Patent Publication Number: US-2021184553-A1

Title: Vibrating actuator

Description:
FIELD OF THE INVENTION 
     The present invention is directed to a novel vibrating actuator for a variety of applications, for example, a miniature vibro-tactile actuator having multiple resonant frequencies. More specifically, the novel vibrating actuator provides high-definition haptic output for immersive experiences for video, gaming and music and other immersive experiences. 
     BACKGROUND OF THE INVENTION 
     The majority of music we traditionally listen to can be regarded as complex signals resulting from the addition of several signals, e.g. mixed music signals of multiple instruments or voices. The same is also true for audio signals associated with gaming or video content, where not only mixed music signals can be present, but also other complex signals such as sound effects and additional voices. With the possibility of electronically recording and reproducing sound, in particular complex music or audio associated with gaming or video signals, a further aspect becomes important, namely the conversion of electrical signals to sound waves which are perceived by the listener when the sound is reproduced. In order to reduce distortion problems during reproduction, U.S. Pat. No. 3,118,022 discloses an electroacoustic transducer comprising two conductive members, a diaphragm which includes electrets and conductive materials and which is supported between the two conductive members, and a mechanism for electrically connecting to said diaphragm and the two conductive members. 
     On the other hand, the coupled perception of sound and vibration is a well-known phenomenon. Sound is a mechanical wave that propagates through compressible media such as gas (air-borne sound) or solids (structure-borne sound), wherein the acoustic energy is transported via vibrating molecules and received by the vibrating hair cells in the listener&#39;s cochlea. Vibration, on the other hand, is a mechanical stimulus which excites small or large parts of the perceiver&#39;s body through a contact surface. The coupled perception of sound and vibration is based on the fact that the human brain receives sound not only through the ears, but also through the skeleton—measurements in a concert hall or church confirm the existence of whole-body vibrations. The body perception of low frequencies is particularly important for an immersive experience of live music, any music sensation that is desired to be pleasurable or audio associated with video games, or movies. 
     Accordingly, high-definition haptic feedback could be used to create immersive experiences for video, gaming and music and other immersive experiences where the vibration is coupled to continuous audible (or visual) signals. Major requirements for a device to achieve continuous high-definition haptic feedback are: 
     1. large frequency range, ideally from 20 to 1000 Hz, to be able to generate good quality vibrations over this range, in particular, for music; 
     2. heavy moving mass, for effective acceleration; 
     3. small, especially flat, size to make the device portable or wearable; 
     4. high power efficiency to enable uninterrupted use; 
     5. silent vibration to avoid disturbance of the sound experience; 
     6. steady performance to enable continuous use; 
     7. cost efficient manufacturing to provide an affordable device. 
     Vibrotactile voice-coil or moving magnet-type actuators are normally used in industrial applications and use a voice coil or moving magnet-type actuator consisting of two parts, one of which is moving and one of which is stationary, wherein the two parts are interconnected by an elastic attachment. The vibration is generated by the interaction of a movable permanent magnet and a stationary coil surrounding it, wherein, due to the Laplace Force, an alternating current passing through the coil interacts with the magnetic field of the magnet and generates a mechanical force with changing direction on the magnet—this results in a linear movement of the magnet with changing direction, causing the vibration. However, standard linear resonant actuators only have a very narrow frequency range which makes them unsuitable for many uses including enhanced sound experience. 
     EP 0580117A2 discloses such a moving magnet-type actuator for industrial use in control equipment, electronic equipment, machine tools and the like. In order to improve the performance of the actuator, the stationary part comprises at least three coils and the moving part comprises at least two permanent magnets arranged with same poles facing each other such that the magnetic flux is used more effectively because a highly concentrated magnetic field is created in the plane between the magnets. The elastic attachment interconnecting the magnets and the coils consists in compression springs. However, the magnetic field lines, once they have crossed the surrounding coils, are lost and not guided back to the magnets which results in waste of potential magnetic field. Furthermore, like all industrial vibrators, this actuator is noisy which makes it unsuitable for many uses including enhanced sound experience and, in particular, music. 
     US 20110266892 discloses a vibration generation device for producing vibration frequencies. The vibration generation device comprises a first vibrator and a second vibrator. The first vibrator is formed by a pair of magnets and a coil, which are placed in a first elastic support members to produce the first vibration. The second vibrator is capable of freely vibrating in the magnetic field formed by the magnets and the magnetic field generated by the coil. The second vibrator has another elastic member for supporting the vibration of the second vibrator. However, the assembly of the first vibrator is contained within the second vibrator and the first elastic member operates within the assembly of the other elastic member thereby restricting the vibration of the first vibrator. 
     US 20180278137 discloses a vibrating motor with a housing, a stator, a vibrator and an elastic support member. The vibrator includes a mass block and magnets. The stator includes a first coil with a first fixing board and a second coil with a second fixing board. The first and second coils are located on opposite sides of the mass block. The linear vibrating motor reduces loss of the magnetic field, which makes it more efficient, while implementing vibration feedback. However, the linear vibrating motor only operates at one resonant frequency. 
     WO 2018079251 discloses another type of vibrating motor that requires less space and provides good responsiveness. The linear vibrating motor includes a mover with weights, which are affixed on the longitudinal end side of a pair of long magnets. A coil fixed to a base has a long shape in the longitudinal direction of the pair of magnets. When an electric current is passed through the coil, it drives and reciprocates the mover in the transverse direction to generate vibration. However, the vibrating motor only operates at one resonant frequency. 
     There is still a need for a vibrating actuator that is efficient at producing a high definition haptic output for enhanced wide band frequency response. Additionally, this vibrating actuator can overcome the deficiencies of the prior art to create immersive haptic experiences for audio associated with video, gaming and music by satisfying the requirements mentioned above. 
     SUMMARY OF THE INVENTION 
     A vibrating actuator having two different resonant frequencies is disclosed. The vibrating actuator comprises a chassis  110 , a first moving part  210  and a second moving part  220 . The first moving part  210  has an arrangement of magnets  320  and a frame  310 . The arrangement of magnets  320  has a pair of outer poles  328 . The second moving part  220  includes two U-shaped brackets  420  and at least one coil  410 . The at least one coil  410  is wound over the arrangement of magnets  320  such that the first moving part  210  slides into the second moving part  220 . The chassis  110  comprises two parts  170 ; each of the two parts  170  of the chassis  110  is cut to form a first elastic member  150  and a second elastic member  160 . The first moving part  210  is attached to the first elastic member  150  and the second moving part  220  is attached to the second elastic member  160  such that each of the outer poles  328  of the arrangement of magnets  320  faces the first elastic member  150  and the second elastic member  160  of each of the two parts  170  of the chassis  110 . In addition, the two parts  170  of the chassis  110  are disposed diagonally opposite to each other such that the first elastic member  150  and the second elastic member  160  point in the opposite direction. The two parts  170  of the chassis  110  mate with each other to form a rectangular parallelepiped structure. 
     In one embodiment, each of the two parts  170  of the chassis  110  is U-shaped. Alternatively, each of the two parts  170  of the chassis  110  is L-shaped. In another embodiment, the chassis  110  is formed by one part, which is U-shaped or O-shaped. When each of the two parts  170  of the chassis  110  is U-shaped, the two parts  170  of the chassis  110  includes an upper plate  120 , a lower plate  130 , and a lateral plate  140 . The lateral plate  140  has the first elastic member  150  and the second elastic member  160  cut from the lateral plate  140  on each of the two parts  170  of the chassis  110 . 
     The first elastic member  150  and the second elastic member  160  are U-shaped and are arranged on each of the two parts  170  of the chassis  110  such that the second elastic member  160  surrounds the first elastic member  150  on three sides and the first elastic member  150  and the second elastic member  160  terminate into the lateral plate  140  on the fourth side. The first elastic member  150  on each of the two parts  170  of the chassis  110  is formed by a rectangular plate  704  and two legs  702 . The two legs  702  have transversal indentations either on an inner edge  716  and/or an outer edge  718  or on both the inner edge  716  and the outer edge  718 . Alternatively, either one or both the inner edge  716  and/or the outer edge  718  has straight edges. Similarly, the second elastic member  160  on each of the two parts  170  of the chassis  110  is formed by a rectangular plate  708  and two legs  706 . The two legs  706  have transversal indentations either on an inner edge  720  and/or an outer edge  722  or on both the inner edge  720  and the outer edge  722 . Alternatively, either one or both the inner edge  720  or the outer edge  722  has straight edges. 
     In one variation, the rectangular plate  708  of the second elastic member  160  is affixed to a L-shaped part  1204  to form a holder  1202 . The holder  1202  has a provision to secure the second moving part  220  comprising one or more coils  410 . 
     In one embodiment, the first moving part  210  includes the arrangement of magnets  320  having at least two magnets, a first magnet  322  and a second magnet  324 . In an alternate implementation, the first moving part  210  includes the arrangement of magnets  320  having at least two magnets, the first magnet  322  and the second magnet  324  with a spacer  502  placed in between the first magnet  322  and the second magnet  324 . 
     In another embodiment, the first moving part  210  includes the arrangement of magnets  320  having three magnets, the first magnet  322 , the second magnet  324 , and a third magnet  326 . In an alternate implementation, the first moving part  210  includes the arrangement of magnets  320  having three magnets, the first magnet  322 , the second magnet  324 , and the third magnet  326  with the spacer  502  provided in between the two adjacent magnets, wherein the like poles of the two adjacent magnets face each other. 
     In embodiments, the spacer  502  can be a non-magnetic material or a paramagnetic material. 
     In one embodiment, the first moving part  210  includes a frame. The arrangement of magnets  320  is held together with a glue and placed within the frame  310 . In another embodiment, the arrangement of magnets  320  is held together with the glue without the frame  310 . In another embodiment, the arrangement of magnets  320  has the spacer  502  placed in between the adjacent magnets, wherein the spacer and the magnets are held together with the glue without the frame  310 . 
     In one embodiment, only one coil  412  is provided. In another embodiment, a first coil  412  and a second coil  414  are provided. In yet another embodiment, the at least one coil  410  comprises more than two coils. 
     In one embodiment, the second moving part  220  includes U-shaped brackets  420  and the at least one coil  410 . In another embodiment, the second moving part  220  includes only at least one coil  410  without U-shaped brackets  420 . 
     In an embodiment, the upper plate  120  and the lower plate  130  of the chassis  110  have attachment means  904  for attaching guiding magnets  902 . The attachment means  904  are tabs. In another embodiment, the attachment means  904  are clamps, clips or holding brackets. 
     In an embodiment where the arrangement of magnets comprises two magnets  322 ,  324 , a pair of guiding magnets  902  are provided. The guiding magnets  902  are placed on opposite sides and affixed with attachment means  904  such that the transversal center line of each of the guiding magnets  902  is longitudinally aligned with the transversal center line of the spacer  502  placed in between the arrangement of magnets  320 . 
     In an embodiment, when the arrangement of magnets  320  has the spacer  502  provided in between adjacent magnets, the guiding magnets  902  are placed on each of the upper plate  120  and the lower plate  130  on opposite sides on each of the two parts  170  and affixed with attachment means  904  such that the transversal center line of the guiding magnets  902  is longitudinally aligned with the transversal center line of the spacer  502  placed in between the arrangement of magnets  320 . 
     In another embodiment, when the arrangement of magnets  320  does not include the spacer  502  between adjacent magnets, the guiding magnets  902  are placed on each of the upper plate  120  and the lower plate  130  on the opposite sides on each of the two parts  170  and affixed with the attachment means  904  such that the transversal center line of the guiding magnets  902  is longitudinally aligned with the transversal intersection line of the first magnet  322  and the second magnet  324  of the arrangement of magnets  320 . 
     Alternatively in another embodiment, the guiding magnets  902  are placed on each of the upper plate  120  and the lower plate  130  on the opposite sides on each of the two parts  170  and affixed with the attachment means  904  such that the transversal center line of the guiding magnets  902  is longitudinally offset by 0.2 mm to 1 mm from the transversal center line of the spacer  502  or the transversal intersection line of the first magnet  322  and the second magnet  324  of the arrangement of magnets  320 . 
     In another embodiment, where the arrangement of magnets  320  comprises more than two magnets, more pairs of guiding magnets  902  are provided such that, if the arrangement of magnets  320  comprises n magnets, n−1 pairs of guiding magnets  902  are provided. 
     In one embodiment, the arrangement of magnets  320  and the at least one coil  410  are aligned such that the transversal intersection line of the two adjacent magnets longitudinally coincides with the longitudinal center of the at least one coil  410 . In an alternate embodiment, the arrangement of magnets  320  and the at least one coil  410  are aligned such that the transversal intersection line of the two adjacent magnets is longitudinally offset by 0.25 mm to 2 mm from the longitudinal center of the at least one coil  410 . In one implementation, when the arrangement of magnets  320  includes the first magnet  322  and the second magnet  324 , the transversal intersection line longitudinally coincides with the longitudinal center of the coil  412 . Alternatively, in another implementation of the embodiment, when the arrangement of magnets  320  includes the first magnet  322  and the second magnet  324 , the transversal intersection line of the adjacent magnets is longitudinally offset by 0.25 mm to 2 mm from the longitudinal center of the coil  412 . 
     A method for manufacturing a vibrating actuator is disclosed. The method of manufacturing includes assembling a first moving part  210  having an arrangement of magnets  320  comprising at least two magnets, that is, the first magnet  322  and the second magnet  324  with like poles of the adjacent magnets facing each other. The arrangement of magnets  320  has two outer poles  328 , which face towards the first elastic member  150  and the second elastic member  160 . Further, the method of manufacturing includes a second moving part  220  having the at least one coil  410  such that the at least one coil  410  is wound over the arrangement of magnets  320 . In one embodiment, when there are only two magnets in the arrangement of magnets  320 , there is only one coil  412 . In another embodiment, when there are only two magnets in the arrangement of magnets  320  and there is only one coil  412 , the arrangement of magnets  320  has the spacer  502  in between the adjacent magnets. In another embodiment, there are only two magnets in the arrangement of magnets  320  with the spacer  502  provided in between the adjacent magnets and one coil  412 , then a pair of guiding magnets  902  are provided for directing the magnetic field lines of the arrangement of magnets  320 . A chassis  110  is formed by two parts  170 . Each of the two parts  170  of the chassis  110  is cut to form a first elastic member  150  and a second elastic member  160 . The two parts  170  of the chassis  110  are arranged such that the first elastic member  150  and the second elastic member  160  of each of the two parts  170  of the chassis point in the opposite direction and the first elastic member  150  and the second elastic member  160  face one of the two outer poles  328  of the arrangement of magnets  320 . Each first elastic member  150  of each of the two parts  170  is attached to the first moving part  210  and each second elastic member  160  of each of the two parts  170  is attached to the second moving part  220 . The two parts  170  of the chassis  110  are assembled to form a rectangular parallelepiped structure of the vibrating actuator. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
         FIG. 1  illustrates an isometric view of a vibrating actuator; 
         FIG. 2  illustrates an exploded isometric view of the vibrating actuator with a first moving part, a second moving part, and a chassis; 
         FIG. 2A-2C  illustrate different variations of the chassis; 
         FIG. 3  illustrates the first moving part of the vibrating actuator; 
         FIG. 4  illustrates the second moving part of the vibrating actuator; 
         FIG. 4A  illustrates a variation of the second moving part of the vibrating actuator; 
         FIG. 5A-5C  illustrate different configurations of an arrangement of magnets and coils; 
         FIG. 5D-5F  illustrate different configurations of the arrangement of magnets, with spacers provided between adjacent magnets and coils; 
         FIG. 6  illustrates an isometric view of one of two parts of the chassis having a first elastic member and a second elastic member; 
         FIG. 7 ,  FIG. 7A ,  FIG. 7B  and  FIG. 7C  illustrate different variations of the first elastic member and the second elastic member; 
         FIG. 8  illustrates an isometric view of a vibrating actuator with guiding magnets in another embodiment; 
         FIG. 9  illustrates an exploded isometric view of the vibrating actuator with guiding magnets and attachment means; 
         FIG. 10  illustrates an exploded isometric view showing the first moving part and second moving part of the vibrating actuator with guiding magnets; 
         FIG. 11  illustrates the isometric view of a compact vibrating actuator in yet another embodiment; and 
         FIG. 12  shows an isometric exploded view of the compact vibrating actuator in yet another embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The present invention is directed to a vibrating actuator for providing wideband haptic feedback, although it can be used in a variety of applications that provide vibrotactile feedback. A wide bandwidth in haptic feedback, for example from 40 to 120 Hz, is important as it reproduces the multiple, complex frequencies found in real world environments. Typically, a moving magnet vibrating actuator or a moving coil vibrating actuator only has one resonant frequency, for example 110 Hz. Such a vibrating actuator can have a useful bandwidth of only 100 to 120 Hz. When such a vibrating actuator is utilised to reproduce a range of frequencies outside this 100 to 120 Hz range, for example, 60 to 80 Hz, it provides a poor user experience due to a strong decrease in efficiency away from the tuned resonant frequency of 110 Hz. The decreased efficiency and increased power consumption can degrade the performance of a device in which the actuator is embedded. For example, the battery life in a mobile device is reduced; the quality of vibration significantly drops in medical applications; the overall performance of gaming devices such as headsets, gaming consoles, etc, is degraded. There is a need for a technical solution that will spread the useful, efficient bandwidth of an actuator to be able to match the frequency range of 40 Hz to 120 Hz, similar to the range of the complex frequencies found in real world environments. 
     The above problem with a single frequency vibrating actuator can be solved using a multiple frequency vibrating actuator. In an ideal scenario, a single frequency resonant actuator should be capable of responding equally to a range of frequencies, however, due to the typical distribution of the frequency response curve, the vibrating actuator responds efficiently only at the resonant frequency. Other frequencies around the resonant frequency are damped out considerably. The problem is solved by having a multiple resonant frequency vibrating actuator that responds efficiently to a wide range of frequencies. Due to the technical difficulty of incorporating multiple resonant frequencies in a miniature device, it is advantageous to have at least two resonant frequencies to solve the problem of single resonant frequency actuators. The novel vibrating actuator responds efficiently to both the resonant frequencies, say the first resonant frequency f 1  (60 Hz) and the second resonant frequency f 2  (100 Hz). When the two resonant frequencies are well defined and spread apart to allow a wide bandwidth, for example, 60 Hz to 100 Hz, and are still close enough to allow good response in between the two frequencies, then it will allow good performance across the full wideband frequency range, for example every frequency between 40 and 120 Hz. The innovative vibrating actuator allows a wide range of frequencies to be efficiently produced with optimal current consumption, thus enhancing the performance of the vibrating actuator for wideband applications. 
     Furthermore, when implementing a miniature vibrating actuator in a compact device, such as a mobile phone, tablet, stylus or laptop; the available volume of space is limited compared to other larger devices such as a mouse, keyboard or gamepad. The space constraint in compact devices creates multiple problems. The first problem is, in order to achieve a realistic and strong amount of acceleration during vibration across the frequency range, the moving parts which are either the moving magnets or the moving coils, or both the moving magnets and the moving coils, should have a large mass. As a result of having a larger mass for the magnets and coils, there is less space in the vibrating actuator for additional parts, such as affixing screws or additional subassemblies for holding the magnet and coils. The second problem is, as the actuator size decreases, the tolerances in manufacturing decrease, therefore miniature actuators are difficult to assemble. Additionally, the usage of multiple parts in an assembly of a miniature actuator can contribute to tolerance stackup as the individual tolerances of the parts are accumulated, therefore the performance characteristics of the actuator have a high variance. 
     The novel vibrating actuator overcomes the aforementioned problems by reducing the number of parts required for the assembly by combining multiple sub-assemblies into one integrated part, such as combining the chassis and elastic members into a single integrated structure. Additionally, the size of the magnets can be reduced by introducing a pair of guiding magnets, which direct the magnetic field lines in such a way that the magnetic field lines traverse the coils at an angle, which is orthogonal to the direction of the winding of the coils, with a resulting Lorenz force along a single axis. 
     The novel vibrating actuator can be utilised in all devices and applications which provide haptic feedback such as but not limited to gaming pads, mobile devices such as mobile phones, tablets, medical equipment, automotive systems and other application areas. The innovative vibrating actuator can also be used to enhance the performance of all the haptic devices where the performance and capability of wideband actuators are required, but wherein these devices have been constrained by the use of single frequency actuators such as Linear Resonant Actuators (LRA) or Eccentric Rotating Mass (ERM) actuators. 
     The present invention and its advantages are best understood by referring to the illustrated embodiments shown in the accompanying drawings, in which like numbers designate like parts. The present invention may, however, be embodied in numerous devices for producing haptic output and should not be construed as being limited to the exemplary embodiments set forth herein. Exemplary embodiments are described below to illustrate the present invention by referring to the figures. 
     In this application, the term “longitudinal” means in the linear direction of the movement of the moving parts of the vibrating actuator, which is considered along the X-axis; “transversal” means in a direction in the plane orthogonal to the longitudinal direction, which is considered along the Y-axis; “orthogonal to X-Y-plane” means in the Z-axis, that is orthogonal to both the X-axis and the Y-axis; and “diagonally opposite” means opposite corners of two parallel sides of a square or a rectangle structure. 
     The present invention provides a unique and novel vibrating actuator having two different resonant frequencies. The two different resonant frequencies are produced by a first moving part and a second moving part with each of the first moving part and the second moving part suspended by a pair of elastic members. 
       FIG. 1  and  FIG. 2  illustrate an isometric view and an exploded isometric view of the vibrating actuator  100 . The vibrating actuator  100  includes a first moving part  210 , a second moving part  220  and the chassis  110  apart from other parts. The chassis  110  is formed by two parts  170 . In the preferred implementation, the two parts  170  are U-shaped as shown in  FIG. 2 . However, in another implementation, the chassis  110  can be formed by two parts  250 , which can be L-shaped as illustrated in  FIG. 2A . In another implementation, as illustrated in  FIG. 2B , the chassis  110  is formed by a single part  260 , which is U-shaped. In yet another implementation, the chassis  110  is formed by a single part  270 , which is sealed at one end to form a rectangular parallelepiped structure as illustrated in  FIG. 2C . 
     In the preferred implementation, when the two parts  170  of the chassis  110  are U-shaped, each of the two parts of the chassis  110  is formed by an upper plate  120  and a lower plate  130 . The upper plate  120  and the lower plate  130  are folded orthogonally to form a lateral plate  140 . For example, the upper plate  120  is folded orthogonally to form a lateral plate  140 , which in turn is folded orthogonally to form the lower plate  130  so as to form a U-shaped structure. The upper plate  120  and lower plate  130  are identical in shape, size and dimension. The two parts  170  are mated together to form a rectangular parallelepiped shaped chassis  110 . The chassis  110  is assembled by mating the parts  170  by welding or gluing such that the top ends of the second elastic members  160  are placed in the opposite direction. For example, one of the two parts  170  is rotated 180 degrees around the axis perpendicular to the X-Y-plane (Z-axis) with respect to the other part to form the rectangular parallelepiped chassis  110 . The lateral plate  140  includes the first elastic member  150  and the second elastic member  160 . 
     Each of the two parts  170  of the chassis  110  includes a first elastic member  150  and a second elastic member  160 . The first elastic member  150  and the second elastic member  160  are fabricated by cutting and folding the lateral plate  140 . The first elastic member  150  is U-shaped, with the two ends of the U-shape terminating into the lateral plate  140 . Likewise, the second elastic member  160  is U-shaped, with the two ends of the U-shape terminating into the lateral plate  140 . Additionally, the second elastic member  160  arches over the first elastic member  150  such that the first elastic member  150  and the second elastic member  160  operate independently of each other. 
     The first elastic member  150  is affixed to the first moving part  210  and the second elastic member  160  is affixed to the second moving part  220  on each of the two parts  170  of the chassis  110 . The first elastic member  150  has a slight inward bend, towards the center of the vibrating actuator, with respect to the plane (Y-Z-plane) of the lateral plate  140 , whereas the second elastic member  160  and the lateral plate  140  are in the same plane. 
       FIG. 3  illustrates the different parts of the first moving part  210  and  FIG. 4  illustrates the different parts of the second moving part  220 . The first moving part  210  comprises a frame  310  and an arrangement of magnets  320 . The second moving part  220  comprises U-shaped brackets  420  and at least one coil  410 . 
     The frame  310  is formed by an outer rectangular periphery  302  having a hollow rectangular space  304 . Alternatively, the frame  310  can be formed with an outer square periphery having a hollow rectangular space  304 . Other geometrical shapes are also possible for the outer periphery such as but not limited to parallelogram, trapezoid, etc. In the preferred implementation, the frame  320  is rectangular having an outer rectangular periphery  302 . 
     The frame  310  is constructed by stamping or laser cutting and folding any non-magnetic sheet metal such as stainless steel, aluminum, nickel, copper, brass, zinc or any other non-magnetic material. In another variation, the frame  310  is injection molded out of a polymer such as plastic or can be cast out of any non-magnetic material. When the frame  310  is constructed using plastic or any other polymer, the frame  310  can be printed using a 3D printer for fast assembly. The outer rectangular periphery  302  edges are rounded, chamfered, or filleted to avoid sharp edges, which can accidentally cause damage to either the first elastic member  150  or the second elastic member  160 . The hollow rectangle  304  provided in the frame  310  has rounded corners, which are utilized for securely fitting the arrangement of magnets  320 . Accordingly, the arrangement of magnets  320  also has rounded edges to mate perfectly within the frame  310 . 
     The short sides of the outer rectangular periphery  302  of the frame  310  are along the transversal direction and have provisions for joining the first elastic member  150  of each of the two parts  170  of the chassis  110 . The first elastic members  150  can be affixed to the outer rectangular periphery  302  by either welding, riveting, gluing, with screws, or via folds that mechanically mate to form a strong joint or bond. The first elastic member  150  formed on each of the two parts  170  of the chassis  110  is affixed on the diagonally opposite sides of the outer rectangular periphery  302  of the frame  310 . 
     The arrangement of magnets  320  comprises a first magnet  322 , a second magnet  324  and a third magnet  326  in the present implementation, but in other variations more than or less than three magnets can be arranged inside the frame  310 . Accordingly, the frame  310  can be fabricated to accommodate two or more magnets. All four edges of the first magnet  322 , the second magnet  324 , and the third magnet  326  are rounded to avoid sharp edges; although in some variations the sharp edges can also be eliminated by other known geometries. For example, the edges of the first magnet  322 , the second magnet  324 , and the third magnet  326  can be chamfered edges or fillet edges. In another variation, the first magnet  322 , the second magnet  324 , and the third magnet  326  can all have non-square edges. The polarities of the first magnet  322  and the second magnet  324  are disposed to be symmetrical, that is, the north pole of the first magnet  322  and the north pole of the second magnet  324  face each other. Likewise, the polarity of the second magnet  324  and the third magnet  326  are disposed to be symmetrical, that is, the south pole of the second magnet  324  and the south pole of the third magnet  326  face each other. This configuration creates a strong magnetic field that moves radially outwards from the intersection of the first magnet  322  and the second magnet  324  with like poles facing each other (north pole facing north pole) and radially inwards at the intersection of the second magnet  324  and the third magnet  326  with like poles facing each other (south pole facing south pole). Additionally, the first magnet  322 , the second magnet  324 , and the third magnet  326  are equal in width (shown by W in  FIG. 3 ) but have different lengths in longitudinal direction (along the X-axis). For example, in the present implementation, the width and length of the first magnet  322  and the third magnet  326  is equal, while the second magnet  324  has substantially larger length. In different variations, the first magnet  322 , the second magnet  324 , and the third magnet  326  can all have equal or unequal width and length depending upon the frame  310 . Additionally, the size of each magnet in the arrangement of magnets  320  can be the same or different depending upon the requirements of magnetic field to be generated. 
     The arrangement of magnets  320  with like poles facing each serves to create a high concentration of the magnetic field inside the at least one coil  410 . If the arrangement of magnets  320  comprises three magnets  322 ,  324 ,  326 , two coils  412 ,  414  are provided. In this implementation, the highly concentrated magnetic field generated in the coils  412 ,  414  is due to the magnetic fields generated by the first magnet  322 , the second magnet  324 , and the third magnet  326 . The binding of the first magnet  322 , the second magnet  324 , and the third magnet  326  can be very difficult since the like poles of the magnets repel each other. The frame  310  is designed to securely hold the arrangement of magnets  320 , for example, the first magnet  322 , the second magnet  324 , and the third magnet  326  in the frame  310 . Alternatively, the frame  310  can also be used to securely hold the first magnet  322 , the second magnet  324 , and the third magnet  326  in the frame  310  for initial assembly by gluing and the frame  310  is then removed after the glue has cured and the arrangement of magnets  320  is placed in the coils  410  to create a frameless arrangement of magnets. Furthermore, the frame  310  provides additional mass to the first moving part  210 . By varying the mass of the frame  310  and the arrangement of magnets  320 , different resonant frequencies and vibration strengths can be achieved. 
     When the arrangement of magnets  320  is placed with like poles facing each other inside the frame  310 , the two outer ends of the magnets form the two outer poles  328 . The frame  310  is attached to the first elastic member  150  of each of the two parts  170  of the chassis  110  on diagonally opposite sides such that the outer poles  328  of the arrangement of magnets  320  face each first elastic member  150 . 
     In one alternate variation of this implementation, the first moving part  210  comprises the frame  310 , the arrangement of magnets  320  with a spacer provided in between the magnets. The spacer can be a non-magnetic material or a paramagnetic material that reduces the size of each magnet in the arrangement of magnets  320 , to reduce cost. 
     Referring to  FIG. 4 , the second moving part  220  comprises the at least one coil  410  and the U-shaped brackets  420 . There can be any number of coils, for example, a single coil  412 , however, in this embodiment, there are two coils  410 , i.e., a first coil  412  and a second coil  414  as shown in  FIG. 4 . The number of coils  410  is determined by a simple formula n−1, where n is the number of magnets  320 , except in a special case when n=1 then there is only one magnet  322  and one coil  410 . 
     The coils  410  are constructed by winding an enamelled copper wire around a bobbin, which is long in the transversal direction (Y-axis). Additionally, the length of coils  410  is slightly greater than the length of the frame  310  to allow free movement of the first moving part  210  in the longitudinal direction (X-axis). 
     In the preferred implementation, there are two coils  410  comprising the first coil  412  and the second coil  414  with an equal number of windings and the same dimensions, however, in other variations as shown in  FIG. 5A-5F  there can be different combinations with unequal windings and dimensions of the coils  410 . The first coil  412  and the second coil  414  are connected together such that the first coil  412  is wound in one direction, for example, clockwise and the second coil  414  is wound in the opposite direction, for example, anti-clockwise. In addition, the longitudinal center of the first coil  412  is longitudinally aligned with the transversal intersection line of the first magnet  322  and the second magnet  324  arranged with the north pole facing the north pole of the first magnet  322  and the second magnet  324 . Likewise, the longitudinal center of the second coil  414  is longitudinally aligned with the transversal intersection line of the second magnet  324  and the third magnet  326  arranged with the south pole facing the south pole of the two magnets  324  and  326 . In an alternate implementation, the longitudinal center of the first coil  412  may not longitudinally coincide with the transversal intersection line of the first magnet  322  and the second magnet  324  but is near or around it, that is, off center and non-coinciding. In another implementation, the longitudinal center of the second coil  414  may not longitudinally coincide with the transversal intersection line of the second magnet  324  and the third magnet  326  but is near or around it, that is, off center and non-coinciding. 
     The two ends of the coil  410  terminate into a connector or conductors for providing alternating electric current into the coils  410 . When an alternating electric current passes through the coils  410 , the alternating current interacts with the magnetic field of the magnets  320  to produce a Lorentz force. The Lorentz force is generated in one direction during the first half cycle and in the opposite direction in the second half cycle to produce a vibratory motion in the longitudinal direction (X-axis). 
       FIG. 4  and  FIG. 4A  illustrate the different variations of the second moving part  220  with different types of the U-shaped brackets  420  attached to the coils  410 . The U-shaped brackets  420  comprise the U-shape bracket  420 A and the U-shaped bracket  420 B, which are identical in shape, size, and construction. 
       FIG. 4  shows a pair of U-shaped brackets  420 , in which each of the U-shaped brackets  420  is made of a non-magnetic material and comprises three different sections: a base plate  428  having a protruding element  426  orthogonal to the face of the base plate  428  and two right trapezoid shaped plates  422 , that is, a first right trapezoid shaped plate  422 A and a second right trapezoid shaped plate  422 B. The first right trapezoid shaped plate  422 A and the second right trapezoid shaped plate  422 B are similar in size and dimensions. The first right trapezoid plate  422 A and the second right trapezoid plate  422 B are orientated on either side of the base plate  428 , such that the entire assembly creates a structure that looks like the U-shaped bracket  420 A or the U-shaped bracket  420 B, as shown in  FIG. 4 , with an open face. In the preferred implementation, the open face of the pair of U-shaped brackets  420  extends slightly beyond the frame  310  in the transversal direction (Y-axis). The U-shaped brackets  420  are fabricated by cutting and folding non-magnetic sheet metal. Alternatively, the pair of U-shaped brackets  420  can also be formed by welding the base plate  428  to two separate right trapezoid shaped plates  422 A and  422 B. The U-shaped bracket  420 A is attached to coil  412  and the U-shaped bracket  420 B is attached to coil  414  such that their open faces are diagonally opposite to each other and substantially cover the longitudinal side (X-axis) of the frame  310  as shown in  FIG. 4 . The protruding element  426  is used for welding the second elastic members  160  of the two parts  170  of the chassis  110  with the U-shaped brackets  420 . 
     The first coil  412  and the second coil  414  are joined to each other by glue or bonding material. Furthermore, the first coil  412  is attached to the U-shaped bracket  420 A by glue or bonding material and the second coil  414  is attached to the U-shaped bracket  420 B such as to form a rectangular tubular structure, which moves freely over the first moving part  210 . 
       FIG. 4A  illustrates another variation of the U-shaped brackets  420 . The U-shaped bracket  420 A has a metal strip or a metal rod  450 A that joins the first right trapezoid shaped plate  422 A and the second right trapezoid shaped plate  422 B, such that the metal strip or the metal rod  450 A is parallel to the base plate  428  as shown in  FIG. 4A . The U-shaped bracket  420 B is similar in size and dimension to the U-shaped bracket  420 A. 
       FIG. 5A-5F  show the different arrangements of the magnets  320  and the coils  410  in different variations of the present invention. All these variations can be implemented in the vibration actuator  100  in different embodiments. In all the embodiments, the like poles of the magnets of the arrangement of magnets  320  face each other. 
       FIG. 5A  shows a configuration of an arrangement of magnets  320  comprising the first magnet  322 , the second magnet  324 , and only one coil  412 . The transversal intersection line of the first magnet  322  and the second magnet  324  is longitudinally aligned with the longitudinal center of the coil  412 . In another variation of this implementation, the transversal intersection line of the first magnet  322  and the second magnet  324  and the longitudinal center of the coil  412  are longitudinally offset by a small distance, for example, between 0.25 mm to 2 mm. 
       FIG. 5B  shows the preferred implementation with the arrangement of magnets  320  comprising three magnets, that is, the first magnet  322 , the second magnet  324 , the third magnet  326 , wherein the coils  410  include two coils, that is, the first coil  412  and the second coil  414 . In this embodiment, the longitudinal center of each of the coils  410  is longitudinally aligned with the corresponding transversal intersection line of adjacent magnets of the arrangement of magnets  320 . In another variation of this implementation, the transversal intersection lines of the adjacent magnets and the longitudinal centers of the first coil  412  and the second coil  414  are longitudinally offset by a small distance, for example, between 0.25 mm to 2 mm. 
       FIG. 5C  illustrates the configuration with four magnets and three coils. The arrangement of magnets  320  comprises the first magnet  322 , the second magnet  324 , the third magnet  326  and a fourth magnet  380 . Similarly, the coils  410  include three coils, that is, the first coil  412 , the second coil  414 , and a third coil  480 . In this implementation, the longitudinal center of each of the coils  410  is longitudinally aligned with the corresponding transversal intersection line of adjacent magnets. For example, the longitudinal center of the first coil  412  is longitudinally aligned with the transversal intersection line of the first magnet  322  and the second magnet  324 , the longitudinal center of the second coil  414  is longitudinally aligned with the transversal intersection line of the second magnet  324  and the third magnet  326  and the longitudinal center of the third coil  480  is longitudinally aligned with the transversal intersection line of the third magnet  326  and the fourth magnet  380 . In another variation of this implementation, the centers of the coils are longitudinally offset by a small distance, for example, between 0.25 mm to 2 mm with respect to the transversal lines of intersection of adjacent magnets. 
       FIG. 5D  shows the arrangement of magnets  320  comprising the first magnet  322  and the second magnet  324  with a spacer  502  provided in between the first magnet  322  and the second magnet  324  and the coil  412 . In addition, the coil  412  is wound around the arrangement of magnets  320  such that the spacer  502  is longitudinally aligned with the longitudinal center of the coil  412 . As described earlier, the spacer  502  is a non-magnetic material or a paramagnetic material that reduces the size of each magnet in the arrangement of magnets  320  to reduce cost. In another variation of this implementation, the spacer  502  and the longitudinal center of the coil  412  are longitudinally offset by a small distance, for example, between 0.25 mm to 2 mm. 
       FIG. 5E  shows the arrangement of magnets  320  comprising three magnets, that is, the first magnet  322 , the second magnet  324 , and the third magnet  326  and the coils  410 . The spacer  502  is provided in between the adjacent magnets of the arrangement of magnets  320 . For example, the spacer  502  is provided between the first magnet  322  and the second magnet  324 . Similarly, the spacer  502  is provided between the second magnet  324  and the third magnet  326 . In addition, the coils  410  include the first coil  412  and the second coil  414 . The longitudinal center of the first coil  412  is longitudinally aligned with the longitudinal center of the spacer  502  provided between the first magnet  322  and the second magnet  324 . Likewise, the longitudinal center of the second coil  414  is longitudinally aligned with the longitudinal center of the spacer  502  provided between the second magnet  324  and the third magnet  326 . Alternatively, the longitudinal center of the first coil  412  can be longitudinally offset from the longitudinal center of the spacer  502  provided between the first magnet  322  and the second magnet  324  and the longitudinal center of the second coil  414  can be longitudinally offset from the longitudinal center of the spacer  502  provided between the second magnet  324  and the third magnet  326 . In this implementation, the offset is between 0.25 mm to 2 mm. 
       FIG. 5F  shows the arrangement of magnets  320  comprising two pairs of two magnets and two coils  410 . The first pair of magnets includes the first magnet  322  and the second magnet  324 . The second pair of magnets includes the third magnet  326  and the fourth magnet  380 . The spacer  502  is provided in between the first pair of magnets and the second pair of magnets. The coils  410  comprise the first coil  412  and the second coil  414 . The first coil  412  is wound around the first pair of magnets such that the longitudinal center of the first coil  412  is longitudinally aligned with the transversal intersection line of the first magnet  322  and the second magnet  324 . The second coil  414  is wound around the second pair of magnets such that the longitudinal center of the second coil  414  is longitudinally aligned with the transversal intersection line of the third magnet  326  and the fourth magnet  380 . In another variation of this implementation, the longitudinal center of the first coil  412  and the transversal intersection line of the first magnet  322  and the second magnet  324  and the longitudinal center of the second coil  414  and the transversal intersection line of the third magnet  326  and the fourth magnet  380  are longitudinally offset by a small distance, for example, between 0.25 mm to 2 mm. 
       FIG. 6  illustrates one of the two parts  170  of the chassis  110 . Each of the two parts  170  of the chassis  110  includes the first elastic member  150  and the second elastic member  160 , which are U-shaped. The first elastic member  150  and the second elastic member  160  are fabricated by cutting and stamping the lateral plate  140 . The first elastic member  150  is slightly bent inwards, towards the center of the vibrating actuator, with respect to the plane (Y-Z-plane) of the lateral plate  140 , and has a flat plate at the base for attaching with the first moving part  210 . Furthermore, the second elastic member  160  is aligned with the plane (Y-Z-plane) of the lateral plate  140 . 
       FIG. 7 ,  FIG. 7A , and  FIG. 7B  illustrate different variations of the first elastic member  150  and the second elastic member  160 . 
       FIG. 7  illustrates the preferred embodiment of the first elastic member  150  and the second elastic member  160 . 
     The first elastic member  150  is U-shaped having two parallel thin strips, which form two legs  702  and a base in the form of a rectangular plate  704 . The rectangular plate  704  is separated by a small distance and is parallel to the plane (Y-Z-plane) of the lateral plate  140 . The two legs  702 , which join the rectangular plate  704  and the lateral plate  140  are inclined at an angle as shown in  FIG. 6 . The rectangular plate  704  of the first elastic member  150  of each of the two parts  170  of the chassis  110  is utilised for affixing the first elastic member  150  to the frame  310  of the first moving part  210 . In another variation, where the frame  310  has only been used to secure the magnets of the arrangement of magnets  320  during gluing and then removed, each rectangular plate  704  of each of the first elastic member  150  of the two parts  170  of the chassis  110  is attached to one of the two outer poles  328  of the arrangement of magnets  320 . The two legs  702  of the first elastic member  150  have transversal indentations along their inner edges  716 , while their outer edges  718  are straight as shown in  FIG. 7 . In an alternate implementation as shown in  FIG. 7A , the two legs  702  of the first elastic member  150  have transversal indentations on their outer edge  718 , while their inner edge  716  is straight. In yet another alternative implementation as shown in  FIG. 7B , the first elastic member  150  has transversal indentations on both the inner edge  716  and the outer edge  718  of the two legs  702 . 
     The second elastic member  160  is also U-shaped having two parallel thin strips, which form two legs  706 , and a base, which is a rectangular plate  708 . The rectangular plate  708  and the lateral plate  140  are in the same plane (Y-Z-plane). Additionally, the second elastic member  160  has transversal indentions on the inner edge  720  of the two legs  706 , while the outer edge  722  of the two legs  702  is straight as shown in  FIG. 7 . In another variation of this implementation, the second elastic member  160  has transversal indentations on the outer edge  722  of the two legs  706 , while the inner edge  720  of the two legs  702  is straight  718  as shown in  FIG. 7A . In yet another variation, the two legs  706  of the second elastic member  160  have transversal indentations on both their inner edge  720  and their outer edge  722  as shown in  FIG. 7B . The rectangular plate  708  is used for attaching the second elastic member  160  to the second moving part  220 . 
     Each of the two parts  170  of the chassis  110  needs to be of a material that has good elastic properties allowing the first elastic member  150  and second elastic member  160  to flex and displace during vibration, while being rigid enough to keep the structural stability of the assembly. Examples of materials can be: copper beryllium, spring steel, titanium, Kevlar® or ABS plastic. 
     The first elastic member  150  is surrounded by the second elastic member  160  on three sides, while the fourth side of the first elastic member  150  and the second elastic member terminate into the lateral plate  140 . The first elastic member  150  and the second elastic member  160  are separated from each other with a narrow gap. The separation allows the first elastic member  150  and the second elastic member  160  to vibrate independently of each other. Furthermore, the lateral plate  140  extends parallel to the two legs  706  of the second elastic member  160  up to the edge of the upper plate  120  and the lower plate  130  on both sides of the second elastic member  160  and is oriented such that there exists a narrow gap between the lateral plate  140  and the second elastic member  160 . 
     In yet another alternative implementation as illustrated in  FIG. 7C , the first elastic member  150  comprises a rectangular strip  710  with symmetrical transversal indentations on both outer edges  724  on the long sides of the rectangle and a rectangular plate  712 . The rectangular strip  710  terminates into the lateral plate  140  at one end and the rectangular plate  712  at the other. The upper section of the first elastic member  150 , which is a rectangular plate  712 , is used for affixing the first elastic member  150  to the frame  310  of the first moving part  210 . The second elastic member  160  is also U-shaped as described above. The two legs  706  of the U-shape of the second elastic member  160  terminate into the lateral plate  140  and have transversal indentations on their inner edge  720  and their outer edge  722  as shown in  FIG. 7C . In another implementation, the second elastic member  160  has transversal indentions on the inner edge  720  of the two legs  706 , while the outer edge  722  of the two legs  706  is straight as shown in  FIG. 7 . In another variation of this implementation, the second elastic member  160  has transversal indentations on the outer edge  722  of the two legs  706 , while the inner edge  722  of the two legs  702  is straight  718  as shown in  FIG. 7A . In an alternate implementation, the inner edge  720  and the outer edge  722  of two legs  706  of the second elastic member  160  are straight and parallel to each other. 
     The indentations on the first elastic member  150  and the second elastic member  160  serve to uniformly distribute the stress across the first elastic member  150  and second elastic member  160 , when displaced during vibration. For example, if the two legs  702  of the first elastic member  150  are without indentations, but rather are rectangular strips with two straight inner edges and outer faces, the stress would be concentrated towards the ends of the two legs  702 , where the two legs  702  connect with the lateral plate  140  and the rectangular plate  704 . Likewise, if the two legs  706  of the second elastic member  160  are without indentations, but rather are rectangular strips with straight inner and outer faces, the stress would be concentrated towards the ends of the legs  706 , where the two legs  706  connect with the lateral plate  140  and the rectangular plate  708 . Over many cycles of vibration, this concentration would fatigue the area around the ends of the legs ( 702 ,  706 ) and a microscopic crack would be formed, which then over time would become larger and lead to a complete fracture. By reducing the amount of material towards the middle of the two legs ( 702 ,  706 ) through indentations, a larger area of the two legs ( 702 ,  706 ) will deform during vibration and the stress becomes evenly distributed across the length of the two legs ( 702 ,  706 ) and the likelihood of a failure will be reduced. 
     Each of the two parts  170  of the chassis  110  is fabricated out of a highly flexible and yet rigid material that protects the vibrating actuator from structural deformation during operation and yet provides high elasticity such that the first moving part  210  and the second moving part  220  can be displaced and produce vibratory force. Examples of materials can be: copper beryllium, spring steel, titanium, Kevlar® or ABS plastic. 
       FIG. 8  illustrates an assembled isometric view of the vibrating actuator with a spacer and guiding magnets in another embodiment of the invention.  FIG. 9  illustrates a partial exploded isometric view of vibrating actuator  900  and  FIG. 10  illustrates the exploded view of the vibrating actuator  900  showing the first moving part  210  and the second moving part  220 . 
     The vibrating actuator  900  includes the first moving part  210 , which comprises the frame  310  and the arrangement of magnets  320 . The arrangement of magnets  320  is formed by the first magnet  322  and the second magnet  324  with the spacer  502  provided in between the adjacent magnets of the arrangement of magnets  320 . In an alternate implementation, the arrangement of magnets  320  is formed by the first magnet  322  and the second magnet  324  without the spacer  502  provided, as shown in  FIG. 5A . The first magnet  322  and the second magnet  324  are arranged with like poles facing each other. Further, the second moving part  220  comprises the at least one coil  410  and the U-shaped brackets  420 , which includes the U-shaped bracket  420 A and the U-shaped bracket  420 B. In this embodiment, only one coil, that is, the coil  412  is utilised in the second moving part  220 . However, in other variations, the coils  410  can be formed by the first coil  412  and the second coil  414 , which are wound in opposite directions. Different variations of the arrangement of magnets  320  and the coils  410  can be implemented in this embodiment as shown in  FIG. 5A  to  FIG. 5F . Furthermore, the vibrating actuator  900  includes the  110  chassis formed by two parts  170 . 
     As in the embodiments described above, the chassis  110  is formed by two parts  170 , which are U-shaped. However, in other variations the chassis  110  can be formed by either one part or two parts. For example, the chassis  110  can be formed with one part, which can either be the U-shaped part as shown in  FIG. 2B  or the closed rectangular parallelepiped structure sealed at one end as shown in  FIG. 2C  and as described earlier. Likewise, the chassis  110  can be formed with two parts  170  that are L-shaped as shown in  FIG. 2A . 
     Each of the two parts  170  of chassis  110  includes the upper plate  120 , the lower plate  130  and the lateral plate  140 . The upper plate  120  has one or more attachment means  904  for securing a pair of guiding magnets  902 . The attachment means  904  are provided directly opposite to each other on the upper plate  120  and the lower plate  130  of each of the two parts  170  of the chassis  110 . The attachment means  904  are provided near and parallel to the ends of the upper plate  120  and the lower plate  130 , that is the ends which are opposite from the lateral plate  140  on each of the two parts  170  of the chassis  110 . In this embodiment, a first pair of attachment means  904  are provided at the end of the upper plate  120  and another pair of attachment means  904  are provided at the end of the lower plate  130  to secure each of the guiding magnets  902  in the longitudinal direction (X-axis). In addition, one attachment means  904  is provided on the upper plate  120  and one attachment means  904  is provided on the lower plate  130  on the edge diagonally opposite to the base of the lateral plate  140 , where the first elastic member  150  terminates, to secure each magnet of the guiding magnets  902  in the transversal direction (Y-axis). 
     The attachment means  904  on the upper plate  120  and the lower plate  130  are arranged on each of the two parts  170  of the chassis  110  such that the upper plate  120  and the lower plate  130  form a mirror image of each other along the X-Y-plane. The attachments means  904  can be tabs, clips, holding brackets, etc. However, in this embodiment, the attachment means  904  are tabs stamped from the upper plate  120  and the lower plate  130  on each of the two parts  170  of the chassis  110  inwards towards the inside of the U-shape. In another variation, the attachment means  904  are clips, which are pressed after fixing the guiding magnets  902  to hold the guiding magnets  902  in the right orientation and position. 
     The magnetic field generated by the arrangement of magnets  320  should transverse the coils  410  orthogonally. However, due to the natural characteristics of the magnets, the magnetic field lines emerge from the north pole and converge to the south pole. The magnetic field lines are perpendicular as they emerge from the north poles of the first magnet  322  and the second magnet  324  at the center of the arrangement of magnets  320  and converge to the south poles forming an elliptical path. As the field lines generated move further away from the center of the arrangement of magnets  320  towards the end of the arrangement of magnets  320 , the magnetic field lines become convergent and elliptical paths become circular. Therefore, a major part of the magnetic field lines transverse the coils  410  at an angle but not at an orthogonal angle. To overcome this problem, the two guiding magnets  902  are attached on the inside of the upper plates  120  and the lower plates  130  of the two parts  170  of the chassis  110  such that the two guiding magnets  902  are opposite to each other and the transversal center line of each of the guiding magnets  902  longitudinally coincides with the transversal intersection line of the first magnet  322  and the second magnet  324  of the arrangement of magnets  320 . The guiding magnets  902  and the arrangement of magnets  320  are oriented such that their opposite poles face each other. For example, if the north pole of the first magnet  322  and the north pole of the second magnet  324  face each other, then the south poles of the guiding magnets  902  are placed directly above the north poles of the arrangement of magnets  320 . By placing the guiding magnets  902  in such a way, the magnetic field lines emerging from the center of the intersection of the first magnet  322  and the second magnet  324 , are guided orthogonally through the coils  410  through the guiding magnets  902  and then back into the arrangement of the magnets  320  at the outer poles  328 . As such, the magnetic field lines are directed at an angle that is substantially perpendicular to the coils  410 . As more of the magnetic field lines become perpendicular to the coils, the resulting Lorenz force is generated in a uniform direction which is aligned with the primary axis of vibration of the motor, which is along the longitudinal axis (X-axis). 
     Coming back to the two parts  170  of the chassis  110 , the upper plate  120  is orthogonally folded to form the lateral plate  140 . The lateral plate  140  is then orthogonally folded to form the lower plate  130  to form each of the two parts  170  of the chassis  110 . The two parts  170  of the chassis  110  are identical in shape, size, and dimensions. Furthermore, each of the two parts  170  of the chassis  110  includes the first elastic member  150  and the second elastic member  160 . The first elastic member  150  and the second elastic member  160  are fabricated by stamping and cutting the lateral plate  140  of each of the two parts of the chassis  110 . 
     The vibrating actuator  900  is constructed by placing the arrangement of magnets  320  in the frame  310 . The arrangement of magnets  320  comprises a first magnet  322  and the second magnet  324 , with like poles facing each other and the spacer  502  is placed in between the first magnet  322  and the second magnet  324 . This forms the first moving part  210 . The second moving part  220  comprises a coil  412  and U-shaped brackets  420 . The two ends of the coil  412  are connected to each of the U-shaped brackets  420 . In other variations, the coils  410  are formed by the first coil  412  and the second coil  414  which are connected with each other at one end, while the other two ends of the coils  410  are connected to each of the U-shaped brackets  420 . The first moving part  210  slides into the hollow of the second moving part  220  such that the first moving part  210  and the second moving part  220  can move freely. This assembly of the first moving part  210  and the second moving part  220  is placed between the two parts  170  of the chassis  110 . The two parts  170  of the chassis  110  include attachment means  904  for affixing the guiding magnets  902 . The guiding magnets  902  are then placed inside the upper plate  120  and the lower plate  130  and are secured firmly in the right orientation with the attachment means  904 . The two parts  170  of the chassis  110  are placed such that the second elastic members  160  of each of the two parts  170  point in the opposite direction along the transversal axis (Y-axis). The first moving part  210  is affixed to the first elastic member  150  at the rectangular plate  704  and the second moving part  220  is affixed to the second elastic member  160  at the rectangular plate  708 . The two parts  170  of the chassis  110  are affixed together to form the vibrating actuator  900 . 
       FIG. 11  illustrates an isometric view and  FIG. 12  illustrates an exploded isometric view of the vibrating actuator  1100 . In this embodiment, a vibrating actuator  1100  includes the chassis  110  comprising two parts  170 . The parts  170  of the chassis  110  include the upper plate  120  and the lower plate  130 . The upper plate  120  and the lower plate  130  are substantially smaller in length compared to the lateral plate  140 . The upper plate  120  and the lower plate  130  are similar in size, shape and dimension and form a mirror image of each other along the X-Y-plane. Furthermore, each upper plate  120  and the lower plate  130  is formed by a curved section  1104  and a rectangular section  1108 . In an alternate embodiment, the upper plate  120  and the lower plate  130  may vary in size, shape and dimensions. 
     Attachment means  904  are provided on each of the upper plate  120  and the lower plate  130  for affixing the guiding magnets  902 . The attachment means  904  are located at the intersection of the curved section  1104  and the rectangular section  1108 . The attachment means  904  are tabs, which hold the guiding magnets  902  in the right position and orientation. In other variations, the attachment means  904  can be clips, holding brackets, etc. that can be attached or fabricated in the upper plate  120  and the lower plate  130  for affixing the guiding magnets  904 . 
     The lateral plate  140  has two U-shaped projections, which form the first elastic member  150  and the second elastic member  160 . The first elastic member  150  is surrounded by the second elastic member  160  on three sides, while the fourth side of the first elastic member  150  and the second elastic member  160  terminate into the lateral plate  140  as shown in  FIG. 11 . Additionally, the first elastic member  150  and the second elastic member  160  can vibrate independently of each other and are disposed such that there is a gap between the first elastic member  150  and the second elastic member  160 . 
     The Y-Z-plane of the lateral plate  140  and the Y-Z-plane of the rectangular plate  704  of the first elastic member  150  are parallel to each other. The rectangular plate  704  is displaced towards the center of the vibrating actuator  1100  in the longitudinal axis (X-axis) compared to the lateral plate  140  by a distance, for example of 0.2 mm to 2 mm. The two legs  702  of the first elastic member  150  connect the lateral plate  140  with the rectangular plate  704  at an angle creating an inclination between the lateral plate  140  and rectangular plate  704 . Likewise, the Y-Z-plane of the lateral plate  140  and the Y-Z-plane of the rectangular plate  708  of the second elastic member  160  are parallel to each other. The rectangular plate  708  is displaced towards the center of the vibrating actuator  1100  in the longitudinal axis (X-axis) compared to the lateral plate  140  by a distance, for example between 0.2 mm to 2 mm. The two legs  706  of the second elastic member  160  connect the lateral plate  140  with the rectangular plate  708  at an angle creating an inclination between the lateral plate  140  and rectangular plate  708 . 
     Further, in this variation, from the second elastic member  160  protrudes a L-shaped structure  1204  towards the longitudinal center of the vibrating actuator  1100 , from the edge of the rectangular plate  708 , which is opposite to the two legs  706  to form a holder  1202 . The holder  1202  on the the second elastic member  160  provides an innovative way to hold the coils  410  or a single coil  412  in the right position during vibration. In this embodiment, the holder  1202  is U-shaped. 
     The first moving part  210  includes the arrangement of magnets  320 , which is formed by the first magnet  322  and the second magnet  324  with like poles facing each other. Additionally, the spacer  502  of non-magnetic material is placed in between the first magnet  322  and the second magnet  324 . The first magnet  322 , the spacer  502  and the second magnet  324  are glued together to form the first moving part  210 . The spacer  502  reduces the size of the first magnet  322  and the second magnet  324 , which is an efficient way of reducing cost of the magnets, which are rare earth metals and therefore expensive. Alternatively, the spacer  502  can be omitted and the magnets are glued directly together. 
     In this embodiment, the second moving part  220  comprises only one coil  412  without any U-shaped brackets  420 . The arrangement of magnets  320  is inserted into the coil  412 , the coil is placed inside the holder  1202  of the second elastic members  160  on each of the two parts  170  of the chassis  110  and secured with a binding material. Furthermore, the rectangular plate  704  of the first elastic member  150  of each of two parts  170  of the chassis  110  is attached to the first moving part  210 , that is, the arrangement of magnets  320 , such that the first elastic member  150  faces the outer poles  328 . Furthermore, each of the two parts  170  of the chassis  110  is assembled such that the first elastic member  150 , the second elastic member  160  and the lateral plate  140  face diagonally opposite to each other. 
     The two guiding magnets  902  are attached on the inside of the upper plates  120  and the lower plates  130  of the two parts  170  of the chassis  110  such that the two guiding magnets  902  are opposite to each other and the transversal center line of each of the guiding magnets  902  longitudinally coincides with the transversal intersection line of the first magnet  322  and the second magnet  324  of the arrangement of magnets  320 . The guiding magnets  902  and the arrangement of magnets  320  are oriented such that their opposite poles face each other. For example, if the north pole of the first magnet  322  and the north pole of the second magnet  324  face each other, then the south pole of the guiding magnets  902  are placed directly above the north poles of the arrangement of magnets  320 . 
     In this embodiment, the first moving part  210  comprises the arrangement of magnets  320 , having the first magnet  322  and the second second magnet  324 . The second moving part  220  comprises the coil  412 . However, in other embodiments, the arrangement of magnets  320  of the first moving part  210  can comprise more than two magnets and the second moving part  220  can comprise coils  410  as shown in  FIG. 5B-5C . 
     When the coils  410  are energised by an alternating electric current, the alternating current interacts with the permanent magnetic field of the arrangement of magnets  320  to produce two opposing forces according to the Lorentz Force principle. Initially, at rest, the two opposing forces move the first moving part  210  and the second moving part  220  in opposite directions. When the alternating current is reversed in the coils  410 , the alternating current interacts with the permanent magnetic field of the arrangement of magnets  320  to produce two opposing forces in the reverse direction. The first moving part  210  is constrained by the first elastic members  150  and produces a recoil due to elasticity. When the recoil energy stored in the first elastic members  150  is released, it aids the movement of the first moving part  210  thereby producing vibratory motion. Similarly, the second moving part  220  is constrained by the second elastic member  160  and produces a recoil due to elasticity. When the recoil energy stored in the second elastic members  160  is released it aids the movement of the second moving part  220  thereby producing vibratory motion. 
     The resonance frequency of the first moving part  210  depends upon at least the mass of the frame  310 , the mass of the arrangement of magnets  320 , and the elastic constant of the first elastic members  150 . In an alternate implementation, when the first moving part  210  is without frame  310 , the resonance frequency of the first moving part  210  depends upon at least the mass of the arrangement of magnets  320  and the elastic constant of the first elastic members  150 . Likewise, the resonance frequency of the second moving part  220  depends upon at least the mass of the U-shaped brackets  420 , the mass of the coils  410 , and the elastic constant of the second elastic member  160 . In an alternate implementation, when the second moving part  220  includes only the coils  410 , the resonance frequency of the second moving part  220  depends upon at least the mass of the coils  410  and the elastic constant of the second elastic member  160 . Finally, the first moving part  210  produces a linear oscillatory movement in the longitudinal direction (X-axis) with resonance frequency F 1  and the second moving part  220  produces a linear oscillatory movement in the longitudinal direction (X-axis) with resonance frequency F 2 . The first resonance frequency F 1  and the second resonance frequency F 2  are different and far apart. For example, the first resonance frequency F 1  can be 40 Hz and the second resonance frequency F 2  can be 75 Hz. 
     A directed magnetic field is generated by the arrangement of magnets  320  embedded inside the frame  310  with like poles facing each other. The magnetic field flows radially outwards (for example, outwards transversally (Y-axis)) from the arrangement of magnets  320 , at the intersection point of the arrangement of magnets  320 , where the north poles of the arrangement of magnets  320  face each other, and transverses the coils  410 . Additionally, guiding magnets  902  can be utilised to further direct the magnetic field lines at an angle that is perpendicular or almost perpendicular to the coils. Furthermore, the magnetic field flows inwards (for example, inward transversally (Y-axis)), transverses the coils  410  and into the arrangement of magnets  320 , at the intersection point of the arrangement of magnets  320 , where south poles of the arrangement of magnets  320  face each other. When the coils  410  are energized by passing the alternating current in the presence of the directed magnetic field, a force is produced on the second moving part  220  according to the Lorentz Force principle; accordingly, the first moving part  210  experiences a force in the opposite direction. Further, the first coil  412  and the second coil  414  are wound in opposite directions, so that when the current flows through the coils  410 , the second moving part  220  experiences a force unilaterally in one direction. When the alternating current is reversed, the second moving part  220  experiences a force in the opposite direction. This phenomenon creates vibratory motion in the second moving part  220 . Likewise, the first moving part  210  also experiences a force according to the Lorentz Force principle that produces a second vibratory motion independent of the first vibratory motion. The motion of the first moving part  210  is relative to the second moving part  220  and can be in the same direction or in the opposite direction. 
     The vibrating actuators described herein are exemplary only. Other configurations and variations provided herein are non-limiting and any modifications fall within the scope of the invention. The functionality and use of the vibrating actuator are for illustrative purposes and are not intended to be limiting in any manner. Other uses of vibrating actuators such use in medical devices, automobile dashboard or other areas having tactile feedback are well within the scope. Furthermore, the different components of the vibrating actuator can be suitably modified to provide additional functionality as demonstrated in different embodiments.