JP6863140B2 - Lens drive device - Google Patents

Description

The present invention relates to a lens driving device.

For example, Patent Document 1 describes a lens driving device used in an imaging device mounted on a mobile phone or the like. The lens driving device disclosed in Patent Document 1 realizes a camera shake correction function by moving the lens unit in two directions orthogonal to the optical axis direction by using two actuators.

Such a lens driving device includes a plurality of movable bodies sequentially stacked with respect to the base member. The lens driving device realizes a camera shake correction function by moving a plurality of movable bodies with respect to the base member.

Japanese Unexamined Patent Publication No. 2011-158551

In the lens driving device described in Patent Document 1, since a plurality of movable bodies are sequentially stacked on the base member, the height (the size in the optical axis direction) becomes large.

Therefore, one aspect of the present invention is to provide a lens driving device capable of reducing the height.

One aspect of the present invention is a lens driving device for driving a lens, in which a base member having a first opening through which the optical axis of the lens passes is arranged so as to be overlapped with respect to the base member in the optical axis direction of the lens. It has an auxiliary body, a first actuator provided on the base member that moves the auxiliary body with respect to the base member, and a second opening through which the optical axis passes, and is stacked on the same side as the auxiliary body with respect to the base member. The first actuator includes an arranged movable body, a second actuator provided on the auxiliary body and moving the movable body with respect to the auxiliary body, and a lens carrier held by the movable body and to which a lens can be attached. , The auxiliary body is moved in the X-axis direction orthogonal to the optical axis direction, the second actuator moves the movable body in the Y-axis direction orthogonal to the optical axis direction and the X-axis direction, and the auxiliary body and the lens carrier are They do not overlap each other when viewed along the optical axis.

In this lens driving device, the first actuator moves the auxiliary body in the X-axis direction with respect to the base member. The second actuator moves the movable body in the Y-axis direction with respect to the auxiliary body. As a result, the movable body (lens carrier) is moved in the X-axis direction and the Y-axis direction with respect to the base member, and the camera shake correction function is realized. Since the auxiliary body and the lens carrier do not overlap in the optical axis direction, the height of the lens driving device becomes smaller than when the auxiliary body overlaps the lens carrier. This makes it possible to reduce the height of the lens driving device.

The auxiliary body may extend along the Y-axis direction. In this case, since the auxiliary body does not extend in the X-axis direction, the lens driving device can reduce the size in the X-axis direction.

The first actuator has an X-axis piezoelectric element that can expand and contract in the X-axis direction, and an X-axis drive shaft that is fixed to one end of the X-axis piezoelectric element in the X-axis direction. It has an X-axis friction engaging portion that frictionally engages with the shaft drive shaft, and a first urging portion that biases the X-axis drive shaft toward the X-axis friction engaging portion, and has an X-axis in the first actuator. The end on the drive shaft side may face away from the lens carrier. As a result, the X-axis friction engaging portion and the first urging portion that sandwich the X-axis drive shaft can be separated from the lens carrier. That is, the lens driving device can secure the installation space of the X-axis friction engaging portion and the first urging portion while suppressing the restrictions imposed by the lens carrier.

The second actuator has a Y-axis piezoelectric element that can expand and contract in the Y-axis direction, and a Y-axis drive shaft that is fixed to one end of the Y-axis piezoelectric element in the Y-axis direction. It has a Y-axis friction engaging portion that frictionally engages with the shaft drive shaft and a second urging portion that biases the Y-axis drive shaft toward the Y-axis friction engaging portion, and has a Y-axis in the second actuator. The end on the drive shaft side may face away from the lens carrier. As a result, the Y-axis friction engaging portion and the second urging portion that sandwich the Y-axis drive shaft can be separated from the lens carrier. That is, the lens driving device can secure the installation space of the Y-axis friction engaging portion and the second urging portion while suppressing the restrictions imposed by the lens carrier.

When viewed along the X-axis direction, the optical axis passes through the auxiliary body, and the first actuator and the second actuator are positioned so as to face each other across the optical axis when viewed along the X-axis direction. It may be provided in. Generally, the lens has a circular shape. Therefore, the lens carrier also has a substantially annular shape along the lens. As a result, the distance between the auxiliary body and the lens carrier becomes wider at a position away from the optical axis than near the optical axis when viewed along the X-axis direction. When viewed along the X-axis direction, the first actuator and the second actuator are provided at positions facing each other with the optical axis in between, so that the lens driving device can use the first actuator and the second actuator. It can be placed in a part where the distance between the auxiliary body and the lens carrier is wide. As a result, the lens driving device can arrange the first actuator and the second actuator at appropriate positions while suppressing the increase in size of the device.

When viewed along the optical axis, the lens carrier is placed closer to the other end than one end of the base member, and the auxiliary body is located at one end of the base member rather than the other end. It may be arranged close to the part. In this case, the lens carrier is arranged at a position eccentric with respect to the base member. The auxiliary body is installed in the vacant space due to the eccentric arrangement of the lens carriers. As a result, the lens driving device can arrange the auxiliary body and the lens carrier in an appropriate place while suppressing the increase in size of the device.

The lens driving device may be provided on the movable body and may further include a third actuator that moves the lens carrier in the optical axis direction with respect to the movable body. In this case, the lens driving device can realize the focusing function of the lens.

The third actuator may face the auxiliary body via the lens carrier. In this case, the lens driving device can secure the installation space for the third actuator while suppressing the restrictions imposed by the first actuator, the second actuator, and the like provided around the auxiliary body.

The third actuator has a Z-axis piezoelectric element that can expand and contract in the optical axis direction, and a Z-axis drive shaft that is fixed to one end of the Z-axis piezoelectric element in the optical axis direction, and the lens carrier is a lens. The carrier main body to which the lens can be attached, the Z-axis friction engaging portion provided on the carrier main body and frictionally engaged with the Z-axis drive shaft, and the Z-axis drive shaft are urged toward the Z-axis friction engaging portion. It has a third urging portion, and the third urging portion may face the auxiliary body via the carrier main body portion. In this case, the lens driving device can secure the installation space of the third urging portion while suppressing the restrictions imposed by the first actuator, the second actuator, and the like provided around the auxiliary body.

According to one aspect of the present invention, it is possible to reduce the height of the lens driving device.

It is an exploded perspective view which shows the schematic structure of the lens driving device which concerns on embodiment. It is a perspective view which shows the base member of FIG. It is a top view which shows the base member of FIG. It is a perspective view which shows the circumference of the X-axis actuator support part of FIG. 2 enlarged. It is a perspective view which shows the auxiliary body of FIG. It is a perspective view which shows the state which the auxiliary body is assembled to the base member of FIG. It is sectional drawing cut along the line VII-VII of FIG. It is a perspective view which shows the movable body of FIG. It is a top view which shows the state which the auxiliary body and the movable body are assembled with the base member of FIG. It is a perspective view which shows the state which the auxiliary body and the movable body are assembled with the base member of FIG. It is sectional drawing which cut along the XI-XI line in FIG. It is a perspective view which shows the state which the auxiliary body and the movable body are assembled with the base member of FIG. 1 from another angle. It is a perspective view which shows the lens carrier of FIG. It is a top view which shows the lens carrier of FIG. FIG. 5 is a perspective view showing a state in which an auxiliary body, a movable body, and a lens carrier are assembled to the base member of FIG. It is a top view which shows the state which the auxiliary body, the movable body, and the lens carrier are assembled with the base member of FIG. It is sectional drawing which cut the lens drive device of FIG. 1 along the optical axis direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

The lens driving device 1 shown in FIG. 1 is mounted on an imaging device such as a digital camera and drives the lens 4. The lens driving device 1 includes a lens driving unit 2 and a cover 3. The lens driving device 1 has an optical axis L of a lens 4 to be attached to the lens driving unit 2.

In each figure, the XYZ Cartesian coordinate system is shown for convenience of explanation. The Z-axis direction is the L direction of the optical axis of the lens 4 to be attached. The X-axis direction is orthogonal to the L-direction of the optical axis. The Y-axis direction is orthogonal to the optical axis L direction and orthogonal to the X-axis direction.

As shown in FIG. 1, the lens driving unit 2 includes a base member 100, an auxiliary body 200, a movable body 300, a lens carrier 400, an X-axis actuator (first actuator) 130, and a Y-axis actuator (second actuator) 230. And a Z-axis actuator (third actuator) 330. The lens driving unit 2 further includes a frame member 500 arranged so as to cover the periphery of the lens carrier 400.

Each member such as the auxiliary body 200 is arranged on one surface of the base member 100. A lens 4 is attached to the lens carrier 400. The lens carrier 400 is moved in the X-axis direction and the Y-axis direction with respect to the base member 100 by the operation of the X-axis actuator 130 and the Y-axis actuator 230. The lens carrier 400 is moved in the Z-axis direction with respect to the base member 100 by the operation of the Z-axis actuator 330.

First, the details around the base member 100 will be described. As shown in FIGS. 2 and 3, the base member 100 includes a base body portion 110, an actuator mounting portion 111, a stopper portion 112, a first strut portion 113, a second strut portion 114, and an X-axis actuator support portion 120. I have.

The base main body 110 is formed in a substantially rectangular plate shape having four corners when viewed along the optical axis L direction. For convenience of explanation, the four sides constituting the outer peripheral edge of the base main body 110 when viewed along the optical axis L direction are referred to as side H11, side H12, side H13, and side H14, respectively. Sides H11 and H12 are parallel and extend along the Y-axis direction. Sides H13 and H14 are parallel and extend along the X-axis direction. When the base main body 110 is viewed along the optical axis L direction, each side is connected in the order of side H11, side H14, side H12, and side H13 to form an outer peripheral edge. The lengths of the sides H11 and H12 are shorter than the lengths of the sides H13 and H14.

The base main body 110 is provided with a circular opening (first opening) 110a centered on the optical axis L (through which the optical axis L passes). When viewed along the optical axis L direction, the center position (optical axis L) of the opening 110a is eccentric with respect to the center position of the base main body 110 having a substantially rectangular plate shape. Specifically, the opening 110a is provided at a position closer to the side H12 than the side H11 when viewed along the optical axis L direction.

The X-axis actuator support portion 120 is provided on the surface of the base main body portion 110 on the side where the auxiliary body 200 is arranged. The X-axis actuator support portion 120 is provided on the surface of the base main body portion 110 in the vicinity of the corner portion where the side H11 and the side H14 are connected. The X-axis actuator support portion 120 supports the X-axis actuator 130 (X-axis drive shaft 132) from the base main body portion 110 side. As shown in FIG. 4, the X-axis actuator support portion 120 includes a first support portion 121, a second support portion 122, and a wall portion 123. In FIG. 4, the X-axis actuator 130 is omitted in order to show the details of the X-axis actuator support portion 120.

The first support portion 121 and the second support portion 122 are arranged side by side in the X-axis direction. The first support portion 121 is located on the side H11 side of the second support portion 122. A predetermined gap is provided between the first support portion 121 and the second support portion 122. The tops of the first support portion 121 and the second support portion 122 are provided with grooves 121a and 122a having a substantially U-shaped cross section extending along the X-axis direction, respectively. The wall portion 123 is provided between the first support portion 121 and the second support portion 122. The wall portion 123 connects the ends of the first support portion 121 and the second support portion 122 on the side H14 side. The base main body 110 and the X-axis actuator support 120 are integrally provided.

As shown in FIGS. 2 and 3, the X-axis actuator 130 is provided on the surface of the base main body 110 on the side where the auxiliary body 200 is arranged. The X-axis actuator 130 is provided in the vicinity of the corner portion where the side H11 and the side H14 of the base main body 110 are connected. The X-axis actuator 130 is an actuator that constitutes a smooth impact drive mechanism. The X-axis actuator 130 includes a prismatic X-axis piezoelectric element 131, an X-axis drive shaft 132, and a weight portion 133.

The X-axis piezoelectric element 131 is an element that can expand and contract in the X-axis direction. The X-axis piezoelectric element 131 is made of a piezoelectric material. As the piezoelectric material, lead zirconate titanate (so-called PZT), crystal, lithium niobate (LiNbO ₃ ), potassium tantalate niobate (K (Ta, Nb) O ₃ ), barium titanate (BaTIO ₃ ), Inorganic piezoelectric materials such as lithium tantalate (LiTaO ₃ ) and barium titanate (SrTIO _{3) can be used.}

The X-axis piezoelectric element 131 may have a laminated structure in which a plurality of piezoelectric layers made of the above-mentioned piezoelectric material and a plurality of electrode layers are alternately laminated. By controlling the voltage applied to the X-axis piezoelectric element 131, the expansion and contraction of the X-axis piezoelectric element 131 is controlled. The X-axis piezoelectric element 131 is not limited to a prismatic shape, but may be a columnar shape or the like as long as it has a shape that allows expansion and contraction in the X-axis direction.

The X-axis drive shaft 132 is formed in a cylindrical shape, and is arranged so that a cylindrical axis extends along the X-axis direction. The X-axis drive shaft 132 is made of a composite resin material containing fibers such as carbon fiber.

One end of the X-axis drive shaft 132 in the X-axis direction is fixed to one end of the X-axis piezoelectric element 131 in the X-axis direction. Both ends of the X-axis drive shaft 132 are housed in the groove 121a of the first support portion 121 and the groove 122a of the second support portion 122, respectively. The tip of the wall portion 123 in the rising direction supports the X-axis drive shaft 132 from the side H14 side of the base main body portion 110 when viewed along the optical axis L direction.

The weight portion 133 is fixed to the other end portion of the X-axis piezoelectric element 131 in the X-axis direction. The weight portion 133 is formed of a material having a high specific gravity such as tungsten or a tungsten alloy, and is designed to be heavier than the X-axis drive shaft 132. By making the weight portion 133 heavier than the X-axis drive shaft 132, it is possible to easily mutate the X-axis drive shaft 132 side when the X-axis piezoelectric element 131 expands and contracts.

The actuator mounting portion 111 is provided on the surface of the base main body portion 110 on the side where the auxiliary body 200 is arranged. The actuator mounting portion 111 is provided so as to stand up from the base main body portion 110 at a position on the side H12 side of the X-axis actuator support portion 120. The surface of the weight portion 133 opposite to the side to which the X-axis piezoelectric element 131 is fixed is fixed to the actuator mounting portion 111. As a result, the X-axis actuator 130 is in a state where the X-axis drive shaft 132 is supported by the X-axis actuator support portion 120 and fixed to the actuator mounting portion 111.

The X-axis actuator 130 is arranged so that the X-axis drive shaft 132 side faces the outside when viewed along the optical axis L direction. That is, the end of the X-axis actuator 130 on the X-axis drive shaft 132 side faces away from the lens carrier 400 (see FIG. 15 and the like).

For fixing the X-axis piezoelectric element 131 and the X-axis drive shaft 132, fixing the X-axis piezoelectric element 131 and the weight portion 133, and fixing the weight portion 133 and the actuator mounting portion 111, for example, an epoxy adhesive or the like is used. Adhesives are used.

The stopper portion 112, the first strut portion 113, and the second strut portion 114 are each provided on the surface of the base main body portion 110 on the side where the auxiliary body 200 is arranged. The stopper portion 112, the first strut portion 113, and the second strut portion 114 are provided so as to stand up from the surface of the base main body portion 110 on the side where the auxiliary body 200 is arranged.

The stopper portion 112 is provided in the vicinity of the side H13 of the base main body portion 110. The stopper portion 112 limits the movement range of the movable body 300 in the X-axis direction. Details of the limitation of the moving range by the stopper portion 112 will be described later.

The first strut portion 113 is provided at a corner portion where the side H12 and the side H13 are connected on the surface of the base main body portion 110. The second strut portion 114 is provided at a corner portion where the side H12 and the side H14 are connected on the surface of the base main body portion 110. The first strut portion 113 and the second strut portion 114 support the cover 3 from the inside. The actuator mounting portion 111, the stopper portion 112, the first strut portion 113, and the second strut portion 114 are provided integrally with the base main body portion 110.

Protrusions T11 to T13 are provided on the surface of the base main body 110 on the side where the auxiliary body 200 is arranged. The protrusion T11 is provided on the surface of the base main body 110 in the vicinity of the corner where the side H11 and the side H13 are connected. The protrusion T12 is provided at a position between the stopper portion 112 and the first support support portion 113 on the surface of the base main body portion 110. The protruding portion T13 is provided on the surface of the base main body portion 110 in the vicinity of the corner portion where the side H12 and the side H14 are connected. The protrusions T11 to T13 and the base main body 110 are integrally provided. The protrusions T11 to T13 may be, for example, hemispherical or may have a convex shape with a flat top.

Next, the details of the configuration of the auxiliary body 200 will be described. As shown in FIG. 5, the auxiliary body 200 is a rod-shaped member that extends along the Y-axis direction when assembled to the base member 100. The auxiliary body 200 includes an auxiliary body main body 210 and a Y-axis actuator support 220. The auxiliary body main body 210 and the Y-axis actuator support 220 are integrally provided.

The auxiliary body main body 210 is provided with an X-axis friction engaging portion 240. The X-axis friction engaging portion 240 is provided at an end portion of the auxiliary body main body portion 210 opposite to the side to which the Y-axis actuator support portion 220 is connected. The X-axis friction engaging portion 240 is provided on the outer surface of the auxiliary body main body 210 facing the X-axis actuator 130 side when the auxiliary body 200 is assembled to the base member 100. The X-axis friction engaging portion 240 is formed in a substantially V-shaped groove extending along the X-axis direction when the auxiliary body 200 is assembled to the base member 100. A substantially V-shaped metal plate 241 is attached to the X-axis friction engaging portion 240 (see FIG. 7). The X-axis friction engaging portion 240 comes into contact with the X-axis drive shaft 132 via the metal plate 241.

A first urging portion 242 is attached to the auxiliary body main body portion 210 (see FIG. 7). The first urging portion 242 is an elastic member. One end of the first urging portion 242 is fixed to the auxiliary body main body portion 210. The other end (tip) of the first urging portion 242 faces the X-axis friction engaging portion 240.

A protrusion T21 is provided on the surface of the auxiliary body main body 210 opposite to the side on which the X-axis friction engaging portion 240 is provided. The protrusion T21 is located near the end of the auxiliary body main body 210 on the side where the X-axis friction engaging portion 240 is provided. The protrusion T21 and the auxiliary body main body 210 are integrally provided. The protrusion T21 may be, for example, hemispherical or may have a convex shape with a flat top. The protrusion T21 comes into contact with the inner surface of the cover 3 when the auxiliary body 200 is lifted from the base main body 110.

The Y-axis actuator support portion 220 supports the Y-axis actuator 230 (Y-axis drive shaft 232) from the base main body portion 110 side in a state where the auxiliary body 200 is assembled to the base member 100. The Y-axis actuator support portion 220 has the same configuration as the X-axis actuator support portion 120 provided on the base member 100. Specifically, the Y-axis actuator support portion 220 includes a first support portion 221, a second support portion 222, and a wall portion 223.

The first support portion 221 and the second support portion 222 are provided so as to be arranged along the Y-axis direction when the auxiliary body 200 is assembled to the base member 100. The second support portion 222 is provided on the auxiliary body main body portion 210 side with respect to the first support portion 221. A predetermined gap is provided between the first support portion 221 and the second support portion 222. At the tops of the first support portion 221 and the second support portion 222, grooves 221a and 222a having a substantially U-shaped cross section extending along the Y-axis direction when the auxiliary body 200 is assembled to the base member 100 are provided, respectively. ing. The wall portion 223 is provided between the first support portion 221 and the second support portion 222, and connects the first support portion 221 and the second support portion 222. When the wall portion 223 is viewed along the optical axis L direction with the auxiliary body 200 assembled to the base member 100, the wall portion 223 is on the side H11 side of the base main body portion 110 in the first support portion 221 and the second support portion 222. The ends of the are connected to each other.

Next, a state in which the auxiliary body 200 is assembled to the base member 100 will be described. As shown in FIGS. 5 to 7, the auxiliary body 200 is arranged so as to be overlapped on one surface of the base member 100 in the optical axis L direction. The auxiliary body 200 is arranged in a region between the opening 110a and the side H11 on the surface of the base main body 110 when viewed along the optical axis L direction. The end of the auxiliary body 200 on the side where the X-axis friction engaging portion 240 is provided is located near the corner portion where the side H11 and the side H14 are connected. The end of the auxiliary body 200 on the side where the Y-axis actuator support portion 220 is provided is located near the corner portion where the side H11 and the side H13 are connected.

The X-axis friction engaging portion 240 comes into contact with the X-axis drive shaft 132 via the metal plate 241. The X-axis friction engaging portion 240 abuts on the X-axis drive shaft 132 so as to sandwich the X-axis drive shaft 132 with the X-axis actuator support portion 120. The tip of the first urging portion 242 is in contact with the X-axis drive shaft 132 at a position between the first support portion 121 and the second support portion 122. The tip of the first urging portion 242 urges the X-axis drive shaft 132 in the direction of pressing the X-axis drive shaft 132 against the X-axis friction engaging portion 240. As a result, the X-axis drive shaft 132 is sandwiched between the tip of the first urging portion 242 and the X-axis friction engaging portion 240. That is, the X-axis friction engaging portion 240 is in a state of frictionally engaging with the X-axis drive shaft 132 via the metal plate 241.

With the auxiliary body 200 assembled to the base member 100, the surface of the Y-axis actuator support portion 220 on the base main body 110 side is in contact with the protrusion T11 provided on the base main body 110 (see FIG. 7). ). By sandwiching the X-axis drive shaft 132 between the X-axis friction engaging portion 240 and the first urging portion 242, the auxiliary body 200 is in a state of being movably supported by the base member 100 in the X-axis direction. That is, one end of the auxiliary body 200 is supported by the base member 100 via the X-axis actuator 130, and the other end is supported by the base member 100 by the protrusion T11.

With the X-axis friction engaging portion 240 frictionally engaged with the X-axis drive shaft 132, the X-axis piezoelectric element 131 expands and contracts in the X-axis direction, so that the auxiliary body 200 moves in the X-axis direction with respect to the base member 100. Can be moved.

As shown in FIGS. 6 and 7, the auxiliary body 200 is provided with a Y-axis actuator 230. The Y-axis actuator 230 is an actuator that constitutes a smooth impact drive mechanism. The Y-axis actuator 230 includes a prismatic Y-axis piezoelectric element 231, a Y-axis drive shaft 232, and a weight portion 233.

The Y-axis piezoelectric element 231 is an element that can expand and contract in the Y-axis direction. The Y-axis piezoelectric element 231 is made of a piezoelectric material. The material and shape of the Y-axis piezoelectric element 231 are the same as those of the X-axis piezoelectric element 131, and detailed description thereof will be omitted.

The Y-axis drive shaft 232 is formed in a cylindrical shape, and is arranged so that the cylindrical axis extends along the Y-axis direction. The Y-axis drive shaft 232 is made of a composite resin material containing fibers such as carbon fiber.

One end of the Y-axis drive shaft 232 in the Y-axis direction is fixed to one end of the Y-axis piezoelectric element 231 in the Y-axis direction. Both ends of the Y-axis drive shaft 232 are housed in the groove 221a of the first support portion 221 and the groove 222a of the second support portion 222, respectively. The tip of the wall portion 223 in the rising direction supports the Y-axis drive shaft 232 from the side H11 side of the base main body portion 110 when viewed along the optical axis L direction.

The weight portion 233 is fixed to the other end portion of the Y-axis piezoelectric element 231 in the Y-axis direction. The material and function of the weight portion 233 are the same as those of the weight portion 133, and detailed description thereof will be omitted.

The weight portion 233 is fixed to the surface of the auxiliary body main body 210 facing the Y-axis actuator support portion 220. As a result, the Y-axis actuator 230 is in a state of being fixed to the auxiliary body main body 210 while the Y-axis drive shaft 232 is supported by the Y-axis actuator support portion 220.

The Y-axis actuator 230 is arranged so that the Y-axis drive shaft 232 side faces the outside when viewed along the L direction of the optical axis. That is, the end of the Y-axis actuator 230 on the Y-axis drive shaft 232 side faces away from the lens carrier 400 (see FIG. 15 and the like).

As shown in FIG. 7, the optical axis L passes through the auxiliary body 200 when viewed along the X-axis direction. Further, the X-axis actuator 130 and the Y-axis actuator 230 are provided at positions facing each other across the optical axis L when viewed along the X-axis direction.

Next, the details of the configuration of the movable body 300 will be described. As shown in FIG. 8, the movable body 300 includes a movable body main body portion 310, a first side wall portion 311, a second side wall portion 312, a third side wall portion 313, a fourth side wall portion 314, a raised portion 315, and an overhanging portion. It includes 316 and a Y-axis friction engaging portion 340.

The movable body main body 310 is formed in a substantially rectangular plate shape having four corners when viewed along the optical axis L direction. For convenience of explanation, the four sides constituting the outer peripheral edge of the movable body main body 310 when viewed along the optical axis L direction are referred to as side H31, side H32, side H33, and side H34, respectively. The movable body main body 310 is provided with a circular opening (second opening) 310a centered on the optical axis L (through which the optical axis L passes). The diameter of the opening 310a provided in the movable body main body 310 is smaller than the diameter of the opening 110a provided in the base member 100 (see FIG. 17).

As shown in FIGS. 8 and 9, the side H31 of the base member 100 with respect to the opening 310a when viewed along the optical axis L direction in a state where the movable body 300 is overlapped with the base member 100. It is a side located on the side H11 side. Similarly, the side H32 is a side located on the side H12 side of the base member 100 with respect to the opening 310a. The side H33 is a side located on the side H13 side of the base member 100 with respect to the opening 310a. The side H34 is a side located on the side H14 side of the base member 100 with respect to the opening 310a.

As shown in FIG. 8, the first side wall portion 311 is located on the side of the movable body main body 310 where the lens carrier 400 is arranged from the movable body main body 310 at the corner where the side H31 and the side H34 are connected. Standing up towards. The second side wall portion 312 stands up from the movable body main body 310 toward the side where the lens carrier 400 is arranged at the corner portion where the side H32 and the side H34 of the movable body main body 310 are connected. The second side wall portion 312 extends a predetermined length from the corner portion where the side H32 and the side H34 are connected toward the first side wall portion 311 side.

The third side wall portion 313 rises from the movable body main body 310 toward the side where the lens carrier 400 is arranged at the corner portion where the side H32 and the side H33 of the movable body main body 310 are connected. The fourth side wall portion 314 stands up from the movable body main body 310 toward the side where the lens carrier 400 is arranged at the corner portion where the side H33 and the side H31 of the movable body main body 310 are connected. The overhanging portion 316 is provided at the tip end portion of the fourth side wall portion 314 in the rising direction. The overhanging portion 316 projects outward from the tip end portion of the fourth side wall portion 314 (the side away from the opening 310a).

An actuator holding portion 310b that is recessed in a rectangular shape is provided on the surface of the movable body main body 310 on the side where the lens carrier 400 is arranged. The actuator holding portion 310b is located near the corner portion where the side H32 and the side H34 are connected.

The raised portion 315 is provided in the vicinity of the side H33 on the surface of the movable body main body 310 on the side where the lens carrier 400 is arranged. In the raised portion 315, the top of the raised portion extends along the X-axis direction. The raised portion 315 protrudes from the movable body main body portion 310 so that the cross section in the Y-axis direction has a substantially arc shape. A flat portion may be provided on the top of the ridge of the ridge 315.

The Y-axis friction engaging portion 340 is provided on the overhanging portion 316. The Y-axis friction engaging portion 340 is provided on the outer surface of the overhanging portion 316 that faces the Y-axis actuator 230 side when the movable body 300 is assembled to the base member 100 and the auxiliary body 200 (FIG. FIG. 10). The Y-axis friction engaging portion 340 is formed in a substantially V-shaped groove extending along the Y-axis direction when the movable body 300 is assembled to the base member 100 (see FIGS. 10 and 11 and the like). A substantially V-shaped metal plate 341 is attached to the Y-axis friction engaging portion 340. The Y-axis friction engaging portion 340 comes into contact with the Y-axis drive shaft 232 via the metal plate 341.

A second urging portion 342 is attached to the overhanging portion 316. The second urging portion 342 is an elastic member. One end of the second urging portion 342 is fixed to the overhanging portion 316. The other end (tip) of the second urging portion 342 faces the Y-axis friction engaging portion 340.

A protrusion T31 is provided on the overhanging portion 316. The protrusion T31 is provided on the surface of the overhanging portion 316 opposite to the side on which the Y-axis friction engaging portion 340 is provided. The protrusion T31 and the overhanging portion 316 are integrally provided. The protrusion T31 may be, for example, hemispherical or may have a convex shape with a flat top. The protrusion T31 comes into contact with the inner surface of the cover 3 when the movable body 300 is lifted from the base main body 110.

The side H33 of the movable body main body 310 is provided with a recess H33a that is recessed toward the opening 310a.

Next, a state in which the movable body 300 is assembled to the base member 100 and the auxiliary body 200 will be described. As shown in FIGS. 8 to 12, the movable body 300 is arranged so as to be overlapped with the base main body 110 on the same side as the auxiliary body 200. The movable body 300 is stacked on the surface of the base main body 110 so that the opening 310a and the opening 110a of the base main body 110 communicate with each other when viewed along the optical axis L direction. The auxiliary body 200 and the movable body 300 are arranged on the same surface of the base main body 110 and are adjacent to each other. As shown in FIG. 9, when viewed along the optical axis L direction, the auxiliary body 200 and the movable body 300 do not overlap each other. However, the overhanging portion 316 of the movable body 300 overlaps with the auxiliary body 200 in order to engage the Y-axis friction engaging portion 340 with the Y-axis drive shaft 232.

The Y-axis friction engaging portion 340 comes into contact with the Y-axis drive shaft 232 via the metal plate 341. The Y-axis friction engaging portion 340 abuts on the Y-axis drive shaft 232 so as to sandwich the Y-axis drive shaft 232 with the Y-axis actuator support portion 220. The tip of the second urging portion 342 is in contact with the Y-axis drive shaft 232 at a position between the first support portion 221 and the second support portion 222. The tip of the second urging portion 342 urges the Y-axis drive shaft 232 in the direction of pressing the Y-axis drive shaft 232 against the Y-axis friction engaging portion 340. As a result, the Y-axis drive shaft 232 is sandwiched between the tip of the second urging portion 342 and the Y-axis friction engaging portion 340. That is, the Y-axis friction engaging portion 340 is in a state of frictionally engaging with the Y-axis drive shaft 232 via the metal plate 341.

With the movable body 300 assembled to the base member 100 and the auxiliary body 200, the surface of the movable body main body 310 on the base main body 110 side comes into contact with the protrusions T12 and T13 provided on the base main body 110. There is. By sandwiching the Y-axis drive shaft 232 between the Y-axis friction engaging portion 340 and the second urging portion 342, the movable body 300 is supported by the base member 100 and the auxiliary body 200 so as to be movable in the Y-axis direction. It becomes a state. That is, in the movable body 300, the side provided with the Y-axis friction engaging portion 340 is supported by the auxiliary body 200 via the Y-axis actuator 230, and the side opposite to the side provided with the X-axis friction engaging portion 240 is. It is supported by the base member 100 by the protrusions T12 and T13.

With the Y-axis friction engaging portion 340 frictionally engaged with the Y-axis drive shaft 232, the Y-axis piezoelectric element 231 expands and contracts in the Y-axis direction, so that the movable body 300 moves in the Y-axis direction with respect to the auxiliary body 200. Can be moved.

Since the Y-axis friction engaging portion 340 is engaged with the Y-axis drive shaft 232, the movable body 300 moves together with the auxiliary body 200 in the X-axis direction. Therefore, the auxiliary body 200 moves in the X-axis direction with respect to the base member 100, and the movable body 300 moves in the Y-axis direction with respect to the auxiliary body 200, so that the movable body 300 moves with respect to the base member 100. It moves in the X-axis direction and the Y-axis direction.

As shown in FIG. 9, when viewed along the optical axis L direction, a part of the stopper portion 112 is inserted in the recess H33a. The wall surface of the recess H33a and the outer surface of the stopper 112 face each other in the Y-axis direction. Further, the wall surface of the recess H33a and the outer surface of the stopper portion 112 face each other in the X-axis direction. In the side wall portion on the side H34 side of the auxiliary body main body portion 210, the portion of the X-axis actuator support portion 120 facing the second support portion 122 is referred to as the stopper portion H34a.

When the movable body 300 moves away from the stopper portion 112 along the Y-axis direction, the stopper portion H34a comes into contact with the second support portion 122. When the auxiliary body 200 moves in the direction approaching the stopper portion 112 along the Y-axis direction, the wall surface of the recess H33a comes into contact with the stopper portion 112. That is, the stopper portion 112 and the second support portion 122 function as a stopper mechanism that regulates the movement range of the auxiliary body 200 in the Y-axis direction. When the auxiliary body 200 moves along the X-axis direction, the wall surface of the recess H33a comes into contact with the stopper portion 112. That is, the stopper portion 112 functions as a stopper mechanism that regulates the movement range of the auxiliary body 200 in the X-axis direction.

The base member 100 is provided with a pressing member 150. One end of the presser member 150 is fixed to the base body 110, and the other end (tip) abuts on the top of the raised portion 315. The pressing member 150 is an elastic member. The tip portion of the pressing member 150 urges the raised portion 315 toward the base main body portion 110 side. As a result, the movable body 300 is prevented from being lifted from the base main body 110. Since the Y-axis friction engaging portion 340 is in contact with the Y-axis drive shaft 232, it is possible to prevent the end portion of the auxiliary body 200 on the Y-axis actuator support portion 220 side from being lifted from the base main body portion 110. As a result, the auxiliary body 200 and the movable body 300 are prevented from being lifted from the base main body 110.

As shown in FIGS. 9 and 10, a Z-axis actuator 330 is attached to the movable body 300. The Z-axis actuator 330 is an actuator that constitutes a smooth impact drive mechanism. The Z-axis actuator 330 includes a prismatic Z-axis piezoelectric element 331, a Z-axis drive shaft 332, and a weight portion 333.

The Z-axis piezoelectric element 331 is an element that can expand and contract in the Z-axis direction. The Z-axis piezoelectric element 331 is made of a piezoelectric material. The material and shape of the Z-axis piezoelectric element 331 are the same as those of the X-axis piezoelectric element 131, and detailed description thereof will be omitted.

The Z-axis drive shaft 332 is formed in a cylindrical shape, and is arranged so that the cylindrical axis extends along the Z-axis direction. The Z-axis drive shaft 332 is made of a composite resin material containing fibers such as carbon fiber.

One end of the Z-axis drive shaft 332 in the Z-axis direction is fixed to one end of the Z-axis piezoelectric element 331 in the Z-axis direction. The weight portion 333 is fixed to the other end portion of the Z-axis piezoelectric element 331 in the Z-axis direction. The material and function of the weight portion 333 are the same as those of the weight portion 133, and detailed description thereof will be omitted.

The Z-axis actuator 330 is held by the movable body 300 by fitting and fixing the weight portion 333 to the actuator holding portion 310b provided on the movable body main body portion 310. The Z-axis actuator 330 faces the auxiliary body 200 via the lens carrier 400.

Next, the details of the configuration of the lens carrier 400 will be described. As shown in FIGS. 13 and 14, the lens carrier 400 includes a carrier main body portion 410, a rotation stop convex portion 420, a third urging portion 430, and a Z-axis friction engaging portion 440.

The carrier main body 410 is provided with a circular opening 410a centered on the optical axis L. The diameter of the opening 410a provided in the carrier main body 410 is smaller than the diameter of the opening 310a provided in the movable body 300 (see FIG. 17). A lens 4 can be attached to the opening 410a of the carrier main body 410. That is, the wall surface of the opening 410a serves as a lens mounting portion for mounting the lens 4 (FIG. 1). The lens 4 may be a lens unit composed of a plurality of lenses, or may be a single lens.

The rotation stop convex portion 420 projects from the outer peripheral surface of the carrier main body portion 410 along the direction orthogonal to the optical axis L.

The Z-axis friction engaging portion 440 is provided on the outer peripheral surface of the carrier main body portion 410. The Z-axis friction engaging portion 440 is provided at a position substantially opposite to the rotation stop convex portion 420 with the optical axis L interposed therebetween. The Z-axis friction engaging portion 440 is formed in a substantially V-shaped groove extending along the Z-axis direction when the lens carrier 400 is assembled to the movable body 300. A substantially V-shaped metal plate 441 is attached to the Z-axis friction engaging portion 440. The Z-axis friction engaging portion 440 comes into contact with the Z-axis drive shaft 332 via the metal plate 441.

The third urging portion 430 is attached to the outer peripheral surface of the carrier main body portion 410. The third urging portion 430 is an elastic member. One end of the third urging portion 430 is fixed to the carrier body portion 410. The other end (tip) of the third urging portion 430 faces the Z-axis friction engaging portion 440.

Next, a state in which the lens carrier 400 is assembled to the movable body 300 will be described. As shown in FIGS. 15 and 16, the lens carrier 400 is overlapped with respect to the movable body 300 on the side opposite to the side where the base member 100 is provided (the side on which the base member 100 overlaps) in the optical axis L direction. Have been placed. The lens carrier 400 is superposed on the surface of the movable body main body 310 so that the opening 410a and the opening 310a of the movable body 300 communicate with each other when viewed along the optical axis L direction.

The carrier main body 410 is surrounded by a first side wall 311, a second side wall 312, a third side wall 313, and a fourth side wall 314. As a result, the lens carrier 400 is restricted from moving in the X-axis direction and the Y-axis direction with respect to the movable body 300. The lens carrier 400 is held by the movable body 300 so as to be movable in the optical axis L direction. As shown in FIG. 16, the lens carrier 400 and the auxiliary body 200 do not overlap each other when viewed along the L direction of the optical axis. The Z-axis actuator 330 faces the auxiliary body 200 via the lens carrier 400.

The opening 110a of the base member 100 is provided at a position closer to the side H12 than the side H11. Therefore, when viewed along the optical axis L direction, the lens carrier 400 has an end portion (the other end portion) on the side H12 side of the base member 100 on the side H11 side end portion (one end portion). It is located near. Further, the auxiliary body 200 is arranged at a position closer to the end portion (one end portion) on the side H11 side than the end portion (the other end portion) on the side H12 side of the base member 100.

The rotation stop convex portion 420 is located between the first side wall portion 311 and the fourth side wall portion 314 in the Y-axis direction. Since the rotation stop convex portion 420 is located between the first side wall portion 311 and the fourth side wall portion 314, the lens carrier 400 is prevented from rotating about the optical axis L.

The Z-axis friction engaging portion 440 comes into contact with the Z-axis drive shaft 332 via the metal plate 441. The third urging portion 430 faces the auxiliary body 200 via the carrier main body portion 410. The tip of the third urging portion 430 is in contact with the Y-axis drive shaft 232. The tip of the third urging portion 430 urges the Z-axis drive shaft 332 in the direction of pressing the Z-axis drive shaft 332 against the Z-axis friction engaging portion 440. As a result, the Z-axis drive shaft 332 is sandwiched between the tip of the third urging portion 430 and the Z-axis friction engaging portion 440. That is, the Z-axis friction engaging portion 440 is in a state of frictionally engaging with the Z-axis drive shaft 332 via the metal plate 441.

With the Z-axis friction engaging portion 440 frictionally engaged with the Z-axis drive shaft 332, the Z-axis piezoelectric element 331 expands and contracts in the Z-axis direction, so that the lens carrier 400 moves in the Z-axis direction with respect to the movable body 300. Can be moved.

Next, the details of the frame member 500 will be described. As shown in FIG. 1, the frame member 500 has a substantially square frame shape surrounding the lens carrier 400 when viewed along the optical axis L direction. The frame member 500 is attached to the tip portions of the first side wall portion 311, the second side wall portion 312, the third side wall portion 313, and the fourth side wall portion 314 provided on the movable body 300.

A Z-axis actuator support portion 510 that supports the Z-axis drive shaft 332 of the Z-axis actuator 330 is provided on the inner peripheral surface of the frame member 500. The Z-axis actuator support portion 510 is in contact with a portion of the outer peripheral surface of the Z-axis drive shaft 332 on the side far from the optical axis L when viewed along the optical axis L direction.

Next, a state in which the cover 3 is attached to the lens driving unit 2 will be described. As shown in FIGS. 1 and 16, the cover 3 covers the base main body 110 so as to internally accommodate the components other than the base member 100 among the components constituting the lens driving unit 2. The cover 3 is provided with an opening 3a centered on the optical axis L. The tip portions of the first strut portion 113 and the second strut portion 114 provided on the base member 100 abut on the inner surface of the cover 3 to support the cover 3.

Next, the electric wiring connected to each actuator, the sensor for detecting the position of the auxiliary body 200 and the like, and the electric wiring connected to each sensor will be described. First, the electrical wiring and the sensor provided on the base member 100 will be described. As shown in FIGS. 2 and 3, on the surface of the base main body 110 on the side where the movable body 300 and the like are arranged, the hall sensor HS1, the hall sensor HS2, the two electric wirings W11, and the two electric wirings. W12, two electric wires W13, four electric wires W21, four electric wires W22, and four electric wires W23 are provided.

One end of each of the two electrical wirings W11 is connected to the X-axis piezoelectric element 131 of the X-axis actuator 130, and the other end extends to the side H11 of the base main body 110. The electric wiring W11 supplies electric power to the X-axis piezoelectric element 131.

The two electric wirings W12 are provided in the vicinity of the side H11 in the base main body 110, respectively. One end of each of the two electrical wirings W12 is located near the side H11 of the base main body 110, and the other end extends to the side H11 of the base main body 110.

The two electrical wirings W13 are provided in the vicinity of the corner portion where the side H12 and the side H14 of the base main body 110 are connected. One end of each of the two electrical wirings W13 is located near the side H14 of the base main body 110, and the other end extends to the side H12 of the base main body 110.

Of the four electrical wirings W23, one end of each of the three electrical wirings W23 is located near the side H14 of the base main body 110, and the other end extends to the side H12 of the base main body 110. One end of the remaining one electric wiring W23 is located near the side H14 of the base main body 110, and the other end extends to the side H11 of the base main body 110.

The Hall sensor HS1 functions as a position sensor that detects the position of the auxiliary body 200 that moves with respect to the base member 100. The Hall sensor HS1 is provided in the vicinity of the side H11 of the base main body 110. One end of each of the four electric wirings W21 is connected to the hall sensor HS1. The other ends of the four electric wirings W21 extend to the side H11 of the base main body 110, respectively.

The Hall sensor HS2 functions as a position sensor that detects the position of the movable body 300 that moves with respect to the base member 100. The Hall sensor HS2 is provided in the vicinity of the corner portion where the side H12 and the side H13 of the base main body 110 are connected. One end of each of the four electric wirings W22 is connected to the hall sensor HS2. The other ends of the four electrical wirings W22 extend to the side H12 of the base main body 110, respectively.

Wiring such as a control circuit and a drive circuit is connected to each of the electrical wirings W11 to W13 and W21 to W23 at the end positions of the base main body 110.

Next, the electrical wiring and the like provided on the auxiliary body 200 will be described. As shown in FIG. 5, the auxiliary body 200 is provided with a magnet MG1 and two electric wirings W32. The magnet MG1 is attached to the surface of the auxiliary body main body 210 facing the base main body 110. As shown in FIG. 7 and the like, the Hall sensor HS1 provided on the base member 100 and the magnet MG1 face each other in the Z-axis direction. The Hall sensor HS1 detects the position of the auxiliary body 200 with respect to the base member 100 based on the change in the magnetic field of the magnet MG1 moving together with the auxiliary body 200. The X-axis actuator 130 is feedback-controlled based on the detection result of the Hall sensor HS1.

One end of the two electric wirings W32 is connected to the Y-axis piezoelectric element 231 of the Y-axis actuator 230. The other ends of the two electric wires W32 are connected to one ends of the two suspension wires SW12, respectively. The suspension wire SW12 is an elastic member having conductivity. As shown in FIG. 6, the other ends of the two suspension wires SW12 are connected to the other ends of the electric wiring W12, respectively. Electric power is supplied to the Y-axis piezoelectric element 231 via the electric wiring W12 provided in the base main body 110, the suspension wire SW12, and the electric wiring W32 provided in the auxiliary body 200.

Next, the electrical wiring and the like provided on the movable body 300 will be described. As shown in FIG. 8, the movable body 300 is provided with a magnet MG2, a hall sensor HS3, four electric wirings W33, and two electric wirings W43.

The magnet MG2 is provided at a corner portion on the third side wall portion 313 side of the movable body main body portion 310. As shown in FIG. 11 and the like, the Hall sensor HS2 provided on the base member 100 and the magnet MG2 face each other in the Z-axis direction. The Hall sensor HS2 detects the position of the movable body 300 with respect to the base member 100 based on the change in the magnetic field of the magnet MG2 that moves together with the movable body 300. The Y-axis actuator 230 is feedback-controlled based on the detection result of the Hall sensor HS2.

As shown in FIG. 8, the Hall sensor HS3 functions as a position sensor that detects the position of the lens carrier 400 that moves in the Z-axis direction with respect to the movable body 300. The Hall sensor HS3 is provided on the surface of the second side wall portion 312 on the L side of the optical axis. One end of each of the four electric wirings W33 is connected to the hall sensor HS3. The other ends of the four electric wirings W33 extend from the movable body main body 310 to the tip (top) of the second side wall 312 rising from the movable body main body 310.

As shown in FIGS. 2 and 12, one end of the four electric wires W23 provided on the base member 100 and the other end of the four electric wires W33 provided on the movable body 300 are four. They are connected by suspension wires SW23. The suspension wire SW23 is an elastic member having conductivity.

As shown in FIGS. 8 and 10, one end of each of the two electric wirings W43 is connected to the Z-axis piezoelectric element 331 of the Z-axis actuator 330, and the other end extends to the tip of the second side wall portion 312. ing.

As shown in FIGS. 2 and 12, one end of the two electric wires W13 provided on the base member 100 and the other end of the two electric wires W43 provided on the movable body 300 are two. They are connected by suspension wires SW13, respectively. The suspension wire SW13 is an elastic member having conductivity. Electric power is supplied to the Z-axis piezoelectric element 331 via the electric wiring W13 provided in the base main body 110, the suspension wire SW13, and the electric wiring W43 provided in the movable body 300.

Next, the lens carrier 400 will be described. As shown in FIG. 14, the lens carrier 400 is provided with a magnet MG3. The magnet MG3 is provided at a position near the Z-axis friction engaging portion 440 on the outer peripheral surface of the carrier main body portion 410. As shown in FIG. 16 and the like, the Hall sensor HS3 provided on the second side wall portion 312 of the movable body 300 and the magnet MG3 face each other in the Y-axis direction. The Hall sensor HS3 detects the position of the lens carrier 400 with respect to the movable body 300 based on the change in the magnetic field of the magnet MG3 that moves together with the lens carrier 400. The Z-axis actuator 330 is feedback-controlled based on the detection result of the Hall sensor HS3.

As described above, in the lens driving device 1, the X-axis actuator 130 moves the auxiliary body 200 with respect to the base member 100 in the X-axis direction. The Y-axis actuator 230 moves the movable body 300 in the Y-axis direction with respect to the auxiliary body 200. As a result, the movable body 300 (lens carrier 400) is moved with respect to the base member 100 in the X-axis direction and the Y-axis direction, and the camera shake correction function is realized. Since the auxiliary body 200 and the lens carrier 400 do not overlap in the optical axis direction, the height of the lens driving device 1 (the size in the optical axis L direction) is larger than that in the case where the auxiliary body 200 overlaps the lens carrier 400. It becomes smaller. As a result, the lens driving device 1 can be made low in height.

The auxiliary body 200 extends along the Y-axis direction. In this case, since the auxiliary body 200 does not extend in the X-axis direction, the lens driving device 1 can reduce the size in the X-axis direction.

The end of the X-axis actuator 130 on the X-axis drive shaft 132 side faces away from the lens carrier 400. As a result, the X-axis friction engaging portion 240 and the first urging portion 242 that sandwich the X-axis drive shaft 132 can be separated from the lens carrier 400. That is, the lens driving device 1 can secure the installation space for the X-axis friction engaging portion 240 and the first urging portion 242 while suppressing the restrictions imposed by the lens carrier 400.

The end of the Y-axis actuator 230 on the Y-axis drive shaft 232 side faces away from the lens carrier 400. As a result, the Y-axis friction engaging portion 340 and the second urging portion 342 that sandwich the Y-axis drive shaft 232 can be separated from the lens carrier 400. That is, the lens driving device 1 can secure the installation space of the Y-axis friction engaging portion 340 and the second urging portion 342 while suppressing the restrictions imposed by the lens carrier 400.

As shown in FIG. 7, the X-axis actuator 130 and the Y-axis actuator 230 are provided at positions facing each other across the optical axis L when viewed along the X-axis direction. Generally, the lens 4 has a circular shape. Therefore, the lens carrier 400 also has a substantially annular shape along the lens 4. As a result, the distance between the auxiliary body 200 and the lens carrier 400 becomes wider at a position away from the optical axis L than near the optical axis L when viewed along the X-axis direction. When viewed along the X-axis direction, the X-axis actuator 130 and the Y-axis actuator 230 are provided at positions facing each other with the optical axis L in between, so that the lens driving device 1 can be the X-axis actuator 130 and the X-axis actuator 130. The Y-axis actuator 230 can be arranged in a portion where the distance between the auxiliary body 200 and the lens carrier 400 is wide. As a result, the lens driving device 1 can arrange the X-axis actuator 130 and the Y-axis actuator 230 at appropriate positions while suppressing the increase in size of the device.

The lens carrier 400 is arranged at a position closer to the side H12 side of the base member 100. In this case, the auxiliary body 200 is installed in the space (side H11 side of the base member 100) vacated by the lens carrier 400 being arranged eccentrically. As a result, the lens driving device 1 can arrange the auxiliary body 200 and the lens carrier 400 at appropriate positions while suppressing the increase in size of the device.

The lens driving device 1 includes a Z-axis actuator 330 that moves the lens carrier 400. As a result, the lens driving device 1 can realize the focusing function of the lens 4.

The Z-axis actuator 330 faces the auxiliary body 200 via the lens carrier 400. In this case, the lens driving device 1 can secure the installation space of the Z-axis actuator 330 while suppressing the restrictions imposed by the X-axis actuator 130, the Y-axis actuator 230, and the like provided around the auxiliary body 200.

The third urging portion 430 faces the auxiliary body 200 via the carrier main body portion 410. In this case, the lens driving device 1 can secure the installation space of the third urging portion 430 while suppressing the restrictions imposed by the X-axis actuator 130, the Y-axis actuator 230, and the like provided around the auxiliary body 200.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, the base main body 110 may have a substantially square plate shape. The base main body 110 does not have to have a substantially rectangular plate shape. Although the lens carrier 400 is arranged at a position closer to one end side of the base member 100, the lens carrier 400 may be arranged at the center of the base main body 110. Although the auxiliary body 200 is a rod-shaped member extending in the Y-axis direction, it does not have to be a rod-shaped member. The X-axis actuator 130, the Y-axis actuator 230, and the Z-axis actuator 330 may be a mechanism other than the mechanism using the piezoelectric element. The X-axis friction engaging portion 240 may come into direct contact with the X-axis drive shaft 132 without passing through the metal plate 241. Similarly, the Y-axis friction engaging portion 340 and the Z-axis friction engaging portion 440 may directly contact the Y-axis drive shaft 232 and the Z-axis drive shaft 332, respectively, without passing through the metal plates 341 and 441. Further, although the hall sensors HS1 to HS3 are used as the position sensors for detecting the position of the auxiliary body 200 or the like, a position sensor other than the hall sensor may be used.

1 ... Lens drive device, 4 ... Lens, 100 ... Base member, 110a ... Opening (first opening), 130 ... X-axis actuator (first actuator), 131 ... X-axis piezoelectric element, 132 ... X-axis drive shaft , 200 ... Auxiliary body, 240 ... X-axis friction engaging part, 242 ... First biasing part, 230 ... Y-axis actuator (second actuator), 231 ... Y-axis piezoelectric element, 232 ... Y-axis drive shaft, 300 ... Movable body, 310a ... Opening (second opening), 340 ... Y-axis friction engaging part, 342 ... Second urging part, 330 ... Z-axis actuator (third actuator), 331 ... Z-axis piezoelectric element, 332 ... Z-axis drive shaft, 400 ... Lens carrier, 410 ... Carrier body, 430 ... Third urging unit, 440 ... Z-axis friction actuator, L ... Optical axis.

Claims (7)

It is a lens driving device that drives a lens.
A base member having a first opening through which the optical axis of the lens passes, and
Auxiliary bodies arranged so as to overlap the base member in the optical axis direction of the lens,
A first actuator provided on the base member and moving the auxiliary body with respect to the base member,
A movable body having a second opening through which the optical axis passes and being arranged so as to be overlapped on the same side as the auxiliary body with respect to the base member.
A second actuator provided on the auxiliary body and moving the movable body with respect to the auxiliary body,
A lens carrier that is held by the movable body and to which the lens can be attached,
With
The first actuator moves the auxiliary body in the X-axis direction orthogonal to the optical axis direction.
The second actuator moves the movable body in the Y-axis direction orthogonal to the optical axis direction and the X-axis direction.
The auxiliary body and the lens carrier do not overlap each other when viewed along the optical axis direction.
When viewed along the X-axis direction, the optical axis passes through the auxiliary body.
The first actuator and the second actuator are lens driving devices provided at positions facing each other with the optical axis interposed therebetween when viewed along the X-axis direction. It is a lens driving device that drives a lens.
A base member having a first opening through which the optical axis of the lens passes, and
Auxiliary bodies arranged so as to overlap the base member in the optical axis direction of the lens,
A first actuator provided on the base member and moving the auxiliary body with respect to the base member,
A movable body having a second opening through which the optical axis passes and being arranged so as to be overlapped on the same side as the auxiliary body with respect to the base member.
A second actuator provided on the auxiliary body and moving the movable body with respect to the auxiliary body,
A lens carrier that is held by the movable body and to which the lens can be attached,
With
The first actuator moves the auxiliary body in the X-axis direction orthogonal to the optical axis direction.
The second actuator moves the movable body in the Y-axis direction orthogonal to the optical axis direction and the X-axis direction.
The auxiliary body and the lens carrier do not overlap each other when viewed along the optical axis direction.
A third actuator provided on the movable body and for moving the lens carrier in the optical axis direction with respect to the movable body is further provided.
The third actuator is a lens driving device that faces the auxiliary body via the lens carrier. The lens driving device according to claim 1 or 2 , wherein the auxiliary body extends along the Y-axis direction. The first actuator
The X-axis piezoelectric element that can expand and contract in the X-axis direction,
An X-axis drive shaft fixed to one end of the X-axis piezoelectric element in the X-axis direction,
Have,
The auxiliary body
An X-axis friction engaging portion that frictionally engages with the X-axis drive shaft,
A first urging portion that urges the X-axis drive shaft toward the X-axis friction engaging portion, and
Have,
The lens driving device according to any one of claims 1 to 3, wherein the end portion of the first actuator on the X-axis drive shaft side faces a side away from the lens carrier. The second actuator
The Y-axis piezoelectric element that can expand and contract in the Y-axis direction,
A Y-axis drive shaft fixed to one end of the Y-axis piezoelectric element in the Y-axis direction,
Have,
The movable body is
A Y-axis friction engaging portion that frictionally engages with the Y-axis drive shaft,
A second urging portion that urges the Y-axis drive shaft toward the Y-axis friction engaging portion, and
Have,
The lens driving device according to any one of claims 1 to 4 , wherein the end portion of the second actuator on the Y-axis drive shaft side faces a side away from the lens carrier. When viewed along the optical axis direction, the lens carrier is arranged closer to the other end than one end of the base member.
The lens driving device according to any one of claims 1 to 5, wherein the auxiliary body is arranged closer to the one end portion than the other end portion of the base member. The third actuator is
The Z-axis piezoelectric element that can expand and contract in the optical axis direction,
A Z-axis drive shaft fixed to one end of the Z-axis piezoelectric element in the optical axis direction,
Have,
The lens carrier is
The carrier body to which the lens can be attached and
A Z-axis friction engaging portion provided on the carrier main body and frictionally engaging with the Z-axis drive shaft, and a Z-axis friction engaging portion.
A third urging portion that urges the Z-axis drive shaft toward the Z-axis friction engaging portion, and a third urging portion.
Have,
The lens driving device according to claim 2 , wherein the third urging portion faces the auxiliary body via the carrier main body portion.

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