JP2016105141A - Vibration-proof mechanism for imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and quickly perform initialization of a detection member for performing position detection of a vibration-proof optical element, in a vibration-proof mechanism for an imaging apparatus.SOLUTION: A driving force by an actuator is applied to a movable member for supporting the vibration-proof optical element, to perform an image blur suppression operation, according to a shake applied to an imaging optical system. Two detection members for detecting a positional change of the movable member in two different directions are provided. Two regulation surfaces which pass through a center of a reception part of each detection member and an optical axis of the vibration-proof optical element and are parallel with the optical axis intersect with each other in a non-orthogonal relationship formed by an acute intersection angle and an obtuse intersection angle. The movable member is moved along a center plane which passes through the center of the intersection angle on the acute angle side of the two regulation surfaces up to a mechanical movement end subjected to restriction by a movement restriction part, to perform calibration of the two detection members.SELECTED DRAWING: Figure 12

Description

  The present invention relates to an imaging apparatus provided with an image stabilization (image blur correction) mechanism.

  In recent years, portable electronic devices mainly for photographing such as digital still cameras and digital video cameras, and portable electronic devices having an incidental photographing function such as camera-equipped mobile phones and portable information terminals have been widely used. An image pickup apparatus mounted on such a device tends to require a so-called anti-vibration mechanism for reducing image shake on an image plane caused by vibration such as camera shake.

  In the anti-vibration mechanism, in order to control the operation of the anti-vibration optical element such as a lens and an image sensor, the position of the anti-vibration optical element is detected using a detection unit such as a sensor. For example, in the imaging apparatus of Patent Document 1, in a vibration isolation mechanism that uses a voice coil motor that generates a driving force by a permanent magnet and a coil as a driving source, the state of the magnetic field (magnetic flux density) detected by the magnetic sensor is converted into position information. doing.

  There are various known driving modes of the vibration isolating optical element in the vibration isolating mechanism, but the movement range of the movable member holding the vibration isolating optical element is limited by mechanical means, and deviates from the optical allowable range. It is common to restrict excessive movement. In the imaging apparatus of Patent Document 1, the magnetic sensor is calibrated (initialized) using such a mechanical moving end as a reference. More specifically, each voice coil motor includes two voice coil motors whose thrusts are perpendicular to each other, and two magnetic sensors for detecting a change in position in the two orthogonal axes corresponding thereto. Each magnetic sensor is calibrated by moving the movable member to the thrust moving direction, that is, to the mechanical moving end in the biaxial direction perpendicular to each other.

JP 2012-203082 A

  In order to speed up the start-up of the image pickup apparatus and the like, it is required to complete the start-up preparation as soon as possible in the image stabilization mechanism. SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration isolation mechanism for an imaging apparatus that can initialize a detection member more easily and quickly than in the past.

  The present invention has the following features in an image stabilization mechanism for an image pickup apparatus that causes an image stabilization optical element that constitutes the image pickup optical system to perform an image shake suppression operation in accordance with the shake applied to the image pickup optical system. The movable member holding the vibration isolating optical element is supported so as to be movable with a component in a direction perpendicular to the optical axis of the vibration isolating optical element with respect to the support member. A movement restricting portion for mechanically restricting is provided. A drive force is applied to the movable member by the actuator in accordance with the shake applied to the imaging optical system, and an image shake suppression operation is performed. A change in the position of the movable member in two different directions by the actuator is detected by the two detection members. Two defined planes that pass through the center of the sensing part of the two detection members and the optical axis of the anti-vibration optical element and are parallel to the optical axis intersect with each other in a non-orthogonal relationship including an acute angle and an obtuse angle. . The two detection members are calibrated by moving the movable member along the central plane passing through the center of the intersection angle on the acute angle side of the two defining surfaces to the moving end subjected to the restriction by the movement restricting unit.

  The actuator can be two voice coil motors, each of which is composed of a permanent magnet and a coil, and is provided with different positions in the circumferential direction around the optical axis of the vibration-proof optical element. The two detection members are two magnetic sensors provided at different positions in the circumferential direction around the optical axis of the vibration-proof optical element. Then, two permanent magnets are supported on one of the movable member and the support member, and two coils and two magnetic sensors are supported on the other of the movable member and the support member.

  In an anti-vibration mechanism of the type in which the movable member is supported with respect to the support member so as to be capable of pivoting around the center of oscillation located on the extension of the optical axis of the anti-vibration optical element, Four protrusions provided at substantially equal intervals in the circumferential direction around the optical axis of the vibration isolating optical element and a position surrounding the peripheral edge of the movable member on the support member. It is preferable that the movement restricting portion is constituted by the four contact surfaces in contact with each other.

  In the ball center swing type vibration-proof mechanism, one of the two voice coil motors is directed along the tangential plane of the spherical surface centered on the swing center point and along one of the two specified surfaces by energizing the coil. The other of the two voice coil motors generates a thrust along the tangential plane of the spherical surface centered on the oscillation center point and along the other of the two prescribed surfaces by energizing the coil. Then, one of the two voice coil motors, one of the two magnetic sensors, the other of the two voice coil motors, and the other of the two magnetic sensors are each in the radial direction of the spherical surface centered on the oscillation center point. It is preferable to arrange them side by side.

  In a vibration isolating mechanism of a type in which the movable member is moved relative to the support member along a plane perpendicular to the optical axis of the anti-vibration optical element, it is provided on one of the support member and the movable member and is aligned with the optical axis of the anti-vibration optical element. It is preferable that the movement restricting portion is constituted by the protrusion protruding in the direction along the inner surface of the hole formed in the other of the support member and the movable member and inserted in the protrusion.

  In an anti-vibration mechanism of the type that moves along a plane perpendicular to the optical axis of the anti-vibration optical element, one of the two voice coil motors follows a plane perpendicular to the optical axis of the anti-optical element by energizing the coil. And the other of the two voice coil motors, along the plane perpendicular to the optical axis of the prevention optical element, and the other of the two prescribed surfaces by energization of the coil. The vibration isolating optical element is configured such that one of the two voice coil motors and one of the two magnetic sensors are connected to the other of the two voice coil motors and the other of the two magnetic sensors. It is preferable to arrange them in a direction parallel to the optical axis.

  In an optical system having a reflective optical element that reflects a light beam that has passed through an anti-vibration optical element, the center plane that determines the movement of the movable member during calibration of the detection member has an optical axis after bending along the light beam reflected by the reflective optical element. It can be set as a containing surface.

  According to the present invention, the movable member is only moved along a central plane passing through the center of the intersection angle on the acute angle side of the two defined surfaces determined by the center of the sensing part of the two detection members and the optical axis of the vibration-proof optical element. Thus, the two detection members can be calibrated easily and quickly, and the waiting time at the time of starting up the imaging apparatus can be shortened as compared with the conventional case.

It is a front perspective view which shows the external appearance of the imaging unit provided with the anti-vibration mechanism of 1st Embodiment to which this invention is applied. It is the top view which looked at the same imaging unit from the photographic subject side. It is sectional drawing which showed the optical system of the imaging unit along the cross section containing a 1st optical axis, a 2nd optical axis, and a 3rd optical axis. It is sectional drawing which follows the IV-IV line of FIG. It is the disassembled perspective view which looked at the image pick-up unit from diagonally forward in the state which decomposed | disassembled the anti-vibration mechanism of 1st Embodiment. It is the disassembled perspective view which looked at the image pick-up unit from diagonally back in the state which decomposed | disassembled the anti-vibration mechanism of 1st Embodiment. It is a front perspective view of the state which combined the 1st lens frame and sensor holder which constitute the vibration proof mechanism of a 1st embodiment. It is the figure which looked at the state which combined the 1st lens frame and the sensor holder from the left of the imaging unit. It is a front perspective view of the sensor holder. It is the figure which looked at the sensor holder from the front of an imaging unit. It is the figure which looked at the 1st lens frame and a coil from the front of an imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the back of an imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the right side of an imaging unit. It is the figure which looked at the 1st lens frame and the cover member from the front of an image pick-up unit. It is the figure which looked at the 1st lens frame, a cover member, and a hall sensor from the back of an imaging unit. It is the figure which looked at the 1st lens frame, a cover member, and a hall sensor from the right side of an imaging unit. It is sectional drawing which follows the XVII-XVII line of FIG. It is sectional drawing which follows the XVIII-XVIII line of FIG. It is a block diagram which shows notionally the principal part of the electrical equipment system of an imaging unit. It is a graph which shows the output of two Hall sensors when a 1st lens frame is driven along two reference planes with the anti-vibration mechanism of 1st Embodiment. It is the figure which looked at the 1st lens frame and coil which comprise the anti-vibration mechanism of 2nd Embodiment from the front of the imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the back of an imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the right side of an imaging unit. It is a front perspective view of the type of vibration isolating mechanism that moves the first lens along a plane perpendicular to the optical axis. It is the front perspective view which looked at the vibration isolating mechanism from the angle different from FIG. It is a rear perspective view of the vibration isolating mechanism. It is the back perspective view which looked at the vibration isolator from the angle different from FIG. It is the figure which looked at the vibration isolating mechanism from the front of the imaging unit. It is the figure which looked at the vibration isolating mechanism from the left of an imaging unit. It is the figure which looked at the vibration isolating mechanism from the right side of an imaging unit. It is the figure which looked at the vibration isolating mechanism from the lower part of an imaging unit. It is the figure which looked at the 1st lens frame, coil, and Hall sensor which comprise the vibration isolating mechanism from the back of an imaging unit. It is a disassembled perspective view of the vibration isolating mechanism. It is the figure which looked at the 1st lens frame and coil which comprise the anti-vibration mechanism of 3rd Embodiment from the front of the imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the back of an imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the right side of an imaging unit. It is the figure which looked at the 1st lens frame and coil which comprise the anti-vibration mechanism of 4th Embodiment from the front of the imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the back of an imaging unit. It is the figure which looked at the 1st lens frame, a coil, and a hall sensor from the right side of an imaging unit.

  An imaging unit (imaging device) 10 according to a first embodiment of the present invention will be described with reference to FIGS. In the following description, the front, rear, left, and right directions are based on the arrow direction shown in the figure, and the subject (object) side is the front. As shown in FIG. 1 and FIG. 2, the imaging unit 10 has a horizontally long shape that is thin in the front-rear direction and long in the left-right direction.

  As shown in FIG. 3, the imaging optical system of the imaging unit 10 includes a first group G1, a second group G2, a third group G3, and a fourth group G4, and includes a first prism ( The reflecting optical element) L11 and the second prism L12 located on the right side (image side) of the fourth group G4 constitute a bending optical system that reflects the light beam substantially at right angles. The first prism L11 includes an entrance surface L11-a facing forward, an exit surface L11-b facing right, and a reflective surface L11-c obliquely provided with respect to the entrance surface L11-a and the exit surface L11-b. have. As shown in FIGS. 3 and 4, the first group G1 includes a first lens (anti-vibration optical element) L1 positioned in front of the incident surface L11-a of the first prism L11 (subject side), and the first prism. L11 and a second lens L2 located on the right side (image side) of the emission surface L11-b of the first prism L11. The first lens L1 is a single lens with the incident surface L1-a facing the object side and the exit surface L1-b facing the incident surface L11-a of the first prism L11. The second group G2 to the fourth group G4 are each a lens group that does not include a reflecting element such as a prism.

  As shown in FIG. 3, the light beam from the subject incident on the first lens L1 along the first optical axis (optical axis of the image stabilizing optical element) O1 from the front to the rear is first through the incident surface L11-a. The light enters the prism L11, is reflected by the reflecting surface L11-c of the first prism L11 in the direction (left to right) along the second optical axis (post-bending optical axis) O2, and is emitted from the emitting surface L11-b. . Subsequently, the light beam passes through the second lens L2 located on the second optical axis O2 and the respective lenses from the second group G2 to the fourth group G4, enters the second prism L12 through the incident surface L12-a, and enters the second prism L12. Reflected in the direction along the third optical axis O3 (the direction from the rear to the front) by the reflecting surface L12-c of the prism L12, emitted from the emitting surface L12-b, and imaged on the imaging surface of the imaging sensor 14. . A signal photoelectrically converted by the imaging sensor 14 is sent to the control unit 89 (FIG. 19) of the imaging unit 10 and processed by an image processing circuit of the control unit 89 to generate image data. The first optical axis O1 and the third optical axis O3 are substantially parallel, and are located in the same plane together with the second optical axis O2. The imaging unit 10 has a shape that is long in the direction along the second optical axis O2, and the first group G1 is disposed close to a longitudinal end of the imaging unit 10 (the left end). .

  A virtual plane including the first optical axis O1, the second optical axis O2, and the third optical axis O3 is defined as a reference plane P1, and a virtual plane including the first optical axis O1 orthogonal to the reference plane P1 is defined as the reference plane P2. And In the imaging unit 10 of the first embodiment, the reference plane P1 is shown in FIGS. 2, 8, 10 to 16, and 18, and FIGS. 2, 4, 10 to 12, 14, 15, and 15. FIG. 17 shows the reference plane P2.

  The first lens L1 has a light incident surface L1-a facing the subject side as a flat surface, a light exit surface L1-b facing the first prism L11 as a concave surface, and a part of the peripheral edge on the side where the second optical axis O2 extends. It has a D-cut shape cut out in a direction along the reference plane P2. The entrance surface L11-a and the exit surface L11-b of the first prism L11 are substantially perpendicular to each other, and the reflection surface L11-c is at an angle of about 45 degrees with respect to the entrance surface L11-a and the exit surface L11-b. It is obliquely installed. Similar to the first prism L11, the incident surface L12-a and the exit surface L12-b of the second prism L12 are substantially perpendicular to each other, and the reflective surface L12-c is formed on the entrance surface L12-a and the exit surface L12-b. In contrast, it is inclined at an angle of about 45 degrees.

  The imaging unit 10 has a housing (support member) 20. The housing 20 includes a box-shaped portion 22 opened rearward, a first support portion 23 positioned on the left side of the box-shaped portion 22, and a second support portion 24 positioned on the right side of the box-shaped portion 22. The rear portion of the housing 20 is closed by the rear support plate 21. Although not shown, a lens frame that holds the second group G2 and a lens frame that holds the third group G3 are supported inside the box-shaped portion 22. A prism holding frame 23a and a prism holding frame 24a are formed on the first support portion 23 and the second support portion 24, the first prism L11 is supported on the prism holding frame 23a, and the second prism L12 is supported on the prism holding frame 24a. Is supported. Further, the second lens L2 of the first group G1 is fixedly supported by the first support part 23, and the fourth group G4 is fixedly supported by the second support part 24. An imaging sensor substrate 15 (FIG. 3) that supports the imaging sensor 14 is fixed in an opening formed in front of the prism holding frame 24a of the second support portion 24. An assembly opening 21 a (FIG. 6) is formed in the rear support plate 21 at a rear position of the first support portion 23 of the housing 20.

  A lens frame (not shown) that holds the second group G2 and a lens frame (not shown) that holds the third group G3 are each supported in the box-like portion 22 so as to be able to move straight along the second optical axis O2. Each lens frame moves forward and backward along the second optical axis O2 by the driving force of the two lens driving motors M (FIGS. 1, 2, 6, and 19) supported by the second support portion 24. The lens drive motor M is driven and controlled via a motor driver included in the control unit 89 (FIG. 19). The imaging optical system of the imaging unit 10 has a variable focal length, and a zooming operation is performed by movement of the second group G2 and the third group G3 along the second optical axis O2. Further, the focusing operation is performed by the movement of the third group G3 along the second optical axis O2.

  The imaging unit 10 includes an anti-shake (image shake correction) mechanism 13 that reduces image shake on the image plane caused by vibration such as camera shake. This anti-vibration mechanism 13 centers the first lens L1 in the first group G1 on a swing center (swing center point) A1 (FIG. 4) that is a point on the axis extending the first optical axis O1. It swings along a virtual spherical surface. This swinging motion in the first lens L1 is called a ball center swing. The first optical axis O1 in the figure indicates the optical axis of the first lens L1 in the optical design reference state (the center position of the pivoting of the spherical center) where the image stabilization operation is not performed. Hereinafter, the reference state of the first lens L1 is referred to as an image stabilization initial position.

  The first lens L1 is fixedly supported by a first lens frame (movable member) 30, and the first lens frame 30 is supported by a sensor holder (support member) 31 so as to be capable of pivoting on a spherical center. 31 is fixedly supported with respect to the first support portion 23 of the housing 20. A cover member (support member) 32 having a shape surrounding the first lens frame 30 is further attached to the first support portion 23 of the housing 20. A pair of permanent magnets 81 and 82 (FIGS. 5 to 8 and 11) supported by the first lens frame 30 and a pair of coils 83 and 84 (FIGS. 5, 6, and 11) supported by the cover member 32. 16 and FIG. 19) constitute an electromagnetic actuator (two voice coil motors) that drives the first lens frame 30 (first lens L1). The position of the first lens frame 30 (first lens L1) driven by this electromagnetic actuator is detected by a pair of Hall sensors (detection members, magnetic sensors) 85 and 86 (FIGS. 5 to 10) supported by the sensor holder 31. 12, FIG. 13, FIG. 15 to FIG. 17, FIG. 19).

  Each of the permanent magnet 81 and the permanent magnet 82 is a flat rectangular parallelepiped, and the shape and size of each other are substantially the same. Each of the permanent magnets 81 and 82 has an N pole on one side across the magnetic pole boundary lines Q1 and Q2 shown in FIGS. 7, 8, and 11, and an S pole on the other side. In the figure, the magnetic pole boundary lines Q1 and Q2 are shown. However, since the permanent magnets 81 and 82 have a thickness, the actual boundary between the N pole and the S pole is the magnetic pole boundary lines Q1 and Q2 as the permanent magnet 81, It becomes a virtual surface formed continuously in the thickness direction of 82. The coil 83 and the coil 84 are elongated air core coils each having a pair of substantially parallel long side portions 83a and 84a and a pair of curved portions 83b and 84b connecting the pair of long side portions 83a and 84a. Compared with the size in the longitudinal direction in which the pair of long sides 83a, 84a extends and the size in the width direction that crosses the pair of long sides 83a, 84a, the thickness in the direction through which the air core portion penetrates is small and thin. It is a flat coil. The extending direction of the magnetic pole boundary line Q1 of the permanent magnet 81 and the pair of long side portions 83a of the coil 83 is substantially parallel, and the extending direction of the magnetic pole boundary line Q2 of the permanent magnet 82 and the pair of long side portions 84a of the coil 84 is It is almost parallel. The shape and size of the coil 83 and the coil 84 are substantially the same. The coil 83 and the coil 84 are supported by coil support members 87 and 88 (FIGS. 1, 2, 5, and 6), respectively.

  The first lens frame 30 includes a frame-shaped lens holding portion 40 that fits and fixes the first lens L1 therein, a support portion 41, and a pair of magnet holding portions 42 and 43. The support 41 and the magnet holders 42 and 43 are both positioned on the left side of the reference plane P2 (on the opposite side to the traveling direction of the reflected light beam along the second optical axis O2). Connected. The magnet holders 42 and 43 have different positions in the circumferential direction of the lens holder 40 around the first optical axis O1. The support portion 41 includes a rear extending portion 41a extending rearward from a circumferential position between the magnet holding portion 42 and the magnet holding portion 43 in the lens holding portion 40, and a reference from the vicinity of the rear end of the rear extending portion 41a. A cantilevered pivot arm 41b is provided extending in a direction approaching the plane P2 (first optical axis O1). The extending direction (left-right direction) of the pivot arm 41b is substantially perpendicular to the extending direction (front-rear direction) of the rear extension 41a. In the side cross section along the reference plane P1 as shown in FIG. The support portion 41 has a substantially L-shape formed by the rear extension portion 41a and the pivot arm 41b. At the tip of the pivot arm 41b, a pivot convex portion 44 that protrudes rearward is formed. The pivot convex portion 44 is a tapered conical body having a diameter that decreases toward the rear, and has a smooth spherical tip (convex spherical surface). A curved surface 41c is further formed at the front end of the pivot arm 41b on the front side opposite to the protruding direction of the pivot convex portion 44. The curved surface 41c is formed as a spherical surface that protrudes forward, and the center of the spherical surface including the curved surface 41b coincides with the swing center A1.

  The magnet holding part 42 and the magnet holding part 43 of the first lens frame 30 are formed so as to protrude obliquely rearward from the lens holding part 40, and the first lens frame 30 moves away from the lens holding part 40 toward the front end side (rear). It is inclined to increase the distance from one optical axis O1. In a state where the first lens frame 30 is at the initial position for image stabilization, the magnet holder 42 and the magnet holder 43 are in a substantially symmetrical positional relationship across the reference plane P1. The permanent magnet 81 is fitted and held in the recess formed in the magnet holding portion 42, and the permanent magnet 82 is fitted and held in the recess formed in the magnet holding portion 43. The magnet holding part 42 and the magnet holding part 43 are each formed as a rectangular frame-like part surrounding the permanent magnet 81 and the permanent magnet 82 to be held.

  The first lens frame 30 further has a guide portion 45 at the rear end portion (near the base portion of the pivot arm 41b) of the rear extension portion 41a in the support portion 41. As shown in FIGS. 5 to 8, 12, 13, 15, 16, and 17, the guide portion 45 has a groove portion that is opened rearward, and the pair of opposing surfaces 45 a are groove portions. It constitutes the wall on both sides. The pair of facing surfaces 45a are substantially parallel to each other, and the pair of facing surfaces 45a are positioned substantially symmetrically across the reference plane P1 in a state where the first lens frame 30 is at the image stabilization initial position. As shown in FIG. 17, the pivot convex portion 44 and the guide portion 45 are provided at substantially the same position in the front-rear direction.

  In the first prism L11 held by the prism holding frame 23a of the housing 20, the incident surface L11-a is located on the first optical axis O1 and faces forward, and the emission surface L11-b is on the second optical axis O2. Locate and turn right. The housing 20 has insertion spaces 23b on the left and rear sides of the prism holding frame 23a. As shown in FIGS. 5 and 6, a pair of support seats 25 project rearward from the prism holding frame 23 a, and the front ends (ends facing rearward) of the respective support seats 25 are located more than the support seats 25. Further, a cylindrical extension protrusion 26 protruding rearward is provided. The pair of support seats 25 and the pair of extended protrusions 26 are disposed in a substantially symmetrical positional relationship in one and the other region across the reference plane P1. A screw hole 25 a (FIG. 6) whose axis is directed in the front-rear direction is formed inside each support seat 25, and this screw hole 25 a opens at the end face of the extension protrusion 26. In addition to the support seat 25 and the extended protrusion 26, a spring support protrusion 27 is provided so as to protrude rearward from the prism holding frame 23a (FIGS. 4 to 6). The spring support protrusion 27 and the urging arm support protrusion 28 are located on the reference plane P1.

  As shown in FIGS. 4 to 6, a biasing arm 36 and a coil spring 37 are provided in the insertion space 23 b of the housing 20. The urging arm 36 has a pressing step portion 36b at one end of a support plate portion 36a bent in an L shape, and is engaged with an engagement hole 36c on two substantially orthogonal surfaces of the support plate portion 36a. A hole 36d is formed. A bent support portion 36e is formed at the end of the support plate portion 36a opposite to the pressing step portion 36b. The urging arm support protrusion 28 is inserted into the engagement hole 36c, the support protrusion 27 is inserted into the engagement hole 36d, and the bending support portion 36e is engaged with the urging arm support protrusion 28, thereby urging the arm. 36 is supported by the housing 20. Prior to assembly of the urging arm 36, when the coil spring 37 is inserted outside the spring support protrusion 27 and the urging arm 36 is assembled to the housing 20, one end of the coil spring 37 with its axis line in the front-rear direction is connected to the prism holding frame 23a. And the other end of the coil spring 37 is in contact with the support plate 36a. The urging arm 36 is supported with respect to the housing 20 so as to be able to oscillate around the engaging portion of the bending support portion 36e and the urging arm support projection 28, and the position of the pressing step portion 36b in the front-rear direction is supported by this oscillation. Can be changed. Due to the urging force of the coil spring 37, the urging arm 36 is urged in the direction of pushing the pressing step 36c backward.

  As shown in FIGS. 9 and 10, the sensor holder 31 includes a base plate portion 60 and a pair of sensor support protrusions 61 and 62 that are formed to protrude forward from the base plate portion 60. When the sensor holder 31 and the first lens frame 30 are combined as shown in FIGS. 7 and 8, the sensor support protrusion 61 and the sensor support protrusion 62 are respectively a magnet holding portion 42 and a magnet holding portion 43 of the first lens frame 30. The Hall sensor 85 and the Hall sensor 86 are fitted and supported in the recesses on the inclined surface. The hall sensor 85 and the hall sensor 86 are electrically connected to the control unit 89 (FIG. 19), and output information of the hall sensor 85 and the hall sensor 86 is transmitted to the control unit 89.

  In the base plate portion 60 of the sensor holder 31, a pair of attachment portions 63 attached to the pair of support seats 25 of the housing 20, a circular loose fitting hole 64 formed through each attachment portion 63 in the front-rear direction, A pivot recess 65 and a rotation restricting projection 66 are formed between the pair of attachment portions 63.

  The pivot recess 65 is a recess having a bowl-shaped inner surface into which the pivot convex portion 44 of the first lens frame 30 can be fitted, and the deepest bottom portion has a spherical shape (concave shape) corresponding to the tip shape of the pivot convex portion 44. Sphere). The rotation restricting projection 66 is a rod-like projection formed at a position eccentric to the left with respect to the pivot recess 65 with the axis (longitudinal direction) in the radial direction of the pivot recess 65. The rotation restricting projection 66 has substantially the same cross-sectional shape at any position in the axial direction, and the guide of the first lens frame 30 with the pivot convex portion 44 fitted in the pivot concave portion 65 as shown in FIG. The rotation restricting projection 66 is inserted between the pair of opposed surfaces 45a of the portion 45 (FIGS. 7 and 8). The guide portion 45 is capable of relative movement (sliding) in the direction along the reference plane P1 (the left-right direction and the front-rear direction of the imaging unit 10) with respect to the rotation restricting protrusion 66, and the direction connecting the pair of opposed surfaces 45a. Relative movement in the (up and down direction of the imaging unit 10) is restricted.

  As shown in FIGS. 5 and 6, the sensor holder 31 has an insertion space for the first support portion 23 from the rear to the front with the front surfaces of the pair of attachment portions 63 opposed to the pair of support seats 25 of the housing 20. 23b is inserted. When the sensor holder 31 is inserted into the insertion space 23b through the assembly opening 21a of the rear support plate 21, the extended protrusions 26 provided at the tips of the pair of support seats 25 enter the corresponding loose fitting holes 64, respectively. To do. When the sensor holder 31 is inserted forward until the front surfaces of the pair of mounting portions 63 come into contact with the tips of the pair of support seats 25, further forward movement (insertion) of the sensor holder 31 is restricted. That is, the position of the sensor holder 31 in the direction along the first optical axis O1 (the front-rear direction of the imaging unit 10) is determined. The pair of loose fitting holes 64 and the pair of extended projecting portions 26 are each set to have a diameter so as to be loosely fitted with a predetermined gap in the radial direction, and the fixed portion 63 with respect to the distal ends of the pair of support seats 25. When the sensor holder 31 is merely applied, the sensor holder 31 is within the range allowed by the clearance between the inner edge of each loose fitting hole 64 and the outer peripheral surface of each extended protrusion 26 with respect to the housing 20. Movement along a plane perpendicular to the optical axis O1 is possible.

  The sensor holder 31 is mounted in the insertion space 23b of the housing 20 using a pair of mounting screws 67 shown in FIGS. The mounting screw 67 has a shaft portion 67a having a thread (male thread) formed on the outer peripheral surface, and a head portion 67b that is provided at one end of the shaft portion 67a and has a larger diameter than the shaft portion 67a. An annular washer 68 is supported on the surface on which the shaft portion 67a projects. The washer 68 has a larger diameter than the head 67b. The shaft portion 67a of the mounting screw 67 is screwed into the screw hole 25a formed inside each support seat 25 from the rear, and the mounting portion 63 is sandwiched between the washer 68 and the support seat 25, thereby housing. The sensor holder 31 is supported in the 20 insertion spaces 23b. In the support state of the sensor holder 31, the sensor support protrusion 61 and the sensor support protrusion 62 are located on the left side of the prism holding frame 23a, and the base plate portion 60 is located behind the prism holding frame 23a. The pivot recess 65 formed in the above is positioned on the extension of the first optical axis O1 (FIG. 4). The rotation restricting projection 66 is located on the left side of the pivot recess 65 at a position overlapping the reference plane P1. The sensor holder 31 is fixed to the housing 20 after adjusting the position with respect to the first support portion 23 as necessary. The sensor holder 31 can be fixed by a technique such as adhesion or fastening of the mounting screw 67.

  The first lens frame 30 is supported via the sensor holder 31. As shown in FIG. 4, in the first lens frame 30, the support portion 41 is inserted into the insertion space 23b so that the pivot arm 41b is positioned between the prism holding frame 23a of the housing 20 and the base plate portion 60 of the sensor holder 31. Inserted in. In the first lens frame 30, the pivot convex portion 44 provided on the pivot arm 41 b is inserted into the pivot concave portion 65 of the sensor holder 31 with respect to the sensor holder 31, and the rotation restricting projection 66 is inserted into the guide portion 45. Supported. In this supported state, the curved surface 41c of the pivot arm 41b opposite to the pivot convex portion 44 is in contact with the surface facing the rear side of the pressing step portion 36b of the urging arm 36, and the curved surface 41c is attached to the coil spring 37. The urging arm 36 is pushed forward against the force. Then, the curved surface 41 c is pressed backward by the urging arm 36 that receives the repulsive force of the coil spring 37, and the tip of the pivot convex portion 44 is pressed against the bottom portion of the pivot concave portion 65. As a result, the first lens frame 30 is stably supported with respect to the sensor holder 31 while being able to swing the ball. With the first lens frame 30 supported, the first lens L1 is positioned in front of the incident surface L11-a of the first prism L11. Further, as shown in FIGS. 7 and 8, the magnet holding part 42 is positioned adjacent to the sensor support protrusion 61 of the sensor holder 31, and the magnet holding part 43 is positioned adjacent to the sensor support protrusion 62 of the sensor holder 31. The hall sensor 85 faces the magnet holding portion 42, and the hall sensor 86 faces the magnet holding portion 43 (FIGS. 12, 13, and 15 to 17).

  As an order of assembling the first lens frame 30 and the sensor holder 31 with respect to the housing 20, the first lens frame 30 is first inserted from the front with respect to the first support portion 23 of the housing 20, and then the sensor holder. 31 may be assembled from the rear and fastened with the mounting screw 67.

  As shown in FIGS. 1, 2, 5, 6, and 14 to 18, the cover member 32 has a shape that covers the first support portion 23 of the housing 20 from the front, and the first support portion 23. Side wall 70 that covers the three surfaces of the upper side, the lower side, and the left side, and a front wall 71 that covers the front surface of the first support portion 23. The front wall 71 is formed with a photographing opening 72 that exposes the first lens L1. A plurality of engagement holes 73 are formed in the side wall 70, and a plurality of engagement holes 74 are formed in the front wall 71. The first support portion 23 of the housing 20 includes a plurality of engagement protrusions 23 c that engage with the plurality of engagement holes 73 and a plurality of engagement protrusions 23 d that engage with the plurality of engagement holes 74. The cover member 32 is placed on the first support portion 23 and the engagement holes 73 and 74 are engaged with the engagement protrusions 23c and 23d, so that the cover member 32 is fixedly supported by the housing 20. The

  Two coil attachment portions 75 are formed at the boundary portion between the side wall 70 and the front wall 71 of the cover member 32. As shown in FIGS. 5 and 14 to 17, each coil mounting portion 75 is formed with a through-hole that communicates the inside and outside of the cover member 32. The coil support member 87 and the coil support member 88 are attached to the two coil attachment portions 75, and the coil 83 and the coil 84 are inserted into the through holes formed in the coil attachment portions 75. FIG. 14 shows the relationship between the coil attachment portion 75 and the coils 83 and 84 in a state where the coil support member 87 and the coil support member 88 are omitted. In a state where the cover member 32 is assembled to the housing 20, the coil 83 faces the permanent magnet 81, and the coil 84 faces the permanent magnet 82 (FIGS. 11 to 13, 15, and 16). Energization of the coil 83 and the coil 84 is controlled by the control unit 89 (FIG. 19).

  As shown in FIGS. 2, 4 to 8, and 11 to 18, the outer periphery of the first lens frame 30 has a substantially equal interval (90 ° interval) in the circumferential direction around the first optical axis O <b> 1. Thus, four position restricting protrusions (movement restricting portions, projecting portions) 46 are provided. The four position restriction protrusions 46 protrude toward the left, right, upper, and lower sides of the first lens frame 30, respectively, and in the following description, those that face the left are positioned restriction protrusions 46L, Those facing right are called position restriction protrusions 46R, those facing upward are called position restriction protrusions 46U, and those facing downward are called position restriction protrusions 46D. When the first lens frame 30 is in the image stabilization initial position, the pair of position limiting projections 46L and 46R aligned in the left-right direction are positioned on the reference plane P1, and the pair of position limiting projections 46U and 46D aligned in the vertical direction are the reference plane. Located on P2.

  As shown in FIGS. 1, 4 to 6, and FIGS. 15 to 18, the cover member 32 has an inner side 4 facing the four position restriction protrusions 46 of the first lens frame 30 in a state of being assembled to the housing 20. Two position limiting surfaces (movement limiting portions, contact surfaces) 76 are formed. The four position limiting surfaces 76 are a position limiting surface 76L positioned on the left side of the first lens frame 30, a position limiting surface 76R positioned on the right side, a position limiting surface 76U positioned above, and a position limiting surface positioned below. A pair of position limiting surfaces 76L arranged in the left-right direction are arranged at substantially equal intervals (90 ° intervals) in the circumferential direction around the first optical axis O1 like the four position limiting projections 46. 76R is positioned on the reference plane P1, and a pair of position limiting surfaces 76U and 76D arranged in the vertical direction are positioned on the reference plane P2. The position limiting surface 76L is formed on the inner surface (the surface facing right) of the left side wall 70 of the cover member 32. The position limiting surface 76U and the position limiting surface 76D are respectively formed on end surfaces of ribs that protrude from the inner surfaces of the upper and lower side walls 70 in a direction approaching the first optical axis O1. The position limiting surface 76 </ b> R is formed on the inner peripheral portion of the front wall 71 of the cover member 32 that faces the photographing opening 72.

  When the first lens frame 30 swings in the ball center, the position limit protrusion 46 abuts on the position limit surface 76b that is in a facing relationship, so that further swing is limited. As shown in FIGS. 11, 12, and 15, each of the four position limiting protrusions 46 has a curved surface that is convex toward the outer diameter direction of the first lens frame 30, and has four position limiting surfaces. Each of 76 is formed as a concave curved surface. The vicinity of the front end of each position limiting protrusion 46 is formed in a hemispherical shape (a part of a spherical surface) (see FIGS. 4, 7, 8, 11, 13, 16 to 18), and the first lens frame. When restricting the swing of the 30 ball centers, the hemispherical portion in the vicinity of the front end of the position restricting projection 46 is brought into contact with the concave position restricting surface 76.

  As described above, in the state where the members related to the support and drive of the first lens L1 are assembled to the housing 20, the pivot convex portion 44 and the pivot concave portion 65 are fitted to the sensor holder 31 coupled to the housing 20. The first lens frame 30 is supported through the portion (FIG. 4). As described above, the pivot recess 65 is a bowl-shaped recess that opens on the front surface side of the base plate portion 60 of the sensor holder 31 and has a conical inner surface that gradually decreases in diameter as the depth increases. Is a concave spherical surface. This concave spherical surface is a part of a spherical surface centered on the swing center A1 (FIG. 4). The pivot convex portion 44 is a convex portion having a conical outer surface that gradually decreases in diameter as it advances toward the distal end side, and the distal end portion is a convex spherical surface. This convex spherical surface is a part of a spherical surface centered on the swing center A1. The urging arm 36 urged by the coil spring 37 applies a force to press the tip of the pivot convex portion 44 against the bottom portion of the pivot concave portion 65 and receives the guidance of the contact portion between the pivot convex portion 44 and the pivot concave portion 65. Thus, the first lens frame 30 is supported so as to be capable of swinging around the swing center A1 (by tilting the pivot convex portion 44 with respect to the pivot concave portion 65). Since the tip of the pivot convex portion 44 is a part of a spherical surface centered on the swing center A1, the pivoting of the spherical center does not change the position of the swing center A1 and the pivot convex portion 44 and the pivot. This is performed while changing the contact position of the recess 65. As can be seen from FIG. 4, the conical inner surface portion of the pivot concave portion 65 is formed in a conical shape having a larger central angle than the conical outer surface portion of the pivot convex portion 44. It can be executed without disturbing the movement. Further, a contact portion between the pivot convex portion 44 and the pivot concave portion 65 is a part of a spherical surface (the aforementioned convex spherical surface and concave spherical surface) centered on the swing center A1, and the curved surface 41c of the pivot arm 41b is swung. By using a part of the spherical surface with the center A1 as the center, the pressing step portion 36c of the urging arm 36 is not displaced in the front-rear direction when the first lens frame 30 swings in the spherical center, and the spring load of the coil spring 37 is reduced. Does not change (a constant load is applied in the front-rear direction and no extra load is generated in directions other than the front-rear direction). Thereby, it is possible to realize stable vibration control with high accuracy without adversely affecting the drive control of the first lens frame 30 by the electromagnetic actuator.

  The guide portion 45 and the rotation restricting protrusion 66 are rotation restricting means for restricting the rotation of the first lens frame 30 around the optical axis of the first lens L1 while allowing the ball center of the first lens frame 30 to swing. . Here, the optical axis of the first lens L1 refers to the optical axis at the initial position of vibration isolation (that is, the first optical axis O1 shown in the figure) and the optical axis in a state where the ball center swings from the initial position of vibration isolation. Any of these are included. The rotation restricting protrusion 66 has an axis line (longitudinal direction) directed in a radial direction centered on an imaginary line extending from the first optical axis O <b> 1, and is sandwiched between a pair of opposed surfaces 45 a of the guide portion 45. The rotation restricting protrusion 66 has a cylindrical outer peripheral surface sandwiched between a pair of opposed surfaces of the guide portion 45. The rotation of the first lens frame 30 around the optical axis of the first lens L1 is restricted by the guide portion 45 sandwiching the rotation restricting protrusion 66. Since the optical axis of the first lens L1 coincides with the first optical axis O1 in the drawing when the first lens frame 30 is at the initial position for image stabilization, the guide portion 45 and the rotation restricting projection 66 are arranged with the first optical axis O1. The rotation of the first lens frame 30 around the center is restricted. On the other hand, when the first lens frame 30 is tilted from the image stabilization initial position due to the ball center swing, the rotation of the first lens frame 30 about the optical axis of the tilted first lens L1 45 and the rotation restricting projection 66. Therefore, the first lens frame 30 and the cover member 32 include a position limiting protrusion 46L and a position limiting surface 76L, a position limiting protrusion 46R and a position limiting surface 76R, a position limiting protrusion 46U and a position limiting surface 76U, and a position limiting protrusion 46D and a position limiting protrusion 46D. The surfaces 76D are always kept facing each other.

  The driving means for pivoting the first lens frame 30 supported as described above is an electromagnetic actuator composed of two voice coil motors composed of a permanent magnet 81 and a coil 83, and a permanent magnet 82 and a coil 84. The rotation of the first lens L1 about the optical axis of the first lens frame 30 is restricted by the guide portion 45 and the rotation restricting projection 66 while allowing the first lens frame 30 to swing around the center of rotation A1. Thus, the first lens frame 30 can be pivoted with high accuracy and stability by two voice coil motors having different directions of thrust action.

  The details of the driving means for swinging the first lens frame 30 in the spherical center will be described. Each of the permanent magnet 81 and the permanent magnet 82 has a flat shape having a planar extension along the tangential planes 81t and 82t (virtually shown in FIG. 13) of a common virtual spherical surface centered on the swing center A1. Have. Each of the coils 83 and 84 is a flat coil formed by winding a conducting wire in a direction parallel to a common virtual spherical tangent plane 83t, 84t (shown virtually in FIG. 13) centering on the oscillation center A1. It is. The tangential plane 81t and the tangential plane 83t are in a substantially parallel relationship, and the tangential plane 82t and the tangential plane 84t are in a substantially parallel relationship. The coils 83 and 84, the hall sensor 85 and the hall sensor 86 are always arranged substantially symmetrically with respect to the reference plane P1 regardless of the pivot of the first lens frame 30. The permanent magnet 81 and the permanent magnet 82 are arranged substantially symmetrically with respect to the reference plane P1 when the first lens frame 30 is in the initial position for image stabilization. That is, it is an imaginary sphere centered on the swing center A1, and the position of the intersection of the first optical axis O1 and its extension line is a double pole point. A circular arc on a sphere connecting the two pole points is a meridian and orthogonal to the meridian. When the arc on the related spherical surface is regarded as a latitude line, the outer shape center of the permanent magnet 81 and the outer shape center of the permanent magnet 82 are located on the same latitude line of the virtual spherical surface (on the same circle centered on the first optical axis O1). To do. The outer center of the coil 83 and the outer center of the coil 84 are also on the same latitude line (the first optical axis O1) of the same virtual spherical surface (the virtual spherical surface having a larger diameter than the virtual spherical surface where the outer peripheral centers of the permanent magnets 81 and 82 are located). Located on the same circle centered on). In the radial direction of the virtual sphere centered on the swing center A1, the Hall sensor 85, the permanent magnet 81, and the coil 83 are arranged in order from the inner diameter side close to the swing center A1. The coil 83 and the hall sensor 85 are positioned (see FIGS. 12, 13, and 15 to 17). Further, the hall sensor 86, the permanent magnet 82, and the coil 84 are arranged in order from the inner diameter side near the swing center A1, and the coil 84 and the hall sensor 86 are located in the magnetic field of the permanent magnet 82 (FIGS. 12 and 13). FIG. 15 and FIG. 16).

  When the coil 83 located in the magnetic field of the permanent magnet 81 is energized, the permanent magnet 81 is moved along the spherical tangent planes 81t and 83t (FIG. 13) centering on the swing center A1 according to Fleming's left-hand rule. Thrust is generated in a direction perpendicular to the magnetic pole boundary Q1 and the pair of long sides 83a of each coil 83. Similarly, when the coil 84 located in the magnetic field of the permanent magnet 82 is energized, the magnetic pole boundary line Q2 of each permanent magnet 82 along the spherical tangent planes 82t and 84t (FIG. 13) centering on the oscillation center A1. And a thrust in a direction perpendicular to the pair of long side portions 84a of each coil 84 is generated. The acting directions of these thrusts are shown as arrows E1 and E2 in FIGS. The coils 83 and 84 are fixedly supported with respect to the housing 20 via the cover member 32, and the permanent magnets 81 and 82 are supported by the movable first lens frame 30. The thrusts E1 and E2 generated by energization act as a force for moving the first lens frame 30 along a virtual spherical surface centered on the swing center A1. Since the set of the permanent magnet 81 and the coil 83 and the set of the permanent magnet 82 and the coil 84 are arranged at different circumferential positions around the first optical axis O1, the two sets of voice coil motors The first lens frame 30 can be pivoted in any direction by a combination of energization control. As described above, the rotation operation of the first lens frame 30 around the optical axis of the first lens L1 is restricted by the fitting of the guide portion 45 and the rotation restricting projection 66 when the ball is pivoted. The four position limiting protrusions 46 (46L, 46R, 46U, 46D) provided on the first lens frame 30 and the four position limiting surfaces 76 (76L, 76R, 76U, 76D) formed on the cover member 32 are It functions as a stopper that determines the mechanical movement end of the swing of the center of the lens frame 30. Thereby, the deviating operation of the first lens frame 30 such that the permanent magnet 81 and the coil 83 and the permanent magnet 82 and the coil 84 are not opposed to each other is prevented, and the position of the first lens frame 30 can always be controlled reliably. it can.

  When the permanent magnet 81 moves in accordance with the swing of the spherical center of the first lens frame 30 and the magnetic field changes, the output of the Hall sensor 85 positioned facing the permanent magnet 81 changes, and the permanent magnet 82 moves. When the magnetic field changes, the output of the hall sensor 86 located opposite to the permanent magnet 82 changes. The drive position of the first lens frame 30 can be detected by the output changes of the two hall sensors 85 and 86.

  When the imaging unit 10 configured as described above is directed to a subject positioned in front, reflected light (photographing light) of the subject passes through the first lens L1 and then enters the inside of the first prism L11 from the incident surface L11-a. The traveling direction of the first prism L11 is converted into a substantially vertical direction toward the exit surface L11-b by the reflecting surface L11-c. The reflected light that has exited the exit surface L11-b of the first prism L11 passes through the second lens L2, the second group G2, the third group G3, and the fourth group G4, and then enters the second prism from the entrance surface L12-a. The traveling direction is converted into a substantially vertical direction toward the exit surface L12-b by the reflecting surface L12-c of the second prism L12 and is captured (received) by the imaging surface of the imaging sensor 14. By using the lens driving motor M to move the second group G2 and the third group G3 back and forth along the second optical axis O2, it is possible to cause the imaging optical system to perform a zooming operation and a focusing operation. .

  Further, the imaging unit 10 performs an image stabilization (image blur correction) operation using the first lens L1 located in front of the first prism L11 in the first group G1. As described above, the vibration isolation mechanism 13 causes the first lens frame 30 to pivot about the sensor holder 31 and the cover member 32 that are fixed to the housing 20. As an advantage of selecting the first lens L1 as an optical element for vibration isolation, the imaging unit 10 can be configured to be thin in the front-rear direction while including the vibration isolation mechanism 13. For example, unlike the present embodiment, assuming an anti-vibration mechanism that moves the second group G2 and the third group G3 in a direction orthogonal to the second optical axis O2, the second group frame 20 and the third group frame 21 are used for moving. By securing the space and arranging the driving means for the second group frame 20 and the third group frame 21, the space in the front-rear direction required in the housing 20 becomes wider than in the illustrated embodiment, and the imaging unit 10 Will increase in thickness. In addition, the configuration of the present embodiment has an advantage that the movable portion is compact and the driving load is small because only the first lens L1 is driven in the image stabilization control, not the entire first group G1. In the first lens group G1 of the present embodiment, the general anti-vibration mechanism drives the entire lens group, but the first prism that only reflects the light beam between the first lens L1 and the second lens L2 having power. Since L11 is arranged, the distance between the first lens L1 and the second lens L2 is large, and even when the image stabilization control is performed by moving the first lens L1 alone, there is little deterioration in aberrations. That is, in the imaging optical system, aberrations are managed in the entire first group G1 from the first lens L1 to the second lens L2, but with regard to image stabilization, the interval in the optical axis direction increases with the first prism L11 interposed therebetween. Focusing on the fact that the optical performance can be ensured even if the first lens L1 and the second lens L2 are treated as if they are substantially different lens groups, only the first lens L1 is set as an anti-vibration optical element. doing.

  In particular, in the imaging unit 10, paying attention to the bending optical system in which the first prism L11 is disposed behind the first lens L1, the swing center A1 serving as the fulcrum of the center swing of the first lens frame 30 is detected. The position is set to the rear position of the reflecting surface L11-c of the first prism L11. Thereby, the back side of the first prism L11 is effectively used as an installation space for the support mechanism of the first lens frame 30, and the ball center swing is realized with a configuration excellent in space efficiency. Specifically, a first lens frame such as a pivot convex portion 44 (pivot arm 41b), a pivot concave portion 65 (sensor holder 31), a biasing arm 36, a coil spring 37, a guide portion 45, and a rotation restricting projection 66 (sensor holder 31). The parts related to the support of 30 are gathered and stored in the rear position of the reflecting surface L11-c of the first prism L11. Since the rear position of the reflecting surface L11-c is outside the optical path of the optical system, no adverse optical effect occurs even if the support mechanism for the first lens frame 30 is installed.

  Further, the permanent magnets 81 and 82, the coils 83 and 84, and the hall sensors 85 and 86 related to the anti-vibration driving and control of the first lens L1 are deflected by the first prism L11 in the left and right regions sandwiching the reference plane P2. The light flux is arranged in a region on the left side opposite to the traveling direction of the luminous flux (the traveling direction of the second optical axis O2). In this region, since the optical element (after the second lens L2) from the first prism L11 among the optical elements constituting the imaging optical system is not arranged, it is not easily limited by space, and the permanent magnet 81, 82, coils 83 and 84, and hall sensors 85 and 86 are suitable.

  In addition, on the optical path ahead of the first prism L11 (a region on the right side of the reference plane P2), a motor M for driving the second group G2 and the third group G3 along the second optical axis O2, etc. In the case where such metal parts are made of a magnetic metal, if the metal parts are close to the electromagnetic actuator, the vibration-proof drive may be affected. Even when the support driving mechanism of the second group G2 or the third group G3 includes a magnetic metal by arranging the permanent magnets 81 and 82 and the coils 83 and 84 in the region on the left side of the reference plane P2, the electromagnetic actuator There is an effect that it is difficult to affect the driving of the motor.

  In the imaging unit 10 described above, the sensor is a plane that passes through the center 85a (FIGS. 12, 13, and 15 to 17) of the Hall sensor 85 and the first optical axis O1 and parallel to the first optical axis O1. The sensor defining surface which is a plane that passes through the defining surface K1, the center 86a (FIGS. 12, 13, 15, and 16) of the sensor sensing portion of the Hall sensor 86 and the first optical axis O1 and parallel to the first optical axis O1. K2 is shown in FIG. 11, FIG. 12, FIG. 14 and FIG. Note that the centers 85a and 86a of the sensor sensing units mean the centers of effective areas in which the Hall sensors 85 and 86 sense a magnetic field. The sensor defining surface K1 and the sensor defining surface K2 have a crossing angle Z1 across the reference plane P1 of about 120 °, a crossing angle Z2 across the reference plane P2 of about 60 °, and an inclination angle with respect to the reference plane P1. The inclination angle with respect to the reference plane P2 is approximately 30 ° forward and backward, and approximately 30 ° with respect to the reference plane P2. That is, the reference plane P1 is located at the intersection center on the obtuse angle side of the sensor defining plane K1 and the sensor defining plane K2 that intersect non-orthogonally (intersection angle Z1), and the intersection angle is small (intersection angle Z2). The reference plane P2 is located at the intersection center on the acute angle side.

  In the circumferential direction centered on the first optical axis O1, the permanent magnet 81 and the permanent magnet 82, and the coil 83 and the coil 84 are circumferential intervals corresponding to the intersection angles Z1 and Z2 of the sensor defining surface K1 and the sensor defining surface K2, respectively. That is, they are arranged at an inclination of about 60 ° in the forward and reverse directions with respect to the reference plane P1. When viewed along the first optical axis O1 as shown in FIG. 11, the magnetic pole boundary Q1 of the permanent magnet 81 and the long side portion 83a of the coil 83 are arranged so as to intersect substantially perpendicular to the sensor defining surface K1. . Further, the magnetic pole boundary Q2 of the permanent magnet 82 and the long side portion 84a of the coil 84 are arranged so as to intersect with the sensor defining surface K2 substantially perpendicularly. Then, the thrust E1 (FIGS. 7 and 8) by the permanent magnet 81 and the coil 83 acts along the sensor defining surface K1, and the thrust E2 (FIGS. 7 and 8) by the permanent magnet 82 and the coil 84 is the sensor defining surface K2. Acts along. Note that the center of the outer shape of the permanent magnet 81 and the coil 83 is offset in the direction along the magnetic pole boundary line Q1 and the long side portion 83a with respect to the sensor defining surface K1. Similarly, the outer center of the permanent magnet 82 and the coil 84 is offset in the direction along the magnetic pole boundary line Q2 and the long side portion 84a with respect to the sensor defining surface K2 (FIGS. 11, 12, 14, and FIG. 15). When a plane passing through the outer center of the permanent magnet 81 and the coil 83 and parallel to the sensor defining surface K1 and a plane passing through the outer center of the permanent magnet 82 and the coil 84 and parallel to the sensor defining surface K2 are set, these two planes are: It intersects on the reference plane P1 on the right side of the first optical axis O1 (the traveling direction of the second optical axis O2).

  As shown in FIG. 15, on the reference plane P1, a position limiting protrusion 46L and a position limiting surface 76L that define a moving end (swinging end) to the left of the first lens frame 30 that swings the ball center, A position limiting protrusion 46R and a position limiting surface 76R that define a rightward moving end (oscillation end) are provided. Further, on the reference plane P2, a position limiting protrusion 46U and a position limiting surface 76U that define an upward movement end (swinging end) of the first lens frame 30 and a downward movement end (swinging end) are defined. A position limiting protrusion 46D and a position limiting surface 76D are provided. FIG. 20 shows output changes of the Hall sensors 85 and 86 when the first lens frame 30 is pivoted until the movement restriction by these restriction means is received. F1 in FIG. 20 is a sensor output when the first lens frame 30 is pivoted along the reference plane P1 (intersecting center on the obtuse angle side of the sensor defining surfaces K1 and K2), and F2 is the reference plane. This is a sensor output when the first lens frame 30 is pivoted along the center P2 (the intersection center on the acute angle side of the sensor defining surfaces K1 and K2).

  When the imaging unit 10 is activated, the control unit 89 initializes the image stabilization mechanism 13 (calibration of the hall sensors 85 and 86). In the initialization, the first lens frame 30 is driven to a predetermined moving end that is mechanically limited, and the positions of the permanent magnets 81 and 82 with respect to the hall sensors 85 and 86 are changed in the maximum range. , 86 is converted into position information. In the imaging unit 10 of the present embodiment, at the time of initialization, the moving end in the vertical direction restricted by the position restricting protrusion 46U and the position restricting surface 76U, the position restricting protrusion 46D and the position restricting surface 76D (the swinging end for swinging the ball core). ) To drive the first lens frame 30. That is, the initialization is performed with reference to the moving end of the first lens frame 30 along the reference plane (center plane) P2, which is the intersection center on the acute angle side of the sensor defining surfaces K1 and K2. As shown in FIG. 20, the moving end along the reference plane P1 that is the center of intersection of the sensor defining surfaces K1 and K2 on the obtuse angle side (the position where the position limiting protrusion 46L and the position limiting surface 76L abut, the position limiting protrusion 46R and the position When the first lens frame 30 is driven to the position where the limiting surface 76R comes into contact (F1), the moving end (position limiting protrusion 46U) along the reference plane P2 that is the intersection center on the acute angle side of the sensor defining surfaces K1, K2. When the first lens frame 30 is driven to the position where the position limiting surface 76U abuts and the position where the position limiting projection 46D contacts the position limiting surface 76D (F2), the outputs of the hall sensors 85, 86 are output. The change is great. Therefore, only by driving the first lens frame 30 along the latter reference plane P2, a state in which the two permanent magnets 81 and 82 are moved in full scale with respect to the two Hall sensors 85 and 86 is obtained, and the reference plane P1 is obtained. The initialization can be completed without driving the first lens frame 30 along. As a result, it is possible to obtain effects such as an improvement in response until preparation of the image stabilization mechanism is completed and photographing becomes possible, and a reduction in control burden.

  21 to 23 show a second embodiment. The anti-vibration mechanism 113 of this embodiment is applied to the optical system (FIG. 3) common to the imaging unit 10 described above, and the first lens frame (movable member) 130 includes a first lens holding portion 140. One lens L1 is held. The first lens frame 130 is connected to a pair of rear extension portions 141a that are spaced apart in the vertical direction and extend rearward from the lens holding frame 140, and a rear end of the pair of rear extension portions 141a. It has a support part 141 constituted by a bridge part 141b extending in the vertical direction and a pivot arm 141c extending from the bridge part 141b toward the reference plane P2. A pivot convex portion 144 that protrudes rearward is formed at the tip of the pivot arm 141c. The pivot convex portion 144 is centered on a swing center A1 (FIG. 23) with respect to a pivot concave portion that is not shown. It is supported so as to be swingable. A curved surface 141d facing forward opposite to the pivot convex portion 144 is formed at the tip of the pivot arm 141c, and the pivot convex portion 144 is brought into contact with the pivot concave portion by an urging means (not shown) that presses the curved surface 141d. State is maintained.

  Further, the first lens frame 130 further has a vertical width corresponding to the pair of rearward extending portions 141a (arranged between the pair of rearward extending portions 141a in the circumferential direction around the first optical axis O1). Thus, the magnet holding part 142 and the magnet holding part 143 are formed, and the permanent magnet 181 is held by the magnet holding part 142 and the permanent magnet 182 is held by the magnet holding part 143 as shown in FIG. In the radial direction of the virtual sphere centered on the swing center A1, in order from the inner diameter side close to the swing center A1, a hall sensor (detection member, magnetic sensor) 185, permanent magnet (actuator, voice coil motor) 181, coil (Actuator, voice coil motor) 183 are arranged side by side, Hall sensor (detection member, magnetic sensor) 186, permanent magnet (actuator, voice coil motor) 182 and coil (actuator, voice coil motor) 184 are arranged side by side. The The coils 183 and 184 and the hall sensors 185 and 186 are respectively supported by fixed support members such as the cover member 32 and the sensor holder 31 of the first embodiment.

  The center 185a (FIG. 22) of the sensor sensing part of the hall sensor 185, the sensor defining surface K11 that is a plane passing through the first optical axis O1 and parallel to the first optical axis O1, and the center 186a of the sensor sensing part of the hall sensor 186 ( 22) and the first optical axis O1, and the sensor defining surface K12 which is a plane parallel to the first optical axis O1 has an intersection angle Z11 across the reference plane P1 of about 60 ° and an intersection across the reference plane P2. The angle Z12 is about 120 °, the inclination angle with respect to the reference plane P1 is about 30 ° in the forward and reverse directions, and the inclination angle with respect to the reference plane P2 is about 60 ° in the forward and reverse directions. That is, contrary to the first embodiment, the reference plane P2 is located at the intersection center on the obtuse angle side of the sensor defining surface K11 and the sensor defining surface K12 that intersect non-orthogonally with a large intersection angle (intersection angle Z12). The reference plane P1 is located at the intersection center on the acute angle side where the intersection angle is small (intersection angle Z11).

  As shown in FIG. 21, the coil 183 has a pair of long sides 183a and a pair of short sides 183b, and a pair of long sides with respect to the magnetic pole boundary Q11 that separates the N pole and the S pole of the permanent magnet 181. 183a is substantially parallel. Similarly, the coil 184 has a pair of long sides 184a and a pair of short sides 184b, and the pair of long sides 184a is substantially parallel to the magnetic pole boundary Q12 that separates the N pole and the S pole of the permanent magnet 182. is there. When the coils 183 and 184 are energized, thrust is generated in a direction perpendicular to the magnetic pole boundary lines Q11 and Q12 and the long sides 183a and 184a. In the circumferential direction centered on the first optical axis O1, the permanent magnet 181 and the permanent magnet 182 and the coil 183 and the coil 184 are spaced apart from each other in the circumferential direction corresponding to the intersection angles Z11 and Z12 of the sensor defining surface K11 and the sensor defining surface K12. (The inclination is about 30 ° in the forward and reverse directions with respect to the reference plane P1). More specifically, the outer center of each of the permanent magnet 181 and the coil 183 is generally located on the sensor defining surface K11, and the outer center of the permanent magnet 182 and the coil 184 is generally located on the sensor defining surface K12. Then, if two planes passing through the center of each of the permanent magnets 181 and 182 (or coils 183 and 184) and the first optical axis O1 and parallel to the first optical axis O1 are set, these two planes are the reference plane. The intersection angle across P1 is about 60 °, and the intersection angle across reference plane P2 is about 120 °. The thrust by the permanent magnet 181 and the coil 183 acts along the sensor defining surface K11, and the thrust by the permanent magnet 182 and the coil 184 acts along the sensor defining surface K12.

  Four position restricting projections (movement restricting portions, projecting portions) 146 are provided on the outer peripheral portion of the first lens frame 130 at substantially equal intervals (90 ° intervals) in the circumferential direction around the first optical axis O1. The fixed support member (a member not shown corresponding to the cover member 32 of the first embodiment) that supports the first lens frame 130 has four position restriction surfaces (movement restriction) facing the four position restriction protrusions 146. Part, contact surface) 176 is formed. The position limiting protrusion 146L and the position limiting surface 176L, and the position limiting protrusion 146R and the position limiting surface 176R arranged on the reference plane P1 are the movement ends (swings) of the first lens frame 130 that swings in the center direction. Determine the moving end). The position limiting protrusion 146U and the position limiting surface 176U, and the position limiting protrusion 146D and the position limiting surface 176D arranged on the reference plane P2 are moving ends (swings) in the vertical direction of the first lens frame 130 that swings the ball. Determine the moving end).

  In the second embodiment, the control unit of the imaging unit performs the position limiting projection 146L, the position limiting surface 176L, the position limiting projection 146R, and the position limiting surface when the image stabilization mechanism 113 is initialized (calibration of the hall sensors 185 and 186). The first lens frame 130 is driven to the moving end in the left-right direction (the swinging end of the pivoting movement of the ball center) limited by 176R. That is, initialization is performed with reference to only the moving end of the first lens frame 130 along the reference plane (center plane) P1, which is the intersection center of the sensor defining surfaces K11 and K12 on the acute angle side. Thereby, the effect similar to 1st Embodiment can be acquired.

  The first and second embodiments described above are applied to the anti-vibration mechanisms 13 and 113 that cause the first lens L1 to swing about the ball. It can also be applied to. FIGS. 24 to 33 illustrate an example of a vibration isolating mechanism 213 that moves the first lens L1 along a plane perpendicular to the first optical axis O1, as an example of an anti-vibration mechanism that performs an operation other than the swinging of the spherical center. Is shown. A vibration isolating mechanism 313 according to a third embodiment in which the present invention is applied to this planar motion type vibration isolating mechanism is shown in FIGS. 34 to 36, and a vibration isolating mechanism 413 according to the fourth embodiment is shown in FIGS. Show.

  A first lens (anti-vibration optical element) L21 constituting the anti-vibration mechanism 213 shown in FIGS. 24 to 33 is an anti-vibration optical element corresponding to the first lens L1 of the first and second embodiments. The first prism (reflective optical element) L211 is a reflective optical element substantially common to the first prism L11 in the first embodiment, and a light beam incident along the first optical axis O1 is incident on the second optical axis O2. A reflecting surface (not shown in the figure) that reflects in the direction along the incident surface, an incident surface L211-a (FIGS. 30 and 33) positioned on the first optical axis O1, and an output positioned on the second optical axis O2. It has a surface L211-b (FIGS. 26, 30, and 33). Although optical elements other than the first lens L21 and the first prism L211 are not shown in FIGS. 24 to 33, the optical elements from the second lens L2 to the image sensor 14 shown in FIG. Shall be distributed. The first optical axis O1, the second optical axis O2, the reference plane P1, and the reference plane P2 in the image stabilization mechanism 213 are defined in the same manner as the image stabilization mechanisms 13 and 113 in the first and second embodiments. And

  The base frame (support member) 250 is a fixed support member corresponding to the first support portion 23 of the housing 20 of the imaging unit 10 of the first embodiment, and includes a prism holding frame 251 that holds the first prism L211. . On the left side of the prism holding frame 251, flange-shaped sensor support portions 252 and 253 that are substantially perpendicular to the first optical axis O1 are formed. Hall sensors 285 and 286 are supported on the front side of the sensor support portions 252 and 253.

  Around the prism holding frame 251, two movement restricting projections (movement restricting portions) 254 projecting forward, three ball support holes 255 that are bottomed recesses opened forward, and projecting laterally Three spring-hanging projections 256 are formed. More specifically, the two movement restriction protrusions 254 are arranged on the right side of the reference plane P2 in a substantially symmetrical positional relationship with the reference plane P1 interposed therebetween. One ball support hole 255 is formed on the left side of the prism holding frame 251 on the reference plane P1, and two balls are positioned on the right side of the reference plane P2 with a substantially symmetrical positional relationship across the reference plane P1. A support hole 255 is formed. One spring hooking protrusion 256 is formed on the left side of the prism holding frame 251 so as to be positioned on the reference plane P1, and two spring hooking protrusions 256 are positioned above and below the prism holding frame 251 on the reference plane P2. Is formed.

  The first lens frame 230 has an outer peripheral protruding portion 232 around the frame-shaped lens holding portion 231 that holds the first lens L21, and three ball contact surfaces 233 (FIG. 32) on the rear surface of the outer peripheral protruding portion 232. Is formed. The three ball contact surfaces 233 are provided at positions facing the three ball support holes 255 of the base frame 250, and the guide balls 240 are interposed between the ball contact surfaces 233 and the bottom surfaces of the ball support holes 255. Is pinched. The bottom surfaces of the ball contact surface 233 and the ball support hole 255 are smooth flat surfaces that are substantially perpendicular to the first optical axis O1. The guide ball 240 is loosely fitted to the ball support hole 255 in a direction perpendicular to the first optical axis O1, and when the guide ball 240 is located near the center in the ball support hole 255, the guide ball 240 is inside the ball support hole 255. Does not touch the wall.

  Three spring hooking protrusions 234 are provided on the outer peripheral portion of the first lens frame 230 at different positions in the circumferential direction, and between the three spring hooking protrusions 234 and three spring hooking protrusions 256 provided on the base frame 250. Three tension springs 241 are stretched. The first lens frame 230 is urged in a direction (rearward) toward the base frame 250 by the urging forces of the three tension springs 241, and the first lens frame 230 is brought into contact with the guide ball 240 by bringing the ball contact surface 233 into contact therewith. The rearward movement is restricted. In this state, the three ball contact surfaces 233 are in point contact with the three guide balls 240, respectively. By sliding the point contact portions in contact (or the guide balls 240 are inside the ball support holes 255). The first lens frame 230 is freely movable along a plane perpendicular to the first optical axis O1 while rolling the guide ball 240 when not in contact with the wall.

  Two movement restriction holes (movement restriction parts) 235 for inserting two movement restriction protrusions 254 provided on the base frame 250 are further formed on the outer peripheral protrusion 232 of the first lens frame 230. As shown in FIG. 33, each movement limiting hole 235 has a rectangular inner surface shape that is substantially square in a plane orthogonal to the first optical axis O1, and one diagonal direction of the movement limiting hole 235 is the left-right direction. The other diagonal direction coincides with the vertical direction. The first lens frame 230 can move with respect to the base frame 250 within a range until the movement restriction protrusion 254 contacts the inner surface of the movement restriction hole 235.

  The first lens frame 230 has magnet holding portions 236 and 237 that are substantially symmetrical with respect to the reference plane P1 on the left side of the lens holding portion 231, holds the permanent magnet 281 on the magnet holding portion 236, and holds the magnet. A permanent magnet 282 is held on the portion 237. The permanent magnets 281 and 282 are flat rectangular parallelepipeds extending along a plane substantially perpendicular to the first optical axis O1, and have N poles on one side across the magnetic pole boundary lines Q21 and Q22 shown in FIG. However, it has an S pole on the other side. The shapes and sizes of the permanent magnets 281 and 282 are substantially the same, and are symmetrical with respect to the reference plane P1 with the magnetic pole boundary lines Q21 and Q22 directed toward the reference plane P1 as they move away from the reference plane P2. Arranged in relationship.

  Coils 283 and 284 are provided facing the front of the permanent magnets 281 and 282. The coils 283 and 284 are supported by a fixed support member (not shown) such as the cover member 32 of the first embodiment. Each of the coils 283 and 284 is a flat air-core coil that spreads along a plane substantially perpendicular to the first optical axis O1, and includes a pair of long sides 283a and 284a that are substantially parallel to the pair of long sides 283a. 284a and a pair of curved portions 283b and 284b. In the coils 283 and 284, the pair of long sides 283a are substantially parallel to the magnetic pole boundary line Q21 of the permanent magnet 281 and the pair of long sides 284a are set to the magnetic pole boundary of the permanent magnet 282 with the air core portion facing in the front-rear direction. Arranged substantially parallel to the line Q22. The coils 283 and 284 have substantially the same shape and size, and are arranged in a symmetrical relationship with respect to the reference plane P1.

  The first lens frame 230 is driven by an electromagnetic actuator (two voice coil motors) composed of a permanent magnet 281 and a coil 283 and a permanent magnet 282 and a coil 284. When the coil 283 is energized, a thrust E21 (FIG. 28) perpendicular to the magnetic pole boundary Q21 and the long side portion 283a is generated in a plane perpendicular to the first optical axis O1, and when the coil 284 is energized, A thrust E22 (FIG. 28) is generated in a direction perpendicular to the magnetic pole boundary Q22 and the long side portion 284a in a plane perpendicular to the optical axis O1, and the first lens frame 230 is supported by the three guide balls 240. However, it moves along a plane perpendicular to the reference plane P1. Image blur correction is performed by the movement of the first lens frame 230.

  In a state where the first lens frame 230 is supported on the base frame 250, the Hall sensors 285 and 286 supported by the sensor support portions 252 and 253 of the base frame 250 are connected to the magnet holding portions 236 and 237 of the first lens frame 230. The position of the first lens frame 230 (first lens L21) is detected by the outputs of the hall sensors 285 and 286.

  The anti-vibration mechanism 213 shown in FIGS. 24 to 33 has a sensor defining surface K21 that is a plane passing through the center 285a (FIG. 32) of the sensor sensing portion of the Hall sensor 285 and the first optical axis O1 and parallel to the first optical axis O1. (FIG. 28, FIG. 32), the center 286a (FIG. 32) of the sensor sensing portion of the Hall sensor 286, and the sensor defining plane K22 (FIG. 28, FIG. 28) which is a plane passing through the first optical axis O1 and parallel to the first optical axis O1. FIG. 32) shows a relationship of 90 ° crossing angle (the crossing angle Z21 across the reference plane P1 and the crossing angle Z22 across the reference plane P2 are both 90 °). In this configuration, the first lens frame 230 is moved in two movement directions along the reference plane P1 and the reference plane P2 when the first lens frame 230 is moved in two movement directions along the sensor definition plane K21 and the sensor definition plane K22. When 230 is moved, the output of each Hall sensor 285, 286 changes equally. Therefore, the movement along both the sensor defining surface K21 and the sensor defining surface K22 or the movement along both the reference plane P1 and the reference plane P2 is performed until the movement limiting projection 254 contacts the inner surface of the movement limiting hole 235. The image stabilization mechanism 213 is initialized (calibration of the hall sensors 285 and 286) by causing the first lens frame 230 to perform.

  The anti-vibration mechanism 313 of the third embodiment will be described with reference to FIGS. This anti-vibration mechanism 313 is based on the anti-vibration mechanism 213 described with reference to FIGS. 24 to 33, and permanent magnets (actuators, voice coil motors) 381, 382 and coils (actuators, voice coil motors) 383, 384. And Hall sensors (detection members, magnetic sensors) 385 and 386 are arranged differently. In FIG. 34 to FIG. 36, parts common to the previous vibration isolation mechanism 213 are denoted by the same reference numerals.

  In the anti-vibration mechanism 313, the sensor defining surface K31 (FIGS. 34 and 35) which is a plane passing through the center 385a (FIG. 35) of the sensor sensing portion of the Hall sensor 385 and the first optical axis O1 and parallel to the first optical axis O1. The sensor defining surface K32 (FIGS. 34 and 35), which is a plane passing through the center 386a (FIG. 35) and the first optical axis O1 of the Hall sensor 386 and parallel to the first optical axis O1, is a reference plane. The crossing angle Z31 across P1 is about 120 °, the crossing angle Z32 across the reference plane P2 is about 60 °, and the inclination angle with respect to the reference plane P1 is about 60 ° in the opposite direction, with respect to the reference plane P2. The inclination angle of each other is approximately 30 ° in the forward and reverse directions. That is, the Hall sensors 385 and 386 and the sensor defining surfaces K31 and K32 are arranged in the circumferential direction around the first optical axis O1, respectively. It is the same as K2.

  The permanent magnets 381 and 382 held by the magnet holders 336 and 337 of the first lens frame (movable member) 330 have their outer centers located on the sensor defining surfaces K31 and K32, and magnetic pole boundaries Q31 and Q32 ( 34) is arranged so as to be substantially perpendicular to the sensor defining surfaces K31 and K32. In the coil 338 having a pair of long sides 383a and a pair of short sides 383b, each long side 383a is disposed substantially parallel to the magnetic pole boundary line Q31 of the permanent magnet 381. In the coil 384 having a pair of long side portions 384a and a pair of short side portions 384b, each long side portion 384a is disposed substantially parallel to the magnetic pole boundary line Q32 of the permanent magnet 382. The permanent magnet 381 and the permanent magnet 382, and the coil 383 and the coil 384 are respectively spaced in the circumferential direction corresponding to the intersection angles Z31 and Z32 of the sensor defining surface K31 and the sensor defining surface K32, that is, in the circumferential direction around the first optical axis O1. Thus, they are arranged with an inclination of about 60 ° in the forward and reverse directions with respect to the reference plane P1. More specifically, when two planes passing through the center of each of the permanent magnets 381 and 382 (or the coils 383 and 384) and the first optical axis O1 and parallel to the first optical axis O1 are set, the two planes are The intersection angle across the reference plane P1 is about 120 °, and the intersection angle across the reference plane P2 is about 60 °. When the coil 383 is energized, a thrust E31 (FIG. 34) is generated in a direction perpendicular to the magnetic pole boundary Q31 and the long side portion 383a in a plane perpendicular to the first optical axis O1, and when the coil 384 is energized, A thrust E32 (FIG. 34) is generated in a direction perpendicular to the magnetic pole boundary Q32 and the long side portion 384a in a plane perpendicular to the optical axis O1.

  In the third embodiment, similar to the vibration isolating mechanism 13 of the first embodiment, when the vibration isolating mechanism 313 is initialized (calibration of the Hall sensors 385 and 386), the intersection center on the acute angle side of the sensor defining surfaces K31 and K32 The first lens frame 330 is moved to the moving end along the reference plane (center plane) P2. Specifically, the movement restricting projections on the upper and lower two corners (strictly speaking, each pair of inclined surfaces sandwiching each corner) of the rectangular inner surface movement restricting holes 235 having four corners on the left and right and top and bottom. The first lens frame 330 is moved until 254 contacts.

  Subsequently, a vibration isolating mechanism 413 according to the fourth embodiment will be described with reference to FIGS. 37 to 39. Similarly to the vibration isolation mechanism 313 of the third embodiment, the vibration isolation mechanism 413 of the fourth embodiment is also based on the vibration isolation mechanism 213 described with reference to FIGS. The arrangement of coil motors 481 and 482, coils (actuators, voice coil motors) 483 and 484, and hall sensors (detection members, magnetic sensors) 485 and 486 are different. In the vibration isolation mechanism 413, a sensor defining surface K41 (FIGS. 37 and 38) that is a plane passing through the center 485a (FIG. 38) of the sensor sensing portion of the Hall sensor 485 and the first optical axis O1 and parallel to the first optical axis O1. The sensor defining surface K42 (FIGS. 37 and 38), which is a plane passing through the center 486a (FIG. 38) and the first optical axis O1 of the Hall sensor 486 and parallel to the first optical axis O1, is a reference plane. The crossing angle Z41 across P1 is about 60 °, the crossing angle Z42 across the reference plane P2 is about 120 °, and the inclination angle with respect to the reference plane P1 is about 30 ° forward and backward, with respect to the reference plane P2. The inclination angle of each other is approximately 60 ° in the forward and reverse directions. That is, the Hall sensors 485 and 486 and the sensor defining surfaces K41 and K42 are arranged in the circumferential direction around the first optical axis O1, respectively, and the Hall sensors 185 and 186 of the second embodiment and the sensor defining surfaces K11 and It is the same as K12.

  The permanent magnets 481 and 482 held by the magnet holding portions 436 and 437 of the first lens frame (movable member) 430 have their outer centers located on the sensor defining surfaces K41 and K42, and the magnetic pole boundary lines Q41 and Q42 ( FIG. 37) is arranged so as to be substantially perpendicular to the sensor defining surfaces K41 and K42. In the coil 483 having a pair of long side portions 483a and a pair of short side portions 483b, each long side portion 483a is disposed substantially parallel to the magnetic pole boundary line Q41 of the permanent magnet 481. In the coil 484 having a pair of long sides 484 a and a pair of short sides 484 b, each long side 484 a is disposed substantially parallel to the magnetic pole boundary line Q <b> 42 of the permanent magnet 482. The permanent magnet 481 and the permanent magnet 482, and the coil 483 and the coil 484 are spaced in the circumferential direction corresponding to the intersection angles Z41 and Z42 between the sensor defining surface K41 and the sensor defining surface K42, that is, in the circumferential direction around the first optical axis O1. Thus, they are arranged with an inclination of about 30 ° in the forward and reverse directions with respect to the reference plane P1. More specifically, when two planes passing through the center of each of the permanent magnets 481 and 482 (or the coils 483 and 484) and the first optical axis O1 and parallel to the first optical axis O1 are set, the two planes are The intersection angle across the reference plane P1 is about 60 °, and the intersection angle across the reference plane P2 is about 120 °. When the coil 483 is energized, a thrust E41 (FIG. 37) in a direction perpendicular to the magnetic pole boundary Q41 and the long side portion 483a is generated in a plane perpendicular to the first optical axis O1, and when the coil 484 is energized, A thrust E42 (FIG. 37) is generated in a direction perpendicular to the magnetic pole boundary line Q42 and the long side portion 484a in a plane perpendicular to the one optical axis O1.

  In the fourth embodiment, similar to the vibration isolation mechanism 113 of the second embodiment, when the vibration isolation mechanism 413 is initialized (calibration of the hall sensors 485 and 486), the intersection center on the acute angle side of the sensor defining surfaces K41 and K42. The first lens frame 430 is moved to the moving end along the reference plane (center plane) P1. Specifically, the movement restricting projections on the two left and right corners (strictly speaking, each pair of inclined surfaces sandwiching each corner) of the rectangular inner surface movement restricting holes 235 having four corners on the left and right and top and bottom. The first lens frame 430 is moved until the 254 contacts.

  Since the image stabilization mechanism 313 can complete the initialization only by driving the first lens frame 330 along the reference plane P2, and the image stabilization mechanism 413 only by driving the first lens frame 430 along the reference plane P1, the initialization can be completed. As in the case of the image stabilization mechanisms 13 and 113 in the first and second embodiments, it is possible to obtain effects such as an improvement in response until the image stabilization mechanism is ready and photography is possible, and a reduction in control burden.

  As mentioned above, although this invention was demonstrated based on illustration embodiment, this invention is not limited to illustration embodiment, It can change in the range which does not deviate from the summary of invention. For example, in each of the illustrated embodiments, the first lenses L1 and L21 located closest to the object side are driven for image stabilization, but the present invention does not target only the lens closest to the object side for image stabilization driving. Any optical element in the imaging optical system can be selected as the anti-vibration optical element. The anti-vibration optical element may be other than a lens, and in the case of a lens, it may be other than a single lens.

  Further, each of the illustrated embodiments is applied to a bending optical system in which the first prisms L11 and L211 are arranged behind the first lenses L1 and L21 that perform anti-vibration driving, but an optical system that is not a bending optical system is used. The present invention can also be applied to an imaging apparatus provided. When applied to a bending optical system, a mirror or the like may be used as a reflecting element instead of the prism, and the present invention can also be applied to an imaging apparatus that does not include the second prism L12 and has an L-shaped optical path. Alternatively, an imaging apparatus of a bending optical system having another reflective element in addition to the first prism L11 and the second prism L12 is also an application target. In any case, the bending angle (reflection angle) of the optical axis by the reflecting element may be a value other than 90 °.

  The present invention can be applied to any anti-vibration mechanism that causes the anti-vibration optical element to move in a direction perpendicular to the optical axis, and does not specify the operation mode of the anti-vibration optical element. For example, in the illustrated embodiment, an anti-vibration mechanism (first and second embodiments) of the type that causes the first lens L1 to swing around the center of the swing center A1 on the extension of the first optical axis O1; The first lens L1 is applied to an anti-vibration mechanism (third and fourth embodiments) that horizontally moves the first lens L1 along a plane perpendicular to the first optical axis O1. The present invention can also be applied to an anti-vibration mechanism that is performed by an optical element.

  Also for the specific structure for driving the vibration-proof optical element, a form different from the illustrated embodiment can be adopted. For example, an anti-vibration mechanism of the type in which the anti-vibration optical element swings in the center corresponds to the pivot convex portions 44 and 144, contrary to the support structure of the first lens frames 30 and 130 in the anti-vibration mechanisms 13 and 113. It is also possible to provide a convex portion in the sensor holder 31 and provide a concave portion corresponding to the pivot concave portion 65 in the first lens frames 30 and 130. In addition, the first lens frames 30 and 130 may be configured such that the convex portions corresponding to the pivot convex portions 44 and 144 abut against a plane perpendicular to the first optical axis O1 instead of a concave portion such as the pivot concave portion 65. The ball center can be swung. Also in this case, it is possible to arbitrarily select which of the first lens frames 30 and 130 and the sensor holder 31 is provided with the convex portion and the flat surface.

  In the type of anti-vibration mechanism that horizontally moves the anti-vibration optical element, instead of support via the guide ball 240 such as the anti-vibration mechanisms 313 and 413, a plurality of axes whose axes are oriented in a direction perpendicular to the first optical axis O1. It is also possible to use support by a guide shaft.

  In the vibration isolating mechanism 13 of the first embodiment, the outer centers of the permanent magnets 81 and 82 and the coils 83 and 84 are offset with respect to the sensor defining surfaces K1 and K2, and the vibration isolating mechanisms of the second to fourth embodiments. 113, 313, and 413, the outer center of the permanent magnets 181, 182, 381, 382, 481, 482 and the coils 183, 184, 383, 384, 483, 484 are generally sensor defining surfaces K 11, K 12, K 31, K 32, K 41. , K42. As can be seen from these embodiments, in the present invention, the outer centers of the two actuators may be located on the two corresponding sensor defining surfaces, or are offset with respect to the two corresponding sensor defining surfaces. May be.

  Further, the present invention does not limit the driving means for operating the image stabilizing optical element, as long as it satisfies the condition that it can support high-speed image stabilizing driving and requires the position detection of the image stabilizing optical element during driving. It is also possible to use actuators other than the voice coil motor. For example, an actuator using a piezoelectric element is also established. When a voice coil motor is used as an actuator, instead of a moving magnet type voice coil motor in which permanent magnets are supported on the first lens frames 30, 130, 330, and 430 that are movable members as in the illustrated embodiment, the first lens is used. A moving coil type voice coil motor in which coils are supported on the frames 30, 130, 330, and 430 can also be employed. In the moving coil type, a permanent support is supported on a fixed support member (housing 20, sensor holder 31, cover member 32, base frame 250, etc.), and the Hall sensor is a movable member (first lens frames 30, 130, 330, 430). ) Support on the side.

DESCRIPTION OF SYMBOLS 10 Imaging unit 13 Anti-vibration mechanism 14 Imaging sensor 15 Imaging sensor board 20 Housing (support member)
21 Rear support plate 21a Assembly opening 22 Box-shaped part 23 First support part 23a Prism holding frame 23b Insertion space 23c Engagement protrusion 23d Engagement protrusion 24 Second support part 24a Prism holding frame 25 Support seat 25a Screw hole 26 Extension protrusion Part 27 Spring support protrusion 28 Biasing arm support protrusion 30 First lens frame (movable member)
31 Sensor holder (support member)
32 Cover member (support member)
36 Energizing arm 36a Support plate portion 36b Pressing step portion 36c 36d Engagement hole 36e Bending support portion 37 Coil spring 40 Lens holding portion 41 Support portion 41a Backward extending portion 41b Pivoting arm 41c Curved surface 42 43 Magnet holding portion 44 Pivoting convex portion 45 Guide part 45a Opposing surface 46 (46L, 46R, 46U, 46D) Position restriction protrusion (movement restriction part, protrusion part)
60 Base plate portion 61 62 Sensor support projection 63 Mounting portion 64 Free fitting hole 65 Pivot recess 66 Rotation restricting projection 67 Mounting screw 67a Shaft portion 67b Head 68 Washer 70 Side wall 71 Front wall 72 Shooting opening 73 Engagement hole 74 Engagement hole 75 Coil mounting portion 76 (76L, 76R, 76U, 76D) Position restriction surface (movement restriction portion, contact surface)
81 82 Permanent magnet (actuator, voice coil motor)
83 84 Coil (Actuator, Voice coil motor)
83a 84a Long side portion 83b 84b Curved portion 85 86 Hall sensor (detection member, magnetic sensor)
85a 86a Center 87 of sensor sensing part 88 Coil support member 89 Control part 113 Anti-vibration mechanism 130 First lens frame (movable member)
140 Lens holding part 141 Support part 141a Backward extension part 141b Bridge part 141c Pivot arm 141d Curved surface 142 143 Magnet holding part 144 Pivot convex part 146 (146L, 146R, 146U, 146D) Position restriction protrusion (movement restriction part, protrusion) Part)
176 (176L, 176R, 176U, 176D) Position restriction surface (movement restriction part, contact surface)
181 182 Permanent magnet (actuator, voice coil motor)
183 184 Coil (Actuator, Voice coil motor)
183a 184a Long side portion 183b 184b Curved portion 185 186 Hall sensor (detection member, magnetic sensor)
185a 186a Center of sensor sensing portion 213 Anti-vibration mechanism 230 First lens frame 231 Lens holding portion 232 Outer peripheral projection 233 Ball contact surface 234 Spring hooking projection 235 Movement restriction hole (movement restriction portion)
236 237 Magnet holding part 240 Guide ball 241 Tension spring 250 Base frame (support member)
251 Prism holding frame 252 253 Sensor support part 254 Movement restriction protrusion (movement restriction part)
255 Ball support hole 256 Spring projection 281 282 Permanent magnet 283 284 Coil 283a 284a Long side portion 283b 284b Curved portion 285 286 Hall sensor 285a 286a Center of sensor sensing portion 313 Vibration isolation mechanism 330 First lens frame (movable member)
336 337 Magnet holder 381 382 Permanent magnet (actuator, voice coil motor)
383 384 Coil (Actuator, Voice coil motor)
383a 384a Long side portion 383b 384b Curved portion 385 386 Hall sensor (detection member, magnetic sensor)
385a 386a Center 413 of sensor sensing portion Anti-vibration mechanism 430 First lens frame (movable member)
436 437 Magnet holder 481 482 Permanent magnet (actuator, voice coil motor)
483 484 Coil (Actuator, Voice coil motor)
483a 484a Long side part 483b 484b Curved part 485 486 Hall sensor (detection member, magnetic sensor)
485a 486a Center of sensor sensing part A1 Oscillation center (Oscillation center point)
E1 E2 E21 E22 Actuator thrust E31 E32 E41 E42 Actuator thrust F1 F2 Hall sensor output change G1 1st group G2 2nd group G3 3rd group G4 4th group K1 K2 K11 K12 Sensor regulation surface K21 K22 K31 K32 K41 K42 Sensor defining surface L1 L21 First lens (anti-vibration optical element)
L1-a entrance surface L1-b exit surface L2 second lens L11 L211 first prism (reflection optical element)
L11-a L211-a Incident surface L11-b L211-b Outgoing surface L11-c Reflecting surface L12 Second prism L12-a Incident surface L12-b Outgoing surface L12-c Reflecting surface M Lens drive motor O1 First optical axis ( Optical axis of anti-vibration optical element)
O2 Second optical axis (optical axis after bending)
O3 Third optical axis P1 P2 Reference plane (center plane)
Q1 Q2 Q11 Q12 Magnetic pole boundary line Q21 Q22 Q31 Q32 Q41 Q42 Magnetic pole boundary line Z1 Z2 Z11 Z12 Crossing angle of two sensor-defined surfaces Z21 Z22 Z31 Z32 Z41 Z42 Crossing angle of two sensor-defined surfaces

Claims (7)

A movable member that holds a vibration-proof optical element constituting the imaging optical system and is supported by a support member so as to be movable with a component in a direction perpendicular to the optical axis of the vibration-proof optical element;
A movement restricting portion for mechanically restricting a movement range of the movable member relative to the support member;
An actuator that applies a driving force to the movable member in accordance with a shake applied to the imaging optical system to perform an image shake suppression operation; and two detection members that detect position changes of the movable member in two different directions by the actuator. ;
Have
Two defined surfaces that pass through the center of the sensing part of the two detection members and the optical axis of the anti-vibration optical element and are parallel to the optical axis are non-orthogonal formed of a combination of an acute angle and an obtuse angle. Crossing in a relationship; and moving the movable member along a central plane passing through the center of the acute angle crossing angle of the two defined surfaces to a moving end that is restricted by the movement restricting unit, Calibration of two detection members;
An anti-vibration mechanism for an image pickup apparatus. In the image stabilizer of the imaging device according to claim 1,
Each of the actuators is composed of two voice coil motors each composed of a permanent magnet and a coil, and provided with different positions in the circumferential direction around the optical axis of the anti-vibration optical element,
The two detection members are composed of two magnetic sensors provided at different positions in the circumferential direction around the optical axis of the anti-vibration optical element,
An anti-vibration mechanism for an imaging apparatus in which the two permanent magnets are supported by one of the movable member and the support member, and the two coils and the two magnetic sensors are supported by the other of the movable member and the support member. 3. The vibration isolating mechanism for an image pickup apparatus according to claim 1, wherein the movable member with respect to the support member is a sphere centered on a swing center point located on an extension of an optical axis of the vibration isolating optical element. It is supported so that it can swing,
The movement restriction unit is
Four protrusions provided at substantially equal intervals in the circumferential direction around the optical axis of the anti-vibration optical element at the peripheral edge of the movable member; and the support member formed at a position surrounding the peripheral edge of the movable member And four contact surfaces with which the four protrusions of the movable member abut;
An anti-vibration mechanism for an imaging apparatus having In the vibration isolating mechanism of the imaging device according to claim 3, which refers to claim 2,
One of the two voice coil motors generates a thrust along a tangential plane of a spherical surface centered on the swing center point and along one of the two prescribed surfaces by energizing the coil.
The other of the two voice coil motors generates a thrust along a tangential plane of the spherical surface centered on the swing center point and in a direction along the other of the two prescribed surfaces by energizing the coil.
One of the two voice coil motors and one of the two magnetic sensors, the other of the two voice coil motors and the other of the two magnetic sensors are each in the radial direction of the spherical surface centered on the oscillation center point. An anti-vibration mechanism for an imaging device arranged side by side. The vibration-proof mechanism of the imaging device according to claim 1 or 2, wherein the movable member is supported so as to be movable along a plane perpendicular to the optical axis of the vibration-proof optical element with respect to the support member.
A protrusion provided on one of the support member and the movable member and protruding in a direction along the optical axis of the vibration isolating optical element, and an inner surface of a hole formed on the other of the support member and the movable member and into which the protrusion is inserted Is a vibration isolation mechanism of the image pickup apparatus that constitutes the movement restriction unit. In the vibration isolating mechanism of the imaging device according to claim 5, which refers to claim 2,
One of the two voice coil motors generates a thrust along a plane perpendicular to the optical axis of the prevention optical element and along one of the two prescribed surfaces by energizing the coil.
The other of the two voice coil motors generates a thrust along the other of the two prescribed surfaces along the plane perpendicular to the optical axis of the prevention optical element by energizing the coil,
One of the two voice coil motors, one of the two magnetic sensors, the other of the two voice coil motors, and the other of the two magnetic sensors are each in a direction parallel to the optical axis of the anti-vibration optical element. Anti-vibration mechanism for imaging devices arranged side by side. 7. The image stabilization mechanism of the imaging apparatus according to claim 1, wherein the imaging optical system includes a reflective optical element that reflects a light beam that has passed through the image stabilization optical element, and the center plane is An anti-vibration mechanism for an imaging apparatus, which is a surface including a post-bending optical axis along a light beam reflected by the reflective optical element.

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