Lens holder drive unit

Abstract

To provide a lens holder drive which is easy to be assembled.SOLUTION: A lens holder drive 101 includes: a base member 2; a lens holder 3 capable of holding a lens body LS; a shaft member 5 extended along a light axis direction so as to be capable of guiding the lens holder 3; and a piezoelectric drive part PD for moving the lens holder 3 along the light axis direction by the movement of a piezoelectric element 8 extended in a direction crossing the light axis direction. The piezoelectric drive part PD is provided in the base member 2. The lens holder 3 includes a reception member 7 that opposes the piezoelectric drive part PD so as to abut on the piezoelectric drive part PD and is extended in a direction crossing an extension direction of the piezoelectric element 8, and receives movement of the piezoelectric element 8. The piezoelectric drive part PD has a contact member 9 on a surface in a side of the lens holder 3 of the piezoelectric element 8, and is energized to a side of the reception member 7 by an energizing member 13 provided in the base member 2 such that the reception member 7 abuts on the contact member 9.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a lens holder driving device. [Background technology]

[0002] Conventionally, a device that uses a piezoelectric element to move a lens holder is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-098580 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned device, the piezoelectric element is attached to the lens holder as the movable member, which requires flexible wiring to supply power to the piezoelectric element, which may make assembly difficult.

[0005] Therefore, it is desirable to provide a lens holder driving device that is easy to assemble. [Means for solving the problem]

[0006] A lens holder driving device according to an embodiment of the present invention comprises a fixed side member, a lens holder capable of holding a lens body, an axial member provided on the fixed side member and extending along the optical axis direction so as to guide the lens holder, and a piezoelectric driving unit having a piezoelectric element extending in a direction intersecting the optical axis direction and moving the lens holder along the optical axis direction by movement of the piezoelectric element, in which the piezoelectric driving unit is provided on the fixed side member, and the lens holder is provided with a receiving member that faces the piezoelectric driving unit so as to come into contact with the piezoelectric driving unit and extends in a direction intersecting the extension direction of the piezoelectric element and receives the movement of the piezoelectric element, and the piezoelectric driving unit has a contact member on the lens holder side surface of the piezoelectric element, and is urged toward the receiving member by a urging member provided on the fixed side member so that the receiving member and the contact member come into contact. [Effects of the Invention]

[0007] By the above means, a lens holder driving device that is easy to assemble is provided. [Brief explanation of the drawings]

[0008] [Figure 1A] FIG. 2 is a perspective view of a lens holder driving device. [Figure 1B] FIG. 2 is an exploded perspective view of the lens holder driving device. [Figure 2] FIG. 2 is a schematic diagram of a camera module. [Figure 3] FIG. [Figure 4A] FIG. 2 is a top view of a lens holder supported by a shaft member. [Figure 4B] FIG. 2 is an exploded perspective view of the lens holder. [Figure 5A] FIG. 10 is a perspective view of a piezoelectric driver being pressed against a receiving member by a biasing member. [Figure 5B] FIG. 10 is an exploded perspective view of a piezoelectric driving unit pressed against a receiving member by a biasing member. [Figure 6] FIG. 10 is a perspective view of a biasing member attached to a base member. [Figure 7] FIG. 10 is a rear view of the structure housed within the housing. [Figure 8A] FIG. 2 is a top perspective view of the magnetic field generating member before the magnetic member is attached to the magnet. [Figure 8B] FIG. 10 is a bottom perspective view of the magnetic field generating member after the magnetic member has been attached to the magnet. [Figure 8C] FIG. 2 is a right side view of the magnetic sensor and the magnetic field generating member. [Figure 8D] FIG. 2 is a bottom view of the magnetic sensor and the magnetic field generating member. [Figure 9] FIG. 2 is a perspective view of a lens holder, a shaft member, a receiving member, a lens body, and a magnetic field generating member. [Figure 10] FIG. 2 is a bottom perspective view of the lens holder. DETAILED DESCRIPTION OF THE INVENTION

[0009] A lens holder driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. Fig. 1A is a perspective view of lens holder driving device 101. Fig. 1B is an exploded perspective view of lens holder driving device 101. Fig. 2 is a schematic diagram of a camera module CM in a camera-equipped mobile device equipped with lens holder driving device 101.

[0010] In the illustrated example, X1 represents one direction of the X axis constituting the three-dimensional Cartesian coordinate system, and X2 represents the other direction of the X axis. Furthermore, Y1 represents one direction of the Y axis constituting the three-dimensional Cartesian coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional Cartesian coordinate system, and Z2 represents the other direction of the Z axis. The X1 side of lens holder driving device 101 corresponds to the front side (subject side) of lens holder driving device 101, and the X2 side of lens holder driving device 101 corresponds to the rear side (image sensor side) of lens holder driving device 101. The Y1 side of lens holder driving device 101 corresponds to the left side of lens holder driving device 101, and the Y2 side of lens holder driving device 101 corresponds to the right side of lens holder driving device 101. Furthermore, the Z1 side of the lens holder driving device 101 corresponds to the upper side of the lens holder driving device 101, and the Z2 side of the lens holder driving device 101 corresponds to the lower side of the lens holder driving device 101. This is the same in the other figures.

[0011] The lens holder driving device 101 is configured to be able to move the lens body LS along the optical axis OA of the lens body LS.

[0012] The lens body LS is an example of an optical element and is composed of one or more lenses. Typically, the lens body LS is a cylindrical lens barrel equipped with at least one lens, and is configured so that its central axis is along the optical axis OA. In the illustrated example, the lens body LS includes a first lens body LS1 that constitutes a zoom lens and a second lens body LS2 that constitutes a focus lens.

[0013] The lens holder driving device 101 is configured to move the lens body LS along the optical axis direction by a piezoelectric driving unit PD (see FIG. 3) housed in a housing HS. The optical axis direction includes the direction of the optical axis OA of the lens body LS and a direction parallel to the optical axis OA. Specifically, the lens holder driving device 101 can move the first lens body LS1 along the optical axis direction as indicated by the double-headed arrow AR1 in each of FIGS. 1B and 2, and can move the second lens body LS2 along the optical axis direction as indicated by the double-headed arrow AR2. In other words, the lens holder driving device 101 can move the first lens body LS1 and the second lens body LS2 separately along the optical axis direction.

[0014] The housing HS is a part of the fixed member FB, and is composed of a cover member 1 and a base member 2.

[0015] As shown in Fig. 2, the lens holder driving device 101 is used in a camera module CM such as a periscope-type camera module. In the example shown in Fig. 2, the camera module CM mainly includes a mirror MR, a lens body LS, the lens holder driving device 101, and an image sensor IS. The mirror MR may be a prism. In the example shown in Fig. 2, the mirror MR is configured to provide a flat reflective surface.

[0016] Typically, the lens holder driving device 101 is positioned farther from the subject than the mirror MR, as shown in Figure 2, and is configured to allow light LT from the subject reflected by the mirror MR to reach the image sensor IS through the lens body LS.

[0017] Next, an overview of the lens holder driving device 101 will be described with reference to Figures 1B and 3. Figure 1B is an exploded perspective view of the lens holder driving device 101, showing a state in which the cover member 1 has been separated from the lower member LM. Figure 3 is an exploded perspective view of the lower member LM, showing a state in which the movable member MB has been separated from the fixed member FB. The movable member MB is configured to be moved in the optical axis direction by a piezoelectric driving unit PD.

[0018] 1B, the lens holder driving device 101 includes a cover member 1, which is part of a fixed member FB (housing HS), and a lower member LM. The cover member 1 is configured to cover the lower member LM. In this embodiment, the cover member 1 is made of a synthetic resin material.

[0019] The base member 2 is a member that constitutes a part of the housing HS. In this embodiment, the base member 2, like the cover member 1, is made of a synthetic resin material.

[0020] Specifically, as shown in FIG. 3, the base member 2 has a bottomed box-like outer shape that defines the storage section 2S. The base member 2 has a substantially rectangular cylindrical outer wall portion 2A and a substantially rectangular, flat bottom surface portion 2B that is continuous with the lower end (the end on the Z2 side) of the outer wall portion 2A. The outer wall portion 2A includes a first side plate portion 2A1 to a fourth side plate portion 2A4. The first side plate portion 2A1 and the third side plate portion 2A3 face each other, and the second side plate portion 2A2 and the fourth side plate portion 2A4 face each other. The second side plate portion 2A2 and the fourth side plate portion 2A4 extend perpendicular to the first side plate portion 2A1 and the third side plate portion 2A3. That is, the first side plate portion 2A1 and the third side plate portion 2A3 extend perpendicular to the second side plate portion 2A2 and the fourth side plate portion 2A4. The first side plate 2A1 has a circular through hole OP1 for receiving light LT from the subject reflected by the mirror MR. Similarly, the third side plate 2A3 has a circular through hole OP2 for allowing the light LT to reach the image sensor IS. The cover member 1 is joined to the base member 2 with an adhesive or the like to form a housing HS together with the base member 2.

[0021] As shown in Fig. 3, a notch 2T is formed in the fourth side plate portion 2A4 of the base member 2 for passing a terminal portion 4T of the board 4 therethrough. As shown in Figs. 1A and 1B, the base member 2 has a plug member 2P for closing the notch 2T. In the illustrated example, the plug member 2P is fitted into the notch 2T and fixed with an adhesive. For clarity, the plug member 2P is not shown in Fig. 3.

[0022] As shown in FIG. 3, the lower member LM includes a lens holder 3 as a movable member MB, a base member 2 as a fixed member FB, a substrate 4, and a shaft member 5, and a piezoelectric driver PD.

[0023] The lens holder 3 is configured to hold the lens body LS. In the illustrated example, the lens holder 3 is formed by injection molding a synthetic resin such as liquid crystal polymer (LCP). The lens holder 3 includes a first lens holder 3A configured to hold the first lens body LS1, and a second lens holder 3B configured to hold the second lens body LS2. The first lens holder 3A and the second lens holder 3B have the same shape and size. Therefore, the components can be shared, which reduces costs.

[0024] Here, the lens holder 3 will be described in detail with reference to FIGS. 4A and 4B. FIG. 4A is a top view of the lens holder 3 supported by the shaft member 5. FIG. 4B is an exploded perspective view of the second lens holder 3B. The description with reference to FIG. 4B relates to the second lens holder 3B, but also applies to the first lens holder 3A. Note that in FIG. 4A, for clarity, a coarse dot pattern is applied to the first lens holder 3A, and a fine dot pattern is applied to the second lens holder 3B. Also, in FIG. 4B, for clarity, a fine dot pattern is applied to the second lens holder 3B.

[0025] The shaft member 5 includes a first shaft member 5A having an axis (axis 5AX) parallel to the optical axis OA and a second shaft member 5B having an axis (axis 5BX) parallel to the optical axis OA. Therefore, the first shaft member 5A and the second shaft member 5B extend parallel to each other in the optical axis direction. In the illustrated example, one end of the shaft member 5 is fitted into a groove formed in the first side plate portion 2A1 of the base member 2, and the other end is fitted into a groove formed in the third side plate portion 2A3 of the base member 2. However, the shaft member 5 may be configured such that one end is inserted into a round through-hole (not shown) formed in the first side plate portion 2A1 of the base member 2, and the other end is inserted into a round through-hole (not shown) formed in the third side plate portion 2A3 of the base member 2. The shaft member 5 may be fixed to the base member 2 with an adhesive.

[0026] 4A and 4B, the lens holder 3 has a holding portion 31 that holds the lens body LS, and a bearing portion 32 that receives the shaft member 5. The bearing portion 32 has a left bearing portion 32L that receives the first shaft member 5A, and a right bearing portion 32R that receives the second shaft member 5B. The bearing portion 32 functions as a rotation stopper that stops the lens holder 3 from rotating around the shaft member 5.

[0027] Specifically, the first lens holder 3A has a first holding portion 31A that holds the first lens body LS1, and a first bearing portion 32A that receives the shaft member 5. The first bearing portion 32A has a left bearing portion 32L (first left bearing portion 32AL) that receives the first shaft member 5A, and a right bearing portion 32R (first right bearing portion 32AR) that receives the second shaft member 5B.

[0028] Similarly, the second lens holder 3B has a second holding portion 31B that holds the second lens body LS2, and a second bearing portion 32B that receives the shaft member 5. The second bearing portion 32B has a left bearing portion 32L (second left bearing portion 32BL) that receives the first shaft member 5A, and a right bearing portion 32R (second right bearing portion 32BR) that receives the second shaft member 5B.

[0029] More specifically, the second right bearing portion 32BR has a round through hole TH capable of receiving the second shaft member 5B, as shown in Fig. 4B. The same applies to the first left bearing portion 32AL.

[0030] On the other hand, the second left bearing portion 32BL has a notch CT that opens to the left (Y1 direction) and can receive the first shaft member 5A, as shown in Figure 10. The same is true for the first right bearing portion 32AR.

[0031] A receiving member 7 is fixed to one of the two bearing portions 32 in each of the first lens holder 3A and the second lens holder 3B. The receiving member 7 is a member arranged to come into contact with the contact member 9 (see FIG. 3) of the piezoelectric driving unit PD, and includes a first receiving member 7A having an axis 7AX parallel to the optical axis OA and a second receiving member 7B having an axis 7BX parallel to the optical axis OA.

[0032] In the illustrated example, the receiving member 7 is made of a rod-like (approximately cylindrical) material separate from the lens holder 3. Specifically, the lens holder 3 is made of liquid crystal polymer (LCP), and the receiving member 7 is made of metal. However, the receiving member 7 may be a part of the lens holder 3. In this case, the receiving member 7 may be made of the same material as the lens holder 3 and integrated with the lens holder 3. The receiving member 7 may also have another shape, such as an elliptical cylindrical shape or a rectangular cylindrical shape. Alternatively, the receiving member 7 may be plate-shaped.

[0033] 4, a first receiving member 7A is fixed to a first left bearing portion 32AL of a first lens holder 3A, and a second receiving member 7B is fixed to a second right bearing portion 32BR of a second lens holder 3B. That is, in the example shown in Fig. 4A, the first lens holder 3A and the second lens holder 3B are arranged so as to have two-fold rotational symmetry with respect to a center line CL (a line parallel to the Z axis) of the lens holder driving device 101.

[0034] Furthermore, the bearing portion 32 to which the receiving member 7 is fixed is formed so that its length in the optical axis direction is longer than that of the holding portion 31. In the example shown in Fig. 4A, the first left bearing portion 32AL to which the first receiving member 7A is fixed is formed so that its width W1, which is its dimension in the optical axis direction, is larger than the width W2 of the first holding portion 31A and is also larger than the width W3 of the first receiving member 7A.

[0035] On the other hand, the first right bearing portion 32AR is formed so that its width W4 is smaller than the width W2 of the first holding portion 31 A. In addition, the first right bearing portion 32AR is formed at the front end portion (the end portion on the X1 side) of the first holding portion 31 A so that the first right bearing portion 32AR and the second right bearing portion 32BR do not come into contact with each other when the first lens holder 3A and the second lens holder 3B approach each other.

[0036] Similarly, the second right bearing portion 32BR to which the second receiving member 7B is fixed is formed so that its width W5 is larger than the width W6 of the second holding portion 31B and also larger than the width W7 of the second receiving member 7B.

[0037] On the other hand, the second left bearing portion 32BL is formed so that its width W8 is smaller than the width W6 of the second holding portion 31B. In addition, the second left bearing portion 32BL is formed at the rear end portion (the end portion on the X2 side) of the second holding portion 31B so that the first left bearing portion 32AL and the second left bearing portion 32BL do not come into contact with each other when the first lens holder 3A and the second lens holder 3B approach each other.

[0038] With the above-described configuration, the first lens holder 3A and the second lens holder 3B can be arranged such that, when the first holding portion 31A and the second holding portion 31B are close to each other, at least a portion of the first left bearing portion 32AL and a portion of the second right bearing portion 32BR overlap each other in the optical axis direction. In the state shown in Fig. 4A, the first left bearing portion 32AL and the second right bearing portion 32BR of the first lens holder 3A and the second lens holder 3B are partially in the same position in the optical axis direction, so that the first receiving member 7A and the second receiving member 7B overlap each other over a width W9 in the optical axis direction.

[0039] Therefore, this configuration has the effect of enabling the first lens body LS1 and the second lens body LS2 to be brought close to each other to the extent that they are almost in contact with each other, while ensuring that the width W1 of the first left bearing portion 32AL is larger than the width W2 of the first holding portion 31A and the width W5 of the second right bearing portion 32BR is larger than the width W6 of the second holding portion 31B.

[0040] In the illustrated example, the first lens holder 3A and the second lens holder 3B are configured to have the same size and shape. Therefore, widths W1 and W5 are equal, widths W2 and W6 are equal, widths W3 and W7 are equal, and widths W4 and W8 are equal. However, widths W1 and W5 may be different in size, widths W2 and W6 may be different in size, widths W3 and W7 may be different in size, and widths W4 and W8 may be different in size.

[0041] Next, the piezoelectric driver PD will be described with reference to Figures 5A, 5B, and 6. Figure 5A is a perspective view of the piezoelectric driver PD being pressed against the receiving member 7 by the biasing member 13, and Figure 5B is an exploded perspective view of the piezoelectric driver PD being pressed against the receiving member 7 by the biasing member 13. Figure 6 is a perspective view of the biasing member 13 attached to the base member 2. For clarity, a dot pattern is applied to the biasing member 13 in Figure 6.

[0042] The piezoelectric driving unit PD is configured to be able to move the lens holder 3 along the optical axis direction. In this embodiment, the piezoelectric driving unit PD is an example of a friction driving unit that uses the driving system disclosed in U.S. Patent No. 7,786,648, and includes a piezoelectric element 8, a contact member 9, and a circuit board 10.

[0043] The piezoelectric driver PD is configured to be biased inward (toward the optical axis OA) by a biasing member 13 fixed to the base member 2 and pressed against the receiving member 7. In the illustrated example, the biasing member 13 is formed of a metal plate and configured to come into contact with the outer surface (the side farther from the optical axis OA) of the piezoelectric element 8 via the circuit board 10 at portions (inner edge portions BE) corresponding to two nodes ND (see FIG. 5B) formed during bending vibration (circular motion, described later) of the piezoelectric element 8. The biasing member 13 and the piezoelectric driver PD are joined together by, for example, an adhesive.

[0044] 3, the piezoelectric driver PD includes a first piezoelectric driver PD1 that moves the first lens holder 3A along the optical axis direction and a second piezoelectric driver PD2 that moves the second lens holder 3B along the optical axis direction. The first piezoelectric driver PD1 includes a first piezoelectric element 8A, a first contact member 9A, and a first circuit board 10A, and the second piezoelectric driver PD2 includes a second piezoelectric element 8B, a second contact member 9B, and a second circuit board 10B.

[0045] The biasing member 13 includes a first biasing member 13A arranged to press the first piezoelectric driving unit PD1 against the first receiving member 7A, and a second biasing member 13B arranged to press the second piezoelectric driving unit PD2 against the second receiving member 7B.

[0046] 5A and 5B show the first piezoelectric driver PD1 pressed against the first receiving member 7A by the first biasing member 13A. However, the following description with reference to Figs. 5A and 5B also applies to the second piezoelectric driver PD2 pressed against the second receiving member 7B by the second biasing member 13B. This is because the first piezoelectric driver PD1 and the second piezoelectric driver PD2 have the same configuration.

[0047] In the illustrated example, the first piezoelectric element 8A extends in the Z-axis direction (perpendicular to the optical axis OA) perpendicular to the optical axis (X-axis direction) and is configured to realize bending vibration (circular motion) with two nodes ND. Specifically, the first piezoelectric element 8A has a two-layer structure consisting of a first layer that realizes a first bending vibration on the XZ plane and a second layer that realizes a second bending vibration on the YZ plane. The first piezoelectric driver PD1 applies voltages to the piezoelectric elements constituting the first layer and the piezoelectric elements constituting the second layer at appropriate timings, respectively, so that the locus traced by the midpoint of the first piezoelectric element 8A forms a circular orbit centered on the rotation axis 8AX. In other words, the first piezoelectric element 8A can realize a motion in which its midpoint traces a circle (circular motion). In the example shown in FIG. 5B, the rotation axis 8AX is parallel to the Z-axis. By applying voltage at an appropriate timing, the first piezoelectric driver PD1 can switch the movement direction (rotation direction) of the midpoint of the circular orbit between clockwise and counterclockwise as viewed from the Z1 side. Note that the circle (circular orbit) described by the midpoint of the first piezoelectric element 8A does not have to be a perfect circle (true circle), as long as it is approximately circular.

[0048] In FIG. 5B, the dotted arrows drawn around the first piezoelectric element 8A indicate that the first piezoelectric element 8A undergoes bending vibration (circular motion) (the first piezoelectric element 8A rotates clockwise around the rotation axis 8AX while bending). In this case, the first receiving member 7A (first lens holder 3A) in contact with the first contact member 9A of the first piezoelectric drive unit PD1 including the first piezoelectric element 8A moves forward (in the X1 direction). Although not shown, the first piezoelectric element 8A can also rotate counterclockwise around the rotation axis 8AX while bending. In this case, the first receiving member 7A (first lens holder 3A) in contact with the first contact member 9A moves backward (in the X2 direction).

[0049] That is, the first lens holder 3A (first receiving member 7A) is moved forward (in the X1 direction) when the rotation direction of the midpoint of the first piezoelectric element 8A is clockwise, and is moved backward (in the X2 direction) when the rotation direction of the midpoint of the first piezoelectric element 8A is counterclockwise. The midpoint of the first piezoelectric element 8A is the point where the amplitude of the first bending vibration is maximum (the point corresponding to the antinode of the first bending vibration), and is also the point where the amplitude of the second bending vibration is maximum (the point corresponding to the antinode of the second bending vibration).

[0050] The first contact member 9A is attached to the first piezoelectric element 8A and configured to come into contact with the first receiving member 7A. In the illustrated example, the first contact member 9A is bonded to the inner surface of the first piezoelectric element 8A with an adhesive so as to cover the entire inner surface (the Y2 side facing the optical axis OA) of the first piezoelectric element 8A. The first contact member 9A is formed of a metal such as stainless steel and configured with an appropriate thickness so that it can perform bending vibration (circular motion) in response to the bending vibration (circular motion) of the first piezoelectric element 8A. In the illustrated example, the first contact member 9A is a friction plate made of stainless steel. The first contact member 9A extends in the Z-axis direction, which is the same direction as the extension direction of the first piezoelectric element 8A. The first contact member 9A is configured so that a central portion in the extension direction comes into contact with the first receiving member 7A attached to the first lens holder 3A. Specifically, the first contact member 9A is configured to contact the first receiving member 7A at a portion where the amplitude of the bending vibration (circular motion) is maximum (a portion corresponding to the antinode of the bending vibration). The first contact member 9A has a curved (cylindrical) surface (Y2-side surface) that contacts the first receiving member 7A. The first receiving member 7A is made of a metal such as stainless steel. In the illustrated example, the first receiving member 7A is a cylindrical rod member made of stainless steel and extending in the optical axis direction. The reason for bringing the metal first contact member 9A into contact with the metal first receiving member 7A is to prevent wear of the first lens holder 3A due to contact between the synthetic resin first contact member 9A and the metal first receiving member 7A. Note that, as long as contact between the first contact member 9A and the first receiving member 7A is achieved, the length of the first contact member 9A in the Z-axis direction may be different from the length of the first piezoelectric element 8A.

[0051] The first circuit board 10A is a board including a conductive pattern and is configured to electrically connect an external power source to the first piezoelectric element 8A. In the illustrated example, the first circuit board 10A is a flexible printed circuit board having flexibility, one end of which is connected to the substrate 4 and configured to apply a voltage to the first piezoelectric element 8A. The first piezoelectric element 8A is bonded to the surface of the inner side of the first circuit board 10A (the Y2 side facing the optical axis OA) with an anisotropic conductive adhesive. The first piezoelectric element 8A may also be bonded to the inner side of the first circuit board 10A with an anisotropic conductive adhesive film.

[0052] In the illustrated example, the biasing member 13 is configured by a leaf spring member. Specifically, as shown in FIG. 5B, the first biasing member 13A has a fixed portion 13F fixed to the base member 2, a support portion 13S supporting the first piezoelectric driver PD1, and an elastically deformable elastically deformable portion 13E provided between the fixed portion 13F and the support portion 13S. The biasing member 13 is fixed to the base member 2 via the fixed portion 13F so that the support portion 13S and the elastically deformable portion 13E do not come into contact with the base member 2. The following description with reference to FIG. 5B relates to the first biasing member 13A, but also applies to the second biasing member 13B. This is because the second biasing member 13B has the same shape and size as the first biasing member 13A.

[0053] Specifically, the fixed portion 13F includes a front fixed portion 13FF and a rear fixed portion 13FB, and the support portion 13S includes an upper support portion 13SU and a lower support portion 13SD. The elastic deformation portion 13E includes a front elastic deformation portion 13EF provided between the front fixed portion 13FF and the upper support portion 13SU and the lower support portion 13SD, respectively, and a rear elastic deformation portion 13EB provided between the rear fixed portion 13FB and the upper support portion 13SU and the lower support portion 13SD, respectively. The front fixed portion 13FF and the rear fixed portion 13FB have the same shape and size, the upper support portion 13SU and the lower support portion 13SD have the same shape and size, and the front elastic deformation portion 13EF and the rear elastic deformation portion 13EB have the same shape and size. That is, the first biasing member 13A is configured to be plane-symmetrical with respect to a plane of symmetry parallel to the YZ plane (a plane that bisects the first biasing member 13A into front and back). The first biasing member 13A is also configured to be plane-symmetrical with respect to another plane of symmetry parallel to the XY plane (a plane that bisects the first biasing member 13A into top and bottom). The same is true for the second biasing member 13B.

[0054] In the illustrated example, the front-side elastic deformation portion 13EF is connected to the front-side fixed portion 13FF via a pair of upper and lower elastic arms. However, it may be connected to the front-side fixed portion 13FF via a single elastic arm or three or more elastic arms. The elastic arms are configured to extend linearly along the optical axis direction, but may have any shape, including curved portions. The same applies to the rear-side elastic deformation portion 13EB. In the illustrated example, the front-side fixed portion 13FF is configured to connect the respective ends of the pair of upper and lower elastic arms of the front-side elastic deformation portion 13EF. However, it is not necessarily required to connect the respective ends of the pair of upper and lower elastic arms. In other words, the front-side fixed portion 13FF may be composed of two or more separate, independent portions. The same applies to the rear-side fixed portion 13FB.

[0055] The support portion 13S has a base portion 13K connected to the elastic deformation portion 13E, and a bent portion 13N bent from the base portion 13K in an L-shape and protruding toward the side (Y2 side) where the lens holder 3 is located. A recess RS is formed at the tip of the bent portion 13N. The recess RS is a recess that is open toward the side (Y2 side) where the lens holder 3 is located. Specifically, the base portion 13K includes an upper base portion 13KU that is a part of the upper support portion 13SU, and a lower base portion 13KD that is a part of the lower support portion 13SD. The bent portion 13N also includes an upper bent portion 13NU that is a part of the upper support portion 13SU, and a lower bent portion 13ND that is a part of the lower support portion 13SD. The recess RS is formed at the tip of each of the upper bent portion 13NU and the lower bent portion 13ND, and has the same shape and size. As shown in FIG. 5A, the first piezoelectric driving part PD1 is partially disposed within the recessed part RS and is fixed to the bent part 13N with adhesive while being in contact with the inner edge part BE of the recessed part RS.

[0056] More specifically, the recess RS has a front edge and a rear edge that face each other with an inner edge BE therebetween, as shown in Fig. 5B, and the first piezoelectric driver PD1 is disposed between the front edge and the rear edge, as shown in Fig. 5A.

[0057] The position where the inner edge BE of the recess RS contacts the first piezoelectric driver PD1 corresponds to the position of the node ND of the first piezoelectric element 8A that realizes bending vibration. The position of the node ND includes the position of the first node ND1 and the position of the second node ND2. In FIG. 5B, for clarity, the position of the node ND is marked with a cross pattern.

[0058] The position where the inner edge BE of the recess RS contacts the first piezoelectric driver PD1 (the position of the node ND) corresponds to a position at a predetermined distance from the end of the first piezoelectric driver PD1, which is, for example, approximately one-quarter of the total length of the piezoelectric driver PD.

[0059] The first piezoelectric drive unit PD1 and the bent portion 13N are fixed together with an adhesive. Specifically, the first piezoelectric drive unit PD1 (first circuit board 10A) and the bent portion 13N are fixed together with an adhesive at the inner edge portion BE of the recess RS. Furthermore, the first circuit board 10A of the first piezoelectric drive unit PD1 and the first biasing member 13A are fixed together with an adhesive at the contact portion AF of the front elastic deformation portion 13EF and the contact portion AB of the rear elastic deformation portion 13EB. In the illustrated example, the adhesive is an ultraviolet-curing adhesive. However, the adhesive may be of another type, such as a moisture-curing or heat-curing adhesive.

[0060] 5B, the two elastic deformation portions 13E extend in directions away from each other from the corresponding base portion 13K. Specifically, the front elastic deformation portion 13EF extends forward (in the X1 direction) from the upper base portion 13KU and the lower base portion 13KD, and the rear elastic deformation portion 13EB extends rearward (in the X2 direction) from the upper base portion 13KU and the lower base portion 13KD. The extension direction of the elastic deformation portions 13E is along the optical axis direction.

[0061] A fixed portion 13F is provided on an extension line of the elastic deformation portion 13E. Then, as shown in FIG. 6, the fixed portion 13F is clamped by a clamping portion 2C provided on the base member 2. Specifically, a groove portion 2G into which the fixed portion 13F is fitted is provided in the clamping portion 2C. In the illustrated example, the fixed portion 13F of the biasing member 13 is fitted from above into the groove portion 2G of the clamping portion 2C, and is thereby clamped by the clamping portion 2C. Note that clamping of the fixed portion 13F by the clamping portion 2C may be achieved by an adhesive, or may be reinforced by an adhesive.

[0062] Next, the position detection mechanism DT will be described with reference to Figure 7. Figure 7 is a rear view of the structure housed in a housing HS composed of a cover member 1 and a base member 2. The structure housed in the housing HS includes the position detection mechanism DT, lens body LS, piezoelectric driver PD, lens holder 3, substrate 4, and biasing member 13. For clarity, the substrate 4 is not shown in Figure 7, and a coarse dot pattern is applied to the first lens holder 3A and a fine dot pattern is applied to the second lens holder 3B.

[0063] The position detection mechanism DT is a mechanism for detecting the position of the lens holder 3, and includes a magnetic sensor 6 and a magnetic field generating member MG. The magnetic field generating member MG includes a magnet 11 and a magnetic member 12.

[0064] The magnetic sensor 6 is configured to detect the magnetic field generated by the magnetic field generating member MG. In the illustrated example, the magnetic sensor 6 is made up of a giant magnetoresistive effect (GMR) element, and is configured to measure a voltage value that changes depending on the magnitude of the magnetic field generated by the magnetic field generating member MG that the magnetic sensor 6 receives, thereby detecting the position of the lens holder 3 to which the magnetic field generating member MG is attached. The magnetic sensor 6 is configured to output a larger voltage value as the north pole portion approaches, and a smaller voltage value as the south pole portion approaches. However, the magnetic sensor 6 may also be configured to output a smaller voltage value as the north pole portion approaches, and a larger voltage value as the south pole portion approaches. In addition, the magnetic sensor 6 may be configured to detect the position of the lens holder 3 using other magnetic resistance elements such as a semiconductor magnetoresistive (SMR) element, an anisotropic magnetoresistive (AMR) element, or a tunnel magnetoresistive (TMR) element, or may be configured to detect the position of the lens holder 3 using a Hall element or the like.

[0065] In the illustrated example, the position detection mechanism DT includes a first position detection mechanism DT1 that detects the position of the first lens holder 3A and a second position detection mechanism DT2 that detects the position of the second lens holder 3B. The first position detection mechanism DT1 includes a first magnetic sensor 6A and a first magnetic field generation member MG1, and the second position detection mechanism DT2 includes a second magnetic sensor 6B and a second magnetic field generation member MG2. The first magnetic field generation member MG1 includes a first magnet 11A and a first magnetic member 12A, and the second magnetic field generation member MG2 includes a second magnet 11B and a second magnetic member 12B. The first magnetic member 12A includes a first left magnetic member 12AL and a first right magnetic member 12AR, and the second magnetic member 12B includes a second left magnetic member 12BL and a second right magnetic member 12BR.

[0066] The magnetic field generating member MG will now be described in detail with reference to FIGS. 8A to 8D. FIG. 8A is a top perspective view of the magnetic field generating member MG before the magnetic member 12 is attached to the magnet 11. FIG. 8B is a bottom perspective view of the magnetic field generating member MG after the magnetic member 12 is attached to the magnet 11. FIGS. 8C and 8D show the positional relationship between the magnetic sensor 6 and the magnetic field generating member MG that changes in response to movement of the lens holder 3 in the optical axis direction. Specifically, FIG. 8C is a right side view of the magnetic sensor 6 and the magnetic field generating member MG, and FIG. 8D is a bottom view of the magnetic sensor 6 and the magnetic field generating member MG. FIGS. 8A to 8D relate to the second magnetic field generating member MG2 attached to the bottom surface of the second right bearing portion 32BR of the second lens holder 3B. In the illustrated example, the second magnetic field generating member MG2 is fixed to the bottom surface of the second right bearing portion 32BR of the second lens holder 3B with an adhesive. However, the following description with reference to FIGS. 8A to 8D also applies to the first magnetic field generating member MG1 attached to the lower surface of the first left bearing portion 32AL of the first lens holder 3A.

[0067] As shown in FIG. 8A, the second magnetic field generating member MG2 includes a second magnet 11B, a second left magnetic member 12BL, and a second right magnetic member 12BR.

[0068] The second magnet 11B is a permanent magnet that is bipolarly magnetized in the Y-axis direction, which is a direction perpendicular to the optical axis direction. In the illustrated example, the second magnet 11B is magnetized so that one end (left end) in the direction perpendicular to the optical axis direction (Y-axis direction) is an N-pole and the other end (right end) is an S-pole. In FIG. 8A, for clarity, a fine cross pattern is applied to the N-pole portion of the second magnet 11B, and a coarse cross pattern is applied to the S-pole portion of the second magnet 11B.

[0069] 8B, the second left magnetic member 12BL and the second right magnetic member 12BR are both connected to the second magnet 11B. In the illustrated example, the second left magnetic member 12BL and the second right magnetic member 12BR are fixed to the second magnet 11B with an adhesive.

[0070] Specifically, the second left magnetic member 12BL is connected to the north pole portion, which is one end (left end) of the second magnet 11B, and is magnetized to the north pole, while the second right magnetic member 12BR is connected to the south pole portion, which is the other end (right end) of the second magnet 11B, and is magnetized to the south pole. Therefore, in FIG. 8B, the second left magnetic member 12BL has a fine cross pattern similar to the north pole portion of the second magnet 11B, and the second right magnetic member 12BR has a coarse cross pattern similar to the south pole portion of the second magnet 11B. The same is true for FIGS. 8C and 8D. However, in the state shown in FIG. 8A, neither the second left magnetic member 12BL nor the second right magnetic member 12BR is connected to the second magnet 11B and is not magnetized, and therefore no cross pattern is applied to the second left magnetic member 12BL or the second right magnetic member 12BR.

[0071] 8A, the second magnetic member 12B is configured to have a rod-shaped portion BP and an L-shaped protrusion PR that protrudes downward (in the Z2 direction) from the rod-shaped portion BP and then protrudes inward. Specifically, the second left magnetic member 12BL has a left rod-shaped portion BPL and three protrusions PR (first left protrusion PR1L to third left protrusion PR3L) that protrude downward from the left rod-shaped portion BPL and then protrude toward the second magnet 11B (in the Y2 direction). The second right magnetic member 12BR has a right rod-shaped portion BPR and three protrusions PR (first right protrusion PR1R to third right protrusion PR3R) that protrude downward from the right rod-shaped portion BPR and then protrude toward the second magnet 11B (in the Y1 direction).

[0072] In the illustrated example, the second left magnetic member 12BL is configured so that the height, which is the dimension of the left bar-shaped member BPL in the Z-axis direction, is the same as the height of the second magnet 11B. However, the height of the left bar-shaped member BPL may be configured so that it is greater than the height of the second magnet 11B. In this case, the second left magnetic member 12BL may be connected to the second magnet 11B so that the upper end surface of the left bar-shaped member BPL coincides with the upper end surface of the second magnet 11B. The three protrusions PR may be configured to protrude toward the second magnet 11B (in the Y2 direction) from a portion of the left bar-shaped member BPL that protrudes downward (in the Z2 direction) from the lower end surface of the second magnet 11B. The same applies to the second right magnetic member 12BR. Alternatively, the second left magnetic member 12BL having such a shape may be connected to the second magnet 11B so that the upper end surface of the left bar-shaped member BPL contacts the lower end surface of the second magnet 11B. In this case, the width, which is the dimension in the Y-axis direction, of the second magnet 11B may be larger. The same applies to the second right magnetic member 12BR.

[0073] In addition, in the illustrated example, the second left magnetic member 12BL and the second right magnetic member 12BR are configured so that the first left protrusion PR1L to the third left protrusion PR3L and the first right protrusion PR1R to the third right protrusion PR3R are arranged alternately in the extension direction (X-axis direction) of the second magnetic field generating member MG2.

[0074] Specifically, as shown in FIG. 8B, the second left magnetic member 12BL and the second right magnetic member 12BR are configured such that the first right protrusion PR1R is arranged at the frontmost side (X1 side) in the extension direction (X-axis direction) of the second magnetic field generating member MG2, the first left protrusion PR1L is arranged behind it (X2 side), the second right protrusion PR2R is arranged further behind it (X2 side), the second left protrusion PR2L is arranged further behind it (X2 side), the third right protrusion PR3R is arranged further behind it (X2 side), and the third left protrusion PR3L is arranged further behind it (X2 side).

[0075] Also, as shown in Figure 8A, the second left magnetic member 12BL and the second right magnetic member 12BR are configured so that the width M1 of the first left protrusion PR1L, the width M2 of the second left protrusion PR2L, the width M3 of the third left protrusion PR3L, the width M4 of the first right protrusion PR1R, the width M5 of the second right protrusion PR2R, and the width M6 of the third right protrusion PR3R in the extension direction (X-axis direction) of the second magnetic field generating member MG2 are all the same.

[0076] Also, as shown in Figure 8A, the second left magnetic member 12BL and the second right magnetic member 12BR are configured so that the distance L1 between the first left protrusion PR1L and the second left protrusion PR2L in the extension direction (X-axis direction) of the second magnetic field generating member MG2, the distance L2 between the second left protrusion PR2L and the third left protrusion PR3L, the distance L3 between the first right protrusion PR1R and the second right protrusion PR2R, and the distance L4 between the second right protrusion PR2R and the third right protrusion PR3R are all the same.

[0077] Also, as shown in Figure 8B, the second left magnetic member 12BL and the second right magnetic member 12BR are configured so that the distance N1 between the first right protrusion PR1R and the first left protrusion PR1L in the extension direction (X-axis direction) of the second magnetic field generating member MG2, the distance N2 between the first left protrusion PR1L and the second right protrusion PR2R, the distance N3 between the second right protrusion PR2R and the second left protrusion PR2L, the distance N4 between the second left protrusion PR2L and the third right protrusion PR3R, and the distance N5 between the third right protrusion PR3R and the third left protrusion PR3L are all the same.

[0078] Furthermore, as shown in FIG. 8C, the second left magnetic member 12BL and the second right magnetic member 12BR are configured so that the thicknesses TK of the portions of the first left protrusion PR1L to the third left protrusion PR3L and the first right protrusion PR1R to the third right protrusion PR3R that protrude toward the second magnet 11B are all the same.

[0079] Furthermore, as shown in Figure 8C, the second left magnetic member 12BL and the second right magnetic member 12BR are configured so that the distance GP between the lower (Z2 side) end faces of each of the first left protrusion PR1L to the third left protrusion PR3L and the first right protrusion PR1R to the third right protrusion PR3R and the magnetic sensor 6 (second magnetic sensor 6B) fixed to the substrate 4 (not shown) is the same.

[0080] However, the second left magnetic member 12BL and the second right magnetic member 12BR may be configured so that the widths M1 to M6 are different from one another. The same applies to the intervals L1 to L4, and the same applies to the intervals N1 to N5. Furthermore, the second left magnetic member 12BL and the second right magnetic member 12BR may be configured so that the thicknesses TK of the portions of the first left protrusion PR1L to third left protrusion PR3L and the first right protrusion PR1R to third right protrusion PR3R that protrude toward the second magnet 11B are different from one another. The same applies to the interval GP.

[0081] The center diagrams of Figures 8C and 8D show the positional relationship between the second magnetic field generator MG2 and the second magnetic sensor 6B when the second lens holder 3B is located at the reference position shown in Figure 1B. The top diagram of Figure 8C and the left diagram of Figure 8D show the positional relationship between the second magnetic field generator MG2 and the second magnetic sensor 6B when the second lens holder 3B moves backward (in the X2 direction) from the reference position. The bottom diagram of Figure 8C and the right diagram of Figure 8D show the positional relationship between the second magnetic field generator MG2 and the second magnetic sensor 6B when the second lens holder 3B moves forward (in the X1 direction) from the reference position.

[0082] The second magnetic sensor 6B is provided on a substrate 4 fixed to the base member 2 so as to detect the magnetic fields generated by the first left protrusion PR1L to the third left protrusion PR3L and the first right protrusion PR1R to the third right protrusion PR3R.

[0083] When the second lens holder 3B is positioned at the reference position, the second magnetic sensor 6B partially faces the second right protrusion PR2R of the second right magnetic member 12BR, which is the S-pole portion, as shown in the central diagram of Figure 8C and the central diagram of Figure 8D.

[0084] Then, when the second lens holder 3B moves backward (in the X2 direction) from the reference position, the second magnetic sensor 6B moves away from the second right protrusion PR2R of the second right magnetic member 12BR, which is the S-pole portion, and comes partially opposite the first left protrusion PR1L of the second left magnetic member 12BL, which is the N-pole portion, as shown in the upper diagram of Figure 8C and the left diagram of Figure 8D.

[0085] Furthermore, when the second lens holder 3B moves forward (in the X1 direction) from the reference position, the second magnetic sensor 6B moves away from the second right protrusion PR2R of the second right magnetic member 12BR, which is the S-pole portion, and comes partially opposite the second left protrusion PR2L of the second left magnetic member 12BL, which is the N-pole portion, as shown in the lower diagram of Figure 8C and the right diagram of Figure 8D.

[0086] By utilizing the above-described position detection mechanism DT, a control device (not shown) connected to the second magnetic sensor 6B via the conductive pattern formed on the substrate 4 can detect the position of the second lens holder 3B based on the voltage value output by the second magnetic sensor 6B. In the illustrated example, the control device is provided outside the housing HS, but it may also be provided inside the housing HS.

[0087] In the illustrated example, the magnetic field generating member MG is composed of one bipolar permanent magnet, but it may also be composed of a combination of multiple bipolar permanent magnets, one multipolar permanent magnet, or a combination of multiple multipolar permanent magnets.

[0088] Next, the movement of the lens holder 3 will be described with reference to FIG. 9. FIG. 9 is a perspective view of the lens holder 3, shaft member 5, receiving member 7, lens body LS, and magnetic field generating member MG. Specifically, the upper part of FIG. 9 shows the positional relationship of each component (lens holder 3, shaft member 5, receiving member 7, lens body LS, and magnetic field generating member MG) when the first lens holder 3A moves to the frontmost side (X1 side) and the second lens holder 3B moves to the rearmost side (X2 side). The middle part of FIG. 9 shows the positional relationship of each component when the first lens holder 3A moves to the frontmost side (X1 side) and the second lens holder 3B moves to the frontmost side (X1 side). The lower part of FIG. 9 shows the positional relationship of each component when the second lens holder 3B moves to the rearmost side (X2 side) and the first lens holder 3A moves to the rearmost side (X2 side).

[0089] As shown in FIG. 9, the lens holder driving device 101 can move the first lens holder 3A and the second lens holder 3B separately along the optical axis direction.

[0090] Next, the lens holder 3 will be described in detail with reference to Fig. 10. Fig. 10 is a perspective view of the bottom surface of the lens holder 3. The description with reference to Fig. 10 relates to the second lens holder 3B, but is similarly applicable to the first lens holder 3A.

[0091] As described above, the second lens holder 3B includes the second holding portion 31B, the second left bearing portion 32BL, and the second right bearing portion 32BR.

[0092] The second holding portion 31B has a circular through hole RH through which the optical axis OA passes. The circular through hole RH includes a front circular through hole RHF and a rear circular through hole RHB. In the illustrated example, the front circular through hole RHF is configured by a combination of a U-shaped groove portion DCF that opens upward (in the Z1 direction) and a U-shaped groove portion UCF that opens downward (in the Z2 direction). Specifically, the U-shaped groove portion DCF and the U-shaped groove portion UCF are arranged so as to be adjacent to each other in the front-rear direction (in the X-axis direction) and to face opposite each other in the up-down direction. Similarly, the rear circular through hole RHB is configured by a combination of a U-shaped groove portion DCB that opens upward (in the Z1 direction) and a U-shaped groove portion UCB that opens downward (in the Z2 direction). Specifically, the U-shaped groove portion DCB and the U-shaped groove portion UCB are arranged so as to be adjacent to each other in the front-rear direction (in the X-axis direction) and to face opposite each other in the up-down direction.

[0093] The second right bearing portion 32BR has a round through-hole TH through which the second shaft member 5B passes. The round through-hole TH includes a front round through-hole THF and a rear round through-hole THB. In the illustrated example, the front round through-hole THF is configured by a combination of a U-shaped groove portion DRF that opens upward (in the Z1 direction) and a U-shaped groove portion URF that opens downward (in the Z2 direction). Specifically, the U-shaped groove portions DRF and URF are arranged adjacent to each other in the front-rear direction (in the X-axis direction) and facing opposite directions in the up-down direction. Similarly, the rear round through-hole THB is configured by a combination of a U-shaped groove portion DRB that opens upward (in the Z1 direction) and a U-shaped groove portion URB that opens downward (in the Z2 direction). Specifically, the U-shaped groove portions DRB and URB are arranged adjacent to each other in the front-rear direction (in the X-axis direction) and facing opposite directions in the up-down direction.

[0094] The second left bearing portion 32BL also has a notch CT through which the first shaft member 5A passes. In the illustrated example, the notch CT is configured by a combination of an upper L-shaped groove portion UL that opens downward (in the Z2 direction) and leftward (in the Y1 direction) and a lower L-shaped groove portion DL that opens upward (in the Z1 direction) and leftward (in the Y1 direction). Specifically, the upper L-shaped groove portion UL and the lower L-shaped groove portion DL are arranged adjacent to each other in the front-to-rear direction (the X-axis direction) and facing opposite directions in the up-down direction.

[0095] In this way, since the through hole TH is formed by a pair of U-shaped grooves and the notch CT is formed by a pair of L-shaped grooves, the second lens holder 3B can be manufactured by injection molding using a pair of molds that are separated in the vertical direction and do not include a slide core, which has the effect of reducing manufacturing costs.

[0096] As described above, as shown in FIG. 3 , the lens holder driving device 101 according to the embodiment of the present invention includes a fixed member FB (base member 2), a lens holder 3 capable of holding a lens body LS, a shaft member 5 attached to the fixed member FB (base member 2) and extending along the optical axis direction so as to guide the lens holder 3, and a piezoelectric driving unit PD having a piezoelectric element 8 extending in a direction intersecting the optical axis direction and moving the lens holder 3 along the optical axis direction by the movement (circular motion) of the piezoelectric element 8. The piezoelectric driving unit PD is provided on the fixed member FB (base member 2). The lens holder 3 is provided with a receiving member 7 that faces the piezoelectric driving unit PD so as to be in contact with the piezoelectric driving unit PD, extends in a direction intersecting the extension direction of the piezoelectric element 8, and receives the movement of the piezoelectric element 8. The piezoelectric driving unit PD has a contact member 9 on the surface of the piezoelectric element 8 facing the lens holder 3, and is biased toward the receiving member 7 by a biasing member 13 provided on the fixed member FB (base member 2) so that the receiving member 7 and the contact member 9 come into contact. In the above embodiment, the lens holder driving device 101 is configured to be able to separately move two lens holders 3 (first lens holder 3A and second lens holder 3B) in the optical axis direction. However, the lens holder driving device 101 may have only one lens holder 3 and be configured to be able to move that one lens holder 3 in the optical axis direction, or may be configured to be able to separately move three or more lens holders 3 in the optical axis direction.

[0097] This configuration can improve the ease of assembly of the lens holder driving device 101. In other words, this configuration brings about the effect of being able to provide a lens holder driving device 101 that is easy to assemble. This is because the piezoelectric driving unit PD is provided on the fixed-side member FB (base member 2), that is, because power can be supplied to the piezoelectric driving unit PD without using a member such as a flexible substrate that deforms in response to the movement of the lens holder 3. In addition, this configuration brings about the effect that the movement of the lens holder 3 is not restricted by a member such as a flexible substrate that deforms in response to the movement of the lens holder 3.

[0098] In the above-described embodiment, the lens holder 3 may have a holding portion 31 that holds the lens body LS and a bearing portion 32 that receives the shaft member 5, as shown in FIGS. 4A and 4B. In this case, the receiving member 7 may be made of a separate material from the lens holder 3. In the example shown in FIGS. 4A and 4B, the receiving member 7 is made of metal, and the lens holder 3 is made of synthetic resin. The receiving member 7 is fixed to the bearing portion 32. The receiving member 7 is longer than the holding portion 31 in the optical axis direction, and the bearing portion 32 to which the receiving member 7 is fixed is also longer than the holding portion 31 in the optical axis direction. The width of the receiving member 7 in the optical axis direction is greater than the width of the movable range of the lens holder 3 in the optical axis direction. In the example shown in FIG. 4A, the first lens holder 3A has a first holding portion 31A that holds the first lens body LS1, a first left bearing portion 32AL that receives the first shaft member 5A, and a first right bearing portion 32AR that receives the second shaft member 5B. The second lens holder 3B has a second holding portion 31B that holds the second lens body LS2, a second left bearing portion 32BL that receives the first shaft member 5A, and a second right bearing portion 32BR that receives the second shaft member 5B. The first receiving member 7A is longer than the first holding portion 31A in the optical axis direction, and the first left bearing portion 32AL to which the first receiving member 7A is fixed is also longer than the first holding portion 31A in the optical axis direction. Similarly, the second receiving member 7B is longer than the second holding portion 31B in the optical axis direction, and the second right bearing portion 32BR to which the second receiving member 7B is fixed is also longer than the second holding portion 31B in the optical axis direction. The width W3 of the first receiving member 7A in the optical axis direction is greater than the width of the movable range of the first lens holder 3A in the optical axis direction, and the width W7 of the second receiving member 7B in the optical axis direction is greater than the width of the movable range of the second lens holder 3B in the optical axis direction.

[0099] This configuration brings about the effect that the width of the movable range of the first lens holder 3A in the optical axis direction can be made larger than at least the width of the first holding portion 31A in the optical axis direction.

[0100] In the above-described embodiment, the shaft member 5 includes a first shaft member 5A and a second shaft member 5B. The support member 7 is located away from the imaginary plane VP, as shown in FIG. 7 . Specifically, the first support member 7A has its axis 7AX located off the imaginary plane VP, and the second support member 7B has its axis 7BX located off the imaginary plane VP. In this embodiment, the axes 7AX and 7BX are configured to be parallel to the imaginary plane VP. The imaginary plane VP is an imaginary plane that includes the axis 5AX of the first shaft member 5A and the axis 5BX of the second shaft member 5B, which are parallel to each other. In the example shown in FIG. 7 , the first movable body, including the first lens holder 3A, the first support member 7A, and the first magnetic field generating member MG1, is configured so that its center of gravity is located on the imaginary plane VP. This is to suppress the generation of torque around the center of gravity when the first movable body moves along the shaft member 5. The same applies to the second movable body including the second lens holder 3B, the second receiving member 7B, and the second magnetic field generating member MG2. Specifically, the base member 2 serving as the fixed-side member FB has a bottom surface portion 2B as shown in FIG. 3. The lens holder 3 is open at the top as shown in FIG. 4B, so that it can house (accept) the lens body LS. The receiving member 7 is provided at a position offset above (toward Z1) the imaginary plane VP as shown in FIG. 7. The receiving member 7 may also be provided at a position offset below (toward Z2) the imaginary plane VP.

[0101] This configuration has the effect of suppressing rattle of the lens holder 3. In the example shown in FIG. 7, the force (biasing force F1 indicated by the dotted arrow) with which the second biasing member 13B biases the second receiving member 7B attached to the second lens holder 3B toward the Y1 side generates a torque (biasing torque TQ indicated by the dashed-dotted arrow) that tends to rotate the second lens holder 3B around the axis line (axis 5BX) of the second shaft member 5B. The biasing torque TQ acts to press the second left bearing portion 32BL of the second lens holder 3B from above against the first shaft member 5A. In addition to the biasing torque TQ, a torque (weight torque) that tends to rotate the second lens holder 3B around the axis line (axis 5BX) of the second shaft member 5B acts on the second lens holder 3B due to the weight of the second lens holder 3B. The second biasing member 13B is configured so that the magnitude of the biasing torque TQ provided by the biasing force F1 is greater than the magnitude of the weight torque. Therefore, no matter what position the lens holder driving device 101 is in (even if it is upside down), the resultant torque obtained by combining the biasing torque TQ and the weight torque always acts to press the second left bearing portion 32BL of the second lens holder 3B against the first shaft member 5A. In other words, not only when the biasing torque TQ and the weight torque are in the same direction, but also when the biasing torque TQ and the weight torque are in opposite directions, the resultant torque always acts to press the second left bearing portion 32BL of the second lens holder 3B against the first shaft member 5A. As a result, no matter what position the lens holder driving device 101 is in (even if it is upside down), the second left bearing portion 32BL of the second lens holder 3B and the first shaft member 5A are always in contact with each other, and the occurrence of rattle between the second left bearing portion 32BL and the first shaft member 5A is suppressed. The same applies to rattle between the second right bearing portion 32BR of the second lens holder 3B and the second shaft member 5B, the rattle between the first right bearing portion 32AR of the first lens holder 3A and the second shaft member 5B, and the rattle between the first left bearing portion 32AL of the first lens holder 3A and the first shaft member 5A.

[0102] This configuration also has the effect of facilitating attachment of the lens body LS to the lens holder 3. Attachment of the lens body LS to the lens holder 3 is typically performed with the lower member LM (excluding the lens body LS) placed on a workbench in the orientation shown in FIG. 1B . In this state, the first left bearing portion 32AL of the first lens holder 3A is pressed against the first shaft member 5A, and the first right bearing portion 32AR of the first lens holder 3A is pressed against the second shaft member 5B from above. The second right bearing portion 32BR of the second lens holder 3B is pressed against the second shaft member 5B, and the second left bearing portion 32BL of the second lens holder 3B is pressed against the first shaft member 5A from above. In other words, the position of the lens holder 3 does not change before and after attachment of the lens body LS to the lens holder 3.

[0103] In the above-described embodiment, the receiving member 7 and the contact member 9 are both made of metal.

[0104] This configuration has the advantage that the receiving member 7 and the contact member 9 are less susceptible to wear than when at least one of the receiving member 7 and the contact member 9 is made of synthetic resin. Furthermore, this configuration has the advantage that the contact member 9 is softer (more easily bendable) than the receiving member 7, and therefore the bending vibration (circular motion) of the piezoelectric element 8 is prevented from being excessively hindered.

[0105] In the above-described embodiment, the biasing member 13 is configured by a leaf spring member extending in the optical axis direction. Specifically, as shown in Fig. 5B, the biasing member 13 has a pair of fixed portions 13F fixed to the base member 2 serving as the fixed-side member FB, a support portion 13S supporting the piezoelectric driver PD, and a pair of elastically deformable elastic deformation portions 13E provided between each of the pair of fixed portions 13F and the support portion 13S.

[0106] This configuration has the advantage of being able to relax the dimensional tolerance of the biasing member 13 compared to a configuration using a leaf spring member extending in a direction perpendicular to the optical axis direction (Z-axis direction). This is because the housing HS is configured so that the dimension in the optical axis direction (X-axis direction) is greater than the dimension (height) in the Z-axis direction. That is, this configuration allows the dimension of the elastic deformation portion 13E in the optical axis direction (the distance between the fixed portion 13F and the support portion 13S) to be larger compared to a configuration using a leaf spring member extending in a direction perpendicular to the optical axis direction (Z-axis direction). Furthermore, the larger the dimension of the elastic deformation portion 13E, the smaller the effect that deviation of the elastic deformation portion 13E from the reference dimension has on the spring constant of the elastic deformation portion 13E.

[0107] In the above-described embodiment, the lens holder 3 has a plurality of through holes, as shown in FIG. 10 . The plurality of through holes includes a round through hole RH through which the optical axis OA passes and a round through hole TH through which the shaft member 5 is inserted. The round through hole RH includes a front round through hole RHF and a rear round through hole RHB, and the round through hole TH includes a front round through hole THF and a rear round through hole THB. Each of the plurality of through holes is formed by a combination of a first groove portion that opens upward and a second groove portion that opens downward. Specifically, the front round through hole RHF is formed by a combination of a U-shaped groove portion DCF that opens upward (in the Z1 direction) and a U-shaped groove portion UCF that opens downward (in the Z2 direction), and the rear round through hole RHB is formed by a combination of a U-shaped groove portion DCB that opens upward (in the Z1 direction) and a U-shaped groove portion UCB that opens downward (in the Z2 direction). The front round through-hole THF is formed by a combination of a U-shaped groove portion DRF that opens upward (in the Z1 direction) and a U-shaped groove portion URF that opens downward (in the Z2 direction), and the rear round through-hole THB is formed by a combination of a U-shaped groove portion DRB that opens upward (in the Z1 direction) and a U-shaped groove portion URB that opens downward (in the Z2 direction). That is, in the above-described embodiment, the lens holder 3 is manufactured by injection molding using a pair of molds that are separated in the vertical direction (in the Z-axis direction) and do not include a slide core.

[0108] Therefore, this configuration has the advantage of being able to reduce manufacturing costs compared to manufacturing by injection molding using a mold that includes a slide core, because it is possible to suppress, for example, a decrease in yield or a decrease in manufacturing efficiency due to defects in the mold.

[0109] In the above-described embodiment, the lens holder 3 is provided with a magnetic field generating member MG extending in the optical axis direction, as shown in FIG. 3. As shown in FIG. 8A, the magnetic field generating member MG includes a magnet 11 (second magnet 11B) that is magnetized so that one end (the end on the Y1 side (left end)) in a first direction (the Y axis direction) perpendicular to the optical axis direction is an N pole and the other end (the end on the Y2 side (right end)) is an S pole, a one-end magnetic member (second left magnetic member 12BL) fixed to the one end, and an other-end magnetic member (second right magnetic member 12BR) fixed to the other end. The one-end magnetic member (second left magnetic member 12BL) has a plurality of first protrusions (first left protrusion PR1L to third left protrusion PR3L) that protrude toward the other end, and the other-end magnetic member (second right magnetic member 12BR) has a plurality of second protrusions (first right protrusion PR1R to third right protrusion PR3R) that protrude toward the one end. The first protrusions (first left protrusion PR1L to third left protrusion PR3L) and the second protrusions (first right protrusion PR1R to third right protrusion PR3R) protrude in opposite directions and are alternately arranged in the extension direction (X-axis direction) of the magnetic field generating member MG. In the illustrated example, the one-end magnetic member (second left magnetic member 12BL) has a plurality of first protrusions (first left protrusion PR1L to third left protrusion PR3L) protruding in a second direction (Z-axis direction) perpendicular to the optical axis direction and perpendicular to the first direction (Y-axis direction), and the other-end magnetic member (second right magnetic member 12BR) has a plurality of second protrusions (first right protrusion PR1R to third right protrusion PR3R) protruding in the second direction (Z-axis direction). The first protrusions (first left protrusion PR1L to third left protrusion PR3L) and the second protrusions (first right protrusion PR1R to third right protrusion PR3R) protrude in opposite directions and are arranged alternately in the extension direction (X-axis direction) of the magnetic field generating member MG. The base member 2 (substrate 4) serving as the fixed-side member FB is provided with a magnetic sensor 6 that detects the magnetic fields generated by the first protrusions (first left protrusion PR1L to third left protrusion PR3L) and the second protrusions (first right protrusion PR1R to third right protrusion PR3R).

[0110] This configuration has the effect of reducing the manufacturing cost of the lens holder driving device 101. This is because the movement of the lens holder 3 in the optical axis direction can be detected by using the magnetic field generating member MG, which is configured by combining the two-pole magnetized magnet 11 and the magnetic member 12, without using a multi-pole magnetized permanent magnet.

[0111] In the above-described embodiment, the lens body LS includes a first lens body LS1 and a second lens body LS2 that share a common optical axis OA, as shown in FIG. 1B. As shown in FIG. 3, the lens holder 3 includes a first lens holder 3A that holds the first lens body LS1 and a second lens holder 3B that holds the second lens body LS2, and the shaft member 5 includes a first shaft member 5A and a second shaft member 5B. The piezoelectric driver PD includes a first piezoelectric element 8A extending in a direction intersecting the optical axis direction (the Z-axis direction) and moves the first lens holder 3A along the optical axis direction by the movement (circular motion) of the first piezoelectric element 8A. The piezoelectric driver PD also includes a second piezoelectric element 8B extending in a direction intersecting the optical axis direction (the Z-axis direction) and moves the second lens holder 3B along the optical axis direction by the movement (circular motion) of the second piezoelectric element 8B. The first lens holder 3A and the second lens holder 3B are disposed opposite each other in the optical axis direction. The first piezoelectric drive unit PD1 and the second piezoelectric drive unit PD2 are both provided on a base member 2 serving as a fixed-side member FB. The first piezoelectric drive unit PD1 and the second piezoelectric drive unit PD2 are disposed spaced apart from each other with the first shaft member 5A and the second shaft member 5B sandwiched therebetween. Specifically, as shown in FIG. 3, the first lens holder 3A is provided with a first bearing member 7A that faces the first piezoelectric drive unit PD1 so as to be in contact with the first piezoelectric drive unit PD1, extends in the X-axis direction, which is a direction intersecting the extension direction (Z-axis direction) of the first piezoelectric element 8A, and receives the movement of the first piezoelectric element 8A. As shown in FIG. 4A, the first lens holder 3A has a portion close to the first shaft member 5A (first left bearing portion 32AL) and a portion close to the second shaft member 5B (first right bearing portion 32AR). The first receiving member 7A is attached to the first lens holder 3A at a portion (first left bearing portion 32AL) of the first lens holder 3A that is close to the first shaft member 5A. Similarly, the second lens holder 3B is provided with a second receiving member 7B that faces the second piezoelectric driving unit PD2 so as to come into contact with the second piezoelectric driving unit PD2, extends in the X-axis direction that intersects with the extension direction (Z-axis direction) of the second piezoelectric element 8B, and receives the movement of the second piezoelectric element 8B, as shown in FIG.4A, the second lens holder 3B has a portion (second left bearing portion 32BL) close to the first shaft member 5A and a portion (second right bearing portion 32BR) close to the second shaft member 5B. The second receiving member 7B is attached to the second lens holder 3B at the portion (second right bearing portion 32BR) of the second lens holder 3B close to the second shaft member 5B. The first piezoelectric driving unit PD1 has a first contact member 9A on the surface of the first piezoelectric element 8A facing the first lens holder 3A (Y2 side), and is biased toward the first receiving member 7A (Y2 side) by a first biasing member 13A provided on the base member 2 serving as the fixed-side member FB so that the first receiving member 7A and the first contact member 9A come into contact with each other. Similarly, the second piezoelectric driving unit PD2 has a second contact member 9B on the surface of the second piezoelectric element 8B facing the second lens holder 3B (Y1 side), and is biased toward the second receiving member 7B (Y1 side) by a second biasing member 13B provided on the base member 2 as the fixed side member FB so that the second receiving member 7B and the second contact member 9B come into contact.

[0112] This configuration can improve the assembly ease of the lens holder driving device 101. That is, this configuration provides the effect of providing an easy-to-assemble lens holder driving device 101. This is because the first piezoelectric driving unit PD1 is provided on the fixed-side member FB (base member 2), and power can be supplied to the first piezoelectric driving unit PD1 without using a member such as a flexible substrate that deforms in response to the movement of the first lens holder 3A. Similarly, this is because the second piezoelectric driving unit PD2 is provided on the fixed-side member FB (base member 2), and power can be supplied to the second piezoelectric driving unit PD2 without using a member such as a flexible substrate that deforms in response to the movement of the second lens holder 3B. This configuration also provides the effect that the movement of the first lens holder 3A is not restricted by a member such as a flexible substrate that deforms in response to the movement of the first lens holder 3A, and the effect that the movement of the second lens holder 3B is not restricted by a member such as a flexible substrate that deforms in response to the movement of the second lens holder 3B.

[0113] Furthermore, this configuration brings about the effect of improving ease of assembly, since the first piezoelectric drive unit PD1 and the second piezoelectric drive unit PD2 are arranged at positions separated from each other on the fixed-side member FB (base member 2).

[0114] In the above-described embodiment, as shown in FIG. 4A, the first lens holder 3A has a first holding portion 31A that holds the first lens body LS1. The first receiving member 7A is formed to be longer than the first holding portion 31A in the optical axis direction. Similarly, as shown in FIG. 4A, the second lens holder 3B has a second holding portion 31B that holds the second lens body LS2. The second receiving member 7B is formed to be longer than the second holding portion 31B in the optical axis direction. When the first holding portion 31A and the second holding portion 31B are close to each other, at least a portion of the first receiving member 7A and at least a portion of the second receiving member 7B overlap in the optical axis direction. In the state shown in FIG. 4A, the first receiving member 7A and the second receiving member 7B overlap over a width W9 in the optical axis direction.

[0115] This configuration has the effect of increasing the amount of movement of each of the first lens holder 3A and the second lens holder 3B in the optical axis direction within the limited length of the shaft member 5. This is because the first lens body LS1 and the second lens body LS2 can be brought close to each other to the extent that they substantially come into contact with each other, even while ensuring that the width W1 of the first left bearing portion 32AL is greater than the width W2 of the first holding portion 31A and the width W5 of the second right bearing portion 32BR is greater than the width W6 of the second holding portion 31B.

[0116] Both the first receiving member 7A and the second receiving member 7B may be provided at a position away from an imaginary plane VP including the axis of the first shaft member 5A and the axis of the second shaft member 5B, as shown in FIG.

[0117] This configuration has the effect of suppressing rattle of each of the first lens holder 3A and the second lens holder 3B. This is because a configuration can be realized in which, no matter what position the lens holder driving device 101 is in (even if it is upside down), the torque acting on the first lens holder 3A always acts to press the first lens holder 3A against the shaft member 5, and the torque acting on the second lens holder 3B always acts to press the second lens holder 3B against the shaft member 5.

[0118] In the above-described embodiment, the base member 2 serving as the fixed-side member FB includes a bottom surface portion 2B, as shown in FIG. 3. The first lens holder 3A is open at the top, allowing the first lens body LS1 to be inserted thereinto. The first receiving member 7A is located above the imaginary plane VP (on the Z1 side), as shown in FIG. 7. Similarly, the second lens holder 3B is open at the top, allowing the second lens body LS2 to be inserted thereinto, as shown in FIG. 4B. The second receiving member 7B is located above the imaginary plane VP (on the Z1 side), as shown in FIG. 7.

[0119] This configuration has the effect of facilitating attachment of the first lens body LS1 to the first lens holder 3A. This is because, with this configuration, the first left bearing portion 32AL of the first lens holder 3A is pressed against the first shaft member 5A, and the first right bearing portion 32AR of the first lens holder 3A is pressed against the second shaft member 5B from above. In other words, this is because the configuration prevents rattling between the first lens holder 3A and the first shaft member 5A and the second shaft member 5B before and after attachment of the first lens body LS1 to the first lens holder 3A. The same applies to attachment of the second lens body LS2 to the second lens holder 3B.

[0120] In the above-described embodiment, the first biasing member 13A is formed of a leaf spring member. As shown in FIG. 5B , the first biasing member 13A has a pair of fixing portions 13F (first fixing portions) fixed to the base member 2 serving as the fixed-side member FB, a support portion 13S (first support portion) supporting the first piezoelectric driver PD1, and a pair of elastically deformable elastic deformation portions 13E (first elastic deformation portions) provided between each of the pair of fixing portions 13F and the support portion 13S. Similarly, the second biasing member 13B is formed of a leaf spring member. The second biasing member 13B has a pair of fixing portions 13F (second fixing portions) fixed to the base member 2 serving as the fixed-side member FB, a support portion 13S (second support portion) supporting the second piezoelectric driver PD2, and a pair of elastically deformable elastic deformation portions 13E (second elastic deformation portions) provided between each of the pair of fixing portions 13F and the support portion 13S.

[0121] This configuration has the advantage of being able to relax the dimensional tolerances of the first biasing member 13A and the second biasing member 13B compared to a configuration using leaf spring members extending in a direction perpendicular to the optical axis direction (Z-axis direction). This is because the housing HS is configured so that its dimension in the optical axis direction (X-axis direction) is greater than its dimension (height) in the Z-axis direction. That is, this configuration allows the dimension of the elastic deformation portion 13E in the optical axis direction (the distance between the fixed portion 13F and the support portion 13S) to be larger compared to a configuration using leaf spring members extending in a direction perpendicular to the optical axis direction (Z-axis direction). Furthermore, the larger the dimension of the elastic deformation portion 13E in the optical axis direction, the smaller the effect that deviation of the elastic deformation portion 13E from its reference dimension has on the spring constant of the elastic deformation portion 13E.

[0122] In the above-described embodiment, the first lens holder 3A is provided with a first magnetic field generating member MG1 extending in the optical axis direction on the first shaft member 5A side. The second lens holder 3B is provided with a second magnetic field generating member MG2 extending in the optical axis direction on the second shaft member 5B side. The base member 2 (substrate 4) serving as the fixed-side member FB is provided with a first magnetic sensor 6A that detects the magnetic field generated by the first magnetic field generating member MG1 and a second magnetic sensor 6B that detects the magnetic field generated by the second magnetic field generating member MG2.

[0123] This configuration has the advantage of suppressing magnetic interference between the first position detection mechanism DT1, which is composed of the first magnetic field generating member MG1 and the first magnetic sensor 6A, and the second position detection mechanism DT2, which is composed of the second magnetic field generating member MG2 and the second magnetic sensor 6B.

[0124] The preferred embodiments of the present invention have been described above in detail. However, the present invention is not limited to the above-described embodiments. Various modifications and substitutions may be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, the features described with reference to the above-described embodiments may be combined as appropriate unless technically inconsistent.

[0125] For example, in the above-described embodiment, the circular through-hole TH is configured by a combination of two U-shaped grooves, but at least one of the U-shaped grooves may be a V-shaped groove. The same applies to the circular through-hole RH. [Explanation of symbols]

[0126] REFERENCE SIGNS LIST 1 Cover member 2 Base member 2A Outer wall portion 2A1 First side plate portion 2A2 Second side plate portion 2A3 Third side plate portion 2A4 Fourth side plate portion 2B Bottom surface portion 2C Clamping portion 2G Groove portion 2P Plug member 2S Storage portion 2T Notch 3 Lens holder 3A First lens holder 3B Second lens holder 4 Circuit board 4T Terminal portion 5 Shaft member 5A First shaft member 5AX Shaft 5B Second shaft member 5BX Shaft 6 Magnetic sensor 6A First magnetic sensor 6B Second magnetic sensor 7 Receiving member DESCRIPTION OF SYMBOLS 7A First receiving member 7AX Shaft 7B Second receiving member 7BX Shaft 8 Piezoelectric element 8A First piezoelectric element 8AX Rotating shaft 8B Second piezoelectric element 9 Contact member 9A First contact member 9B Second contact member 10 Circuit board 10A First circuit board 10B Second circuit board 11 Magnet 11A First magnet 11B Second magnet 12 Magnetic member 12A First magnetic member 12AL First left magnetic member 12AR First right magnetic member 12B Second magnetic member 12BL Second left magnetic member 12BR Second right magnetic member 13 Biasing member 13A First biasing member 13B Second biasing member 13E Elastic deformation portion 13EB Rear elastic deformation portion 13EF Front elastic deformation portion 13F Fixed portion 13FB Rear fixed portion 13FF Front fixed portion 13K Base portion 13KD Lower base portion 13KU Upper base portion 13N Bending portion 13ND Lower bending portion 13NU Upper bending portion 13S Support portion 13SD Lower support portion 13SU Upper support portion 31 Holding portion 31A First holding portion 31B Second holding portion 32 Bearing portion 32A First bearing portion 32AL···First left bearing part 32AR···First right bearing part 32B···Second bearing part 32BL···Second left bearing part 32BR···Second right bearing part 32L···Left bearing part 32R···Right bearing part 101···Lens holder drive unit AB, AF···Contact part BE···Inner edge part BP···Rod-shaped part BPL···Left rod-shaped partBPR···Right rod-shaped part CL···Center line CM··Camera module CT···Notch DCB, DCF, DRB, DRF··U-shaped groove DL···Lower L-shaped groove DT···Position detection mechanism DT1···First position detection mechanism DT2···Second position detection mechanism FB···Fixed side component GP···Spacing HS···Housing IS··Image sensor L1~L4···Spacing LM···Lower side component LS··Lens body LS1···First lens body LS2···Second lens body M1~M6···Width MB··Movable side component MG··Magnetic field generating component MG1···First magnetic field generating component MG2···Second magnetic field generating component MR··Mirror N1~N5···Spacing ND···Section ND1···Section 1 ND2···Section 2 OA...Optical axis OP1, OP2...Through round hole PD...Piezoelectric drive part PD1...First piezoelectric drive part PD2...Second piezoelectric drive part PR...Protrusion part PR1L...First left protrusion PR1R...First right protrusion PR2L...Second left protrusion PR2R...Second right protrusion PR3L...Third left protrusion PR3R...Third right protrusion RH...Through round hole RHB...Rear side through hole RHF...Front side through hole RS...Concave TH...Through hole THB...Rear side through hole THF...Front side through hole TK...Thickness UCB, UCF, URB, URF...U-shaped groove UL...Upper L-shaped groove VP...Virtual plane W1~W9...Width

Claims

1. A fixed member; a lens holder capable of holding a lens body; a shaft member provided on the fixed member and extending along an optical axis direction so as to guide the lens holder; a piezoelectric driving unit having a piezoelectric element extending in a direction intersecting an optical axis direction, the piezoelectric element moving the lens holder along the optical axis direction, The piezoelectric driving unit is provided on the fixed member, a receiving member is provided in the lens holder, the receiving member facing the piezoelectric driving unit so as to come into contact with the piezoelectric driving unit, extending in a direction intersecting an extension direction of the piezoelectric element, and receiving a movement of the piezoelectric element; the piezoelectric driving unit has a contact member on a surface of the piezoelectric element facing the lens holder, and is biased toward the receiving member by a biasing member provided on the fixed-side member so that the receiving member and the contact member come into contact with each other.

4. A lens holder driving device comprising:

2. the lens holder has a holding portion that holds the lens body and a bearing portion that receives the shaft member, the receiving member is formed of a member separate from the lens holder, is fixed to the bearing portion, and is longer than the holding portion in the optical axis direction; The bearing portion is longer than the holding portion in the optical axis direction.

2. The lens holder driving device according to claim 1.

3. The shaft member includes a first shaft member and a second shaft member, The receiving member is provided at a position away from an imaginary plane including an axis of the first shaft member and an axis of the second shaft member.

3. The lens holder driving device according to claim 1 or 2.

4. The fixed member includes a bottom surface portion, The lens holder has an open top so that the lens body can be inserted therein. The receiving member is located above the imaginary plane.

4. The lens holder driving device according to claim 3.

5. The receiving member and the contact member are both made of metal, The receiving member is harder than the contact member.

5. The lens holder driving device according to claim 1.

6. the biasing member is configured by a leaf spring member extending in the optical axis direction, and has a pair of fixed parts fixed to the fixed-side member, a support part supporting the piezoelectric driving part, and a pair of elastically deformable elastic deformation parts provided between each of the pair of fixed parts and the support part, 6. The lens holder driving device according to claim 1.

7. the lens holder has a plurality of through holes extending in an optical axis direction; Each of the plurality of through holes is configured by a combination of a first groove portion that opens upward and a second groove portion that opens downward.

7. The lens holder driving device according to claim 1.

8. The lens holder is provided with a magnetic field generating member extending in the optical axis direction, the magnetic field generating member includes a magnet that is magnetized so that one end of the magnet in a first direction perpendicular to the optical axis direction becomes an N pole and the other end of the magnet becomes an S pole, a one-end magnetic member fixed to the one end, and an other-end magnetic member fixed to the other end, the one-end magnetic member has a plurality of first protrusions protruding toward the other end, the other end side magnetic member has a plurality of second protrusions protruding toward the one end side, the first protrusions and the second protrusions protrude in opposite directions and are alternately arranged in an extension direction of the magnetic field generating member, The fixed member is provided with a magnetic sensor that detects magnetic fields generated by the first protrusion and the second protrusion.

8. The lens holder driving device according to claim 1.

9. The lens body includes a first lens body and a second lens body having a common optical axis, the lens holder includes a first lens holder that holds the first lens body and a second lens holder that holds the second lens body; The shaft member includes a first shaft member and a second shaft member, the piezoelectric driving unit includes: a first piezoelectric driving unit having a first piezoelectric element extending in a direction intersecting the optical axis direction, and moving the first lens holder along the optical axis direction by movement of the first piezoelectric element; and a second piezoelectric driving unit having a second piezoelectric element extending in a direction intersecting the optical axis direction, and moving the second lens holder along the optical axis direction by movement of the second piezoelectric element; the first lens holder and the second lens holder are disposed to face each other in an optical axis direction, the first piezoelectric driving portion and the second piezoelectric driving portion are both provided on the fixed member, a first receiving member is provided in the first lens holder, the first receiving member facing the first piezoelectric driving unit so as to come into contact with the first piezoelectric driving unit, extending in a direction intersecting an extension direction of the first piezoelectric element, and receiving a movement of the first piezoelectric element; the first lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the first receiving member is provided on the first lens holder at a portion of the lens holder close to the first shaft member, a second receiving member is provided in the second lens holder, the second receiving member facing the second piezoelectric driving unit so as to come into contact with the second piezoelectric driving unit, extending in a direction intersecting an extension direction of the second piezoelectric element, and receiving a movement of the second piezoelectric element; the second lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the second receiving member is provided on the second lens holder at a portion of the second lens holder close to the second shaft member, the first piezoelectric driving unit has a first contact member on a surface of the first piezoelectric element facing the first lens holder, and is biased toward the first receiving member by a first biasing member provided on the fixed-side member so that the first receiving member and the first contact member come into contact with each other; the second piezoelectric driving unit has a second contact member on a surface of the second piezoelectric element facing the second lens holder, and is biased toward the second receiving member by a second biasing member provided on the fixed-side member so that the second receiving member and the second contact member come into contact with each other.

2. The lens holder driving device according to claim 1.

10. the first lens holder has a first holding portion that holds the first lens body, the first receiving member is formed to be longer than the first holding portion in the optical axis direction, the second lens holder has a second holding portion that holds the second lens body, the second receiving member is formed to be longer than the second holding portion in the optical axis direction, When the first holding portion and the second holding portion are in a state where they approach each other, at least a part of the first receiving member and at least a part of the second receiving member are configured to overlap in the optical axis direction. The lens holder driving device according to claim 9 .

11. Both the first receiving member and the second receiving member are provided at a position away from an imaginary plane including an axis of the first shaft member and an axis of the second shaft member.

11. The lens holder driving device according to claim 9 or 10.

12. The fixed member includes a bottom surface portion, the first lens holder has an open top so that the first lens body can be inserted therein; The first receiving member is located above the imaginary plane, the second lens holder has an upper opening so that the second lens body can be inserted therein; The second receiving member is located above the imaginary plane. The lens holder driving device according to claim 11.

13. the first biasing member is configured by a leaf spring member extending in the optical axis direction, and has a pair of first fixed portions fixed to the fixed-side member, a first support portion supporting the first piezoelectric driving portion, and a pair of first elastic deformation portions that are elastically deformable and provided between each of the pair of first fixed portions and the first support portions; the second biasing member is configured by a leaf spring member extending in the optical axis direction, and has a pair of second fixed portions fixed to the fixed-side member, a second support portion supporting the second piezoelectric driving portion, and a pair of second elastically deformable portions provided between each of the pair of second fixed portions and the second support portions; 13. The lens holder driving device according to claim 9, wherein the lens holder driving device is a lens holder driving device.

14. the first lens holder is provided with a first magnetic field generating member extending in an optical axis direction on the first shaft member side, the second lens holder is provided with a second magnetic field generating member extending in the optical axis direction on the second shaft member side, The fixed member is provided with a first magnetic sensor that detects a magnetic field generated by the first magnetic field generating member and a second magnetic sensor that detects a magnetic field generated by the second magnetic field generating member.

14. The lens holder driving device according to claim 9, wherein the lens holder driving device is a lens holder driving device.

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