Source: https://patents.google.com/patent/JP2011141333A/en
Timestamp: 2020-04-04 09:17:55
Document Index: 630241728

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JP2011141333A - Oscillation mirror element - Google Patents
Oscillation mirror element Download PDF
JP2011141333A
JP2011141333A JP2010000693A JP2010000693A JP2011141333A JP 2011141333 A JP2011141333 A JP 2011141333A JP 2010000693 A JP2010000693 A JP 2010000693A JP 2010000693 A JP2010000693 A JP 2010000693A JP 2011141333 A JP2011141333 A JP 2011141333A
JP2010000693A
Isaku Jinno
Hidetoshi Kodera
尚樹 井上
秀俊 小寺
学 村山
伊策 神野
2010-01-05 Application filed by Funai Electric Co Ltd, Kyoto Univ, 国立大学法人京都大学, 船井電機株式会社 filed Critical Funai Electric Co Ltd
2010-01-05 Priority to JP2010000693A priority Critical patent/JP2011141333A/en
2011-07-21 Publication of JP2011141333A publication Critical patent/JP2011141333A/en
<P>PROBLEM TO BE SOLVED: To provide an oscillation mirror element, in which elongation in the first direction (Y direction) can be suppressed and the tilt of a mirror section in a non-driving state can be suppressed. <P>SOLUTION: This oscillation mirror element 100 includes a linearly extending cantilever-like drive section 41 including an end (fixed end) 41a formed on the Y1 side and an end (free end) 41b formed on the Y2 side, a mirror support 46 capable of supporting an optical scan section 10 of the X direction in an inclined state thereof, a linearly extending cantilever-like drive section 51 that includes an end (fixed end) 51a formed on the Y2 side and an end (free end) 51b formed on the Y1 side and has a substantially point-symmetrical relationship with the drive section 41 using, as the symmetric point, the center R3 of the optical scan section 10 (mirror 11) of the X direction, and a mirror support 56 that has a substantially point-symmetric relation with the mirror support 46 using the center R3 as the symmetric point and supports the optical scan section 10 of the X direction in a tilted state thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT
The present invention relates to a vibrating mirror element, and more particularly to a vibrating mirror element provided with a drive unit.
Conventionally, a vibrating mirror element including a drive unit is known (see, for example, Patent Documents 1 and 2).
In Patent Document 1, a pair of drive units arranged along the X direction and a mirror unit arranged so as to be sandwiched between the pair of drive units in the X direction and rotated by the pair of drive units. And an optical deflector including a pair of drive units and a support unit disposed so as to surround the mirror unit along the X direction and the Y direction (a direction orthogonal to the X direction in the same plane). . One end of each of the pair of driving units is connected to the mirror unit on one side and the other side in the X direction. In addition, the other end of each of the pair of drive units is fixed by a support unit located on the opposite side of the mirror unit in the X direction. In addition, each of the pair of driving units is arranged in a state where a plurality of individual piezoelectric actuators extending in the Y direction are arranged in the X direction, and continuously in a state of being folded back from each other at each end of the plurality of piezoelectric actuators. Connected. Note that one end of the pair of drive units of the optical deflector is connected to the mirror unit at one corner in the Y direction of the mirror unit, and the other end of the pair of drive units is both The support portion is connected to the support portion at one corner in the Y direction of the support portion.
Further, in Patent Document 2, a horizontal drive unit, a pair of first cantilevers (cantilever beams) disposed on one side in the X direction of the horizontal drive unit and extending in the X direction, and the X direction of the horizontal drive unit are arranged. A pair of second cantilevers disposed on the other side and extending in the X direction, a pair of first connectors for connecting each of the pair of first cantilevers and the horizontal drive unit, and each of the pair of second cantilevers and the horizontal drive unit There is disclosed a biaxial microscanner comprising a pair of second connectors for connecting the two and the second connector, and a frame disposed so as to surround all the above-described configurations along the X direction and the Y direction. The pair of first cantilevers and the pair of second cantilevers of the biaxial microscanner are fixed to the frame on the opposite sides of the first connector and the second connector in the X direction, respectively. One of the pair of first cantilevers and one of the pair of second cantilevers are both disposed on a first straight line extending in the X direction, and the other of the pair of first cantilevers and the other of the pair of second cantilevers. Are arranged on a second straight line extending in the X direction.
JP 2009-169290 A JP 2007-188073 A
However, in the optical deflector described in Patent Document 1, the one end portion and the other end portion of the pair of drive portions are both offset to one side in the Y direction with respect to the center of the mirror portion (the corners of the mirror portion). In the state where the pair of driving units are not driven (non-driving state), the mirror unit is caused by the weight of the mirror unit in the X direction. There is a problem that it is inclined so that the other side is positioned below the one side.
In the biaxial microscanner described in Patent Document 2, one of the pair of first cantilevers and one of the pair of second cantilevers are both disposed on the first straight line extending in the X direction, and the pair of first cantilevers. Since the other of the one cantilever and the other of the pair of second cantilevers are both arranged on the second straight line extending in the X direction, the X direction of the pair of first cantilevers and the pair of second cantilevers is improved in order to improve driving force. When the length of the two-axis microscanner is increased in the X direction (first direction), the total length of the pair of first cantilevers and the pair of second cantilevers is increased. There is a point.
The present invention has been made to solve the above-described problems, and one object of the present invention is to suppress the lengthening in the first direction and to tilt the mirror portion in the non-driven state. It is an object of the present invention to provide a vibrating mirror element capable of suppressing the above.
A vibrating mirror element according to one aspect of the present invention includes a mirror portion, a first fixed end formed on one side in the first direction rather than one end portion on one side in the first direction of the mirror portion, A first free end formed on the other side in the first direction than the other end on the other side in the first direction, extending linearly along the first direction, and having a deformable cantilever shape A first drive unit, a first mirror support unit capable of supporting the mirror unit in a tilted state according to the tilt on the first free end side during driving, and the other of the other side of the mirror unit in the first direction A second fixed end formed on the other side in the first direction from the end, and a second free end formed on the one side in the first direction from the one end on the one side in the first direction of the mirror unit; And has a substantially point-symmetrical relationship with the first drive unit with the center of the mirror unit as the symmetry point, and a straight line along the first direction And a deformable cantilever-shaped second drive part, and a substantially point-symmetrical relationship with the first mirror support part with respect to the center of the mirror part, and an inclination on the second free end side during driving And a second mirror support portion capable of supporting the mirror portion in a tilted state.
In the vibrating mirror element according to one aspect of the present invention, as described above, the second drive unit has a substantially point-symmetrical relationship with the first drive unit with the center of the mirror unit as a symmetric point, and the second mirror support unit is The first drive unit and the second drive having a substantially point-symmetrical arrangement in a plan view by configuring the mirror unit so as to have a substantially point-symmetrical relationship with the first mirror support unit with the center of the mirror unit as a symmetric point. The mirror portion can be supported by the first mirror support portion and the second mirror support portion that are in a substantially point-symmetric arrangement relationship. Thereby, since the weight of the mirror part can be evenly distributed to the first mirror support part and the second mirror support part, the mirror part can be prevented from being inclined in the non-driven state. Further, when residual stress is accumulated in the first drive unit and the second drive unit, the first drive unit and the second drive unit are in a substantially point-symmetric arrangement relationship, thereby canceling out the mutual residual stress. Therefore, it is possible to suppress the tilting of the mirror portion in the non-driven state.
In the vibrating mirror element according to the aforementioned aspect, the first fixed end of the first drive unit extending linearly along the first direction is in the first direction than the one end portion on one side in the first direction of the mirror unit. The first free end is formed on the other side of the first direction with respect to the other end portion on the other side in the first direction of the mirror part, and extends in a straight line along the first direction. The second fixed end of the drive unit is formed on the other side in the first direction relative to the other end on the other side in the first direction of the mirror unit, and the second free end is one end on the one side in the first direction of the mirror unit. By forming on one side of the first direction from the part, both the first drive unit and the second drive unit can be formed to extend from one side of the mirror unit in the first direction toward the other side. . That is, the first drive unit and the second drive unit are moved in the second direction so that the mirror unit is sandwiched in a direction (second direction) orthogonal to the first direction by the first drive unit and the second drive unit. Can be placed side by side. Thereby, since the first drive unit and the second drive unit are not arranged on a common straight line extending in the first direction, the length of each of the first drive unit and the second drive unit in the first direction is increased. Even in this case, the entire oscillating mirror element does not become longer in the first direction by the sum of the increased lengths of the first drive unit and the second drive unit. As a result, the size of the oscillating mirror element can be suppressed from becoming longer in the first direction.
In the oscillating mirror element according to the one aspect described above, preferably, residual stress is accumulated in the first driving unit and the second driving unit, and the residual stress of the first driving unit and the center of the mirror unit are used as symmetry points. By canceling the residual stress of the second driving unit having a substantially point-symmetrical relationship with the first driving unit, the mirror unit is in the non-driving state of the first driving unit and the second driving unit. The first fixed end of the second drive unit and the second fixed end of the second drive unit are disposed substantially parallel to the plane. If comprised in this way, even if it is a case where residual stress is accumulate | stored in the 1st drive part and the 2nd drive part easily, in the non-drive state, the 1st fixed end of the 1st drive part and the 2nd It can suppress that a mirror part inclines with respect to the plane which passes along the 2nd fixed end of a drive part.
In the vibrating mirror element according to the aforementioned aspect, preferably, the first drive unit further includes a first connection part formed on the first free end side, and the second drive part is formed on the second free end side. The first mirror support portion is configured to be able to support the mirror portion in an inclined state in accordance with the inclination of the first connection portion, and the second mirror. The support portion is configured to be able to support the mirror portion in an inclined state according to the inclination in the second connection portion. If comprised in this way, while the 1st mirror support part can support a mirror part in the state which maintained the inclination in the 1st connection part at least, a 2nd mirror support part is an inclination in a 2nd connection part at least The mirror portion can be supported while maintaining the above.
In the vibrating mirror element according to the above aspect, preferably, the first mirror support unit, the second mirror support unit, and the mirror unit are in an inclined state when driven while deforming the first drive unit and the second drive unit. It is comprised so that it may be located on substantially the same plane. If comprised in this way, the inclination of the 1st mirror support part inclined according to the inclination of a 1st drive part, and the inclination of the 2nd mirror support part inclined according to the inclination of a 2nd drive part, The mirror portion can be stably tilted in a state in which the tilt of the mirror portion is maintained substantially the same.
In the vibrating mirror element according to the above aspect, preferably, the first drive unit and the second drive unit are configured to be driven by applying a voltage, and the first drive unit and the second drive unit are connected to each other. Are configured such that voltages having phases opposite to each other are applied. If comprised in this way, in a 1st drive part and a 2nd drive part, the deformation | transformation which warps in a mutually different direction can be easily made. Accordingly, the first free end side of the first drive unit and the second free end side of the second drive unit are configured to be displaced to the same extent on opposite sides with respect to the position in the non-drive state. it can. As a result, the first mirror support portion that is tilted according to the tilt of the first drive portion on the first free end side has a substantially point-symmetrical relationship with the first mirror support portion, and the second drive portion has the second free end. The second mirror support portion that is inclined according to the inclination on the end side can be inclined at substantially the same inclination angle. Therefore, the mirror part supported by the first mirror support part and the second mirror support part can be inclined in a predetermined direction.
In the oscillating mirror element according to the above aspect, it is preferable that the oscillating mirror element is disposed between the first drive unit and the first mirror support unit, extends linearly along the first direction, and is deformable. The number of drive units and the same number as the third drive units, the first support unit disposed between the first drive unit and the first mirror support unit, extending linearly along the first direction and tiltable. And a substantially point-symmetrical relationship with the third drive unit with the center of the mirror unit as a symmetric point, and is arranged between the second drive unit and the second mirror support unit and linearly along the first direction. The fourth drive unit that extends and is deformable has a substantially point-symmetrical relationship with the first support unit with respect to the center of the mirror unit, and is disposed between the second drive unit and the second mirror support unit. The second support portion that extends linearly along the first direction and is tiltable Provided. If comprised in this way, since the whole oscillating mirror element further provided with a 3rd drive part, a 1st support part, a 4th drive part, and a 2nd support part can be comprised so that it may become substantially point symmetrical, 1st The mirror portion can be supported substantially evenly by the mirror support portion and the second mirror support portion having a substantially point-symmetrical relationship with the first mirror support portion with the center of the mirror portion as a symmetry point. Further, by driving the third drive unit and the fourth drive unit in addition to the first drive unit and the second drive unit, the mirror unit can be tilted with a larger tilt angle during driving.
In this case, it is preferable that the third drive unit and the first support unit are a third drive unit and a third drive unit from the first mirror support unit side toward the first drive unit side along a second direction orthogonal to the first direction. In a state where the first support portions are arranged so as to be alternately arranged, adjacent ones are sequentially connected to be alternately folded back on one side or the other side in the first direction. The fourth drive unit and the second support unit are continuously connected from the first mirror support unit to the first drive unit, and the fourth drive unit and the second support unit are arranged along the second direction from the second mirror support unit side to the second drive unit side. In the state where the fourth drive unit and the second support unit are alternately arranged toward the side, adjacent ones are alternately folded back on one side in the first direction and the other side in turn. The second drive from the second mirror support part It is continuously connected to. If comprised in this way, while being able to drive a 3rd drive part based on the displacement in the connection part of a 1st drive part and a 1st support part, while connecting a 2nd drive part and a 2nd support part Since the fourth drive unit can be driven based on the displacement in the portion, the inclination angle in the first mirror support unit and the second mirror support unit can be further increased. Thereby, the inclination angle of a mirror part can be enlarged more.
In the vibrating mirror element including the third drive unit, the first support unit, the fourth drive unit, and the second support unit, preferably, the first drive unit includes a first connection unit formed on the first free end side. In addition, the second drive unit further includes a second connection portion formed on the second free end side, and the third drive unit is an adjacent first support unit or first mirror on the mirror unit side in the second direction. Including a third connecting part connected to the support part, and the fourth driving part includes a fourth connecting part connected to the adjacent second support part or the second mirror support part on the mirror part side in the second direction, The first drive unit is configured to be connected to the adjacent first support unit at the first connection unit, and the second drive unit is configured to be connected to the adjacent second support unit at the second connection unit. The inclination angle of the first mirror support part with respect to the tangent to the first fixed end of the first drive part is the first drive part. The inclination angle of the first connection portion with respect to the tangent line of the first fixed end and the inclination angle of the third connection portion of the third drive portion with respect to the adjacent first support portion located on the first drive portion side in the second direction. The tilt angle of the second mirror support part with respect to the tangent line of the second fixed end of the second drive unit is the sum of the tilt angle of the second connection part with respect to the tangent line of the second fixed end of the second drive unit and the second It is a substantially total with the inclination angle of the 4th connection part of the 4th drive part to the adjacent 2nd support part located in the 2nd drive part side of a direction. If comprised in this way, the inclination angle of the 1st mirror support part with respect to the tangent of a 1st fixed end is made into the inclination angle which substantially match | combined the inclination angle based on a 1st drive part, and the inclination angle based on a 3rd drive part. In addition, the inclination angle of the second mirror support portion with respect to the tangent line of the second fixed end can be set to an inclination angle obtained by substantially combining the inclination angle based on the second drive portion and the inclination angle based on the fourth drive portion. Since it can do, the inclination-angle in a 1st mirror support part and a 2nd mirror support part can be enlarged further. Thereby, the inclination angle of the mirror portion can be further increased.
In the oscillating mirror element according to the above aspect, the mirror unit is preferably configured to rotate around the first rotation center, and the mirror unit is configured to perform the first rotation in the in-plane direction of the mirror and the mirror. A fifth drive unit that rotates the mirror around a second rotation center that is orthogonal to the movement center. With this configuration, it is possible to obtain a vibrating mirror element that can accurately reflect light around the first rotation center in the mirror and can scan light two-dimensionally.
In this case, preferably, the first drive unit and the second drive unit are configured to rotate the mirror unit around the first rotation center based on the first frequency, and the fifth drive unit includes: The mirror is configured to rotate around the second rotation center based on a second frequency that is higher than the first frequency. With this configuration, it is possible to scan light two-dimensionally in a state where the mirror unit is configured to rotate at a higher frequency around the second rotation center than around the first rotation center.
In the vibrating mirror element according to the above aspect, preferably, the first drive unit, the first mirror support unit, the second drive unit, the second mirror support unit, and the mirror unit are integrally formed. If comprised in this way, since it is not necessary to perform a mutual connection separately, the manufacturing process of a vibrating mirror element can be shortened.
In the vibrating mirror element according to the above aspect, the first drive unit and the second drive unit are preferably each a drive part having an electrode, an insulating layer having a contact hole formed on the surface of the drive part, And a wiring portion formed to extend on the surface of the insulating layer and connected to the electrode of the driving portion through the contact hole. If comprised in this way, a voltage can be easily applied to the electrode of the drive part of a 1st drive part and a 2nd drive part via a wiring part and a contact hole.
It is the perspective view which showed the structure of the vibration mirror element by one Embodiment of this invention. It is the top view which showed the structure of the vibration mirror element by one Embodiment of this invention. FIG. 3 is a side view of the oscillating mirror element shown in FIG. 2 as viewed from the E direction (F direction). FIG. 3 is an enlarged sectional view taken along line 1000-1000 of the vibrating mirror element shown in FIG. FIG. 3 is an enlarged cross-sectional view of the oscillating mirror element shown in FIG. 2 taken along line 2000-2000. FIG. 3 is an enlarged cross-sectional view of the oscillating mirror element shown in FIG. 2 taken along line 3000-3000. FIG. 4 is an enlarged cross-sectional view of the oscillating mirror element shown in FIG. 2 taken along line 4000-4000. FIG. 3 is an enlarged cross-sectional view of the oscillating mirror element shown in FIG. 2 taken along the line 5000-5000. It is an expanded sectional view showing the neighborhood of a piezoelectric actuator of a vibration mirror element by one embodiment of the present invention. It is the perspective view which showed the state in which the vibration mirror element by one Embodiment of this invention incline with the predetermined | prescribed inclination | tilt angle to the B1 side. It is the side view which showed the state in which the vibration mirror element by one Embodiment of this invention inclined with the predetermined | prescribed inclination angle. It is the side view which showed the state in which the vibration mirror element by one Embodiment of this invention inclined with the predetermined | prescribed inclination angle. It is the perspective view which showed the state in which the vibration mirror element by one Embodiment of this invention incline with the predetermined | prescribed inclination | tilt angle to the B2 side. It is sectional drawing which showed the manufacturing process of the vibration mirror element by one Embodiment of this invention. It is sectional drawing which showed the manufacturing process of the vibration mirror element by one Embodiment of this invention. FIG. 6 is a plan view showing a structure of a vibrating mirror element according to a first modification of an embodiment of the present invention. It is an expanded sectional view showing the structure of the drive part of the Y direction light scanning part of the vibration mirror element by the 2nd modification of one embodiment of the present invention. It is the expanded sectional view which showed the structure of the support part of the Y direction optical scanning part of a vibrating mirror element by the 2nd modification of one Embodiment of this invention, and a mirror support part. It is sectional drawing which showed the connection part by the side of Y2 of the vibration mirror element by the 2nd modification of one Embodiment of this invention. It is sectional drawing which showed the connection part by the side of Y1 of the vibration mirror element by the 2nd modification of one Embodiment of this invention.
First, with reference to FIGS. 1-9, the structure of the vibration mirror element 100 by one Embodiment of this invention is demonstrated.
As shown in FIGS. 1 to 3, the vibrating mirror element 100 according to an embodiment of the present invention includes an X-direction optical scanning unit 10 for scanning light in the X direction using a mirror 11 described later, and a mirror 11. And a Y-direction optical scanning unit 30 for scanning light in the Y direction orthogonal to the X direction. Further, as shown in FIGS. 4 to 8, the X direction light scanning unit 10 and the Y direction light scanning unit 30 are integrally formed on a common Si substrate 1 having a thickness t1 of about 0.1 mm. . The X-direction optical scanning unit 10 is an example of the “mirror unit” in the present invention.
The oscillating mirror element 100 is incorporated in a device that scans light such as a projector (not shown), scans light in the X direction by the X direction light scanning unit 10, and emits light in the Y direction by the Y direction light scanning unit 30. It is configured to scan. The X-direction optical scanning unit 10 is configured to be resonantly driven at a resonance frequency of about 30 kHz, while the Y-direction optical scanning unit 30 is configured to be non-resonantly driven at a frequency of about 60 Hz. . Here, by configuring the Y-direction optical scanning unit 30 to be non-resonantly driven, there is no change in the resonance frequency due to a change in the temperature around the vibrating mirror element 100. It is possible to drive. The resonance frequency of about 30 kHz is an example of the “second frequency” in the present invention, and the frequency of about 60 Hz is an example of the “first frequency” in the present invention.
As shown in FIGS. 4 and 8, the X-direction optical scanning unit 10 and the Y-direction optical scanning unit 30 excluding the frame 20 described later have a thickness t1 of about 0.1 mm in the Z direction, while the frame The body 20 has a thickness t2 of about 0.5 mm that is larger than t1. The frame 20 is formed on the Si substrate 1 having a thickness t1 of about 0.1 mm, the thin SiO 2 layer 2 formed on the lower surface (Z2 side) of the Si substrate 1, and the lower surface of the SiO 2 layer 2. And a lower Si layer 3 having a thickness of about 0.4 mm.
As shown in FIGS. 1 and 2, the X-direction optical scanning unit 10 is connected to the mirror 11, the torsion bars 12 and 13 that are connected to the mirror 11, and torsionally deformable, and torsion bars 12. , A tiltable bar 15 connected to the torsion bar 13, inner drive parts 16 and 17 connected to the bars 14 and 15, and fixing parts 18 and 19 for fixing the inner drive parts 16 and 17. The frame 20 is included. As shown in FIG. 2, the frame 20 (X-direction optical scanning unit 10) has a length L1 of about 5 mm in the Y direction and a length L2 of about 4 mm in the X direction. The inner drive units 16 and 17 are examples of the “fifth drive unit” in the present invention.
Further, the mirror 11 and the torsion bars 12 and 13 are configured to be inclined more than the inclination angle of the bars 14 and 15 by resonance. Further, the rotation center R1 when the oscillating mirror element 100 scans light in the X direction and the rotation center R2 when scanning light in the Y direction are both configured to pass through the center R3 of the mirror 11. . The center R3 of the mirror 11 is configured to be positioned at the center in the X direction and the Y direction of the X direction optical scanning unit 10. The rotation center R1 is an example of the “second rotation center” in the present invention, and the rotation center R2 is an example of the “first rotation center” in the present invention. The Y direction is an example of the “first direction” in the present invention, and the X direction is an example of the “second direction” in the present invention.
Further, as shown in FIG. 1, the inner drive units 16 and 17 are configured to be deformed into a concave shape or a convex shape in the Z direction, with the fixed portions 18 and 19 being fixed ends, respectively. The inner drive unit 16 and the inner drive unit 17 are deformed in directions opposite to each other so that the mirror 11 can be tilted in the A1 direction or the A2 direction around the rotation center R1 (see FIG. 2). Has been. Further, by repeating this deformation operation, the X-direction optical scanning unit 10 is configured to cause the mirror 11 to vibrate in the A direction around the rotation center R1 and to scan light in the X direction. The detailed structure of the inner drive units 16 and 17 will be described later.
In addition, as shown in FIG. 2, the Y-direction optical scanning unit 30 includes a driving unit 40 formed on the X1 side of the X-directional optical scanning unit 10 and a driving unit formed on the X2 side of the X-directional optical scanning unit 10. 50. That is, the drive unit 40 and the drive unit 50 are arranged so as to sandwich the X-direction optical scanning unit 10 in the X direction.
Here, in the present embodiment, in the drive unit 40, the drive unit 41, the support unit 42, the drive unit 43, the support unit 44, the drive unit 45, and the mirror support unit from the X1 side to the X2 side along the X direction. 46 are arranged in this order. In the drive unit 50, the drive unit 51, the support unit 52, the drive unit 53, the support unit 54, the drive unit 55, and the mirror support unit 56 are arranged in this order from the X2 side to the X1 side along the X direction. Are arranged. The drive unit 41, the support unit 42, the drive unit 43, the support unit 44, the drive unit 45, and the mirror support unit 46 are formed so as to extend linearly in the Y direction, and the drive unit 51 and the support unit 52. The drive unit 53, the support unit 54, the drive unit 55, and the mirror support unit 56 are formed to extend linearly in the Y direction. The drive unit 41 is an example of the “first drive unit” in the present invention, and the drive unit 51 is an example of the “second drive unit” in the present invention. The mirror support 46 is an example of the “first mirror support” in the present invention, and the mirror support 56 is an example of the “second mirror support” in the present invention. The support portions 42 and 44 are examples of the “first support portion” of the present invention, and the support portions 52 and 54 are examples of the “second support portion” of the present invention. The drive units 43 and 45 are examples of the “third drive unit” of the present invention, and the drive units 53 and 55 are examples of the “fourth drive unit” of the present invention.
Further, in the present embodiment, as shown in FIG. 2, the drive unit 40 and the drive unit 50 are configured to have a substantially point-symmetric relationship with respect to the center R <b> 3 of the mirror 11. That is, the drive unit 51, the support unit 52, the drive unit 53, the support unit 54, the drive unit 55, and the mirror support unit 56 of the drive unit 50 are rotated by 180 degrees about the center R3 of the mirror 11, respectively. The drive unit 40 is disposed in a positional relationship so as to substantially overlap the drive unit 41, the support unit 42, the drive unit 43, the support unit 44, the drive unit 45, and the mirror support unit 46. The specific arrangement of the drive unit 40 and the drive unit 50 will be described later.
Residual stress is accumulated in both the drive unit 40 (drive units 41, 43, and 45) and the drive unit 50 (drive units 51, 53, and 55). Here, in the present embodiment, the residual stress of the drive unit 40 and the residual stress of the drive unit 50 are such that the drive unit 40 and the drive unit 50 are substantially point-symmetric with respect to the center R3 of the mirror 11. Therefore, they can be offset each other.
The drive units 41, 43, 45, 51, 53 and 55 have a length L3 of about 12 mm in the Y direction and a width W1 of about 0.4 mm in the X direction. Further, the support portions 42, 44, 52 and 54 have a length L3 of about 12 mm in the Y direction and a width W2 of about 0.3 mm in the X direction. The mirror support portions 46 and 56 have a length L4 of about 3.5 mm in the Y direction and a width W2 of about 0.3 mm in the X direction. The rotation center R2 passing through the center R3 of the mirror 11 is supported by the drive units 41, 43, 45, 51, 53, and 55 in the non-drive state of the drive units 41, 43, 45, 51, 53, and 55. It is configured to pass through substantially the center in the Y direction with respect to the portions 42, 44, 52 and 54.
The drive units 41, 43, 45, 51, 53, and 55 are configured to be deformed and driven when a voltage is applied, and the voltages applied to the drive units 41, 43, and 45 are It is comprised so that the voltage applied to the drive parts 51, 53, and 55 may be in mutually opposite phases.
Further, the end portion 41a on the Y1 side of the drive unit 41 of the drive unit 40 is fixed by an outer frame body (not shown). That is, the drive unit 41 has a cantilevered structure in which the Y1 side end 41a is a fixed end and the Y2 side end 41b is a free end. Thereby, when the drive part 41 drives, it is comprised so that the edge part 41b may be displaced and inclined in a Z direction (refer FIG. 1) by deform | transforming so that the drive part 41 may curve. At this time, the end 41a, which is a fixed end, is not displaced even when the drive unit 41 is driven. Accordingly, the tangent C1 (see FIG. 3) at the end 41b as the free end is inclined at the first inclination angle with respect to the tangent C0 (see FIG. 3) at the end 41a as the fixed end. Has been. In the present embodiment, the tangent line C0 is configured to be located on the horizontal plane.
Further, a connecting portion 41c is provided in the vicinity of the end portion 41b on the Y2 side of the driving portion 41. The drive part 41 is connected to the connection part 42b in the vicinity of the end part 42a on the Y2 side of the support part 42 at the connection part 41c. Further, the support portion 42 is configured so as not to be substantially bent even when the end portion 41b of the drive portion 41 is displaced in the Z direction (see FIG. 1) in the drive state of the drive portion 41. Thereby, in the drive state of the drive part 41, the support part 42 is located on the tangent line C1 in the end part 41b of the drive part 41 which is a free end, thereby tangent to the end part 41a of the drive part 41 which is a fixed end. It is configured to incline at a first inclination angle with respect to C0. The connecting portion 41c is an example of the “first connecting portion” in the present invention.
Further, a connecting portion 42d is provided in the vicinity of the end portion 42c on the Y1 side of the support portion 42. The support portion 42 is connected to the connection portion 43b in the vicinity of the end portion 43a on the Y1 side of the drive portion 43 at the connection portion 42d. In addition, since the support part 42 does not bend substantially, the connection part 42d is comprised so that it may be located on the tangent C1 (refer FIG. 3). Thereby, the connection part 43b (end part 43a) of the drive part 43 connected in the connection part 42d is located on the tangent C1, and is 1st inclination-angle with respect to the tangent C0 (refer FIG. 3). It is comprised so that it may incline with.
Further, the drive unit 43 connected at the connection part 42d of the support part 42 is configured to be deformed with reference to the connection part 43b (end part 43a) on the Y1 side. Thus, when the drive unit 43 is driven, the drive unit 43 is deformed so as to be warped, so that the end 43c is displaced in the Z direction (see FIG. 1) and tilted with respect to the support unit 42. It is configured. Thereby, the tangent line C2 (see FIG. 3) at the end portion 43c is configured to be inclined at the second inclination angle with respect to the tangent line C1 (see FIG. 3) at the reference end portion 43a.
Further, a connecting portion 43d is provided in the vicinity of the end portion 43c on the Y2 side of the driving portion 43. The drive part 43 is connected to the connection part 44b near the end part 44a on the Y2 side of the support part 44 at the connection part 43d. Further, the support portion 44 is configured so as not to be substantially bent even when the end portion 43c of the drive portion 43 is displaced in the Z direction (see FIG. 1) in the drive state of the drive portion 43. Thus, the support portion 44 is positioned on the tangent line C2 at the end portion 43c of the drive portion 43 in the driving state of the drive portion 43, and thereby the second inclination with respect to the tangent line C1 at the reference end portion 43a. It is configured to be inclined at an angle.
Further, a connection portion 44d is provided in the vicinity of the end portion 44c on the Y1 side of the support portion 44. The support portion 44 is connected to a connection portion 45b in the vicinity of the end portion 45a on the Y1 side of the drive portion 45 at the connection portion 44d. In addition, since the support part 44 does not bend substantially, the connection part 44d is comprised so that it may be located on the tangent C2 (refer FIG. 3). Thereby, the connection part 45b (end part 45a) of the drive part 45 connected in the connection part 44d is located on the tangent C2, and is 2nd inclination-angle with respect to the tangent C1 (refer FIG. 3). It is comprised so that it may incline with.
The drive unit 45 connected at the connection portion 44d of the support portion 44 is configured to be deformed with reference to the connection portion 45b (end portion 45a) on the Y1 side. Thus, when the drive unit 45 is driven, the drive unit 45 is deformed so that the drive unit 45 is warped, so that the end 45c is displaced in the Z direction (see FIG. 1) to be inclined with respect to the support unit 44. It is configured. Accordingly, the tangent line C3 (see FIG. 3) at the end portion 45c is configured to be inclined at the third inclination angle with respect to the tangent line C2 (see FIG. 3) at the reference end portion 45a.
Further, a connection portion 45d is provided in the vicinity of the end portion 45c on the Y2 side of the drive portion 45. The drive unit 45 is connected to the connection unit 46b in the vicinity of the Y2 side end 46a of the mirror support unit 46 at the connection unit 45d. Further, the mirror support portion 46 is configured so as not to be substantially bent even when the end portion 45c of the drive portion 45 is displaced in the Z direction (see FIG. 1) in the drive state of the drive portion 45. . As a result, the mirror support portion 46 is positioned on the tangent line C3 at the end portion 45c of the drive unit 45 in the drive state of the drive unit 45. It is configured to incline at an inclination angle. As a result, the mirror support portion 46 has a fourth sum obtained by substantially totaling the first tilt angle, the second tilt angle, and the third tilt angle with respect to the tangent line C0 (position on the horizontal plane: see FIG. 3). It is configured to incline toward the B1 side or the B2 side (see FIG. 1) at an inclination angle.
Further, the mirror support portion 46 is connected at the end portion 46c on the Y1 side in the vicinity of the end portion on the X1 side of the side surface on the Y2 side of the frame body 20 of the X direction optical scanning unit 10. As a result, in the drive unit 40, adjacent ones of the X2 side mirror support portion 46 toward the X1 side drive portion 41 are alternately folded back in the vicinity of the Y1 side end portion or the Y2 side end portion. By being connected in this manner, the mirror support unit 46 and the drive unit 41 are continuously connected.
2, the Y1 side end 41a of the drive unit 41, the Y1 side end 42c of the support unit 42, the Y1 side end 43a of the drive unit 43, and the Y1 side end of the support unit 44. The end portion 45a on the Y1 side of the unit 44c and the drive unit 45 is disposed so as to be located on the Y1 side with respect to the side surface on the Y1 side of the X direction optical scanning unit 10. Further, the Y2 side end 41b of the drive unit 41, the Y2 side end 42a of the support unit 42, the Y2 side end 43c of the drive unit 43, the Y2 side end 44a of the support unit 44, and the drive unit 45 The end portion 45c on the Y2 side is disposed so as to be located on the Y2 side with respect to the side surface on the Y2 side of the X-direction optical scanning unit 10.
Further, the end portion 51a on the Y2 side of the drive unit 51 of the drive unit 50 is fixed by an outer frame body (not shown). In other words, the drive unit 51 has a cantilever-like structure in which the Y2 end 51a is a fixed end and the Y1 end 51b is a free end. Thereby, when the drive part 51 drives, it is comprised so that the edge part 51b may be displaced and inclined in a Z direction (refer FIG. 1) by deform | transforming so that the drive part 51 may curve. At this time, the end 51a, which is a fixed end, is not displaced even when the drive unit 51 is driven. Accordingly, the tangent line D1 (see FIG. 3) at the free end 51b is inclined at the fifth inclination angle with respect to the tangent line D0 (see FIG. 3) at the fixed end 51a. Has been. In the present embodiment, the tangent line D0 is configured to be located on the horizontal plane.
Further, a connecting portion 51c is provided in the vicinity of the end portion 51b on the Y1 side of the driving portion 51. The drive part 51 is connected to a connection part 52b in the vicinity of the end part 52a on the Y1 side of the support part 52 at the connection part 51c. Further, the support portion 52 is configured so as not to be substantially bent even when the end portion 51b of the drive portion 51 is displaced in the Z direction (see FIG. 1) in the drive state of the drive portion 51. Thereby, in the drive state of the drive part 51, the support part 52 is located on the tangent line D1 in the end part 51b of the drive part 51 which is a free end, thereby tangent to the end part 51a of the drive part 51 which is a fixed end. It is configured to incline at a fifth inclination angle with respect to D0. The connection portion 51c is an example of the “second connection portion” in the present invention.
Further, a connecting portion 52d is provided in the vicinity of the end portion 52c on the Y2 side of the support portion 52. The support part 52 is connected to the connection part 53b in the vicinity of the end part 53a on the Y2 side of the drive part 53 at the connection part 52d. In addition, since the support part 52 does not bend substantially, the connection part 52d is comprised so that it may be located on the tangent D1 (refer FIG. 3). Thereby, the connection part 53b (end part 53a) of the drive part 53 connected in the connection part 52d is located on the tangent line D1, and is 5th inclination-angle with respect to the tangent line D0 (refer FIG. 3). It is comprised so that it may incline with.
The drive unit 53 connected at the connection part 52d of the support part 52 is configured to be deformed with reference to the connection part 53b (end part 53a) on the Y2 side. Thereby, when the drive part 53 drives, it deform | transforms so that the drive part 53 may warp, and the edge part 53c is displaced to a Z direction (refer FIG. 1), and it is made to incline with respect to the support part 52. It is configured. Accordingly, the tangent line D2 (see FIG. 3) at the end portion 53c is configured to be inclined at the sixth inclination angle with respect to the tangent line D1 (see FIG. 3) at the reference end portion 53a.
Further, a connecting portion 53d is provided in the vicinity of the end portion 53c on the Y1 side of the driving portion 53. The drive portion 53 is connected to a connection portion 54b near the end portion 54a on the Y1 side of the support portion 54 at the connection portion 53d. Further, the support portion 54 is configured not to bend substantially even when the end portion 53c of the drive portion 53 is displaced in the Z direction (see FIG. 1) in the drive state of the drive portion 53. As a result, the support portion 54 is positioned on the tangent line D2 at the end portion 53c of the drive portion 53 in the drive state of the drive portion 53, thereby causing the sixth inclination relative to the tangent line D1 at the reference end portion 53a. It is configured to be inclined at an angle.
Further, a connecting portion 54d is provided in the vicinity of the end portion 54c on the Y2 side of the support portion 54. The support portion 54 is connected to the connection portion 55b in the vicinity of the end portion 55a on the Y2 side of the drive portion 55 at the connection portion 54d. In addition, since the support part 54 does not bend substantially, the connection part 54d is comprised so that it may be located on the tangent D2 (refer FIG. 3). Thereby, the connection part 55b (end part 55a) of the drive part 55 connected in the connection part 54d is located on the tangent D2, and is 6th inclination-angle with respect to the tangent D1 (refer FIG. 3). It is comprised so that it may incline with.
The drive unit 55 connected at the connection portion 54d of the support portion 54 is configured to be deformed with reference to the Y2 side connection portion 55b (end portion 55a). Thus, when the drive unit 55 is driven, the drive unit 55 is deformed so that the drive unit 55 is warped, so that the end 55c is displaced in the Z direction (see FIG. 1) and is inclined with respect to the support unit 54. It is configured. Accordingly, the tangent line D3 (see FIG. 3) at the end portion 55c is configured to be inclined at the seventh inclination angle with respect to the tangent line D2 (see FIG. 3) at the reference end portion 55a.
Further, a connecting portion 55d is provided in the vicinity of the end portion 55c on the Y1 side of the driving portion 55. The drive unit 55 is connected to the connection unit 56b in the vicinity of the end portion 56a on the Y1 side of the mirror support unit 56 at the connection unit 55d. Further, the mirror support portion 56 is configured so as not to be bent substantially even when the end portion 55c of the drive portion 55 is displaced in the Z direction (see FIG. 1) in the drive state of the drive portion 55. . Thereby, the mirror support part 56 is positioned on the tangent line D3 at the end part 55c of the drive part 55 in the drive state of the drive part 55, so that the seventh tangent line D2 at the reference end part 55a is It is configured to incline at an inclination angle. As a result, the mirror support portion 56 has an eighth sum that is substantially the sum of the fifth tilt angle, the sixth tilt angle, and the seventh tilt angle with respect to the tangent line D0 (position on the horizontal plane: see FIG. 3). It is configured to incline toward the B1 side or the B2 side (see FIG. 1) at an inclination angle.
Further, the mirror support portion 56 is connected at the end portion 56c on the Y2 side in the vicinity of the end portion on the X2 side of the side surface on the Y1 side of the frame body 20 of the X-direction optical scanning unit 10. As a result, in the drive unit 50, adjacent ones of the X1 side mirror support part 56 toward the X2 side drive part 51 are alternately folded back in the vicinity of the Y1 side end part or the Y2 side end part. By being connected in this manner, the mirror support unit 56 and the drive unit 51 are continuously connected.
2, the Y2 side end 51a of the drive unit 51, the Y2 side end 52c of the support unit 52, the Y2 side end 53a of the drive unit 53, and the Y2 side end of the support unit 54. The end portion 55a on the Y2 side of the portion 54c and the drive portion 55 is disposed so as to be located on the Y2 side with respect to the side surface on the Y2 side of the X direction optical scanning portion 10. Also, the Y1 side end 51b of the drive unit 51, the Y1 side end 52a of the support unit 52, the Y1 side end 53c of the drive unit 53, the Y1 side end 54a of the support unit 54, and the drive unit 55 The end portion 55c on the Y1 side is disposed so as to be located on the Y1 side with respect to the side surface on the Y1 side of the X-direction optical scanning unit 10.
In the non-driving state of the drive units 41, 43, 45, 51, 53, and 55, the X-direction light scanning unit 10 and the Y-direction light scanning unit 30 (drive units 40 and 50) are on the Y1 side of the drive unit 41. It is arranged substantially parallel to a plane (horizontal plane) passing through the end (fixed end) 41a and the Y2 side end (fixed end) 51a of the drive unit 51.
In addition, when the drive units 41, 43, 45, 51, 53, and 55 are driven while being deformed by applying a voltage, the drive unit 40 and the drive unit 50 have a substantially point-symmetrical relationship, The mirror support portion 46 and the mirror support portion 56 are configured to have substantially the same degree of inclination. Furthermore, the voltage applied to the drive units 41, 43 and 45 and the voltage applied to the drive units 51, 53 and 55 are in opposite phases, so that the tangent line C0 (position on the horizontal plane) of the mirror support unit 46 is obtained. ) And the eighth inclination angle with respect to the tangent line D0 (positioned on the horizontal plane) of the mirror support portion 56 are configured to be symmetric with respect to the horizontal plane. In other words, the eighth inclination angle with respect to the horizontal plane of the mirror support portion 56 is opposite to the direction of the fourth inclination angle with respect to the horizontal plane of the mirror support portion 46, and the size (scalar amount) is substantially the same. It is configured as follows.
The X-direction optical scanning unit 10 is connected to the mirror support 46 near the X1-side end of the side surface on the Y2 side of the frame 20 of the X-direction optical scanning unit 10, while the Y1 side of the frame 20 The side surface on the Y1 side of the frame body 20 is positioned above (Z1 side) or below (Z2 side) the side surface on the Y2 side by being connected to the mirror support portion 56 in the vicinity of the end portion on the X2 side of the side surface. By doing so, it is configured to incline in the B direction (see FIG. 1). As a result, the X-direction optical scanning unit 10 is configured to be supported in an inclined state by the mirror support units 46 and 56 while being positioned on a plane including the tangent lines C3 and D3. A specific driving operation of the Y-direction optical scanning unit 30 will be described later.
Further, as shown in FIGS. 4 and 6 to 8, the inner drive units 16 and 17 (see FIG. 4) and the drive units 41, 43, 45, 51, 53, and 55 are arranged on the upper surface (Z1 The piezoelectric actuator 60 is formed on the side surface). As shown in FIG. 9, the piezoelectric actuator 60 has a structure in which a lower electrode 61, a piezoelectric body 62, and an upper electrode 63 are laminated from the Si substrate 1 side (Z2 side). The lower electrode 61 is made of Ti or Pt, and is formed on the upper surface of the Si substrate 1. Accordingly, the wiring process to the lower electrode 61 of the piezoelectric actuator 60 can be performed on an arbitrary portion of the Si substrate 1. Since the thickness of the piezoelectric actuator 60 is sufficiently smaller than that of the Si substrate 1, the piezoelectric actuator 60 formed in the drive units 41, 43, 45, 51, 53 and 55 in FIGS. 3, 11 and 12. Is omitted. Further, since the thickness of the lower electrode 61 is sufficiently small, the illustration of the lower electrode 61 formed on the upper surface of the Si substrate 1 is omitted in drawings other than FIG.
Further, as shown in FIG. 9, the piezoelectric body 62 is made of lead zirconate titanate (PZT) and is configured to expand and contract when a voltage is applied by being polarized in the film thickness direction (Z direction). Has been. The piezoelectric body 62 is formed on the upper surfaces of the lower electrodes 61 of the support portions 42, 44, 52 and 54 (see FIG. 4), the mirror support portion 46 (see FIG. 6), and the mirror support portion 56 (see FIG. 7). Is also formed. Further, as shown in FIG. 2, by forming the piezoelectric body 62 (see FIG. 9), the drive unit 40 (drive units 41, 43 and 45) and the drive unit 50 (drive units 51, 53 and 55) are formed. In these cases, residual stress is accumulated. Since the thickness of the piezoelectric body 62 is sufficiently small with respect to the Si substrate 1, in FIGS. 3, 11, and 12, on the upper surfaces of the support portions 42, 44, 52 and 54 and the mirror support portions 46 and 56, Illustration of the formed piezoelectric body 62 is omitted.
As shown in FIG. 9, the upper electrode 63 is made of a conductive metal material such as Al, Cr, Cu, Au, or Pt.
Next, with reference to FIG. 1, FIG. 3, and FIGS. 9-13, the drive operation | movement of the Y direction optical scanning part 30 of the vibration mirror element 100 by one Embodiment of this invention is demonstrated.
From the state where the drive units 41, 43, 45, 51, 53 and 55 as shown in FIG. 1 and FIG. 3 are kept in a horizontal state due to the non-drive state, as shown in FIG. A voltage is applied to the drive units 41, 43 and 45 so that the upper surface side (Z1 side) of the piezoelectric actuator 60 is contracted more than the lower surface side (Z2 side). On the other hand, the lower surface side (Z2 side) of the piezoelectric actuator 60 having the phase opposite to the voltage applied to the driving units 41, 43 and 45 is applied to the driving units 51, 53 and 55 of the driving unit 50 on the upper surface side (Z1 side). Apply a voltage that is more contracted than
Accordingly, as shown in FIG. 11, in the drive units 41, 43, and 45, the Y2 side end portions 41b, 43c, and 45c are located above the Y1 side end portions 41a, 43a, and 45a (Z1 side), respectively. By being positioned, the drive units 41, 43 and 45 are deformed to warp upward. At this time, the end 41b of the drive unit 41 is inclined toward the B1 side with the first inclination angle θ1 on the Z1 side with respect to the tangent line C0. Further, the end 43c of the drive unit 43 is inclined toward the B1 side with a second inclination angle θ2 on the Z1 side with respect to the tangent line C1. Further, the end 45c of the drive unit 45 is inclined toward the B1 side with a third inclination angle θ3 on the Z1 side with respect to the tangent line C2. As a result, the mirror support unit 46 adds the first tilt angle θ1, the second tilt angle θ2, and the third tilt angle θ3 to the Z1 side with respect to the tangent C0 (positioned on the horizontal plane). With an inclination angle θ4 (= θ1 + θ2 + θ3).
On the other hand, as shown in FIG. 12, in the drive units 51, 53, and 55, the Y1 side end portions 51b, 53c, and 55c are positioned below (Z2 side) the Y2 side end portions 51a, 53a, and 55a, respectively. As a result, the drive units 51, 53, and 55 are deformed to warp downward. At this time, the end portion 51b of the drive unit 51 is inclined toward the B1 side with the fifth inclination angle θ5 on the Z2 side with respect to the tangent line D0. Further, the end 53c of the drive unit 53 is inclined toward the B1 side with a sixth inclination angle θ6 on the Z2 side with respect to the tangent line D1. Further, the end portion 55c of the drive unit 55 is inclined toward the B1 side with a seventh inclination angle θ7 on the Z2 side with respect to the tangent line D2. As a result, the mirror support portion 56 adds the fifth inclination angle θ5, the sixth inclination angle θ6, and the seventh inclination angle θ7 to the Z2 side with respect to the tangent line D0 (positioned on the horizontal plane). With an inclination angle θ8 (= θ5 + θ6 + θ7).
Here, the first inclination angle θ1 and the fifth inclination angle θ5 are substantially the same, the second inclination angle θ2 and the sixth inclination angle θ6 are substantially the same, and the third inclination angle θ3. And the seventh inclination angle θ7 are substantially the same. Therefore, the fourth inclination angle θ4 (= θ1 + θ2 + θ3) and the eighth inclination angle θ8 (= θ5 + θ6 + θ7) are configured to be substantially the same.
As a result, as shown in FIG. 10, the mirror support portion 46 is in a state in which the fourth inclination angle θ4 (see FIG. 11) is maintained on the Z1 side with respect to the tangent C0 (see FIG. 11), and the mirror The support portion 46 itself is inclined to the B1 side without being bent. On the other hand, the mirror support part 56 maintains the eighth inclination angle θ8 (= θ4) (see FIG. 12) on the Z2 side with respect to the tangent line D0 (see FIG. 12), and the mirror support part 56 itself. Is tilted to the B1 side without being bent. Accordingly, the X-direction optical scanning unit 10 (mirror 11) is supported by the mirror support unit 46 on the X1 side and the Y2 side, and supported by the mirror support unit 56 on the X2 side and the Y1 side. ) Is inclined toward the B1 side with respect to the horizontal plane including the tangent lines C0 and D0. At this time, the X-direction optical scanning unit 10, the mirror support unit 46, and the mirror support unit 56 are positioned in substantially the same plane while being inclined toward the B1 side.
Further, as shown in FIG. 13, a voltage is applied to the drive units 41, 43 and 45 of the drive unit 40 such that the lower surface side (Z2 side) of the piezoelectric actuator 60 is contracted more than the upper surface side (Z1 side). . On the other hand, the upper surface side (Z1 side) of the piezoelectric actuator 60 having the phase opposite to the voltage applied to the drive units 41, 43 and 45 is applied to the drive units 51, 53 and 55 of the drive unit 50 on the lower surface side (Z2 side). Apply a voltage that is more contracted than
Accordingly, as shown in FIG. 12, in the drive units 41, 43, and 45, the Y2 side end portions 41b, 43c, and 45c are respectively lower than the Y1 side end portions 41a, 43a, and 45a (Z2 side). By being positioned, the drive units 41, 43 and 45 are deformed to warp downward. At this time, the end 41b of the drive unit 41 is inclined toward the B2 side with the first inclination angle θ1 on the Z2 side with respect to the tangent line C0. Further, the end 43c of the drive unit 43 is inclined toward the B2 side with the second inclination angle θ2 on the Z2 side with respect to the tangent line C1. Further, the end 45c of the drive unit 45 is inclined toward the B2 side with the third inclination angle θ3 on the Z2 side with respect to the tangent line C2. As a result, the mirror support unit 46 adds the first inclination angle θ1, the second inclination angle θ2, and the third inclination angle θ3 to the Z2 side with respect to the tangent line C0 (positioned on the horizontal plane). With an inclination angle of θ4 (= θ1 + θ2 + θ3).
On the other hand, as shown in FIG. 11, in the driving units 51, 53, and 55, the Y1 side ends 51b, 53c, and 55c are positioned above (the Z1 side) the Y2 side ends 51a, 53a, and 55a, respectively. As a result, the drive units 51, 53, and 55 are deformed to warp upward. At this time, the end 51b of the drive unit 51 is inclined toward the B2 side with a fifth inclination angle θ5 on the Z1 side with respect to the tangent line D0. Further, the end 53c of the drive unit 53 is inclined toward the B2 side with a sixth inclination angle θ6 on the Z1 side with respect to the tangent line D1. Further, the end portion 55c of the drive unit 55 is inclined toward the B2 side with a seventh inclination angle θ7 on the Z1 side with respect to the tangent line D2. As a result, the mirror support portion 56 adds the fifth inclination angle θ5, the sixth inclination angle θ6, and the seventh inclination angle θ7 to the Z1 side with respect to the tangent line D0 (positioned on the horizontal plane). With an inclination angle θ8 (= θ5 + θ6 + θ7). Here, as described above, the fourth inclination angle θ4 and the eighth inclination angle θ8 are configured to be substantially the same.
As a result, as shown in FIG. 13, the mirror support 46 is in a state where the fourth inclination angle θ4 (see FIG. 12) is maintained on the Z2 side with respect to the tangent C0 (see FIG. 12), and the mirror The support portion 46 itself is inclined to the B2 side without being bent. On the other hand, the mirror support part 56 maintains the eighth inclination angle θ8 (= θ4) (see FIG. 11) on the Z1 side with respect to the tangent line D0 (see FIG. 11), and the mirror support part 56 itself. Is tilted to the B2 side without being bent. As a result, the X-direction optical scanning unit 10 (mirror 11) is inclined toward the B2 side at an inclination angle θ4 with respect to the horizontal plane including the tangent lines C0 and D0. At this time, the X-direction optical scanning unit 10, the mirror support unit 46, and the mirror support unit 56 are positioned in substantially the same plane in a state inclined to the B2 side.
Furthermore, in the drive units 41, 43, 45, 51, 53 and 55 of the Y-direction optical scanning unit 30, the upper surface side (Z1 side) of the piezoelectric actuator 60 contracts more than the lower surface side (Z2 side) at a frequency of about 60 Hz. The voltage is applied so as to perform non-resonant driving so that the state in which the lower surface side (Z2 side) is contracted more than the upper surface side (Z1 side) is repeated. As a result, the X-direction optical scanning unit 10 (mirror 11) is repeatedly tilted to the B1 side as shown in FIG. 10 and the state tilted to the B2 side as shown in FIG. As a result, the Y-direction light scanning unit 30 scans light in the Y direction (not shown) by tilting the mirror 11 around the rotation center R2 in the B direction.
Next, with reference to FIG. 8, FIG. 9, FIG. 14 and FIG. 15, a manufacturing process of the vibrating mirror element 100 according to the embodiment of the present invention will be described. 14 and 15 are cross-sectional views taken along the line 5000-5000 shown in FIG.
First, as shown in FIG. 14, the Si substrate 1, the SiO 2 layer 2 formed on the lower surface (Z2 side) of the Si substrate 1, and the lower Si layer 3 formed on the lower surface of the SiO 2 layer 2 are included. An SOI substrate 4 is prepared. Then, the lower electrode 61 (see FIG. 9) and the piezoelectric body 62 (see FIG. 9) are sequentially formed on the entire upper surface of the SOI substrate 4 (the surface on the Z1 side of the Si substrate 1) by sputtering or the like. Then, the upper electrode 63 (see FIG. 9) is formed on the upper surface of the piezoelectric body 62 corresponding to the inner driving portions 16 and 17 and the driving portions 41, 43, 45, 51, 53 and 55 by vapor deposition or the like. In this way, the piezoelectric actuator 60 is formed in the inner drive units 16 and 17 and the drive units 41, 43, 45, 51, 53, and 55.
Then, photolithography is performed at positions corresponding to the inner drive units 16 and 17, the drive units 41, 43, 45, 51, 53 and 55, the support units 42, 44, 52 and 54, and the mirror support units 46 and 56. After forming a resist pattern (not shown) by performing wet etching or the like using the resist pattern as a mask, the inner driving units 16 and 17, and the driving units 41, 43, 45, 51, 53 and 55, The piezoelectric body 62 formed at a position other than the positions corresponding to the support portions 42, 44, 52 and 54 and the mirror support portions 46 and 56 is removed. Thereafter, a mask made of Al, Cr, Cu, Au, Pt, or the like by vapor deposition or the like at a position corresponding to the frame 20 on the lower surface of the SOI substrate 4 (the surface on the Z2 side of the lower Si layer 3) and the outer frame not shown. Pattern 5 is formed.
Then, after a resist pattern (not shown) is formed by photolithography at a position corresponding to the vibrating mirror element 100, wet etching or the like is performed using the resist pattern as a mask, so that a position other than the position corresponding to the vibrating mirror element 100 is obtained. The lower electrode 61 (see FIG. 9) formed at the position is removed. Thereby, the lower electrode 61 is formed only on the upper surface (the surface on the Z1 side) of the Si substrate 1 on which the vibrating mirror element 100 is formed.
Thereafter, as shown in FIG. 15, the Si substrate 1 formed at a position other than the position corresponding to the vibrating mirror element 100 is removed by reactive ion etching (RIE) or the like. Then, using the mask pattern 5 as a mask, the lower Si layer 3 formed at a position other than the position corresponding to the frame 20 and the outer frame not shown is removed by reactive ion etching (RIE) or the like. Thereafter, the SiO 2 layer 2 formed at a position other than the position corresponding to the vibrating mirror element 100 is removed by reactive ion etching (RIE) or the like. As a result, the vibrating mirror element 100 shown in FIG. 8 is formed.
In the present embodiment, as described above, the drive unit 41, the support unit 42, the drive unit 43, the support unit 44, the drive unit 45, and the mirror support unit 46 of the drive unit 40, the drive unit 51 of the drive unit 50, and the support unit. 52, the drive unit 53, the support unit 54, the drive unit 55, and the mirror support unit 56 are configured so as to have a substantially point-symmetrical relationship with respect to the center R3 of the mirror 11, respectively. Thus, the X-direction optical scanning unit 10 can be supported by the drive unit 40 and the drive unit 50 that have a substantially point-symmetric arrangement relationship. As a result, the weight of the X-direction optical scanning unit 10 can be evenly distributed to the mirror support unit 46 and the mirror support unit 56, and therefore, the X-direction optical scanning unit 10 can be prevented from being tilted in the non-driven state. it can.
In the present embodiment, as described above, the Y1 side end 41a of the drive unit 41, the Y1 side end 42c of the support unit 42, the Y1 side end 43a of the drive unit 43, and the Y1 of the support unit 44 are provided. The end 44c on the side and the end 45a on the Y1 side of the drive unit 45 are arranged so as to be located on the Y1 side with respect to the side surface on the Y1 side of the X direction optical scanning unit 10, and the end on the Y2 side of the drive unit 41 41b, the end portion 42a on the Y2 side of the support portion 42, the end portion 43c on the Y2 side of the drive portion 43, the end portion 44a on the Y2 side of the support portion 44, and the end portion 45c on the Y2 side of the drive portion 45 The Y-side end 51a of the driving unit 51, the Y2-side end 52c of the support unit 52, and the Y2-side of the driving unit 53 are disposed so as to be positioned on the Y2 side of the Y2 side surface of the scanning unit 10. The end portion 53a, the end portion 54c on the Y2 side of the support portion 54, and the Y2 side of the drive portion 55 The portion 55a is disposed so as to be located on the Y2 side with respect to the side surface on the Y2 side of the X-direction optical scanning unit 10, the end portion 51b on the Y1 side of the drive unit 51, the end portion 52a on the Y1 side of the support unit 52, and the drive The end portion 53c on the Y1 side of the portion 53, the end portion 54a on the Y1 side of the support portion 54, and the end portion 55c on the Y1 side of the drive portion 55 are positioned on the Y1 side with respect to the side surface on the Y1 side of the X-direction optical scanning portion 10. By arranging in such a manner, the drive units 41, 43, 45, 51, 53 and 55 are formed so as to extend from the Y1 side in the Y direction of the X direction optical scanning unit 10 (mirror 11) toward the Y2 side. can do. That is, the drive units 41, 43, and 45 and the drive units 41, 43, and 45 and the drive units 51, 53, and 55 are arranged so that the X-direction optical scanning unit 10 is sandwiched in a direction orthogonal to the Y direction (X direction). And the drive units 51, 53, and 55 can be arranged side by side in the X direction. As a result, the drive units 41, 43 and 45 and the drive units 51, 53 and 55 are not arranged on a common straight line extending in the Y direction, so that each of the drive units 41, 43, 45, 51, 53 and 55 Even when the length in the Y direction is increased, the entire oscillating mirror element 100 does not become longer in the Y direction by the total length of the increased lengths in the drive units 41, 43, 45, 51, 53, and 55. . As a result, the size of the oscillating mirror element 100 can be suppressed from becoming longer in the Y direction.
Further, in the present embodiment, as described above, the residual stress of the drive unit 40 and the residual stress of the drive unit 50 are approximately point-symmetric with respect to the center R3 of the mirror 11 between the drive unit 40 and the drive unit 50. In this case, the residual stresses are easily accumulated in the drive units 41, 43, 45, 51, 53, and 55. In the non-driving state, the X direction optical scanning is performed on a plane (horizontal plane) passing through the Y1 side end (fixed end) 41a of the drive unit 41 and the Y2 side end (fixed end) 51a of the drive unit 51. It can suppress that the part 10 (mirror 11) inclines.
In the present embodiment, as described above, in the non-driven state of the drive units 41, 43, 45, 51, 53, and 55, the X-direction light scanning unit 10 and the Y-direction light scanning unit 30 (drive units 40 and 50). ) Is disposed substantially parallel to a plane (horizontal plane) passing through the Y1 side end (fixed end) 41a of the drive unit 41 and the Y2 side end (fixed end) 51a of the drive unit 51. Mirrors substantially parallel to a horizontal plane passing through the end 41a of the drive unit 41 and the end 51a of the drive unit 51 that are not displaced in any of the drive state and non-drive state of 41, 43, 45, 51, 53 and 55 Therefore, the X-direction optical scanning unit 10 (mirror 11) can be tilted stably.
In the present embodiment, as described above, in the drive unit 40, the drive unit 41, the support unit 42, the drive unit 43, the support unit 44, the drive unit 45, and the mirror support unit 46 are sequentially arranged from the X1 side along the X direction. In the drive unit 50, the drive unit 51, the support unit 52, the drive unit 53, the support unit 54, the drive unit 55, and the mirror support unit 56 are sequentially arranged from the X2 side along the X direction. The X-direction optical scanning unit 10 (mirror 11) is driven at the time of driving by driving the driving units 43, 45, 53, and 55 in addition to the driving units 41 and 51. It can be tilted with a larger tilt angle.
Further, in the present embodiment, as described above, the mirror support portion 46 has substantially the first inclination angle, the second inclination angle, and the third inclination angle with respect to the tangent line C0 (positioned on the horizontal plane). The mirror support unit 56 is configured to be inclined toward the B1 side or the B2 side at the total fourth inclination angle, and the fifth inclination angle and the sixth inclination with respect to the tangent line D0 (positioned on the horizontal plane). The mirror support portion 46 is inclined at the connection portion 41c (end portion 41b) by being configured to be inclined toward the B1 side or the B2 side at an eighth inclination angle that is substantially the sum of the angle and the seventh inclination angle. Accordingly, the X-direction light scanning unit 10 (mirror 11) can be supported, and the mirror support unit 56 can support the X-direction light scanning unit 10 according to the inclination of the connection portion 51c (end portion 51b). it can. Moreover, since the inclination angle in the mirror support parts 46 and 56 can be further increased, the inclination angle of the X-direction light scanning part 10 can be further increased.
In the present embodiment, as described above, when the driving units 41, 43, 45, 51, 53, and 55 are driven while being deformed, the X-direction optical scanning unit 10 is on a plane including the tangent lines C3 and D3. In such a state, the mirror support unit 46 and the mirror support unit 56 are supported by the mirror support units 46 and 56 so that the mirror support unit 46 is tilted, the mirror support unit 56 is tilted, and the X-direction optical scanning unit 10 is The X-direction optical scanning unit 10 (mirror 11) can be stably tilted while maintaining the tilt substantially the same.
In the present embodiment, as described above, the voltage applied to the drive units 41, 43, and 45 and the voltage applied to the drive units 51, 53, and 55 are configured to have opposite phases. Therefore, it is possible to easily cause the drive units 41, 43, and 45 and the drive units 51, 53, and 55 to be deformed to warp in different directions. As a result, the end 41b of the drive unit 41 and the end 51b of the drive unit 51 are displaced to the same extent on the opposite sides with respect to the position in the non-driven state, and the end 43c of the drive unit 43 and the end of the drive unit 53 The portion 53c is displaced to the same extent on the opposite side with respect to the position in the non-driving state, and the end 45c of the driving portion 45 and the end portion 55c of the driving portion 55 are on the opposite sides with respect to the position in the non-driving state. It can be configured to displace to the same extent. Thereby, the mirror support part 46 and the mirror support part 56 having a substantially point-symmetrical relationship with the mirror support part 46 can be inclined at substantially the same inclination angle (θ4 = θ8). As a result, the X-direction optical scanning unit 10 (mirror 11) supported by the mirror support units 46 and 56 can be tilted in the B direction.
Further, in the present embodiment, as described above, in the drive unit 40, the adjacent ones are alternately folded back on the Y1 side or the Y2 side sequentially from the X2 side mirror support part 46 toward the X1 side drive part 41. Are connected continuously from the mirror support unit 46 to the drive unit 41, and in the drive unit 50, the drive unit 50 is adjacent to the drive unit 51 on the X2 side from the mirror support unit 56 on the X1 side. By connecting the mirrors so as to be alternately folded back on the Y1 side or the Y2 side sequentially, the mirror support unit 56 and the drive unit 51 are continuously connected to each other. The drive part 43 can be driven based on the displacement in the part 41b (connection part 41c), and the end part 43c (connection part 43d) of the drive part 43 can be driven. Based on the definitive displacement, it is possible to drive the drive unit 45. Further, the driving unit 53 can be driven based on the displacement at the end 51b (connecting portion 51c) of the driving unit 51, and the driving is performed based on the displacement at the end 53c (connecting portion 53d) of the driving unit 53. The unit 55 can be driven. Thereby, since the inclination angle in the mirror support parts 46 and 56 can be made larger, the inclination angle of the X direction light scanning part 10 (mirror 11) can be made larger.
In the present embodiment, as described above, the mirror 11 is provided by providing the X-direction optical scanning unit 10 with the mirror 11 and the inner drive units 16 and 17 that rotate the mirror 11 around the rotation center R1. The light can be accurately reflected around the rotation center R2, and the light can be scanned two-dimensionally by the rotation about the rotation center R1 and the rotation about the rotation center R2.
In the present embodiment, as described above, the X-direction optical scanning unit 10 is configured to be resonantly driven at a resonance frequency of about 30 kHz, while the Y-direction optical scanning unit 30 is non-resonant at a frequency of about 60 Hz. By being configured to drive, the X-direction optical scanning unit 10 scans light two-dimensionally in a state where the X-direction optical scanning unit 10 is configured to rotate at a greater frequency about the rotation center R1 than about the rotation center R2. be able to.
In the present embodiment, as described above, the drive units 40 and 50 (the Y-direction light scanning unit 30) and the X-direction light scanning unit 10 are integrally formed on the common Si substrate 1. Since it is not necessary to separately connect each other, the manufacturing process of the vibrating mirror element 100 can be simplified.
For example, in the above embodiment, an example in which the vibrating mirror element 100 includes the X direction light scanning unit 10 and the Y direction light scanning unit 30 and the mirror 11 is rotated in the A direction and the B direction (two-dimensional) is shown. However, the present invention is not limited to this. For example, unlike the vibrating mirror element 200 in the first modification shown in FIG. 16, the present embodiment is configured by including the Y-direction light scanning unit 230 and the mirror 211 without including the X-direction light scanning unit. You may comprise so that it may be rotated only (one-dimensionally) in the B direction (refer FIG. 1) of a form. At this time, the mirror 211 is connected to the Y1 side end 246d of the mirror support 246 of the drive unit 240 on the X1 side and on the Y2 side, and on the X2 side and on the Y1 side, the drive unit 250. The mirror support 256 is connected to the end 256d on the Y2 side. Thus, the mirror 211 is configured to be tiltable in the B direction. In addition, the drive unit 240 and the drive unit 250 are configured to have a substantially point-symmetric relationship with the center R3 of the mirror 211 as the center. The mirror 211 is an example of the “mirror part” in the present invention.
Moreover, in the said embodiment, the drive parts 41, 43, 45, 51, 53, and 55 show the example which has the structure where the piezoelectric actuator 60 was formed in the upper surface (Z1 side surface) of Si substrate 1. FIG. However, like the vibrating mirror element 300 in the second modification shown in FIG. 17, the insulating layer 370 and the wiring portion are further formed on the upper surface of the piezoelectric actuator 60 formed in the drive portions 341, 343, 345, 351, 353 and 355. 380 may be formed to extend in the Y direction (see FIG. 1), and a contact hole 370a may be formed in the insulating layer 370. As a result, the upper electrode 63 of the piezoelectric actuator 60 and the wiring part 380 can be connected via the contact hole 370a. Therefore, the drive part 341, the wiring part 380 and the contact hole 370a can be easily connected. It becomes possible to apply a voltage to the upper electrode 63 of the piezoelectric actuator 60 of 343, 345, 351, 353 and 355. Further, in the vibrating mirror element 300 according to the second modification, as shown in FIG. 18, on the upper surface of the piezoelectric body 62 arranged on the upper surfaces of the support portions 342, 344, 352 and 354 and the mirror support portions 346 and 356. Further, an insulating layer 370 and a wiring portion 380 are formed. And as shown in FIG.19 and FIG.20, the connection part (connection part 41c, 42b, 42d, 43b, 43d, 44b, 44d, 45b, 45d, 46b, and the adjacent drive part and a support part or a mirror support part, 51c, 52b, 52d, 53b, 53d, 54b, 54d, 55b, 55d, 56b), the wiring portions 380 may be connected to each other. With this configuration, the same voltage can be easily applied to the drive units 341, 343, and 345 of the drive unit 340, and the same voltage is applied to the drive units 351, 353, and 355 of the drive unit 350. A voltage can be applied. Furthermore, by connecting the inner drive unit 16 (see FIG. 1) and the wiring unit 380 of the mirror support unit 346, it is possible to easily apply a voltage to the inner drive unit 16 and to use the inner drive unit 17 as well. By connecting (see FIG. 1) and the wiring part 380 of the mirror support part 356, it becomes possible to easily apply a voltage to the inner drive part 17. The piezoelectric actuator 60 is an example of the “driving part” in the present invention, and the upper electrode 63 is an example of the “electrode” in the present invention.
Moreover, in the said embodiment, two 1st support parts (support part 42 and 44) are provided between the drive part 41 (1st drive part) of the drive unit 40, and the mirror support part 46 (1st mirror support part). Two third drive units (drive units 43 and 45) are provided, and two second drive units are provided between the drive unit 51 (second drive unit) and the mirror support unit 56 (second mirror support unit) of the drive unit 50. Although the example which provided 2 support parts (support parts 52 and 54) and two 4th drive parts (drive parts 53 and 55) was shown, the present invention is not limited to this. In the present invention, one or less or three or more first support portions and third drive portions may be provided between the first drive portion and the first mirror support portion, or the second drive portion and the second drive portion may be provided. One or less or three or more second support parts and four or more fourth drive parts may be provided between the mirror support parts. At this time, the second support portion and the fourth drive portion need to be provided so as to have a substantially point-symmetrical relationship with the first support portion and the third drive portion, respectively, with the center of the mirror portion as the symmetry point.
Moreover, in the said embodiment, while providing the connection part 41c in the vicinity of the edge part 41b by the side of Y2 of the drive part 41, the connection part 51c was provided in the vicinity of the edge part 51b by the side of the Y1 of the drive part 51 was shown. However, the present invention is not limited to this. In the present invention, as long as the connection part is provided on the free end side of the drive part, the connection part may not be provided near the end part of the drive part.
Moreover, in the said embodiment, although the piezoelectric material 62 showed the example which consists of lead zirconate titanate (PZT), this invention is not limited to this. For example, it may be formed of a piezoelectric material made of an oxide mainly composed of lead, titanium and zirconium other than PZT, or other piezoelectric materials. Specifically, the piezoelectric body includes zinc oxide (ZnO), lead lanthanum zirconate titanate ((Pb, La) (Zr, Ti) O 3 ), potassium niobate (KNbO 3 ), sodium niobate (NaNbO). It may be formed of a piezoelectric material such as 3 ).
Moreover, in the said embodiment, although the residual stress was accumulate | stored in the drive unit 40 (drive part 41, 43, and 45) and the drive unit 50 (drive part 51, 53, and 55), the present invention was shown. Is not limited to this. In the present invention, the residual stress may not be accumulated in the first drive unit, the second drive unit, the third drive unit, and the fourth drive unit.
Further, in the above embodiment, the drive unit 40 is continuously connected from the mirror support 46 to the drive 41 and the drive unit 50 is continuously connected from the mirror support 56 to the drive 51. However, the present invention is not limited to this. In the present invention, the first (second) mirror support unit to the first (second) drive unit may not be continuously connected. At this time, the pair of drive units need to have a substantially point-symmetric relationship with the center of the mirror portion as a symmetric point, and the first (second) drive portion needs to be cantilevered.
In the above embodiment, the drive unit 40 is provided with two first support portions (support portions 42 and 44) and two third drive portions (drive portions 43 and 45), and the drive unit 50 has two first support portions. Although the example which provided 2 support parts (support parts 52 and 54) and two 4th drive parts (drive parts 53 and 55) was shown, the present invention is not limited to this. In the present invention, the number of first (second) support portions provided in the drive unit may be different from the number of third (fourth) drive portions. At this time, the formed second support part and fourth drive part need to have a substantially point-symmetrical relationship with the first support part and the third drive part, respectively, with the center of the mirror part as the symmetry point.
In the above embodiment, the first inclination angle θ1 and the fifth inclination angle θ5 are substantially the same, the second inclination angle θ2 and the sixth inclination angle θ6 are substantially the same, and the third In this configuration, the fourth inclination angle θ4 (= θ1 + θ2 + θ3) and the eighth inclination angle θ8 (= θ5 + θ6 + θ7) are substantially the same. However, the present invention is not limited to this. In the present invention, as long as the fourth inclination angle θ4 and the eighth inclination angle θ8 are substantially the same, the first inclination angle θ1 and the fifth inclination angle θ5 may not be substantially the same. The second inclination angle θ2 and the sixth inclination angle θ6 may not be substantially the same, and the third inclination angle θ3 and the seventh inclination angle θ7 may not be substantially the same.
In the above embodiment, an example is shown in which the Y-direction optical scanning unit 30 is configured to be non-resonantly driven at a frequency of about 60 Hz. However, the present invention is not limited to this. In the present invention, the Y-direction optical scanning unit may be configured to be resonantly driven. The Y direction optical scanning unit is preferably non-resonantly driven at a frequency of about 30 Hz to about 120 Hz.
In the above embodiment, the drive units 40 and 50 (Y direction optical scanning unit 30) and the X direction optical scanning unit 10 are integrally formed on the common Si substrate 1. The invention is not limited to this. In the present invention, the Y direction optical scanning unit and the X direction optical scanning unit may not be formed integrally, and the drive unit, the support unit, and the mirror support unit of the drive unit may not be formed integrally. For example, the Y-direction optical scanning unit may be formed by separately creating a drive unit, a support unit, and a mirror support unit and then joining them together.
In the above embodiment, the inner drive units 16 and 17 and the drive units 41, 43, 45, 51, 53, and 55 have a structure in which the lower electrode 61, the piezoelectric body 62, and the upper electrode 63 are stacked. Although the example including the actuator 60 has been shown, the present invention is not limited to this. In the present invention, the inner drive unit and the drive unit may be configured to be driven by a drive device other than the piezoelectric actuator. For example, a driving device made of an elastomer sandwiched between electrodes may be used. At this time, by applying a voltage between the electrodes, the electrodes are attracted to each other, so that the elastomer is compressed and the driving device is deformed.
10 X-direction optical scanning unit (mirror unit)
11 mirror 16, 17 inner side drive part (5th drive part)
41, 341 Drive unit (first drive unit)
41a end (first fixed end)
41b end (first free end)
41c connection part (first connection part)
42, 44, 342, 344 Supporting part (first supporting part)
43, 45, 343, 345 Drive unit (third drive unit)
43d, 45d connection part (third connection part)
46, 246, 346 Mirror support (first mirror support)
51, 351 Drive unit (second drive unit)
51a end (second fixed end)
51b end (second free end)
51c connection part (second connection part)
52, 54, 352, 354 Support part (second support part)
53, 55, 353, 355 Drive unit (fourth drive unit)
53d, 55d connection part (fourth connection part)
56, 256, 356 Mirror support (second mirror support)
60 Piezoelectric actuator (drive part)
63 Upper electrode (electrode)
100, 200, 300 Vibration mirror element 211 Mirror (mirror part)
370 Insulating layer 370a Contact hole 380 Wiring part R1 Rotation center (second rotation center)
R2 center of rotation (first center of rotation)
R3 Symmetry point X direction (second direction)
Y direction (first direction)
The first fixed end formed on one side in the first direction with respect to one end portion on the one side in the first direction of the mirror portion, and the other end portion on the other side in the first direction with respect to the mirror portion. A first free end formed on the other side of the first direction, extending linearly along the first direction, and deformable cantilevered first drive unit;
A first mirror support part capable of supporting the mirror part in an inclined state according to the inclination on the first free end side during driving;
The second fixed end formed on the other side in the first direction than the other end on the other side in the first direction of the mirror part, and the one end on the one side in the first direction of the mirror part A second free end formed on one side of the first direction, having a substantially point-symmetrical relationship with the first drive unit with respect to the center of the mirror unit as a symmetry point, and a straight line along the first direction A second cantilever-shaped second drive unit that extends in a shape and is deformable,
It has a substantially point-symmetrical relationship with the first mirror support portion with the center of the mirror portion as a symmetric point, and supports the mirror portion in an inclined state according to the inclination on the second free end side during driving. A oscillating mirror element, comprising: a second mirror support portion that is capable of.
Residual stress is accumulated in the first driving unit and the second driving unit,
The residual stress of the first driving unit and the residual stress of the second driving unit having a substantially point-symmetrical relationship with the first driving unit with respect to the center of the mirror unit are offset, thereby the mirror. The portion is disposed substantially parallel to a plane passing through the first fixed end of the first drive unit and the second fixed end of the second drive unit in a non-driven state of the first drive unit and the second drive unit. The vibrating mirror element according to claim 1.
The first driving part further includes a first connection part formed on the first free end side,
The second driving part further includes a second connection part formed on the second free end side,
The first mirror support portion is configured to be able to support the mirror portion in an inclined state according to the inclination of the first connection portion, and the second mirror support portion is The oscillating mirror element according to claim 1, wherein the oscillating mirror element is configured to be able to support the mirror portion in an inclined state according to the inclination in the second connection portion.
When driving while deforming the first drive unit and the second drive unit, the first mirror support unit, the second mirror support unit, and the mirror unit are positioned on substantially the same plane in an inclined state. The oscillating mirror element according to any one of claims 1 to 3, wherein the oscillating mirror element is configured to.
The first driving unit and the second driving unit are configured to be driven by applying a voltage,
5. The vibrating mirror element according to claim 1, wherein voltages having phases opposite to each other are applied to the first drive unit and the second drive unit. 6.
At least one third drive unit disposed between the first drive unit and the first mirror support unit, extending linearly along the first direction and deformable;
The same number of the third driving units as the first driving unit are disposed between the first driving unit and the first mirror support unit, extend linearly along the first direction, and are tiltable. When,
It has a substantially point-symmetrical relationship with the third drive unit with respect to the center of the mirror unit, and is disposed between the second drive unit and the second mirror support unit, along the first direction. A fourth drive unit extending linearly and deformable;
It has a substantially point-symmetrical relationship with the first support portion with respect to the center of the mirror portion as a symmetry point, and is disposed between the second drive portion and the second mirror support portion, along the first direction. The vibrating mirror element according to claim 1, further comprising a second support portion that extends in a straight line and is tiltable.
The third drive unit and the first support unit include the third drive unit from the first mirror support unit side toward the first drive unit side along a second direction orthogonal to the first direction. In a state where the first support portions are arranged so as to be alternately arranged, adjacent ones are sequentially connected to each other so as to be alternately folded on either one side or the other side in the first direction. By this, it is continuously connected from the first mirror support part to the first drive part,
The fourth drive unit and the second support unit include the fourth drive unit and the second support unit along the second direction from the second mirror support unit side toward the second drive unit side. Are arranged so as to be alternately arranged, adjacent ones of the first direction are connected to be alternately folded back on either one side or the other side of the first direction, whereby the second The vibrating mirror element according to claim 6, which is continuously connected from a mirror support part to the second drive part.
The third drive unit includes a third connection unit connected to the first support unit or the first mirror support unit adjacent to the mirror unit side in the second direction,
The fourth drive unit includes a fourth connection unit connected to the second support unit or the second mirror support unit adjacent to the mirror unit side in the second direction,
The first drive unit is connected to the adjacent first support unit at the first connection unit, and the second drive unit is connected to the adjacent second support unit at the second connection unit. Is configured as
The inclination angle of the first mirror support part with respect to the tangent line of the first fixed end of the first drive part is the inclination angle of the first connection part with respect to the tangent line of the first fixed end of the first drive part, and the second And approximately the sum of the inclination angle of the third connection portion of the third drive portion with respect to the adjacent first support portion located on the first drive portion side in the direction,
The inclination angle of the second mirror support part with respect to the tangent line of the second fixed end of the second drive part is equal to the inclination angle of the second connection part with respect to the tangent line of the second fixed end of the second drive part, and the second The oscillating mirror element according to claim 7, wherein the oscillating mirror element is substantially the sum of the inclination angle of the fourth connection portion of the fourth drive portion with respect to the adjacent second support portion located on the second drive portion side in the direction.
The mirror portion is configured to rotate around a first rotation center,
The said mirror part contains a mirror and the 5th drive part which rotates the said mirror around the 2nd rotation center orthogonal to the said 1st rotation center in the in-plane direction of the said mirror. The vibrating mirror element according to any one of the above.
The first driving unit and the second driving unit are configured to rotate the mirror unit around the first rotation center based on a first frequency,
10. The vibrating mirror according to claim 9, wherein the fifth drive unit is configured to rotate the mirror around the second rotation center based on a second frequency higher than the first frequency. 10. element.
The said 1st drive part, the said 1st mirror support part, the said 2nd drive part, the said 2nd mirror support part, and the said mirror part are formed in any one of Claims 1-10. The vibrating mirror element described.
The first driving unit and the second driving unit are each formed on a surface of the driving portion having an electrode, an insulating layer having a contact hole, and extending on the surface of the insulating layer. The vibrating mirror element according to claim 1, further comprising a wiring portion that is formed and connected to the electrode of the driving portion via the contact hole.
JP2010000693A 2010-01-05 2010-01-05 Oscillation mirror element Pending JP2011141333A (en)
JP2010000693A JP2011141333A (en) 2010-01-05 2010-01-05 Oscillation mirror element
EP20100842214 EP2523034A1 (en) 2010-01-05 2010-12-24 Oscillation mirror element
US13/520,411 US8867114B2 (en) 2010-01-05 2010-12-24 Vibrating mirror element
CN201080060757XA CN102713722A (en) 2010-01-05 2010-12-24 Vibrating mirror element
KR1020127016484A KR20120120180A (en) 2010-01-05 2010-12-24 Oscillation mirror element
PCT/JP2010/073305 WO2011083701A1 (en) 2010-01-05 2010-12-24 Oscillation mirror element
TW100100031A TW201140140A (en) 2010-01-05 2011-01-03 Vibration mirror element
JP2011141333A true JP2011141333A (en) 2011-07-21
ID=44305438
JP2010000693A Pending JP2011141333A (en) 2010-01-05 2010-01-05 Oscillation mirror element
US (1) US8867114B2 (en)
EP (1) EP2523034A1 (en)
JP (1) JP2011141333A (en)
KR (1) KR20120120180A (en)
CN (1) CN102713722A (en)
TW (1) TW201140140A (en)
WO (1) WO2011083701A1 (en)
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2010-12-24 EP EP20100842214 patent/EP2523034A1/en not_active Withdrawn
2010-12-24 CN CN201080060757XA patent/CN102713722A/en not_active Application Discontinuation
2010-12-24 KR KR1020127016484A patent/KR20120120180A/en not_active Application Discontinuation
2010-12-24 US US13/520,411 patent/US8867114B2/en not_active Expired - Fee Related
2010-12-24 WO PCT/JP2010/073305 patent/WO2011083701A1/en active Application Filing
2011-01-03 TW TW100100031A patent/TW201140140A/en unknown
JPN6011016572; ＴＡＮＩ，　Ｍａｓａｎａｏ　ｅｔ　ａｌ．: 'Ａ　Ｔｗｏ-Ａｘｉｓ　Ｐｉｅｚｏｅｌｅｃｔｒｉｃ　Ｔｉｌｉｔｉｎｇ　Ｍｉｃｒｏｍｉｒｒｏｒ　ｗｉｔｈ　ａ　Ｎｅｗｌｙ　Ｄｅｖｅｌｏｐｅｄ　ＰＺＴ-Ｍｅａｎｄｅｒｉｎｇ　Ａｃｔｕａｔｏｒ' Ｔｅｃｈｎｉｃａｌ　Ｄｉｇｅｓｔ　ｏｆ　２０ｔｈ　ＩＥＥＥ　Ｉｎｔｅｒｎａｔｉｏｎａｌ　Ｃｏｎｆｅｒｅｎｃｅ　ｏｎ　Ｍｉｃｒｏ　Ｅｌｅｃｔｒｏ　Ｍｅｃｈａｎｉｃａｌ　Ｓｙｓｔｅｍｓ　（ＭＥＭＳ　２００ , 20070121, ｐ．６９９-７０２ *
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TW201140140A (en) 2011-11-16
CN102713722A (en) 2012-10-03
US8867114B2 (en) 2014-10-21
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EP2523034A1 (en) 2012-11-14
KR20120120180A (en) 2012-11-01
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2012-11-08 A711 Notification of change in applicant