JP2013125228A5 - - Google Patents

Description

Image shake correction apparatus, optical apparatus including the same, and imaging apparatus

The present invention relates to an image shake correction apparatus, an optical apparatus including the same, and an imaging apparatus.

There has been proposed an imaging apparatus including an image blur correction apparatus that prevents image blur due to camera shake that is likely to occur during handheld shooting. Patent Document 1 discloses an imaging apparatus that integrally configures an image blur correction device and a light amount regulation driving unit. An image blur correction device included in an imaging device disclosed in Patent Document 1 includes a driving magnet that can be displaced integrally with a correction lens, and a coil that displaces the driving magnet by electromagnetic force. In this image shake correction apparatus, a microcomputer, a coil, and a hall element constitute a feedback system, and the shake correction is performed by repeating energization to the coil while calculating the position of the correction lens holder after energization of the coil at a constant period. . The correction lens is in pressure contact with a base, which is a fixed portion, via a rolling ball.

  Further, Patent Document 2 discloses a camera shake correction device that detects a camera shake amount and performs rotation / linear control of a movable part included in an XY movable stage according to the detected camera shake amount. This camera shake correction device includes four ball bearings for keeping the distance between the movable portion and the fixed portion provided in the XY movable stage constant. The camera shake correction apparatus includes a plurality of electromagnetic actuators that are driven in the X direction or the Y direction.

JP 2007-219338 A JP 2007-232980 A

However, in the image blur correction apparatus disclosed in Patent Document 1, if the electromagnetic actuator (magnet 21a and coil 22a) is enlarged to increase the output (torque), it is possible to secure a ball receiving surface that supports the movable part. It becomes difficult. That is, in the image shake correction apparatus disclosed in Patent Document 1, it is necessary to secure a ball receiving surface, and thus the output of the electromagnetic actuator cannot be increased.

  In addition, in the camera shake correction device disclosed in Patent Document 2, four ball bearings are arranged at a place avoiding the electromagnetic actuator. That is, this camera shake correction device is supported at four points. However, geometrically, the plane is defined by three points, and the fourth point is a point that does not actually contact unless it is constructed with a very high accuracy. If a position error of 4 points occurs, the 4th point may or may not be touched. Therefore, since the camera shake correction apparatus disclosed in Patent Document 2 is supported at four points, the movement is distorted each time the movable part is driven.

  In addition, since the camera shake correction apparatus disclosed in Patent Document 2 is provided with a plurality of electromagnetic actuators, the following problems arise when attempting to support the camera shake correction apparatus at three points at a position avoiding the electromagnetic actuator. That is, the support position can be provided only at an unbalanced position with respect to the center of gravity of the movable part, or the support position must be disposed outside or inside the electromagnetic actuator. As a result, the entire apparatus becomes large.

It is an object of the present invention to provide an image blur correction apparatus that can increase the output of an actuator while suppressing the radial size from the center of the movable part, and can stably move and support the movable part with respect to the fixed part. To do.

The image blur correction apparatus of the present embodiment holds a correction member that corrects image blur , a base member, and the correction member, and is relatively relative to a predetermined direction perpendicular to the optical axis with respect to the base member. A movable member provided movably, a first drive device that moves the movable member in a first direction, a second drive device that moves the movable member in a second direction, and the movable member And three support portions for supporting the base member. At least one of the three support portions is provided at a position overlapping the first drive device or the second drive device when viewed from the optical axis direction.

According to the image blur correction device of the present invention, the output of the electromagnetic actuator can be increased while suppressing the size in the radial direction from the center of the movable part, and the movable part can be stably moved and supported with respect to the fixed part. Can do.

It is a figure which shows the structural example of the imaging device of this embodiment. FIG. 3 is an exploded perspective view of an image shake correction unit. It is a top view of the base member of the image blur correction unit. FIG. 4 is a cross-sectional view of the image shake correction unit shown in FIG. 3 at the AA position. It is a top view showing a base member and other parts typically. It is a top view of a drive coil. FIG. 6 is a schematic top view of a base member provided in an image shake correction apparatus according to Embodiment 2. FIG. 6 is a schematic top view of a base member included in an image shake correction apparatus according to Embodiment 3.

  FIG. 1 is a diagram illustrating a configuration example of an imaging apparatus according to the present embodiment. In the following description, a plane perpendicular to the optical axis on which the movable part can move is defined as an X and Y plane. The optical axis is the Z direction.

The imaging apparatus shown in FIG. 1 is a camera having a lens barrel 10 and a camera body 20. The lens barrel 10 includes an image shake correction unit 11 and a drive control unit 12. The camera body 20 includes an image sensor 21. The image blur correction unit 11 performs image blur correction by shifting the correction lens L1 in a plane perpendicular to the optical axis O. In the present embodiment, the correction lens L1 functions as a correction member that corrects image blur . The lens barrel 10 has a lens group that forms an optical system together with the correction lens L1.

  The image sensor 21 is an image sensor that captures an image of a subject obtained by the optical system of the lens barrel 10. The imaging device 21 includes a charge coupled device (CCD) image sensor and a complementary metal oxide semiconductor (CMOS) image sensor.

FIG. 2 is an exploded perspective view of the image blur correction unit. FIG. 3 is a top view of the base member of the image blur correction unit. In FIG. 3, parts other than the base member 1 are schematically shown as necessary. 4 is a cross-sectional view of the image blur correction unit shown in FIG. 5A and 5B are top views schematically showing the base member and other components.

The image blur correction unit 11 corrects image blur caused by camera shake or the like by moving the correction lens L1 in the first direction and the second direction within a plane perpendicular to the optical axis O. The first direction (hereinafter referred to as X direction) and the second direction (hereinafter referred to as Y direction) are directions orthogonal to each other.

The image blur correction unit 11 includes a first drive unit group having two first drive coils 2a and 2b (see FIG. 3) that drive the correction lens L1 in the X direction (first direction). The first drive coils 2a and 2b are two drive devices provided at positions facing each other across the correction lens L1. Further, the image blur correction unit 11 includes a second drive unit group having two second drive coils 3a and 3b that drive the correction lens L1 in the Y direction (second direction). The second drive coils 3a and 3b are also two drive devices provided at positions facing each other across the correction lens L1. The first driving device group and the second driving device group are driven and controlled independently of each other.

In addition to the correction lens L1, the image blur correction unit 11 includes a base member 1, first drive coils 2a and 2b, second drive coils 3a and 3b, a lens holder 4, balls 5a to c, tension springs 6a to c, and a sensor. A holder 7 and Hall elements 8a and 8b are provided. The first drive coils 2a and 2b are also described as the first drive coil 2. The second drive coils 3a and 3b are also described as the second drive coil 3. The balls 5a to 5c are ball members and are also described as balls 5. The tension springs 6a to 6c are also described as the tension spring 6.

  The base member 1 is provided so as to be movable along the optical axis O in conjunction with another lens group (not shown). The base member 1 has three followers 1a on the outer periphery. The follower 1a engages with a cam groove provided in a cam cylinder (not shown), and can move along the optical axis O along the cam groove.

  Furthermore, the base member 1 is provided with coil holding frames 1b, 1c, 1d, and 1e for holding drive coils described later. The drive coil is fixed by the coil holding frame. In addition, the base member 1 is provided with ball receiving surfaces 1f, 1g, and 1h that serve as ball rolling surfaces described later.

  In addition, the base member 1 is provided with a hook-shaped first locking portion 1i, a second locking portion 1j, and a third locking portion 1k that lock three biasing members described later. Each locking portion locks a tension spring 6 described later.

  The first drive coils 2a and 2b are held by two coil holding frames 1b and 1c provided on the base member 1 in the first direction (X direction). The second drive coils 3a and 3b are held by two coil holding frames 1d and 1e provided on the base member 1 in the second direction (Y direction).

  The lens holder 4 is a movable member that holds the correction lens L1 and is movable relative to the base member 1 in a direction orthogonal to the optical axis O. The lens holder 4 holds the correction lens L1 in a lens holding portion 4a provided at the center. On the outer periphery of the correction lens L1, a first magnet 4b and a second magnet 4c, which are magnetic members magnetized in two poles, are integrally formed on the X axis. The second magnet 4c is arranged so as to sandwich the optical axis O with respect to the first magnet 4b.

  Further, on the outer periphery of the correction lens L1, the third magnet 4d and the fourth magnet 4e magnetized in two poles are integrally formed on the Y axis. The fourth magnet 4e is disposed so as to sandwich the optical axis O with respect to the third magnet 4d. The first magnets 4b and 4c are opposed to the first drive coils 2a and 2b. The second magnets 4d and 4e face the second drive coils 3a and 3b.

  When a current is passed through the first drive coils 2a and 2b, a magnetic force is generated, and the magnet receives a repulsive force or an attractive force due to the relationship between the magnetic force and the magnetic force of the first magnet 4b and the second magnet 4c. Thereby, the first magnet 4b and the second magnet 4c receive the driving force in the X direction, and the lens holder 4 can be translated in the X direction. The magnitudes of the currents flowing through the first coils 2a and 2b may be the same or different.

  Similarly, when a current is passed through the second coils 3a and 3b, a magnetic force is generated, and the magnet receives a repulsive force or an attractive force due to the relationship between the magnetic force and the magnetic force of the third magnet 4d and the fourth magnet 4e. As a result, the third magnet 4d and the fourth magnet 4e receive a driving force in the Y direction, and the lens holder 4 can be translated in the Y direction. The magnitudes of the currents flowing through the second coils 3a and 3b may be the same or different.

  Ball holding frames 4f, 4g, and 4h are provided at positions facing the ball receiving surfaces 1f, 1g, and 1h of the base member 1. The ball 5 slides within the ball holding frame. The ball holding frame is also a receiving surface of the ball 5 in the optical axis direction. In addition, the base member 1 includes a first locking portion 4 i, a second locking portion 4 j, and a third locking portion 4 k each having a hook shape that locks the tension spring 6.

  The three balls 5 a to 5 c are arranged so as to be sandwiched between the base member 1 and the lens holder 4. FIG. 4 shows the ball 5a. The balls 5b and 5c are also sandwiched between the base member 1 and the lens holder 4 with the same structure.

  As shown in FIG. 4, the ball 5a is sandwiched in the optical axis direction between the ball receiving surface 1f of the base member 1 and the flat portion in the ball receiving frame 4f of the lens holder 4 having a concave shape. The lens holder 4 is held movably with respect to the base member 1 by rolling friction caused by balls. That is, the ball and the ball receiving surface function as three support portions that support the lens holder 4 with respect to the base member 1. The ball receiving surface functions as a sliding surface on which the ball 5 slides. The ball 5 a rolls with the movement of the lens holder 4, and the rolling range is regulated by the outer wall (regulation wall) of the ball receiving frame 4 f of the lens holder 4. That is, a regulating wall that regulates the movement of the ball 5 in the sliding surface is provided on the outer peripheral portion of the sliding surface. The size of the ball receiving surface 1f of the base member 1 is greater than or equal to the range where the ball 5a contacts within the rolling range. The reason why the outer wall is provided not on the ball receiving surface 1f side of the base member 1 but on the lens holder 4 side will be described later.

  The tension spring 6 functions as a biasing unit that biases the base member 1 and the lens holder 4 in a direction in which the ball 5 is sandwiched, that is, in a direction parallel to the optical axis O. Specifically, the ends of the tension springs 6a, 6b, and 6c are respectively connected to the locking portions 1i, 1j, and 1k provided on the base member 1 and the locking portions 4i, 4j, and 4k provided on the lens holder 4. It is energized by hooking the department. Further, the center position of the resultant force by the three tension springs 6 is in an arrangement relationship such that it is in a triangle T1 (described later) formed by connecting three ball receiving surfaces.

  The sensor holder 7 (see FIG. 1) is a component that holds the Hall element 8 and is fixed to the base member 1. The Hall element 8 is a magnetic sensor that detects magnetism. The first Hall element 8a shown in FIG. 2 is installed at a position facing the first magnet 4a formed on the lens holder 4 with a predetermined interval. The first Hall element 8a detects a change in magnetic force caused by the movement of the first magnet 4b along with the movement of the lens holder 4, and detects the position of the lens holder 4 in the X direction.

  The second Hall element 8b is installed at a position facing the fourth magnet 4e formed on the lens holder 4 with a predetermined interval. The second Hall element 8b detects a change in magnetic force caused by the movement of the fourth magnet 4e with the movement of the lens holder 4, detects the position of the lens holder 4 in the Y direction, and outputs it to the drive control unit 12. ing.

When performing the image blur correction operation, the drive control unit 12 calculates the position of the correction lens L1 based on a signal output from the Hall element 8. Then, the drive control unit 12 calculates the drive amount of the correction lens L1 based on the calculated position of the correction lens L1 and shake information obtained from a shake sensor (not shown), and sets the drive current to the first drive coil 2 and Supply to the second drive coil 3.

At the start of photographing, first, the drive control unit 12 performs a centering operation for moving the correction lens L1 to the initial position. The initial position is a position where the optical axis of the correction lens L1 coincides with the optical axes of other lens groups forming the optical system. By performing this centering operation, the range in which the correction lens L1 can be moved in the image shake correction operation during shooting becomes substantially equal in all directions, and the image shake correction operation effective for any shake during shooting. Can be done. When the image blur correction operation is not performed, shooting is performed with the correction lens L1 kept at the initial position.

  Next, the arrangement position of the ball receiving surfaces 1f, 1g, and 1h of the ball 5 provided on the base member 1 and the reason why the lens holder 4 is provided with a restriction wall that restricts the rolling of the ball member 5 will be described with reference to FIG. This will be described in detail with reference to FIG.

FIG. 3 is a schematic top view of a base member included in the image shake correction apparatus according to the first embodiment. In the first embodiment, as shown in FIG. 4, the ball receiving surface 1f is disposed at a position where a part of the ball receiving surface 1f overlaps the second drive coil 3a when viewed from the optical axis direction. Similarly, the ball receiving surface 1g is arranged at a position where a part of the ball receiving surface 1g overlaps with the first drive coil 2b when viewed from the optical axis direction.

A triangle T1 shown in FIG. 3 is a triangle formed by connecting the centers of the ball receiving surfaces 1f, 1g, and 1h. Point G is the position of the center of gravity when the lens holder 4 is in the initial position. S <b> 1 is a range where the center of gravity G of the lens holder 4 is within the movable range of the lens holder 4. In this example, the first drive coil 2 and the second drive coil 3 are arranged outside the diameter D1 with the optical axis O as the center and inside the diameter D2. The diameter D1 is, for example, the diameter of an opening provided in the base member 1 around the optical axis O, which is necessary for the lens holder 4 to move relative to the base member 1. The diameter D2 is, for example, the outer diameter of the base member 1 or the outer diameter of the image blur correction unit 11. In this example, the ball receiving surfaces 1f, 1g, and 1h that function as the three support portions are also arranged outside the diameter D1 and inside the diameter D2. In order to reduce the size of the image blur correction unit, it is preferable that the diameter D2 can be configured as small as possible.

  In the first embodiment, the positions of the ball receiving surfaces 1f, 1g, and 1h are determined so that the range S1 is within the triangle T1 shown in FIG. That is, the center of gravity G of the lens holder 4 is included in a triangle connecting the three support portions that support the base member 1. Thereby, the lens holder 4 can move stably with respect to the base member 1 (fixed part).

  Here, the position of the ball receiving surface shown in FIG. In FIG. 5A, the base member 1 is expressed as 201, and the ball receiving surfaces are expressed as 201f, 201g, and 201h, respectively. If the ball receiving surfaces 101f, 101g, and 101h are provided at positions that do not overlap the coil in the optical axis direction, the range S1 protrudes from the triangle T2 formed by connecting the three ball receiving surfaces 201f, 201g, and 201h. Become. This indicates that when the lens holder 4 is movable and is in a position protruding from the triangle T2, the lens holder 4 is not stably supported and the lens holder may be inclined, which is not preferable.

Also, assume the position of the ball receiving surface shown in FIG. In FIG. 5B, a part corresponding to the base member 1 is represented as a base member 201 ′, and each of the ball receiving surfaces is represented as 201 ′ f, 201 ′ g, and 201 ′ h. In the example shown in FIG. 5B, the ball receiving surfaces 201′f to 201′h are provided at positions that do not overlap the drive coils 2 and 3 and are adjacent to each other in the radial direction. The range S1 can be formed without protruding from the triangle T2 ′ formed by connecting the three ball receiving surfaces 201′f, 201′g, and 201′h. However, in the base member 201 ′ shown in FIG. 5B, since the ball receiving surface is extended in the radial direction, the image blur correction unit is enlarged.

In the first embodiment, the ball receiving surface is arranged at the position described with reference to FIGS. 3 and 4. That is, at least one of the three ball receiving surfaces is viewed from the direction of the optical axis O and the first driving coil 2 included in the first driving device group or the second driving coil 3 included in the second driving device group. Are provided at the overlapping positions. As a result, the image blur correction unit 11 can be reduced in size, and the movable lens holder 4 can be stably held. In addition, since the ball receiving surface overlaps with the drive coil when viewed from the optical axis direction, the size of the drive coil can be ensured, and a sufficiently large actuator output can be obtained.

  Furthermore, in Example 1, the region where the ball receiving surface overlaps the drive coil in the optical axis direction is a region other than the region where magnetic force is generated in the magnet drive direction when the drive coil is energized.

  FIG. 6 is a top view of the drive coil. A is an area of the coil that generates a magnetic force exerting a driving force with respect to the driving direction F of the magnet. The magnet of the lens holder 4 is sized to face the region A so that a driving force can be obtained efficiently. In the present embodiment, the ball receiving surface is installed in a region avoiding the region A in FIG. 6, and the ball receiving surface can be installed without sacrificing the size of the drive magnet.

  Next, the reason why the restriction wall that restricts the rolling range of the ball member 5 is provided on the lens holder 4 side will be described. The regulation wall needs the thickness of the wall at the outer peripheral portion of the ball rolling portion. That is, the size required in the plane direction orthogonal to the optical axes of 4f, 4g, and 4h provided with the restriction walls is larger than that of the ball receiving surfaces 1f, 1g, and 1h.

  In this embodiment, the size of the drive coil is larger than the size of the magnet corresponding to the drive coil (the same applies to other embodiments). Therefore, the component side where the magnet is arranged, that is, the component side where the magnet is arranged, that is, the lens holder 4, can easily secure a usable space other than the magnet. For this reason, in this embodiment, the restriction wall of the ball member 5 that requires a larger space is provided in the lens holder 4. That is, the regulation wall is provided on the movable member on which the magnetic member is disposed. Thereby, the design freedom of a ball receiving surface can be increased or it can contribute to size reduction.

  Further, in this embodiment, the ball receiving surface is arranged so that the biasing force center position of the three tension springs 6 is inside the triangle T1. Accordingly, the lens holder 4 can be supported and moved more stably with respect to the base member 1.

FIG. 7 is a schematic top view of a base member included in the image shake correction apparatus according to the second embodiment. In Embodiment 2, the image blur correction unit includes one drive coil in each of the X direction and the Y direction. That is, the image blur correction unit includes a total of two actuators. Compared to the configuration of the first embodiment described with reference to FIG. 3, the size of the actuator is increased. However, in the second embodiment, the actuator does not spread over the entire outer peripheral portion of the correction lens, and can be integrated into a part. For this reason, there is an advantage that a lens barrel component other than the image blur correction unit can be arranged on the outer peripheral portion of the correction lens L1 .

  Members other than those shown in FIG. 7 are the same as those described in the description of the first embodiment. The same reference numerals as those in the first embodiment are used as they are, and the reference numerals corresponding to those in the first embodiment are used for those changed from the first embodiment. For example, the code corresponding to 1a in the first embodiment is 301a in the second embodiment. As for the component parts, the number of actuators has been reduced from two to one. The mechanism and other components are the same as those in the first embodiment. I will omit the explanation.

  The first coil 302a and the magnet corresponding to the first coil 302a function as a first driving device. The first driving device drives the lens holder 4 in the X direction. The second coil 303a and the magnet corresponding to the second coil 303a function as a second drive device. The second driving device drives the lens holder 4 in the Y direction. The first coil 302a and the second coil 303a are provided at positions facing each other with any one of the three support portions interposed therebetween. In this example, the first coil 302a and the second coil 303a are provided at positions facing each other across the ball receiving surface 301h.

  Further, the thrust center vector Fx1 by the first coil 302a and the thrust center vector Fy1 by the second coil 303a do not pass through the optical axis O. That is, in the second embodiment, the positional relationship between the first coil and the second coil is closer to each other than the positional relationship between the first coil and the second coil in the first embodiment. Thereby, the area (area indicated by B in FIG. 7) necessary for arranging the two actuators can be reduced while increasing the size (output) per actuator as much as possible.

Further, in this embodiment, the positional relationship is such that the driving coil and the ball receiving surface are overlapped when viewed from the optical axis direction (see FIG. 4). That is, at least one of the three ball receiving surfaces 301f to 301h (in the example shown in FIG. 7, the ball receiving surface 301h) is positioned so as to overlap with the first coil 302a or the second coil 303a when viewed from the optical axis direction. Is provided. Specifically, the ball receiving surface 301h is provided at a position overlapping the first coil 302a and the second coil 303a when viewed from the optical axis direction. Thereby, the first coil and the second coil can be brought close to each other, and the image blur correction unit can be downsized.

  In the present embodiment, the positions of the ball receiving surfaces 301f, 301g, and 301h are determined so that the range S1 is within the triangle T3 shown in FIG. That is, the center of gravity G of the lens holder 4 is included in a triangle connecting the three support portions that support the base member 1. Thereby, the lens holder 4 can move stably with respect to the base member 301 (fixed part).

The arrangement positions of the ball receiving surfaces 301f, 301g, and 301h are not limited to the arrangement positions shown in FIG. Two of the three ball receiving surfaces may overlap the drive coil. According to the image blur correction device of the second embodiment, the ball receiving surface capable of stably holding the lens holder is provided while the size of the driving device can be maximized in the image blur correction device. can do.

FIG. 8 is a schematic top view of a base member included in the image shake correction apparatus according to the third embodiment. In the third embodiment, as in the second embodiment, the image shake correction apparatus includes one drive coil in each of the X direction and the Y direction. Compared with the configuration of the first embodiment described with reference to FIG. However, in the third embodiment, the actuator portion does not spread over the entire outer peripheral portion of the correction lens, and can be integrated into a part. For this reason, there is an advantage that a lens barrel component other than the image blur correction device can be arranged on the outer peripheral portion of the correction lens L1.

  Members other than those shown in FIG. 8 are the same as those described in the description of the first embodiment. The same reference numerals as those in the first embodiment are used as they are, and the reference numerals corresponding to those in the first embodiment are used for those changed from the first embodiment. For example, the code corresponding to 1a in the first embodiment is 401a in the second embodiment. As for the component parts, the number of actuator parts has been reduced from two to one, and the mechanism and other components are the same as those in the first embodiment. Omits the explanation.

  The thrust center vector Fx1 by the first coil 402a and the thrust center vector Fy1 by the second coil 303a pass through the optical axis O. Thereby, the size of the drive coil can be maximized.

If the ball receiving surface is configured so as not to overlap the drive coil when viewed from the optical axis direction, the first drive coil 302 and the second drive coil 303 cannot be brought closer to each other as shown in FIG. Therefore, the size of the drive coil must be reduced or the correction device itself must be enlarged. However, in the third embodiment, the first coil and the second coil are arranged as close as possible by setting the positional relationship (see FIG. 4) so that the driving coil and the ball receiving surface overlap each other when viewed from the optical axis direction. be able to. As a result, it is possible to configure an image shake correction apparatus having a drive device with a high actuator output.

In addition, at least one of the three ball receiving surfaces 401f to 401h (in the example shown in FIG. 8, the ball receiving surface 401h) is positioned so as to overlap with the first coil 402a or the second coil 403a when viewed from the optical axis direction. Is provided. Specifically, the ball receiving surface 401h is provided at a position overlapping the first coil 402a and the second coil 403a when viewed from the optical axis direction. Thereby, the first coil and the second coil can be brought close to each other, and the image blur correction unit can be downsized.

  In the present embodiment, the positions of the ball receiving surfaces 401f, 401g, and 401h are determined so that the range S1 falls within the triangle T4 shown in FIG. That is, the center of gravity G of the lens holder 4 is included in a triangle connecting the three support portions that support the base member 1. Thereby, the lens holder 4 can move stably with respect to the base member 401 (fixed part).

  As for the arrangement positions of the ball receiving surfaces 401f, 401g, and 401h, two of the three ball receiving surfaces shown in FIG. 9 may overlap the drive coil. Since the ball receiving surface can be arranged at a position overlapping with the coil, the degree of freedom in designing the ball receiving surface is increased, and the lens holder 4 can be arranged at a place where the lens holder 4 can be stably held.

According to the image blur correction device of the third embodiment, the ball receiving surface capable of stably holding the lens holder is provided while the size of the driving device can be maximized in the image blur correction device. There are benefits that are possible.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the scope of the present invention. In the foregoing embodiment, an example of performing moved image blur correction operation of the correction lens L1, not limited to this, for example, image blur correction unit, an image pickup device in a plane parallel to the imaging surface It may be moved to perform image blur correction. That is, the image sensor may function as a correction member that corrects image blur .

  In the above-described embodiment, the example in which the Hall element 9 is used as the position detection unit that detects the position of the correction lens L1 has been described. However, other magnetic sensors that sense magnetism, such as an MI (Magneto Impedance) sensor, a magnetic resonance type magnetic field detection element, and an MR (Magneto-Resistance) element, may be used as the position detection means. In addition to the magnetic sensor, an optical sensor that performs optical position detection may be used as the position detection means.

In addition, as an imaging apparatus including the image shake correction unit of the present embodiment, a digital still camera mainly intended for still image shooting has been described as an example, but the imaging apparatus of the present embodiment is not limited to this. The imaging device may be, for example, a film camera, a video camera whose main purpose is moving image shooting, or another type of imaging device. Further, it may be an optical device such as an interchangeable lens used in a digital single lens reflex camera.

1 Base member 4 Lens holder 5 Ball L1 Correction lens

Claims (10)

A correction member for correcting image blur ;
A base member;
A movable member that holds the correction member and is movable relative to the base member in a predetermined direction orthogonal to the optical axis;
A first driving device for moving the movable member in a first direction;
A second driving device for moving the movable member in a second direction;
Three support parts for supporting the movable member with respect to the base member,
Image blur correction characterized in that at least one of the three support portions is provided at a position overlapping with the first drive device or the second drive device as viewed in the optical axis direction. apparatus. When the diameter of the opening provided in the base member around the optical axis, which is necessary for the movable member to move relative to the base member, is D1, and the outer diameter of the base member is D2. In addition, the first and second driving devices are provided on the outer side of the D1 and the inner side of the D2 at positions facing each other with any one of the three support portions interposed therebetween,
The three support portions are provided outside the D1 and inside the D2,
The image blur correction device according to claim 1, wherein a center of gravity of the movable member is included in a triangle connecting the three support portions. The three support portions have ball members,
The base member is a surface on which the ball member slides, and includes a sliding surface provided outside the D1 and inside the D2.
3. The image blur according to claim 2, wherein at least a part of the sliding surface is provided at a position overlapping the first driving device or the second driving device when viewed from the optical axis direction. Correction device. The first and second driving devices include a driving coil and a magnetic member,
The image blur correction device according to claim 3, wherein at least a part of the sliding surface is provided at a position overlapping the driving coil when viewed from the optical axis direction. The magnetic member is disposed on the movable member;
A regulating wall for regulating movement of the ball member in the sliding surface is provided on an outer peripheral portion of the sliding surface,
The image blur correction apparatus according to claim 4, wherein the restriction wall is provided on the movable member on which the magnetic member is disposed. The first and second driving devices are arranged so that the thrust center vector of the first driving device and the thrust center vector of the second driving device do not pass through the optical axis. The image blur correction apparatus according to claim 1. The first drive device and the second drive device are arranged such that a thrust center vector of the first drive device and a thrust center vector of the second drive device pass through the optical axis. The image blur correction device according to claim 1. The image blur correction apparatus according to claim 1, wherein the second direction is a direction orthogonal to the first direction. 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.