JP2011118284A - Image blur correcting apparatus and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image blur correcting apparatus which can be miniaturized as a whole. <P>SOLUTION: The image blur correcting apparatus includes: a holding member 21 holding a correction lens 15; a guide member 31 supporting the holding member 21, to make it movable in a first direction (Y direction); a fixed member 41 supporting the guide member 31 to which the holding member 21 is attached to be movable in the Y direction, to make the guide member 31 movable in a second direction (X direction); a first drive coil 52 moving the holding member 21 in the Y direction and a second drive coil 57 moving the holding member 21 in the X direction, which are disposed on one side in the Y direction in the coil attachment surface of the holding member 21; and a first magnet 53 disposed to face the first drive coil 52 and a second magnet 58 disposed to face the second drive coil 57, in the fixed member 41. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image blur correction apparatus and an imaging apparatus that correct image blur caused by vibration during imaging.

  Currently, imaging devices such as compact cameras and video cameras are required to be downsized, have high magnification, and have high pixels, and when photographing a subject, the frequency of acquiring an image blurred due to camera shake increases. In general, an image blur correcting apparatus that solves such a problem corrects a user's camera shake by driving a holding member that holds a correction lens in two directions orthogonal to each other in a plane perpendicular to the optical axis. Yes. As an actuator, a flat coil and a magnet are provided for each driving direction, and an electromagnetic force obtained by applying a voltage to the flat coil is generally used as a thrust of a holding member that holds a correction lens. Also in Patent Documents 1 and 2, a drive coil and a magnet for moving the holding member in the first direction, and a drive coil and a magnet for moving the holding member in the second direction orthogonal to the first direction A magnet is provided.

  It is necessary to reduce the size of the image blur correction device while maintaining the drive performance of the holding member of the correction lens.

  In an imaging apparatus such as a compact camera or a video camera, it may be necessary to reduce the width of one of the image blur correction apparatuses in accordance with the overall shape of the device body. However, in Patent Document 1, a drive coil and a magnet are arranged on a line where the center of the correction lens moves in the first direction and the second direction. Accordingly, such an image blur correction apparatus has a substantially square shape with the correction lens as the center, and it is difficult to further reduce the width of one of the image blur correction apparatuses.

  In Patent Document 2, magnets are arranged on both sides of the drive coil. For this reason, it is possible to further reduce the width of either one of the image blur correction apparatuses, but the image blur correction apparatus is increased in size in the optical axis direction.

  Furthermore, the position of the correction lens holding member is detected by a magnetic sensor, and an input signal to the magnetic sensor uses a magnet as an actuator. Therefore, the magnet mounting accuracy affects the driving performance and position detection accuracy of the holding member of the correction lens. Until now, the driving performance and position detection accuracy of the holding member have been ensured by accurately attaching the magnets provided corresponding to the respective directions to predetermined positions. For this reason, in the assembly process of the image blur correction apparatus, the magnet positioning process is required at least twice.

JP-A-9-269520 JP-A-10-311995

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an image blur correction apparatus and an imaging apparatus capable of reducing the overall size.

  It is another object of the present invention to provide an image blur correction apparatus and an imaging apparatus that can be reduced in size while sufficiently securing the drive performance and position detection accuracy of a holding member that holds a correction lens.

  In order to solve the above-described problem, an image blur correction device according to the present invention includes a holding member that holds either a correction lens or an imaging element, and the holding member in a first direction on a plane perpendicular to the optical axis. A guide member that is movably supported on the guide member, and a guide member on which the holding member is attached so as to be movable in the first direction. The movable member is movably supported on the coil mounting surface of either the holding member or the fixing member, and is moved toward one side of the first direction or the second direction. A first driving coil that moves the holding member in the first direction, a second driving coil that moves the holding member in the second direction, and the holding member or the fixing member. Install the other coil In parallel magnet mounting surface and includes a second magnet disposed so as to face the first magnet and the second driving coil which is disposed so as to face the first driving coil.

  Further, an imaging apparatus according to the present invention includes a holding member that holds either the correction lens or the imaging element, and a guide member that supports the holding member so as to be movable in a first direction on a plane perpendicular to the optical axis. A fixing member that supports the guide member to which the holding member is movably attached in the first direction so as to be movable in a second direction orthogonal to the first direction on a plane perpendicular to the optical axis; The holding member disposed on one side of either the first direction or the second direction on the coil mounting surface of either the holding member or the fixing member. A first drive coil that moves in the first direction, a second drive coil that moves the holding member in the second direction, and the other coil mounting surface of the holding member or the fixing member; Parallel magnet mounting surface There are, and a second magnet disposed so as to face the first magnet and the second driving coil which is disposed so as to face the first driving coil.

  According to the present invention, the first and second drive coils are brought close to one side of either the first direction or the second direction on the coil mounting surface of either the holding member or the fixing member. Is disposed. The first and second magnets attached to the attachment plate are disposed on either the holding member or the fixing member so as to face the first and second drive coils. Therefore, in the present invention, the width direction can be reduced without increasing the thickness in the optical axis direction.

1 is a perspective view of a video camera to which the present invention is applied. It is a perspective view of a lens barrel used for a video camera to which the present invention is applied. 1 is an exploded perspective view of a lens barrel to which the present invention is applied. It is a disassembled perspective view of the image blur correction mechanism used for the lens barrel to which the present invention is applied. It is a top view of the holding member which comprises an image blurring correction mechanism. It is a top view of the fixing member which comprises an image blurring correction mechanism. It is a top view which shows the 1st and 2nd attachment state attached to the bottom face part of a fixing member. It is a rear view which shows the 1st and 2nd attachment state attached to the bottom face part of a fixing member, and shows the state before an attachment board is attached to a fixing member. It is a rear view which shows the 1st and 2nd attachment state attached to the bottom face part of a fixing member, and shows the state in which the attachment plate was attached to the fixing member. It is sectional drawing which shows the state by which a mounting plate is fixed to a fixing member. It is the perspective view which looked at the image blurring correction mechanism to which this invention was applied from back. It is a perspective view which shows the modification of this invention. It is a block diagram of a video camera provided with an image blur correction mechanism.

  A video camera to which an image pickup apparatus using an image blur correction apparatus according to the present invention is applied will be described below with reference to the drawings. In the column of the embodiment for carrying out the invention, application examples of the present invention will be described in the following order.

(1) Description of video camera (2) Description of imaging unit (3) Description of image blur correction mechanism (3-1) Description of holding member (3-2) Description of guide member (3-3) Fixed member Explanation (3-4) Explanation of Drive Unit (3-5) Explanation of Operation of Image Blur Correction Mechanism (3-6) Explanation of Effect (3-7) Modified Example (4) Circuit Configuration of Video Camera

(1) Outline Description of Video Camera As shown in FIG. 1, a video camera 1 to which the present invention is applied is a video camera that can be held and operated with one hand, and is rotated by a device main body 2 and the device main body 2. And a display panel 3 connected to each other. The video camera 1 uses, as a recording medium, a hard disk built in the device main body 2, an IC card called a memory card, an optical disc called DVD (Digital Versatile Disc), BD (Blu-ray Disc), and the like. The device main body 2 uses an image pickup device such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) sensor to obtain an electrical signal from an optical image captured via the image pickup lens of the image pickup unit 4 on the front surface. Then, it is recorded on the recording medium described above. The display panel 3 of the device main body 2 reproduces and displays moving image data recorded on a recording medium, moving image data being shot, and the like. In addition, data such as moving image data recorded on a recording medium and moving image data being shot is displayed on a viewfinder 5 provided on the back surface of the device body 2. In addition, a battery pack that supplies power to the device main body 2 and the display panel 3 is mounted inside or outside the device main body 2. In addition, the device body 2 is formed with a grip belt 6 for fixing the user's hand.

  The display panel 3 attached to one side surface of the device main body 2 is rotatably attached by a hinge mechanism. For example, a liquid crystal display panel on which a touch panel is superimposed is used as the display panel 3, which serves as a display unit that displays an image and also functions as an operation panel. The display panel 3 may be an organic EL (Electroluminescence) panel in addition to a liquid crystal panel.

(2) Description of Imaging Unit As shown in FIGS. 2 and 3, the imaging unit 4 provided above the front side of the device main body 2 incorporates a lens barrel 10. This lens barrel 10 holds the first group lens 11 by the first group lens holding frame 11a, the second group lens 12 by the second group lens holding frame 12a, and the fourth group lens 14 by the fourth group lens holding frame 14a. is doing. In FIG. 3, the third group lens is omitted. Further, the lens barrel 10 is attached with a fixing member 41 serving as a fixed barrel for holding the fifth group lens 15. The 1st group lens 11-5 group lens 15 is arrange | positioned in series so that an optical axis may be made to correspond. Further, the imaging element 16 is attached to the bottom surface of the fixing member 41 so that the optical axes thereof coincide with each other.

  Here, the second group lens 12 functions as a zoom lens, and the second group lens holding frame 12a is guided by a guide shaft and attached so as to be movable in the optical axis direction by a zoom driving unit (not shown). The fourth group lens 14 functions as a focus lens, and the fourth group lens holding frame 14a is also guided by a guide shaft, and is attached to be movable in the optical axis direction by a focus drive unit (not shown). The fifth group lens 15 functions as a correction lens that corrects image blur, and the image blur correction mechanism 20 is provided on the fixed member 41. Hereinafter, the fifth group lens 15 is referred to as a correction lens 15.

(3) Description of Image Blur Correction Mechanism As shown in FIG. 4, the image blur correction mechanism 20 includes a holding member 21 that holds the correction lens 15 and a guide member that supports the holding member 21 so as to be movable in the first direction. 31. Further, the image blur correction mechanism 20 includes a fixing member 41 that supports the guide member 31 to which the holding member 21 is attached so as to be movable in the second direction.

(3-1) Description of Holding Member As shown in FIG. 4, the holding member 21 forms a substantially rectangular plate-like body, and approaches the one side in the longitudinal direction (upper side in FIG. 4), and the correction lens 15. A lens seating surface portion 22 is formed as an attachment hole. The correction lens 15 is fixed to the lens seat surface portion 22 by injecting an adhesive or the like. On the other side in the longitudinal direction of the holding member 21 (the lower side in FIG. 4), that is, on the lower side of the correction lens 15, a drive coil 52 that constitutes a first drive unit 51 and a second drive unit 56 described later It is the coil arrangement | positioning part 23 by which 57 is arrange | positioned. This coil arrangement | positioning part 23 becomes a flat coil attachment surface, and becomes parallel with the bottom face part 41a of the fixing member 41 after an assembly.

  The holding member 21 having a substantially rectangular shape is formed with first guide portions 24 and 25 for guiding movement in the first direction (Y direction in FIG. 4) along the opposing long sides.

  The first guide portion 24 is provided along one long side of the holding member 21 and has one or a plurality of guide holes or guide recesses through which the first main shaft 24a is inserted. Further, the first guide portion 25 is provided along the other long side of the holding member 21, and one or a plurality of guide holes or guide recesses through which the first sub shaft 25a shorter than the first main shaft 24a is inserted. have. The first main shaft 24a and the first sub shaft 25a are inserted into or engaged with the first and second guide portions 24 and 25, and are supported in a state parallel to the Y direction.

(3-2) Description of Guide Member In the holding member 21 as described above, the guide member 31 is attached to the surface on the imaging light incident side. The guide member 31 also has a substantially rectangular plate shape as a whole, and is formed to have substantially the same size as the holding member 21. The guide member 31 is formed with a through-hole 32 slightly larger than the correction lens 15 corresponding to the correction lens 15 attached to the lens seat surface portion 22 toward one side in the longitudinal direction (upper side in FIG. 4). ing. The guide member 31 is provided with first main shaft fixing portions 33 and 33 to which the first main shaft 24 a inserted through the first guide portion 24 of the holding member 21 is fixed. The first main shaft fixing portions 33 are formed at both end portions of one long side. The first main shaft fixing portions 33, 33 have mounting holes or the like, and each end portion of the first main shaft 24a is press-fitted into the mounting hole, and is further fixed with an adhesive or the like. Further, on the other long side of the guide member 31, first countershaft fixing portions 34, 34 to which the first countershaft 25 a inserted through the first guide portion 25 of the holding member 21 is fixed are provided. ing. The first countershaft fixing portions 34, 34 have mounting holes and the like, and each end portion of the first countershaft 25a is press-fitted into the mounting hole and further fixed with an adhesive or the like.

  That is, the first main shaft 24a and the first auxiliary shaft 25a are inserted into or engaged with the first guide portions 24, 25 in the guide member 31, and both ends of the first main shaft 24a are the first main shaft fixing portions. The first countershaft 25a is fixed to the first countershaft fixing portions 34, 34. Accordingly, the holding member 21 is attached to the guide member 31 so as to be movable in the first direction (Y direction in FIG. 4).

  Furthermore, the guide member 31 having a substantially rectangular shape is provided with a second guide portion 35 that guides the movement in the second direction (X direction in FIG. 4) orthogonal to the first direction along the opposing short sides. 36 is formed.

  The second guide portion 35 is provided along one short side of the guide member 31, and has one or a plurality of guide holes or guide recesses through which the second main shaft 35a is inserted. Further, the second guide portion 36 is provided along the other short side of the guide member 31, and one or a plurality of guide holes or guide recesses through which the second auxiliary shaft 36a shorter than the second main shaft 35a is inserted. have. The first and second guide portions 35 and 36 are inserted through the second main shaft 35a and the second sub shaft 36a in parallel with each other in the second direction (X direction in FIG. 4). .

  A yoke 37 is disposed on one main surface side of the guide member 31 so as to substantially correspond to positions of first and second drive coils 52 and 57 to be described later. The yoke 37 is attached to a fixing member 41 described later.

(3-3) Description of Fixing Member The guide member 31 to which the holding member 21 is attached so as to be movable in the first direction (Y direction in FIG. 4) is further attached to the fixing member 41. The fixing member 41 is formed in a substantially rectangular box shape, and a substantially rectangular attachment opening 42 for attaching the guide member 31 is formed on one surface. Further, a substantially circular through hole 43 is formed in the bottom surface portion 41 a of the fixing member 41 corresponding to the position of the correction lens 15 of the holding member 21 attached to the guide member 31 attached to the fixing member 41. Yes. The imaging element 16 is disposed outside the bottom surface portion 41 a of the fixing member 41. The through hole 43 allows the light beam that has passed through the correction lens 15 and the through hole 32 of the guide member 31 to be incident on the light receiving surface of the image sensor 16. The through hole 43 may be a lens necessary for entering the light receiving surface of the image sensor 16.

  In addition, the guide member 31 has a magnet placement portion 44 for placing a magnet on the other side in the longitudinal direction (lower side in FIG. 4). Details of the magnet arrangement portion 44 will be described later.

  The fixing member 41 is provided with second main shaft fixing portions 45, 45 to which the second main shaft 35 a inserted through the second guide portion 35 of the guide member 31 is fixed on the opposite side surfaces of the long side. ing. The second main shaft fixing portions 45, 45 are formed below the opposing side surface portions. The second main shaft fixing portions 45, 45 have mounting holes or the like, and each end portion of the second main shaft 35a is press-fitted into the mounting hole, and is further fixed with an adhesive or the like. The fixing member 41 is provided with second countershaft fixing portions 46, 46 to which the second countershaft 36 a inserted through the second guide portion 36 of the guide member 31 is fixed. The second countershaft fixing portions 46, 46 have mounting holes, mounting grooves, and the like, and each end of the second countershaft 36a is press-fitted into the mounting holes and mounting grooves, and further, an adhesive or the like is used. Fixed.

  That is, the second main shaft 35a and the second sub shaft 36a attached to the guide member 31 are inserted into or engaged with the second guide portions 35 and 36 in the fixing member 41, and both ends of the first main shaft 35a are inserted. Is fixed to the second main shaft fixing portions 45, 45, and the first auxiliary shaft 36 a is fixed to the second auxiliary shaft fixing portions 46, 46. Therefore, the guide member 31 to which the holding member 21 is attached is attached to the fixing member 41 so as to be movable in the second direction (X direction in FIG. 4).

(3-4) Description of Drive Unit As described above, the holding member 21 is attached to the guide member 31 so as to be linearly movable in the first direction (Y direction), and the guide member to which the holding member 21 is attached. 31 is attached to the fixing member 41 so as to be linearly movable in the second direction (X direction). The movement of the holding member 21 in the first direction (Y direction) is performed by the first driving unit 51, and the movement of the guide member 31 to which the holding member 21 is attached in the second direction (X direction) is performed. This is performed by the second drive unit 56.

  As shown in FIG. 5, the first drive unit 51 that moves in the first direction (Y direction) with respect to the guide member 31 includes a substantially rectangular first drive coil 52 that is a flat coil, And a first magnet 53 disposed to face the drive coil 52.

  The first drive coil 52 constituting the first drive unit 51 is attached so that the longitudinal direction thereof is the second direction (X direction) in the coil disposition portion 23 serving as the coil attachment surface of the holding member 21. . The first drive coil 52 is a drive center that is the center of the first drive coil 52 between the center G of the correction lens 15 and the first main shaft 24a along the first direction (Y direction). It arrange | positions so that P1 may be located. As a result, the first drive unit 51 reduces the rotational moment around the bearing generated by the drive force in the first direction (Y direction), and prevents the drive performance from deteriorating. A first magnetic sensor 54 is disposed at the center of the first drive coil 52 to detect the position of the holding member 21 in the first direction (Y direction) with respect to the fixing member 41. ing.

  The second drive coil 57 constituting the second drive unit 56 is attached so that the longitudinal direction thereof is the first direction (Y direction) in the coil disposition unit 23. The second drive coil 57 is a drive center that is the center of the second drive coil 57 between the center G of the correction lens 15 and the second main shaft 35a along the second direction (X direction). It arrange | positions so that P2 may be located. As a result, the second drive unit 56 reduces the rotational moment around the bearing generated by the drive force in the second direction (X direction), and prevents the drive performance from deteriorating. A second magnetic sensor 59 is disposed at the center of the second drive coil 57 to detect the position of the holding member 21 in the second direction (X direction) with respect to the fixing member 41. ing.

  On the other hand, as shown in FIGS. 4 and 6, one surface of the first magnet 53 constituting the first drive unit 51 and the second magnet 58 constituting the second drive unit 56 are magnet-attached. It attaches to the attachment plate 61 used as a surface. The mounting plate 61 is a substantially rectangular flat plate, and a first magnet 53 is mounted on one surface serving as a magnet mounting surface at a position facing the first driving coil 52, and facing the second driving coil 57. A second magnet 58 is attached to the position to be operated. The mounting plate 61 may be a non-magnetic synthetic resin plate, but here, a magnetic metal plate is used so as to function as a yoke.

  As shown in FIG. 6, the first magnet 53 facing the first drive coil 52 is magnetized so that the N pole and the S pole are aligned in the first direction (Y direction), and the second drive The second magnet 58 facing the coil 57 is magnetized so that the N pole and the S pole are aligned in the second direction (X direction). The first magnet 53 having a substantially rectangular shape is attached so that the longitudinal direction is the first direction (Y direction), and the second magnet 58 having a substantially rectangular shape is the second direction ( (X direction). The first magnetic sensor 54 and the second magnetic sensor 59 detect the change in the magnetic field generated by the first magnet 53 and the second magnet 58, respectively, so that the first of the holding member 21 with respect to the fixing member 41 is detected. The position in the direction (Y direction) or the second direction (X direction) is detected.

  The mounting plate 61 on which the first magnet 53 and the second magnet 58 are disposed is attached to the bottom surface portion 41a of the fixing member 41 from the outside, as shown in FIGS. In the bottom surface portion 41 a of the fixing member 41, the first magnet 53 faces the inside of the fixing member 41 on the magnet arrangement portion 44 formed near the other side in the longitudinal direction (the lower side in FIG. 4). A substantially rectangular first opening 53a is formed. In addition, a substantially rectangular second opening 58 a that allows the second magnet 58 to face the inside of the fixing member 41 is formed side by side with the first opening 53 a.

  As shown in FIG. 7, the first opening 53 a for the first magnet 53 is formed so that one side (the vertical side in FIG. 7) has substantially the same length as the long side of the first magnet 53. The other side adjacent to the one side (the horizontal side in FIG. 7) is formed to be longer than the short side of the first magnet 53. The first opening 53a is formed with a first gap 53b when the first magnet 53 is disposed.

  Further, the second opening 58a for the second magnet 58 is formed so that one side (the vertical side in FIG. 7) has substantially the same length as the short side of the second magnet 58, The adjacent other sides (lateral sides in FIG. 7) are formed so as to be longer than the long sides of the second magnet 58. The second opening 58a is formed with a second gap 58b when the second magnet 58 is disposed.

  The sizes of the first and second gap portions 53 b and 58 b correspond to the amount of sliding of the mounting plate 61 when the mounting plate 61 is mounted on the bottom surface portion 41 a of the fixing member 41.

  Next, a method of attaching the mounting plate 61 to the bottom surface portion 41a of the fixing member 41 will be described with reference to FIGS. 4, 6, 8, and 9. FIG. As shown in FIGS. 4, 6, and 7, the mounting plate 61 is a substantially rectangular flat plate, and is formed on the outer surface of the bottom surface portion 41 a of the fixing member 41 at the distal end portion serving as the insertion end in the longitudinal direction. A first engaged portion 62 for fixing is formed to protrude. In addition, an engagement recess 63 cut out in a V-shape with which the jig 60 is engaged is formed at the base end opposite to the tip of the mounting plate 61. Further, on both sides of the engaging recess 63, second engaged portions 64 for fixing to the outer surface of the bottom surface portion 41 a of the fixing member 41 are formed.

  On the outer surface of the bottom surface portion 41 a of the fixing member 41, first engagement pieces 65 a and 65 b are formed that engage with a first engaged portion 62 formed at the insertion end of the mounting plate 61 from both sides. . The first engagement pieces 65 a and 65 b are formed in a substantially L shape, and the first engaged portion 62 is fixed by the adhesive 66 in a state of being engaged with the first engaged portion 62. Is done. Specifically, the adhesive 66 is injected into the gap between the first engagement pieces 65a and 65b and the first engaged portion 62 from the direction of the arrow in FIG. , 65b and the first engaged portion 62 are fixed.

  Similarly, on the outer surface of the bottom surface portion 41 a of the fixing member 41, second engagement pieces 67 a that are engaged from both sides with a second engaged portion 64 formed on the side opposite to the insertion end of the mounting plate 61. 67b is formed. The second engagement pieces 67a and 67b are formed in a substantially L shape, and the second engaged portion 64 is fixed by the adhesive 66 in a state of being engaged with the second engaged portion 64. Is done. Specifically, the adhesive 66 is injected into the gap between the second engagement pieces 67a and 67b and the second engaged portion 64 from the direction of the arrow in FIG. 67b and the second engaged portion 64 are fixed.

  As described above, since the fixing member 41 fixes the attachment plate 61 to the outer surface of the bottom surface portion 41a, the adhesive 60 can be prevented from flowing into the inner side of the fixing member 41.

  Further, as shown in FIG. 7, the first opening 53 a of the bottom surface portion 41 a of the fixing member 41 has the first magnet 53 at the center of one side 68 a in the sliding direction of the first magnet 53. A first positioning protrusion 68 that contacts the opposing surface in the thickness direction is formed. The first positioning protrusion 68 is formed in a semi-cylindrical shape, and the opposed surface 68b of the first magnet 53 and the semicircular tip end are in line contact. The first positioning protrusion 68 is positioned against the opposing surface of the first magnet 53, thereby positioning the position in the first direction (Y direction).

  Further, in the second opening 58 a of the bottom surface portion 41 a of the fixing member 41, the central portion of the first side 69 b facing the insertion surface 69 a of the second magnet 58 disposed on the insertion end side of the mounting plate 61. In addition, a second positioning protrusion 69 is formed. The second positioning protrusion 69 is formed in a semi-cylindrical shape, and the insertion surface 69a of the second magnet 58 and the semicircular arc-shaped tip are in line contact. The second positioning protrusion 69 positions the position in the second direction (X direction) when the insertion surface 69a of the second magnet 58 is abutted against the second positioning protrusion 69.

  Further, in the second opening 58a, the auxiliary positioning protrusion 71 is formed on the first side 69b side of the second and third sides 71a and 71b perpendicular to the first side 69b adjacent to the first side 69b. , 71 are formed. The auxiliary positioning protrusions 71 and 71 are also formed in a semi-cylindrical shape, and the tip of the semicircular arc is in line contact with the surface in the sliding direction of the second magnet 58 adjacent to the insertion surface 69 a of the second magnet 58.

  As described above, the first and second magnets 53 and 58 that are bonded and fixed to the mounting plate 61 are abutted so as to be in line contact with the first positioning protrusion 68, and thus the first direction. Positioning in the (Y direction). Further, the first and second magnets 53 and 58 are positioned so as to be in line contact with the second positioning protrusion 69, thereby positioning in the second direction (X direction). The first and second magnets 53 and 58 are abutted against the first positioning protrusion 68 and the second positioning protrusion 69 that are spaced apart from each other, so that the first direction (Y direction) and the second Is accurately positioned in the direction (X direction).

  7 and 8, when the first and second magnets 53 and 58 are fixed to a predetermined position on one surface of the mounting plate 61 as a magnet mounting surface, the bottom surface portion of the fixing member 41 is provided. It is attached to the outer surface of 41a. That is, the first magnet 53 fixed to the mounting plate 61 is inserted into the first opening 53a, and the second magnet 58 is inserted into the second opening 58a. Then, the 1st and 2nd magnets 53 and 58 are located in the place shown with the dotted line in FIG. 7 in the 1st and 2nd opening part 53a, 58a. After that, the mounting plate 61 slides in one direction indicated by an arrow in FIG. 7 by engaging the substantially cylindrical jig 60 with the engaging recess 63. At this time, the jig 60 comes into contact with the substantially V-shaped engaging recess 63 at two points, and is biased in the direction of the first positioning protrusion 68 and the second positioning protrusion 69 to thereby perform the first positioning. The first magnet 53 is abutted against the protrusion 68, and the second magnet 58 is abutted against the second positioning protrusion 69.

  In this state, as shown in FIG. 9, the first engagement pieces 65a and 65b are engaged with the first engaged portion 62, and the second engagement pieces 67a and 67b are the second engaged pieces. Engage with the engaging portion 64. While maintaining this state, as shown in FIG. 10, by injecting the adhesive 66 from the direction of the arrow in FIG. 10, the first and second engagement pieces 65a, 65b, 67a, 67b and the first and first engagement pieces are injected. The two engaged portions 62 and 64 are fixed.

  Thus, as shown in FIGS. 7 and 11, the first and second magnets 53 and 58 are fixed in a state where the positioning is accurately performed in one direction (Y direction) and the second direction (X direction). It is fixed to the bottom surface of the member 41. When the guide member 31 in which the holding member 21 is attached to the fixing member 41 is attached, the attachment plate 61 becomes parallel to the coil placement portion 23 of the holding member 21, and the first and second magnets 53 and 58 are It is arranged at a predetermined position in the magnet arrangement part 44 in the fixing member 41. As a result, the first magnet 53 is disposed at a position close to the first drive coil 52 of the holding member 21 in a parallel state, and the second magnet 58 is arranged at the second drive coil 57 of the holding member 21. Are arranged in close proximity to each other.

  Since the first and second magnets 53 and 58 are attached to the attachment plate 61, the magnets are not disposed on both sides of the first and second drive coils 52 and 57 as in the prior art. Can be made thinner. The first and second drive coils 52 and 57 are arranged on the other side in the longitudinal direction of the holding member 21, and the first and second magnets 53 and 58 are also fixed by the mounting plate 61 in accordance with this. The member 41 is disposed on the bottom surface 41 a. Therefore, the whole can be reduced in size in the width direction.

  Further, the first and second magnets 53 and 58 are accurately arranged at predetermined positions in the magnet arrangement portion 44 in the fixing member 41. Therefore, the first and second magnetic sensors 54 and 59 disposed in the center of the first and second drive coils 52 and 57 attached to the holding member 21 are connected to the fixing member 41 of the holding member 21. The positions in the first direction (Y direction) and the second direction (X direction) can be accurately detected.

(3-5) Description of Operation of Image Blur Correction Mechanism Next, the operation of the image blur correction mechanism 20 configured as described above will be described.

  When the correction lens 15 is moved in the first direction (Y direction), the first drive unit 51 that drives the holding member 21 supplies a drive current to the first drive coil 52. The first driving unit 51 generates a driving force in the first direction (Y direction) according to the Fleming left-hand rule by the action of the direction of the supplied driving current and the magnetic field generated by the first magnet 53. appear. Therefore, the holding member 21 moves in the first direction (Y direction) with respect to the guide member 31 directly attached to the fixing member 41, and the correction lens 15 also moves in the same direction. The first drive unit 51 can move the holding member 21 in one of the first directions (Y direction) or move the holding member 21 in the other direction by switching the direction of the drive current.

  When the correction lens 15 is moved in the second direction (X direction), the second drive unit 56 that drives the holding member 21 supplies a drive current to the second drive coil 57. The second driving unit 56 generates a driving force in the second direction (X direction) according to the Fleming left-hand rule by the action of the direction of the supplied driving current and the magnetic field generated by the second magnet 58. appear. Therefore, the holding member 21 moves in the second direction (X direction) together with the guide member 31, and the correction lens 15 also moves in the same direction. The second drive unit 56 can move the holding member 21 in one of the second directions (X direction) or move the holding member 21 in the other direction by switching the direction of the drive current.

  As described above, the image blur correction mechanism 20 can move the holding member 21 holding the correction lens 15 independently in the first direction (Y direction) and the second direction (X direction). Then, image blur correction is performed by supplying a drive signal corresponding to a desired movement amount of the holding member 21 to the first and second drive units 51 and 56 in accordance with the camera shake amount of the photographer. be able to.

  The first and second magnetic sensors 54 and 59 are connected to the first direction (Y direction) and the second direction of the first and second drive coils 52 and 57 with respect to the first and second magnets 53 and 58, respectively. The position in the direction (X direction) is detected. The first and second magnetic sensors 54 and 59 can control the movement amount of the holding member 21 in the first direction (Y direction) and the second direction (X direction).

(3-6) Description of Effects In the image blur correction mechanism 20 configured as described above, the first and second magnets 53 and 58 are attached to the attachment plate 61. Therefore, in the image blur correction mechanism 20, no magnet is disposed on both sides of the first and second drive coils 52 and 57, and the size can be reduced without increasing the thickness in the optical axis direction. . The first and second drive coils 52 and 57 are arranged on the other side in the longitudinal direction of the holding member 21, and the first and second magnets 53 and 58 are also fixed by the mounting plate 61 in accordance with this. The member 41 is disposed on the bottom surface 41 a. Therefore, the whole can be reduced in size in the width direction.

  Further, as shown in FIG. 5, the first drive coil 52 is a first drive coil between the center G of the correction lens 15 and the first main shaft 24a along the first direction (Y direction). The drive center P1 which is the center of 52 is located. That is, the drive center P1, which is the center of the first drive coil 52, approaches the first main shaft 24a along the first direction (Y direction). Therefore, in the first driving unit 51, the rotational moment around the bearing generated by the driving force in the first direction (Y direction) can be reduced, and deterioration of the driving performance can be prevented. The second drive coil 57 is a drive center that is the center of the second drive coil 57 between the center G of the correction lens 15 and the second main shaft 35a along the second direction (X direction). It arrange | positions so that P2 may be located. That is, the drive center P2 that is the center of the second drive coil 57 approaches the second main shaft 35a along the second direction (X direction). As a result, the second driving unit 56 can reduce the rotational moment around the bearing generated by the driving force in the second direction (X direction), and can prevent the driving performance from deteriorating.

  Further, the first and second magnets 53 and 58 are arranged at predetermined positions in the magnet arrangement portion 44 in the fixing member 41. Therefore, the first and second magnetic sensors 54 and 59 disposed in the center of the first and second drive coils 52 and 57 attached to the holding member 21 are connected to the fixing member 41 of the holding member 21. The positions in the first direction (Y direction) and the second direction (X direction) can be accurately detected.

  In addition, the first and second magnets 53 and 58 can be attached to the fixing member 41 simply by using the attachment plate 61 and sliding the attachment plate 61 to which the first and second magnets 53 and 58 are attached. It can be fixed in a highly accurately positioned state. Therefore, the image blur correction mechanism 20 can simplify the assembly process.

(3-7) Modification In the image blur correction mechanism 20 described above, as shown in FIG. 11, the first engaged portion on the distal end side is fixed when the mounting plate 61 is fixed to the bottom surface portion 41 a of the fixing member 41. 62 is engaged by the first engagement pieces 65a and 65b.

  On the other hand, in the example shown in FIG. 12, the first engagement pieces 65a and 65b are the engagement holes 75 into which the first engaged portions 62 are inserted. Also in the example of FIG. 12, as in the above example, as shown in FIGS. 7 and 8, the mounting plate 61 to which the first and second magnets 53 and 58 are fixed is attached to the bottom surface portion 41 a of the fixing member 41. The first and second magnets 53 and 58 are inserted into the first and second openings 53a and 58a from the outside, and then the substantially cylindrical jig 60 is engaged with the engaging recess 63, so that FIG. 7 can be fixed by sliding in one direction indicated by an arrow.

  Therefore, as in the case described above, the assembly process can be simplified.

  In the above example, the case where the correction lens 15 is attached to the holding member 21 has been described. However, the imaging element 16 may be provided on the holding member 21 instead of the correction lens 15.

  Further, the video camera has been described above as an example, but the present invention can also be applied to a digital still camera, and further to a silver salt still camera.

(4) Circuit Configuration of Video Camera FIG. 13 is a block diagram of the video camera 1 provided with the image blur correction mechanism 20 as described above. The video camera 1 includes a control unit 81 that controls the overall operation of the lens barrel having the image blur correction mechanism 20, and a storage unit 82 that functions as a program memory and a data memory for driving the control unit 81. . In addition, the video camera 1 has an operation unit 83 for inputting various command signals for photographing, a display panel 3 for displaying captured images, a display unit 84 for configuring the viewfinder 5, and a memory capacity expansion. An external memory 85 or the like.

  The control unit 81 includes, for example, an arithmetic circuit having a microcomputer (CPU). The control unit 81 includes a storage unit 82, an operation unit 83, an analog signal processing unit 86, a digital signal processing unit 87, an A / D converter 88, a D / A converter 91, a timing generator ( TG) 92 is connected. The analog signal processing unit 86 is connected to the image sensor 16 and executes predetermined signal processing using an analog signal corresponding to a captured image output from the image sensor 16. The analog signal processing unit 86 is connected to an A / D converter 88, and the output is converted into a digital signal by the A / D converter 88.

  The D / A converter 91 is connected to a drive control unit 94 that performs servo calculation for image blur correction. The drive control unit 94 corrects the image blur by servo-controlling the image blur correction mechanism 20 in accordance with the position of the correction lens 15. The drive controller 94 detects the magnetic force of the first and second magnets 53 and 58 facing the first drive coil 52 and the second drive coil 57, for example, and detects the first direction of the holding member 21 ( A position detector 95 that detects positions in the Y direction) and the second direction (X direction) is connected. The position detection unit 95 is the first and second magnetic sensors 54 and 59 described above, and is, for example, a Hall element. Further, a shake detection unit 93 that detects the shake of the video camera 1 is connected to the drive control unit 94. The shake detection unit 93 is, for example, a gyro sensor. The timing generator (TG) 92 is connected to the image sensor 16.

  Thus, when an image is formed on the imaging surface of the image sensor 16 via the lens system of the subject, the image signal is output as an analog signal, and after the analog signal processing unit 86 executes predetermined processing, the A / The digital signal is converted by the D converter 88. An output from the A / D converter 88 is displayed on the display unit 84 as an image corresponding to the subject after predetermined processing is executed by the digital signal processing unit 87 or stored as storage information in the external memory 85. .

  In such a shooting state, the image blur correction mechanism 20 is in an operating state, and when the video camera 1 is shaken or shaken, the shake detection unit 93 detects the shake or shake and the detection signal is transmitted to the drive control unit. Output to 94. The drive controller 94 supplies a drive current according to a predetermined drive signal to the first drive coil 52 and the second drive coil 57. Accordingly, the holding member 21 moves in the first direction (Y direction) and the second direction (X direction) with respect to the fixing member 41. Along with this, the correction lens 15 also moves in the same direction together with the holding member 21, and image blur is eliminated.

  When the image blur correction mechanism 20 holds the image sensor 16, the drive control unit 94 supplies the drive current according to the shake or shake detected by the shake detection unit 93 to the first drive coil 52 or the second drive coil. 57. Along with this, the image pickup device 16 also moves in the same direction together with the holding member 21, and the image blur is eliminated.

DESCRIPTION OF SYMBOLS 1 Video camera, 2 apparatus main body, 3 display panel, 4 imaging part, 5 viewfinder, 6 grip belt, 10 lens barrel, 11 1st group lens, 11a 1st group lens holding frame, 12 2nd group lens, 12a Frame, 144th lens group, 14a 4th lens lens holding frame, 15th 5th lens group (correction lens), 16 image sensor, 20 image blur correction mechanism, 21 holding member, 22 lens seating surface portion, 23 coil arrangement portion, 24, 25 guide portion, 24a first main shaft, 25a first sub shaft, 31 guide member, 32 through hole, 33 main shaft fixing portion, 34 sub shaft fixing portion, 35, 36 guide portion, 35a second main shaft, 36a first 2 secondary shaft, 37 yoke, 41 fixing member, 41a bottom surface portion, 42 mounting opening, 43 through-hole, 44 magnet mounting portion, 45, 45 main shaft fixing portion, 46, 46 secondary shaft fixing portion, 51 1st drive part, 52 1st drive coil, 53 1st magnet, 53a 1st opening part, 53b space | gap part, 54 1st magnetic sensor, 56 2nd drive part, 57 2nd drive Coil, 57 second drive coil, 58 second magnet, 58a second opening, 58b gap, 59 second magnetic sensor, 60 jig, 61 mounting plate, 62 first engaged portion, 63 engagement recess, 64 second engaged portion, 65a, 65b first engagement piece, 66 adhesive, 67a, 67b second engagement piece, 68 first positioning projection, 68a one side ,
68b opposing surface, 69 second positioning projection, 69a insertion surface, 69b first side, 71 auxiliary positioning projection, 71a second piece, 71b third side, 75 engagement hole,

Claims (7)

A holding member that holds either the correction lens or the imaging element;
A guide member that supports the holding member so as to be movable in a first direction in a plane perpendicular to the optical axis;
A fixing member for supporting the guide member, to which the holding member is movably attached in the first direction, movably in a second direction orthogonal to the first direction in a plane perpendicular to the optical axis;
The holding member disposed on one side of either the first direction or the second direction on the coil mounting surface of either the holding member or the fixing member is arranged as described above. A first drive coil that moves in a first direction and a second drive coil that moves the holding member in the second direction;
A first magnet and a second drive coil arranged to face the first drive coil on a magnet mounting surface parallel to the coil mounting surface on the other side of either the holding member or the fixing member An image blur correction apparatus comprising: a second magnet disposed so as to oppose the head. The holding member is movably guided in the first direction by a first main shaft and a first sub shaft attached to the guide member, and a second main shaft attached to the fixed member. And the second countershaft are guided so as to be movable in the second direction,
The drive center of the first drive coil is located between the center of the correction lens or the image sensor and the first main axis,
The image blur correction apparatus according to claim 1, wherein a drive center of the second drive coil is located between a center of the correction lens or the image sensor and the first main axis. The first magnet and the second magnet are attached to the same mounting plate,
The mounting plate to which the first and second magnets are mounted is configured such that the first and second magnets are connected to the first and second magnets from an outer surface of the fixing member and from an opening formed in the fixing member. The image blur correction device according to claim 2, wherein the image blur correction device is attached so as to face the driving coil of the image blur. The image blur correction device according to claim 3, wherein the mounting plate is a yoke. The fixing member includes a first engagement piece that engages with the insertion end of the mounting plate and a second engagement piece that engages with the insertion plate on the side opposite to the insertion end in the vicinity of the opening. And
The image blur correction device according to claim 3, wherein the mounting plate to which the first and second magnets are attached is locked and fixed to the first and second engaging pieces by sliding. A first positioning protrusion for positioning the first and second magnets in the first direction and a positioning protrusion in the second direction are formed on the inner surface of the fixing member near the opening. Provided,
The image blur correction device according to claim 5, wherein the first and second positioning protrusions are in line contact with the first and second magnets to position the first and second magnets. A holding member that holds either the correction lens or the imaging element;
A guide member that supports the holding member so as to be movable in a first direction in a plane perpendicular to the optical axis;
A fixing member for supporting the guide member, to which the holding member is movably attached in the first direction, movably in a second direction orthogonal to the first direction in a plane perpendicular to the optical axis;
The holding member disposed on one side of either the first direction or the second direction on the coil mounting surface of either the holding member or the fixing member is arranged as described above. A first drive coil that moves in a first direction and a second drive coil that moves the holding member in the second direction;
A first magnet and a second drive coil arranged to face the first drive coil on a magnet mounting surface parallel to the coil mounting surface on the other side of either the holding member or the fixing member And a second magnet disposed so as to oppose to the imaging device.

Images