Patent Publication Number: US-2021167662-A1

Title: Tactile feedback mechanism

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation application of the U.S. patent application Ser. No. 17/037,066, filed on Sep. 29, 2020, which is a continuation application of the U.S. patent application Ser. No. 15/830,068, filed on Dec. 4, 2017, which claims priority to U.S. Provisional Application No. 62/431,556 filed on Dec. 8, 2016, and China Patent Application No. 201711079442.X, filed Nov. 6, 2017, the entirety of which are incorporated by reference herein. 
    
    
     BACKGROUND OF THE DISCLOSURE 
     Field of the Disclosure 
     The present disclosure relates to a tactile feedback mechanism, and more particularly to a tactile feedback mechanism utilizing sensing coils and magnets to generate an electromagnetic force to generate vibration. 
     Description of the Related Art 
     As technology has progressed, many kinds of electronic devices, such as tablet computers and smartphones, have been produced to include a vibration notification function. When performing a specific function, such an electronic device can vibrate, through the use of a built-in vibration device, in order to notify a user. For example, when the electronic device receives a message or the user presses a button on the electronic device, the electronic device can vibrate to notify the user that the message has been received or that the button has been pressed successfully. 
     A current vibration module that is widely used utilizes a rotary motor to drive an eccentric member to generate the vibration. However, the rotary motor is a conventional DC brush motor, and the thickness of the vibration module with the DC brush motor cannot be decreased any further. In addition, the eccentric member is disposed outside of the rotary motor and connected to a rotating shaft of the rotary motor, which means that the length of the vibration module cannot be decreased any further. As a result, the size of the vibration module cannot be reduced any further. Furthermore, the vibration module composed of the rotary motor and the eccentric member can only provide a vibration in a single direction or on a plane. 
     Therefore, how to design a tactile feedback mechanism capable of providing at least two directions or achieving miniaturization is an important subject for further research and development. 
     BRIEF SUMMARY OF THE DISCLOSURE 
     Accordingly, one objective of the present disclosure is to provide a tactile feedback mechanism utilizing electromagnetic force, so as to solve the problems described above. 
     According to some embodiments of the disclosure, a tactile feedback mechanism is provided, and the tactile feedback mechanism includes a fixed portion, a first movable portion, a first driving assembly, a second movable portion, and a second driving assembly. The first movable portion is moved relative to the fixed portion. The first driving assembly drives the first movable portion to move along a first direction relative to the fixed portion. The second movable portion is moved relative to the fixed portion and the first movable portion. The second driving assembly drives the second movable portion to move along a second direction relative to the fixed portion. The first direction and the second direction are different. The first movable portion and the second movable portion do not interfere with their respective movements. 
     In some embodiments, The tactile feedback mechanism further includes a first resilient element and a second resilient element. The first resilient element is connected the fixed portion and the first movable portion. The second resilient element is connected the fixed portion and the second movable portion. 
     In some embodiments, the tactile feedback mechanism further includes another first resilient element. The two first resilient elements are connected to opposite sides of the first movable portion, and the two first resilient elements are disposed along the first direction. 
     In some embodiments, the tactile feedback mechanism further includes another second resilient element. The two second resilient elements are connected to opposite sides of the second movable portion, and the two second resilient elements are disposed along the second direction. 
     In some embodiments, the first driving assembly includes a first magnetic element and a first induction coil corresponding to the first magnetic element. The first induction coil acts with the first magnetic element to drive the first movable portion to move along the first direction. 
     In some embodiments, the first driving assembly further includes other three first magnetic elements, and the four first magnetic elements are arranged in the first direction, two of the four first magnetic elements are disposed on a side of the first movable portion, other two of the four first magnetic elements are disposed on an opposite side of the first movable portion. 
     In some embodiments, the first driving assembly further includes other three first induction coils, and two of the four first induction coils are disposed on a side of the fixed portion, other two of the four first induction coils are disposed on an opposite side of the fixed portion. 
     In some embodiments, the second driving assembly includes a second magnetic element and a second induction coil corresponding to the second magnetic element. The second induction coil acts with the second magnetic element to drive the second movable portion to move along the second direction. 
     In some embodiments, the second driving assembly further includes other three second magnetic elements, and the four second magnetic elements are arranged in the second direction, two of the four second magnetic elements are disposed on a side of the second movable portion, other two of the four second magnetic elements are disposed on an opposite side of the second movable portion. 
     In some embodiments, the second driving assembly further includes other three second induction coils, and two of the four second induction coils are disposed on a side of the fixed portion, other two of the four second induction coils are disposed on an opposite side of the fixed portion. 
     In some embodiments, a first opening is formed on the first movable portion, and the second movable portion is disposed in the first opening. 
     In some embodiments, the first movable portion and the second movable portion are arranged in a third direction, and the third direction is substantially perpendicular to the first direction or the second direction. 
     In some embodiments, the tactile feedback mechanism further includes a third movable portion and a third driving assembly. The third driving assembly drives the third movable portion to move along a third direction relative to the fixed portion. The first direction, the second direction and the third direction are different. 
     In some embodiments, third driving assembly includes a third magnetic element and a third induction coil corresponding to the third magnetic element. The third induction coil acts with the third magnetic element to drive the third movable portion to move along the third direction. 
     In some embodiments, the third induction coil has a ring structure which surrounds a portion of the third movable portion, and the third magnetic element has a ring structure which surrounds the third induction coil. 
     In some embodiments, the third induction coil is disposed on the fixed portion, and the third magnetic element is disposed on the third movable portion. 
     In some embodiments, the tactile feedback mechanism further includes a third resilient element. The third resilient element is disposed between the third movable portion and the fixed portion. 
     In some embodiments, the third resilient element has an inner ring portion and an outer ring portion, the inner ring portion is connected to the third movable portion, and the outer ring portion is connected to the fixed portion. 
     In some embodiments, the tactile feedback mechanism further includes another third resilient element. The another third resilient element has an inner ring portion and an outer ring portion, the inner ring portion is connected to the third magnetic element, and the outer ring portion is connected to the fixed portion, and the two third resilient elements are disposed along the third direction. 
     In some embodiments, the first movable portion, the second movable portion, and the third movable portion do not interfere with their respective movements. 
     In conclusion, the present disclosure provides a vibration device that includes a stator, an eccentric wheel, and an electromagnetic driving assembly. Because the eccentric wheel and the electromagnetic driving assembly are disposed in the stator and on the same plane, the thickness of the vibration device can be decreased so as to achieve the purpose of miniaturization. In some embodiments, the present disclosure further provides a vibration device which can generate a vibration in single direction, generate vibrations in two directions generated independently or simultaneously, and generate vibrations in three directions, so that when the vibration device of the disclosure is installed in an electronic device (such as a smartphone or a tablet computer), a user can be notified of different messages by the different vibrations. 
     Additional features and advantages of the disclosure will be set forth in the description which follows, and, in part, will be obvious from the description, or can be learned by practice of the principles disclosed herein. The features and advantages of the disclosure can be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the disclosure will become more fully apparent from the following description and appended claims, or can be learned by the practice of the principles set forth herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic diagram of a vibration device according to an embodiment of the disclosure. 
         FIG. 2  is an exploded diagram of the vibration device in  FIG. 1 . 
         FIG. 3  is a top view of the vibration device in  FIG. 1  after removing the upper fixed member. 
         FIG. 4  is a diagram of a vibration device according to another embodiment of the disclosure. 
         FIG. 5  is an exploded diagram of the vibration device according to another embodiment of the disclosure. 
         FIG. 6  is a top view of a vibration device according to another embodiment of the disclosure. 
         FIG. 7  is a top view of a vibration device according to another embodiment of the disclosure. 
         FIG. 8  is an exploded diagram of a vibration device according to another embodiment of the disclosure. 
         FIG. 9  is a top view illustrating that a first vibration module is disposed on a fixed portion according to another embodiment of the disclosure. 
         FIG. 10  is a sectional view of the first magnetic element and the first induction coil along the line A-A′. 
         FIG. 11  is a diagram of the fixed portion and a circuit board according to another embodiment of the disclosure. 
         FIG. 12  is a structural diagram of a fixed portion according to another embodiment of the disclosure. 
         FIG. 13  is a diagram of a vibration device according to another embodiment of the disclosure. 
         FIG. 14  is an exploded diagram of the vibration device in  FIG. 13 . 
         FIG. 15  is a diagram of a vibration device according to another embodiment of the disclosure. 
         FIG. 16  is an exploded diagram of the vibration device in  FIG. 15 . 
         FIG. 17  is a diagram of a vibration device according to another embodiment of the disclosure. 
         FIG. 18  is an exploded diagram of the vibration device in  FIG. 17 . 
         FIG. 19  is a perspective cross-sectional view of the vibration device along the line B-B′ in  FIG. 17 . 
         FIG. 20  is a diagram of a vibration device according to another embodiment of the disclosure. 
         FIG. 21  is a sectional view along the line C-C′ in  FIG. 20 . 
     
    
    
     DETAILED DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENTS 
     In the following detailed description, for the purposes of explanation, numerous specific details and embodiments are set forth in order to provide a thorough understanding of the present disclosure. The specific elements and configurations described in the following detailed description are set forth in order to clearly describe the present disclosure. It will be apparent, however, that the exemplary embodiments set forth herein are used merely for the purpose of illustration, and the inventive concept may be embodied in various forms without being limited to those exemplary embodiments. In addition, the drawings of different embodiments may use like and/or corresponding numerals to denote like and/or corresponding elements in order to clearly describe the present disclosure. However, the use of like and/or corresponding numerals in the drawings of different embodiments does not suggest any correlation between different embodiments. The directional terms, such as “up”, “down”, “left”, “right”, “front” or “rear”, are reference directions for accompanying drawings. Therefore, using the directional terms is for description instead of limiting the disclosure. 
     In this specification, relative expressions are used. For example, “lower”, “bottom”, “higher” or “top” are used to describe the position of one element relative to another. It should be appreciated that if a device is flipped upside down, an element at a “lower” side will become an element at a “higher” side. 
     The terms “about” and “substantially” typically mean +/−20% of the stated value, more typically +/−10% of the stated value and even more typically +/−5% of the stated value. The stated value of the present disclosure is an approximate value. When there is no specific description, the stated value includes the meaning of “about” or “substantially”. 
     Please refer to  FIG. 1  and  FIG. 2 .  FIG. 1  is a schematic diagram of a vibration device  100  according to an embodiment of the disclosure, and  FIG. 2  is an exploded diagram of the vibration device  100  in  FIG. 1  according to the embodiment of the disclosure. As shown in  FIG. 1  and  FIG. 2 , the vibration device  100  includes a upper fixed member  102 , a plurality of upper induction coils, at least one magnetic element, an eccentric wheel  106 , a plurality of lower induction coils, a rotating shaft  110  and lower fixed member  112 . In this embodiment, the upper fixed member  102  and the lower fixed member  112  can be defined as a stator of the vibration device  100 . The upper fixed member  102  and the lower fixed member  112  respectively include an upper opening  1021  and a lower opening  1121 . The eccentric wheel  106  includes a central opening  1061 , and the rotating shaft  110  is disposed through the central opening  1061 , the upper opening  1021  and the lower opening  1121  and is disposed on the upper fixed member  102  and the lower fixed member  112  through a bearing structure (not shown in the figures). As a result, the eccentric wheel  106  can be driven by the rotating shaft  110  to rotate around the Z-axis relative to the upper fixed member  102  and the lower fixed member  112 . 
     In this embodiment, the upper induction coils, the lower induction coils and at least one magnetic element can be defined as an electromagnetic driving assembly of the vibration device  100 . The vibration device  100  further includes a first magnetic element  114  and a second magnetic element  116 , and the eccentric wheel  106  further includes a first slot  1062 , a second slot  1063 , a protruding portion  1064 , a protruding portion  1065  and a protruding portion  1066 . The first slot  1062  is formed between the protruding portion  1064  and the protruding portion  1065 , and the second slot  1063  is formed between the protruding portion  1065  and the protruding portion  1066 . The first slot  1062  and the second slot  1063  are for accommodating the second magnetic element  116  and the first magnetic element  114 , respectively. In this embodiment, when the first magnetic element  114  and the second magnetic element  116  are disposed on the eccentric wheel  106 , the magnetic pole directions of the first magnetic element  114  and the second magnetic element  116  are parallel to the direction of the rotating shaft  110  (i.e. parallel to the Z-axis). The North pole of the first magnetic element  114  and the South pole of the second magnetic element  116  face the upper fixed member  102 , and the South pole of the first magnetic element  114  and the North pole of the second magnetic element  116  face the lower fixed member  112 . In some embodiments, the first magnetic element  114  and the second magnetic element  116  can be multipole magnets. In addition, it should be noted that the protruding portion  1064 , the protruding portion  1065  and the protruding portion  1066 , the first magnetic element  114  and the second magnetic element  116  can constitute a fan-shaped structure. 
     As shown in  FIG. 2 , the upper fixed member  102  and the lower fixed member  112  respectively have a disk-shaped structure. The upper fixed member  102  includes a lower surface  1022 , and six protruding portions  1023  are formed on the lower surface  1022 . The lower fixed member  112  includes an upper surface  1122 , and six protruding portions  1123  corresponding to the six protruding portions  1023  are formed on the upper surface  1122 . The lower surface  1022  and the upper surface  1122  face the eccentric wheel  106 . In this embodiment, the vibration device  100  includes six upper induction coils  1041 ˜ 1046  and six lower induction coils  1081 ˜ 1086 . The upper induction coils  1041 ˜ 1046  are respectively disposed on the protruding portions  1023 , and the lower induction coils  1081 ˜ 1086  are respectively disposed on the protruding portions  1123  on the upper surface  1122 . In this embodiment, the upper induction coils  1041 ˜ 1046  and the lower induction coils  1081 ˜ 1086  are disposed corresponding to the first magnetic element  114  and the second magnetic element  116 . 
     Please refer to  FIG. 2  and  FIG. 3 .  FIG. 3  is a top view of the vibration device  100  in  FIG. 1  after removing the upper fixed member  102  according to the embodiment of the disclosure. As shown in  FIG. 3 , an initial position of the first magnetic element  114  can be between the upper induction coil  1042  and upper induction coil  1043 , and an initial position of the second magnetic element  116  can be between upper induction coil  1041  and the upper induction coil  1042 . When a current is applied to the upper induction coils  1041 ˜ 1046  and the lower induction coils  1081 ˜ 1086  (the lower induction coils  1081 ˜ 1086  are not shown in  FIG. 3  due to the angle of view), the upper induction coils  1041 ˜ 1046  and the lower induction coils  1081 ˜ 1086  respectively act with the first magnetic element  114  and the second magnetic element  116  to generate the electromagnetic force, so as to drive the eccentric wheel  106  to rotate around the rotating shaft  110 . In particular, as the example in  FIG. 2  and  FIG. 3 , the upper induction coil  1041  and the lower induction coil  1081  are respectively act with the second magnetic element  116  to generate an magnetic rejection force, the upper induction coil  1042  and the lower induction coil  1082  respectively act with the second magnetic element  116  to generate a magnetic attraction force, and the upper induction coil  1043  and the lower induction coil  1083  respectively act with the first magnetic element  114  to generate a magnetic rejection force, so as to drive the first magnetic element  114 , the second magnetic element  116  and the eccentric wheel  106  to rotate counterclockwise around the Z-axis. It should be noted that the current applied to the upper induction coils  1041 ˜ 1046  and the lower induction coils  1081 ˜ 1086  can be a direct current or an alternating current, and the phase of each current which is applied to the upper induction coils  1041 ˜ 1046  and the lower induction coils  1081 ˜ 1086  can be the same or different. 
     Because the center of gravity of the first magnetic element  114 , the second magnetic element  116  and the eccentric wheel  106  is deviated from the rotating shaft  110  to the fan-shaped structure and is not on the rotating shaft  110 , when the first magnetic element  114 , the second magnetic element  116  and the eccentric wheel  106  rotate around the rotating shaft  110 , the rotation of the first magnetic element  114 , the second magnetic element  116  and the eccentric wheel  106  causes the vibration device  100  to generate a vibration along the XY plane. In addition, the vibration device  100  can further include a position sensor  118  (sensing element), configured to sense the position of the eccentric wheel  106  when rotating. As shown in  FIG. 2 , the vibration device  100  includes three position sensors  118 , which are disposed on the lower fixed member  112  and located between two protruding portions  1123 . 
     It should be noted that the eccentric wheel  106  served as a rotor of the vibration device  100  is disposed between the upper fixed member  102  and the lower fixed member  112 , so that this design can decrease the thickness of the vibration device  100  along the Z-axis, so as to achieve the purpose of miniaturization. 
     Please refer to  FIG. 4  and  FIG. 5 .  FIG. 4  is a diagram of a vibration device  200  according to another embodiment of the disclosure.  FIG. 5  is an exploded diagram of the vibration device  200  according to another embodiment of the disclosure. In this embodiment, the vibration device  200  includes a stator  202 , a plurality of induction coils  204 , an eccentric wheel  206 , a rotating shaft  208 , a third magnetic element  210  and a fourth magnetic element  212 . In this embodiment, the stator  202  has a ring structure, an inner surface  2021  and a plurality of protruding portion  2023  formed on the inner surface  2021 . The induction coils  204  correspond to the third magnetic element  210  and the fourth magnetic element  212 , and the induction coils  204  are disposed on the protruding portion  2023  of the inner surface  2021 . 
     Similar to the previous embodiment, the third magnetic element  210  and the fourth magnetic element  212  can be installed in a first slot  2061  and a second slot  2062  of the eccentric wheel  206 , and the eccentric wheel  206  can rotate around the rotating shaft  208 . It should be noted that the magnetic pole directions of the third magnetic element  210  and the fourth magnetic element  212  are radially perpendicular to the direction of the rotating shaft  208  (the direction along the Z-axis), as shown in  FIG. 4 . More specifically, the North pole of the third magnetic element  210  faces the stator  202  and the South pole of the third magnetic element  210  faces the rotating shaft  208 . Comparatively, the South pole of the fourth magnetic element  212  faces the stator  202 , and the North pole of the fourth magnetic element  212  faces the rotating shaft  208 . When the induction coils  204  are supplied with electricity, the induction coils  204  respectively acts with the third magnetic element  210  and the fourth magnetic element  212  to generate the electromagnetic force, so as to drive the third magnetic element  210 , the fourth magnetic element  212  and the eccentric wheel  206  to rotate around the rotating shaft  208 . Because the center of gravity of the third magnetic element  210 , the fourth magnetic element  212  and the eccentric wheel  206  is deviated from the rotating shaft  208 , when the eccentric wheel  206  rotates, the rotation causes the vibration device  200  to generate a vibration along the XY plane. 
     In addition, the vibration device  200  can include at least one sensing element  214 . As shown in  FIG. 5 , the vibration device  200  includes three sensing elements  214 , disposed on an upper surface  2025  of the stator  202 , but the position and the number of the sensing element  214  are not limited thereto. For example, the sensing element  214  can also be disposed between two protruding portions  2023  on the inner surface  2021 . It should be noted that the induction coils  204 , the eccentric wheel  206 , the third magnetic element  210  and the fourth magnetic element  212  are all located on the same plane (the XY plane), so that the thickness of the vibration device  200  along the Z-axis in this embodiment can be decreased further, so as to achieve the purpose of miniaturization. 
     Please refer to  FIG. 6 , which is a top view of a vibration device  300  according to another embodiment of the disclosure. The vibration device  300  in this embodiment is similar to the vibration device  200  in  FIG. 4 , and the difference between these two vibration devices is that a stator  302  of the vibration device  300  in this embodiment has a frame structure. As shown in  FIG. 6 , the stator  302  includes an inner surface  3021 , and four first protruding portions  3023  are formed on the inner surface  3021  and located at four corners of the stator  302 . 
     In addition, the vibration device  300  can include the eccentric wheel  206 , the rotating shaft  208 , the third magnetic element  210 , the fourth magnetic element  212  and four induction coils  304 . The induction coils  304  are respectively disposed on the first protruding portions  3023  and face the eccentric wheel  206 . Similarly, the North pole of the third magnetic element  210  faces the stator  202  and the South pole of the third magnetic element  210  faces the rotating shaft  208 , and the South pole of the fourth magnetic element  212  faces the stator  202  and the North pole of the fourth magnetic element  212  faces the rotating shaft  208 . When the induction coils  304  are supplied with electricity, the induction coils  304  respectively acts with the third magnetic element  210  and the fourth magnetic element  212  to generate the electromagnetic force, so as to drive the third magnetic element  210 , the fourth magnetic element  212  and the eccentric wheel  206  to rotate around the rotating shaft  208 . Because the center of gravity of the third magnetic element  210 , the fourth magnetic element  212  and the eccentric wheel  206  is deviated from the rotating shaft  208 , when the eccentric wheel  206  rotates, the rotation causes the vibration device  300  to generate a vibration along the XY plane. 
     Furthermore, as shown in  FIG. 6 , there can be four second protruding portions  3025  formed on the inner surface  3021  of the stator  302 , and the four second protruding portions  3025  are located on four sides of the stator  302 . The vibration device  300  can include at least one sensing element  306  for sensing the position of the eccentric wheel  206  when rotating. In this embodiment, the vibration device  300  includes three sensing elements  306 , respectively disposed on three second protruding portions  3025 , and each of the sensing elements  306  is located between two adjacent induction coils  304 . It is noted that the sensing element  306  can also be disposed on the inner surface  3021  in other embodiments. 
     Because the electromagnetic driving assembly and the eccentric wheel  206  are positioned on the same plane (the XY plane), the thickness of the vibration device  300  along the Z-axis can also be decreased. 
     Please refer to  FIG. 7 , which is a top view of a vibration device  300 A according to another embodiment of the disclosure. The vibration device  300 A is similar to the vibration device  300  in the previous embodiment, and the difference between these two vibration devices is that the four induction coils  304  are respectively disposed on the second protruding portions  3025  of the four sides and face the eccentric wheel  206 , and the three sensing elements  306  are disposed on the three first protruding portions  3023  in this embodiment. The positions of the induction coils  304  and the sensing elements  306  depend on practical design requirements. For example, the sensing element  306  can also be disposed on the inner surface  3021 . The driving mechanism of the vibration device  300 A is similar to that of the previous embodiment, and the description is therefore omitted herein. 
     Please refer to  FIG. 8  and  FIG. 9 .  FIG. 8  is an exploded diagram of a vibration device  400  according to another embodiment of the disclosure, and  FIG. 9  is a top view of  FIG. 8  illustrating that a first vibration module  404  is disposed on a fixed portion  402 . As shown in  FIG. 8 , the vibration device  400  includes a cover  401 , the fixed portion  402  and the first vibration module  404 . The first vibration module  404  is disposed inside the fixed portion  402 , and the cover  401  is fixed to the fixed portion  402 . The first vibration module  404  can include a first movable member  406 , at least one first resilient element  408 , at least one first magnetic element  410  and at least one first induction coil  412 . In this embodiment, the first vibration module  404  can include two first resilient elements  408 , five first magnetic elements  410  and eight first induction coils  412 . 
     As shown in  FIG. 8  and  FIG. 9 , the first movable member  406  has a rectangular structure, and a plurality of installing slots  4061  corresponding to the first magnetic elements  410  are formed on the first movable member  406  for accommodating the first magnetic elements  410 . The North poles of the first, third and fifth first magnetic elements  410  extend toward the −Z-axis, and the North poles of the second and fourth first magnetic elements  410  extend toward the Z-axis. The two first resilient element  408  are arranged along the Y-axis and are located two opposite sides of the first movable member  406 , and the first resilient elements  408  are configured to connect the first movable member  406  to the fixed portion  402 . It should be noted that the first movable member  406  are suspended in the fixed portion  402  by the two first resilient elements  408 , and the first movable member  406  is not in contact with the fixed portion  402 . In addition, as shown in  FIG. 9 , the two first resilient elements  408  are connected to two opposite sides of the first movable member  406 , and the two first resilient elements  408  are disposed in different directions. That is, the fixed portion  402  can define a central line CL perpendicular to the Y-axis (first axial direction), and the two first resilient elements  408  are rotational symmetry relative to the central line CL. 
     As shown in  FIG. 8 , the four first induction coils  412  are disposed above the first movable member  406  and are securely disposed on the cover  401 . The other four first induction coils  412  are disposed below the first movable member  406  and are securely disposed inside the fixed portion  402 . 
     As shown in  FIG. 9 , the first magnetic elements  410  and the first induction coils  412  are disposed in a staggered manner. When the first induction coils  412  are supplied with electricity, the first induction coils  412  act with the first magnetic elements  410  to generate the electromagnetic force, so as to drive the first movable member  406  to move along the Y-axis (the first axis direction). Because the first induction coils  412  receive the alternating current, the direction of the electromagnetic force continuously changes, so that the first movable member  406  repeatedly moves rightward and leftward in the fixed portion  402  along the Y-axis, causing a vibration of the vibration device  400  along the Y-axis. 
     In addition, the vibration device  400  can further include two weight blocks  414  and a plurality of gels  416 , configured to adjust a resonant frequency when the vibration device  400  vibrates. In this embodiment, the two weight blocks  414  are symmetrically disposed on two opposite sides of the first movable member  406 . As shown in  FIG. 9 , the gel  416  can be disposed between the first movable member  406  and the first resilient element  408  or disposed between the fixed portion  402  and the first movable member  406 . The gel  416  is not only configured to adjust the resonant frequency of the vibration device  400 , but also has a cushion function. For achieve the effect of cushion, the gel  416  can also be disposed between a bottom portion  4081  of the first resilient element  408 , or disposed between the first magnetic element  410  and the fixed portion  402 . Positions of the gels  416  are not limited to the present disclosure. 
     Furthermore, the vibration device  400  can also include at least one sensing element  418 , disposed on the first movable member  406 , and the sensing element  418  is configured to sense a position of the first movable member  406  relative to the fixed portion  402 . Specifically, in this embodiment, the sensing element  418  is disposed between two first magnetic elements  410  (as shown in  FIG. 8 ). Based on the structural design of this embodiment, the vibration device  400  can provides a vibration in the Y-axis, and the thickness of the vibration device  400  along the Z-axis can also be decreased. 
     Please refer to  FIG. 10 , which is a sectional view of the first magnetic element  410  and the first induction coil  412  along the line A-A′ in  FIG. 9  according to the embodiment of the disclosure. For convenience of description, only one first magnetic element  410  and two adjacent first induction coils  412  are shown in  FIG. 10 . The first magnetic element  410  has a width c along the Y-axis (the first axial direction), and a minimum distance a and a maximum distance b are formed between the two first induction coils  412 . The first magnetic element  410  is disposed between the two adjacent first induction coils  412 , and the width c of the first magnetic element  410  is greater than the minimum distance a and is less than the maximum distance b. 
     Please refer to  FIG. 11 , which is a diagram of the fixed portion  402  and a circuit board  420  according to another embodiment of the disclosure. In this embodiment, the vibration device (such as the vibration device  400  in  FIG. 8 ) can further include the circuit board  420 , disposed on the fixed portion  402 , and the first induction coils  412  can be disposed inside the circuit board  420  (the circuit board  420  and the first induction coils  412  can constitute a plate coil). Because there can be fewer turns of the plate coil, the thickness of the plate coil can be smaller, and the thickness of the vibration device (such as the vibration device  400  in  FIG. 8 ) along the Z-axis can be decreased further. 
     Please refer to  FIG. 12 , which is a structural diagram of a fixed portion  402 A according to another embodiment of the disclosure. In this embodiment, the fixed portion  402 A can be a metal member, and the vibration device (such as the vibration device  400  in  FIG. 8 ) can further include an insulation layer  422  and a plurality of conductive layers  424 . The insulation layer  422  is disposed between the conductive layers  424  and the fixed portion  402 A. It should be noted that the conductive layers  424  can constitute an induction coil (such as the first induction coil  412 ), and the induction coil which is constituted by the conductive layers  424  has a smaller thickness along the Z-axis, so that the thickness of the vibration device along the Z-axis can be decreased further. 
     Please refer to  FIG. 13  and  FIG. 14 .  FIG. 13  is a diagram of a vibration device  500  according to another embodiment of the disclosure, and  FIG. 14  is an exploded diagram of the vibration device  500  in  FIG. 13 . As shown in  FIG. 13 , the vibration device  500  includes a fixed portion  502 , a first vibration module  504  and a second vibration module  506 . In this embodiment, the fixed portion  502  includes a separating plate  5021 , and the first vibration module  504  and the second vibration module  506  are disposed inside the fixed portion  502  and are located on two sides of the separating plate  5021 . In this embodiment, the first vibration module  504  is configured to generate a vibration along the Y-axis (the first axial direction), and the second vibration module  506  is configured to generate a vibration along the X-axis (a second axial direction). The first axial direction is not parallel to the second axial direction. For example, the first axial direction can be substantially perpendicular to the second axial direction. 
     As shown in  FIG. 14 , the first vibration module  504  includes a first movable member  508 , three first magnetic elements  510 , four first induction coils  512  and two first resilient elements  514 . In this embodiment, the three first magnetic elements  510  are disposed in the first movable member  508 , and the four first induction coils  512  corresponding to the first magnetic elements  510  are disposed on two sides of the first movable member  508  along the Z-axis. Two first induction coils  512  are securely disposed in the fixed portion  502 , and the other two first induction coils  512  are securely disposed on a cover of the fixed portion  502  (the cover is not shown in the figures). The two first resilient elements  514  are respectively disposed on two sides of the first movable member  508  along the Y-axis, so as to suspend the first movable member  508  in the fixed portion  502 . 
     In addition, the second vibration module  506  includes a second movable member  516 , three second magnetic elements  518 , four second induction coils  520  and two second resilient elements  522 . In this embodiment, the three second magnetic elements  518  are disposed in the second movable member  516 , and the four second induction coils  520  corresponding to the second magnetic elements  518  are disposed on two sides of the second movable member  516  along the Z-axis. Two second induction coils  520  are securely disposed in the fixed portion  502 , and the other two second induction coils  520  are securely disposed on the cover (the cover is not shown in the figures). The two second resilient elements  522  are respectively disposed on two sides of the second movable member  516  along the Y-axis, and the second resilient elements  522  are configured to suspend the second movable member  516  in the fixed portion  502 . 
     Similar to the previous embodiment, when the first induction coils  512  are supplied with electricity, the first induction coils  512  act with the first magnetic elements  510  to generate the electromagnetic force, so as to drive the first movable member  508  to move along the Y-axis, so that the vibration device  500  generates a vibration along the Y-axis. When the second induction coils  520  are supplied with electricity, the second induction coils  520  act with the second magnetic elements  518  to generate the electromagnetic force, so as to drive the second movable member  516  to move along the X-axis, so that the vibration device  500  generates a vibration along the X-axis. It should be noted that the first vibration module  504  and the second vibration module  506  can generate the vibrations at the same time, or can separately generate the vibrations. 
     Furthermore, the vibration device  500  can further include at least one sensing element  524 , disposed on the first movable member  508  or on the second movable member  516 , and the sensing element  524  is configured to sense the movement of the first movable member  508  or the second movable member  516 . In this embodiment, the vibration device  500  includes two sensing elements  524 , respectively disposed on the first movable member  508  and the second movable member  516 . 
     Based on the design of the first vibration module  504  and the second vibration module  506  in this embodiment, the vibration device  500  can provides vibrations in two directions. In addition, in another embodiment, the separating plate  5021  in  FIG. 14  can be omitted in the fixed portion  502 , and the first resilient element  514  between the first movable member  508  and the second movable member  516  can be directly connected to the second movable member  516 . 
     Next, please refer to  FIG. 15  and  FIG. 16 .  FIG. 15  is a diagram of a vibration device  600  according to another embodiment of the disclosure.  FIG. 16  is an exploded diagram of the vibration device  600  in  FIG. 15 . As shown in  FIG. 15 , the vibration device  600  includes a fixed portion  602 , a first vibration module  604  and a second vibration module  606 . In this embodiment, the first vibration module  604  and the second vibration module  606  are disposed inside the fixed portion  602 . In this embodiment, the first vibration module  604  is configured to generate a vibration along the Y-axis (the first axial direction), and the second vibration module  606  is configured to generate a vibration along the X-axis (the second axial direction). The first axial direction is not parallel to the second axial direction. 
     As shown in  FIG. 16 , the first vibration module  604  includes a first movable member  608 , six first magnetic elements  610 , eight first induction coils  612  and two first resilient elements  614 . In this embodiment, three first magnetic elements  610  are disposed on one side of the first movable member  608 , and the other three first magnetic elements  610  are disposed on the other side of the first movable member  608 . The eight first induction coils  612  corresponding to the first magnetic elements  610  are disposed on two sides of the first movable member  608  along the Z-axis. Four first induction coils  612  are securely disposed in the fixed portion  602 , and the other four first induction coils  612  are securely disposed on a cover of the fixed portion  602  (the cover is not shown in the figures). The two first resilient elements  614  are respectively disposed on two sides of the first movable member  608  along the Y-axis, so as to suspend the first movable member  608  in the fixed portion  602 . It should be noted that a first opening  6081  is formed on a central position of the first movable member  608 , and the first opening  6081  is configured to accommodate the second vibration module  606 . 
     In this embodiment, the second vibration module  606  includes a second movable member  616 , two second magnetic elements  618 , two second induction coils  620  and two second resilient elements  622 . In this embodiment, two second magnetic elements  618  are disposed in the second movable member  616 , and the two second induction coils  620  corresponding to the second magnetic elements  618  are disposed on two sides of the second movable member  616  along the Z-axis. One second induction coil  620  is securely disposed in the fixed portion  602 , and the other one second induction coil  620  is securely disposed on the cover (the cover is not shown in the figures). It should be noted that the two second resilient elements  622  are respectively disposed on two sides of the second movable member  616  along the X-axis, and the second resilient elements  622  are configured to suspend the second movable member  616  in the first opening  6081  of the first movable member  608 . 
     When the first induction coils  612  are supplied with electricity, the first induction coils  612  act with the first magnetic elements  610  to generate the electromagnetic force, so as to drive the first movable member  608  to move along the Y-axis, so that the vibration device  600  generates a vibration along the Y-axis. When the second induction coils  620  are supplied with electricity, the second induction coils  620  act with the second magnetic elements  618  to generate the electromagnetic force, so as to drive the second movable member  616  to move along the X-axis, so that the vibration device  600  generates a vibration along the X-axis. Similarly, the first vibration module  604  and the second vibration module  606  can generate the vibrations at the same time, or can separately generate the vibrations. 
     Furthermore, the vibration device  600  can further include at least one sensing element  624 , disposed on the first movable member  608  or on the second movable member  616 , and the sensing element  624  is configured to sense the movement of the first movable member  608  or the second movable member  616 . In this embodiment, the vibration device  600  includes one sensing element  624 , disposed on the first movable member  608  and located between two adjacent first magnetic elements  610 . 
     The vibration device  600  in this embodiment provides the vibrations in two directions, and the second vibration module  606  is disposed in the first opening  6081  of the first movable member  608 , so that the length of the vibration device  600  along the Y-axis can be further decreased, so as to achieve the purpose of miniaturization. 
     Please refer to  FIG. 17  and  FIG. 18 .  FIG. 17  is a diagram of a vibration device  700  according to another embodiment of the disclosure.  FIG. 18  is an exploded diagram of the vibration device  700  in  FIG. 17 . As shown in  FIG. 17 , the vibration device  700  includes a fixed portion  702 , a first vibration module  704 , a second vibration module  706  and a third vibration module  707 . In this embodiment, the first vibration module  704  is configured to generate a vibration along the Y-axis (the first axial direction), the second vibration module  706  is configured to generate a vibration along the X-axis (the second axial direction), and the third vibration module  707  is configured to generate a vibration along the Z-axis (the third axial direction). 
     As shown in  FIG. 18 , the first vibration module  704  includes a first movable member  708 , four first magnetic elements  710 , four first induction coils  712  and two first resilient elements  714 . In this embodiment, four first magnetic elements  710  are disposed in the first movable member  708 , and the four first induction coils  712  corresponding to the first magnetic elements  710  are disposed on two sides of the first movable member  708  along the Z-axis. Two first induction coils  712  are securely disposed in the fixed portion  702 , and the other two first induction coils  712  are securely disposed on a cover of the fixed portion  702  (the cover is not shown in the figures). The two first resilient elements  714  are respectively disposed on two sides of the first movable member  708  along the Y-axis, so as to suspend the first movable member  708  in the fixed portion  702 . 
     In addition, the second vibration module  706  includes a second movable member  716 , four second magnetic elements  718 , four second induction coils  720  and two second resilient elements  722 . In this embodiment, the four second magnetic elements  718  are disposed in the second movable member  716 , and the four second induction coils  720  corresponding to the second magnetic elements  718  are disposed on two sides of the second movable member  716  along the Z-axis. Two second induction coils  720  are securely disposed in the fixed portion  702 , and the other two second induction coils  720  are securely disposed on the cover (the cover is not shown in the figures). The two second resilient elements  722  are respectively disposed on two sides of the second movable member  716  along the X-axis, and the second resilient elements  722  are configured to suspend the second movable member  716  in the fixed portion  702 . 
     It should be noted that the first movable member  708  includes a first slot  7081 , and the second movable member  716  includes a second slot  7161 . The first slot  7081  is configured to face the second slot  7161  and is substantially align with the second slot  7161 , and the first movable member  708  and the second movable member  716  are arranged along the Z-axis (the third axial direction). In this embodiment, the third axial direction can be perpendicular to the first axial direction or the second axial direction. In addition, the first movable member  708  further includes a first opening  7082 , the second movable member  716  further includes a second opening  7162 , and the third vibration module  707  can be disposed in the first opening  7082  and the second opening  7162 . 
     Please refer to  FIG. 18  and  FIG. 19 .  FIG. 19  is a perspective cross-sectional view of the vibration device  700  along the line B-B′ in  FIG. 17  according to the embodiment of the disclosure. As shown in  FIG. 18 , the third vibration module  707  includes a third movable member  724 , a third magnetic element  726 , a third induction coil  728  and two third resilient elements  730 . In this embodiment, the third movable member  724  includes a bottom portion  7241  and a protruding portion  7242 , the third induction coil  728  is fixed to the cover (not shown in the figures), and the third induction coil  728  has a ring structure which surrounds the protruding portion  7242  and is not in contact with the protruding portion  7242 . The third magnetic element  726  has a ring structure which surrounds the third induction coil  728 , and the third magnetic element  726  is securely disposed on the third movable member  724 . One of the third resilient elements  730  (such as the lower third resilient elements  730  in  FIG. 18 ) is disposed between the fixed portion  702  and the third movable member  724 , and is configured to connect the fixed portion  702  with the bottom portion  7241  of the third movable member  724 . More specifically, an inner ring portion of the third resilient elements  730  is connected to the bottom portion  7241  of the third movable member  724 , and an outer ring portion of the third resilient elements  730  is connected to the fixed portion  702 . Furthermore, the other third resilient elements  730  (such as the upper third resilient elements  730  in  FIG. 18 ) is disposed between the cover (not shown in the figures) and the third magnetic element  726 . The third magnetic element  726  is connected to an inner ring portion of the third resilient elements  730 , and an outer ring portion of the third resilient elements  730  is connected to the cover (not shown in the figures). It should be noted that the first movable member  708  is suspended in the fixed portion  702 , and the second movable member  716  is suspended in the fixed portion  702  and is not in contact with the first movable member  708  as shown in  FIG. 19 . Moreover, the third movable member  724  is not in contact with the first movable member  708  or the second movable member  716 . 
     When the first induction coils  712  are supplied with electricity, the first induction coils  712  act with the first magnetic elements  710  to generate the electromagnetic force, so as to drive the first movable member  708  to move along the Y-axis, so that the vibration device  700  generates a vibration along the Y-axis. When the second induction coils  720  are supplied with electricity, the second induction coils  720  act with the second magnetic elements  718  to generate the electromagnetic force, so as to drive the second movable member  716  to move along the X-axis, so that the vibration device  700  generates a vibration along the X-axis. When the third induction coil  728  is supplied with electricity, the third induction coil  728  acts with the third magnetic element  726  to generate the electromagnetic force, so that the third magnetic element  726  drives the third movable member  724  to move along the Z-axis. As a result, the vibration device  700  generates a vibration along the Z-axis. The first vibration module  704 , the second vibration module  706  and the third vibration module  707  can generate the vibrations at the same time, or can separately generate the vibrations. In addition, as shown in  FIG. 18 , the vibration device  700  can include three sensing elements  732 , respectively disposed on the first movable member  708 , the second movable member  716  and the third movable member  724 . The sensing elements  732  are configured to sense the movement of the first movable member  708 , the second movable member  716  and the third movable member  724 . 
     Please refer to  FIG. 20  and  FIG. 21 .  FIG. 20  is a diagram of a vibration device  800  according to another embodiment of the disclosure, and  FIG. 21  is a sectional view along the line C-C′ in  FIG. 20 . As shown in  FIG. 20 , the vibration device  800  includes a fixed portion  802 , a first vibration module  804  and a second vibration module  806 , and the first vibration module  804  includes a first movable member  808 , four first magnetic elements  810 , four first induction coils  812  and two first resilient elements  814 . Positions and relative relationship of each element of the first vibration module  804  is similar to the first vibration module  604  in  FIG. 15 , and is omitted herein. Specifically, the first movable member  808  includes an opening  8081 , and the second vibration module  806  is engaged in the opening  8081 . 
     As shown in  FIG. 21 , the second vibration module  806  includes a base  816 , a second magnetic element  818 , a second induction coil  820  and two second resilient elements  822 . In this embodiment, the base  816  includes a protruding portion  8161 , and the second induction coil  820  sheathes on the protruding portion  8161 . The two second resilient elements  822  suspend the second magnetic element  818  in the base  816 . The second magnetic element  818  has a ring structure and movably surrounds the second induction coil  820 . 
     When the first induction coils  812  are supplied with electricity, the first induction coils  812  act with the first magnetic elements  810  to generate the electromagnetic force, so as to drive the first movable member  808  to move along the Y-axis, so that the vibration device  800  generates a vibration along the Y-axis. When the second induction coil  820  is supplied with electricity, the second induction coil  820  acts with the second magnetic element  818  to generate the electromagnetic force, so as to drive the second magnetic element  818  to move along the Z-axis, so that the vibration device  800  generates a vibration along the Z-axis. Similarly, the first vibration module  804  and the second vibration module  806  can generate the vibrations at the same time, or can separately generate the vibrations. In addition, the vibration device  800  can also include two sensing elements (not shown in the figures) respectively disposed on the first movable member  808  and the base  816 , and the sensing elements are configured to sense the movement of the first movable member  808  and the base  816 . 
     In conclusion, the present disclosure provides a vibration device that includes a stator, an eccentric wheel and an electromagnetic driving assembly. Because the eccentric wheel and the electromagnetic driving assembly are disposed in the stator and on the same plane, the thickness of the vibration device can be decreased, so as to achieve the purpose of miniaturization. In some embodiments, the present disclosure further provides a vibration device which can generate a vibration in single direction, generate vibrations in two directions generated independently or simultaneously, and generate vibrations in three directions, so that when the vibration device of the disclosure is installed in an electronic device (such as a smartphone or a tablet computer), a user can be notified of different messages by the different vibrations. 
     Although the embodiments and their advantages have been described in detail, it should be understood that various changes, substitutions, and alterations can be made herein without departing from the spirit and scope of the embodiments as defined by the appended claims. Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods, and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the disclosure. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps. In addition, each claim constitutes a separate embodiment, and the combination of various claims and embodiments are within the scope of the disclosure.