Lens holder drive unit

Abstract

To provide a lens holder drive device in which two lens holders can be stably moved.SOLUTION: A lens holder drive device 101 comprises: a first piezoelectric drive unit PD1 moving a first lens holder 3A along an optical axis direction by movement of a first piezoelectric element 8A; and a second piezoelectric drive unit PD2 moving a second lens holder 3B along the optical axis direction by movement of a second piezoelectric element 8B. The first lens holder 3A has a portion close to a first shaft member 5A (first left shaft reception portion 32AL) and a portion close to a second shaft member 5B. The first piezoelectric drive unit PD1 is arranged in the first left shaft reception portion 32AL and contacts the first shaft member 5A. The second lens holder 3B has a portion close to the first shaft member 5A and a portion close to the second shaft member 5B (second right shaft reception portion 32BR). The second piezoelectric drive unit PD2 is arranged on the second right shaft reception portion 32BR and contacts the second shaft member 5B.SELECTED DRAWING: Figure 4

Description

[Technical field]

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

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

[0003] [Patent Document 1] JP 2006-098580 A Summary of the Invention [Problem to be solved by the invention]

[0004] The above-mentioned device is configured so that two lens holders can be moved separately using two piezoelectric elements.

[0005] However, in the above-mentioned device, the actuating parts of the two piezoelectric elements are configured to contact the same single drive shaft, and therefore, when the two lens holders are moved simultaneously, this configuration may cause the vibration (movement) of one of the two piezoelectric elements to interfere with the vibration (movement) of the other, which may adversely affect the movement of each of the two lens holders.

[0006] Therefore, it is desirable to provide a lens holder driving device that can move the two lens holders more stably. [Means for solving the problem]

[0007] A lens holder driving device according to an embodiment of the present invention includes a fixed side member, a first lens holder capable of holding a first lens body, a second lens holder capable of holding a second lens body arranged to have the same optical axis as the first lens body, a first shaft member and a second shaft member provided on the fixed side member and capable of guiding movement of the first lens holder and the second lens holder in the optical axis direction relative to the fixed side member, a first piezoelectric driving unit having a first piezoelectric element and moving the first lens holder along the optical axis direction by movement of the first piezoelectric element, and a second piezoelectric element having a second piezoelectric element and moving the first lens holder along the optical axis direction by movement of the second piezoelectric element. a second piezoelectric driving unit that moves the second lens holder along an optical axis direction, the first lens holder having a portion close to the first shaft member and a portion close to the second shaft member, the first piezoelectric driving unit being disposed in the portion close to the first shaft member in the first lens holder and in contact with the first shaft member, the second lens holder having a portion close to the first shaft member and a portion close to the second shaft member, the second piezoelectric driving unit being disposed in the portion close to the second shaft member in the second lens holder and in contact with the second shaft member, the first piezoelectric element extends in a direction intersecting with an axial direction of the first shaft member, the second piezoelectric element extends in a direction intersecting with an axial direction of the second shaft member, a first biasing member that biases the first piezoelectric driving unit toward the first shaft member is provided on the first lens holder, and a second biasing member that biases the second piezoelectric driving unit toward the second shaft member is provided on the second lens holder, the first biasing member being made of a plate-shaped metal member and including a first fixed portion fixed to the first lens holder, two first support portions that support two spaced apart locations on one surface side of the first piezoelectric driving unit, the second biasing member is made of a plate-shaped metal member and has a second fixed portion fixed to the second lens holder, two second support portions supporting two spaced apart positions on one surface side of the second piezoelectric drive portion, and two second elastically deformable portions provided between the second fixed portion and the two second support portions, ... There are. Effect of the Invention

[0008] The above-mentioned lens holder driving device can move the two lens holders more stably. [Brief description of the drawings]

[0009] [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. [Diagram 2] FIG. 2 is a schematic diagram of a camera module. [Diagram 3] FIG. [Figure 4] FIG. 4 is an exploded perspective view of a movable member supported by a shaft member. [Diagram 5] 4A and 4B are a top view and a right side view of a movable member supported by a shaft member. [Figure 6A] 11 is a perspective view of a piezoelectric driving portion pressed against a shaft member by a biasing member. FIG. [Figure 6B] FIG. [Figure 7] FIG. 2 is a perspective view of a biasing member attached to a lens holder. [Figure 8A] FIG. 2 is a top view of the lens holder driving device. [Figure 8B] FIG. 2 is a cross-sectional view of the lens holder driving device. [Figure 9A] FIG. 2 is an exploded perspective view of the magnetic field generating member before the magnetic member is attached to the fixed magnet. [Figure 9B] FIG. 2 is an assembled perspective view of the magnetic field generating member after the magnetic member is attached to the fixed magnet. [Figure 9C] FIG. 2 is a top view of the magnetic sensor and the magnetic field generating member. [Figure 9D] FIG. 4 is a right side view of the magnetic sensor and the magnetic field generating member. [Figure 10] FIG. 2 is a perspective view of a shaft member and a movable member. [Figure 11A] FIG. 2 is a front perspective view of the lens holder. [Figure 11B] FIG. 2 is a rear perspective view of the lens holder. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] 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.

[0011] In the illustrated example, X1 represents one direction of the X axis constituting the three-dimensional orthogonal 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 orthogonal 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 orthogonal coordinate system, and Z2 represents the other direction of the Z axis. The X1 side of the lens holder driving device 101 corresponds to the front side (subject side) of the lens holder driving device 101, and the X2 side of the lens holder driving device 101 corresponds to the rear side (imaging element side) of the lens holder driving device 101. Furthermore, the Y1 side of the lens holder driving device 101 corresponds to the left side of the lens holder driving device 101, and the Y2 side of the lens holder driving device 101 corresponds to the right side of the lens holder driving device 101. Moreover, 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. The same applies to the other figures.

[0012] 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.

[0013] The lens body LS is an example of an optical member 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 line is aligned with the optical axis OA. In the illustrated example, the lens body LS includes a first lens body LS1 constituting a zoom lens and a second lens body LS2 constituting a focus lens.

[0014] The lens holder driving device 101 is configured to be able to move the lens body LS along the optical axis direction by a piezoelectric driving unit PD (see FIG. 4) 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 FIG. 1B and FIG. 2, and can move the second lens body LS2 along the optical axis direction as indicated by the double-headed arrow AR2. That is, the lens holder driving device 101 can move each of the first lens body LS1 and the second lens body LS2 separately along the optical axis direction. Note that the optical axis of the first lens body LS1 and the optical axis of the second lens body LS2 are located on the same straight line (on the optical axis OA).

[0015] The housing HS is a part of the fixed member FB, and is composed of a cover member 1 and a base member 2.

[0016] The lens holder driving device 101 is used in a camera module CM such as a periscope-type camera module, as shown in Fig. 2. 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.

[0017] Typically, the lens holder driving device 101 is positioned farther from the subject than the mirror MR, as shown in FIG. 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.

[0018] Next, an overview of the lens holder driving device 101 will be described with reference to Fig. 1B and Fig. 3. Fig. 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. Fig. 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 (excluding the shaft member 5). The movable member MB is configured to be moved in the optical axis direction by the piezoelectric driving unit PD while being guided by the shaft member 5.

[0019] 1B, the lens holder driving device 101 includes a cover member 1 and a lower member LM that constitute a part of a housing HS (fixed member FB). The cover member 1 is configured to cover an upper surface of the lower member LM. In this embodiment, the cover member 1 is made of a synthetic resin material, but may be made of a non-magnetic material such as austenitic stainless steel.

[0020] The base member 2 is a member that constitutes a part of the housing HS. In this embodiment, the base member 2 is made of a synthetic resin material, similar to the cover member 1, but may be made of a non-magnetic material such as austenitic stainless steel.

[0021] 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 and flat bottom surface portion 2B that is provided so as to be continuous with the lower end (the end on the Z2 side) of the outer wall portion 2A. In the illustrated example, the outer wall portion 2A and the bottom surface portion 2B are separably configured as separate members and are integrated with an adhesive or the like, but the outer wall portion 2A and the bottom surface portion 2B may be configured as a single member. 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 perpendicularly 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 perpendicularly to the second side plate portion 2A2 and the fourth side plate portion 2A4. The first side plate portion 2A1 has a through hole OP1 for receiving light LT from the subject reflected by the mirror MR. Similarly, the third side plate portion 2A3 has a through hole OP2 for allowing the light LT to reach the imaging element IS. In addition, the cover member 1 is joined to the base member 2 by an adhesive or the like to form a housing HS together with the base member 2.

[0022] 3, a notch 2T for passing the terminal portion 10T of the circuit board 10 is formed in each of the first side plate portion 2A1 and the third side plate portion 2A3 of the base member 2. With this configuration, the terminal portion 10T of the circuit board 10 is disposed outside the housing HS.

[0023] As shown in FIG. 3, the lower member LM includes a lens holder 3 as a movable member MB, a base member 2 and a shaft member 5 as a fixed member FB, and a position detection mechanism DT.

[0024] The lens holder 3 is configured to be able 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 be able to hold a first lens body LS1, and a second lens holder 3B configured to be able to hold a second lens body LS2. The first lens holder 3A and the second lens holder 3B have the same shape and size.

[0025] Here, the details of the movable side member MB will be described with reference to Figs. 4 and 5. Figs. 4 and 5 are views of the movable side member MB supported by the shaft member 5. Specifically, Fig. 4 is an exploded perspective view of the movable side member MB supported by the shaft member 5. The upper view of Fig. 5 is a top view of the movable side member MB supported by the shaft member 5, and the lower view of Fig. 5 is a right side view of the movable side member MB supported by the shaft member 5. In Figs. 4 and 5, 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. In Fig. 5, for clarity, the circuit board 10 and the cover member CV are omitted.

[0026] 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 in the optical axis direction in a state parallel to each other. In the illustrated example, the shaft member 5 is configured so that one end is fitted into a groove portion 2G (see FIG. 3) formed in the third side plate portion 2A3 of the base member 2, and the other end is fitted into another groove portion 2G (not visible in FIG. 3) formed in the first side plate portion 2A1 of the base member 2. However, the shaft member 5 may be configured so that one end is inserted into a through hole (not shown) formed in the third side plate portion 2A3 of the base member 2, and the other end is inserted into another through hole (not shown) formed in the first side plate portion 2A1 of the base member 2. The shaft member 5 may be fixed to the base member 2 (the third side plate portion 2A3 and the first side plate portion 2A1) by an adhesive. The first shaft member 5A and the second shaft member 5B are made of a magnetic metal.

[0027] 4, 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 rotation of the lens holder 3 around the shaft member 5.

[0028] 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.

[0029] 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.

[0030] More specifically, the first left bearing portion 32AL has a first through hole TH1 capable of receiving the first shaft member 5A as shown in Fig. 4. Similarly, the second right bearing portion 32BR has a second through hole TH2 capable of receiving the second shaft member 5B as shown in Fig. 4.

[0031] On the other hand, the first right bearing portion 32AR has a first semicircular cutout CT1 that opens to the right (Y2 direction) and can receive the second shaft member 5B, as shown in Fig. 4. Similarly, the second left bearing portion 32BL has a second semicircular cutout CT2 that opens to the left (Y1 direction) and can receive the first shaft member 5A, as shown in Fig. 4.

[0032] A movable magnet 4 is attached to one of the two bearing portions 32 of the lens holder 3. The movable magnet 4 is a member arranged to suppress rattling of the lens holder 3 around the shaft member 5, and includes a first movable magnet 4A and a second movable magnet 4B.

[0033] Specifically, as shown in FIG. 4, a first movable magnet 4A is attached to the first right bearing portion 32AR of the first lens holder 3A, and a second movable magnet 4B is attached to the second left bearing portion 32BL of the second lens holder 3B.

[0034] The first movable magnet 4A is configured so that a portion of the first right bearing portion 32AR of the first lens holder 3A can be pressed from above against the upper surface of the second shaft member 5B by utilizing the magnetic attraction force acting between the first movable magnet 4A and the second shaft member 5B.

[0035] The second movable magnet 4B is configured so that a portion of the second left bearing portion 32BL of the second lens holder 3B can be pressed from above against the upper surface of the first shaft member 5A by utilizing the magnetic attraction force acting between the second movable magnet 4B and the first shaft member 5A.

[0036] A cover member CV is attached to the other of the two bearing portions 32 of the lens holder 3. That is, of the two bearing portions 32 of the lens holder 3, the cover member CV is attached to the one to which the movable magnet 4 is not attached.

[0037] The cover member CV is a member disposed to cover the piezoelectric driving unit PD, and includes a metal member 14 and a synthetic resin member 15. In the illustrated example, the cover member CV includes a first cover member CV1 attached to the first lens holder 3A and a second cover member CV2 attached to the second lens holder 3B.

[0038] 4, a first cover member CV1 is attached to the first left bearing portion 32AL of the first lens holder 3A, and a second cover member CV2 is attached to the second right bearing portion 32BR of the second lens holder 3B. The first cover member CV1 is made up of a first metal member 14A and a first synthetic resin member 15A, and the second cover member CV2 is made up of a second metal member 14B and a second synthetic resin member 15B.

[0039] More specifically, the first cover member CV1 is insert molded by injecting synthetic resin into a mold with the first metal member 14A placed in the mold as an insert. The first cover member CV1 may be formed by outsert molding. The first cover member CV1 may also be integrally formed from metal or synthetic resin. The same applies to the second cover member CV2.

[0040] Next, the piezoelectric driving unit PD will be described with reference to Fig. 6A and Fig. 6B. Fig. 6A is a perspective view of the piezoelectric driving unit PD pressed against the shaft member 5 by the biasing member 13, and Fig. 6B is an exploded perspective view of the piezoelectric driving unit PD.

[0041] 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 utilizes 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.

[0042] The piezoelectric driving unit PD is configured to be biased inward (in a direction approaching the optical axis OA) by a biasing member 13 fixed to the lens holder 3 and pressed against the shaft member 5. 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. 6B) formed during bending vibration (circular motion described later) of the piezoelectric element 8. The biasing member 13 and the piezoelectric driving unit PD are joined together by, for example, an adhesive.

[0043] In the illustrated example, the piezoelectric driving unit PD includes a first piezoelectric driving unit PD1 that moves the first lens holder 3A along the optical axis direction, and a second piezoelectric driving unit PD2 that moves the second lens holder 3B along the optical axis direction, as shown in Fig. 4. The first piezoelectric driving unit PD1 includes a first piezoelectric element 8A, a first contact member 9A, and a first circuit board 10A, and the second piezoelectric driving unit PD2 includes a second piezoelectric element 8B, a second contact member 9B, and a second circuit board 10B.

[0044] The biasing member 13 includes a first biasing member 13A arranged so as to press the first piezoelectric driving unit PD1 against the first shaft member 5A, and a second biasing member 13B arranged so as to press the second piezoelectric driving unit PD2 against the second shaft member 5B.

[0045] 6A and 6B show the first piezoelectric driving unit PD1 pressed against the first shaft member 5A by the first biasing member 13A. However, the following description with reference to Fig. 6A and 6B also applies to the second piezoelectric driving unit PD2 pressed against the second shaft member 5B by the second biasing member 13B. This is because the first piezoelectric driving unit PD1 and the second piezoelectric driving unit PD2 have the same configuration.

[0046] In the illustrated example, the first piezoelectric element 8A extends in the Z-axis direction, which is a direction perpendicular to the optical axis direction (X-axis direction) (direction perpendicular to the optical axis OA), and is configured to realize bending vibration (circular motion) having 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 driving unit PD1 can cause the first piezoelectric element 8A to perform bending vibration (circular motion) so that the locus drawn by the midpoint of the first piezoelectric element 8A becomes a circular orbit centered on the rotation axis 8AX when the application of a voltage to the piezoelectric element constituting the first layer and the application of a voltage to the piezoelectric element constituting the second layer are performed separately at appropriate timing. That is, the first piezoelectric element 8A can realize a motion (circular motion) in which the midpoint draws a circle. In the example shown in FIG. 6B, the rotation axis 8AX is parallel to the Z axis. Furthermore, the first piezoelectric driving unit PD1 can switch the moving direction (rotation direction) of the midpoint following the circular orbit between clockwise and counterclockwise as viewed from the Z1 side by applying a voltage at an appropriate timing. That is, the first piezoelectric driving unit PD1 can switch the moving direction of the first lens holder 3A along the optical axis direction. 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) but may be approximately circular.

[0047] In FIG. 6B, the dotted arrows drawn around the first piezoelectric element 8A represent the bending vibration of the first piezoelectric element 8A (circular motion in which the first piezoelectric element 8A rotates clockwise around the rotation axis 8AX while bending). In this case, the first piezoelectric drive unit PD1 including the first contact member 9A in contact with the first shaft member 5A moves backward (X2 direction). Although not shown by the dotted arrows, the first piezoelectric element 8A can also rotate counterclockwise around the rotation axis 8AX while bending. In this case, the first piezoelectric drive unit PD1 including the first contact member 9A in contact with the first shaft member 5A moves forward (X1 direction).

[0048] That is, the first lens holder 3A to which the first piezoelectric driver PD1 is attached is moved backward (X2 direction) when the rotation direction of the midpoint of the first piezoelectric element 8A is clockwise in top view, and is moved forward (X1 direction) when the rotation direction of the midpoint of the first piezoelectric element 8A is counterclockwise. In the illustrated example, 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).

[0049] The first contact member 9A is attached to the first piezoelectric element 8A and is configured to come into contact with the first shaft member 5A. In the illustrated example, the first contact member 9A is bonded to the inner surface of the first piezoelectric element 8A by an adhesive so as to cover the entire inner surface (Y2 side, which is the side facing the optical axis OA) of the first piezoelectric element 8A. The first contact member 9A is made of a metal such as stainless steel and is 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 the outer surface (Y2 side surface) of its central part comes into contact with the first shaft member 5A. Specifically, the first contact member 9A is configured to come into contact with the first shaft member 5A at a portion (corresponding to an antinode of the bending vibration) where the amplitude of the bending vibration (circular motion) is maximum. In addition, the surface of the first contact member 9A on the side (Y2 side) that comes into contact with the first shaft member 5A has a curved shape (cylindrical shape). The first shaft member 5A is typically made of a metal such as stainless steel. In the illustrated example, the first shaft member 5A is a cylindrical rod member made of stainless steel and extending in the optical axis direction. Note that, as long as the contact between the first contact member 9A and the first shaft member 5A is realized, the length dimension of the first contact member 9A in the Z-axis direction may be different from the length dimension of the first piezoelectric element 8A. In the illustrated example, the length dimension of the first contact member 9A in the Z-axis direction is approximately the same as the length dimension of the first piezoelectric element 8A.

[0050] The first circuit board 10A is a board including a conductive pattern, and is configured to be able to electrically connect an external power source and the first piezoelectric element 8A. In the illustrated example, the first circuit board 10A is a flexible printed circuit board having flexibility, and includes an adhesive fixing portion 10F, a sensor fixing portion 10S, a piezoelectric element fixing portion 10P, and a curved portion 10W.

[0051] In the illustrated example, as shown in FIG. 6A, the first circuit board 10A has an outer (Y1 side) surface of the adhesive fixing portion 10F fixed to an inner (Y2 side) surface of the second side plate portion 2A2 of the base member 2 by an adhesive. The first circuit board 10A is configured to be deformed in response to the movement of the first lens holder 3A in the optical axis direction, and to apply a voltage to the first piezoelectric element 8A while moving the position of the curved portion 10W. More specifically, the curved portion 10W moves backward in response to the movement of the first lens holder 3A in the rearward (X2 direction), and moves forward in response to the movement of the first lens holder 3A in the forward (X1 direction). The first circuit board 10A is configured such that the inner (Y2 side) surface of the piezoelectric element fixing portion 10P is bonded to the first piezoelectric element 8A by an anisotropic conductive adhesive or an anisotropic conductive adhesive film or the like. The first circuit board 10A is configured to be folded back on the front side of the sensor fixing part 10S so that the sensor fixing part 10S is located on the outer side (Y1 side) of the first biasing member 13A. The first circuit board 10A is configured to mount the first magnetic sensor 6A (see FIG. 3) on the outer surface (Y1 side) of the sensor fixing part 10S. The inner surface (Y2 side) of the sensor fixing part 10S is fixed to the outer surface (Y1 side) of the first cover member CV1 with an adhesive (see FIGS. 8A and 8B).

[0052] In the illustrated example, the biasing member 13 is composed of a leaf spring member. Specifically, as shown in FIG. 6B, the first biasing member 13A has a fixed portion 13F fixed to the first left bearing portion 32AL of the first lens holder 3A, a support portion 13S supporting the first piezoelectric driving portion PD1, and an elastically deformable elastic deformation portion 13E provided between the fixed portion 13F and the support portion 13S. The first biasing member 13A is fixed to the first left bearing portion 32AL via the fixed portion 13F so that the support portion 13S and the elastic deformation portion 13E do not come into contact with the first left bearing portion 32AL. The following description with reference to FIG. 6B relates to the first biasing member 13A, but is similarly applied 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 fixing portion 13F includes a front fixing portion 13FF and a rear fixing portion 13FB, and the supporting portion 13S includes an upper supporting portion 13SU and a lower supporting portion 13SD. The elastically deforming portion 13E includes an upper elastically deforming portion 13EU and a lower elastically deforming portion 13ED provided between the rear fixing portion 13FB and the front fixing portion 13FF. The front fixing portion 13FF and the rear fixing portion 13FB have the same shape and size, the upper supporting portion 13SU and the lower supporting portion 13SD have the same shape and size, and the upper elastically deforming portion 13EU and the lower elastically deforming portion 13ED have the same shape and size. That is, the first biasing member 13A is configured to be plane-symmetrical with respect to a symmetrical plane parallel to the YZ plane (a plane that divides the first biasing member 13A into front and rear). The first biasing member 13A is also configured to be symmetrical with respect to another symmetrical plane parallel to the XY plane (a plane that bisects the first biasing member 13A into upper and lower parts). The same is true for the second biasing member 13B.

[0054] The support portion 13S is bent from the elastic deformation portion 13E into an L-shape and configured to protrude toward the side (Y2 side) where the lens holder 3 is located. A recess RS is formed at the tip of the support portion 13S. The recess RS is a recess that is open toward the side (Y2 side) where the first lens holder 3A is located. Specifically, the recess RS is formed at the tip of each of the upper support portion 13SU and the lower support portion 13SD so as to have the same shape and size. As shown in FIG. 6A, a part of the first piezoelectric driving portion PD1 is disposed within the recess RS, and is fixed to the support portion 13S by an adhesive in a state of contact with the inner edge portion BE of the recess RS.

[0055] 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. 6B, and the first piezoelectric driver PD1 is disposed between the front edge and the rear edge, as shown in Fig. 6A.

[0056] The position where the inner edge BE of the recess RS contacts the first piezoelectric driving part PD1 corresponds to the position of the node ND of the first piezoelectric element 8A that realizes bending vibration (circular motion). The position of the node ND includes the position of the first node ND1 and the position of the second node ND2. In FIG. 6B, for clarity, a cross pattern is added to the position of the node ND.

[0057] The position (position of node ND) where the inner edge BE of the recess RS contacts the first piezoelectric driving unit PD1 corresponds to a position at a predetermined distance from the end of the first piezoelectric driving unit PD1. The predetermined distance is, for example, approximately one-quarter of the total length of the piezoelectric driving unit PD.

[0058] The first piezoelectric driving unit PD1 and the support unit 13S are fixed with an adhesive. Specifically, the first piezoelectric driving unit PD1 (first circuit board 10A) and the support unit 13S are fixed to each other with an adhesive at the inner edge portion BE of the recess RS. The first circuit board 10A of the first piezoelectric driving unit PD1 and the first biasing member 13A are fixed with an adhesive at the contact portion AF of the front fixing portion 13FF and the contact portion AB of the rear fixing portion 13FB. In the illustrated example, the adhesive is an ultraviolet-curing adhesive. However, the adhesive may be another type of adhesive, such as a moisture-curing or heat-curing adhesive.

[0059] As shown in Fig. 6B, the elastic deformation portion 13E has a portion extending forward (X1 direction) from the support portion 13S and a portion extending rearward (X2 direction) from the support portion 13S. Specifically, the upper elastic deformation portion 13EU has a portion extending forward from the upper support portion 13SU and a portion extending rearward from the upper support portion 13SU, and the lower elastic deformation portion 13ED has a portion extending forward from the lower support portion 13SD and a portion extending rearward from the lower support portion 13SD. The extension direction of the elastic deformation portion 13E is along the optical axis direction.

[0060] Fixed portions 13F are provided on both ends of the elastic deformation portion 13E. As shown in FIG. 7, the fixed portions 13F are attached so as to sandwich the upper and lower ends of the bearing portion 32 (second right bearing portion 32BR) of the lens holder 3 (second lens holder 3B).

[0061] FIG. 7 is a perspective view of the urging member 13 attached to the lens holder 3. Specifically, FIG. 7 is a perspective view of the second urging member 13B attached to the second lens holder 3B. The following description with reference to FIG. 7 also applies to the first urging member 13A attached to the first lens holder 3A. This is because the first urging member 13A and the second urging member 13B have the same configuration. Note that in FIG. 7, a cross pattern is provided on the urging member 13 (second urging member 13B) for clarity.

[0062] In the example shown in Fig. 7, the fixing portion 13F of the second biasing member 13B includes a rear fixing portion 13FB and a front fixing portion 13FF. The rear fixing portion 13FB and the front fixing portion 13FF each have an upper bent portion UB and a lower bent portion DB (see also Fig. 6A). The second biasing member 13B is configured so that the pair of upper bent portions UB and the pair of lower bent portions DB can sandwich the right end portion of the second right bearing portion 32BR of the second lens holder 3B. The second biasing member 13B may be fixed to the second right bearing portion 32BR by an adhesive or may be reinforced by an adhesive.

[0063] The second biasing member 13B fixed to the right end (the end on the Y2 side) of the second right bearing portion 32BR of the second lens holder 3B is covered with the second cover member CV2. The second piezoelectric driving portion PD2 fixed to the inside (the Y1 side) of the second biasing member 13B is disposed inside the second space SP2 between the second front wall portion FW2 and the second rear wall portion BW2 of the second right bearing portion 32BR, and the second space SP2 is sealed by the second cover member CV2.

[0064] In the illustrated example, the second cover member CV2 is fixed to the second right bearing portion 32BR by fitting a rectangular protrusion PT formed on the upper end of the second right bearing portion 32BR into a notch CU formed in the upper plate portion of the second metal member 14B and by fitting a circular protrusion (not visible in FIG. 7) formed on the lower end of the second right bearing portion 32BR into a circular hole BH formed in the lower plate portion of the second metal member 14B. The same applies to the first cover member CV1.

[0065] This configuration can house the piezoelectric driver PD in a space sealed by the lens holder 3 and the cover member CV. Therefore, this configuration can prevent wear powder generated by contact between the shaft member 5 and the contact member 9 from escaping from the sealed space, and can therefore prevent the wear powder from reaching the image sensor IS. Note that the sealing by the second cover member CV2 only needs to prevent wear powder from escaping from the second space SP2, and means a sealing to the extent that air can enter and exit.

[0066] Next, the movable member MB and the position detection mechanism DT will be described with reference to Fig. 3, Fig. 8A, and Fig. 8B. Fig. 8A is a top view of the lens holder driving device 101. Fig. 8B is a cross-sectional view of the lens holder driving device 101. Specifically, Fig. 8B is a cross-sectional view of the lens holder driving device 101 viewed from the X1 side on a plane parallel to the YZ plane including the cutting line (dashed line VIIIB-VIIIB) shown in Fig. 8A. Note that in Figs. 8A and 8B, for clarity, the illustration of the cover member 1 and the base member 2 is omitted, 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.

[0067] As shown in Fig. 8A, the movable side member MB includes a first movable side member MB1 and a second movable side member MB2. The first movable side member MB1 includes a first lens holder 3A, a first movable magnet 4A, a first magnetic sensor 6A, a first cover member CV1, and a first lens body LS1. The second movable side member MB2 includes a second lens holder 3B, a second movable magnet 4B, a second magnetic sensor 6B, a second cover member CV2, and a second lens body LS2.

[0068] As shown in FIG. 8B, the first movable magnet 4A is provided at a position away from the imaginary plane VP. Specifically, the first movable magnet 4A is provided at a position not on the imaginary plane VP (at a position higher than the imaginary plane VP). The imaginary plane VP is a virtual plane including the axis line (axis 5AX) of the first shaft member 5A and the axis line (axis 5BX) of the second shaft member 5B, which are parallel to each other. In the example shown in FIG. 8B, the lens holder 3 is configured so that the optical axis OA of the lens body LS is located on the imaginary plane VP. Also, in the example shown in FIG. 8B, the movable-side member MB is configured so that the distance between the optical axis OA and the axis line (axis 5AX) of the first shaft member 5A is equal to the distance between the optical axis OA and the axis line (axis 5BX) of the second shaft member 5B. In the example shown in FIG. 8B, the first movable side member MB1 including the first lens holder 3A, the first movable magnet 4A, the first cover member CV1, the first lens body LS1, and the first piezoelectric driving unit PD1 is configured so that its center of gravity is located on the virtual plane VP. This is to suppress the generation of torque around the center of gravity when the first movable side member MB1 moves along the shaft member 5. The same is true for the second movable side member MB2. Specifically, the base member 2 as the fixed side member FB has a bottom surface portion 2B as shown in FIG. 3. As shown in FIG. 4, the lens holder 3 is open at the top so that it can accommodate (receive) the lens body LS. As shown in FIG. 8B, the movable magnet 4 (first movable magnet 4A) is provided at a position offset above the virtual plane VP (Z1 side). The movable magnet 4 may be provided at a position offset below the virtual plane VP (Z2 side).

[0069] 8B, 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 fixed magnet 11 and a magnetic member 12.

[0070] 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 configured with a giant magneto resistive effect (GMR) element, and is configured to measure a voltage value that changes according to the magnitude of the magnetic field generated by the magnetic field generating member MG that the magnetic sensor 6 receives, and detect the position of the lens holder 3 to which the magnetic sensor 6 is attached. The magnetic sensor 6 is configured to output a larger voltage value as the N pole portion approaches, and a smaller voltage value as the S pole portion approaches. However, the magnetic sensor 6 may be configured to output a smaller voltage value as the N pole portion approaches, and a larger voltage value as the S 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 Magneto Resistive (SMR) element, an Anisotropic Magneto Resistive (AMR) element, or a Tunnel Magneto Resistive (TMR) element, or may be configured to detect the position of the lens holder 3 using a Hall element or the like.

[0071] 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 3 A and a second position detection mechanism DT2 that detects the position of the second lens holder 3 B. The first position detection mechanism DT1 includes a first magnetic sensor 6A and a first magnetic field generating member MG1, and the second position detection mechanism DT2 includes a second magnetic sensor 6B and a second magnetic field generating member MG2.

[0072] 8A, the first magnetic field generating member MG1 has a length (width) in the optical axis direction of width WD1, and the second magnetic field generating member MG2 has a length (width) in the optical axis direction of width WD2. The first magnetic field generating member MG1 and the second magnetic field generating member MG2 overlap each other over a distance DS in the optical axis direction.

[0073] 8B, the first magnetic field generating member MG1 includes a first fixed magnet 11A and a first magnetic member 12A, and the second magnetic field generating member MG2 includes a second fixed magnet 11B and a second magnetic member 12B. The first magnetic member 12A includes a first upper magnetic member 12AU and a first lower magnetic member 12AD, and the second magnetic member 12B includes a second upper magnetic member 12BU and a second lower magnetic member 12BD.

[0074] Here, the magnetic field generating member MG will be described in detail with reference to Figs. 9A to 9D. Fig. 9A is an exploded perspective view of the magnetic field generating member MG before the magnetic member 12 is attached to the fixed magnet 11. Fig. 9B is an assembled perspective view of the magnetic field generating member MG after the magnetic member 12 is attached to the fixed magnet 11. Figs. 9C and 9D show the positional relationship between the magnetic sensor 6 and the magnetic field generating member MG that changes according to the movement of the lens holder 3 in the optical axis direction. Specifically, Fig. 9C is a top view of the magnetic sensor 6 and the magnetic field generating member MG, and Fig. 9D is a right side view of the magnetic sensor 6 and the magnetic field generating member MG. Figs. 9A to 9D relate to the first magnetic field generating member MG1 attached to the inner surface of the second side plate portion 2A2 of the base member 2. In the illustrated example, the first magnetic field generating member MG1 is fixed to the inner surface of the second side plate portion 2A2 of the base member 2 by an adhesive. However, the following description with reference to FIGS. 9A to 9D also applies to the second magnetic field generating member MG2 attached to the inner surface of the fourth side plate portion 2A4 of the base member 2 in the same manner.

[0075] As shown in FIG. 9A, the first magnetic field generating member MG1 includes a first fixed magnet 11A, a first upper magnetic member 12AU, and a first lower magnetic member 12AD.

[0076] The first fixed magnet 11A is a permanent magnet magnetized with two poles in the Z-axis direction, which is a direction perpendicular to the optical axis direction. In the illustrated example, the first fixed magnet 11A is magnetized so that one end (upper end) in the direction perpendicular to the optical axis direction (Z-axis direction) is an N pole and the other end (lower end) is an S pole. In Fig. 9A, for clarity, a fine cross pattern is applied to the N-pole portion of the first fixed magnet 11A, and a coarse cross pattern is applied to the S-pole portion of the first fixed magnet 11A.

[0077] 9B, the first upper magnetic member 12AU and the first lower magnetic member 12AD are both connected to the first fixed magnet 11A. In the illustrated example, the first upper magnetic member 12AU and the first lower magnetic member 12AD are fixed to the first fixed magnet 11A by an adhesive.

[0078] Specifically, the first upper magnetic member 12AU is connected to the N-pole portion, which is one end (upper end) of the first fixed magnet 11A, and is magnetized to the N-pole, and the first lower magnetic member 12AD is connected to the S-pole portion, which is the other end (lower end) of the first fixed magnet 11A, and is magnetized to the S-pole. Therefore, in FIG. 9B, the first upper magnetic member 12AU is provided with a fine cross pattern similar to the N-pole portion of the first fixed magnet 11A, and the first lower magnetic member 12AD is provided with a coarse cross pattern similar to the S-pole portion of the first fixed magnet 11A. The same is true in FIG. 9C and FIG. 9D. However, in the state shown in FIG. 9A, neither the first upper magnetic member 12AU nor the first lower magnetic member 12AD is connected to the first fixed magnet 11A and is not magnetized, so no cross pattern is provided on the first upper magnetic member 12AU nor the first lower magnetic member 12AD.

[0079] In the illustrated example, as shown in Fig. 9A, the first magnetic member 12A is configured to have a bar-shaped portion BP and an L-shaped protrusion portion PR that protrudes from the bar-shaped portion BP in the Y-axis direction and then in the Z-axis direction. Specifically, the first upper magnetic member 12AU has an upper bar-shaped portion BPU and three protrusion portions PR (first upper protrusion portion PR1U to third upper protrusion portion PR3U) that protrude from the upper bar-shaped portion BPU to the right (Y2 direction) and then protrude toward the first fixed magnet 11A side (Z2 direction). The first lower magnetic member 12AD has a lower bar-shaped portion BPD and three protrusion portions PR (first lower protrusion portion PR1D to third lower protrusion portion PR3D) that protrude from the lower bar-shaped portion BPD to the right (Y2 direction) and then protrude toward the first fixed magnet 11A side (Z1 direction).

[0080] In addition, in the illustrated example, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured so that the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D are arranged alternately in the extension direction (X-axis direction) of the first magnetic field generating member MG1.

[0081] Specifically, as shown in FIG. 9B, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured such that the first upper protrusion PR1U is arranged at the front end (X1 side) in the extension direction (X-axis direction) of the first magnetic field generating member MG1, the first lower protrusion PR1D is arranged behind it (X2 side), the second upper protrusion PR2U is arranged further behind it (X2 side), the second lower protrusion PR2D is arranged further behind it (X2 side), the third upper protrusion PR3U is arranged further behind it (X2 side), and the third lower protrusion PR3D is arranged further behind it (X2 side).

[0082] Also, as shown in FIG. 9A, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured so that the width M1 of the first upper protrusion PR1U, the width M2 of the second upper protrusion PR2U, the width M3 of the third upper protrusion PR3U, the width M4 of the first lower protrusion PR1D, the width M5 of the second lower protrusion PR2D, and the width M6 of the third lower protrusion PR3D in the extension direction (X-axis direction) of the first magnetic field generating member MG1 are all the same.

[0083] Furthermore, as shown in FIG. 9A, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured so that the distance L1 between the first upper protrusion PR1U and the second upper protrusion PR2U in the extension direction (X-axis direction) of the first magnetic field generating member MG1, the distance L2 between the second upper protrusion PR2U and the third upper protrusion PR3U, the distance L3 between the first lower protrusion PR1D and the second lower protrusion PR2D, and the distance L4 between the second lower protrusion PR2D and the third lower protrusion PR3D are all the same.

[0084] Furthermore, as shown in FIG. 9B, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured so that the distance N1 between the first upper protrusion PR1U and the first lower protrusion PR1D in the extension direction (X-axis direction) of the first magnetic field generating member MG1, the distance N2 between the first lower protrusion PR1D and the second upper protrusion PR2U, the distance N3 between the second upper protrusion PR2U and the second lower protrusion PR2D, the distance N4 between the second lower protrusion PR2D and the third upper protrusion PR3U, and the distance N5 between the third upper protrusion PR3U and the third lower protrusion PR3D are all the same.

[0085] Furthermore, as shown in FIG. 9C, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured so that the thicknesses TK of the portions of the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D protruding in the Z-axis direction (toward the first fixed magnet 11A) are all the same.

[0086] Furthermore, as shown in FIG. 9C, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured so that the distance GP between the right-side (Y2 side) end faces of each of the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D and the magnetic sensor 6 (first magnetic sensor 6A) fixed to the lens holder 3 (not shown) is the same.

[0087] In this way, the first upper magnetic member 12AU and the first lower magnetic member 12AD are formed as the same part having the same shape and the same size. However, the first upper magnetic member 12AU and the first lower magnetic member 12AD may be formed as separate parts having different shapes or sizes. For example, the first upper magnetic member 12AU and the first lower magnetic member 12AD may be configured so that the widths M1 to M6 are different from each other. The same applies to the intervals L1 to L4, and the same applies to the intervals N1 to N5. The first upper magnetic member 12AU and the first lower magnetic member 12AD may be configured so that the thicknesses TK of the parts of the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D protruding in the Z-axis direction (toward the first fixed magnet 11A) are different from each other. The same applies to the interval GP.

[0088] In the illustrated example, the first upper magnetic member 12AU and the first lower magnetic member 12AD are configured such that the tips of the portions of the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D that protrude in the Z-axis direction (toward the first fixed magnet 11A) reach the boundary line between the N-pole portion and the S-pole portion of the first fixed magnet 11A in the right side view as shown in Fig. 9D. However, the first upper magnetic member 12AU and the first lower magnetic member 12AD may be configured such that the protrusion amounts of the portions of the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D that protrude in the Z-axis direction (toward the first fixed magnet 11A) are different from each other.

[0089] The center diagram of Fig. 9C and the center diagram of Fig. 9D show the positional relationship between the first magnetic field generating member MG1 and the first magnetic sensor 6A when the first lens holder 3A is located at the reference position shown in Fig. 1B. The upper diagram of Fig. 9C and the upper diagram of Fig. 9D show the positional relationship between the first magnetic field generating member MG1 and the first magnetic sensor 6A when the first lens holder 3A moves forward (X1 direction) from the reference position. The lower diagram of Fig. 9C and the lower diagram of Fig. 9D show the positional relationship between the first magnetic field generating member MG1 and the first magnetic sensor 6A when the first lens holder 3A moves backward (X2 direction) from the reference position.

[0090] The first magnetic sensor 6A is provided on a sensor fixing portion 10S of a first circuit board 10A fixed to the first lens holder 3A so as to detect the magnetic fields generated by each of the first upper protrusion PR1U to the third upper protrusion PR3U and the first lower protrusion PR1D to the third lower protrusion PR3D.

[0091] When the first lens holder 3A is located in the reference position, the first magnetic sensor 6A partially faces the second upper protrusion portion PR2U of the first upper magnetic member 12AU, which is the N-pole portion, as shown in the central diagram of Figure 9C and the central diagram of Figure 9D.

[0092] Then, when the first lens holder 3A moves forward (in the X1 direction) from the reference position, the first magnetic sensor 6A moves away from the second upper protrusion PR2U of the first upper magnetic member 12AU, which is the N-pole portion, and comes partially opposite the first lower protrusion PR1D of the first lower magnetic member 12AD, which is the S-pole portion, as shown in the upper diagram of Figure 9C and the upper diagram of Figure 9D.

[0093] Furthermore, when the first lens holder 3A moves backward (in the X2 direction) from the reference position, the first magnetic sensor 6A moves away from the second upper protrusion PR2U of the first upper magnetic member 12AU, which is the N-pole portion, and comes partially opposite the second lower protrusion PR2D of the first lower magnetic member 12AD, which is the S-pole portion, as shown in the lower diagram of Figure 9C and the lower diagram of Figure 9D.

[0094] By utilizing the above-mentioned position detection mechanism DT, a control device (not shown) connected to the first magnetic sensor 6A via a conductive pattern formed on the first circuit board 10A can detect the position of the first lens holder 3A based on the voltage value output by the first magnetic sensor 6A. Note that, although the control device is provided outside the housing HS in the illustrated example, it may be provided inside the housing HS.

[0095] 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, or it may be composed of one multipolar permanent magnet, or it may be composed of a combination of multiple multipolar permanent magnets.

[0096] Next, the movement of the movable side member MB will be described with reference to FIG. 10. FIG. 10 is a perspective view of the shaft member 5 and the movable side member MB. Specifically, the upper part of FIG. 10 shows the positional relationship of the main members (lens holder 3, shaft member 5, and lens body LS) when the first movable side member MB1 and the second movable side member MB2 are in their reference positions. The middle part of FIG. 10 shows the positional relationship of the main members when the first movable side member MB1 moves to the most front side (X1 side) and the second movable side member MB2 moves to the most front side (X1 side). The lower part of FIG. 10 shows the positional relationship of the main members when the second movable side member MB2 moves to the most rear side (X2 side) and the first movable side member MB1 moves to the most rear side (X2 side).

[0097] As shown in FIG. 10, the lens holder driving device 101 can move the first movable member MB1 and the second movable member MB2 separately along the optical axis direction.

[0098] Next, the lens holder 3 will be described in detail with reference to Figures 11A and 11B. Figure 11A is a front perspective view of the lens holder 3, and Figure 11B is a rear perspective view of the lens holder 3. The description with reference to Figures 11A and 11B relates to the first lens holder 3A, but also applies to the second lens holder 3B.

[0099] As described above, the first lens holder 3A includes the first holding portion 31A, the first left bearing portion 32AL, and the first right bearing portion 32AR.

[0100] The first holding portion 31A has a first through hole RH1 through which the optical axis OA passes. The first through hole RH1 includes a first front through hole RHF1 and a first rear through hole RHB1. In the illustrated example, the first front through hole RHF1 is configured by a combination of a lower front U-shaped groove portion DCF that opens upward (Z1 direction) and an upper front U-shaped groove portion UCF that opens downward (Z2 direction). Specifically, the lower front U-shaped groove portion DCF and the upper front U-shaped groove portion UCF are arranged so as to be adjacent to each other in the front-rear direction (X-axis direction) and to be opposite to each other in the up-down direction. Similarly, the first rear through hole RHB1 is configured by a combination of a lower rear U-shaped groove portion DCB that opens upward (Z1 direction) and an upper rear U-shaped groove portion UCB that opens downward (Z2 direction). Specifically, the lower rear U-shaped groove portion DCB and the upper rear U-shaped groove portion UCB are disposed so as to be adjacent to each other in the front-rear direction (X-axis direction) and to face opposite directions to each other in the up-down direction.

[0101] The first left bearing portion 32AL has a first through hole TH1 through which the shaft 5AX of the first shaft member 5A passes. The first through hole TH1 includes a first front through hole THF1 and a first rear through hole THB1. In the illustrated example, the first front through hole THF1 is configured by a combination of a lower front U-shaped groove portion DLF that opens upward (Z1 direction) and an upper front U-shaped groove portion ULF that opens downward (Z2 direction). Specifically, the lower front U-shaped groove portion DLF and the upper front U-shaped groove portion ULF are arranged so as to be adjacent to each other in the front-rear direction (X-axis direction) and to be opposite to each other in the up-down direction. Similarly, the first rear through hole THB1 is configured by a combination of a lower rear U-shaped groove portion DLB that opens upward (Z1 direction) and an upper rear U-shaped groove portion ULB that opens downward (Z2 direction). Specifically, the lower rear U-shaped groove portion DLB and the upper rear U-shaped groove portion ULB are disposed so as to be adjacent to each other in the front-rear direction (X-axis direction) and to face opposite directions to each other in the up-down direction.

[0102] The first right bearing portion 32AR also has a first semicircular cutout CT1 through which the shaft 5BX of the second shaft member 5B passes. In the illustrated example, the first semicircular cutout CT1 is configured by a combination of an upper front L-shaped groove portion URF and an upper rear L-shaped groove portion URB that open downward (Z2 direction) and rightward (Y2 direction), and a lower L-shaped groove portion DR that opens upward (Z1 direction) and rightward (Y2 direction). Specifically, the upper front L-shaped groove portion URF and the lower L-shaped groove portion DR are arranged to be aligned in the front-rear direction (X-axis direction). Similarly, the lower L-shaped groove portion DR and the upper rear L-shaped groove portion URB are arranged to be aligned in the front-rear direction (X-axis direction).

[0103] In this way, the first front through-hole THF1 and the first rear through-hole THB1 are each configured by a combination of a pair of U-shaped groove portions, and the first semicircular cutout CT1 is configured by a combination of a pair of L-shaped groove portions, so that the first lens holder 3A can be manufactured by injection molding using a pair of molds (upper and lower molds) that do not include a slide core and are separated in the vertical direction. Therefore, this configuration brings about the effect of reducing the manufacturing cost of the lens holder driving device 101.

[0104] As described above, the lens holder driving device 101 according to an embodiment of the present invention, as shown in Figures 3 and 4, comprises a fixed side member FB (base member 2), a first lens holder 3A capable of holding a first lens body LS1, a second lens holder 3B capable of holding a second lens body LS2 arranged to have the same optical axis OA as the first lens body LS1, a first shaft member 5A and a second shaft member 5B attached to the fixed side member FB (base member 2) and capable of guiding movement of the first lens holder 3A and the second lens holder 3B in the optical axis direction relative to the fixed side member FB (base member 2), a first piezoelectric driving unit PD1 having a first piezoelectric element 8A and moving the first lens holder 3A along the optical axis direction by movement (circular motion) of the first piezoelectric element 8A, and a second piezoelectric driving unit PD2 having a second piezoelectric element 8B and moving the second lens holder 3B along the optical axis direction by movement (circular motion) of the second piezoelectric element 8B. The first lens holder 3A has a portion (first left bearing portion 32AL) close to the first shaft member 5A and a portion (first right bearing portion 32AR) close to the second shaft member 5B, and the first piezoelectric driving portion PD1 is disposed in the portion (first left bearing portion 32AL) close to the first shaft member 5A in the first lens holder 3A and is in contact with the first shaft member 5A. 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, and the second piezoelectric driving portion PD2 is disposed in the portion (second right bearing portion 32BR) close to the second shaft member 5B in the second lens holder 3B and is in contact with the second shaft member 5B.

[0105] This configuration has the effect of suppressing the movement of the first piezoelectric drive unit PD1 and the movement of the second piezoelectric drive unit PD2 from interfering with each other through the same shaft member 5 when the first lens holder 3A and the second lens holder 3B are moved simultaneously in the optical axis direction. This is because the first piezoelectric drive unit PD1 is configured to contact the first shaft member 5A, whereas the second piezoelectric drive unit PD2 is configured to contact the second shaft member 5B. Therefore, this configuration can move the first lens holder 3A and the second lens holder 3B simultaneously and stably. In this case, the movement directions of the first lens holder 3A and the second lens holder 3B may be the same direction or opposite directions.

[0106] In the above embodiment, the pair of lens holders 3 (the first lens holder 3A and the second lens holder 3B) are configured as identical parts having the same shape and size. The same is true for the movable magnet 4, the shaft member 5, the magnetic sensor 6, the piezoelectric element 8, the contact member 9, the circuit board 10, the fixed magnet 11, the magnetic member 12, the biasing member 13, the metal member 14, and the synthetic resin member 15.

[0107] This configuration brings about the effect that the number of parts of the lens holder driving device 101 can be reduced.

[0108] 4, the first piezoelectric element 8A may extend in a direction intersecting with the direction (X-axis direction) of the axis (axis 5AX) of the first shaft member 5A. The second piezoelectric element 8B may extend in a direction intersecting with the direction (axis 5BX) of the axis of the second shaft member 5B.

[0109] This configuration provides the effect that the shaft member 5 and the piezoelectric driving section PD can be reliably contacted even when the shaft member 5 has a cylindrical shape. Specifically, this configuration provides the effect that the first shaft member 5A and the first piezoelectric driving section PD1 can be reliably contacted, and the second shaft member 5B and the second piezoelectric driving section PD2 can be reliably contacted. In the illustrated example, the piezoelectric element 8 is configured to extend in a direction (Z-axis direction) perpendicular to the axial direction (X-axis direction) of the shaft member 5, but may be configured to extend in a direction intersecting the axial direction (X-axis direction) of the shaft member 5 at an angle other than 90 degrees. This is to reduce the length (height) of the piezoelectric element 8 in the Z-axis direction to reduce the length (height) of the lens holder driving device 101 in the Z-axis direction.

[0110] 4, a first biasing member 13A that biases the first piezoelectric driving unit PD1 toward the first shaft member 5A may be provided in the first lens holder 3A. Also, a second biasing member 13B that biases the second piezoelectric driving unit PD2 toward the second shaft member 5B may be provided in the second lens holder 3B.

[0111] This configuration provides the effect of reliably transmitting the movement (circular movement) of the piezoelectric element 8 to the shaft member 5. Specifically, this configuration provides the effect of reliably transmitting the movement of the first piezoelectric element 8A to the first shaft member 5A and reliably transmitting the movement of the second piezoelectric element 8B to the second shaft member 5B while suppressing mutual interference between the movement of the first piezoelectric element 8A and the movement of the second piezoelectric element 8B.

[0112] Furthermore, in the above-described embodiment, as shown in Figures 6A and 6B, the first biasing member 13A may be composed of a plate-shaped metal member such as a leaf spring, and may have a first fixed portion (front fixed portion 13FF and rear fixed portion 13FB) fixed to the first lens holder 3A, two first support portions (upper support portion 13SU and lower support portion 13SD) supporting two spaced apart locations (first node ND1 and second node ND2) on one surface side (Y1 side) of the first piezoelectric driving portion PD1, and two elastically deformable first elastic deformation portions (upper elastic deformation portion 13EU and lower elastic deformation portion 13ED) provided between the first fixed portion (front fixed portion 13FF and rear fixed portion 13FB) and each of the two first support portions (upper support portion 13SU and lower support portion 13SD). In this case, as shown in FIG. 6A, the other surface side (Y2 side) of the first piezoelectric driving part PD1 (first contact member 9A) may be in contact with the first shaft member 5A between the two first support parts (upper support part 13SU and lower support part 13SD). Similarly, as shown in FIG. 5, the second biasing member 13B may be composed of a plate-shaped metal member such as a leaf spring, and may have a second fixed portion (front fixed portion 13FF and rear fixed portion 13FB) fixed to the second lens holder 3B, two second support portions (upper support portion 13SU and lower support portion 13SD) supporting two spaced apart locations on one surface side (Y2 side) of the second piezoelectric driving portion PD2, and two elastically deformable second elastic deformation portions (upper elastic deformation portion 13EU and lower elastic deformation portion 13ED) provided between the second fixed portion (front fixed portion 13FF and rear fixed portion 13FB) and each of the two second support portions (upper support portion 13SU and lower support portion 13SD). In this case, the other surface side (Y1 side) of the second piezoelectric drive part PD2 (second contact member 9B) may be in contact with the second shaft member 5B between the two second support parts (upper support part 13SU and lower support part 13SD).

[0113] This configuration has the effect of suppressing the movement (circular movement) of the piezoelectric element 8 from being hindered by the biasing member 13. This is because, in this configuration, the vicinity of each of the two nodes of the piezoelectric element 8 that vibrates (circular movement) with two nodes is supported by the biasing member 13.

[0114] Furthermore, in the above-described embodiment, as shown in FIG. 4, the first piezoelectric driving unit PD1 may be arranged on the outside (Y1 side) of the first axial member 5A away from the second axial member 5B, and the second piezoelectric driving unit PD2 may be arranged on the outside (Y2 side) of the second axial member 5B away from the first axial member 5A.

[0115] This configuration brings about the effect of improving the productivity of the lens holder driving device 101. This is because the piezoelectric driving unit PD can be attached to the lens holder 3 more easily than when the piezoelectric driving unit PD is disposed inside the shaft member 5.

[0116] In the above-described embodiment, as shown in FIG. 4, the first lens holder 3A may be provided with a first magnet (first movable magnet 4A). In this case, the fixed side member FB (base member 2) may be provided with a first magnetic member that applies an attractive force in a direction intersecting the optical axis direction (Z-axis direction) between the fixed side member FB (base member 2) and the first magnet (first movable magnet 4A) over the entire moving range of the first lens holder 3A. In addition, as shown in FIG. 4, the second lens holder 3B may be provided with a second magnet (second movable magnet 4B). In this case, the fixed side member FB (base member 2) may be provided with a second magnetic member that applies an attractive force in a direction intersecting the optical axis direction (Z-axis direction) between the fixed side member FB (base member 2) and the second magnet (second movable magnet 4B) over the entire moving range of the second lens holder 3B. In the illustrated example, the first magnetic member is the second shaft member 5B and the second magnetic member is the first shaft member 5A, but the first magnetic member may be a member (not shown) other than the second shaft member 5B, and the second magnetic member may be a member (not shown) other than the first shaft member 5A.

[0117] This configuration has the effect of suppressing rattling of the lens holder 3. In the example shown in FIG. 8B, the magnetic attraction force acting between the first movable magnet 4A and the first magnetic member produces a torque (biasing torque TQ represented by a dashed arrow) that rotates the first lens holder 3A around the axis line (axis 5AX) of the first shaft member 5A. The biasing torque TQ acts to press the first right bearing portion 32AR of the first lens holder 3A from the upper side (Z1 side) against the second shaft member 5B. In addition to the biasing torque TQ, a torque (weight torque) that causes the weight of the first lens holder 3A to rotate the first lens holder 3A around the axis line (axis 5AX) of the first shaft member 5A acts on the first lens holder 3A. The first movable magnet 4A is configured so that the magnitude of the biasing torque TQ produced by the attraction force is greater than the magnitude of the weight torque. Therefore, no matter what posture the lens holder driving device 101 takes (even if it is upside down), the composite torque obtained by combining the biasing torque TQ and the weight torque always acts to press the first right bearing portion 32AR of the first lens holder 3A against the second shaft member 5B from the Z1 side. That is, 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 the opposite directions, the composite torque always acts to press the first right bearing portion 32AR of the first lens holder 3A against the second shaft member 5B from the Z1 side. As a result, no matter what posture the lens holder driving device 101 takes (even if it is upside down), the first right bearing portion 32AR of the first lens holder 3A and the second shaft member 5B are always maintained in contact with each other, and the occurrence of rattle between the first right bearing portion 32AR and the second shaft member 5B is suppressed. The same is true for the rattle between the first left bearing portion 32AL of the first lens holder 3A and the first shaft member 5A, the rattle between the second left bearing portion 32BL of the second lens holder 3B and the first shaft member 5A, and the rattle between the second right bearing portion 32BR of the second lens holder 3B and the second shaft member 5B. This configuration also brings about the effect of improving the drop impact resistance of the lens holder driving device 101.

[0118] Furthermore, the first magnetic member that exerts an attractive force between itself and the first magnet (first movable magnet 4A) in a direction intersecting the optical axis direction may be either the first shaft member 5A or the second shaft member 5B. Similarly, the second magnetic member that exerts an attractive force between itself and the second magnet (second movable magnet 4B) in a direction intersecting the optical axis direction may be either the first shaft member 5A or the second shaft member 5B.

[0119] In the above-described embodiment, as shown in FIG. 4, the first magnet (first movable magnet 4A) may be fixed to a portion (first right bearing portion 32AR) of the first lens holder 3A close to the second shaft member 5B. In this case, the first magnetic member may be the second shaft member 5B. In addition, the second magnet (second movable magnet 4B) may be fixed to a portion (second left bearing portion 32BL) of the second lens holder 3B close to the first shaft member 5A. In this case, the second magnetic member may be the first shaft member 5A.

[0120] This configuration has the advantage that it is not necessary to provide a magnetic member that generates an attractive force between the movable magnet 4 and the shaft member 5 separately. Therefore, this configuration has the advantage that the manufacturing cost of the lens holder driving device 101 can be reduced.

[0121] When the first magnetic member is the first shaft member 5A, the first magnet (first movable magnet 4A) is preferably disposed in a portion of the first lens holder 3A close to the first shaft member 5A. When the second magnetic member is the second shaft member 5B, the second magnet (second movable magnet 4B) is preferably disposed in a portion of the second lens holder 3B close to the second shaft member 5B.

[0122] In the above-described embodiment, as shown in Fig. 4, the first piezoelectric driving unit PD1 may have a first contact member 9A made of metal that contacts the first shaft member 5A. The second piezoelectric driving unit PD2 may have a second contact member 9B made of metal that contacts the second shaft member 5B. In this case, the first shaft member 5A and the second shaft member 5B may be made of a metal harder than the first contact member 9A and the second contact member 9B.

[0123] This configuration has the effect of suppressing wear of the shaft member 5 and the contact member 9. In particular, this configuration has the effect of suppressing wear of the shaft member 5, since the shaft member 5 is made of a metal harder than the contact member 9. This configuration also has the effect of suppressing the generation of wear powder due to contact between the shaft member 5 and the contact member 9, and therefore has the effect of suppressing the wear powder from reaching the image sensor IS.

[0124] In the above embodiment, as shown in Fig. 11A and Fig. 11B, the portion of the first lens holder 3A close to the first shaft member 5A (first left bearing portion 32AL) may have a first front wall portion FW1 in which a first front through hole THF1 through which the first shaft member 5A is inserted is formed, and a first rear wall portion BW1 in which a first rear through hole THB1 through which the first shaft member 5A is inserted is formed. In this case, the first piezoelectric driving portion PD1 may be disposed inside a first space SP1 between the first front wall portion FW1 and the first rear wall portion BW1. The first space SP1 may be covered by a first cover member CV1 (see Fig. 4) attached to the portion of the first lens holder 3A close to the first shaft member 5A (first left bearing portion 32AL).

[0125] Similarly, as shown in Fig. 4, the portion of the second lens holder 3B close to the second shaft member 5B (the second right bearing portion 32BR) may have a second front wall portion FW2 in which a second front through hole THF2 through which the second shaft member 5B is inserted is formed, and a second rear wall portion BW2 in which a second rear through hole THB2 through which the second shaft member 5B is inserted is formed. In this case, the second piezoelectric driving portion PD2 may be disposed inside a second space SP2 between the second front wall portion FW2 and the second rear wall portion BW2. The second space SP2 may be covered by a second cover member CV2 attached to the portion of the second lens holder 3B close to the second shaft member 5B (the second right bearing portion 32BR).

[0126] This configuration provides the effect of confining wear powder generated by contact between the shaft member 5 and the contact member 9 in a sealed space. Specifically, this configuration provides the effect of confining wear powder generated by contact between the first shaft member 5A and the first contact member 9A in a first space SP1 surrounded by the first left bearing portion 32AL (first front wall portion FW1 and first rear wall portion BW1) and the first cover member CV1, and confining wear powder generated by contact between the second shaft member 5B and the second contact member 9B in a second space SP2 surrounded by the second right bearing portion 32BR (second front wall portion FW2 and second rear wall portion BW2) and the second cover member CV2.

[0127] In the above embodiment, as shown in FIG. 3, the fixed side member FB (base member 2) may be provided with a first magnetic field generating member MG1 and a second magnetic field generating member MG2. In this case, as shown in FIG. 8B, the first magnetic field generating member MG1 may be disposed so as to face a portion (first left bearing portion 32AL) of the first lens holder 3A close to the first shaft member 5A. A first magnetic sensor 6A that detects a magnetic field from the first magnetic field generating member MG1 may be disposed in the portion (first left bearing portion 32AL) of the first lens holder 3A close to the first shaft member 5A. The second magnetic field generating member MG2 may be disposed so as to face a portion (second right bearing portion 32BR) of the second lens holder 3B close to the second shaft member 5B. A second magnetic sensor 6B that detects a magnetic field from the second magnetic field generating member MG2 may be disposed in the portion (second right bearing portion 32BR) of the second lens holder 3B close to the second shaft member 5B.

[0128] This configuration has the advantage of being able to suppress magnetic interference between the first magnetic field generating member MG1 and the second magnetic field generating member MG2 because the first magnetic field generating member MG1 and the second magnetic field generating member MG2 are provided at positions spaced apart from each other, and therefore has the advantage of being able to more accurately detect the movements of the first lens holder 3A and the second lens holder 3B.

[0129] In the above-described embodiment, the first magnetic field generating member MG1 and the second magnetic field generating member MG2 may overlap each other partially in the optical axis direction as shown in Fig. 8A. In the illustrated example, the first magnetic field generating member MG1 has a length (width) in the optical axis direction of width WD1, and the second magnetic field generating member MG2 has a length (width) in the optical axis direction of width WD2. The first magnetic field generating member MG1 and the second magnetic field generating member MG2 overlap each other over a distance DS in the optical axis direction.

[0130] This configuration brings about the effect that the sum of the length of the movement range of the first lens holder 3A and the length of the movement range of the second lens holder 3B can be set to be greater than the length dimension in the optical axis direction of the lens holder driving device 101. Therefore, this configuration brings about the effect that the lens holder driving device 101 can be made smaller and lighter while realizing the desired movement ranges for each of the first movable side member MB1 and the second movable side member MB2.

[0131] In the above-described embodiment, the first lens holder 3A may have a plurality of through holes (first front through hole RHF1, first rear through hole RHB1, first front through hole THF1, and first rear through hole THB1) penetrating in the optical axis direction, as shown in Fig. 11A and Fig. 11B. The first front through hole RHF1 may be configured by a combination of a first groove portion (lower front U-shaped groove portion DCF) that opens upward and a second groove portion (upper front U-shaped groove portion UCF) that opens downward, and the first rear through hole RHB1 may be configured by a combination of a first groove portion (lower rear U-shaped groove portion DCB) that opens upward and a second groove portion (upper rear U-shaped groove portion UCB) that opens downward. The first front through hole THF1 may be formed by a combination of a first groove portion (lower front U-shaped groove portion DLF) that opens upward and a second groove portion (upper front U-shaped groove portion ULF) that opens downward, and the first rear through hole THB1 may be formed by a combination of a first groove portion (lower rear U-shaped groove portion DLB) that opens upward and a second groove portion (upper rear U-shaped groove portion ULB) that opens downward. The same applies to the multiple through holes (second front through hole RHF2, second rear through hole RHB2, second front through hole THF2, and second rear through hole THB2) formed in the second lens holder 3B shown in FIG. 4. The same applies to the first semicircular cutout CT1 formed in the first lens holder 3A shown in FIG. 11A and FIG. 11B, and the second semicircular cutout CT2 formed in the second lens holder 3B shown in FIG. 4.

[0132] This configuration brings about an effect of reducing the manufacturing cost of the lens holder driving device 101. Because the first front through hole THF1 and the first rear through hole THB1 are each composed of a pair of U-shaped grooves and the first semicircular cutout CT1 is composed of a pair of L-shaped grooves, the first lens holder 3A can be manufactured by injection molding using a pair of dies (upper and lower dies) that do not include a slide core and are separated in the vertical direction. Similarly, because the second front through hole THF2 and the second rear through hole THB2 are each composed of a pair of U-shaped grooves and the second semicircular cutout CT2 is composed of a pair of L-shaped grooves, the second lens holder 3B can be manufactured by injection molding using a pair of dies (upper and lower dies) that do not include a slide core and are separated in the vertical direction. In the illustrated example, the first lens holder 3A and the second lens holder 3B have the same shape and size, and are therefore molded by the same set of dies.

[0133] 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, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical contradiction.

[0134] For example, in the above-described embodiment, the first through hole TH1 is configured by a combination of two U-shaped groove portions as shown in Figures 11A and 11B, but at least one of the U-shaped groove portions may be a V-shaped groove portion. The same applies to the first through hole RH1 (see Figures 11A and 11B), the second through hole TH2 (see Figure 4), and the second through hole RH2 (see Figure 4).

[0135] In the above embodiment, the first movable magnet 4A is fixed to a portion of the first lens holder 3A close to the second shaft member 5B, but it may be fixed to both a portion close to the first shaft member 5A and a portion close to the second shaft member 5B. The same applies to the second movable magnet 4B. The first movable magnet 4A may be fixed to a portion of the first lens holder 3A close to the second shaft member 5B, and the second movable magnet 4B may be fixed to a portion of the second lens holder 3B close to the second shaft member 5B. [Explanation of symbols]

[0136] 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 2G Groove portion 2S Storage portion 2T Notch 3 Lens holder 3A First lens holder 3B Second lens holder 4 Moving magnet 4A First moving magnet 4B Second moving magnet 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 8 Piezoelectric element DESCRIPTION OF THE REFERENCE NUMERALS 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 10F...Adhesive fixing part 10P...Piezoelectric element fixing part 10S...Sensor fixing part 10T...Terminal part 10W...Curved part 11...Fixed magnet 11A...First fixed magnet 11B...Second fixed magnet 12...Magnetic member 12A...First magnetic member 12AD...First lower magnetic member 12AU...First upper magnetic member 12B...Second magnetic member 12BD...Second lower magnetic member 12BU...Second upper magnetic member 13... Urging member 13A... First urging member 13B... Second urging member 13E... Elastic deformation portion 13ED... Lower elastic deformation portion 13EU... Upper elastic deformation portion 13F... Fixed portion 13FB... Rear fixed portion 13FF... Front fixed portion 13S... Support portion 13SD... Lower support portion 13SU... Upper support portion 14... Metal member 14A... First metal member 14B... Second metal member 15... Synthetic resin member 15A... First synthetic resin member 15B... Second synthetic resin member 31... Holding portion 31A... First holding portion 31B... Second holding portion 32... Bearing portion 32A... First bearing portion 32AL···First left bearing portion 32AR···First right bearing portion 32B···Second bearing portion 32BL···Second left bearing portion 32BR···Second right bearing portion 32L···Left bearing portion 32R···Right bearing portion 101···Lens holder driving device AB, AF···Contact portion BE···Inner edge portion BP···Rod-shaped portionBPD···Lower rod-shaped part BPU···Upper rod-shaped part BW1···First rear wall part BW2···Second rear wall part CM···Camera module CT1···First semicircular cutout CT2···Second semicircular cutout CV···Cover part CV1···First cover part CV2···Second cover part DB···Lower bent part DCB···Lower rear U-shaped groove part DCF···Lower front U-shaped groove part DLB···Lower rear U-shaped groove part DLF···Lower front U-shaped groove part DR···Lower L-shaped groove part DT···Position detection mechanism DT1···First position detection mechanism DT2···Second position detection mechanism FB··Fixed side part FW1···First front wall part FW2···Second front wall part GP···Spacing HS···Housing IS...Image sensor L1~L4...Spacing LM...Lower member LS...Lens body LS1...First lens body LS2...Second lens body LT...Light M1~M6...Width MB...Movable member MB1...First movable member MB2...Second movable member MG...Magnetic field generating member MG1...First magnetic field generating member MG2...Second magnetic field generating member MR...Mirror N1~N5...Spacing ND...Node ND1...First node ND2...Second node OA...Optical axis OP1, OP2...Through hole PD...Piezoelectric actuator PD1...First piezoelectric actuator PD2...Second piezoelectric actuator PR...Protrusion PR1D...First lower protrusion PR1U...First upper protrusion PR2D...Second lower protrusion PR2U...Second upper protrusion PR3D...Third lower protrusion PR3U...Third upper protrusion RH1...First through hole RH2...Second through hole RHB1...First rear through hole RHB2...Second rear through hole RHF1...First front through hole RHF2...Second front through hole RS...Concave SP1...First space SP2...Second space TH1...First through hole TH2...Second through hole THB1...First rear through hole THB2...Second rear through hole THF1...First front through hole THF2...Second front through hole TK...Thickness UB...Upper bent part UCB...Upper-rear U-shaped groove UCF...Upper-front U-shaped groove ULB...Upper-rear U-shaped groove ULF...Upper-front U-shaped groove URB...Upper-rear L-shaped groove URF...Upper-front L-shaped groove

Claims

1. A fixed member; a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body arranged to have the same optical axis as the first lens body; a first shaft member and a second shaft member provided on the fixed member and capable of guiding movement of the first lens holder and the second lens holder relative to the fixed member in an optical axis direction; a first piezoelectric driving unit having a first piezoelectric element and configured to move the first lens holder along an optical axis direction by movement of the first piezoelectric element; a second piezoelectric driving unit having a second piezoelectric element and moving the second lens holder along an optical axis direction by movement of the second 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 piezoelectric driving portion is disposed in a portion of the first lens holder close to the first shaft member and in contact with the first shaft member, the second lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the second piezoelectric driving portion is disposed in a portion of the second lens holder close to the second shaft member and in contact with the second shaft member, The first piezoelectric element extends in a direction intersecting with the axis of the first shaft member, The second piezoelectric element extends in a direction intersecting with the axis of the second shaft member, a first biasing member that biases the first piezoelectric driving portion toward the first shaft member is provided in the first lens holder, a second biasing member that biases the second piezoelectric driving portion toward the second shaft member is provided in the second lens holder, the first biasing member is made of a plate-shaped metal member and has a first fixed portion fixed to the first lens holder, two first support portions supporting two spaced apart locations on one surface side of the first piezoelectric driving portion, and two first elastic deformation portions provided between the first fixed portion and the two first support portions, respectively, and the other surface side of the first piezoelectric driving portion and the first shaft member are in contact between the two first support portions; the second biasing member is made of a plate-shaped metal member and has a second fixed portion fixed to the second lens holder, two second support portions supporting two spaced apart locations on one surface side of the second piezoelectric driving portion, and two second elastic deformation portions provided between the second fixed portion and each of the two second support portions, and the other surface side of the second piezoelectric driving portion and the second shaft member are in contact between the two second support portions.

4. A lens holder driving device comprising:

2. A fixed side member, a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body arranged to have the same optical axis as the first lens body; a first shaft member and a second shaft member provided on the fixed member and capable of guiding movement of the first lens holder and the second lens holder relative to the fixed member in an optical axis direction; a first piezoelectric driving unit having a first piezoelectric element and configured to move the first lens holder along an optical axis direction by movement of the first piezoelectric element; a second piezoelectric driving unit having a second piezoelectric element and moving the second lens holder along an optical axis direction by movement of the second 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 piezoelectric driving portion is disposed in a portion of the first lens holder close to the first shaft member and in contact with the first shaft member, the second lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the second piezoelectric driving portion is disposed in a portion of the second lens holder close to the second shaft member and in contact with the second shaft member, the first piezoelectric driving portion is disposed outside the first shaft member away from the second shaft member, The second piezoelectric driving portion is disposed outside the second shaft member away from the first shaft member.

4. A lens holder driving device comprising:

3. The first lens holder is provided with a first magnet, the fixed member is provided with a first magnetic member that exerts an attractive force between the fixed member and the first magnet in a direction intersecting with an optical axis direction over an entire range of movement of the first lens holder, The second lens holder is provided with a second magnet, a second magnetic member that applies an attractive force between the fixed member and the second magnet over the entire moving range of the second lens holder in a direction intersecting with the optical axis direction; 3. The lens holder driving device according to claim 1 or 2.

4. the first magnetic member is constituted by the first shaft member or the second shaft member, The second magnetic member is composed of the first shaft member or the second shaft member.

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

5. A fixed side member, a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body arranged to have the same optical axis as the first lens body; a first shaft member and a second shaft member provided on the fixed member and capable of guiding movement of the first lens holder and the second lens holder relative to the fixed member in an optical axis direction; a first piezoelectric driving unit having a first piezoelectric element and configured to move the first lens holder along an optical axis direction by movement of the first piezoelectric element; a second piezoelectric driving unit having a second piezoelectric element and moving the second lens holder along an optical axis direction by movement of the second 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 piezoelectric driving portion is disposed in a portion of the first lens holder close to the first shaft member and in contact with the first shaft member, the second lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the second piezoelectric driving portion is disposed in a portion of the second lens holder close to the second shaft member and in contact with the second shaft member, The first lens holder is provided with a first magnet, the fixed member is provided with a first magnetic member that exerts an attractive force between the fixed member and the first magnet in a direction intersecting with an optical axis direction over an entire range of movement of the first lens holder, The second lens holder is provided with a second magnet, the fixed member is provided with a second magnetic member that exerts an attractive force between the fixed member and the second magnet in a direction intersecting with the optical axis direction over the entire moving range of the second lens holder, the first magnet is fixed to a portion of the first lens holder close to the second shaft member, the first magnetic member is the second shaft member, the second magnet is fixed to a portion of the second lens holder close to the first shaft member, The second magnetic member is the first shaft member.

4. A lens holder driving device comprising:

6. A fixed side member, a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body arranged to have the same optical axis as the first lens body; a first shaft member and a second shaft member provided on the fixed member and capable of guiding movement of the first lens holder and the second lens holder relative to the fixed member in an optical axis direction; a first piezoelectric driving unit having a first piezoelectric element and configured to move the first lens holder along an optical axis direction by movement of the first piezoelectric element; a second piezoelectric driving unit having a second piezoelectric element and moving the second lens holder along an optical axis direction by movement of the second 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 piezoelectric driving portion is disposed in a portion of the first lens holder close to the first shaft member and in contact with the first shaft member, the second lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the second piezoelectric driving portion is disposed in a portion of the second lens holder close to the second shaft member and in contact with the second shaft member, the first piezoelectric driving portion has a first contact member made of metal that contacts the first shaft member, the second piezoelectric driving portion has a second contact member made of metal that contacts the second shaft member, The first shaft member and the second shaft member are made of a metal harder than the first contact member and the second contact member.

4. A lens holder driving device comprising:

7. A fixed side member, a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body arranged to have the same optical axis as the first lens body; a first shaft member and a second shaft member provided on the fixed member and capable of guiding movement of the first lens holder and the second lens holder relative to the fixed member in an optical axis direction; a first piezoelectric driving unit having a first piezoelectric element and configured to move the first lens holder along an optical axis direction by movement of the first piezoelectric element; a second piezoelectric driving unit having a second piezoelectric element and moving the second lens holder along an optical axis direction by movement of the second 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 piezoelectric driving portion is disposed in a portion of the first lens holder close to the first shaft member and in contact with the first shaft member, the second lens holder has a portion close to the first shaft member and a portion close to the second shaft member, the second piezoelectric driving portion is disposed in a portion of the second lens holder close to the second shaft member and in contact with the second shaft member, a portion of the first lens holder close to the first shaft member includes a first front wall portion having a first front through hole through which the first shaft member is inserted, and a first rear wall portion having a first rear through hole through which the first shaft member is inserted, the first piezoelectric driving portion is disposed inside a first space between the first front wall portion and the first rear wall portion, the first space is covered by a first cover member attached to a portion of the first lens holder close to the first shaft member, a portion of the second lens holder close to the second shaft member includes a second front wall portion having a second front through hole through which the second shaft member is inserted, and a second rear wall portion having a second rear through hole through which the second shaft member is inserted, the second piezoelectric driving portion is disposed inside a second space between the second front wall portion and the second rear wall portion, the second space is covered by a second cover member attached to a portion of the second lens holder close to the second shaft member; 4. A lens holder driving device comprising:

8. The fixed member is provided with a first magnetic field generating member and a second magnetic field generating member, the first magnetic field generating member faces a portion of the first lens holder that is close to the first shaft member, a first magnetic sensor that detects a magnetic field from the first magnetic field generating member is provided in a portion of the first lens holder close to the first shaft member, the second magnetic field generating member faces a portion of the second lens holder that is close to the second shaft member, a second magnetic sensor that detects a magnetic field from the second magnetic field generating member is provided in a portion of the second lens holder that is close to the second shaft member; 8. The lens holder driving device according to claim 1.

9. The first magnetic field generating member and the second magnetic field generating member partially overlap each other in the optical axis direction.

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

10. each of the first lens holder and the second lens holder has a plurality of through holes extending therethrough 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.

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

Images