WO2010098340A1 - Dispositif d'entraînement et dispositif d'entraînement de lentille - Google Patents

Dispositif d'entraînement et dispositif d'entraînement de lentille Download PDF

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Publication number
WO2010098340A1
WO2010098340A1 PCT/JP2010/052827 JP2010052827W WO2010098340A1 WO 2010098340 A1 WO2010098340 A1 WO 2010098340A1 JP 2010052827 W JP2010052827 W JP 2010052827W WO 2010098340 A1 WO2010098340 A1 WO 2010098340A1
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WO
WIPO (PCT)
Prior art keywords
lever
driven body
support
lens
driving device
Prior art date
Application number
PCT/JP2010/052827
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English (en)
Japanese (ja)
Inventor
篤広 野田
滋 和田
Original Assignee
コニカミノルタオプト株式会社
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 コニカミノルタオプト株式会社 filed Critical コニカミノルタオプト株式会社
Priority to JP2011501612A priority Critical patent/JP5447501B2/ja
Publication of WO2010098340A1 publication Critical patent/WO2010098340A1/fr

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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
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
    • F03G7/06—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like
    • F03G7/065—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using expansion or contraction of bodies due to heating, cooling, moistening, drying or the like using a shape memory element

Definitions

  • the present invention relates to a driving device that drives a small and fine driven body, such as a lens of a digital camera mounted on a mobile phone, a portable information terminal, or the like.
  • Small mobile terminals such as mobile phones, personal digital assistants (PDAs), and portable music players are often equipped with digital cameras for taking images.
  • PDAs personal digital assistants
  • digital cameras for taking images.
  • a method for photographing a high-quality image with the digital camera a method of adding an optical function such as a focus function and a zoom function to the digital camera is used.
  • a driving device for driving the lens (and the lens support) provided in the digital camera It is mounted in a limited space of the digital camera, and the driving device mounted on the digital camera needs to be small and light.
  • a drive device including a shape memory alloy (hereinafter referred to as SMA) actuator has been proposed.
  • a driving device that suppresses such inclination
  • a driving device that is arranged in parallel with the moving direction of the driven body and includes a columnar guide pole and a guide shaft that guide the driven body.
  • the driven body moves while being guided by the guide pole and the guide shaft. Therefore, even when the driven body is pressed in a single-pressed state, the driven body is not moved. It is hard to tilt.
  • this driving device as a moving device for a lens support holding a lens, it is possible to prevent the lens support from tilting (hereinafter referred to as tilt) when the lens support moves (for example, Japanese Patent Application Laid-Open No. 2007-2007). No. -58075, JP 2007-58076, JP 2007-60530, etc.).
  • the image is guided by the guide pole and the guide shaft as described above. Further, it was possible to perform photographing with sufficient definition by using the lens driving unit.
  • an image sensor of a digital camera mounted on a small portable terminal has an increased number of pixels, and in order to use an image sensor with a higher pixel, a lens having a high performance is required. Therefore, in the conventional lens driving unit that guides the movement of the lens support by the guide members of the guide pole and the guide shaft, even if the tilt is generated by the play between the guide member and the lens support, the image Cause disturbance.
  • a driving device there is one that holds both sides in the moving direction of a driven body (lens support holding a lens) with parallel leaf springs in order to achieve further miniaturization and weight reduction.
  • a driven body lens support holding a lens
  • parallel leaf springs in order to achieve further miniaturization and weight reduction.
  • it is difficult to suppress the occurrence of tilt.
  • an object of the present invention is to provide a small-sized drive device that drives a driven body and that can accurately move the driven body.
  • the present invention provides a support leg, a lever part rotatably supported by the support leg part, and is connected to the lever part and engaged with a driven body in at least two places.
  • a displacement output portion, and a shape memory alloy actuator that engages with the lever portion and reversibly deforms, and the displacement output portion coupled to the lever portion by deformation of the shape memory alloy actuator includes the driven body And a lever support part that protrudes from one of the support leg part and the lever part and has an engagement part at the tip, and is formed on the other side.
  • the lever portion passes through a contact portion between the engagement portion and the support recess or the vicinity thereof, and a rotation axis that is orthogonal to or intersects with the moving direction of the driven body. Pivotable and Pivotably to the rotating shaft or about the swing axis orthogonal or intersect with the rotation axis line parallel to, and is supported by the support leg.
  • the displacement output portion is attached to be inclined with respect to the lever portion. Even if it is, the lever portion is swung, and a uniform displacement is output from each displacement output portion to the driven body.
  • the lever portion may be supported by the contact portion between the engagement portion of the lever support portion and the support recess.
  • the engagement portion and the support recess may be in contact at one point, may be in contact at least at three points, or may be in contact with a curved surface.
  • Examples of the supporting concave portion include conical shapes such as a cone, a triangular pyramid, and a quadrangular pyramid, a spherical shape, and a smooth curved surface shape.
  • examples of the shape of the engaging portion include a cone shape such as a cone, a triangular pyramid, and a quadrangular pyramid, a spherical shape, and a columnar shape such as a cylinder.
  • the thing which contacts at least 3 or more points is preferable in consideration of stability.
  • it is preferable that at least one of them has a shape based on a circle or a sphere.
  • the lever support portion includes a swing shaft portion that is swingably inserted into a swing hole formed in either the support leg portion or the lever portion, and the engagement portion is An engaging shaft portion extending in a direction perpendicular to or intersecting with the central axis of the swinging shaft portion or a line parallel to the central axis; and the support recess slides the engaging shaft portion around the central axis. It may be a concave groove shape that is movably supported.
  • the present invention provides a support leg, a lever part rotatably supported by the support leg part, and is connected to the lever part and engaged with a driven body in at least two places.
  • the lever portion is swung by deformation of the shape memory alloy actuator, and the displacement output portion is A driving device for moving the driven body in a predetermined direction, wherein the plurality of displacement output portions are moved in the direction along the moving direction of the driven body according to the inclination of the lever, You may provide the displacement adjustment part which balances and engages a displacement output part with this to-be-driven body.
  • the driven body Even when the displacement output part is inclined with respect to the lever part, when the displacement adjustment part adjusts the displacement of each displacement output part and the lever part moves, the driven body It is possible to output displacement in a balanced manner. Thereby, it is possible to suppress the occurrence of problems that the driven body is tilted or the moving direction of the driven body is shifted.
  • the plurality of displacement output units may be attached to the lever unit via an arm unit that surrounds a part of the driven body from the side, and the plurality of displacement output units are connected to the driven unit. It is attached to the lever part via an arm part that surrounds a part of the body from the side, and the displacement adjustment part is formed on at least a part of the arm part, and the arm part is the displacement adjustment part It may be elastically deformable.
  • an urging member that urges the driven body with a force in a direction opposite to the force received by the driven body from the displacement output unit may be provided.
  • the lever portion can be of a shape that is stationary when the driving force from the shape memory alloy actuator balances the drag force that the displacement output portion receives from the driven body.
  • it may include a pair of parallel springs arranged so as to be parallel to each other and holding the driven body from both the front and rear sides in the moving direction, and at least a part of the driven body You may provide the guide part which contacts and is arrange
  • the SMA actuator can be a linear one.
  • a lens driving device that drives a lens unit including a lens as the driven body can be given.
  • the present invention is a small driving device for driving a driven body, and the driven body can be moved with high accuracy.
  • FIG. 2 is a schematic layout diagram when the imaging apparatus shown in FIG. 1 is viewed in the direction of arrow II.
  • FIG. 3 is a schematic layout diagram when the imaging apparatus shown in FIG. 1 is viewed in the direction of arrow III. It is the figure seen from the arrow II side when the actuator used for the imaging device shown in FIG. 1 was operated. It is the figure seen from the arrow III side when the actuator used for the imaging device shown in FIG. 1 was operated. It is a figure of the imaging device provided with the lens drive device in which the arm part inclines. It is a figure in the middle of assembling the actuator of the lens drive device shown in FIG.
  • FIG. 1 is a plan view of an image pickup apparatus in which the drive device according to the present invention is used
  • FIG. 2 is a schematic arrangement view when the image pickup apparatus shown in FIG. 1 is viewed in the direction of arrow II
  • FIG. FIG. 3 is a schematic layout diagram when the imaging device shown in FIG. 1 is viewed in the direction of arrow III.
  • 1 omits the upper surface of the case, the top plate, the leaf spring, and the bias spring for convenience of explanation, and omits the side portions of the case in FIGS. 2 and 3.
  • the upper and lower positional relationships are the positional relationships in the drawings.
  • the imaging apparatus A includes a case Ca that is a box having a square shape in plan view, an image sensor Ims that includes an individual imaging element for capturing an image, and a lens that causes the photoelectric conversion unit of the image sensor Ims to capture a subject image. And a lens driving device La for driving.
  • Case Ca forms the outer shell of the image pickup apparatus A, and suppresses the incidence of light other than the imaging light from the outside, the entry of foreign matter, and the impact and / or vibration on the members disposed inside.
  • Case Ca is formed of a resin or the like, and is a box having a rectangular parallelepiped shape with a rectangular bottom (here, square).
  • An imaging window Cw for allowing imaging light to enter is formed on the upper surface of the case Ca.
  • the imaging window Cw is formed so that the optical axis Ax of the imaging device A passes through the center.
  • the image sensor Ims includes a solid-state image sensor that converts irradiated imaging light into an electrical signal.
  • a sensor using a CMOS type sensor or a CCD imaging sensor is adopted for the photoelectric conversion unit.
  • the image sensor Ims has a rectangular plate shape in plan view.
  • the long side and the short side are parallel to the diagonal lines on the bottom surface of the case Ca, and the center is the optical axis Ax of the imaging apparatus A. They are arranged so as to overlap.
  • the lens driving device La using the driving device which is the main part of the present invention will be described.
  • the lens driving device La is disposed inside the case Ca.
  • the lens driving device La includes a plate-like base portion 1 in which a through hole 10 is formed in the center, a top plate portion 2 in which a through hole 20 having the same size as the base portion 1 is formed in the center, and an image sensor Ims.
  • a lens unit 3 having a lens for picking up a subject image, a driving device 4 for moving the lens unit 3 toward and away from the image sensor Ims, and a base unit 1 and a top plate unit 2 are fixed to the lens unit 3 and held.
  • An upper leaf spring 51, a lower leaf spring 52, and a bias spring 6 that presses the lens unit 3 are provided.
  • the base portion 1 is a flat plate having a square shape in plan view, and is a fixed member that is fixed to the case Ca and forms the bottom portion of the lens driving device La.
  • the top plate portion 2 is a flat plate-like member, and is arranged so as to be parallel to the base portion 1.
  • a through hole 10 and a through hole 20 are formed in the base portion 1 and the top plate portion 2.
  • the through hole 10 is a cylindrical hole having an inner diameter smaller than the outer diameter of the lens unit 3 and larger than an imaging lens 31 (described later) disposed in the lens unit 3. Further, the inner diameter of the through hole 10 is a size that does not prevent the light from entering the image sensor Ims.
  • the through hole 20 is a cylindrical hole having an inner diameter larger than the outer diameter of the lens unit. The central axes of the through hole 10 and the through hole 20 both overlap the optical axis Ax of the imaging device A.
  • a lower leaf spring 52 and an upper leaf spring 51 are respectively attached to the upper surface of the base portion 1 and the lower surface of the top plate portion 2.
  • the upper leaf spring 51 and the lower leaf spring 52 are parallel to each other and sandwich the lens unit 3 from above and below.
  • the upper leaf spring 51 and the lower leaf spring 52 are formed with holes for allowing imaging light to pass therethrough.
  • the lens unit 3 includes an imaging lens 31 and a lens holding frame 32 on which the imaging lens 31 is held.
  • the imaging lens 31 is a lens group including an objective lens, a focus lens, a zoom lens, and the like.
  • An imaging optical system that guides imaging light incident from the imaging window Cw to the image sensor Ims and forms a subject image on the image sensor Ims. It constitutes.
  • the imaging lens 31 is a lens group composed of a plurality of lenses, but may be composed of a single lens.
  • the lens holding frame 32 is a cylindrical frame (so-called ball frame), and holds the imaging lens 31 therein.
  • the upper surface is held by the upper plate spring 51 and the lower surface is held by the lower plate spring 52, and the central axis of the lens holding frame 32 overlaps the optical axis Ax. Further, since the lens holding frame 32 is sandwiched between the upper plate spring 51 and the lower plate spring 52, the degree of freedom of displacement of the lens unit 3 is restricted in the direction along the optical axis Ax. When the lens unit 3 moves in the direction along the axis, the lens unit 3 moves so as to penetrate the through hole 20 of the top plate 2.
  • the lens holding frame 32 includes two convex portions 33 projecting radially outward in the vicinity of the upper surface of the outer peripheral portion.
  • the two convex portions 33 are formed so as to be equidistant from the upper surface, and are formed at symmetrical positions across the central axis.
  • the convex portions 33 are arranged side by side in the diagonal direction of the base portion 1, and the convex portions 33 are arranged in the vicinity of the opposite corner portions of the case Ca.
  • the driving device 4 applies a driving force to the lens unit 3.
  • the drive device 4 is formed of a lever portion 41, a support leg portion 42 that supports the lever portion 41, an arm portion 43 that is fixed to the lever portion 41, and a shape memory alloy (hereinafter referred to as SMA),
  • SMA shape memory alloy
  • An SMA actuator 44 provided on a displacement input portion 412 (described later) formed on the lever portion 41 and electrodes 45 for fixing both ends of the SMA actuator 44 and supplying electricity to the SMA actuator 44 are provided.
  • the lever portion 41 has a rectangular parallelepiped shape, and a support concave portion 411 which is a conical concave portion is formed at the approximate center of one surface in the vertical direction.
  • a displacement input portion 412 in which the SMA actuator 44 is installed on the surface opposite to the support recess 411 is formed at the lower end portion.
  • the portion of the lever portion 41 where the displacement input portion 412 is formed is formed in a curved surface shape so that stress is not concentrated on the SMA actuator 44.
  • the displacement input portion 412 has a V-shaped groove shape along the curved surface so that the SMA actuator 44 does not come off when the lever portion 41 moves.
  • the support leg portion 42 is a quadrangular columnar member fixed to the base portion 1.
  • the support leg portion 42 is disposed close to a corner portion different from the corner portion where the convex portion 33 of the case Ca is close.
  • the support leg portion 42 includes a conical lever support portion 421 that protrudes from a surface opposite to the surface facing the lens unit 3 and is inserted into the support recess 411.
  • the lever support portion 421 is formed such that the central axis (swing axis Bx) is orthogonal to the direction in which the convex portions 33 are arranged or a direction parallel thereto.
  • the lever support portion 421 is disposed so that the tip thereof is in contact with the conical apex portion of the support recess 411.
  • the lever support portion 421 may be formed integrally with the support leg portion 42 or may be fixed to the support leg portion 42 separately from the support leg portion 42.
  • the support concave portion 411 and the lever support portion 421 form a support portion, and the lever support portion 421 supports the lever portion 41 with a point by the engagement portion at the tip thereof contacting the deepest portion of the support concave portion 411. Yes.
  • the lever portion 41 can swing around the swing axis Bx and can also rotate around an axis (rotation axis Cx) intersecting the swing axis Bx (or perpendicular to the displacement direction). Yes.
  • the balance of forces acting on the lever portion 41 will be described later.
  • the arm portion 43 is disposed on both side surfaces adjacent to the surface on which the support concave portion 411 of the lever portion 41 is formed.
  • the arm part 43 is divided into two parts, and each arm part 43 extends in the vicinity of the lens unit 3 evenly.
  • the arm part 43 is bent halfway, and a displacement output part 431 is formed on the tip side.
  • Displacement output portions 431 formed on both the forked arm portions 43 are parallel to each other and are in contact with the lower portion of the convex portion 33.
  • the displacement output part 431 includes a locking part 432 cut out so that the engagement surface with the convex part 33 is a curved surface.
  • the arm part 43 and the lever part 41 may be formed integrally, and may be formed separately.
  • the SMA actuator 44 for example, a Ni-Ti alloy or the like formed in a wire shape can be cited.
  • the SMA actuator is not limited to a wire-like one, and a shape (for example, a belt shape, a plate shape, etc.) that can move the arm portion can be widely used.
  • SMA has a crystalline phase that changes with its own temperature.
  • the SMA actuator 44 is transformed into a martensite phase when in a low temperature state and into an austenite phase when in a high temperature state.
  • the SMA actuator 44 repeats the phase transformation reversibly according to the temperature change.
  • the SMA actuator 44 expands or contracts due to phase transformation.
  • the SMA actuator 44 is a conductor having a predetermined electrical resistance, Joule heat is generated by energizing the SMA actuator from the electrode 45.
  • the SMA actuator 44 becomes a high temperature state due to the Joule heat, and heat is released by reducing the amount of current supplied from the high temperature state or by cutting off the current supply, resulting in a low temperature state.
  • the SMA actuator 44 is installed on the displacement input portion 412 of the lever portion 41, and is arranged in a V shape that is folded back by the lever portion 41. Both end portions of the SMA actuator 44 are fixed by electrodes 45 in the vicinity of the convex portion 33. The electrode 45 is fixed to the base portion 1.
  • the SMA actuator 44 is installed on the displacement input unit 412 so as to be parallel to the base unit 1, and both ends thereof are fixed with electrodes 45.
  • the SMA actuator 44 contracts, the displacement input unit 412 is pulled by the SMA actuator 44.
  • a rotation moment about the support recess 411 acts on the lever portion 41.
  • the arm portion 43 rotates to lift the displacement output portion 431, the displacement output portion 431 pushes the convex portion 33, and the lens unit 3 is displaced.
  • the arm portion 43 and the displacement output portion 431 are formed so as to be symmetrical with respect to the lever portion 41, and the two convex portions 33 are formed symmetrically with respect to the central axis of the lens unit 3. Therefore, an equal force acts on the two convex portions 33. Thereby, the lens unit 3 is displaced so that the optical axis of the imaging lens 31 does not shift.
  • the electrode 45 has the same angle between each attached SMA actuator 44 and the diagonal of the base portion 1. Further, the length from each electrode 45 to the displacement input portion 412 is equal. Since both sides of the SMA actuator 44 sandwiching the displacement input portion 412 are arranged at the same length and at the same angle, the amount of expansion and contraction of the SMA actuator 44 on both sides of the displacement input portion 412 and the force caused by the extension and contraction are equal.
  • the SMA actuator 44 By installing the SMA actuator 44 as described above, it is possible to prevent the expansion / contraction amount of the SMA actuator 44 from being biased to either direction. As a result, the portion of the SMA actuator 44 that is installed on the displacement input portion 412 is less likely to be displaced from the displacement input portion 412. Since the deviation can be suppressed, the friction between the SMA actuator 44 and the displacement input unit 412 can be reduced. Further, the force due to the expansion and contraction of the SMA actuator 44 fixed to both the electrodes 45 acts equally (size and direction) on the displacement input unit 412. Thereby, the displacement direction of the displacement input part 412 becomes a direction orthogonal to the arrangement direction of the convex parts 33, that is, a direction parallel to the swing axis Bx.
  • the bias spring 6 is a compression coil spring having substantially the same diameter as the peripheral size of the lens holding frame 32.
  • the bias spring 6 has a lower end in contact with the upper surface of the lens holding frame 32 and an upper end in contact with the upper side of the case Ca. As a result, the bias spring 6 biases the lens holding frame 32 downward.
  • the bias spring 6 is arranged so as not to prevent the imaging light from entering the image sensor Ims.
  • the compression coil spring is mentioned as the bias spring 6, it is not limited to it, The thing of the shape different from coils, such as a leaf
  • FIG. 4 is a view as seen from the arrow II side when the actuator used in the image pickup apparatus shown in FIG. 1 is operated.
  • FIG. 5 is a view when the actuator used in the image pickup apparatus shown in FIG. 1 is operated. It is the figure seen from the arrow III side.
  • the lens unit 3 When the driving device 4 is not driven, as shown in FIG. 2, the lens unit 3 is in contact with the edge portion 100 of the through hole 10 formed in the base portion 1 and is stationary (base position). At this time, the upper surface of the lens unit 3 in the drawing is pushed downward by the bias spring 6 with the bias force F1. The lower surface of the lens unit 3 in the drawing is in contact with the edge portion 100 of the through hole 10 formed in the base portion 1, and the lens unit 3 receives the drag R 1 from the edge portion 100.
  • an SMA actuator 44 is installed on the displacement input portion 412 of the lever portion 41, and the SMA actuator 44 is fixed to the electrode 45 in a tensioned state.
  • the tensile force F ⁇ b> 2 due to the tension of the SMA actuator 44 acts on the displacement input unit 412.
  • a moment around the third axis Cx (counterclockwise in the figure) by the tensile force F2 acts on the lever portion 41 and the arm portion 43, and the moment causes a force in a direction opposite to the bias force F1 to the convex portion 33. It is working.
  • the lens unit 3 is stationary because the bias force F1, the drag force R1, and the moment force acting on the lens unit 3 are balanced.
  • the magnitude of the tensile force F2 can be set to such a level that the SMA actuator 44 is tensioned without sagging. It is also possible to increase the pulling force F2 so that the lens unit 3 does not come into contact with the edge portion 100 so that the bias force F1 and the force due to the moment are balanced, and the position is set as the base position.
  • the inner diameter of the through hole 10 is smaller than the outer diameter of the lens unit 3 and the edge portion 100 supports the bottom surface of the lens unit 3 in the figure, but the through hole 10 is described as an example.
  • a holding portion for holding the lens unit 3 from the peripheral edge portion 10 toward the center of the through hole 10 may be formed.
  • the holding unit the number that can stably hold the lens unit 3 is used, and a wide variety of holding units that do not hinder the incidence of light on the image sensor Ims can be used.
  • the SMA actuator 44 when the lens unit 3 is stopped at the base position, the SMA actuator 44 is not energized, is in a low temperature state (martensitic phase), and the SMA actuator 44 is in an extended state. Yes.
  • the SMA actuator 44 is energized from the electrode 45. As described above, the SMA actuator 44 is heated by Joule heat when energized. As a result, the SMA actuator 44 undergoes a phase transformation from the martensite phase to the austenite phase, and the SMA actuator 44 contracts.
  • the contraction force F ⁇ b> 3 acts on the displacement input unit 412 due to the contraction of the SMA actuator 44.
  • the contraction force F3 is larger than the tensile force F2, and a counterclockwise moment centering on the rotation axis Cx acting on the lever portion 41 is increased. This moment is transmitted to the arm portion 43 and the displacement output portion 431, the balance of force is lost, and the displacement output portion 431 pushes the convex portion 33 upward.
  • the convex portion 33 is pushed by the displacement output portion 431 and is displaced upward against the pressing force F ⁇ b> 1 applied from the bias spring 6.
  • the bias spring 6 is compressed by the movement of the lens unit 3, and pushes back the lens unit 3 with a repulsive force F4.
  • the lens unit 3 stops at a position where the force that pushes up the lens unit 3 by the contraction force F3 acting on the lever portion 41 and the force that pushes down the lens unit 3 by the repulsive force F4 are balanced.
  • the displacement output part 431 is provided with the latching
  • the bifurcated arm portion 43 is equally displaced on both sides.
  • the convex portions 33 arranged symmetrically with respect to the central axis are evenly pressed by the arm portion 43, so that the lens holding frame 32 is in a state where the central axis overlaps or substantially overlaps the optical axis Ax. Displace. That is, even if the lens unit 3 is displaced, the imaging lens 31 does not shift or tilt its optical axis with respect to the optical axis Ax of the imaging device A, and it is possible to suppress a decrease in imaging accuracy.
  • the driving device 4 can lift the lens unit 3 by energizing the SMA actuator 44 to perform the focus operation or the zoom operation.
  • the SMA actuator 44 can adjust the magnitude of the contraction force F3 by changing the heat generation amount according to the amount of current to be applied. That is, the driving device 4 can adjust the amount of movement of the lens unit 3 by controlling the amount of current to be applied.
  • the bias spring 6 compressed by the contraction force F3 extends. Accordingly, the repulsive force F4 acting on the lens unit 3 is reduced.
  • the bias spring 6 returns to its original length (returns to the state in which the pressing force F1 is applied from the bias spring 6 to the lens unit 3), and the SMA actuator 44 extends to the original length (from the SMA actuator 44 to the lever).
  • the portion 41 returns to the state where the tensile force F2 is applied). Finally, the lens unit 3 and the driving device 4 return to the base position.
  • the driving device 4 can displace the lens unit 3 along the optical axis Ax by turning on and off the SMA actuator 44. Further, by appropriately adjusting the amount of current to be supplied to the SMA actuator 44, it is possible to adjust the contraction force F3, move the lens unit 3 between predetermined positions, and stop at that position. As a result, even when the imaging apparatus A performs a focus operation and a zoom operation, the lens unit 3 can be moved without the optical axis of the imaging lens 31 being shifted or tilted. It is possible to form a subject image with high accuracy (high resolution).
  • the above-described lens driving device has been described with an example in which the bifurcated arm portion 43 is completely uniform.
  • processing errors processing accuracy
  • assembly errors assembly
  • the lens driving device La of the present invention is devised to displace the lens unit 3 with high accuracy even when the bifurcated arm portion 43 is not completely symmetric.
  • FIG. 6 is a diagram of an imaging apparatus provided with a lens driving device having an inclined arm portion
  • FIG. 7 is a diagram in the middle of assembling an actuator of the lens driving device shown in FIG. 6,
  • FIG. 8 is a lens shown in FIG. It is a figure of the state which the drive device lifted the lens unit.
  • symbol is attached
  • the arm portion 43 is formed to be inclined with respect to the lever portion 41.
  • the lens unit 3 is in a base position in which the upper surface in the drawing is pressed by the bias spring 6 and the lower surface in the drawing is in contact with the edge portion 100 of the through hole 10 formed in the base portion 1.
  • the SMA actuator 44 is installed on the displacement input portion 412, and a tensile force is applied to the displacement input portion 412.
  • the arm portion 43 is rotated around the rotation axis Cx, and the right displacement output portion 431R first comes into contact with the convex portion 33.
  • the right displacement output portion 431R is in contact with the convex portion 33, so that the lever portion 41 is centered on the support concave portion 411 and the left displacement output portion 431L is convex. It rotates until it abuts on the portion 33.
  • both the left and right displacement output portions 431L and 431R are in contact with the convex portion 33 and the SMA actuator 44 sags, both ends of the SMA actuator 44 are fixed to the electrode 45. (See FIG. 7).
  • This state is the base position, and in the lens unit 3, the bias force received from the bias spring 6, the drag force received from the edge 100 of the through hole 10, and the force generated by the moment of the SMA actuator 44 are balanced.
  • Unit 3 is stationary.
  • the tensile force from the SMA actuator 44 is increased, and the SMA actuator 44 is formed so that the lens unit 3 is lifted from the edge portion 100 of the through hole 10 formed in the base portion 1 to be the base position. May be.
  • the lens unit 3 is pushed and displaced by the displacement output portions 431L and 431R.
  • the lens unit 3 is stable (the optical axis of the imaging lens 31 overlaps or substantially overlaps the optical axis Ax). (See FIG. 8).
  • the driving of the lens driving device La is the same as described above, and a detailed description thereof is omitted.
  • the lever portion 41 can freely swing and rotate around the swing axis Bx and the rotation axis Cx.
  • the lens driving device La can correct the deviation by the support concave portion 411 and the lever support portion 421 even if the lever portion 41 and / or the arm portion 43 and the like are displaced due to an error during manufacture or assembly. Thereby, it is possible to suppress the occurrence of a problem that the lens unit 3 is displaced in a tilted state.
  • both the support recessed portion 411 and the lever support portion 421 have a conical shape, and the support recessed portion 411 has a conical shape having a larger spread angle. This is to reduce friction by preventing the outer wall surface of the lever support portion 421 from contacting the inner wall surface of the support recess 411 when the lever support portion 421 is inserted into the support recess 411.
  • the lever portion 41 can be rotated around the rotation axis Cx.
  • FIGS. 9 and 10 are enlarged schematic side views of a support recess and a lever support portion of another example of the drive device according to the present invention
  • FIG. 11 is a support recess and lever of another example of the drive device according to the present invention.
  • FIG. 12 is a schematic side view of a state in which the support portion is disassembled
  • FIG. 12 is a schematic side view of the state in which the drive device shown in FIG.
  • FIG. 13 is a side view of another example of the lever support portion shown in FIG. It is. 9 to 13 are enlarged views of the support concave portion of the arm portion, the lever support portion of the support leg portion, and the vicinity thereof.
  • the support concave portion 411 is a spherical concave portion, and the engaging portion 422 at the tip of the lever support portion 421 has a spherical convex shape.
  • the support recess 411 and the engagement portion 422 of the lever support portion 421 are sized to be engaged.
  • the support concave portion 411 and the engaging portion 422 of the lever support portion 421 are in contact with each other on a spherical surface (or a curved surface), they are more stable than in the case of contact with a point.
  • the lever portion 41 can not only swing around the swing axis Bx but also freely rotate around the rotation axis Cx.
  • the engaging portion 422 may be a spherical surface having a slightly small diameter.
  • the shape of the engaging portion 422 is not necessarily spherical, and may be a curved surface in which the cross section passing through the central axis always has the same shape, or a cylindrical shape.
  • the support concave portion 411 and the engaging portion 422 do not contact with each other over the entire surface, and become a circular contact surface.
  • the lever portion 41 can freely swing and rotate around the swing axis Bx and the rotation axis Cx.
  • the support recess 411 is a conical recess
  • the engagement portion 422 at the tip of the lever support portion 421 has a spherical shape.
  • the engaging part 422 of the lever support part 421 is a spherical shape
  • the contact part of the engaging part 422 and the support recessed part 411 becomes circular. Since both areas of the contact portions are larger than in the case of a cone, the lever portion 41 is stably supported. Further, since the engaging portion 422 has a spherical shape, the rotation about the rotation axis Cx is smoothly performed.
  • the shape of the support recess 411 may be a triangular pyramid or a quadrangular pyramid other than the cone. In the case of these pyramids, the contact area with the spherical engaging portion 422 is smaller than that of the cone, but the friction can be reduced accordingly. Further, since the spherical engaging portion 422 is in contact with each of the inclined surfaces forming the pyramid, the lever portion 41 is more stable than in the case of a conical shape. Further, the tip of the engaging portion 422 may be a curved surface in which the cross section passing through the central axis always has the same shape. Moreover, since stable rotation can be performed if the contact is made at least at three points, the support recess 411 is preferably a cone having a polygonal bottom surface that is equal to or greater than a triangle.
  • the lever support part 421 described in each of the above embodiments is integrated with the support leg part 42 or fixed to the support leg part 42, but the lever support part and the support leg part are formed separately. What is being considered is also possible.
  • the thing provided with the lever support part 461 which can be attached or detached may be used.
  • the support leg 46 includes a swing hole 460 into which the lever support 461 is rotatably inserted.
  • the lever support portion 461 has a swing shaft portion 462 inserted into the swing hole 460, and one end portion of the swing shaft portion 462 is orthogonal to the swing shaft portion 462. And an engaging shaft portion 463 that is engaged with a support recessed portion 413 formed in the lever portion 41. As shown in the figure, one end portion of the swing shaft portion 462 is connected to the central portion of the engagement shaft portion 463.
  • the lever support portion 461 is a member produced by integral molding. Since the swing shaft portion 462 of the lever support portion 461 is inserted into the swing hole 460, the lever support portion 461 can swing freely in the direction of the central axis, that is, the swing shaft Bx.
  • the support concave portion 413 is a concave groove having a concave curved inner wall surface whose cross-sectional shape is an arc of equal curvature.
  • the engagement shaft portion 463 is a member having a cylindrical shape, and has a size that can be engaged with the support recess 413.
  • the support recess 413 is engaged with the engagement shaft portion 463 and is engaged and supported by the engagement shaft portion 463, whereby the lever portion 41 rotates around the central axis of the engagement shaft portion 463, that is, the rotation axis Cx. Supported as possible. Since the balance of forces is the same as described above, detailed description thereof is omitted.
  • Assembling is performed by inserting the swing shaft portion 462 of the lever support portion 461 into the swing hole 460 of the support leg portion 46 and engaging the support recess portion 413 of the lever portion 41 with the engagement shaft portion 463 of the lever support portion 461.
  • the engagement shaft portion 463 is orthogonal to the swing shaft portion 462, and the swing shaft portion 462 is engaged with the support recess 413, so that the lever portion 41 can freely move around the swing shaft Bx. And can be rotated about the rotation axis Cx as described above.
  • the lever support portion 461 it is firmly supported by the support leg portion 46, and the lever portion 41 can be stably supported. Therefore, unstable operation such as vibration is difficult to occur during driving.
  • FIG. 14 is a view of still another example of the image pickup apparatus according to the present invention
  • FIG. 15 is a view in the middle of assembling the actuator of the lens driving device used in the image pickup apparatus shown in FIG. 14, and
  • FIG. It is a figure of the state which the lens drive device used with the imaging device shown lifted the lens unit.
  • symbol is attached
  • the arm portion 47 is formed to be inclined with respect to the lever portion 41.
  • a hinge portion 470 is formed in the middle portion of the arm portion 47.
  • the hinge portion 470 is formed thinner than the other portions of the arm portion 47.
  • the hinge portion 470 is elastically deformed by being formed thin in this way.
  • the lens driving device Lb is assembled as follows. First, the lever support portion 421 of the support leg 43 is inserted into the support recess 411 of the lever portion 41, the SMA actuator 44 is installed on the displacement input portion 412 of the lever portion 41, and the SMA actuator 44 is pulled to the displacement input portion 412. Apply tensile force. As a result, the arm portion 47 rotates about the rotation axis Cx, and the right displacement output portion 471R first contacts the convex portion 33 of the lens unit 3. Further, when the SMA actuator 44 is pulled and a tensile force is further applied to the displacement input portion 412, the hinge portion 470 formed on the right side of the arm portion 47 is deformed, and the left displacement output portion 471L is Abut.
  • both ends of the SMA actuator 44 are fixed to the electrode 45 (see FIG. 15).
  • the lens unit 3 has a bias force that the bias spring 6 presses the upper surface in the drawing downward, a drag force that is received from the edge portion 100 of the through hole 10 formed in the base portion 1, and a force that is received from a moment due to a tensile force. Are balanced.
  • the left and right displacement output parts 471L and 471R are driven. At this time, the left and right displacement output portions 471L and 471R apply a force equally to the convex portion 33, and the lens unit 3 is stably displaced (see FIG. 16).
  • the driving of the lens driving device La is the same as described above, and a detailed description thereof is omitted.
  • the tensile force of the SMA actuator 44 can be such that the left and right displacement output portions 471L and 471R are in contact with the convex portion 33 and the SMA actuator 44 does not sag. Furthermore, the tensile force of the SMA actuator 44 can be further increased, and the lens unit 3 can be set as the base position in a state where it floats from the edge portion 100 of the through hole 10 of the base portion 1.
  • the arm portion 47 is formed with the hinge portion 471 that is elastically deformed, even if the lever portion 41 and / or the arm portion 43 or the like is displaced due to an error during manufacturing or assembly, the displacement Thus, it is possible to suppress the occurrence of a problem that the lens unit 3 is inclined and displaced.
  • the lever support portion that is a convex portion is formed on the support leg portion and the support concave portion that is a concave portion is formed on the lever portion is described as an example.
  • the support recess may be formed in the support leg.
  • a SMA actuator using a linear shape memory alloy is described.
  • the SMA actuator is not limited to this, and the lever portion, such as a belt-like one, is stable and accurate. A shape that can be rotated and / or swung can be widely used.
  • the heating method of the SMA actuator includes one that generates Joule heat by energization, but it is not limited to this, and a method that can quickly switch between heating and cooling such as a method using induction heating is widely adopted. Is possible.
  • the SMA actuator not only one that uses a shape memory alloy that shrinks depending on temperature, but also one that can easily and quickly switch expansion and contraction, such as an alloy whose shape changes due to magnetism, can be widely used.
  • the lens holder moves in the optical axis direction of the lens, but is not limited thereto.
  • the present invention can be applied to a drive device that is required to be small and highly accurate, such as a lens drive device of a digital camera mounted on a mobile phone, a portable information terminal, or the like.
  • a Imaging device Ca Case Ims Image sensor 1 Base part 10 Through hole 2 Top plate part 20 Through hole 3 Lens unit 31 Imaging lens 32 Lens holding frame 33 Convex part 4 Actuator 41 Lever part 411 Support concave part 412 Displacement input part 42 Support leg part 421 Lever support portion 43 Arm portion 431 Displacement output portion 44 SMA actuator 45 Electrode 46 Support leg 460 Swing hole 461 Lever support portion 462 Swing shaft portion 463 Engagement shaft portion 47 Arm portion 51 Upper leaf spring 52 Lower leaf spring 6 Bias spring

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lens Barrels (AREA)

Abstract

La présente invention concerne un dispositif d'entraînement doté d'une section jambe de support (42), d'une section levier (41) supportée en rotation par la section jambe de support (42), et d'un actionneur en alliage à mémoire de forme (44) qui entraîne la section levier (41). Le dispositif d'entraînement est également doté d'une section de support de levier (421) qui dépasse soit de la section jambe de support (42), soit de la section levier (41), et est doté d'une section de mise en prise (422) sur le bord avant, et d'une section de support en retrait (411) qui est formée sur l'autre section parmi la jambe de support et la section levier, et qui est en prise avec la section de mise en prise (422).
PCT/JP2010/052827 2009-02-27 2010-02-24 Dispositif d'entraînement et dispositif d'entraînement de lentille WO2010098340A1 (fr)

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JP2011501612A JP5447501B2 (ja) 2009-02-27 2010-02-24 駆動装置及びレンズ駆動装置

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JP2009046575 2009-02-27
JP2009-046575 2009-02-27

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021505930A (ja) * 2017-11-22 2021-02-18 オプトチューン コンシューマー アーゲー オートフォーカス及び光学式手ぶれ補正機構を備える光学デバイス、特にカメラ
JP2021043319A (ja) * 2019-09-11 2021-03-18 新思考電機有限公司 レンズ駆動装置、カメラ装置及び電子機器
CN114721107A (zh) * 2022-05-16 2022-07-08 上海信迈电子科技有限公司 光学元件驱动装置、摄像装置及移动终端

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000343500A (ja) * 1999-05-31 2000-12-12 Minolta Co Ltd 揺動装置
JP2006146044A (ja) * 2004-11-24 2006-06-08 Konica Minolta Opto Inc 位置調整装置、位置調整方法及び光学ユニットの製造方法
JP2007058075A (ja) * 2005-08-26 2007-03-08 Konica Minolta Opto Inc 撮影レンズユニット
JP2009037059A (ja) * 2007-08-02 2009-02-19 Konica Minolta Opto Inc 駆動機構、駆動装置およびレンズ駆動装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000343500A (ja) * 1999-05-31 2000-12-12 Minolta Co Ltd 揺動装置
JP2006146044A (ja) * 2004-11-24 2006-06-08 Konica Minolta Opto Inc 位置調整装置、位置調整方法及び光学ユニットの製造方法
JP2007058075A (ja) * 2005-08-26 2007-03-08 Konica Minolta Opto Inc 撮影レンズユニット
JP2009037059A (ja) * 2007-08-02 2009-02-19 Konica Minolta Opto Inc 駆動機構、駆動装置およびレンズ駆動装置

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021505930A (ja) * 2017-11-22 2021-02-18 オプトチューン コンシューマー アーゲー オートフォーカス及び光学式手ぶれ補正機構を備える光学デバイス、特にカメラ
JP7123137B2 (ja) 2017-11-22 2022-08-22 オプトチューン コンシューマー アーゲー オートフォーカス及び光学式手ぶれ補正機構を備える光学デバイス、特にカメラ
JP2021043319A (ja) * 2019-09-11 2021-03-18 新思考電機有限公司 レンズ駆動装置、カメラ装置及び電子機器
JP7189852B2 (ja) 2019-09-11 2022-12-14 新思考電機有限公司 レンズ駆動装置、カメラ装置及び電子機器
CN114721107A (zh) * 2022-05-16 2022-07-08 上海信迈电子科技有限公司 光学元件驱动装置、摄像装置及移动终端

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JPWO2010098340A1 (ja) 2012-09-06

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