Vibration actuator and vibration presentation device

Abstract

To provide a vibration actuator and a vibration presentation device which have overall device thinness ensured and stably vibrate with high output.SOLUTION: A vibration actuator includes: a fixed part including a magnetic force generation part in which a plate-shaped magnetic core is inserted to a coil and both ends of the magnetic core protrude from the coil, and a base part to which the magnetic force generation part is fixed in a state where both ends overlap the top surface thereof; a movable part including plate-shaped magnetic members which face both ends from above in a direction perpendicular to the top surface, and a weight portion which is arranged on the underside of the magnetic member at a position avoiding the magnetic force generation part; and an elastic body being a frame-shaped body which has a first opposite side and a second opposite side surrounding the movable part, and in which a pair of first connection parts of the first opposite side is connected to the movable part, and a pair of second connection parts of the second opposite side is connected to the fixed part. The vibration actuator vibrates when the movable part is displaced so as to approach the fixed part with magnetic force generated through electric conduction to the coil.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a vibration actuator and a vibration presentation device including the same. [Background technology]

[0002] Various configurations are known, for example from Patent Documents 1 and 2, that impart vibrations generated by an electromagnetic mechanism as a tactile sensation or operational sensation (hereinafter, these are collectively referred to as "tactile sensation") to the pads of an operator's fingers that come into contact with an operation panel such as a touch panel (hereinafter, simply referred to as "panel").

[0003] The vibration actuator described in Patent Document 1 has a guide shaft arranged perpendicular to the panel surface, a movable magnet and a fixed coil arranged on the inside and outside of the shaft in the radial direction, and the movable magnet is moved back and forth along the guide shaft. Therefore, the device itself needs to have a certain height.

[0004] The vibration actuator (vibration presentation device) described in Patent Document 2 has a center yoke arranged perpendicular to the panel surface, and a movable coil and a fixed magnet arranged on the inside and outside in the radial direction of the shaft. In addition, a support part that supports the panel is arranged by surrounding the outer periphery with a vertical wall, and the movable coil is moved back and forth along the center yoke inside the support part. Therefore, this device itself needs to be at least a certain height. Furthermore, the vibration actuators described in Patent Documents 1 and 2 use magnets (permanent magnets), which poses problems in terms of manufacturing cost and ease of manufacturing. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2015-070729 A [Patent Document 2] JP 2016-163854 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is a demand for the above-mentioned conventional vibration actuator to be made even smaller and thinner. In addition, since there is a demand for higher output than in conventional vibration actuators, in Patent Document 2, the coil is arranged on the moving part side, increasing the weight of the moving part and making it possible to increase output, but the wiring must be routed so as not to interfere with each other, which also poses issues in terms of ease of manufacture.

[0007] An object of the present invention is to provide a vibration actuator and a vibration presentation device that ensures a thin overall device and that vibrates stably with high output. [Means for solving the problem]

[0008] The vibration actuator of the present invention comprises: a fixing part including a magnetic force generating part in which a plate-shaped magnetic core is inserted into a coil so that both ends of the magnetic core protrude from the coil, and a base part on which the magnetic force generating part is fixed with both ends overlapping each other; a movable portion including a plate-shaped magnetic member facing both ends from above in a direction perpendicular to the upper surface, and a weight portion disposed on a lower surface of the magnetic member at a position avoiding the magnetic force generating portion; a frame-shaped body having a first opposite side and a second opposite side surrounding the movable part, the frame-shaped body being connected to the movable part at a pair of first connecting portions of the first opposite side and connected to the fixed part at a pair of second connecting portions of the second opposite side; having The movable part is displaced and vibrates so as to approach the fixed part due to a magnetic force generated by energizing the coil.

[0009] The vibration presentation device of the present invention is a vibration presentation device in which a vibration actuator having the above-mentioned configuration is disposed on a back surface of an operation surface, The touch panel is configured such that, in response to a user's touch on the operation surface, a current is passed through the coil, and the movable part is displaced so as to approach the fixed part, thereby presenting a vibration. Effect of the Invention

[0010] According to the present invention, the thinness of the entire device can be ensured, and stable vibration with high output can be achieved. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an external perspective view of a vibration actuator according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a bottom view of the vibration actuator. [Diagram 3] FIG. 3 is an exploded perspective view showing the configuration of the main part of the vibration actuator. [Figure 4] FIG. 4 is an exploded perspective view of the vibration actuator. [Diagram 5] FIG. 5 is a perspective view of the core body of the vibration actuator as viewed from below. [Figure 6] FIG. 6 is an exploded perspective view of the core body. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. [Figure 8] FIG. 8 is a cross-sectional view taken along line BB in FIG. [Figure 9] FIG. 9 is a diagram illustrating a magnetic circuit of the vibration actuator. [Figure 10] FIG. 10 is a diagram showing the circuit configuration of a control unit of the vibration actuator. [Figure 11] FIG. 11 is an external perspective view of a vibration actuator according to a second embodiment of the present invention. [Figure 12] FIG. 12 is a bottom view of the vibration actuator. [Figure 13] FIG. 13 is an exploded perspective view showing the configuration of the main part of the vibration actuator. [Figure 14] FIG. 14 is an exploded perspective view of the vibration actuator. [Figure 15] FIG. 15 is a perspective view of the core body of the vibration actuator as viewed from below. [Figure 16]FIG. 16 is an exploded perspective view of the core body. [Figure 17] FIG. 17 is a cross-sectional view taken along line CC in FIG. [Figure 18] FIG. 18 is a cross-sectional view taken along line DD in FIG. [Figure 19] FIG. 19 is a diagram showing an example of a vibration presentation device having a vibration actuator. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, an apparatus according to an embodiment of the present invention will be described with reference to the drawings.

[0013] In each embodiment described below, a Cartesian coordinate system (X, Y, Z) is used. The lengths of the X, Y, and Z directions are described as corresponding to the width (left-right direction, long direction), depth (front-back direction, short direction), and height (up-down direction) of the vibration actuator and the vibration presentation device. However, it goes without saying that these correspondences differ depending on the usage manner of the vibration actuator and the vibration presentation device. Regarding the Z direction, the positive side of the Z direction (upper side) is the direction in which vibration feedback is given to the operator, and the negative side of the Z direction (lower side) is the direction in which the operator presses when operating.

[0014] In addition, the expressions regarding shapes used in the description of each embodiment are convenient expressions to facilitate understanding of the content, and the shapes adopted in each embodiment are themselves examples and can be implemented with various modifications.

[0015] (Embodiment 1) FIG. 1 is an external perspective view of a vibration actuator according to a first embodiment of the present invention, and FIG. 2 is a bottom view of the vibration actuator. FIG. 3 is an exploded view showing the main configuration of the vibration actuator. FIG. 4 is an exploded perspective view of the vibration actuator. FIG. 5 is a perspective view of a core body of the vibration actuator as viewed from below. FIG. 6 is an exploded perspective view of the core body. FIG. 7 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 8 is a cross-sectional view taken along line BB in FIG. 1.

[0016] The vibration actuator 1 according to this embodiment has a fixed part 10, an elastic support part 40 and a movable part 60.

[0017] <Fixed part 10> The fixed portion 10 has a base portion 30 and a magnetic force generating portion 20 which is an electromagnet.

[0018] <Base part 30> The base portion 30 is a member that supports the entire vibration actuator 1 and is used to attach the vibration actuator 1 to a housing (not shown) of a vibration presentation device. The base portion 30 supports the movable portion 60 via the elastic support portion 40 so that the movable portion 60 can move freely in the thickness direction (Z direction) of the vibration actuator 1, as shown in Figures 1 to 4, 7 and 8.

[0019] The base portion 30 is made of a non-magnetic material (sheet metal) such as austenitic SUS. The base portion 30 is, for example, a flat plate having a predetermined thickness in the Z direction and is disposed along the XY plane, which allows the vibration actuator 1 as a whole to be made thinner. The base portion 30 is disposed so as to sandwich the elastic support portion 40 in the thickness direction together with the magnetic body 60. Note that on the base portion 30, the elastic support portion 40 and the magnetic force generating portion 20 (specifically, the core 22 of the magnetic force generating portion 20) are disposed in the same layer.

[0020] The base portion 30 has a rectangular base portion main body 31, and a base opening 38 is provided in the center of the base portion main body 31. A part of the coil of the magnetic force generating unit 20 fixed to the base portion 30 is disposed in the base opening 38. This allows a part of the height of the magnetic force generating unit 20 to be absorbed by the plate thickness of the base portion 30, and the vibration actuator 1 as a whole can be made thinner.

[0021] Further, a wiring opening 39 is formed in the base body 31 adjacent to the base opening 38. When the magnetic force generating unit 20 is fixed to the base body 30, the substrate 25 disposed on the magnetic force generating unit 20 is disposed in the wiring opening 39. This allows a part of the height of the magnetic force generating unit 20 to be absorbed by the plate thickness of the base body 30. Further, a recess 33 is formed on the rear surface of the base body 31, which is recessed on the rear surface side and continues to the wiring opening 39. An extension portion 28, which is a substrate connected to the substrate 25 and led out to the outside of the base body 31, is disposed in the recess 33. This prevents the thickness of the extension portion 28 from increasing the thickness of the vibration actuator 1 itself.

[0022] In addition, the base body 31 has a pair of parallel sides (sides along the Y direction) provided with concave cutouts 312, 314 that open outward (outside in the X direction). In the cutouts 312, 314, the movable part side connecting parts (a pair of first connecting parts) 441, 442 are arranged so as to be displaceable in the Z direction. The cutouts 312, 314 allow the movable part side connecting parts 441, 442 to be displaced even if the movable part side connecting parts 441, 442 are arranged in a layer of the base body 30. As a result, the corners of the base body have projections 316, 318 that protrude in the X direction, respectively. In addition, the base body 30 has base connecting parts 321, 322 provided in another pair of parallel sides (sides along the X direction) adjacent to each pair of parallel sides.

[0023] The base connection parts (protruding connection parts) 321, 322 are located outside the core ends 221, 222 (both ends) to which the magnetic force generating unit 20 is fixed, and protrude outward (here, in the Y direction, the extension direction of the magnetic force generating unit 20). The base connection parts 321, 322 are provided protruding from the outer periphery of the base body 31. The base connection parts 321, 322 are formed thinner than the thickness of the base body 31, and function as a countersink for a fastening member 35 such as a rivet on the back surface of the base connection part 321. In addition, a concave countersink 34 for the fastening member 35 is formed on the back surface of the base connection part 322. The base body 31 is formed in a square frame shape in a plan view by a pair of adjacent parallel sides and another pair of parallel sides, and the degree of freedom in the direction when the housing is attached can be ensured.

[0024] <Magnetic force generating unit (electromagnet) 20> As shown in FIGS. 3 to 6, the magnetic force generating unit 20 has a coil 50, a plate-shaped core 22 around which the coil 50 is mounted, and a substrate unit 25 connected to the coil 50. The magnetic force generating unit 20 is an electromagnet that generates a magnetic force by exciting the core 22 when a current is passed through the coil 50 , and is fixed to the base unit 30 .

[0025] Coil 50 is disposed on the outer periphery of the central portion of core 22, which has a flat rectangular plate shape, so as to surround the central portion via insulating film portion 27. Coil 50 is disposed in a state in which insulating film portion 27 makes it difficult for coil 50 to come into direct contact with core 22. Note that insulating film portion 27 is fixed to core 22 via adhesive 241, such as a thermosetting resin.

[0026] Core (magnetic core) 22 is a rectangular plate-like magnetic body, and is formed in a band shape having core ends 221, 222 protruding from coil 50 arranged in the center in the axial direction of coil 50. When coil 50 is energized, core ends 221, 222 of core 22 are excited to generate magnetic force. In addition, in this embodiment, core 22 is a rectangular plate, so that high dimensional accuracy can be maintained, and cutting and other processing can be easily performed during manufacturing.

[0027] The core 22 is preferably formed of a soft magnetic material such as a silicon steel plate, permalloy, ferrite, etc. The core 22 may also be made of electromagnetic stainless steel, a sintered material, a MIM (metal injection molding) material, a laminated steel plate, an electrolytic galvanized steel plate (SECC), etc.

[0028] The core 22 is fixed onto the base body 31 with the coil 50 positioned within the base opening 38 relative to the base body 31 .

[0029] Specifically, the lower surfaces (rear surfaces) of the core ends 221, 222 are placed on the base body 31, and the surfaces (all or part of the surfaces exposed on the upper side) of the core ends 221, 222 face the movable core 70 of the movable part 60.

[0030] Core 22 is excited by energizing coil 50, and generates a magnetic force (magnetic attraction force) between the upper surfaces of core ends 221, 222 and movable core 70 located in a direction perpendicular to the upper surface (plane perpendicular direction). The plane perpendicular direction is also called the facing direction, or in other words, the up-down direction (Z direction).

[0031] The substrate 25 is connected to the coil 50 and supplies power to the coil 50. The substrate 25 is attached to the core 22 via an adhesive such as an adhesive or double-sided tape 252. In addition, the substrate 25 is disposed on the back surface of the core 22 at a position that avoids the coil 50 and the upper surface that becomes the magnetic pole surface with respect to the base body 31. The substrate 25 is formed in a shape that is hidden by the core 22 itself in a plan view. The substrate 25 has a wiring portion that is connected to the extension 28, and the coil 50 and an external device are electrically connected via the wiring portion.

[0032] In the substrate portion 25, the wiring portion is provided in a state in which the core 22 and the coil 50 are insulated, and has a coil wiring land portion connected to the coil wire 52 at the end of the coil 50 via a fillet 254, and an external connection land portion connected to an external device. The external connection land portion is arranged next to the coil wiring land portion, and is connected to the extension portion 28 which is a derived substrate arranged on the lower surface of the base portion 30.

[0033] The substrate section 25 is, for example, a flexible substrate, and may be made up of multiple layers. For example, the insulating layer is made of a flexible material having insulating properties such as polyimide, and a coil wiring land section and an external connection land section are provided on the insulated wiring section.

[0034] <Movable part 60> The movable part 60 is movable in the up and down direction (plate thickness direction) relative to the fixed part 10. The movable part 60 has a movable core 70 and a weight part 80.

[0035] <Movable core (plate-shaped magnetic member) 70> The movable core 70 receives a magnetic force (magnetic attractive force) from the fixed portion 10 (magnetic force generating portion 20) and also receives an elastic force from the elastic support portion 40, and performs an oscillatory motion and has a function of generating vibrations.

[0036] When the vibration actuator 1 is applied to a vibration presentation device, the movable core 70 is arranged in contact with or connected to a vibration presentation unit (typically an operation panel such as a touch panel or a touch pad) and can output its own vibration to the vibration presentation unit. This allows the movable core 70 to provide tactile feedback to an operator who operates the vibration presentation unit.

[0037] The movable core 70 is made of a magnetic material, such as electrolytic galvanized steel sheet (SECC), electromagnetic stainless steel, sintered material, MIM (metal injection molding) material, laminated steel sheet, etc.

[0038] The movable core 70 is a frame-shaped member having an opening (opening 72) in the area of ​​the coil 50, and a part of the coil 50 is disposed within the opening 72.

[0039] The movable core 70 has opposing surfaces 702 and 704 that face the core ends 221 and 222 of the core 22 of the magnetic force generating unit 20 .

[0040] The opposing surfaces 702, 704 are provided on the lower surface of the movable core 70 and are positioned apart from the upper surfaces of the core ends 221, 222 by the length of the gap G in a direction perpendicular to the surface (a direction perpendicular to the axial direction of the coil 50).

[0041] When current is applied to the coil 50, a magnetic attraction force is generated between the opposing surfaces 702, 704 and the core ends 221, 222 of the core 22, and the opposing surfaces 702, 704 are attracted to the core ends 221, 222. That is, the movable core 70 approaches the core 22 within the gap G in the direction perpendicular to the surface (Z direction).

[0042] The opposing surfaces 702, 704 are formed in the movable core 70 at symmetrical positions spaced apart from the center of the movable core 70 in the Y direction and at the center in the X direction, with the central opening 72 of the movable core 70 in between.

[0043] Since the opposing surfaces 702 and 704 are surfaces that completely face the core ends 221 and 222 , magnetic flux can flow between the core ends 221 and 222 efficiently.

[0044] The movable core 70 has a weight section 80 fixed via a weight fixing section 77 at a position on the lower surface thereof that does not overlap in the vertical direction with the magnetic force generating section 20 including the coil 50 .

[0045] In the movable core 70, a portion of the coil 50 is disposed in the opening 72, so there is no need to support the movable core 70 at a high position where it does not interfere with the coil 50, and the movable part 60 including the movable core 70 can be disposed in a position close to the core 22 around which the coil 50 is wound. In addition, the movable core 70 is flat and disposed along the XY plane, which allows the entire vibration actuator 1 to be made thinner.

[0046] The movable core 70 can be made thicker and / or made of a material with a large specific gravity, thereby increasing the movable weight and achieving higher output vibration.

[0047] <Weight 80> Weight section 80 shown in Figs. 4, 7 and 8 has the function of increasing the weight of movable section 60 and promoting vibration.

[0048] In the vibration actuator 1, the weight portion 80 is fixed to the movable core 70 between the elastic support portion 40 and the magnetic force generating portion 20, and between the base portion 30 and the movable core 70, so as not to hinder movement of the movable portion 60 in the thickness direction (Z direction) due to deformation of the elastic support portion.

[0049] The weight portion 80 is a plate-like body, and has a plurality of weight pieces 82, 84. The weight pieces 82, 84 are members formed in the same shape, for example, which reduces the manufacturing cost.

[0050] The weights 82, 84 are arranged, in plan view, inside the frame-shaped elastic support part 40 and on both sides of the magnetic force generating part 20 along the Y direction so as not to interfere with the up and down movement of the movable part 60 and the elastic support part 40. The weights 82, 84 have a shape corresponding to the dead space between the elastic support part 40 and the magnetic force generating part 20 (core 22 and coil 50) where they do not interfere when the movable part 60 moves, and are arranged in that space.

[0051] That is, the weights 82, 84 are disposed between the base portion 30 and the movable core 70, and inside the frame-shaped main body 46 of the elastic support portion 40 at positions avoiding the magnetic force generating portion 20, and are connected to the lower surface of the movable core 70. The weights 82, 84 are elongated plate-like extending in the Y direction here, and have a shape corresponding to one opposing side of the frame-shaped portion of the movable core 70. The weights 82, 84 are fixed to the weight fixing portion 77 of the movable core 70 via the core-side connection parts 821, 841 provided at both ends of the elongated length, sandwiching the spring-side connection parts 822, 842 therebetween.

[0052] The weights 82, 84 are fixed at their respective centers to the movable part side connecting parts 441, 442 of the elastic support part 40, and can move freely up and down inside the elastic support part 40 together with the movable part side connecting parts 441, 442 as the movable part side connecting parts 441, 442 are displaced.

[0053] That is, the weights 82, 84 are disposed in a layer between the layer of the elastic support part 40 and the layer of the movable core 70, and connect the elastic support part 40 and the movable core 70 in the Z direction, i.e., in the up-down direction. In this manner, the multiple weights 82, 84 are fixed on the pair of movable part side connecting parts 441, 442, respectively, and the movable core 70 is bridged and connected on the upper surfaces of the weights 82, 84.

[0054] The weight of the weights 82, 84 can be set arbitrarily, and for example, each adjustment can be made within the XY region between the elastic support unit 40 and the magnetic force generating unit 20 by adjusting the length of the weights 82, 84 in the Y direction, adjusting the length in the Z direction, adjusting the material, etc. In particular, when increasing the weight of the movable part, the vibration output can be increased by increasing the thickness of the weights 82, 84, i.e., the length in the Z direction, or by using a material with a high specific gravity to achieve a suitable weight. Furthermore, the weight of the movable part 60 of the weight unit 80 can be adjusted, and the natural frequency can be set by this adjustment.

[0055] In this embodiment, the weights 82, 84 and movable core 70 that constitute the movable part 60 are connected to the elastic support part 40 via the weight part 80. The weights 82, 84 and movable core 70 are fixed to the base part 30 via the elastic support part 40 at base connection parts 321, 322 adjacent to the magnetic force generating part 20, with the thickness (length in the Z direction) of the coil 50 absorbed by the opening 72. This allows the vibration actuator 1 itself to be adjusted to vibrate with high output while being made low-profile.

[0056] <Elastic support portion (elastic body) 40> The elastic support part 40 has an elastically deformable function, and is connected to the fixed part 10 and the movable part 60. The elastic support part 40 elastically supports the movable part 60, which moves in the vertical direction upon receiving a magnetic force from the fixed part 10. The elastic support part 40 is a frame-shaped body having a shape surrounding the movable part 60.

[0057] The elastic support part 40 is a frame-shaped leaf spring having a predetermined thickness (length in the Z direction), and supports the movable part 60 relative to the base part 30 so as to be freely movable in the up and down direction (Z direction).

[0058] The elastic support part 40 is a frame-shaped body arranged so as to surround the base part 30, and has a frame-shaped main body 46 arranged outside the base part 30 and deformable in the Z direction. The elastic support part 40 is interposed in a layered manner between the base part 30 and the movable part 60 in the thickness direction (Z direction).

[0059] The elastic support portion 40 connects the plate-shaped movable portion 60 (specifically, weight pieces 82, 84) and the plate-shaped base portion 30 in a state in which they are separated by the thickness of the elastic support portion 40, that is, in a state in which a gap G (see FIGS. 7 and 8) is provided. The elastic support portion 40 has a pair of sides (the other opposite sides) 461 that are parallel to each other, and another pair of sides (one opposite side) 462 that are adjacent to the pair of sides 461 and face each other. The pair of sides 461 and the other pair of sides 462 have the same length, and the frame-shaped main body 46 is a square frame body.

[0060] The elastic support part 40 has fixed part side connecting parts (a pair of second connecting parts) 421, 422 provided at the center of each of a pair of side parts 461 of the frame-shaped main body 46. The elastic support part 40 is connected to the base part 30 by fastening the fixed part side connecting parts 421, 422 to the base connecting parts 321, 322 of the base part main body 31 via fastening members 35 such as rivets. Note that the fixed part side connecting parts 421, 422 and the base connecting parts 321, 322 may be joined by crimping, welding, or the like other than fastening with the fastening members 35.

[0061] The fixed portion side connection portions 421, 422 are fixed onto the base connection portions 321, 322 that protrude outward from the base portion main body 31, thereby partially connecting the frame-shaped main body 46 to the base portion main body 31 and being arranged to surround the base portion main body 31.

[0062] In the frame-shaped main body 46, a pair of sides 461 protrude from the fixed-part side connecting parts 421, 422 on the base connecting parts 321, 322 along one side (side along the X direction), and the other pair of sides 462 are connected so as to bend and extend along the Y direction. The sides 461, 462 are disposed on the outside of the base main body 31 so as to surround the overhanging parts 316, 318.

[0063] Further, flat movable part side connecting parts 441, 442 are provided inwardly protruding from the center of the other pair of sides 462. The spring side connecting parts 822, 842 of the weight pieces 82, 84 are fixed to the movable part side connecting parts 441, 442 with the spring side connecting parts 822, 842 placed on the upper surfaces of the movable part side connecting parts 441, 442.

[0064] The movable part side connection parts 441, 442 and the spring side connection parts 822, 842 may be fixed using fastening members such as screws or bolts, adhesives, etc., but they may also be fixed by joining the two parts via recesses and protrusions on both parts that have shapes that allow them to fit together.

[0065] The elastic support part 40 is connected so as to suspend the movable part 60 at a pair of movable part side connecting parts 441, 442 that protrude inward from a pair of sides (opposite sides) 462 of the rectangular frame-shaped main body 46. On the other hand, the elastic support part 40 is connected to the fixed part 10 at the other side part (opposite sides) 461 so that the pair of movable part side connecting parts 441, 442 are freely deformable in the direction perpendicular to the surface.

[0066] In this way, the elastic support portion 40 is disposed on the base body 31 in the same layer as the core 22, and is disposed to the side of the coil 50. Furthermore, the weights 82, 84, together with the elastic support portion 40, are disposed to the side of the core 22 and the coil 50, that is, on the XY plane passing through the layer of the core 22 and the coil 50. The elastic support portion 40, together with the weights 82, 84, are disposed in the same layer as the coil 50. This allows the entire vibration actuator 1 to be made thinner.

[0067] The thickness of the elastic support part 40 defines a gap G which is a movable area of ​​the movable part 60. When the elastic support part 40 deforms and is displaced in the gap G, the weight pieces 82, 84 form a gap G1 which separates the movable core 70 and the coil 50 so that the magnetic force generating part 20 (specifically, the core 22) does not hinder the displacement of the movable part 60 associated with the deformation.

[0068] In addition, the elastic support part 40 is a square frame-shaped body, and is connected to the fixed part 10 at a pair of sides 461 via fixed part side connection parts 421, 422, and is connected to the movable part 60 at the other pair of sides 462 via movable part side connection parts 441, 442.

[0069] As a result, the elastic support part 40 supports the movable part 60 symmetrically and in a well-balanced manner at the center of the movable part 60 in the direction perpendicular to the surface of the base part 30 and in the directions perpendicular to the surface (X direction and Y direction) relative to the base part 30. In addition, since the elastic support part 40 is a square frame-shaped body, stress dispersion during elastic deformation is possible, and the movable part 60 can move in the vibration direction (Z direction) without tilting relative to the base part 30. This can improve the reliability and stability of the vibration state.

[0070] Furthermore, since the elastic support part 40 is a rectangular frame body (here, a thin plate frame body), it is possible to reduce the number of parts and make the overall thickness thinner. Furthermore, since it can be manufactured without bending parts, etc., the dimensional accuracy is high.

[0071] In addition, the elastic support portion 40 has a spring constant K sp By setting these parameters, the amount of displacement and natural frequency of the movable part 60 can be determined. Furthermore, when the movable part 60 is driven, that is, when electricity is passed through the coil 50, a displacement occurs, which creates a mechanical tactile sensation.

[0072] This ensures reliability in the movement of the vibration actuator 1. Excessive movement of the movable part 60 towards the base part 30 is restricted by the opposing surfaces 702, 704 of the movable core 70 abutting against the surfaces of the core ends 221, 222.

[0073] <Magnetic circuit of vibration actuator 1> 9 is a diagram for explaining the magnetic circuit of the vibration actuator, and is a cross-sectional view of the vibration actuator shown in FIG.

[0074] As shown in FIG. 9, when a current is passed through coil 50 of magnetic force generating unit 20, core 22 is excited to generate a magnetic field, and core ends 221, 222 of core 22 (more specifically, core ends 221, 222) become magnetic poles. For example, if one core end 221 of core 22 becomes an N pole and the other core end 222 becomes an S pole, a magnetic circuit indicated by magnetic flux flow M is formed between core 22 and opposing surfaces 702, 704 of movable core 70.

[0075] The flow of magnetic flux M in this magnetic circuit flows from one core end 221 to the opposing surface 702 of the opposing movable core 70, passes through the movable core 70, and reaches the opposing surface 702 to the opposing surface 704. Next, the magnetic flux M flows from the opposing surface 704 to the other core end 222 of the core 22, passes through the core 22, and is emitted from the one core end 221 again.

[0076] As a result, due to the principle of an electromagnetic solenoid, the core ends 221, 222 of the core 22 generate a magnetic attraction force KR. That is, in the electromagnet, a magnetic attraction force KR is generated in a direction perpendicular to the winding axis of the coil 50, and both of the opposing surfaces 702, 704 of the movable core 70 are attracted to both of the core ends 221, 222.

[0077] Since the base unit 30 is fixed to the housing, the movable core 70 moves closer to the magnetic force generating unit 20 side (in the -Z direction).

[0078] Next, when the current to the coil 50 is stopped, the magnetic field disappears, the magnetic attraction force KR of the movable part 60 disappears, and the biasing force of the elastic support part 40 that has been deformed toward the base part 30 is released. That is, a reaction force (force in the -KR direction) of the spring that serves as the elastic support part 40 is generated.

[0079] The reaction force (-KR) of the elastic support part 40 causes the movable part 60 to move (move in the positive Z direction opposite to the attraction direction of the magnetic attraction force KR) in an attempt to return to its original position (the position of the movable part 60 shown by the dotted line in FIG. 9, or the position in a non-driven stationary state which is the reference position as shown in FIG. 7) At this time, the reaction force (-KR) causes the movable part 60 to move to a position displaced in a direction away from the base part 30 from the stationary position in the stationary state, generating strong vibrations.

[0080] This vibration is repeatedly attenuated as the biasing force attenuates, resulting in free vibration. Alternatively, the coil 50 may be energized and deenergized repeatedly to cause the movable part 60 to reciprocate in the -Z direction to generate vibration. In this manner, in the magnetic force generating unit 20, the movable part 60 is supported in a state as if suspended by the elastic support part 40 relative to the base part 30. When energized, the movable part 60 functions as an electromagnet, and is mechanically displaced by the magnetic attraction force generated between the movable part 60 and the opposing surfaces 702, 704 of the movable core 70, which is a magnetic body, and then freely vibrates.

[0081] In this way, the magnetic force generating unit 20 moves the movable part 60 towards the base part 30 by the magnetic attraction force generated between the core ends 221, 222 of the core 22 and the opposing surfaces (movable core 70 which is a magnetic body) 702, 704 by energizing the coil 50. This movement of the movable part 60 generates vibrations of the movable part 60 due to the elastic force (biasing force) generated in the elastic support part 40, providing a tactile sensation to the user.

[0082] In the vibration actuator 1, the magnetic force generating unit 20 has a plate-shaped coil 50 wound around a thin plate-shaped core 22. The core 22 is supported by an elastic support 40 so as to be movable in the Z direction relative to the base unit 30 with the coil 50 inserted through a base opening 38 of the thin plate-shaped base unit 30. A portion of the coil 50 is also disposed within an opening 72 of the movable core 70, thereby achieving an even thinner (lower profile) structure. In this embodiment, a portion of the coil 50 is disposed within the opening 72 even in a stationary state, thereby achieving an even thinner structure.

[0083] The magnetic force generating unit 20 does not have a magnet, and is configured as a thin plate that vibrates, and is low-profile, which allows for space-saving installation. In other words, the configuration of the vibration actuator 1 having the magnetic force generating unit 20 is thinner than a configuration in which members that generate magnetism and drive a movable part in the Z direction are stacked in the Z direction, such as a coil and a magnet that are arranged facing each other in the Z direction. The vibration actuator 1 can be made thinner and smaller, and can provide a suitable tactile sensation corresponding to the user's pressing operation on the vibration presentation unit.

[0084] <Driving principle of vibration actuator 1 (magnetic force generating unit 20)> The driving principle of the vibration actuator 1 will be briefly described below. The vibration actuator 1 can also be driven by generating a resonance phenomenon using pulses based on the following equation of motion and circuit equation. Note that the operation is not limited to resonance driving, and may be, for example, a motion that expresses the operational feel of a track pad as the vibration presentation device 500 shown in FIG. 19, and may be driven by inputting a current pulse (which may be single or multiple) via a control unit (not shown).

[0085] The movable part 60 in the vibration actuator 1 performs a reciprocating motion based on the equations (1) and (2).

[0086]

number

[0087]

number

[0088] That is, the mass m [Kg], the displacement x(t) [m], and the thrust constant K f [N / A], current i(t) [A], spring constant K sp [N / m], damping coefficient D [N / (m / s)], etc. can be changed as appropriate within the range that satisfies formula (1). In addition, voltage e(t) [V], resistance R [Ω], inductance L [H], back electromotive force constant K e [V / (rad / s)] can be changed as appropriate within the range that satisfies formula (2).

[0089] In this way, the vibration in the vibration actuator 1 is determined by the mass m of the movable part 60 and the spring constant Ksp of the metal spring (a leaf spring in this embodiment) serving as the elastic support part 40. Furthermore, the vibration generated by the magnetic force generating part 20 can be set by the input voltage (pulse) and, if there is a vibration damping part, the degree of damping of the vibration damping part.

[0090] <Drive circuit for vibration actuator 1> FIG. 10 is a diagram showing a circuit configuration of a control unit of the vibration actuator according to the first embodiment.

[0091] The drive circuit shown in Fig. 10 is included in the control unit of the vibration actuator 1. The drive circuit has a switching element 2 as a current pulse supply unit configured by a MOSFET (metal-oxide-semiconductor field-effect transistor), a signal generation unit 4 as a voltage pulse application unit, resistors R1, R2, and SBDs (Schottky Barrier Diodes). This drive circuit is an example of a specific configuration of an actuator driver.

[0092] A signal generating unit 4, which is connected to a power supply voltage Vcc, is also connected to the gate of a switching element 2. The switching element 2 is a discharge changeover switch. The switching element 2 is connected to a vibration actuator 1 (shown as [Actuator] in FIG. 10), and in particular to a signal generating unit 4 of the vibration actuator 1. A voltage is applied to the vibration actuator 1 from a power supply unit Vact. Thus, the switching element 2 is turned on and off by gate voltage control by the signal generating unit 4, and when the switching element 2 is turned on, a current flows, and in the vibration actuator 1, a coil 50 that functions as part of a vibration generating unit is energized.

[0093] The control unit may have an arithmetic processing device including a central processing unit (CPU) that controls the entire device of the vibration presentation device in which the vibration actuator 1 is implemented, a main storage device including a random access memory (RAM) that operates as a working area of ​​the arithmetic processing device, and an auxiliary storage device including a non-volatile memory such as a flash memory or a hard disk that stores the operation program of the arithmetic processing device. The configuration including the arithmetic processing device, the main storage device, and the auxiliary storage device is an example of a specific configuration of a microcomputer. The arithmetic processing device reads out various control programs and various data associated with the programs (hereinafter, the various control programs and the various data are collectively referred to as "programs, etc.") from the auxiliary storage device. The arithmetic processing device stores the various data, etc. that have been read out in the main storage device, and executes the control program while using the data, etc. to realize various functions of the vibration presentation device. For example, the data may include pulse waveform data of various patterns that express a plurality of different vibration attenuation periods, a plurality of different vibration intensities, etc. The various control programs may include a program that, when information indicating an operator's contact operation is input, reads pulse waveform data for generating an actuator drive signal that generates a vibration corresponding to the input information, and generates the actuator drive signal in accordance with the read pulse waveform data.

[0094] The auxiliary storage device may be a storage medium that is detachable from the vibration presentation device. The control unit may be configured to be capable of communicating with the outside, so that a program or the like is downloaded from the outside to the control unit (main storage device or auxiliary storage device) via a communication network. The main storage device and auxiliary storage device described above are examples of non-transitory computer-readable storage media.

[0095] The coil 50 has high electrical conductivity and is made of, for example, copper. The core 22 is made of a material with high magnetic permeability (a ferromagnetic material, simply referred to as a magnetic material), and is preferably made of SECC, silicon steel plate, SUS, or the like. The elastic support portion 40 is preferably a non-magnetic material, and SUS, phosphor bronze, resin, rubber, or the like may be used as the non-magnetic material constituting the elastic support portion and the elastic body. The base portion 30 is preferably made of a material with high magnetic permeability, for example, SECC, silicon steel plate, SUS (ferromagnetic SUS), or the like. The weights 82, 84 are formed of a material with high specific gravity, such as phosphor bronze, SUS, tungsten, or the like.

[0096] (Embodiment 2) Fig. 11 is an external perspective view of a vibration actuator according to embodiment 2 of the present invention, and Fig. 12 is a bottom view of the vibration actuator. Fig. 13 is an exploded perspective view showing the main configuration of the vibration actuator, and Fig. 14 is an exploded perspective view of the vibration actuator. Fig. 15 is a perspective view of a core body of the vibration actuator from below. Fig. 16 is an exploded perspective view of the core body. Fig. 17 is a cross-sectional view taken along line CC in Fig. 11. Fig. 18 is a cross-sectional view taken along line DD in Fig. 11.

[0097] This vibration actuator 1A has the same basic configuration as the vibration actuator 1 corresponding to embodiment 1 shown in Figure 1, and the same components are given the same reference numerals and their explanation will be omitted. Furthermore, components with a similar configuration but different functions will be explained with the same name and reference numeral plus A or a different reference numeral. Furthermore, vibration actuator 1A operates with the same control circuit as vibration actuator 1 and the same driving principle using the above formulas (1) and (2).

[0098] In the vibration actuator 1 of the above-mentioned embodiment 1, the elastic support member 40 is attached to the base portion 30 of the fixed portion 10, and the weights 82, 84 are provided on the elastic support member 40. However, as in the vibration actuator 1A of Figures 11 to 18, the elastic support member 40A may be attached to the core 22A of the magnetic force generating portion 20A in the fixed portion 10A. In this case, the elastic support member 40A may be attached to the movable core 70A of the movable portion 60A, and the weights 82A, 84A may be attached to the movable core 70A.

[0099] The vibration actuator 1A has a fixed part 10A, an elastic support part 40A and a movable part 60A. In the vibration actuator 1A, the fixed part 10A has a magnetic force generating part 20A and a base part 30A to which the magnetic force generating part 20A is fixed, and the movable part 60A has a movable core 70A and weights 82A and 84A.

[0100] <Base part 30A> The base portion 30A, like the base portion 30, is a member that supports the vibration actuator 1A as a whole and is used to attach the vibration actuator 1A to a housing (not shown) of the vibration presentation device.

[0101] The base portion 30A is a flat metal plate, similar to the base portion 30, and is made of a non-magnetic material such as austenitic SUS. The base portion 30A has a flat shape and is disposed along the XY plane, which allows the entire vibration actuator 1A to be made thinner.

[0102] The base portion 30A has a rectangular base portion main body 31A, and is provided at its center with a base opening 38 having the same function as that of the base portion 30, and a wiring opening 39. The base portion 30A is formed in a square shape, and a part of the coil 50 of the magnetic force generation unit 20A fixed to the base portion 30A is disposed in the base opening 38. In addition, the substrate portion 25 disposed on the magnetic force generation unit 20A is disposed in the wiring opening 39 when the magnetic force generation unit 20A is fixed to the base portion 30A.

[0103] The magnetic force generating unit 20A is fixed to the base unit 30A. The base portion 30A may be fixed, for example, to the back surfaces of both planar core end portions 221A, 222A protruding on both sides of the coil 50 in the magnetic force generating unit 20A.

[0104] The base portion 30A is fixed to the elastic support portion 40A by rivets serving as fastening members 35 at fixing pieces 2210, 2220 on both ends of the magnetic force generating portion 20A.

[0105] As a result, the core 22A of the magnetic force generating unit 20A is placed on the base unit 30A, and the movable core 70A of the movable unit 60A is joined so as to span the upper surface of this core 22A (fixed piece portions 2210, 2220 of the core 22A). At this time, the magnetic force generating unit 20A is disposed inside the elastic support portion 40A so as to span both sides of the base opening 38 on the base unit main body 31A.

[0106] Further, a recess 33 is formed on the back surface (outer surface) of the base portion 30A. The extension portion 28 is disposed in the recess 33, and the back surface portion of the base connecting portion 321 in the recess 33 functions as a counterbore when fastening with a fastening member 35 such as a rivet. A concave counterbore portion 34 is formed on the back surface of the base connecting portion 322.

[0107] <Magnetic force generating unit 20A> As shown in FIGS. 13 to 16, the magnetic force generating unit 20A has a coil 50, a plate-shaped core 22A around which the coil 50 is mounted, and a substrate unit 25 connected to the coil 50.

[0108] The magnetic force generating unit 20A differs from the magnetic force generating unit 20 in that it has fixed piece portions 2210, 2220 to which the elastic support portion 40A is connected. Therefore, the same components as those of the magnetic force generating unit 20 are given the same names and reference numerals, and the description thereof will be omitted.

[0109] The magnetic force generating unit 20A is an electromagnet that excites the core 22A and generates a magnetic force when a current is passed through a coil 50 wound around the center of the magnetic force generating unit 20A via an insulating film portion 27. The core 22A has fixing pieces 2210 and 2220 that are joined to the elastic support portion 40A in the configuration of the core 22A.

[0110] The fixed pieces 2210, 2220 are provided so as to protrude from the core ends 221A, 222A of the core 22A in the longitudinal direction (coil axis direction) of the core 22A, and have the same thickness as the core ends 221A, 222A. As a result, when the magnetic force generating unit 20A is fixed to the base body 31A of the base 30A, the elastic support unit 40A is disposed at the position of a layer that overlaps with the layer of the core 22A outside the core ends 221A, 222A of the magnetic force generating unit 20A. As a result, the core 22A is fixed to the base body 31A, and the elastic support unit 40A disposed outside the core ends 221A, 222A can be positioned. Note that the substrate unit 25 to which the coil wire 52 is connected via the fillet 254 is attached to the back surface of the core 22A. When the core 22A is fixed to the base 30A, the substrate unit 25 is connected to the extension unit 28 at the bottom surface.

[0111] <Elastic support portion 40A> The elastic support portion 40A is a rectangular frame-shaped leaf spring configured similarly to the elastic support portion 40, and is connected to the fixed portion 10A and the movable portion 60A.

[0112] The elastic support portion 40A elastically supports the movable portion 60A, which moves in the vertical direction upon receiving a magnetic force from the fixed portion 10A.

[0113] The elastic support 40A may have an outer shape with the same dimensions as the base body 31A, for example. The elastic support 40A is fixed on the base body 31A via the fixing pieces 2210 and 2220 of the core 22A, and is fixed in a state where it is floating from the base body 31A by the thickness of the core 22A. As a result, the elastic support 40A protrudes from the fixing pieces 2210 and 2220 on the base body 31A, and is deformed in the Z direction and the -Z direction above the outer edge of the base body 31A, and is freely displaceable.

[0114] The elastic support part 40A has a movable core 70A attached to the upper surfaces of the movable part side connecting parts (a pair of first connecting parts) 441A, 442A. In this manner, the elastic support part 40A is disposed on the base part main body 31A so as to surround the magnetic force generating part 20A, and supports the movable part 60A so as to be movable in the vertical direction relative to the magnetic force generating part 20A.

[0115] The movable part side connection parts 441A, 442A and the movable core 70A may be fixed using fastening members such as screws or screws, adhesives, etc., but may also be fixed by joining both parts via recesses and protrusions that are provided on both parts and have shapes that can fit together. For example, the movable core 70A is provided with a convex boss (projection) that protrudes toward the movable part side connection parts 441A, 442A at the spring joint 76, and the movable part side connection parts 441A, 442A are provided with a joint hole 444 into which the boss part fits. The joint hole 444 may be an elongated hole into which a part of the boss part fits. The joint hole 444 has a boss part disposed inside and functions to position the movable part side connection parts 441A, 442A relative to the movable part 60A, and also fixes the boss part that is pressed in.

[0116] <Movable core (magnetic member) 70A> The movable core 70A differs from the movable core 70 in that it has a spring joint 76. The movable core 70A is disposed on the elastic support portion 40A, and the layers of the movable core 70A are stacked on the layers of the elastic support portion 40A. The movable core 70A has a spring joint portion 76, and is joined to the movable portion side connection portions 441A and 442A of the elastic support portion 40A at the spring joint portion 76. The movable core 70A is a rectangular plate-shaped frame having an opening 72 in the center, and the upper part of the coil 50 is disposed within the opening 72.

[0117] The movable core 70A entirely faces the surfaces of the core ends 221A, 222A of the magnetic force generating unit 20A at the facing surfaces 702, 704. When the coil 50 is energized, a magnetic attraction force is generated between the facing surfaces 702, 704 and the core ends 221A, 222A.

[0118] The movable core 70A moves in the -Z direction when current is applied to the coil 50, and moves in the Z direction due to the biasing force of the elastic support portion 40A.

[0119] A weight portion 80A (weight pieces 82A, 84A) is attached to the movable core 70A via a weight fixing portion 77. The weight portion 80A is disposed on the layer to which the elastic support portion 40A is attached.

[0120] <Weight part 80A (weight piece 82A, 84A)> The weight portion 80A (weight pieces 82A, 84A) is fixed to the movable core 70A, and has the function of increasing the weight of the movable portion 60A and promoting vibration.

[0121] The weight portion 80A is a plate-like body, and has a plurality of plate-like weight pieces 82A, 84A. The weight pieces 82A, 84A are members formed, for example, in the same shape, which reduces the manufacturing cost.

[0122] The weights 82A and 84A are disposed in the region between the base portion 30A and the movable core 70A, that is, in the layer between the layer of the base portion 30A and the layer of the movable core 70A, in which the frame-shaped elastic support portion 40A is disposed. In addition, the weights 82A and 84A are disposed in a region inside the elastic support portion 40A that avoids the magnetic force generating portion 20A. The weights 82A and 84A have a shape that allows them to be disposed in such a region.

[0123] The weights 82A, 84A are arranged inside the frame-shaped main body 46A, between the pair of sides 462 and the magnetic force generation unit 20A, and have cutouts 828, 848, with the movable unit side connection units 441A, 442A being arranged in the cutouts 828, 848. The weights 82A, 84A are arranged in the same layer as the elastic support unit 40A in the XY directions, and are connected to the movable core 70A on the upper surface.

[0124] As a result, when the movable core 70A moves, the weights 82A, 84A move together with the movable part side connecting parts 441A, 442A in response to the movement of the movable core 70A. The weights 82A, 84A are arranged in the layer in which the elastic support part 40A and the magnetic force generating part 20A are arranged so as to fill the dead space between the elastic support part 40A and the magnetic force generating part 20A and to be able to vibrate. This makes it possible to increase the vibration output while reducing the thickness of the vibration actuator 1A.

[0125] Furthermore, the weights 82A and 84A are configured to have a thickness equal to or less than that of the core 22A (for example, 0 mm<thickness of weights 82A and 84A≦thickness of core 22A). As a result, even if the movable part 60A moves in a direction approaching the fixed part 10A, the weights 82A and 84A do not interfere with the base part main body 31A before the core 22 interferes with the movable core 70A (opposing surfaces 702, 704).

[0126] <Vibration presentation device 500> Fig. 19 is a diagram showing an example of a vibration presentation device having a vibration actuator. For convenience, the planar track pad body that an operator presses with his / her finger is shown in a see-through manner in Fig. 19. Although Fig. 19 uses a vibration actuator 1 for explanation, a vibration actuator 1A may be used instead of the vibration actuator 1.

[0127] The vibration presentation device 500 is, for example, a track pad serving as a pointing device used in place of a mouse in a notebook computer or the like.

[0128] The track pad as the vibration presentation device 500 is disposed in a rectangular opening provided in the housing of a notebook computer or the like. The track pad has a plate-shaped pad body 510 that is traced with a finger as a touch operation, and a vibration actuator 1 disposed on the back surface of the pad body 510. Specifically, the pad body 510 is disposed in a recess of the housing facing a bottom 520 of the recess, and the vibration actuator 1 is disposed between the bottom 520 of the recess on the back surface of the pad body 510. The base unit 30 is fixed to the back surface of the pad body 510, and the movable unit 60 is mounted in a suspended state. Also, the movable unit 60 and the fixed unit 10 may be connected between the pad body 510 and the bottom 520 of the recess on the back surface side of the pad body 510.

[0129] In the track pad, the vibration actuator 1 applies vibrations that provide a tactile sensation when the user performs a touch operation such as tracing or tapping the pad main body 510 with a finger. Specifically, in the vibration actuator 1, electricity is applied to the coil 50 in response to the user's touch operation on the pad main body 510, which is the operation surface, and the coil 50 vibrates the movable part 60 to provide a tactile sensation to the user. For example, the vibration actuator 1 is attached to the back side of the central part of the pad main body 510 using double-sided tape, or a fastening member such as a screw, a screw, an adhesive, or welding.

[0130] In addition, the vibration actuators 1, 1A in this embodiment are configured such that the base portions 30, 30A, elastic support portions 40, 40A, and movable cores 70, 70A are rectangular plate-shaped, and have weight portions 80, 80A of a corresponding shape, but each may also be configured in a disk shape (the elastic support portions are annular). [Industrial Applicability]

[0131] The vibration actuator and vibration presentation device according to the present invention ensure the thinness of the entire device and have the effect of vibrating stably with high output, and are useful, for example, as a vibration generator used in a vibration presentation device. [Explanation of symbols]

[0132] 1, 1A vibration actuator 2. Switching elements 4. Signal Generator 10, 10A fixed part 20, 20A Magnetic force generator 22, 22A Core 25 Circuit Board 27 Insulating film part 28 Extension 30, 30A Base 31, 31A Base unit 33 Recess 34 Counterbore 35 Fastening member 38 Base opening 39 Wiring opening 40, 40A Elastic support part 46, 46A Frame-shaped body 50 Coil 52 Coil wire 60, 60A moving parts 70, 70A moving core 72 Opening 76 Spring joint 77 Weight fixing part 80, 80A Plume part (plate-shaped plumb part) 82, 82A, 84, 84A Weight piece (plate-shaped weight part) 221, 221A, 222, 222A Core ends (both ends) 241 Adhesive 252 Double-sided tape 254 Fillet 312, 314 Notch 316, 318 Overhang 321, 322 Base connection part (protruding connection part) 421, 422 Fixed part side connection part (second connection part) 441, 441A, 442, 442A Movable part side connection part (first connection part) 444 Junction hole 461 Side (other side) 462 Side (one side) 500 vibration presentation device 510 Pad body 520 bottom 702, 704 Opposite surfaces 822, 842 Spring side connection part 2210, 2220 Fixed piece (tip)

Claims

1. a fixing part including a magnetic force generating part in which a plate-shaped magnetic core is inserted into a coil so that both ends of the magnetic core protrude from the coil, and a base part on which the magnetic force generating part is fixed with both ends overlapping each other; a movable portion including a plate-shaped magnetic member facing both ends from above in a direction perpendicular to the upper surface, and a weight portion disposed on a lower surface of the magnetic member at a position avoiding the magnetic force generating portion; a frame-shaped body having a first opposite side and a second opposite side surrounding the movable part, the elastic body being connected to the movable part at a pair of first connecting portions of the first opposite side and connected to the fixed part at a pair of second connecting portions of the second opposite side; having A magnetic force generated by energizing the coil causes the movable part to displace and vibrate so as to approach the fixed part. Vibration actuator.

2. The base portion has an opening at a center portion, The magnetic force generating unit is fixed to the base portion with a lower portion of the coil disposed within the opening.

2. The vibration actuator according to claim 1.

3. The frame-shaped body of the elastic body is formed so as to surround the base portion, and the second opposite sides of the frame-shaped body are fixed to protruding connection portions protruding from an outer periphery of the base portion by the pair of second connection portions.

2. The vibration actuator according to claim 1.

4. The weight portion includes a plurality of weight pieces each fixed on the pair of first connection portions and connected to the magnetic member by bridging the upper surface of the weight piece.

4. The vibration actuator according to claim 3.

5. the base portion is provided with cutout portions in which the pair of first connection portions are arranged so as to be freely movable in the direction perpendicular to the surface; 4. The vibration actuator according to claim 3.

6. 2. The vibration actuator according to claim 1, wherein the weight portion is a plate-like weight portion having a thickness equal to or smaller than that of the magnetic core, and is disposed in the same layer as the elastic body.

7. A plate-shaped fixing piece portion is provided at each of the two end portions, the plate-shaped fixing piece portion extending in the axial direction of the coil and disposed on the upper surface, the elastic body is fixed to the fixing piece portion by the pair of second connection portions so that the frame-shaped body is spaced from the upper surface of the base portion, The vibration actuator according to claim 6.

8. The magnetic member has an opening in which a portion of the coil is disposed.

2. The vibration actuator according to claim 1.

9. A vibration presentation device in which the vibration actuator according to any one of claims 1 to 8 is disposed on a back surface of an operation surface, current is applied to the coil in response to a touch operation of the user on the operation surface, and the movable part is displaced to approach the fixed part, thereby presenting a vibration; Vibration presentation device.

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