WO2013111265A1 - アクチュエータ - Google Patents
アクチュエータ Download PDFInfo
- Publication number
- WO2013111265A1 WO2013111265A1 PCT/JP2012/051384 JP2012051384W WO2013111265A1 WO 2013111265 A1 WO2013111265 A1 WO 2013111265A1 JP 2012051384 W JP2012051384 W JP 2012051384W WO 2013111265 A1 WO2013111265 A1 WO 2013111265A1
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- WO
- WIPO (PCT)
- Prior art keywords
- torsion bars
- torsion
- actuator
- rotation axis
- torsion bar
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0064—Constitution or structural means for improving or controlling the physical properties of a device
- B81B3/0067—Mechanical properties
- B81B3/0078—Constitution or structural means for improving mechanical properties not provided for in B81B3/007 - B81B3/0075
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0035—Constitution or structural means for controlling the movement of the flexible or deformable elements
- B81B3/004—Angular deflection
- B81B3/0045—Improve properties related to angular swinging, e.g. control resonance frequency
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B3/00—Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
- B81B3/0064—Constitution or structural means for improving or controlling the physical properties of a device
- B81B3/0067—Mechanical properties
- B81B3/0072—For controlling internal stress or strain in moving or flexible elements, e.g. stress compensating layers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
- G02B26/085—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD the reflecting means being moved or deformed by electromagnetic means
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2203/00—Basic microelectromechanical structures
- B81B2203/01—Suspended structures, i.e. structures allowing a movement
- B81B2203/0145—Flexible holders
- B81B2203/0154—Torsion bars
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0176—Head mounted characterised by mechanical features
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/10—High frequency vibratory devices
Definitions
- the present invention relates to a technical field of an actuator such as a MEMS scanner that drives a movable part provided with, for example, a mirror.
- MEMS Micro Electro Mechanical System
- a MEMS scanner used for scanning a laser beam is known.
- Such a MEMS scanner includes a movable plate, a frame-shaped support frame that surrounds the movable plate, and a torsion bar that pivotally supports the movable plate so as to be swingable with respect to the support frame.
- Patent Documents 1 to 3 are given as examples.
- the MEMS scanner As a method of utilizing such a MEMS scanner, for example, it is assumed that it is used for a video display device such as a head-up display for projecting a video.
- a video display device such as a head-up display
- the frequency of the swing of the movable plate (for example, the mass of the movable plate and the movable plate as an axis). It is preferable to increase the resonance frequency determined by the spring constant of the torsion bar to be supported.
- Measures to make the torsion bar stiff by thickening or shortening the torsion bar can be considered as one countermeasure for increasing the frequency of the swing of the movable plate.
- simply increasing the thickness of the torsion bar causes a technical problem that the stress applied to the torsion bar increases with the movement of the movable plate by the increase in the thickness of the torsion bar.
- simply shortening the torsion bar causes a technical problem that the stress applied to the torsion bar increases as the movable plate is moved by the amount of shortening of the torsion bar. As a result, there arises a technical problem that such an increase in stress may cause the torsion bar to break.
- the present invention has been made in view of, for example, the above-described conventional problems, and provides an actuator capable of increasing the frequency at which the movable part swings while preventing or suppressing, for example, destruction of the torsion bar. Is an issue.
- the actuator includes a movable part, a support part that supports the movable part, and (i) each of which allows the movable part to swing about a rotation axis along the longitudinal direction. And (ii) a plurality of torsion bars arranged along the short direction, each of the plurality of torsion bars being connected to the movable part and the support part along the longitudinal direction.
- the spring constant becomes smaller as the respective torsion bars become farther from the rotation axis.
- the actuator according to the present embodiment includes a movable part, a support part that supports the movable part, and (i) the longitudinal part so that the movable part can swing about a rotation axis along the longitudinal direction.
- the movable part and the support part are connected along the direction, and (ii) a plurality of torsion bars arranged along the short direction, and the spring constant of each of the plurality of torsion bars is The smaller the respective torsion bars are, the smaller the distance from the rotation axis.
- the movable part suspended by a plurality of torsion bars swings.
- the movable unit may swing so as to rotate about an axis along the direction in which each of the plurality of torsion bars extends (that is, the longitudinal direction of each of the plurality of torsion bars).
- each of the plurality of torsion bars connects the movable part and the support part along the longitudinal direction of each of the torsion bars.
- each of the plurality of torsion bars may directly connect the movable portion and the support portion.
- each of the plurality of torsion bars may indirectly connect the movable portion and the support portion (in other words, with an arbitrary member interposed therebetween).
- the plurality of torsion bars are arranged along the short direction of the plurality of torsion bars (in other words, arranged in parallel). In other words, the plurality of torsion bars are arranged along a direction orthogonal to the rotation axis of the movable part.
- the spring constants of the plurality of torsion bars are adjusted according to the distance between the rotating shaft of the movable part and each of the plurality of torsion bars. More specifically, the spring constant of each of the plurality of torsion bars decreases as the distance between the respective torsion bars increases from the rotation axis (that is, the distance from the rotation axis increases). It has been adjusted. In other words, the spring constant of each of the plurality of torsion bars is adjusted to be smaller as the spring constant of the torsion bar farther from the rotation axis.
- the spring constant of each of the plurality of torsion bars is adjusted so that the spring constant of the torsion bar relatively far from the rotation axis is smaller than the spring constant of the torsion bar relatively close to the rotation axis.
- the spring constants of the plurality of torsion bars are positioned relatively outside the array along the short direction. It can also be expressed that the spring constant of the torsion bar is adjusted so as to be smaller than the spring constant of the torsion bar located relatively on the center side of the arrangement along the short direction.
- the stress applied to the torsion bar when the movable part supported by only one torsion bar located on the rotation axis is swung will be described.
- the stress applied to the edge portions on both sides of the single torsion bar (more specifically, the edge portions on both sides along the short direction of the torsion bar)
- the stress is greater than the stress applied to the central portion (more specifically, the central portion along the short direction of the torsion bar). That is, the stress applied to the edge portion relatively far from the rotation axis in the single torsion bar is larger than the stress applied to the central portion relatively close to the rotation axis in the single torsion bar. That is, the stress applied to the single torsion bar as the movable part moves farther is more likely to be applied as the distance from the rotation axis increases.
- the actuator is relatively far from the rotation axis.
- Stress is easily applied to the torsion bar (that is, the torsion bar having a relatively small spring constant).
- the stress applied to the torsion bar relatively far from the rotation axis is relaxed. For this reason, destruction of the torsion bar relatively far from the rotation axis is suitably prevented or suppressed.
- a large stress is not applied to the torsion bar relatively close to the rotation axis (that is, the torsion bar having a relatively large spring constant).
- the actuator of the present embodiment including the plurality of torsion bars whose spring constants are adjusted according to the distance from the rotation shaft, the breakage of the plurality of torsion bars is preferably prevented or suppressed.
- the spring constant of the torsion bar relatively close to the rotation axis can be relatively increased, the spring constant of the entire plurality of torsion bars can be relatively increased. As a result, it is possible to relatively increase the frequency of the swing of the movable portion determined according to the spring constant of the entire plurality of torsion bars.
- the actuator of this embodiment it is possible to increase the frequency at which the movable part swings while preventing or suppressing the destruction of the plurality of torsion bars.
- variety and length of a some torsion bar may be adjusted suitably so that it may mention later.
- the density of a some torsion bar may be adjusted so that it may mention later.
- the density of each of the plurality of torsion bars may decrease as the distance between the torsion bars increases from the rotation axis.
- the adjustment of the density of each of the plurality of torsion bars may be realized by the presence or absence of holes formed in each of the plurality of torsion bars.
- one or a plurality of holes are formed in a torsion bar that is relatively far from the rotation axis among the plurality of torsion bars, while one or more of the torsion bars that are relatively close to the rotation axis among the plurality of torsion bars.
- the density of the plurality of torsion bars may be adjusted by not forming the plurality of holes.
- the adjustment of the density of each of the plurality of torsion bars may be realized by the number of holes formed in each of the plurality of torsion bars.
- a relatively large number of holes are formed in a torsion bar that is relatively far from the rotation axis, while among a plurality of torsion bars, a relative to a torsion bar that is relatively close to the rotation axis.
- the density of a plurality of torsion bars may be adjusted by forming a small number of holes or not forming holes.
- the adjustment of the density of each of the plurality of torsion bars may be realized by the size of the hole formed in each of the plurality of torsion bars.
- a relatively large hole is formed in a torsion bar that is relatively far from the rotation axis, while relative to a torsion bar that is relatively close to the rotation axis among the plurality of torsion bars.
- the density of a plurality of torsion bars may be adjusted by forming small holes or not forming holes.
- the adjustment of the density of each of the plurality of torsion bars may be realized by the difference in the material constituting each of the plurality of torsion bars.
- the torsion bar relatively far from the rotation axis is made of a material having a relatively low density
- the torsion bar relative to the rotation axis is relatively
- the density of the plurality of torsion bars may be adjusted by using a material having a high density.
- all of the plurality of torsion bars may be completely separated.
- some of the plurality of torsion bars may be connected to other adjacent torsion bars in a bridge shape along the short direction.
- the thickness of the torsion bar (specifically, the thickness along the direction perpendicular to the longitudinal direction and the short direction of the torsion bar). It is also considered that the frequency at which the movable part swings can be increased while preventing or suppressing the destruction of the torsion bar. In this case, it is preferable to increase the thickness of the torsion bar in order to increase the frequency at which the movable part swings while preventing or suppressing the destruction of the torsion bar.
- the movable portion, the support portion, and the torsion bar may be manufactured from a common (in other words, one) semiconductor substrate using a semiconductor manufacturing process.
- the actuator of this embodiment including a plurality of torsion bars whose spring constants are adjusted according to the distance from the rotation axis is more practical than the actuator whose thickness of the torsion bar is adjusted. It is very advantageous.
- the width of each of the plurality of torsion bars becomes narrower as the respective torsion bars become farther from the rotation axis.
- the length of each of the plurality of torsion bars increases as the distance between the torsion bars increases from the rotation axis.
- At least one of the plurality of torsion bars is directed from the support part to the movable part.
- the at least one torsion bar may be bent at least once in a direction intersecting with the extending direction.
- the length of at least one torsion bar can be made relatively long by making the shape of at least one torsion bar into a bent shape. Accordingly, the length of each of the plurality of torsion bars can be adjusted relatively easily.
- the bent shape of the torsion bar refers to, for example, a torsion bar with respect to a direction in which the torsion bar extends from the support part toward the movable part (that is, the longitudinal direction of the torsion bar or the direction of the rotation axis). Examples of shapes that extend once in different directions and then return to the original direction, shapes that the torsion bar extends while meandering, shapes that expand while the torsion bar bends in a zigzag shape, etc. .
- At least one torsion bar is bent as described above, other than one or two torsion bars located on the rotation axis or closest to the rotation axis among the plurality of torsion bars. At least one of the torsion bars has the bent shape, and one or two torsion bars closest to the rotation axis of the plurality of torsion bars have the bent shape. You may comprise so that it may not.
- the torsion bar allows the movable part to swing (for example, Rotating swing) is preferably realized.
- a plurality of torsion bars whose lengths are adjusted according to the distance from the rotation shaft can be realized, but a suitable far-off of the movable part can be realized. Can be realized.
- One or two torsion bars located on the rotation axis or closest to the rotation axis are directed from the support part to the movable part (or from the connection point between the support part and the torsion bar, (Toward the connection point) may have a shape that passes through the shortest path.
- At least one of the plurality of torsion bars is directed from the support part to the movable part. Further, the at least one torsion bar may be configured to be folded at least once in a direction opposite to the extending direction.
- the length of at least one torsion bar can be made relatively long by making the shape of at least one torsion bar folded. Accordingly, the length of each of the plurality of torsion bars can be adjusted relatively easily.
- the shape of the torsion bar folded back means, for example, that the torsion bar extends in the direction in which the torsion bar extends from the support portion toward the movable portion (that is, the longitudinal direction of the torsion bar or the direction of the rotation axis).
- An example is a shape in which a torsion bar is bent (that is, folded) at an angle of 90 degrees or more with respect to the direction.
- the one of the plurality of torsion bars other than one or two torsion bars located on the rotation axis or closest to the rotation axis. At least one of the other torsion bars has the folded shape, and one or two torsion bars closest to the rotation axis of the plurality of torsion bars have the folded shape. You may comprise so that it may not have.
- the torsion bar allows the movable part to swing (for example, , Rotating swing) is preferably realized.
- the shape of the at least one torsion bar is a folded shape, thereby realizing a plurality of torsion bars whose lengths are adjusted according to the distance from the rotation axis, and suitable for the movable part. You can realize faraway.
- One or two torsion bars located on the rotation axis or closest to the rotation axis are directed from the support part to the movable part (or from the connection point between the support part and the torsion bar, (Toward the connection point) may have a shape that passes through the shortest path.
- the density of each of the plurality of torsion bars decreases as the distance between the respective torsion bars increases from the rotation axis.
- At least one of the plurality of torsion bars has one or a plurality of holes. You may comprise as follows.
- the density of at least one torsion bar can be relatively reduced by forming a hole in at least one torsion bar. Therefore, the density of each of the plurality of torsion bars can be adjusted relatively easily.
- the “hole” in the present embodiment may be a hole that penetrates the torsion bar (so-called opening), a hole that does not penetrate the torsion bar (so-called recess), or a torsion bar. It may be a hole (so-called void) formed inside (in other words, not appearing outside).
- the movable portion, the support portion, and the plurality of torsion bars are provided, and the spring constants of the plurality of torsion bars are far from the rotation axis. The smaller it gets. Therefore, it is possible to increase the frequency at which the movable part swings while preventing or suppressing the destruction of the torsion bar.
- FIG. 1 is a plan view showing an example of the configuration of the actuator 1 of the first embodiment.
- the actuator 1 of the first embodiment is a planar electromagnetic drive actuator (that is, a MEMS scanner) used for scanning of laser light, for example.
- the actuator 1 includes an outer support 110, a pair of torsion bars 130, an inner support 210, a plurality of pairs of torsion bars 230, a movable portion 120, a pair of permanent magnets 160, and a pair of power terminals 170. It has.
- the outer support 110, the pair of torsion bars 130, the inner support 210, the plurality of pairs of torsion bars 230, and the movable part 120 are integrally formed from a nonmagnetic substrate such as a silicon substrate, for example. That is, the outer support 110, the pair of torsion bars 130, the inner support 210, the plurality of pairs of torsion bars 230, and the movable portion 120 have a gap by removing a part of a nonmagnetic substrate such as a silicon substrate. It is formed by being formed. A MEMS process is preferably used as the formation process at this time. Instead of the silicon substrate, the outer support 110, the pair of torsion bars 130, the inner support 210, the plurality of pairs of torsion bars 230, and the movable portion 120 may be integrally formed from an arbitrary elastic material. .
- the outer support body 110 has a frame shape surrounding the inner support body 210 and is located on both sides of the inner support body 210 (in other words, the inner support body 210 is sandwiched from both sides of the inner support body 210).
- a pair of torsion bars 130 are connected to the inner support 210.
- FIG. 1 shows an example in which the shape of the outer support 110 is a frame shape, it goes without saying that the shape of the outer support 110 is not limited to the frame shape.
- the outer support 110 may have a frame shape in which a part thereof is open.
- the inner support 210 has a frame shape that surrounds the movable portion 120, and is a direction in which the pair of torsion bars 130 extends (that is, the longitudinal direction of the pair of torsion bars 130, which is the X axis in FIG.
- the outer support 110 is pivotally supported by a pair of torsion bars 130 so as to be swingable around a rotation axis along the direction).
- the inner support 210 is further connected to the movable part 120 by a plurality of pairs of torsion bars 230 located on both sides of the movable part 120 (in other words, sandwiching the movable part 120 from both sides of the movable part 120).
- a drive coil 140 is formed on the surface of the inner support 210.
- the drive coil 140 may be formed inside the inner support 210.
- FIG. 1 shows an example in which the shape of the inner support 210 is a frame shape, it goes without saying that the shape of the inner support 210 is not limited to the frame shape.
- the inner support 210 may have a frame shape in which a part thereof is open.
- the movable unit 120 swings around a rotation axis along a direction in which the plurality of pairs of torsion bars 230 extend (that is, the longitudinal direction of the plurality of pairs of torsion bars 230 and the Y-axis direction in FIG. 1).
- the inner support 210 is pivotally supported by a plurality of pairs of torsion bars 230 so as to be movable.
- a mirror (not shown) that reflects the laser light is formed on the surface of the movable portion 120.
- the pair of torsion bars 130 connect the inner support 210 and the outer support 110 so that the inner support 210 can swing with respect to the outer support 110. Due to the elasticity of the pair of torsion bars 130, the inner support 210 swings so as to rotate about the axis along the direction in which the pair of torsion bars 130 extends. In other words, the inner support 210 swings around the rotation axis with the X axis in FIG. 1 as the rotation axis. At this time, the movable part 120 is connected to the inner support 210 via a plurality of pairs of torsion bars 230. Accordingly, as the inner support 210 swings, the movable part 120 substantially swings around the rotation axis with the X axis in FIG. 1 as the rotation axis.
- Each of the plurality of pairs of torsion bars 230 connects the movable portion 120 and the inner support 210 so that the movable portion 120 can swing with respect to the inner support 210. Due to the elasticity of the plurality of pairs of torsion bars 230, the movable portion 120 swings so as to rotate about an axis along the direction in which the plurality of pairs of torsion bars 230 extend. That is, the movable unit 120 swings around the rotation axis with the Y axis in FIG. 1 as the rotation axis. In addition, the plurality of pairs of torsion bars 230 are arranged in parallel along the short direction of the torsion bars 230.
- the drive coil 140 is, for example, a coil that extends on the inner support 210.
- the drive coil 140 may be formed using, for example, a material having relatively high conductivity (for example, gold or copper).
- the drive coil 140 may be formed using a semiconductor manufacturing process such as a plating process or a sputtering method.
- the driving coil 140 is embedded in the silicon substrate for forming the outer support 110, the pair of torsion bars 130, the inner support 210, the plurality of pairs of torsion bars 230, and the movable part 120 using an implant method. May be.
- the outer shape of the drive coil 140 is simplified and described with emphasis on the visibility of the drawing, but actually, the drive coil 140 is formed on the surface of the inner support 210. And one or more windings.
- the drive coil 140 includes a pair of power terminals 170 formed on the outer support 110 and wiring 150 for electrically connecting the pair of power terminals 170 and the drive coil 140 and a pair of torsion.
- a control current is supplied from the power supply via the wiring 150 formed on the bar 130.
- the control current is a control current for swinging the inner support 210 and the movable part 120.
- the signal component having a frequency synchronized with the frequency at which the inner support 210 swings and the movable part 120 are This is an alternating current including a signal component having a frequency synchronized with the swinging frequency.
- the power source may be a power source provided in the actuator 1 itself or a power source prepared outside the actuator 1.
- the pair of permanent magnets 160 are attached to the outside of the outer support 110. However, the pair of permanent magnets 160 may be attached to any location as long as a predetermined static magnetic field can be applied to the drive coil 140.
- the pair of permanent magnets 160 preferably have their magnetic poles appropriately set so that a predetermined static magnetic field can be applied to the drive coil 140. Note that a yoke may be added to the pair of permanent magnets 160 in order to increase the strength of the static magnetic field.
- the actuator 1 of the first embodiment operates as described above (specifically, the movable part 120 swings), first, from the power source to the drive coil 140 via the power terminal 170 and the wiring 150.
- a control current is supplied.
- the control current supplied to the drive coil 140 includes a signal for swinging the inner support 210 (specifically, a signal synchronized with the swing cycle of the inner support 210) and the movable portion 120. It is preferable that the current be superimposed on a signal for swinging the signal (specifically, a signal synchronized with the period of the swing of the movable unit 120).
- a static magnetic field is applied to the drive coil 140 by a pair of permanent magnets 160.
- a force that is, a Lorentz force
- the inner support 210 on which the drive coil 140 is formed is far away by the Lorentz force resulting from the electromagnetic interaction between the static magnetic field applied from the pair of permanent magnets 160 and the control current supplied to the drive coil 140.
- the inner support 210 swings so as to rotate about the X axis in FIG.
- the movable part 120 is connected to the inner support 210 via a plurality of pairs of torsion bars 230. Accordingly, as the inner support 210 swings, the movable part 120 substantially swings around the rotation axis with the X axis in FIG. 1 as the rotation axis.
- the Lorentz force resulting from the electromagnetic interaction between the static magnetic field applied from the pair of permanent magnets 160 and the control current supplied to the drive coil 140 is transmitted to the movable part 120 as an inertial force.
- the movable unit 120 swings so as to rotate about the Y axis in FIG.
- the movable part 120 is driven in two axes.
- the two-axis drive of the movable part 120 is performed by swinging the inner support 210 using the Lorentz force itself and swinging the movable part 120 using the Lorentz force as an inertial force. It has been broken.
- a drive coil for generating a Lorentz force that causes the movable part 120 to move farther may be formed on the movable part 120.
- the plurality of pairs of torsion bars 230 (and the inner support 210, the pair of torsion bars 130, and the outer support 110) are connected to the movable portion 120 from the power terminal 170 on the outer support 110. It is preferable that a wiring connected to the upper driving coil is formed.
- the width of each of the plurality of pairs of torsion bars 230 is the rotation axis of each of the plurality of pairs of torsion bars 230 and the movable portion 120 (hereinafter, unless otherwise noted, simply referred to as “rotation axis”). In this case, it is adjusted according to the distance from the “rotation axis of the movable portion 120 (that is, the rotation axis along the Y axis)”.
- FIG. 2 is an enlarged plan view showing an example of the detailed shape of a plurality of pairs of torsion bars 230 provided in the actuator 1 of the first embodiment. Note that FIG. 2 will be described with attention paid to the torsion bar 230 disposed on one side (for example, the upper side in FIG. 1) of the movable unit 120 among the plurality of pairs of torsion bars 230. However, the same applies to the torsion bar 230 disposed on the other side of the movable portion 120 (for example, the lower side in FIG. 1) among the plurality of pairs of torsion bars 230.
- the width of each of the plurality of torsion bars 230 arranged in parallel along the short direction (X-axis direction) is such that the distance between the torsion bars 230 and the rotating shaft is increased. It has been adjusted to become thinner. That is, the width of each of the plurality of torsion bars 230 is adjusted so as to increase as the distance between the torsion bars 230 and the rotation shaft becomes shorter. In other words, the width of each of the plurality of torsion bars 230 is adjusted so as to become thinner as the torsion bar 230 is further away from the rotation axis. That is, the width of each of the plurality of torsion bars 230 is adjusted so as to increase as the torsion bar 230 approaches the rotation axis.
- the width of each of the plurality of torsion bars 230 is adjusted so that the torsion bar 230 farther from the rotation axis becomes thinner. That is, the width of each of the plurality of torsion bars 230 is adjusted so that the torsion bar 230 closer to the rotation axis becomes thicker.
- a plurality of torsion bars 230 includes (i) two torsion bars 230a whose distance from the rotation axis is D1, and (ii) a distance from the rotation axis is D2 (however, An example including two torsion bars 230b satisfying D2 ⁇ D1) and (iii) a torsion bar 230c located on the rotation axis (that is, the distance from the rotation axis becomes zero) will be described.
- the width of the torsion bar 230a is da
- the width of the torsion bar 230b is db
- the width of the torsion bar 230c is dc
- the width has been adjusted.
- FIG. 1 shows an example in which the torsion bar 230c located at the center of the plurality of torsion bars 230 is located on the rotation axis.
- the distance between the torsion bar 230 and the rotation axis depends on whether the torsion bar 230 is located relatively on the center side or outside in the arrangement of the plurality of torsion bars 230. Become. Therefore, when the torsion bar 230c located at the center of the plurality of torsion bars 230 is located on the rotation axis, the width of each of the plurality of torsion bars 230 is relative to the arrangement in the short direction.
- the width of the torsion bar 230 (for example, the torsion bar 230a) positioned on the outer side is adjusted so as to be relatively narrower than the width of the torsion bar (for example, the torsion bar 230c) positioned on the center side. . That is, it can be said that the width of each of the plurality of torsion bars 230 is adjusted so as to be thinner as the torsion bars 230 are positioned relatively outside the array along the short direction.
- the plurality of torsion bars 230 are preferably arranged so as to be line-symmetric with respect to the rotation axis of the movable unit 120.
- the actuator 1 includes an odd number of torsion bars 230
- one of the odd number of torsion bars 230 is located on the rotation axis.
- the actuator 1 includes an even number of torsion bars 230
- the two torsion bars 230 at the center of the even number of torsion bars 230 are arranged at positions that are line-symmetric with respect to the rotation axis. It is preferable.
- the spring constant of each of the plurality of torsion bars 230 becomes smaller as the torsion bar 230 becomes farther from the rotation axis. That is, the spring constant of each of the plurality of torsion bars 230 is adjusted to increase as the torsion bar 230 approaches the rotation axis. In other words, the spring constant of each of the plurality of torsion bars 230 is adjusted so as to become smaller as the torsion bar 230 is farther from the rotation axis. That is, the spring constant of each of the plurality of torsion bars 230 is adjusted to be larger as the torsion bar 230 is closer to the rotation axis.
- FIG. 3 is an enlarged plan view showing an example of the configuration of an actuator of a comparative example that rotates the movable portion 120 using only one torsion bar 1230 located on the rotation axis.
- the edge portions on both sides of the torsion bar 1230 (more specifically, both sides along the short direction of the torsion bar 230). Stress corresponding to the left and right edge portions in FIG. 3) is greater than the stress applied to the central portion (more specifically, the central portion along the short direction of the torsion bar). . That is, the stress applied to the edge portion of the torsion bar 1230 that is relatively far from the rotation axis is greater than the stress applied to the center portion of the torsion bar 1230 that is relatively close to the rotation axis. That is, the stress applied to the torsion bar 1230 as the movable part 120 moves farther is more likely to be applied as the distance from the rotation axis becomes relatively longer.
- the actuator 1 of the first embodiment including a plurality of torsion bars 230 that become narrower as the distance from the rotation axis (that is, the spring constant becomes smaller).
- the spring constant is relatively small because the width is relatively thin, the stress applied to the torsion bar 230 relatively far from the rotation axis is relaxed.
- the torsion bar 230 relatively far from the rotation axis becomes relatively soft, and as a result, the torsion bar relatively far from the rotation axis.
- the stress applied to 230 is relaxed. For this reason, destruction of the torsion bar 230 relatively far from the rotation axis is suitably prevented or suppressed.
- the torsion bar 230 that is relatively close to the rotation axis (that is, the torsion bar 230 having a relatively large width and a relatively large spring constant) is not so much stressed. . For this reason, destruction of the torsion bar 230 relatively close to the rotation axis is also preferably prevented or suppressed.
- the width is relatively thick
- the spring constant is relatively large, so that the torsion bar 230 relatively close to the rotation axis is relatively hard.
- the breakage of the torsion bar 230 relatively close to the rotation axis is also preferably prevented or suppressed.
- the widths (or spring constants) of the plurality of torsion bars 230 are adjusted according to the distance from the rotation axis. Destruction is preferably prevented or prevented.
- the actuator 1 of the first embodiment it is possible to make the width of the torsion bar 230 relatively close to the rotation axis relatively thick while preventing or suppressing the destruction of the plurality of torsion bars 230 ( That is, the spring constant can be relatively increased).
- the spring constant of the torsion bar 1230 can be increased by increasing the width of the torsion bar 1230
- the torsion bar 1230 is increased by the increased width. 1230 will be easily destroyed.
- the actuator 1 of the first embodiment in consideration of the trade-off relationship between the destruction of the torsion bar 230 and the increase in the spring constant of the torsion bar 230, the plurality of torsion bars 230 are destroyed.
- the width of the torsion bar 230 relatively far from the rotation axis can be made relatively narrow while the width of the torsion bar 230 relatively close to the rotation axis can be made relatively thick.
- the spring constant of the plurality of torsion bars 230 as a whole can be relatively increased.
- the actuator 1 of the first embodiment is applied to a video display device such as a head-up display, the swing caused by the elasticity of the pair of torsion bars 130 (that is, the swing using the X axis as the rotation axis).
- the frequency of the swinging with the Y axis as the rotation axis can be increased.
- the frequency at which the movable part 120 swings due to the elasticity of the plurality of pairs of torsion bars 230 can be increased.
- the actuator 1 of the first embodiment it is possible to increase the frequency at which the movable unit 120 swings while preventing or suppressing the destruction of the plurality of torsion bars 230.
- the actuator 1 is replaced with a plurality of pairs of torsion bars 130 (that is, a plurality of pairs of torsion bars 230 whose widths are adjusted in accordance with the distance from the rotation axis of the inner support 210 instead of the pair of torsion bars 130. Torsion bar). That is, the actuator 1 may be provided with a plurality of pairs of torsion bars 130 that become narrower as the distance from the rotation axis of the inner support 210 becomes smaller than the pair of torsion bars 130. Alternatively, when the actuator 1 includes a plurality of pairs of torsion bars 130 whose widths are adjusted according to the distance from the rotation axis of the inner support 210, the width is determined according to the distance from the rotation axis of the movable unit 120. Instead of the plurality of pairs of torsion bars 230 adjusted to be, a pair of torsion bars 230 (that is, a torsion bar similar to the pair of torsion bars 130) may be provided.
- FIG. 4 is an enlarged plan view showing an example of details of the shape of a plurality of pairs of torsion bars 230 provided in the actuator 2 of the second embodiment.
- the same referential mark is attached
- the widths of a plurality of pairs of torsion bars 230 are adjusted in accordance with the distance between the rotation shaft and the actuator 1 of the first embodiment.
- the length of the plurality of pairs of torsion bars 230 (specifically, the length along the longitudinal direction of each of the plurality of pairs of torsion bars 230) according to the distance from the rotation axis. Is different in that it has been adjusted.
- the other components of the actuator 2 of the second embodiment may be the same as the other components of the actuator 1 of the first embodiment.
- the length of each of the plurality of torsion bars 230 arranged in parallel along the short direction (X-axis direction) is the torsion bar.
- the distance between 230 and the rotation axis is adjusted to be longer as the distance is longer. That is, the length of each of the plurality of torsion bars 230 is adjusted to be shorter as the distance between the torsion bars 230 and the rotating shaft is shorter. In other words, the length of each of the plurality of torsion bars 230 is adjusted to be longer as the torsion bar 230 is farther from the rotation axis.
- the length of each of the plurality of torsion bars 230 is adjusted to be shorter as the torsion bars 230 are closer to the rotation axis. In other words, the length of each of the plurality of torsion bars 230 is adjusted to be longer as the torsion bar 230 is farther from the rotation axis. That is, the length of each of the plurality of torsion bars 230 is adjusted to be shorter as the torsion bar 230 is closer to the rotation axis.
- a plurality of torsion bars 230 includes (i) two torsion bars 230a whose distance from the rotation axis is D1, and (ii) a distance from the rotation axis is D2 (however, An example including two torsion bars 230b satisfying D2 ⁇ D1) and (iii) a torsion bar 230c located on the rotation axis (that is, the distance from the rotation axis becomes zero) will be described.
- the length of the torsion bar 230a is La
- the length of the torsion bar 230b is Lb
- the length of the torsion bar 230c is Lc
- a plurality of torsion bars are established so that a relationship of La> Lb> Lc is established.
- the length of the bar 230 is adjusted.
- the length of each of the plurality of torsion bars 230 is set to be relatively to the outside of the array along the short direction (for example, It can be said that the length of the torsion bar 230a) is adjusted so as to be longer than the length of the torsion bar (for example, the torsion bar 230c) positioned relatively on the center side.
- the respective spring constants of the plurality of torsion bars 230 are adjusted between the torsion bars 230 and the rotation shafts by adjusting the lengths of the plurality of torsion bars 230. The larger the distance between, the smaller. Therefore, even if it is the actuator 2 of 2nd Example, it can enjoy suitably the various effects which the actuator 1 of 1st Example can enjoy.
- FIG. 5 is an enlarged plan view showing an example of the detailed shape of a plurality of pairs of torsion bars 230 provided in the actuator 3 of the third embodiment. Note that the same reference numerals are given to the same components as those provided in the actuator 1 of the first embodiment to the actuator 2 of the second embodiment, and the detailed description thereof is omitted.
- the widths of the plurality of pairs of torsion bars 230 are adjusted in accordance with the distance between the rotation shaft and the actuator 1 of the first embodiment.
- the length of the plurality of pairs of torsion bars 230 (specifically, the length along the longitudinal direction of each of the plurality of pairs of torsion bars 230) according to the distance from the rotation axis Is different in that it has been adjusted. That is, the actuator 3 of the third embodiment corresponds to an actuator in which the constituent elements of the actuator 1 of the first embodiment and the constituent elements of the actuator 2 of the second embodiment are combined.
- the other components of the actuator 3 of the third embodiment may be the same as the other components of the actuator 1 of the first embodiment.
- the actuator 3 of the third embodiment Even in the actuator 3 of the third embodiment, various effects that can be enjoyed by the actuator 1 of the first embodiment and the actuator 2 of the second embodiment can be suitably enjoyed.
- the actuator 3 of the third embodiment since both the width and length of the plurality of torsion bars 230 are adjusted, the spring constants of the plurality of torsion bars 230 can be adjusted with higher accuracy. .
- FIG. 6 is an enlarged plan view showing an example of the detailed shape of a plurality of pairs of torsion bars 230 provided in the actuator 4 of the fourth embodiment.
- the same components as those of the actuator 1 of the first embodiment to the actuator 3 of the third embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the actuator 4 of the fourth embodiment is such that each of the plurality of torsion bars 230 bites into both the movable portion 120 and the inner support 210 as compared with the actuator 2 of the second embodiment. It differs in that it has a shape.
- the other components of the actuator 4 of the fourth embodiment may be the same as the other components of the actuator 2 of the second embodiment.
- a notch for adjusting the length of each of the plurality of torsion bars 230 is formed in an area portion on the movable unit 120 where the movable unit 120 and each of the plurality of torsion bars 230 are connected. ing. That is, in the second embodiment and the third embodiment, an area portion that constitutes a part of the movable portion 120 is an area portion that constitutes a part of the plurality of torsion bars 230 (that is, a plurality of portions).
- the torsion bar 230 is treated as an area portion for increasing the length.
- a notch for adjusting the length of each of the plurality of torsion bars 230 is formed in a region on the inner support 210 where the inner support 210 and each of the plurality of torsion bars 230 are connected.
- the region portion that constitutes a part of the inner support 210 is the region portion that constitutes a part of the plurality of torsion bars 230 in the fourth embodiment (that is, The actuator 4 according to the fourth embodiment can be enjoyed by the actuator 2 according to the second embodiment even if the actuator 4 according to the fourth embodiment is treated as an area for increasing the length of the plurality of torsion bars 230. An effect can be enjoyed suitably.
- the actuator 4 of the fourth embodiment has a shape that causes the inner support 210 and the movable portion 120 to protrude or protrude toward the plurality of torsion bars 230 in order to adjust the lengths of the plurality of torsion bars 230. (Refer to the shapes of the inner support 210 and the movable portion 120 in FIGS. 4 and 5).
- FIG. 6 illustrates the actuator 4 having such a shape that each of the plurality of torsion bars 230 bites into both the movable portion 120 and the inner support 210.
- the actuator 4 may have a shape such that at least one of the plurality of torsion bars 230 bites into at least the movable part 120 and the inner support 210.
- FIG. 7 is an enlarged plan view showing an example of the detailed shape of a plurality of pairs of torsion bars 230 provided in the actuator 5 of the fifth embodiment. Note that the same reference numerals are given to the same components as those provided in the actuator 1 of the first embodiment to the actuator 4 of the fourth embodiment, and detailed description thereof will be omitted.
- the actuator 5 of the fifth embodiment at least a part of the plurality of torsion bars 230 is moved from the inner support 210 to the movable portion 120 as compared with the actuator 2 of the second embodiment. It differs in that it extends not only in the direction (Y-axis direction in FIG. 7) but also in the direction bent from that direction (X-axis direction in FIG. 7).
- the other components of the actuator 5 of the fifth embodiment may be the same as the other components of the actuator 2 of the second embodiment.
- FIG. 7 shows an example in which the actuator 5 includes an odd number of torsion bars 230.
- the actuator 5 includes an odd number of torsion bars 230.
- one torsion bar 230 c at the center of the odd number of torsion bars 230 extends only in the direction from the inner support 210 toward the movable part 120. That is, it is preferable that one torsion bar 230c at the center of the odd number of torsion bars 230 does not extend in a direction bent from the direction toward the movable part 120 from the inner support 210.
- FIG. 7 shows an example in which one of the odd number of torsion bars 230 is located on the rotation axis.
- the one torsion bar 230 closest to the rotation axis is located on the inner side. It is preferable to extend only in the direction from the support 210 to the movable part 120.
- one torsion bar 230 at the center of the plurality of torsion bars 230 is disposed at a position deviated from the rotation axis of the movable portion 120, it is closest to the rotation axis and symmetrical with respect to the rotation axis. It is preferable that at least two torsion bars 230 are extended only in the direction from the inner support 210 toward the movable part 120.
- the actuator 5 of the fifth embodiment Even with the actuator 5 of the fifth embodiment, various effects that can be enjoyed by the actuator 2 of the second embodiment can be suitably enjoyed.
- the length of the plurality of torsion bars 230 can be suitably adjusted while suppressing an increase in the space occupied by the plurality of torsion bars 230.
- one torsion bar 230 located on the rotation axis or closest to the rotation axis does not have a bent shape. For this reason, due to the presence of the torsion bar 230 that does not have a bent shape, the hardness of the plurality of torsion bars 230 as a whole in a direction other than the rotation direction of the movable portion 120 is relatively increased. Can do. However, one torsion bar 230 located on the rotation axis or closest to the rotation axis may have a bent shape.
- FIG. 8 is an enlarged plan view showing an example of the detailed shape of a plurality of pairs of torsion bars 230 provided in the actuator 6 of the sixth embodiment.
- the same components as those of the actuator 1 of the first embodiment to the actuator 5 of the fifth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the actuator 6 of the sixth embodiment is different from the actuator 5 of the fifth embodiment in that an even number of torsion bars 230 are provided.
- the other components of the actuator 6 of the sixth embodiment may be the same as the other components of the actuator 5 of the fifth embodiment.
- the two torsion bars 230c at the center of the even number of torsion bars 230 extend only in the direction from the inner support 210 to the movable part 120. That is, it is preferable that the two torsion bars 230c at the center of the even number of torsion bars 230 do not extend in the direction bent from the direction toward the movable part 120 from the inner support 210.
- FIG. 8 shows an example in which the center two torsion bars 230c among the even number of torsion bars 230 are positioned closest to the rotation axis.
- one torsion bar 230 closest to the rotation axis is It is preferable to extend only in the direction from the inner support 210 toward the movable part 120.
- the other torsion bars 230 other than the central two torsion bars 230 among the plurality of torsion bars 230 are positioned closest to the rotation axis, they are closest to the rotation axis and lined with respect to the rotation axis. It is preferable that at least two symmetrical torsion bars 230 extend only in the direction from the inner support 210 toward the movable part 120.
- the rotational direction of the movable portion 120 is the same as that of the actuator 5 of the fifth embodiment.
- the hardness of the plurality of torsion bars 230 as a whole in directions other than the above can be made relatively hard.
- the two torsion bars 230 located on the rotation shaft or closest to the rotation shaft may have a bent shape.
- FIG. 9 is an enlarged plan view showing an example of the detailed shape of a plurality of pairs of torsion bars 230 provided in the actuator 7 of the seventh embodiment. Note that the same reference numerals are given to the same components as those provided in the actuator 1 of the first embodiment to the actuator 6 of the sixth embodiment, and the detailed description thereof is omitted.
- the actuator 7 of the seventh embodiment has at least a part of the plurality of torsion bars 230 from the inner support 210 to the movable portion 120 as compared to the actuator 2 of the second embodiment.
- the direction opposite to the direction the direction from the bottom to the top in FIG. 7
- the direction folded when viewed from the direction That is, it is a direction that has an angle of at least 90 ° or more on the basis of the direction and is returned and extends from the bottom to the top in FIG. 7).
- the other components of the actuator 7 of the seventh embodiment may be the same as the other components of the actuator 2 of the second embodiment.
- FIG. 9 shows an example in which the actuator 7 includes an odd number of torsion bars 230. Accordingly, also in the actuator 7 of the seventh embodiment, like the actuator 5 of the fifth embodiment, one torsion bar 230 closest to the rotation axis extends only in the direction from the inner support 210 to the movable portion 120. It is preferable. However, when the actuator 7 is provided with an even number of torsion bars 230, the two torsion bars 230c at the center closest to the rotation axis are movable from the inner support body 210, as in the actuator 6 of the sixth embodiment. It is preferable to extend only in the direction toward the portion 120.
- the actuator 7 of the seventh embodiment Even in the actuator 7 of the seventh embodiment, various effects that can be enjoyed by the actuator 2 of the second embodiment can be suitably enjoyed.
- the actuator 7 of the seventh embodiment it is possible to adjust the lengths of the plurality of torsion bars 230 while suppressing an increase in the space occupied by the plurality of torsion bars 230.
- one torsion bar 230 located on the rotation axis or closest to the rotation axis does not have a folded shape. For this reason, due to the presence of the torsion bar 230 that does not have the folded shape, the hardness of the plurality of torsion bars 230 as a whole in a direction other than the rotation direction of the movable portion 120 is relatively increased. be able to. However, one torsion bar 230 located on the rotation axis or closest to the rotation axis may have a folded shape.
- FIG. 10 is an enlarged plan view showing an example of details of the shape of a plurality of pairs of torsion bars 230 provided in the actuator 8 of the eighth embodiment. Note that the same reference numerals are assigned to the same components as those provided in the actuator 1 of the first embodiment to the actuator 7 of the seventh embodiment, and the detailed description thereof is omitted.
- the widths of the plurality of pairs of torsion bars 230 are adjusted in accordance with the distance between the rotation shaft and the actuator 1 of the first embodiment. Instead, the difference is that the density of the plurality of pairs of torsion bars 230 is adjusted according to the distance from the rotation axis.
- the other components of the actuator 8 of the eighth embodiment may be the same as the other components of the actuator 1 of the first embodiment.
- the density of each of the plurality of torsion bars 230 arranged in parallel along the short direction (X-axis direction) is between the torsion bar 230 and the rotation axis.
- the distance is adjusted to be smaller as the distance increases. That is, the density of each of the plurality of torsion bars 230 is adjusted so as to increase as the distance between the torsion bars 230 and the rotation shaft becomes shorter.
- the density of each of the plurality of torsion bars 230 is adjusted to be smaller as the torsion bar 230 is farther from the rotation axis. That is, the density of each of the plurality of torsion bars 230 is adjusted to increase as the torsion bar 230 approaches the rotation axis.
- the density of each of the plurality of torsion bars 230 is adjusted to be smaller as the torsion bar 230 is farther from the rotation axis. That is, the density of each of the plurality of torsion bars 230 is adjusted to increase as the torsion bar 230 is closer to the rotation axis.
- a hole 231 is formed in at least one of the plurality of torsion bars 230 in order to adjust the density of each of the plurality of torsion bars 230.
- the hole 231 may be a hole 231 that penetrates the torsion bar 230 (so-called opening), a hole 231 that does not penetrate the torsion bar 230 (so-called recess), or the hole 231 of the torsion bar 230. It may be a hole 231 (so-called void) formed inside (in other words, not appearing outside).
- the number of holes 231 formed in each of the plurality of torsion bars 230 may decrease as the distance between the torsion bars 230 and the rotation shaft increases. Thereby, the density of each of the plurality of torsion bars 230 decreases as the distance between the torsion bars 230 and the rotation shaft increases.
- the density of each of the plurality of torsion bars 230 is adjusted, so that the spring constant of each of the plurality of torsion bars 230 is between the torsion bar 230 and the rotating shaft. The smaller the distance between them, the smaller. Therefore, even with the actuator 8 of the eighth embodiment, various effects that can be enjoyed by the actuator 1 of the first embodiment can be suitably enjoyed.
- FIG. 8 shows that the number of holes 231 formed in each of the plurality of torsion bars 230 is reduced as the distance between the torsion bars 230 and the rotation shaft increases, so that the distance between the rotation shafts is reduced.
- An example in which the density of a plurality of pairs of torsion bars 230 is adjusted according to the distance is shown. However, by increasing the size (for example, diameter, depth, etc.) of the hole 231 formed in each of the plurality of torsion bars 230 as the distance between the torsion bar 230 and the rotation shaft increases, The density of the plurality of pairs of torsion bars 230 may be adjusted according to the distance between the rotating shafts.
- the density of the plurality of pairs of torsion bars 230 may be adjusted according to the distance from the rotation axis by changing the material constituting each of the plurality of torsion bars 230.
- the density of the plurality of pairs of torsion bars 230 may be adjusted according to the distance from the rotation axis using some other method. In any case, various effects that can be enjoyed by the actuator 1 of the first embodiment can be suitably enjoyed.
- FIG. 11 is a plan view showing an example of the configuration of the actuator 9 of the ninth embodiment.
- the same components as those of the actuator 1 of the first embodiment to the actuator 8 of the eighth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.
- the actuator 9 of the ninth embodiment is different from the actuator 2 of the second embodiment in that the extension modes of the torsion bars 230 are different.
- the other components of the actuator 9 of the ninth embodiment may be the same as the other components of the actuator 1 of the first embodiment.
- the torsion bar 232 relatively close to the rotation axis extends linearly from the movable part 120 toward the inner support 210.
- the torsion bar 233 that is relatively far from the rotation axis among the plurality of torsion bars 230 extends along a curved line or a broken line along the inner edge of the inner support 210.
- FIG. 12 is a plan view showing an example of the configuration of the actuator 10 of the tenth embodiment.
- the same components as those of the actuator 1 of the first embodiment to the actuator 9 of the ninth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
- the actuator 10 of the tenth embodiment is different from the actuator 1 of the first embodiment that performs the biaxial drive of the movable portion 120 in that the movable portion 120 is driven in a single axis.
- the actuator 10 of the tenth embodiment includes an outer support 110, a plurality of pairs of torsion bars 230, a movable part 120, a pair of permanent magnets 160, and a pair of power terminals 170. Yes. That is, the actuator 10 of the tenth embodiment differs from the actuator 1 of the first embodiment in that it does not include the pair of torsion bars 130 and the inner support 210.
- the outer support 110, the plurality of pairs of torsion bars 230, and the movable portion 120 are integrally formed from a nonmagnetic substrate such as a silicon substrate, for example. That is, the outer support 110, the plurality of pairs of torsion bars 230, and the movable portion 120 are formed by forming a gap by removing a part of a nonmagnetic substrate such as a silicon substrate.
- a MEMS process is preferably used as the formation process at this time. In addition, it replaces with a silicon substrate and the outer side support body 110, a some pair of torsion bar 230, and the movable part 120 may be integrally formed from arbitrary elastic materials.
- the outer support 110 has a frame shape surrounding the movable part 120 and is located on both sides of the movable part 120 (in other words, sandwiching the movable part 120 from both sides of the movable part 120).
- the torsion bar 230 is connected to the movable part 120.
- the movable unit 120 swings around a rotation axis along a direction in which the plurality of pairs of torsion bars 230 extend (that is, the longitudinal direction of the plurality of pairs of torsion bars 230 and in the direction of the X axis in FIG. 12).
- the outer support 110 is pivotally supported by a plurality of pairs of torsion bars 230 so as to be movable.
- a mirror (not shown) that reflects the laser light is formed on the surface of the movable portion 120.
- a drive coil 140 is formed on the surface of the movable portion 120. However, the drive coil 140 may be formed inside the movable part 120.
- Each of the plurality of pairs of torsion bars 230 connects the movable portion 120 and the outer support 110 so that the movable portion 120 can swing with respect to the outer support 110. Due to the elasticity of the plurality of pairs of torsion bars 230, the movable portion 120 swings so as to rotate about an axis along the direction in which the plurality of pairs of torsion bars 230 extend. That is, the movable unit 120 swings around the rotation axis with the X axis in FIG. 12 as the rotation axis.
- the drive coil 140 includes a pair of power supply terminals 170 formed on the outer support 110 and wiring 150 for electrically connecting the pair of power supply terminals 170 and the drive coil 140, and a plurality of pairs.
- a control current is supplied from the power source via the wiring 150 formed on the torsion bar 230.
- the control current is a control current for swinging the movable portion 120, and is typically an alternating current including a signal component having a frequency synchronized with the frequency at which the movable portion 120 swings.
- the power source may be a power source provided in the actuator 1 itself or a power source prepared outside the actuator 1.
- the actuator 10 of the tenth embodiment operates (specifically, the movable part 120 swings), first, from the power supply to the drive coil 140 via the power supply terminal 170 and the wiring 150. In contrast, a control current is supplied. At this time, the control current supplied to the drive coil 140 is a current including a signal for swinging the movable portion 120 (specifically, a signal synchronized with the swing cycle of the movable portion 120). Is preferred. On the other hand, a static magnetic field is applied to the drive coil 140 by a pair of permanent magnets 160.
- a force that is, a Lorentz force
- the movable part 120 in which the drive coil 140 is formed swings due to the Lorentz force resulting from the electromagnetic interaction between the static magnetic field applied from the pair of permanent magnets 160 and the control current supplied to the drive coil 140.
- the movable part 120 swings so as to rotate about the X axis in FIG.
- the movable portion 120 is driven in one axis. And even if it is the actuator 10 which performs the uniaxial drive of the movable part 120, since the several torsion bar 230 is provided, the various effects which the actuator 1 of 1st Example can enjoy suitably are enjoyed. can do.
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Abstract
Description
以下、図1を参照して、第1実施例のアクチュエータ1について説明する。図1は、第1実施例のアクチュエータ1の構成の一例を示す平面図である。
続いて、図4を参照して、第2実施例のアクチュエータ2について説明する。図4は、第2実施例のアクチュエータ2が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図5を参照して、第3実施例のアクチュエータ3について説明する。図5は、第3実施例のアクチュエータ3が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1から第2実施例のアクチュエータ2が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図6を参照して、第4実施例のアクチュエータ4について説明する。図6は、第4実施例のアクチュエータ4が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1から第3実施例のアクチュエータ3が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
このような第4実施例のアクチュエータ4であっても、第2実施例のアクチュエータ2が享受することができる各種効果を好適に享受することができる。特に、第4実施例のアクチュエータ4は、複数のトーションバー230の長さを調整するために内側支持体210及び可動部120を複数のトーションバー230側に向かって張り出させる又は飛び出させなる形状(図4及び図5の内側支持体210及び可動部120の形状参照)を有していなくともよい。
続いて、図7を参照して、第5実施例のアクチュエータ5について説明する。図7は、第5実施例のアクチュエータ5が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1から第4実施例のアクチュエータ4が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図8を参照して、第6実施例のアクチュエータ6について説明する。図8は、第6実施例のアクチュエータ6が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1から第5実施例のアクチュエータ5が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図9を参照して、第7実施例のアクチュエータ7について説明する。図9は、第7実施例のアクチュエータ7が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1から第6実施例のアクチュエータ6が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図10を参照して、第8実施例のアクチュエータ8について説明する。図10は、第8実施例のアクチュエータ8が備える複数の一対のトーションバー230の形状の詳細の一例を示す拡大平面図である。尚、第1実施例のアクチュエータ1から第7実施例のアクチュエータ7が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図11を参照して、第9実施例のアクチュエータ9について説明する。図11は、第9実施例のアクチュエータ9の構成の一例を示す平面図である。尚、第1実施例のアクチュエータ1から第8実施例のアクチュエータ8が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
続いて、図12を参照して、第10実施例のアクチュエータ10について説明する。図12は、第10実施例のアクチュエータ10の構成の一例を示す平面図である。尚、第1実施例のアクチュエータ1から第9実施例のアクチュエータ9が備える構成要素と同一の構成要素については、同一の参照符号を付してその詳細な説明については省略する。
210 内側支持部
120 可動部
130 トーションバー
230 トーションバー
231 孔
140 駆動コイル
150 配線
160 永久磁石
Claims (9)
- 可動部と、
当該可動部を支持する支持部と、
(i)夫々が、長手方向に沿った回転軸を中心として前記可動部が揺動可能なように、前記長手方向に沿って前記可動部と前記支持部とを接続すると共に、(ii)短手方向に沿って配列される複数のトーションバーと
を備えており、
前記複数のトーションバーの夫々のバネ定数は、前記夫々のトーションバーが前記回転軸から遠くなればなるほど小さくなることを特徴とするアクチュエータ。 - 前記複数のトーションバーの夫々の幅は、前記夫々のトーションバーが前記回転軸から遠くなればなるほど細くなることを特徴とする請求項1に記載のアクチュエータ。
- 前記複数のトーションバーの夫々の長さは、前記夫々のトーションバーが前記回転軸から遠くなればなるほど長くなることを特徴とする請求項1に記載のアクチュエータ。
- 前記複数のトーションバーのうちの少なくとも一つは、前記支持部から前記可動部に向かうように前記少なくとも一つのトーションバーが伸長する方向と交わる方向に少なくとも1回以上折れ曲がった形状を有していることを特徴とする請求項3に記載のアクチュエータ。
- 前記複数のトーションバーのうち前記回転軸上に位置する又は前記回転軸に最も近い一つ又は二つのトーションバー以外の他のトーションバーのうちの少なくとも一つは、前記折れ曲がった形状を有しており、
前記複数のトーションバーのうち前記回転軸に最も近い一つ又は二つのトーションバーは、前記折れ曲がった形状を有していないことを特徴とする請求項4に記載のアクチュエータ。 - 前記複数のトーションバーのうちの少なくとも一つは、前記支持部から前記可動部に向かうように前記少なくとも一つのトーションバーが伸長する方向とは逆の方向に向かって少なくとも1回以上折り返された形状を有していることを特徴とする請求項3に記載のアクチュエータ。
- 前記複数のトーションバーのうち前記回転軸上に位置する又は前記回転軸に最も近い一つ又は二つのトーションバー以外の他のトーションバーのうちの少なくとも一つは、前記折り返された形状を有しており、
前記複数のトーションバーのうち前記回転軸に最も近い一つ又は二つのトーションバーは、前記折り返された形状を有していないことを特徴とする請求項6に記載のアクチュエータ。 - 前記複数のトーションバーの夫々の密度は、前記夫々のトーションバーが前記回転軸から遠くなればなるほど小さくなることを特徴とする請求項1に記載のアクチュエータ。
- 前記複数のトーションバーのうちの少なくとも一つには、一又は複数の孔が形成されていることを特徴とする請求項8に記載のアクチュエータ。
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