A planar oscillation motor for handheld appliances and handheld appliances comprising the same

Abstract

A planar oscillation motor optimized for handheld appliances such as toothbrushes and razors. The motor features an armature with a body and shaft, and a stator assembly with two stators separated by stator supports. This arrangement allows unrestricted armature movement within a parallel magnetic field. Elastic links connect the armature to the stator assembly, facilitating frictionless oscillation perpendicular to the magnetic field. A toothbrush featuring the planar oscillation motor offers a planar brushing movement. A razor equipped with this motor can be more compact and operate more quietly.

Description

[0001] A PLANAR OSCILLATION MOTOR FOR HANDHELD APPLIANCES AND HANDHELD APPLIANCES COMPRISING THE SAME

[0002] TECHNICAL FIELD

[0003] The present invention pertains to electric motors used in handheld devices.

[0004] BACKGROUND OF THE INVENTION

[0005] Handheld devices such as electric toothbrushes, electric razors, and various reciprocal cutting tools typically incorporate an electric motor that drives an implement. For operations on specific human surfaces like teeth or skin, these implements are more effectively powered by a planar oscillation motor rather than other types of motion power, such as rotary or revolution motion motors. Devices equipped with planar oscillation motors have some utility, but often suffer from difficulty in arrangement for transversal movement, operation control and force control, particularly across various consumers and industrial applications.

[0006] SUMMARY

[0007] The present application relates to an electric motor. In some embodiments, the application includes a planar oscillation motor that may be used with handheld appliances, and a handheld appliance equipped with the planar oscillation motor. In some examples, the handheld appliance may be a toothbrush or a razor.

[0008] In one embodiment, an armature comprising a body and a shaft attached to the body is provided. Further provided is a stator assembly comprising a first stator, a second stator, and stator supports, wherein the first stator and the second stator are separated by stator supports defining a space for unrestricted movement of the armature body within a parallel magnetic field generated between the stators, and one or more elastic links that connect the armature to the stator assembly either (a) directly or (b) indirectly through a third part secured to the stator assembly in such a manner to facilitate frictionless oscillation of the armature on a plane substantially perpendicular to the magnetic field direction.

[0009] In a further embodiment, the armature comprises one or more bearings that assist the elastic links in facilitating said frictionless oscillation by restricting the armature’s tilt relative to the plane perpendicular to the magnetic field direction. One or more of the elastic links may be attached to the stator assembly via one or more stator supports. The bearing can be a rotary type, either co-axially or perpendicularly positioned with the shaft, or a linear bearing placed parallel to the armature's motion plane. In some embodiments, the armature includes a coil, and the stator assembly includes one or more permanent magnets, with the first and second stators coupled to align the magnetic field lines parallel as they intersect the coil. Additionally or alternatively, the armature may contain one or more permanent magnets, and the stator assembly may include coils, which may allow for the magnetic field lines to remain parallel to each other as they cross the coils.

[0010] Some embodiments include a sensor to detect the tilt of the armature relative to a plane perpendicular to the magnetic field direction triggered by external forces on the shaft. This motor can be integrated into various handheld appliances within a handle enclosure.

[0011] As one application, a toothbrush incorporates the planar oscillation motor along with a motor driver and a detachably engaged brush tip, providing planar motion to the brush tip. The toothbrush may also include bearings that limit the armature’s tilt due to external forces on the brush tip, and a driver with a position sensor to monitor the armature's tilt relative to the stator assembly.

[0012] As another application, a razor includes a planar oscillation motor and a cutting implement in cooperative engagement. The razor may include a blade cartridge with a static toothed blade and a dynamic toothed blade that detachably engages the motor through an adaptation joint. Optionally, the dynamic or static toothed blades may be coated with PVD, and an adaptation magnet in the cartridge may enhance the engagement between the blades.

[0013] A control method according to some embodiments involves monitoring the armature's tilt, activating the motor when tilt exceeds a preset threshold, and deactivating it when tilt falls below another preset threshold. The two preset thresholds can be the same. This method may include steps to adjust motor power incrementally either in relation to the time elapsed after reaching the threshold or based on the tilt measurements.

[0014] The configuration of the instant application may advantageously enable adaptable, efficient, and controlled motor operations suitable for a wide range of uses, while still offering the advantages including quieter operation, increased comfort, enhanced performance efficiency, and simpler structural design that can be achieved by a planar oscillation motor.

[0015] Other objects, features, and advantages of this application will become apparent from the following detailed description, which illustrates by way of example the principles of the invention.

[0016] BRIEF DESCRIPTION OF THE DRAWINGS

[0017] A better understanding of the present invention will be had upon reference to the following description in conjunction with the accompanying drawings in which like numerals refer to like parts throughout the views wherein:

[0018] Figure l is a side view of an exemplary embodiment of a planar oscillation motor according to the present invention, highlighting selected sectional components to detail the internal structure.

[0019] Figure 2 is an exploded view of the planar oscillation motor depicted in Figure 1, providing a detailed look at the arrangement and assembly of its components.

[0020] Figure 3 is a view that illustrates how the elastic links are directly secured to the stator assembly in the planar oscillation motor from Figure 1, showing the specific attachment method.

[0021] Figure 4 is a view that depicts the tilt of the armature relative to the stator in the planar oscillation motor from Figure 1.

[0022] Figure 5 is a side view of an exemplary embodiment of a planar oscillation motor with variations in design.

[0023] Figure 6 is an exploded view of the planar oscillation motor shown in Figure 5, detailing the differences in component design and assembly from the first embodiment.

[0024] Figure 7 is a view that shows how the elastic links and the bearing constrain the armature for facilitating its frictionless planar motion in the planar oscillation motor of Figure 5.

[0025] Figure 8 is a broken-out side view of an exemplary embodiment of a toothbrush incorporating the planar oscillation motor, illustrating how the motor is integrated into the toothbrush design.

[0026] Figure 9 is an exploded view of the toothbrush shown in Figure 8, detailing the internal components and their assembly within the toothbrush.

[0027] Figure 10 is a broken-out side view of an exemplary embodiment of a razor that incorporates the planar oscillation motor.

[0028] Figure 11 is an exploded view of the razor depicted in Figure 10, providing a detailed look at how the components fit together and operate within the razor.

[0029] Figure 12 is an exploded view of the planar oscillation motor incorporated in the razor shown in Figure 10.

[0030] Figure 13 is a side view of an exemplary embodiment of a planar oscillation motor with variations in design.

[0031] Figure 14 is an exploded view of the planar oscillation motor shown in Figure 13, detailing the differences in component design and assembly from the embodiments of Figure 1 and Figure 5.

[0032] DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] The terminology used herein aims to describe embodiments and is not intended to limit the scope. The singular forms "a," "an," and "the" may include plural references unless the context explicitly states otherwise. The terms "comprises," "comprising," "including," and "having" indicate inclusion of stated features or components and do not exclude others. The order of method steps and processes described does not imply a necessary sequence unless specified, and alternative or additional steps may be incorporated.

[0034] References to elements being "connected," "engaged," or "coupled" to others can include direct connections or the presence of intermediate elements. That is, it is within the scope of the disclosure that each of these terms include both a direct connection and an indirect connection, with intermediate elements included. The term "directly" preceding any of these terms implies no intervening elements. The term "and / or" covers combinations of one or more of the associated listed items.

[0035] Numerical descriptors such as "first," "second," "third," etc., are used for identification and differentiation without implying any specific order. Spatial terms like "inner," "outer," "left," "right," etc., are used to describe positions relative to other components as shown in figures but can vary with different orientations of the device during use.

[0036] The term "approximately" allows for a variance of +10% from the stated value, acknowledging precision levels that are reasonable within the field of expertise.

[0037] Information and references included in this section are for illustrative purposes only and should not be seen as limiting the scope of the claims. This description does not cover every possible embodiment as it would be impractical; instead, it encompasses permissible variations, deletions, and substitutions as understood by those skilled in the art.

[0038] Each drawing and its elements are consistently referenced throughout the description unless specified otherwise. This disclosure, along with the accompanying drawings, provides a comprehensive understanding of the embodiments, conveying the scope of the invention to those skilled in the art.

[0039] The information included in this section, data, or specifications, including any references cited herein and any description or discussion thereof, is included for exemplary purpose only and is not to be regarded as subject matter by which the scope of the invention as defined in the claims appended hereto is to be bound.

[0040] Figure 1 illustrates an exemplary embodiment of a planar oscillation motor 02 according to the present invention. This motor 02 can produce planar oscillatory motion via a shaft 112.

[0041] Referencing Figure 2, the detailed exemplary embodiment of the planar oscillation motor 02 from Figure 1 includes a stator assembly 100 with a first stator 102, a second stator 104, an armature 106, a position sensor 180, longitudinally arranged elastic links 108a / 108b, three sets of stator supports HOa / l lOb, 134a / 134b, 136a / 136b, and a shaft 112 featuring an anti-rotation surface 112a and an anti-slip notch 112b. The stator supports 110a / l 10b, 134a / 134b, 136a / 136b, may be supporting structures configured to separate the first stator 102 and second stator 104 against their magnetic attraction. These supports, along with positioning cuts 138a / l 38b and 140a / 140b, as well as first and second pairs of middle cuts 130a / 130b, 132a / 132b, form a positioning mechanism to secure the first stator 102 and second stator 104 together against the magnetic force between them. In some embodiments, methods such as welding or adhesive bonding may be employed to enhance the security of the first stator 102 and the second stator 104.

[0042] The first stator 102 and the second stator 104 are substantially flat, elongated, and spaced in a manner so as to extend parallel to one another. The first stator 102 may include a first stator back 114 with a sensor mounting hole 114a where the position sensor 180 is mounted, and a first pair of magnets 118a / l 18b. The second stator 104 may include a second stator back 116 and a second pair of magnets 120a / 120b. Both pairs of magnets, which may be made of any suitable material, for example, NdFeB, are elongate, flat, and magnetized in opposite directions perpendicular to the stator backs 114 and 116. The magnet orientation is displayed in Figure 2. The magnets may be laterally spaced and securely attached to their respective stator backs with an adhesive, such as glue or mechanical fasteners.

[0043] In some embodiments, the stator backs 114 and 116 are cold-formed metal sheets, incorporating a first and second pair of middle cuts 130a / 130b, 132a / 132b, the stator supports 134a / 134b and 136a / 136b, and positioning cuts 138a / l 38b and 140a / 140b.

[0044] Armature 106 includes an armature coil 122, a coil holder 124 to which the shaft 112 is extended or secured, and a bearing 126. A sensor trigger 178 is affixed to the coil holder 124, for example on a side of the coil holder 124 facing the position sensor 180. Both the armature coil 122 and the coil holder 124 may be substantially elongated, flat, and similar in thickness. The armature coil 122, for example an air-core coil, includes two relatively longer sides 128a / 128b, with such longer sides 128a / 128b being parallel to the shaft 112. The elastic links 108a / 108b may be curved, slender metal objects, producible by stamping or other cold forming methods. The stator supports 110a / l 10b can be made of metal or plastic. Shaft 112, made of metal or non-metal materials, is secured to the coil holder 124 by fasteners (mechanical or otherwise), insert molding, or injection molding. The armature coil 122 may be made of self-adhesive magnet wire with rectangular cross-sections. The coil holder 124, made of metal like aluminum or non-metal materials such as plastic or carbon fibers, may be formed by plastic injection molding, with the armature coil 122 securely and firmly attached.

[0045] The elasticity of the elastic links 108a / 108b may be due to material and structure. The elastic links 108a / 108b can be crafted from metal materials such as stainless steel and copper alloys, or non-metal materials such as polymers (PU, POM) and rubber, possibly reinforced with fibers. On structural factors, both curvature and deflection of a slender object may influence the elasticity. The elasticity of the elastic links 108a / 108b may be determined by factors such as the holding force to the armature 106, the oscillation amplitude, and the working frequency. The elastic links 108a / 108b's elasticity may consistently drive the armature 106 towards its central plane, potentially aiding in the armature 106's oscillation, specifically a resonant oscillation.

[0046] One exemplary embodiment involves integrating the armature coil 122, shaft 112 with bearing 126, and both elastic 108a / 108b and stator supports 110a / l 10b as inserted parts into the coil holder 124 via plastic molding injection. Here, the elastic links 108a / 108b can be presecured to the stator supports 110a / l 10b by mechanical connections or plastic injection molding. The rigid support 110a features a first set of adapting ends 142a / 142b, while rigid support 110b has a second set 144a / 144b, each fitting with the middle cuts 132a / 132b in geometry.

[0047] With the rigid support 110a pinned in the middle cuts 130a / 132a and rigid support 110b pinned in the middle cuts 130b / l 32b, and with stator supports 134a / 134b and 136a / 136b pinned in the second pair of positioning cuts 140a / 140b and the first pair of positioning cuts 138a / l 38b respectively, the first stator 102 and the second stator 104 are symmetrically positioned around the armature 106. Concurrently, one of the first pair of magnets 118a, one of the second pair of magnets 120a, and one longer side 128a of the armature coil 122 roughly align in the laminar direction, while one of the first pair of magnets 118b, one of the second pair of magnets 120b, and another longer side 128b of the armature coil 122 also roughly align in the laminar direction.

[0048] The first stator 102 and the second stator 104 are coupled to create a specific magnetic field interaction with the armature 106. The magnetic field lines from magnet 118a to magnet 120a will traverse one longer side 128a of the armature coil 122 in one direction, while the magnetic field lines from magnet 118b to magnet 120b intersect the other longer side 128b of the armature coil 122 in the opposite direction. This arrangement may be advantageous for generating the desired electromagnetic forces that facilitate the planar motion of armature 106.

[0049] In some embodiments, the first stator 102 and the second stator 104 are designed to be identical or substantially identical and can be installed symmetrically around the armature coil 122. This symmetry may be beneficial for balancing the forces and ensuring smooth operation of the motor.

[0050] The elastic links 108a / 108b are components that connect the armature 106 to the stator assembly 100, for example directly or at least without the use of a third part, and / or indirectly via a third part as described with respect to Figure 13, later. The described connections may advantageously can facilitate or even enable the armature to frictionlessly move within a defined plane. These elastic links 108a / 108b may be made from metal sheets and are attached to the armature 106 in such a way that their thickness aligns parallel to the magnetic field. This orientation may advantageously aid in maintaining the structural integrity and responsiveness of the movement mechanism.

[0051] In an exemplary embodiment, as shown in Figures 1 and 2, the elastic links 108a / 108b are secured directly to the side walls 116a / l 16b of the stator backs 114 / 116. In Figure 3, these connections are further detailed, showing that the supports are affixed to the side walls via four rivets 176, providing a robust and reliable mechanical connection.

[0052] For sensing the tilt of the armature 106 relative to the stator backs 114 / 116, a position sensor 180 is employed. This sensor can be a Hall sensor, capacitive sensor, or inductive sensor, depending on the specific requirements of the application. The choice of sensor type influences the design of the sensor trigger 178, which can be made from materials such as magnet, metal, or plastic, each suitable for different types of sensors and triggering mechanisms.

[0053] The assembly process of the planar oscillation motor 02, as outlined in Figure 1, can be achieved through the following detailed steps:

[0054] Step 1 : Install the Stators

[0055] • Secure the first pair of magnets 118a / l 18b to the first stator back 114.

[0056] • Attach the second pair of magnets 120a / 120b to the second stator back 116. This can be done after, simultaneously with, or before attaching the first pair of magnets

[0057] 118a / l 18b to the first stator back 114.

[0058] • These securing steps can advantageously allow for the magnetic components to be properly positioned to create the required magnetic fields for the operation of the motor.

[0059] Step 2: Install the Armature

[0060] • After the stators are installed, the install the bearing 126 onto the shaft 112. • Secure the elastic links 108a / 108b to the stator supports 110a / l 10b by inserted molding or mechanical fasteners.

[0061] • Complete the assembly of the armature 106 by combining the shaft 112 along with bearing 126, the armature coil 122, and the elastic links 108a / 108b with the coil holder 124 through a process of plastic molding injection. During this process, that the sensor trigger 178 can either be mounted onto the coil holder 124 or extruded from it, depending on the design requirements.

[0062] Step 3 : Assemble the Planar Oscillation Motor

[0063] • After the armature is installed, place the armature 106 onto the first stator 102. In this configuration, the stator supports 110a / l 10b can be fit into the first pair of middle cuts 130a / 130b. The first set of adapting ends 142a / 142b of the stator supports can be fit into the first pair of middle cuts 130a / 130b.

[0064] • Position the second stator 104 over the armature 106 and affix the second stator back 116 to both the first stator back 114 and the stator supports 110a / l 10b. In this configuration, the stator supports 134a / 134b can be fit into the second pair of positioning cuts 140a / 140b, and the stator supports 136a / 136b can be fit into the first pair of positioning cuts 138a / l 38b.

[0065] • The second set of adapting ends 144a / 144b of the stator supports 110a / l 10b can be fit into the second pair of middle cuts 132a / 132b to prevent lateral movement of the stator supports 110a / 110b.

[0066] • Mount the position sensor 180 onto the first stator back 114 over the sensor mounting hole 114a. This sensor may be functionally coupled with the sensor trigger 178 to allow for detection and control of the armature's tilt.

[0067] While the steps 1-3 above are described sequentially, with substeps also in sequence, the method of which being within the scope of this disclosure, it can be understood by one skilled in the art that the steps may be performed in any reasonable order in order to achieve the desired planar oscillation motor 02.

[0068] The operation process of the planar oscillation motor 02, as described, involves several mechanisms and components that interact to produce the desired motion. An example of the operation of the planar oscillation motor 02 is as follows:

[0069] 1. Energizing the Armature Coil : • When the armature coil 122 is energized, electric current flows through its longer sides 128a / 128b. Given the arrangement of the magnets in the stators (first stator 102 and second stator 104), these currents intersect the magnetic field lines.

[0070] • According to the Lorentz force law, a force perpendicular to the direction of the current and the magnetic field (transversal force) is exerted on the armature 106. This force causes the shaft 112 to move within the constraints imposed by the elastic links 108a / 108b.

[0071] 2. Oscillation of the Shaft

[0072] • By applying bidirectional current pulses or bi-polarity PWM (Pulse Width Modulation) driving signals, the armature 106 is made to oscillate. This oscillation occurs on a plane defined by the elastic links 108a / 108b, which are designed to allow such movement while controlling the motion path.

[0073] 3. Tilt and Movement Control :

[0074] • The armature 106 can tilt relative to a reference plane perpendicular to the magnetic field due to the flexibility of the elastic links 108a / 108b. This tilt is illustrated in Figure 4.

[0075] • The bearing 126 assists in facilitating this frictionless planar motion, such as 100% frictionless or near 100% frictionless planar motion and / or oscillation by restricting excessive tilt of the armature 106. In some applications, such as electric razors, the bearing may be omitted, for example if tilt control is not critical or otherwise if the bearing is not desired. In this case, such embodiments will utilize the elastic links 108a / 108b to provide the necessary movement control.

[0076] • In other applications, like electric toothbrushes, or any application where controlling the amplitude of tilt is important, the bearing 126 may be included. The bearing 126 limits the tilt by potentially contacting either the first stator back 114 or the second stator back 116, depending on the direction and extent of the tilt.

[0077] • Further, the process may include monitoring and measuring changes in the tilt; activating power to the motor when the tilt exceeds a preset value; and deactivating power to the motor when the tilt falls below the preset value. This may specifically include incrementally increasing motor power with time upon the tilt exceeding the preset value, and gradually decreasing power until cessation when tilt falls below the preset value. The monitoring and measuring the changes in tilt may be done in real time or near real-time, so as to iteratively change the power as changes in tilt occur or a preset threshold reached.

[0078] • In the current configuration, bearing 126 is a rotary ball bearing designed to limit tilt and facilitate frictionless planar motion. It may be positioned between two parallel surfaces — provided directly or indirectly by stator backs 114 / 116 or equivalent structures affixed to stator assembly 100. The outer diameter of bearing 126 may be smaller than the distance between these surfaces. As depicted in Figure 4, bearing 126 may be constrained by the surface of stator back 114 at touching point 182.

[0079] • The rotary bearing 126 is particularly advantageous as, for example, other bearings such as a linear bearing would facilitate frictionless planar motion of the armature 106 while significantly restricting tilt, making it challenging to measure transversal force using position sensor 180. Thus, the described configuration may advantageously facilitate frictionless planar motion of the armature while still allowing for measurement of variation in tilt using the position sensor 180.

[0080] 4. Sensing and Control Mechanism:

[0081] • The position sensor 180 is used to measure the tilt or detect forces applied to the shaft 112, for example by measuring a tilt of the armature relative to the stator assembly or a plane perpendicular to the magnetic field direction due to an external force applied to the shaft. This sensor can generate signals that reflect these parameters.

[0082] • For many applications, continuous monitoring of tilt or force is unnecessary or otherwise not utilized. Instead, a pulse or a step signal from the position sensor 180 can suffice. For example, a capacitive sensor may output a high- or low-level voltage signal when the tilt exceeds a preset threshold.

[0083] • The motor 02 can be programmed to start upon detecting a pulse or the leading edge of a step signal and to stop after a preset time or upon detecting another signal. This operation process highlights the unique design and functionality of the planar oscillation motor 02, which allows for precise control of movement and force application in various consumer and industrial applications. The integration of sensors and flexible supports enables adaptable, efficient, and controlled motor operations suitable for a wide range of uses. In a specific embodiment of the planar oscillation motor 02, the second stator 104 may omit the second pair of magnets 120a / 120b.

[0084] Figure 5 illustrates an exemplary embodiment of the planar oscillation motor 02, capable of providing planar oscillation motion via shaft 112. Detailed in Figures 6 and 7, this embodiment includes a first stator 102, a second stator 104, an armature 106, vertically disposed elastic links 109a / 109b, stator supports HOa / l lOb, 134a / 134b, 136a / 136b, and shaft 112 featuring an engaging ball 112c, with a bearing 126 mounted at the armature's tail.

[0085] The first stator 102 features a first stator back 114 with a first pair middle cuts 130a / 130b and a first coil 150 with a first pair of longer sides 154a / 154b parallel to the axis of the shaft 112. Similarly, the second stator 104 features second stator back 116 with a second pair of middle cuts 132a / 132b and a second coil 152 with a second pair of longer sides 156a / 156b parallel to the axis of the shaft 112. Both the first stator back 114 and the second stator back 116 may be flat, elongated, and can be made of magnetic soft material, for example with metal sheet of low-carbon steel or ferritic stainless steel. The first coil 150 and the second coil 152, also flat, elongate, are firmly attached to their respective stator backs. In some embodiments, the first stator 102 and the second stator 104 are identical or nearly identical in dimensions and functions, and are symmetrically placed about the middle plane of the armature 106.

[0086] Armature 106 includes a pair of armature magnets 146a / 146b, a magnet holder 148, and a shaft 112 affixed to the magnet holder. The armature magnets 146a / 146b, crafted from Nd-Fe-B or similar materials, are permanent magnets. Magnet holder 148, which can be made from metal or plastic via injection molding, holds the armature magnets. Both the magnets and the holder are elongated, flat objects of similar thickness.

[0087] The armature magnets 146a / 146b are attached to the magnet holder 148 using any one or combination of various methods: gluing, mechanical fasteners, or as insert parts in the magnet holder's plastic injection molding. Additionally, each armature magnet (146a or 146b) may include two identical laminates held together by magnetic force and attached to the magnet holder. As depicted in Figure 6, the magnetic poles of the armature magnets 146a / 146b are oppositely oriented.

[0088] Shaft 112, featuring an engaging ball 112c, is constructed from metal and either secured to the magnet holder or directly extends from it. Elastic links 109a / 109b may be u- shaped metal pieces, stamped from metal sheets. Stator supports 110a / l 10b are made from either metal or plastic, similar to as described in Figure 1. As in the Figure 1 embodiment, the stator supports 110a / l 10b may correspond to stator supports, and the elastic links 109a / 109b may correspond to elastic links. In some examples, the elastic links 109a / 109b may have a lower hardness (measured by a Shore hardness or other scale) than the stator supports HOa / l lOb.

[0089] In the described assembly, the stator supports advantageously allow for maintaining the structural integrity and alignment of the components within the planar oscillation motor. For example, the following configuration may apply:

[0090] • Rigid support 110a can be positioned within the middle cuts 130a of the first stator and 132a of the second stator.

[0091] • Rigid support 110b can be similarly pinned within the middle cuts 130b of the first stator and 132b of the second stator.

[0092] This arrangement helps to advantageously stabilize and secure the positioning of the stators relative to the armature. Additionally, stator supports 134a / 134b are pinned in the second pair of positioning cuts 140a / 140b, respectively; stator supports 136a / 136b are pinned in the first pair of positioning cuts 138a / l 38b, respectively.

[0093] This precise placement of supports may advantageously ensure that the first stator 102 and the second stator 104 are symmetrically disposed around the armature 106, contributing to the balanced operation of the motor.

[0094] Furthermore, the alignment of the coils and magnets can allow for optimal magnetic interaction, for example by:

[0095] • One of the longer sides of the first coil (154a) and one of the longer sides of the second coil (156a) align medially with the armature magnet 146b.

[0096] • Similarly, the other longer side of the first coil (154b) and the other longer side of the second coil (156b) align medially with the armature magnet 146a.

[0097] This medial overlap of the coils and magnets can allow for efficient magnetic force generation and transmission, facilitating the intended oscillatory motion of the armature within the motor structure. This arrangement may ensure that the motor operates efficiently and with the intended mechanical precision.

[0098] In a variation from the embodiment shown in Figure 1, two vertically disposed elastic links, 109a and 109b, are positioned at the front of the armature 106. These supports may be beneficial for maintaining the alignment of the armature and facilitating its frictionless planar motion. At the rear of the armature 106, a bearing 126 is mounted to further aid this motion.

[0099] As depicted in Figure 7, the u-shaped elastic links 109a / 109b are attached at one end to the magnet holder 148 and at the other end to the first stator back 114. The connection to the magnet holder 148 can be achieved through methods such as injection molding or using mechanical fasteners, while attachment to the first stator back 114 can be secured by spot welding.

[0100] The assembly process for the planar oscillation motor 02, as depicted in Figure 5, involves the following steps:

[0101] Step 1 : Assemble the Stators

[0102] Securely attach the first coil 150 to the first stator back 114 and the second coil 152 to the second stator back 116 using adhesive. This completes the assembly of the first stator 102 and the second stator 104.

[0103] Step 2: Build the Armature

[0104] Construct the armature 106 primarily through plastic injection molding. Insert the elastic links 109a / 109b and the shaft 112 into the mold before the injection process. Secure the armature magnets 146a / 146b to the magnet holder 148 using adhesive. Attach the bearing 126 to the magnet holder 148 using a fastener, welding, or as an insert part during the injection molding process. The shaft 112, including the engaging ball 112c, may also be formed as an extrusion from the magnet holder 148 during the molding.

[0105] Step 3 : Assemble the Planar Oscillation Motor

[0106] Place the assembled armature 106 onto the first stator 102. Affix the free ends of elastic links 109a / 109b to the first stator back 114 using spot welding. Install the stator supports 110a / l 10b into the corresponding first pair of middle cuts 130a / 130b. Position the second stator 104 over the armature 106, ensuring that all stator supports 110a / l 10b, 134a / 134b, and 136a / 136b fit into their respective middle cuts 132a / 132b, positioning cuts 138a / 138b, and 140a / 140b.

[0107] While the steps 1-3 above are described sequentially, with substeps also in sequence, the method of which being within the scope of this disclosure, it can be understood by one skilled in the art that the steps may be performed in any reasonable order in order to achieve the desired planar oscillation motor 02.

[0108] This structured approach may allow for accurate and efficient assembly of the motor, promoting optimal performance and reliability.

[0109] The operational process for the planar oscillation motor 02, as detailed in Figure 5, is outlined as follows:

[0110] Operation of Planar Oscillation Motor 02:

[0111] • Energizing the Coils:

[0112] The first coil 150 and the second coil 152 are energized using a bipolar pulsive voltage or Pulse Width Modulation (PWM). This creates magnetic fields that pass through the first and second coils in opposite directions.

[0113] • Oscillation Mechanism:

[0114] When both coils are simultaneously energized with the bipolar pulsive voltage, the resulting electromagnetic force causes the armature 106 to oscillate along the plane defined by the elastic links 109a / 109b along with the bearing 126.

[0115] • Frequency and Amplitude Control:

[0116] The motor can operate at a specific resonant frequency to achieve higher amplitude oscillations or at an off-resonant frequency for lower amplitude. The resonant frequency can be adjusted by altering the total mass of the armature 106 or modifying the stiffness of the elastic links 109a / 109b.

[0117] This method allows for precise control over the motor's oscillatory motion, enabling it to be tailored for specific applications requiring variable motion amplitudes and frequencies.

[0118] Figure 8 illustrates an exemplary embodiment of a toothbrush 04, designed according to the present application. This toothbrush features a brush handle 158 and a detachable brush tip 160, which connects to the shaft 112 of a planar oscillation motor 02 housed within the brush handle 158. The brush tip 160 can perform planar oscillation movements. The included planar oscillator motor 02 may be that of the Figure 1 configuration, that of the Figure 5 configuration, or any combination thereof.

[0119] Detailed in Figure 9, the toothbrush 04 includes several components:

[0120] • Brush Handle 158: This may be used to encase the planar oscillation motor 02, and includes a handle housing 162, a motor driver 164, a battery 166, and a holding frame 168. • Seals: The anterior seal 172 and the posterior seal 174 may advantageously ensure watertight integrity. The anterior seal 172, featuring a seal housing end 172a and a seal shaft end 172b, adapts to the handle housing 162 and the shaft 112 respectively, ensuring a watertight connection. The posterior seal 174 typically functions as an Ciring.

[0121] • Inner Space 170: Defined by the handle housing 162 along with the anterior and posterior seals, this space accommodates the battery 166, motor driver 164, and the planar oscillation motor 02. The shaft 112 of the motor extends outside the inner space 170 through the anterior seal 172.

[0122] This configuration may advantageously allow for the toothbrush to be both functional and watertight, suitable for everyday use while enabling the brush tip 160 to execute effective planar oscillation movements for improved cleaning efficacy.

[0123] Handle housing 162 may be a hollow object with a full open bottom 162a and a partially open top 162b, which can be made of plastics, metal, or ceramic. Anterior seal 172 and posterior seal 174 can be made of rubber or flexible plastics. Holding frame 168 includes a motor chamber 190 and a battery chamber 192 for accommodating planar oscillation motor 02 and battery 166 respectively. Holding frame 168 can be made with plastic injection molding. Both handle housing 162 and holding frame 168 are substantially cylindrical and fitting each other in dimensions that holding frame 168 can be inserted into the inner space 170 and secured to the handle housing 162 by mechanical fastener such as snap press-fitting mechanism or welding of laser or ultrasonic.

[0124] The depiction of the planar oscillation motor 02 of the toothbrush 04 can be referred to the exemplary embodiment of the planar oscillation motor 02 of Figure 1. Brush tip 160 comprises a head body 184 and tufts of bristle 186 firmly attached to head body 184. Brush tip 160 may be made of plastics made with injection molding, though another suitable material may be used. Head body 184 comprises a shaft receiver 188 fitting in anti -rotation surface 112a and anti-slip notch 112b geometrically, with which brush tip 160 will be unable to spin freely and easily detached from shaft 112.

[0125] Motor driver 164 comprises a printed circuit board (PCB) 194, a microcontroller unit (MCU) 196, a sensor chip 198, and a position sensor 180. Position sensor 180 can be a capacitive sensor, inductive sensor, or hall sensor. Position sensor 180 is a capacitive sensor in this exemplary embodiment, which includes a moving pad 200, a static pad 202 and an insulative layer 201. Both moving pad 200 and static pad 202 are conductive, and insulative layer 201 is incorporated into a capacitor. Moving pad 200 is made of deformable material such as metal sheet material. Either moving pad 200 or static pad 202 (or both) can be grounded. Sensor trigger 178 may deform moving pad 200 when a force applied tufts of bristle 186 is large enough, thereby the capacitance of the position sensor 180 will change. The change in capacitance will be detected by sensor chip 198, which will send out a signal to MCU 196 in terms of its internal algorithm. The signal may represent the force applied to tufts of bristle 186 or the tilt of shaft 112 relative to axis of brush handle 158 exceeds a threshold E.

[0126] The assembly of the exemplary embodiment of the toothbrush 04 of Figure 8 can be described as follows.

[0127] Step 1 :

[0128] Place planar oscillation motor 02 into motor chamber 190, and battery 166 into battery chamber 192; then fix motor driver 164 to holding frame 168; and then place anterior seal 172 and posterior seal 174 onto holding frame 168.

[0129] Step 2:

[0130] Insert assembled holding frame 168 into inner space 170 from full open bottom 162a, which will be stopped by the partially open top 162b with seal housing end 172a remaining inside handle housing 162 and seal shaft end 172b reaching out of inner space 170 from partially open top 162b. The assembled holding frame 168 can then be held firmly by handle housing 162 with a snap press-fitting mechanism, or welding, or adhesive.

[0131] Step 3 :

[0132] Attach the brush tip 160 onto / the shaft 112 by pushing it onto brush handle 158, thereafter the assembly of the embodiment of the toothbrush 04 is accomplished. While the steps 1-3 above are described sequentially, with substeps also in sequence, the method of which being within the scope of this disclosure, it can be understood by one skilled in the art that the steps may be performed in any reasonable order in order to achieve the desired planar oscillation motor 02. An operation process of the exemplary embodiment of the toothbrush 04 stated above can be described as follows.

[0133] Once brush tip 160 pushes teeth with tufts of bristles 186, sensor trigger 178 leaves away from moving pad 200. Consequently, the capacitance of the position sensor 180 increases suddenly and will send out a continuous signal, for instance the high-level voltage, to MCU 196, which will activate planar oscillation motor 02 for working. Then the tips of tufts of bristles 186 move along the surfaces of the teeth driven by the planar power to clean the teeth. The position sensor will interrupt the signal sending, for instance sending out a low-level voltage, to MCU 196, which will deactivate the planar oscillation motor 02. However, to get a better user experience, the start and stop may not be immediately realized once MCU 196 receives signals from the position sensor 180, in which the start or stop may be delayed, or in a an incremental or decremental manner of power, for instance PWM, controlled in terms of a control procedure.

[0134] In the exemplary embodiment of the toothbrush 04 as depicted in Figures 8 and 9, the toothbrush is designed to feature a switchless operation and allows for planar motion of the brush tip. This design not only advantageously enhances user convenience but also contributes to the inherent waterproofing of the device, making it highly suitable for the wet environment of oral hygiene routines.

[0135] Further advantages of the toothbrush as described herein may be as follows:

[0136] 1. Switchless Operation:

[0137] The toothbrush 04 operates without a traditional mechanical power switch. Instead, it utilizes a position sensor 180, integrated with the control logic of (MCU) 196. This setup allows the toothbrush to activate or deactivate based on specific positional cues, such as when the brush tip 160 touches teeth or leaves teeth.

[0138] 2. Planar Motion of the Brush Tip:

[0139] The planar oscillation motor 02 enables the brush tip 160 to move in a plane, providing effective cleaning through a back-and-forth motion that is different from typical rotational movements seen in many electric toothbrushes.

[0140] 3. Waterproof Design:

[0141] Because of lacking a mechanical switch, there is no third leakage passage besides the two sealed ends of the handle housing 162. In addition, the switchless feature facilitates using metal material for making the handle housing 162.

[0142] 4. Additional Functionalities Configured by MCU and Sensors:

[0143] Force Detection: The system can detect the amount of force applied during brushing. This is beneficial for supplying brushing power on demands.

[0144] Mitigation of irritation: transition from one side of the mouth to the other in brushing may result in irritation to teeth. With the configuration by the position sensor 180 and the MCU 196 control logic, the irritation can be reduced by adjusting power during the transition.

[0145] 5. Alternative to Switchless Operation:

[0146] Although one described design is switchless, an alternative method using a tactile switch is also possible. This could be implemented for users who prefer a physical interaction to power on / off the device, and may provide advantages to such users.

[0147] The exemplary embodiment of the planar oscillation motor 02, as depicted in Figures 5 and 6, can also serve as a replacement for the motor inside toothbrush 04.

[0148] Figure 10 illustrates an exemplary embodiment of a razor 06 according to the present invention. This razor 06 includes a planar oscillation motor 02 and a blade cartridge 204 that detachably connects to the motor through a shaft 112 featuring an engaging ball 112c. The included planar oscillator motor 02 may be that of the Figure 1 configuration, that of the Figure 5 configuration, or any combination thereof.

[0149] Referencing Figure 11, the detailed structure of the razor 06 from Figure 10 is shown. The razor comprises the planar oscillation motor 02, a trimmer housing 206, a control unit 208, a trimmer battery 210, and a holder 212.

[0150] The trimmer housing 206 features a housing body 214, a switch button 216, a top cap 218 equipped with a rotation guide surface 220 and a holding slot 222, and a housing seal 224. The housing body 214 is an elongated, thin-walled object with a top opening 230 and a switch opening 232. The top cap 218 may be hollow. Both the housing body 214 and the top cap 218 can be manufactured from metal or plastic using injection molding techniques. The switch button 216, which can be made from rubber or soft plastic, is securely fitted across the switch opening 232 to ensure a watertight seal. The housing seal 224 consists of a body seal 226 and a shaft seal 228, both of which may be crafted from rubber or soft plastics.

[0151] The holder 212 is a thin-walled component also producible via plastic injection molding, designed to snugly fit within the hollow space of the housing body 214. It accommodates the planar oscillation motor 02 in a motor room 234, mounts the control unit 208 against a front wall 236, and secures the trimmer battery 210 on the other side of the front wall.

[0152] The blade cartridge 204 includes a static toothed blade 238 equipped with two rows of symmetrically arranged static teeth 240 on each edge, and a dynamic toothed blade 242 featuring two rows of symmetrically arranged dynamic teeth 244 on each edge.

[0153] Additional components include an attaching magnet 246, an attaching piece 248, a cartridge holder 250, a joint adaptor 258, and a static blade fastener 260 may be included. The cartridge holder 250 comprises two identical cartridge legs 252, each with a slide surface 254 and an elastic member 256.

[0154] The static and dynamic toothed blades 238, 242 may be thin planar objects with two long and parallel sides, with at least one side featuring teeth. The static blade can be securely attached to the blade cartridge 204, while the dynamic blade 238 may be constrained onto the static blade 242, allowing free movement parallel to the longer sides. Both blades 238, 242 have teeth that may be similar in number, shape, and position, aligning one by one. The teeth on both the static and dynamic toothed blades 238, 242 can take the form of various shapes, including spikes, triangles, or squares.

[0155] The static toothed blade 238, dynamic toothed blade 242, attaching piece 248, a spheric adaptor 262 made from a U-shaped metal piece, and the static blade fastener 260 may be included and may be constructed from metal sheet through cold forming. The cartridge legs 252 may be crafted from metal sheet and finished along with the static blade fastener 260 or made from plastics and secured to the static blade fastener 260, thereby forming the cartridge holder 250. The attaching magnet 246 may be affixed to the static toothed blade 238 using welding or riveting, secured by the static blade fastener 260. The attaching piece 248, made from a soft magnetic material such as SUS430, is attached to the dynamic toothed blade 242 also by welding or riveting. The joint adaptor 258 is similarly secured to the attaching piece 248.

[0156] The dynamic toothed blade 242 connects to the blade cartridge 204 through magnetic forces between the attaching magnet 246 and the attaching piece 248, allowing the dynamic teeth 244 to align closely and slide freely over the static teeth 240. To reduce friction during sliding, a PVD coating may be applied to either or both the static toothed blade 238 and the dynamic toothed blade 242.

[0157] Both the slide surface 254 of the cartridge legs 252 and the rotation guide surface 220 of the top cap 218 are cylindrical and share identical features, being co-centered with the spheric adaptor 262. The spheric adaptor 262 itself features a pair of spherical crowns, ideally aligned centrally with both the rotation guide surface 220 and the slide surface 254.

[0158] As depicted in Figure 12, the planar oscillation motor 02 of razor 06 includes a stator assembly 100, which consists of a first stator 102 with a first stator back 114 and a first coil 150, and a second stator 104 with a second stator back 116 and a second coil 152. The armature 106 features armature magnets 146a / 146b secured to a magnet holder 148, with two oppositely positioned armature magnets and a shaft 112 that includes an engaging ball 112c. Notably, the bearing 126 is omitted in this exemplary embodiment, like the planar oscillation motor 02 shown in Figure 5. The elastic links 108a / 108b are as depicted in the embodiment from Figure 1.

[0159] The control unit 208 comprises a control unit PCB 268, a control MCU 266, and a tactile switch 264 located around the switch button 216.

[0160] The assembly process for the exemplary embodiment of razor 06 from Figure 10 is outlined as follows

[0161] Step 1 : Secure the planar oscillation motor 02 into the motor room 234 of the holder 212. Step 2: Install the control unit 208 and the trimmer battery 210 onto the front wall 236 and other side of the back wall 236 of the holder 212, respectively.

[0162] Step 3 : Fit the housing seal 224 at the front of the planar oscillation motor 02, ensuring the shaft 112 penetrates the shaft seal 228, which wraps around the shaft in a watertight manner. Step 4: Insert the holder 212, with all attached components, into the housing body 214 through the top opening 230 until fully seated.

[0163] Step 5: Position the top cap 218 onto the housing body 214 to enclose the trimmer housing 206 securely, ensuring a watertight seal and forming the trimmer handle.

[0164] Step 6: Attach the blade cartridge 204 to the trimmer handle. This involves:

[0165] Engaging the engaging ball 112c with the spheric adaptor 262 so that the joint adaptor 258 can apply elastic force for gripping the engaging ball 112c, allowing it to fit geometrically and move freely within the spheric adaptor 262.

[0166] Ensuring the rotation guide surface 220 aligns with and can freely rotate about the slide surface 254 around the engaging ball 112c.

[0167] Inserting the elastic member 256 into the holding slot 222 to restrict the free rotation of the blade cartridge 204 about the engaging ball 112c using the elastic force between the elastic member 256 and the holding slot 222.

[0168] Optionally, both the rotation guide surface 220 and the slide surface 254 are spherical surfaces that fit together and are co-centered with the engaging ball 112c, allowing the blade cartridge 204 to rotate with two degrees of freedom.

[0169] While the steps 1-6 above are described sequentially, with substeps also in sequence, the method of which being within the scope of this disclosure, it can be understood by one skilled in the art that the steps may be performed in any reasonable order in order to achieve the desired planar oscillation motor 02. The operation procedure for the razor 06 as described involves a simple yet effective mechanism for hair cutting, driven by the interaction between various components of the device.

[0170] Below are some operational steps and advantages from the described configuration:

[0171] 1. Activation: The user presses the switch button 216. This action triggers the tactile switch 264, which in turn signals the control MCU 266.

[0172] 2. Motor Operation: Upon receiving the signal from the tactile switch 264, the control MCU 266 activates the planar oscillation motor 02. This motor may advantageously convert electrical energy into mechanical oscillations.

[0173] 3. Oscillation Transmission: The shaft 112, which includes the engaging ball 112c, begins to oscillate. This oscillation may advantageously directly influence the movement of the attached components.

[0174] 4. Blade Movement: The oscillation of the shaft 112 and the engaging ball 112c is transmitted through the joint adaptor 258 to the dynamic toothed blade 242. This causes the dynamic toothed blade 242 to oscillate relative to the static toothed blade 238.

[0175] 5. Cutting Action: As the dynamic toothed blade 242 oscillates, it moves back and forth relative to the static toothed blade 238. This relative motion between the two sets of teeth (dynamic and static) shears hairs that enter the teeth, effectively cutting them.

[0176] The detailed description provided aims to ensure clarity and understanding of the operational mechanics without imposing unnecessary limitations on the scope of the invention. The intention is to allow for modifications and adaptations by those skilled in the art, acknowledging that such changes may arise from the basic principles described here without departing from the spirit and scope of the invention as outlined in the appended claims.

[0177] Thus, the invention is not confined to the specific embodiments presented but is open to modifications that fall within the intended scope of the claims, encouraging innovation and adaptation to meet various needs.

[0178] Figures 13 and 14 illustrate an exemplary embodiment of the planar oscillation motor 02, capable of providing planar oscillation motion via shaft 112. Detailed in Figures 14, this embodiment includes a first stator 102, a second stator 104, an armature 106, an elastic link 108, stator supports 110c / l lOd, and shaft 112 with a bearing 126 co-axially positioned, a vertical bearing 126a mounted at the armature's tail, a third part 272 with two hitching pins 272a and two link passage 272b secured to the second stator 106. The embodied planar oscillation motor 02 is designed to be capable of withstanding a transversal load F.

[0179] The first stator 102 may include a first stator back 114 and a first pair of magnets 118a / l 18b secured to the first stator back 114 in parallel, side by side, with opposite polarity directions. Similarly, the second stator 104 comprises a second stator back 116 and a second pair of magnets 120a / 120b secured to it in the same manner. Both stator backs are flat, elongated, and made of magnetic soft material. Stator supports 110c / l lOd may extend from the stator backs 114 / 116 through metal sheet folding. Pin slots 280a / 280b on the stator backs 114 / 116 fit with the stator supports 110c / l lOd, aligning the stators and magnets in parallel. These structures maintain a balance of magnetic force between the stators 102 / 104, creating a parallel magnetic field. The stator assembly 100 described here can be cross-referenced with the embodiment in Figure 1.

[0180] The armature 106 comprises an armature coil 122 and a coil holder 124 where the shaft 112 is extended or secured. Both the armature coil 122 and the coil holder 124 are elongated, flat, and of similar thickness. The armature coil 122 is, for example, an air-core coil. The coil holder 124 features a bearing housing 286 with a housing cap 278 to accommodate the vertical bearing 126a, a bearing shaft 274, and a bearing stop 276. The bearing shaft 274 passes through the coil holder 124 and the vertical bearing 126a, which can be fixed to the stator back 114 / 116 via shaft holes 282a / 282b. These components allow the armature 106 to rotate freely around the bearing shaft 274. The coil holder 124 is typically made of plastic through plastic injection molding, ensuring secure attachment of the armature coil 122 and the shaft 112. The elastic link 108 is a pre-shaped belt-like component with two hanging ears 284, typically made of materials like metal sheet, rubber, plastics, carbon fiber, or other fiber- reinforced materials. It attaches to the third part 272 by inserting the hanging ears 284 into the hitching pins 272a through the link passage 272b. When the bearing 126 exerts force, the elastic link 108 deforms to restrict the bearing's movement away from an oscillation plane perpendicular to the magnetic field. Simultaneously, it may apply a lateral force towards the armature's central plane, aiding in smooth or frictionless oscillation. The third part 272, which can be metallic or non-metallic, is secured to the second stator back 116 using methods like mechanical fastening, welding, or adhesive bonding. Thus, in some configurations, the elastic link 108 will connect the armature 106 to the stator assembly including first stator 102 and second stator 104 via the third part 272, while in others, for example some embodiments disclosed previously, the elastic links 108 will connect the armature 106 to the stator assembly directly (either without the third part 272 entirely, or via a route not connected through the third part 272).

[0181] The assembly process for the planar oscillation motor 02, as depicted in Figure 13, can be achieved via the following steps:

[0182] Step 1 : Install the Stators

[0183] • Secure the first pair of magnets 118a / l 18b to the first stator back 114.

[0184] • Attach the second pair of magnets 120a / 120b to the second stator back 116. Step 2: affix the third part 272 onto the second stator back 116.

[0185] Step 3 : Install the Armature

[0186] • Install the bearing 126 onto the shaft 112.

[0187] • Combine the shaft 112 along with bearing 126, and the armature coil 122, with the coil holder 124 through a process of plastic molding injection.

[0188] • Complete the installation of the armature 106 by placing the vertical bearing 126a along with the bearing shaft 274, bearing stop 276, the housing cap 278 into the coil holder 124.

[0189] Step 3 : Assemble the Planar Oscillation Motor

[0190] • After the armature is installed, place the armature 106 onto the second stator 104. In this configuration, the bearing shaft 274 fits into the shaft hole 282b. Secure the elastic link 108 to third part 272 with the bearing 126 confined by the elastic link 108. • Position the first stator 102 over the armature 106 and affix the first stator back 114 to both the second stator back 116 by fitting the stator supports 110c / l lOd into the pin slot 280a / 280b respectively. The first stator 102 and the second stator 104 can thus have secured each other by means of the magnetic force between them and the stator supports HOc / l lOd together.

[0191] While the steps 1-3 outlined above are presented in a sequential manner, with substeps also following a sequence, it should be noted that these steps can be executed in any logical order by individuals skilled in the relevant field to achieve the desired functionality of the planar oscillation motor 02.

[0192] The operational procedure of the planar oscillation motor 02 closely resembles that of the embodiment depicted in Figure 1, except for the segment concerning the position sensor 180. An example illustrating the operation of the planar oscillation motor 02 is provided below:

[0193] 1. Energizing the Armature Coil :

[0194] • When the armature coil 122 is energized, electric current flows through its longer sides 128a / 128b. Given the arrangement of the magnets in the stators (first stator 102 and second stator 104), these currents intersect the magnetic field lines.

[0195] • According to the Lorentz force law, a force perpendicular to the direction of the current and the magnetic field (transversal force) is exerted on the armature 106. This force prompts the shaft 112 to move within the limitations set by the elastic link 108.

[0196] 2. Oscillation of the Shaft

[0197] • By utilizing bidirectional current pulses or bi-polarity Pulse Width Modulation (PWM) driving signals, the armature 106 is induced to oscillate. This oscillation takes place on a plane largely perpendicular to the parallel magnetic field, with the elasticity of the elastic link 108 aiding in enhancing the oscillation, particularly at resonant frequencies. The movement of shaft 112, in this scenario, involves a planar scan centered around the bearing shaft 274 within a specific sectorial region.

[0198] In a scenario where the elastic link is extremely flexible, the bearing 126 would follow an elliptical trajectory with a slight tilt oscillation along with the planar oscillation. It is possible for the planar oscillation to function even without the bearing 126, as long as shaft 112 is securely attached to the elastic link 108 at a suitable location, such as through welding. This setup allows for the oscillation to occur effectively, demonstrating the flexibility and adaptability of the planar oscillation motor design.

[0199] 3. Start and stop control: • To regulate the initiation and cessation of the planar oscillation motor 02, a position sensor can be incorporated if necessary, following a similar approach to that seen in the embodiment of Figure 1.

Claims

CLAIMSWe claim:

1. A planar oscillation motor comprising: an armature comprising a body and a shaft attached to the body; a stator assembly comprising a first stator, a second stator, and stator supports, wherein the first stator and the second stator are separated by the stator supports defining a space for unrestricted movement of the armature body within a parallel magnetic field generated between the first stator and the second stator; and one or more elastic links that connect the armature to the stator assembly either (a) directly or (b) indirectly through a third part, in such a manner to facilitate frictionless oscillation of the armature on a plane substantially perpendicular to the magnetic field.

2. The planar oscillation motor of claim 1, wherein the armature further comprises one or more bearings facilitating the frictionless oscillation by restricting a tilt of the armature relative to said plane perpendicular to the magnetic field direction.

3. The planar oscillation motor of claim 1, wherein the elastic links are connected to the stator assembly via one or more of the stator supports.

4. The planar oscillation motor of claim 1, wherein the armature further comprises a coil, and the stator assembly includes one or more permanent magnets, with the first and second stators coupled to align magnetic field lines to be parallel to each other as the magnetic field lines intersect the coil.

5. The planar oscillation motor of claim 1, wherein the armature further comprises one or more permanent magnets, and the stator assembly further comprises one or more coils, with the stators and the armature positioned such that magnetic field lines are parallel to each other as they cross the coils.

6. The planar oscillation motor of claim 1, further comprising a sensor configured to measure a tilt of the armature relative to its plane of motion due to an external force applied to the shaft.

7. A toothbrush comprising:the planar oscillation motor of claim 1; a motor driver; and a brush tip detachably engaged with the planar oscillation motor, wherein the motor is configured to provide planar motion to the brush tip.

8. The toothbrush of claim 7, wherein the armature includes bearings limiting armature’s tilt relative to its plane of motion due to an external force applied to the brush tip.

9. The toothbrush of claim 7, further including a driver incorporating a position sensor for measuring a tilt of the armature relative to the stator assembly.

10. A razor compri sing : the planar oscillation motor of claim 1; and a cutting implement in cooperative engagement with the motor, the cutting implement comprising a blade cartridge with a static toothed blade and a dynamic toothed blade detachably engaging with the motor.

11. A control method for a handheld appliance featuring a planar oscillation motor with an armature having a shaft and a sensor designed to measure tilt due to an external force, the method comprising: monitoring and measuring changes in the tilt; activating power to the motor when the tilt exceeds a preset value; and deactivating power to the motor when the tilt falls below the preset value.

12. The control method of claim 11, further comprising incrementally increasing motor power with time upon the tilt exceeding the preset value, and gradually decreasing power until cessation when tilt falls below the preset value.

13. The control method of claim 11, further including adjusting the power supplied to the motor in accordance with the preset value.

14. The control method of claim 11, wherein the monitoring and measuring the changes in the tilt is performed in real time.

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