JP2016148812A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device that can securely hold a lens barrel.SOLUTION: A lens drive device 101 has a cylindrically shaped lens holding member 12 that can hold a lens barrel 11 provided with a lens, a supporting member 6 that supports the lens holding member 12 to be shiftable in an optical axis direction JD and a drive mechanism M3 that vertically shifts the lens holding member 12 in the optical axis direction JD. In the inner circumferential face 12q of the cylindrical part 12s of the lens holding member 12 into which the lens barrel 11 is inserted, a positioning part 52 whose gap from the lens barrel 11 is constant and an inclined part 92 that is positioned above the positioning part 52 and whose gap from the lens barrel 11 becomes greater in the upper area than the gap from the positioning part 52 are disposed. At least the gap between the inclined part 92 and the lens barrel 11 is filled with adhesive, which fixes the lens barrel 11 to the lens holding member 12.SELECTED DRAWING: Figure 8

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, which is the main part of the camera mechanism mounted on this small portable device, has been increasingly demanded to drive the lens barrel (lens barrel) with high accuracy. As a lens driving device that should satisfy these two requirements, a lens driving device provided with a magnetic circuit for driving a lens holder (lens holding member) that holds a lens barrel (lens barrel) on four sides of the lens holder is well known. .

  In addition, in the lens driving device described above, there are two types of methods for holding the lens barrel on the lens holder: a screw type for fastening both with screws and an adhesive type for fixing using an adhesive. Therefore, the lens barrel can be enlarged to increase the lens diameter, and the mold for producing the lens barrel and the lens holder can be simplified.

  As such an adhesive-type lens driving device, Patent Document 1 (conventional example) proposes a lens driving device 900 as shown in FIG. FIG. 14 is a longitudinal sectional view of a camera module 999 in which a conventional lens driving device 900 is used.

  A lens driving device 900 illustrated in FIG. 14 includes a movable unit that moves a lens barrel 907 that holds a plurality of imaging lenses 906 in the optical axis direction, and a fixed unit that does not vary in position when the imaging lens 906 is driven. The movable part is accommodated inside the fixed part. Further, as shown in FIG. 14, the lens driving device 900 includes a lens holder 908 that holds a lens barrel 907 as a movable portion, a coil 910 that is fixed to an outer peripheral end portion (flange portion) of the lens holder 908, and have. Further, as shown in FIG. 14, the lens driving device 900 includes a base 915 that constitutes a bottom part, a yoke 911 that is fixed on the base 915 and constitutes a side part, and an inner part of the yoke 911. A permanent magnet 912 disposed on the side surface and a cover 914 disposed above the yoke 911 and constituting an upper portion (top surface) are provided. In this adhesive type lens driving device 900, a thermosetting UV adhesive or an anaerobic UV adhesive is suitably used for fixing the lens barrel 907 and the lens holder 908, and the lens holder An adhesive is inserted into a gap between the lens barrel 907 and the lens barrel 907, and a raised fillet (adhesive) 924 is formed on the lens holder 908 and the lens barrel 907 surface.

JP 2010-134409 A

  However, in the conventional example, since the gap between the lens barrel 907 and the lens holder 908 is constant and narrow (so narrow that it cannot be shown in FIG. 14), the adhesive strength between the lens barrel 907 and the lens holder 908 becomes weak. There is a problem that the lens barrel 907 may come off when a strong impact is applied to the lens driving device 900 due to dropping or the like.

  The present invention solves the above-described problems, and an object of the present invention is to provide a lens driving device that can reliably hold a lens barrel.

  In order to solve this problem, a lens driving device according to the present invention includes a cylindrical lens holding member that can hold a lens barrel provided with a lens, and a support that supports the lens holding member so as to be movable in the optical axis direction. In a lens driving device comprising a member and a drive mechanism for moving the lens holding member up and down along the optical axis direction, an inner peripheral surface of a cylindrical portion of the lens holding member through which the lens barrel is inserted Is provided with a positioning portion having a constant gap with the lens barrel, and an inclined portion with a gap between the lens barrel and the positioning portion that is located above the positioning portion and upward. An adhesive is filled at least between the inclined portion and the lens barrel, and the lens barrel is fixed to the lens holding member by the adhesive. There.

  According to this, the lens driving device of the present invention can reliably and sufficiently fill the adhesive between the lens holding member and the lens barrel. For this reason, the adhesive strength between the lens holding member and the lens barrel can be increased. Thus, even when a strong impact is applied to the lens driving device due to dropping or the like, the lens barrel can be securely held.

  In the lens driving device of the present invention, a boundary portion between the positioning portion and the inclined portion is located below an intermediate position of the cylindrical portion in the optical axis direction.

  According to this, it is possible to secure more of the adhesive filling region formed by the inclined portion and the lens barrel. Accordingly, the adhesive strength between the lens holding member and the lens barrel can be further increased, and the lens barrel can be more reliably held even when a strong impact is applied to the lens driving device due to dropping or the like. .

  The lens driving device according to the present invention further includes a first inclined portion and a second inclined portion having different inclination angles, which are angles formed by the straight portion along the optical axis direction, and the second inclined portion. The inclination angle of the first inclination portion is larger than the inclination angle of the first inclination portion, the second inclination portion is disposed above the lens holding member with respect to the first inclination portion, and the second inclination portion and the first inclination portion The adhesive is filled between one inclined portion and the lens barrel.

  According to this, it is possible to further secure an adhesive filling region formed by the inclined portion and the lens barrel, and in particular, it is possible to form an adhesive layer that spreads to the second inclined portion side. . For this reason, the adhesive strength between the lens holding member and the lens barrel can be further increased, and in particular, the adhesive layer becomes a wedge, and the lens barrel can be hardly pulled downward. Thereby, even when a strong impact is applied to the lens driving device due to dropping or the like, the lens barrel can be held more reliably.

  Further, in the lens driving device of the present invention, a protrusion projecting from the outer periphery toward the direction intersecting the optical axis direction is provided on the lower side of the lens barrel, and the lens barrel is provided on the lens holding member. It is characterized by being inserted into the cylindrical portion from the lower side and the projecting portion being arranged to face the lower end portion of the cylindrical portion.

  According to this, even if a strong impact is applied to the upper side of the lens barrel due to dropping or the like, the protrusion and the lower end can be brought into contact with each other, thereby eliminating the possibility of the lens barrel coming off upward. Can do.

  The lens driving device of the present invention is characterized in that a groove capable of accommodating the adhesive is formed on the outer peripheral surface of the lens barrel.

  According to this, the groove portion is filled with the adhesive, and it is possible to further secure an adhesive filling region formed by the outer peripheral surface of the lens barrel and the inclined portion of the lens holding member. As a result, the adhesive strength between the lens barrel and the lens holding member can be further increased, and even if a strong impact is applied to the lens driving device due to dropping or the like, the lens barrel is further improved by the lens holding member. It can be held securely.

  The lens driving device of the present invention can reliably and sufficiently fill the adhesive between the lens holding member and the lens barrel. For this reason, the adhesive strength between the lens holding member and the lens barrel can be increased. Thus, even when a strong impact is applied to the lens driving device due to dropping or the like, the lens barrel can be securely held.

It is a disassembled perspective view explaining the lens drive device of 1st Embodiment of this invention. 2A and 2B are diagrams illustrating the lens driving device according to the first embodiment of the present invention, in which FIG. 2A is a perspective view, and FIG. 2B is a side view as viewed from the X1 side illustrated in FIG. FIG. 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 seen from the Z1 side shown in FIG. 2, and FIG. It is the bottom view seen from the Z2 side shown. 4A and 4B are views for explaining a lens barrel of the lens driving device according to the first embodiment of the present invention, in which FIG. 4A is a perspective view of the lens barrel holding the lens, and FIG. It is a side view of the lens barrel seen from the X1 side shown to Fig.4 (a). FIG. 5A is a diagram illustrating the lens driving device according to the first embodiment of the present invention, and FIG. 5A is a cross-sectional view taken along line IV-IV shown in FIG. 3A, and FIG. It is sectional drawing in the VV line shown to Fig.3 (a). It is a figure explaining the lens holding member of the lens drive device concerning a 1st embodiment of the present invention, and Drawing 6 (a) is an upper perspective view of the lens holding member seen from the Z1 side shown in Drawing 1, 6B is a lower perspective view of the lens holding member viewed from the Z2 side shown in FIG. It is a figure explaining the lens holding member of the lens drive device concerning a 1st embodiment of the present invention, and is the perspective view showing the state where the coil was wound around the lens holding member. It is a figure explaining the lens drive device concerning 1st Embodiment of this invention, Comprising: It is an expanded sectional view of the P section shown to Fig.5 (a). FIG. 9A is a diagram for explaining the yoke of the lens driving device according to the first embodiment of the present invention, and FIG. 9A is an upper perspective view of the yoke viewed from the Z1 side shown in FIG. FIG. 3 is a lower perspective view of the yoke as viewed from the Z2 side shown in FIG. It is a figure explaining the lens drive device of 1st Embodiment of this invention, Comprising: It is the perspective view which abbreviate | omitted the lens barrel and yoke shown to Fig.2 (a). It is a figure explaining the supporting member of the lens drive device concerning a 1st embodiment of the present invention, and Drawing 11 (a) is a top view of the upper leaf spring which is a supporting member, and Drawing 11 (b) It is a top view of the lower leaf | plate spring which is a supporting member. FIGS. 12A and 12B are diagrams illustrating a fixing mechanism of the lens driving device according to the first embodiment of the present invention, in which FIG. 12A is a perspective view of a base member, and FIG. It is the perspective view which assembled | attached the spring. It is a perspective view of the lens holding member explaining the modification 1 of the lens drive device concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the camera module in which the lens drive device of the prior art example was used.

  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. 2A is a perspective view of the lens driving device 101, and FIG. 2B is a side view of the lens driving device 101 viewed from the X1 side shown in FIG. 2A. 3A is a top view of the lens driving device 101 viewed from the Z1 side shown in FIG. 2, and FIG. 3B is a bottom view of the lens driving device 101 viewed from the Z2 side shown in FIG. is there.

  The lens driving device 101 according to the first embodiment of the present invention has a rectangular parallelepiped appearance as shown in FIGS. 2 and 3, and as shown in FIG. 1, a lens barrel 11 provided with a lens RNZ, and a lens barrel. A lens holding member 12 having a cylindrical portion 12s through which the lens 11 is inserted, a drive mechanism M3 that moves the lens holding member 12 up and down along the optical axis direction JD (the Z direction shown in FIG. 2), and the lens holding member 12. And a support member 6 (specifically, an upper leaf spring 16, a lower leaf spring 26 </ b> A, and a lower leaf spring 26 </ b> B, which will be described later), which are movably supported in the optical axis direction JD. In addition, the lens driving device 101 according to the first embodiment of the present invention includes a fixing mechanism R8 that fixes a part of the support member 6 and a terminal 7 that is electrically connected to the outside.

  Further, in the lens driving device 101 according to the first embodiment of the present invention, as shown in FIG. 1, the driving mechanism M3 serves as an octagonal annular coil 33 and a rectangular box-like outer case. The yoke 34 and four magnets 35 disposed to face the four sides of the coil 33 are provided. Further, as shown in FIG. 1, the fixing mechanism R8 is mainly composed of a base member 18 in which the terminals 7 are embedded.

  The lens driving device 101 is mounted on a substrate on which an imaging element (not shown) is mounted with the lens barrel 11 fixed to the lens holding member 12 with an adhesive. Then, the lens driving device 101 is energized to the coil 33 from the power supply from the substrate, and the lens holding member 12 disposed above the image pickup device is moved by the electromagnetic force generated by the driving mechanism M3 in the optical axis direction JD ( It is moved along the Z direction shown in FIG. That is, the lens driving device 101 moves the lens RNZ held in the lens barrel 11 in the direction away from the image pickup device to enable macro photography, and moves the lens RNZ held in the lens barrel 11 closer. It allows you to shoot at infinity.

  Next, each component of the lens driving device 101 will be described in detail with reference to the drawings. First, the lens barrel 11 of the lens driving device 101 will be described. 4A and 4B are diagrams for explaining the lens barrel 11. FIG. 4A is a perspective view of the lens barrel 11 holding the lens RNZ, and FIG. 4B is a diagram in FIG. It is a side view of the lens barrel 11 seen from the X1 side shown. FIG. 5 is a diagram for explaining the lens driving device 101 according to the first embodiment of the present invention. FIG. 5A is a cross-sectional view taken along the line IV-IV shown in FIG. (B) is sectional drawing in the VV line shown to Fig.3 (a).

  The lens barrel 11 of the lens driving device 101 is manufactured by injection molding using a synthetic resin such as polyamide resin (PA), and has a cylindrical shape as shown in FIG. The lens RNZ is housed in the cylinder of the lens barrel 11 as shown in FIG. In FIG. 5, five large and small lenses RNZ having different cross-sectional shapes are shown, but the shape and the number thereof are not limited thereto.

  Further, on the lower side of the lens barrel 11, as shown in FIG. 4, there is a protrusion 11t protruding from the outer periphery of the lens barrel 11 in the crossing direction (XY plane direction in FIG. 4) intersecting the optical axis direction JD. When the lens driving device 101 is assembled, the projection 11t is provided with a cylindrical portion 12s (specifically, a lower end to be described later) of the lens holding member 12, as shown in FIG. Part 12u). Accordingly, even when a strong impact due to dropping or the like is applied toward the upper side of the lens barrel 11 (Z1 direction side shown in FIG. 5), the protrusion 11t and the lower end 12u can come into contact with each other. The possibility that the barrel 11 is disengaged upward can be eliminated. In addition, in 1st Embodiment of this invention, it was set as the structure which provided the protrusion 11t in a step shape, and was provided over a perimeter, However, it is not restricted to this, For example, one part may protrude from outer periphery. In that case, at least one place, preferably two or more places may be provided.

  Further, as shown in FIG. 4, the outer peripheral surface 11p of the lens barrel 11 is formed with a groove 11u in the direction intersecting the optical axis direction JD over the entire circumference, and when the adhesive is applied, The groove 11u is filled with an adhesive. Thereby, it is possible to secure a large amount of an adhesive filling region formed by the cylindrical portion 12 s (specifically, an inclined portion 92 described later) of the lens holding member 12 and the outer peripheral surface 11 p of the lens barrel 11. Accordingly, the adhesive strength between the lens holding member 12 and the lens barrel 11 can be increased, and the lens barrel 11 is attached to the lens holding member 12 even when a strong impact is applied to the lens driving device 101 due to dropping or the like. It can be held securely.

  Next, the lens holding member 12 of the lens driving device 101 will be described. 6A is an upper perspective view of the lens holding member 12 viewed from the Z1 side shown in FIG. 1, and FIG. 6B is a lower perspective view of the lens holding member 12 viewed from the Z2 side shown in FIG. FIG. FIG. 7 is a perspective view showing a state where the coil 33 is wound around the lens holding member 12. FIG. 8 is an enlarged cross-sectional view of a P portion shown in FIG. In FIG. 8, the adhesive layer AD is schematically shown for easy understanding.

  The lens holding member 12 of the lens driving device 101 is manufactured by injection molding using a synthetic resin such as liquid crystal polymer (LCP), and is formed in a cylindrical shape as shown in FIG. The cylindrical portion 12s has a circular outer peripheral surface 12m and an inner peripheral surface 12q, and a flange portion 12v protruding radially outward from the outer peripheral surface 12m at the lower end of the cylindrical portion 12s. The lens barrel 11 is inserted into the cylindrical portion 12s from the lower side of the lens holding member 12, and the lens barrel 11 is held on the lens holding member 12 by an adhesive.

  As shown in FIG. 6A, the cylindrical portion 12s of the lens holding member 12 is provided with two pedestal portions 12d having concave depressions on the upper end side located at the upper portion thereof (see FIG. 6A). (Two places in the Y direction shown in FIG. 6A). As shown in FIG. 5A, a portion of one side of the upper leaf spring 16 that is the support member 6 (specifically, a first portion 16a described later) is placed on the pedestal portion 12d. Further, as shown in FIG. 6B, the lower end portion 12u located at the lower portion of the cylindrical portion 12s is a flat surface, and when the lens barrel 11 is inserted from below the lens holding member 12, The lower end portion 12u and the projection 11t of the lens barrel 11 face each other so as to be able to come into contact with each other. Thereby, as described above, even when a strong impact is applied to the upper side of the lens barrel 11 due to dropping or the like, the lower end 12u and the protrusion 11t can be in contact with each other. The possibility of falling off can be eliminated. In the first embodiment of the present invention, the lower end 12u has a uniform planar shape and is provided over the entire circumference. However, the present invention is not limited to this. For example, a part of the lower end 12u is downward. The protruding portion may be configured to face the protruding portion 11 t of the lens barrel 11. In that case, at least one place, preferably two or more places may be provided.

  On the outer peripheral surface 12m of the cylindrical portion 12s, as shown in FIG. 6, eight coil support portions 12j for supporting the coil 33 from the inner side are provided equally, and on the upper end side of the coil support portion 12j, Four flange portions 12h are formed so as to face the flange portion 12v and protrude outward in the radial direction. Then, as shown in FIG. 7, the coil 33 is wound in an octagonal shape on the outer peripheral surface 12 m side of the lens holding member 12 so that the coil 33 is supported by the coil support portion 12 j and is sandwiched between the flange portion 12 h and the flange portion 12 v. Yes.

  As shown in FIG. 8, the inner peripheral surface 12 q of the cylindrical portion 12 s has a constant gap with the lens barrel 11 and is positioned above the positioning portion 52 and is positioned higher than the positioning portion 52 as it goes upward. An inclined portion 92 is provided to increase the gap with the lens barrel 11. When the lens barrel 11 is held by the lens holding member 12, the gap between the inclined portion 92 and the lens barrel 11 is surely and sufficiently filled with an adhesive, and the lens barrel 11 is attached to the lens holding member by the adhesive. 12 is fixed. Thereby, the adhesive strength between the lens holding member 12 and the lens barrel 11 can be increased. Thus, even when a strong impact is applied to the lens driving device 101 due to dropping or the like, the lens barrel 11 can be reliably held.

  In addition, when the material of the lens barrel 11 is polyamide resin (PA) and the material of the lens holding member 12 is liquid crystal polymer (LCP), the polyamide resin (PA) generally has better adhesion, so the liquid crystal polymer has poor adhesion. An inclined portion 92 is provided on the (LCP) lens holding member 12. Thereby, since the adhesion area of the lens holding member 12 can be increased and the adhesion strength of the lens holding member 12 can be increased, the adhesion between the lens holding member 12 and the lens barrel 11 can be strengthened. .

  Furthermore, in the first embodiment of the present invention, as shown in FIG. 8, the boundary portion (KP shown in FIG. 8) between the positioning portion 52 and the inclined portion 92 is from the intermediate position in the optical axis direction JD of the cylindrical portion 12s. Is also located on the lower side. In other words, the boundary portion is located below the intermediate position in the vertical direction (Z direction shown in FIG. 8) of the inner peripheral surface 12q of the cylindrical portion 12s. As a result, it is possible to secure a larger adhesive filling area formed by the inclined portion 92 and the lens barrel 11, and to further increase the adhesive strength between the lens holding member 12 and the lens barrel 11. Further, since the groove 11u formed on the outer peripheral surface 11p of the lens barrel 11 is provided at a position facing the inclined portion 92, the groove 11u is surely and sufficiently filled with the adhesive. .

  In addition, when the lens barrel 11 is held by the lens holding member 12, the inclined portion 92 is inclined at an angle formed with a straight line along the optical axis direction JD as viewed in a longitudinal section as shown in FIG. Two first inclined portions 92a and second inclined portions 92b having different angles are provided, and the inclination angle of the second inclined portion 92b is larger than the inclination angle of the first inclined portion 92a. In the first embodiment of the present invention, since the outer periphery of the lens barrel 11 coincides with a straight line along the optical axis direction JD, the angle formed with the outer periphery of the lens barrel 11 can also be referred to as an inclination angle.

  Further, the second inclined portion 92b having a large inclination angle is disposed above the inner peripheral surface 12q of the lens holding member 12 with respect to the first inclined portion 92a, and the adhesive is filled from the second inclined portion 92b side. The adhesive is surely and sufficiently filled between the second inclined portion 92b and the first inclined portion 92a and the lens barrel 11. Thereby, the adhesive layer AD spreading toward the second inclined portion 92b can be formed, and the adhesive strength between the lens holding member 12 and the lens barrel 11 can be further increased. In particular, since the cross-sectional shape of the adhesive layer AD is a wedge shape that spreads upward, the lens barrel 11 is difficult to be pulled downward when a strong downward force is applied.

  As shown in FIG. 6 (b), the flange portion 12v of the lens holding member 12 has two square-shaped tangled portions 12k protruding downward from the bottom surface thereof, and round-shaped protruding portions 12t. There are four places. Both ends of the conducting wire of the coil 33 are wound around the binding portion 12k corresponding to the start and end of winding of the coil 33. In addition, one side portion (specifically, a third portion 26c described later) of the lower leaf spring 26A and the lower leaf spring 26B as the support member 6 is fixed to the projecting portion 12t.

  Next, the driving mechanism M3 of the lens driving device 101 will be described. 9A is an upper perspective view of the yoke 34 in the drive mechanism M3 viewed from the Z1 side shown in FIG. 1, and FIG. 9B is a lower perspective view of the yoke 34 viewed from the Z2 side shown in FIG. FIG. FIG. 10 is a perspective view of the lens driving device 101 in which the lens barrel 11 and the yoke 34 (drive mechanism M3) shown in FIG.

  As described above, the driving mechanism M3 of the lens driving device 101 is opposed to the coil 33 wound in an octagonal annular shape, the rectangular box-shaped yoke 34 also serving as the outer case, and the four sides of the coil 33. And four magnets 35 arranged. And the drive mechanism M3 comprises the magnetic circuit with the electric current which flows into the coil 33, and the magnetism generate | occur | produced from the magnet 35, and moves the lens holding member 12 up and down along the optical axis direction JD.

  First, as shown in FIGS. 1 and 7, the coil 33 of the drive mechanism M <b> 3 is formed by winding a conducting wire with an annular shape and an octagonal angle. In FIGS. 1 and 7, the surface of the conducting wire may be covered with an insulating member, and the detailed winding state of the conducting wire is omitted. Further, as shown in FIG. 7, the coil 33 is disposed at a position surrounding the cylindrical portion 12 s of the lens holding member 12 and is supported from the inside by a coil support portion 12 j (see FIG. 6). A part of the coil 33 is fixed to the upper surface of the flange 12v so that the coil 33 is sandwiched between the flange 12h and the flange 12v. Since the inner peripheral surface 33u of the coil 33 is supported in an isotropically balanced manner by the coil support portion 12j, the lens holding member 12 is brought into contact with the central axis of the coil 33 and the central axis of the lens holding member 12. Retained. As a result, the optical axis of the lens RNZ of the lens barrel 11 held by the lens holding member 12 and the central axis of the lens holding member 12 can be easily matched.

  Next, the yoke 34 of the drive mechanism M3 is produced by punching or drawing a plate of soft magnetic material such as iron, and as shown in FIG. 9, the outer shape is a box having a housing portion 34s. It is formed in a shape. The yoke 34 includes an outer annular outer yoke 34A, a flat upper surface portion 34B provided continuously with the upper end (Z1 side in FIG. 9) of the outer yoke 34A, and a part of the upper surface portion 34B. And four inner yokes 34C extending downward (Z2 direction shown in FIG. 9). Further, step portions 34D positioned below the upper surface portion 34B are provided at the four corners where the inner yoke 34C is formed. As shown in FIG. 2A, the yoke 34 configured in this manner accommodates the lens holding member 12 and the coil 33 (not shown) in the accommodating portion 34s and covers the base member 18 so as to cover it. The outer shape is formed together with the base member 18 by being engaged.

  As shown in FIG. 3A, the outer yoke 34A of the yoke 34 has a rectangular shape in plan view. Further, as shown in FIG. 3A, the inner yoke 34C of the yoke 34 is formed in an arc shape in plan view, and is arranged at equal intervals so as to face the four corners of the outer yoke 34A. Has been. Although not shown in detail, when the lens driving device 101 is assembled, each of the inner yokes 34 </ b> C is disposed along the outer periphery of the cylindrical portion 12 s of the lens holding member 12 and the coil 33. The inner circumferential surface 33u is disposed opposite to the inner circumferential surface 33u. Further, each of the inner yokes 34 </ b> C is disposed at a position facing each of the magnets 35 with the coil 33 interposed therebetween. When the yoke 34 is manufactured by drawing, the inner yoke 34C of the yoke 34 has an arc shape, so that drawing can be easily performed. For this reason, the accuracy of the shape and arrangement position of the inner yoke 34C of the yoke 34 can be increased.

  Finally, as shown in FIG. 1, the magnet 35 of the drive mechanism M3 has a trapezoidal cross-sectional shape and a flat outer shape, and the four magnets 35 are located outside the coil 33 and the yoke 35 34 are equally arranged at the four corners. Further, the two inclined outer surfaces of the trapezoidal shape of the magnet 35 have a shape along the outer yoke 34A. For this reason, when assembling the lens driving device 101, the two outer surfaces can be pressed against the outer yoke 34A and arranged, and the magnet 35 can be positioned easily. Then, as shown in FIG. 5 (b), the magnet 35 holds the yoke 6 with an adhesive so that a part of the support member 6 (upper leaf spring 16) is sandwiched between the step 34D of the yoke 34. 34 is fixed.

  Next, the support member 6 of the lens driving device 101 will be described. 11A and 11B are diagrams illustrating the support member 6, in which FIG. 11A is a top view of the upper leaf spring 16 that is the support member 6, and FIG. 11B is a lower view that is the support member 6. It is a top view of the side leaf spring 26A and the lower leaf spring 26B.

  The support member 6 of the lens driving device 101 is made of a metal plate mainly made of a copper alloy, and as shown in FIG. 10, an upper plate disposed between the lens holding member 12 and the yoke 34. The spring 16 is composed of two lower leaf springs (26A, 26B) disposed between the lens holding member 12 and the base member 18. Then, each of the lens holding member 12 and the support member 6 (upper leaf spring 16, lower leaf spring 26A, lower leaf spring 26B) is engaged, and the lens holding member 12 is in the optical axis direction JD (Z direction shown in FIG. 2). The lens holding member 12 is supported in the air so that it can be moved to (). Note that the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B are electrically connected to both end sides of the coil 33, respectively, and are also used as power feeding members to the coil 33.

  First, as shown in FIG. 11A, the upper leaf spring 16 of the support member 6 has a substantially rectangular shape, two first portions 16 a that are fixed to the lens holding member 12, a yoke 34, and the like. Four second portions 16b sandwiched and fixed by the magnet 35, four elastic arm portions 16g located between the first portion 16a and the second portion 16b, and four second portions 16b And a crosspiece 16r that connects each other.

  When the upper leaf spring 16 is incorporated into the lens driving device 101, as shown in FIG. 10, the first portion 16a is placed on the pedestal portion 12d of the lens holding member 12, and the first portion 16a and the pedestal are placed. By fixing the portion 12d with an adhesive, one side of the upper leaf spring 16 is fixed to the lens holding member 12. Further, as shown in FIG. 5B, the second portion 16 b comes into contact with the upper surface of the magnet 35 and is sandwiched between the yoke 34 and the other side of the upper leaf spring 16 is fixed.

  Further, as shown in FIG. 11A, the upper leaf spring 16 has a substantially line-symmetric shape, and is fixed to the lens holding member 12 at two equal positions of the first portion 16a. At the same time, it is fixed to the yoke 34 integrated with the base member 18 at four equal positions of the second portion 16b. Thereby, the upper leaf spring 16 can support the lens holding member 12 in the air with a good balance.

  As shown in FIG. 11B, the lower leaf springs (16 </ b> A, 16 </ b> B) of the support member 6 have semicircular inner shapes, and are engaged with the lens holding member 12. Three portions 26c, four fourth portions 26d engaged with the base member 18, four elastic arm portions 26g located between the third portions 26c and the fourth portions 26d, and two first portions The two first connecting portions 26p that connect the three portions 26c and the two second connecting portions 26q that connect the two fourth portions 26d are configured.

  When the lower leaf springs (26A, 26B) are incorporated in the lens driving device 101, the four protruding portions 12t of the lens holding member 12 shown in FIG. 6B are shown in FIG. The lower leaf springs (26A, 26B) shown are inserted through and fitted into through holes 26k provided in the third portion 26c. Accordingly, one side of the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B is positioned on the lens holding member 12 and is fixed to the lens holding member 12. At this time, heat projection is applied to the projecting portion 12 t of the lens holding member 12 so that the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B are fixed to the lens holding member 12 more reliably.

  On the other hand, a through hole 26m (see FIG. 11B) provided in the fourth portion 26d of the lower leaf spring (26A, 26B) is inserted into a protruding portion 18t provided on the upper surface of the base member 18 described later. And fitted. Thereby, the other side of the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B is positioned on the base member 18 and fixed to the base member 18.

  Further, as shown in FIG. 11B, the lower leaf spring 26A and the lower leaf spring 26B are configured in a substantially line-symmetric shape, and the four portions of the third portion 26c with respect to the lens holding member 12 are formed. In addition to being connected at an equal position, the base member 18 is connected at four equal positions of the fourth portion 26d. Thereby, the lens holding member 12 can be supported in the air with good balance. Therefore, the support member 6 (upper leaf spring 16, lower leaf spring 26A and lower leaf spring 26B) configured as described above supports the lens holding member 12 so as to be movable in the optical axis direction JD.

  Finally, the fixing mechanism R8 of the lens driving device 101 will be described. 12A is a perspective view of the base member 18 of the fixing mechanism R8, and FIG. 12B is a perspective view in which the lower leaf spring 26A and the lower leaf spring 26B are assembled to the base member 18. As shown in FIG.

  The fixing mechanism R8 of the lens driving device 101 includes a yoke 34 (including a magnet 35) that fixes the second portion 16b, which is the other side of the upper leaf spring 16, and a second side that is the other side of the lower leaf springs (26A, 26B). And a base member 18 for fixing the four portions 26d. Here, since the fixing mechanism R8 of the upper leaf spring 16 has been described in the item of the yoke 34 which is also the drive mechanism M3, description thereof will be omitted, and only the fixing mechanism R8 of the lower leaf spring (26A, 26B) will be described.

  The base member 18 of the fixing mechanism R8 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer (LCP), and has a rectangular plate shape as shown in FIGS. A circular opening 18k is formed at the center. In addition, on the upper surface of the base member 18, four projecting portions 18t projecting upward are provided at the four corners. Then, the projecting portion 18t provided on the upper surface of the base member 18 is inserted into the through hole 26m (see FIG. 11B) provided in the fourth portion 26d of the lower leaf spring (26A, 26B). The through hole 26m and the projecting portion 18t are fitted. At this time, the caulking portion 18t of the base member 18 is heat caulked to more reliably fix the lower leaf spring 26A and the lower leaf spring 26B to the base member 18.

  As shown in FIG. 5B, the base member 18 is embedded with a terminal 7 made of a metal plate made of a material such as copper, iron, or an alloy containing them as a main component. Each of the two electrically insulated terminals 7 (terminal 7A and terminal 7B) is electrically connected to a substrate on which an imaging element (not shown) is mounted, and power can be supplied from these two terminals 7. It is like that. One terminal 7A of the terminal 7 is electrically connected to the lower leaf spring 26A, and the other terminal 7B of the terminal 7 is electrically connected to the lower leaf spring 26B. A current can be passed from the terminal 7B to the coil 33 via the lower leaf spring 26A and the lower leaf spring 26B.

  Further, as shown in FIG. 5, a connection member 57 made of a metal plate using a material such as copper, iron, or an alloy containing them as a main component is insert-molded on the base member 18 in the same manner as the terminal 7. As shown in FIG. 3, a part of the connection member 57 is exposed at the four corners of the yoke 34. Then, after the inner wall of the outer yoke 34A of the yoke 34 and the outer peripheral side surface of the base member 18 are positioned and positioned, four joints between the connection member 57 of the base member 18 and the four corners of the yoke 34 are welded, and the yoke 34 is fixed to the base member 18.

  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.

  In the lens driving device 101 according to the first embodiment of the present invention, the positioning portion 52 is provided on the inner peripheral surface 12q of the cylindrical portion 12s of the lens holding member 12 so that a gap is generated between the lens holding member 12 and the lens barrel 11. Since the inclined portion 92 is provided, the gap between the lens holding member 12 and the lens barrel 11 can be surely and sufficiently filled with the adhesive. For this reason, the adhesive strength between the lens holding member 12 and the lens barrel 11 can be increased. Thus, even when a strong impact is applied to the lens driving device 101 due to dropping or the like, the lens barrel 11 can be reliably held.

  Further, since the boundary portion between the positioning portion 52 and the inclined portion 92 is located below the intermediate position in the optical axis direction JD of the cylindrical portion 12s, an adhesive formed by the inclined portion 92 and the lens barrel 11 is used. More filling area can be secured. As a result, the adhesive strength between the lens holding member 12 and the lens barrel 11 can be further increased, and the lens barrel 11 can be more securely held even when a strong impact is applied to the lens driving device 101 due to dropping or the like. can do.

  The inclined portion 92 includes a first inclined portion 92a and a second inclined portion 92b that is larger than the inclination angle of the first inclined portion 92a, and the second inclined portion 92b is filled with an adhesive. Therefore, it is possible to further secure an adhesive filling region formed by the inclined portion 92 and the lens barrel 11, and in particular, to form the adhesive layer AD spreading toward the second inclined portion 92b. it can. For this reason, the adhesive strength between the lens holding member 12 and the lens barrel 11 can be further increased, and in particular, the adhesive layer AD becomes a wedge, and the lens barrel 11 can be hardly pulled downward. Thus, even when a strong impact is applied to the lens driving device 101 due to dropping or the like, the lens barrel 11 can be held more reliably.

  In addition, a protrusion 11t protruding to the outer peripheral side intersecting the optical axis direction JD is provided at the lower part of the lens barrel 11, and the protrusion 11t is disposed to face the lower end 12u of the cylindrical portion 12s of the lens holding member 12. Therefore, even when a strong impact is applied to the upper side of the lens barrel 11 due to dropping or the like, the protrusion 11t and the lower end 12u can come into contact with each other, so that the lens barrel 11 can be detached upward. Sex can be lost.

  Since the groove 11u is formed on the outer peripheral surface 11p of the lens barrel 11, the groove 11u is filled with an adhesive, and the outer peripheral surface 11p of the lens barrel 11 and the inclined portion 92 of the lens holding member 12 Thus, it is possible to secure an even larger amount of the adhesive filling region formed in step (b). As a result, the adhesive strength between the lens barrel 11 and the lens holding member 12 can be further increased, and even when a strong impact is applied to the lens driving device 101 due to dropping or the like, the lens barrel 11 is attached to the lens. It can hold | maintain more reliably by the holding member 12. FIG.

  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><Modification2>
FIG. 13 is a perspective view of the lens holding member C12 for explaining the first modification. In the first embodiment, the first inclined portion 92a and the second inclined portion 92b are preferably provided over the entire circumference of the inner peripheral surface 12q of the cylindrical portion 12s of the lens holding member 12. However, the present invention is not limited to this. It is not a thing. For example, as shown in FIG. 13, the second inclined portion C92b may be provided only on a part of the inner peripheral surface 12q of the lens holding member 12. Moreover, although not shown in figure, the inclination part in which only the 1st inclination part was formed may be sufficient (modification 2).

<Modification 3>
In the first embodiment, the groove 11u of the lens barrel 11 is formed in a shape that makes a round on the outer peripheral surface 11p. However, the present invention is not limited to this. For example, a ring shape or a spiral shape may be used. good. Further, it may be a longitudinal groove along the optical axis direction JD instead of the direction intersecting the optical axis direction JD.

  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.

DESCRIPTION OF SYMBOLS 11 Lens barrel 11p Outer peripheral surface 11t Protrusion part 11u Groove part 12, C12 Lens holding member 12q Inner peripheral surface 12s Cylinder part 12u Lower end part 52 Positioning part 92 Inclination part 92a First inclination part 92b, C92b Second inclination part M3 Drive mechanism 6 Support Member R8 Fixing mechanism RNZ Lens JD Optical axis direction 101 Lens driving device

Claims (5)

A cylindrical lens holding member capable of holding a lens barrel provided with a lens;
A support member that supports the lens holding member so as to be movable in the optical axis direction;
A lens driving device comprising: a driving mechanism that moves the lens holding member up and down along the optical axis direction;
On the inner peripheral surface of the cylindrical portion of the lens holding member through which the lens barrel is inserted, there is a positioning portion having a constant gap with the lens barrel, and the positioning portion as it is located above and above the positioning portion. And an inclined portion where a gap with the lens barrel becomes larger than,
A lens driving device, wherein an adhesive is filled at least between the inclined portion and the lens barrel, and the lens barrel is fixed to the lens holding member by the adhesive.   2. The lens driving device according to claim 1, wherein a boundary portion between the positioning portion and the inclined portion is located below an intermediate position of the cylindrical portion in the optical axis direction. The inclined portion includes a first inclined portion and a second inclined portion having different inclination angles, which are angles formed with a straight line along the optical axis direction,
The inclination angle of the second inclined portion is larger than the inclination angle of the first inclined portion;
The second inclined portion is disposed above the lens holding member from the first inclined portion,
The lens driving device according to claim 1, wherein the adhesive is filled between the second inclined portion, the first inclined portion, and the lens barrel. On the lower side of the lens barrel, a protrusion protruding from the outer periphery toward the direction intersecting the optical axis direction is provided,
4. The lens barrel according to claim 1, wherein the lens barrel is inserted into the tube portion of the lens holding member from the lower side, and the protrusion is disposed to face the lower end portion of the tube portion. The lens driving device according to any one of the above. The lens driving device according to any one of claims 1 to 4, wherein a groove capable of accommodating the adhesive is formed on an outer peripheral surface of the lens barrel.