JP5939802B2 - Lens driving device and method of manufacturing lens driving device - Google Patents

Description

The present invention relates to a lens driving device mounted on a relatively small camera used in a mobile phone or the like. The present invention also relates to a method for manufacturing such a lens driving device.

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a moving body that holds the lens and moves in the optical axis direction, and a support that holds the moving body so as to be movable in the optical axis direction A lens driving device including a body, a driving coil and a driving magnet for driving the moving body in the optical axis direction is known (see, for example, Patent Document 1). In the lens driving device described in Patent Document 1, a driving coil is attached to a moving body, and a driving magnet is attached to a support.

  Further, in the lens driving device described in Patent Document 1, the moving body and the support body are connected by leaf springs disposed on both ends of the moving body in the optical axis direction. Of the leaf springs arranged on both ends of the moving body in the optical axis direction, the leaf spring arranged on the subject side is fixed to the annular first fixing portion fixed to the moving body and the support 4. A plurality of second fixing portions, and four arm portions connecting the first fixing portion and the second fixing portion. An annular magnetic member is disposed between the portion of the moving body where the first fixing portion is fixed and the first fixing portion. The leaf spring arranged on the subject side is fixed to the moving body and the support body with its arm portion bent, and the urging force of the leaf spring causes the moving body to move in the optical axis direction. It is biased toward the reference position.

  In the lens driving device described in Patent Document 1, the magnetic member disposed between the first fixed portion and the first fixed portion of the movable body, and the driving member fixed to the support body. A magnetic attractive force acts between the magnet and the magnet, and in addition to the biasing force of the leaf spring arranged on the subject side, this magnetic attractive force also causes the moving body to be at the reference position in the optical axis direction. The moving body is energized toward it.

JP 2008-275952 A

  As described above, in the lens driving device described in Patent Document 1, the leaf spring is fixed to the moving body and the support body in a state where the arm portion of the leaf spring disposed on the subject side is bent. The moving body is biased toward the reference position of the moving body in the axial direction. Here, when the spring characteristics of the leaf springs arranged on the subject side vary and the urging force of the moving body due to the leaf springs varies, the lens driving device described in Patent Document 1 uses the first fixed portion of the moving body. Since the magnetic member is disposed between the portion to which the moving body is fixed and the first fixing portion, the biasing force of the moving body by the leaf spring is adjusted by adjusting the thickness of the magnetic member, It is possible to suppress variation in urging force. However, in the lens driving device described in Patent Document 1, if there is no magnetic member, the urging force of the moving body by the leaf spring cannot be adjusted, and as a result, variation in the urging force of the moving body can be suppressed. Can not.

Therefore, the problem of the present invention is that even if the spring characteristics of the spring member connecting the movable body and the fixed body vary, the biasing force of the movable body by the spring member is adjusted with a simple configuration, and the movable member by the spring member is adjusted. An object of the present invention is to provide a lens driving device capable of suppressing variations in urging force. Moreover, the subject of this invention is providing the manufacturing method of this lens drive device.

In order to solve the above problems, a lens driving device of the present invention includes a movable body that holds a lens and is movable in the optical axis direction of the lens, a fixed body that holds the movable body so as to be movable in the optical axis direction, A spring member connecting the body and the fixed body, wherein the spring member includes a movable body fixing portion fixed to the movable body, a fixed body fixing portion fixed to the fixed body, a movable body fixing portion, and a fixed body fixing portion. And a plurality of arms that connect the movable body to the reference position of the movable body in the optical axis direction. The movable body includes a movable-side spring fixing portion to which the movable body fixing portion is fixed. The fixed body includes a fixed-side spring fixing portion to which the fixed-body fixing portion is fixed, and the movable-side spring fixing portion is formed with a movable-side protrusion that protrudes toward the movable body fixing portion and contacts the movable body fixing portion. And an adhesive applied between the movable body fixing portion and the movable side spring fixing portion. Thus the movable-side projection and the movable body fixing portion is bonded and fixed, and / or the fixed-side spring fixing portion, the fixed-side protrusion abuts against the fixed body fixing portion protruding fixing member fixing portion formed Rutotomoni, a fixed side protrusion by the adhesive applied between the fixed body fixing portion and the fixed side spring fixing portion and the fixed body fixing portion is characterized in that it is bonded and fixed.

  In the lens driving device of the present invention, the movable body includes a movable-side spring fixing portion to which a movable body fixing portion of a plate spring that connects the movable body and the fixed body is fixed, and the fixed body is a fixed body fixing portion of the plate spring. Is provided with a fixed spring fixing portion. Further, in the present invention, the movable side protrusion that contacts the movable body fixing portion is formed on the movable side spring fixing portion, or the fixed side protrusion that contacts the fixed body fixing portion is formed on the fixed side spring fixing portion. Has been. Alternatively, the movable side protrusion is formed on the movable side spring fixing part, and the fixed side protrusion is formed on the fixed side spring fixing part.

Therefore, in the present invention, even if the spring characteristics of the spring member vary, the amount of protrusion of the movable side protrusion and / or the fixed side protrusion is adjusted (that is, a part of the movable body and / or the fixed body is used). Thus, it becomes possible to adjust the urging force of the movable body by the spring member. Therefore, in the present invention, the biasing force of the movable body by the spring member is adjusted so that the biasing force of the movable body by the spring member is adjusted even if the magnetic member is not provided as in the lens driving device described in Patent Document 1. Variations can be suppressed. That is, in the present invention, even if the spring characteristics of the spring member connecting the movable body and the fixed body vary, the urging force of the movable body by the spring member can be reduced with a simple configuration using a part of the movable body or the fixed body. By adjusting, it is possible to suppress variation in the urging force of the movable body due to the spring member. In the present invention, the movable side protrusion and the movable body fixing portion are bonded and fixed by an adhesive applied between the movable body fixing portion and the movable side spring fixing portion, or the fixed body fixing portion and The fixed side protrusion and the fixed body fixing portion are bonded and fixed by an adhesive applied between the fixed side spring fixing portion. Alternatively, the movable side protrusion and the movable body fixing portion are bonded and fixed by an adhesive applied between the movable body fixing portion and the movable side spring fixing portion, and the fixed body fixing portion and the fixed side spring fixing portion. The fixed-side protruding portion and the fixed body fixing portion are bonded and fixed by the adhesive applied between the two. Therefore, it is possible to reliably contact the movable protrusion and the movable body fixing portion. Therefore, by adjusting the protrusion amount of the movable protrusion, it is possible to appropriately adjust the amount of bending of the arm, and as a result, it is possible to appropriately adjust the biasing force of the movable body by the spring member. become. Or it becomes possible to make a fixed side projection part and a fixed body fixing | fixed part contact | abut reliably. Therefore, it is possible to appropriately adjust the urging force of the spring member by adjusting the protrusion amount of the fixed-side protrusion.

  In the present invention, the movable side protrusion and / or the fixed side protrusion is preferably formed in a substantially columnar shape. For example, the movable side protrusion and / or the fixed side protrusion is preferably formed in a substantially cylindrical shape. If comprised in this way, the adjustment operation | work of the protrusion amount of a movable side projection part or a fixed side projection part will become easy.

  In the present invention, a plurality of movable side protrusions are formed on the movable side spring fixing part, and each of the plurality of movable side protrusions is a movable side connection part that is a connection part of the movable body fixing part with the arm part. It is preferable that they are arranged so as to abut each other or abut each of the movable side connecting portions. If comprised in this way, the biasing force of a spring member is adjusted to the movable side connection part of the movable body fixing | fixed part which is a connection part with the arm part which generate | occur | produces the biasing force of a spring member, or the vicinity of a movable side connection part Therefore, the movable side protrusion can be brought into contact. Therefore, the adjustment of the urging force of the movable body by the spring member is facilitated as compared with the case where the movable protrusion is in contact with the position away from the movable connecting portion.

  In the present invention, the movable body fixing portion is formed in a substantially annular shape, the movable side spring fixing portion is formed in a substantially annular shape on the outer peripheral side of the movable body, and the movable side protrusion is formed in the movable side spring fixing portion. It is preferable that With this configuration, it is possible to easily position the movable spring fixing portion and the movable body fixing portion in the direction orthogonal to the optical axis direction. As a result, the movable side protrusion and the movable body fixing portion Can be easily positioned.

  In the present invention, a plurality of fixed-side protrusions are formed on the fixed-side spring fixing portion, and each of the plurality of fixed-side protrusions is a fixed-side connecting portion that is a connecting portion of the fixed body fixing portion with the arm portion. It is preferable that they are arranged so as to abut each other or abut each of the fixed side connecting portions. If comprised in this way, the urging | biasing force of a spring member is adjusted to the fixed side connection part of the fixed body fixing | fixed part which is a connection part with the arm part which generate | occur | produces the urging | biasing force of a spring member, or the vicinity of a fixed side connection part For this reason, the fixed-side protruding portion can be brought into contact. Therefore, the biasing force of the spring member can be easily adjusted as compared with the case where the fixed-side protrusion is in contact with the position away from the fixed-side connecting portion.

  In the present invention, the lens driving device is formed so that the shape when viewed from the optical axis direction is a substantially square shape, and the fixed-side spring fixing portion and the fixed body fixing portion are arranged at each of the four corners of the lens driving device. In addition, it is preferable that a fixed-side protrusion is formed on the fixed-side spring fixing portion. With this configuration, the fixed-side protrusions can be arranged at the four corners of the lens driving device capable of securing a relatively wide space. Therefore, a plurality of fixed-side protrusions are formed on the fixed-side spring fixing part. It is possible to form fixed-side protrusions of various shapes.

In the method for manufacturing a lens driving device according to the present invention, the movable side protrusion and / or the fixed side protrusion are crushed by being heated or pressurized, for example. In this case, it is possible to finely adjust the amount of protrusion of the movable-side protrusion and the fixed-side protrusion by heating or pressurizing, and finely adjust the urging force of the movable body by the spring member.

  As described above, in the lens driving device of the present invention, even if the spring characteristics of the spring member connecting the movable body and the fixed body vary, the urging force of the movable body by the spring member is adjusted with a simple configuration, and the spring It is possible to suppress variations in the urging force of the movable body due to the members.

It is a perspective view of the lens drive device concerning an embodiment of the invention. It is sectional drawing of the EE cross section of FIG. It is a disassembled perspective view of the lens drive device shown in FIG. It is a top view of the leaf | plate spring shown in FIG. FIG. 4 is a perspective view showing the spacer shown in FIG. 3 from the non-subject side. FIG. 4 is a perspective view of the sleeve shown in FIG. 3. It is an enlarged view for demonstrating the structure of the F section of FIG. It is a perspective view which shows the spacer concerning other embodiment of this invention from the non-subject side. It is an enlarged view for demonstrating the structure corresponded to the F section of FIG. 2 when the spacer shown in FIG. 8 is used.

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

(Schematic configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of the lens driving device 1 shown in FIG. In the following description, as shown in FIG. 1 and the like, the three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. The X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. Also, the X1 direction side is the “right” side, the X2 direction side is the “left” side, the Y1 direction side is the “front” side, the Y2 direction side is the “rear (back)” side, the Z1 direction side is the “upper” side, The Z2 direction side is the “lower” side.

  The lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone, a drive recorder, a surveillance camera system, or the like, and is formed in a substantially quadrangular prism shape as a whole as shown in FIG. Has been. Specifically, the lens driving device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape. The four side surfaces of the lens driving device 1 are substantially parallel to the left-right direction or the front-rear direction.

  In this embodiment, the Z direction (vertical direction) is substantially coincident with the optical axis direction. In addition, in a camera equipped with the lens driving device 1 of the present embodiment, an imaging element (not shown) is arranged on the lower side, and a subject arranged on the upper side is photographed. That is, in this embodiment, the upper side (Z1 direction side) is the subject side (object side), and the lower side (Z2 direction side) is the anti-subject side (imaging element side, image side).

  As shown in FIGS. 1 and 2, the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in the optical axis direction, and a fixed body that holds the movable body 2 so as to be movable in the optical axis direction. 3 and a drive mechanism 4 for driving the movable body 2 in the optical axis direction. Moreover, the lens drive device 1 includes leaf springs 5 and 6 that connect the movable body 2 and the fixed body 3 as shown in FIGS. That is, the movable body 2 is movably held by the fixed body 3 via the leaf springs 5 and 6. In this embodiment, the leaf spring 5 is disposed on the upper end side of the movable body 2, and the leaf spring 6 is disposed on the lower end side of the movable body 2.

  The movable body 2 includes a sleeve 8 that holds a lens holder 7 to which a plurality of lenses are fixed. The fixed body 3 includes a cover member 10 that constitutes the upper end portion of the side surface of the lens driving device 1, a base member 11 that constitutes the lower end portion of the side surface of the lens driving device 1 and the lower end surface of the lens driving device 1, and a plate And a spacer 12 to which a part of the spring 5 is fixed. A pair of power supply terminals 13 and 14 for supplying a current to a drive coil 20 (described later) that constitutes the drive mechanism 4 are fixed to the base member 11. In addition, illustration of the lens holder 7 is abbreviate | omitted in FIG.

  The lens holder 7 is formed in a substantially cylindrical shape. A plurality of lenses are fixed on the inner peripheral side of the lens holder 7. The sleeve 8 is formed of, for example, a resin material and has a substantially cylindrical shape. Specifically, the sleeve 8 has a substantially cylindrical shape in which the shape of the inner peripheral surface when viewed from the optical axis direction is substantially circular, and the shape of the outer peripheral surface when viewed from the optical axis direction is substantially rectangular. Is formed. The sleeve 8 holds the lens holder 7 on its inner peripheral side. At the lower end of the sleeve 8, a projection 8 a that contacts a later-described reference surface 11 b formed on the base member 11 and determines the reference position of the movable body 2 in the optical axis direction is formed so as to protrude downward. Yes. The protrusions 8a are formed at four locations at a 90 ° pitch with the optical axis L as the center. In addition, a movable body fixing portion 5a, which will be described later, constituting the leaf spring 5 is fixed to the sleeve 8. The configuration of the portion of the sleeve 8 to which the movable body fixing portion 5a is fixed will be described later.

  The cover member 10 is made of a magnetic metal material. Moreover, the cover member 10 is formed in the substantially square cylinder shape with the bottom which has the bottom part 10a and the cylinder part 10b. A through hole 10c is formed at the center of the bottom 10a disposed on the upper side. The cover member 10 covers the outer peripheral side of the movable body 2 and the drive mechanism 4.

  The base member 11 is formed of an insulating resin material. The base member 11 is formed in a block shape having a substantially square shape when viewed from the optical axis direction. The base member 11 is attached to the lower end side of the cover member 10. A through hole 11 a is formed at the center of the base member 11. Further, on the upper surface of the base member 11, a reference surface 11b for determining the reference position of the movable body 2 in the optical axis direction is formed in a planar shape orthogonal to the optical axis direction. The reference surfaces 11b are formed at four locations at a 90 ° pitch with the optical axis L as the center. In this embodiment, when the lower end surface of the protruding portion 8a of the sleeve 8 is in contact with the reference surface 11b, the movable body 2 is at the reference position in the optical axis direction.

  The spacer 12 is formed of, for example, a resin material and is formed in a substantially square flat block shape. The spacer 12 is formed in a frame shape, and a through hole is formed at the center thereof. The spacer 12 is fixed to the lower surface of the bottom 10 a of the cover member 10. A fixed body fixing portion 5b, which will be described later, constituting the leaf spring 5 is fixed to the spacer 12. The configuration of the portion of the spacer 12 to which the fixed body fixing portion 5b is fixed will be described later.

  The leaf spring 5 is formed in a plate shape from a metal material. The leaf spring 5 includes a movable body fixing portion 5a fixed to the upper end side of the sleeve 8, four fixed body fixing portions 5b fixed to the spacer 12, a movable body fixing portion 5a, and a fixed body fixing portion 5b. Are provided with four arm portions 5c. The detailed configuration of the leaf spring 5 will be described later. In addition, the leaf | plate spring 5 of this form is a spring member which connects the movable body 2 and the fixed body 3. FIG.

  The leaf spring 6 is composed of two spring pieces 15 and 16 that are electrically separated from each other. The spring pieces 15 and 16 are formed in a plate shape from a conductive metal material. The spring pieces 15, 16 connect the movable body fixing portion fixed to the lower end side of the sleeve 8, the two fixed body fixing portions fixed to the base member 11, and the movable body fixing portion and the fixed body fixing portion. And two arms. The spring pieces 15 and 16 are electrically connected to an end portion of a driving coil 20 described later that constitutes the driving mechanism 4. The spring pieces 15 and 16 are fixed to the sleeve 8 and the base member 11 so that the thickness direction and the optical axis direction substantially coincide with each other. Further, the spring pieces 15 and 16 are applied to the sleeve 8 and the base member 11 so that the urging force of the movable body 2 by the spring pieces 15 and 16 does not occur when current is not supplied to the drive coil 20 described later. It is fixed.

  The power supply terminals 13 and 14 are made of a conductive metal material. A spring piece 15 is electrically connected to the power supply terminal 13, and a spring piece 16 is electrically connected to the power supply terminal 14. The power supply terminals 13 and 14 are fixed to the front side of the base member 11.

  The drive mechanism 4 includes two drive coils 20 wound around the outer periphery of the sleeve 8 and drive magnets 21 arranged along each of the four side surfaces of the lens drive device 1. The two drive coils 20 are wound around the outer peripheral surface of the sleeve 8 with a predetermined interval in the optical axis direction. In this embodiment, two conductive coils 20 are formed by winding a single conducting wire around the outer peripheral surface of the sleeve 8. The drive magnet 21 is formed in a substantially rectangular plate shape. The driving magnet 21 is fixed to the inner side surface of the cylindrical portion 10 b of the cover member 10 so as to face the outer peripheral surface of the driving coil 20. The cover member 10 of this embodiment fulfills the function of a yoke for forming a magnetic circuit.

(Configuration of leaf spring, sleeve and spacer)
FIG. 4 is a plan view of the leaf spring 5 shown in FIG. FIG. 5 is a perspective view showing the spacer 12 shown in FIG. 3 from the non-subject side. FIG. 6 is a perspective view of the sleeve 8 shown in FIG. FIG. 7 is an enlarged view for explaining the configuration of the F part in FIG. 2.

  As described above, the leaf spring 5 includes the movable body fixing portion 5a, the four fixed body fixing portions 5b, and the four arm portions 5c. The movable body fixing | fixed part 5a is formed in the annular | circular shape. The fixed body fixing | fixed part 5b is formed in the substantially rectangular shape. The four fixed body fixing portions 5b are arranged on the outer peripheral side with respect to the movable body fixing portion 5a. In addition, each of the four fixed body fixing portions 5 b is disposed at each of the four corners of the lens driving device 1. A round hole-like positioning hole 5d for positioning the leaf spring 5 is formed in the fixed body fixing portion 5b so as to penetrate the fixed body fixing portion 5b. The arm portion 5c is formed so that desired spring characteristics of the leaf spring 5 can be obtained. Specifically, the arm portion 5c is formed in a substantially ¼ arc shape.

  As shown in FIG. 4, an arm portion 5c is connected to the fixed body fixing portion 5b arranged at the right front corner on the substantially rear side, so that the fixed body fixing portion 5b arranged at the right front corner is substantially omitted. On the rear side, a fixed side connecting portion 5e that is a connecting portion with the arm portion 5c is formed. An arm portion 5c is connected to the fixed body fixing portion 5b disposed at the right rear corner on the substantially left side thereof, and the arm portion 5c is disposed on the substantially left side of the fixed body fixing portion 5b disposed at the right rear corner. The fixed side connection part 5f which is a connection part is formed. An arm portion 5c is connected to the fixed body fixing portion 5b disposed at the left rear corner at a substantially front side thereof, and the arm portion 5c is disposed at a substantially front side of the fixed body fixing portion 5b disposed at the left rear corner. The fixed side connection part 5g which is a connection part is formed. An arm portion 5c is connected to the fixed body fixing portion 5b disposed at the left front corner, and is connected to the arm portion 5c on the right side of the fixed body fixing portion 5b disposed at the left front corner. The fixed side connection part 5h which is a part is formed.

  Further, the movable side connecting portion 5k, which is a connecting portion of the movable body fixing portion 5a to the arm portion 5c, is located behind the fixed side connecting portion 5e, the left side of the fixed side connecting portion 5f, the front side of the fixed side connecting portion 5g, And it is formed in four places of the right side of the fixed side connection part 5h. Further, the four movable side connecting portions 5k are formed on the movable body fixing portion 5a at a 90 ° pitch with the optical axis L as the center.

  As described above, the spacer 12 is formed in a substantially square flat block shape. In each of the four corners of the spacer 12, spring fixing portions 12 a are formed as fixed side spring fixing portions to which the fixed body fixing portions 5 b of the leaf springs 5 are fixed. The spring fixing portions 12 a are disposed at the four corners of the lens driving device 1. As shown in FIG. 5, a spring fixing surface 12b to which the upper surface of the fixed body fixing portion 5b is fixed is formed on the lower surface side of the spring fixing portion 12a. The spring fixing surface 12b is formed in a planar shape substantially orthogonal to the optical axis direction.

  The upper surface of the fixed body fixing portion 5b is in contact with the spring fixing surface 12b, and the fixed body fixing portion 5b is disposed below the spring fixing surface 12b. Further, a positioning projection 12c inserted into the positioning hole 5d of the fixed body fixing portion 5b is formed on the spring fixing surface 12b so as to protrude downward. The positioning projection 12c is formed in a flat and substantially cylindrical shape. The fixed body fixing portion 5b is fixed to the spring fixing surface 12b. Specifically, the fixed body fixing portion 5b is bonded and fixed to the spring fixing surface 12b.

  On the upper end side of the sleeve 8, a spring fixing portion 8 b is formed as a movable side spring fixing portion to which the movable body fixing portion 5 a of the leaf spring 5 is fixed. The spring fixing portion 8 b is formed on the outer peripheral side of the upper end side portion of the sleeve 8. That is, the spring fixing portion 8 b is formed on the outer peripheral side of the upper end side portion of the movable body 2. The spring fixing portion 8b is formed in a substantially annular shape. The upper surface 8c of the spring fixing portion 8b is formed in a planar shape that is substantially orthogonal to the optical axis direction. The movable body fixing | fixed part 5a is arrange | positioned above the upper surface 8c of the spring fixing | fixed part 8b. Note that, in a predetermined range in the circumferential direction of the sleeve 8, a notch portion 8 d that is notched from the upper end to the lower end side of the sleeve 8 is formed, and by this notch portion 8 d, the circle of the sleeve 8 is formed. A predetermined range of the spring fixing portion 8b in the circumferential direction is also cut away.

  On the upper surface 8c of the spring fixing portion 8b, a protrusion 8e is formed as a movable protrusion protruding upward. That is, the upper surface 8c is formed with a protruding portion 8e that protrudes toward the movable body fixing portion 5a. The protrusion 8e is formed in a substantially column shape. Specifically, the protrusion 8e is formed in a substantially cylindrical shape. Further, the protrusions 8e are formed at four locations at a 90 ° pitch with the optical axis L as the center.

  The movable body fixing portion 5a is fixed to the upper surface 8c side of the spring fixing portion 8b. Specifically, the movable body fixing portion 5a is fixed to the protruding portion 8e in a state where the upper end (tip) of the protruding portion 8e is in contact with the lower surface thereof. The movable body fixing portion 5a is adhesively fixed to the protrusion 8e by an adhesive applied between the lower surface of the movable body fixing portion 5a that contacts the upper end of the protrusion 8e and the upper surface 8c of the spring fixing portion 8b. ing. Each of the upper ends of the four projecting portions 8e is in contact with the lower surface of each of the four movable side connecting portions 5k of the movable body fixing portion 5a (see the broken line in FIG. 4).

  As shown in FIG. 7, the spring fixing surface 12b of the spacer 12 is always disposed below the upper end of the protrusion 8e in the movable range of the movable body 2, and the leaf spring 5 has the arm portion 5c. It is fixed to the sleeve 8 and the spacer 12 while being always bent. Therefore, the movable body 2 is always urged downward by the urging force of the leaf spring 5. That is, the movable body 2 has the lower end surface of the protrusion 8 a of the sleeve 8 on the reference surface 11 b of the base member 11 due to the urging force of the leaf spring 5 even when no current is supplied to the drive coil 20. The movable body 2 that is in contact is biased toward the reference position in the optical axis direction.

  In this embodiment, even if variations in the spring characteristics of the plate spring 5 occur, the biasing force of the movable body 2 by the plate spring 5 is adjusted to suppress variations in the biasing force of the movable body 2 by the plate spring 5. When the drive device 1 is assembled, the height of the protrusion 8e (that is, the amount of protrusion of the protrusion 8e from the upper surface 8c) is adjusted. Specifically, when the lens driving device 1 is assembled, the height of the protrusion 8e is adjusted by crushing the protrusion 8e by heating or pressurizing it. For example, when the lens driving device 1 is assembled, the protrusion 8e is crushed by several tens of μm.

  The spring characteristics of the leaf springs 5 produced in the same production lot are estimated to be stable to some extent. Therefore, in this embodiment, the biasing force of the movable body 2 of the lens driving device 1 in which a certain plate spring 5 is used is measured to determine the adjustment amount of the height of the protrusion 8e (that is, the amount of collapse of the protrusion 8e). At the same time, in the lens driving device 1 in which the leaf spring 5 having the same production lot as that of the leaf spring 5 is used, the protruding portion 8e is crushed with the same crushed amount. Note that the urging force of the movable body 2 by the leaf spring 5 may be measured for each lens driving device 1 to determine the amount of crushing of the protruding portion 8 e for each lens driving device 1.

(Main effects of this form)
As described above, in this embodiment, the protrusion 8 e that contacts the movable body fixing portion 5 a of the leaf spring 5 is formed on the spring fixing portion 8 b of the sleeve 8. Further, in this embodiment, even if the spring characteristics of the leaf spring 5 vary, the biasing force of the movable body 2 by the leaf spring 5 is adjusted to suppress the variation of the biasing force of the movable body 2 by the leaf spring 5. When the lens driving device 1 is assembled, the height of the protrusion 8e is adjusted. Therefore, in this embodiment, the biasing force of the movable body 2 by the leaf spring 5 can be adjusted by adjusting the height of the protrusion 8e even if the magnetic member is not provided as in the lens driving device described in Patent Document 1. It is possible to suppress variation in the urging force of the movable body 2 due to the leaf spring 5. That is, in this embodiment, even if the spring characteristics of the leaf spring 5 vary, the urging force of the movable body 2 by the leaf spring 5 is adjusted with a simple configuration in which a part of the sleeve 8 is used. Variations in the urging force of the movable body 2 can be suppressed. As a result, in this embodiment, even if it is possible to suppress variation in the urging force of the movable body 2 due to the leaf spring 5, the number of parts of the lens driving device 1 is reduced and the cost of the lens driving device 1 is reduced. It becomes possible to do.

  Since the magnetic member used in the lens driving device described in Patent Document 1 is a very thin component, an attempt is made to suppress variation in the urging force of the movable body 2 by the leaf spring 5 using this magnetic member. Then, when the lens driving device 1 is assembled, there arises a problem that the magnetic member is deformed or damaged. In this embodiment, the occurrence of such a problem can be prevented.

  In this embodiment, the protrusion 8e is formed in a substantially cylindrical shape. Therefore, for example, the protrusion 8e is easily crushed as compared to the case where the substantially annular protrusion 8e is formed over the entire circumference of the spring fixing part 8b formed in an approximately annular shape. In other words, in this embodiment, the adjustment work of the height of the protrusion 8e is facilitated. Further, in this embodiment, since the protrusion 8e is crushed by being heated or pressurized, the height of the protrusion 8e is finely adjusted by heating or pressure, and the movable body 2 is attached by the leaf spring 5. It becomes possible to fine-tune the power.

  In this embodiment, the upper end of the protruding portion 8e is in contact with the lower surface of the movable side connecting portion 5k of the movable body fixing portion 5a. In other words, in this embodiment, the upper end of the protrusion 8e for adjusting the urging force of the leaf spring 5 is the movable side of the movable body fixing portion 5a, which is a connecting portion with the arm portion 5c that generates the urging force of the leaf spring 5. It contacts the lower surface of the connecting portion 5k. Therefore, in this embodiment, adjustment of the urging force of the movable body 2 by the leaf spring 5 is easier than in the case where the upper end of the protruding portion 8e is in contact with a position away from the movable side connecting portion 5k.

  In this embodiment, the movable body fixing portion 5 a of the leaf spring 5 is formed in an annular shape, and the spring fixing portion 8 b of the sleeve 8 is formed in an approximately annular shape on the outer peripheral side of the sleeve 8. Therefore, in this embodiment, it is possible to easily position the spring fixing portion 8b and the movable body fixing portion 5a in the front / rear and left / right directions, and as a result, the protrusion 8e and the movable body fixing portion 5a can be easily positioned. It becomes possible to do.

  In this embodiment, the protruding portion 8e and the movable body fixing portion 5a are bonded and fixed. Therefore, it becomes possible to reliably contact the protrusion 8e for adjusting the urging force of the leaf spring 5 and the movable body fixing portion 5a. Therefore, in this embodiment, it is possible to appropriately adjust the bending amount of the arm portion 5c by adjusting the height of the protruding portion 8e, and as a result, the urging force of the movable body 2 by the leaf spring 5 is appropriately adjusted. It becomes possible to adjust to.

(Modification of sleeve and spacer)
FIG. 8 is a perspective view showing a spacer 12 according to another embodiment of the present invention from the non-subject side. FIG. 9 is an enlarged view for explaining a configuration corresponding to the F portion of FIG. 2 when the spacer 12 shown in FIG. 8 is used.

  In the embodiment described above, the protrusion 8e is formed on the upper surface 8c of the spring fixing portion 8b. In addition to this, for example, the protrusion 8e is not formed on the upper surface 8c of the spring fixing portion 8b, but protrudes downward on the spring fixing surface 12b of the spacer 12 as shown in FIG. A protrusion 12e as a fixed-side protrusion (projecting toward 5b) may be formed. In this case, for example, the protrusion 12e is formed in a substantially columnar shape. Specifically, the protrusion 12e is formed in a substantially cylindrical shape.

  The protrusions 12e are formed at two locations on each of the four spring fixing surfaces 12b. As shown in FIG. 9, the fixed body fixing portion 5b is fixed to the protruding portion 12e in a state where the lower end (tip) of the protruding portion 12e is in contact with the lower surface thereof. The fixed body fixing portion 5b is bonded and fixed to the protruding portion 12e by an adhesive applied between the lower surface of the fixed body fixing portion 5b that contacts the lower end of the protruding portion 12e and the spring fixing surface 12b. Further, the lower ends of the two protrusions 12e formed on one spring fixing surface 12b are fixed side connecting portions 5e to 5e with the fixed side connecting portions 5e to 5h sandwiched in the circumferential direction of the leaf spring 5. It is in contact with the vicinity of the lower surface of 5h (see the broken line in FIG. 4). In this case, the movable body fixing portion 5a is adhesively fixed to the upper surface 8c of the spring fixing portion 8b in a state where the lower surface thereof is in contact with the upper surface 8c of the spring fixing portion 8b.

  In this case, in order to suppress variation in the urging force of the movable body 2 by the leaf spring 5 by adjusting the urging force of the movable body 2 by the leaf spring 5 even if variations in the spring characteristics of the leaf spring 5 occur, When the lens driving device 1 is assembled, the height of the protrusion 12e (that is, the amount of protrusion of the protrusion 12e from the spring fixing surface 12b) is adjusted. Specifically, when the lens driving device 1 is assembled, the height of the protrusion 12e is adjusted by crushing the protrusion 12e by heating or pressurizing it.

  Thus, even when the protrusion 8e is not formed on the upper surface 8c of the spring fixing portion 8b and the protrusion 12e is formed on the spring fixing surface 12b of the spacer 12, the same effect as the above-described embodiment can be obtained. Can be obtained. In other words, in this case, the movable body 2 is attached by the leaf spring 5 by adjusting the height of the protrusion 12e even if the magnetic member is not provided as in the lens driving device described in Patent Document 1. It is possible to suppress variations in the urging force of the movable body 2 by the leaf spring 5 by adjusting the urging force. Further, since the protrusion 12e is formed in a substantially cylindrical shape, for example, the protrusion 12e is compared with the case where the protrusion 12e is formed so that the shape when viewed from the optical axis direction is a substantially arc shape. It becomes easy to crush the part 12e.

  Further, since the protrusion 12e is heated or pressurized and crushed, the height of the protrusion 12e is finely adjusted by heating or pressurization, and the urging force of the movable body 2 by the leaf spring 5 is finely adjusted. It becomes possible. Further, the lower end of the protrusion 12e for adjusting the urging force of the leaf spring 5 is fixed to the fixed-side linking portion 5e of the fixed body fixing portion 5b, which is a linking portion with the arm portion 5c that generates the urging force of the leaf spring 5. Since it is in contact with the vicinity of the lower surface of 5h, the urging force of the movable body 2 by the leaf spring 5 is compared with the case where the lower end of the protrusion 12e is in contact with a position away from the fixed side connecting portions 5e to 5h. It becomes easy to adjust. In addition, since the protruding portion 12e and the fixed body fixing portion 5b are bonded and fixed, the protruding portion 12e for adjusting the urging force of the leaf spring 5 and the fixed body fixing portion 5b can be reliably brought into contact with each other. As a result, by adjusting the height of the protrusion 12e, the amount of bending of the arm 5c can be adjusted appropriately, and the urging force of the movable body 2 by the leaf spring 5 is adjusted appropriately. It becomes possible.

  Further, in the case where the protrusion 12e is formed on the spring fixing surface 12b of the spacer 12 without the protrusion 8e being formed on the upper surface 8c of the spring fixing portion 8b, the following effects can be obtained. That is, since the spring fixing surface 12b and the fixing body fixing portion 5b are disposed at each of the four corners of the lens driving device 1 capable of securing a relatively wide space, a plurality of protrusions 12e are provided on the spring fixing surface 12b. It is possible to form the protrusions 12e having various shapes.

  The protrusion 8e may be formed on the upper surface 8c of the spring fixing portion 8b, and the protrusion 12e may be formed on the spring fixing surface 12b. In this case, the urging force of the movable body 2 by the leaf spring 5 may be adjusted by crushing either the projection 8e or the projection 12e, or both the projection 8e and the projection 12e may be crushed. Thus, the urging force of the movable body 2 by the leaf spring 5 may be adjusted.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the embodiment described above, the leaf spring 5 includes the four arm portions 5c. In addition, for example, the leaf spring 5 may include two or three arm portions 5c, or may include five or more arm portions 5c.

  In the embodiment described above, the upper end of the protrusion 8e is in contact with the lower surface of the movable side connecting portion 5k of the movable body fixing portion 5a. In addition to this, for example, the upper end of the protruding portion 8e may abut on the vicinity of the lower surface of the movable side connecting portion 5k. Further, the upper end of the protruding portion 8e may abut on the lower surface of the movable body fixing portion 5a away from the movable side connecting portion 5k.

  In the embodiment described above, the four protrusions 8e are formed on the upper surface 8c of the spring fixing portion 8b. However, the number of the protrusions 8e formed on the upper surface 8c of the spring fixing portion 8b is two or three. There may be five or more. For example, when the leaf spring 5 includes three arm portions 5c, the number of the protruding portions 8e formed on the upper surface 8c of the spring fixing portion 8b may be three. In this case, for example, the upper ends of the three projecting portions 8e are the lower surfaces of the three movable side connecting portions 5k of the movable body fixing portion 5a or the three movable side connecting portions 5k, respectively. It contacts the vicinity of the lower surface of. Even when the number of the protrusions 8e formed on the upper surface 8c of the spring fixing portion 8b is larger than the number of the arm portions 5c of the leaf spring 5, the upper end of the protrusion 8e is the movable side connecting portion of the leaf spring 5. It is preferable to contact the lower surface of 5k or the vicinity of the lower surface of the movable side connecting portion 5k.

  In the above-described embodiment, the protrusion 8e is formed in a substantially cylindrical shape. However, the protrusion 8e may be formed in a polygonal column shape such as a substantially quadrangular column shape or a substantially elliptical column shape. good. Further, the protrusion 8e may be formed so that the shape when viewed from the optical axis direction is a substantially arc shape, or may be formed in an annular shape over the entire circumference of the spring fixing portion 8b.

  In the modified example of the sleeve 8 and the spacer 12 described above, the lower end of the protruding portion 12e is in contact with the vicinity of the lower surface of the fixed side connecting portions 5e to 5h. In addition to this, for example, the lower end of the protrusion 12e may be in contact with the lower surface of the fixed side connecting portions 5e to 5h, or the lower surface of the fixed body fixing portion 5b at a location away from the fixed side connecting portions 5e to 5h. You may contact. Moreover, although the projection part 12e is formed in the substantially cylindrical shape, the projection part 12e may be formed in polygonal column shapes, such as a substantially square column shape, and may be formed in the substantially elliptical column shape. Further, the protrusion 12e may be formed so that the shape when viewed from the optical axis direction is a substantially arc shape or a substantially rectangular shape.

  In the modification of the sleeve 8 and the spacer 12 described above, two protrusions 12e are formed on one spring fixing surface 12b, but the number of protrusions 12e formed on one spring fixing surface 12b is as follows. There may be one, or three or more. For example, one protrusion 12e may be formed on one spring fixing surface 12b so that the lower end of the protrusion 12e is in contact with the lower surface of each of the fixed side connecting portions 5e to 5h.

  In the embodiment described above, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is a substantially square shape, but the lens driving device 1 has a shape when viewed from the optical axis direction. You may form so that it may become a substantially rectangular shape. The lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is a polygonal shape such as a substantially hexagonal shape, or a substantially circular shape or a substantially elliptical shape. Also good.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 5 Leaf spring (spring member)
5a Movable body fixing portion 5b Fixed body fixing portion 5c Arm portions 5e to 5h Fixed side connecting portion 5k Movable side connecting portion 8b Spring fixing portion (movable side spring fixing portion)
8e Projection (movable projection)
12a Spring fixing part (fixed side spring fixing part)
12e Projection (fixed side projection)
L Optical axis Z Optical axis direction

Claims (8)

A movable body that holds a lens and is movable in the optical axis direction of the lens, a fixed body that holds the movable body so as to be movable in the optical axis direction, and a spring member that connects the movable body and the fixed body Prepared,
The spring member includes a movable body fixing portion fixed to the movable body, a fixed body fixing portion fixed to the fixed body, and a plurality of arm portions that connect the movable body fixing portion and the fixed body fixing portion. And urging the movable body toward a reference position of the movable body in the optical axis direction,
The movable body includes a movable side spring fixing portion to which the movable body fixing portion is fixed,
The fixed body includes a fixed-side spring fixing portion to which the fixed body fixing portion is fixed,
Said movable spring fixing portion, wherein the movable protrusion toward the movable body fixing portion abuts against the protruding movable body fixing part is formed Rutotomoni, between said movable body fixing portion and the movable spring fixing portion The movable-side protrusion and the movable body fixing portion are bonded and fixed by an adhesive applied to the surface , and / or the fixed-side spring fixing portion protrudes toward the fixed body fixing portion and is fixed. Rutotomoni formed fixed side protrusion abutting the body fixing portion, wherein the fixed body fixing portion and the fixed-side protrusion by the adhesive applied between the fixed side spring fixing portion and the fixed body fixing portion A lens driving device characterized in that is bonded and fixed .   The lens driving device according to claim 1, wherein the movable-side protrusion and / or the fixed-side protrusion are formed in a substantially column shape.   The lens driving device according to claim 2, wherein the movable side protrusion and / or the fixed side protrusion is formed in a substantially cylindrical shape. A plurality of movable side protrusions are formed on the movable side spring fixing portion,
Each of the plurality of movable-side protrusions is in contact with each of the movable-side connecting portions that are the connecting portions of the movable body fixing portion and the arm portion, or in the vicinity of each of the movable-side connecting portions. the lens driving device according to any one of claims 1 to 3, characterized in that it is arranged so as to contact the. The movable body fixing portion is formed in a substantially annular shape,
The movable side spring fixing portion is formed in a substantially annular shape on the outer peripheral side of the movable body,
Said movable spring fixing portion, the lens driving device according to any one of 4 claims 1, wherein the movable protrusions are formed. A plurality of the fixed side protrusions are formed on the fixed side spring fixing portion,
Each of the plurality of fixed-side protrusions is in contact with each of the fixed-side connecting portions that are the connecting portions of the fixed body fixing portion and the arm portion, or in the vicinity of each of the fixed-side connecting portions. the lens driving device according to any one of claims 1 to 5, characterized in that it is arranged so as to contact the. It is formed so that the shape when viewed from the optical axis direction is a substantially square shape,
The fixed side spring fixing portion and the fixed body fixing portion are arranged at each of the four corners of the lens driving device,
Wherein the fixed side spring fixing portion, the lens driving device according to any one of 6 claims claim 1, wherein the fixed-side protrusions are formed. A method for manufacturing a lens driving device according to any one of claims 1 to 7,
The method for manufacturing a lens driving device, wherein the movable side protrusion and / or the fixed side protrusion are crushed by being heated or pressurized.

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