Vibration Actuator

Abstract

To provide a vibration actuator which can generate various vibrations.SOLUTION: A vibration actuator has: a pair of facing elastic bodies 10; a first mover 20 and a second mover 30 which are arranged between the pair of elastic bodies 10 and are independently supported by the elastic bodies 10 in a displaceable manner; and a case 40 which stores at least the first mover 20 and the second mover 30. The first mover 20 includes a magnet 21, and the second mover 30 includes coils 31 and 32 for acting on a magnetic field generated by the magnet 21 and generating electromagnetic force. Each of the elastic bodies 10 includes a fixed region fixed to the case 40, a first support region to which the first mover 20 is fixed, and a second support region to which the second mover 30 is fixed.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to an actuator used as a vibration generating source. [Background technology]

[0002] There are known mobile information terminals and game consoles equipped with haptic devices that generate vibrations that stimulate the user's senses (cutaneous sensations). Haptic devices have vibration actuators that convert input electrical signals into physical movement (vibrations).

[0003] A vibration actuator is composed of, for example, a case, a coil provided in the case, a movable element that vibrates along the vibration axis of the case due to the coil, and a leaf spring whose outer periphery is fixed to the case and whose inner periphery is fixed to the movable element (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2020-196018 Summary of the Invention [Problem to be solved by the invention]

[0005] A vibration actuator is required to generate a variety of vibrations.

[0006] An object of the present invention is to provide a vibration actuator that can generate a variety of vibrations. [Means for solving the problem]

[0007] A vibration actuator according to one embodiment includes a pair of opposing elastic bodies, first and second movers disposed between the pair of elastic bodies and supported by the elastic bodies so as to be independently displaceable, and a case that houses at least the first and second movers. The first mover includes a magnet, and the second mover includes a coil that generates an electromagnetic force by acting on a magnetic field generated by the magnet. Each of the elastic bodies includes a fixed region fixed to the case, a first support region to which the first mover is fixed, and a second support region to which the second mover is fixed. [Effects of the Invention]

[0008] According to the present invention, a vibration actuator capable of generating a variety of vibrations is realized. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an exploded perspective view of a vibration actuator. [Figure 2] FIG. 2 is a cross-sectional view of the vibration actuator. [Figure 3] FIG. 3 is an exploded perspective view of the first mover. [Figure 4] FIG. 4 is an exploded perspective view of the second mover. [Figure 5] FIG. 5 is a plan view of the elastic body. [Figure 6] FIG. 6 is an explanatory diagram showing each region provided on the elastic body. [Figure 7] FIG. 7 is a cross-sectional view showing the support structure for the first and second movers. [Figure 8] FIG. 8 is a plan view showing a modified example of the elastic body. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In all drawings referred to for describing the embodiment, the same or substantially the same configurations and elements will be designated by the same reference numerals. Furthermore, as a general rule, configurations and elements that have already been described will not be described repeatedly.

[0011] <Overall structure> Fig. 1 is an exploded perspective view of a vibration actuator 1A according to this embodiment, and Fig. 2 is a cross-sectional view of the vibration actuator 1A according to this embodiment.

[0012] The vibration actuator 1A includes an elastic body 10, a first mover 20, a second mover 30, a case 40, and a cover 50. At least the first mover 20 and the second mover 30 are housed in the case 40.

[0013] The first mover 20 and the second mover 30 are supported so as to be displaceable by two elastic bodies 10 arranged at both ends of the case 40. More specifically, the first mover 20 and the second mover 30 are displaceable within the case 40 along the center line C of the case 40. The vibration actuator 1A generates vibrations by continuously displacing the two movers (the first mover 20 and the second mover 30) within the case 40.

[0014] In the following description, the center line C of the case 40 may be referred to as the "axis C." Furthermore, unless otherwise specified, the "axial direction" or "vertical direction" in the following description refers to the direction of the center line (axis) C. However, the definition of the vertical direction in this specification is merely for the convenience of explanation. Therefore, the vertical direction in this specification does not necessarily coincide with the vertical direction when the vibration actuator 1A is in use.

[0015] <Cases and covers> The case 40 is formed into a cylindrical shape from a non-magnetic material (e.g., stainless steel). More specifically, the case 40 has a cylindrical peripheral wall portion 41 made of a non-magnetic material and openings 42 and 43 provided at both ends of the peripheral wall portion 41.

[0016] The cover 50 is formed in a disk shape from the same or substantially the same material as the material of the case 40. More specifically, the cover 50 has a circular lid portion 51 and an annular edge portion 52 integrally formed around the periphery of the lid portion 51.

[0017] In the following description, the cover 50 closing the opening 42 of the case 40 may be referred to as the "upper cover 50a," and the cover 50 closing the opening 43 of the case 40 may be referred to as the "lower cover 50b," to distinguish them from one another. Note that there are also embodiments in which the case 40 and the cover 50 are made of a magnetic material, and embodiments in which the case 40 and the cover 50 are made of different materials.

[0018] <Elastic body> Each elastic body 10 is a metal plate punched into a predetermined shape. From another perspective, each elastic body 10 is a leaf spring having a predetermined shape. One of the two elastic bodies 10 is disposed between the case 40 and the upper cover 50a, and covers the opening 42 of the case 40. The other of the two elastic bodies 10 is disposed between the case 40 and the lower cover 50b, and covers the opening 43 of the case 40. From another perspective, the two elastic bodies 10 face each other in the axial direction.

[0019] In the following description, one elastic body 10 disposed between the case 40 and the upper cover 50a may be referred to as the "upper elastic body 11," and the other elastic body 10 disposed between the case 40 and the lower cover 50b may be referred to as the "lower elastic body 12." Details of the elastic bodies 10 (upper elastic body 11 and lower elastic body 12) will be described later.

[0020] <1st mover> 3 is an exploded perspective view of the first movable element 20. The first movable element 20 includes at least a magnet 21, a pair of back yokes 22 and 23, and a shaft 24.

[0021] The magnet 21 is a cylindrical permanent magnet. More specifically, one side of the magnet 21 in the longitudinal direction (axial direction) is magnetized to the north pole, and the other side in the longitudinal direction (axial direction) is magnetized to the south pole. A through-hole 25 is provided at the center of the magnet 21, passing through the magnet 21 in the axial direction.

[0022] The back yokes 22 and 23 are formed of a magnetic material. Each of the back yokes 22 and 23 has a bottom surface 26a facing the end surface of the magnet 21 and a top surface 26b opposite the bottom surface 26a. More specifically, the back yoke 22 has a bottom surface 26a facing the top end surface 21a of the magnet 21 and a top surface 26b opposite the bottom surface 26a. The back yoke 23 has a bottom surface 26a facing the bottom end surface 21b of the magnet 21 and a top surface 26b opposite the bottom surface 26a. From another perspective, the top surface 26b of the back yoke 22 is provided on the upper elastic body 11 side. The top surface 26b of the back yoke 23 is provided on the lower elastic body 12 side.

[0023] The back yoke 22 is attached to the upper end surface 21a of the magnet 21, and the back yoke 23 is attached to the lower end surface 21b of the magnet 21. More specifically, the bottom surface 26a of the back yoke 22 is bonded to the upper end surface 21a of the magnet 21, and the bottom surface 26a of the back yoke 23 is bonded to the lower end surface 21b of the magnet 21.

[0024] In the following description, the back yoke 22 attached to the upper end surface 21a of the magnet 21 may be referred to as the "upper back yoke 22," and the back yoke 23 attached to the lower end surface 21b of the magnet 21 may be referred to as the "lower back yoke 23." In other words, the upper back yoke 22 and the lower back yoke 23 face each other with the magnet 21 in between.

[0025] <First fixed part> A first fixed portion 27 fixed to the elastic body 10 is provided on each of both axial sides of the first movable element 20. More specifically, a first fixed portion 27 fixed to the elastic body 10 is provided on each of the upper back yoke 22 and the lower back yoke 23. Specifically, a cylindrical first fixed portion 27 fixed to the upper elastic body 11 is integrally formed at the center of the upper back yoke 22. Furthermore, a cylindrical first fixed portion 27 fixed to the lower elastic body 12 is integrally formed at the center of the lower back yoke 23.

[0026] The first fixed portion 27 of the upper back yoke 22 protrudes from the upper surface 26b of the upper back yoke 22 toward the upper elastic body 11 facing the upper surface 26b. The first fixed portion 27 of the lower back yoke 23 protrudes from the upper surface 26b of the lower back yoke 23 toward the lower elastic body 12 facing the upper surface 26b.

[0027] The upper back yoke 22 and the lower back yoke 23 are each provided with a through hole 28 that communicates with the through hole 25 provided in the magnet 21. The shaft 24 is inserted into the communicating through holes 28, 25, 28, and passes through the centers of the upper back yoke 22, the magnet 21, and the lower back yoke 23. As a result, one end (upper end) of the shaft 24 protrudes from the upper back yoke 22, and the other end (lower end) of the shaft 24 protrudes from the lower back yoke 23.

[0028] From another perspective, the back yokes 22 and 23 located at both ends of the first mover 20 in the axial direction are provided with protrusions connected to the elastic body 10, respectively.

[0029] <Second mover> 4 is an exploded perspective view of the second mover 30. The second mover 30 includes at least coils 31 and 32, a bobbin 33, and a weight .

[0030] The bobbin 33 includes a cylindrical body 35, annular flanges 36a and 36b provided on both ends of the body 35, and annular intermediate plates 37a and 37b provided around the body 35. The body 35, flanges 36a and 36b, and intermediate plates 37a and 37b are integrally molded from an insulating material such as synthetic resin.

[0031] Although the flanges 36a, 36b and the intermediate plates 37a, 37b are both annular, the outer diameters of the intermediate plates 37a, 37b are slightly smaller than the outer diameters of the flanges 36a, 36b.

[0032] Coil 31 is provided between flange 36a and intermediate plate 37a, and coil 32 is provided between flange 36b and intermediate plate 37b (see FIG. 2). More specifically, coil 31 is formed by a conductive wire wound around a portion of body 35 between flange 36a and intermediate plate 37a. On the other hand, coil 32 is formed by a conductive wire wound around a portion of body 35 between flange 36b and intermediate plate 37b.

[0033] In the following description, the coil 31 provided between the flange 36a and the intermediate plate 37a may be referred to as the "upper coil 31," and the coil 32 provided between the flange 36b and the intermediate plate 37b may be referred to as the "lower coil 32."

[0034] Weight 34 is an annular metal block having approximately the same inner and outer diameters as coils 31 and 32. Weight 34 is disposed around body portion 35, between upper coil 31 and lower coil 32. More specifically, weight 34 is disposed between intermediate plates 37a and 37b (see FIG. 2).

[0035] As described above, the flange 36a, upper coil 31, intermediate plate 37a, weight 34, intermediate plate 37b, lower coil 32, and flange 36b are arranged coaxially in this order.

[0036] <Second fixed part> Second fixed portions 38 fixed to the elastic body 10 are provided on both axial sides of the second movable element 30. More specifically, second fixed portions 38 fixed to the elastic body 10 are provided on the flanges 36a and 36b. Specifically, three second fixed portions 38 fixed to the upper elastic body 11 are provided on the flange 36a. Furthermore, three second fixed portions 38 fixed to the lower elastic body 12 are provided on the flange 36b.

[0037] Each of the second fixing portions 38 is cylindrical and is molded integrally with the flanges 36a, 36b. Furthermore, the three second fixing portions 38 provided on the flange 36a protrude from an outer surface 39a of the flange 36a (a surface opposite to the inner surface 39b that faces the coil 31) toward the upper elastic body 11 that faces the outer surface 39a. Note that the outer surface 39a of the flange 36a, which is the surface opposite to the inner surface 39b, is provided on the upper elastic body 11 side. Furthermore, the three second fixing portions 38 provided on the flange 36a are arranged at equal intervals along the circumferential direction of the flange 36a.

[0038] The three second fixing portions 38 provided on the flange 36b protrude from an outer surface 39a of the flange 36b (a surface opposite the inner surface 39b that faces the coil 32) toward the lower elastic body 12 that faces the outer surface 39a. The outer surface 39a of the flange 36b, which is the surface opposite the inner surface 39b, is provided on the side of the lower elastic body 12. The three second fixing portions 38 provided on the flange 36b are also arranged at equal intervals along the circumferential direction of the flange 36b.

[0039] From another perspective, the flanges 36a and 36b located at both ends of the second movable element 30 in the axial direction are provided with protrusions connected to the elastic body 10, respectively.

[0040] <Upper elastic body and lower elastic body> Fig. 5 is a plan view of the elastic body 10 (upper elastic body 11, lower elastic body 12). Fig. 6 is an explanatory diagram showing each region provided in the elastic body 10. Note that Fig. 6 shows each region schematically and does not accurately show the shape, size, etc. of each region.

[0041] As shown in FIG. 5, the elastic body 10 has a central portion 13, an annular frame portion 14, and multiple arm portions 15. The central portion 13 is circular and located at the center of the elastic body 10. The annular frame portion 14 is located around the central portion 13 and surrounds it. Each arm portion 15 is located between the central portion 13 and the annular frame portion 14 in the radial direction of the elastic body 10, and connects the central portion 13 and the annular frame portion 14. Note that the "radial direction of the elastic body 10" refers to the radial direction of a circle centered at the center of the elastic body 10.

[0042] A round hole 16 is provided in the center of the central portion 13. Each arm 15 has an arc shape that follows the shape of the annular frame 14, and a rectangular or approximately rectangular extension portion 17 that expands radially outward is provided at the center or approximately the center in the longitudinal direction. The "longitudinal direction of the arm 15" refers to the direction in which the arm 15 extends, and also refers to the circumferential direction of the circle that follows the shape of the annular frame 14.

[0043] <Each region of the elastic body> As shown in Fig. 6, the elastic body 10 is provided with a first support region 61, a second support region 62, a fixing region 63, a first deformation region 71, and a second deformation region 72. In Fig. 6, each region is hatched (with a dot pattern) to clearly indicate the respective regions.

[0044] The first support region 61 is provided in the center of the elastic body 10. More specifically, the first support region 61 is provided in the central portion 13 of the elastic body 10, and surrounds the circular hole 16. In other words, the first support region 61 is an annular region surrounding the circular hole 16.

[0045] The fixing region 63 is provided around the first support region 61 and surrounds the first support region 61. More specifically, the fixing region 63 is provided on the annular frame portion 14 of the elastic body 10 over the entire circumference thereof.

[0046] The second support region 62 is provided between the first support region 61 and the fixed region 63 in the radial direction of the elastic body 10. More specifically, the second support region 62 is provided in each of the extension portions 17 of the three arms 15. In other words, three second support regions 62 are provided in the elastic body 10.

[0047] The first deformation region 71 is interposed between the second support region 62 and the first support region 61. On the other hand, the second deformation region 72 is interposed between the second support region 62 and the fixing region 63. In other words, the first deformation region 71 is disposed on one side of the second support region 62, and the second deformation region 72 is disposed on the other side of the second support region 62.

[0048] The first deformation region 71 and the second deformation region 72 are provided on each of the three arms 15. More specifically, the first deformation region 71 is provided on one part of the arm 15 in the longitudinal direction, and the second deformation region 72 is provided on another part of the arm 15 in the longitudinal direction.

[0049] From another perspective, the first deformation region 71 is formed by one section of the arm portion 15, and the second deformation region 72 is formed by another section of the arm portion 15. More specifically, the first deformation region 71 is formed by the section from the end of the arm portion 15 on the central portion 13 side to the expansion portion 17. Furthermore, the second deformation region 72 is formed by the section from the end of the arm portion 15 on the annular frame portion 14 side to the expansion portion 17. As a result, the second support region 62 provided in the expansion portion 17 is located between the first deformation region 71 and the second deformation region 72 in the longitudinal direction of the arm portion 15.

[0050] <Elastic body fixing structure> The elastic body 10 is fixed to the case 40. Specifically, the annular frame portion 14 of the elastic body 10 is sandwiched between the case 40 and the cover 50, as shown in FIG.

[0051] More specifically, the annular frame 14 of the upper elastic body 11 is sandwiched between the upper end of the peripheral wall 41 of the case 40 and the edge 52 of the upper cover 50a. Also, the annular frame 14 of the lower elastic body 12 is sandwiched between the lower end of the peripheral wall 41 of the case 40 and the edge 52 of the lower cover 50b.

[0052] From another perspective, the fixing region 63 (FIG. 6) of the upper elastic body 11 and the lower elastic body 12 is sandwiched between the case 40 and the cover 50. In other words, the fixing region 63 is the region of the annular frame portion 14 (FIG. 5) of the elastic body 10 that is sandwiched between the case 40 and the cover 50.

[0053] The first mover 20 and the second mover 30 are disposed between a pair of elastic bodies 10 fixed to both ends of the case 40 as described above, and are supported by these elastic bodies 10 so as to be able to displace independently. As already mentioned, the displacement direction of the first mover 20 and the second mover 30 is the axial direction.

[0054] 7 is a cross-sectional view showing the support structure for the first mover 20 and the second mover 30. The support structure for the first mover 20 and the second mover 30 will be described below mainly with reference to FIGS.

[0055] <Support structure of the first mover> A first fixed portion 27 provided on the back yokes 22, 23 of the first movable element 20 is fixed to the central portion 13 of the elastic body 10. Specifically, the first fixed portion 27 of the upper back yoke 22 is fixed to the central portion 13 of the upper elastic body 11. In addition, the first fixed portion 27 of the lower back yoke 23 is fixed to the central portion 13 of the lower elastic body 12.

[0056] From another perspective, the end face of the first fixed portion 27 of the upper back yoke 22 is joined to the first support region 61 of the upper elastic body 11. Also, the end face of the first fixed portion 27 of the lower back yoke 23 is joined to the first support region 61 of the lower elastic body 12. In other words, the first support region 61 is the region of the central portion 13 of the elastic body 10 to which the end face of the first fixed portion 27 is joined.

[0057] The upper end of the shaft 24 is inserted into the round hole 16 of the upper elastic body 11, and the lower end of the shaft 24 is inserted into the round hole 16 of the lower elastic body 12. However, there are also embodiments in which the end of the shaft 24 is not inserted into the round hole 16. Furthermore, there are also embodiments in which the shaft 24 is omitted.

[0058] <Support structure for second mover> The second fixed portions 38 provided on the flanges 36a and 36b of the second movable element 30 are fixed to the arm portions 15 of the elastic body 10. Specifically, the three second fixed portions 38 of the flange 36a are fixed to the three arm portions 15 of the upper elastic body 11, respectively. In addition, the three second fixed portions 38 of the flange 36b are fixed to the three arm portions 15 of the lower elastic body 12, respectively.

[0059] From another perspective, the end faces of the second fixing portions 38 of the flange 36a are joined to the second support regions 62 of the upper elastic body 11. Furthermore, the end faces of the second fixing portions 38 of the flange 36b are joined to the second support regions 62 of the lower elastic body 12. In other words, the second support regions 62 are regions of the arms 15 (extension portions 17) of the elastic body 10 to which the end faces of the second fixing portions 38 are joined.

[0060] <Operation> Next, the basic operation of the vibration actuator 1A will be described. When no current (drive current) flows through the coils 31 and 32 of the second movable element 30, the first movable element 20 and the second movable element 30 are located at the center of the case 40 in the axial direction (initial position).

[0061] When a drive current flows through the coils 31 and 32 provided in the second movable element 30, an electromagnetic force acts on the coils 31 and 32 in response to a magnetic field generated by the magnet 21 constituting the first movable element 20. As a result, a thrust acts on the first movable element 20 and the second movable element 30.

[0062] A driving current flows through the coils 31 and 32 in a direction that alternately generates electromagnetic forces in opposite directions. When a driving current flows through the coils 31 and 32 in a first direction, a downward thrust acts on the first mover 20, and an upward thrust acts on the second mover 30. On the other hand, when a driving current flows through the coils 31 and 32 in a second direction (opposite to the first direction), an upward thrust acts on the first mover 20, and a downward thrust acts on the second mover 30.

[0063] Therefore, as the direction of the drive current alternates, the first mover 20 and the second mover 30 are continuously displaced within the case 40, generating vibration.

[0064] Here, the vibration actuator 1A is provided with a first vibration system including a first movable element 20 fixed to a case 40 via an elastic body 10, and a second vibration system including a second movable element 30 fixed to a case 40 via an elastic body 10.

[0065] Furthermore, the first vibration system includes a deformation region of the elastic body 10. Specifically, the first vibration system includes a first deformation region 71 and a second deformation region 72 that are interposed between a first support region 61 to which the first movable element 20 is fixed and a fixed region 63 to which the first movable element 20 is fixed to the case 40.

[0066] The second vibration system also includes a deformation region of the elastic body 10. Specifically, the second vibration system includes a second deformation region 72 that is interposed between a second support region 62 to which the second movable element 30 is fixed and a fixed region 63 to which the second movable element 30 is fixed to the case 40.

[0067] As a result, the first vibration system has a natural frequency f1 determined by the spring constants of the first deformation region 71 and the second deformation region 72 and the mass of the first movable element 20. On the other hand, the second vibration system has a natural frequency f2 (≠ natural frequency f1) determined by the spring constant of the second deformation region 72 and the mass of the second movable element 30.

[0068] Therefore, by driving the first vibration system at or near the natural frequency f1, it is possible to generate resonance in the first vibration system, and by driving the second vibration system at or near the natural frequency f2, it is possible to generate resonance in the second vibration system.

[0069] In other words, vibration actuator 1A can generate strong vibrations (large vibrations) by being driven at two different frequencies. Moreover, because it uses a resonance phenomenon to generate vibrations, it can generate strong vibrations (large vibrations) with little power consumption. From another perspective, vibration actuator 1A has at least two resonance points, and can generate a variety of vibrations with little power consumption.

[0070] <Modification of Elastic Body> A modified example of the elastic body 10 is shown in Figure 8. The elastic body 101 shown in Figure 8 has the same basic configuration as the elastic body 10 shown in Figures 5 and 6. Specifically, the elastic body 101 has a central portion 13, an annular frame portion 14, and a plurality of arms 15. However, the elastic body 101 also has two first arms 15a connecting the central portion 13 and the annular frame portion 14, and two second arms 15b one end of which is connected to the annular frame portion 14. From another perspective, the arms 15 of the elastic body 101 include two arms 15b that are cantilevered.

[0071] Like the elastic body 10, the elastic body 101 has a second support region 62, a first deformation region 71, and a second deformation region 72 provided on the arm portion 15. However, in the elastic body 101, a circular or approximately circular extension portion 17 is formed at the tip of each second arm portion 15b, and the second support region 62 is provided on this extension portion 17.

[0072] The first deformation region 71 of the elastic body 101 is provided on the first arm portion 15a and is interposed between the fixing region 63 and the first support region 61. The second deformation region 72 of the elastic body 101 is provided on the second arm portion 15b and is interposed between the fixing region 63 and the second support region 62. In other words, in the elastic body 101, the first deformation region 71 and the second deformation region 72 are provided on different arms 15.

[0073] As described above, the elastic body 101 has several features that differ from the elastic body 10. However, the elastic body 101 has the same basic functions as the elastic body 10. That is, like the elastic body 10, the elastic body 101 can support the first movable element 20 and the second movable element 30 so that they can be displaced. Therefore, the elastic body 101 can replace the upper elastic body 11 and the lower elastic body 12 in the above embodiments, and achieves the same effects as those of the upper elastic body 11 and the lower elastic body 12.

[0074] The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the spirit of the present invention. For example, the elastic body is not limited to the elastic body 10 shown in FIGS. 5 and 6, or the elastic body 101 shown in FIG. 8. The shape, size, material, etc. of the elastic body can be appropriately modified as needed. The shape, size, arrangement, etc. of each region provided on the elastic body can also be appropriately modified as needed. The number of second fixing portions is not limited to three, and may be any number. [Explanation of symbols]

[0075] 1A... vibration actuator, 10, 101... elastic body, 11... upper elastic body, 12... lower elastic body, 13... central portion, 14... annular frame portion, 15... arm portion, 15a... first arm portion, 15b... second arm portion, 16... round hole, 17... extension portion, 20... first movable element, 21... magnet, 21a... upper end surface, 21b... lower end surface, 22... back yoke (upper back yoke), 23... back yoke (lower back yoke), 24... shaft, 25... through hole, 26a... bottom surface, 26b... upper surface, 27... first fixed portion, 28... through hole, 30... second movable element, 31... Coil (upper coil), 32...coil (lower coil), 33...bobbin, 34...weight, 35...body portion, 36a, 36b...flanges, 37a, 37b...intermediate plate, 38...second fixing portion, 39a...outer surface, 39b...inner surface, 40...case, 41...peripheral wall portion, 42, 43...opening, 50...cover, 50a...upper cover, 50b...lower cover, 51...lid portion, 52...edge portion, 61...first support region, 62...second support region, 63...fixing region, 71...first deformation region, 72...second deformation region, C...center line (axis line), f1, f2...natural frequency

Claims

1. A pair of opposing elastic bodies; a first mover and a second mover that are disposed between the pair of elastic bodies and supported by the elastic bodies so as to be independently displaceable; a case that accommodates at least the first mover and the second mover, the first movable element includes a magnet, a pair of back yokes facing each other with the magnet in between, and a shaft passing through the centers of the magnet and the back yoke, the second mover includes a coil that acts on a magnetic field generated by the magnet to generate an electromagnetic force, each of the elastic bodies includes a fixed region fixed to the case, a first support region to which the first movable element is fixed, and a second support region to which the second movable element is fixed; A vibration actuator, wherein each of the back yokes is provided with a first fixed portion that is fixed to the first support region of the elastic body.

2. Each of the back yokes has a bottom surface facing an end surface of the magnet and an upper surface opposite to the bottom surface, The vibration actuator according to claim 1 , wherein the first fixed portion protrudes from the upper surface toward the elastic body that faces the upper surface.

3. the second armature further includes a bobbin having a pair of flanges facing each other with the coil interposed therebetween, 3. The vibration actuator according to claim 1, wherein each of the flanges is provided with a second fixing portion that is fixed to the second support region of the elastic body.

4. Each of the flanges has an inner surface facing the coil and an outer surface opposite the inner surface, The vibration actuator according to claim 3 , wherein the second fixing portion protrudes from the outer surface toward the elastic body that faces the outer surface.

5. 5. The vibration actuator according to claim 3, wherein each of the flanges is provided with a plurality of the second fixing portions arranged at equal intervals along the circumferential direction of the flange.

6. 6. The vibration actuator according to claim 3, wherein the second movable element further includes two of the coils and a weight disposed between the two coils.

7. the first support region of the elastic body is provided at the center of the elastic body, the fixing region of the elastic body is provided around the first support region and surrounds the first support region; The vibration actuator according to any one of claims 1 to 6, wherein the second support region of the elastic body is provided between the first support region and the fixed region in the radial direction of the elastic body.

8. 8. The vibration actuator according to claim 7, wherein the elastic body further includes a first deformation region interposed between the second support region and the first support region, and a second deformation region interposed between the second support region and the fixed region.

9. the elastic body includes a central portion, an annular frame portion surrounding the central portion, and arm portions connecting the central portion and the annular frame portion, The first support region is provided in the central portion, The fixing region is provided in the annular frame portion, the arm portion is provided with the second support region, the first deformation region, and the second deformation region, 9. The vibration actuator according to claim 8, wherein the second support region is provided between the first deformation region and the second deformation region in the longitudinal direction of the arm portion.

10. 8. The vibration actuator according to claim 7, wherein the elastic body further includes a first deformation region interposed between the fixed region and the first support region, and a second deformation region interposed between the fixed region and the second support region.

11. the elastic body includes a central portion, an annular frame portion surrounding the central portion, a first arm portion connecting the central portion and the annular frame portion, and a second arm portion having one end connected to the annular frame portion, The first support region is provided in the central portion, The fixing region is provided in the annular frame portion, The first arm portion is provided with the first deformation region, the second arm portion is provided with the second support region and the second deformation region, The vibration actuator according to claim 10 , wherein the second support region is provided at a tip of the second arm portion.

Images