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CN114174917B - Lens driving device and camera module - Google Patents

Lens driving device and camera module Download PDF

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Publication number
CN114174917B
CN114174917B CN202080053889.3A CN202080053889A CN114174917B CN 114174917 B CN114174917 B CN 114174917B CN 202080053889 A CN202080053889 A CN 202080053889A CN 114174917 B CN114174917 B CN 114174917B
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CN
China
Prior art keywords
magnet
magnetic field
field generating
driving device
coil
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202080053889.3A
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Chinese (zh)
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CN114174917A (en
Inventor
安藤润
大下克彦
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Alps Alpine Co Ltd
Original Assignee
Alps Electric Co Ltd
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Filing date
Publication date
Application filed by Alps Electric Co Ltd filed Critical Alps Electric Co Ltd
Publication of CN114174917A publication Critical patent/CN114174917A/en
Application granted granted Critical
Publication of CN114174917B publication Critical patent/CN114174917B/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/18—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with coil systems moving upon intermittent or reversed energisation thereof by interaction with a fixed field system, e.g. permanent magnets

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lens Barrels (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
  • Studio Devices (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

透镜驱动装置(101)具备间隔部件(1)、罩部件(4)、磁场产生部件(5)和上侧板簧(16)。罩部件(4)由非磁性材料形成，具有包括相互对置的一对侧板部的外周壁部(4A)和顶部(4B)。间隔部件(1)的一部分与罩部件(4)的顶部(4B)抵接而配置，并且上侧板簧(16)被固定。而且，间隔部件(1)具有：框状部(1C)，与顶部(4B)对置；以及突出部(1P)，从框状部(1C)向下方(Z2方向)突出并与外周壁部(4A)对置。磁场产生部件(5)呈在与光轴方向正交的方向上延伸的形状，以被夹在突出部(1P)与外周壁部(4A)之间的状态被固定于外周壁部(4A)。

The lens driving device (101) comprises a spacing member (1), a cover member (4), a magnetic field generating member (5) and an upper leaf spring (16). The cover member (4) is formed of a non-magnetic material and has an outer peripheral wall portion (4A) and a top portion (4B) including a pair of side plates facing each other. A portion of the spacing member (1) is arranged to abut against the top portion (4B) of the cover member (4), and the upper leaf spring (16) is fixed. In addition, the spacing member (1) has: a frame-shaped portion (1C) facing the top portion (4B); and a protrusion (1P) protruding downward (Z2 direction) from the frame-shaped portion (1C) and facing the outer peripheral wall portion (4A). The magnetic field generating member (5) is in a shape extending in a direction orthogonal to the optical axis direction, and is fixed to the outer peripheral wall portion (4A) in a state of being sandwiched between the protrusion (1P) and the outer peripheral wall portion (4A).

Description

Lens driving device and camera module
Technical Field
The present disclosure relates to a lens driving device mounted in, for example, a portable device with a camera, and a camera module including the lens driving device.
Background
Conventionally, a lens driving apparatus is known, which includes: a magnetic yoke including an outer tube portion, a lens holder (lens holding member), a coil disposed on an outer periphery of the lens holding member, and a flat plate-shaped permanent magnet attached to an inner wall surface of the outer tube portion so as to face the coil (see patent document 1). In this lens driving device, a flat plate-shaped permanent magnet is attracted to the inner wall surface of an outer tube section formed of a magnetic material when the lens driving device is assembled.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2012-88432
Disclosure of Invention
Technical problem to be solved by the invention
The outer tube portion is sometimes formed of a nonmagnetic material. The outer cylindrical portion formed of a nonmagnetic material is used, for example, when a plurality of lens driving devices are arranged in an aligned manner. This is to prevent the outer cylindrical portion formed of a magnetic material in one lens driving device from interfering with the permanent magnet in the other lens driving device.
However, when the outer tube portion of the permanent magnet is made of a nonmagnetic material, the magnetic force cannot be utilized, and therefore the permanent magnet cannot be adsorbed to the outer tube portion. Therefore, the above-described structure including the outer cylindrical portion formed of the nonmagnetic material may be difficult to assemble.
Accordingly, it is desirable to provide a lens driving device capable of improving the assemblability when a magnetic field generating member is fixed to a cover member formed of a nonmagnetic material.
Means for solving the technical problems
The lens driving device according to an embodiment of the present invention includes: a fixed-side member including a cover member; a lens holding member located in the cover member and configured to hold a lens body; a coil held by the lens holding member; a magnetic field generating member facing the coil; and a leaf spring having: a fixed-side support portion fixed to the fixed-side member; a movable side support part fixed to the lens holding member; and an arm portion provided between the fixed side support portion and the movable side support portion, the leaf spring supporting the lens holding member so as to be movable in an optical axis direction, the cover member having an outer peripheral wall portion and a top portion including a pair of side plate portions opposed to each other, and being formed of a nonmagnetic material, the fixed side member including a spacer member, a portion of which is disposed in contact with the cover member and fixed to the fixed side support portion of the leaf spring, the spacer member having a frame portion opposed to the top portion and a protruding portion protruding downward from the frame portion and opposed to the side plate portion, the magnetic field generating member being in a shape extending in a direction orthogonal to the optical axis direction, the magnetic field generating member being fixed to the side plate portion in a state of being sandwiched between the protruding portion and the side plate portion.
ADVANTAGEOUS EFFECTS OF INVENTION
By the above method, a lens driving device is provided which can improve the assembling property when the magnetic field generating member is fixed to the cover member formed of a non-magnetic material.
Drawings
Fig. 1 is an exploded perspective view of a lens driving device.
Fig. 2A is an upper perspective view of the lens driving device.
Fig. 2B is a front view of the lens driving apparatus.
Fig. 3A is a top view of the lens driving device.
Fig. 3B is a bottom view of the lens driving device.
Fig. 4A is an upper perspective view of the lens driving device in a state where the cover member is omitted.
Fig. 4B is an upper perspective view of the lens driving device in a state where the spacer member and the cover member are omitted.
Fig. 5A is an upper perspective view of the lens holding member.
Fig. 5B is an upper perspective view of the lens holding member with the coil mounted thereon.
Fig. 6A is a lower perspective view of the lens holding member.
Fig. 6B is a lower perspective view of the lens holding member with the coil mounted thereon.
Fig. 7A is a top view of the lens holding member.
Fig. 7B is a top view of the lens holding member with the coil mounted thereon.
Fig. 8A is a bottom view of the lens holding member.
Fig. 8B is a bottom view of the lens holding member with the coil mounted thereon.
Fig. 9A is an enlarged perspective view of a part of the lens holding member.
Fig. 9B is an enlarged perspective view of another portion of the lens holding member.
Fig. 10A is a bottom view of the lens driving device in a state where the metal member and the base member are detached.
Fig. 10B is a bottom view of the lens driving device in a state where the metal member, the base member, the spacer member, the cover member, the upper leaf spring, and the lower leaf spring are removed.
Fig. 11A is a top view of the upper leaf spring.
Fig. 11B is a top view of the lower leaf spring.
Fig. 12A is a bottom view of a connection structure of the lower plate spring and the coil in the lens driving device.
Fig. 12B is a side view of a connection structure of the lower plate spring and the coil in the lens driving device.
Fig. 13 is an exploded perspective view and a completed perspective view of a base member of the lens driving apparatus.
Fig. 14A is a perspective view of the cover member.
Fig. 14B is a perspective view of the spacer member.
Fig. 14C is a perspective view of the cover member embedded with the spacer member.
Fig. 15A is a perspective view of the cover member in which the upper leaf spring is embedded.
Fig. 15B is a perspective view of the cover member in which the second upper magnet is embedded.
Fig. 15C is a perspective view of the cover member in which the second lower magnet is embedded.
Fig. 16A is a perspective view of the protruding portion of the spacer member.
Fig. 16B is a perspective view of the protruding portion of the spacer member.
Fig. 17A is a side view of the second protrusion of the spacer member.
Fig. 17B is a side view of the second protruding portion and the upper leaf spring.
Fig. 17C is a side view of the second protruding portion, the upper plate spring, and the second upper magnet.
Fig. 17D is a side view of the second protruding portion, the upper plate spring, the second upper magnet, and the second lower magnet.
Fig. 18A is a bottom view of the upper assembly.
Fig. 18B is an enlarged view of a main portion of the bottom surface of the upper assembly.
Detailed Description
Hereinafter, a lens driving device 101 according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is an exploded perspective view of the lens driving device 101. Fig. 2A is an upper perspective view of the lens driving device 101, and fig. 2B is a front view of the lens driving device 101 as seen from the Y2 side. Fig. 3A is a top view of the lens driving device 101, and fig. 3B is a bottom view of the lens driving device 101. Fig. 4A is an upper perspective view of the lens driving device 101 with the cover member 4 removed, and fig. 4B is an upper perspective view of the lens driving device 101 with the spacer member 1 and the cover member 4 removed. Fig. 4A and 4B correspond to fig. 2A.
As shown in fig. 1, the lens driving apparatus 101 includes: a lens holding member 2 capable of holding a lens body (not shown); a drive mechanism MK for moving the lens holding member 2 along the optical axis direction (for example, the Z-axis direction) related to the lens body; a plate spring 6 that supports the lens holding member 2 so as to be movable in the optical axis direction; a fixed side member RG to which the leaf spring 6 is fixed; and a metal member 7 that brings about electrical connection between an external power source and the lens driving device 101. The lens is, for example, a cylindrical lens barrel including at least 1 lens, and its central axis is configured to be along the optical axis direction. The "optical axis direction" includes a direction of the optical axis JD associated with the lens body and a direction parallel to the optical axis JD.
As shown in fig. 1, the drive mechanism MK includes: a coil 3 having 2 oval (oval) shaped winding portions 13 (see fig. 5B) held on 2 opposing sides out of 4 sides of the lens holding member 2 having a substantially rectangular parallelepiped shape; and a magnetic field generating member 5 disposed so as to face the coil 3 in the radial direction (direction perpendicular to the optical axis direction).
The cover member 4 is a rectangular box-shaped outer case, and constitutes a part of the fixed-side member RG. In the present embodiment, the cover member 4 is manufactured by punching and drawing a plate material made of a nonmagnetic material such as austenitic stainless steel.
Specifically, as shown in fig. 1, the cover member 4 has a box-like outer shape defining the housing portion 4 s. The cover member 4 includes a rectangular tubular outer peripheral wall portion 4A and a flat annular top portion 4B provided continuously with an upper end (end on the Z1 side) of the outer peripheral wall portion 4A. An opening is formed in the top portion 4B.
The outer peripheral wall portion 4A includes first to fourth side plate portions 4A1 to 4A4. The first side plate portion 4A1 and the second side plate portion 4A2 are opposed to each other to constitute a pair of side plate portions. Similarly, the third side plate portion 4A3 and the fourth side plate portion 4A4 are opposed to each other to constitute the other pair of side plate portions. In the present embodiment, each of the first side plate portion 4A1 and the second side plate portion 4A2 is perpendicular to each of the third side plate portion 4A3 and the fourth side plate portion 4A4.
The cover member 4 configured as described above houses the coil 3 and the magnetic field generating member 5 in the housing portion 4s, and is coupled to the base member 18 to form a housing together with the base member 18 as shown in fig. 2A and 2B.
The magnetic field generating member 5 constitutes a part of the drive mechanism MK. In the present embodiment, as shown in fig. 1, the magnetic field generating member 5 includes a first magnetic field generating member 5A disposed so as to face the first side plate portion 4A1, and a second magnetic field generating member 5B disposed so as to face the second side plate portion 4 A2.
The first magnetic field generating member 5A is constituted by a combination of 2 diode magnets. Fig. 1 shows the N pole of the diode magnet by cross hatching and the S pole by diagonal hatching. The same applies to the other drawings illustrating the magnetic field generating member 5. The combination of 2 diode magnets has an advantage that leakage of the magnetic field to the outside of the cover member 4 can be suppressed, compared with 1 diode magnet, 1 quadrupole magnet, or the like polarized in the optical axis direction. However, the first magnetic field generating member 5A may be configured by 1 dipole magnet or 1 quadrupole magnet. The same applies to the second magnetic field generating member 5B.
Specifically, as shown in fig. 1, the first magnetic field generating member 5A includes a first upper magnet 5AU and a first lower magnet 5AL. The second magnetic field generating member 5B includes a second upper magnet 5BU and a second lower magnet 5BL.
The first upper magnet 5AU, the first lower magnet 5AL, the second upper magnet 5BU, and the second lower magnet 5BL are each substantially rectangular parallelepiped. The magnetic field generating member 5 is located outside the coil 3 (winding portion 13) and is disposed along the 2-surface of the outer peripheral wall portion 4A of the cover member 4. The magnetic field generating member 5 is fixed to the inner surface of the outer peripheral wall 4A by an adhesive. The first upper magnet 5AU, the first lower magnet 5AL, the second upper magnet 5BU, and the second lower magnet 5BL may be plate-shaped or rod-shaped.
The leaf spring 6 includes an upper leaf spring 16 disposed between the lens holding member 2 and the cover member 4 (spacer member 1), and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18. The lower side plate spring 26 includes a lower side plate spring 26A and a lower side plate spring 26B.
The fixed-side member RG includes a spacer member 1, a cover member 4, and a base member 18 in which the metal member 7 is embedded.
The spacer member 1 is configured to prevent the lens holding member 2 from colliding with the cover member 4 when the lens holding member 2 moves in the Z1 direction.
The lens driving device 101 has a substantially rectangular parallelepiped shape, and is mounted on a substrate (not shown) on which an image pickup element (not shown) is mounted. The camera module is constituted by a substrate, a lens driving device 101, a lens body attached to the lens holding member 2, and an image pickup element attached to the substrate so as to face the lens body. The coil 3 is connected to an external power source via the lower leaf spring 26, the metal member 7, and the substrate. When current flows from an external power source to the coil 3, the drive mechanism MK generates electromagnetic force along the optical axis direction.
The lens driving device 101 uses the electromagnetic force to move the lens holding member 2 in the optical axis direction on the Z1 side (subject side) of the image pickup element, thereby realizing an auto focus adjustment function. Specifically, the lens driving device 101 moves the lens holding member 2 in a direction away from the image pickup element to enable macro imaging, and moves the lens holding member 2 in a direction toward the image pickup element to enable infinity imaging.
Next, the lens holder 2 and the driving mechanism MK will be described. Fig. 5A is an upper perspective view of the lens holding member 2, and fig. 5B shows a state in which the coil 3 is wound around the lens holding member 2 of fig. 5A. Fig. 6A is a lower perspective view of the lens holding member 2, and fig. 6B shows a state in which the coil 3 is wound around the lens holding member 2 of fig. 6A. Fig. 7A is a plan view of the lens holding member 2, and fig. 7B shows a state in which the coil 3 is wound around the lens holding member 2 of fig. 7A. Fig. 8A is a bottom view of the lens holding member 2, and fig. 8B shows a state in which the coil 3 is wound around the lens holding member 2 shown in fig. 8A. Fig. 9A is an enlarged perspective view of the portion P shown in fig. 8B, and fig. 9B is an enlarged perspective view of the portion Q shown in fig. 8B. Fig. 10A is a bottom view of the lens driving device 101 in a state where illustration of the metal member 7 and the base member 18 is omitted, and fig. 10B is a bottom view of the lens driving device 101 in a state where illustration of the spacer member 1, the cover member 4, the upper leaf spring 16, and the lower leaf spring 26 is further omitted.
In the present embodiment, the lens holding member 2 is manufactured by injection molding a synthetic resin such as a Liquid Crystal Polymer (LCP). Specifically, as shown in fig. 5A, the lens holding member 2 includes a cylindrical portion 12 formed with a through hole extending in the optical axis direction.
A screw groove is provided on the cylindrical inner peripheral surface of the cylindrical portion 12 so as to mount the lens body. Further, a pedestal portion 12d having 4 concave portions 12dh on the end surface on the subject side is provided in the cylindrical portion 12. As shown in fig. 4A, an inner portion 16i of the upper plate spring 16 is placed on the pedestal portion 12d.
As shown in fig. 5A, a winding protrusion 12p for holding the coil 3 is provided on the outer peripheral surface of the cylindrical portion 12. In the present embodiment, the winding protrusion 12p has a substantially rectangular parallelepiped shape protruding radially outward from the outer peripheral surface of the cylindrical portion 12 so as to wind the coil 3 around the axis perpendicular to the optical axis direction. Specifically, the winding protrusions 12p are disposed on 2 outer surfaces of the lens holding member 2 that face each other. In the present embodiment, the winding protrusion 12p is disposed on the outer side surface on the Y1 side and the outer side surface on the Y2 side.
As shown in fig. 5B, the coil 3 is formed by winding a conductive wire material around the winding protrusion 12p. Specifically, as shown in fig. 6B, the coil 3 includes a first coil 3A disposed so as to face the first side plate portion 4A1, a second coil 3B disposed so as to face the second side plate portion 4A2, and a connecting portion 3C connecting the first coil 3A and the second coil 3B. As shown in fig. 7A and 7B, the winding protrusion 12p includes a first winding protrusion 12pA that winds the first coil 3A and a second winding protrusion 12pB that winds the second coil 3B. In the present embodiment, the coil 3 is fixed to the winding protrusion 12p without using an adhesive, but may be fixed to the winding protrusion 12p using an adhesive. The winding direction of the coil 3 is arbitrary and is determined, for example, by the arrangement (magnetization direction) of the magnetic field generating member 5.
The first coil 3A includes a winding portion 13 as a coil body portion formed by winding around the first winding protrusion 12pA in a ring shape, and the second coil 3B includes a winding portion 13 as a coil body portion formed by winding around the second winding protrusion 12pB in a ring shape. Fig. 5B is a diagram showing a detailed winding state of the conductive wire material covered with the insulating member on the surface of the winding portion 13, for clarity. The same applies to the other drawings illustrating the winding portion 13.
As shown in fig. 6A, the lens holding member 2 includes 2 holding portions 72 as square convex protruding portions protruding downward (Z2 direction) from the end surface on the image pickup element side (Z2 side), and4 protruding portions 2t in a circular convex shape.
As shown in fig. 6B, the holding portion 72 includes a first holding portion 72A corresponding to the winding start side of the coil 3 and a second holding portion 72B corresponding to the winding end side of the coil 3. Both ends of the coil 3 are wound around and held by the holding portions 72.
As shown in fig. 6A and 10A, the protruding portion 2t includes 2 protruding portions 2t corresponding to the lower plate spring 26A and 2 protruding portions 2t corresponding to the lower plate spring 26B. An inner portion 26i serving as a movable side support portion of each of the lower leaf spring 26A and the lower side plate spring 26B is attached to and fixed to the protruding portion 2t. The fixing of the inner portions 26i of the lower leaf springs 26A and the lower leaf springs 26B is achieved by heat staking the protruding portions 2t inserted into the through holes formed in the inner portions 26i. In the drawing relating to the present embodiment, the protruding portion 2t is illustrated in a state where the distal end before being heat staked is not deformed. The protruding portion 2t may be cold-staked.
Next, a driving mechanism MK of the lens driving device 101 will be described. As shown in fig. 10A and 10B, the driving mechanism MK includes the coil 3 and 2 magnetic field generating members 5 disposed so as to face the 2 side plate portions (the first side plate portion 4A1 and the second side plate portion 4A 2) constituting the outer peripheral wall portion 4A of the cover member 4. Specifically, the magnetic field generating member 5 includes a first magnetic field generating member 5A disposed so as to face the first side plate portion 4A1, and a second magnetic field generating member 5B disposed so as to face the second side plate portion 4 A2. The drive mechanism MK generates a drive force (thrust) by the current flowing through the coil 3 and the magnetic field generated by the magnetic field generating member 5, and moves the lens holding member 2 up and down along the optical axis direction.
As shown in fig. 8B, the extension portion 33 of the coil 3 includes a first extension portion 33A connected to the first coil 3A on the winding start side of the coil 3 and a second extension portion 33B connected to the second coil 3B on the winding end side of the coil 3.
Specifically, as shown in fig. 9A, the first extension 33A includes: a winding portion 33m wound around the first holding portion 72A; the first opposing portion 33c extends so as to oppose the bottom surface (Z2-side surface) of the lens holding member 2; and a second opposing portion 33k extending to face an edge portion between the bottom surface and the rear surface (Y1 side surface) of the lens holding member 2. As shown in fig. 9B, the second extension 33B includes: a winding portion 33m wound around the second holding portion 72B; the first opposing portion 33c extends so as to oppose the bottom surface (Z2-side surface) of the lens holding member 2; and a second opposing portion 33k extending to face an edge portion between the bottom surface and the front surface (Y2-side surface) of the lens holding member 2.
In the present embodiment, the first extension portion 33A is wound around the first holding portion 72A of the lens holding member 2 before the wire of the coil 3 is wound around the outer periphery of the first winding protrusion 12 pA. In the example shown in fig. 9A, a part of the wire of the coil 3 is wound around the first holding portion 72A by 4 turns. Thereby, the winding portion 33m is formed in the first holding portion 72A, and a part of the first extending portion 33A is held in the first holding portion 72A. However, the first extension portion 33A may be wound around the first holding portion 72A after the wire of the coil 3 is wound around the outer periphery of the first winding protrusion 12 pA.
Next, the wire material is wound around the outer periphery of the first winding protrusion 12 pA. At this time, as shown in fig. 9A, the wire extending from the winding portion 33m extends so as to face the bottom surface of the lens holding member 2, and further extends so as to face the edge portion located between the bottom surface and the rear surface of the lens holding member 2. At this time, the portion facing the bottom surface of the lens holding member 2 constitutes a first facing portion 33c of the first extension portion 33A, and the portion facing the edge portion of the lens holding member 2 constitutes a second facing portion 33k of the first extension portion 33A.
The second opposing portion 33k of the first extending portion 33A is configured to contact the edge portion of the lens holding member 2 as shown in fig. 9A when extending to oppose the edge portion of the lens holding member 2. Therefore, when a strong impact is applied to the lens driving device 101 due to dropping or the like, the first extension portion 33A of the coil 3 is pressed against the edge portion of the lens holding member 2. In the present embodiment, the edge portion of the lens holding member 2 is configured to be curved. Therefore, the first extension portion 33A is difficult to be cut at the edge portion of the lens holding member 2. The same applies to the edge portion of the lens holder 2 that contacts the second extension 33B.
Thereafter, the connecting portion 3C is formed from the wire drawn from the winding portion 13 of the first coil 3A. Next, the wire is wound around the outer periphery of the second winding protrusion 12pB in the same manner. When the winding of the wire material around the outer periphery of the first winding protrusion 12pA and the winding of the wire material around the outer periphery of the second winding protrusion 12pB are completed, the second extension 33B connected to the end of the winding portion 13 of the second coil 3B on the winding completion side is led out from the front surface side to the bottom surface side of the lens holding member 2 as shown in fig. 9B. Specifically, the second opposing portion 33k extends so as to oppose an edge portion located between the bottom surface and the front surface of the lens holding member 2, the first opposing portion 33c extends so as to oppose the bottom surface of the lens holding member 2, and the winding portion 33m is wound around the second holding portion 72B of the lens holding member 2. In the example shown in fig. 9B, the second extension portion 33B is wound around the second holding portion 72B by 4 turns.
Next, the leaf spring 6 and the fixing-side member RG will be described in detail. Fig. 11A is a plan view of the upper plate spring 16, and fig. 11B is a plan view of the lower plate spring 26. Fig. 12A and 12B are diagrams illustrating an example of a connection structure between the lower plate spring 26A and the coil 3. Specifically, fig. 12A is an enlarged view of the portion T shown in fig. 10A, and fig. 12B is an enlarged view of the lower leaf spring 26A, the coil 3, and the lens holding member 2 when the portion T shown in fig. 10A is viewed from the Y2 side. In fig. 12A and 12B, for ease of explanation, the conductive adhesive CA as the bonding material is indicated by cross hatching. Fig. 13 is a diagram illustrating the base member 18 as the fixed-side member RG. Specifically, fig. 13 includes an exploded perspective view and a completed perspective view of the base member 18 in which the metal member 7 is buried.
In the present embodiment, the plate spring 6 is made of a metal plate mainly made of a copper alloy. The leaf spring 6 includes an upper leaf spring 16 disposed between the lens holding member 2 and the cover member 4 (spacer member 1), and a lower leaf spring 26 disposed between the lens holding member 2 and the base member 18. In a state where the lens holding member 2 is engaged with the leaf springs 6 (the upper leaf spring 16, the lower leaf spring 26A, and the lower side plate spring 26B), the leaf springs 6 support the lens holding member 2 in the air so that the lens holding member 2 can move in the optical axis direction. The lower leaf spring 26A and the lower plate spring 26B function as power feeding means for supplying current to the coil 3. Therefore, the lower leaf spring 26A is electrically connected to one end portion of the coil 3, and the lower leaf spring 26B is electrically connected to the other end portion of the coil 3. A spacer member 1 is arranged between the upper leaf spring 16 and the cover member 4.
As shown in fig. 11A, the upper plate spring 16 has a substantially rectangular shape, including: an inner portion 16i as a movable side support portion fixed to the lens holding member 2; an outer portion 16e as a fixed-side support portion fixed to the spacer member 1 as the fixed-side member RG; and 4 elastic arm portions 16g located between the inner side portion 16i and the outer side portion 16 e. Specifically, the inner portion 16i is provided so as to face the pedestal portion 12d (see fig. 5A) of the lens holding member 2. The outer portion 16e has 4 corner portions 16b and 4 cross bars 16r connecting the adjacent 2 corner portions 16 b. As shown in fig. 4A and 4B, 2 of the 4 bar portions 16r are sandwiched between the spacer member 1 and the magnetic field generating member 5 and fixed by an adhesive. The corner portions 16b are fixed to the corners of the spacer member 1 by an adhesive. The spacer member 1, the cover member 4, and the magnetic field generating member 5 function as a fixed-side member RG.
Specifically, when the upper leaf spring 16 is assembled to the lens driving device 101, as shown in fig. 4A, the inner portion 16i is placed on the pedestal portion 12d of the lens holding member 2 (see fig. 5A). The inner portion 16i is fixed to the lens holder 2 by fixing the inner portion 16i and the pedestal 12d with an adhesive. As shown in fig. 4B, the outer portion 16e is in contact with the upper surface (Z1 side surface) of the magnetic field generating member 5, and is sandwiched and fixed between the spacer member 1 (see fig. 4A) and the magnetic field generating member 5.
As shown in fig. 11A, the upper plate spring 16 has a shape substantially rotationally symmetrical 4 times with respect to the optical axis JD. The upper plate spring 16 is fixed to the lens holding member 2 at an inner portion 16i and fixed to the cover member 4 via the spacer member 1 at an outer portion 16 e. Therefore, the upper plate spring 16 can support the lens holding member 2 in the air with good balance.
As shown in fig. 11B, the inner shapes of the lower leaf springs 26A and 26B are substantially semicircular. The lower leaf springs 26A and the lower side plate springs 26B each include: an inner portion 26i as a movable side support portion fixed to the lens holding member 2; an outer portion 26e as a fixed-side support portion fixed to the base member 18 as a fixed-side member RG; and an elastic arm portion 26g located between the inner portion 26i and the outer portion 26 e.
As shown in fig. 11B, the inner portions 26i of the lower leaf springs 26A and 26B each include: the lens holder 2 includes 2 inner engaging portions 26c engaged with the lens holder 2, a first connecting portion 26p connecting the 2 inner engaging portions 26c, and a connecting plate portion 26h facing the extending portion 33 of the coil 3.
When the lower leaf spring 26A and the lower plate spring 26B are assembled to the lens driving device 101, the 4 protruding portions 2t of the lens holding member 2 shown in fig. 6A are inserted into circular through holes provided in the inner joint portions 26c of the lower leaf spring 26A and the lower plate spring 26B shown in fig. 11B, respectively, and fit together. Thereby, the inner portions 26i of the lower leaf springs 26A and 26B are positioned and fixed to the lens holding member 2. The lower leaf springs 26A and 26B are fixed to the lens holding member 2 by, for example, heat caulking or cold caulking the protruding portion 2t of the lens holding member 2.
The relationship between the lower plate spring 26A, the lens holder 2, and the coil 3 will be mainly described below. However, the description of the lower plate spring 26A applies equally to the lower plate spring 26B.
As shown in fig. 12A and 12B, when the lens driving device 101 is assembled, the connection plate portion 26h of the inner portion 26i of the lower plate spring 26A faces the bank 82 of the lens holding member 2. That is, as shown in fig. 12A, the surface of the connecting plate portion 26h on the subject side (Z1 side) is opposed to the accommodating portion 82s formed by the dam portion 82. As shown in fig. 12A, the first opposing portion 33c of the second extension portion 33B of the coil 3 extends between the surface of the inner portion 26i (the connecting plate portion 26 h) of the lower plate spring 26A on the subject side (Z1 side) and the surface of the lens holding member 2 on the imaging element side (Z2 side).
As shown in fig. 9B, the jetty 82 includes: an inner wall 82u located on the center side of the lens holder 2; an outer side wall 82v located outside and opposite to the inner side wall 82 u; and a side wall 82w located between the inner side wall 82u and the outer side wall 82v on the side closer to the second holding portion 72B. As shown in fig. 9B, an opening 82z is formed by cutting the wall portion on the side of the bank 82 away from the second holding portion 72B. The space surrounded by 3 wall portions (inner wall portion 82u, outer wall portion 82v, and side wall portion 82 w) forms a housing portion 82s. The housing 82s is configured to be able to house the conductive adhesive CA that connects the second extension 33B of the coil 3 and the lower plate spring 26A. In the present embodiment, the bank 82 is formed at a position adjacent to the second holding portion 72B, and therefore the side wall of the second holding portion 72B is suitable as the side wall portion 82w of the bank 82. Therefore, the receiving portion 82s is provided at a position adjacent to the second holding portion 72B.
When the lower leaf spring 26A is assembled to the lens holding member 2, as shown in fig. 12B, the second holding portion 72B protrudes downward (in the Z2 direction) from the inner portion 26i of the lower leaf spring 26A so that the tip end thereof is positioned on the image pickup element side (Z2 side) of the inner portion 26 i. A part of the winding portion 33m is also wound around the second holding portion 72B so as to be located on the image pickup device side (Z2 side) of the inner portion 26 i.
The lower plate spring 26A and the second extension 33B of the coil 3 are electrically and physically connected to each other by a conductive adhesive CA in which a conductive filler such as silver particles is dispersed in a synthetic resin. Specifically, before the lower plate spring 26A is assembled to the lens holder 2, the housing 82s surrounded by the bank 82 of the lens holder 2 is filled with the conductive adhesive CA, and then the lower plate spring 26A is attached to the lens holder 2. Then, the protruding portion 2t of the lens holding member 2 is heat staked, and the conductive adhesive CA is thermally cured. Before the conductive adhesive CA is filled into the storage portion 82s and thermally cured, the lens holding member 2 is inverted so that the second holding portion 72B protrudes vertically upward. Therefore, even when the conductive adhesive CA has fluidity, the conductive adhesive CA can be properly held at a desired position (position within the housing 82 s). Further, a part of the first opposing portion 33c is disposed in the accommodating portion 82s, and is thus buried in the conductive adhesive CA. The conductive adhesive CA is not limited to the thermosetting type, and may be an ultraviolet curable adhesive or a moisture curable adhesive.
As shown in fig. 11B, the outer portion 26e of the lower leaf spring 26A includes 2 outer engaging portions 26d engaged with the base member 18 and a second coupling portion 26q connecting the 2 outer engaging portions 26 d. The through hole provided in the outer joint portion 26d of the lower leaf spring 26A is fitted into a projection 18t (see fig. 13) provided on the upper surface of the base member 18. Thereby, the outer portion 26e of the lower side plate spring 26A is positioned and fixed to the base member 18.
As shown in fig. 11B, the lower leaf spring 26A and the lower leaf spring 26B have a shape rotationally symmetrical 2 times with respect to the optical axis JD. Further, the lower leaf spring 26A is connected to the lens holding member 2 at 2 inner engaging portions 26c and connected to the base member 18 at 2 outer engaging portions 26 d. The same applies to the lower plate spring 26B. With this configuration, the lower leaf spring 26A and the lower plate spring 26B can support the lens holding member 2 in the air with good balance in a state where the lens holding member 2 can be moved in the optical axis direction.
Next, details of the fixed-side member RG will be described. The fixing-side member RG includes a spacer member 1 that fixes the upper leaf spring 16, the cover member 4, and the magnetic field generating member 5, and a base member 18 that fixes each of the lower leaf spring 26A and the lower leaf spring 26B.
The base member 18 is manufactured by injection molding using a synthetic resin such as a liquid crystal polymer. In the present embodiment, as shown in fig. 13, the base member 18 is a member having a substantially rectangular plate-like outer shape, and a circular opening 18k is formed in the center. Further, 6 protruding portions 18t protruding upward are provided on a surface (upper surface) of the base member 18 on the subject side (Z1 side). The protruding portion 18t is inserted into and fitted into a through hole provided in the outer joint portion 26d of each of the lower leaf spring 26A and the lower leaf spring 26B. At this time, the protruding portion 18t is fixed to the outer joint part 26d by heat staking. In the drawing relating to the present embodiment, the protruding portion 18t is illustrated in a state in which the tip after heat staking is deformed. The protruding portion 18t may be fixed to the outer joint part 26d by cold staking.
As shown in fig. 13, the metal member 7 formed of a metal plate containing copper, iron, or an alloy containing these as a main component is insert molded and embedded in the base member 18.
The metal member 7 includes first to third metal members 7A to 7C. The first metal member 7A has a connection portion 7AC exposed from the upper surface (surface on the Z1 side) of the base member 18, and the second metal member 7B has a connection portion 7BC exposed from the upper surface (surface on the Z1 side) of the base member 18. The surface of the connection portion 7AC and the surface of the connection portion 7BC are located on the same plane.
The connection portion 7AC is connected to the outer joint portion 26d of the lower leaf spring 26A via a conductive joint material in a state of facing the through hole 26dt (see fig. 11B) formed in the outer joint portion 26d of the lower leaf spring 26A. The conductive bonding material is, for example, solder, conductive adhesive, or the like. In this embodiment, the conductive bonding material is a conductive adhesive.
Similarly, the connection portion 7BC is connected to the outer joint portion 26d of the lower leaf spring 26B via a conductive joint material in a state of being opposed to the through hole 26dt (see fig. 11B) formed in the outer joint portion 26d of the lower leaf spring 26B.
The first metal member 7A has a terminal portion 7AT protruding downward from the bottom surface (surface on the Z2 side) of the base member 18, and the second metal member 7B has a terminal portion 7BT protruding downward from the bottom surface (surface on the Z2 side) of the base member 18.
The third metal member 7C has end portions 7C1 to 7C4 protruding outward from the corner of the base member 18 in the direction perpendicular to the optical axis direction. As shown in fig. 2A and 2B, the end portions 7C1 to 7C4 are respectively configured to contact the lower end portions of the four corners of the cover member 4.
The base member 18 is positioned by combining the inner surface of the outer peripheral wall portion 4A of the cover member 4 with the outer peripheral side surface of the base member 18, and then the end portions 7C1 to 7C4 are welded to the lower end portions of the four corners of the cover member 4, respectively, to be fixed to the cover member 4. The cover part 4 and the base part 18 may also be at least partially fixed with an adhesive.
Next, the upper assembly UA of the lens driving device 101 will be described with reference to fig. 14A to 14C and fig. 15A to 15C. The upper assembly UA mainly includes the spacer member 1, the cover member 4, the upper leaf spring 16, and the magnetic field generating member 5. Fig. 14A to 14C and fig. 15A to 15C are diagrams for explaining an assembly procedure of the upper assembly UA. Specifically, fig. 14A shows a perspective view of the cover member 4 in an inverted state, fig. 14B shows a perspective view of the spacer member 1 in an inverted state, and fig. 14C shows a perspective view of the cover member 4 in which the spacer member 1 is fitted. Fig. 15A is a perspective view of the cover member 4 further incorporating the upper plate spring 16, fig. 15B is a perspective view of the cover member 4 further incorporating the second upper magnet 5BU, and fig. 15C is a perspective view of the cover member 4 further incorporating the second lower magnet 5 BL.
Fig. 15C shows a state in which the upper assembly UA is completed. Thereafter, the upper assembly UA is assembled to the lower assembly. The lower assembly is mainly composed of the lens holding member 2, the coil 3, the lower leaf spring 26, and the base member 18. The lower assembly corresponds to a structure in which the magnetic field generating member 5 and the upper plate spring 16 are removed from the structure shown in fig. 4B.
The upper assembly UA of the lens driving device 101 is typically assembled in a state where the cover member 4 is inverted, that is, in a state where the inner side (Z2 side) of the top portion 4B faces upward, as shown in fig. 14A. The spacer member 1 is fitted into the cover member 4 as shown in fig. 14C in an inverted state as shown in fig. 14B.
The spacer member 1 is a member configured to abut against an outer portion 16e, which is a fixed side support portion of the upper leaf spring 16, and includes a frame portion 1C and a protruding portion 1P as shown in fig. 14B. The frame-shaped portion 1C is a rectangular frame-shaped member configured to face the top portion 4B of the cover member 4, and includes first to fourth extension portions 1C1 to 1C4 extending along the first to fourth side plate portions 4A1 to 4A4 of the cover member 4, respectively. The protruding portion 1P is a member configured to protrude downward (Z2 direction) from the frame-like portion 1C, that is, to protrude in a direction away from the top portion 4B, and includes first to fourth protruding portions 1P1 to 1P4. The protruding portion 1P is configured to face the inner wall surface of the outer peripheral wall portion 4A of the cover member 4 when the spacer member 1 is fitted into the cover member 4.
Specifically, the spacer member 1 is disposed inside the cover member 4 so that the upper surface (surface on the Z1 side) of the frame-shaped portion 1C contacts the lower surface (surface on the Z2 side) of the top portion 4B of the cover member 4. In the present embodiment, the frame-like portion 1C of the spacer member 1 is bonded and fixed to the top portion 4B of the cover member 4 by an adhesive.
More specifically, as shown in fig. 14C, the first protruding portion 1P1 and the second protruding portion 1P2 are configured to face the second side plate portion 4 A2. The third protruding portion 1P3 and the fourth protruding portion 1P4 are also not visible in fig. 14C, but are configured to face the first side plate portion 4 A1.
After that, the upper plate spring 16 is fitted into the cover member 4 in an inverted state as shown in fig. 15A. Specifically, the upper leaf spring 16 is disposed inside the cover member 4 so that the upper surface (surface on the Z1 side) of the horizontal bar portion 16r contacts the lower surface (surface on the Z2 side) of the frame-like portion 1C of the spacer member 1. In the present embodiment, the outer portion 16e of the upper plate spring 16 is fixed to the frame-like portion 1C by an adhesive.
Then, the adhesive AD is applied to the inner walls of each of the first side plate portion 4A1 and the second side plate portion 4 A2. Specifically, as shown in fig. 15A, an adhesive AD for adhering and fixing the second magnetic field generating member 5B to the inner wall of the second side plate portion 4A2 is applied to the inner wall of the second side plate portion 4 A2. Although not visible in fig. 15A, an adhesive AD for adhering and fixing the first magnetic field generating member 5A to the inner wall of the first side plate portion 4A1 is also applied to the inner wall of the first side plate portion 4 A1.
In the present embodiment, the adhesive including the adhesive AD is a thermosetting adhesive. However, the adhesive may be other adhesives such as a moisture-curable adhesive and an ultraviolet-curable adhesive.
Thereafter, as shown in fig. 15B, the second upper magnet 5BU of the second magnetic field generating member 5B is fitted into the cover member 4. Specifically, the second upper magnet 5BU is fitted into a space between the inner wall of the second side plate portion 4A2 and each of the first protruding portion 1P1 and the second protruding portion 1P 2. In the present embodiment, the first protruding portion 1P1 and the second protruding portion 1P2 are each configured to be able to press the second upper magnet 5BU against the inner wall of the second side plate portion 4A2 when the second upper magnet 5BU is fitted. That is, the first protruding portion 1P1 and the second protruding portion 1P2 are configured so that the space defined by the first protruding portion 1P1, the second protruding portion 1P2, and the second side plate portion 4A2 can be slightly fitted to the second upper magnet 5 BU. In fig. 15B, the same applies to the first upper magnet 5AU which is not visible.
Then, the second lower magnet 5BL of the second magnetic field generating member 5B is fitted into the cover member 4 as shown in fig. 15C, similarly to the second upper magnet 5 BU. Specifically, the second lower magnet 5BL is fitted into a space between the inner wall of the second side plate portion 4A2 and each of the first protruding portion 1P1 and the second protruding portion 1P2 on the lower side (Z2 side) of the second upper magnet 5 BU. In the present embodiment, the first protruding portion 1P1 and the second protruding portion 1P2 are configured so that the second lower magnet 5BL can be pressed against the inner wall of the second side plate portion 4A2 when the second lower magnet 5BL is fitted. That is, the first protruding portion 1P1 and the second protruding portion 1P2 are configured so that the space defined by the first protruding portion 1P1, the second protruding portion 1P2, and the second side plate portion 4A2 can be slightly fitted to the second lower magnet 5 BL. In fig. 15C, the same applies to the first lower magnet 5AL, which is not visible.
Next, with reference to fig. 16A and 16B, details of the protruding portion 1P in the spacer member 1 will be described. Fig. 16A and 16B are perspective views of the protruding portion 1P. Specifically, fig. 16A is a perspective view of the second protruding portion 1P2 when the second protruding portion 1P2 is viewed from the X1 side, and fig. 16B is a perspective view of the second protruding portion 1P2 when the second protruding portion 1P2 is viewed from the Y2 side. The description of the second protruding portion 1P2 described below applies equally to each of the first protruding portion 1P1, the third protruding portion 1P3, and the fourth protruding portion 1P 4.
As shown in fig. 16A and 16B, the second protrusion 1P2 has a first portion F1 facing the inner (Y1 side) end surface of the second magnetic field generating member 5B (see fig. 15C) and a second portion F2 facing the one end (X2 side) end surface of the second magnetic field generating member 5B. The second protrusion 1P2 is formed in a substantially L-shape in cross section parallel to the XY plane.
Specifically, the first portion F1 is configured to have a parallel portion PS and a tapered portion TS. The parallel portion PS is located closer to the root side of the second protruding portion 1P2 than the taper portion TS, and is substantially parallel to the second side plate portion 4 A2. The tapered portion TS is located closer to the distal end side of the second protruding portion 1P2 than the parallel portion PS, and the distance between the tapered portion TS and the second side plate portion 4A2 increases as the tapered portion moves toward the distal end side of the second protruding portion 1P 2. With this structure, the second magnetic field generating member 5B is stably held in surface contact with the parallel portion PS and the second side plate portion 4A2, respectively.
The tapered portion TS facilitates insertion of the second magnetic field generating member 5B into the space between the parallel portion PS and the inner wall of the second side plate portion 4 A2. In the present embodiment, the second portion F2 is also configured to have a tapered portion on the distal end side, similarly to the first portion F1. The taper TS may be omitted.
The second portion F2 is configured to have a convex portion PR protruding toward the second magnetic field generating member 5B. In the present embodiment, the convex portion PR is located on the root side of the second protruding portion 1P2 and protrudes toward the side end face side of the second magnetic field generating member 5B. With this configuration, the protrusion PR forms a gap for flowing in the adhesive AD between the side end surface of the second magnetic field generating member 5B and the second portion F2. That is, the protrusion PR can prevent the side end surface of the second magnetic field generating member 5B from adhering to the second portion F2 and blocking the gap for the inflow of the adhesive AD.
Next, the positional relationship between the protruding portion 1P and the magnetic field generating member 5 will be described with reference to fig. 17A to 17D. Fig. 17A to 17D are diagrams illustrating an assembly procedure of the upper assembly UA. Specifically, fig. 17A is a side view of the second protruding portion 1P2 of the spacer member 1 fitted into the inside of the cover member 4, not shown, when the second protruding portion 1P2 is viewed from the Y2 side. Fig. 17B is a side view of the second protruding portion 1P2 of the spacer member 1 and the upper plate spring 16 fitted into the inside of the cover member 4, not shown, when seen from the Y2 side. Fig. 17C is a side view of the second protruding portion 1P2 of the spacer member 1, the upper plate spring 16, and the second upper magnet 5BU fitted into the inside of the cover member 4, not shown, when viewed from the Y2 side. Fig. 17D is a side view of the second protruding portion 1P2, the upper plate spring 16, the second upper magnet 5BU, and the second lower magnet 5BL of the spacer member 1 fitted into the inside of the cover member 4, not shown, when seen from the Y2 side.
In the present embodiment, as shown in fig. 17C, the parallel portion PS is configured such that the tip end thereof is located at a distance D1 below (on the Z2 side) the lower surface (on the Z2 side) of the second upper magnet 5 BU. That is, the parallel portion PS is configured to be in contact with a part of an end surface of the inner side (Y1 side) of the second lower magnet 5BL arranged on the lower side (Z2 side) of the second upper magnet 5 BU. In other words, the second protrusion 1P2 is configured such that the boundary BD between the parallel portion PS and the tapered portion TS is located at a position facing the second lower magnet 5BL. According to this structure, similarly to the second upper magnet 5BU, the second lower magnet 5BL is fixed to the inner wall of the second side plate portion 4A2 with a part thereof sandwiched between the parallel portion PS of the second protrusion portion 1P2 and the inner wall of the second side plate portion 4 A2. That is, the parallel portion PS constituting the first portion F1 of the second protruding portion 1P2 can hold not only the second upper magnet 5BU but also the second lower magnet 5BL in parallel with the inner wall of the second side plate portion 4 A2.
In the present embodiment, as shown in fig. 17D, the second protruding portion 1P2 is configured such that the tip end thereof is located at a distance D2 above (Z1 side) the lower surface (Z2 side surface) of the second lower magnet 5 BL. That is, the second protrusion 1P2 is configured to have a length in the optical axis direction shorter than that of the second magnetic field generating member 5B. This is to save space. However, the second protrusion 1P2 may be formed so that the length in the optical axis direction is equal to or longer than the length of the second magnetic field generating member 5B.
In the present embodiment, as shown in fig. 17C, the convex portion PR is configured to protrude by a width W1 in the X1 direction from the X1 side surface of the second portion F2. According to this configuration, the width W2 between the end surface on the X2 side of the second magnetic field generating member 5B and the surface on the X1 side of the second portion F2 is equal to or greater than the width W1, which is the protruding amount of the protrusion PR, as shown in fig. 17D. Therefore, a sufficient gap for injecting the adhesive AD is ensured between the second magnetic field generating member 5B and the second portion F2 of the second protrusion 1P 2. As a result, the adhesive AD can flow into the gap formed between the second magnetic field generating member 5B and the second portion F2, and the second magnetic field generating member 5B and the second protrusion 1P2 can be reliably adhered and fixed.
Next, details of the upper assembly UA will be described with reference to fig. 18A and 18B. Fig. 18A and 18B are bottom views of the upper assembly UA. Specifically, fig. 18A is a bottom view of the entire upper assembly UA, and fig. 18B is an enlarged view of a portion R shown in fig. 18A.
As shown in fig. 18A, the magnetic field generating member 5 is located between the second portions F2 of the respective pair of protruding portions 1P. Specifically, the second magnetic field generating member 5B is located between the second portion F2 of the first protrusion 1P1 and the second portion F2 of the second protrusion 1P 2. The first magnetic field generating member 5A is located between the second portion F2 of the third protrusion 1P3 and the second portion F2 of the fourth protrusion 1P 4.
As shown in fig. 18B, an adhesive AD is disposed in the gap between one end of the magnetic field generating member 5 and the protruding portion 1P. Specifically, the adhesive AD flows into the gap between the end surface of the second magnetic field generating member 5B on the X2 side and the surface of the second portion F2 on the X1 side constituting the second protrusion 1P 2. As shown in fig. 15A, the adhesive AD is also applied between the second magnetic field generating member 5B and the second side plate portion 4 A2. According to this structure, the spacer member 1, the cover member 4, and the magnetic field generating member 5 are fixed by adhesion with the adhesive AD so as to be fixed so as not to be movable relative to each other.
As described above, the lens driving device 101 of the present embodiment includes: a fixed-side member RG including a cover member 4; a lens holding member 2 which is positioned in the cover member 4 and can hold a lens body; a coil 3 held by the lens holding member 2; a magnetic field generating member 5 opposed to the coil 3; and an upper plate spring 16 that supports the lens holding member 2 so as to be movable in the optical axis direction. The upper plate spring 16 has: an outer portion 16e serving as a fixed-side support portion fixed to the fixed-side member RG; an inner portion 16i as a movable side support portion fixed to the lens holding member 2; and an elastic arm portion 16g provided between the outer portion 16e and the inner portion 16 i. The cover member 4 has an outer peripheral wall portion 4A and a top portion 4B including a pair of side plate portions opposed to each other, and is formed of a nonmagnetic material. The fixed-side member RG includes a spacer member 1, and a part of the spacer member 1 is disposed in contact with the top portion 4B of the cover member 4, and an outer portion 16e of the upper-side plate spring 16 is fixed. The spacer member 1 includes a frame-like portion 1C facing the top portion 4B and a protruding portion 1P protruding downward (Z2 direction) from the frame-like portion 1C and facing the side plate portion. The magnetic field generating member 5 has a shape extending in a direction orthogonal to the optical axis direction, and is fixed to the side plate portion in a state of being sandwiched between the protruding portion 1P and the side plate portion. With this configuration, the lens driving device 101 can improve the assembling property when the magnetic field generating member 5 is fixed to the cover member 4 made of a nonmagnetic material. This is because, even in the case where the cover member 4 is formed of a nonmagnetic material, the magnetic field generating member 5 is held by the protruding portion 1P in a state of being sandwiched between the protruding portion 1P and the side plate portion.
The protruding portion 1P preferably has a first portion F1 facing the inner surface (surface facing the optical axis JD) of the magnetic field generating member 5 and a second portion F2 facing the side end surface of the magnetic field generating member 5. The magnetic field generating member 5 is disposed so as to be located between the second portions F2 of the pair of protruding portions 1P. For example, as shown in fig. 16A and 16B, the second protrusion 1P2 includes a first portion F1 facing the inner side (Y1 side) of the second magnetic field generating member 5B and a second portion F2 facing the side end surface (X2 side surface) of the second magnetic field generating member 5B. As shown in fig. 18A, the second magnetic field generating member 5B is disposed so as to be located between the second portion F2 of the first protrusion 1P1 and the second portion F2 of the second protrusion 1P 2. According to this structure, the first protrusion 1P1 and the second protrusion 1P2 can suppress movement in the extending direction (X-axis direction) of the second magnetic field generating member 5B. For example, when the upper assembly UA is assembled, the first protruding portion 1P1 and the second protruding portion 1P2 can prevent the second magnetic field generating member 5B held parallel to the second side plate portion 4A2 from moving in the X-axis direction.
The protruding portion 1P is preferably formed in an L-shape in cross section. For example, as shown in fig. 16A and 16B, the second protrusion 1P2 is integrally formed with a first portion F1 and a second portion F2 so that a cross section parallel to the XY plane is substantially L-shaped. With this structure, the protruding portion 1P having high rigidity including the first portion F1 and the second portion F2 is formed.
The magnetic field generating member 5 is preferably composed of a first magnet and a second magnet. The first magnet is disposed closer to the frame portion 1C than the second magnet, and the second magnet is disposed farther from the frame portion 1C than the first magnet. For example, as shown in fig. 15C, the second magnetic field generating member 5B is configured by a second upper magnet 5BU as a first magnet disposed on a side (Z1 side) close to the frame-shaped portion 1C configuring the spacer member 1, and a second lower magnet 5BL as a second magnet disposed on a side (Z2 side) far from the frame-shaped portion 1C. In this configuration, the coil 3 has an elliptical shape having a coil axis perpendicular to the optical axis direction, for example, as shown in fig. 5B. The first magnet and the second magnet each have a different magnetic pole between an inner surface facing the coil 3 and an outer surface facing the side plate portion. The inner surface of the first magnet and the inner surface of the second magnet have different magnetic poles. For example, as shown in fig. 1, the first upper magnet 5AU serving as the first magnet has an inner surface facing the coil 3 magnetized as an S pole and an outer surface facing the first side plate portion 4A1 magnetized as an N pole. The first lower magnet 5AL serving as the second magnet has an inner surface facing the coil 3 magnetized to an N-pole and an outer surface facing the first side plate portion 4A1 magnetized to an S-pole. That is, the inner surface (S pole) of the first upper magnet 5AU as the first magnet and the inner surface (N pole) of the first lower magnet 5AL as the second magnet have different magnetic poles. Similarly, the second upper magnet 5BU serving as the first magnet has an inner surface facing the coil 3 magnetized as an S-pole and an outer surface facing the second side plate portion 4A2 magnetized as an N-pole. The second lower magnet 5BL serving as the second magnet has an inner surface facing the coil 3 magnetized to an N-pole and an outer surface facing the second side plate portion 4A2 magnetized to an S-pole. That is, the inner surface (S pole) of the second upper magnet 5BU as the first magnet and the inner surface (N pole) of the second lower magnet 5BL as the second magnet have different magnetic poles. The protruding portion 1P is configured such that the tip end is located closer to the second magnet than the boundary between the first magnet and the second magnet. For example, as shown in fig. 17C and 17D, the second protruding portion 1P2 is configured such that the tip end thereof is located closer to the second lower magnet 5BL side, i.e., lower side (Z2 side) than the boundary between the second upper magnet 5BU serving as the first magnet and the second lower magnet 5BL serving as the second magnet. In this way, even when the magnetic field generating member 5 is constituted by 2 magnets overlapping in the optical axis direction, the spacer member 1 can sandwich the 2 magnets between the protruding portion 1P and the side plate portion.
The first portion F1 of the protrusion 1P preferably has: a parallel portion PS located on the root side of the protruding portion 1P and substantially parallel to the side plate portion; and a tapered portion TS located closer to the tip end side of the protruding portion 1P than the parallel portion PS, the distance between the tapered portion TS and the side plate portion increasing toward the tip end side of the protruding portion 1P. The boundary BD between the parallel portion PS and the tapered portion TS is preferably configured to face the second magnet. As shown in fig. 16A and 16B, for example, the first portion F1 of the second protruding portion 1P2 includes: the parallel portion PS located closer to the root side of the second protruding portion 1P2 than the taper portion TS, and is substantially parallel to the second side plate portion 4 A2; and a tapered portion TS located closer to the distal end side of the second protruding portion 1P2 than the parallel portion PS, the distance between the tapered portion TS and the second side plate portion 4A2 increasing toward the distal end side of the second protruding portion 1P 2. As shown in fig. 17C and 17D, the boundary BD between the parallel portion PS and the tapered portion TS is located at a position facing the second lower magnet 5BL as the second magnet, that is, the boundary BD is located at a position lower than the lower surface (Z2 side surface) of the second upper magnet 5BU as the first magnet by a distance D1. According to this structure, the magnetic field generating member 5 is guided by the tapered portion TS at the time of assembly, and is easily fitted into the space between the protruding portion 1P and the side plate portion of the outer peripheral wall portion 4A. After being fitted between the protruding portion 1P and the side plate portion, the magnetic field generating member 5 is also supported by the parallel portion PS parallel to the side plate portion, and is thus held in a state parallel to the side plate portion. That is, the parallel portion PS can suppress the magnetic field generating member 5 from tilting with respect to the side plate portion. Therefore, the first magnet and the second magnet constituting the magnetic field generating member 5 are arranged at desired positions between the protruding portion 1P and the side plate portion in desired postures. As a result, the lens driving device 101 can prevent the positional relationship between the coil 3 and the magnetic field generating member 5 from being deviated, and can prevent the thrust for driving the lens holding member 2 from being deviated.
A protrusion PR protruding toward the magnetic field generating member 5 is preferably formed at the root of the second portion F2 of the protruding portion 1P. An adhesive AD is disposed between the second portion F2 below the protrusion PR (Z2 side) and the magnetic field generating member 5. For example, as shown in fig. 17D, a protrusion PR protruding toward the second magnetic field generating member 5B is formed at the root of the second portion F2 of the second protrusion 1P 2. An adhesive AD is disposed between the second portion F2 below the protrusion PR (Z2 side) and the second magnetic field generating member 5B. According to this structure, a gap having at least a width W2 wider than the width W1 of the protrusion PR is formed between the second portion F2 of the second protrusion 1P2 and the second magnetic field generating member 5B. Therefore, the adhesive AD can reliably flow into the gap between the second portion F2 and the second magnetic field generating member 5B. As a result, the adhesive strength between the second protrusion 1P2 and the second magnetic field generating member 5B can be reliably improved.
The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above-described embodiments. The above-described embodiments can be applied to various modifications, substitutions, and the like without departing from the scope of the present invention. The features described with reference to the above embodiments may be appropriately combined as long as they are not technically contradictory.
For example, in the above embodiment, the coil 3 is constituted by 2 elliptical (elliptical-shaped) coils each having a coil axis perpendicular to the optical axis direction, which are held by 2 of the 4 side surfaces of the lens holding member 2. The present invention is not limited to this configuration. The coil 3 may be a ring-shaped coil wound around the lens holding member 2 so as to have a coil axis extending in the optical axis direction. In this case, the magnetic field generating member 5 may be constituted by 4 diode magnets arranged so as to face each of the 4 side plate portions constituting the outer peripheral wall portion 4A.
In the above embodiment, the first magnetic field generating member 5A is constituted by a combination of the first upper magnet 5AU and the first lower magnet 5AL magnetized in the direction perpendicular to the optical axis JD, but may be constituted by 1 diode magnet magnetized in the optical axis direction. In this case, the magnetic pole of the upper portion of the secondary magnet corresponds to the magnetic pole of the inner portion of the first upper magnet 5AU, and the magnetic pole of the lower portion corresponds to the magnetic pole of the inner portion of the first lower magnet 5 AL. The same applies to the second magnetic field generating member 5B.
In the above embodiment, the magnetic field generating member 5 has a substantially rectangular parallelepiped shape and is disposed so as to face the side plate portions constituting the outer peripheral wall portion 4A, but may have a prismatic shape with a trapezoidal bottom surface and be disposed so as to face four corners of the outer peripheral wall portion 4A.
In the above embodiment, the protruding portion 1P of the spacer member 1 is configured to integrally include the first portion F1 and the second portion F2. However, the first portion F1 and the second portion F2 may be configured to extend from the frame-like portion 1C, respectively, and may be arranged at a distance from each other. In this case, the second portion F2 may be omitted. That is, the magnetic field generating member 5 may be held between 1 or more first portions F1 and 1 of the side plate portions in the outer peripheral wall portion 4A by a force of 1 or more first portions F1 pressing the magnetic field generating member 5 against 1 of the side plate portions. In this way, the number of the first portions F1 for holding 1 of the magnetic field generating members 5 may be 1 or 3 or more. In the case where 1 magnetic field generating member 5 is held by 1 first portion F1, the first portion F1 may be arranged so as not to contact the end portions of the magnetic field generating member 5 but to contact the central portion of the magnetic field generating member 5.
The present application claims priority based on japanese patent application No. 2019-138267, filed on 7/26 in 2019, the entire contents of which are incorporated herein by reference.
Description of the reference numerals
Spacer 1C frame 1C2 second extension 1C3 third extension 1C4 fourth extension 1P protrusion 1P2 second protrusion 1P2 third protrusion 1P3 fourth protrusion 1P2 lens holding member 2t protrusion 3A coil 3A 3B second coil 3C connecting portion 4A outer peripheral wall 4A2 first side plate 4A2 second side plate 4A3 third side plate 4A4 fourth side plate 4B top 4s housing 5A first magnetic field generating member 5AU first upper magnet 5AL a lower magnet 5B second magnetic field generating member 5BU second upper magnet 5BL second lower magnet 6 leaf spring 7 metal member 7A first metal member 7AC connection portion 7AT terminal portion 7B second metal member 7BC connection portion 7BT terminal portion 7C third metal member 7C 1-7C 4 end 12 cylindrical portion 12d pedestal portion 12dh recess 12P winding projection 12pA first winding projection 12pB second winding projection 13 winding portion 16 upper plate spring 16B corner portion 16e outside portion 16g elastic arm portion 16i inside portion 16r horizontal bar portion 18 base member 18k opening 18t protrusion 26 26A, the lower leaf spring 26c has an inner engaging portion 26d and an outer engaging portion 26e, and an outer portion 26g, and the elastic arm portion 26h connects the inner portion 26p of the plate portion 26i to the first connecting portion 26q, the second connecting portion 33A, the first extending portion 33B, the second extending portion 33c, the first opposing portion 33k, the second opposing portion 33m, the winding portion 72A, the first retaining portion 72B, the second retaining portion 82B, the dam portion 82s, the inner wall portion 82v of the outer wall portion 82w of the outer wall portion 82z, and the lens driving device AD, and the conductive adhesive F1, the first portion F2, the second portion JD optical axis MK driving mechanism PR, the protrusion PS, and the parallel portion RG, fix the upper assembly of the side member TS.

Claims (8)

1.一种透镜驱动装置，其特征在于，具备：1. A lens driving device, characterized in that it comprises: 包括罩部件的固定侧部件；a fixed side member including a cover member; 透镜保持部件，位于所述罩部件内，能够保持透镜体；A lens holding component, located in the cover component and capable of holding the lens body; 线圈，保持于所述透镜保持部件；a coil held by the lens holding component; 磁场产生部件，与所述线圈对置；以及a magnetic field generating component, opposite to the coil; and 板簧，具有：固定侧支承部，固定于所述固定侧部件；可动侧支承部，固定于所述透镜保持部件；和弹性臂部，设置于所述固定侧支承部与所述可动侧支承部之间，所述板簧将所述透镜保持部件支承为能够沿光轴方向移动，The leaf spring comprises: a fixed side support portion fixed to the fixed side member; a movable side support portion fixed to the lens holding member; and an elastic arm portion provided between the fixed side support portion and the movable side support portion, wherein the leaf spring supports the lens holding member so as to be movable along the optical axis direction. 所述罩部件具有包括相互对置的一对侧板部的外周壁部和顶部，并且由非磁性材料形成，The cover member has an outer peripheral wall portion including a pair of side plates facing each other and a top portion, and is formed of a non-magnetic material. 所述固定侧部件包括间隔部件，该间隔部件的一部分与所述罩部件抵接而配置，并且供所述板簧的所述固定侧支承部固定，The fixed side member includes a spacer member, a part of which is arranged to abut against the cover member and to which the fixed side support portion of the leaf spring is fixed. 所述间隔部件具有：框状部，与所述顶部对置；以及突出部，从所述框状部向下方突出并与所述侧板部对置，The spacer member includes: a frame-shaped portion facing the top portion; and a protruding portion protruding downward from the frame-shaped portion and facing the side plate portion. 所述突出部在所述磁场产生部件的延伸方向上分离地设置有两个，The protrusions are provided in two portions separately from each other in the extending direction of the magnetic field generating component. 所述磁场产生部件呈在与光轴方向正交的方向上延伸的形状，所述磁场产生部件以被夹在两个所述突出部与所述侧板部之间的状态，通过设置在所述侧板部与所述磁场产生部件之间的粘接剂被固定于所述侧板部。The magnetic field generating component is shaped to extend in a direction perpendicular to the optical axis direction, and is fixed to the side plate portion by an adhesive provided between the side plate portion and the magnetic field generating component in a state of being sandwiched between the two protrusions and the side plate portion. 2.根据权利要求1所述的透镜驱动装置，其特征在于，2. The lens driving device according to claim 1, characterized in that: 所述突出部具有与所述磁场产生部件的内侧的面对置的第一部分和与所述磁场产生部件的侧端面对置的第二部分，The protrusion has a first portion facing the inner surface of the magnetic field generating component and a second portion facing the side end surface of the magnetic field generating component. 所述磁场产生部件以位于一对所述突出部各自的第二部分之间的方式配置。The magnetic field generating member is arranged so as to be located between the second portions of the pair of protruding portions. 3.根据权利要求2所述的透镜驱动装置，其特征在于，3. The lens driving device according to claim 2, characterized in that: 所述突出部形成为截面L字状。The protrusion is formed in an L-shaped cross section. 4.根据权利要求2或3所述的透镜驱动装置，其特征在于，4. The lens driving device according to claim 2 or 3, characterized in that: 所述磁场产生部件由第一磁铁及第二磁铁构成，The magnetic field generating component is composed of a first magnet and a second magnet. 所述第一磁铁配置于靠近所述框状部的一侧，所述第二磁铁配置于远离所述框状部的一侧，The first magnet is arranged on a side close to the frame-shaped portion, and the second magnet is arranged on a side away from the frame-shaped portion. 所述线圈呈具有与光轴方向垂直的线圈轴的形状，The coil has a shape having a coil axis perpendicular to the optical axis direction, 所述第一磁铁及所述第二磁铁分别具有在与所述线圈对置的内表面和与所述侧板部对置的外表面间不同的磁极，The first magnet and the second magnet each have different magnetic poles between an inner surface facing the coil and an outer surface facing the side plate. 所述第一磁铁的所述内表面与所述第二磁铁的所述内表面成为不同的磁极，The inner surface of the first magnet and the inner surface of the second magnet have different magnetic poles. 所述突出部构成为，前端位于比所述第一磁铁与所述第二磁铁的边界靠所述第二磁铁侧的位置。The protrusion is configured such that the tip of the protrusion is located closer to the second magnet than the boundary between the first magnet and the second magnet. 5.根据权利要求4所述的透镜驱动装置，其特征在于，5. The lens driving device according to claim 4, characterized in that: 所述第一部分具有：The first part has: 平行部，位于所述突出部的根部侧且与所述侧板部大致平行；和a parallel portion located at the root side of the protruding portion and substantially parallel to the side plate portion; and 锥形部，与所述平行部相比位于所述突出部的前端侧，且所述锥形部与所述侧板部的距离随着趋向所述突出部的前端侧而变大，The tapered portion is located on the front end side of the protruding portion compared to the parallel portion, and the distance between the tapered portion and the side plate portion increases as it approaches the front end side of the protruding portion. 所述平行部与所述锥形部的边界部位于与所述第二磁铁对置的位置。A boundary portion between the parallel portion and the tapered portion is located at a position facing the second magnet. 6.根据权利要求2所述的透镜驱动装置，其特征在于，6. The lens driving device according to claim 2, characterized in that: 在所述第二部分的根部形成有朝向所述磁场产生部件突出的凸部，A convex portion protruding toward the magnetic field generating component is formed at the root of the second portion, 在所述凸部的下方侧处的所述第二部分与所述磁场产生部件之间配置有粘接剂。An adhesive is disposed between the second portion below the convex portion and the magnetic field generating member. 7.根据权利要求1所述的透镜驱动装置，其特征在于，7. The lens driving device according to claim 1, characterized in that: 所述磁场产生部件呈大致长方体形状，并以与所述侧板部对置的方式配置。The magnetic field generating member has a substantially rectangular parallelepiped shape and is disposed so as to face the side plate portion. 8.一种相机模块，具有；8. A camera module, comprising: 权利要求1至7中任一项所述的透镜驱动装置；The lens driving device according to any one of claims 1 to 7; 所述透镜体；以及the lens body; and 与所述透镜体对置的摄像元件。An imaging element is disposed opposite to the lens body.
CN202080053889.3A 2019-07-26 2020-03-10 Lens driving device and camera module Active CN114174917B (en)

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JP2019-138267 2019-07-26
JP2019138267 2019-07-26
PCT/JP2020/010318 WO2021019820A1 (en) 2019-07-26 2020-03-10 Lens driving device and camera module

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