JP6097616B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device that performs image blur correction by moving a lens in a direction orthogonal to an optical axis.

  Conventionally, there is JP-A-2002-196382 as a technical document in such a field. This publication describes a shake correction apparatus that can be incorporated into a photographing apparatus or an observation apparatus. The shake correction apparatus includes a shake correction lens that moves in a plane perpendicular to the optical axis to perform a shake correction operation, and a shift member that shifts the shake correction lens in a plane perpendicular to the optical axis with respect to the apparatus body. It is equipped with. A ball is disposed between the apparatus main body and the shift member, and the ball can move within a restriction frame formed in a concave shape in the apparatus main body. When the restriction frame is viewed from the optical axis direction, the shape is a square. When the radius of the ball is r, the movement amount of the ball is b, and the mechanical margin is c, the length of one side of the restriction frame The length is (r + b + c).

JP 2002-196382 A

  Here, in the restriction frame as described above, since the sphere is arranged between the apparatus main body and the shift member, the shift member can be smoothly moved in a plane orthogonal to the optical axis. However, since the limiting frame in which the sphere is arranged is formed in a concave shape in the apparatus main body, the thickness of the portion of the apparatus main body where the limiting frame is formed is thin. Therefore, if the area of the restriction frame in which the sphere is movable is enlarged, the area of the thin part is enlarged, and the strength of the apparatus main body may be reduced.

  Accordingly, an object of the present invention is to provide a lens driving device that can secure a moving amount of a sphere and reduce an area of a thin portion.

  In order to solve the above-described problems, the present invention provides a lens driving device having a lens holding frame that holds a lens and is movably supported in a plane perpendicular to the optical axis within the frame. A driving unit that moves in a plane orthogonal to the optical axis, a sphere that is disposed in a space formed by the frame and the lens holding frame, and that supports the lens holding frame with respect to the frame in the optical axis direction; The concave portion formed in the frame body or the concave portion formed in the lens holding frame includes a columnar first sphere housing portion formed by a bottom surface supporting the sphere and a side surface rising from the bottom surface, and a first And a cylindrical second sphere accommodating portion having an enlarged diameter on the open side of the sphere accommodating portion.

  According to the lens driving device of the present invention, the recess for accommodating the sphere is provided in the frame or the lens holding frame. The concave portion of the frame body or the concave portion of the lens holding frame has a cylindrical first sphere accommodating portion and a cylindrical second sphere accommodating portion whose diameter is increased on the open side of the first sphere accommodating portion. The stepped cylindrical shape is provided with a small-diameter first sphere housing portion and a large-diameter second sphere housing portion. Thus, in this invention, the recessed part for accommodating a spherical body becomes a column shape which has a stepped part, and the 1st ball accommodation diameter-reduced with respect to the 2nd ball accommodation part in the lower step Therefore, it is possible to reduce the region where the thickness in the optical axis direction and the direction orthogonal to the optical axis is thin by the height of the stepped portion, compared to the case where the first ball housing portion is not provided. As a result, it is possible to reduce a region having a thickness that tends to be thin. In addition, since the second sphere accommodating portion whose diameter is increased with respect to the side surface of the first sphere accommodating portion is provided on the open side of the first sphere accommodating portion, the second sphere accommodating portion is provided. The amount of movement of the sphere in the direction perpendicular to the optical axis can be increased as compared with the case where the optical axis is not.

Further, when the radius of the sphere is “r”, the radius of the first sphere housing portion is “X”, and the movement amount of the sphere from the center of the first sphere housing portion is “a”, r <X <R + a is satisfied.

  In the above configuration, the diameter of the first sphere accommodating portion is reduced by making the radius of the first sphere accommodating portion having a cylindrical shape shorter than the sum of the radius of the sphere and the moving amount of the sphere. The minimum is necessary. In this way, by minimizing the diameter of the first ball housing portion, it is possible to minimize the area of the thin portion, so that the accuracy and strength of the parts of the frame or the lens holding frame can be reduced. It is possible to surely avoid the possibility of lowering.

  According to the present invention, it is possible to secure the amount of movement of the sphere and reduce the area of the thin portion.

It is a perspective view which shows one Embodiment of the lens drive device which concerns on this invention. It is a perspective view which shows the state which removed the cover part of the lens drive device of FIG. It is a disassembled perspective view which shows the lens drive device of FIG. It is a disassembled perspective view which shows the lens drive device of FIG. It is a perspective view which shows a movable frame and FPC. It is sectional drawing which shows a base part and a movable frame. It is sectional drawing which shows a movable frame and a lens holding frame. It is a perspective view which shows a lens holding frame. It is sectional drawing which shows a suction part. It is sectional drawing which shows the ball receiving recessed part of a movable frame, and the ball receiving recessed part of a lens holding frame.

  Hereinafter, a preferred embodiment of a lens driving device according to the present invention will be described in detail with reference to the drawings.

  The lens driving device shown in FIG. 1 is used in a digital camera, a mobile phone, a smartphone, or the like that performs image blur correction, and is a CCD [Charge Coupled Device] image sensor or a CMOS [Complementary Metal Oxide Semiconductor] image sensor that is an image pickup device. It is placed in front and used.

  As shown in FIGS. 1 to 3, the lens driving device 1 includes a rectangular parallelepiped lid body 2, a rectangular base portion 3 for closing the opening of the lid body 2, and focus adjustment drive for adjusting the focus. The flexible printed circuit board (hereinafter referred to as FPC) 5 for adjusting the focus for securing the electrical connection between the unit 4 and the external circuit, the image blur correction driving unit (driving unit) 6 and the external circuit An image blur correction FPC 7 for securing a general connection, and a substantially cylindrical lens barrel 8 that accommodates at least one lens R. In the following description, the direction perpendicular to the optical axis C of the lens R is defined as the X axis, and the direction perpendicular to the optical axis C direction and the X axis is defined as the Y axis.

  The lid 2 is a box-shaped member having a circular opening 2a centered on the optical axis C of the lens R, and the base 3 is a rectangular frame having a circular opening 3a centered on the optical axis C. Shaped member. The lens barrel 8 holds the lens R in a state where the lens R is exposed from the opening 2a and the opening 3a. The base 3 has a protrusion 3b that protrudes in the direction of the optical axis C from one side of the peripheral edge of the base 3, and a rectangular opening 3c is formed at the center of the protrusion 3b. . An H-shaped resin insulating plate 9 fixed to the front end 5a of the FPC 5 enters the opening 3c and closes the opening 3c.

  The FPC 7 has an extended portion 7 c extending outward from the lid body 2 and the base portion 3, and a bifurcated branch portion 7 a in a portion close to the lid body 2 and the base portion 3. As shown in FIG. 2, the bifurcated portion 7 a of the FPC 7 is fixed by being sandwiched between the locking projections 3 g of the base portion 3 inside the lid body 2. Further, the inner end of each of the branch portions 7a is fixed to a movable frame (frame body) 10, and the attracting force of the magnets 6a and 6b of the image blur correction drive unit 6 is amplified outside the tip portion 7b. The return yoke 11 is fixed. A Hall element 12 for magnetic detection is fixed to the tip 7b on the surface opposite to the surface on which the return yoke 11 is fixed (see FIG. 3).

  The movable frame 10 is supported by the base portion 3 so as to be movable in the direction of the optical axis C. As shown in FIGS. 3 to 5, the movable frame 10 includes a circular opening 10 a centered on the optical axis C, an oval coil loading portion 10 b formed at each corner on one side, and a movable frame 10. And three first ball receiving recesses 70 (see FIG. 5) into which the spheres 13 formed on the outer peripheral surface of the frame 10 enter. The lens barrel 8 is inserted into the opening 10a, and the coils 6c and 6d having an oval shape of the image blur correction driving unit 6 are fitted and fixed to the coil loading unit 10b. The movable frame 10 includes a magnet holding portion 10e that protrudes in the direction of the optical axis C on one side of the peripheral edge of the movable frame 10, and a magnet holding portion 10e that is a corner of the movable frame 10 with the optical axis C interposed therebetween. And two projecting portions 10f provided on the opposite side.

  The magnet holding portion 10e is formed in a crescent shape when viewed from the optical axis C direction, and both end portions 10g of the magnet holding portion 10e are notched in a semi-cylindrical shape and extend in the optical axis C direction. A ball receiving portion 10h is provided. Two spheres 15 enter one sphere receiving portion 10h, and one sphere 15 enters the other sphere receiving portion 10h, but two spheres 15 enter the other sphere receiving portion 10h. One sphere 15 may enter one of the ball receiving portions 10h.

  By the way, as shown in FIG. 4, three support portions 3 f formed at both ends of the protruding portion 3 b of the base portion 3 are formed with three ball receiving portions 3 d cut out in a semi-cylindrical shape, The ball receiving portion 3d is formed at a position corresponding to the ball receiving portion 10h. Further, as shown in FIG. 6, the base 3 is formed with a fitting recess 3 e for fitting the coil 4 a and the yoke 16 inside the protrusion 3 b of the base 3. The coil 4a of the focus adjustment drive unit 4 and the two yokes 16 are fitted in the recess 3e. The coils 4a are formed so as to form a trapezoidal upper bottom portion 4b and leg portions 4c when viewed from the optical axis C direction, and yokes 16 are respectively arranged outside the leg portions 4c formed at both ends of the upper bottom portion 4b. Is done.

  Further, as shown in FIG. 5, the outer periphery of the magnet holding portion 10e of the movable frame 10 has a flat magnet fixing portion 10i extending in the optical axis C direction and the Y axis direction, and a magnet fixing portion 10i. And a magnet fixing portion 10k formed at an inclination of 45 degrees on the opposite side of the magnet fixing portion 10j with respect to the magnet fixing portion 10i. Magnets 4d, 4e, and 4f of the focus adjustment drive unit 4 are fixed to the magnet fixing units 10i, 10j, and 10k, respectively. In the state where the movable frame 10 is held by the base portion 3, as shown in FIG. 6, the upper bottom portion 4b of the trapezoidal coil 4a faces the outside of the magnet 4d, and the coil 4a is placed outside the magnets 4e and 4f. Each leg part 4c has faced.

  Further, a Hall element 17 (see FIG. 3) as a magnetic field detection element is disposed inside the upper bottom portion 4b of the coil 4a, and the Hall element 17 is fixed to the front end portion 5a of the FPC 5. Two iron leads 18 extending from the upper bottom part 4b to the leg part 4c are arranged on both ends of the hall element 17, and the end part 18a of the lead 18 on the leg part 4c side is shown in FIG. Thus, it is electrically connected to the coil wire of the leg part 4c in the state extended outside the leg part 4c.

  By the cooperation of the coil 4a and the magnets 4d, 4e, and 4f, the movable frame 10 can move in the direction of the optical axis C with respect to the base unit 3 to adjust the focal point and change the focal length. It becomes. Further, since the yoke 16 is provided outside the leg portion 4c of the coil 4a, the yoke 16 fitted to the base portion 3 is attracted to the magnets 4d, 4e, 4f fixed to the movable frame 10, and the base portion. 3 is generated in a direction perpendicular to the optical axis C. Further, the base 3 and the movable frame 10 are sucked in a state where the sphere 15 is interposed between the ball receiving portion 10h (see FIG. 5) of the movable frame 10 and the ball receiving portion 3d (see FIG. 4) of the base portion 3. Therefore, the movable frame 10 is slidably supported on the base portion 3 via the sphere 15.

  Also, as shown in FIG. 4, the two protrusions 10f provided at the corners of the movable frame 10 have engaging protrusions 10m, and are opposed to each other across the optical axis C of the protrusions 10f. Engagement protrusions 10n are provided on the outer sides of both end portions 10g of the magnet holding portion 10e provided. Each engaging protrusion 10m is engaged with an engaging hole 21a of the pressing plate 21 for preventing the lens holding frame 20 from being lifted, and each engaging protrusion 10n is engaged with an engaging hole 21b of the pressing plate 21, respectively. Is done. Thereby, the movable frame 10 and the pressing plate 21 are fixed in a state where the lens holding frame 20 is sandwiched.

  As shown in FIG. 7, the lens holding frame 20 that holds the lens barrel 8 is supported so as to be movable in the direction perpendicular to the optical axis C with respect to the movable frame 10. The lens holding frame 20 has a circular opening 20a for fitting the lens barrel 8, a magnet fitting hole 20b for fixing the magnets 6a and 6b, and suction for sucking the lens holding frame 20 and the movable frame 10 together. A magnet fitting recess 20c for fixing the magnets 22a and 22b and a second ball receiving recess 80 (see FIG. 4) for receiving the sphere 13 are provided.

  Two magnet fitting holes 20b are provided at positions corresponding to the coil loading portion 10b (see FIG. 6) of the movable frame 10. The magnets 6a and 6b fitted in the magnet fitting hole 20b face the coils 6c and 6d fitted in the coil loading portion 10b in the optical axis C direction. The lens holding frame 20 can move in the direction orthogonal to the optical axis C with respect to the movable frame 10 and perform image blur correction by the cooperation of the coils 6c and 6d and the magnets 6a and 6b.

  As shown in FIG. 8, three magnet fitting recesses 20c are provided, and each of the magnet fitting recesses 20c is larger than two suction magnets 22a magnetized with four poles and the suction magnet 22a. A four-pole magnetized attracting magnet 22b is fitted. Each suction magnet 22 a is disposed at a position that is symmetric with respect to the optical axis C, and the suction magnet 22 b is disposed between the suction magnets 22 a in the circumferential direction of the lens holding frame 20.

  Further, as shown in FIG. 5, the movable frame 10 has three metal piece insertion portions 10d that are holes for inserting the fork-shaped iron pieces 14a and 14b, and each metal piece insertion portion. 10d is provided at a position corresponding to the magnet fitting recess 20c. In each metal piece insertion portion 10d, two iron pieces 14a and an iron piece 14b having a larger size than the iron piece 14a are inserted. Each iron piece 14 a is arranged at a position symmetrical to each other with respect to the optical axis C, and the iron piece 14 b is arranged between the iron pieces 14 a in the circumferential direction of the movable frame 10. The positions where the iron pieces 14 a and the iron pieces 14 b are arranged are positions away from the coils 6 c and 6 d of the image blur correction driving unit 6.

  The iron pieces 14a and 14b arranged in the movable frame 10 face the attracting magnets 22a and 22b arranged in the lens holding frame 20 in the optical axis C direction, respectively. As shown in FIG. 9, the iron piece 14 a inserted into the metal piece insertion portion 10 d of the movable frame 10 is divided into two forks so as to face the attraction magnet 22 a of the lens holding frame 20, and the optical axis C The movable magnet 10 and the lens holding frame 20 are attracted to each other by attracting the attracting magnet 22a and the iron piece 14a in the direction. As described above, the suction magnet 22a and the iron piece 14a constitute the suction portion 30a in which the lens holding frame 20 sucks the movable frame 10. Similarly, the iron piece 14b faces the attracting magnet 22b, and the iron piece 14b and the attracting magnet 22b constitute an attraction portion 30b (see FIG. 7). Further, since the magnetic attraction force of the attraction units 30 a and 30 b is stronger than the magnetic attraction force between the magnets 6 a and 6 b of the image blur correction drive unit 6 and the return yoke 11, the lens holding frame 20 is moved with respect to the movable frame 10. Thus, when the lens holding frame 20 is moved in the direction perpendicular to the optical axis C, the lens holding frame 20 can be reliably moved to a fixed position in the movable frame 10.

  Further, as shown in FIG. 3, a back yoke 25 having a crescent shape when viewed from the optical axis C direction is provided on the side of the holding plate 21 of the lens holding frame 20 in the optical axis C direction. The back yoke 25 is in close contact with the magnets 6a, 6b, 22a, 22b (see FIG. 7) of the lens holding frame 20 at the time of assembly.

  Next, the operation of the lens holding frame 20 will be described.

  If camera shake occurs when shooting with a device (for example, a camera) in which the lens driving device 1 is incorporated, the position of the optical axis C may change. In this case, a camera shake detection sensor such as a gyro sensor detects camera shake, and the control means (not shown) sends the drive signal of the lens holding frame 20 via the FPC 7 so that the position of the optical axis C is maintained at a predetermined position. Output to the coils 6c and 6d.

  Then, as shown in FIG. 7, the magnet 6a and the coil 6c generate a driving force F1 that works in a direction of a straight line connecting the magnet 6a, the coil 6c and the center O of the opening 20a (lens R), thereby holding the lens. The frame 20 is moved with respect to the movable frame 10 in the direction in which the driving force F1 acts. The magnet 6b and the coil 6d generate a driving force F2 that works in the direction of a straight line connecting the magnet 6b and the coil 6d and the center O, and move the lens holding frame 20 relative to the movable frame 10 in the direction in which the driving force F2 works. . By the movement of the lens holding frame 20 in the direction in which the driving forces F1 and F2 work, the position of the optical axis C is moved to a fixed position, and camera shake is corrected.

  Next, the second sphere receiving recess 80 of the lens holding frame 20 and the first sphere receiving recess 70 of the movable frame 10 will be described. As shown in FIG. 4, three second ball receiving recesses 80 are provided at positions corresponding to the first ball receiving recesses 70 (see FIG. 5) in the movable frame 10. In a state where the lens holding frame 20 is disposed on the movable frame 10, the second sphere receiving recess 80 and the first sphere receiving recess 70 form a space large enough to accommodate the sphere 13. By inserting the sphere 13 into the space formed by the second sphere receiving recess 80 and the first sphere receiving recess 70, the suction portions 30a and 30b support the lens holding frame 20 movably with these spheres 13. Let Further, when three spheres 13 are connected in a plane orthogonal to the optical axis C, an isosceles triangle is formed, and the lens holding frame 20 is supported by the movable frame 10 at three points. Therefore, the lens holding frame 20 can be moved with respect to the movable frame 10 in a stable state.

  As shown in FIG. 10, the ball receiving recess 80 of the lens holding frame 20 has a circular truncated conical shape with a circular bottom surface 82 and a side surface 81 that gradually increases in diameter toward the open side of the ball receiving recess 80. ing. The spherical receiving recess 70 of the movable frame 10 includes a cylindrical first sphere receiving portion 71 having a bottom surface 73 that supports the sphere 13 and extends in a direction orthogonal to the optical axis C, and a first sphere receiving portion. A stepped columnar shape having a cylindrical second sphere accommodating portion 72 having an enlarged diameter on the open side of 71. The first sphere accommodating portion 71 has a side surface 71 a rising from the bottom surface 73 in the optical axis C direction, and the second sphere accommodating portion 72 is an end of the first sphere accommodating portion 71 on the open side of the side surface 71 a. A bottom surface 72a extending in the direction perpendicular to the optical axis C and a side surface 72b rising from the bottom surface 72a in the optical axis C direction. In the sphere receiving recess 70, a stepped portion 75 is formed by the side surface 71 a of the first sphere housing portion 71 and the bottom surface 72 a of the second sphere housing portion 72.

Here, when the movement amount from the center of the first sphere receiving portion 71 of the sphere 13 interposed between the sphere receiving recess 80 of the lens holding frame 20 and the sphere receiving recess 70 of the movable frame 10 is “a”, The movement amount of the lens holding frame 20 with respect to the center O (see FIG. 7) is “2a”. When the lens holding frame 20 moves “2a” from the center O, the sphere 13 comes into contact with the upper end of the side surface 71a of the first sphere receiving portion 71, and the sphere 13 can be moved (movable range). Is “a” from the center of the first ball housing portion 71. As described above, in the sphere receiving recess 70, when the radius of the sphere 13 is “r”, the radius “X” of the sphere receiving portion 71 satisfies r <X <r + a. Further, the height of the side surface 71a in the first sphere housing portion 71, the radial width of the bottom surface 72a in the second sphere housing portion 72, and the height of the side surface 72b in the second sphere housing portion 72 are “r / 2 ”.

  When the lens holding frame 20 moves toward the center O after the lens holding frame 20 moves from the center O and the sphere 13 comes into contact with the upper end of the side surface 71a of the first ball housing portion 71, that is, the edge of the side surface 71a. The sphere 13 is separated from the side surface 71 a of the first sphere housing portion 71. Grease or the like is applied to the sphere receiving recess 70, but the sphere 13 contacts the edge of the side surface 71a, not the surface of the side surface 71a. Therefore, when the sphere 13 moves away from the side surface 71a, the sphere 13 is side surfaced by the grease or the like. Sticking to 71a is reduced.

  As described above, in the lens driving device 1, the movable frame 10 has the first sphere receiving recess 70 for accommodating the sphere 13. The spherical receiving recess 70 of the movable frame 10 includes a cylindrical first sphere accommodating portion 71, and a cylindrical second sphere accommodating portion 72 that is expanded on the open side of the first sphere accommodating portion 71. And has a stepped columnar shape including a first sphere accommodating portion 71 having a small diameter and a second sphere accommodating portion 72 having a large diameter.

  Thus, the sphere receiving recess 70 for accommodating the sphere 13 has a columnar shape having the stepped portion 75, and the first sphere having a diameter reduced with respect to the second sphere containing portion 72 is provided at the lower stage thereof. Since the accommodating portion 71 is provided, the region S1 of the thickness P1 (see FIG. 9) in the optical axis C direction in the movable frame 10 is set to be higher than the stepped portion 75 as compared with the case where the first spherical accommodating portion 71 is not provided. The thickness H can be reduced by this, and thereby the region S1 of the thickness P1 that tends to be thin can be reduced. Further, in the direction perpendicular to the optical axis C in the movable frame 10, the region S2 of the wall thickness P2 between the ball receiving recess 70 and the coil loading portion 10b or the metal piece insertion portion 10d may be reduced by the height H of the stepped portion 75. This can reduce the region S2 of the thickness P2 that tends to be thin. The lens driving device 1 used for a smartphone or the like is very small, and it is very important to increase the thickness as much as possible. Moreover, since the 2nd ball | bowl storage part 72 diameter-expanded with respect to the side surface 71a of the 1st ball | bowl storage part 71 is provided in the open | release side of the 1st ball | bowl storage part 71, 2nd ball | bowl accommodation The amount of movement of the sphere 13 in the direction perpendicular to the optical axis C can be increased as compared with the case where the portion 72 is not provided.

In the lens driving device 1, the radius of the sphere 13 is “r”, the radius of the first sphere receiving portion 71 of the sphere receiving recess 70 is “X”, and the center of the first sphere receiving portion 71 of the sphere 13 is from the center. When the movement amount is “a”, r <X <r + a is satisfied. As described above, the radius “X” of the first sphere accommodating portion 71 having a cylindrical shape is made shorter than the sum of the radius “r” of the sphere 13 and the movement amount “a” of the sphere 13. The areas S1 and S2 of the thicknesses P1 and P2 (see FIG. 9) of the movable frame 10 are also reduced by minimizing the diameter of the first ball accommodating part 71 and minimizing the diameter of the first spherically accommodating part 71. It can be minimized. Therefore, it is possible to avoid a possibility that the component accuracy and strength of the movable frame 10 on which the sphere 13 is disposed are lowered by forming the sphere receiving recess 70.

  Furthermore, in the sphere receiving recess 70, if the height of the side surface 71a with respect to the bottom surface 73 is too low, the sphere 13 rides on the sphere accommodating portion 71, and if the height of the side surface 71a with respect to the bottom surface 73 is too high, The amount of movement will be small. However, in the sphere receiving recess 70, the height of the side surface 71a of the first sphere accommodating portion 71 is “r / 2”, so that the sphere 13 is unlikely to ride on the sphere accommodating portion 71 and the sphere 13 The amount of movement can be secured.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  In the above embodiment, the ball receiving recess 70 of the movable frame 10 has a stepped columnar shape including the small diameter ball receiving portion 71 and the large diameter ball receiving portion 72, but the ball receiving recess 80 of the lens holding frame 20. May be a stepped cylinder. Further, the sphere receiving recesses 70 and 80 that do not have a stepped column shape may be flat instead of the recesses.

  Further, the movement amount of the lens holding frame 20 may exceed “2a”. In this case, the lens holding frame 20 moves even after the sphere 13 comes into contact with the side surface 71a. However, since the sphere 13 is in contact with the upper end of the side surface 71a, that is, the edge, the sphere 13 and the side surface 71a are moved. The friction is reduced. When the lens holding frame 20 has a movement amount exceeding “2a”, only one of the ball receiving recesses 70 and 80 satisfies r <X <r + a for the radius X of the ball receiving portion. .

  In addition, the height value of the side surface 71 a in the first sphere housing portion 71, the radial width value of the bottom surface 72 a in the second sphere housing portion 72, and the height of the side surface 72 b in the second sphere housing portion 72. Although the value of “r / 2” is used, the above values can be appropriately changed.

  The suction magnet 22a and the iron piece 14a constitute the suction part 30a that attracts the lens holding frame 20 to the movable frame 10, but the structure of the suction part is not limited to the above, and the lens holding frame is movable by a spring, for example The frame may be sucked.

  Furthermore, although the lens holding frame 20 is supported at three points within the movable frame 10 by the three spheres 13, the number of spheres is not limited to three.

DESCRIPTION OF SYMBOLS 1 ... Lens drive device, 6 ... Image blur correction drive part (drive part), 10 ... Movable frame (frame body), 13 ... Sphere, 20 ... Lens holding frame, C ... Optical axis, 70 ... 1st sphere receiving recessed part (Recessed part), 71... First sphere accommodating part, 71a... Side surface, 72... Second sphere accommodating part, 73.

Claims (4)

A lens driving device having a lens holding frame that holds a lens and is movably supported in a plane perpendicular to the optical axis in the frame,
A drive unit for moving the lens holding frame in a plane perpendicular to the optical axis;
A first recess provided in either the frame or the lens holding frame;
A second recess provided in either the frame body or the lens holding frame;
A sphere disposed in a space formed by the first recess and the second recess and supporting the lens holding frame with respect to the frame in the optical axis direction,
In the space, the first concave portion is formed by a columnar first sphere housing portion formed by a bottom surface supporting the sphere and a side surface rising from the bottom surface, and an open side of the first sphere housing portion. A lens driving device comprising: a cylindrical second sphere housing portion having a diameter larger than that of the first sphere housing portion . When the radius of the sphere is “r”, the radius of the first sphere accommodating portion is “X”, and the amount of movement of the sphere from the center of the first sphere accommodating portion is “a”,
r <X <r + a
The lens driving device according to claim 1 , wherein: 3. The lens driving device according to claim 1, wherein the first recess further includes a step portion formed by a side surface of the first sphere housing portion and a bottom surface of the second sphere housing portion. . It said second recess has a circular base, the and a gradually enlarged by the side toward the open side of the second recess, the lens driving device according to any one of claims 1 to 3.

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