JP2018077430A - Lens driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens driving device which can easily suppress generation of vibration or resonance unnecessary for a lens holding member by an easily obtained structure.SOLUTION: A lower plate spring 17 has a ring-shaped holding part 17a at four corners, the holding part having a through-hole 17a1 through which suspension wires 411, 412, 413, and 414 are inserted. A damper member 9 is held by the ring-shaped holding part 17a to be in contact with the ring-shaped holding part 17a and an intermediate part 85 of suspension wires 411, 412, 413, and 414.SELECTED DRAWING: Figure 8

Description

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

In recent years, there has been a demand for higher performance and higher functionality of cameras mounted on mobile phones and the like, and lens driving devices mounted on mobile phones with cameras have not only an autofocus function but also a camera shake correction function. Is required.
Such a lens driving device has a structure in which a conventional AF camera module called a photographing unit (movable module) is supported by four suspension wires and is driven in two axial directions perpendicular to the optical axis to correct camera shake. It has become.
Specifically, one end of each of the four linear suspension wires is fixed to the four corners of the base, and the other end is inserted into the through hole of the upper leaf spring and fixed with solder or the like.
By the way, in such a lens driving device, if an unnecessary resonance occurs in the direction intersecting the optical axis in the photographing unit, an operation for correcting camera shake is hindered.
In patent document 1, the damper material which suppresses an unnecessary resonance is arrange | positioned between the magnet holder and the coil board | substrate.

JP 2013-44924 A

However, in the structure described in Patent Document 1 described above, the damper material is disposed between the magnet holder (autofocus lens driving unit) and the coil substrate, and in this structure, the gel-like damper material is dispenser. It is difficult to apply by, for example, and there is a problem that productivity is low.
The present invention has been made in view of such 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 easy-to-manufacture configuration. .

  In order to achieve the above-described object, a lens driving device of the present invention includes a lens holding member capable of holding a lens body, a movable unit including a first drive mechanism for moving the lens holding member in the optical axis direction, and the movable unit. A suspension wire that supports the unit so as to be movable in a direction intersecting the optical axis direction and is exposed from the movable unit, and a second drive mechanism that moves the movable unit in a direction intersecting the optical axis direction The movable unit includes an upper leaf spring and a lower leaf spring that support the lens holding member so as to be movable in the optical axis direction, and a fixing member to which the upper leaf spring and the lower leaf spring are fixed. In the lens driving device, the movable unit has an annular holding portion in which a through-hole through which the suspension wire is inserted is formed. Damper material in contact with both the middle portion of the suspension wire is characterized in that it is held in the annular holding portion.

  According to this configuration, the damper material is held by the annular holding portion in which the through-hole through which the suspension wire that is exposed from the movable unit is inserted is formed. Easy to apply. Moreover, since the said damper material is hold | maintained at the said cyclic | annular holding | maintenance part, the holding | maintenance will become 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 separately.

  Preferably, at least a part of the annular holding portion is provided in the lower leaf spring, and the fixing member has a facing portion that faces the suspension wire, and the lower leaf spring is provided in the facing portion. A holding portion for holding the damper material is provided together with at least a part of the annular holding portion formed in the above.

  According to this configuration, the damper material is held by the holding portion of the fixing member in addition to the portion (at least part) of the annular holding portion formed in the lower leaf spring. It can be held securely, and the damper function is unlikely to be impaired.

  Preferably, the holding portion is located above the annular holding portion formed with the lower leaf spring, protrudes outward from the facing portion, and has two protruding portions at least at the tip portion. The annular holding portion is provided so as to be exposed from between the two protruding portions.

  According to this configuration, the contact area between the damper material and the holding portion can be increased, and a large amount of the damper material can be held in the holding portion and the annular holding portion. In addition, since the annular holding portion is provided so as to be exposed between the two protruding portions of the holding portion, the damper material can be stably and reliably held by the holding portion and the annular holding portion. .

  Preferably, the projecting portion has a step portion in which an upper portion is formed with a distance from the facing portion shorter than a lower portion.

  According to this configuration, the contact area with the damper material can be further increased.

  Preferably, the fixing member has a frame-shaped portion, and the facing portion extends downward from the frame-shaped portion, and the facing portion has a facing surface facing the suspension wire, and And a fixing surface of the lower leaf spring fixed to the mounting surface and the annular holding portion are adjacent to each other.

According to this configuration, since the annular holding portion is provided at a position adjacent to the fixing portion of the lower leaf spring, the annular holding portion is greatly deformed even when a strong impact such as dropping is applied. The damper material can be prevented from falling off from the holding portion, the annular holding portion, or the like.
Preferably, the damper material is provided from at least the facing surface to the annular holding portion. According to this configuration, since the amount of application of the damper material can be increased, the damper function can be ensured over a long period of time.

  Preferably, the opposed surfaces include a central opposed surface located at the center, and a pair of side opposed surfaces arranged adjacent to both ends of the central opposed surface in a direction intersecting the extending direction of the opposed portion. And the pair of side facing surfaces are formed to face each other.

  According to this configuration, the facing surface of the fixing member has the central facing surface and a pair of side facing surfaces located on both sides thereof, and the pair of side facing surfaces face each other. Therefore, a part of the damper material comes into contact with the pair of side facing surfaces facing each other, and the damper material provided across the annular holding portion from the facing surfaces is more reliably held. Can be.

  Preferably, a case for housing the movable unit is provided, and the case is formed in a rectangular shape in a plan view along the optical axis direction, and the through hole has a shape in a plan view in plan view. It has a substantially square shape corresponding to the shape.

  According to this configuration, since the through hole can be formed in a substantially square shape corresponding to the range in which the movable unit can move within the case, the through hole is made small so that the damper material penetrates. It can be made difficult to fall out of the hole.

  ADVANTAGE OF THE INVENTION According to this invention, the lens drive device which can suppress the unnecessary vibration and resonance of a movable unit (lens holding member) with a simple and easy manufacture structure can be provided.

1 is an external perspective view of a lens driving device according to an embodiment of the present invention. It is the disassembled perspective view seen from the upper side of the lens drive device shown in FIG. It is the disassembled perspective view seen from the downward side of the lens drive device shown in FIG. FIG. 3 is an enlarged side view of the suspension wire shown in FIG. 2. It is a perspective view of the state which omitted the case of the lens drive device shown in FIG. FIG. 6 is an enlarged perspective view of the vicinity of a damper material of the lens driving device shown in FIG. 5. FIG. 6 is an enlarged perspective view of the lens driving device shown in FIG. 5 with a damper material omitted. FIG. 6 is an enlarged perspective view in a state where a damper member and a fixing member of the lens driving device shown in FIG. 5 are omitted. It is the perspective view seen from the downward side of the state which abbreviate | omitted the case and damper material of the lens drive device shown in FIG. FIG. 10 is a perspective view of the base member shown in FIGS. 2, 3, and 9. FIG. 4 is a perspective view of the lower leaf spring shown in FIGS. 2 and 3. FIG. 4 is a plan view of the upper leaf spring shown in FIGS. 2 and 3.

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. FIG. 3 is an exploded perspective view of the lens driving device 1 shown in FIG. 4 is an enlarged side view of the suspension wires 411, 412, 413, and 414 shown in FIG. FIG. 5 is a perspective view of the lens driving device 1 shown in FIG. 1 with the case 39 omitted. FIG. 6 is an enlarged perspective view of the vicinity of the damper material 9 of the lens driving device 1 shown in FIG. FIG. 7 is an enlarged perspective view of the lens driving device 1 shown in FIG. 5 with the damper material 9 omitted. FIG. 8 is an enlarged perspective view of the lens driving device 1 shown in FIG. 5 with the damper material 9 and the fixing member 33 omitted.
For ease of understanding, FIG. 1 shows a state in which the lens body 3 is attached to the lens holding member 23. 2 and 3 are diagrams showing the positional relationship of the members, and the shapes of some of the members (the lower leaf spring 17, the upper leaf spring 35, etc.) are simplified.

  As shown in FIGS. 1 to 8, the lens driving device 1 includes, for example, a base member 11, a second coil 13, a conductive pattern 15, a lower leaf spring 17, a first coil 21, a lens holding member 23, and four pieces. Magnet (permanent magnet) 25, fixing member 33, upper leaf spring 35, spacer (top cover) 37, case 39, four suspension wires 411, 412, 413, 414, damper material 9 and the like. The conductive pattern 15 is integrally formed on the base member 11 by plating. However, in FIGS. 2 and 3, the two are shown separately for convenience.

Here, the spacer 37, the upper leaf spring 35, the fixing member 33, the magnet 25, the lens holding member 23, the first coil 21, and the lower leaf spring 17 constitute the movable unit 5.
Further, the base member 11 on which the conductive pattern 15 is formed and the second coil 13 constitute the fixed unit 7.

Further, the lower leaf spring 17, the first coil 21, the magnet 25, the fixing member 33, and the upper leaf spring 35 connect the lens holding member 23 holding the lens body 3 (lens barrel) to the optical axis direction (Z1) of the lens body 3. The first drive mechanism 55 is configured to be moved in the −Z2 direction).
Further, the second coil 13 and the magnet 25 constitute a second drive mechanism 57 that moves the movable unit 5 in a direction (X1-X2, Y1-Y2 direction) that intersects (orthogonally) the optical axis direction.

The lens driving device 1 has an autofocus function and a camera shake correction function.
The autofocus function is a function for 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 first coil 21, the magnet 25, the fixing member 33, the lower leaf spring 17, the upper leaf spring 35, and the like.

The camera shake correction function is a function that corrects camera shake generated at the time of shooting based on the position information of the movable unit 5 (lens holding member 23) detected by the GMR elements 462 and 463 so that an image without image blur can be taken. It is. In the camera shake correction function, as will be described later, the lens holding member 23 and the like are moved in the X1-X2 and Y1-Y2 directions intersecting the optical axis direction.
The camera shake correction function is mainly configured by the second 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, and 414 arranged outside the fixing member 33 are camera shake correction directions (X 1 -X 2, Y 1 -Y 2 directions) that intersect the optical axis direction (Z 1 -Z 2 direction). The movable unit 5 is supported so that the lens holding member 23 can move. The suspension wires 411, 412, 413, and 414 are arranged around the movable unit 5 while being exposed from the movable unit 5.
As shown in FIG. 4, the intermediate portion 85 located near the middle between both ends of the suspension wires 411, 412, 413, 414 is in contact with the damper material 9. The damper material 9 is held by a holding portion 33b provided in the facing portion 33a of the fixing member 33 and an annular holding portion 17a of the lower leaf spring 17 (see FIGS. 5 to 7).

  In the lens driving device 1, the damper material 9 held by the holding portion 33 b and the annular holding portion 17 a comes into contact with the intermediate portion 85 of the suspension wires 411, 412, 413, 414, thereby causing the suspension wires 411, 412, 413, 414. Since the vibration in the direction intersecting the optical axis direction of the movable unit 5 supported by is suppressed, the resonance can be avoided and the camera shake correction can be appropriately performed. Further, since the damper material 9 is provided in a place where there are few constituent members near the intermediate portion 85 of the suspension wires 411, 412, 413, and 414 arranged around the fixing member 33, Installation is easy 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 being sandwiched by the lower leaf spring 17 and the upper leaf spring 35 from both sides in the Z1-Z2 direction. The lens body 3 is held (fixed) on the inner periphery of the cylindrical lens holding member 23 by means such as adhesive or screwing.
Further, as shown in FIG. 8, the first coil 21 is fixed (held) on the outer periphery of the lens holding member 23. The first coil 21 is formed by winding a conducting wire around the outer periphery of the lens holding member 23. When the first coil 21 is energized, the first coil 21 and the lens holding member 23 are integrated in the Z1-Z2 direction (light) by electromagnetic interaction between the current flowing through the first coil 21 and the magnetic field from the magnet 25. An electromagnetic force that moves along the axial direction is generated. Thereby, an autofocus function is realized.

  Four second coils 13 are provided point-symmetrically near the center of each side of the rectangle of the base member 11 along the X1-X2 and Y1-Y2 planes. The second coil 13 is composed of a multilayer substrate 14 in which a plurality of sheet-like base materials each having a spiral conductive pattern formed in a direction along each side of the base member 11 are laminated. The base member 11 is fixed with an adhesive. A magnetic field from the magnet 25 traverses the second coil 13. Therefore, when the second coil 13 is energized, the movable unit 5 is moved in the X1-X2 and Y1-Y2 directions as a whole by electromagnetic interaction between the current flowing through the second coil 13 and the magnetic field from the magnet 25. Electromagnetic force that moves along is generated. Thereby, a camera shake correction function is realized. The plate-like magnet 25 is magnetized so that the inner surface facing the first coil 21 and the opposite outer surface have different magnetic poles.

  FIG. 9 is a perspective view seen from the lower side in a state in which the case 39 and the damper material 9 of the lens driving device 1 shown in FIG. 1 are 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.

For example, the base member 11 is formed by molding an insulating resin material, 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).
Positioning portions used for positioning the second coil 13 (multilayer substrate 14) are provided at predetermined positions on the four sides of the base member 11. On the upper surface of the base member 11, as shown in FIG. 10, four fixing portions 11 a for fixing the multilayer substrate 14 constituting the second coil 13 with an adhesive are formed. Excess adhesive is accommodated in a recess formed in an annular shape so as to surround each fixing portion 11a.
GMR elements 462 and 463 shown in FIG. 2 and FIG. 3 are mounted on the lower surface of the multilayer substrate 14 constituting the second coil 13. The base member 11 is provided with an accommodation recess 11 b for accommodating the GMR elements 462 and 463.

  As shown in FIGS. 9 and 10, a conductive pattern 15 is formed on the base member 11 by plating. The conductive pattern 15 is formed on the upper and lower surfaces of the base member 11 and the inner peripheral surface of the opening 11k. In addition, through holes 11c are formed at the four corners of the base member 11, and connection portions 151 that are electrically connected to some of the conductive patterns 15 are formed at and around the inner peripheral surface of the through hole 11c. Yes. The connection portion 151 is a part of the conductive pattern 15 and is formed by plating similarly to the conductive pattern 15.

As shown in FIGS. 5 to 8 and 4, the through hole 11 c of the base member 11 has a lower end (one end) of suspension wires 411, 412, 413, and 414 extending in the Z1-Z2 direction that is the optical axis direction. Part) is inserted and fixed. The fixing 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 solder fillet 153 is formed on the lower surface of the connection portion 151 to fix the lower end portions (one end portions) of the suspension wires 411, 412, 413 and 414.
The conductive patterns 15 are electrically separated into a plurality of wiring patterns, some of which (12 in this embodiment) are formed on the multilayer substrate 14 constituting the second coil 13 by soldering. (Not shown) is electrically connected. As a result, current can be passed through the second coil 13 via the conductive pattern 15, and the outputs of the GMR elements 462 and 463 mounted on the multilayer substrate 14 can be obtained. The plurality of conductive patterns 15 are led to the lower surface of the base member 11 to form terminal portions 15a. Of these, current can flow from the two terminal portions 15 a to the first coil 21.

  As shown in FIGS. 4, 7, and 8, the suspension wires 411, 412, 413, and 414 are formed in an elongated and substantially cylindrical shape and linearly. The upper end portions (other end portions) of the suspension wires 411, 412, 413, and 414 are inserted into holes 35g (see FIG. 12) formed at the four corners of the upper leaf spring 35 and fixed by soldering. The suspension wires 411, 412, 413, and 414 are made of a conductive metal material having elasticity, and are made of, for example, a copper alloy. As will be described later, the suspension wires 411 and 412 are also used to supply power to the first coil 21.

Hereinafter, the suspension wires 411, 412, 413, 414, and a mechanism for suppressing vibration and resonance in a 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 a lower end portion fixed to the connection portion 151 of the conductive pattern 15 formed on the base member 11, and an upper end portion is fixed to the upper leaf spring 35. The unit 5 is supported so as to be movable in the X and Y directions.

  As shown in FIGS. 5 and 6, the intermediate portion 85 located between the upper end portion and the lower end portion of the suspension wires 411, 412, 413, 414 penetrates the damper material 9 while being in contact with the damper material 9. ing. In other words, the intermediate portion 85 of the suspension wires 411 to 414 is embedded in the damper material 9.

As shown in FIGS. 7, 8 and 11, the lower leaf spring 17 has annular holding portions 17 a formed with through holes 17 a 1 through which the suspension wires 411, 412, 413 and 414 are inserted, at four corners. The through hole 17a1 is formed in a quadrangular shape corresponding to the shape (rectangular shape) in plan view of the case 39 when viewed from the optical axis direction. The annular holding portion 17a is a portion surrounding the entire circumference of the through hole 17a1, and holds the damper material 9.
As shown in FIG. 5, a damper material 9 that contacts both the annular holding portion 17 a and the intermediate portion 85 of the suspension wires 411, 412, 413, and 414 is provided.

  As shown in FIGS. 5, 6, and 7, the annular holding portion 17 a is provided on the lower leaf spring 17. The fixing member 33 has four facing portions 33 a that face the suspension wires 411, 412, 413, and 414 arranged around the fixing member 33. The facing portion 33a is provided with a holding portion 33b that is located above the annular holding portion 17a and holds the damper material 9 together with the annular holding portion 17a. The holding part 33b is an upper holding part arranged so as to overlap the upper side of the annular holding part 17a located on the lower side.

  The holding portion 33b protrudes outward from the facing portion 33a and has two protruding portions 33b1 at least at the tip portion. The annular holding portion 17a is provided so as to be exposed from between the two protruding portions 33b1.

  As shown in FIG. 7, the protruding portion 33b1 has a step portion 33c in which the upper portion (Z1 side) is formed with a shorter distance from the facing portion 33a than the lower portion (Z2 side). In addition, the structure of the holding | maintenance part 33b is not restricted to this, You may form in the cyclic | annular form where the front-end | tips of two protrusion part 33b1 were connected.

As shown in FIGS. 2 and 3, the fixing member 33 has a substantially rectangular (more strictly, octagonal) frame-like portion 33d on which the upper leaf spring 35 is placed (placed), and has a columnar shape. A facing portion 33a is provided extending downward from a corner portion of the frame-shaped portion 33d. The fixing member 33 is made of a synthetic resin material.
As shown in FIG. 7, the facing portion 33 a is provided on the facing surface 33 a 1 (side surface) facing the suspension wires 411, 412, 413, and 414, and the lower leaf spring 17 (outer fixing portion 17 f) provided at the lower end portion of the facing portion 33 a. ) Is fixed to the mounting surface 33a2 (see FIG. 3). A boss protruding downward is provided on the mounting surface 33a2.
The damper material 9 is provided from at least the facing surface 33a1 to the annular holding portion 17a. The fixing portion (outer fixing portion 17f) of the lower leaf spring 17 fixed to the attachment surface 33a2 shown in FIG. 3 and the annular holding portion 17a are adjacent to each other.

The opposing surface 33a1 is adjacent to the flat central opposing surface 33a11 located at the center and both ends of the central opposing surface 33a11 in the direction intersecting with the extending direction (optical axis direction, Z1-Z2 direction) of the opposing portion 33a. It has a pair of side part opposing surface 33a12 arrange | positioned.
The pair of side part facing surfaces 33a12 are formed so as to face each other (face each other). That is, the side facing surface 33a12 has an angle with the central facing surface 33a11 so that the pair of side facing surfaces 33a12 face each other.

  The damper material 9 is in the form of a gel provided to have a shape as shown in FIGS. 5 and 6, and is applied by a dispenser or the like in the vicinity of the intermediate portion 85 of the suspension wires 411, 412, 413, and 414 in the manufacturing process. . The applied damper material 9 enters the through hole 17a1 of the annular holding portion 17a and is held by surface tension, and then is cured by irradiating ultraviolet rays or the like. A part of the damper material 9 is also in contact with the lower surface of the annular holding portion 17a. The damper material 9 is made of an ultraviolet curable gel resin, and for example, a silicone gel (product name: TB3168E) manufactured by ThreeBond Co., Ltd. can be used.

  As described above, by supporting the damper material 9 on the annular holding portion 17a, the damper material 9 can be arranged with high precision at the position defined at the time of design, and the vibration suppressing effect by the damper material 9 can be enhanced. Further, the damper material 9 can be stably held on the annular holding portion 17a, and even when a strong impact such as dropping is applied, the damper material 9 can be made difficult to drop off from the annular holding portion 17a and the like.

  In the present embodiment, since the damper material 9 is provided so as to surround the intermediate portion 85 of the suspension wires 411, 412, 413, 414, the movable unit 5 (the lens holding member 23) extends in a direction intersecting the optical axis direction. Even if this vibration occurs, the damper material 9 can be kept around the suspension wires 411, 412, 413, and 414, and the vibration suppressing effect can be maintained.

As shown in FIG. 12, the upper leaf spring 35 includes a first upper leaf spring 35a and a second upper leaf spring 35b made of electrically conductive conductive metal plates. The first upper leaf spring 35a and the second upper leaf spring 35b each have an outer portion 35c formed in a U-shape (a U-shape) so as to form a frame shape as a whole, and an inner side of the outer portion 35c. And an inner portion 35d 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 35c. The outer portion 35c is connected to the wire fixing portion 35f in which the hole 35g described above is formed.
The outer portion 35c constituting the outer fixing portion of the upper leaf spring 35 is sandwiched between a fixing member 33 (frame-like portion 33d) and two spacers 37, and is fixed with an adhesive. The inner portion 35d, which is an inner fixing portion, is formed 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 (crimping) the tip of the boss. The lens holding member 23 is fixed.

Also, one end of the first coil 21 shown in FIG. 3 is conductively connected to the first upper leaf spring 35 a via the electric wire 87, and the other end of the first coil 21 is connected to the second upper plate via the electric wire 89. The spring 35b is conductively connected.
With this configuration, the suspension wire 411 and one end of the first coil 21 are conductively connected, and the suspension wire 412 and the other end of the first coil 21 are conductively connected to supply power to the first coil 21. It becomes possible.

As shown in FIGS. 2 and 5, an elongated second coil 13 is disposed on each of the four sides of the base member 11. As described above, the four second coils 13 are formed along each side of the multilayer substrate 14 having a rectangular shape. Then, by adopting a structure in which the single multilayer substrate 14 is fixed on the base member 11, the positioning of the second coil 13 is facilitated, and the manufacturing process can be simplified. Note that both ends of each second coil 13 are electrically connected to the conductive pattern 15 formed on the base member 11 via solder.
The magnetic field from the magnet 25 crosses the second coil 13. Therefore, due to the electromagnetic interaction between the current flowing through the second coil 13 and the magnetic field from the magnet 25, the movable unit 5 is entirely moved along the X direction, the Y direction, or the direction between the X direction and the Y direction. Electromagnetic force to move is generated.

  In the present embodiment, the second coil 13 uses a multilayer substrate (laminated coil) configured by laminating a plurality of sheet-like base materials each having a conductive pattern formed in a spiral shape. However, you may use the coil which wound the conducting wire.

As shown in FIG. 11, the lower leaf spring 17 made of a metal plate includes an annular inner portion 17b, four outer portions 17c located on the outer side (outer peripheral side) than the inner portion 17b, an inner portion 17b, And four elastic arm portions 17d provided between the outer portion 17c and the outer portion 17c. In the outer portion 17c, the annular holding portion 17a and the outer fixing portion 17f described above are provided adjacent to each other. The outer fixing portion 17f is positioned closer to the elastic arm portion 17d than the annular holding portion 17a, and an attachment hole 17f1 is formed. In the lower leaf spring 17, the outer fixing portion 17f is fixed to the mounting surface 33a2 of the fixing member 33 shown in FIG. The fixing is performed by caulking. Caulking is performed by crushing the boss of the mounting surface 33a2 inserted through the mounting hole 17f1 from the tip side.
In the lower leaf spring 17, four inner fixing portions 17 e provided on the inner portion 17 b are fixed to the lower portion of the lens holding member 23 with an adhesive.
In the present embodiment, since the lower leaf spring 17 and the upper leaf spring 35 are fixed to the fixing member 33 which is the same member, the lens holding member 23 is not easily tilted with respect to the optical axis (Z1-Z2 direction). be able to.

As shown in FIGS. 2 and 3, the first coil 21 has a substantially rectangular shape (more precisely, an octagonal shape), and is wound around and fixed to the outer periphery of the lens holding member 23. The first coil 21 is powered by the suspension wires 411 and 412 as described above.
In addition, on the outside of the lens holding member 23, four magnets 25 facing each other with a gap in each of the four sides of the first coil 21 are located.

The fixing member 33 is formed of an insulating resin or the like, and the upper leaf spring 35 and the spacer 37 are fixed.
The fixing member 33 has a frame-shaped portion 33d formed in a polygonal shape (substantially rectangular body) and opposing portions 33a located at four corners. Note that the facing portion 33a is configured by legs that protrude downward from the frame-shaped portion 33d at the corners of the substantially rectangular frame-shaped portion 33d.
The magnet 25 is disposed in a state of being positioned between the adjacent facing portions 33a (leg portions), and is fixed to the side surface of the facing portion 33a by an adhesive. Thereby, the magnet 25 and the fixing member 33 are integrated.

  As shown in FIGS. 1 to 3, the case 39 has a rectangular shape in which the outer shape (contour) has two sides extending in the X direction and two sides extending in the Y direction in a plan view seen from the optical axis direction. It is formed in a box shape with the lower side (Z2 direction side) open. The case 39 is formed, for example, by squeezing a nonmagnetic metal plate. The case 39 has a quadrangular ceiling part 39a in which an opening 39k for exposing the lens body 3 is formed, and four flat side wall parts 39b extending downward from the outer edge part of the ceiling part 39a. In addition, between the adjacent side wall parts 39b and 39b becomes the circular arc shape produced when processing the case 39. FIG. The case 39 is placed on the base member 11 so as to accommodate 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 be moved in a direction intersecting the optical axis direction. It is restricted by contacting the inner surface of the portion 39b. As a result, the plastic deformation and breakage of the suspension wires 411, 412, 413 and 414 can be prevented.

  Further, as described above, the shape in plan view of the through hole 17a1 of the lower leaf spring 17 through which the suspension wires 411, 412, 413, and 414 are inserted is a rectangle corresponding to the shape (rectangular shape) in plan view of the case 39. It has a square shape (rectangular shape or square shape). That is, the four sides (inner edge portion of the annular holding portion 17a) constituting the through hole 17a1 are formed so as to be substantially parallel to the four side wall portions 39b of the case 39, respectively. Further, in the rectangular shape of the through-hole 17a1, the length ratio of the side extending in the X direction to the side extending in the Y direction is the ratio of the length of the side wall portion 39b extending in the X direction and the side wall portion 39b extending in the Y direction. It is set to almost the same level. The through hole 17a1 is formed to have a size such that the suspension wires 411, 412, 413, and 414 do not contact the inner edge of the annular holding portion 17a even when the movable unit 5 contacts the case 39. Yes. That is, the through-hole 17a1 is formed in a size having a slight margin so that the suspension wires 411, 412, 413, and 414 are not undesirably deformed.

Hereinafter, the operation of the lens driving device 1 will be described.
[auto focus]
In the autofocus operation, a current is supplied to the first coil 21 so that the focus is adjusted based on the captured image corresponding to the imaging result of the light incident on the image sensor via the lens body 3.
And the electromagnetic which moves the 1st coil 21 and the lens holding member 23 integrally along an optical axis direction (Z1-Z2 direction) by the electromagnetic interaction of the electric current which flows through the 1st coil 21, and the magnetic field from the magnet 25. Power is generated.

[Image stabilization]
In the camera shake correction operation, the second coil 13 is energized based on position information detected by the GMR elements 462, 463 and the like. The second coil 13 is configured to be able to supply current independently to a pair of coils extending in the X1-X2 direction and a pair of coils extending in the Y direction.
When the second coil 13 is energized, the lens holding member 23 and the movable unit 5 are entirely X1-X2, Y1- by electromagnetic interaction between the current flowing through the second coil 13 and the magnetic field from the magnet 25. An electromagnetic force that moves along the Y2 direction is generated. Then, the movable unit 5 supported by the suspension wires 411, 412, 413, and 414 moves in the camera shake correction direction (X1-X2, Y1-Y2 direction) orthogonal to the optical axis direction (Z direction).
At this time, since the intermediate portion 85 of the suspension wires 411, 412, 413 and 414 is in contact with the damper material 9 held by the annular holding portion 17 a, the lens holding member 23 and the movable unit 5 vibrate and resonate. Can be avoided. Thereby, camera shake correction can be performed appropriately.

As described above, according to the lens driving device 1, the damper material 9 that contacts both the annular holding portion 17a and the intermediate portion 85 of the suspension wires 411, 412, 413, and 414 is provided.
The damper material 9 is held by an annular holding portion 17a formed with a through hole 17a1 through which the suspension wires 411, 412, 413, and 414 are inserted. The suspension wires 411, 412, 413, and 414 are movable units. 5, it is easy to apply the damper material 9. Further, since the damper material 9 is held by the annular holding portion 17a, the holding is ensured.

  Further, according to the lens driving device 1, since the annular holding portion 17a is provided in the lower leaf 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 17 a is provided on the lower leaf spring 17, and the fixing member 33 faces the suspension wires 411, 412, 413, 414. There is a facing portion 33a, and the facing portion 33a is provided with a holding portion 33b which is located above the annular holding portion 17a and holds the damper material 9 together with the annular holding portion 17a. Therefore, as shown in FIG. 6, the damper material 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, so that more damper material 9 can be reliably held. And the damper function is less likely to be impaired. Further, since the annular holding portion 17a is provided on the lower leaf spring 17, it is easier to obtain the annular holding portion 17a than when the annular holding portion is provided on the synthetic resin member by molding. That is, since the fixing member 33 (opposing portion 33a) is made of resin, it is difficult to obtain a thin annular portion by molding. However, since the lower leaf spring 17 is made of metal, it can be easily formed in an annular shape.

  Further, in the lens driving device 1, as shown in FIG. 7, the holding portion 33b protrudes outward from the facing portion 33a, and has two protruding portions 33b1 at least at the tip portion, and the annular holding portion 17a. Is provided so as to be exposed from between the two protrusions 33b1. Therefore, the contact area between the damper material 9 and the holding portion 33b can be increased, and a large amount of the damper material 9 can be held by the holding portion 33b and the annular holding portion 17a. Further, since the annular holding portion 17a is provided so as to be exposed between the two protruding portions 33b1 of the holding portion 33b, the damper material 9 can be stably and reliably held by the holding portion 33b and the annular holding portion 17a. .

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

  Further, 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 facing portion 33a extends downward from the frame-shaped portion 33d. Is provided. Further, the facing portion 33a is provided with a facing surface 33a1 (side surface) facing the suspension wires 411, 412, 413, and 414, and a mounting surface shown in FIG. 3 to which the lower leaf spring 17 is fixed at the lower end portion of the facing portion 33a. 33a2. Further, the damper material 9 is provided from at least the facing surface 33a1 to the annular holding portion 17a. Further, the fixing portion (outer fixing portion 17f) of the lower leaf spring 17 fixed to the attachment surface 33a2 and the annular holding portion 17a are adjacent to each other.

  With this configuration, since the amount of application of the damper material 9 can be increased, the damper function can be ensured over 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, even if a strong impact such as dropping is applied, the annular holding portion 17a is greatly deformed. The damper 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 is adjacent to the center facing surface 33a11 located at the center and both ends of the center facing surface 33a11 in the direction intersecting the extending direction (optical axis direction) of the facing portion 33a. And a pair of side facing surfaces 33a12. Further, the pair of side facing surfaces 33a12 are formed so as to face each other (face each other).
According to this configuration, the opposing surface 33a1 of the fixing member 33 has the central opposing surface 33a11 and the pair of side opposing surfaces 33a12 located on both sides thereof, so that the pair of side opposing surfaces 33a12 face each other. Therefore, a part of the damper material 9 comes into contact with the pair of side part facing surfaces 33a12 facing each other, and the damper material 9 provided across the annular holding part 17a from the facing surface 33a1 is more reliably held. Can be.

In addition, the lens driving device 1 includes a case 39 that is rectangular in plan view that accommodates the movable unit 5, and the shape of the through hole 17 a 1 of the annular holding portion 17 a in plan view corresponds to the planar shape of the case 39. It has a substantially square shape.
According to this configuration, the through-hole 17a1 can be formed in a substantially square shape corresponding to the range in which the movable unit 5 can move within the case 39. Therefore, the through-hole 17a1 is made small and the damper material 9 penetrates. It can be made difficult to fall off from the hole 17a1. In addition, since the annular holding portion 17a in which the through hole 17a1 is formed can also be formed small, for example, the lens driving device 1 can be downsized as compared with a case where the through hole is circular.

The present invention is not limited to the embodiment described above.
That is, those skilled in the art may make various modifications, combinations, subcombinations, and alternatives regarding the components of the above-described embodiments within the technical scope of the present invention or an equivalent scope thereof.

  In the above-described embodiment, the case where the lower plate spring 17 is provided with the annular holding portion 17a is illustrated, but the fixing member 33 or other members may be provided with the annular holding portion. Further, the annular holding portion may be provided on both the lower leaf spring 17 and the fixing member 33.

The annular holding portion (17a) is a portion that surrounds the through hole (17a1). However, the annular holding portion (17a) does not need to completely surround the entire circumference of the through hole, as long as the applied damper material 9 can be held. A part of the annular holding portion may be interrupted. However, also in this case, it is assumed that the annular holding portion located on the side far from the optical axis is continuously formed with reference to the suspension wire.
Moreover, although the case where the holding part 33b was provided in the fixing member 33 was illustrated, you may make it the structure which hold | maintains the damper material 9 only by the cyclic | annular holding part 17a, without providing the holding part 33b.
Further, 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 constituted only by the lower leaf spring 17, but the lower leaf spring 17 and the fixing member 33 constitute an annular holding portion that holds the damper material 9. May be. That is, for example, the through hole 17a1 and the mounting hole 17f1 of the lower leaf spring 17 are connected, and a part (outer holding portion) of the lower leaf spring 17 is opposed to the outer peripheral side far from the optical axis of the suspension wire. The inner peripheral side close to the shaft may be opposed to a holding portion (inner holding portion) formed at the opposing portion of the fixing member 33, and an outer holding portion and an inner holding portion may constitute an annular holding portion. Thus, in any case, the lower leaf spring has an outer holding portion facing the suspension wire on at least a part of the annular holding portion on the outer peripheral side far from (distant from) the optical axis of the suspension wire. It is assumed that

  In the above-described embodiment, the case where the four suspension wires 411, 412, 413, and 414 are used is illustrated, but the number of suspension wires is not particularly limited.

In the above-described embodiment, the case where the intermediate portion 85 of one suspension wire 411, 412, 413, 414 is brought into contact with one damper material 9 is exemplified, but a plurality of different positions other than the intermediate portion or the intermediate portion are used. You may make it contact with the damper material 9.
Further, a plurality of annular holding portions 17a and damper materials 9 may be provided at different positions in the Z direction with respect to one suspension wire 411, 412, 413, 414.

  Moreover, the member of the damper material 9 is not limited to a gel-like thing, if it has vibration absorption.

  In the above-described embodiment, the case where the first upper leaf spring 35a and the second upper leaf spring 35b are physically separated is exemplified. However, if the first upper leaf spring 35a and the second upper leaf spring 35b are electrically separated, they are configured as one module. May be.

In the above-described embodiment, the first drive mechanism 55 (autofocus mechanism) and the second drive mechanism 57 (camera shake correction mechanism) share the magnet 25. However, different magnets are used corresponding to each. It may be configured.
In the above-described embodiment, the case where the other end portions of the suspension wires 411, 412, 413, and 414 are fixed to the upper leaf spring 35 is illustrated, but may be fixed to the fixing member 33.

  The present invention is applicable to a lens driving device using a suspension wire.

DESCRIPTION OF SYMBOLS 1 ... Lens drive device 3 ... Lens body 5 ... Movable unit 7 ... Fixed unit 9 ... Damper material 11 ... Base member 13 ... 2nd coil 14 ... Multilayer substrate 15 ... Conductive pattern 17 ... Lower leaf | plate spring 17a ... Ring-shaped holding part 17a1 ... through hole
17f ... Outer fixing part (fixing part)
DESCRIPTION OF SYMBOLS 21 ... 1st coil 23 ... Lens holding member 25 ... Magnet 33 ... Fixing member 33a ... Opposing part 33a1 ... Opposing surface
33a11 ... Center facing surface
33a12 ... Side facing surface 33a2 ... Mounting surface 33b ... Holding part 33b1 ... Projection part 33d ... Frame-like part 35 ... Upper leaf spring 37 ... Spacer 39 ... Case 411,412,413,414 ... Suspension wire 85 ... Intermediate part 55 ... First drive mechanism 57 ... Second drive mechanism 462, 463 ... GMR element

Claims (9)

A movable unit including a lens holding member capable of holding the lens body and a first drive mechanism for moving the lens holding member in the optical axis direction; and supporting the movable unit movably in a direction intersecting the optical axis direction. A suspension wire provided to be exposed from the movable unit, and a second drive mechanism for moving the movable unit in a direction intersecting the optical axis direction,
The movable unit is
In a lens driving device having an upper leaf spring and a lower leaf spring that support the lens holding member so as to be movable in the optical axis direction, and a fixing member to which the upper leaf spring and the lower leaf spring are fixed.
The movable unit has an annular holding part formed with a through hole through which the suspension wire is inserted,
A lens driving device, wherein a damper material that contacts both the annular holding portion and an intermediate portion of the suspension wire is held by the annular holding portion.   The lens driving device according to claim 1, wherein the annular holding portion is provided on at least one of the lower leaf spring and the fixing member.   At least a part of the annular holding portion is provided on the lower leaf spring, and the fixing member has a facing portion facing the suspension wire, and the facing portion is formed on the lower leaf spring. The lens driving device according to claim 1, further comprising a holding portion that holds the damper material together with at least a part of the annular holding portion.   The holding portion is located on the upper side of the annular holding portion formed on the lower leaf spring, protrudes outward from the facing portion, and has two protruding portions at least at the tip portion. The lens driving device according to claim 3, wherein the holding portion is provided so as to be exposed from between the two protruding portions.   The lens driving device according to claim 4, wherein the protruding portion has a step portion in which an upper portion is formed to have a shorter distance from the facing portion than a lower portion.   The fixing member includes a frame-shaped portion, and the facing portion is provided to extend downward from the frame-shaped portion. The facing portion includes a facing surface facing the suspension wire and a surface of the facing portion. 6. A fixing surface of the lower plate spring fixed to the mounting surface and the annular holding portion are adjacent to each other. The lens driving device according to any one of the above.   The lens driving device according to claim 6, wherein the damper material is provided from at least the facing surface to the annular holding portion.   The opposing surface has a central opposing surface located at the center and a pair of side opposing surfaces arranged adjacent to both ends of the central opposing surface in a direction intersecting the extending direction of the opposing portion. The lens driving device according to claim 7, wherein the pair of side part facing surfaces are formed to face each other.   A case accommodating the movable unit, the case being formed in a rectangular shape in a plan view along an optical axis direction, and the shape of the through hole in a plan view is the shape of the case in a plan view; The lens driving device according to claim 1, wherein the lens driving device has a substantially rectangular shape.

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