WO2009142149A1 - Lens driving device - Google Patents

Lens driving device Download PDF

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Publication number
WO2009142149A1
WO2009142149A1 PCT/JP2009/059039 JP2009059039W WO2009142149A1 WO 2009142149 A1 WO2009142149 A1 WO 2009142149A1 JP 2009059039 W JP2009059039 W JP 2009059039W WO 2009142149 A1 WO2009142149 A1 WO 2009142149A1
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WO
WIPO (PCT)
Prior art keywords
lens
driving device
elastic member
lens driving
lens body
Prior art date
Application number
PCT/JP2009/059039
Other languages
French (fr)
Japanese (ja)
Inventor
智彦 大坂
清隆 山口
教幸 小林
Original Assignee
ミツミ電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ミツミ電機株式会社 filed Critical ミツミ電機株式会社
Priority to CN2009801182343A priority Critical patent/CN102037387A/en
Publication of WO2009142149A1 publication Critical patent/WO2009142149A1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment

Definitions

  • the present invention relates to a lens driving device, and more particularly, to an autofocus lens driving device used for a portable small camera.
  • the camera mobile phone is equipped with a portable small camera.
  • This portable small camera uses an autofocus lens driving device.
  • various autofocus lens driving devices have been proposed.
  • Patent Document 1 Japanese Patent Laid-Open No. 2007-2718708 can shorten the convergence time of the vibration of the lens support when the lens support stops moving, and can prevent the spring from being damaged by an external impact.
  • a lens driving device is disclosed.
  • the lens driving device disclosed in Patent Document 1 includes an annular lens support body that holds a lens, a coil body, a magnet, a yoke, and a spring in a housing.
  • the housing includes a frame provided on the light receiving side of the lens, a holder provided on the image forming side of the lens, and a base provided between the frame and the holder.
  • the holder is attached to a substrate on which the light receiving element is fixed.
  • the yoke is annularly provided on the inner periphery of the base and has a U-shaped cross section.
  • the magnet is disposed in the U-shape of the yoke.
  • the spring is provided between the housing and the lens support, and supports the lens support so as to be movable in the optical axis direction.
  • the lens driving device having such a configuration drives the lens support in the optical axis direction of the lens by the electromagnetic force generated by feeding the coil body, and the lens is positioned at a predetermined position by balancing the electromagnetic force and the biasing force of the spring. Hold the support.
  • the frame and the holder each have an opening at a position facing the lens.
  • the yoke is tightly fixed to the frame, and the opening of the frame is closed with a transparent light-receiving side closing member, and the frame, the light-receiving side closing member, the yoke, and the lens support
  • a sealed light receiving side damper space is formed in a space surrounded by the body and the lens.
  • the yoke is tightly fixed to the base, the opening of the holder is closed with a transparent imaging side closing member, the holder, the imaging side closing member, the base, A sealed imaging-side damper space is formed in a space surrounded by the yoke, the lens support, and the lens.
  • the lens support moves instantaneously to the light receiving side or the imaging side.
  • the air pressure in the imaging side damper space increases or decreases to suppress the movement of the lens support. Acts as follows.
  • the lens support body instantaneously moves to the light receiving side or the imaging side when power is supplied to the coil of the coil body”.
  • the lens (lens support) is at the image forming side or the light receiving side.
  • the position on the imaging side is called the infinity position
  • the position on the light receiving side is called the macro position. That is, in the lens driving device disclosed in Patent Document 1, the lens (lens support) is placed at the infinity position or the macro position when the coil body is not energized.
  • the lens (lens support) is placed at the infinity position or the macro position when the coil body is not energized. ing. As a result, there is a problem that the stroke amount necessary for lens focus adjustment is increased.
  • the lens driving device disclosed in Patent Document 1 in addition to the lens (lens body), a lens support for supporting (holding) the lens (lens body) is also necessary. Therefore, it is difficult to reduce the size of the lens driving device.
  • the lens driving device disclosed in Patent Document 1 has a problem in that the weight of the lens moving unit is increased because the lens movable unit includes a lens (lens body), a lens support, and a driving coil.
  • the main object of the present invention is to provide a lens driving device that can compensate for the reduction in lens driving force accompanying the downsizing of the camera module.
  • Another object of the present invention is to provide a lens driving device capable of suppressing a stroke amount necessary for lens focus adjustment.
  • Still another object of the present invention is to provide a lens driving device capable of suppressing the weight of the lens movable portion while accommodating a limited space.
  • a lens driving device includes a cylindrical lens body including a lens, a driving coil fixed so as to be positioned around the lens body, and the driving coil.
  • a permanent magnet an outer yoke having a permanent magnet on the inner wall, an upper elastic member that is provided on both sides of the lens body in the optical axis direction and supports the lens body so as to be displaceable in the optical axis direction while being positioned in the radial direction;
  • the lens driving device can adjust the position of the lens body in the optical axis direction by applying an electric current to the driving coil, due to the interaction between the magnetic field of the permanent magnet and the magnetic field generated by the current flowing through the driving coil.
  • the lens body is placed in the lens focus adjustment region in the optical axis direction excluding the infinity position and the macro position when the drive coil is not energized.
  • the lens body when the drive coil is not energized, the lens body is placed in the lens focus adjustment region in the optical axis direction excluding the infinity position and the macro position, so the stroke amount necessary for lens focus adjustment is suppressed. As a result, it is possible to compensate for the reduction in lens driving force accompanying the downsizing of the camera module.
  • FIG. 1 is a perspective view of a lens driving device according to a first embodiment of the present invention. It is a cross-sectional perspective view of the lens drive device shown in FIG. It is a disassembled perspective view of the lens drive device shown in FIG. It is side surface sectional drawing which expands and shows only the front half of the combined state of the lens body and drive coil of the lens drive device shown in FIG. It is a schematic front sectional drawing for demonstrating the position of the Rennes body in the conventional lens drive device. It is a schematic front sectional drawing for demonstrating the position of the lens body in the lens drive device which concerns on the 1st Embodiment of this invention.
  • FIG. 1 is an external perspective view of the lens driving device 10.
  • FIG. 2 is a cross-sectional perspective view of the lens driving device 10.
  • FIG. 3 is an exploded perspective view of the lens driving device 10.
  • an orthogonal coordinate system (X, Y, Z) is used. 1 to 3, in the orthogonal coordinate system (X, Y, Z), the X-axis direction is the front-rear direction (depth direction), the Y-axis direction is the left-right direction (width direction), and Z The axial direction is the vertical direction (height direction). In the example shown in FIGS. 1 to 3, the vertical direction Z is the optical axis O direction of the lens.
  • the optical axis O direction that is, the Z-axis direction is the front-rear direction.
  • the upward direction of the Z axis is the forward direction
  • the downward direction of the Z axis is the backward direction.
  • the illustrated lens driving device 10 is provided in a camera-equipped mobile phone capable of autofocusing.
  • the lens driving device 10 is for moving a lens body 14 including a lens in the direction of the optical axis O.
  • the lens driving device 10 includes an actuator base 12 disposed on the lower side (rear side) in the Z-axis direction (optical axis O direction).
  • the lower part (rear part) of the actuator base 12 is mounted with an image pickup device (not shown) arranged on the module substrate.
  • This imaging device captures a subject image formed by the lens of the lens body 14 and converts it into an electrical signal.
  • the image pickup device is configured by, for example, a charge coupled device (CCD) image sensor, a complementary metal oxide (CMOS) image sensor, or the like. Therefore, a camera module is configured by a combination of the lens driving device 10, the module substrate, and the image sensor.
  • the lens driving device 10 includes a lens body 14 having a cylindrical portion 140, a drive coil 16 fixed to the lens body 14 so as to be positioned around the cylindrical portion 140, and a permanent magnet facing the drive coil 16. 18, an outer yoke 20 having a permanent magnet 18 on the inner wall surface, and a pair of elastic members 22 and 24 provided on both sides of the cylindrical portion 140 of the lens body 14 in the optical axis O direction.
  • the pair of elastic members 22 and 24 support the lens body 14 so as to be displaceable in the optical axis O direction with the lens body 14 positioned in the radial direction.
  • one elastic member 22 is called an upper elastic member
  • the other elastic member 24 is called a lower elastic member.
  • the illustrated elastic member is constituted by a leaf spring. Therefore, the upper elastic member 22 is also called an upper leaf spring, and the lower elastic member spring 24 is also called a lower leaf spring.
  • the upward direction in the Z-axis direction (optical axis O direction) is the forward direction
  • the downward direction in the Z-axis direction (optical axis O direction) is the backward direction. Therefore, the upper elastic member (upper leaf spring) 22 is also called a front spring
  • the lower elastic member (lower leaf spring) 24 is also called a rear spring.
  • the illustrated outer yoke 20 has a rectangular tube shape. Therefore, the illustrated drive coil 16 also has a substantially rectangular tube shape that matches the shape of the rectangular tube-shaped outer yoke 20. That is, the drive coil 16 includes four long side portions 161 and four corner portions 162 disposed between the four long side portions.
  • the cylindrical portion 140 of the lens body 14 has four main contact surfaces 140-1 that are chamfered at an angular interval of 90 °.
  • the four long side portions 161 of the drive coil 16 are directly coupled to these four main contact surfaces 140-1 with an adhesive (adhesive resin). That is, the drive coil 16 is bonded to the lens body 14 by the four contact surfaces 140-1.
  • the drive coil 16 has a step (projection) 163 that projects radially inward on the inner surface of the upper portion thereof.
  • the cylindrical portion 140 of the lens body 14 has four sub-contact surfaces 140-2 that are further chamfered at the upper part of the four main contact surfaces 140-1.
  • the step (projection) 163 of the drive coil 16 is directly coupled to these four sub-contact surfaces 140-2 with an adhesive (adhesive resin).
  • the lens body 14 and the drive coil 16 constitute a lens movable part.
  • the lens body 14 is directly held by the drive coil 16 without using the lens holder that holds the lens body 14, the weight of the lens movable portion can be reduced. Thereby, it is possible to compensate for a reduction in the thrust of the lens movable portion accompanying the downsizing of the camera module. Further, the lens body 14 can be positioned by providing the drive coil 16 that supports the lens body 14 with the step 163. Further, the coupling strength between the lens body 14 and the drive coil 16 can be improved.
  • the step 163 is provided in the drive coil 16 in order to hold the lens body 14, but the lens body 14 may be held by screw fitting.
  • a male screw is cut on the outer peripheral wall of the cylindrical portion 140 of the lens body 14, and the shape of the female screw may be formed on the inner diameter portion of the drive coil 16 itself.
  • the permanent magnet 18 is composed of four permanent magnet pieces 182 having an L-shaped cross section disposed at each corner of the square cylinder of the yoke 20.
  • the outer yoke 20 has a rectangular tube-shaped outer tube portion 202 and a rectangular outer ring end portion 204 provided at the upper end (front end) of the outer tube portion 202.
  • the permanent magnet 18 is provided on the inner wall of the outer cylindrical portion 202.
  • the outer ring end 204 has a circular opening 204a having a center concentric with the optical axis O.
  • the outer yoke 20 has four concave portions (stepped portions) 206 recessed inward at the four corners of the upper end (front end) thereof. These four concave portions (stepped portions) 206 sandwich the outer peripheral side end 224 (described later) of the upper elastic member 22 between the upper end of the permanent magnet 18 and the outer peripheral side end 224 of the upper elastic member 22. It is for holding and fixing. That is, these four concave portions (stepped portions) 206 act as holding members that hold the outer peripheral side end portion 224 of the upper elastic member 22.
  • the permanent magnet 18 is disposed on the inner peripheral surface of the outer cylindrical portion 202 of the outer yoke 20 at a distance from the drive coil 16.
  • the upper elastic member (upper leaf spring, front spring) 22 is disposed on the upper side (front side) in the optical axis O direction of the lens body 14, and the lower elastic member (lower leaf spring, rear spring) 24 is the optical axis of the lens body 14. It arrange
  • the upper elastic member (upper leaf spring, front spring) 22 and the lower elastic member (lower leaf spring, rear spring) 24 have substantially the same configuration.
  • the upper elastic member (upper leaf spring, front spring) 22 includes an inner peripheral end 222 attached to the lens body 14, an outer peripheral end 224 attached to the outer yoke 20, and an inner peripheral end 222. It has four arm parts (not shown) provided along the circumferential direction in order to connect between the outer peripheral side end part 224.
  • the inner peripheral end 222 has an annular shape.
  • the outer peripheral end 224 is provided apart from the inner peripheral end 222 and has a larger square ring shape than the inner peripheral end 222. Each arm portion extends along the circumferential direction.
  • the lower elastic member (lower leaf spring, rear spring) 24 includes an inner peripheral end 242 attached to the lens holder 14, an outer peripheral end 244 attached to the outer yoke 20, and an inner peripheral
  • the inner peripheral side end 242 has an annular shape.
  • the outer peripheral side end 244 is provided apart from the inner peripheral side end 244 and has a quadrangular annular shape larger than the inner peripheral side end 242. Each arm portion extends along the circumferential direction.
  • the inner peripheral side end portions 222 and 242 are also called inner rings, and the outer peripheral side end portions 224 and 244 are also called outer rings.
  • the inner peripheral end 222 of the upper elastic member (upper leaf spring, front spring) 22 is sandwiched and fixed between the lens body 14 and the stopper 26.
  • the stopper 26 is fitted to the lens body 14 so as to sandwich the inner peripheral side end 222 of the upper elastic member (upper leaf spring, front spring) 22 with the lens holder 14.
  • the outer peripheral end 224 of the upper elastic member (upper leaf spring, front spring) 22 is sandwiched and fixed between the four recesses (steps) 206 of the outer yoke 20 and the upper end of the permanent magnet 18. .
  • the stopper 26 has the following functions. In other words, the stopper 26 has a function of closely contacting the inner peripheral side end 222 of the upper elastic member (upper leaf spring, front spring) 22 to the lens body 14 with high accuracy. As a result, variations in VCM (voice coil motor) characteristics can be improved.
  • the stopper 26 has a function of improving the adhesive strength of the upper elastic member (upper leaf spring, front spring) 22. Thereby, the impact resistance of the lens driving device 10 is improved. Further, the stopper 26 has a function of preventing deformation of the upper elastic member (upper leaf spring, front spring) 22 when the lens driving device 10 is dropped. This also improves the impact resistance of the lens driving device 10.
  • the outer peripheral side end 244 of the lower elastic member (lower leaf spring, rear spring) 24 is fixed to the inner yoke 30 via the spacer 28.
  • the spacer 28 and the outer peripheral end 244 of the lower elastic member (lower leaf spring, rear spring) 24 are sandwiched and fixed between the inner yoke 30 and the lower end of the permanent magnet 18.
  • An inner peripheral end 242 of the lower elastic member (lower leaf spring, rear spring) 24 is fixed to the lower end (rear end) side of the lens holder 14 with resin adhesive force.
  • the position of the lens body 14 in the direction of the optical axis O can be adjusted by the interaction between the magnetic field of the permanent magnet 18 and the magnetic field generated by the current flowing through the drive coil 16.
  • the inner yoke 30 includes a rectangular annular inner ring end 302 attached to the inner wall of the outer cylindrical portion 202 of the outer yoke 20 at the lower end, and parallel to the optical axis O inside the four corners of the inner ring end 302. And four vertically extending portions 304 extending vertically upward.
  • An inner ring end 302 of the inner yoke 30 is mounted on the actuator base 12, a spacer 28 is mounted on the inner ring end 302 of the inner yoke 30, and a lower elastic member (lower leaf spring, A rear end 244 of the rear spring 24 is mounted.
  • the four vertically extending portions 304 of the inner yoke 30 are connected to each other via a gap between the outer peripheral end 244 and the inner peripheral end 242 of the lower elastic member (lower leaf spring, rear spring) 24. , Extending vertically upwards.
  • the actuator base 12, the outer yoke 20, the permanent magnet 18, and the spacer 28 constitute a fixed portion of the lens driving device 10.
  • an annular first buffer member 32 is fixed to the inner wall of the outer ring end portion 204 of the outer yoke 20.
  • the first buffer member 32 is concentric with the circular opening 204 a of the outer ring end 204.
  • the first buffer member 32 has an outer diameter larger than the diameter of the circular opening 204a and an inner diameter smaller than the diameter of the circular opening 204a.
  • the first buffer member 32 is for reducing the impact applied to the lens body 14.
  • a spring member (elastic member) is disposed outside the yoke. Therefore, a fixing member for fixing the spring member (elastic member) is required outside the yoke.
  • the lens driving device 20 accommodates the upper elastic member 22 and the lower elastic member 24 inside the outer yoke 10, so that a fixing member (cover) that covers the outer yoke is not necessary. It becomes. Further, since no fixing member (cover) is required, the number of parts can be reduced, and the lens driving device 20 can be downsized.
  • the permanent magnet 18, outer yoke 20 and inner yoke 30 constitute a magnetic circuit.
  • the outer ring end portion 204 forms a surface on the optical axis O objective side
  • the outer tube portion 202 forms a side surface. That is, the surface and side surfaces on the optical axis O objective side are formed by the outer yoke 20 made of a ferromagnetic material that is a part of the magnetic circuit and has shielding performance.
  • a circular opening 204a formed in the outer ring end portion 204 is a hole having the smallest diameter determined from the angle of view required for the camera module.
  • an inner yoke 30 as a ferromagnetic component is provided separately from the outer yoke 20.
  • the drive coil 16 is disposed in a space between the four vertically extending portions 304 of the inner yoke 30 and the permanent magnet 18.
  • the lens body 14 when no energization of the driving coil 16, the lens body 14, a lens focus adjustment between the infinity position P ID and the macro position P MA (excluding the infinity position P ID and the macro position P MA) In the area A FA , the state is suspended by the upper elastic member 22 and the lower elastic member 24.
  • FIG. 5A shows the state (position) of the lens body 14 when the drive coil 16 is not energized
  • FIG. 5A shows the state (position) of the lens body 14 when the drive coil 16 is energized. Show.
  • FIG. 5 (A) at the time of non-energization of the driving coil 16, the lens body 14 is to be at infinity position P ID.
  • FIG. 5 (B) by energizing the driving coil 16, and shows a state of driving the lens body 14 to the macro position P MA.
  • stroke Sc are required for lens focusing.
  • FIG. 6 shows a state of the lens body 14 at the time of no electric power is supplied to the driving coil 16
  • (B) is energized to drive coil 16
  • P ID shows a state in which the driving coil 16 is energized to drive the lens body 14 to the macro position PMA .
  • the first stroke S 1 in order to move the lens body 14 from the position P UE with power off to infinity position P ID, the first stroke S 1 only required lens focus adjustment There, in order to move the lens body 14 from the position P UE with power off to the macro position P MA, it is required by the second stroke S 2 to the lens focal point adjustment.
  • the lens driving device 10 according to the present embodiment is different from the conventional lens driving device 10 ′ in that the stroke amounts S 1 and S 2 required for the lens focus adjustment are the conventionally required stroke amount Sc. Than can be suppressed. As a result, it is possible to compensate for the lens driving force reduction accompanying the downsizing of the camera module.
  • FIG. 7 is an enlarged longitudinal sectional view showing only half of the lens driving device 10A.
  • the outer yoke and the actuator base are changed as will be described later, and an annular spacer 34 and second and third buffer members 36 and 38 are further added. Except for this, it has the same configuration as the lens driving device 10 shown in FIGS. Accordingly, reference numerals 20A and 12A are assigned to the outer yoke and the actuator base, respectively. Components having the same functions as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and only different points will be described below for simplification of description.
  • the outer yoke 20 includes a concave portion (step portion) 206 in order to hold and fix the outer peripheral side end portion 224 of the upper elastic member 22. Therefore, the shape of the outer yoke 20 is complicated.
  • an outer yoke 20A having no recess (stepped portion) 206 as shown in FIG. 7 is used instead of the outer yoke 20 having a complicated shape.
  • the outer yoke 20A shown in FIG. 7 has a rectangular cylindrical outer cylinder portion 202A and a rectangular outer ring end portion 204A provided at the upper end (front end) of the outer cylindrical portion 202A.
  • the outer ring end portion 204A has a circular opening 204a having a center concentric with the optical axis O.
  • the outer yoke 20A has no recess (stepped portion) 206. Instead, an annular spacer 34 as shown in FIG. 7 is provided at the corner of the inner wall of the outer yoke 20A. Accordingly, the outer peripheral end 224 of the upper elastic member 22 is held and fixed to the annular spacer 34.
  • the spacers 34 are not limited to an annular shape, and may be provided at a plurality of locations.
  • the actuator base 12A is composed of an annular base portion 122A provided at the bottom and a cylindrical vertical extension portion 124A extending upward from the outer peripheral edge of the base portion 122A.
  • An annular second buffer member 36 is fixed to the inner wall of the base portion 122A.
  • four third buffer members 38 are fixed to the inner walls of the four vertically extending portions 304 of the inner yoke 30, respectively.
  • the lens driving device 10A includes first to third buffer members 32, 36, and 38 for reducing the impact applied to the lens body 14 outside the lens focus adjustment region. Yes. Thereby, damage to the lens body 14, the upper elastic member 22, and the lower elastic member 24 can be suppressed.
  • the lens driving device 10A includes the first to third buffer members 32, 36, and 38, but may include at least one of them.
  • the buffer members 32, 36, and 38 are provided on the fixed portion side.
  • the buffer member may be provided on the lens body 14 side. Good.
  • the lens driving devices 10 and 10A In the lens driving devices 10 and 10A according to the first and second embodiments of the present invention described above, no urging force is applied to the lens body 14 when the drive coil 16 is not energized. In other words, the lens body 14 is placed in an unloaded state when the drive coil 16 is not energized. Therefore, when vibration is applied to the lens driving devices 10 and 10A from the outside, there is a problem that the lens body 14 itself is likely to vibrate due to the vibration. In order to solve this problem, the lens driving devices according to the third and fourth embodiments of the present invention described below are configured to apply a biasing force to the lens body 14.
  • FIG. 8 is a schematic front sectional view showing a method of supporting the lens body 14 of the lens driving device 10B according to the third embodiment of the present invention.
  • the illustrated lens driving device 10B has the same configuration as the lens driving devices 10 and 10A described above except that the method for supporting the lens body 14 is different.
  • the upper elastic member 22 is attached so as to apply a downward biasing force to the lens body 14 as indicated by an arrow A1 when the drive coil 16 is not energized.
  • the side elastic member 24 is attached so as to apply an upward biasing force to the lens body 14 as indicated by an arrow A2 when the drive coil 16 is not energized.
  • the downward biasing force A1 and the upward biasing force A2 are substantially the same.
  • the upper elastic member 22 and the lower elastic member 24 apply urging forces in opposite directions to the lens body 14.
  • the upper elastic member 22 and the lower elastic member 24 apply urging forces A1 and A2 in a direction in which the lens body 14 is sandwiched.
  • the lens driving device 10B has an advantage of being strong against vibration. Further, since the urging forces A1 and A2 are applied in the direction in which the lens body 14 is sandwiched by the upper elastic member 22 and the lower elastic member 24, the coupling force between the elastic members 22 and 24 and the lens body 14 is improved. be able to.
  • FIG. 9 is a schematic front sectional view showing a method for supporting the lens body 14 of the lens driving device 10C according to the fourth embodiment of the present invention.
  • the illustrated lens driving device 10C has the same configuration as the lens driving devices 10 and 10A described above except that the method for supporting the lens body 14 is different.
  • the upper elastic member 22 is attached to the lens body 14 so as to apply an upward biasing force as indicated by an arrow B1 when the drive coil 16 is not energized.
  • the side elastic member 24 is attached to the lens body 14 so as to apply a downward urging force as indicated by an arrow B2 when the drive coil 16 is not energized.
  • the upward biasing force B1 and the downward biasing force B2 are substantially the same.
  • the upper elastic member 22 and the lower elastic member 24 apply urging forces in opposite directions to the lens body 14.
  • the upper elastic member 22 and the lower elastic member 24 apply urging forces B1 and B2 in the direction in which the lens body 14 is extended.
  • the lens driving device 10C has an advantage of being strong against vibration.
  • the elastic members 22 and 24 are coupled to the lens body 14, but the elastic members 22 and 24 are movable members around the lens body 14 (for example, driving) The coil 16 or the like).
  • the one upper elastic member 22 and the one lower elastic member 24 are provided as the elastic members, a plurality of upper elastic members and a plurality of lower elastic members may be provided.
  • each of the upper elastic member and the lower elastic member includes an inner peripheral end attached to the lens body, and an outer peripheral end attached to the outer yoke. May be included.
  • the outer yoke may have an outer cylinder part provided with a permanent magnet on the inner wall and an outer ring end part provided at the upper end of the outer cylinder part. In this case, it is preferable to provide a buffer member on the inner wall of the end portion of the outer ring for reducing the impact applied to the lens body.
  • the lens driving device may include an actuator base disposed below in the optical axis direction.
  • the inner wall of the actuator base is provided with a buffer member for reducing the impact applied to the lens body.
  • the lens driving device may further include an inner yoke for fixing the outer peripheral end portion of the lower elastic member via a spacer, and the inner yoke is an inner side attached at the lower end of the outer cylindrical portion of the outer yoke.
  • a ring end portion and a plurality of vertically extending portions extending vertically upward in parallel to the optical axis inside the inner ring end portion may be configured.
  • a buffer member for alleviating the impact applied to the lens body on the inner walls of the plurality of vertically extending portions.
  • a drive coil is disposed between the plurality of vertically extending portions of the inner yoke and the permanent magnet.
  • the plurality of vertically extending portions extend vertically upward through a gap between the outer peripheral end and the inner peripheral end of the lower elastic member.
  • the driving coil directly holds the lens body.
  • the drive coil preferably has a step on the inner surface for positioning the lens body.
  • the upper elastic member and the lower elastic member are biased in the opposite directions and substantially equal to the lens body when the drive coil is not energized. It is desirable to be attached so as to give In the lens driving device according to the present invention, it is preferable that the upper elastic member and the lower elastic member give a biasing force in a direction in which the lens body is sandwiched.

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Abstract

Provided is a lens driving device capable of compensating such a reduction in a lens propelling force, as might otherwise be caused by the size reduction of a camera module.  The lens driving device comprises a cylindrical lens unit having a lens, a drive coil fixed at a position around the lens unit, a permanent magnet facing the drive coil, an outer yoke having a permanent magnet in an inner wall, and an upper elastic member and a lower elastic member disposed on the two sides of the lens unit in the optical axis direction, for supporting the lens unit such that the lens unit can be displaced in the optical axial direction while being positioned in the radial direction.  When the drive coil is not energized, the lens unit is placed in a lens focusing range of the optical axial direction excepting an infinity position and a macro position.

Description

レンズ駆動装置Lens drive device
　本発明はレンズ駆動装置に関し、特に、携帯型小型カメラに用いられるオートフォーカス用レンズ駆動装置に関する。 The present invention relates to a lens driving device, and more particularly, to an autofocus lens driving device used for a portable small camera.
　カメラ付携帯電話には携帯型小型カメラが搭載されている。この携帯型小型カメラには、オートフォーカス用レンズ駆動装置が用いられる。従来から、種々のオートフォーカス用レンズ駆動装置が提案されている。 The camera mobile phone is equipped with a portable small camera. This portable small camera uses an autofocus lens driving device. Conventionally, various autofocus lens driving devices have been proposed.
　例えば、特許文献１（特開２００７－２７１８７８号公報）は、レンズ支持体が移動を停止したときにおけるレンズ支持体の振動の収束時間を短くでき、且つ外部からの衝撃に対するスプリングの損傷を防止できるレンズ駆動装置を開示している。この特許文献１に開示されたレンズ駆動装置は、レンズを保持する環状のレンズ支持体と、コイル体と、マグネットと、ヨークと、スプリングとを筐体内に具備する。筐体は、レンズの受光側に設けたフレームと、レンズの結像側に設けたホルダと、フレームとホルダとの間に設けたベースとから構成されている。ホルダは、受光素子を固定した基板に取り付けられている。ヨークは、ベースの内周に環状に設けられ、且つ断面コ字状をしている。マグネットは、ヨークのコ字内に配置されている。スプリングは、筐体とレンズ支持体との間に設けられて、レンズ支持体を光軸方向に移動可能に支持している。このような構成のレンズ駆動装置は、コイル体に給電して生じる電磁力により、レンズ支持体をレンズの光軸方向に駆動して、電磁力とスプリングの付勢力との釣り合いにより所定位置にレンズ支持体を保持する。フレーム及びホルダには各々レンズとの対面位置に開口が形成されている。 For example, Patent Document 1 (Japanese Patent Laid-Open No. 2007-271878) can shorten the convergence time of the vibration of the lens support when the lens support stops moving, and can prevent the spring from being damaged by an external impact. A lens driving device is disclosed. The lens driving device disclosed in Patent Document 1 includes an annular lens support body that holds a lens, a coil body, a magnet, a yoke, and a spring in a housing. The housing includes a frame provided on the light receiving side of the lens, a holder provided on the image forming side of the lens, and a base provided between the frame and the holder. The holder is attached to a substrate on which the light receiving element is fixed. The yoke is annularly provided on the inner periphery of the base and has a U-shaped cross section. The magnet is disposed in the U-shape of the yoke. The spring is provided between the housing and the lens support, and supports the lens support so as to be movable in the optical axis direction. The lens driving device having such a configuration drives the lens support in the optical axis direction of the lens by the electromagnetic force generated by feeding the coil body, and the lens is positioned at a predetermined position by balancing the electromagnetic force and the biasing force of the spring. Hold the support. The frame and the holder each have an opening at a position facing the lens.
　特許文献１の第１の形態に係るレンズ駆動装置では、フレームにヨークが密着固定されており、フレームの開口を透明な受光側閉鎖部材で塞いで、フレーム、受光側閉鎖部材、ヨーク、レンズ支持体およびレンズとで囲まれる空間に密閉した受光側ダンパ空間を形成している。コイル体のコイルに給電するとレンズ支持体が受光側又は結像側に瞬時に移動するが、レンズが瞬時に移動すると受光側ダンパ空間の空気圧が高まり又は減圧し、レンズ支持体の移動を抑えるように作用する。 In the lens driving device according to the first form of Patent Document 1, the yoke is tightly fixed to the frame, and the opening of the frame is closed with a transparent light-receiving side closing member, and the frame, the light-receiving side closing member, the yoke, and the lens support A sealed light receiving side damper space is formed in a space surrounded by the body and the lens. When power is supplied to the coil of the coil body, the lens support moves instantaneously to the light receiving side or the imaging side. However, if the lens moves instantaneously, the air pressure in the light receiving side damper space increases or decreases to suppress the movement of the lens support. Act on.
　特許文献１の第２の形態に係るレンズ駆動装置では、ベースにヨークが密着固定されてあり、ホルダの開口を透明な結像側閉鎖部材で塞いで、ホルダ、結像側閉鎖部材、ベース、ヨーク、レンズ支持体及びレンズとで囲まれる空間に密閉した結像側ダンバ空間を形成している。コイル体のコイルに給電するとレンズ支持体が受光側又は結像側に瞬時に移動するが、レンズが瞬時に移動すると結像側ダンパ空間の空気圧が高まり又は減圧し、レンズ支持体の移動を抑えるように作用する。 In the lens driving device according to the second form of Patent Document 1, the yoke is tightly fixed to the base, the opening of the holder is closed with a transparent imaging side closing member, the holder, the imaging side closing member, the base, A sealed imaging-side damper space is formed in a space surrounded by the yoke, the lens support, and the lens. When power is supplied to the coil of the coil body, the lens support moves instantaneously to the light receiving side or the imaging side. However, when the lens moves instantaneously, the air pressure in the imaging side damper space increases or decreases to suppress the movement of the lens support. Acts as follows.
特開２００７－２７１８７８号公報JP 2007-271878 A
　前述した特許文献１に開示されたレンズ駆動装置では、「コイル体のコイルに給電するとレンズ支持体が受光側又は結像側に瞬時に移動する」と記載されていることから、コイル体のコイルへの無通電時には、レンズ（レンズ支持体）は、結像側又は受光側の位置にある。ここで、この技術分野において、結像側の位置は無限遠位置と呼ばれ、受光側の位置はマクロ位置と呼ばれる。すなわち、特許文献１に開示されたレンズ駆動装置は、コイル体のコイルへの無通電時に、レンズ（レンズ支持体）は、無限遠位置又はマクロ位置に置かれている。 In the lens driving device disclosed in Patent Document 1 described above, it is described that “the lens support body instantaneously moves to the light receiving side or the imaging side when power is supplied to the coil of the coil body”. When no power is supplied to the lens, the lens (lens support) is at the image forming side or the light receiving side. Here, in this technical field, the position on the imaging side is called the infinity position, and the position on the light receiving side is called the macro position. That is, in the lens driving device disclosed in Patent Document 1, the lens (lens support) is placed at the infinity position or the macro position when the coil body is not energized.
　近年、携帯電話用カメラモジュールには、高画素化、小型化が求められている。高画素化では、出来るだけ大きいレンズが要求されるのに対して、小型化では外形が小さくなる。その為、レンズ駆動装置は内側と外側とから狭まることになる。このように空間が取れなくなると、マグネットや駆動コイルも小型化する必要がある。その為、レンズ可動部を駆動する為の推進力は必然的に下がってしまう。 In recent years, camera modules for mobile phones are required to have higher pixels and smaller sizes. Higher pixels require a lens that is as large as possible, whereas the smaller the size, the smaller the outer shape. Therefore, the lens driving device is narrowed from the inside and the outside. If space cannot be obtained in this way, it is necessary to reduce the size of the magnet and the drive coil. For this reason, the driving force for driving the lens movable portion is inevitably reduced.
　このような状況において、前述したように、特許文献１に開示されたレンズ駆動装置では、コイル体のコイルへの無通電時に、レンズ（レンズ支持体）は、無限遠位置又はマクロ位置に置かれている。その結果、レンズ焦点調整に必要なストローク量が大きくなるという問題がある。 In such a situation, as described above, in the lens driving device disclosed in Patent Document 1, the lens (lens support) is placed at the infinity position or the macro position when the coil body is not energized. ing. As a result, there is a problem that the stroke amount necessary for lens focus adjustment is increased.
　また、特許文献１に開示されたレンズ駆動装置では、レンズ（レンズ体）の他にそのレンズ（レンズ体）を支持（保持）するためのレンズ支持体も必要である。その為、レンズ駆動装置を小型化することが困難である。また、特許文献１に開示されたレンズ駆動装置では、レンズ可動部が、レンズ（レンズ体）と、レンズ支持体と、駆動コイルとから構成されるので、その重量が重くなるという問題もある。 Further, in the lens driving device disclosed in Patent Document 1, in addition to the lens (lens body), a lens support for supporting (holding) the lens (lens body) is also necessary. Therefore, it is difficult to reduce the size of the lens driving device. In addition, the lens driving device disclosed in Patent Document 1 has a problem in that the weight of the lens moving unit is increased because the lens movable unit includes a lens (lens body), a lens support, and a driving coil.
　本発明の主な目的は、カメラモジュールの小型化に伴うレンズ推進力低下を補うことができる、レンズ駆動装置を提供することにある。 The main object of the present invention is to provide a lens driving device that can compensate for the reduction in lens driving force accompanying the downsizing of the camera module.
　本発明の他の目的は、レンズ焦点調整に必要なストローク量を抑えることができる、レンズ駆動装置を提供することにある。 Another object of the present invention is to provide a lens driving device capable of suppressing a stroke amount necessary for lens focus adjustment.
　本発明の更に他の目的は、限られたスペースに対応しつつ、レンズ可動部の重量を抑えることができる、レンズ駆動装置を提供することにある。 Still another object of the present invention is to provide a lens driving device capable of suppressing the weight of the lens movable portion while accommodating a limited space.
　本発明の他の目的は、説明が進むにつれて明らかになるだろう。 Other objects of the present invention will become clear as the description proceeds.
　本発明の例示的な態様の要点について述べると、レンズ駆動装置は、レンズを含む筒状のレンズ体と、このレンズ体の周囲に位置するように固定された駆動コイルと、この駆動コイルと対向する永久磁石と、内壁に永久磁石を備えた外側ヨークと、レンズ体の光軸方向両側に設けられ、レンズ体を径方向に位置決めした状態で光軸方向に変位可能に支持する上側弾性部材および下側弾性部材とを備える。レンズ駆動装置は、駆動コイルに通電することで、永久磁石の磁界と駆動コイルに流れる電流による磁界との相互作用によって、レンズ体を光軸方向に位置調整可能である。本発明の例示的な態様によれば、駆動コイルへの無通電時に、レンズ体は、無限遠位置およびマクロ位置を除いた光軸方向のレンズ焦点調整領域に置かれている。 The gist of an exemplary aspect of the present invention will be described. A lens driving device includes a cylindrical lens body including a lens, a driving coil fixed so as to be positioned around the lens body, and the driving coil. A permanent magnet, an outer yoke having a permanent magnet on the inner wall, an upper elastic member that is provided on both sides of the lens body in the optical axis direction and supports the lens body so as to be displaceable in the optical axis direction while being positioned in the radial direction; A lower elastic member. The lens driving device can adjust the position of the lens body in the optical axis direction by applying an electric current to the driving coil, due to the interaction between the magnetic field of the permanent magnet and the magnetic field generated by the current flowing through the driving coil. According to the exemplary embodiment of the present invention, the lens body is placed in the lens focus adjustment region in the optical axis direction excluding the infinity position and the macro position when the drive coil is not energized.
　本発明では、駆動コイルへの無通電時に、レンズ体が、無限遠位置およびマクロ位置を除いた光軸方向のレンズ焦点調整領域に置かれているので、レンズ焦点調整に必要なストローク量を抑えることができ、その結果として、カメラモジュールの小型化に伴うレンズ推進力低下を補うことができる。 In the present invention, when the drive coil is not energized, the lens body is placed in the lens focus adjustment region in the optical axis direction excluding the infinity position and the macro position, so the stroke amount necessary for lens focus adjustment is suppressed. As a result, it is possible to compensate for the reduction in lens driving force accompanying the downsizing of the camera module.
本発明の第１の実施の形態によるレンズ駆動装置の斜視図である。1 is a perspective view of a lens driving device according to a first embodiment of the present invention. 図１に示したレンズ駆動装置の断面斜視図である。It is a cross-sectional perspective view of the lens drive device shown in FIG. 図１に示したレンズ駆動装置の分解斜視図である。It is a disassembled perspective view of the lens drive device shown in FIG. 図１に示したレンズ駆動装置のレンズ体と駆動コイルとの結合状態の前半分のみを、拡大して示す側面断面図である。It is side surface sectional drawing which expands and shows only the front half of the combined state of the lens body and drive coil of the lens drive device shown in FIG. 従来のレンズ駆動装置におけるレンヌ体の位置を説明するための概略正面断面図である。It is a schematic front sectional drawing for demonstrating the position of the Rennes body in the conventional lens drive device. 本発明の第１の実施の形態に係るレンズ駆動装置におけるレンズ体の位置を説明するための概略正面断面図である。It is a schematic front sectional drawing for demonstrating the position of the lens body in the lens drive device which concerns on the 1st Embodiment of this invention. 本発明の第２の実施の形態に係るレンズ駆動装置の半分のみを、拡大して示す縦断面図である。It is a longitudinal cross-sectional view which expands and shows only the half of the lens drive device which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施の形態に係るレンズ駆動装置のレンズ体の支持方法を示す概略正面断面図である。It is a schematic front sectional drawing which shows the support method of the lens body of the lens drive device which concerns on the 3rd Embodiment of this invention. 本発明の第４の実施の形態に係るレンズ駆動装置のレンズ体の支持方法を示す概略正面断面図である。It is a schematic front sectional drawing which shows the support method of the lens body of the lens drive device which concerns on the 4th Embodiment of this invention.
　以下、図面を参照して、本発明の実施の形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　図１乃至図３を参照して、本発明の第１の実施の形態によるレンズ駆動装置１０について説明する。図１はレンズ駆動装置１０の外観斜視図である。図２はレンズ駆動装置１０の断面斜視図である。図３はレンズ駆動装置１０の分解斜視図である。 With reference to FIG. 1 thru | or FIG. 3, the lens drive device 10 by the 1st Embodiment of this invention is demonstrated. FIG. 1 is an external perspective view of the lens driving device 10. FIG. 2 is a cross-sectional perspective view of the lens driving device 10. FIG. 3 is an exploded perspective view of the lens driving device 10.
　ここでは、図１乃至図３に示されるように、直交座標系（Ｘ，Ｙ，Ｚ）を使用している。図１乃至図３に図示した状態では、直交座標系（Ｘ，Ｙ，Ｚ）において、Ｘ軸方向は前後方向（奥行方向）であり、Ｙ軸方向は左右方向（幅方向）であり、Ｚ軸方向は上下方向（高さ方向）である。そして、図１乃至図３に示す例においては、上下方向Ｚがレンズの光軸Ｏ方向である。 Here, as shown in FIGS. 1 to 3, an orthogonal coordinate system (X, Y, Z) is used. 1 to 3, in the orthogonal coordinate system (X, Y, Z), the X-axis direction is the front-rear direction (depth direction), the Y-axis direction is the left-right direction (width direction), and Z The axial direction is the vertical direction (height direction). In the example shown in FIGS. 1 to 3, the vertical direction Z is the optical axis O direction of the lens.
　但し、実際の使用状況においては、光軸Ｏ方向、すなわち、Ｚ軸方向が前後方向となる。換言すれば、Ｚ軸の上方向が前方向となり、Ｚ軸の下方向が後方向となる。 However, in the actual use situation, the optical axis O direction, that is, the Z-axis direction is the front-rear direction. In other words, the upward direction of the Z axis is the forward direction, and the downward direction of the Z axis is the backward direction.
　図示のレンズ駆動装置１０は、オートフォーカス可能なカメラ付き携帯電話に備えられる。レンズ駆動装置１０は、レンズを含むレンズ体１４を光軸Ｏ方向に移動させるためのものである。レンズ駆動装置１０は、Ｚ軸方向（光軸Ｏ方向）の下側（後側）に配置されたアクチュエータ・ベース１２を有する。 The illustrated lens driving device 10 is provided in a camera-equipped mobile phone capable of autofocusing. The lens driving device 10 is for moving a lens body 14 including a lens in the direction of the optical axis O. The lens driving device 10 includes an actuator base 12 disposed on the lower side (rear side) in the Z-axis direction (optical axis O direction).
　このアクチュエータ・ベース１２の下部（後部）には、図示はしないが、モジュール基板に配置された撮像素子が搭載される。この撮像素子は、レンズ体１４のレンズにより結像された被写体像を撮像して電気信号に変換する。撮像素子は、例えば、ＣＣＤ（charge coupled device）型イメージセンサ、ＣＭＯＳ（complementary metal oxide semiconductor）型イメージセンサ等により構成される。したがって、レンズ駆動装置１０と、モジュール基板と、撮像素子との組み合わせによって、カメラモジュールが構成される。 The lower part (rear part) of the actuator base 12 is mounted with an image pickup device (not shown) arranged on the module substrate. This imaging device captures a subject image formed by the lens of the lens body 14 and converts it into an electrical signal. The image pickup device is configured by, for example, a charge coupled device (CCD) image sensor, a complementary metal oxide (CMOS) image sensor, or the like. Therefore, a camera module is configured by a combination of the lens driving device 10, the module substrate, and the image sensor.
　レンズ駆動装置１０は、筒状部１４０を有するレンズ体１４と、このレンズ体１４に筒状部１４０の周囲に位置するように固定された駆動コイル１６と、この駆動コイル１６と対向する永久磁石１８と、永久磁石１８を内壁面に備えた外側ヨーク２０と、レンズ体１４の筒状部１４０の光軸Ｏ方向両側に設けられた一対の弾性部材２２、２４とを備える。 The lens driving device 10 includes a lens body 14 having a cylindrical portion 140, a drive coil 16 fixed to the lens body 14 so as to be positioned around the cylindrical portion 140, and a permanent magnet facing the drive coil 16. 18, an outer yoke 20 having a permanent magnet 18 on the inner wall surface, and a pair of elastic members 22 and 24 provided on both sides of the cylindrical portion 140 of the lens body 14 in the optical axis O direction.
　一対の弾性部材２２、２４は、レンズ体１４を径方向に位置決めした状態で光軸Ｏ方向に変位可能に支持する。一対の弾性部材２２、２４のうち、一方の弾性部材２２は上側弾性部材と呼ばれ、他方の弾性部材２４は下側弾性部材と呼ばれる、尚、図示の弾性部材は板バネから構成される。従って、上側弾性部材２２は上側板バネとも呼ばれ、下側弾性部材バネ２４は下側板バネとも呼ばれる。 The pair of elastic members 22 and 24 support the lens body 14 so as to be displaceable in the optical axis O direction with the lens body 14 positioned in the radial direction. Of the pair of elastic members 22, 24, one elastic member 22 is called an upper elastic member, and the other elastic member 24 is called a lower elastic member. The illustrated elastic member is constituted by a leaf spring. Therefore, the upper elastic member 22 is also called an upper leaf spring, and the lower elastic member spring 24 is also called a lower leaf spring.
　また、前述したように、実際の使用状況においては、Ｚ軸方向（光軸Ｏ方向）の上方向が前方向、Ｚ軸方向（光軸Ｏ方向）の下方向が後方向となる。したがって、上側弾性部材（上側板バネ）２２は前側スプリングとも呼ばれ、下側弾性部材（下側板バネ）２４は後側スプリングとも呼ばれる。 In addition, as described above, in the actual use situation, the upward direction in the Z-axis direction (optical axis O direction) is the forward direction, and the downward direction in the Z-axis direction (optical axis O direction) is the backward direction. Therefore, the upper elastic member (upper leaf spring) 22 is also called a front spring, and the lower elastic member (lower leaf spring) 24 is also called a rear spring.
　図示の外側ヨーク２０は、四角筒状をしている。したがって、図示の駆動コイル１６も、四角筒状の外側ヨーク２０の形状に合わせた、実質的に四角筒状をしている。すなわち、駆動コイル１６は、４つの長辺部１６１と、これら４つの長辺部間に配置された４つの角部１６２とから成る。 The illustrated outer yoke 20 has a rectangular tube shape. Therefore, the illustrated drive coil 16 also has a substantially rectangular tube shape that matches the shape of the rectangular tube-shaped outer yoke 20. That is, the drive coil 16 includes four long side portions 161 and four corner portions 162 disposed between the four long side portions.
　図３に加えて図４をも参照して、レンズ体１４の筒状部１４０は、９０°の角度間隔で、面取りされた４つの主接触面１４０－１を持つ。これら４つの主接触面１４０－１に、駆動コイル１６の４つの長辺部１６１が接着剤（接着樹脂）で直接結合される。すなわち、駆動コイル１６は、４つの接触面１４０－１でレンズ体１４に接着されている。また、駆動コイル１６は、その上部の内面で半径方向内側に突出した段差（突出部）１６３を持つ。レンズ体１４の筒状部１４０は、４つの主接触面１４０－１の上部で、更に面取りされた４つの副接触面１４０－２を持つ。駆動コイル１６の段差（突出部）１６３は、これら４つの副接触面１４０－２に接着剤（接着樹脂）で直接結合される。 Referring to FIG. 4 in addition to FIG. 3, the cylindrical portion 140 of the lens body 14 has four main contact surfaces 140-1 that are chamfered at an angular interval of 90 °. The four long side portions 161 of the drive coil 16 are directly coupled to these four main contact surfaces 140-1 with an adhesive (adhesive resin). That is, the drive coil 16 is bonded to the lens body 14 by the four contact surfaces 140-1. Further, the drive coil 16 has a step (projection) 163 that projects radially inward on the inner surface of the upper portion thereof. The cylindrical portion 140 of the lens body 14 has four sub-contact surfaces 140-2 that are further chamfered at the upper part of the four main contact surfaces 140-1. The step (projection) 163 of the drive coil 16 is directly coupled to these four sub-contact surfaces 140-2 with an adhesive (adhesive resin).
　レンズ体１４と駆動コイル１６とによってレンズ可動部が構成される。 The lens body 14 and the drive coil 16 constitute a lens movable part.
　このように、レンズ体１４を保持するレンズホルダを使用せずに、直接、レンズ体１４を駆動コイル１６で保持しているので、レンズ可動部の重量を軽減できる。それにより、カメラモジュールの小型化に伴う、レンズ可動部の推力低下を補うことができる。また、レンズ体１４を支持する駆動コイル１６に段差１６３を持たせることで、レンズ体１４を位置決めすることができる。また、レンズ体１４と駆動コイル１６との結合強度を向上させることができる。 Thus, since the lens body 14 is directly held by the drive coil 16 without using the lens holder that holds the lens body 14, the weight of the lens movable portion can be reduced. Thereby, it is possible to compensate for a reduction in the thrust of the lens movable portion accompanying the downsizing of the camera module. Further, the lens body 14 can be positioned by providing the drive coil 16 that supports the lens body 14 with the step 163. Further, the coupling strength between the lens body 14 and the drive coil 16 can be improved.
　尚、図示の実施の形態に係るレンズ駆動装置１０では、レンズ体１４を保持するために駆動コイル１６に段差１６３を設けているが、レンズ体１４をネジ嵌合で保持してもよい。この場合、レンズ体１４の筒状部１４０の外周壁には雄ネジが切られ、駆動コイル１６そのものでその内径部に雌ネジの形状を形成すればよい。 In the lens driving device 10 according to the illustrated embodiment, the step 163 is provided in the drive coil 16 in order to hold the lens body 14, but the lens body 14 may be held by screw fitting. In this case, a male screw is cut on the outer peripheral wall of the cylindrical portion 140 of the lens body 14, and the shape of the female screw may be formed on the inner diameter portion of the drive coil 16 itself.
　一方、永久磁石１８は、ヨーク２０の四角筒の各角部に配置された、４個の断面Ｌ字状の永久磁石片１８２から成る。 On the other hand, the permanent magnet 18 is composed of four permanent magnet pieces 182 having an L-shaped cross section disposed at each corner of the square cylinder of the yoke 20.
　外側ヨーク２０は、四角筒形状の外筒部２０２と、この外筒部２０２の上端（前端）に設けられた四角形の外側リング端部２０４とを有する。外筒部２０２の内壁に上記永久磁石１８が備えられている。外側リング端部２０４は、光軸Ｏと同心の中心を持つ円形開口２０４ａを持つ。また、外側ヨーク２０は、その上端（前端）の四隅に、内側に凹んだ４つ凹部（段差部）２０６を有する。これら４つの凹部（段差部）２０６は、上側弾性部材２２の外周側端部２２４（後述する）を、永久磁石１８の上端との間に挟んで、上側弾性部材２２の外周側端部２２４を保持固定するためのものである。すなわち、これら４つの凹部（段差部）２０６は、上側弾性部材２２の外周側端部２２４を保持する保持部材として作用する。 The outer yoke 20 has a rectangular tube-shaped outer tube portion 202 and a rectangular outer ring end portion 204 provided at the upper end (front end) of the outer tube portion 202. The permanent magnet 18 is provided on the inner wall of the outer cylindrical portion 202. The outer ring end 204 has a circular opening 204a having a center concentric with the optical axis O. Further, the outer yoke 20 has four concave portions (stepped portions) 206 recessed inward at the four corners of the upper end (front end) thereof. These four concave portions (stepped portions) 206 sandwich the outer peripheral side end 224 (described later) of the upper elastic member 22 between the upper end of the permanent magnet 18 and the outer peripheral side end 224 of the upper elastic member 22. It is for holding and fixing. That is, these four concave portions (stepped portions) 206 act as holding members that hold the outer peripheral side end portion 224 of the upper elastic member 22.
　図２に示されるように、外側ヨーク２０の外筒部２０２の内周面に、駆動コイル１６と間隔を置いて、永久磁石１８が配置されている。 As shown in FIG. 2, the permanent magnet 18 is disposed on the inner peripheral surface of the outer cylindrical portion 202 of the outer yoke 20 at a distance from the drive coil 16.
　上側弾性部材（上側板バネ，前側スプリング）２２はレンズ体１４における光軸Ｏ方向上側（前側）に配置され、下側弾性部材（下側板バネ、後側スプリング）２４はレンズ体１４における光軸Ｏ方向下端（後側）に配置される。上側弾性部材（上側板バネ、前側スプリング）２２と下側弾性部材（下側板バネ、後側スプリング）２４とは、略同一構成をしている。 The upper elastic member (upper leaf spring, front spring) 22 is disposed on the upper side (front side) in the optical axis O direction of the lens body 14, and the lower elastic member (lower leaf spring, rear spring) 24 is the optical axis of the lens body 14. It arrange | positions at the O direction lower end (rear side). The upper elastic member (upper leaf spring, front spring) 22 and the lower elastic member (lower leaf spring, rear spring) 24 have substantially the same configuration.
　上側弾性部材（上側板バネ、前側スプリング）２２は、レンズ体１４に取り付けられた内周側端部２２２と、外側ヨーク２０に取り付けられた外周側端部２２４と、内周側端部２２２と外周側端部２２４との間を連結するために周方向に沿って設けられた４つのアーム部（図示せず）とを有する。内周側端部２２２は円環状をしている。外周側端部２２４は、内周側端部２２２から離間して設けられ、内周側端部２２２よりも大きい四角環状をしている。各アーム部は周方向に沿って延出している。 The upper elastic member (upper leaf spring, front spring) 22 includes an inner peripheral end 222 attached to the lens body 14, an outer peripheral end 224 attached to the outer yoke 20, and an inner peripheral end 222. It has four arm parts (not shown) provided along the circumferential direction in order to connect between the outer peripheral side end part 224. The inner peripheral end 222 has an annular shape. The outer peripheral end 224 is provided apart from the inner peripheral end 222 and has a larger square ring shape than the inner peripheral end 222. Each arm portion extends along the circumferential direction.
　同様に、下側弾性部材（下側板バネ、後側スプリング）２４は、レンズホルダ１４に取り付けられた内周側端部２４２と、外側ヨーク２０に取り付けられた外周側端部２４４と、内周側端部２４２と外周側端部２４４との間を連結するために周方向に沿って設けられた４つのアーム部（図示せず）とを有する。内周側端部２４２は円環状をしている。外周側端部２４４は、内周側端部２４４から離間して設けられ、内周側端部２４２よりも大きい四角環状をしている。各アーム部は周方向に沿って延出している。 Similarly, the lower elastic member (lower leaf spring, rear spring) 24 includes an inner peripheral end 242 attached to the lens holder 14, an outer peripheral end 244 attached to the outer yoke 20, and an inner peripheral In order to connect between the side end portion 242 and the outer peripheral side end portion 244, there are four arm portions (not shown) provided along the circumferential direction. The inner peripheral side end 242 has an annular shape. The outer peripheral side end 244 is provided apart from the inner peripheral side end 244 and has a quadrangular annular shape larger than the inner peripheral side end 242. Each arm portion extends along the circumferential direction.
　尚、内周側端部２２２、２４２は内輪とも呼ばれ、外周側端部２２４、２４４は外輪とも呼ばれる。 The inner peripheral side end portions 222 and 242 are also called inner rings, and the outer peripheral side end portions 224 and 244 are also called outer rings.
　上側弾性部材（上側板バネ、前側スプリング）２２の内周側端部２２２は、レンズ体１４とストッパ２６に挟持されて固定されている。換言すれば、ストッパ２６は、上側弾性部材（上側板バネ、前側スプリング）２２の内周側端部２２２を、レンズホルダ１４との間で挟持するように、レンズ体１４と嵌合する。一方、上側弾性部材（上側板バネ、前側スプリング）２２の外周側端部２２４は、外側ヨーク２０の４つの凹部（段差部）２０６と永久磁石１８の上端との間に挟持され固定されている。 The inner peripheral end 222 of the upper elastic member (upper leaf spring, front spring) 22 is sandwiched and fixed between the lens body 14 and the stopper 26. In other words, the stopper 26 is fitted to the lens body 14 so as to sandwich the inner peripheral side end 222 of the upper elastic member (upper leaf spring, front spring) 22 with the lens holder 14. On the other hand, the outer peripheral end 224 of the upper elastic member (upper leaf spring, front spring) 22 is sandwiched and fixed between the four recesses (steps) 206 of the outer yoke 20 and the upper end of the permanent magnet 18. .
　ストッパ２６には、次に述べるような機能がある。すなわち、ストッパ２６は、上側弾性部材（上側板バネ、前側スプリング）２２の内周側端部２２２をレンズ体１４にバラツキなく高精度に密着させる機能を持つ。これにより、ＶＣＭ（ボイス・コイル・モータ）特性のバラツキを改善できる。また、ストッパ２６は、上側弾性部材（上側板バネ、前側スプリング）２２の接着強度を向上させる機能をもつ。これにより、レンズ駆動装置１０の耐衝撃性を向上させている。さらに、ストッパ２６は、レンズ駆動装置１０の落下衝撃の際の上側弾性部材（上側板バネ、前側スプリング）２２の変形を防止する機能を持つ。これによっても、レンズ駆動装置１０の耐衝撃性を向上させている。 The stopper 26 has the following functions. In other words, the stopper 26 has a function of closely contacting the inner peripheral side end 222 of the upper elastic member (upper leaf spring, front spring) 22 to the lens body 14 with high accuracy. As a result, variations in VCM (voice coil motor) characteristics can be improved. The stopper 26 has a function of improving the adhesive strength of the upper elastic member (upper leaf spring, front spring) 22. Thereby, the impact resistance of the lens driving device 10 is improved. Further, the stopper 26 has a function of preventing deformation of the upper elastic member (upper leaf spring, front spring) 22 when the lens driving device 10 is dropped. This also improves the impact resistance of the lens driving device 10.
　一方、下側弾性部材（下側板バネ、後側スプリング）２４の外周側端部２４４は、スペーサ２８を介して内側ヨーク３０に固定されている。換言すれば、スペーサ２８と下側弾性部材（下側板バネ、後側スプリング）２４の外周側端部２４４とは、内側ヨーク３０と永久磁石１８の下端との間に挟持されて固定されている。下側弾性部材（下側板バネ、後側スプリング）２４の内周側端部２４２は、レンズホルダ１４の下端（後端）側に樹脂の接着力で固定されている。 On the other hand, the outer peripheral side end 244 of the lower elastic member (lower leaf spring, rear spring) 24 is fixed to the inner yoke 30 via the spacer 28. In other words, the spacer 28 and the outer peripheral end 244 of the lower elastic member (lower leaf spring, rear spring) 24 are sandwiched and fixed between the inner yoke 30 and the lower end of the permanent magnet 18. . An inner peripheral end 242 of the lower elastic member (lower leaf spring, rear spring) 24 is fixed to the lower end (rear end) side of the lens holder 14 with resin adhesive force.
　駆動コイル１６に通電することで、永久磁石１８の磁界と駆動コイル１６に流れる電流による磁界との相互作用によって、レンズ体１４を光軸Ｏ方向に位置調整することが可能である。 When the drive coil 16 is energized, the position of the lens body 14 in the direction of the optical axis O can be adjusted by the interaction between the magnetic field of the permanent magnet 18 and the magnetic field generated by the current flowing through the drive coil 16.
　尚、内側ヨーク３０は、外側ヨーク２０の外筒部２０２の内壁に下端で取り付けられた四角環状の内側リング端部３０２と、この内側リング端部３０２の四隅の内側で光軸Ｏと平行に垂直上方へ延在する４つの垂直延在部３０４とを有する。 The inner yoke 30 includes a rectangular annular inner ring end 302 attached to the inner wall of the outer cylindrical portion 202 of the outer yoke 20 at the lower end, and parallel to the optical axis O inside the four corners of the inner ring end 302. And four vertically extending portions 304 extending vertically upward.
　アクチュエータ・ベース１２上に内側ヨーク３０の内側リング端部３０２が搭載され、この内側ヨーク３０の内側リング端部３０２上にスペーサ２８が搭載され、スペーサ２８上に下側弾性部材（下側板バネ、後側スプリング）２４の外周側端部２４４が搭載されている。そして、内側ヨーク３０の４つの垂直延在部３０４は、下側弾性部材（下側板バネ、後側スプリング）２４の外周側端部２４４と内周側端部２４２との間の隙間を介して、垂直に上方へ延在している。 An inner ring end 302 of the inner yoke 30 is mounted on the actuator base 12, a spacer 28 is mounted on the inner ring end 302 of the inner yoke 30, and a lower elastic member (lower leaf spring, A rear end 244 of the rear spring 24 is mounted. The four vertically extending portions 304 of the inner yoke 30 are connected to each other via a gap between the outer peripheral end 244 and the inner peripheral end 242 of the lower elastic member (lower leaf spring, rear spring) 24. , Extending vertically upwards.
　アクチュエータ・ベース１２と外側ヨーク２０と永久磁石１８とスペーサ２８とによって、レンズ駆動装置１０の固定部が構成される。 The actuator base 12, the outer yoke 20, the permanent magnet 18, and the spacer 28 constitute a fixed portion of the lens driving device 10.
　また、図２に示されるように、外側ヨーク２０の外側リング端部２０４の内壁には、円環状の第１の緩衝部材３２が固着されている。第１の緩衝部材３２は、外側リング端部２０４の円形開口２０４ａと同心である。第１の緩衝部材３２は、この円形開口２０４ａの直径よりも大きい外径を持ち、円形開口２０４ａの直径よりも小さい内径を持つ。第１の緩衝部材３２は、レンズ体１４にかかる衝撃を緩和する為のものである。 Further, as shown in FIG. 2, an annular first buffer member 32 is fixed to the inner wall of the outer ring end portion 204 of the outer yoke 20. The first buffer member 32 is concentric with the circular opening 204 a of the outer ring end 204. The first buffer member 32 has an outer diameter larger than the diameter of the circular opening 204a and an inner diameter smaller than the diameter of the circular opening 204a. The first buffer member 32 is for reducing the impact applied to the lens body 14.
　このように、上側弾性部材２２と下側弾性部材２４とは、外側ヨーク１０の内部に収容されている。そのため、上記特許文献１に開示されているような従来のレンズ駆動装置において必要であった、弾性部材（バネ部材）をヨークの外側で固定するための固定部材が不要となる。 Thus, the upper elastic member 22 and the lower elastic member 24 are accommodated in the outer yoke 10. Therefore, a fixing member for fixing the elastic member (spring member) outside the yoke, which is necessary in the conventional lens driving device as disclosed in Patent Document 1, is not necessary.
　詳述すると、従来のレンズ駆動装置では、バネ部材（弾性部材）がヨークの外側に配置されている。そのため、バネ部材（弾性部材）を固定するための固定部材がヨークの外側に必要となる。これに対して、本実施の形態によるレンズ駆動装置２０は、上側弾性部材２２と下側弾性部材２４を外側ヨーク１０の内部に収容しているので、外側ヨークを覆う固定部材（カバー）が不要となる。また、固定部材（カバー）が不要であるので、部品点数を少なくでき、レンズ駆動装置２０の小型化を図ることができる。 More specifically, in a conventional lens driving device, a spring member (elastic member) is disposed outside the yoke. Therefore, a fixing member for fixing the spring member (elastic member) is required outside the yoke. On the other hand, the lens driving device 20 according to the present embodiment accommodates the upper elastic member 22 and the lower elastic member 24 inside the outer yoke 10, so that a fixing member (cover) that covers the outer yoke is not necessary. It becomes. Further, since no fixing member (cover) is required, the number of parts can be reduced, and the lens driving device 20 can be downsized.
　永久磁石１８と外側ヨーク２０と内側ヨーク３０によって磁気回路が構成される。そして、外側ヨーク２０において、外側リング端部２０４は光軸Ｏ対物側の面を形成し、外筒部２０２は側面を形成している。すなわち、光軸Ｏ対物側の面及び側面が、磁気回路の一部でかつシールド性能を持つ強磁性材の外側ヨーク２０によって形成されている。外側リング端部２０４に形成された円形開口２０４ａは、カメラモジュールで必要とされる画角から割り出した最小径の孔である。このように、本実施の形態に係るレンズ駆動装置１０は、その外観が外側ヨーク２０で覆われているので、防塵性に優れている。更に、本実施の形態では、外側ヨーク２０とは別に、強磁性部品としての内側ヨーク３０を備えている。内側ヨーク３０の４つの垂直延在部３０４と永久磁石１８との間の空間に、駆動コイル１６が配置されている。 The permanent magnet 18, outer yoke 20 and inner yoke 30 constitute a magnetic circuit. In the outer yoke 20, the outer ring end portion 204 forms a surface on the optical axis O objective side, and the outer tube portion 202 forms a side surface. That is, the surface and side surfaces on the optical axis O objective side are formed by the outer yoke 20 made of a ferromagnetic material that is a part of the magnetic circuit and has shielding performance. A circular opening 204a formed in the outer ring end portion 204 is a hole having the smallest diameter determined from the angle of view required for the camera module. Thus, since the external appearance of the lens driving device 10 according to the present embodiment is covered with the outer yoke 20, it is excellent in dustproofness. Further, in the present embodiment, an inner yoke 30 as a ferromagnetic component is provided separately from the outer yoke 20. The drive coil 16 is disposed in a space between the four vertically extending portions 304 of the inner yoke 30 and the permanent magnet 18.
　本発明では、駆動コイル１６への無通電時に、レンズ体１４は、無限遠位置ＰＩＤとマクロ位置ＰＭＡとの間（無限遠位置ＰＩＤとマクロ位置ＰＭＡとを除く）のレンズ焦点調整領域ＡＦＡ内で、上側弾性部材２２と下側弾性部材２４とにより吊られた状態にある。 In the present invention, when no energization of the driving coil 16, the lens body 14, a lens focus adjustment between the infinity position P ID and the macro position P MA (excluding the infinity position P ID and the macro position P MA) In the area A FA , the state is suspended by the upper elastic member 22 and the lower elastic member 24.
　図５及び図６を参照して、従来のレンズ駆動装置１０’および本実施の形態に係るレンズ駆動装置１０におけるレンズ体１４の位置について説明する。 The position of the lens body 14 in the conventional lens driving device 10 'and the lens driving device 10 according to the present embodiment will be described with reference to FIGS.
　最初に図５を参照して、従来のレンズ駆動装置１０’におけるレンズ体１４の位置について説明する。図５において、（Ａ）は駆動コイル１６への無通電時でのレンズ体１４の状態（位置）を示し、（Ａ）は駆動コイル１６に通電したときのレンズ体１４の状態（位置）を示す。 First, the position of the lens body 14 in the conventional lens driving device 10 'will be described with reference to FIG. 5A shows the state (position) of the lens body 14 when the drive coil 16 is not energized, and FIG. 5A shows the state (position) of the lens body 14 when the drive coil 16 is energized. Show.
　図示の例では、図５（Ａ）に示されるように、駆動コイル１６への無通電時では、レンズ体１４が無限遠位置ＰＩＤにあるとしている。図５（Ｂ）は、駆動コイル１６に通電することにより、レンズ体１４をマクロ位置ＰＭＡまで駆動した状態を示している。従来のレンズ駆動装置１０’では、レンズ体１４を無限遠位置ＰＩＤとマクロ位置ＰＭＡとの間で移動せるために、レンズ焦点調整にストローク量Ｓｃが必要となる。 In the illustrated example, as shown in FIG. 5 (A), at the time of non-energization of the driving coil 16, the lens body 14 is to be at infinity position P ID. FIG. 5 (B), by energizing the driving coil 16, and shows a state of driving the lens body 14 to the macro position P MA. In the conventional lens driving device 10 ', in order to move the lens body 14 between the infinity position P ID and the macro position P MA, stroke Sc are required for lens focusing.
　次に図６を参照して、本実施の形態に係るレンズ駆動装置１０におけるレンズ体１４の位置について説明する。図６において、（Ａ）は駆動コイル１６への無通電時でのレンズ体１４の状態を示し、（Ｂ）は駆動コイル１６に通電して、レンズ体１４を無限遠位置ＰＩＤまで駆動した状態を示し、（Ｃ）は駆動コイル１６に通電して、レンズ体１４をマクロ位置ＰＭＡまで駆動した状態を示す。 Next, the position of the lens body 14 in the lens driving device 10 according to the present embodiment will be described with reference to FIG. In FIG. 6, (A) shows a state of the lens body 14 at the time of no electric power is supplied to the driving coil 16, (B) is energized to drive coil 16, and drives the lens member 14 to the infinity position P ID (C) shows a state in which the driving coil 16 is energized to drive the lens body 14 to the macro position PMA .
　本実施の形態に係るレンズ駆動装置１０においては、レンズ体１４を無通電時の位置ＰＵＥから無限遠位置ＰＩＤまで移動させるために、レンズ焦点調整に第１のストローク量Ｓ１だけ必要であり、レンズ体１４を無通電時の位置ＰＵＥからマクロ位置ＰＭＡまで移動させるために、レンズ焦点調整に第２のストローク量Ｓ２だけ必要である。 In the lens driving device 10 according to the present embodiment, in order to move the lens body 14 from the position P UE with power off to infinity position P ID, the first stroke S 1 only required lens focus adjustment There, in order to move the lens body 14 from the position P UE with power off to the macro position P MA, it is required by the second stroke S 2 to the lens focal point adjustment.
　このように、本実施の形態に係るレンズ駆動装置１０は、従来のレンズ駆動装置１０’と比較して、レンズ焦点調整に必要なストローク量Ｓ１、Ｓ２を、従来において必要なストローク量Ｓｃよりも抑えることができる。これにより、カメラモジュールの小型化に伴う、レンズ推進力低下を補うことができる。 As described above, the lens driving device 10 according to the present embodiment is different from the conventional lens driving device 10 ′ in that the stroke amounts S 1 and S 2 required for the lens focus adjustment are the conventionally required stroke amount Sc. Than can be suppressed. As a result, it is possible to compensate for the lens driving force reduction accompanying the downsizing of the camera module.
　図７を参照して、本発明の第２の実施の形態に係るレンズ駆動装置１０Ａについて説明する。図７はレンズ駆動装置１０Ａの半分のみを、拡大して示す縦断面図である。 A lens driving device 10A according to a second embodiment of the present invention will be described with reference to FIG. FIG. 7 is an enlarged longitudinal sectional view showing only half of the lens driving device 10A.
　図示のレンズ駆動装置１０Ａは、外側ヨークおよびアクチュエータ・ベースが後述するように変更されていると共に、環状のスペーサ３４と第２及び第３の緩衝部材３６、３８とが更に付加されている点を除いて、図１乃至図３に示したレンズ駆動装置１０と同様の構成を有する。したがって、外側ヨークおよびアクチュエータ・ベースに、それぞれ、２０Ａおよび１２Ａの参照符号を付してある。図１乃至図３に示されたものと同様の機能を有するものには同一の参照符号を付し、以下では説明の簡略化のために、異なる点についてのみ説明する。 In the illustrated lens driving device 10A, the outer yoke and the actuator base are changed as will be described later, and an annular spacer 34 and second and third buffer members 36 and 38 are further added. Except for this, it has the same configuration as the lens driving device 10 shown in FIGS. Accordingly, reference numerals 20A and 12A are assigned to the outer yoke and the actuator base, respectively. Components having the same functions as those shown in FIGS. 1 to 3 are denoted by the same reference numerals, and only different points will be described below for simplification of description.
　図１乃至図３に示したレンズ駆動装置１０では、上側弾性部材２２の外周側端部２２４を保持固定するために、外側ヨーク２０は凹部（段差部）２０６を備えている。そのため、外側ヨーク２０の形状は複雑である。 In the lens driving device 10 shown in FIGS. 1 to 3, the outer yoke 20 includes a concave portion (step portion) 206 in order to hold and fix the outer peripheral side end portion 224 of the upper elastic member 22. Therefore, the shape of the outer yoke 20 is complicated.
　そこで、図示のレンズ駆動装置１０Ａでは、複雑な形状の外側ヨーク２０の代わりに、図７に示されるような、凹部（段差部）２０６の無い外側ヨーク２０Ａを用いている。図７に示された外側ヨーク２０Ａは、四角筒形状の外筒部２０２Ａと、この外筒部２０２Ａの上端（前端）に設けられた四角形の外側リング端部２０４Ａとを有する。外側リング端部２０４Ａは、光軸Ｏと同心の中心を持つ円形開口２０４ａを持つ。 Therefore, in the illustrated lens driving device 10A, an outer yoke 20A having no recess (stepped portion) 206 as shown in FIG. 7 is used instead of the outer yoke 20 having a complicated shape. The outer yoke 20A shown in FIG. 7 has a rectangular cylindrical outer cylinder portion 202A and a rectangular outer ring end portion 204A provided at the upper end (front end) of the outer cylindrical portion 202A. The outer ring end portion 204A has a circular opening 204a having a center concentric with the optical axis O.
　外側ヨーク２０Ａには、凹部（段差部）２０６が無い。その代わりに、外側ヨーク２０Ａの内壁の角部には、図７に示されるような、環状のスペーサ３４が設けられる。従って、この環状のスペーサ３４に、上側弾性部材２２の外周側端部２２４が保持固定される。尚、スペーサ３４は、環状には限定されず、複数個所に設けるようにしても良い。 The outer yoke 20A has no recess (stepped portion) 206. Instead, an annular spacer 34 as shown in FIG. 7 is provided at the corner of the inner wall of the outer yoke 20A. Accordingly, the outer peripheral end 224 of the upper elastic member 22 is held and fixed to the annular spacer 34. The spacers 34 are not limited to an annular shape, and may be provided at a plurality of locations.
　アクチュエータ・ベース１２Ａは、底部に設けられた環状の基底部１２２Ａと、この基底部１２２Ａの外周縁から上方へ延出する筒状の垂直延出部１２４Ａとから構成されている。基底部１２２Ａの内壁には、円環状の第２の緩衝部材３６が固着されている。また、内側ヨーク３０の４つの垂直延在部３０４の内壁には、それぞれ、４つの第３の緩衝部材３８が固着されている。 The actuator base 12A is composed of an annular base portion 122A provided at the bottom and a cylindrical vertical extension portion 124A extending upward from the outer peripheral edge of the base portion 122A. An annular second buffer member 36 is fixed to the inner wall of the base portion 122A. Further, four third buffer members 38 are fixed to the inner walls of the four vertically extending portions 304 of the inner yoke 30, respectively.
　したがって、図示の実施の形態に係るレンズ駆動装置１０Ａは、レンズ焦点調整領域の外側において、レンズ体１４にかかる衝撃を緩和する為の第１乃至第３の緩衝部材３２、３６および３８を備えている。これにより、レンズ体１４や上側弾性部材２２、下側弾性部材２４にかかるダメージを抑えることができる。 Accordingly, the lens driving device 10A according to the illustrated embodiment includes first to third buffer members 32, 36, and 38 for reducing the impact applied to the lens body 14 outside the lens focus adjustment region. Yes. Thereby, damage to the lens body 14, the upper elastic member 22, and the lower elastic member 24 can be suppressed.
　尚、レンズ駆動装置１０Ａでは、第１乃至第３の緩衝部材３２、３６および３８を備えているが、その内の少なくとも１つを備えるようにしてもよい。 The lens driving device 10A includes the first to third buffer members 32, 36, and 38, but may include at least one of them.
　また、上記第１及び第２の実施の形態に係るレンズ駆動装置１０、１０Ａでは、固定部側に緩衝部材３２、３６および３８を備えているが、レンズ体１４側に緩衝部材を設けてもよい。 In the lens driving devices 10 and 10A according to the first and second embodiments, the buffer members 32, 36, and 38 are provided on the fixed portion side. However, the buffer member may be provided on the lens body 14 side. Good.
　上述した本発明の第１及び第２の実施の形態に係るレンズ駆動装置１０、１０Ａにおいては、駆動コイル１６への無通電時に、レンズ体１４に付勢力が与えられていない。換言すれば、駆動コイル１６への無通電時に、レンズ体１４は無負荷の状態に置かれている。その為、レンズ駆動装置１０、１０Ａに外部から振動が加わった際、その振動によりレンズ体１４自体も振動し易くなるという問題がある。この問題を解決するために、以下に説明する本発明の第３および第４の実施の形態に係るレンズ駆動装置では、レンズ体１４に付勢力を付与するように構成している。 In the lens driving devices 10 and 10A according to the first and second embodiments of the present invention described above, no urging force is applied to the lens body 14 when the drive coil 16 is not energized. In other words, the lens body 14 is placed in an unloaded state when the drive coil 16 is not energized. Therefore, when vibration is applied to the lens driving devices 10 and 10A from the outside, there is a problem that the lens body 14 itself is likely to vibrate due to the vibration. In order to solve this problem, the lens driving devices according to the third and fourth embodiments of the present invention described below are configured to apply a biasing force to the lens body 14.
　図８は本発明の第３の実施の形態に係るレンズ駆動装置１０Ｂのレンズ体１４の支持方法を示す概略正面断面図である。図示のレンズ駆動装置１０Ｂは、レンズ体１４の支持方法が相違する点を除いて、前述したレンズ駆動装置１０、１０Ａと同様の構成を有する。 FIG. 8 is a schematic front sectional view showing a method of supporting the lens body 14 of the lens driving device 10B according to the third embodiment of the present invention. The illustrated lens driving device 10B has the same configuration as the lens driving devices 10 and 10A described above except that the method for supporting the lens body 14 is different.
　図示のレンズ駆動装置１０Ｂでは、上側弾性部材２２は、駆動コイル１６への無通電時に、レンズ体１４に、矢印Ａ１で示すような、下向きの付勢力を付与するように取り付けられており、下側弾性部材２４は、駆動コイル１６への無通電時に、レンズ体１４に、矢印Ａ２で示すような、上向きの付勢力を付与するように取り付けられている。下向きの付勢力Ａ１と上向きの付勢力Ａ２とは実質的に同じである。すなわち、駆動コイル１６への無通電時に、レンズ体１４に対して上側弾性部材２２および下側弾性部材２４によって上下各々逆方向の付勢力を与えている。図示の例では、上側弾性部材２２および下側弾性部材２４により、レンズ体１４を挟み込む方向に付勢力Ａ１、Ａ２を与えている。 In the illustrated lens driving device 10B, the upper elastic member 22 is attached so as to apply a downward biasing force to the lens body 14 as indicated by an arrow A1 when the drive coil 16 is not energized. The side elastic member 24 is attached so as to apply an upward biasing force to the lens body 14 as indicated by an arrow A2 when the drive coil 16 is not energized. The downward biasing force A1 and the upward biasing force A2 are substantially the same. In other words, when the drive coil 16 is not energized, the upper elastic member 22 and the lower elastic member 24 apply urging forces in opposite directions to the lens body 14. In the illustrated example, the upper elastic member 22 and the lower elastic member 24 apply urging forces A1 and A2 in a direction in which the lens body 14 is sandwiched.
　このような構成により、外部から加えられるレンズ駆動装置１０Ｂの振動や衝撃に対して、レンズ体１４の動きを鈍化させることができる。したがって、駆動コイル１６への無通電時及びレンズモジュールを使用した撮影時に、レンズ駆動装置１０Ｂにかかる振動によりレンズ体１４が振動するのを抑制することができる。すなわち、レンズ駆動装置１０Ｂは振動に強いという利点がある。また、上側弾性部材２２および下側弾性部材２４により、レンズ体１４を挟み込む方向に付勢力Ａ１、Ａ２を与えているので、弾性部材２２、２４とレンズ体１４との間の結合力を向上させることができる。 With such a configuration, it is possible to slow down the movement of the lens body 14 against the vibration and impact of the lens driving device 10B applied from the outside. Therefore, it is possible to suppress the lens body 14 from vibrating due to the vibration applied to the lens driving device 10B when the drive coil 16 is not energized and when photographing using the lens module. That is, the lens driving device 10B has an advantage of being strong against vibration. Further, since the urging forces A1 and A2 are applied in the direction in which the lens body 14 is sandwiched by the upper elastic member 22 and the lower elastic member 24, the coupling force between the elastic members 22 and 24 and the lens body 14 is improved. be able to.
　図９は本発明の第４の実施の形態に係るレンズ駆動装置１０Ｃのレンズ体１４の支持方法を示す概略正面断面図である。図示のレンズ駆動装置１０Ｃは、レンズ体１４の支持方法が相違する点を除いて、前述したレンズ駆動装置１０、１０Ａと同様の構成を有する。 FIG. 9 is a schematic front sectional view showing a method for supporting the lens body 14 of the lens driving device 10C according to the fourth embodiment of the present invention. The illustrated lens driving device 10C has the same configuration as the lens driving devices 10 and 10A described above except that the method for supporting the lens body 14 is different.
　図示のレンズ駆動装置１０Ｃでは、上側弾性部材２２は、レンズ体１４に、駆動コイル１６への無通電時に、矢印Ｂ１で示すような、上向きの付勢力を付与するように取り付けられており、下側弾性部材２４は、レンズ体１４に、駆動コイル１６への無通電時に、矢印Ｂ２で示すような、下向きの付勢力を付与するように取り付けられている。上向きの付勢力Ｂ１と下向きの付勢力Ｂ２とは実質的に同じである。すなわち、駆動コイル１６への無通電時に、レンズ体１４に対して上側弾性部材２２および下側弾性部材２４によって上下各々逆方向の付勢力を与えている。図示の例では、上側弾性部材２２および下側弾性部材２４により、レンズ体１４を伸張させる方向に付勢力Ｂ１、Ｂ２を与えている。 In the illustrated lens driving device 10C, the upper elastic member 22 is attached to the lens body 14 so as to apply an upward biasing force as indicated by an arrow B1 when the drive coil 16 is not energized. The side elastic member 24 is attached to the lens body 14 so as to apply a downward urging force as indicated by an arrow B2 when the drive coil 16 is not energized. The upward biasing force B1 and the downward biasing force B2 are substantially the same. In other words, when the drive coil 16 is not energized, the upper elastic member 22 and the lower elastic member 24 apply urging forces in opposite directions to the lens body 14. In the illustrated example, the upper elastic member 22 and the lower elastic member 24 apply urging forces B1 and B2 in the direction in which the lens body 14 is extended.
　このような構成により、外部から印加されるレンズ駆動装置１０Ｃの振動や衝撃に対して、レンズ体１４の動きを鈍化させることができる。したがって、駆動コイル１６への無通電時及びレンズモジュールを使用した撮影時に、レンズ駆動装置１０Ｃにかかる振動によりレンズ体１４が振動するのを抑制することができる。すなわち、レンズ駆動装置１０Ｃは振動に強いという利点がある。 With such a configuration, it is possible to slow down the movement of the lens body 14 against the vibration and impact of the lens driving device 10C applied from the outside. Therefore, it is possible to suppress the lens body 14 from vibrating due to vibration applied to the lens driving device 10C when the drive coil 16 is not energized and when photographing is performed using the lens module. That is, the lens driving device 10C has an advantage of being strong against vibration.
　図８及び図９に示したレンズ駆動装置１０Ｂ、１０Ｃでは、弾性部材２２、２４をレンズ体１４に結合しているが、弾性部材２２、２４をレンズ体１４の周りの可動部材（例えば、駆動コイル１６など）に結合してもよい。また、弾性部材として、１枚の上側弾性部材２２と１枚の下側弾性部材２４とを備えているが、複数枚の上側弾性部材と複数枚の下側弾性部材とを備えてもよい。 In the lens driving devices 10B and 10C shown in FIGS. 8 and 9, the elastic members 22 and 24 are coupled to the lens body 14, but the elastic members 22 and 24 are movable members around the lens body 14 (for example, driving) The coil 16 or the like). Moreover, although the one upper elastic member 22 and the one lower elastic member 24 are provided as the elastic members, a plurality of upper elastic members and a plurality of lower elastic members may be provided.
　上記本発明の例示的な態様によるレンズ駆動装置において、上側弾性部材及び下側弾性部材の各々は、レンズ体に取り付けられた内周側端部と、外側ヨークに取り付けられた外周側端部とを有してよい。外側ヨークは、永久磁石を内壁に備える外筒部と、この外筒部の上端に設けられた外側リング端部とを有するものであってよい。この場合、外側リング端部の内壁に、レンズ体にかかる衝撃を緩和するための緩衝部材を備えることが好ましい。 In the lens driving device according to the exemplary aspect of the present invention, each of the upper elastic member and the lower elastic member includes an inner peripheral end attached to the lens body, and an outer peripheral end attached to the outer yoke. May be included. The outer yoke may have an outer cylinder part provided with a permanent magnet on the inner wall and an outer ring end part provided at the upper end of the outer cylinder part. In this case, it is preferable to provide a buffer member on the inner wall of the end portion of the outer ring for reducing the impact applied to the lens body.
　また、上記本発明の例示的な態様によるレンズ駆動装置において、光軸方向の下方に配置されたアクチュエータ・ベースを備えてよい。この場合、アクチュエータ・ベースの内壁に、レンズ体にかかる衝撃を緩和するための緩衝部材を備えることが好ましい。レンズ駆動装置は、下側弾性部材の外周側端部を、スペーサを介して固定するための内側ヨークを更に有してよく、内側ヨークは、外側ヨークの外筒部の下端で取り付けられた内側リング端部と、この内側リング端部の内側で、光軸と平行に垂直上方へ延在する複数の垂直延在部と、から構成されてよい。この場合、複数の垂直延在部の内壁に、レンズ体にかかる衝撃を緩和するための緩衝部材を備えることが好ましい。尚、内側ヨークの複数の垂直延在部と永久磁石との間に駆動コイルが配置される。複数の垂直延在部は、下側弾性部材の外周側端部と内周側端部との間の隙間を介して、垂直に上方へ延在する。 Further, the lens driving device according to the exemplary embodiment of the present invention may include an actuator base disposed below in the optical axis direction. In this case, it is preferable that the inner wall of the actuator base is provided with a buffer member for reducing the impact applied to the lens body. The lens driving device may further include an inner yoke for fixing the outer peripheral end portion of the lower elastic member via a spacer, and the inner yoke is an inner side attached at the lower end of the outer cylindrical portion of the outer yoke. A ring end portion and a plurality of vertically extending portions extending vertically upward in parallel to the optical axis inside the inner ring end portion may be configured. In this case, it is preferable to provide a buffer member for alleviating the impact applied to the lens body on the inner walls of the plurality of vertically extending portions. A drive coil is disposed between the plurality of vertically extending portions of the inner yoke and the permanent magnet. The plurality of vertically extending portions extend vertically upward through a gap between the outer peripheral end and the inner peripheral end of the lower elastic member.
　上記本発明の例示的な態様によるレンズ駆動装置において、駆動コイルはレンズ体を、直接、保持している。駆動コイルは、その内面に、レンズ体を位置決めするための段差を持つことが好ましい。 In the lens driving device according to the exemplary embodiment of the present invention, the driving coil directly holds the lens body. The drive coil preferably has a step on the inner surface for positioning the lens body.
　更に、上記本発明の例示的な態様によるレンズ駆動装置において、上側弾性部材および下側弾性部材は、駆動コイルへの無通電時に、レンズ体に対して互いに逆方向でかつ実質的に等しい付勢力を付与するように取り付けられていることが望ましい。上記本発明によるレンズ駆動装置において、上側弾性部材および下側弾性部材は、レンズ体を挟み込む方向に、付勢力を与えることが好ましい。 Furthermore, in the lens driving device according to the exemplary aspect of the present invention, the upper elastic member and the lower elastic member are biased in the opposite directions and substantially equal to the lens body when the drive coil is not energized. It is desirable to be attached so as to give In the lens driving device according to the present invention, it is preferable that the upper elastic member and the lower elastic member give a biasing force in a direction in which the lens body is sandwiched.
　以上、本発明を、その実施の形態を参照して特に示し説明してきたが、本発明はこれら実施の形態に限定されない。当業者によって、請求の範囲に規定された本発明の精神と範囲を逸脱せずに、形式や詳細において種々の変形がなされると理解される。 Although the present invention has been particularly shown and described with reference to the embodiments, the present invention is not limited to these embodiments. It will be understood by those skilled in the art that various modifications can be made in form and detail without departing from the spirit and scope of the invention as defined in the claims.
　本発明は、２００８年５月２０日に出願した、日本国の特許出願第２００８－１３１５８１号に基き、優先権の利益を主張するものであり、その開示は、参考文献として全体としてここに組み入れられる。 The present invention claims the benefit of priority based on Japanese Patent Application No. 2008-131581 filed on May 20, 2008, the disclosure of which is incorporated herein by reference in its entirety. It is done.

Claims (11)

  1. 　レンズを含む筒状のレンズ体(１４)と、
    　該レンズ体の周囲に位置するように固定された駆動コイル（１６）と、
    　該駆動コイルと対向する永久磁石(１８)と、
    　内壁に前記永久磁石を備えた外側ヨーク(２０；２０Ａ)と、
    　前記レンズ体の光軸（Ｏ）方向両側に設けられ、前記レンズ体を径方向に位置決めした状態で光軸方向に変位可能に支持する上側弾性部材(２２)および下側弾性部材（２４）と、
    を備えたレンズ駆動装置(１０；１０Ａ；１０Ｂ；１０Ｃ)であって、
    　前記駆動コイル（１６）に通電することで、前記永久磁石(１８)の磁界と前記駆動コイル（１６）に流れる電流による磁界との相互作用によって、前記レンズ体(１４)を光軸（Ｏ）方向に位置調整可能な前記レンズ駆動装置において、
    　前記駆動コイル（１６）への無通電時に、前記レンズ体（１４）は、無限遠位置（ＰＩＤ）およびマクロ位置(ＰＭＡ)を除いた前記光軸（Ｏ）方向のレンズ焦点調整領域(ＡＦＡ)に置かれているレンズ駆動装置。     A cylindrical lens body (14) including a lens;
    A drive coil (16) fixed to be located around the lens body;
    A permanent magnet (18) facing the drive coil;
    An outer yoke (20; 20A) having the permanent magnet on the inner wall;
    An upper elastic member (22) and a lower elastic member (24) which are provided on both sides of the lens body in the optical axis (O) direction and support the lens body so as to be displaceable in the optical axis direction while being positioned in the radial direction; ,
    A lens driving device (10; 10A; 10B; 10C) comprising:
    By energizing the drive coil (16), the lens body (14) is moved along the optical axis (O) by the interaction between the magnetic field of the permanent magnet (18) and the magnetic field generated by the current flowing through the drive coil (16). In the lens driving device capable of adjusting the position in the direction,
    When the drive coil (16) is not energized, the lens body (14) has a lens focus adjustment region in the optical axis (O) direction excluding the infinity position (P ID ) and the macro position (P MA ) ( A FA ) lens driving device.
  2. 　前記上側弾性部材（２２）及び前記下側弾性部材（２４）の各々は、
    　前記レンズ体（１４）に取り付けられた内周側端部（２２２；２４２）と、
    　前記外側ヨーク（２０；２０Ａ）に取り付けられた外周側端部(２２４；２４４)と、
    を有する、請求項１に記載のレンズ駆動装置。     Each of the upper elastic member (22) and the lower elastic member (24)
    An inner peripheral end (222; 242) attached to the lens body (14);
    An outer peripheral end (224; 244) attached to the outer yoke (20; 20A);
    The lens driving device according to claim 1, comprising:
  3. 　前記外側ヨーク(２０；２０Ａ)は、
    　前記永久磁石(１８)を内壁に備える外筒部（２０２；２０２Ａ）と、
    　該外筒部の上端に設けられた外側リング端部(２０４；２０４Ａ)とを有し、
    　前記外側リング端部(２０４；２０４Ａ)の内壁に、前記レンズ体（１４）にかかる衝撃を緩和するための緩衝部材(３２)を備えている、請求項２に記載のレンズ駆動装置（１０；１０Ａ）。     The outer yoke (20; 20A)
    An outer cylinder (202; 202A) comprising the permanent magnet (18) on the inner wall;
    An outer ring end (204; 204A) provided at the upper end of the outer cylinder part,
    The lens driving device (10;) according to claim 2, further comprising a buffer member (32) for reducing an impact applied to the lens body (14) on an inner wall of the outer ring end (204; 204A). 10A).
  4. 　前記光軸（Ｏ）方向の下方に配置されたアクチュエータ・ベース（１２Ａ）を備え、
    　該アクチュエータ・ベース（１２Ａ）の内壁に、前記レンズ体（１４）にかかる衝撃を緩和するための緩衝部材（３６）を備える、請求項２又は３に記載のレンズ駆動装置（１０Ａ）。     An actuator base (12A) disposed below the optical axis (O) direction;
    The lens driving device (10A) according to claim 2 or 3, further comprising a buffer member (36) for reducing an impact applied to the lens body (14) on an inner wall of the actuator base (12A).
  5. 　前記下側弾性部材(２４)の前記外周側端部（２４４）を、スペーサ（２８）を介して固定するための内側ヨーク(３０)を更に有し、
    　前記内側ヨーク(３０)は、
    　前記外側ヨーク(２０Ａ)の前記外筒部（２０２Ａ）の内壁に下端で取り付けられた内側リング端部(３０２)と、
    　該内側リング端部の内側で、前記光軸（Ｏ）と平行に垂直上方へ延在する複数の垂直延在部（３０４）と、から構成され、
    　前記複数の垂直延在部の内壁に、前記レンズ体（１４）にかかる衝撃を緩和するための緩衝部材(３８)を備える、請求項２乃至４のいずれか１つに記載のレンズ駆動装置(１０Ａ)。     An inner yoke (30) for fixing the outer peripheral end (244) of the lower elastic member (24) via a spacer (28);
    The inner yoke (30)
    An inner ring end (302) attached at the lower end to the inner wall of the outer cylinder (202A) of the outer yoke (20A);
    A plurality of vertically extending portions (304) extending vertically upward in parallel to the optical axis (O) inside the inner ring end portion;
    The lens driving device (1) according to any one of claims 2 to 4, further comprising a buffer member (38) for reducing an impact applied to the lens body (14) on an inner wall of the plurality of vertically extending portions. 10A).
  6. 　前記内側ヨーク(３０)の前記複数の垂直延在部(３０４)と前記永久磁石(１８)との間に前記駆動コイル（１６）が配置されている、請求項５に記載のレンズ駆動装置(１０Ａ)。 The lens driving device according to claim 5, wherein the driving coil (16) is disposed between the plurality of vertically extending portions (304) of the inner yoke (30) and the permanent magnet (18). 10A).
  7. 　前記複数の垂直延在部（３０４）は、前記下側弾性部材（２４）の前記外周側端部（２４４）と前記内周側端部（２４２）との間の隙間を介して、垂直に上方へ延在している、請求項６に記載のレンズ駆動装置（１０Ａ）。 The plurality of vertically extending portions (304) are vertically arranged through a gap between the outer peripheral end (244) and the inner peripheral end (242) of the lower elastic member (24). The lens driving device (10A) according to claim 6, wherein the lens driving device (10A) extends upward.
  8. 　前記駆動コイル（１６）は前記レンズ体（１４）を、直接、保持している、請求項１乃至７のいずれか１つに記載のレンズ駆動装置（１０；１０Ａ）。 The lens driving device (10; 10A) according to any one of claims 1 to 7, wherein the driving coil (16) directly holds the lens body (14).
  9. 　前記駆動コイル(１６)は、その内面に、前記レンズ体(１４)を位置決めするための段差（１６３)を持つ、請求項８に記載のレンズ駆動装置(１０；１０Ａ)。 The lens driving device (10; 10A) according to claim 8, wherein the driving coil (16) has a step (163) for positioning the lens body (14) on an inner surface thereof.
  10. 　前記上側弾性部材(２２)および前記下側弾性部材(２４)は、前記駆動コイル(１６)への無通電時に、前記レンズ体（１４）に対して互いに逆方向でかつ実質的に等しい付勢力（Ａ１，Ａ２；Ｂ１，Ｂ２）を付与するように取り付けられている、請求項１乃至９のいずれか１つに記載のレンズ駆動装置（１０Ｂ；１０Ｃ）。 The upper elastic member (22) and the lower elastic member (24) are biased in opposite directions and substantially equal to the lens body (14) when the drive coil (16) is not energized. The lens driving device (10B; 10C) according to any one of claims 1 to 9, wherein the lens driving device (10B; 10C) is attached so as to impart (A1, A2; B1, B2).
  11. 　前記上側弾性部材(２２)および前記下側弾性部材(２４)は、前記レンズ体(１４)を挟み込む方向に、前記付勢力(Ａ１，Ａ２)を与える、請求項１０に記載のレンズ駆動装置（１０Ｂ）。 The lens driving device according to claim 10, wherein the upper elastic member (22) and the lower elastic member (24) apply the urging force (A1, A2) in a direction in which the lens body (14) is sandwiched. 10B).
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