CN108072962B

CN108072962B - Lens driving device

Info

Publication number: CN108072962B
Application number: CN201711095877.3A
Authority: CN
Inventors: 五明英幸; 猿馆彰良; 加藤拓也; 石黑克之; 佐藤清人
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2016-11-11
Filing date: 2017-11-09
Publication date: 2020-09-22
Anticipated expiration: 2037-11-09
Also published as: JP2018077430A; JP6759064B2; CN108072962A

Abstract

The invention provides a lens driving device which can restrain unnecessary vibration and resonance of a lens holding component by a simple and easily manufactured structure. The lower plate spring (17) has an annular holding portion (17a) formed at four corners thereof with through holes (17a1) through which suspension wires (411, 412, 413, 414) are inserted. A vibration damping member (9) that is in contact with both the annular holding portion (17a) and the intermediate portion (85) of the suspension wire (411, 412, 413, 414) is held by the annular holding portion (17 a).

Description

Lens driving device

Technical Field

The present invention relates to a lens driving device, and more particularly to a lens driving device used in a relatively small camera mounted in a mobile phone or the like.

Background

In recent years, demands for high performance and high functionality of cameras mounted on mobile phones and the like have been increasing, and lens driving devices mounted on mobile phones and the like with cameras are required to have not only an autofocus function but also an anti-shake function.

This lens driving device is configured to correct a shake by supporting a conventional AF camera module called a photographing unit (movable module) with 4 suspension wires and driving in 2 axial directions orthogonal to an optical axis.

Specifically, one end of each of the 4 linear suspension wires is fixed to the four corners of the base, and the other end is inserted into a through hole of the upper plate spring and fixed by solder or the like.

However, in such a lens driving device, if unnecessary resonance occurs in the imaging unit in a direction intersecting the optical axis, the operation of preventing the image blur is hindered.

In patent document 1, a vibration damping member for suppressing unnecessary resonance is disposed between a magnet holder and a coil substrate.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-44924

However, in the structure described in patent document 1, the vibration damping member is disposed between the magnet holder (lens driving unit for auto-focusing) and the coil substrate, and in this structure, it is difficult to apply the vibration damping member in a gel state by a dispenser or the like, and there is a problem of low productivity.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a lens driving device capable of suppressing unnecessary vibration and resonance of a movable unit (lens holding member) with a simple and easily manufactured configuration.

In order to achieve the above object, a lens driving device according to the present invention includes: a movable unit including a lens holding member capable of holding a lens body and a1 st driving mechanism for moving the lens holding member in an optical axis direction; a suspension wire provided so as to be exposed from the movable unit while supporting the movable unit so as to be movable in a direction intersecting the optical axis direction; and a2 nd driving mechanism that moves the movable unit in a direction intersecting an optical axis direction, the movable unit including an upper plate spring and a lower plate spring that support the lens holding member so as to be movable in the optical axis direction, and a fixing member that fixes the upper plate spring and the lower plate spring, wherein the movable unit includes an annular holding portion in which a through hole through which the suspension wire is inserted is formed, and a vibration damping member that contacts both the annular holding portion and an intermediate portion of the suspension wire is held by the annular holding portion.

According to this configuration, since the vibration damping member is held by the annular holding portion in which the through hole through which the suspension wire disposed so as to be exposed from the movable unit is inserted is formed, the vibration damping member can be easily applied. Further, the vibration damping member is held by the annular holding portion, so that the holding thereof is reliable.

Preferably, the annular holding portion is provided on at least one of the lower leaf spring and the fixing member.

According to this configuration, since the annular holding portion is provided on at least one of the lower leaf spring and the fixing member, a member having the annular holding portion is not required.

Preferably, at least a part of the annular holding portion is provided in the lower leaf spring, the fixing member has an opposing portion that opposes the suspension wire, and the opposing portion is provided with a holding portion that holds the vibration reduction member together with at least a part of the annular holding portion formed in the lower leaf spring.

According to this configuration, the vibration damping member is held by the holding portion of the fixing member in addition to the portion (at least a part) formed in the annular holding portion of the lower leaf spring, so that the vibration damping member can be reliably held, and the vibration damping function is not easily impaired.

Preferably, the holding portion is located above the annular holding portion formed in the lower leaf spring, protrudes outward from the facing portion, and has 2 protruding portions at least at a distal end portion, and the annular holding portion is provided so as to be exposed between the 2 protruding portions.

According to this configuration, the contact area between the vibration damping member and the holding portion can be increased, and the plurality of vibration damping members can be held by the holding portion and the annular holding portion. Further, since the annular holding portion is exposed between the 2 protruding portions of the holding portion, the vibration damping member can be stably and reliably held by the holding portion and the annular holding portion.

Preferably, the protruding portion has a stepped portion formed such that the upper portion is located at a shorter distance from the opposing portion than the lower portion.

With this configuration, the contact area with the vibration damping member can be further increased.

Preferably, the fixing member has a frame-shaped portion, the opposing portion is provided to extend downward from the frame-shaped portion, the opposing portion has an opposing surface opposing the suspension wire and a mounting surface provided at a lower end portion of the opposing portion and to which the lower leaf spring is fixed, and a fixing portion of the lower leaf spring fixed to the mounting surface is adjacent to the annular holding portion.

According to this configuration, since the annular holding portion is provided at a position adjacent to the fixing portion of the lower leaf spring, even when a strong impact such as a drop is applied, the annular holding portion is not greatly deformed, and the vibration damping member can be prevented from falling off from the holding portion, the annular holding portion, and the like.

Preferably, the vibration damping member is provided at least from the facing surface to the annular holding portion. According to this configuration, since the amount of application of the vibration damping member can be increased, the vibration damping function can be ensured for a long period of time.

Preferably, the opposed surface has a center opposed surface located at the center, and a pair of side opposed surfaces disposed adjacent to both end portions of the center opposed surface in a direction intersecting with an extending direction of the opposed portion, and the pair of side opposed surfaces are opposed to each other.

According to this configuration, since the facing surface of the fixing member is provided to have the center facing surface and the pair of side facing surfaces located on both sides thereof, and the pair of side facing surfaces face each other, a part of the vibration damping member is in contact with the pair of side facing surfaces facing each other, and the vibration damping member can be more reliably held from the facing surface to the annular holding portion.

Preferably, the optical pickup device further includes a housing that houses the movable unit, the housing is formed in a rectangular shape in a plan view along an optical axis direction, and a shape of the through hole in a plan view is a substantially rectangular shape corresponding to the shape of the housing in the plan view.

According to this configuration, since the through hole can be formed in a substantially rectangular shape corresponding to a range in which the movable unit can move in the case, the through hole can be reduced in size, and the vibration damping member can be prevented from easily falling off the through hole.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a lens driving device capable of suppressing unnecessary vibration and resonance of a movable unit (lens holding member) with a simple and easily manufactured configuration.

Drawings

Fig. 1 is an external perspective view of a lens driving device according to an embodiment of the present invention.

Fig. 2 is an exploded perspective view of the lens driving device shown in fig. 1, as viewed from above.

Fig. 3 is an exploded perspective view of the lens driving device shown in fig. 1, as viewed from a lower side thereof.

Fig. 4 is an enlarged side view of the suspension wire shown in fig. 2.

Fig. 5 is a perspective view of the lens driving device shown in fig. 1 with a housing omitted.

Fig. 6 is an enlarged perspective view of the vicinity of the vibration reduction member of the lens driving device shown in fig. 5.

Fig. 7 is an enlarged perspective view of the lens driving device shown in fig. 5 with a vibration reduction member omitted.

Fig. 8 is an enlarged perspective view of the lens driving device shown in fig. 5 with the vibration reduction member and the fixing member omitted.

Fig. 9 is a perspective view of the lens driving device shown in fig. 1, with a housing and a vibration damping member omitted, as viewed from below.

Fig. 10 is a perspective view of the base member shown in fig. 2, 3, and 9.

Fig. 11 is a perspective view of the lower leaf spring shown in fig. 2 and 3.

Fig. 12 is a plan view of the upper leaf spring shown in fig. 2 and 3.

Description of the symbols

1 … lens driving device

3 … lens body

5 … Movable Unit

7 … fixing unit

9 … vibration damping member

11 … base member

13 … coil 2

14 … multilayer substrate

15 … conductive pattern

17 … lower leaf spring

17a … Ring-shaped holding part

17a1 … through hole

17f … outer fixed part (fixed part)

21 … coil 1

23 … lens holding member

25 … magnet

33 … fixing part

33a … opposite part

33a1 … opposite surface

33a11 … central opposite surface

33a12 … side opposite surface

33a2 … mounting surface

33b … holding part

33b1 … projection

33d … frame part

35 … upper leaf spring

37 … baffle

39 … casing

411. 412, 413, 414 … suspension wire

85 … middle part

55 … drive mechanism 1

57 … drive mechanism 2

462. 463 … GMR element

Detailed Description

Hereinafter, a lens driving device according to an embodiment of the present invention will be described.

Fig. 1 is an external perspective view of a lens driving device 1 according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the lens driving device 1 shown in fig. 1 as viewed from above. Fig. 3 is an exploded perspective view of the lens driving device 1 shown in fig. 1 as viewed from below. Fig. 4 is an enlarged side view of the

suspension wires

411, 412, 413, 414 shown in fig. 2. Fig. 5 is a perspective view of the lens driving device 1 shown in fig. 1 with the housing 39 omitted. Fig. 6 is an enlarged perspective view of the vicinity of the vibration reduction member 9 of the lens driving device 1 shown in fig. 5. Fig. 7 is an enlarged perspective view of the lens driving device 1 shown in fig. 5 with the vibration control member 9 omitted. Fig. 8 is an enlarged perspective view of the lens driving device 1 shown in fig. 5 with the vibration reduction member 9 and the fixing member 33 omitted.

For easy understanding, fig. 1 shows a state in which the lens body 3 is attached to the lens holding member 23. In fig. 2 and 3, the arrangement of the components is illustrated, and therefore, the shapes of some of the components (the lower leaf spring 17, the upper leaf spring 35, and the like) are simplified and illustrated.

As shown in fig. 1 to 8, the lens driving device 1 includes, for example, a base member 11, a2 nd coil 13, a conductive pattern 15, a lower plate spring 17, a1 st coil 21, a

lens holding member

23, 4 magnets (permanent magnets) 25, a fixing member 33, an upper plate spring 35, a spacer (top cover) 37, a

case

39, 4

suspension wires

411, 412, 413, 414, a vibration damping member 9, and the like. The conductive pattern 15 is integrally formed on the base member 11 by plating, but for convenience, both are shown separately in fig. 2 and 3.

Here, the spacer 37, the upper plate spring 35, the fixing member 33, the magnet 25, the lens holding member 23, the 1 st coil 21, and the lower plate spring 17 constitute the movable unit 5.

The base member 11 on which the conductive pattern 15 is formed and the 2 nd coil 13 constitute a fixing unit 7.

The lower plate spring 17, the 1 st coil 21, the magnet 25, the fixing member 33, and the upper plate spring 35 constitute a1 st driving mechanism 55 for moving the lens holding member 23 holding the lens body 3 (lens barrel) in the optical axis direction (Z1-Z2 direction) of the lens body 3.

The 2 nd coil 13 and the magnet 25 constitute a2 nd driving mechanism 57 for moving the movable unit 5 in a direction (X1-X2, Y1-Y2 direction) intersecting (orthogonal to) the optical axis direction.

In fig. 1 to 3 and 5, the upper Z1 side is an object side on which an object to be photographed by the camera is present, the object being mounted on the lens driving device 1. The Z2 side shown on the lower side is an image pickup side where the image pickup device facing the lens body 3 is arranged.

The lens driving device 1 has an auto-focus function and an anti-shake function.

The autofocus function is a function of adjusting the focus by moving the lens holding member 23 holding the lens body 3 in the optical axis direction (Z1-Z2 direction) based on the captured image. The autofocus function is mainly realized by the 1 st coil 21, the magnet 25, the fixing member 33, the lower plate spring 17, the upper plate spring 35, and the like.

The anti-shake function is a function of correcting shake generated during photographing based on the position information of the movable unit 5 (lens holding member 23) detected by the

GMR elements

462 and 463, and making it possible to take an image without image deviation. In the anti-shake function, the lens holding member 23 and the like are moved in the X1-X2 and Y1-Y2 directions intersecting the optical axis direction as described later.

The anti-shake function is mainly constituted by the 2 nd coil 13, the magnet 25, the

suspension wires

411, 412, 413, 414, and the like.

In the lens driving device 1, the

suspension wires

411, 412, 413, 414 disposed outside the fixed member 33 support the movable unit 5 so that the lens holding member 23 can move in the anti-shake direction (X1-X2, Y1-Y2 direction) intersecting the optical axis direction (Z1-Z2 direction). The

suspension wires

411, 412, 413, 414 are disposed around the movable unit 5 in a state of being exposed from the movable unit 5.

As shown in fig. 4, the intermediate portion 85 located near the middle of the ends of the

suspension wires

411, 412, 413, 414 contacts the damping member 9. The damping member 9 is held by a holding portion 33b provided in the opposing portion 33a of the fixing member 33 and an annular holding portion 17a of the lower leaf spring 17 (see fig. 5 to 7).

In the lens driving device 1, the vibration reduction member 9 held by the holding portion 33b and the annular holding portion 17a is in contact with the intermediate portion 85 of the

suspension wires

411, 412, 413, and 414, and vibration of the movable unit 5 supported by the

suspension wires

411, 412, 413, and 414 in a direction intersecting the optical axis direction is suppressed, so that resonance can be avoided and vibration can be appropriately prevented. Further, since the damping member 9 is provided in a portion where there are few components near the intermediate portion 85 of the

suspension wires

411, 412, 413, 414 arranged around the fixing member 33, the damping member 9 can be easily provided in the manufacturing process, and high productivity can be obtained.

Hereinafter, the configuration and operation of the lens driving device 1 will be described in detail.

The lens holding member 23 capable of holding the lens body 3 is elastically supported by the lower plate spring 17 and the upper plate spring 35 from both sides in the Z1-Z2 direction. The lens body 3 is held (fixed) to the inner periphery of the lens holding member 23 formed in a cylindrical shape by means of an adhesive, a screw clamp, or the like.

As shown in fig. 8, the 1 st coil 21 is fixed (held) to the outer periphery of the lens holding member 23. The 1 st coil 21 is formed by winding a wire around the outer periphery of the lens holding member 23. When the 1 st coil 21 is energized, an electromagnetic force is generated by an electromagnetic interaction between the current flowing through the 1 st coil 21 and the magnetic field from the magnet 25, so that the 1 st coil 21 and the lens holding member 23 are integrated and moved in the Z1-Z2 direction (optical axis direction). Thereby, an autofocus function is realized.

The 2 nd coil 13 is provided with 4 coils in point symmetry in the vicinity of the center of each side of the rectangle of the base member 11 along the X1-X2 and Y1-Y2 planes. The 2 nd coil 13 is formed of a multilayer substrate 14 in which a plurality of sheet-like base materials each having a spiral conductive pattern formed thereon and extending in the direction along each side of the base member 11 are stacked, and the multilayer substrate 14 is fixed to the base member 11 with an adhesive. The magnetic field from magnet 25 traverses coil 2 13. Therefore, when the 2 nd coil 13 is energized, an electromagnetic force for moving the entire movable unit 5 in the directions X1-X2 and Y1-Y2 is generated by an electromagnetic interaction between the current flowing through the 2 nd coil 13 and the magnetic field from the magnet 25. Thereby, the anti-shake function is realized. The plate-shaped magnet 25 is magnetized so that the inner surface facing the 1 st coil 21 and the outer surface opposite thereto have different magnetic poles.

Fig. 9 is a perspective view of the lens driving device 1 shown in fig. 1, as viewed from below, with the housing 39 and the vibration damping member 9 omitted. Fig. 10 is a perspective view of the base member 11. Fig. 11 is a perspective view of the lower leaf spring 17. Fig. 12 is a plan view of the upper leaf spring 35.

The base member 11 is formed by molding an insulating resin material, for example, and is formed in a rectangular shape.

A circular opening 11k is formed near the center of the base member 11 at a position corresponding to an image sensor, not shown.

A positioning portion for positioning the 2 nd coil 13 (multilayer substrate 14) is provided at a predetermined position on each of the 4 sides of the base member 11. As shown in fig. 10, four fixing portions 11a for fixing the multilayer substrate 14 constituting the 2 nd coil 13 with an adhesive are formed on the upper surface of the base member 11. In the annular recess formed so as to surround each fixing portion 11a, an excess adhesive is accommodated.

GMR elements

462 and 463 shown in fig. 2 and 3 are mounted on the lower surface of the multilayer substrate 14 constituting the 2 nd coil 13. The base member 11 is provided with an accommodation recess 11b accommodating the

GMR elements

462 and 463.

As shown in fig. 9 and 10, the base member 11 is formed with a conductive pattern 15 by plating. The conductive pattern 15 is formed on the upper surface and the lower surface of the base member 11 and on the inner peripheral surface of the opening 11 k. Further, through holes 11c are formed in 4 corners of the base member 11, and a connection portion 151 that is electrically connected to a part of the conductive pattern 15 is formed on an inner peripheral surface of the through holes 11c and its periphery. The connection portion 151 is a part of the conductive pattern 15, and is formed by plating in the same manner as the conductive pattern 15.

As shown in fig. 5 to 8 and 4, lower end portions (one end portions) of the

suspension wires

411, 412, 413, and 414 extending in the Z1-Z2 direction as the optical axis are inserted into and fixed to the through hole 11c of the base member 11. This fixation is performed by soldering to the connection portion 151, but may be performed by a conductive adhesive or the like. As shown in fig. 9, a fillet weld (retainer filet) 153 for fixing the lower ends (one ends) of the

suspension wires

411, 412, 413, 414 is formed on the lower surface of the connection portion 151.

The conductive pattern 15 is electrically separated into a plurality of patterns, and some (12 in the present embodiment) of the plurality of patterns are electrically connected to a wiring pattern (not shown) formed on the multilayer substrate 14 constituting the 2 nd coil 13 by soldering. This allows a current to flow to the 2 nd coil 13 through the conductive pattern 15, or allows the

GMR elements

462 and 463 mounted on the multilayer substrate 14 to obtain an output. The plurality of conductive patterns 15 are led out to the lower surface of the base member 11 to form terminal portions 15 a. Current can flow from 2 of the terminal portions 15a to the 1 st coil 21.

As shown in fig. 4, 7, and 8, the

suspension wires

411, 412, 413, and 414 are formed in an elongated substantially cylindrical shape and in a linear shape. The upper ends (the other ends) of the

suspension wires

411, 412, 413, and 414 are inserted into holes 35g (see fig. 12) formed at the 4-corner of the upper leaf spring 35 and fixed by soldering. The

suspension wires

411, 412, 413, 414 are formed of a metal material having elastic conductivity, for example, a copper alloy. As will be described later, the

suspension wires

411 and 412 are also used for feeding the 1 st coil 21.

Hereinafter, the

suspension wires

411, 412, 413, 414 and the mechanism for suppressing vibration and resonance in the direction intersecting the optical axis direction of the movable unit 5 will be described in detail.

As described above, the

suspension wires

411, 412, 413, and 414 have lower ends fixed to the connection portions 151 of the conductive patterns 15 formed on the base member 11, and upper ends fixed to the upper leaf springs 35, and support the movable unit 5 so as to be movable in the direction X, Y.

As shown in fig. 5 and 6, the intermediate portion 85 located between the upper end portions and the lower end portions of the

suspension wires

411, 412, 413, and 414 penetrates the vibration damping member 9 in a state of being in contact with the vibration damping member 9. In other words, the intermediate portions 85 of the suspension wires 411 to 414 are embedded in the damping member 9.

As shown in fig. 7, 8 and 11, the lower leaf spring 17 has an annular holding portion 17a having a through hole 17a1 formed at the 4-corner, and the

suspension wires

411, 412, 413 and 414 are inserted through the through holes 17a 1. The through hole 17a1 has a shape in plan view as viewed from the optical axis direction corresponding to the shape (rectangular shape) of the case 39 in plan view, and is formed in a quadrangular shape. The annular holding portion 17a is a portion surrounding the entire circumference of the through hole 17a1, and holds the vibration damping member 9.

As shown in fig. 5, the damping member 9 is provided in contact with both the annular holding portion 17a and the intermediate portion 85 of the

suspension wires

411, 412, 413, 414.

As shown in fig. 5, 6, and 7, the annular holding portion 17a is provided on the lower leaf spring 17. The fixing member 33 has 4 opposed portions 33a opposed to the

suspension wires

411, 412, 413, 414 arranged around the fixing member 33. The opposing portion 33a is provided with a holding portion 33b that is positioned above the annular holding portion 17a and holds the vibration damping member 9 together with the annular holding portion 17 a. The holding portion 33b is an upper holding portion disposed to overlap with an upper side of the annular holding portion 17a located below the holding portion.

The holding portion 33b protrudes outward from the opposing portion 33a, and has 2 protruding portions 33b1 at least at the distal end portion. The annular holding portion 17a is provided to be exposed from between the 2 protruding portions 33b 1.

As shown in fig. 7, the protruding portion 33b1 has a stepped portion 33c in which the distance from the opposing portion 33a is formed shorter in the upper portion (Z1 side) than in the lower portion (Z2 side). The configuration of the holding portion 33b is not limited to this, and the 2 protruding portions 33b1 may be formed in a ring shape with their leading ends connected to each other.

As shown in fig. 2 and 3, the fixing member 33 has a substantially rectangular (more strictly octagonal) frame-shaped portion 33d on which the upper leaf spring 35 is disposed (placed), and an opposing portion 33a having a columnar shape is provided so as to extend downward from a corner of the frame-shaped portion 33 d. The fixing member 33 is formed of a synthetic resin material.

As shown in fig. 7, the opposing portion 33a has an opposing surface 33a1 (side surface) that opposes the

suspension wires

411, 412, 413, 414, and a mounting surface 33a2 (see fig. 3) that is provided at the lower end portion of the opposing portion 33a and to which the lower leaf spring 17 (outer fixing portion 17f) is fixed. The mounting surface 33a2 is provided with a boss projecting downward.

The damping member 9 is provided at least from the facing surface 33a1 to the annular holding portion 17 a. The fixing portion (outer fixing portion 17f) of the lower leaf spring 17 fixed to the mounting surface 33a2 shown in fig. 3 is adjacent to the annular holding portion 17 a.

The facing surface 33a1 includes a flat center facing surface 33a11 positioned at the center, and a pair of side facing surfaces 33a12 arranged adjacent to both ends of the center facing surface 33a11 in the direction intersecting the extending direction of the facing portions 33a (the optical axis direction, Z1-Z2 direction).

The pair of side facing surfaces 33a12 are formed to face (oppose) each other. That is, the side opposing surfaces 33a12 and the center opposing surface 33a11 have an angle so that the pair of side opposing surfaces 33a12 face each other.

The damping member 9 is provided in a gel-like shape as shown in fig. 5 and 6, and is applied to the vicinity of the intermediate portion 85 of the

suspension wires

411, 412, 413, 414 by a dispenser or the like in the manufacturing process. The applied vibration damping member 9 enters the through hole 17a1 of the annular holding portion 17a by surface tension and is held, and then is cured by irradiation with ultraviolet rays or the like. A part of the vibration damping member 9 also contacts the lower surface of the annular holding portion 17 a. The vibration damping member 9 is made of a gel-like resin having ultraviolet curing properties, and for example, silicone gel (product name: TB3168E) manufactured by ThreeBond (inc.).

As described above, by supporting the vibration damping member 9 by the annular holding portion 17a, the vibration damping member 9 can be disposed at a predetermined position in the design with high accuracy, and the vibration suppression effect by the vibration damping member 9 is improved. Further, the vibration damping member 9 can be stably held by the annular holding portion 17a, and even if a strong impact such as dropping is applied, the vibration damping member 9 can be made less likely to fall off from the annular holding portion 17a and the like.

In the present embodiment, since the vibration reduction member 9 is provided so as to surround the intermediate portion 85 of the

suspension wires

411, 412, 413, 414, even when vibration in a direction intersecting the optical axis direction is generated in the movable unit 5 (lens holding member 23), the vibration reduction member 9 can be retained around the

suspension wires

411, 412, 413, 414, and the vibration suppression effect can be maintained.

As shown in fig. 12, the upper plate spring 35 includes a1 st upper plate spring 35a and a2 nd upper plate spring 35b formed of electrically separated conductive metal plates. The 1 st upper leaf spring 35a and the 2 nd upper leaf spring 35b are each formed in a substantially U shape so as to form a frame shape as a whole, and each have an outer portion 35c, an inner portion 35d located inside the outer portion 35c and fixed to the upper portion of the lens holding member 23, and an elastic arm portion 35e provided between the inner portion 35d and the outer portion 35 c. The outer portion 35c is connected to the cable fixing portion 35f formed with the aforementioned hole 35 g.

The outer portion 35c constituting the outer fixing portion of the upper leaf spring 35 is sandwiched between the fixing member 33 (frame portion 33d) and the partition plate 37, which are 2 frame-shaped members, and fixed by an adhesive. The inner portion 35d as the inner fixing portion is fixed to the lens holding member 23 by inserting a boss provided on the upper portion of the lens holding member 23 into a plurality of mounting holes 35h formed in the inner portion 35d and crushing (caulking) the tip of the boss.

In addition, one end of the 1 st coil 21 shown in fig. 3 is conductively connected to the 1 st upper plate spring 35a via a wire 87, and the other end of the 1 st coil 21 is conductively connected to the 2 nd upper plate spring 35b via a wire 89.

With this configuration, the suspension wire 411 is electrically connected to one end of the 1 st coil 21, and the suspension wire 412 is electrically connected to the other end of the 1 st coil 21, so that power can be supplied to the 1 st coil 21.

As shown in fig. 2 and 5, the 2 nd coil 13 having an elongated shape is disposed on each of the 4 sides of the base member 11. As described above, the 4 nd coils 13 are formed along the sides of the multilayer substrate 14 formed in a rectangular shape. Further, by adopting the structure in which the 1 multilayer substrate 14 is fixed to the base member 11, the positioning of the 2 nd coil 13 becomes easy, and the manufacturing process can be simplified. Both ends of each 2 nd coil 13 are electrically connected to the conductive pattern 15 formed on the base member 11 via solder.

The magnetic field from magnet 25 traverses coil 2 13. Therefore, an electromagnetic force capable of moving the entire movable unit 5 in the X direction, the Y direction, or a direction between the X direction and the Y direction is generated by an electromagnetic interaction between the current flowing through the 2 nd coil 13 and the magnetic field from the magnet 25.

In the present embodiment, the 2 nd coil 13 is a multilayer substrate (laminated coil) formed by laminating a plurality of sheet-like base materials each having a conductive pattern formed in a spiral shape, but a coil in which a conductive wire is wound may be used.

As shown in fig. 11, the lower plate spring 17 made of a metal plate includes an annular

inner portion

17b, 4 outer portions 17c located on the outer side (outer peripheral side) of the

inner portion

17b, and 4 elastic arm portions 17d provided between the inner portion 17b and the outer portions 17 c. In the outer portion 17c, the annular holding portion 17a is provided adjacent to the outer fixing portion 17 f. The outer fixing portion 17f is located closer to the elastic arm portion 17d than the annular holding portion 17a, and is formed with a mounting hole 17f 1. The lower leaf spring 17 has an outer fixing portion 17f fixed to the mounting surface 33a2 of the fixing member 33 shown in fig. 3. The fixing is performed by riveting. The caulking is performed by crushing the boss of the mounting surface 33a2 inserted into the mounting hole 17f1 from the front end side.

Further, 4 inner fixing portions 17e provided at the inner portion 17b of the lower plate spring 17 are fixed to a lower portion of the lens holding member 23 with an adhesive.

In the present embodiment, since the lower plate spring 17 and the upper plate spring 35 are fixed to the fixing member 33 which is the same member, the lens holding member 23 can be made less likely to tilt with respect to the optical axis (Z1-Z2 direction).

As shown in fig. 2 and 3, the 1 st coil 21 has a substantially rectangular shape (more strictly, an octagonal shape), and is wound around and fixed to the outer periphery of the lens holding member 23. The 1 st coil 21 is fed with power through the

suspension wires

411 and 412 as described above.

Further, outside the lens holding member 23, there are 4 magnets 25 facing 4 sides of the 1 st coil 21 with gaps, respectively.

The fixing member 33 is formed of an insulating resin or the like, and is fixed to the upper plate spring 35 and the partition plate 37.

The fixing member 33 has a frame-shaped portion 33d formed in a polygonal shape (substantially rectangular body) and an opposing portion 33a positioned at a 4-corner. The opposing portion 33a is formed by a leg portion protruding downward from the frame-shaped portion 33d at a corner of the substantially rectangular frame-shaped portion 33 d.

The magnet 25 is disposed so as to be positioned between the adjacent facing portions 33a (leg portions), and is fixed to the side surfaces of the facing portions 33a with an adhesive. Thereby, the magnet 25 and the fixing member 33 are integrated.

As shown in fig. 1 to 3, the outer shape (outline) of the case 39 is formed in a rectangular shape having 2 sides extending in the X direction and 2 sides extending in the Y direction in a plan view as viewed from the optical axis direction, and is formed in a box shape with a lower side (Z2 direction side) opened. The case 39 is formed by drawing a nonmagnetic metal plate, for example. The housing 39 has a rectangular top portion 39a having an opening 39k for exposing the

lens body

3, and 4 flat side wall portions 39b extending downward from the outer edge of the top portion 39 a. The adjacent

side wall portions

39b, 39b have an arc shape generated when the case 39 is machined. The case 39 covers the base member 11 so as to house the movable unit 5, the multilayer substrate 14, and the like, and is fixed to the base member 11 with an adhesive.

The movable unit 5 supported by the

suspension wires

411, 412, 413, and 414 can move in a direction intersecting the optical axis direction, but the amount of movement is limited by a part of the movable unit 5 abutting against the housing 39 (the inner surface of the side wall portion 39 b). This can prevent plastic deformation and breakage of the

suspension wires

411, 412, 413, 414.

As described above, the through hole 17a1 of the lower leaf spring 17 through which the

suspension wires

411, 412, 413, 414 are inserted has a rectangular quadrilateral shape (rectangular shape or square shape) corresponding to the shape (rectangular shape) of the case 39 in plan view. That is, the 4 sides (inner edge portion of the annular holding portion 17a) constituting the through hole 17a1 are formed substantially parallel to the 4 side wall portions 39b of the case 39. In the rectangular shape of the through hole 17a1, the ratio of the length of the side extending in the X direction to the length of the side extending in the Y direction is set to be approximately the same as the ratio of the length of the side wall portion 39b extending in the X direction to the length of the side wall portion 39b extending in the Y direction. The through hole 17a1 is formed in such a size that the

suspension wires

411, 412, 413, 414 do not abut against the inner edge portion of the annular holding portion 17a when the movable unit 5 abuts against the housing 39. That is, the through holes 17a1 are formed to have a slight margin so that the

suspension wires

411, 412, 413, 414 are not undesirably deformed.

The operation of the lens driving device 1 will be described below.

[ automatic focusing ]

In the autofocus operation, a current is supplied to the 1 st coil 21 to adjust the focus based on a captured image corresponding to the imaging result of light incident on the image sensor via the lens body 3.

Then, an electromagnetic force is generated by an electromagnetic interaction between the current flowing through the 1 st coil 21 and the magnetic field from the magnet 25, so that the 1 st coil 21 and the lens holding member 23 are integrated and moved in the optical axis direction (Z1-Z2 direction).

[ anti-shaking ]

In the anti-shake operation, the 2 nd coil 13 is energized based on the position information detected by the

GMR elements

462, 463 and the like. The 2 nd coil 13 is configured to be able to supply current to a pair of coils extending in the X1-X2 direction and a pair of coils extending in the Y direction independently.

When the 2 nd coil 13 is energized, an electromagnetic force for moving the lens holding member 23 and the movable unit 5 as a whole in the X1-X2 and 1-Y2 directions is generated by an electromagnetic interaction between the current flowing through the 2 nd coil 13 and the magnetic field from the magnet 25. The movable unit 5 supported by the

suspension wires

411, 412, 413, 414 moves in the anti-shake direction (X1-X2, Y1-Y2 direction) orthogonal to the optical axis direction (Z direction).

At this time, the intermediate portions 85 of the

suspension wires

411, 412, 413, 414 come into contact with the vibration reduction member 9 held by the annular holding portion 17a, so that the lens holding member 23 and the movable unit 5 can be prevented from vibrating and resonating. This enables appropriate anti-shake.

As described above, according to the lens driving device 1, the vibration reduction member 9 is provided to be in contact with both the annular holding portion 17a and the intermediate portion 85 of the

suspension wires

411, 412, 413, and 414.

The damping member 9 is held by the annular holding portion 17a formed with the through hole 17a1 through which the

suspension wires

411, 412, 413, 414 are inserted, and the

suspension wires

411, 412, 413, 414 are exposed from the movable unit 5, so that the damping member 9 is easily applied. Further, the damping member 9 is held by the annular holding portion 17a, so the holding is reliable.

Further, according to the lens driving device 1, since the annular holding portion 17a is provided in the lower plate spring 17, a member having the annular holding portion 17a is not required separately.

Further, according to the lens driving device 1, as shown in fig. 7, the annular holding portion 17a is provided on the lower plate spring 17, the fixing member 33 has the opposing portion 33a opposing the

suspension wires

411, 412, 413, 414, and the opposing portion 33a is provided with the holding portion 33b positioned above the annular holding portion 17a and holding the vibration damping member 9 together with the annular holding portion 17 a. Therefore, as shown in fig. 6, since the damping member 9 is held by the annular holding portion 17a of the lower leaf spring 17 and the holding portion 33b of the fixing member 33, more damping members 9 can be reliably held, and the damping function is not easily impaired. Further, since the annular holding portion 17a is provided in the lower leaf spring 17, the annular holding portion 17a can be obtained more easily than a case where the annular holding portion is provided in a synthetic resin member by molding. That is, since the fixing member 33 (the opposing portion 33a) is made of resin, it is difficult to obtain a thin annular portion by molding, but since the lower plate spring 17 is made of metal, it can be easily formed into an annular shape.

In the lens driving device 1, as shown in fig. 7, the holding portion 33b protrudes outward from the facing portion 33a, and is configured to have 2 protruding portions 33b1 at least at the distal end portion, and the annular holding portion 17a is provided so as to be exposed from between the 2 protruding portions 33b 1. Therefore, the contact area between the vibration damping member 9 and the holding portion 33b can be increased, and a large number of vibration damping members 9 can be held by the holding portion 33b and the annular holding portion 17 a. Further, since the annular holding portion 17a is provided so as to be exposed between the 2 protruding portions 33b1 of the holding portion 33b, the vibration damping member 9 can be stably and reliably held by the holding portion 33b and the annular holding portion 17 a.

Further, according to the lens driving device 1, the protruding portion 33b1 has the step portion 33c in which the distance from the opposing portion 33a is formed shorter in the upper portion than in the lower portion. Therefore, the contact area with the vibration damping member 9 can be further increased.

In the lens driving device 1, as shown in fig. 7, the fixing member 33 has a frame-shaped portion 33d in which the upper leaf spring 35 is disposed, and the opposing portion 33a is provided to extend downward from the frame-shaped portion 33 d. The facing portion 33a has a facing surface 33a1 (side surface) facing the

suspension wires

411, 412, 413, and 414, and a mounting surface 33a2 shown in fig. 3 provided at the lower end of the facing portion 33a and to which the lower leaf spring 17 is fixed. The damping member 9 is provided at least from the facing surface 33a1 to the annular holding portion 17 a. Further, a fixing portion (outer fixing portion 17f) of the lower leaf spring 17 fixed to the mounting surface 33a2 is adjacent to the annular holding portion 17 a.

With this configuration, the amount of application of the vibration damping member 9 can be increased, and therefore the vibration damping function can be ensured for a long period of time. Further, since the annular holding portion 17a is provided at a position adjacent to the fixing portion (outer fixing portion 17f) of the lower leaf spring 17, the annular holding portion 17a is not largely deformed even when a strong impact such as dropping is applied thereto, and the vibration damping member 9 can be prevented from falling off from the holding portion 33b, the annular holding portion 17a, and the like.

In the lens driving device 1, the facing surface 33a1 includes a center facing surface 33a11 positioned at the center, and a pair of side facing surfaces 33a12 arranged adjacent to both ends of the center facing surface 33a11 in the direction intersecting the extending direction (optical axis direction) of the facing portion 33 a. The pair of side facing surfaces 33a12 are formed to face (oppose) each other.

According to this configuration, since the opposed surface 33a1 of the fixing member 33 is provided to have the center opposed surface 33a11 and the pair of side opposed surfaces 33a12 positioned on both sides thereof, and the pair of side opposed surfaces 33a12 are opposed to each other, a part of the damper member 9 is in contact with the pair of side opposed surfaces 33a12 opposed to each other, and the damper member 9 provided from the opposed surface 33a1 to the annular holding portion 17a can be held more reliably.

The lens driving device 1 further includes a housing 39 that houses the movable unit 5 and has a rectangular shape in a plan view, and the through hole 17a1 of the annular holding portion 17a has a substantially rectangular shape in a plan view corresponding to the planar shape of the housing 39.

With this configuration, since the through hole 17a1 can be formed in a substantially rectangular shape corresponding to the range in which the movable unit 5 can move within the housing 39, the through hole 17a1 can be reduced in size, and the damping member 9 can be made less likely to fall off the through hole 17a 1. Further, since the annular holding portion 17a forming the through hole 17a1 is also formed to be small, the lens driving device 1 can be made smaller than a case where the through hole is formed to be circular, for example.

The present invention is not limited to the above-described embodiments.

That is, those skilled in the art can make various modifications, combinations, sub-combinations, and substitutions to the components of the above-described embodiments within the technical scope of the present invention or equivalent scope thereof.

In the above-described embodiment, the case where the annular holding portion 17a is provided in the lower plate spring 17 has been exemplified, but the annular holding portion may be provided in the fixed member 33 or another member. Further, the annular holding portions may be provided on both the lower leaf spring 17 and the fixing member 33.

The annular holding portion (17a) is a portion surrounding the through hole (17a1), but the entire circumference of the through hole need not be completely surrounded, and a portion of the annular holding portion may be interrupted as long as the applied vibration damping member 9 can be held. However, in this case, the ring-shaped holding portion located farther from the optical axis is also continuously formed with the suspension wire as a reference.

Further, although the case where the holding portion 33b is provided in the fixing member 33 is exemplified, the vibration damping member 9 may be held only by the annular holding portion 17a without providing the holding portion 33 b.

The shape of the through hole 17a1 of the annular holding portion 17a may be other than a rectangle.

In the above-described embodiment, the annular holding portion 17a is formed only by the lower leaf spring 17, but an annular holding portion for holding the damper member 9 may be formed by the lower leaf spring 17 and the fixing member 33. That is, for example, the through hole 17a1 of the lower leaf spring 17 is continuous with the mounting hole 17f1, and the outer peripheral side distant from the optical axis of the suspension wire faces a part of the lower leaf spring 17 (outer holding portion), and the inner peripheral side close to the optical axis faces a holding portion formed at the opposing portion of the fixed member 33 (inner holding portion), and the outer holding portion and the inner holding portion constitute an annular holding portion. In either case, the outer holding portion facing the suspension wire is formed as at least a part of the annular holding portion on the outer peripheral side of the lower plate spring, which is distant (distant) from the optical axis of the suspension wire.

In the above-described embodiment, the case where 4

suspension wires

411, 412, 413, and 414 are used has been exemplified, but the number of suspension wires is not particularly limited.

In the above-described embodiment, the case where the intermediate portion 85 of 1

suspension wire

411, 412, 413, 414 is in contact with 1 damping member 9 has been described as an example, but the suspension wires may be in contact with a plurality of damping members 9 at different positions other than the intermediate portion or the intermediate portion.

Further, a plurality of the annular holding portions 17a and the vibration attenuating members 9 may be provided at different positions in the Z direction for 1

suspension wire

411, 412, 413, 414.

The member of the vibration damping member 9 is not limited to a gel-like member as long as it has vibration absorbability.

In the above-described embodiment, the 1 st upper plate spring 35a and the 2 nd upper plate spring 35b are physically separated, but may be configured as a single module as long as they are electrically separated.

In the above-described embodiment, the magnet 25 is used in common between the 1 st drive mechanism 55 (autofocus mechanism) and the 2 nd drive mechanism 57 (anti-shake mechanism), but a configuration may be adopted in which different magnets are used in correspondence with each other.

In the above-described embodiment, the other end portions of the

suspension wires

411, 412, 413, and 414 are fixed to the upper leaf spring 35, but may be fixed to the fixing member 33.

Industrial applicability of the invention

The present invention can be applied to a lens driving device using a suspension wire.

Claims

1. A lens driving device is provided with:

a movable unit including a lens holding member capable of holding a lens body and a1 st driving mechanism for moving the lens holding member in an optical axis direction; a suspension wire provided so as to be exposed from the movable unit while supporting the movable unit so as to be movable in a direction intersecting the optical axis direction; and a2 nd driving mechanism for moving the movable unit in a direction intersecting the optical axis direction,

the movable unit includes an upper plate spring and a lower plate spring that support the lens holding member so as to be movable in an optical axis direction, and a fixing member that fixes the upper plate spring and the lower plate spring,

the lens driving device is characterized in that,

a housing for accommodating the movable unit, wherein the housing is formed in a rectangular shape in a plan view along an optical axis direction, a shape of the through hole in a plan view is a substantially quadrangular shape corresponding to the shape of the housing in the plan view,

the movable unit has an annular holding portion formed with the through hole through which the suspension wire is inserted,

a vibration damping member that contacts both the annular holding portion and the intermediate portion of the suspension wire is held by the annular holding portion,

at least a part of the annular holding portion is provided in the lower plate spring, the fixing member has an opposing portion that opposes the suspension wire, and the opposing portion is provided with a holding portion that holds the damping member together with at least a part of the annular holding portion formed in the lower plate spring,

the holding portion is located above the annular holding portion formed on the lower leaf spring, protrudes outward from the facing portion, and has 2 protruding portions at least at a distal end portion, and the annular holding portion is provided so as to be exposed between the 2 protruding portions.

2. The lens driving device according to claim 1,

the protruding portion has a stepped portion in which the upper portion is formed to have a shorter distance from the opposing portion than the lower portion.

3. The lens driving device according to claim 1 or 2,

the fixing member has a frame-shaped portion, and the opposing portion is provided to extend downward from the frame-shaped portion, the opposing portion has an opposing surface opposing the suspension wire, and a mounting surface provided at a lower end portion of the opposing portion and to which the lower leaf spring is fixed, and a fixing portion of the lower leaf spring fixed to the mounting surface is adjacent to the annular holding portion.

4. The lens driving device according to claim 3,

the vibration damping member is provided at least from the facing surface to the annular holding portion.

5. The lens driving device according to claim 4,

the facing surface is formed to have a center facing surface positioned at the center and a pair of side facing surfaces arranged adjacent to both end portions of the center facing surface in a direction intersecting with an extending direction of the facing portions, and the pair of side facing surfaces face each other.