JP7305456B2 - image blur correction device, imaging device, lens barrel - Google Patents

Description

The present invention relates to an image blur correction device, an imaging device, and a lens barrel that have a function of correcting blurring during photography.

2. Description of the Related Art In recent years, several types of image blur correction mechanisms have been proposed for use in imaging devices and lens barrels. For example, a method of correcting blurring by driving a part of the lens of the photographing optical system and a method of correcting blurring by driving an imaging element in the camera body are known. A method is also known in which both are combined to drive both some lenses and an image pickup device of the photographing optical system to compensate for blurring.

As an image blur correction mechanism for driving such a lens or an imaging element (hereinafter referred to as an optical element), a method of moving the optical element in a direction perpendicular to the imaging optical axis is generally used. A method called a voice coil motor (VCM) method is known as one of methods for driving an optical element. The VCM method has a configuration in which one of a fixed member and a movable member has a magnet and the other has a coil, and by energizing the coil in a magnetic circuit formed by the magnet, a driving force derived from the Lorentz force is generated. In the VCM method, a predetermined space is provided between the magnet and the coil, and a rolling member such as a ball is provided in the space, thereby reducing loss due to friction and enabling smooth driving. A surface on which the rolling member rolls when driven is called a rolling surface. As a method of forming the rolling surface, a method of attaching a rolling receiving member having a hard surface to the movable member and the fixed member is generally used.

In addition, in order to prevent the rolling parts from falling off, it is common to incorporate a mechanism that generates a biasing force that biases both the fixed member side and the movable member side against the rolling members. As the biasing method, there is a method in which a spring is used to bias the rolling member so that it is sandwiched between the movable member and the fixed member. A method is known in which the movable member and the fixed member are mutually attracted by magnetic force.

JP 2013-231923 A

By the way, in Patent Literature 1, when the movable member is molded from resin, the rolling surface as described above is formed by integrally molding a ball receiving sheet metal made of metal. As a result, the step of mounting the member forming the rolling surface is reduced. However, since the movable member is mainly made of resin, when the optical element held by the movable member is relatively large or heavy, it is difficult to drive the movable member so that the function of the optical element is properly maintained. It is important to secure the strength of the movable member. In particular, when the method of forming the rolling surface as in Patent Document 1 is adopted, the strength of the movable member is not taken into account, and there is a risk of insufficient strength.

An object of the present invention is to form a strong rolling surface in a movable member having a resin portion and to increase the strength of the movable member.

In order to achieve the above object, the present invention has a fixed member, a rolling member, a sheet metal member made of a non-magnetic material , and a resin portion integrally formed with the sheet metal member, and holds an optical element. a movable member movable relative to the fixed member in a direction perpendicular to the optical axis of the optical element via a movable member; and a magnet for driving the movable member in a direction perpendicular to the optical axis. and biasing means for biasing the movable member toward the fixed member in the optical axis direction, the magnetic portion comprising : A portion of the movable member where the sheet metal member is exposed from the resin portion is a rolling surface on which the rolling member rolls, and the sheet metal The member is characterized by being formed in a shape surrounding the optical element when viewed from the optical axis direction.

ADVANTAGE OF THE INVENTION According to this invention, while forming a firm rolling surface in the movable member which has a resin part, the intensity|strength of a movable member can be improved.

1 is a cross-sectional view of an imaging device to which an image blur correction device is applied, and a block diagram showing an electrical configuration; FIG. 3A and 3B are a perspective view and an exploded perspective view of a camera-side blur correction unit; FIG. FIG. 4 is a diagram of the movable member viewed from the + side and the − side in the z-axis direction, and a diagram of the movable unit viewed from the − side in the z-axis direction. FIG. 4B is a view of the camera-side blur correction unit viewed from the + side in the z-axis direction, and is a view showing a part of a cross section taken along lines AA and BB in FIG. 4A. A view of the camera-side blur correction unit viewed from the + side in the z-axis direction, a view of the movable member viewed from the - side in the z-axis direction, and part of a cross section taken along lines CC and DD in FIG. 5(a). It is a figure which shows. FIG. 6B is a view of the camera-side blur correction unit viewed from the + side in the z-axis direction, and is a view showing a part of the cross section taken along line EE in FIG. 6A. FIG. 7B is a view of the camera-side blur correction unit viewed from the + side in the z-axis direction, a view showing a part of a cross section taken along line FF of FIG. 7A, and a cross-sectional view of a comparative example. FIG. 8B is a view of the movable member viewed from the + side in the z-axis direction, and a cross-sectional view taken along line JJ in FIG. 8A. FIG. 9B is a view of the lens-side blurring correction unit viewed from the + side in the z-axis direction, and a cross-sectional view taken along lines GG and HH in FIG. 9A.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1(a) is a sectional view of an imaging device to which an image blur correction device according to a first embodiment of the present invention is applied. FIG. 1B is a block diagram showing the electrical configuration of the imaging device 1000. As shown in FIG. This imaging apparatus 1000 is composed of a camera body 1 and a lens barrel 2 . The lens barrel 2 is detachable from the camera body 1, and the imaging device 1000 is a so-called interchangeable lens camera. The present invention can also be applied to an imaging apparatus in which the camera body 1 and the lens barrel 2 are fixed and cannot be removed.

The lens barrel 2 has a photographing optical system 3 , a lens system control section 12 , a lens drive section 13 and a lens side blur detection section 16 . The photographing optical system 3 consists of a plurality of lenses. The lens driving unit 13 drives the focus lens for adjusting the focus and the blur correction lens 3a for correcting the blur. The lens drive section 13 has a lens side blur correction section 13a. The lens-side blur correction unit 13a drives the blur correction lens 3a in a direction perpendicular to the optical axis 4 (imaging optical axis) of the photographing optical system 3. As shown in FIG. A lens-side blurring detection unit 16 detects the amount of blurring of the imaging device 1000 .

The camera body 1 includes a camera system control unit 5, an image pickup device 6, an image processing unit 7, a memory unit 8, a display unit 9, an operation detection unit 10, a camera shake correction unit 14, a camera shake detection unit 15, and an electrical contact 11. have The imaging element 6 is an optical element that photoelectrically converts an optical image formed through the lens barrel 2 . The display unit 9 includes a rear display device 9 a provided on the rear surface of the camera body 1 and an EVF (electronic viewfinder) 9 b provided within the viewfinder of the camera body 1 . An operation detection unit 10 detects a signal from an operation unit including a shutter release button (not shown). An electrical contact 11 is an electrical contact for communication between the camera body 1 and the lens barrel 2 . The camera-side blur correction unit 14 drives the imaging device 6 in a direction perpendicular to the optical axis 4 . A camera-side blurring detection unit 15 detects the amount of blurring of the imaging device 1000 .

An imaging device 1000 including a camera body 1 and a lens barrel 2 has an imaging section, an image processing section, a recording/playback section, and a control section. The imaging section referred to here includes the imaging optical system 3 and the imaging device 6 , and the image processing section includes the image processing section 7 . Also, the recording/reproducing section includes a memory section 8 and a display section 9 . The controller includes a camera system controller 5, an operation detector 10, a camera shake detector 15, a camera shake corrector 14, a lens system controller 12, a lens shake detector 16, and a lens shake corrector 13a. includes a lens drive unit 13 including Note that the lens system control unit 12 and the lens driving unit 13 can also drive a focus lens (not shown), a diaphragm, and the like, in addition to the blur correction lens 3a.

The camera-side shake detection unit 15 and the lens-side shake detection unit 16 are capable of detecting rotation of the imaging device 1000 with respect to the optical axis 4, which is realized using, for example, a vibrating gyro. The camera-side blur correction unit 14 is a mechanism that drives the imaging device 6 on a plane perpendicular to the optical axis 4 . The lens-side blur correction unit 13 a is a mechanism that drives the blur correction lens 3 a in a direction perpendicular to the optical axis 4 .

The imaging unit described above is an optical processing system that forms an image of light from an object on the imaging surface of the imaging element 6 via the imaging optical system 3 . Since the focus evaluation amount/appropriate exposure amount can be obtained from the image pickup device 6, the imaging optical system 3 is appropriately adjusted based on this signal, so that the image pickup device is exposed to an appropriate amount of object light. A subject image is formed in the vicinity of the image sensor 6 .

The image processing unit 7 has therein an A/D converter, a white balance adjustment circuit, a gamma correction circuit, an interpolation calculation circuit, etc., and can generate an image for recording. The color interpolation processing section is provided in the image processing section 7, and generates a color image by applying color interpolation (demosaicing) processing from the Bayer array signal. The image processing unit 7 also compresses images, moving images, audio, etc. using a predetermined method. Note that since the image processing unit 7 can also generate a blur detection signal based on comparison between a plurality of images obtained from the image sensor 6, camera side blur detection is performed by the image sensor 6 and the image processing unit 7. A unit 15 may be configured.

The memory unit 8 has a storage medium. The camera system control unit 5 outputs images to the memory unit 8 and displays images to be presented to the user on the display unit 9 . The camera system control unit 5 generates and outputs a timing signal and the like for imaging. The camera system control unit 5 controls the imaging system, the image processing system, and the recording/reproducing system in response to external operations. For example, pressing of a shutter release button (not shown) is detected by the operation detection unit 10, and the camera system control unit 5 controls the driving of the imaging element 6, the operation of the image processing unit 7, compression processing, and the like. Further, the camera system control section 5 controls the state of each segment on the display section 9 . Since the rear display device 9a is a touch panel, it may serve as both the display section 9 and the operation section.

The adjustment operation of the optical system will be described. An image processing unit 7 is connected to the camera system control unit 5 , and the camera system control unit 5 obtains an appropriate focus position and aperture position based on signals from the image sensor 6 . The camera system control section 5 issues commands to the lens system control section 12 via the electrical contacts 11, and the lens system control section 12 appropriately controls a focus lens drive section and a diaphragm drive section (not shown). Furthermore, in the blur correction mode, the camera system control section 5 appropriately controls the camera side blur correction section 14 based on the signal obtained from the camera side blur detection section 15 . Similarly, the lens system control section 12 appropriately controls the lens blur correction section 13 a based on the signal obtained from the lens blur detection section 16 .

As a specific control method, first, the camera system control section 5 and the lens system control section 12 acquire camera shake signals detected by the camera side shake detection section 15 and the lens side shake detection section 16, respectively. Then, based on the acquired signal, the camera system control unit 5 and the lens system control unit 12 respectively calculate the driving amount of the imaging element 6 and the driving amount of the blur correction lens 3a for correcting the image blur. After that, the camera system control unit 5 and the lens system control unit 12 respectively send the calculated driving amounts to the camera side blur correction unit 14 and the lens side blur correction unit 13a as command values, and Drive 3a.

Further, as described above, the camera system control unit 5 and the lens system control unit 12 control the camera body 1 and the lens barrel 2 according to the user's operation on the operation units provided on the camera body 1 and the lens barrel 2 . controls the operation of each part of the As a result, it is possible to shoot still images and moving images.

2A and 2B are a perspective view and an exploded perspective view of the camera-side blur correction section 14. FIG. The camera-side blur correction unit 14 that displaces the image sensor 6 in a direction perpendicular to the optical axis 4 will be described with reference to FIGS. 2(a) and 2(b). The direction of the camera-side blur correction unit 14 will be described using the coordinate axes shown in FIG. 2(a). Specifically, the longitudinal direction of the imaging device 6 is the x-axis, the lateral direction of the imaging device 6 is the y-axis, and the direction of the optical axis 4 (imaging optical axis direction) is the z-axis. The + side in the z-axis direction is the object side. The + side in the y-axis direction is the upper side of the imaging apparatus 1000 during normal use.

The camera side blur correction section 14 mainly has a movable unit and a fixed member 28 . This movable unit includes a movable member 20 , a coil 21 , a position detector 22 , a flexible substrate 23 and an imaging device 6 . A movable unit in which these are integrated can be displaced in a direction perpendicular to the optical axis 4 relative to the fixed member 28 .

As shown in FIG. 2B, three drive coils 21 (21a, 21b, 21c) are provided. The coils 21 include one coil 21a for driving the movable member 20 in the x-axis direction and two coils 21b and 21c for driving it in the y-axis direction. These three coils 21 allow the movable member 20 to move in the x-axis direction and the y-axis direction and to rotate around the z-axis.

The position detectors 22 (22a, 22b, 22c) are provided inside the coils 21a, 21b, 21c and detect the positions of the coils 21a, 21b, 21c, respectively . The position detection unit 22 is composed of, for example, a Hall element, and detects the position of the corresponding coil 21 by detecting a change in magnetic flux density within a magnetic field generated by a magnet, which will be described later. Thereby, the position of the movable member 20 is detected. Coil 21 and position detector 22 are mounted on flexible substrate 23 . The flexible substrate 23 electrically connects a drive circuit (not shown) and the movable member 20 .

The camera-side blur correction unit 14 further includes a plurality of driving magnets 24 , first yoke 25 , and second yoke 29 . The second yoke 29 is divided into a second yoke 29a facing the coil 21a and a second yoke 29b facing the coils 21b and 21c. However, the second yoke 29 need not be divided into two. The spacer 27 is a member for fixing the first yoke 25 to the fixing member 28 while maintaining a constant distance between the fixing member 28 and the first yoke 25 . The spacer 27 also serves as a drive restricting portion against which the movable member 20 abuts before it is displaced to the drive limit region when it is driven. The drive limit area is the maximum range within which the coil 21 does not protrude beyond the area where the magnet 24 is arranged.

A total of 12 magnets 24 are provided. Of the magnets 24 , magnets 24 g to 24 l are fixed to a fixing member 28 via a second yoke 29 . The positions of the magnets 24g to 24l are fixed by inserting the magnets 24g to 24l into openings provided in the fixing member 28 and fixing the second yoke 29 from the - side in the z-axis direction. The magnets 24a to 24f are arranged on the opposite side of the fixed member 28 with the movable member 20 interposed therebetween in the four directions of the optical axis. Three rolling balls 26 , which are rolling members, are arranged between the movable member 20 and the fixed member 28 . When the movable member 20 is driven with respect to the fixed member 28, the rolling ball 26 rolls, so that the movable member 20 can be displaced with respect to the fixed member 28 with little friction.

Next, the role of each part when the movable member 20 is driven will be described. When the movable member 20 is driven in the x-axis direction, the movable member 20 is driven in the x-axis direction by the coil 21a and the magnets 24a, 24b, 24g, and 24h facing the coil 21a. By energizing the coil 21a arranged in the magnetic circuit formed by the magnets 24a, 24b, 24g and 24h, the coil 21a receives the Lorentz force, thereby moving the movable member 20 in the x-axis direction.

When the movable member 20 is driven in the y-axis direction, the movable member 20 is driven by the coils 21b and 21c and the magnets 24c, 24d, 24e, 24f, 24i, 24j, 24k, and 24l facing the coils 21b and 21c. Driven in the y-axis direction. By energizing the coil 21b arranged in the magnetic circuit formed by the magnets 24c, 24d, 24i and 24j, the coil 21b receives Lorentz force in the y-axis direction. Similarly, by energizing the coil 21c arranged in the magnetic circuit formed by the magnets 24e, 24f, 24k, and 24l, the coil 21c receives Lorentz force in the y-axis direction. When the coils 21b and 21c are energized so as to receive force in the same direction, the movable member 20 is translated in the y-axis direction. When the coils 21b and 21c are energized so as to receive forces in directions opposite to each other, the movable member 20 rotates about a rotation axis parallel to the z-axis direction. Therefore, the movable member 20 in the camera-side blur correction section 14 can be translated and rotated around the z-axis within a plane (xy plane) perpendicular to the optical axis 4 .

3A and 3B are diagrams of the movable member 20 viewed from the + side in the z-axis direction and the - side in the z-axis direction. FIG. 3(c) is a view of the movable unit including the movable member 20 and the imaging element 6 as viewed from the - side in the z-axis direction. 3(a) to 3(c), in addition to the explanation of the movable unit, the formation of the rolling surface with the insert sheet metal will be explained.

As shown in FIG. 3A, the movable member 20 has a resin portion 20a and a sheet metal member 20b. In the movable member 20, the sheet metal member 20b is integrally molded with the resin portion 20a. That is, the sheet metal member 20b is formed integrally with the resin portion 20a by insert molding. In FIGS. 3A and 3B, the portion indicated by broken lines is the sheet metal member 20b. Basically (except for the rolling surface 30, which will be described later), the sheet metal member 20b is integrally molded so as to be covered with the resin portion 20a. The sheet metal member 20b is made of a magnetic metal.

As shown in FIG. 3B, the movable member 20 is provided with rolling surfaces 30 (30a, 30b, 30c) that contact the rolling balls 26. As shown in FIG. The rolling surface 30 is a part of the sheet metal member 20b, and the portion of the movable member 20 exposed from the resin portion 20a to the - side in the z-axis direction serves as the rolling surface 30. As shown in FIG. A plurality of rolling surfaces 30 are provided as surfaces on which the rolling balls 26 roll when the movable member 20 moves in the x-axis direction and the y-axis direction. Three moving surfaces 30 are provided. Rolling surfaces 30a to 30c are formed by partially exposing the sheet metal member 20b from the resin portion 20a when the sheet metal member 20b is integrally molded with the resin portion 20a.

Since the movable member 20 is in contact with the fixed member 28 via the rolling ball 26, when the camera body 1 receives an impact such as being dropped, the movable member 20 impacts the fixed member 28 via the rolling ball 26. receive. At that time, if scratches or dents remain on the rolling surface 30, the rolling balls 26 do not move smoothly at the locations where the scratches or dents are present during subsequent shake correction, which affects the shake correction. Therefore, the rolling contact surface 30 is required to have a degree of hardness (hardness) that can withstand the impact. Therefore, when the movable member 20 is made of resin or the like having relatively low hardness, it is necessary to separately use a member having high hardness as the member forming the rolling surface 30 . Conventionally, when a movable member is formed of resin or the like, a method of attaching a separate member of sheet metal with high hardness to the rolling surface has been adopted in many cases. However, in the case of attaching sheet metal, not only is the number of attaching steps increased, but there is also the problem that assembly tolerances due to oblique assembly of parts are included in addition to component tolerances for individual components.

In this embodiment, since the sheet metal member 20b contacts the rolling balls 26 on the rolling surface 30, the rolling surface 30 can have sufficient hardness to withstand impact. In addition, since the sheet metal member 20b and the resin portion 20a are integrally formed, there is no need to provide a bonding step in the manufacturing process of the movable member 20, and variation in the rolling surface 30 due to bonding can be avoided.

As can be seen by comparing FIG. 3(c) and FIG. 3(b), the sheet metal member 20b is arranged so as to surround the imaging device 6 when viewed from the z-axis direction (or the optical axis 4 direction). there is By forming the sheet metal member 20b in such a shape as to surround the imaging device 6, the strength of the movable member 20 can be increased while the movable member 20 is mainly made of resin. In particular, when driving a relatively large component of the image pickup apparatus 1000, such as the image pickup device 6 or a large optical member, a large force is applied to the movable member 20 when it receives an impact such as being dropped. Therefore, if the movable member 20 were constructed only of resin, it would not be able to withstand the impact, causing deformation or breakage, which could affect the captured image. Therefore, the strength of the movable member 20 is increased by integrally molding the sheet metal member 20b with the resin portion 20a and arranging the inserted sheet metal member 20b in the entire movable member 20 so as to surround the imaging element 6. , deformation and breakage can be prevented.

Furthermore, by arranging the sheet metal member 20b so as to surround the imaging element 6, noise (image deterioration) generated in the imaging element 6 can be reduced. As described with reference to FIG. 2, the movable member 20 is driven by the Lorentz force generated by energizing the coil 21 arranged in the magnetic circuit formed by the magnet 24 . At that time, due to the influence of the magnetic field generated by the coil 21 , a signal that is not originally captured may be generated as noise (hereinafter referred to as magnetic noise) in the imaging element 6 . However, by arranging the sheet metal member 20 b so as to surround the imaging element 6 , the magnetic field generated in the coil 21 is shielded by the sheet metal member 20 b and becomes less likely to reach the imaging element 6 . By surrounding the imaging device 6 with the sheet metal member 20b in this way, it is possible to reduce the magnetic noise generated by the energization of the coil 21. FIG.

Next, an urging mechanism (urging means) for urging the movable member 20 against the fixed member 28 in the camera side blur correction section 14 will be described with reference to FIG. FIG. 4A is a view of the camera-side blur correction section 14 as seen from the + side in the z-axis direction. 4(b) and 4(c) are diagrams showing part of cross sections taken along lines AA and BB of FIG. 4(a), respectively.

As shown in FIG. 4B, the imaging element 6 is attached and fixed to the movable member 20 with an adhesive 40. As shown in FIG. Thereby, the movable member 20 holds the imaging element 6 fixedly. The reason why the surface of the movable member 20 that is bonded to the imaging element 6 by the adhesive 40 is formed of the resin portion 20a will be described. In general, when bonding using an adhesive, it is necessary to provide a place for applying the adhesive (hereinafter referred to as an adhesive pool). In general, the same imaging element 6 can be used for many models, whereas the movable member 20 is designed for each model, so the adhesive pool is also designed for each model. Therefore, it is preferable to form the bonding surface with the resin portion 20a in order to have a higher degree of freedom in shape and to be able to freely arrange the adhesive pools.

Moreover, when the camera body 1 is exposed to a high-temperature or low-temperature environment, the coefficient of linear expansion between the outer peripheral portion of the imaging element 6, which is one of the adhesive surfaces, and the part of the movable member 20, which is the other adhesive surface, varies. If the difference is large, the imaging element 6 and the movable member 20 may warp with each other. This is due to the generation of thermal strain. As described above, when the imaging element 6 is warped with respect to the movable member 20, the imaging element 6 is tilted with respect to the optical axis 4, and the imaging element 6 is tilted with respect to the imaging plane of the imaging apparatus 1000, resulting in a captured image. There is a problem that part of the image may be blurred. One method of solving this problem is to make the linear expansion coefficient of the bonding surface of the movable member 20 bonded to the imaging device 6 closer to the linear expansion coefficient of the bonding surface on the imaging device 6 side.

In this embodiment, the movable member 20 is composed of a resin portion 20a and a sheet metal member 20b. If there is a large difference in linear expansion coefficient between the sheet metal member 20b and the imaging element 6, it is preferable to use a resin material having a linear expansion coefficient close to that of the imaging element 6 to form the resin portion 20a. Considering the degree of freedom in material selection as described above, it is preferable that the bonding surface where the movable member 20 is bonded to the imaging element 6 is formed of the resin portion 20a. In this way, it is preferable that the surface of the movable member 20 to which the imaging element 6 is adhered is composed of the resin portion 20a from the viewpoint of the degree of freedom of shape and the physical properties of the material.

Next, a biasing mechanism for biasing the movable member 20 against the fixed member 28 will be described. As shown in FIG. 4(c), the rolling ball 26 is arranged on the - side of the movable member 20 in the z-axis direction. In this case, it is preferable that the movable member 20 is also biased toward the - side in the z-axis direction. In general, when biasing the fixed member and the movable member, it is necessary to separately provide a member for biasing. However, in this embodiment, the magnetism of the sheet metal member 20b and the magnet 24 are used to obtain the biasing force.

The sheet metal member 20b is made of a magnetic material. As can be seen from FIG. 4B, a part of the sheet metal member 20b faces the magnet 24, so the sheet metal member 20b is attracted to the magnet 24. As shown in FIG. The attraction of the sheet metal member 20b to the magnet 24 is hereinafter referred to as "magnetic attraction". Therefore, depending on the distance from the sheet metal member 20b to each magnet 24 in the z-axis direction, the movable member 20 is either on the first yoke 25 side (z-axis direction + side) or the second yoke 29b side (z-axis direction - side). It determines whether it is strongly magnetically attracted.

Here, the distance 41 shown in FIG. 4B is the distance from the sheet metal member 20b to the magnets 24e and 24f attached to the first yoke 25. As shown in FIG. A distance 42 is the distance from the sheet metal member 20b to the magnets 24k and 24l attached to the second yoke 29b. When comparing these distances 41 and 42, the position of the sheet metal member 20b is the central position in the thickness direction of the sheet metal member 20b. In this embodiment, distance 42 is shorter than distance 41 . Therefore, the attraction force on the sheet metal member 20b is stronger on the − side in the z-axis direction than on the + side in the z-axis direction. Similarly, the sheet metal member 20b is closer to the magnets 24g and 24h (FIG. 2(b)) than to the magnets 24a and 24b. Therefore, the rolling balls 26 can smoothly drive the rolling surface 30 with less loss due to friction.

Thus, in the movable member 20, the sheet metal member 20b is formed integrally with the resin portion 20a so as to be closer to the magnet 24 on the − side in the z-axis direction than to the magnet 24 on the + side in the z-axis direction. This allows the sheet metal member 20b to not only provide the rolling surface 30, but also function as an urging mechanism.

According to the present embodiment, the portion of the movable member 20 where the sheet metal member 20b is exposed from the resin portion 20a serves as the rolling surface 30. As shown in FIG. As a result, a strong rolling surface can be formed in the movable member 20 having a resin portion, and the number of man-hours for forming the rolling surface 30 can be reduced. Further, the sheet metal member 20b is formed integrally with the resin portion 20a to form the movable member 20, and the sheet metal member 20b is formed in a shape surrounding the imaging device 6 when viewed from the optical axis 4 directions. Thereby, the strength of the movable member 20 can be increased. Moreover, magnetic noise generated by energization of the coil 21 can be reduced.

Also, a portion (magnetic portion) of the sheet metal member 20b is used to bias the movable member 20 and the fixed member 28 so as to attract each other. Moreover, since the distance 42 is shorter than the distance 41, the movable member 20 is urged toward the fixed member 28 side. As a result, in order to prevent the rolling balls 26 from falling off, it is possible to simplify the manufacturing process by eliminating the need for a separate biasing member.

Further, the imaging element 6 is fixed to the resin portion 20a of the movable member 20. As shown in FIG. As a result, the adhesive surface on which the movable member 20 is attached to the imaging element 6 can be made more flexible in terms of material selection and shape.

(Second embodiment)
An imaging apparatus according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the configuration of the sheet metal member 20b in the movable member 20 is different from that of the first embodiment, and other configurations are basically the same as those of the first embodiment. Therefore, mainly different points from the first embodiment will be explained.

FIG. 5A is a view of the camera-side blur correction unit 14 as seen from the + side in the z-axis direction. FIG. 5(b) is a view of the movable member viewed from the - side in the z-axis direction. FIGS. 5(c) and 5(d) are diagrams showing part of cross sections along lines CC and DD of FIG. 5(a), respectively.

The camera-side blur correction section 14 has a movable member 50 . The movable member 50 includes a resin portion 50a, a sheet metal member 50b, and a magnetic sheet metal 50c for magnetic attraction. A movable member 50, a resin portion 50a, and a sheet metal member 50b correspond to the movable member 20, the resin portion 20a, and the sheet metal member 20b in the first embodiment, respectively. In the movable member 50, the sheet metal member 50b and the magnetic sheet metal 50c are formed integrally with the resin portion 50a. Rolling surfaces 30a to 30c are formed by partially exposing the sheet metal member 50b (only the rolling surface 30b is shown in FIG. 5(d)).

The sheet metal member 20b in the first embodiment is made of a magnetic material, but the sheet metal member 50b is made of a non-magnetic material. On the other hand, the magnetic sheet metal 50c is made of a magnetic material. As shown in FIG. 5(c), the magnetic sheet metal 50c is arranged so that the movable member 50 as a whole is magnetically attracted to the - side in the z-axis direction. That is, the distance from the magnetic sheet metal 50c to the magnets 24 (24g to 24l) on the negative side in the z-axis direction is shorter than the distance from the magnetic sheet metal 50c to the magnets 24 (24a to 24f) on the positive side in the z-axis direction. ing. Therefore, the movable member 50 is biased toward the fixed member 28 side.

Since the sheet metal member 50b is non-magnetic, the sheet metal member 50b is not attracted to the magnet 24. FIG. Since the biasing force is generated by the magnetic sheet metal 50c, it is not necessary to place the sheet metal member 50b away from the magnet 24 on the positive side in the z-axis direction. In the first embodiment (FIG. 4(b)), there is no need to make the distance 42 shorter than the distance 41. FIG. Compared to the first embodiment, it is possible to offset the movable member 50 to the - side in the z-axis direction without changing the position of the rolling surface 30b in the z-axis direction. For example, as shown in FIG. 5D, the thickness of the movable member 50 can be reduced by the offset amount 51 . Accordingly, the first yoke 25 and the magnets 24 (24a to 24f) fixed thereto can also be offset to the - side in the z-axis direction. As a result, it becomes possible to make the camera-side blur correction unit 14 thinner in the z-axis direction.

According to the present embodiment, forming a strong rolling surface 30, reducing the number of man-hours for forming the rolling surface 30, and increasing the strength of the movable member 50 are the same as in the first embodiment. It is possible to achieve the effect of In addition, since the magnetic sheet metal 50c, which is a member different from the sheet metal member 50b, can provide an urging force, and the sheet metal member 50b is made of a non-magnetic material, it contributes to the miniaturization and thinning of the camera side blur correction section 14. do.

(Third Embodiment)
An imaging device according to a third embodiment of the present invention will be described with reference to FIG. This embodiment differs from the first embodiment in the configuration of the biasing mechanism for biasing the movable member against the fixed member 28 in the camera side blur correction section. It is physically the same as the first embodiment. Therefore, mainly different points from the first embodiment will be explained.

FIG. 6(a) is a view of the camera-side blur correction unit viewed from the + side in the z-axis direction. FIG. 6(b) is a view showing a part of the cross section taken along line EE in FIG. 6(a). The imaging apparatus of this embodiment has a camera-side blur correction section 60 corresponding to the camera-side blur correction section 14 .

The camera-side blur correction section 60 has a movable member 61 . The movable member 61 has a sheet metal member 61b and a resin portion 61a, and the sheet metal member 61b is integrally formed with the resin portion 61a. A movable member 61, a resin portion 61a and a sheet metal member 61b correspond to the movable member 20, the resin portion 20a and the sheet metal member 20b in the first embodiment, respectively. A part of the sheet metal member 61b is exposed to form the rolling surface 30 (not shown in FIG. 6).

A biasing spring 63 is hooked between the movable member 61 and the fixed member 28 . One end of the biasing spring 63 is engaged with a spring hook provided on the sheet metal member 61b, and the other end is engaged with a spring hook provided on the fixing member . It does not matter where the movable member 61 or fixed member 28 is engaged with the biasing spring 63 . The biasing spring 63 is attached in tension. Therefore, the movable member 61 and the fixed member 28 are urged in a mutually attracted direction. This eliminates the need to use a sheet metal member as the biasing mechanism. Therefore, the sheet metal member 61b may be made of a non-magnetic material.

According to the present embodiment, forming a strong rolling surface 30, reducing the number of man-hours for forming the rolling surface 30, and increasing the strength of the movable member are the same as in the first embodiment. It is possible to achieve the effect of Further, since the movable member 61 and the fixed member 28 are urged by the urging spring 63, the urging mechanism can be simplified without using a magnetic body.

In addition to the biasing mechanism using the magnetic material in the first and second embodiments, the biasing spring 63 may be provided.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the shape of the sheet metal member of the movable member 20 is different from that of the first embodiment, and other configurations are basically the same. Therefore, mainly different points from the first embodiment will be explained.

FIG. 7A is a view of the camera-side blur correction unit 14 viewed from the + side in the z-axis direction. FIG. 7(b) is a diagram showing a part of a cross section taken along line FF of FIG. 7(a). FIG. 7(c) is a diagram showing a part of a cross section along the FF line of the camera side blur correction section 14 in the first embodiment as a comparative example. A detailed description of FIG. 7(c) is omitted.

Movable member 20 in the present embodiment has resin portion 20 a and sheet metal member 70 . The sheet metal member 70 corresponds to the sheet metal member 20b in the first embodiment, and is made of a magnetic material. In FIG. 7(b), the sheet metal member 70 is bent at the bent portion 70a, and a step is generated at the bent portion 70a. Due to this step, other areas are closer to the fixed member 28 than the area of the rolling contact surface 30 (only 30a is shown in FIG. 7(b)). In other words, a part of the sheet metal member 70 facing the magnet 24, which is used for urging by magnetic attraction, is located on the negative side of the magnet 24 (24g to 24l) in the z-axis direction compared to the first embodiment. ) can be approximated. The part of the sheet metal member 70 facing the magnet 24 here is a region other than the rolling surface 30, and is preferably closer to the magnet 24 on the - side in the z-axis direction for magnetic attraction. By providing the bent portion 70a, the part can be positioned on the − side in the z-axis direction with respect to the end position of the rolling ball 26 on the + side in the z-axis direction.

As a result, the thickness of the movable member 20 can be reduced by the offset amount 71 shown in FIG. 7(b). Accordingly, the first yoke 25 and the magnets 24 (24a to 24f) fixed thereto can also be offset to the - side in the z-axis direction. As a result, it becomes possible to make the camera-side blur correction unit 14 thinner in the z-axis direction.

According to the present embodiment, formation of a strong rolling surface 30, reduction in the number of steps for forming the rolling surface 30, and enhancement of the strength of the movable member 20 are the same as in the first embodiment. It is possible to achieve the effect of In addition, the sheet metal member 70 is provided with a step (bent portion 70a), and the rest of the sheet metal member 70 is closer to the fixing member 28 than the rolling surface 30 in the four directions of the optical axis. contributes to the miniaturization and thinning of products.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIGS. In this embodiment, the configuration of the movable member 20 is different from that of the first embodiment, and other configurations are basically the same. Therefore, mainly different points from the first embodiment will be explained.

2. Description of the Related Art Generally, there is a known problem that when fine dust is deposited on an imaging element in an imaging apparatus, the dust is reflected in the captured image. As a countermeasure, a dust removal mechanism may be adopted in which a cover glass is provided on the subject side of the imaging element, and the cover glass is vibrated to transport and remove fine dust. This embodiment employs such a dust removal mechanism.

FIG. 8A is a diagram of the movable member 101 viewed from the + side in the z-axis direction. FIG. 8(b) is a cross-sectional view taken along line JJ in FIG. 8(a). The same reference numerals are given to the same components as in the first embodiment. A movable member 101, a resin portion 101a, and a sheet metal member 101b correspond to the movable member 20, the resin portion 20a, and the sheet metal member 20b in the first embodiment, respectively.

The movable member 101 has a piezoelectric element 102 , a vibrating member 103 and a conductive member 104 . The vibrating member 103 is a member to which vibration is applied by the piezoelectric element 102 . Piezoelectric element 102 is fixed to vibration member 103 . The vibrating member 103 is arranged so as to cover the entire area of the imaging device 6 from the subject side in the optical axis 4 direction with respect to the imaging device 6 (the side opposite to the fixing member 28 in the optical axis 4 direction). The vibrating member 103 is a cover member that performs the same function as the cover glass in the dust removing mechanism described above. That is, the vibrating member 103 plays a role of preventing fine dust from adhering to the imaging device 6 . By vibrating the vibrating member 103 with the piezoelectric element 102 , it is possible to remove fine dust adhering to the vibrating member 103 .

The conductive member 104 has the function of fixing the piezoelectric element 102 and the vibrating member 103 to the resin portion 101a and electrically connecting them with the sheet metal member 101b. The conductive screw 105 as a fastening member is conductive and electrically connects the conductive member 104 and the sheet metal member 101b. The sheet metal member 101b has a conductive connection portion 101c. The conductive connecting portion 101c is formed by bending or burring the sheet metal member 101b, and has a height in the four directions of the optical axis. A female thread into which the male thread of the conductive screw 105 is screwed is formed in the conductive connecting portion 101c.

The conductive screw 105 is screwed into the conductive connecting portion 101c of the sheet metal member 101b through the resin portion 101a, thereby fixing the conductive member 104 together with the piezoelectric element 102 and the vibrating member 103 to the resin portion 101a and the sheet metal member 101b. be done. Furthermore, the vibrating member 103 is electrically connected to the sheet metal member 101b through the conductive member 104 by the contact between the conductive screw 105 and the conductive connection portion 101c.

By the way, it is generally known that a piezoelectric element generates static electricity because it has the property of repeating expansion and contraction at high speed. Therefore, there is a problem that the static electricity attracts fine dust in the surroundings. Therefore, conventionally, a configuration is known in which a conductive member is provided around the piezoelectric element and the conductive member is connected to a large metal member to remove the static electricity generated in the piezoelectric element. This configuration is adopted in the present embodiment.

As described above, in the present embodiment, movable member 101 is configured by integrally molding sheet metal member 101b and resin portion 101a. Therefore, it is preferable to provide a conductive member 104 around the piezoelectric element 102 and conduct it to the sheet metal member 101b. Therefore, the conductive member 104 is formed in a shape surrounding the piezoelectric element 102 when viewed from the four optical axis directions. Further, the conductive member 104 and the sheet metal member 101b are connected via the conductive screw 105 at the conductive connecting portion 101c. As a result, static electricity generated in the piezoelectric element 102 can be removed.

According to the present embodiment, forming a strong rolling surface 30, reducing the number of man-hours for forming the rolling surface 30, and increasing the strength of the movable member are the same as in the first embodiment. It is possible to achieve the effect of

Further, even when the piezoelectric element 102 and the vibration member 103 are provided to remove fine dust, static electricity can be removed by electrically connecting the conductive member 104 and the sheet metal member 101b. .

(Sixth embodiment)
In the first to fifth embodiments, the image blur correction device is applied to the camera body 1, but in the sixth embodiment of the present invention, an example in which the image blur correction device is applied to the lens barrel 2 will be described. do. Specifically, the present invention is applied to the lens side blur correction section 13a (FIG. 1).

FIG. 9A is a view of the lens side blur correction section 13a as seen from the + side in the z-axis direction. 9B and 9C are cross-sectional views taken along lines GG and HH in FIG. 9A, respectively.

The movable member 80 has a resin portion 80a and a sheet metal member 80b. The sheet metal member 80b is integrally formed with the resin portion 80a. The blur correction lens 3 a is fixed to the movable member 80 , and the blur correction lens 3 a can also be displaced according to the driving of the movable member 80 . The movable member 80 includes a coil 81, a position detection section 82, a magnet 83, a yoke 84, a rolling ball 85, a fixing member 86, an adhesive 88, a rolling surface 89, and other components that hold the movable member 80 at the center of the optical axis 4. It has an optical axis biasing spring 87 for. The coil 81, the position detector 82, the magnet 83, and the yoke 84 of the movable member 80 correspond to the coil 21, the position detector 22, the magnet 24, and the first yoke 25 of the movable member 20 (FIG. 4, etc.). The rolling ball 85 , fixed member 86 , adhesive 88 and rolling surface 89 of the movable member 80 correspond to the rolling ball 26 , fixed member 28 , adhesive 40 and rolling surface 30 of the movable member 20 .

In the movable member 80, position detectors 82 (82a, 82b) are provided corresponding to the coils 81 (81a, 81b). There are eight magnets 83, consisting of magnets 83a, 83b, 83e and 83f arranged to face the coil 81a and magnets 83c, 83d, 83g and 83h arranged to face the coil 81b. By energizing the coil 81 arranged in the magnetic circuit generated by these magnets 83, the movable member 80 receives the Lorentz force, and the movable member 80 can move parallel in the x-axis direction and the y-axis direction. .

The rolling surface 89 is a part of the sheet metal member 80b exposed from the resin portion 80a in the movable member 80 and contacts the rolling balls 85. As shown in FIG. The rolling surfaces 89 are provided at three locations (rolling surfaces 89a, 89b, 89c). As can be seen from FIGS. 9A and 9B, the sheet metal member 80b is arranged so as to surround the blur correction lens 3a as an optical element when viewed from the optical axis 4 directions. This increases the strength of the movable member 80 . Further, the bonding surface where the movable member 80 is bonded to the blur correction lens 3a with the adhesive 88 is constituted by the resin portion 80a.

As shown in FIG. 9(c), the rolling ball 85 is arranged on the - side of the movable member 80 in the z-axis direction. Therefore, it is preferable that the movable member 80 is biased toward the - side in the z-axis direction. Therefore, as in the first embodiment, an urging mechanism utilizing the magnetism of the sheet metal member 80b is provided. Here, a distance 91 shown in FIG. 9C is the distance from the sheet metal member 80b to the magnets 83e to 83h in the four directions of the optical axis. A distance 92 is the distance from the sheet metal member 80b to the magnets 83a to 83d. Distance 92 is shorter than distance 91 . Therefore, the attraction force on the sheet metal member 80b is stronger on the − side in the z-axis direction than on the + side in the z-axis direction, and as a result, the movable member 80 is urged toward the fixed member 86 side.

According to the present embodiment, in the lens side blur correction portion 13a of the lens barrel 2, the strong rolling surface 89 is formed, the number of man-hours for forming the rolling surface 89 is reduced, and the strength of the movable member 80 is reduced. The same effect as in the first embodiment can be obtained in terms of increasing the .

Note that the image blur correction device applied to the lens barrel 2 of this embodiment has at least one feature of the image blur correction device applied to the camera body 1 described as the second to fifth embodiments. may be adopted. Moreover, two or more of the first to fifth embodiments may be appropriately combined as long as there is no contradiction in terms of implementation.

When considering the application target of the present invention, the camera body 1 having the image blur correction function may be regarded as an "imaging device". Also, the present invention may be applied to both the camera body 1 and the lens barrel 2 as blur correction devices.

In each of the embodiments described above, both the camera body 1 and the lens barrel 2 are provided with the blur correction function. When the present invention is applied to the camera body 1 alone, the camera side blur correction section 14 is required. When the present invention is applied to the lens barrel 2 alone, the lens side blur correction section 13a is required. However, when the present invention is applied to a lens-integrated imaging apparatus, the blur correction function may be provided in at least one of the camera body 1 and the lens barrel 2 .

Although the present invention has been described in detail based on its preferred embodiments, the present invention is not limited to these specific embodiments, and various forms without departing from the gist of the present invention can be applied to the present invention. included. Some of the above-described embodiments may be combined as appropriate.

3a blur correction lens 6 imaging element 20, 50, 61, 80 movable member 20b, 50b, 61b, 70, 80b sheet metal member 20a, 50a, 61a, 80a resin portion 26, 85 rolling ball 28, 86 fixed member 30, 89 rolling surface

Claims (10)

a fixing member;
a rolling member;
It has a sheet metal member made of a non-magnetic material and a resin portion integrally molded with the sheet metal member, holds an optical element, and is perpendicular to the optical axis of the optical element with respect to the fixing member via the rolling members. a movable member relatively movable in a direction;
a magnet for driving the movable member in a direction perpendicular to the optical axis;
biasing means for biasing the movable member toward the fixed member in the direction of the optical axis, the biasing means including the magnet and a magnetic portion that is magnetically attracted to the magnet;
The magnetic portion is made of a member different from the sheet metal member and integrally molded with the resin portion,
A portion of the movable member where the sheet metal member is exposed from the resin portion serves as a rolling surface on which the rolling member rolls,
The image blur correction device, wherein the sheet metal member is formed in a shape surrounding the optical element when viewed from the optical axis direction. Another magnet for driving the movable member in a direction perpendicular to the optical axis is provided on the opposite side of the fixed member with the movable member interposed in the optical axis direction,
2. The image blur correction device according to claim 1 , wherein the distance from said magnetic portion to said magnet is shorter than the distance from said magnetic portion to said other magnet. 3. The image blur correction device according to claim 1 , wherein said biasing means includes a spring that engages said fixed member and said movable member. 3. The sheet metal member has a step, and due to the step, a portion of the sheet metal member other than the rolling contact surface is closer to the fixed member in the optical axis direction. 4. The image blur correction device according to any one of 1 to 3 . 5. The image blur correction device according to claim 1, wherein said optical element is fixed to said resin portion of said movable member. a fixing member;
a rolling member;
It has a conductive sheet metal member and a resin portion integrally molded with the sheet metal member, holds an optical element, and is perpendicular to the optical axis of the optical element with respect to the fixing member via the rolling member. a movable member relatively movable in a direction;
The movable member has a conductive member electrically connected to the sheet metal member,
A portion of the movable member where the sheet metal member is exposed from the resin portion serves as a rolling surface on which the rolling member rolls,
The image blur correction device, wherein the sheet metal member is formed in a shape surrounding the optical element when viewed from the optical axis direction. 7. The image blur correction device according to claim 6, wherein the conductive member is electrically connected to the sheet metal member by being fixed to the sheet metal member by a conductive fastening member. The movable member has a cover member arranged to cover the optical element from a side opposite to the fixed member in the optical axis direction,
8. The image blur correction device according to claim 6, wherein the cover member is fixed to the movable member via the conductive member. An imaging device comprising the image blur correction device according to any one of claims 1 to 8 ,
An image pickup apparatus, wherein the optical element in the image blur correction apparatus is an image pickup element that photoelectrically converts an optical image. A lens barrel having the image blur correction device according to any one of claims 1 to 5 ,
A lens barrel, wherein the optical element in the image blur correction device is a lens.

Images