WO2022163630A1 - レンズ駆動装置及びカメラモジュール - Google Patents

レンズ駆動装置及びカメラモジュール Download PDF

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Publication number
WO2022163630A1
WO2022163630A1 PCT/JP2022/002607 JP2022002607W WO2022163630A1 WO 2022163630 A1 WO2022163630 A1 WO 2022163630A1 JP 2022002607 W JP2022002607 W JP 2022002607W WO 2022163630 A1 WO2022163630 A1 WO 2022163630A1
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WO
WIPO (PCT)
Prior art keywords
shaft
lens holding
holding member
driving device
lens
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/002607
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English (en)
French (fr)
Japanese (ja)
Inventor
克俊 鈴木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Alpine Co Ltd
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 Alps Alpine Co Ltd filed Critical Alps Alpine Co Ltd
Priority to CN202280009580.3A priority Critical patent/CN116710840A/zh
Priority to JP2022578399A priority patent/JP7406014B2/ja
Publication of WO2022163630A1 publication Critical patent/WO2022163630A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Definitions

  • the present disclosure relates to a lens driving device mounted on, for example, a camera-equipped mobile device.
  • lens driving unit capable of moving a lens carrier (lens holding member) in the optical axis direction with respect to a module base (base member) by frictional driving using bending motion of a piezoelectric element.
  • lens driving device capable of moving a lens carrier (lens holding member) in the optical axis direction with respect to a module base (base member) by frictional driving using bending motion of a piezoelectric element.
  • two ball bearing grooves extending in the optical axis direction are formed on the side surface of the lens holding member.
  • Two ball guides for rotatably holding two balls are fixed to the base member. The two balls are configured to be arranged in one ball bearing groove while being spaced apart.
  • the lens holding member held by a total of four balls as described above has a small optical axis. There is a risk of tilting when moving in the axial direction.
  • a lens driving device capable of suppressing inclination of the lens holding member when the lens holding member is moved in the optical axis direction by frictional driving using a piezoelectric element.
  • a lens driving device includes a fixed member, a lens holding member capable of holding a lens body, and guides for guiding the lens holding member so as to be movable in the optical axis direction with respect to the fixed member.
  • a lens driving device comprising: a mechanism; and a piezoelectric drive section having at least a piezoelectric element for moving the lens holding member in the optical axis direction, wherein the lens holding member and the stationary side member are interposed. and a restricting mechanism that suppresses a change in posture when the lens holding member moves in the optical axis direction.
  • the lens driving device described above can suppress the inclination of the lens holding member when the lens holding member is moved in the optical axis direction by frictional driving using the piezoelectric element.
  • FIG. 4 is a perspective view of the lens driving device with the cover member removed; FIG. It is an exploded perspective view of a lens drive.
  • FIG. 4 is a top view of the base member with the link mechanism attached;
  • FIG. 4 is a left side view of the base member with the link mechanism attached;
  • FIG. 11 is a perspective view of the base member with only the second link member attached;
  • 4 is a perspective view of the lens holding member with the link mechanism attached;
  • FIG. 4 is a left side view of the lens holding member with the link mechanism attached;
  • FIG. 4 is a left side view of the lens holding member with the link mechanism attached;
  • FIG. 4 is a left side view of the lens holding member with the link mechanism attached;
  • FIG. 4 is a front view of the lens holding member with the link mechanism attached;
  • FIG. 4 is a front view of the lens holding member with the link mechanism attached;
  • FIG. 4 is a front view of the lens holding member with the link mechanism attached; 4 is a perspective view of the lens driving device with the cover member removed; FIG. 4 is a perspective view of the lens driving device with the cover member removed; FIG. It is a perspective view of a base member.
  • Fig. 3 is a perspective view of a base member with a ball attached;
  • FIG. 4 is an overall perspective view of a base member to which a lens holding member and a ball are attached;
  • FIG. 4 is a perspective view of a portion of the base member;
  • FIG. 4 is an overall perspective view of a lens holding member attached to a base member; It is a perspective view of a part of a lens holding member. It is a perspective view of a lens holding member.
  • FIG. 3 is a perspective view of a base member with a ball attached
  • FIG. 4 is an overall perspective view of a base member to which a lens holding member and a ball are attached
  • FIG. 4 is a perspective view of a portion
  • FIG. 4 is a perspective view of a lens holding member with a ball attached; 4 is a perspective view of the lens driving device with the cover member removed; FIG. FIG. 4 is a partial perspective view of the lens driving device with the cover member removed; It is a perspective view of the whole piezoelectric drive part. 4 is an exploded perspective view of the piezoelectric driving section; FIG. FIG. 4 is a perspective view of a biasing member; It is a front view of a biasing member.
  • FIG. 4 is a top view of a biasing member; It is a left view of a biasing member.
  • FIG. 3 is a perspective view of a biasing member with a piezoelectric drive attached; FIG.
  • FIG. 4 is a front view of a biasing member with a piezoelectric drive attached;
  • FIG. 4 is a top view of a biasing member with a piezoelectric drive attached;
  • Fig. 3 is a left side view of a biasing member with a piezoelectric drive attached;
  • FIG. 4 is a front view of a portion of a biasing member with a piezoelectric drive attached;
  • Fig. 3 is a left side view of a biasing member with a piezoelectric drive attached;
  • FIG. 4 is a perspective view of the entire base member with a biasing member attached; Fig.
  • FIG. 10 is a top view of a portion of the base member with a biasing member attached; It is a perspective view of the whole another example of a structure of a lens drive device.
  • FIG. 11 is a perspective view of another configuration example of the lens driving device with the cover member removed; 17B is an exploded perspective view of the lens driving device shown in FIG. 17A;
  • FIG. 4 is a perspective view of a lens holding member with a pantograph link mechanism attached;
  • FIG. 4 is a left side view of the lens holding member with the pantograph link mechanism attached;
  • FIG. 4 is a left side view of the lens holding member with the pantograph link mechanism attached;
  • FIG. 1A and 1B are perspective views of the lens driving device 101.
  • FIG. 1A is a perspective view of the entire lens driving device 101
  • FIG. 1B is a perspective view of the lens driving device 101 with the cover member 1 removed.
  • FIG. 2 is an exploded perspective view of the lens driving device 101.
  • X1 in FIGS. 1A and 1B represents one direction of the X-axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X-axis.
  • Y1 represents one direction of the Y-axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction.
  • Z1 represents one direction of the Z-axis forming the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z-axis.
  • the X1 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101
  • the X2 side of the lens driving device 101 corresponds to the rear side (back side) of the lens driving device 101. do.
  • the Y1 side of the lens driving device 101 corresponds to the left side of the lens driving device 101, and the Y2 side of the lens driving device 101 corresponds to the right side of the lens driving device 101.
  • FIG. The Z1 side of the lens driving device 101 corresponds to the upper side of the lens driving device 101 , and the Z2 side of the lens driving device 101 corresponds to the lower side of the lens driving device 101 .
  • the lens driving device 101 includes a fixed side member FB and a movable side member MB, as shown in FIG.
  • the fixed side member FB includes a cover member 1 and a base member 7 .
  • the movable side member MB includes a lens holding member 2 and a link mechanism LM.
  • the movable-side member MB is configured to be guided in the optical axis direction by the guide mechanism GM.
  • the optical axis direction includes the direction of the optical axis JD with respect to the lens body and the direction parallel to the optical axis JD. Further, the movable-side member MB is configured to be moved in the optical axis direction by the piezoelectric drive section PD.
  • the cover member 1 is configured to cover the movable side member MB.
  • the cover member 1 is produced by subjecting a metal plate to punching, drawing, and the like.
  • the cover member 1 may be made of another material such as synthetic resin.
  • the cover member 1 includes a rectangular tubular outer peripheral wall portion 1A and a flat plate-shaped and and a rectangular ring-shaped ceiling portion 1B.
  • a circular opening 1K is formed in the central portion of the ceiling portion 1B.
  • the cover member 1 has a box-like outer shape that defines the housing portion 1S, and is configured so that the movable side member MB can be housed in the housing portion 1S.
  • the cover member 1 is joined to the base member 7 with an adhesive, and together with the base member 7 constitutes the housing HS.
  • the lens holding member 2 is configured so that the cylindrical portion 2C can hold a lens body (not shown).
  • the lens holding member 2 is made by injection molding synthetic resin such as liquid crystal polymer (LCP).
  • LCP liquid crystal polymer
  • a lens body is, for example, a cylindrical lens barrel with at least one lens.
  • the link mechanism LM is an example of a regulation mechanism.
  • the regulation mechanism is arranged between the lens holding member 2 and the fixed side member FB, and is a mechanism for suppressing a change in posture when the lens holding member 2 moves in the optical axis direction.
  • a change in the posture of the lens holding member 2 includes, for example, an inclination of the optical axis JD with respect to the Z-axis direction.
  • the link mechanism LM includes a first link member 3 and a second link member 4, and is arranged between the lens holding member 2 and the base member 7 as the fixed side member FB. It is configured to be able to suppress a change in posture when moving in the optical axis direction.
  • the piezoelectric drive unit PD is configured to move the lens holding member 2 along the optical axis direction.
  • the piezoelectric drive PD is an example of a friction drive utilizing the drive system disclosed in U.S. Pat. include.
  • the piezoelectric element 8 is configured to be able to realize bending vibration according to the applied voltage.
  • the piezoelectric element 8 extends in the Y-axis direction perpendicular to the optical axis direction (the direction perpendicular to the optical axis JD), and can realize bending vibration having two nodes.
  • the piezoelectric element 8 has a two-layer structure composed of a first layer for realizing a first bending vibration on the XY plane and a second layer for realizing a second bending vibration on the YZ plane.
  • the piezoelectric driving part PD applies voltage to the piezoelectric elements forming the first layer and applying voltage to the piezoelectric elements forming the second layer separately at appropriate timings, so that the midpoint of the piezoelectric element 8 is
  • the trajectory drawn by can be a circular trajectory centered on the rotation axis 8X.
  • the rotation axis 8X is parallel to the Y-axis.
  • Piezoelectric drive unit PD can switch the moving direction (rotating direction) of the middle point following the circular orbit between clockwise and counterclockwise when viewed from the Y1 side by applying voltage at appropriate timing. can.
  • the lens holding member 2 is moved upward (Z1 direction) when the rotating direction of the midpoint of the piezoelectric element 8 is clockwise, and downward (Z2 direction) when the rotating direction of the midpoint of the piezoelectric element 8 is counterclockwise. direction).
  • the midpoint of the piezoelectric element 8 is the point where the amplitude of the first bending vibration is maximum (the point corresponding to the antinode of the first bending vibration) and the point where the amplitude of the second bending vibration is maximum (the second point corresponding to the antinode of bending vibration).
  • the piezoelectric element 8 in the present embodiment is configured so as to realize vibration (circular motion) such that its midpoint draws a circle.
  • the circle (orbit) drawn by the midpoint of the piezoelectric element 8 may not be a perfect circle (perfect circle), but may have a substantially circular shape.
  • the contact member 9 is attached to the piezoelectric element 8 and configured to come into contact with the lens holding member 2 .
  • the contact member 9 is bonded to the inner surface of the piezoelectric element 8 with an adhesive so as to cover the entire inner surface (the side facing the optical axis JD) of the piezoelectric element 8 .
  • the contact member 9 is made of metal such as stainless steel, and is configured to perform bending vibration according to the bending vibration of the piezoelectric element 8 .
  • the contact member 9 is a friction plate made of stainless steel.
  • the contact member 9 extends in the same Y-axis direction as the piezoelectric element 8 extends.
  • the contact member 9 is configured such that the central portion in the extending direction contacts the receiving member 11 attached to the lens holding member 2 . Specifically, the contact member 9 is configured to contact the receiving member 11 at a point (an antinode portion of the bending vibration) where the amplitude of the bending vibration is maximum.
  • the receiving member 11 is made of metal such as stainless steel. In this embodiment, the receiving member 11 is a cylindrical pin made of stainless steel and extending in the optical axis direction. The reason why the metal contact member 9 and the metal receiving member 11 are brought into contact is to prevent wear of the lens holding member 2 due to contact between the synthetic resin lens holding member 2 and the metal contact member 9 . be. Note that the length dimension of the contact member 9 in the Y-axis direction does not have to be the same as that of the piezoelectric element 8 as long as contact between the contact member 9 and the receiving member 11 can be obtained.
  • the circuit board 10 is a board that includes a conductive pattern, and is configured so that an external power source and the piezoelectric element 8 can be electrically connected.
  • the circuit board 10 is a flexible printed board having flexibility, and is configured to apply a voltage to the piezoelectric element 8 .
  • the piezoelectric element 8 is bonded to the inner surface (the side facing the optical axis JD) of the circuit board 10 with an anisotropic conductive adhesive.
  • the piezoelectric element 8 may be bonded inside the circuit board 10 with an anisotropic conductive adhesive film.
  • the piezoelectric drive part PD is configured to be biased inwardly (in a direction approaching the optical axis JD) by a biasing member 6 fixed to the base member 7 and pressed against the lens holding member 2 .
  • the biasing member 6 is formed of a metal plate, and is positioned outside the piezoelectric element 8 (far from the optical axis JD) at portions corresponding to two nodes formed when the piezoelectric element 8 undergoes bending vibration. side) and the circuit board 10 are in contact with each other.
  • the bonding between the urging member 6 and the piezoelectric driving part PD is achieved by, for example, an adhesive.
  • the guide mechanism GM is configured to be able to guide the lens holding member 2 movably in the optical axis direction with respect to the fixed side member FB.
  • the guide mechanism GM includes a movable groove portion 2G formed in the columnar portion 2B of the lens holding member 2, a fixed groove portion 7G formed in the columnar portion 7B of the base member 7, and a movable groove portion 2G. and a ball 5 sandwiched between the fixed side groove portion 7G.
  • the columnar portion 2B of the lens holding member 2 includes a left columnar portion 2BL and a right columnar portion 2BR
  • the movable groove portion 2G includes a left movable groove portion 2GL and a right columnar portion 2BR formed in the left columnar portion 2BL. It includes a right movable side groove portion 2GR formed in.
  • the guide mechanism GM has two guide portions (a right guide portion GMR and a left guide portion GML) arranged to face each other with the receiving member 11 attached to the lens holding member 2 interposed therebetween.
  • the right guide portion GMR includes a right movable groove portion 2GR formed in the right columnar portion 2BR of the lens holding member 2, a right fixed groove portion 7GR formed in the right columnar portion 7BR of the base member 7, and a right movable groove portion 2GR. and a right side ball 5R arranged between the right fixed side groove portion 7GR.
  • the right ball 5R includes an upper right ball 5RU and a lower right ball 5RD.
  • the left guide portion GML includes a left movable groove portion 2GL formed in the left columnar portion 2BL of the lens holding member 2, a left fixed groove portion 7GL formed in the left columnar portion 7BL of the base member 7, and a left movable groove portion 2GL. and the left side ball 5L disposed between the left fixed side groove portion 7GL.
  • the left ball 5L includes an upper left ball 5LU and a lower left ball 5LD.
  • the base member 7 is manufactured by injection molding using synthetic resin such as liquid crystal polymer.
  • the base member 7 has a substantially rectangular plate-like outer shape, and a circular opening 7K is formed in the center.
  • the subject-side (Z1 side) surface (upper surface) of the base member 7 there are provided two rectangular convex columnar portions 7B projecting upward and one rectangular convex wall portion 7W.
  • Two corners on the front side of the base member 7 are formed with holding portions 7C that protrude upward, and two corners on the rear side of the base member 7 are formed with third grip portions that protrude upward.
  • a shaft support portion 7H is formed.
  • the clamping portion 7C is a portion configured to clamp the biasing member 6, and includes a left clamping portion 7CL and a right clamping portion 7CR.
  • the third shaft support portion 7H is a portion configured to support the third shaft portion 3S of the first link member 3, and includes a left third shaft support portion 7HL and a right third shaft support portion 7HR. Further, at the left front corner and the left rear corner of the base member 7, as shown in FIG. 3C, a fourth shaft supporting portion 7J is formed.
  • the fourth shaft support portion 7J is a portion configured so that at least the right side (Y2 side) is open so as to support the fourth shaft portion 4S of the second link member 4. Includes 4-axis support 7JB.
  • a sensor 12 is attached to the wall portion 7W of the base member 7. Specifically, a sensor 12 mounted on a sensor circuit board (not shown) is attached to the rear surface (X2 side surface) of the wall portion 7W so as to face the magnet 13 attached to the lens holding member 2. ing.
  • the sensor 12 is configured to detect the position of the movable side member MB.
  • the sensor 12 is composed of a Hall element, measures an output voltage that changes according to the magnitude of the magnetic field generated by the magnet 13 received by the sensor 12, and measures the output voltage of the movable side member MB (lens holding member 2 ) is configured to detect the position of
  • the sensor 12 may be a Giant Magneto Resistive effect (GMR) element, a Semiconductor Magneto Resistive (SMR) element, an Anisotropic Magneto Resistive (AMR) element, or a tunnel magnetoresistance (Tunnel Magneto Resistive: TMR) element or other magnetoresistive element may be used to detect the position of the movable side member MB.
  • GMR Giant Magneto Resistive effect
  • SMR Semiconductor Magneto Resistive
  • AMR Anisotropic Magneto Resistive
  • TMR tunnel magnetoresistance
  • the lens driving device 101 has a substantially rectangular parallelepiped outer shape and is mounted on a substrate (not shown) on which an imaging device (not shown) is mounted.
  • the substrate, the lens driving device 101, the lens body (not shown) attached to the lens holding member 2, and the imaging device mounted on the substrate so as to face the lens body constitute a camera module.
  • the piezoelectric element 8 is connected to an external power source via the circuit board 10 . When a voltage is applied to the piezoelectric element 8, the piezoelectric element 8 performs a first bending vibration and a second bending motion, and generates force to move the lens holding member 2 along the optical axis direction. This force is a friction force associated with contact between the receiving member 11 attached to the lens holding member 2 and the contact member 9 joined to the piezoelectric element 8 .
  • the lens driving device 101 utilizes this force to move the lens holding member 2 along the optical axis direction on the Z1 side (object side) of the imaging element, thereby realizing an automatic focus adjustment function. Specifically, the lens driving device 101 moves the lens holding member 2 away from the image pickup device to enable macro photography, and moves the lens holding member 2 toward the image pickup device to enable infinity photography. I have to.
  • FIGS. 3A to 3C are views of the base member 7 with the link mechanism LM attached.
  • FIG. 3A is a top view of the base member 7 with the link mechanism LM attached
  • FIG. 3B is a left side view of the base member 7 with the link mechanism LM attached
  • FIG. 3C is a perspective view of the base member 7 with only the second link member 4 attached.
  • 3A to 3C all show the state when the lens holding member 2 movable in the optical axis direction is positioned at the lowest side (Z2 side).
  • FIG. 4A to 4C, 5A, and 5B are diagrams of the lens holding member 2 with the link mechanism LM attached.
  • FIG. 4A is a perspective view of the lens holding member 2 with the link mechanism LM attached
  • FIGS. 4B and 4C are left side views of the lens holding member 2 with the link mechanism LM attached.
  • 5A and 5B are front views of the lens holding member 2 with the link mechanism LM attached.
  • 4A and 4B show the state when the lens holding member 2 is positioned at the lowermost side (Z2 side)
  • FIG. 4C shows the state when the lens holding member 2 is positioned at the uppermost side (Z1 side). show the situation.
  • 5A shows the state when the lens holding member 2 is positioned at the lowest side (Z2 side)
  • FIG. 5B shows the state when the lens holding member 2 is positioned at the highest side (Z1 side). .
  • the link mechanism LM has a first link member 3 and a second link member 4.
  • the first link member 3 and the second link member 4 are made by injection molding synthetic resin such as liquid crystal polymer (LCP).
  • the first link member 3 is connected to the lens holding member 2 so as to be rotatable about the first rotation axis RA1, and the second link member 4 is rotatable about the second rotation axis RA2. It is connected to the lens holding member 2 so that it becomes.
  • the first link member 3 is connected to the base member 7 so as to be rotatable about a third rotation axis RA3, and the second link member 4 is rotatable about a fourth rotation axis RA4. It is connected to the base member 7 so as to be possible.
  • the first rotation axis RA1 and the third rotation axis RA3 are arranged parallel to each other, and the second rotation axis RA2 and the fourth rotation axis RA4 are arranged parallel to each other.
  • each of the first rotation axis RA1 and the third rotation axis RA3 and each of the second rotation axis RA2 and the fourth rotation axis RA4 are orthogonal to each other. are placed.
  • the first rotation axis RA1 and the second rotation axis RA2 are arranged so as to be orthogonal to each other at the position of the optical axis JD, and the third rotation axis
  • the RA3 and the fourth rotation shaft RA4 are arranged so as to be perpendicular to each other at the left rear corner of the base member 7 .
  • the first rotation axis RA1 and the second rotation axis RA2 are orthogonal to the optical axis direction.
  • the lens holding member 2 includes a pair of first shaft portions 2S (a left first shaft portion 2SL and a right first shaft portion 2SR) and a pair of second shaft portions. 2T (front second shaft portion 2TF and rear second shaft portion 2TB).
  • the first link member 3 is formed with a pair of third shaft portions 3S (left third shaft portion 3SL and right third shaft portion 3SR) rotatably supported by the base member 7. and a pair of first arm portions 3A (left first arm portion 3AL and right first arm portion 3AR) connected to the first base portion 3B and facing each other.
  • a first shaft support portion 3H (a left first shaft support portion 3HL and a right first shaft support portion 3HR) is formed at the tip of each of the pair of first arm portions 3A.
  • the left first shaft support portion 3HL supports the left first shaft portion 2SL formed on the lens holding member 2
  • the right first shaft support portion 3HR supports the right side shaft portion formed on the lens holding member 2.
  • the left third shaft portion 3SL is supported by a left third shaft support portion 7HL formed at the left rear corner of the base member 7, and the right third shaft portion 3SR is supported by the base member 7.
  • the member 7 is supported by a right third pivot portion 7HR formed at a right rear corner portion.
  • the second link member 4 is formed with a pair of fourth shaft portions 4S (fourth front shaft portion 4SF and fourth rear shaft portion 4SB) rotatably supported by the base member 7. and a pair of second arms 4A (front second arm 4AF and rear second arm 4AB) connected to the second base 4B and facing each other.
  • a second shaft support portion 4H (a front side second shaft support portion 4HF and a rear side second shaft support portion 4HB) is formed at the tip of each of the pair of second arm portions 4A.
  • the front second shaft portion 4HF supports the front second shaft portion 2TF (see FIG. 8A) formed on the lens holding member 2
  • the rear second shaft portion 4HB supports the rear second shaft portion 4HB formed on the lens holding member 2.
  • the front fourth shaft portion 4SF is supported by a front fourth shaft support portion 7JF formed at the left front corner of the base member 7, and the rear fourth shaft portion 4SB is supported by the base member 7. It is supported by a rear fourth pivotal support portion 7JB formed at the left rear corner of the member 7 .
  • the lens holding member 2 and the first link member 3 are connected via the first shaft portion 2S and the first shaft support portion 3H, and the lens holding member 2 and the second link member 4 are connected by They are connected via the two shaft portions 2T and the second shaft support portion 4H.
  • the first shaft support portion 3H has a U-shaped first concave portion UR1 with an open front side (X1 side).
  • the first shaft portion 2S is located inside the first recess portion UR1 and is configured such that a gap D1 can be formed between the inner bottom surface of the first recess portion UR1 and the first shaft portion 2S.
  • the second shaft supporting portion 4H has a U-shaped second concave portion UR2 that is open on the right side (Y2 side).
  • the second shaft portion 2T is located inside the second recess portion UR2, and is configured such that a gap D2 can be formed between the inner bottom surface of the second recess portion UR2 and the second shaft portion 2T.
  • the link mechanism LM is configured such that the sizes of the gaps D1 and D2 change when the lens holding member 2 moves along the optical axis direction. This is to prevent the posture of the lens holding member 2 from changing when the lens holding member 2 moves along the optical axis direction.
  • the link mechanism LM is configured such that the size of the gap D1 becomes smaller when the lens holding member 2 moves upward (Z1 direction).
  • the link mechanism LM is configured such that the size of the gap D2 becomes smaller when the lens holding member 2 moves upward (Z1 direction).
  • FIGS. 6A, 6B, 7A, 7B, 8A, 8B, 9A, 9B, 10A, and 10B are perspective views of the lens driving device 101 with the cover member 1 removed. Specifically, FIG. 6A shows the state when the lens holding member 2 is positioned at the lowermost side (Z2 side), and FIG. 6B shows the state when the lens holding member 2 is positioned at the uppermost side (Z1 side). show the situation. 7A and 7B are perspective views of the entire base member 7. FIG. Specifically, FIG. 7A shows a state in which the ball 5 is not installed in the stationary groove 7G formed in the columnar portion 7B of the base member 7, and FIG.
  • FIG. 8A and 8B are front perspective views of the guide mechanism GM.
  • FIG. 8A is an overall perspective view of the base member 7 to which the lens holding member 2 and the ball 5 are attached.
  • FIG. 8B is an enlarged view of range R1 surrounded by a dashed line shown in FIG. 8A.
  • illustration of members other than the base member 7 is omitted for clarity.
  • 9A and 9B are rear perspective views of the guide mechanism GM.
  • FIG. 9A is a perspective view of the entire lens holding member 2 attached to the base member 7.
  • FIG. 9B is an enlarged view of range R2 surrounded by a dashed line shown in FIG. 9A.
  • FIG. 9A is a perspective view of the entire lens holding member 2 attached to the base member 7.
  • FIG. 9B is an enlarged view of range R2 surrounded by a dashed line shown in FIG. 9A.
  • FIG. 9A is a perspective view of the entire lens holding member 2 attached to the base member 7.
  • FIG. 10A shows a state in which the ball 5 is not installed in the movable groove portion 2G formed in the columnar portion 2B of the lens holding member 2, and FIG. is installed.
  • the guide mechanism GM has a receiving member in the left-right direction (Y-axis direction). It includes a right guide portion GMR and a left guide portion GML that are arranged to face each other with the 11 therebetween.
  • the right guide portion GMR faces the right movable groove portion 2GR (see FIG. 10A) provided in the right columnar portion 2BR of the lens holding member 2 and the right movable groove portion 2GR provided in the base member 7. and a right ball 5R (see FIG. 7B) disposed between the right movable groove 2GR and the right fixed groove 7GR.
  • the right fixed groove 7GR is divided into two recesses 7V as shown in FIG. 7A.
  • the recess 7V includes an upper right recess 7VRU and a lower right recess 7VRD.
  • the right ball 5R includes an upper right ball 5RU accommodated in the upper right recess 7VRU and a lower right ball 5RD accommodated in the lower right recess 7VRD.
  • the right movable groove portion 2GR is not divided into two recesses and extends continuously in the optical axis direction (Z-axis direction).
  • the upper right ball 5RU and the lower right ball 5RD do not approach each other and are maintained at a predetermined distance even when the lens holding member 2 moves along the optical axis direction. be. This is because the movement of the upper right ball 5RU and the lower right ball 5RD in the optical axis direction is restricted by the upper right recess 7VRU and the lower right recess 7VRD.
  • the left guide portion GML includes a left movable groove portion 2GL (see FIG. 10A) provided in the left columnar portion 2BL of the lens holding member 2 and a left movable groove portion 2GL provided in the base member 7 and facing the left movable groove portion 2GL. It has a fixed groove portion 7GL (see FIG. 7A) and a left ball 5L (see FIG. 7B) arranged between the left movable groove portion 2GL and the left fixed groove portion 7GL.
  • the left fixed groove 7GL is divided into two recesses 7V as shown in FIG. 8B.
  • the recess 7V includes an upper left recess 7VLU and a lower left recess 7VLD.
  • the left ball 5L includes an upper left ball 5LU accommodated in the upper left recess 7VLU and a left lower ball 5LD accommodated in the left lower recess 7VLD.
  • the left movable side groove portion 2GL is not divided into two concave portions and extends continuously in the optical axis direction (Z-axis direction).
  • the upper left ball 5LU and the lower left ball 5LD do not come close to each other even when the lens holding member 2 moves along the optical axis, leaving a predetermined gap as shown in FIG. 10B. maintained as it was. This is because the left upper ball 5LU and the left lower ball 5LD are restricted in movement in the optical axis direction by the upper left concave portion 7VLU and the left lower concave portion 7VLD.
  • the lens driving device 101 can smoothly move the lens holding member 2 along the optical axis direction. Further, by providing the link mechanism LM as described above, the lens driving device 101 can prevent the lens holding member 2 from tilting when the lens holding member 2 moves along the optical axis direction. .
  • FIGS. 11A, 11B, 12A, 12B, 13A to 13D, 14A to 14D, 15A, 15B, 16A, and 16B details of the piezoelectric drive section PD will be described.
  • 11A and 11B are perspective views of the lens driving device 101 with the cover member 1 removed.
  • FIG. 11A is a perspective view of the lens driving device 101 with the piezoelectric driving section PD and the biasing member 6 further removed.
  • FIG. 11B is an enlarged view of range R3 surrounded by a dashed line shown in FIG. 11A.
  • 12A and 12B are perspective views of the piezoelectric driver PD.
  • FIG. 12A is a perspective view of the entire piezoelectric drive section PD
  • FIG. 12B is an exploded perspective view of the piezoelectric drive section PD
  • 13A-13D are detailed views of the biasing member 6.
  • FIG. 13A is a perspective view of the biasing member 6
  • FIG. 13B is a front view of the biasing member 6
  • FIG. 13C is a top view of the biasing member 6
  • FIG. 6 is a left side view of FIG. 14A-14D are detailed views of the biasing member 6 to which the piezoelectric drive PD is attached, and correspond to FIGS. 13A-13D
  • FIG. 14A is a perspective view of the biasing member 6 to which the piezoelectric drive part PD is attached, and corresponds to FIG.
  • FIG. 14B is a front view of the biasing member 6 to which the piezoelectric drive part PD is attached, and corresponds to FIG. 13B.
  • FIG. 14C is a top view of the biasing member 6 to which the piezoelectric drive part PD is attached, and corresponds to FIG. 13C.
  • FIG. 14D is a left side view of the biasing member 6 to which the piezoelectric drive part PD is attached, and corresponds to FIG. 13D.
  • 15A and 15B are views of the biasing member 6 to which the piezoelectric drive PD is attached via the adhesive AD. Specifically, FIG. 15A is an enlarged view of range R4 surrounded by broken lines shown in FIG. 14B.
  • FIG. 15A is an enlarged view of range R4 surrounded by broken lines shown in FIG. 14B.
  • FIG. 15B is a left side view of the biasing member 6 to which the piezoelectric driving part PD is attached via the adhesive AD, and corresponds to FIGS. 13D and 14D.
  • 16A and 16B are views of the base member 7 with the biasing member 6 attached. Specifically, FIG. 16A is an overall perspective view of the base member 7 to which the biasing member 6 is attached.
  • FIG. 16B is an enlarged top view of range R5 surrounded by broken lines shown in FIG. 16A.
  • the biasing member 6 is configured by a leaf spring member. Specifically, as shown in FIGS. 13A to 13D, the biasing member 6 includes a fixed portion 6F fixed to the base member 7, a support portion 6S supporting the piezoelectric drive portion PD, and a fixed portion 6F and a supporting portion 6F. and an elastically deformable elastically deformable portion 6E provided between the portion 6S.
  • the fixing part 6F includes a left fixing part 6FL and a right fixing part 6FR
  • the support part 6S includes a left support part 6SL and a right support part 6SR.
  • the left elastic deformation portion 6EL is provided between the left fixing portion 6FL and the left support portion 6SL
  • the right elastic deformation portion 6EL is provided between the right fixing portion 6FR and the right support portion 6SR. and part 6ER.
  • the support portion 6S has a plate-like base portion 6B connected to the elastic deformation portion 6E, and a bent portion 6N that is bent in an L shape from the base portion 6B and protrudes toward the side (X2 side) where the lens holding member 2 is positioned.
  • a concave portion RS (see FIG. 13D) is formed at the tip of the bent portion 6N.
  • the recess RS is a recess that is open on the side where the lens holding member 2 is located.
  • the base 6B includes a left base 6BL that is part of the left support 6SL and a right base 6BR that is part of the right support 6SR.
  • the bent portion 6N includes a left bent portion 6NL that is part of the left support portion 6SL and a right bent portion 6NR that is part of the right support portion 6SR.
  • the recesses RS are formed in the same shape and size at the respective ends of the left bent portion 6NL and the right bent portion 6NR.
  • the piezoelectric drive portion PD is partially positioned within the recess RS and is in contact with the inner edge portion BE of the recess RS. It is fixed at 6N.
  • a gap is shown between the bent portion 6N and the piezoelectric drive portion PD (circuit board 10). It is in contact with the part PD (circuit board 10).
  • the recess RS has an upper edge UE and a lower edge DE facing each other across the inner edge BE.
  • the piezoelectric drive part PD is arranged between the upper edge UE and the lower edge DE.
  • the position at which the inner edge portion BE of the recess RS contacts the piezoelectric drive part PD corresponds to the node position ND of the piezoelectric drive part PD that realizes bending vibration, as shown in FIG. 12A.
  • the node positions ND include a first position ND1 and a second position ND2. In FIG. 12A, the node positions ND are marked with a cross pattern for clarity.
  • the position at which the inner edge portion BE of the recess RS contacts the piezoelectric drive portion PD corresponds to a position at a predetermined distance from the end of the piezoelectric drive portion PD.
  • the predetermined distance is, for example, approximately a quarter of the total length of the piezoelectric drive part PD. That is, the first position ND1, which is one of the positions where the inner edge portion BE of the recess RS and the piezoelectric driving portion PD contact each other, is located at the distance DX1 from the left end portion LE of the piezoelectric driving portion PD.
  • the distance DX1 is approximately one quarter of the total length (length in the Y-axis direction) of the piezoelectric drive section PD.
  • the second position ND2 which is another one of the positions where the inner edge portion BE of the recess RS and the piezoelectric driving portion PD contact each other, is located at a distance DX2 from the right end portion RE of the piezoelectric driving portion PD. .
  • the distance DX2 is approximately a quarter of the total length of the piezoelectric drive section PD.
  • the piezoelectric drive part PD and the bent part 6N are fixed with an adhesive AD, as shown in FIGS. 15A and 15B.
  • the adhesive AD is an ultraviolet curable adhesive.
  • the adhesive AD may be other types of adhesive such as moisture-curing or heat-curing.
  • the adhesive AD adheres between one surface of the bent portion 6N and the piezoelectric drive portion PD and between the other surface of the bent portion 6N and the piezoelectric drive portion PD.
  • the adhesive AD is applied to the first position ND1 and the second position ND2 on the surface of the front side (X1 side) of the circuit board 10, as shown in FIG. 12A. That is, the adhesive AD includes the adhesive AD applied to the first position ND1 and the adhesive AD applied to the second position ND2. Further, the biasing member 6 is pressed against the front surface of the circuit board 10 so that the adhesive AD applied to the front surface of the circuit board 10 is crushed by the concave portion RS provided at the tip of the bent portion 6N.
  • the adhesive AD applied to the first position ND1 is the adhesive AD1L that adheres between the left side surface of the left bent portion 6NL and the piezoelectric drive portion PD, and the adhesive AD1L that adheres between the left bent portion 6NL and the left bent portion 6NL and the adhesive AD1R that adheres between the right side surface of and the piezoelectric drive part PD.
  • the adhesive AD applied to the second position ND2 includes an adhesive AD2L that adheres between the left side surface of the right bent portion 6NR and the piezoelectric drive portion PD, and an adhesive AD2L that adheres between the right side surface of the right bent portion 6NR and the piezoelectric drive portion. It is divided into the adhesive AD2R that adheres between the PD.
  • the two elastic deformation portions 6E extend away from the corresponding base portion 6B.
  • the left elastic deformation portion 6EL extends leftward (Y1 direction) from the left base portion 6BL
  • the right elastic deformation portion 6ER extends rightward (Y2 direction) from the right base portion 6BR.
  • the extending direction of the elastic deformation portion 6E is along the Y-axis direction, which is the extending direction of the piezoelectric element 8, as shown in FIG. 14C.
  • a fixed portion 6F is provided on the extension line of the elastic deformation portion 6E.
  • the fixed portion 6F is sandwiched by a sandwiching portion 7C provided on the base member 7, as shown in FIG. 16B.
  • the holding portion 7C includes a columnar protrusion PL extending upward (in the Z1 direction) from the upper surface of the base member 7, and an L-shaped corner wall portion formed at a corner portion of the base member 7 in plan view.
  • the fixing portion 6F of the biasing member 6 is fitted between the projection PL and the corner wall portion CN from above, thereby being sandwiched between the projection PL and the corner wall portion CN.
  • the clamping of the fixing portion 6F by the clamping portion 7C may be realized by an adhesive or may be reinforced by the adhesive.
  • an opening 6H is formed in the base portion 6B of the biasing member 6, as shown in FIGS. 13A and 13B.
  • the opening 6H includes a left opening 6HL formed in the left base portion 6BL of the left support portion 6SL and a right opening 6HR formed in the right base portion 6BR of the right support portion 6SR.
  • the left opening 6HL is formed so that the connection state between the left bent portion 6NL and the piezoelectric driving portion PD can be visually recognized from the front side (X1 side).
  • the connection state is, for example, whether or not the adhesive AD1L is properly arranged.
  • the right opening 6HR is formed so that the connection state between the right bent portion 6NR and the piezoelectric driving portion PD can be visually recognized from the front side (X1 side).
  • the connection state is, for example, whether or not the adhesive AD2R is properly arranged.
  • the biasing member 6 has a connecting portion 6C that connects two base portions 6B. Specifically, as shown in FIGS. 13A and 13B, the biasing member 6 has an upper connecting portion 6CU and a lower connecting portion 6CD that connect the left base portion 6BL and the right base portion 6BR.
  • FIGS. 17A, 17B, 18, and 19A to 19C are perspective views of the lens driving device 101A.
  • FIG. 17A is a perspective view of the entire lens driving device 101A
  • FIG. 17B is a perspective view of the lens driving device 101A with the cover member 1 removed.
  • FIG. 18 is an exploded perspective view of the lens driving device 101A.
  • the lens driving device 101A mainly differs from the lens driving device 101 having the non-pantograph type link mechanism LM in that it includes the pantograph type link mechanism PLM, but is common to the lens driving device 101 in other respects. Therefore, the description of the common parts will be omitted, and the different parts will be explained in detail below.
  • FIGS. 19A to 19C are diagrams of the lens holding member 20 with the pantograph link mechanism PLM attached.
  • FIG. 19A is a perspective view of the lens holding member 20 with the pantograph link mechanism PLM attached
  • FIGS. 19B and 19C are lens holding members with the pantograph link mechanism PLM attached.
  • 3 is a left side view of member 20.
  • FIG. 19A and 19B show the state when the lens holding member 20 is positioned at the lowermost side (Z2 side)
  • FIG. 19C shows the state when the lens holding member 20 is positioned at the uppermost side (Z1 side). show the situation.
  • the lens driving device 101A includes a fixed side member FB and a movable side member MB, as shown in FIG.
  • the fixed side member FB includes a cover member 1 and a base member 70 .
  • the movable side member MB includes a lens holding member 20 and a pantograph type link mechanism PLM.
  • the movable-side member MB is configured to be guided in the optical axis direction by the guide mechanism GM.
  • the optical axis direction includes the direction of the optical axis JD with respect to the lens body and the direction parallel to the optical axis JD. Further, the movable-side member MB is configured to be moved in the optical axis direction by the piezoelectric drive section PD.
  • the lens holding member 20 is configured to hold a lens body (not shown).
  • the lens holding member 20 is made by injection molding synthetic resin such as liquid crystal polymer (LCP).
  • the pantograph link mechanism PLM is another example of a regulation mechanism.
  • the pantograph-type link mechanism PLM includes a first link member 30 and a second link member 40.
  • the pantograph type link mechanism PLM is arranged between the lens holding member 20 and the base member 70, and is configured to suppress a change in posture when the lens holding member 20 moves in the optical axis direction.
  • the first link member 30 and the second link member 40 are made by injection molding synthetic resin such as liquid crystal polymer (LCP).
  • LCP liquid crystal polymer
  • the first link member 30 is connected to the lens holding member 20 so as to be rotatable around the first rotation axis RX1
  • the second link member 40 is It is connected to the lens holding member 20 so as to be rotatable around the second rotating shaft RX2.
  • the first link member 30 is connected to the base member 70 so as to be rotatable about the third rotation axis RX3, and the second link member 40 is rotatable about the fourth rotation axis RX4. It is operably connected to the base member 70 .
  • first link member 30 and the second link member 40 are connected to each other so as to be rotatable about the fifth rotation axis RX5.
  • the first rotation axis RX1, the second rotation axis RX2, the third rotation axis RX3, the fourth rotation axis RX4, and the fifth rotation axis RX5 are arranged parallel to each other, It is orthogonal to the optical axis direction.
  • the first link member 30 and the lens holding member 20 are connected via the first shaft portion 30SB and the first shaft support portion 20HB.
  • the first shaft portion 30SB includes a left first shaft portion 30SBL and a right first shaft portion 30SBR
  • the first shaft support portion 20HB includes a left first shaft support portion 20HBL and a right first shaft support portion 20HBR.
  • the left first shaft portion 30SBL is supported by the left first shaft support portion 20HBL so as to be rotatable around the first rotation axis RX1 (see FIG. 19A)
  • the right first shaft portion 30SBR is supported by the left first shaft portion 20HBL. It is supported by the first shaft support portion 20HBR so as to be rotatable around the first rotation axis RX1.
  • the second link member 40 and the lens holding member 20 are connected via the second shaft portion 40SF and the second shaft support portion 20HF.
  • the second shaft portion 40SF includes a left second shaft portion 40SFL and a right second shaft portion 40SFR
  • the second shaft support portion 20HF includes a left second shaft support portion 20HFL and a right second shaft support portion 20HFR.
  • the left second shaft portion 40SFL is supported by the left second shaft support portion 20HFL so as to be rotatable around the second rotation axis RX2 (see FIG. 19A)
  • the right second shaft portion 40SFR is supported by the left second shaft portion 20HFL. It is supported by the second shaft support portion 20HFR so as to be rotatable around the second rotation axis RX2.
  • the first shaft support portion 20HB has a U-shaped first recess portion UR11 that is open on the X2 side (rear side).
  • the first shaft portion 30SB is located inside the first recess UR11, and is configured such that a gap D3 is formed between the inner bottom surface of the first recess UR11 and the first shaft portion 30SB.
  • the second shaft support portion 20HF has an oblong through hole TH11 including a U-shaped recess.
  • the oblong through-hole TH11 may be a U-shaped recess.
  • the second shaft portion 40SF is positioned inside the oval through hole TH11, and is between the front side of the inner peripheral surface of the oval through hole TH11 corresponding to the inner bottom surface of the U-shaped recess and the second shaft portion 40SF. is configured to form a gap D4 at.
  • the first link member 30 and the base member 70 are connected via the third shaft portion 30SF and the third shaft support portion 70HF.
  • the third shaft portion 30SF includes a left third shaft portion 30SFL and a right third shaft portion 30SFR
  • the third shaft support portion 70HF includes a left third shaft support portion 70HFL and a right A third pivot portion 70HFR is included.
  • the left third shaft portion 30SFL is supported by the left third shaft support portion 70HFL so as to be rotatable about the third turning shaft RX3 (see FIG. 19A)
  • the right third shaft portion 30SFR is supported by the left third shaft support portion 70HFL. It is supported by the third shaft support portion 70HFR so as to be rotatable around the third rotation axis RX3.
  • the second link member 40 and the base member 70 are connected via the fourth shaft portion 40SB and the fourth shaft support portion 70HB.
  • the fourth shaft portion 40SB includes a left fourth shaft portion 40SBL and a right fourth shaft portion 40SBR
  • a fourth shaft support portion 70HB includes a left fourth shaft support portion 70HBL and a right fourth shaft portion 70HBL.
  • a fourth pivot portion 70HBR is included.
  • the fourth left shaft portion 40SBL is supported by the fourth left shaft support portion 70HBL so as to be rotatable around the fourth rotation shaft RX4 (see FIG. 19A)
  • the fourth right shaft portion 40SBR is supported by the fourth left shaft portion 70HBL. It is supported by the fourth shaft support portion 70HBR so as to be rotatable around the fourth rotation axis RX4.
  • the first link member 30 and the second link member 40 are connected via the fifth shaft portion 40SC and the fifth shaft support portion 30HC.
  • the fifth shaft portion 40SC includes a fifth left shaft portion 40SCL and a fifth right shaft portion 40SCR
  • the fifth shaft support portion 30HC includes a fifth left shaft support portion 30HCL and a fifth right shaft support portion 30HCR.
  • the left fifth shaft portion 40SCL is supported by the left fifth shaft support portion 30HCL so as to be rotatable about the fifth rotation axis RX5 (see FIG. 19A)
  • the right fifth shaft portion 40SCR is supported by the left fifth shaft support portion 30HCL. It is supported by the fifth shaft support portion 30HCR so as to be rotatable around the fifth rotation axis RX5.
  • the lens holding member 20 and the first link member 30 are connected via the first shaft portion 30SB and the first shaft support portion 20HB. It is connected to the link member 40 via the second shaft portion 40SF and the second shaft support portion 20HF.
  • the base member 70 and the first link member 30 are connected via a third shaft portion 30SF and a third shaft support portion 70HF, and the base member 70 and the second link member 40 are connected via a fourth shaft portion 40SB. and the fourth shaft support portion 70HB.
  • the first link member 30 and the second link member 40 are connected via the fifth shaft portion 40SC and the fifth shaft support portion 30HC.
  • the pantograph link mechanism PLM is configured such that the sizes of the gaps D3 and D4 change when the lens holding member 20 moves along the optical axis direction. This is to prevent the posture of the lens holding member 20 from changing when the lens holding member 20 moves along the optical axis direction.
  • the pantograph link mechanism PLM is arranged such that the size of the gap D3 decreases as the lens holding member 20 moves upward (in the Z1 direction), and the gap D4 increases. is configured to increase in size.
  • the sensor 12 is attached not to the base member 70 but to a part of the biasing member 6. Specifically, as shown in FIGS. 17B and 18, the sensor 12 is positioned between the front surface (X1 side surface) of the sensor 12 and the rear side (X2 side surface) of a portion of the biasing member 6. It is attached to the biasing member 6 with the sensor circuit board 14 interposed therebetween.
  • the lens driving device 101 includes, for example, as shown in FIG. A guide mechanism GM that guides the member 2 so as to be movable in the optical axis direction with respect to the fixed side member FB, and a piezoelectric driving section that includes at least a piezoelectric element 8 that moves the lens holding member 2 in the optical axis direction.
  • PD and a link mechanism LM as a restriction mechanism that is disposed between the lens holding member 2 and the fixed side member FB and suppresses a change in posture when the lens holding member 2 moves in the optical axis direction.
  • the lens driving device 101 can suppress the inclination of the lens holding member 2 when the lens holding member 2 is moved in the optical axis direction by frictional driving using the piezoelectric element 8 . Therefore, the lens driving device 101 can suppress the tilting of the optical axis JD. With this configuration, the lens holding member 2 can move along the optical axis direction while maintaining a horizontal state, for example.
  • the link mechanism LM may have a first link member 3 and a second link member 4, as shown in FIG. 2, for example.
  • the first link member 3 is connected to the lens holding member 2 so as to be rotatable about the first rotation axis RA1
  • the second link member 4 is connected to the second It may be connected to the lens holding member 2 so as to be rotatable around the second rotation axis RA2.
  • the first link member 3 is connected to a base member 7 as a fixed side member FB so as to be rotatable around a third rotation axis RA3, and the second link member 4 is connected to a fourth rotation axis.
  • first rotation axis RA1 and the second rotation axis RA2 may be arranged so as to cross each other.
  • the first rotation axis RA1 and the second rotation axis RA2 are arranged so as to be orthogonal to each other.
  • the first rotation axis RA1 is orthogonal to the optical axis direction
  • the second rotation axis RA2 is orthogonal to the optical axis direction.
  • the lens driving device 101 can regulate the change in the attitude of the lens holding member 2 by the link mechanism LM, which has a simple configuration with two link members.
  • the first rotation axis RA1 and the third rotation axis RA3 are parallel to each other, and the second rotation axis RA2 and the fourth rotation axis RA4 are parallel to each other. are parallel to each other.
  • the first rotation axis RA1 is orthogonal to the optical axis direction
  • the second rotation axis RA2 is orthogonal to the optical axis direction. That is, the first rotation axis RA1 is perpendicular to the optical axis JD, and the second rotation axis RA2 is perpendicular to the optical axis JD.
  • the first rotation axis RA1 and the second rotation axis RA2 are orthogonal to each other.
  • the first link member 3 and the lens holding member 2 are connected via the first shaft portion 2S and the first shaft support portion 3H, and the second link The member 4 and the lens holding member 2 are connected via the second shaft portion 2T and the second shaft support portion 4H.
  • the first shaft support portion 3H has a U-shaped first concave portion UR1 whose front side (X1 side) is open.
  • the first shaft portion 2S is located inside the first recess portion UR1 and is configured to form a gap D1 between the inner bottom surface of the first recess portion UR1 and the first shaft portion 2S.
  • the second shaft supporting portion 4H has a U-shaped second concave portion UR2 that is open on the right side (Y2 side).
  • the second shaft portion 2T is located inside the second recess portion UR2, and is configured such that a gap D2 can be formed between the inner bottom surface of the second recess portion UR2 and the second shaft portion 2T.
  • the link mechanism LM prevents the lens holding member 2 from receiving undesired force from the first link member 3 and the second link member 4 when the lens holding member 2 moves in the optical axis direction. can be suppressed.
  • the first rotation axis RA1 and the second rotation axis RA2 are desirably configured to be positioned at different positions (heights) in the optical axis direction.
  • the first rotation axis RA1 and the second rotation axis RA2 are arranged with an interval V1 in the optical axis direction (Z-axis direction) as shown in FIG. 5A.
  • the lens driving device 101 can prevent the first link member 3 and the second link member 4 from interfering with each other when the lens holding member 2 moves in the optical axis direction.
  • the first link member 3 has a pair of third shafts 3S rotatably supported by the base member 7, and the second link member 4 is rotatably supported by the base member 7. It has a pair of supported fourth shafts 4S.
  • the left-side third shaft portion 3SL, which is one of the third shaft portions 3S, and the rear-side fourth shaft portion 4SB, which is one of the fourth shaft portions 4S, are arranged on the left rear side of the base member 7 as shown in FIG. 3A. They are arranged so that at least a part of them overlap in the optical axis direction at the corners of the sides.
  • the size of the lens driving device 101 can be reduced compared to a configuration in which the third shaft portion 3S and the fourth shaft portion 4S are arranged so as not to overlap at all in the optical axis direction.
  • this configuration can reduce at least one of the dimension in the X-axis direction and the dimension in the Y-axis direction of the lens driving device 101 .
  • the base member 7 as the fixed side member FB desirably includes a pair of third shaft supports 7H (see FIG. 3A) that rotatably supports the pair of third shafts 3S, and a pair of fourth shafts 4S. and a pair of fourth shaft supports 7J (see FIG. 3C) that rotatably support the .
  • each of the pair of third shaft support portions 7H has a third concave portion UR3 with an open top.
  • a rear fourth shaft support portion 7JB that is one of the pair of fourth shaft support portions 7J is provided below the left third shaft support portion 7HL that is one of the pair of third shaft support portions 7H. are placed.
  • the rear fourth pivotal support portion 7JB is configured by a recess that is open on the right side (Y2 side).
  • the size of the lens driving device 101 can be reduced compared to a configuration in which the third shaft support portion 7H and the fourth shaft support portion 7J are arranged so as not to overlap at all in the optical axis direction.
  • this configuration can reduce at least one of the dimension in the X-axis direction and the dimension in the Y-axis direction of the lens driving device 101 .
  • this configuration provides an effect that the first link member 3 can be easily attached to the third shaft support portion 7H because the third shaft support portion 7H has the third concave portion UR3 with an open top.
  • the first link member 3 includes, as shown in FIG. 3A, a first base portion 3B formed with a pair of third shaft portions 3S rotatably supported by the base member 7, and a first base portion 3B. It is configured to have a pair of first arm portions 3A connected to the base portion 3B and opposed to each other. A first shaft support portion 3H is formed at the tip of each of the pair of first arm portions 3A.
  • the second link member 4 includes a second base portion 4B formed with a pair of fourth shaft portions 4S rotatably supported by the base member 7, and a second base portion 4B. It has a pair of second arm portions 4A that are connected and face each other.
  • a second shaft support portion 4H is formed at the tip of each of the pair of second arm portions 4A.
  • the lens holding member 2 includes a pair of first shaft portions 2S supported by a pair of first shaft support portions 3H and a pair of second shaft portions 2S supported by a pair of second shaft support portions 4H. Two shaft portions 2T are formed.
  • This configuration has the effect of simplifying the shape of the lens holding member 2 in that the lens holding member 2 does not have a shaft supporting portion for supporting the shaft portion. Therefore, this configuration can prevent the structure of the mold used for injection molding the lens holding member 2 from becoming complicated.
  • the piezoelectric driving section PD is configured to include a contact member 9 that overlaps the rear side (X2 side) of the piezoelectric element 8, as shown in FIGS. 12A and 12B.
  • the rear side of the piezoelectric element 8 is the side facing the lens holding member 2 as shown in FIG. 11A.
  • each of the piezoelectric element 8 and the contact member 9 extends in the direction of the first rotation axis RA1 (the direction parallel to the Y-axis), which is the axis of the pair of first shaft portions 2S.
  • At least a portion of the front second shaft portion 2TF, which is one of the pair of second shaft portions 2T, is arranged on the lower side of the contact member 9. As shown in FIG.
  • the size of the lens driving device 101 can be reduced compared to a configuration in which the second shaft portion 2T is not arranged below the contact member 9. Specifically, this configuration can reduce at least one of the dimension in the X-axis direction and the dimension in the Y-axis direction of the lens driving device 101 .
  • a pantograph-type link mechanism PLM having a first link member 30 and a second link member 40 is adopted as a regulation mechanism.
  • the first link member 30 is connected to the lens holding member 20 so as to be rotatable about the first rotation axis RX1.
  • the second link member 40 is connected to the lens holding member 20 so as to be rotatable around the second rotation axis RX2.
  • the first link member 30 is connected to the base member 70 so as to be rotatable about the third rotation axis RX3, and the second link member 40 is rotatable about the fourth rotation axis RX4.
  • first link member 30 and the second link member 40 are connected to each other so as to be rotatable about the fifth rotation axis RX5.
  • the first rotation axis RX1, the second rotation axis RX2, the third rotation axis RX3, the fourth rotation axis RX4, and the fifth rotation axis RX5 are parallel to each other and perpendicular to the optical axis direction. are arranged so that
  • the lens driving device 101A can suppress the inclination of the lens holding member 20 when the lens holding member 20 moves in the optical axis direction by frictional driving using the piezoelectric element 8. Therefore, the lens driving device 101A can prevent the optical axis JD from tilting. With this configuration, the lens holding member 20 can move along the optical axis direction, for example, while maintaining a horizontal state.
  • the first shaft support portion 20HB has a U-shaped first concave portion UR11 with an open rear side (X2 side).
  • the first shaft portion 30SB is located inside the first recess portion UR11 and is configured to form a gap D3 between the inner bottom surface of the first recess portion UR11 and the first shaft portion 30SB.
  • the second shaft support portion 20HF has an oblong through hole TH11 including a U-shaped concave portion.
  • the second shaft portion 40SF is positioned in the oval through hole TH11, and the front side of the inner peripheral surface of the oval through hole TH11 corresponding to the inner bottom surface of the U-shaped recess and the second shaft portion 40SF It is configured so that a gap D4 can be formed between.
  • the pantograph type link mechanism PLM like the link mechanism LM, prevents the lens holding member 20 from moving from the first link member 30 and the second link member 40 when the lens holding member 20 moves in the optical axis direction. It is possible to suppress receiving a desired force.
  • the piezoelectric driving portion PD is biased toward the rear side (X2 side), which is the side of the lens holding member 2, by the biasing member 6. 2 is attached with a receiving member 11 that comes into contact with the piezoelectric driving portion PD that receives the biasing force of the biasing member 6 .
  • the piezoelectric driving section PD is biased by the biasing member 6 toward the rear side (X2 side), which is the lens holding member 20 side. 20 is attached with a receiving member 11 (see FIG. 18) that comes into contact with the piezoelectric driving portion PD that receives the biasing force of the biasing member 6 .
  • This configuration can prevent the lens holding member 2 or the lens holding member 20 made of synthetic resin from being worn due to contact with the piezoelectric drive part PD. This is because, in this configuration, the piezoelectric drive part PD is arranged so as to contact the receiving member 11 that is less likely to wear than the lens holding member 2 or the lens holding member 20 .
  • the guide mechanism GM includes two guide portions (a left guide portion GML and a right guide portion GMR ).
  • the left guide portion GML and the right guide portion GMR are respectively a movable groove portion 2G (see FIG. 10A) as a first groove portion provided in the lens holding member 2 and a movable groove portion 2G provided in the base member 7. and a ball 5 arranged between the movable groove 2G and the fixed groove 7G.
  • the movable side groove part 2G is formed so as to extend in the optical axis direction, as shown in FIG. 9B. As shown in FIG.
  • the fixed groove 7G is divided into two recesses 7V so that the ball 5 does not move in the optical axis direction.
  • the guide mechanism GM may be configured such that the fixed side groove portion 7G extends in the optical axis direction and the movable side groove portion 2G is divided into a plurality of concave portions.
  • the guide mechanism GM may be configured such that each of the movable side groove portion 2G and the fixed side groove portion 7G extends in the optical axis direction.
  • the guide mechanism GM configured in this manner can suppress deformation of the cylindrical portion 2C of the lens holding member 2 due to the biasing force of the biasing member 6. This is because both the guide mechanism GM and the biasing member 6 are arranged on one side (X1 side) of the lens holding member 2 . This is because the tubular portion 2 ⁇ /b>C of the lens holding member 2 is not pinched between the guide mechanism GM and the biasing member 6 .
  • At least one of the movable groove portion 2G and the fixed groove portion 7G may be divided into at least two recesses.
  • the balls 5 include a first ball housed in one of the at least two recesses and a second ball housed in another one of the at least two recesses.
  • the left fixed groove 7GL is divided into an upper left recess 7VLU and a left lower recess 7VLD
  • the right fixed groove 7GR is divided into an upper right recess 7VRU and a lower right recess 7VRD.
  • the ball 5 includes an upper left ball 5LU accommodated in the upper left recess 7VLU, a lower left ball 5LD accommodated in the lower left recess 7VLD, and an upper right ball 5LD accommodated in the upper right recess 7VRU. It includes a side ball 5RU and a lower right ball 5RD housed in a lower right concave portion 7VRD.
  • This configuration can prevent the gap between the left upper ball 5LU and the left lower ball 5LD sandwiched between the left movable groove 2GL and the left fixed groove 7GL from becoming smaller. Similarly, this configuration can prevent the space between the upper right ball 5RU and the lower right ball 5RD sandwiched between the right movable groove 2GR and the right fixed groove 7GR from becoming smaller. Therefore, this configuration can more reliably suppress tilting of the lens holding member 2 when the lens holding member 2 moves in the optical axis direction.
  • the lens holding member 2 has the shaft portions (the first shaft portion 2S and the second shaft portion 2T) and is configured to have no shaft support portion. may be configured to have In this case, the first link member 3 may be configured to have a shaft portion corresponding to the shaft support portion. The same applies to the second link member 4 as well.
  • the base member 7 has the shaft support portions (the third shaft support portion 7H and the fourth shaft support portion 7J) and is configured not to have a shaft portion. It may be configured as In this case, the first link member 3 may be configured to have a shaft supporting portion corresponding to the shaft portion. The same applies to the second link member 4 as well.
  • the first shaft portion 2S is configured to have the left first shaft portion 2SL and the right first shaft portion 2SR, that is, to have a pair of shaft portions. It may be composed of a combination of a part and a pivot part.
  • the first shaft portion 2S may be configured to have a left first shaft portion 2SL and a right first shaft support portion (not shown).
  • the first shaft support portion 3H may be configured to have a left first shaft support portion 3HL and a right first shaft portion (not shown).
  • the second shaft portion 2T, the second shaft support portion 4H, the third shaft portion 3S, the third shaft support portion 7H, the fourth shaft portion 4S, and the fourth shaft support portion 7J is configured to have the left first shaft portion 2SL and the right first shaft portion 2SR, that is, to have a pair of shaft portions. It may be composed of a combination of a part and a pivot part.
  • the first shaft portion 2S may be configured to have a left first shaft portion 2SL and a right first shaft support portion (not shown).
  • the above modifications can be similarly applied to the lens holding member 20, the first link member 30, the second link member 40, and the base member 70 in the lens driving device 101A.
  • the number of a set of balls 5 arranged between the movable groove portion 2G and the fixed groove portion 7G may be three or more, or may be one.
  • there are two right balls 5R an upper right ball 5RU and a lower right ball 5RD arranged between the right movable groove 2GR and the right fixed groove 7GR.
  • only one left ball 5L is arranged between the left movable groove 2GL and the left fixed groove 7GL.
  • Cover member 1A Peripheral wall part 1B... Ceiling part 1K... Opening 1S... Receiving part 2... Lens holding member 2B... Columnar part 2BL... Left columnar part 2BR...right columnar part 2C...cylindrical part 2G...movable side groove part 2GL...left movable side groove part 2GR...right movable side groove part 2S...first shaft part 2SL...left side First shaft portion 2SR... Right side first shaft portion 2T... Second shaft portion 2TB... Rear side second shaft portion 2TF... Front side second shaft portion 3...
  • First link member 3A (First arm 3AL ⁇ Left first arm 3AR ⁇ Right first arm 3B ⁇ First base 3H ⁇ First pivot 3HL ⁇ Left first pivot 3HR ⁇ Right first shaft support 3S ⁇ Third shaft 3SL ⁇ Left third shaft 3SR ⁇ Right third shaft 4 ⁇ Second link member 4A ⁇ Second arm 4AB ... rear second arm 4AF ... front second arm 4B ... second base 4H ... second shaft support 4HB ... rear second shaft 4HF ... front second Shaft support part 4S...4th shaft part 4SB...Rear side 4th shaft part 4SF...Front side 4th shaft part 5...Ball 5L...Left side ball 5LD...Left lower side ball 5LU... ⁇ Upper left ball 5R...
  • second link member 40SB fourth shaft portion 40SBL...left fourth shaft part 40SBR...right fourth shaft part 40SC...fifth shaft part 40SCL...left fifth shaft part 40SCR...right fifth shaft part 40SF...second Shaft portion 40SFL... Left side second shaft portion 40SFR... Right side second shaft portion 70... Base member 70HB... Fourth shaft support portion 70HBL... Left side fourth shaft support portion 70HBR...

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)
  • Camera Bodies And Camera Details Or Accessories (AREA)
PCT/JP2022/002607 2021-01-26 2022-01-25 レンズ駆動装置及びカメラモジュール Ceased WO2022163630A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280009580.3A CN116710840A (zh) 2021-01-26 2022-01-25 透镜驱动装置以及相机模块
JP2022578399A JP7406014B2 (ja) 2021-01-26 2022-01-25 レンズ駆動装置及びカメラモジュール

Applications Claiming Priority (2)

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JP2021-010630 2021-01-26
JP2021010630 2021-01-26

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2025205108A1 (ja) * 2024-03-27 2025-10-02 アルプスアルパイン株式会社 圧電駆動装置

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Publication number Priority date Publication date Assignee Title
JP2010097216A (ja) * 2008-10-15 2010-04-30 Samsung Techwin Co Ltd レンズ駆動ユニット及びこれを備えるカメラモジュール
JP2013242426A (ja) * 2012-05-21 2013-12-05 Konica Minolta Inc 駆動機構およびレンズ移動機構
JP2014085397A (ja) * 2012-10-19 2014-05-12 Tdk Corp レンズ駆動装置
JP2014219654A (ja) * 2013-05-08 2014-11-20 オプティス カンパニー，リミテッド カメラモジュール
WO2017069491A1 (en) * 2015-10-20 2017-04-27 Samsung Electronics Co., Ltd. Camera module having stabilizer and electronic device including the same

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Publication number Priority date Publication date Assignee Title
JP5413391B2 (ja) * 2011-03-18 2014-02-12 Ｔｄｋ株式会社 レンズ駆動装置

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Publication number Priority date Publication date Assignee Title
JP2010097216A (ja) * 2008-10-15 2010-04-30 Samsung Techwin Co Ltd レンズ駆動ユニット及びこれを備えるカメラモジュール
JP2013242426A (ja) * 2012-05-21 2013-12-05 Konica Minolta Inc 駆動機構およびレンズ移動機構
JP2014085397A (ja) * 2012-10-19 2014-05-12 Tdk Corp レンズ駆動装置
JP2014219654A (ja) * 2013-05-08 2014-11-20 オプティス カンパニー，リミテッド カメラモジュール
WO2017069491A1 (en) * 2015-10-20 2017-04-27 Samsung Electronics Co., Ltd. Camera module having stabilizer and electronic device including the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2025205108A1 (ja) * 2024-03-27 2025-10-02 アルプスアルパイン株式会社 圧電駆動装置

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CN116710840A (zh) 2023-09-05
JPWO2022163630A1 (https=) 2022-08-04

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