JP5513834B2 - Lens drive device - Google Patents

Lens drive device Download PDF

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Publication number
JP5513834B2
JP5513834B2 JP2009236625A JP2009236625A JP5513834B2 JP 5513834 B2 JP5513834 B2 JP 5513834B2 JP 2009236625 A JP2009236625 A JP 2009236625A JP 2009236625 A JP2009236625 A JP 2009236625A JP 5513834 B2 JP5513834 B2 JP 5513834B2
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lens
magnet
coil
optical axis
spring
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JP2011085666A (en
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朝彰 胡
富源 呉
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台湾東電化股▲ふん▼有限公司
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Description

  The present invention relates to a lens driving device suitably used for a camera module of a mobile phone, for example.

  In a lens driving device suitably used for a mobile phone camera module or the like, the lens holder is sandwiched between a pair of ring-shaped spring plates arranged in the optical axis direction so that an autofocus (AF) operation or the like can be performed. (See Patent Document 1).

  However, a drive mechanism composed of a coil and a permanent magnet as in the prior art can only perform an AF operation. In order to incorporate a driving element other than the driving mechanism for AF operation (for example, shake correction) into the driving device, it is necessary to incorporate a permanent magnet for another driving element separately from the permanent magnet for AF. However, there is a risk that the driving device becomes large.

JP 2004-280031 A

  The present invention has been made in view of such a situation, and an object thereof is to provide a lens driving device that can be reduced in size with a simple configuration.

In order to achieve the above object, a lens driving device according to the present invention includes:
A lens holder comprising a first coil disposed on the outer periphery of the lens;
A magnet holding member for fixing a magnet having a first surface facing the first coil;
A spring for connecting the lens holder and the magnet holding member, and supporting the lens holder movably in the optical axis direction with respect to the magnet;
A base member to which a second coil is fixed facing a second surface perpendicular to the first surface of the magnet;
A lens holding unit having the lens holder, the magnet, the magnet holding member, and the spring is held so as to be movable relative to the base member in a direction perpendicular to the optical axis. .

  In the combination of the magnet and the first coil, when the first coil is energized, a driving force is generated in the optical axis direction in the first coil facing the magnet, and the lens holder on which the first coil is mounted is connected to the optical axis. It moves in the direction and AF control becomes possible. In addition, in the combination of the magnet and the second coil, when the second coil is energized, the second coil facing the magnet generates a driving force in a direction perpendicular to the optical axis, and the lens holding unit having the magnet It moves in a direction perpendicular to the optical axis, and blur correction control becomes possible. As described above, the magnet in which the first surface and the second surface are configured vertically serves as both an AF control magnet and a shake correction control magnet, so that the number of parts can be reduced. Control and blur correction control can be performed. In addition, the lens drive device can be reduced in size.

  Preferably, the spring includes a first spring that supports the lens holder on the front side in the optical axis direction, and a second spring that supports the lens holder on the rear side in the optical axis direction. The second spring is preferably disposed so as to avoid a gap position where the second surface of the magnet and the second coil face each other. The spring is preferably electrically connected to the first coil.

  Since the second spring electrically connected to the first coil is disposed so as to avoid a gap position where the second surface of the magnet and the second coil face each other, the second surface of the magnet and the second coil The magnetic flux between is not disturbed. Therefore, it is possible to perform blur correction control accurately.

  The base member and the lens holding unit may be connected by a suspension wire, and the lens holding unit may be movable in a direction perpendicular to the optical axis with respect to the base member. The spring and the suspension wire may supply power to the first coil.

  Since the lens holding unit is small and light, the lens holding unit can be easily held by suspension wires provided at the four corners of the base member. In addition, the suspension wires are arranged at the four corners of the base member in the positional relationship with the second coil, so that the lens holding unit can be efficiently driven and controlled in the direction perpendicular to the optical axis.

  The lens may be an autofocus lens and may also serve as a blur correction lens.

  The lens may be an autofocus lens, and a blur correction lens may be disposed along the optical axis separately from the lens. The blur correction lens may be attached to the base member. The suspension wire may hold the base member movably with respect to the lens holding unit in a direction perpendicular to the optical axis.

FIG. 1 is an exploded perspective view of the lens driving device according to the first embodiment of the present invention. 2A is a cross-sectional view of the lens driving device shown in FIG. 2B is a plan view of the rear spring shown in FIG. 2A. FIG. 3 is a cross-sectional view of a lens driving device according to the second embodiment of the present invention. FIG. 4 is a cross-sectional view of a lens driving device according to the third embodiment of the present invention. FIG. 5 is a cross-sectional view of a lens driving device according to the fourth embodiment of the present invention. FIG. 6 is a cross-sectional view of a lens driving device according to a fifth embodiment of the present invention. FIG. 7 is a sectional view of a lens driving device according to the sixth embodiment of the present invention.

First Embodiment A lens driving device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1, 2A and 2B. As shown in FIG. 1, the lens driving device 1 includes a lens holding unit 7 and a base member 30. The lens holding unit 7 and the base member 30 can be assembled as shown in FIG.

  As shown in FIG. 2A, an image sensor unit 40 is configured by the image sensor substrate 44 and the image sensor 42. The lens 2 is arranged in the positive direction of the optical axis of the image sensor 42. In the description of the embodiment, as shown in FIG. 2A and the like, the direction from the image sensor 44 toward the lens 2 along the imaging optical axis Z1 is the Z-axis positive direction, and the direction orthogonal to the Z-axis is X The description will be made with the axial direction and the Y-axis direction. The X axis, the Y axis, and the Z axis are perpendicular to each other.

  The lens holding unit 7 shown in FIG. 1 has a lens 2, an AF coil 4, a magnet holding member 8, a front spring 10f, a rear spring 10b, and permanent magnets 22 and 24, as shown in FIG. 2A.

  As shown in FIG. 2A, permanent magnets 22 and 24 having magnetic anisotropy are fixed to the inside of the side wall 8a of the magnet holding member 8 by adhesion or the like, and a magnetic field is generated around the permanent magnets 22 and 24. Let The permanent magnets 22 and 24 have first surfaces 22a and 24a along a plane parallel to the optical axis, and have second surfaces 22b and 24b along a plane perpendicular to the optical axis. The first surface 22a and the second surface 22b of the permanent magnet 22 are perpendicular to each other, and the first surface 24a and the second surface 24b of the permanent magnet 24 are perpendicular to each other.

  An AF coil 4 is disposed around the lens 2 shown in FIG. 2A. The AF coil 4 is disposed so as to face the first surfaces 22 a and 24 a of the permanent magnets 22 and 24. The lens 2 may be composed of a plurality of lens groups, but in the present embodiment, the description will be made assuming that the lens 2 is composed of one lens in order to simplify the description.

  As shown in FIG. 2A, a lens holder 6 is constituted by the lens 2 and the AF coil 4. The front spring 10 f and the rear spring 10 b are arranged so as to connect the lens holder 6 and the magnet holding member 8. The front spring 10f and the rear spring 10b are flexible members. A wiring circuit is formed in at least one of the springs 10f and 10b, or the spring itself becomes a wiring circuit, and the AF coil 4 is energized. It is possible. By passing a current through the AF coil 4, the lens holder 6 can be moved in the optical axis direction due to the interaction between the AF coil 4 and the permanent magnets 22 and 24.

  The front spring 10 f is disposed on the Z axis positive direction side of the lens holder 6, and the rear spring 10 b is disposed on the Z axis negative direction side of the lens holder 6. Therefore, the front spring 10f and the rear spring 10b are arranged with the lens holder 6 interposed therebetween in the optical axis direction. Thereby, the lens holding unit 7 can support the lens holder 6 having the lens 2 from both sides in the optical axis direction in a balanced manner, has high durability and reliability, and can perform AF control well. It has become.

  The front spring 10f and the rear spring 10b according to the present embodiment are configured using, for example, a conductive elastic material. Although it does not specifically limit as an elastic material which comprises the front spring 10f and the back spring 10b, For example, metal materials, such as beryllium copper or copper, gold | metal | money, or an alloy containing these, can be used.

  Thus, the lens holder 7 (lens 2 + AF coil 4), the magnet holding member 8, the front spring 10f and the rear spring 10b, and the permanent magnets 22 and 24 constitute the lens holding unit 7. As shown in FIG. 2A, the magnet holding member 8 is provided with a circular hole 8 c in a portion that hits the periphery of the optical axis of the lens 2, and does not prevent the light that has passed through the lens 2 from reaching the image sensor 42.

  As shown in FIG. 2A, the base member 30 has a fixed portion 32, a shake correction coil 34, and a position detection sensor 36. A blur correction coil 34 is disposed on a surface 32b in the positive direction of the optical axis of the fixed portion 32 and perpendicular to the optical axis so as to face the second surface 22b of the permanent magnet 22 described above. A yoke 39 may be embedded in the fixed portion 32 in the optical axis negative direction of the shake correction coil 34. The permanent magnet 22, the shake correction coil 34, and the yoke 39 constitute a shake correction VCM (Voice Coil Motor) portion 34 b.

  The permanent magnet 22 generates a magnetic field having a magnetic field direction substantially orthogonal to the direction of the current flowing through the vibration correction coil 34 around the vibration correction coil 34. When a current is passed through the blur correction coil 34, the blur correction coil 34 receives a force in a direction perpendicular to the optical axis from the magnetic field generated by the permanent magnet 22. Therefore, the lens holding unit 7 can be effectively driven along the Y-axis direction (the arrow direction shown in FIG. 2). The lens holding unit 7 is driven by the magnet holding member 8 shown in FIG. 2 sliding on the slide surface 32a of the fixed portion 32 in the Y-axis direction.

  By arranging the second surface 22b of the permanent magnet 22 and the shake correction coil 34 so as to be close to each other and face each other, the shake is constituted by the permanent magnet 22, the shake correction coil 34, and the yoke 39. The output of the correction VCM unit 34b can be increased, and the lens driving device 1 shown in FIG.

  A position detection sensor 36 is disposed on a surface 32 d where the fixed portion 32 faces the permanent magnet 24. The position information of the lens holding unit 7 in the Y-axis direction is output by a position detection sensor 36 to a shake correction circuit (not shown). Since the output information of the position detection sensor 36 is reflected and the driving command for the lens holding unit 7 is output from the blur correction circuit, feedback control of the lens holding unit 7 is possible. As the position detection sensor 36, for example, by using a Hall element, the lens driving device 1 shown in FIG. 1 can be miniaturized and the lens holding unit 7 can be accurately detected.

  Similar to the hole 8 c of the magnet holding member 8 described above, the fixing portion 32 is provided with a circular hole 32 c in a portion that hits the periphery of the optical axis of the lens 2, and the light that has passed through the lens 2 reaches the image sensor 42. It will not prevent you.

  As described above, the configuration in the Y-axis direction of the lens driving device 1 shown in FIG. 1 has been described in detail based on FIG. 2A, but the X-axis direction has the same configuration. Therefore, the lens holding unit 7 can be moved with respect to the fixed portion 32 along the XY plane perpendicular to the optical axis. In this way, a shake correction operation can be performed.

  The rear spring 10b is preferably arranged so as to avoid a gap position where the second surfaces 22b and 24b of the permanent magnets 22 and 24 and the blur correction coil 34 face each other. For example, the rear springs 10b are arranged from the four corners of the lens holding unit 7 shown in FIG. 1 so as to avoid positions on the optical axis positive direction of the blur correction coils 34 and 38. A plan view of the rear spring 10b is shown in FIG. 2B. As shown in FIG. 2B, the rear spring 10b includes a ring portion 10b1 joined to the lens holder 6 shown in FIG. 1, and a flexible portion 10b2 provided integrally at four positions in the circumferential direction of the ring portion 10b1. Have The tip of each flexible portion 10b2 has a curved shape so as to avoid the coils 34 and 38 (the same applies to the permanent magnets 22 and 24 shown in FIG. 1), and is fixed to the side wall 8a of the magnet holding member 8 shown in FIG. The As the flexible portion 10b2 bends, the rear spring 10b allows the lens holder 6 shown in FIG. 1 to move relative to the magnet holding member 8 in the Z direction. The front spring 10f shown in FIG. 1 has the same configuration as the rear spring 10b.

  In the lens driving device 1 according to the present embodiment, the common permanent magnets 22 and 24 are used in both the AF control and the shake correction control. That is, in the combination of the permanent magnets 22 and 24 and the AF coil 4, when the AF coil 4 is energized, a driving force is generated in the optical axis direction in the AF coil 4 facing the permanent magnet 22. The lens holder 6 to which the working coil 4 is attached moves in the optical axis direction. Therefore, AF control becomes possible. In addition, in the combination of the permanent magnets 22 and 24 and the shake correction coil 34, when the shake correction coil 34 is energized, the shake correction coil 34 facing the permanent magnets 22 and 24 has a direction perpendicular to the optical axis. The lens holding unit 7 having the permanent magnets 22 and 24 moves in a direction perpendicular to the optical axis. Therefore, blur correction control can be performed. As described above, the permanent magnet 22 in which the first surface 22a and the second surface 22b are configured vertically serves as both an AF control magnet and a shake correction control magnet, so that the number of parts can be reduced and simplified. With this configuration, it is possible to perform AF control and blur correction control. In addition, the lens driving device 1 can be reduced in size.

  Further, the second spring 10b that is electrically connected to the AF coil 4 is disposed so as to avoid a gap position where the second surface 22b of the permanent magnet 22 and the blur correction coil 34 face each other. The magnetic flux between the second surface 22b of the magnet 22 and the shake correction coil 34 is not disturbed. Therefore, it is possible to perform blur correction control accurately.

Second Embodiment The second embodiment is the same as the first embodiment shown in FIGS. 1 and 2 except for the following, and a duplicate description is omitted.

  As shown in FIG. 3, a blur correction coil 34 is disposed on a surface 32 b in the positive direction of the optical axis of the fixed portion 32 and perpendicular to the optical axis so as to face the first surface 22 b of the permanent magnet 22. Is arranged. In the present embodiment, the blur correction coil is also applied to the surface 32 d of the fixed portion 32 on the optical axis positive direction side and facing the second surface 24 b of the permanent magnet 24 in the same manner as the blur correction coil 34. 35 is arranged. A yoke (not shown) may be embedded in the fixing portion 32 so as to be in contact with the shake correction coil 35. The vibration correction coil 35 and the second surface 24b of the permanent magnet 24 face each other to form a vibration correction VCM (Voice Coil Motor) portion 35b.

  By passing an electric current through the blur correction coil 34 shown in FIG. 3, the lens holding unit 7 is effectively driven along the Y-axis direction (the arrow direction shown in FIG. 3) by the interaction with the permanent magnet 22. It is possible. In the present embodiment, the lens holding unit 7 can be effectively driven along the Y-axis direction due to the interaction with the permanent magnet 24 by passing a current also through the blur correction coil 35 shown in FIG. It is possible.

  As shown in FIG. 3, the position detection sensor 36 is preferably arranged in the gap of the blur correction coil 35. Thereby, it can contribute to size reduction of a lens drive device.

  The configuration in the Y-axis direction (two sets) of the lens driving device according to the second embodiment has been described based on FIG. 3, but the lens driving device according to the second embodiment has the same configuration in the X-axis direction (2 Group). Therefore, it is possible to move the lens holding unit 7 with respect to the fixed portion 32 along the XY plane perpendicular to the optical axis. In this way, by using two sets of blur correction coils in one direction, the lens holding unit 7 can be sufficiently driven even at a low voltage, and a power saving and effective blur correction operation can be performed.

Third Embodiment This embodiment is the same as the second embodiment shown in FIG. 2 except for the following, and a duplicate description is omitted.

  As shown in FIG. 4, in the permanent magnets 25 and 26 according to the present embodiment, the first surfaces 25 a and 26 a arranged along the plane parallel to the optical axis are magnetized in two poles, and in the optical axis direction. It is divided into N pole and S pole along. AF coils 46 and 47 are arranged so as to face the first surfaces 25a and 26a of the permanent magnets 25 and 26, respectively. In the first embodiment, the AF coil is composed of one coil wound around the optical axis. In the third embodiment, the AF coil is composed of two coils independent of each other. Each coil is arranged along the circumferential direction of the optical axis. In FIG. 4, two coils are shown, but in actuality, they are composed of four coils along the circumferential direction. The AF coil 46 and the permanent magnet 25, and the AF coil 47 and the permanent magnet 26 face each other to form AF control VCM portions 46b and 47b.

  The lens 2 and the AF coils 46 and 47 constitute a lens holder 16. A front spring 10f and a rear spring 10b (not shown) are arranged so as to connect the lens holder 16 and the magnet holding member 8. By passing a current through the AF coils 46 and 47, the lens holder 6 can be moved in the optical axis direction by the interaction between the AF coils 46 and 47 and the permanent magnets 25 and 26. With such a configuration, it is possible to effectively perform AF control.

  The first surface 25a and the second surface 25b of the permanent magnet 25 are in a vertical relationship, and the first surface 26a and the second surface 26b of the permanent magnet 26 are in a vertical relationship. By passing a current through the AF coils 46 and 47, the permanent magnet 25 and the AF coil 46 interact with each other, and the permanent magnet 26 and the AF coil 47 interact with each other. As a result, AF control becomes possible by moving the lens holder 16 in the optical axis direction. In addition, due to the interaction between the permanent magnet 26 and the shake correction coil 34 and between the permanent magnet 25 and the shake correction coil 35, the lens holding unit 7 moves in the direction perpendicular to the optical axis, and shake correction control becomes possible. . Accordingly, blur correction control can be performed by moving the lens holding unit 7 in the Y-axis direction in the same manner as in the first and second embodiments described above. The X-axis direction has the same configuration as that of the Y-axis direction, and blur correction can be performed by moving the lens holding unit 7 along the XY plane perpendicular to the optical axis.

  With such a configuration, AF control and blur correction control can be performed more effectively. In addition, the thickness of the AF coils 46 and 47 in the direction perpendicular to the optical axis can be reduced, which contributes to the downsizing of the lens driving device.

Fourth Embodiment This embodiment is the same as the first embodiment shown in FIGS. 1, 2A, and 2B except for the following, and a duplicate description is omitted.

  As shown in FIG. 5, an image sensor 42 is disposed on the bottom surface 8 d of the magnet holding member 8. A blur correction lens 20 and an AF lens 21 are arranged from the image sensor 42 toward the positive direction of the optical axis. In the present embodiment, an AF lens 21 that performs an autofocus operation by moving in the optical axis direction and a blur correction lens 20 that performs a blur correction operation by moving in a direction perpendicular to the optical axis are separate. It is configured. The configuration for moving the AF lens 21 in the optical axis direction is the same as that of the first embodiment except that the lens 2 shown in FIG. 2 is replaced with the AF lens 21 shown in FIG. .

  The blur correction lens 20 is fixed to the fixing portion 32. Furthermore, a blur correction coil 34 is disposed on the fixed portion 32 so as to face the second surface 22 b of the permanent magnet 22. The second surface 22b of the permanent magnet 22 and the blur correction coil 34 constitute a blur correction VCM unit that moves the blur correction lens 20 in a direction perpendicular to the optical axis Z1. By passing an electric current through the blur correction coil 34, the fixed portion 32 can be slid along the Y-axis direction with respect to the magnet holding member 8 by interaction with the permanent magnet 22. The X-axis direction has the same configuration as that of the Y-axis direction, and blur correction can be performed by moving the fixed portion 32 along the XY plane perpendicular to the optical axis.

  Thus, even if the AF lens 21 and the shake correction lens 20 are configured separately, the magnet corresponding to the AF coil and the shake correction coil is shared by the single permanent magnet 22. Therefore, it can contribute to size reduction of a lens drive device.

Fifth Embodiment The fifth embodiment is the same as the first and second embodiments shown in FIGS. 1 to 3 except for the following, and a duplicate description is omitted.

  As shown in FIG. 6, the lens 2 and the second lens 23 are arranged in this order in the positive direction of the optical axis of the image sensor 42 fixed to the image sensor substrate 44. The configuration for performing the AF control of the lens 2 and the configuration for performing the blur correction control by moving the lens holding unit 7 are the same as those in the first and second embodiments described above, and a description thereof will be omitted.

  In the present embodiment, the second case 50 is assembled to the image sensor substrate 44 so as to cover the lens driving device 1 shown in FIG. The second case 50 fixes the second lens 23. The second lens 23 can be composed of various types of lenses such as a lens for protecting the lens 2 and a water-repellent coating lens.

Sixth Embodiment The sixth embodiment is the same as the first and second embodiments shown in FIGS. 1 to 3 except for the following, and a duplicate description is omitted.

  As shown in FIG. 7, the lens holding unit 7 includes a lens holder 6 (lens 2 + AF coil 4), a magnet holding member 8, a front spring (not shown), a rear spring (not shown), and permanent magnets 22 and 24. Has been. The fixed portion 32 has a shake correction coil 34 fixed so as to face the second surface 22b of the permanent magnet 22, and a shake correction coil 35 fixed to face the second surface 24b of the permanent magnet 24. Yes. A position detection sensor 36 is fixed to the gap of the blur correction coil 35 so that the position of the lens holding unit 7 in the Y-axis direction can be detected.

  In the present embodiment, the suspension wires 60 are arranged so as to connect the four corners of the fixed portion 8 and the four corners of the lens holding unit 7 so that the lens holding unit 7 can be moved relative to the fixed portion 8. keeping. The suspension wire 60 can be energized and is electrically connected to a front spring and / or a rear spring (not shown). The configuration of the front spring and the rear spring in the present embodiment is the same as the configuration of the front spring 10f and the rear spring 10b in the first embodiment.

  The material of the suspension wire 60 is not particularly limited, but phosphor bronze is preferable.

  By passing an electric current through the blur correction coils 34 and 35, the lens holding unit 7 is driven along the Y-axis direction (arrow direction in FIG. 7) with respect to the fixed portion 8 by interaction with the permanent magnets 22 and 24. Let

  As described above, the configuration of the lens driving device in the Y-axis direction has been described in detail with reference to FIG. 7, but the X-axis direction has the same configuration. Therefore, the lens holding unit 7 can be moved with respect to the fixed portion 32 along the XY plane perpendicular to the optical axis. In this way, a shake correction operation can be performed.

  Since the lens holding unit 7 is small and light, the lens holding unit 7 can be easily held by the suspension wires 60 provided at the four corners of the fixed portion 32. In addition, the suspension wire 60 is disposed at the four corners of the fixed portion 32 in the positional relationship with the blur correction coils 34 and 35, so that the lens holding unit 7 can be efficiently controlled in the direction perpendicular to the optical axis. It becomes possible to do.

  In the fourth embodiment shown in FIG. 5, two sets of blur correction coils may be arranged along the X-axis direction and the Y-axis direction, respectively.

  In the fourth embodiment shown in FIG. 5, the bottom surface 8d of the magnet holding member 8 and the fixed portion 32 are connected by a suspension wire so that the fixed portion 32 can be moved along the XY plane perpendicular to the optical axis. You may support.

DESCRIPTION OF SYMBOLS 1 ... Lens drive device 2 ... Lens 4 ... AF coil 6 ... Lens holder 8 ... Magnet holding member 10f ... Front spring 10b ... Back spring 20 ... Blur correction lens 21 ... AF lens 22, 24 Magnet 22a ... 1st surface 22b ... second surface 30 ... base member 32 ... fixed portion 34 ... blur correction coil 60 ... suspension wire

Claims (10)

  1. A lens holder comprising a first coil disposed on the outer periphery of the lens;
    A magnet holding member for fixing a magnet having a first surface facing the first coil;
    A spring for connecting the lens holder and the magnet holding member, and supporting the lens holder movably in the optical axis direction with respect to the magnet;
    A base member to which a second coil is fixed facing a second surface perpendicular to the first surface of the magnet;
    The first slide surface provided on the base member and the second slide surface provided on the magnet holding member slide,
    And the lens holder, the lens and the magnet, and the magnet holding member, the lens holding unit having said spring, characterized that you have become relatively movable in a direction perpendicular to the optical axis with respect to the base member Drive device.
  2. A lens holder comprising a first coil disposed on the outer periphery of the lens;
     A magnet holding member for fixing a magnet having a first surface facing the first coil;
     A spring for connecting the lens holder and the magnet holding member, and supporting the lens holder movably in the optical axis direction with respect to the magnet;
     A base member to which a second coil is fixed facing a second surface perpendicular to the first surface of the magnet;
    The base member and the magnet holding member are connected by a suspension wire provided on the base member,
    A lens holding unit having the lens holder, the magnet, the magnet holding member, and the spring is movable relative to the base member in a direction perpendicular to the optical axis. Drive device.
  3. The lens driving device according to claim 2 , wherein power is supplied to the first coil by the spring and the suspension wire.
  4. The said spring is comprised by the 1st spring which supports the said lens holder in the optical axis direction front side, and the 2nd spring which supports the said lens holder in the optical axis direction back side. The lens drive device in any one of 1-3.
  5. The lens driving device according to claim 1, wherein the second spring is disposed so as to avoid a gap position where the second surface of the magnet and the second coil face each other .
  6. The spring is lens driving device according to any one of claims 1 to 5, characterized in that it is connected to the first coil and electrically.
  7.   The lens driving device according to claim 1, wherein the lens is an autofocus lens and serves also as a blur correction lens.
  8.   The lens driving apparatus according to claim 1, wherein the lens is an autofocus lens, and a blur correction lens is disposed along the optical axis separately from the lens.
  9.   The lens driving device according to claim 8, wherein the blur correction lens is attached to the base member.
  10. The lens driving device according to claim 9, wherein the suspension wire holds the base member movably with respect to the lens holding unit in a direction orthogonal to the optical axis.
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