 is used to house the battery 32. The bottom of the battery housing 32 is spaced apart from and opposite to the bottom cover 130. The bottom of the battery housing 341 is the end of the battery housing 341 facing away from the motor 33. The circuit board 31 is at least installed on the outer surface of the battery compartment shell 341. It can also be understood that the circuit board 31 is overlapped with the battery compartment shell 341 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 of the handle shell 10, the circuit board 31 extends toward the bottom cover 130 beyond the bottom end 3411 of the battery compartment shell 341. In this way, the circuit board 31 can extend into the accommodating cavity 30a, and then the area of ​​the circuit board 31 is increased by increasing the length of the circuit board 31. On this basis, since the bottom of the battery compartment shell 341 is opposite to the bottom cover 130 and is spaced apart, in the process of the bottom cover 130 sealing the installation opening 10b, that is, the process of the circuit board 31 extending into the accommodating cavity 30a, the battery compartment shell 341 can be avoided from interfering with the installation of the bottom cover 130, thereby preventing the bottom cover 130 from being unable to be installed normally.

[0150] Referring to Figures 14 and 15 , further, along the length direction of the handle housing 10, the portion of the circuit board 31 extending toward the bottom cover 130 beyond the bottom end 3411 of the battery compartment housing 341 is suspended. To further ensure the installation stability of this suspended portion, the bracket 34 also includes a support plate 343. The support plate 343 extends from the bottom end 3411 of the battery compartment housing 341 toward the bottom cover 130 to support the circuit board 31. Specifically, the support plate 343 is used to support the suspended portion of the circuit board 31 beyond the bottom end 3411 of the battery compartment housing 341, thereby preventing the suspended portion of the circuit board 31 from being too long and easily broken. This is especially true when a large number of electronic components are disposed on the surface of the suspended portion, as the suspended portion would be easily broken due to the heavy weight it carries. Therefore, supporting the suspended portion with the support plate 343 not only improves the installation stability of the suspended portion on the bracket 34, but also increases the service life of the circuit board 31.

[0151] Please refer to Figure 11 or Figure 14. Furthermore, the bracket 34 also includes a motor housing 342, which is connected to the end of the battery housing 341 away from the bottom cover 130 along the length direction of the handle shell 10, that is, along the length direction of the handle shell 10, the battery housing 341 is located between the bottom cover 130 and the motor housing 342, and the motor 33 is installed in the motor housing 342. In this way, by designing the motor housing 342 to be closer to the brush head 20 relative to the battery housing 341, after the motor 33 is installed in the motor housing 342, the distance between the motor 33 and the brush head 20 is shorter, which facilitates the connection between the motor 33 and the brush head 20.

[0152] Among them, the display light source 36 is arranged on the outer surface of the motor compartment housing 342, that is, the display light source 36 is overlapped with the motor compartment housing 342 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 light source 36 and the circuit board 31 are located on the same side of the bracket 34, so that the circuit board 31 and the display light source 36 are installed corresponding to the battery compartment housing 341 and the motor compartment housing 342 respectively. The installation of the circuit board 31 and the display light source 36 on the bracket 34 is more compact, which is conducive to reducing the size of the movement 30. Furthermore, along the length direction of the handle shell 10, the circuit board 31 extends to the outer surface of the motor compartment housing 342. In this way, the length of the circuit board 31 can be further increased. Under the premise that the length of the handle shell 10 remains unchanged, the area of ​​the circuit board 31 can be further increased. In other words, under the premise that the overall length of the circuit board 31 remains unchanged, since the circuit board 31 extends to the outer surface of the motor compartment housing 342 instead of extending to the outside of the bottom cover 130, the length of the handle shell 10 can be shortened.

[0153] Referring to FIG. 13 , in some embodiments, the handle housing 10 includes a button cap 131 connected to the circuit board 31. A user can operate the button cap 131 to trigger a corresponding control instruction, which is then sent to the circuit board 31, causing the circuit board 31 to control other electronic components to implement corresponding control functions. For example, operating the button cap 131 can adjust the brushing mode. When the button cap 131 is operated, the circuit board 31 can control at least one of the vibration frequency and vibration amplitude of the motor 33 according to the control instruction issued by the button cap 131, thereby controlling the electric toothbrush 100 to operate in different brushing modes.

[0154] Please refer to Figures 12 and 15. Furthermore, 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 34 has a front side surface 34a and a rear side surface 34b that are arranged opposite to each other. The front side surface 34a of the bracket 34 is arranged toward the button cap 131, that is, the surface of the bracket 34 facing the button cap 131 is the front side surface 34a, and the circuit board 31 is installed on the front side surface 34a of the bracket 34; the surface of the bracket 34 facing away from the button cap 131 is the rear side surface 34b. The front side surface 34a of the bracket 34 is closer to the center dividing surface of the handle shell 10 than the rear side surface 34b, so that the circuit board 31 is closer to the center dividing surface of the handle shell 10. Near the center dividing surface of the handle shell 10, for example, the mounting cavity 10a is cylindrical, therefore, in the front-to-back direction, the position of the center dividing surface of the handle shell 10 is actually the maximum mounting surface in the mounting cavity 10a, and the circuit board 31 is closer to the center dividing surface of the handle shell 10, that is, closer to the maximum mounting surface of the mounting cavity 10a, therefore, the circuit board 31 can have a larger width, and when the number of electronic components installed on the circuit board 31 is fixed, more electronic components can be installed along the width direction of the circuit board 31, therefore, the length of the circuit board 31 can be shortened, and then the length of the handle shell 10 and the electric toothbrush 100 can be shortened.

[0155] Continuing to refer to FIG12 , further, the output shaft 331 of the motor 33 is located between the mid-plane and the rear side surface 34b, that is, the motor housing 342 and the motor 33 are eccentrically arranged relative to the handle housing 10, and the motor housing 342 and the motor 33 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 32 and the motor 33 are coaxially installed, the battery housing 341 and the battery 32 are also arranged closer to the rear side of the handle housing 10. In this way, the circuit board 31 on the surface of the motor housing 342 and the battery housing 341 can be arranged closer to the mid-plane of the handle housing 10, that is, closer to the maximum installation surface of the installation cavity 10a, so that the circuit board 31 can have a larger width, which is more conducive to shortening the length of the circuit board 31, and thus shortening the length of the handle housing 10 and the electric toothbrush 100.

[0156] Referring to Figures 14-15, in some embodiments, the circuit board 31 includes an extended section 311 and an external section 312 connected along the length. The extended section 311 extends into the accommodating cavity 30a and represents the portion of the circuit board 31 that extends into the accommodating cavity 30a. The external section 312 is located outside the accommodating cavity 30a and within the mounting cavity 10a and represents the portion of the circuit board 31 that does not extend into the accommodating cavity 30a. Along the width direction perpendicular to the length of the handle housing 10, the width of the external section 312 is greater than the width of the extended section 311.

[0157] That is, the width of the insertion section 311 is smaller, and the width of the external section 312 is larger. In this way, when the bottom cover 130 is used to cover the installation opening 10b, the insertion section 311 can be more easily inserted into the accommodating cavity 30a, and will not hit the bottom cover 130, causing the bottom cover 130 to be unable to be installed smoothly. After the bottom cover 130 is installed, the insertion section 311 and the cavity wall of the accommodating cavity 30a can also be spaced apart to prevent the vibration of the movement 30 from being transmitted to the bottom cover 130 through the circuit board 31 when the motor 33 is working, thereby reducing the risk of the bottom cover 130 loosening from the handle shell 10 due to vibration. Furthermore, the width of the external section 312 is larger, and more electronic components can be installed along the width direction of the circuit board 31. Therefore, the length of the circuit board 31 can be shortened, and the length of the handle shell 10 and the electric toothbrush 100 can be shortened.

[0158] Please refer to Figures 2-3. In some embodiments, 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 it should be noted that common metal machining processes include stretching and extrusion molding, and the metal shell 11 is formed through 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 embodiment of the present application, by allowing the circuit board 31 to extend into the accommodating cavity 30a of the bottom cover 130, 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 form. 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.

[0159] Please continue to refer to Figures 2-3. Furthermore, the plastic lining 12 is fixed to the inner wall of the metal shell 11, and the plastic lining 12 is molded with a first connecting structure 121, and the bracket 34 is connected to the first connecting structure 121, so that the movement 30 is fixed in the handle shell 10. Since the metal shell 11 is formed by stretching or extrusion, it is difficult to mold the first connecting structure 121 connected to the bracket 34 directly on the inner wall of the metal shell 11. If the first connecting structure 121 is molded 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 mold the first connecting structure 121 connected to the bracket 34 through the injection molding process, and connect it to the bracket 34 through the first connecting structure 121, so as to achieve fixed installation of the movement 30 in the handle shell 10. Moreover, the shorter metal shell 11 and plastic lining 12 can achieve a more stable installation with the movement 30.

[0160] Please refer to Figures 15-16. In some embodiments, the bottom cover 130 includes a bottom plate 1301 and a cylindrical portion 1302. The bottom plate 1301 is plate-shaped and is used to cover the mounting opening 10b. The cylindrical portion 1302 is cylindrical and is arranged on the surface of the bottom plate 1301 facing the mounting cavity 10a, and has a accommodating cavity 30a. The end of the cylindrical portion 1302 facing away from the bottom plate 1301 is configured with an insertion port 30b. The cylindrical portion 1302 has an accommodating cavity 30a due to its cylindrical shape. The end of the accommodating cavity 30a away from the movement 30 is covered by the bottom plate 1301, and the end of the accommodating cavity 30a close to the movement 30 is configured with an insertion port 30b, so that the circuit board 31 can extend into the accommodating cavity 30a through the insertion port 30b, thereby shortening the length of the handle shell 10.

[0161] Referring to FIG. 14 , the plastic liner 12 is also cylindrical and includes a sealing section 127 near the bottom plate 1301 and a connecting section 128 for connecting to the bracket 34. It is understood that the sealing section 127 is also cylindrical, and the cylindrical portion 1302 is disposed through the cylindrical sealing section 127 and is sealedly connected to the sealing section 127. For example, the cylindrical portion 1302 can also be made of plastic, and since the sealing section 127 is also made of plastic, a good seal can be achieved between the cylindrical portion 1302 and the sealing section 127 through an interference fit.

[0162] Referring to Figure 14 , further, the thickness of the sealing section 127 is thinner than the thickness of other portions of the plastic liner 12 (i.e., the connecting section 128). Since the sealing section 127 is used to mate with the cylindrical portion 1302, by reducing the thickness of the sealing section 127, the outer diameter of the cylindrical portion 1302 can be increased. Accordingly, the inner diameter of the accommodating cavity 30a of the cylindrical portion 1302 can also be increased, and the insertion section 311 extending into the accommodating cavity 30a can have a greater width, thereby enabling the integration of more electronic components and further facilitating a reduction in the length of the handle housing 10. Furthermore, by reducing the thickness of the sealing section 127 to accommodate a cylindrical portion 1302 with a larger outer diameter, the diameter of the metal housing 11 can be reduced compared to increasing the diameter of the metal housing 11 to accommodate a cylindrical portion 1302 with a larger outer diameter.

[0163] Please refer to Figures 14 and 16. 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 135 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 135. The step surface of the first step structure 135 is also the end surface of the bottom end of the plastic liner 12.

[0164] The bottom plate 1301 includes an annular protrusion 1311 that protrudes relative to the cylindrical portion 1302. Specifically, the bottom plate 1301 protrudes from the outer circumferential surface of the cylindrical portion 1302 in the radial direction of the cylindrical portion 1302, so that a second step structure 136 is formed between the annular protrusion 1311 and the cylindrical portion 1302. The step surface of the second step structure 136 is also an annular surface of the annular protrusion 1311 facing the installation cavity 10a. The second step structure 136 cooperates with the first step structure 135 to ensure that the bottom plate 1301 is at least partially located within the metal shell 11. It is understood that the bottom plate 1301 can also be completely contained within the metal shell 11. In this way, the length of the handle housing 10 can be further shortened compared to when the bottom plate 1301 is completely exposed outside the metal shell 11.

[0165] Please continue to refer to Figure 14. In some embodiments, the outer side wall of the cylindrical portion 1302 is sealed 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 provided on the inner wall of the metal shell 11. The plastic liner 12 includes a sealing section 127. The cylindrical portion 1302 is passed through the cylindrical sealing section 127 and is sealed to the sealing section 127. Exemplarily, the cylindrical portion 1302 can also be made of plastic material. In addition, the sealing section 127 is also made of plastic material. Therefore, a better seal can be achieved between the cylindrical portion 1302 and the sealing section 127 through an 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 1302 can be sealed to the plastic inner wall or the metal inner wall of the handle shell 10.

[0166] Referring to Figure 11 or Figure 14, in some embodiments, the bottom cover 130 further includes at least one of a first latch 137 and a second latch 344. For example, the first latch 137 extends from at least one of the bottom plate 1301 and the cylindrical portion 1302 toward the bracket 34. The bracket 34 includes at least the other of the first latch 137 and the second latch 344. For example, the second latch 344 extends from the bottom end 3411 of the battery compartment housing 341 toward the bottom plate 1301, and the second latch 344 snaps into engagement with the first latch 137. For example, the first latch 137 includes a hook, and the second latch 344 includes a slot, into which the hook snaps. In this way, based on the sealed fit between the cylindrical portion 1302 and the handle housing 10, the bottom cover 130 further snaps into engagement with the bracket 34, thereby improving the connection stability between the bottom cover 130, the handle housing 10, and the movement 30.

[0167] As shown in Figure 11, in some embodiments, the buckle group formed by the first buckle 137 and the second buckle 344 includes two groups, and the two groups of buckle structures are opposite to each other and spaced apart. For example, the two groups of buckle structures are axially symmetrical about the central axis of the handle shell 10. In this way, the connection stability between the bottom cover 130 and the bracket 34 can be further improved, and the risk of the bottom cover 130 detaching from the bracket 34 can be reduced.

[0168] Furthermore, as shown in FIG14 , the portion of the circuit board 31 that extends into the accommodating cavity 30a is located on one side of the integral structure formed by the two snap-fit ​​groups and is spaced apart from the snap-fit ​​structure. Thus, during the process of the circuit board 31 extending into the accommodating cavity 30a, the first snap-fit ​​member 137 and the second snap-fit ​​member 344 also engage in a snap-fitting manner. However, because the circuit board 31 and the snap-fit ​​structure are spaced apart from each other, the process of the circuit board 31 extending into the accommodating cavity 30a is not interfered with by the snap-fit ​​structure and can be smoothly inserted into the accommodating cavity 30a. The snap-fitting process of the first snap-fit ​​member 137 and the second snap-fit ​​member 344 is also not interfered with by the circuit board 31, allowing for a smooth snap-fitting manner.

[0169] Referring to Figures 14 and 16 , in some embodiments, the outer wall of the cylindrical portion 1302 has an annular glue-filling groove 32a. This groove 32a is filled with glue 139, which bonds to the inner wall of the handle housing 10, such as the inner wall of the sealing section 127. This adhesive 139 seals various circumferential locations of the outer wall of the bottom cover 130 with various circumferential locations of the inner wall of the sealing section 127, further improving the sealing performance between the bottom cover 130 and the sealing section 127. This prevents liquid or moisture from entering the mounting cavity 10a through the mounting opening 10b and potentially affecting the electronic components on the circuit board 31. Furthermore, during glue dispensing, increasing the amount of glue 139 increases the bonding area between the outer wall of the bottom cover 130 and the inner wall of the sealing section 127, further improving the sealing performance between the bottom cover 130 and the sealing section 127.

[0170] Please refer to Figures 14-15. In some embodiments, the electric toothbrush 100 also includes the aforementioned charging component 50, which is arranged on the handle shell 10, passes through the handle shell 10 and is electrically connected to the circuit board 31. In this way, the length of the bottom cover 130 that needs to be increased due to the provision of the charging component 50 is eliminated, and the distance between the bottom cover 130 and the bottom end 3411 of the battery compartment shell 341 can be reduced, thereby further shortening the length of the handle shell 10. If the charging component 50 is provided on the bottom cover 130, since the charging component 50 has a certain length, the handle shell 10 needs to increase in length accordingly to cover the outer periphery of the bottom cover 130 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 charging pins provided in the charging base.

[0171] Referring to Figures 14 and 16, the plastic liner 12 includes a cylindrical sealing section 127. The sealing section 127 is disposed near the mounting opening 10b at the bottom of the handle shell 10. The sealing section 127 is configured to cooperate with the bottom cover 130 to achieve a sealed connection between the bottom cover 130 and the handle shell 10. The plastic liner 12 is a plastic part, and therefore, the sealing section 127 is also a plastic part. By providing the plastic sealing section 127, the sealing section 127 can be easily molded into a shape or connector that cooperates with the bottom cover 130 through an injection molding process. Therefore, a seal between the bottom cover 130 and the handle shell 10 can be achieved with a simpler process and lower manufacturing costs.

[0172] In contrast, if sealing section 127 is not provided, a shape or connector that mates with bottom cover 130 must be formed on the inner wall of metal shell 11 through metal machining or welding. Common metal machining processes include stretching and extrusion, and metal shell 11 is formed through these processes. Compared to the plastic liner 12 (including sealing section 127), which can be formed through injection molding, forming a shape or connector on metal shell 11 that mates with bottom cover 130 is more difficult.

[0173] Please refer to Figure 14. The bottom cover 130 covers the mounting opening 10b. On the one hand, it prevents the movement 30 from falling out of the mounting opening 10b. On the other hand, the bottom cover 130 is at least partially penetrated into the sealing section 127 to achieve a sealed connection between the bottom cover 130 and the sealing section 127. For example, the bottom cover 130 is also a plastic part. By at least partially penetrating the bottom cover 130 into the lining and making an interference fit between the bottom cover 130 and the sealing section 127, a sealed connection between the bottom cover 130 and the sealing section 127 is achieved. For another example, a sealing member 140 is provided between the outer peripheral wall of the bottom cover 130 and the inner peripheral wall of the sealing section 127. The sealing member 140 is used to seal the gap between the bottom cover 130 and the sealing section 127, thereby achieving a sealed connection between the bottom cover 130 and the sealing section 127. In this way, liquid or water vapor can be prevented from entering the mounting cavity 10a and affecting the electronic components on the circuit board 31.

[0174] In this embodiment, a plastic lining 12 is provided on the inner wall of the metal shell 11. On the one hand, compared with the movement 30 being directly connected to the inner wall of the metal shell 11, by providing the plastic lining 12, a first connecting structure 121 connected to the movement 30 can be formed on the plastic lining 12 through an injection molding process. That is, the first connecting structure 121 for connecting to the movement 30 can be easily molded through an injection molding process. Therefore, a fixed connection between the movement 30 and the handle shell 10 can be achieved with a simpler process and lower manufacturing cost.

[0175] Another more important aspect is that the plastic liner 12 includes a cylindrical sealing section 127, which is used to cooperate with the bottom cover 130 to achieve a sealed connection between the bottom cover 130 and the handle shell 10. Since the plastic liner 12 is a plastic part, the sealing section 127 is also a plastic part. By providing the plastic sealing section 127, a shape or connector that cooperates with the bottom cover 130 can be formed in the sealing section 127 through an injection molding process. Therefore, the seal between the bottom cover 130 and the handle shell 10 can be achieved with a simpler process and lower manufacturing cost. Furthermore, by providing a sealing member 140 between the bottom cover 130 and the sealing section 127, the sealing performance between the bottom cover 130 and the sealing section 127 can be further improved, while the connection stability of the bottom cover 130 on the sealing section 127 can be improved.

[0176] Referring to FIG. 14 , in some embodiments, the outer wall of the bottom cover 130 has an annular glue-filling groove 32a. The sealing member 140 includes glue 139 filled in the glue-filling groove 32a. The glue 139 is bonded to the inner wall of the sealing section 127. Thus, the glue 139 seals various circumferential locations of the outer wall of the bottom cover 130 with various circumferential locations of the inner wall of the sealing section 127. This further improves the sealing performance between the bottom cover 130 and the sealing section 127, preventing liquid or moisture from entering the mounting cavity 10a through the mounting opening 10b and potentially affecting the electronic components on the circuit board 31. Furthermore, during glue dispensing, the amount of glue can be increased to increase the bonding area between the glue 139 and the outer wall of the bottom cover 130 and the inner wall of the sealing section 127, further improving the sealing performance between the bottom cover 130 and the sealing section 127.

[0177] Referring to FIG. 14 , in some other embodiments, the outer peripheral wall of the bottom cover 130 has an annular groove 32 b in an annular configuration. The sealing member 140 includes a sealing ring 138 partially disposed within the annular groove 32 b. The sealing ring 138 can be an elastic sealing ring 138, such as a silicone ring or a rubber ring. The sealing ring 138 has an interference fit with the inner peripheral wall of the sealing section 127. It is understood that the sealing ring 138 is squeezed by the inner peripheral wall of the sealing section 127 and also has an interference fit with the groove wall of the annular groove 32 b. In this way, the sealing ring 138 seals the outer peripheral wall of the bottom cover 130 at various circumferential locations with the inner peripheral wall of the sealing section 127. This further improves the sealing performance between the bottom cover 130 and the sealing section 127, preventing liquid or moisture from entering the mounting cavity 10 a through the mounting opening 10 b and affecting the electronic components on the circuit board 31. Moreover, compared with sealing by means of the adhesive 139 , sealing by means of the sealing ring 138 can save on the glue dispensing process and can also avoid the risk of the adhesive overflowing onto the surface of the handle shell 10 .

[0178] Referring to FIG. 14 , in some embodiments, the outer peripheral wall of the bottom cover 130 includes both a glue-filling groove 32a for filling with glue 139 and an annular groove 32b containing a sealing ring 138. This achieves a dual seal between the gap between the bottom cover 130 and the sealing section 127, further enhancing sealing performance. Furthermore, the glue-filling groove 32a is closer to the movement 30 than the annular groove 32b. That is, the glue-filling groove 32a is closer to the interior of the mounting cavity 10a than the annular groove 32b. Thus, when the bottom cover 130 is assembled, glue 139 overflowing from the glue-filling groove 32a is blocked by the sealing ring 138 and prevented from flowing through the sealing ring 138 onto the outer surface of the handle housing 10. Furthermore, the glue 139 overflowing from the glue-filling groove 32a increases the bonding area with the outer peripheral wall of the bottom cover 130 and the inner peripheral wall of the sealing ring 138, further enhancing the sealing performance between the bottom cover 130 and the sealing section 127.

[0179] Please refer to Figure 14. In some embodiments, at least one of the metal shell 11, the movement 30 and the sealing section 127 includes a second fastener 344, and the second fastener 344 is arranged at the bottom end of the bracket 34. The bottom cover 130 includes a first fastener 137. The second fastener 344 and the first fastener 137 are snap-fitted along the length direction of the handle shell 10. In this way, the connection stability between the bottom cover 130 and the bracket 34 is improved. In addition, the bracket 34 is fixed on the plastic lining 12. Therefore, the connection stability among the bottom cover 130, the movement 30 and the handle shell 10 can be improved, thereby preventing the bottom cover 130 from falling off relative to the handle shell 10.

[0180] It is understood that the metal housing 11 or the sealing section 127 may also include a second latch 344. For example, the sealing section 127 may include the second latch 344, and the second latch 344 may engage with the first latch 137. This may improve the connection stability between the bottom cover 130 and the sealing section 127. Compared to providing the second latch 344 on the metal housing 11, since the metal housing 11 is made of metal, while the bracket 34 and the sealing section 127 are made of plastic or a plastic material, it is easier to mold the second latch 344 on the bracket 34 and the sealing section 127.

[0181] In addition, through the position design, when the second fastener 344 and the first fastener 137 are just snapped together, the glue 139 and the sealing ring 138 just reach the assembly position. In this way, while the second fastener 344 and the first fastener 137 are snapped together, the sealed assembly of the bottom cover 130 and the sealing section 127 is achieved, and the assembly process of the bottom cover 130 is more efficient.

[0182] It can be understood that when the cylindrical portion 1302 is directly fixed to the inner wall of the sealing section 127 by means of glue 139 or a sealing ring 138, the second fastener 344 and the first fastener 137 may not be provided, thereby eliminating the length of the fastener structure formed by the second fastener 344 and the first fastener 137, thereby shortening the distance from the bottom cover 130 to the bracket 34, and thus shortening the overall length of the handle shell 10.

[0183] In some embodiments, the plastic lining 12 is formed on the inner wall of the metal shell 11 by an injection molding process, that is, the plastic lining 12 is arranged close to the inner wall of the metal shell 11, so that the sealing section 127 is sealed and connected to the metal shell 11. In this way, liquid or water vapor can be prevented from entering the gap between the metal shell 11 and the plastic lining 12, and water can be prevented from entering the gap between the metal shell 11 and the plastic lining 12, causing the gap between the metal shell 11 and the plastic lining 12 to accumulate dirt and grime, and liquid or water vapor can be prevented from entering the installation cavity 10a through the gap between the metal shell 11 and the plastic lining 12, thereby affecting the electronic components in the installation cavity 10a.

[0184] Referring to Figures 14-16 , in some embodiments, the bottom cover 130 includes a bottom plate 1301 and a cylindrical portion 1302. The bottom plate 1301 is plate-shaped and serves to seal the mounting opening 10b. The cylindrical portion 1302 is cylindrical and disposed on the surface of the bottom plate 1301 facing the mounting cavity 10a. The cylindrical portion 1302 extends through the sealing section 127, and the sealing member 140 is disposed between the cylindrical portion 1302 and the sealing section 127, thereby providing a sealed connection between the cylindrical portion 1302 and the sealing section 127.

[0185] Please refer to Figure 14. Furthermore, the metal shell 11 includes a protruding section 114 that protrudes relative to the bottom of the sealing section 127 along the length direction of the handle shell 10. That is, the bottom end of the sealing section 127 is retracted into the mounting cavity 10a relative to the bottom end of the metal shell 11, so that a first step structure 135 is formed between the sealing section 127 and the protruding section 114. The step surface of the first step structure 135 is also the end surface of the bottom end of the sealing section 127. The bottom plate 1301 includes an annular protrusion 1311 that protrudes relative to the cylindrical portion 1302. Specifically, the bottom plate 1301 protrudes from the outer circumferential surface of the cylindrical portion 1302 in the radial direction of the cylindrical portion 1302, so that a second step structure 136 is formed between the annular protrusion 1311 and the cylindrical portion 1302. The step surface of the second step structure 136 is also an annular surface of the annular protrusion 1311 facing the installation cavity 10a. The second step structure 136 cooperates with the first step structure 135 to allow the bottom plate 1301 to be at least partially embedded in the protruding section 114. It is understood that the bottom plate 1301 can also be completely accommodated in the protruding section 114. In this way, compared to when the bottom plate 1301 is completely exposed outside the metal shell 11, the overall length of the handle housing 10 can be shortened.

[0186] Please continue to refer to Figure 14. In some embodiments, glue 139 is also provided between the outer peripheral wall of the bottom plate 1301 and the inner peripheral wall of the protruding section 114. The glue 139 is bonded to the peripheral side wall of the bottom plate 1301 and the inner peripheral wall of the protruding section 114. In this way, at the installation opening 10b, the bottom plate 1301 is sealed with the inner periphery of the protruding section 114 through the glue 139. In addition, the sealing member 140 seals the gap between the cylindrical portion 1302 and the sealing section 127, thereby realizing multiple seals between the bottom cover 130 and the handle shell 10, thereby improving the sealing performance between the bottom cover 130 and the handle shell 10.

[0187] In some embodiments, at least one of glue 139 and a sealing ring 138 is provided between the step surface of the first step structure 135 and the step surface of the second step structure 136. In this way, another sealing structure is added between the step surface of the first step structure 135 and the step surface of the second step structure 136, thereby realizing multiple sealing between the bottom cover 130 and the handle shell 10, and further improving the sealing performance between the bottom cover 130 and the handle shell 10.

[0188] In some embodiments, the inner circumferential wall of the sealing section 127 and the inner circumferential wall of the protruding section 114 are both cylindrical, and the outer circumferential wall of the bottom plate 1301 and the outer circumferential wall of the cylindrical portion 1302 are both cylindrical. In this way, the bottom cover 130 and the handle shell 10 can be quickly installed without alignment, thereby improving the installation efficiency between the bottom cover 130 and the handle shell 10.

[0189] In other embodiments, the shape of the inner circumferential wall of the sealing section 127 is non-cylindrical, and the shape of the outer circumferential wall of the cylindrical portion 1302 corresponds to the shape of the inner circumferential wall of the sealing section 127. That is, the shape of the outer circumferential wall of the cylindrical portion 1302 is non-cylindrical, corresponding to the shape of the inner circumferential wall of the sealing section 127. For example, the shape of the outer circumferential wall of the cylindrical portion 1302 and the shape of the inner circumferential wall of the sealing section 127 are both elliptical. In this way, when the bottom cover 130 is installed on the handle housing 10, the shape of the outer circumferential wall of the cylindrical portion 1302 and the shape of the inner circumferential wall of the sealing section 127 are utilized for alignment and installation, thereby improving installation accuracy. For example, it can ensure that the second latch 344 is aligned with the first latch 137 and achieve a snap fit.

[0190] Similarly, in some embodiments, the shape of the inner circumferential wall of the protruding section 114 is non-cylindrical, and the shape of the outer circumferential wall of the bottom plate 1301 corresponds to the shape of the inner circumferential wall of the protruding section 114. That is, the shape of the outer circumferential wall of the bottom plate 1301 is non-cylindrical, corresponding to the shape of the inner circumferential wall of the protruding section 114. For example, the shape of the outer circumferential wall of the bottom plate 1301 and the shape of the inner circumferential wall of the protruding section 114 are both elliptical. In this way, when the bottom cover 130 is installed on the handle housing 10, the shape of the outer circumferential wall of the bottom plate 1301 and the shape of the inner circumferential wall of the protruding section 114 are utilized for alignment and installation, thereby improving installation accuracy. For example, this can ensure that the second latch 344 is aligned with the first latch 137 and achieve a snap-fit ​​fit.

[0191] Referring to FIG. 14 , in some embodiments, the plastic liner 12 further comprises a connecting section 128 , which is connected to the sealing section 127 along the length of the handle housing 10 and is located further away from the mounting opening 10b than the sealing section 127 . The connecting section 128 and the sealing section 127 together form a mounting cavity 10a that communicates with the mounting opening 10b . That is, the plastic liner 12 covers the inner wall of the metal housing 11 , and the mounting cavity 10a is defined by the plastic liner 12 . The movement 30 is mounted within the mounting cavity 10a , and the connecting section 128 is provided with a first connecting structure 121 that is connected to the movement 30 . Specifically, the bracket 34 of the movement 30 is connected to the first connecting structure 121 .

[0192] If the plastic lining 12 is not provided, the first connection structure 121 needs to be formed on the inner wall of the metal shell 11 by metal machining or welding. Common metal machining processes include stretching and extrusion molding, and the metal shell 11 is formed by the above processes. Compared with the plastic lining 12, which can be formed by injection molding the first connection structure 121, it is more difficult to manufacture the first connection structure 121 on the metal shell 11. That is, in this embodiment, by molding the first connection structure 121 on the plastic lining 12, the process is simpler and the manufacturing cost is lower.

[0193] Furthermore, the sealing section 127, the connecting section 128 and the first connecting structure 121 can be integrally formed, which not only simplifies the production process and reduces manufacturing costs, but also improves the connection stability between the connecting section 128, the sealing section 127 and the first connecting structure 121.

[0194] Referring to FIG. 14 , in some embodiments, the thickness of the sealing segment 127 is thinner than the thickness of the connecting segment 128. Since the sealing segment 127 is used to cooperate with the cylindrical portion 1302, by reducing the thickness of the sealing segment 127, the outer diameter and thickness of the cylindrical portion 1302 can be increased, allowing the cylindrical portion 1302 to have a greater thickness to define the glue-filling groove 32a and the annular groove 32b. At the same time, the glue-filling groove 32a and the annular groove 32b do not penetrate the cylindrical portion 1302 in the radial direction. This ensures that the cylindrical portion 1302 still has a certain structural strength even when at least one of the glue-filling groove 32a and the annular groove 32b is defined, thereby preventing the cylindrical portion 1302 from being easily damaged due to insufficient structural strength, which could lead to failure of the seal between the cylindrical portion 1302 and the sealing segment 127. Furthermore, by reducing the thickness of the sealing section 127 , the cylindrical portion 1302 having a larger outer diameter can be installed, which allows the metal housing 11 to have a smaller diameter than if the cylindrical portion 1302 having a larger outer diameter is installed by increasing the diameter of the metal housing 11 .

[0195] Please refer to Figure 14. Furthermore, a transition slope 1241 is provided at the connection between the sealing section 127 and the connecting section 128. The transition slope 1241 is gradually ascending from the sealing section 127 to the connecting section 128, that is, the inner diameter of the sealing section 127 is larger than the inner diameter of the connecting section 128, and the inner diameter of the sealing section 127 is gradually reduced to the inner diameter of the connecting section 128 through the transition slope 1241. In this way, in the process of installing the movement 30 into the installation cavity 10a through the installation opening 10b, the movement 30 can easily extend into the sealing section 127 with a larger inner diameter, and then the movement 30 is guided into the connecting section 128 by the guiding action of the transition slope 1241. In this way, the efficiency of installing the movement 30 into the installation cavity 10a can be improved.

[0196] Please refer to Figures 17-18. The shell wall of the metal shell 11 is provided with a translucent panel 132, which includes a plurality of micropores 1321. The micropores 1321 are filled with translucent colloid. The micropores 1321 filled with translucent colloid on one translucent panel 132 are used to produce the same indication effect; the movement 30 includes a display light source 36, and the light emitted by the display light source 36 is transmitted to the outside of the metal shell 11 through the micropores 1321 of the translucent panel 132.

[0197] In this embodiment, because the micropores 1321 in the wall of the metal shell 11 have a very small diameter, the light emitted by the display light source 36 within the metal shell 11 can be transmitted to the outside of the metal shell 11 while retaining the metallic appearance of the metal shell 11, thereby realizing a light indication function. Therefore, this application can solve the problem that existing metal handles cannot realize the light indication function of the handle while retaining the overall metallic appearance.

[0198] The specific structure of the handle housing 10 is described below in conjunction with the accompanying drawings.

[0199] The metal shell 11 is a handle housing made of metal material. Therefore, the metallic luster on its surface can make the handle have a high appearance quality and significantly improve the texture of the oral care device. The metal shell 11 can be made of one or more metals such as aluminum alloy, cobalt alloy, stainless steel, etc.

[0200] The outline of the light-transmitting panel 132 on the shell wall of the metal shell 11 can be a variety of shapes such as a circle, an ellipse, a polygon, and for example, a polygon can be a triangle, a quadrilateral, a hexagon, and the like. Designers can flexibly arrange the multiple micropores 1321 of the light-transmitting panel 132 according to specific actual needs, so that the light-transmitting panel 132 presents different patterns and enriches the display style of the light-transmitting panel 132. For example, the multiple micropores 1321 can be arranged in an array, or the multiple micropores 1321 can be randomly arranged irregularly. The embodiment of the present application does not limit the content displayed by the light-transmitting panel 132. For example, the light-transmitting panel 132 can display at least one of the current operating mode, care area, care duration, care intensity, and other information of the oral care device. A light-transmitting panel 132 is used to produce the same indication function. For example, multiple micropores 1321 on a light-transmitting panel 132 together form an indicator light, and the multiple micropores 1321 light up and go out together. One or more light-transmitting panels 132 can be set on the metal shell 11.

[0201] The diameter of a single micropore 1321 can be 0.1 mm to 0.2 mm, for example, 0.1 mm, 0.12 mm, 0.15 mm, 0.17 mm, 0.18 mm, or 0.2 mm. It should be noted that because the brush head 1 generates high-frequency vibrations when the user uses the oral care device, the user's fingers typically grip the handle housing 10 of the oral care device with force. To avoid insufficient structural strength of the handle housing 10 due to the thin wall thickness of the metal shell 11 and to facilitate the processing of the micropores 1321 on the shell wall of the metal shell 11, the wall thickness of the metal shell 11 can be 0.8 to 2 times the diameter of the micropore 1321. For example, the wall thickness of the metal shell 11 can be 0.08 mm to 0.4 mm, for example, 0.08 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, or 0.4 mm. In addition, the wall thickness of the metal shell 11 can also be 0.3mm to 0.5mm. For example, it can be 0.3mm, or 0.32mm, or 0.35mm, or 0.4mm, or 0.42mm, or 0.55mm, or 0.5mm, etc. The distance between the axial centers of two adjacent micropores 1321 is 1.5 to 3 times the diameter of the micropore 1321. Exemplarily, the distance between the axial centers of two adjacent micropores 1321 can be 0.15mm to 0.6mm, for example, it can be 0.15mm, or 0.2mm, or 0.25mm, or 0.3mm, or 0.35mm, or 0.38mm, or 0.4mm, or 0.45mm, or 0.5mm, or 0.55mm, or 0.6mm, etc. In this way, by designing the distance between the axial centers of adjacent micropores 1321 to be greater than the diameter of the micropore 1321, the surface strength of the shell wall of the metal shell 11 can be further ensured.

[0202] The micropores 1321 can be filled with a translucent colloid. The micropores 1321 on a translucent panel 132 are used to provide the same indication function. The translucent colloid prevents toothpaste stains and other contaminants from seeping into the micropores 1321 during use, causing blockage and affecting the light indication effect. It also prevents water from entering the oral care device through the micropores 1321, ensuring that the oral care device meets the highest IPX8 waterproof rating.

[0203] 19-21 , the movement 30 is disposed in the mounting cavity. The movement 30 may include a bracket 34, a circuit board 31, a display light source 36, and a battery 32. The circuit board 31 is fixed to the bracket 34, the display light source 36 is fixed to the bracket 34, and the circuit board 31 is electrically connected to the display light source 36 and the battery 32, respectively. The bracket 34 may be integrally formed by an injection molding process so that the bracket 34 has a high structural strength, thereby being able to stably support components such as the circuit board 31, the display light source 36, and the battery 32, thereby improving the overall structural stability of the movement 30. The battery 32 is used to power electronic devices such as the circuit board 31 and the display light source 36. The battery 32 may be a rechargeable battery, such as a nickel-cadmium, nickel-metal hydride, lithium-ion, lead-acid, or iron-lithium rechargeable battery. Of course, it may also be in the form of a dry cell or other forms, which is not limited in the embodiments of the present application.

[0204] The circuit board 31 is used to control the operation of electronic devices such as the display light source 36 in the movement 30. The circuit board 31 can be a single-sided board, a double-sided board, or a multi-layer board. The embodiment of the present application does not specifically limit the type, model, and size of the circuit board 31. The display light source 36 emits light under the control of the circuit board 31, and the light is transmitted to the outside of the metal shell 11 through the micropores 1321 of the light-transmitting panel 132. Among them, the display light source 36 can be in the form of a point light source, such as the LED lamp bead shown in Figure 21, or in the form of a linear light source or a surface light source, such as a display screen, and the display screen includes but is not limited to a liquid crystal display (LCD) or an organic light emitting diode display (OLED). The display light source 36 can emit light of various colors to achieve special visual effects and match different usage modes. That is, the display light source 36 emits light of different colors to represent that the oral care device is in different states. For example, when the display light source 36 emits white light, it can be used as a backup lighting source to perform the lighting function; when the display light source 36 emits red light, it means that the oral care device is in low power mode and needs to be charged; and during the charging process of the oral care device, the color of the light emitted by the display light source 36 changes to green, indicating that the oral care device has been fully charged; when the display light source 36 emits orange light, it means that the oral care device is in cleaning mode; when the display light source 36 emits yellow light, it means that the oral care device is in massage mode; when the display light source 36 emits cyan light, it means that the oral care device is in whitening mode; when the display light source 36 emits blue light, it means that the oral care device is in tooth protection mode; when the display light source 36 emits purple light, it means that the oral care device is in sensitive mode, and so on. In this way, by controlling the display light source 36 to emit light of various colors, the convenience of the user in using the oral care device can be effectively improved, thereby enhancing the user experience.

[0205] Please refer to Figures 22-23. In order to ensure the overall thickness of the metal shell 11 and facilitate the processing of micropores 1321 with smaller diameters in the metal shell 11, the metal shell 11 is provided with a thinning portion. The thickness of the thinning portion is smaller than the thickness of other parts of the metal shell 11, and the light-transmitting panel 132 is provided in the thinning portion. In one possible implementation, the inner wall of the metal shell 11 is provided with a glue-filled groove 2112 to form the thinning portion, and the light-transmitting panel 132 is located on the bottom wall of the glue-filled groove 2112. As shown in Figure 21, a glue-filled groove 2112 that is recessed outward from the inner wall can be provided on the shell wall of the metal shell 11. It should be noted that providing a thinning portion in the metal shell 11 can also reduce the distance that the light emitted by the display light source 36 travels from the micropore 1321 to the outside of the metal shell 11, further improving the display effect of the light indication light.

[0206] It is understandable that at least part of the glue-filled groove 2112 is filled with a light-transmitting colloid. That is to say, part of the space or the entire space of the glue-filled groove 2112 can be filled with a light-transmitting colloid. When filling the light-transmitting colloid, the glue-filled groove 2112 can be filled first, so that the light-transmitting colloid in the glue-filled groove 2112 is connected as one piece, and then the light-transmitting colloid in the glue-filled groove 2112 is dispersed and filled into each micropore 1321, which can effectively improve the fixing effect of the light-transmitting colloid. In addition, the light-transmitting colloid filled in the glue-filled groove 2112 can also occupy the internal space of the glue-filled groove 2112, further avoiding the accumulation of dirt and grime in the glue-filled groove 2112, and improving the waterproof level of the oral care device. Among them, there are many types of light-transmitting colloids, such as PP special plastic glue, UV glue, etc. Designers can flexibly choose light-transmitting colloids when using them. The embodiments of the present application do not specifically limit the types of light-transmitting colloids.

[0207] It should be noted that after the light-transmitting colloid is filled in the micropores 1321, the surface of the metal shell 11 usually needs to be polished to smooth the light-transmitting colloid and the surface of the handle shell 10. In this embodiment of the present application, by providing a light-transmitting opaque layer, the polishing marks can be effectively covered. In other implementations, the outer surface of the metal shell 11 can also be processed into a frosted surface, or the outer surface of the metal shell 11 can be covered with a tactile paint. The frosted surface is a polished surface obtained by grinding with abrasive grains, which can make the metal shell 11 show a natural metallic luster without the strong light of the reflected mirror surface. The tactile paint is sprayed on the surface of the metal shell 11 to have a matte or semi-matte state, with excellent scratch resistance and wear resistance, which can make the metal shell 11 feel very delicate and smooth. In addition, the outer wall surface of the light-transmitting panel 132 is smoothly connected to the outer wall surface of the part of the metal shell 11 adjacent to the light-transmitting panel 132. In this way, the handle shell 10 can form a smooth outer surface that is not easy to harbor dirt. When the outer surface of the handle shell 10 corresponding to the light-transmitting panel 132 is an arched arc surface, the outer surface of the colloid in the micropores 1321 is also convex, which has a good light diffusion effect and can make the light display effect of the light indication softer.

[0208] In some embodiments, the outer surface of the metal shell 11 can also be processed accordingly to further improve the metallic appearance of the metal shell 11. In one implementation, the outer surface of the metal shell 11 corresponding to the light-transmitting panel 132 can be covered with a light-transmitting opaque layer. The light-transmitting opaque layer can make the light-transmitting panel 132 and the micropores 1321 on the handle shell 10 almost invisible when the display light source 36 does not emit light, and only when the display light source 36 emits light, that is, is lit, can the light-transmitting panel 132 and the micropores 1321 on the handle shell 10 be clearly visible. In other words, the light-transmitting opaque layer can present a display effect consistent with that of the handle shell 10, and effectively hide the light-transmitting panel 132 when the display light source 36 does not emit light.

[0209] Referring to FIG. 21 , in some embodiments of the present application, the handle shell 10 may further include a plastic lining 12 , which is disposed on the inner wall of the metal shell 11 . Considering that the plastic lining 12 and the metal shell 11 are located on the same side of the display light source 36 , that is, the plastic lining 12 is located between the display light source 36 and the metal shell 11 , and the plastic lining 12 is typically made of non-translucent materials such as plastic and silicone, and has poor light transmittance, a second hollow hole 12b is provided in the plastic lining 12 corresponding to the translucent panel 132 , as shown in FIG. 21 . This allows the light emitted by the display light source 36 to be unaffected by the plastic lining 12 , thereby improving the light display effect of the light indication.

[0210] It is understood that the provision of the plastic lining 12 can also enhance the strength of the handle shell 10. Therefore, for a handle shell 10 having the plastic lining 12, the wall thickness of the metal shell 11 can be reduced accordingly. If the thickness of the plastic lining 12 is too small, the handle shell 10 may not be strong enough to meet the required performance. At the same time, if the thickness of the plastic lining 12 is too large, the distance between the movement 30 and the inner wall surface of the metal shell 11 may be too large, affecting the light indication effect of the light emitted by the display light source 36 in the movement 30. Therefore, considering the above two factors, in some embodiments, the thickness of the plastic lining 12 can range from 0.5mm to 2mm, for example, 0.5mm, 0.6mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, or 2mm. In this way, both the strength requirements of the handle shell 10 and the light indication effect of the light indication can be taken into account. Furthermore, the metal shell 11 and the plastic liner 12 can be integrally formed or non-integrally formed. Integrally forming the metal shell 11 and the plastic liner 12 provides a stable connection, while non-integrally forming allows for more flexible installation of the plastic liner 12.

[0211] Finally, for the handle housing 10 provided with the plastic lining 12, a first connection structure 121 for connection to the movement 30 can also be formed in the plastic lining 12. Referring to Figures 2 and 21, the inner wall of the plastic lining 12 is provided with a second limiting portion 1212; the bracket 34 is provided with a third limiting portion 224, which cooperates with the second limiting portion 1212 to conveniently and quickly achieve installation and positioning of the movement 30.

[0212] As shown in FIG2 , the second limiting portion 1212 on the inner wall of the plastic liner 12 may be a limiting groove, and the third limiting portion 224 on the bracket 34 may be the second latching protrusion 3011 shown in FIG2 . The second latching protrusion 3011 engages with the limiting groove to achieve the positioning and installation of the movement 30 and the metal shell 11. Similarly, the second limiting portion 1212 on the inner wall of the plastic liner 12 may also be a second latching protrusion 3011, and the third limiting portion 224 on the bracket 34 may also be a limiting groove. The engagement of the second latching protrusion 3011 with the limiting groove also achieves the positioning and installation of the movement 30 and the metal shell 11.

[0213] Referring to Figure 2 , to facilitate the transfer of the movement 30 to the metal shell 11 and ensure its stable installation and prevent displacement, in this embodiment of the present application, the inner wall of the plastic liner 12 is provided with a first guide portion 1213 extending in the longitudinal direction of the handle shell 10; the bracket 34 is provided with a second guide portion 3012 extending in the longitudinal direction of the handle shell 10, and the second guide portion 3012 is slidably connected to the first guide portion 1213. As shown in Figure 2 , the first guide portion 1213 of the plastic liner 12 can be a guide groove, and the second guide portion 3012 of the bracket 34 can be a guide boss. Similarly, the first guide portion 1213 of the plastic liner 12 can also be a guide boss, and the second guide portion 3012 of the bracket 34 can also be a guide groove. This allows the movement 30 to be smoothly inserted into the metal shell 11 along a predetermined direction during assembly, while preventing the movement 30 and the metal shell 11 from rotating circumferentially along the handle shell 10, thus preventing displacement.

[0214] It is understood that only one set of the first guide portion 1213 and the second guide portion 3012 can be provided, that is, one first guide portion 1213 and a second guide portion 3012 cooperating therewith, or multiple sets of the first guide portion 1213 and the second guide portion 3012 can be provided. When there are multiple sets of the first guide portion 1213 and the second guide portion 3012, they can be arranged according to a certain positional relationship around the axis of the handle housing 10. For example, when there are two sets of the first guide portion 1213 and the second guide portion 3012, the two sets of the first guide portion 1213 and the second guide portion 3012 can be symmetrically arranged about the axis of the handle housing 10; when there are three sets of the first guide portion 1213 and the second guide portion 3012, the three sets of the first guide portion 1213 and the second guide portion 3012 can be evenly distributed at 120 degrees about the axis of the handle housing 10, and so on.

[0215] Referring to FIG. 24 , a second aspect of an embodiment of the present application provides a molding process for a handle shell 10 . The molding process includes the following steps:

[0216] In step S11, the metal shell 11 and the plastic lining 12 are molded separately, and the metal shell 11 is sleeved on the outside of the plastic lining 12 through a dispensing process; alternatively, the metal shell 11 is first molded, the metal shell 11 is placed in an injection mold, and the plastic lining 12 is injection molded on the inner wall of the metal shell 11, so that the plastic lining 12 and the metal shell 11 are formed into one piece.

[0217] In this embodiment, two implementation schemes are included. The first is: first, the metal shell 11 and the plastic lining 12 are separately molded, and then the metal shell 11 is sleeved on the outside of the plastic lining 12 through a glue dispensing process; in this way, the flexibility when molding the metal shell 11 and the plastic lining 12 can be improved; the second is: first, the metal shell 11 is molded, and then the metal shell 11 is placed in an injection mold, and the plastic lining 12 is injection molded on the inner wall of the metal shell 11, so that the plastic lining 12 and the metal shell 11 are molded into one piece. In this way, the connection tightness between the plastic lining 12 and the metal shell 11 can be improved, and no glue dispensing is required, and the process is relatively simpler.

[0218] In some embodiments, the plastic liner 12 includes a first liner 12A, a second liner 12B, and a third liner 12C connected in sequence, and the metal shell 11 includes a first shell 11A sleeved on the first liner 12A and a third shell 11C sleeved on the third liner 12C. Before or after the step of sleeve-fitting the metal shell 11 to the outside of the plastic liner 12 by a dispensing process, or after the step of placing the metal shell 11 in an injection mold and injection molding the plastic liner 12 on the inner wall of the metal shell 11, the following steps are included:

[0219] Step S12: forming the second outer shell 11B on the second inner liner 12B through an injection molding process.

[0220] In this embodiment, the second shell 11B is formed on the second lining 12B by an injection molding process, so that the light-transmitting panel 132 can be formed on the second shell 11B to realize the display function of the electric toothbrush 100.

[0221] In some embodiments, after the step of molding the second shell 11B on the plastic liner 12 by injection molding, the following steps are included:

[0222] Step S13 : forming a button cap 131 on the second housing 11B through an injection molding process.

[0223] In this embodiment, the button cap 131 is formed on the second housing 11B by an injection molding process to realize the control function of the electric toothbrush 100.

[0224] In some embodiments, the plastic lining 12 is a light-transmitting plastic part. Before placing the metal housing 11 into the injection mold, the following steps are performed:

[0225] In step S14 , a first hollow hole 11 a is formed on the metal shell 11 , so that the plastic lining 12 can fill the first hollow hole 11 a during the process of injection molding the plastic lining 12 on the inner wall of the metal shell 11 .

[0226] In this embodiment, a first hollow hole 11a is opened on the metal shell 11 so that during the process of injection molding the plastic lining 12 on the inner wall of the metal shell 11, the plastic lining 12 can be filled in the first hollow hole 11a. The plastic lining 12 filled in the first hollow hole 11a can serve as a light-transmitting shell. In this way, the process is simple and the production efficiency is higher.

[0227] In some embodiments, the plastic lining 12 is a non-transparent plastic part. Before placing the metal housing 11 into the injection mold, the following steps are performed:

[0228] Step S15, opening a first hollow hole 11a on the metal shell 11;

[0229] After placing the metal shell 11 into the injection mold and injecting the plastic lining 12 into the inner wall of the metal shell 11,

[0230] In step S16 , the integrated component of the plastic lining 12 and the metal shell 11 is placed into an injection mold to form a light-transmitting second shell 11B. The second shell 11B also fills the first hollow hole 11 a.

[0231] In this embodiment, since the plastic liner 12 is a non-transparent plastic component and the second shell 11B is a translucent plastic component, the plastic liner 12 and the second shell 11B are injection molded in two steps. First, the metal shell 11 is molded, and then a hole is opened in the metal shell 11. The metal shell 11 is then placed in an injection mold, and the opaque plastic liner 12 is injection molded on the inner wall of the metal shell 11. The integrated plastic liner 12 and metal shell 11 are then placed in the injection mold to form the translucent second shell 11B. This not only forms the translucent panel 132, but also fills the first hollow hole 11a with the second shell 11B. This improves the connection stability between the second shell 11B and the second liner 12B.

[0232] In some embodiments, before or after the step of sleeve-fitting the metal shell 11 onto the outside of the plastic liner 12 by a dispensing process, or before or after the step of placing the metal shell 11 into an injection mold and injection-molding the plastic liner 12 on the inner wall of the metal shell 11, the following steps may be further included:

[0233] Step S17 , nano-processing the outer surface of the metal shell 11 .

[0234] In this embodiment, the outer surface of the metal shell 11 can be nano-processed in any step after the metal shell 11 is formed. In this way, a nano-processed layer is formed on the metal shell 11. The nano-processed layer is not easily contaminated by dirt and is easy to clean, and the surface of the metal shell 11 is smoother and has a better texture.

[0235] Referring to FIG. 25 , a third aspect of an embodiment of the present application provides another molding process for a handle shell 10 , wherein the plastic liner 12 includes a first liner 12A and a third liner 12C, the metal shell 11 includes a first shell 11A sleeved on the first liner 12A and a third shell 11C sleeved on the third liner 12C, and the handle shell 10 further includes a second liner 12B and a second shell 11B. The molding process for the handle shell 10 includes:

[0236] Step S21 , first forming a metal housing 11 , the metal housing 11 includes a first housing 11A and a third housing 11C;

[0237] Step S22: milling a second inner lining 12B on the metal shell 11. The second inner lining 12B is a metal part.

[0238] In step S23 , the metal shell 11 is placed in an injection mold, and a first lining 12A is formed inside the first shell 11A, a second shell 11B is formed on the outer wall of the second lining 12B, and a third lining 12C is formed on the inner wall of the third shell 11C.

[0239] In this embodiment, the first outer shell 11A, the second inner lining 12B, and the third outer shell 11C are integrally formed as a single metal component. This provides metal support along the length of the handle shell 10, enhancing its structural strength. Accordingly, the second outer shell 11B is a plastic component, facilitating the installation of the interactive component 13 thereon. The second outer shell 11B is injection molded onto the outer wall of the second inner lining 12B, simplifying the process and improving production efficiency. The first and third inner linings 12A, 12C, serve as mounting surfaces for the movement 30.

[0240] In some embodiments, before the step of placing the metal housing 11 into the injection mold, the method further includes:

[0241] In step S24 , a through hole is milled on at least one of the first shell 11A, the second lining 12B, and the third shell 11C, so that the corresponding first lining 12A, the second shell 11B, and the third lining 12C can be filled in the through hole.

[0242] In this embodiment, by milling a through hole on at least one of the first shell 11A, the second lining 12B and the third shell 11C, so that the corresponding first lining 12A, the second shell 11B and the third lining 12C can be filled in the through hole, the contact area between the plastic lining 12 and the metal shell 11 can be increased, and the connection stability between the plastic lining 12 and the metal shell 11 can be improved.

[0243] In some embodiments, after the step of forming the second shell 11B on the outer wall of the second shell 11B,

[0244] Step S25 : forming the button cap 131 on the second housing 11B through an injection molding process.

[0245] In this embodiment, the button cap 131 is formed on the second housing 11B by an injection molding process to realize the control function of the electric toothbrush 100.

[0246] In some embodiments, before the step of placing the metal housing 11 into the injection mold, the method further includes:

[0247] In step S26 , a metal key cap 131 is milled out of the metal housing 11 so that the thickness of the metal key cap 131 is smaller than the thickness of other positions of the metal housing 11 .

[0248] In this embodiment, a metal keycap 131 is milled out of the metal housing 11, for example, in the third housing 11C. By reducing the thickness of the metal at the metal keycap 131, the metal keycap 131 is more easily deformed when pressed by a user, and the deformation is greater, making it easier for the distance sensor to sense the deformation of the metal keycap 131. When the deformation of the metal keycap 131 detected by the distance sensor is greater than a preset threshold, the circuit board 31 determines that the metal keycap 131 has been pressed, and the circuit board 31 controls the electric toothbrush 100 to perform the function corresponding to the metal keycap 131, such as turning the electric toothbrush on and off, adjusting the brushing mode, etc.

[0249] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; 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, they are based on the orientation or position relationship shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate 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.

[0250] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An oral care device, wherein: include: A handle shell, the handle shell comprising a metal shell and a plastic liner, the metal shell being a metal part, the plastic liner being a plastic part, the plastic liner being at least partially fixed to an inner wall of the metal shell, the plastic liner comprising a first connecting structure, and at least one of the metal shell and the plastic liner being provided with a mounting cavity; as well as The movement is installed in the installation cavity, and the movement is fixed to the inner wall of the metal shell through the first connecting structure.

2. The oral care device according to claim 1, wherein: One of the inner wall of the metal shell and the outer wall of the plastic liner is provided with a protrusion, and the other is provided with a groove, and the protrusion is embedded in the groove.

3. The oral care device of claim 1, wherein: The outer wall of the plastic liner is provided with a groove, and the groove extends along the length direction of the handle shell, but does not penetrate through both ends of the plastic liner in the length direction of the handle shell; The inner wall of the metal shell is provided with a protrusion embedded in the groove.

4. The oral care device of claim 1, wherein: The contour line of the inner wall of the metal shell and the contour line of the inner wall of the plastic lining are both non-standard circles, or, The inner wall surface of the metal shell is a smooth wall surface, and the plastic lining is fixed to the smooth wall surface through an injection molding process.

5. The oral care device of claim 1, wherein: Along the radial direction of the handle shell, the plastic lining has a first thickness, the metal shell has a second thickness, and the first thickness is greater than the second thickness.

6. The oral care device of claim 1, wherein: Along the radial direction of the handle shell, the plastic lining has a first thickness, and the first thickness is not less than 0.4 mm.

7. The oral care device of claim 1, wherein: The plastic liner is formed on the inner wall of the metal shell by injection molding; or, the metal shell and the plastic are separate components, and the metal shell is assembled on the plastic liner.

8. The oral care device of claim 1, wherein: Two ends of the plastic liner along the length direction of the handle shell are flush with two ends of the metal shell along the length direction of the handle shell.

9. The oral care device of claim 1, wherein: The movement includes a second connecting structure, and the matching relationship between the second connecting structure and the first connecting structure includes at least one of snap connection, mutual limiting, mutual fixing and mutual guiding.

10. The oral care device of claim 9, wherein: The first connecting structure includes a first limiting portion and a second limiting portion which are arranged at intervals along the length direction of the handle shell. The first limiting portion abuts against one end of the movement in the length direction of the handle shell, and the second limiting portion abuts against the other end of the movement in the length direction of the handle shell, so as to at least block the movement of the movement along the length direction of the handle shell.

11. The oral care device of claim 10, wherein: The handle shell has a limiting section arranged close to the care module of the oral care device; The limiting section has a limiting cavity therein, and the first limiting portion is a cavity wall of the limiting cavity or a protruding portion arranged on the cavity wall; and / or The second limiting portion includes a first locking protrusion or a first locking groove arranged away from the limiting section, and the second connecting structure includes a second locking groove matched with the first locking protrusion or a second locking protrusion matched with the first locking groove.

12. The oral care device of claim 9, wherein: The first connecting structure includes a first guide portion, and the second connecting structure includes a second guide portion. The second guide portion and the first guide portion extend along the length direction of the handle shell and can be slidably matched along the length direction of the handle shell.

13. The oral care device of claim 9, wherein: The plastic liner further includes a cylindrical body, which is formed on the inner wall of the metal shell by injection molding and integrally forms the first connecting structure; or, The first connection structure is formed on the inner wall of the metal shell by injection molding.

14. The oral care device according to any one of claims 1 to 13, wherein: The metal shell is a metal part as a whole, the plastic liner is a plastic part as a whole, the metal shell has a first hollow hole, and the handle shell further includes: An interactive component is embedded in the first hollow hole and blocks the first hollow hole.

15. The oral care device of claim 14, wherein: The plastic lining has a second hollow hole corresponding to the first hollow hole, and the aperture of the second hollow hole is smaller than the aperture of the first hollow hole, so that the plastic lining located below the first hollow hole forms a bearing platform, and the bearing platform supports the interactive component.

16. The oral care device of claim 14, wherein: The interactive component is formed on the metal shell by an injection molding process so as to be seamlessly connected with the metal shell.

17. The oral care device of claim 14, wherein: The interactive component comprises: A key cap, the movement comprising a key corresponding to the key cap; and / or A light-transmitting panel, wherein the core comprises a display light source corresponding to the light-transmitting panel.

18. The oral care device of claim 17, wherein: The interactive component includes the key cap and the light-transmitting panel, and the key cap and the light-transmitting panel are integrally formed.

19. The oral care device of claim 14, wherein: The interactive component includes a light-transmitting panel, the movement includes a display light source corresponding to the light-transmitting panel, and the curvature of the outer surface of the light-transmitting panel is smaller than the curvature of the outer surface of the metal shell.

20. The oral care device of claim 14, wherein: The interactive component includes a light-transmitting panel, the movement includes a display light source corresponding to the light-transmitting panel, and at least a portion of the plastic lining corresponding to the light-transmitting panel is a light-transmitting component.

21. The oral care device of claim 14, wherein: The interactive component includes a light-transmitting panel, and the plastic lining includes light-transmitting plastic. The light-transmitting plastic is filled in the first hollow hole to form the light-transmitting panel.

22. The oral care device of claim 21, wherein: The outer surface of the light-transmitting plastic is provided with a colored paint layer, and the color of the colored paint layer is the same as the color of the metal shell.

23. The oral care device of claim 14, wherein: The interactive component includes a metal button cap, the metal button cap is integrally formed with the metal shell, and the metal thickness at the metal button cap is less than the thickness at other positions of the metal shell; The plastic thickness of the plastic lining at a position corresponding to the metal key cap is smaller than the thickness at other positions of the plastic lining, or the plastic lining is provided with an avoidance through hole at a position corresponding to the metal key cap; Wherein, the movement includes a circuit board and a distance sensing component electrically connected to the circuit board, and the distance sensing component is arranged corresponding to the metal key cap and is arranged to detect whether the metal key cap is deformed.

24. The oral care device of claim 23, wherein: The distance sensing element comprises: a light emitter, electrically connected to the circuit board and disposed toward the metal key cap; and An optical receiver, electrically connected to the circuit board, configured to receive an optical signal emitted by the optical transmitter and reflected by the metal key cap; Wherein, the circuit board is configured to determine whether the metal key cap is pressed according to the detection signal received by the optical receiver.

25. The oral care device of any one of claims 1-13, wherein: The handle shell comprises a first section and a second section, the first section is connected to the second section along the length direction of the handle shell, at least the outer shell portion of the first section is a metal part or the whole is a metal part to form at least part of the metal shell; at least the outer shell portion of the second section is a plastic part or the whole is a plastic part, and the second section comprises a light-transmitting panel; The core is connected to at least one of the second section and the first section via the first connecting structure. The core includes a display light source, and the display light source is arranged corresponding to the light-transmitting panel.

26. The oral care device of claim 25, wherein: The second paragraph includes: A second housing, wherein the second housing is a light-transmitting plastic part; and The second lining is arranged on the inner wall of the second outer shell. The second lining is a non-light-transmitting plastic part or a non-light-transmitting metal part, and the second lining has a light-transmitting area. The light-transmitting area and the area of ​​the second outer shell corresponding to the light-transmitting area constitute the light-transmitting panel.

27. The oral care device of claim 26, wherein: The second outer shell is formed on the surface of the second lining by an injection molding process, and the second outer shell extends into the light-transmitting area.

28. The oral care device of claim 25, wherein: The second paragraph includes: a second housing, the second housing being a non-light-transmitting plastic part, the second housing having an external light-transmitting hole, and A second lining, the second lining is a light-transmitting plastic part, and is disposed on the inner wall of the second shell, and a portion of the second lining extending into the outer light-transmitting hole constitutes the light-transmitting panel; Wherein, the plastic lining includes the second lining.

29. An oral care device according to any one of claims 26 to 28, wherein: The second outer shell is disposed around the second inner liner, and / or the second outer shell and the second inner liner are both plastic parts and are integrally formed.

30. The oral care device of any one of claims 26-28, wherein: The second paragraph also includes: A button cap, the second shell has a first mounting hole, the second lining has a second mounting hole, the first mounting hole corresponds to the second mounting hole, the button cap is arranged in the first mounting hole and connected to the second shell, and at least the part connected to the second shell is a soft rubber part.

31. The oral care device of claim 25, wherein: The first paragraph includes: a first housing, the first housing being a metal piece, the metal housing including the first housing; and The first liner extends from the second section into the first section and is connected to the inner wall of the first shell. The plastic liner includes the first liner.

32. The oral care device of claim 31 , wherein: The first liner extends to an end of the first section facing away from the second section.

33. The oral care device of claim 31 , wherein: The thickness of the first liner is greater than the thickness of the first shell.

34. The oral care device of claim 31 , wherein: The thickness of the first lining is not less than 0.6 mm and not more than 2.5 mm, and the thickness of the first outer shell is not less than 0.3 mm and not more than 1.2 mm.

35. The oral care device of claim 31 , wherein: The first connecting structure is arranged on the second section and / or the first lining, and the first connecting structure is arranged to cooperate with the second connecting structure on the movement, and the cooperation relationship between the second connecting structure and the first connecting structure includes at least one of snap-on, mutual limiting, mutual fixing and mutual guiding.

36. The oral care device of claim 31 , wherein: The contour line of the inner wall of the first shell and the contour line of the inner wall of the first liner are both non-standard circles, or the inner wall surface of the first shell is a smooth wall surface, and the first liner is fixed to the smooth wall surface by an injection molding process.

37. The oral care device of claim 31 , wherein: The first liner is formed on the inner wall of the first shell by an injection molding process and is integrally formed with the second section; or, the first shell and the first liner are separate components, the first shell is assembled to the first liner, and the first liner is integrally formed with the second section.

38. The oral care device of claim 25, wherein: A first guide portion is provided on the inner wall of the second section, the first guide portion is configured to be slidably matched with a second guide portion on the movement, and the first guide portion and the light-transmitting panel are located on different sides of the second section in the circumferential direction; Wherein, the first connecting structure includes the first guiding portion.

39. The oral care device of claim 31 , wherein: The first housing has a key cap area, and the thickness of the key cap area is smaller than the thickness of other positions of the first section.

40. The oral care device of claim 25, wherein: The surface of the second section smoothly transitions to the surface of the first section.

41. An oral care device according to any one of claims 1 to 40, wherein: The handle shell comprises a first section and a second section which are sequentially connected along the length direction of the handle shell; The first section includes a first outer shell and a first lining fixed to the inner wall of the first outer shell; The second section includes a second outer shell and a second lining fixed to the inner wall of the second outer shell; Wherein, the metal shell includes at least the first shell, the plastic lining includes at least the first lining, and the second shell is provided with an interactive component.

42. The oral care device of any one of claims 1-40, wherein: The handle shell comprises a first section, a second section and a third section which are sequentially connected along the length direction of the handle shell; The first section includes a first outer shell and a first lining fixed to the inner wall of the first outer shell; The second section includes a second outer shell and a second lining fixed to the inner wall of the second outer shell; The third section includes a third outer shell and a third lining fixed to the inner wall of the third outer shell; The metal shell at least includes the first shell and the third shell, the plastic lining at least includes the first lining and the third lining, and the second shell is provided with an interactive component.

43. The oral care device of claim 42, wherein: The second section is entirely a plastic part, and the first liner, the second section and the third liner are integrally formed.

44. The oral care device of claim 42, wherein: The interactive component includes a light-transmitting panel, the second section is entirely a light-transmitting plastic part, a light-shielding layer is disposed on the surface of the second section, and the area of ​​the second section where the light-shielding layer is not disposed forms the light-transmitting panel.

45. The oral care device of claim 42, wherein: The second lining is a metal part, and the first shell, the second lining and the third shell are integrally formed; The second shell is a plastic part, and the second shell is molded on the outer wall of the second liner.

46. ​​The oral care device of claim 45, wherein: The interactive component includes a light-transmitting panel, and the second lining is provided with a second hollow hole corresponding to the light-transmitting panel.

47. The oral care device of claim 42, wherein: The plastic lining includes the first lining, the second lining and the third lining, and the first lining, the second lining and the third lining are integrally formed; The interactive component includes a light-transmitting panel, the second shell is a light-transmitting plastic component, the second shell is molded on the outer wall of the second lining, and the second lining has a light-transmitting area corresponding to the light-transmitting panel.

48. The oral care device of claim 47, wherein: The second lining is a light-transmitting plastic part, a light-shielding layer is further provided on the surface of the second lining, and the area of ​​the second lining not provided with the light-shielding layer is the light-transmitting area; or The second inner lining is a non-light-transmitting member, and the light-transmitting area is a second hollow hole opened on the second inner lining. The second shell is embedded in the second hollow hole, and a portion of the second shell embedded in the second hollow hole is light-transmissive.

49. The oral care device of claim 47, wherein: The second outer shell is arranged around the second liner, and the light-transmitting area of ​​the second liner is located on at least one of the front side, the rear side, the left side and the right side of the second liner.

50. The oral care device of claim 42, wherein: The interactive component includes a button cap, the second shell has a first mounting hole, the second lining has a second mounting hole, and the button cap is mounted on the first mounting hole and is arranged corresponding to the second mounting hole.

51. The oral care device of claim 42, wherein: The plastic lining includes a first limiting portion and a second limiting portion which are arranged at intervals along the length direction of the handle shell. The first limiting portion is arranged on the third lining, and the first limiting portion abuts against one end of the movement in the length direction of the handle shell. The second limiting portion is arranged on the first lining, and the second limiting portion abuts against the other end of the movement in the length direction of the handle shell to at least block the movement of the movement along the length direction of the handle shell.

52. The oral care device of claim 42, wherein: The plastic lining also includes a first guide portion, which is at least arranged on the third lining; the movement includes a second guide portion, which extends along the length direction of the handle shell with the first guide portion and can be slidably matched with the first guide portion along the length direction of the handle shell.

53. The oral care device of claim 52, wherein: The first guide portion also extends to the second lining along the length direction of the handle shell, and the first guide portion and the interaction member are located on different sides of the second lining.

54. The oral care device of claim 42, wherein: Along the length direction of the handle shell, the first section has a first length, the second section has a second length, the third section has a third length, the ratio of the third length to the second length is not less than 1 / 4 and not greater than 1 / 2, and the ratio of the second length to the first length is not less than 1 / 2 and not greater than 3.

55. The oral care device of claim 42, wherein: The outer surface of the second shell smoothly transitions to the outer surfaces of the first shell and the third shell.

56. The oral care device of claim 42, wherein: The third section is disposed close to the brush head of the oral care device, the first section is disposed far from the brush head, the length of the third section is smaller than the length of the second section, and the length of the second section is smaller than the length of the first section.

57. The oral care device of claim 42, wherein: The length of the third section is not less than 10 mm, the length of the second section is not less than 30 mm, the length of the first section is not less than 40 mm, and the total length of the handle shell is greater than 100 mm.

58. An oral care device according to any one of claims 1 to 57, wherein: The bottom end of the handle shell has a mounting opening communicating with the mounting cavity; The movement includes a bracket and a circuit board, the bracket is fixed to the handle shell through the first connecting structure, and the circuit board is installed on the bracket and extends 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 connected to the installation cavity, and a portion of the circuit board extends into the receiving cavity.

59. The oral care device of claim 58, wherein: 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.

60. The oral care device of claim 59, wherein: 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.

61. The oral care device of claim 59, wherein: The core also includes a motor and a display light source 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 light source is arranged on the outer surface of the motor housing, and the display light source 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.

62. The oral care device of claim 58, wherein: 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 cap, and the front side surface is arranged toward the button cap.

63. The oral care device of claim 62, wherein: 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.

64. The oral care device of claim 58, wherein: The circuit board comprises: An extending section, located in the accommodating cavity; and 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.

65. The oral care device of claim 58, wherein: The bottom cover comprises: A bottom plate configured to cover the mounting opening; and 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 sealing section close to the bottom plate, the cylindrical portion passes through the sealing section and is sealed with the sealing section, and the thickness of the sealing section is smaller than the thickness of other parts of the plastic liner.

66. The oral care device of claim 65, wherein: 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.

67. The oral care device of claim 58, wherein: The bottom cover comprises: A bottom plate configured to cover the mounting opening; and 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.

68. The oral care device of claim 67, wherein: 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.

69. The oral care device of claim 68, wherein The snap-on structure formed by the first snap-on member and the second snap-on member includes two groups, the two groups of snap-on structures 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 groups of snap-on structures and spaced apart from the snap-on structures.

70. The oral care device of claim 67, wherein: 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.

71. The oral care device of claim 70, wherein: 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.

72. The oral care device of any one of claims 58-71, wherein: Also includes: The charging component is arranged on the handle shell, penetrates the handle shell and is electrically connected to the circuit board.

73. An oral care device according to any one of claims 1-72, wherein: The plastic liner includes a cylindrical sealing section, the sealing section is arranged near the mounting opening at the bottom of the handle shell, and the mounting opening is communicated with the mounting cavity; the oral care device also includes: The bottom cover at least partially penetrates the sealing section and covers the installation opening. A sealing member is provided between the outer peripheral wall of the bottom cover and the inner peripheral wall of the sealing section. The sealing member is configured to seal the gap between the bottom cover and the sealing section.

74. The oral care device of claim 73, wherein: The outer peripheral wall of the bottom cover has a glue filling groove arranged in an annular shape, the sealing member includes glue filled in the glue filling groove, and the glue is bonded to the inner peripheral wall of the sealing section; and / or, The outer peripheral wall of the bottom cover has an annular groove arranged in an annular shape, and the sealing member includes a sealing ring partially arranged in the annular groove, and the sealing ring is interference-fitted with the inner peripheral wall of the sealing section.

75. The oral care device of claim 74, wherein: The outer peripheral wall of the bottom cover has the glue filling groove configured to be filled with the adhesive and the annular groove provided with the sealing ring, and the glue filling groove is closer to the movement than the annular groove.

76. The oral care device of claim 73, wherein: At least one of the metal housing, the movement and the sealing section includes a second snap-fit ​​component, and the bottom cover includes a first snap-fit ​​component, and the first snap-fit ​​component is snap-fitted with the second snap-fit ​​component.

77. The oral care device of claim 73, wherein: The plastic liner is formed on the inner wall of the metal shell by an injection molding process, so that the sealing section and the metal shell are sealed and connected.

78. The oral care device of claim 73, wherein: The bottom cover comprises: A bottom plate configured to cover the mounting opening; and A cylindrical portion, which is arranged in a cylindrical shape on a surface of the bottom plate facing the movement, the cylindrical portion is passed through the sealing section, and the sealing member is arranged between the cylindrical portion and the sealing section; Wherein, the metal shell includes a protruding section protruding relative to the bottom of the sealing section along the length direction of the handle shell, so that a first step structure is formed between the sealing section and the protruding section; 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 embedded in the protruding section.

79. The oral care device of claim 78, wherein An adhesive is provided between the outer peripheral wall of the bottom plate and the inner peripheral wall of the protruding section, and the adhesive is bonded to the peripheral side wall of the bottom plate and the inner peripheral wall of the protruding section; and / or, Adhesive and / or a sealing ring is arranged between the step surface of the first step structure and the step surface of the second step structure.

80. The oral care device of claim 78, wherein: The shape of the inner circumferential wall of the sealing section is non-cylindrical, and the shape of the outer circumferential wall of the cylindrical portion is arranged to correspond to the shape of the inner circumferential wall of the sealing section to achieve alignment installation; or, The shape of the inner peripheral wall of the protruding section is non-cylindrical, and the shape of the outer peripheral wall of the bottom plate is set corresponding to the shape of the inner peripheral wall of the protruding section to achieve alignment installation; or, The inner peripheral wall of the sealing section and the inner peripheral wall of the protruding section are both cylindrical, and the outer peripheral wall of the bottom plate and the outer peripheral wall of the cylindrical portion are both cylindrical.

81. An oral care device according to any one of claims 73 to 80, wherein: The plastic lining also includes: A connecting section connected to the sealing section along the length direction of the handle shell, the connecting section and the sealing section jointly form the installation cavity, and the sealing section is provided with the first connecting structure; Wherein, the first connecting structure, the connecting section and the sealing section are integrally formed.

82. The oral care device of claim 81 , wherein: The thickness of the sealing section is smaller than the thickness of the connecting section.

83. The oral care device of claim 82, wherein: A transition slope is arranged at the connection between the sealing section and the connecting section, and the transition slope is arranged to be gradually ascending from the sealing section to the connecting section.

84. The oral care device of claim 81 , wherein: The movement comprises: The bracket includes a second connection structure that cooperates with the first connection structure, and the cooperation relationship between the second connection structure and the first connection structure includes at least one of snap connection, mutual limitation, mutual fixation and mutual guidance.

85. The oral care device of claim 84, wherein The first connecting structure includes a first guide portion, and the second connecting structure includes a second guide portion, the second guide portion and the first guide portion extend along the length direction of the handle shell and can be slidably matched along the length direction of the handle shell; The first guide portion does not extend to the sealing section, and the first guide portion extends from an end of the connecting section close to the sealing section to an end of the connecting section away from the sealing section.

86. An oral care device according to any one of claims 1-85, wherein The shell wall of the metal shell is provided with a light-transmitting panel, the light-transmitting panel includes a plurality of micropores, the micropores are filled with a light-transmitting colloid, and the micropores filled with the light-transmitting colloid on one of the light-transmitting panels are arranged to produce the same indication effect; and The movement comprises a display light source, and the light emitted by the display light source is transmitted to the outside of the metal shell through the micro holes of the light-transmitting panel.

87. The oral care device of claim 86, wherein The diameter of the micropores is 0.1 mm to 0.2 mm.

88. The oral care device of claim 87, wherein The wall thickness of the metal shell is 0.8 to 2 times the diameter of the micropore.

89. The oral care device of claim 87, wherein: The distance between the axes of two adjacent micropores is 1.5 to 3 times the diameter of the micropores.

90. The oral care device handle of claim 86, wherein: The wall thickness of the metal shell is 0.3 mm to 0.5 mm.

91. An oral care device according to any one of claims 86 to 90, wherein The metal shell is provided with a thinned portion, the thickness of the thinned portion is smaller than the thickness of other portions of the metal shell, and the light-transmitting panel is provided at the thinned portion.

92. The oral care device of claim 91, wherein The inner wall of the metal shell is provided with a glue-filled groove to form the thinning portion, and the light-transmitting panel is located at the bottom wall of the glue-filled groove.

93. The oral care device of claim 92, wherein: At least a portion of the glue-filling groove is filled with a light-transmitting glue.

94. The oral care device of claim 86, wherein: The outer surface of the metal shell corresponding to the light-transmitting panel is covered with a light-transmitting opaque layer; or, The outer surface of the metal shell is a frosted surface, or the outer surface of the metal shell is covered with a touch paint.

95. An oral care device according to any one of claims 86 to 90, wherein The inner wall of the plastic liner is provided with a first limiting portion; The movement also includes a bracket, the display light source is fixed to the bracket, and a second limiting portion is provided on the bracket, and the second limiting portion is limitedly matched with the first limiting portion; The plastic lining is provided with a second hollow hole corresponding to the light-transmitting panel.

96. The oral care device of claim 95, wherein The thickness of the plastic lining ranges from 0.5 mm to 2 mm.

97. A molding process for a handle shell, wherein: The molding process comprises the following steps: A metal shell and a plastic lining are formed separately, and the metal shell is sleeved on the outside of the plastic lining by a dispensing process; or, First, a metal shell is molded, and the metal shell is placed in an injection mold, and a plastic lining is injection molded on the inner wall of the metal shell, so that the plastic lining and the metal shell are molded as one body.

98. The molding process according to claim 97, wherein: The plastic lining includes a first lining, a second lining and a third lining connected in sequence, the metal shell includes a first shell sleeved on the first lining and a third shell sleeved on the third lining, before or after the step of sleeve-fitting the metal shell on the outside of the plastic lining by a dispensing process, or after the step of placing the metal shell in an injection mold and injection-molding the plastic lining on the inner wall of the metal shell, including: The second outer shell is formed on the second inner liner by an injection molding process.

99. The molding process according to claim 98, wherein: After the step of molding the second shell on the plastic liner by injection molding, the method includes: A key cap is formed on the second housing by an injection molding process.

100. The molding process according to claim 97, wherein: The plastic lining is a light-transmitting plastic part. Before the step of placing the metal shell into the injection mold, the method includes: A first hollow hole is provided on the metal shell, so that during the process of injection molding a plastic lining on the inner wall of the metal shell, the plastic lining can be filled in the first hollow hole.

101. The molding process according to claim 97, wherein: The plastic lining is a non-light-transmitting plastic part. Before the step of placing the metal shell into the injection mold, the steps include: Opening a first hollow hole on the metal shell; The metal shell is placed in an injection mold, and a plastic lining is injection molded on the inner wall of the metal shell. The integrated piece of the plastic lining and the metal shell is placed in an injection mold to form a light-transmitting second shell, and the second shell also fills the first hollow hole.

102. A molding process according to any one of claims 97 to 101, wherein: Before or after the step of sleeve-fitting the metal shell onto the outside of the plastic liner by a dispensing process, or before or after the step of placing the metal shell into an injection mold and injection-molding the plastic liner on the inner wall of the metal shell, the method further includes: The outer surface of the metal shell is nano-processed.

103. The molding process according to claim 102, wherein: The plastic liner includes a first liner and a third liner, the metal shell includes a first shell sleeved on the first liner and a third shell sleeved on the third liner, and the handle shell also includes a second liner and a second shell; The molding process of the handle shell includes: Firstly, a metal shell is formed, wherein the metal shell includes the first shell and the third shell; milling a second lining on the metal shell, wherein the second lining is a metal part; The metal shell is placed in an injection mold, a first liner is formed inside the first shell, a second shell is formed on the outer wall of the second liner, and a third liner is formed on the inner wall of the third shell.

104. The molding process according to claim 103, wherein: Before the step of placing the metal housing into the injection mold, the method further comprises: A through hole is milled on at least one of the first outer shell, the second lining and the third outer shell, so that the corresponding first lining, the second outer shell and the third lining can be filled in the through hole.

105. The molding process according to claim 103, wherein: After the step of forming the second outer shell on the outer wall of the second liner, A key cap is formed on the second housing by an injection molding process.

106. A molding process according to any one of claims 103 to 105, wherein: Before the step of placing the metal housing into the injection mold, the method further comprises: A metal key cap is milled out of the metal shell so that the metal thickness at the metal key cap is smaller than the thickness at other positions of the metal shell.

Images