JP2014077926A - Image blur correction device, optical apparatus, and imaging apparatus - Google Patents

Abstract

In an image blur correction apparatus that moves a movable part that holds a correction member along a spherical surface having a predetermined point as a centroid, the entire apparatus reduces output fluctuation of propulsive force and suppresses decrease in driving efficiency. Downsizing.
An image shake correction apparatus 100 moves a movable lens barrel 103 along a spherical surface having a rotation center point O as a sphere center with respect to a fixed member 101, and corrects image shake by movement of a correction lens 102. . A first drive pin 1032 provided on the movable lens barrel 103 engages with a guide hole 1011 provided on the fixed member 101, and further engages with a cam groove 1041 provided on the first rotating member 104. The first rotating member 104 and the second rotating member 105 are supported so as to be rotatable with respect to the fixed member 101. The second driving pin 1051 provided on the second rotating member 105 is connected to the movable lens barrel 103, and the movable lens barrel 103 is centered on the first driving pin 1032 according to the rotation of the second rotating member 105. Moving.
[Selection] Figure 2

Description

  The present invention relates to an image shake correction apparatus mounted on an imaging apparatus such as a digital camera, an optical device such as a digital single lens reflex interchangeable lens, binoculars, and a telescope.

An image shake correction apparatus mounted on a digital camera or the like drives a movable barrel holding a correction member such as an optical member or an image sensor in two directions (yaw direction and pitch direction) in a plane orthogonal to the optical axis. This reduces the effects of camera shake that occurs during shooting.
Patent Document 1 discloses a configuration in which a movable lens barrel is driven using a voice coil motor. A configuration in which the movable lens barrel is driven in two directions on the spherical surface by arranging the two voice coil motors so that the driving force acts in the first direction and the second direction orthogonal to the optical axis and orthogonal to each other. Is realized. The movable lens barrel that holds the correction lens is driven in two directions on a spherical surface having a predetermined point as a sphere, thereby preventing a decrease in optical performance when the correction lens moves.

JP 2008-134329 A

  The image blur correction apparatus described in Patent Document 1 drives a movable barrel in two directions on a spherical surface by two voice coil motors. However, when the movable lens barrel is at one end of the movable region and when it is at the other end, the distance between the magnet and the coil constituting the voice coil motor varies greatly. Since the output of the voice coil motor strongly depends on the distance between the magnet and the coil, the output of the voice coil motor also changes greatly according to the position of the movable barrel. Therefore, in order to draw out sufficient driving force even when the output is the smallest, there is a problem that the voice coil motor is increased in size. Further, when the movable lens barrel is driven in the first direction by the first driving unit, the positional relationship between the magnets constituting the second driving unit also changes. Since the output of the voice coil motor depends on the area of the opposed surfaces of the magnet and the coil, there is a problem that the efficiency of the second drive unit is reduced by moving the movable barrel in the first direction. It was.

  An object of the present invention is to reduce an output fluctuation of a propulsive force and suppress a decrease in driving efficiency in an image shake correction apparatus that moves a movable portion that holds a correction member along a spherical surface having a predetermined point as a spherical center. However, it is to reduce the size of the entire apparatus.

  In order to solve the above problems, an apparatus according to the present invention corrects image blur by moving a movable portion that holds a correction member with respect to a fixed member along a spherical surface whose center is a rotation center point. An image shake correction apparatus, comprising: a first guide portion provided on the fixed member; an engaged portion provided on the movable portion that is engaged with the first guide portion; and the engaged portion. A first rotating member supported in a state capable of rotating with respect to the fixed member, supported in a state capable of rotating with respect to the fixed member, and A second rotating member that is connected to the movable part and moves the movable part around the engaged part; and a driving unit that drives the first and second rotating members, respectively.

  According to the present invention, it is possible to reduce the output fluctuation of the propulsive force in the image shake correction apparatus, and to reduce the size of the entire apparatus while suppressing a decrease in driving efficiency.

FIG. 8 is an exploded perspective view illustrating a configuration example of an image blur correction device in order to describe the embodiment of the present invention in conjunction with FIG. 2 to FIG. 7. It is sectional drawing at the time of cut | disconnecting an image shake correction apparatus by the plane containing an optical axis. It is sectional drawing at the time of cut | disconnecting an image shake correction apparatus by the plane containing an optical axis and a rolling member. It is the front view (A) and sectional drawing (B) of a 1st rotation member. It is sectional drawing of the image blur correction apparatus in a drive state. It is a graph which illustrates the locus | trajectory of the correction lens in a drive state. It is a figure which shows the structural example of an imaging device.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 7. The image shake correction apparatus according to the present embodiment is applied to an imaging apparatus such as a video camera, a digital camera, or a silver salt still camera, or an optical apparatus such as an interchangeable lens or lens barrel unit for a digital single lens reflex camera, a binocular, a telescope, or a field scope. It can be installed. Before describing the configuration of the image shake correction apparatus, an application example to the imaging apparatus will be described with reference to FIG.

  FIG. 7 shows a configuration example of the entire imaging apparatus according to the present embodiment. The zoom unit 201 constituting the imaging optical system performs a zooming operation by the zoom drive control unit 209. The aperture / shutter unit 202 includes an aperture device and a shutter device for adjusting the amount of light, and is driven and controlled by an aperture / shutter drive control unit 210. The correction lens unit 203 constitutes an image blur correction optical system and corrects image blur due to vibration such as camera shake. The image shake correction apparatus of this embodiment is applied to the correction lens unit 203. The correction lens drive control unit 211 controls driving of the correction lens unit 203. The focus unit 204 includes a focus lens that performs focus adjustment. The focus drive control unit 212 controls the drive of the focus unit 204. Each drive control unit controls the drive of the movable unit in charge of each according to a control command from the control unit 213.

  The imaging unit 205 uses an imaging element to convert an optical image formed through each lens group into an electrical signal by photoelectric conversion. The imaging signal processing unit 206 converts the output signal of the imaging unit 205 into a video signal. The video signal processing unit 207 performs image processing corresponding to the application on the output signal of the imaging signal processing unit 206. The display unit 208 displays an image according to the output signal of the video signal processing unit 207. Processing and operation of the imaging signal processing unit 206, the video signal processing unit 207, and the display unit 208 are controlled by the control unit 213. The storage unit 214 stores various data such as video information and control information. The control unit 213 that controls the entire system includes a processing device such as a CPU (Central Processing Unit) and executes a program read from the storage unit 214. The power supply unit 215 supplies a power supply voltage corresponding to the application to each unit constituting the camera system. The operation unit 216 is used when the user operates the camera, and outputs an operation instruction signal to the control unit 213. The operation unit 216 includes an operation member used for photographing operation and an operation member used for setting of image stabilization control. The control unit 213 performs image blur correction control of the subject image formed on the imaging surface of the image sensor based on the shake detection signal of the imaging device.

  Next, components of the image shake correction apparatus according to the present embodiment will be described with reference to FIGS. The image blur correction apparatus 100 performs drive control using the correction lens 102 as a correction member. The image blur correction apparatus 100 includes a fixed member 101, a movable lens barrel 103 that holds a correction lens 102, a plurality of rotating members 104 and 105, and driving units 106 and 107 thereof. Furthermore, a rolling member 108 (ball in this example), a tension spring 109, and a lid member 110 are provided.

  FIG. 1 is an exploded perspective view illustrating a configuration example of the image blur correction apparatus 100. FIG. 2 is a cross-sectional view of the image shake correction apparatus 100 taken along a plane that passes through the optical axis of the correction lens 102 and is parallel to the yaw direction. Of the two directions perpendicular to each other in a plane orthogonal to the optical axis of the correction lens 102, the first direction is the yaw direction and the second direction is the pitch direction. FIG. 3 is a cross-sectional view of the image blur correction apparatus 100 cut along a plane that passes through the optical axis of the correction lens 102 and passes through the center of the rolling member 108. FIG. 4 is a front view (A) of the first rotating member 104 and a cross-sectional view (B) when cut along a plane passing through the rotation axis (see line AA).

  The fixing member 101 is formed in a cylindrical shape with a bottom, and is fixed to the lens barrel together with other lens groups (see FIG. 7) constituting the imaging optical system. Since the movable lens barrel 103 is disposed in the opening 101a formed at the center of the fixed member 101, the movable range of the movable lens barrel 103 is limited. The fixing member 101 has a guide hole 1011 (first guide portion). The guide hole 1011 is a long hole formed along the yaw direction at a portion between the opening 101a and the outer peripheral wall of the fixing member 101, and the drive pin 1032 provided on the movable lens barrel 103 is engaged with the guide hole 1011. The drive pin is guided. The first driving pin 1032 is an engaged portion that receives a driving force from the first rotating member 104.

The fixing member 101 has a plurality of fixed side receiving portions 1012. There are as many fixed-side receiving portions 1012 as the number of rolling members 108, and in this embodiment, the fixed-side receiving portions 1012 are provided at three equal angular intervals around the central axis of the opening 101a. As shown in FIG. 3, the bottom surface of the fixed side receiving portion 1012 forms a part of a spherical surface. That is, this surface forms a part of a spherical surface with the rotation center point O located on the optical axis of the correction lens 102 as a sphere. Further, the inner side surface portion connected to the bottom surface of the fixed side receiving portion 1012 functions as a wall surface that defines the movable range of the rolling member 108, and prevents the rolling member 108 from falling off the fixed side receiving portion 1012.
The fixing member 101 includes a first bearing portion 1023 and a second bearing portion 1024 (see FIG. 3), and supports the first rotating member 104 and the second rotating member 105 so as to be rotatable. The rotation axes of the first rotation member 104 and the second rotation member 105 are coaxial with each other through the rotation center point O. The fixing member 101 is provided with a plurality of spring hooks, and one end of each tension spring 109 is fixed thereto.

  The correction lens 102 is a movable lens constituting a part of the imaging optical system, and is an optical member of the correction optical system that decenters the optical axis. The correction lens 102 is driven and controlled by a correction lens drive control unit 211 shown in FIG. As a result, an image blur correction operation for moving the optical image that has passed through the imaging optical system is performed, and the stability of the image on the imaging surface can be ensured.

  The movable lens barrel 103 is a movable part that holds the correction lens 102 in the central opening 103a. The movable barrel 103 includes three movable side receiving portions 1031 (see FIG. 3), which correspond to the fixed side receiving portions 1012, respectively. The bottom surface of the movable side receiving portion 1031 forms a part of a spherical surface with the rotation center point O located on the optical axis of the correction lens 102 as a centroid. The radius of this spherical surface is equal to a value obtained by adding the diameter of the rolling member 108 to the radius of the spherical surface forming the bottom surface of the fixed side receiving portion 1012. That is, the rolling member 108 is sandwiched between the corresponding movable side receiving portion 1031 and the fixed side receiving portion 1012. In addition, the movable lens barrel 103 is provided with three protrusions 103b and one protrusion 103c that protrude outward from the holding portion of the correction lens 102 and are curved. The radius of curvature of these protrusions is approximately equal to the radius of the spherical surface with the rotation center point O as the sphere. The three protrusions 103b are formed at a predetermined angular interval with the optical axis as the center, and a first drive pin 1032 (see FIG. 2) is formed on one of them. A protrusion 103c positioned between two protrusions excluding the protrusion 103b on which the first drive pin 1032 is formed has a hole or a cut along a direction substantially perpendicular to the optical axis of the correction lens 102. A notch is formed. In the present embodiment, a long hole 1033 is formed. The protrusion 103 c constitutes a connecting portion with the second rotating member 105.

The first drive pin 1032 is formed in a columnar shape, and its central axis is inclined with respect to the optical axis of the correction lens 102 by facing the direction passing through the rotation center point O. The first drive pin 1032 is inserted into a guide hole 1011 provided in the fixing member 101 and is further fitted into a cam groove 1041 provided in the first rotating member 104. A second drive pin 1051 provided on the second rotating member 105 is engaged with the long hole 1033 formed in the protrusion 103c.
The movable lens barrel 103 has a spring hooking portion on each protrusion 103b, and one end of the tension spring 109 is fixed thereto. The plurality of tension springs 109 are stretched between the movable lens barrel 103 and the fixed member 101.

The first rotating member 104 is a ring-shaped member, and the central opening is used as an optical path. The first rotating member 104 is supported so as to be rotatable around a rotation axis passing through the rotation center point O, with the inner peripheral surface being pivotally supported by the first bearing portion 1023. Further, a portion 104a protruding outward of the first rotating member 104 has an arcuate cam groove 1041 (second guide portion). 4A is a view of the first rotating member 104 as viewed from the optical axis direction, and FIG. 4B is a cross-sectional view of the first rotating member 104 cut along a plane orthogonal to the optical axis. is there. The center line of the cam groove 1041 always passes through the rotation center point O. For the cam groove 1041, the rotation angle of the first rotation member 104 is θy in FIG. 4A, and the angle formed by the optical axis and the center line of the cam groove 1041 is θx in FIG. 4B. Sometimes the following relationship holds.
[Formula 1]
θx = α × θy + β
Here, α is a proportional constant, and β represents an angle (see FIG. 2) formed by the first drive pin 1032 with respect to the optical axis in a reference state where the movable barrel 103 is located at the center of the movable range. .
Further, the first rotating member 104 is formed with a tooth portion 104b that protrudes outward from the outer peripheral portion at an angular interval of 90 ° around the optical axis from a portion 104a that protrudes outward. The tooth portion 104b meshes with the pinion gear 106a (see FIG. 1) of the first driving portion 106, and the rotational force is transmitted to the first rotating member 104.

  The second rotating member 105 is a ring-shaped member, and the central opening is used as an optical path. The second rotating member 105 is supported so as to be rotatable around a rotation axis passing through the rotation center point O, with the outer peripheral surface being pivotally supported by the second bearing portion 1024. The second rotating member 105 includes a notch 105a with respect to the portion 104a of the first rotating member 104, and a second drive pin 1051 on the opposite side across the optical axis. The second drive pin 1051 is erected on the side facing the first drive pin 1032 provided on the movable lens barrel 103 across the optical axis. The second drive pin 1051 fitted into the elongated hole 1033 of the movable lens barrel 103 through the elongated hole 1013 of the fixed member 101 has a columnar shape, and is configured such that its central axis passes through the rotation center point O. The second rotating member 105 has a tooth portion 105b that protrudes outward from the outer peripheral portion. The tooth portion 105 b meshes with the pinion gear 107 a (see FIG. 1) of the second drive portion 107, and the rotational force is transmitted to the second rotating member 105.

The first driving unit 106 is a motor that rotates the first rotating member 104, and the second driving unit 107 is a motor that rotates the second rotating member 105. These motors are attached to the fixing member 101. Pinion gears 106a and 107a are respectively attached to the motor shafts. For example, open loop control is possible by using a stepping motor.
In this embodiment, the rolling member 108 is a ball, and supports the movable barrel 103 by rolling with respect to the fixed member 101. The plurality of rolling members 108 are evenly arranged in the circumferential direction around the optical axis. The rolling member 108 is formed of a material having high hardness such as stainless steel or ceramic material in order to reduce rolling resistance and to manufacture with high processing accuracy. The plurality of tension springs 109 are disposed between the fixed member 101 and the movable lens barrel 103, and apply a biasing force in the tension direction. In the present embodiment, the three tension springs are equally arranged along the circumferential direction, but various elastic members may be used.

  The lid member 110 is formed in a disc shape and is connected to the fixing member 101. The lid member 110 sandwiches the first rotating member 104, the second rotating member 105, the first driving unit 107, and the second driving unit 107 together with the fixing member 101, and the internal components drop off when receiving an impact or the like. To avoid.

Next, the structure and operation of the image blur correction apparatus will be described with reference to FIGS.
First, the relationship between the movable lens barrel 103 and the fixed member 101 will be described. In the present embodiment, the three rolling members 108 are arranged so as to come into contact with the fixed side receiving portions 1012 provided on the fixed member 101, respectively. The rolling member 108 is also in contact with a movable side receiving portion 1031 provided in the movable lens barrel 103. At this time, a tensile force acts between the movable lens barrel 103 and the fixed member 101 by the tension spring 109. By this tensile force, the rolling member 108 is stably supported while being held between the movable barrel 103 and the fixed member 101. At this time, the contact surfaces of the rolling member 108 and the corresponding movable side receiving portion 1031 and fixed side receiving portion 1012 are each a part of a concentric spherical surface having the rotation center point O as a spherical center. The difference in radius between the contact surfaces is equal to the diameter of the rolling member 108. Accordingly, the bottom surfaces of the movable side receiving portion 1031 and the fixed side receiving portion 1012 are kept concentric regardless of the positions of the movable lens barrel 103 and the rolling member 108. In other words, the movable lens barrel 103 is supported so as to be movable on a spherical surface having the rotation center point O as a spherical center.

  The first drive pin 1032 provided in the movable barrel 103 is guided by a guide hole 1011 provided in the fixed member 101. For this reason, the movable lens barrel 103 can be translated with respect to the fixed member 101 in the direction guided by the guide hole 1011 and can be rotated about the first drive pin 1032 as a central axis. In order for the first drive pin 1032 to function as the rotation axis of the movable lens barrel 103, at least a part of the first drive pin 1032 is a surface having rotational symmetry such as a columnar shape, a conical shape, or a spherical shape. It needs to be shaped. In this case, the central axis of the first drive pin 1032 passes through the rotation center point O as described above. Therefore, even if the movable lens barrel 103 rotates about the first drive pin 1032 as a central axis, the concentric state between the movable side receiving portion 1031 and the fixed side receiving portion 1012 is not impaired. That is, since the central axis of the first drive pin 1032 passes through the rotation center point O, it is possible to prevent the movable lens barrel 103 supported so as to be movable along the spherical surface from being twisted.

Next, the relationship between the movable lens barrel 103, the first rotating member 104, and the second rotating member 105 will be described.
The position where the first drive pin 1032 is guided while being engaged with the guide hole 1011 is determined by the first drive pin 1032 being engaged with the cam groove 1041. That is, the position of the first drive pin 1032 is the intersection of the cam groove 1041 and the guide hole 1011 when viewed from the optical axis direction. When the position of the first rotating member 104 is determined, the position of the movable lens barrel 103 is determined. Will be decided.
Further, when the elongated hole 1033 formed in the protrusion 103c is engaged with the second drive pin 1051, the position of the movable barrel 103 in the angular direction (see FIG. 2) is determined. In order to smoothly engage the second drive pin 1051 and the elongated hole 1033 regardless of the position of the second rotation member 105, at least a part of the second drive pin 1051 is formed in a cylindrical shape or a conical shape. It is necessary to have a surface shape having rotational symmetry, such as a spherical shape.

As described above, when the positions of the first rotating member 104 and the second rotating member 105 in the rotation direction are determined, the position of the movable barrel 103 is uniquely determined.
Next, the operation of the correction lens 102 will be described. By rotating the first rotating member 104 and the second rotating member 105, the correction lens 102 can be moved to an arbitrary position on the spherical surface.
When the first driving unit 106 is driven, the first rotating member 104 is rotated by the driving force. As a result, the first drive pin 1032 moves in the guide direction of the guide hole 1011 by the cam groove 1041. The first drive pin 1032 is always guided to the intersection of the cam groove 1041 and the guide hole 1011 when viewed from the optical axis direction.

  The shape of the cam groove 1041 is represented by “θx = α × θy + β” as shown in Equation 1, and the depth direction of the groove always faces the direction of the rotation center point O. The rotation center axis of the first rotation member 104 passes through the rotation center point O. Therefore, the central axis of the cam groove 1041 always passes through the rotation center point O at the intersection of the cam groove 1041 and the guide hole 1011 when viewed from the optical axis direction regardless of the position of the first rotation member 104. Therefore, the first drive pin 1032 and the cam groove 1041 are always parallel and stably maintain a line contact state. Thereby, since the pressure concerning a contact part can be made small, the abrasion which generate | occur | produces at the time of sliding can be reduced and the deformation | transformation of the drive pin 1032 can be avoided. No twisting occurs between the first drive pin 1032 and the cam groove 1041, and the concentric state of the movable side receiving portion 1031 and the fixed side receiving portion 1012 can be maintained. As a result, the movable lens barrel 103 can be rotated around a rotation axis that passes through the rotation center point O and is perpendicular to the direction in which the guide hole 1011 is formed.

FIG. 5 is a cross-sectional view of the first rotating member 104 rotated and cut along the same plane as FIG. 2 in a state where the movable lens barrel 103 is moved. The movable lens barrel 103 has moved in the direction of arrow A in FIG. 5 from the state of FIG. 2, and no twist has occurred between the first drive pin 1032 and the cam groove 1041 or the guide hole 1011.
When the second driving unit 107 is driven and the second rotating member 105 rotates, the second driving pin 1051 receives an acting force through the elongated hole 1033 of the protrusion 103c, and the movable lens barrel 103 is moved to the first driving member 105. The drive pin 1032 rotates around the rotation axis. As described above, since the central axis of the first drive pin 1032 always passes through the rotation center point O, the movable side receiving portion 1031 and the fixed side receiving portion 1012 are concentric even when rotated about this axis. Can keep. The rotation axis of the second rotation member 105 passes through the rotation center point O, and the center axis of the second drive pin 1051 also passes through the rotation center point O. Regardless of the rotational position of the second rotating member 105, the central axis of the second drive pin 1051 is always in a state of passing through the rotational center point O. Accordingly, no twisting occurs between the second drive pin 1051 and the elongated hole 1033, and the movable lens barrel 103 can rotate smoothly around the first drive pin 1032. Since there is a distance between the first drive pin 1032 and the center of the optical axis of the correction lens 102, the center point of the correction lens 102 can be moved by this rotation.

As described above, by combining the rotation of the first rotation member 104 and the rotation of the second rotation member 105, the correction lens 102 is moved to an arbitrary position on the spherical surface with the rotation center point O as a sphere. be able to.
FIG. 6 is a graph plotting the movement locus of the correction lens 102 as an example of driving the correction lens 102. The several locus | trajectory at the time of rotating the 2nd rotation member 105 in the state which the 1st rotation member 104 stopped is illustrated. The vertical axis direction represents the yaw direction (corresponding to the guide direction of the guide hole 1011), the horizontal direction represents the pitch direction, and numerical values are shown in arbitrary units. A dotted circle indicates the boundary of the movable range of the movable lens barrel 103. It can be seen that the correction lens 102 can be positioned at an arbitrary point within the movable range by the rotation of the rotating members 104 and 105.

According to the present embodiment, the following effects can be obtained.
The movable barrel 103 can be moved to an arbitrary position on the spherical surface by combining the rotational movements of the first rotating member 104 and the second rotating member 105.
Since each rotary member can be driven by a rotary drive unit such as a stepping motor, the output of the drive unit does not change depending on the position of the movable lens barrel 103. Accordingly, even with a drive unit having a small output, the movable lens barrel 103 can be stably driven over the entire movable range, which contributes to downsizing and cost reduction of the drive unit and downsizing of the entire apparatus.

The operation of the drive parts of the rotating members 104 and 105 can be performed independently.
Even if the first rotating member 104 is rotated, the second rotating member 105 does not rotate. Conversely, even if the second rotating member 105 is rotated, the first rotating member 104 rotates. There is no. That is, for this reason, even if one drive unit is driven, the efficiency of the other drive unit is not lowered, and the drive unit can be highly efficient.

Regardless of the position of the movable lens barrel 103, it is possible to prevent twisting from occurring between the first drive pin 1032 and the cam groove 1041 or between the second drive pin 1051 and the long hole 1033. .
In the present embodiment, the center axis of the first drive pin 1032 and the rotation axis of the first rotating member 104 are configured to pass through the rotation center point O, respectively. As a result, the central axis of the first drive pin 1032 always passes through the rotation center point O regardless of the rotation position of the first rotation member 104. Further, the center axis of the second drive pin 1051 and the rotation axis of the second rotation member 105 are configured to pass through the rotation center point O, respectively. Accordingly, the central axis of the second drive pin 1051 always passes through the rotation center point O regardless of the rotation position of the second rotation member 105.

  Note that the central axes of the first drive pin 1032 and the second drive pin 1051 pass through the rotation center point O due to ensuring assemblability and restrictions on the mold structure when each member is formed by resin molding. It may be difficult to achieve accuracy. Even in such a case, the central axis is such that the intersection of the central axis of each of the first drive pin 1032 and the second drive pin 1051 and the optical axis is the direction in which the rotation center point O exists when viewed from the correction lens 102. By tilting, the occurrence of twisting can be suppressed. Furthermore, when the movable range of the movable lens barrel 103 is small, or when the distance from the rotation center point O to the ball receiving portion is sufficiently large, the first drive pin 1032 or the second drive pin 1051 is used as the optical axis. Even if they are formed parallel to each other, the amount of twisting is reduced. If this value is sufficiently small relative to general tolerances and the amount of deformation of the drive pin, each drive pin can be formed parallel to the optical axis, ensuring assembly and simplifying the mold structure during manufacturing. Can be achieved. Alternatively, by adopting a structure in which the first drive pin 1032 can be deformed with respect to the movable lens barrel 103, it is possible to reduce the influence caused by the twisting.

-Due to the shape design of the cam groove 1041 (see FIG. 4 and Equation 1), no twisting occurs between the cam groove 1041 and the first drive pin 1032 regardless of the position of the first rotating member 104.
-The image stabilizer must not be enlarged.
In the present embodiment, since the central axes of the first rotating member 104 and the second rotating member 105 are arranged coaxially and the dead space can be reduced, an increase in the size of the apparatus can be prevented. Further, the rotation axes of the two rotating members are configured to pass through the rotation center point O of the movable lens barrel 103, so that the occurrence of interference when the rotating members and the movable lens barrel 103 rotate can be avoided.

  As described above, the present embodiment has a configuration in which the movable barrel is driven in two directions on a spherical surface having a predetermined point as a sphere by rotating the first and second rotating members. A rotary motor such as a stepping motor can be used for the drive unit, and the fluctuation of the propulsive force accompanying the change in the position of the movable lens barrel is small. Further, since the two rotating members are driven independently, a decrease in driving efficiency due to a change in the mutual driving position is small. Therefore, it is not necessary to compensate for the lack of propulsive force by increasing the size of the drive unit, and the entire apparatus can be reduced in size.

[Other Embodiments]
In the above-described embodiment, a rolling member is disposed between two concentric spherical surfaces (see FIG. 3), and the movable lens barrel is supported so as to be movable on a spherical surface having the rotation center point O as a spherical center. The configuration to be described was explained. The support structure is not limited to this. It is possible to use a support structure or the like in which the spherical surface portion provided on the movable barrel without using the rolling member and the spherical surface portion provided on the fixed member are slidably opposed to each other.
Moreover, in the said embodiment, although the cam groove 1041 was made into the shape represented by the said Numerical formula 1, the angle of the depth direction of the cam groove 1041 changes continuously in this case. For this reason, when creating the 1st rotation member 104 by resin molding, there exists a possibility of causing complication of a metal mold | die. When the rotation angle of the movable lens barrel 103 is sufficiently small with respect to the amount of deformation in the angular direction expected for the first drive pin 1032 during driving, the angle change in the depth direction of the cam groove 1041 is ignored and constant. Can be considered. When this condition is satisfied, the cam groove 1041 can be easily formed by making the angle in the depth direction of the cam groove 1041 constant.

  The first and second drive units are not limited to stepping motors, and DC (direct current) motors and voice coil motors that can rotate the first and second rotating members can be used. In order to achieve the purpose of manufacturing cost and accuracy, an appropriate type can be selected from various motors, so the degree of freedom in design is high. Further, the correction member (image blur correction optical member) held by the movable lens barrel is not limited to the correction lens, and may be an image sensor, a prism, or the like.

DESCRIPTION OF SYMBOLS 101 Fixed member 102 Correction | amendment lens 103 Movable lens barrel 104 1st rotation member 105 2nd rotation member 106 1st drive part 107 2nd drive part

Claims (11)

An image shake correction apparatus that corrects image shake by moving a movable portion that holds a correction member with respect to a fixed member along a spherical surface having a rotation center point as a sphere center,
A first guide provided on the fixing member;
An engaged portion provided on the movable portion, which is engaged with the first guide portion;
A first rotating member having a second guiding portion for guiding the engaged portion, and supported in a state of being rotatable with respect to the fixed member;
A second rotating member that is supported in a state where it can rotate with respect to the fixed member, and that is connected to the movable part and moves the movable part around the engaged part;
An image blur correction apparatus comprising driving means for driving each of the first and second rotating members.   The image blur correction apparatus according to claim 1, wherein the first rotation member is driven by the driving unit about a rotation axis passing through the rotation center point.   The first guide part has a guide hole, and the engaged part is a first drive pin that is inserted through the guide hole and guided by the second guide part. The image blur correction apparatus according to 1 or 2.   4. The image blur according to claim 3, wherein an intersection between a center axis of the first drive pin and a rotation axis of the rotation member and the rotation center point are located on the same side with respect to the correction member. Correction device.   5. The image blur correction according to claim 4, wherein the first drive pin is engaged with the second guide portion in a state in which a center axis thereof faces a direction passing through the rotation center point. 6. apparatus.   6. The image blur correction apparatus according to claim 1, wherein the second rotation member is driven by the driving unit about a rotation axis passing through the rotation center point. 6. The second rotating member has a second drive pin that constitutes a connecting portion with the movable portion,
The said 2nd drive pin is connected with the said movable part in the state which the center axis turned to the direction which passes the said rotation center point, The one of Claim 1 to 6 characterized by the above-mentioned. Image shake correction device. The movable part is supported by the fixed member via a rolling member,
The image blur correction apparatus according to claim 7, wherein the movable portion is formed with a hole portion or a notch portion that engages with the second drive pin.   9. The image blur correction apparatus according to claim 1, wherein a rotation axis of the first rotation member and a rotation axis of the second rotation member are coaxial. 10.   An optical apparatus comprising the image blur correction device according to claim 1. An image pickup apparatus comprising the image shake correction apparatus according to claim 1.

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