JP6641415B2 - Lens drive - Google Patents

Description

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

  In recent years, it has become common for a camera mechanism to be mounted on a portable device represented by a mobile phone. In addition to the demand for miniaturization, the demand for driving the lens barrel (barrel) with high precision has been increasing in the lens driving device, which is a main component of the camera mechanism mounted on the small portable device. As a lens driving device that satisfies these two requirements, a device in which magnetic circuits for driving a lens holder (lens holding member) that holds a lens barrel (lens barrel) are provided on four sides of the lens holder is well known. .

  Further, in the above-described lens driving device, as a method of holding the lens barrel to the lens holder, there are a screw type in which both are fixed with a screw and an adhesive type in which both are fixed with an adhesive. Since there is no lens barrel, there are merits that the lens barrel can be enlarged and the lens diameter can be increased, and the mold for manufacturing the lens barrel and the lens holder can be formed in a simple shape.

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

  The 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 whose position does not change when the imaging lens 906 is driven. The movable part is housed inside the fixed part. As shown in FIG. 14, the lens driving device 900 includes, as movable parts, a lens holder 908 that holds a lens barrel 907, a coil 910 fixed to an outer peripheral end (flange part) of the lens holder 908, have. As shown in FIG. 14, the lens driving device 900 includes a base 915 forming a bottom portion, a yoke 911 fixed on the base 915 and forming a side portion, and a yoke 911 as a fixing portion. It has a permanent magnet 912 arranged on the side surface, and a cover 914 arranged above the yoke 911 and constituting an upper portion (top surface). The adhesive type lens driving device 900 preferably uses a thermosetting UV adhesive or an anaerobic UV adhesive for fixing the lens barrel 907 and the lens holder 908. An adhesive is inserted into a gap between the lens barrel 908 and the lens barrel 907, and a fillet (adhesive) 924 raised on the surface of the lens holder 908 and the lens barrel 907 is formed.

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 (as not shown in FIG. 14), the adhesive strength between the lens barrel 907 and the lens holder 908 becomes weak. Therefore, 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 a drop or the like.

  An object of the present invention is to solve the above-described problem, and to provide a lens driving device capable of reliably holding a lens barrel.

In order to solve this problem, a lens driving device according to the present invention includes a cylindrical lens holding member capable of holding a lens barrel provided with a lens, and a support for supporting the lens holding member so as to be movable in an optical axis direction. In a non-screw type lens driving device including a member and a driving mechanism that moves the lens holding member up and down along the optical axis direction, the lens barrel and the lens holding member are not screwed. A gap between the lens barrel and the lens barrel is fixed to the lens barrel through which the lens barrel is inserted. An inclined portion in which a gap between the lens barrel and the positioning portion is larger than that of the positioning portion, and the lens holding member is viewed from above when viewed from above. The inclined portion is exposed so that a gap extending in a cylindrical shape is formed between the inner peripheral surface of the cylindrical portion of the lens holding member and the lens barrel over the entire length of the inner peripheral surface. And a groove on the outer peripheral surface of the lens barrel facing the inclined portion of the lens holding member is formed with a groove capable of accommodating the adhesive, at least the inclined portion and the lens barrel. the adhesive is filled between, and wherein the lens barrel is fixed to the lens holding member by said adhesive. In this case, it is preferable that the lens holding member has a portion adjacent to the inclined portion above the inclined portion, and a diameter of the adjacent portion is equal to or larger than a diameter of the inclined portion.

According to this, the lens driving device of the present invention can reliably and sufficiently fill the gap 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. Accordingly, even when a strong impact is applied to the lens driving device due to a drop or the like, the lens barrel can be reliably held. Further, according to this, the groove is filled with the adhesive, and a more filled region of the adhesive formed by the outer peripheral surface of the lens barrel and the inclined portion of the lens holding member can be secured. . As a result, the adhesive strength between the lens barrel and the lens holding member can be further increased, and even when a strong impact is applied to the lens driving device due to a drop or the like, the lens barrel can be further held by the lens holding member. It can be securely held.

  Further, the lens driving device of the present invention is characterized in that 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, more filling area of the adhesive formed by the inclined portion and the lens barrel can be secured. Thus, 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 a drop or the like. .

  Also, the lens driving device of the present invention has a first inclined portion and a second inclined portion having different inclination angles, which are angles formed by the inclined portion and a straight line along the optical axis direction, and the second inclined portion The inclination angle of the portion is greater than the inclination angle of the first inclination portion, the second inclination portion is disposed above the lens holding member from the first inclination portion, and the second inclination portion and the second inclination portion A feature is that the adhesive is filled between one inclined portion and the lens barrel.

  According to this, the filling area of the adhesive formed by the inclined portion and the lens barrel can be further secured, and in particular, the adhesive layer spreading toward the second inclined portion can be formed. . 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, so that the lens barrel can be hardly pulled down. Thereby, even when a strong impact is applied to the lens driving device due to a drop or the like, the lens barrel can be held more reliably.

  Further, in the lens driving device of the present invention, a projection protruding from an outer periphery in a direction intersecting with the optical axis direction is provided on a lower side of the lens barrel, and the lens barrel is provided on the lens holding member. The projection is inserted into the cylinder from below, and the projection is arranged to face the lower end of the cylinder.

  According to this, even when a strong impact is applied to the upper side of the lens barrel due to a drop or the like, the projection and the lower end can contact each other, so that the possibility of the lens barrel coming off upward is eliminated. Can be.

  ADVANTAGE OF THE INVENTION The lens drive device of this invention can fill an adhesive reliably and sufficiently between a lens holding member and a lens barrel. For this reason, the adhesive strength between the lens holding member and the lens barrel can be increased. Accordingly, even when a strong impact is applied to the lens driving device due to a drop or the like, the lens barrel can be reliably held.

FIG. 2 is an exploded perspective view illustrating the lens driving device according to the first embodiment of the present invention. FIG. 2A is a perspective view illustrating a lens driving device according to a first embodiment of the present invention, and FIG. 2B is a side view as viewed from the X1 side illustrated in FIG. FIG. 3A and 3B are diagrams illustrating a lens driving device according to a first embodiment of the present invention. FIG. 3A is a top view as viewed from the Z1 side illustrated in FIG. 2, and FIG. It is the bottom view seen from the Z2 side shown. FIG. 4A is a diagram illustrating a lens barrel of the lens driving device according to the first embodiment of the present invention. FIG. 4A is a perspective view of a lens barrel holding a lens, and FIG. FIG. 5 is a side view of the lens barrel viewed from the X1 side shown in FIG. FIG. 5A is a diagram illustrating a lens driving device according to a first embodiment of the present invention. FIG. 5A is a cross-sectional view taken along line IV-IV shown in FIG. 3A, and FIG. FIG. 5 is a cross-sectional view taken along line VV shown in FIG. FIG. 6A is a diagram illustrating a lens holding member of the lens driving device according to the first embodiment of the present invention, and FIG. 6A is an upper perspective view of the lens holding member viewed from the Z1 side illustrated in FIG. FIG. 6B is a lower perspective view of the lens holding member viewed from the Z2 side shown in FIG. FIG. 3 is a diagram illustrating a lens holding member of the lens driving device according to the first embodiment of the present invention, and is a perspective view illustrating a state where a coil is wound around the lens holding member. FIG. 6 is a diagram for explaining a lens driving device according to the first embodiment of the present invention, and is an enlarged cross-sectional view of a portion P shown in FIG. FIG. 9A is a diagram illustrating a 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 illustrated in FIG. 1 and FIG. 2) is a lower perspective view of the yoke as viewed from the Z2 side shown in FIG. FIG. 2 is a diagram illustrating a lens driving device according to a first embodiment of the present invention, and is a perspective view in which a lens barrel and a yoke illustrated in FIG. 2A are omitted. FIG. 11A is a diagram illustrating a support member of the lens driving device according to the first embodiment of the present invention, where FIG. 11A is a top view of an upper leaf spring that is a support member, and FIG. It is a top view of the lower leaf spring which is a support member. 12A and 12B are diagrams illustrating a fixing mechanism of the lens driving device according to the first embodiment of the present invention. FIG. 12A is a perspective view of a base member, and FIG. It is a perspective view in which the spring was assembled. FIG. 6 is a perspective view of a lens holding member for explaining a first modification of the lens driving device according to the first embodiment of the present invention. It is a longitudinal section of the camera module using the lens drive device of the conventional example.

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

[First Embodiment]
FIG. 1 is an exploded perspective view illustrating a lens driving device 101 according to a first embodiment of the present invention. FIG. 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 11. A lens holding member 12 having a cylindrical portion 12s through which the lens 11 is inserted; a driving mechanism M3 for moving the lens holding member 12 up and down along the optical axis direction JD (Z direction shown in FIG. 2); And a supporting member 6 (specifically, an upper leaf spring 16, a lower leaf spring 26A, and a lower leaf spring 26B, which will be described later) for movably supporting in the optical axis direction JD. In addition, the lens driving device 101 according to the first embodiment of the present invention includes the fixing mechanism R8 for fixing a part of the support member 6, and the terminal 7 for electrically connecting to the outside.

  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 octagonally-shaped coil 33 and a rectangular box-shaped outer case. A yoke 34 and four magnets 35 disposed opposite to the four sides of the coil 33. Further, as shown in FIG. 1, the fixing mechanism R8 mainly includes a base member 18 in which the terminals 7 are embedded.

  In the lens driving device 101, a lens barrel 11 is fixed to a lens holding member 12 with an adhesive, and is mounted on a substrate on which an imaging element (not shown) is mounted. Then, the lens driving device 101 is energized from the power supply from the substrate to the coil 33, and the electromagnetic force generated by the driving mechanism M3 causes the lens holding member 12 disposed above the image sensor to move in the optical axis direction JD ( (Z direction shown in FIG. 2). That is, the lens driving device 101 moves the lens RNZ held by the lens barrel 11 in a direction away from the image sensor to enable macro shooting, and moves the lens RNZ held by the lens barrel 11 in a direction to approach the lens RNZ. This allows infinity photography.

  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 views for explaining the lens barrel 11, FIG. 4A is a perspective view of the lens barrel 11 holding the lens RNZ, and FIG. It is the side view of the lens barrel 11 seen from the X1 side shown. FIG. 5 is a diagram illustrating the lens driving device 101 according to the first embodiment of the present invention. FIG. 5A is a cross-sectional view taken along line IV-IV shown in FIG. FIG. 5B is a sectional view taken along line VV shown in FIG.

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

  Further, on the lower side of the lens barrel 11, as shown in FIG. 4, a protrusion 11t protruding from the outer periphery of the lens barrel 11 in an intersecting direction (the XY plane direction in FIG. 4) crossing the optical axis direction JD. When the lens driving device 101 is assembled, as shown in FIG. 5, the projection 11t is provided on the cylindrical portion 12s of the lens holding member 12 (specifically, a lower end described later). The portion 12u) is disposed opposite to the portion 12u). Thereby, even when a strong impact is applied toward the upper side (Z1 direction side shown in FIG. 5) of the lens barrel 11 due to a drop or the like, the projection 11t and the lower end 12u can come into contact with each other. The possibility that the barrel 11 comes off upward can be eliminated. In the first embodiment of the present invention, the protrusion 11t is formed in a stepped shape and provided over the entire circumference. However, the present invention is not limited to this. For example, a part may protrude from the outer circumference. At that time, at least one, preferably at least two, locations are provided.

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

  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 sectional view of a portion P shown in FIG. In FIG. 8, the adhesive layer AD is schematically illustrated 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 a liquid crystal polymer (LCP, Liquid Crystal Polymer), and is formed in a cylindrical shape as shown in FIG. A cylindrical portion 12s having 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 below 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, two pedestal portions 12d having a concave recess at the upper end located at an upper portion thereof are provided opposite to the cylindrical portion 12s of the lens holding member 12 (see FIG. 6A). (Two places in the Y direction shown in FIG. 6A). As shown in FIG. 5A, a portion on one side of the upper leaf spring 16 as the support member 6 (specifically, a first portion 16a described later) is placed on the pedestal portion 12d. Further, as shown in FIG. 6B, a lower end portion 12u located below 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 12u and the projection 11t of the lens barrel 11 are opposed to each other so as to be in contact with each other. Accordingly, as described above, even when a strong impact is applied to the upper side of the lens barrel 11 due to a drop or the like, the lower end portion 12u and the protrusion 11t can abut, so that the lens barrel 11 Can be eliminated. In the first embodiment of the present invention, the lower end portion 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 portion 12u may be downward. The lens barrel 11 may be configured to project toward the projection 11t of the lens barrel 11. At that time, at least one, preferably at least two, locations are provided.

  As shown in FIG. 6, on the outer peripheral surface 12m of the cylindrical portion 12s, eight coil support portions 12j for supporting the coil 33 from the inside are equally provided, and on the upper end side of the coil support portion 12j, Four eaves 12h are formed facing the flange 12v and projecting radially outward. Then, as shown in FIG. 7, the coil 33 is wound in an octagonal shape on the outer peripheral surface 12m side of the lens holding member 12 such that the coil 33 is supported by the coil supporting portion 12j and is sandwiched between the eaves portion 12h and the flange portion 12v. I have.

  As shown in FIG. 8, the inner peripheral surface 12q of the cylindrical portion 12s has a positioning portion 52 with a constant gap from the lens barrel 11, and the positioning portion 52 is located above the positioning portion 52 and is located upward. And an inclined portion 92 having a large 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 reliably and sufficiently filled with an adhesive, and the lens barrel 11 is held 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 a drop or the like, the lens barrel 11 can be reliably held.

  Further, when the material of the lens barrel 11 is a polyamide resin (PA) and the material of the lens holding member 12 is a liquid crystal polymer (LCP), the polyamide resin (PA) generally has better adhesiveness, and therefore, the liquid crystal polymer having poor adhesiveness is used. The (LCP) lens holding member 12 is provided with an inclined portion 92. Accordingly, the bonding area of the lens holding member 12 can be increased, and the bonding strength of the lens holding member 12 can be increased, so that the bonding between the lens holding member 12 and the lens barrel 11 can be increased. .

  Further, in the first embodiment of the present invention, as shown in FIG. 8, the boundary between the positioning portion 52 and the inclined portion 92 (KP shown in FIG. 8) is located at an intermediate position of the cylindrical portion 12 s in the optical axis direction JD. Is also located below. 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. Thereby, a larger filling area of the adhesive formed by the inclined portion 92 and the lens barrel 11 can be secured, and the bonding strength between the lens holding member 12 and the lens barrel 11 can be further increased. 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 reliably and sufficiently filled with the adhesive. .

  When the lens barrel 11 is held by the lens holding member 12, as shown in FIG. 8, the inclined portion 92 has an inclination which is an angle formed with a straight line along the optical axis direction JD in a longitudinal sectional view. It has two first inclined portions 92a and second inclined portions 92b having different angles, and the inclined angle of the second inclined portion 92b is larger than that 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, an angle between the outer periphery of the lens barrel 11 and the outer periphery of the lens barrel 11 is also referred to as an inclination angle.

  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 gap between the lens barrel 11 and the second inclined portion 92b and the first inclined portion 92a is surely and sufficiently filled with the adhesive. 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, when a strong downward force is applied, the lens barrel 11 is unlikely to fall down.

  As shown in FIG. 6B, the flange portion 12v of the lens holding member 12 has two rectangular convex binding portions 12k projecting downward from the bottom surface thereof and a round convex projecting portion 12t. There are four locations. Both ends of the conductive wire of the coil 33 are entangled with the entangled portion 12k corresponding to the start and end of the winding of the coil 33. Further, one side portion (specifically, a third portion 26c described later) of the lower leaf spring 26A and the lower leaf spring 26B, which are the support members 6, is fixed to the protruding 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 as viewed from the Z1 side shown in FIG. 1, and FIG. 9B is a lower perspective view of the yoke 34 as 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 (driving mechanism M3) shown in FIG. 2A are omitted.

  As described above, the driving mechanism M3 of the lens driving device 101 includes an octagonally-shaped coil 33, a rectangular box-shaped yoke 34 also serving as an outer case, and four sides of the coil 33. And four magnets 35 arranged. The drive mechanism M3 forms a magnetic circuit with the current flowing through the coil 33 and the magnetism generated by 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 driving mechanism M3 is formed by winding a conductive wire with an octagonal angle in an annular shape. In FIGS. 1 and 7, the conductive wire may be covered with an insulating member, and the detailed winding state of the conductive wire is omitted. As shown in FIG. 7, the coil 33 is disposed at a position surrounding the cylindrical portion 12s of the lens holding member 12, and is supported from the inside by the coil support portion 12j (see FIG. 6). The coil 33 is fixed to the upper surface of the flange 12v such that a part of the coil 33 is sandwiched between the eaves 12h and the flange 12v. Since the inner peripheral surface 33u of the coil 33 is isotropically and well-balanced by the coil supporting portion 12j, the lens holding member 12 is fixed to the lens holding member 12 in a state where the center axis of the coil 33 and the center axis of the lens holding member 12 match. Will be retained. Thereby, it becomes easy to easily match the optical axis of the lens RNZ of the lens barrel 11 held by the lens holding member 12 with the central axis of the lens holding member 12.

  Next, the yoke 34 of the drive mechanism M3 is manufactured by punching or drawing a plate of a soft magnetic material such as iron, and as shown in FIG. 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 (the Z1 side shown 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). At four corners where the inner yoke 34C is formed, a step portion 34D located below the upper surface portion 34B is provided. As shown in FIG. 2A, the yoke 34 configured as described above accommodates and covers the lens holding member 12 and the coil 33 (not shown) in the accommodation portion 34s. When engaged, it forms an outer shape together with the base member 18.

  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 disposed at equal intervals so as to face the four corners of the outer yoke 34A. Have been. Although not shown in detail, when the lens driving device 101 is assembled, each of the inner yokes 34C is arranged along the outer periphery of the cylindrical portion 12s of the lens holding member 12, and the coils 33 Is disposed facing the inner peripheral surface 33u. Further, each of the inner yokes 34C 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, since the inner yoke 34C of the yoke 34 has an arc shape, 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 improved.

  Lastly, as shown in FIG. 1, the magnet 35 of the drive mechanism M3 has a trapezoidal cross section and a flat outer shape. The four magnets 35 are located outside the coil 33, and 34 are equally arranged at the four corners. The two inclined outer surfaces of the trapezoidal shape of the magnet 35 are shaped 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 easily positioned. Then, as shown in FIG. 5B, the magnet 35 holds the part of the support member 6 (the upper leaf spring 16) between the stepped portion 34D of the yoke 34 and the yoke 34 with the adhesive. 34.

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

  The supporting 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. It comprises a spring 16 and 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 supporting member 6 (upper leaf spring 16, lower leaf spring 26A, lower leaf spring 26B) is engaged, and the lens holding member 12 is moved in the optical axis direction JD (Z direction shown in FIG. 2). The lens holding member 12 is supported in the air so that the lens holding member 12 can be moved to ()). Since the lower leaf spring 26A and the lower leaf spring 26B are electrically connected to both ends of the coil 33, the lower leaf spring 26A and the lower leaf spring 26B are also used as power supply members for the coil 33.

  First, the upper leaf spring 16 of the support member 6 has a substantially rectangular shape as shown in FIG. 11A, and includes two first portions 16 a fixed to the lens holding member 12, a yoke 34, 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 connecting the two.

  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 By fixing the portion 12d with the 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 16b abuts on the upper surface of the magnet 35, is sandwiched between the yoke 34, and the other side of the upper leaf spring 16 is fixed.

  As shown in FIG. 11A, the upper leaf spring 16 has a substantially line-symmetrical 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. Thus, the upper leaf spring 16 can support the lens holding member 12 in the air with good balance.

  As shown in FIG. 11B, the lower leaf springs (16A, 16B) of the support member 6 each have a semicircular inner shape, and four lower springs (16A, 16B) 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 portion 26c and the fourth portion 26d, and two It is configured to have two first connection portions 26p connecting the three portions 26c and two second connection portions 26q connecting the two fourth portions 26d.

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

  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 projecting portion 18t provided on the upper surface of the base member 18 described later. And fitted. As a result, the other side of the lower leaf spring 26A and the lower leaf spring 26B is positioned on the base member 18 and fixed to the base member 18.

  Further, the lower leaf spring 26A and the lower leaf spring 26B are formed in a substantially line-symmetrical shape as shown in FIG. 11B, and the four portions of the third portion 26c with respect to the lens holding member 12 are formed. They are connected at equal positions, and are connected to the base member 18 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 lens holding member 12 is movably supported in the optical axis direction JD by the support member 6 (the upper leaf spring 16, the lower leaf spring 26A, and the lower leaf spring 26B) configured as described above.

  Finally, the fixing mechanism R8 of the lens driving device 101 will be described. FIG. 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.

  The fixing mechanism R8 of the lens driving device 101 includes a yoke 34 (including a magnet 35) for fixing the second portion 16b, which is the other side of the upper leaf spring 16, and a second yoke 34, which is the other side of the lower leaf spring (26A, 26B). And a base member 18 for fixing the four portions 26d. Here, the fixing mechanism R8 of the upper leaf spring 16 has been described above in the item of the yoke 34 which is also the driving mechanism M3, and thus the 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). As shown in FIGS. 1 and 12, the base member 18 has a rectangular plate shape. A circular opening 18k is formed at the center. Further, on the upper surface of the base member 18, four projecting portions 18t projecting upward are provided at four corners. Then, a projecting portion 18t provided on the upper surface of the base member 18 is inserted into a 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. In this case, the protruding portion 18t of the base member 18 is subjected to heat caulking 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 terminal 7 made of a metal plate made of a material such as copper, iron, or an alloy containing these as a main component is insert-molded and embedded in the base member 18. Each of the two electrically insulated terminals 7 (terminals 7A and 7B) is electrically connected to a substrate on which an image pickup device (not shown) is mounted, and power can be supplied from these two terminals 7. It has become. The 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 flow from the terminal 7B to the coil 33 via the lower leaf spring 26A and the lower leaf spring 26B.

  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 as in the case of the terminal 7. The connection members 57 are partially exposed at the four corners of the yoke 34 as shown in FIG. 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 combined and positioned, the joint portion between the connecting member 57 of the base member 18 and the four corners of the yoke 34 is welded at four places, and 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.

  The lens driving device 101 according to the first embodiment of the present invention includes the positioning portion 52 on the inner peripheral surface 12q of the cylindrical portion 12s of the lens holding member 12 such that a gap is formed 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 reliably and sufficiently filled with the adhesive. Therefore, 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 a drop or the like, the lens barrel 11 can be reliably held.

  Also, since the boundary between the positioning portion 52 and the inclined portion 92 is located below the intermediate position of the cylindrical portion 12s in the optical axis direction JD, the adhesive formed by the inclined portion 92 and the lens barrel 11 Can be secured more. 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 a drop or the like. can do.

  Also, the inclined portion 92 has a first inclined portion 92a and a second inclined portion 92b 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 the filling area of the adhesive formed by the inclined portion 92 and the lens barrel 11, and particularly to form the adhesive layer AD that spreads to the second inclined portion 92b side. 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 down. Accordingly, even when a strong impact is applied to the lens driving device 101 due to a drop or the like, the lens barrel 11 can be held more reliably.

  In addition, a protrusion 11t protruding to the outer peripheral side intersecting with the optical axis direction JD is provided at a lower portion 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 a drop or the like, the projection 11t and the lower end 12u can come into contact with each other, so that the lens barrel 11 can come off upward. Sex can be eliminated.

  Further, since the groove 11u is formed on the outer peripheral surface 11p of the lens barrel 11, the groove 11u is filled with the adhesive, and the outer peripheral surface 11p of the lens barrel 11 and the inclined portion 92 of the lens holding member 12 are formed. Thus, the filling area of the adhesive formed by the method can be further increased. Thus, 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 by dropping or the like, the lens barrel 11 can be moved to the lens. The holding member 12 can more reliably hold.

  The present invention is not limited to the above-described embodiment, and can be modified and implemented as follows, for example, and these embodiments also belong to the technical scope of the present invention.

<Modification 1><Modification2>
FIG. 13 is a perspective view of a lens holding member C12 illustrating a 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, but the present invention is not limited to this. Not something. 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. Further, although not shown, an inclined portion in which only the first inclined portion is formed may be used (Modification 2).

<Modification 3>
In the first embodiment, the groove 11u of the lens barrel 11 is formed so as to make a round around the outer peripheral surface 11p. However, the present invention is not limited to this. For example, a shape having a plurality of rings may be used, or a spiral shape may be used. good. Further, the groove may be a vertical groove along the optical axis direction JD instead of the direction intersecting with the optical axis direction JD.

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

Reference Signs List 11 lens barrel 11p outer peripheral surface 11t protrusion 11u groove portion 12, C12 lens holding member 12q inner peripheral surface 12s cylindrical portion 12u lower end portion 52 positioning portion 92 inclined portion 92a first inclined portion 92b, C92b second inclined portion 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 for supporting the lens holding member movably in the optical axis direction,
A drive mechanism for moving the lens holding member up and down along the optical axis direction, a non-screw type lens drive device,
The lens barrel and the lens holding member are fixed to each other by an adhesive instead of screwing,
On the inner peripheral surface of the cylindrical portion of the lens holding member through which the lens barrel is inserted, a positioning portion having a constant gap with the lens barrel, and the positioning portion is located above the positioning portion and moves upward. An inclined portion having a larger gap with the lens barrel than that of the lens barrel,
In a top view of the lens holding member viewed from above, the inclined portion is exposed,
It is configured such that a gap extending in a cylindrical shape is formed between the inner peripheral surface of the cylindrical portion of the lens holding member and the lens barrel over the entire length of the inner peripheral surface,
On the outer peripheral surface of the lens barrel, at a position facing the inclined portion of the lens holding member, a groove capable of accommodating the adhesive is formed,
At least the said adhesive between the inclined portion and the lens barrel is filled, the lens driving device, wherein the lens barrel is fixed to the lens holding member by said adhesive. The lens holding member has a portion adjacent to the inclined portion above the inclined portion,
The lens driving device according to claim 1, wherein a diameter of the adjacent portion is equal to or larger than a diameter of the inclined portion.   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. 4. . The inclined portion has a first inclined portion and a second inclined portion having different inclination angles, which are angles formed by 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 with respect to the first inclined portion,
4. The lens driving device according to claim 1, wherein the adhesive is filled between the second barrel and the first barrel and the lens barrel. 5. On the lower side of the lens barrel, a projection is provided that protrudes from the outer periphery in a direction intersecting with the optical axis direction,
5. The lens barrel according to claim 1, wherein the lens barrel is inserted through the cylindrical portion of the lens holding member from below, and the protrusion is disposed to face a lower end of the cylindrical portion. 6. The lens driving device according to any one of the above.