Vibration generating device, vibration reducing device, and electronic equipment

Abstract

To provide a highly reliable vibration generator, and to provide a vibration reduction device and an electronic device.SOLUTION: A vibration generator 3A includes: a pendulum 5A provided at a base 4A so as to be swingable around a rotation axis Rx; and at least one drive part 6A which has a magnet 7A provided at the pendulum and a coil 8, which is provided at a structure other than the pendulum and disposed facing the magnet without contacting with the magnet, and applies driving force to the pendulum. The pendulum has: a tip part 516 which is an end at the opposite side of the rotation axis with respect to a center of the pendulum extending from the rotation axis in an extension direction, in which the pendulum extends, of directions intersecting with the rotation axis; and a first side surface part 517 and a second side surface part 518 which are ends intersecting with a direction parallel to the rotation axis and arranged at the sides opposite to each other. The at least one drive part includes a first drive part 61. The first drive part has: a first magnet 7A1 which is a magnet and provided spaced apart from the rotation axis at the first side surface part; and a first coil which is a coil and disposed facing the first magnet without contacting with the first magnet.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a vibration generator, a vibration reduction device, and an electronic device.

Background Art

[0002] Conventionally, a vibration actuator for realizing the vibration function of an electronic device has been known (for example, see Patent Document 1). The vibration actuator described in Patent Document 1 includes a fixed body and a movable body supported by the fixed body so as to swing about a shaft portion provided on the fixed body as a fulcrum. The movable body is movably supported with respect to the fixed body by a magnetic spring due to the attractive force of a magnet. The movable body includes a core that is a magnetic body and a coil wound around the core, and when currents of different frequencies are applied to the coil, the movable body moves around a shaft portion passing through a through hole of the core. A flexible substrate for supplying power to the coil is provided at one end of the core.

[0003] The fixed body is configured by combining a base plate and a case. The fixed body includes a magnet and a buffer portion. The magnet moves the movable body by cooperating with the coil of the movable body. The free end of the vibrating movable body contacts the buffer portion. Thereby, the vibration of the movable body can be transmitted to the housing of the vibration actuator, and the buffer portion can generate a large vibration.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the vibration actuator described in Patent Document 1, the magnet is mounted on a stationary body, and the coil is wound around a core that constitutes a movable body. Furthermore, the flexible substrate mounted on the core vibrates together with the movable body. Due to this configuration, the vibration of the vibration actuator may adversely affect the wiring connections that supply power to the coil in the long term. Therefore, there has been a demand for vibration generators that can improve reliability. [Means for solving the problem]

[0006] A vibration generating device according to a first aspect of the present disclosure comprises a base that transmits vibration to an object, a pendulum provided on the base so as to be swingable about a rotation axis, a magnet provided on the pendulum, and a coil provided in a component other than the pendulum and positioned opposite the magnet without contact, and at least one drive unit that applies a driving force to the pendulum, wherein the pendulum has a tip portion which is the end opposite to the rotation axis with respect to the center of the pendulum that extends from the rotation axis in the extension direction in which the pendulum extends from the rotation axis, and a first side portion and a second side portion which are ends that intersect in a direction parallel to the rotation axis and are opposite to each other, and the at least one drive unit includes a first drive unit which is the magnet and has a first magnet provided on the first side portion spaced apart from the rotation axis, and a coil which has a first coil positioned opposite the first magnet without contact.

[0007] A vibration reduction device according to a second aspect of this disclosure comprises a vibration generating device according to the first aspect, a detection unit for detecting vibrations of the object, and an operation control unit for generating vibrations in the vibration generating device that are in the opposite phase to the vibrations detected by the detection unit.

[0008] The electronic device according to the third aspect of this disclosure comprises the vibration reduction device according to the second aspect described above. [Brief explanation of the drawing]

[0009] [Figure 1]A perspective view showing a projector according to the first embodiment. [Figure 2] A perspective view showing the main body of the vibration reduction device according to the first embodiment. [Figure 3] A plan view showing the main body of the device with the lid member removed according to the first embodiment. [Figure 4] A perspective view showing a vibration generating device according to the first embodiment. [Figure 5] A plan view showing a vibration generating device according to the first embodiment. [Figure 6] A perspective view showing a vibration generating device with the pendulum removed according to the first embodiment. [Figure 7] A perspective view showing a pendulum according to the first embodiment. [Figure 8] A side view showing a pendulum according to the first embodiment. [Figure 9] A perspective view showing the drive unit according to the first embodiment. [Figure 10] A cross-sectional view showing the drive unit according to the first embodiment. [Figure 11] A diagram showing the coils constituting the drive unit according to the first embodiment. [Figure 12] A diagram showing a drive unit according to a first modified example of the first embodiment. [Figure 13] A diagram showing a drive unit according to a second modified example of the first embodiment. [Figure 14] A diagram showing a drive unit according to a second modified example of the first embodiment. [Figure 15] A diagram showing a drive unit according to a second modified example of the first embodiment. [Figure 16] A diagram showing a drive unit according to a second modified example of the first embodiment. [Figure 17] A diagram showing a vibration generating device according to a third modified example of the first embodiment. [Figure 18] A plan view showing a vibration generating device according to the second embodiment. [Figure 19] A plan view showing a vibration generating device according to the third embodiment. [Figure 20] A plan view showing a vibration generating device according to the fourth embodiment. [Figure 21]A diagram showing a vibration generator according to a modification of the fourth embodiment.

Embodiments for Carrying Out the Invention

[0010] [First Embodiment] Hereinafter, the first embodiment of the present disclosure will be described based on the drawings. [Schematic Configuration of Projector] FIG. 1 is a perspective view showing a projector 1 according to this embodiment. The projector 1 according to this embodiment is an electronic device that modulates light emitted from a light source to form image light corresponding to image information and enlarges and projects the formed image light onto a projection surface. As shown in FIG. 1, the projector 1 includes an exterior housing 11, a projection optical device 12, and a vibration reduction device 2. In addition, although not shown, the projector 1 includes a light source, a light modulation device, a power supply device, a cooling device, and a control device. The light modulation device modulates the light emitted from the light source to form image light corresponding to image information. The power supply device supplies power to the electronic components of the projector 1. The cooling device cools the cooling target provided inside the projector 1. The control device controls the operation of the projector 1.

[0011] [Configuration of Exterior Housing] The exterior housing 11 constitutes the exterior of the projector 1 and houses the above-described light source, light modulation device, power supply device, cooling device, and control device inside. The exterior housing 11 is formed in a substantially rectangular parallelepiped shape. The exterior housing 11 has a connection terminal 112 to which a cable 28 of the vibration reduction device 2 described later is connected on a surface 111 in the projection direction of the image by the projection optical device 12. The connection terminal 112 is, for example, a USB (Universal Serial Bus) terminal and supplies power to the vibration reduction device 2.

[0012] [Configuration of Projection Optical Device] The projection optical device 12 projects the image light formed by the optical modulation device described above onto the projection surface. In this embodiment, the projection optical device 12 is detachably mounted to the outer casing 11. That is, the projection optical device 12 is replaceable. The projection optical device 12 shown in Figure 1 sequentially bends the direction of propagation of the image light incident on the projection optical device 12 in two stages, projecting the image light in the opposite direction to the direction of incidence of the image light to the projection optical device 12. In other words, the projection optical device 12 is configured in a roughly U-shape, rotated 90° counterclockwise when viewed from the side. The projection optical device 12 includes a lens barrel 121, and also includes a plurality of lenses and a plurality of reflective members provided inside the lens barrel 121, although these are not shown in the illustration.

[0013] [Configuration of the vibration reduction device] The vibration reduction device 2 is attached to the object to be vibration-reduced and reduces the vibration of the object by generating vibrations that are in the opposite phase to the vibrations acting on the object. In this embodiment, the vibration reduction device 2 is installed on the lens barrel 121 and reduces the vibrations acting on the lens barrel 121. In this case, if vibrations are transmitted to the projector 1 from an external source, or if vibrations are generated due to internal factors such as the fan of the projector 1, the projection optical device 12, which is provided to protrude from the outside of the outer casing 11, is more susceptible to vibration than the outer casing 11. When the projection optical device 12 vibrates in this way, the image projected onto the projection surface by the projection optical device 12 will shake considerably. To address these issues, in this embodiment, the vibration reduction device 2 is provided on the projection optical device 12 to reduce vibrations of the projection optical device 12, thereby suppressing image shaking. The configuration of the vibration reduction device 2 will be described in detail below.

[0014] The vibration reduction device 2 comprises a device body 21, a cable 28, and a fixing device 29. Cable 28 extends from the main body of the device 21. Cable 28 is connected to the connection terminal 112 and supplies power supplied from the connection terminal 112 to the main body of the device 21. The fixing device 29 secures the main body 21 of the device to be vibration-reduced. In this embodiment, the fixing device 29 is made of a belt and is wrapped around the outer surface of the lens barrel 121 of the projection optical device 12, which is the object of vibration reduction. However, the fixing device 29 is not limited to this and may be a fastening member such as a screw, as long as it can secure the housing 22 to the object of vibration reduction.

[0015] Figure 2 is a perspective view showing the main body of the device 21, and Figure 3 is a plan view showing the main body of the device 21 with the lid member 24 removed. The main body of the device 21 generates vibrations that are in the opposite phase to the vibrations of the lens barrel 121, thereby reducing the vibrations of the lens barrel 121. As shown in Figure 2, the main body of the device 21 includes a housing 22 and a detection unit 25, and as shown in Figure 3, it also includes an operation control unit 26 and a vibration generator 3A. The housing 22 houses the detection unit 25, the motion control unit 26, and the vibration generator 3A. As shown in Figure 2, the housing 22 comprises a frame 23 and a lid member 24, and the frame 23 and the lid member 24 are combined to form a roughly rectangular parallelepiped shape. The lid member 24 is formed in the shape of a rectangular plate and is detachably attached to the first surface 23A of the frame 23.

[0016] As shown in Figures 2 and 3, the frame 23 is formed in the shape of a rectangular frame having a first surface 23A, a second surface 23B, a third surface 23C, a fourth surface 23D, a fifth surface 23E, and a sixth surface 23F. The first surface 23A and the second surface 23B are opposite surfaces to each other. The third surface 23C and the fourth surface 23D are opposite surfaces to each other, and the fifth surface 23E and the sixth surface 23F are opposite surfaces to each other. As shown in Figure 2, the frame 23 has a fixing device mounting portion 231, a sensor mounting portion 232, and a terminal portion 233.

[0017] The fastener mounting portion 231 is a rod-shaped portion provided on the third surface 23C side and the fourth surface 23D side of the frame 23. The end of the fastener 29 is attached to each fastener mounting portion 231. The sensor mounting section 232 is located on the third surface 23C. The detection unit 25 is attached to the sensor mounting section 232. The terminal section 233 is located approximately in the center of the sixth surface 23F. A cable 28 is connected to the terminal section 233, and power is supplied from the connection terminal 112 via the cable 28.

[0018] The detection unit 25 detects vibrations acting on the vibration reduction device 2. The detection unit 25 comprises a printed circuit board 251 and a sensor (not shown) provided on the printed circuit board 251. The printed circuit board 251 is attached to the sensor mounting section 232 and outputs the vibration direction and amplitude detected by the sensor to the motion control unit 26. Examples of sensors included in the detection unit 25 include an acceleration sensor and a gyroscope.

[0019] As shown in Figure 3, the frame 23 further includes an arrangement section 234 and a mounting section 235. The placement section 234 and the mounting section 235 are covered by a cover member 24 attached to the first surface 23A. In other words, the placement section 234 and the mounting section 235 are exposed when the cover member 24 is removed from the frame 23. The operation control unit 26 is located in the arrangement section 234. A vibration generator 3A is attached to the mounting section 235.

[0020] The motion control unit 26 is a printed circuit board on which multiple circuit elements are mounted, and is located in the placement section 234. The motion control unit 26 controls the operation of the vibration reduction device 2. Specifically, the motion control unit 26 operates the vibration generator 3A based on the detection results from the detection unit 25. More specifically, the motion control unit 26 supplies driving power to the vibration generator 3A and operates the vibration generator 3A to generate vibrations that are in the opposite phase to the vibrations detected by the detection unit 25.

[0021] [Configuration of the vibration generating device] Figure 4 is a perspective view showing the vibration generator 3A, and Figure 5 is a plan view showing the vibration generator 3A. The vibration generator 3A is attached to a mounting portion 235 provided within the frame 23. Under the control of the motion control unit 26, the vibration generator 3A generates vibrations that reduce the vibration of the lens barrel 121, which is the object to be vibration-reduced. As shown in Figures 4 and 5, the vibration generator 3A comprises a base 4A, a pendulum 5A, and at least one drive unit 6A. In the following explanation, the three mutually orthogonal directions will be referred to as the +X direction, the +Y direction, and the +Z direction. The +X direction is the direction along the rotation axis Rx of the pendulum 5A, and is the direction from the third surface 23C to the fourth surface 23D as described above. The +Y direction is the direction perpendicular to the base 4A, and is the direction from the second surface 23B to the first surface 23A as described above. The +Z direction is the direction in which the pendulum 5A extends from the rotation axis Rx as viewed from the +Y direction, and is the direction from the fifth surface 23E to the sixth surface 23F as described above. Although not shown in the diagram, the opposite direction of the +X direction is referred to as the -X direction, the opposite direction of the +Y direction is referred to as the -Y direction, and the opposite direction of the +Z direction is referred to as the -Z direction.

[0022] [Base configuration] Figure 6 is a perspective view showing the vibration generator 3A with the pendulum 5A removed. The base 4A is a plate-shaped member formed in a flat plate shape. The base 4A transmits vibrations generated by the vibration generator 3A to the object on which the base 4A is installed, i.e., the frame 23. The base 4A supports the pendulum 5A and the drive unit 6A and is attached to the mounting part 235 (Figure 3). The base 4A has a pair of support parts 41, fixing parts 42-44 and a relief part 45. A pair of support parts 41 rotatably support the -Z end of the pendulum 5A. The pair of support parts 41 are located on the base 4A at the -Z end and in the +X direction, sandwiching the -Z end of the pendulum 5A. Each of the pair of support parts 41 has a pin 411 that forms the rotation axis Rx of the pendulum 5A, as shown in Figure 6. Of the pair of support parts 41, the pin 411 of the support part 41L, which is positioned in the -X direction, protrudes from the support part 41L in the +X direction, and the pin 411 of the support part 41R, which is positioned in the +X direction, protrudes from the support part 41R in the -X direction. Each pin 411 is inserted into the pendulum 5A, thereby supporting the pendulum 5A so as to be rotatable about the rotation axis Rx along the +X direction.

[0023] Each of the fixing parts 42 to 44 is a part on the base 4A capable of fixing the holding member 92 of the drive unit 6A, as shown in Figures 4 to 6. Fixing part 42 is provided at the end of the base 4A in the +Z direction. Fixing part 43 is provided at the end of the base 4A in the +X direction, and fixing part 44 is provided at the end of the base 4A in the -X direction. Specifically, the fixed portion 43 is the part of the support portion 41 that extends from the end in the +X direction along the rotation axis Rx in the +Z direction, which is the direction in which the pendulum 5A extends from the rotation axis Rx. The fixed portion 44 is the part of the support portion 41 that extends from the end in the -X direction along the rotation axis Rx in the +Z direction, which is the direction in which the pendulum 5A extends from the rotation axis Rx. The fixed portion 42 is the part that connects the ends of the fixed portions 43 and 44 on the opposite side from the support portion 41.

[0024] The relief portion 45 is provided between a pair of support portions 41 and a fixed portion 42 in the +Z direction. More specifically, the relief portion 45 is provided in the portion enclosed by the pair of support portions 41 and fixed portions 42-44. The relief portion 45 is a portion that prevents the portion of the pendulum 5A in the +Z direction and the magnet 7A (described later) from contacting the base 4A when the pendulum 5A swings around the rotation axis Rx. In this embodiment, the relief portion 45 is an opening that penetrates the base 4A along the +Y direction. However, it is not limited to this, and the relief portion 45 may be a recess that opens in the direction opposite to the direction facing the pendulum 5A. Specifically, the relief portion 45 may be a recess that opens in the +Y direction or the -Y direction. Even if the relief portion 45 is a recess, the relief portion 45 can be configured so that the portion of the pendulum 5A in the +Z direction and the magnet 7A do not contact the base 4A.

[0025] [Pendulum Structure] Figure 7 is a perspective view showing pendulum 5A. Figure 8 is a side view of pendulum 5A as seen from the +X direction. The pendulum 5A is supported on the base 4A so as to be able to swing around the rotation axis Rx and extends in the +Z direction from the rotation axis Rx. The pendulum 5A generates vibration by being swung around the rotation axis Rx by the drive unit 6A. As shown in Figures 7 and 8, the pendulum 5A has an arm 51 and a weight 52.

[0026] As shown in Figure 7, the arm 51 is formed in a substantially T-shape, with the end in the +Z direction being larger than the end in the -Z direction when viewed from the +Y direction. As shown in Figures 7 and 8, the arm 51 has a connecting portion 511, an extension portion 512, an enlarged portion 513, positioning portions 514, 515, a tip portion 516, a first side portion 517, and a second side portion 518. The connecting portion 511 is the part of the arm 51 that is supported by a pair of support portions 41. In this embodiment, the connecting portion 511 is provided at the end of the arm 51 in the -Z direction. Holes 5111 are provided on both the surface of the connecting portion 511 facing the +X direction and the surface of the connecting portion 511 facing the -X direction. A bearing BR (see Figure 6) is placed inside each hole 5111. The pins 411 of each support portion 41 are inserted into the bearing BR via washers (not shown), thereby supporting the arm 51, and consequently the pendulum 5A, on the pair of support portions 41.

[0027] The extension portion 512 is the portion extending from the connecting portion 511 to the enlarged portion 513. The dimension of the extension portion 512 along the +X direction is smaller than the dimension of the enlarged portion 513 along the +X direction, and the dimension of the extension portion 512 along the +X direction is the same in the range from the connecting portion 511 to the enlarged portion 513. The extension portion 512 is provided with a through hole 5121 in order to reduce the weight of the pendulum 5A and to position the center of gravity of the pendulum 5A more in the +Z direction. However, this is not the only option, and a recess may be provided instead of the through hole 5121, or the through hole 5121 may be omitted.

[0028] The enlarged portion 513 is the part of the arm 51 in the +Z direction. The dimensions of the enlarged portion 513 along the +X direction are larger than the dimensions of the connecting portion 511 along the +X direction. The center of gravity of a pendulum 5A having such an enlarged portion 513 is located in the +Z direction rather than at the midpoint between the rotation axis Rx and the end of the pendulum 5A in the +Z direction. In other words, regardless of the configuration and arrangement of the weight portion 52, the center of gravity of the pendulum 5A is located closer to the tip portion 516 than at the midpoint between the rotation axis Rx and the end of the pendulum 5A on the tip portion 516 side.

[0029] The arrangement portion 514 is provided on the +Y direction surface of the enlarged portion 513, and the arrangement portion 515 is provided on the -Y direction surface of the enlarged portion 513. The arrangement portion 514 is a recess in the -Y direction from the +Y direction surface of the enlarged portion 513, and is formed in a substantially square shape when viewed from the +Y direction. The arrangement portion 515 is a recess in the +Y direction from the -Y direction surface of the enlarged portion 513, and is formed in a substantially square shape when viewed from the -Y direction. A weight portion 52 is arranged in at least one of the arrangement portions 514 and 515. That is, the arrangement portions 514 and 515 are provided at positions spaced apart from the rotation axis Rx toward the tip portion 516, and are portions where the weight portion 52 can be arranged.

[0030] The weight portion 52 is composed of at least one weight member 53. That is, the weight and center of gravity of the weight portion 52 are adjusted according to the number and arrangement of the weight members 53 that make up the weight portion 52. The weight member 53 is formed in a substantially rectangular parallelepiped shape with a longitudinal axis along the +X direction, and is positioned along the +X direction in one of the placement sections 514 and 515. The weight member 53 has a through hole 531 that penetrates the weight member 53 along the +Y direction. The weight member 53 is fixed to one of the placement sections 514 and 515 by a screw S1 that passes through the through hole 531. Furthermore, the arrangement section 514 can accommodate three weight members 53 along the +Z direction, and additional weight members 53 can be arranged in the +Y direction relative to the weight members 53 arranged in the arrangement section 514. When multiple weight members 53 are arranged in the +Y direction, the screw S1 is fixed to the arrangement section 514 with the screw S1 inserted through the through hole 531 of each weight member 53. The arrangement section 515 is similar. With this configuration, the number and arrangement of weight members 53 provided on the pendulum 5A can be adjusted.

[0031] The tip 516 is the end opposite to the rotation axis Rx in the direction of extension of the pendulum 5A (+Z direction) in the direction intersecting the rotation axis Rx, with respect to the center of the pendulum 5A extending from the rotation axis Rx. In other words, the tip 516 is the end of the arm 51 facing the +Z direction, and is the free end of the arm 51. The tip portion 516 has a mounting portion 5161 that is recessed in the -Z direction. A plate member similar to the plate member 91 of the drive unit 6A can be attached to the mounting portion 5161. The case in which the plate member 91 is attached to the mounting portion 5161 will be described in detail in the second embodiment.

[0032] The first side portion 517 and the second side portion 518 are ends that intersect in a direction parallel to the rotation axis Rx (+X direction) and are on opposite sides of each other. More specifically, the first side portion 517 is the side portion of the enlarged portion 513 facing the +X direction, and the second side portion 518 is the side portion of the enlarged portion 513 facing the -X direction. The first side portion 517 has a mounting portion 5171 that is recessed in the -X direction. The plate member 91 of the first drive unit 61 is attached to the mounting portion 5171. The second side portion 518 has a mounting portion 5181 that is recessed in the +X direction. The plate member 91 of the second drive unit 62 is attached to the mounting portion 5181.

[0033] [Configuration of the drive unit] Figure 9 is a perspective view showing the drive unit 6A, and Figure 10 is a cross-sectional view showing the drive unit 6A. The drive unit 6A causes the pendulum 5A, supported by the base 4A, to swing around the rotation axis Rx. At least one drive unit 6A is provided in the vibration generating device 3A. In other words, the vibration generating device 3A comprises at least one drive unit 6A. As shown in Figures 9 and 10, the drive unit 6A includes a magnet 7A, a coil 8A, a plate member 91, a holding member 92, and a terminal portion 93. In addition, the drive unit 6A includes a control unit (not shown).

[0034] [Magnet composition] The magnet 7A is positioned on the pendulum 5A at a distance from the rotation axis Rx by the plate member 91. The magnet 7A causes the pendulum 5A to swing around the rotation axis Rx by attracting or repelling the magnetic force generated by the coil 8A. The magnet 7A is composed of a first magnetic member 7A1 and a second magnetic member 7A2. Each of the first magnet member 7A1 and the second magnet member 7A2 is formed in a substantially rectangular parallelepiped shape with a longitudinal axis. The dimensions of the first magnet member 7A1 along the longitudinal axis and the dimensions of the second magnet member 7A2 along the longitudinal axis are substantially the same as the dimensions of the coil 8A along the same direction.

[0035] In the first magnetic member 7A1, the surface 7A11 (Figure 10) facing the coil 8A faces the first extended portion 8A1 of the coil 8A, which will be described later. In this embodiment, the magnetic pole of surface 7A11 is the south pole. The second magnet member 7A2 is positioned spaced apart from the first magnet member 7A1 in the -Y direction. More specifically, the second magnet member 7A2 is spaced apart from the first magnet member 7A1 in the coil 8A in the -Y direction from the first extension portion 8A1 toward the second extension portion 8A2, which will be described later. The surface 7A21 (Figure 10) of the second magnet member 7A2 that faces the coil 8A faces the second extension portion 8A2 of the coil 8A. In this embodiment, the magnetic pole of surface 7A21 is the north pole. That is, the magnetic pole of surface 7A11 that faces the first extension portion 8A1 of the first magnet member 7A1 is different from the magnetic pole of surface 7A21 that faces the second extension portion 8A2 of the second magnet member 7A2.

[0036] [Composition of plate members] The plate member 91 is formed in a flat shape. The plate member 91 supports the magnet 7A and is attached to the arm 51 of the pendulum 5A. In this way, the magnet 7A is attached to the pendulum 5A. The plate member 91 functions as a yoke for the magnet 7A. That is, the plate member 91 is a magnet-side yoke provided on the opposite side of the coil 8A from the magnet 7A.

[0037] [Coil Configuration] Figure 11 shows the coil 8A that constitutes the drive unit 6A. The coil 8A is provided in a configuration other than the pendulum 5A. In this embodiment, the coil 8A is fixed to the base 4A by a holding member 92. The coil 8A is positioned opposite the magnet 7A in a non-contact manner and generates a magnetic field that acts on the magnet 7A. As shown in Figure 11, coil 8A is an air-core coil constructed by winding a conductor planarly in a track-like or oval shape with a longitudinal axis when viewed from the magnet 7A. Therefore, when viewed from the magnet 7A, the dimensions of coil 8A along the longitudinal axis are larger than the dimensions of coil 8A along the transverse axis perpendicular to the longitudinal axis.

[0038] Such a coil 8A has a first extended portion 8A1 and a second extended portion 8A2. The first extension portion 8A1 is a part that extends linearly along the longitudinal axis of the coil 8A. The first extension portion 8A1 is positioned in the +Y direction with respect to the air core portion SP of the coil 8A. The second extension portion 8A2 is located on the opposite side of the first extension portion 8A1, with the air core portion SP of the coil 8A in between. That is, the second extension portion 8A2 is located in the -Y direction relative to the first extension portion 8A1. The second extension portion 8A2 extends linearly along the longitudinal axis of the coil 8A. The dimensions of the second extension portion 8A2 along the longitudinal axis of the coil 8A are approximately the same as the dimensions of the first extension portion 8A1 along the longitudinal axis of the coil 8A. When current is supplied to the coil 8A by the control unit, the direction of the current in the second extension portion 8A2 is opposite to the direction of the current in the first extension portion 8A1. In this embodiment, coil 8A is an air-core coil without a core as described above, but it may also be a coil having a core between the first extension portion 8A1 and the second extension portion 8A2.

[0039] [Configuration of the holding member] The holding member 92 is fixed to one of the fixing parts 42 to 44 while holding the coil 8A and the terminal part 93. The holding member 92 has a first plate-shaped part 921 perpendicular to the +Y direction and a second plate-shaped part 922 that rises from the first plate-shaped part 921 in the +Y direction. The holding member 92 is made of a ferromagnetic material and is formed in a substantially L-shape when viewed from the side. The -Y-direction surface of the first plate-like portion 921 is in contact with one of the fixing portions 42 to 44. A terminal portion 93 is attached to the +Y-direction surface of the first plate-like portion 921. In the second plate-shaped portion 922, the coil 8A is attached to the surface in the direction opposite to the direction in which the first plate-shaped portion 921 extends from the second plate-shaped portion 922. That is, the coil 8A is attached to the surface of the second plate-shaped portion 922 that faces the magnet 7A. Since the holding member 92 is made of a ferromagnetic material, the second plate-shaped portion 922 functions as a yoke that controls the direction of the magnetic field generated by the coil 8A. In other words, the vibration generating device 3A includes a holding member 92 having a second plate-shaped portion 922 which is a coil-side yoke positioned on the opposite side of the coil 8A from the magnet 7A, and the holding member 92 is a ferromagnetic holding member that holds the coil 8A.

[0040] [Terminal section configuration] The terminal section 93 is electrically connected to the operation control unit 26 of the vibration reduction device 2 and supplies the current supplied from the operation control unit 26 to a control unit (not shown). The control unit generates a magnetic field in the coil 8A by energizing the coil 8A, thereby providing a driving force to the pendulum 5A, which is equipped with a magnet 7A, and causing the pendulum 5A to swing. More specifically, the control unit energizes the coil 8A with alternating current, and alternately reverses the direction of the magnetic field generated by the coil 8A, thereby causing the pendulum 5A to swing around the rotation axis Rx. In other words, the control unit alternately switches the direction of the current supplied to the coil 8A.

[0041] When an alternating current is passed through coil 8A, a magnetic field is generated that extends from one of the first extended portion 8A1 and the other extended portion 8A2 towards the other. That is, one extended portion becomes the north pole and the other becomes the south pole. The control unit then alternately switches the magnetic poles of the first extended portion 8A1 and the second extended portion 8A2 by passing an alternating current of a predetermined frequency through coil 8A. As described above, the magnetic poles of the surface 7A11 of the first magnet member 7A1 that faces the first extended portion 8A1 in a non-contact manner are different from the magnetic poles of the surface 7A21 of the second magnet member 7A2 that faces the second extended portion 8A2 in a non-contact manner.

[0042] Therefore, when an alternating current is passed through the coil 8A, the pendulum 5A, to which the magnet 7A is attached by the plate member 91, swings around the rotation axis Rx in accordance with the frequency of the alternating current. The frequency of the alternating current that flows through the coil 8A is set by the motion control unit 26 according to the vibration detected by the detection unit 25 of the vibration reduction device 2. As a result, the vibration generator 3A can generate vibrations that are in the opposite phase to the vibrations transmitted to the projection optical device 12, thereby reducing the vibrations of the projection optical device 12.

[0043] [Specific arrangement of the first and second drive units] As described above, the vibration generator 3A comprises at least one drive unit 6A. In this embodiment, the vibration generator 3A comprises a plurality of drive units 6A, and the plurality of drive units 6A include a first drive unit 61 and a second drive unit 62. In other words, the first drive unit 61 and the second drive unit 62 are each one of the multiple drive units 6A of the vibration generating device 3A. The first drive unit 61 is provided in the +X direction relative to the pendulum 5A, and the second drive unit 62 is provided in the -X direction relative to the pendulum 5A.

[0044] Specifically, the first drive unit 61 includes a magnet 7A, a coil 8A, a plate member 91, a holding member 92, and a terminal portion 93, as well as a control unit (not shown). The magnet 7A of the first drive unit 61 corresponds to the first magnet, and the coil 8A of the first drive unit 61 corresponds to the first coil. In the first drive unit 61, the plate member 91 is attached to a mounting portion 5171 provided on the first side portion 517 of the arm 51. The first magnetic member 7A1 and the second magnetic member 7A2, which constitute the magnet 7A, are fixed to the +X direction surface of the plate member 91 such that the longitudinal axes of each magnetic member 7A1 and 7A2 are aligned in the +Z direction. In other words, the magnet 7A of the first drive unit 61 is provided on the first side surface 517 spaced apart from the rotation axis Rx. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 43 of the base 4A. The coil 8A is attached to the second plate-shaped portion 922 of the holding member 92 on the -X direction surface facing the magnet 7A, so as to face the magnet 7A without contact. More specifically, the coil 8A is arranged such that the first extended portion 8A1 faces the first magnet member 7A1 without contact in the +X direction, and the second extended portion 8A2 faces the second magnet member 7A2 without contact in the +X direction. As described above, the magnetic poles on the surface of the first magnetic member 7A1 facing the first extended portion 8A1 are different from the magnetic poles on the surface of the second magnetic member 7A2 facing the second extended portion 8A2.

[0045] The second drive unit 62 includes a magnet 7A, a coil 8A, a plate member 91, a holding member 92, and a terminal portion 93, as well as a control unit (not shown). The magnet 7A of the second drive unit 62 corresponds to the second magnet, and the coil 8A of the second drive unit 62 corresponds to the second coil. In the second drive unit 62, the plate member 91 is attached to a mounting portion 5181 provided on the second side portion 518 of the arm 51. The first magnetic member 7A1 and the second magnetic member 7A2, which constitute the magnet 7A, are fixed to the -X direction surface of the plate member 91 such that the longitudinal axes of each magnetic member 7A1 and 7A2 are aligned in the +Z direction. That is, the magnet 7A of the second drive unit 62 is provided on the second side surface 518 spaced apart from the rotation axis Rx. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 44 of the base 4A. The coil 8A is attached to the surface of the second plate-shaped portion 922 of the holding member 92 facing the magnet 7A in the +X direction, so as to face the magnet 7A without contact. More specifically, the coil 8A is arranged such that the first extended portion 8A1 faces the first magnet member 7A1 without contact in the +X direction, and the second extended portion 8A2 faces the second magnet member 7A2 without contact in the +X direction. As described above, the magnetic poles on the surface of the first magnetic member 7A1 facing the first extended portion 8A1 are different from the magnetic poles on the surface of the second magnetic member 7A2 facing the second extended portion 8A2.

[0046] [Synchronization between the first drive unit and the second drive unit] The control unit of the first drive unit 61 generates a magnetic field in coil 8A by passing an alternating current through coil 8A of the first drive unit 61. The control unit of the second drive unit 62 generates a magnetic field in coil 8A by passing an alternating current through coil 8A of the second drive unit 62. At this time, each control unit passes an alternating current of the same frequency and phase through each coil 8A so that the first extension portion 8A1 of coil 8A of the first drive unit 61 and the first extension portion 8A1 of coil 8A of the second drive unit 62 have the same magnetic pole, and the second extension portion 8A2 of coil 8A of the first drive unit 61 and the second extension portion 8A2 of coil 8A of the second drive unit 62 have the same magnetic pole. This prevents the first drive unit 61 and the second drive unit 62 from hindering the swinging of the pendulum 5A by the other drive unit. In addition, since the pendulum 5A can be swung by the driving force of each drive unit 61 and 62, the rotational torque during the swing of the pendulum 5A can be increased. Note that the drive units 61 and 62 may share a single control unit.

[0047] [Effects of the First Embodiment] The projector 1 according to this embodiment, as described above, provides the following effects. Projector 1 is an electronic device. Projector 1 is equipped with a vibration reduction device 2. The vibration reduction device 2 comprises a vibration generator 3A, a detection unit 25, and an operation control unit 26. The detection unit 25 detects vibrations of the projection optical device 12, which is the target object. The operation control unit 26 causes the vibration generator 3A to generate vibrations that are in the opposite phase to the vibrations detected by the detection unit 25.

[0048] The vibration generating device 3A comprises a base 4A, a pendulum 5A, and at least one drive unit 6A. The base 4A transmits vibrations generated by the swinging of the pendulum 5A to the frame 23, which is the object to be processed. The pendulum 5A is mounted on the base 4A so as to be able to swing about a rotation axis Rx. The pendulum 5A has a tip 516, a first side portion 517, and a second side portion 518. The tip 516 is the end opposite to the rotation axis Rx in the extension direction (+Z direction) in which the pendulum 5A extends from the rotation axis Rx, in a direction intersecting the rotation axis Rx. The first side portion 517 and the second side portion 518 are ends that intersect in a direction parallel to the rotation axis Rx and are on opposite sides of each other. At least one drive unit 6A has a magnet 7A provided on the pendulum 5A and a coil 8A provided on a component other than the pendulum 5A and positioned opposite the magnet 7A without contact, thereby providing a driving force to the pendulum 5A. Such a drive unit 6A includes a first drive unit 61. The first drive unit 61 has a magnet 7A as a first magnet and a coil 8A as a first coil. In the first drive unit 61, the magnet 7A is provided on the first side surface 517 spaced apart from the rotation axis Rx, and the coil 8A is positioned opposite the magnet 7A without contact.

[0049] In this configuration, the magnet 7A, which is in contact with the coil 8A and acts with the magnetic force generated by the coil 8A, is provided on the pendulum 5A. This eliminates the need to provide wiring to supply current to the pendulum 5A, which is supported by the base 4A so as to be able to swing around the rotation axis Rx. Therefore, damage to the wiring supplying current to the coil 8A during the swing of the pendulum 5A can be suppressed, and the pendulum 5A can be swung reliably. Consequently, the reliability of the vibration generator 3A can be increased. Furthermore, this allows the vibration generator 3A to generate vibrations stably, so it is possible to generate vibrations that are out of phase with the vibrations detected by the detection unit 25. Consequently, the vibration of the projector 1 can be reduced.

[0050] The vibration generating device 3A includes at least one drive unit 6A, which includes a second drive unit 62. The second drive unit 62 has a magnet 7A as a second magnet and a coil 8A as a second coil. In the second drive unit 62, the magnet 7A is provided on the second side surface 518 spaced apart from the rotation axis Rx, and the coil 8A is positioned opposite the magnet 7A without contact. With this configuration, the vibration generator 3A comprises a first drive unit 61 and a second drive unit 62, and the pendulum 5A is swung about the rotation axis Rx by the first drive unit 61 and the second drive unit 62. At this time, the magnet 7A of the first drive unit 61 is provided on the first side surface 517 of the pendulum 5A, and the magnet 7A of the second drive unit 62 is provided on the second side surface 518 of the pendulum 5A, which is located on the opposite side of the first side surface. In other words, the first drive unit 61 and the second drive unit 62 are provided on either side of the pendulum 5A in a direction along the rotation axis Rx. This allows the pendulum 5A to swing stably. In addition, since the pendulum 5A can be swung by multiple drive units 61 and 62, the swing of the pendulum 5A can be increased, and the torque during the swing of the pendulum 5A can be increased. Therefore, the vibration generated by the vibration generator 3A can be increased.

[0051] The vibration generator 3A includes a control unit that synchronously and alternately switches the direction of the current flowing through the multiple coils 8A. That is, the control unit of the first drive unit 61 and the control unit of the second drive unit 62 synchronously and alternately switch the direction of the current flowing through the coil 8A of the first drive unit 61 and the direction of the current flowing through the coil 8A of the second drive unit 62. In other words, alternating current flows through the coil 8A of the first drive unit 61 and the coil 8A of the second drive unit 62. With this configuration, the direction of the magnetic force generated in each coil 8A can be alternately reversed. This prevents the magnetic force generated in the coil 8A of the second drive unit 62 from hindering the swing of the pendulum 5A with respect to the magnetic force generated in the coil 8A of the first drive unit 61. Therefore, the magnetic force generated in the coil 8A of the first drive unit 61 and the magnetic force generated in the coil 8A of the second drive unit 62 can cause the pendulum 5A to swing stably, and the torque during the swing of the pendulum 5A can be increased.

[0052] In the vibration generator 3A, the coil 8A is attached to the base 4A. With this configuration, the coil 8A can be stably positioned opposite the magnet 7A in a non-contact manner.

[0053] The vibration generating device 3A includes a plate member 91 and a holding member 92. The plate member 91 corresponds to the magnet-side yoke and is provided at a position opposite to the coil 8A relative to the magnet 7A. The holding member 92 corresponds to the coil-side yoke and is provided at a position opposite to the magnet 7A relative to the coil 8A. With this configuration, the plate member 91 acting as the magnet-side yoke can increase the attractive force of the magnet 7A, and the holding member 92 acting as the coil-side yoke can direct the magnetic force generated in the coil 8A towards the magnet 7A. Therefore, the interaction between the magnetic force generated in the coil 8A and the magnet 7A provided on the pendulum 5A can be strengthened, and the current supplied to the coil 8A to swing the pendulum 5A can be reduced.

[0054] In the vibration generator 3A, the retaining member 92, which is the coil-side yoke, is a ferromagnetic retaining member that holds the coil 8A. With this configuration, since the coil 8A is held by the holding member 92, there is no need to provide the member that holds the coil 8A and the coil-side yoke separately. Therefore, the increase in the number of parts of the vibration generating device 3A can be suppressed.

[0055] In the vibration generator 3A, the coil 8A is an air-core coil with a longitudinal axis. The magnet 7A is positioned along the longitudinal axis of the coil 8A and faces the coil 8A in a non-contact manner. With this configuration, the cost of coil 8A can be reduced compared to a coil with a core, and consequently, the manufacturing cost of the vibration generator 3A can be reduced. Furthermore, by positioning the magnet 7A along the longitudinal axis of the coil 8A, the surface area of ​​the magnet 7A that interacts with the magnetic force generated by the coil 8A can be increased, thereby enhancing the interaction between the coil 8A and the magnet 7A.

[0056] In the vibration generating device 3A, the coil 8A has a first extending portion 8A1 that extends along the longitudinal axis and a second extending portion 8A2 that extends along the longitudinal axis and through which current flows in the opposite direction to the first extending portion 8A1. In the magnet 7A, the magnetic poles of the surface 7A11 facing the first extending portion 8A1 and the magnetic poles of the surface 7A21 facing the second extending portion 8A2 are different. With this configuration, the direction of the magnetic force generated by coil 8A changes alternately, which ensures that the magnet 7A reliably swings the fixed pendulum 5A.

[0057] In the vibration generator 3A, the center of gravity of the pendulum 5A is located closer to the tip 516 than the midpoint of the distance from the rotation axis Rx to the tip 516. This configuration allows for an increase in the rotational torque generated when the pendulum 5A swings. Consequently, the vibrations generated by the vibration generator 3A can be made larger.

[0058] In the vibration generating device 3A, the pendulum 5A has mounting sections 514 and 515 at positions spaced apart from the rotation axis Rx toward the tip section 516, where the weight section 52 can be positioned. With this configuration, the weight and center of gravity of the pendulum can be adjusted by adjusting the weight and placement of the weights in the arrangement section, thereby increasing the rotational torque generated when the pendulum swings. Consequently, the amplitude of the vibration generated by the vibration generator can be adjusted.

[0059] In the vibration generator 3A, the base 4A has a relief portion 45 that avoids contact with the pendulum 5A. With this configuration, it is possible to suppress the noise generated when the pendulum 5A comes into contact with the base 4A during its swing, and the stroke of the pendulum 5A during its swing can be increased.

[0060] [First modified example of the first embodiment] In the vibration generating device 3A described above, the magnet 7A includes a first magnetic member 7A1 and a second magnetic member 7A2 that are spaced apart from each other in the -Y direction from the first extending portion 8A1 to the second extending portion 8A2. However, the magnet provided on the pendulum 5A may consist of a single magnet facing the first extending portion 8A1 and the second extending portion 8A2.

[0061] Figure 12 is a cross-sectional view showing a first modified example of the drive unit 6A. More specifically, Figure 12 is a cross-sectional view showing magnet 7B, which is a modified version of magnet 7A in the drive unit 6A. For example, the drive unit 6A used in the vibration generator 3A may use the magnet 7B shown in Figure 12 instead of the magnet 7A. That is, at least one of the drive units, the first drive unit 61 and the second drive unit 62, may be equipped with the magnet 7B instead of the magnet 7A.

[0062] Unlike magnet 7A, which has a first magnetic member 7A1 and a second magnetic member 7A2, magnet 7B is composed of a single magnetic member. The magnet 7B is formed in the shape of a rectangular parallelepiped having a longitudinal axis substantially parallel to the longitudinal axis of the coil 8A, and is fixed to the plate member 91 so as to face the coil 8A without contact. The dimensions of the magnet 7B along its longitudinal axis are substantially the same as the dimensions of the coil 8A along its longitudinal axis, and the dimensions of the magnet 7B along the +Y direction perpendicular to the longitudinal axis are substantially the same as the dimensions of the coil 8A along the +Y direction. Magnet 7B has a portion 7B1 facing the first extension portion 8A1 of coil 8A and a portion 7B2 facing the second extension portion 8A2 of coil 8A, and portions 7B1 and 7B2 are connected. The magnetic poles of the surface of portion 7B1 facing the first extension portion 8A1 are different from the magnetic poles of the surface of portion 7B2 facing the second extension portion 8A2. For example, the magnetic pole of the surface of portion 7B1 facing the first extension portion 8A1 is the south pole, and the magnetic pole of the surface of portion 7B2 facing the second extension portion 8A2 is the north pole. The same effect as described above can also be achieved by a vibration generating device 3A equipped with a drive unit 6A that employs such a magnet 7B.

[0063] [Second modified example of the first embodiment] In the vibration generating device 3A described above, the drive unit 6A, which includes the first drive unit 61 and the second drive unit 62, is said to be equipped with a magnet 7A and a coil 8A. That is, the drive unit 6A is said to be equipped with a coil 8A composed of a single air-core coil. However, the drive unit is not limited to this and may be equipped with multiple coils.

[0064] Figure 13 shows a second modified example of the drive unit 6A, which is the drive unit 6C. More specifically, it shows the drive unit 6C viewed from the opposite side of the coil 8A relative to the magnet 7C. For example, the vibration generator 3A may have a drive unit 6C as shown in Figure 13 instead of the drive unit 6A. That is, at least one of the first drive unit 61 and the second drive unit 62 may have the configuration of the drive unit 6C shown below. The drive unit 6C has the same configuration and function as the drive unit 6A, except that it is equipped with magnet 7C and coil 8C instead of magnet 7A and coil 8A.

[0065] [Coil Configuration] First, let me explain coil 8C. Coil 8C generates a magnetic field when an alternating current is passed through it from a control unit (not shown). Coil 8C comprises a first coil 8C1 and a second coil 8C2 arranged in parallel with the first coil 8C1 along its longitudinal axis.

[0066] Each of the first coil 8C1 and the second coil 8C2 is an air-core coil constructed by winding a conductor in a planar manner in a track-like or oval shape, with the longitudinal axis in the same direction, when viewed from a position opposite each of the first coil 8C1 and the second coil 8C2. The dimensions of the first coil 8C1 along the longitudinal axis are larger than the dimensions of the first coil 8C1 along the +Y direction perpendicular to the longitudinal axis, and the dimensions of the second coil 8C2 along the longitudinal axis are larger than the dimensions of the second coil 8C2 along the +Y direction perpendicular to the longitudinal axis.

[0067] The first coil 8C1, like coil 8A, has a first extension portion 8C11 and a second extension portion 8C12 that extend along the longitudinal axis of the first coil 8C1. The first extension portion 8C11 is positioned in the +Y direction with respect to the air core portion SP1 of the first coil 8C1. The second extension portion 8C12 is positioned on the opposite side of the air core portion SP1 of the first coil 8C1 from the first extension portion 8C11. That is, the second extension portion 8C12 is positioned in the -Y direction with respect to the first extension portion 8C11. The dimensions of the second extension portion 8C12 along the longitudinal axis of the first coil 8C1 are approximately the same as the dimensions of the first extension portion 8C11 along the longitudinal axis of the first coil 8C1.

[0068] In this embodiment, the second coil 8C2 is a coil having the same configuration and dimensions as the first coil 8C1. That is, the second coil 8C2 has a first extension portion 8C21 similar to the first extension portion 8C11, and a second extension portion 8C22 similar to the second extension portion 8C12. Although the first coil 8C1 and the second coil 8C2 are air-core coils without a core as described above, they may also be coils with a core.

[0069] The control unit of the drive unit 6C is electrically connected to the operation control unit 26 of the vibration reduction device 2, similar to the control unit in the first embodiment. By energizing the coil 8C with alternating current supplied from the operation control unit 26, a magnetic force is generated, causing the pendulum 5A, which is equipped with a magnet 7C, to swing. Specifically, the control unit energizes the first coil 8C1 and the second coil 8C2 with alternating current such that the first extensions 8C11 and 8C21 have the same magnetic poles, and the second extensions 8C12 and 8C22 have the same magnetic poles.

[0070] [Magnet composition] The magnet 7C includes a first magnet 7C1 and a second magnet 7C2 arranged in parallel with the first magnet 7C1 along its longitudinal axis. The first magnet 7C1 is positioned opposite the first coil 8C1 in a non-contact manner, and the second magnet 7C2 is positioned opposite the second coil 8C2 in a non-contact manner. The first magnet 7C1, like magnet 7A, has a first magnetic member 7C11 and a second magnetic member 7C12. Each of the first magnetic member 7C11 and the second magnetic member 7C12 is formed in a substantially rectangular parallelepiped shape with a longitudinal axis substantially parallel to the longitudinal axis of the first magnet 7C1. The first magnet member 7C11 is positioned opposite the first extended portion 8C11 of the first coil 8C1. The second magnet member 7C12 is positioned spaced apart from the first magnet member 7C11 in the -Y direction and is positioned opposite the second extension portion 8C12 of the first coil 8C1. In the first magnet member 7C11, the magnetic pole of the surface facing the first extension 8C11 is different from the magnetic pole of the surface facing the second extension 8C12 in the second magnet member 7C12. For example, in the first magnet member 7C11, the magnetic pole of the surface facing the first extension 8C11 is the south pole, and in the second magnet member 7C12, the magnetic pole of the surface facing the second extension 8C12 is the north pole.

[0071] The second magnet 7C2, like the first magnet 7C1, has a first magnetic member 7C21 and a second magnetic member 7C22. Each of the first magnetic member 7C21 and the second magnetic member 7C22 is formed in a substantially rectangular parallelepiped shape with a longitudinal axis substantially parallel to the longitudinal axis of the second magnet 7C2. The first magnet member 7C21 is positioned opposite the first extended portion 8C21 of the second coil 8C2. The second magnet member 7C22 is positioned spaced apart from the first magnet member 7C21 in the -Y direction and is positioned opposite the second extension portion 8C22 of the second coil 8C2. In the first magnet member 7C21, the magnetic pole of the surface facing the first extension 8C21 is different from the magnetic pole of the surface facing the second extension 8C22 in the second magnet member 7C22. For example, in the first magnet member 7C21, the magnetic pole of the surface facing the first extension 8C21 is the south pole, and in the second magnet member 7C22, the magnetic pole of the surface facing the second extension 8C22 is the north pole.

[0072] In this second modified example, the magnetic poles on the surface of the first magnet member 7C11 facing the first extension portion 8C11 are the same as the magnetic poles on the surface of the first magnet member 7C21 facing the first extension portion 8C21. Similarly, the magnetic poles on the surface of the second magnet member 7C12 facing the second extension portion 8C12 are the same as the magnetic poles on the surface of the second magnet member 7C22 facing the second extension portion 8C22. Furthermore, the control unit energizes the first coil 8C1 and the second coil 8C2 with alternating currents of the same frequency and phase so that the first extension sections 8C11 and 8C21 have the same magnetic poles, and the second extension sections 8C12 and 8C22 have the same magnetic poles. This allows the pendulum 5A to swing around the rotation axis Rx while suppressing interference between the magnetic field generated by the first coil 8C1 and the magnetic field generated by the second coil 8C2.

[0073] Furthermore, in cases where, for example, the first coil 8C1 and the second coil 8C2 are sufficiently separated, the control unit may supply alternating current to the first coil 8C1 and the second coil 8C2 such that the first extended portions 8C11 and 8C21 have different magnetic poles and the second extended portions 8C12 and 8C22 have different magnetic poles. In this case, it is sufficient that the magnetic poles of the surface of the first magnet member 7C11 facing the first extension portion 8C11 are different from the magnetic poles of the surface of the first magnet member 7C21 facing the first extension portion 8C21, and that the magnetic poles of the surface of the second magnet member 7C12 facing the second extension portion 8C12 are different from the magnetic poles of the surface of the second magnet member 7C22 facing the second extension portion 8C22.

[0074] Figure 14 shows a magnet 7D that can be used in the drive unit 6C instead of magnet 7C. Alternatively, the drive unit 6C may use the magnet 7D shown in Figure 14 instead of the magnet 7C. Unlike the magnet 7C, which has a first magnet 7C1 and a second magnet 7C2, the magnet 7D has a first magnetic member 7D1 and a second magnetic member 7D2. The first magnet member 7D1 and the second magnet member 7D2 are formed in a substantially rectangular parallelepiped shape having a longitudinal axis along the direction in which the first coil 8C1 and the second coil 8C2 are aligned. The dimensions of the first magnet member 7D1 along the longitudinal axis and the dimensions of the second magnet member 7D2 along the longitudinal axis are substantially the same as the distance from the end of the first coil 8C1 opposite to the second coil 8C2 to the end of the second coil 8C2 opposite to the first coil 8C1.

[0075] The first magnet member 7D1 is positioned across the first extension portion 8C11 of the first coil 8C1 and the first extension portion 8C11 of the second coil 8C2, and the second magnet member 7D2 is positioned across the second extension portion 8C12 of the first coil 8C1 and the second extension portion 8C22 of the second coil 8C2. The magnetic poles of the faces of the first magnet member 7D1 facing the first extension portions 8C11 and 8C21 are different from the magnetic poles of the faces of the second magnet member 7D2 facing the second extension portions 8C12 and 8C22. For example, the magnetic poles of the faces of the first magnet member 7D1 facing the first extension portions 8C11 and 8C21 are south poles, and the magnetic poles of the faces of the second magnet member 7D2 facing the second extension portions 8C12 and 8C22 are north poles. A configuration similar to that of the drive unit 6C, which has such a magnet 7D in place of magnet 7C, may be adopted in at least one of the drive units, the first drive unit 61 and the second drive unit 62.

[0076] Figure 15 shows a magnet 7E that can be used in the drive unit 6C instead of magnet 7C. Alternatively, the drive unit 6C may use the magnet 7E shown in Figure 15 instead of the magnet 7C. Unlike the magnet 7C, which has a first magnet 7C1 and a second magnet 7C2, the magnet 7E has a first magnet 7E1 and a second magnet 7E2. The first magnet 7E1 is formed in a roughly rectangular parallelepiped shape with a longitudinal axis substantially parallel to the longitudinal axis of the first coil 8C1. The second magnet 7E2 is formed in a roughly rectangular parallelepiped shape with a longitudinal axis substantially parallel to the longitudinal axis of the second coil 8C2. The dimensions of the first magnet 7E1 along its longitudinal axis are substantially the same as the dimensions of the first coil 8C1 along its longitudinal axis, and the dimensions of the second magnet 7E2 along its longitudinal axis are substantially the same as the dimensions of the second coil 8C2 along its longitudinal axis. Furthermore, the dimensions of the first magnet 7E1 along the +Y direction perpendicular to the longitudinal axis are substantially the same as the dimensions of the first coil 8C1 along the +Y direction, and the dimensions of the second magnet 7E2 along the +Y direction are substantially the same as the dimensions of the second coil 8C2 along the +Y direction.

[0077] The first magnet 7E1 faces the first coil 8C1 in a non-contact manner. The first magnet 7E1 has a portion 7E11 that faces the first extension portion 8C11 of the first coil 8C1, and a portion 7E12 that faces the second extension portion 8C12 of the first coil 8C1. The magnetic poles of the surface of portion 7E11 facing the first extension portion 8C11 are different from the magnetic poles of the surface of portion 7E12 facing the second extension portion 8C12. For example, the magnetic pole of the surface of portion 7E11 facing the first extension portion 8C11 is the south pole, and the magnetic pole of the surface of portion 7E12 facing the second extension portion 8C12 is the north pole.

[0078] The second magnet 7E2 faces the second coil 8C2 in a non-contact manner. The second magnet 7E2 has a portion 7E21 that faces the first extension portion 8C21 of the second coil 8C2, and a portion 7E22 that faces the second extension portion 8C22 of the second coil 8C2. The magnetic poles of the surface of portion 7E21 facing the first extension portion 8C21 are different from the magnetic poles of the surface of portion 7E22 facing the second extension portion 8C22. For example, the magnetic pole of the surface of portion 7E21 facing the first extension portion 8C21 is the south pole, and the magnetic pole of the surface of portion 7E22 facing the second extension portion 8C22 is the north pole. A configuration similar to that of the drive unit 6C, which has such a magnet 7E in place of the magnet 7C, may be adopted in at least one of the drive units, the first drive unit 61 and the second drive unit 62.

[0079] As described above, depending on the direction of the current flowing through the first coil 8C1 and the second coil 8C2, the magnetic poles of the surface facing the first extension 8C11 in section 7E11 may be different from those of the surface facing the first extension 8C21 in section 7E21, and the magnetic poles of the surface facing the second extension 8C12 in section 7E12 may be different from those of the surface facing the second extension 8C22 in section 7E22.

[0080] Figure 16 shows a magnet 7F that can be used in the drive unit 6C instead of magnet 7C. Alternatively, the drive unit 6C may use a magnet 7F, as shown in Figure 16, instead of magnet 7C. Unlike magnet 7C, which has a first magnet 7C1 and a second magnet 7C2, magnet 7F is a single magnetic component. Magnet 7F is formed in a substantially rectangular parallelepiped shape with a longitudinal axis aligned in the direction in which the first coil 8C1 and the second coil 8C2 are aligned. The dimensions of magnet 7F along the longitudinal axis are approximately the same as the distance from the end of the first coil 8C1 opposite to the second coil 8C2 to the end of the second coil 8C2 opposite to the first coil 8C1, and the dimensions of magnet 7F along the +Y direction perpendicular to the longitudinal axis are approximately the same as the dimensions of the first coil 8C1 and the second coil 8C2 along the +Y direction.

[0081] The magnet 7F has a portion 7F1 that faces the first extension portion 8C11 of the first coil 8C1 and the first extension portion 8C21 of the second coil 8C2, respectively, and a portion 7F2 that faces the second extension portion 8C12 of the first coil 8C1 and the second extension portion 8C22 of the second coil 8C2, respectively. The magnetic poles of the surface of portion 7F1 facing the first extension portions 8C11 and 8C21 are different from the magnetic poles of the surface of portion 7F2 facing the second extension portions 8C12 and 8C22. For example, the magnetic pole of the surface of portion 7F1 facing the first extension portions 8C11 and 8C21 is the south pole, and the magnetic pole of the surface of portion 7F2 facing the second extension portions 8C12 and 8C22 is the north pole. A configuration similar to that of the drive unit 6C, which has such a magnet 7F in place of the magnet 7C, may be adopted in at least one of the drive units, the first drive unit 61 and the second drive unit 62.

[0082] [Third modified example of the first embodiment] In the vibration generating device 3A described above, the pendulum 5A is supported so as to be able to swing around the rotation axis Rx by a pair of support parts 41 provided at the -Z end of the base 4A. In other words, the pair of support parts 41 that support the pendulum 5A so as to be able to swing around the rotation axis Rx are provided at the -Z end of the base 4A. However, the position of the pair of support parts 41 may be provided at a position in the +Z direction rather than at the -Z end of the base 4A.

[0083] Figure 17 is a plan view showing a third modified example of the vibration generator 3A. More specifically, Figure 17 is a plan view showing the base 4G and pendulum 5G, which are variations of the base 4A and pendulum 5A of the vibration generator 3A. For example, instead of the base 4A and pendulum 5A in the vibration generator 3A, the base 4G and pendulum 5G shown in Figure 17 may be used. The base 4G differs from the base 4A in the position of the pair of support parts 41, and the pendulum 5G differs from the pendulum 5A in the dimension between the connecting part 511 and the enlarged part 513. Specifically, in the base 4G, the pair of support portions 41 are positioned in the +Z direction rather than at the -Z end of the base 4G. That is, the pair of support portions 41 are located in the base 4G between the -Z end and the relief portion 45. Furthermore, depending on the position of the pair of support parts 41 in the base 4G, the dimension between the connecting part 511 and the expanded part 513 in the pendulum 5G is smaller than the dimension between the connecting part 511 and the expanded part 513 in the pendulum 5A. That is, the pendulum 5G does not have an extension part 512 connecting from the connecting part 511 to the expanded part 513, and is composed of the expanded part 513 and a part connected to the expanded part 513 that is supported by the pair of support parts 41. The end of the expanded part 513 in the -Z direction is adjacent to the pair of support parts 41. A vibration generator 3A employing such a base 4G and pendulum 5G can achieve the same effects as described above, and the vibration generator 3A can be made more compact.

[0084] [Fourth modified example of the first embodiment] The vibration generator 3A described above includes a drive unit 6A comprising a first drive unit 61 and a second drive unit 62. However, the vibration generator 3A is not limited to this configuration and may be configured to include only one of the drive units, the first drive unit 61 or the second drive unit 62. For example, the vibration generator 3A may be equipped with only the first drive unit 61, or with only the second drive unit 62.

[0085] [Second Embodiment] Next, a second embodiment of this disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but differs from the projector 1 according to the first embodiment in that the vibration generating device further includes a tip-side drive unit. In the following description, parts that are the same or substantially the same as parts already described are denoted by the same reference numerals and their description is omitted.

[0086] Figure 18 is a plan view of the vibration generator 3H, which is part of the vibration reduction device for the projector according to this embodiment, as seen from the +Y direction. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it is equipped with a vibration generator 3H shown in Figure 18 instead of vibration generator 3A. That is, the vibration reduction device according to this embodiment has the same configuration and functions as the vibration reduction device 2 according to the first embodiment, except that it is equipped with a vibration generator 3H instead of vibration generator 3A. The vibration generator 3H has the same configuration and functions as the vibration generator 3A according to the first embodiment, except that it further comprises a tip-side drive unit 63. That is, the vibration generator 3H comprises a base 4A, a pendulum 5A, and a plurality of drive units 6A, the plurality of drive units 6A including a first drive unit 61, a second drive unit 62, and a tip-side drive unit 63.

[0087] [Configuration of the front-end drive unit] The tip-side drive unit 63 is provided in the +Z direction relative to the pendulum 5A and, together with the first drive unit 61 and the second drive unit 62, swings the pendulum 5A around the rotation axis Rx. That is, the tip-side drive unit 63 is provided in a different position from the first drive unit 61 and the second drive unit 62. The tip-side drive unit 63 includes a magnet 7A, a coil 8A, a plate member 91, a holding member 92, and a terminal portion 93, similar to the first drive unit 61 and the second drive unit 62, as well as a control unit (not shown). In the front-end drive unit 63, the plate member 91 is attached to a mounting portion 5161 provided on the tip portion 516 of the arm 51. The first magnetic member 7A1 and the second magnetic member 7A2, which constitute the magnet 7A, are fixed to the +Z direction surface of the plate member 91 such that the longitudinal axes of each magnetic member 7A1 and 7A2 are aligned in the +X direction. That is, the magnet 7A of the tip-side drive unit 63 is provided at the tip portion 516, spaced apart from the rotation axis Rx. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 42 of the base 4A. The coil 8A is attached to the second plate-shaped portion 922 of the holding member 92 on the -Z direction surface facing the magnet 7A, so as to face the magnet 7A without contact. More specifically, the coil 8A is arranged such that the first extending portion 8A1 faces the first magnet member 7A1 without contact in the +Z direction, and the second extending portion 8A2 faces the second magnet member 7A2 without contact in the +Z direction. As described above, the magnetic poles on the surface of the first magnetic member 7A1 facing the first extended portion 8A1 are different from the magnetic poles on the surface of the second magnetic member 7A2 facing the second extended portion 8A2.

[0088] [Synchronization of the first drive unit, the second drive unit, and the tip-side drive unit] The control unit of the tip-side drive unit 63 generates a magnetic field in the coil 8A by passing an alternating current through the coil 8A of the tip-side drive unit 63. At this time, the control units of each drive unit 61 to 63 pass an alternating current of the same frequency and phase through each coil 8A such that the first extension portion 8A1 of each coil 8A has the same magnetic pole and the second extension portion 8A2 of each coil 8A has the same magnetic pole. This makes it possible to prevent the swinging of the pendulum 5A by the other drive units from being hindered by at least one of the drive units, the first drive unit 61, the second drive unit 62, and the tip-side drive unit 63. In addition, since the pendulum 5A can be swung by the driving force of each drive unit 61 to 63, the rotational torque during the swing of the pendulum 5A can be increased. Furthermore, depending on the magnetic poles of the surface 7A11 of the first magnet member 7A1 facing the first extension portion 8A1 in each drive unit 61 to 63, and the magnetic poles of the surface 7A21 of the second magnet member 7A2 facing the second extension portion 8A2, the alternating current supplied to each coil 8A does not necessarily have to be in the same phase. Also, multiple drive units 61 to 63 may share a single control unit.

[0089] [Effects of the second embodiment] The projector according to this embodiment described above provides the same effects as the projector 1 according to the first embodiment, as well as the following effects. The vibration generator 3H includes a tip-side drive unit 63 which is included in at least one drive unit 6A. Specifically, the vibration generator 3H includes a first drive unit 61 and a second drive unit 62, in addition to the tip-side drive unit 63. The tip-side drive unit 63 has a magnet 7A as a tip-side magnet and a coil 8A as a tip-side coil. The magnet 7A is provided at the tip 516 of the pendulum 5A, and the coil 8A is positioned opposite the magnet 7A without contact. With this configuration, the pendulum 5A can be swung by multiple drive units 61-63, thereby increasing the swing of the pendulum 5A and increasing the torque during the swing of the pendulum 5A. Consequently, the vibration generated by the vibration generator 3H can be increased.

[0090] [Variation of the second embodiment] The vibration generating device 3H described above comprises a first drive unit 61, a second drive unit 62, and a tip-side drive unit 63. However, it is not limited to this configuration, and the vibration generating device 3H may also comprise one of the first drive unit 61 and the second drive unit 62, and the tip-side drive unit 63. For example, the vibration generating device 3H may comprise only the tip-side drive unit 63, or only one of the first drive unit 61 and the second drive unit 62. In the vibration generating device 3H, each drive unit 61 to 63 is equipped with a magnet 7A having a first magnetic member 7A1 and a second magnetic member 7A2. However, this is not limited to this, and at least one of the drive units 61 to 63 may be equipped with the above-mentioned magnet 7B instead of magnet 7A.

[0091] The vibration generating device 3H is described as having a coil 8A in each of the drive units 61 to 63. However, it is not limited to this, and at least one of the drive units 61 to 63 may have a coil 8C having a first coil 8C1 and a second coil 8C2 instead of coil 8A. In this case, the magnet positioned opposite the coil 8C in a non-contact manner may be one of the magnets 7C, 7D, 7E, and 7F. The vibration generator 3H is said to include a base 4A and a pendulum 5A. However, it is not limited to this configuration, and the vibration generator 3H may also include a base 4G and a pendulum 5G instead of the base 4A and pendulum 5A.

[0092] [Third Embodiment] Next, a third embodiment of this disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but differs in that the vibration generating device includes a drive unit that is positioned on the opposite side of the pendulum's rotation axis from the first and second drive units. In the following description, parts that are the same or substantially the same as those already described are denoted by the same reference numerals and their description is omitted.

[0093] Figure 19 is a plan view of the vibration generator 3J of the vibration reduction device included in the projector according to this embodiment, as seen from the +Y direction. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it is equipped with a vibration generator 3J shown in Figure 19 instead of vibration generator 3A. That is, the vibration reduction device according to this embodiment has the same configuration and functions as the vibration reduction device 2 according to the first embodiment, except that it is equipped with a vibration generator 3J instead of vibration generator 3A. The vibration generator 3J has the same configuration and functions as the vibration generator 3A according to the first embodiment, except that it includes a base 4J and a pendulum 5J instead of the base 4A and pendulum 5A, and further includes a third drive unit 64 and a fourth drive unit 65. That is, the vibration generator 3J includes a base 4J, a pendulum 5J, and a plurality of drive units 6A, and the plurality of drive units 6A include a first drive unit 61, a second drive unit 62, a third drive unit 64 and a fourth drive unit 65.

[0094] [Base configuration] The base 4J supports the pendulum 5J so that it can swing around the rotation axis Rx. The holding members 92 of each drive unit 61, 62, 64, and 65 are fixed to the base 4J. Base 4J has the same configuration and function as base 4A, except that it has fixing parts 46, 47, 48 and relief parts 49. That is, base 4J has a pair of support parts 41, fixing parts 42-44, 46-48 and relief parts 45, 49. In the base 4J, the pair of support parts 41 are positioned in the center of the base 4J in the +Z direction, and the pendulum 5J is sandwiched between them along the +X direction.

[0095] The fixing parts 46 to 48 are located on the opposite side from the fixing parts 42 to 44, with the pair of support parts 41 in between. That is, the fixing parts 46 to 48 are located in the -Z direction relative to the pair of support parts 41. Of the fixing parts 46 to 48, fixing part 47, located in the +X direction, is the part to which the holding member 92 of the third drive unit 64 is fixed, and fixing part 48, located in the -X direction, is the part to which the holding member 92 of the fourth drive unit 65 is fixed. Fixing part 46, located in the -Z direction, is a part to which the holding members 92 of other drive units can be fixed. Specifically, the fixing portion 47 is the portion of the pair of support portions 41 that extends from the end in the +X direction along the rotation axis Rx in the -Z direction, which is the direction in which the second arm 5J4 extends from the rotation axis Rx. The fixing portion 48 is the portion of the pair of support portions 41 that extends from the end in the -X direction along the rotation axis Rx in the -Z direction, which is the direction in which the second arm 5J4 extends from the rotation axis Rx. The fixing portion 46 is the portion of the fixing portions 47 and 48 that connects the ends opposite to the pair of support portions 41.

[0096] The relief portion 49 is a part that prevents the end of the pendulum 5J in the -Z direction from contacting the base 4J when the pendulum 5J swings. In this embodiment, the relief portion 49 is an opening that penetrates the base 4J along the +Y direction, similar to the relief portion 45. However, it is not limited to this, and the relief portion 49 may be a recess that opens in the +Y direction or the -Y direction.

[0097] [Pendulum Structure] The pendulum 5J is supported on the base 4J so as to be able to swing about a rotation axis Rx along the +X direction. The pendulum 5J comprises an arm 5J1 and a weight 5J5. Arm 5J1 is pivotably supported on base 4J. Arm 5J1 comprises a connecting portion 5J2, a first arm 5J3, and a second arm 5J4. The weight portion 5J5 includes a first weight portion 5J6 of the first arm 5J3 and a second weight portion 5J7 of the second arm 5J4.

[0098] The connecting part 5J2 is located at the center of the pendulum 5J in the +Z direction perpendicular to the rotation axis Rx, and connects the first arm 5J3 and the second arm 5J4. The connecting part 5J2 has the same configuration as the connecting part 511 and is supported by a pair of support parts 41 so as to be able to swing about the rotation axis Rx. As a result, the pendulum 5J is supported on the base 4J so as to be able to swing about the rotation axis Rx.

[0099] The first arm 5J3 extends in the +Z direction from the connecting portion 5J2. Similar to the pendulum 5A, the first arm 5J3 has an enlarged portion 513, arrangement portions 514, 515 (not shown in Figure 19), a tip portion 516, a first side portion 517, and a second side portion 518. In the enlarged portion 513 of the first arm 5J3, the plate member 91 and magnet 7A of the first drive unit 61 are attached to the first side portion 517 facing the +X direction. In the enlarged portion 513 of the first arm 5J3, the plate member 91 and magnet 7A of the second drive unit 62 are attached to the second side portion 518 facing the -X direction. The first weight portion 5J6 is composed of at least one weight member 53 fixed to at least one of the arrangement portions 514 and 515 of the first arm 5J3.

[0100] The second arm 5J4 extends from the connecting portion 5J2 in the -Z direction. That is, the second arm 5J4 extends from the rotation axis Rx in the opposite direction to the direction in which the first arm 5J3 extends from the rotation axis Rx. The second arm 5J4 has a structure that is symmetrical with respect to the rotation axis Rx with respect to the first arm 5J3. Specifically, the second arm 5J4 has an enlarged portion 513, arrangement portions 514, 515 (not shown in Figure 19), a tip portion 516, a first side portion 517, and a second side portion 518. In the enlarged portion 513 of the second arm 5J4, the plate member 91 and magnet 7A of the third drive unit 64 are attached to the first side portion 517 facing the +X direction. In the enlarged portion 513 of the second arm 5J4, the plate member 91 and magnet 7A of the fourth drive unit 65 are attached to the second side portion 518 facing the -X direction. The second weight portion 5J7 is composed of at least one weight member 53 fixed to at least one of the arrangement portions 514 and 515 of the second arm 5J4.

[0101] [Configuration and arrangement of the drive unit] The third drive unit 64 and the fourth drive unit 65 correspond to the second arm side drive unit. The third drive unit 64 and the fourth drive unit 65 apply a driving force to the second arm 5J4 to swing the pendulum 5J. As described above, the third drive unit 64 and the fourth drive unit 65 are included in a plurality of drive units 6A. That is, each drive unit 61, 62, 64, and 65 includes a magnet 7A, a coil 8A, a plate member 91, a holding member 92, and a terminal part 93, as well as a control unit (not shown).

[0102] The first drive unit 61 and the second drive unit 62 of the vibration generating device 3J correspond to the first arm-side drive unit. In the first drive unit 61 of the vibration generator 3J, the plate member 91 is attached to the first side portion 517 of the first arm 5J3. The first magnet member 7A1 and the second magnet member 7A2, which constitute the magnet 7A, are fixed to the +X direction surface of the plate member 91 so that their longitudinal axes are aligned in the +Z direction. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 43 of the base 4J. The coil 8A is attached to the -X direction surface of the second plate-shaped portion 922 of the holding member 92 so as to face the magnet 7A without contact. In the first drive unit 61 as well, the magnetic poles of the surface of the first magnet member 7A1 facing the first extension portion 8A1 are different from the magnetic poles of the surface of the second magnet member 7A2 facing the second extension portion 8A2.

[0103] In the second drive unit 62 of the vibration generator 3J, the plate member 91 is attached to the second side portion 518 of the first arm 5J3. The first magnet member 7A1 and the second magnet member 7A2, which constitute the magnet 7A, are fixed to the -X direction surface of the plate member 91 such that their longitudinal axes are aligned along the +Z direction. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 44 of the base 4J. The coil 8A is attached to the +X direction surface of the second plate-shaped portion 922 of the holding member 92 so as to face the magnet 7A without contact. In the second drive unit 62 as well, the magnetic poles of the surface of the first magnet member 7A1 facing the first extension portion 8A1 are different from the magnetic poles of the surface of the second magnet member 7A2 facing the second extension portion 8A2.

[0104] In the third drive unit 64 of the vibration generator 3J, the plate member 91 is attached to the first side portion 517 of the second arm 5J4. The first magnet member 7A1 and the second magnet member 7A2, which constitute the magnet 7A, are fixed to the +X direction surface of the plate member 91 such that their longitudinal axes are aligned along the +Z direction. That is, the magnet 7A is the second arm side magnet and is provided in the second arm 5J4 at a position spaced apart from the rotation axis Rx. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 47 of the base 4J. The coil 8A is attached to the -X direction surface of the second plate-shaped portion 922 of the holding member 92, facing the magnet 7A, so as to face the magnet 7A without contact. That is, the coil 8A is the second arm side coil and is positioned to face the magnet 7A without contact. In the third drive unit 64, the magnetic poles of the first magnet member 7A1 facing the first extension portion 8A1 are different from the magnetic poles of the second magnet member 7A2 facing the second extension portion 8A2.

[0105] In the fourth drive unit 65 of the vibration generator 3J, the plate member 91 is attached to the second side portion 518 of the second arm 5J4. The first magnet member 7A1 and the second magnet member 7A2, which constitute the magnet 7A, are fixed to the -X direction surface of the plate member 91 such that their longitudinal axes are aligned along the +Z direction. That is, the magnet 7A is the second arm side magnet and is provided in the second arm 5J4 at a position spaced apart from the rotation axis Rx. The first plate-shaped portion 921 of the holding member 92 is fixed to the fixing portion 48 of the base 4J. The coil 8A is attached to the +X direction surface of the second plate-shaped portion 922 of the holding member 92 that faces the magnet 7A without contact. That is, the coil 8A is the second arm side coil and is positioned to face the magnet 7A without contact. In the fourth drive unit 65, the magnetic poles of the first magnet member 7A1 facing the first extension portion 8A1 are different from the magnetic poles of the second magnet member 7A2 facing the second extension portion 8A2. Thus, in this embodiment, the magnetic poles of the first magnetic member 7A1 of each magnet 7A facing the first extension portion 8A1 are the same in the drive units 61, 62, 64, and 65, and the magnetic poles of the second magnetic member 7A2 of each magnet 7A facing the second extension portion 8A2 are the same in the drive units 61, 62, 64, and 65.

[0106] [Configuration of the control unit] The control units of each drive unit 61, 62, 64, and 65 generate a magnetic field in each coil 8A by supplying alternating current to the corresponding coil 8A. At this time, each control unit supplies alternating current of the same frequency to each coil 8A such that the first extension portion 8A1 of each coil 8A in drive units 61 and 62, which are positioned in the +Z direction from the rotation axis Rx, has the same magnetic pole, and the first extension portion 8A1 of each coil 8A in drive units 64 and 65, which are positioned in the -Z direction from the rotation axis Rx, has the same magnetic pole. At this time, each control unit supplies alternating current to each coil 8A in drive units 64 and 65, which is shifted by half a period in phase with respect to the alternating current supplied to each coil 8A in drive units 61 and 62, such that the magnetic poles of the first extension portion 8A1 of each coil 8A in drive units 61 and 62 are different from those of the first extension portion 8A1 of each coil 8A in drive units 64 and 65. In other words, each control unit energizes each coil 8A with an alternating current of the same frequency such that the direction of the magnetic field generated in the coils 8A of the drive units 61 and 62 is opposite to the direction of the magnetic field generated in the drive units 64 and 65.

[0107] This prevents at least one of the drive units 61, 62, 64, and 65 from hindering the swinging of the pendulum 5J by the other drive units. In addition, since the pendulum 5J can be swung by the driving force of each drive unit 61, 62, 64, and 65, the rotational torque during the swing of the pendulum 5J can be increased. Note that the drive units 61, 62, 64, and 65 may share a control unit. By positioning the weight members 53, which are placed in the arrangement sections 514, 515 of the first arm 5J3 and the arrangement sections 514, 515 of the second arm 5J4, at a position away from the rotation axis Rx of the pendulum 5J, the driving force of the pendulum 5J can be increased. Furthermore, by arranging the positions of the weight members 53, which are placed in the arrangement sections 514, 515 of the first arm 5J3 and the positions of the weight members 53, which are placed in the arrangement sections 514, 515 of the second arm 5J4, symmetrically with respect to the rotation axis Rx, the center of gravity of the pendulum 5J can be positioned on the rotation axis Rx, thereby enabling the pendulum 5J to swing stably. Moreover, the arrangement of the weight members 53 is not limited to symmetrical placement; the position or number of weight members 53 may be different between the first arm 5J3 and the second arm 5J4, thereby shifting the center of gravity of the pendulum 5J away from the rotation axis Rx.

[0108] [Effects of the third embodiment] The projector according to this embodiment described above provides the same effects as the projector 1 according to the first embodiment, as well as the following effects. In the vibration generating device 3J, the pendulum 5J has a first arm 5J3 and a second arm 5J4. The first arm 5J3 extends in the +Z direction intersecting the rotation axis Rx and has a tip portion 516, a first side portion 517, and a second side portion 518. The +Z direction corresponds to the first direction. The second arm 5J4 extends in the -Z direction from the rotation axis Rx. In this embodiment, the second arm 5J4 has a tip portion 516, a first side portion 517, and a second side portion 518. The vibration generator 3J comprises a plurality of drive units 6A, including a third drive unit 64 and a fourth drive unit 65. The third drive unit 64 has a magnet 7A as a second arm-side magnet and a coil 8A as a second arm-side coil. In the third drive unit 64, the magnet 7A is provided on the second arm 5J4 at a position spaced apart from the rotation axis Rx, and the coil 8A is positioned opposite the second arm-side magnet without contact. The fourth drive unit 65 also has a magnet 7A as a second arm-side magnet and a coil 8A as a second arm-side coil. The magnet 7A of the first drive unit 61 is provided on the first side surface 517 of the first arm 5J3 by a plate member 91, and the magnet 7A of the second drive unit 62 is provided on the second side surface 518 of the first arm 5J3 by a plate member 91.

[0109] With this configuration, the pendulum 5J having a first arm 5J3 and a second arm 5J4 can be made to swing like a seesaw. At this time, the vibration generating device 3J can apply a driving force to swing the pendulum 5J to each of the first arm 5J3 and the second arm 5J4 by means of a first drive unit 61 and a second drive unit 62 having a magnet 7A provided on the first arm 5J3, and a third drive unit 64 and a fourth drive unit 65 having a magnet 7A provided on the second arm 5J4. Therefore, the pendulum 5J can be made to swing stably.

[0110] [Variation of the third embodiment] In the vibration generating device 3J described above, each of the drive units 61, 62, 64, and 65 is equipped with a magnet 7A having a first magnetic member 7A1 and a second magnetic member 7A2. However, the device is not limited to this, and at least one of the drive units 61, 62, 64, and 65 may be equipped with the magnet 7B described above instead of magnet 7A. In the vibration generating device 3J, each of the drive units 61, 62, 64, and 65 is equipped with a coil 8A. However, this is not limited to this, and at least one of the drive units 61, 62, 64, and 65 may be equipped with a coil 8C having a first coil 8C1 and a second coil 8C2 instead of coil 8A. In this case, the magnet positioned opposite the coil 8C in a non-contact manner may be any one of the magnets 7C, 7D, 7E, and 7F. The vibration generator 3J is provided with drive units 61, 62, 64, and 65. However, it is not limited to this configuration, and the vibration generator 3J may be configured to omit at least one of the drive units 61, 62, 64, and 65. For example, the vibration generator 3J may be configured to include at least one of the drive units 61 and 62, and at least one of the drive units 64 and 65. Furthermore, the vibration generator 3J may include other drive units in place of or in addition to the drive units 64 and 65. Examples of such other drive units include at least one drive unit from among the tip-side drive unit 63, a magnet positioned at the tip 516 of the second arm 5J4, and a drive unit having a coil fixed to the fixing part 46.

[0111] [Fourth Embodiment] Next, a fourth embodiment of this disclosure will be described. The projector according to this embodiment has the same configuration as the projector 1 according to the first embodiment, but differs in that the pendulum constituting the vibration generating device can swing by the twisting of a plate material fixed to the base. In the following description, parts that are the same or substantially the same as those already described are denoted by the same reference numerals and their description is omitted.

[0112] Figure 20 is a plan view of the vibration generator 3K of the vibration reduction device included in the projector according to this embodiment, as seen from the +Y direction. The projector according to this embodiment has the same configuration and functions as the projector 1 according to the first embodiment, except that it is equipped with a vibration generator 3K shown in Figure 20 instead of vibration generator 3A. That is, the vibration reduction device according to this embodiment has the same configuration and functions as the vibration reduction device 2 according to the first embodiment, except that it is equipped with a vibration generator 3K instead of vibration generator 3A. The vibration generator 3K has the same configuration and functions as the vibration generator 3J according to the third embodiment, except that it includes a base 4K and a pendulum 5K instead of the base 4J and pendulum 5J. That is, the vibration generator 3K includes a base 4K, a pendulum 5K, and a plurality of drive units 6A, the plurality of drive units 6A including a first drive unit 61, a second drive unit 62, a third drive unit 64, and a fourth drive unit 65.

[0113] [Base configuration] Base 4K is a plate-shaped member that supports the pendulum 5K so that it can swing, and to which the holding members 92 of each drive unit 61, 62, 64, and 65 are fixed. Base 4K has the same configuration and function as base 4J, except that it has a pair of fixing parts 4K1 instead of a pair of support parts 41. A pair of fixing parts 4K1 are positioned in the center of the base 4K in the +Z direction, flanking the pendulum 5K. A pair of mounting parts 5K12, which are part of the plate material 5K1 that constitutes the pendulum 5K, are fixed to the pair of fixing parts 4K1.

[0114] [Pendulum Structure] The pendulum 5K, like the pendulum 5J, is mounted on the base 4J so as to be able to swing around the rotation axis Rx. The pendulum 5K has the same configuration as the pendulum 5J, except that it further includes a plate 5K1. That is, the pendulum 5K comprises an arm 5J1, a weight 5J5, and a plate 5K1. The plate 5K1 is fixed to the base 4K along the +X direction, forming the rotation axis Rx of the pendulum 5K. The plate 5K1 has a fixing portion 5K11, a pair of mounting portions 5K12, and a pair of twisting portions 5K13. The fixing portion 5K11 is the part of the plate material 5K1 that is fixed to the connection portion 5J2 of the arm 5J1. The fixing portion 5K11 is located in the center of the plate material 5K1 in the +X direction and is fixed to the +Y direction surface of the connection portion 5J2 by ​​a screw S2. The pair of mounting portions 5K12 are positioned to sandwich the fixing portion 5K11 in the +X direction. Each of the pair of mounting portions 5K12 is fixed to the corresponding fixing portion 4K1 of the pair of fixing portions 4K1 by a screw S3.

[0115] A pair of twisted portions 5K13 are positioned between the fixed portion 5K11 and the pair of mounting portions 5K12. Specifically, one of the pair of twisted portions 5K13 is provided between the fixed portion 5K11 and the mounting portion 5K12 in the +X direction, and the other twisted portion 5K13 is provided between the fixed portion 5K11 and the mounting portion 5K12 in the -X direction. Each of the pair of twisted portions 5K13 extends linearly along the +X direction. The pair of twisted sections 5K13 twist around an axis along the +X direction when the pendulum 5K is swung by the respective drive units 61, 62, 64, and 65, thereby enabling the pendulum 5K to swing. In other words, the extension of the axis connecting the pair of twisted sections 5K13 is the rotation axis Rx of the pendulum 5K.

[0116] [Effects of the fourth embodiment] The projector according to this embodiment, as described above, provides the same effects as the projector according to the third embodiment, as well as the following effects. In the vibration generating device 3K, the pendulum 5K is fixed to the base 4K and includes a plate material 5K1 that constitutes the rotation axis Rx. With this configuration, the arm 5J1 of the pendulum 5K can be attached to the base 4K in a simple manner so that it can swing. Therefore, the configuration of the vibration generator 3K can be simplified. In addition, since the arm 5J1 can be removed from the base 4K by removing the plate material 5K1, the arm 5J1 can be easily replaced.

[0117] [Variation of the fourth embodiment] In the vibration generating device 3K described above, the plate material 5K1 is assumed to have a pair of twisted portions 5K13 along the +X direction. That is, each of the pair of twisted portions 5K13 is assumed to extend linearly along the +X direction. However, the pair of twisted portions 5K13 are not limited to this and may have other shapes.

[0118] Figure 21 is a plan view showing the deformation of the vibration generator 3K. More specifically, Figure 21 is a plan view showing the deformation of plate material 5K2, which is plate material 5K1 of the vibration generator 3K. For example, the vibration generator 3K may use the plate material 5K2 shown in Figure 21 instead of the plate material 5K1. The plate material 5K2, like the plate material 5K1, is fixed to a pair of fixing parts 4K1 of the base 4K, forming the rotation axis Rx of the pendulum 5K. The plate material 5K2 has the same configuration and function as the plate material 5K1, except that it has a pair of twisted parts 5K23 instead of a pair of twisted parts 5K13. That is, the plate material 5K2 has a fixing part 5K11, a pair of mounting parts 5K12, and a pair of twisted parts 5K23.

[0119] The pair of twisted sections 5K23, like the pair of twisted sections 5K13, are positioned between the fixed section 5K11 and the pair of mounting sections 5K12. The pair of twisted sections 5K23 enable the swing of the pendulum 5K by twisting about an axis along the +X direction when the arm 5J1 of the pendulum 5K is swung by each of the drive units 61, 62, 64, and 65. In other words, the extension of the axis connecting the pair of twisted sections 5K23 is the rotation axis Rx of the pendulum 5K. Each of the pair of twisted sections 5K23 is formed in a roughly U-shape, opening in the +Z direction when viewed from the +Y direction. By forming the pair of twisted sections 5K23 in this shape, the strength of the pair of twisted sections 5K23 can be increased.

[0120] [Other variations of the fourth embodiment] The vibration generator 3K described above is assumed to include drive units 61, 62, 64, and 65. However, it is not limited to this configuration, and the vibration generator 3K may be configured to omit at least one of the drive units 61, 62, 64, and 65. In other words, the vibration generator 3K may be configured to include at least one of the drive units 61, 62, 64, and 65. For example, the vibration generator 3J may be configured to include at least one of the drive units 61 and 62, and at least one of the drive units 64 and 65. Furthermore, the vibration generator 3K may include other drive units in place of or in addition to the drive units 64 and 65. Examples of such other drive units include at least one drive unit from among the tip-side drive unit 63, a magnet positioned at the tip 516 of the second arm 5J4, and a drive unit having a coil fixed to the fixing part 46. Furthermore, the vibration generator 3K is said to include drive units 61, 62, 64, and 65, which are included in the plurality of drive units 6A. However, the vibration generator 3K is not limited to this, and may also include a drive unit 6C. If a drive unit 6C is used, the magnet and coil of the drive unit 6C may be any of the magnets and coils described above.

[0121] [Variations of the Embodiment] This disclosure is not limited to the embodiments described above and variations thereof, but includes any modifications and improvements that can achieve the objectives of this disclosure. In the first to third embodiments and variations thereof described above, the pendulums 5A, 5G, and 5J of the vibration generating devices 3A, 3H, and 3J are swingably supported by a pair of support parts 41 provided on the bases 4A, 4G, and 4J. However, the invention is not limited to this, and the pendulums 5A, 5G, and 5J of the vibration generating devices 3A, 3H, and 3J may also be swingably supported on the base by plate members 5K1 and 5K2 around the rotation axis Rx. In the fourth embodiment and its variation, the pendulums 5J and 5K of the vibration generator 3K are supported on the base 4K so as to be swingable by plate members 5K1 and 5K2. However, the invention is not limited to this, and the pendulum 5J may be supported on the base 4K so as to be swingable by a pair of support parts similar to the support parts 41.

[0122] In the embodiments described above, the first side portion 517 and the second side portion 518 of the pendulums 5A, 5G, and 5J were assumed to intersect with respect to the rotation axis Rx. More specifically, each side portion 517 and 518 was assumed to be parallel to a plane perpendicular to the direction parallel to the rotation axis Rx. However, the embodiments are not limited to this, and at least one of the first side portion 517 and the second side portion 518 may be inclined with respect to a plane perpendicular to the direction parallel to the rotation axis Rx. That is, intersecting with respect to the direction parallel to the rotation axis includes being parallel to a plane perpendicular to the direction parallel to the rotation axis, and being inclined with respect to a plane perpendicular to the direction parallel to the rotation axis.

[0123] In the embodiments described above, the coils 8A and 8C are fixed to the bases 4A, 4G, 4J, and 4K by the retaining member 92. However, the coils 8A and 8C are not limited to this configuration and may be fixed to a configuration other than the bases 4A, 4G, 4J, and 4K, for example, to the frame 23. Furthermore, the retaining member 92 does not have to function as a yoke for the coil 8A. Similarly, the plate member 91 does not have to function as a yoke for the magnets 7A, 7B, 7C, 7D, 7E, and 7F.

[0124] In the embodiments described above, examples were given in which a vibration reduction device 2, equipped with vibration generators 3A, 3H, 3J, and 3K, was applied to a projector 1, which is an electronic device. However, the electronic device to which the vibration reduction device 2 is applied is not limited to a projector; it may be applied to other electronic devices as well. Furthermore, the vibration generating device of this disclosure may be used independently as a device for generating vibrations, or it may be incorporated into electronic equipment.

[0125] [Summary of this disclosure] A summary of this disclosure is provided below. A vibration generating device according to a first aspect of the present disclosure comprises a base that transmits vibration to an object, a pendulum provided on the base so as to be swingable about a rotation axis, a magnet provided on the pendulum, and a coil provided in a component other than the pendulum and positioned opposite the magnet without contact, and at least one drive unit that applies a driving force to the pendulum, wherein the pendulum has a tip portion which is the end opposite to the rotation axis with respect to the center of the pendulum that extends from the rotation axis in the extension direction in which the pendulum extends from the rotation axis, and a first side portion and a second side portion which are ends that intersect in a direction parallel to the rotation axis and are opposite to each other, and the at least one drive unit includes a first drive unit which is the magnet and has a first magnet provided on the first side portion spaced apart from the rotation axis, and a coil which has a first coil positioned opposite the first magnet without contact.

[0126] In this configuration, the magnets that are in contact with the coil and act on the magnetic force generated by the coil are located on the pendulum. This eliminates the need for wiring to supply current to the pendulum, which is supported on a base so as to be able to swing around a rotation axis. Therefore, damage to the wiring supplying current to the coil during the pendulum's swing can be suppressed, and the pendulum can swing reliably. Consequently, the reliability of the vibration generating device can be increased.

[0127] In the first embodiment described above, the at least one drive unit includes a second drive unit, the second drive unit having the magnet, which is a second magnet provided on the second side surface spaced apart from the rotation axis, and the coil, which is a second coil positioned opposite the second magnet without contact. With this configuration, the vibration generating device comprises at least a first drive unit and a second drive unit, and the pendulum is swung about a rotation axis by the first drive unit and the second drive unit. At this time, the first magnet of the first drive unit is provided on the first side surface of the pendulum, and the second magnet of the second drive unit is provided on the second side surface of the pendulum, which is located opposite to the first side surface. In other words, the first drive unit and the second drive unit are provided on either side of the pendulum in a direction along the rotation axis. This allows the pendulum to swing stably. In addition, since the pendulum can be swung by multiple drive units, the swing of the pendulum can be made larger, and the torque during the swing of the pendulum can be increased. Therefore, the vibrations generated by the vibration generating device can be made larger.

[0128] In the first embodiment described above, the at least one drive unit includes a tip-side drive unit, the tip-side drive unit may include the magnet, which is a tip-side magnet provided at the tip, and the coil, which is a tip-side coil positioned opposite the tip-side magnet without contact. With this configuration, the vibration generator comprises at least a first drive unit and a tip-side drive unit, and the pendulum is swung around the rotation axis by the first drive unit and the tip-side drive unit. As a result, the pendulum can be swung by multiple drive units, which increases the amplitude of the pendulum's swing and thus the torque during the pendulum's swing. Consequently, the vibration generated by the vibration generator can be increased.

[0129] In the first embodiment described above, a control unit may be provided that synchronously and alternately switches the direction of the current supplied to the multiple coils. With this configuration, the control unit synchronously and alternately switches the direction of the current supplied to the coil of the first drive unit and the direction of the current supplied to at least one of the coils of the second drive unit and the tip-side drive unit. This makes it possible to alternately reverse the direction of the magnetic force generated in each coil. As a result, the magnetic force generated in at least one of the coils of the second drive unit and the tip-side drive unit can suppress the interference of the pendulum's swing with respect to the magnetic force generated in the coil of the first drive unit. Therefore, the magnetic force generated in the coil of the first drive unit and the magnetic force generated in at least one of the coils can make the pendulum swing stably, and the torque during the pendulum's swing can be increased.

[0130] In the first embodiment described above, the coil may be attached to the base. With this configuration, the coil can be stably positioned opposite the magnet without contact.

[0131] In the first embodiment described above, the device may include at least one of a magnet-side yoke provided on the opposite side of the coil from the magnet, and a coil-side yoke provided on the opposite side of the magnet from the coil. With this configuration, the magnet-side yoke can increase the magnetic attraction force, and the coil-side yoke can direct the magnetic force generated by the coil towards the magnet. Therefore, the interaction between the magnetic force generated by the coil and the magnet on the pendulum can be strengthened, allowing the current supplied to the coil to swing the pendulum to be reduced.

[0132] In the first embodiment described above, the coil-side yoke may be a ferromagnetic retaining member that holds the coil. With this configuration, the coil is held by the coil-side yoke, eliminating the need to provide separate components for the coil holder and the coil-side yoke. Therefore, the number of parts in the vibration generating device can be reduced.

[0133] In the first embodiment described above, the coil is an air-core coil having a longitudinal axis, and the magnet may be arranged along the longitudinal axis of the coil and facing the coil in a non-contact manner. This configuration allows for a reduction in coil costs compared to coils with a core, and consequently, a reduction in the manufacturing cost of the vibration generator. Furthermore, by arranging the magnets along the longitudinal axis of the coil, it becomes easier to expand the surface area of ​​the magnets that interact with the magnetic force generated by the coil, thereby enhancing the interaction between the coil and the magnets.

[0134] In the first embodiment described above, the coil has a first extending portion that extends along the longitudinal axis and a second extending portion through which current flows in the opposite direction to the first extending portion, and the magnetic poles of the magnet on the surface facing the first extending portion and the magnetic poles of the magnet on the surface facing the second extending portion may be different. With this configuration, the alternating changes in the direction of the magnetic force generated by the coil ensure that the pendulum, to which the magnet is fixed, can swing reliably.

[0135] In the first embodiment described above, the center of gravity of the pendulum may be located closer to the tip than the midpoint of the distance from the axis of rotation to the tip. With this configuration, the torque generated during the pendulum's swing can be adjusted. Therefore, the vibrations generated by the vibration generator can be increased.

[0136] In the first embodiment described above, the pendulum may have a mounting portion at a position spaced apart from the rotation axis toward the tip portion, where a weight can be positioned. With this configuration, the weight and center of gravity of the pendulum can be adjusted by adjusting the weight and placement of the weights in the arrangement section, thereby adjusting the torque generated when the pendulum swings. Consequently, the amplitude of the vibrations generated by the vibration generating device can be adjusted.

[0137] In the first embodiment described above, the pendulum has a first arm extending in a first direction intersecting the axis of rotation and having a tip, a first side portion and a second side portion, and a second arm extending from the axis of rotation in a direction opposite to the first direction, and the at least one drive unit includes a second arm side drive unit, the first magnet of the first drive unit is provided on the first side portion of the first arm, and the second arm side drive unit may have the magnet, a second arm side magnet provided on the second arm at a position spaced apart from the axis of rotation, and the coil, a second arm side coil arranged facing the second arm side magnet in a non-contact manner. With this configuration, a pendulum having a first arm and a second arm can be made to swing like a seesaw. In this case, the vibration generating device has at least a first drive unit having a magnet provided on the first side of the first arm, and a second arm side drive unit having a second arm side magnet provided on the second arm. Therefore, a driving force to swing the pendulum can be applied to each of the first arm and the second arm. Consequently, the pendulum can be made to swing stably.

[0138] In the first embodiment described above, the pendulum may be fixed to the base and may include a plate material that constitutes the rotation axis. With this configuration, the pendulum can be attached to the base in a simple manner so that it can swing. Therefore, the configuration of the vibration generating device can be simplified.

[0139] In the first embodiment described above, the base may have a relief portion to avoid contact with the pendulum. This configuration suppresses noise generation caused by the pendulum contacting the base during its swing, and also allows for a larger stroke during the pendulum's swing.

[0140] A vibration reduction device according to a second aspect of this disclosure comprises a vibration generating device according to the first aspect, a detection unit for detecting vibrations of the object, and an operation control unit for generating vibrations in the vibration generating device that are in the opposite phase to the vibrations detected by the detection unit. With this configuration, the same effects as the vibration generating device according to the first embodiment described above can be achieved. Furthermore, since the vibration generating unit can generate vibrations that are in the opposite phase to the vibrations detected by the detection unit, the vibrations of the object on which the vibration reduction device is installed can be reduced.

[0141] The electronic device according to the third aspect of this disclosure comprises the vibration reduction device according to the second aspect described above. With this configuration, the same effects as the vibration reduction device according to the second embodiment described above can be achieved, and vibrations of electronic equipment can be reduced.

[0142] In the third embodiment described above, the system includes a projection optical device for projecting an image, and the vibration reduction device may be attached to the projection optical device. This configuration reduces vibrations of the projection optical device caused by internal factors of the electronic device or external factors affecting the electronic device. Therefore, it is possible to suppress fluctuations in the image projected onto the projection surface by the projection optical device. [Explanation of Symbols]

[0143] 1...Projector (electronic device), 2...Vibration reduction device, 25...Detection unit, 26...Motion control unit, 3A,3H,3J,3K...Vibration generator, 4A,4G,4J,4K...Base, 5A,5G,5J,5K...Pendulum, 5J1...Arm, 5J2...Connection unit, 5J3...First arm, 5J4...Second arm, 516...Tip, 517...First side, 518...Second side, 6A,6C...Drive unit, 61...First drive unit, 62...Second drive unit, 63...Tip side drive unit, 64...Third drive unit, 65...Fourth drive unit, 7A,7B,7C, 7D,7E,7F...Magnet, 7C1,7E1...First magnet, 7C2,7E2...Second magnet, 7A1,7D1...First magnet member, 7A2,7D2...Second magnet member, 8A,8C...Coil, 8A1...First extension part, 8A2...Second extension part, 8C1...First coil, 8C 11...First extension part, 8C12...Second extension part, 8C2...Second coil, 8C21...First extension part, 8C22...Second extension part, 91...Plate member (magnet side yoke), 92...Holding member (coil side yoke), 921...First plate-like part, 922...Second plate-like part, 93...Terminal part.

Claims

1. A base that transmits vibrations to the object, A pendulum is provided on the base so as to be able to swing around a rotation axis, The system comprises at least two drive units that provide driving force to the pendulum, each having a magnet provided on the pendulum and a coil provided on a component other than the pendulum and positioned opposite the magnet without contact. The aforementioned pendulum, A first arm extending in a first direction intersecting the rotation axis, It has a second arm extending from the rotation axis in a direction opposite to the first direction, The first arm is, In the first direction, the pendulum extends from the axis of rotation and has a tip portion which is the end opposite to the axis of rotation with respect to the center of the pendulum, a first side portion which intersects in a direction parallel to the axis of rotation and is on opposite sides to the first side portion, and a second side portion. The aforementioned at least two drive units include a first drive unit and a second arm-side drive unit, The first drive unit is, The magnet is a first magnet provided on the first side surface spaced apart from the rotation axis, The coil comprises a first coil which is positioned opposite the first magnet in a non-contact manner, The second arm-side drive unit is, The magnet is a second arm-side magnet provided in the second arm at a position spaced apart from the rotation axis, A vibration generating device characterized by having the above-mentioned coil, which is a second arm-side coil positioned opposite the second arm-side magnet in a non-contact manner.

2. In the vibration generating device according to claim 1, The aforementioned at least one drive unit includes a second drive unit, The second drive unit is, The magnet is the aforementioned magnet, and a second magnet is provided on the second side surface spaced apart from the rotation axis, A vibration generating device characterized by having the above-mentioned coil, a second coil, which is arranged opposite the second magnet in a non-contact manner.

3. In the vibration generating device according to claim 1 or claim 2, The aforementioned at least one drive unit includes a front-end drive unit, The aforementioned tip-side drive unit is The aforementioned magnet, comprising a tip-side magnet provided at the tip, A vibration generating device characterized by having the above-mentioned coil, which is a tip-side coil positioned opposite the tip-side magnet in a non-contact manner.

4. In the vibration generating device according to claim 2 or claim 3, A vibration generating device characterized by comprising a control unit that synchronously and alternately switches the direction of the current supplied to a plurality of the aforementioned coils.

5. In a vibration generating device according to any one of claims 1 to 4, A vibration generating device characterized in that the coil is attached to the base.

6. In a vibration generating device according to any one of claims 1 to 5, A vibration generating device characterized by comprising at least one of the following: a magnet-side yoke provided at a position opposite to the coil relative to the magnet, and a coil-side yoke provided at a position opposite to the magnet relative to the coil.

7. In the vibration generating device according to claim 6, The vibration generating device is characterized in that the coil-side yoke is a ferromagnetic material holding member that holds the coil.

8. In a vibration generating device according to any one of claims 1 to 7, The coil is an air-core coil having a longitudinal axis, The vibration generating device is characterized in that the magnet is arranged along the longitudinal axis of the coil and faces the coil in a non-contact manner.

9. In the vibration generating device according to claim 8, The aforementioned coil is A first extending portion extending along the longitudinal axis, It has a second extending portion that extends along the longitudinal axis and through which current flows in the opposite direction to the first extending portion, A vibration generating device characterized in that, in the magnet, the magnetic poles of the surface facing the first extended portion and the magnetic poles of the surface facing the second extended portion are different.

10. In a vibration generating device according to any one of claims 1 to 9, A vibration generating device characterized in that the center of gravity of the pendulum is located closer to the tip than the midpoint of the distance from the axis of rotation to the tip.

11. In a vibration generating device according to any one of claims 1 to 10, The vibration generating device is characterized in that the pendulum has a mounting section at a position spaced apart from the rotation axis toward the tip, where a weight can be placed.

12. In a vibration generating device according to any one of claims 1 to 11, The vibration generating device is characterized in that the pendulum is fixed to the base and comprises a plate material that constitutes the rotation axis.

13. In a vibration generating device according to any one of claims 1 to 12, The vibration generating device is characterized in that the base has a relief portion that avoids contact with the pendulum.

14. A vibration generating device according to any one of claims 1 to 13, A detection unit for detecting vibrations of the object, A vibration reduction device comprising: an operation control unit that causes the vibration generating device to generate vibrations in the opposite phase to the vibrations detected by the detection unit.

15. An electronic device characterized by comprising the vibration reduction device described in claim 14.

16. In the electronic device according to claim 15, Equipped with a projection optical device for projecting images, The electronic device is characterized in that the vibration reduction device is attached to the projection optical device.

Images