WO2022024922A1

WO2022024922A1 - Lens driving device and camera module

Info

Publication number: WO2022024922A1
Application number: PCT/JP2021/027314
Authority: WO
Inventors: 潤安藤; 幸徳黒木
Original assignee: アルプスアルパイン株式会社
Priority date: 2020-07-28
Filing date: 2021-07-21
Publication date: 2022-02-03
Also published as: CN116157716A; JPWO2022024922A1; JP7394229B2

Abstract

A lens driving device (101) is provided with: a fixed-side member (RG); a housing (HS) that has an outer peripheral wall (4A) and a ceiling (4B) and that constitutes the fixed-side member (RG); a lens holding member (2) that is disposed in the housing (HS) and that is capable of holding a lens body; a leaf spring (6) that supports the lens holding member (2) so as to be movable in an optical axis direction; and a driving mechanism (MK) for moving the lens holding member (2) in the optical axis direction. The lens holding member (2) has a storage part (2A) opened at an upper portion thereof. The housing (HS) has a folding piece (4T) that extends from the ceiling (4B) and that has a tip (ED) inserted in the storage part (2A). The storage part (2A) stores a damping material (DM). The tip (ED) of the folding piece (4T) is in contact with the damping material (DM).

Description

Lens drive and camera module

The present disclosure relates to a lens driving device mounted on, for example, a portable device with a camera.

Conventionally, a lens holder drive device (lens drive device) including a lens holder (lens holding member) and a coil arranged on the outer periphery of the lens holding member is known (see Patent Document 1). In this device, the lens holding member is movably held in a direction parallel to the optical axis of the lens (hereinafter referred to as "optical axis direction") by a pair of leaf springs arranged above and below the lens holding member.

Further, in this device, in order to solve the problem that the lens holding member vibrates unnecessarily due to external vibration or impact, the U-turn-shaped portion of the lower leaf spring is formed on a portion facing each other. An elastic adhesive (vibration damping material) is provided so as to straddle.

Japanese Unexamined Patent Publication No. 2016-004108

However, the damping material provided as described above may fall off from the leaf spring.

Therefore, it is desirable to provide a lens driving device that can prevent the damping material from falling off in order to suppress the vibration of the lens holding member.

The lens driving device according to the embodiment of the present invention includes a fixed-side member, a lens holding member capable of holding a lens body, a support member that movably supports the lens holding member in the optical axis direction, and the lens holding member. In a lens driving device including a drive mechanism for moving the lens in the optical axis direction, the lens holding member has an accommodating portion whose upper portion is open, and the fixed side member has a tip portion inserted into the accommodating portion. A vibration damping material is housed in the accommodating portion, and the tip end portion of the projecting portion is in contact with the vibration damping material provided in the accommodating portion.

The above-mentioned lens drive device can prevent the damping material from falling off.

It is an exploded perspective view of a lens drive device. It is an upper perspective view of the lens drive device. It is a front view of the lens drive device. It is a top view of the lens drive device. It is a bottom view of a lens drive device. It is an upper perspective view of the lens driving device in a state where a spacer and a yoke are removed. It is a front view of the lens driving device in a state where a spacer and a yoke are removed. It is an upper perspective view of the lens holding member in which a coil is not wound. It is an upper perspective view of the lens holding member around which a coil is wound. It is a lower perspective view of the lens holding member in which a coil is not wound. It is a lower perspective view of the lens holding member around which a coil is wound. It is a top view of the lens holding member in which a coil is not wound. It is a top view of the lens holding member around which a coil is wound. It is a right side view of a lens holding member in which a coil is not wound. It is a right side view of the lens holding member around which a coil is wound. It is a left side view of the lens holding member in which a coil is not wound. It is a left side view of the lens holding member around which a coil is wound. It is an enlarged view of a part of a lens holding member. It is an enlarged view of a part of a lens holding member. It is a bottom view of the lens drive device in a state where some members are removed. It is a bottom view of the lens drive device in a state where some members are removed. It is a top view of the upper leaf spring. It is a bottom view of the lower leaf spring. It is a figure explaining the connection structure of a leaf spring and a coil in a lens drive device. It is a figure explaining the connection structure of a leaf spring and a coil in a lens drive device. It is an upper perspective view of the base member which does not include a terminal member. It is an upper perspective view of the terminal member embedded in a base member. It is an upper perspective view of the base member including a terminal member. It is the upper perspective view of the base member in the state which the lower leaf spring is assembled. It is a perspective view of the 1st bending piece when the 1st damping material is not accommodated (applied) in the 1st accommodating part. It is a perspective view of the 1st bending piece when the 1st damping material is accommodated (applied) in the 1st accommodating part. FIG. 14B is a cross-sectional view of a lens driving device in a vertical plane including the alternate long and short dash line shown in FIG. 14B. It is a top view of the whole lens holding member to which the upper leaf spring is attached. It is an enlarged view of the range surrounded by the broken line shown in FIG. 15A. It is an enlarged view of the range surrounded by the broken line shown in FIG. 7A. It is an enlarged view of the range surrounded by the broken line shown in FIG. 3A. It is sectional drawing of the lens driving device.

Hereinafter, the lens driving device 101 according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the lens driving device 101. 2A is an upward perspective view of the lens driving device 101, and FIG. 2B is a front view of the lens driving device 101 as seen from the Y2 side. 3A is a top view of the lens driving device 101, and FIG. 3B is a bottom view of the lens driving device 101. FIG. 4A is an upward perspective view of the lens driving device 101 in a state where the spacer 1 and the cover member 4 are removed, and corresponds to FIG. 2A. FIG. 4B is a front view of the lens driving device 101 with the spacer 1 and the cover member 4 removed.

Note that X1 represents one direction of the X axis constituting the three-dimensional Cartesian coordinate system, and X2 represents the other direction of the X axis. Further, Y1 represents one direction of the Y axis constituting the three-dimensional Cartesian coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional Cartesian coordinate system, and Z2 represents the other direction of the Z axis. In this embodiment, the optical axis JD extends parallel to the Z axis. The Y1 side of the lens driving device 101 corresponds to the rear side (rear side) of the lens driving device 101, and the Y2 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101. Further, the X1 side of the lens driving device 101 corresponds to the right side of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the left side of the lens driving device 101. The same applies to other figures.

As shown in FIG. 1, the lens driving device 101 includes a lens holding member 2 capable of holding a lens body (not shown) and a driving mechanism MK capable of moving the lens holding member 2 along the optical axis direction. A leaf spring 6 that movably supports the lens holding member 2 in the optical axis direction, a fixed side member RG to which the leaf spring 6 is fixed, and a terminal member 7 that provides an electrical connection to the outside are included. The lens body is, for example, a cylindrical lens barrel including at least one lens. The optical axis direction includes the direction of the optical axis JD with respect to the lens body and the direction parallel to the optical axis JD.

As shown in FIG. 1, the drive mechanism MK includes a coil 3 wound in an octagonal ring shape, a cover member 4 also serving as an outer case provided with a rectangular tubular outer peripheral wall portion 4A, and a magnet 5. The magnet 5 includes a first magnet 5A and a second magnet 5B arranged to face the two sides of the coil 3.

The fixed side member RG includes a spacer 1, a cover member 4, and a base member 18 in which a terminal member 7 is embedded.

The leaf spring 6 includes an upper leaf spring 16 arranged between the lens holding member 2 and the cover member 4, and a lower leaf spring 26 arranged between the lens holding member 2 and the base member 18. The lower leaf spring 26 includes a first lower leaf spring 26A and a second lower leaf spring 26B.

The lens driving device 101 has a substantially rectangular parallelepiped outer shape, and is mounted on a substrate (not shown) on which an image sensor (not shown) is mounted. The substrate, the lens driving device 101, the lens body mounted on the lens holding member 2, and the image pickup element mounted on the substrate so as to face the lens body constitute a camera module. The coil 3 is connected to the power supply via the lower leaf spring 26, the terminal member 7, and the substrate. When a current flows through the coil 3, the drive mechanism MK generates an electromagnetic force along the optical axis direction.

The lens driving device 101 realizes an automatic focus adjustment function by using this electromagnetic force to move the lens holding member 2 along the optical axis direction on the Z1 side (subject side) of the image pickup element. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image sensor to enable macro photography, and moves the lens holding member 2 in a direction closer to the image sensor to enable infinity photography. I have to.

Next, the lens holding member 2 and the drive mechanism MK will be described. 5A is an upward perspective view of the lens holding member 2, and FIG. 5B is an upward perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 5A. 6A is a downward perspective view of the lens holding member 2, and FIG. 6B is a downward perspective view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 6A. 7A is a top view of the lens holding member 2, and FIG. 7B is a top view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 of FIG. 7A. FIG. 8A is a right side view of the lens holding member 2 as seen from the X1 side, and FIG. 8B is a right side view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 shown in FIG. 8A. Is. 8C is a left side view of the lens holding member 2 as seen from the X2 side, and FIG. 8D is a left side view of the lens holding member 2 showing a state in which the coil 3 is wound around the lens holding member 2 shown in FIG. 8C. Is. 9A is an enlarged view of a portion in the range R1 shown in FIG. 6B, and FIG. 9B is an enlarged view of a portion in the range R2 shown in FIG. 6B when viewed from the X2 side. FIG. 10A is a bottom view of the lens driving device 101 with the terminal member 7 and the base member 18 removed, and FIG. 10B further shows a first lower leaf spring 26A, a second lower leaf spring 26B, and a lens holding member. 2 is a bottom view of the lens driving device 101 in a state where 2 is removed.

In the present embodiment, the lens holding member 2 is manufactured by injection molding a synthetic resin such as a liquid crystal polymer (LCP). Specifically, as shown in FIG. 5A, the lens holding member 2 is formed on a cylindrical portion 12 formed so as to extend along the optical axis direction and on the image pickup element side (Z2 side) in the optical axis direction. Includes a flange portion (flange-shaped portion) 52. In the present embodiment, the upper half of the tubular portion 12 is formed in a substantially cylindrical shape.

The tubular portion 12 is formed with a thread groove on the inner peripheral surface so that the lens body can be mounted. Further, the cylindrical portion 12 is provided with pedestal portions 12d having recesses 12dh at four locations on the end surface on the subject side. Then, as shown in FIG. 4A, the inner portion 16i of the upper leaf spring 16 is placed on the pedestal portion 12d.

As shown in FIG. 5A, a coil support portion 12j as an outer wall portion that supports the coil 3 from the inside is provided on the outer peripheral surface of the tubular portion 12. In the present embodiment, the coil support portion 12j has an octagonal outer shape in the top view so as to support the octagonal annular coil 3 in the top view. On the subject side of the coil support portion 12j, eaves portions 12h projecting outward in the radial direction so as to face the flange portion 52 in the optical axis direction are formed at four locations. Then, as shown in FIG. 5B, the coil 3 is supported by the coil support portion 12j and is sandwiched between the eaves portion 12h and the flange portion 52 in the optical axis direction so as to be octagonal on the outer peripheral surface of the lens holding member 2. It is mounted in a ring shape.

The flange portion 52 protrudes radially outward from the end portion of the tubular portion 12 on the image sensor side (Z2 side). A coil 3 is arranged on the subject side of the flange portion 52. As shown in FIG. 6B, the flange portion 52 is formed with two notched portions 52k with the optical axis JD interposed therebetween. An extending portion 33, which is a part of the conductive wire rod constituting the coil 3, is passed through the cutout portion 52k. Specifically, an extending portion 33A, which is a part of the wire rod on the winding end side of the coil 3, is passed through one of the notch portions 52k, and one of the wire rods on the winding start side of the coil 3 is passed through the other of the cutout portion 52k. The extension portion 33B, which is a portion, is passed through. The edge portion of the flange portion 52 forming the notch portion 52k is configured to be rounded (not angular). This is to prevent disconnection of the wire rod constituting the coil 3 in contact with the edge portion.

As shown in FIG. 6A, the flange portion 52 has four round convex projecting portions 2t protruding downward (Z2 direction) from the surface on the image sensor side (Z2 side), and also downward (Z2 direction). Includes two protruding square protrusions 72.

As shown in FIG. 6B, the protruding portion 72 includes a protruding portion 72A corresponding to the winding end side of the coil 3 (winding portion 13) and a protruding portion 72B corresponding to the winding start side of the coil 3. That is, both ends of the wire rod constituting the coil 3 are wound and held around the two protrusions 72.

As shown in FIGS. 6A and 10A, the projecting portion 2t includes two projecting portions 2t corresponding to the two through holes 26r (see FIG. 11B) formed in the first lower leaf spring 26A, and the second projecting portion 2t. It includes two projecting portions 2t corresponding to two through holes 26r (see FIG. 11B) formed in the lower leaf spring 26B. Then, the inner portion 26i as the first support portion (movable side support portion) of each of the first lower leaf spring 26A and the second lower leaf spring 26B is mounted and fixed to the projecting portion 2t. The fixing of the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B is realized by heating the projecting portion 2t inserted into the through hole 26r formed in the inner portion 26i. .. In FIGS. 6A and 6B, the projecting portion 2t is shown in a state where the tip is deformed after being heat-caulked. The same applies to the other drawings illustrating the projecting portion 2t.

Next, the drive mechanism MK of the lens drive device 101 will be described. As shown in FIG. 10B, the drive mechanism MK includes a coil 3, a cover member 4, and a magnet 5. The magnet 5 includes a first magnet 5A and a second magnet 5B arranged to face two of the four sides of the cover member 4. Then, the drive mechanism MK generates a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5, and moves the lens holding member 2 up and down along the optical axis direction.

As shown in FIG. 6B, the coil 3 is formed by winding a conductive (metal) wire (conductor) around the outer periphery of the lens holding member 2. Specifically, the coil 3 includes a winding portion 13 as a coil main body portion formed by being wound in an octagonal ring shape, and an extending portion 33 extending from the winding portion 13 and wound around a protruding portion 72. In FIG. 6B, for the sake of clarity, the detailed winding state of the conductive wire rod whose surface is covered with the insulating member is omitted for the winding portion 13. That is, the winding portion 13 is shown in a simplified manner. The same applies to the other drawings illustrating the winding portion 13.

The extending portion 33 includes an extending portion 33A connected to an end portion (winding end portion) of the winding portion 13 located on the outer peripheral side of the winding portion 13 on the winding end side of the coil 3 and a winding start of the coil 3. The extension portion 33B connected to the end portion (winding start portion) of the winding portion 13 located on the inner peripheral side of the winding portion 13 on the side is included.

Specifically, as shown in FIG. 9B, the extending portion 33B includes a winding portion 33m wound around the protruding portion 72B and a facing portion 33c extending facing the bottom surface (the surface on the Z2 side) of the lens holding member 2. Includes an insertion portion 33k that is inserted through the notch portion 52k and extends from the image pickup element side (Z2 side) of the flange portion 52 to the subject side (Z1 side).

In the present embodiment, the extending portion 33B is wound around the protruding portion 72B of the lens holding member 2 before the wire rod constituting the coil 3 is wound around the coil supporting portion 12j (see FIG. 5A) of the lens holding member 2. .. In the example shown in FIG. 9B, a part of the wire rod constituting the coil 3 is wound around the protrusion 72B for 3 turns. As a result, the winding portion 33m is formed on the protruding portion 72B, and a part of the extending portion 33B is held by the protruding portion 72B. However, the extending portion 33B may be wound around the protruding portion 72B after the wire rod constituting the coil 3 is wound around the coil supporting portion 12j of the lens holding member 2.

Typically, after a part of the extending portion 33B is wound around the protruding portion 72B, the remaining portion of the wire rod constituting the coil 3 is wound around the coil supporting portion 12j of the lens holding member 2. At that time, as shown in FIG. 9B, a part of the extending portion 33B extending from the winding portion 33m extends from the lower side of the flange portion 52 to the upper side of the flange portion 52 through the notch portion 52k. At this time, the portion facing the bottom surface of the lens holding member 2 constitutes the facing portion 33c of the extending portion 33B, and the portion passing through the cutout portion 52k constitutes the insertion portion 33k of the extending portion 33B.

As shown in FIG. 5B, the winding portion 13 of the coil 3 wound around the coil supporting portion 12j of the lens holding member 2 is arranged at a position surrounding the periphery of the lens holding member 2. Further, the winding portion 13 is fixed to the subject side of the flange portion 52 so as to be sandwiched between the eaves portion 12h and the flange portion 52 in a state of being supported from the inside by the coil support portion 12j. Further, since the inner peripheral surface of the winding portion 13 is isotropically and well-balancedly supported by the coil supporting portion 12j, the central axis of the coil 3 and the central axis of the lens holding member 2 coincide with each other in the winding portion 13. In this state, it is held by the lens holding member 2. Therefore, the optical axis JD of the lens body held by the lens holding member 2 is configured to easily coincide with the central axes of the lens holding member 2 and the coil 3.

When the winding of the wire rod around the outer circumference of the lens holding member 2 is completed, the extending portion 33A connected to the end portion of the winding portion 13 on the winding end side has a notch portion from the subject side of the flange portion 52 as shown in FIG. 9A. It is pulled out to the image pickup element side of the flange portion 52 via 52k. Specifically, the insertion portion 33k passes through the notch portion 52k, the facing portion 33c extends so as to face the bottom surface of the lens holding member 2, and the winding portion 33m is wound around the protruding portion 72A of the lens holding member 2. In the example shown in FIG. 9A, the extending portion 33A is wound around the protruding portion 72A for three turns.

Next, the cover member 4 constituting the drive mechanism MK will be described. In the present embodiment, the cover member 4 is manufactured by subjecting a plate material made of a soft magnetic material such as iron to punching, drawing, and the like, and functions as a yoke. Specifically, as shown in FIG. 1, the cover member 4 has a box-shaped outer shape that defines the storage portion 4s. The cover member 4 has a rectangular tubular outer peripheral wall portion 4A and a flat plate-shaped and rectangular annular ceiling portion 4B provided so as to be continuous with the upper end (Z1 side end) of the outer peripheral wall portion 4A. The cover member 4 thus configured accommodates the coil 3 and the magnet 5 in the accommodating portion 4s as shown in FIG. 10B, and is coupled to the base member 18 as shown in FIGS. 2A and 2B. The housing HS is configured together with the base member 18. However, the cover member 4 may be made of a non-magnetic material such as austenitic stainless steel.

Next, the magnet 5 constituting the drive mechanism MK will be described. The magnet 5 has a substantially rectangular parallelepiped shape as shown in FIG. Then, as shown in FIG. 10B, the magnet 5 is located outside the coil 3 and is along two of the four side surfaces of the rectangular tubular outer peripheral wall portion 4A constituting the cover member 4 facing each other. It is arranged like this. Specifically, as shown in FIGS. 10A and 10B, the first magnet 5A is arranged along the side surface facing the protrusion 72A, and the second magnet 5B is arranged along the side surface facing the protrusion 72B. It is arranged like this. Each of the first magnet 5A and the second magnet 5B is fixed to the cover member 4 by an adhesive, and is arranged so that, for example, the inside is the north pole and the outside is the south pole. However, each of the first magnet 5A and the second magnet 5B may be arranged so that the inner side is the S pole and the outer side is the N pole.

Next, the leaf spring 6 and the fixed side member RG will be described with reference to FIGS. 11A, 11B, 12A, 12B, and 13A to 13D. 11A and 11B are views showing a configuration example of the leaf spring 6. Specifically, FIG. 11A is a top view of the upper leaf spring 16, and FIG. 11B is a bottom view of the lower leaf spring 26. 12A and 12B are diagrams illustrating an example of a connection structure between the second lower leaf spring 26B and the coil 3. Specifically, FIG. 12A is an enlarged view of the range R3 shown in FIG. 10A, and FIG. 12B shows the second lower leaf spring 26B and the coil when the portion in the range R3 shown in FIG. 10A is viewed from the X2 side. 3 and an enlarged view of the lens holding member 2. In FIGS. 12A and 12B, the conductive adhesive CA as a bonding material is shown by cross-hatching for the sake of clarity. 13A to 13D are views showing a configuration example of the base member 18 as the fixed side member RG. Specifically, FIG. 13A is an upward perspective view of the base member 18 not including the terminal member 7, FIG. 13B is an upward perspective view of the terminal member 7 embedded in the base member 18, and FIG. 13C is an upward perspective view. FIG. 13D is an upward perspective view of the base member 18 including the terminal member 7, and FIG. 13D is an upward perspective view of the base member 18 in a state where the first lower leaf spring 26A and the second lower leaf spring 26B are assembled.

The leaf spring 6 is made of a metal plate whose main material is copper alloy. As shown in FIG. 1, the leaf spring 6 includes an upper leaf spring 16 arranged between the lens holding member 2 and the cover member 4 (strictly speaking, the spacer 1), and the lens holding member 2 and the base member 18. It includes a lower leaf spring 26 arranged between them. In the state where the lens holding member 2 and the leaf spring 6 (upper leaf spring 16, first lower leaf spring 26A, and second lower leaf spring 26B) are combined, the lens holding member 2 of the leaf spring 6 is in the optical axis direction. The lens holding member 2 is supported so as to be movable in the (Z-axis direction). The lower leaf spring 26 also functions as a feeding member for supplying an electric current to the coil 3. Therefore, the first lower leaf spring 26A is electrically and mechanically connected to one end of the coil 3, and the second lower leaf spring 26B is electrically and mechanically connected to the other end of the coil 3. A spacer 1 is arranged between the upper leaf spring 16 and the cover member 4. The spacer 1 is arranged so as to prevent the lens holding member 2 and the cover member 4 from colliding with each other when the lens holding member 2 moves in the Z1 direction. That is, the spacer 1 is arranged so as to form a space between the lens holding member 2 and the ceiling portion 4B of the cover member 4. However, the spacer 1 may be omitted as long as a space can be formed between the lens holding member 2 and the ceiling portion 4B of the cover member 4 by another structure or the like.

As shown in FIG. 11A, the upper leaf spring 16 has a substantially rectangular annular shape, and has an inner portion 16i as a first support portion (movable side support portion) fixed to the lens holding member 2 and a fixed side member. It includes two outer portions 16e as a second support portion (fixed side support portion) fixed to the RG, and four elastic arm portions 16 g located between the inner portion 16i and the outer portion 16e. Specifically, each of the two outer portions 16e has two corner portions 16b and a crosspiece 16r connecting the two corner portions 16b. The crosspiece 16r is sandwiched between the spacer 1 and the magnet 5 and fixed with an adhesive. The spacer 1, the cover member 4, and the magnet 5 function as the fixed-side member RG.

When the upper leaf spring 16 is incorporated in the lens driving device 101, the inner portion 16i is placed on the pedestal portion 12d (see FIG. 5A) of the lens holding member 2 as shown in FIG. 4A. Then, the inner portion 16i is fixed to the lens holding member 2 by the adhesive AD (see FIG. 4A) applied to the recess 12dh formed in the pedestal portion 12d. As shown in FIG. 4B, the outer portion 16e is in contact with the upper surface (Z1 side surface) of the magnet 5 and is sandwiched and fixed between the spacer 1 (not shown in FIG. 4B) and the magnet 5. The outer portion 16e sandwiched and fixed between the spacer 1 and the magnet 5 functions as a fixed-side member RG.

As shown in FIG. 11A, the upper leaf spring 16 is formed so as to be rotationally symmetric with respect to the optical axis JD. The upper leaf spring 16 is fixed to the lens holding member 2 at the inner portion 16i, and is fixed to the cover member 4 via the spacer 1 at the outer portion 16e. Therefore, the upper leaf spring 16 can support the lens holding member 2 in a well-balanced manner.

As shown in FIG. 11B, the first lower leaf spring 26A and the second lower leaf spring 26B are configured so that their inner shapes are substantially semicircular. Then, each of the first lower leaf spring 26A and the second lower leaf spring 26B is fixed to the inner portion 26i as the first support portion (movable side support portion) fixed to the lens holding member 2 and the fixed side member RG. It includes an outer portion 26e as a second support portion (fixed side support portion) to be formed, and two elastic arm portions 26g located between the inner portion 26i and the outer portion 26e.

As shown in FIG. 11B, the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B are the two inner joint portions 26c joined to the projecting portion 2t of the lens holding member 2. A connecting portion 26p connecting between the inner joining portions 26c and a connecting plate portion 26h facing the extending portion 33 of the coil 3 are included.

When the first lower leaf spring 26A and the second lower leaf spring 26B are incorporated into the lens driving device 101, each of the four projecting portions 2t of the lens holding member 2 shown in FIG. 6A has a position shown in FIG. 11B. 1 It is inserted into a circular through hole 26r provided in the inner joint portion 26c of each of the lower leaf spring 26A and the second lower leaf spring 26B. Then, the inner joint portion 26c is fixed to the lens holding member 2 as shown in FIG. 10A by, for example, applying hot caulking or cold caulking to the projecting portion 2t. As a result, the inner portions 26i of the first lower leaf spring 26A and the second lower leaf spring 26B are positioned and fixed to the lens holding member 2.

The outer portion 26e of the first lower leaf spring 26A includes the outer joint portion 26d joined to the base member 18, as shown in FIG. 11B. The through hole 26s provided in the outer joint portion 26d of the first lower leaf spring 26A receives the projecting portion 18t (see FIG. 13A) provided on the upper surface of the base member 18. Then, the projecting portion 18t is subjected to hot caulking or cold caulking and fixed to the outer joint portion 26d. As a result, the outer portion 26e of the first lower leaf spring 26A is positioned and fixed to the base member 18 as shown in FIG. 13D. The same applies to the second lower leaf spring 26B.

The first lower leaf spring 26A is connected to the lens holding member 2 via the two inner joint portions 26c, and is connected to the base member 18 via the two outer joint portions 26d. The same applies to the second lower leaf spring 26B. With this configuration, the first lower leaf spring 26A and the second lower leaf spring 26B can support the lens holding member 2 in a state of being movable in the optical axis direction in a well-balanced manner.

Next, with reference to FIGS. 12A and 12B, an example of the connection structure between the second lower leaf spring 26B and the coil 3 will be described. The description of the second lower leaf spring 26B is similarly applied to the first lower leaf spring 26A.

As shown in FIGS. 12A and 12B, the connecting plate portion 26h of the inner portion 26i of the second lower leaf spring 26B has a jetty portion 82 of the lens holding member 2 (see FIG. 9B) when the lens driving device 101 is assembled. It is configured to face.). That is, as shown in FIG. 12A, the surface of the connection plate portion 26h on the subject side (Z1 side) faces the concave accommodating portion 82s surrounded by the jetty portion 82. Then, as shown in FIG. 12A, the facing portion 33c of the extending portion 33B of the coil 3 is an image pickup of the surface of the inner portion 26i (connecting plate portion 26h) of the second lower leaf spring 26B on the subject side and the lens holding member 2. It extends through between the surface on the element side (Z2 side). The jetty portion 82 is composed of a stepped portion formed on the bottom surface of the lens holding member 2.

The accommodating portion 82s is configured to accommodate the conductive adhesive CA connecting the extending portion 33B of the coil 3 and the second lower leaf spring 26B. In the present embodiment, since the jetty portion 82 is formed at a position adjacent to the protrusion 72B, the side wall of the protrusion 72B is suitably used as a part of the jetty portion 82. Therefore, the accommodating portion 82s is provided at a position adjacent to the protruding portion 72B.

When the second lower leaf spring 26B is assembled to the lens holding member 2, as shown in FIG. 12B, the tip of the protruding portion 72B (the end on the Z2 side) is the inner portion 26i of the second lower leaf spring 26B. It protrudes downward (in the Z2 direction) from the inner portion 26i so as to be located on the image sensor side (Z2 side) of the above. Further, a part of the winding portion 33m is also wound around the protruding portion 72B so as to be located on the image pickup element side (Z2 side) of the inner portion 26i.

The second lower leaf spring 26B and the extending portion 33B of the coil 3 are electrically and physically connected by a conductive adhesive CA in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before incorporating the second lower leaf spring 26B into the lens holding member 2, the accommodating portion 82s surrounded by the jetty portion 82 of the lens holding member 2 is filled with the conductive adhesive CA, and then the second. The lower leaf spring 26B is attached to the lens holding member 2. Then, the projecting portion 2t of the lens holding member 2 is heated and the conductive adhesive CA is thermally cured. From the filling of the conductive adhesive CA into the accommodating portion 82s to the thermosetting of the conductive adhesive CA, the lens holding member 2 is typically arranged upside down so that the protruding portion 72B protrudes vertically upward. It is done in the state. Therefore, the conductive adhesive CA can be appropriately held at a desired position (position within the accommodating portion 82s) even when it has fluidity. Since a part of the facing portion 33c is arranged in the accommodating portion 82s, it is embedded in the conductive adhesive CA. The conductive adhesive CA is not limited to the thermosetting type, but may be an ultraviolet curable type.

Next, the fixed side member RG will be described. The fixed-side member RG includes a spacer 1, a cover member 4, and a magnet 5 for fixing the upper leaf spring 16, and a base member 18 for fixing each of the first lower leaf spring 26A and the second lower leaf spring 26B.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the present embodiment, as shown in FIG. 13A, the base member 18 is a member having a rectangular plate-like outer shape, and a circular opening 18k is formed in the center. Further, on the surface (upper surface) of the base member 18 on the subject side (Z1 side), six round convex projecting portions 18t protruding upward are provided. The projecting portion 18t is inserted into a through hole 26s provided in the outer joint portion 26d of each of the first lower leaf spring 26A and the second lower leaf spring 26B. At this time, the projecting portion 18t is heat-caulked and fixed to the outer joint portion 26d. In FIGS. 13A, 13C, and 13D, the projecting portion 18t is shown in a state where the tip is deformed after being heated. The same applies to the other drawings illustrating the projecting portion 18t. The projecting portion 18t may be cold-crimped and fixed to the outer joint portion 26d.

As shown in FIG. 13B, a terminal member 7 formed of a metal plate containing a material such as copper or iron or an alloy containing them as a main component is insert-molded and embedded in the base member 18. The terminal member 7 includes the first terminal member 7A to the fourth terminal member 7D, and each of the first terminal member 7A to the fourth terminal member 7D has a part of the upper surface of the base member 18 (as shown in FIG. 13C). It is exposed on the surface on the Z1 side). Each of the first terminal member 7A and the second terminal member 7B, which are electrically insulated from each other, has a terminal portion 7AT extending downward (Z2 direction) from an end portion on the front side (Y2 side) of the base member 18. It is electrically and mechanically connected to a substrate (not shown) on which an image sensor is mounted via a terminal portion 7BT. Further, as shown in FIGS. 13C and 13D, the first terminal member 7A is electrically and mechanically connected to the first lower leaf spring 26A by a bonding material such as solder at the exposed portion 7AP, and is connected to the second terminal. The member 7B is electrically and mechanically connected to the second lower leaf spring 26B at the exposed portion 7BP by a joining material such as solder. Further, the first lower leaf spring 26A is electrically and mechanically connected to one end of the coil 3, and the second lower leaf spring 26B is electrically and mechanically connected to the other end of the coil 3. Therefore, the coil 3 can receive the electric current via the first terminal member 7A and the second terminal member 7B and the first lower leaf spring 26A and the second lower leaf spring 26B.

The third terminal member 7C includes two connecting portions 7CP, and the fourth terminal member 7D includes two connecting portions 7DP. As shown in FIG. 13C, the third terminal member 7C exposes two connecting portions 7CP on the upper surface of the base member 18 so as to correspond to two of the lower ends of the four corners of the cover member 4. Similarly, as shown in FIG. 13C, the fourth terminal member 7D exposes two connecting portions 7DP on the upper surface of the base member 18 so as to correspond to the remaining two of the lower ends of the four corners of the cover member 4. I'm letting you. The base member 18 is positioned with the inner surface at the lower end of the outer peripheral wall portion 4A of the cover member 4 in combination with the outer peripheral side surface of the base member 18, and then, as shown in FIG. 2A, the connecting portion 7CP and the connecting portion 7DP. And the lower ends of the four corners of the cover member 4 are welded and fixed to the cover member 4. The cover member 4 and the base member 18 may be fixed at least partially with an adhesive. As a result, the third terminal member 7C, the fourth terminal member 7D, and the cover member 4 are electrically integrated and grounded via the terminal portion 7DT of the fourth terminal member 7D.

Next, the vibration damping material DM that suppresses the vibration of the lens holding member 2 will be described. As shown in FIG. 5A, the vibration damping material DM is housed in the housing portion 2A formed on the square wall portion 2C of the lens holding member 2. In this embodiment, the lens holding member 2 has four square wall portions 2C corresponding to the four corner portions of the housing HS (see FIG. 2A), for example, as shown in FIG. 7A. The four square wall portions 2C include the first square wall portion 2C1 to the fourth square wall portion 2C4. The accommodating portion 2A is formed so as to open upward (Z1 direction) on the upper surface (Z1 side surface) of each of the four square wall portions 2C, which is the subject side. Specifically, the accommodating portion 2A includes a first accommodating portion 2A1 to a fourth accommodating portion 2A4. The first accommodating portion 2A1 is formed on the upper surface of the first square wall portion 2C1, the second accommodating portion 2A2 is formed on the upper surface of the second square wall portion 2C2, and the third accommodating portion 2A3 is formed on the third square wall portion. It is formed on the upper surface of the 2C3, and the fourth accommodating portion 2A4 is formed on the upper surface of the fourth square wall portion 2C4. In the example shown in FIG. 7A, the square wall portion 2C on which the accommodating portion 2A is formed is configured to be rotationally symmetric with respect to the optical axis JD.

The vibration damping material DM is a member for suppressing the vibration of the lens holding member 2. The vibration damping material DM is arranged so as to connect the lens holding member 2 and the cover member 4, and is configured to be elastically stretchable according to the relative movement of the lens holding member 2 with respect to the cover member 4. In the present embodiment, the vibration damping material DM is capable of suppressing the vibration of the lens holding member 2 without affecting the original movement of the lens holding member 2 realized by the drive mechanism MK, that is, appropriate damping. It is configured to have a hardness and shape that can exert force. Specifically, the damping material DM is a gel-like damper material formed by curing a fluid adhesive with ultraviolet rays or heat, and as shown in FIG. 3A, the first damping material DM1 to The fourth damping material DM4 is included. More specifically, as shown in FIG. 5B, the first damping material DM1 is housed in the first housing section 2A1, the second damping material DM2 is housed in the second housing section 2A2, and the third damping material DM2 is housed. The vibration material DM3 is housed in the third storage part 2A3, and the fourth vibration damping material DM4 is housed in the fourth storage part 2A4. In FIG. 5B, the first damping material DM1 to the fourth damping material DM4 are represented by cross-hatching. The vibration damping material DM may be formed of another material such as a thermosetting resin, a thermosetting resin, a thermosetting silicone rubber, or a thermosetting silicone rubber.

As shown in FIG. 2A, the cover member 4 has a bent piece 4T as a protruding portion extending downward (Z2 direction) from the ceiling portion 4B. Specifically, as shown in FIG. 3A, the bent piece 4T was housed in the first bent piece 4T1 and the second house 2A2 corresponding to the first damping material DM1 housed in the first house 2A1. The second bent piece 4T2 corresponding to the second damping material DM2, the third bent piece 4T3 corresponding to the third damping material DM3 accommodated in the third accommodating portion 2A3, and the fourth accommodating portion 2A4 were accommodated. It has a fourth bent piece 4T4 corresponding to the fourth damping material DM4.

Next, the details of the bent piece 4T will be described with reference to FIGS. 14A to 14C. 14A to 14C are views relating to the bent piece 4T. Specifically, FIG. 14A is a perspective view of the first bent piece 4T1 when the first damping material DM1 is not accommodated (applied) in the first accommodating portion 2A1. FIG. 14B is a perspective view of the first bent piece 4T1 when the first damping material DM1 is housed (coated) in the first housing portion 2A1, and corresponds to FIG. 14A. 14C is a cross-sectional view of the lens driving device 101 in a vertical plane including the alternate long and short dating line L4 shown in FIG. 14B. In FIG. 14C, for the sake of clarity, the first damping material DM1 is shown as translucent. The following description relates to the first bent piece 4T1, but is similarly applied to each of the second bent piece 4T2 to the fourth bent piece 4T4.

As shown in FIG. 14C, the first bent piece 4T1 has a tip ED inserted into the first accommodating portion 2A1. The tip ED is in contact with the first damping material DM1 housed in the first housing 2A1 in the initial state of the lens driving device 101.

The initial state of the lens driving device 101 is, for example, the state of the lens driving device 101 when the Z1 direction is arranged vertically upward and no current is supplied to the coil 3.

Next, with reference to FIGS. 15A and 15B, the relationship between the accommodating portion 2A formed on the upper surface of the lens holding member 2 and the upper leaf spring 16 will be described. 15A and 15B are top views of the lens holding member 2 to which the upper leaf spring 16 is attached. Specifically, FIG. 15A is an overall top view of the lens holding member 2 to which the upper leaf spring 16 is attached. FIG. 15B is an enlarged view of the range R4 surrounded by the broken line shown in FIG. 15A.

As shown in FIGS. 15A and 15B, the elastic arm portion 16g of the upper leaf spring 16 is arranged so that the elastic arm portion 16g and the accommodating portion 2A do not overlap in the optical axis direction (direction parallel to the Z axis). To. However, if the elastic arm portion 16g does not come into contact with the bent piece 4T when the lens holding member 2 moves, the elastic arm portion 16g is arranged so as to partially overlap the accommodating portion 2A in the optical axis direction. May be good.

With this configuration, the damping material DM can be easily accommodated (coated) in the accommodating portion 2A so as not to adhere to the upper leaf spring 16 even when the upper leaf spring 16 is attached to the lens holding member 2. Can be done. In addition, the amount of the damping material DM applied can be easily controlled. Then, the vibration damping material DM is cured by, for example, ultraviolet rays in a state where the cover member 4 is attached to the base member 18, that is, in a state where the bent piece 4T is in contact with the vibration damping material DM. Typically, the damping material DM is applied in the accommodating portion 2A with the upper leaf spring 16 attached to the lens holding member 2 and before the cover member 4 is attached to the base member 18. After the cover member 4 is attached to the base member 18, it is cured by ultraviolet rays. However, the damping material DM may be applied and cured in the accommodating portion 2A after the cover member 4 is attached to the base member 18.

Next, with reference to FIGS. 16A and 16B, the arrangement of the accommodating portion 2A in the square wall portion 2C of the lens holding member 2 will be described. 16A and 16B are top views of the first accommodating portion 2A1 formed on the first square wall portion 2C1 of the lens holding member 2. Specifically, FIG. 16A is an enlarged view of the range R5 surrounded by the broken line shown in FIG. 7A. FIG. 16B is an enlarged view of the range R6 surrounded by the broken line shown in FIG. 3A.

The broken line circle CL shown in FIGS. 7A, 16A, and 16B is a circle centered on the optical axis JD and passing through the respective center points CP1 of the first accommodating portion 2A1 to the fourth accommodating portion 2A4 in the XY plane. The center point CP1 of the accommodating portion 2A is a point on the XY plane located at the center when the accommodating portion 2A is viewed from above.

The line segment L1 shown in FIGS. 7A, 16A, and 16B is a line segment passing through the optical axis JD and the point VT in the XY plane. The point VT is a point on the XY plane corresponding to the apex of the rectangular RT surrounding the lens holding member 2 when the lens holding member 2 is viewed from above.

As shown in FIG. 16A, the first accommodating portion 2A1 is formed at a position deviated from the center of the first square wall portion 2C1. Specifically, the center point CP1 of the first accommodating portion 2A1 is formed at a position shifted to the left side (counterclockwise direction side) from the center point CP2 of the first square wall portion 2C1. That is, the center point CP1 of the first accommodating portion 2A1 and the center point CP2 of the first square wall portion 2C1 do not match. In the present embodiment, the center point CP2 of the square wall portion 2C is a point located at the intersection of the broken line circle CL and the line segment L1.

In the present embodiment, the first accommodating portion 2A1 is formed so as to be located on the left side of the line segment L1, but may be formed so as to be located on the right side of the line segment L1. Further, in the first accommodating portion 2A1, the elastic arm portion 16g of the upper leaf spring 16 is formed in a desired shape, and when the lens holding member 2 moves, the elastic arm portion 16g and the bent piece 4T come into contact with each other. If the conditions such as not being satisfied are satisfied, the center point CP1 may be formed so as to coincide with the center point CP2 of the first square wall portion 2C1. The same applies to the second accommodating portion 2A2 to the fourth accommodating portion 2A4.

Such a configuration in which the arrangement of the accommodating portion 2A can be arbitrarily determined is such that the elastic arm portion 16 g of the upper leaf spring 16 formed so as not to overlap the accommodating portion 2A as described with reference to FIGS. 15A and 15B. The degree of freedom in shape can be improved.

Next, with reference to FIG. 17, the relationship between the bent piece 4T, the coil 3, and the magnet 5 will be described. FIG. 17 is a cross-sectional view of the lens driving device 101 in the XZ plane including the broken line L3 shown in FIG. 3A. The following description with reference to FIG. 17 relates to the fourth bent piece 4T4, but is similarly applied to each of the first bent piece 4T1 to the third bent piece 4T3.

As shown in FIG. 17, the fourth bent piece 4T4 formed inside the ceiling portion 4B of the cover member 4 (the side closer to the optical axis JD) has, in the initial state, the fourth square wall portion 2C4 of the lens holding member 2. It is formed so as to enter the inside of the concave (pocket-shaped) fourth accommodating portion 2A4 formed on the upper surface of the lens. The first magnet 5A is fixed to the inner surface of the outer peripheral wall portion 4A of the cover member 4 with an adhesive. The coil 3 fixed to the outer periphery of the lens holding member 2 is arranged so as to be located between the fourth bent piece 4T4 and the first magnet 5A in the direction perpendicular to the optical axis direction.

With this arrangement, the fourth bent piece 4T4 functions as a magnetic yoke (inner yoke) arranged inside the coil 3 (the side closer to the optical axis JD), and the outer peripheral wall portion 4A is outside the coil 3 (optical axis). It functions as a magnetic yoke (outer yoke) placed on the side far from the JD.

Next, with reference to FIGS. 5A, 5B, and 17, the regulation unit ST that restricts the excessive movement of the lens holding member 2 upward (Z1 direction) will be described.

As shown in FIG. 5A, the lens holding member 2 includes four convex portions 2P protruding upward (Z1 direction) from the surface on the subject side (Z1 side). The four convex portions 2P include a first convex portion 2P1 to a fourth convex portion 2P4.

In the four convex portions 2P, the lens holding member 2 supported by the upper leaf spring 16 and the lower leaf spring 26 so as to be movable in the optical axis direction moves upward by a predetermined distance D1 (see FIG. 17) from the initial state. At that time, it is configured to come into contact with the ceiling surface CS (see FIG. 17) of the ceiling portion 4B of the cover member 4. In this case, the ceiling surface CS functions as the regulation unit ST. FIG. 17 shows that the distance between the end surface of the second convex portion 2P2 and the ceiling surface CS is a predetermined distance D1 in the initial state.

Even when the end surface of the second convex portion 2P2 and the ceiling surface CS come into contact with each other, that is, even when the lens holding member 2 moves upward by the distance D1, the bent piece 4T is with the bottom BS of the accommodating portion 2A. It is configured so that a gap is formed between them.

Specifically, the lens driving device 101 is configured such that a gap D2 is formed between the tip ED of the bent piece 4T and the bottom BS of the accommodating portion 2A in the initial state.

Therefore, in the lens driving device 101, even when the end surface of the second convex portion 2P2 and the ceiling surface CS come into contact with each other, that is, even when the lens holding member 2 moves upward by a distance D1, the fourth bent piece 4T4 The gap of ΔD (= D2-D1) is maintained between the tip ED of the lens and the bottom BS of the fourth accommodating portion 2A4.

With this configuration, in the lens driving device 101, even when the lens holding member 2 moves upward to the maximum extent, the bent piece 4T comes into contact with the bottom BS of the accommodating portion 2A and is deformed or damaged. Can be reliably prevented.

Next, with reference to FIGS. 6A, 6B, 13A to 13D, and 17, a convex portion 2Q that limits excessive movement of the lens holding member 2 downward (Z2 direction) will be described.

As shown in FIG. 6A, the lens holding member 2 includes four convex portions 2Q protruding downward (Z2 direction) from the surface on the image sensor side (Z2 side). The four convex portions 2Q include the first convex portion 2Q1 to the fourth convex portion 2Q4.

In the four convex portions 2Q, the lens holding member 2 supported by the upper leaf spring 16 and the lower leaf spring 26 so as to be movable in the optical axis direction moves downward by a predetermined distance D3 (see FIG. 17) from the initial state. When this is done, it is configured to come into contact with the four convex portions 18Q (see FIG. 13C) of the base member 18. In this case, the convex portion 18Q functions as a regulating portion. As shown in FIG. 13C, the four convex portions 18Q include the first convex portion 18Q1 to the fourth convex portion 18Q4. FIG. 17 shows that the distance between the end surface of the first convex portion 2Q1 and the end surface of the first convex portion 18Q1 is a predetermined distance D3 in the initial state.

The protruding portion 72 of the lens holding member 2 is configured to protrude downward from the convex portion 2Q, but a concave portion is formed in the portion of the base member 18 corresponding to the protruding portion 72. Therefore, the lens holding member 2 moves downward by a predetermined distance D3 (see FIG. 17) from the initial state, and the four convex portions 2Q of the lens holding member 2 and the four convex portions 18Q of the base member 18 (see FIG. 13C). The protrusion 72 is configured so as not to come into contact with the base member 18 even when the protrusion 72 comes into contact with the base member 18.

Further, in the present embodiment, the bent piece 4T is configured to withdraw from the accommodating portion 2A when the lens holding member 2 moves downward as much as possible. However, the bent piece 4T may be configured to maintain the state of being in the accommodating portion 2A even when the lens holding member 2 moves to the maximum downward.

With the above configuration, in the lens driving device 101, even when the lens holding member 2 moves to the maximum downward, the bent piece 4T comes into contact with the lens holding member 2 and is deformed or damaged. It can be surely prevented from being stored.

As described above, the lens driving device 101 according to the embodiment of the present invention supports the fixed side member RG, the lens holding member 2 capable of holding the lens body, and the lens holding member 2 so as to be movable in the optical axis direction. It includes a leaf spring 6 as a member and a drive mechanism MK for moving the lens holding member 2 in the optical axis direction. Then, as shown in FIG. 5A, for example, the lens holding member 2 has an accommodating portion 2A having an open upper portion on the subject side. The cover member 4 as the fixed side member RG has a protruding portion (bent piece 4T) into which the tip portion ED is inserted into the accommodating portion 2A, for example, as shown in FIG. 14A. As shown in FIG. 5B, for example, the damping material DM is housed in the housing section 2A. The tip ED of the bent piece 4T is in contact with the vibration damping material DM provided in the accommodating portion 2A, for example, as shown in FIG. 14B.

The fixed-side member RG preferably includes a housing HS having an outer peripheral wall portion 4A and a ceiling portion 4B. In this case, the lens holding member 2 is arranged in the housing HS, the bent piece 4T as a protruding portion extends from the ceiling portion 4B, and the tip portion ED is inserted into the accommodating portion 2A, for example, as shown in FIG. It is configured as follows.

With this configuration, the lens driving device 101 can prevent the vibration damping material DM for suppressing the vibration of the lens holding member 2 from falling off. This is because the damping material DM is held in the accommodating portion 2A whose upper portion is open.

Further, this configuration can improve the assembly stability of the lens driving device 101, and thus can improve the product reliability of the lens driving device 101. In this configuration, the damping material DM is not applied to the surface (for example, the side surface) of the lens holding member 2 and cured, but is filled in the concave accommodating portion 2A formed on the upper surface of the lens holding member 2. This is because it is cured. That is, this configuration is because the damping material DM having fluidity can be stably held in the accommodating portion 2A until it is cured.

Further, the lens driving device 101 receives an impact given from the outside by connecting the lens holding member 2 (accommodating portion 2A) and the cover member 4 (bent piece 4T as a protruding portion) via the vibration damping material DM. It is possible to prevent the lens holding member 2 from resonating due to a stimulus such as.

In the above-described embodiment, the accommodating portion 2A is formed so as not to penetrate the lens holding member 2 in the vertical direction, that is, to have a bottom surface, but unless the damping material DM flows downward. May be formed so as to penetrate the lens holding member 2 in the vertical direction. For example, the bottom BS of the accommodating portion 2A may lead to the lower surface of the lens holding member 2 through a through hole having a small diameter.

As shown in FIG. 3A, for example, the housing HS has a rectangular shape in a plan view. Then, as shown in FIG. 7A, for example, the lens holding member 2 has a square wall portion 2C corresponding to a corner portion of the housing HS, and the accommodating portion 2A is formed in the square wall portion 2C.

This configuration can improve the space efficiency in the housing HS, and can suppress the increase in size of the lens driving device 101.

The leaf spring 6 as a support member preferably includes an upper leaf spring 16 and a lower leaf spring 26. In the present embodiment, the lower leaf spring 26 includes a first lower leaf spring 26A and a second lower leaf spring 26B. The upper leaf spring 16 has an outer portion 16e as a fixed side support portion fixed to the fixed side member RG, an inner portion 16i as a movable side support portion fixed to the lens holding member 2, and an outer portion 16e and an inner portion. It has an elastic arm portion 16g provided between the 16i and the 16i. Similarly, the lower leaf spring 26 has an outer portion 26e as a fixed side support portion fixed to the fixed side member RG, an inner portion 26i as a movable side support portion fixed to the lens holding member 2, and an outer portion 26e. It has an elastic arm portion 26g provided between the inner portion 26i and the inner portion 26i. The accommodating portion 2A is formed at a position deviated from the center of the square wall portion 2C.

This configuration can improve the degree of freedom in the shape of the elastic arm portion 16g constituting the upper leaf spring 16. The elastic arm portion 16g is preferably arranged so as not to overlap the accommodating portion 2A in the optical axis direction, because the accommodating portion 2A does not need to be arranged at the center of the square wall portion 2C in this configuration. be.

Specifically, as shown in FIGS. 16A and 16B, the center point CP1 of the first accommodating portion 2A1 in the top view is the optical axis JD from the center point CP2 of the first square wall portion 2C1 in the top view. It is formed at a position shifted in the circumferential direction (counterclockwise direction) of the broken line circle CL as the center.

The housing HS preferably includes a metal cover member 4 provided with an outer peripheral wall portion 4A and a ceiling portion 4B. The bent piece 4T is formed by being bent downward from the ceiling portion 4B.

This configuration can increase the yield of the lens drive device 101 as a product. This is because the bent piece 4T as the protruding portion can be easily processed.

The drive mechanism MK has at least a coil 3 provided on the lens holding member 2 and a magnet 5 facing the coil 3. The coil 3 is preferably provided so as to surround the outer periphery of the lens holding member 2. The cover member 4 is preferably made of magnetic metal and has a plurality of bent pieces 4T (first bent pieces 4T1 to fourth bent pieces 4T4) as shown in FIG. 2A. A plurality of accommodating portions 2A (four in the example shown in FIG. 2A) are provided corresponding to the bent piece 4T.

Specifically, as shown in FIGS. 3A and 7A, the accommodating portion 2A has a first accommodating portion 2A1 formed on the first square wall portion 2C1 corresponding to the first bent piece 4T1 and a second bent piece. The second accommodating portion 2A2 formed in the second square wall portion 2C2 corresponding to 4T2, the third accommodating portion 2A3 formed in the third square wall portion 2C3 corresponding to the third bent piece 4T3, and the fourth. It includes a fourth accommodating portion 2A4 formed in the fourth square wall portion 2C4 corresponding to the bent piece 4T4.

The magnet 5 is preferably fixed to the inner surface of the outer peripheral wall portion 4A of the cover member 4, and a part of the coil 3 is arranged between at least one of the bent pieces 4T and the magnet 5.

Specifically, as shown in FIG. 17, the first magnet 5A is fixed to the inner surface of the outer peripheral wall portion 4A of the cover member 4 with an adhesive, and the fourth bent piece is fixed in the direction perpendicular to the optical axis direction. A part of the coil 3 is arranged between the 4T4 and the first magnet 5A.

The fixed side member RG preferably has a convex portion 2P that restricts the upward movement of the lens holding member 2 in the optical axis direction. In the above-described embodiment, as shown in FIG. 17, the ceiling surface CS of the ceiling portion 4B of the cover member 4 functions as the regulation portion ST. Specifically, when the lens holding member 2 moves upward and the convex portion 2P of the lens holding member 2 and the ceiling surface CS of the ceiling portion 4B come into contact with each other, the upward movement of the lens holding member 2 is restricted.

As shown in FIG. 17, the accommodating portion 2A may be formed in a concave shape and have a bottom BS. In this case, in a state where the lens holding member 2 moves upward and comes into contact with the ceiling surface CS as the regulating portion ST, the bent piece 4T as the protruding portion is configured to have a gap with the bottom BS. May be. For example, in the initial state, the distance D1 between the convex portion 2P of the lens holding member 2 and the ceiling surface CS of the ceiling portion 4B is smaller than the distance D2 between the tip portion ED and the bottom portion BS of the bent piece 4T. It may be configured as follows.

The preferred embodiment of the present invention has been described in detail above. However, the invention is not limited to the embodiments described above. Various modifications or substitutions can be applied to the above-described embodiments without departing from the scope of the present invention. Further, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical conflict.

For example, in the above embodiment that realizes the automatic focus adjustment function, the first lower leaf spring 26A and the extending portion 33A are electrically and mechanically connected, and the second lower leaf spring 26B and the extending portion 33B are connected to each other. Is electrically and mechanically connected, but the present invention is not limited to this configuration. In the present invention, for example, in a lens driving device with an image stabilization function, the upper leaf spring 16 is divided into two, one of which is electrically and mechanically connected to the extending portion 33A, and the other is extended. It may include a configuration that is electrically and mechanically connected to the existing portion 33B. In this configuration, the upper leaf spring 16 is arranged so as to connect the magnet holder as a support member and the lens holding member 2, and is configured to support the lens holding member 2 so as to be movable in the optical axis direction. .. In this case, the upper leaf spring 16 has an inner portion 16i as a first support portion fixed to the lens holding member 2, an outer portion 16e as a second support portion fixed to the magnet holder, and an inner portion 16i and an outer side. Includes an elastic arm portion 16g located between the portion 16e. The magnet holder is a member that holds the magnet 5 facing the coil 3 held by the lens holding member 2, and is typically connected to the base member 18 via a suspension wire in the optical axis direction by the suspension wire. It is supported so that it can be moved in the direction perpendicular to the magnet. Specifically, the magnet holder is perpendicular to the optical axis direction by a drive mechanism composed of a magnet 5 and a coil different from the coil 3 installed on the base member 18 so as to face the magnet 5. It is configured to be able to move in a direction. In this configuration, a flange portion having a notch may be provided on the upper end side (Z1 side) of the lens holding member 2. Further, the projecting portion 72 is provided so as to project upward from the upper end portion which is one end portion in the optical axis direction of the lens holding member 2 on the side where the upper leaf spring 16 is arranged. The magnet holder functions as a fixed-side member that does not move in the optical axis direction with respect to the lens holding member that moves in the optical axis direction.

Further, in the above-described embodiment, the coil 3 is wound in an octagonal ring on the outer peripheral surface side of the lens holding member 2. However, the present invention is not limited to this configuration. The coil 3 has an oval or oval coil body portion held on the side surface of the lens holding member 2, that is, a coil body portion arranged so that the central axis is perpendicular to the optical axis direction. It may be a coil. Specifically, the coil 3 has four oval-shaped coil main bodies held on each of the four side surfaces of the lens holding member 2 having the coil support portion 12j having a substantially rectangular outer shape when viewed from above. It may be a coil, or it may be a coil having two oval-shaped coil main bodies held on each of the two facing surfaces of the lens holding member 2. In this case, the first magnet 5A may be a combination of two two-pole magnets or one quadrupole magnet. The same applies to the second magnet 5B.

Further, in the above-described embodiment, the bent piece 4T as the protruding portion extends downward (Z2 direction) from the ceiling portion 4B of the cover member 4 and enters the accommodating portion 2A formed on the upper surface of the lens holding member 2. It is configured in. However, the protruding portion may be formed so as to extend from the spacer 1 as the fixed side member RG and enter the accommodating portion 2A. Alternatively, the protruding portion may be formed so as to extend from the outer portion 16e of the upper leaf spring 16 as the fixed side member RG and enter the accommodating portion 2A. Further, the protruding portion may be configured as a member different from the cover member 4 and the spacer 1.

Further, in the above-described embodiment, the accommodating portion 2A is formed on the upper surface of each of the four square wall portions 2C in the lens holding member 2 which is substantially rectangular in top view. However, the accommodating portion 2A may be formed on the upper surface of at least two of the four side portions constituting the lens holding member 2. The four side portions constituting the lens holding member 2 are portions facing the four side surfaces constituting the outer peripheral wall portion 4A of the cover member 4.

Further, although the magnet 5 is arranged so as to face two of the four side portions of the lens holding member 2, it may be arranged so as to face each of the four side portions, and the four magnets 5 may be arranged so as to face each of the four side portions. It may be arranged so as to face each of the square wall portions 2C. When the magnet 5 is arranged so as to face each of the four square wall portions 2C, the accommodating portion 2A may be formed on the upper surface of each of the four side portions constituting the lens holding member 2.

Further, in the above-described embodiment, the drive mechanism MK is a voice coil motor system having a coil 3 provided on the lens holding member 2 and a magnet 5 facing the coil 3. However, the drive mechanism is not limited to the voice coil motor system, and may be, for example, a piezoelectric drive system using a piezoelectric element or a drive system using a shape memory alloy wire.

This application claims priority based on Japanese Patent Application No. 2020-127785 filed on July 28, 2020, and the entire contents of this Japanese patent application are incorporated herein by reference.

1 ... Spacer 2 ... Lens holding member 2A ... Accommodation part 2A1 ... 1st accommodating part 2A2 ... 2nd accommodating part 2A3 ... 3rd accommodating part 2A4 ... 4th accommodating part 2C ... Square wall part 2C1 ... 1st corner wall part 2C2 ... 2nd corner wall part 2C3 ... 3rd corner wall part 2C4 ... 4th corner wall part 2P ... Convex part 2P1 ... 1st convex part 2P2 ... 2nd convex part 2P3 ... 3rd convex part 2P4 ... 4th convex part 2Q ... convex part 2Q1 ... 1st convex part 2Q2 ... 2 convex part 2Q3 ... 3rd convex part 2Q4 ... 4th convex part 2t ... protruding part 3 ... coil 4 ... cover member 4A ... outer peripheral wall part 4B ... ceiling part 4s ... Storage part 4T ... Folded piece 4T1 ... 1st bent piece 4T2 ... 2nd bent piece 4T3 ... 3rd bent piece 4T4 ... 4th bent piece 5 ... Magnet 5A ... 1st magnet 5B ... 2nd magnet 6 ... Leaf spring 7 ... Terminal member 7A ... 1st terminal member 7AP ... Exposed part 7AT ... Terminal part 7B ... No. 2 terminal member 7BP ... exposed part 7BT ... terminal part 7C ... 3rd terminal member 7CP ... connection part 7D ... 4th terminal member 7DP ... connection part 7DT ... terminal part 12・・・ Cylindrical part 12d ・・・ Pedestal part 12dh ・・・ Recessed part 12h ・・・ Eave part 12j ・・・ Coil support part 13 ・・・ Winding part 16 ・・・ Upper leaf spring 16b ・・・ Corner part 16e ... outer part 16g ... elastic arm part 16i ... inner part 16r ... crosspiece 18 ... base member 18k ... opening 18Q ... convex part 18Q1 ... first convex part 18Q2 ... 2nd convex part 18Q3 ... 3rd convex part 18Q4 ... 4th convex part 18t ... Protruding part 26 ... Lower leaf spring 26A ... 1st lower leaf spring 26B ...・ Second lower leaf spring 26c ・・・ inner joint part 26d ・・・ outer joint part 26e ・・・ outer part 26g ・・・ elastic arm part 26h ・・・ connection plate part 26i ・・・ inner part 26p ・・・Connecting

part

33, 33A, 33B ... Extension part 33c ... Opposing part 33k ... Insertion part 33m ... Winding part 52 ... Flange part 52k ...

Notch part

72, 72A, 72B ...・ Protruding part 82 ・・・ Jetty part 82s ・・・ Accommodating part 101 ・・・ Lens drive device AD ・・・ Adhesive BS ・・・ Bottom CA ・・・ Conductive Adhesive CS ... Ceiling surface DM ... Vibration damping material DM1 ... 1st damping material DM2 ... 2nd damping material DM3 ... 3rd damping material DM4 ... 4th damping material Material ED ... Tip HS ... Housing JD ... Optical axis MK ... Drive mechanism RG ... Fixed side member ST ... Regulatory part

Claims

Fixed side member and
A lens holding member that can hold the lens body and
A support member that movably supports the lens holding member in the optical axis direction,
In a lens driving device including a driving mechanism for moving the lens holding member in the optical axis direction.
The lens holding member has an accommodating portion with an open upper portion.
The fixed-side member has a protrusion whose tip is inserted into the accommodating portion.
A vibration damping material is housed in the housing section.
The tip of the protruding portion is in contact with the damping material provided in the accommodating portion.
A lens drive device characterized by that.
The fixed-side member includes a housing having an outer peripheral wall portion and a ceiling portion.
The lens holding member is arranged in the housing and
The protruding portion extends from the ceiling portion and is configured such that the tip portion is inserted into the accommodating portion.
The lens driving device according to claim 1.
The housing has a rectangular shape in a plan view and has a rectangular shape.
The lens holding member has a square wall portion corresponding to a corner portion of the housing.
The accommodating portion is formed on the square wall portion.
The lens driving device according to claim 2.
The support member is provided between the fixed side support portion fixed to the fixed side member, the movable side support portion fixed to the lens holding member, and the fixed side support portion and the movable side support portion. Includes leaf springs with elastic arms
The accommodating portion is formed at a position deviated from the center of the square wall portion.
The lens driving device according to claim 3.
The housing includes a metal cover member provided with the outer peripheral wall portion and the ceiling portion.
The protrusion is formed of a bent piece bent downward from the ceiling.
The lens driving device according to any one of claims 2 to 4.
The drive mechanism includes at least a coil provided on the lens holding member and a magnet facing the coil.
The coil is provided so as to surround the outer periphery of the lens holding member.
The cover member is made of a magnetic metal and has a plurality of the bent pieces.
A plurality of the accommodating portions are provided corresponding to the bent pieces.
The magnet is fixed to the inner surface of the outer peripheral wall portion of the cover member, and a part of the coil is arranged between at least one of the bent pieces and the magnet.
The lens driving device according to claim 5.
The fixed-side member has a regulating portion that regulates the upward movement of the lens holding member in the optical axis direction.
The accommodating portion is formed in a concave shape and has a bottom portion.
In a state where the lens holding member moves upward and comes into contact with the restricting portion, the protruding portion has a gap between the lens holding member and the bottom portion.
The lens driving device according to any one of claims 1 to 6.
The lens driving device according to any one of claims 1 to 7.
With the lens body
It has an image pickup element facing the lens body, and has.
The camera module.