Cleaning and nursing equipment and its energy exchange device and pressure alarm mechanism

Abstract

The present invention provides a cleaning and nursing tool and its energy exchange device and pressure alarm mechanism. The energy exchange device according to the present invention includes a transducer, and an elastic assembly includes at least one proximal elastic member and at least one distal elastic member, the proximal elastic member and the distal elastic member each having a first edge and a second edge, the first edge is fixedly coupled to a drive shaft and moves with the drive shaft, the second edge constitutes a fixed edge when the proximal elastic member and the distal elastic member are elastically deformed, the plane of the proximal elastic member forms a first angle with the rack median plane, and the plane of the distal elastic member forms a second angle with the median plane. The adoption of the energy exchange device according to the present invention can protect the elastic member from failure and reduce the volume of the energy exchange device, which is advantageous for realizing a pressure alarm mechanism by the elastic assembly.

Description

[Technical Field]

[0001] The present invention relates to the technical field of cleaning and nursing equipment, and more particularly to an energy exchange device and a pressure alarm mechanism in cleaning and nursing equipment. [Background technology]

[0002] For personal cleaning and care tools such as electric toothbrushes, electric shavers, electric facial cleansers, and electric bathing devices, it is important to have an energy exchange device that can convert the reciprocating motion into the expected rotational motion of the cleaning element, and these personal cleaning and care tools should have a simple structure, be easy to assemble, have a long service life, be safe and reliable, and be small in volume.

[0003] Many drive mechanisms for driving cleaning elements are known, for example, motors, magnetic systems, electromagnetic systems, etc. Some drive structures support the driver using bearings, such as ball bearings, which are expensive and complex structures and also present noise and motor damping.

[0004] Another Chinese invention patent with the grant publication number CN104617732B of the present applicant discloses a personal cleaning and nursing tool, the transducer of which comprises a drive shaft, a transducer elastic member fixing device fastened to left and right brackets of the drive shaft, at least two permanent magnets, corresponding permanent magnet brackets for fixedly connecting the permanent magnets, left and right transducer transmission arms fixedly connected to the permanent magnet brackets and fixedly connected to the drive shaft, and at least two left and right transducer elastic members installed on both the left and right sides of the longitudinal axis of the drive shaft, The permanent magnets on the right side are independent of each other, and the permanent magnets on one side have a magnetic pole with a south or north polarity facing the drive coil, while the permanent magnets on the other side have a magnetic pole with a polarity facing the drive coil that is opposite to that of the permanent magnets on the one side. The left and right permanent magnets are installed so that the angle between their internal magnetic field lines and the longitudinal axis of the drive coil is greater than 45° and less than 135°, respectively. The left and right permanent magnets are movable relative to the elastic member fixing member, and when an alternating current I with a frequency f0 is passed through the drive coil, the direction of movement of the left and right permanent magnets and the longitudinal axis of the drive coil core are approximately parallel. Summary of the Invention [Problem to be solved by the invention]

[0005] Although the above embodiment does not require a ball bearing to be attached to the drive shaft, the elastic members have limited ability to balance the pressure of the cleaning elements, and therefore, after prolonged use, the elastic members are prone to fatigue and yield, thereby affecting the lifespan of the transducer. Also, because the elastic members are fixedly coupled to the corresponding transducer transmission arms and fixedly coupled to the transducer fixing members, the overall volume of the transducer is large, which is disadvantageous for miniaturizing the cleaning tool. Therefore, an improvement is needed over existing personal cleaning and care tools. [Means for solving the problem]

[0006] To overcome the deficiencies in the prior art, the present invention provides a personal cleaning care tool, the personal cleaning care tool comprising a transducer and a drive coil, the transducer comprising a transducer rack, a magnet attached to the transducer rack, a resilient assembly attached to the transducer rack, and a drive shaft, the drive shaft having a proximal end and a distal end, the drive shaft being fixedly coupled to the transducer rack, the drive shaft defining a longitudinal axis, the longitudinal axis extending through a mid-plane substantially perpendicular to a cleaning force in the cleaning care tool, and a drive coil positioned relative to the magnet of the transducer; The transducer is movable relative to the drive coil, and the elastic assembly includes at least one proximal end elastic member and at least one distal end elastic member offset along the longitudinal axis, the proximal end elastic member being closer to the proximal end of the drive shaft than the distal end elastic member, the proximal end elastic member and the distal end elastic member each having a first edge and a second edge, the first edge being fixedly connected to the drive shaft and moving along with the drive shaft, and the second edge forming a fixed edge when the proximal end elastic member and the distal end elastic member are elastically deformed, and the respective planes of the proximal end elastic member and the distal end elastic member extending substantially radially outward from the longitudinal axis.

[0007] According to a preferred embodiment of the present invention, the distance between the centerlines of the proximal and distal elastic members along the width of their respective longitudinal axes is at least 3.5 mm.

[0008] According to a preferred embodiment of the present invention, the plane of the proximal end elastic member forms a first angle with respect to the median plane, and the plane of the distal end elastic member forms a second angle with respect to the median plane, the first angle and the second angle being greater than or equal to 10 degrees and less than or equal to 90 degrees.

[0009] According to a preferred embodiment of the present invention, the proximal end elastic member and the distal end elastic member are located on opposite sides of the medial plane or on the same side of the medial plane, and the proximal end elastic member and the distal end elastic member are located on opposite sides or on the same side of a vertical plane that is perpendicular to the medial plane P and includes the longitudinal axis. Alternatively, the proximal end elastic member and the distal end elastic member are arranged along the direction of the vertical plane.

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

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

[0012] According to another preferred aspect of the present invention, the elastic assembly further comprises at least another elastic member, the at least another elastic member being constructed of metal, the elastic member being offset relative to the proximal end elastic member and the distal end elastic member along the longitudinal axis, the angle between the plane of the metal elastic member and the medial plane being less than the angle between the plane of the proximal end elastic member and the distal end elastic member and the medial plane, and the overall elastic modulus of the metal elastic member being at least 20 times the overall elastic modulus of the distal end elastic member.

[0013] According to another preferred embodiment of the present invention, the transducer rack comprises a transducer rack portion that encircles the drive shaft and a pair of rack fastening walls that are radially spaced from the drive shaft, the rack fastening walls having upper and lower convex portions that are offset from each other on the rack fastening walls, a first edge portion that is fixed to the transducer rack portion, and a second edge portion that is fixed to the upper and lower convex portions of the rack fastening walls, respectively.

[0014] The present invention also provides a pressure warning mechanism for use in a cleaning and nursing tool, the pressure warning mechanism comprising: a drive shaft defining a longitudinal axis and having a proximal end and a distal end, a drive unit attached to the drive shaft from the distal end of the drive shaft, the proximal end of the drive shaft undergoing a first displacement along the first direction when a detergency F1 of the cleaning and nursing tool is along the first direction; a proximal-end elastic member having a first edge fixedly coupled to the drive shaft and moving with the drive shaft, the position of which constitutes a fulcrum of the drive shaft; a distal end elastic member offset along the axis toward the distal end, a first edge portion fixedly coupled to the drive shaft and moving along the drive shaft, and when a cleaning force F1 is applied to the proximal end, the drive shaft at the position of the first edge generates a second displacement along a second direction opposite to the first direction; and a sensor device having a fixed member and a movable member, the movable member being provided in the drive unit, and when a cleaning force F1 is applied to the proximal end, the movable member generates a third displacement along the second direction relative to the fixed member, and when the cleaning force F1 reaches a maximum pressure F1 M and a movable member that, when its displacement relative to the fixed member exceeds a predetermined value, generates an alarm indication in an alarm device of the pressure alarm mechanism.

[0015] According to another preferred embodiment of the present invention, the proximal end elastic member and the distal end elastic member each have a second edge portion opposite to the first edge portion, the second edge portion constituting a fixed edge portion when the proximal end elastic member and the distal end elastic member are elastically deformed, the distance between the center lines along the width of the longitudinal axis of each of the proximal end elastic member and the distal end elastic member is at least 3.5 mm, the plane of the proximal end elastic member forms a first angle with the median plane (P), and the plane of the distal end elastic member forms a second angle with the median plane, the first angle and the second angle being between 10 degrees and 90 degrees.

[0016] According to another preferred embodiment of the present invention, the longitudinal axis extends through a median plane, the median plane being substantially perpendicular to the cleaning force, the plane of the proximal end elastic member forms a first angle with the median plane P, and the plane of the distal end elastic member forms a second angle with the median plane, the first and second angles being greater than or equal to 10 degrees and less than or equal to 90 degrees, the proximal end elastic member and the distal end elastic member being located on opposite sides of the median plane or on the same side of the median plane, and the proximal end elastic member and the distal end elastic member being located on opposite sides of the plane in which the longitudinal axis lies and the direction of the cleaning force or being located along the direction of the cleaning force.

[0017] According to another preferred aspect of the present invention, the drive unit includes a magnet and a rack, the magnet is attached to the distal end of the drive shaft via the rack, and the movable member is farther from the proximal end elastic member than the proximal end of the drive shaft.

[0018] According to another preferred aspect of the present invention, the fixed member of the sensor device comprises an inductive element and an emission source, a gap is formed between the inductive element and the emission source, the movable member comprises a barrier block that is movably inserted into the gap between the inductive element and the emission source, and the inductive element and the emission source comprise at least one of an electric, magnetic, or optical inductive element and emission source.

[0019] According to another preferred aspect of the present invention, the inductive element and the emission source are disposed on a circuit board, a housing, or a component fixed to the housing of the cleaning and nursing tool, wherein the component fixed to the housing includes a circuit board, a battery box rack, or the like.

[0020] According to another preferred embodiment of the present invention, the pressure warning mechanism is configured to detect the maximum pressure F1 of the induction element. M The cleaning and nursing tool is provided with a pressure limiting portion that limits the range of movement of the movable member so that the maximum pressure is within the range of 2.5N to 15N, and the maximum pressure limiting portion is installed on the housing of the cleaning and nursing tool or on a part fixed to the housing.

[0021] The present invention also provides a cleaning and nursing tool having the energy exchange device or the pressure warning mechanism, and the cleaning and nursing tool comprises one of an electric toothbrush, an electric shaver, an electric facial cleanser, and an electric bathing device.

[0022] Furthermore, according to the present invention, the drive coil is positioned so as not to move relative to the housing of the cleaning and nursing tool, the drive coil is placed in the magnetic field generated by the magnet, the angle between the magnetic field lines generated by the magnet and the direction of the current I in the drive coil is approximately 90 degrees, and an alternating current I of frequency f0 flows through the drive coil, so that the drive coil and the magnet interact to generate a reciprocating force pair with the longitudinal axis of the drive shaft as its axis, and the reciprocating force pair drives the transducer to resonate.

[0023] In addition, in the cleaning and nursing tool of the present invention, the transducer and the cleaning assembly of the cleaning and nursing tool constitute a resonator, and the driving coil and the magnet interact to generate a reciprocating force pair with the longitudinal axis L2 of the driving shaft as an axis line, and the reciprocating force pair drives the resonator to resonate, and the resonator has a natural frequency f n is between 85% and 115% of the frequency f0 of the reciprocating force pair. [Effects of the Invention]

[0024] The energy exchange device of the present invention solves the problem of elastic members easily fatigued and yielding, extends the service life of the energy exchange device, and realizes a compact personal cleaning and care tool, while being easy to assemble, rotating smoothly, quiet, with low damping, safe and reliable. Furthermore, the pressure alarm mechanism can identify the magnitude of pressure applied to the cleaning element. [Brief explanation of the drawings]

[0025] For a more complete understanding of the present invention, the following description of illustrative embodiments may be considered in conjunction with the accompanying drawings, in which:

[0026] [Figure 1]FIG. 1 is a perspective view of a personal cleaning and care implement and its internal mechanism according to a first preferred embodiment of the present invention. [Figure 2] FIG. 2 is an exploded view of the internal mechanism including the energy exchange device of the cleaning and nursing tool shown in FIG. [Figure 3] FIG. 3 is a perspective view of an energy exchange device according to a first preferred embodiment of the present invention. [Figure 4] FIG. 4 is a perspective view of an energy exchange device according to a first preferred embodiment of the present invention, showing an elastic assembly in the energy exchange device. [Figure 5] FIG. 5 shows two types of first elastic members and drive shafts applicable to the first embodiment of the present invention. [Figure 6] FIG. 6 shows two types of first elastic members of a transducer applicable to the first embodiment of the present invention. [Figure 7] FIG. 7 is a schematic end view showing the positional relationship between the cleaning element, the first elastic member, and the second elastic member. [Figure 8] FIG. 8 is a schematic diagram illustrating the forces of a resilient member and cleaning assembly along a longitudinal axis according to a preferred embodiment of the present invention. [Figure 9] FIG. 9 is a bottom perspective view of the energy exchange device and circuit board according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of an energy conversion device according to a second preferred embodiment of the present invention. [Figure 11] FIG. 11 is another perspective view of the energy exchange device of FIG. 10, showing the drive coil. [Figure 12] FIG. 12 is a perspective view of an energy conversion device according to a third embodiment of the present invention. [Figure 13] 13 is another perspective view of the energy exchanger shown in FIG. 12 with the drive coil removed. [Figure 14] FIG. 14 is a perspective view of an energy conversion device according to a fourth embodiment of the present invention. [Figure 15]FIG. 15 is a schematic diagram of a combination of a drive shaft, an elastic member, and a magnet in the energy exchange device according to the fourth embodiment of the present invention shown in FIG. [Figure 16] FIG. 16 is a schematic view of an elastic member in the energy exchange device according to the fourth preferred embodiment of the present invention shown in FIG. [Figure 17] FIG. 17 is a diagram showing the relationship between the holder, the elastic member and the cleaning element of the energy exchange device according to the fourth preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention will be described in detail below with reference to specific embodiments and drawings. In the following description, various details are described to facilitate a thorough understanding of the present invention. However, it is clear that the present invention can be embodied in other forms different from those described above. Those skilled in the art can extend or infer the present invention according to actual application situations without departing from the spirit of the present invention. Therefore, it goes without saying that the scope of protection of the present invention is not limited to the specific embodiments described above.

[0028] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings, taking an electric toothbrush as a typical example of a personal cleaning and care tool. Although the present invention will be described using an electric toothbrush as an example, the present invention is not limited thereto. The present invention may also be applied to cleaning and care tools that provide cleaning action through a transducer, such as an electric shaver, an electric facial cleanser, or an electric bathing device.

[0029] For clarity, this specification uses terms expressing spatial relative positions, such as "top," "bottom," "left," "right," "proximal end," and "distal end," to briefly describe the interrelationship of one element or feature shown in the figures with other element(s) or feature(s). In these terms, the longitudinal axis direction of the drive coil refers to the direction parallel to the magnetic field lines generated within the iron core when current I flows through the drive coil. "Top" and "bottom" refer to the longitudinal axis of the drive shaft, and are defined as an upward direction parallel to the longitudinal axis of the drive shaft and a downward direction parallel to the longitudinal axis of the drive shaft, respectively. "Left" and "right" refer to the longitudinal axis of the drive shaft, and are defined as the left side of the longitudinal axis of the drive shaft and the right side of the longitudinal axis of the drive shaft, respectively, along a direction perpendicular to the longitudinal axis of the drive shaft. "Proximal end" refers to the end or side closest to the position where the cleaning force acts during use of the cleaning and nursing tool. "Distal end / distal side" means the end or side away from the location where cleaning forces act when the cleaning and care implement is in use.

[0030] Furthermore, as used herein, the term "and / or" includes any and all combinations of one or more of the associated listed terms.

[0031] In this specification, although a term such as "first" is used to describe a plurality of elements or components, these elements or components should not be limited by these terms. These terms are used merely to distinguish one element or component from other elements or components, and do not imply "order." Therefore, even if the ordinal terms of the elements or components described below are interchanged, the concept and scope of the present invention will not be exceeded.

[0032] 1 and 2 are a perspective view and an exploded perspective view, respectively, of a cleaning care tool according to a first preferred embodiment of the present invention. Hereinafter, the cleaning care tool will be described using an electric toothbrush as an example. The electric toothbrush mainly comprises a handle 1 and a cleaning assembly detachably attached to the handle 1. The handle 1 comprises a handle housing and various functional components attached to the handle housing. The cleaning assembly of the electric toothbrush takes the form of a toothbrush head having a cleaning element carrier 2 and cleaning elements 3 distributed on the cleaning element carrier 2. The toothbrush head carrier 2 is attached to the handle 1, for example, by snap-connection, which allows the drive handle 1 and the cleaning assembly to be securely connected and easily separated from each other. The cleaning elements 3 may be brush bristles or the like.

[0033] The functional components of the handle 1 of the cleaning and nursing tool mainly include a power supply unit, a control unit, a trigger unit, and an energy exchange device. The power supply unit typically includes a rechargeable battery 5 and a charging circuit installed in a battery box 135 to supply power to each component of the tool. The control unit mainly includes a circuit board 4 to control the various operating modes of the electric toothbrush and to open and close the electric toothbrush. The trigger unit includes a switch for starting and stopping the operation of the electric toothbrush. The energy exchange device is configured to convert input electrical energy into mechanical energy that provides reciprocating motion for the cleaning assembly.

[0034] 2, 3 and 4 show an energy exchange device according to a first embodiment of the present invention. The energy exchange device mainly comprises a transducer 7, and a drive coil of the energy exchange device is arranged relative to the transducer 7. The transducer 7 mainly comprises a transducer rack 110, a first magnet 102, a second magnet 103, a drive shaft 101 to which a cleaning assembly is detachably attached, and an elastic assembly for generating a resonant motion.

[0035] Preferably, the material of the transducer rack 110 is plastic, and in a first embodiment, the first magnet 102 and the second magnet 103, which are part of the transducer 7, are fixedly connected to the distal end of the transducer rack 110 away from the cleaning element 3 by means such as adhesive, screws or injection molding so that the magnets 102, 103 become an integral part of the transducer 7.

[0036] Preferably, the energy exchange device further comprises a transducer upper case 131 and a transducer lower case 132, which are fastened together, for example by fastening screws 133, to press the rack fastening arms 113 of the transducer rack 110 between the two cases and lock the transducer rack 110 accordingly. The transducer upper case 131 and the transducer lower case 132 are further fastened to the housing of the tool. However, it should be understood that in other alternative embodiments, the transducer upper case and the transducer lower case may be an integral part of the handle housing.

[0037] In a first preferred embodiment, as shown in Fig. 4, the elastic assembly of the transducer 7 includes four first elastic members 104 and four second elastic members 105. More specifically, as shown in Fig. 4, along the drive shaft 101, the elastic assembly includes, in order from the proximal end to the distal end, two first elastic members 104A, two second elastic members (proximal end elastic members) 105A, two second elastic members (distal end elastic members) 105B, and two first elastic members 104B.

[0038] Each of the first elastic members 104A and 104B is a substantially rectangular parallelepiped. The distance from the rack fastening arm 113 of each of the first elastic members 104A and 104B to the transducer rack portion 112 is the elastic member length. The distance along the longitudinal axis L2 of the drive shaft of each of the first elastic members 104A and 104B is called the elastic member width. The length of the remaining side of the rectangular parallelepiped is the elastic member thickness. The plane formed by the length and width of each of the first elastic members 104A and 104B is the elastic member plane. Similarly, each of the second elastic members 105A and 105B is a substantially rectangular parallelepiped. The distance from the rack protrusion 111 of each of the rack fastening arms 113 of each of the second elastic members 105A and 105B to the transducer rack portion 112 is the elastic member length. The distance along the longitudinal axis L2 of the drive shaft of each of the second elastic members 105A and 105B is called the elastic member width. The length of the other side of the rectangular parallelepiped is the elastic member thickness. The plane defined by the length and width of the second elastic members 105A and 105B is the elastic member plane.

[0039] As shown in Fig. 7, the four first elastic members 104A, 104B are located in the same plane, which is the mid-plane P of the energy exchange device. For the energy exchange device according to the present invention, the mid-plane P is defined as a plane perpendicular to the direction of the cleaning force F1 and on which the longitudinal axis L2 of the drive shaft is located, and the cleaning force F1 and the longitudinal axis L2 of the drive shaft are perpendicular to each other. In the electric toothbrush, the direction of the cleaning force F1 is defined as a direction on which the longitudinal axis L1 of the cleaning element 3 is located, i.e., the mid-plane P is substantially perpendicular to the longitudinal axis L1 of the cleaning element 3. Because the first elastic members 104 are located in the mid-plane P, the angle between the plane of the first elastic members 104 and the longitudinal axis L2 of the drive shaft is 0 degrees. More specifically, in the first embodiment, the angles between the plane of the first elastic members 104A, 104B and the longitudinal axis L1 of the cleaning element are β1, β2, β3, and β4, respectively, and in this embodiment, 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 members, as shown in Figure 7. However, in other alternative embodiments, the angles β1, β2, β3, and β4 may have other different values.

[0040] Furthermore, the second elastic member 105 of the elastic assembly includes a pair of a proximal elastic member 105A and a distal elastic member 105B, the two pairs of elastic members being offset along the longitudinal axis L2. The proximal elastic member 105A is closer to the proximal end of the drive shaft 101, while the distal elastic member 105B is closer to the distal end of the drive shaft 101. The plane of the second elastic member 105 is a plane connecting the rack protrusion 111 and the transducer rack portion 112 enveloping the drive shaft. Preferably, the angle between this plane and the median plane on which the longitudinal axis L2 is located is greater than 30 degrees, and more preferably, the angle between this plane and the longitudinal axis L2 is less than 30 degrees.

[0041] Unlike the arrangement in which the first elastic members 104A and 104B are positioned on the mid-plane P, the four second elastic members 105 are all positioned at an angle to the mid-plane P. In other words, the four second elastic members 105 are positioned at an angle to the plane on which the longitudinal axes L1 and L2 of the cleaning elements 3 are positioned. The proximal end elastic member 105A and the distal end elastic member 105B are respectively positioned at an angle on opposite sides of the mid-plane P. As shown in FIG. 7 , the proximal end elastic member 105A is positioned on the upper side of the mid-plane P and is positioned at an angle to the mid-plane P, and the distal end elastic member 105B is positioned below the mid-plane P and is positioned at an angle to the mid-plane P.

[0042] As shown in FIG. 7 , the four second elastic members 105A and 105B form angles α1, α2, α3, and α4 with respect to the longitudinal axis L1, respectively. To avoid transducer failure due to yielding of the elastic members, the angles α1, α2, α3, and α4 are between 0 and 80 degrees, more preferably between 0 and 60 degrees. In the first embodiment shown in FIG. 7 , the angles α1, α2, α3, and α4 are all equal to 60 degrees. In other words, the angle between the plane of the four second elastic members 105A and 105B and the median plane P is between 10 and 90 degrees, more preferably between 30 and 90 degrees. In the embodiment shown in FIG. 7 , the angles between the plane of the second elastic members 105A and 105B and the median plane P are all 30 degrees. It should be understood that in other alternative embodiments, angles α1, α2, α3, α4 may take on different values.

[0043] In the first embodiment, the first elastic member 104 and the second elastic member 105 are both fixed by a transducer rack 110. Specifically, as shown in Fig. 4, the transducer rack 110 includes a transducer rack portion 112 that encircles the drive shaft, and two rack fastening arms 113 that are disposed radially spaced apart from the transducer rack portion 112. Here, the rack fastening arms 113 are provided in pairs on opposite sides of the longitudinal axis L2.

[0044] The edge portions 106 of the pair of first elastic members 104 are fixedly connected to the two rack fastening arms 113, respectively, and the other edge portion 107 of the first elastic members 104 is fixedly connected to the transducer rack portion 112 that surrounds the drive shaft and substantially corresponds to the position of the longitudinal axis L2, and the first elastic members 104A, 104B extend between the rack fastening arms 113 and the transducer rack portion 112 adjacent to the longitudinal axis L2.

[0045] Similarly, the edge 109 of the second elastic member 105A and the second elastic member 105B is fixedly coupled to a transducer rack portion 112 that encircles the drive shaft, and the opposite edge 108 is fixedly coupled to a rack fastening arm 113. To achieve the angular arrangement of the second elastic members 105A and 105B with respect to the mid-plane P, rack protrusions 111 protrude from opposite sides of the rack fastening arm 113. Because the rack protrusions 111 are part of the rack fastening arm 113, the rack protrusions 111 can also be understood to be part of the transducer rack 110. The edge 108 of the second elastic member 105A is fixed to the corresponding rack protrusion 111.

[0046] In other alternative embodiments, the rack protrusion 111 may not be provided, for example, the rack fastening arm 113 may be thickened instead of the rack protrusion 111 .

[0047] The two first elastic members 104A and two first elastic members 104B, which are offset from each other along the longitudinal axis L2 of the drive shaft, are both made of metal. As shown in FIGS. 5 and 6, the two first elastic members 104A and 104B, which are offset from each other along the longitudinal axis L2 of the drive shaft, may form a single first elastic member assembly, which may be stamped from a single metal sheet or formed from two elastic member assemblies, each including one elastic member 204A and one elastic member 204B. In other alternative embodiments, four independent elastic members may be combined to form the first elastic member assembly. The various first elastic member assemblies described above can be considered to be composed of two independent first elastic members 104A, which are offset from each other along the longitudinal axis L2 of the drive shaft, and two independent first distal elastic members 104B, which are also offset from each other along the longitudinal axis L2 of the drive shaft.

[0048] More specifically, the proximal end elastic member can be considered to include two independent second elastic members 105A, and the distal end elastic member can be considered to include two independent second elastic members 105B. As shown in Fig. 4, the transducer rack 110 is distributed with four rack protrusions 111 that respectively fixedly couple other edge portions 108 of the corresponding second elastic members 105A, 105B, and other edge portions 109 of the second elastic members 105A, 105B are fixedly coupled to a transducer rack portion 112 that encircles the drive shaft, so that the second elastic members 105A, 105B extend between the rack protrusions 111 and the transducer rack portion 112 that encircles the drive shaft.

[0049] 2, 3, and 4, first magnet 102 and second magnet 103 of transducer 7 are symmetrically distributed above and below longitudinal axis L2 of the drive shaft (not coinciding with the left and right below, i.e., the magnets are arranged vertically and the drive coils are arranged horizontally), i.e., located above and below mid-plane P. First drive coil 121 and second drive coil 122 are located on both the left and right sides of longitudinal axis L2 of the drive shaft, respectively, and are fixed relative to the handle housing so as not to 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, and the first magnet 102 and the second magnet 103 facing the same drive coil 121 or 122 have opposite magnetic poles, so that the first magnet 102 facing the second drive coil 122 has a south pole, and the second magnet 103 facing the second drive coil 122 has a north pole, as shown in Figure 4. The direction of 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.

[0050] Hereinafter, a motion analysis will be performed using the energy exchange device according to the first embodiment of the present invention.

[0051] 1 to 4, a user activates the electric toothbrush by pressing the switch button. The circuit board 4 in the handle 1 activates the drive coils 121 and 122. An AC 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. When the direction of the current I in the first drive coil 121 is clockwise, 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. The first drive coil 121 and the second drive coil 122 do not move relative to 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 energized second drive coil 122, generating an electromagnetic force. The electromagnetic forces acting on the first magnet 102 and the second magnet 103 are equal in magnitude but opposite in direction, resulting in a balanced electromagnetic force acting on the transducer 7. However, because the first magnet 102 and the second magnet 103 are located above and below the longitudinal axis L2 of the drive shaft, respectively, 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 current, the direction of the electromagnetic torque M1 acting on the transducer 7 also alternates accordingly, resulting in the transducer 7 receiving a pair of reciprocating forces from the drive coils 121 and 122. Thus, there are electromagnetic forces acting on both sides of the longitudinal axis L2 of the drive shaft, and the elastic members 104 and 105 are the main components that receive the electromagnetic forces. Assume that, in the initial state, the direction of the electromagnetic torque M1 acting on the transducer is counterclockwise. The electromagnetic torque M1 of the transducer causes bending elastic deformation in the elastic members 104A, 104B and the second elastic members 105A, 105B, where the edges of the first elastic members 104A, 104B fixedly connected to the rack fastening arm 113 are fixed or stationary ends. The angle between the planes of the elastic members of the first elastic members 104A and 104B and the medial plane P is less than 30 degrees so that the first elastic member 104 undergoes reciprocating bending elastic deformation due to the electromagnetic moment M1, causing the transducer 7 and the cleaning assembly to resonate.The second elastic members 105A and 105B are similarly elastically deformed by reciprocating bending due to the electromagnetic moment M1, causing the transducer 7 and the cleaning assembly to resonate. In this manner, the edge 109 of the second elastic members 105A and 105B fixedly coupled to the drive shaft 101 serves as the movable end or resonating end of the elastic deformation, and the edge 108 of the second elastic members 105A and 105B fixedly coupled to the rack protrusion 111 serves as the fixed end or stationary end of the elastic deformation.

[0052] In the first embodiment, the elastic members 104A and 104B are made of metal or primarily metal, the second elastic member 105A may be made of plastic or metal, and the second elastic member 105B is made of plastic or primarily plastic. For ease of explanation, the present invention generally refers to the elastic members as being metal or plastic, but it should be understood that the elastic members may be composites of metal and plastic. If 60% or more of the stiffness coefficient of the elastic member is metal, the elastic member is said to be primarily made of metal. If 60% or more of the stiffness coefficient of the elastic member is plastic, the elastic member is said to be primarily made of plastic. If the stiffness coefficients contributed by the metal and the plastic are not both greater than 60% of the stiffness coefficient of the elastic member, the elastic member is said to be a composite of metal and plastic.

[0053] The material of the second elastic members 105 is plastic or is mainly made of plastic, and as shown in FIG. 4, the width of the second elastic members 105A and 105B is set larger than the width of the first elastic members 104A and 104B.

[0054] Below, an example will be analyzed in which the elastic members 105A and 105B are both made of plastic.

[0055] According to the principles of solid mechanics, in the state of bending elastic deformation, the elastic member is equivalent to a linear spring. Taking a rectangular parallelepiped elastic member as an example, the stiffness coefficient of the linear spring equivalent to the elastic member is expressed by the following formula:

[0056]

number

[0057] where E is the modulus of elasticity of the material and I z is the moment of inertia of the elastic member corresponding to the driving force or driving moment, and a is the distance from the point of application of the driving force on the elastic member to edge 106 of elastic member 104 or edge 108 of elastic member 105 where the elastic member is stationary relative to the handle housing. The a of first elastic members 104A and 104B is the first elastic member a1, and the a of second elastic members 105A and 105B is the second elastic member a2. The spring stiffness coefficient corresponding to first elastic members 104A and 104B is the first elastic member stiffness coefficient K1, and the spring stiffness coefficient corresponding to second elastic members 105A and 105B is the second elastic member stiffness coefficient K2.

[0058] In the first embodiment, the elastic modulus E1 of the material of the first elastic members 104A and 104B is preferably greater than 20 times the elastic modulus E2 of the material of the second elastic members 105A and 105B. For example, the material of the first elastic members 104A and 104B is stainless steel, and the elastic modulus E1 is 196 GPa, and the material of the second elastic members 105A and 105B is POM, and the elastic modulus E2 is 2.5 GPa. The moment of inertia of the first elastic members 104A and 104B with respect to the electromagnetic torque M1 is the moment of inertia I of the first elastic members. z1 The moment of inertia of the second elastic members 105A and 105B with respect to the electromagnetic torque M1 is the moment of inertia I z2 According to solid mechanics, the moment of inertia of a rectangular solid is expressed by the following formula:

[0059]

number

[0060] Here, b is the width of the corresponding elastic member, and h is the thickness of the corresponding elastic member. In the first embodiment, preferably, the moment of inertia I of the first elastic members 104A and 104B is z1The b of the second elastic members 105A and 105B is 1.3 mm, and the moment of inertia I z2 The b of the first elastic members 104A and 104B is 3.5 mm, and the moment of inertia I z1 The h of the second elastic members 105A and 105B is 0.16 mm, and the moment of inertia I z2 The angle h of the second elastic member 105B is 0.3 mm. Referring to the second elastic member 105B in the upper left corner of FIG. 7 and the first elastic member 104B on the left side of FIG. 7, the angle a2*cos(β1-α1) of the second elastic member is equal to or greater than the angle a1 of the first elastic member. In the first embodiment, β1 is 90 degrees and α1 is 60 degrees. Obviously, the angle between the plane of the first elastic member and the longitudinal axis L1 of the cleaning element is the angle β. The angle between the plane of the second elastic member and the longitudinal axis of the cleaning element is angle α, and an edge 107 of the first elastic member is fixedly coupled to the transducer rack portion 112 enveloping the drive shaft, another edge 106 of the first elastic member is fixedly coupled to the rack fastening arm 113, an edge 109 of the second elastic member is fixedly coupled to the transducer rack portion 112 enveloping the drive shaft, and another end of the second elastic member is fixedly coupled to the rack protrusion 111, so as to ensure that the angle β1 is greater than the angle α1 and a2 of the second elastic member is greater than a1 of the first elastic member. By calculation, E1*I of the first elastic member z1 / (a1 3 ) is E2*I of the second elastic member z2 / (a2 3 ), that is, the stiffness coefficient K1 of the first elastic member is greater than 6.8 times the stiffness coefficient K2 of the second elastic member. In the first embodiment, the equivalent mass of the vibration body consisting of the transducer 7 and the cleaning assembly with respect to the longitudinal axis L2 of the drive shaft is M m and the natural frequency of this vibrating body is f n and

number

[0061] where K n is the sum of the stiffness coefficients of all the first elastic members plus the stiffness coefficients of all the second elastic members. The sum of the stiffness coefficients of the first elastic members is K 1tand the sum of the stiffness coefficients of the second elastic member is K 2t is.

[0062] The driving frequency f0 is the machine natural frequency f n When an alternating current I of frequency f0 flows through the driving coil, the transducer 7 and cleaning assembly are subjected to an electromagnetic force of frequency f0, and the frequency f0 of the driving force is equal to the natural frequency f of the transducer 7. n According to the principle of simple harmonic motion, the frequency of the driving force f0 is generally between 85% and 115% of the natural frequency of the machine f nWhen the modulus of elasticity is between 85% and 115%, the mechanical part is in forced resonant motion, and the efficiency of the resonant motion and the conversion of electrical energy into mechanical energy is high. During the resonant motion of the transducer 7 and the cleaning assembly, the elastic member consumes some energy due to the action of internal material forces, which corresponds to the energy consumed by the internal resistance of the material. This energy manifests as heat generation in the elastic member material. The smaller the elastic modulus and the higher the internal resistance of the material, the higher the material temperature. Therefore, the first elastic members 104A and 104B are primarily made of metal, and the first elastic member has a high elastic modulus. The second elastic members 105A and 105B are primarily made of plastic, and the second elastic members 105A and 105B have a small elastic modulus, so the heat dissipation effect of metal materials is significantly greater than that of plastic materials. During the resonant motion of the transducer 7 and cleaning assembly, the temperature rise of the first elastic members 104A, 104B is significantly lower than the temperature rise of the second elastic members 105A, 105B. As the temperature rises, the elastic modulus of the elastic member material decreases, resulting in a smaller stiffness coefficient of the elastic members. In an embodiment in which the second elastic members 105A, 105B are plastic, the effect of the temperature rise of the first elastic members 104A, 104B on the stiffness coefficient of the first elastic members is negligibly small, while the effect of the temperature rise of the second elastic members 105A, 105B on the stiffness coefficient of the second elastic members is significant. To ensure that the transducer 7 and cleaning assembly are always in a resonant motion state during operation, the above equations and fundamental analysis can be summarized as follows: Assuming that the angular coefficient of the second elastic members 105A, 105B decreases to zero due to the temperature rise, (K 1t +K 2t ) 2 / (K 1t ) 2 <1.15 / 0.85 and K 1t >6.13K 2tWhen the natural frequency of the transducer 7 and cleaning assembly is .gtoreq.104A, .gtoreq.104B, the transducer 7 and cleaning assembly are always in a state of resonant motion during operation. The spring stiffness coefficients of the transducer 7 and cleaning assembly at their natural frequencies depend primarily on the stiffness coefficients of the first resilient members 104A, 104B. In a first embodiment, the sum of the stiffness coefficients of all first resilient members is greater than 6.13 times the sum of the stiffness coefficients of all second resilient members to ensure that the transducer is always in a state of efficient resonance during operation.

[0063] In another alternative embodiment, the material of the proximal end elastic member 105A is metal or consists primarily of metal, the material of the distal end elastic member 105B is plastic or consists primarily of plastic, and the sum of the stiffness moduli of all first elastic members plus the stiffness moduli of all proximal end second elastic members is greater than 6.13 times the sum of the stiffness moduli of all second elastic members. In this case, the material of the first elastic members 104A, 104B is metal, the material of the second elastic member 105B is plastic, and the elastic moduli of the first elastic members 104A, 104B are greater than or equal to 20 times the elastic moduli of the second elastic member 105B. The angle between the plane of the first elastic member and the longitudinal axis of the cleaning element is angle β. The angle between the plane of the second elastic member and the longitudinal axis of the cleaning element is angle α, with angle β being greater than angle α.

[0064] FIG. 8 is a schematic diagram illustrating the forces of the resilient members and cleaning assembly along the longitudinal axis according to a preferred embodiment of the present invention. As shown in FIG. 8, for a pressure F1 applied to the cleaning element 3, the equivalent force F2 on the second resilient member 105A and the equivalent force F3 on the second resilient member 105B are shown. The pressure F1 applied to the cleaning element 3 is substantially parallel to the longitudinal axis L1 of the cleaning element. In the present invention, the planes of the second resilient members 105A and 105B form an angle α of less than 80 degrees, specifically 60 degrees, with respect to the longitudinal axis L1 of the cleaning element. When the pressure F1 is applied to the cleaning element 3, the second resilient members 105A and 105B can generate a component force parallel to the longitudinal axis L1 of the cleaning element. The edges 109 of the second elastic members 105A and 105B are fixedly connected to the transducer rack portion 112, and another edge 108 is fixedly connected to the rack protrusion 111, so that according to the principles of moment equilibrium and force equilibrium, the direction of the equal force F2 in the second elastic member 105A is opposite to the direction of the pressure F1, and the direction of the equal force F3 in the second elastic member 105B is the same as the direction of the pressure F1, so that the second elastic member 105A is in a tensile state to generate the equal force F2, and the second elastic member 105B is in a tensile state to generate the equal force F3.

[0065] Furthermore, the component of the pressure F1 perpendicular to the plane of the second elastic members 105A and 105B causes pressure bending deformation of the second elastic members. This pressure bending deformation further increases the internal stress of the second elastic members, leading to yielding of the second elastic members, which may result in a sudden change in the natural frequency of the transducer 7 and cause the transducer to fail. In the present 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 60 degrees and greater than or equal to 0 degrees, which effectively reduces the component of the pressure F1 perpendicular to the plane of the second elastic members 105A and 105B and reduces the pressure bending deformation of the second elastic members 105A and 105B caused by the pressure F1.

[0066] Importantly, the inventors discovered that the distance between the equal force F2 in the second elastic member 105A and the equal force F3 in the second elastic member 105B is particularly important for moment balance, and after extensive experiments and taking into consideration the feasibility of the production process, they found that in the direction along the longitudinal axis L2 of the drive shaft, the center line L3 of the second elastic member 105A is at least 3.5 mm away from the center line L4 of at least one of the second elastic members 105B, and that the center line is located in the plane of the second elastic members 105A and 105B and is the center line of the second elastic member plane oriented from the rack protrusion 111 to the transducer rack portion 112 enveloping the drive shaft, and the center line can also be understood as the center line of the second elastic member plane oriented from the transducer rack 110 to the transducer rack portion 112 enveloping the drive shaft. Since the center line L3 of at least one proximal end second elastic member is at least 3.5 mm away from the center line L4 of at least one distal end second elastic member, torsional deformation of the second elastic member 105 due to pressure F1 in the cleaning element 3 can be more effectively avoided than in the case where only one second elastic member 105A is used, thereby avoiding excessive stress on the second elastic member and preventing failure of the transducer 7.

[0067] Continuing to refer to FIGS. 8, 9, and 10, in the present invention, the cleaning element pressure F1 and the moment M due to the cleaning element pressure F1 are generated by the elongation or compression of the material of the second elastic member 105A and the second elastic member 105B. F The point of application of the force of the second elastic member 105A at the proximal end to the corresponding drive shaft 101 is point O1, and the moment M due to the cleaning element pressure F1 is F is the moment of the cleaning element pressure F1 relative to point O1, and the moment M F The direction of the force is clockwise. According to the stress analysis and moment balance of FIG. 8, the material of the second elastic member 105A and the second elastic member 105B are stretched, and the stretched distance of the second elastic member 105A is Y1, and the stretched distance of the material of the second elastic member 105B is Y2. According to Hooke's law, Y2 is proportional to (F3 / E), and the equivalent force F3 in the second elastic member 105B is proportional to the moment MF where E is the elastic modulus of the material of the second elastic member 105B. In the present invention, the material of the second elastic member 105B is plastic, the material of the first elastic member 104 is metal, and the elastic modulus of the material of the first elastic member 104 is 20 times or more than the elastic modulus of the material of the second elastic member 105B. In the present invention, the plastic second elastic member 105B is creatively introduced, so that under the same cleaning element pressure F1 and the same F3, the plastic second elastic member 105B can generate an elongation distance Y2 of the material of the second elastic member 105B that is 20 times or more greater than that of the metal second elastic member 105B, since Y2 is proportional to (F3 / E).

[0068] In another alternative embodiment, when the second elastic member 105A, 105B is rotated 180 degrees about the longitudinal axis L2 of the drive shaft, Y2 is the distance the material of the second elastic member 105B is compressed, and therefore Y2 is the distance the material of the second elastic member 105B is stretched or compressed.

[0069] Advantageously, a pressure alarm mechanism for an electric toothbrush can be configured based on the proximal end elastic member 105A, the distal end elastic member 105B, and the drive shaft of the transducer rack, configured to issue an alarm when the cleaning force applied to the brush head exceeds a predetermined value. The pressure alarm mechanism includes a sensor device, the sensor device including at least one movable member, the movable member being disposed on the magnet or the transducer rack at the distal end of the drive shaft, preferably disposed on the distal end of the magnet or the distal end of the transducer rack along a longitudinal axis L2, and when a cleaning force F1 is applied to the proximal end, the movable member generates a third displacement Y3 along a second direction, and when the cleaning force F1 reaches a maximum pressure F1, the movable member generates a third displacement Y3 along a second direction. M When the displacement of the movable member exceeds this value, the displacement of the movable member generates an alarm indication in the alarm device of the pressure alarm mechanism.

[0070] 8, cleaning element pressure F1 causes second resilient member 105B and the portion of the drive shaft at that position to experience displacement Y2 in a direction opposite to cleaning element pressure F1. Cleaning element pressure F1 causes portions of transducer rack 110 and magnets that are farther from the cleaning element 3 relative to second resilient member 105A to experience displacement Y3 in a direction opposite to cleaning element pressure F1. Because second resilient member 105B and second resilient member 105A are fixedly coupled to transducer rack portion 112 that envelops the drive shaft, displacement Y3 and displacement Y2 are directly proportional to each other.

[0071] 4, the movable member includes a rack follower block 114 located at the rear end of the transducer rack 110, away from the cleaning element 3. The rack follower block 114 has a convex shape. Under cleaning element pressure F1, the second elastic member 105B is elastically deformed. The rack follower block 114 generates a displacement Y3 in the opposite direction to the cleaning element pressure F1, and the displacement Y3 increases as the cleaning element pressure F1 increases. Sensor devices such as an LED light source 402 and a photosensitive element 401 are disposed on both sides of the circuit board 4 adjacent to the rack follower block 114. When the light flux received by the photosensitive element 401 changes, a corresponding change occurs in the equivalent resistance of the photosensitive element 401. The circuit board 4 detects the magnitude of the equivalent resistance of the photosensitive element 401 to sense the change in pressure F1. When the user increases the pressure F1 applied to the cleaning element 3, the displacement Y3 of the rack tracking block 114 increases, causing the rack tracking block 114 to move further into the gap between the light source 402 and the photosensitive element 401, reducing the luminous flux from the light source 402 obtained by the photosensitive element 401 and increasing the equivalent resistance of the photosensitive element 401. The circuit board 4 detects this increase in the equivalent resistance of the photosensitive element 401 and recognizes that the cleaning element pressure F1 is increasing. When the magnitude of the cleaning element pressure F1 reaches a preset threshold, the electric toothbrush can use sound, light, vibration, or other methods to warn the user that the pressure F1 applied to the cleaning element is too large and to prompt 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 rack follower block 114 decreases, causing the rack follower block 114 to reduce the gap between the light source 402 and the photosensitive element 401, increasing the luminous flux from the light source 402 obtained by the photosensitive element 401 and reducing the equivalent resistance of the photosensitive element 401. The circuit board 4 detects the reduction in the equivalent resistance of the photosensitive element 401 and recognizes that the cleaning element pressure F1 is increasing. If the cleaning element pressure F1 is below the preset threshold for excessive pressure, the electric toothbrush will terminate the warnings in the form of sound, light, vibration, etc.

[0072] In this embodiment of the present invention, the introduction of the second elastic member 105B made of plastic or mainly made of plastic effectively amplifies the displacement Y3, i.e., the displacement of the magnet and the part of the transducer rack 110 that is farther from the cleaning element 3 than the second elastic member 105A, in the direction opposite to the cleaning element pressure F1, which is generated by the cleaning element pressure F1.

[0073] The embodiment of the alarm mechanism may be modified as appropriate. For example, a through-hole may be provided in the rack follower block 114. When the cleaning element pressure F1 becomes zero, no light from the light source 402 passes through the through-hole in the rack follower block 114, or only a small amount of light passes through, and is incident on the photosensitive surface of the photosensitive element 401. The remaining part of the rack follower block 114 blocks the light from the light source 402 from being incident on the light-receiving surface of the photosensitive element 401, thereby increasing the equivalent resistance of the photosensitive element 401. When the cleaning element pressure F1 increases, more of the light from the LED 402 passes through the through-hole in the rack follower block 114 and is incident on the photosensitive surface of the photosensitive element 401, thereby decreasing the equivalent resistance of the photosensitive element 401, allowing the circuit board 4 to detect the magnitude of the cleaning element pressure F1.

[0074] In the above embodiment, the rack tracking block 114 has a convex shape relative to the magnet surface, but of course, the rack tracking block 114 may also have a concave shape, a flat shape, or a curved shape, and by utilizing the displacement Y3 of any of these surfaces, at least one surface of the rack tracking block 114 is moved closer to or further away from the photosensitive element 401, thereby changing the incident angle at which the photosensitive element 401 can receive light from the light source 402, and the amount of light flux on the photosensitive element 401 changes monotonically with the monotonous change in the cleaning element pressure F1.

[0075] A magnet can be used as the movable member of the sensor device, and the displacement Y3 of the magnet away from the cleaning element can be used to attach a magnetic field induction element such as a Hall element or a coil to the circuit board 4, so that the displacement Y3 of the magnet changes the magnetic field strength of the magnetic field induction element, forming a change in the voltage value of the magnetic field induction element, thereby enabling the circuit board 4 to detect the magnitude of the cleaning element pressure F1.

[0076] Preferably, the energy exchange device is configured to have an actuation pressure F4. Specifically, a spring can be attached to a portion of the transducer rack 110 farther from the cleaning element than the second elastic member 105A and the magnet to pre-tighten the magnet, and the proximal end second elastic member and the distal end second elastic member generate displacements Y2 and Y3 only when the cleaning element pressure F1 is greater than the cleaning element actuation pressure F4.

[0077] As the pressure F1 increases, the forces F2 and F3 on the elastic member increase, and the increased F2 and F3 cause the second elastic member to yield and lose elasticity. In the present invention, the energy exchange device reduces the pressure F1 to a maximum pressure F1 M The energy exchange device further includes a maximum pressure limiting section that limits the maximum pressure F1 M 9, the circuit board has a through hole 403 through which the rack follower block 114 can pass and contact the handle housing. M If the pressure F1 is equal to or greater than the maximum pressure F1, the rack follower block 114 contacts the handle housing, and the handle housing constitutes a maximum pressure limiting portion, restricting the further movement of the rack follower block 114, so that the displacements Y2 and Y3 do not become larger any more, thereby ensuring that the second elastic member is always within the range of elastic deformation. M Only when the pressure F1 is smaller than the cleaning element activation pressure F4, the displacements Y2 and Y3 change monotonically with a monotonous change in the pressure F1.

[0078] For electric toothbrushes, preferably the cleaning element maximum pressure F1 M The range of the cleaning element pressure F1 is 2.5N to 10N, and the cleaning element activation pressure F4 is 0N or more and 2N or less. M As displacement Y2 and displacement Y3 continue to increase monotonically beyond , the handle housing or a part stationary relative to the handle housing constrains transducer 7 such that displacement Y2 and displacement Y3 no longer change monotonically.

[0079] Based on the above resonance analysis and mechanical analysis, it is found that the pressure F1 of the cleaning element 3 causes excessive bending deformation of the first elastic members 104A, 104B. However, the present invention introduces the second elastic members 105A, 105B to balance the force and moment caused by the pressure F1 of the cleaning element 3, thereby significantly reducing the excessive bending deformation of the first elastic members 104A, 104B caused by the pressure F1 of the cleaning element 3, thereby enabling the transducer 7 to operate at resonance and have a long life. The influence of the second distal elastic member 105B on the spring stiffness coefficient at the natural frequency of the transducer is limited, facilitating frequency tuning of the transducer 7. The first elastic members 104A, 104B and the second elastic members 105A, 105B can be completed by an injection molding process, which facilitates the manufacturing of the transducer 7.

[0080] As a modified example of the first embodiment, only one first elastic member may be used, such as only the upper first elastic member 104A located on the left side of the drive shaft in FIG. 4, or only the lower first elastic member 104B located on the right side of the drive shaft in FIG. 4. The above requirements for the combination of first elastic members can be met with a single first elastic member, and the object of the present invention can be achieved with a single first elastic member.

[0081] As another variation of the first embodiment, there may be only two second elastic members, one second elastic member 105A located on the left side of the drive shaft in Fig. 4 and one second elastic member 105B located on the right side of the drive shaft in Fig. 4, and the two second elastic members are located on opposite sides of the medial plane P and on opposite sides of a vertical plane perpendicular to the medial plane P and having the longitudinal axis L2. The combination of one second elastic member 105A and one second elastic member 105B can also satisfy the requirements of the present invention for the combination of second elastic members and achieve the object of the present invention.

[0082] In other variants, the second elastic members may be located on the same side of the median plane P or on the same side of a vertical plane perpendicular to the median plane P and comprising the longitudinal axis L2.

[0083] 10 and 11 show perspective views of an energy exchange device according to a second embodiment of the present invention, in which the magnet coil mechanism of the energy exchange device has a different structure from that of the first embodiment. As shown in FIGS. 10 and 11, the drive coil 221 is centrally disposed with respect to the longitudinal axis L2 of the drive shaft, the magnets 202 and 203 are respectively distributed on both sides of the drive coil 221, the transducer rack 110 extends on both sides of the longitudinal axis L2 of the drive shaft and further downward to form two support arms 115, and the two magnets are fastened to each support arm 115, and the magnetic field generated by the magnets passes through the drive coil. Based on the same analysis as above, the object of the present invention can also be achieved by the arrangement of the magnets 202 and 203 and the drive coil 221 shown in FIGS. 10 and 11.

[0084] 12 and 13 show perspective views of a transducer according to a third embodiment of the present invention. Referring to Figures 12 and 13, a hollow cylindrical magnet 302 is fastened to drive shaft 101, and drive coils 321, 322, 323, and 324 are arranged around the outside of the hollow cylindrical magnet, and the magnetic field generated by the magnet passes through the drive coils. Based on the same analysis as above, the object of the present invention can also be achieved by the arrangement of magnets and drive coils shown in Figures 12 and 13.

[0085] Of course, the relative positions of the magnet and drive coil and the elastic member and cleaning element 3 may be varied, for example the magnet and drive coil being closer to the cleaning element 3 or the magnet and drive coil being interposed between two second elastic members.

[0086] In the energy exchange device of the conventional cleaning tool, the fixed end or stationary end of the elastic member is located on the longitudinal axis of the drive shaft, and a cn is the distance from the driving force to the longitudinal axis of the driving shaft, and is also a in the stiffness coefficient calculation formula for the elastic member. The force pair of the driving force is a cn In order to ensure a sufficient force pair while keeping the driving force small, a cnThe elastic member needs to be sufficiently large. In order to maintain an appropriate stiffness coefficient of the elastic member, the size of the elastic member is somewhat large. In addition, since the other end of the elastic member is fixedly connected to the transducer transmission arm, the conventional energy exchange device has a large size.

[0087] As a result, in this embodiment, the first elastic member 104 receives the electromagnetic torque M1 of the drive shaft. The transducer rack 110 is provided with two rack fastening arms 113, each of which fixedly couples another edge 106 of the corresponding first elastic member 104A, 104B. The edge 107 of the first elastic member 104A, 104B is fixedly coupled to a transducer rack portion 112. The transducer rack portion 112, which surrounds the drive shaft, encloses a portion of the drive shaft 110, and the first elastic members 104A, 104B extend between the rack fastening arms 113 and the transducer rack portion 112, which surrounds the drive shaft. The distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first elastic member is a in the elastic member stiffness coefficient calculation formula. Since there is no direct relationship between the distance from the longitudinal axis L2 of the drive shaft to the other end 106 of the first elastic member and the force arm of the electromagnetic force pair M1, the distance from the longitudinal axis L2 of the drive shaft to the edge 106 of the first elastic member may be sufficiently small, the size of the elastic member may be smaller, and the overall size of the transducer 7 may be smaller, thereby realizing the miniaturization of the cleaning device.

[0088] In the first embodiment, when the transducer 7 is in a resonant state, the displacement Y3 caused by the cleaning element pressure F1 is amplified by the displacement distribution along the longitudinal axis L2 of the drive shaft between the second elastic member 105A and the plastic second elastic member 105B, thereby enabling detection of the cleaning element pressure F1. Detection of the cleaning element pressure F1 is necessary in some cleaning tools, such as electric toothbrushes, where excessive cleaning element pressure F1 can injure the gums and require the user to pay attention to the magnitude of pressure F1. However, in other applications, the cleaning tool does not require detection of the cleaning element pressure F1, but the transducer and cleaning assembly are within the resonant range and a larger cleaning element pressure F1 is desirable. Therefore, the present invention provides a fourth embodiment of the energy exchange device shown in Figures 14, 15, 16, and 17, in which the material of all the second elastic members in the above-mentioned embodiments is replaced with metal.

[0089] In the fourth embodiment, the transducer 7' includes a drive shaft 501, two proximal end elastic members 505A distributed along the longitudinal axis L2 of the drive shaft, two distal end elastic members 505B distributed along the longitudinal axis L2 of the drive shaft, a magnet 502, a magnet 503, and a transducer rack 510. The two magnets 502 and 503 are both fixed to the transducer rack 510. The transducer rack 510 is made of plastic, and the drive shaft 501, the proximal end elastic member 505A, and the distal end elastic member 505B are connected via the transducer rack 510, and the magnets 502 and 503 are fixedly connected to the tail portion of the transducer rack away from the cleaning element using adhesive, screws, or injection molding.

[0090] In the fourth embodiment, the elastic assembly of the transducer 7' should include at least one proximal elastic member 505A and one distal elastic member 505B, and one second proximal elastic member 505A and one second distal elastic member 505B are located on opposite sides of the mid-plane P on which the longitudinal axis L2 of the drive shaft is located. The one proximal elastic member 505A and one distal elastic member 505B distributed on both sides of the mid-plane P can withstand 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.

[0091] In the fourth embodiment of the present invention, the transducer 7' comprises two proximal end elastic members 505A and two distal end elastic members 505B, and the proximal end elastic members 505A and the distal end elastic members 505B are offset back and forth along the longitudinal axis L2 with different inclination angles, where the proximal end elastic member 505A is closer to the proximal end of the drive shaft 501 than the distal end elastic member 505B.

[0092] Similar to the configuration of the first embodiment, the transducer rack 510 includes a rack portion 512 that encircles the drive shaft and a rack fastening arm 513, and a rack protrusion 511 protrudes from the rack fastening arm 513. The proximal end elastic member 505A and the distal end elastic member 505B are fixedly coupled to the rack protrusion 511 and the rack portion 512 that encircles the drive shaft, respectively.

[0093] 15, the transducer rack 510 is distributed with four rack protrusions 511, each of which fixedly couples an edge 508 of a corresponding elastic member 505A, 505B, and another edge 509 of the elastic members 505A, 505B is fixedly coupled to a transducer rack portion 512 that encircles the drive shaft 501, and the elastic members 505A, 505B extend between the rack protrusions 511 and the transducer rack portion 512 that encircles the drive shaft. In another alternative embodiment, instead of the rack protrusions 511, the rack fastening arm 513 may be thickened without affecting the implementation of the present invention.

[0094] The elastic members 505A and 505B are approximately rectangular parallelepipeds. The distance from the rack protrusion 511 of each elastic member 505A or 505B to the transducer rack portion 512 enveloping the drive shaft is the length of the elastic member. The distance along the longitudinal axis of the drive shaft of each elastic member 505A or 505B is the width of the elastic member. The length of the other side of the rectangular parallelepiped is the thickness of the elastic member. The plane formed by the length and width of each elastic member 505A or 505B is the elastic member plane. The elastic member plane is a plane connecting the rack protrusion 511 and the transducer rack 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 members 505A or 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, or in other words, the angle between the planes of the elastic members 505A, 505B and the medial plane P is 30 degrees. It should be understood that in other alternative embodiments, δ1, δ2, δ3, and δ4 can have different values.

[0095] In the fourth embodiment, the proximal end elastic member 505A and the distal end elastic member 505B are both made of metal. The elastic members 505A and 505B can be formed as two independent elastic bodies along the longitudinal axis, as shown in FIG. 16 . Each of the two elastic bodies includes two symmetrically arranged elastic members. Each independent elastic body has through-holes at its middle and both ends, which secure the elastic body to the longitudinal axis of the transducer rack. In another alternative embodiment, four independent elastic members may be combined to form an elastic member assembly. Of course, the transducer elastic members may have other mounting configurations within the scope of the present invention.

[0096] As shown in FIG. 14, the tail of the transducer rack away from the cleaning element surrounds the drive shaft 501, and magnets 502 and 503 are symmetrically distributed on both sides of the longitudinal axis L2 of the drive shaft. The first and second drive coils are located on either side of the longitudinal axis L2 of the drive shaft, respectively, and do not move relative to the handle housing. Magnets 502 and 503 have opposite magnetic poles when facing the same drive coil. For example, the magnetic pole of magnet 502 facing the second drive coil is a south pole, and the magnetic pole of magnet 503 facing the second drive coil is a north pole. The direction of current I in the first and second drive coils is perpendicular to the direction of the magnetic field lines inside magnets 502 and 503.

[0097] The motion analysis of the transducer 7' in the fourth example is similar to the motion analysis of the transducer 7 in the first embodiment, and the description thereof will not be repeated here.

[0098] In the fourth embodiment of the present invention, the material of the proximal end elastic member 505A and the distal end elastic member 505B is metal. According to the solid mechanics principle, in the bending elastic deformation state, the elastic member is equivalent to a linear spring. Taking a rectangular parallelepiped elastic member as an example, the stiffness coefficient of the linear spring equivalent to the elastic member is K=3*E*I z / (a 3 ), where E is the modulus of elasticity of the material and I z is the moment of inertia of the elastic member in response to the driving force or moment, and a is the distance from the point of application of the driving force on the elastic member to another edge 508 of the elastic member where the elastic member rests relative to the handle housing.

[0099] The driving frequency f0 is the machine natural frequency f n When an alternating current I of frequency f0 flows through the driving coil, the transducer 7' and cleaning assembly are subjected to an electromagnetic force of frequency f0, and the frequency f0 of the driving force is equal to the natural frequency f of the transducer 7. n According to the principle of simple harmonic motion, the frequency of the driving force f0 is generally between 85% and 115% of the natural frequency of the machine f nIf the value is between 85% and 115%, the mechanical part is in forced resonant motion, and the efficiency of the conversion of electrical energy into mechanical energy in the resonant motion and sympathetic motion can be considered high.

[0100] Similarly, referring to FIG. 8 , the pressure applied to the cleaning element 3 is F1, the equivalent force at the proximal end elastic member 505A is F2, and the equivalent force at the distal end elastic member 505B is F3. The pressure F1 applied to the cleaning element 3 is parallel to the longitudinal axis L1 of the cleaning element, i.e., perpendicular to the medial plane P. Referring to FIG. 17 , in the fourth embodiment, the angle between the plane of the elastic members 505A and 505B and the longitudinal axis L1 of the cleaning element is angle δ, which is less than 80 degrees and is 60 degrees in this embodiment. When pressure F1 is applied to the cleaning element 3, the elastic members 505A and 505B can generate a component force parallel to the longitudinal axis L1 of the cleaning element. The edge 509 of the elastic members 505A, 505B is fixedly connected to the transducer rack portion 512 that envelops the drive shaft, and another edge 508 is fixedly connected to the rack protrusion 511, so that according to the principles of moment balance and force balance, the direction of the equal force F2 in the proximal end elastic member 505A is opposite to the direction of the pressure F1, and the direction of the equal force F3 in the distal end elastic member 505B is the same as the direction of the pressure F1, and the proximal end elastic member 505A is in a tensile state to generate the equal force F2, and the distal end elastic member 505B is in a tensile state to generate the equal force F3. The component of pressure F1 perpendicular to the plane of the elastic members causes pressure bending deformation of the elastic members 505A and 505B, which further increases the internal stress of the elastic members, leading to yielding of the elastic members, thereby causing a sudden change in the natural frequency of the transducer 510 and potentially causing the transducer to fail. To avoid transducer failure, in the present invention, angle δ is less than 80 degrees and greater than or equal to 0 degrees. More preferably, angle δ is less than 60 degrees and greater than or equal to 0 degrees, which effectively reduces the component of pressure F1 perpendicular to the plane of the third elastic member and reduces the pressure bending deformation of the third elastic member caused by pressure F1.

[0101] Similarly, it is important to note that the distance between the equal force F2 in the proximal-end elastic member 505A and the equal force F3 in the distal-end elastic member 505B is particularly important for moment balance. After extensive experimentation and taking into consideration the feasibility of the production process, it was determined that the center line L5 of the proximal-end elastic member in the direction along the longitudinal axis L2 of the drive shaft is at least 3.5 mm away from the center line L6 of the distal-end elastic member, the center line being located in the plane of the elastic members and oriented from the rack fastening arm 513 to the transducer rack portion 512 enveloping the drive shaft. As shown in FIG. 14 , the center line L5 of at least one third proximal-end elastic member is at least 3.5 mm away from the center line L6 of the third distal-end elastic member, which more effectively prevents torsional deformation of the elastic members 505A, 505B due to the pressure F1 in the cleaning element 3 than when only one proximal-end elastic member 505A is used, thereby avoiding excessive stress on the elastic members and preventing the transducer from failing.

[0102] As a variation of the fourth embodiment of the present invention, there may be only two elastic members 505, for example, one proximal end elastic member 505A located on the left side of the drive shaft in FIG. 15 and one elastic member 505B located on the right side of the drive shaft in FIG. 15, which still satisfies the requirements for the combination of elastic members of the present invention.

[0103] The magnet distribution and magnet position are the same as those in the analyses of Figures 10, 11, 12, and 13, and the description thereof will not be repeated here. The above various combinations all fall within the scope of protection of the present invention.

[0104] Obviously, similar to the first embodiment, the metal proximal end elastic member 505A and distal end elastic member 505B in the fourth embodiment can also realize the discrimination of the pressure F1 of the cleaning element. M The range of the pressure is 3N to 15N, and the cleaning element activation pressure F4 is 0N or more and 2.5N or less.

[0105] The energy exchanger of the present invention introduces a resilient member offset along the drive shaft to balance the force and moment due to pressure F1 on the cleaning element, reducing the excessive bending deformation of the resilient member due to pressure F1 on the cleaning element 3, thereby enabling the transducer to operate at resonance for a longer life, while ensuring that the transducer and cleaning assembly remain within the resonance range, allowing for greater force to be applied to the cleaning element. The resilient member arrangement of the present invention also allows for a more compact cleaning device.

[0106] The energy transmission efficiency in the resonant state or resonance state is very high. In conventional drive structures using bearings (e.g., ball bearings), a restraining member such as a bearing is provided to prevent the cleaning element from moving in a manner other than rotational motion. However, such restraints result in noise, energy loss, and increased costs. According to the present invention, the elastic member and permanent magnet are rationally arranged to achieve smooth rotation of the transducer, thereby eliminating the restraining member previously required for rotational rotation of the cleaning tool. By rationally arranging the permanent magnet, the combined electromagnetic force received by the transducer 7 is nearly zero, and by skillfully utilizing the torque acting on the transducer 7, the restraining structure can be eliminated, resulting in a more compact cleaning tool structure, smoother rotation, and reduced noise.

[0107] Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes and alterations made to the above embodiments based on the contents that do not deviate from the technical solution of the present invention and the technical essence of the present invention fall within the scope of protection defined in the claims of the present invention. [Explanation of symbols]

[0108] 1 handle 2 cleaning element carriers 3 Cleaning Elements 4 Circuit Board 5 batteries 7, 7' transducer 101 Drive shaft 102 First Magnet 103 Second Magnet 104 First elastic member 104A first elastic member 104B first elastic member 105 second elastic member 105A proximal end second elastic member 105B distal end second elastic member 106 Edge of first elastic member 107 Edge of first elastic member 108 Edge of second elastic member 109 Edge of second elastic member 110 Transducer Rack 111 Rack protrusion 112 Transducer rack portion enveloping the drive shaft 113 Rack fastening arm 114 Rack follower block 115 Support Arm 121 First drive coil 122 Second drive coil 131 Transducer upper case 132 Transducer lower case 133 Fastening screws 134 Drive coil holder 135 Battery Box 202 Magnet 203 Magnet 221 Drive coil 204A, 204B First elastic member 302 Cylindrical magnet 321, 322, 323, 324 drive coils 401 Photosensitive element 402 Light source 501 Drive shaft 502 First Magnet 503 Second Magnet 505A Proximal end elastic member 505B Distal end elastic member 508 Edge of elastic member 509 Edge of elastic member 510 Transducer Rack 511 Rack protrusion 512 Transducer rack part enveloping the drive shaft 513 Rack fastening arm L1 Vertical axis of cleaning element L2 Longitudinal axis of drive shaft L3 Center line of the proximal end second elastic member L4: Center line of the distal end second elastic member L5 Center line of proximal end elastic member L6 Center line of distal elastic member α1, α2, α3, α4: the angle between the plane of the second elastic member and the longitudinal axis of the cleaning element β1, β2, β3, β4: the angle between the plane of the first elastic member and the longitudinal axis of the cleaning element δ1, δ2, δ3, δ4: the angle between the plane of the elastic member and the longitudinal axis of the cleaning element

Claims

1. An energy exchange device used in a cleaning and nursing tool, A transducer (7, 7') and a driving coil (121, 122, 221, 321, 322, 323, 324), the transducer comprises a transducer rack (110, 510), a magnet attached to the transducer rack, a resilient assembly attached to the transducer rack, and a drive shaft (101, 501), the drive shaft having a proximal end and a distal end, and the drive shaft is fixedly coupled to the transducer rack, the drive shaft defining a longitudinal axis (L2), the longitudinal axis extending through a mid-plane (P) substantially perpendicular to a direction of a cleaning force (F1) in the cleaning and nursing tool; the drive coil is positioned relative to the magnet of the transducer (7, 7'), the transducer being movable relative to the drive coil; the elastic assembly comprises at least one proximal end elastic member (105A, 505A) and at least one distal end elastic member (105B, 505B) offset along the longitudinal axis (L2), the proximal end elastic member being closer to the proximal end of the drive shaft than the distal end elastic member; the proximal end elastic member (105A, 505A) and the distal end elastic member (105B, 505B) each have a first edge (109, 509) and a second edge (108, 508), the first edge (109, 509) is fixedly coupled to the drive shaft and moves along with the drive shaft, the second edge (108, 508) constitutes a fixed edge when the proximal end elastic member and the distal end elastic member are elastically deformed, and the respective planes of the proximal end elastic member (105A, 505A) and the distal end elastic member (105B, 505B) extend substantially radially outward from the longitudinal axis, the plane of the proximal end elastic member forms a first angle with respect to the median plane (P); the plane of the distal end elastic member forms a second angle with respect 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. Energy exchange device.

2. 2. The energy exchange device according to claim 1, wherein the distance between the center lines of the proximal end elastic member and the distal end elastic member along the width of the longitudinal axis is at least 3.5 mm.

3. The proximal end elastic member and the distal end elastic member are located on opposite sides of the medial plane or on the same side of the medial plane, and the proximal end elastic member and the distal end elastic member are located on opposite sides or on the same side of a vertical plane that is perpendicular to the medial plane (P) and includes the longitudinal axis; Alternatively, the energy exchange device according to claim 1 or 2, wherein the proximal end elastic member and the distal end elastic member are arranged along the direction of the vertical plane.

4. The energy exchange device described in claim 1 or 2, characterized in that the proximal end elastic member is made of plastic or metal, or is configured so that 60% or more of the stiffness coefficient of the proximal end elastic member is made of plastic or metal, and the distal end elastic member is made of plastic, or is configured so that 60% or more of the stiffness coefficient of the distal end elastic member is made of plastic.

5. The energy exchange device according to claim 1 or 2, characterized in that the proximal end elastic members are arranged in pairs symmetrically with respect to the longitudinal axis, and the distal end elastic members are arranged in pairs symmetrically with respect to the longitudinal axis.

6. The elastic assembly further comprises at least another elastic member (104A, 104B), the at least another elastic member being constructed of metal and offset relative to the proximal end elastic member and the distal end elastic member along the longitudinal axis, the angle between a plane of the at least another elastic member and the medial plane being smaller than the angle between a plane of the proximal end elastic member and the distal end elastic member and the medial plane; 2. The energy exchange device according to claim 1, wherein the modulus of elasticity of the other elastic member is 20 times or more the modulus of elasticity of the distal end elastic member.

7. The transducer rack includes a transducer rack portion (112) that encircles the drive shaft and a pair of rack fastening walls (113) that are radially spaced from the drive shaft; The rack fastening wall (113) has an upper convex portion and a lower convex portion, and the upper convex portion and the lower convex portion are offset from each other on the rack fastening wall, The energy exchange device according to claim 1, characterized in that the first edge portion is fixed to the transducer rack portion, and the second edge portion is fixed to the upper convex portion and the lower convex portion of the rack fastening wall, respectively.

8. the drive coil is arranged so as not to move relative to the housing of the cleaning and nursing tool, the drive coil is arranged in a magnetic field generated by the magnet, and an angle formed between the magnetic field lines generated by the magnet (102, 103, 202, 203, 302) and the direction of the current I in the drive coil (121, 122) is approximately 90 degrees; The driving coil is applied with a frequency f ０ 2. The energy exchange device according to claim 1, wherein an alternating current I flows, whereby the drive coil and the magnet interact with each other to generate a reciprocating force pair with the longitudinal axis (L2) of the drive shaft as its axis, and the reciprocating force pair drives the transducer to resonate.

9. A pressure alarm mechanism for use in a cleaning and nursing tool, comprising: a drive shaft (101) defining a longitudinal axis and having a proximal end and a distal end, a drive member attached to the drive shaft from the distal end of the drive shaft, the proximal end undergoing a first displacement along a first direction when a cleaning force (F1) of the cleaning and nursing implement is along the first direction; a proximal end elastic member (105A, 505A) having a first edge (109) fixedly coupled to the drive shaft and moving along with the drive shaft, the position of which constitutes a fulcrum of the drive shaft; a distal end elastic member (105B, 505B) offset toward the distal end along a longitudinal axis relative to the proximal end elastic member, a first edge (109) fixedly coupled to the drive shaft and moving along with the drive shaft, and when the cleaning force (F1) is applied to the proximal end, the drive shaft at the position of the first edge undergoes a second displacement along a second direction opposite to the first direction; A sensor device having a fixed member and a movable member, wherein the movable member is provided in the driving unit, and when the cleaning force (F1) is applied to the proximal end, the movable member generates a third displacement along a second direction relative to the fixed member, and the cleaning force (F1) reaches a maximum pressure (F1 Ｍ a movable member that generates an alarm indication in an alarm device of the pressure alarm mechanism when the displacement of the movable member relative to the fixed member exceeds a predetermined value, the longitudinal axis extends through the medial plane; the mid-plane being substantially perpendicular to the cleaning force; the plane of the proximal end elastic member forms a first angle with respect to the median plane (P); the plane of the distal end elastic member forms a second angle with respect to the median plane; The first angle and the second angle are equal to or greater than 10 degrees and equal to or less than 90 degrees. Pressure warning mechanism.

10. Each of the proximal end elastic member (105A, 505A) and the distal end elastic member (105B, 505B) has a second edge portion (108, 508) facing the first edge portion, and the second edge portion (108, 508) constitutes a fixed edge portion when the proximal end elastic member and the distal end elastic member are elastically deformed, 10. The pressure warning mechanism of claim 9, wherein the distance between the centerlines of the proximal and distal elastic members along the width of the longitudinal axis is at least 3.5 mm.

11. The pressure warning mechanism described in claim 9 or 10, characterized in that the proximal end elastic member and the distal end elastic member are located on opposite sides of the medial plane or on the same side of the medial plane, and the proximal end elastic member and the distal end elastic member are located on opposite sides or on the same side of a vertical plane that is perpendicular to the medial plane (P) and includes the longitudinal axis, or the proximal end elastic member and the distal end elastic member are arranged along the direction of the vertical plane.

12. the drive unit includes a magnet and a rack, the magnet being attached to a distal end of the drive shaft via the rack; 10. The pressure warning mechanism according to claim 9, wherein the movable member is farther from the proximal end elastic member than the proximal end of the drive shaft.

13. the fixed member of the sensor device includes an inductive element and an emission source, a gap is formed between the inductive element and the emission source, and the movable member includes a barrier block that is movably inserted into the gap between the inductive element and the emission source; 10. The pressure warning mechanism of claim 9, wherein the inductive element and the emission source comprise at least one of an electric, a magnetic, or an optical inductive element and emission source.

14. 14. The pressure alarm mechanism of claim 13, wherein the inductive element and the emission source are mounted on the housing of the cleaning and care implement or on a part fixed to the housing.

15. The pressure warning mechanism is Ｍ a pressure limiting portion that limits the movement range of the movable member so that the force applied to the movable member is within a range of 2.5 N to 15 N; 10. The pressure warning mechanism according to claim 9, wherein the pressure limiting portion is mounted on the housing of the cleaning and nursing tool or on a part fixed to the housing.

16. The cleaning and nursing tool further includes a drive coil arranged so as not to move relative to the housing of the cleaning and nursing tool, the drive coil being arranged in a magnetic field generated by the magnet of the drive unit, and the angle formed between the magnetic field lines generated by the magnet (102, 103, 202, 203, 302) and the direction of the current I in the drive coil (121, 122) is approximately 90 degrees; The driving coil is applied with a frequency f ０ 16. The pressure warning mechanism of claim 15, wherein an alternating current I flows through the drive coil and the magnet, causing the drive coil and the magnet to interact with each other to generate a reciprocating force pair whose axis is the longitudinal axis (L2) of the drive shaft, and the reciprocating force pair drives a transducer comprising the drive shaft, the proximal end elastic member, and the distal end elastic member to resonate.

17. A cleaning and nursing tool having the energy exchange device described in any one of claims 1, 2, and 6 to 8 or the pressure warning mechanism described in any one of claims 9, 10, and 12 to 16, wherein the cleaning and nursing tool is one of an electric toothbrush, an electric shaver, an electric facial washer, and an electric bath tub.

18. a transducer including the drive shaft, the proximal end elastic member, and the distal end elastic member; a drive coil disposed so as not to move relative to the housing of the cleaning and nursing tool; Furthermore, the drive coil is disposed in a magnetic field generated by a magnet provided in the transducer; The transducer (7) and the cleaning assembly of the cleaning care tool constitute a resonator, and the driving coil and the magnet interact to generate a reciprocating force pair with the longitudinal axis (L2) of the driving shaft as an axis, and the reciprocating force pair drives the resonator to resonate, and the resonator has a natural frequency f ｎ is the frequency f of the reciprocating force pair ０ 18. The cleaning and nursing tool according to claim 17, wherein the cleaning and nursing tool is between 85% and 115% of the above.

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