Patent Publication Number: US-2023145171-A1

Title: Actuator device

Description:
TECHNICAL FIELD 
     An aspect of the disclosure relates to an actuator device formed of, for example, a Micro Electro Mechanical Systems (MEMS) device. 
     BACKGROUND ART 
     An actuator device is known as a MEMS device. The actuator device includes a support part, a first movable part, a frame-shaped second movable part that surrounds the first movable part, a first connecting part that connects the first movable part to the second movable part so that the first movable part can swing around a first axis, a second connecting part that connects the second movable part to the support part so that the second movable part can swing around a second axis orthogonal to the first axis, a coil provided in the second movable part, and a magnetic field generator that generates a magnetic field to act on the coil (see, for example, Patent Literature 1). 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Unexamined Patent Publication No. 2014-41234 
     SUMMARY OF INVENTION 
     Technical Problem 
     When a drive signal having a frequency equal to the resonant frequency of the first movable part around the first axis is input to the coil in the above-mentioned actuator device, the second movable part slightly vibrates around the first axis at this frequency. This vibration is transmitted to the first movable part through the first connecting part, so that the first movable part can swing around the first axis at this frequency. However, it is difficult to obtain a large driving force in such a driving method in comparison with a case where the first movable part is driven by, for example, a coil provided in the first movable part. It is conceivable to increase the number of turns of the coil to increase a driving force. However, since the size of the second movable part should be increased to ensure a space where the coil is arranged, it is difficult for the second movable part to vibrate. For this reason, the amount of current input to the coil needs to be increased to increase a driving force. Since the heating amount is also increased when the amount of current is increased in general, it is required to cope with the increase in the heating amount. Further, the improvement of reliability and the facilitation of manufacture are required for the above-mentioned actuator device. 
     An object of an aspect of the disclosure is to provide an actuator device that can suppress an increase in the heating amount even though the amount of current input to a coil is increased and can achieve the improvement of reliability and the facilitation of manufacture. 
     Solution to Problem 
     An actuator device according to an aspect of the disclosure includes a support part, a first movable part, a frame-shaped second movable part that is arranged so as to surround the first movable part, a first connecting part that connects the first movable part to the second movable part so that the first movable part can swing around a first axis, a second connecting part that connects the second movable part to the support part so that the first movable part can swing around the first axis by the vibration of the second movable part, a spiral coil that is provided in the second movable part, a magnetic field generator that generates a magnetic field to act on the coil, a first external terminal that is provided on the support part, and a first wiring that is connected to an inner end portion of the coil and the first external terminal. The first wiring includes a lead wiring that is connected to the first external terminal, and a straddle wiring that is provided on the second movable part so as to straddle the coil and is connected to the inner end portion of the coil and the lead wiring. The width of the straddle wiring is larger than the width of the coil, and the thickness of the straddle wiring is smaller than the thickness of the coil. 
     In this actuator device, the inner end portion of the coil and the lead wiring are connected to each other by the straddle wiring that is provided to the second movable part so as to straddle the coil. The width of the straddle wiring is larger than the width of the coil, and the thickness of the straddle wiring is smaller than the thickness of the coil. Accordingly, since the wiring resistance of the straddle wiring can be reduced, an increase in the heating amount can be suppressed even though the amount of current input to the coil is increased. Further, since the width of the straddle wiring is larger than the width of the coil, the straddle wiring can be stably arranged. Accordingly, reliability can be improved. Furthermore, since the thickness of the straddle wiring is smaller than the thickness of the coil, the formation of irregularities on the surface of the second movable part caused by the straddle wiring can be suppressed. Accordingly, manufacture can be facilitated. Therefore, according to the actuator device, an increase in the heating amount can be suppressed even though the amount of current input to the coil is increased, and the improvement of reliability and the facilitation of manufacture can be achieved. 
     In the actuator device according to the aspect of the disclosure, the length of a contact region between the coil and the straddle wiring may be larger than the width of the coil. In this case, contact resistance between the coil and the straddle wiring can be reduced, so that an increase in the heating amount can be effectively suppressed. 
     In the actuator device according to the aspect of the disclosure, the width of a contact portion between the lead wiring and the straddle wiring may be larger than the width of the coil. In this case, contact resistance between the lead wiring and the straddle wiring can be reduced, so that an increase in the heating amount can be more effectively suppressed. 
     In the actuator device according to the aspect of the disclosure, the cross-sectional area of the straddle wiring may be larger than the cross-sectional area of the coil. In this case, an increase in the heating amount can be still more effectively suppressed. 
     In the actuator device according to the aspect of the disclosure, the width of the straddle wiring may be larger than the width of an arrangement region of the coil. According to this, an increase in the heating amount can be still more effectively suppressed. 
     In the actuator device according to the aspect of the disclosure, the coil may be embedded in the second movable part, and the straddle wiring may be formed in the shape of a flat layer and may extend so as to straddle the upper side of the coil. In this case, the coil can be stably arranged, so that reliability can be further improved. Furthermore, since the formation of irregularities on the surface of the second movable part caused by the straddle wiring can be effectively suppressed, manufacture can be further facilitated. 
     In the actuator device according to the aspect of the disclosure, the coil may be arranged on the second movable part and the straddle wiring may extend between the coil and the second movable part so as to straddle the lower side of the coil. In this case, the straddle wiring can be protected. 
     The actuator device according to the aspect of the disclosure may further include a second external terminal that is provided on the support part and a second wiring that is connected to an outer end portion of the coil and the second external terminal. The actuator device may include a pair of the second connecting parts, the first wiring may extend to the first external terminal from the inner end portion of the coil through one of the pair of the second connecting parts, and the second wiring may extend to the second external terminal from the outer end portion of the coil through the other of the pair of the second connecting parts. In this case, since the first wiring passes through one second torsion bar and the second wiring passes through the other second connecting part, the heating amount can be uniformized between the pair of the second connecting parts in comparison with, for example, a case where both the first wiring and the second wiring pass through one second connecting part. 
     In the actuator device according to the aspect of the disclosure, the second movable part may be provided with a dummy coil for adjusting a mass balance with the coil at a position to which the coil virtually extends spirally from the inner end portion. In this case, the mass balance of the second movable part can be improved. 
     In the actuator device according to the aspect of the disclosure, the second movable part may be provided with a dummy straddle wiring for adjusting a mass balance with the straddle wiring. In this case, the mass balance of the second movable part can be improved. 
     In the actuator device according to the aspect of the disclosure, the dummy straddle wiring may be arranged symmetrically to the straddle wiring with respect to the center of the second movable part when viewed in a direction orthogonal to a plane where the coil is arranged. In this case, the mass balance of the second movable part can be effectively improved. 
     The actuator device according to the aspect of the disclosure may include a pair of the coils, and the pair of the coils may be alternately arranged side by side in a width direction of the second movable part when viewed in a direction orthogonal to a plane where the coils are arranged. In this case, the first movable part can be suitably driven. 
     In the actuator device according to the aspect of the disclosure, one of the pair of the coils may be arranged at a position to which the other of the pair of the coils virtually extends spirally from the inner end portion. In this case, one of the pair of the coils can be arranged closer to the outside, so that a driving force can be increased. 
     In the actuator device according to the aspect of the disclosure, the second connecting part may connect the second movable part to the support part so that the second movable part can swing around a second axis orthogonal to the first axis. In this case, the second movable part can swing around the second axis together with the first movable part. 
     In the actuator device according to the aspect of the disclosure, the first wiring at the support part may include a plurality of wiring portions that are connected in parallel to each other. In this case, the wiring resistance at the first wiring of the support part can be reduced, so that an increase in the heating amount can be still more effectively suppressed. 
     The actuator device according to the aspect of the disclosure may further include a pair of wires that is connected to the first external terminal and leads to the outside. In this case, the wiring resistance of the wires led out of the first external terminal can be reduced, so that an increase in the heating amount can be still more effectively suppressed. 
     Advantageous Effects of Invention 
     According to an aspect of the disclosure, it is possible to provide an actuator device that can suppress an increase in the heating amount even though the amount of current input to a coil is increased and can achieve the improvement of reliability and the facilitation of manufacture. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a plan view of an actuator device according to an embodiment. 
         FIG.  2    is an enlarged plan view of a part of  FIG.  1   . 
         FIG.  3    is a cross-sectional view taken along line III-III illustrated in  FIG.  2   . 
         FIG.  4    is a schematic diagram for describing dummy coils. 
         FIG.  5    is a plan view schematically illustrating a position where the dummy coils are arranged. 
         FIG.  6    is an enlarged plan view of a portion denoted in  FIG.  5    by reference character A. 
         FIG.  7    is a plan view illustrating a portion of a support part positioned near a first wiring. 
         FIG.  8    is a cross-sectional view illustrating a modification. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     An embodiment of the disclosure will be described in detail below with reference to the drawings. Meanwhile, in the following description, the same or corresponding elements are denoted by the same reference numerals and the repeated description thereof will be omitted. 
     As illustrated in  FIG.  1   , an actuator device  1  includes a support part  2 , a first movable part  3 , a second movable part  4 , a pair of first torsion bars  5  and  6 , a pair of second torsion bars  7  and  8 , and a magnetic field generator  9 . The support part  2 , the first movable part  3 , the second movable part  4 , the pair of first torsion bars (first connecting parts)  5  and  6 , and the pair of second torsion bars (second connecting parts)  7  and  8  are integrally formed by, for example, a Silicon on Insulator (SOI) substrate. That is, the actuator device  1  is formed of a MEMS device. In the actuator device  1 , the first movable part  3  provided with a minor surface  10  is made to swing around each of an X axis (first axis) and a Y axis (second axis orthogonal to the first axis) orthogonal to each other. The actuator device  1  is used for, for example, an optical switch for optical communication, an optical scanner, and the like. The actuator device  1  is manufactured using a MEMS technology (patterning, etching, and the like). 
     The magnetic field generator  9  is formed of permanent magnets and the like arranged in a Halbach array. The magnetic field generator  9  generates, for example, a magnetic field in a direction D inclined with respect to each of the X axis and the Y axis by an angle of 45° in plan view (when viewed in a direction orthogonal to the X axis and the Y axis), and causes the magnetic field to act on a coil  14  to be described later. The direction D of the magnetic field generated by the magnetic field generator  9  may be inclined with respect to the X axis and the Y axis by an angle other than 45° in plan view. 
     The support part  2  has, for example, a rectangular outer shape in plan view and is formed in the shape of a frame. The support part  2  is arranged on one side of the magnetic field generator  9  in the direction orthogonal to the X axis and the Y axis. The first movable part  3  is arranged inside the support part  2  in a state where the first movable part  3  is spaced from the magnetic field generator  9 . The first movable part  3  includes a body portion  3   a,  a ring shape portion  3   b,  and a pair of connecting portions  3   c.    
     The body portion  3   a  has a circular shape in plan view, but may be formed in any shape, such as an elliptical shape, a rectangular shape, or a rhombic shape. The center P of the body portion  3   a  in plan view coincides with the intersection of the X axis and the Y axis. The minor surface  10  is provided on the surface of the body portion  3   a  opposite to the magnetic field generator by a metal film made of, for example, aluminum. The mirror surface  10  is provided over the entire surface of the body portion, but may be provided on only a part of the surface of the body portion. The ring shape portion  3   b  is formed in a ring shape so as to surround the body portion  3   a  in plan view. The ring shape portion  3   b  has an octagonal outer shape in plan view, but may have any outer shape, such as a circular shape, an elliptical shape, a rectangular shape, or a rhombic shape. The pair of connecting portions  3   c  is arranged on both sides of the body portion  3   a  on the Y axis, and connects the body portion  3   a  to the ring shape portion  3   b.    
     The second movable part  4  is formed in the shape of a frame, and is arranged inside the support part  2  so as to surround the first movable part  3  in a state where the second movable part  4  is spaced from the magnetic field generator  9 . The second movable part  4  includes a pair of first connection portions  41 A and  41 B, a pair of second connection portions  42 A and  42 B, a pair of first linear portions  43 A and  43 B, a pair of second linear portions  44 A and  44 B, a pair of third linear portions  45 A and  45 B, and a pair of fourth linear portions  46 A and  46 B. The second movable part  4  has a shape symmetrical with respect to each of the X axis and the Y axis in plan view. In the following description, symmetry with respect to the X axis or the Y axis means symmetry in plan view. 
     The first connection portions  41 A and  41 B are positioned on both sides of the first movable part  3  in an X-axis direction (first axis direction) parallel to the X axis. That is, each of the first connection portions  41 A and  41 B includes a portion facing the first movable part  3  in the X-axis direction in plan view. Each of the first connection portions  41 A and  41 B extends in a Y-axis direction. 
     The second connection portions  42 A and  42 B are positioned on both sides of the first movable part  3  in the Y-axis direction (second axis direction) parallel to the Y axis. That is, each of the second connection portions  42 A and  42 B includes a portion facing the first movable part  3  in the Y-axis direction in plan view. Each of the second connection portions  42 A and  42 B extends in the X-axis direction. An inner edge  51  of each of the second connection portions  42 A and  42 B in plan view includes a depression portion  52  recessed in the Y-axis direction, and an outer edge  53  of each of the second connection portions  42 A and  42 B in plan view includes a protrusion portion  54  protruding in the Y-axis direction. The depression portion  52  and the protrusion portion  54  are positioned on the Y axis in plan view. 
     In plan view, the width of each of the second connection portions  42 A and  42 B is larger than the width (maximum width) W 1  of a portion of the second movable part  4  other than the first connection portions  41 A and  41 B and the second connection portions  42 A and  42 B. That is, the width of each of the second connection portions  42 A and  42 B is the minimum width W 2  on the Y axis, but the minimum width W 2  is larger than the width W 1 . Further, the minimum width W 2  of each of the second connection portions  42 A and  42 B is larger than the width (maximum width) W 3  of each of the first connection portions  41 A and  41 B. The width W 3  of each of the first connection portions  41 A and  41 B is larger than the width W 1 , but may be equal to the width W 1  or may be smaller than the width W 1 . A boundary between the first connection portion  41 A and the first torsion bar  5  is illustrated in  FIG.  1    by a one-dot chain line B. The width of a certain portion of the second movable part  4  is a distance between the inner edge and the outer edge of this portion in plan view, that is, is the width of this portion in a direction (width direction) orthogonal to a direction orthogonal to the X axis and the Y axis and a direction orthogonal to the extending direction of this portion. 
     The first linear portions  43 A and  43 B are positioned on both sides of the second connection portion  42 A in the X-axis direction, and are connected to the second connection portion  42 A. Each of the first linear portions  43 A and  43 B extends in the X-axis direction. The first linear portions  43 A and  43 B are arranged symmetrically to each other with respect to the Y axis. The second linear portions  44 A and  44 B are positioned on both sides of the second connection portion  42 B in the X-axis direction, and are connected to the second connection portion  42 B. Each of the second linear portions  44 A and  44 B extends in the X-axis direction. The second linear portions  44 A and  44 B are arranged symmetrically to each other with respect to the Y axis. 
     The third linear portions  45 A and  45 B are positioned on the sides of the respective first linear portions  43 A and  43 B opposite to the second connection portion  42 A, and are connected to the first linear portions  43 A and  43 B and the first connection portions  41 A and  41 B. The third linear portion  45 A extends in a direction inclined with respect to each of the X axis and the Y axis by an angle of 45° in plan view. The third linear portion  45 B extends symmetrically to the third linear portion  45 A with respect to the Y axis. 
     The fourth linear portions  46 A and  46 B are positioned on the sides of the respective second linear portions  44 A and  44 B opposite to the second connection portion  42 B, and are connected to the second linear portions  44 A and  44 B and the first connection portions  41 A and  41 B. The fourth linear portion  46 A extends symmetrically to the third linear portion  45 A with respect to the X axis. The fourth linear portion  46 B extends symmetrically to the fourth linear portion  46 A with respect to the Y axis, and extends symmetrically to the third linear portion  45 B with respect to the X axis. 
     The first torsion bars  5  and  6  are arranged on both sides of the first movable part  3  on the X axis. The first torsion bars  5  and  6  connect the first movable part  3  (ring shape portion  3   b ) to the second movable part  4  on the X axis so that the first movable part  3  can swing around the X axis (around the X axis as a center line). The first torsion bars  5  and  6  are connected to the second movable part  4  at the first connection portions  41 A and  41 B. Each of the first torsion bars  5  and  6  extends linearly along the X axis. In this embodiment, for a reduction in stress acting on the first torsion bars  5  and  6 , the width (width in the Y-axis direction) of an end portion of each of the first torsion bars  5  and  6  close to the first movable part  3  increases as approaching the first movable part  3 , and the width (width in the Y-axis direction) of an end portion of each of the first torsion bars  5  and  6  close to the second movable part  4  increases as approaching the second movable part  4 . 
     The second torsion bars  7  and  8  are arranged on both sides of the second movable part  4  on the Y axis. The second torsion bars  7  and  8  connect the second movable part  4  to the support part  2  on the Y axis so that the second movable part  4  can swing around the Y axis (around the Y axis as a center line). The second torsion bars  7  and  8  are connected to the second movable part  4  at the second connection portions  42 A and  42 B. Each of the second torsion bars  7  and  8  extends meanderingly in plan view. Each of the second torsion bars  7  and  8  includes a plurality of linear portions  11  and a plurality of folded portions  12 . The linear portions  11  extend in the Y-axis direction, and are arranged side by side in the X-axis direction. The folded portions  12  alternately connect both ends of the adjacent linear portions  11 . 
     The actuator device  1  further includes a pair of coils  14  and  15 , a first wiring  21 , a second wiring  22 , a third wiring  23 , a fourth wiring  24 , a first external terminal  25 , a second external terminal  26 , a third external terminal  27 , a fourth external terminal  28 , and four pairs of wires  29 . Each of the coils  14  and  15  is provided in the second movable part  4  so as to surround the first movable part  3 , and has a spiral shape in plan view (when viewed in a direction orthogonal to a plane where the respective coils  14  and  15  are arranged). The respective coils  14  and  15  are arranged along a plane including the X axis and the Y axis. Each of the coils  14  and  15  is wound around the first movable part  3  a plurality of times. The pair of coils  14  and  15  is alternately arranged side by side in the width direction of the second movable part  4  in plan view. 
     An arrangement region R where the coils  14  and  15  are arranged is illustrated in  FIG.  1    by hatching. Each of the coils  14  and  15  extends in the extending directions of the first connection portions  41 A and  41 B and the respective linear portions  43 A to  46 B at the first connection portions  41 A and  41 B and the respective linear portions  43 A to  46 B. At the first connection portions  41 A and  41 B and the respective linear portions  43 A to  46 B, the outer edge of the arrangement region R extends along the outer edges of the first connection portions  41 A and  41 B and the respective linear portions  43 A to  46 B and the inner edge of the arrangement region R extends along the inner edges of the first connection portions  41 A and  41 B and the respective linear portions  43 A to  46 B. 
     The arrangement region R in each of the second connection portions  42 A and  42 B includes a first portion  55 , a pair of second portions  56 , and a pair of third portions  57  (see  FIG.  2   ). The first portion  55  extends in the X-axis direction, and crosses the Y axis in plan view. The pair of second portions  56  is positioned on both sides of the first portion  55  in the X-axis direction, and is connected to the first portion  55 . One second portion  56  extends in the direction inclined with respect to each of the X axis and the Y axis by an angle of 45°. The other second portion  56  extends symmetrically to one second portion  56  with respect to the Y axis. The first portion  55  is arranged at a position closer to the outer edge  53  than the inner edge  51  of the second connection portion  42 A. The pair of third portions  57  is positioned on the sides of the respective second portions  56  opposite to the first portion  55 , and is connected to the pair of second portions  56  and the arrangement region R in the first linear portions  43 A and  43 B. Each third portion  57  extends in the X-axis direction. The first movable part  3  is not provided with the coils. A direction where one second portion  56  extends may be inclined with respect to the X axis and the Y axis by an angle other than 45°. 
     Each of the external terminals  25  to  28  is, for example, an electrode pad provided on the support part  2  and is exposed to the outside from an insulating layer  35 . The insulating layer  35  is integrally formed so as to cover the surfaces (surfaces opposite to the magnetic field generator  9 ) of the support part  2 , the first movable part  3 , the second movable part  4 , the first torsion bars  5  and  6 , and the second torsion bars  7  and  8 . One pair of wires  29  is electrically connected to each of the external terminals  25  to  28 . Each wire  29  is led out of the actuator device  1  to the outside. Each of the external terminals  25  to  28  is electrically connected to a drive source, which is arranged outside the actuator device  1 , via the wires  29 . 
     The first wiring  21  is electrically connected to the inner end portion of the coil  14  and the first external terminal  25 . The first wiring  21  extends to the first external terminal  25  from the inner end portion of the coil  14  through the second torsion bar  7 . The second wiring  22  is electrically connected to the outer end portion of the coil  14  and the second external terminal  26 . The second wiring  22  is connected to the outer end portion of the coil  14  on, for example, the Y axis. The second wiring  22  extends to the second external terminal  26  from the outer end portion of the coil  14  through the second torsion bar  8 . 
     The third wiring  23  is electrically connected to the inner end portion of the coil  15  and the third external terminal  27 . The third wiring  23  extends to the third external terminal  27  from the inner end portion of the coil  15  through the second torsion bar  7 . The fourth wiring  24  is electrically connected to the outer end portion of the coil  15  and the fourth external terminal  28 . The fourth wiring  24  is connected to the outer end portion of the coil  15  on, for example, the Y axis. The fourth wiring  24  extends to the fourth external terminal  28  from the outer end portion of the coil  15  through the second torsion bar  8 . 
     In the actuator device  1  having the above-mentioned configuration, when a drive signal for a linear operation is input to the coil  14  through the respective external terminals  25  and  26  and the respective wirings  21  and  22 , Lorentz force acts on the coil  14  due to an interaction between the drive signal and the magnetic field generated by the magnetic field generator  9 . The mirror surface  10  (first movable part  3 ) can be linearly operated around the Y axis together with the second movable part  4  using a balance between the Lorentz force and the elastic forces of the second torsion bars  7  and  8 . 
     On the other hand, when a drive signal for a resonant operation is input to the coil  15  through the respective external terminals  27  and  28  and the respective wirings  23  and  24 , Lorentz force acts on the coil  15  due to an interaction between the drive signal and the magnetic field generated by the magnetic field generator  9 . The mirror surface  10  (first movable part  3 ) can be operated to resonate around the X axis using the resonance of the first movable part  3  at a resonant frequency in addition to the Lorentz force. Specifically, when a drive signal having a frequency equal to the resonant frequency of the first movable part  3  around the X axis is input to the coil  15 , the second movable part  4  slightly vibrates around the X axis at this frequency. This vibration is transmitted to the first movable part  3  through the first torsion bars  5  and  6 , so that the first movable part  3  can swing around the X axis at this frequency. 
     Subsequently, a connection state of the coil  14  and the first wiring  21  and a connection state of the coil  15  and the third wiring  23  will be described in detail with reference to  FIGS.  1  to  3   . As illustrated in  FIG.  2   , an inner end portion  14   a  of the coil  14  extends to the Y axis on the second connection portion  42 A. The first wiring  21  includes a lead wiring  61  and a straddle wiring  62 . The lead wiring  61  is provided over the second movable part  4 , the second torsion bar  7 , and the support part  2 , and is electrically connected to the first external terminal  25 . The lead wiring  61  at the second movable part  4  is arranged closer to the outside than the coils  14  and  15  in plan view, and extends to an end portion of the second connection portion  42 A close to the first linear portion  43 A. An end portion  61   a  of the lead wiring  61  opposite to the first external terminal  25  faces the inner end portion  14   a  of the coil  14  in the width direction of the second movable part  4 . 
     The straddle wiring  62  is provided on the second movable part  4 , and is electrically connected to the inner end portion  14   a  of the coil  14  and the end portion  61   a  of the lead wiring  61 . The straddle wiring  62  is formed in the shape of a flat layer, and extends so as to straddle the upper side (one side of the coils  14  and  15  in the direction orthogonal to the X axis and the Y axis) of the coils  14  and  15 . That is, the straddle wiring  62  three-dimensionally crosses the coils  14  and  15 . The straddle wiring  62  is arranged at the end portion of the second connection portion  42 A close to the first linear portion  43 A so as to overlap with the end portion  61   a  of the lead wiring  61  and the inner end portion  14   a  of the coil  14  in plan view, and covers a part of the arrangement region R in the extending direction of the coils  14  and  15 . The straddle wiring  62  is illustrated in  FIGS.  1  and  2    by a solid line, but is actually covered with the insulating layer  35 . 
     The straddle wiring  62  includes a first portion  62   a  and a second portion  62   b  connected to the first portion  62   a.  The first portion  62   a  is positioned on one of the second portions  56  of the arrangement region R, and extends in the direction inclined with respect to each of the X axis and the Y axis by an angle of 45°. The second portion  62   b  is positioned on one of the third portions  57  of the arrangement region R, and extends in the X-axis direction. A direction where the first portion  62   a  extends may be inclined with respect to the X axis and the Y axis by an angle other than 45°. 
       FIG.  3    is a cross-sectional view taken along line III-III illustrated in  FIG.  2   . As illustrated in  FIG.  3   , the second movable part  4  is provided with groove portions  31  having shapes corresponding to the coils  14  and  15 . An insulating layer  32  is provided on the inner surfaces of the groove portions  31 , and an insulating layer  33  is provided on the insulating layer  32 . Each of the coils  14  and  15  is arranged in the groove portion  31  via the insulating layers  32  and  33 . That is, each of the coils  14  and  15  is embedded in the second movable part  4 . Each of the coils  14  and  15  is a damascene wiring formed by, for example, a damascene method so that a metal material, such as copper, is embedded in the groove portion  31 . An insulating layer  34  is provided so as to cover the coils  14  and  15  and the insulating layer  33 . An insulating layer  35  is provided on the insulating layer  34 . Each of the insulating layers  32  to  35  is made of, for example, silicon oxide, silicon nitride, silicon oxynitride, or the like. Each of the insulating layers  32  to  35  is integrally formed so as to cover the surfaces (surfaces opposite to the magnetic field generator  9 ) of the support part  2 , the first movable part  3 , the second movable part  4 , the pair of first torsion bars  5  and  6 , and the pair of second torsion bars  7  and  8 . 
     The lead wiring  61  is, for example, a damascene wiring formed in the same manner as the coils  14  and  15 . That is, the second movable part  4  is provided with a groove portion  36 , and the lead wiring  61  is arranged in the groove portion  36  via the insulating layers  32  and  33 . The lead wiring  61  is embedded in the second movable part  4 , and is covered with the insulating layers  34  and  35 . The lead wiring  61  has the same cross-sectional shape as the cross-sectional shape of each of the coils  14  and  15 , but may have a cross-sectional shape different from the cross-sectional shape of each of the coils  14  and  15 . The lead wiring  61  may be made of the same metal material as the metal material of each of the coils  14  and  15 , but may be made of a metal material different from the metal material of each of the coils  14  and  15 . 
     The straddle wiring  62  is provided on the insulating layer  34 , and is covered with the insulating layer  35 . The insulating layer  34  is provided with an opening  34   a  formed at a position corresponding to the inner end portion  14   a  of the coil  14  in plan view, and is provided with an opening  34   b  formed at a position corresponding to the end portion  61   a  of the lead wiring  61  in plan view. The straddle wiring  62  enters the respective openings  34   a  and  34   b,  and is connected to the inner end portion  14   a  and the end portion  61   a  through the openings  34   a  and  34   b . The straddle wiring  62  is made of a metal material (for example, aluminum or an aluminum-based alloy) different from the metal material of the lead wiring  61 , but may be made of the same metal material as the metal material of the lead wiring  61 . 
     The width W 4  of the straddle wiring  62  is larger than the width W 5  of each of the coils  14  and  15 . Further, the width W 4  of the straddle wiring  62  is larger than the width W 6  of the arrangement region R of the coils  14  and  15  (the total width of the coils  14  and  15 ). The width W 4  of the straddle wiring  62  is, for example, not less than 5 times and not more than 100 times the width W 5  of each of the coils  14  and  15 . The width W 4  of the straddle wiring  62  is the width of the straddle wiring  62  in a direction orthogonal to a direction from an end of the straddle wiring  62  that is connected to the inner end portion  14   a  of the coil  14  toward an end of the straddle wiring  62  that is connected to the end portion  61   a  of the lead wiring  61 . In other words, the width W 4  of the straddle wiring  62  is the width of the straddle wiring  62  in the extending direction of the coils  14  and  15 . When the straddle wiring  62  includes the first and second portions  62   a  and  62   b  extending in directions different from each other as in this embodiment, the width W 4  of the straddle wiring  62  is the sum of the width of the first portion  62   a  and the width of the second portion  62   b.  The same applies to a straddle wiring  64  to be described later. The width of each of the coils  14  and  15  is the width of one conductor, which forms each of the coils  14  and  15 , in a direction orthogonal to the extending direction of the coils  14  and  15 . The widths of the coils  14  and  15  are equal to each other in this embodiment, but may be different from each other. 
     The thickness T 1  of the straddle wiring  62  is smaller than the thickness T 2  of each of the coils  14  and  15 . The cross-sectional area of the straddle wiring  62  is larger than the cross-sectional area of each of the coils  14  and  15 . The thickness of the straddle wiring  62  or the coils  14  and  15  is the thickness of the straddle wiring  62  or the coils  14  and  15  in a direction orthogonal to a plane where the coils  14  and  15  are arranged. The thicknesses of the coils  14  and  15  are equal to each other in this embodiment, but the thicknesses of the coils  14  and  15  may be different from each other. The cross-sectional area of the straddle wiring  62  is the cross-sectional area of the straddle wiring  62  in a cross-section orthogonal to the direction from the end of the straddle wiring  62  that is connected to the inner end portion  14   a  of the coil  14  toward the end of the straddle wiring  62  that is connected to the end portion  61   a  of the lead wiring  61 . In other words, the cross-sectional area of the straddle wiring  62  is the cross-sectional area of the straddle wiring  62  in a cross-section orthogonal to the width direction of the second movable part  4 . In this embodiment, the cross-sectional area of the straddle wiring  62  is the sum of the cross-sectional area of the first portion  62   a  and the cross-sectional area of the second portion  62   b . The same applies to a straddle wiring  64  to be described later. The cross-sectional area of each of the coils  14  and  15  is the cross-sectional area of each of the coils  14  and  15  in a cross-section orthogonal to the extending direction of the coils  14  and  15 . 
     The length L 1  of a contact region between the straddle wiring  62  and the coil  14  is larger than the width W 5  of each of the coils  14  and  15 . That is, the opening  34   a  is provided in the insulating layer  34  over a range denoted in  FIG.  2    by reference numeral L 1 , and the straddle wiring  62  and the coil  14  are in contact with each other in the range. The contact region between the straddle wiring  62  and the coil  14  extends in the extending direction of the coils  14  and  15 . The length L 2  of a contact region between the straddle wiring  62  and the lead wiring  61  is larger than the width W 5  of each of the coils  14  and  15 . That is, the opening  34   b  is provided in the insulating layer  34  over a range denoted in  FIG.  2    by reference numeral L 2 , and the straddle wiring  62  and the lead wiring  61  are in contact with each other in the range. The contact region between the straddle wiring  62  and the lead wiring  61  extends in the extending direction of the coils  14  and  15 . 
     The connection state of the third wiring  23  and the coil  15  is the same as the connection state of the first wiring  21  and the coil  14 . As illustrated in  FIG.  2   , an inner end portion  15   a  of the coil  15  extends to the vicinity of a boundary between the first linear portion  43 B and the third linear portion  45 B. The third wiring  23  includes a lead wiring  63  and a straddle wiring  64 . The lead wiring  63  is provided over the second movable part  4 , the second torsion bar  7 , and the support part  2 , and is electrically connected to the third external terminal  27 . The lead wiring  63  of the second movable part  4  is arranged closer to the outside than the coils  14  and  15  in plan view, and extends to an end portion of the second connection portion  42 A close to the first linear portion  43 B. An end portion  63   a  of the lead wiring  63  opposite to the third external terminal  27  faces the inner end portion  15   a  of the coil  15  in the width direction of the second movable part  4 . The lead wiring  63  is formed of a damascene wiring as with the lead wiring  61 . 
     The straddle wiring  64  is provided on the second movable part  4 , and is electrically connected to the inner end portion  15   a  of the coil  15  and the end portion  63   a  of the lead wiring  63 . The straddle wiring  64  is formed in the shape of a flat layer, and extends so as to straddle the upper side of the coils  14  and  15 . The straddle wiring  64  is arranged at the end portion of the second connection portion  42 A close to the first linear portion  43 B so as to overlap with the end portion  63   a  of the lead wiring  63  and the inner end portion  15   a  of the coil  15  in plan view, and covers a part of the arrangement region R in the extending direction of the coils  14  and  15 . The straddle wiring  64  is arranged symmetrically to the straddle wiring  62  with respect to the Y axis. As with the straddle wiring  62 , the straddle wiring  64  is connected to the inner end portion  15   a  and the end portion  63   a  through openings provided in the insulating layer  35 . The straddle wiring  64  is illustrated in  FIGS.  1  and  2    by a solid line, but is actually covered with the insulating layer  35 . 
     The width W 7  of the straddle wiring  64  is larger than the width W 5  of each of the coils  14  and  15 . Further, the width W 7  of the straddle wiring  64  is larger than the width W 6  of the arrangement region R of the coils  14  and  15 . The thickness of the straddle wiring  64  is equal to the thickness T 1  of the straddle wiring  62 , and is smaller than the thickness T 2  of each of the coils  14  and  15 . The cross-sectional area of the straddle wiring  64  is larger than the cross-sectional area of each of the coils  14  and  15 . 
     The length L 3  of a contact region between the straddle wiring  64  and the coil  15  is larger than the width W 5  of each of the coils  14  and  15 . The length L 4  of a contact region between the straddle wiring  64  and the lead wiring  61  is larger than the width W 5  of each of the coils  14  and  15 . Each of the second and fourth wirings  22  and  24  is formed of a damascene wiring similarly to the lead wirings  61  and  63  for example. 
     As illustrated in  FIG.  1   , the second movable part  4  is provided with a pair of dummy straddle wirings  65  and  66 . The dummy straddle wiring  65  is arranged point symmetrically to the straddle wiring  64  with respect to the center of the second movable part  4  in plan view. The dummy straddle wiring  65  is provided to adjust a mass balance and a stiffness balance with the straddle wiring  64 . The dummy straddle wiring  66  is arranged point symmetrically to the straddle wiring  62  with respect to the center of the second movable part  4  in plan view. The dummy straddle wiring  66  is provided to adjust a mass balance and a stiffness balance with the straddle wiring  62 . In this embodiment, the center of the second movable part  4  in plan view coincides with the center P of the body portion  3   a  (the intersection of the X axis and the Y axis). 
     The dummy straddle wirings  65  and  66  have configurations corresponding to the straddle wirings  62  and  64 . That is, each of the dummy straddle wirings  65  and  66  is formed in the shape of a flat layer, and is arranged between the insulating layers  34  and  35  so as to straddle the upper side of the coils  14  and  15 . However, each of the dummy straddle wirings  65  and  66  is not electrically connected to the coils  14  and  15 . That is, the openings  34   a  and  34   b  are not provided in the insulating layer  34  at positions where the dummy straddle wirings  65  and  66  are formed. 
     As illustrated in  FIGS.  4  to  6   , the second movable part  4  is provided with a pair of dummy coils  67  and  68  and a pair of dummy coils  71  and  72 . The coils  14  and  15  are hatched in  FIGS.  4  and  6   , but  FIGS.  4  and  6    do not illustrate a cross-section. 
     The dummy coil  67  is arranged at a position to which the coil  14  virtually extends spirally from the inner end portion  14   a.  The dummy coil  67  is provided to adjust a mass balance and a stiffness balance with the coil  14 . The dummy coil  67  has a configuration corresponding to the coil  14 , and is embedded in the second movable part  4 . The dummy coil  67  is not electrically connected to the coil  14 , but may be electrically connected to the coil  14 . As illustrated in  FIG.  5   , the dummy coil  67  extends to the vicinity of a boundary between the second and fourth linear portions  44 A and  46 A from the Y axis on the second connection portion  42 A through the first linear portion  43 B, the third linear portion  45 B, the first connection portion  41 B, the fourth linear portion  46 B, the second linear portion  44 B, the second connection portion  42 B, and the second linear portion  44 A. 
     The dummy coil  68  is arranged at a position to which the coil  15  virtually extends spirally from the inner end portion  15   a.  The dummy coil  68  is provided to adjust a mass balance and a stiffness balance between itself and the coil  15 . The dummy coil  68  has a configuration corresponding to the coil  15 , and is embedded in the second movable part  4 . The dummy coil  68  is not electrically connected to the coil  15 , but may be electrically connected to the coil  15 . As illustrated in  FIG.  5   , the dummy coil  68  extends to the vicinity of a boundary between the second and fourth linear portions  44 B and  46 B from the vicinity of an end portion of the third linear portion  45 B, which is close to the first linear portion  43 B, through the first connection portion  41 B and the fourth linear portion  46 B. 
     As illustrated in  FIG.  5   , the dummy coil  71  is arranged symmetrically to the outer end portion of the coil  14  with respect to the Y axis in plan view. The dummy coil  71  is provided to adjust a mass balance and a stiffness balance with the coil  14 . The dummy coil  71  has a configuration corresponding to the coil  14 , and is embedded in the second movable part  4 . The dummy coil  71  is not electrically connected to the coil  14 , but may be electrically connected to the coil  14 . The dummy coil  72  is arranged symmetrically to the outer end portion of the coil  15  with respect to the Y axis in plan view. The dummy coil  72  is provided to adjust a mass balance and a stiffness balance with the coil  15 . The dummy coil  72  has a configuration corresponding to the coil  15 , and is embedded in the second movable part  4 . The dummy coil  72  is not electrically connected to the coil  15 , but may be electrically connected to the coil  15 . 
     As illustrated in  FIG.  6   , the coil  14  is wound around the first movable part  3  a plurality of times at a position closer to the inside than the inner end portion  15   a  of the coil  15 . The reason for this is that the amount of current input to the coil  14  is different from the amount of current input to the coil  15  and the number of turns of the coil  14  is larger than the number of turns of the coil  15 . At a position closer to the inside than the inner end portion  15   a  of the coil  15 , the coil  14  is arranged not only at a position where the coil  14  should be originally arranged but also at a position to which the coil  15  virtually extends spirally from the inner end portion  15   a.  In other words, the coil  14  is arranged even in an empty space that is formed since the coil  15  does not extend. The respective dummy coils  67  and  68  are arranged closer to the inside than the coils  14  and  15  in plan view. 
     As illustrated in  FIG.  7   , the first wiring  21  (lead wiring  61 ) at the support part  2  includes a plurality of (in this example, three) wiring portions  21   a  that are connected in parallel to each other. The wiring portions  21   a  are formed in, for example, a linear shape and are arranged side by side so as to be adjacent to each other in the width direction. Each wiring portion  21   a  is formed of a damascene wiring, but may be a wire arranged on the surface of the support part  2 . Although not illustrated, each of the wirings  22  to  24  of the support part  2  includes a plurality of (in this example, three) wiring portions that are connected in parallel to each other similarly to the first wiring  21 . 
     As described above, in the actuator device  1 , the inner end portion  14   a  of the coil  14  and the lead wiring  61  are connected to each other by the straddle wiring  62  that is provided on the second movable part  4  so as to straddle the coils  14  and  15 . The width W 4  of the straddle wiring  62  is larger than the width W 5  of each of the coils  14  and  15 , and the thickness T 1  of the straddle wiring  62  is smaller than the thickness T 2  of each of the coils  14  and  15 . Likewise, the inner end portion  15   a  of the coil  15  and the lead wiring  63  are connected to each other by the straddle wiring  64  that is provided on the second movable part  4  so as to straddle the coils  14  and  15 . The width W 7  of the straddle wiring  64  is larger than the width W 5  of each of the coils  14  and  15 , and the thickness of the straddle wiring  64  is smaller than the thickness T 2  of each of the coils  14  and  15 . Accordingly, since the wiring resistance of the straddle wirings  62  and  64  can be reduced, an increase in the heating amount can be suppressed even though the amounts of current input to the coils  14  and  15  are increased. Further, since the width W 4  of the straddle wiring  62  and the width W 7  of the straddle wiring  64  are larger than the width W 5  of each of the coils  14  and  15  and the ground contact areas of the straddle wirings  62  and  64  are large, the separation of the straddle wirings  62  and  64  can be suppressed. As a result, since the straddle wirings  62  and  64  can be stably arranged, reliability can be improved. Furthermore, since the thickness T 1  of each of the straddle wirings  62  and  64  is smaller than the thickness T 2  of each of the coils  14  and  15 , the formation of irregularities on the surface of the second movable part  4  caused by the straddle wirings  62  and  64  can be suppressed. Accordingly, reliability can be improved and manufacture can be facilitated. Therefore, according to the actuator device  1 , an increase in the heating amount can be suppressed even though the amounts of current input to the coils  14  and  15  are increased, and manufacture can be facilitated. Meanwhile, when the width W 4  of the straddle wiring  62  and the width W 7  of the straddle wiring  64  are large and the areas of the straddle wirings  62  and  64  in plan view are large, since parasitic capacitance is increased, there is a possibility that spike noise is generated during driving. However, good characteristics are obtained in the actuator device  1  by an intentional increase in the width W 4  of the straddle wiring  62  and the width W 7  of the straddle wiring  64 . 
     In the actuator device  1 , the length L 1  of the contact region between the coil  14  and the straddle wiring  62  is larger than the width W 5  of each of the coils  14  and  15 . Likewise, the length L 3  of the contact region between the coil  15  and the straddle wiring  64  is larger than the width W 5  of each of the coils  14  and  15 . Accordingly, contact resistance between the coils  14  and  15  and the straddle wirings  62  and  64  can be reduced, so that an increase in the heating amount can be effectively suppressed. 
     In the actuator device  1 , the length L 3  of the contact region between the lead wiring  61  and the straddle wiring  62  is larger than the width W 5  of each of the coils  14  and  15 . Likewise, the length L 4  of the contact region between the lead wiring  63  and the straddle wiring  64  is larger than the width W 5  of each of the coils  14  and  15 . Accordingly, contact resistance between the lead wirings  61  and  63  and the straddle wirings  62  and  64  can be reduced, so that an increase in the heating amount can be effectively suppressed. 
     In the actuator device  1 , the cross-sectional areas of the straddle wirings  62  and  64  are larger than the cross-sectional areas of the coils  14  and  15 . Accordingly, an increase in the heating amount can be still more effectively suppressed. 
     In the actuator device  1 , the width W 4  of the straddle wiring  62  and the width W 7  of the straddle wiring  64  are larger than the width W 6  of the arrangement region R of the coils  14  and  15 . Accordingly, an increase in the heating amount can be still more effectively suppressed. 
     Since the coils  14  and  15  are embedded in the second movable part  4  in the actuator device  1 , the respective straddle wirings  62  and  64  are formed in the shape of a flat layer and extend so as to straddle the upper side of the coils  14  and  15 . Accordingly, since the coils  14  and  15  can be stably arranged, reliability can be further improved. Further, since the formation of irregularities on the surface of the second movable part  4  caused by the straddle wiring  62  can be effectively suppressed, manufacture can be further facilitated. Furthermore, since a process for planarizing the surfaces of the second movable part  4  and the coils  14  and  15  can be performed after the coils  14  and  15  are embedded in the second movable part  4 , the straddle wirings  62  and  64  can be formed on the flat surface. Accordingly, manufacture can be further facilitated. Even though the surfaces of the second movable part  4  and the coils  14  and  15  are planarized, there is a case where irregularities slightly remain on the surfaces. In the actuator device  1 , even though the straddle wirings  62  and  64  are formed on such irregularities, since the width W 4  of the straddle wiring  62  and the width W 7  of the straddle wiring  64  are larger than the width W 5  of each of the coils  14  and  15  and the ground contact areas of the straddle wirings  62  and  64  are large, the separation of the straddle wirings  62  and  64  can be suppressed. Accordingly, the straddle wirings  62  and  64  can be stably arranged. 
     In the actuator device  1 , the first wiring  21  extends to the first external terminal  25  from the inner end portion  14   a  of the coil  14  through the second torsion bar  7  and the second wiring  22  extends to the second external terminal  26  from the outer end portion of the coil  14  through the second torsion bar  8 . Accordingly, since the first wiring  21  passes through the second torsion bar  7  and the second wiring  22  passes through the second torsion bar  8 , the heating amount can be uniformized between the second torsion bars  7  and  8  in comparison with, for example, a case where both the first wiring  21  and the second wiring  22  pass through the second torsion bar  7 . As a result, a change in the natural frequency or stiffness of the second movable part  4  caused by the deviation of heat distribution can be suppressed. 
     In the actuator device  1 , the second movable part  4  is provided with the dummy coil  67 , which is provided at a position to which the coil  14  virtually extends spirally from the inner end portion  14   a,  and adjusts a mass balance with the coil  14 , and the dummy coil  68 , which is provided at a position to which the coil  15  virtually extends spirally from the inner end portion  15   a,  and adjusts a mass balance with the coil  15 . Accordingly, the mass balance and the stiffness balance of the second movable part  4  can be improved. 
     In the actuator device  1 , the second movable part  4  is provided with the dummy straddle wiring  65  for adjusting a mass balance with the straddle wiring  62  and the dummy straddle wiring  66  for adjusting a mass balance with the straddle wiring  64 . Accordingly, the mass balance and the stiffness balance of the second movable part  4  can be improved. 
     In the actuator device  1 , the dummy straddle wiring  65  is arranged at a position symmetrical to the straddle wiring  62  with respect to the center of the second movable part  4  in plan view. Likewise, the dummy straddle wiring  66  is arranged at a position symmetrical to the straddle wiring  64  with respect to the center of the second movable part  4  in plan view. Accordingly, the mass balance and the stiffness balance of the second movable part  4  can be effectively improved. 
     In the actuator device  1 , the pair of coils  14  and  15  is alternately arranged side by side in the width direction of the second movable part  4  in plan view. Accordingly, the first movable part  3  can be suitably driven. 
     In the actuator device  1 , the coil  14  is arranged at a position to which the coil  15  virtually extends spirally from the inner end portion  15   a.  Accordingly, the coil  14  can be arranged closer to the outside, so that a driving force can be increased. 
     In the actuator device  1 , the second torsion bars  7  and  8  connect the second movable part  4  to the support part  2  so that the second movable part  4  can swing around the Y axis. Accordingly, the second movable part  4  can swing around the Y axis together with the first movable part  3 . 
     In the actuator device  1 , the first wiring  21  of the support part  2  includes the plurality of wiring portions  21   a  that are connected in parallel to each other. Accordingly, since the wiring resistance of the first wiring  21  of the support part  2  can be reduced, an increase in the heating amount can be still more effectively suppressed. 
     The actuator device  1  includes four pairs of wires  29  that are connected to the external terminals  25  to  28 , respectively, and lead to the outside. Accordingly, since the wiring resistance of the wires led out of the respective external terminals  25  to  28  can be reduced, an increase in the heating amount can be still more effectively suppressed. 
     One embodiment of the disclosure has been described above, but the disclosure is not limited to the embodiment. As in a modification illustrated in, for example,  FIG.  8   , the coils  14  and  15  and the lead wiring  61  may be arranged on the second movable part  4 . In this modification, the insulating layer  34  is provided on the surface of the second movable part  4  and the straddle wiring  62  is provided on the insulating layer  34 . The insulating layer  35  is provided on the insulating layer  34  so as to cover the straddle wiring  62 . The coils  14  and  15  and the lead wiring  61  are provided on the insulating layer  35 . That is, the coils  14  and  15  are arranged on the second movable part  4  via the insulating layers  34  and  35 , and the straddle wiring  62  extends between the coils  14  and  15  and the second movable part  4  so as to straddle the lower side of the coils  14  and  15 . 
     The insulating layer  35  is provided with an opening  35   a  formed at a position corresponding to the inner end portion  14   a  of the coil  14  in plan view, and is provided with an opening  35   b  formed at a position corresponding to the end portion  61   a  of the lead wiring  61  in plan view. The straddle wiring  62  enters the respective openings  35   a  and  35   b,  and is connected to the inner end portion  14   a  and the end portion  61   a  through the openings  35   a  and  35   b.  An insulating layer  37  is provided on the insulating layer  35  so as to cover the respective coils  14  and  15  and the lead wiring  61 . The insulating layer  37  is provided to protect the respective coils  14  and  15  and the lead wiring  61 . When the respective coils  14  and  15  and the lead wiring  61  are made of, for example, a corrosion-resistant metal material, such as gold, the insulating layer  35  may not be provided. As with the straddle wiring  62 , the straddle wiring  64  is also arranged between the coils  14  and  15  and the second movable part  4  so as to straddle the lower side of the coils  14  and  15 . 
     Even in this modification, as in the embodiment, an increase in the heating amount can be suppressed even though the amounts of current input to the coils  14  and  15  are increased, and reliability can be improved and manufacture can be facilitated. Further, since the coils  14  and  15  are arranged on the second movable part  4  and the straddle wirings  62  and  64  extend between the coils  14  and  15  and the second movable part  4  so as to straddle the lower side of the coils  14  and  15 , the straddle wirings  62  and  64  can be protected. Furthermore, since the thickness T 1  of each of the straddle wirings  62  and  64  is smaller than the thickness T 2  of each of the coils  14  and  15 , the coils  14  and  15  can be easily formed so as to straddle the upper side of the straddle wirings  62  and  64 . As a result, since the occurrence of damage or the like (for example, cracks) to the coils  14  and  15  can be suppressed, the reliability of the coils  14  and  15  can be improved. 
     The first and second movable parts  3  and  4  are linearly operated around the Y axis in the embodiment, but the first and second movable parts  3  and  4  may be operated to resonate around the Y axis. The second movable part  4  is provided with the pair of coils  14  and  15  in the embodiment, but the second movable part  4  may be provided with only one coil. Even in this case, the first movable part  3  can swing around the X axis and the second movable part  4  can swing around the Y axis by the input of a drive signal to the coil. When the second movable part  4  is provided with only the coil  14 , the respective wirings  23  and  24  and the respective external terminals  27  and  28  will be omitted, but a dummy straddle wiring for adjusting a mass balance with the straddle wiring  62  may be provided at a position where the straddle wiring  64  is arranged in the embodiment. That is, the second movable part  4  may be provided with a dummy straddle wiring at a position symmetrical to the straddle wiring  62  with respect to the Y axis in plan view. In the embodiment, the second movable part  4  may be provided with an electromotive force-monitoring coil for measuring an electromotive force and the support part  2  may be provided with a temperature sensor coil for measuring a temperature. 
     The first movable part  3  is made to swing around each of the X axis and the Y axis in the embodiment, but the actuator device  1  may be adapted so that the first movable part  3  swings around only the X axis. In this case, the second connecting part may not be a part that can be torsionally deformed like the second torsion bars  7  and  8 , and may be a part that connects the second movable part  4  to the support part  2  so that the first movable part  3  can swing around the X axis by the vibration of the second movable part  4  (so that at least the second movable part  4  can vibrate around the X axis). The degree of freedom in the design of this second connecting part is relatively high. For example, the second connecting part may be a pair of members that is arranged on both sides of the second movable part  4  on the Y axis and is connected to the second movable part  4  and the support part  2  on the Y axis, or may be a plurality of pairs of members that are connected to the second movable part  4  and the support part  2  at positions on the Y axis and/or at positions other than the positions on the Y axis. Alternatively, the second connecting part may be a pair of members that is arranged on both sides of the second movable part  4  on the X axis and is connected to the second movable part  4  and the support part  2  on the X axis. In these cases, the second movable part  4  is provided with one coil. The first movable part  3  can swing around the X axis by the input of a drive signal to the coil. 
     When the second movable part  4  is provided with only the coil  14 , the first wiring  21  may pass through the second torsion bar  7  and the second wiring  22  may pass through the second torsion bar  8 . However, both the first wiring  21  and the second wiring  22  may pass through the second torsion bar  7 . In this case, the dummy coil  67  can be omitted. At least one of the width W 4  of the straddle wiring  62  and the width W 7  of the straddle wiring  64  may be smaller than the width W 6  of the arrangement region R of the coils  14  and  15 . At least one of the length L 1  of the contact region between the coil  14  and the straddle wiring  62 , the length L 2  of the contact region between the lead wiring  61  and the straddle wiring  62 , the length L 3  of the contact region between the coil  15  and the straddle wiring  64 , and the length L 4  of the contact region between the lead wiring  63  and the straddle wiring  64  may be smaller than the width W 5  of each of the coils  14  and  15 . 
     The material and shape of each component are not limited to the above-mentioned material and shape, and various materials and shapes can be employed. For example, each of the straddle wirings  62  and  64  may include only a portion extending in one direction and the shapes and arrangement of the straddle wirings  62  and  64  are not limited to the above-mentioned example. The second movable part  4  may have a substantially circular shape, a substantially elliptical shape, a substantially rectangular shape, a substantially rhombic shape, or the like in plan view. The ring shape portion  3   b  may not be provided and the first torsion bars  5  and  6  may be directly connected to the body portion  3   a.  The second torsion bars  7  and  8  may extend linearly in plan view. The second torsion bars  7  and  8  may connect the second movable part  4  to the support part  2  at positions other than the positions on the Y axis so that the second movable part  4  can swing around the Y axis. At least one of the dummy straddle wirings  65  and  66  and the dummy coils  67  and  68  may not be provided. The actuator device  1  may be a device to drive a portion other than the mirror surface  10 . The pair of coils  14  and  15  is alternately arranged side by side in the embodiment, but one of the coils  14  and  15  may be arranged inside the other thereof in plan view. Three or more wires  29  may be connected to the first external terminal  25 . In the modification, the straddle wiring  62  may be provided so as to straddle the upper side of the coils  14  and  15  provided in the second movable part. In the embodiment, the first movable part  3  is made to swing by the vibration of the second movable part  4 . However, the first movable part  3  may be provided with a coil and may be made to directly swing by Lorentz force acting on the coil. Even in this case, an increase in the heating amount can be suppressed as in the embodiment. 
     REFERENCE SIGNS LIST 
       1 : actuator device,  2 : support part,  3 : first movable part,  4 : second movable part,  5 ,  6 : first torsion bar (first connecting part),  7 ,  8 : second torsion bar (second connecting part),  9 : magnetic field generator,  14 ,  15 : coil,  21 : first wiring,  21   a : wiring portion,  22 : second wiring,  25 : first external terminal,  26 : second external terminal,  29 : wire,  61 ,  63 : lead wiring,  62 ,  64 : straddle wiring,  65 ,  66 : dummy straddle wiring,  67 ,  68 : dummy coil.