Vibration actuator and electronic device

Abstract

The present application provides a kind of vibration actuator and electronic equipment, can increase inertia without increasing size, produce suitable vibration.Vibration actuator has: movable body, with coil and coil winding magnetic core, the magnetic core extends in the winding axis direction of coil, and one end of the magnetic core and the other end of the magnetic core respectively protrude from the two ends of coil;Fixed body, with magnet;And shaft part, movable body is supported relative to fixed body rotatably at one end of the magnetic core side;In the vibration actuator, by the cooperation of magnet and the coil energized, movable body reciprocating rotary vibration relative to fixed body with shaft part as center, the vibration actuator is characterized in that, when not energized, magnet is oppositely arranged with at least the other end of one end of the magnetic core and the other end of the magnetic core in the extension direction of magnetic core, and magnet has two magnetic poles different in polarity side by side in the direction of reciprocating rotary vibration, counterweight part is arranged in the notch part or coil at the other end of the magnetic core side.

Description

Technical Field

[0001] This invention relates to a vibration actuator and an electronic device. Background Technology

[0002] Traditionally, electronic devices have incorporated vibration actuators that act as vibration generators. These actuators transmit vibrations to fingers, limbs, etc., to notify users of incoming messages, improve the feel of touchscreens, or enhance the immersive experience of gaming devices such as game console controllers. Furthermore, electronic devices include not only mobile communication terminals such as mobile phones and smartphones, mobile information terminals such as tablets, portable gaming terminals, and controllers (gamepads) for stationary game consoles, but also wearable devices worn on clothing, arms, etc.

[0003] Patent documents 1 to 3 disclose a vibration actuator comprising a fixed body with a coil and a movable body with a magnet. Vibration is generated by reciprocating motion of the movable body using the driving force of a voice coil motor composed of the coil and the magnet. These vibration actuators are linear actuators in which the movable body moves linearly along an axis, and are mounted with its vibration direction parallel to the main surface of the electronic device. Vibrations along the body surface direction are transmitted to the body surface of the user in contact with the electronic device.

[0004] Furthermore, as a vibration actuator, a vibration actuator that supports a movable body freely by being fixed on one side is known (see Patent Document 4).

[0005] In this vibration actuator, a movable body is formed by placing a cylindrical magnet inside a cup-shaped yoke on the top side of a leaf spring, whose base end is fixed to the fixed body. Furthermore, a coil is provided on the fixed body side, with its upper end located between the edge of the magnet and the yoke. By energizing the coil, the movable body vibrates.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2015-095943

[0009] Patent Document 2: Japanese Patent Application Publication No. 2015-112013

[0010] Patent Document 3: Japanese Patent No. 4875133

[0011] Patent Document 4: Japanese Patent Application Publication No. 2002-177882 Summary of the Invention

[0012] The problem the invention aims to solve

[0013] Compared to structures that support movable bodies at multiple locations with shafts or other means, single-sided fixed vibration actuators that support movable bodies freely by swaying in a unilaterally fixed manner can simplify the structure.

[0014] In this structure, to enhance the sense of vibration, it is necessary to increase the thrust, that is, to increase the G value representing the vibration. To do this, one possible approach is to increase the thickness of the magnet, that is, to increase the size of the magnet itself, in order to increase the magnetic flux in the magnetic circuit.

[0015] However, if only large, thick magnets are used, the yoke is prone to magnetic saturation, so the thickness of the yoke needs to be increased according to the thickness of the magnet.

[0016] When the dimensions of the magnet are predetermined, the dimensions of the corresponding movable parts are also greatly affected, resulting in reduced inertia and increased resonance point. Therefore, it is desirable to drive the magnet while ensuring sufficient magnetic properties, increasing inertia, and maintaining resonance point.

[0017] The purpose of this invention is to provide a vibration actuator and electronic device that can increase inertia and generate suitable vibrations without increasing size.

[0018] Solution to the problem

[0019] To achieve the above objectives, the vibration actuator of the present invention has the following structure: A movable body having a coil and a magnetic core wound around the coil, the magnetic core extending in the direction of the winding axis of the coil, and one end and the other end of the magnetic core protruding from both ends of the coil, respectively; A fixed body having a magnet; and A shaft portion, located at one end of the magnetic core, rotatably supports the movable body relative to the fixed body. Through the cooperation of the magnet and the energized coil, the movable body reciprocates and vibrates relative to the fixed body about the shaft. In this vibration actuator, When not energized, the magnet is positioned opposite at least one end of the magnetic core, along the extension direction of the magnetic core, and the magnet has two parallel magnetic poles of different polarities in the reciprocating rotational vibration direction. The magnetic core has a notch at the other end. A counterweight is fixed in the notch.

[0020] One embodiment of the vibration actuator of the present invention has the following structure, namely, having: A movable body having a coil and a magnetic core, one end of which protrudes from the two ends of the coil on which it is wound; A fixed body having a magnet; and A shaft portion, located at one end of the magnetic core, rotatably supports the movable body relative to the fixed body. Through the cooperation of the magnet and the energized coil, the movable body reciprocates in a rotary vibration, in this vibration actuator, When not energized, the magnet is positioned at least a distance apart from the other end, and the magnet has two parallel magnetic poles of different polarities in the direction of the reciprocating rotational vibration. The coil is equipped with a counterweight.

[0021] An electronic device according to one embodiment of the present invention has the following structure: it has a structure in which the above-mentioned vibration actuator is built in.

[0022] Invention Effects

[0023] According to the present invention, inertia can be increased and suitable vibrations can be generated without increasing the size. Attached Figure Description

[0024] Figure 1 This is a perspective view showing the external appearance of the vibration actuator according to Embodiment 1 of the present invention.

[0025] Figure 2 It is a three-dimensional view showing the state of the vibration actuator with its housing removed.

[0026] Figure 3 This is an exploded diagram showing the stationary and movable parts in a vibration actuator.

[0027] Figure 4 This is an exploded 3D view of the vibration actuator.

[0028] Figure 5 yes Figure 1 A sectional view along line AA.

[0029] Figure 6A and Figure 6B It is a sectional view used to illustrate a movable body.

[0030] Figure 7 This is a cross-sectional view showing the magnetic circuit of the vibration actuator.

[0031] Figure 8A , Figure 8B and Figure 8C It is a cross-sectional view showing the movement of a movable body.

[0032] Figure 9A and Figure 9BThis is a cross-sectional view showing the main structural components of a modified example 1 of the vibration actuator 1.

[0033] Figure 10 This is a partially exploded perspective view showing the main structural components of a modified example 2 of the vibration actuator 1.

[0034] Figure 11 yes Figure 10 CC-line sectional view.

[0035] Figure 12 This is a perspective view showing the external appearance of the vibration actuator according to Embodiment 2 of the present invention.

[0036] Figure 13 This is a three-dimensional diagram showing the vibration actuator with its outer casing removed.

[0037] Figure 14 It is an exploded diagram showing the state of a vibration actuator where the movable part has been removed from the stationary body.

[0038] Figure 15 This is an exploded 3D view of the vibration actuator.

[0039] Figure 16 It is an exploded three-dimensional view of the movable body of the vibration actuator.

[0040] Figure 17 This is an enlarged exploded view of the coil body.

[0041] Figure 18 This is an enlarged view showing the main structural parts of the coil.

[0042] Figure 19 yes Figure 13 A cross-sectional view in the direction of the arrow on the DD line.

[0043] Figure 20 This is a diagram showing the magnetic circuit of a vibration actuator.

[0044] Figure 21A , Figure 21B and Figure 21C It is a cross-sectional view showing the movement of a movable body.

[0045] Figure 22 This is a diagram of a gaming device, representing an example of an electronic device equipped with a vibration actuator.

[0046] Figure 23 This is a diagram showing a mobile information terminal as an example of an electronic device equipped with a vibration actuator.

[0047] Figure 24 This is a diagram showing a wearable terminal as an example of an electronic device equipped with a vibration actuator.

[0048] Explanation of reference numerals in the attached figures

[0049] 1. Vibration actuators: 1C, 100A, 100B, 100C, 100D

[0050] 10, 10A, 10B, 10C Movable bodies

[0051] 12, 12C coil

[0052] Magnetic cores 14, 14A, 14B, and 14C

[0053] 15, 15C Flexible Substrate

[0054] 16, 16C bushings (bearings)

[0055] 18, 18B winding spool

[0056] 18C coil winding spool

[0057] 20, 20C Fixation

[0058] 22, 22C base plate

[0059] 23, 23C shaft fixing part

[0060] 24, 24C casing

[0061] 30, 30C First Magnet

[0062] 32, 32C, 42, 42C Back Magnetic Yoke

[0063] 40, 40C Second Magnet

[0064] 50, 50C shaft section

[0065] 60, 60C Buffer Section

[0066] 61, 61C, 62, 62C cushioning materials

[0067] Counterweights for 80, 80A, and 80B

[0068] 80C Main counterweight (counterweight for notch)

[0069] 81B and 82B segmentation

[0070] 142, 142C, 152, 152C - One end

[0071] 144, 144C, 154, 154C (the other end)

[0072] 146, 146A, 146B, 146C magnetic cores

[0073] 147, 147B Extended Core (Central Shaft)

[0074] Notch sections 148, 148A, 148B, and 148C

[0075] Head of 149, 149B

[0076] 149C Free End

[0077] 156, 156C Bend

[0078] 181, 182, 184, 185 Winding spool dividers

[0079] Flanges 181a, 182a, 181b, and 182b

[0080] 181c, 182c Main body surface

[0081] 188C winding section

[0082] 201 Ministry of Communications

[0083] 202 Processing Department

[0084] 203 Drive Control Unit

[0085] 208 Inner circumferential surface

[0086] 241, 241C Upper surface

[0087] Side surface portion of 242, 242C, 243, 243C

[0088] 244, 244C One end surface

[0089] 245, 245C other end surface

[0090] Washers 282, 282C, 284, 284C

[0091] Magnetic poles 301, 301C, 302, 302C, 401, 401C, 402, 402C

[0092] 802, 804 Coil Side Counterweight (Counterweight Section)

[0093] 1420 and 1440 end surfaces

[0094] 1810 First winding bobbin segment

[0095] 1820 Second winding bobbin segment Detailed Implementation

[0096] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0097] (Implementation Method 1)

[0098] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0099] [Overall structure of vibration actuator 1]

[0100] Figure 1 This is a perspective view showing the external appearance of the vibration actuator according to Embodiment 1 of the present invention. Figure 2 This is a perspective view of the vibration actuator with its outer casing removed. Furthermore, Figure 3 This is an exploded view showing the stationary and movable parts in a vibration actuator. Figure 4 This is an exploded 3D view of the vibration actuator.

[0101] In this embodiment, an orthogonal coordinate system (X, Y, Z) is used for explanation. The same orthogonal coordinate system (X, Y, Z) is also used in the figures described later (as is the case in the figures used to explain variations 1 and 2). In the following text, the width, depth, and height of the vibration actuator 1 are the lengths in the X, Y, and Z directions, respectively. For convenience, the vibration actuator of this embodiment is... Figures 1 to 4 The X-direction is arranged laterally and described as the vibration direction. Furthermore, in this embodiment, the "axis of the movable body" refers to the Y-direction centered on the movable body. In this embodiment, the "axis of the movable body" is the same axis as the central axis of the coil. Alternatively, the X-direction and the negative X (-X) direction can be considered as the two sides, the positive side (+ side) of the Z-direction as the top side, and the negative side (- side) of the Z-direction as the bottom side.

[0102] like Figures 1 to 4 As shown, the vibration actuator 1 includes a movable body 10, a shaft portion 50, and a fixed body 20. The movable body 10 is supported on the fixed body 20 via the shaft portion 50.

[0103] The movable body 10 is rotatably supported on the fixed body 20, with the shaft portion 50 inserted and passing through at one end serving as a fulcrum, and reciprocating at the other end. In the vibration actuator 1, a counterweight portion 80 is included as part of the main body of the movable body 10. The counterweight portion 80 is configured to not detach from the notch portion that cuts away a part of the portion constituting the main body of the magnetic core 14.

[0104] The vibration actuator 1 is mounted in an electronic device, for example, such that the vibration transmission surface in contact with the user is parallel to the XY plane. For instance, in the case of a game controller, the vibration transmission surface is the surface in contact with the user's body surface, such as a finger (the surface with operation buttons, or the back surface where other fingers rest), while in the case of a smartphone or tablet, it is the touch panel surface. Furthermore, in wearable devices worn on the user's clothing, arm, etc., the sliding transmission surface is the outer surface in contact with the clothing or arm (…). Figure 24 Inner circumferential surface 208 shown).

[0105] In the vibration actuator 1, the movable body 10 has a coil 12 and a magnetic core 14 wound with the coil 12, and the fixed body 20 has magnets (a first magnet 30 and a second magnet 40).

[0106] The movable body 10 is movably supported on the fixed body 20 by a magnetic spring generated by the attraction of the magnets (first magnet 30 and second magnet 40). In this embodiment, the movable body 10 is movably supported on the fixed body 20 around the shaft portion 50 by a magnetic spring composed of the magnets (first magnet 30 and second magnet 40), the coil 12 and the magnetic core 14.

[0107] [Shaft 50]

[0108] Figure 5 yes Figure 1 A sectional view along line AA.

[0109] Figures 2 to 5 The shaft 50 shown supports the movable body 10 in a manner that allows it to rotate back and forth about the axis relative to the fixed body 20, i.e., it can vibrate freely.

[0110] The shaft portion 50 can be made of either a non-magnetic material or a magnetic material. In this embodiment, the shaft portion 50 is made of a magnetic material such as SUS420J2.

[0111] The shaft portion 50 is mounted between the base plate 22 and the upper surface portion 241, which are arranged opposite each other to clamp the movable body 10. The upper surface portion 241 also functions as a cover, which is the outer shell 24. A washer 282 mounted on the shaft portion 50 is located between the upper surface portion 241 of the outer shell 24 and the movable body 10, and a washer 284 mounted on the shaft portion 50 is located between the base plate 22 and the movable body 10. Through these washers 282 and 284, the shaft portion 50 supports the movable body 10 in a manner that allows for smooth reciprocating rotation relative to the fixed body 20.

[0112] [10 movable parts]

[0113] The movable body 10 is a component with a counterweight 80 on its top side. For example, by fixing the counterweight 80 to a part of the movable body, inertia is increased in a state that does not saturate the magnetic flux, affect the magnetic spring constant and torque. The movable body 10 will be described in detail below.

[0114] In the movable body 10, the coil 12 is wound on the magnetic core 14 via the coil winding spool 18. The magnetic core 14 extends from one end to the other end and constitutes the main body of the movable body.

[0115] The movable body 10 has a bushing (bearing) 16, which serves as a bearing, provided on one end of the magnetic core 14, and a counterweight 80 provided on the other end (top end).

[0116] The magnetic core 14 is a magnetic body that extends along the coil axis of the coil 12 and is magnetized by energizing the coil 12. The magnetic core 14 is disposed between the base plate 22 and the upper surface portion 241 of the outer casing 24 at predetermined intervals. Here, the predetermined interval refers to the space constituting the movable range of the movable body 10. The magnetic core 14 extends along the winding axis of the wound coil 12. One end 142 and the other end 144 protrude from both sides of the coil 12 within the magnetic core 14.

[0117] The magnetic core 14 can be a ferrite core. Alternatively, the magnetic core 14 can also be made of electromagnetic stainless steel, sintered materials, MIM (Metal Injection Molding) materials, laminated steel sheets, electro-galvanized steel sheets (SECC (Steel Electrolytic Cold Commercial), specific gravity 7.85), etc.

[0118] The magnetic core 14 extends in a direction orthogonal to the axial direction of the shaft portion 50. A bushing 16 is inserted into a through hole formed at one end of the magnetic core 14, and the magnetic core 14 rotates through the shaft portion 50 inserted into and passing through the bushing 16. The other end of the magnetic core 14 is a free end, and vibrates in a direction orthogonal to the extending direction of the base plate 22, which serves as the fixing body 20, and the upper surface portion 241 of the outer casing 24, which is in this case, in the X direction.

[0119] The magnetic core 14 is arranged from one end 142 to the other end (top end side) in the order of shaft 50, coil 12, and the other end 144 that constitutes the free end.

[0120] The bushing 16, located at one end 142 of the magnetic core 14, is cylindrical, allowing the movable body 10 to rotate around the inserted and penetrated shaft 50. It can be made of any material, such as metal or resin. If the shaft 50 is magnetic, the bushing 16 is preferably made of a non-magnetic material. Alternatively, if the shaft 50 is non-magnetic, the bushing 16 can be magnetic. In this way, if either the shaft 50 or the bushing 16 is non-magnetic, the magnetic flux through the magnetic core 14 will not pass between the shaft 50 and the bushing 16, and friction will not increase between them due to magnetic attraction.

[0121] In other words, no friction caused by magnetic attraction is generated between the bushing 16 and the shaft portion 50 inserted into and passing through the bushing 16, allowing the movable body 10 to rotate smoothly. For example, the shaft portion 50 may use a durable magnetic shaft (e.g., SUS420J2), and the bushing 16 may use a copper-based sintered bearing to form the vibration actuator 1. Thus, unwanted magnetic attraction can be suppressed when driving the movable body 10, and the movable body 10 can be held with low friction. In other words, wear caused by driving the movable body 10 can be suppressed, achieving a highly reliable vibration actuator 1.

[0122] In addition, one end 142 of the magnetic core 14 is fixed to one end 152 of the flexible substrate 15, and both ends of the coil 12 are connected to the circuit of the flexible substrate 15.

[0123] The flexible substrate 15 supplies power to the coil 12, and in this embodiment, it is configured to connect the movable body 10 to the fixed body 20.

[0124] The flexible substrate 15 has one end 152 connected to the coil 12 of the movable body 10, another end 154 fixed to the side of the fixed body 20, and at least one flexible bending portion 156 located between the one end 152 and the other end 154, which conducts from one end to the coil 12. The bending portion 156 is sandwiched between the one end 152 and the other end 154 and has flexibility to deform in response to the vibration of the movable body 10. The bending portion 156 is flexible in a direction orthogonal to the axial direction of the shaft portion 50.

[0125] Coil 12 is a coil that enables the movable body 10 to move when energized, and magnetizes the magnetic core 14 when energized, specifically magnetizing one end 142 and the other end 144 into magnetic poles. Coil 12 changes the polarity of the two ends (one end 142 and the other end 144) of the magnetic core 14 by switching the direction of energization.

[0126] Between one end 142 and the other end 144 of the magnetic core 14, there is a core portion 146 that connects one end 142 and the other end 144 of the magnetic core 14. The core portion 146 is a part whose shape is smaller than that of one end 142 and the other end 144, and a coil winding spool 18 (winding spool dividers 181, 182) on which the coil 12 is wound is externally mounted.

[0127] The coil winding spool 18 is composed of winding spool segments 181 and 182. Each of the winding spool segments 181 and 182 is externally mounted and fixed in such a way that it surrounds the magnetic core portion 146 in the circumferential direction. The winding spool segments 181 and 182 can be made of resin materials such as polyamide resin, liquid crystal polymer, and polyphenylene sulfide resin (PPS resin).

[0128] The movable body 10 has a cuboid shape with a relative width decreasing from one end 142 to the other end 144, as the coil 12 is wound onto the magnetic core 14 via the coil winding spool 18. The winding axis of the coil 12 is the coil axis, which is also the central axis of the core 146. The direction of the winding axis of the coil 12 is the direction of the coil axis, which is the direction of extension of the magnetic core 14.

[0129] By energizing and exciting the coil 12, the end surfaces 1420 and 1440 (refer to) located in the axial direction of the coil 12 at the base end and top end of the magnetic core 14, i.e., one end 142 and the other end 144, are energized. Figure 5 The length center of the vibration direction (X direction) becomes the center of the magnetic pole.

[0130] In the movable body 10, the magnetic pole center of the movable body 10 is located on the coil shaft of the coil 12 and at the center of the magnetic core 146.

[0131] The other end 144 is shaped such that the top end of the magnetic core 146 in the magnetic core 14 protrudes radially about the axis of the magnetic core 146. A counterweight 80 is provided in the other end 144.

[0132] Figure 6A , Figure 6B It is a diagram used to illustrate movable bodies. Figure 6A This is a longitudinal sectional view used to illustrate a movable body. Figure 6B yes Figure 3 BB line section view.

[0133] like Figures 4 to 6B As shown, the other end 144 has a notch 148 with a portion of the magnetic core 14 cut off. A counterweight 80 is installed in the notch 148, which may be a slot or a hole.

[0134] The notch 148 is formed as a concave shape with openings at two locations in a direction parallel to the extending direction of the shaft 50, and the counterweight 80 is installed in the concave shape to fill it. Through the notch 148, the magnetic core 14 (here, the other end 144) has an extended core 147, which includes the shaft of the magnetic core 14, which is the center of the other end 144, and is continuous with the magnetic core 146.

[0135] The notch 148 is configured such that the other end 144 has a thickness L1 in the extending direction of the magnetic core 14, preventing magnetic saturation of the head 149 constituting the free end. Furthermore, in the other end 144, the extended core 147, located on the extension line of the core 146 and serving as the portion clamped by the counterweight 80, has a thickness L2 that is proportional to the overall thickness of the other end 144. The notch 148 is configured such that the cross-section of the core 147 in the other end 144 has a proportional area, and the core 147 extends in the extending direction of the magnetic core 14. This structure prevents a decrease in magnetic properties and a reduction in magnetic flux.

[0136] In the magnetic core 14, the counterweight 80 is fixed in the concave notch 148 in such a way that even if centrifugal force is generated due to the rotation of the movable body 10, i.e., the magnetic core 14, the counterweight 80 will not detach from the magnetic core 14. For example, the other end 144 of the magnetic core 14 can hold the counterweight 80 in the notch 148, or it can be fixed by pressing the counterweight 80 into the notch 148, or it can be fixed by means of adhesive, welding, etc.

[0137] The notch 148 is formed to match the shape of the counterweight 80, making it less likely for the counterweight 80 to detach from the other end 144. In this embodiment, the notch is formed in a box shape, and correspondingly, the counterweight 80 is formed in a cuboid shape.

[0138] The counterweight 80 is a component used to adjust the weight of the movable body 10 and is made of a high-density material. The counterweight 80 is preferably made of a material with a specific gravity at least twice that of the electroplated galvanized steel sheet (SECC, specific gravity 7.85) used in the magnetic core 14 (e.g., a specific gravity of approximately 16 to 19), and tungsten can be used for example. Therefore, even if the external dimensions of the movable body 10 are set during the design process, the mass of the movable body 10 can be increased relatively easily, achieving the desired vibration output without saturating the magnetic flux or affecting the magnetic spring constant and torque.

[0139] [Fixed body 20]

[0140] The fixed body 20 supports the movable body 10 rotatably via the shaft 50.

[0141] In addition to the magnets (first magnet 30 and second magnet 40), the fixture 20 also has a base plate 22 and a housing 24. The fixture 20 further has a buffer section (buffer material) 60.

[0142] The base plate 22 is formed of a plate-shaped material such as steel plate (a rectangular plate in this embodiment). In this embodiment, the base plate 22 constitutes one side surface (the bottom surface) of the vibration actuator 1.

[0143] A housing 24 is mounted on the base plate 22 in a covering manner, and the base plate 22 and the housing 24 together constitute a cover, which movably accommodates the movable body 10. In this embodiment, the cover is formed into a hollow cuboid shape. A shaft portion 50 is fixed at one end of the cover in the longitudinal direction along a direction orthogonal to the vibration direction of the movable body 10. The upper surface portion 241 of the housing 24 forms another side surface opposite to one side surface of the vibration actuator 1.

[0144] A shaft portion 50 is erected on one end of the base plate 22 via a shaft fixing portion 23. A movable body 10 is arranged opposite to it at a distance above the base plate 22. Furthermore, a first magnet 30 is arranged opposite to one end surface of one end 142 of the movable body 10 at one end of the base plate 22, and a second magnet 40 is arranged opposite to the end surface (top surface) of the other end 144 of the movable body 10 at the other end of the base plate 22. Although a structure with a first magnet 30 is used in this embodiment, the first magnet 30 can be omitted, and a structure with only the second magnet 40 can be used.

[0145] The outer shell 24 is fixed to the base plate 22 in such a way that it covers the movable body 10 opposite to the base plate 22.

[0146] The upper surface portion 241 of the outer casing 24, which is opposite to the base plate 22 in height (Z direction), has the other end of the shaft portion 50 fixed to it via a shaft fixing portion (not shown).

[0147] The outer casing 24 is formed as a box shape (in this embodiment, a square box shape) with an opening on the side of the base plate 22. In the outer casing 24, the upper surface portion 241 is provided with a shaft portion 50 between it and the base plate 22. The outer casing 24 has two side surface portions 242 and 243 that are arranged opposite each other at a distance in the vibration direction of the movable body 10, for example, in the width direction (X direction), and a one end surface portion 244 and a other end surface portion 245 that are spaced apart at a distance in the extension direction of the movable body 10 (here, the depth direction (Y direction)).

[0148] There are no particular restrictions on the size of the cover formed by mounting the outer shell 24 onto the base plate 22, but in this embodiment, it is configured as a cuboid shape with the longest depth among the width (X direction), depth (Y direction), and height (Z direction).

[0149] Alternatively, the outer shell 24 and the base plate 22 can be formed together from a conductive material such as a plate-shaped material (a rectangular plate in this embodiment) like steel. Thus, the base plate 22 and the outer shell 24 can function as an electromagnetic barrier.

[0150] In addition, on the two side surfaces 242 and 243 of the outer casing 24, buffer portions 60 (buffer materials 61 and 62) that contact the free end of the vibrating movable body 10 are respectively provided at their other end sides.

[0151] When the movable body 10 vibrates, the buffer 60 transmits the vibration of the movable body 10 to the cover of the vibration actuator 1 by contacting the other end 144 of the movable body 10 (see reference). Figures 8A to 8C Therefore, the buffer section 60 can cause the cover to vibrate significantly.

[0152] The buffer portion 60 is formed of a soft material such as an elastomer, silicone rubber, resin, or a porous elastomer (e.g., sponge). In this embodiment, the buffer portion 60 is a buffer material 61, 62 provided on the two side surfaces 242, 243 that serve as the cover side. Alternatively, the buffer portion 60 may be provided on one side of the movable body 10, for example, the other end 144 of the free end of the movable body 10, so that when the movable body 10 vibrates, the movable body 10 contacts the side surfaces 242, 243 through the buffer portion 60. When the buffer portion 60 is an elastomer, the generation of sound or vibration noise when the other end 144 of the magnetic core 14 of the movable body 10 contacts the side surfaces 242, 243 can be reduced when the movable body 10 is driven.

[0153] Furthermore, when the buffer portion 60 is made of silicone rubber, the generation of sound or vibration noise when the other end 144 of the magnetic core 14 of the movable body 10 contacts the side surfaces 242 and 243 can be reduced. Moreover, when the buffer portion 60 is made of silicone rubber, its thickness does not exhibit individual differences compared to an elastomer formed from a sponge-like material containing internal air bubbles. Therefore, the thickness of the buffer portion 60 can be easily managed to achieve the desired thickness, ensuring the stability of the characteristics of the buffer portion 60.

[0154] The magnets (first magnet 30 and second magnet 40) enable the movable body 10 to move through cooperation with the coil 12. The magnets function as magnetic springs by exerting a magnetic attraction on the movable body 10. In this embodiment, the magnets and the magnetic core 14 wound with the coil 12 together form a magnetic spring that can freely support the movable body 10.

[0155] The magnet is arranged relative to coil 12 in the axial direction of coil 12.

[0156] In this embodiment, the magnet has a first magnet 30 and a second magnet 40. The first magnet 30 is opposite to one end of the magnetic core 14 at a distance spaced apart in the axial direction of the coil 12, and the second magnet 40 is opposite to the other end of the magnetic core 14 at a distance spaced apart in the axial direction of the coil 12.

[0157] The first magnet 30 and the second magnet 40 are magnetized toward the magnetic core 14 (movable body 10). In this embodiment, the magnetization directions of the first magnet 30 and the second magnet 40 are parallel to the axial direction of the coil 12. The first magnet 30 and the second magnet 40 have two different magnetic poles arranged side by side in a direction orthogonal to the extending direction of the shaft 50 (corresponding to the vibration direction of the movable body 10), and these two magnetic poles are respectively the surfaces opposite to the magnetic core 14.

[0158] The magnet is positioned such that the center of the magnetic core 14 of the movable body 10 (which is the axis of the coil 12, equivalent to the center of the magnetic pole when the coil 12 is energized) is located opposite to the boundary of the magnetic pole, i.e., the switching position of the magnetic pole.

[0159] The polarities of the magnetic poles of the first magnet 30 and the second magnet 40 are magnetized such that the torque generated by energizing the coil 12 of the movable body 10 is produced in the same rotational direction of the movable body 10.

[0160] For example, such as Figure 5 and Figure 6A , Figure 6B As shown, in the first magnet 30 and the second magnet 40, the magnetic poles 301 and 401 disposed on the side surface portion 242 and opposite to the movable body 10 are formed to be the same magnetic pole ( Figure 5 (The middle one is the S pole). Furthermore, in the first magnet 30 and the second magnet 40, the magnetic poles 302 and 402 disposed on the side surface portion 243 and opposite to the movable body 10 are formed to be the same magnetic pole ( Figure 5 (The middle is the N pole).

[0161] The back of the first magnet 30 is attached with a back magnetic yoke 32, and the back of the second magnet 40 is attached with a back magnetic yoke 42, in order to increase the magnetic attraction of each magnet 30 and 40.

[0162] For example, suppose that in the first magnet 30 and the second magnet 40, the side surface portion 242 is magnetized as the S pole and the side surface portion 243 is magnetized as the N pole. In this case, when the coil 12 is not energized, as... Figure 7As shown, the first magnet 30 and the second magnet 40 respectively generate magnetic flux emanating from the N pole and incident on the S pole. When not energized, one end 142 of the magnetic core 14 wound with the coil 12 is attracted by both the S and N poles of the first magnet 30, and is held at the switching position between different magnetic poles 301 and 302 (S pole and N pole). In addition, the other end 144 of the magnetic core 14 is attracted by both the S and N poles of the second magnet 40, and is held at the switching position between different magnetic poles 401 and 402 (S pole and N pole). Together with the magnetic core 14, which is a magnetic body of the movable body 10, the first magnet 30 and the second magnet 40 function as magnetic springs through the magnetic attraction generated between them and the magnetic core 14, and movably support the movable body 10.

[0163] The other end 154 of the flexible substrate 15, which is connected to the coil 12 at one end 152, is fixed to the side surface portion 243.

[0164] One end 152 of the flexible substrate 15, connected to the coil 12, is fixed to one end of the movable body 10, and the other end 154 is fixed to the fixed body 20, here the side surface portion 243. The other end 154 is fixed to the side surface portion 243 in such a way that it is partially exposed on the outer surface of the cover. When the movable body 10 is movable, the range of motion near the shaft portion 50 is smaller than the range of motion of the portion on the other end side of the movable body 10. As a result, the load applied to the bending portion 156 in the flexible substrate 15 disposed near the shaft portion 50 is smaller. Thus, since the flexible substrate 15 is fixed near the shaft portion 50, the displacement of the flexible substrate 15 can be minimized, and breakage caused by stress generated during movement can be prevented.

[0165] Furthermore, in the flexible substrate 15, for example, an elastic component such as an elastic adhesive or elastic adhesive tape can be placed between one end 152 and the movable body 10 to absorb the impact of vibration.

[0166] [Magnetic circuit of vibration actuator 1]

[0167] Figure 7 This is a diagram showing the magnetic circuit of the vibration actuator, indicating the state of the vibration actuator 1 as viewed from the positive side (upper side) of the Z direction to the negative side (lower side) of the Z direction. Figures 8A to 8C It is a plan view showing the movement of the movable body, showing the state of the vibration actuator 1 as viewed from the positive side (top) in the Z direction to the negative side (bottom) in the Z direction. Figure 8A This indicates the state of the movable body 10 when it is not powered on (reference state). Figure 8B This indicates the state of the movable body 10 when viewed from the top end of the movable body 10, that is, from the other end 144 of the magnetic core 14, when the vibration actuator 1 is energized to the coil 12 in a clockwise direction. Figure 8CThis indicates the state of the movable body 10 when viewed from the top end of the movable body 10, i.e. from the other end 144 of the magnetic core 14, when the coil 12 is energized in a counterclockwise direction.

[0168] In the vibration actuator 1, the movable body 10 is positioned between the base plate 22 and the outer casing 24 of the fixed body 20, with one end supported by the shaft portion 50. Furthermore, magnets (first magnet 30 and second magnet 40) are positioned opposite the two ends (one end 142 and the other end 144) of the magnetic core 14 on which the coil 12 is wound, with their two different magnetic poles facing the coil 12. The magnetic poles 301 of the first magnet 30 and 401 of the second magnet 40 are the same, and the magnetic poles 302 of the first magnet 30 and 402 of the second magnet 40 are the same.

[0169] In each of the first magnet 30 and the second magnet 40, two different magnetic poles 301 and 302, and 401 and 402 are arranged side by side in a vibration direction (X direction) orthogonal to the axial direction of the shaft 50.

[0170] The movable body 10 is powered by a power supply unit (e.g., via a flexible substrate 15). Figures 22 to 24 The drive control unit 203 shown energizes the coil 12, causing it to reciprocate in the X direction, i.e., in the direction of contact and separation from the side surfaces 242 and 243 of the housing 24.

[0171] Specifically, the other end of the movable body 10 is rocked. As a result, the vibration output of the vibration actuator 1 is transmitted to the user of the electronic device having the vibration actuator 1.

[0172] In the vibration actuator 1, a Figure 7 The magnetic circuit shown.

[0173] In the vibration actuator 1, when the coil 12 is not energized, that is, in the reference state, the two ends (one end 142 and the other end 144) of the magnetic core 14 with the coil 12 wound around it are attracted by the first magnet 30 and the second magnet 40, respectively.

[0174] The center of the length (length of the vibration direction) orthogonal to the axial direction of the magnetic core 14 and its two ends (one end 142 and the other end 144) is located opposite to the switching position of the magnetic poles of the magnet. Furthermore, the center of the length (length of the vibration direction) orthogonal to the axial direction of the two ends (one end 142 and the other end 144) is located on the same axis as the axis of the coil 12.

[0175] Specifically, one end 142 of the magnetic core 14 is attracted by the magnetic attraction between the different magnetic poles 301 and 302 of the first magnet 30 and remains at the switching position of the magnetic poles 301 and 302.

[0176] In addition, the other end (free end) 144 of the magnetic core 14 is attracted by the magnetic attraction between the different magnetic poles 401 and 402 of the second magnet 40 and remains at the switching position of the magnetic poles 401 and 402.

[0177] In this way, the movable body 10 is held in the reference state only by the magnetic spring formed by the first magnet 30 and the second magnet 40 of the fixed body 20.

[0178] In the vibration actuator 1, the coil 12 is configured such that it is along the magnetic flux from the first magnet 30 and the second magnet 40 and is spaced apart from the first magnet 30 and the second magnet 40.

[0179] Through this structure, such as Figure 7 and 8B As shown, when energized, the current flowing in the coil 12 magnetizes the two ends (one end 142 and the other end 144) of the magnetic core 14, forming different magnetic poles. Specifically, one end 142 is magnetized as the N pole, and the other end 144 is magnetized as the S pole.

[0180] As a result, one end 142 is attracted by the magnetic pole 301 of the first magnet 30 and repelled by the magnetic pole 302 of the first magnet 30, generating a thrust f and moving in the direction of the thrust f. On the other hand, the other end 144 repels the magnetic pole 401 of the second magnet 40 and is attracted by the magnetic pole 402 of the second magnet 40, moving in the direction of the thrust f.

[0181] like Figure 8B As shown, by energizing the coil 12, the two ends (one end 142 and the other end 144) located at the position clamping the shaft 50 in the vibration actuator 1 move in the directions of thrust f and -F, respectively, thereby generating a thrust -M in the same direction of rotation. As a result, the movable body 10 rotates about the shaft 50 in the direction of thrust -M, and the other end 144 of the movable body 10 moves toward the side surface 243, and comes into contact with the side surface 243, i.e., the cover, via the buffer material 62 (specifically, through collision), applying vibration to the cover.

[0182] Furthermore, when the energizing direction of coil 12 is switched to the opposite direction, such as... Figure 8CWhen energized, opposing forces -f and F are generated. Specifically, one end 142 is magnetized as the S pole, and the other end 144 is magnetized as the N pole. Thus, end 142 repels the magnetic pole 301 of the first magnet 30 and is attracted by the magnetic pole 302 of the first magnet 30, generating a force -f and moving in the direction of force -f. On the other hand, the other end 144 is attracted by the magnetic pole 401 of the second magnet 40 and repels the magnetic pole 402 of the second magnet 40, moving in the direction of F.

[0183] like Figure 8C As shown, by energizing the coil 12, the two ends (one end 142 and the other end 144) located at the position clamping the shaft 50 in the vibration actuator 1 move in the thrust-f and F directions respectively, thereby generating a thrust M in the same rotational direction. As a result, the movable body 10 rotates about the shaft 50 in the thrust M direction, and the other end 144 of the movable body 10 moves toward the side surface 242 opposite to the side surface 243, and comes into contact with the side surface 242, i.e., the cover, via the buffer material 61 (specifically, through collision), applying vibration to the cover.

[0184] In the vibration actuator 1, instead of using elastic components such as leaf springs, a magnetic spring employing a magnet (at least a second magnet 40) and a magnetic core 14 is used to freely support the movable body 10 by reciprocating vibration about the shaft 50 relative to the fixed body 20.

[0185] Thus, unlike conventional vibration actuators that freely support movable bodies through the vibration of metal springs, this design can prevent damage caused by metal fatigue or impact, which are inherent defects of metal springs.

[0186] Furthermore, the shaft portion 50 supports the movable body 10 freely at one end 142 of the magnetic core 14, and a counterweight 80 made of a high-density material is installed in the notch portion 148, where a portion of the other end 144 of the magnetic core 14 has been cut off. The counterweight 80 is provided in the notch portion 148 in such a way that its movement in the vibration direction within the notch portion 148 is restricted. Thus, the counterweight 80 is provided in the movable body 10 as part of the magnetic core 14 that constitutes the entire length of the movable body body 10, while being surrounded on all four sides in the direction of movement when the movable body 10 reciprocates and rotates.

[0187] In other words, the mass of the top part (other end) of the movable body 10 can be increased without changing the size of the movable body 10 and without the counterweight 80 detaching from the movable body 10. Thus, in the vibration actuator 1, inertia can be increased without lowering the resonance point while maintaining the magnetic properties.

[0188] Furthermore, in this embodiment, magnets, namely the first magnet 30 and the second magnet 40, are disposed on both sides of the magnetic core 14. The two magnetic poles 301 and 302, and 401 and 402 of each magnet are arranged such that the torque generated at each end 142, 144 of the movable body 10 is generated in the same rotational direction. The two ends (one end 142, the other end 144) of the magnetic core 14 generate magnetic attraction with the first magnet 30 and the second magnet 40, and attract each other.

[0189] Therefore, when the movable body 10 is movable through the cooperation of the first magnet 30 and the second magnet 40 with the coil 12, the load generated by the magnetic attraction force applied to the shaft 50 is canceled, and the load applied to the shaft 50 and the bushing 16 can be reduced.

[0190] Furthermore, since the movable body 10 is in contact with the side surfaces 242 and 243 of the cover (in a state equivalent to contact), it can directly transmit vibration to the vibration actuator cover, causing the vibration actuator 1 to generate a large vibration. In addition, since the movable body 10 is in contact with the fixed body 20 (cover) during vibration, the vibration amount also becomes constant, and the vibration actuator 1 can achieve stable vibration output.

[0191] Furthermore, the other end 144 of the magnetic core 14, which is the free end of the movable body 10, is formed such that its thickness decreases in the X direction towards the free end. Therefore, when the other end 144 swings and comes into contact with the cushioning materials 61 and 62, the movable body 10 has a larger range of motion compared to the case where the other end 144 of the magnetic core 14, which is the free end of the movable body 10, has the same thickness in the X direction towards the free end. Thus, the vibration actuator 1 can ensure a larger vibration output.

[0192] Furthermore, according to the vibration actuator 1, the inner wall surface (side surface portions 242, 243) of the housing 24 is provided with a buffer portion 60, which contacts the movable body 10 via the buffer portion 60 (buffer material 61, 62). The buffer portion 60 can mitigate the impact when the movable body 10 vibrates and contacts the base plate 22 or the housing 24, reducing the generation of contact sound and vibration noise, while transmitting the vibration to the user. In addition, each time it vibrates, since the movable body 10 alternately contacts (specifically collides) the base plate 22 and the housing 24 via the buffer portion 60, the vibration output is amplified. As a result, the user can feel a vibration output that is greater than the actual vibration output generated by the movable body 10.

[0193] Here, the vibration actuator 1 is powered from the power supply unit (e.g., via the flexible substrate 15) Figures 22 to 24The drive control unit 203 shown inputs an AC wave to the coil 12. That is, the energizing direction of the coil 12 is switched periodically, and the thrust M on the positive side of the X direction and the thrust -M on the negative side of the X direction act alternately on the movable body 10. As a result, the other end of the movable body 10 vibrates in an arc shape in the XY plane.

[0194] The driving principle of the vibration actuator 1 will be briefly explained below. In the vibration actuator 1 of this embodiment, the moment of inertia (inertia) of the movable body 10 is set as J[kg]. m 2 Let the spring constant for the torsional direction of the magnetic spring be K. sp In the case where the movable body 10 resonates with the fixed body 20 at the resonant frequency f calculated according to the following formula (1). r [Hz] vibration.

[0195] [Formula 1] …(1) f r Resonant frequency [Hz] J: Moment of inertia [Kgm] 2 ] K sp Spring constant [Nm / rad] Since the movable body 10 constitutes the mass part in the vibration model of the spring-mass system, the frequency is equal to the resonant frequency f of the movable body 10. r When an alternating current wave is input to coil 12, the movable body 10 enters a resonant state. In other words, by means of a power supply unit (e.g., ... Figures 22 to 24 The drive control unit 203 shown inputs a frequency to the coil 12 that is approximately equal to the resonant frequency f of the movable body 10. r The alternating waves can efficiently cause the movable body 10 to vibrate.

[0196] The motion equations and circuit equations representing the driving principle of the vibration actuator 1 are shown below. The vibration actuator 1 is driven based on the motion equation shown in equation (2) and the circuit equation shown in equation (3).

[0197] [Equation 2] …(2) J: Moment of inertia [Kgm] 2 ] θ(t): Angle [rad] K t Torque constant [Nm / A] i(t): Current [A] K sp Spring constant [Nm / rad] D: Damping coefficient [Nm / (rad / s)] [Formula 3] …(3) e(t): Voltage [V] R: Resistance [Ω] L: Inductance [H] K e Back electromotive force constant [V / (rad / s)] In other words, within the range that satisfies formula (2), the moment of inertia (inertia) J [kg·m2], rotation angle θ (t) [rad], and torque constant K of the movable body 10 in the vibration actuator 1 can be appropriately changed. t [N·m / A], current i(t) [A], spring constant K sp [N·m / rad], damping coefficient D [N·m / (rad / s)], etc. Furthermore, within the range satisfying equation (3), the voltage e(t) [V], resistance R [Ω], inductance L [H], and back electromotive force constant K can be appropriately changed. e [V / (rad / s)].

[0198] Thus, in the vibration actuator 1, when the moment of inertia (inertia) J of the movable body 10 and the spring constant K of the magnetic spring are applied, the vibration actuator 1 is activated. sp The determined resonant frequency f r When the AC wave is energized to the coil 12, it can effectively obtain a large vibration output.

[0199] <Variation Example 1>

[0200] Figure 9A , Figure 9B This is a cross-sectional view showing the main structural components of a modified example 1 of the movable body of the vibration actuator in Embodiment 1. More specifically, Figure 9A This is a longitudinal sectional view of the movable body used to illustrate the movable body in modified example 1. Figure 9B This is a cross-sectional view of the other end of the magnetic core of a modified example 1 of the vibration actuator, showing the relationship with... Figure 3 The same part shown in the BB line section view.

[0201] Figure 9A , Figure 9B In the movable body 10A of the modified example 1 of the vibration actuator shown, the shape of the counterweight 80A provided on the other end (top part) 144A of the magnetic core 14A is changed compared with the movable body of the vibration actuator 1.

[0202] In other words, in the movable body 10A, in the structure of the vibration actuator 1, the notch 148A provided in the other end 144A of the magnetic core 14A is a through hole that extends through the Z direction, and a counterweight 80A is installed in the through hole.

[0203] exist Figure 9A , Figure 9B In the movable body 10A of the modified example 1, a magnetic core 14A with the same structure as the magnetic core 14 is inserted into a shaft-supplying portion 50 (see reference 142A). Figure 2 The bushing 16 is inserted, and a counterweight 80A is provided on the other end 144A side.

[0204] A coil 12 is wound around the outer periphery of the core portion 146A between one end 142A and the other end 144A via a coil winding spool 18.

[0205] The notch 148A provided in the other end 144A is a through hole formed in a direction (Z direction) that is orthogonal to both the vibration direction and the extension direction of the magnetic core 14A.

[0206] The counterweight 80A is fixed inside the through hole (notch 148A) so that the center of gravity is located on the axis of the core 146A.

[0207] Therefore, the movable body 10A can perform the same function as the movable body 10 having the counterweight 80 of Embodiment 1.

[0208] <Variation Example 2>

[0209] Figure 10 This is a partially exploded perspective view showing the main structural components of the modified example 2 of the vibration actuator. Figure 11 yes Figure 10 CC-line sectional view.

[0210] Figure 10 Compared to the movable body 10 of the vibration actuator 1, the movable body 10B of the modified example 2 shown has a different shape in the counterweight 80B and the corresponding top end 144B of the magnetic core 14B. In other words, in the movable body 10B, the counterweight 80B is composed of split parts 81B and 82B.

[0211] The segments 81B and 82B form the periphery surrounding the extended core 147B and are respectively made of high-density materials such as tungsten.

[0212] The extension core 147B is disposed in the magnetic core 14B on the extension line of the magnetic core 146B wound by the coil 12, and is formed continuously with the magnetic core 146B.

[0213] Furthermore, the outer periphery of the magnetic core 146B is surrounded by a winding bobbin 18B, which is formed by combining winding bobbin segments 184 and 185 that are divided along the width direction. A coil 12 is wound on the winding bobbin 18B.

[0214] An extended core portion 147B is provided on a portion of one end 144B, which is continuous in the length direction of the magnetic core 14B, the core portion 146B, and the other end 144B, together with the notch portion 148B.

[0215] The extended core 147B, together with the notch 148B and the head 149B (which is a free end), constitutes the other end 144B of the magnetic core 14B. It can be assumed that at the other end 144B, the counterweight 80B is installed inside the notch 148B.

[0216] The segments 81B and 82B are formed in a U-shaped or L-shaped cross-section. If the segments 81B and 82B have the same shape, the manufacturing cost of the counterweight 80B can be reduced.

[0217] The segments 81B and 82B are installed in such a way that they enclose the extension core 147B.

[0218] The segments 81B and 82B are fixed to the extension core 147B by pressing, adhesive, or the like. The segments 81B and 82B are positioned in the concave portion between the part of the magnetic core 14B where the coil 12 is wound and the head 149B, and are configured to surround the extension core 147B. Therefore, even if centrifugal force is generated due to the rotation of the movable body 10B, they are not easily detached.

[0219] The counterweight 80B, composed of the split sections 81B and 82B, is formed such that its length in the width direction, i.e., the vibration direction, gradually decreases toward the free end side, i.e. toward the head 149B side. Consequently, the width length of the other end 144B, composed of the counterweight 80B and the head 149B, also shortens in the width direction toward the free end side.

[0220] Therefore, the movable body 10B can perform the same function as the movable body 10 having the counterweight 80 of Embodiment 1.

[0221] (Implementation Method 2)

[0222] [Overall structure of vibration actuator 1C]

[0223] Figure 12 This is a perspective view showing the external appearance of the vibration actuator according to Embodiment 2 of the present invention. Figure 13 This is a perspective view of the vibration actuator 1C with its outer casing 24C removed. Figure 14It is an exploded diagram showing the state of a vibration actuator where the movable part has been removed from the stationary body.

[0224] In this embodiment, an orthogonal coordinate system (X, Y, Z) is used for description. In the following text, the width, depth, and height of the vibration actuator 1C are the lengths in the X, Y, and Z directions, respectively. For convenience, the vibration actuator 1C of this embodiment is... Figures 12 to 15 The X-direction is arranged laterally, and is described as the vibration direction. Furthermore, in this embodiment, the "axis of the movable body" refers to the Y-direction centered on the movable body; the Y-direction side is also called the "top side," and the -Y-direction side is also called the "base side." In this embodiment, the "axis of the movable body" is the same axis as the coil's central axis. Alternatively, the X-direction and negative X-direction can be used as the two sides, the positive Z-direction as the top side, and the negative Z-direction as the bottom side.

[0225] Figures 12 to 14 The vibration actuator 1C shown includes a movable body 10C, a shaft portion 50C, and a fixed body 20C. The movable body 10C is supported on the fixed body 20C via the shaft portion 50C.

[0226] Figure 15 This is an exploded 3D view of the vibration actuator 1C.

[0227] The movable body 10C has a coil 12C and a magnetic core 14C, and the fixed body 20C has magnets (first magnet 30C and second magnet 40C).

[0228] The movable body 10C is rotatably supported on the fixed body 20C in the X or -X direction by using a shaft portion 50C inserted and passed through at one end as a fulcrum and reciprocating at the other end. In the vibration actuator 1C, the movable body 10C, as part of the main body constituting the movable body 10C, has a main counterweight portion 80C for the notch portion and coil-side counterweight portions 802 and 804 on the coil side. In this embodiment, by providing the coil-side counterweight portions (covering sidewall portions) 802 and 804, which are independent of the main counterweight portion (counterweight portion for the notch portion) 80C, inside the coil 12C in the movable body 10C, inertia is increased. The main counterweight portion 80C and the coil-side counterweight portions 802 and 804 are made of a material with a higher specific gravity than the coil 14C. Alternatively, the counterweight portion may be provided as part of the coil 14C, which is the main body of the movable body 10.

[0229] The fixed body 20C rotatably houses the movable body 10C within a housing, which has a base plate 22C and an outer shell 24C covering the base plate 22C and functioning as a cover. When the coil 12C is not energized, the fixed body 20C rotatably supports the movable body 10C in a neutral position (rotation center position) by means of a magnetic spring generated by the attraction of magnets (first magnet 30C and second magnet 40C), which moves in the X direction and the -X direction.

[0230] In other words, when no power is applied, the movable body 10C is supported in a neutral position that allows both ends to rotate in the +-X directions by means of a magnetic spring consisting of magnets (first magnet 30C and second magnet 40C), magnetic core 14C, and coil 12C. The movable body 10C is movably supported on the fixed body 20C around the shaft portion 50C by being located in a position extending parallel to the length direction of the housing 24 within the housing 24, at a reference position that serves as the neutral position (rotation center position, also known as the "rocking center position").

[0231] Furthermore, the magnet of the magnetic spring can be at least one of the first magnet 30C and the second magnet 40C, or it can be only the second magnet 40C.

[0232] [Structure of shaft 50C]

[0233] Figure 16 This is an exploded perspective view of the movable part of the vibration actuator. The shaft 50C rotates freely within the housing, supporting the movable part 10C on one end 142C.

[0234] The shaft portion 50C is mounted between the base plate 22C and the upper surface portion 241C of the outer casing 24C, which are arranged opposite to each other to clamp the movable body 10. A washer 282C externally mounted on the shaft portion 50C is located between the upper surface portion 241C of the outer casing 24C and the movable body 10C, and a washer 284C externally mounted on the shaft portion 50C is located between the base plate 22C and the movable body 10C.

[0235] Through these washers 282C and 284C, the shaft portion 50C supports the movable body 10C in a manner that allows for smooth reciprocating rotation relative to the fixed body 20. The shaft portion 50C can be constructed from either a non-magnetic or magnetic material. In this embodiment, the shaft portion 50C is constructed, for example, from a magnetic material such as SUS420J2 martensitic stainless steel.

[0236] [Structure of movable body 10C]

[0237] As part of the magnetic core 14C constituting the main body of the movable body, the movable body 10C has a main counterweight 80C and coil-side counterweights 802 and 804. The movable body 10C, for example, increases its inertia by fixing the main counterweight 80C and coil-side counterweights 802 and 804 to the magnetic core 14C, thus preventing magnetic flux saturation, maintaining the magnetic spring constant and torque. The movable body 10C will be described in detail below.

[0238] In addition to the main counterweight 80C, the movable body 10C also has a magnetic core 14C extending from one end (base end side) to the other end (top end side), a bushing (bearing) 16C provided on one end side of the magnetic core 14C as a bearing, and a coil body 120 including a coil 12C.

[0239] The movable body 10C has a specified length. One end 142C of the magnetic core 14C is supported by a shaft portion 50C inserted into the bushing 16C. The top end of the other end 144C of the magnetic core 14C is configured as a free end, which is set to be able to swing freely.

[0240] At the magnetic core 14C, between one end 142C and the other end 144C, a coil body 120 is externally mounted.

[0241] The magnetic core 14C is a magnetic body that extends along the coil axis of the coil 12C and is magnetized by energizing the coil 12C. The magnetic core 14C is rotatably disposed between the base plate 22C and the upper surface portion 241C of the outer casing 24C. Furthermore, within the outer casing 24C, the core 14C is disposed at predetermined intervals between the two side surfaces 242C and 243C, with its other end 144C capable of rocking. Here, the predetermined interval refers to the space constituting the rocking (movable) range of the movable body 10C.

[0242] The magnetic core 14C extends along the winding axis of the coil 12C.

[0243] The magnetic core 14C has a core portion (core portion) 146C extending in such a way as to connect one end 142C and another end 144C with a free end 149C.

[0244] The magnetic core 14C can be a ferrite core. In addition, the magnetic core 14C can also be made of electromagnetic stainless steel, sintered materials, MIM (metal injection molding) materials, laminated steel sheets, electro-galvanized steel sheets (SECC, specific gravity 7.85), etc.

[0245] The magnetic core 14C extends in a direction orthogonal to the axial direction of the shaft portion 50C. A bushing 16C is inserted into a through hole 143 formed at one end of the magnetic core 14C, and the magnetic core 14C rotates via the shaft portion 50C, which is inserted into and passes through the bushing 16C. The other end of the magnetic core 14C is a free end, vibrating in the X direction in a direction orthogonal to the extending direction of the base plate 22C (which serves as the fixed body 20C) and the upper surface portion 241C of the outer casing 24C.

[0246] The magnetic core 14C is arranged from one end 142C to the other end (top end side) in the order of shaft 50C, coil 12C, and the other end 144C that constitutes the free end.

[0247] The core portion 146C extends between one end 142C and another end 144C (specifically, the free end 149C), and is a portion whose shape is smaller than that of the one end 142C and the free end 149C (the other end 144C). In this embodiment, the core portion 146C is formed as a flat plate having a width in the vibration direction and a thickness along the axial direction (Z direction) of the shaft portion 50C.

[0248] The magnetic core 14C is a component that is formed by sequentially connecting the base end (one end 142C) to the top end (the other end 144C) in the order of one end 142C, the core part 146C, and the free end 149C.

[0249] On the base end side of the magnetic core 146C, a coil body 120, with an outer shape approximately the same size as that of one end 142C, is externally mounted to surround its outer periphery. Furthermore, on the other end 144C side of the magnetic core 146C, a main counterweight 80C is provided to surround its outer periphery. Thus, in the movable body 10C, the outer surface of the coil body 120, the outer surface of one end 142C, and the outer surface of the main counterweight 80C (which partially constitutes the outer surface of the other end 144C) are continuously arranged in a planar manner along the length direction. Therefore, the movable body 20C is formed so that weight can be added without changing its overall dimensions.

[0250] Furthermore, the bushing 16C is cylindrical, allowing the movable body 10C to rotate around the inserted and penetrated shaft 50C. It can be made of any material, such as sintered metal or resin. If the shaft 50C is magnetic, the bushing 16C is preferably made of a non-magnetic material. Alternatively, if the shaft 50C is non-magnetic, the bushing 16C can be made of a magnetic material.

[0251] Thus, if either the shaft 50C or the bushing 16C is a non-magnetic body, the magnetic flux passing through the magnetic core 14C will not pass through the shaft 50C between the shaft and the bushing 16C, and the friction between the two will not increase due to the occurrence of magnetic attraction.

[0252] In other words, no friction caused by magnetic attraction is generated between the bushing 16C and the shaft portion 50C inserted into and passing through the bushing 16C, allowing the movable body 10C to rotate smoothly. For example, the shaft portion 50C can use a durable magnetic shaft (e.g., SUS420J2), and a copper-based sintered bearing can be used as the bushing 16C to form the vibration actuator 1C. Thus, unwanted magnetic attraction can be suppressed when driving the movable body 10C, and the movable body 10C can be held with low friction. In other words, wear caused by driving the movable body 10C can be suppressed, achieving a highly reliable vibration actuator 1C.

[0253] In addition, one end 142C of the magnetic core 14C is fixed to one end 152C of the flexible substrate 15C, and the two ends (the coil wire portions at both ends) of the coil 12C are connected to the circuit of the flexible substrate 15C.

[0254] The flexible substrate 15C supplies power to the coil 12C, and in this embodiment, it is configured such that the movable body 10C is connected to the fixed body 20C.

[0255] The flexible substrate 15C has one end 152C connected to the coil 12C of the movable body 10C, another end 154C fixed to the side of the fixed body 20C, and at least one flexible bending portion 156C located between the one end 152C and the other end 154C, which conducts from one end to the coil 12C. The bending portion 156C is sandwiched between the one end 152C and the other end 154C and has flexibility that deforms in response to the vibration of the movable body 10C. The bending portion 156C is flexible in a direction orthogonal to the axial direction of the shaft portion 50C.

[0256] Figure 17 This is an enlarged exploded view of the coil body. Figure 18 This is an enlarged view showing the main structural parts of the coil body. Figure 19 yes Figure 13 A cross-sectional view in the direction of the arrow on the DD line.

[0257] like Figures 15 to 19 As shown, the coil body 120 has a coil winding spool 18C (first winding spool divider 1810, second winding spool divider 1820) externally mounted on the magnetic core 146C, a coil 12C wound on the coil winding spool 18C, and coil-side counterweights 802 and 804 inside the coil 12C. In other words, the coil body 120 has coil-side counterweights 802 and 804 inside the coil 12C.

[0258] Coil 12C is a coil that enables the movable body 10C to move when energized, and magnetizes the magnetic core 14C when energized, specifically magnetizing one end 142C and the other end 144C into magnetic poles. Coil 12C changes the polarity of the two ends (one end 142C and the other end 144C (free end 149C)) of the magnetic core 14C by switching the direction of energization.

[0259] The coil winding spool 18C is composed of a first winding spool divider 1810 and a second winding spool divider 1820. The first winding spool divider 1810 and the second winding spool divider 1820 respectively have main body surface portions 181c and 182c that cover the magnetic core portion 146C from the outside, specifically from opposite directions in the Z direction (thickness direction), and flanges 181a, 182a, 181b, and 182b respectively provided on one end side and the other end side of the main body surface portions 181c and 182c.

[0260] The first winding bobbin segment 1810 and the second winding bobbin segment 1820 are externally mounted and fixed to the magnetic core 146C in a manner where their main body surfaces 181c and 182c sandwich the coil-side counterweights 802 and 804, which are spaced apart in the vibration direction and are disposed on both sides of the magnetic core 146C, in a direction opposite to each other in the Z direction (thickness direction). The coil-side counterweights 802 and 804 are disposed together with the main body surfaces 181c and 182c of the first winding bobbin segment 1810 and the second winding bobbin segment 1820 within the coil 12C.

[0261] Furthermore, the first winding bobbin segment 1810 and the second winding bobbin segment 1820 are insulators and can be made of resin materials such as polyamide resin, liquid crystal polymer, or polyphenylene sulfide resin (PPS resin). Additionally, a winding portion 188C is provided on the flange 181a, 182a at one end 142C of each of the first winding bobbin segment 1810 and the second winding bobbin segment 1820. This winding portion 188C is wound as the coil wire at the end of the coil when the coil 12C is wound.

[0262] The coil-side counterweights 802 and 804 are components that enhance the weight of the movable body 10 and are made of a high-density material. The coil-side counterweights 802 and 804 within the coil are made of a material with a specific gravity higher than that of the coil 14C. For example, the coil-side counterweights 802 and 804 are preferably formed of a material with a specific gravity more than twice that of materials such as electroplated galvanized steel sheet (SECC, specific gravity 7.85) (e.g., a specific gravity of approximately 16 to 19), for example, tungsten can be used.

[0263] The coil-side counterweights 802 and 804 can be configured in any structure as long as they are disposed within the coil 12C. In this embodiment, in order to be located within the coil 12C in the coil body 120, a structure is adopted that serves as two side wall portions of the coil winding cylinder 18C surrounding the magnetic core 146C, but it is not limited to this and can be thicker or longer. In addition, it can also be provided on the upper and lower walls of the coil winding cylinder 18C.

[0264] In the magnetic core 14C, the other end 144C, which protrudes from the part where the coil body 120 is mounted toward the free end 149C, has a part on the other end 144C side of the magnetic core part 146C, a main counterweight part 80C surrounding this part, and the free end 149C.

[0265] Similar to the coil-side counterweights 802 and 804, the main counterweight 80C is a component that increases the weight of the movable body 10 and is made of a high-density material (e.g., a specific gravity of about 16 to 19). For example, tungsten can be used for the main counterweight 80C. Therefore, even if the external dimensions of the movable body 10C are set during the design process, the mass of the movable body 10C can be increased relatively easily, achieving the desired vibration output without saturating the magnetic flux or affecting the magnetic spring constant and torque.

[0266] The main counterweight 80C is composed of two segments 81C and 82C, which are formed, for example, in a U-shape. Here, it is installed such that it clamps the other end 144C side of the magnetic core 146C in the extending direction of the shaft 50C, thereby covering the outer periphery.

[0267] Furthermore, the segmented bodies 81C and 82C are respectively formed such that both sides narrow towards the free end 149C. When the segmented bodies 81C and 82C are installed at the other end 144C side of the magnetic core 146C, the top of the movable body 10C narrows towards the free end 149C.

[0268] The two segments 81C and 82C are made of high-density materials such as tungsten.

[0269] On the other end 144C side of the columnar magnetic core 14C, which constitutes the main body of the movable body 10C, a portion is cut off, and this portion is embedded in the partitions 81C and 82C respectively. That is, the partitions 81C and 82C are mounted on a part of the magnetic core 14C and are integrally disposed with the magnetic core 14C on the other end side of the magnetic core 14C.

[0270] Furthermore, as long as the core 146C is mounted between one end 142C and the free end 149C in a manner that surrounds the core 146C, the cross-sections of the segments 81C and 82C can be formed in an L-shape instead of a U-shape. In addition, if the segments 81C and 82C are formed in the same shape, the manufacturing cost of the main counterweight 80C can be reduced.

[0271] The segments 81C and 82C are fixed to the core portion 146C by pressing or by adhesive. On the core portion 146C of the magnetic core 14C, the segments 81C and 82C are disposed in a concave portion between the coil body 120 and the free end 149C. Therefore, even if centrifugal force is generated due to the rotation of the movable body 10C, they are not easily detached.

[0272] Furthermore, since the main counterweight 80C, composed of the split bodies 81C and 82C, is formed such that its length gradually decreases in the width direction (i.e., the vibration direction) towards the free end 149, the width length of the other end (top part) 144C, composed of the main counterweight 80C and the free end 149C, also decreases in the width direction towards the free end. Moreover, in the movable body 10C, the center of the magnetic pole of the movable body 10C is located on the coil shaft of the coil 12C and at the center of the magnetic core 146C.

[0273] [Structure of Fixation Body 20C]

[0274] The fixed body 20C supports the movable body 10C rotatably via the shaft 50C.

[0275] In addition to the magnets (first magnet 30C and second magnet 40C), the fixture 20C also has a base plate 22C and a shell 24C.

[0276] The base plate 22C is formed of a plate-shaped material such as steel plate (a rectangular plate in this embodiment). In this embodiment, the base plate 22C constitutes one side surface (the bottom surface) of the vibration actuator 1C.

[0277] A housing 24C is mounted on a base plate 22C in a covering manner. The base plate 22C and the housing 24C together constitute a cover, which movably accommodates the movable body 10C. In this embodiment, the cover is formed into a hollow cuboid shape.

[0278] A shaft portion 50C is fixed at one end of the housing along a direction orthogonal to the vibration direction of the movable body 10C. The upper surface portion 241C of the outer casing 24C forms another side surface opposite to one side surface of the vibration actuator 1C.

[0279] A shaft portion 50C is erected on one end of the base plate 22C via a shaft fixing portion 23C. A movable body 10C is arranged opposite to it at a distance above the base plate 22C. Furthermore, at one end of the base plate 22C, a first magnet 30C is arranged opposite to one end surface of one end 142C of the movable body 10C when it is not energized, in the extending direction of the movable body 10C. Furthermore, at the other end of the base plate 22C, a second magnet 40C is arranged opposite to the end surface (top surface of the free end 149C) of the other end 144C of the movable body 10C when it is not energized, in the extending direction of the movable body 10C. Although this embodiment employs a structure with a first magnet 30C, the first magnet 30C can be omitted, and a structure with only a second magnet 40C can be used.

[0280] The outer casing 24C is fixed to the base plate 22C in such a way that it covers the movable body 10C opposite to the base plate 22C. The upper surface portion 241C of the outer casing 24C, which is opposite to the base plate 22C in height (Z direction), has the other end of the shaft portion 50C fixed to it via a shaft fixing portion (not shown).

[0281] The outer casing 24C is formed as a box shape (in this embodiment, it is a square box shape) with an opening on the side of the base plate 22C. In the outer casing 24C, the upper surface portion 241C has a shaft portion 50C mounted between it and the base plate 22C. The outer casing 24C has two side surface portions 242C and 243C that are spaced apart from each other in the vibration direction of the movable body 10C, for example, in the width direction (X direction), and one end surface portion 244C and the other end surface portion 245C that are spaced apart in the extension direction of the movable body 10C (here, the depth direction (Y direction)).

[0282] There are no particular restrictions on the size of the cover formed by mounting the outer shell 24C onto the base plate 22C, but in this embodiment, it is configured as a cuboid shape with the longest depth among the width (X direction), depth (Y direction), and height (Z direction).

[0283] Alternatively, the outer shell 24C and the base plate 22C can be formed together from a conductive material such as a plate-shaped material (a rectangular plate in this embodiment) like steel. Thus, the base plate 22C and the outer shell 24C can function as an electromagnetic barrier.

[0284] Alternatively, on the two side surfaces 242C and 243C of the outer casing 24C, a buffer portion 60C is provided at the other end of each of them, which contacts the free end of the vibrating movable body 10C.

[0285] Magnets (first magnet 30C and second magnet 40C) enable the movable body 10C to move through cooperation with coil 12C. The magnets function as magnetic springs by attracting the movable body 10C. In this embodiment, the magnets, together with the magnetic core 14C to which coil 12C is wound, form a magnetic spring that freely supports the movable body 10C.

[0286] The magnet is arranged such that its magnetic poles are opposite to those of coil 12C in the axial direction of coil 12C.

[0287] In this embodiment, the magnet has a first magnet 30C and a second magnet 40C. The first magnet 30C is opposite to one end 142C of the magnetic core 14C at a distance spaced apart in the axial direction of the coil 12C, and the second magnet 40C is opposite to the other end 144C (free end 149C) of the magnetic core 14C at a distance spaced apart in the axial direction of the coil 12C.

[0288] The first magnet 30C and the second magnet 40C are magnetized toward the magnetic core 14C (movable body 10C). In this embodiment, the magnetization directions of the first magnet 30C and the second magnet 40C are parallel to the axial direction of the coil 12C. The first magnet 30C and the second magnet 40C have two different magnetic poles arranged side by side in a direction orthogonal to the extending direction of the shaft 50C (corresponding to the vibration direction of the movable body 10C), and these two magnetic poles are surfaces opposite to the magnetic core 14C.

[0289] The magnet is positioned such that the center of the magnetic core 14C of the movable body 10C (which is the axis of the coil 12C, equivalent to the center of the magnetic pole when the coil 12C is energized) is located opposite to the boundary of the magnetic pole, i.e., the switching position of the magnetic pole.

[0290] The polarities of the first magnet 30C and the second magnet 40C are magnetized such that the torque generated by energizing the coil 12C of the movable body 10C is produced in the same rotational direction of the movable body 10C.

[0291] In the first magnet 30C and the second magnet 40C, the magnetic poles 301C and 401C disposed on the side surface portion 242C and opposite to the movable body 10C are formed to be the same magnetic poles. Figure 20 (The middle one is the S pole). Furthermore, in the first magnet 30C and the second magnet 40C, the magnetic poles 302C and 402C disposed on the side surface portion 243C and opposite to the movable body 10C are formed to be the same magnetic pole ( Figure 20 (The middle is the N pole).

[0292] The back of the first magnet 30C is attached with a back magnetic yoke 32C, and the back of the second magnet 40C is attached with a back magnetic yoke 42C, in order to increase the magnetic attraction of each magnet 30C and 40C.

[0293] For example, suppose that in the first magnet 30C and the second magnet 40C, the side surface portion 242C is magnetized as the S pole and the side surface portion 243C is magnetized as the N pole. In this case, when the coil 12C is not energized, as... Figure 20 As shown, the first magnet 30C and the second magnet 40C respectively generate magnetic flux emanating from the N pole and incident on the S pole. When not energized, one end 142C of the magnetic core 14C, to which the coil 12C is wound, is attracted by both the S and N poles of the first magnet 30C, and is held at the switching position between different magnetic poles 301C and 302C (S pole and N pole). Furthermore, the other end 144C of the magnetic core 14C is attracted by both the S and N poles of the second magnet 40C, and is held at the switching position between different magnetic poles 401C and 402C (S pole and N pole). The first magnet 30C and the second magnet 40C, together with the magnetic core 14C which is a movable body 10C, function as magnetic springs through the magnetic attraction generated between them, freely supporting the movable body 10C.

[0294] The other end 154C of the flexible substrate 15C, which is connected to the coil 12C at one end 152C, is fixed to the side surface portion 242C.

[0295] The flexible substrate 15C is disposed adjacent to the shaft portion 50C between the shaft portion 50C and the side surface portion 242C which is orthogonal to the axial direction of the shaft portion 50C. One end 152C of the flexible substrate 15C connected to the coil 12C is fixed to one end of the movable body 10C, and the other end 154C is fixed to the side surface portion 242C in a state exposed to the fixed body 20C and the outer surface of the cover.

[0296] When the movable body 10C is movable, the range of motion near the shaft portion 50C is smaller than the range of motion at the other end of the movable body 10C. Therefore, the load applied to the bent portion 156C from the flexible substrate 15C located near the shaft portion 50C is smaller. Thus, since the flexible substrate 15C is fixed near the shaft portion 50C, displacement of the flexible substrate 15C is minimized, and breakage due to stress generated during movement can be prevented.

[0297] Furthermore, in the flexible substrate 15C, for example, an elastic member such as an elastic adhesive or elastic adhesive tape can be placed between one end 152C and the movable body 10C, so that the elastic member can absorb the impact during vibration.

[0298] [Magnetic circuit of vibration actuator 1C]

[0299] Figure 20 This is a diagram showing the magnetic circuit of the vibration actuator, indicating the state of the vibration actuator 1C as viewed from the positive side (top) of the Z direction to the negative side (bottom) of the Z direction. Figures 21A to 21C This is a plan view showing the movement of the movable body 10C, showing the state of the vibration actuator 1C as viewed from the positive side (top) in the Z direction to the negative side (bottom) in the Z direction. Figure 21A This indicates the state (reference state) of the movable body 10C when it is not powered on. Figure 21B This indicates the state of the movable body 10C when viewed from the top end of the movable body 10C, that is, from the other end 144C of the magnetic core 14C, when the coil 12C is energized in a clockwise direction. Figure 21C This indicates the state of the movable body 10C when viewed from the top end of the movable body 10C, i.e. from the other end 144C of the magnetic core 14C, when the coil 12C is energized in a counterclockwise direction.

[0300] In the vibration actuator 1C, the movable body 10C is positioned between the base plate 22C and the outer casing 24C of the fixed body 20C, with one end supported by the shaft portion 50C. Furthermore, magnets (first magnet 30C and second magnet 40C) are positioned opposite the two ends (one end 142C and the other end 144C) of the magnetic core 14C on which the coil 12C is wound, with their two different magnetic poles facing the coil 12C side. The magnetic poles 301C of the first magnet 30C and 401C of the second magnet 40C are the same, and the magnetic poles 302C of the first magnet 30C and 402C of the second magnet 40C are the same.

[0301] In each of the first magnet 30C and the second magnet 40C, two different magnetic poles 301C and 302C, and 401C and 402C are arranged side by side in the vibration direction (X direction) orthogonal to the axial direction of the shaft 50C.

[0302] The movable body 10C is powered by a power supply unit (e.g., via a flexible substrate 15C). Figures 22 to 24 The drive control unit 203 shown energizes the coil 12C, which reciprocates in the X direction, i.e., in the direction of contact and separation from the side surfaces 242C and 243C of the housing 24.

[0303] Specifically, the other end of the movable body 10C (specifically, the other end 144C of the magnetic core 14C) vibrates. As a result, the vibration output of the vibration actuator 1C is transmitted to the user of the electronic device having the vibration actuator 1C.

[0304] In the vibration actuator 1C, a Figure 20 The magnetic circuit shown.

[0305] In the vibration actuator 1C, when the coil 12C is not energized, i.e. in the reference state, the two ends (one end 142C and the other end 144C) of the magnetic core 14C wound with the coil 12C are attracted by the first magnet 30C and the second magnet 40C, respectively.

[0306] The center of the length (length of the vibration direction) orthogonal to the axial direction of the magnetic core 14C and its two ends (one end 142C and the other end 144C) is located opposite to the switching position of the magnetic poles of the magnet. Furthermore, the center of the length (length of the vibration direction) orthogonal to the axial direction of the two ends (one end 142C and the other end 144C) is located on the same axis as the axis of the coil 12.

[0307] Specifically, one end 142C of the magnetic core 14C is attracted by the magnetic attraction between the different magnetic poles 301C and 302C of the first magnet 30C and remains at the switching position of the magnetic poles 301C and 302C.

[0308] In addition, the other end of the magnetic core 14C (or the free end 149C) 144C is attracted by the magnetic attraction between the different magnetic poles 401C and 402C of the second magnet 40C, and remains at the switching position of the magnetic poles 401C and 402C.

[0309] In this way, when no power is applied, the movable body 10C is held in the reference state only by the magnetic spring formed by the first magnet 30C and the second magnet 40C of the fixed body 20C.

[0310] In the vibration actuator 1C, the coil 12C is configured such that it is along the magnetic flux from the first magnet 30C and the second magnet 40C and is spaced apart from the first magnet 30C and the second magnet 40C.

[0311] Through this structure, such as Figure 20 and 21B As shown, when energized, the current flowing in coil 12C magnetizes both ends (one end 142C and the other end 144C) of magnetic core 14C, forming different magnetic poles. Specifically, one end 142C is magnetized as the N pole, and the other end 144C is magnetized as the S pole.

[0312] Thus, one end 142C is attracted by the magnetic pole 301C of the first magnet 30C and repelled by the magnetic pole 302C of the first magnet 30C, generating a thrust f, and moves in the direction of the thrust f. On the other hand, the other end 144C repels the magnetic pole 401C of the second magnet 40C and is attracted by the magnetic pole 402C of the second magnet 40C, moving in the direction of the thrust f.

[0313] like Figure 21BAs shown, by energizing coil 12C, the two ends (one end 142C and the other end 144C) located at the position clamping shaft 50C in the vibration actuator 1C move in the directions of thrust f and -F, respectively, thereby generating a thrust -M in the same direction of rotation. As a result, movable body 10C rotates about shaft 50C in the direction of thrust -M, and the other end 144C of movable body 10C moves towards side surface 243C and comes into contact (specifically, collides) with side surface 243C, i.e., the cover, applying vibration to the cover.

[0314] Furthermore, when the energizing direction of coil 12C is switched to the opposite direction, such as... Figure 21C When energized, opposing forces -f and F are generated. Specifically, one end 142C is magnetized as the S pole, and the other end 144C is magnetized as the N pole. Thus, end 142C repels the magnetic pole 301C of the first magnet 30C and is attracted by the magnetic pole 302C of the first magnet 30C, generating a force -f and moving in the direction of force -f. On the other hand, the other end 144C is attracted by the magnetic pole 401C of the second magnet 40C and repels the magnetic pole 402C of the second magnet 40C, moving in the direction of F.

[0315] like Figure 21C As shown, by energizing coil 12C, the two ends (one end 142C and the other end 144C) located at the position clamping shaft 50C in the vibration actuator 1C move in the directions of thrust f and -F, respectively, thereby generating a thrust -M in the same direction of rotation. As a result, movable body 10C rotates about shaft 50C in the direction of thrust M, and the other end 144C of movable body 10C moves toward the side surface 242C opposite to the side surface 243, and comes into contact (specifically, collides) with the side surface 242C, i.e., the cover, applying vibration to the cover.

[0316] In the vibration actuator 1C, instead of using elastic components such as leaf springs (metal springs), a magnetic spring employing magnets (at least a second magnet 40C) and a magnetic core 14C is used to freely support the movable body 10C by reciprocating vibration relative to the fixed body 20C around the shaft 50C. Therefore, unlike conventional vibration actuators that freely support the movable body by vibration using metal springs, damage caused by metal fatigue or impact, inherent defects of metal springs, is prevented.

[0317] [Effect of Vibration Actuator 1C]

[0318] In the vibration actuator 1C, the movable body 10C has a magnetic core 14C with one end 142C and the other end 144C protruding from both ends of the wound coil 12C, respectively. The fixed body 20C has magnets (a first magnet 30C and a second magnet 40C). Furthermore, the shaft portion 50C supports the movable body 10C rotatably relative to the fixed body 20 at one end 142C of the magnetic core 14C. The second magnet 40C has two magnetic poles 401C and 402C with different polarities that are spaced apart from the other end 144C when not energized and are arranged side by side in the reciprocating rotational vibration direction. Coil-side counterweights 802 and 804 are disposed inside the coil 12C.

[0319] Therefore, for example, even if the external dimensions of the movable body 10C are set during the design process, the mass of the movable body 10C can be increased relatively easily, and the desired appropriate vibration output can be achieved without saturating the magnetic flux or affecting the magnetic spring constant and torque.

[0320] Furthermore, in this embodiment, in the coil winding spool 18C surrounding the four sides of the magnetic core 146C, two side portions spaced apart in the vibration direction are formed by the coil-side counterweights 802 and 804 within the coil. This further increases the weight of the other end 144C, which serves as the rocking portion, compared to one end 142C, without changing the overall dimensions of the movable body 10C itself.

[0321] Furthermore, the coil winding cylinder 18C can be divided into a first winding cylinder segment 1810, a second winding cylinder segment 1820, and coil-side counterweights 802 and 804. Therefore, by simply mounting these first winding cylinder segments 1810 and 1820, and coil-side counterweights 802 and 804 onto the magnetic core 146C from the outside, the coil winding cylinder 18C can be easily positioned onto the magnetic core 146C. Moreover, by simply mounting the coil winding cylinder 18C onto the magnetic core 14C, the mass of the movable body 10C can be increased without changing its external dimensions.

[0322] In this way, the coil-side counterweights 802 and 804 can increase the mass of the top part (other end) of the movable body 10C without changing the size of the movable body 10C or detaching the coil-side counterweights 802 and 804 from the movable body 10C. As a result, in the vibration actuator 1C, inertia can be increased without lowering the resonance point while maintaining the magnetic properties.

[0323] Furthermore, a main counterweight 80C made of a high-density material is installed in the notch 148C, where a portion of the other end 144C of the magnetic core 14C has been cut off. The main counterweight 80C is positioned in the notch 148C such that its movement in the vibration direction within the notch 148C is restricted. Thus, the main counterweight 80C is surrounded on all four sides in the direction of movement during the reciprocating rotational vibration of the movable body 10C, and is thus provided within the movable body 10C as part of the magnetic core 14C, which forms the main body of the movable body along its entire length.

[0324] In other words, together with the coil-side counterweights 802 and 804, the mass of the top part (other end) of the movable body 10C can be increased without changing the size of the movable body 10C and without the main counterweight 80C detaching from the movable body 10C. Thus, a vibration actuator 1C that increases inertia without lowering the resonance point while maintaining magnetic properties can be realized.

[0325] Furthermore, in this embodiment, magnets, namely the first magnet 30C and the second magnet 40C, are arranged on both sides of the magnetic core 14C. The two magnetic poles 301C and 302C, and 401C and 402C of each magnet are arranged such that the torque generated at each end 142C, 144C of the movable body 10 is generated in the same rotational direction. Magnetic attraction is generated between the two ends (one end 142C and the other end 144C) of the magnetic core 14C and the first magnet 30C and the second magnet 40C, causing them to attract each other.

[0326] Therefore, when the movable body 10C is movable through the cooperation of the first magnet 30C and the second magnet 40C with the coil 12C, the load generated by the magnetic attraction force applied to the shaft 50C is canceled out, and the load applied to the shaft 50C and the bushing 16C can be reduced.

[0327] Furthermore, since the movable body 10C is in contact with the side surfaces 242C and 243C of the cover (in a state equivalent to contact), it can directly transmit vibration to the vibration actuator cover, causing the vibration actuator 1C itself to generate a large vibration. In addition, since the movable body 10C is in contact with the fixed body 20C (cover) during vibration, the vibration amount also becomes constant, and the vibration actuator 1C can achieve stable vibration output.

[0328] Furthermore, the other end 144C of the magnetic core 14C, which is the free end of the movable body 10C, is formed such that its thickness decreases in the X direction towards the free end. Therefore, when the other end 144C swings and comes into contact with the cushioning materials 61C and 62C, the movable body 10C has a larger range of motion compared to the case where the other end 144C of the magnetic core 14C, which is the free end of the movable body 10C, has the same thickness in the X direction towards the free end. Thus, the vibration actuator 1C can ensure a larger vibration output.

[0329] Furthermore, according to the vibration actuator 1C, the inner wall surface (side surface portions 242C, 243C) of the outer casing 24C can be configured such that a buffer portion 60C, consisting of buffer materials (61C, 62C), contacts the movable body 10C. The buffer portion 60C can mitigate the impact when the movable body 10C vibrates and contacts the base plate 22C or the outer casing 24C, reducing the generation of contact sound and vibration noise, while transmitting the vibration to the user. Moreover, during each vibration, since the movable body 10C alternately contacts (specifically collides with) the base plate 22C and the outer casing 24C via the buffer portion 60C, the vibration output is amplified. Therefore, the user can experience a vibration output greater than the actual vibration output generated by the movable body 10C.

[0330] Here, the vibration actuator 1C is powered from the power supply unit (e.g., via the flexible substrate 15C) through the flexible substrate 15C. Figures 22 to 24 The drive control unit 203 shown inputs an AC wave to the coil 12C. That is, the energizing direction of the coil 12C is switched periodically, and the thrust M on the positive side of the X direction and the thrust -M on the negative side of the X direction act alternately on the movable body 10C. As a result, the other end of the movable body 10C vibrates in an arc shape in the XY plane.

[0331] The driving principle of the vibration actuator 1C will be briefly explained below. In the vibration actuator 1C of this embodiment, the moment of inertia (inertia) of the movable body 10C is set as J[kg]. m 2 Let the spring constant for the torsional direction of the magnetic spring be K. sp In the case of movable body 10C relative to fixed body 20C, the resonant frequency f is calculated according to the following formula (1). r [Hz] vibration.

[0332] [Formula 4] …(1) Resonant frequency [Hz] J: Moment of inertia [Kgm] 2 ] K sp Spring constant [Nm / rad] Since the movable body 10C constitutes the mass part in the vibration model of the spring-mass system, the resonant frequency f of the movable body 10C is equal to the resonant frequency f of the movable body 10C. r When an AC wave is input to coil 12C, the movable body 10C enters a resonant state. In other words, by means of an AC wave from the power supply unit (e.g., ... Figures 22 to 24 The drive control unit 203 shown inputs a frequency to coil 12C that is approximately equal to the resonant frequency f of movable body 10C. r The alternating waves can efficiently cause a movable body to vibrate at 10°C.

[0333] The motion equations and circuit equations representing the driving principle of the vibration actuator 1C are shown below. The vibration actuator 1C is driven based on the motion equation shown in equation (2) and the circuit equation shown in equation (3).

[0334] [Formula 5] …(2) J: Moment of inertia [Kgm] 2 ] θ(t): Angle [rad] K t Torque constant [Nm / A] i(t): Current [A] K sp Spring constant [Nm / rad] D: Damping coefficient [Nm / (rad / s)] [Formula 6] …(3) e(t): Voltage [V] R: Resistance [Ω] L: Inductance [H] K e Back electromotive force constant [V / (rad / s)] In other words, within the range satisfying formula (2), the moment of inertia (inertia) J [kg·m] of the movable body 10C in the vibration actuator 1C can be appropriately changed. 2 Rotation angle θ(t) [rad], torque constant K t [N·m / A], current i(t) [A], spring constant K sp [N·m / rad], damping coefficient D [N·m / (rad / s)], etc. Furthermore, within the range satisfying equation (3), the voltage e(t) [V], resistance R [Ω], inductance L [H], and back electromotive force constant K can be appropriately changed. e [V / (rad / s)].

[0335] Thus, in the vibration actuator 1C, when the moment of inertia (inertia) J corresponding to the movable body 10C and the spring constant K of the magnetic spring is applied... sp The determined resonant frequency f r When the AC wave is energized to the coil 12C, it can effectively obtain a large vibration output.

[0336] <Electronic devices with vibration actuators installed>

[0337] Figures 22 to 24 This is a diagram showing an example of an electronic device with a vibration actuator installed. Figure 22 This indicates an instance where a vibration actuator is installed in the game controller (GC). Figure 23 This refers to an example of installing a vibration actuator in a smartphone SP, which is a mobile terminal. Figure 24 This indicates an example of a vibration actuator being installed in a wearable terminal W.

[0338] The game controller GC is connected to the game console via wireless communication, and is used by the user by gripping or holding it. Here, the game controller GC has a rectangular shape, and the user grips and operates the left and right sides of the game controller GC with both hands.

[0339] The game controller GC transmits commands from the game console to the user via vibration. Furthermore, although not shown in the diagram, the game controller GC also has functions beyond command transmission, such as an input control unit for the game console.

[0340] A smartphone SP is a mobile communication terminal such as a mobile phone or smartphone. A smartphone SP uses vibration to notify the user of incoming messages from external communication devices and performs various functions (e.g., providing a sense of operation and presence).

[0341] The wearable terminal W is a terminal worn by a user. Here, the wearable terminal W is ring-shaped and worn on the user's finger. The wearable terminal W connects to an information communication terminal (such as a mobile phone) via wireless communication. The wearable terminal W notifies the user of incoming calls and messages on the information communication terminal via vibration. Furthermore, the wearable terminal W may have functions other than message notification (e.g., input operations on the information communication terminal).

[0342] like Figures 22 to 24 As shown, electronic devices such as the game controller GC, smartphone SP, and wearable terminal W each have a communication unit 201, a processing unit 202, a drive control unit 203, and vibration actuators 100A, 100B, 100C, and 100D as drive units. Furthermore, Figures 22 to 24The vibration actuators 100A, 100B, 100C, and 100D shown are applicable. Figures 1 to 21C The vibration actuator 1 shown (which also includes vibration actuators with movable bodies 10A and 10B) and vibration actuator 1C are shown. In addition, multiple vibration actuators 100A and 100B are installed in the game controller GC.

[0343] For example, in a game controller GC, a smartphone SP, and a wearable terminal W, vibration actuators 100A, 100B, 100C, and 100D are mounted parallel to the main surface of the terminal and the side surfaces 242 and 243 of the housing 24, which are orthogonal to the vibration direction of the vibration actuator 1. The main surface of the electronic device refers to the surface that contacts the user's body surface; in this embodiment, it refers to the vibration transmission surface that contacts the user's body surface and transmits vibrations.

[0344] Specifically, in the game controller GC, vibration actuators 100A and 100B are installed such that the surface in contact with the user's fingertips, fingertips, palm, etc., or the surface with the operating part, is orthogonal to the vibration direction. Furthermore, in the case of a smartphone SP, vibration actuator 100C is installed such that the display screen (touch panel surface) is orthogonal to the vibration direction. In the case of a wearable terminal W, the inner circumferential surface 208 of the annular cover is the main surface (vibration transmission surface), and vibration actuator 1 is installed such that the inner circumferential surface 208 is approximately parallel (including parallel) to the XY plane. Thus, vibrations of the game controller GC, smartphone SP, and wearable terminal W in the direction perpendicular to the main surface are transmitted to the user.

[0345] The communication unit 201 connects to an external communication device via wireless communication, receives signals from the communication device, and outputs them to the processing unit 202. In the case of a game controller GC, the external communication device is the game console itself, which serves as an information communication terminal, and communicates according to short-range wireless communication standards such as Bluetooth (registered trademark). In the case of a smartphone SP, the external communication device is, for example, a base station, and communicates according to mobile communication standards. Furthermore, in the case of a wearable terminal W, the external communication device is, for example, an information communication terminal such as a mobile phone, smartphone, or portable game console, and communicates according to short-range wireless communication standards such as Bluetooth (registered trademark).

[0346] The processing unit 202 converts the input signal into a drive signal for driving the vibration actuators 100A, 100B, 100C, and 100D via a conversion circuit unit (not shown), and outputs it to the drive control unit 203. Furthermore, in the smartphone SP, the processing unit 202 generates drive signals based not only on the signal input from the communication unit 201, but also on signals input from various functional units (not shown, such as operation units like the touch panel).

[0347] The drive control unit 203 is connected to the vibration actuators 100A, 100B, 100C, and 100D, and is equipped with circuitry for driving the vibration actuators 100A, 100B, 100C, and 100D. The drive control unit 203 supplies drive signals to the vibration actuators 100A, 100B, 100C, and 100D.

[0348] Vibration actuators 100A, 100B, 100C, and 100D are driven according to drive signals from drive control unit 203. Specifically, in vibration actuators 100A, 100B, 100C, and 100D, movable bodies 10, 10A to 10C vibrate in a direction orthogonal to the main surface of the game controller GC, the smartphone SP, and the wearable terminal W.

[0349] Since the movable bodies 10, 10A to 10C come into contact with the side surfaces 242, 243, 242C, and 243C of the outer shells 24 and 24C via the cushioning materials 61, 62, 61C, and 62C each time they vibrate, the impact on the side surfaces 242, 243, 242C, and 243C of the outer shells 24 and 24C, i.e., the impact on the housing, is directly transmitted to the user as vibration along with the vibration of the movable bodies 10, 10A to 10C. In particular, since the game controller GC is equipped with multiple vibration actuators 100A and 100B, one of the multiple vibration actuators 100A and 100B can be driven according to the input drive signal, or both can be driven simultaneously.

[0350] Because vibrations perpendicular to the body surface are transmitted to the user's body surface in contact with the game controller GC, smartphone SP, and wearable terminal W, sufficient haptic vibrations can be provided to the user. In the game controller GC, haptic vibrations can be applied to the user using one or both of vibration actuators 100A and 100B, and highly expressive vibrations, such as selectively applying vibrations of varying strengths, can be applied.

[0351] Thus, vibration actuators 1 and 1C are installed as vibration sources in electronic devices such as gaming devices (game controllers GC), smartphones SP, and wearable terminals W (see reference). Figures 22 to 24In the context of electronic devices, vibration actuators 1 and 1C, installed in the electronic device, achieve the vibration function of the electronic device through the reciprocating rotational vibration of movable bodies 10, 10A to 10C. For example, vibration actuators 1 and 1C provide the user with a sense of operation, presence, or notification through vibration.

[0352] The invention described above is based on specific embodiments and is not limited to the above embodiments. Changes can be made without departing from its spirit.

[0353] Furthermore, for example, the vibration actuator of the present invention is suitable for use in mobile devices other than the game controller GC, smartphone SP, and wearable terminal W shown in the embodiments (e.g., mobile information terminals such as tablet computers, portable game terminals). In addition, the vibration actuators 1 and 1C of this embodiment can also be used in electric beauty devices such as beauty massagers that require vibration, in addition to the aforementioned mobile devices.

[0354] It should be understood that the embodiments disclosed herein are merely illustrative and not limiting in all respects. It should be recognized that the scope of the invention is defined by the claims rather than the foregoing description, including all modifications within the meaning and scope equivalent to the claims.

[0355] Industrial applicability

[0356] The vibration actuator of the present invention can improve the inertia during driving without increasing the size or affecting the magnetic properties. It can provide users with sufficient tactile vibration while maintaining a small size, and is very useful as a device for electronic devices such as game controllers, smartphones or wearable terminals.

Claims

1. A vibration actuator, comprising: A movable body having a coil and a magnetic core wound around the coil, the magnetic core extending in the direction of the winding axis of the coil, and one end and the other end of the magnetic core protruding from both ends of the coil, respectively; A fixed body having a magnet; and A shaft portion, located at one end of the magnetic core, rotatably supports the movable body relative to the fixed body. Through the cooperation of the magnet and the energized coil, the movable body reciprocates and vibrates relative to the fixed body about the shaft. This vibration actuator is characterized in that... When not energized, the magnet is positioned opposite at least one end of the magnetic core, along the extension direction of the magnetic core, and the magnet has two parallel magnetic poles of different polarities in the reciprocating rotational vibration direction. The magnetic core has a notch at the other end. A counterweight is fixed in the notch. The notch is formed in such a way that it surrounds the core portion extending in the extending direction of the magnetic core at the other end of the magnetic core. The counterweight is composed of multiple segments arranged around the core in the notch.

2. The vibration actuator as claimed in claim 1, wherein, The notch is provided in such a way that, at the other end of the magnetic core, on a cross-section orthogonal to the extending direction of the magnetic core, the cross-section of the core has a certain proportion of area relative to the cross-section of the other end.

3. The vibration actuator as described in claim 1 or 2, wherein, The notch is provided at the other end such that the other end has a thickness in the extending direction of the magnetic core on the free end side of the other end.

4. A vibration actuator, comprising: A movable body having a coil and a magnetic core, one end of which protrudes from the two ends of the coil on which it is wound; A fixed body having a magnet; and A shaft portion, located at one end of the magnetic core, rotatably supports the movable body relative to the fixed body. Through the cooperation of the magnet and the energized coil, the movable body reciprocates in rotational vibration. This vibration actuator is characterized by... When not energized, the magnet is positioned at least a distance apart from the other end, and the magnet has two parallel magnetic poles of different polarities in the direction of the reciprocating rotational vibration. The coil is equipped with a counterweight. The coil is wound on a bobbin mounted on the circumference of the magnetic core. The counterweight is part of the winding drum. The winding spool has a first winding spool divider and a second winding spool divider, both made of an insulator and mounted on the magnetic core from the outside, sandwiching the magnetic core from the outside. The counterweight is a covering sidewall portion disposed between the first winding drum segment and the second winding drum segment to cover the side surface of the magnetic core.

5. The vibration actuator as claimed in claim 4, wherein, The counterweight is disposed between the magnetic core and the coil.

6. The vibration actuator as claimed in claim 4, wherein, The magnetic core has a core portion that extends between the one end and the other end in a manner connecting the two ends, and the cross-section of the core portion orthogonal to the extension direction is smaller than the cross-sections of the one end and the other end that are orthogonal to the extension direction. The winding bobbin is installed in a manner that surrounds the core. The outer surface of the coil is arranged in a manner that is continuous in the length direction from the outer surface of one end to the outer surface of the other end.

7. The vibration actuator as claimed in claim 4, wherein, The other end has a notch; The notch portion is provided with a counterweight for the notch portion, and the specific gravity of the counterweight for the notch portion is greater than that of the magnetic core.

8. An electronic device, characterized in that, It has a built-in vibration actuator as described in claim 1.

9. An electronic device, characterized in that, It has a built-in vibration actuator as described in claim 4.

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