JP2016051046A - Lens drive device - Google Patents

Lens drive device Download PDF

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Publication number
JP2016051046A
JP2016051046A JP2014176027A JP2014176027A JP2016051046A JP 2016051046 A JP2016051046 A JP 2016051046A JP 2014176027 A JP2014176027 A JP 2014176027A JP 2014176027 A JP2014176027 A JP 2014176027A JP 2016051046 A JP2016051046 A JP 2016051046A
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portion
optical axis
axis direction
side
drive unit
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JP2014176027A
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JP6303928B2 (en
Inventor
勝 宇野
Masaru Uno
勝 宇野
和朋 伊美
Kazutomo Imi
和朋 伊美
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Tdk株式会社
Tdk Corp
Tdk株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device that can suppress increase in size in an optical axis direction of a lens held by a lens holder.SOLUTION: In a lens drive device 1, as a part located on an outer side of a first drive unit 5 when viewed from a side of the first drive unit 5 to an optical axis direction OA, a substrate 61 has: a first part 66 that is located so as to run from a first corner 5a; a second part 67 that is located so as to run from a third corner 5c; and a third part 68 that is located so as to run from a fourth corner 5d. A second drive unit 70 is configured to move a second and third parts 67 and 68 along the optical axis direction OA, and thereby vary an inclination of the substrate 61.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lens driving device.

  A lens holder, an actuator for moving the lens holder in the optical axis direction of the lens held by the lens holder, a first drive unit having a substrate on which an imaging element is placed so as to face the lens, and the optical axis direction There is known a lens driving device that includes a base disposed to face the first driving unit and a second driving unit that corrects camera shake by changing the inclination of the first driving unit (for example, Patent Document 1).

JP 2010-096859 A

  However, the lens driving device described in Patent Document 1 has the following problems.

  The first drive unit has a sensor cover at a position facing the base in the optical axis direction. The sensor cover is formed with a support receiving portion that protrudes toward the base side in the optical axis direction. A hole is formed at the protruding tip of the support receiving portion. On the other hand, the base is formed with a support protrusion protruding toward the sensor cover in the optical axis direction so as to be fitted into the hole of the support receiving portion. The inclination of the first drive part changes with the support receiving part and the support projection as the center of tilting.

  The fitting portion of the support protrusion and the support receiving portion has a predetermined size in the optical axis direction so that the support protrusion and the support receiving portion do not come apart from each other when the first driving portion tilts. . Since the support protrusion and the support receiving portion are located inside the outer shape of the first drive unit when viewed from the first drive unit side in the optical axis direction, the first drive unit and the base are arranged on the optical axis. There is no choice but to dispose at least the predetermined size in the direction. Such a situation leads to an increase in the size of the lens driving device in the optical axis direction.

  An object of this invention is to provide the lens drive device which can suppress the enlargement in the optical axis direction of the lens hold | maintained at a lens holder.

  The lens driving device according to the present invention includes a lens holder and an actuator for moving the lens holder in the optical axis direction of the lens held by the lens holder, and the outer shapes viewed from the optical axis direction are located diagonally to each other. A first drive unit having a rectangular shape having first and second corners and third and fourth corners located diagonally to each other and a first drive unit are disposed and held by the lens holder A substrate on which the imaging element is placed so as to face the lens, and a second drive unit that corrects camera shake by changing the tilt of the substrate, and the substrate is viewed from the first drive unit side in the optical axis direction. As a part located outside the first drive part, a first part located so as to extend from the first corner part, a second part located so as to extend from the third triangular part, and a part extending from the fourth corner part A third part, and Second driving unit, by moving along the second and third part in the optical axis direction to change the tilt of the substrate.

  In the lens driving device according to the present invention, the second driving portion and the third portion move along the optical axis direction, so that the first driving portion is disposed and the inclination of the substrate on which the imaging element is placed changes. To do. That is, the first portion functions to form the tilt center of the substrate, and the substrate is tilted. Since the first to third parts are located outside the first driving part when viewed from the first driving part side in the optical axis direction, the size of the lens driving device in the optical axis direction is determined from the first part to the third part. It is difficult to be constrained by the size of the portion in the optical axis direction. As a result, an increase in the size of the lens driving device in the optical axis direction is suppressed. Further, in the lens driving device according to the present invention, the camera shake is corrected by changing the tilt of the substrate on which the first driving unit is disposed and the imaging element is placed. That is, camera shake is corrected with a relatively simple configuration in which the second drive unit changes the tilt of the substrate. Also in this respect, an increase in the size of the lens driving device in the optical axis direction is suppressed.

  The lens driving device is disposed on the side opposite to the first driving unit with respect to the substrate, and is a second corner portion as a portion located outside the first driving unit and the substrate when viewed from the first driving unit side in the optical axis direction. And a base having at least an outer portion located on the outer side of the first drive portion. The second drive portion includes a column member located on the outer portion of the base and an outer shape of the first drive portion as viewed from the first drive portion side in the optical axis direction. It is located outside the side located between the second corner part and the third triangular part in the shape and along the side, and is connected to the column member so as to be able to swing and to face each other in the optical axis direction. A pair of first arm members that are spaced apart from each other, and located on the outer side of the third triangular portion when viewed in the optical axis direction from the first drive portion side, and are connected to each first arm member and engage with the second portion To contact the first connecting member, the column member and the first connecting member. A first piezoelectric actuator located between one arm member and moving the first connecting member along the optical axis direction; and a first piezoelectric actuator in the outer shape of the first driving unit as viewed from the first driving unit side in the optical axis direction. It is located outside the side located between the two corners and the fourth corner and along the side, is connected to the column member so as to be swingable, and is separated from each other in the optical axis direction. A pair of second arm members that are connected to each second arm member and engaged with the third portion, as viewed from the first drive portion side in the optical axis direction, on the outer side of the fourth square portion. A second piezoelectric actuator that is positioned between each second arm member so as to contact the second coupling member and the column member and the second coupling member, and moves the second coupling member along the optical axis direction; You may have. In this case, the second driving unit having the column member, the first and second arm members, the first and second connecting members, and the first and second piezoelectric actuators is viewed from the first driving unit side in the optical axis direction. Since it is located outside the first drive unit, an increase in the size of the lens drive device in the optical axis direction is further suppressed. In addition, since a piezoelectric actuator which is a relatively compact actuator among the actuators is used, it is possible to easily realize a configuration that further suppresses the enlargement of the lens driving device in the optical axis direction. The side where the first arm member is located along the side located between the second corner and the third triangle, and the second arm member is located between the second corner and the fourth corner It is located along. Thereby, the enlargement of the lens driving device in the surface direction orthogonal to the optical axis direction is also suppressed.

  The substrate may have protrusions protruding in the optical axis direction at the second and third portions, and the first and second connecting members may each have a groove with which the protrusion is engaged. In this case, the engagement between the second portion and the first connecting member and the engagement between the third portion and the second connecting member can be realized with a simple configuration.

  The protrusion in the second portion has a spherical shape, and the groove in the first connecting member extends in a direction parallel to the side located between the first corner and the triangular portion in the outer shape of the first drive unit. It may be a V-groove. In this case, since the spherical protrusion and the V-groove are in point contact, the frictional force generated between the protrusion and the groove is smaller than that of the protrusion and groove engaged by line contact or surface contact. For this reason, since the spherical projection moves smoothly along the direction parallel to the side in the V-groove, the second portion moves smoothly along the optical axis direction. As a result, variations in changing the tilt of the substrate are suppressed, so that more stable camera shake correction can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, the lens drive device which can suppress the enlargement in the optical axis direction of the lens hold | maintained at a lens holder can be provided.

It is a perspective view which shows the lens drive device which concerns on one Embodiment of this invention. It is a schematic diagram which shows the structure of the lens drive device which concerns on this embodiment. It is a disassembled perspective view which shows the lens drive device which concerns on this embodiment. It is a disassembled perspective view which shows a 1st drive part. It is a disassembled perspective view which shows a subbase and its periphery. It is a disassembled perspective view which shows a lens holder and its periphery. It is a perspective view which shows a spring member. It is a top view which shows a board | substrate and its periphery. It is a disassembled perspective view which shows the movable part of a 2nd drive part. It is a top view which shows the movable part of a 2nd drive part. It is a top view which shows the movable part of a 2nd drive part. It is a disassembled perspective view which shows the piezoelectric actuator unit of a 2nd drive part. It is a schematic diagram for demonstrating the drive state of a 2nd drive part. It is a schematic diagram for demonstrating the drive state of the lens drive device which concerns on this embodiment. It is a schematic diagram for demonstrating the drive state of the lens drive device which concerns on this embodiment. It is a schematic diagram for demonstrating the drive state of the lens drive device which concerns on this embodiment. It is a schematic diagram for demonstrating the drive state of the lens drive device which concerns on this embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  First, the configuration of the lens driving device will be described with reference to FIGS. FIG. 1 is a perspective view showing a lens driving device according to an embodiment of the present invention. FIG. 2 is a schematic diagram illustrating the configuration of the lens driving device according to the present embodiment. FIG. 3 is an exploded perspective view showing the lens driving device according to the present embodiment.

  As shown in FIGS. 1 to 3 (particularly, FIG. 3), the lens driving device 1 includes a main cover 2, a main base (base) 3, a main circuit board 4, a first driving unit 5, a board unit 60, and A second drive unit 70. The lens driving device 1 is a device that drives a camera lens mounted on, for example, a mobile phone. The first drive unit 5, the substrate unit 60, and the second drive unit 70 are accommodated in a space defined by the main cover 2 and the main base 3.

  The main cover 2 has a surface portion 2a and a side surface portion 2b. The surface portion 2a has a rectangular shape in plan view. In the present embodiment, the rectangular shape includes not only a shape whose corner is a right angle but also a shape whose corner is chamfered or rounded. A perfect circular opening 2c is formed in the surface portion 2a. The side part 2b is erected from the four sides of the surface part 2a. A detailed configuration of the main base 3 will be described later. The main circuit board 4 is configured by, for example, an FPC (flexible print board). The main circuit board 4 is disposed on the main base 3 so as to be located outside the space defined by the main cover 2 and the main base 3. The main circuit board 4 is electrically connected to circuit boards 54 and 83 (described later) of the first and second drive units 5 and 70 and a control unit (not shown). That is, the main circuit board 4 functions as a relay board that electrically relays the first and second drive units 5 and 70 and the control unit.

  As shown in FIGS. 4 to 6, the first drive unit 5 includes a sub base 10, a sub cover 20, a lens holder 30, an actuator unit, a spring member 55, a regulating member 56, and a position detection unit. In the first drive unit 5, the sub base 10 and the sub cover 20 function as a housing.

  As shown in FIG. 5, the sub-base 10 has a bottom 11, a first side wall 12a, a second side wall 12b, a third side wall 12c, and a fourth side wall 12d. The bottom 11 has a rectangular shape in plan view. A perfect circle opening 11 e is formed in the bottom 11. The bottom portion 11 includes a first corner portion 11a, a second corner portion 11b, a third corner portion 11c, and a fourth corner portion 11d. The first and second corner portions 11a and 11b are located diagonally to each other, and the third and fourth corner portions 11c and 11d are located diagonally to each other. A circular hole portion 11f is formed in the first corner portion 11a.

  The first to fourth side wall portions 12a to 12d are erected from the first to fourth corner portions 11a to 11d, respectively. The first to fourth side wall portions 12 a to 12 d are formed integrally with the bottom portion 11.

  A semi-cylindrical notch 13a is formed inside the first side wall 12a. The notch 13a is positioned so that the central axis of the hole 11f of the first corner 11a is substantially the same. A lead wire notch 13b is formed in the first side wall 12a. Respective lead wires 53a and 53b described later are inserted into the lead wire cutout portion 13b.

  On the inner side of the second to fourth side wall portions 12b to 12d, each notch is located at a position corresponding to a first protrusion 33, a second protrusion 34, and a third protrusion 35 (see FIG. 6) described later. 13c, 13d, and 13e are formed. Each notch part 13c-13e is spaced apart so that it may not contact with each corresponding protrusion part 33-35.

  The sub-base 10 configured as described above is integrally formed of, for example, a liquid crystal polymer including a filler (glass fiber or inorganic material).

  As shown in FIG. 4, the sub cover 20 has a surface portion 21 and a side surface portion 22. The surface portion 21 has a rectangular shape in plan view and faces the bottom portion 11 of the sub-base 10. In the surface portion 21, a perfectly circular opening 21 a is formed at a position facing the opening 11 e of the bottom portion 11. The side part 22 is erected from four sides of the surface part 21. The sub cover 20 is integrally formed of, for example, SPCC (cold rolled steel).

  As shown in FIG. 6, the lens holder 30 includes a body portion 31, a first protrusion portion 33, a second protrusion portion 34, a third protrusion portion 35, a first contact portion 36, and a second contact portion 37, Have

  The trunk | drum 31 is exhibiting the cylinder shape and becomes cross-sectional perfect circle shape. An internal thread portion 31 b is formed inside the body portion 31. The body portion 31 is integrally formed of, for example, LCP (liquid crystal polymer). The female screw portion 31b corresponds to a male screw portion (not shown) of the lens barrel LB that holds the lens. The lens barrel LB is attached to the lens holder 30 via the female screw portion 31b. As a result, the lens is indirectly held by the lens holder via the lens barrel LB. The lens may be held by the lens holder without using the lens barrel LB. The lens is exposed to the outside through the opening 11 e of the bottom 11 and the opening 21 a of the sub cover 20.

  Each protrusion part 33-35 protrudes toward the outer side from the outer peripheral surface 31a of the trunk | drum 31. As shown in FIG. The 1st protrusion part 33 has the protrusion part 33a and the spring fixing | fixed part 33b. The protrusion 33a has a substantially rectangular parallelepiped shape. The protruding portion 33a is disposed at a position corresponding to the second corner portion 11b. A hemispherical spherical portion 33 c protruding in the circumferential direction of the body portion 31 is formed in the protruding portion 33 a. The spring fixing portion 33b is formed at the base of the protruding portion 33a. The spring fixing portion 33b has a protruding shape so that one end portion 55a of a spring member 55 described later is engaged.

  The 2nd protrusion part 34 has two protrusion part 34a, 34b. Each protruding portion 34a, 34b has a substantially triangular shape in plan view. The 2nd protrusion part 34 is arrange | positioned in the position corresponding to the 2nd corner | angular part 11b. The protruding portions 34a and 34b are spaced apart so as to face each other in the optical axis direction OA. The spacing between the projecting portions 34a and 34b in the optical axis direction OA is wider than the width of a base portion 55c of a spring member 55 described later. Holes 34c and 34d are formed in the protruding portions 34a and 34b, respectively. The holes 34c and 34d are positioned so that their central axes are substantially the same.

  The 3rd protrusion part 35 is arrange | positioned in the position corresponding to the 4th corner | angular part 11d. A magnet 57 described later is fixed to the third protrusion 35.

  The first contact portion 36 includes a protruding portion 36a and a slider 36b. The protruding portion 36a has a substantially triangular prism shape. The protruding portion 36a is disposed on the outer peripheral surface 31a of the body portion 31 in a direction in which the length direction is substantially parallel to the optical axis direction OA. The protruding portion 36a is positioned so as to correspond to the first corner portion 11a. The protrusion 36a is formed integrally with the outer peripheral surface 31a.

  The slider 36b is an L-shaped plate member. The slider 36b is made of, for example, a stainless steel plate material. The slider 36b is disposed along the side surface 36c of the protrusion 36a substantially parallel to the optical axis direction OA and the end surface of the protrusion 36a substantially orthogonal to the side surface 36c.

  The second contact portion 37 includes a projecting portion 37a and a slider 37b. The protruding portion 37a has a substantially triangular prism shape. The protruding portion 37 a is disposed on the outer peripheral surface 31 a of the body portion 31 with the length direction being substantially parallel to the optical axis direction OA. The protruding portion 37a is positioned so as to correspond to the first corner portion 11a. The protruding portion 37 a is positioned so as to be aligned with the protruding portion 36 a along the circumferential direction of the body portion 31. The protrusion 37a is formed integrally with the outer peripheral surface 31a.

  The slider 37b is an L-shaped plate member. The slider 37b is formed of, for example, a stainless steel plate. The slider 37b is disposed along the side surface 37c of the protrusion 37a substantially parallel to the optical axis direction OA and the end surface of the protrusion 36a substantially orthogonal to the side surface 37c. The slider 37b is positioned so that the side surface 37c of the slider 37b faces the side surface 36c of the slider 36b.

  The lens holder 30 configured as described above is disposed in the accommodation space defined by the bottom portion 11 and the first to fourth side wall portions 12a to 12d.

  As shown in FIG. 5, the actuator unit includes an actuator 50, a shaft 40, and a circuit board 54.

  The actuator 50 includes a piezoelectric element 51, a weight 52, and two lead wires 53a and 53b. As the actuator 50, for example, a known smooth impact drive mechanism is used.

  The piezoelectric element 51 is an electromechanical conversion element that expands and contracts in the optical axis direction OA of the lens, and is a so-called multilayer piezoelectric actuator. The piezoelectric element 51 includes an element body in which a plurality of piezoelectric layers and internal electrodes are stacked, and a pair of external electrodes 51a and 51b. Among the plurality of internal electrodes, one internal electrode facing the piezoelectric layer is exposed on one side surface of the element body and connected to the external electrode 51a disposed on the one side surface. Of the plurality of internal electrodes, the other internal electrode facing the piezoelectric layer is exposed on the other side facing the one side and is connected to the external electrode 51b disposed on the other side. The pair of external electrodes 51a and 51b are connected to the circuit board 54 via corresponding lead wires 53a and 53b.

  The weight 52 has a cylindrical shape and is formed of, for example, a tank stainless alloy. One end of the weight 52 is connected to one end of the piezoelectric element 51 so that displacement due to expansion and contraction of the piezoelectric element 51 occurs only on the shaft 40 side. The other end of the weight 52 is inserted into the hole 11f of the first corner 11a.

  Each lead wire 53a, 53b electrically connects the piezoelectric element 51 and the circuit board 54. Each lead wire 53a, 53b is arranged from the inner side to the outer side of the sub base 10 through a notch portion 13b formed in the first corner portion 11a.

  The shaft 40 has a cylindrical shape and is formed of, for example, CFRP (carbon-fiber-reinforced plastic). The shaft 40 is connected to the other end of the piezoelectric element 51. The outer peripheral surface 41 of the shaft 40 is in contact with the side surfaces 36c and 37c of the sliders 37b and 38b.

  The circuit board 54 is a so-called flexible printed circuit (FPC). As shown in FIG. 5, the circuit board 54 is disposed across the second side wall portion 12 b and the fourth side wall portion 12 d. The circuit board 54 is electrically connected to the actuator 50 and the main circuit board 4.

  As shown in FIG. 7, the spring member 55 includes one end portion 55 a, the other end portion 55 b, and a base portion 55 c. The one end portion 55a is a plate-like member that is divided into two portions so as to avoid the protruding portion 33a of the lens holder 30. The one end portion 55a has a tip portion that is bent toward the lens holder 30 side. The one end portion 55 a is arranged so that the tip portion engages with the spring fixing portion 33 b of the lens holder 30. The one end portion 55a is positioned so as to correspond to the second corner portion 11b.

  The other end 55b is a plate-like member that has a rectangular shape in plan view. The other end portion 55b is disposed so that the contact surface 55d is in contact with the shaft 40. The other end 55b is located so as to correspond to the first corner 11a.

  The base 55c is a band-like member and has a curved shape. Both ends of the base portion 55c are connected to one end portion 55a and the other end portion 55b. The base 55c has a shape that decreases in width as it approaches the one end 55a and the other end 55b, and increases in width as it approaches the central portion that is farthest from the one end 55a and the other end 55b. . That is, the base portion 55c has a shape in which the width of the central portion of the base portion 55c where large stress is likely to occur is widened, and the width in the vicinity of the one end portion 55a and the other end portion 55b is smaller than the central portion of the base portion 55c. ing.

  The spring member 55 configured as described above is integrally formed with, for example, a stainless steel band for a spring. The spring member 55 is disposed on the side of the lens holder 30 so as to be along the lens holder 30 (the outer periphery of the body portion 31). The spring member 55 applies a biasing force to the shaft 40 so that the shaft 40 and the lens holder 30 are brought into contact with each other.

  As shown in FIG. 6, the restricting member 56 has a cylindrical shape, and is formed of, for example, a stainless steel wire. The restricting member 56 is inserted into the hole 34c and the hole 34d formed in the protruding portions 34a and 34b. The regulating member 56 is located on the opposite side of the lens holder 30 with respect to the spring member 55. The outer peripheral surface 56 a of the regulating member 56 contacts the base portion 55 c of the spring member 55 when the spring member 55 moves in a direction away from the lens holder 30.

  The position detection unit includes a magnet 57 and a magnetic detection element 58. As shown in FIG. 6, the magnet 57 has a substantially rectangular parallelepiped shape, and is formed of, for example, a neodymium magnet. The magnet 57 is fixed to the third protrusion 35. The magnet 57 is located on the side opposite to the spring member 55 with respect to the lens holder 30.

  The magnetic detection element 58 is constituted by a Hall element, for example. As shown in FIG. 5, the magnetic detection element 58 is disposed on the circuit board 54. The magnetic detection element 58 is positioned away from the magnet 57 so as to face the magnet 57. When the lens holder 30 moves in the optical axis direction OA, the magnetic detection element 58 detects a change in the strength of the magnetic field formed by the magnet 57 and detects the position of the lens holder 30.

  In the first drive unit 5 configured as described above, as shown in FIG. 2, first and second corners 5a and 5b whose outer shapes viewed from the optical axis direction OA are diagonally located with each other, And third and fourth corner portions 5c and 5d located diagonally to each other.

  A control unit (not shown) drives the first drive unit 5 when receiving a predetermined signal. More specifically, when the piezoelectric element 51 is slowly extended in the optical axis direction OA, the lens holder 30 is moved by the frictional force together with the shaft 40. On the other hand, when the piezoelectric element 51 contracts instantaneously, only the shaft 40 moves and the lens holder 30 remains in that position. As described above, the autofocus function is realized by changing the position of the lens holder 30 in the optical axis direction OA.

  As shown in FIG. 3, the board unit 60 includes a board 61, a shake detection sensor 63, an infrared cut filter 64, and a circuit board 65.

  As shown in FIG. 8, the substrate 61 has a main body portion 61 a and first, second and third portions 66, 67 and 68. The main body portion 61a has a substantially rectangular shape in plan view. The first, second, and third portions 66, 67, 68 project outward from positions corresponding to the corners of the main body portion 61a. The substrate 61 is integrally formed of a material such as glass epoxy or paper phenol. The first drive unit 5 is disposed on one main surface of the main body portion 61 a of the substrate 61.

  The first to third portions 66, 67, 68 have protrusions 66a, 67a, 68a that protrude in the optical axis direction OA, respectively. Each protrusion 66a, 67a, 68a has a spherical shape and is integrally formed of the same material as the first to third portions 66, 67, 68. Each protrusion 66a, 67a, 68a has a circular edge that forms a boundary with the first, second and third portions 66, 67, 68. The first imaginary line L1 connecting the center points of the circular edges of the protrusions 66a and 67a and the second imaginary line L2 connecting the center points of the circular edges of the protrusions 66a and 68a They are substantially orthogonal as seen from the optical axis direction OA. Each of the protrusions 66a, 67a, 68a is a ball member made of, for example, stainless steel, and may be rotatably attached to the first to third portions 66, 67, 68.

  As shown in FIG. 3, the image sensor 62 is placed on one main surface of the main body portion 61 a of the substrate 61. The image sensor 62 is located between the substrate 61 and the first drive unit 5. The image sensor 62 is a solid-state image sensor such as a CCD or a CMOS, for example, and generates and outputs an image signal by photoelectric conversion. The image signal output from the image sensor 62 is sent to the circuit board 65.

  The shake detection sensor 63 is disposed on the other main surface of the main body portion 60 a of the substrate 61. The shake detection sensor 63 detects a shake about two axes orthogonal to the optical axis direction OA as an angular velocity and an angular acceleration. The detection signal output from the shake detection sensor 63 is sent to the circuit board 65. The two orthogonal axes used in the shake detection sensor 63 are preferably parallel to the first virtual line L1 and the second virtual line L2 described above.

  The circuit board 65 is configured by, for example, an FPC (flexible printed circuit board). The circuit board 65 is disposed between the board 61 and the shake detection sensor 63 in the optical axis direction OA. The circuit board 65 is electrically connected to the image sensor 62, the shake detection sensor 63, and the main circuit board 4. The circuit board 65 outputs the image signal of the image sensor 62 and the detection signal of the shake detection sensor 63 to the main circuit board 4.

  The infrared cut filter 64 is a rectangular filter. The infrared cut filter 64 is disposed between the image sensor 62 and the first drive unit 5. The infrared cut filter 64 reflects infrared light among light incident through the lens and transmits visible light.

  The substrate unit 60 configured as described above is arranged so that the lens held by the lens holder 30 and the image sensor 62 face each other. As shown in FIG. 2, the first to third portions 66, 67, 68 of the substrate 61 are positioned outside the outer shape of the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA. doing. More specifically, the first portion 66 is positioned so as to extend from the first corner portion 5a, the second portion 67 is positioned so as to extend from the third triangular portion 5c, and the third portion 68 is positioned as the fourth corner portion. It is located so as to extend from 5d.

  As shown in FIG. 3, the main base 3 has a bottom 3a, three side walls 3b, 3c, 3d, and a cylindrical portion 3e. The bottom 3a has four corners so as to have a rectangular shape. Each side wall 3b, 3c, 3d is erected from three corners of each corner of the bottom 3a. The cylindrical portion 3e is erected at one corner excluding the three corners where the side walls 3b, 3c, 3d are erected. The cylindrical portion 3e extends in a substantially orthogonal direction with respect to the bottom portion 3a and has a perfect cross-sectional shape. The main base 3 is integrally formed of, for example, a liquid crystal polymer containing a filler (glass fiber or inorganic material).

  As shown in FIG. 3, the main base 3 is disposed on the opposite side of the first drive unit 5 with respect to the substrate unit 60. The main base 3 is positioned such that the side on which the side wall portions 3b, 3c, 3d and the columnar portion 3e are erected is opposed to the substrate unit 60. The main base 3 is positioned in a direction in which the axial direction of the cylindrical portion 3e is substantially parallel to the optical axis direction OA. As shown in FIG. 2, the main base 3 is located outside the second corner portion 5 b as a portion located outside the first drive portion 5 and the substrate 61 when viewed from the first drive portion 5 side in the optical axis direction OA. It has the outer part 3f located in this. The cylindrical portion 3e is located in the outer portion 3f.

  The 2nd drive part 70 has the movable part 71 and the piezoelectric actuator unit 80, as FIG. 3 shows. As shown in FIG. 9, the movable portion 71 includes a column member 72, a pair of first arm members 73, a pair of second arm members 74, first and second connecting members 75 and 76, A contact member 77.

  As shown in FIG. 9, the column member 72 includes a main body portion 72 a and two projecting portions 72 b. The main body portion 72a has a substantially rectangular parallelepiped shape. A hole 72c having an elliptical cross section penetrating in the length direction is formed at the center of the main body portion 72a. Each protrusion 72b has a substantially triangular prism shape. Each projecting portion 72b is disposed on each of two orthogonal side surfaces of the main body portion 72a. Each protruding portion 72b is located near the center in the length direction of the main body portion 72a. Each protruding portion 72b is positioned in a direction in which the length direction is substantially orthogonal to the length direction of the main body portion 72a. The main body portion 72a and the protruding portions 72b are integrally formed.

  The column member 72 is positioned on the main base 3 such that the columnar portion 3e of the main base 3 is inserted into the hole 72c of the column member 72. That is, the column member 72 is a member extending along the optical axis direction OA, and, as shown in FIG. 2, when viewed from the first drive unit 5 side in the optical axis direction OA, outside the second corner portion 5b. positioned. Each protruding portion 72 b of the column member 72 is positioned so as to face the side wall portions 3 c and 3 d of the main base 3.

  As shown in FIG. 9, the pair of first arm members 73 includes a base 73a and first and second thin portions 73b and 73c. The pair of second arm members 74 includes a base portion 74a and first and second thin portions 74b and 74c. Each base 73a, 74a has a substantially rectangular parallelepiped shape. The first and second thin portions 73b, 74b, 73c, and 74c are members that are sufficiently thinner than the base portions 73a and 74a. The first and second thin portions 73b and 73c of each first arm member 73 are disposed at both ends in the length direction of the base portion 73a. The base 73a and the first and second thin portions 73b and 73c are integrally formed. The first and second thin portions 74b, 74c of each second arm member 74 are respectively disposed at both ends in the length direction of the base portion 74a. The base 74a and the first and second thin portions 74b and 74c are integrally formed.

  Each of the first thin portions 73b and 74b is connected to each side surface on which the protruding portion 72b of the column member 72 is disposed. The two pairs of first and second arm members 73 and 74 are positioned so as to be opposed to each other in the optical axis direction OA so as to sandwich the protruding portions 72b therebetween. As shown in FIG. 2, each first arm member 73 has a second corner portion 5 b and a third triangular portion 5 c in the outer shape of the first drive portion 5 when viewed from the first drive portion 5 side in the optical axis direction OA. It is located outside the side 5e located between and along the side 5e. Each second arm member 74 has a side 5f located between the second corner 5b and the fourth corner 5d in the outer shape of the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA. And is located along the side 5f.

  The 1st and 2nd connection members 75 and 76 are exhibiting the substantially rectangular parallelepiped shape, as FIG. 9 shows. The first and second connecting members 75 and 76 are connected to the second thin portions 73c and 74c, respectively, with the length direction being substantially parallel to the optical axis direction OA. As shown in FIG. 2, the first connecting member 75 is located outside the third triangular portion 5 c in the outer shape of the first driving unit 5 when viewed from the first driving unit 5 side in the optical axis direction OA. The second connecting member 76 is located outside the fourth rectangular portion 5d in the outer shape of the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA.

  As shown in FIG. 10, the first connecting member 75 has a direction (y direction) parallel to the side 5 g located between the first corner 5 a and the third triangular portion 5 c in the outer shape of the first drive unit 5. A pair of V-grooves (grooves) 75a is formed. The pair of V grooves 75a penetrates the first connecting member 75, respectively. The pair of V grooves 75a is positioned so as to face each other in the optical axis direction OA, and constitutes a part of the through hole. The surface forming each V groove 75 a is in point contact with the protrusion 67 a of the second portion 67. That is, the pair of V grooves 75a are in point contact with the protrusions 67a of the second portion 67 at a total of four locations. The protrusion 67a of the second portion 67 moves in the pair of V grooves 75a along the direction (y direction) substantially parallel to the side 5g when the second portion 67 moves along the optical axis direction OA. To do.

  As shown in FIG. 11, the second connecting member 76 has a direction parallel to the side 5h (x) between the first corner 5a and the fourth corner 5d in the outer shape of the first drive unit 5 (x A pair of rectangular grooves (grooves) 76a extending in the direction) are formed. Each rectangular groove 76 a passes through the second connecting member 76. Each rectangular groove 76a is positioned such that one surface is opposed to each other in the optical axis direction OA, and constitutes a part of the through hole. The surfaces of the rectangular grooves 76a facing each other in the optical axis direction OA are in point contact with the protrusions 68a of the third portion 68. That is, the pair of rectangular grooves 76a are in point contact with the protrusions 68a of the third portion 68 at a total of two locations. When the third portion 68 moves along the optical axis direction OA, the protrusion 68a of the third portion 68 moves in the pair of rectangular grooves 76a along the surface direction substantially orthogonal to the optical axis direction OA.

  The movable portion 71 configured as described above is integrally formed of a material such as an elastomer. The first and second connecting members 75 and 76 are respectively relative to the column member 72 along the optical axis direction OA by the two pairs of first and second arm members 73 and 74 functioning as hinges. Moving. At this time, each first arm member 73 swings along a side substantially parallel to the side 5e and the optical axis located between the second corner portion 5b and the third triangular portion 5c. Each second arm member 74 swings along a side substantially parallel to the side 5f and the optical axis located between the second corner 5b and the fourth corner 5d. That is, the movable portion 71 has a configuration similar to a parallel link mechanism.

  Each contact member 77 is a plate-like member and is made of, for example, zirconia. Each contact member 77 is disposed on the side surface of each of the first and second connecting members 75 and 76 so as to face each protruding portion 72 b of the column member 72.

  As shown in FIG. 3, the piezoelectric actuator unit 80 includes first and second piezoelectric actuator units 80a and 80b. The first piezoelectric actuator unit 80a includes a holding member 81, a first piezoelectric actuator 82a, and a circuit board 83. The second piezoelectric actuator unit 80 b includes a holding member 81, a second piezoelectric actuator 82 b, and a circuit board 83. The first and second piezoelectric actuator units 80a and 80b have a line-symmetric configuration, but the basic configuration is the same. Hereinafter, the configuration of the second piezoelectric actuator unit 80b will be described, and the description of the configuration of the first piezoelectric actuator 80a will be omitted.

  As shown in FIG. 12, the holding member 81 has a main body portion 81a and a pair of protruding portions 81b. The main body portion 81a is a plate-like member and has a rectangular shape in plan view. A rectangular through hole 81c is formed in the main surface of the main body portion 81a. Each protruding portion 81b is a plate-like member that is smaller than the main body portion 81a, and is erected from the center of the main surface of the main body portion 81a so as to sandwich the through hole 81c therebetween. The protruding portions 81b are spaced apart so as to face each other. The mutually opposing surfaces of each protruding portion 81b are substantially parallel.

  As shown in FIG. 12, the second piezoelectric actuator 82 b is a so-called multilayer piezoelectric actuator, and includes an element body 84, an external electrode 85, and a friction portion 86.

  The element body 84 is configured by alternately laminating a plurality of internal electrodes and ground internal electrodes with a piezoelectric layer interposed therebetween. Each internal electrode is comprised from the 1st-4th internal electrode. The first to fourth internal electrodes are arranged, for example, divided into four regions in a matrix form. The first and second internal electrodes are exposed on one side surface 84a orthogonal to the stacking direction of the element body 84, and the third and fourth internal electrodes are exposed on the other side surface 84b facing the one side surface 84a of the element body 84. ing. The ground internal electrode is exposed at least on the other side surface 84b.

  The external electrode 85 includes first and second external electrodes 85a and 85b and a ground external electrode 85c. The first external electrode 85 a is a belt-like electrode and is disposed around the element body 84. One end portion of the first external electrode 85 a is located on one side surface 84 a of the element body 84 and is connected to the first internal electrode exposed on one side in the stacking direction of the element body 84. The other end of the first external electrode 85a is located on the other side surface 84b of the element body 84, and is connected to the fourth internal electrode exposed on the other side in the stacking direction. That is, the first external electrode 85a is connected to the first and fourth internal electrodes.

  The second external electrode 85 b is a strip-shaped electrode and is disposed around the element body 84. One end of the second external electrode 85b is located on one side surface 84a of the element body 84 and is connected to the second internal electrode exposed on the other side in the stacking direction. The other end of the second external electrode 85b is located on the other side surface 84b of the element body 84, and is connected to the third internal electrode exposed on one side in the stacking direction. That is, the second external electrode 85b is connected to the second and third internal electrodes. The ground external electrode 85 c is connected to the ground internal electrode exposed on the other side surface 84 b of the element body 84.

  As shown in FIGS. 10 and 11, the element body 84 has active portions A1, A2, A3, and A4. The active part A1 includes a first internal electrode connected to the first external electrode 85a, a ground internal electrode, and a piezoelectric layer. The active part A2 includes a second internal electrode connected to the second external electrode 85b, a ground internal electrode, and a piezoelectric layer. The active part A3 includes a third internal electrode connected to the second external electrode 85b, a ground internal electrode, and a piezoelectric layer. The active part A4 includes a fourth internal electrode connected to the first external electrode 85a, a ground internal electrode, and a piezoelectric layer.

  As shown in FIG. 12, the friction portion 86 is disposed on one end face of the element body 84 in the stacking direction of the element bodies 84. The friction part 86 is located on the end face on the side close to the active parts A1 and A3. The friction part 86 protrudes in the stacking direction from the end face of the element body 84.

  In the second piezoelectric actuator 82b configured as described above, in the space formed between the protruding portions 81b of the holding member 81, the stacking direction of the element bodies 84 is substantially the same as the direction in which the protruding portions 81b face each other. They are arranged in an orthogonal direction.

  As shown in FIG. 12, the circuit board 83 is configured by, for example, an FPC (flexible print board). An end 83a of the circuit board 83 is inserted into a through hole 81c formed in the main body portion 81a of the holding member 81, and is connected to the external electrode 85 of the second piezoelectric actuator 82b. As a result, the circuit board 83 electrically connects the second piezoelectric actuator 82b and the main circuit board 4. The circuit board 83 has flexibility and follows the vibration of the second piezoelectric actuator 82b.

  As shown in FIG. 2, the first and second piezoelectric actuator units 80a and 80b configured as described above have two pairs of first and second pairs as viewed in the optical axis direction OA from the first drive unit 5 side. The second arm members 73 and 74 are disposed outside the second arm members 73 and 74, respectively. The first and second piezoelectric actuator units 80a and 80b are positioned so that the opposing direction of each protruding portion 81b of the holding member 81 is substantially parallel to the optical axis direction OA. The first and second piezoelectric actuators 82a and 82b and the protruding portions 81b of the holding member 81 are positioned between the two pairs of first and second arm members 73 and 74, respectively. The friction portions 86 of the first and second piezoelectric actuators 82a and 82b are in contact with the contact member 77 as shown in FIGS. The first and second piezoelectric actuators 82a and 82b are in contact with the protruding portions 72b of the column member 72 by end faces opposite to the end faces where the friction portions 86 are disposed. That is, the first piezoelectric actuator 82 a is positioned so as to contact the column member 72 and the first connecting member 75, and the second piezoelectric actuator 82 b is positioned so as to contact the column member 72 and the second connecting member 76. doing.

  As shown in FIG. 3, the lens driving device 1 further includes a pressing member 6. The pressing member 6 has a base portion 6a and a pair of side portions 6b. The base 6a is a plate-like member that has a rectangular shape in plan view. Each side portion 6b is erected from two sides of the base portion 6a so as to face each other. As shown in FIG. 2, the pressing member 6 is disposed outside the first corner portion 5 a so that the base portion 6 a overlaps the protrusion 66 a of the first portion 66 when viewed from the first drive portion 5 side in the optical axis direction OA. Has been. The pressing member 6 rotatably supports a projection 66a of the first portion 66 together with a conical groove (not shown) formed in the side wall 3b of the main base 3. Thereby, the projection 66 a of the first portion 66 constitutes the tilt center of the substrate 61.

  Next, the driving of the second driving unit 70 configured as described above will be described with reference to FIG. 13A and 13B show driving on the first piezoelectric actuator unit 80a side, and FIGS. 13C and 13D show driving on the second piezoelectric actuator unit 80b side.

  The second drive unit 70 has two resonance modes during driving. The second drive unit 70 includes a first vibration mode that vibrates in the width direction of the internal electrodes that constitute the first and second piezoelectric actuators 82a and 82b, and an internal electrode that constitutes the first and second piezoelectric actuators 82a and 82b. It vibrates by superposition with the second vibration mode that vibrates in the thickness direction.

  As shown in FIG. 13A, when the active parts A1 and A4 of the first piezoelectric actuator 82a are driven, the frictional force generated between the friction part 86 and the contact member 77 causes the first together with the contact member 77. The connecting member 75 moves to the main cover 2 side in the optical axis direction OA. As shown in FIG. 13B, when the active portions A <b> 2 and A <b> 3 of the first piezoelectric actuator 82 a are driven, a frictional force generated between the friction portion 86 and the contact member 77 causes the first contact with the contact member 77. The connecting member 75 moves to the main base 3 side in the optical axis direction OA.

  As shown in FIG. 13C, when the active portions A1 and A4 of the second piezoelectric actuator 82b are driven, the friction force generated between the friction portion 86 and the contact member 77 causes the second contact with the contact member 77. The connecting member 76 moves to the main cover 2 side in the optical axis direction OA. As shown in FIG. 13D, when the active portions A2 and A3 are driven, the second connecting member 76 together with the abutting member 77 is optically driven by the frictional force generated between the frictional portion 86 and the abutting member 77. It moves to the main base 3 side in the axial direction OA.

  Next, an example of driving for correcting camera shake in the lens driving device 1 configured as described above will be described with reference to FIGS. 14 to 17 are schematic views showing cross-sectional configurations of the IXA-IXA line and the IXB-IXB line in FIG. 14A to 17A show the cross-sectional configuration of the IXA-IXA line, and FIGS. 14B to 17B show the cross-sectional configuration of the IXB-IXB line.

  When shake occurs in the first drive unit 5 due to camera shake or the like, the shake detection sensor 63 detects the shake as angular velocity or angular acceleration, and a signal of the detection result is output to a control unit (not shown). When the control unit receives the signal, the control unit drives the second drive unit 70 based on the signal.

  As seen from the first drive unit 5 side in the optical axis direction OA, the first drive unit 5 swings with respect to an axis parallel to an imaginary line connecting the third and fourth corners 5c and 5d of the first drive unit 5. 14 and 15, the control unit causes the second drive unit 70 to move the second and third portions 67 and 68 in the same direction in the optical axis direction OA as shown in FIGS. 14 and 15. To control. More specifically, when the second corner portion 5b side of the first drive portion 5 swings closer to the main base 3 than the first corner portion 5a side, the second drive portion 70 is shown in FIG. In this manner, the second and third portions 67 and 68 are moved closer to the main cover 2. On the other hand, when the second corner 5b side of the first drive unit swings closer to the main cover 2 than the first corner 5a side, the second drive unit 70 is The second and third portions 67 and 68 are moved closer to the main base 3.

  On the other hand, when viewed in the optical axis direction OA from the first drive unit 5 side, the first drive unit is configured with respect to an axis parallel to an imaginary line connecting the first and second corners 5a and 5b of the first drive unit 5. 16 and FIG. 17, the control unit moves the second and third portions 67 and 68 in opposite directions to each other in the optical axis direction OA as shown in FIGS. The second drive unit 70 is controlled. More specifically, when the fourth square portion 5d side of the first drive portion 5 swings closer to the main cover 2 than the third triangular portion 5c side, the second drive portion 70 is as shown in FIG. The second portion 67 is moved closer to the main cover 2, and the third portion 68 is moved closer to the main base 3. On the other hand, when the side of the fourth square portion 5d of the first drive unit 5 is swung to the main base 3 side rather than the side of the third triangular portion 5c, the second drive unit 70, as shown in FIG. The second portion 67 is moved closer to the main base 3 and the third portion 68 is moved closer to the main cover 2.

  As described above, in the present embodiment, the first drive unit 5 is disposed and the image sensor 62 is placed by moving the second and third portions 67 and 68 along the optical axis direction OA. The tilt of the substrate 61 is changed. That is, the first portion 66 functions to constitute the tilt center of the substrate 61, and the substrate 61 tilts. Since the first to third portions 66, 67, 68 are located outside the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA, the optical axis direction OA of the lens drive device 1 is provided. Is difficult to be constrained by the size of the first to third portions 66, 67, 68 in the optical axis direction OA. As a result, enlargement of the lens driving device 1 in the optical axis direction OA is suppressed. Further, in the lens driving device 1, camera shake is corrected by changing the tilt of the substrate 61 on which the first driving unit 5 is disposed and the imaging element 62 is placed. That is, camera shake is corrected by a relatively simple configuration in which the second drive unit 70 changes the tilt of the substrate 61. Also in this respect, an increase in the size of the lens driving device 1 in the optical axis direction OA is suppressed.

  In the present embodiment, the lens driving device 1 is disposed on the opposite side to the first driving unit 5 with respect to the substrate 61, and when viewed from the first driving unit 5 side in the optical axis direction OA, the first driving unit 5 and the substrate 61. The main base 3 having an outer portion 3f located outside the second corner 5b is provided as a portion located outside the first corner 5b. The second drive unit 70 includes a column member 72 located on the outer portion 3 f of the main base 3. The second drive unit 70 is located outside the side 5e located between the second corner 5b and the triangular portion 5c in the outer shape of the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA. And a pair of first arm members 73 that are positioned along the side 5e, are pivotably connected to the column member 72, and are spaced apart from each other in the optical axis direction OA. The second drive unit 70 is located outside the third triangular portion 5c when viewed from the first drive unit 5 side in the optical axis direction OA, and is connected to each first arm member 73 and the projection 67a of the second portion 67 is provided. It has the V groove 75a of the 1st connection member 75 to engage. The 2nd drive part 70 is located between each 1st arm members 73 so that it may contact | abut to the pillar member 72 and the 1st connection member 75, and moves the 1st connection member 75 along the optical axis direction OA. A first piezoelectric actuator 82a is provided. The second drive unit 70 has a side 5f located between the second corner 5b and the fourth corner 5d in the outer shape of the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA. A pair of second arm members 74 are provided on the outer side and along the side 5f. The pair of second arm members 74 are coupled to the column member 72 so as to be swingable and are spaced apart from each other in the optical axis direction OA. The second drive unit 70 is located outside the fourth square portion 5d when viewed from the first drive unit 5 side in the optical axis direction OA, is connected to each second arm member 74, and has a protrusion 68a of the third portion 68. Has a rectangular groove 76a of the second connecting member 76 to be engaged. The 2nd drive part 70 is located between each 2nd arm member 74 so that it may contact | abut to the pillar member 72 and the 2nd connection member 76, and moves the 2nd connection member 76 along the optical axis direction OA. A second piezoelectric actuator 82b is provided. Thus, the column member 72, the two pairs of first and second arm members 73 and 74, the first and second connecting members 75 and 76, and the first and second piezoelectric actuators 82a and 82b are provided. Since the second drive unit 70 is located outside the first drive unit 5 when viewed from the first drive unit 5 side in the optical axis direction OA, the enlargement of the lens drive device 1 in the optical axis direction OA is further suppressed. The In addition, since the first and second piezoelectric actuators 82a and 82b, which are relatively compact actuators among the actuators, are used, the configuration for further suppressing the enlargement of the lens driving device 1 in the optical axis direction OA can be simplified. Can be realized. The first arm member 73 is positioned along the side 5e located between the second corner portion 5b and the third triangular portion 5c, and the second arm member 74 is positioned between the second corner portion 5b and the fourth corner portion 5d. It is located along the side 5f located between the two. Thereby, the enlargement of the lens drive device 1 in the surface direction orthogonal to the optical axis direction OA is also suppressed.

  In the present embodiment, the substrate 61 has protrusions 67a and 68a protruding in the optical axis direction OA at the second and third portions 67 and 68, and the first and second connecting members 75 and 76 are the protrusions 67a and 68a. Has a pair of V-grooves 75a and a pair of rectangular grooves 76a. Thereby, engagement with the 2nd part 67 and the 1st connection member 75 and engagement with the 3rd part 68 and the 2nd connection member 76 are realizable by simple structure.

  In the present embodiment, the protrusion 67a in the second portion 67 has a spherical shape, and the groove in the first connecting member 75 is between the first corner portion 5a and the third triangular portion 5c in the outer shape of the first drive portion. Are a pair of V grooves 75a extending in a direction parallel to the side 5g. As a result, the spherical protrusion 67a and each V-groove 75a are in point contact, so that the spherical protrusion 67a and each V-groove 75a are located between the spherical protrusion 67a and each V-groove 75a as compared with the protrusion and groove engaged by line contact or surface contact. The generated frictional force is small. For this reason, since the spherical projection 67a smoothly moves in each V groove 75a along the direction parallel to the side 5g, the second portion 67 moves smoothly along the optical axis direction OA. As a result, variations in changing the tilt of the substrate 61 are suppressed, so that more stable camera shake correction can be realized.

  As mentioned above, although embodiment of this invention has been described, this invention is not necessarily limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the summary.

  In the present embodiment, the first connecting member 75 extends in a direction (y direction) parallel to the side 5g located between the first corner 5a and the third triangular portion 5c in the outer shape of the first drive unit 5. A pair of V grooves 75a is formed. For example, the groove may be a single V-groove so as to form a through-hole having a triangular cross section. In this case, the protrusion 67a of the second portion 67 and the V groove make point contact at a total of three locations. The groove may be, for example, a rectangular groove that makes point contact with the protrusion 67a of the second portion 67 in the direction (x direction) parallel to the optical axis direction OA and the side 5e. In the present embodiment, the V-groove 75a and the rectangular groove 76a penetrate the first and second connecting members 75 and 76, respectively. Not limited to this, the V-groove 75a and the rectangular groove 76a may be non-penetrating grooves.

  In the present embodiment, spherical projections are used as the projections 66a, 67a, 68a of the first to third portions 66, 67, 68. For example, a polyhedral protrusion may be used.

  In the present embodiment, the second and third portions 67 and 68 have projections 67a and 68a, and the first and second connecting members 75 and 76 have grooves with which the projections 67a and 68a engage. . For example, the second and third portions 67 and 68 may have grooves, and the first and second connecting members 75 and 76 may have protrusions that engage with the grooves, respectively. In addition, the second portion 67 and the first connecting member 75 are not limited to the protrusions and grooves, and any configuration may be used as long as one of the second portion 67 and the first connecting member 75 is engaged with the other in the plane direction parallel to the optical axis and the side 5e (x direction). . The third portion 68 and the second connecting member 76 may be configured so that one of them is engaged with the other in the optical axis direction OA.

  In the present embodiment, first and second piezoelectric actuators 82a and 82b that are in contact with the column member 72 and the first and second connecting members 75 and 76 are used. For example, a piezoelectric actuator that engages with the first and second connecting members 75 and 76 and expands and contracts in the optical axis direction OA may be used. That is, other actuators may be used as long as the second and third portions 67 and 68 can be moved along the optical axis direction OA.

  Moreover, in this embodiment, the movable part 71 formed integrally is used. For example, a parallel link mechanism may be used. That is, other configurations may be used as long as the second and second portions 67 and 68 can be moved along the optical axis direction OA.

  3 ... main base (base), 3f ... outer portion, 5 ... first drive unit, 5a ... first corner, 5b ... second corner, 5c ... third triangle, 5d ... fourth corner, 5e, 5f Reference numeral 30: Lens holder, 50: Actuator, 61: Substrate, 62: Image sensor, 66: First part, 67 ... Second part, 68 ... Third part, 66a, 67a, 68a ... Projection, 70 ... Second Drive part, 72 ... pillar member, 73 ... first arm member, 74 ... second arm member, 75 ... first connecting member, 75a ... V groove (groove), 76 ... second connecting member, 76a ... rectangular groove (groove) ), 82a ... first piezoelectric actuator, 82b ... second piezoelectric actuator, OA ... optical axis direction.

Claims (4)

  1. The first and second corner portions having a lens holder and an actuator for moving the lens holder in the optical axis direction of the lens held by the lens holder, and whose outer shapes viewed from the optical axis direction are diagonal to each other And a first drive unit having a rectangular shape having third and fourth corners diagonally located with respect to each other;
    A substrate on which an image sensor is placed so as to face the lens held by the lens holder, the first driving unit being disposed;
    A second drive unit that corrects camera shake by changing the tilt of the substrate,
    The substrate includes a first portion positioned so as to extend from the first corner portion as a portion positioned on the outer side of the first driving portion in the optical axis direction from the first driving portion side, and the third triangular portion. A second portion positioned to extend and a third portion positioned to extend from the fourth corner,
    The second driving unit is a lens driving device that changes the inclination of the substrate by moving the second and third portions along the optical axis direction.
  2. The second drive unit is disposed on the opposite side of the first drive unit with respect to the substrate, and is located on the outer side of the first drive unit and the substrate as viewed in the optical axis direction from the first drive unit side. Further comprising a base having at least an outer portion located outside the corner;
    The second drive unit is
    A pillar member located in the outer portion of the base;
    As seen from the first drive unit side in the optical axis direction, outside the side located between the second corner portion and the third triangular portion in the outer shape of the first drive unit and along the side. A pair of first arm members that are swingably connected to the column member and spaced apart from each other in the optical axis direction;
    A first connecting member that is located on the outer side of the third triangular portion as viewed in the optical axis direction from the first drive unit side, is connected to each of the first arm members, and engages with the second portion;
    A first piezoelectric actuator that is positioned between each of the first arm members so as to come into contact with the column member and the first connecting member, and moves the first connecting member along the optical axis direction;
    When viewed from the first drive unit side in the optical axis direction, outside the side located between the second corner and the fourth corner in the outer shape of the first drive unit and along the side A pair of second arm members that are positioned so as to be swingably coupled to the column member and spaced apart from each other in the optical axis direction;
    A second connecting member that is located on the outer side of the fourth corner portion when viewed in the optical axis direction from the first driving portion side, is connected to each of the second arm members, and engages with the third portion;
    A second piezoelectric actuator that is positioned between each of the second arm members so as to come into contact with the column member and the second connecting member and moves the second connecting member along the optical axis direction; The lens driving device according to claim 1, comprising:
  3. The substrate has a protrusion protruding in the optical axis direction in the second and third portions,
    The lens driving device according to claim 2, wherein each of the first and second connecting members has a groove with which the protrusion is engaged.
  4. The protrusions in the second part are spherical in shape,
    The groove in the first connecting member is a V-groove extending in a direction parallel to a side located between the first corner portion and the third triangular portion in the outer shape of the first drive portion. 4. The lens driving device according to 3.
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