JP2006215095A - Image blur correcting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image blur correcting device capable of moving a correction lens by small driving force and rapidly and accurately correcting the blur of an image. <P>SOLUTION: The image blur correcting device 50 is constituted of: a correction lens 13A correcting the blur of the image; a holding frame 52 holding the correction lens 13A; 1st and 2nd sliders 60 and 70 movably supporting the holding frame 52 in directions P and Y respectively; and 1st and 2nd coil motors 80 and 90 driving the 1st and the 2nd sliders 60 and 70 in the directions P and Y respectively. The 1st slider 60 is formed of a P guiding part 61 for a lens barrel (the 3rd moving barrel 23) formed in the direction P and a Y guiding part 62 for the holding frame 52 formed in the direction Y to be nearly L-shaped, and the 2nd slider 70 is formed of a Y guiding part 71 for the lens barrel formed in the direction Y and a P guiding part 72 for the holding frame 52 formed in the direction P to be nearly L-shaped. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image blur correction apparatus, and more particularly to an image blur correction apparatus in a portable optical device such as a camera.

The camera shake correction device supports the correction lens movably in a plane orthogonal to the photographing optical axis, and moves the correction lens with an actuator in a direction to cancel the vibration when the camera is vibrated. Image blur is corrected. For example, in the image blur correction apparatus described in Patent Document 1, a fixed frame of a correction lens is held by a first holding frame so as to be movable in the pitch direction, and the first holding frame is movable in the yaw direction. In this way, it is held in the second holding frame. Then, the image blur is corrected by moving the correction lens in the pitch direction or the yaw direction using the pitch coil attached to the fixed frame or the yaw coil attached to the first holding frame.
Patent 2641172

  However, in the image blur correction device described in Patent Document 1, the first holding frame is mounted on the second holding frame, and therefore, when the correction lens is moved in the yaw direction, the fixed frame and the first holding frame are used. Therefore, there is a problem that a large driving force is required. For this reason, there are a problem that the battery is consumed quickly and a problem that the movement of the correction lens is delayed and high-precision image blur correction cannot be performed.

  Further, Patent Document 1 has a problem in that high-accuracy image blur correction cannot be performed because the required driving force differs between when the correction lens is moved in the yaw direction and when the correction lens is moved in the pitch direction, and the movement characteristics change. there were.

  The present invention has been made in view of such circumstances, and provides an image blur correction apparatus that can move a correction lens with a small driving force and can perform image blur correction with high speed and high accuracy. With the goal.

  In order to achieve the above object, the invention according to claim 1 corrects an image blur formed by the imaging optical system, holds the correction optical system, and emits light from the imaging optical system. An optical system holding member that is movably supported in different first and second directions in a plane orthogonal to the axis, and the optical system holding member via a guide portion formed along the first direction. A substantially L-shaped first support that is slidably supported in the first direction and is slidably supported in the second direction by the lens barrel of the imaging optical system via a guide formed along the second direction. The optical system holding member is slidably supported in the second direction via a slider and a guide portion formed along the second direction, and via a guide portion formed along the first direction. Can slide in the first direction on the lens barrel of the imaging optical system. A substantially L-shaped second slider that is supported, connected to the first slider and driving the first slider in the first direction, and connected to the second slider, the second slider And a second driving means for driving in the second direction.

  According to the first aspect of the present invention, the first and second sliders are independently moved by driving the first and second driving means, and the optical system holding member of the correction optical system is the first. 1. Move in the second direction. That is, when the first driving means is driven, only the first slider moves and the optical system holding member moves in the first direction, and when the second driving means is driven, only the second slider moves. Then, the optical system holding member moves in the second direction. Therefore, since the first driving means only moves the first slider, an extra driving force for moving the second driving means and the second slider is not required, and the holding member can be moved with less power. . Similarly, since the second driving means only moves the second slider, an extra driving force for moving the first driving means and the first slider is not required, and the holding member can be moved with less power. Therefore, according to the first aspect of the present invention, the holding member can be moved with less power, so that power consumption can be reduced and image blur correction can be performed by moving the holding member quickly and accurately. Can be done accurately.

  According to the first aspect of the present invention, since the first and second sliders are formed in a substantially L shape, the correction optical system can be moved greatly without increasing the size of the apparatus. In other words, the first and second sliders according to claim 1 are formed in a substantially L shape suitable for increasing the guide range without increasing the size of the entire apparatus, thereby reducing the size of the apparatus and the correction optical system. Both expansion of the movement range can be achieved.

  According to a second aspect of the present invention, in the first aspect of the present invention, a buffer member is provided between the first and second sliders and the holding member or the lens barrel. Therefore, according to the invention of claim 2, when the first and second sliders and the holding member or the lens barrel collide, the shock can be absorbed by the buffer member. Shake can be suppressed.

  According to the image blur correction device of the present invention, the first and second sliders are independently moved by the first and second driving means, so that the holding member can be moved with less power. . In addition, since the first and second sliders are formed in a substantially L shape, the apparatus can be miniaturized while sufficiently securing the movable range of the correction optical system.

  Preferred embodiments of an image blur correction device according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a cross-sectional view showing a lens apparatus to which an image blur correction apparatus according to the present invention is applied. As shown in FIG. 1, the lens device 10 contains a first lens group 11, a second lens group 12, a third lens group 13, and a fourth lens group 14. Among these, the first lens group 11, the second lens group 12, and the fourth lens group 14 constitute an imaging optical system, and the third lens group 13 is a correction that corrects image blurring of the imaging optical system. An optical system is configured.

  The lens device 10 includes a fixed cylinder 20 fixed to the camera body 16, and a first moving cylinder 21, a second moving cylinder 22, and a third moving cylinder 23 that can be extended and retracted with respect to the fixed cylinder 20. ing. The first lens group 11 is held on the first moving cylinder 21, the second lens group 12 is held on the second moving cylinder 22, and the third lens group 13 is held on the third moving cylinder 23. The fixed cylinder 20, the first moving cylinder 21, the second moving cylinder 22, and the third moving cylinder 23 are arranged in an inner and outer multiplex with the optical axis O as the center. The fourth lens group 14 is held by a holding frame 24.

  The fixed cylinder 20 is a cylindrical member having an opening at one end and opening the other end. An imaging surface 26 of a photographing optical system is formed in the opening, and a holding frame 30 of a CCD 28 that is a photographing element is attached to the opening. The holding frame 30 is hooked to the edge of the opening, is pressed by a presser plate (not shown), and is attached to the opening. As a result, the CCD 28 held by the holding frame 30 is arranged on the image plane 26.

  A rotating cylinder 25 is supported outside the fixed cylinder 20 so as to be rotatable about the optical axis O. The rotating cylinder 25 is connected to the first moving cylinder 21 via a cam mechanism, and by rotating the rotating cylinder 25, the first moving cylinder 21 is extended or retracted in the direction of the optical axis O. ing. That is, a cam groove 32 is formed on the inner peripheral surface of the rotary cylinder 25, and the cam pin 34 of the first movable cylinder 21 is engaged with the cam groove 32. The cam pin 34 is disposed in a state of penetrating through a guide hole 36 in the optical axis O direction formed in the fixed cylinder 20. Accordingly, by rotating the rotary cylinder 25, the cam pin 34 engaged with the cam groove 32 moves, and this cam pin 34 is guided by the guide hole 36 and moves in the optical axis O direction. As a result, the first lens group 11 held by the first moving cylinder 21 can be moved in the direction of the optical axis O. Similarly, the rotating cylinder 25 is connected to the second moving cylinder 22 and the third moving cylinder 23 via a cam mechanism (not shown). By rotating the rotating cylinder 25, the second moving cylinder 22 and the third moving cylinder 25 are connected. The tube 23 moves in the direction of the optical axis O.

  The holding frame 24 that holds the fourth lens group 14 is guided by guide rods 38, 38 disposed in the optical axis O direction, and is supported so as to be movable in the optical axis O direction. It is configured to move in the optical axis direction in conjunction with each other.

  A fixed lens 13B and a correction lens 13A constituting the third lens group 13 are supported on the third moving cylinder 23, and an iris mechanism 40 is attached in front of the correction lens 13B. The fixed lens 13B is fixed to the third moving cylinder 23 and is disposed on the optical axis O. The correction lens 13A is movably supported on a surface orthogonal to the optical axis O, and image blur correction is performed by moving the correction lens 13A. Hereinafter, an image blur correction apparatus using the correction lens 13A will be described.

  FIG. 2 is an enlarged cross-sectional view of the image blur correction device 50, and FIG. 3 is an exploded perspective view of the image blur correction device 50. FIG. 4 is a cross-sectional view of the image blur correction device 50 as viewed in the optical axis O direction.

  As shown in these drawings, the image blur correction device 50 mainly includes a holding frame 52 that holds the correction lens 13A, a first slider 60 and a second slider 70 that support the holding frame 52, and the first slider 60. The first coil motor 80 and the second coil motor 90 move the second slider 70.

  The holding frame 52 is supported so as to be movable in two orthogonal directions within a plane orthogonal to the optical axis O. These two directions are a pitch direction (corresponding to the first direction: hereinafter referred to as P direction) and a yaw direction (corresponding to the second direction: hereinafter referred to as Y direction).

  The outer shape of the holding frame 52 is formed in a substantially rectangular shape. As shown in FIG. 4, a P guide bar 54 arranged in the P direction and a Y guide bar 55 arranged in the Y direction are attached to the side surface of the holding frame 52. On the other hand, the third moving cylinder 23 holds a P guide bar 56 disposed in the P direction and a Y guide bar 57 disposed in the Y direction. The P guide bar 56 and the Y guide bar 57 are respectively disposed on the opposite sides of the P guide bar 54 and the Y guide bar 55 with the optical axis O interposed therebetween.

  The first slider 60 has a P guide portion 61 formed in the P direction and a Y guide portion 62 formed in the Y direction, and is formed in an approximately L shape by the P guide portion 61 and the Y guide portion 62. ing. The P guide portion 61 has protrusions 61A and 61A (see FIG. 4) at both ends of the outer side surface thereof, and guide holes (not shown) through which the above-described P guide rod 56 is inserted into the protrusions 61A and 61A. Is formed. Therefore, by inserting the P guide rod 56 through the guide holes of the protrusions 61A and 61A, the first slider 60 is supported so as to be slidable in the P direction with respect to the third moving cylinder 23.

  Protruding portions 62A and 62A are formed on both ends of the upper surface of the Y guide portion 62 of the first slider 60, and a guide hole (not shown) through which the Y guide rod 55 is inserted into the protruding portions 62A and 62A. ) Is formed. Therefore, by inserting the Y guide rod 55 through the guide holes of the protrusions 62A and 62A, the first slider 60 is supported so as to be movable in the Y direction with respect to the holding frame 52.

  In addition, the Y guide portion 62 of the first slider 60 has a pair of clamping portions 62B and 62B that protrude outward. The sandwiching portions 62B and 62B are arranged to face each other and are formed in an arc shape as shown in FIG. 3, so that the coil 81 of the first coil motor 80 can be held. The first coil motor 80 is configured to drive the coil 81 in the P direction when driven.

  The holding portion 62B is provided with a projection 62C for preventing rattling. The protrusion 62C is inserted into and engaged with a groove 63 formed in the third moving cylinder 23, thereby preventing the first slider 60 from rattling in the optical axis O direction.

  The second slider 70 has a Y guide portion 71 formed in the Y direction and a P guide portion 72 formed in the P direction, and is formed in a substantially L shape by the Y guide portion 71 and the P guide portion 72. Yes. As shown in FIG. 4, the second slider 70 is disposed on the same plane as the first slider 60 in a plane orthogonal to the optical axis O, and the optical axis O is formed by the first slider 60 and the second slider 70. Are arranged so as to form a rectangular frame surrounding the.

  The Y guide portion 71 of the second slider 70 has projecting portions 71A and 71A at both ends of the outer side surface thereof, and guide holes (not shown) through which the Y guide rods 57 are inserted into the projecting portions 71A and 71A. Is formed. Therefore, by inserting the Y guide rod 57 through the guide hole of the protrusion 71A, the second slider 70 is supported slidably in the Y direction with respect to the third moving cylinder 23.

  Protrusions 72A and 72A are formed on both ends of the upper surface of the P guide portion 72 of the second slider 70, and guide holes through which the aforementioned P guide rods 54 are inserted are formed in the protrusions 72A and 72A. Has been. Therefore, the second slider 70 is supported so as to be movable in the P direction with respect to the holding frame 52 by inserting the P guide rod 54 through the guide hole of the protrusion 72A.

  In addition, a pair of sandwiching portions 72B and 72B are formed to project from the P guide portion 72 of the second slider 70. The sandwiching portions 72B and 72B are arranged to face each other, and are formed in an arc shape as shown in FIG. 3, so that the coil 91 of the second coil motor 90 can be held. The second coil motor 90 is configured to drive the coil 91 in the Y direction when driven.

  The clamping portion 72B is provided with a protrusion 72C for preventing rattling. The protrusion 72C is inserted into and engaged with a concave groove 73 formed in the third moving cylinder 23, thereby preventing the second slider 70 from rattling in the optical axis O direction.

  As shown in FIG. 4, Hall elements 64 and 74 are attached to the first slider 60 and the second slider 70, respectively. Magnets 66 and 76 (see FIG. 3) are attached to the third moving cylinder 23 at positions facing the hall elements 64 and 74. Therefore, the positions of the first slider 60 and the second slider 70 can be detected by the position detection sensor including the Hall elements 64 and 74 and the magnets 66 and 76. The configuration of the position detection sensor is not limited to this. For example, a non-contact sensor composed of an LED and a PSD (Position Sensor Device) may be used.

  Cylindrical buffer members 58 and 58 are attached to the P guide rod 56 and the Y guide rod 57 attached to the third moving cylinder 23 described above. The buffer members 58, 58 are made of a material that absorbs impact, such as rubber or urethane resin, and between the first slider 60 and the third moving cylinder 23 or between the second slider 70 and the third moving cylinder 23. Is arranged. Therefore, when the first slider 60 and the third moving cylinder 23 collide, or when the second slider 70 and the third moving cylinder 23 collide, the shock can be absorbed by the buffer member 58, and the first due to the impact. Damage to the slider, the second slider, and the third moving cylinder is prevented.

  Similarly, cylindrical buffer members 59 and 59 are attached to the P guide bar 54 and the Y guide bar 55 of the holding frame 52. The buffer members 59 and 59 are made of a material that absorbs impact, such as sponge or urethane resin, and are disposed between the second slider 70 and the holding frame 52 or between the first slider 60 and the holding frame 52. Therefore, when the second slider 70 and the holding frame 52 collide, or when the first slider 60 and the holding frame 52 collide, the shock can be absorbed by the buffer member 59. Damage to the slider and the third moving cylinder is prevented.

  The first coil motor 80 is mainly composed of a coil 81, a U-shaped yoke 82, and a disk-shaped yoke 83, and the coil 81 is held by the first slider 60 described above. The U-shaped yoke 82 is fixed to the third moving cylinder 23, and one end 82 </ b> A is inserted into the hollow portion of the coil 81. A magnet 84 is attached to the other end of the U-shaped yoke 82 so as to face the coil 81. The disc type yoke 83 is formed in a ring shape from a metal plate and is fixed to the third moving cylinder 23. A magnet 85 is attached to the disk-shaped yoke 83 so as to face the coil 81. Further, the iris mechanism 40 shown in FIG. The disk type yoke 83 is also used as a magnetic shielding member for the iris mechanism 40.

  The second coil motor 90 is mainly composed of a coil 91, a U-shaped yoke 92, and the aforementioned disk-shaped yoke 83, and the coil 91 is held by the second slider 70. The U-shaped yoke 92 is attached to the third moving cylinder 23, and one end portion 92 </ b> A is inserted through the hollow portion of the coil 91. A magnet (not shown) is attached to the other end 92 </ b> B of the U-shaped yoke 92 so as to face the coil 91. The disc type yoke 83 is also used as the first coil motor 80, and a magnet 95 is attached to face the coil 91.

  Next, the operation of the image blur correction device 50 configured as described above will be described.

  When the first coil motor 80 is driven, the driving force is transmitted to the first slider 60 to which the coil 81 is attached, and the first slider 60 moves in the P direction. As a result, the holding frame 52 attached to the first slider 60 via the Y guide rod 55 moves in the P direction, and the correction lens 13A moves in the P direction. At this time, since the second slider 70 is supported so as to be slidable in the P direction with respect to the holding frame 52, the second slider 70 does not move. That is, when the first coil motor 80 is driven, the second slider 70 does not move, and only the first slider 60 moves independently.

  On the other hand, when the second coil motor 90 is driven, the driving force is transmitted to the second slider 70 attached to the coil 91, and the second slider 70 moves in the Y direction. As a result, the holding frame 52 attached to the second slider 70 via the P guide rod 54 moves in the Y direction, and the correction lens 13A moves in the Y direction. At this time, since the first slider 60 is supported so as to be slidable in the Y direction with respect to the holding frame 52, the first slider 60 does not move. That is, when the second coil motor 90 is driven, the first slider 60 does not move and only the second slider 70 moves independently.

  As described above, according to the present embodiment, the first slider 60 and the second slider 70 move independently by driving the first coil motor 80 and the second coil motor 90, respectively. The holding frame 52 of the lens 13A can be moved in the P direction and the Y direction. That is, since the first coil motor 80 does not need to move the second slider 70 or the second coil motor 90, the holding frame 52 can be moved in the P direction with a small amount of power. 90 does not require the first slider 60 or the first coil motor 80 to be moved, so that the holding frame 52 can be moved in the Y direction with less power. Therefore, according to the present embodiment, the power for moving the holding frame 52 can be reduced.

  Further, according to the present embodiment, by driving the first coil motor 80 and the second coil motor 90, respectively, the first slider 60 and the second slider 70 are independently moved. And can be moved accurately. That is, when the first coil motor 80 is driven, the second slider 70 and the second coil motor 90 are not affected. Similarly, when the second coil motor 90 is driven, the first slider 60 and the second coil motor 90 are not affected. Since it is not affected by the one-coil motor 80, the holding frame 52 can be moved accurately. Therefore, highly accurate image blur correction can be performed by the correction lens held by the holding frame 52.

  Furthermore, according to the present embodiment, the first and second coil motors 80 and 90 are combined with the co-shaped yokes 82 and 92 and the disk-shaped yoke 83, so that a large driving force is ensured, and The first coil motor 80 and the second coil motor 90 can be reduced in size. That is, when two U-shaped yokes are connected and used without using the disk-shaped yoke 83, in order to insert and arrange the two U-shaped yokes in the hollow portions of the coils 81, 91, There is a problem that the hollow portion needs to be enlarged, and the coil motor is increased in size accordingly. In that case, since it is necessary to provide a separate magnetic shielding member for the iris mechanism 40, there is a problem that the apparatus becomes large. On the other hand, in the present embodiment, since the disc-shaped yoke 83 and the U-shaped yokes 81 and 91 are combined, only one U-shaped yoke 82 and 92 needs to be inserted and arranged in the coils 81 and 91. The coils 81 and 91 can be made small. Therefore, the first coil motor 80 and the second coil motor 90 can be reduced in size, and further, the provision of the disk-shaped yoke 83 eliminates the need for providing a separate magnetic shielding member, thereby reducing the size of the entire apparatus. it can.

Sectional drawing which shows the structure of the lens apparatus to which the image blurring correction apparatus which concerns on this invention was applied Sectional view showing image blur correction device The perspective view which shows the structure of an image blur correction apparatus Front view of image blur correction device

Explanation of symbols

  13A ... Correction lens, 23 ... Third moving cylinder, 50 ... Image blur correction device, 52 ... Holding frame, 54, 56 ... P guide rod, 55, 57 ... Y guide rod, 60 ... First slider, 70 ... Second Slider, 80 ... first coil motor, 90 ... second coil motor

Claims (2)

A correction optical system for correcting blurring of an image formed by the imaging optical system;
An optical system holding member that holds the correction optical system and is movably supported in different first and second directions within a plane orthogonal to the optical axis of the imaging optical system;
The optical system holding member is slidably supported in the first direction via a guide portion formed along the first direction, and the image is formed via a guide portion formed along the second direction. A substantially L-shaped first slider that is slidably supported in a second direction on a lens barrel of the optical system;
The optical system holding member is slidably supported in the second direction via a guide portion formed along the second direction, and the image is formed via the guide portion formed along the first direction. A substantially L-shaped second slider that is slidably supported in the first direction by the lens barrel of the optical system;
A first drive means connected to the first slider and driving the first slider in the first direction;
A second driving means connected to the second slider and driving the second slider in the second direction;
An image blur correction apparatus comprising:   The image blur correction apparatus according to claim 1, wherein a buffer member is provided between the first and second sliders and the holding member or the lens barrel.

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