JP5650906B2 - Image blur correction mechanism and imaging apparatus - Google Patents

Description

  The present invention relates to an image blur correction mechanism for correcting an image blur due to a camera shake or the like, and an imaging apparatus including such an image blur correction mechanism.

  In recent years, an image of a subject formed by a plurality of lenses is received by an image sensor such as a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) sensor, and the light received by the image sensor is photoelectrically converted. Imaging devices such as a digital video camera and a digital still camera that output as an electrical signal and generate and record a digital image corresponding to an image of a subject have become widespread.

  In such an imaging apparatus, at least one lens or a lens group (referred to as a correction lens) among a plurality of lenses that form an image of a subject is moved in a plane orthogonal to the optical axis. Have proposed a so-called image blur correction mechanism (also referred to as a camera shake correction mechanism) that optically corrects image blur caused by camera shake or the like (see, for example, Patent Document 1).

  Specifically, an image shake correction apparatus described in Patent Document 1 below includes a lens holding member that holds a correction lens and a first lens holding member that is movable in the pitching direction within a plane orthogonal to the optical axis. A holding member; a second holding member that movably holds the first holding member in a yawing direction along a circular arc centered on the rotation axis in a plane orthogonal to the optical axis; and the lens holding member as the first holding member In contrast, a linear drive unit that linearly drives in the pitching direction and a rotary drive unit that rotates the first holding member relative to the second holding member are provided.

  The straight drive unit and the rotation drive unit include a magnet and a coil for driving in the pitching direction and the yawing direction, and a magnetic field generated by energizing the coil and a magnetic field generated by the magnet facing the coil. A driving force is generated in each direction by the magnetic action.

  In this image blur correction apparatus, it is possible to correct the image blur caused by the movement of the camera by moving the correction lens in the pitching direction and the yawing direction.

JP 2007-241254 A

  By the way, in the imaging apparatus, due to the recent demand for miniaturization (light weight) and power saving, the lens barrel on which the plurality of lenses, the imaging element, and the like described above are rapidly miniaturized. Along with this, there is an increasing demand for miniaturization (light weight) and power saving of the image blur correction mechanism mounted on the lens barrel.

  However, the image shake correction apparatus described in Patent Document 1 described above requires many parts to move the correction lens in the pitching direction and the yawing direction, and the overall size of the apparatus is reduced by increasing the number of parts. In addition, it is difficult not only to reduce the weight but also to increase the manufacturing cost.

  Also, in the image blur correction mechanism, an actuator that ensures high correction performance over a wide frequency band from a low frequency to a high frequency is required. Here, in order to ensure high correction performance in the image blur correction mechanism, it is conceivable to drive the correction lens with a large driving force. However, increasing the size of the actuator to ensure a large driving force not only increases power consumption and the size of the driving magnet, but also controls the actuator by increasing the frictional force accompanying an increase in weight. The problem that it becomes difficult to ensure the gain of the servo at the time will occur.

  For this reason, the above-described image blur correction mechanism requires an actuator that can perform a smooth correction operation with a small driving force. To realize such an actuator, the frictional force when driving the correction lens is reduced. Reduction is very important.

  The present invention has been proposed in view of such conventional circumstances, and it is possible to perform smooth correction operation with less driving force while reducing power consumption during driving, as well as reducing size and weight. It is an object of the present invention to provide an image blur correction mechanism and an image pickup apparatus that can realize further downsizing (light weight) and power saving by including such an image blur correction mechanism.

In order to achieve the above object, an image shake correction mechanism according to the present invention includes a lens holding member that holds at least one lens among a plurality of lenses that form an image of a subject with respect to a support portion. This is to correct image blur by moving in a first direction and a second direction orthogonal to each other in a plane orthogonal to the optical axis, and to connect between the lens holding member and the support portion. A first shaft provided on the other side is engaged with a first shaft hole provided on one of the one end side of the connecting member and the lens holding member. The lens holding member is rotatably supported with respect to the connecting member around the portion, and is provided on the other side of the second shaft hole provided on either the other end side of the connecting member or the support portion. The second shaft portion is centered by engaging the second shaft portion. Coupling member is rotatably supported to the support portion further includes a first drive unit for generating a driving force for moving the lens holding member in a first direction, a lens holding member second direction A second driving unit that generates a driving force to be moved to the first driving unit, the first driving unit and the second driving unit are arranged side by side in the first direction across the optical axis, and the lens holding member The rotation center is arranged side by side in the first direction together with the first and second drive units, is located outside the first drive unit, and the optical axes of the plurality of lenses coincide with each other. A straight line connecting the rotation center of the lens holding member and the lens center is parallel to the first direction, and a straight line connecting the rotation centers of the one end side and the other end side of the connecting member is parallel to the second direction. The driving unit and the second driving unit are provided on either the lens holding member or the support unit. When, and a magnet provided on the other, the magnetic field generated by energizing the coil to generate a driving force by magnetic action between the magnetic field generated by the magnet opposed to the coil, a support portion a plurality of balls interposed between the lens holding member, Rutotomoni lens holding member is movably supported in a plane perpendicular to the optical axis with respect to the support portion, and a magnet provided on the lens holding member side In addition, a plurality of balls are held between the support portion and the lens holding member by a magnetic attraction generated between the back yoke provided on the support portion side, and the lens. A first position detecting unit that detects a position of the holding member in the first direction; a second position detecting unit that detects a position of the lens holding member in the second direction; and first and second driving units. A control unit that controls the driving of the lens holding member, and the control unit moves the lens holding member in the first or second direction based on the position information of the lens holding member detected by the first and second position detection units. A correction signal is generated for moving the lens holding member in a direction to cancel the positional deviation in the second or first direction that occurs when the first and second driving units are driven, and the first and second driving units are driven based on the correction signal. It is characterized by controlling .

Further, an imaging apparatus according to the present invention includes a plurality of lenses that form an image of a subject, a lens holding member that holds at least one lens among the plurality of lenses, and a support portion that supports the lens holding member. A lens barrel that holds a plurality of lenses, an image sensor that captures an image of a subject formed by the plurality of lenses, and a lens holding member in a plane perpendicular to the optical axis with respect to the support portion. The image blur correction mechanism corrects the image blur by moving the image blur correction mechanism, and the image blur correction mechanism includes the image blur correction mechanism.

  As described above, in the image blur correction mechanism according to the present invention, it is possible to perform smooth correction operation with a small driving force while reducing power consumption during driving, as well as reducing the size and weight. Further, in the imaging apparatus according to the present invention, by providing such an image blur correction mechanism, it is possible to further reduce the size (light weight) and save power.

FIG. 1 is a perspective view showing an appearance of an imaging apparatus to which the present invention is applied. FIG. 2 is an exploded perspective view of the imaging apparatus shown in FIG. FIG. 3 is an exploded perspective view showing a configuration of an image blur correction mechanism to which the present invention is applied. FIG. 4 is a perspective view showing an assembly structure of the image blur correction mechanism shown in FIG. FIG. 5A is a schematic diagram illustrating an operation of rotating the lens holding member in the pitching direction, and FIG. 5B is a schematic diagram illustrating an operation of rotating the lens holding member in the yawing direction. FIG. 6 is a perspective view showing the configuration of the control unit. FIG. 7 is a perspective view showing a modification of the image blur correction mechanism to which the present invention is applied.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
An imaging apparatus 1 shown in FIG. 1 as an embodiment of the present invention is an application of the present invention to a digital video camera capable of capturing a moving image or a still image, for example. Note that the present invention is not limited to digital video cameras and can be widely applied to imaging apparatuses that can include an image blur correction mechanism to which the present invention is applied, such as digital still cameras.

  The imaging apparatus 1 includes a lens barrel 2 that holds a plurality of lenses (not shown), and among the plurality of lenses that are arranged in the lens barrel 2 with their optical axes aligned, zooming is performed. The lens for focusing and the lens for focusing are displaced in the optical axis direction to perform zooming (magnification) operation and focusing (focus adjustment) operation, and the subject image formed by these multiple lenses. The image is received by an imaging device (not shown) such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor) sensor attached to the rear end of the lens barrel 2, and the light received by the imaging device is received. Photoelectrically converted and output as an electrical signal to generate a digital image corresponding to the subject image and record it on a recording medium such as an HDD (Hard Disk Drive), a memory card, an optical disk, or a magnetic tape It is possible.

  Specifically, as shown in FIGS. 1 and 2, the lens barrel 2 constituting the imaging device 1 is divided into a front barrel 2a and a rear barrel 2b in the front-rear direction of the optical axis. Have. Among these, a plurality of attached portions 3 in which screw holes 3a are formed are arranged in the circumferential direction on the outer peripheral portion on the back side of the front barrel 2a. On the other hand, on the outer peripheral portion on the front side of the rear barrel 2b, a plurality of mounting portions 4 in which through holes 4a are formed are provided side by side in the circumferential direction corresponding to the plurality of mounted portions 3. The front lens barrel 2a and the rear lens barrel 2b are joined and integrated by screwing screws 5 into the plurality of screw holes 3a through the plurality of through holes 4a.

  Although not shown, the imaging device 1 drives the zoom lens disposed in the front lens barrel 2a and the focus lens disposed in the rear lens barrel 2b, respectively, in the direction of the optical axis. A lens driving mechanism is provided. The lens driving mechanism slidably supports the lens holding frame holding the zoom lens and the lens holding frame holding the focusing lens in the optical axis direction by a pair of guide shafts. The lens holding frames supported by the pair of guide shafts can be independently driven to be displaced in the optical axis direction by drive motors such as stepping motors attached to the lens barrel 2a and the rear lens barrel 2b. ing.

  In addition, the imaging apparatus 1 arranges a stop in the optical path between the front lens barrel 2a and the rear lens barrel 2b, and adjusts the aperture of the aperture, and light that has passed through the aperture of the aperture The optical unit 6 is integrated with a filter insertion / removal mechanism for inserting / removing an optical filter such as an ND (Neutral Density) filter.

  In addition, the imaging apparatus 1 includes an image blur correction mechanism 30 to which the present invention is applied between the front lens barrel 2a and the rear lens barrel 2b. The image blur correction mechanism 30 includes at least one lens (hereinafter collectively referred to as a correction lens) among a plurality of lenses that form an image of a subject and are orthogonal to each other within a plane orthogonal to the optical axis. By moving in the yawing (horizontal) direction (first direction) and the pitching (vertical) direction (second direction), image blur due to camera shake or the like is optically corrected.

  Specifically, as shown in FIGS. 3 and 4, the image shake correction mechanism 30 includes a fixing member 31 that is fixed to the lens barrel 2, a lens holding member 32 that holds the correction lens, and a fixing member 31. A connecting member 33 that connects the lens holding member 32 and a back plate 34 disposed on the back side of the lens holding member 32 are provided.

  The fixing member 31 is made of a frame-like member having a shape corresponding to the outer shape of the lens barrel 2 and has an opening 35 through which light passes at a substantially central portion thereof. The fixing member 31 is provided with a first shaft portion 36 that protrudes from a surface (back surface) facing the lens holding member 32 in a direction parallel to the optical axis. The first shaft portion 36 is provided so as to be located upward by a corresponding length of the connecting member 33 from one end side in the horizontal direction (first direction) passing through the center (optical axis) of the opening 35. Yes.

  The lens holding member 32 is formed in a plate shape having a size and thickness that fits inside the fixing member 31 and has a lens holding frame 37 that holds the correction lens at a substantially central portion thereof. Further, the lens holding member 32 is provided with a second shaft portion 38 that protrudes from a surface (front surface) facing the fixing member 31 in a direction parallel to the optical axis. The second shaft portion 38 is provided on one end side in the horizontal direction (first direction) passing through the center (optical axis) of the lens holding frame 37.

  The connecting member 33 is made of a long plate-like member, and has a first shaft hole 39 and a second shaft hole 40 on one end side and the other end side thereof. In the image blur correction mechanism 30, the first shaft portion 36 of the fixing member 31 is engaged with the first shaft hole 39 of the connecting member 33, so that the first shaft portion 36 is connected as a center. The member 33 is rotatably supported with respect to the fixing member (supporting portion) 31 and the second shaft portion 38 of the lens holding member 32 is engaged with the second shaft hole 40 of the connecting member 33. Thus, the lens holding member 32 is supported so as to be rotatable with respect to the connecting member 33 around the second shaft portion 38.

  Thereby, in the image blur correction mechanism 30, the lens holding member 32 is attached in a state of being opposed to the fixing member 31 serving as the support portion via the connecting member 33, and the lens holding member 32 is in a plane orthogonal to the optical axis. It is possible to move (rotate) in a yawing direction (first direction) and a pitching direction (second direction) orthogonal to each other.

  Further, in the image blur correction mechanism 30, in a state where the optical axes of the plurality of lenses are coincident (in a steady state), a straight line connecting the rotation center of the lens holding member 32 and the lens center is the first direction (horizontal direction). A straight line connecting the rotation centers of one end side and the other end side of the connecting member 33 is parallel to the second direction (vertical direction). That is, the lens holding member 32 and the connecting member 33 are arranged so that these straight lines are orthogonal to each other in a normal state.

  The back plate 34 is a plate-like member that forms a space for housing the lens holding member 32 with the fixing member 31, and an opening 41 through which light passes is provided at a substantially central portion thereof. A plurality of positioning holes 42 a and 42 b are provided around the opening 41 of the back plate 34. Correspondingly, on the fixing member 31, a positioning pin 44a having a positioning projection 43 formed at the tip and a positioning pin 44b having a screw hole 45 formed at the tip are opposed to the back plate 34, respectively. It protrudes from the surface (back surface) in a direction parallel to the optical axis.

  The fixing member 31 and the back plate 34 are fitted with the positioning projections 43 in the positioning holes 42a in a state where the positioning pins 44a and 44b and the positioning holes 42a and 42b are aligned. By screwing the screw 46 into the screw hole 45 through 42b, the lens holding member 32 is joined and integrated in a space formed therebetween.

  In addition, the lens holding member 32 disposed in this space has a yawing direction (first direction) in which the correction lens is swung left and right within a plane orthogonal to the optical axis, and a pitching direction (first direction) in which the correction lens is swung up and down. 2 direction).

  The image blur correction mechanism 30 includes a first driving unit 47 that generates a driving force that moves the lens holding member 32 in the yawing direction, and a second driving unit that generates a driving force that moves the lens holding member 32 in the pitching direction. Drive unit 48.

  Specifically, the first and second drive units 47 and 48 include a pair of coils 49a and 49b provided on the fixing member 31 side, and a pair of magnets 50a and 50b provided on the lens holding member 32 side. have.

  The pair of coils 49a and 49b are attached to the pair of attachment protrusions 51a and 51b provided on the back surface of the fixing member 31 in a wound state. The pair of coils 49a and 49b are arranged side by side in the horizontal direction (first direction) with the center (optical axis) of the opening 35 interposed therebetween. Among these, the coil 49a constituting the first drive unit 47 is an oval shape that is elongated in the vertical direction (second direction), and the coil 49b constituting the second drive unit 48 is horizontal (first first). It has an oval shape that becomes longer in the direction.

  The pair of magnets 50 a and 50 b are attached inside the pair of attachment holes 52 a and 52 b formed in the lens holding member 32 in a state of being fitted from the surface (front surface) side facing the fixing member 31. The pair of magnets 52a and 52b are arranged side by side in the horizontal direction (first direction) with the center (optical axis) of the lens holding frame 37 interposed therebetween. Among these, the magnet 52a which comprises the 1st drive part 47 is magnetized in a horizontal direction (1st direction), and the magnet 52b which comprises the 2nd drive part 48 is a perpendicular direction (2nd direction). Is magnetized.

  Further, a pair of back yokes 53 a and 53 b facing the pair of magnets 50 a and 50 b are attached to the back side of the pair of mounting holes 52 a and 52 b in a state of being fitted from the back side of the lens holding member 32. . The back yokes 53a and 53b are magnetically attracted to the magnets 50a and 50b, thereby sandwiching the step portions 52c and 52d formed inside the mounting holes 52a and 52b together with the magnets 50a and 50b. This prevents the magnets 50a and 50b and the back yokes 53a and 53b from falling off the mounting holes 52a and 52b.

  Similarly, on the front surface of the fixing member 31, although not shown, a pair of mounting recesses are provided at positions facing the pair of coils 49a and 49b, and a pair of back yokes are disposed in the pair of mounting recesses. Yes.

  In the image blur correction mechanism 30, the back yoke on the fixing member 31 side is magnetically attracted to the magnets 50 a and 50 b on the lens holding member 32 side in a state where the fixing member 31 and the lens holding member 32 face each other. Thus, the fixing member 31 and the lens holding member 32 are pressed against each other. Thereby, the state where the fixing member 31 and the lens holding member 32 face each other is held.

  A plurality of balls 54 are disposed between the fixing member 31 and the lens holding member 32. The plurality of balls 54 are for smoothly moving the lens holding member 32 in a plane orthogonal to the optical axis with respect to the fixing member 31. The plurality of balls provided on the back side of the fixing member 31. It is arranged in a state of being sandwiched between the receiving portion 55 and a plurality of ball abutting portions (not shown) provided on the front side of the lens holding member 32 so as to face the ball receiving portions 55. . It should be noted that at least three balls 54 are preferably arranged side by side between the fixing member 31 and the lens holding member 32 in the circumferential direction.

  In the image blur correction mechanism 30, the plurality of balls 54 are interposed between the ball receiving portion 55 and the ball contact portion, and the above-described magnets 50 a and 50 b on the lens holding member 32 side and the back on the fixing member 31 side. The plurality of balls 54 are sandwiched between the fixing member 31 and the lens holding member 32 by a magnetic attractive force generated between the yoke and the yoke. Thereby, the lens holding member 32 can be smoothly moved with respect to the fixing member 31 in the yawing direction and the pitching direction in a plane orthogonal to the optical axis.

  Further, in this image blur correction mechanism 30, the first drive unit 47 has the lens by the magnetic action of the magnetic field generated by energizing the coil 49a and the magnetic field generated by the magnet 50a facing the coil 49a. A driving force for moving the holding member 32 in the yawing direction is generated. On the other hand, the second drive unit 48 rotates the lens holding member 32 in the pitching direction by the magnetic action of the magnetic field generated by energizing the coil 49b and the magnetic field generated by the magnet 50b facing the coil 49b. Generate driving force to move.

  In the image blur correction mechanism 30 having the above-described structure, the lens holding member 32 that holds the correction lens is moved in the pitching direction and the yawing direction with respect to the fixing member 31, thereby causing the movement of the imaging device 1. It is possible to optically correct image shake.

  By the way, in the image blur correction mechanism 30 to which the present invention is applied, the lens holding member 32 connected to the fixing member 31 via the connecting member 33 is yawing directions (first direction) orthogonal to each other in a plane orthogonal to the optical axis. ) And the pitching direction (second direction), the connecting member 33 rotates with respect to the fixing member 31, and the lens holding member 32 rotates with respect to the connecting member 33. Yes.

  Here, when the guide pin is slid in the guide slit as in the prior art and the lens holding member is guided in the yawing direction or the pitching direction, the frictional force generated when the guide pin slides in the guide slit is It becomes a sliding frictional force. On the other hand, the frictional force generated when the first and second shaft portions 36 and 38 rotate in the first and second shaft holes 39 and 40 as in the present invention is a rolling friction force. Therefore, it is possible to make the frictional force much smaller than when the sliding frictional force works.

  As a result, in the present invention, it is possible to set a high servo gain when driving and controlling the image blur correction mechanism 30. As a result, the response at a high frequency is improved. It is possible to maintain a good image blur correction performance while securing a sufficient gain over a wide frequency band.

  Further, in the present invention, since the lens holding member 32 is moved in the pitching direction and the yawing direction, the lens holding member 32 and the fixing member 31 are connected only by the connecting member 33, thereby simplifying the parts. Therefore, it is possible to further reduce the size and weight. Further, by reducing the frictional force when moving the lens holding member 32 described above, it is possible to suppress power consumption during driving and perform a smooth correction operation with a small driving force.

  Further, the image blur correction mechanism 30 has a configuration in which the first drive unit 47 and the second drive unit 48 are arranged in the horizontal direction with the optical axis in between. In this case, in the lens barrel 2, a driving motor for driving the zoom lens and the focusing lens described above and a driving motor for driving the diaphragm adjusting mechanism and the filter insertion / removal mechanism described above are respectively used as light. By arranging the shafts side by side in the vertical direction, the lens barrel 2 can be designed more compactly while avoiding interference between the drive motors and the first and second drive units 47 and 48. It becomes.

  In the image blur correction mechanism 30, the rotation center (second shaft portion 38) of the lens holding member 32 is arranged side by side in the horizontal direction together with the first and second drive portions 47 and 48. The lens holding member 32 is moved in the pitching direction by the second driving portion 47 located on the side away from the rotation center of the lens holding member 32 because the lens holding member 32 is located outside the first driving portion 47. It can be stably rotated.

  As described above, in the present invention, it is possible to further reduce the size and weight of the image blur correction mechanism 30, suppress power consumption during driving, and perform a smooth correction operation with a small driving force. Is possible. Therefore, in the imaging apparatus 1 including such an image blur correction mechanism 30, it is possible to achieve power saving as well as further miniaturization and weight reduction.

  By the way, in the image blur correction mechanism 30, when the lens holding member 32 is moved in the pitching direction Y with respect to the fixed member 31 as shown in FIG. By rotating the lens holding member 32 in the yawing direction X with respect to the member 33, the center of the correction lens L held by the lens holding member 32 is shifted in the pitching direction Y. On the other hand, as shown in FIG. 5B, when the lens holding member 32 is moved in the pitching direction Y with respect to the fixing member 31, the connecting member 33 is rotated in the pitching direction Y with respect to the fixing member 31. As a result, the center of the correction lens L held by the lens holding member 32 is shifted in the yawing direction X.

  Such a positional shift in the pitching direction Y or the yawing direction X that occurs when the lens holding member 32 is moved in the yawing direction X or the pitching direction Y is referred to as crosstalk. There is a risk that the screen shakes depending on the sensitivity.

  Therefore, the image blur correction mechanism 30 performs a correction operation for canceling such crosstalk. Specifically, as shown in FIGS. 4 and 6, the image blur correction mechanism 30 has a first position detection that detects the position of the lens holding member 32 in the yawing direction X as a configuration for canceling crosstalk. , A second position detector 62 that detects the position of the lens holding member 32 in the pitching direction Y, and a controller 63 that controls the driving of the first and second drivers 47 and 48. .

  The first and second position detectors 61 and 62 are, for example, Hall sensors, and are arranged at the center of the back surface of the magnets 50a and 50b constituting the first and second drive units 47 and 48, respectively. Yes.

  As shown in FIG. 6, the control unit 63 includes a microcomputer (CPU) or the like, and performs crosstalk based on position information of the lens holding member 32 detected by the first and second position detection units 61 and 62. A movement amount (correction amount) of the lens holding member 32 necessary for canceling is calculated, and a correction signal based on the calculation result is sent to the first drive driver 64a for driving the first drive unit 47, and the first drive. To the first drive driver 64b for driving the unit 47. The drive drivers 64a and 64b drive the first and second drive units 47 and 48 based on the correction signal, and are generated when the lens holding member 32 moves in the yawing direction X or the pitching direction Y. The lens holding member 32 is moved in a direction to cancel the positional deviation in the pitching direction Y or the yawing direction X.

  Here, the correction amount for canceling the crosstalk can be obtained in advance by calculation. That is, in a simple calculation ignoring the arrangement of the first and second position detectors 61 and 62, the pitching direction Y or the proportion of the lens holding member 32 is proportional to the amount of rotation in the yawing direction X or the pitching direction Y. The deviation amount (crosstalk amount) in the yawing direction X increases. Therefore, when the rotation angle in the yawing direction X or the pitching direction Y is θ and the distance from the rotation center to the center of the correction lens L is r, the crosstalk amount can be obtained as r (1−cos θ).

  However, in actuality, the first and second position detectors 61 and 62 cannot be arranged at the center of the correction lens L held by the lens holding member 32, and therefore the position of the lens holding member 32 in a state where a coefficient is applied. Therefore, the amount of crosstalk cannot be simply obtained.

  Therefore, in the present invention, the control unit 63 shown in FIG. 6 performs pitching with respect to the movement amount of the lens holding member 32 in the yawing direction X based on the position information of the lens holding member 32 detected by the first position detection unit 61. The crosstalk amount in the direction Y is calculated. Further, the calculation result is multiplied by a coefficient to calculate the crosstalk amount at the center (optical axis) of the correction lens. Based on this calculation result, the movement amount (correction amount) of the lens holding member 32 necessary to cancel the crosstalk in the pitching direction Y of the lens holding member 32 is calculated, and this calculation result is used as the lens holding member 32. This is added as a correction value when calculating the movement amount in the pitching direction Y.

  On the other hand, based on the position information of the lens holding member 32 detected by the second position detection unit 62, the crosstalk amount in the yawing direction X with respect to the movement amount of the lens holding member 32 in the pitching direction Y is calculated. Further, the calculation result is multiplied by a coefficient to calculate the crosstalk amount at the center (optical axis) of the correction lens. Based on this calculation result, the movement amount (correction amount) of the lens holding member 32 necessary for canceling the crosstalk in the yawing direction X of the lens holding member 32 is calculated, and this calculation result is used as the lens holding member 32. Is added as a correction value when calculating the amount of movement in the yawing direction X.

  The control unit 63 outputs a correction signal based on the calculation result to the first and second drive drivers 64a and 64b while repeating these calculations. The first and second drive drivers 64a and 64b drive the first and second drive units 47 and 48 based on the correction signal, and the lens holding member 32 moves in the yawing direction X or the pitching direction Y. The lens holding member 32 is moved in a direction to cancel the positional deviation in the pitching direction Y or the yawing direction X that occurs when moving.

  As a result, the image shake correction mechanism 30 can appropriately move the lens holding member 32 to the target position while canceling the above-described crosstalk on the optical axis, and ensures good image shake correction performance. Is possible.

  The above-described crosstalk is caused by the operation of rotating the connecting member 33 in the yawing direction X with respect to the fixed member 31 and the operation of rotating the lens holding member 32 in the pitching direction Y with respect to the connecting member 33. It is. Therefore, since it is not caused by play or play, and individual differences are not so much as a problem, calibration of the Hall sensor as described in, for example, “JP 2008-191282 A” (prior art document) is performed. In the present invention, it is possible to cancel the crosstalk without performing (). Further, there is no need to provide storage means for storing error information as described in this prior art document.

  In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention. In the following description, portions equivalent to the image blur correction mechanism 30 are not described and are denoted by the same reference numerals in the drawings.

  In the image blur correction mechanism 30, the first and second shaft portions 36 and 38 are provided on the fixing member 31 and the lens holding member 32 side, and the first and second shaft holes 39 and 40 are provided on the connecting member 33 side. However, the present invention is not limited to such a configuration, and the first and second shaft holes 39.40 are provided on the fixing member 31 and the lens holding member 32 side, and the first is provided on the connecting member 33 side. The second shaft portions 36 and 38 may be provided.

  In the image blur correction mechanism 30, among the coils 49 a and 49 b and the magnets 50 a and 50 b constituting the first and second drive units 47 and 48, the coils 49 a and 49 b and the lens holding member 32 are arranged on the fixed member 31 side. Although the magnets 50a and 50b are arranged on the side, the configuration is not limited to this, and the magnets 50a and 50b are arranged on the fixed member 31 side, and the coils 49a and 49b are arranged on the lens holding member 32 side. It is also possible.

  The image blur correction mechanism 30 has a configuration in which the first drive unit 47 and the second drive unit 48 are arranged in the horizontal direction across the optical axis. For example, as shown in FIG. 7, the first drive unit 47 and the second drive unit 48 may be arranged side by side at an angle of 90 ° with the optical axis in between. In this case, it is possible to ensure good image blur correction performance while avoiding interference between the first drive unit 47 and the second drive unit 48.

  DESCRIPTION OF SYMBOLS 1 ... Imaging device 2 ... Lens barrel 30 ... Image blur correction mechanism 31 ... Fixing member (support part) 32 ... Lens holding member 33 ... Connecting member 36 ... 1st axial part 38 ... 2nd axial part 39 ... 1st Shaft hole 40 ... second shaft hole 47 ... first drive unit 48 ... second drive unit 61 ... first position detection unit 62 ... second position detection unit 63 ... control unit

Claims (2)

Of the plurality of lenses that form an image of the subject, a lens holding member that holds at least one lens is supported by a first direction and a second direction perpendicular to each other in a plane perpendicular to the optical axis. An image blur correction mechanism that corrects image blur by moving in the direction of
A connecting member for connecting the lens holding member and the support portion;
The first shaft portion provided in the other is engaged with the first shaft hole provided in one of the one end side of the connecting member and the lens holding member, thereby the first shaft portion. And the lens holding member is pivotally supported with respect to the connecting member,
When the second shaft portion provided on the other side is engaged with the second shaft hole provided on either the other end side of the connecting member or the support portion, the second shaft portion The connecting member is pivotally supported with respect to the support portion around
Furthermore, a first driving unit that generates a driving force that moves the lens holding member in the first direction, and a second driving unit that generates a driving force that moves the lens holding member in the second direction. And
The first drive unit and the second drive unit are arranged side by side in the first direction across the optical axis,
A rotation center of the lens holding member is arranged in the first direction together with the first and second driving units, and is located outside the first driving unit,
In a state in which the optical axes of the plurality of lenses coincide with each other, a straight line connecting the rotation center of the lens holding member and the lens center is parallel to the first direction, and the rotation of one end side and the other end side of the connection member is performed. A straight line connecting the moving centers is parallel to the second direction,
The first driving unit and the second driving unit include a coil provided on one of the lens holding member and the support and a magnet provided on the other, and energizes the coil. Driving force is generated by the magnetic action of the magnetic field generated by the magnetic field generated by the magnet facing the coil,
A plurality of balls interposed between said lens holding member and the support portion, said lens holding member with respect to the support part is supported movably in a plane perpendicular to the optical axis Rutotomoni, the lens Due to the magnetic attractive force generated between the magnet provided on the holding member side and the back yoke provided on the support portion side, the plurality of balls are placed between the support portion and the lens holding member. It is held in a sandwiched state,
Furthermore, a first position detector that detects a position of the lens holding member in the first direction, a second position detector that detects a position of the lens holding member in the second direction, and the first 1 and a control unit for controlling the driving of the second driving unit,
The control unit is generated when the lens holding member moves in the first or second direction based on position information of the lens holding member detected by the first and second position detection units. Further, a correction signal for moving the lens holding member in a direction for canceling the positional deviation in the second or the first direction is generated, and the first and second driving units are generated based on the correction signal. An image blur correction mechanism that controls driving . A plurality of lenses for forming an image of a subject;
A lens holding member that holds at least one lens among the plurality of lenses;
A lens barrel having a support portion for supporting the lens holding member and holding the plurality of lenses;
An image sensor that captures an image of a subject formed by the plurality of lenses;
An image blur correction mechanism that corrects image blur by moving the lens holding member in a plane perpendicular to the optical axis with respect to the support;
An image pickup apparatus comprising the image shake correction mechanism according to claim 1 as the image shake correction mechanism.

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