JP2018004716A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device capable of ensuring that vibrations in an optical axis direction converge in a short time even when strong impact is applied by a fall or the like.SOLUTION: A lens drive device 101 comprises: a cylindrical lens holding member 2 capable of holding a lens body; an energizing member 3 supporting the lens holding member 2 movably in an optical axis direction; a fixed side member R4 for fixing a part of the energizing member 3; and a drive mechanism M5 for moving the lens holding member 2 in the optical axis direction. The energizing member 3 has an upper side plate spring 3A fixed to an upper part of the lens holding member 2. The upper side plate spring 3A has: a first part 13 fixed to the lens holding member 2; a second part 23 fixed to the fixed side member R4; an elastic arm part 53a provided between the first part 13 and the second part 23; and an extension 63 extended from the first part 13. A damper material GE is provided that extends over between the extension 63 and the fixed side member R4.SELECTED DRAWING: Figure 10

Description

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

  In recent years, it has become common for camera devices to be mounted on portable devices typified by mobile phones. In addition to the demand for downsizing, the lens driving device that is the main part of the camera mechanism mounted on this small portable device has a demand for driving the lens body (lens barrel on which the lens is mounted) with high accuracy. It has increased. As a lens driving device that satisfies these two requirements, a lens driving device provided with a magnetic circuit for driving a lens holder (lens holding member) for holding a lens body is well known.

  As such a lens driving device, Patent Document 1 (conventional example) proposes a lens driving device 901 as shown in FIG. FIG. 13 is a diagram for explaining a conventional lens driving device 901. FIG. 13 (a) is an exploded perspective view of the lens driving device 901, and FIG. 13 (b) is shown in FIG. 13 (a). It is a top view of the leaf | plate spring 905 shown.

  A lens driving device 901 shown in FIG. 13A includes a movable body (lens holder 907 and sleeve 908) that holds a lens and is movable in the optical axis direction, and a fixed body that holds the movable body so as to be movable in the optical axis direction. (Cover member 910, base member 911, spacer 912), a driving mechanism (driving coil 914 and driving magnet 915) for driving the movable body in the optical axis direction, and a spring member connecting the movable body and the fixed body. And a plate spring 905 and a plate spring 906.

  In the conventional lens driving device 901, as shown in FIG. 13B, the upper leaf spring 905 is fixed to the movable side fixing portion 905a fixed to the upper end side of the sleeve 908 and the spacer 912. It is configured to include four fixed side fixing portions 905b and four arm portions 905c that connect the movable side fixing portion 905a and the fixed side fixing portion 905b. Further, the lens driving device 901 is further provided with a cushioning material 917 that is a viscoelastic composition having viscoelasticity at a location straddling the movable side fixing portion 905a and the arm portion 905c. Accordingly, the lens driving device 901 converges the vibration in the optical axis direction of the lens held by the movable body in a short time because the buffer material 917 absorbs vibration in the optical axis direction of the movable body with respect to the fixed body. The so-called damper effect can be achieved.

JP 2012-32607 A

  However, since the cushioning material 917 is provided so as to be applied to the elastically deformable arm portion 905c located between the movable side fixed portion 905a and the fixed side fixed portion 905b, which are spring members, a large impact such as dropping is applied. When added, the arm portion 905c is greatly deformed (behaves undesirably large), and there is a problem that the cushioning material 917 may come off from the spring member or break.

  SUMMARY OF THE INVENTION The present invention solves the above-described problems, and an object thereof is to provide a lens driving device that can ensure that vibration in the optical axis direction converges in a short time even when a strong impact is applied due to dropping or the like. And

  In order to solve this problem, a lens driving device of the present invention includes a cylindrical lens holding member that can hold a lens body, a biasing member that supports the lens holding member so as to be movable in the optical axis direction, In the lens driving device comprising: a fixed side member that fixes a part of the urging member; and a drive mechanism that moves the lens holding member along the optical axis direction, the urging member includes the lens holding member. An upper leaf spring fixed to the upper portion and a lower leaf spring fixed to the lower portion, the first leaf spring fixed to the lens holding member, and an outer periphery than the first portion A second portion positioned on the side and fixed to the fixed-side member, and an elastic arm portion provided between the first portion and the second portion. An extending portion extending from the first portion is formed, and the extending portion and the fixed portion are formed. It is characterized by a damper member which extends over between the side members are provided.

  According to this, in the lens driving device of the present invention, the damper material connects between the portion extended from the first portion fixed to the lens holding member and the fixed side member to which the second portion is fixed. Become. For this reason, even if a strong impact is applied due to dropping or the like, and the elastic arm part is undesirably greatly deformed, the extension part and the damper material are not affected by the deformation of the elastic arm part. It becomes difficult to come off or break from the upper leaf spring) or the fixed member. As a result, even when a strong impact is applied by dropping or the like, the vibration in the optical axis direction (that is, the time until the lens holding member settles in a predetermined position) converges in a short time by the damper material. A damper effect can be secured.

  In the lens driving device of the present invention, the upper leaf spring is provided with a plurality of the first portions, and the extending portions extending from the adjacent first portions are connected to each other. The damper material is provided in an intermediate portion of the connecting portion.

  According to this, since each extended part extended from adjacent 1st parts is mutually connected and forms the connection part, this extension part (connection part) is given a certain amount of rigidity. Even if a strong impact such as dropping is applied, the extended portion is prevented from moving undesirably large. Further, since the damper material is provided in the intermediate portion of the connecting portion (extension portion), the extension portion and the fixed side member are the damper material at a position farther from the first portion fixed to the lens holding member. When the lens holding member is vibrated, the extended portion moves more independently with good balance. For this reason, it can be made difficult for a damper material to remove | deviate from an upper side leaf | plate spring, or to fracture | rupture.

  In the lens driving device according to the present invention, the fixed side member includes a frame-like member to which the second portion is fixed, and the frame-like member extends along an outer peripheral side of the extending portion. A first extending portion is provided, and the first extending portion is provided with a recessed portion opened on the extending portion side, and a part of the extending portion is located in the recessed portion. A protruding piece protruding so as to be provided is provided, and the damper material is held in the recess so as to embed at least a part of the protruding piece.

  According to this, although it is a simple structure, the upper leaf spring (extension portion) fixed to the lens holding member and the frame-like member (first extension portion) that is the fixed side member can be easily made of the damper material. Can be connected. Moreover, since the protruding piece enters the recess and the damper material is reliably held in the recess, the lens holding member and the fixed member can be reliably connected. For this reason, even if a strong impact such as dropping is applied, the damper material is unlikely to be detached from the recess, and the damper material is unlikely to come off or break from the upper leaf spring or the frame-like member (fixed side member).

  In the lens driving device of the present invention, a plurality of the recesses are provided in the first extension part, and a plurality of the projecting pieces are provided in the extension part corresponding to the recesses. A material is provided in each of the recesses.

  According to this, the damper effect can be enhanced, and even if one damper material is removed, the damper effect can be maintained with the other portion of the damper material. Thus, even when vibration is generated in the lens holding member, it is possible to reliably ensure a damper effect that suppresses the vibration by the damper material.

  In the lens driving device of the present invention, the frame-shaped member has a substantially rectangular shape, and the first extending portions are provided along a pair of sides facing each other. A second extending portion is provided along another set of sides intersecting with the sides of the set, and the recess is provided in an intermediate portion of the first extending portion. The first portion is located opposite to the intermediate portion of the extending portion.

  According to this, the damper member that connects the fixed-side member (frame-like member) and the upper leaf spring is provided at a position facing the optical axis and the first portion that fixes the lens holding member and the upper leaf spring. Are provided at positions facing each other across the optical axis. For this reason, the upper leaf spring is connected at four positions, and the vibration of the lens holding member can be suppressed with a good balance. Furthermore, the extended part of the upper leaf spring can be lengthened, and the extended part can be moved more independently of the lens holding member.

  In the lens driving device of the present invention, the damper material is a gel-like resin material.

  According to this, the damper effect which suppresses the vibration of a lens holding member can be exhibited, while allowing the extension part of an upper leaf | plate spring to move within a damper material. Moreover, a damper material can be easily straddled between the extended portion and the fixed side member.

  In the lens driving device of the present invention, the damper material connects between the portion extended from the first portion fixed to the lens holding member and the fixed side member to which the second portion is fixed. For this reason, even if a strong impact is applied due to dropping or the like, and the elastic arm part is undesirably greatly deformed, the extension part and the damper material are not affected by the deformation of the elastic arm part. It becomes difficult to come off or break from the upper leaf spring) or the fixed member. As a result, even when a strong impact is applied by dropping or the like, the vibration in the optical axis direction (that is, the time until the lens holding member settles in a predetermined position) converges in a short time by the damper material. A damper effect can be secured.

It is a disassembled perspective view explaining the lens drive device of 1st Embodiment of this invention. It is a perspective view explaining the lens drive device of a 1st embodiment of the present invention. FIGS. 3A and 3B are diagrams illustrating the lens driving device according to the first embodiment of the present invention, in which FIG. 3A is a top view when FIG. 2 is viewed from the Z1 side, and FIG. It is the front view seen from the side. 4A and 4B are diagrams illustrating the lens driving device according to the first embodiment of the present invention, in which FIG. 4A is a perspective view in which the casing illustrated in FIG. 2 is omitted, and FIG. It is the perspective view which further abbreviate | omitted the frame-shaped member and position detection means which are shown to a). 5A and 5B are diagrams illustrating the lens driving device according to the first embodiment of the present invention, in which FIG. 5A is a bottom view when FIG. 2 is viewed from the Z2 side, and FIG. It is the bottom view which abbreviate | omitted the base member shown to (). It is a figure explaining the lens drive device of 1st Embodiment of this invention, Comprising: It is sectional drawing in the VI-VI line shown to Fig.3 (a). FIGS. 7A and 7B are diagrams illustrating a lens holding member of the lens driving device according to the first embodiment of the present invention, in which FIG. 7A is a perspective view of the lens holding member, and FIG. It is the perspective view by which the coil was wound around the lens holding member shown to a). FIG. 8A is a diagram illustrating an urging member of the lens driving device according to the first embodiment of the present invention, and FIG. 8A is a top view of the upper leaf spring shown in FIG. FIG. 8B is a top view of the lower leaf spring shown in FIG. 1 viewed from the Z1 side. FIGS. 9A and 9B are diagrams illustrating a frame-shaped member of the lens driving device according to the first embodiment of the present invention, in which FIG. 9A is a perspective view of the frame-shaped member, and FIG. It is a perspective view which shows the state by which the upper leaf | plate spring was fixed to. It is a figure explaining the frame-shaped member of the lens drive device concerning a 1st embodiment of the present invention, and Drawing 10 (a) is a top view which looked at Drawing 9 (b) from the Z1 side, FIG. 4B is a top view of FIG. 4A viewed from the Z1 side. It is a figure explaining the base member of the lens drive device concerning a 1st embodiment of the present invention, and Drawing 11 (a) is a perspective view of a base member, and Drawing 11 (b) is Drawing 11 (a). It is a perspective view which shows the state by which the lower leaf | plate spring was mounted in the base member. FIGS. 12A and 12B are views for explaining position detection means of the lens driving device according to the first embodiment of the present invention, FIG. 12A is a perspective view of the position detection means, and FIG. It is a perspective view of the position detection means seen from the Y1 side shown to a). FIGS. 13A and 13B are diagrams illustrating a conventional lens driving device, in which FIG. 13A is an exploded perspective view of the lens driving device, and FIG. 13B is a plan view of a leaf spring shown in FIG. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is an exploded perspective view illustrating the lens driving device 101 according to the first embodiment of the present invention. FIG. 2 is a perspective view illustrating the lens driving device 101 according to the first embodiment of the present invention. 3A is a top view of the lens driving device 101 as viewed from the Z1 side in FIG. 2, and FIG. 3B is a front view of the lens driving device 101 as viewed from the Y2 side in FIG. 4A is a perspective view in which the casing 41 that is the fixed side member R4 of the lens driving device 101 shown in FIG. 2 is omitted, and FIG. 4B is a frame-like member shown in FIG. 44 is a perspective view further omitting the position detection means K7 and the position detection means K7. 5A is a bottom view of the lens driving device 101 as viewed from the Z2 side in FIG. 2, and FIG. 5B is a bottom view in which the base member 8 shown in FIG. 5A is omitted. FIG. 6 is a cross-sectional view taken along the line VI-VI shown in FIG. 3A and shows an initial state in which no current flows through the coil 35. In FIG. 6, the base member 8 is arranged in the vertical direction in which gravity acts, and this vertical direction is set as the Z2 direction.

  The lens driving device 101 according to the first embodiment of the present invention has a rectangular parallelepiped shape as shown in FIGS. 2, 3 and 5A, and as shown in FIGS. (Not shown) including a cylindrical lens holding member 2, a biasing member 3 that supports the lens holding member 2 so as to be movable in the optical axis direction KD, and a housing 41 that houses the lens holding member 2. The fixed-side member R4 and a drive mechanism M5 that moves the lens holding member 2 along the optical axis direction KD (Z direction shown in FIG. 2) are configured. In addition, in the first embodiment of the present invention, as shown in FIG. 4A, the lens driving device 101 is a fixed-side member disposed above the lens holding member 2 (Z1 direction shown in FIG. 4). A frame-shaped member 44 that is R4, position detection means K7 that detects the position of the lens holding member 2 in the optical axis direction KD, and a lower portion of the lens holding member 2 (shown in FIG. 4) as shown in FIG. And a base member 8 which is a fixed side member R4 disposed in the Z2 direction).

  Further, as shown in FIG. 4B, the urging member 3 includes an upper leaf spring 3A fixed to the upper portion of the lens holding member 2, and a lower portion of the lens holding member 2 as shown in FIG. The lower plate spring 3 </ b> C and the lower plate spring 3 </ b> E that are fixed to each other are configured to support the lens holding member 2.

  4 and 6, the drive mechanism M5 includes an annular coil 35 wound around the lens holding member 2 and two drive magnets 55 arranged to face the coil 35. ing.

  Further, as shown in FIG. 4A, the position detection means K7 includes a detection magnet 75 fixed to the lens holding member 2, a magnetic detection member 77 provided opposite to the detection magnet 75, and a magnetism. And a wiring board 79 on which a detection member 77 is mounted.

  The lens driving device 101 holds a lens body (not shown) on the lens holding member 2 and is mounted on a substrate (not shown) on which an imaging element is mounted. In order to adjust the focal length by driving the lens held by the lens body in the optical axis direction KD (Z direction shown in FIG. 2), the lens driving device 101 is supplied with current from the power source to the coil 35. The lens holding member 2 is moved along the optical axis direction KD with respect to the image pickup device by the generated electromagnetic force.

  Next, each component will be described in detail. First, the lens holding member 2 of the lens driving device 101 will be described. 7A and 7B are diagrams for explaining the lens holding member 2. FIG. 7A is a perspective view of the lens holding member 2, and FIG. 7B is a lens holding member shown in FIG. 7A. 2 is a perspective view in which a coil 35 is wound around 2. FIG.

  The lens holding member 2 of the lens driving device 101 uses a liquid crystal polymer (LCP, Liquid Crystal Polymer) which is one of synthetic resins, and is formed in a cylindrical shape as shown in FIG. A cylindrical portion 12 having a peripheral surface and a rectangular outer peripheral surface (circular shape on the upper end side), and a flange portion 22 protruding radially outward from an outer peripheral surface on the upper end side (Z1 side shown in FIG. 4) of the cylindrical portion 12; The flange portion 32 is provided opposite to the flange portion 22 and protrudes radially outward from the outer peripheral surface of the lower end (Z2 side shown in FIG. 4) of the cylindrical portion 12. And the lens holding member 2 is arrange | positioned above the base member 8 (Z1 direction shown in FIG. 4), as shown in FIG.

  As shown in FIG. 7, the cylindrical portion 12 of the lens holding member 2 has a female screw portion 12n formed on its inner peripheral surface, and a lens body (not shown) is mounted and held on the female screw portion 12n. Further, as shown in FIG. 7A, the outer peripheral surface of the cylindrical portion 12 is formed in an octagonal shape between the flange portion 32 and the flange portion 22, as shown in FIG. 7B. Further, the coil 35 is wound in an octagon shape supported by the outer peripheral surface.

  Moreover, as shown in FIG. 7, the base part 12d is formed in two places facing the outer peripheral surface of the cylinder part 12 above the collar part 22. As shown in FIG. When the lens driving device 101 is assembled, as shown in FIG. 4 (b), two pedestal portions 12d (lens holding members 2) that face each other (in the X direction shown in FIG. 4 (b)). The upper leaf spring 3A (first portion 13 described later) of the urging member 3 is fixed with an adhesive.

Further, on the bottom surface of the lens holding member 2 on the collar portion 32 side, as shown in FIG. 5 (b), a columnar shape protruding downward (in FIG. 5 (b), in the Z2 direction shown in FIG. 7 in front of the paper surface). The protruding portions 12t are provided at four places (two protruding portions 12t ₁ and two protruding portions 12t ₂ ). Then, when the lens driving device 101 is assembled, as shown in FIG. 5 (b), together with the two convex portions 12t ₁ is engaged with the lower leaf spring 3C (third portion 33 to be described later), two convex portions 12t ₂ engages the lower leaf spring 3E (third portion 33 to be described later).

  Further, as shown in FIG. 5B, two prism-like binding portions 12 k protruding downward are provided on the bottom surface of the lens holding member 2. Each of the coil end portions of the coil 35 is wound around the binding portion 12k and soldered to the two lower leaf springs 3C and 3E. In FIG. 5B, the solder HD in which two coil ends, the lower leaf spring 3C and the lower leaf spring 3E are soldered is schematically shown by cross hatching surrounded by a broken line.

  Next, the urging member 3 of the lens driving device 101 will be described. FIG. 8 is a view for explaining the urging member 3. FIG. 8 (a) is a top view of the upper leaf spring 3A shown in FIG. 1 as viewed from the Z1 side, and FIG. 3 is a top view of the lower leaf spring 3C and the lower leaf spring 3E shown in FIG.

  The urging member 3 of the lens driving device 101 is made of a metal plate made of a copper alloy as a main material, and as shown in FIG. 4 (b), from the inner peripheral surface of the cylindrical portion 12 of the lens holding member 2. Also has an upper leaf spring 3A disposed between the lens holding member 2 and the frame-shaped member 44, and two members disposed between the lens holding member 2 and the base member 8. The lower leaf spring 3C and the lower leaf spring 3E are configured. Then, a part of each of the biasing members 3 (upper leaf spring 3A, lower leaf spring 3C, lower leaf spring 3E) is fixed to the lens holding member 2, and the lens holding member 2 is in the optical axis direction KD (FIG. 2). The urging member 3 supports the lens holding member 2 in the air so as to be movable in the Z direction shown in the drawing. Since the lower leaf spring 3C and the lower leaf spring 3E (two leaf springs) are electrically connected to the coil 35 by solder HD as shown in FIG. It also has a function as

  First, as shown in FIG. 8A, the upper leaf spring 3A of the urging member 3 has a substantially rectangular outer shape and is fixed to the lens holding member 2 (first embodiment of the present invention). Two portions) in the form), four second portions 23 positioned on the outer peripheral side of the first portion 13 and fixed to the stationary member R4 (specifically, the frame-shaped member 44); Four elastic arm portions 53a provided between the first portion 13 and the second portion 23, an extending portion 63 extended from the first portion 13, and the four second portions 23 are connected to each other. And a crosspiece 73.

  Moreover, in 1st Embodiment of this invention, as shown to Fig.8 (a), each extension part 63 extended from the adjacent 1st part 13 (1st part 13 mutually opposed) is connected. Thus, one connecting portion is formed, and the first portion 13 and the extending portion 63 form an annular shape on the inner side. As a result, the extending portion 63 that is the connecting portion can have a certain degree of rigidity, and even if a strong impact such as dropping is applied, the extending portion 63 is prevented from moving undesirably.

  Further, in the first embodiment of the present invention, the extending portion 63 of the upper leaf spring 3A is provided with a plurality of protruding pieces 63t protruding outward (total of four pieces in two at two locations each). .

  When the upper leaf spring 3A is incorporated in the lens driving device 101, as shown in FIG. 4B, the first portion 13 is placed on the pedestal portion 12d of the lens holding member 2, and the first portion By fixing 13 and the pedestal portion 12d with an adhesive, one side of the upper leaf spring 3A is fixed to the lens holding member 2.

  On the other hand, as shown in FIG. 6, two portions of the second portion 23 are in contact with the upper surface of the driving magnet 55 (see FIG. 4B), and together with the frame-shaped member 44, It is clamped by the casing 41. The driving magnet 55 is fixed to the casing 41 with an adhesive. Further, although not shown, the other two second portions 23 are fixed to the lower surface of the frame-shaped member 44 with an adhesive, so that the other side of the upper leaf spring 3A is fixed.

  Thus, as shown in FIG. 8A, the upper leaf spring 3A is configured in a substantially line-symmetric shape, and two equal positions of the first portion 13 with respect to the lens holding member 2. (Refer to FIG. 4) and fixed at four equal positions of the second portion 23 with respect to the fixed member R4 (the casing 41, the frame-shaped member 44, and the driving magnet 55). (See FIG. 6). Thereby, the lens holding member 2 can be supported in the air with good balance. In the first embodiment of the present invention, since the driving magnet 55 sandwiches the two second portions 23 between the frame-shaped member 44, the driving magnet 55 has a part of the fixed side member R4. It will be composed. On the other hand, a configuration in which all the second portions 23 are directly fixed to the frame-shaped member 44 with an adhesive may be employed.

  Next, as shown in FIG. 8B, the lower leaf spring 3C and the lower leaf spring 3E of the urging member 3 have a substantially rectangular outer shape and a semicircular inner shape. Four third portions 33 fixed to the holding member 2, four fourth portions 43 fixed to the base member 8 (see FIG. 11B described later), third portions 33 and fourth Two elastic arm portions 53c and 53e positioned between the portion 43, a first linkage portion 83 that connects two third portions 33, and a second link portion that connects two fourth portions 43, respectively. 2 chain parts 93.

  Further, as shown in FIG. 8B, circular through holes 33k are formed in the third portions 33 of the lower leaf spring 3C and the lower leaf spring 3E, respectively. In addition, circular through holes 43m are formed in the fourth portions 43 of the lower leaf spring 3C and the lower leaf spring 3E, respectively, and rectangular through holes 43s and through holes 43t are formed in one place. .

When the lower leaf spring 3C and the lower leaf spring 3E are incorporated in the lens driving device 101, as shown in FIG. 5B, the two protruding portions 12t ₁ (12t) of the lens holding member 2 are provided. Are inserted through and fitted into a through hole 33k (see FIG. 8B) of the lower leaf spring 3C, and the two protruding portions 12t ₂ (12t) of the lens holding member 2 are connected to the lower leaf spring 3E. The through-holes 33k (see FIG. 8B) are inserted and fitted. Accordingly, one side of the lower leaf spring 3 </ b> C and the lower leaf spring 3 </ b> E is positioned on the lens holding member 2 and fixed to the lens holding member 2. At this time, the convex portions 12t (12t ₁ , 12t ₂ ) of the lens holding member 2 are heat caulked to more securely fix the lower leaf spring 3C and the lower leaf spring 3E to the lens holding member 2. ing.

  On the other hand, a protruding portion 18t (see FIG. 1) provided on the upper surface of the base member 8 to be described later is inserted into a through hole 43m (see FIG. 8B) of the lower leaf spring 3C and the lower leaf spring 3E. Are mated. Thereby, the other side of the lower leaf spring 3 </ b> C and the lower leaf spring 3 </ b> E is positioned on the base member 8 and is fixed to the base member 8.

  In this way, the lower leaf spring 3C and the lower leaf spring 3E are configured in a substantially line-symmetric shape as shown in FIG. 8B, and the third portion 33 of the lens holding member 2 is formed. While being connected at four equal positions, it is connected to the base member 8 at four equal positions of the fourth portion 43. Thereby, the lens holding member 2 can be supported in the air with good balance. Therefore, the biasing member 3 configured as described above supports the lens holding member 2 so as to be movable in the optical axis direction KD.

  Here, the biasing member 3 (the upper leaf spring 3A, the lower leaf spring 3C, and the lower leaf spring 3E) in the initial state in which the lens driving device 101 is assembled and the coil 35 is not energized will be described.

  The first portion 13 of the upper leaf spring 3A is located on the upper side (Z1 direction side) of the second portion 23 as shown in FIG. 6 in the initial state in which no current flows through the coil 35. . Therefore, a biasing force is applied to the lens holding member 2 by the upper leaf spring 3A in the direction toward the lower leaf spring 3C and the lower leaf spring 3E on the lower side (Z2 direction side). Note that the extending portion 63 extending from the first portion 13 is also located above the second portion 23 of the upper leaf spring 3A in the initial state, similarly to the first portion 13.

  On the other hand, the third portion 33 of the lower leaf spring 3 </ b> C and the lower leaf spring 3 </ b> E is positioned below the fourth portion 43 in the initial state where no current is passed through the coil 35. Therefore, a biasing force is applied to the lens holding member 2 in the direction toward the upper plate spring 3A, which is the upper side, by the lower plate spring 3C and the lower plate spring 3E.

  As a result, the lens holding member 2 is acted on by the upper leaf spring 3A, the lower leaf spring 3C, and the lower leaf spring 3E so as to be pressed against each other. The urging forces of the side leaf springs 3A, the lower leaf springs 3C, and the lower leaf springs 3E are maintained in the initial state shown in FIG.

  Then, the first portion 13 of the upper leaf spring 3A is fixed so that the lens holding member 2 is held by the biasing member 3 (upper leaf spring 3A, lower leaf spring 3C, and lower leaf spring 3E) in this way. The dimension in the optical axis direction KD between the upper end portion of the lens holding member 2 and the lower end portion of the lens holding member 2 to which the third portion 33 of the lower leaf spring 3C and the lower leaf spring 3E is fixed is that of the upper leaf spring 3A. Dimensions in the optical axis direction KD between the lower surface of the frame-like member 44 to which the second portion 23 is fixed and the upper surface of the base member 8 to which the fourth portions 43 of the lower leaf spring 3C and the lower leaf spring 3E are fixed. It is set larger.

  Next, the fixed side member R4 of the lens driving device 101 will be described. 9A and 9B are diagrams for explaining the frame-shaped member 44 that is the fixed side member R4. FIG. 9A is a perspective view of the frame-shaped member 44, and FIG. It is a perspective view which shows the state by which the upper leaf | plate spring 3A was fixed to. FIG. 10A is a top view of FIG. 9B viewed from the Z1 side, and FIG. 10B is a top view of FIG. 4A viewed from the Z1 side. In FIG. 9B and FIG. 10, the damper material GE is schematically shown by cross hatching surrounded by a broken line. 11A and 11B are views for explaining the base member 8, FIG. 11A is a perspective view of the base member 8, and FIG. 11B is a lower side plate on the base member 8 of FIG. 11A. It is a perspective view which shows the state in which the spring 3C and the lower leaf | plate spring 3E were mounted.

  The fixed side member R4 is a member having a function of fixing a part of the urging member 3 that supports the lens holding member 2 so as to move while the lens holding member 2 moves along the optical axis direction KD. That is, in the first embodiment of the present invention, as shown in FIG. 1, the fixed-side member R4 includes a housing 41 that fixes the second plate 23 of the upper leaf spring 3A with the driving magnet 55 therebetween. A frame-like member 44 to which the second portion 23 of the upper leaf spring 3A is fixed with an adhesive, and a base member 8 to which the fourth portion 43 of the lower leaf spring 3C and the lower leaf spring 3E is fixed. Has been. In the first embodiment of the present invention, the other side of the upper leaf spring 3A is fixed by sandwiching the two portions of the second portion 23 of the upper leaf spring 3A between the frame-shaped member 44 and the driving magnet 55. Therefore, the driving magnet 55 can also be referred to as a fixed-side member R4 that fixes a part of the biasing member 3.

  First, the casing 41 of the fixed side member R4 will be described. The casing 41 is manufactured by cutting, drawing, or the like using a metal plate made of a nonmagnetic metal material. The outer shape as shown in FIG. 1 is formed in a box shape, and FIG. Is substantially rectangular (as viewed in plan). The housing 41 includes a cylindrical outer peripheral portion 41A and a flat plate-like upper plate portion 41B provided continuously with the upper end (Z1 side shown in FIG. 1) of the outer peripheral portion 41A. A substantially circular opening 41k is formed in the upper plate portion 41B. As shown in FIG. 2, the housing 41 includes a lens holding member 2, an urging member 3 (upper leaf spring 3A, lower leaf spring 3C, lower leaf spring 3E), a frame-like member 44, and a drive mechanism M5 (coil). 35 and the drive magnet 55) are accommodated and engaged with the base member 8 disposed below (Z2 direction shown in FIG. 2) and integrated with the base member 8. Yes.

  Next, the frame-shaped member 44 of the fixed side member R4 will be described. The frame-shaped member 44 uses a synthetic resin such as polybutylene terephthalate (PBT), and has a rectangular opening 44k at the center and has a substantially rectangular shape as shown in FIG. 9A. It is. The frame-shaped member 44 includes a first extending portion 44A that is a set of sides facing each other, and a second extending portion 44B that is another set of sides that intersect the set of sides in an orthogonal state. And a corner side portion 44C that connects the first extending portion 44A and the second extending portion 44B.

  In addition, the first extending portion 44A of the frame-shaped member 44 is provided with a plurality of concave portions 44r that open toward the inside of the frame (in the first embodiment of the present invention, a total of four concave portions 44r are opposed to each other at two locations). It has been. In the first embodiment of the present invention, the recesses 44r are respectively provided in the intermediate part of the first extension part 44A.

  When the frame-like member 44 is incorporated in the lens driving device 101, it is disposed above the upper leaf spring 3A as shown in FIG. 4A, and diagonally as shown in FIG. The second portion 23 of the upper leaf spring 3 </ b> A is sandwiched between the corner side portions 44 </ b> C of the frame-shaped member 44 and the driving magnet 55. As shown in FIG. 10, the first extending portion 44 </ b> A of the frame-shaped member 44 extends along the outer peripheral side of the extending portion 63 of the upper leaf spring 3 </ b> A, and the second extending of the frame-shaped member 44. The intermediate portion of the portion 44B is positioned to face the first portion 13 of the upper leaf spring 3A.

  Further, as shown in FIG. 10A, the recess 44r of the first extending portion 44A has its opening directed toward the extending portion 63, and the protruding piece provided on the extending portion 63 of the upper leaf spring 3A. The tip part (part) of 63t is positioned in the recess 44r. As described above, in the initial state of the lens driving device 101, the extending portion 63 of the upper leaf spring 3 </ b> A is located above the second portion 23. For this reason, the protruding piece 63t provided in the extending portion 63 can be appropriately disposed in the concave portion 44r (the central portion in the Z direction of the concave portion 44r).

  Then, as shown in FIG. 9B and FIG. 10, the damper material GE, which is a gel-like resin material having viscosity, embeds at least a part (tip portion) of the protruding piece 63t. Since it is held in a plurality of (four) recesses 44r, the damper material GE straddles between the extending portion 63 of the upper leaf spring 3A and the fixed member R4 (specifically, the frame member 44). Will be provided. As a result, unlike the conventional example, the damper material GE is a fixed-side member in an extending portion 63 different from the elastic arm portion 53a provided between the first portion 13 and the second portion 23 of the upper leaf spring 3A. It connects with R4 (frame-like member 44). For this reason, even if a strong impact is applied by dropping or the like, and the elastic arm portion 53a is undesirably greatly deformed, the extension portion 63 and the damper material GE are not affected by the deformation of the elastic arm portion 53a. However, it is difficult for the extended portion 63 (the upper leaf spring 3A) or the fixed-side member R4 to come off or break. The damper material GE is made of an ultraviolet curable gel-like synthetic resin, and for example, a silicone gel (product name: TB3168) manufactured by ThreeBond Co., Ltd. can be used.

  Further, since the lens holding member 2 moving in the optical axis direction KD is not connected to the fixed side member R4, the damper material GE vibrates the lens holding member 2 even when vibration is generated in the lens holding member 2. It is hard to be influenced by. Further, since the extending portion 63 is extended from the first portion 13, it moves integrally with the lens holding member 2, but it is not a portion fixed to the lens holding member 2, and thus moves independently to some extent. be able to. For this reason, since the extension part 63 can move a little following the damper material GE, the damper material GE can be made more difficult to break. As described above, even when a strong impact is applied by dropping or the like, the vibration in the optical axis direction KD (that is, the time until the lens holding member 2 settles in a predetermined position) is short in a short time by the damper material GE. A so-called damper effect that converges can be ensured.

  In addition, since the damper material GE has a viscous gel shape, the extension portion 63 (the protruding piece 63t in the first embodiment of the present invention) of the upper leaf spring 3A is allowed to move within the damper material GE, and the lens. The damper effect which suppresses the vibration of the holding member 2 can be exhibited. Further, it can be easily provided between the extending portion 63 and the fixed member R4.

  Moreover, in 1st Embodiment of this invention, as shown in FIG.9 (b), damper material GE is provided in the 1st extension part 44A so that the protrusion piece 63t provided in the extension part 63 may be embedded. Since the structure is held by the concave portion 44r, the upper plate spring 3A (extension portion 63) fixed to the lens holding member 2 and the frame-shaped member 44 (first member) which is the fixed side member R4 are simple in structure. The extended portion 44A) can be easily connected with the damper material GE. Moreover, since the protruding piece 63t enters the recess 44r and the damper material GE is reliably held in the recess 44r, the lens holding member 2 and the fixed member R4 can be reliably connected. For this reason, even if a strong impact such as dropping is applied, the damper material GE is unlikely to come off from the recess 44r, and the damper material GE may come off from the upper leaf spring 3A or the frame-like member 44 (fixed side member R4) or break. It becomes difficult.

  Moreover, even if the extended portion 63 is greatly deformed so that the protruding piece 63t is removed from the concave portion 44r due to a strong impact, when the impact is subsided, the protruding piece 63t returns to the concave portion 44r again, and the subsequent damping effect is obtained. It will not be damaged. Since the damper material GE is provided in the recess 44r, the damper material GE can be easily disposed and the damper material GE does not easily flow out of the recess 44r. Further, the amount of the damper material GE can be adjusted by adjusting the shape of the accommodation space of the recess 44r.

  Furthermore, in the first embodiment of the present invention, a plurality of the recesses 44r are provided, and the protruding pieces 63t and the damper material GE are provided corresponding to the plurality of the recesses 44r, so that the damper effect is enhanced. In addition, even if one damper material GE comes off, the damper effect can be maintained with the other portion of the damper material GE. Thus, even when vibration is generated in the lens holding member 2, it is possible to reliably ensure a damper effect that suppresses the vibration by the damper material GE.

  Further, as shown in FIG. 10A, a recess 44r is provided in the intermediate portion of the first extending portion 44A of the frame-like member 44, and an intermediate portion of the second extending portion 44B of the frame-like member 44. Since the first portion 13 of the upper leaf spring 3A is located facing the portion, the damper material GE connecting the stationary member R4 (frame-like member 44) and the upper leaf spring 3A is opposed across the optical axis. The first portion 13 that fixes the lens holding member 2 and the upper leaf spring 3 </ b> A is provided at a position facing the optical axis. For this reason, the upper leaf spring 3A is connected at four positions, and the vibration of the lens holding member 2 can be suppressed with a good balance.

  Further, since the extending portions 63 extending from the adjacent first portions 13 are connected to form one connecting portion, the extending portion 63 of the upper leaf spring 3A can be lengthened, and the extending portion 63 can be used as a lens. It can be made to move more independently of the holding member 2.

Next, the base member 8 of the fixed side member R4 will be described. The base member 8 is manufactured by injection molding using the same synthetic resin material as the lens holding member 2 such as liquid crystal polymer (LCP). As shown in FIG. And is formed in an annular shape having a circular opening 8k at the center. Further, as shown in FIG. 11A, four projecting portions 18t (two projecting portions 18t ₁ and two projecting portions 18t ₂ ) projecting upward are formed on the upper surface of the base member 8. It is provided at the four corners. As described above, as shown in FIG. 11 (b), the protruding portion 18t is inserted into the through hole 43m (see FIG. 8 (b)) of the lower leaf spring 3C and the lower leaf spring 3E. Combined. At this time, the caulking portion 18t of the base member 8 is heat caulked to more reliably fix the lower leaf spring 3C and the lower leaf spring 3E to the base member 8.

  Further, as shown in FIG. 11A, the base member 8 includes three terminals T9 (a power supply terminal T9C, a power supply terminal) made of a metal plate made of a material such as copper, iron, or an alloy containing them as a main component. T9E and ground terminal T9G) are insert-molded and embedded. Each of the three electrically insulated terminals T9 is electrically connected to an electrode land on a substrate on which an imaging element (not shown) is mounted, and can supply power from the electrode land on the substrate, and also to the electrode land. It is designed to be grounded. That is, the power supply terminal T9C and the power supply terminal T9E are connected to the power source, and the ground terminal T9G is connected to the ground.

  The power supply terminal T9C is electrically connected to the connection portion T9d shown in FIG. 11A at the through hole 43s of the lower leaf spring 3C shown in FIG. 11B, and the power supply terminal T9E is The portion of the through hole 43t of the lower leaf spring 3E shown in FIG. 11B is electrically connected to the connection portion T9f shown in FIG. Thereby, a current can be passed from the power supply terminal T9C and the power supply terminal T9E to the coil 35 via the lower leaf spring 3C and the lower leaf spring 3E. The lower plate spring 3C and the lower plate spring 3E are connected to the power supply terminal T9C and the power supply terminal T9E, although not shown, are easily connected by soldering or welding.

  Further, although not shown in detail in the base member 8, a connecting member 59 made of a metal plate using a material such as copper, iron, or an alloy containing them as a main component is also the same as the three terminals T9. The part of the connecting member 59 is partially exposed at the four corners of the housing 41 as shown in FIG. Then, after the inner wall of the outer peripheral portion 41A of the housing 41 and the outer peripheral side surface of the base member 8 are combined and positioned, four joints between the connection member 59 of the base member 8 and the four corners of the housing 41 are welded. The housing 41 is fixed to the base member 8. Note that at least a part of the connection member 59 is formed integrally with the ground terminal T9G. Therefore, the casing 41 can be grounded via the connection member 59 and the ground terminal T9G.

  Next, the driving mechanism M5 of the lens driving device 101 will be described. The drive mechanism M5 has a function of moving the lens holding member 2 along the optical axis direction KD (Z direction shown in FIG. 1), and is wound around the lens holding member 2 as shown in FIG. The annular coil 35 is provided, and two drive magnets 55 arranged opposite to the coil 35.

  First, the coil 35 of the drive mechanism M5 is made of a metal wire having an insulating coating (coating) on the outer periphery, and is wound around the outer periphery of the lens holding member 2 as shown in FIG. As shown in FIG. 2, it is formed in a substantially octagonal annular shape. In that case, the coil 35 is arrange | positioned between the collar part 22 and the collar part 32, as shown in FIG.7 (b), and is supported and fixed to a square-shaped outer peripheral surface from the inner side. The coil 35 has a shape in which a metal wire is wound and bundled. However, in FIG. 1, FIG. 4, FIG.

  The coil 35 is electrically conductive at both ends of the wound metal wire, and as described above, each of the coil ends has two lower ends as shown in FIG. The side leaf spring 3C and the lower leaf spring 3E are soldered and electrically connected.

  Next, the driving magnet 55 of the driving mechanism M5 uses, for example, two samarium cobalt magnets, and faces the coil 35 at the opposite corner of the outer peripheral portion 41A of the housing 41 as shown in FIG. It is arranged and fixed in a state. Further, the driving magnet 55 is formed in a trapezoidal columnar shape in plan view as shown in FIG. 1, and is orthogonal to the optical axis direction KD (Z direction) as shown in FIG. The cross-sectional shape in the direction has a constant shape. Thereby, the productivity of the drive magnet 55 is good, and the magnetic flux generated from the drive magnet 55 becomes stable. The driving magnet 55 is magnetized in a linear direction perpendicular to the short side surface and the long side surface. In other words, the drive magnet 55 is magnetized so as to have different magnetic poles on the inner side facing the coil 35 and the outer side (see FIG. 10) opposite to the inner side.

  As described above, since the lens holding member 2 and the coil 35, the casing 41, and the driving magnet 55 are respectively arranged, the lens driving device 101 causes a current to flow from the power source to the coil 35. Due to the electromagnetic force generated, thrust acts on the coil 35 corresponding to the direction in which the current flows, and the lens holding member 2 moves up and down.

  Finally, the position detection unit K7 of the lens driving device 101 will be described. FIG. 12A is a perspective view of the position detection means K7, and FIG. 12B is a perspective view of the position detection means K7 viewed from the Y1 side shown in FIG. 12A.

  As shown in FIG. 12, the position detection means K7 is fixed to the lens holding member 2 (see FIG. 4A), and a detection magnet 75 and a magnetic detection member provided to face the detection magnet 75. 77 and a wiring board 79 on which the magnetic detection member 77 is mounted.

  First, the detection magnet 75 of the position detection means K7 is formed in a rectangular parallelepiped shape using, for example, a samarium cobalt magnet, and is disposed on the flange 32 of the lens holding member 2 as shown in FIG. It is fixed. As a result, the detection magnet 75 moves as the lens holding member 2 moves. The detection magnet 75 is magnetized so as to have different magnetic poles above and below the optical axis direction KD.

  Next, the magnetic detection member 77 of the position detection means K7 uses a Hall element that detects a change in magnetism. As shown in FIG. 12B, four terminal portions (in FIG. 12B, 77a And 77b) are exposed to the outside and formed with a package incorporating a Hall element. Then, it is fixed to the wiring board 79 by soldering to four conductive members 79d of the wiring board 79 described later. The magnetic sensitive direction of the Hall element is the Y direction shown in FIG.

  Next, as shown in FIG. 12B, the wiring board 79 of the position detecting means K7 includes four external terminals 79c formed of a conductive metal member and a conductive pattern integrally formed with the external terminals 79c. And a base member 79f that exposes the external terminal 79c and embeds the conductive member 79d. Then, the four external terminals 79c of the wiring board 79 are electrically connected to the electrode lands of the board on which an imaging element (not shown) is mounted together with the terminal T9 of the base member 8. The wiring board 79 is fixed to the inner surface of the outer peripheral portion 41A of the housing 41 with an adhesive.

  In the position detection means K7 configured as described above, the magnetic flux generated from the detection magnet 75 changes due to the movement of the detection magnet 75 as the lens holding member 2 moves, and the change in the magnetic flux is magnetized. Detection is performed by the detection member 77. Thereby, the position detection means K7 can detect the position corresponding to the change of the magnetic flux, that is, the position of the lens holding member 2 in the optical axis direction KD.

  Finally, the operation of the lens driving device 101 configured as described above will be briefly described.

  First, in the lens driving device 101, since both ends of the coil 35 are electrically connected to the power supply terminal T9C and the power supply terminal T9E via the lower plate spring 3C and the lower plate spring 3E, the power supply terminal T9C and the power supply terminal are connected. A current can flow from the terminal T9E to the coil 35. On the other hand, the magnetic flux from the driving magnet 55 emits the driving magnet 55, passes through the coil 35, and returns to the driving magnet 55.

  When an electric current is passed through the coil 35 from the power supply terminal T9C side from the initial state shown in FIG. 6, an electromagnetic force is generated in the coil 35 from the Z1 direction, which is the optical axis direction KD, to the Z2 direction in accordance with Fleming's left-hand rule. . Then, the lens holding member 2 moves in the Z2 direction. On the other hand, when a current is passed through the coil 35 from the power supply terminal T9E side, an electromagnetic force is generated from the Z2 direction, which is the optical axis direction KD, in the Z1 direction, and the lens holding member 2 moves in the Z1 direction.

  In this way, when the current flows through the coil 35, the lens driving device 101 causes the biasing force of any one of the upper leaf spring 3A, the lower leaf spring 3C, and the lower leaf spring 3E by the electromagnetic force generated in the coil 35. On the other hand, a lens body (not shown) can be integrated with the lens holding member 2 and moved along the optical axis direction KD (Z direction shown in FIG. 2). The current flowing through the coil 35 is controlled based on the positional accuracy of the lens holding member 2 in the optical axis direction KD detected by the position detecting means K7.

  The effects of the lens driving device 101 according to the first embodiment of the present invention configured as described above will be described below.

  Unlike the conventional example, the lens driving device 101 according to the first embodiment of the present invention is different from the elastic arm portion 53a provided between the first portion 13 and the second portion 23 of the upper leaf spring 3A. Since it has a configuration in which an extension portion 63 extending from the portion 13 is provided and a damper material GE is provided between the extension portion 63 and the fixed side member R4, the first portion fixed to the lens holding member 2 is provided. The damper material GE connects between the portion extended from the first portion 13 and the stationary member R4 to which the second portion 23 is fixed. For this reason, even if a strong impact is applied by dropping or the like, and the elastic arm portion 53a is undesirably greatly deformed, the extension portion 63 and the damper material GE are not affected by the deformation of the elastic arm portion 53a. However, it is difficult for the extended portion 63 (the upper leaf spring 3A) or the fixed-side member R4 to come off or break. As a result, even when a strong impact is applied due to dropping or the like, the vibration in the optical axis direction KD (that is, the time until the lens holding member 2 settles in a predetermined position) converges in a short time by the damper material GE. The so-called damper effect can be ensured.

  Further, since the extending portions 63 extending from the adjacent first portions 13 are connected to form one connecting portion, the extending portion 63 (connecting portion) is given a certain degree of rigidity. Even if a strong impact such as dropping is applied, the extended portion 63 is prevented from moving undesirably large. Further, since the damper material GE is provided at the intermediate portion of the connecting portion (extending portion 63), the extending portion 63 and the fixed side member are separated from the first portion 13 fixed to the lens holding member 2. When R4 is connected by the damper material GE and vibration is generated in the lens holding member 2, the extending portion 63 moves more independently with good balance. For this reason, it can be made harder for the damper material GE to be detached from the upper leaf spring 3A or to be broken.

  Further, since the damper material GE is held in the concave portion 44r provided in the first extending portion 44A of the frame-like member 44 so as to embed the protruding piece 63t provided in the extending portion 63, the configuration is simple. However, the upper plate spring 3A (extension portion 63) fixed to the lens holding member 2 and the frame-like member 44 (first extension portion 44A) which is the fixed side member R4 are easily connected by the damper material GE. Can do. Moreover, since the protruding piece 63t enters the recess 44r and the damper material GE is reliably held in the recess 44r, the lens holding member 2 and the fixed member R4 can be reliably connected. For this reason, even if a strong impact such as dropping is applied, the damper material GE is unlikely to come off from the recess 44r, and the damper material GE may come off from the upper leaf spring 3A or the frame-like member 44 (fixed side member R4) or break. It becomes difficult.

  In addition, since the plurality of recesses 44r are provided, and the protruding pieces 63t and the damper material GE are respectively provided corresponding to the plurality of recesses 44r, the damper effect can be enhanced and, in the unlikely event, one damper material is provided. Even if the GE comes off, the damper effect can be maintained with the damper material GE in other portions. Thus, even when vibration is generated in the lens holding member 2, it is possible to reliably ensure a damper effect that suppresses the vibration by the damper material GE.

  In addition, a recess 44r is provided in the intermediate portion of the first extending portion 44A of the frame-like member 44, and the upper leaf spring 3A of the upper leaf spring 3A is opposed to the intermediate portion of the second extending portion 44B of the frame-like member 44. Since the first portion 13 is located, the damper material GE that connects the fixed side member R4 (frame-like member 44) and the upper leaf spring 3A is provided at a position facing the optical axis, and the lens holding member 2 The first portion 13 that fixes the upper leaf spring 3A and the upper leaf spring 3A is provided at a position facing each other across the optical axis. For this reason, the upper leaf spring 3A is connected at four positions, and the vibration of the lens holding member 2 can be suppressed with a good balance. Furthermore, the extending portion 63 of the upper leaf spring 3A can be lengthened, and the extending portion 63 can be moved more independently of the lens holding member 2.

  Further, since the damper material GE is in a gel form, it is possible to exhibit a damper effect that suppresses the vibration of the lens holding member 2 while allowing the extension portion 63 of the upper leaf spring 3A to move within the damper material GE. Further, it can be easily provided between the extending portion 63 and the fixed member R4.

  In addition, this invention is not limited to the said embodiment, For example, it can deform | transform and implement as follows, These embodiments also belong to the technical scope of this invention.

<Modification 1>
In the said 1st Embodiment, although comprised suitably so that each extension part 63 extended from the 1st part 13 which adjoins adjacently may be connected, and forms one connection part, it is restricted to this. For example, a configuration in which the adjacent portion facing the crosspiece 73 is cut off may be used.

<Modification 2>
In the first embodiment, the pair of opposite sides of the frame-shaped member 44 is the first extending portion 44A, and the other set of sides intersecting with the first extending portion 44A is the second extending portion. Although configured as 44B, the present invention is not limited to this. For example, the first extending portion extends from a set of sides facing each other and is provided along the set of sides, respectively, and the second extending portion 44B is set to another set of sides. It suffices to extend along the sides of this set (the other set). That is, for example, the first extension portion may be provided separately from the set of sides along one set of sides, or the second extension portion may be provided along the other set of sides. It may be provided separately from the set of sides.

<Modification 3>
In the first embodiment, in the initial state of the lens driving device 101, an urging force in such a direction that the upper leaf spring 3A, the lower leaf spring 3C, and the lower leaf spring 3E are pressed against each other is applied to the lens holding member 2. However, the present invention is not limited to this, and the direction of the biasing force in the initial state may be the same. For example, the urging forces of the upper leaf spring 3A, the lower leaf spring 3C, and the lower leaf spring 3E all act in the direction of pushing the lens holding member 2 downward. In the initial state, the lens holding member 2 is the base member 8. You may contact | abut. Even in this case, the first portion 13 and the extending portion 63 of the upper leaf spring 3 </ b> A are located above the second portion 23.

<Modification 4>
In the first embodiment, the lens holding device 2 is the lens driving device 101 in which the focus adjustment is performed by moving the lens holding member 2 in the optical axis direction KD, but is not limited to the device having only this function. For example, the present invention may be applied to a lens driving device having a so-called camera shake correction function in which the lens holding member 2 is configured to be movable in a direction intersecting the optical axis direction KD.

  The present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the scope of the object of the present invention.

2 Lens holding member 3 Biasing member 3A Upper leaf spring 3C, 3E Lower leaf spring 13 First portion 23 Second portion 53a Elastic arm portion 63 Extension portion 63t Projection piece R4 Fixed side member 44 Frame-like member 44A First extension Part 44B Second extending part 44r Concave part M5 Driving mechanism 35 Coil 55 Driving magnet GE Damper material KD Optical axis direction 101 Lens driving device

Claims (6)

A cylindrical lens holding member capable of holding a lens body, a biasing member that supports the lens holding member so as to be movable in the optical axis direction, a fixed-side member that fixes a part of the biasing member, and the lens In a lens driving device provided with a driving mechanism that moves the holding member along the optical axis direction,
The biasing member has an upper leaf spring fixed to the upper portion of the lens holding member, and a lower leaf spring fixed to the lower portion;
A first portion fixed to the lens holding member; a second portion positioned on the outer peripheral side of the first portion and fixed to the fixed side member; the first portion and the first portion; An elastic arm portion provided between the two portions,
The upper leaf spring is formed with an extending portion extending from the first portion,
A lens driving device comprising a damper material straddling between the extending portion and the fixed side member. The upper leaf spring is provided with a plurality of the first portions,
The extending portions respectively extending from the adjacent first portions are connected to form a connecting portion;
The lens driving device according to claim 1, wherein the damper material is provided in an intermediate portion of the connecting portion. The fixed side member has a frame-shaped member to which the second portion is fixed,
The frame-like member is provided with a first extending portion extending along the outer peripheral side of the extending portion,
The first extension part is provided with a recess that opens to the extension part side,
The extending portion is provided with a protruding piece protruding so that a part thereof is positioned in the recess,
The lens driving device according to claim 1, wherein the damper material is held in the concave portion so as to bury at least a part of the protruding piece. A plurality of the recesses are provided in the first extension part, and a plurality of the protruding pieces are provided in the extension part corresponding to the recesses,
The lens driving device according to claim 3, wherein the damper material is provided in each of the recesses. The frame-shaped member has a substantially rectangular shape, and the first extending portion is provided along a set of sides facing each other, and another set intersecting the set of sides. A second extending portion is provided along each of the sides,
4. The concave portion is provided in an intermediate portion of the first extending portion, and the first portion is located opposite the intermediate portion of the second extending portion. Or the lens drive device of Claim 4.   6. The lens driving device according to claim 1, wherein the damper material is a gel-like resin material.