Image stabilization mechanism and lens barrel including the same

Abstract

To provide an image stabilization mechanism that can be driven efficiently while suppressing the generation of moment, and a lens barrel including the image stabilization mechanism.SOLUTION: An image stabilization mechanism 20 comprises a lens frame 21, a fixed frame 22, coils 23a and 23b, three balls 24, and a pressing mechanism 25. The coils 23a and 23b are provided to the lens frame 21, and the flow of current generates the Lorentz force when the lens frame 21 is moved relative to the fixed frame 22. The three balls 24 support the lens frame 21 in a rollable state between the fixed frame 22 and the lens frame 21. The pressing mechanism 25 applies the force to press the lens frame 21 against the fixed frame 22, and includes magnets 25a and 25b on the fixed frame 22 side, and magnetic bodies 25e and 25f disposed near the center of gravity G of members on a movable side so as to be attracted by the magnets 25a and 25b and be opposite the magnets 25a and 25b in the lens frame 21.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present disclosure relates to an image stabilization mechanism mounted in a lens barrel and a lens barrel equipped with the same. [Background technology]

[0002] Patent Document 1 discloses a lens barrel having a movable member that holds a lens group that moves parallel to an optical system consisting of multiple lens groups, some of which are for image blur correction and move parallel to a plane perpendicular to the optical axis; a fixed member that restricts the movable member in the optical axis direction; at least three balls that are sandwiched between the movable member and the fixed member and are movable relative to each of the movable member and the fixed member within a limited range set on the movable member or the fixed member; a biasing means that biases the movable member toward the fixed member; two driving means that generate forces that move the movable member in two directions that are approximately perpendicular to each other; and two position detecting means that independently detect the position of the movable member in each of the two directions that are approximately perpendicular to each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-290184 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-described conventional lens barrel has the following problems. That is, in the lens barrel disclosed in the above publication, a moment is likely to occur in the image stabilization mechanism, and it is difficult to say that the lens barrel is driven efficiently. An object of the present disclosure is to provide an image stabilization mechanism that can be driven efficiently by suppressing the generation of moments, and a lens barrel equipped with the same. [Means for solving the problem]

[0005] The image stabilization mechanism according to the present disclosure includes a lens frame, a frame member, a coil, three or more spherical members, and a pressing mechanism. The lens frame holds an optical lens. The frame members are arranged adjacent to each other in the optical axis direction of the lens frame. The coil is provided in the lens frame, and a current flows through the coil when the lens frame is moved relative to the frame member, generating a Lorentz force. The three or more spherical members are provided between the frame member and the lens frame in a rollable state and support the lens frame. The pressing mechanism applies a force pressing the lens frame against the frame member, and includes a magnet provided in the frame member and a magnetic body that is attracted to the magnet and is positioned on the lens frame facing the magnet, near the center of gravity of the movable member including the lens frame. [Effects of the Invention]

[0006] According to the image stabilization mechanism according to the present disclosure, the generation of moments can be suppressed and the mechanism can be driven efficiently. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is an exploded perspective view showing the configuration of a lens barrel including an image stabilization mechanism according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing a configuration including an image stabilization mechanism included in the lens barrel of FIG. [Figure 3] Cross-sectional view of the image stabilization mechanism shown in Figure 2, taken along line XX. [Figure 4] FIG. 3 is a plan view of the image stabilization mechanism of FIG. 2 as seen from the subject side. [Figure 5] Figure 4 shows a cross section of the image stabilization mechanism taken along line ABCDEFGH. [Figure 6] FIG. 5 is a plan view showing the layout of the main components of the image stabilization mechanism shown in FIG. 4. [Figure 7] 7 is a graph showing thrust distribution in the linear (yaw) direction of the image stabilization mechanism of FIG. 6; [Figure 8] 7 is a graph showing thrust distribution in the rotation (pitch) direction of the image stabilization mechanism of FIG. 6. [Figure 9] 7 is a plan view showing a configuration in which the arrangement of the magnetic plate of the image stabilization mechanism of FIG. 6 is changed to a position shifted from the center of gravity of the movable member. [Figure 10] Cross-sectional view of Figure 9. [Figure 11] FIG. 10 is a plan view showing the arrangement of the main components of an image stabilization mechanism according to another embodiment of the present disclosure. [Figure 12] FIG. 10 is a plan view showing the arrangement of the main components of an image stabilization mechanism according to yet another embodiment of the present disclosure. [Figure 13] FIG. 10 is a plan view showing the arrangement of the main components of an image stabilization mechanism according to yet another embodiment of the present disclosure. [Figure 14] Cross-sectional view of Figure 13. [Figure 15] FIG. 10 is a plan view showing the arrangement of the main components of an image stabilization mechanism according to yet another embodiment of the present disclosure. [Figure 16] Cross-sectional view of Figure 15. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, more detailed description than necessary may be omitted. For example, detailed description of well-known matters or redundant description of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. The applicant provides the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and does not intend for them to limit the subject matter described in the claims.

[0009] (Embodiment 1) A lens barrel 10 equipped with an image stabilization mechanism 20 according to an embodiment of the present disclosure will be described below with reference to FIGS. 1 to 10. FIG. (1) Structure of the lens barrel 10 The lens barrel 10 according to this embodiment is detachably attached to a camera body (not shown), and as shown in FIG. 1, comprises a first group unit 11, an OIS (Optical Image Stabilizer) unit 12, a cam frame 13, a focus unit 14, and an exterior unit 15.

[0010] As shown in FIG. 1, the first group unit 11 is a substantially cylindrical member that is positioned closest to the subject in the direction of the optical axis AX among the components that make up the lens barrel 10, and holds the first group lens on its inner peripheral surface. The OIS (Optical Image Stabilizer) unit 12 includes a camera shake correction mechanism 20, which will be described later, and includes a lens frame 21, a fixing frame 22, and the like.

[0011] 1, the cam frame 13 is disposed on the outer peripheral surface side of the OIS unit 12, and has a substantially cylindrical main body 13a and a plurality of cam grooves 13b and 13c formed in the main body 13a. Cam pins (not shown) of the exterior unit 15 move in an engaged state with the cam grooves 13b and 13c. 1, focus unit 14 is disposed on the image plane side of OIS unit 12 in the direction of optical axis AX, and holds a focus lens on its inner peripheral surface. Focus unit 14 has therein a focus lens and a drive mechanism in the direction of optical axis AX, and moves the focus lens back and forth in the direction of optical axis AX.

[0012] As shown in FIG. 1, exterior unit 15 is a roughly cylindrical member that constitutes the exterior portion of lens barrel 10, and has an annular zoom ring 15a, focus ring 15b, etc. attached to its outer circumferential surface in a rotatable manner along the circumferential direction. (2) Configuration of the image stabilization mechanism 20 The image stabilization mechanism 20 according to this embodiment is a mechanism that employs a so-called moving coil system and controls the movement of the lens frame 21 in the direction opposite to the direction of detected camera shake. As shown in Figures 2 and 3, the image stabilization mechanism 20 includes the lens frame 21 that holds the optical lens L1, a fixed frame (frame member) 22, coils 23a and 23b (see Figure 6), three balls (spherical members) 24 (see Figure 6), a pressing mechanism 25, a rotating shaft 26, a thrust spring 27 (see Figure 4), a retainer 28 (see Figure 4), and position detection elements 29a and 29b (see Figure 5).

[0013] 2 and 3, the lens frame 21 is a generally plate-shaped member that holds the optical lens L1 at its center and is attached so as to be movable relative to the fixed frame 22. The lens frame 21 is supported at three points in the optical axis direction of the optical lens L1 by three balls 24. By passing a current through coils 23a and 23b (described later), the lens frame 21 is driven to move in the direction opposite to the direction of camera shake detected using a gyro sensor (not shown) or the like.

[0014] 4 and 5, the fixed frame (frame member) 22 is a substantially cylindrical member and is disposed adjacent to the lens frame 21 in the optical axis direction. Magnets 25a, 25b, 25c, 25d, etc., which will be described later, are disposed in the fixed frame 22. Coils 23a and 23b (see Figure 6) are provided on the lens frame 21, and when a current is passed through them to move the lens frame 21 relative to the fixed frame 22, the magnetic force of adjacently arranged magnets 25a and 25b generates a Lorentz force in the desired direction (the opposite direction to the camera shake direction).

[0015] 5, the coil 23a is provided on the lens frame 21, and is controlled to be energized when camera shake is detected, thereby moving the lens frame 21. When the coil 23a is energized to drive the lens frame 21 toward the linear movement side (yaw side), a Lorentz force is generated by the magnetic force of the magnet 25a disposed opposite the fixed frame 22 side. 5, the coil 23b is provided on the lens frame 21, and is controlled to be energized when camera shake is detected, thereby moving the lens frame 21. When the coil 23b is energized to drive the lens frame 21 toward the rotation side (pitch side), a Lorentz force is generated by the magnetic force of the magnet 25b arranged opposite the fixed frame 22 side.

[0016] Three balls (spherical members) 24 (see FIG. 6) are provided between the fixed frame 22 and the lens frame 21 in a rollable state, and support the lens frame 21 relative to the fixed frame 22. The pressing mechanism 25 applies a force to press the lens frame 21 against the fixed frame 22, and includes magnets 25a, 25b provided on the fixed frame 22, and magnetic plates 25e, 25f that are attracted to the magnets 25a, 25b and positioned opposite the magnets 25a, 25b on the lens frame 21, near the center of gravity G of the movable side members including the lens frame 21.

[0017] Here, the movable member refers to a configuration including an optical lens L1, a lens frame 21, and coils 23a and 23b, which is supported by a fixed frame 22 via a ball 24 and is driven by passing current through the coils 23a and 23b. The detailed configuration of the pressing mechanism 25 will be described later. 4 and 5, the rotation shaft 26 is a rod-shaped member arranged along the optical axis direction, with a first end fixed to the fixed frame 22 side and a second end on the lens frame 21 side fitted into the elongated hole 26b so as to be rotatable and linearly movable. The rotation shaft 26 serves as the center of rotation when the lens frame 21 is controlled to rotate in the pitch direction relative to the fixed frame 22. The long side surface of the elongated hole 26b serves as a sliding surface when the lens frame 21 is controlled to linearly move in the yaw direction.

[0018] 4, the thrust spring 27 is provided at the end of the lens frame 21 on the side where the pressing mechanism 25 is not provided. The thrust spring 27 applies a force that pulls the lens frame 21 toward the fixed frame 22 in the optical axis direction to prevent the end of the lens frame 21 from floating up and causing continuous large vibrations in the event of improper handling such as being dropped or subjected to impact. 4, the retainer 28 is provided on the upper surface of the lens frame 21, passes through the lens frame 21, and is fixed to the fixed frame 22. The retainer 28 is attached so that the lens frame 21 does not move away from the fixed frame 22 in the optical axis direction by more than a predetermined distance.

[0019] As shown in FIG. 5, the position detection elements 29a and 29b are arranged on the lens frame 21 to detect the relative position of the lens frame 21 with respect to the fixed frame 22 when the lens frame 21 is driven by the image stabilization mechanism 20. As shown in FIG. 5, the position detection element 29a is disposed in a position facing the magnet 25c for position detection on the linear movement side (yaw side), and detects the relative position of the lens frame 21 with respect to the fixed frame 22 on the linear movement side (yaw side).

[0020] As shown in FIG. 5, the position detection element 29b is disposed in a position facing the magnet 25d for position detection on the rotation side (pitch side), and detects the relative position of the lens frame 21 with respect to the fixed frame 22 on the rotation side (pitch side). (3) Configuration of the pressing mechanism 25 As described above, the pressing mechanism 25 provided in the image stabilization mechanism 20 of this embodiment applies a force that presses the lens frame 21 in the optical axis direction against the fixed frame 22. As shown in Fig. 6, the image stabilization mechanism 20 is provided with a total of two pairs: one pair of magnet 25a and magnetic plate 25e, and another pair of magnet 25b and magnetic plate 25f.

[0021] That is, the pressing mechanism 25 can press the lens frame 21 against the fixed frame 22 in the optical axis direction by using a first attractive force generated between the magnet 25a and the magnetic plate 25e and a second attractive force generated between the magnet 25b and the magnetic plate 25f. The magnet 25a is provided at a position facing the coil 23a on the lens frame 21 side of the fixed frame 22 in order to drive the lens frame 21 on the linear movement side (yaw side). The magnet 25a also generates an attractive force between itself and the magnetic plate 25e, thereby applying a force that presses the lens frame 21 against the fixed frame 22.

[0022] The magnetic plate 25e is disposed in a position facing the magnet 25a on the linear motion side (yaw side) in the optical axis direction, and is subjected to an attractive force that attracts it to the magnet 25a. The magnetic plate 25e is disposed at a position where the center of gravity G of the lens frame 21 (the movable member) is projected onto each drive shaft of the lens frame 21, as shown in Fig. 6. That is, as shown in FIG. 6, the magnetic plate 25e is disposed at a position on the magnet 25a that is the shortest distance from the center of gravity G of the movable members including the lens frame 21 in a plan view.

[0023] The magnet 25b is provided at a position facing the coil 23b on the lens frame 21 side of the fixed frame 22 in order to rotate the lens frame 21 around the rotation axis 26. The magnet 25b also applies a force that presses the lens frame 21 against the fixed frame 22 by generating an attractive force between itself and the magnetic plate 25f. Magnetic plate 25f is disposed in a position facing magnet 25b on the rotation side (pitch side) in the optical axis direction, and is subjected to an attractive force that attracts it to magnet 25b. Like magnetic plate 25e, magnetic plate 25f is disposed at a position where the center of gravity G of lens frame 21 (movable side member) is projected onto each drive shaft of lens frame 21, as shown in Fig. 6.

[0024] That is, as shown in FIG. 6, the magnetic plate 25f is disposed at a position on the magnet 25b that is the shortest distance from the center of gravity G of the movable members including the lens frame 21 in a plan view. As a result, in the moving coil type image stabilization mechanism 20 in which the coils 23a, 23b are attached to the movable side (lens frame 21), the magnetic plates 25e, 25f are arranged at positions spaced a predetermined distance from the magnets 25a, 25b fixed to the fixed side (fixed frame 22), and thus the magnetic attraction force generated between the magnetic plates 25e, 25f and the magnets 25a, 25b can bias them in the thrust direction (optical axis direction).

[0025] Therefore, there is no need to place the conventional tension coil spring for biasing on the outer periphery of image stabilization mechanism 20, allowing lens barrel 10 to have a smaller diameter than before. Also, there is no variation in thrust force caused by variations in tension coil spring parts, variations in assembly, etc. Furthermore, by arranging the magnetic plates 25e and 25f at positions facing the drive coils 23a and 23b with respect to the magnets 25a and 25b for driving the lens frame 21, it is possible to improve the thrust.

[0026] Furthermore, compared to a moving magnet system in which a magnet is arranged on the movable side, the movable side (lens frame 21, etc.) is lighter, which can improve the actuator (G resistance) performance. Furthermore, in the image stabilization mechanism 20 of this embodiment, magnetic plates 25e and 25f are arranged at positions facing each other in the optical axis direction on the existing drive magnets 25a and 25b for moving the lens frame 21 relative to the fixed frame 22.

[0027] This eliminates the need to provide a separate magnet to press the lens frame 21 against the fixed frame 22 in the optical axis direction, thereby avoiding an increase in the number of parts and weight. Furthermore, since the magnetic plates 25e and 25f are positioned opposite the drive magnets 25a and 25b in the linear (yaw) direction and rotational (pitch) direction, respectively, the magnetic flux density interlinked with the drive coils 23a and 23b increases, thereby improving the thrust.

[0028] Specifically, as shown in FIG. 7, the thrust distribution in the linear (yaw) direction is approximately 5.00×10 -3 (N) thrust is generated, whereas in the configuration in which the magnetic plate 25e is disposed, the thrust is approximately 8.00 to 11.00 × 10 -3 A thrust of (N) was generated. In particular, the maximum thrust was obtained at the position where magnetic plate 25e was placed, as indicated by the broken line in FIG.

[0029] Similarly, the thrust distribution in the rotation (pitch) direction is approximately 5.00×10 as shown in Figure 8. -3 (N) thrust is generated, whereas in the configuration where the magnetic plate 25f is arranged, it is approximately 8.50 to 11.00 × 10 -3 A thrust of (N) was generated. In particular, the maximum thrust was obtained at the position where magnetic plate 25f was placed, as indicated by the broken line in FIG. As a result, in an actuator in which magnets 25a, 25b and coils 23a, 23b are arranged at a predetermined distance and current is passed through coils 23a, 23b to drive lens frame 21, by arranging magnetic plates 25e, 25f for biasing lens frame 21 in the optical axis (thrust) direction near magnets 25a, 25b, the thrust near the positions where magnetic plates 25e, 25f are arranged increases. Therefore, by arranging magnetic plates 25e, 25f of each actuator at the center of gravity G of lens frame 21, etc. on the movable side, the portion of the center of gravity G of the movable side member can be driven, allowing for efficient driving without generating a moment.

[0030] In the image stabilization mechanism 20 of this embodiment, in particular, the magnetic plates 25e and 25f are arranged at positions where the center of gravity G of the movable members including the lens frame 21 is projected in the linear (yaw) direction and the rotational (pitch) direction. This makes it possible to suppress the generation of moment and enable efficient driving. <Major features> As shown in Fig. 6, the image stabilization mechanism 20 of this embodiment includes a lens frame 21, a fixed frame 22, coils 23a and 23b, three balls 24, and a pressing mechanism 25. The lens frame 21 holds the optical lens L1. The fixed frame 22 is disposed adjacent to the lens frame 21 in the optical axis direction. The coils 23a and 23b are provided on the lens frame 21, and when the lens frame 21 is moved relative to the fixed frame 22, a current flows through the coils 23a and 23b, generating a Lorentz force. The three balls 24 are provided between the fixed frame 22 and the lens frame 21 in a rotatable state and support the lens frame 21. The pressing mechanism 25 applies a force to press the lens frame 21 against the fixed frame 22, and includes magnets 25a, 25b provided on the fixed frame 22, and magnetic plates 25e, 25f that are attracted to the magnets 25a, 25b and positioned opposite the magnets 25a, 25b on the lens frame 21, near the center of gravity G of the movable side members including the lens frame 21.

[0031] As a result, in the moving coil type image stabilization mechanism 20 in which the coils 23a, 23b are attached to the lens frame 21, the magnetic plates 25e, 25f are positioned opposite the magnets 25a, 25b fixed to the fixed frame 22, and therefore can be biased in the thrust direction (optical axis direction) by the magnetic attraction force generated between the magnetic plates 25e, 25f and the magnets 25a, 25b.

[0032] Furthermore, since the magnetic plates 25e and 25f are positioned opposite the magnets 25a and 25b and near the center of gravity G of the movable side members including the lens frame 21, a force can be applied near the center of gravity of the movable side members including the lens frame 21. As a result, in the image stabilization mechanism 20 that employs the so-called moving coil system, the generation of a moment can be suppressed and the mechanism can be driven efficiently.

[0033] [Other embodiments] Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above embodiment, and various modifications are possible without departing from the gist of the disclosure. (A) In the above embodiment, an example has been described in which magnetic plates 25e and 25f of pressing mechanism 25 included in image stabilization mechanism 20 of the present disclosure are disposed at positions projected onto the respective drive shafts from center of gravity G of the movable member (positions on magnets 25a and 25b at the shortest distance). However, the present disclosure is not limited to this.

[0034] For example, as shown in Figures 9 and 10, only one of the magnetic plates 25e may be positioned at a position projected from the center of gravity G of the movable member onto each drive shaft (the position with the shortest distance on magnet 25a), and the other magnetic plate 25f may be positioned at a position offset from the position projected from the center of gravity G of the movable member onto each drive shaft (the position with the shortest distance on magnet 25b).

[0035] (B) In the above embodiment, an example has been described in which the center of gravity G of the movable members including the lens frame 21 is located at a position shifted downward in the drawing from the optical axis center of the optical lens L1, and the magnetic plates 25e, 25f are located at positions where this center of gravity G is projected onto the respective drive shafts of the linear motion side and the rotational side. However, the present disclosure is not limited to this.

[0036] For example, as shown in FIG. 11, the center of gravity G of the movable member including the lens frame 21 is located at a position shifted leftward and downward from the position of the optical axis center of the optical lens L1, and the pressing mechanism 125 may have magnetic plates 25e and 125f respectively located at positions where this center of gravity G is projected onto the drive axes of the linear motion side and the rotational side. In this case, in order to suppress disturbances around the optical axis, the magnetic plates 25e and 25f are positioned so that the position where the maximum thrust is generated is aligned with the position of the center of gravity G, thereby effectively suppressing the generation of moment force around the optical axis of the lens frame 21.

[0037] Furthermore, as shown in FIG. 11, by disposing the magnetic plate 25f shifted toward the center of gravity G from the magnetic polarization lines, a force that urges the lens frame 21 toward the center of gravity G can be generated. Furthermore, in this embodiment, the position of the magnetic plate 125f is shifted toward the center of gravity so that it overlaps the line connecting two of the three balls 24 that surround both sides of the magnetic plate 125f. Therefore, the moment around the axis connecting the two balls that surround both sides of the magnetic plate 125f, which is generated by the attractive force (pressing force) in the optical axis direction, becomes very small, and one mode of fluttering vibration in the optical axis direction can be suppressed.

[0038] (C) In the above embodiment, an example has been described in which three balls 24 are arranged to form a substantially equilateral triangle in a plan view, and magnetic plates 25f are arranged only on the base side of the triangle in the drawing, as shown in Fig. 6 etc. However, the present disclosure is not limited to this. For example, as shown in FIG. 12, three balls (spherical members) 124 may be arranged to surround the center of gravity G of the movable member including the lens frame 21, and two magnetic plates 25e, 125f may be arranged on the sides of a triangle (polygon) connecting the three balls 124.

[0039] In this case, as shown in Figure 12, the generation of moment forces around the two axes connecting two of the three balls 124 located on both sides of the magnetic plates 25e, 25f, which are generated by the magnetic force (pressing force), can be reduced, thereby suppressing fluttering vibrations in the optical axis direction. (D) 5 and 6, the above embodiment has been described with reference to an example in which magnetic plates 25e and 25f constituting the pressing mechanism 25 are arranged at positions on the lens frame 21 side facing magnets 25a and 25b arranged on the fixed frame 22 side to drive the lens frame 21. However, the present disclosure is not limited to this.

[0040] For example, as shown in Figures 13 and 14, the pressing mechanism 225 may be configured by arranging magnetic plates 225e and 225f at positions on the lens frame 21 side opposite magnets 25c and 25d arranged on the fixed frame 22 side to detect the position of the lens frame 21. Even in this case, a force can be applied between the position detection magnets 25c, 25d and the magnetic plates 225e, 225f arranged opposite them to press the lens frame 21 toward the fixed frame 22 in the optical axis direction, similar to the case of the drive magnets 25a, 25b and the magnetic plates 25e, 25f arranged opposite them.

[0041] (E) 5 and 6, the above embodiment has been described with reference to an example in which the magnetic plates 25e and 25f constituting the pressing mechanism 25 are arranged only on the lens frame 21 side facing the magnets 25a and 25b arranged on the fixed frame 22 side to drive the lens frame 21. However, the present disclosure is not limited to this.

[0042] For example, as shown in Figures 15 and 16, the pressing mechanism 325 may have magnetic plates 325e, 325fa, and 325fb arranged at positions facing the magnets 25a and 25b on the driving side, as well as at positions facing the magnet 25d for position detection on the rotating side. Instead of or in addition to magnet 25d for detecting the position of the rotation side, a magnetic plate may be disposed at a position facing magnet 25c for detecting the position of the linear motion side to form a pressing mechanism.

[0043] (F) In the above embodiment, an example was described in which three balls 24 were used as spherical members that support the lens frame 21 relative to the fixed frame 22. However, the present invention is not limited to this. For example, the number of spherical members is not limited to three, but may be four or more.

[0044] (G) In the above embodiment, an example was described in which the plate-shaped magnetic plates 25e and 25f were used as the magnetic bodies that make up the pressing mechanism 25. However, the present invention is not limited to this. For example, the magnetic body does not have to be plate-shaped, and may have other shapes. (H) In the above embodiment, an example was given in which the configuration of the present disclosure was applied to the lens barrel 10 that is detachably attached to the camera body, but the present invention is not limited to this.

[0045] For example, the configuration of the present disclosure may be applied to a lens barrel that is fixed in an undetachable state to a camera body. <Additional Notes> The above description of the embodiments discloses the following techniques. (Technology 1) The image stabilization mechanism according to Technology 1 comprises: a lens frame for holding an optical lens; a frame member disposed adjacent to the lens frame in the optical axis direction; a coil provided in the lens frame, through which a current flows to generate a Lorentz force when the lens frame is moved relative to the frame member; three or more spherical members that are provided between the frame member and the lens frame in a rollable state and support the lens frame; a pressing mechanism that applies a force pressing the lens frame against the frame member, and that includes a magnet provided on the frame member, and a magnetic body that is attracted to the magnet and is located in a position on the lens frame facing the magnet and near the center of gravity of a movable member that includes the lens frame; It is equipped with:

[0046] (Technology 2) The image stabilization mechanism according to the second technology is the image stabilization mechanism according to the first technology, The magnetic bodies are disposed at positions where the center of gravity of the lens frame is projected onto each drive shaft of the lens frame. (Technology 3) The image stabilization mechanism according to the third technology is the image stabilization mechanism according to the first or second technology, The three or more spherical members are arranged to surround the center of gravity of the lens frame, and at least one of the multiple magnetic bodies is arranged on a side of a polygon connecting the three or more spherical members or inside the polygon.

[0047] (Technology 4) The image stabilization mechanism according to the fourth technology is the image stabilization mechanism according to any one of the first to third technologies, The magnet is provided near the coil to drive the lens frame.

[0048] (Technology 5) The image stabilization mechanism according to Technology 5 is the image stabilization mechanism according to Technology 4, The magnetic bodies are disposed at positions facing the magnets provided for driving the lens frame in the yaw direction and the pitch direction, respectively. (Technology 6) The image stabilization mechanism according to the sixth aspect of the present invention is an image stabilization mechanism according to any one of the first to fifth aspects of the present invention, The magnet is provided to detect the position of the lens frame relative to the frame member.

[0049] (Technology 7) The lens barrel according to Technology 7 is An image stabilization mechanism according to any one of techniques 1 to 6; an optical system including a plurality of optical lenses; It is equipped with: [Industrial Applicability]

[0050] The image stabilization mechanism of the present disclosure has the effect of suppressing the generation of moments and enabling efficient driving, and is therefore widely applicable to various lens barrels equipped with image stabilization mechanisms. [Explanation of symbols]

[0051] 10 Lens barrel 11 1st group unit 12 OIS units 13 Cam frame 13a Main body 13b, 13c Cam groove 14 Focus Unit 15 Exterior unit 15a Zoom ring 15b Focus ring 20 Image stabilization mechanism 21 Lens frame 22 Fixed frame (frame member) 23a coil 23b coil 24 Ball (spherical member) 25 Pressing mechanism 25a Magnet 25b Magnet 25c magnet 25d magnet 25e Magnetic plate (magnetic material) 25f Magnetic plate (magnetic material) 26 Rotating shaft 27 Thrust spring 28 Stopper 29a, 29b Position detection element 124 Ball (spherical member) 125 Pressing mechanism 125f Magnetic plate (magnetic material) 225 Pressing mechanism 225e Magnetic plate (magnetic material) 225f Magnetic plate (magnetic material) 325 Pressing mechanism 325e Magnetic plate (magnetic material) 325fa magnetic plate (magnetic material) 325fb Magnetic plate (magnetic material) L1 Optical Lens

Claims

1. a lens frame for holding an optical lens; a frame member disposed adjacent to the lens frame in the optical axis direction; a coil provided in the lens frame, through which a current flows to generate a Lorentz force when the lens frame is moved relative to the frame member; three or more spherical members that are provided between the frame member and the lens frame in a rollable state and support the lens frame; a pressing mechanism that applies a force pressing the lens frame against the frame member, and that includes a magnet provided on the frame member, and a magnetic body that is attracted to the magnet and is located in a position on the lens frame facing the magnet and near the center of gravity of a movable member that includes the lens frame; Equipped with an image stabilization mechanism.

2. the magnetic body is disposed at a position where the center of gravity of the lens frame is projected onto each drive shaft of the lens frame; The image stabilization mechanism according to claim 1 .

3. The magnetic body is arranged so that the center of gravity is closer to the center of gravity of the movable member than the polarization line of the magnet.

3. The image stabilization mechanism according to claim 1.

4. the three or more spherical members are arranged so as to surround the center of gravity of the lens frame, At least one of the plurality of magnetic bodies is disposed on a side of a polygon connecting the three or more spherical members or inside the polygon.

3. The image stabilization mechanism according to claim 1.

5. the magnet is provided in the vicinity of the coil to drive the lens frame; 3. The image stabilization mechanism according to claim 1.

6. the magnetic bodies are disposed at positions facing the magnets provided for driving the lens frame in the yaw direction and the pitch direction, respectively; The image stabilization mechanism according to claim 5 .

7. the magnet is provided to detect the position of the lens frame relative to the frame member.

3. The image stabilization mechanism according to claim 1.

8. The image stabilization mechanism according to claim 1 or 2; an optical system including a plurality of optical lenses; A lens barrel comprising:

Images