Shake correction device, lens unit, and image pickup device

Abstract

To achieve a camera shake correction device, a lens unit, and an image pickup device capable of preventing a movable section from separating from a fixed section with a simplified structure. The solution is that the camera shake correction device (10) has a fixed section (11), a movable section (12) that holds a lens (14), and a separation preventing section (13) that is fixed to the fixed section (11) and restricts the movable section (12) from separating from the fixed section in a direction along an optical axis. Only a portion of a periphery of a surface of the movable section (12) on an opposite side to the fixed section (11) opposes the separation preventing section (13).

Description

Technical Field

[0001] This invention relates to image shake correction devices, lens units, and imaging devices. Background Technology

[0002] In optical devices such as SLR cameras, it is known that optical devices have image shake correction mechanisms or similar devices. These image shake correction devices typically have a structure that allows a movable part of a holding lens to slide relative to a fixed part in a direction intersecting the optical axis of the lens, serving as a structure for correcting hand shake. Furthermore, to prevent the movable part from detaching from the fixed part along the optical axis, the image shake correction device has a structure that restricts the movement of the movable part away from the fixed part along the optical axis.

[0003] In such a structure that restricts the movement of the movable part from detaching along the optical axis, it is known to restrict the detachment of the movable part by inserting a locking pin in a direction perpendicular to the optical axis (see, for example, Patent Document 1). Furthermore, in this structure, it is known to have a structure in which a spring applies force to the movable part toward the fixed part in the direction along the optical axis, and a structure in which a cover member is disposed on the opposite side of the fixed part in the direction along the optical axis, covering the entire circumference of the movable part (see, for example, Patent Document 2).

[0004] Prior art literature

[0005] Patent documents

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2008-275767

[0007] [Patent Document 2] Japanese Patent Application Publication No. 2010-175788 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] However, the prior art described above has problems from the perspective of structural complexity. For example, in the structure described in Patent Document 1, a locking pin is inserted in a direction intersecting the optical axis to restrict the movable part from detaching from the fixed part. Therefore, a structure for inserting and retaining the locking pin is required in both the movable and fixed parts. Furthermore, in the structure described in Patent Document 2, the detachment of the movable part is restricted by the force of a spring, thus a structure for mounting the spring is required in both the fixed and movable parts. Moreover, in the structure described in Patent Document 2, the cover member covers the entire circumference of the movable part in the optical axis direction, thus a structure for fully fixing the cover member to the fixed part is required.

[0010] Therefore, traditional image correction devices sometimes constrain the design of lens units. For example, one can imagine design constraints arising in the following situations.

[0011] • In cases where an optical system is desired, a lens positioned next to the image stabilization lens along the optical axis is extremely close to the image stabilization lens during zooming.

[0012] • Situations where you want to reduce the distance between lenses to miniaturize the optical system.

[0013] • Situations where a cover component overlapping with a lens used for image correction needs to be driven during zooming.

[0014] • A situation where it is desirable to place other lens groups around the lens used for hand shake correction.

[0015] Therefore, there is a need for an image jitter correction device that reduces structural constraints and limitations on the optical system, and that can prevent the movable part from detaching from the fixed part in the direction along the optical axis.

[0016] One aspect of the present invention is to realize an image jitter correction device that can prevent the movable part from detaching from the fixed part with a simplified structure as the first objective.

[0017] Another aspect of the present invention is to achieve a lens unit and imaging device that can alleviate the constraints caused by the design of image shake correction devices as a second objective.

[0018] Methods for solving problems

[0019] To at least solve the first problem mentioned above, one aspect of the present invention relates to an image jitter correction device comprising: a fixed portion; a movable portion holding a lens and capable of moving relative to the fixed portion in a direction intersecting the optical axis of the lens; and an anti-detachment portion fixed to the fixed portion, restricting the movable portion from detaching from the fixed portion in a direction along the optical axis; only a portion of the circumferential direction of the surface of the movable portion opposite to the fixed portion is opposed to the anti-detachment portion.

[0020] In addition, in order to at least solve the second problem mentioned above, one aspect of the present invention relates to a lens unit having the image shake correction device described above.

[0021] Furthermore, in order to at least solve the second problem mentioned above, one aspect of the present invention relates to a camera device having the aforementioned image shake correction device.

[0022] Invention Effects

[0023] According to one aspect of the present invention, an image jitter correction device is available that can prevent the movable part from detaching from the fixed part with a simplified structure.

[0024] Furthermore, according to one aspect of the present invention, it is possible to realize a lens unit and a camera device that can alleviate the constraints caused by the design of image shake correction devices. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the structure of the optical properties of a camera device according to one embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram illustrating the structure of a jitter correction device according to one embodiment of the present invention.

[0027] Figure 3 This is an exploded perspective view schematically illustrating the structure of a jitter correction device according to one embodiment of the present invention.

[0028] Figure 4 It schematically represents that along line AA... Figure 2 A cross-sectional view of the image cut off by the jitter correction device.

[0029] Figure 5 This is a perspective view schematically illustrating the structure of the anti-detachment part in one embodiment of the present invention.

[0030] Figure 6 This is a schematic cross-sectional view showing the state of a conventional cover component applied to the image shake correction device of this embodiment.

[0031] Figure 7 This is a plan view schematically showing the state of a conventional cover component to which the image shake correction device of this embodiment is applied.

[0032] Figure 8 This is a schematic cross-sectional view illustrating the structure of a jitter correction device according to another embodiment of the present invention, which has a viscoelastic adhesive portion.

[0033] Explanation of reference numerals in the attached figures

[0034] 1 Lens Unit

[0035] 2. Lens tube

[0036] 10, 20, 100 image jitter correction device

[0037] 11 Fixing part

[0038] 11A and 12A are the main faces of one side.

[0039] 11B, 12B The other side's main face

[0040] 12 movable parts

[0041] 13 Anti-hair loss section

[0042] 14. L-shaped lens

[0043] 15 Rotating bodies

[0044] 26 Viscoelastic adhesive portion

[0045] 50 Mirrorless Single-Lens Camera (Video Recording Device)

[0046] 51 Main Body

[0047] 52 CMOS image sensor

[0048] 101 Cover Component

[0049] 111 convex part

[0050] 112 Magnetic Yoke

[0051] 113 screws

[0052] 114 Hole

[0053] 115 coil

[0054] 121 Protrusion

[0055] 122 magnets

[0056] 123, 1321 Gap section

[0057] 131 Shaft

[0058] 132 Flange portion

[0059] OA optical axis Detailed Implementation

[0060] [Implementation Method 1]

[0061] The following describes one embodiment of the present invention in detail.

[0062] [Camera device]

[0063] The imaging device according to embodiments of the present invention includes an image shake correction device. This imaging device, except for the image shake correction device described later, can be configured similarly to known imaging devices. The image shake correction device is configured as part of the optical system constituting the imaging device, as detailed below. The imaging device in embodiments of the present invention can be an imaging device with a solid-state imaging element, such as a digital camera or a camcorder. Alternatively, the imaging device can be a fixed-lens imaging device where the lens is fixed to the main body of the imaging device, or a replaceable-lens imaging device, such as an SLR camera or a mirrorless single-lens reflex camera, with a freely detachable lens unit. Examples of such imaging devices include SLR cameras, surveillance cameras, and compact digital cameras.

[0064] The imaging apparatus according to this embodiment more preferably includes: an image processing unit that performs electrical processing on the image data acquired by the imaging element to change the shape of the image, and an image correction data holding unit that holds image correction data and image correction program used for processing the image data in the image processing unit.

[0065] [Lens Unit]

[0066] The lens unit according to embodiments of the present invention has an image shake correction device. In this embodiment, a "lens unit" refers to an optical system having one or more lens groups capable of moving along the optical axis. The lens group is composed of one or more lens elements, and when multiple lens elements are included, the relative positional relationship between the lens elements is fixed. Examples of lens units include zoom lenses and monofocal lenses. Examples of lens elements include: a single lens, a combined lens formed by joining two or more single lenses together without an air gap, and a composite lens formed by integrating a single lens with resin without an air gap.

[0067] The accompanying drawings illustrate the imaging device and lens unit according to embodiments of the present invention. Figure 1 This is a schematic diagram illustrating the structure of the optical properties of a camera device according to one embodiment of the present invention. Figure 1 This illustrates a mirrorless single-lens camera as an example of a camera device.

[0068] like Figure 1As shown, the mirrorless single-lens camera 50 has a main body 51 and a lens unit 1 that can be detached from the main body 51. The lens unit 1 has a lens barrel 2 that can be detached from the main body 51, a plurality of lenses L housed in the lens barrel 2, and an image shake correction device 10. The lenses L and the image shake correction device 10 are arranged on the optical axis OA. In addition, the main body 51 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, which is arranged in the main body 51 at a position where the optical axis OA is its central axis. In addition to the CMOS image sensor, the imaging element may also be a CCD (Charge Coupled Device) sensor.

[0069] A portion of the multiple lenses L can also form a lens group that can move along the optical axis OA. For example, the lens L of the image shake correction device 10 on the image side (CMOS image sensor 52 side) in the lens unit 1 can also form a lens group that can move along the optical axis OA.

[0070] [Structure like a jitter correction device]

[0071] Figure 2 This is a schematic diagram illustrating the structure of the image jitter correction device 10 according to Embodiment 1 of the present invention. Figure 3 This is an exploded perspective view schematically illustrating the structure of the image jitter correction device 10 according to Embodiment 1 of the present invention. Figure 4 It is a schematic representation of along Figure 2 The diagram shows a cross-section of the image jitter correction device 10 according to Embodiment 1 of the present invention, cut by the AA line. Figure 2 As shown, the vibration correction device 10 has a fixed part 11, a movable part 12, and an anti-detachment part 13.

[0072] The fixing part 11 is fixed to the lens barrel 2. The fixing part 11 is a plate-shaped component with a generally annular shape when viewed in a plane along the optical axis OA (hereinafter also referred to as "planar shape"). More specifically, the planar shape of the fixing part 11 is a shape formed by missing a portion of the outer periphery of the annular shape.

[0073] The fixing part 11 has a protrusion 111 on one of its main surfaces 11A in the planar shape of the fixing part 11, which protrudes along the optical axis OA from the outer periphery of that main surface. There are three protrusions 111. Each protrusion 111 is arranged at equally spaced positions in the circumferential direction in the planar shape of the fixing part 11.

[0074] In addition, such as Figure 3As shown, the fixing part 11 has three magnetic yokes 112. Each magnetic yoke 112 is a plate-shaped component made of a magnetic material such as iron, and is fixed relative to the fixing part 11. The magnetic yokes 112 are arranged on the main surface 11B side of the planar shape of the fixing part 11, and each magnetic yoke 112 is arranged at equally spaced positions in the circumferential direction of the planar shape of the fixing part 11. Furthermore, as... Figure 4 As shown, the fixing part 11 has three holes 114 extending through it in the direction along the optical axis. Each hole 114 is positioned near the aforementioned protrusion 111 in the planar shape of the fixing part 11, and is formed at equal intervals in the circumferential direction of the planar shape. A screw 113, described later, is inserted into each hole 114. Furthermore, the fixing part 11 has three coils 115. Each coil 115 is positioned at equal intervals in the circumferential direction of the planar shape of the fixing part 11, and faces the magnetic yoke 112 across the fixing part 11.

[0075] The movable part 12 is a planar component with a generally annular shape. More specifically, the movable part 12 has: a plate-shaped annular portion with a generally annular planar shape; three protrusions 121 extending outward along the planar direction from the outer periphery of the annular portion; and a cylindrical portion surrounding an opening in the center of the annular portion and extending along the optical axis from one of the main surfaces 12A of the annular portion. The annular portion, the protrusions 121, and the cylindrical portion 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 protrusion 121 is slightly shorter than the radius of the generally annular shape of the fixed part 11. A lens 14 is fixed to the protruding edge of the cylindrical portion, thus the movable part 12 holds the lens 14.

[0076] The three protrusions 121 are plate-shaped and integrally formed with the movable part 12. The three protrusions 121 are arranged at equal intervals in the circumferential direction of the planar shape of the movable part 12. A magnet 122 is disposed on the main surface 12B side of the other protrusion 121. Thus, the three magnets 122 are also arranged at equal intervals in the circumferential direction of the planar shape of the movable part 12.

[0077] Furthermore, the protrusion 121 has an outwardly convex arc-shaped protruding end edge, and a notch 123 having a portion notch of this protruding end edge. Therefore, three notches 123 are also formed on the movable part 12, and each notch 123 is arranged at equal intervals in the circumferential direction of the planar shape of the movable part 12. The planar shape of the notch 123 is approximately U-shaped.

[0078] The movable part 12 has three recesses on the other main surface 12B side, which are equally spaced in the circumferential direction of the planar shape of the movable part 12. Each recess rotatably accommodates a rotating body 15. The rotating body 15 is a spherical component with a diameter slightly larger than the depth of the recess, and a portion of the spherical surface of the rotating body 15 accommodated in the recess protrudes slightly beyond the recess.

[0079] The anti-detachment part 13 is fixed relative to the fixing part 11. Figure 5 This is a perspective view schematically illustrating the structure of the anti-detachment part 13 in Embodiment 1 of the present invention. (See attached image.) Figure 5 As shown, the anti-detachment part 13 has a shaft part 131 and a flange part 132 extending from one end of the shaft part 131 in a direction orthogonal to the axial direction of the shaft part 131.

[0080] The shaft portion 131 is a cylindrical body. An internal thread is formed on the inner circumferential surface of the other end of the cylindrical body to engage with the screw 113. Furthermore, this other end of the shaft portion 131 has an outer diameter that is fitted into the aforementioned hole 114 (through which the screw 113 can be inserted) in the fixing portion 11. Moreover, the shaft portion 131 has an outer diameter that allows it to be inserted non-contactly into the notch 123 formed in the protrusion 121 of the movable portion 12.

[0081] The flange portion 132 is a plate-shaped component with a planar annular shape. The planar shape of the flange portion 132 has an outer diameter larger than that of the notch portion 123 of the movable portion 12. In addition, the flange portion 132 has a notch portion 1321 that is a portion of its outer periphery notch. The planar shape of the notch portion 1321 is generally U-shaped and has a size that allows the protrusion 111 of the fixing portion 11 to fit into it.

[0082] The fixed part 11 faces the movable part 12 on its main surface 11A. At this time, the three magnetic yokes 112 and the coil 115 of the fixed part 11 face the three magnets 122 of the movable part 12 respectively, and the magnetic yokes 112 are attracted by the magnets 122. In addition, the positions of the magnetic yokes 112 and the magnets 122 are each adjusted so that they attract each other most when the lens 14 of the movable part 12 is located at a desired position on the optical axis OA of the lens unit 1.

[0083] The anti-detachment part 13 extends from the main surface 12A side of one of the movable parts 12 toward the fixing part 11 via the notch 123. The shaft portion 131 of the anti-detachment part 13 is inserted through the notch 123 of the movable part 12, and the other end of the shaft portion 131 is fitted into the aforementioned hole 114 of the fixing part 11. Furthermore, a screw 113 is inserted into the hole 114 from the other main surface 11B side of the fixing part 11, and the screw 113 is threadedly engaged with the internal thread formed in the other end of the inner circumferential surface of the shaft portion 131. In this way, the anti-detachment part 13 is fixed to the fixing part 11.

[0084] The shaft portion 131 of the anti-slip part 13 is inserted into the notch portion 123 of the movable part 12 with a gap in the direction intersecting the optical axis. Furthermore, with the flange portion 132 having a certain gap relative to one of the main surfaces 12B of the movable part 12 in the direction along the optical axis, the anti-slip part 13 is fixed relative to the fixed part 11. Additionally, the flange portion 132 is opposed to the movable part 12 at three points in the circumferential direction. In this way, only a portion of the circumferential direction of the surface of the movable part 12 opposite to the fixed part 11 is opposed to the anti-slip part 13.

[0085] Furthermore, the anti-detachment part 13 is fixed to the fixing part 11 when the notch 1321 of the flange part 132 is engaged with the protrusion 111 of the fixing part 11. In this way, the protrusion 111 of the fixing part 11 is inserted into the notch 1321 of the anti-detachment part 13.

[0086] The anti-detachment part 13 is fixed to the fixing part 11 at three points along the optical axis and in the direction intersecting the optical axis, with the movable part 12 as a secondary component. The shaft part 131 has gaps relative to the notch 123 of the movable part 12 in the direction intersecting the optical axis at three points, and the flange part 132 has a small gap relative to the movable part 12 in the direction along the optical axis.

[0087] Therefore, the movable part 12 can move relative to the fixed part 11 in a direction intersecting the optical axis by an amount equivalent to the gap between the notch part 123 and the shaft part 131.

[0088] Furthermore, when the movable part 12 separates from the fixed part 11 in the direction along the optical axis, it abuts against the flange part 132. In this way, the movable part 12 can disengage from the fixed part 11 in the direction along the optical axis by an amount equivalent to the gap between it and the flange part 132.

[0089] Furthermore, the movable part 12 contacts the fixed part 11 via the rotating body 15 on the other main surface 12B side. As a result, the movable part 12 can move smoothly relative to the fixed part 11 in a direction intersecting the optical axis.

[0090] [Effects]

[0091] Image shake correction device 10 has the anti-detachment portion 13 as described above. That is, image shake correction device 10 has a gap between shaft portion 131 and notch portion 123, so when vibrations caused by hand tremors or the like are applied to image shake correction device 10, movable portion 12 can move relative to fixed portion 11 in a direction intersecting the optical axis. Furthermore, movable portion 12 is attracted by fixed portion 11 by the magnetic force acting between magnet 122 and yoke 112. Therefore, movable portion 12 is held by fixed portion 11 in such a way that it can move only to a desired position in the direction intersecting the optical axis while maintaining a certain positional relationship relative to fixed portion 11 along the optical axis. Additionally, by energizing coil 115, movable portion 12, while maintaining a certain positional relationship relative to fixed portion 11 along the optical axis, moves only to the desired position in the direction intersecting the optical axis. In this way, the yoke 112, coil 115, and 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, enabling the movable part 12 to move quickly and smoothly. As a result, the shake correction device 10 can adjust the optical axis of the entire optical system when subjected to external vibrations of up to 10 Hz caused by hand tremors, thereby reducing blur and shake during imaging.

[0092] Furthermore, only a portion of the circumferential direction of the surface of the movable part 12 opposite to the fixed part 11 is opposed to the anti-detachment part 13. In this way, the movement of the movable part 12 in the direction of detachment from the fixed part 11 along the optical axis is restricted by the flange 132 of the anti-detachment part 13. Thus, in the image jitter correction device 10, the movable part 12 is prevented from detaching from the fixed part 11 in the direction along the optical axis of the lens 14.

[0093] In this embodiment, the anti-detachment of the movable part in the image shake correction device described above is achieved through a simplified structure with anti-detachment parts 13 arranged at three locations in the circumferential direction. Therefore, the image shake correction device can be further miniaturized. Furthermore, the space surrounding the image shake correction device in the lens unit can be utilized more effectively. This point will be explained with reference to the accompanying drawings.

[0094] Figure 6 and Figure 7 This diagram shows the state in which the cover component 101 is applied to the image shake correction device of this embodiment. Figure 6 It is a cross-sectional view. Figure 7 It's a floor plan. For example... Figure 6 and Figure 7 As shown, the image shake correction device 100 is configured similarly to the image shake correction device 10 described above, except that it has a cover member 101 in a position suitable for conventional use. The cover member 101 covers the movable part 12 from the opposite side of the fixed part 11 in the entire circumferential area of ​​the movable part 12.

[0095] Since the cover member 101 covers the entire circumference of the movable part 12, it is significantly larger than the anti-detachment part 13. Moreover, the structure for fully securing the cover member 101 to the fixing part 11 is sometimes also large. As a result, an area is created in the space around the movable part 12 and the fixing part 11 that is blocked by the cover member 101.

[0096] For example, since the cover member 101 covers the entire circumference of the movable part 12, the allowable range of assembly accuracy for the cover member 101 is set larger than the allowable range of assembly accuracy for the anti-detachment part 13, which is only located at a portion of the circumference of the movable part 12. Therefore, as Figure 6 As shown, the cover member 101 is typically positioned further from the movable part 12 than the anti-slip part 13. Therefore, the thickness of the image shake correction device 10 in this embodiment is... Figure 5 Compared to the shake correction device 100 shown, the distance D between one of the main surfaces of the cover member 101 and one of the main surfaces of the flange portion 132 of the anti-detachment portion 13 along the optical axis direction can be reduced.

[0097] In addition, such as Figure 7 As shown, the cover member 101 covers the periphery of both the movable part 12 and the fixed part 11. On the other hand, as... Figure 2 As shown, around the image shake correction device 10 of this embodiment, there are regions B where neither the fixed part 11 nor the movable part 12 exists, and regions B where the fixed part 11 exists but the movable part 12 does not exist. Therefore, a structure in which the lens unit is arranged can be configured in these regions, or a structure in which the lens unit can be configured can enter these regions. For example, because the image shake correction device 10 has a large region B and a thin thickness, it can achieve:

[0098] • An optical system that uses lens 14 and other lenses arranged adjacent to lens 14 to be closer together during zooming;

[0099] • Drives the components adjacent to lens 14 during zooming; and

[0100] • A component that arranges other lens groups around lens 14.

[0101] In this way, the image shake correction device 10 can further improve the optical characteristics of the lens unit or further miniaturize the lens unit compared with the conventional image shake correction device with the cover member 101.

[0102] Furthermore, the anti-detachment part 13 has a notch 1321 in the flange part 132. Therefore, when the anti-detachment part 13 is fixed to the fixing part 11, by fitting the protrusion 111 of the fixing part 11 into the notch 1321, it is easy to align the anti-detachment part 13 during fixing, and it can also suppress rotation when tightening the screw.

[0103] [Summary of Implementation Method 1]

[0104] The image shake correction device (10) of this embodiment includes: a fixed part (11); a movable part (12) that holds the lens (14) and is movable relative to the fixed part in a direction intersecting the optical axis; and an anti-detachment part (13) that is fixed to the fixed part and restricts the movable part from detaching from the fixed part in the direction along the optical axis, wherein only a portion of the circumferential direction of the surface of the movable part opposite to the fixed part faces the anti-detachment part. According to this embodiment, an image shake correction device that can prevent the movable part from detaching from the fixed part with a simplified configuration can be realized.

[0105] In this embodiment, the anti-detachment part includes: a shaft portion (131) extending from the fixed portion toward the movable portion in a direction along the optical axis; and a flange portion (132) extending from the front end of the shaft portion in a direction intersecting the optical axis. From the viewpoint of preventing the movable portion from detaching from the fixed portion with a simple structure, this structure is more effective.

[0106] In this embodiment, the flange portion has a notch (1321) with a portion of its outer periphery notched, and the fixing portion has a protrusion (111) that is inserted into the notch. From the viewpoint of improving the assembly efficiency of devices such as vibration correction devices, this structure is more efficient.

[0107] In this embodiment, the jitter correction device (10) also 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. From the viewpoint of enabling the movable part 12 to move rapidly and smoothly relative to the fixed part 11 in a direction intersecting the optical axis, this structure is more efficient.

[0108] The lens unit (1) and imaging device (mirrorless single-lens camera 50) of this embodiment have the image shake correction device described above. According to this embodiment, a lens unit and imaging device that can alleviate the limitations caused by the design of the image shake correction device can be realized.

[0109] [Implementation Method 2]

[0110] Other embodiments of the present invention will be described below. Furthermore, for ease of explanation, components having the same function as those described in the above embodiments will be labeled with the same reference numerals and will not be described again.

[0111] [Structure like a jitter correction device]

[0112] Figure 8 This is a cross-sectional view schematically illustrating the structure of a jitter correction device 20 according to one embodiment of the present invention. Figure 8 As shown, the image shake correction device 20 has the same structure as the image shake correction device 10 described above, except that it also has a viscoelastic adhesive portion 26.

[0113] The viscoelastic adhesive portion 26 is a component that has viscoelasticity and adhesiveness. The viscoelastic adhesive portion 26 is located between the movable portion 12 and the flange portion 132, and abuts against the movable portion 12 and the flange portion 132.

[0114] The material constituting the viscoelastic adhesive portion 26 only needs to possess both viscoelasticity and adhesiveness. Examples of materials constituting the viscoelastic adhesive portion 26 include UV-curable gels, silicone gels, butyl rubber, and elastomers. Alternatively, the material constituting the viscoelastic adhesive portion 26 can also be a commercially available product. Examples of such commercially available materials include the Hanenite series (manufactured by Naiwai Rubber Co., Ltd., "Hanenite" is a registered trademark of the company), the Miyafreq series (manufactured by Miyasaka Rubber Co., Ltd.), TB3168 (manufactured by ThreeBond Co., Ltd.), and the αGEL series (manufactured by Taiko Co., Ltd., "αGEL" is a registered trademark of the company). The shape of the viscoelastic adhesive portion 26 only needs to exhibit sufficient adhesiveness and viscoelasticity sufficient to allow the movable portion 12 to move when it is located between the flange portion 132 and the movable portion 12. Examples of the shape of the viscoelastic adhesive portion 26 include a spherical shape, a washer shape, and a sleeve shape.

[0115] The viscoelasticity of the viscoelastic adhesive portion 26 can be appropriately adjusted according to the structure and characteristics of the optical system as a whole, which are related to the attenuation of vibrations along the optical axis. For example, the viscoelasticity of the viscoelastic adhesive portion 26 can be determined based on the size of the gap between the movable portion 12 and the flange portion 132, where the viscoelastic adhesive portion 26 should be located, the weight of the movable portion 12, the weight of the image shake correction device 20 and the lens unit, which are characteristics related to the vibration frequency of external impacts, or the focal range of the lens unit, which are characteristics related to the intensity of hand shakiness allowed.

[0116] More specifically, the viscoelasticity of the viscoelastic adhesive portion 26 can be adjusted such that it has no substantial effect on vibration frequencies below 10 Hz, while attenuating vibration frequencies above 100 Hz that would cause interference during imaging, in order to properly address image shake caused by hand tremors. Furthermore, the viscoelasticity of the viscoelastic adhesive portion 26 can also be appropriately adjusted according to the size of the viscoelastic adhesive portion. For example, when the viscoelastic adhesive portion 26 has the shape described above, the viscoelasticity of the viscoelastic adhesive portion 26 can be appropriately adjusted according to the size of the viscoelastic adhesive portion 26 with such a shape.

[0117] [Effects]

[0118] This embodiment has the same effect as Embodiment 1 described above in preventing the movable part 12 from detaching from the fixed part 11 with a simplified structure. That is, if an external impact caused by hand tremors or the like is applied to the image shake correction device 20, as described with respect to Embodiment 1, the movable part 12 moves relative to the fixed part 11 in the direction along the optical axis or in a direction intersecting the optical axis, but the detachment of the movable part 12 from the fixed part 11 in the direction along the optical axis is restricted by the anti-detachment part 13.

[0119] In this embodiment, a viscoelastic adhesive portion 26 is also provided between the anti-detachment portion 13 and the movable portion 12. Therefore, in this embodiment, the movement and detachment of the movable portion 12 caused by external impact are attenuated due to the viscoelasticity and adhesiveness of the viscoelastic adhesive portion 26.

[0120] Generally, in cameras, especially in interchangeable lens cameras of the single-lens type, shutter vibration becomes a disturbance, and image stabilization devices sometimes act unexpectedly. In conventional image stabilization devices, vibrations other than hand shake are also reacted to, sometimes affecting image capture. Therefore, an image stabilization device that can correct hand shake only is desired. In image stabilization devices suitable for such hand shake correction, a simplified structure including a gel sealed into the gap between the fixed part and the movable part is being explored. In such a simplified hand shake correction mechanism, a structure is known where a rod-shaped member extending from the movable part is inserted into a gel (gel pit) injected into a hole for sealing the fixed part with UV-curable gel, utilizing the viscous resistance generated between the gel and the rod-shaped member. However, this structure has the following problems.

[0121] • Gel pits need to be set up, so jitter correction devices become larger.

[0122] • Once the gel hardens, it becomes virtually impossible to decompose or clean it during repairs.

[0123] • A separate window for ultraviolet irradiation is required, which restricts the design of the image shake correction device.

[0124] In contrast, the image shake correction device 20 according to this embodiment has the anti-detachment portion 13 and the viscoelastic adhesive portion 26 as described above. The viscoelastic adhesive portion 26 is located between the movable portion 12 and the flange portion 132, embodying viscoelasticity and adhesion. Therefore, the movement of the movable portion 12 relative to the fixed portion 11 in the direction along the optical axis of the lens 14 and in the direction intersecting the optical axis of the lens 14 are both attenuated by the viscoelastic adhesive portion 26. Therefore, the following effects are achieved.

[0125] • By utilizing the gap between the movable part 12 and the flange part 132, there is no need to set up a dedicated gel pit.

[0126] • During assembly, gel is applied or applied only to the gap between the movable part 12 and the flange part 132, so that even once the gel has cured, it can be disassembled and cleaned during repair.

[0127] • No separate window is needed for irradiating the gel with ultraviolet light.

[0128] Based on the above description, it can be determined that in this embodiment, the image jitter correction device (20) also has a viscoelastic adhesive portion (26), which is located between the movable portion (12) and the flange portion (132) and has viscoelasticity. From the viewpoint of further attenuating the vibration of the image jitter correction device caused by external impact, this embodiment is more effective.

[0129] [Variation Example]

[0130] This invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included within the technical scope of this invention.

[0131] For example, in Embodiment 2, as long as the viscoelastic adhesive portion 26 has adequate viscoelasticity and adhesiveness, and can fully demonstrate its ability to restore the movable portion 12 to its expected position relative to the fixed portion 11, the viscoelastic adhesive portion 26 can also function to restore the position of the movable portion 12 relative to the optical axis in the image jitter correction device of the present invention. In the embodiments of the present invention, the movable portion 12 is restored to its position relative to the optical axis by the magnetic force of the magnet 122, but if the viscoelastic adhesive portion 26 has the above-mentioned restorative properties, the image jitter correction device in the embodiments of the present invention may not have a magnetic yoke 112. In this case, the viscoelastic adhesive portion 26 has strong restorative properties in the direction along the optical axis and weak restorative properties in the direction orthogonal to the optical axis, which is preferred from the viewpoint of suppressing the increase of useless load in the movement of the movable portion. In order to demonstrate such restorative properties, a viscoelastic adhesive portion having a large contact area in the direction along the optical axis is preferred, for example, a washer-shaped viscoelastic adhesive portion is preferred.

Claims

1. A jitter correction device, comprising: Fixing part; The movable part holds the lens and is capable of moving relative to the fixed part in a direction intersecting the optical axis of the lens; as well as The anti-detachment part is fixed to the fixing part in a state where it is inserted through the notch of the movable part, thus preventing the movable part from disengaging from the fixing part in the direction along the optical axis. Only a portion of the circumferential direction of the surface of the movable part opposite to the fixed part is opposite to the anti-detachment part. The anti-detachment part has: The shaft portion extends from the fixed portion toward the movable portion in a direction along the optical axis; as well as The flange portion extends from the front end of the shaft portion in a direction intersecting the optical axis. The shaft portion of the anti-detachment part is inserted into the notch portion of the movable part.

2. The image jitter correction device as described in claim 1, The flange portion has a notch in part of its outer periphery. The fixing part has a protrusion that is inserted into the notch.

3. The image jitter correction device as described in claim 1 or 2, further comprising: The viscoelastic adhesive portion, located between the movable portion and the flange portion, is viscoelastic.

4. The image jitter correction device as described in claim 1 or 2, further comprising: An electromagnetic actuator causes the movable part to move relative to the fixed part in a direction intersecting the optical axis of the lens.

5. A lens unit having an image shake correction device as described in any one of claims 1 to 4.

6. A camera device having an image shake correction device as described in any one of claims 1 to 4.

Images