JP7590171B2 - Image blur correction device, lens unit, and imaging device - Google Patents

Description

The present invention relates to an image stabilization device, a lens unit, and an imaging device.

Optical devices such as single-lens reflex cameras are known to have image stabilization devices such as image stabilization mechanisms. Such image stabilization devices usually have a configuration for correcting camera shake, in which a movable part that holds a lens slides relative to a fixed part in a direction intersecting the optical axis of the lens. In addition, such image stabilization devices have a configuration that restricts the movement of the movable part in a direction away from the fixed part along the optical axis to prevent the movable part from detaching from the fixed part along the optical axis.

As a configuration for restricting removal along the optical axis, a configuration for restricting removal of the movable part by inserting a pole in a direction perpendicular to the optical axis direction is known (see, for example, Patent Document 1). Other known configurations include a configuration in which a spring biases the movable part toward the fixed part in the direction along the optical axis, and a configuration in which a cover member that covers the entire circumference of the movable part is placed on the opposite side of the fixed part in the direction along the optical axis (see, for example, Patent Document 2).

JP 2008-275767 A JP 2010-175788 A

However, the above-mentioned conventional techniques have problems in terms of the complexity of the structure. For example, in the structure described in Patent Document 1, in a configuration that restricts the movable part from coming off the fixed part in the direction along the optical axis, a pole is inserted in a direction intersecting the direction along the optical axis. Therefore, a structure is required for inserting and holding the pole in the movable part and the fixed part. In addition, in the structure described in Patent Document 2, a structure is required for bridging the spring between the fixed part and the movable part in order to restrict the movable part from coming off by the bias of a spring. Furthermore, in the structure described in Patent Document 2, the lid member covers the entire circumference of the movable part in the direction along the optical axis, so a structure is required for sufficiently fixing the lid member to the fixed part.

For this reason, the conventional image stabilization device may impose restrictions on the design of the lens unit. For example, the following cases are considered to impose restrictions on the design.
When an optical system is to be adopted in which a lens arranged adjacent to the image stabilization lens in a direction along the optical axis thereof comes extremely close to the image stabilization lens during zooming.
- When you want to reduce the distance between lenses to make the optical system more compact.
When it is necessary to drive a cover member that overlaps the image stabilization lens during zooming.
- When you want to place components of another lens group around the image stabilization lens.

Therefore, there is a demand for an image stabilization device that can prevent the movable part from coming off the fixed part in the direction along the optical axis while reducing structural constraints and constraints on the optical system.

A first object of one embodiment of the present invention is to provide an image stabilization device that has a simple configuration and is capable of preventing a movable part from coming off a fixed part.
A second object of one embodiment of the present invention is to provide a lens unit and an imaging device that can reduce design constraints caused by an image stabilization device.

In order to solve at least the first problem described above, an image stabilization device according to one aspect of the present invention is an image stabilization device having a fixed part, a movable part that holds a lens and is movable relative to the fixed part in a direction intersecting the optical axis of the lens, and a disengagement prevention part that is fixed to the fixed part and prevents the movable part from disengaging from the fixed part in a direction along the optical axis, and only a portion of the circumferential surface of the movable part on the side opposite the fixed part faces the disengagement prevention part.

In addition, in order to solve at least the second problem described above, a lens unit according to one aspect of the present invention has the image stabilization device described above.

Furthermore, in order to solve at least the second problem described above, an imaging device according to one aspect of the present invention has the image stabilization device described above.

According to one aspect of the present invention, it is possible to realize an image stabilization device that can prevent the movable part from coming off the fixed part with a simple configuration.

In addition, according to one aspect of the present invention, it is possible to realize a lens unit and an imaging device that can reduce design constraints caused by an image stabilization device.

1 is a diagram illustrating an optical configuration of an imaging device according to an embodiment of the present invention. 1 is a diagram illustrating a schematic configuration of an image blur correction device according to an embodiment of the present invention. 1 is an exploded perspective view showing a schematic configuration of an image blur correction device according to an embodiment of the present invention; 3 is a cross-sectional view that shows a schematic cross section of the image blur correction device of FIG. 2 taken along line AA. 1 is a perspective view showing a schematic configuration of a fall-prevention portion according to an embodiment of the present invention; FIG. 1 is a cross-sectional view showing a schematic diagram of a state in which a conventional cover member is applied to the image blur correction device of the present embodiment. FIG. 11 is a plan view showing a schematic diagram of a state in which a conventional cover member is applied to the image blur correction device of the present embodiment. FIG. 13 is a cross-sectional view that illustrates a schematic configuration of an image shake correction device according to another embodiment of the present invention, which has a viscoelastic adhesive portion.

[Embodiment 1]
Hereinafter, one embodiment of the present invention will be described in detail.

[Imaging device]
An imaging device according to an embodiment of the present invention has an image stabilization device. The imaging device may be configured in the same manner as a known imaging device, except that it has an image stabilization device described later. The image stabilization device is arranged so as to constitute a part of the optical system of the imaging device, as described in detail later. The imaging device according to an embodiment of the present invention may be an imaging device having a solid-state imaging element, such as a digital camera or a video camera. The imaging device may be a fixed-lens imaging device in which a lens is fixed to the body of the imaging device, or may be a lens-interchangeable imaging device having a detachable lens unit, such as a single-lens reflex camera or a mirrorless single-lens camera. Examples of the imaging device include a single-lens reflex camera, a security camera, and a compact digital camera.

It is more preferable that the imaging device according to this embodiment further includes an image processing unit that electrically processes the captured image data acquired by the imaging element to change the shape of the captured image, and an image correction data storage unit that stores image correction data and an image correction program used to process the captured image data in the image processing unit.

[Lens unit]
A lens unit according to an embodiment of the present invention has an image stabilization device. In this embodiment, the "lens unit" refers to an optical system having one or more lens groups that are movable along an optical axis. The lens group is composed of one or more lens components, and in the case where a plurality of lens components are included, the relative positional relationship between the lens components is fixed. Examples of the lens unit include a zoom lens and a fixed focal length lens. Examples of the lens components include a single lens, a cemented lens in which two or more single lenses are cemented together with no air gap therebetween, and a compound lens in which a single lens is integrated with resin with no air gap therebetween.

Here, an imaging device and a lens unit according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a schematic diagram of the optical configuration of an imaging device according to an embodiment of the present invention. FIG. 1 shows a mirrorless single-lens camera as an example of an imaging device.

As shown in FIG. 1, the mirrorless interchangeable-lens camera 50 has a main body 51 and a lens unit 1 that can be attached to and detached from the main body 51. The lens unit 1 has a lens barrel 2 that can be attached to and detached from the main body 51, a plurality of lenses L housed in the lens barrel 2, and an image stabilization device 10. The lenses L and the image stabilization device 10 are arranged on an optical axis OA. The main body 51 also has a CMOS (Complementary Metal Oxide Semiconductor) image sensor 52 as an imaging element. The CMOS image sensor 52 is an example of an imaging element, and is arranged in the main body 51 at a position where the optical axis OA is the central axis. Note that the imaging element may be a CCD (Charge Coupled Device) sensor in addition to the CMOS image sensor.

Some of the lenses L may form a lens group that is movable along the optical axis OA. For example, the lenses L on the image side (CMOS image sensor 52 side) of the image stabilization device 10 in the lens unit 1 may form a lens group that is movable along the optical axis OA.

[Configuration of Image Shake Correction Device]
Fig. 2 is a diagram showing a schematic configuration of the image blur correction device 10 according to the first embodiment of the present invention. Fig. 3 is an exploded perspective view showing a schematic configuration of the image blur correction device 10 according to the first embodiment of the present invention. Fig. 4 is a diagram showing a schematic cross section of the image blur correction device 10 according to the first embodiment of the present invention taken along line A-A in Fig. 2. As shown in Fig. 2, the image blur correction device 10 has a fixed portion 11, a movable portion 12, and a removal prevention portion 13.

The fixed portion 11 is fixed to the lens barrel 2. The fixed portion 11 is a plate-like member whose shape (hereinafter also referred to as the "planar shape") when viewed in a plane along the optical axis OA is approximately annular. More specifically, the planar shape of the fixed portion 11 is annular with a portion of the outer periphery missing.

The fixed part 11 has protrusions 111 on one of the main surfaces 11A in the planar shape of the fixed part 11, protruding from the outer peripheral edge of the one main surface along the optical axis OA. There are three protrusions 111. Each protrusion 111 is disposed at equally spaced positions in the circumferential direction in the planar shape of the fixed part 11.

3, the fixed part 11 has three yokes 112. The yokes 112 are plate-shaped members made of a magnetic material such as iron, and are fixed to the fixed part 11. The yokes 112 are arranged on the other main surface 11B side in the planar shape of the fixed part 11, and each yoke 112 is arranged at an equal interval in the circumferential direction in the planar shape of the fixed part 11. As shown in FIG. 4, the fixed part 11 has three holes 114 that penetrate the fixed part 11 in the direction along the optical axis. Each hole 114 is arranged in the vicinity of the above-mentioned convex part 111 in the planar shape of the fixed part 11, and is formed at an equal interval in the circumferential direction of the planar shape. A screw 113, which will be described later, is inserted into the hole 114. Furthermore, the fixed part 11 has three coils 115. Each coil 115 is positioned at equal intervals in the circumferential direction of the planar shape of the fixed part 11, and faces the yoke 112 across the fixed part 11.

The movable part 12 is a member having a substantially annular planar shape. More specifically, the movable part 12 has a plate-shaped annular part having a substantially annular planar shape, three protruding parts 121 extending outward from the outer periphery of the annular part along the planar direction, and a cylindrical part surrounding an opening in the center of the annular part and extending from one main surface 12A of the annular part along the optical axis. The annular part, the protruding part 121, and the cylindrical part are integrally molded from resin. The distance from the center of the planar shape of the movable part 12 to the protruding edge of the protruding part 121 is slightly shorter than the radius of the substantially annular shape of the fixed part 11.
A lens 14 is fixed to the protruding edge of the cylindrical portion, and in this manner, the movable portion 12 holds the lens 14 .

The three protrusions 121 are plate-shaped and molded integrally with the movable part 12. They are arranged at equal intervals in the circumferential direction of the planar shape of the movable part 12. A magnet 122 is arranged on the other main surface 12B side of the protrusion 121. Therefore, the three magnets 122 are also arranged at equal intervals in the circumferential direction of the planar shape of the movable part 12.

The protruding portion 121 has an arc-shaped protruding edge that is convex outward in plan view, and has a notch portion 123 formed by cutting out a portion of the protruding edge. Therefore, three notches 123 are also formed in the movable portion 12, and each notch portion 123 is disposed at equal intervals in the circumferential direction of the planar shape of the movable portion 12. The planar shape of the notch portion 123 is approximately U-shaped.

The movable part 12 has three recesses on the other main surface 12B side, and the three recesses are arranged at equal intervals in the circumferential direction of the planar shape of the movable part 12. One rolling element 15 is rotatably housed in each recess. The rolling element 15 is a spherical member and has a diameter slightly larger than the depth of the recess, and a part of the spherical surface of the rolling element 15 housed in the recess protrudes slightly beyond the recess.

The anti-slip portion 13 is fixed to the fixed portion 11. FIG. 5 is a perspective view showing a schematic configuration of the anti-slip portion 13 in the first embodiment of the present invention. As shown in FIG. 5, the anti-slip portion 13 has a shaft portion 131 and a flange portion 132 that extends from one end of the shaft portion 131 in a direction perpendicular to the axial direction of the shaft portion 131.

The shaft portion 131 is a cylindrical body. A female thread that screws onto the screw 113 is formed on the inner peripheral surface of the other end of the cylindrical body. The shaft portion 131 also has an outer diameter that allows the other end to fit inside the aforementioned hole portion 114 (through which the screw 113 can be inserted) of the fixed part 11. Furthermore, the shaft portion 131 has an outer diameter that allows it to be inserted without contact into the notch portion 123 formed in the protruding portion 121 of the movable part 12.

The flange portion 132 is a plate-like member having a planar shape in the shape of a ring. The planar shape of the flange portion 132 has an outer diameter larger than that of the cutout portion 123 of the movable portion 12. The flange portion 132 also has a cutout portion 1321 in which a portion of its outer periphery has been cut out. The planar shape of the cutout portion 1321 is approximately U-shaped, and has dimensions that allow the protrusion portion 111 of the fixed portion 11 to fit into it.

The fixed part 11 faces the movable part 12 on one of its main surfaces 11A. At this time, the three yokes 112 and coil 115 of the fixed part 11 face the three magnets 122 of the movable part 12, and the yoke 112 is attracted to the magnets 122. The positions of the yoke 112 and magnets 122 are adjusted so that they are most attracted to each other when the lens 14 of the movable part 12 is at a desired position on the optical axis OA of the lens unit 1.

The anti-slip portion 13 advances from one main surface 12A of the movable portion 12 toward the fixed portion 11 via the cutout 123. The shaft 131 of the anti-slip portion 13 is inserted into the cutout 123 of the movable portion 12, and the other end of the shaft 131 fits into the aforementioned hole 114 of the fixed portion 11. Furthermore, a screw 113 is inserted into the hole 114 from the other main surface 11B of the fixed portion 11, and the screw 113 screws into a female thread formed at the other end of the inner circumferential surface of the shaft 131. In this way, the anti-slip portion 13 is fixed to the fixed portion 11.

Regarding the anti-slip portion 13, the shaft portion 131 is inserted into the cutout portion 123 of the movable portion 12 with a gap in the direction intersecting the optical axis. The anti-slip portion 13 is fixed to the fixed portion 11 with a slight gap between the flange portion 132 and one of the main surfaces 12B of the movable portion 12 in the direction along the optical axis. The flange portion 132 faces the movable portion 12 at three points in the circumferential direction of the movable portion 12. In this way, only a portion of the circumferential direction of the surface of the movable portion 12 opposite the fixed portion 11 faces the anti-slip portion 13.

The anti-detachment portion 13 is fixed to the fixed portion 11 with the notch 1321 of the flange portion 132 fitted into the protrusion 111 of the fixed portion 11. In this manner, the protrusion 111 of the fixed portion 11 is inserted into the notch 1321 of the anti-detachment portion 13.

The anti-detachment portion 13 is fixed to the fixed portion 11 via the movable portion 12 at three points along the optical axis and in a direction intersecting the optical axis. The shaft portion 131 has gaps with the notch portion 123 of the movable portion 12 in the direction intersecting the optical axis at three points along the optical axis, and the flange portion 132 has a small gap with the movable portion 12 in the direction along the optical axis.

Therefore, the movable part 12 can move relative to the fixed part 11 in a direction intersecting the optical axis by the amount of the gap between the notch part 123 and the shaft part 131.

In addition, the movable part 12 comes into contact with the flange part 132 when it is separated from the fixed part 11 in the direction along the optical axis. In this way, the movable part 12 can be separated from the fixed part 11 in the direction along the optical axis by the amount of the gap between the movable part 12 and the flange part 132.

Moveable part 12 is in contact with fixed part 11 via rolling elements 15 on the other main surface 12B side. Therefore, movable part 12 can move smoothly relative to fixed part 11 in a direction intersecting the optical axis.

[Action and Effect]
The image blur correction device 10 has the above-mentioned slip-off prevention portion 13. That is, since the image blur correction device 10 has a gap between the shaft portion 131 and the notch portion 123, when vibration due to hand shake or the like is applied to the image blur correction device 10, the movable portion 12 can move in a direction intersecting the optical axis relative to the fixed portion 11 accordingly. In addition, the movable portion 12 is attracted to the fixed portion 11 by a magnetic force acting between the magnet 122 and the yoke 112. Therefore, the movable portion 12 is held by the fixed portion 11 so as to be movable to a desired position only in a direction intersecting the optical axis while keeping a constant positional relationship with the fixed portion 11 in a direction along the optical axis. In addition, by energizing the coil 115, the movable portion 12 moves to a desired position only in a direction intersecting the optical axis while keeping a constant positional relationship with the fixed portion 11 in a direction along the optical axis. In this way, the yoke 112, the coil 115, and the magnet 122 constitute an electromagnetic actuator that moves the movable part 12 relative to the fixed part 11 in a direction intersecting the optical axis of the lens, and can quickly and smoothly move the movable part 12. Therefore, the image blur correction device 10 can adjust the optical axis of the entire optical system when subjected to external vibrations of about 10 Hz due to camera shake, for example, and reduce blurring and shaking during image capture.

In addition, only a portion of the circumferential surface of the movable part 12 opposite the fixed part 11 faces the anti-detachment part 13. In this way, movement of the movable part 12 in a direction along the optical axis away from the fixed part 11 is restricted by the flange part 132 of the anti-detachment part 13. Therefore, in the image blur correction device 10, the movable part 12 is prevented from detaching from the fixed part 11 in a direction along the optical axis of the lens 14.

In this embodiment, the prevention of the movable part in the image stabilization device as described above is achieved by a simple configuration of the prevention parts 13 arranged at three points in the circumferential direction. This makes it possible to further miniaturize the image stabilization device. It also makes it possible to more effectively utilize the space around the image stabilization device in the lens unit. This point will be explained with reference to the drawings.

Figures 6 and 7 are diagrams showing the state in which the cover member 101 is applied to the image blur correction device of this embodiment. Figure 6 is a cross-sectional view, and Figure 7 is a plan view. As shown in Figures 6 and 7, the image blur correction device 100 is configured in the same way as the image blur correction device 10 described above, except that the cover member 101 is located in a position suitable for conventional applications. The cover member 101 covers the movable part 12 from the opposite side of the fixed part 11 over the entire circumferential area of the movable part 12.

The lid member 101 covers the entire circumference of the movable part 12, and is therefore clearly larger than the anti-detachment part 13. In addition, the structure for adequately fixing the lid member 101 to the fixed part 11 may also be large. As a result, areas of the space around the movable part 12 and the fixed part 11 are blocked by the installation of the lid member 101.

For example, because the cover member 101 covers the entire circumference of the movable part 12, the tolerance for the assembly precision of the cover member 101 is set to be greater than the tolerance for the assembly precision of the anti-detachment part 13, which is disposed on only a portion of the circumference of the movable part 12. Therefore, as shown in FIG. 6, the cover member 101 is usually disposed at a position farther away from the movable part 12 than the anti-detachment part 13. Therefore, the thickness of the image blur correction device 10 of this embodiment can be made thinner by the distance between one main surface of the cover member 101 and one main surface of the flange part 132 of the anti-detachment part 13 in the direction along the optical axis, i.e., D, compared to the image blur correction device 100 shown in FIG. 5.

7, the cover member 101 covers the entire periphery of the movable part 12 and the fixed part 11. Meanwhile, as shown in FIG. 2, around the image blur correction device 10 of this embodiment, there is formed an area B where neither the fixed part 11 nor the movable part 12 is present, and an area B where the fixed part 11 is present but the movable part 12 is not present. This makes it possible to arrange the lens unit in these areas, or to configure it so that it can enter these areas. For example, in the image blur correction device 10, because area B is wide and thin,
Adopting an optical system in which the lens 14 and another lens disposed adjacent to the lens 14 move closer together during zooming;
Driving components adjacent to the lens 14 in a zooming motion; and
- placing components of other lens groups around the periphery of lens 14;
In this way, the image blur correction device 10 makes it possible to further improve the optical characteristics of the lens unit, or to further reduce the size of the lens unit, compared to a conventional image blur correction device that has the cover member 101.

Furthermore, the anti-detachment portion 13 has a notch portion 1321 in the flange portion 132. Therefore, when fixing the anti-detachment portion 13 to the fixed portion 11, the convex portion 111 of the fixed portion 11 is fitted into the notch portion 1321, which makes it easier to align the anti-detachment portion 13 when fixing it, and also makes it possible to suppress co-rotation when screwing it in.

[Summary of the First Embodiment]
The image blur correction device (10) of this embodiment is an image blur correction device having a fixed part (11), a movable part (12) that holds a lens (14) and is movable relative to the fixed part in a direction intersecting the optical axis, and a fall prevention part (13) that is fixed to the fixed part and prevents the movable part from coming off the fixed part in a direction along the optical axis, where only a portion of the circumferential direction of the surface of the movable part opposite the fixed part faces the fall prevention part. According to this embodiment, it is possible to realize an image blur correction device that can prevent the movable part from coming off the fixed part with a simple configuration.

In this embodiment, the anti-detachment portion has a shaft portion (131) that extends from the fixed portion toward the movable portion in a direction along the optical axis, and a flange portion (132) that extends from the tip of the shaft portion in a direction intersecting the optical axis. This configuration is more effective from the viewpoint of preventing the movable portion from detaching from the fixed portion with a simple configuration.

In this embodiment, the flange portion has a cutout portion (1321) in which a portion of its outer periphery is cut out, and the fixing portion has a protrusion portion (111) that is inserted into the cutout portion. This configuration is more effective in terms of improving the assembly efficiency of the image stabilization device.

In this embodiment, the image blur correction device (10) further includes an electromagnetic actuator (yoke 112, coil 115, and magnet 122) that moves the movable part relative to the fixed part in a direction intersecting the optical axis of the lens. This configuration is more effective in terms of quickly and smoothly moving the movable part 12 relative to the fixed part 11 in a direction intersecting the optical axis.

The lens unit (1) and imaging device (mirrorless single-lens camera 50) of this embodiment have the image stabilization device described above. According to this embodiment, it is possible to realize a lens unit and imaging device that can reduce design constraints caused by the image stabilization device.

[Embodiment 2]
Other embodiments of the present invention will be described below. For ease of explanation, the same reference numerals are given to components having the same functions as those described in the above embodiment, and the description thereof will not be repeated.

[Configuration of Image Shake Correction Device]
8 is a cross-sectional view showing a schematic configuration of an image blur correction device 20 according to an embodiment of the present invention. As shown in FIG. 8, the image blur correction device 20 has substantially the same structure as the image blur correction device 10 described above, except that the image blur correction device 20 further includes a viscoelastic adhesive portion 26.

The viscoelastic adhesive portion 26 is a member having viscoelasticity and adhesive properties. The viscoelastic adhesive portion 26 is interposed between the movable portion 12 and the flange portion 132, and abuts against the movable portion 12 and the flange portion 132.

The material constituting the viscoelastic adhesive portion 26 may have viscoelasticity and adhesiveness. Examples of the material constituting the viscoelastic adhesive portion 26 include ultraviolet curing gel, silicone gel, butyl rubber, and elastomer. The material constituting the viscoelastic adhesive portion 26 may also be a commercially available product. Examples of commercially available materials include the Hanenite series (Naigai Rubber Co., Ltd., "Hanenight" is a registered trademark of the company), the Miyafreak series (Miyasaka Rubber Co., Ltd.), TB3168 (ThreeBond Co., Ltd.), and the αGEL series (Taica Corporation, "αGEL" is a registered trademark of the company). The shape of the viscoelastic adhesive portion 26 may be a shape that can exhibit sufficient adhesiveness and viscoelasticity that sufficiently allows the movement of the movable portion 12 when interposed between the flange portion 132 and the movable portion 12. Examples of the shape of the viscoelastic adhesive portion 26 include a ball shape, a washer shape, and a sleeve shape.

The viscoelasticity of the viscoelastic adhesive portion 26 can be adjusted appropriately according to the configuration and characteristics related to the attenuation of vibration of the optical axis of the entire optical system. For example, the viscoelasticity of the viscoelastic adhesive portion 26 may be determined according to the size of the gap between the movable portion 12 and the flange portion 132 where the viscoelastic adhesive portion 26 should be interposed, the weight of the movable portion 12, the weight of the image blur correction device 20 and the lens unit as a characteristic related to the vibration frequency of an external impact, or the focal range of the lens unit as a characteristic related to the allowable strength of camera shake, etc.

More specifically, the viscoelasticity of the viscoelastic adhesive portion 26 may be adjusted so as to not substantially affect vibration frequencies of about 10 Hz or less, and to attenuate vibration frequencies of 100 Hz or more that become disturbances during imaging, so as to appropriately deal with image blurring due to camera shake. In addition, the viscoelasticity of the viscoelastic adhesive portion 26 may be adjusted appropriately according to the dimensions of the viscoelastic adhesive portion. For example, when the viscoelastic adhesive portion 26 has a shape as described above, the viscoelasticity of the viscoelastic adhesive portion 26 may be adjusted appropriately according to the dimensions of the viscoelastic adhesive portion 26 in such a shape.

[Action and Effect]
This embodiment has the same effect as the above-described first embodiment in that it is possible to prevent the movable part 12 from coming off the fixed part 11 with a simple configuration. That is, when an external impact due to hand shake or the like is applied to the image blur correction device 20, the movable part 12 moves relative to the fixed part 11 in a direction along the optical axis or a direction intersecting the optical axis, as described above for the first embodiment, but the separation of the movable part 12 from the fixed part 11 in the direction along the optical axis is restricted by the fall-off prevention part 13.

In this embodiment, a viscoelastic adhesive portion 26 is further provided between the anti-detachment portion 13 and the movable portion 12. Therefore, in this embodiment, the above-mentioned movement and separation of the movable portion 12 due to an external impact is attenuated by the viscoelasticity and adhesiveness of the viscoelastic adhesive portion 26.

In general, in cameras, particularly in interchangeable lens cameras of the single-lens type, vibrations during shutter operation can cause disturbances, causing the image stabilization device to operate unexpectedly. Conventional image stabilization devices can also react to vibrations other than camera shake, which can affect image capture. For this reason, an image stabilization device capable of correcting only camera shake is desired. For image stabilization devices applied to the correction of such camera shake, a camera shake correction mechanism including a simple configuration in which gel is sealed in the gap between a fixed part and a movable part has been considered. For such simple camera shake correction mechanisms, a configuration is known in which a rod-shaped member extending from a movable part is inserted into gel (gel pool) injected into a hole in which ultraviolet-curable gel is sealed in the fixed part, and viscous resistance generated between the gel and the rod-shaped member is utilized. However, this configuration has the following problems.
The need to provide a gel pool increases the size of the image stabilization device.
- Once the gel has hardened, it is nearly impossible to disassemble or clean for repairs.
A separate window must be provided for UV irradiation, which places constraints on the design of the image stabilization device.

In contrast, the image blur correction device 20 according to this embodiment has the above-mentioned removal prevention portion 13 and viscoelastic adhesive portion 26. The viscoelastic adhesive portion 26 is interposed between the movable portion 12 and the flange portion 132, and exhibits viscoelasticity and adhesiveness. Therefore, movement of the movable portion 12 relative to the fixed portion 11 in a direction along the optical axis of the lens 14 and in a direction intersecting the optical axis are both attenuated by the viscoelastic adhesive portion 26. Therefore, the following effects are achieved.
Since the gap between the movable part 12 and the flange part 132 is utilized, there is no need to provide a dedicated gel reservoir.
During assembly, the gel is simply applied or placed in the gap between the movable portion 12 and the flange portion 132, so even if the gel hardens once, it can be disassembled and cleaned for repairs.
- There is no need to install a separate window for irradiating the gel with UV light.

As is clear from the above description, in this embodiment, the image stabilization device (20) further includes a viscoelastic adhesive portion (26) having viscoelasticity, which is interposed between the movable portion (12) and the flange portion (132). This embodiment is more effective in terms of further attenuating vibrations of the image stabilization device caused by external impacts.

[Modifications]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in the different embodiments are also included in the technical scope of the present invention.

For example, in the second embodiment, if the viscoelastic adhesive portion 26 has appropriate viscoelasticity and adhesiveness and can fully exhibit the restoring ability to return the movable portion 12 to the intended position relative to the fixed portion 11, the viscoelastic adhesive portion 26 can also exhibit the function of restoring the position of the movable portion 12 relative to the optical axis in the image blur correction device of the present invention. In the embodiment of the present invention, the magnetic force of the magnet 122 is used to restore the movable portion 12 to its position relative to the optical axis, but if the viscoelastic adhesive portion 26 has the above-mentioned restoring ability, the image blur correction device in the embodiment of the present invention does not need to have the yoke 112. In this case, it is preferable that the viscoelastic adhesive portion 26 has a high restoring ability in the direction along the optical axis and a low restoring ability in the direction perpendicular to the optical axis from the viewpoint of suppressing an increase in unnecessary load during the operation of the movable portion. In order to exhibit such restoring ability, a viscoelastic adhesive portion having a large contact area in the direction along the optical axis is preferable, and for example, a washer-shaped viscoelastic adhesive portion is preferable.

REFERENCE SIGNS LIST 1 Lens unit 2 Lens barrel 10, 20, 100 Image blur correction device 11 Fixed portion 11A, 12A One main surface 11B, 12B Other main surface 12 Movable portion 13 Anti-dislodgement portion 14, L Lens 15 Rolling body 26 Viscoelastic adhesive portion 50 Mirrorless single-lens camera (imaging device)
51 Main body 52 CMOS image sensor 101 Cover member 111 Convex portion 112 Yoke 113 Screw 114 Hole portion 115 Coil 121 Protrusion portion 122 Magnet 123, 1321 Notch portion 131 Shaft portion 132 Flange portion OA Optical axis

Claims (8)

an image blur correction device having a fixed part, a movable part that holds a lens and is movable relative to the fixed part in a direction intersecting an optical axis of the lens, and a disengagement prevention part that is fixed to the fixed part and abuts against the movable part to prevent the movable part from disengaging from the fixed part in a direction along the optical axis,
Only a portion of a circumferential surface of the movable portion opposite the fixed portion faces the stopper portion,
The stopper portion is
a shaft portion extending from the fixed portion toward the movable portion in a direction along the optical axis;
a flange portion extending from a tip of the shaft portion along a direction intersecting the optical axis;
It has
The anti-detachment portion prevents the movable portion from coming off the fixed portion in a direction along the optical axis by the flange portion abutting against the movable portion . The flange portion has a cutout portion in which a part of an outer periphery thereof is cut out,
The fixing portion has a protrusion to be inserted into the notch portion.
The image blur correction device according to claim 1 . an image stabilization device having a fixed portion, a movable portion that holds a lens and is movable relative to the fixed portion in a direction intersecting an optical axis of the lens, and a stopper portion that is fixed to the fixed portion and prevents the movable portion from coming off the fixed portion in a direction along the optical axis,
Only a portion of a circumferential surface of the movable portion opposite the fixed portion faces the stopper portion,
The stopper portion is
a shaft portion extending from the fixed portion toward the movable portion in a direction along the optical axis;
a flange portion extending from a tip of the shaft portion along a direction intersecting the optical axis;
It has
The flange portion has a cutout portion in which a part of an outer periphery thereof is cut out,
The fixed portion has a protrusion that is inserted into the notch. The image blur correction device according to claim 3 , further comprising a viscoelastic adhesive portion interposed between the movable portion and the flange portion and having viscoelasticity. an image stabilization device having a fixed portion, a movable portion that holds a lens and is movable relative to the fixed portion in a direction intersecting an optical axis of the lens, and a stopper portion that is fixed to the fixed portion and prevents the movable portion from coming off the fixed portion in a direction along the optical axis,
Only a portion of a circumferential surface of the movable portion opposite the fixed portion faces the stopper portion,
The stopper portion is
a shaft portion extending from the fixed portion toward the movable portion in a direction along the optical axis;
a flange portion extending from a tip of the shaft portion along a direction intersecting the optical axis;
It has
The image blur correction device further comprises a viscoelastic adhesive portion interposed between the movable portion and the flange portion and having viscoelasticity. 6. The image blur correction device according to claim 1 , further comprising an electromagnetic actuator that moves the movable portion relative to the fixed portion in a direction intersecting an optical axis of the lens. A lens unit comprising the image blur correction device according to any one of claims 1 to 6 . An imaging apparatus comprising the image blur correction device according to any one of claims 1 to 6 .

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