JP2017211673A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device that can suppress a bulge occurring in an elongated dimensional part of a coil.SOLUTION: A lens drive device 101 has: a yoke 1 that has a cylindrical outer barrier part 11 equipped with a pair of first flat plate parts 11a opposing each other; a lens holding member 2 that is capable of holding a lens body; an annular coil 3 that is wound around the lens holding member 2; a pair of tabular magnets 5 that is fixed to an inner face of the first flat plate part 11a, respectively; and an urging member 6 that supports the lens holding member 2 movably in an optical axis direction. The coil 3 has an extension part 13 that opposes the magnet 5 to extend along an extension direction LD of the magnet 5, and the extension part 13 comprises: a parallel part 13p that is located at a center part of the extention part 13, and is parallel with the magnet 5; and a first gradient part 13s that is located on either side of the parallel part 13p, and is formed having a first angle equal to or greater than 0.5° and less than 5° so as to become apart from the magnet 5 as heading for an end of the extension part 13.SELECTED DRAWING: Figure 6

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) for holding a lens barrel (lens barrel) is well known. .

  As such a lens driving device, Patent Document 1 (conventional example) proposes a lens driving device 910 as shown in FIG. FIG. 12 is a perspective cross-sectional view of a conventional lens driving device 910. A lens driving device 910 shown in FIG. 12 includes a cylindrical lens holder 914 for holding a lens assembly (lens barrel), a driving coil 916 fixed to the lens holder 914 and wound in an octagonal cylindrical shape, Four flat permanent magnets 918 arranged to face the drive coil 916, a yoke 920 having a square cylindrical shield yoke 922 (outer cylinder portion) for holding the permanent magnet 918, and a lens holder 914 And a pair of leaf springs (not shown) provided on both sides in the optical axis direction.

JP 2012-88432 A

  However, in the conventional example, since the drive coil 916 is wound in a substantially rectangular shape, there is a problem that a long dimension portion of the drive coil 916 is swollen.

  The present invention solves the above-described problems, and an object thereof is to provide a lens driving device that can suppress the swelling of a coil.

  In order to solve this problem, a lens driving device according to an embodiment of the present invention includes a cylindrical outer wall portion having a pair of first flat plate portions facing each other, an opening portion provided at one end of the outer wall portion. A rectangular yoke having an upper plate portion formed with a cylindrical lens holding member disposed inside the outer wall portion of the yoke and capable of holding a lens body, and wound around the lens holding member. An annular coil, a pair of flat magnets that are respectively fixed to the inner surface of the first flat plate portion and extend in a direction perpendicular to the optical axis direction along the first flat plate portion, and the lens holding member. And a biasing member that is movably supported in the optical axis direction, wherein the coil has an extending portion that faces the magnet and extends along the extending direction of the magnet. And the extension part is in the central part of the extension part. A parallel portion parallel to the magnet, and a first angle not less than 0.5 ° and not more than 5 ° so as to move away from the magnet as it is located on both sides of the parallel portion and toward the end of the extending portion. And a first inclined portion that is formed to have a feature.

  According to this, the coil wound with the conductive wire bulges in the long dimension part, but the extended part of the long dimension part moves away from the magnet as it goes from the parallel part of the central part to the end parts on both sides. Thus, since the 1st inclination part formed with the minute 1st angle is provided, the swelling can be suppressed. For this reason, compared with the case where it does not swell and form a straight line without providing a minute angle, it is possible to form the extending part closer to the straight line, and extend the extending part and the magnet over the entire extending part. It can be made almost parallel. As a result, it is possible to provide a lens driving device in which the distance between the coil and the magnet is stable and the characteristics are less varied.

  The lens driving device according to the embodiment of the present invention can suppress the bulge that occurs in the long dimension portion of the coil.

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 viewed from the X1 side illustrated in FIG. It is a side view. 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. 2A, and FIG. It is the bottom view seen from the Z2 side shown to Fig.2 (a). It is a figure explaining the lens drive device of 1st Embodiment of this invention, Comprising: Fig.4 (a) is sectional drawing in the III-III line shown to Fig.3 (a), FIG.4 (b) is FIG. It is sectional drawing in the IV-IV line shown to Fig.3 (a). FIG. 5A is a diagram illustrating a yoke of the lens driving device according to the first embodiment of the present invention, and FIG. 5A 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 yoke of the lens drive device concerning 1st Embodiment of this invention, a coil, and a magnet, Comprising: In the bottom view shown in FIG.3 (b), a lens holding member, a part of biasing member, a base member FIG. It is a figure explaining the lens holding member of the lens drive device concerning a 1st embodiment of the present invention, and Drawing 7 (a) is an upper perspective view of the lens holding member seen from the Z1 side shown in Drawing 1, FIG. 7B is an upper perspective view showing a state where a coil is wound around the lens holding member. It is a figure explaining the lens holding member of the lens drive device concerning 1st Embodiment of this invention, Comprising: Fig.8 (a) is the perspective view which abbreviate | omitted the yoke and the spacer member in the perspective view shown to Fig.2 (a). FIG. 8B is a top view in which a part of the urging member is omitted from the perspective view shown in FIG. It is a figure explaining the coil of the lens drive device concerning 1st Embodiment of this invention, Comprising: It is an enlarged bottom view of the P section shown in FIG. FIG. 10A is a diagram illustrating an urging member of the lens driving device according to the first embodiment of the present invention, and FIG. 10A is a top view of the upper leaf spring shown in FIG. 10 (b) is a top view of the lower leaf spring shown in FIG. 1 as viewed from the Z1 side. It is a figure explaining the biasing member of the lens drive device concerning 1st Embodiment of this invention, Comprising: It is the perspective view which showed the state in which the lower leaf | plate spring is mounted in the base member. It is a perspective cross-sectional view of the lens drive device of a prior art 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 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. 2A, and FIG. 3B is a lens driving viewed from the Z2 side shown in FIG. 2 is a bottom view of the device 101. FIG. 4A is a cross-sectional view of the lens driving device 101 taken along line III-III shown in FIG. 3A, and FIG. 4B is a lens drive taken along line IV-IV shown in FIG. 2 is a sectional view of the device 101. FIG.

  The lens driving device 101 according to the first embodiment of the present invention has a rectangular parallelepiped shape as shown in FIGS. 2 and 3, and a yoke 1 having a cylindrical outer wall portion 11 as shown in FIGS. A cylindrical lens holding member 2 capable of holding a lens body (not shown), a coil 3 wound around the lens holding member 2, a pair of flat magnets 5, and the lens holding member 2 And an urging member 6 that supports the movable member 6 so as to be movable in the optical axis direction JD (Z direction shown in FIG. 1). In the first embodiment of the present invention, the biasing member 6 that supports the lens holding member 2 includes an upper leaf spring 16 whose one side (inner part) is fixed to the upper part of the lens holding member 2, and the lens holding member. 2, a lower leaf spring 26 </ b> A and a lower leaf spring 26 </ b> B whose one side (inner portion) is fixed. In addition, in the lens driving device 101 according to the first embodiment of the present invention, as shown in FIG. 4, it is arranged above the urging member 6 (specifically, the upper leaf spring 16) (in the Z1 direction shown in FIG. 4). A spacer member 4 provided, a base member 8 disposed below the lens holding member 2 (Z2 direction shown in FIG. 4) and engaged with the yoke 1, and a terminal 9 for electrical connection with an external device. And have.

  The lens driving device 101 is mounted on a substrate (not shown) on which a lens body (not shown) is held by the lens holding member 2 and an imaging element is mounted. Then, the lens driving device 101 moves the lens held in the lens body with respect to the image sensor by the electromagnetic force generated by energizing the coil 3 from the power source from the substrate in the optical axis direction JD (Z direction shown in FIG. 2). In order to adjust the focal length by driving the lens, the lens holding member 2 is moved along the optical axis direction JD. In other words, the lens driving device 101 moves the lens held by the lens body in the direction away from the imaging element to enable macro photography, and moves the lens held by the lens body in the direction of approaching to infinity. Shooting is possible.

  Next, each component will be described in detail. First, the yoke 1 of the lens driving device 101 will be described. 5A is an upper perspective view of the yoke 1 viewed from the Z1 side shown in FIG. 1, and FIG. 5B is a lower perspective view of the yoke 1 viewed from the Z2 side shown in FIG. FIG. 6 is a diagram for explaining the yoke 1, the coil 3, and the magnet 5. In the bottom view shown in FIG. 3B, the lens holding member 2 and a part of the urging member 6 (specifically, the lower It is the bottom view which omitted the side leaf spring 26A and the lower leaf spring 26B), the base member 8, and the terminal 9.

  The yoke 1 of the lens driving device 101 is fabricated by bending, drawing, etc. using a soft magnetic metal plate such as iron, and is formed in a rectangular box shape as shown in FIG. ing. Further, the yoke 1 includes a rectangular and cylindrical outer wall portion 11, a flat plate-like upper plate portion 31 provided continuously with the upper end of the outer wall portion 11 (Z1 side shown in FIG. 5), and an upper plate portion 31. A plurality of (two) inner wall portions 51 that extend downward (in the Z2 direction shown in FIG. 5) from a part of the opening 1k and are located inside the outer wall portion 11. Yes. As shown in FIG. 4, the yoke 1 covers the lens holding member 2, the coil 3, the spacer member 4, the magnet 5, and the biasing member 6 (the upper leaf spring 16, the lower leaf spring 26A, and the lower leaf spring 26B). Thus, these members are accommodated and engaged with the base member 8 and integrated with the base member 8 as shown in FIG.

  Further, as shown in FIG. 6, the outer wall portion 11 of the yoke 1 includes a pair of first flat plate portions 11a facing each other on the inner wall portion 51 side and a pair of second flat plates orthogonal to the first flat plate portion 11a and facing each other. And a flat plate portion 11b. Further, as shown in FIG. 5, the upper plate portion 31 on the first flat plate portion 11a side has a function of connecting the first flat plate portion 11a (outer wall portion 11) and the inner wall portion 51 with an interval therebetween. .

  Further, as shown in FIG. 6, the inner wall 51 of the yoke 1 is composed of a first inner wall 51 </ b> A and a second inner wall 51 </ b> B that are formed in opposite positions in parallel with the first flat plate portion 11 a. Has been. The coil 3 and the magnet 5 are disposed between the inner wall portion 51 (first inner wall portion 51A and second inner wall portion 51B) and the outer wall portion 11 (first flat plate portion 11a). In other words, the inner wall 51 (first inner wall 51A and second inner wall 51B) faces the magnet 5 in parallel with each other via the coil 3 (extended portion 13 described later).

  Next, the lens holding member 2 of the lens driving device 101 will be described. FIG. 7 is a diagram for explaining the lens holding member 2. FIG. 7 (a) is an upper perspective view of the lens holding member 2 as viewed from the Z1 side shown in FIG. 1, and FIG. 3 is an upper perspective view showing a state in which a coil 3 is wound around a lens holding member 2. FIG. FIG. 8A is a perspective view in which the yoke 1 and the spacer member 4 are omitted in the perspective view shown in FIG. 2A, and FIG. 8B is the perspective view shown in FIG. FIG. 6 is a top view in which a part of the biasing member 6 (specifically, the upper leaf spring 16) is omitted.

  The lens holding member 2 of the lens driving device 101 is made of a synthetic resin such as liquid crystal polymer (LCP) and is formed in a cylindrical shape as shown in FIG. The cylinder part 12 (refer FIG.8 (b)) which has this, and the collar part 32 which protruded to the radial direction outer side from the outer peripheral surface of the lower end (Z2 side shown in FIG. 4) of the cylinder part 12. As shown in FIG. 4, the lens holding member 2 is arranged inside the outer wall portion 11 of the yoke 1 and is arranged above the base member 8 (Z1 direction shown in FIG. 1).

  As shown in FIG. 7, a female screw portion 12 n is formed on the inner peripheral surface of the cylindrical portion 12 of the lens holding member 2, and a lens body (not shown) is mounted and held on the female screw portion 12 n.

  As shown in FIG. 4 and FIG. 7A, a coil support portion 12j that supports the coil 3 from the inside is provided on the outer peripheral surface of the cylindrical portion 12 of the lens holding member 2, and this coil support portion 12j As shown in FIG. 7 (a), two are provided at each of four locations (FIG. 7 (a) shows two locations in the X1 direction and the Y2 direction). When the lens driving device 101 is assembled, the side of the coil support portion 12j on the side (X direction side shown in FIG. 7) facing the magnet 5 across the coil 3 (Y direction shown in FIG. 7). The inner wall 51 (the first inner wall 51A and the second inner wall 51B) of the yoke 1 is disposed in the space sandwiched between the lens holding member 2 and the coil 3 on the side (see FIG. 4A). ).

  On one end side (upper end side) of the coil support portion 12j, as shown in FIG. 7, a flange portion 12h is formed so as to face the flange portion 32 and protrude radially outward. As shown in FIG. 7, two pedestal portions 12d are formed on the outer peripheral surface of the cylindrical portion 12 further above the flange portion 12h so as to face each other (Y direction shown in FIG. 7). When the lens driving device 101 is assembled, as shown in FIG. 8A, the two opposing pedestal portions 12d and the upper leaf spring 16 are fixed with an adhesive.

  Next, the coil 3 of the lens driving device 101 will be described. FIG. 9 is a diagram for explaining the coil 3 and is an enlarged bottom view of a P portion shown in FIG. 6.

  The coil 3 of the lens driving device 101 is made of a metal wire (conductive wire) having an insulating coating (coating) on the outer periphery, and has a substantially rectangular ring shape as shown in FIG. As shown in b), it is wound around the cylindrical portion 12 of the lens holding member 2. As shown in FIG. 4, the coil 3 is supported from the inside by a coil support portion 12j (see FIG. 4B), and a part of the coil 3 is sandwiched between the flange portion 12h and the flange portion 32. In this way, it is fixed to the upper surface of the collar portion 32. That is, the coil 3 is held by the lens holding member 2 at a portion facing the position between the first inner wall portion 51A and the second inner wall portion 51B of the yoke 1. In FIG. 1, FIG. 6, FIG. 7 (b) and FIG. 8, the surface is sometimes covered with an insulating member, and the detailed winding state of the conducting wire is omitted. Although not shown in detail, both ends of the metal wire forming the coil 3 are electrically conductive, and each of the coil end portions 93 (see FIG. 1) includes two lower leaf springs. (26A, 26B) are electrically connected.

  Further, as shown in FIG. 6, the coil 3 formed in a rectangular annular shape extends along the extending direction LD (the Y direction shown in FIG. 6) facing the magnet 5 and extending the magnet 5. A pair of extending portions 13 and a pair of connecting portions 33 that connect ends of the extending portions 13 are configured. Since the magnet 5 described later extends long in the Y direction shown in FIG. 6, the extending part 13 extends along the longitudinal direction of the magnet 5.

  First, as shown in FIG. 6, the extension portion 13 of the coil 3 includes a parallel portion 13 p located at the center portion of the extension portion 13, and a minute first angle AG <b> 1 located on both sides of the parallel portion 13 p (FIG. 9). The first inclined portion 13s is formed. The boundary portion BD where the angle between the parallel portion 13p and the first inclined portion 13s changes is in the vicinity of the end portion of the yoke 1 on the side where the first inner wall portion 51A and the second inner wall portion 51B face each other ( 9) and provided outside the coil support 12j (see FIG. 7B).

  The parallel portion 13p of the extending portion 13 is parallel to the opposing magnet 5 and the first flat plate portion 11a, and is supported by the coil support portion 12j of the lens holding member 2. Thereby, the parallelism of the parallel part 13p and the magnet 5 can be maintained reliably. In addition, since the boundary portion BD between the parallel portion 13p and the first inclined portion 13s where the angle of the extending portion 13 changes is provided outside the coil supporting portion 12j, the coil supporting portion 12j is extended to the extending portion 13. Therefore, the extending portion 13 having a desired shape (angle) can be formed.

  As described above, the first inclined portion 13s of the extending portion 13 has a minute first angle AG1 (see FIG. 9) so as to move away from the magnet 5 toward the end of the extending portion 13. Is formed. The minute first angle AG1 is 1 ° in the first embodiment of the present invention, and is 0.5 ° or more and 5 ° or less from the arrangement position of the extending portion 13 and the inner wall portion 51. Is preferred. By providing the minute first angle AG1 in the extending portion 13, it is possible to suppress a problem that if a wire is wound so that the coil 3 is rectangular without providing an angle, a bulge occurs in a long dimension portion. can do. This makes it possible to form the extended portion 13 closer to a straight line, compared with the case where the extended portion 13 does not swell and become a straight line without providing a minute angle, and the extended portion 13, the magnet 5, and the extended portion 13 can be formed. The inner wall portion 51 can be substantially parallel to the entire extension portion 13. Note that, as described above, since the first angle AG1 is a minute angle from 0.5 ° to 5 °, it can be said that the first angle AG1 is in a substantially parallel state over the entire area of the extending portion 13.

  Next, as shown in FIG. 6, the connecting portion 33 of the coil 3 includes a connecting central portion 33 c located at the central portion of the connecting portion 33, second inclined portions 33 s located on both sides of the connecting central portion 33 c, 2 corner part 33r which connects 33s and the edge part of the extension part 13 is comprised. The two connecting portions 33 are provided so as to directly face the second flat plate portion 11b of the yoke 1, respectively.

  The connection center portion 33 c of the connection portion 33 is parallel to the opposing second flat plate portion 11 b and is supported by the lens holding member 2. Moreover, the connection center part 33c parallel to the 2nd flat plate part 11b is orthogonal to the parallel part 13p parallel to the 1st flat plate part 11a. Moreover, the coil end part 93 is pulled out from the connection center part 33c.

  The second inclined portion 33 s of the connecting portion 33 is formed with a second angle AG <b> 2 (see FIG. 9) so as to move away from the second flat plate portion 11 b toward the extending portion 13 side. The second angle AG2 is set larger than the first angle AG1 of the first inclined portion 13s. By providing the second angle AG2 in the connecting portion 33, even if a conducting wire with a slight waist is wound so that the coil 3 has a rectangular shape, the extension portion 13 is suppressed from bulging outward, and the extension portion 13 is extended. The coil 3 can be formed in a rectangular shape with less influence on the existing portion 13.

  Furthermore, in the first embodiment of the present invention, no flat permanent magnet is disposed between the connecting portion 33 of the coil 3 and the second flat plate portion 11b of the yoke 1. For this reason, the second angle AG2 of the connecting portion 33 is made larger than the first angle AG1 of the extending portion 13 so that the shape of the coil 3 can be reduced, and the outer size of the lens driving device 101 can be increased. Can be suppressed. In the first embodiment of the present invention, the second angle AG2 is 13 °, which is larger than 1 ° of the first angle AG1, but is arbitrary in consideration of the relationship between the outer size and the position where the coil 3 is disposed. The angle is not limited to this angle, and is preferably 5 ° or more and 20 ° or less.

  Next, the spacer member 4 of the lens driving device 101 will be described. The spacer member 4 of the lens driving device 101 is made of a synthetic resin such as polybutylene terephthalate (PBT) and is formed in a frame shape having a rectangular opening 4k at the center as shown in FIG. ing. The spacer member 4 is disposed above the upper leaf spring 16 (the biasing member 6) as shown in FIG. 4, and the upper plate between the spacer member 4 and the magnet 5 as shown in FIG. The spring 16 is clamped.

  Next, the magnet 5 of the lens driving device 101 will be described. The magnet 5 of the lens driving device 101 uses, for example, a samarium cobalt magnet and has a rectangular and flat shape as shown in FIG. 1 and faces the outside of the coil 3 as shown in FIG. Two are arranged. As shown in FIG. 6, the magnet 5 is fixed to the inner surface of the first flat plate portion 11 a by using an adhesive or the like along the first flat plate portion 11 a of the outer wall portion 11 of the yoke 1. At that time, the surface in the plate thickness direction (X direction shown in FIG. 6) is brought into contact with the inner surface of the first flat plate portion 11a so that the extending direction LD of the magnet 5 is along the first flat plate portion 11a. Deploy. As a result, the extending direction LD which is also the longitudinal direction of the magnet 5 becomes a direction orthogonal to the optical axis direction JD (the direction penetrating the paper surface in FIG. 6). The direction in which the magnets 5 are applied is the plate thickness direction, and the two magnets 5 are arranged so that the opposing surfaces of the two magnets 5 have the same magnetic pole.

  Further, as shown in FIG. 6, the magnet 5 has a dimension in the extending direction LD of the magnet 5 (the length dimension of the magnet 5) that is the length dimension of the extending portion 13 of the coil 3 (the direction in which the current of the coil 3 flows). The dimension is larger than At the same time, the magnet 5 has a dimension in the extending direction LD in which the first inner wall 51A and the second inner wall 51B are disposed in the extending direction LD of the magnet 5 (one of the first inner walls 51A). It is formed larger than the dimension between the end portion on the connecting portion 33 side and the end portion on the other connecting portion 33 side of the second inner wall portion 51B.

  As described above, the outer wall portion 11 (first flat plate portion 11a) of the yoke 1, the magnet 5, the coil 3 (extension portion 13), and the inner wall portion 51 (first inner wall portion 51A and second inner wall portion) of the yoke 1. 51B) and the upper plate portion 31 are provided, a magnetic field is formed such that the magnetic flux generated from the magnet 5 returns to the magnet 5 again through the outer wall portion 11, the upper plate portion 31, and the inner wall portion 51. Thereby, a parallel magnetic field can be formed between the flat magnet 5 and the inner wall 51 (the first inner wall 51A and the second inner wall 51B), and the permanent magnet 918 and the back yoke can be formed as in the conventional example. Magnetic flux between 926 does not leak. For this reason, a magnetic field in which the magnetic flux is confined can be created, and the extending portion 13 of the coil 3 can reliably receive the magnetic flux. Thereby, the thrust by the magnetic circuit made of the yoke 1, the coil 3, and the magnet 5 can be increased.

  Furthermore, since the central portion (specifically, the parallel portion 13p) of the extending portion 13 located between the first inner wall portion 51A and the second inner wall portion 51B is held by the lens holding member 2, the inner wall portion 51 and The extending portion 13 (the first inclined portion 13 s in the first embodiment of the present invention) of the coil 3 can be arranged in a well-balanced position at an appropriate position between the magnet 5. For this reason, variations in thrust characteristics and the like are reduced.

  Moreover, in 1st Embodiment of this invention, while the dimension in the extending direction LD of the magnet 5 is larger than the length dimension of the extension part 13, 1st inner wall part 51A and 2nd inner wall part 51B are arrange | positioned. Since it is larger than the size of the region, the magnetic flux generated from the flat magnet 5 can be reliably received by the inner wall 51 (the first inner wall 51A and the second inner wall 51B). For this reason, the extension part 13 of the coil 3 located between the magnet 5 and the inner wall part 51 (1st inner wall part 51A and 2nd inner wall part 51B) can receive magnetic flux reliably. As a result, the thrust can be reliably increased.

  Next, the urging member 6 of the lens driving device 101 will be described. FIG. 10 is a diagram for explaining the urging member 6. FIG. 10 (a) is a top view of the upper leaf spring 16 shown in FIG. 1 as viewed from the Z1 side, and FIG. 2 is a top view of a lower leaf spring 26A and a lower leaf spring 26B shown in FIG. FIG. 11 is a perspective view showing a state in which the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B are placed on the base member 8.

  The urging member 6 of the lens driving device 101 is made of a metal plate made of a copper alloy as a main material, and as shown in FIG. 3A, from the inner peripheral surface of the cylindrical portion 12 of the lens holding member 2. 4 has an opening having a large diameter, and as shown in FIG. 4, an upper leaf spring 16 disposed between the lens holding member 2 and the spacer member 4, and between the lens holding member 2 and the base member 8. The lower plate spring 26A and the lower plate spring 26B are arranged. Then, each of the urging members 6 (upper leaf spring 16, lower leaf spring 26A, lower leaf spring 26B) is fixed to the lens holding member 2, and the lens holding member 2 is in the optical axis direction JD (Z direction shown in FIG. 4). The lens holding member 2 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 (two leaf springs) are electrically connected to the coil 3 and are also used as power feeding members to the coil 3.

  First, as shown in FIG. 10A, the upper leaf spring 16 of the urging member 6 has a substantially rectangular shape, and is provided with two first portions that are provided facing each other and fixed to the lens holding member 2. 16a, two second portions 16b provided opposite to each other and fixed between the spacer member 4 and the magnet 5, a first portion 16a on one side (inner side), and a second portion on the other side (outer side). It has four elastic arm portions 16g positioned between the portions 16b and a crosspiece portion 16r that connects the two second portions 16b.

  When the upper leaf spring 16 is incorporated into the lens driving device 101, the first portion 16a is placed on the pedestal portion 12d of the lens holding member 2 as shown in FIG. The one side of the upper leaf spring 16 is fixed to the lens holding member 2 by fixing the 16a and the pedestal portion 12d with an adhesive. As shown in FIG. 4A, the second portion 16b is in contact with the upper surface portion 5u of the magnet 5 and is sandwiched between the magnet 5 and the upper plate portion 31 of the yoke 1 via the spacer member 4. Has been. The other side of the upper leaf spring 16 is fixed to the fixed side members (the yoke 1, the spacer member 4, the magnet 5 and the base member 8).

  Thereby, since the 2nd part 16b connected with the elastic arm part 16g is clamped between the yoke 1 and the magnet 5, the base of the elastic arm part 16g can be fixed without rattling, and an upper leaf | plate spring can be fixed. 16 can appropriately bias the lens holding member 2 in the optical axis direction JD. Thereby, the posture of the lens holding member 2 is stabilized, and the performance of the lens driving device 101 can be improved.

  Further, as shown in FIG. 10A, the upper leaf spring 16 has a substantially line-symmetric shape, and is a lens holding member that is a movable member at two equal positions of the first portion 16a. 2 and fixed to the member on the fixed side at two equal positions of the second portion 16b. As a result, the upper leaf spring 16 can support the lens holding member 2 in a well-balanced air, and the posture of the lens holding member 2 can be reliably stabilized.

  Next, as shown in FIG. 10B, the lower plate springs (26 </ b> A, 26 </ b> B) of the urging member 6 have semicircular inner shapes and are engaged with the lens holding member 2. Four third parts 26c, four fourth parts 26d engaged with the base member 8 (see FIG. 11), and four parts located between the third part 26c and the fourth part 26d. An elastic arm portion 26g, two first connecting portions 26p that connect two third portions 26c, and two second connecting portions 26q that connect two fourth portions 26d are configured. .

  When the lower leaf springs (26A, 26B) are incorporated into the lens driving device 101, the four convex portions provided below the collar portion 32 of the lens holding member 2 (not shown) are shown in FIG. The lower leaf springs (26A, 26B) shown in (b) are inserted and fitted into the through holes 26k provided in the third portion 26c. Accordingly, one side (inside) of the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B is positioned on the lens holding member 2 and is fixed to the lens holding member 2. At this time, the convex portions of the lens holding member 2 are heat caulked to more reliably fix the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B to the lens holding member 2.

  On the other hand, as shown in FIG. 11, six through-holes 26m (see FIG. 10B) provided in the fourth portion 26d of the lower leaf springs (26A, 26B) are formed on the upper surface of the base member 8 described later. The provided protruding portion 8t is inserted and fitted. Accordingly, the other side (outer side) of the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B is positioned on the base member 8 and fixed to the base member 8.

  Further, as shown in FIG. 10B, the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B are configured in a substantially line-symmetric shape, and the four portions of the third portion 26 c with respect to the lens holding member 2. In addition to being fixed at an equal position, the base member 8 is fixed at four equal positions of the fourth portion 26d. Thus, the lower leaf springs (26A, 26B) can support the lens holding member 2 in a well-balanced air, and the posture of the lens holding member 2 can be reliably stabilized. Accordingly, the biasing member 6 (upper leaf spring 16, lower leaf spring 26A and lower leaf spring 26B) configured as described above supports the lens holding member 2 so as to be stably movable in the optical axis direction JD. Yes.

  Finally, the base member 8 and the terminal 9 of the lens driving device 101 will be described. First, the base member 8 of the lens driving device 101 is manufactured by injection molding using a synthetic resin such as liquid crystal polymer (LCP), and has a rectangular plate shape as shown in FIG. In the center, a circular and concave opening 8k and a rectangular opening 8m made of a through hole are formed. Further, on the upper surface of the base member 8, six projecting portions 8t projecting upward are provided at the four corners. As described above, the protruding portion 8t is inserted into the through hole 26m (see FIG. 10B) provided in the fourth portion 26d of the lower leaf spring (26A, 26B), and the protruding portion 8t. And the through hole 26m are fitted. At this time, heat caulking is applied to the projecting portion 8 t of the base member 8, and the lower leaf spring 26 </ b> A and the lower leaf spring 26 </ b> B are more securely fixed to the base member 8.

  In addition, as shown in FIG. 4, 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 embedded in the base member 8 by insert molding, A part of the connection member 57 is exposed at the four corners of the yoke 1 as shown in FIG. After the inner surface of the outer wall portion 11 of the yoke 1 and the outer peripheral side surface of the base member 8 are positioned and positioned, four joints between the connecting member 57 provided on the base member 8 and the four corners of the yoke 1 are welded. The yoke 1 is fixed to the base member 8.

  Next, the terminal 9 of the lens driving device 101 is produced by subjecting a metal plate made of copper, iron, or an alloy containing them as a main component to a punching process, a bending process, or the like. Then, it is insert-molded and embedded in the base member 8 (see FIG. 4). Each of the two electrically insulated terminals 9 (terminal 9A and terminal 9B) is electrically connected to a substrate on which an imaging element (not shown) is mounted, and power can be supplied from these two terminals 9. It is like that.

  One terminal 9A of the terminal 9 is electrically connected to the lower leaf spring 26A, and the other terminal 9B of the terminal 9 is electrically connected to the lower leaf spring 26B. A current can flow from the terminal 9B to the coil 3 via the lower leaf spring 26A and the lower leaf spring 26B.

  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 annular coil 3 wound around the lens holding member 2 faces the magnet 5 and extends along a direction orthogonal to the optical axis direction JD. A first portion that has an existing portion 13, and the inner wall portion 51 of the yoke 1 faces the magnet 5 in a parallel state via the extending portion 13 at a position spaced apart in the extending direction LD of the extending portion 13. A configuration having an inner wall portion 51A and a second inner wall portion 51B, in which the extending portion 13 of the coil 3 is held by the lens holding member 2 at a portion corresponding to between the first inner wall portion 51A and the second inner wall portion 51B. It was. For this reason, a parallel magnetic field can be formed between the flat magnet 5 and the inner wall 51 (the first inner wall 51A and the second inner wall 51B). For this reason, since the magnetic flux between the permanent magnet 918 and the back yoke 926 does not leak as in the conventional example, a magnetic field in which the magnetic flux is confined can be created, and the extending portion 13 of the coil 3 can reliably generate the magnetic flux. Can receive. Thereby, the thrust by the magnetic circuit made of the yoke 1, the coil 3, and the magnet 5 can be increased.

  Moreover, since the dimension in the extending direction LD of the magnet 5 is larger than the length dimension of the extending part 13 and larger than the dimension of the region in which the first inner wall part 51A and the second inner wall part 51B are disposed, The magnetic flux generated from the magnet 5 can be reliably received by the inner wall 51 (the first inner wall 51A and the second inner wall 51B). For this reason, the extension part 13 of the coil 3 located between the magnet 5 and the inner wall part 51 (1st inner wall part 51A and 2nd inner wall part 51B) can receive magnetic flux reliably. As a result, the thrust can be reliably increased.

  In addition, when the conductive wire is wound so that the coil 3 has a rectangular shape, the long dimension portion bulges, but the extended portion 13 of the long dimension portion extends from the parallel portion 13p of the central portion to the end portions on both sides. Since the first inclined portion 13s formed with the minute first angle AG1 so as to move away from the magnet 5 as it goes is provided, the swelling can be suppressed. For this reason, compared with the case where it does not provide a minute angle and does not swell and become a straight line, the portion of the extended portion 13 can be formed closer to a straight line, and the extended portion 13, the magnet 5, and the extended portion 13 The inner wall portion 51 can be made substantially parallel across the entire extension portion 13. Accordingly, it is possible to provide the lens driving device 101 in which the distance between the coil 3 and the magnet 5 and the inner wall portion 51 is stable and the characteristics are less varied.

  Moreover, since the parallel part 13p of the extending part 13 parallel to the magnet 5 is supported by the coil support part 12j of the lens holding member 2, the parallelism between the magnet 5 and the parallel part 13p can be reliably maintained. In addition, since the boundary portion BD between the parallel portion 13p and the first inclined portion 13s where the angle of the extending portion 13 changes is provided outside the coil supporting portion 12j, the coil supporting portion 12j is extended to the extending portion 13. Therefore, the extending portion 13 having a desired shape can be formed. Accordingly, it is possible to provide the lens driving device 101 in which the distance between the coil 3 and the magnet 5 and the inner wall portion 51 is more stable and the characteristics are less varied.

  Further, since the first angle AG1 is a minute angle of 0.5 ° or more and 5 ° or less, the magnet 5, the extending portion 13 and the inner wall portion 51 can be arranged in a desired state. Accordingly, it is possible to provide the lens driving device 101 in which the distance between the coil 3 and the magnet 5 and the inner wall portion 51 is further stabilized and the characteristics are less varied.

  In addition, the connecting portions 33 that connect the ends of the extending portions 13 and face each other are formed on both sides of the connecting central portion 33c and are separated from the second flat plate portion 11b toward the extending portions 13 by a second angle. The second inclined portion 33s formed with AG2 is provided, and the second angle AG2 is set larger than the first angle AG1. Even if the conductive wire is wound so that the coil 3 has a rectangular shape, the extended portion 13 is difficult to bulge outward, and the coil 3 can be formed in a rectangular shape with less influence on the extended portion 13. . Accordingly, it is possible to provide the lens driving device 101 in which the distance between the coil 3 and the magnet 5 and the inner wall portion 51 is further stabilized and the characteristics are less varied.

  Further, since the second portion 16b connected to the elastic arm portion 16g is sandwiched between the yoke 1 and the magnet 5, the base of the elastic arm portion 16g can be fixed without rattling, and the upper leaf spring 16 can be fixed. Thus, the lens holding member 2 can be appropriately biased in the optical axis direction JD. Thereby, the posture of the lens holding member 2 is stabilized, and the performance of the lens driving device 101 can be improved.

  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>
In the said 1st Embodiment, although it was set as the structure which provides the coil support part 12j 2 each at four places, it is not restricted to this. For example, the configuration may be such that one is provided at each of the four locations (Modification 1), or, for example, it may be configured only at two locations on the side facing the extending portion 13 (Modification 2).

<Modification 3>
In the said 1st Embodiment, although it was set as the structure which provided the 2nd inclination part 33s in the connection part 33 suitably, you may comprise by the connection center part 33c and the corner part 33r.

<Modification 4>
In the first embodiment, the spacer member 4 is used to securely fix the second portion 16b of the upper leaf spring 16 so as to be sandwiched between the spacer member 4 and the upper surface portion 5u of the magnet 5. The structure which does not use the spacer member 4 may be sufficient. At that time, the second portion 16b is directly sandwiched and fixed between the upper surface portion 5u of the magnet 5 and the upper plate portion 31 of the yoke 1.

  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 1 Yoke 11 Outer wall part 11a 1st flat plate part 11b 2nd flat plate part 31 Upper plate part 51 Inner wall part 51A 1st inner wall part 51B 2nd inner wall part 2 Lens holding member 12j Coil support part 3 Coil 13 Extension part 13p Parallel part 13s 1st inclination part 33 connection part 33c connection center part 33s 2nd inclination part 5 magnet 5u upper surface part 6 biasing member 16 upper leaf spring 16a 1st part 16b 2nd part 16g elastic arm part 101 lens drive device AG1 1st angle AG2 Second angle BD Boundary JD Optical axis direction LD Extension direction

Claims (7)

A rectangular yoke having a cylindrical outer wall portion having a pair of first flat plate portions facing each other, and an upper plate portion provided at one end of the outer wall portion and having an opening formed therein;
A cylindrical lens holding member disposed inside the outer wall portion of the yoke and capable of holding a lens body;
An annular coil wound around the lens holding member;
A pair of flat magnets that are respectively fixed to the inner surface of the first flat plate portion and extend in a direction perpendicular to the optical axis direction along the first flat plate portion;
An urging member that supports the lens holding member so as to be movable in the optical axis direction;
The coil has an extending portion that extends along the extending direction of the magnet so as to face the magnet.
The extension part is located at a central part of the extension part and parallel to the magnet, and is located on both sides of the parallel part and away from the magnet toward the end of the extension part. And a first inclined portion formed with a first angle of not less than 0.5 ° and not more than 5 °. The outer wall portion has a pair of second flat plate portions orthogonal to the first flat plate portion and facing each other,
The coil is provided with a connecting portion that connects the ends of the extending portion,
The connecting portion is located at a central portion of the connecting portion and parallel to the second flat plate portion, and is located at both end portions of the connecting portion and toward the extending portion side. The lens driving device according to claim 1, further comprising a second inclined portion formed so as to be separated from the flat plate portion.   3. The lens driving device according to claim 2, wherein a second angle formed by the connection center portion and the second inclined portion is set to be larger than the first angle.   The lens holding member includes a coil support part that supports the parallel part, and the coil support part includes a flange part that protrudes outside the lens holding member, and a flange part that faces the flange part in the optical axis direction. 4. The lens driving device according to claim 1, wherein the parallel portion is supported between the flange portion and the flange portion. 5.   The lens driving device according to claim 4, wherein a boundary portion between the parallel portion and the first inclined portion is provided outside the coil support portion.   6. The lens driving device according to claim 1, wherein a dimension of the magnet in the extending direction is larger than a length dimension of the extending part. The biasing member has an upper leaf spring whose one side is fixed to the upper part of the lens holding member,
The upper leaf spring includes a first portion fixed to the lens holding member, a second portion provided on the other side, an elastic arm portion positioned between the first portion and the second portion, Have
The lens drive according to any one of claims 1 to 6, wherein the second portion is sandwiched and fixed between an upper surface portion of the magnet and the upper plate portion of the yoke. apparatus.

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