Actuator and vibration generating device

Abstract

The vibration generating device includes an actuator and a control unit. The actuator includes: a mounting member having a bottom wall portion; a coil fixed to the mounting member; and a movable element. The movable element is located at an origin position in a state in which the coil is not energized, is displaced toward the bottom wall portion by energizing the coil in one direction, and is displaced toward the opposite side from the bottom wall portion by energizing the coil in the other direction. The control unit controls the energization of the coil and switches the energization direction of the coil such that the amount of displacement of the movable element from the origin position to the bottom wall portion side is less than a predetermined amount of displacement, thereby repeatedly displacing the movable element with respect to the attachment member. The movable element is displaceable so as to protrude from the mounting member when displacing to the side opposite to the bottom wall portion.

Description

Technical Field

[0001] The present disclosure relates to an actuator and a vibration generating device. Background Art

[0002] An actuator is disclosed in International Publication No. 2020 / 184439. The actuator includes: a mounting member having a coil; and a mover supported by the mounting member via an elastic support. The coil described in this document is energized via a cable. Further, by switching the energization to the coil via a wire, the mover repeatedly displaces (vibrates) relative to the mounting member. Summary of the Invention

[0003] [Problems to be Solved by the Invention]

[0004] However, in an actuator having a structure in which a mover repeatedly displaces relative to a mounting member and a vibration generating device including the actuator, it is desired to reduce the volume of the actuator and increase the amplitude of the mover.

[0005] In consideration of the above facts, an object of the present disclosure is to obtain an actuator and a vibration generating device capable of reducing the volume of the actuator and increasing the amplitude of the mover.

[0006] [Means for Solving the Problems]

[0007] The actuator according to the first aspect includes: a mounting member having a bottom wall portion and being open on a side opposite to the bottom wall portion; a coil disposed inside the mounting member and fixed to the mounting member; and a mover having a magnet disposed opposite to the coil, being located at an origin position in a state where the coil is not energized, displacing toward the bottom wall portion side by energizing the coil in one direction, and displacing toward a side opposite to the bottom wall portion by energizing the coil in the other direction, and the mover is capable of displacing in a manner of protruding from the mounting member when displacing toward the side opposite to the bottom wall portion.

[0008] According to the actuator of the first aspect, the mover repeatedly displaces relative to the mounting member toward the bottom wall portion side and the side opposite to the bottom wall portion. Here, when the mover displaces toward the side opposite to the bottom wall portion, it is capable of displacing in a manner of protruding from the mounting member. Thereby, the volume of the actuator can be reduced, and the amplitude of the mover can be increased.

[0009] In the actuator of the second aspect, in the actuator of the first aspect, the displacement amount of the mover toward the side opposite to the bottom wall portion is larger than the displacement amount toward the bottom wall portion side.

[0010] In the actuator according to the second mode, the displacement amount of the mover toward the side opposite to the bottom wall portion is larger than the displacement amount toward the bottom wall portion side. Thereby, contact between the mover and the bottom wall portion of the mounting member can be suppressed, and the amplitude of the mover can be increased.

[0011] In the brake of the third mode, in the actuator of the first mode or the second mode, the displaceable amount of the elastic support body, a part of which is fixed to the mounting member and another part of which is fixed to the mover, toward the bottom wall portion side is larger than the distance between the mover and the bottom wall portion.

[0012] In the actuator according to the third mode, the displaceable amount of the elastic support body toward the bottom wall portion side is larger than the distance between the mover and the bottom wall portion. Thereby, the amplitude of the mover toward the side opposite to the bottom wall portion can be made larger than the distance between the mover and the bottom wall portion. Therefore, contact between the mover and the bottom wall portion of the mounting member can be suppressed, and the amplitude of the mover can be increased.

[0013] In the actuator of the fourth mode, in the actuator of any one of the first mode to the third mode, it is configured that when the coil is energized, the initial movement of the mover is to displace toward the bottom wall portion side.

[0014] In the actuator according to the fourth mode, when the coil is energized, the mover is configured such that the initial movement is to displace toward the bottom wall portion side. Thereby, in the case of short vibrations in which the vibration of the mover is amplified and attenuated, the maximum displacement of the mover appears on the side opposite to the bottom wall portion. Therefore, contact between the mover and the bottom wall portion of the mounting member can be suppressed, and the amplitude of the mover can be increased.

[0015] In the actuator of the fifth mode, in the actuator of any one of the first mode to the fourth mode, an opening is formed in the elastic support body, a part of which is fixed to the mounting member and another part of which is fixed to the mover.

[0016] In the actuator according to the fifth mode, heat inside the actuator can be dissipated through the opening formed in the elastic support body.

[0017] The vibration generating device of the sixth mode includes: an actuator of any one of the first mode to the fifth mode; and a control unit that controls the energization direction of the coil so that the maximum displacement amount of the mover from the origin position toward the side opposite to the bottom wall portion is more than the maximum displacement amount of the mover from the origin position toward the bottom wall portion side.

[0018] In the vibration generating device according to the sixth aspect, the control unit controls the energization direction of the coil so that the maximum displacement amount of the movable element from the origin position to the side opposite to the bottom wall portion is greater than the maximum displacement amount of the movable element from the origin position to the bottom wall portion side. Thereby, contact between the movable element and the bottom wall portion of the mounting member can be suppressed, and the amplitude of the movable element can be increased.

[0019] In the vibration generating device according to the seventh aspect, in the vibration generating device according to the sixth aspect, the control unit controls the energization direction of the coil so that the movable element is displaced toward the bottom wall portion side during the initial movement of the movable element.

[0020] In the vibration generating device according to the seventh aspect, the control unit controls the energization direction of the coil so that the movable element is displaced toward the bottom wall portion side during the initial movement of the movable element. Thereby, in the case where short vibrations are generated due to amplification and attenuation of the vibrations of the movable element, the maximum displacement of the movable element appears on the side opposite to the bottom wall portion. Therefore, contact between the movable element and the bottom wall portion of the mounting member can be suppressed, and the amplitude of the movable element can be increased.

[0021] [Advantages of the Invention]

[0022] The actuator and the vibration generating device of the present invention have excellent effects of being able to reduce the volume of the actuator and increase the amplitude of the movable element. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a perspective view showing the actuator.

[0024] Figure 2 It is an exploded perspective view showing the actuator disassembled.

[0025] Figure 3 It is a cross-sectional view showing a cross-section of the actuator cut along the X direction and the Z direction.

[0026] Figure 4 It is a perspective view of the mounting member etc. in a state where the coil is fixed.

[0027] Figure 5 It is a top view of the mounting member etc. in a state where the coil is fixed.

[0028] Figure 6 It is a cross-sectional view of the mounting member etc. in a state where the coil is fixed, showing a cross-section cut along the X direction and the Y direction at portions corresponding to the first communication hole and the second communication hole.

[0029] Figure 7 It is a sectional perspective view of the mounting member etc., showing a cross-section cut along the X direction and the Y direction at portions corresponding to the first communication hole and the second communication hole.

[0030] Figure 8 It is a block diagram showing the functional structure of the control unit.

[0031] Figure 9 It is a block diagram schematically showing the control unit.

[0032] Figure 10 It is a flowchart showing the control of the control unit.

[0033] Figure 11 It is a graph showing the relationship between the voltage applied between coils and time.

[0034] Figure 12 It is a diagram schematically showing the positional relationship between the mover and the mounting member.

[0035] Figure 13 It is a graph showing the relationship between the voltage applied between coils and time. Detailed implementation mode

[0036] The following uses Figures 1 to 9 to describe the vibration generating device 100 according to the embodiment of the present invention. As Figure 1 shown, the vibration generating device 100 is configured to include an actuator 10 and a control unit 102 that controls the actuator 10. First, the actuator 10 will be described, and then the control unit 102 will be described. In addition, the arrow X direction, arrow Y direction, and arrow Z direction shown in the figure represent the respective directions of the actuator 10. In the following description, the +Z direction shown in each figure is referred to as the upward direction, and the -Z direction is referred to as the downward direction. However, this is a direction concept based on the actuator and does not limit the mounting posture of the actuator. In addition, the axis parallel to the Z direction and passing through the center of gravity of the mover 14 described later is referred to as the center of gravity axis AX of the mover 14. Moreover, the direction approaching the center of gravity axis AX of the mover 14 in the X direction is referred to as the inner side in the X direction, the direction away from it is referred to as the outer side in the X direction, the direction approaching the center of gravity axis AX of the mover 14 in the Y direction is referred to as the inner side in the Y direction, and the direction away from it is referred to as the outer side in the Y direction. In addition, the +X direction is referred to as one side in the X direction, the -X direction is referred to as the other side in the X direction, the +Y direction is referred to as one side in the Y direction, the -Y direction is referred to as the other side in the Y direction, the +Z direction is referred to as one side in the Z direction, and the -Z direction is referred to as the other side in the Z direction.

[0037] As Figure 1 shown, as an example, the actuator 10 of the present embodiment is an actuator that vibrates a vibration target unit 104 such as a display unit configured as a touch panel, such as a liquid crystal panel, and various controllers (refer to Figure 9 ) by being mounted on the vibration target unit 104. By controlling the energization of the actuator 10, various touch sensations can be given to the fingers of the user who touches the touch panel, controller, etc.

[0038] As Figure 1 and Figure 2 shown, the actuator 10 includes: a mounting member 12 mounted on a mounting object such as a display unit of a tablet terminal; a coil 24 fixed to the mounting member 12; a mover 14 displaceable relative to the mounting member 12; and an elastic support 16 that elastically supports the mover 14 relative to the mounting member 12. In addition, the actuator 10 includes two buffers 18 that damp the vibration of the elastic support 16 and two cover members 20 mounted on the elastic support 16 and covering one side surface of the buffers 18. And, as Figure 4 shown, the actuator 10 includes a pair of terminals 28 for energizing the coil 24 and a pair of cables 80.

[0039] (Structure of the mounting member 12)

[0040] As Figures 1 to 6 shown, the mounting member 12 includes a frame body 22 formed in a box shape and a mounting adhesive sheet 26. In addition, the mounting member 12 is not limited to being formed in a box shape.

[0041] As an example, the frame body 22 is formed of a resin material and is formed in a box shape open on one side in the Z direction. In addition, the frame body 22 is not limited to a resin material. The frame body 22 includes a bottom wall portion 30 formed in a rectangular shape with the Z direction as the thickness direction, the X direction as the long side direction when viewed from the Z direction, and the Y direction as the short side direction. As Figure 2 and Figure 4 shown, a circular opening 32 penetrating in the Z direction is formed at the center portions of the bottom wall portion 30 in the X direction and the Y direction.

[0042] In addition, the frame body 22 includes a pair of first side wall portions 36 standing up from the end portions on one side and the other side in the X direction of the bottom wall portion 30 toward one side in the Z direction and a pair of second side wall portions 38 standing up from the end portions on one side and the other side in the Y direction of the bottom wall portion 30 toward one side in the Z direction.

[0043] As Figure 2 shown, the end portions on one side and the other side in the Y direction of the end surfaces on one side in the Z direction of the pair of first side wall portions 36 each become base portions 40. Here, as Figures 4 to 7 shown, in the mounting member 12 of the present embodiment, a metal frame 23 is fixed to the frame body 22 by insert molding or the like. Most of the metal frame 23 is included in the frame body 22. In addition, a part of the metal frame 23 is exposed on the end surface on one side in the Z direction of each base portion 40.

[0044] In addition, the frame body 22 has a central protrusion 44 that protrudes from the central portion in the Y direction of one first side wall portion 36 toward the other first side wall portion 36 side. Moreover, the frame body 22 has a central protrusion 44 that protrudes from the central portion in the Y direction of the other first side wall portion 36 toward the one first side wall portion 36 side. Here, the central portion in the Y direction of the end surface on the Z direction side of the one central protrusion 44 and the end surface on the Z direction side of the one first side wall portion 36 form a buffer member adhesion surface 46 for adhering the following-described one buffer member 18. In addition, the central portion in the Y direction of the end surface on the Z direction side of the other central protrusion 44 and the end surface on the Z direction side of the other first side wall portion 36 form a buffer member adhesion surface 46 for adhering the following-described other buffer member 18. In addition, the frame body 22 has a central outer protrusion 45 that protrudes from the central portion in the Y direction of one (X direction side) first side wall portion 36 toward the outside (X direction side) of the frame body.

[0045] (Structure of the coil 24)

[0046] As Figures 2 to 6 shown, the coil 24 is formed by winding a conductive wire in a ring shape with the Z direction as the axis. As Figure 3 shown, in the present embodiment, by winding a conductive wire around a formed ring-shaped bobbin 25, the coil 24 is formed around the bobbin 25. The coil 24 is supported by the bottom wall portion 30 of the frame body 22 via the bobbin 25. In addition, in Figure 3 , the illustration of the cross-sectional shading is omitted.

[0047] (Structure of the mounting adhesive sheet 26)

[0048] As Figure 1 and Figure 2 shown, the mounting adhesive sheet 26 is a component for mounting the actuator 10 to a mounting object. The mounting adhesive sheet 26 is an adhesive sheet with adhesive surfaces on both sides. The mounting adhesive sheet 26 is adhered to the lower surface side of the bottom wall portion 30 of the frame body 22. In addition, a circular opening 26A corresponding to the opening 32 formed in the bottom wall portion 30 of the frame body 22 is formed in the mounting adhesive sheet 26.

[0049] (Structure of the mover 14)

[0050] The mover 14 is configured to include a yoke 50, a magnet 52, and a pole piece 54.

[0051] The yoke 50 is formed of a soft magnetic material. The yoke 50 has a top wall portion 50A formed in a disc shape with the Z direction as the thickness direction and a peripheral wall portion 50B extending downward from the outer peripheral edge of the top wall portion 50A.

[0052] The magnet 52 is formed in a disk shape with the Z direction as the axis. The magnet 52 is fixed to the lower surface side of the top wall portion 50A of the yoke 50 in a state of being disposed inside the peripheral wall portion 50B of the yoke 50.

[0053] The pole piece 54 is formed of a soft magnetic material. The pole piece 54 is formed in a disk shape with the Z direction as the axis and is fixed to the lower surface side of the magnet 52.

[0054] In the mover 14 described above, a magnetic circuit is formed by the yoke 50, the magnet 52, and the pole piece 54. A space is formed between the magnet 52 and the pole piece 54 and the peripheral wall portion 50B of the yoke 50, and the coil 24 is disposed in this space.

[0055] (Structure of the elastic support 16)

[0056] As Figure 1 and Figure 2 shown, as an example, the elastic support 16 is formed using a metal plate formed in a plate shape (planar shape). The shape of the elastic support 16 in the free state (state where no external force is applied) is formed in a plate shape with the entire elastic support 16 along a direction orthogonal to the Z direction.

[0057] A part of the elastic support 16 is fixed to the mounting member 12, and another part is fixed to the mover 14. In the elastic support 16, the portion between the portion fixed to the mounting member 12 and the portion fixed to the mover 14 becomes the deformation portion 60, and the deformation portion 60 becomes the portion that deforms when the mover 14 is displaced (vibrates). Specifically, the elastic support 16 is composed of four fixed portions 56 on the mounting member side fixed to the mounting member 12, a fixed portion 58 on the mover side fixed to the mover 14, and four deformation portions 60 connecting the fixed portion 56 on the mounting member side and the fixed portion 58 on the mover side. In the present embodiment, the size of the deformation portion 60 is set such that the displaceable amount of the fixed portion 58 on the mover side relative to the fixed portion 56 on the mounting member side toward the bottom wall portion 30 is larger than the distance between the mover 14 and the bottom wall portion 30.

[0058] The four fixed portions 56 on the mounting member side are formed in a rectangular shape corresponding to the four base portions 40 of the frame body 22 when viewed from the Z direction. The four fixed portions 56 on the mounting member side are respectively fixed to a part of the metal frame 23 (refer to Figure 4 ) exposed on the base portion 40 by welding or the like.

[0059] When viewed from the Z direction, the fixed portion 58 on the mover side is formed in a circular shape with a diameter smaller than the top wall portion 50A of the yoke 50 that constitutes a part of the mover 14. The fixed portion 58 on the mover side is fixed to the top wall portion 50A of the yoke 50 by welding or the like.

[0060] In addition, an opening 61 is formed between the fixed portion 58 and the deforming portion 60 on the movable element side in the elastic support 16. Thus, heat inside the actuator 10 can be dissipated through the opening 61.

[0061] (Structure of the buffer material 18)

[0062] As Figure 2 shown, the buffer material 18 is formed into a plate shape using a viscoelastic material, with the Z direction as the thickness direction, and is formed into a rectangular shape when viewed from the Z direction. The surface (lower surface) on the other side of the buffer member 18 in the Z direction becomes an adhesive surface that can be bonded to other components. In addition, the surface (upper surface) on one side of the buffer member 18 in the Z direction becomes an adhesive surface that can be bonded to other components.

[0063] Moreover, the adhesive surface on the lower surface side of one buffer member 18 is adhered to one buffer member adhesive surface 46 of the frame body 22. Thus, one buffer member 18 is mounted on one buffer member adhesive surface 46 of the frame body 22. Similarly, the adhesive surface on the lower surface side of the other buffer member 18 is adhered to the other buffer member adhesive surface 46 of the frame body 22. Thus, the other buffer member 18 is mounted on the other buffer member adhesive surface 46 of the frame body 22.

[0064] Here, in a state where the elastic support 16 is mounted on the frame body 22, the adhesive surface on the upper surface side of one buffer member 18 is adhered to the lower surface side of a part of the deforming portion 60 of the elastic support 16. Similarly, in a state where the elastic support 16 is mounted on the frame body 22, the adhesive surface on the upper surface side of the other buffer member 18 is adhered to the lower surface side of a part of the deforming portion 60 of the elastic support 16.

[0065] (Structure of the cover member 20)

[0066] The cover member 20 is formed into a plate shape using a viscoelastic material, with the Z direction as the thickness direction, and is formed into a rectangular shape when viewed from the Z direction.

[0067] The surface (lower surface) on the other side of the cover member 20 in the Z direction becomes an adhesive surface that can be bonded to other components. In addition, the surface (upper surface) on one side of the cover member 20 in the Z direction does not become an adhesive surface. The adhesive surface on the lower surface side of one cover member 20 is adhered to the adhesive surface on the upper surface side of one buffer member 18 and the upper surface side of a part of the deforming portion 60 of the elastic support 16. Similarly, the adhesive surface on the lower surface side of the other cover member 20 is adhered to the adhesive surface on the upper surface side of the other buffer member 18 and the upper surface side of a part of the deforming portion 60 of the elastic support 16.

[0068] (Structure of the terminal 28)

[0069] As Figure 7 shown, a pair of terminals 28 are formed by bending a conductive metal plate cut into a specified shape. Here, one and the other of the pair of terminals 28 are referred to as a first terminal 28T1 and a second terminal 28T2, respectively.

[0070] The first terminal 28T1 has a cable joint portion 28A extending from the middle portion in the X direction toward the first side wall portion 36 side in the X direction on one side in the Y direction of the bottom wall portion 30 of the frame body 22. In addition, the first terminal 28T1 has a coil end joint portion 28B standing up from the end portion on the other side in the X direction of the cable joint portion 28A toward the Z direction side and extending toward the other side in the Y direction. Further, the second terminal 28T2 has a cable joint portion 28A extending from the middle portion in the X direction toward the first side wall portion 36 side in the X direction on the other side in the Y direction of the bottom wall portion 30 of the frame body 22. In addition, the second terminal 28T2 has a coil end joint portion 28B standing up from the end portion on the other side in the X direction of the cable joint portion 28A toward the Z direction side and extending toward the one side in the Y direction. The cable joint portions 28A of the first joint 28T1 and the cable joint portions 28A of the second joint 28T2 are fixed to the bottom wall portion 30 of the frame body 22. Further, on the cable joint portions 28A of the first joint 28T1 and the cable joint portions 28A of the second joint 28T2, the ends of a pair of cables 80 (refer to Figure 6 ) described later are joined by welding. Further, on the coil end joint portions 28B of the first terminal 28T1 and the coil end joint portions 28B of the second terminal 28T2, the ends on one side and the ends on the other side of the above-mentioned coil 24 (refer to Figure 6 ) are joined, respectively.

[0071] (Structure of the detailed part of the frame body 22)

[0072] Next, the structure of the portion in the frame body 22 where a pair of cables 80 described later are arranged will be described.

[0073] As Figure 6 and Figure 7 shown, the central portion in the Y direction, the central protruding portion 44, and the central outer protruding portion 45 of the first side wall portion 36 on the X direction side of the frame body 22 form a cable insertion portion 82 into which a pair of cables 80 are inserted. In this cable insertion portion 82, a first communication hole 84H1 and a second communication hole 84H2 that communicate the inside and the outside of the frame body 22 are formed. The first communication hole 84H1 and the second communication hole 84H2 are arranged side by side in the Y direction. Further, the first communication hole 84H1 is arranged on one side in the Y direction with respect to the second communication hole 84H2.

[0074] As Figure 6 and Figure 7As shown, in the cable insertion portion 82, the portion that separates the first communication hole 84H1 and the second communication hole 84H2 in the Y direction forms the first partition portion 86. The shape of the end portion 86A on the inner side of the frame body 22 in the first partition portion 86 is a shape in which both end portions in the Y direction are bent when viewed from the Z direction. In addition, the end portion 86A on the inner side of the frame body 22 in the first partition portion 86 is located on the X direction side with respect to the end surface 82A on the other side in the X direction of the cable insertion portion 82. Further, the end portion 86A on the inner side of the frame body 22 in the first partition portion 86 is located on the X direction side with respect to the portions of the pair of cables 80 described later that are fixed to the first terminal 28T1 and the second terminal 28T2 by welding.

[0075] The frame body 22 includes a second partition portion 88 that projects from the bottom wall portion 30 toward the Z direction side. The second partition portion 88 functions as a portion that separates the side where the mover 14 is disposed from the side where the crossing portion 90 of the cable 80 inserted into the first communication hole 84H1 and the cable 80 inserted into the second communication hole 84H2 is disposed in the X direction inside the frame body 22. Specifically, the second partition portion 88 is formed in a tongue shape that extends in the Y direction and the Z direction with the X direction as the thickness direction. In addition, the second partition portion 88 is disposed at the central portion in the Y direction and is disposed opposite to the cable insertion portion 82 in the X direction.

[0076] The frame body 22 includes a pair of positioning portions 92 that project from the bottom wall portion 30 toward the Z direction side. The pair of positioning portions 92 function as portions for positioning the pair of cables 80 inside the frame body 22. Specifically, one positioning portion 92 is disposed on the Y direction side with respect to the second partition portion 88 and on the other side in the Y direction with respect to the cable engaging portion 28A of the first terminal 28T1. In addition, the other positioning portion 92 is disposed on the other side in the Y direction with respect to the second partition portion 88 and on the one side in the Y direction with respect to the cable engaging portion 28A of the second terminal 28T2. Further, the end portions on the Z direction side of the pair of positioning portions 92 project toward the X direction side with respect to the end portions on the other side in the Z direction.

[0077] (Structure of the cable 80)

[0078] As Figure 6 shown, as an example, the pair of cables 80 are configured such that a conductive component such as a copper wire is covered with a covering component having insulating properties. In addition, the portions of the pair of cables 80 that are respectively joined to the cable engaging portion 28A of the first terminal 28T1 and the cable engaging portion 28A of the second terminal 28T2 by welding are referred to as welding joint portions 80A. In the solder joint portion 80A, the covering component is removed. Here, one and the other of the pair of cables 80 are respectively referred to as the first cable 80C1 and the second cable 80C2.

[0079] As Figure 6 shown, the first cable 80C1 is inserted into the interior of the frame body 22 through the first communication hole 84H formed in the cable insertion portion 82. The portion 80B of the first cable 80C1 disposed inside the frame body 22 is laid along the end portion 86A on the inner side of the frame body 22 in the first partition wall portion 86 and is bent toward the other side in the Y direction. In addition, a part of the first cable 80C1 abuts against the positioning portion 92 in a state where the positioning portion 92 on the other side in the Y direction is disposed on the X direction side. Thereby, the state in which the welding joint portion 80A of the first cable 80C1 is located on the cable joint portion 28A of the second terminal 28T2 is maintained. In addition, the welding joint portion 80A of the first cable 80C1 is fixed (welded) to the cable joint portion 28A of the second terminal 28T2 via welding (not shown).

[0080] The second cable 80C2 is inserted into the interior of the frame body 22 through the second communication hole 84H2 formed in the cable insertion portion 82. The portion 80B of the second cable 80C2 disposed inside the frame body 22 is laid along the end portion 86A on the inner side of the frame body 22 in the first partition wall portion 86 and is bent toward one side in the Y direction. In addition, a part of the second cable 80C2 abuts against the positioning portion 92 in a state where the positioning portion 92 on the one side in the Y direction is disposed on the X direction side. Thereby, the state in which the welding joint portion 80A of the second cable 80C2 is located on the cable joint portion 28A of the first terminal 28T1 is maintained. In addition, the welding joint portion 80A of the second cable 80C2 is fixed (welded) to the cable joint portion 28A of the first terminal 28T1 via welding (not shown).

[0081] When viewed from the Z direction side, the portion 80B of the first cable 80C1 disposed inside the frame body 22 and the portion 80B of the second cable 80C2 disposed inside the frame body 22 cross in a region adjacent to the end portion 86A on the inner side of the frame body 22 in the first partition wall portion 86. In addition, the portion where the first cable 80C1 and the second cable 80C2 cross when viewed from the Z direction side is referred to as the crossing portion 90. In the crossing portion 90 of the first cable 80C1 and the second cable 80C2, the second cable 80C2 is disposed on the Z direction side with respect to the first cable 80C1.

[0082] The portion 80C of the first cable 80C1 disposed outside the frame body 22 and the portion 80C of the second cable 80C2 disposed outside the frame body 22 are in a state of being led out from the frame body 22 to one side in the X direction. The portion 80C of the first cable 80C1 disposed outside the frame body 22 and the portion 80C of the second cable 80C2 disposed outside the frame body 22 are twisted in a spiral shape with respect to each other. Thereby, it is difficult for the portion 80C of the first cable 80C1 disposed outside the frame body 22 and the portion 80C of the second cable 80C2 disposed outside the frame body 22 to be separated from each other.

[0083] (Structure of the control unit 102)

[0084] As Figure 8 shown, the control unit 102 functions as a current direction adjustment unit 103 that energizes the coil 24 by adjusting the current direction of the input alternating current. As Figure 9 shown, as an example, the control unit 102 is configured to include a CPU (Central Processing Unit: processor) 106, a ROM (Read Only Memory) 108, a RAM (Random Access Memory) 110, a storage 112, and an input / output interface (I / F) 114 for communicating with external devices, and they are connected via a bus 116 so as to be able to communicate with each other.

[0085] An actuator 10, a display unit such as a liquid crystal panel, and a vibration target unit 104 such as various controllers are electrically connected to the input / output interface 114. The CPU 106 is a central arithmetic processing unit that executes various programs to control the vibration of the actuator 10. Specifically, the CPU 106 reads control programs from the ROM 108 and the storage 112 based on signals from the vibration target unit 104, uses the RAM 110 as a work area to execute the control programs, and controls the vibration of the actuator 10. Thereby, the vibration of the actuator 10 is controlled, and the vibration of the vibration target unit 104 on which the actuator 10 is mounted is controlled.

[0086] (Functions and effects of the present embodiment)

[0087] Next, the functions and effects of the present embodiment will be described.

[0088] As Figures 1 to 6 shown, in the actuator 10 described above, the mover 14 is supported by the elastic support 16, and in a state where the coil 24 is not energized, the mover 14 is located at Figure 1The origin position shown. In the actuator 10 of the present embodiment, it is configured such that the coil 24 is fixed to the frame body 22, and the magnet 52 and the like are provided on the mover 14. Therefore, by energizing the coil 24 via the first cable 80C1, the second cable 80C2, the first terminal 28T1, and the second terminal 28T2, a thrust force, which is a reaction force generated from the coil 24, is generated in the mover 14. Further, by energizing the coil 24 with alternating current or the like, the mover 14 vibrates in the vertical direction along the center of gravity axis AX. In addition, the energization direction refers to the direction of the current flowing through the coil 24.

[0089] Here, the voltage applied between the coils 24 is referred to as the inter-coil applied voltage V C . Further, when the value of the inter-coil applied voltage V C is positive, the coil 24 is energized in one direction. In contrast, when the value of the inter-coil applied voltage V C is negative, the coil 24 is energized in the other direction. In addition, the state where the value of the inter-coil applied voltage V C is positive means a state where the potential of the second terminal 28T2 is higher than the potential of the first terminal 28T1. In addition, the state where the value of the inter-coil applied voltage V C is negative means a state where the potential of the first terminal 28T1 is higher than the potential of the second terminal 28T2.

[0090] By making the value of the inter-coil applied voltage V C positive, when the coil 24 is energized in one direction, a thrust force toward the Z-direction side is generated in the mover 14. At this time, the mover 14 is displaced so as to protrude from the mounting member 22. In other words, the mover 14 is displaced beyond the end portion on the side opposite to the bottom wall portion 30 of the mounting member 22 in the vibration direction of the mover 14. Further, by making the value of the inter-coil applied voltage V C negative, if the coil 24 is energized in the other direction, a thrust force toward the other side in the Z direction is generated in the mover 14.

[0091] Then, for example, when the control unit 102 detects that the user has touched the vibration target unit 104 by operating the vibration target unit 104 by the user, as Figure 10 shown, the control unit 102 acquires an alternating current in step S1. Next, the control unit 102 adjusts the direction of the alternating current acquired in step S1 in step S2, and supplies power to the coil 24 in step S3. That is, the control unit 102 applies the inter-coil applied voltage V Figure 11 as shown in "Input" in C ( Figure 11 the input voltage (InputVoltage) in Figure 11 ) between the coils 24, and starts energization of the coil 24.

[0092] In addition, Figure 11 the "Displacement [mm]" in Figure 11 is the displacement amount of the mover 14 from the origin position S. A positive value indicates the displacement amount to the side opposite to the bottom wall portion 30, and a negative value indicates the displacement amount to the bottom wall portion 30 side. Here, when starting the energization of the coil 24, the control unit 102 starts the energization in one direction of the coil 24 by applying a voltage between the coils 24 in the waveform indicated by "reverse" in Figure 11 Thus, a thrust to the Z-direction side is initially generated in the mover 14. In addition, in

[0093] In Figure 11 when a voltage V is applied between the coils 24 in the waveform indicated by "positive" and "reverse" between the coils 24, C the displacement amount of the mover 14 in the first pulse immediately after the mover 14 starts to move is small, and the displacement amount of the mover 14 gradually increases. After that, the displacement amount of the mover 14 gradually decreases. When Figure 11 a voltage V is applied between the coils 24 in the waveform indicated by "positive" in C and when Figure 11 a voltage V is applied between the coils 24 in the waveform indicated by "reverse" in C the maximum displacement amounts in the rising portions where the displacement amount of the mover 14 gradually increases are different. That is, in Figure 11 when a voltage V is applied between the coils 24 in the waveform indicated by "reverse", C the portion that becomes the maximum displacement amount in the rising portion where the displacement amount of the mover 14 gradually increases appears when the mover 14 is displaced to the side opposite to the bottom wall portion 30. On the other hand, when Figure 11 a voltage V is applied between the coils 24 in the waveform indicated by "positive" in C the portion that becomes the maximum displacement amount in the rising portion where the displacement amount of the mover 14 gradually increases appears when the mover 14 is displaced to the bottom wall portion 30 side.

[0094] Therefore, in the present embodiment, the control unit 102 controls the direction of the current flowing through the coil 24, and when a voltage V is applied between the coils 24 in the waveform indicated by "reverse", CApplied between the coils 24 such that when the mover 14 is displaced to the side opposite to the bottom wall portion 30, a portion of the maximum displacement amount of the rising portion where the displacement amount of the mover 14 gradually increases is formed, thereby suppressing the interference between the mover 14 and the bottom wall portion 30.

[0095] In other words, the current direction adjusting unit 103 controls the direction of the current supplied to the coil 24 so that the maximum displacement of the mover 14 is on the side opposite to the bottom wall portion 30. The control unit 102 controls the energization direction of the coil 24 so that the maximum displacement amount of the mover 14 from the origin position to the side opposite to the bottom wall portion 30 is greater than the maximum displacement amount of the mover 14 from the origin position to the bottom wall portion 30 side. The control unit 102 controls the energization direction of the coil 24 so that the initial movement of the mover 14 is displaced toward the bottom wall portion 30 side. That is, when the coil 24 is energized, the mover 14 is configured to be displaced toward the bottom wall portion 30 side in the initial operation.

[0096] That is, as Figure 12 shown, in the present embodiment, the control unit 102 controls the energization of the coil 24 so that the displacement amount D1 of the mover 14 from the origin position S to the bottom wall portion 30 side (the other side in the Z direction) is less than a specified displacement amount D2. In addition, the determined displacement amount D2 refers to the displacement amount at which the mover 14 starts to contact the bottom wall portion 30 when the mover 14 is displaced from the origin position S to the bottom wall portion 30 side.

[0097] As described above, in the vibration generating device 100 having the actuator 10 and the control unit 102 of the present embodiment, the control unit 102 controls the energization of the coil 24 so that the displacement amount D1 of the mover 14 from the origin position S to the bottom wall portion 30 side is less than the specified displacement amount D2. Thereby, it is possible to suppress the contact between the mover 14 and the mounting member 12 (the bottom wall portion 30 of the frame body 22).

[0098] In addition, in the present embodiment, when the control unit 102 applies the voltage V Figure 11 applied between the coils 24 at the frequency of the waveform shown, the displacement amount D3 of the mover 14 from the origin position S to the side opposite to the bottom wall portion 30 (the one side in the Z direction) is greater than the displacement amount D1 of the mover 14 from the origin position S to the bottom wall portion 30 side. This is achieved by the control unit 102 starting the energization of the coil 24 from the energization in one direction. Thereby, in the present embodiment, it is possible to ensure the displacement amount of the mover 14 in the Z direction and suppress the contact between the mover 14 and the mounting member 12. In addition, in the present embodiment, even when the voltage is applied to the coil 24 in one direction, the maximum value V C of the absolute value of the voltage applied to the coil 24 C1is the same as the maximum value V of the absolute value of the voltage applied to the coil 24 when the coil 24 is energized in the other direction, and it is also possible to suppress the movable element 14 from contacting the mounting member 12. C1 Also, in the present embodiment, an example is described in which the maximum value V of the absolute value of the voltage applied to the coil 24 when the coil 24 is energized in one direction

[0099] is the same as the maximum value V of the absolute value of the voltage applied to the coil 24 when the coil 24 is energized in the other direction. However, the present disclosure is not limited to this. For example, the absolute value of the voltage applied to the coil 24 may be variable. C1 is the same as the maximum value V of the absolute value of the voltage applied to the coil 24 when the coil 24 is energized in the other direction C1 However, the present disclosure is not limited to this. For example, the absolute value of the voltage applied to the coil 24 may be variable.

[0100] In addition, in the present embodiment, an example is described in which the control unit 102 starts energization of the coil 24 from energization in one direction. However, the present disclosure is not limited to this. For example, the control unit 102 may start energization of the coil 24 from energization in the other direction.

[0101] In addition, in the present embodiment, an example is described in which the displacement amount D3 of the movable element 14 from the origin position S to the side opposite to the bottom wall portion 30 (the Z-direction side) is larger than the displacement amount D1 of the movable element 14 from the origin position S to the bottom wall portion 30 side. However, the present disclosure is not limited to this. For example, the displacement amount D3 of the movable element 14 from the origin position S to the side opposite to the bottom wall portion 30 (the Z-direction side) may be the same as the displacement amount D1 of the movable element 14 from the origin position S to the bottom wall portion 30 side.

[0102] In addition, in the present embodiment, an example is described in which the voltage V applied between the coils C becomes a sine wave. However, the present disclosure is not limited to this. For example, as Figure 13 shown, the voltage V applied between the coils C may also become a pulse wave.

[0103] In addition, in the present embodiment, an example is shown in which the elastic support 16 is formed of a metal plate. However, the elastic support is not limited to being made of metal and may be made of resin (including elastomers) or cloth. In addition, the elastic support is not limited to being plate-shaped.

[0104] As described above, one embodiment of the present disclosure has been described. However, the present disclosure is not limited to the above, and of course, various modifications other than the above can be made without departing from the gist thereof.

[0105] The disclosure of Japanese Patent Application No. 2022-178975 filed on November 8, 2022 is incorporated herein by reference in its entirety.

Claims

1. An actuator having: A mounting member having a bottom wall portion and being open on a side opposite to the bottom wall portion; A coil, which is disposed inside the mounting member and fixed to the mounting member; and A mover, which has a magnet disposed opposite to the coil, is located at the origin position in a state where the coil is not energized, is displaced toward the bottom wall portion side by energizing the coil in one direction, and is displaced toward the side opposite to the bottom wall portion by energizing the coil in the other direction. When the mover is displaced toward the side opposite to the bottom wall portion, it can be displaced so as to protrude from the mounting member.

2. The actuator according to claim 1, wherein the displacement amount of the mover toward the side opposite to the bottom wall portion is larger than the displacement amount toward the bottom wall portion side.

3. The actuator according to claim 1, wherein the displaceable amount of the elastic support body, a part of which is fixed to the mounting member and another part of which is fixed to the mover, toward the bottom wall portion side is larger than the distance between the mover and the bottom wall portion.

4. The actuator according to claim 1, configured such that when the coil is energized, the initial movement of the mover is to displace toward the bottom wall portion side.

5. The actuator according to claim 1, wherein an opening is formed in the elastic support body, a part of which is fixed to the mounting member and another part of which is fixed to the mover.

6. A vibration generating device including: The actuator according to any one of claims 1 to 5; and A control unit, which controls the energization direction of the coil so that the maximum displacement amount of the mover from the origin position toward the side opposite to the bottom wall portion is more than the maximum displacement amount of the mover from the origin position toward the bottom wall portion side.

7. The vibration generating device according to claim 6, wherein the control unit controls the energization direction to the coil so that in the initial movement of the mover, the mover displaces toward the bottom wall portion side.

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