WO2014185297A1 - Drive device and imaging device - Google Patents

Drive device and imaging device Download PDF

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Publication number
WO2014185297A1
WO2014185297A1 PCT/JP2014/062170 JP2014062170W WO2014185297A1 WO 2014185297 A1 WO2014185297 A1 WO 2014185297A1 JP 2014062170 W JP2014062170 W JP 2014062170W WO 2014185297 A1 WO2014185297 A1 WO 2014185297A1
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WO
WIPO (PCT)
Prior art keywords
moving body
holding member
lens holding
lens
holder
Prior art date
Application number
PCT/JP2014/062170
Other languages
French (fr)
Japanese (ja)
Inventor
拓真 森川
豊年 川崎
松尾　隆
訓弘 阿川
Original Assignee
コニカミノルタ株式会社
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 コニカミノルタ株式会社 filed Critical コニカミノルタ株式会社
Publication of WO2014185297A1 publication Critical patent/WO2014185297A1/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
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
    • H02N2/021—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors using intermittent driving, e.g. step motors, piezoleg motors
    • H02N2/025—Inertial sliding motors

Definitions

  • the present invention relates to a driving device used in an imaging device that can be suitably mounted on, for example, a mobile phone, and an imaging device using the driving device.
  • SIDM Smooth Impact Drive Mechanism
  • This drive device includes a piezoelectric element that is an electromechanical conversion element, a drive shaft as a drive member joined to one end of the piezoelectric element, and a moving body that is frictionally engaged with the drive shaft on the outer periphery of the drive shaft. And.
  • the drive device transmits the expansion and contraction of the piezoelectric element to the drive shaft, and drives the moving body pressed against the drive shaft using the speed difference between the expansion and contraction of the piezoelectric element.
  • the moving body frictionally engaged with the drive shaft is also driven and moved, while the frictionally engaged friction force is generated.
  • the drive shaft is instantaneously reduced to the extent that it exceeds, the moving body is left in the extended position.
  • Patent Document 1 discloses a SIDM driving device.
  • a moving body is formed in a rectangular shape, and a lens is held by the rectangular moving body.
  • the moving body is pressed against the outer periphery of the drive shaft via the clamping member by the pressing force of the compression coil spring as the pressing member.
  • Patent Document 1 since the moving body is formed in a rectangular shape, it is difficult to reduce the overall size and the lens diameter.
  • the movable body 100a formed in a cylindrical shape is disposed so as to be movable along the guide shaft 103, and is driven by a pressing force of a coil spring 101 as a pressing member.
  • the member 102 is pressed against the outer periphery of the moving body 100a.
  • FIG. 19B for example, if the radial thickness of the cylindrical moving body 100b is reduced, the overall size can be further reduced and the lens diameter can be increased.
  • the moving body 100b shown in FIG. 19B is thinner in the radial direction than the moving body 100a shown in FIG. 19A, it is easily deformed by the pressing force W of the coil spring 101 as shown in FIG. 19C. When such deformation occurs, it becomes difficult to mount the lens on the inner peripheral side.
  • a lens is mounted on the inner peripheral side before the moving body 100b is deformed. In this case, the lens assembled to the moving body 100b receives the pressing force of the spring 101 via the moving body 100b. May cause distortion.
  • the present invention has been made in view of the above-described circumstances, and its object is to easily attach the lens to the moving body even when the moving body is deformed by the pressing force of the pressing member, and to the lens. It is an object of the present invention to provide a driving device and an imaging device that are less likely to be pressed.
  • the lens holding member that holds the lens is between the outer periphery and the inner periphery of the moving body pressed against the driving member to which the mechanical energy of the electromechanical transducer is transmitted.
  • the movable body is disposed on the inner peripheral side so that a gap is formed.
  • FIG. 1 It is a perspective view of the drive device of a 1st embodiment. It is a disassembled perspective view of the drive device shown in FIG. It is a perspective view of the actuator main body used for the drive device shown in FIG. It is a perspective view of the holder used for the drive device shown in FIG. It is a perspective view of the movable body main-body part used for the drive device shown in FIG. It is a top view of the mobile body main-body part shown in FIG. It is a perspective view of the circular-arc-shaped board used for the drive device shown in FIG. It is a top view of the circular arc-shaped board shown in FIG. It is a top view in the state where the cover of the drive unit shown in FIG. 1 was removed.
  • connection part of an electrode terminal and a piezoelectric element It is a perspective view of the connection state of the said mobile body main-body part and the said circular arc shaped board. It is explanatory drawing at the time of connecting the said mobile body main part and the said circular arc-shaped board body using a jig
  • FIG. A is an explanatory diagram of a state in which the lens holding member is housed in the lens holding member housing portion of the moving body before the lens holding member is pressed by the pressing piece
  • FIG. B is a state in which the lens holding member is pressed by the pressing piece.
  • FIGS. A to D are explanatory views of a method of adjusting the positioning with respect to the imaging element reference plane when the lens holding member is housed in the lens holding member housing portion.
  • FIG. A is an explanatory diagram of a driving device in a state in which the lens holding member is positioned and adjusted with respect to the imaging element reference plane and is stored in the lens holding member storage portion, and
  • FIG. It is explanatory drawing of the comparative example of the state accommodated by the positioning adjustment on the lower surface of a member accommodating part. It is sectional drawing of the imaging device which has the drive device of 1st Embodiment.
  • FIG. A is a schematic plan view of a driving apparatus according to the second embodiment
  • FIG. B is a side view of a part of FIG. 18A in cross section.
  • FIG. A is an explanatory diagram of a conventional example having a cylindrical moving body
  • FIG. B is an explanatory diagram of another conventional example having a moving body with a reduced radial thickness.
  • FIG. C is an explanatory diagram of a state in which the moving body shown in FIG. 19B is deformed by the pressing force of the pressing member.
  • FIG. 1 is a perspective view of the drive device according to the first embodiment
  • FIG. 2 is an exploded perspective view of the drive device shown in FIG.
  • the X direction in FIGS. 1 to 3, 5, 7, 10, 10 to 13, and 15 to 18 is the upper side (object side)
  • the Y direction is the lower side (image side). Will be described.
  • the drive device 1 of the present embodiment is used for an imaging device that can be mounted on, for example, a mobile phone.
  • the drive device 1 of this embodiment includes a holder 2, an actuator body 3 held by the holder 2, a moving body 4 held by the actuator body 3, and a moving body 4.
  • a pressing piece (pressing member) 63 that presses the actuator body 3 with each other, a lens holding member 9, and a cover 8 are provided.
  • the holder 2 is made of a resin material such as LCP (liquid crystal polymer), and is formed by injection molding in which part of electrode terminals 22 and 23 described later are inserted.
  • the holder 2 of this embodiment is a cylindrical body having a rectangular outer periphery and a circular through hole 20g serving as an optical path at the center.
  • the holder 2 includes a first support column 20a at the first corner 2a on the left front side.
  • the holder 2 includes an actuator fixing portion 21 that holds the actuator body 3 inside the first support pillar 20a in the first corner portion 2a.
  • the actuator fixing portion 21 is formed so as to be recessed in a cylindrical shape with a predetermined depth from the upper surface 2e of the holder 2, and the upper side is opened.
  • the holder 2 has a tip 22a of the first electrode terminal 22 and a tip 23a of the second electrode terminal 23 protruding above the holder 2 on both sides of the actuator fixing portion 21 in the first corner 2a. It is arranged.
  • Each of the first electrode terminal 22 and the second electrode terminal 23 has an intermediate portion embedded in the holder 2 and a proximal end projecting from the outer surface of the holder 2 to form external connection terminals 22b and 23b. Yes. And the circuit board and connector of the mobile phone which are not shown in which this drive device 1 is mounted, and these external connection terminals 22b and 23b are connected.
  • the external connection terminals 22b of the first electrode terminals 22 and the external connection terminals 23b of the second electrode terminals 23 are flush with the lower surfaces of the external connection terminals 22b and 22b, respectively. It is bent and formed through the step portion. Thereby, each of the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b of the second electrode terminal 23 can be connected to the circuit board so as to be energized by being placed on the circuit board of the mobile phone, for example. ing.
  • the holder 2 has a second support column 20b, a third support column 20c, and a fourth support column at the second corner portion 2b, the third corner portion 2c, and the fourth corner portion 2d, respectively. 20d.
  • the third support pillar 20c is formed with a restricting portion receiving groove 29 for receiving a rotation restricting portion 61a of the moving body 4 described later so as to be movable in the vertical direction.
  • the holder 2 includes an image sensor attachment reference surface 19a on the lower surface when the image sensor is attached.
  • substantially the entire lower surface of the holder 2 forms the image sensor attachment reference surface 19a, and the sensor substrate 504 having the image sensor 503 is attached to the image sensor attachment reference surface 19a as shown in FIG.
  • the optical surface of the image sensor 503 is arranged in parallel with the image sensor attachment reference surface 19a.
  • the actuator body 3 is joined to a piezoelectric element 31 that is an electromechanical conversion element that expands and contracts in the axial direction, a drive shaft 32 joined to one end of the piezoelectric element 31, and the other end of the piezoelectric element 31.
  • the weight 33 is provided.
  • the weight 33 is for efficiently generating displacement due to expansion and contraction of the piezoelectric element 31 on the drive shaft 32 side.
  • the weight 33 is made of a material having a high specific gravity such as tungsten or a tungsten alloy.
  • the weight 33 is a cylindrical shape formed so that the outer diameter protrudes from the outer periphery of the piezoelectric element 31 to the outer periphery over the entire periphery.
  • the weight 33 may be omitted when the other end of the piezoelectric element 31 can be attached to the holder 2 and the same function as the weight 33 can be exhibited.
  • the piezoelectric element 31 is an element that converts input electric energy into mechanical energy that expands and contracts, that is, mechanical motion.
  • a piezoelectric element that converts input electric energy into mechanical elastic motion by a piezoelectric effect, or the like It is.
  • Such a piezoelectric element includes, for example, a laminated body and a pair of external electrodes.
  • the laminate is formed by alternately laminating a plurality of thin film (layered) piezoelectric layers made of a piezoelectric material and a conductive thin film (layered) internal electrode layer.
  • the laminate has a quadrangular prism shape, but is not limited to this, and may be, for example, a polygonal column shape or a cylindrical shape.
  • the plurality of internal electrode layers are each configured such that a part thereof faces the outside with a pair of outer peripheral side surfaces facing each other.
  • the pair of external electrodes are formed along the stacking direction on the pair of outer peripheral side surfaces in the stacked body, and supply the electric energy to the stacked body, and are sequentially and alternately connected to the plurality of internal electrodes. .
  • piezoelectric material examples include lead zirconate titanate (so-called PZT), crystal, lithium niobate (LiNbO 3 ), potassium tantalate niobate (K (Ta, Nb) O 3 ), barium titanate (BaTiO 3 ), Inorganic piezoelectric materials such as lithium tantalate (LiTaO 3 ) and strontium titanate (SrTiO 3 ).
  • PZT lead zirconate titanate
  • crystal lithium niobate
  • LiNbO 3 lithium niobate
  • BaTiO 3 barium titanate
  • Inorganic piezoelectric materials such as lithium tantalate (LiTaO 3 ) and strontium titanate (SrTiO 3 ).
  • the piezoelectric element 31 is formed by sputtering silver or the like on two side surfaces opposed to each other by external electrodes 31a that connect electrodes between layers in parallel.
  • the lower end surface of the piezoelectric element 31 is bonded to the upper end surface of the weight 33 with a bonding adhesive such as an epoxy adhesive.
  • a bonding adhesive such as an epoxy adhesive.
  • a bonding adhesive is used in which resinous beads having a diameter of about 5 ⁇ m are mixed in an epoxy adhesive in order to prevent a short circuit with the weight and stabilize the thickness of the adhesive layer.
  • the drive shaft 32 is made of CFRP (carbon fiber reinforced plastic) molded in a cylindrical shape with resin so that carbon fibers are arranged in the axial direction.
  • the drive shaft 32 of this embodiment is formed so that the outer diameter protrudes from the outer periphery of the piezoelectric element 31 to the outer periphery over the entire periphery.
  • the lower end surface of the drive shaft 32 is bonded to the upper end surface of the piezoelectric element 31 with a bonding adhesive.
  • This bonding adhesive is the same as the bonding adhesive obtained by bonding the piezoelectric element 31 and the weight 33.
  • a bonding adhesive that protrudes from the bonding surface between the drive shaft 32 and the piezoelectric element 31 is formed on the piezoelectric element side, so that the entire region of the drive shaft 32 is connected to the moving body 4. And a large stroke can be realized with the short drive shaft 32.
  • the actuator main body 3 configured in this way is arranged so that the weight 33 side (one end side) faces down and is fitted and inserted into the actuator fixing portion 21 of the holder 2 from above, and is fixed to the holder.
  • the actuator fixing portion 21 and the weight 33 are bonded and fixed by the adhesive for use.
  • the actuator body 3 held by the actuator fixing portion 21 of the holder 2 includes the first electrode and the external electrode 31a of the piezoelectric element 31 via the two first electrode connection springs 24a and the second electrode connection spring 24b.
  • Each of the tip 22a of the terminal 22 and the tip 23a of the second electrode terminal 23 is connected to be energized.
  • the first electrode connection spring 24a and the second electrode connection spring 24b have the same configuration, and each of them is plated with gold or platinum, and the coil portion. 25a and a torsion coil spring provided with a first foot portion 25b and a second foot portion 25c projecting radially outward from the coil portion 25a.
  • the first electrode connecting spring 24a is configured such that the tip 22a of the first electrode terminal 22 is pushed into the coil portion 25a, the first foot portion 25b is in contact with one external electrode 31a of the piezoelectric element 31, and the second The foot portion 25 c is locked to a spring locking portion 26 (shown in FIG. 9) provided on the holder 2. In this state, a torsional force is accumulated in the coil portion 25a, and the first foot 25b presses the external electrode 31a of the piezoelectric element 31 by the torsional force.
  • the second electrode connecting spring 24b is such that the tip 23a of the second electrode terminal 23 is pushed into the coil portion 25a, the first foot 25b abuts against the other external electrode 31a of the piezoelectric element 31, and the second foot 25c is locked to a spring locking portion 26 (see FIG. 9) of the holder 2.
  • a torsional force is accumulated in the coil portion 25a, and the first leg 25b presses the external electrode 31a of the piezoelectric element 31 by the torsional force.
  • the conductive adhesive 27 is applied from the contact portion between the first leg portion 25b of each of the first electrode connection spring 24a and the second electrode connection spring 24b and the external electrode 31a of the piezoelectric element 31 to the coil portion 25a. It arrange
  • the surface of the conductive adhesive 27 is covered with the reinforcing adhesive 28, and the adhesive strength of the conductive adhesive 27 is reinforced.
  • the moving body 4 is engaged with the drive shaft 32 with a predetermined frictional force, and slides along the axial direction of the drive shaft 32.
  • the moving body 4 of this embodiment includes a metal cylindrical moving body main body 5, and an arcuate plate (metal plate) 6 that is separate from the moving body main body 5. It has.
  • the movable body main body 5 is made of stainless steel and has a thickness of 0.05 mm to 0.3 mm and is formed by drawing.
  • Stainless steel is a material that is inexpensive, has good moldability, good durability, and good driving performance among metal materials.
  • the movable body main body 5 includes a lens holding member storage portion 54 on the inner peripheral side, and the lens holding member 9 is stored and fixedly held in the lens holding member storage portion 54. Is done.
  • the movable body main body 5 includes a first sliding surface 51 that slides on the drive shaft on a part of the outer peripheral surface.
  • the first sliding surface 51 is formed in a flat plate shape with a predetermined width in the circumferential direction over the entire axial direction when molding the movable body main body 5. Is formed in a plane. For this reason, when the movable body main body slides on the drive shaft, the movable body main body can slide while maintaining a constant posture without being inclined with respect to the drive shaft.
  • the movable body main body 5 of this embodiment includes a first flange 52 formed at the lower end so as to protrude radially inward, and a first end formed at the upper end so as to protrude radially outward. Two flanges 53 are provided, and these increase the strength of the movable body main body 5.
  • the movable body main body 5 is a metal tube, it has high durability and durability against wear, and since it is a thin metal tube, it is possible to increase the diameter of the lens 71 held inside. Become. Further, since the drive shaft 32 is driven in direct contact with the moving body main body 5, the inside of the moving body main body 5 is compared with a configuration in which a portion that frictionally engages the actuator main body 3 is provided separately from the portion that holds the lens 71. It is possible to increase the diameter of the lens 71 held by the lens.
  • the arcuate plate 6 is made of stainless steel and has a thickness of 0.1 mm to 0.2 mm. As shown in FIGS. 7 and 8, the arcuate plate 6 includes an arc portion 61 and a guide portion 62 formed on one end side of the arc portion 61.
  • the arc portion 61 includes a rotation restricting portion 61a at a position separated from the guide portion 62 by a substantially half circumference (180 ° in the central angle) in the circumferential direction.
  • the rotation restricting portion 61a is for restricting rotation of the movable body 4 around the axis of the drive shaft 32, and includes a restricting frame portion 61b and a hemispherical protrusion 61c formed on the restricting frame portion 61b. ing.
  • the restriction frame portion 61b is formed so that a part of the arc portion 61 protrudes radially outward in a rectangular shape.
  • the protrusion 61c is formed so as to protrude outward from both outer side surfaces of the restriction frame portion 61b. Further, the outer width W1 (shown in FIG. 9) between the protrusions 61c is set to be slightly narrower than the inner width W2 (shown in FIG. 9) of the restricting portion receiving groove 29 of the holder 2. In FIG. 9, the outer width W ⁇ b> 1 between the protrusions 61 c and the inner width W ⁇ b> 2 of the restricting portion receiving groove 29 are the same.
  • the circular arc part 61 is provided with a narrow part 61d having a narrower width than the other part between one end (guide part 62) and the rotation restricting part 61a.
  • the guide portion 62 is formed by bending a part of one end side of the arc portion 61 outward in the radial direction of the arc portion 61, and a second sliding surface that slides the drive shaft 32 on one surface thereof. 62a is provided.
  • the pressing piece 63 of this embodiment is integrally formed with the arc-shaped plate 6 so as to extend linearly from the other end of the arc portion 61 through the stepped portion, A pressing portion 63 a that presses the drive shaft 32 is provided.
  • the pressing portion 63a of this embodiment is formed narrower than the first sliding surface 51 and the second sliding surface 62a.
  • the arcuate plate body 6 on which the pressing piece 63 is integrally formed and the movable body main body 5 are fixedly connected by welding.
  • the first sliding surface 51 of the moving body main body 5 and the second sliding surface 62 a of the arcuate plate 6 are adjacent to each other. It arrange
  • both are fixed by performing welding, such as resistance welding (spot welding) and laser welding, at a plurality of locations (in this embodiment, four locations indicated by x in FIG. 7).
  • welding such as resistance welding (spot welding) and laser welding
  • the pressing piece 63 is connected to the outer periphery of the moving body main body 5 of the moving body 4 by the connecting portion 55.
  • the movable body main body is used by using the positioning jig 11 that holds the rotation restricting portion 61a and the second sliding surface posture adjusting jig 12 that holds the guide portion 62.
  • Welding is performed after determining the position of the part 5 and the arcuate plate 6 and the attitude of the second sliding surface.
  • the posture of the second sliding surface is easily set by the narrow portion 61 d of the arc portion 61.
  • the first sliding surface 51 and the second sliding surface 62a are substantially perpendicular, and both are L-shaped.
  • the movable body main body 5 and the arcuate plate body 6 are made of a metal such as stainless steel, and can be fixed firmly by welding, and can be fixed instantaneously unlike bonding. Tact time can be greatly reduced.
  • the movable body main body 5 and the arcuate plate 6 are connected, the movable body is pressed against the drive shaft 32 of the actuator body 3 so as to be axially movable and frictionally engaged as follows.
  • the rotation restricting portion 61 a is placed in the restricting portion receiving groove 29 of the holder 2, and the drive shaft 32 of the actuator body 3 held by the holder 2 is connected to the first sliding surface 51 and the second sliding portion. It arrange
  • the first sliding surface 51 is pressed against the outer periphery of the drive shaft 32 by the pressing force of the pressing piece 63, and the moving body 4 is held by the drive shaft 32 of the actuator body 3 so as to be movable in the axial direction. .
  • the pressing piece 63 is in a state extending from the second corner 2b of the holder 2 to the first corner 2a.
  • the first sliding surface 51 is perpendicular to a line P connecting the center O1 of the holder 2 and the axis O2 of the driving shaft 32 when viewed from the upper side in the axial direction of the driving shaft 32, and the second sliding surface 62a is , Parallel to the line P.
  • the lens holding member 9 holds a lens 71 (shown in FIG. 17).
  • the lens holding member 9 is made of a synthetic resin such as liquid crystal polymer (LCP) and is formed in a cylindrical shape by injection molding.
  • LCP liquid crystal polymer
  • the lens holding member 9 includes a lens support portion 91 on the inner peripheral side, and one or a plurality of lenses 71 are supported on the lens support portion 91.
  • the lens support portion 91 of this embodiment is composed of a female screw portion formed on the inner periphery of the lens holding member 9.
  • the lens holding member 9 is formed to have a gap 92 between the outer periphery thereof and the lens holding member storage portion 54 of the movable body main body 5.
  • a gap 92 is formed over the entire circumference so that only the movable body main body 5 can be deformed by the pressing force of the pressing portion 63a. It is like that.
  • the outer diameter R1 of the lens holding member 9 is in the lens holding member storage portion 54 of the movable body main body 5 in a state after being deformed by the pressing force W of the pressing piece 63 as shown in FIG. 14B. It is set to the same level as the minimum diameter R2. More specifically, in this embodiment, when the first sliding surface 51 is pressed against the drive shaft 32 by the pressing force of the pressing piece 63, the moving body main body 5 causes the connecting portion 55 with the pressing piece 63 to react with the reaction force. It transforms into a part.
  • the outer diameter R1 of the lens holding member 9 is set to be approximately the same as the minimum diameter R2 of the lens holding member storage portion 54 of the deformed movable body main body 5.
  • the lens holding member 9 configured as described above has the lens in the movable body main body 5 in the state shown in FIG. 14B in which the first sliding surface 51 is deformed by being pressed against the outer periphery of the drive shaft 32 by the pressing force of the pressing piece 63. It is inserted into the holding member storage portion 54.
  • the lens holding member 9 is the lens holding member. It is easily inserted into the storage portion 54.
  • the lens holding member 9 when the lens holding member 9 is stored in the lens holding member storage portion 54 of the movable body main body 5, the lens holding member 9 is aligned and adjusted to a preset image sensor reference surface 200. Is done.
  • a method for adjusting the alignment for example, the following method can be cited.
  • the image sensor reference plane 200 is set in advance to a plane parallel to an image sensor 503 (shown in FIG. 17) described later, and the holder 2 is placed on the image sensor reference plane 200. ing. Then, the collimator 201 adjusts the axis O1 of the lens support portion 91 of the lens holding member 9 to be perpendicular to the image sensor reference plane 200.
  • the image sensor reference plane 200 is set in advance to a plane parallel to the image sensor 503, and the holder 2 placed on the image sensor reference plane 200 is placed on the image sensor reference plane 200.
  • a parallel holder reference surface 221 is provided.
  • the lens holding member 9 includes a holding member reference surface 291 orthogonal to the axial direction (optical axis direction) at the lower end (one end).
  • the holding member reference surface 291 is pressed against the holder reference surface 221, whereby the lens support member 9 supports the lens.
  • Positioning is performed such that the axis O1 of the portion 91 is perpendicular to the image sensor reference plane 200.
  • the image sensor reference surface 200 is a surface parallel to the image sensor 503 and formed so as to enter the inside of the holder 2.
  • the lens holding member 9 includes a holding member reference surface 291 orthogonal to the axial direction at the lower end. When the lens holding member 9 is stored in the lens holding member storage portion 54 of the moving body 4, the holding member reference surface 291 is pressed against the image sensor reference surface 200.
  • an image sensor reference parallel surface 200 a formed in a plane parallel to the image sensor reference surface 200 is arranged on the upper side of the holder 2.
  • the lens holding member 9 includes a holding member reference surface 292 orthogonal to the axial direction at the upper end (the other end).
  • the holding member reference surface 292 is pressed against the imaging element reference parallel surface 200a.
  • the lens holding member 9 is positioned and accommodated with respect to the image sensor reference plane 200, so that the moving body 4 frictionally engaged with the drive shaft 32 is independent of the inclination with respect to the image sensor reference plane 200.
  • the axis O1 of the lens holding member 9 can be moved along a vertical line perpendicular to the image sensor reference plane 200.
  • the axis O1 of the lens barrel 407 is the image sensor reference plane. If the lens barrel 407 and the image sensor reference surface 200 are aligned with respect to a vertical line perpendicular to the line 200, the axis O2 of the drive shaft 432 that is frictionally engaged with the moving body 404 is usually set to the image sensor reference surface. By tilting with respect to a vertical line perpendicular to 200, adjustment is made so that the axis O1 of the lens barrel 407 and the vertical line perpendicular to the image sensor reference plane 200 coincide.
  • the lens barrel 407 makes a predetermined angle with respect to the vertical line. It will move in the direction.
  • the axis O3 of the moving body 4 frictionally engaged with the drive shaft 32 forms a predetermined angle with respect to a vertical line perpendicular to the image sensor reference plane 200. Even when tilted, the axis O1 of the lens holding member 9 coincides with the vertical line. Therefore, when the moving body 4 moves along the axial direction of the drive shaft 32, the moving body 4 moves with a predetermined angle with respect to the vertical line, but the lens holding member 9 moves in the same direction as the vertical line. Moving.
  • the adhesive 93 for the lens holding member is not particularly limited, and for example, a thermosetting adhesive can be used.
  • the cover 8 of this embodiment is formed by drawing and pressing a stainless steel thin plate of 0.1 mm to 0.2 mm, and has a through hole 82 serving as an optical path in the upper wall 81.
  • the cover 8 is provided with a locking hole 84 for locking to a locking projection 20f provided on the side surface of the holder 2 on each of the four side walls 83.
  • the number of the locking projections 20f is two, and the locking projections 20f are locked with the two locking holes 84 facing each other.
  • the cover 8 is formed on the mounting table 20e provided on the upper surfaces of the first support column 20a, the third support column 20c, and the fourth support column 20d of the holder 2, and on the upper surface of the second support column 20b.
  • the locking hole 84 and the locking projection 20f are locked in a state where the inner surface of the upper wall 81 is in contact.
  • the lens barrel (imaging optical system) 7 is held on the lens support portion 91 of the lens holding member 9, and the lower surface side of the holder 2 is
  • An image pickup apparatus 500 is formed by attaching a sensor substrate 504 having an IR cut filter 502 and an image pickup element 503.
  • the image sensor 503 is an image of each component of R (red), G (green), and B (blue) in accordance with the amount of light in an optical image of an object (subject) formed by an imaging optical system (not shown) as a whole. It is an element that photoelectrically converts a signal and outputs it to a predetermined image processing circuit (not shown).
  • the image sensor 503 is, for example, a CCD image sensor, a CMOS image sensor, or the like.
  • the imaging optical system includes one or a plurality of lens groups (optical elements) 71, and forms an optical image of an object on the light receiving surface of the imaging element 503.
  • the lens group 71 is an optical element that moves along the optical axis among the one or more optical elements in such an imaging optical system.
  • the lens group 71 may be a single lens or may include a plurality of lenses.
  • the lens group 71 may be, for example, a lens that moves along the optical axis to perform focusing (focusing), or a lens that moves along the optical axis to perform zooming (magnification), for example. It may be.
  • the optical image of the object is guided by the imaging optical system including the lens group 71 along the optical axis to the light receiving surface of the imaging element 503, and the optical image of the object is captured by the imaging element 503.
  • the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b (see FIG. 1 and the like) of the second electrode terminal 23 are placed on the circuit board of the mobile phone in the casing of the mobile phone. Is done.
  • the piezoelectric element 31 of the actuator body 3 vibrates in the axial direction and the vibration occurs.
  • the reciprocating movement of the drive shaft 32 causes the moving body 4 to move in the axial direction of the drive shaft 32 (optical axis direction).
  • the displacement of the piezoelectric element 31 becomes a triangular wave, and the amplitude ratio is increased and decreased by changing the duty ratio of the rectangular wave. Triangular waves with different slopes are generated.
  • the drive mechanism of the actuator body 3 utilizes this.
  • the moving body 4 that is frictionally engaged with the drive shaft 32 is also moved in response to the vibration, and the drive is instantaneously performed to exceed the frictionally engaged friction force.
  • the moving body 4 is left as it is. By repeatedly performing such vibration in the axial direction of the drive shaft 32, the moving body 4 moves in the axial direction of the drive shaft 32.
  • the driving device 300 of the second embodiment includes a holder 302, an actuator body 303, a moving body 304, a coil spring (pressing member) 306, and a lens holding member 309.
  • the holder 302 has a rectangular shape in a plan view, and includes a guide shaft 321 for guiding the moving body 304 at the second corner portion 302b and the fourth corner portion 302d.
  • the actuator body 303 includes a piezoelectric element 331 that is an electromechanical conversion element, and a driving protrusion 332 that is bonded to one surface 331a of the piezoelectric element 331 and that transmits mechanical energy from the piezoelectric element 331. .
  • the piezoelectric element 331 of the second embodiment includes a first vibrating portion and a second vibrating portion that are formed at regular intervals, and the first vibrating portion and the second vibrating portion are provided. Depending on the portion, the one surface 331a is elliptically moved when a voltage is applied to the piezoelectric element 331.
  • the drive protrusion 332 is composed of two hemispherical shapes.
  • the actuator body 303 configured as described above is arranged at the first corner portion 302a of the holder 302 so that the drive protrusion 332 faces inward.
  • the moving body 304 is formed in a cylindrical shape from a metal plate-like body, and includes two guide shaft insertion holes 351 disposed at equal intervals in the circumferential direction on the outer peripheral portion.
  • the guide shaft 321 is movably inserted through these guide shaft insertion holes 351. In this state, the outer peripheral surface of the moving body 304 and the drive protrusion 332 are opposed to each other in the radial direction.
  • the coil spring 306 is disposed between the other surface 331 b of the piezoelectric element 331 and the inner surface of the first corner portion 302 a of the holder 302, and presses the drive protrusion 332 against the outer peripheral surface of the moving body 304 via the piezoelectric element 331. is doing.
  • the lens holding member 309 includes a lens support portion 391 including a female screw portion on the inner peripheral side, and a lens barrel that holds one or a plurality of lenses is supported on the lens support portion 391.
  • the lens holding member 309 has an outer diameter of the inner periphery of the moving body 304 in a state where the outer peripheral surface is deformed by being pressed radially inward by the pressing force of the coil spring 306 via the piezoelectric element 331 and the driving protrusion 332. It is formed approximately the same as the minimum diameter.
  • the lens holding member 309 is deformed by the outer peripheral surface being pressed radially inward by the pressing force of the coil spring 306 via the piezoelectric element 331 and the driving protrusion 332. It is inserted on the inner peripheral side of the moving body 304 in the state.
  • the moving body 304 when the outer peripheral surface is pressed radially inward via the driving protrusion 332 by the pressing force of the coil spring 306, the moving body 304 abuts on the guide shaft 321 and applies the contact.
  • the contact part is transformed into a reaction force part.
  • the lens holding member 309 is inserted into the inner periphery of the movable body 304 after the deformation.
  • the lens holding member 309 is easily inserted into the inner peripheral side of the moving body 304.
  • a lens holding member adhesive 393 is filled and fixed in a gap 392 formed between the outer peripheral surface of the lens holding member 309 and the inner peripheral surface of the moving body 304.
  • the driving apparatus 300 when a voltage is applied to the piezoelectric element 331, the one surface 331a of the piezoelectric element 331 performs an elliptical motion, and the driving protrusion 332 is pressed accordingly.
  • the moving body 304 that has come into contact with the predetermined frictional force moves along the guide shaft 321, and the lens holding member 309 held by the moving body 304 moves in the same direction together with the moving body 304.
  • the lens holding member is inserted on the inner peripheral side of the moving body in a state after being pressed and deformed by the pressing force of the pressing member.
  • the lens holding member is inserted on the inner peripheral side of the moving body before being pressed and deformed, and after the lens holding member is inserted, the moving body is pressed by the pressing force of the pressing member, and then the lens is held.
  • the member and the moving body may be bonded.
  • the lens holding member is provided with a lens support portion including an internal thread portion on the inner peripheral side.
  • the lens holding member is not limited to this configuration.
  • the lens holding member is on the inner peripheral side.
  • the lens barrel may be held via an adhesive.
  • the lens holding member hold maintained the 1 or several lens via the lens barrel
  • a male screw is formed in the outer periphery of a 1 or several lens
  • One or a plurality of lenses may be directly held, or one or a plurality of lenses may be directly fixed to the lens holding member, and can be changed as appropriate.
  • a driving apparatus includes a holder, an electromechanical conversion element that is held by the holder and converts electrical energy into mechanical energy, and a driving member that is joined to the electromechanical conversion element and to which the mechanical energy is transmitted.
  • a moving body that moves relative to the holder, a pressing member that presses a driving member against the moving body, and a lens holding member that holds a lens.
  • the lens holding member includes an outer periphery thereof and an inner portion of the moving body. It arrange
  • the lens holding member is disposed on the inner peripheral side of the moving body so that a gap can be formed between the outer periphery of the lens holding member and the inner periphery of the moving body. For this reason, such a driving device can easily attach the lens holding member to the inner peripheral side of the moving body after the moving body is pressed and deformed by the pressing member, for example. Moreover, the lens holding member after mounting is less likely to receive a pressing force by the pressing member.
  • the moving body has a cylindrical shape
  • the driving body is pressed against the outer periphery of the moving body
  • the lens holding member is pressed against the pressing member. It is formed so that it can be inserted in the inner peripheral side of the said mobile body of the state made.
  • the lens holding member is formed so as to be insertable on the inner peripheral side of the moving body pressed by the pressing member. For this reason, in such a drive device, the lens holding member can be easily disposed on the inner peripheral side of the moving body even if the moving body is pressed by the pressing member and deformed. In addition, it is possible to reduce the possibility that the pressing force by the pressing member is applied to the lens holding member after the arrangement.
  • the moving body is formed of a metal plate-like body.
  • the movable body is formed to have a large inner circumference with the same outer diameter, and a large-diameter lens holding member can be efficiently mounted on the inner circumference side.
  • the moving body is easily deformed, but even if the moving body is deformed, the lens holding member is hardly affected. Therefore, the moving body is suitable as the moving body used in the present invention.
  • the driving member is a shaft-like body, one end in the axial direction of the driving member is joined to the electromechanical transducer, and the moving body is the driving device.
  • the member is frictionally engaged so as to be axially movable.
  • the moving body can move along the axial direction of the drive member. For this reason, such a drive device can eliminate the need for a guide shaft or the like for guiding the moving body. Therefore, the drive device has a simple configuration, and the overall size can be reduced.
  • An imaging apparatus includes any one of the above-described driving apparatuses, an imaging element that converts an optical image into an electrical signal, and one or a plurality of optical elements, and captures an optical image of an object.
  • An imaging optical system that forms an image on a light receiving surface of the element, and the optical element that moves in the optical axis direction among the one or more optical elements in the imaging optical system is the lens holding unit of the driving device. It is held by the member.
  • the lens holding member can be easily mounted on the inner peripheral side of the moving body. Moreover, the lens holding member after mounting is less likely to receive a pressing force by the pressing member.
  • a driving device and an imaging device can be provided.

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Abstract

In this drive device and imaging device, a lens holding member for holding a lens is arranged on the inner peripheral side of a moving body pressed against a drive member to which mechanical energy of an electro-mechanical conversion element is transmitted, said lens holding member being arranged between the outer periphery of the lens and the inner periphery of the moving body so as to form a gap. This drive device and imaging device can easily mount a lens in the moving body even when the moving body is deformed in response to a pressing force, and moreover, there is little risk that the pressing force will act on the lens.

Description

駆動装置および撮像装置Driving device and imaging device
　本発明は、例えば携帯電話などに好適に搭載可能な撮像装置に用いられる駆動装置およびこれを用いた撮像装置に関する。 The present invention relates to a driving device used in an imaging device that can be suitably mounted on, for example, a mobile phone, and an imaging device using the driving device.
　従来から、携帯電話などに搭載可能な撮像装置に用いられる駆動装置として、例えばＳＩＤＭ（Ｓｍｏｏｔｈ　Ｉｍｐａｃｔ　Ｄｒｉｖｅ　Ｍｅｃｈａｎｉｓｍ、「ＳＩＤＭ」は登録商標）と称される駆動装置が知られている。この駆動装置は、電気機械変換素子である圧電素子と、前記圧電素子の一端側に接合された駆動部材としての駆動軸と、前記駆動軸の外周に、駆動軸に摩擦係合された移動体とを備えている。そして、この駆動装置は、前記圧電素子の伸縮を駆動軸に伝え、その駆動軸に押しつけられた移動体を、前記圧電素子の伸張時と縮小時との速度差を利用して駆動させる。より詳しくは、このような駆動装置では、例えば駆動軸をゆっくりと伸張させることによって、その駆動軸に摩擦係合された移動体も駆動して移動する一方、前記摩擦係合された摩擦力を超える程、駆動軸を瞬時に縮小させると、前記移動体が伸張位置に取り残される。このような駆動軸の伸長と収縮とを繰返し行うことで、駆動装置は、前記移動体を前記駆動軸の軸方向に駆動させることができる。 2. Description of the Related Art Conventionally, as a driving device used for an imaging device that can be mounted on a mobile phone or the like, for example, a driving device called SIDM (Smooth Impact Drive Mechanism, “SIDM” is a registered trademark) is known. This drive device includes a piezoelectric element that is an electromechanical conversion element, a drive shaft as a drive member joined to one end of the piezoelectric element, and a moving body that is frictionally engaged with the drive shaft on the outer periphery of the drive shaft. And. The drive device transmits the expansion and contraction of the piezoelectric element to the drive shaft, and drives the moving body pressed against the drive shaft using the speed difference between the expansion and contraction of the piezoelectric element. More specifically, in such a drive device, for example, by slowly extending the drive shaft, the moving body frictionally engaged with the drive shaft is also driven and moved, while the frictionally engaged friction force is generated. When the drive shaft is instantaneously reduced to the extent that it exceeds, the moving body is left in the extended position. By repeatedly performing such expansion and contraction of the drive shaft, the drive device can drive the movable body in the axial direction of the drive shaft.
　このような駆動装置では、移動体に駆動部材を所定の押圧力で押し付けることが必要である。例えば特許文献１には、ＳＩＤＭの駆動装置が開示されており、この特許文献１に開示されて駆動装置では、移動体が矩形状に形成され、この矩形状の移動体にレンズが保持されており、そして、移動体が押圧部材としての圧縮コイルバネの押圧力によって挟持部材を介して駆動軸の外周に押し付けられている。 In such a driving device, it is necessary to press the driving member against the moving body with a predetermined pressing force. For example, Patent Document 1 discloses a SIDM driving device. In the driving device disclosed in Patent Document 1, a moving body is formed in a rectangular shape, and a lens is held by the rectangular moving body. The moving body is pressed against the outer periphery of the drive shaft via the clamping member by the pressing force of the compression coil spring as the pressing member.
　しかしながら、上記特許文献１では、移動体が矩形状に形成されているため、全体の小型化、レンズの大口径化が図り難い。 However, in Patent Document 1 described above, since the moving body is formed in a rectangular shape, it is difficult to reduce the overall size and the lens diameter.
　そこで、例えば移動体を円筒状に形成することにより、全体の小型化、レンズの大口径化を図ったものも従来から実施されている。より詳しくは、例えば図１９Ａに示すように、円筒状に形成された移動体１００ａは、ガイド軸１０３に沿って移動可能に配設されているとともに、押圧部材としてのコイルバネ１０１の押圧力によって駆動部材１０２が移動体１００ａの外周に押し付けられている。その場合に、例えば図１９Ｂに示すように、円筒状の移動体１００ｂにおける径方向の肉厚が薄く形成されれば、より一層、全体の小型化、レンズの大口径化を図ることができる。 For this reason, for example, an attempt has been made to reduce the overall size and increase the diameter of the lens by forming the moving body in a cylindrical shape. More specifically, for example, as shown in FIG. 19A, the movable body 100a formed in a cylindrical shape is disposed so as to be movable along the guide shaft 103, and is driven by a pressing force of a coil spring 101 as a pressing member. The member 102 is pressed against the outer periphery of the moving body 100a. In that case, as shown in FIG. 19B, for example, if the radial thickness of the cylindrical moving body 100b is reduced, the overall size can be further reduced and the lens diameter can be increased.
　ところが、図１９Ｂに示す移動体１００ｂは、図１９Ａに示す移動体１００ａに較べて径方向の肉厚が薄いため、図１９Ｃに示すようにコイルバネ１０１の押圧力Ｗによって変形し易い。このような変形が起こると、内周側にレンズが装着され難くなってしまう。また、例えば移動体１００ｂが変形する前に内周側にレンズを装着することも考えられるが、その場合、移動体１００ｂに組み付けられたレンズが移動体１００ｂを介してバネ１０１の押圧力を受けて歪み等を起こすおそれがある。 However, since the moving body 100b shown in FIG. 19B is thinner in the radial direction than the moving body 100a shown in FIG. 19A, it is easily deformed by the pressing force W of the coil spring 101 as shown in FIG. 19C. When such deformation occurs, it becomes difficult to mount the lens on the inner peripheral side. In addition, for example, it is conceivable that a lens is mounted on the inner peripheral side before the moving body 100b is deformed. In this case, the lens assembled to the moving body 100b receives the pressing force of the spring 101 via the moving body 100b. May cause distortion.
特開２００９－２０４９２８号公報JP 2009-204928 A
　本発明は、上述の事情に鑑みて為された発明であり、その目的は、移動体が押圧部材の押圧力を受けて変形した場合でも、レンズを移動体に容易に装着でき、しかもレンズに押圧力がかかるおそれの少ない駆動装置および撮像装置を提供することである。 The present invention has been made in view of the above-described circumstances, and its object is to easily attach the lens to the moving body even when the moving body is deformed by the pressing force of the pressing member, and to the lens. It is an object of the present invention to provide a driving device and an imaging device that are less likely to be pressed.
　本発明にかかる駆動装置および撮像装置では、レンズを保持するレンズ保持部材は、その外周と、電気機械変換素子の機械エネルギーが伝達される駆動部材に押し付けられた移動体の内周と、の間に、隙間が形成されるように、前記移動体の内周側に配設される。このような本発明にかかる駆動装置および撮像装置は、移動体が押圧力を受けて変形した場合でも、レンズを移動体に容易に装着でき、しかもレンズに押圧力がかかるおそれが少ない。 In the driving device and the imaging device according to the present invention, the lens holding member that holds the lens is between the outer periphery and the inner periphery of the moving body pressed against the driving member to which the mechanical energy of the electromechanical transducer is transmitted. In addition, the movable body is disposed on the inner peripheral side so that a gap is formed. Such a drive device and an imaging device according to the present invention can easily attach the lens to the moving body even when the moving body is deformed by receiving the pressing force, and there is little possibility that the pressing force is applied to the lens.
　上記並びにその他の本発明の目的、特徴および利点は、以下の詳細な記載と添付図面から明らかになるであろう。 The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.
第１実施形態の駆動装置の斜視図である。It is a perspective view of the drive device of a 1st embodiment. 図１に示す駆動装置の分解斜視図である。It is a disassembled perspective view of the drive device shown in FIG. 図１に示す駆動装置に用いられるアクチュエータ本体の斜視図である。It is a perspective view of the actuator main body used for the drive device shown in FIG. 図１に示す駆動装置に用いられるホルダの斜視図である。It is a perspective view of the holder used for the drive device shown in FIG. 図１に示す駆動装置に用いられる移動体本体部の斜視図である。It is a perspective view of the movable body main-body part used for the drive device shown in FIG. 図５に示す移動体本体部の平面図である。It is a top view of the mobile body main-body part shown in FIG. 図１に示す駆動装置に用いられる円弧状板体の斜視図である。It is a perspective view of the circular-arc-shaped board used for the drive device shown in FIG. 図７に示す円弧状板体の平面図である。It is a top view of the circular arc-shaped board shown in FIG. 図１に示す駆動装置のカバーを外した状態の平面図である。It is a top view in the state where the cover of the drive unit shown in FIG. 1 was removed. 電極端子と圧電素子との接続部の説明図である。It is explanatory drawing of the connection part of an electrode terminal and a piezoelectric element. 前記移動体本体部と前記円弧状板体との連結状態の斜視図である。It is a perspective view of the connection state of the said mobile body main-body part and the said circular arc shaped board. 前記移動体本体部と前記円弧状板体とを治具を用いて連結する際の説明図である。It is explanatory drawing at the time of connecting the said mobile body main part and the said circular arc-shaped board body using a jig | tool. 図１に示す駆動装置に用いられるレンズ保持部材の斜視図である。It is a perspective view of the lens holding member used for the drive device shown in FIG. 図Ａは、レンズ保持部材が押圧片に押圧される前の移動体本体のレンズ保持部材収納部に収納された状態の説明図であり、図Ｂは、レンズ保持部材が押圧片に押圧された後の移動体本体のレンズ保持部材収納部に収納された状態の説明図である。FIG. A is an explanatory diagram of a state in which the lens holding member is housed in the lens holding member housing portion of the moving body before the lens holding member is pressed by the pressing piece, and FIG. B is a state in which the lens holding member is pressed by the pressing piece. It is explanatory drawing of the state accommodated in the lens holding member accommodating part of the back mobile body main body. 図Ａないし図Ｄは、レンズ保持部材がレンズ保持部材収納部に収納される際に、撮像素子基準面に対して位置決め調整される方法の説明図である。FIGS. A to D are explanatory views of a method of adjusting the positioning with respect to the imaging element reference plane when the lens holding member is housed in the lens holding member housing portion. 図Ａは、レンズ保持部材が、撮像素子基準面に対して位置決め調整されてレンズ保持部材収納部に収納された状態の駆動装置の説明図であり、図Ｂは、レンズ保持部材が、レンズ保持部材収納部の下面に位置決め調整されて収納された状態の比較例の説明図である。FIG. A is an explanatory diagram of a driving device in a state in which the lens holding member is positioned and adjusted with respect to the imaging element reference plane and is stored in the lens holding member storage portion, and FIG. It is explanatory drawing of the comparative example of the state accommodated by the positioning adjustment on the lower surface of a member accommodating part. 第１実施形態の駆動装置を有する撮像装置の断面図である。It is sectional drawing of the imaging device which has the drive device of 1st Embodiment. 図Ａは、第２実施形態の駆動装置の概略の平面図であり、図Ｂは、図１８Ａの一部を断面にした側面図である。FIG. A is a schematic plan view of a driving apparatus according to the second embodiment, and FIG. B is a side view of a part of FIG. 18A in cross section. 従来例の説明図に係り、図Ａは、円筒状の移動体を有する従来例の説明図であり、図Ｂは、径方向の肉厚を薄くした移動体を有する他の従来例の説明図であり、図Ｃは、図１９Ｂに示す移動体が押圧部材の押圧力によって変形した状態の説明図である。FIG. A is an explanatory diagram of a conventional example having a cylindrical moving body, and FIG. B is an explanatory diagram of another conventional example having a moving body with a reduced radial thickness. FIG. C is an explanatory diagram of a state in which the moving body shown in FIG. 19B is deformed by the pressing force of the pressing member.
　以下、本発明にかかる実施の一形態を図面に基づいて説明する。なお、各図において同一の符号を付した構成は、同一の構成であることを示し、適宜、その説明を省略する。本明細書において、総称する場合には添え字を省略した参照符号で示し、個別の構成を指す場合には添え字を付した参照符号で示す。 Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. In this specification, when referring generically, it shows with the reference symbol which abbreviate | omitted the suffix, and when referring to an individual structure, it shows with the reference symbol which attached the suffix.
　図１は、第１実施形態にかかる駆動装置の斜視図である、図２は、図１に示す駆動装置の分解斜視図である。なお、以下の説明において、図１～図３、図５、図７、図１０～図１３、図１５～図１８におけるＸ方向を上側（対物側）とし、Ｙ方向を下側（像側）として説明する。 FIG. 1 is a perspective view of the drive device according to the first embodiment, and FIG. 2 is an exploded perspective view of the drive device shown in FIG. In the following description, the X direction in FIGS. 1 to 3, 5, 7, 10, 10 to 13, and 15 to 18 is the upper side (object side), and the Y direction is the lower side (image side). Will be described.
　本実施形態の駆動装置１は、例えば携帯電話などに搭載可能な撮像装置に用いられる。この実施形態の駆動装置１は、図１、図２に示すように、ホルダ２と、ホルダ２に保持されたアクチュエータ本体３と、アクチュエータ本体３に保持された移動体４と、移動体４とアクチュエータ本体３とを互いに押圧させた押圧片（押圧部材）６３と、レンズ保持部材９と、カバー８とを備えている。 The drive device 1 of the present embodiment is used for an imaging device that can be mounted on, for example, a mobile phone. As shown in FIGS. 1 and 2, the drive device 1 of this embodiment includes a holder 2, an actuator body 3 held by the holder 2, a moving body 4 held by the actuator body 3, and a moving body 4. A pressing piece (pressing member) 63 that presses the actuator body 3 with each other, a lens holding member 9, and a cover 8 are provided.
　ホルダ２は、図４に示すように、ＬＣＰ（液晶ポリマー）などの樹脂材料からなり、後述の電極端子２２、２３の一部をインサートした射出成形により形成されている。この実施形態のホルダ２は、外周が矩形状を呈し、中心部に光路となる円形状の貫通孔２０ｇを有する筒状体からなる。 As shown in FIG. 4, the holder 2 is made of a resin material such as LCP (liquid crystal polymer), and is formed by injection molding in which part of electrode terminals 22 and 23 described later are inserted. The holder 2 of this embodiment is a cylindrical body having a rectangular outer periphery and a circular through hole 20g serving as an optical path at the center.
　このホルダ２は、左前方側の第１隅角部２ａに、第１支持柱２０ａを備えている。ホルダ２は、第１隅角部２ａにおける第１支持柱２０ａの内側に、アクチュエータ本体３を保持するアクチュエータ固定部２１を備えている。 The holder 2 includes a first support column 20a at the first corner 2a on the left front side. The holder 2 includes an actuator fixing portion 21 that holds the actuator body 3 inside the first support pillar 20a in the first corner portion 2a.
　このアクチュエータ固定部２１は、ホルダ２の上面２ｅから所定の深さで円柱状に窪まされるように形成され上方が開放されている。 The actuator fixing portion 21 is formed so as to be recessed in a cylindrical shape with a predetermined depth from the upper surface 2e of the holder 2, and the upper side is opened.
　ホルダ２は、第１隅角部２ａにおけるアクチュエータ固定部２１を挟んでその両側に、第１電極端子２２の先端２２ａと第２電極端子２３の先端２３ａとがホルダ２の上方側に突出するように配設されている。 The holder 2 has a tip 22a of the first electrode terminal 22 and a tip 23a of the second electrode terminal 23 protruding above the holder 2 on both sides of the actuator fixing portion 21 in the first corner 2a. It is arranged.
　これらの第１電極端子２２および第２電極端子２３は、それぞれ、その中間部がホルダ２に埋設され、その基端側がホルダ２の外側面から突設されて外部接続端子２２ｂ、２３ｂをなしている。そして、この駆動装置１が搭載される図示しない携帯電話の回路基板やコネクタと、この外部接続端子２２ｂ、２３ｂとが接続される。 Each of the first electrode terminal 22 and the second electrode terminal 23 has an intermediate portion embedded in the holder 2 and a proximal end projecting from the outer surface of the holder 2 to form external connection terminals 22b and 23b. Yes. And the circuit board and connector of the mobile phone which are not shown in which this drive device 1 is mounted, and these external connection terminals 22b and 23b are connected.
　この実施形態では、図１０に示すように第１電極端子２２の外部接続端子２２ｂおよび第２電極端子２３の外部接続端子２３ｂは、それぞれ、互いの外部接続端子２２ｂ、２２ｂの下面同士が面一になるように、段部を介して折り曲げ成形されている。これにより、第１電極端子２２の外部接続端子２２ｂおよび第２電極端子２３の外部接続端子２３ｂのそれぞれが、例えば携帯電話の回路基板に置かれることにより回路基板に通電可能に接続できるようになっている。 In this embodiment, as shown in FIG. 10, the external connection terminals 22b of the first electrode terminals 22 and the external connection terminals 23b of the second electrode terminals 23 are flush with the lower surfaces of the external connection terminals 22b and 22b, respectively. It is bent and formed through the step portion. Thereby, each of the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b of the second electrode terminal 23 can be connected to the circuit board so as to be energized by being placed on the circuit board of the mobile phone, for example. ing.
　ホルダ２は、図４に示すように第２隅角部２ｂ、第３隅角部２ｃおよび第４隅角部２ｄに、それぞれ、第２支持柱２０ｂ、第３支持柱２０ｃ、第４支持柱２０ｄを備えている。また、第３支持柱２０ｃに、後述の移動体４の回転規制部６１ａを上下方向に移動可能に受容する規制部受容溝２９が形成されている。 As shown in FIG. 4, the holder 2 has a second support column 20b, a third support column 20c, and a fourth support column at the second corner portion 2b, the third corner portion 2c, and the fourth corner portion 2d, respectively. 20d. The third support pillar 20c is formed with a restricting portion receiving groove 29 for receiving a rotation restricting portion 61a of the moving body 4 described later so as to be movable in the vertical direction.
　ホルダ２は、下面に、撮像素子を取り付ける際の撮像素子取付基準面１９ａを備えている。この実施形態では、ホルダ２の下面の略全体が撮像素子取付基準面１９ａをなしており、図１７に示すように撮像素子５０３を有するセンサ基板５０４がこの撮像素子取付基準面１９ａに取り付けられることにより、撮像素子５０３の光学面が撮像素子取付基準面１９ａと平行に配設されるようになっている。 The holder 2 includes an image sensor attachment reference surface 19a on the lower surface when the image sensor is attached. In this embodiment, substantially the entire lower surface of the holder 2 forms the image sensor attachment reference surface 19a, and the sensor substrate 504 having the image sensor 503 is attached to the image sensor attachment reference surface 19a as shown in FIG. Thus, the optical surface of the image sensor 503 is arranged in parallel with the image sensor attachment reference surface 19a.
　アクチュエータ本体３は、図３に示すように軸方向に伸縮する電気機械変換素子である圧電素子３１と、圧電素子３１の一端に接合された駆動軸３２と、圧電素子３１の他端に接合された錘３３とを備えている。 As shown in FIG. 3, the actuator body 3 is joined to a piezoelectric element 31 that is an electromechanical conversion element that expands and contracts in the axial direction, a drive shaft 32 joined to one end of the piezoelectric element 31, and the other end of the piezoelectric element 31. The weight 33 is provided.
　錘３３は、圧電素子３１の伸縮による変位を駆動軸３２側に効率よく発生させるためのものである。この実施形態では、錘３３は、タングステンやタングステン合金など比重の高い材料から形成されている。 The weight 33 is for efficiently generating displacement due to expansion and contraction of the piezoelectric element 31 on the drive shaft 32 side. In this embodiment, the weight 33 is made of a material having a high specific gravity such as tungsten or a tungsten alloy.
　錘３３は、外径が圧電素子３１の外周から全周に渡って外周方向に突出するように形成された円柱状である。 The weight 33 is a cylindrical shape formed so that the outer diameter protrudes from the outer periphery of the piezoelectric element 31 to the outer periphery over the entire periphery.
　なお、この錘３３は、圧電素子３１の他端がホルダ２に取付けられるなどして、錘３３の機能と同様の機能を発揮することができる場合には、省略されてもよい。 The weight 33 may be omitted when the other end of the piezoelectric element 31 can be attached to the holder 2 and the same function as the weight 33 can be exhibited.
　圧電素子３１は、入力の電気エネルギーを、伸縮する機械エネルギー、すなわち、機械的な運動に変換する素子であり、例えば、入力の電気エネルギーを圧電効果によって機械的な伸縮運動に変換する圧電素子等である。このような圧電素子は、例えば、積層体と、一対の外部電極とを備えている。 The piezoelectric element 31 is an element that converts input electric energy into mechanical energy that expands and contracts, that is, mechanical motion. For example, a piezoelectric element that converts input electric energy into mechanical elastic motion by a piezoelectric effect, or the like It is. Such a piezoelectric element includes, for example, a laminated body and a pair of external electrodes.
　積層体は、圧電材料から成る薄膜状（層状）の圧電層と導電性を有する薄膜状（層状）の内部電極層とを交互に複数積層して成るものである。積層体は、本実施形態では、四角柱形状となっているが、これに限定されるものではなく、例えば、多角柱状や円柱形状等であってよい。 The laminate is formed by alternately laminating a plurality of thin film (layered) piezoelectric layers made of a piezoelectric material and a conductive thin film (layered) internal electrode layer. In the present embodiment, the laminate has a quadrangular prism shape, but is not limited to this, and may be, for example, a polygonal column shape or a cylindrical shape.
　複数の内部電極層は、その一部が互いに対向する一対の外周側面で外部に臨むようにそれぞれ構成されている。一対の外部電極は、積層体における前記一対の外周側面上に積層方向に沿って形成され、前記電気エネルギーを積層体に供給するものであり、前記複数の内部電極と順次交互に接続されている。 The plurality of internal electrode layers are each configured such that a part thereof faces the outside with a pair of outer peripheral side surfaces facing each other. The pair of external electrodes are formed along the stacking direction on the pair of outer peripheral side surfaces in the stacked body, and supply the electric energy to the stacked body, and are sequentially and alternately connected to the plurality of internal electrodes. .
　圧電材料は、例えば、チタン酸ジルコン酸鉛（いわゆるＰＺＴ）、水晶、ニオブ酸リチウム（ＬｉＮｂＯ３）、ニオブ酸タンタル酸カリウム（Ｋ（Ｔａ，Ｎｂ）Ｏ３）、チタン酸バリウム（ＢａＴｉＯ３）、タンタル酸リチウム（ＬｉＴａＯ３）およびチタン酸ストロンチウム（ＳｒＴｉＯ３）等の無機圧電材料である。 Examples of the piezoelectric material include lead zirconate titanate (so-called PZT), crystal, lithium niobate (LiNbO 3 ), potassium tantalate niobate (K (Ta, Nb) O 3 ), barium titanate (BaTiO 3 ), Inorganic piezoelectric materials such as lithium tantalate (LiTaO 3 ) and strontium titanate (SrTiO 3 ).
　圧電素子３１は、各層間の電極を並列に接続する外部電極３１ａが対向する２つの側面に銀などをスパッタするなどして形成されている。 The piezoelectric element 31 is formed by sputtering silver or the like on two side surfaces opposed to each other by external electrodes 31a that connect electrodes between layers in parallel.
　そして、この圧電素子３１は、下端面が錘３３の上端面に、エポキシ系接着剤等の接合用接着剤により接着されている。この実施形態では、接合用接着剤は、錘との短絡防止および接着層厚を安定化させるため、直径５μｍ程度の樹脂性のビーズをエポキシ系接着剤に混入したものが用いられている。 The lower end surface of the piezoelectric element 31 is bonded to the upper end surface of the weight 33 with a bonding adhesive such as an epoxy adhesive. In this embodiment, a bonding adhesive is used in which resinous beads having a diameter of about 5 μm are mixed in an epoxy adhesive in order to prevent a short circuit with the weight and stabilize the thickness of the adhesive layer.
　駆動軸３２は、軸方向にカーボン繊維が配列するようにして樹脂により円柱状に成形されたＣＦＲＰ（炭素繊維強化プラスチック）からなる。この実施形態の駆動軸３２は、外径が圧電素子３１の外周から全周に渡って外周方向に突出するように形成されている。 The drive shaft 32 is made of CFRP (carbon fiber reinforced plastic) molded in a cylindrical shape with resin so that carbon fibers are arranged in the axial direction. The drive shaft 32 of this embodiment is formed so that the outer diameter protrudes from the outer periphery of the piezoelectric element 31 to the outer periphery over the entire periphery.
　駆動軸３２は、その下端面が圧電素子３１の上端面に、接合用接着剤により接着されている。この接合用接着剤は、圧電素子３１と錘３３とを接着した接合用接着剤と同じものである。 The lower end surface of the drive shaft 32 is bonded to the upper end surface of the piezoelectric element 31 with a bonding adhesive. This bonding adhesive is the same as the bonding adhesive obtained by bonding the piezoelectric element 31 and the weight 33.
　接合用接着剤は、駆動軸３２と圧電素子３１との接合面からはみ出た接合用接着剤（フィレット）は、圧電素子側に形成され、これにより、駆動軸３２の全領域を移動体４との摺動に使うことができ、短い駆動軸３２で大きなストロークが実現できるようにされている。 A bonding adhesive (fillet) that protrudes from the bonding surface between the drive shaft 32 and the piezoelectric element 31 is formed on the piezoelectric element side, so that the entire region of the drive shaft 32 is connected to the moving body 4. And a large stroke can be realized with the short drive shaft 32.
　このように構成されたアクチュエータ本体３は、図３に示すように錘３３側（一端側）を下にしてホルダ２のアクチュエータ固定部２１に上方側から嵌挿されるようにして配置され、ホルダ固定用接着剤によってアクチュエータ固定部２１と錘３３とが接着されて固定されている。 As shown in FIG. 3, the actuator main body 3 configured in this way is arranged so that the weight 33 side (one end side) faces down and is fitted and inserted into the actuator fixing portion 21 of the holder 2 from above, and is fixed to the holder. The actuator fixing portion 21 and the weight 33 are bonded and fixed by the adhesive for use.
　このようにしてホルダ２のアクチュエータ固定部２１に保持されたアクチュエータ本体３は、２つの第１電極連結バネ２４ａおよび第２電極連結バネ２４ｂを介して圧電素子３１の外部電極３１ａと、第１電極端子２２の先端２２ａおよび第２電極端子２３の先端２３ａのそれぞれが通電可能に接続されている。 In this way, the actuator body 3 held by the actuator fixing portion 21 of the holder 2 includes the first electrode and the external electrode 31a of the piezoelectric element 31 via the two first electrode connection springs 24a and the second electrode connection spring 24b. Each of the tip 22a of the terminal 22 and the tip 23a of the second electrode terminal 23 is connected to be energized.
　より詳しくは、図１０に示すように第１電極連結バネ２４ａと第２電極連結バネ２４ｂとは、同構成を採っており、それぞれは、金や白金などでメッキが施されており、コイル部２５ａと、コイル部２５ａから径方向外側に突設された第１足部２５ｂおよび第２足部２５ｃとを備えたねじりコイルバネから構成されている。 More specifically, as shown in FIG. 10, the first electrode connection spring 24a and the second electrode connection spring 24b have the same configuration, and each of them is plated with gold or platinum, and the coil portion. 25a and a torsion coil spring provided with a first foot portion 25b and a second foot portion 25c projecting radially outward from the coil portion 25a.
　そして、第１電極連結バネ２４ａは、コイル部２５ａに第１電極端子２２の先端２２ａが押し入れられるようにして、第１足部２５ｂが圧電素子３１の一方の外部電極３１ａに当接し、第２足部２５ｃがホルダ２に設けられたバネ係止部２６（図９に図示）に係止されている。この状態で、コイル部２５ａにねじり力が蓄積してそのねじり力によって第１足部２５ｂが圧電素子３１の外部電極３１ａを押圧した状態になっている。 The first electrode connecting spring 24a is configured such that the tip 22a of the first electrode terminal 22 is pushed into the coil portion 25a, the first foot portion 25b is in contact with one external electrode 31a of the piezoelectric element 31, and the second The foot portion 25 c is locked to a spring locking portion 26 (shown in FIG. 9) provided on the holder 2. In this state, a torsional force is accumulated in the coil portion 25a, and the first foot 25b presses the external electrode 31a of the piezoelectric element 31 by the torsional force.
　第２電極連結バネ２４ｂは、コイル部２５ａに第２電極端子２３の先端２３ａが押し入れられるようにして、第１足部２５ｂが圧電素子３１の他方の外部電極３１ａに当接し、第２足部２５ｃがホルダ２のバネ係止部２６（図９参照）に係止されている。そして、その状態で、コイル部２５ａにねじり力が蓄積してそのねじり力によって第１足部２５ｂが圧電素子３１の外部電極３１ａを押圧した状態になっている。 The second electrode connecting spring 24b is such that the tip 23a of the second electrode terminal 23 is pushed into the coil portion 25a, the first foot 25b abuts against the other external electrode 31a of the piezoelectric element 31, and the second foot 25c is locked to a spring locking portion 26 (see FIG. 9) of the holder 2. In this state, a torsional force is accumulated in the coil portion 25a, and the first leg 25b presses the external electrode 31a of the piezoelectric element 31 by the torsional force.
　この実施形態では、第１電極連結バネ２４ａおよび第２電極連結バネ２４ｂのそれぞれの第１足部２５ｂと圧電素子３１の外部電極３１ａとの当接部からコイル部２５ａにかけて導電性接着剤２７が介在するように配設されている。これにより、第１電極連結バネ２４ａおよび第２電極連結バネ２４ｂに加えて、導電性接着剤２７が圧電素子３１の外部電極３１ａと第１電極端子２２および第２電極端子２３とを通電可能に接続し、両者の接続をより確実なものにしている。 In this embodiment, the conductive adhesive 27 is applied from the contact portion between the first leg portion 25b of each of the first electrode connection spring 24a and the second electrode connection spring 24b and the external electrode 31a of the piezoelectric element 31 to the coil portion 25a. It arrange | positions so that it may interpose. Thereby, in addition to the 1st electrode connection spring 24a and the 2nd electrode connection spring 24b, the conductive adhesive 27 can energize the external electrode 31a of the piezoelectric element 31, and the 1st electrode terminal 22 and the 2nd electrode terminal 23. Connected to ensure a secure connection between the two.
　この実施形態では、導電性接着剤２７は、その表面に、補強接着剤２８によって被覆され、導電性接着剤２７の接着強度が補強されている。 In this embodiment, the surface of the conductive adhesive 27 is covered with the reinforcing adhesive 28, and the adhesive strength of the conductive adhesive 27 is reinforced.
　次に、移動体４について説明する。移動体４は、駆動軸３２に所定の摩擦力で係合され、駆動軸３２の軸方向に沿って摺動する。この実施形態の移動体４は、図２に示すように金属製の円筒状の移動体本体部５と、移動体本体部５とは別体の円弧状板体（金属製板体）６とを備えている。 Next, the moving body 4 will be described. The moving body 4 is engaged with the drive shaft 32 with a predetermined frictional force, and slides along the axial direction of the drive shaft 32. As shown in FIG. 2, the moving body 4 of this embodiment includes a metal cylindrical moving body main body 5, and an arcuate plate (metal plate) 6 that is separate from the moving body main body 5. It has.
　移動体本体部５は、この実施形態では、ステンレス製で、０．０５ｍｍ～０．３ｍｍの厚さで、絞り加工により形成されている。ステンレス材は、金属材料の中でも、安価で成形性がよく、耐久性もよく、駆動性能も良好な材料である。 In this embodiment, the movable body main body 5 is made of stainless steel and has a thickness of 0.05 mm to 0.3 mm and is formed by drawing. Stainless steel is a material that is inexpensive, has good moldability, good durability, and good driving performance among metal materials.
　この移動体本体部５は、図５、図６に示すように内周側にレンズ保持部材収納部５４を備え、このレンズ保持部材収納部５４にレンズ保持部材９が収納されて固定的に保持される。 As shown in FIGS. 5 and 6, the movable body main body 5 includes a lens holding member storage portion 54 on the inner peripheral side, and the lens holding member 9 is stored and fixedly held in the lens holding member storage portion 54. Is done.
　移動体本体部５は、外周面の一部に、駆動軸を摺動する第１摺動面５１を備えている。この第１摺動面５１は、この実施形態では、移動体本体部５の成形加工に際し、移動体本体部５の一部を、周方向に所定の幅で軸方向の全体に亘って平板状にすることによって平面に形成されている。このため、移動体本体部が駆動軸を摺動するに際して、移動体本体部が駆動軸に対して傾くことなく一定の姿勢を保持しながら摺動できる。 The movable body main body 5 includes a first sliding surface 51 that slides on the drive shaft on a part of the outer peripheral surface. In this embodiment, the first sliding surface 51 is formed in a flat plate shape with a predetermined width in the circumferential direction over the entire axial direction when molding the movable body main body 5. Is formed in a plane. For this reason, when the movable body main body slides on the drive shaft, the movable body main body can slide while maintaining a constant posture without being inclined with respect to the drive shaft.
　この実施形態の移動体本体部５は、下端に、径方向内側に突出するように形成された第１フランジ５２を備えているとともに、上端に、径方向外側に突出するように形成された第２フランジ５３を備えており、これらによって移動体本体部５の強度を高めている。 The movable body main body 5 of this embodiment includes a first flange 52 formed at the lower end so as to protrude radially inward, and a first end formed at the upper end so as to protrude radially outward. Two flanges 53 are provided, and these increase the strength of the movable body main body 5.
　このように、移動体本体部５が金属製の筒であるため強度や摩耗に対する耐久性が高く、また薄肉の金属筒のため内部に保持されるレンズ７１の大口径化を図ることが可能となる。さらに、駆動軸３２が移動体本体部５に直接当接して駆動するため、アクチュエータ本体３と摩擦係合する部位をレンズ７１を保持する部位と別に設ける構成に比べ、移動体本体部５の内部に保持されるレンズ７１の大口径化を図ることができる。 As described above, since the movable body main body 5 is a metal tube, it has high durability and durability against wear, and since it is a thin metal tube, it is possible to increase the diameter of the lens 71 held inside. Become. Further, since the drive shaft 32 is driven in direct contact with the moving body main body 5, the inside of the moving body main body 5 is compared with a configuration in which a portion that frictionally engages the actuator main body 3 is provided separately from the portion that holds the lens 71. It is possible to increase the diameter of the lens 71 held by the lens.
　円弧状板体６は、この実施形態では、ステンレス製で、０．１ｍｍ～０．２ｍｍの厚さで形成されている。この円弧状板体６は、図７、図８に示すように円弧部６１と、円弧部６１の一端側に形成されたガイド部６２とを備えている。 In this embodiment, the arcuate plate 6 is made of stainless steel and has a thickness of 0.1 mm to 0.2 mm. As shown in FIGS. 7 and 8, the arcuate plate 6 includes an arc portion 61 and a guide portion 62 formed on one end side of the arc portion 61.
　円弧部６１は、ガイド部６２から周方向に略半周（中心角で１８０°）隔てた位置に、回転規制部６１ａを備えている。この回転規制部６１ａは、駆動軸３２に対する移動体４の軸心回りの回転を規制するためのもので、規制枠部６１ｂと、規制枠部６１ｂに形成された半球状の突起６１ｃとを備えている。 The arc portion 61 includes a rotation restricting portion 61a at a position separated from the guide portion 62 by a substantially half circumference (180 ° in the central angle) in the circumferential direction. The rotation restricting portion 61a is for restricting rotation of the movable body 4 around the axis of the drive shaft 32, and includes a restricting frame portion 61b and a hemispherical protrusion 61c formed on the restricting frame portion 61b. ing.
　規制枠部６１ｂは、円弧部６１の一部を径方向外側に矩形状に突出させるようにして形成されている。 The restriction frame portion 61b is formed so that a part of the arc portion 61 protrudes radially outward in a rectangular shape.
　突起６１ｃは、規制枠部６１ｂの両外側面のそれぞれから外方に突出させるようにして形成されている。また、突起６１ｃ同士の外幅Ｗ１（図９に図示）は、ホルダ２の規制部受容溝２９の内幅Ｗ２（図９に図示）よりも若干狭く設定されている。なお、図９では、突起６１ｃ同士の外幅Ｗ１と規制部受容溝２９の内幅Ｗ２とを同じに表している。 The protrusion 61c is formed so as to protrude outward from both outer side surfaces of the restriction frame portion 61b. Further, the outer width W1 (shown in FIG. 9) between the protrusions 61c is set to be slightly narrower than the inner width W2 (shown in FIG. 9) of the restricting portion receiving groove 29 of the holder 2. In FIG. 9, the outer width W <b> 1 between the protrusions 61 c and the inner width W <b> 2 of the restricting portion receiving groove 29 are the same.
　この実施形態では、円弧部６１は、一端（ガイド部６２）と回転規制部６１ａとの間に、他の部分よりも幅が狭い幅狭部６１ｄを備えている。 In this embodiment, the circular arc part 61 is provided with a narrow part 61d having a narrower width than the other part between one end (guide part 62) and the rotation restricting part 61a.
　ガイド部６２は、円弧部６１の一端側の一部を円弧部６１の径方向外側に折り曲げ成形することにより形成されており、その一方面に、駆動軸３２を摺動する第２摺動面６２ａを備えている。 The guide portion 62 is formed by bending a part of one end side of the arc portion 61 outward in the radial direction of the arc portion 61, and a second sliding surface that slides the drive shaft 32 on one surface thereof. 62a is provided.
　次に、押圧片６３について説明する。この実施形態の押圧片６３は、円弧部６１の他端から段部を介して直線状に延設されるようにして円弧状板体６と一体的に形成されており、その先端部に、駆動軸３２を押圧する押圧部６３ａを備えている。この実施形態の押圧部６３ａは、第１摺動面５１および第２摺動面６２ａよりも幅狭に形成されている。 Next, the pressing piece 63 will be described. The pressing piece 63 of this embodiment is integrally formed with the arc-shaped plate 6 so as to extend linearly from the other end of the arc portion 61 through the stepped portion, A pressing portion 63 a that presses the drive shaft 32 is provided. The pressing portion 63a of this embodiment is formed narrower than the first sliding surface 51 and the second sliding surface 62a.
　押圧片６３が一体的に形成された円弧状板体６と移動体本体部５とは、溶接によって固定的に連結されている。 The arcuate plate body 6 on which the pressing piece 63 is integrally formed and the movable body main body 5 are fixedly connected by welding.
　より詳しくは、図１１に示すように、移動体本体部５の第１摺動面５１と円弧状板体６の第２摺動面６２ａとが隣接するようにして、移動体本体部５の外周に円弧状板体６が巻き付けられるようにして配設される。 More specifically, as shown in FIG. 11, the first sliding surface 51 of the moving body main body 5 and the second sliding surface 62 a of the arcuate plate 6 are adjacent to each other. It arrange | positions so that the circular arc-shaped board 6 may be wound around outer periphery.
　そして、この状態で、両者は、複数個所（この実施形態では、図７に×印で示した４箇所）を抵抗溶接（スポット溶接）、レーザ溶接等の溶接を実施することによって固定されている。この溶接によって押圧片６３が、移動体４の移動体本体部５の外周と連結部５５で連結されている。 And in this state, both are fixed by performing welding, such as resistance welding (spot welding) and laser welding, at a plurality of locations (in this embodiment, four locations indicated by x in FIG. 7). . By this welding, the pressing piece 63 is connected to the outer periphery of the moving body main body 5 of the moving body 4 by the connecting portion 55.
　この実施形態では、その溶接に際し、図１２に示すように回転規制部６１ａを把持した位置決め治具１１およびガイド部６２を把持した第２摺動面姿勢調整治具１２を用いて、移動体本体部５と円弧状板体６との互いの位置、および、第２摺動面の姿勢を決めた上で溶接が行われる。その際、例えば第２摺動面の姿勢を設定する場合に、円弧部６１の幅狭部６１ｄによって第２摺動面の姿勢を設定し易くなっている。 In this embodiment, at the time of the welding, as shown in FIG. 12, the movable body main body is used by using the positioning jig 11 that holds the rotation restricting portion 61a and the second sliding surface posture adjusting jig 12 that holds the guide portion 62. Welding is performed after determining the position of the part 5 and the arcuate plate 6 and the attitude of the second sliding surface. At this time, for example, when the posture of the second sliding surface is set, the posture of the second sliding surface is easily set by the narrow portion 61 d of the arc portion 61.
　この溶接によって固定された状態で、第１摺動面５１と第２摺動面６２ａとが略直角になって、両者は、Ｌ字状をなしている。 In the state fixed by this welding, the first sliding surface 51 and the second sliding surface 62a are substantially perpendicular, and both are L-shaped.
　このようにして移動体本体部５と円弧状板体６とをステンレス等の金属から構成し、溶接によって結合することで、強固に固定できるとともに、接着などと異なり瞬時に固定できるので、製造上のタクトタイムを大幅に短縮できる。 In this way, the movable body main body 5 and the arcuate plate body 6 are made of a metal such as stainless steel, and can be fixed firmly by welding, and can be fixed instantaneously unlike bonding. Tact time can be greatly reduced.
　そして、移動体本体部５と円弧状板体６とが連結された状態で、次のようにして、アクチュエータ本体３の駆動軸３２に軸方向移動可能に押し付けられて摩擦係合されている。 In a state where the movable body main body 5 and the arcuate plate 6 are connected, the movable body is pressed against the drive shaft 32 of the actuator body 3 so as to be axially movable and frictionally engaged as follows.
　図９に示すように、回転規制部６１ａが、ホルダ２の規制部受容溝２９に入れ、ホルダ２に保持されたアクチュエータ本体３の駆動軸３２が、第１摺動面５１と第２摺動面６２ａと押圧部６３ａとで囲まれるように配置される。 As shown in FIG. 9, the rotation restricting portion 61 a is placed in the restricting portion receiving groove 29 of the holder 2, and the drive shaft 32 of the actuator body 3 held by the holder 2 is connected to the first sliding surface 51 and the second sliding portion. It arrange | positions so that it may be enclosed by the surface 62a and the press part 63a.
　これにより、押圧片６３の押圧力によって第１摺動面５１が駆動軸３２の外周に押し付けられ、移動体４は、アクチュエータ本体３の駆動軸３２に軸方向移動可能に保持された状態になる。 Thereby, the first sliding surface 51 is pressed against the outer periphery of the drive shaft 32 by the pressing force of the pressing piece 63, and the moving body 4 is held by the drive shaft 32 of the actuator body 3 so as to be movable in the axial direction. .
　この状態で、押圧片６３は、ホルダ２の第２隅角部２ｂから第１隅角部２ａに延された状態になっている。第１摺動面５１は、駆動軸３２の軸方向の上側から見て、ホルダ２の中心Ｏ１と駆動軸３２の軸心Ｏ２とを結ぶ線Ｐと垂直になり、第２摺動面６２ａは、上記線Ｐと平行になっている。 In this state, the pressing piece 63 is in a state extending from the second corner 2b of the holder 2 to the first corner 2a. The first sliding surface 51 is perpendicular to a line P connecting the center O1 of the holder 2 and the axis O2 of the driving shaft 32 when viewed from the upper side in the axial direction of the driving shaft 32, and the second sliding surface 62a is , Parallel to the line P.
　次に、レンズ保持部材９について説明する。レンズ保持部材９は、レンズ７１（図１７に図示）を保持する。この実施形態では、レンズ保持部材９は、液晶ポリマー（ＬＣＰ）等の合成樹脂からなり、射出成形により円筒状に形成されている。 Next, the lens holding member 9 will be described. The lens holding member 9 holds a lens 71 (shown in FIG. 17). In this embodiment, the lens holding member 9 is made of a synthetic resin such as liquid crystal polymer (LCP) and is formed in a cylindrical shape by injection molding.
　このレンズ保持部材９は、内周側に、レンズ支持部９１を備え、このレンズ支持部９１に、１または複数のレンズ７１が支持されるようになっている。 The lens holding member 9 includes a lens support portion 91 on the inner peripheral side, and one or a plurality of lenses 71 are supported on the lens support portion 91.
　この実施形態のレンズ支持部９１は、レンズ保持部材９の内周に形成された雌ネジ部から構成されている。 The lens support portion 91 of this embodiment is composed of a female screw portion formed on the inner periphery of the lens holding member 9.
　レンズ保持部材９は、その外周と移動体本体部５のレンズ保持部材収納部５４との間に隙間９２ができる程度に形成されている。この実施形態では、図１４Ａに示すように押圧部６３ａの押圧力で押圧変形されていない成形時の移動体本体部５のレンズ保持部材収納部５４にレンズ保持部材９が入れられた場合に、レンズ保持部材収納部５４の内周とレンズ保持部材９の外周との間に、押圧部６３ａの押圧力で移動体本体部５のみが変形し得る隙間９２が、全周に亘って形成されるようになっている。 The lens holding member 9 is formed to have a gap 92 between the outer periphery thereof and the lens holding member storage portion 54 of the movable body main body 5. In this embodiment, as shown in FIG. 14A, when the lens holding member 9 is put in the lens holding member storage portion 54 of the movable body main body 5 at the time of molding that is not pressed and deformed by the pressing force of the pressing portion 63a. Between the inner periphery of the lens holding member storage portion 54 and the outer periphery of the lens holding member 9, a gap 92 is formed over the entire circumference so that only the movable body main body 5 can be deformed by the pressing force of the pressing portion 63a. It is like that.
　換言すれば、レンズ保持部材９の外径Ｒ１は、図１４Ｂに示すように押圧片６３の押圧力Ｗで押圧変形された後の状態において、移動体本体部５のレンズ保持部材収納部５４における最小径Ｒ２と同程度に設定されている。より詳しくは、この実施形態では、移動体本体部５は、押圧片６３の押圧力で第１摺動面５１が駆動軸３２に押圧されると、押圧片６３との連結部５５を反力部にして変形する。そして、レンズ保持部材９の外径Ｒ１は、その変形した移動体本体部５のレンズ保持部材収納部５４の最小径Ｒ２と同程度に設定されている。 In other words, the outer diameter R1 of the lens holding member 9 is in the lens holding member storage portion 54 of the movable body main body 5 in a state after being deformed by the pressing force W of the pressing piece 63 as shown in FIG. 14B. It is set to the same level as the minimum diameter R2. More specifically, in this embodiment, when the first sliding surface 51 is pressed against the drive shaft 32 by the pressing force of the pressing piece 63, the moving body main body 5 causes the connecting portion 55 with the pressing piece 63 to react with the reaction force. It transforms into a part. The outer diameter R1 of the lens holding member 9 is set to be approximately the same as the minimum diameter R2 of the lens holding member storage portion 54 of the deformed movable body main body 5.
　このように構成されたレンズ保持部材９は、第１摺動面５１が押圧片６３の押圧力によって駆動軸３２の外周に押し付けられて変形した図１４Ｂに示す状態の移動体本体部５におけるレンズ保持部材収納部５４に挿入される。 The lens holding member 9 configured as described above has the lens in the movable body main body 5 in the state shown in FIG. 14B in which the first sliding surface 51 is deformed by being pressed against the outer periphery of the drive shaft 32 by the pressing force of the pressing piece 63. It is inserted into the holding member storage portion 54.
　その際、レンズ保持部材９の外周が、変形した状態の移動体本体部５におけるレンズ保持部材収納部５４の最小径Ｒ２と同程度に設定されているため、レンズ保持部材９は、レンズ保持部材収納部５４に容易に挿入される。 At this time, since the outer periphery of the lens holding member 9 is set to be approximately the same as the minimum diameter R2 of the lens holding member storage portion 54 in the movable body main body 5 in a deformed state, the lens holding member 9 is the lens holding member. It is easily inserted into the storage portion 54.
　この実施形態では、レンズ保持部材９が移動体本体部５のレンズ保持部材収納部５４に収納される際に、レンズ保持部材９が予め設定された撮像素子基準面２００に位置合わせ調整されて収納される。この位置合わせ調整する方法として、例えば次のような方法が挙げられる。 In this embodiment, when the lens holding member 9 is stored in the lens holding member storage portion 54 of the movable body main body 5, the lens holding member 9 is aligned and adjusted to a preset image sensor reference surface 200. Is done. As a method for adjusting the alignment, for example, the following method can be cited.
　例えば図１５Ａに示すように、撮像素子基準面２００は、後述する撮像素子５０３（図１７に図示）と平行な面に予め設定されており、その撮像素子基準面２００にホルダ２が載置されている。そして、コリメータ２０１によって、レンズ保持部材９のレンズ支持部９１の軸Ｏ１が撮像素子基準面２００と垂直になるように調整する。 For example, as shown in FIG. 15A, the image sensor reference plane 200 is set in advance to a plane parallel to an image sensor 503 (shown in FIG. 17) described later, and the holder 2 is placed on the image sensor reference plane 200. ing. Then, the collimator 201 adjusts the axis O1 of the lens support portion 91 of the lens holding member 9 to be perpendicular to the image sensor reference plane 200.
　また例えば、図１５Ｂに示すように、撮像素子基準面２００は、撮像素子５０３と平行な面に予め設定され、撮像素子基準面２００に載置されたホルダ２は、その撮像素子基準面２００に平行なホルダ用基準面２２１を備えたものとされている。一方、レンズ保持部材９は、下端（一端）に、軸方向（光軸方向）と直交する保持部材用基準面２９１を備えている。レンズ保持部材９が移動体本体部５のレンズ保持部材収納部５４に収納される際に、保持部材用基準面２９１がホルダ用基準面２２１に押し付けられ、これにより、レンズ保持部材９のレンズ支持部９１の軸Ｏ１が撮像素子基準面２００と垂直になるように位置合わせされる。 For example, as illustrated in FIG. 15B, the image sensor reference plane 200 is set in advance to a plane parallel to the image sensor 503, and the holder 2 placed on the image sensor reference plane 200 is placed on the image sensor reference plane 200. A parallel holder reference surface 221 is provided. On the other hand, the lens holding member 9 includes a holding member reference surface 291 orthogonal to the axial direction (optical axis direction) at the lower end (one end). When the lens holding member 9 is stored in the lens holding member storage portion 54 of the movable body main body 5, the holding member reference surface 291 is pressed against the holder reference surface 221, whereby the lens support member 9 supports the lens. Positioning is performed such that the axis O1 of the portion 91 is perpendicular to the image sensor reference plane 200.
　また例えば、図１５Ｃに示すように、撮像素子基準面２００は、撮像素子５０３と平行な面で且つホルダ２の内側に入り込むように形成されている。レンズ保持部材９は、下端に、軸方向と直交する保持部材用基準面２９１を備えている。レンズ保持部材９が移動体４のレンズ保持部材収納部５４に収納される際に、保持部材用基準面２９１が撮像素子基準面２００に押し付けられる。 For example, as shown in FIG. 15C, the image sensor reference surface 200 is a surface parallel to the image sensor 503 and formed so as to enter the inside of the holder 2. The lens holding member 9 includes a holding member reference surface 291 orthogonal to the axial direction at the lower end. When the lens holding member 9 is stored in the lens holding member storage portion 54 of the moving body 4, the holding member reference surface 291 is pressed against the image sensor reference surface 200.
　また例えば、図１５Ｄに示すように、撮像素子基準面２００と平行な面に形成された撮像素子基準平行面２００ａがホルダ２の上方側に配置されている。レンズ保持部材９は、上端（他端）に、軸方向と直交する保持部材用基準面２９２を備えている。レンズ保持部材９が移動体４のレンズ保持部材収納部５４に収納される際に、保持部材用基準面２９２が撮像素子基準平行面２００ａに押し付けられる。 For example, as shown in FIG. 15D, an image sensor reference parallel surface 200 a formed in a plane parallel to the image sensor reference surface 200 is arranged on the upper side of the holder 2. The lens holding member 9 includes a holding member reference surface 292 orthogonal to the axial direction at the upper end (the other end). When the lens holding member 9 is stored in the lens holding member storage portion 54 of the moving body 4, the holding member reference surface 292 is pressed against the imaging element reference parallel surface 200a.
　このようにして、レンズ保持部材９が撮像素子基準面２００に対して位置決めされて収納されることにより、駆動軸３２に摩擦係合された移動体４が撮像素子基準面２００に対する傾きにかかわらずにレンズ保持部材９の軸Ｏ１を撮像素子基準面２００に垂直な垂直線に沿って移動させることができる。 In this manner, the lens holding member 9 is positioned and accommodated with respect to the image sensor reference plane 200, so that the moving body 4 frictionally engaged with the drive shaft 32 is independent of the inclination with respect to the image sensor reference plane 200. In addition, the axis O1 of the lens holding member 9 can be moved along a vertical line perpendicular to the image sensor reference plane 200.
　より詳しくは、例えば図１６Ｂに示す比較例のように、移動体４０４の軸Ｏ３に対してレンズバレル４０７の軸Ｏ１を一致させて取り付けた場合、レンズバレル４０７の軸Ｏ１が、撮像素子基準面２００に垂直な垂直線に対して傾いていると、レンズバレル４０７と撮像素子基準面２００との位置合わせは、通常、移動体４０４と摩擦係合した駆動軸４３２の軸Ｏ２を撮像素子基準面２００に垂直な垂直線に対して傾けることにより、レンズバレル４０７の軸Ｏ１と撮像素子基準面２００に垂直な垂直線とを一致させるように、調整される。この場合、駆動軸４３２の軸Ｏ２が垂直線に対して傾いているため、移動体４０４が駆動軸４３２の軸方向に沿って移動すると、レンズバレル４０７が垂直線に対して所定角度をなした方向に移動してしまう。 More specifically, for example, as in the comparative example shown in FIG. 16B, when the axis O1 of the lens barrel 407 is attached so as to coincide with the axis O3 of the moving body 404, the axis O1 of the lens barrel 407 is the image sensor reference plane. If the lens barrel 407 and the image sensor reference surface 200 are aligned with respect to a vertical line perpendicular to the line 200, the axis O2 of the drive shaft 432 that is frictionally engaged with the moving body 404 is usually set to the image sensor reference surface. By tilting with respect to a vertical line perpendicular to 200, adjustment is made so that the axis O1 of the lens barrel 407 and the vertical line perpendicular to the image sensor reference plane 200 coincide. In this case, since the axis O2 of the drive shaft 432 is inclined with respect to the vertical line, when the moving body 404 moves along the axial direction of the drive shaft 432, the lens barrel 407 makes a predetermined angle with respect to the vertical line. It will move in the direction.
　一方、上記実施形態の場合は、図１６Ａに示すように、駆動軸３２に摩擦係合された移動体４の軸Ｏ３が撮像素子基準面２００に垂直な垂直線に対して所定の角度をなして傾いている場合でも、レンズ保持部材９の軸Ｏ１が垂直線に一致している。そのため、移動体４が駆動軸３２の軸方向に沿って移動すると、移動体４は、垂直線に対して所定角度をなしたまま移動するが、レンズ保持部材９は、垂直線と同方向に移動する。 On the other hand, in the case of the above embodiment, as shown in FIG. 16A, the axis O3 of the moving body 4 frictionally engaged with the drive shaft 32 forms a predetermined angle with respect to a vertical line perpendicular to the image sensor reference plane 200. Even when tilted, the axis O1 of the lens holding member 9 coincides with the vertical line. Therefore, when the moving body 4 moves along the axial direction of the drive shaft 32, the moving body 4 moves with a predetermined angle with respect to the vertical line, but the lens holding member 9 moves in the same direction as the vertical line. Moving.
　以上のようにして、レンズ保持部材９が移動体４のレンズ保持部材収納部５４に収納された後、レンズ保持部材９と移動体４のレンズ保持部材収納部５４との間に形成された隙間９２に、レンズ保持部材用の接着剤９３が充填されて固定されている。なお、レンズ保持部材用の接着剤９３は、特に限定されず、例えば熱硬化型の接着剤が使用可能である。 As described above, the gap formed between the lens holding member 9 and the lens holding member storage portion 54 of the moving body 4 after the lens holding member 9 is stored in the lens holding member storage portion 54 of the moving body 4. 92 is filled and fixed with an adhesive 93 for a lens holding member. The adhesive 93 for the lens holding member is not particularly limited, and for example, a thermosetting adhesive can be used.
　次に、カバー８について、図１、図２に基いて説明する。この実施形態のカバー８は、０．１ｍｍ～０．２ｍｍのステンレス製の薄板を絞り加工、プレス加工により形成されており、上壁８１に光路となる貫通孔８２を備えている。 Next, the cover 8 will be described with reference to FIGS. The cover 8 of this embodiment is formed by drawing and pressing a stainless steel thin plate of 0.1 mm to 0.2 mm, and has a through hole 82 serving as an optical path in the upper wall 81.
　カバー８は、４つの側壁８３のそれぞれに、ホルダ２の側面に設けられた係止用突起２０ｆに係止する係止用孔８４を備えている。なお、この実施形態では、係止用突起２０ｆは、２個であり、対向する２つの係止用孔８４と係止するようになっている。 The cover 8 is provided with a locking hole 84 for locking to a locking projection 20f provided on the side surface of the holder 2 on each of the four side walls 83. In this embodiment, the number of the locking projections 20f is two, and the locking projections 20f are locked with the two locking holes 84 facing each other.
　このカバー８は、ホルダ２の第１支持柱２０ａ、第３支持柱２０ｃおよび第４支持柱２０ｄのそれぞれの上面に設けられた載置台２０ｅ、および、第２支持柱２０ｂの上面に、カバー８の上壁８１の内面とが当接した状態で、係止用孔８４と係止用突起２０ｆとが係止している。 The cover 8 is formed on the mounting table 20e provided on the upper surfaces of the first support column 20a, the third support column 20c, and the fourth support column 20d of the holder 2, and on the upper surface of the second support column 20b. The locking hole 84 and the locking projection 20f are locked in a state where the inner surface of the upper wall 81 is in contact.
　この係止状態で、載置台２０ｅ、および、第２支持柱２０ｂの上面と、カバー８の上壁８１の内面とが、接着剤により接着されて結合される。 In this locked state, the upper surface of the mounting table 20e and the second support pillar 20b and the inner surface of the upper wall 81 of the cover 8 are bonded and bonded with an adhesive.
　以上のように構成された駆動装置１は、例えば図１７に示すようにレンズ保持部材９のレンズ支持部９１にレンズバレル（撮像光学系）７が保持されるとともに、ホルダ２の下面側に、ＩＲカットフィルタ５０２および撮像素子５０３を有するセンサ基板５０４が付設されることで撮像装置５００が形成される。 In the drive device 1 configured as described above, for example, as shown in FIG. 17, the lens barrel (imaging optical system) 7 is held on the lens support portion 91 of the lens holding member 9, and the lower surface side of the holder 2 is An image pickup apparatus 500 is formed by attaching a sensor substrate 504 having an IR cut filter 502 and an image pickup element 503.
　撮像素子５０３は、全体を図示していない撮像光学系によって結像された物体（被写体）の光学像における光量に応じてＲ（赤）、Ｇ（緑）、Ｂ（青）の各成分の画像信号に光電変換して所定の画像処理回路（不図示）へ出力する素子である。撮像素子５０３は、例えば、ＣＣＤ型のイメージセンサや、ＣＭＯＳ型のイメージセンサ等である。 The image sensor 503 is an image of each component of R (red), G (green), and B (blue) in accordance with the amount of light in an optical image of an object (subject) formed by an imaging optical system (not shown) as a whole. It is an element that photoelectrically converts a signal and outputs it to a predetermined image processing circuit (not shown). The image sensor 503 is, for example, a CCD image sensor, a CMOS image sensor, or the like.
　前記撮像光学系は、１または複数のレンズ群（光学素子）７１を備え、物体の光学像を撮像素子５０３の受光面上に結像する。レンズ群７１は、このような撮像光学系における前記１または複数の光学素子のうちの光軸に沿って移動する光学素子である。レンズ群７１は、１枚のレンズであってよく、また複数のレンズを備えるものであってもよい。レンズ群７１は、例えば、フォーカシング（合焦）を行うために光軸に沿って移動するレンズであってよく、また例えば、ズーミング（変倍）を行うために光軸に沿って移動するレンズであってよい。このようなレンズ群７１を備える撮像光学系によって物体の光学像が、撮像光学系によりその光軸に沿って撮像素子５０３の受光面まで導かれ、撮像素子５０３によって前記物体の光学像が撮像される。 The imaging optical system includes one or a plurality of lens groups (optical elements) 71, and forms an optical image of an object on the light receiving surface of the imaging element 503. The lens group 71 is an optical element that moves along the optical axis among the one or more optical elements in such an imaging optical system. The lens group 71 may be a single lens or may include a plurality of lenses. The lens group 71 may be, for example, a lens that moves along the optical axis to perform focusing (focusing), or a lens that moves along the optical axis to perform zooming (magnification), for example. It may be. The optical image of the object is guided by the imaging optical system including the lens group 71 along the optical axis to the light receiving surface of the imaging element 503, and the optical image of the object is captured by the imaging element 503. The
　そして、例えば携帯電話機の回路基板に、第１電極端子２２の外部接続端子２２ｂおよび第２電極端子２３の外部接続端子２３ｂ（図１等参照）が置かれるようにして携帯電話機の筐体内に設置される。 For example, the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b (see FIG. 1 and the like) of the second electrode terminal 23 are placed on the circuit board of the mobile phone in the casing of the mobile phone. Is done.
　そして、駆動回路から第１電極端子２２の外部接続端子２２ｂおよび第２電極端子２３の外部接続端子２３ｂに電力が供給されると、アクチュエータ本体３の圧電素子３１が軸方向に振動してその振動によって駆動軸３２が往復移動し、その往復移動によって移動体４が駆動軸３２の軸方向（光軸方向）に移動する。 When electric power is supplied from the drive circuit to the external connection terminal 22b of the first electrode terminal 22 and the external connection terminal 23b of the second electrode terminal 23, the piezoelectric element 31 of the actuator body 3 vibrates in the axial direction and the vibration occurs. The reciprocating movement of the drive shaft 32 causes the moving body 4 to move in the axial direction of the drive shaft 32 (optical axis direction).
　より詳しくは、圧電素子３１に所定のデューティ比の矩形波が付与されることによって圧電素子３１の変位が三角波状となり、その矩形波のデューティ比を変えることによって振幅の上昇時と下降時とで傾きの異なる三角波が発生する。アクチュエータ本体３の駆動メカニズムは、これを利用するものである。 More specifically, when a rectangular wave having a predetermined duty ratio is applied to the piezoelectric element 31, the displacement of the piezoelectric element 31 becomes a triangular wave, and the amplitude ratio is increased and decreased by changing the duty ratio of the rectangular wave. Triangular waves with different slopes are generated. The drive mechanism of the actuator body 3 utilizes this.
　例えば、駆動軸３２をゆっくりと振動させることで、その駆動軸３２に摩擦係合している移動体４もその振動に応じて移動し、摩擦係合した摩擦力を超える程の瞬時に、駆動軸３２を振動させると、移動体４がそのまま取り残される。このような駆動軸３２の軸方向の振動を繰返し行うことで、移動体４が駆動軸３２の軸方向に移動する。 For example, when the drive shaft 32 is vibrated slowly, the moving body 4 that is frictionally engaged with the drive shaft 32 is also moved in response to the vibration, and the drive is instantaneously performed to exceed the frictionally engaged friction force. When the shaft 32 is vibrated, the moving body 4 is left as it is. By repeatedly performing such vibration in the axial direction of the drive shaft 32, the moving body 4 moves in the axial direction of the drive shaft 32.
　次に、第２実施形態の駆動装置３００について説明する。第２実施形態の駆動装置３００は、図１８に示すように、ホルダ３０２と、アクチュエータ本体３０３と、移動体３０４と、コイルバネ（押圧部材）３０６と、レンズ保持部材３０９とを備えている。 Next, the driving device 300 of the second embodiment will be described. As illustrated in FIG. 18, the driving device 300 according to the second embodiment includes a holder 302, an actuator body 303, a moving body 304, a coil spring (pressing member) 306, and a lens holding member 309.
　ホルダ３０２は、平面視で矩形状を呈しており、第２隅角部３０２ｂと第４隅角部３０２ｄとに、移動体３０４を案内するガイド軸３２１を備えている。 The holder 302 has a rectangular shape in a plan view, and includes a guide shaft 321 for guiding the moving body 304 at the second corner portion 302b and the fourth corner portion 302d.
　アクチュエータ本体３０３は、電気機械変換素子である圧電素子３３１と、圧電素子３３１の一方面３３１ａに接合されて圧電素子３３１から機械エネルギーが伝達される駆動部材としての駆動突部３３２とを備えている。 The actuator body 303 includes a piezoelectric element 331 that is an electromechanical conversion element, and a driving protrusion 332 that is bonded to one surface 331a of the piezoelectric element 331 and that transmits mechanical energy from the piezoelectric element 331. .
　この第２実施形態の圧電素子３３１は、図示しないが、一定の間隔を隔てて形成された第１振動部と第２振動部とを備えたもので、これらの第１振動部と第２振動部とによって、一方面３３１ａが圧電素子３３１への電圧印加に際して楕円運動をするようになっている。 Although not shown, the piezoelectric element 331 of the second embodiment includes a first vibrating portion and a second vibrating portion that are formed at regular intervals, and the first vibrating portion and the second vibrating portion are provided. Depending on the portion, the one surface 331a is elliptically moved when a voltage is applied to the piezoelectric element 331.
　駆動突部３３２は、この第２実施形態では、半球状を呈する２つから構成されている。 In this second embodiment, the drive protrusion 332 is composed of two hemispherical shapes.
　そして、このように構成されたアクチュエータ本体３０３は、ホルダ３０２の第１隅角部３０２ａに、駆動突部３３２が内方を向くように配設されている。 The actuator body 303 configured as described above is arranged at the first corner portion 302a of the holder 302 so that the drive protrusion 332 faces inward.
　移動体３０４は、金属製板状体から円筒状に形成されており、外周部に、周方向に等間隔に配設された２つのガイド軸挿通孔３５１を備えている。そして、これらのガイド軸挿通孔３５１に、ガイド軸３２１が移動可能に挿通されている。また、この状態で、移動体３０４の外周面と駆動突部３３２とが径方向に対向している。 The moving body 304 is formed in a cylindrical shape from a metal plate-like body, and includes two guide shaft insertion holes 351 disposed at equal intervals in the circumferential direction on the outer peripheral portion. The guide shaft 321 is movably inserted through these guide shaft insertion holes 351. In this state, the outer peripheral surface of the moving body 304 and the drive protrusion 332 are opposed to each other in the radial direction.
　コイルバネ３０６は、圧電素子３３１の他方面３３１ｂとホルダ３０２の第１隅角部３０２ａの内面との間に配設され、圧電素子３３１を介して駆動突部３３２を移動体３０４の外周面に押圧している。 The coil spring 306 is disposed between the other surface 331 b of the piezoelectric element 331 and the inner surface of the first corner portion 302 a of the holder 302, and presses the drive protrusion 332 against the outer peripheral surface of the moving body 304 via the piezoelectric element 331. is doing.
　レンズ保持部材３０９は、内周側に雌ネジ部からなるレンズ支持部３９１を備え、このレンズ支持部３９１に、１または複数のレンズを保持するレンズバレルが支持されるようになっている。 The lens holding member 309 includes a lens support portion 391 including a female screw portion on the inner peripheral side, and a lens barrel that holds one or a plurality of lenses is supported on the lens support portion 391.
　レンズ保持部材３０９は、その外径が、コイルバネ３０６の押圧力によって圧電素子３３１および駆動突部３３２を介して外周面が径方向内側に押圧されて変形された状態の移動体３０４における内周の最小径と略同程度に形成されている。 The lens holding member 309 has an outer diameter of the inner periphery of the moving body 304 in a state where the outer peripheral surface is deformed by being pressed radially inward by the pressing force of the coil spring 306 via the piezoelectric element 331 and the driving protrusion 332. It is formed approximately the same as the minimum diameter.
　そして、レンズ保持部材３０９は、先の第１実施形態と同様に、コイルバネ３０６の押圧力によって圧電素子３３１および駆動突部３３２を介して外周面が径方向内側に押圧されて変形された後の状態における移動体３０４の内周側に挿入されている。 As in the first embodiment, the lens holding member 309 is deformed by the outer peripheral surface being pressed radially inward by the pressing force of the coil spring 306 via the piezoelectric element 331 and the driving protrusion 332. It is inserted on the inner peripheral side of the moving body 304 in the state.
　より詳しくは、この第２実施形態では、移動体３０４は、コイルバネ３０６の押圧力によって駆動突部３３２を介して外周面が径方向内側に押圧されると、ガイド軸３２１に当接してその当接部を反力部に変形する。そして、レンズ保持部材３０９は、その変形した後の移動体３０４の内周に挿入されている。 More specifically, in the second embodiment, when the outer peripheral surface is pressed radially inward via the driving protrusion 332 by the pressing force of the coil spring 306, the moving body 304 abuts on the guide shaft 321 and applies the contact. The contact part is transformed into a reaction force part. The lens holding member 309 is inserted into the inner periphery of the movable body 304 after the deformation.
　したがって、この場合も、レンズ保持部材３０９は、移動体３０４の内周側に容易に挿入される。 Therefore, also in this case, the lens holding member 309 is easily inserted into the inner peripheral side of the moving body 304.
　そして、この状態で、レンズ保持部材３０９の外周面と移動体３０４の内周面との間に形成された隙間３９２にレンズ保持部材用の接着剤３９３が充填されて固定されている。 In this state, a lens holding member adhesive 393 is filled and fixed in a gap 392 formed between the outer peripheral surface of the lens holding member 309 and the inner peripheral surface of the moving body 304.
　このように構成された第２実施形態の駆動装置３００は、圧電素子３３１に電圧が印加されると圧電素子３３１の一方面３３１ａが楕円運動を行い、それに伴って駆動突部３３２に押圧されて所定の摩擦力で接触した移動体３０４がガイド軸３２１に沿って移動し、移動体３０４に保持されたレンズ保持部材３０９が移動体３０４と共に同方向に移動する。 In the driving apparatus 300 according to the second embodiment configured as described above, when a voltage is applied to the piezoelectric element 331, the one surface 331a of the piezoelectric element 331 performs an elliptical motion, and the driving protrusion 332 is pressed accordingly. The moving body 304 that has come into contact with the predetermined frictional force moves along the guide shaft 321, and the lens holding member 309 held by the moving body 304 moves in the same direction together with the moving body 304.
　なお、上記実施形態では、レンズ保持部材は、押圧部材の押圧力によって押圧変形された後の状態における移動体の内周側に挿入されたが、この形態のものに限らず、適宜変更できる。 In the above embodiment, the lens holding member is inserted on the inner peripheral side of the moving body in a state after being pressed and deformed by the pressing force of the pressing member.
　例えばレンズ保持部材は、押圧変形される前の状態における移動体の内周側に挿入され、レンズ保持部材が挿入された後に移動体が押圧部材の押圧力によって押圧状態にされ、その後にレンズ保持部材と移動体が接着されてもよい。 For example, the lens holding member is inserted on the inner peripheral side of the moving body before being pressed and deformed, and after the lens holding member is inserted, the moving body is pressed by the pressing force of the pressing member, and then the lens is held. The member and the moving body may be bonded.
　また、上記実施形態では、レンズ保持部材は、内周側に雌ネジ部からなるレンズ支持部を備えたものとされているが、この形態のものに限らず、例えばレンズ保持部材は内周側に接着剤を介してレンズバレルを保持するものでもよい。 In the above-described embodiment, the lens holding member is provided with a lens support portion including an internal thread portion on the inner peripheral side. However, the lens holding member is not limited to this configuration. For example, the lens holding member is on the inner peripheral side. Alternatively, the lens barrel may be held via an adhesive.
　また、上記実施形態では、レンズ保持部材は、レンズバレルを介して１または複数のレンズを保持したが、この形態のものに限らず、例えば１または複数のレンズの外周に雄ネジを形成して、１または複数のレンズを直接保持する形態のものでもよく、或いは１または複数のレンズをレンズ保持部材に直接固定してもよく、適宜変更できる。 Moreover, in the said embodiment, although the lens holding member hold | maintained the 1 or several lens via the lens barrel, it is not restricted to the thing of this form, For example, a male screw is formed in the outer periphery of a 1 or several lens One or a plurality of lenses may be directly held, or one or a plurality of lenses may be directly fixed to the lens holding member, and can be changed as appropriate.
　本明細書は、上記のように様々な態様の技術を開示しているが、そのうち主な技術を以下に纏める。 This specification discloses various modes of technology as described above, and the main technologies are summarized below.
　一態様にかかる駆動装置は、ホルダと、前記ホルダに保持され、電気エネルギーを機械エネルギーに変換する電気機械変換素子と、前記電気機械変換素子に接合され、前記機械エネルギーが伝達される駆動部材と、前記ホルダに対して移動する移動体と、前記移動体に駆動部材を押し付けた押圧部材と、レンズを保持するレンズ保持部材とを備え、前記レンズ保持部材は、その外周と前記移動体の内周との間に隙間が形成されるように、前記移動体の内周側に配設されている。 A driving apparatus according to an aspect includes a holder, an electromechanical conversion element that is held by the holder and converts electrical energy into mechanical energy, and a driving member that is joined to the electromechanical conversion element and to which the mechanical energy is transmitted. A moving body that moves relative to the holder, a pressing member that presses a driving member against the moving body, and a lens holding member that holds a lens. The lens holding member includes an outer periphery thereof and an inner portion of the moving body. It arrange | positions at the inner peripheral side of the said mobile body so that a clearance gap may be formed between the periphery.
　この構成によれば、レンズ保持部材の外周と移動体の内周との間に隙間が形成できるように、レンズ保持部材は、移動体の内周側に配設されている。このため、このような駆動装置は、例えば移動体が押圧部材によって押圧されて変形した後に、レンズ保持部材を移動体の内周側に容易に装着できる。しかも、装着後のレンズ保持部材は、押圧部材による押圧力を受けるおそれが少ない。 According to this configuration, the lens holding member is disposed on the inner peripheral side of the moving body so that a gap can be formed between the outer periphery of the lens holding member and the inner periphery of the moving body. For this reason, such a driving device can easily attach the lens holding member to the inner peripheral side of the moving body after the moving body is pressed and deformed by the pressing member, for example. Moreover, the lens holding member after mounting is less likely to receive a pressing force by the pressing member.
　他の一態様では、上述の駆動装置において、前記移動体は、筒状を呈しており、前記移動体は、その外周に前記駆動部材が押し付けられ、前記レンズ保持部材は、前記押圧部材に押し付けられた状態の前記移動体の内周側に挿入可能に形成されている。 In another aspect, in the above-described driving device, the moving body has a cylindrical shape, the driving body is pressed against the outer periphery of the moving body, and the lens holding member is pressed against the pressing member. It is formed so that it can be inserted in the inner peripheral side of the said mobile body of the state made.
　この構成によれば、レンズ保持部材は、押圧部材に押圧された状態の移動体の内周側に挿入可能に形成されている。このため、このような駆動装置では、移動体が押圧部材に押圧されて変形してもレンズ保持部材が移動体の内周側に容易に配設され得る。しかも、配設後において、押圧部材による押圧力がレンズ保持部材にかかるおそれが少なくできる。 According to this configuration, the lens holding member is formed so as to be insertable on the inner peripheral side of the moving body pressed by the pressing member. For this reason, in such a drive device, the lens holding member can be easily disposed on the inner peripheral side of the moving body even if the moving body is pressed by the pressing member and deformed. In addition, it is possible to reduce the possibility that the pressing force by the pressing member is applied to the lens holding member after the arrangement.
　他の一態様では、これら上述の駆動装置において、前記移動体は、金属製板状体により形成されている。 In another aspect, in the above-described driving device, the moving body is formed of a metal plate-like body.
　この構成によれば、移動体は、同じ外径で大きな内周のものに形成され、効率よく内周側に大径のレンズ保持部材を装着できる。その一方、移動体が変形し易くなるが、移動体が変形してもレンズ保持部材にほとんど影響を及ぼすことがない。したがって、移動体は、本発明に用いられる移動体として好適に適する。 According to this configuration, the movable body is formed to have a large inner circumference with the same outer diameter, and a large-diameter lens holding member can be efficiently mounted on the inner circumference side. On the other hand, the moving body is easily deformed, but even if the moving body is deformed, the lens holding member is hardly affected. Therefore, the moving body is suitable as the moving body used in the present invention.
　他の一態様では、これら上述の駆動装置において、前記駆動部材は、軸状体であり、前記駆動部材の軸方向の一端が、前記電気機械変換素子に接合され、前記移動体は、前記駆動部材に軸方向移動可能に摩擦係合されている。 In another aspect, in the above-described driving devices, the driving member is a shaft-like body, one end in the axial direction of the driving member is joined to the electromechanical transducer, and the moving body is the driving device. The member is frictionally engaged so as to be axially movable.
　この構成によれば、移動体は、駆動部材の軸方向に沿って移動することができる。このため、このような駆動装置は、移動体をガイドするためのガイド軸等を不要にできる。したがって、前記駆動装置は、簡単な構成のものになり、全体の小型化が図られる。 According to this configuration, the moving body can move along the axial direction of the drive member. For this reason, such a drive device can eliminate the need for a guide shaft or the like for guiding the moving body. Therefore, the drive device has a simple configuration, and the overall size can be reduced.
　他の一態様にかかる撮像装置は、これら上述のいずれかの駆動装置と、光学像を電気的な信号に変換する撮像素子と、１または複数の光学素子を備え、物体の光学像を前記撮像素子の受光面上に結像する撮像光学系とを備え、前記撮像光学系における前記１または複数の光学素子のうちの光軸方向に沿って移動する光学素子は、前記駆動装置の前記レンズ保持部材に保持されている。 An imaging apparatus according to another aspect includes any one of the above-described driving apparatuses, an imaging element that converts an optical image into an electrical signal, and one or a plurality of optical elements, and captures an optical image of an object. An imaging optical system that forms an image on a light receiving surface of the element, and the optical element that moves in the optical axis direction among the one or more optical elements in the imaging optical system is the lens holding unit of the driving device. It is held by the member.
　この構成によれば、例えば移動体が押圧部材によって押圧されて変形した後に、レンズ保持部材は、移動体の内周側に容易に装着され得る。しかも、装着後のレンズ保持部材は、押圧部材による押圧力を受けるおそれが少ない。 According to this configuration, for example, after the moving body is pressed and deformed by the pressing member, the lens holding member can be easily mounted on the inner peripheral side of the moving body. Moreover, the lens holding member after mounting is less likely to receive a pressing force by the pressing member.
　この出願は、２０１３年５月１６日に出願された日本国特許出願特願２０１３－１０３９４９を基礎とするものであり、その内容は、本願に含まれるものである。 This application is based on Japanese Patent Application No. 2013-103949 filed on May 16, 2013, the contents of which are included in this application.
　本発明を表現するために、上述において図面を参照しながら実施形態を通して本発明を適切且つ十分に説明したが、当業者であれば上述の実施形態を変更および／または改良することは容易に為し得ることであると認識すべきである。したがって、当業者が実施する変更形態または改良形態が、請求の範囲に記載された請求項の権利範囲を離脱するレベルのものでない限り、当該変更形態または当該改良形態は、当該請求項の権利範囲に包括されると解釈される。 In order to express the present invention, the present invention has been properly and fully described through the embodiments with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Therefore, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.
　本発明によれば、駆動装置および撮像装置を提供することができる。 According to the present invention, a driving device and an imaging device can be provided.

Claims (5)

  1. 　ホルダと、
    　前記ホルダに保持され、電気エネルギーを機械エネルギーに変換する電気機械変換素子と、
    　前記電気機械変換素子に接合され、前記機械エネルギーが伝達される駆動部材と、
    　前記ホルダに対して移動する移動体と、
    　前記移動体に駆動部材を押し付けた押圧部材と、
    　レンズを保持するレンズ保持部材とを備え、
    　前記レンズ保持部材は、その外周と前記移動体の内周との間に隙間が形成されるように、前記移動体の内周側に配設されていること
    　を特徴とする駆動装置。     A holder,
    An electromechanical transducer that is held by the holder and converts electrical energy into mechanical energy;
    A drive member joined to the electromechanical transducer and to which the mechanical energy is transmitted;
    A moving body that moves relative to the holder;
    A pressing member that presses a driving member against the movable body;
    A lens holding member for holding the lens,
    The driving device, wherein the lens holding member is disposed on the inner peripheral side of the moving body so that a gap is formed between the outer periphery of the lens holding member and the inner periphery of the moving body.
  2. 　前記移動体は、筒状を呈しており、
    　前記移動体は、その外周に前記駆動部材が押し付けられ、
    　前記レンズ保持部材は、前記押圧部材に押し付けられた状態の前記移動体の内周側に挿入可能に形成されていること
    　を特徴とする請求項１に記載の駆動装置。     The moving body has a cylindrical shape,
    The movable body is pressed against the outer periphery of the driving member,
    The driving device according to claim 1, wherein the lens holding member is formed so as to be insertable on an inner peripheral side of the movable body pressed against the pressing member.
  3. 　前記移動体は、金属製板状体により形成されていること
    　を特徴とする請求項１または請求項２に記載の駆動装置。     The driving apparatus according to claim 1, wherein the moving body is formed of a metal plate-like body.
  4. 　前記駆動部材は、軸状体であり、前記駆動部材の軸方向の一端が、前記電気機械変換素子に接合され、
    　前記移動体は、前記駆動部材に軸方向移動可能に摩擦係合されていること
    　を特徴とする請求項１ないし請求項３の何れか１項に記載の駆動装置。     The drive member is a shaft-like body, and one end of the drive member in the axial direction is joined to the electromechanical transducer,
    The drive device according to any one of claims 1 to 3, wherein the movable body is frictionally engaged with the drive member so as to be axially movable.
  5. 　請求項１ないし請求項４のいずれか一項に記載の駆動装置と、
    　光学像を電気的な信号に変換する撮像素子と、
    　１または複数の光学素子を備え、物体の光学像を前記撮像素子の受光面上に結像する撮像光学系とを備え、
    　前記撮像光学系における前記１または複数の光学素子のうちの光軸方向に沿って移動する光学素子は、前記駆動装置の前記レンズ保持部材に保持されていること
    　を特徴とする撮像装置。     The drive device according to any one of claims 1 to 4,
    An image sensor that converts an optical image into an electrical signal;
    An imaging optical system that includes one or a plurality of optical elements, and that forms an optical image of an object on a light receiving surface of the imaging element;
    The optical device that moves in the optical axis direction among the one or more optical elements in the imaging optical system is held by the lens holding member of the driving device.
PCT/JP2014/062170 2013-05-16 2014-05-02 Drive device and imaging device WO2014185297A1 (en)

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JP2001255577A (en) * 2000-03-13 2001-09-21 Sony Corp Optical equipment
JP2006311746A (en) * 2005-04-28 2006-11-09 Taiyo Yuden Co Ltd Drive device and its drive method
JP2008152265A (en) * 2006-12-19 2008-07-03 Samsung Electro-Mechanics Co Ltd Lens driving device
JP2010097216A (en) * 2008-10-15 2010-04-30 Samsung Techwin Co Ltd Lens driving unit and camera module comprising the same
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