WO2022190947A1

WO2022190947A1 - Reflector driving device

Info

Publication number: WO2022190947A1
Application number: PCT/JP2022/008515
Authority: WO
Inventors: 寛志長田
Original assignee: アルプスアルパイン株式会社
Priority date: 2021-03-09
Filing date: 2022-03-01
Publication date: 2022-09-15
Also published as: CN116964523A; JP7467761B2; JPWO2022190947A1

Abstract

This reflector driving device (101) comprises: a reflector holding member (4) capable of holding a reflector (1) that bends light; a first support member (5) that supports the reflector holding member (4) such that the reflector holding member (4) can swing about a swinging shaft (SA1); a second support member (6) that supports the first support member (5) such that the first support member (5) can swing about a swinging shaft (SA2); and a drive mechanism (MD) that swings a movable side member (MB) including the reflector holding member (4) with respect to a fixed side member (FB) including the second support member (6). The drive mechanism (MD) includes a plurality of shape memory alloy wires (W) provided between the fixed side member (FB) and the movable side member (MB). The reflector holding member (4) is configured to swing by means of the electrification of the shape memory alloy wires (W).

Description

Reflector drive

The present disclosure relates to a reflector driving device mounted on, for example, a camera-equipped mobile device.

Conventionally, there is known an imaging device provided with an anti-vibration unit that supports a prism so that it can swing around two swing axes (see Patent Document 1). The anti-vibration unit includes a first holder block that holds the prism and can swing about the first swing axis, and a first holder block that swingably supports the first holder block and swings about the second swing axis. It has a movable second holder block and a vibration isolation base that swingably supports the second holder block.

JP 2020-177067 A

This anti-vibration unit has a drive mechanism consisting of a permanent magnet fixed to the first holder block and a coil fixed to the flexible substrate attached to the second holder block.

However, since this anti-vibration unit has a drive mechanism made up of permanent magnets and coils, there is a risk that the weight will increase.

Therefore, it is desirable to provide a reflector driving device that can be made even lighter.

A reflector driving device according to an embodiment of the present invention includes: a reflector holding member capable of holding a reflector that bends light; and a first support that supports the reflector holding member so as to be swingable about a first axis. a movable side including a member, a second support member that supports the first support member so as to be swingable about a second shaft having an axial direction perpendicular to the axial direction of the first shaft, and the reflector holding member. and a drive mechanism for swinging a member with respect to a fixed member including the second support member, wherein the drive mechanism is positioned between the fixed member and the movable member. A plurality of shape memory alloy wires are provided, and the reflector holding member is configured to be swung by energization of the shape memory alloy wires.

With the above-described means, a reflector driving device capable of further weight reduction can be provided.

It is a perspective view of a reflector drive. 2 is a schematic diagram of a camera module including the reflector driver of FIG. 1; FIG. FIG. 2 is an exploded perspective view of the reflector driving device of FIG. 1; It is a perspective view of a fixed side member. It is an exploded perspective view of a fixed side member. It is a front view of a biasing member. It is an exploded perspective view of the movable side member seen from the diagonally upper right front. It is an exploded perspective view of the movable side member seen from the diagonally upper right rear. It is an exploded perspective view of the movable side member seen from the lower right rear. FIG. 11 is a rear view of the combination of the reflector holding member and the first support member; FIG. 4 is a cross-sectional view of a combination of a reflector holding member and a first support member; FIG. 4 is a cross-sectional view of a combination of a reflector holding member and a first support member; FIG. 4 is a front view of the combination of the first support member and the second support member; FIG. 4 is a cross-sectional view of a combination of a first support member and a second support member; FIG. 4 is a cross-sectional view of a combination of a first support member and a second support member; FIG. 11 is a perspective view of a biasing member arranged between a reflector holding member and a second supporting member, as viewed obliquely from the upper right front; FIG. 11 is a perspective view of a biasing member arranged between a reflector holding member and a second supporting member, as viewed obliquely from the upper left front; FIG. 4 is a right side view of a biasing member arranged between a reflector holding member and a second supporting member; It is a perspective view of the right movable side metal member seen from the diagonally upper right front. It is a perspective view of the left movable side metal member seen from diagonally upper left front. FIG. 11 is a perspective view of the right fixed-side metal member as seen obliquely from the upper right front; It is a perspective view of the left fixed side metal member seen from the diagonally upper left front. FIG. 3 is a perspective view of a shape memory alloy wire, a left movable side metal member, and a left stationary side metal member, which constitute the left drive mechanism, when viewed obliquely from the upper right front. FIG. 3 is a perspective view of a shape memory alloy wire, a right movable-side metal member, and a right fixed-side metal member, which constitute a right drive mechanism, when viewed obliquely from the upper right front; It is a perspective view of the electrically-conductive member seen from the diagonally upper right front. FIG. 10 is a perspective view of the conductive member as seen obliquely from the upper right rear side; FIG. 10 is a perspective view of the conductive member embedded in the second support member as viewed obliquely from the upper right front; FIG. 11 is a perspective view of the conductive member embedded in the second support member when viewed obliquely from the rear on the upper right. FIG. 4 is a perspective view of a right drive mechanism; Fig. 10 is a right side view of the third wire, the fourth wire, the right movable-side metal member, and the right fixed-side metal member; Fig. 10 is a right side view of the third wire, the fourth wire, the right movable-side metal member, and the right fixed-side metal member; FIG. 4 is a cross-sectional view of a first support member, a movable-side metal member, a fixed-side metal member, and a shape memory alloy wire;

A reflector driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of the reflector driving device 101. FIG. FIG. 2 is a schematic diagram of a camera module in a camera-equipped mobile device on which reflector driving device 101 is mounted. FIG. 3 is an exploded perspective view of the reflector driving device 101. FIG.

　X1 in each of FIGS. 1 to 3 represents one direction of the X-axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis. Y1 represents one direction of the Y-axis forming the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y-axis. Similarly, Z1 represents one direction of the Z-axis forming the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z-axis. In this embodiment, the X1 side of the reflector driving device 101 corresponds to the front side (front side) of the reflector driving device 101, and the X2 side of the reflector driving device 101 corresponds to the rear side (back side) of the reflector driving device 101. side). The Y1 side of the reflector driving device 101 corresponds to the left side of the reflector driving device 101 , and the Y2 side of the reflector driving device 101 corresponds to the right side of the reflector driving device 101 . The Z1 side of the reflector driving device 101 corresponds to the upper side of the reflector driving device 101 , and the Z2 side of the reflector driving device 101 corresponds to the lower side of the reflector driving device 101 . The same applies to other members in other drawings.

As shown in FIG. 1, the reflector driving device 101 is configured to swing the reflector 1 about the swing axis SA1 and the swing axis SA2. The reflector driving device 101 is used, for example, as an actuator for image stabilization in a camera module. In this embodiment, the swing axis SA1 as the first axis is parallel to the Y-axis, and the swing axis SA2 as the second axis is parallel to the Z-axis. However, the swing axis SA1 as the first axis may be an axis parallel to the Z axis. In this case, the swing axis SA2 as the second axis may be an axis parallel to the Y-axis.

As shown in FIG. 2, the reflector driving device 101 is typically arranged on the side closer to the object than the lens unit LU. It is configured to reach the image sensor IS through the unit LU.

Specifically, as shown in FIG. 3, the reflector driving device 101 is composed of a movable side member MB and a fixed side member FB. The movable-side member MB is accommodated in a housing HS that constitutes the fixed-side member FB. The housing HS, as shown in FIG. 1, is composed of a cover member 2 and a base member (second support member 6). In this embodiment, the cover member 2 is made of non-magnetic metal, and the second support member 6 as the base member is made of synthetic resin.

The reflector driving device 101 is configured so that the movable side member MB can be swung with respect to the fixed side member FB by the driving mechanism MD. Specifically, as shown in FIGS. 1 and 2, the reflector driving device 101 swings the reflector 1 with respect to the housing HS around the swing axis SA1 as indicated by a double arrow AR1, In addition, it is configured to be able to swing about a swing axis SA2 as indicated by a double arrow AR2.

The movable-side member MB is a member supported by the fixed-side member FB, and as shown in FIG. including.

The reflector 1 is an optical element for bending light. Specifically, as shown in FIG. 2, the reflector 1 is configured to reflect the light LT incident from the subject toward the lens unit LU. In this embodiment, the reflector 1 is a prism. The reflector 1 may be a mirror.

The reflector holding member 4 is configured to hold the reflector 1 . In this embodiment, the reflector holding member 4 is made of synthetic resin. The reflector 1 is joined to the reflector holding member 4 with an adhesive.

The first support member 5 is configured to support the reflector holding member 4 so that the reflector holding member 4 can swing around the swing axis SA1 as the first axis. In this embodiment, the first support member 5 is made of synthetic resin.

The movable-side metal member 7 is a member that constitutes the drive mechanism MD. In this embodiment, the movable-side metal member 7 is a metal member to which one end (movable-side end) of the shape memory alloy wire W is attached, and is fixed to the reflector holding member 4 with an adhesive.

The shape memory alloy wire W is a member that constitutes the drive mechanism MD. In this embodiment, the shape memory alloy wires W are wires coated with an electrically insulating material, and include first to fourth wires W1 to W4. The shape memory alloy wire W increases in temperature when current flows, and contracts according to the increase in temperature. The drive mechanism MD can use contraction of the shape memory alloy wire W to swing the movable side member MB (reflector holding member 4) about the swing axis SA1 and the swing axis SA2. In the shape memory alloy wire W, when one or more of the first wire W1 to the fourth wire W4 contract, the movable side member MB swings, and the swinging causes the first wire W1 to the fourth wire W4. is configured to be elongated.

Specifically, the movable-side metal member 7 includes a left movable-side metal member 7L and a right movable-side metal member 7R. The left movable metal member 7L is a metal member to which one end (movable side end) of the first wire W1 and one end (movable side end) of the second wire W2 are attached. is fixed to the left wall of the The right movable metal member 7R is a metal member to which one end (movable side end) of the third wire W3 and one end (movable side end) of the fourth wire W4 are attached. is fixed to the right wall of the

The magnet 11 is a member for detecting the posture of the movable side member MB. In this embodiment, the magnet 11 is fixed to the reflector holding member 4 with an adhesive so as to face the sensor 10 attached to the fixed side member FB. Sensor 10 is a magnetic sensor for detecting a magnetic field generated by magnet 11 . By detecting the magnetic field generated by the magnet 11, the sensor 10 can detect the change in the posture of the reflector holding member 4 to which the magnet 11 is fixed.

Specifically, the magnet 11 includes a left magnet 11L and a right magnet 11R that are spaced apart from each other. The left magnet 11L and the right magnet 11R are formed to have the same shape, weight and size. This is to prevent the weight balance of the movable-side member MB from being adversely affected.

The fixed side member FB is configured to support the movable side member MB. Specifically, the fixed-side member FB includes a wiring board 3, a second support member 6, a fixed-side metal member 8, a sensor 10, and a conductive member 12, as shown in FIGS. 4A and 4B. 4A and 4B show detailed views of the fixed side member FB. Specifically, FIG. 4A is a perspective view of the stationary member FB, and FIG. 4B is an exploded perspective view of the stationary member FB. 4A and 4B, for the sake of clarity, the stationary metal member 8 is given a dot pattern, the conductive member 12 is given a cross pattern, and the illustration of the cover member 2 is omitted. .

The wiring board 3 is a member for connecting each of the drive mechanism MD and the sensor 10 to an external control device having a current supply function. In this embodiment, the wiring board 3 is configured by a flexible wiring board. However, the wiring board 3 may be a rigid wiring board or a rigid flexible wiring board. Also, the wiring board 3 is fixed to the second support member 6 with an adhesive.

The second support member 6 rotates around a swing axis SA2 as a second axis having an axial direction (Z-axis direction) perpendicular to the axial direction (Y-axis direction) of the swing axis SA1 as a first axis. It is configured to support the first support member 5 so that the support member 5 can swing. Further, the second support member 6 is configured such that the conductive member 12 is embedded in the rear wall portion. In this embodiment, the conductive member 12 is a metal member embedded in the second support member 6 by insert molding.

The stationary metal member 8 is a member that constitutes the drive mechanism MD. In this embodiment, the fixed-side metal member 8 is a metal member to which the other end (fixed-side end) of the shape memory alloy wire W is attached, and is fixed to the second support member 6 with an adhesive.

Specifically, the fixed-side metal member 8 includes a left fixed-side metal member 8L and a right fixed-side metal member 8R. The left stationary metal member 8L includes an upper left stationary metal member 8UL and a lower left stationary metal member 8DL. The right stationary metal member 8R includes an upper right stationary metal member 8UR and a lower right stationary metal member 8DR. The upper left fixed-side metal member 8UL is a metal member to which the other end (fixed-side end) of the second wire W2 (see FIG. 3) is attached, and is fixed to the left wall portion of the second support member 6 with an adhesive. ing. The lower left fixed side metal member 8DL is a metal member to which the other end (fixed side end) of the first wire W1 (see FIG. 3) is attached, and is fixed to the left wall portion of the second support member 6 with an adhesive. ing. The upper right fixed-side metal member 8UR is a metal member to which the other end (fixed-side end) of the fourth wire W4 (see FIG. 3) is attached, and is fixed to the right wall portion of the second support member 6 with an adhesive. ing. The lower right fixed metal member 8DR is a metal member to which the other end (fixed end) of the third wire W3 (see FIG. 3) is attached, and fixed to the right wall of the second support member 6 with an adhesive. It is

The sensor 10 is configured to detect the position of the movable side member MB. In this embodiment, the sensor 10 is composed of a Giant Magneto Resistive effect (GMR) element capable of detecting the magnetic field generated by the magnet 11 . However, sensor 10 may include other magnetoresistive elements such as Semiconductor Magneto Resistive (SMR) elements, Anisotropic Magneto Resistive (AMR) elements, or Tunnel Magneto Resistive (TMR) elements. An element may be used to detect the position of the movable member MB. Alternatively, the sensor 10 may be configured to detect the position of the movable member MB using a Hall element.

Specifically, the sensor 10 is attached to the wiring board 3 fixed to the second support member 6 and arranged so as to be immovable relative to the second support member 6 . The sensor 10 includes a left sensor 10L capable of detecting the magnetic field generated by the left magnet 11L and a right sensor 10R capable of detecting the magnetic field generated by the right magnet 11R. The left sensor 10</b>L is arranged so as to be fitted in a left through portion 6</b>HL formed in the bottom wall portion of the second support member 6 while attached to the wiring board 3 . Further, the right sensor 10R is arranged so as to be fitted in the right through portion 6HR formed in the bottom wall portion of the second support member 6 while being attached to the wiring board 3 .

Based on the outputs of the left sensor 10L and the right sensor 10R, the sensor 10 determines the position of the movable member MB swinging about the swing axis SA1 and the swing axis SA2 by a control device (not shown). configured for detection. The control device is, for example, a device external to the reflector driving device 101 .

The biasing member 9 is a member that constitutes the drive mechanism MD. In this embodiment, the biasing member 9 is configured to function as a conductive path for current flowing through the shape memory alloy wire W. As shown in FIG. Further, the movable side member MB is biased by the biasing member 9 and is configured to be pressed against the fixed side member FB. Specifically, the biasing member 9 includes a first biasing member that biases the reflector holding member 4 toward the first support member 5 (X2 side) in the direction parallel to the X axis, and a first support member. and a second biasing member that biases the member 5 toward the second support member 6 (X2 side). In this embodiment, the biasing member 9 is formed of a spring member and serves as both a first biasing member and a second biasing member.

Specifically, the biasing member 9 is composed of a pair of spring members (a left spring member 9L and a right spring member 9R), and functions to bias the reflector holding member 4 toward the X2 side (rear side). 1 and a function of urging the support member 5 toward the X2 side (rear side).

However, the first biasing member and the second biasing member may be independent members. For example, the first biasing member may be composed of one or more spring members, and the second biasing member may be composed of another one or more spring members.

With this configuration, the biasing member 9 can prevent the reflector holding member 4 from moving in the direction away from the swing axis SA1 and prevent the first support member 5 from moving in the direction away from the swing axis SA2. You can prevent it from slipping.

The conductive member 12 is a member that constitutes the drive mechanism MD. In this embodiment, the conductive member 12 includes a left conductive member 12L and a right conductive member 12R, as shown in FIG. 4B. The left conductive member 12L includes a first left conductive member 12L1, a second left conductive member 12L2, and a third left conductive member 12L3. The right conductive member 12R includes a first right conductive member 12R1, a second right conductive member 12R2, and a third right conductive member 12R3.

The first left conductive member 12L1 is configured such that one end (base end) is connected to the wiring board 3 and the other end (tip end) is connected to the upper left stationary metal member 8UL. The second left conductive member 12L2 is configured such that one end is connected to the wiring board 3 and the other end is connected to the left spring member 9L. The third left conductive member 12L3 is configured such that one end is connected to the wiring board 3 and the other end is connected to the lower left stationary metal member 8DL.

Similarly, the first right conductive member 12R1 is configured such that one end is connected to the wiring board 3 and the other end is connected to the upper right fixed side metal member 8UR. The second right conductive member 12R2 is configured such that one end is connected to the wiring board 3 and the other end is connected to the right spring member 9R. The third right conductive member 12R3 is configured such that one end is connected to the wiring board 3 and the other end is connected to the lower right stationary metal member 8DR.

Next, the details of the biasing member 9 will be described with reference to FIG. FIG. 5 is a front view of the biasing member 9. FIG.

The biasing member 9 includes an inner fixing portion 9M fixed to a pedestal portion 4P (see FIG. 3) on the side wall portion of the reflector holding member 4, and a pedestal portion 6P (see FIG. 3) on the side wall portion of the second support member 6. ), and an elastic arm portion 9G connecting the inner fixing portion 9M and the outer fixing portion 9F. Specifically, the biasing member 9 includes a right spring member 9R and a left spring member 9L that are spaced apart. The right spring member 9R and the left spring member 9L are composed of leaf springs.

More specifically, the right spring member 9R includes a right inner fixing portion 9MR fixed to the right pedestal portion 4PR (see FIG. 3) of the right wall portion of the reflector holding member 4, and a right spring member 9R of the second support member 6. It has a right outer fixing portion 9FR fixed to the right pedestal portion 6PR (see FIG. 3) of the wall portion, and a right elastic arm portion 9GR connecting the right inner fixing portion 9MR and the right outer fixing portion 9FR. The right elastic arm portion 9GR includes a right upper elastic arm portion 9GUR that connects the upper end portion of the right inner fixing portion 9MR and the upper end portion of the right outer fixing portion 9FR, and the lower end portion of the right inner fixing portion 9MR and the right outer fixing portion. and a lower right elastic arm portion 9GDR that connects with the lower end portion of 9FR. At least one of the right inner fixing portion 9MR and the right outer fixing portion 9FR may be vertically divided.

Similarly, the left spring member 9L includes a left inner fixing portion 9ML fixed to the left pedestal portion 4PL (not visible in FIG. 3) of the left wall portion of the reflector holding member 4, and a left wall portion of the second support member 6. and a left elastic arm portion 9GL connecting the left inner fixing portion 9ML and the left outer fixing portion 9FL. The left elastic arm portion 9GL includes the upper left elastic arm portion 9GUL connecting the upper end portion of the left inner fixing portion 9ML and the upper end portion of the left outer fixing portion 9FL, and the lower end portion of the left inner fixing portion 9ML and the left outer fixing portion. and a lower left elastic arm portion 9GDL that connects with the lower end portion of 9FL. At least one of the left inner fixing portion 9ML and the left outer fixing portion 9FL may be vertically divided.

In the present embodiment, as shown in FIG. 5, the biasing member 9 has the swing axis SA1 located between the upper left elastic arm portion 9GUL and the left lower elastic arm portion 9GDL in a front view, and the upper right elastic arm portion 9GDL. It is attached to the reflector holding member 4 and the second support member 6 so that the swing axis SA1 is positioned between the elastic arm portion 9GUR and the lower right elastic arm portion 9GDR.

Next, details of the movable-side member MB will be described with reference to FIGS. 6A to 6C. 6A to 6C are exploded perspective views of the movable side member MB viewed from three different angles. Specifically, FIG. 6A is an exploded perspective view of the movable-side member MB as seen obliquely from the upper right front. FIG. 6B is an exploded perspective view of the movable-side member MB seen obliquely from the upper right rear. FIG. 6C is an exploded perspective view of the movable-side member MB as seen obliquely from the lower right rear. 6A to 6C, illustration of the movable metal member 7 is omitted for clarity.

A concave portion 4E capable of accommodating the magnet 11 is formed in the reflector holding member 4. Specifically, as shown in FIG. 6C, the bottom wall portion of the reflector holding member 4 is formed with a left concave portion 4EL capable of accommodating the left magnet 11L and a right concave portion 4ER capable of accommodating the right magnet 11R. .

The reflector holding member 4 and the first support member 5 are connected by the first shaft portion CN1 so that the reflector holding member 4 can swing with respect to the first support member 5.

The first shaft portion CN1 is a mechanism that connects the reflector holding member 4 and the first support member 5 so that the reflector holding member 4 can swing with respect to the first support member 5. It is composed of a concave portion 4S formed in the member 4 and a convex portion 5T formed in the first support member 5. As shown in FIG.

Specifically, the first shaft portion CN1 includes a left shaft portion CN1L and a right shaft portion CN1R. The left shaft portion CN1L is composed of a left concave portion 4SL formed in the rear wall portion of the reflector holding member 4 and a left convex portion 5TL formed in the front end portion of the left wall portion of the first support member 5. there is

Similarly, the right shaft portion CN1R is composed of a right concave portion 4SR formed in the rear wall portion of the reflector holding member 4 and a right convex portion 5TR formed in the front end portion of the right wall portion of the first support member 5. It is configured.

Here, the state of the first shaft portion CN1 when the reflector holding member 4 and the first supporting member 5 are combined will be described with reference to FIGS. 7A to 7C. 7A-7C are detailed views of the combination of reflector holding member 4 and first support member 5. FIG. Specifically, FIG. 7A is a rear view of the combination of the reflector holding member 4 and the first support member 5. FIG. 7B is a cross-sectional view of the combination of the reflector holding member 4 and the first support member 5 on a virtual plane parallel to the XY plane including the line segment L1 in FIG. 7A. FIG. 7C is a cross-sectional view of the combination of the reflector holding member 4 and the first support member 5 on a virtual plane parallel to the XZ plane including the line segment L2 in FIG. 7A. 7A to 7C, the reflector holding member 4 has a rough dot pattern and the first support member 5 has a fine dot pattern for clarity.

As shown in FIGS. 7B and 7C, the left protrusion 5TL has a substantially hemispherical tip, and the left recess 4SL includes a substantially semi-cylindrical concave surface that engages with the left protrusion 5TL. is configured to The same applies to the right concave portion 4SR and the right convex portion 5TR.

With this configuration, when the reflector holding member 4 swings with respect to the first support member 5, it is possible to suppress the vertical displacement of the reflector holding member 4, and it is possible to suppress the horizontal displacement.

Further, as shown in FIGS. 4A and 6A to 6C, the first support member 5 and the second support member 6 are connected to each other by the second shaft portion CN2. It is connected so that it can swing.

The second shaft portion CN2 is a mechanism that connects the first support member 5 and the second support member 6 so that the first support member 5 can swing with respect to the second support member 6. It is composed of a convex portion 5V formed in the member 5 and a concave portion 6S formed in the second support member 6 (see FIG. 4A).

Specifically, the second shaft portion CN2 includes an upper shaft portion CN2U and a lower shaft portion CN2D. The upper shaft portion CN2U is composed of an upper convex portion 5VU formed at the center of the upper end of the outer side (rear side) of the rear wall portion of the first support member 5 and an inner side (front side) of the rear wall portion of the second support member 6. and a concave portion 6S formed in the central portion.

Similarly, the lower shaft portion CN2D includes a lower convex portion 5VD formed at the center portion of the lower end of the outer side (rear side) of the rear wall portion of the first support member 5, and the rear wall portion of the second support member 6. and a concave portion 6S formed in the central portion of the inner side (front side).

Here, the state of the second shaft portion CN2 when the first support member 5 and the second support member 6 are combined will be described with reference to FIGS. 8A to 8C. 8A-8C are detailed views of the combination of the first support member 5 and the second support member 6. FIG. Specifically, FIG. 8A is a front view of the combination of the first support member 5 and the second support member 6. FIG. FIG. 8B is a cross-sectional view of the combination of the first support member 5 and the second support member 6 on a virtual plane parallel to the XY plane containing line L3 in FIG. 8A. FIG. 8C is a cross-sectional view of the combination of the first support member 5 and the second support member 6 on a virtual plane parallel to the XZ plane containing line L4 in FIG. 8A. 8A to 8C, the first supporting member 5 has a fine dot pattern, and the second supporting member 6 has a finer dot pattern, for the sake of clarity.

As shown in FIGS. 8B and 8C, each of the upper convex portion 5VU and the lower convex portion 5VD has a substantially hemispherical tip. It is configured to include a generally semi-cylindrical concave surface that mates with portion 5VD.

With this configuration, when the first support member 5 swings with respect to the second support member 6, the first support member 5 can be prevented from being displaced in the vertical direction and can be prevented from being displaced in the lateral direction.

Next, details of the biasing member 9 will be described with reference to FIGS. 9A, 9B, and 10. FIG. 9A and 9B are perspective views of the biasing member 9 arranged between the reflector holding member 4 and the second supporting member 6. FIG. Specifically, FIG. 9A is a perspective view seen from diagonally upper right front, and FIG. 9B is a perspective view seen from diagonally upper left front. 10 is a right side view of the biasing member 9 arranged between the reflector holding member 4 and the second supporting member 6. FIG. 9A, 9B, and 10, the reflector holding member 4 has a rough dot pattern and the second support member 6 has a fine dot pattern for clarity.

The biasing member 9 includes the right spring member 9R and the left spring member 9L that are spaced apart from each other, as described above. Specifically, the right spring member 9R includes a right inner fixing portion 9MR fixed to the right pedestal portion 4PR of the right wall portion of the reflector holding member 4, and a right pedestal portion 6PR of the right wall portion of the second support member 6. the right outer fixed part 9FR fixed to the right outer fixed part 9FR, the upper right elastic arm part 9GUR connecting the upper end of the right inner fixed part 9MR and the upper end of the right outer fixed part 9FR, the lower end of the right inner fixed part 9MR and the right outer side and a lower right elastic arm portion 9GDR that connects with the lower end portion of the fixed portion 9FR.

In the present embodiment, the right pedestal portion 4PR of the right wall portion of the reflector holding member 4 includes two projecting portions 4AR having a round convex shape projecting forward (X1 direction) from the front side (X1 side) surface. . The projecting portion 4AR corresponds to two through holes formed in the right inner fixing portion 9MR.

Specifically, the right inner fixing portion 9MR is attached and fixed to the right pedestal portion 4PR on which the projecting portion 4AR is formed. Fixing of the right inner fixing portion 9MR to the right pedestal portion 4PR is achieved by applying an adhesive to the projecting portion 4AR inserted through a through hole formed in the right inner fixing portion 9MR.

Further, in the present embodiment, the right pedestal portion 6PR of the right wall portion of the second support member 6 has two projecting portions 6AR in a round convex shape projecting forward (X1 direction) from the front side (X1 side) surface. including. The projecting portion 6AR corresponds to two through holes formed in the right outer fixing portion 9FR.

Specifically, the right outer fixing portion 9FR is attached and fixed to the right base portion 6PR on which the projecting portion 6AR is formed. Fixing of the right outer fixing portion 9FR to the right pedestal portion 6PR is realized by heat caulking the projecting portion 6AR inserted through a through hole formed in the right outer fixing portion 9FR.

In FIG. 9A, the protruding portion 6AR is illustrated in a state in which the tip thereof is deformed after being thermally crimped. The same applies to other drawings illustrating the projecting portion 6AR.

Similarly, the left spring member 9L is fixed to the left inner fixing portion 9ML fixed to the left pedestal portion 4PL of the left wall portion of the reflector holding member 4 and to the left pedestal portion 6PL of the left wall portion of the second support member 6. the left outer fixing part 9FL, the left upper elastic arm part 9GUL connecting the upper end of the left inner fixing part 9ML and the upper end of the left outer fixing part 9FL, the lower end of the left inner fixing part 9ML and the left outer fixing part and a lower left elastic arm portion 9GDL that connects with the lower end portion of 9FL.

In this embodiment, the left pedestal portion 4PL of the left wall portion of the reflector holding member 4 includes two projecting portions 4AL having a round convex shape projecting forward (X1 direction) from the front side (X1 side) surface. . The projecting portion 4AL corresponds to two through holes formed in the left inner fixing portion 9ML.

Specifically, the left inner fixing portion 9ML is attached and fixed to the left pedestal portion 4PL on which the projecting portion 4AL is formed. Fixing of the left inner fixing portion 9ML to the left pedestal portion 4PL is achieved by applying an adhesive to the projecting portion 4AL inserted through a through hole formed in the left inner fixing portion 9ML.

Further, in the present embodiment, the left pedestal portion 6PL of the left wall portion of the second support member 6 has two projecting portions 6AL in a round convex shape projecting forward (X1 direction) from the front side (X1 side) surface. including. The projecting portion 6AL corresponds to two through holes formed in the left outer fixing portion 9FL.

Specifically, the left outer fixing portion 9FL is attached and fixed to the left pedestal portion 6PL on which the projecting portion 6AL is formed. Fixing of the left outer fixing portion 9FL to the left pedestal portion 6PL is realized by thermally crimping the projecting portion 6AL inserted through a through hole formed in the left outer fixing portion 9FL.

In FIG. 9B, the projecting portion 6AL is illustrated in a state where the tip thereof is deformed after being thermally crimped. The same applies to other drawings showing the projecting portion 6AL.

Further, as shown in FIG. 10, the right spring member 9R is a reflector holding member so that the right inner fixing portion 9MR and the right outer fixing portion 9FR are substantially parallel in the initial state where the drive mechanism MD is not driven. 4 and the second support member 6 . Specifically, in the initial state, the right inner fixing portion 9MR and the right outer fixing portion 9FR are arranged with an interval DT1 in the X-axis direction and substantially parallel to each other along the Z-axis direction. It is fixed to the reflector holding member 4 and the second supporting member 6 . The same applies to the left spring member 9L.

With this arrangement, the biasing member 9 constituted by the left spring member 9L and the right spring member 9R can bias the reflector holding member 4 rearward (X2 side) in the initial state, and at the same time, 1 support member 5 can be biased to the rear side (X2 side). In other words, the biasing member 9 can serve as both the first biasing member and the second biasing member. In other words, the biasing member 9 can function as both the first biasing member and the second biasing member.

The drive mechanism MD is a mechanism for swinging the movable side member MB with respect to the fixed side member FB using the shape memory alloy wire W. The drive mechanism MD is composed of a shape memory alloy wire W, a movable metal member 7, a fixed metal member 8, an urging member 9, and a conductive member 12, as shown in FIG. Specifically, the drive mechanism MD includes a left drive mechanism MDL and a right drive mechanism MDR.

The left drive mechanism MDL is composed of a first wire W1, a second wire W2, a left movable metal member 7L, a left fixed metal member 8L, a left spring member 9L, and a left conductive member 12L. The right drive mechanism MDR is composed of a third wire W3, a fourth wire W4, a right movable metal member 7R, a right fixed metal member 8R, a right spring member 9R, and a right conductive member 12R.

Here, the details of the drive mechanism MD will be described with reference to FIGS. 11A to 11D, 12A, 12B, 13A to 13D, 14, 15A, and 15B. 11A and 11B are perspective views of the movable-side metal member 7 that constitutes the drive mechanism MD. 11C and 11D are perspective views of the stationary-side metal member 8 that constitutes the drive mechanism MD. Specifically, FIGS. 11A and 11B are perspective views of the movable-side metal member 7 attached to the reflector holding member 4. FIG. 11C and 11D are perspective views of the stationary metal member 8 attached to the second support member 6. FIG.

More specifically, FIG. 11A is a perspective view of the right movable metal member 7R seen from the upper right front, and FIG. 11B is a perspective view of the left movable metal member 7L seen from the upper left front. FIG. 11C is a perspective view of the right stationary metal member 8R seen obliquely from the upper right front, and FIG. 11D is a perspective view of the left stationary metal member 8L seen from the oblique upper left front.

12A and 12B are perspective views of the shape memory alloy wire W, the movable-side metal member 7, and the fixed-side metal member 8 that constitute the drive mechanism MD. Specifically, FIG. 12A is a perspective view of the first wire W1, the second wire W2, the left movable side metal member 7L, and the left fixed side metal member 8L that constitute the left drive mechanism MDL. FIG. 12B is a perspective view of the third wire W3, the fourth wire W4, the right movable metal member 7R, and the right fixed metal member 8R that constitute the right drive mechanism MDR.

13A to 13D are perspective views of the conductive member 12 that constitutes the drive mechanism MD. Specifically, FIGS. 13A and 13B are perspective views of the conductive member 12 alone. 13C and 13D are perspective views of the conductive member 12 embedded in the second support member 6. FIG.

More specifically, FIG. 13A is a perspective view of a single conductive member 12 seen diagonally from the upper right front, and FIG. 13B is a perspective view of the single conductive member 12 seen diagonally from the upper right rear. FIG. 13C is a perspective view of the conductive member 12 embedded in the second support member 6 seen obliquely from the upper right front side, and FIG. 13D is a perspective view of the conductive member 12 embedded in the second support member 6 seen from the upper right rear side. 1 is a perspective view of a conductive member 12. FIG.

FIG. 14 is a perspective view of the right drive mechanism MDR. 15A and 15B are right side views of the third wire W3, the fourth wire W4, the right movable metal member 7R, and the right fixed metal member 8R that constitute the right drive mechanism MDR.

In FIGS. 11A to 11D, 12A, 12B, and 14, the movable-side metal member 7 and the fixed-side metal member 8 are given fine dot patterns for clarity. Also, in FIGS. 13A-13D and 14, the conductive members 12 are cross-patterned for clarity.

The movable-side metal member 7 includes a left movable-side metal member 7L and a right movable-side metal member 7R, as shown in FIGS. 11A and 11B. The right movable metal member 7R includes, as shown in FIG. 11A, an upper right portion 7UR, a right central portion 7CR, and a lower right portion 7DR. The left movable metal member 7L includes, as shown in FIG. 11B, an upper left portion 7UL, a left central portion 7CL, and a lower left portion 7DL.

Specifically, as shown in FIG. 11A, the upper right portion 7UR is fixed with an adhesive to the end surface of the upper right protrusion 4UR that protrudes rightward from the upper portion of the right wall portion 4R of the reflector holding member 4. 7DR is fixed with an adhesive to the end surface of the lower right projecting portion 4DR that projects rightward from the lower portion of the right wall portion 4R of the reflector holding member 4 . Also, the right central portion 7CR is fitted between the two right pedestal portions 4PR of the reflector holding member 4. As shown in FIG.

Similarly, as shown in FIG. 11B, the upper left portion 7UL is fixed with an adhesive to the end face of the upper left protrusion portion 4UL that protrudes leftward from the upper portion of the left wall portion 4L of the reflector holding member 4, and the lower left portion 7DL is , and is fixed to the end face of a lower left projecting portion 4DL projecting leftward from the lower portion of the left wall portion 4L of the reflector holding member 4 with an adhesive. Also, the left central portion 7CL is fitted between the two left pedestal portions 4PL of the reflector holding member 4. As shown in FIG.

The fixed-side metal member 8 includes a left fixed-side metal member 8L and a right fixed-side metal member 8R, as shown in FIGS. 11C and 11D. The right stationary metal member 8R includes an upper right stationary metal member 8UR and a lower right stationary metal member 8DR, as shown in FIG. 11C. The left stationary metal member 8L includes an upper left stationary metal member 8UL and a lower left stationary metal member 8DL, as shown in FIG. 11D.

Specifically, as shown in FIG. 11C, the upper right stationary metal member 8UR is fixed to the upper portion 6UR of the right wall portion 6R of the second support member 6 with an adhesive, and the lower right stationary metal member 8DR is attached to the second support member 6. 2 is fixed to the lower portion 6DR of the right wall portion 6R of the support member 6 with an adhesive.

Similarly, as shown in FIG. 11D, the upper left stationary metal member 8UL is fixed to the upper portion 6UL of the left wall portion 6L of the second support member 6 with an adhesive, and the lower left stationary metal member 8DL is attached to the second support member. It is fixed to the lower portion 6DL of the left wall portion 6L of 6 with an adhesive.

The movable metal member 7 attached to the reflector holding member 4 and the fixed metal member 8 attached to the second support member 6 are connected to each other by the shape memory alloy wire W as shown in FIGS. 12A and 12B. Concatenated.

Specifically, as shown in FIG. 12A, one end of the first wire W1 is fixed to the left movable metal member 7L by a holding portion J1L formed in the upper left portion 7UL of the left movable metal member 7L. The other end of the wire W1 is fixed to the lower left stationary metal member 8DL by a holding portion J2L formed in the lower left stationary metal member 8DL. Similarly, one end of the second wire W2 is fixed to the left movable metal member 7L by a holding portion J3L formed in the lower left portion 7DL of the left movable metal member 7L, and the other end of the second wire W2 is fixed to the upper left. It is fixed to the upper left fixed side metal member 8UL at a holding portion J4L formed in the side metal member 8UL.

The holding part J1L is one of the holding parts J that hold the shape memory alloy wire W, and is formed by partially bending the upper left part 7UL of the left movable metal member 7L. Specifically, a part of the upper left portion 7UL of the left movable metal member 7L is bent while sandwiching one end of the first wire W1 to form a holding portion J1L. One end of the first wire W1 is fixed to the holding portion J1L by welding. The same applies to the holding portions J2L to J4L.

The first wire W1 and the second wire W2 are arranged to cross each other while maintaining an insulated state. In this embodiment, the first wire W1 and the second wire W2 are arranged so as to be twisted relative to each other, as shown in FIG. 12A. That is, the first wire W1 and the second wire W2 are arranged so as not to contact each other (become non-contact).

Further, as shown in FIG. 12B, one end of the third wire W3 is fixed to the right movable metal member 7R by a holding portion J1R formed in the upper right portion 7UR of the right movable metal member 7R. The other end is fixed to the lower right fixed side metal member 8DR by a holding portion J2R formed in the lower right fixed side metal member 8DR. Similarly, one end of the fourth wire W4 is fixed to the right movable metal member 7R by a holding portion J3R formed in the lower right portion 7DR of the right movable metal member 7R, and the other end of the fourth wire W4 is fixed to the upper right. It is fixed to the upper right fixed side metal member 8UR by a holding portion J4R formed in the side metal member 8UR.

The holding portion J1R is one of the holding portions J that hold the shape memory alloy wire W, and is formed by bending a part of the upper right portion 7UR of the right movable metal member 7R. Specifically, a portion of the upper right portion 7UR of the right movable metal member 7R is bent while sandwiching one end of the third wire W3 to form a holding portion J1R. One end of the third wire W3 is fixed to the holding portion J1R by welding. The same applies to the holding portions J2R to J4R.

The third wire W3 and the fourth wire W4 are arranged to intersect each other while maintaining an insulated state. In this embodiment, as shown in FIG. 12B, the third wire W3 and the fourth wire W4 are arranged so as to be twisted relative to each other. That is, the third wire W3 and the fourth wire W4 are arranged so as not to contact each other (become non-contact).

The conductive member 12 includes a left conductive member 12L and a right conductive member 12R, as shown in FIGS. 13A-13D. The left conductive member 12L includes a first left conductive member 12L1, a second left conductive member 12L2, and a third left conductive member 12L3 that are embedded in the second support member 6 while maintaining insulation from each other. The right conductive member 12R also includes a first right conductive member 12R1, a second right conductive member 12R2, and a third right conductive member 12R3 that are embedded in the second support member 6 while being insulated from each other.

Specifically, the first left conductive member 12L1 is embedded in the second support member 6 so that the terminal portion T1L formed at the proximal end and the connection portion P1L formed at the distal end are exposed. The second left conductive member 12L2 is embedded in the second support member 6 so that the terminal portion T2L formed at the proximal end and the connection portion P2L formed at the distal end are exposed. The third left conductive member 12L3 is embedded in the second support member 6 so that the terminal portion T3L formed at the proximal end and the connection portion P3L formed at the distal end are exposed.

Similarly, the first right conductive member 12R1 is embedded in the second support member 6 so that the terminal portion T1R formed at the proximal end and the connection portion P1R formed at the distal end are exposed. The second right conductive member 12R2 is embedded in the second support member 6 so that the terminal portion T2R formed at the proximal end and the connection portion P2R formed at the distal end are exposed. The third right conductive member 12R3 is embedded in the second support member 6 so that the terminal portion T3R formed at the proximal end and the connection portion P3R formed at the distal end are exposed.

FIG. 14 shows the connection relationship between the third wire W3, the fourth wire W4, the right movable metal member 7R, the right stationary metal member 8R, the right spring member 9R, and the right conductive member 12R.

Specifically, as shown in FIG. 14, the connecting portion P1R of the first right conductive member 12R1 is configured to come into contact with the upper right stationary metal member 8UR, and the connecting portion P2R of the second right conductive member 12R2 The connection portion P3R of the third right conductive member 12R3 is configured to contact the right lower fixed metal member 8DR. The connecting portion P1R, the connecting portion P2R, and the connecting portion P3R are connected to corresponding members by a bonding material such as a conductive adhesive or solder, or by welding. The terminal portion T1R of the first right conductive member 12R1, the terminal portion T2R of the second right conductive member 12R2, and the terminal portion T3R of the third right conductive member 12R3 are all conductive terminals (not shown) formed on the wiring board 3. The pattern is connected by a bonding material. Also, the right inner fixing portion 9MR of the right spring member 9R is connected to the right central portion 7CR of the right movable metal member 7R by a bonding material or by welding.

The same applies to the left conductive member 12L, which is not shown in FIG. Specifically, the connection portion P1L of the first left conductive member 12L1 is configured to come into contact with the upper left stationary metal member 8UL, and the connection portion P2L of the second left conductive member 12L2 is configured to contact the left outer side of the left spring member 9L. The connection portion P3L of the third left conductive member 12L3 is configured to come into contact with the fixed portion 9FL, and is configured to come into contact with the lower left fixed side metal member 8DL. The connecting portion P1L, the connecting portion P2L, and the connecting portion P3L are connected to corresponding members by a bonding material or by welding. Note that the terminal portion T1L of the first left conductive member 12L1, the terminal portion T2L of the second left conductive member 12L2, and the terminal portion T3L of the third left conductive member 12L3 are all formed on the wiring board 3 and are not shown. The pattern is connected by a bonding material. Also, the left inner fixed portion 9ML of the left spring member 9L is connected to the left central portion 7CL of the left movable metal member 7L by a bonding material or by welding.

FIG. 14 shows an example of current flow in the shape memory alloy wire W. Specifically, the dotted arrow in FIG. 14 represents the direction of the current flowing through the third wire W3.

More specifically, as shown in FIG. 14, the right drive mechanism MDR operates when the terminal portion T3R of the third right conductive member 12R3 becomes high potential and the terminal portion T2R of the second right conductive member 12R2 becomes low potential. , from the terminal portion T3R, the connection portion P3R of the third right conductive member 12R3, the lower right stationary metal member 8DR, the third wire W3, the upper right portion 7UR of the right movable metal member 7R, and the right center of the right movable metal member 7R. Through the portion 7CR, the right inner fixing portion 9MR of the right spring member 9R, the right elastic arm portion 9GR of the right spring member 9R, the right outer fixing portion 9FR of the right spring member 9R, and the connection portion P2R of the second right conductive member 12R2, the second A current flows through the terminal portion T2R of the right conductive member 12R2.

Further, in the right drive mechanism MDR, when the terminal portion T1R of the first right conductive member 12R1 becomes high potential and the terminal portion T2R of the second right conductive member 12R2 becomes low potential, the terminal portion T1R is connected to the first right conductive member. Connection portion P1R of 12R1, upper right stationary metal member 8UR, fourth wire W4, lower right portion 7DR of right movable metal member 7R, right central portion 7CR of right movable metal member 7R, right inner fixed portion of right spring member 9R Current flows through the terminal portion T2R of the second right conductive member 12R2 through 9MR, the right elastic arm portion 9GR of the right spring member 9R, the right outer fixing portion 9FR of the right spring member 9R, and the connection portion P2R of the second right conductive member 12R2. is configured as

In addition, in the right drive mechanism MDR, the terminal portion T1R of the first right conductive member 12R1 and the terminal portion T3R of the third right conductive member 12R3 are at a high potential, and the terminal portion T2R of the second right conductive member 12R2 is at a low potential. Then, current flows from the terminal portion T3R to the terminal portion T2R through the third wire W3, and current flows from the terminal portion T1R to the terminal portion T2R through the fourth wire W4.

Although the above description with reference to FIG. 14 relates to the right drive mechanism MDR, it also applies to the left drive mechanism MDL. This is because the left drive mechanism MDL and the right drive mechanism MDR are configured to be bilaterally symmetrical.

15A and 15B show the state of the right movable side metal member 7R when the drive mechanism MD is in the initial state with solid lines. The initial state is a state in which neither the left drive mechanism MDL nor the right drive mechanism MDR is driven, that is, the state of the drive mechanism MD when current is not supplied to any of the first wire W1 to the fourth wire W4. is.

FIG. 15A shows the states of the right movable side metal member 7R, the third wire W3, and the fourth wire W4 when the first support member 5 swings clockwise around the swing axis SA2 in a top view with dashed lines. , and the dotted lines represent the states of the right movable metal member 7R, the third wire W3, and the fourth wire W4 when the first support member 5 swings counterclockwise about the swing axis SA2. .

Specifically, when the drive mechanism MD swings the first support member 5 clockwise around the swing axis SA2 in a top view, as indicated by the block arrow indicated by the dashed line in FIG. 15A, The right movable metal member 7R attached to the right wall portion of the reflector holding member 4 moves forward. This is because the left movable metal member 7L attached to the left wall portion of the reflector holding member 4 moves rearward. More specifically, the first wire W1 and the second wire W2, which are not shown in FIG. As a result of the left movable side metal member 7L (not shown in FIG. 15A) being attracted to the left fixed side metal member 8L (not shown in FIG. 15A), the reflector holding member 4 moves around the swing axis SA2 when viewed from above. , and the right wall portion of the reflector holding member 4 moves forward.

In the present embodiment, when the drive mechanism MD swings the first support member 5 clockwise around the swing axis SA2 in a top view, current flows through the third wire W3 and the fourth wire W4. The magnitude of the current flowing through the first wire W1 and the magnitude of the current flowing through the second wire W2 are adjusted to be substantially the same.

Conversely, when the drive mechanism MD swings the first support member 5 counterclockwise around the swing axis SA2, the reflector holding member is rotated as indicated by the dotted block arrow in FIG. 15A. The right movable metal member 7R attached to the right wall portion of 4 moves rearward. When the third wire W3 and the fourth wire W4 are energized, the third wire W3 and the fourth wire W4 contract, and the right movable side metal member 7R attached to the right wall portion of the reflector holding member 4 becomes the right fixed side metal member. This is because, as a result of being attracted to 8R, the reflector holding member 4 rotates counterclockwise around the swing axis SA2 when viewed from above. In this case, the left movable metal member 7L (not shown in FIG. 15A) attached to the left wall portion of the reflector holding member 4 moves forward. This is because the left wall portion of the reflector holding member 4 moves forward.

In the present embodiment, when the drive mechanism MD swings the first support member 5 counterclockwise around the swing axis SA2 as viewed from the top, current flows through the first wire W1 and the second wire W2. is not supplied, and the magnitude of the current flowing through the third wire W3 and the magnitude of the current flowing through the fourth wire W4 are adjusted to be substantially the same.

FIG. 15B shows the state of the right movable metal member 7R, the third wire W3, and the fourth wire W4 when the reflector holding member 4 swings clockwise around the swing axis SA1 in a right side view. The dashed line represents the state of the right movable metal member 7R, the third wire W3, and the fourth wire W4 when the reflector holding member 4 swings counterclockwise about the swing axis SA1. there is

Specifically, when the drive mechanism MD swings the reflector holding member 4 clockwise around the swing axis SA1 as viewed from the right side, the reflector holding member 4 is rotated as indicated by the dotted arrow in FIG. 15B. The left movable metal member 7L (not shown in FIG. 15B) attached to the left wall portion of the reflector holding member 4 and the right movable metal member 7R attached to the right wall portion of the reflector holding member 4 are connected to the swing shaft. Around SA1, it rotates clockwise in a right side view. That is, the lower left portion 7DL (not shown in FIG. 15B) attached to the lower left projecting portion 4DL of the reflector holding member 4 and the lower right portion 7DR attached to the lower right projecting portion 4DR of the reflector holding member 4 are forward. , the upper left portion 7UL (not shown in FIG. 15B) attached to the upper left protrusion 4UL of the reflector holding member 4 and the upper right portion 7UR attached to the upper right protrusion 4UR of the reflector holding member 4 and move backwards. When the first wire W1 (not shown in FIG. 15B) and the third wire W3 are energized, the first wire W1 and the third wire W3 contract, and the upper left part 7UL attached to the upper left projecting part 4UL of the reflector holding member 4 is pulled toward the upper left fixed metal member 8UL, and the upper right portion 7UR attached to the upper right projecting portion 4UR of the reflector holding member 4 is pulled toward the upper right fixed metal member 8UR. In this case, the lower left portion 7DL attached to the lower left projecting portion 4DL of the reflector holding member 4 and the lower right portion 7DR attached to the lower right projecting portion 4DR of the reflector holding member 4 move forward as described above. . The upper left portion 7UL is drawn toward the upper left fixed metal member 8UL, and the upper right portion 7UR is drawn toward the upper right fixed metal member 8UR. This is because the reflector holding member 4 rotates clockwise and the lower end of the front end portion of the reflector holding member 4 moves forward.

In the present embodiment, when the drive mechanism MD swings the reflector holding member 4 clockwise around the swing axis SA1 as viewed from the right side, the current flows through the second wire W2 and the fourth wire W4. is not supplied, and the magnitude of the current flowing through the first wire W1 and the magnitude of the current flowing through the third wire W3 are adjusted to be substantially the same.

Conversely, when the driving mechanism MD swings the reflector holding member 4 counterclockwise around the swing axis SA1, the left wall portion of the reflector holding member 4 is rotated as indicated by the dashed arrow in FIG. 15B. The left movable metal member 7L (not shown in FIG. 15B) attached to the reflector holding member 4 and the right movable metal member 7R attached to the right wall portion of the reflector holding member 4 are arranged on the right side around the swing axis SA1. Rotate counterclockwise when viewed from the side. That is, the upper left portion 7UL (not shown in FIG. 15B) attached to the upper left protruding portion 4UL of the reflector holding member 4 and the upper right portion 7UR attached to the upper right protruding portion 4UR of the reflector holding member 4 face forward. While moving, the lower left portion 7DL (not shown in FIG. 15B) attached to the lower left protrusion 4DL of the reflector holding member 4 and the lower right portion 7DR attached to the lower right protrusion 4DR of the reflector holding member 4 and move backwards. When the second wire W2 (not shown in FIG. 15B) and the fourth wire W4 are energized, the second wire W2 and the fourth wire W4 contract, and the lower left part 7DL attached to the lower left projecting part 4DL of the reflector holding member 4 is pulled toward the lower left stationary metal member 8DL, and the lower right portion 7DR attached to the lower right projecting portion 4DR of the reflector holding member 4 is pulled toward the lower right stationary metal member 8DR. In this case, the upper left portion 7UL attached to the upper left protrusion 4UL of the reflector holding member 4 and the upper right portion 7UR attached to the upper right protrusion 4UR of the reflector holding member 4 move forward as described above. The lower left portion 7DL is drawn toward the lower left stationary metal member 8DL, and the lower right portion 7DR is drawn toward the lower right stationary metal member 8DR. This is because the reflector holding member 4 rotates counterclockwise when viewed from above, and the upper end of the front end portion of the reflector holding member 4 moves forward.

In the present embodiment, when the drive mechanism MD swings the reflector holding member 4 counterclockwise around the swing axis SA1 as viewed from the right side, the first wire W1 and the third wire W3 are No current is supplied, and the magnitude of the current flowing through the second wire W2 and the magnitude of the current flowing through the fourth wire W4 are adjusted to be substantially the same.

Further, when the rocking of the reflector holding member 4 about the rocking axis SA1 and the rocking of the first support member 5 about the rocking axis SA2 are performed at the same time, typically, the first wire The magnitudes of currents flowing through each of W1 to fourth wire W4 are adjusted to be different from each other. That is, the reflector driving device 101 causes the reflector holding member 4 to swing and swing about the swing axis SA1 by varying the magnitude of the currents flowing through the first to fourth wires W1 to W4. At the same time, the oscillation of the first support member 5 around the driving axis SA2 can be realized.

As described above, the reflector driving device 101 according to this embodiment includes the reflector holding member 4 capable of holding the reflector 1 that bends light, and the reflector holding member 4 as shown in FIG. A first support member 5 that supports the first support member 5 so as to be capable of swinging about a swing shaft SA1 as an axis, and an axial direction (Z-axis direction) perpendicular to the axial direction (Y-axis direction) of the swing shaft SA1. ) and the movable side member MB including the reflector holding member 4 are connected to the fixed side including the second supporting member 6. and a drive mechanism MD that swings with respect to the member FB. The drive mechanism MD includes a plurality of shape memory alloy wires W provided between the fixed side member FB and the movable side member MB. It is configured to be oscillated by energization to. It should be noted that the fact that the axial direction (Y-axis direction) of the swing shaft SA1 and the axial direction (Z-axis direction) of the swing shaft SA2 are perpendicular to each other means that the swing shaft SA1 and the swing shaft having a torsional positional relation SA2 are perpendicular to each other, the oscillation axis SA1 and the oscillation axis SA2 are orthogonal, or the oscillation axis SA1 or the extension of the oscillation axis SA1 and the oscillation axis SA2 or the oscillation It includes being perpendicular to the extension of the axis SA2.

With this configuration, the driving mechanism MD is made up of shape memory alloy wires W instead of a combination of magnets and coils, so the weight of the reflector driving device 101 can be reduced. In addition, this configuration can realize miniaturization of the reflector driving device 101 . Furthermore, since this configuration does not generate a strong magnetic field, it is possible to suppress adverse electromagnetic effects on other devices installed in the surroundings.

As shown in FIGS. 8A to 8C, 9A, and 9B, the plurality of shape memory alloy wires W are first wires W1 and second wires W2 arranged in the first region ZN1, and It may include a third wire W3 and a fourth wire W4 arranged in a second region ZN2 that is spaced apart and opposed. Specifically, the first area ZN1 may be an area on the left side of the left wall of the second support member 6, as shown in FIGS. 8A and 8B. Alternatively, the second area ZN2 may be an area on the right side of the right wall portion of the second support member 6, as shown in FIGS. 8A and 8B. Each of the first to fourth wires W1 to W4 may have one end fixed to the movable member MB and the other end fixed to the fixed member FB, as shown in FIGS. 9A and 9B.

More specifically, as shown in FIG. 9B, the first wire W1 and the second wire W2 are arranged so as to intersect each other when viewed along the axial direction (Y-axis direction) of the swing axis SA1. may be placed. Similarly, as shown in FIG. 9A, the third wire W3 and the fourth wire W4 are arranged so as to cross each other when viewed along the axial direction (Y-axis direction) of the swing axis SA1. may

This configuration allows the four shape memory alloy wires W to swing the reflector holding member 4 around the swing axis SA1 and the swing axis SA2.

As shown in FIGS. 8A and 8B, the first region ZN1 and the second region ZN2 are arranged to face each other across a first plane PS1 perpendicular to the swing axis SA1 and passing through the swing axis SA2. may be In this case, the first region ZN1 is, for example, a substantially rectangular parallelepiped space between the left wall portion of the second support member 6 and the left plate portion of the cover member 2, and the second region ZN2 is, for example, the second 2 is a substantially rectangular parallelepiped space between the right wall portion of the support member 6 and the right plate portion of the cover member 2 . Also, the first plane PS1 is, for example, a virtual plane parallel to the XZ plane including the line segment L4.

This configuration can make the rocking motion of the reflector holding member 4 particularly about the rocking axis SA2 more reliable.

Here, with reference to FIG. 16, the positional relationship between the shape memory alloy wire W and the swing axis SA1 and swing axis SA2 will be described. FIG. 16 is a cross-sectional view of the reflector driving device 101 on the second plane PS2 (see FIG. 10) perpendicular to the swing axis SA2 and passing through the swing axis SA1. Specifically, FIG. 16 shows cross sections of the first supporting member 5, the movable side metal member 7, the fixed side metal member 8, and the shape memory alloy wire W that constitute the reflector driving device 101. FIG. In FIG. 16, illustration of members other than the first support member 5, the movable-side metal member 7, the fixed-side metal member 8, and the shape memory alloy wire W is omitted for clarity.

Desirably, as shown in FIG. 16, the reflector driving device 101 is arranged at the first intersection point N1 to the fourth intersection point N1 to the fourth intersection point N1 on the second plane PS2 (see FIG. 10) regardless of whether or not the shape memory alloy wire W is energized. All of the intersections N4 are located closer to the swing axis SA2 (X2 side) than to the swing axis SA1.

In the example shown in FIG. 16, the first intersection N1 is the intersection of the first wire W1 (first straight line ST1) and the second plane PS2, and the second intersection N2 is the second wire W2 (second straight line ST2). and the second plane PS2, the third intersection N3 is the intersection of the third wire W3 (third straight line ST3) and the second plane PS2, and the fourth intersection N4 is the intersection of the fourth wire W4 (third straight line ST3) and the second plane PS2. 4 straight line ST4) and the second plane PS2.

Strictly speaking, as shown in FIG. 12A, the first straight line ST1 is the position X1U at which one end of the first wire W1 is fixed to the movable side member (holding portion J1L of the upper left portion 7UL of the left movable side metal member 7L). The straight line passes through the position X1D where the other end of the first wire W1 is fixed to the stationary member (holding portion J2L of the lower left stationary metal member 8DL). Further, the second straight line ST2 has a position X2D where one end of the second wire W2 is fixed to the movable side member (holding portion J3L of the lower left part 7DL of the left movable side metal member 7L) and the other end of the second wire W2 is fixed. It is a straight line passing through the position X2U fixed to the side member (the holding portion J4L of the upper left fixed side metal member 8UL).

Further, as shown in FIG. 12B, the third straight line ST3 is a position X3U where one end of the third wire W3 is fixed to the movable side member (holding portion J1R of the upper right portion 7UR of the right movable side metal member 7R) and the third straight line ST3. The straight line passes through a position X3D where the other end of the wire W3 is fixed to the stationary member (holding portion J2R of the lower right stationary metal member 8DR). Further, the fourth straight line ST4 has a position X4D where one end of the fourth wire W4 is fixed to the movable side member (holding portion J3R of the lower right portion 7DR of the right movable side metal member 7R) and the other end of the fourth wire W4 is fixed. It is a straight line passing through the position X4U fixed to the side member (the holding portion J4R of the upper right fixed side metal member 8UR).

More specifically, as shown in FIG. 16, the reflector driving device 101 operates on the second plane PS2 regardless of whether or not the shape memory alloy wire W is energized. Both swing shafts SA2 are configured to be located on the rear side (X2 side) of the swing shaft SA1. In addition, regardless of whether or not the shape memory alloy wire W is energized, the reflector driving device 101 can set the distance DS1 between the first intersection point N1 and the swing axis SA1, and the distance between the second intersection point N2 and the swing axis SA1. A distance DS2 between the third intersection point N3 and the swing axis SA1, a distance DS3 between the fourth intersection point N4 and the swing axis SA1, and a distance DS4 between the fourth intersection point N4 and the swing axis SA1. is configured to be smaller than the distance DS5 between the Note that the distances DS1 to DS5 are all distances in the front-rear direction (direction parallel to the X-axis).

As described above, in the example shown in FIG. 16, the reflector driving device 101 causes the shape memory alloy wire W to contract in the second plane PS2 even when the current is supplied to the shape memory alloy wire W and the shape memory alloy wire W contracts. The alloy wire W is configured so as not to move to the front side of the swing axis SA1. This configuration can make the rocking of the reflector holding member 4 particularly about the rocking axis SA1 more reliable.

12A and 12B, the movable-side member MB includes a first movable-side metal member (left movable-side metal member 7L) and a second movable-side metal member (right movable-side metal member 7L) fixed to the reflector holding member 4. A metal member 7R) may be included. In this case, one end (movable side end) of the first wire W1 and the second wire W2 is fixed to the first movable side metal member (the left movable side metal member 7L), as shown in FIG. 12A. Alternatively, one ends (movable side ends) of the third wire W3 and the fourth wire W4 are each fixed to the second movable side metal member (right movable side metal member 7R) as shown in FIG. 12B. good too.

This configuration ensures that one end (movable side end) of each of the first wire W1 to the fourth wire W4 is fixed to the movable side member MB. Also, in this configuration, one end (movable side end) of the first wire W1 and one end (movable side end) of the second wire W2 are electrically connected via the left movable side metal member 7L. Therefore, it is possible to easily secure conductive paths to the first wires W1 and the second wires W2. The same applies to the third wire W3 and the fourth wire W4.

As shown in FIG. 12A, the other end (fixed-side end) of the first wire W1 is fixed to the first fixed-side metal member (bottom left fixed-side metal member 8DL) that constitutes the fixed-side member FB. Alternatively, the other end (fixed side end) of the second wire W2 may be fixed to a second fixed side metal member (upper left fixed side metal member 8UL) that constitutes the fixed side member FB.

Further, as shown in FIG. 12B, the other end (fixed-side end) of the third wire W3 is fixed to a third fixed-side metal member (bottom right fixed-side metal member 8DR) that constitutes the fixed-side member FB. Alternatively, the other end (fixed side end) of the fourth wire W4 may be fixed to a fourth fixed side metal member (upper right fixed side metal member 8UR) that constitutes the fixed side member FB.

This configuration ensures that the other ends (fixed-side ends) of the first to fourth wires W1 to W4 are securely fixed to the fixed-side member FB.

Between the reflector holding member 4 and the second support member 6, as shown in FIGS. 9A and 9B, at least a first leaf spring (left spring member 9L) and a second leaf spring (right spring member 9R) are provided. may be provided. In this case, the first movable metal member (left movable metal member 7L) may be mechanically and electrically connected to the left spring member 9L. The second movable metal member (right movable metal member 7R) may be mechanically and electrically connected to the right spring member 9R as shown in FIG.

This configuration has the effect of facilitating power supply to the shape memory alloy wire W because it allows the leaf spring to be used as a conductive path.

The second support member 6 may have a first conductive member (second left conductive member 12L2) and a second conductive member (second right conductive member 12R2), as shown in FIGS. 4A and 4B. 5, the left spring member 9L and the right spring member 9R are respectively fixed to a first fixing portion (inner fixing portion 9M) fixed to the reflector holding member 4 and to the second support member 6. and an elastic arm portion 9G connecting the inner fixing portion 9M and the outer fixing portion 9F. In this case, as shown in FIG. 14, the first fixed portion (right inner fixed portion 9MR) of the right spring member 9R may be connected to the second movable metal member (right movable metal member 7R), The second fixing portion (right outer fixing portion 9FR) of the right spring member 9R may be connected to the second conductive member (second right conductive member 12R2). Similarly, the first fixing portion (left inner fixing portion 9ML) of the left spring member 9L may be connected to the first movable metal member (left movable metal member 7L), and the second fixing portion of the left spring member 9L may be connected to the first movable metal member (left movable metal member 7L). The fixing portion (left outer fixing portion 9FL) may be connected to the first conductive member (second left conductive member 12L2).

This configuration enables the conductive member 12 embedded in the second support member 6 to be used as a conductive path, so that it has the effect of further facilitating power supply to the shape memory alloy wire W.

Between the reflector holding member 4 and the second support member 6, as shown in FIGS. 9A and 9B, at least a first leaf spring (left spring member 9L) and a second leaf spring (right spring member 9R) are provided. may be provided. In this case, the left spring member 9L and the right spring member 9R urge the reflector holding member 4 toward the first support member 5 and urge the first support member 5 toward the second support member 6. may be placed.

With this configuration, the first supporting member 5 can be continuously pressed against the swing axis SA2 while the reflector holding member 4 is continuously pressed against the swing axis SA1, so that the reflector holding member 4 can be stably swung. It brings about the effect that it can be supported movably.

Each of the first leaf spring (left spring member 9L) and the second leaf spring (right spring member 9R) is, as shown in FIG. (left inner fixed part 9ML and right inner fixed part 9MR)), a second fixed part (outer fixed part 9F (left outer fixed part 9FL and right outer fixed part 9FR)) fixed to the second support member 6, It may have an elastic arm portion 9G that connects the first fixing portion (the inner fixing portion 9M) and the second fixing portion (the outer fixing portion 9F). In this case, one end of the first wire W1 is electrically connected to the left inner fixing portion 9ML of the left spring member 9L, and one end of the second wire W2 is electrically connected to the left inner fixing portion 9ML of the left spring member 9L. One end of the third wire W3 is electrically connected to the right inner fixing portion 9MR of the right spring member 9R, and one end of the fourth wire W4 is electrically connected to the right inner fixing portion 9MR of the right spring member 9R. It may be electrically connected to the portion 9MR.

A plurality of magnets may be attached to the movable side member MB. In this case, a plurality of magnetic sensors may be attached to the fixed member FB so as to face the plurality of magnets. Specifically, as shown in FIG. 3, a left magnet 11L and a right magnet 11R may be attached to the reflector holding member 4 that constitutes the movable side member MB. In this case, the left sensor 10L is attached to the wiring board 3 attached to the second support member 6 constituting the fixed member FB so as to vertically face the left magnet 11L, and the right magnet 11R is attached to the wiring substrate 3 so as to face the left magnet 11L in the vertical direction. The right sensor 10R may be attached so as to face the .

This configuration can improve the detection accuracy of the posture of the reflector holding member 4 compared to a configuration in which the posture of the reflector holding member 4 is detected by a single magnetic sensor. Specifically, in this configuration, the magnitude of rocking of the reflector holding member 4 about the rocking axis SA1 and the rocking magnitude of the reflector holding member 4 about the rocking axis SA2 are specified with high accuracy. It has the effect of making

Further, the reflector driving device 101 according to the embodiment of the present invention includes, for example, as shown in FIG. A first support member 5 that supports the first support member 5 so as to be capable of swinging around a swing shaft SA1 as a shaft, and a second shaft having an axial direction non-parallel (perpendicular) to the axial direction of the swing shaft SA1. The second supporting member 6 swingably supported around the swinging axis SA2 as and the reflector holding member 4 are swung around the swinging axis SA1, and the first supporting member 5 is swung around the swinging axis SA1. and a drive mechanism MD that swings around SA2. The reflector driving device 101 further includes a first biasing member that biases the reflector holding member 4 toward the first support member 5, and a first biasing member that biases the first support member 5 toward the second support member 6. and a second biasing member. In the example shown in FIG. 3, the biasing member 9 functioning as the first biasing member is arranged in a direction non-parallel (perpendicular) to the axial direction of the swing axis SA1 (direction parallel to the X-axis). 4 to the first support member 5 side (X2 side) and functioning as a second biasing member, the biasing member 9 is arranged in a direction non-parallel (perpendicular) to the axial direction of the swing shaft SA2 (toward the X-axis). parallel direction), the first support member 5 is biased toward the second support member 6 (X2 side).

In this configuration, the reflector driving device 101 urges the reflector holding member 4 toward the first support member 5 side, and urges the first support member 5 toward the second support member 6 side, thereby Backlash between the body holding member 4 and the first support member 5 and backlash between the first support member 5 and the second support member 6 can be suppressed. As a result, the reflector driving device 101 can swing the reflector 1 more stably.

In the example shown in FIG. 3, the first direction in which the first biasing member biases the reflector holding member 4 and the second direction in which the second biasing member biases the first support member 5 are shown. is the same as The first direction and the second direction are perpendicular to the respective axial directions of the swing axis SA1 and the swing axis SA2. That is, the biasing member 9 functioning as a first biasing member biases the reflector holding member 4 rearward in the direction parallel to the X axis, and the biasing member 9 functioning as a second biasing member It urges the first support member 5 rearward in a direction parallel to the axis. This configuration can more reliably suppress rattling between the reflector holding member 4 and the first supporting member 5 . Moreover, this configuration can improve the assembling efficiency of the reflector driving device 101 .

The first biasing member and the second biasing member may be composed of the same spring member provided between the reflector holding member 4 and the second supporting member 6 . That is, the biasing member 9 as a spring member may serve as both the first biasing member and the second biasing member. In other words, the first biasing member may be configured to function also as the second biasing member. This configuration can reduce the number of parts of the reflector driving device 101 compared to the case where the first biasing member and the second biasing member are realized by separate spring members.

As shown in FIG. 5, the biasing member 9 as a spring member is composed of a plate spring, and includes an inner fixing portion 9M as a first fixing portion fixed to the reflector holding member 4 and It may have an outer fixing portion 9F as a second fixing portion to be fixed, and an elastic arm portion 9G connecting the inner fixing portion 9M and the outer fixing portion 9F. The leaf spring is made of a metal plate whose main material is, for example, a copper alloy, a titanium-copper alloy (titanium-copper), or a copper-nickel alloy (nickel-tin-copper). In this case, in the initial state in which the drive mechanism is not driven, the inner fixed portion 9M and the outer fixed portion 9F are substantially parallel. Specifically, as shown in FIG. 10, in the initial state, the inner fixing portion 9M and the outer fixing portion 9F are arranged with an interval DT1 in the X-axis direction, and are substantially spaced apart from each other in the Z-axis direction. arranged in parallel. This configuration can facilitate attachment of the biasing member 9 to the movable-side member MB.

As shown in FIG. 5, the biasing member 9 as a spring member may include a left spring member 9L as a first spring member and a right spring member 9R as a second spring member that are spaced apart from each other. good. In this case, each of the left spring member 9L and the right spring member 9R has two elastic arm portions 9G that connect the inner fixing portion 9M and the outer fixing portion 9F. Specifically, the left spring member 9L has two left elastic arm portions 9GL that connect the left inner fixing portion 9ML and the left outer fixing portion 9FL. Also, the right spring member 9R has two right elastic arm portions 9GR that connect the right inner fixed portion 9MR and the right outer fixed portion 9FR. When viewed from the front, the swing axis SA1 is located between the two left elastic arm portions 9GL (upper left elastic arm portion 9GUL and left lower elastic arm portion 9GDL) of the left spring member 9L, It is positioned between two right elastic arms 9GR (upper right elastic arm 9GUR and lower right elastic arm 9GDR). In the example shown in FIG. 5, each of the left spring member 9L and the right spring member 9R is vertically symmetrical with respect to the swing axis SA1 when viewed from the front. In addition, in the example shown in FIG. 5, the left spring member 9L and the right spring member 9R are symmetrical with respect to the swing axis SA2 when viewed from the front. In this configuration, when the swing axis SA1 is not positioned between the two left elastic arm portions 9GL of the left spring member 9L, or when the swing shaft SA1 is positioned between the two right elastic arm portions 9GR of the right spring member 9R, The biasing member 9 can bias the reflector holding member 4 toward the swing axis SA1 in a more balanced manner than when it is not positioned between them. Therefore, the reflector driving device 101 can swing the reflector 1 more stably.

As shown in FIGS. 4A and 6A to 6C, the reflector driving device 101 includes a first shaft portion CN1 that connects the reflector holding member 4 so as to be capable of swinging about a swing axis SA1, a first support member and a second shaft portion CN2 that connects 5 so as to be able to swing about a swing axis SA2. In this case, in the direction (direction parallel to the X-axis) in which the biasing member 9 as the first biasing member biases the reflector holding member 4, the position of the first shaft portion CN1 and the position of the second shaft portion CN2 is different from In the examples shown in FIGS. 4A and 6A to 6C, the position of the first shaft portion CN1 in the direction parallel to the X-axis is located forward (X1 side) of the position of the second shaft portion CN2. This configuration can reliably prevent the rocking of the reflector holding member 4 about the rocking axis SA1 and the rocking of the first support member 5 about the rocking axis SA2 from interfering with each other. To ensure that each of the oscillations is realized.

Specifically, the first shaft portion CN1 is composed of a portion integrally formed with the reflector holding member 4 and a portion integrally formed with the first support member 5, and/or the second shaft portion CN1. The shaft portion CN2 may be composed of a portion integrally formed with the first support member 5 and a portion integrally formed with the second support member 6 . In the example shown in FIGS. 4A and 6A to 6C, the first shaft portion CN1 includes a concave portion 4S integrally formed in the reflector holding member 4 and a convex portion 5T integrally formed in the first support member 5. and the second shaft portion CN2 is composed of a convex portion 5V formed integrally with the first support member 5 and a concave portion 6S formed integrally with the second support member 6. . This configuration can reduce the manufacturing cost of the shaft portion compared to the case where the shaft portion is configured using balls.

As shown in FIG. 2, the swing axis SA1 is a plane (XZ plane ), and the swing axis SA2 is parallel to the optical axis of the incident light.

The preferred embodiment of the present invention has been described in detail above. However, the invention is not limited to the embodiments described above. Various modifications and replacements may be applied to the above-described embodiments without departing from the scope of the present invention. Also, each of the features described with reference to the above-described embodiments may be combined as appropriate as long as they are not technically inconsistent.

For example, in the above-described embodiment, the first shaft portion CN1 is composed of the concave portion 4S formed in the reflector holding member 4 and the convex portion 5T formed in the first supporting member 5. However, the first shaft portion CN<b>1 may be composed of a convex portion formed in the reflector holding member 4 and a concave portion formed in the first support member 5 .

Similarly, the second shaft portion CN2 is composed of a convex portion 5V formed in the first support member 5 and a concave portion 6S formed in the second support member 6. However, the second shaft portion CN2 may be composed of a concave portion formed in the first support member 5 and a convex portion formed in the second support member 6. As shown in FIG.

At least one of the concave portion and the convex portion may be coated with a lubricating coating, or may be coated with grease.

In the above-described embodiment, the projection 5T formed on the first support member 5 has a semi-hemispherical tip, and the projection 5V formed on the first supporting member 5 has a hemispherical tip. It is designed to be a body. However, at least one of the convex portion 5T and the convex portion 5V may be configured such that the tip thereof has a partial cylindrical shape. In this case, the concave portion corresponding to the convex portion having the partial cylindrical shape may be configured to have a concave surface of the partial cylindrical shape.

At least between the reflector holding member 4 and the first supporting member 5, between the first supporting member 5 and the second supporting member 6, and between the reflector holding member 4 and the second supporting member 6 One may be provided with one or more damping materials. The damping material is, for example, a gel-like damper material formed by curing a fluid adhesive with ultraviolet light or heat. However, the damping material may be made of other materials such as thermosetting resin, UV-curable resin, thermosetting silicone rubber, or UV-curable silicone rubber.

For example, the damping material may be provided between the outer surface of the side wall of the reflector holding member 4 and the inner surface of the side wall of the first support member 5 . Alternatively, the damping material may be provided between the outer surface of the side wall of the reflector holding member 4 and the inner surface of the side wall of the second support member 6 .

Also, in the above-described embodiment, the conductive member 12 is embedded in the second support member 6 by insert molding. may have been

This application claims priority based on Japanese Patent Application No. 2021-037640 filed on March 9, 2021, and the entire contents of this Japanese Patent Application are incorporated herein by reference.

1...Reflector 2...Cover member 3...Wiring board 4...Reflector holding member 4AL, 4AR...Protruding part 4DL...Lower left protruding part 4DR...Lower right protruding part 4E... Recessed part 4EL... Left recessed part 4ER... Right recessed part 4L... Left wall part 4P... Pedestal part 4PL... Left pedestal part 4PR... Right pedestal part 4R... Right wall Part 4S... Recess 4SL... Left recess 4SR... Right recess 4UL... Upper left protrusion 4UR... Upper right protrusion 5... First support member 5T... Protrusion 5TL... Left convex portion 5TR...Right convex portion 5V...Convex portion 5VD...Lower convex portion 5VU...Upper convex portion 6...Second support member 6AL, 6AR...Protruding portion 6DL, 6DR...lower portion 6HL...left through portion 6HR...right through portion 6P...pedestal portion 6PL...left pedestal portion 6PR...right pedestal portion 6S...recessed portion 6UL, 6UR... Upper part 7... Movable side metal member 7CL... Left center part 7CR... Right center part 7DL... Left lower part 7DR... Right lower part 7L... Left movable side metal member 7R... Right movable Side metal member 7UL... Upper left part 7UR... Upper right part 8... Fixed side metal member 8DL... Lower left fixed side metal member 8DR... Lower right fixed side metal member 8L... Left fixed side metal Member 8R... Right fixing side metal member 8UL... Upper left fixing side metal member 8UR... Upper right fixing side metal member 9... Biasing member 9F... Outer fixing part 9FL... Left outer fixing part 9FR...Right outer fixed part 9G...Elastic arm part 9GL...Left elastic arm part 9GDL...Left lower elastic arm part 9GUL...Left upper elastic arm part 9GR...Right elastic arm part 9GDR...・Lower right elastic arm part 9GUR... Upper right elastic arm part 9L... Left spring member 9M... Inner fixed part 9ML... Left inner fixed part 9MR... Right inner fixed part 9R... Right spring Member 10...Sensor 10L...Left sensor 10R...Right sensor 11...Magnet 11L...Left magnet 11R...Right magnet 12...Conductive member 12L...Left conductive member 12L1・1st left conductive member 12L2 2nd left conductive member 12L3 3rd left conductive member 12R right conductive member 12R1 1st right conductive member 12R2 2nd right conductive member 12R3... Third right conductive member 101... Reflector drive unit CN1... First shaft CN1L... Left shaft CN1R... Right shaft CN2... Second shaft CN2D... Lower shaft CN2U... Upper shaft FB... Fixed Side member IS... image sensor　J, J1L, J1R, J2L, J2R, J3L, J3R, J4L, J4R... holding section　LT... light　LU... lens unit　MB... movable side member　MD・... drive mechanism MDL... left drive mechanism MDR... right drive mechanism N1... 1st intersection N2... 2nd intersection N3... 3rd intersection N4... 4th intersection P1L, P1R, P2L, P2R, P3L, P3R...connection portion　PS1...first plane　PS2...second plane　SA1, SA2...swing axis　ST1...first straight line　ST2...second straight line　ST3 ... Third straight line ST4... Fourth straight line T1L, T1R, T2L, T2R, T3L, T3R... Terminal part W... Shape memory alloy wire W1... First wire W2... Second Wire W3... Third wire W4... Fourth wire X1D, X1U, X2D, X2U, X3D, X3U, X4D, X4U... Position

Claims

a reflector holding member capable of holding a reflector that bends light;
a first supporting member that supports the reflector holding member so as to be swingable around a first axis;
a second support member that supports the first support member so as to be swingable about a second shaft having an axial direction perpendicular to the axial direction of the first shaft;
A reflector driving device comprising: a drive mechanism for swinging a movable side member including the reflector holding member with respect to a fixed side member including the second support member,
The drive mechanism includes a plurality of shape memory alloy wires provided between the fixed side member and the movable side member,
The reflector driving device, wherein the reflector holding member is configured to be swung by energization of the shape memory alloy wire.
The plurality of shape memory alloy wires include a first wire and a second wire arranged in a first region, and a third wire and a fourth wire arranged in a second region facing the first region while being separated from each other. including
Each of the first to fourth wires has one end fixed to the movable member and the other end fixed to the fixed member,
The reflector driving device according to claim 1.
The first wire and the second wire are arranged to cross each other,
The third wire and the fourth wire are arranged to cross each other,
3. The reflector driving device according to claim 2.
The first region and the second region are opposed to each other across a first plane that is perpendicular to the first axis and passes through the second axis.
4. The reflector driving device according to claim 2 or 3.
In a second plane perpendicular to the second axis and passing through the first axis,
A first intersection of a first straight line passing through a position where one end of the first wire is fixed to the movable member and a position where the other end of the first wire is fixed to the fixed member and the second plane. ,
A second intersection of a second straight line passing through a position where one end of the second wire is fixed to the movable member and a position where the other end of the second wire is fixed to the fixed member and the second plane. ,
A third intersection of a third straight line passing through a position where one end of the third wire is fixed to the movable member and a position where the other end of the third wire is fixed to the fixed member and the second plane. , and a fourth straight line passing through a position where one end of the fourth wire is fixed to the movable member and a position where the other end of the fourth wire is fixed to the fixed member, and the second plane All of the four intersections are located closer to the second axis than the first axis,
5. The reflector driving device according to claim 4.
the movable-side member includes a first movable-side metal member and a second movable-side metal member fixed to the reflector holding member;
Each of one ends of the first wire and the second wire is fixed to the first movable metal member,
One end of each of the third wire and the fourth wire is fixed to the second movable metal member,
The reflector driving device according to any one of claims 2 to 5.
the other end of the first wire is fixed to a first fixed-side metal member constituting the fixed-side member;
the other end of the second wire is fixed to a second fixed-side metal member constituting the fixed-side member;
the other end of the third wire is fixed to a third fixed-side metal member constituting the fixed-side member;
The other end of the fourth wire is fixed to a fourth fixed-side metal member constituting the fixed-side member,
7. The reflector driving device according to claim 6.
At least a first leaf spring and a second leaf spring are provided between the reflector holding member and the second support member,
The first movable metal member is mechanically and electrically connected to the first leaf spring,
The second movable metal member is mechanically and electrically connected to the second leaf spring,
The reflector driving device according to claim 6 or 7.
The second support member has a first conductive member and a second conductive member,
Each of the first plate spring and the second plate spring includes a first fixing portion fixed to the reflector holding member, a second fixing portion fixed to the second support member, and the first fixing portion. and an elastic arm portion that connects the second fixing portion,
The first fixing portion of the first leaf spring is connected to the first movable metal member,
The second fixing portion of the first leaf spring is connected to the first conductive member,
The first fixed portion of the second leaf spring is connected to the second movable metal member,
The second fixing portion of the second leaf spring is connected to the second conductive member,
The reflector drive device according to claim 8 .
At least a first leaf spring and a second leaf spring are provided between the reflector holding member and the second support member,
The first plate spring and the second plate spring are arranged to bias the reflector holding member toward the first support member and bias the first support member toward the second support member. has been
The reflector driving device according to any one of claims 2 to 7.
Each of the first plate spring and the second plate spring includes a first fixing portion fixed to the reflector holding member, a second fixing portion fixed to the second support member, and the first fixing portion. and an elastic arm portion that connects the second fixing portion,
one end of the first wire is electrically connected to the first fixing portion of the first leaf spring;
one end of the second wire is electrically connected to the first fixing portion of the first leaf spring;
one end of the third wire is electrically connected to the first fixing portion of the second leaf spring;
one end of the fourth wire is electrically connected to the first fixing portion of the second leaf spring;
11. The reflector driving device according to claim 10.
A plurality of magnets are attached to the movable side member,
A plurality of magnetic sensors are attached to the fixed member so as to face the plurality of magnets,
The reflector driving device according to any one of claims 1 to 11.
the first axis is orthogonal to a plane including an optical axis of incident light incident on the reflector and an optical axis of reflected light reflected by the reflector;
the second axis is parallel to the optical axis of the incident light;
The reflector driving device according to any one of claims 1 to 12.