Electric toothbrush
By setting a pressing area on the motor support frame of the electric toothbrush, the rotation of the toothbrush head drive component makes the pressure-sensitive element detect the toothbrush head stress, solving the problems of toothbrush damage and foam splashing, and improving the service life and production efficiency of the toothbrush.
Patent Information
- Application Number
- CN202420996127.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-09
AI Technical Summary
When the toothbrush head and teeth interact with each other with a large force, high-frequency vibration will cause damage to the teeth. When the toothbrush head does not come into contact with the teeth, vibrating will cause foam splash. Currently, vibration is controlled through the motor shaft deformation pressure detection, but this The method has problems of complex process and low production efficiency.
An electric toothbrush is designed, and the first and second pressing areas are arranged on the motor support frame, and the pressure-release element is attached respectively. The second pressing area is deformed by the rotation of the toothbrush head driving member, and the pressure-receiving element outputs an electrical signal. It realizes the detection of the stress level of the toothbrush head without the need to be slotted on the motor shaft to ensure signal accuracy and the strength of the motor support frame.
By detecting the degree of stress on the toothbrush head, avoiding tooth damage and foam splashing, the service life and reliability of the toothbrush are improved, the production process is simplified, and the production cost is reduced.
Smart Images
Figure CN222285672U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of oral care, in particular to an electric toothbrush. Background Art
[0002] Electric toothbrushes clean teeth by using high-frequency vibrations generated by the motor on the toothbrush head. However, when the interaction force between the toothbrush head and the teeth is large, this high-frequency vibration will damage the tooth surface. When the toothbrush head is not in contact with the teeth, the high-frequency vibration will cause foam from the toothbrush head to splash. Therefore, the deformation pressure of the motor shaft can be used to control the vibration size and achieve overpressure and splash prevention functions.
[0003] Currently, a slot is usually set on the motor shaft of an electric toothbrush, and a pressure-sensitive core is set at the slot position, which is connected to the PCB board through a flexible circuit board. The pressure signal received by the pressure-sensitive chip is transmitted to the control circuit of the PCB board to control the vibration frequency or intensity of the motor.
[0004] At present, instant adhesive is usually used to stick the pressure-sensing chip to the slotted position. The slot weakens the strength of the motor shaft, so the motor shaft is prone to deformation and failure during the drop test. In addition, the process of sticking the chip on the thin motor shaft is complicated, which reduces production efficiency. The flexible circuit board that connects the pressure-sensing chip to the PCB board is also prone to reduced life due to motor shaft vibration.
[0005] Therefore, people currently hope to detect the pressure on the motor shaft by means other than setting slots on the motor shaft. Utility Model Content
[0006] In view of the technical problems existing in the electric toothbrush in the prior art, the utility model proposes an electric toothbrush, comprising:
[0007] case;
[0008] The motor support frame is arranged in the housing and fixed to the housing;
[0009] A PCB board is arranged in the housing and connected to the motor support frame, the PCB board is provided with a first pressing area and a second pressing area, and the first pressing area and the second pressing area are respectively placed with a first pressure sensing element and a second pressure sensing element;
[0010] A toothbrush head driving component is arranged in the housing, driving the toothbrush head connected to the output shaft thereof to vibrate, the toothbrush head driving component further comprising a supporting end and a triggering end, the supporting end being connected to the motor supporting frame, and the triggering end corresponding to the second pressing area of the PCB board;
[0011] When the toothbrush head is subjected to a force in the direction of the bristles, the toothbrush head driving component rotates relative to the motor support frame around the supporting end as a fulcrum, the triggering end of the toothbrush head driving component approaches or moves away from the second pressing area, the second pressing area is deformed, and the second pressure sensing element outputs an electrical signal according to the deformation of the second pressing area.
[0012] Preferably, the toothbrush head driving component includes a motor, a front shell connected to the motor, and a rear shell, the front shell is connected to the motor support frame and serves as a supporting end, and the rear shell is elastically connected to the motor support frame and serves as a triggering end.
[0013] Preferably, the motor support frame includes a sleeve that is compatible with the front shell, and the front shell can be assembled into the sleeve along the axial direction of the motor, and the output shaft extends through the sleeve to the outside of the sleeve, and when the toothbrush head is subjected to a force along the direction of the bristles, the motor rotates with the contact part of the front shell and the sleeve as a fulcrum.
[0014] Preferably, the outer wall of the front shell is provided with raised ribs extending toward the sleeve body, the front shell and the sleeve body are in contact only through the raised ribs, and the front shell rotates relative to the sleeve body with the raised ribs as a fulcrum.
[0015] Preferably, the rear housing is provided with a columnar portion extending toward the second pressing area of the PCB board, and the columnar portion is configured to press the second pressing area with the movement of the housing.
[0016] Preferably, the rear housing is also provided with an elastic reset structure, both ends of which are respectively connected to the rear housing and the supporting component, and the elastic reset structure is used to keep the columnar portion restored to an initial position when the output shaft is in a non-pressurized state.
[0017] Preferably, the PCB board is configured to isolate stresses from each other in the first pressing area and the second pressing area.
[0018] Preferably, the first pressing area and the second pressing area are distributed along the length direction of the PCB board, and two limiting grooves are provided on both sides of the first pressing area along the length direction of the PCB board, and two limiting plates adapted to the limiting grooves are provided on the motor support frame.
[0019] Preferably, the first pressing area and the second pressing area are configured as stress concentration areas of the PCB board.
[0020] Preferably, the motor support frame is further provided with a fastening portion, which is connected to the PCB board and limits the displacement of the surrounding portion of the second pressing area of the PCB board relative to the motor support frame.
[0021] Compared with the prior art, the advantages of the utility model are:
[0022] The utility model uses a motor and its accessories as a force transmission structure, and sets a fulcrum connected to the shell at the front end of the motor. When the toothbrush head at the front end of the motor is moved by force, the motor and its accessories can be used as a lever to rotate around the fulcrum, so that the structure of its tail squeezes a specific area of the PCB board to cause it to deform. Therefore, the degree of force on the toothbrush head can be reflected by detecting the deformed part. In addition, the deformed area and the deformed area on the PCB board that is pressed as the main button are independent of each other, thereby ensuring the accuracy of the two pressure signal inputs, realizing the assembly of two pressure sensing chips on the same PCB board, and the output shaft of the motor does not need to be slotted, thereby improving the service life and reliability of the electric toothbrush. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The accompanying drawings are not intended to be drawn to scale. In the accompanying drawings, each identical or nearly identical component shown in various figures may be represented by the same reference numeral. For the sake of clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the utility model will be described by way of example and with reference to the accompanying drawings, in which:
[0024] Figure 1 is an exploded view of the electric toothbrush shown in the embodiment of the utility model;
[0025] Figure 2 It is a schematic diagram of the force state of the toothbrush head driving component shown in the embodiment of the utility model;
[0026] Figure 3 It is a schematic diagram showing that the toothbrush head driving component shown in the embodiment of the utility model is equivalent to a lever;
[0027] Figure 4 It is a structural schematic diagram of the front housing and the sleeve body shown in an embodiment of the utility model;
[0028] Figure 5 It is a schematic diagram of the plane where the columnar portion shown in the embodiment of the utility model is located;
[0029] Figure 6 is a schematic diagram of a first pressing area and a second pressing area shown in an embodiment of the utility model;
[0030] Figure 7 It is a schematic diagram of the elastic reset structure shown in the embodiment of the utility model. DETAILED DESCRIPTION
[0031] In order to better understand the technical content of the present invention, specific embodiments are described below in conjunction with the accompanying drawings.
[0032] Combination Figure 1-2 As shown, the utility model provides an electric toothbrush, including a housing 40 , a toothbrush head driving component, a motor support frame 20 and a PCB board 30 .
[0033] The toothbrush head driving component includes a supporting end 102 and a triggering end 103. The supporting end 102 of the toothbrush head driving component is connected to the motor supporting frame 20, and the triggering end 103 is arranged corresponding to the second pressing area 3B.
[0034] In particular, when the toothbrush head 50 is subjected to force along the direction of the bristles, the toothbrush head driving component can rotate relative to the motor support frame 20 around the supporting end 102 as a fulcrum, so that the trigger end 103 of the toothbrush head driving component is close to or away from the second pressing area 3B, causing the second pressing area 3B to deform. The pressure-sensitive element in the second pressing area 3B can detect the pressure change caused by the deformation and output different electrical signals.
[0035] It should be understood that the purpose of the pressure-sensing structure of the brush head of the electric toothbrush is to detect the magnitude of the compressive stress on the toothbrush head, and the toothbrush head driving component is generally considered to be a rigid structure. Therefore, the motor support frame 20 is intended to provide a fulcrum for the toothbrush head driving component and provide support for the PCB board 30, so that when the toothbrush head 50 at the front end of the toothbrush head driving component is compressed, the tail end can undergo relative displacement, and based on this, a specific area of the PCB board 30 is deformed, so as to facilitate the subsequent quantification of the pressure on the toothbrush head 50.
[0036] The toothbrush head driving component is configured to drive the toothbrush head 50 connected to its output shaft 101 to vibrate.
[0037] Optionally, the toothbrush head driving component includes a motor, such as a magnetic levitation motor or a sonic motor.
[0038] The motor support frame 20 is connected to the housing 40 of the electric toothbrush, and both the motor support frame 20 and the housing 40 are fixed accessories of the electric toothbrush. Optionally, the housing 40 and the motor support frame 20 are made of rigid materials, such as hard plastic or metal.
[0039] Furthermore, the PCB board 30 is connected to the motor support frame 20, and the PCB board 30 is provided with a first pressing area 3A and a second pressing area 3B, and the first pressing area 3A and the second pressing area 3B are respectively used to place a first pressure sensing element 30a and a second pressure sensing element 30b for detecting whether the corresponding area is under pressure. In this way, when the first pressing area or the second pressing area is deformed, the first pressure sensing sensor 30a or the second pressure sensing sensor 30b detects the pressure change.
[0040] In a preferred embodiment, the first pressing area 3A and the second pressing area 3B are configured as stress concentration areas of the PCB board 30. The stress concentration area is an easily deformed area, that is, relative to other areas of the PCB board 30, after pressure is applied to the first pressing area 3A and the second pressing area 3B, the first pressing area 3A and the second pressing area 3B are more likely to deform.
[0041] In an optional embodiment, for the PCB board 30, a local area can be easily deformed by thinning the thickness, narrowing the width or slotting, that is, forming a stress concentration area.
[0042] like Figure 6 As shown, the PCB board 30 has two first strip grooves 302 arranged along the length direction thereof in the first pressing area 3A, and the first pressure sensor 30a is attached to the narrow surface formed between the two first strip grooves 302 to detect the deformation of the area. The PCB board 30 has two second strip grooves 301 arranged along the length direction thereof in the pressing area, and the second pressure sensor 30b is attached to the narrow surface formed between the two second strip grooves 301 to detect the deformation of the area.
[0043] The first pressing area 3A of the PCB board 30 is used to provide a pressure detection area for the main control button of the electric toothbrush, which is usually installed on the housing 40 and is actively pressed by the user. The second pressing area 3B of the PCB board 30 is a pressure detection area specifically used to detect whether the toothbrush head 50 is under pressure.
[0044] It is understandable that, since the two pressing areas are used to receive different pressure signals respectively, the PCB board 30 is configured to isolate stresses from each other in the first pressing area 3A and the second pressing area 3B, so as to avoid mutual interference of stresses in the two pressing areas.
[0045] In an optional embodiment, if Figure 2 and 6 As shown, the first pressing area 3A and the second pressing area 3B are distributed along the length direction of the PCB board 30. Along the length direction of the PCB board 30, two limiting grooves are provided on both sides of the first pressing area 3A, and the motor bracket 20 is provided with two limiting plates 22 adapted to the limiting grooves.
[0046] In this way, the area of the PCB board 30 between the two limiting plates 22 is isolated. Even if the part of the PCB board 30 outside the limiting plates 22 is deformed, it will not cause the first pressing area 3A between the limiting plates 22 to deform, so as to achieve the effect of stress isolation. In addition, the PCB board 30 can also be positioned by the two limiting plates 22.
[0047] like Figure 1As shown, the toothbrush head driving component includes a motor 10, a front shell 11 connected to the motor 10, and a rear shell 12, the front shell 11 is connected to the motor support frame 20 and serves as a support end 102, and the rear shell 12 is elastically connected to the motor support frame 20 and serves as a trigger end 103.
[0048] Furthermore, the motor bracket 20 includes a sleeve 21 adapted to the front shell 11. The motor bracket 20 and the front shell 11 can be assembled into the sleeve 21 along the axial direction of the motor 10, and the output shaft 101 passes through the sleeve 21 and extends to the outside of the sleeve 21. When the output shaft 101 is subjected to radial force, the motor 10 rotates with the contact part of the front shell 11 and the sleeve 21 as the fulcrum.
[0049] It can be understood that the constraint between the front housing 11 and the sleeve 21 at the front end of the motor 10 is stronger than the rest of the motor 10, especially the output shaft 101 at the front end of the motor 10 and the rear housing 12 at the tail end have a higher degree of freedom relative to the motor support frame 20, so that the motor 10 and the front housing 11 and the rear housing 12 can be simplified into a lever, such as Figure 3 As shown, the front shell 11 is in the middle position of the lever as a fulcrum, the output shaft 101 is the force-bearing end of one end of the lever, and the rear shell 12 is the other force-bearing end of the lever. When the toothbrush head 50 is pressurized, the rear shell 12 undergoes corresponding displacement, thereby achieving extrusion deformation of the second pressing area 3B of the PCB board 30.
[0050] In a preferred embodiment, Figure 4 As shown, the outer wall of the front housing 11 is provided with a raised rib 111 extending toward the sleeve 21, so that the front housing 11 and the sleeve 21 are in contact only through the raised rib 111, so that the front housing 11 can rotate relative to the sleeve 21 with the raised rib 111 as a fulcrum.
[0051] Thus, by constructing the raised ribs 111 on the outer wall of the front housing 11, the indirect area between the housing 21 can be reduced, which is particularly beneficial for rotating the motor 10 with the raised ribs 111 as a fulcrum, making the force feedback response more accurate and timely.
[0052] It can be understood that the raised ribs 211 can be an annular continuous structure or a discontinuous structure distributed along the outer circumference of the front shell 11. Preferably, the outer contour surface of the raised ribs 111 is an arc surface.
[0053] Furthermore, the inner wall of the sleeve 21 is configured to accommodate an avoidance groove 211 for accommodating the front shell 11 and the raised ribs 111 . The length of the avoidance groove 211 is greater than the length of the front shell 11 , and its cross-sectional dimension is equal to the outer contour dimension of the front shell 11 at the raised ribs 111 .
[0054] In this way, when the front housing 11 rotates with the protruding rib 111 as a fulcrum, the remaining part of the front housing 11 will not interfere with the inner wall of the sleeve body 21 in movement.
[0055] Furthermore, the rear housing 12 is provided with a columnar portion 121 extending toward the second pressing area 3B of the PCB board 30 , and the columnar portion 121 is configured to press the second pressing area 3B with the movement of the rear housing 12 .
[0056] In a preferred embodiment, the setting direction of the columnar portion 121 is consistent with the direction of the bristles of the toothbrush head 50, and the PCB board 30 is perpendicular to the direction of the bristles of the toothbrush head 50. Therefore, only after the toothbrush head 50 is pressed in the direction of the bristles, the columnar portion 121 moves toward the second pressing area 3B, causing the second pressing area 3B to deform.
[0057] In a preferred embodiment, the rear housing 12 is also provided with an elastic reset structure, the two ends of which are respectively connected to the rear housing 12 and the motor bracket 20, and the elastic reset structure is used to keep the columnar portion 121 restored to its initial position when the output shaft 101 is in a non-pressurized state.
[0058] like Figure 7 As shown, the elastic reset structure includes two elastic sheets 122 extending from the rear end of the rear shell 12 , and a movable space for the columnar portion 121 is reserved between the two elastic sheets 122 . The two elastic sheets 122 extend forward and are connected to the motor support frame 20 by fastening screws 123 .
[0059] Optionally, the elastic sheet 122 may be a plastic sheet or a metal sheet with good restorability.
[0060] In this way, by providing the elastic sheet 122 , the rear portion of the rear housing 12 can be kept in a reliable initial position. Even if the rear housing 12 is forced to leave the initial position, it can return to the initial position after the external force disappears.
[0061] like Figure 5-6 As shown, the motor bracket 20 is further provided with a fastening portion 23 , which is connected to the PCB board 30 and limits the displacement of the surrounding portion of the second pressing area 3B of the PCB board 30 relative to the motor bracket 20 .
[0062] The fastening portions 23 are particularly disposed on both sides of the second pressing area 3B to limit the columnar portion 121 from pressing the second pressing area 3B to cause the right end of the PCB board 30 to move.
[0063] Specifically, the fastening portion 23 is a pair of hook-shaped structures, which are clamped on the edge of the PCB board 30 .
[0064] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. A person with ordinary knowledge in the technical field to which the present invention belongs may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.
Claims
1. An electric toothbrush, characterized in that: include: Housing (40); The motor support frame (20) is arranged in the housing (40) and is relatively fixed to the housing (40); A PCB board (30) is arranged in the housing (40) and connected to the motor support frame (20), the PCB board (30) being provided with a first pressing area (3A) and a second pressing area (3B), the first pressing area (3A) and the second pressing area (3B) being respectively provided with a first pressure sensing element (30a) and a second pressure sensing element (30b); A toothbrush head driving component is arranged in the housing and drives the toothbrush head (50) connected to its output shaft (101) to vibrate, the toothbrush head driving component also comprising a supporting end (102) and a triggering end (103), the supporting end (102) being connected to the motor supporting frame (20), and the triggering end (103) corresponding to the second pressing area (3B) of the PCB board (30); When the toothbrush head (50) is subjected to a force in the direction of the bristles, the toothbrush head driving component rotates relative to the motor support frame (20) around the support end (102) as a fulcrum, and the trigger end (103) of the toothbrush head driving component moves closer to or farther away from the second pressing area (3B), the second pressing area (3B) is deformed, and the second pressure sensing element outputs an electrical signal according to the deformation of the second pressing area (3B).
2. The electric toothbrush according to claim 1, characterized in that: The toothbrush head driving component comprises a motor (10), a front housing (11) connected to the motor (10) and a rear housing (12), wherein the front housing (11) is connected to the motor support frame (20) and serves as a support end (102), and the rear housing (12) is elastically connected to the motor support frame (20) and serves as a trigger end (103).
3. The electric toothbrush according to claim 2, characterized in that: The motor support frame (20) comprises a sleeve (21) matched with the front shell (11); the front shell (11) is assembled into the sleeve (21) along the axial direction of the motor (10), and the output shaft (101) passes through the sleeve (21) and extends to the outside of the sleeve (21); and when the toothbrush head is subjected to a force along the direction of the bristles, the motor (10) rotates with the contact part between the front shell (11) and the sleeve (21) as a fulcrum.
4. The electric toothbrush according to claim 3, characterized in that: The outer wall of the front housing (11) is provided with a raised rib (211) extending in the direction of the sleeve (21), so that the front housing (11) and the sleeve (21) are in contact through the raised rib (211), and the front housing (11) rotates relative to the sleeve (21) with the raised rib (211) as a fulcrum.
5. The electric toothbrush according to claim 2, characterized in that: The rear housing (12) is provided with a columnar portion (121) extending in the direction of a second pressing area (3B) of the PCB board (30), and the columnar portion (121) is configured to press the second pressing area (3B) with the movement of the rear housing (12).
6. The electric toothbrush according to claim 5, characterized in that: The rear housing (12) is also provided with an elastic reset structure, the two ends of which are respectively connected to the rear housing (12) and the supporting component, and the elastic reset structure is used to keep the columnar portion (121) restored to an initial position when the output shaft (101) is in a non-pressurized state.
7. The electric toothbrush according to any one of claims 1 to 6, characterized in that: The PCB board (30) is configured to isolate stresses from each other in the first pressing area (3A) and the second pressing area (3B).
8. The electric toothbrush according to claim 7, characterized in that: The first pressing area (3A) and the second pressing area (3B) are distributed along the length direction of the PCB board (30); along the length direction of the PCB board (30), two limiting grooves are provided on both sides of the first pressing area (3A); and the motor support frame (20) is provided with two limiting plates (22) adapted to the limiting grooves.
9. The electric toothbrush according to any one of claims 1 to 6, characterized in that: The first pressing area (3A) and the second pressing area (3B) are configured as stress concentration areas of the PCB board (30).
10. The electric toothbrush according to claim 9, characterized in that: The motor support frame (20) is also provided with a fastening portion (23), which is connected to the PCB board (30) and limits the displacement of the surrounding portion of the second pressing area (2B) of the PCB board (30) relative to the motor support frame (20).