Cleaning care appliance, and transducer and pressure alarm mechanism thereof

Abstract

The present invention provides a cleaning appliance, a transducer device and a pressure alarm mechanism thereof. The transducer device according to the present invention comprises a transducer, wherein the elastic assembly comprises at least one proximal elastic member and at least one distal elastic member, the proximal elastic member and the distal elastic member have a first edge and a second edge respectively, the first edge of the proximal elastic member and the distal elastic member is fixedly connected to the driving shaft to move with the driving shaft, and the second edge is the fixed edge when the proximal elastic member and the distal elastic member are elastically deformed, wherein the plane of the proximal elastic member forms a first angle with the median plane of the frame, and the plane of the distal elastic member forms a second angle with the median plane. By using the transducer device according to the present invention, the elastic members can be protected from failure, the volume of the transducer device can be reduced, and the elastic assembly can facilitate the implementation of the pressure alarm mechanism.

Description

Technical Field

[0001] This invention relates to the field of cleaning and care products technology, and more specifically, to a transducer and pressure alarm mechanism in cleaning and care products. Background Technology

[0002] For personal care products such as electric toothbrushes, electric shavers, electric facial cleansers, and electric showers, it is important that they have a transducer that can convert reciprocating motion into the desired rotational motion of the cleaning element. These personal care products should be simple in structure, easy to assemble, have a long service life, be safe and reliable, and be small in size.

[0003] Many drive structures are known for powering cleaning components, such as motors, magnetic systems, and electromagnetic systems. Some drive structures use bearings, such as ball bearings, to support the actuator. These structures are expensive and complex, and also generate noise and introduce motor damping issues.

[0004] The applicant holds another Chinese invention patent with authorization publication number CN104617732B, which discloses a personal cleaning and care device. Its transducer mechanism includes a drive shaft, transducer elastic elements fastened to the left and right supports of the drive shaft, at least two permanent magnets, corresponding permanent magnet supports for fixing the permanent magnets, left and right transducer transmission arms fixed to the permanent magnet supports and the drive shaft, and at least two left and right transducer elastic elements disposed on the left and right sides of the longitudinal axis of the drive shaft. The left and right permanent magnets are... The permanent magnets on one side are independent of each other. The magnetic poles of the permanent magnets on the other side are either S or N poles in the direction of the driving coil. The magnetic poles of the permanent magnets on the other side are opposite to the magnetic poles of the permanent magnets on the other side in the direction of the driving coil. The left and right permanent magnets are set such that the angle between the direction of their internal magnetic field lines and the direction of the longitudinal axis of the driving coil is greater than 45° and less than 135°, respectively. The left and right permanent magnets can move relative to the elastic fixing parts. When the driving coil is subjected to an alternating current I with a frequency of f0, the direction of movement of the left and right permanent magnets is approximately parallel to the direction of the longitudinal axis of the driving coil core.

[0005] In the above solution, the drive shaft does not require ball bearings. However, due to the limited ability of the elastic element to balance the pressure on the cleaning element, prolonged use can easily cause fatigue and yielding of the elastic element, thus affecting the transducer's lifespan. Furthermore, since the elastic element is fixedly connected to the corresponding transducer drive arm and the transducer elastic element fixing component, the overall size of the transducer is relatively large, which is not conducive to the miniaturization of cleaning tools. Therefore, improvements to existing personal hygiene and care tools are still necessary. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention proposes a personal hygiene and care device comprising: a transducer and a drive coil, wherein the transducer includes a transducer frame, a magnet attached to the transducer frame, an elastic component attached to the transducer frame, and a drive shaft; wherein the drive shaft has a proximal end and a distal end, and is fixed to the transducer frame, and the drive shaft defines a longitudinal axis extending through a mid-plane substantially perpendicular to the cleaning force on the hygiene and care device; and the drive coil is positioned relative to the magnet of the transducer. The transducer is movable relative to the drive coil, wherein the elastic component includes at least one proximal elastic element and at least one distal elastic element disposed offset along the longitudinal axis, the proximal elastic element being closer to the proximal end of the drive shaft than the distal elastic element, wherein the proximal elastic element and the distal elastic element each have a first edge and a second edge, the first edge being fixed to the drive shaft to move with the drive shaft, the second edge constituting a fixed edge for elastic deformation of the proximal elastic element and the distal elastic element, and the planes of the proximal elastic element and the distal elastic element respectively extending radially outward from the longitudinal axis.

[0007] According to a preferred aspect of the invention, the distance between the center lines of the widths of the proximal elastic element and the distal elastic element along the longitudinal axis is at least 3.5 mm.

[0008] According to a preferred aspect of the invention, the plane of the proximal elastic member forms a first angle with respect to the mid-plane, and the plane of the distal elastic member forms a second angle with respect to the mid-plane, wherein the first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees.

[0009] According to a preferred aspect of the invention, the proximal elastic element and the distal elastic element are located on opposite sides of the midline plane or on the same side of the midline plane, and the proximal elastic element and the distal elastic element are located on opposite sides or the same side of a vertical plane perpendicular to the midline plane P and including the longitudinal axis. Alternatively, the proximal elastic element and the distal elastic element are arranged along the direction of the vertical plane.

[0010] According to another preferred aspect of the invention, the proximal elastic element is made of plastic or metal, and the distal elastic element is made of plastic.

[0011] According to another preferred aspect of the invention, the proximal elastic elements are arranged in pairs symmetrically about the longitudinal axis, and the distal elastic elements are arranged in pairs symmetrically about the longitudinal axis.

[0012] According to another preferred aspect of the invention, the elastic component further includes at least one other elastic element, which is made of metal and is offset relative to the proximal and distal elastic elements along the longitudinal axis. The angle between the plane of the metal elastic element and the mid-plane is smaller than the angle between the planes of the proximal and distal elastic elements and the mid-plane. The total elastic modulus of the other metal elastic element is more than twenty times the total elastic modulus of the distal elastic element.

[0013] According to another preferred aspect of the invention, the transducer frame includes a transducer frame portion that encloses a drive shaft and a pair of frame fastening walls spaced radially from the drive shaft, wherein the frame fastening walls have an upper protrusion and a lower protrusion that are offsetly arranged on the frame fastening walls, a first edge fixed to the transducer frame portion, and a second edge fixed to the upper protrusion and the lower protrusion of the frame fastening walls, respectively.

[0014] The present invention also provides a pressure alarm mechanism for a cleaning and care appliance, comprising: a drive shaft defining a longitudinal axis and having a proximal end and a distal end, wherein a drive unit is attached to the distal end of a driven shaft to the drive shaft, wherein when a cleaning force F1 of the cleaning and care appliance is applied along a first direction, the proximal end generates a first displacement along the first direction; a proximal elastic member, wherein a first edge of the proximal elastic member is fixed to the drive shaft to move with the drive shaft, and the location of the proximal elastic member constitutes a fulcrum of the drive shaft; a distal elastic member, wherein the distal elastic member is offset distally relative to the proximal elastic member along the longitudinal axis, and a first edge of the distal elastic member is fixed to the drive shaft to move with the drive shaft, wherein when a cleaning force F1 is applied to the proximal end, the drive shaft at the location of the first edge of the distal elastic member generates a second displacement along a second direction opposite to the first direction; and a sensing device comprising a fixed part and a movable part, wherein the movable part is disposed on the drive unit, and when a cleaning force F1 is applied to the proximal end, the movable part generates a third displacement relative to the fixed part along the second direction; and when the cleaning force F1 exceeds the maximum pressure F1... M At that time, the displacement of the movable part relative to the fixed part causes the alarm device of the pressure alarm mechanism to generate an alarm indication.

[0015] According to another preferred aspect of the invention, the proximal elastic member and the distal elastic member each have a second edge opposite to the first edge, the second edge constituting a fixed edge for elastic deformation of the proximal and distal elastic members, wherein the distance between the center lines of the widths of the proximal and distal elastic members along their respective longitudinal axes is at least 3.5 mm. The plane of the proximal elastic member forms a first angle relative to the median plane (P), and the plane of the distal elastic member forms a second angle relative to the median plane. The first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees.

[0016] According to another preferred aspect of the invention, the longitudinal axis extends through a midline plane, and the midline plane is substantially perpendicular to the cleaning force. The plane of the proximal elastic member forms a first angle with respect to the midline plane P, and the plane of the distal elastic member forms a second angle with respect to the midline plane. The first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees. The proximal elastic member and the distal elastic member are located on opposite sides of the midline plane or on the same side of the midline plane. The proximal elastic member and the distal elastic member are located on opposite sides of the plane containing the cleaning force and the longitudinal axis or along the direction of the cleaning force.

[0017] According to another preferred aspect of the invention, the drive unit includes a magnet and a frame, the magnet being attached to the distal end of the drive shaft via the frame, and the movable part being further away from the proximal elastic member than the proximal end of the drive shaft.

[0018] According to another preferred aspect of the invention, the fixed component of the sensing device includes a sensing device and an emitting source, with a gap formed between the sensing device and the emitting source, and the movable component includes a blocking block movable into the gap between the sensing device and the emitting source, wherein the sensing device and the emitting source include at least one of an electrical, magnetic, and optical sensing device and an emitting source.

[0019] According to another preferred aspect of the invention, the sensing device and the emitting source are disposed on the circuit board or housing of the cleaning and care appliance, or on a part fixed relative to the housing. The part fixed relative to the housing includes circuit boards and battery compartment frames, etc.

[0020] According to another preferred aspect of the invention, the pressure alarm mechanism includes a pressure limiting part that limits the range of motion of the movable part, thereby limiting the maximum pressure F1 of the sensing device. M Within the range of 2.5N to 15N, the maximum pressure limiting part is provided on the housing of the cleaning and care appliance or on a part fixed relative to the housing.

[0021] In addition, the present invention also provides a cleaning and care appliance, which includes the above-mentioned transducer or pressure alarm mechanism, and includes one of an electric toothbrush, an electric shaver, an electric facial cleanser, and an electric shower.

[0022] Furthermore, according to the present invention, the drive coil is arranged so as to have no relative movement with respect to the housing of the cleaning and care appliance, and the drive coil is arranged in the magnetic field generated by the magnet, the magnetic field lines generated by the magnet and the direction of the current I in the drive coil are at an angle of approximately 90 degrees, and an alternating current I with a frequency of f0 passes through the drive coil, thereby the interaction between the drive coil and the magnet generates a reciprocating couple with the longitudinal axis of the drive shaft as the axis, and the reciprocating couple drives the transducer to resonate.

[0023] Furthermore, in the cleaning and care appliance according to the present invention, the transducer and the cleaning component of the cleaning and care appliance form a resonator, the drive coil and the magnet interact to generate a reciprocating couple with the longitudinal axis L2 of the drive shaft as the axis, the reciprocating couple drives the resonator to resonate, and the natural frequency fn of the resonator is between 85% and 115% of the frequency f0 of the reciprocating couple.

[0024] The transducer device according to the present invention solves the problem of fatigue and yielding of elastic elements, improves the service life of the transducer device, realizes the miniaturization of personal care products, and is easy to assemble, rotates smoothly, has low noise, low damping, and is safe and reliable. Furthermore, the pressure alarm mechanism can identify the magnitude of the pressure applied to the cleaning element. Attached Figure Description

[0025] To gain a more complete understanding of the invention, reference can be made to the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which:

[0026] Figure 1 A perspective view of a personal hygiene care appliance and its internal mechanism according to a first preferred embodiment of the present invention;

[0027] Figure 2 for Figure 1 An exploded view of the internal mechanism of the cleaning and care appliance shown, including the transducer.

[0028] Figure 3 This is a perspective view of a transducer according to a first preferred embodiment of the present invention;

[0029] Figure 4 This is a perspective view of a transducer according to a first preferred embodiment of the present invention, wherein the elastic component in the transducer is shown;

[0030] Figure 5 Two first elastic elements and drive shafts suitable for use according to a first embodiment of the present invention are shown;

[0031] Figure 6 Two first elastic elements suitable for a transducer according to a first embodiment of the present invention are shown;

[0032] Figure 7 A schematic end view showing the positional relationship between the cleaning element and the first and second elastic elements;

[0033] Figure 8 A simplified force diagram of the elastic member and cleaning assembly along the longitudinal axis according to a preferred embodiment of the present invention is shown;

[0034] Figure 9 A bottom perspective view of the transducer and circuit board according to a first embodiment of the present invention;

[0035] Figure 10 A perspective view of a transducer according to a second preferred embodiment of the present invention is shown;

[0036] Figure 11 for Figure 10 Another perspective view of the transducer in the image shows the drive coil;

[0037] Figure 12 This is a perspective view of a transducer according to a third embodiment of the present invention;

[0038] Figure 13 for Figure 12 Another perspective view of the transducer shown, in which the drive coil has been removed;

[0039] Figure 14 This is a perspective view of a transducer according to a fourth embodiment of the present invention;

[0040] Figure 15 for Figure 14 The diagram shown is a combination of a drive shaft, an elastic element, and a magnet in a transducer according to a fourth embodiment of the present invention.

[0041] Figure 16 For Figure 15 The diagram shown is a schematic representation of the elastic element in the transducer according to a fourth preferred embodiment of the present invention; and

[0042] Figure 17 This diagram shows the relationship between the support, elastic element, and cleaning element of the transducer device according to a fourth preferred embodiment of the present invention.

[0043] List of reference numerals

[0044] 1. Handle

[0045] 2 Cleaning Component Carrier

[0046] 3 Cleaning components

[0047] 4 Circuit Boards

[0048] 5 batteries

[0049] 7' transducers

[0050] 101 drive shaft

[0051] 102 First Magnet

[0052] 103 Second Magnet

[0053] 104 First elastic element

[0054] 104A First Elastic Component

[0055] 104B First Elastic Component

[0056] 105 Second elastic element

[0057] 105A Proximal Second Elastic Element

[0058] 105B Distal Second Elastic Element

[0059] 106 Edge of the first elastic element

[0060] 107 Edge of the first elastic element

[0061] 108 Edge of the second elastic element

[0062] 109 Edge of the second elastic element

[0063] 110 Transducer Rack

[0064] 111 Rack protrusion

[0065] 112-enveloping drive shaft transducer frame section

[0066] 113 Frame Fastening Arm

[0067] 114 Frame Follower Block

[0068] 115 Support Arm

[0069] 121 First driving coil

[0070] 122 Second drive coil

[0071] 131 Transducer upper housing

[0072] 132 Transducer lower casing

[0073] 133 Fastening screws

[0074] 134 Drive Coil Frame

[0075] 135 Battery Compartment

[0076] 202 Magnets

[0077] 203 Magnets

[0078] 221 drive coil

[0079] 204A, 204B First elastic element

[0080] 302 Cylindrical magnet

[0081] 321, 322, 323, 324 drive coils

[0082] 401 Photosensitive Element

[0083] 402 Light Source

[0084] 501 drive shaft

[0085] 502 First Magnet

[0086] 503 Second Magnet

[0087] 505A Proximal Elastic Component

[0088] 505B Remote Elastic Component

[0089] 508 Edge of elastic element

[0090] 509 Edge of elastic element

[0091] 510 transducer rack

[0092] 511 Rack protrusion

[0093] 512 Transducer frame section of the envelope drive shaft

[0094] 513 Frame Fastening Arm

[0095] L1 longitudinal axis of the cleaning element

[0096] L2 drive shaft longitudinal axis

[0097] L3 centerline of the proximal second elastic element

[0098] L4 Centerline of the second elastic element at the distal end

[0099] L5 centerline of the proximal elastic element

[0100] L6 centerline of the distal elastic element

[0101] The angles between the plane of the second elastic element and the longitudinal axis of the cleaning element (α1, α2, α3, α4)

[0102] The angles between the plane of the first elastic element and the longitudinal axis of the cleaning element (β1, β2, β3, β4).

[0103] δ1, δ2, δ3, δ4: Angles between the plane of the elastic element and the longitudinal axis of the cleaning element. Detailed Implementation

[0104] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0105] The following description uses an electric toothbrush as a typical example of a personal hygiene product, and describes exemplary embodiments of the invention in more detail with reference to the accompanying drawings. Although the following explanation uses only an electric toothbrush as an example, the invention is not limited thereto. The invention can also be applied to personal hygiene products such as electric shavers, electric facial cleansers, and electric showers that provide cleaning action through a transducer.

[0106] For clarity, this specification uses terms describing spatial relative positions, such as "up," "down," "left," "right," "near end," and "far end," to simply describe the relationship between one element or feature and another element (one or more) or feature (one or more) as shown in the figure. The direction of the longitudinal axis of the drive coil refers to the direction parallel to the magnetic field lines generated inside the iron core when current I flows through the drive coil. "Up" and "down" are relative to the longitudinal axis of the drive shaft; facing the corresponding view, "up" is defined as an upward direction parallel to the longitudinal axis of the drive shaft, and "down" is defined as a downward direction parallel to the longitudinal axis of the drive shaft. "Left" and "right" are relative to the longitudinal axis of the drive shaft; facing the corresponding view, "left" is defined as the left side of the longitudinal axis of the drive shaft in a direction perpendicular to the longitudinal axis of the drive shaft, and "right" is defined as the right side. "Near end / near side" refers to the end or side closest to the point where the cleaning force is applied when using the cleaning and care product. "Far end / far side" refers to the end or side furthest from the point where the cleaning force is applied when using the cleaning and care product.

[0107] Furthermore, the term “and / or” as used in this application includes any one and all combinations of the listed one or more associated terms.

[0108] Although the terms "first" and similar terms are used in this specification to describe multiple elements or components, these elements or components should not be limited by these terms. These terms are used only to distinguish one element or component from another and do not imply "order." Therefore, changing the ordinal numbers of the elements or components discussed below does not exceed the concept and scope of this invention.

[0109] Figure 1 and Figure 2Perspective views and exploded perspective views of a cleaning and care appliance according to a first preferred embodiment of the present invention are shown respectively. The cleaning and care appliance is described below using an electric toothbrush as an example. The electric toothbrush mainly includes a handle 1 and a cleaning component detachably mounted on the handle 1. The handle 1 includes a handle housing and various functional components mounted within the handle housing. The cleaning component of the electric toothbrush is in the form of a toothbrush head, which includes a cleaning element carrier 2 and cleaning elements 3 distributed on the cleaning element carrier 2. The toothbrush head carrier 2 is mounted to the handle 1, for example, by a snap-fit ​​connection. This snap-fit ​​connection allows the drive handle 1 and the cleaning component to be reliably connected together, and also allows for easy separation of the drive handle 1 and the cleaning component. The cleaning element 3 can be an object such as brush bristles.

[0110] The functional components in the handle 1 of the cleaning and care appliance mainly include a power supply section, a control section, a trigger section, and a transducer. The power supply section typically includes a rechargeable battery 5 and a charging circuit installed in the battery compartment 135, used to provide power to various parts of the appliance; the control section mainly includes a circuit board 4, used to control various operating modes of the electric toothbrush and to turn it on or off; the trigger section includes a switch, used to start and stop the operation of the electric toothbrush; and the transducer is configured to convert the input electrical energy into mechanical energy that provides reciprocating motion for the cleaning components.

[0111] Figure 2 , Figure 3 and Figure 4 A transducer device according to a first embodiment of the present invention is shown. The transducer device mainly includes a transducer 7, and a drive coil of the transducer device is arranged relative to the transducer 7. The transducer 7 mainly includes a transducer frame 110, a first magnet 102, a second magnet 103, a drive shaft 101 for detachably assembling a cleaning assembly, and an elastic component for inducing resonant motion.

[0112] Preferably, the transducer frame 110 is made of plastic. In the first embodiment, the first magnet 102 and the second magnet 103, which are part of the transducer 7, are fixed to the far end of the transducer frame 110 away from the cleaning element 3 by means of glue, screws or injection molding, so that the magnets 102 and 103 become part of the transducer 7 as a whole.

[0113] Preferably, the transducer also includes an upper transducer housing 131 and a lower transducer housing 132, which are fastened together, for example, by fastening screws 133, thereby pressing the frame fastening arm 113 of the transducer frame 110 between the two housings and correspondingly locking the transducer frame 110. The upper transducer housing 131 and the lower transducer housing 132 are further fastened to the outer casing of the appliance. However, it should be understood that in other alternative embodiments, the upper and lower transducer housings may also be integrally formed with the handle housing.

[0114] In the first preferred embodiment, such as Figure 4 As shown, the elastic assembly of transducer 7 includes four first elastic elements 104 and four second elastic elements 105. More specifically, as... Figure 4 As shown, along the drive shaft 101, the elastic assembly includes two first elastic elements 104A, two second elastic elements (proximal elastic elements) 105A, two second elastic elements (distal elastic elements) 105B, and two first elastic elements 104B in sequence from the proximal end to the distal end.

[0115] Each of the first elastic elements 104A and 104B is approximately a cuboid. The distance from the first elastic elements 104A and 104B at the frame fastening arm 113 to the transducer frame portion 112 is the length of the elastic element; the distance between the first elastic elements 104A and 104B along the longitudinal axis L2 of the drive shaft is called the width of the elastic element; the remaining side of the cuboid is the thickness of the elastic element; and the plane formed by the length and width of the first elastic elements 104A and 104B is the elastic element plane. Similarly, each of the second elastic elements 105 is approximately a cuboid. The distance from the second elastic elements 105A and 105B at the frame protrusion 111 of the frame fastening arm 113 to the transducer frame portion 112 is the length of the elastic element; the distance between the second elastic elements 105A and 105B along the longitudinal axis of the drive shaft is the width of the elastic element; and the remaining side of the cuboid is the thickness of the elastic element. The plane formed by the length and width of the second elastic elements 105A and 105B is the elastic element plane.

[0116] like Figure 7 As shown, four first elastic elements 104A and 104B are located in the same plane, which is situated in the mid-plane P of the transducer. For the transducer according to the invention, the mid-plane P is defined as the plane perpendicular to the direction of the cleaning force F1 and the longitudinal axis L2 of the drive shaft, with the cleaning force F1 and the longitudinal axis L2 of the drive shaft perpendicular. In an electric toothbrush, the direction of the cleaning force F1 is defined as the direction of the longitudinal axis L1 of the cleaning element 3; that is, the mid-plane P is substantially perpendicular to the longitudinal axis L1 of the cleaning element 3. Since the first elastic element 104 is located in the mid-plane P, the angle between the plane of the first elastic element 104 and the longitudinal axis L2 of the drive shaft is 0 degrees. More specifically, in the first embodiment, the angles between the elastic element planes of the first elastic elements 104A and 104B and the longitudinal axis L1 of the cleaning element are β1, β2, β3, and β4, respectively. Figure 7 In the embodiment shown, β1, β2, β3, and β4 are all equal to 90 degrees, and the longitudinal axis L1 of the cleaning element is perpendicular to the plane of the first elastic element. However, in other alternative embodiments, angles β1, β2, β3, and β4 may take other different values.

[0117] Furthermore, the second elastic element 105 of the elastic assembly includes a proximal elastic element 105A and a distal elastic element 105B arranged in pairs, with the two pairs of elastic elements offset along the longitudinal axis L2. The proximal elastic element 105A is closer to the proximal end of the drive shaft 101, while the distal elastic element 105B is closer to the distal end of the drive shaft 101. The plane of the second elastic element 105 is the plane connecting the frame protrusion 111 and the transducer frame portion 112 enveloping the drive shaft. Preferably, the angle between this plane and the midpoint plane containing the longitudinal axis L2 is greater than 30 degrees, and more preferably, the angle between this plane and the longitudinal axis L2 is less than 30 degrees.

[0118] Unlike the arrangement of the first elastic elements 104A and 104B within the mid-plane P, the four second elastic elements 105 are arranged at an angle relative to the mid-plane P. In other words, the four second elastic elements 105 are arranged at an angle relative to the plane containing the longitudinal axes L1 and L2 of the cleaning element 3. The proximal elastic element 105A and the distal elastic element 105B are arranged obliquely on opposite sides of the mid-plane P, as shown below. Figure 7 As shown, the proximal elastic element 105A is located on the upper side of the mid-plane P and is arranged at an angle relative to the mid-plane P, while the distal elastic element 105B is located on the lower side of the mid-plane P and is arranged at an angle relative to the mid-plane P.

[0119] like Figure 7 As shown, the four second elastic elements 105A and 105B are α1, α2, α3, and α4 relative to the longitudinal axis L1, respectively. To avoid transducer failure due to elastic element yielding, the angles α1, α2, α3, and α4 are less than or equal to 80 degrees and greater than or equal to 0 degrees; more preferably, the angles α1, α2, α3, and α4 are less than or equal to 60 degrees and greater than or equal to 0 degrees. Figure 7 In the first embodiment shown, angles α1, α2, α3, and α4 are all equal to 60 degrees. In other words, the angle between the planes of the four second elastic elements 105A and 105B and the median plane P is greater than or equal to 10 degrees and less than or equal to 90 degrees; more preferably, the angle between the planes of the second elastic elements 105A and 105B and the median plane P is greater than 30 degrees and less than or equal to 90 degrees. Figure 7 In the illustrated embodiment, the angle between the planes of the second elastic elements 105A and 105B and the mid-plane P is 30 degrees. It should be understood that in other alternative embodiments, angles α1, α2, α3, and α4 may take different values.

[0120] In the first embodiment, both the first elastic member 104 and the second elastic member 105 are fixed by the transducer frame 110. Specifically, as shown... Figure 4As shown, the transducer frame 110 includes a transducer frame portion 112 that encloses the drive shaft and two frame fastening arms 113 disposed radially away from the transducer frame portion 112. The frame fastening arms 113 are arranged in pairs on opposite sides of the longitudinal axis L2.

[0121] The edges 106 of the paired first elastic members 104 are respectively fixed to two frame fastening arms 113, and the other edge 107 of the first elastic member 104 is fixed to the transducer frame portion 112 that encloses the drive shaft, substantially corresponding to the position of the longitudinal axis L2. The first elastic members 104A and 104B extend between the frame fastening arms 113 and the transducer frame portion 112 adjacent to the longitudinal axis L2.

[0122] Similarly, the edges 109 of the second elastic members 105A and 105B are respectively fixed to the transducer frame portion 112 of the enveloping drive shaft, while the opposing edges 108 are fixed to the frame fastening arm 113. To achieve an angled arrangement of the relative mid-plane P of the second elastic members 105A and 105B, frame protrusions 111 protrude from opposite sides of the frame fastening arm 113. The frame protrusions 111 are part of the frame fastening arm 113; therefore, the frame protrusions 111 can also be understood as part of the transducer frame 110. The edges 108 of the second elastic members 105 are respectively fixed to a corresponding frame protrusion 111.

[0123] In other alternative embodiments, the frame protrusion 111 may not be provided. For example, the frame protrusion 111 may be replaced by a thicker frame fastening arm 113.

[0124] The two first elastic elements 104A and two first elastic elements 104B, which are staggered along the longitudinal axis L2 of the drive shaft, are both made of metal. Figure 5 and Figure 6 As shown, two first elastic elements 104A and 104B distributed along the longitudinal axis L2 of the drive shaft can form an integral first elastic element assembly, which is stamped from a single sheet of metal. Alternatively, it can be formed from two elastic element assemblies, each containing one elastic element 204A and one elastic element 204B. In other alternative embodiments, four independent elastic elements may be combined to form the first elastic element assembly. The various first elastic element assemblies described above can still be considered to consist of two independent first elastic elements 104A distributed along the longitudinal axis L2 of the drive shaft and two independent first distal elastic elements 104B distributed along the longitudinal axis L2 of the drive shaft.

[0125] More specifically, the proximal elastic element can be considered to include two independent second elastic elements 105A, while the distal elastic element includes two independent second elastic elements 105B. For example... Figure 4As shown, four frame protrusions 111 are distributed on the transducer frame 110. Each of the four frame protrusions 111 is fixedly connected to the other edge 108 of the corresponding second elastic members 105A and 105B. The other edge 109 of the second elastic members 105A and 105B is fixedly connected to the transducer frame portion 112 of the enveloping drive shaft. Thus, the second elastic members 105A and 105B extend between the frame protrusions 111 and the transducer frame portion 112 of the enveloping drive shaft.

[0126] like Figure 2 , Figure 3 , Figure 4 As shown, the first magnet 102 and the second magnet 103 of the transducer 7 are symmetrically distributed on the upper and lower sides of the longitudinal axis L2 of the drive shaft (the left and right sides are not matched; the magnets are arranged vertically, and the drive coils are arranged horizontally), that is, they are located above and below the center plane P, respectively. The first drive coil 121 and the second drive coil 122 are located on the left and right sides of the longitudinal axis L2 of the drive shaft, respectively. The first drive coil 121 and the second drive coil 122 are fixedly arranged relative to the handle housing, so that the drive coils 121 and 122 do not move relative to the handle housing. The magnetic poles of the first magnet 102 and the second magnet 103 face the first drive coil 121 or the second drive coil 122. The first magnet 102 and the second magnet 103 facing the same drive coil 121 or 122 have opposite magnetic poles, such as... Figure 4 As shown, the magnetic pole of the first magnet 102 facing the second drive coil 122 is the S pole, and the magnetic pole of the second magnet 103 facing the second drive coil 122 is the N pole. The direction of the current I in the first drive coil 121 and the second drive coil 122 is perpendicular to the direction of the magnetic field lines inside the first magnet 102 and the second magnet 103.

[0127] The following is a motion analysis based on the transducer according to the first embodiment of the present invention.

[0128] See Figures 1 to 4When the user triggers the power button on the electric toothbrush, the circuit board 4 in the handle 1 activates the drive coils 121 and 122. An alternating current I with a frequency of f0 flows through the first drive coil 121 and the second drive coil 122. The direction of the current I in the first drive coil 121 is opposite to the direction of the current I in the second drive coil 122; if the direction of the current I in the first drive coil 121 is clockwise, then the direction of the current I in the second drive coil 122 is counterclockwise. The first magnet 102 and the second magnet 103, facing the same drive coil, have opposite magnetic poles. There is no relative movement between the first drive coil 121, the second drive coil 122, and the handle housing. The magnetic field formed by the first magnet 102 and the second magnet 103 interacts with the energized first drive coil 121 and the second drive coil 122 to generate an electromagnetic force. The electromagnetic forces acting on the first magnet 102 and the second magnet 103 are equal in magnitude and opposite in direction, resulting in a balanced electromagnetic force on the transducer 7. However, since the first magnet 102 and the second magnet 103 are respectively distributed on the upper and lower sides of the longitudinal axis L2 of the drive shaft, the electromagnetic force generates an electromagnetic torque M1 on the transducer 7. Because the current I flowing through the first drive coil 121 and the second drive coil 122 is alternating, the direction of the electromagnetic torque M1 on the transducer 7 is also correspondingly alternating, and the transducer 7 bears the reciprocating torque from the drive coils 121 and 122. Thus, there are electromagnetic forces on both sides of the longitudinal axis L2 of the drive shaft, and the elastic elements 104 and 105 are the main components bearing these electromagnetic forces. Assume that in the initial state, the direction of the electromagnetic torque M1 of the transducer is counterclockwise. The electromagnetic torque M1 of the transducer causes the elastic elements 104A and 104B and the second elastic elements 105A and 105B to undergo bending elastic deformation. At this time, the edges of the first elastic elements 104A and 104B fixed to the frame fastening arm 113 are fixed or stationary ends. In order for the first elastic element 104A to undergo reciprocating bending elastic deformation under the action of the electromagnetic torque M1, causing the transducer 7 and the cleaning assembly to resonate, the angle between the elastic element plane and the mid-plane P of the first elastic elements 104A and 104B is less than 30 degrees. The second elastic elements 105A and 105B also undergo reciprocating bending elastic deformation under the action of the electromagnetic torque M1, causing the transducer 7 and the cleaning assembly to resonate. Thus, the second elastic elements 105A and 105B are fixed to the edge 109 of the drive shaft 101 as the movable end or resonant end of the elastic deformation, while the second elastic elements 105A and 105B are fixed to the edge 108 of the frame protrusion 111 as the fixed end or stationary end of the elastic deformation.

[0129] In the first embodiment, the elastic elements 104A and 104B are made of metal or are mainly composed of metal, the second elastic element 105A can be made of plastic or metal, and the second elastic element 105B is made of plastic or is mainly composed of plastic components. In this invention, for ease of description, it is generally stated that the elastic element is metal or plastic, but it should be understood that the elastic element can be a composite of metal and plastic. When more than 60% of the stiffness coefficient of the elastic element comes from metal, the elastic element is said to be mainly composed of metal; when more than 60% of the stiffness coefficient of the elastic element comes from plastic, the elastic element is said to be mainly composed of plastic. When neither the stiffness coefficient contributed by metal nor plastic exceeds 60% of the stiffness coefficient of the elastic element, the elastic element is a composite of metal and plastic.

[0130] The material of the second elastic element 105 is plastic or mainly composed of plastic, such as Figure 4 As shown, the widths of the second elastic members 105A and 105B are set to be larger than the widths of the first elastic members 104A and 104B.

[0131] The following analysis will take the elastic component materials 105A and 105B, both of which are plastic, as examples.

[0132] According to the principles of solid mechanics, under the state of elastic deformation in bending, the elastic element is equivalent to a linear spring. Taking a cuboid elastic element as an example, the equivalent linear spring constant of the elastic element is:

[0133] K = 3 * E * I z / (a 3 ),

[0134] Where E is the elastic modulus of the material, and I z Let 'a' be the moment of inertia of the elastic element corresponding to the driving force or driving torque, and let 'a' be the distance from the point of application of the driving force on the elastic element to the edge 106 of the elastic element 104 or the edge 108 of the elastic element 105 when the elastic element is stationary relative to the handle housing. The 'a' for the first elastic elements 104A and 104B is designated as 'a1', and the 'a' for the second elastic elements 105A and 105B is designated as 'a2'. The spring stiffness coefficient corresponding to the first elastic elements 104A and 104B is designated as 'K1', and the spring stiffness coefficient corresponding to the second elastic elements 105A and 105B is designated as 'K2'.

[0135] In the first embodiment, preferably, the elastic modulus E1 of the materials of the first elastic elements 104A and 104B is greater than 20 times the elastic modulus E2 of the materials of the second elastic elements 105A and 105B. For example, if the materials of the first elastic elements 104A and 104B are stainless steel, the elastic modulus E1 is 196 GPa, and the materials of the second elastic elements 105A and 105B are POM, the elastic modulus E2 is 2.5 GPa. The moment of inertia of the first elastic elements 104A and 104B relative to the electromagnetic torque M1 is the moment of inertia I of the first elastic element. Z1 The moments of inertia of the second elastic elements 105A and 105B relative to the electromagnetic torque M1 are the moments of inertia of the second elastic elements I. Z2 According to solid mechanics, the moment of inertia of a cuboid is:

[0136] I Z = b*h*h*h / 12,

[0137] Where b is the width of the elastic element and h is the thickness of the elastic element. In the first embodiment, preferably, the moment of inertia I of the first elastic elements 104A and 104B is... Z1 In the figure, b is 1.3 mm, and the moment of inertia I of the second elastic elements 105A and 105B is... Z2 In the figure, b is 3.5mm, and the moment of inertia I of the first elastic elements 104A and 104B is... Z1 h is 0.16 mm, and the moment of inertia I of the second elastic elements 105A and 105B is... Z2 h is 0.3 mm. (Reference) Figure 7 The second elastic element 105B in the upper left corner and Figure 7 The first elastic element 104B on the left, and the second elastic element a2*cos(β1-α1) are greater than or equal to the first elastic element a1. In the first embodiment, β1 is 90 degrees and α1 is 60 degrees. Obviously, the angle of the plane of the first elastic element relative to the longitudinal axis L1 of the cleaning element is angle β. The angle of the plane of the second elastic element relative to the longitudinal axis of the cleaning element is angle α. Angle β1 is greater than angle α1. The edge 107 of the first elastic element is fixed to the transducer frame portion 112 of the envelope drive shaft, the other edge 106 of the first elastic element is fixed to the frame fastening arm 113, the edge 109 of the second elastic element is fixed to the transducer frame portion 112 of the envelope drive shaft, and the other end of the second elastic element is fixed to the frame protrusion 111, thereby ensuring that the a2 of the second elastic element is greater than the a1 of the first elastic element. After calculation, the E1*I of the first elastic element z1 / (a1 3 E2*I is greater than that of the second elastic element. z2 / (a2 3The stiffness coefficient of the first elastic element, K1, is 6.8 times greater than that of the second elastic element, K2. In the first embodiment, the equivalent mass of the vibrating body composed of the transducer 7 and the cleaning assembly relative to the longitudinal axis L2 of the drive shaft is M. m The natural frequency of the vibrating body is f. n ,but

[0138] 2*3.

[0139] Where K n Add the stiffness coefficients of all second elastic elements to the sum of the stiffness coefficients of all first elastic elements. The sum of the stiffness coefficients of the first elastic elements is K. 1t The sum of the stiffness coefficients of the second elastic element is K. 2t .

[0140] When the driving frequency f0 is equal to the mechanical natural frequency f n At this time, the mechanical parts are in forced resonant motion. When the drive coil carries an alternating current I with a frequency of f0, the transducer 7 and the cleaning component are subjected to an electromagnetic force with a frequency of f0. The frequency of the driving force f0 is between the natural frequency f of the transducer 7. n Between 85% and 115%. According to the principle of simple harmonic motion, the frequency f0 of the driving force is usually between the mechanical natural frequency f0 and f0. n When the temperature is between 85% and 115%, the mechanical part can be considered to be in forced resonant motion. The electrical energy of resonant and resonant motion is converted into mechanical energy with high efficiency. During the resonant motion of transducer 7 and cleaning component, the elastic element consumes a portion of energy due to the internal forces of the material, which is equivalent to the energy consumed by the internal resistance of the material. This energy is manifested as the heating of the elastic element material, and the smaller the elastic modulus, the greater the internal resistance and the higher the temperature rise. Therefore, the first elastic elements 104A and 104B are mainly made of metal and have a high elastic modulus, while the second elastic elements 105A and 105B are mainly made of plastic and have a lower elastic modulus. The heat dissipation effect of metal material is much better than that of plastic material. During the resonant motion of transducer 7 and cleaning component, the temperature rise of the first elastic elements 104A and 104B is much lower than that of the second elastic elements 105A and 105B. The increase in temperature will cause the elastic modulus of the elastic element material to decrease, thereby reducing the stiffness coefficient of the elastic element. In embodiments where the second elastic elements 105A and 105B are made of plastic, the temperature rise of the first elastic elements 104A and 104B has a limited effect on the stiffness coefficient of the first elastic elements, and can therefore be ignored. However, the temperature rise of the second elastic elements 105A and 105B has a greater effect on their stiffness coefficient. To ensure that the transducer 7 and the cleaning assembly remain in a resonant state throughout the working cycle, based on the above formulas and principle analysis, it is assumed that the angle coefficients of the second elastic elements 105A and 105B decrease to zero due to the temperature rise. When (K...1t +K 2t ) 2 / (K 1t ) 2 When K < 1.15 / 0.85, 1t >6.13K 2t During this period, the transducer 7 and the cleaning assembly remain in a resonant state throughout the operating cycle. The spring stiffness coefficients at the natural frequencies of the transducer 7 and the cleaning assembly primarily depend on the stiffness coefficients of the first elastic elements 104A and 104B. In the first embodiment, the sum of the stiffness coefficients of all the first elastic elements is greater than 6.13 times the sum of the stiffness coefficients of all the second elastic elements, thereby ensuring that the transducer remains in a highly efficient resonant state throughout the operating cycle.

[0141] In other alternative embodiments, the proximal elastic element 105A may be made of metal or primarily metal, and the distal elastic element 105B may be made of plastic or primarily plastic. Furthermore, the sum of the stiffness coefficients of all first elastic elements plus the sum of the stiffness coefficients of all proximal second elastic elements is greater than 6.13 times the sum of the stiffness coefficients of all second lower elastic elements. In this case, the first elastic elements 104A and 104B are made of metal, the second elastic element 105B is made of plastic, and the elastic modulus of the first elastic elements 104A and 104B is more than 20 times the elastic modulus of the second elastic element 105B. The angle of the first elastic element plane relative to the longitudinal axis of the cleaning element is angle β. The angle of the second elastic element plane relative to the longitudinal axis of the cleaning element is angle α, and angle β is greater than angle α.

[0142] Figure 8 A simplified force diagram of the elastic member and cleaning assembly along the longitudinal axis according to a preferred embodiment of the present invention is shown. Figure 8As shown, the pressure F1 applied to the cleaning element 3 has an equivalent force F2 on the second elastic member 105A and an equivalent force F3 on the second elastic member 105B. The pressure F1 applied to the cleaning element 3 is approximately parallel to the longitudinal axis L1 of the cleaning element. In this invention, the planes of the second elastic members 105A and 105B form an angle α of less than 80 degrees with respect to the longitudinal axis L1 of the cleaning element, specifically 60 degrees. When pressure F1 is applied to the cleaning element 3, the second elastic elements 105A and 105B generate a component force parallel to the longitudinal axis L1 of the cleaning element. Since the edges 109 of the second elastic elements 105A and 105B are fixed to the transducer frame portion 112, and the other edge 108 is fixed to the frame protrusion 111, according to the principles of torque balance and force balance, the direction of the equivalent force F2 on the second elastic element 105A is opposite to the direction of pressure F1, and the direction of the equivalent force F3 on the second elastic element 105B is the same as the direction of pressure F1. The second elastic element 105A is in a stretched state to generate the equivalent force F2, and the second elastic element 105B is in a stretched state to generate the equivalent force F3. In addition, the component force of pressure F1 perpendicular to the plane of the second elastic elements 105A and 105B causes pressure bending deformation of the second elastic elements. This pressure bending deformation will further increase the internal stress of the second elastic elements, which may cause the second elastic elements to yield, thereby causing a drastic change in the natural frequency of the transducer 7 and causing the transducer to fail. In this invention, the angle α is less than 80 degrees and greater than or equal to 0 degrees. More preferably, the angle α is less than or equal to 60 degrees and greater than or equal to 0 degrees, thereby effectively reducing the component of pressure F1 in the plane perpendicular to the second elastic members 105A and 105B, thereby reducing the pressure bending deformation of the second elastic members 105A and 105B caused by pressure F1.

[0143] Importantly, the inventors discovered that the distance between the equivalent force F2 on the second elastic element 105A and the equivalent force F3 on the second elastic element 105B is particularly important for torque balance. After extensive experiments and considering the feasibility of the manufacturing process, along the longitudinal axis L2 of the drive shaft, the distance between the centerline L3 of the second elastic element 105A and the centerline L4 of at least one second elastic element 105B is more than 3.5mm. The centerline is the centerline of the second elastic element plane located on the plane of the second elastic elements 105A and 105B and pointing from the frame protrusion 111 to the transducer frame portion 112 enveloping the drive shaft. It can also be understood that the centerline is the centerline of the second elastic element plane located on the plane of the second elastic elements 105A and 105B and pointing from the transducer frame 110 to the transducer frame portion 112 enveloping the drive shaft. Since the centerline L3 of at least one proximal second elastic element is more than 3.5 mm away from the centerline L4 of at least one distal second elastic element, it is more effective in avoiding torsional deformation of the second elastic element 105 caused by the pressure F1 on the cleaning element 3 compared to having only one second elastic element 105A, thus avoiding excessive stress on the second elastic element and preventing the failure of the transducer 7.

[0144] Continue to refer to Figure 8 , Figure 9 , Figure 10 In this invention, the tension or compression of the materials of the second elastic member 105A and the second elastic member 105B can balance the cleaning element pressure F1 and the torque M generated by the cleaning element pressure F1. F The second elastic element 105A at the proximal end corresponds to point O1 on the drive shaft 101 as the point of application of the force, and the torque M generated by the cleaning element pressure F1 is... F M is the torque formed by the pressure F1 of the cleaning element relative to point O1. F The direction is clockwise. Figure 8 In the force analysis and torque balance, the materials of the second elastic element 105A and the second elastic element 105B are stretched. The stretch distance of the second elastic element 105A is Y1, and the stretch distance of the second elastic element 105B is Y2. According to Hooke's Law, Y2 is proportional to (F3 / E), and the equivalent force F3 on the second elastic element 105B has a balancing torque M. F The function of the second elastic element 105B is defined by E, where E is the elastic modulus of the material of the second elastic element 105B. In this invention, the material of the second elastic element 105B is plastic, and the material of the first elastic element 104 is metal. The elastic modulus of the first elastic element 104 is more than twenty times that of the second elastic element 105B. Because this invention creatively introduces a plastic second elastic element 105B, according to Y2 proportional to (F3 / E), under the same F3 conditions and the same cleaning element pressure F1, the plastic second elastic element 105B, compared to the metal second elastic element 105B, can produce a stretching distance Y2 that is more than 20 times greater than that of the metal second elastic element 105B.

[0145] In other alternative embodiments, the second elastic elements 105A and 105B can be rotated 180 degrees about the longitudinal axis L2 of the drive shaft, then Y2 becomes the compression distance of the material of the second elastic element 105B. Therefore, Y2 is the distance of stretching or compression of the material of the second elastic element 105B.

[0146] Advantageously, the drive shaft based on the proximal elastic element 105A, the distal elastic element 105B, and the transducer frame can constitute a pressure alarm mechanism for an electric toothbrush, configured to issue an alarm when the cleaning force applied to the brush head exceeds a predetermined value. The pressure alarm mechanism includes a sensing device comprising at least one movable part disposed on a magnet at the distal end of the drive shaft or on the transducer frame, preferably disposed along the longitudinal axis L2 at the distal end of the magnet or the distal end of the transducer frame. When a cleaning force F1 is applied to the proximal end, the movable part generates a third displacement Y3 in a second direction. When the cleaning force F1 exceeds the maximum pressure F1... MAt that time, the displacement of the movable part causes the alarm device of the pressure alarm mechanism to generate an alarm indication.

[0147] Combination Figure 8 For example, under the action of the cleaning element pressure F1, the second elastic member 105B and the drive shaft portion at that position will generate a displacement Y2 opposite to the direction of the cleaning element pressure F1. The transducer frame 110 portion and the magnet, which are further away from the cleaning element 3 relative to the second elastic member 105A, will generate a displacement Y3 opposite to the direction of the cleaning element pressure F1 under the action of the cleaning element pressure F1. Since the second elastic member 105B and the second elastic member 105A are fixed to the transducer frame portion 112 that encloses the drive shaft, the displacement Y3 is proportional to the displacement Y2.

[0148] In the first embodiment, as Figure 4 As shown, the movable part includes a frame follower block 114 arranged at the rear of the transducer frame 110 away from the cleaning element 3. The frame follower block 114 is convex in shape. Under the action of the cleaning element pressure F1, the second elastic element 105B is in an elastic deformation state, and the frame follower block 114 generates a displacement Y3 opposite to the direction of the cleaning element pressure F1. The displacement Y3 increases as the cleaning element pressure F1 increases. The circuit board 4 has sensors such as an LED light source 402 and a photosensitive device 401 arranged on both sides near the frame follower block 114. When the light flux received by the photosensitive device 401 changes, the equivalent resistance of the photosensitive device 401 also changes accordingly. The circuit board 4 senses the change of pressure F1 by detecting the magnitude of the equivalent resistance of the photosensitive device 401. When the user increases the pressure F1 applied to the cleaning element 3, the displacement Y3 of the follower block 114 of the frame increases, and the follower block 114 of the frame enters the gap between the light source 402 and the photosensitive device 401 more closely. The light flux received by the photosensitive device 401 from the light source 402 decreases accordingly, and the equivalent resistance of the photosensitive device 401 increases. The circuit board 4 detects the increase in the equivalent resistance of the photosensitive device 401, thereby recognizing the increase in the pressure F1 of the cleaning element. When the pressure F1 of the cleaning element reaches the preset threshold, the electric toothbrush can remind the user that the pressure F1 on the cleaning element is too high by means of sound, light, vibration, etc., and remind the user to reduce the pressure F1 applied to the cleaning element. Similarly, when the user reduces the pressure F1 applied to the cleaning element 3, the displacement Y3 of the frame follower block 114 decreases, the frame follower block 114 reduces the gap between the light source 402 and the photosensitive device 401, the light flux that the photosensitive device 401 can obtain from the light source 402 increases accordingly, the equivalent resistance of the photosensitive device 401 decreases, the circuit board 4 detects the decrease in the equivalent resistance of the photosensitive device 401, and realizes the recognition that the pressure F1 of the cleaning element has increased. When the pressure F1 of the cleaning element is less than the preset excessive pressure threshold, the electric toothbrush stops the reminders in the form of sound, light, vibration, etc.

[0149] In an embodiment of the invention, the displacement Y3 is effectively amplified by the introduction of a lower second elastic member 105B made of plastic or mainly plastic, that is, the displacement of the transducer frame 110 portion and the magnet, which are further away from the cleaning element 3 relative to the second elastic member 105A, is effectively amplified under the action of the cleaning element pressure F1, which is opposite to the direction of the cleaning element pressure F1.

[0150] The implementation of the alarm mechanism can be modified appropriately. For example, a through hole can be provided on the frame follower block 114. When the cleaning element pressure F1 is zero, the light from the light source 402 does not pass through the through hole of the frame follower block 114 and is incident on the photosensitive surface of the photosensitive device 401, and the rest of the frame follower block 114 blocks the light from the light source 402 from being incident on the photosensitive surface of the photosensitive device 401. At this time, the equivalent resistance of the photosensitive device 401 is relatively large. When the cleaning element pressure F1 increases, more light from the LED 402 passes through the through hole of the frame follower block 114 and is incident on the photosensitive surface of the photosensitive device 401. At this time, the equivalent resistance of the photosensitive device 401 decreases, thereby realizing the detection of the magnitude of the cleaning element pressure F1 by the circuit board 4.

[0151] In the above embodiment, the frame follower block 114 is convex relative to the magnet surface. Of course, the frame follower block 114 can be concave, planar, or curved. By utilizing the displacement Y3 of one of its surfaces, at least one surface of the follower block 114 is brought closer to or further away from the photosensitive device 401, so that the incident angle of the light received by the photosensitive device 401 from the light source 402 changes, thereby causing the luminous flux on the photosensitive device 401 to change monotonically with the monotonically changing pressure F1 of the cleaning element.

[0152] Magnets can also be used as movable parts of the sensing device. By utilizing the displacement Y3 of the magnet away from the cleaning element, a magnetic field sensing device such as a Hall element or a coil can be installed on the circuit board 4. The displacement Y3 of the magnet causes a change in the magnetic field strength on the magnetic field sensing device, thereby forming a change in the voltage value of the magnetic field sensing device, thus realizing the detection of the pressure F1 of the cleaning element by the circuit board 4.

[0153] Furthermore, preferably, the transducer is configured to have an activation pressure F4. Specifically, springs can be pre-tensioned on the transducer frame 110 portion and the magnet, which are further away from the cleaning element than the second elastic element 105A. Displacements Y2 and Y3 can only be generated by the proximal and distal second elastic elements when the cleaning element pressure F1 is greater than the cleaning element activation pressure F4.

[0154] As the pressure F1 increases, the forces F2 and F3 on the elastic element also increase. These increased forces cause the second elastic element to yield and lose its elasticity. In this invention, the transducer also includes a mechanism to limit the pressure F1 to its maximum value.M The maximum pressure limiting part, i.e., the transducer, is configured to have a maximum pressure F1. M .exist Figure 9 In this embodiment, a through hole 403 is provided on the circuit board, allowing the frame follower block 114 to pass through and contact the handle housing. When the pressure F1 on the cleaning element 3 is greater than or equal to the maximum pressure F1 of the cleaning element... M At this time, the frame follower block 114 contacts the handle housing, which constitutes the maximum pressure limiting part. This limits further movement of the frame follower block 114, preventing displacements Y2 and Y3 from increasing further, thus ensuring that the second elastic element remains within the range of elastic deformation. Only when the pressure F1 is less than the maximum pressure F1... M Furthermore, when the pressure is greater than the starting pressure F4 of the cleaning element, the displacements Y2 and Y3 change monotonically as the pressure F1 changes monotonically.

[0155] For electric toothbrushes, ideally, the maximum pressure F1 of the cleaning element... M The range is 2.5N to 10N, and the starting pressure F4 of the cleaning element is greater than or equal to 0N and less than or equal to 2N. As the pressure F1 on the cleaning element exceeds the maximum pressure F1 of the cleaning element... M As the displacement Y2 and displacement Y3 continue to increase monotonically, the handle housing or the part that is stationary relative to the handle housing constrains the transducer 7, so that the displacements Y2 and Y3 no longer change monotonically.

[0156] Based on the resonance and mechanical analysis above, the pressure F1 on the cleaning element 3 causes additional bending deformation of the first elastic elements 104A and 104B. However, since the present invention introduces the second elastic elements 105A and 105B to balance the force and torque caused by the pressure F1 on the cleaning element 3, the additional bending deformation of the first elastic elements 104A and 104B caused by the pressure F1 on the cleaning element 3 is greatly reduced. This allows the transducer 7 to operate in a resonant state for a long lifespan. Furthermore, the second distal elastic element 105B has a limited impact on the spring stiffness coefficient in the transducer's natural frequency, making frequency adjustment of the transducer 7 easier. The first elastic elements 104A and 104B and the second elastic elements 105A and 105B can be manufactured using injection molding, making the transducer 7 easy to manufacture.

[0157] As a variation of the first embodiment, there may be only one first elastic member, such as only one... Figure 4 The first elastic element 104A is located above the left side of the drive shaft, or there is only one. Figure 4 The first elastic element 104B is located below the right side of the drive shaft. One first elastic element can still meet the above requirements for the combination of first elastic elements, and one first elastic element can still achieve the purpose of the present invention.

[0158] As another variation of the first embodiment, there may be only two second elastic elements, including one second elastic element 105A and one second elastic element 105B. For example, if there is only one... Figure 4 The second elastic element 105A, located on the left side of the drive shaft, has only one component. Figure 4 The second elastic element 105B is located to the right of the drive shaft. The two second elastic elements are respectively located on both sides of the mid-plane P, and also on both sides of a vertical plane perpendicular to the mid-plane P and including the longitudinal axis L2. The elastic assembly of one second elastic element 105A and one second elastic element 105B can still satisfy the requirements of the present invention for the combination of second elastic elements and achieve the purpose of the present invention.

[0159] In other variations, the second elastic element may be located on the same side of the mid-plane P, or on the same side of a vertical plane perpendicular to the mid-plane P and including the longitudinal axis L2.

[0160] Figure 10 and Figure 11 A perspective view of a transducer according to a second embodiment of the present invention is shown, wherein the magnet coil mechanism of the transducer has a different structure from the magnet coil mechanism in the first embodiment. Figure 10 , Figure 11 The drive coil 221 is centrally located relative to the longitudinal axis L2 of the drive shaft. Magnets 202 and 203 are distributed on both sides of the drive coil 221. The transducer frame 110 extends to both sides and downwards from the longitudinal axis L2 of the drive shaft to form two support arms 115. The two magnets are respectively fixed to their respective support arms 115. The magnetic field generated by the magnets passes through the drive coil. Through an analysis similar to the one above, such as... Figure 10 , Figure 11 The arrangement of magnets 202 and 203 and drive coil 221 shown can still achieve the purpose of this invention.

[0161] Figure 12 and Figure 13 A perspective view of a transducer according to a third embodiment of the present invention is shown. (See reference...) Figure 12 , Figure 13 A hollow cylindrical magnet 302 is fastened to the drive shaft 101. Drive coils 321, 322, 323, and 324 are arranged around the outside of the hollow cylindrical magnet. The magnetic field generated by the magnet passes through the drive coils. Similar to the analysis above, as... Figure 12 , Figure 13 The arrangement of the magnets and drive coils shown can still achieve the purpose of this invention.

[0162] Of course, the positions of the magnet and drive coil relative to the cleaning element 3 can be varied, for example, the magnet and drive coil can be closer to the cleaning element 3, or the magnet and drive coil can be located between the two second elastic elements.

[0163] In existing transducer devices for cleaning appliances, the fixed end or stationary end of the elastic element is located on the longitudinal axis of the drive shaft, a cn The distance from the driving force to the longitudinal axis of the driving shaft is also 'a' in the formula for calculating the stiffness coefficient of the elastic element, and the torque of the driving force is the driving force multiplied by 'a'. cn And to maintain a small driving force while ensuring sufficient torque, a cn It needs to be large enough. To maintain a suitable stiffness coefficient, the size of the elastic element needs to be slightly larger. Furthermore, since the other end of the elastic element needs to be fixed to the transducer drive arm, existing transducer devices all have relatively large dimensions.

[0164] In this embodiment, the first elastic element 104 thus bears the electromagnetic torque M1 on the drive shaft. Two frame fastening arms 113 are distributed on the transducer frame 110. Each frame fastening arm 113 is fixed to the other edge 106 of the corresponding first elastic element 104A and 104B. The edges 107 of the first elastic elements 104A and 104B are fixed to the transducer frame portion 112, which encloses the drive shaft. The first elastic elements 104A and 104B extend between the frame fastening arms 113 and the transducer frame portion 112 enclosing the drive shaft. The distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first elastic element is 'a' in the elastic element stiffness coefficient calculation formula. The distance from the longitudinal axis L2 of the drive shaft to the other end 106 of the first elastic element is not directly related to the lever arm of the electromagnetic couple M1. Therefore, the distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first elastic element can be small enough, the size of the elastic element can be smaller, and the overall size of the transducer 7 can be smaller, thereby achieving miniaturization of the cleaning device.

[0165] In the first embodiment, when the transducer 7 is in a resonant state, the second elastic element 105A and the plastic second elastic element 105B are staggered along the longitudinal axis L2 of the drive shaft to amplify the displacement Y3 caused by the pressure F1 of the cleaning element, thereby enabling the detection of the pressure F1 of the cleaning element. Detection of the pressure F1 of the cleaning element is necessary in some cleaning appliances, such as electric toothbrushes, where excessive pressure F1 can damage the gums, thus requiring the user to be alerted to the magnitude of the pressure F1. However, in other applications, the need for detecting the pressure F1 of the cleaning element is not strong, but it is desirable that the pressure F1 on the cleaning element be greater within the resonant range of the transducer and cleaning assembly. Therefore, this invention provides another solution, replacing the material of all the second elastic elements in the above embodiment with metal, i.e., as shown in the figure. Figure 14 , Figure 15 , Figure 16 , Figure 17 The fourth embodiment of the transducer is shown.

[0166] In the fourth embodiment, the transducer 7' includes a drive shaft 501, two proximal elastic elements 505A distributed along the longitudinal axis L2 of the drive shaft, two distal elastic elements 505B distributed along the longitudinal axis L2 of the drive shaft, magnets 502 and 503, and a transducer frame 510. Both magnets 502 and 503 are fixed to the transducer frame 510. The transducer frame 510 is made of plastic. The drive shaft 501, proximal elastic elements 505A, and distal elastic elements 505B are connected together via the transducer frame 510. Magnets 502 and 503 are fixed to the tail of the transducer frame away from the cleaning element by glue, screws, or injection molding.

[0167] In the fourth embodiment, the elastic component of the transducer 7' should include at least one proximal elastic element 505A and one distal elastic element 505B, and a second proximal elastic element 505A and a second distal elastic element 505B are respectively located on opposite sides of the mid-plane P where the longitudinal axis L2 of the drive shaft is located. The proximal elastic element 505A and the distal elastic element 505B distributed on both sides of the mid-plane P can withstand the electromagnetic forces from both sides of the longitudinal axis L2 of the drive shaft, thereby balancing the forces on the transducer and reducing noise and impact.

[0168] In the fourth embodiment of the present invention, the transducer 7' is provided with two proximal elastic elements 505A and two distal elastic elements 505B. The proximal elastic elements 505A and the distal elastic elements 505B have different tilt angles and are staggered along the longitudinal axis L2. The proximal elastic element 505A is closer to the proximal end of the drive shaft 501 than the distal elastic element 505B.

[0169] Similar to the structure in the first embodiment, the transducer frame 510 includes a frame portion 512 that envelops the drive shaft and a frame fastening arm 513, with a frame protrusion 511 protruding from the frame fastening arm 513. A proximal elastic element 505A and a distal elastic element 505B are respectively fixedly connected to the frame protrusion 511 and the frame portion 512 that envelops the drive shaft.

[0170] like Figure 15As shown, four frame protrusions 511 are distributed on the transducer frame 510. Each of the four frame protrusions 511 is fixedly connected to the edge 508 of a corresponding elastic element 505A and 505B. The other edge 509 of the elastic elements 505A and 505B is fixedly connected to the transducer frame portion 512 of the enveloping drive shaft 501. The elastic elements 505A and 505B extend between the frame protrusion 511 and the transducer frame portion 512 of the enveloping drive shaft. In other alternative embodiments, the frame protrusions 511 can be replaced by thickening the frame fastening arms 513 without affecting the implementation of the invention.

[0171] The elastic elements 505A and 505B are generally cuboids. The distance from the frame protrusion 511 to the transducer frame portion 512 enveloping the drive shaft is the length of the elastic element. The distance between the elastic elements 505A and 505B along the longitudinal axis of the drive shaft is the width of the elastic element. The length of the other side of the cuboid is the thickness of the elastic element. The plane formed by the length and width of each elastic element 505A and 505B is the elastic element plane. The elastic element plane is the plane connecting the frame protrusion 511 and the transducer frame portion 512 enveloping the drive shaft. Preferably, the angle between this plane and the longitudinal axis L2 of the drive shaft is less than 30 degrees. In this embodiment, the angles between the planes of the four elastic elements 505A and 505B and the longitudinal axis L1 of the cleaning element are δ1, δ2, δ3, and δ4, respectively. In this embodiment, δ1, δ2, δ3, and δ4 are all equal to 60 degrees. In other words, the angle between the planes of elastic elements 505A and 505B and the mid-plane P is 30 degrees. It should be understood that in other alternative embodiments, δ1, δ2, δ3, and δ4 can take different values.

[0172] In the fourth embodiment, both the proximal elastic element 505A and the distal elastic element 505B are made of metal. The elastic elements 505A and 505B can be as follows: Figure 16 As shown, two independent elastic bodies are formed along the longitudinal axis. Each of them includes two symmetrically arranged elastic elements. Each independent elastic body has a through hole in its middle portion and through holes at both ends. These through holes are used to fix the elastic body to the longitudinal axis of the transducer frame. In other alternative embodiments, four independent elastic elements can be combined to form an elastic element assembly. Of course, the transducer elastic elements can also be arranged in other ways, and these arrangements will also fall within the scope of this invention.

[0173] like Figure 14As shown, magnets 502 and 503 are symmetrically distributed on both sides of the longitudinal axis L2 of the drive shaft, enveloping the drive shaft 501 at the tail end of the transducer frame away from the cleaning element. The first drive coil and the second drive coil are located on opposite sides of the longitudinal axis L2 of the drive shaft, and there is no relative movement between the first drive coil, the second drive coil, and the handle housing. Magnets 502 and 503 have opposite magnetic poles facing the same drive coil; for example, magnet 502 has an S pole facing the second drive coil, and magnet 503 has an N pole facing the second drive coil. The direction of the current I in the first and second drive coils is perpendicular to the direction of the magnetic field lines inside magnets 502 and 503.

[0174] The motion analysis of transducer 7' in the fourth embodiment is similar to that of transducer 7 in the first embodiment, and will not be repeated here.

[0175] In the fourth embodiment of the invention, the proximal and distal elastic elements 505A and 505B are made of metal. According to the principles of solid mechanics, under bending elastic deformation, the elastic element is equivalent to a linear spring. Taking a cuboid elastic element as an example, the equivalent linear spring constant K = 3 * E * I z / (a 3 ),

[0176] Where E is the elastic modulus of the material, and I z Let a be the moment of inertia of the elastic element corresponding to the driving force or driving torque, and let a be the distance from the point of application of the driving force on the elastic element to the other edge 508 of the elastic element, which is equivalent to the handle housing being stationary.

[0177] When the driving frequency f0 equals the mechanical natural frequency f n At this time, the mechanical parts are in forced resonant motion. When the drive coil carries an alternating current I with a frequency of f0, the transducer 7' and the cleaning component are subjected to an electromagnetic force with a frequency of f0. The frequency of the driving force f0 is between the natural frequency f of the transducer 7'. n Between 85% and 115%. According to the principle of simple harmonic motion, the frequency f0 of the driving force is usually between the mechanical natural frequency f0 and f0. n When the electrical energy of the resonant motion is between 85% and 115%, the mechanical part can be considered to be in forced resonant motion. The electrical energy of the resonant motion and the resonant motion are converted into mechanical energy with high efficiency.

[0178] Similar reference Figure 8 The pressure applied to cleaning element 3 is F1, the equivalent force on the proximal elastic element 505A is F2, and the equivalent force on the distal elastic element 505B is F3. The pressure F1 applied to cleaning element 3 is parallel to the longitudinal axis L1 of the cleaning element, i.e., perpendicular to the mid-plane P. (Reference) Figure 17In the fourth embodiment, the angle between the planes of elastic elements 505A and 505B and the longitudinal axis L1 of the cleaning element is angle δ, which is less than 80 degrees. In this embodiment, angle δ is 60 degrees. When pressure F1 is applied to the cleaning element 3, elastic elements 505A and 505B can generate a component force parallel to the longitudinal axis L1 of the cleaning element. Since one edge 509 of elastic elements 505A and 505B is fixed to the transducer frame portion 512 of the enveloping drive shaft, and the other edge 508 is fixed to the frame protrusion 511, according to the principles of torque balance and force balance, the direction of the equivalent force F2 on the proximal elastic element 505A is opposite to the direction of pressure F1, and the direction of the equivalent force F3 on the distal elastic element 505B is the same as the direction of pressure F1. The proximal elastic element 505A is in a stretched state to generate the equivalent force F2, and the distal elastic element 505B is in a stretched state to generate the equivalent force F3. The component of pressure F1 perpendicular to the plane of the elastic element causes pressure bending deformation of elastic elements 505A and 505B. This pressure bending deformation further increases the internal stress of the elastic elements, potentially causing yielding and resulting in a drastic change in the natural frequency of transducer 510, leading to transducer failure. To avoid transducer failure, in this invention, the angle δ is less than 80 degrees and greater than or equal to 0 degrees. More preferably, the angle δ is less than or equal to 60 degrees and greater than or equal to 0 degrees, thereby effectively reducing the component of pressure F1 perpendicular to the plane of the third elastic element and reducing the pressure bending deformation of the third elastic element caused by pressure F1.

[0179] Equally important, the distance between the equivalent force F2 on the proximal elastic element 505A and the equivalent force F3 on the distal elastic element 505B is crucial for torque balance. Through extensive experimentation and considering the feasibility of the manufacturing process, the distance between the centerline L5 of the proximal elastic element and the centerline L6 of the distal elastic element is at least 3.5 mm along the longitudinal axis L2 of the drive shaft. The centerline is the centerline of the second elastic element plane located on the elastic element plane, pointing from the frame fastening arm 513 towards the transducer frame portion 512 enveloping the drive shaft. For example... Figure 14 As shown, since the centerline L5 of at least one third proximal elastic element is more than 3.5 mm away from the centerline L6 of the third distal elastic element, compared to having only one proximal elastic element 505A, it can better avoid the torsional deformation caused by the pressure F1 on the cleaning element 3 on the elastic elements 505A and 505B, and avoid excessive stress on the elastic elements, thereby avoiding transducer failure.

[0180] As a variation of the fourth embodiment of the present invention, there may be only two elastic elements 505, including a proximal elastic element 505A and a distal elastic element 505B, for example, only one elastic element. Figure 15 There is only one proximal elastic element 505A located on the left side of the drive shaft. Figure 15The elastic element 505B located on the right side of the drive shaft can still meet the requirements of the present invention for the elastic element combination.

[0181] The distribution and location of the magnets are similar to those of... Figure 10 , Figure 11 , Figure 12 , Figure 13 The analysis will not be repeated here. All the above combinations fall within the scope of this invention.

[0182] Obviously, similar to the first embodiment, the proximal elastic element 505A and distal elastic element 505B of the metal in the fourth embodiment can also identify the pressure F1 of the cleaning element. The maximum pressure F1 of the cleaning element is the pressure F1 on the cleaning element. M The range is from 3N to 15N, and the starting pressure F4 of the cleaning element is greater than or equal to 0N and less than or equal to 2.5N.

[0183] The transducer according to the present invention incorporates an elastic element arranged offset along the drive shaft to balance the force and torque caused by the pressure F1 on the cleaning element. This reduces the additional bending deformation of the elastic element caused by the pressure F1 on the cleaning element, thereby enabling the transducer to operate in a resonant state for a longer lifespan. On the other hand, it ensures that the transducer and cleaning assembly are within the resonant range, allowing for a greater force to be applied to the cleaning element. Furthermore, the arrangement of the elastic element according to the present invention enables miniaturization of the cleaning device.

[0184] Energy transfer efficiency is extremely high in resonant or resonant states. In existing drive structures using bearings (e.g., ball bearings), constraint components like bearings are used to prevent the cleaning device from undergoing motion other than rotation. However, this constraint introduces noise and energy loss, and increases cost. According to the present invention, by rationally configuring the elastic element and permanent magnet, smooth rotation of the transducer can be achieved, thus eliminating the need for constraint components required for the rotation of the cleaning device. Because the permanent magnet is rationally configured so that the electromagnetic resultant force on the transducer is approximately zero, and the torque acting on the transducer is cleverly utilized, constraint structures can be eliminated, resulting in a more compact cleaning device structure, smoother rotation, and lower noise.

[0185] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A transducer for cleaning and care tools, comprising: A transducer (7, 7') includes a transducer frame (110, 510), a magnet attached to the transducer frame, a resilient component attached to the transducer frame, and a drive shaft (101, 501) having a proximal end and a distal end, and the drive shaft being fixed to the transducer frame, wherein the drive shaft defines a longitudinal axis (L2) and the longitudinal axis extends through a median plane (P), and the median plane is substantially perpendicular to the direction of application of the cleaning force (F1) on the cleaning and care appliance; as well as The drive coils (121, 122, 221, 321, 322, 323, 324) are arranged relative to the magnet of the transducer (7, 7'), and the transducer is movable relative to the drive coils. When an alternating current I with frequency f0 passes through the drive coils, the drive coils and the magnets interact to generate a reciprocating couple about the longitudinal axis (L2) of the drive shaft, which drives the transducer to resonate. Its features are, The elastic assembly includes at least one proximal elastic element (105A, 505A) and at least one distal elastic element (105B, 505B) offset along the longitudinal axis (L2), the proximal elastic element being closer to the proximal end of the drive shaft than the distal elastic element. The proximal elastic element (105A, 505A) and the distal elastic element (105B, 505B) each have a first edge (109, 509) and a second edge (108, 508). The first edge (109, 509) is fixed to the drive shaft to move with the drive shaft, and the second edge (108, 508) constitutes the fixed edge of the proximal and distal elastic elements during elastic deformation. The planes of the proximal elastic element (105A, 505A) and the distal elastic element (105B, 505B) extend radially outward from the longitudinal axis. The plane of the proximal elastic member forms a first angle relative to the mid-plane (P), and the plane of the distal elastic member forms a second angle relative to the mid-plane, wherein the first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees.

2. The transducer as described in claim 1, characterized in that, The distance between the center lines of the widths of the proximal elastic element and the distal elastic element along the longitudinal axis is at least 3.5 mm.

3. The transducer as described in claim 1 or 2, characterized in that, The proximal elastic element and the distal elastic element are located on opposite sides of the median plane or on the same side of the median plane, and the proximal elastic element and the distal elastic element are located on opposite sides of or on the same side of a vertical plane perpendicular to the median plane (P) and including the longitudinal axis. Alternatively, the proximal elastic element and the distal elastic element may be aligned along the direction of the vertical plane.

4. The transducer as described in claim 1 or 2, characterized in that, The proximal elastic element is made of plastic or metal, or more than 60% of the stiffness coefficient of the proximal elastic element is made of plastic or metal, and the distal elastic element is made of plastic, or more than 60% of the stiffness coefficient of the distal elastic element is made of plastic.

5. The transducer as described in claim 1 or 2, characterized in that, The proximal elastic elements are arranged in pairs symmetrically about the longitudinal axis, and the distal elastic elements are arranged in pairs symmetrically about the longitudinal axis.

6. The transducer as described in claim 1, characterized in that, The elastic component further includes at least one other elastic element (104A, 104B), which is made of metal and is offset relative to the proximal elastic element and the distal elastic element along the longitudinal axis. The angle between the plane of the at least one elastic element and the median plane is smaller than the angle between the planes of the proximal elastic element and the distal elastic element and the median plane. The elastic modulus of the other elastic element is more than twenty times that of the elastic modulus of the distal elastic element.

7. The transducer as described in claim 1, characterized in that, The transducer frame includes a transducer frame portion (112) that encloses the drive shaft and a pair of frame fastening walls (113) that are radially spaced from the drive shaft. The frame fastening wall (113) has an upper protrusion and a lower protrusion, which are offsetly arranged on the frame fastening wall. The first edge is fixed to the transducer frame portion, while the second edge is fixed to the upper and lower protrusions of the frame fastening wall, respectively.

8. The transducer as described in claim 1, characterized in that, The drive coil is arranged so that it has no relative movement with respect to the housing of the cleaning and care appliance, and the drive coil is arranged in the magnetic field generated by the magnets, with an angle of approximately 90 degrees between the magnetic lines of force generated by the magnets (102, 103, 202, 203, 302) and the direction of the current I in the drive coils (121, 122).

9. A pressure alarm mechanism for cleaning and care appliances, comprising: The drive unit includes a magnet and a frame; A drive shaft (101) defines a longitudinal axis and has a proximal end and a distal end, and a drive portion is attached to the drive shaft from the distal end of the drive shaft. The proximal elastic element (105A, 505A) has a first edge (109) fixed to the drive shaft to move with the drive shaft. The proximal elastic element has a second edge opposite to the first edge, which constitutes a fixed edge when the proximal elastic element is elastically deformed. The distal elastic element (105B, 505B) is offset from the proximal elastic element along the longitudinal axis toward the distal end. The first edge (109) of the distal elastic element is fixed to the drive shaft to move with the drive shaft. The distal elastic element has a second edge opposite to the first edge, which constitutes a fixed edge when the distal elastic element is elastically deformed. When a cleaning force (F1) is applied along a first direction, the position where the second edge of the proximal elastic element connects to the drive shaft constitutes the fulcrum of the drive shaft. The proximal end of the drive shaft generates a first displacement along the first direction, and the drive shaft at the position of the first edge of the distal elastic element generates a second displacement along a second direction opposite to the first direction. The longitudinal axis extends through the midline plane, which is substantially perpendicular to the cleaning force. The plane of the proximal elastic member forms a first angle with respect to the midline plane (P), and the plane of the distal elastic member forms a second angle with respect to the midline plane. The first angle and the second angle are greater than or equal to 10 degrees and less than or equal to 90 degrees. The sensing device includes a fixed component and a movable component, the movable component being disposed on the drive unit. When the cleaning force (F1) is applied to the proximal end, the movable component generates a third displacement relative to the fixed component in a second direction. When the cleaning force (F1) exceeds the maximum pressure (F1... M When the movable part is displaced relative to the fixed part, the alarm device of the pressure alarm mechanism generates an alarm indication. The fixed part of the sensing device includes a sensing device and a transmitting source, wherein the sensing device and the transmitting source include at least one of electrical, magnetic and optical sensing devices and transmitting sources.

10. The pressure alarm mechanism as described in claim 9, characterized in that, The distance between the center lines of the widths of the proximal elastic element and the distal elastic element along the longitudinal axis is at least 3.5 mm.

11. The pressure alarm mechanism as described in claim 9 or 10, characterized in that, The proximal elastic element and the distal elastic element are located on opposite sides of the median plane or on the same side of the median plane, and the proximal elastic element and the distal elastic element are located on opposite sides or the same side of a vertical plane perpendicular to the median plane (P) and containing the longitudinal axis, or the proximal elastic element and the distal elastic element are along the direction of the vertical plane.

12. The pressure alarm mechanism as described in claim 9, characterized in that, The magnet is attached to the distal end of the drive shaft via the frame. The movable component is further away from the proximal elastic element than the proximal end of the drive shaft.

13. The pressure alarm mechanism as described in claim 9, characterized in that, A gap is formed between the fixed sensing device and the emission source, and the movable component includes a blocking block that can move into the gap between the sensing device and the emission source.

14. The pressure alarm mechanism as described in claim 13, characterized in that, The sensing device and the emission source are disposed on the housing of the cleaning and care appliance or on a part fixed relative to the housing.

15. The pressure alarm mechanism as described in claim 9, characterized in that, The pressure alarm mechanism includes a pressure limiting part that restricts the range of movement of the movable part, so that the maximum pressure (F1) is limited. M Within the range of 2.5N to 15N, The pressure limiting part is provided on the outer shell of the cleaning and care tool or on a part fixed relative to the outer shell.

16. The pressure alarm mechanism as described in claim 15, characterized in that, The pressure alarm mechanism further includes a drive coil, which is arranged so as to have no relative movement with respect to the housing of the cleaning and care appliance. The drive coil is positioned within the magnetic field generated by the magnets in the drive unit. The angle between the magnetic lines of force generated by the magnets (102, 103, 202, 203, 302) and the direction of the current I in the drive coils (121, 122) is approximately 90 degrees. The drive coil carries an alternating current I with a frequency of f0, thereby the interaction between the drive coil and the magnet generates a reciprocating couple with the longitudinal axis (L2) of the drive shaft as the axis. The reciprocating couple drives the transducer, which includes the drive shaft, the proximal elastic element and the distal elastic element, to resonate.

17. A cleaning and care appliance, the cleaning and care appliance comprising a transducer as claimed in any one of claims 1 to 8 or a pressure alarm mechanism as claimed in any one of claims 9 to 16, the cleaning and care appliance comprising one of an electric toothbrush, an electric shaver, an electric facial cleanser, and an electric shower.

18. The cleaning and care appliance as claimed in claim 17, characterized in that, The transducer (7) and the cleaning component of the cleaning and care tool form a resonator. The drive coil and the magnet interact to generate a reciprocating couple with the longitudinal axis (L2) of the drive shaft as the axis. The reciprocating couple drives the resonator to resonate. The natural frequency f of the resonator is... n It is between 85% and 115% of the frequency f0 of the reciprocating couple.

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