JP4871679B2 - Image blur correction device, lens barrel, and imaging device - Google Patents

Description

  The present invention relates to an image blur correction apparatus that corrects image blur, a lens barrel including the image blur correction apparatus, and an imaging apparatus.

  In modern cameras, tasks important for shooting such as determining exposure and focusing are automated. Therefore, even a person who is not familiar with the camera operation has a very low possibility of shooting failure, but it is difficult to automatically prevent shooting failure due to camera shake. Therefore, recently, a camera that prevents photographing failure due to camera shake has been studied. In particular, the development and research of a camera that can prevent a shooting failure due to a camera shake of a photographer is underway.

  The above-mentioned camera shake is a vibration of usually 1 Hz to 12 Hz as a frequency. In order to be able to take a picture free from image blur even if such camera shake occurs at the shutter release time, first, camera vibration due to the camera shake is detected. Then, the correction lens must be displaced according to the detected value. Therefore, in order to enable photography that does not cause image blur even when camera shake occurs, it is necessary to accurately detect camera vibration and correct optical axis changes due to camera shake.

  In principle, the camera shake prevention includes a vibration sensor that detects angular acceleration, angular velocity, and the like, and a camera shake detection system that outputs an angular displacement by electrically or mechanically integrating a signal from the sensor. To do. And it can carry out by mounting the correction | amendment optical system which decenters an optical axis, and its drive mechanism in a camera. Accordingly, various mechanisms for holding the correction optical system in the lens barrel so as to be decentered have been proposed.

  In recent years, a thin camera having a high portability has been disclosed using an optical system called a bending optical system whose optical axis is bent 90 degrees with a prism or mirror in the middle. Therefore, the lens barrel inside the thin camera has a thin shape.

  Japanese Patent Application Laid-Open No. H10-228688 discloses a camera that incorporates a correction optical system that is moved so as to prevent the occurrence of image blur on the imaging plane when camera shake occurs. In this camera, the correction optical system has a structure that is supported in a cantilever manner by at least three flexible support bars that extend in parallel to the photographing optical axis and have the same length.

In addition, the image sensor includes an image sensor that converts light into an electrical signal, a photographing lens member that focuses subject light on the image sensor, and a substrate on which the image sensor is mounted. Patent Document 2 discloses a structure in which the photographing lens member is supported eccentrically by four flexible members having one end fixed to the photographing lens member and the other end fixed to the substrate. ing.
Japanese Patent Laid-Open No. 2-66536 JP 2002-207148 A

  Recently, many proposals have been made regarding an apparatus for correcting image blur in a camera. In the image blur correction apparatus disclosed in these proposals, the structure of the correction optical system is complicated, and is not particularly suitable for a compact camera or the like. That is, the correction optical system must be moved in a direction perpendicular to the optical axis. For this reason, since it is necessary to support the holding frame of the correction optical system in a slidable manner, the structure is inevitably complicated. Moreover, the drive mechanism and drive control means for precisely moving the holding frame in the direction perpendicular to the optical axis are generally complicated and expensive. Therefore, the known image blur correction device is not suitable for a compact camera.

  In view of this point, in Patent Document 1 described above, the correction optical system is supported in a cantilever manner by at least three flexible support rods having the same length and extending parallel to the imaging optical axis. Yes.

  Similarly, in Patent Document 2, a holding unit for holding a photographing lens is supported by four wires so as to be displaceable in the planes X and Y perpendicular to the optical axis. Four wires having the same shape are arranged symmetrically around the optical axis. The magnet and the coil are arranged so that the driving force generated by the magnet and the coil that drives the photographing lens in the X direction passes through the optical axis.

  The plurality of wire members that support the correction optical system are arranged at equal division angles about the optical axis center and at equal distances in the radial direction. The support with, for example, three wires in Patent Document 1 is equally arranged around the optical axis at 120 degrees. In any conventional example, the driving source is arranged so that the driving force vector that decenters the correction optical system passes through the optical axis. For this reason, the shape of the member that supports the correction optical system is a regular equilateral triangle or square around the optical axis.

  In order to incorporate an image blur correction apparatus into a camera using a bending optical system that is desired to be thin, a member that supports the correction optical system is also suitably rectangular. However, in the above-described conventional example, the shape is a regular triangle or a square, and there is a possibility that the thinning of the lens barrel and the camera may be hindered.

  Therefore, it is assumed that these arrangements are easily changed in order to make the entire camera small or thin. Then, the position of the driving force vector generated at the driving source and the restoring spring force vector to be returned to the original position by the wire or the spring are shifted to generate a rotational moment. For this reason, the image blur correction optical system may have unnecessary translational motion (movement around the optical axis) as well as necessary translational motion (motion in a plane perpendicular to the optical axis), which may reduce the accuracy of image blur correction. there were.

(Object of invention)
An object of the present invention is to provide an image blur correction device, a lens barrel, and an imaging device that are thin or small and have high control position accuracy of a correction optical system in a plane perpendicular to the optical axis.

To achieve the above object, the present invention provides a correction optical system for correcting image blur, a holding member that holds the correction optical system, and a support member that is movable in a direction perpendicular to the optical axis. supporting means for a first driving means for moving the holding member in a first direction which is perpendicular to the optical axis direction, the holding member a direction perpendicular to the optical axis, said first direction And an image blur correction apparatus having second driving means for moving in different second directions, wherein the supporting means supports the holding member by a plurality of supporting members, and the plurality of supporting members in the holding member. The correction optical system is arranged such that the second drive means is arranged at the center of a plurality of positions to which the second drive means is attached, and the second drive means is located between the correction optical system and the first drive means, The first driving means and the second driving means are connected to the first driving means. It is an image stabilizer is arranged on a straight line in the direction.

  Similarly, in order to achieve the above object, the present invention provides a lens barrel including the image blur correction device of the present invention.

Similarly, in order to achieve the above object, the present invention is an imaging apparatus including the image blur correction apparatus of the present invention.

  According to the present invention, it is possible to provide an image blur correction device, a lens barrel, or an imaging device that is thin or small and has high control position accuracy of the correction optical system in a plane perpendicular to the optical axis.

  The best mode for carrying out the present invention is as shown in Examples 1 and 2 below.

  A lens barrel according to a first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a front view and a side view of a lens barrel. FIG. 2 is a view in which the cover plate 1470 and the cover box 1480 are removed from the state of FIG. 1 so that the inside of the lens barrel can be seen. 3 is a front perspective view showing a wide angle state, FIG. 4 is a front perspective view showing a standard state, and FIG. 5 is a front perspective view showing a telephoto state. 6 is a front view and a side view showing the fixed frame omitted, and FIG. 7 is a front perspective view showing the fixed frame omitted. FIG. 8 is a perspective view showing the shutter unit, the fifth group frame, and the image blur correction device, and FIG. 9 is a perspective view showing the fifth group frame and the image blur correction device. FIG. 10 is a perspective view showing an image blur correction device, and FIG. 11 is an upper perspective view showing a part of the image blur correction device in an exploded manner. FIG. 12 is a lower perspective view showing a part of the image blur correction device in an exploded manner, and FIG. 13 is an upper perspective view showing a part of the image blur correction device in an exploded manner. 14 is an exploded perspective view showing a part of the image blur correction device, FIG. 15 is an exploded perspective view showing the image blur correction device, and FIG. 16 is a lower perspective view showing the image blur correction device in an exploded manner. It is. FIG. 17 is a perspective view in which a part of the image blur correction apparatus is omitted, and FIG. 18 is a top view in which a part of the image blur correction apparatus is omitted. FIG. 19 is a top view showing a part of the image blur correction apparatus with a part omitted. FIG. 20 is a top view showing a state moved in the + Y direction in the image blur correction apparatus, and FIG. 21 is a top view showing a state moved in the −Y direction in the image blur correction apparatus. FIG. 22 is a top view showing a state where the image blur correction apparatus is moved in the + X direction, and FIG. 23 is a top view showing a state where the image blur correction apparatus is moved in the −X direction. FIG. 24 is a top view showing the image blur correction apparatus with a part thereof omitted.

  First, the structure of the optical system of this lens barrel will be described. The imaging optical system of this lens barrel has a 6-group configuration, and is a bending optical system in which a prism 1411 that bends the optical axis at 90 degrees is disposed between the first group and the second group. In the side view of FIG. 2 (b), there is a subject to be photographed on the left side of the paper, and the luminous flux from the subject passes through the first lens group included in the first group frame 1410, and at the rear of the first lens group. The bent prism 1411 is bent downward in the drawing. Thereafter, as shown in FIGS. 3, 9, 11, and the like, the luminous flux is a second lens group included in the second group frame 1420, a third lens group 1120 included in the fixed frame 1400, and a lens holding member 1030. Passes through the fourth lens group 1110 included in the lens. Furthermore, as shown in FIG. 5, the fifth lens group 1105 included in the fifth group frame 1440 and the sixth lens group 1100 included in the base support member 1010 (see FIG. 13) are sequentially passed. A subject image is formed on an image sensor 1460 (see FIG. 6) held by the image sensor holding plate 1450.

  As shown in FIG. 6A and the like, the second group frame 1420 including the second lens group can be advanced and retracted in the optical axis direction by a dedicated stepping motor 1422. The initial position in the optical axis direction is detected when a part of the second group frame 1420 passes through a second group PI (photo interrupter) 1421. The subsequent displacement is obtained by integrating the number of control pulses of the stepping motor 1422. In this way, the position of the second group frame 1420 can be detected.

  Similarly, the fifth group frame 1440 including the fifth lens group 1105 can be advanced and retracted in the optical axis direction by a dedicated stepping motor 1442 as shown in FIG. 6B and the like. The initial position in the optical axis direction is detected when a part of the fifth group frame 1440 passes through the fifth group PI (photo interrupter) 1441. The subsequent displacement amount is obtained by integrating the number of control pulses of the stepping motor 1442. In this way, the position of the fifth group frame 1440 can be detected.

  During zooming for changing the shooting magnification, the arrangement changes from FIG. 3 to FIG. 4 and FIG. Specifically, the second group frame 1420 containing the second lens group is moved to the image sensor holding plate 1450 side on the lower side of the drawing in each figure. In addition, the fifth group frame 1440 including the fifth lens group 1105 is moved to the first group frame 1410 side above the paper surface. This makes it possible to enlarge the subject image from the wide-angle state to the telephoto state. Therefore, if the second group frame 1420 and the fifth group frame 1440 are moved in the opposite directions, it is possible to zoom from the telephoto state to the wide angle state.

  At the time of focusing to focus on a subject at a certain focal length, that is, in a certain zoom state, the fifth group frame 1440 including the fifth lens group 1105 is driven by the stepping motor 1442, and the first group frame 1410 further above the paper surface. Move to the side. This makes it possible to focus from infinity to a close range. The in-focus determination is performed by contrast AF (autofocus) in which the lens group is advanced and retracted so that the contrast of the subject image captured by the image sensor 1460 is maximized.

  As shown in FIG. 6 and the like, the shutter unit 1430 is fixed to the fixed frame 1400 on the imaging element 1460 side below the second group frame 1420. The shutter unit 1430 appropriately controls the amount of light applied to the image sensor 1460 by opening and closing the shutter blades during shooting.

  In FIG. 15, the assembly order on the magnet side of the image blur correction device will be described. FIG. 15 is an upper exploded perspective view in which components constituting the image blur correction apparatus are disassembled one by one in the optical axis direction in the vertical direction of the paper surface.

  The base support member 1010 is provided with fixing portions 1010a, 1010b, 1010c, and 1010d that fix the wires at the four corners. Then, the lower ends of the four wires 1020, the wires 1021, the wires 1022, and the wires 1023 are bonded and fixed to the central hole portions. The upper ends of the four wires pass through wire fixing portions 1030a, 1030b, 1030c, and 1030d disposed at the four corners of the lens holding member 1030, and are bonded and fixed.

  As for the wire diameter in the first embodiment, the wire 1020 and the wire 1021 have a diameter of 0.29 mm, and the wire 1022 and the wire 1023 also have a diameter of 0.29 mm. The four materials are stainless steel, and the surface is painted black to reduce surface reflection.

  The magnet 1050 is two-pole magnetized such that the surface of a part 1050a is N-pole, the back side is S-pole, the remaining side 1050b is S-pole and the back side is N-pole. Similarly, the magnet 1051 is magnetized in two poles such that the surface of a part 1051a is N-pole, the back surface is S-pole, the remaining side 1051b is S-pole and the back side is N-pole. A rectangular iron-based material yoke 1040 and a magnet 1050 are fitted into a square hole 1030f in the center of the lens holding member 1030, and are fixedly bonded. The magnet at this time is fitted so that the surface N pole side of a part 1050a faces in the second direction (Y direction).

  In addition, a rectangular iron-based material yoke 1041 and a magnet 1051 are fitted into a rectangular hole 1030g at one end in the longitudinal direction (−X direction) of the lens holding member 1030, and are fixedly bonded. The magnet 1051 at this time is fitted so that the surface S pole side of the remaining side 1051b is directed in the first direction (X direction) where the optical axis of the fourth lens group 1110 is located. The fourth lens group 1110 is fixed to the lens fixing portion 1030e at the other end in the longitudinal direction (+ X direction) of the lens holding member 1030.

  Next, referring to FIG. 16, the assembly order on the coil side of the image blur correction apparatus will be described. In FIG. 16, the upper side of the fixed frame 1400 is omitted.

  Coils 1060 and 1061 are made of a nichrome wire having a wire diameter of 0.08 mm wound in an oval several hundred times and hardened with an adhesive, and oval holes 1060a and 1061a are opened in the center. Both ends 1060b and 1060c, 1061b and 1061c of the nichrome wire are connected to a circuit (not shown), and the energization direction and amount are controlled.

  A third lens group 1120 is fixed to the lens receiving portion 1400 a of the fixed frame 1400 using a lens fixing member 1121. Reference numeral 1122 denotes a mask for regulating the luminous flux. One side of the fixed frame 1400 adjacent to the lens receiving portion 1400a in the longitudinal direction has an oval coil receiving hole 1400b. Then, the back yoke 1070 is bonded and fixed to the guide protrusions 1400c and 1400d inside the hole while passing the holes 1070a and 1070b of the back yoke 1070. Next, the coil 1060 is fitted into the oval coil receiving hole 1400b so that both ends of the elongated hole 1060a at the center of the coil 1060 are fitted into the guide protrusions 1400c and 1400d, and are fixed by adhesion. Similarly, an oval coil receiving hole 1400e is provided at a portion adjacent to the coil 1060. Then, the back yoke 1071 is bonded and fixed to the guide protrusions 1400f and 1400g inside the hole while passing the holes 1071a and 1071b of the back yoke 1071. Next, the coil 1061 is fitted into the oval coil receiving hole 1400e so that both ends of the elongated hole 1061a at the center of the coil 1061 are fitted into the guide protrusions 1400f and 1400g, and are bonded and fixed.

  By the above assembly, as shown in FIG. 11, the lens holding member 1030 side unit having the fourth lens group 1110 and the magnet as the correction optical system and the unit on the fixed frame 1400 side having the coil are completed.

  The unit on the fixed frame 1400 side having the coil is fixed to the fixed frame 1400 on the image sensor 1460 side of the shutter unit 1430 as shown in FIG. The lens holding member 1030 side unit is incorporated in the lens barrel by fixing the base support member 1010 to a fixed frame 1405 in the vicinity of the image sensor 1460.

  Next, the behavior of the lens holding member 1030 due to energization of the coils 1060 and 1061 will be described with reference to FIGS.

  FIG. 17 is a perspective view showing the main part of the image blur correction apparatus. FIG. 19 is a view looking down from above the optical axis, omitting a part of the image blur correcting device. Here, for explanation, the coil 1060 and the coil 1061 are floating in the air.

  A lens holding member 1030 that can be displaced in a plane perpendicular to the optical axis, a fourth lens group 1110, magnets 1050 and 1051, and wires 1020, 1021, 1022, and 1023 fixed thereto are shown. Further, only the coil 1060 and the coil 1061 fixed to the fixed frame 1400 are also shown. Here, for ease of explanation, the center line is shown with the optical axis center, the right direction on the drawing in FIG. 18 as the first direction (X direction), and the upward direction on the drawing as the second direction (Y direction). is doing.

  Assume that 150 mA of current is applied to terminals 1060b to 1060c of the coil 1060. Then, based on the electromagnetic principle, as shown in FIG. 20, a driving force Fy in the + Y direction is generated on the magnet 1050, and the fourth lens group 1110 held by the lens holding member 1030 has δY = 0 in the + Y direction. Displace by 2 mm. At this time, the tip of the wire 1020 is bent by δY = 0.2 mm, and a reaction force Sa is generated to return the lens holding member 1030 in the −Y direction. Similarly, each wire generates wire reaction forces Sb, Sc and Sd. The wire diameter of the wire 1020 and the wire 1021 is φ0.29 mm, and the wire diameter of the wire 1222 and the wire 1223 is also φ0.29 mm. Since the displacement at each wire tip is the same, the vector of the total reaction force (total wire reaction force) Sy of the wire reaction forces Sa, Sb, Sc, Sd is the driving force at the center of the lens holding member 1030. Passes near the generation point of Fy.

  In this manner, since the generation vector of the total wire reaction force Sy passes almost through the generation point of the driving force Fy, the generation of the rotational moment around the optical axis is small, and the lens holding member 1030 hardly rotates in the + Y direction. 0.2 mm parallel movement is possible. Therefore, the fourth lens group 1110 can also be translated by 0.2 mm in the + Y direction with little rotational movement.

  FIG. 21 is a displacement diagram when a current of 150 mA is passed through the coil 1060 in the direction opposite to that in FIG. The lens holding member 1030 is displaced by δY = 0.2 mm in the −Y direction by the generated electromagnetic force Fy in the −Y direction. At this time, the total wire reaction force Sy vector passes near the generation point of the electromagnetic force Fy. Therefore, the generation of a rotational moment around the optical axis is small, and the fourth lens group 1110 can move in parallel in the −Y direction by 0.2 mm with little rotational movement.

  FIG. 22 is a displacement diagram when the coil 1060 is not energized and only the coil 1061 is energized with 150 mA. The lens holding member 1030 is displaced by δX = 0.2 mm in the + X direction by the generated electromagnetic force Fx in the + X direction. At this time, the wire reaction force Sa, the wire reaction force Sc, the wire reaction force Sb, and the wire reaction force Sd are positioned at the position where the electromagnetic force Fx is generated in the vertical direction. Therefore, the vector of the total wire reaction force Sx passes through the generation point of the electromagnetic force Fx. For this reason, almost no rotational moment occurs around the optical axis, and the fourth lens group 1110 can be translated by 0.2 mm in the + X direction.

  FIG. 23 is a displacement diagram when a current of 150 mA is passed through the coil 1061 in the direction opposite to that in FIG. The lens holding member 1030 is displaced by δX = 0.2 mm in the −X direction by the generated electromagnetic force Fx in the −X direction. At this time, the vector of the total wire reaction force Sx passes through the generation point of the electromagnetic force Fx. Therefore, almost no rotational moment around the optical axis is generated, and the fourth lens group 1110 can be translated by 0.2 mm in the --X direction.

  In this way, the total wire reaction force vector is applied to the generation point of the electromagnetic force Fy in the second direction (Y direction) generated in the coil 1060 and also in the first direction (X direction) generated in the coil 1061. It almost intersects with the generation point of the force Fx. In other words, it can be said that the generation point of the total wire reaction force is located almost at the intersection of the electromagnetic force Fy generated by the coil 1060 and the electromagnetic force Fx generated by the coil 1061.

  Actually, the fourth lens group 1110 needs to be displaced by a certain amount simultaneously in the first direction (X direction) and the second direction (Y direction) for image blur correction. However, this can be achieved by controlling the energization amount and energization direction of the coil 1060 and the coil 1061. Also at this time, it can be easily estimated from the combination of FIGS. 20 to 23 that the generation point of the total wire reaction force Sx or Sy and the generation point of the electromagnetic force Fx or Fy substantially coincide. Therefore, the lens holding member 1030 can move in a translational manner with little rotation even at an arbitrary displacement. Therefore, the fourth lens group 1110 can also be translated in the X and Y planes with little rotational movement.

  As described above, the magnet 1051 that drives in the first direction (X direction) and the second direction (Y direction) drive in a straight line across the fourth lens group 1110 that is an image blur correction optical system. The magnets 1050 to be arranged can be arranged. Therefore, a thin image blur correction apparatus can be configured in the second direction (Y direction).

  In FIG. 9, in this lens barrel, four wires 1020, 1021, 1022, and 1023 of the image blur correction device are disposed in a vacant space outside the fifth group frame 1440 that is driven to the optical axis by zooming and focusing. Has been placed. Therefore, it is possible to support the fourth lens group 1110 that is an image blur correction optical system movably in a plane perpendicular to the optical axis without enlarging the lens barrel.

  A second drive source (consisting of a coil 1060, a magnet 1050, etc.) is disposed in the center of the lens holding member 1030. Therefore, when driving in the second direction (Y direction), the driving force and the resistance force generated by friction and elasticity are balanced, and the lens holding member 1030 does not cause a rotational motion. Therefore, it is possible to drive with high accuracy in the second direction.

  Further, it has support means (base support member 1010) including an elastic member (wires 1020 to 1023) having a force (restoring force) for returning the moved lens holding member 1030 to the center of the optical axis. Therefore, the movement control of the lens holding member 1030 can be performed by the balance between the restoring force and the driving force. Therefore, the detection means for detecting the position of the lens holding member 1030 can be omitted, and the image blur correction device can be downsized.

  The total restoring force point generated by the elastic members provided at the four corners is substantially at the center of the lens holding member 1030, and the second drive source is disposed at the center. Therefore, when driving in the second direction (Y direction), the total restoring force point and the position of the second drive source substantially coincide. In driving in the first direction (X direction), the first driving source (consisting of the coil 1061, the magnet 1051, and the like) is disposed at a position shifted in the first direction with respect to the center of the lens holding member 1030. The Therefore, the driving force vector of the first driving source passes through the total restoring force point. The total restoring force point is a restoring force point when the restoring forces generated in each of the plurality of elastic members are combined and the center of the total restoring force is regarded as the generating point of the restoring force of one elastic member.

  As described above, in the driving in the second direction, the total restoring force point coincides with the driving force generation point of the second driving source. In the driving in the first direction, the driving force vector of the first driving source passes through the total restoring force point. Therefore, the lens holding member can be translated in a plane orthogonal to the optical axis without causing rotational movement, and image blur correction can be performed without deteriorating optical performance. Also in the image blur correction device in which the bending optical system is disposed in the lens barrel, the second drive source is disposed at the center of the lens holding member, the correction optical system is disposed at one end of the adjacent lens, and the first drive is disposed at the other end. The source is arranged. For this reason, the driving force generated by the second driving source and the center of gravity of the lens holding member substantially coincide. In addition, the driving force generated by the first driving source almost passes through the center of gravity. Therefore, the influence of gravity due to the posture of the lens barrel is reduced.

  For the above reasons, the lens holding member can be translated in a plane perpendicular to the optical axis without causing rotation, and image blur correction can be performed without degrading the optical performance. In addition, since the correction optical system, the first drive source, and the second drive source are arranged in a straight line, the lens holding member can be made thin.

  In addition, since the first direction and the second direction form 90 degrees, the moving direction controlled and set in the X and Y planes can be easily realized by combining the first direction and the second direction. Therefore, it is possible to perform a small and highly accurate image blur correction.

  Further, by using a metal having a high Young's modulus, the elastic member can be made thin, and the image blur correction device can be miniaturized.

  In addition, since the amount of reflection of unnecessary light rays on the elastic member surface can be reduced, the flexible member can be brought closer to the optical path, and the image blur correction apparatus can be miniaturized.

  In addition, since the lens barrel incorporates an image blur correction device, it is possible to record a high-quality image with image blur correction.

  FIG. 25 is a top view of the image blur correction apparatus according to the second embodiment of the present invention. FIG. 26 is a cross-sectional view taken along the line AA in FIG. 25 and shows the height relationship in the optical axis direction. Here, only differences from the first embodiment will be described.

  This shows a main part of an image blur correction device that reduces the image blur by driving and controlling the correction optical system 2110 in the X and Y planes, and is incorporated in the photographing optical system.

  The lens holding member 2030 has a disk shape, and a magnet 2050 for driving the lens holding member 2030 in the Y direction (up and down direction on the paper surface) is fixed at the center thereof. A magnet 2051 for driving the lens holding member 2030 in the X direction (left and right direction in the drawing) is disposed in the −X direction (left side in the drawing) of the magnet 2050. The correction optical system 2110 is fixed in the + X direction (right side of the drawing) of the magnet 2050.

  Three tension coil springs 2020, 2021, 2022 are arranged at equal angles on the outer periphery of the lens holding member 2030, and one end is fixed to the fixed frame 2400. Therefore, when the lens holding member 2030 is displaced in the X and Y directions from the current position, the lens holding member 2030 attempts to return to the original current position by the total force of the tension coil spring.

  The coil 2060 that generates an electromagnetic force that drives the lens holding member 2030 in the Y direction is held by a part (not shown) of the fixed frame 2400 above the magnet 2050. A coil 2061 that generates an electromagnetic force for driving the lens holding member 2030 in the X direction is held by a part (not shown) of the fixed frame 2400 above the magnet 2051.

  The driving method of X and Y is the same as that of the first embodiment, the function of the magnet 1050 of the first embodiment is replaced with the magnet 2050 of the second embodiment, and the function of the magnet 1051 of the first embodiment is the same as that of the second embodiment. The magnet 2051 is replaced. Further, the function of the coil 1060 of the first embodiment is replaced with the coil 2060 of the second embodiment, and the function of the coil 1061 of the first embodiment is replaced with the coil 2061 of the second embodiment.

  An X-direction position sensor 2510 that detects the amount of movement of the lens holding member 2030 in the X direction is disposed in the + Y direction (position on the paper surface) of the magnet 2050. In addition, a Y-direction position sensor 2520 that detects the amount of movement of the lens holding member 2030 in the Y direction is disposed in the −Y direction (the lower position in the drawing) of the magnet 2050.

  In the second embodiment, in the circular lens holding member 2030, the second driving source is arranged at the center of the lens holding member 2030, and the total restoring force point is obtained by the elastic members (tensile coil springs 2020 to 2022) arranged on the circumferential edge of the circle. Located at the center of the lens holding member 2030. For this reason, the second driving force and the total restoring force point coincide with each other, and the lens holding member 2030 can be translated in a plane perpendicular to the optical axis without causing rotational movement, and image blur correction is performed without degrading optical performance. Is possible.

  In addition, since the total restoring force and the center of gravity are almost the same, the lens frame does not rotate even if the posture of the image blur correction device changes with respect to the direction of gravity, and the surface is normal to the optical axis. Translational movement is possible, and image blur correction can be performed without degrading the optical performance.

  Further, in the circular lens holding member 2030, position sensors 2520 and 2521 are arranged at positions where the lens holding member 2030 is vacant. Therefore, by measuring the displacement of the lens holding member 2030 without increasing the lens holding member 2030, it is possible to perform image blur correction with high accuracy.

It is the front view and side view which show the lens barrel which concerns on Example 1 of this invention. It is the figure which removed the cover of the upper surface from the state of FIG. It is a front perspective view which shows a wide angle state in the lens barrel which concerns on Example 1 of this invention. It is a front perspective view which shows a standard state in the lens barrel which concerns on Example 1 of this invention. It is a front perspective view which shows a telephoto state in the lens barrel which concerns on Example 1 of this invention. It is the front view and side view which abbreviate | omit and show a fixed frame in the lens-barrel which concerns on Example 1 of this invention. It is a front perspective view which abbreviate | omits and shows a fixing frame in the lens-barrel which concerns on Example 1 of this invention. FIG. 6 is a perspective view illustrating a shutter unit, a fifth group frame, and an image blur correction device in the lens barrel according to Embodiment 1 of the present invention. FIG. 6 is a perspective view showing a fifth group frame and an image blur correction device in the lens barrel according to Embodiment 1 of the present invention. 1 is a perspective view illustrating an image blur correction apparatus according to Embodiment 1 of the present invention. 1 is an exploded perspective view showing a part of an image blur correction apparatus according to Embodiment 1 of the present invention. It is a lower perspective view which decomposes | disassembles and shows a part of image blur correction apparatus which concerns on Example 1 of this invention. 1 is an exploded perspective view showing a part of an image blur correction apparatus according to Embodiment 1 of the present invention. It is a lower perspective view which decomposes | disassembles and shows a part of image blur correction apparatus which concerns on Example 1 of this invention. 1 is an exploded top perspective view showing an image blur correction apparatus according to Embodiment 1 of the present invention. FIG. 1 is an exploded perspective view of an image blur correction apparatus according to a first embodiment of the present invention. 1 is a perspective view showing a part of an image blur correction apparatus according to Embodiment 1 of the present invention with a part thereof omitted. FIG. It is a top view which abbreviate | omits and shows a part of image blur correction apparatus which concerns on Example 1 of this invention. It is a top view which abbreviate | omits and shows a part of image blur correction apparatus which concerns on Example 1 of this invention. FIG. 3 is a top view illustrating a state in which the image blur correction apparatus according to Embodiment 1 of the present invention has moved in the plus Y direction. FIG. 6 is a top view illustrating a state in which the image blur correction apparatus according to Embodiment 1 of the present invention has moved in the minus Y direction. FIG. 6 is a top view illustrating a state in which the image blur correction apparatus according to Embodiment 1 of the present invention has moved in the plus X direction. FIG. 6 is a top view illustrating a state in which the image blur correction apparatus according to Embodiment 1 of the present invention has moved in the minus X direction. It is a top view which abbreviate | omits and shows a part of image blur correction apparatus which concerns on Example 1 of this invention. 1 is a top view showing an image blur correction apparatus according to Embodiment 1 of the present invention. FIG. It is AA sectional drawing of FIG.

Explanation of symbols

1010, 2010 Base support member 1020 Wire (flexible member)
1021 Wire (flexible member)
1022 Wire (flexible member)
1023 Wire (flexible member)
1030, 2030 Lens holding member 1040 Yoke 1041 Yoke 1050, 2050 Magnet 1051, 2051 Magnet 1060, 2060 Coil 1061, 2061 Coil 1070 Back yoke 1071 Back yoke 1100 6th lens group 1105 5th lens group 1110 4th lens group 1120 3rd Lens group 1121 Lens fixing member 1122 Mask 1400 Fixed frame 1405 Fixed frame 1411 Prism 1410 First group frame 1420 Second group frame 1421 Second group PI (photo interrupter)
1422 Stepping motor 1430 Shutter unit 1440 5th group frame 1441 5th group PI (photo interrupter)
1442 Stepping motor 1450 Image sensor holding plate 1460 Image sensor 1470 Cover plate 1480 Cover box 2110 Correction optical system 2020 Tension coil spring 2021 Tension coil spring 2022 Tension coil spring 2400 Fixed frame

Claims (11)

A correction optical system for correcting image blur;
A holding member for holding the correction optical system;
Support means for supporting the holding member so as to be movable in a direction perpendicular to the optical axis;
First driving means for moving the holding member in a first direction that is perpendicular to the optical axis;
An image blur correction apparatus comprising: a second driving unit configured to move the holding member in a second direction different from the first direction in a direction perpendicular to the optical axis;
The support means supports the holding member by a plurality of support members,
The second drive means is arranged at the center of a plurality of positions where the plurality of support members are attached to the holding member ,
The correction optical system, the first drive means, and the second drive means are straightened in the first direction so that the second drive means is between the correction optical system and the first drive means. An image blur correction device characterized by being arranged on a line . The plurality of support members are elastic members ,
The elastic member elastically supports the holding member so as to be movable in a direction perpendicular to the optical axis, and the elastic force acts as a restoring force for restoring the moved holding member to the optical axis center. Item 2. The image blur correction device according to Item 1. The holding member has a rectangular shape whose longitudinal direction is the first direction,
Wherein the plurality of support members are mounted near the four corners of the front Symbol holding member,
It said second drive means, the image blur correction apparatus according to claim 1 or 2, characterized in that arranged at the center of the holding member. The holding member has a circular shape ,
Wherein the plurality of support members is attached to the circular edge of the front Symbol holding member,
It said second drive means, the image blur correction apparatus according to claim 1 or 2, characterized in that arranged at the center of the holding member. The second driving means is arranged at a total restoring force point when the restoring forces generated in each of the plurality of elastic members are combined and the center of the total restoring force is regarded as the generating point of the restoring force of one elastic member. ,
The image blur correction apparatus according to claim 2 , wherein the first driving unit is arranged in the first direction passing through the total restoring force point. Wherein the first direction the second direction, the image blur correction device according to any one of claims 1 to 5, characterized in that forming the and another 90 degrees perpendicular to the optical axis. The image blur correction device according to claim 5, wherein the total restoring force point coincides with a center of gravity position of the holding member. A lens barrel characterized by comprising the image blur correction device according to any one of claims 1 to 7.   The lens barrel includes, in order from the object side, a bending optical system that bends light rays, a first lens system that is driven in the optical axis direction, the image blur correction device, a second lens system that is driven in the optical axis direction, The lens barrel according to claim 8, further comprising an imaging element. An image pickup apparatus comprising the image blur correction apparatus according to claim 1. The imaging device includes, in order from the object side, a bending optical system for bending the light beam, a first lens system driven in the optical axis direction, the image blur correction apparatus, a second lens system is driven in the optical axis direction, and The imaging apparatus according to claim 10, further comprising an imaging element.

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