Patent Description:
As the MEMS device, an optical device including a base, a movable unit including an optical function unit, and a pair of elastic support units that are connected between the base and the movable unit and supports the movable unit so that the movable unit is movable along a movement direction is known (for example, refer to <CIT>). In the optical device, each of the pair of elastic support units may include a pair of torsion support portions connected to the movable unit.

<CIT> discloses a micro-electro-mechanical system (MEMS) actuator assembly that includes a mirror and four actuators. Each actuator includes a lever pivotable about a fulcrum axis. The inner end of each lever is coupled to one side of the mirror. Force is applied to one outer end of the levers to move one side of the mirror, which positions the mirror in one of four positions. Force is applied to two outer ends of the levers to move two sides of the mirror, which positions the mirror in one of four additional positions. <CIT> discloses a light deflector that includes a fixing portion, a movable portion and a reinforcing member. The movable portion includes a mirror portion for deflecting light by swinging about a predetermined swing axis, a torsion bar fixedly supported on the fixing portion and having an axis serving as the swing axis, and a supporting body configured to support the mirror portion and fixed to the torsion bar. The supporting body includes a contact surface to be held in contact with the mirror portion and a non-contact surface opposite to the contact surface. The reinforcing member is provided only on the non-contact surface out of the contact surface and the non-contact surface of the supporting body and reinforces the supporting body and adjusts a center of gravity of the movable portion so that the center of gravity of the movable portion is located on the axis.

In the above-described optical device, because a plurality of torsion support portions are connected to the movable unit, distortion is likely to occur in the movable unit due to a sectional force form the torsion support portions during movement of the movable unit along a movement direction. There is a concern that the distortion of the movable unit may deteriorate optical characteristics, and thus suppression of the distortion is required. In addition, in the above-described optical device, securement of reliability is required.

An object of an aspect of the present disclosure is to provide an optical device capable of securing reliability while suppressing distortion of a movable unit.

According to an aspect of the present invention, there is provided an optical device as defined in the appended independent claim <NUM>. The dependent claims are directed to optional features and preferred embodiments.

In the optical device, the movable unit includes the main body portion, the frame portion that surrounds the main body portion with a predetermined interval from the main body portion when viewed from the predetermined direction, and the plurality of connection portions which connect the main body portion and the frame portion to each other. Accordingly, a sectional force from the pair of first torsion support portions and the pair of second torsion support portions is less likely to be transmitted to the main body portion, and thus it is possible to suppress distortion of the main body portion. In addition, because the first rib portion is formed, the thickness of the outer edge portion in the predetermined direction is larger than the thickness of the central portion in the predetermined direction. Accordingly, it is possible to more reliably suppress distortion of the main body portion. In addition, because the second rib portion is formed, the thickness of the frame portion in the predetermined direction is larger than the thickness of the central portion in the predetermined direction. Accordingly, it is possible to suppress distortion of the frame portion, and it is possible to suppress distortion of the main body portion which is caused by the distortion of the frame portion. In addition, in the optical device, the width of each of the plurality of connection portions is smaller than the distance from the connection position with each of the plurality of connection portions in the frame portion to any of the connection position with each of the pair of first torsion support portions and the connection position with each of the pair of second torsion support portions. Accordingly, it is possible to secure a distance from the connection position with each of the plurality of connection portions in the frame portion to the connection position with each of the pair of first torsion support portions and the connection position with each of the pair of second torsion support portions. As a result, the sectional force from the pair of first torsion support portions and the pair of second torsion support portions is further less likely to be transmitted to the main body portion, and thus it is possible to more reliably suppress distortion of the main body portion. In addition, in the optical device, the width of each of the plurality of connection portions is larger than the interval between the main body portion and the frame portion. Accordingly, it is possible to secure the strength of the connection portions, and thus even in a case where distortion of the main body portion is suppressed by connecting the main body portion and the frame portion with the connection portions, it is possible to secure the reliability. As described above, according to the optical device, it is possible to secure the reliability while suppressing distortion of the movable unit.

In the optical device according to the aspect of the present disclosure, in the frame portion, the connection position with each of the plurality of connection portions may be located between the connection position with each of the pair of first torsion support portions and the connection position with each of the pair of second torsion support portions. According to this configuration, it is also possible to secure the reliability while suppressing distortion of the movable unit.

In the optical device according to the aspect of the present disclosure, in the frame portion, the connection position with each of the plurality of connection portions may be located between the connection positions with the pair of first torsion support portions, or between the connection positions with the pair of second torsion support portions. According to this configuration, it is also possible to secure the reliability while suppressing distortion of the movable unit.

In the optical device according to the aspect of the present disclosure, the plurality of connection portions may be disposed in a point symmetry with respect to the center of the main body portion when viewed from the predetermined direction. In this case, it is possible to improve balance of the movable unit, and it is possible to more reliably suppress distortion of the main body portion.

In the optical device according to the aspect of the present disclosure, the width of each of the plurality of connection portions may be less than <NUM>/<NUM> times the distance from the connection position with each of the plurality of connection portions in the frame portion to any of the connection position with each of the pair of first torsion support portions and the connection position with each of the pair of second torsion support portions. In this case, the sectional force from the pair of first torsion support portions and the pair of second torsion support portions is further less likely to be transmitted to the main body portion, and thus it is possible to more reliably suppress distortion of the main body portion.

In the optical device according to the aspect of the present disclosure, the width of each of the plurality of connection portions may be smaller than a distance from an inner edge of the first rib portion to an outer edge of the frame portion when viewed from the predetermined direction. In this case, the sectional force from the pair of first torsion support portions and the pair of second torsion support portions is further less likely to be transmitted to the main body portion, and thus it is possible to more reliably suppress distortion of the main body portion.

In the optical device according to the aspect of the present disclosure, the main body portion and the optical function unit may have a circular shape when viewed from the predetermined direction, and each of the plurality of connection portions may be provided not to intersect a straight line that is perpendicular to a straight line that passes through the center of the connection portion and the center of the main body portion and is in contact with an outer edge of the optical function unit when viewed from the predetermined direction. In this case, the sectional force from the pair of first torsion support portions and the pair of second torsion support portions is further less likely to be transmitted to the main body portion, and thus it is possible to more reliably suppress distortion of the main body portion.

In the optical device according to the aspect of the present disclosure, each of the plurality of connection portions may include a third rib portion that is formed so that the thickness of each of the plurality of connection portions in the predetermined direction is larger than the thickness of the central portion in the predetermined direction, and the third rib portion may be connected to the first rib portion and the second rib portion. In this case, it is possible to suppress distortion of the connection portion, and it is possible to suppress distortion of the main body portion which is caused by the distortion of the connection portion.

In the optical device according to the aspect of the present disclosure, each of the pair of first torsion support portions and each of the pair of second torsion support portions may extend along a second direction that is perpendicular to the predetermined direction, and when viewed from the predetermined direction, any of an angle made by a straight line that passes through a connection position between the frame portion and one of the pair of first torsion support portions and the center of the main body portion, and an axial line that is perpendicular to the second direction and passes through the center of the main body portion, an angle made by a straight line that passes through a connection position between the frame portion and the other of the pair of first torsion support portions and the center of the main body portion, and the axial line, an angle made by a straight line that passes through a connection position between the frame portion and one of the pair of second torsion support portions and the center of the main body portion, and the axial line, and an angle made by a straight line that passes through a connection position between the frame portion and the other of the pair of second torsion support portions and the center of the main body portion, and the axial line may be <NUM>° or less. In this case, it is possible to secure the distance from the connection position with each of the plurality of connection portions in the frame portion to the connection position with each of the pair of first torsion support portions and the connection position with each of the pair of second torsion support portions to be large. As a result, the sectional force from the pair of first torsion support portions and the pair of second torsion support portions is further less likely to be transmitted to the main body portion, and thus it is possible to more reliably suppress distortion of the main body portion.

In the optical device according to the aspect of the present disclosure, each of the pair of first torsion support portions and each of the pair of second torsion support portions may extend along a second direction that is perpendicular to the predetermined direction, and when viewed from the predetermined direction, any of an angle made by a straight line that passes through a connection position between the frame portion and one of the pair of first torsion support portions and the center of the main body portion, and an axial line that is perpendicular to the second direction and passes through the center of the main body portion, an angle made by a straight line that passes through a connection position between the frame portion and the other of the pair of first torsion support portions and the center of the main body portion, and the axial line, an angle made by a straight line that passes through a connection position between the frame portion and one of the pair of second torsion support portions and the center of the main body portion, and the axial line, and an angle made by a straight line that passes through a connection position between the frame portion and the other of the pair of second torsion support portions and the center of the main body portion, and the axial line may be <NUM>° to <NUM>°. In this case, it is possible to secure the distance from the connection position with the base in the first elastic support unit and the second elastic support unit to the connection position with the movable unit while securing the distance from the connection position with each of the plurality of connection portions in the frame portion to the connection position with each of the pair of first torsion support portions and the connection position with each of the pair of second torsion support portions. As a result, it is possible to realize an increase in movement amount of the movable unit in the predetermined direction while suppressing distortion of the main body portion.

In the optical device according to the aspect of the present disclosure, the first elastic support unit may further include a pair of first levers which are respectively connected to the pair of first torsion support portions, and a pair of third torsion support portions which are respectively connected between the pair of first levers and the base, and the second elastic support unit may further include a pair of second levers which are respectively connected to the pair of second torsion support portions, and a pair of fourth torsion support portions which are respectively connected between the pair of second levers and the base. According to this configuration, it is also possible to secure the reliability while suppressing distortion of the movable unit.

According to the aspect of the present disclosure, it is possible to provide an optical device capable of securing reliability while suppressing distortion of a movable unit.

Hereinafter, an embodiment according to an aspect of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same reference numeral will be given to the same or equivalent parts in the respective drawings, and redundant description thereof will be omitted.

As illustrated in <FIG>, an optical module <NUM> includes a mirror unit <NUM> and a beam splitter unit <NUM>. The mirror unit <NUM> includes an optical device <NUM> and a fixed mirror <NUM>. The optical device <NUM> includes a movable mirror (movable unit) <NUM>. In the optical module <NUM>, an interference optical system is constituted by the beam splitter unit <NUM>, the movable mirror <NUM>, and the fixed mirror <NUM> with respect to measurement light L0. Here, the interference optical system is a Michelson interference optical system.

The optical device <NUM> includes a base <NUM>, a drive unit <NUM>, a first optical function unit <NUM>, and a second optical function unit <NUM> in addition to the movable mirror <NUM>. The base <NUM> includes a main surface 12a. The movable mirror <NUM> includes a mirror surface (optical function unit) 11a along a plane parallel to the main surface 12a. The movable mirror <NUM> is supported in the base <NUM> to be movable along a Z-axis direction (a direction parallel to a Z-axis, a predetermined direction) perpendicular to the main surface 12a. The drive unit <NUM> moves the movable mirror <NUM> along the Z-axis direction. The first optical function unit <NUM> is disposed on one side of the movable mirror <NUM> in an X-axis direction (a direction parallel to an X-axis, a third direction) perpendicular to the Z-axis direction when viewed from the Z-axis direction. The second optical function unit <NUM> is disposed on the other side of the movable mirror <NUM> in the X-axis direction when viewed from the Z-axis direction. The first optical function unit <NUM> and the second optical function unit <NUM> are light passage openings provided in the base <NUM>, and are respectively opened to one side and the other side in the Z-axis direction. In the optical module <NUM>, the second optical function unit <NUM> is not used as the light passage opening. In a case where the optical device <NUM> is applied to another device, at least one of the first optical function unit <NUM> and the second optical function unit <NUM> may be used as an optical function unit, or both the first optical function unit <NUM> and the second optical function unit <NUM> may not be used as the optical function unit.

The fixed mirror <NUM> includes a mirror surface 21a that extends along a plane (plane perpendicular to the Z-axis direction) parallel to the main surface 12a. A position of the fixed mirror <NUM> with respect to the base <NUM> is fixed. In the mirror unit <NUM>, the mirror surface 11a of the movable mirror <NUM> and the mirror surface 21a of the fixed mirror <NUM> face one side (the beam splitter unit <NUM> side) in the Z-axis direction.

The mirror unit <NUM> includes a support <NUM>, a sub-mount <NUM>, and a package <NUM> in addition to the optical device <NUM> and the fixed mirror <NUM>. The package <NUM> accommodates the optical device <NUM>, the fixed mirror <NUM>, the support <NUM>, and the sub-mount <NUM>. The package <NUM> includes a bottom wall <NUM>, a side wall <NUM>, and a ceiling wall <NUM>. For example, the package <NUM> is formed in a rectangular parallelepiped box shape. For example, the package <NUM> has a size of approximately <NUM> × <NUM> × <NUM> (thickness) mm. The bottom wall <NUM> and the side wall <NUM> are integrally formed. The ceiling wall <NUM> faces the bottom wall <NUM> in the Z-axis direction, and is fixed to the side wall <NUM>. The ceiling wall <NUM> has optical transparency with respect to the measurement light L0. In the mirror unit <NUM>, a space S is formed by the package <NUM>. For example, the space S is opened to the outside of the mirror unit <NUM> through a ventilation hole or a gap that is formed in the package <NUM>. In a case where the space S is not an air-tight space as described above, it is possible to suppress contamination, hazing, or the like of the mirror surface 11a which is caused by an out-gas from a resin material that exists in the package <NUM>, a moisture that exists in the package <NUM>, or the like. The space S may be an air-tight space in which the degree of vacuum is maintained to be high, or an air-tight space filled with an inert gas such as nitrogen.

A support <NUM> is fixed to an inner surface of the bottom wall <NUM> through the sub-mount <NUM>. For example, the support <NUM> is formed in a rectangular plate shape. The support <NUM> has optical transparency with respect to the measurement light L0. The base <NUM> of the optical device <NUM> is fixed to a surface 22a of the support <NUM> on a side opposite to the sub-mount <NUM>. That is, the base <NUM> is supported by the support <NUM>. A concave portion 22b is formed in the surface 22a of the support <NUM>, and a gap (a part of the space S) is formed between the optical device <NUM> and the ceiling wall <NUM>. Accordingly, when the movable mirror <NUM> is caused to move along the Z-axis direction, the movable mirror <NUM> and the drive unit <NUM> are prevented from coming into contact with the support <NUM> and the ceiling wall <NUM>.

An opening 23a is formed in the sub-mount <NUM>. The fixed mirror <NUM> is disposed on a surface 22c of the support <NUM> on the sub-mount <NUM> side to be located in the opening 23a. That is, the fixed mirror <NUM> is disposed on the surface 22c of the support <NUM> on a side opposite to the base <NUM>. The fixed mirror <NUM> is disposed on one side of the movable mirror <NUM> in the X-axis direction when viewed from the Z-axis direction. The fixed mirror <NUM> overlaps the first optical function unit <NUM> of the optical device <NUM> when viewed from the Z-axis direction.

The mirror unit <NUM> further includes a plurality of lead pins <NUM> and a plurality of wires <NUM>. The lead pins <NUM> are fixed to the bottom wall <NUM> in a state of penetrating the bottom wall <NUM>. The lead pins <NUM> are electrically connected to the drive unit <NUM> through the wires <NUM>. In the mirror unit <NUM>, an electric signal for moving the movable mirror <NUM> along the Z-axis direction is applied to the drive unit <NUM> through the plurality of lead pins <NUM> and the plurality of wires <NUM>.

The beam splitter unit <NUM> is supported by the ceiling wall <NUM> of the package <NUM>. Specifically, the beam splitter unit <NUM> is fixed to a surface 243a of the ceiling wall <NUM> on a side opposite to the optical device <NUM> by an optical resin <NUM>. The optical resin <NUM> has optical transparency with respect to the measurement light L0.

The beam splitter unit <NUM> includes, a half mirror surface <NUM>, a total reflection mirror surface <NUM> and a plurality of optical surfaces 33a, 33b, 33c, and 33d. The beam splitter unit <NUM> is constituted by joining a plurality of optical blocks. For example, the half mirror surface <NUM> is formed by a dielectric multi-layer film. For example, the total reflection mirror surface <NUM> is formed by a metal film.

For example, the optical surface 33a is a surface that is perpendicular to the Z-axis direction, and overlaps the first optical function unit <NUM> of the optical device <NUM> and the mirror surface 21a of the fixed mirror <NUM> when viewed from the Z-axis direction. The optical surface 33a allows the measurement light L0 incident along the Z-axis direction to be transmitted therethrough.

For example, the half mirror surface <NUM> is a surface that is inclined at an angle of <NUM>° with respect to the optical surface 33a, and overlaps the first optical function unit <NUM> of the optical device <NUM> and the mirror surface 21a of the fixed mirror <NUM> when viewed from the Z-axis direction. The half mirror surface <NUM> reflects a part of the measurement light L0, which is incident to the optical surface 33a along the Z-axis direction, along the X-axis direction, and allows the remainder of the measurement light L0 to be transmitted therethrough toward the fixed mirror <NUM> side along the Z-axis direction.

The total reflection mirror surface <NUM> is a surface that is parallel to the half mirror surface <NUM>, overlaps the mirror surface 11a of the movable mirror <NUM> when viewed from the Z-axis direction, and overlaps the half mirror surface <NUM> when viewed from the X-axis direction. The total reflection mirror surface <NUM> reflects the part of the measurement light L0 which is reflected by the half mirror surface <NUM> toward the movable mirror <NUM> side along the Z-axis direction.

The optical surface 33b is a surface that is parallel to the optical surface 33a, and overlaps the mirror surface 11a of the movable mirror <NUM> when viewed from the Z-axis direction. The optical surface 33b allows the part of the measurement light L0 which is reflected by the total reflection mirror surface <NUM> to be transmitted therethrough toward the movable mirror <NUM> side along the Z-axis direction.

The optical surface 33c is a surface that is parallel to the optical surface 33a, and overlaps the mirror surface 21a of the fixed mirror <NUM> when viewed from the Z-axis direction. The optical surface 33c allows the remainder of the measurement light L0 which is transmitted through the half mirror surface <NUM> to be transmitted therethrough toward the fixed mirror <NUM> side along the Z-axis direction.

For example, the optical surface 33d is a surface that is perpendicular to the X-axis direction, and overlaps the half mirror surface <NUM> and the total reflection mirror surface <NUM> when viewed from the X-axis direction. The optical surface 33d allows measurement light L1 to be transmitted therethrough along the X-axis direction. The measurement light L1 is interference light of the part of the measurement light L0 which is sequentially reflected by the mirror surface 11a of the movable mirror <NUM> and the total reflection mirror surface <NUM> and is transmitted through the half mirror surface <NUM>, and the remainder of the measurement light L0 which is sequentially reflected by the mirror surface 21a of the fixed mirror <NUM> and the half mirror surface <NUM>.

In the optical module <NUM> constituted as described above, when the measurement light L0 is incident to the beam splitter unit <NUM> from the outside of the optical module <NUM> through the optical surface 33a, a part of the measurement light L0 is sequentially reflected by the half mirror surface <NUM> and the total reflection mirror surface <NUM>, and proceeds through the mirror surface 11a of the movable mirror <NUM>. In addition, the part of the measurement light L0 is reflected by the mirror surface 11a of the movable mirror <NUM>, proceeds on the same optical path (an optical path P1 to be described later) in an opposite direction, and is transmitted through the half mirror surface <NUM> of the beam splitter unit <NUM>.

On the other hand, the remainder of the measurement light L0 is transmitted through the half mirror surface <NUM> of the beam splitter unit <NUM>, passes through the first optical function unit <NUM>, is transmitted through the support <NUM>, and proceeds toward the mirror surface 21a of the fixed mirror <NUM>. In addition, the remainder of the measurement light L0 is reflected by the mirror surface 21a of the fixed mirror <NUM>, proceeds on the same optical path (an optical path P2 to be described later) in an opposite direction, and is reflected by the half mirror surface <NUM> of the beam splitter unit <NUM>.

The part of the measurement light L0 which is transmitted through the half mirror surface <NUM> of the beam splitter unit <NUM>, and the remainder of the measurement light L0 which is reflected by the half mirror surface <NUM> of the beam splitter unit <NUM> become the measurement light L1 that is interference light, and the measurement light L1 is emitted from the beam splitter unit <NUM> to the outside of the optical module <NUM> through the optical surface 33d. According to the optical module <NUM>, it is possible to reciprocate the movable mirror <NUM> at a high speed along the Z-axis direction, and thus it is possible to provide a small-sized high-accuracy Fourier transformation type infrared spectral analyzer (FTIR).

The support <NUM> corrects an optical path difference between the optical path P1 between the beam splitter unit <NUM> and the movable mirror <NUM>, and the optical path P2 between the beam splitter unit <NUM> and the fixed mirror <NUM>. Specifically, the optical path P1 is an optical path ranging from the half mirror surface <NUM> to the mirror surface 11a of the movable mirror <NUM> which is located at a reference position with the total reflection mirror surface <NUM> and the optical surface 33b sequentially interposed therebetween, and is an optical path along which the part of the measurement light L0 proceeds. The optical path P2 is an optical path ranging from the half mirror surface <NUM> to the mirror surface 21a of the fixed mirror <NUM> with the optical surface 33c and the first optical function unit <NUM> sequentially interposed therebetween, and is an optical path through which the remainder of the measurement light L0 proceeds. The support <NUM> corrects the optical path difference between the optical path P1 and the optical path P2 so that a difference between an optical path length of the optical path P1 (an optical path length in consideration of a refractive index of each medium through which the optical path P1 passes), and an optical path length of the optical path P2 (an optical path length in consideration of a refractive index of each medium through which the optical path P2 passes) decreases (for example, disappears). For example, the support <NUM> can be formed by the same light-transmitting material as in the optical blocks which constitute the beam splitter unit <NUM>. In this case, the thickness of the support <NUM> (a length in the Z-axis direction) can be set to be the same as a distance between the half mirror surface <NUM> and the total reflection mirror surface <NUM> in the X-axis direction.

As illustrated in <FIG>, <FIG>, and <FIG>, a portion of the movable mirror <NUM> excluding the mirror surface 11a, the base <NUM>, the drive unit <NUM>, the first optical function unit <NUM>, and the second optical function unit <NUM> are constituted by a silicon on insulator (SOI) substrate <NUM>. That is, the optical device <NUM> is constituted by the SOI substrate <NUM>. For example, the optical device <NUM> is formed in a rectangular plate shape. For example, the optical device <NUM> has a size of approximately <NUM> × <NUM> × <NUM> (thickness) mm. The SOI substrate <NUM> includes a support layer <NUM>, a device layer <NUM>, and an intermediate layer <NUM>. The support layer <NUM> is a first silicon layer. The device layer <NUM> is a second silicon layer. The intermediate layer <NUM> is an insulating layer that is disposed between the support layer <NUM> and the device layer <NUM>.

The base <NUM> is formed at a part of the support layer <NUM>, the device layer <NUM>, and the intermediate layer <NUM>. The main surface 12a of the base <NUM> is a surface of the device layer <NUM> on a side opposite to the intermediate layer <NUM>. A main surface 12b of the base <NUM> on a side opposite to the main surface 12a is a surface of the support layer <NUM> on a side opposite to the intermediate layer <NUM>. In the optical module <NUM>, the main surface 12a of the base <NUM> and the surface 22a of the support <NUM> are joined to each other (refer to <FIG>).

The movable mirror <NUM> is disposed in a state in which an intersection between an axial line R1 and an axial line R2 is set as the central position (gravity center position). An intersection of the axial line R1 and the axial line R2 matches a center C1 of the main body portion <NUM> to be described later. The axial line R1 is a straight line that extends in the X-axis direction. The axial line R2 is a straight line that extends in a Y-axis direction (a direction parallel to a Y-axis, a second direction) that is perpendicular to the X-axis direction and the Z-axis direction. The optical device <NUM> has a shape that is linearly symmetric to each of the axial line R1 and the axial line R2 when viewed from the Z-axis direction.

The movable mirror <NUM> includes a main body portion <NUM>, a frame portion <NUM>, and a pair of connection portions <NUM>. The main body portion <NUM> has a circular shape when viewed from the Z-axis direction. The main body portion <NUM> includes a central portion <NUM> and an outer edge portion <NUM>. For example, the mirror surface 11a having a circular shape is provided on a surface of the central portion <NUM> on the main surface 12b side by forming a metal film thereon. The central portion <NUM> is formed by a part of the device layer <NUM>. The outer edge portion <NUM> surrounds the central portion <NUM> when viewed from the Z-axis direction. The outer edge portion <NUM> includes a first main body portion 115a and a first rib portion 115b. The first main body portion 115a is formed by a part of the device layer <NUM>.

The first rib portion 115b is formed at a part of the support layer <NUM> and the intermediate layer <NUM>. The first rib portion 115b is provided on a surface of the first main body portion 115a on the main surface 12b side. The first rib portion 115b is formed so that the thickness of the outer edge portion <NUM> in the Z-axis direction is larger than the thickness of the central portion <NUM> in the Z-axis direction. The first rib portion 115b has a circular ring shape when viewed from the Z-axis direction, and surrounds the mirror surface 11a. The first rib portion 115b extends along an outer edge of the main body portion <NUM> when viewed from the Z-axis direction. In this embodiment, an outer edge of the first rib portion 115b extends along the outer edge of the main body portion <NUM> with a predetermined interval from the outer edge of the main body portion <NUM> when viewed from the Z-axis direction. An inner edge of the first rib portion 115b extends along an outer edge of the mirror surface 11a with a predetermined interval from the outer edge of the mirror surface 11a when viewed from the Z-axis direction.

The frame portion <NUM> surrounds the main body portion <NUM> with a predetermined interval G (refer to <FIG>) from the main body portion <NUM> when viewed from the Z-axis direction. The frame portion <NUM> has a circular ring shape when viewed from the Z-axis direction. A pair of slits SL having a circular arc-shaped cross-section is formed between the frame portion <NUM> and the main body portion <NUM> when viewed from the Z-axis direction. A width of the slit SL is the same as the interval G. The frame portion <NUM> extends in a ring shape to surround the main body portion <NUM> when viewed from the Z-axis direction. For example, in this embodiment, when viewed from the Z-axis direction, an inner edge of the frame portion <NUM> extends along an outer edge of the main body portion <NUM> and an outer edge of the frame portion <NUM> extends along the inner edge of the frame portion <NUM>. The frame portion <NUM> includes a second main body portion 112a and a second rib portion 112b. The second main body portion 112a is formed by a part of the device layer <NUM>.

The second rib portion 112b is formed by a part of the support layer <NUM> and the intermediate layer <NUM>. The second rib portion 112b is provided on a surface of the second main body portion 112a on the main surface 12b side. The second rib portion 112b is formed so that the thickness of the frame portion <NUM> in the Z-axis direction is larger than the thickness of the central portion <NUM> in the Z-axis direction. The second rib portion 112b has a circular ring shape when viewed from the Z-axis direction. An outer edge of the second rib portion 112b extends along an outer edge of the frame portion <NUM> with a predetermined interval from the outer edge of the frame portion <NUM> when viewed from the Z-axis direction. An inner edge of the second rib portion 112b extends along an inner edge of the frame portion <NUM> with a predetermined interval from the inner edge of the frame portion <NUM> when viewed from the Z-axis direction.

The thickness of the second rib portion 112b in the Z-axis direction is the same as the thickness of the first rib portion 115b in the Z-axis direction. A width of the second rib portion 112b is wider than a width of the first rib portion 115b when viewed from the Z-axis direction. The width of the first rib portion 115b when viewed from the Z-axis direction is a length of the first rib portion 115b in a direction that is perpendicular to an extending direction of the first rib portion 115b, and is a length of the first rib portion 115b in a radial direction of the first rib portion 115b in this embodiment. This is also true of a width of the second rib portion 112b when viewed from the Z-axis direction.

The pair of connection portions <NUM> connect the main body portion <NUM> and the frame portion <NUM>. The pair of connection portions <NUM> are disposed in a point symmetry with respect to the center C1 of the main body portion <NUM> when viewed from the Z-axis direction. The pair of connection portions <NUM> are respectively disposed on one side and on the other side in the Y-axis direction with respect to the main body portion <NUM>. Each of the connection portions <NUM> includes a third main body portion 113a and a third rib portion 113b. The third main body portion 113a is formed by a part of the device layer <NUM>. The third main body portion 113a is connected to the first main body portion 115a and the second main body portion 112a.

The third rib portion 113b is formed by a part of the support layer <NUM> and the intermediate layer <NUM>. The third rib portion 113b is connected to the first rib portion 115b and the second rib portion 112b. The third rib portion 113b is provided on a surface of the third main body portion 113a on the main surface 12b side. The third rib portion 113b is formed so that the thickness of the connection portion <NUM> in the Z-axis direction is larger than the thickness of the central portion <NUM> in the Z-axis direction. The thickness of the third rib portion 113b in the Z-axis direction is the same as the thickness of each of the first rib portion 115b and the second rib portion 112b in the Z-axis direction. A width of the third rib portion 113b is larger than a width of each of the first rib portion 115b and the second rib portion 112b. The width of the third rib portion 113b is a length of the third rib portion 113b along an extending direction of the first rib portion 115b.

The movable mirror <NUM> further includes a pair of brackets <NUM> and a pair of brackets <NUM>. The brackets <NUM> and the brackets <NUM> are formed by a part of the device layer <NUM>. The brackets <NUM> extend along the Y-axis direction and have a rectangular shape when viewed from the Z-axis direction. One of the brackets <NUM> protrudes from a lateral surface of the frame portion <NUM> toward one side in the Y-axis direction, and the other bracket <NUM> protrudes from the lateral surface of the frame portion <NUM> toward the other side in the Y-axis direction. The pair of brackets <NUM> are disposed on the same central line parallel to the Y-axis direction. The brackets <NUM> extend from an end of the frame portion <NUM> on the first optical function unit <NUM> side.

The brackets <NUM> extend along the Y-axis direction, and have a rectangular shape when viewed from the Z-axis direction. One of the brackets <NUM> protrudes from the lateral surface of the frame portion <NUM> toward the one side in the Y-axis direction, and the other bracket <NUM> protrudes from the lateral surface of the frame portion <NUM> toward the other side in the Y-axis direction. The pair of brackets <NUM> are disposed on the same central line parallel to the Y-axis direction. The brackets <NUM> extend from an end of the frame portion <NUM> on the second optical function unit <NUM> side (a side opposite to the first optical function unit <NUM>).

The drive unit <NUM> includes a first elastic support unit <NUM>, a second elastic support unit <NUM>, and an actuator unit <NUM>. The first elastic support unit <NUM>, the second elastic support unit <NUM>, and the actuator unit <NUM> are formed by the device layer <NUM>.

Each of the first elastic support unit <NUM> and the second elastic support unit <NUM> is connected between the base <NUM> and the movable mirror <NUM>. The first elastic support unit <NUM> and the second elastic support unit <NUM> support the movable mirror <NUM> so that the movable mirror <NUM> is movable along the Z-axis direction.

The first elastic support unit <NUM> includes a pair of levers (first levers) <NUM>, a link <NUM>, a link <NUM>, a pair of brackets <NUM>, a pair of first torsion bars (first torsion support portions) <NUM>, a pair of third torsion bars (third torsion support portions) <NUM>, and a pair of electrode support portions <NUM>. The pair of levers <NUM> are respectively disposed on both sides of the first optical function unit <NUM> in the Y-axis direction. The levers <NUM> have a plate shape that extends along a plane perpendicular to the Z-axis direction. In this embodiment, the levers <NUM> extend along the X-axis direction.

The link <NUM> bridges ends 141a of the pair of levers <NUM> on the movable mirror <NUM> side. The link <NUM> has a plate shape that extends along a plane perpendicular to the Z-axis direction. The link <NUM> extends along the Y-axis direction. The link <NUM> bridges ends 141b of the pair of levers <NUM> on a side opposite to the movable mirror <NUM>. The link <NUM> has a plate shape that extends along a plane perpendicular to the Z-axis direction, and extends along the Y-axis direction. In this embodiment, the first optical function unit <NUM> is an opening that is defined by the pair of levers <NUM>, the link <NUM>, and the link <NUM>. The first optical function unit <NUM> has a rectangular shape when viewed from the Z-axis direction. For example, the first optical function unit <NUM> is a cavity. Alternatively, a material having optical transparency with respect to the measurement light L0 may be disposed in the opening that constitutes the first optical function unit <NUM>.

The brackets <NUM> have a rectangular shape when viewed from the Z-axis direction. The brackets <NUM> are formed on a surface of the link <NUM> on the movable mirror <NUM> side to protrude toward the movable mirror <NUM> side. One of the brackets <NUM> is disposed in the vicinity of one end of the link <NUM>, and the other bracket <NUM> is disposed in the vicinity of the other end of the link <NUM>.

The pair of first torsion bars <NUM> respectively bridge a tip end of one of the brackets <NUM> and one of the brackets <NUM>, and a tip end of the other bracket <NUM> and the other bracket <NUM>. That is, the pair of first torsion bars <NUM> are respectively connected between the pair of levers <NUM> and the movable mirror <NUM>. The first torsion bars <NUM> extend along the Y-axis direction. The pair of first torsion bars <NUM> are disposed on the same central line parallel to the Y-axis direction.

The pair of third torsion bars <NUM> respectively bridge an end 141b of one of the levers <NUM> on a side opposite to the movable mirror <NUM> and the base <NUM>, and an end 141b of the other lever <NUM> on a side opposite to the movable mirror <NUM> and the base <NUM>. That is, the pair of third torsion bars <NUM> are respectively connected between the pair of levers <NUM> and the base <NUM>. The third torsion bars <NUM> extend along the Y-axis direction. The pair of third torsion bars <NUM> are disposed on the same central line parallel to the Y-axis direction. The end 141b of each of the levers <NUM> is provided with a protrusion 141c that protrudes toward an outer side in the Y-axis direction, and each of the third torsion bars <NUM> is connected to the protrusion 141c.

The electrode support portions <NUM> extend along the Y-axis direction, and have a rectangular shape when viewed from the Z-axis direction. One of the electrode support portions <NUM> extends from an intermediate portion of one of the levers <NUM> toward a side opposite to the first optical function unit <NUM>. The other electrode support portion <NUM> protrudes from an intermediate portion of the other lever <NUM> toward a side opposite to the first optical function unit <NUM>. The pair of electrode support portions <NUM> are disposed on the same central line parallel to the Y-axis direction when viewed from the Z-axis direction.

The second elastic support unit <NUM> includes a pair of levers (second levers) <NUM>, a link <NUM>, a link <NUM>, a pair of brackets <NUM>, a pair of second torsion bars (second torsion support portions) <NUM>, a pair of fourth torsion bars (fourth torsion support portions) <NUM>, and a pair of electrode support portions <NUM>. The pair of levers <NUM> are respectively disposed on both sides of the second optical function unit <NUM> in the Y-axis direction. The levers <NUM> have a plate shape that extends along a plane perpendicular to the Z-axis direction. In this embodiment, the levers <NUM> extend along the X-axis direction.

The link <NUM> bridges ends 151a of the pair of levers <NUM> on the movable mirror <NUM> side. The link <NUM> has a plate shape that extends along a plane perpendicular to the Z-axis direction. The link <NUM> extends along the Y-axis direction. The link <NUM> bridges ends 151b of the pair of levers <NUM> on a side opposite to the movable mirror <NUM>. The link <NUM> has a plate shape that extends along a plane perpendicular to the Z-axis direction, and extends along the Y-axis direction. In this embodiment, the second optical function unit <NUM> is an opening that is defined by the pair of levers <NUM>, the link <NUM>, and the link <NUM>. The second optical function unit <NUM> has a rectangular cross-sectional shape when viewed from the Z-axis direction. For example, the second optical function unit <NUM> is a cavity. Alternatively, a material having optical transparency with respect to the measurement light L0 may be disposed in the opening that constitutes the second optical function unit <NUM>.

The pair of second torsion bars <NUM> respectively bridge a tip end of one of the brackets <NUM> and one of the brackets <NUM>, and a tip end of the other bracket <NUM> and the other bracket <NUM>. That is, the pair of second torsion bars <NUM> are respectively connected between the pair of levers <NUM> and the movable mirror <NUM>. The second torsion bars <NUM> extend along the Y-axis direction. The pair of second torsion bars <NUM> are disposed on the same central line parallel to the Y-axis direction.

The pair of fourth torsion bars <NUM> respectively bridge an end 151b of one of the levers <NUM> on a side opposite to the movable mirror <NUM> and the base <NUM>, and an end 151b of the other lever <NUM> on a side opposite to the movable mirror <NUM> and the base <NUM>. That is, the pair of fourth torsion bars <NUM> are respectively connected between the pair of levers <NUM> and the base <NUM>. The fourth torsion bars <NUM> extend along the Y-axis direction. The pair of fourth torsion bars <NUM> are disposed on the same central line parallel to the Y-axis direction. The end 151b of each of the levers <NUM> is provided with a protrusion 151c that protrudes toward an outer side in the Y-axis direction, and each of the fourth torsion bars <NUM> is connected to the protrusion 151c.

The electrode support portions <NUM> extend along the Y-axis direction, and have a rectangular shape when viewed from the Z-axis direction. One of the electrode support portions <NUM> extends from an intermediate portion of one of the levers <NUM> toward a side opposite to the second optical function unit <NUM>. The other electrode support portion <NUM> protrudes from an intermediate portion of the other lever <NUM> toward a side opposite to the second optical function unit <NUM>. The pair of electrode support portions <NUM> are disposed on the same central line parallel to the Y-axis direction when viewed from the Z-axis direction.

The actuator unit <NUM> moves the movable mirror <NUM> along the Z-axis direction. The actuator unit <NUM> includes a pair of fixed comb electrodes <NUM>, a pair of movable comb electrodes <NUM>, a pair of fixed comb electrodes <NUM>, and a pair of movable comb electrodes <NUM>. Positions of the fixed comb electrodes <NUM> and <NUM> are fixed. The movable comb electrodes <NUM> and <NUM> move in accordance with movement of the movable mirror <NUM>.

One of the fixed comb electrodes <NUM> is provided on a surface the device layer <NUM> of the base <NUM> which faces one of the electrode support portions <NUM>. The other fixed comb electrode <NUM> is provided on a surface of the device layer <NUM> which faces the other electrode support portion <NUM>. Each of the fixed comb electrodes <NUM> includes a plurality of fixed comb fingers 161a which extend along a plane perpendicular to the Y-axis direction. The fixed comb fingers 161a are disposed to be aligned with a predetermined interval in the Y-axis direction.

One of the movable comb electrodes <NUM> is provided on both surfaces of one of the electrode support portions <NUM> in the X-axis direction. The other movable comb electrode <NUM> is provided on both surfaces of the other electrode support portion <NUM> in the X-axis direction. Each of the movable comb electrodes <NUM> includes a plurality of movable comb fingers 162a which extend along a plane perpendicular to the Y-axis direction. The movable comb fingers 162a are disposed to be aligned with a predetermined interval in the Y-axis direction.

In one of the fixed comb electrodes <NUM> and one of the movable comb electrodes <NUM>, the plurality of fixed comb fingers 161a and the plurality of movable comb fingers 162a are alternately disposed. That is, each of the fixed comb fingers 161a of one of the fixed comb electrodes <NUM> is located between the movable comb fingers 162a of one of the movable comb electrodes <NUM>. In the other fixed comb electrode <NUM> and the other movable comb electrode <NUM>, the plurality of fixed comb fingers 161a and the plurality of movable comb fingers 162a are alternately disposed. That is, each of the fixed comb fingers 161a of the other fixed comb electrode <NUM> is located between the movable comb fingers 162a of the other movable comb electrode <NUM>. In the pair of fixed comb electrodes <NUM> and the pair of movable comb electrodes <NUM>, the fixed comb fingers 161a and the movable comb fingers 162a which are adjacent to each other face each other in the Y-axis direction. For example, a distance between the fixed comb fingers 161a and the movable comb fingers 162a which are adjacent to each other is approximately several µm.

One of the fixed comb electrodes <NUM> is provided on a surface of the device layer <NUM> of the base <NUM> which faces one of the electrode support portions <NUM>. The other fixed comb electrode <NUM> is provided on a surface of the device layer <NUM> which faces the other electrode support portion <NUM>. Each of the fixed comb electrodes <NUM> includes a plurality of fixed comb fingers 163a which extend along a plane perpendicular to the Y-axis direction. The fixed comb fingers 163a are disposed to be aligned with a predetermined interval in the Y-axis direction.

One of the movable comb electrodes <NUM> is provided on both surfaces of one of the electrode support portions <NUM> in the X-axis direction. The other movable comb electrode <NUM> is provided on both surfaces of the other electrode support portion <NUM> in the X-axis direction. Each of the movable comb electrodes <NUM> includes a plurality of movable comb fingers 164a which extend along a plane perpendicular to the Y-axis direction. The movable comb fingers 164a are disposed to be aligned with a predetermined interval in the Y-axis direction.

In one of the fixed comb electrodes <NUM> and one of the movable comb electrodes <NUM>, the plurality of fixed comb fingers 163a and the plurality of movable comb fingers 164a are alternately disposed. That is, each of the fixed comb fingers 163a of one of the fixed comb electrodes <NUM> is located between the movable comb fingers 164a of one of the movable comb electrodes <NUM>. In the other fixed comb electrode <NUM> and the other movable comb electrode <NUM>, the plurality of fixed comb fingers 163a and the plurality of movable comb fingers 164a are alternately disposed. That is, each of the fixed comb fingers 163a of the other fixed comb electrode <NUM> is located between the movable comb fingers 164a of the other movable comb electrode <NUM>. In the pair of fixed comb electrodes <NUM> and the pair of movable comb electrodes <NUM>, the fixed comb fingers 163a and the movable comb fingers 164a which are adjacent to each other face each other in the Y-axis direction. For example, a distance between the fixed comb fingers 163a and the movable comb fingers 164a which are adjacent to each other is approximately several µm.

A plurality of electrode pads <NUM> and <NUM> are provided in the base <NUM>. The electrode pads <NUM> and <NUM> are formed on a surface of the device layer <NUM> in openings 12c formed in the main surface 12b of the base <NUM> to reach the device layer <NUM>. The electrode pads <NUM> are electrically connected to the fixed comb electrodes <NUM> or the fixed comb electrodes <NUM> through the device layer <NUM>. The electrode pads <NUM> are electrically connected to the movable comb electrodes <NUM> or the movable comb electrodes <NUM> through the first elastic support unit <NUM> or the second elastic support unit <NUM>. Each of the wires <NUM> bridges each of the electrode pads <NUM> and <NUM> and each of the lead pins <NUM>.

In the optical device <NUM> constituted as described above, when a voltage is applied to between the plurality of electrode pads <NUM> and the plurality of electrode pads <NUM> through the plurality of lead pins <NUM> and the plurality of wires <NUM>, an electrostatic force occurs between the fixed comb electrodes <NUM> and the movable comb electrodes <NUM> which face each other, and between the fixed comb electrodes <NUM> and the movable comb electrodes <NUM> which face each other to move the movable mirror <NUM>, for example, toward one side in the Z-axis direction. At this time, the first torsion bar <NUM>, the third torsion bar <NUM>, the second torsion bar <NUM>, and the fourth torsion bar <NUM> in the first elastic support unit <NUM> and the second elastic support unit <NUM> are twisted, and an elastic force occurs in the first elastic support unit <NUM> and the second elastic support unit <NUM>. In the optical device <NUM>, when a periodic electric signal is applied to the drive unit <NUM> through the plurality of lead pins <NUM> and the plurality of wires <NUM>, it is possible to reciprocate the movable mirror <NUM> along the Z-axis direction at a resonance frequency level. In this manner, the drive unit <NUM> functions as an electrostatic actuator.

The configuration of the movable mirror <NUM> will be described in more detail with reference to <FIG>. In <FIG>, the first rib portion 115b, the second rib portion 112b, and the third rib portion 113b are omitted. In the following description, a position at which the frame portion <NUM> and the connection portions <NUM> are connected to each other is set as a connection position A1, a position at which the frame portion <NUM> and the first torsion bars <NUM> are connected to each other is set as a connection position A2, and a position at which the frame portion <NUM> and the second torsion bars <NUM> are connected to each other is set as a connection position A3.

In a case where the frame portion <NUM> and the first torsion bar <NUM> are connected to each other through another element (in this embodiment, the bracket <NUM>) as in this embodiment, the connection position A2 is a position at which the frame portion <NUM> and the other element are connected to each other. In other words, the connection position A2 is a connection position between the first torsion support portion and the frame portion <NUM>. For example, in a case where the first torsion support portion includes an element other than the first torsion bar <NUM>, the connection position A2 may be a position at which the element other than the first torsion bar <NUM> and the frame portion <NUM> are connected to each other. For example, in a case where the first torsion support portion includes a meandering portion that extends in a meandering manner and is connected to the first torsion bar <NUM> and the frame portion <NUM> when viewed from the Z-axis direction, the connection position A2 is a position at which the meandering portion and the frame portion <NUM> are connected to each other. Similarly, in a case where the frame portion <NUM> and the first torsion bar <NUM> are connected to each other through another element (in this embodiment, the bracket <NUM>) as in this embodiment, the connection position A3 is a position at which the frame portion <NUM> and the other element are connected to each other. In other words, in a case where the connection position A3 is a connection position between the second torsion support portion and the frame portion <NUM>, and for example, the second torsion support portion includes an element other than the second torsion bar <NUM>, the connection position A3 may be a position at which the element other than the second torsion bar <NUM> and the frame portion <NUM> are connected to each other.

For example, the connection position A1 is a central portion of a connection portion between the frame portion <NUM> and the connection portion <NUM>. In this embodiment, the connection position A1 is a position of an intersection between an inner edge of the frame portion <NUM>, and a straight line (the axial line R2 in an example in <FIG>) that passes through the center C2 of the connection portion <NUM> and the center C1 of the main body portion <NUM>. For example, the connection position A2 is a central portion of a connection portion between the frame portion <NUM> and the first torsion bar <NUM> (first torsion support portion). In this embodiment, the connection position A2 is a position of an intersection between an outer edge of the frame portion <NUM> (a line segment that virtually extends from the outer edge) and a central line of the first torsion bar <NUM> and the bracket <NUM>. In a case where the frame portion <NUM> and the first torsion bar <NUM> are connected to each other through another element, for example, the connection position A2 is a central portion of a connection portion between the frame portion <NUM> and the other element. For example, the connection position A3 is a central portion of a connection portion between the frame portion <NUM> and the second torsion bar <NUM> (second torsion support portion). In this embodiment, the connection position A3 is a position of an intersection between an outer edge of the frame portion <NUM> (a line segment that virtually extends from the outer edge) and a central line of the second torsion bar <NUM> and the bracket <NUM>. In a case where the frame portion <NUM> and the second torsion bar <NUM> are connected to each other through another element, for example, the connection position A3 is a central portion of a connection portion between the frame portion <NUM> and the other element.

In the frame portion <NUM>, the connection position A1 with each of the connection portions <NUM> is located between the connection position A2 with each of the first torsion bars <NUM> and the connection position A3 with each of the second torsion bars <NUM>. That is, as illustrated in <FIG>, in the frame portion <NUM>, the connection position A1 with one of the connection portions <NUM> is located between the connection position A2 with one of the first torsion bars <NUM> and the connection position A3 with one of the second torsion bars <NUM>. Similarly, in the frame portion <NUM>, the connection position A1 with the other connection portion <NUM> is located between the connection position A2 with the other first torsion bar <NUM> and the connection position A3 with the other second torsion bar <NUM>.

When viewed from the Z-axis direction, an angle θ1 made by a straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 (a straight line that is perpendicular to the Y-axis direction and passes through the center C1 of the main body portion <NUM>) is <NUM>° or less. For example, the angle θ1 is approximately <NUM>°. Similarly, when viewed from the Z-axis direction, an angle made by a straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less.

When viewed from the Z-axis direction, an angle θ2 made by a straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less. For example, the angle θ2 is the same as the angle θ1. Similarly, when viewed from the Z-axis direction, an angle made by a straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less.

A width W of the connection portions <NUM> is larger than the interval G between the main body portion <NUM> and the frame portion <NUM>. In other words, the width W of the connection portions <NUM> is larger than a length T of the connection portions <NUM>. The width W of the connection portions <NUM> is a length of the connection portions <NUM> along an extending direction of the frame portion <NUM>, and is a length of the connection portions <NUM> along a peripheral direction of the frame portion <NUM> in this embodiment. The length T of the connection portions <NUM> is a length of the connection portions <NUM> in a direction perpendicular to the extending direction of the frame portion <NUM>, and is a length of the connection portions <NUM> in a radial direction of the frame portion <NUM> in this embodiment. In this embodiment, the interval G is constant at all positions in the peripheral direction, but the interval G may not constant at all positions in the peripheral direction. For example, a plurality of regions in which the interval G is different in each case may exist. In this case, the width W of the connection portions <NUM> may be larger than a minimum value of the interval G.

The width W of each of the connection portions <NUM> is smaller than any of distances from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. That is, as illustrated in <FIG>, the width W of one of the connection portions <NUM> is smaller than a distance D1 from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to the connection position A2 with one of the first torsion bars <NUM>, and is smaller than a distance D2 from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to the connection position A3 with one of the second torsion bars <NUM>. The distance D1 is smaller than a distance from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to a connection position with the other first torsion bar <NUM>. The distance D2 is smaller than a distance from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to a connection position with the other second torsion bar <NUM>. Accordingly, the width W of one of the connection portions <NUM> is smaller than any of distances from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. Similarly, the width W of the other connection portion <NUM> is smaller than any of distances from the connection position A1 with the other connection portion <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. The distance D1 and D2 are distances along the extending direction of the frame portion <NUM>, and a distance along the peripheral direction of the frame portion <NUM> in this embodiment.

In this embodiment, the width W of each of the connection portions <NUM> is less than <NUM>/<NUM> times any of the distances from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. The width W of the connection portion <NUM> is smaller than a distance D3 (refer to <FIG>) from the inner edge of the first rib portion 115b to the outer edge of the frame portion <NUM> when viewed from the Z-axis direction. For example, the distance D3 is a distance from the inner edge of the first rib portion 115b to the outer edge of the frame portion <NUM> in a direction perpendicular to the extending direction of the frame portion <NUM>.

Each of the connection portions <NUM> is provided not to intersect a straight line LN3 that is perpendicular to a straight line (axial line R2 in <FIG>) that passes through the center C2 of the connection portion <NUM> and the center C1 of the main body portion <NUM> and is in contact with an outer edge of the mirror surface 11a when viewed from the Z-axis direction. That is, in a case where the width W of the connection portion <NUM> is set to be wider than a predetermined width, the connection portion <NUM> intersects the straight line LN3, but in this embodiment, the width of the connection portion <NUM> is set so that the connection portion <NUM> does not intersect the straight line LN3. In other words, the connection portion <NUM> is disposed on an outer side in the Y-axis direction in comparison to the straight line LN3.

In the above-described optical device <NUM>, the movable mirror <NUM> includes the main body portion <NUM>, the frame portion <NUM> that surrounds the main body portion <NUM> with the predetermined interval G from the main body portion <NUM> when viewed from the Z-axis direction, and the pair of connection portions <NUM> which connect the main body portion <NUM> and the frame portion <NUM>. Accordingly, a sectional force from the first torsion bar <NUM> and the second torsion bar <NUM> is less likely to be transmitted to the main body portion <NUM>, and thus it is possible to suppress distortion of the main body portion <NUM>. In addition, because the first rib portion 115b is formed, the thickness of the outer edge portion <NUM> in the Z-axis direction is larger than the thickness of the central portion <NUM> in the Z-axis direction. Accordingly, it is possible to more reliably suppress distortion of the main body portion <NUM>. In addition, because the second rib portion 112b is formed, the thickness of the frame portion <NUM> in the Z-axis direction is larger than the thickness of the central portion <NUM> in the Z-axis direction. Accordingly, it is possible to suppress distortion of the frame portion <NUM>, and it is possible to suppress distortion of the main body portion <NUM> which is caused by the distortion of the frame portion <NUM>.

In addition, in the optical device <NUM>, the width W of each of the connection portions <NUM> is smaller than the distance from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to any of the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. Accordingly, it is possible to secure a distance from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection position with each of the first torsion bars <NUM> and the connection position with each of the second torsion bars <NUM>. As a result, the sectional force from the first torsion bar <NUM> and the second torsion bar <NUM> is further less likely to be transmitted to the main body portion <NUM>, and thus it is possible to more reliably suppress distortion of the main body portion <NUM>. In addition, in the optical device <NUM>, the width W of each of the connection portions <NUM> is larger than the interval G between the main body portion <NUM> and the frame portion <NUM>. Accordingly, it is possible to secure the strength of the connection portions <NUM>, and thus even in a case where distortion of the main body portion <NUM> is suppressed by connecting the main body portion <NUM> and the frame portion <NUM> with the connection portions <NUM>, it is possible to secure the reliability. As described above, according to the optical device <NUM>, it is possible to secure the reliability while suppressing distortion of the movable mirror <NUM>.

In addition, in the optical device <NUM>, in the frame portion <NUM>, the connection position A1 with each of the connection portions <NUM> is located between the connection position A2 with each of the first torsion bars <NUM> and the connection position A3 with each of the second torsion bars <NUM>. According to this configuration, it is also possible to secure the reliability with suppressing distortion of the movable mirror <NUM>.

In addition, in the optical device <NUM>, the pair of connection portions <NUM> are disposed in a point symmetry with respect to the center C1 of the main body portion <NUM> when viewed from the Z-axis direction. Accordingly, it is possible to improve balance of the movable mirror <NUM>, and it is possible to more reliably suppress distortion of the main body portion <NUM>.

In addition, in the optical device <NUM>, the width W of each of the connection portions <NUM> is less than <NUM>/<NUM> times the distance from the connection position with each of the connection portions <NUM> in the frame portion <NUM> to any of the connection position with each of the first torsion bars <NUM> and the connection position with each of the second torsion bars <NUM>. Accordingly, the sectional force from the first torsion bar <NUM> and the second torsion bar <NUM> is further less likely to be transmitted to the main body portion <NUM>, and thus it is possible to more reliably suppress distortion of the main body portion <NUM>.

In addition, in the optical device <NUM>, the width W of each of the connection portions <NUM> is smaller than the distance D3 from the inner edge of the first rib portion 115b to the outer edge of the frame portion <NUM> when viewed from the Z-axis direction. Accordingly, the sectional force from the first torsion bar <NUM> and the second torsion bar <NUM> is further less likely to be transmitted to the main body portion <NUM>, and thus it is possible to more reliably suppress distortion of the main body portion <NUM>.

In addition, in the optical device <NUM>, each of the connection portions <NUM> is provided not to intersect the straight line LN3 that is perpendicular to the axial line R1 that passes through the center C2 of the connection portion <NUM> and the center C1 of the main body portion <NUM>, and is in contact with the outer edge of the mirror surface 11a when viewed from the Z-axis direction. Accordingly, the sectional force from the first torsion bar <NUM> and the second torsion bar <NUM> is further less likely to be transmitted to the main body portion <NUM>, and thus it is possible to more reliably suppress distortion of the main body portion <NUM>.

In addition, in the optical device <NUM>, each of the connection portions <NUM> includes the third rib portion 113b that is formed so that the thickness of each of the connection portions <NUM> in the Z-axis direction is larger than the thickness of the central portion <NUM> in the Z-axis direction. The third rib portion 113b is connected to the first rib portion 115b and the second rib portion 112b. Accordingly, it is possible to suppress distortion of the connection portion <NUM>, and it is possible to suppress distortion of the main body portion <NUM> which is caused by the distortion of the connection portion <NUM>.

In addition, in the optical device <NUM>, when viewed from the Z-axis direction, any of the angle θ1 made by the straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle made by the straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle θ2 made by the straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, and the angle made by the straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less. According to this, it is possible to secure the distance from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM> to be large. As a result, the load (sectional force) from the first torsion bar <NUM> and the second torsion bar <NUM> is further less likely to be transmitted to the main body portion <NUM>, and thus it is possible to more reliably suppress distortion of the main body portion <NUM>. In addition, because it is possible to secure the distance from the axial line R2 to each of the first torsion bars <NUM> and each of the second torsion bars <NUM>, it is possible to suppress rotation of the movable mirror <NUM> around the axial line R2 during movement of the movable mirror <NUM> along the Z-axis direction. In addition, because it is possible to secure the distance between the first torsion bar <NUM> and the second torsion bar <NUM> which are adjacent to each other, it is possible to improve the degree of freedom of design of the movable mirror <NUM>. For example, in a case where the movable comb electrodes <NUM> and <NUM> are disposed along the outer edge of the frame portion <NUM>, it is possible to secure an arrangement space of the movable comb electrodes <NUM> and <NUM>.

In addition, in the optical device <NUM>, the first elastic support unit <NUM> includes the pair of levers <NUM> which are respectively connected to the first torsion bars <NUM>, and the pair of third torsion bars <NUM> which are respectively connected between the pair of levers <NUM> and the base <NUM>. The second elastic support unit <NUM> includes the pair of levers <NUM> which are respectively connected to the pair of second torsion bars <NUM>, and the pair of fourth torsion bars <NUM> which are respectively connected between the pair of levers <NUM> and the base <NUM>. According to this configuration, it is also possible to secure the reliability while suppressing distortion of the movable mirror <NUM>.

Hereinbefore, one embodiment of the present disclosure has been described, but the present disclosure is not limited to the embodiment. The optical device <NUM> may be constituted as in a first modification example illustrated in <FIG>. In the first modification example, the connection positions A2 and A3 between the frame portion <NUM> and each of the first torsion bars <NUM> and each of the second torsion bars <NUM> are located on a side closer to the connection position A1 between the frame portion <NUM> and each of the connection portions <NUM> in comparison to the embodiment. In the first modification example, when viewed from the Z-axis direction, the angle θ1 made by the straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less. For example, the angle θ1 is approximately <NUM>°. Similarly, when viewed from the Z-axis direction, the angle made by the straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less.

When viewed from the Z-axis direction, the angle θ2 made by the straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less. For example, the angle θ2 is the same as the angle θ1. Similarly, when viewed from the Z-axis direction, the angle made by the straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less. In the first modification example, the width W of each of the connection portions <NUM> is also smaller than any of distances from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>.

According to the first modification example, as in the embodiment, it is possible to secure the reliability while suppressing distortion of the movable mirror <NUM>. In addition, in the first modification example, when viewed from the Z-axis direction, any of the angle θ1 made by the straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle made by the straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle θ2 made by the straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, and the angle made by the straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° or less. According to this, it is possible to secure the distance from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM> to be large. As a result, the sectional force from the first torsion bar <NUM> and the second torsion bar <NUM> is further less likely to be transmitted to the main body portion <NUM>, and thus it is possible to more reliably suppress distortion of the main body portion <NUM>. In addition, because it is possible to secure the distance from the axial line R2 to each of the first torsion bars <NUM> and each of the second torsion bars <NUM>, it is possible to suppress rotation of the movable mirror <NUM> around the axial line R2 during movement of the movable mirror <NUM> along the Z-axis direction. In addition, because it is possible to secure the distance between the first torsion bar <NUM> and the second torsion bar <NUM> which are adjacent to each other, it is possible to improve the degree of freedom of design of the movable mirror <NUM>. For example, in a case where the movable comb electrodes <NUM> and <NUM> are disposed along the outer edge of the frame portion <NUM>, it is possible to secure an arrangement space of the movable comb electrodes <NUM> and <NUM>.

The optical device <NUM> may be constituted as in a second modification example illustrated in <FIG>. In the second modification example, the pair of connection portions <NUM> are respectively disposed on one side and on the other side in the X-axis direction with respect to the main body portion <NUM>. The second modification example is constituted in a similar manner as in the first modification example with regard to the other configurations. In the second modification example, the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> is located between connection positions A2 with the first torsion bars <NUM>, or between connection positions A3 with the second torsion bars <NUM>. That is, the connection position A1 with one of the connection portions <NUM> in the frame portion <NUM> is located between the connection positions A2 with the first torsion bars <NUM>. The connection position A1 with the other connection portion <NUM> in the frame portion <NUM> is located between the connection positions A3 with the second torsion bars <NUM>.

In the second modification example, when viewed from the Z-axis direction, the angle θ1 made by the straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° to <NUM>°. For example, the angle θ1 is approximately <NUM>°. Similarly, when viewed from the Z-axis direction, the angle made by the straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° to <NUM>°. When viewed from the Z-axis direction, the angle θ2 made by the straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° to <NUM>°. For example, the angle θ2 is the same as the angle θ1. Similarly, when viewed from the Z-axis direction, the angle made by the straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° to <NUM>°.

In the second modification example, the width W of each of the connection portions <NUM> is also smaller than any of distances from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. That is, as illustrated in <FIG>, the width W of one of the connection portions <NUM> is smaller than a distance D1 from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to the connection position A2 with one of the first torsion bars <NUM>, and is smaller than a distance D2 from the connection position Al with the one connection portion <NUM> in the frame portion <NUM> to the connection position A3 with one of the second torsion bars <NUM>. The distance D1 is the same as a distance from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to a connection position with the other first torsion bar <NUM>. The distance D2 is the same as a distance from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to a connection position with the other second torsion bar <NUM>. Accordingly, the width W of one of the connection portions <NUM> is smaller than any of distances from the connection position A1 with the one connection portion <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. Similarly, the width W of the other connection portion <NUM> is smaller than any of distances from the connection position A1 with the other connection portion <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>.

According to the second modification example, as in the embodiment, it is possible to secure the reliability while suppressing distortion of the movable mirror <NUM>. In addition, in the second modification example, when viewed from the Z-axis direction, any of the angle θ1 made by the straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle made by the straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle θ2 made by the straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, and the angle made by the straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 is <NUM>° to <NUM>°. According to this, it is possible to secure a distance from a connection position with the base <NUM> in the first elastic support unit <NUM> and the second elastic support unit <NUM> to a connection position with the movable mirror <NUM> while securing a distance from the connection position A1 with each of the connection portions <NUM> in the frame portion <NUM> to the connection positions A2 and A3 with each of the first torsion bars <NUM> and each of the second torsion bars <NUM>. As a result, it is possible to realize an increase of a movement amount of the movable mirror <NUM> in the Z-axis direction while suppressing distortion of the main body portion <NUM>. In addition, because it is possible to secure distances from the axial line R2 to each of the first torsion bars <NUM> and each of the second torsion bars <NUM>, it is possible to suppress rotation of the movable mirror <NUM> around the axial line R2 during movement of the movable mirror <NUM> along the Z-axis direction.

In the embodiment and the modification examples, the movable mirror <NUM> may include three or more connection portions <NUM>. For example, the three connection portions <NUM> may be disposed in a point symmetry with respect to the center C1 of the main body portion <NUM> when viewed from the Z-axis direction. The first elastic support unit <NUM> may further include a pair of third levers which extend along the X-axis direction and are disposed on both sides of the pair of levers <NUM> in the Y-axis direction, and a pair of fifth torsion support portions which are respectively connected between the pair of third levers and the base <NUM>. In this case, the pair of third torsion bars <NUM> are respectively connected between the pair of levers <NUM> and the pair of the third levers. Similarly, the second elastic support unit <NUM> may further include a pair of fourth levers which extend along the X-axis direction and are disposed on both sides of the pair of levers <NUM> in the Y-axis direction, and a pair of sixth torsion support portions which are respectively connected between the pair of fourth levers and the base <NUM>. In this case, the pair of fourth torsion bars <NUM> are respectively connected between the pair of levers <NUM> and the pair of third levers.

In the embodiment and the first modification example, when viewed from the Z-axis direction, any of the angle θ1 made by the straight line LN1 that passes through the connection position A2 between the frame portion <NUM> and one of the first torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle made by the straight line that passes through the connection position A2 between the frame portion <NUM> and the other first torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, the angle θ2 made by the straight line LN2 that passes through the connection position A3 between the frame portion <NUM> and one of the second torsion bars <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1, and the angle made by the straight line that passes through the connection position A3 between the frame portion <NUM> and the other second torsion bar <NUM> and the center C1 of the main body portion <NUM>, and the axial line R1 may be <NUM>°. Examples of this example include a configuration in which the movable mirror <NUM> includes a first bracket that protrudes from the frame portion <NUM> to one side in the X-axis direction along the axial line R1, and a second bracket that protrudes from the frame portion <NUM> to the other side in the X-axis direction along the axial line R1, and each of the first torsion bars <NUM> is connected to the first bracket, and each of the second torsion bars <NUM> is connected to the second bracket.

In the embodiment and the modification examples, materials and shapes of respective configurations are not limited to the above-described materials and shapes, and various materials and shapes can be employed. For example, each of the main body portion <NUM> and the mirror surface 11a may have any shape such as a rectangular shape and an octagonal shape when viewed from the Z-axis direction. The frame portion <NUM> may have any ring shape such as a rectangular ring shape and an octagonal ring shape when viewed from the Z-axis direction. In the embodiment, the first torsion support portions are constituted by the plate-shaped first torsion bar <NUM>, but the configuration of the first torsion support portions is not limited to the configuration. The first torsion bars <NUM> may have any shape such as a rod shape. The first torsion support portions may be constituted by connecting a plurality of (for example, two) torsion bars in series through a connection portion. The configurations are also true of the second torsion bars <NUM> (second torsion support portions), the third torsion bars <NUM> (third torsion support portions), and the fourth torsion bars <NUM> (fourth torsion support portions).

Each of the first rib portion 115b, the second rib portion 112b, and the third rib portion 113b (beam portions) may be formed in any shape. For example, the rib portions may linearly extend or may extend in a zigzag shape. The arrangement, the number, the length, the width, and the thickness of the rib portions may be arbitrarily set. The third rib portion 113b may be omitted, and the thickness of the connection portions <NUM> in the Z-axis direction may be the same as the thickness of the central portion <NUM> in the Z-axis direction. In the embodiment, the first rib portion 115b is provided on a surface of the first main body portion 115a on the main surface 12b side, but the first rib portion 115b may be provided on a surface of the first main body portion 115a on the main surface 12a side. This is also true of the second rib portion 112b and the third rib portion 113b.

The brackets <NUM> may be omitted, and the first torsion bars <NUM> may be directly connected to the frame portion <NUM>. Similarly, the brackets <NUM> may be omitted, and the second torsion bars <NUM> may be directly connected to the frame portion <NUM>. The links <NUM> and <NUM> may be omitted. In this case, each of the first optical function unit <NUM> and the second optical function unit <NUM> may be constituted by an opening that is formed in the SOI substrate <NUM>. The first optical function unit <NUM> and the second optical function unit <NUM> may have any shape such as a circular shape and an octagonal shape when viewed from the Z-axis direction. The movable comb electrodes <NUM> and <NUM> may be provided in the movable mirror <NUM>, and may be disposed, for example, along the outer edge of the frame portion <NUM>. The optical device <NUM> may include a movable unit provided with another optical function unit other than the mirror surface 11a instead of the movable mirror <NUM>. Examples of the other optical function unit include a lens. The actuator unit <NUM> is not limited to the electrostatic actuator, and may be, for example, a piezoelectric type actuator, an electromagnetic type actuator, or the like. The optical module <NUM> is not limited to constitute the FTIR, and may constitute another optical system. The optical device <NUM> may be constituted by a member other than the SOI substrate <NUM>, and may be constituted, for example, by a substrate formed from only silicon.

Claim 1:
An optical device (<NUM>) comprising:
a base (<NUM>) that includes a main surface (12a);
a movable unit (<NUM>) that includes an optical function unit (11a); and
a first elastic support unit (<NUM>) and a second elastic support unit (<NUM>) that are connected between the base (<NUM>) and the movable unit (<NUM>), and support the movable unit (<NUM>) so that the movable unit (<NUM>) is movable along a predetermined direction perpendicular to the main surface (12a),
wherein the movable unit (<NUM>) includes a main body portion (<NUM>), a frame portion (<NUM>) that surrounds the main body portion (<NUM>) with a predetermined interval (G) from the main body portion (<NUM>) when viewed from the predetermined direction, and a plurality of connection portions (<NUM>) which connect the main body portion (<NUM>) and the frame portion (<NUM>) to each other,
the first elastic support unit (<NUM>) includes a pair of first torsion support portions (<NUM>) connected to the frame portion (<NUM>),
the second elastic support unit (<NUM>) includes a pair of second torsion support portions (<NUM>) connected to the frame portion (<NUM>),
the main body portion (<NUM>) includes a central portion (<NUM>) provided with the optical function unit (11a), and an outer edge portion (<NUM>),
the outer edge portion (<NUM>) includes a first rib portion (115b) that is formed so that the thickness of the outer edge portion (<NUM>) in the predetermined direction is larger than the thickness of the central portion (<NUM>) in the predetermined direction,
the frame portion (<NUM>) includes a second rib portion (112b) that is formed so that the thickness of the frame portion (<NUM>) in the predetermined direction is larger than the thickness of the central portion (<NUM>) in the predetermined direction, and
a width (W) of each of the plurality of connection portions (<NUM>) is larger than the interval (G), and is smaller than a distance from a connection position with each of the plurality of connection portions (<NUM>) in the frame portion (<NUM>) to any of a connection position with each of the pair of first torsion support portions (<NUM>) and a connection position with each of the pair of second torsion support portions (<NUM>), wherein each of the plurality of connection portions (<NUM>) is connected along the entire width (W) to the main body portion (<NUM>) and to the frame portion (<NUM>).