阅读说明：本技术 透镜驱动装置以及照相机模块 (Lens driving device and camera module ) 是由 佐藤正和 长田宽志 菊池功武 于 2018-12-18 设计创作，主要内容包括：本发明的实施方式所涉及的透镜驱动装置(101)具备：被收容于筐体且能够保持透镜体的透镜保持部件(2)；被保持在透镜保持部件(2)的外侧的线圈(3)；以及与线圈(3)对置配置的磁铁(5),借助在线圈(3)流过的电流和磁铁(5)产生的磁场产生力而使由板簧(6)支承的透镜保持部件(2)沿着光轴(JD)的方向移动。在透镜保持部件(2)设置有粘附性的异物捕捉部件(50)。(A lens driving device (101) according to an embodiment of the present invention includes: a lens holding member (2) which is accommodated in the housing and can hold the lens body; a coil (3) held outside the lens holding member (2); and a magnet (5) disposed opposite to the coil (3), wherein the lens holding member (2) supported by the plate spring (6) is moved in the direction of the optical axis (JD) by a force generated by a current flowing through the coil (3) and a magnetic field generated by the magnet (5). An adhesive foreign matter capturing member (50) is provided on the lens holding member (2).)

1. A lens driving device is provided with:

a basket body;

a lens holding member which is accommodated in the housing and can hold the lens body;

a coil held outside the lens holding member; and

a magnet disposed to face the coil,

the lens holding member supported by the support member is moved in the optical axis direction by a force generated by a current flowing through the coil and a magnetic field generated by the magnet,

the lens holding member is provided with an adhesive foreign matter capturing member.

2. The lens driving device according to claim 1,

the housing includes a rectangular cover member,

the cover member has a top plate portion and a side plate portion,

the lens holding member has an outer wall portion facing an inner peripheral surface of the coil,

the outer wall portion includes corner wall portions arranged to correspond to the corner portions of the cover member,

the corner wall portion has a wall end surface facing the top plate portion,

the foreign matter catching member is provided on the wall end surface.

3. The lens driving device according to claim 2,

the foreign matter catching member is disposed in a groove formed in the wall end surface of the corner wall portion.

4. The lens driving device according to claim 3,

cut-out portions are formed in the opening formed in the top plate portion of the cover member so as to extend toward the corners of the cover member,

the groove is formed to correspond to the cut portion.

5. The lens driving device according to claim 3 or 4,

the groove is formed so as to be continuous with an outer surface of the outer wall portion facing an inner peripheral surface of the coil.

6. The lens driving device according to any one of claims 3 to 5,

the outer wall portion includes a side wall portion disposed to face the side plate portion of the cover member,

the groove portion is formed between 2 side wall portions located on both sides of the corner wall portion.

7. The lens driving device according to claim 6,

the groove portion is formed so as to be continuous with at least 1 outer surface of the side wall portion facing the inner peripheral surface of the coil.

8. The lens driving device according to claim 7,

a recessed portion recessed in a direction away from the inner circumferential surface of the coil is formed on at least 1 outer surface of the side wall portion,

the groove portion is formed so as to be continuous with the recessed portion.

9. The lens driving device according to any one of claims 2 to 8,

the foreign matter catching member is formed by curing the adhesive,

the coil is fixed to the outer wall portion by the adhesive.

10. The lens driving device according to any one of claims 2 to 9,

the lens holding member includes:

a first protruding portion formed to protrude outward; and

a second protrusion formed to protrude outward toward the side plate of the cover member,

the second protruding portion is formed to face the first protruding portion in the optical axis direction,

the coil is disposed between the first protruding portion and the second protruding portion in the optical axis direction.

11. The lens driving device according to any one of claims 2 to 10,

the wall end surface of the corner wall portion is a flat surface perpendicular to the optical axis,

an end surface of the coil disposed to face the top plate of the cover member is flush with the wall end surface.

12. The lens driving device according to any one of claims 1 to 11,

the housing includes a base member facing the lens holding member,

a plurality of banks are provided at an edge of an opening formed in the base member.

13. A camera module having:

a lens driving device according to any one of claims 1 to 12;

the lens body; and

and an imaging element facing the lens body.

Technical Field

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

Background

Conventionally, a lens driving device including a lens holder (lens holding member), a coil arranged on the outer periphery of the lens holding member, a plate spring supporting the lens holding member so as to be movable in the optical axis direction, and a base (base member) is known (see patent document 1).

In the lens driving device, a dust capturing agent for capturing foreign matter such as dust is applied to the base member.

Disclosure of Invention

Problems to be solved by the invention

However, with regard to ensuring an area on the base member to which the dust-catching agent is applied, it is more difficult to make the diameter of the lens body larger. This is because the vacant space on the base member becomes small. Further, if the area to which the dust trapping agent is applied is limited, foreign matter that has intruded into the housing of the lens driving device may pass through the housing and reach an imaging device including an imaging element, a filter, and the like.

Therefore, it is desirable to provide a lens driving device capable of more reliably suppressing or preventing foreign matter intruding into a housing from reaching an imaging device.

Means for solving the problems

The lens driving device according to an embodiment of the present invention includes: a basket body; a lens holding member which is accommodated in the housing and can hold the lens body; a coil held outside the lens holding member; and a magnet disposed to face the coil, the magnet generating a force by a current flowing through the coil and a magnetic field generated by the magnet to move the lens holding member supported by the support member in the optical axis direction, wherein the lens holding member is provided with an adhesive foreign matter capturing member.

Effects of the invention

According to the above aspect, a lens driving device capable of more reliably suppressing or preventing foreign matter intruding into a housing from reaching an imaging device is provided.

Drawings

Fig. 1 is an exploded perspective view of a lens driving device.

Fig. 2A is an upper perspective view of the lens driving device.

Fig. 2B is a front view of the lens driving device.

Fig. 3A is a plan view of the lens driving device.

Fig. 3B is a bottom view of the lens driving device.

Fig. 4A is an upper perspective view of the lens driving device in a state where the housing is detached.

Fig. 4B is a left side view of the lens driving device in a state where the housing is detached.

Fig. 5A is an upper perspective view of the lens holding member.

Fig. 5B is an upper perspective view of the lens holding member.

Fig. 6A is a lower perspective view of the lens holding member.

Fig. 6B is a lower perspective view of the lens holding member.

Fig. 7A is a plan view of the lens holding member.

Fig. 7B is a right side view of the lens holding member.

Fig. 8A is a lower perspective view of the lens holding member.

Fig. 8B is a lower perspective view of the lens holding member.

Fig. 9A is an enlarged view of a part of the lens holding member.

Fig. 9B is an enlarged view of a part of the lens holding member.

Fig. 10A is a bottom view of the lens driving device with parts omitted.

Fig. 10B is a bottom view of the lens driving device in a state in which parts are omitted.

Fig. 11A is a plan view of the upper leaf spring.

Fig. 11B is a bottom view of the lower leaf spring.

Fig. 12A is a diagram illustrating an example of connection between a leaf spring and a coil in the lens driving device.

Fig. 12B is a diagram illustrating an example of connection between the leaf spring and the coil in the lens driving device.

Fig. 13A is an upper perspective view of the base member.

Fig. 13B is an upper perspective view of the base member.

Fig. 14 is a plan view of the lens holding member.

Fig. 15 is a plan view of the upper leaf spring.

Fig. 16 is a top view of the base member.

Fig. 17 is a top view of the housing.

Fig. 18A is an upper perspective view of the corner wall portion of the lens holding member and the foreign substance capturing member.

Fig. 18B is an upper perspective view of the corner wall portion of the lens holding member and the foreign substance capturing member.

Fig. 18C is an upper perspective view of the corner wall portion of the lens holding member.

Fig. 18D is an upper perspective view of the foreign substance capturing member.

Fig. 19A is a sectional view of the lens holding member, the coil, the housing, and the magnet.

Fig. 19B is a sectional view of the lens holding member, the coil, the housing, and the magnet.

Detailed Description

Hereinafter, a lens driving device 101 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of a lens driving device 101. Fig. 2A is an upper perspective view of the lens driving device 101, and fig. 2B is a front view of the lens driving device 101 as viewed from the Y2 side. Fig. 3A is a plan view of the lens driving device 101, and fig. 3B is a bottom view of the lens driving device 101. Fig. 4A is an upper perspective view of the lens driving device 101 in a state where the housing 4 is removed, and corresponds to fig. 2A. Fig. 4B is a left side view of the lens driving device 101 in a state where the housing 4 is detached, as viewed from the X2 side.

As shown in fig. 1, the lens driving device 101 includes: a lens holding member 2 capable of holding a lens body (not shown); a drive mechanism MK for moving the lens holding member 2 in the optical axis direction (Z-axis direction) of the lens body; a plate spring 6 as a support member that supports the lens holding member 2 so as to be movable in the optical axis direction; and a fixed-side member RG to which the plate spring 6 is fixed. The lens body is, for example, a cylindrical lens barrel including at least 1 lens, and is configured such that the central axis thereof is along the optical axis direction. The optical axis direction includes a direction of an optical axis JD of the lens body LS and a direction parallel to the optical axis JD.

As shown in fig. 1, the drive mechanism MK includes a coil 3 wound in a ring shape and 4 magnets 5 arranged to face the coil 3. The fixed-side member RG includes: a rectangular box-shaped housing 4 as a cover member; and a base member 18 in which the metal member 7 is embedded.

As shown in fig. 3B, the metal member 7 includes terminals 7A, 7B, and 7C for electrically connecting to the outside. The plate spring 6 includes: an upper plate spring 16 disposed between the lens holding member 2 and the housing 4; and 2 lower leaf springs 26A and 26B arranged between the lens holding member 2 and the base member 18.

As shown in fig. 2A, the housing 4 is coupled to the base member 18 to form a housing together with the base member 18. The housing 4 has: a rectangular annular outer peripheral wall portion 4G; and a top plate 4B which is provided so as to be continuous with the upper end (end on the Z1 side) of the outer peripheral wall portion 4G and has a flat plate shape except for the corner portion 4C.

The outer peripheral wall portion 4G includes 4 side plate portions 4A formed in a flat plate shape. Specifically, the side plate 4A includes: a pair of first side plate portions 4a1 opposed to each other; and a pair of second side plate portions 4a2 perpendicular to and opposed to the first side plate portion 4a 1. Between the adjacent first side plate portion 4a1 and second side plate portion 4a2, there is a curved plate portion 4R connecting the two. The inner side of the curved panel portion 4R corresponds to a corner portion 4C constituting four corners of the top panel portion 4B. A substantially circular opening 4k is formed in the center of the top plate 4B. Further, a cutout 4kc is formed in the opening 4k so as to spread toward the corner 4C. The cutout portion 4kc is used to hold the lens holding member 2 when the lens body is attached to the lens holding member 2, for example. However, the cutout 4kc may be omitted. Corner 4C includes a first corner 4C1, a second corner 4C2, a third corner 4C3, and a fourth corner 4C 4. The cutout 4kc includes first to fourth cutouts 4kc1 to 4kc4 disposed to face the first to fourth corners 4C1 to 4C4, respectively. The corner portion 4C is formed recessed downward (in the Z2 direction) from the flat plate-shaped surface of the top plate portion 4B. This is for sandwiching the upper leaf spring 16 between the lower surface (surface on the Z2 side) of the corner 4C and the upper surface (surface on the Z1 side) of the magnet 5. The corner 4C constitutes a part of the top plate 4B of the housing 4 as described above.

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

The lens driving device 101 realizes an autofocus function by moving the lens holding member 2 in the optical axis direction on the Z1 side (object side) of the photographing element by the electromagnetic force. Specifically, the lens driving device 101 can move the lens holding member 2 in a direction away from the image pickup device to perform macro image pickup, and can move the lens holding member 2 in a direction close to the image pickup device to perform infinity image pickup.

Next, the lens holding member 2 and the drive mechanism MK will be described. Fig. 5A is an upper perspective view of the lens holding member 2, and fig. 5B is an upper perspective view illustrating a state in which the coil 3 is wound around the lens holding member 2 of fig. 5A. Fig. 6A is a lower perspective view of the lens holding member 2, and fig. 6B is a lower perspective view showing a state in which the coil 3 is wound around the lens holding member 2 of fig. 6A. Fig. 7A is a plan view of the lens holding member 2, and fig. 7B is a right side view of the lens holding member 2 as viewed from the X1 side. Fig. 8A is a lower perspective view of the lens holding member 2, and fig. 8B is a lower perspective view showing a state in which the coil 3 is wound around the lens holding member 2 shown in fig. 8A. Fig. 9A is an enlarged view of a portion S shown in fig. 8B, and fig. 9B is an enlarged view of a portion P shown in fig. 6B. Fig. 10A is a bottom view of the lens driving device 101 in a state where the metal member 7 and the base member 18 are omitted, and fig. 10B is a bottom view of the lens driving device 101 in a state where the lower plate springs 26A, the lower plate springs 26B, and the lens holding member 2 are further omitted.

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 includes: a cylindrical portion 12 formed to penetrate in the optical axis direction; and a flange portion (flange-like portion) 52 as a first protruding portion formed on the imaging element side (Z2 side) in the optical axis direction. In the present embodiment, the flange portion 52 is formed to protrude radially outward, that is, in a direction perpendicular to the optical axis direction. The cylindrical portion 12 is formed in a cylindrical shape on the object side (Z1 side) of the flange portion 52.

In the present embodiment, the cylindrical portion 12 is provided with a screw groove on an inner peripheral surface thereof so as to mount a lens body. However, the lens body may be fixed to the cylindrical portion 12 with an adhesive. In this case, the thread groove may be omitted. Further, in the cylindrical portion 12, a pedestal portion 12d having a recess 12dh is provided at 4 across the optical axis JD on the end surface on the object side. As shown in fig. 4A, the inner portion 16i of the upper leaf spring 16 is placed on the base portion 12d and fixed thereto with an adhesive.

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 cylindrical portion 12. In the present embodiment, the coil support portion 12j has an outer shape having an octagonal shape in a plan view so as to be able to support the octagonal ring-shaped coil 3. Specifically, the coil support portion 12j includes: 4 corner wall portions 12C arranged to correspond to the corners of the case 4, respectively; and 4 side wall portions 12S arranged to face the side plate portion 4A (the first side plate portion 4A1 and the second side plate portion 4A2) of the case 4. The coil 3 is present between the coil support portion 12j and the outer peripheral wall portion 4G of the case 4. Therefore, the side wall portion 12S faces the side plate portion 4A of the case 4 with the coil 3 interposed therebetween. Further, the coil support portion 12j is configured to have an octagonal annular outer shape, and the corner wall portions 12C and the side wall portions 12S are alternately arranged. More specifically, the corner wall 12C includes first to fourth corner walls 12C1 to 12C4 disposed to face (correspond to) the first to fourth corners 4C1 to 4C4, respectively. The side wall portion 12S includes: a first side wall portion 12S1 located between the first corner wall portion 12C1 and the second corner wall portion 12C 2; and a second side wall portion 12S2 between the second corner wall portion 12C2 and the third corner wall portion 12C 3. Similarly, the side wall portion 12S includes: a third side wall portion 12S3 (not visible in fig. 5A; refer to fig. 8A.) located between the third and fourth corner wall portions 12C3 and 12C 4; and a fourth side wall portion 12S4 (not visible in fig. 5A; see fig. 7B.) located between the fourth corner wall portion 12C4 and the first corner wall portion 12C 1.

The 4 corner wall portions 12C have wall end surfaces FS facing the top plate portion 4B of the housing 4. A groove 50R for disposing the foreign substance catching member 50 (see fig. 5B) is formed on the wall end face FS. Specifically, the wall end faces FS include first to fourth wall end faces FS1 to FS4 disposed so as to face (correspond to) the first to fourth corners 4C1 to 4C4, respectively. The groove 50R includes first to fourth grooves 50R1 to 50R4 formed in the first to fourth wall end faces FS1 to FS4, respectively. The foreign matter capturing member 50 further includes first to fourth foreign matter capturing members 50-1 to 50-4 provided in the first to fourth groove portions 50R1 to 50R4, respectively. In the present embodiment, the wall end face FS is formed of a flat surface perpendicular to the optical axis JD. This is for easy attachment to a jig used when winding the coil 3 around the lens holding member 2. In this case, as shown in fig. 5B, coil 3 is wound around lens holding member 2 such that end surface 3T on the Z1 side of coil 3 faces top plate 4B of case 4 and end surface 3T is flush with wall end surface FS. The bottom surface of the groove portion 50R is constituted by a flat surface perpendicular to the optical axis JD. However, the bottom surface of the groove portion 50R may be inclined with respect to the direction perpendicular to the optical axis JD.

The foreign matter catching member 50 is provided with a function of catching foreign matters such as dust and the like entering the housing through the opening 4k of the housing 4Adhesive (wrinkled) parts. In the present embodiment, the foreign matter capturing member 50 is provided on the wall end face FS of the corner wall portion 12C. However, it may be provided on the outer wall of the cylindrical portion 12 extending in the optical axis direction. The member having adhesiveness (drape property) includes an adhesive binder, an adhesive resin, or the like. The foreign substance catching member 50 may be a double-sided tape attached to the wall end FS of the corner wall portion 12C. In this case, the groove portion 50R may be omitted. Alternatively, the foreign matter capturing member 50 may be a member that protrudes upward (in the Z1 direction) from the wall end FS of the corner wall portion 12C. In the present embodiment, the foreign substance capturing member 50 is formed of the same adhesive as that used for bonding the lens holding member 2 and the coil 3. Specifically, the foreign substance capturing member 50 is formed by curing an adhesive, and the coil 3 is fixed to the coil support portion 12j, which is the outer wall portion of the lens holding member 2, via the adhesive. In the case of being formed of an adhesive, the foreign substance capturing member 50 is not coated randomly but is coated in a predetermined shape. In the present embodiment, the foreign substance capturing member 50 is coated so as to extend in an arc shape around the optical axis JD and have a surface area corresponding to 30 to 40% of the surface area of the corresponding wall end face FS (including the groove portion 50R) as shown in fig. 5B. In the present embodiment, the surface area of the portion appearing on the Z1 side of one foreign substance capturing member 50 is 0.34[ mm ]²]Left and right.

On the object side of the coil support portion 12j, a flange portion 12h as a second protruding portion protruding outward in the radial direction so as to face the flange portion 52 as a first protruding portion in the optical axis direction is formed at 4. In the present embodiment, the brim portion 12h is formed so as to protrude outward, i.e., in a direction perpendicular to the optical axis direction, toward the side plate portion 4A (the first side plate portion 4A1 and the second side plate portion 4A2) of the case 4. Further, as shown in fig. 5B, the coil 3 is annularly wound around the outer peripheral surface side of the lens holding member 2 so as to be supported by the coil support portion 12j and sandwiched between the flange portion 12h and the flange portion 52 in the optical axis direction.

The flange portion 52 projects radially outward from the outer peripheral surface of the cylindrical portion 12 at the imaging element side (Z2 side). The coil 3 is disposed on the object side of the flange portion 52. As shown in fig. 6B, 2 cutout portions 52k are formed in the flange portion 52 so as to sandwich the optical axis JD of the lens body. Further, the extension 33A which is the wire material on the winding start end side of the coil 3 passes through one of the cut portions 52k, and the extension 33B which is the wire material on the winding end side of the coil 3 passes through the other of the cut portions 52 k. The edge portion of the flange portion 52 forming the cutout portion 52k is configured to be bent. This is to prevent or suppress the wire breakage of the coil 3 contacting the edge portion.

As shown in fig. 6A, the flange portion 52 includes: 2 holding portions 72 protruding downward (Z2 direction) from the surface on the imaging element side (Z2 side) and having a square convex shape; 6 protruding parts 2t in a circular convex shape; and 2 bank portions 82 formed of 3 wall portions (inner wall portion 82u, outer wall portion 82v, side wall portion 82 w).

As shown in fig. 6B, the holding portion 72 includes: a holding portion 72A corresponding to the winding start end side of the coil 3 (winding portion 13); and a holding portion 72B corresponding to the winding end side of the coil 3 (winding portion 13). Both ends of the coil 3 are wound around the holding portion 72 and held.

As shown in fig. 6A and 10A, the protruding portion 2t includes: 3 protruding portions 2t corresponding to the lower leaf spring 26A; and 3 protruding portions 2t corresponding to the lower leaf spring 26B. An inner portion 26i of each of the lower leaf springs 26A and 26B is attached and fixed to the protruding portion 2 t. The inner portions 26i of the lower leaf springs 26A and 26B are fixed by hot riveting the protruding portions 2t inserted through the through holes formed in the inner portions 26 i. In addition, the hot riveting may be cold riveting. In fig. 6A and 6B, the protruding portion 2t is shown in a state in which the tip after hot riveting is deformed. The same applies to other figures.

The levee 82 includes, as shown in fig. 6A: an inner wall portion 82u located on the center side of the lens holding member 2; an outer wall portion 82v located on the outer side opposite to the inner wall portion 82 u; and a side wall portion 82w located between the inner side wall portion 82u and the outer side wall portion 82v on a side close to the holding portion 72. As shown in fig. 9A, an opening 82z with a wall cut out is formed on the side of the levee 82 remote from the holding portion 72. Further, a space surrounded by 3 wall portions (inner wall portion 82u, outer wall portion 82v, and side wall portion 82w) forms a housing portion 82 s. In the present embodiment, the bank portion 82 is formed at a position adjacent to the holding portion 72, and therefore, the side wall of the holding portion 72 is suitably used as the side wall portion 82w of the bank portion 82. Therefore, the housing portion 82s is provided at a position adjacent to the holding portion 72. The receiving portion 82s located near the holding portion 72A is configured to be able to receive a conductive adhesive for connecting the extending portion 33A of the coil 3 and the lower plate spring 26A. Similarly, the receiving portion 82s located in the vicinity of the holding portion 72B is configured to be able to receive a conductive adhesive for connecting the extending portion 33B of the coil 3 and the lower plate spring 26B.

Next, the driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10B, the drive mechanism MK includes: a coil 3; and 4 magnets 5 arranged to face the 4 side plate portions 4A (the first side plate portion 4A1 and the second side plate portion 4A2) constituting the case 4. Further, the driving mechanism MK can generate a driving force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnet 5, and can move the lens holding member 2 up and down in the optical axis direction.

The coil 3 is formed by winding a conductive wire around the outer periphery of the lens holding member 2 as shown in fig. 6B. The coil 3 includes: a winding portion 13 formed by winding in a ring shape; and an extension portion 33 extending from the winding portion 13 and wound around the holding portion 72. In fig. 6B, the winding portion 13 is not illustrated in a detailed wound state of the conductive wire material whose surface is covered with the insulating member for clarity. The same applies to other drawings showing the winding portion 13.

The extension 33 includes: an extension portion 33A connected to an end portion (winding start end portion) of the winding portion 13 located on the inner circumferential side of the winding portion 13 on the winding start end side of the coil 3; and an extension portion 33B 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.

Specifically, the extension 33A includes, as shown in fig. 9A: a winding portion 33m wound around the holding portion 72A; a connecting portion 33c extending to face the inner bottom surface of the housing portion 82 s; and an insertion portion 33k inserted through the cutout portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 toward the object side (Z1 side). Also, the extension 33B includes, as shown in fig. 9B: a winding portion 33m wound around the holding portion 72B; a connecting portion 33c extending to face the inner bottom surface of the housing portion 82 s; and an insertion portion 33k inserted through the cutout portion 52k and extending from the imaging element side (Z2 side) of the flange portion 52 toward the object side (Z1 side).

In the present embodiment, the extension portion 33A is wound around the holding portion 72A of the lens holding member 2 before the wire of the coil 3 is wound around the outer periphery of the lens holding member 2, that is, before the wound portion 13 is formed. In the example shown in fig. 9A, a part of the wire of the coil 3 is wound around the holding portion 72A by 3 turns. Thereby, the winding portion 33m is formed in the holding portion 72A, and a part of the extension portion 33A is held by the holding portion 72A. However, the extension 33A may be wound around the holding portion 72A after the wire of the coil 3 is wound around the outer periphery of the lens holding member 2.

Next, the wire is wound around the outer periphery of the lens holding member 2. At this time, as shown in fig. 9A, the wire extending from the winding portion 33m faces the inner bottom surface of the housing portion 82s, and is cut out through the wall portion to form an open portion 82 z. Further, the wire extends from the lower side of the flange portion 52 toward the upper side of the flange portion 52 through the cutout portion 52 k. At this time, the portion facing the inner bottom surface of the housing portion 82s constitutes the connection portion 33c of the extension portion 33A, and the portion passing through the cutout portion 52k constitutes the insertion portion 33k of the extension portion 33A.

The insertion portion 33k of the extension portion 33A is configured to contact the edge portion of the flange portion 52 when extending from the lower side to the upper side of the flange portion 52 as shown in fig. 9A. Therefore, when a strong impact is applied to the lens driving device 101 due to dropping or the like, the extension portion 33A of the coil 3 is pressed against the edge portion of the flange portion 52. In the present embodiment, the edge portion of the flange portion 52 is configured to be curved. Therefore, the extending portion 33A is hardly cut by the edge portion of the flange portion 52. The edge portion of the flange portion 52 that contacts the extension portion 33B may also be curved.

The winding portion 13 of the coil 3 wound around the outer periphery of the lens holding member 2 is disposed at a position surrounding the periphery of the lens holding member 2 as shown in fig. 5B. The winding portion 13 is fixed to the flange portion 52 on the object side so as to be sandwiched between the flange portion 52 and the brim portion 12h in a state of being supported from the inside by the coil support portion 12j (see fig. 5A). Since the inner peripheral surface of the winding portion 13 is supported by the coil support portion 12j in an isotropic balance manner, the winding portion 13 is held by the lens holding member 2 in a state where the central axis of the coil 3 coincides with the central axis of 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, respectively.

When the winding of the wire rod around the outer periphery of the lens holding member 2 is completed, the extension portion 33B connected to the end portion on the winding end side of the winding portion 13 is drawn out from the object side of the flange portion 52 toward the imaging element side of the flange portion 52 via the cutout portion 52k as shown in fig. 9B. Specifically, the insertion portion 33k passes through the cutout portion 52k, the connection portion 33c passes through the opening portion 82z of the protruding bank portion 82 and extends to face the inner bottom surface of the housing portion 82s, and the winding portion 33m is wound around the holding portion 72B of the lens holding member 2. In the example shown in fig. 9B, the extending portion 33B is wound around the holding portion 72B by 3 turns.

In the bank portion 82, an opening portion 82z having a wall portion cut out is formed on the side away from the holding portion 72B. The connecting portion 33c of the extension portion 33B extends through the opening portion 82 z. With this configuration, interference between the levee 82 and the extending portion 33B is avoided, an increase in the gap between the lens holding member 2 and the lower plate spring 26B is avoided, and an increase in the size of the lens driving device 101 in the optical axis direction can be suppressed.

Next, the case 4 will be explained. In the present embodiment, the case 4 is manufactured by punching and drawing a plate material made of a nonmagnetic metal such as austenitic stainless steel. Since the housing 4 is formed of a nonmagnetic metal, even when another lens driving device is disposed adjacent to the lens driving device 101 in a two-lens camera type portable device or the like, the configuration of the driving machine included in the other lens driving device is not magnetically adversely affected. Specifically, the housing 4 has a box-like outer shape defining the housing portion 4s as shown in fig. 2A. Further, the housing 4 includes: a rectangular annular outer peripheral wall portion 4G; and a top plate 4B which is provided so as to be continuous with the upper end (end on the Z1 side) of the outer peripheral wall portion 4G and has a flat plate shape except for the corner portion 4C. The outer peripheral wall portion 4G includes 4 side plate portions 4A formed in a flat plate shape. The case 4 configured as described above is configured to house the coil 3 and the magnet 5 in the housing portion 4s as shown in fig. 10B, and is coupled to the base member 18 to form a housing together with the base member 18 as shown in fig. 2A. However, the case 4 may be replaced with a cover made of a magnetic metal such as iron. In this case, the case 4 functions as a yoke.

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. 1, and is disposed so as to extend in a direction (X-axis direction or Y-axis direction) perpendicular to the optical axis direction. Further, as shown in fig. 10B, the 4 magnets 5 are located outside the coil 3 and arranged along the 4 side plate portions 4A (the first side plate portion 4A1 and the second side plate portion 4A2) constituting the case 4. Further, the side plates are fixed to the inner surfaces of the side plate portions 4A with an adhesive. The magnet 5 is disposed such that, for example, the inside is an N-pole and the outside is an S-pole.

Next, the leaf spring 6 and the fixed-side member RG will be described. Fig. 11A and 11B are diagrams for explaining the plate spring 6. Fig. 11A is a plan view of the upper leaf spring 16, and fig. 11B is a bottom view of the lower leaf spring 26A and the lower leaf spring 26B. Fig. 12A and 12B are diagrams illustrating an example of a connection state between the lower leaf spring 26A and the coil 3. Specifically, fig. 12A is an enlarged view of the portion T shown in fig. 10A, and fig. 12B is an enlarged view of the lower plate spring 26A, the coil 3, and the lens holding member 2 when the portion T shown in fig. 10A is viewed from the X2 side. In fig. 12A and 12B, the conductive adhesive CA is shown with cross hatching for the sake of easy understanding. Fig. 13A and 13B are views for explaining base member 18 as stationary-side member RG. Specifically, fig. 13A is an upper perspective view of the base member 18, and fig. 13B is an upper perspective view showing a state in which the lower leaf spring 26A and the lower leaf spring 26B are assembled to the base member 18.

The plate spring 6 is made of a metal plate mainly made of copper alloy. As shown in fig. 1, the plate spring 6 includes: an upper plate spring 16 disposed between the lens holding member 2 and the housing 4; and a lower plate spring 26A and a lower plate spring 26B disposed between the lens holding member 2 and the base member 18. In a state where the lens holding member 2 is engaged with the plate spring 6 (the upper plate spring 16, the lower plate spring 26A, and the lower plate spring 26B), the plate spring 6 supports the lens holding member 2 in the air so that the lens holding member 2 can move in the optical axis direction (Z-axis direction). The lower plate springs 26A and 26B function as power supply means for supplying current to the coil 3. Therefore, the lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. A spacer may be disposed between the upper leaf spring 16 and the housing 4. This is to prevent the lens holding member 2 from colliding with the housing 4 when the lens holding member 2 moves in the Z1 direction.

As shown in fig. 11A, the upper leaf spring 16 has a substantially rectangular shape, and includes: an inner portion 16i fixed to the lens holding member 2; an outer portion 16e fixed to fixed-side member RG; and 4 resilient arm portions 16g located between the inner portion 16i and the outer portion 16 e. Specifically, the upper leaf spring 16 is formed in a frame shape, and has 2 inner portions 16i provided to face each other across the center. The outer portion 16e has: 4 corner portions 16 b; and 4 stacks 16r connecting adjacent 2 corner portions 16 b. Both ends of the stack portion 16r and a part of the corner portion 16B are sandwiched and fixed by the corner portion 4C constituting a part of the top plate portion 4B of the case 4 and the magnet 5. Thus, the housing 4 and the magnet 5 function as the fixed-side member RG. The elastic arm portion 16g includes: first to fourth elastic arm portions 16g1 to 16g4 are disposed so as to correspond to the first to fourth corners 4C1 to 4C4, respectively, of the case 4. The first elastic arm portion 16g1 to the fourth elastic arm portion 16g4 are located inside (on the optical axis JD side) the corresponding first corner portion 4C1 to fourth corner portion 4C 4. That is, the first elastic arm portion 16g1 to the fourth elastic arm portion 16g4 are configured such that the elastic deformation thereof is not hindered by the first corner portion 4C1 to the fourth corner portion 4C 4.

When the upper plate spring 16 is assembled to the lens driving device 101, as shown in fig. 4A, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (see fig. 5A). Further, the inner portion 16i and the base portion 12d are fixed by an adhesive, whereby the inner portion 16i is fixed to the lens holding member 2. As shown in fig. 4B, the outer portion 16e is in contact with the upper surface (surface on the Z1 side) of the magnet 5, and is sandwiched and fixed between the lower surface (not shown in fig. 4B) of the corner portion 4C of the top plate portion 4B and the upper surface of the magnet 5.

The upper leaf spring 16 is formed substantially bilaterally symmetrically as shown in fig. 11A. Further, the inner portion 16i is fixed to the lens holding member 2, and the outer portion 16e is fixed to the housing 4. Therefore, the upper leaf spring 16 can support the lens holding member 2 in the air with good balance.

As shown in fig. 11B, the lower leaf spring 26A and the lower leaf spring 26B are configured such that their inner shapes are semicircular. Further, the method includes: an inner portion 26i fixed to the lens holding member 2 on the imaging element side; outer portion 26e fixed to stationary-side member RG; and an elastic arm portion 26g located between the inner portion 26i and the outer portion 26 e.

As shown in fig. 11B, the inner portion 26i of each of the lower leaf springs 26A and 26B includes: 3 inner bonding portions 26c to be engaged with the lens holding member 2; 2 first connecting portions 26p connecting between the 3 inner joining portions 26 c; and a web portion 26h opposed to the extension portion 33 of the coil 3.

When the lower leaf springs 26A and 26B are assembled to the lens drive device 101, the 6 protruding portions 2t of the lens holding member 2 shown in fig. 6A are inserted into and fitted into circular through holes provided in the inner joint portions 26c of the lower leaf springs 26A and 26B shown in fig. 11B. Thereby, the inner portions 26i of the lower leaf springs 26A and 26B are positioned and fixed to the lens holding member 2. The lower leaf springs 26A and 26B are fixed to the lens holding member 2 by, for example, hot riveting or cold riveting the protruding portions 2t of the lens holding member 2.

Hereinafter, the relationship between the lower plate spring 26A, the lens holding member 2, and the coil 3 will be mainly described. However, the description about the lower leaf spring 26A is also applied to the lower leaf spring 26B.

As shown in fig. 12B, the connecting plate portion 26h of the inner portion 26i of the lower leaf spring 26A faces the bank portion 82 of the lens holding member 2 when the lens driving device 101 is assembled. That is, the surface of the land portion 26h on the object side (Z1 side) faces the housing portion 82s formed by the bank portion 82 as shown in fig. 12A. Further, as shown in fig. 12B, the connection portion 33c of the extension portion 33A of the coil 3 extends between the object-side surface of the inner portion 26i of the lower leaf spring 26A and the imaging element-side (Z2-side) surface of the flange portion 52 of the lens holding member 2.

As shown in fig. 12A, the connecting plate portion 26h of the inner portion 26i is provided with 2 cutouts as the penetrating portions 26t at positions facing the opening portions 82z of the levee portion 82, and is provided with U-shaped cutout portions 26k at positions facing the outer wall portions 82 v. The through portion 26t is provided at a position corresponding to each end portion of the inner wall portion 82u and the outer wall portion 82v of the bank portion 82 in a bottom view, and an end surface 26x constituting the through portion 26t is provided so as to cover these end portions. With this arrangement, the penetrating portion 26t prevents the conductive adhesive CA from flowing over the surface of the lower leaf spring 26A on the Z1 side and spreading toward the Y2 side. The cut-out portion 26k prevents the conductive adhesive CA from flowing over the surface of the lower leaf spring 26A on the Z1 side and spreading toward the outer wall portion 82v side (X2 side). That is, the inner wall 82u (X1) is easily expanded. This is to cover the entire periphery of the connection portion 33c with the conductive adhesive CA.

When the lower leaf spring 26A is assembled to the lens holding member 2, as shown in fig. 12B, the holding portion 72A protrudes downward (Z2 direction) from the inner portion 26i of the lower leaf spring 26A so that the tip thereof is positioned on the imaging element side (Z2 side) of the inner portion 26 i. Further, a part of the winding portion 33m is also wound around the holding portion 72A so as to be positioned on the imaging element side (Z2 side) of the inner portion 26 i.

The lower plate spring 26A and the extension 33A of the coil 3 are electrically and mechanically connected to each other by a conductive adhesive CA in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before the lower plate spring 26A is assembled to the lens holding member 2, the conductive adhesive CA is applied to the housing portion 82s surrounded by the bank portion 82 of the lens holding member 2, and then the lower plate spring 26A is assembled to the lens holding member 2. Further, the projecting portion 2t of the lens holding member 2 is hot-riveted and the conductive adhesive CA is thermally cured. The step of applying the conductive adhesive CA to the housing portion 82s from the conductive adhesive CA and thermosetting the conductive adhesive CA is performed in a state where the lens holding member 2 is inverted so that the holding portion 72 protrudes vertically upward. Therefore, the conductive adhesive CA can be appropriately held at a desired position (position within the housing portion 82 s) even when it has fluidity. Further, since a part of the connection portion 33c is disposed in the housing portion 82s, it is buried in the conductive adhesive CA. The conductive adhesive CA is not limited to the heat-curable type, and may be an ultraviolet-curable type.

The lower plate spring 26A and the extending portion 33A of the coil 3 may be electrically connected by soldering without using the conductive adhesive CA. In this case, the brazing material is disposed on the Z2 side of the lower plate spring 26A, and electrically connects the lower plate spring 26A and the extension portion 33A.

As shown in fig. 11B, the outer portion 26e of the lower leaf spring 26A includes: 2 outer engaging portions 26d that engage with the base member 18; and a second coupling portion 26q that connects the 2 outer joint portions 26 d. The through hole provided in the outer engaging portion 26d of the lower leaf spring 26A is fitted into a protruding portion 18t (see fig. 13A) provided on the upper surface of the base member 18. Thereby, the outer portion 26e of the lower leaf spring 26A is positioned and fixed to the base member 18.

The lower leaf spring 26A and the lower leaf spring 26B are formed substantially bilaterally symmetrically as shown in fig. 11B. Further, the lower plate spring 26A is connected to the lens holding member 2 at 3 inner engaging portions 26c, and is connected to the base member 18 at 2 outer engaging portions 26 d. The same applies to the lower leaf spring 26B. With this configuration, the lower leaf springs 26A and 26B can support the lens holding member 2 in the air in a state of being movable in the optical axis direction with good balance.

Next, the stationary-side member RG will be explained. The fixed-side member RG includes: a housing 4 and a magnet 5 for fixing the upper plate spring 16; and a base member 18 that fixes the lower plate spring 26A and the lower plate spring 26B, respectively.

The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. Further, the base member 18 is disposed below the lens holding member 2 (on the Z2 side) so as to face the lens holding member 2 in the optical axis direction. In the present embodiment, the base member 18 is a member having a rectangular plate-like outer shape as shown in fig. 13A, and a circular opening 18k is formed at the center. Further, a bank portion 18D is provided at an edge portion of the opening 18 k. The levee 18D is configured to prevent foreign matter such as dust that has entered the housing through the opening 4k of the housing 4 from reaching the imaging element or a filter (hereinafter referred to as "imaging element or the like") provided thereon through the opening 18 k. The banks 18D are formed intermittently along the edge portions of the openings 18k so as to surround the openings 18 k. In the present embodiment, the opening 18k is surrounded by 8 portions (the first to eighth banks 18D1 to 18D8) divided by 8 cutout portions. The notch portion is formed to prevent the projection portion 2t or the like projecting from the lower surface (surface on the Z2 side) of the lens holding member 2 from coming into contact with the bank portion 18D. A foreign substance capturing member similar to the foreign substance capturing member 50 provided in the lens holding member 2 may be provided around the bank portion 18D. For example, the foreign material catching member may be provided in the circumferential direction along the bank portion 18D on the radially outer side of the bank portion 18D. The foreign substance catching member may be provided on the outer wall of the bank 18D extending in the optical axis direction.

Further, on the surface (upper surface) of the base member 18 on the object side (Z1 side), 6 projecting portions 18t projecting upward are provided. The protruding portion 18t is inserted and fitted into a through hole provided in the outer joining portion 26d of each of the lower leaf spring 26A and the lower leaf spring 26B. At this time, the protruding portion 18t is fixed to the outer joining portion 26d by hot riveting. In addition, the hot riveting may be cold riveting. In fig. 13A and 13B, the protruding portion 18t is shown in a state in which the tip end after the hot caulking is deformed. The same applies to other figures.

As shown in fig. 13A, the metal member 7 made of a metal such as copper, iron, or an alloy containing these as a main component is embedded in the base member 18 by insert molding. The metal member 7 includes terminals 7A, 7B, and 7C, and the terminals 7A, 7B, and 7C are partially exposed on the upper surface (surface on the Z1 side) of the base member 18. Further, the terminals 7A, 7B, and 7C electrically insulated from each other are electrically connected to a substrate (not shown) on which an imaging element or the like is mounted. The terminal 7A is electrically connected to the lower plate spring 26A, and the terminal 7B is electrically connected to the lower plate spring 26B. The lower plate spring 26A is electrically connected to one end of the coil 3, and the lower plate spring 26B is electrically connected to the other end of the coil 3. Therefore, the coil 3 can receive the supply of current via the terminal 7A and the lower plate spring 26A or via the terminal 7B and the lower plate spring 26B.

The base member 18 is also embedded with a connecting member 7D formed by insert molding of a metal made of copper, iron, or a material containing an alloy or the like containing these as a main component, as in the terminals 7A, 7B, and 7C. As shown in fig. 2A and 2B, the connecting member 7D is partially exposed at a portion located at the lower end portion of the curved plate portion 4R constituting the four corners of the outer peripheral wall portion 4G of the case 4. The base member 18 is positioned by combining the inner surface of the side plate portion 4A of the housing 4 and the outer peripheral side surface of the base member 18, and then the connecting member 7D and the lower end portions of the curved plate portions 4R positioned at the four corners of the housing 4 are welded and fixed to the housing 4. The housing 4 and the base part 18 may also be fixed at least partially by an adhesive. In addition, the connection member 7D is connected to the terminal 7C. The terminal 7C functions as a terminal for grounding.

Next, the positional relationship between the adhesive foreign substance capturing member 50 provided on the lens holding member 2 and other components will be described with reference to fig. 14 to 17. Fig. 14 is a plan view showing a positional relationship between the lens holding member 2 and the foreign substance capturing member 50. Fig. 15 is a plan view showing a positional relationship between the upper leaf spring 16 and the foreign substance catching member 50. Fig. 16 is a plan view showing a positional relationship between the base member 18 and the foreign substance trap member 50. Fig. 17 is a plan view showing a positional relationship between the housing 4 and the foreign substance capturing member 50.

As shown in fig. 17, the foreign substance capturing member 50 includes first to fourth foreign substance capturing members 50-1 to 50-4 arranged to correspond to (face) the first to fourth corners 4C1 to 4C4 of the housing 4, respectively. The first foreign matter capturing member 50-1 is provided in the first groove 50R1 (see fig. 5A), and the second foreign matter capturing member 50-2 is provided in the second groove 50R2 (see fig. 5A). The same applies to the third foreign object capturing element 50-3 and the fourth foreign object capturing element 50-4.

The first to fourth foreign object capture members 50-1 to 50-4 are each configured to extend in an arc shape along a virtual circle CL centered on the optical axis JD as shown in fig. 14. However, the optical axis JD may have another shape intersecting an imaginary line L1 connecting the corner 4C (not shown in fig. 14). Examples of the other shapes include a straight line shape, an arc shape or a V shape protruding inward in the radial direction, a V shape protruding outward in the radial direction, a wavy shape, and a zigzag shape. The same applies to the first to fourth grooves 50R1 to 50R 4.

In the present embodiment, the first to fourth foreign object capture members 50-1 to 50-4 are arranged to be secondarily symmetrical with respect to the optical axis JD as shown in fig. 14. The structure is excellent in weight balance. However, it may be configured to be four-fold symmetrical with respect to the optical axis JD, or may be configured to be asymmetrical.

In the present embodiment, the first to fourth foreign object capturing members 50-1 to 50-4 are each configured to form 1 continuous region. However, at least 1 of the first to fourth foreign matter capturing members 50-1 to 50-4 may be formed by a combination of a plurality of independent regions. The same applies to the first to fourth grooves 50R1 to 50R 4.

In the present embodiment, the shape of the groove portion 50R at the wall end FS of the corner wall portion 12C is configured to correspond to the shape of the elastic arm portion 16g of the upper leaf spring 16. Therefore, the shape of the foreign object capture member 50 is also configured to correspond to the shape of the elastic arm portion 16 g.

For example, the third wall end face FS3 includes, as shown in fig. 14: a first section FS3a, a second section FS3b, and a third section FS3c partitioned by the third object catching member 50-3 (third groove portion 50R 3). The first section FS3a, the second section FS3b, and the third section FS3c each have a flat upper surface (a Z1-side face). Further, the respective upper surfaces are located on the same plane. The same applies to the first wall end face FS1, the second wall end face FS2, and the fourth wall end face FS 4.

The first portion FS3a is formed such that the lower surface (surface on the Z2 side) of the third elastic arm portion 16g3 (see fig. 15) does not contact the third object trap member 50-3. Specifically, the third elastic arm portion 16g3 includes an outer connecting portion SG1, an outer extending portion SG2, an outer folded portion SG3, a central extending portion SG4, an inner folded portion SG5, an inner extending portion SG6, and an inner connecting portion SG 7. The outer connection portion SG1 is a portion connected to the outer portion 16e of the upper leaf spring 16, and the inner connection portion SG7 is a portion connected to the inner portion 16i of the upper leaf spring 16. The outer folded portion SG3 is configured to connect the outer extending portion SG2 with the central extending portion SG 4. The inside folded part SG5 is configured to connect the central extension SG4 with the inside extension SG 6. The first section FS3a is disposed so as to be opposed to the central extension SG4 in the Z-axis direction. According to this configuration, even when a strong impact is applied to the lens driving device 101 due to dropping or the like and the lens holding member 2 is moved greatly in the Z1 direction, the center extending portion SG4 comes into contact with only the first portion FS3 a. That is, the center extension SG4 does not contact the third object catching member 50-3 formed on the inner peripheral side (the cylindrical portion 12 side) of the first section FS3 a. Therefore, the central extension SG4 does not adhere to the third object catching member 50-3.

The third object capturing member 50-3 is disposed so as to face the inner extension SG6 in the Z-axis direction. Further, a width W1 (see fig. 14) of a portion of the inner extending portion SG6 facing a portion close to the inner connecting portion SG7 is narrower than a width W2 (see fig. 14) of a portion of the inner extending portion SG6 facing a portion close to the inner folded portion SG 5. This is to prevent the edge portion (see the broken line BL in fig. 15) of the inner bent portion SG5, which has a larger displacement amount (in the Z-axis direction) than the inner coupling portion SG7, from being scraped against the lens holding member 2 to generate fine powder. That is, this is for bringing the edge portion of the inside folded back portion SG5 into contact with the third object trap member 50-3 instead of the surface of the lens holding member 2 when the lens holding member 2 is moved greatly in the Z1 direction. The same applies to the first, second and fourth foreign matter capturing members 50-1, 50-2 and 50-4.

As shown in fig. 16, the foreign substance trap member 50 is configured to cooperate with a bank portion 18D formed in the base member 18. That is, the foreign substance capturing member 50 is disposed so as to prevent foreign substances entering from the cutout portion 4kc formed in the opening 4k of the housing 4 as shown in fig. 17 from reaching the imaging element or the like through the gap between the corner of the housing 4 and the lens holding member 2, the cutout portion of the bank portion 18D, and the opening 18k of the base member 18. For example, the first foreign substance trap member 50-1 is disposed so as to be able to prevent foreign substances that have entered from the first cut-out portion 4kc1 of the opening 4k from reaching the image pickup device or the like through the cut-out portion between the first bank 18D1 and the second bank 18D2 or the cut-out portion between the first bank 18D1 and the eighth bank 18D 8.

Specifically, the first foreign object capture member 50-1 is disposed radially outward of the first cutout portion 4kc1 as shown in fig. 17. The center angle of the arc along the first foreign object capture member 50-1 is larger than the center angle α of the arc along the first cutout 4kc 1. That is, the angle of the region where the first foreign object capture member 50-1 is disposed around the optical axis JD is equal to or greater than the angle (center angle α) of the region where the first cutout portion 4kc1 is formed around the optical axis JD. Therefore, the first foreign substance capture member 50-1 can capture foreign substances that have passed outside the coil 3 and have moved toward the base member 18 side before the foreign substances reach the base member 18 side. The same applies to the second to fourth foreign matter capturing members 50-2 to 50-4. The second slit portions are arranged so as to close the 2 associated cutout portions, that is, so as to extend along an arc between the second bank portion 18D2 and the eighth bank portion 18D 8. However, the central angle along the arc of the first foreign substance catching member 50-1 may be a value smaller than the central angle α.

Further, between the adjacent 2 foreign substance capturing members 50, a brim 12h is formed so as to extend along the side plate portion 4A (the first side plate portion 4A1 and the second side plate portion 4A2) of the case 4 (see fig. 14). Therefore, the eaves 12h can prevent foreign matter entering from the cut-out portion 4kc formed in the opening 4k of the housing 4 from entering the gap between the side plate 4A of the housing 4 and the lens holding member 2. This is to block the path through which foreign matter passes. As a result, the foreign matter can be prevented from reaching the image pickup element or the like through the cutout portion of the bank portion 18D and the opening 18k of the base member 18.

Next, details of the groove portion 50R will be described with reference to fig. 18A to 18D. The following description relates to the second groove portion 50R2, but the same applies to the first groove portion 50R1, the third groove portion 50R3, and the fourth groove portion 50R 4. Fig. 18A to 18C are upper perspective views of a portion V in fig. 14. However, in fig. 18B, the coil 3 is not shown. In fig. 18C, the coil 3 and the second foreign object capturing member 50-2 are not shown. Fig. 18D is an upper perspective view of the second foreign object capture member 50-2 positioned in the second groove portion 50R2 of fig. 18C.

In the present embodiment, the second groove portion 50R2 is formed to correspond to the second cutout portion 4kc2 of the opening 4k formed in the top plate portion 4B of the housing 4. Further, as shown in fig. 18C, the second groove portion 50R2 is formed so as to be continuous with the outer surface of the coil support portion 12j facing the inner peripheral surface of the coil 3. The second groove portion 50R2 is formed between the 2 side wall portions 12S located on both sides of the corner wall portion 12C.

In the present embodiment, the second groove portion 50R2 is formed so as to be continuous with the outer surfaces of the first side wall portion 12S1 and the second side wall portion 12S2 that face the inner peripheral surface of the coil 3 (the winding portion 13). However, the second groove portion 50R2 may be formed so as to be continuous with only the outer surface of either the first side wall portion 12S1 or the second side wall portion 12S 2. The second groove portion 50R2 may be formed so as not to be continuous with the outer surface of either the first side wall portion 12S1 or the second side wall portion 12S 2. That is, the second groove portion 50R2 may be formed such that both ends thereof terminate in the second wall end face FS 2. The second groove portion 50R2 may be formed such that at least one end thereof is continuous with the outer surface of the second corner wall portion 12C 2. The second groove portion 50R2 may have 3 or more ends. Further, the second groove portion 50R2 may be formed so as to be continuous with the outer surface of at least 1 of the second corner wall portion 12C2, the first side wall portion 12S1, and the second side wall portion 12S 2.

A recessed portion RC recessed in a direction away from the inner circumferential surface of the coil 3 (winding portion 13) may be formed on the outer surface of at least 1 of the side wall portions 12S. The recessed portion RC is filled with, for example, an adhesive for bonding the lens holding member 2 and the coil 3. In the present embodiment, as shown in fig. 18C, a first recess RC1 is formed in the outer surface of the first side wall portion 12S1, and a second recess RC2 is formed in the outer surface of the second side wall portion 12S 2. Each of the first recess RC1 and the second recess RC2 has a stepped configuration including an upper side (Z1 side) portion and a lower side (Z2 side) portion. Further, at least a part of the upper portion is formed deeper than the lower portion (in a direction away from the inner circumferential surface of the coil 3). This is to improve the adhesiveness and filling property of the adhesive. However, the recess RC may have other configurations. For example, the depth of the upper portion may be the same as the depth of the lower portion. The stepped structure has an effect of improving the adhesive strength between the lens holding member 2 and the coil 3. This is because the adhesive cured in the recess RC interferes with the vertical (Z-axis) and circumferential movements of the coil 3 due to its shape.

The groove portion 50R is formed to be continuous with the recess portion RC, for example. In this case, the foreign substance capturing member 50 may be formed of an adhesive for adhering the lens holding member 2 and the coil 3. In the present embodiment, as shown in fig. 18C, the second groove portion 50R2 is formed so as to be continuous with each of the first recessed portion RC1 and the second recessed portion RC 2. With this structure, the adhesive having fluidity injected into the second groove portion 50R2 reaches the first recessed portion RC1 and the second recessed portion RC2 through the second groove portion 50R2, respectively. The adhesive is injected into, for example, a wide portion of the second groove portion 50R2 (a wide portion having a width W2 in fig. 14). This is to ensure that the adhesive is not poured into the second groove 50R2 without overflowing from the second groove 50R 2. Then, the adhesive flows into the narrow portion of the second groove portion 50R2 (the narrow portion having the width W1 in fig. 14). Further, the flow of the adhesive is blocked by the inner peripheral surface of the winding portion 13. Then, when the adhesive is cured by heating, irradiation of ultraviolet rays, or the like, the lens holding member 2 and the coil 3 are fixed by the adhesive, and the second foreign substance capturing member 50-2 having adhesiveness is formed. Therefore, in a state where the lens holding member 2 and the coil 3 are fixed by the adhesive, both ends of the second foreign substance capturing member 50-2 are formed to spread along the inner circumferential surface of the wound portion 13 as shown in fig. 18D.

Next, effects achieved by the foreign object capturing member 50 will be described with reference to fig. 19A and 19B. Fig. 19A is a cross-sectional view of the lens holding member 2, the coil 3, the housing 4, and the magnet 5 when the XZ plane including the imaginary line L2 in fig. 17 is viewed from the Y1 side. Fig. 19B is a cross-sectional view of a comparative example in which the foreign substance trap member 50 is not provided in the lens holding member 2. Solid arrows in fig. 19A and 19B indicate the movement path of foreign matter such as dust.

For example, as shown in fig. 19A and 19B, foreign matter entering downward (in the Z2 direction) from the second cutout portion 4kc2 formed in the opening 4k of the housing 4 passes between the cylindrical portion 12 of the lens holding member 2 and the top plate portion 4B of the housing 4. Further, the second wall end face FS2 of the second corner wall portion 12C2 is approached.

When the foreign-matter capturing member 50 is not provided in the lens holding member 2, the foreign matter moves in the X1 direction along the second wall end face FS2 as shown in fig. 19B, and passes between the winding portion 13 and the magnet 5. Further, the optical axis JD can be approached along the lower surface (surface on the Z2 side) of the lens holding member 2, and can pass through the opening 18k of the base member 18 (not shown) to reach the imaging element and the like.

When the foreign matter capturing member 50 is provided in the lens holding member 2, the foreign matter is captured by the second foreign matter capturing member 50-2 as shown in fig. 19A. That is, the foreign matter adheres to the second foreign matter capturing member 50-2 having adhesiveness. Therefore, the second foreign substance capturing member 50-2 can suppress foreign substances from reaching the imaging element or the like.

As described above, the lens driving device 101 according to the embodiment of the present invention includes: a housing having a housing 4 and a base member 18; a lens holding member 2 which is accommodated in the housing and can hold the lens; a coil 3 held outside the lens holding member 2; and a magnet 5 disposed to face the coil 3, and capable of moving the lens holding member 2 supported by the plate spring 6 as a support member in the optical axis direction by a force generated by a current flowing through the coil 3 and a magnetic field generated by the magnet 5. Further, an adhesive foreign matter capturing member 50 is provided on the lens holding member 2. Therefore, it is possible to more reliably prevent foreign matter from reaching the image pickup device or the like through the lens driving device 101, and it is possible to suppress or prevent the occurrence of an image error due to foreign matter adhering to the image pickup device or the like. In the lens driving device 101, the adhesive foreign substance capture member 50 is provided not on the base member 18 but on the lens holding member 2, and therefore, even if the lens body has a larger diameter, the degree of freedom in layout (design) of the base member 18 can be secured.

The housing of the lens driving device 101 typically includes a housing 4 as a cover member, which is rectangular in a plan view viewed along the optical axis direction. Further, the case 4 includes a side plate 4A (a first side plate 4A1 and a second side plate 4A2) and a top plate 4B. The lens holding member 2 has a coil support portion 12j as an outer wall portion facing the inner peripheral surface of the coil 3. The coil support portion 12j includes corner wall portions 12C arranged to correspond to (face) the corners of the case 4, respectively. The corner portion of the case 4 includes at least one of a curved plate portion 4R constituting four corners of the outer peripheral wall portion 4G and a corner portion 4C constituting four corners of the top plate portion 4B. The corner wall 12C has a wall end face FS facing the top plate 4B. Further, the foreign substance catching member 50 is provided on the wall end face FS. With this configuration, the lens drive device 101 can capture foreign matter with the foreign matter capture member 50 provided on the wall end face FS located closer to the top plate 4B than the base member 18. In this configuration, since the foreign substance capturing member 50 is provided on the wall end face FS of the corner wall portion 12C, the degree of freedom in layout (design) of the base member 18 can be secured even when the lens body has a larger diameter.

The foreign substance catching member 50 may be disposed in a groove 50R formed in the wall end FS of the corner wall portion 12C, for example. According to this structure, foreign matter is easily caught by the foreign matter catching member 50. Also, the foreign matter is difficult to be released from the foreign matter capturing member 50. This is because, if foreign matter enters the inside of the groove portion 50R, it is difficult to come out from the groove portion 50R. Further, even when the foreign substance capturing member 50 is a member obtained by curing a flowable adhesive or the like, the groove portion 50R can improve workability in installation (application) of the foreign substance capturing member 50. In order to prevent or suppress the adhesive (foreign substance capturing member 50) from adhering to a portion where the adhesive is not desired to be provided (applied).

The cutout 4kc may be formed in the opening 4k formed in the top plate 4B of the housing 4 so as to expand toward each corner of the housing 4. In this case, the groove portion 50R may be formed to correspond to the cutout portion 4 kc. With this configuration, the foreign matter catching member 50 disposed in the groove portion 50R can more reliably catch the foreign matter entering through the cutout portion 4 kc. Further, foreign matter can be suppressed or prevented from reaching the image pickup element or the like.

The groove 50R may be formed so as to be continuous with the outer surface of the coil support portion 12j, which is an outer wall portion facing the inner peripheral surface of the coil 3. Specifically, as shown in fig. 18C, the right end (end on the X1 side) of the second groove portion 50R2 may be formed so as to be continuous with the outer surface of the first side wall portion 12S1 of the coil support portion 12j and to face the inner peripheral surface of the winding portion 13 of the coil 3. Further, as shown in fig. 18C, the left end (end on the Y2 side) of the second groove portion 50R2 may be formed so as to be continuous with the outer surface of the second side wall portion 12S2 of the coil support portion 12j and to face the inner peripheral surface of the winding portion 13 of the coil 3. The groove portion 50R may be formed such that only one of both ends thereof is continuous with the outer surface of the side wall portion 12S of the coil support portion 12 j. That is, the groove portion 50R may be formed so as to be continuous with at least 1 outer surface of the side wall portion 12S facing the inner peripheral surface of the coil 3. According to this configuration, even when the foreign substance capturing member 50 is a member obtained by curing a flowable adhesive or the like, the winding portion 13 of the coil 3 can block the flow of the adhesive injected into the groove portion 50R.

The coil support portion 12j as the outer wall portion may include a side wall portion 12S disposed so as to face the side plate portion 4A (the first side plate portion 4A1 and the second side plate portion 4A2) of the case 4 with the coil 3 interposed therebetween. In this case, the groove portion 50R may be formed between 2 side wall portions 12S located on both sides of the corner wall portion 12C. Specifically, as shown in fig. 18C, the second groove portion 50R2 may be formed between the first side wall portion 12S1 and the second side wall portion 12S2 located on both sides of the second corner wall portion 12C 2. In addition, the second groove portion 50R2 may not be continuous with the side wall portion 12S. According to this configuration, the groove portion 50R formed in the wall end face FS of the corner wall portion 12C so as to extend over a wide range between the first side wall portion 12S1 and the second side wall portion 12S2 can more reliably capture foreign matter that has intruded into the housing.

As shown in fig. 18C, a concave portion RC that is recessed in a direction away from the inner peripheral surface of the coil 3 may be formed on at least 1 outer surface of the side wall portion 12S. This is for receiving an adhesive for bonding the lens holding member 2 and the coil 3. In this case, the groove portion 50R may be formed to be continuous with the recess portion RC. Specifically, as shown in fig. 18C, a first recess RC1 may be formed in the outer surface of the first side wall portion 12S1, and a second recess RC2 may be formed in the outer surface of the second side wall portion 12S 2. Further, the second groove portion 50R2 may be formed such that its right end is connected to the first recess RC1 and its left end is connected to the second recess RC 2. According to this structure, even when the amount of the uncured foreign substance capture member 50 is large, the recess portion RC can receive the uncured foreign substance capture member 50.

The foreign substance catching member 50 may be a member obtained by curing the adhesive as described above. Further, the coil 3 may be fixed to the coil support portion 12j as the outer wall portion by the adhesive. That is, the adhesive for forming the foreign substance catching member 50 and the adhesive for fixing the coil 3 to the lens holding member 2 may be the same adhesive. In this case, the worker can form the foreign substance capturing member 50 and fix the coil 3 to the lens holding member 2 only by injecting the adhesive into the groove portion 50R. Therefore, the productivity of the lens driving device 101 is improved.

The lens holding member 2 may have: a flange portion 52 as a first projecting portion formed so as to project outward; and a brim portion 12h as a second protruding portion formed so as to protrude outward toward the side plate portion 4A of the case 4. In this case, the brim portion 12h may be formed to face the flange portion 52 in the optical axis direction. The coil 3 may be disposed between the flange portion 52 and the brim portion 12h in the optical axis direction. In this structure, for example, as shown in fig. 5A, an eave portion 12h is present between the adjacent first and second corner wall portions 12C1 and 12C 2. Therefore, the foreign matter does not pass between the brim portion 12h and the top plate portion 4B of the case 4, but passes between the corner wall portion 12C and the top plate portion 4B. This is because the gap is large. As a result, foreign matter is easily caught by the foreign matter catching member 50 formed on the wall end face FS of the corner wall portion 12C.

The wall end face FS of the corner wall portion 12C may be a flat face perpendicular to the optical axis JD. In this case, the end surface 3T of the coil 3 disposed so as to face the top plate 4B of the case 4 and the wall end surface FS may be located on the same plane. With this configuration, the jig used when winding the coil 3 around the lens holding member 2 can be easily attached to the wall end face FS. Further, the foreign substance catching member 50 can be easily installed on the wall end face FS.

A plurality of banks 18D may be provided at the edge of the opening 18k formed in the base member 18. Specifically, the bank portion 18D may be provided so as to complement an opening portion not surrounded by the foreign material capturing member 50 at an edge portion of the opening 18k of the base member 18, as shown in fig. 16, for example. More specifically, the second levee portion 18D2 may be provided to complement an open portion between the first and second foreign material capturing members 50-1 and 50-2. Also, the fourth embankment portion 18D4 may be provided to complement an open portion between the second foreign material capturing member 50-2 and the third foreign material capturing member 50-3. The same applies to the sixth levee portion 18D6 and the eighth levee portion 18D 8.

The preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments. The above-described embodiments can be applied to various modifications and substitutions without departing from the scope of the present invention. Further, the respective features described with reference to the above embodiments may be combined as appropriate as long as there is no technical contradiction.

For example, in the above embodiment, the flange portion 52 is provided with 2 cutout portions 52k through which the extending portion 33 of the coil 3 is inserted, but 3 or more cutout portions may be provided as long as the winding portion 13 of the coil 3 can be held.

In the above embodiment, the lower plate spring 26A is electrically connected to the extending portion 33A, and the lower plate spring 26B is electrically connected to the extending portion 33B, but the present invention is not limited thereto. For example, in the lens driving device having the camera shake correction function, the upper plate spring may be divided into 2 pieces to form a pair, and the pair may be electrically connected to the extension portion 33A and the extension portion 33B, respectively. In this case, a flange portion having a cutout may be provided on the upper end side (Z1 side) of the lens holding member 2.

In the above embodiment, the foreign object capture member 50 is disposed so as to face the first corner 4C1 to the fourth corner 4C4, respectively, but may be disposed so as to face 1, 2, or 3 of the 4 corners 4C.

The present application claims priority to japanese patent application No. 2017-251987, which was filed on a 12-27-12-2017 basis, and the entire contents of the japanese patent application are incorporated herein by reference.

Description of the reference numerals

2 · lens holding member; 2t · projecting part; 3. coil; 3T · end face; 4. shell; 4A. side plate portion; 4a1 · first side panel portion; 4a2 · second side panel portion; 4B · ceiling portion; 4C · corner; 4G · outer peripheral wall portion; 4k · open mouth; 4 kc. cut-away; 4R & curved panel portion; 4s · receiving section; 5. magnet; 6. leaf spring; 7. metal parts; 7A, 7B, 7℃ terminal; 7D · connecting member; 12. cylindrical portion; 12C · corner wall portion; 12d · a pedestal portion; 12dh · divot; 12 h. eave; 12j · coil support; 12S · sidewall portion; 13. coil; 16. upper leaf spring; 16b · angle part; 16e · outer portion; 16 g. elastic arm portion; 16i · inner part; 16r · stack portion; 18. base part; 18D · embankment section; 18k · open; 18t · projecting portion; 26A, 26B. lower leaf spring; 26c · inner junction portion; 26d · outer junction portion; 26e · outer portion; 26 g. resilient arm portion; 26h · web portion; 26i · inner part; 26k cut; 26p · first junction; 26q · second junction; 26t · through part; 26x · end face; 33. 33A, 33B. an extension; 33 c.a.connection; 33k · plug-through; 33m · winding; 50. a foreign matter capturing member; 50R · trough; 52. flange portion; 52 k. cutting away the notch; 72. 72A, 72B. holding part; 82. projecting levee portion; 82s · housing part; 82u · inner sidewall portion; 82v · outer sidewall portion; 82w · side wall portion; 82z · open part; 101. lens driving device; CA · conductive adhesive; FS wall end face; JD. optical axis; MK. a drive mechanism; RC · recess; RG. stationary side components.