WO2014192193A1 - 駆動装置 - Google Patents
駆動装置 Download PDFInfo
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- WO2014192193A1 WO2014192193A1 PCT/JP2013/084142 JP2013084142W WO2014192193A1 WO 2014192193 A1 WO2014192193 A1 WO 2014192193A1 JP 2013084142 W JP2013084142 W JP 2013084142W WO 2014192193 A1 WO2014192193 A1 WO 2014192193A1
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- WIPO (PCT)
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- base
- coil
- mems scanner
- driving force
- driven
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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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- 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
- G02B26/0841—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 element being moved or deformed by electrostatic 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
- G02B26/105—Scanning systems with one or more pivoting mirrors or galvano-mirrors
Definitions
- the present invention relates to a technical field of a driving device such as a MEMS scanner that drives a driven object such as a mirror.
- MEMS Micro Electro Mechanical System
- a display field in which light incident from a light source is scanned with respect to a predetermined screen region to embody an image, or light reflected by scanning light with respect to a predetermined screen region.
- a micro-structured mirror driving device optical scanner or MEMS scanner
- Mirror drive devices generally have a configuration in which a mirror is driven using a coil and a magnet. In this case, a force in the rotational direction is applied to the mirror by the interaction between the magnetic field generated by passing a current through the coil and the magnetic field of the magnet, and as a result, the mirror is rotated (for example, from Patent Document 1). 3).
- Patent Documents 1 to 3 described above disclose a driving device in which a driven part is integrally supported by a base (or a frame) to which a driving force is applied.
- an object of the present invention is to provide a driving device capable of driving a driven part in a new manner, for example.
- the drive device includes a first base portion, a second base portion, an elastic portion that connects the first base portion and the second base portion, and a driveable aspect. 2 a driven part supported by the base part.
- FIG. 6 is a sectional view (No. 2) conceptually showing a mode of operation of the first base in the MEMS scanner according to the first example. It is a side view which shows notionally the aspect of operation
- the driving device includes a first base portion, a second base portion, an elastic portion that connects the first base portion and the second base portion, and a drivable manner to the second base portion. And a driven part to be supported.
- the first base portion and the second base portion are directly or indirectly coupled (in other words, connected) by an elastic portion (for example, a spring portion described later) having elasticity.
- an elastic portion for example, a spring portion described later
- the rigidity of the elastic part is lower than the rigidity of one or both of the first base part and the second base part due to the elasticity of the elastic part.
- the elastic portion is relatively easily deformed relative to both or one of the first base portion and the second base portion.
- both or one of the first base portion and the second base portion is relatively difficult to deform while the elastic portion is relatively easily deformed.
- the second base part supports the driven part.
- the second base portion supports the driven portion so that the driven portion can be driven (for example, rotatable or movable).
- the second base portion and the driven portion may be connected by an elastic portion having elasticity, so that the second base portion may support the first driven portion in a drivable manner.
- the drive device of this embodiment having such a configuration can suitably drive (eg, rotate or move) the driven part. That is, according to the driving apparatus of the present embodiment having such a configuration, the driven part can be suitably driven (for example, rotated or moved). Specifically, for example, when the first base portion moves, the second base portion connected to the first base portion via the elastic portion also moves along with the movement of the first base portion. . When the second base portion moves, the driven portion supported by the second base portion also moves along with the movement of the second base portion. As a result, the driven part can be driven suitably.
- the specific driving mode of the driven part described above is that two rigid bodies (that is, corresponding to the first base part and the second base part) are connected by one spring (that is, corresponding to the elastic part). It can be understood by thinking about the system.
- Such a system is considered to have a plurality of natural vibration modes and natural frequencies for each of the natural vibration modes.
- the one rigid body when a couple is applied to one rigid body at a frequency corresponding to a predetermined natural frequency, the one rigid body can be rotated. Then, the rotational motion of one rigid body is transmitted as a moment of inertia to the other rigid body via a spring. Therefore, a natural vibration mode corresponding to a predetermined natural frequency can be realized.
- the first base part and the second base part are structures other than the elastic part (for example, the first base part and the first base part and the first base part and the second base part are not elastic). 2 may be connected by a structure that does not have the property of being more easily deformable than the base portion. Even in this case, the driven part can be driven in accordance with the movement of the first base part.
- the driving device further includes a driving force applying unit that applies a driving force for driving the driven unit to the first base unit. Driven by the driving force transmitted from the first base part to the second base part via the elastic part.
- the first base portion moves due to the driving force applied to the first base portion.
- the second base part connected to the first base part also moves.
- the driven part also moves.
- the driven part can be suitably driven by the driving force applied to the first base part (that is, the driving force substantially transmitted from the first base part via the elastic part).
- the first base unit is moved in the first direction and the second direction different from the first direction by the driving force applied from the driving force application unit.
- the driven part is rotatable about the first direction and the first direction by the driving force transmitted from the first base part to the second base part via the elastic part. It may be rotatable about an axis along the second direction as a rotation axis.
- the driving force due to the rotation of the first base portion is caused by the elastic portion.
- the second base portion is transmitted to the second base portion, and the second base portion is also rotated about the axis along the first direction as the rotation axis.
- the driving force due to the rotation of the first base portion is transmitted to the second base portion by the elastic portion, and the second base portion The part is also rotated about the axis along the second direction as a rotation axis.
- the second base part is rotated by the rotation axis in the same direction as the rotation axis of the first base part. Therefore, if the rotation direction of the first base portion is changed, the rotation direction of the second base portion (in other words, the rotation direction of the driven portion) also changes. Therefore, the rotational direction of the driven part can be changed by changing the driving force applied to the first base part.
- the driving force application unit includes a coil disposed around the opening portion of the first base portion, and a yoke inserted through the opening portion of the first base portion. You may have.
- the first base portion is configured to have an opening portion.
- the first base portion is configured as a frame-like frame.
- a coil that functions as a part of the driving force application portion is disposed around the opening portion of the first base portion. The coil is wound, for example, so as to go around the opening.
- a yoke for focusing the magnetic flux is inserted through the opening of the first base portion.
- the yoke is preferably configured to include a soft magnetic material having a high relative permeability such as pure iron, permalloy, silicon iron, sendust, and the like.
- the distance between the yoke and the coil is small.
- the yoke is enlarged in a range that does not hinder driving of the first base portion on which the coil is arranged.
- the cross section of a yoke is a shape close
- the yoke is inserted, for example, from the lower side to the upper side of the first base portion.
- the yoke is configured to extend upward to some extent.
- a yoke is comprised long in the range which does not prevent the drive of the 1st base part in which the coil is arrange
- FIG. 1 is a plan view showing a configuration when the MEMS scanner 101 according to the first embodiment is viewed from the front side
- FIG. 2 is a view when the MEMS scanner 101 according to the first embodiment is viewed from the back side. It is a top view which shows the structure of these.
- FIG. 3 is a cross-sectional view showing a stacked structure of the MEMS scanner 101 according to the first embodiment.
- the MEMS scanner 101 includes a first base 110, a second base 120, a spring part 210, a wiring spring part 220, a coil 300, a mirror 400, and the like. And a torsion bar 450.
- the first base 110 has a frame shape with a void (opening) inside. That is, the first base 110 has two sides extending in the Y-axis direction in the drawing and two sides extending in the X-axis direction (that is, a direction orthogonal to the Y-axis direction) in the drawing, and Y It has a frame shape having a gap surrounded by two sides extending in the axial direction and two sides extending in the X-axis direction.
- the first base 110 has a square shape, but is not limited thereto.
- the first base 110 has other shapes (for example, a rectangular shape such as a rectangle). Or a circular shape or the like. Further, the first base 110 is not limited to a frame shape.
- the first base 110 is fixed to a substrate or support member (not shown) (in other words, fixed inside the system called the MEMS scanner 101). Alternatively, the first base 110 may be suspended by a suspension (not shown) or the like.
- the coil 300 is disposed on the first base 110.
- the coil 300 is a plurality of windings made of, for example, a material having relatively high conductivity (for example, gold, copper, etc.).
- the coil 300 has a square shape along the first base 110.
- the coil 300 may have any shape (for example, a rectangle, a rhombus, a parallelogram, a circle, an ellipse, or any other loop shape).
- the coil 300 is supplied with a control current from a power supply via a power supply terminal (not shown).
- the power source may be a power source provided in the MEMS scanner 101 itself, or may be a power source prepared outside the MEMS scanner 101.
- a magnet (not shown) is arranged around the coil 300, and a rotational force is applied by the interaction between the magnetic field generated by passing a control current through the coil 300 and the magnetic field of the magnet.
- the first base 110 provided with the coil 300 is rotated in a direction corresponding to the direction of the magnetic field and the control current.
- the coil 300 is a specific example of a “driving force applying unit”.
- the second base part 120 has a frame shape with a gap inside, like the first base part 110.
- a mirror 400 is disposed in the gap of the second base 120.
- the mirror 400 is arranged to be suspended or supported by the torsion bar 450.
- the torsion bar 450 is a member having elasticity such as a spring made of silicon, copper alloy, iron alloy, other metal, resin, or the like.
- the torsion bar 450 is arranged to extend in the Y-axis direction in FIG.
- the torsion bar 450 has a shape having a long side extending in the Y-axis direction and a short side extending in the X-axis direction.
- One end of the torsion bar 450 is connected to the second base 110.
- the other end of the torsion bar 450 is connected to the mirror 400. For this reason, the mirror 400 can be rotated about the axis along the Y-axis direction as a rotation axis by the elasticity of the torsion bar 120.
- the mirror 400 is a specific example of “driven part”.
- the first base 110 and the second base 120 are connected to each other by a spring portion 210.
- the spring part 210 is a specific example of the “elastic part” and has a function of transmitting the driving force obtained from the coil 300 in the first base 110 to the second base 120.
- a wiring spring part 220 is provided between the first base 110 and the second base 120.
- the wiring spring part 220 is provided to realize electrical connection between the first base 110 and the second base 120.
- a connection wiring 225 for connecting the coil 300 of the first base 110 and the wiring 500 of the second base 120 is arranged in the wiring spring part 220.
- the MEMS scanner 101 is configured by a laminated structure of a support layer 10, an active layer 20, a BOX layer 30, and a metal layer 40.
- a laminated structure including other layers may be employed.
- Each of the support layer 10 and the active layer 20 includes, for example, silicon.
- the BOX layer 30 is made of, for example, an oxide film such as SiO 2 and is disposed between the support layer 10 and the active layer 20.
- the BOX layer 30 insulates the support layer 10 and the active layer 20.
- the metal layer 40 includes, for example, a metal having high conductivity and is disposed on the active layer 20.
- the metal layer 40 constitutes the coil 300 in the first base 110, the wiring 500 in the second base 120, the connection wiring 225 in the wiring spring portion 220, and the like.
- the support layer 10 is formed to extend from the first base 110 to the spring portion 210 and the second base 120 (specifically, refer to FIG. 2). .
- the active layer 20, the BOX layer 30, and the metal layer 40 are formed on the first base 110 and the second base 120, but are not formed on the spring portion 210.
- the spring part 210 is constituted only by the support layer 20.
- the spring part 210 is configured integrally with the support layer 10 of the first base 110 and the support layer of the second base 120.
- the active layer 20 is not formed on the spring part 210, but the active layer 20 is formed on the wiring spring part 220 (see FIG. 1). For this reason, electrical connection between the first base 110 and the second base 120 can be realized.
- FIGS. 4 and 5 are cross-sectional views conceptually showing a mode of operation of the first base in the MEMS scanner 101 according to the first embodiment.
- FIG. 6 is a side view conceptually showing an operation mode of the MEMS scanner 101 according to the first embodiment.
- FIG. 4 and subsequent figures for convenience of explanation, detailed members constituting the MEMS scanner 101 described in FIG. 1 to FIG.
- a control current is supplied to the coil 300.
- the control current includes a current component (that is, a Y-axis drive control current) for rotating the first base 110 about the axis along the Y-axis direction as a rotation axis.
- a magnetic field in the X-axis minus direction is applied to the coil 300 by a magnet. Accordingly, a Lorentz force is generated in the coil 300 due to an electromagnetic interaction between the X-axis drive control current supplied to the coil 300 and the Y-axis drive magnetic field applied to the coil 300. Become.
- the Y-axis drive control current may be supplied to the coil 300 in the counterclockwise direction in FIG.
- the long side on the right side that is, the upper side in FIG. 1 of the two long sides of the coil 300 facing in the X-axis direction is shown in FIG.
- the Lorentz force toward the upper direction in is generated.
- the long side on the left side that is, the lower side in FIG. 1 of the two long sides of the coil 300 facing in the X-axis direction is shown in FIG.
- a Lorentz force in the downward direction in b) is generated.
- Lorentz forces in different directions are generated on the two long sides of the coil 300 facing each other along the X-axis direction.
- Lorentz force which is a couple, is generated on the two long sides of the coil 300 facing each other along the X-axis direction. Accordingly, the coil 300 rotates in the counterclockwise direction in FIG.
- the coil 300 rotates about the axis along the Y-axis direction as a rotation axis (more specifically, reciprocatingly drives to rotate).
- a control current including a current component (that is, an X-axis drive control current) for rotating the first base 110 about the axis along the X-axis direction as a rotation axis. Is supplied to the coil 300.
- a magnetic field in the Y-axis plus direction is applied to the coil 300 by a magnet. Accordingly, a Lorentz force is generated in the coil 300 due to electromagnetic interaction between the X-axis drive control current supplied to the coil 300 and the X-axis drive magnetic field applied to the coil 300. Become.
- the X-axis drive control current may be supplied to the coil 300 in the counterclockwise direction in FIG.
- the right long side of the two long sides of the coil 300 facing in the Y-axis direction is directed in the lower direction in FIG. 5B.
- Lorentz force is generated.
- the left long side of the two long sides of the coil 300 facing in the Y-axis direction has a Lorentz direction toward the upper side in FIG. Force is generated. That is, Lorentz forces in different directions are generated on the two long sides of the coil 300 facing each other along the Y-axis direction.
- Lorentz force which is a couple, is generated on the two long sides of the coil 300 facing each other along the Y-axis direction. Accordingly, the coil 300 rotates in the clockwise direction in FIG.
- the coil 300 rotates about the axis along the X-axis direction as a rotation axis (more specifically, reciprocatingly drives to rotate).
- the rotating operation of the coil 300 described above is transmitted from the first base 110 to the second base 120 via the spring portion 210.
- the second base 120 is driven. That is, the second base 120 is driven by the driving force applied to the coil 300 in the first base 110.
- the mirror 400 has the axis along the X-axis direction as the rotation axis. It is driven greatly in the rotation direction.
- the second base 120 rotates in the counterclockwise direction.
- the mirror 400 disposed on the second base 120 rotates significantly in the counterclockwise direction (that is, the same rotational direction as the second base 120).
- the mirror 400 disposed on the second base 120 rotates greatly in the clockwise direction (that is, a rotation direction different from that of the second base 120). Whether to rotate as shown in FIG. 6A or as shown in FIG. 6B can be selected depending on the design of the hardness of each spring.
- FIG. 7 is an enlarged cross-sectional view showing a configuration around the boundary of the support layer in the MEMS scanner according to the first comparative example.
- the driving force generated by the coil 300 of the first base 110 is transmitted to the mirror 400 of the second base 120 via the spring part 210. Therefore, as can be seen from FIG. 6, the spring portion 210 is greatly deformed by driving. Since the shape and hardness of the spring portion 210 greatly affect the mode of resonance mode of driving and its resonance frequency, it is desired to make the shape and hardness suitable for satisfying the required device characteristics. Further, it is desirable that the spring part 210 also satisfies the requirements regarding strength (for example, strength that does not break due to deformation due to driving, etc.).
- the spring portion 210 that does not have a certain strength or more may be damaged during driving around the boundary between the first base 110 and the second base 120.
- the support layer 10 is not integrally formed as shown in FIG. That is, unlike the present embodiment (see FIG. 3), the support layer 10 is not formed to extend from the first base 110 to the spring portion 210 and the second base 120, and the support layer is partially formed.
- the support layer 10 is not formed to extend from the first base 110 to the spring portion 210 and the second base 120, and the support layer is partially formed.
- the support layer 10 since the support layer 10 is not integrally formed, the boundary of the support layer 10 as shown in the figure exists. And in the boundary part of this support layer 10, a notch like the area
- the spring portion 210 where stress is likely to concentrate is formed by the same layer as the support layer 10 of the first base 110 and the second base 120. It is constructed integrally. Therefore, damage due to stress concentration as described above can be effectively prevented.
- the spring portion 210 is configured only by the support layer 10, and thus, for example, the support layer 10 and other layers (for example, the active layer 20).
- the stress at the time of driving is concentrated on the boundary portion with the BOX layer 30) and the spring portion 210 can be effectively prevented from being damaged.
- the spring part 210 is not formed of a single layer (for example, when the BOX layer 30 is included), the spring part 210 is the same layer as the support layer 10 of the first base 110 and the second base 120. As long as they are integrally configured, the effect of improving the damage resistance can be obtained accordingly.
- FIG. 8 is an enlarged plan view showing the configuration of the spring portion of the MEMS scanner according to the embodiment.
- the spring portion 210 of the MEMS scanner 101 includes a portion extending in the direction along the X-axis direction (hereinafter, referred to as “first portion” as appropriate) and a Y-axis direction. Each has a portion extending in the direction along which it follows (hereinafter referred to as “second portion” as appropriate). Specifically, a first portion is connected to each of the first base 110 and the second base 120, and a second portion is provided between the two first portions.
- the spring part 210 has the first part and the second part extending in different directions, the stress concentration can be reduced and the damage resistance can be effectively increased.
- the second portion extending in the direction crossing the connecting direction that is, the direction along the Y-axis direction
- the width L1 of the first portion described above is formed to be thicker than the width L2 of the second portion.
- the first portion extending in the coupling direction ie, the direction along the X-axis direction
- the second portion extending in the direction crossing the connecting direction that is, the direction along the Y-axis direction
- it becomes easier to bend, and the damage resistance can be effectively increased.
- a region where the active layer 20 does not partially exist is provided in a connection portion between the spring portion 210 and each of the first base 110 and the second base 120 (indicated by a broken line in the drawing). See enclosed area).
- a connection portion between the spring portion 210 and each of the first base 110 and the second base 120 indicated by a broken line in the drawing. See enclosed area).
- the spring portion 210 As described above, according to the spring portion 210 according to the present embodiment, it is possible to effectively suppress breakage during driving.
- FIG. 9 is an enlarged plan view showing the configuration of the spring part of the MEMS scanner according to the first modification
- FIG. 10 is an enlarged plan view showing the structure of the spring part of the MEMS scanner according to the second modification. is there.
- FIG. 11 is an enlarged plan view showing the configuration of the spring portion of the MEMS scanner according to the third modification.
- the spring portion 211 according to the first modification is formed so that the periphery of the connection portion between the first base 110 and the second base 120 in the first portion is thicker (in the drawing). (See the area enclosed by the dashed line). If comprised in this way, since the connection part in which stress tends to concentrate especially in the 1st part is formed thickly, damage resistance can be improved effectively.
- the spring portion 212 according to the second modification has two spring portions integrally formed. That is, in FIG. 1 and the like, when the MEMS scanner 101 is viewed in the direction along the X-axis direction, two spring portions arranged at contrasting positions are configured as one spring portion. Specifically, one first portion extending from the first base 110 and two first portions extending from the second base 120 are connected to each other by one second portion. Even if it is a case where it comprises in this way, the effect which improves damage tolerance can be acquired by making the 1st part and the 2nd part into the various structures mentioned above.
- the spring part 213 according to the third modification is configured in the same shape as the spring part 211 according to the first modification.
- the width L3 of the wiring spring portion 223 is configured to have a width L3 that is smaller than the width L2 of the second portion of the spring portion 213.
- the total length when the wiring spring portion 223 is extended is configured to be longer than the total length when the spring portion 213 is extended. According to such a structure, the hardness of the wiring spring part 223 can be made soft. Therefore, unlike the spring part 213, the damage resistance of the wiring spring part 223 comprised only by the active layer 20 can be improved effectively.
- FIG. 12 is a plan view showing the configuration of the MEMS scanner according to the second embodiment.
- FIG. 13 is a cross-sectional view showing the configuration of the MEMS scanner according to the second embodiment.
- the MEMS scanner 102 includes a yoke that is inserted into the opening of the first base 110 in addition to the configuration of the MEMS scanner 101 according to the first embodiment (for example, see FIG. 1). 600.
- the yoke 600 is preferably configured to include a soft magnetic material having a high relative permeability such as pure iron, permalloy, silicon iron, sendust, and the like.
- the yoke 600 is formed so as to extend from the lower yoke 650 disposed on the lower side of the MEMS scanner 101 to the upper side of the MEMS scanner 101.
- a first magnet 710 and a second magnet 720 that generate magnetic flux are disposed on the sides of the yoke 600.
- the first magnet 710 has an upper surface (that is, a surface facing the MEMS scanner 102) as an S pole
- the second magnet 720 has an upper surface as an N pole (that is, a pole different from the first magnet 710). ing. Therefore, the magnetic flux travels from the upper surface of the second magnet 720 to the upper surface of the first magnet 710.
- a middle yoke (not shown) may be provided on the upper surfaces of the first magnet 710 and the second magnet 720.
- a yoke post (not shown) may be provided outside the coil 300.
- the magnetic flux generated by the first magnet 710 and the second magnet 720 described above can be focused. Thereby, the Lorentz force generated by flowing the control current through the coil 300 can be increased. That is, according to the yoke 600, the driving force that can be applied to the first base 110 can be increased without increasing the size of the coil 300, the first magnet 710, and the second magnet 720. Therefore, the apparatus can be reduced in size.
- the distance L4 (see FIG. 12) between the yoke 600 and the coil 300 is small.
- the yoke 600 is enlarged in a range that does not hinder the driving of the first base 110 on which the coil 300 is disposed.
- the cross section of the yoke 600 is preferably a shape close to the shape of the opening of the first base 110.
- the yoke 600 is configured to extend to the upper side of the MEMS scanner 102 to some extent.
- the yoke 600 is preferably configured to be long in a range that does not hinder driving of the first base 110 on which the coil 300 is disposed, or in a range that does not hinder the path of laser light incident on the mirror 400.
- FIG. 14 is a plan view showing the configuration of the MEMS scanner according to the second comparative example.
- FIG. 15 is a cross-sectional view showing the configuration of the MEMS scanner according to the second comparative example.
- the mirror 400 is provided on the first base 110 on which the coil 300 is provided. More specifically, the mirror 400 according to the second comparative example is supported by the torsion bar 450 in the opening portion of the first base 110. According to such a configuration, when the first base 110 is driven by the driving force applied by the coil 300, the mirror 400 is also driven accordingly.
- the MEMS scanner 102 b according to the second comparative example has the mirror 400 disposed in the opening portion of the first base 110, so that the MEMS scanner 102 according to the second embodiment (see, for example, FIG. 13).
- the yoke 600 cannot be inserted. That is, in the MEMS scanner 102b according to the second comparative example, the yoke 600 can be extended only below the MEMS scanner 102b. Therefore, the MEMS scanner 102b according to the second comparative example is inferior in the magnetic flux focusing effect of the yoke 600 as compared with the MEMS scanner 102 according to the second embodiment.
- the MEMS scanner 102b when it is desired to apply a driving force equivalent to that of the MEMS scanner 102 according to the second embodiment, it is necessary to increase the size of the coil 300, the first magnet 710, and the second magnet 720. Is done.
- other magnetic flux generation means specifically, the third magnet 730, the fourth magnet 740, the first upper yoke 660, and the second upper yoke 670
- the third magnet 730, the fourth magnet 740, the first upper yoke 660, and the second upper yoke 670 are provided above the MEMS scanner 102b. It is required to be placed. Such a design change is difficult to avoid an increase in the size of the apparatus.
- the yoke 600 can be inserted through the opening portion of the first base 110, it is extremely effective while avoiding the enlargement of the apparatus.
- the magnetic flux focusing effect can be enhanced. Therefore, even when a device having a large driving force is required, the device can be downsized.
- a MEMS scanner 103 according to a third embodiment will be described with reference to FIGS.
- the third embodiment differs from the second embodiment described above only in part of the configuration and operation, and the other parts are substantially the same. For this reason, below, a different part from 2nd Embodiment is demonstrated in detail, and description shall be abbreviate
- FIG. 16 is a plan view showing the configuration of the MEMS scanner according to the third embodiment.
- the MEMS scanner 103 is provided with a third base 130 on the side opposite to the first base 110 when viewed from the second base 120.
- the third base 130 is provided with a coil 300b, and a yoke 600b is inserted through the opening.
- the third base 130 is physically connected to the second base 120 by a spring portion 210b and a wiring spring portion 220b, and is also electrically connected by a connection wiring 225b provided on the wiring spring portion 220b. . That is, the third base 130 is configured to transmit a driving force to the mirror 400 supported by the second base 120, similarly to the first base 110.
- FIG. 17 is a side view conceptually showing an operation mode of the MEMS scanner according to the third example.
- FIG. 17 for convenience of explanation, detailed members constituting the MEMS scanner 103 illustrated in FIG. 16 are simply omitted with appropriate illustration.
- a downward Lorentz force is generated around the right end of the first base 110
- an upward Lorentz force is generated around the left end
- a downward Lorentz force is generated around the right end of the third base 130.
- the mirror 400 can be rotated in a desired direction by generating Lorentz force in each of the first base 110 and the third base 130.
- a Lorentz force is generated in each of the coil 300 provided in the first base 110 and the coil 300b provided in the third base 130, and thus the MEMS according to the first embodiment.
- a large driving force can be obtained.
- the magnetic flux can be effectively focused by inserting the yoke 600b through the opening. Therefore, it can suppress that an apparatus enlarges.
- the MEMS scanners 101, 102, and 103 are, for example, for various electronic devices such as a head-up display, a head-mounted display, a laser scanner, a laser printer, and a scanning drive device. Can be applied. Therefore, these electronic devices are also included in the scope of the present invention.
- the present invention can be appropriately changed without departing from the gist or concept of the present invention that can be read from the claims and the entire specification, and a drive device that includes such a change is also included in the technical concept of the present invention. It is.
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Abstract
Description
本実施形態の駆動装置は、第1ベース部と、第2ベース部と、前記第1ベース部と前記第2ベース部とを連結する弾性部と、駆動可能な態様で前記第2ベース部に支持される被駆動部とを備える。
本実施形態の駆動装置の他の態様では、前記第1ベース部に対して、前記被駆動部を駆動させるための駆動力を付与する駆動力付与部を更に備え、前記被駆動部は、前記第1ベース部から前記弾性部を介して前記第2ベース部に伝達される駆動力により駆動する。
上述の如く駆動力付与部を備える態様では、前記第1ベース部は、前記駆動力付与部から付与される駆動力により、第1の方向及び該第1の方向とは異なる第2の方向に沿った軸を回転軸として回転可能であり、前記被駆動部は、前記第1ベース部から前記弾性部を介して前記第2ベース部に伝達される駆動力により、前記第1の方向及び前記第2の方向に沿った軸を回転軸として回転可能であってもよい。
或いは駆動力付与部を備える態様では、前記駆動力付与部は、前記第1ベース部の開孔部の周囲に配置されたコイルと、前記第1ベース部の開孔部に挿通されたヨークとを有してもよい。
先ず、第1実施例に係るMEMSスキャナ101について、図1から図11を参照して説明する。
初めに、図1から図3を参照して、第1実施例に係るMEMSスキャナ101の構成について説明する。ここに、図1は、第1実施例に係るMEMSスキャナ101を表側から見た場合の構成を示す平面図であり、図2は、第1実施例に係るMEMSスキャナ101を裏側から見た場合の構成を示す平面図である。また図3は、第1実施例に係るMEMSスキャナ101の積層構造を示す断面図である。
次に、図4から図6を参照して、本実施例に係るMEMSスキャナ101の動作について説明する。ここに図4及び図5は夫々、第1実施例に係るMEMSスキャナ101における第1ベースの動作の態様を概念的に示す断面図である。また図6は、第1実施例に係るMEMSスキャナ101の動作の態様を概念的に示す側面図である。なお、図4以降の図では、説明の便宜上、図1から図3等に記載したMEMSスキャナ101を構成する詳細な部材について、適宜省略して簡略的に図示している。
次に、既出の図6に加えて図7を参照して、MEMSスキャナの駆動時に発生し得る問題点について説明する。ここに図7は、第1比較例に係るMEMSスキャナにおける支持層の境界周辺の構成を示す拡大断面図である。
次に、図8を参照して、本実施例に係るバネ部210の具体的な構成について詳細に説明する。ここに図8は、実施例に係るMEMSスキャナのバネ部の構成を示す拡大平面図である。
次に、第2実施例に係るMEMSスキャナ102について、図12から図15を参照して説明する。尚、第2実施例は、上述した第1実施例と比べて一部の構成が異なるのみであり、その他の構成については概ね同様である。このため、以下では第1実施形態と異なる部分について詳細に説明し、他の重複する部分については適宜説明を省略するものとする。
先ず、第2実施例に係るMEMSスキャナ102の構成について、図12及び図13を参照して説明する。ここに図12は、第2実施例に係るMEMSスキャナの構成を示す平面図である。また図13は、第2実施例に係るMEMSスキャナの構成を示す断面図である。
次に、図14及び図15を参照して説明する第2比較例に係るMEMSスキャナ102bとの比較により、第2実施例に係るMEMSスキャナ102の有利な点について具体的に説明する。ここに図14は、第2比較例に係るMEMSスキャナの構成を示す平面図である。また図15は、第2比較例に係るMEMSスキャナの構成を示す断面図である。
次に、第3実施例に係るMEMSスキャナ103について、図6及び図7を参照して説明する。尚、第3実施例は、上述した第2実施例と比べて一部の構成及び動作が異なるのみであり、その他の部分については概ね同様である。このため、以下では第2実施形態と異なる部分について詳細に説明し、他の重複する部分については適宜説明を省略するものとする。
先ず第3実施形態に係るMEMSスキャナ103の構成について、図16を参照して説明する。ここに図16は、第3実施例に係るMEMSスキャナの構成を示す平面図である。
次に、図17を参照して、第3実施例に係るMEMSスキャナ103の動作について説明する。ここに図17は、第3実施例に係るMEMSスキャナの動作の態様を概念的に示す側面図である。なお、図17では、説明の便宜上、図16に記載したMEMSスキャナ103を構成する詳細な部材について、適宜省略して簡略的に図示している。
20 活性層
30 BOX層
40 金属層
101,102,103 MEMSスキャナ
110 第1ベース
120 第2ベース
130 第3ベース
210 バネ部
220 配線バネ部
225 接続配線
300 コイル
400 ミラー
450 トーションバー
500 配線
600 ヨーク
650 下部ヨーク
660 第1上部ヨーク
670 第2上部ヨーク
710 第1磁石
720 第2磁石
730 第3磁石
740 第4磁石
Claims (4)
- 第1ベース部と、
第2ベース部と、
前記第1ベース部と前記第2ベース部とを連結する弾性部と、
駆動可能な態様で前記第2ベース部に支持される被駆動部と
を備えることを特徴とする駆動装置。 - 前記第1ベース部に対して、前記被駆動部を駆動させるための駆動力を付与する駆動力付与部を更に備え、
前記被駆動部は、前記第1ベース部から前記弾性部を介して前記第2ベース部に伝達される駆動力により駆動する
ことを特徴とする請求項1に記載の駆動装置。 - 前記第1ベース部は、前記駆動力付与部から付与される駆動力により、第1の方向及び該第1の方向とは異なる第2の方向に沿った軸を回転軸として回転可能であり、
前記被駆動部は、前記第1ベース部から前記弾性部を介して前記第2ベース部に伝達される駆動力により、前記第1の方向及び前記第2の方向に沿った軸を回転軸として回転可能である
ことを特徴とする請求項2に記載の駆動装置。 - 前記駆動力付与部は、
前記第1ベース部の開孔部の周囲に配置されたコイルと、
前記第1ベース部の開孔部に挿通されたヨークと
を有することを特徴とする請求項2又は3に記載の駆動装置。
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US20160122178A1 (en) | 2016-05-05 |
JPWO2014192193A1 (ja) | 2017-02-23 |
EP3006395A1 (en) | 2016-04-13 |
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JP2019091048A (ja) | 2019-06-13 |
JP6805225B2 (ja) | 2020-12-23 |
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