Lens holder driving device

Abstract

A lens holder driving device (101) is provided with: a first lens holder (3A) capable of holding a first lens body (LS1); a second lens holder (3B) capable of holding the second lens body (LS2); a first movable-side member (MB1) including a first lens holder (3A); a second movable side member (MB2) including a second lens holder (3B); a first piezoelectric drive unit (PD1) that moves the first lens holder (3A) in the optical axis direction by the movement of the first piezoelectric element (8A); and a second piezoelectric driving unit (PD2) that moves the second lens holder (3B) in the optical axis direction by the movement of the second piezoelectric element (8B). A second movable-side member (MB2) is included in the first movable-side member (MB1) and is movable in the optical axis direction with respect to the first lens holder (3A). A first piezoelectric drive unit (PD1) is provided on the fixed-side member (FB), and a second piezoelectric drive unit (PD2) is provided on the second movable-side member (MB2).

Description

Technical Field

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

[0002] Conventionally, there is known a lens driving device that can independently move a first movable portion that holds a first movable lens and a second movable portion that holds a second movable lens in the optical axis direction (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-105653 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the above-mentioned lens driving device, for example, since the first movable lens (zoom lens) and the second movable lens (focus lens) are independently moved in the optical axis direction, the time required for focusing may be longer when zooming in or zooming out.

[0008] Therefore, it is desirable to provide a lens holder driving device capable of moving two lens holders more efficiently.

[0009] Solutions for solving problems

[0010] The lens holder driving device of an embodiment of the present invention comprises: a fixed side component; a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body configured to have the same optical axis as the above-mentioned first lens body; a first movable side component including the above-mentioned first lens holder; a second movable side component including the above-mentioned second lens holder; a first piezoelectric driving unit, which is constructed to have a first piezoelectric element, and the above-mentioned first movable side component is moved in the optical axis direction by the movement of the above-mentioned first piezoelectric element; and a second piezoelectric driving unit, which is constructed to have a second piezoelectric element, and the above-mentioned second movable side component is moved in the optical axis direction by the movement of the above-mentioned second piezoelectric element, the above-mentioned second movable side component is included in the above-mentioned first movable side component and can be moved in the optical axis direction relative to the above-mentioned first lens holder, the above-mentioned first piezoelectric driving unit is provided on the above-mentioned fixed side component or the above-mentioned first lens holder, and the above-mentioned second piezoelectric driving unit is provided on the above-mentioned second movable side component or the above-mentioned first lens holder.

[0011] Effects of the Invention

[0012] The lens holder driving device described above can more efficiently move the two lens holders. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1A A perspective view of a lens holder driving device.

[0014] Figure 1B This is an exploded perspective view of the lens holder drive device.

[0015] Figure 2 A schematic diagram of a camera module.

[0016] Figure 3 This is an exploded perspective view of the lens holder driving device in a state where the cover member is removed.

[0017] Figure 4 It is an exploded perspective view of the first movable side member.

[0018] Figure 5A This is a perspective view of the first movable-side member supported by the shaft member.

[0019] Figure 5B FIG. 4 is a perspective view of the first lens holder driven by the first piezoelectric drive unit.

[0020] Figure 5C is a perspective view of the second lens holder driven by the second piezoelectric drive unit.

[0021] Fig. 6A This is a perspective view of a piezoelectric drive unit that is pressed against a shaft member by a biasing member.

[0022] Figure 6B It is an exploded perspective view of the force applying component and the piezoelectric driving unit.

[0023] Figure 7 It is a perspective view of a first force applying member assembled on a base member.

[0024] Figure 8 This is the front view of the lens holder.

[0025] Fig. 9 A diagram showing an example of the positional relationship among a magnetic sensor, a magnetic field generating component, and a circuit board. DETAILED DESCRIPTION

[0026] Hereinafter, a lens holder driving device 101 according to an embodiment of the present invention will be described with reference to the drawings. Figure 1A 3D is a perspective view of the lens holder driving device 101 . Figure 1B It is an exploded perspective view of the lens holder driving device 101 . Figure 21 is a schematic diagram of a camera module CM in a portable device with a camera on which the lens holder driving device 101 is mounted.

[0027] In the example shown in the figure, X1 represents one direction on the X-axis constituting a three-dimensional orthogonal coordinate system, and X2 represents another direction on the X-axis. Y1 represents one direction on the Y-axis constituting a three-dimensional orthogonal coordinate system, and Y2 represents another direction on the Y-axis. Z1 represents one direction on the Z-axis constituting a three-dimensional orthogonal coordinate system, and Z2 represents another direction on the Z-axis. Then, the X1 side of the lens holder driving device 101 corresponds to the front side (object 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. In addition, 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. In addition, 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 is true for the other figures.

[0028] 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.

[0029] The lens body LS is an example of an optical component, and is composed of one or more lenses. Typically, the lens body LS is a cylindrical lens barrel having at least one lens, and is configured such that its central axis is along the optical axis OA. In the example shown in the figure, the lens body LS has a first lens body LS1 including a zoom lens and a second lens body LS2 including a focusing lens.

[0030] The lens holder driving device 101 is configured to be able to drive the lens holder 101 by means of a piezoelectric driving unit PD (see Figure 4 ) to move the lens body LS along the optical axis direction. The optical axis direction includes the direction of the optical axis OA of the lens body LS and the direction parallel to the optical axis OA. Specifically, the lens holder driving device 101 can be respectively as follows: Figure 1B as well as Figure 2 The first lens body LS1 can be moved along the optical axis as indicated by the double arrow AR1 in the figure, and the second lens body LS2 can be moved along the optical axis as indicated by the double arrow AR2. That is, the lens holder driving device 101 can move the first lens body LS1 and the second lens body LS2 along the optical axis at the same time, and can move the second lens body LS2 along the optical axis relative to the first lens body LS1. In addition, 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).

[0031] like Figure 1A As shown, the housing HS is a part of the fixed side member FB, and includes a cover member 1 and a base member 2. Figure 1B As shown, the cover member 1 includes an upper cover member 1U, a rear cover member 1B, and a lower cover member 1D.

[0032] The cover member 1 is configured to cover a portion of the base member 2. In the example shown in the figure, the upper cover member 1U and the lower cover member 1D are formed of metal. However, the upper cover member 1U and the lower cover member 1D may also be formed of synthetic resin. The rear cover member 1B is a printed circuit board on which the imaging element IS is mounted.

[0033] like Figure 2 As shown, the lens holder driving device 101 is used in a camera module CM such as a periscope camera module. Figure 2 In the example shown, the camera module CM mainly includes a reflector MR, a lens body LS, a lens holder driving device 101, and an imaging element IS. The reflector MR may also be a prism. Figure 2 In the example shown, the reflector MR is configured to provide a flat reflective surface.

[0034] Typically, Figure 2 As shown, the lens holder driving device 101 is arranged at a position farther from the subject than the reflecting mirror MR, and is configured to allow the light LT from the subject reflected by the reflecting mirror MR to pass through the lens body LS and reach the imaging element IS.

[0035] Next, refer to Figure 3 , the internal structure of the lens holder driving device 101 is described. Figure 3 1 is an exploded perspective view of the lens holder driving device 101 with the cover member 1 removed. Specifically, Figure 3 The 3D diagram shows a perspective view of the base member 2 , the shaft member 5 , the outer circuit substrate 11 , the urging member 13 , the image pickup device holder HD, the fixed lens holder LH, the first movable-side member MB1 , and the piezoelectric drive unit PD.

[0036] The base member 2 is a member constituting a part of the housing HS. In the example shown in the figure, the base member 2 is formed of a synthetic resin, but may also be formed of a metal.

[0037] Specifically, the base member 2 has a substantially rectangular cylindrical outer wall portion 2A that defines the accommodating portion 2S. 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 are opposite to each other, and the second side plate portion 2A2 and the fourth side plate portion 2A4 are opposite to each other. In addition, the second side plate portion 2A2 and the fourth side plate portion 2A4 extend perpendicularly relative 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 relative to the second side plate portion 2A2 and the fourth side plate portion 2A4. The first side plate portion 2A1 has a first opening OP1 for receiving the light LT from the subject reflected by the reflector MR. Similarly, the third side plate portion 2A3 has a second opening OP2 for allowing the light LT to reach the imaging element IS. The cover member 1 is joined to the base member 2 by an adhesive or the like, and together with the base member 2, constitutes a housing HS.

[0038] In addition, if Figure 3 As shown, the base member 2 is equipped with a first force member 13A, an image pickup element holder HD configured to hold an image pickup element IS, and a fixed lens holder LH configured to hold a fixed lens FL. The fixed lens FL is also called a front lens. The fixed lens holder LH is mounted in the first opening OP1, and the image pickup element holder HD is mounted outside the second opening OP2. In addition, the first movable side member MB1 and the outer circuit substrate 11 are accommodated in the accommodating portion 2S of the base member 2.

[0039] The shaft member 5 includes a first shaft member 5A having an axis (first axis 5AX) parallel to the optical axis OA and a second shaft member 5B having an axis (second 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 example shown in the figure, the shaft member 5 is configured such that one end is inserted into the through hole 2T (see FIG. 2 ) formed in the first side plate portion 2A1 of the base member 2. Figure 3 ), and the other end is embedded in the recess 2R formed on the inner surface of the third side plate portion 2A3 of the base member 2. However, the shaft member 5 can also be configured such that one end is embedded in the recess formed on the inner surface of the first side plate portion 2A1 of the base member 2, and the other end is inserted into the through hole formed in the third side plate portion 2A3 of the base member 2. In addition, the shaft member 5 can also be fixed to the base member 2 (the first side plate portion 2A1 and the third side plate portion 2A3) by an adhesive. In addition, the first shaft member 5A and the second shaft member 5B can also be formed of a magnetic metal.

[0040] The piezoelectric drive unit PD is configured to receive a supply of electric power so as to enable the lens holder 3 to move relative to the base member 2 in the optical axis direction. In the example shown in the figure, the piezoelectric drive unit PD includes a first piezoelectric drive unit PD1 that moves the first movable side member MB1 relative to the base member 2 in the optical axis direction and a second piezoelectric drive unit PD2 that moves the second movable side member MB2 relative to the first lens holder 3A in the optical axis direction. Specifically, the piezoelectric drive unit PD is configured to operate according to an applied voltage (voltage applied to the piezoelectric element 8) controlled by a drive circuit. The drive circuit can be mounted on the outer circuit substrate 11 or configured outside the housing HS. In the example shown in the figure, the drive circuit is configured outside the housing HS.

[0041] The first movable side component MB1 includes a first lens holder 3A, a movable side shaft component 7, a first lens body LS1 and a second movable side component MB2. The second movable side component MB2 constitutes a part of the first movable side component MB1. Specifically, the second movable side component MB2 includes a second lens holder 3B, a second lens body LS2 and a second force-applying component 13B. The first movable side component MB1 is configured to move in the optical axis direction through the first piezoelectric drive unit PD1 while being guided by the first shaft component 5A and the second shaft component 5B. The second movable side component MB2 is configured to move in the optical axis direction through the second piezoelectric drive unit PD2 while being guided by the first shaft component 5A.

[0042] Here, refer to Figure 4 as well as Figure 5A to Figure 5C , the details of the first movable side member MB1 will be described. Figure 4 FIG. 1 is an exploded perspective view of the first movable side member MB1. Figure 4 In the figure, for the sake of clarity, dashed arrows are used to indicate the relationship of one component being assembled to another component. Figure 4 In FIG. 1 , the components constituting the first movable-side member MB1 are surrounded by a single-dot chain line, and the components constituting the second movable-side member MB2 are surrounded by a double-dot chain line. Figure 5A It is a perspective view of the first movable-side member MB1 supported by the shaft member 5 . Figure 5B 3A is a perspective view of the first lens holder 3A driven by the first piezoelectric driver PD1. Figure 5C 3B is a perspective view of the second lens holder 3B driven by the second piezoelectric driver PD2.

[0043] The first lens holder 3A is a component formed by injection molding a synthetic resin such as a liquid crystal polymer (LCP). Figure 4As shown, the first lens holder 3A has a first holding portion 31A for holding the first lens body LS1 and a first bearing portion 32A for receiving the shaft member. Then, the first bearing portion 32A has a first left bearing portion 32AL for receiving the first shaft member 5A and a first right bearing portion 32AR for receiving the second shaft member 5B and the movable side shaft member 7.

[0044] The second lens holder 3B is a component formed by injection molding a synthetic resin such as a liquid crystal polymer (LCP). Figure 4 As shown, the second lens holder 3B has a second holding portion 31B for holding the second lens body LS2 and a second bearing portion 32B for receiving the shaft member. Then, the second bearing portion 32B has a second left bearing portion 32BL for receiving the first shaft member 5A and a second right bearing portion 32BR for receiving the movable side shaft member 7.

[0045] More specifically, the first right bearing portion 32AR has a first through hole TH1 capable of receiving the second shaft member 5B, two first grooves CT1 approximately in a semicircular shape opening to the right (Y2 direction), and three second grooves CT2 approximately in a semicircular shape opening to the right (Y2 direction) capable of receiving the movable side shaft member 7. The first left bearing portion 32AL has a third groove CT3 approximately in a semicircular shape opening to the left (Y1 direction) capable of receiving the first shaft member 5A. The second right bearing portion 32BR has two fourth grooves CT4 approximately in a V shape opening to the right (Y2 direction) capable of receiving the movable side shaft member 7. The second left bearing portion 32BL has a fifth groove CT5 approximately in a semicircular shape opening to the left (Y1 direction) capable of receiving the first shaft member 5A.

[0046] The second left bearing portion 32BL of the second lens holder 3B is equipped with a magnet 4. The magnet 4 is a member arranged to suppress the rattling of the second lens holder 3B at the first shaft member 5A.

[0047] The magnet 4 is configured to press a part of the second left bearing portion 32BL of the second lens holder 3B against the upper surface of the first shaft member 5A from above by the magnetic attraction force acting between the magnet 4 and the first shaft member 5A.

[0048] In addition, if Figure 5A As shown, at least a portion of the second right bearing portion 32BR of the second lens holder 3B is arranged in a space formed by the first right bearing portion 32AR of the first lens holder 3A. Therefore, a third opening OP3 (see FIG. 1 ) penetrating in the Y-axis direction is formed in the first right bearing portion 32AR. Figure 4 . ).

[0049] Next, refer to Fig. 6A as well as Figure 6B, the piezoelectric driving unit PD is explained. Fig. 6A 1 is a perspective view of the piezoelectric drive unit PD pressed against the movable side shaft member 7 by the force applying member 13. Figure 6B It is an exploded perspective view of the urging member 13 and the piezoelectric driving unit PD.

[0050] The piezoelectric drive unit PD is configured to move the lens holder 3 along the optical axis. In this embodiment, the piezoelectric drive unit PD is an example of a friction drive unit using a drive system disclosed in US Pat. No. 7,786,648, and includes a piezoelectric element 8, a contact member 9, and a circuit board 10.

[0051] The piezoelectric drive unit PD is configured to be urged inward (in a direction close to the optical axis OA) by the urging member 13 and pressed against the movable side shaft member 7 as the receiving member RV. In the example shown in the figure, the urging member 13 for pressing the piezoelectric drive unit PD against the receiving member RV is formed of a metal plate and is configured to form two nodes ND (see FIG. 1 ) formed when the piezoelectric element 8 is subjected to bending vibration (circular motion described later). Figure 6B ) are in contact with the circuit board 10 mounted on the outer side (the side away from the optical axis OA) of the piezoelectric element 8. The urging member 13 and the piezoelectric driving unit PD are joined by, for example, an adhesive.

[0052] Specifically, the piezoelectric drive unit PD includes a first piezoelectric drive unit PD1 that moves the first lens holder 3A along the optical axis relative to the base member 2, and a second piezoelectric drive unit PD2 that moves the second lens holder 3B along the optical axis relative to the first lens holder 3A. Then, the first piezoelectric drive unit PD1 includes a first piezoelectric element 8A, a first contact member 9A, and a first circuit substrate 10A, and the second piezoelectric drive unit PD2 includes a second piezoelectric element 8B, a second contact member 9B, and a second circuit substrate 10B.

[0053] The force applying member 13 includes a first force applying member 13A and a second force applying member 13B. Figure 3 as well as Figure 7 The second urging member 13B is mounted on the base member 2 as shown in FIG. Figure 4 As shown, it is mounted on the second lens holder 3B and is configured to be able to press the second piezoelectric drive unit PD2 against the second receiving member RV2.

[0054] The movable side shaft member 7 is a shaft member fixed to the first lens holder 3A and is configured to function as a receiving member RV (a first receiving member RV1 and a second receiving member RV2). The movable side shaft member 7 is fixed to three second grooves CT2 provided in the first right bearing portion 32AR of the first lens holder 3A by an adhesive.

[0055] like Figure 6B As shown, the first piezoelectric element 8A extends in the Z-axis direction which is a direction orthogonal to the optical axis direction (X-axis direction) (a direction perpendicular to the optical axis OA), and is constructed to be able to realize bending vibration (circular motion) with two nodes ND. That is, when bending vibration is performed, the parts of the two nodes ND hardly vibrate. Specifically, the first piezoelectric element 8A has a two-layer structure stacked in the Y-axis direction, wherein the two-layer structure is composed of a first layer that realizes the first bending vibration on the XZ plane and a second layer that realizes the second bending vibration on the YZ plane. The first piezoelectric drive unit PD1 can make the first piezoelectric element 8A perform bending vibration (circular motion) in such a way that the trajectory described by the midpoint of the first piezoelectric element 8A becomes a circular orbit centered on the first rotation axis 8AX when viewed from above when voltage is applied to the piezoelectric elements constituting the first layer and voltage is applied to the piezoelectric elements constituting the second layer at appropriate timing. That is, the first piezoelectric element 8A can realize the activity (circular motion) in which its midpoint draws a circle. In addition, in Figure 6B In the example shown, the first rotation axis 8AX is parallel to the Z axis. In addition, the first piezoelectric drive unit PD1 can switch the moving direction (rotation direction) of the midpoint following the circular orbit between the clockwise direction and the counterclockwise direction when viewed from the Z1 side by applying a voltage at an appropriate timing. By switching the rotation direction, the first piezoelectric drive unit PD1 can switch the moving direction of the first lens holder 3A along the optical axis direction. In addition, the circle (circular orbit) drawn by the midpoint of the first piezoelectric element 8A is not a perfect circle (perfect circle), as long as it is roughly circular.

[0056] Figure 6BThe arrows drawn around the first piezoelectric element 8A in the figure represent the bending vibration of the first piezoelectric element 8A (circular motion of the first piezoelectric element 8A rotating in the clockwise direction when viewed from the Z1 side while bending). In this case, the first movable side part MB1 including the first receiving part RV1 (movable side shaft part 7) in contact with the first contact part 9A of the first piezoelectric drive part PD1 moves backward (X2 direction). In addition, although not indicated by arrows, the first piezoelectric element 8A can also rotate in the counterclockwise direction when viewed from the Z1 side while bending around the first rotating axis 8AX. In this case, the first movable side part MB1 including the first receiving part RV1 (movable side shaft part 7) in contact with the first contact part 9A of the first piezoelectric drive part PD1 moves forward (X1 direction).

[0057] That is, the first lens holder 3A equipped with the first receiving member RV1 (movable side shaft member 7) moves backward (X2 direction) when the rotation direction of the midpoint of the first piezoelectric element 8A is the clockwise direction when viewed from above, and moves forward (X1 direction) when the rotation direction of the midpoint of the first piezoelectric element 8A is the counterclockwise direction. In the example shown in the figure, the midpoint of the first piezoelectric element 8A is the point where the amplitude of the first bending vibration is the largest (the point corresponding to the antinode of the first bending vibration), and is the point where the amplitude of the second bending vibration is the largest (the point corresponding to the antinode of the second bending vibration).

[0058] The first contact member 9A is mounted on the first piezoelectric element 8A and is configured to contact the first receiving member RV1 (movable side shaft member 7). In the example shown in the figure, the first contact member 9A is bonded to the inner surface of the first piezoelectric element 8A by an adhesive in a manner that covers the entire surface of the inner side (the side opposite to the optical axis OA, i.e., the Y1 side) of the first piezoelectric element 8A. The first contact member 9A is formed of a metal such as stainless steel and is configured with an appropriate thickness to be able to perform bending vibration (circular motion) according to the bending vibration (circular motion) of the first piezoelectric element 8A. In the example shown in the figure, the first contact member 9A is a friction plate formed of stainless steel. The first contact member 9A extends in the same direction as the extension direction of the first piezoelectric element 8A, i.e., the Z-axis direction. Then, the first contact member 9A is configured so that the inner surface of its central portion (the surface on the Y1 side) contacts the first receiving member RV1 (movable side shaft member 7). Specifically, the first contact member 9A is configured to contact the first receiving member RV1 (movable side shaft member 7) at the portion where the amplitude of the bending vibration (circular motion) is the largest (the portion corresponding to the antinode of the bending vibration). In addition, the surface of the first contact member 9A on the side (Y1 side) that contacts the first receiving member RV1 (movable side shaft member 7) is a convex curved surface that convexes toward the Y1 side.

[0059] The movable side shaft member 7 is typically formed of a metal such as stainless steel. In the example shown in the figure, the movable side shaft member 7 is a cylindrical rod member formed of stainless steel and extending in the optical axis direction. In addition, as long as the first contact member 9A is in contact with the movable side shaft member 7, 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 example shown in the figure, the length dimension of the first contact member 9A in the Z-axis direction is substantially the same as the length dimension of the first piezoelectric element 8A.

[0060] The first circuit substrate 10A is a substrate including a conductive pattern, and is configured to electrically connect an external power source (driving circuit) to the first piezoelectric element 8A via an outer circuit substrate 11. In the illustrated example, the first circuit substrate 10A is a flexible printed substrate having flexibility, and includes a connector portion 10C, a piezoelectric element fixing portion 10P, and a bending portion 10W.

[0061] The outer circuit board 11 (see Figure 3 ) is a substrate including a conductive pattern, and is configured to electrically connect an external power source to the circuit substrate 10 (the first circuit substrate 10A and the second circuit substrate 10B). In the example shown in the figure, the outer circuit substrate 11 is a flexible printed substrate having flexibility, and is mounted with a magnetic sensor 6 (the first magnetic sensor 6A), a first connector CN1, and a second connector CN2.

[0062] Specifically, if Figure 3 As shown in FIG. 1 , the outer side (Y2 side) of the connector portion 10C of the first circuit substrate 10A is connected to the outer circuit substrate 11 via the first connector CN1. Figure 6B As shown, the first circuit substrate 10A is configured such that the inner surface (Y1 side) of the piezoelectric element fixing portion 10P thereof is bonded to the first piezoelectric element 8A via an anisotropic conductive adhesive or an anisotropic conductive adhesive film or the like.

[0063] The second piezoelectric element 8B has the same structure as the first piezoelectric element 8A. Specifically, the second piezoelectric element 8B extends in the Z-axis direction and is configured to be able to achieve bending vibration (circular motion) with two nodes ND. That is, the portion of the two nodes ND hardly vibrates during bending vibration. In addition, the second piezoelectric element 8B has a two-layer structure stacked in the Y-axis direction, wherein the two-layer structure is composed of a first layer that achieves a first bending vibration on the XZ plane and a second layer that achieves a second bending vibration on the YZ plane. The second piezoelectric drive unit PD2 is capable of causing the second piezoelectric element 8B to perform bending vibration (circular motion) in such a manner that the trajectory described by the midpoint of the second piezoelectric element 8B becomes a circular orbit centered on the second rotation axis 8BX when viewed from above, when a voltage is applied to the piezoelectric elements constituting the first layer and a voltage is applied to the piezoelectric elements constituting the second layer at appropriate timings. That is, the second piezoelectric element 8B is capable of achieving an activity (circular motion) in which its midpoint draws a circle. In addition, in Figure 6B In the example shown, the second rotation axis 8BX is parallel to the Z axis. In addition, the second piezoelectric drive unit PD2 can switch the moving direction (rotation direction) of the midpoint following the circular orbit between the clockwise direction and the counterclockwise direction when viewed from the Z1 side by applying a voltage at an appropriate timing. By switching the rotation direction, the second piezoelectric drive unit PD2 can switch the moving direction of the second lens holder 3B along the optical axis direction. In addition, the circle (circular orbit) drawn by the midpoint of the second piezoelectric element 8B is not a perfect circle (perfect circle), but a roughly circular shape is sufficient.

[0064] Figure 6B The arrows drawn around the second piezoelectric element 8B in the figure represent the bending vibration of the second piezoelectric element 8B (circular motion of the second piezoelectric element 8B in the clockwise direction when viewed from the Z1 side while bending, rotating around the second rotation axis 8BX). In this case, the second piezoelectric drive unit PD2 of the second contact member 9B in contact with the second receiving member RV2 (movable side shaft member 7) moves forward (X1 direction). In addition, although not indicated by arrows, the second piezoelectric element 8B can also bend while rotating around the second rotation axis 8BX in the counterclockwise direction when viewed from the Z1 side. In this case, the second piezoelectric drive unit PD2 of the second contact member 9B in contact with the second receiving member RV2 (movable side shaft member 7) moves backward (X2 direction).

[0065] That is, the second lens holder 3B equipped with the second piezoelectric drive unit PD2 moves forward (X1 direction) when the rotation direction of the midpoint of the second piezoelectric element 8B is the clockwise direction when viewed from above, and moves backward (X2 direction) when the rotation direction of the midpoint of the second piezoelectric element 8B is the counterclockwise direction. In the example shown in the figure, the midpoint of the second piezoelectric element 8B is the point where the amplitude of the first bending vibration is the largest (the point corresponding to the antinode of the first bending vibration), and is the point where the amplitude of the second bending vibration is the largest (the point corresponding to the antinode of the second bending vibration).

[0066] The second contact member 9B is mounted on the second piezoelectric element 8B and is configured to contact the second receiving member RV2 (movable side shaft member 7). In the example shown in the figure, the second contact member 9B is bonded to the inner surface of the second piezoelectric element 8B by an adhesive in a manner that covers the entire surface of the inner side of the second piezoelectric element 8B (the side opposite to the optical axis OA, i.e., the Y1 side). The second contact member 9B is formed of a metal such as stainless steel and is configured with an appropriate thickness to be able to perform bending vibration (circular motion) according to the bending vibration (circular motion) of the second piezoelectric element 8B. In the example shown in the figure, the second contact member 9B is a friction plate formed of stainless steel. The second contact member 9B extends in the same direction as the extension direction of the second piezoelectric element 8B, i.e., the Z-axis direction. Then, the second contact member 9B is configured so that the inner surface of its central portion (the surface on the Y1 side) contacts the second receiving member RV2 (movable side shaft member 7). Specifically, the second contact member 9B is configured to contact the second receiving member RV2 (movable side shaft member 7) at the portion where the amplitude of the bending vibration (circular motion) is the largest (the portion corresponding to the antinode of the bending vibration). In addition, the surface of the second contact member 9B on the side (Y1 side) in contact with the second receiving member RV2 (movable side shaft member 7) is a convex curved surface convex to the Y1 side.

[0067] In addition, as long as the second contact member 9B is in contact with the movable side shaft member 7, the length dimension of the second contact member 9B in the Z-axis direction may be different from the length dimension of the second piezoelectric element 8B. In the example shown in the figure, the length dimension of the second contact member 9B in the Z-axis direction is substantially the same as the length dimension of the second piezoelectric element 8B.

[0068] The second circuit substrate 10B is a substrate including a conductive pattern, and is configured to electrically connect an external power source to the second piezoelectric element 8B via the outer circuit substrate 11. In the example shown in the figure, the second circuit substrate 10B is a flexible printed substrate having flexibility, and includes a connector portion 10C, a piezoelectric element fixing portion 10P, a sensor fixing portion 10S, and a bending portion 10W.

[0069] Specifically, if Figure 3As shown, the surface of the outer side (Y2 side) of the connector portion 10C of the second circuit substrate 10B is connected to the outer circuit substrate 11 via the second connector CN2. In addition, the second circuit substrate 10B is configured to be able to deform (bend) in accordance with the movement of the second lens holder 3B in the optical axis direction to move the position of the bending portion 10W while applying a voltage to the second piezoelectric element 8B. More specifically, the bending portion 10W moves rearward in accordance with the movement of the second lens holder 3B rearward (X2 direction), and moves forward in accordance with the movement of the second lens holder 3B forward (X1 direction). In addition, as Figure 6B As shown, the second circuit substrate 10B is configured such that the surface on the inner side (Y1 side) of its piezoelectric element fixing portion 10P is bonded to the second piezoelectric element 8B by an anisotropic conductive adhesive or anisotropic conductive adhesive film. In addition, the second circuit substrate 10B is configured such that the sensor fixing portion 10S is located on the lower side (Z2 side) of the second force applying member 13B. Then, the second circuit substrate 10B is configured such that the magnetic sensor 6 (second magnetic sensor 6B) is mounted on the surface on the lower side (Z2 side) of the sensor fixing portion 10S. In the example shown in the figure, the surface on the upper side (Z1 side) of the sensor fixing portion 10S is fixed to the surface on the lower side (Z2 side) of the second force applying member 13B by an adhesive.

[0070] In the example shown in the figure, the force applying member 13 is composed of a leaf spring member. Figure 7 As shown, the first urging member 13A includes: a fixing portion 13F fixed to the fourth side plate portion 2A4 of the base member 2; a supporting portion 13S supporting the first piezoelectric driving portion PD1; and an elastically deformable elastically deformable portion 13E provided between the fixing portion 13F and the supporting portion 13S. Figure 7 1 is a perspective view of the first force applying member 13A mounted on the base member 2. Figure 7 In the figure, for clarity, a dot pattern is given to the first biasing member 13A.

[0071] like Figure 7 As shown, the first force applying member 13A is fixed to the base member 2 via the fixing portion 13F in a manner that the supporting portion 13S and the elastic deformation portion 13E do not contact the base member 2. Specifically, the fixing portions 13F provided at both ends of the elastic deformation portion 13E are assembled to the fourth side plate portion 2A4 in a manner of being embedded in the groove 2G formed on the inner surface side of the fourth side plate portion 2A4 of the base member 2.

[0072] More specifically, the fixing portion 13F of the first force applying member 13A includes a front fixing portion 13FF and a rear fixing portion 13FB (see Figure 6B), the support portion 13S includes an upper support portion 13SU and a lower support portion 13SD. Then, the elastic deformation portion 13E includes an upper elastic deformation portion 13EU and a lower elastic deformation portion 13ED provided between the front fixing portion 13FF and the rear fixing portion 13FB. Then, the front fixing portion 13FF and the rear fixing portion 13FB have the same shape and the same size, the upper support portion 13SU and the lower support portion 13SD have the same shape and the same size, and the upper elastic deformation portion 13EU and the lower elastic deformation portion 13ED have the same shape and the same size. That is, the first force applying component 13A is constructed to be plane-symmetrical with respect to a symmetry plane parallel to the YZ plane (a plane that divides the first force applying component 13A into two parts front and back). In addition, the first force applying component 13A is constructed to be plane-symmetrical with respect to other symmetry planes parallel to the XY plane (a plane that divides the first force applying component 13A into two parts up and down).

[0073] The support portion 13S of the first biasing member 13A is configured to be bent into an L-shape from the elastic deformation portion 13E and to protrude toward the side (Y1 side) where the first lens holder 3A is located. A recess RS is formed at the top end of the support portion 13S (see Figure 6B ). The recess RS is a recess that is open on the side (Y1 side) where the first lens holder 3A is located. Specifically, the recess RS is formed to have the same shape and the same size at the top of each of the upper support portion 13SU and the lower support portion 13SD. Then, as Fig. 6A As shown, a portion of the first piezoelectric driving portion PD1 is disposed in the recess RS and is adjacent to the inner edge BE of the recess RS (see Figure 6B ) is fixed to the support portion 13S by an adhesive in a state of contact.

[0074] More specifically, if Figure 6B As shown in FIG. 1 , the recess RS has a front edge and a rear edge that are opposed to each other with the inner edge BE sandwiched therebetween. Fig. 6A As shown, the first piezoelectric driving part PD1 is arranged between the front edge part and the rear edge part.

[0075] The position where the inner edge BE of the recess RS contacts the first piezoelectric drive unit 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. Figure 6B In FIG. 1 , a cross pattern is given to the position of the node ND for clarity.

[0076] The position where the inner edge BE of the recess RS contacts the first piezoelectric driver PD1 (position of the node ND) corresponds to a position at a predetermined distance from the end of the first piezoelectric driver PD1 in the Z-axis direction. The predetermined distance is, for example, approximately one-fourth of the total length of the piezoelectric driver PD.

[0077] The first piezoelectric drive unit PD1 and the support portion 13S are fixed by an adhesive. Specifically, the first piezoelectric drive unit PD1 (first circuit substrate 10A) and the support portion 13S of the first force-applying member 13A are fixed to each other by an adhesive at the inner edge BE of the recess RS. In the example shown in the figure, the adhesive is an ultraviolet curing adhesive. However, the adhesive may also be other types of adhesives such as moisture curing or heat curing.

[0078] like Figure 6B As shown, the elastic deformation portion 13E of the first force applying member 13A has a portion extending forward (X1 direction) from the support portion 13S and a portion extending backward (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 backward 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 backward from the lower support portion 13SD. In addition, the extension direction of the elastic deformation portion 13E is along the optical axis direction.

[0079] like Figure 5C As shown, the second urging member 13B is fixed to the right end (the end on the Y2 side) of the second right bearing portion 32BR of the second lens holder 3B via the fixing portion 13F so that the support portion 13S and the elastic deformation portion 13E do not contact the second lens holder 3B.

[0080] Specifically, if Figure 6BAs shown, the fixing portion 13F of the second force-applying member 13B includes an upper fixing portion 13FU and a lower fixing portion 13FD, and the supporting portion 13S includes an upper supporting portion 13SU and a lower supporting portion 13SD. Then, the elastic deformation portion 13E includes a front elastic deformation portion 13EF and a rear elastic deformation portion 13EB provided between the fixing portion 13F and the supporting portion 13S. Then, the upper fixing portion 13FU and the lower fixing portion 13FD have the same shape and the same size, the upper supporting portion 13SU and the lower supporting portion 13SD have the same shape and the same size, and the front elastic deformation portion 13EF and the rear elastic deformation portion 13EB have the same shape and the same size. That is, the second force-applying member 13B is configured to be plane-symmetrical with respect to a symmetry plane parallel to the YZ plane (a plane that divides the second force-applying member 13B into two parts front and back). Furthermore, the second urging member 13B is configured to be plane-symmetrical with respect to another symmetry plane (a plane dividing the second urging member 13B into two parts, upper and lower) parallel to the XY plane.

[0081] The support portion 13S of the second biasing member 13B is configured to be bent into an L-shape from the elastic deformation portion 13E and to protrude toward the side (Y1 side) where the second lens holder 3B is located. A recess RS is formed at the top end of the support portion 13S (see Figure 6B ). The recess RS is a recess that is open on the side (Y1 side) where the second lens holder 3B is located. Specifically, the recess RS is formed to have the same shape and the same size at the top of each of the upper support portion 13SU and the lower support portion 13SD. Then, as Fig. 6A As shown in FIG. 1 , a portion of the second piezoelectric drive unit PD2 is disposed in the recess RS and is adjacent to the inner edge BE of the recess RS (see FIG. 1 ). Figure 6B ) is fixed to the support portion 13S by an adhesive in a state of contact.

[0082] More specifically, if Figure 6B As shown in FIG. 1 , the recess RS has a front edge and a rear edge that are opposed to each other with the inner edge BE sandwiched therebetween. Fig. 6A As shown, the second piezoelectric driving part PD2 is arranged between the front edge part and the rear edge part.

[0083] The position where the inner edge BE of the recess RS contacts the second piezoelectric drive unit PD2 corresponds to the position of the node ND of the second piezoelectric element 8B that realizes bending vibration (circular motion). The position of the node ND includes the position of the third node ND3 and the position of the fourth node ND4. Figure 6B In FIG. 1 , a cross pattern is given to the position of the node ND for clarity.

[0084] The position where the inner edge BE of the recess RS contacts the second piezoelectric driver PD2 (position of the node ND) corresponds to a position at a predetermined distance from the end of the second piezoelectric driver PD2 in the Z-axis direction. The predetermined distance is, for example, approximately one-fourth of the total length of the piezoelectric driver PD.

[0085] The second piezoelectric drive unit PD2 and the support portion 13S are fixed by an adhesive. Specifically, the second piezoelectric drive unit PD2 (the second circuit substrate 10B) and the support portion 13S (the second force-applying member 13B) are fixed to each other by an adhesive at the inner edge BE of the recess RS. In the example shown in the figure, the adhesive is an ultraviolet curing adhesive. However, the adhesive may also be other types of adhesives such as moisture curing or heat curing.

[0086] like Figure 6B As shown, the elastic deformation portion 13E of the second urging member 13B includes a front elastic deformation portion 13EF extending forward (X1 direction) from the support portion 13S and a rear elastic deformation portion 13EB extending rearward (X2 direction) from the support portion 13S. The elastic deformation portion 13E includes a portion extending along the optical axis direction.

[0087] The fixing parts 13F are provided at both ends of the elastic deformation part 13E. Figure 4 as well as Figure 5C As shown, the fixing portion 13F is assembled so as to sandwich the upper end portion and the lower end portion of the second right bearing portion 32BR of the second lens holder 3B.

[0088] In the example shown in the figure, the fixing portion 13F of the second force applying member 13B includes an upper fixing portion 13FU and a lower fixing portion 13FD. Then, the second force applying member 13B is configured to be able to clamp the right end of the second right bearing portion 32BR of the second lens holder 3B by the upper fixing portion 13FU and the lower fixing portion 13FD. In addition, the fixing of the second force applying member 13B to the second right bearing portion 32BR can be achieved by an adhesive, and can be reinforced by an adhesive material.

[0089] Next, refer to Figure 8 , the first movable side member MB1 will be described. Figure 8 3 is a front view of the lens holder 3. Specifically, Figure 8 The upper figure is a front view of the first lens holder 3A guided by the shaft member 5. Figure 8 The lower figure is a front view of the second lens holder 3B guided by the shaft members (the first shaft member 5A and the movable-side shaft member 7).

[0090] The shaft component 5 includes a first shaft component 5A and a second shaft component 5B. Then, as Figure 8As shown in the above figure, the movable side shaft component 7 as the receiving component RV is arranged at a position away from the virtual plane VP. Specifically, the axis 7X of the movable side shaft component 7 is arranged at a position that is not on the virtual plane VP. In the example shown in the figure, the movable side shaft component 7 is configured so that the axis 7X is parallel to the virtual plane VP. The virtual plane VP is a virtual plane including the axis line (first axis 5AX) of the first shaft component 5A and the axis line (second axis 5BX) of the second shaft component 5B that are parallel to each other. In the example shown in the figure, the movable side shaft component 7 is arranged at a position offset to the upper side (Z1 side) than the virtual plane VP. However, the movable side shaft component 7 can also be arranged at a position offset to the lower side (Z2 side) than the virtual plane VP. In addition, the movable side shaft component 7 (axis 7X) is configured to be parallel to the first shaft component 5A (first axis 5AX).

[0091] This structure can bring about the effect of suppressing the shaking of the first lens holder 3A. In the example shown in the figure, the first force-applying member 13A applies the force (force F1 indicated by the dashed arrow) of the first receiving member RV1 (movable side shaft member 7) mounted on the first lens holder 3A to the Y1 side, which brings about a torque (torque TQ1 indicated by the single-dot chain arrow) that intends to rotate the first lens holder 3A around the axis line (second axis 5BX) of the second axis member 5B. The torque TQ1 acts in a manner that presses the first left bearing portion 32AL of the first lens holder 3A from the upper side to the first axis member 5A. In addition to the torque TQ1, the first lens holder 3A also acts on the first lens holder 3A by its own weight, which intends to rotate the first lens holder 3A around the axis line (second axis 5BX) of the second axis member 5B (self-weight torque). Then, the first force-applying member 13A is configured so that the magnitude of the torque TQ1 brought by the force F1 is larger than the magnitude of the self-weight torque. Therefore, regardless of the posture of the lens holder driving device 101 (even if it is upside down), the composite torque obtained by synthesizing the torque TQ1 and the self-weight torque always acts in a manner that presses the first left bearing portion 32AL of the first lens holder 3A to the first shaft member 5A. That is, not only when the torque TQ1 and the self-weight torque are in the same direction, but also when the torque TQ1 and the self-weight torque are in opposite directions, the composite torque always acts in a manner that presses the first left bearing portion 32AL of the first lens holder 3A to the first shaft member 5A. As a result, regardless of the posture of the lens holder driving device 101 (even if it is upside down), the first left bearing portion 32AL of the first lens holder 3A and the first shaft member 5A are always in contact, and the occurrence of the sloshing between the first left bearing portion 32AL and the first shaft member 5A is suppressed. The same is true for the sloshing between the first right bearing portion 32AR of the first lens holder 3A and the second shaft member 5B.

[0092] like Figure 8As shown in the figure below, the magnet 4 is set at a position away from the virtual plane VP. Specifically, the magnet 4 is set at a position that is not on the virtual plane VP. In the example shown in the figure, the magnet 4 is set at a position offset to the upper side (Z1 side) than the virtual plane VP. However, the magnet 4 can also be set at a position offset to the lower side (Z2 side) than the virtual plane VP.

[0093] This structure can bring about the effect of suppressing the shaking of the second lens holder 3B. In the example shown in the figure, the magnetic attraction force (force F2 shown by the dotted arrow) acting between the magnet 4 and the first shaft member 5A brings about a torque (torque TQ2 shown by the single-dot chain arrow) that intends to rotate the second lens holder 3B around the axis (axis 7X) of the movable side shaft member 7. The torque TQ2 acts in a manner that intends to press the second left bearing portion 32BL of the second lens holder 3B from the upper side to the first shaft member 5A. In addition to the torque TQ2, the second lens holder 3B also acts on the second lens holder 3B due to its own weight, which intends to rotate the second lens holder 3B around the axis (axis 7X) of the movable side shaft member 7 (self-weight torque). Then, the magnet 4 is configured so that the magnitude of the torque TQ2 brought by the force F2 is larger than the magnitude of the self-weight torque. Therefore, no matter what posture the lens holder driving device 101 adopts (even if it is upside down), the composite torque obtained by synthesizing the torque TQ2 and the self-weight torque always acts in a manner that presses the second left bearing portion 32BL of the second lens holder 3B to the first shaft member 5A. That is, not only when the torque TQ2 and the self-weight torque are in the same direction, but also when the torque TQ2 and the self-weight torque are in opposite directions, the composite torque always acts in a manner that presses the second left bearing portion 32BL of the second lens holder 3B to the first shaft member 5A. As a result, no matter what posture the lens holder driving device 101 adopts (even if it is upside down), the second left bearing portion 32BL of the second lens holder 3B and the first shaft member 5A are always in contact, and the occurrence of shaking between the second left bearing portion 32BL and the first shaft member 5A is suppressed.

[0094] Next, refer to Fig. 9 , the position detection mechanism DT is explained. Fig. 9 1 is a diagram showing an example of the positional relationship among the magnetic sensor 6, the magnetic field generating member MG, the second circuit substrate 10B, and the outer circuit substrate 11. Specifically, Fig. 9 The upper left figure is a perspective view of the magnetic sensor 6, the magnetic field generating component MG, the second circuit substrate 10B and the outer circuit substrate 11. Fig. 9 The upper right picture is an enlarged stereoscopic picture of the magnetic field generating component MG. Fig. 9 The lower left figure is a left side view of the magnetic sensor 6, the magnetic field generating component MG, the second circuit substrate 10B and the outer circuit substrate 11, Fig. 9The lower right figure of FIG. 1 is a front view of the magnetic sensor 6 , the magnetic field generating member MG, the second circuit substrate 10B, and the outer circuit substrate 11 .

[0095] 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.

[0096] The magnetic field generating member MG is a member configured to generate a magnetic field, and is a permanent magnet or an electromagnet. In the example shown in the figure, the magnetic field generating member MG is a permanent magnet with multi-polar magnetization on both sides, and is fixed to the first right bearing portion 32AR of the first lens holder 3A. Fig. 9 In the upper right figure, in order to make the explanation easier to understand, a cross pattern is given to the N-pole portion of the magnetic field generating component MG, and a dot pattern is given to the S-pole portion of the magnetic field generating component MG.

[0097] The magnetic sensor 6 is configured to detect the magnetic field generated by the magnetic field generating part MG. In the example shown in the figure, the magnetic sensor 6 is composed of a giant magnetoresistance effect (Giant Magneto Resistive effect: GMR) element, and is configured to measure the voltage value received by the magnetic sensor 6 that changes accordingly with the size of the magnetic field generated by the magnetic field generating part MG, and output the measured voltage value to the drive circuit. The drive circuit is configured to detect the position of the lens holder 3 equipped with the magnetic sensor 6 or the magnetic field generating part MG based on the output of the magnetic sensor 6. Then, the magnetic sensor 6 is configured to output a larger voltage value as the N-pole part is closer, and a smaller voltage value as the S-pole part is closer. However, the magnetic sensor 6 can also be configured to output a smaller voltage value as the N-pole part is closer, and a larger voltage value as the S-pole part is closer. In addition, the magnetic sensor 6 can be configured to detect the position of the lens holder 3 using other magnetoresistive elements such as semiconductor magnetoresistive (SMR) elements, anisotropic magnetoresistive (AMR) elements, or tunnel magnetoresistive (TMR) elements, or can be configured to detect the position of the lens holder 3 using Hall elements, etc.

[0098] In the example shown in the figure, the position detection mechanism DT includes a first position detection mechanism DT1 for detecting the position of the first lens holder 3A and a second position detection mechanism DT2 for detecting the position of the second lens holder 3B. The magnetic sensor 6 includes a first magnetic sensor 6A mounted on the outer circuit substrate 11 and a second magnetic sensor 6B mounted on the sensor fixing portion 10S of the second circuit substrate 10B. The magnetic field generating component MG is configured so that its lower half functions as a first magnetic field generating component MG1 corresponding to the first magnetic sensor 6A, and its upper half functions as a second magnetic field generating component MG2 corresponding to the second magnetic sensor 6B. Then, the first position detection mechanism DT1 includes the first magnetic sensor 6A and the first magnetic field generating component MG1, and the second position detection mechanism DT2 includes the second magnetic sensor 6B and the second magnetic field generating component MG2. In addition, the first magnetic field generating component MG1 and the second position detection mechanism DT2 may also be a single independent component.

[0099] When the first movable member MB1 moves in the optical axis direction, the first magnetic field generating member MG1 fixed to the first right bearing portion 32AR of the first lens holder 3A and the first magnetic sensor 6A fixed to the base member 2 (outer circuit board 11 ) move relatively.

[0100] The drive circuit obtains the voltage value output by the first magnetic sensor 6A at each predetermined control cycle, and derives the relative position of the first lens holder 3A with respect to the base member 2 as the current position of the first lens holder 3A based on the change of the voltage value. Then, the drive circuit controls the voltage applied to the first piezoelectric element 8A of the first piezoelectric drive unit PD1 while confirming the current position of the first lens holder 3A, thereby enabling the first lens holder 3A to be moved to a desired position.

[0101] Similarly, if the second movable side component MB2 moves relative to the first lens holder 3A along the optical axis, the second magnetic sensor 6B fixed to the sensor fixing part 10S of the second circuit substrate 10B and the second magnetic field generating component MG2 fixed to the first right bearing part 32AR of the first lens holder 3A move relative to each other.

[0102] The drive circuit obtains the voltage value output by the second magnetic sensor 6B at each predetermined control cycle, and derives the relative position of the second lens holder 3B with respect to the first lens holder 3A as the current position of the second lens holder 3B based on the change of the voltage value. Then, the drive circuit controls the voltage applied to the second piezoelectric element 8B of the second piezoelectric drive unit PD2 while determining the current position of the second lens holder 3B, thereby enabling the second lens holder 3B to be moved to a desired position.

[0103] With such a configuration, the lens holder driving device 101 can move the first lens body LS1 and the second lens body LS2 in an integrated manner in the optical axis direction through the first piezoelectric driving unit PD1. On this basis, the lens holder driving device 101 can move the second lens body LS2 relative to the first lens body LS1 in the optical axis direction through the second piezoelectric driving unit PD2. Therefore, the lens holder driving device 101 can increase or decrease the distance between the first lens body LS1 and the second lens body LS2 while moving the first lens body LS1 and the second lens body LS2 in the same direction at approximately the same speed.

[0104] As mentioned above, Figure 3 As shown, the lens holder driving device 101 of the embodiment of the present invention includes: a fixed side member FB; 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 configured to have the same optical axis as the first lens body LS1; an axis member that guides the first lens holder 3A and the second lens holder 3B to be movable in the optical axis direction; a first movable side member MB1 including the first lens holder 3A; a second movable side member MB2 including the second lens holder 3B; a first piezoelectric drive unit PD1 configured to have a first piezoelectric element 8A, and the first movable side member MB1 is moved in the optical axis direction by the movement of the first piezoelectric element 8A; and a second piezoelectric drive unit PD2 configured to have a second piezoelectric element 8B, and the second movable side member MB2 is moved in the optical axis direction by the movement of the second piezoelectric element 8B. The second movable side member MB2 is included in the first movable side member MB1 and is movable in the optical axis direction relative to the first lens holder 3A. That is, the second movable side member MB2 is a part of the first movable side member MB1, and moves in the optical axis direction not only by the second piezoelectric drive unit PD2, but also by the first piezoelectric drive unit PD1. The first piezoelectric drive unit PD1 is provided on the fixed side member FB or the first lens holder 3A so that the second lens holder 3B can move in the optical axis direction relative to the fixed side member FB together with the first lens holder 3A. The second piezoelectric drive unit PD2 is provided on the second movable side member MB2 or the first lens holder 3A so that the second lens holder 3B can move in the optical axis direction relative to the first lens holder 3A.

[0105] Through this configuration, the lens holder driving device 101 can move the first lens holder 3A and the second lens holder 3B together (simultaneously) in the direction of the optical axis. For example, when the lens is zoomed in or out, the lens holder driving device 101 can move the first lens body LS1 (zoom lens) and the second lens body LS2 (focusing lens) in a state where the distance between the first lens body LS1 (zoom lens) and the second lens body LS2 (focusing lens) is maintained, that is, in a focused state. Therefore, the lens holder driving device 101 can shorten the time required for focusing after zooming in or out. In addition, under specified circumstances such as when the distance to the subject changes slightly, the lens holder driving device 101 can move the second lens body LS2 (focusing lens) alone without moving the first lens body LS1 (zoom lens).

[0106] exist Figure 3 In the example shown, the first piezoelectric drive unit PD1 is provided on the fixed side member FB (base member 2). Specifically, the first movable side member MB1 has a first receiving member RV1 extending in the optical axis direction and receiving the movement of the first piezoelectric drive unit PD1 (force generated by the movement). The first piezoelectric drive unit PD1 is forced toward the first receiving member RV1 by the first force applying member 13A provided on the fixed side member FB (base member 2). This mechanism has the effect of simplifying the structure of the lens holder drive device 101.

[0107] Furthermore, the fixed side member FB may include a shaft member 5 (a first shaft member 5A and a second shaft member 5B) extending in the optical axis direction and guiding the first movable side member MB1 to be movable in the optical axis direction. Figure 8 As shown, the first receiving member RV1 may be provided at a position offset from a virtual plane VP passing through the centers of the first shaft member 5A and the second shaft member 5B.

[0108] With this configuration, the lens holder driving device 101 can suppress the shaking of the first lens holder 3A when the first lens holder 3A is moved in the optical axis direction. This is because the lens holder driving device 101 can continuously press the first piezoelectric drive unit PD1 against the first receiving member RV1 through the first force applying member 13A to continuously press the first lens holder 3A against the shaft member 5.

[0109] In the example shown in the figure, the second piezoelectric drive unit PD2 is provided in the second movable side member MB2 (the second lens holder 3B). Figure 4As shown, the first lens holder 3A may also have a second receiving part RV2 extending in the optical axis direction and receiving the movement (force generated by the movement) of the second piezoelectric drive unit PD2. Then, the second piezoelectric drive unit PD2 may also be forced toward the second receiving part RV2 by the second force applying part 13B provided on the second movable side part MB2 (second lens holder 3B). In this mechanism, the first receiving part RV1 and the second receiving part RV2 are both provided on the first lens holder 3A, so that the structure of the lens holder drive device 101 can be simplified.

[0110] like Figure 3 As shown, the first receiving member RV1 and the second receiving member RV2 may be formed of the same shaft member (the movable side shaft member 7). That is, the movable side shaft member 7 may be used for both the first receiving member RV1 and the second receiving member RV2.

[0111] This configuration has the effect of reducing the number of parts. In addition, this configuration has the effect of miniaturizing the lens holder driving device 101. However, the first receiving member RV1 and the second receiving member RV2 may be formed of two separate shaft members.

[0112] In addition, as described above, the fixed side member FB may also have an axis member 5 (first axis member 5A and second axis member 5B) extending in the optical axis direction and guiding the first movable side member MB1 to be movable in the optical axis direction. In this case, the second movable side member MB2 (second lens holder 3B) may also be guided to be movable in the optical axis direction relative to the first movable side member MB1 (first lens holder 3A) by an axis member (movable side axis member 7) different from one of the first axis member 5A and the second axis member 5B. Figure 8 In the example shown in the following figure, the second movable side member MB2 (second lens holder 3B) is guided by the first shaft member 5A and the movable side shaft member 7 so as to be movable in the optical axis direction relative to the first lens holder 3A.

[0113] In this structure, the movement of the second movable side member MB2 is guided by two shaft members, so this structure can bring about the effect of properly guiding the second movable side member MB2. This is because if the movement of the second movable side member MB2 is guided by three shaft members, it is likely that the movement of the second movable side member MB2 will be hindered. In addition, this structure is realized as a whole by three shaft members (the first shaft member 5A, the second shaft member 5B, and the movable side shaft member 7), so it can bring about the effect of simplifying the structure of the lens holder drive device 101. In addition, this structure is realized as a whole by three shaft members, so it can bring about the effect of miniaturization of the lens holder drive device 101.

[0114] One of the first shaft member 5A and the second shaft member 5B is arranged at a position facing the other of the first shaft member 5A and the second shaft member 5B and the other shaft member (the movable side shaft member 7) via the second lens body LS2. Figure 8 In the example shown in the following figure, the first shaft member 5A is arranged at a position facing the second shaft member 5B and the movable-side shaft member 7 via the second lens body LS2.

[0115] This configuration has an effect of appropriately guiding the movement of each of the first lens holder 3A and the second lens holder 3B in the optical axis direction because the distance between the two shaft members used for guidance can be increased.

[0116] In addition, one of the first shaft member 5A and the second shaft member 5B that guide the movement of the second movable side member MB2 and at least one of the other shaft members (movable side shaft member 7) may be magnetic metal members. Then, a magnet 4 may be provided in the second movable side member MB2. In this case, the magnet 4 and the magnetic metal member may also be configured to exert an attractive force between the magnet 4 and the magnetic metal member. Figure 8 In the example shown in the following figure, the first shaft member 5A is a magnetic metal member, and the magnet 4 and the first shaft member 5A are configured so that an attractive force acts between the magnet 4 and the first shaft member 5A.

[0117] This configuration has an effect of preventing the second movable member MB2 from rattling when the second movable member MB2 moves in the optical axis direction.

[0118] In addition, one of the first shaft member 5A and the second shaft member 5B may be a magnetic metal member. In this case, the magnet 4 may be provided on the side opposite to the second piezoelectric drive unit PD2 via the second lens body LS2. Figure 8 In the example shown in the following figure, the first shaft member 5A is a magnetic metal member, and the magnet 4 is provided on the opposite side to the second piezoelectric driving unit PD2 via the second lens body LS2.

[0119] This configuration can improve the assemblability of the lens holder driving device 101. This is because in this configuration, the second piezoelectric driving unit PD2 and the magnet 4 are arranged separately from each other, and the assembly of the second piezoelectric driving unit PD2 and the magnet 4 to the second movable member MB2 does not become complicated.

[0120] The first movable side part MB1 (first lens holder 3A) may be provided with a magnetic field generating part MG. In this case, the fixed side part FB may be provided with a first magnetic sensor 6A for detecting the magnetic field of the magnetic field generating part MG, and the second movable side part MB2 may be provided with a second magnetic sensor 6B for detecting the magnetic field of the magnetic field generating part MG.

[0121] In this configuration, the magnetic field generating member MG is shared by the first magnetic sensor 6A for detecting the relative position of the first lens holder 3A with respect to the base member 2 and the second magnetic sensor 6B for detecting the relative position of the second movable side member MB2 (second lens holder 3B) with respect to the first lens holder 3A. Therefore, this configuration can simplify the configuration of the lens holder driving device 101. In addition, this configuration can reduce the number of components.

[0122] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the above embodiments. Various deformations and substitutions can be applied to the above embodiments without departing from the scope of the present invention. In addition, the features described with reference to the above embodiments can be appropriately combined as long as no technical contradiction occurs.

[0123] For example, in the above-mentioned embodiment, when the lens holder 3 moves in the optical axis direction, the portion (first through hole TH1, first groove CT1, third groove CT3 and fifth groove CT5) that functions as the guided portion guided by the shaft component 5 (first shaft component 5A and second shaft component 5B) is provided in the first lens holder 3A and the second lens holder 3B, and the portion that functions as the guided portion can also be provided in the first lens body LS1 and the second lens body LS2.

[0124] This application claims the benefit of priority based on Japanese Patent Application No. 2022-128149 filed on August 10, 2022, the entire contents of which are incorporated herein by reference.

[0125] Description of Reference Numerals

[0126]

Claims

1. A lens holder driving device, characterized in that: have: Fixed side parts; a first lens holder capable of holding a first lens body; a second lens holder capable of holding a second lens body, the second lens body being configured to have the same optical axis as the first lens body; A first movable side member including the first lens holder; A second movable side member including the second lens holder; A first piezoelectric drive unit is configured to include a first piezoelectric element, and to move the first movable-side member in the optical axis direction by movement of the first piezoelectric element; and The second piezoelectric drive unit is configured to include a second piezoelectric element, and the second movable side member is moved in the optical axis direction by the movement of the second piezoelectric element. The second movable side member is included in the first movable side member and is movable in the optical axis direction relative to the first lens holder. The first piezoelectric drive unit is provided on the fixed side member or the first lens holder. The second piezoelectric driving section is provided on the second movable-side member or the first lens holder.

2. The lens holder driving device according to claim 1, wherein: The first piezoelectric driving unit is provided on the fixed side component. The first movable side member includes a first receiving member extending in the optical axis direction and receiving the movement of the first piezoelectric drive unit. The first piezoelectric drive unit is urged toward the first receiving member by a first urging member provided on the fixed-side member.

3. The lens holder driving device according to claim 2, wherein: The fixed side member includes a first shaft member and a second shaft member which guide the first movable side member so as to be movable in the optical axis direction and extend in the optical axis direction. The first receiving member is provided at a position offset from a virtual plane passing through respective centers of the first shaft member and the second shaft member.

4. The lens holder driving device according to claim 2, wherein: The second piezoelectric driving unit is provided on the second movable side member. The first lens holder includes a second receiving member extending in the optical axis direction and receiving the movement of the second piezoelectric drive unit. The second piezoelectric drive unit is urged toward the second receiving member by a second urging member provided on the second movable-side member.

5. The lens holder driving device according to claim 4, wherein: The first receiving member and the second receiving member are formed of the same shaft member.

6. The lens holder driving device according to claim 5, wherein: The fixed side member includes a first shaft member and a second shaft member which guide the first movable side member so as to be movable in the optical axis direction and extend in the optical axis direction. The second movable-side member is guided by the shaft member and one of the first shaft member and the second shaft member so as to be movable in the optical axis direction relative to the first lens holder.

7. The lens holder driving device according to claim 6, wherein: One of the first shaft member and the second shaft member is disposed at a position facing the other of the first shaft member and the second shaft member and the shaft member via the second lens body.

8. The lens holder driving device according to claim 6 or 7, wherein: One of the first shaft member and the second shaft member that guide the movement of the second movable-side member and at least one of the shaft members are magnetic metal members, The second movable side member is provided with a magnet. An attractive force acts between the magnet and the magnetic metal member.

9. The lens holder driving device according to claim 8, wherein: One of the first shaft member and the second shaft member is the magnetic metal member. The magnet is provided on the side opposite to the second piezoelectric driving unit across the second lens body.

10. The lens holder driving device according to any one of claims 1 to 7, wherein: The first movable side member is provided with a magnetic field generating member, The fixed side member is provided with a first magnetic sensor for detecting the magnetic field of the magnetic field generating member. The second movable-side member is provided with a second magnetic sensor for detecting the magnetic field of the magnetic field generating member.

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