Image stabilization device, optical device, and imaging device

Abstract

The present invention provides a runout correction device that does not use viscoelastic materials, is easy to assemble, and can more easily suppress overcorrection by the runout correction device. [Solution] A shake correction device comprising: a movable unit that holds a lens and is movable in a direction perpendicular to the optical axis of the lens; a fixed unit that holds the movable unit; rolling balls positioned between the movable unit and the fixed unit in a direction along the optical axis and rolling when the movable unit moves relative to the fixed unit; and one or more pairs of permanent magnets held by the movable unit and the fixed unit, wherein the pair of permanent magnets generate a repulsive force between the movable unit and the fixed unit in a direction along the optical axis and in a direction perpendicular to the optical axis.

Description

Technical Field

[0005] , ,

[0001] The present invention relates to a shake correction device, an optical device, and an imaging device.

Background Art

[0002] Conventionally, in optical devices such as digital cameras, video cameras, and interchangeable lenses, an anti-shake mechanism that can reduce image blur caused by camera shake during shooting by translating a shake correction lens in a direction orthogonal to the optical axis of the optical system constituting the lens has been available. Such an anti-shake mechanism detects camera vibration and moves the shake correction lens to a target position orthogonal to the optical axis based on the detected values of the shake signals in the pitch and yaw directions when image blur occurs. This movement cancels out the image blur, making it possible to reduce the image blur. Detection of vibration (camera shake) can be performed by mounting shake detection means in the camera, which consists of a sensor that detects acceleration, velocity, etc., and a shake signal output circuit that electrically or mechanically integrates the output signal of this sensor to output displacement.

[0003] In order to suppress overcorrection of the shake correction device, a configuration is known in which an elastic member such as gel or rubber is used to exert a damping effect and derive a stopping action. In Patent Document 1, a configuration is disclosed in which a viscoelastic member such as rubber that exerts a braking action in a direction orthogonal to the optical axis is provided as a mechanism for preventing overcorrection of the shake correction optical system.

Prior Art Documents

Patent Documents

[0004] <00​​​​​​​​​​​​​However, the viscoelastic member disclosed in Patent Document 1 mentioned above is intended to be opened and coated from a new state, but its properties may change if stored for too long after opening. In this case, the coating work must be done within a limited period, and any viscoelastic member that cannot be used during that time must be discarded, resulting in waste. Furthermore, when applying the viscoelastic member to the desired position on the member, care must be taken to prevent it from adhering to the surrounding area, and it may be necessary to cure it with UV irradiation after application to recessed areas of the mechanism, making the assembly process complicated. This also increases the time required and thus the assembly cost. To solve these problems, there is a need for a method to suppress overcorrection without using viscoelastic members.

[0006] Therefore, the present invention aims to provide a runout correction device that does not use viscoelastic members, is easy to assemble, and can more easily suppress overcorrection by the runout correction device. [Means for solving the problem]

[0007] To achieve the above objective, a shake correction device as one aspect of the present invention comprises: a movable unit that holds a lens and is movable in a direction perpendicular to the optical axis of the lens; a fixed unit that holds the movable unit; rolling balls arranged between the movable unit and the fixed unit in a direction along the optical axis and rolling when the movable unit moves relative to the fixed unit; and one or more pairs of permanent magnets held by the movable unit and the fixed unit, wherein the pair of permanent magnets generates a repulsive force between the movable unit and the fixed unit in a direction along the optical axis and in a direction perpendicular to the optical axis. [Effects of the Invention]

[0008] According to the present invention, it is possible to suppress overcorrection of the runout compensation device more easily without using viscoelastic members and with easy assembly. [Brief explanation of the drawing]

[0009] [Figure 1] This is an exploded perspective view of the vibration compensation device according to Embodiment 1. [Figure 2] This is an exploded perspective view of the fixed unit according to Embodiment 1. [Figure 3] This is a front view of the fixed unit according to Embodiment 1. [Figure 4] This is an exploded perspective view of the movable unit according to Embodiment 1. [Figure 5] This is a cross-sectional view of an overcorrection suppression mechanism in which the permanent magnet according to Embodiment 1 is cylindrical in shape. [Figure 6] This figure shows the relationship between the shift position and the repulsive force in the shift direction when the movable unit according to Embodiment 1 is driven to shift. [Figure 7] This figure shows the relationship between the shift position and the repulsive force in the optical axis direction when the movable unit according to Embodiment 1 is driven to shift. [Figure 8] This is a cross-sectional view of the overcorrection suppression mechanism in which the permanent magnet according to Embodiment 2 has a frustoconical shape. [Modes for carrying out the invention]

[0010] The embodiments will be described in detail below with reference to the attached drawings. Note that the following embodiments do not limit the invention as defined in the claims. While the embodiments describe multiple features, not all of these features are essential to the invention, and the features may be combined in any way. Furthermore, in the attached drawings, identical or similar configurations are given the same reference numerals, and redundant descriptions are omitted.

[0011] <Embodiment 1> The runout correction device 1 in this embodiment will be described below with reference to Figures 1 to 7. Figure 1 is an exploded perspective view of the runout correction device 1 of Embodiment 1.

[0012] The camera (imaging device) in this embodiment is configured to include an optical device (lens barrel) and a camera body (not shown). The lens barrel is configured to include, for example, a lens, a cam ring, a guide tube, a zoom ring, an electromagnetic diaphragm unit, and various lens barrel groups. The lens barrel also has a mount. The mount is a component fixed to the camera body (not shown), where an image sensor that captures an image of a subject through the optical element (lens) is located. That is, the mount in the optical device is configured to be attachable to the mount of the camera body, and by attaching it to the mount of the camera body, it can be connected to the camera body in a communicative manner. Furthermore, the imaging device is configured to capture an image formed through the optical device. Note that the imaging device may be an imaging device in which the optical device and the camera body are integrated.

[0013] Furthermore, the camera of this embodiment is configured to include a shake sensor, a control unit (microcomputer), and a shake correction device 1. The shake sensor (not shown) detects camera shake such as hand shake. The shake sensor is configured, for example, by a gyro sensor. The control unit (not shown) is at least one computer including a CPU and memory, and controls a shift actuator to shift the image stabilization lens L1 in a direction that cancels image shake caused by camera shake, based on the shake signal from the shake sensor. The shake correction device 1 is configured to include a fixed unit 2 and a movable unit 3 that shifts relative to the fixed unit 2. In other words, the movable unit 3 is configured to be movable in a direction perpendicular to the optical axis of the lens (optical axis orthogonal direction). The movable unit 3 is also held by the fixed unit 2.

[0014] The configuration of the fixed unit 2 in this embodiment will be described below with reference to Figures 2 and 3. Figure 2 is an exploded perspective view of the fixed unit 2 in this embodiment. Figure 3 is a front view of the fixed unit 2 in this embodiment (viewed from the image side 5 to the image sensor side 6). In this embodiment, the front (one side) of the shake correction device 1 is the image side (subject side) 5, and the back (the other side) is the image sensor side 6.

[0015] The shift base 21 holds the other components of the fixed unit 2 and the movable unit 3. On the back side (image sensor side 6) of the shift base 21, a pair of magnets 201 that form part of a yaw shift actuator for shifting the movable unit 3 in the horizontal (yaw) direction, which is one of the directions orthogonal to the optical axis OA direction, are fixed. Also, on the back of the shift base 21, a pair of magnets 202 that form part of a pitch actuator for shifting the movable unit 3 in the vertical (pitch) direction, which is the other one of the directions orthogonal to the optical axis direction, are fixed. The pair of magnets 201 are arranged such that the S pole and the N pole are reversed in the optical axis OA direction with respect to each other. The same applies to the pair of magnets 202.

[0016] On the front side (image side 5) of the shift base 21, a yoke 203, which is an iron member that closes the magnetic path of the magnetic flux generated from the magnet 201, and a yoke 204, which is an iron member that closes the magnetic path of the magnetic flux generated from the magnet 202, are fixed.

[0017] In the central portion of the shift base 21, a substantially octagonal opening 211 penetrating in the optical axis OA direction is formed. The movable unit 3 is mechanically restricted in its shiftable range inside the opening 211. The centers of the upper, lower, left, and right sides of the opening 211 are used as mechanical ends when determining the shift center of the movable unit 3.

[0018] Also, on the back of the shift base 21, three ball retaining recesses 212 for rotatably holding each of the three balls (rolling balls) 41 are formed. The three balls 41 roll while being sandwiched between the front end face (bottom face) of the ball retaining recess 212 and the shift lens barrel 31 formed in the movable unit 3, thereby shifting and driving the movable unit 3 with respect to the fixed unit 2 in the yaw direction and the pitch direction. In other words, the balls 41 are arranged between the movable unit 3 and the fixed unit 2 in the direction along the optical axis OA, and function as rolling balls that roll when the movable unit 3 moves in a direction orthogonal to the optical axis with respect to the fixed unit 2.

[0019] Two first permanent magnets 51 are arranged on the shift base 21. The first permanent magnets 51 are arranged to prevent the occurrence of overcorrection of image shake. The first permanent magnets 51 are attached to magnet holding recesses 213 formed in the shift base 21. The magnet holding recesses 213 are formed at two locations in the shift base 21, and each of the first permanent magnets 51 is attached to each of the magnet holding recesses 213. Further, through holes 511 are provided at the central portions of each of the first permanent magnets 51. Incidentally, the through holes 511 may be formed in a concave shape without penetrating. In the case of a concave shape, the direction of the portion that becomes the bottom in the concave shape is set as the direction of the imaging element side 6.

[0020] Hereinafter, the configuration of the movable unit 3 in the present embodiment will be described with reference to FIG. 4. FIG. 4 is an exploded perspective view of the movable unit 3 of the present embodiment.

[0021] In the movable unit 3, the shift lens barrel 31 that functions as a shift member is a resin mold member that holds other components of the movable unit 3. On the front surface of the shift lens barrel 31, a coil 301 that constitutes a part of the above-described yaw shift actuator and a coil 302 that constitutes a part of the pitch shift actuator are fixed. The coil 301, the coil 302, and two magnetic sensors (Hall elements) 304 are connected to a microcomputer (control unit) via a shift flexible printed circuit board (hereinafter referred to as a shift FPC) 303. The shift FPC 303 is fixed to the back surface of the shift lens barrel 31, and a part thereof is guided by a guide portion 313 provided in the shift lens barrel 31.

[0022] On the front surface of the shift lens barrel 31, three ball receiving surfaces 314 for rotatably receiving three balls 41 are formed. Further, on the front surface of the shift lens barrel 31, three coil adhesion portions 311 for fixing the coil 301 by adhesion and three coil adhesion portions 312 for fixing the coil 302 by adhesion are formed.

[0023] Furthermore, a lens holding portion 316 for fixing the vibration-damping lens L1 to the shifting lens barrel 31 is formed in the center of the shifting lens barrel 31. Around the lens holding portion 316, a contact portion 317 is formed that abuts against the inner surface of the opening 211 of the shifting base 21 to mechanically limit the shiftable range of the movable unit 3.

[0024] Two magnetic sensors 304 are positioned inside coils 301 and 302. These magnetic sensors 304 output yaw position signals and pitch position signals corresponding to the changes in the magnetic field caused by the movement of opposing magnets 201 and 202 as the movable unit 3 shifts in the yaw and pitch directions, respectively. The microcomputer obtains the yaw and pitch positions of the movable unit 3 from these yaw and pitch position signals and provides feedback control to the energization of coils 301 and 302 so that the movable unit 3 shifts to the target position.

[0025] Furthermore, two second permanent magnets 52 are arranged in the shifting lens barrel 31. The second permanent magnets 52 are arranged to suppress overcorrection of image vibration, similar to the first permanent magnet 51. The second permanent magnets 52 are attached to magnet mounting portions (protrusions) 315 formed in the shifting lens barrel 31. Two magnet mounting portions 315 are formed in the shifting lens barrel 31, and each second permanent magnet 52 is attached to its respective magnet holding recess 213. The magnet mounting portions 315 are formed in the shifting lens barrel 31 of the movable unit 3 so as to extend (protrude) in the direction of the image side 5 in the optical axis direction OA.

[0026] The movable unit 3 configured in this way is assembled to the fixed unit 2. First, three balls 41 are placed between the ball receiving surface 314 of the movable unit 3 and the ball holding recess 212 of the fixed unit 2. Then, two second permanent magnets 52 are attached to the magnet mounting portion 315 configured on the shift lens barrel 31 to suppress overcorrection of image shake.

[0027] A metal retaining plate 61 is fixed to the shift base 21 of the fixed unit 2 by two screws 71 to hold down the movable unit 3 together with the shift FPC 303. In addition, a part of the shift FPC 303 is fixed to the retaining plate 61 by screws 72. The retaining plate 61 serves to prevent the movable unit 3 from moving toward the image sensor side 6 relative to the fixed unit 2 when a large impact is applied to the camera in the direction of the optical axis OA.

[0028] Figure 5 is a cross-sectional view of the shake correction device 1 of this embodiment, taken through the optical axis OA. Here, we will describe the structure when the permanent magnet (second permanent magnet 52) ​​for suppressing overcorrection of image shake is cylindrical. As mentioned above, the shift base 21 has magnet holding recesses 213 formed therein for attaching two first permanent magnets 51 to suppress overcorrection of image shake. In this embodiment, each of the first permanent magnets 51 is formed in a cylindrical shape and fixed to the magnet holding recesses 213 of the shift base 21 by press-fitting or adhesive application.

[0029] Furthermore, a through-hole 511 is provided in the center of the first permanent magnet 51. The through-hole 511 may have a difference in diameter between the inner diameter of the image side 5 and the inner diameter of the image sensor side 6. In this case, the through-hole 511 will have an inclined surface in the direction of the optical axis OA, which is formed by connecting the inner diameter of the image side 5 and the inner diameter of the image sensor side 6. The first permanent magnet 51 is preferably cylindrical, but is not limited to a cylindrical shape; for example, it may be a rectangular parallelepiped or a polygon.

[0030] The shifting lens barrel 31 has a magnet mounting section 315 extending in the direction of the optical axis OA for attaching two second permanent magnets 52 to suppress overcorrection of image shake. The second permanent magnets 52 are fixed to this magnet mounting section 315 by adhesive application or screws. The second permanent magnets 52 are formed in a cylindrical shape. A recess is provided in the center of the second permanent magnet 5 for the magnet mounting section 315 to be attached. The second permanent magnet 52 is positioned in the magnet mounting section 315 by inserting the recessed portion into the magnet mounting section 315. Then, with the recessed portion attached to the magnet mounting section 315, it is fixed by adhesive application or screws.

[0031] As shown in Figure 5, the second permanent magnet 52 is configured to be inserted into the through hole 511 in a direction along the optical axis OA by being attached to the magnet mounting portion 315. In other words, the second permanent magnet 52 is inserted into the through hole 511 of the first permanent magnet 51 while attached to the magnet mounting portion 315, so that it is inserted relative to the first permanent magnet 51 in a direction along the optical axis OA. As shown in Figure 5, at least a portion of the second permanent magnet 52 is inserted into the through hole 511 in a direction along the optical axis OA. However, it is not limited to this, and the second permanent magnet 52 may be configured to be inserted entirely into the through hole 511 in a direction along the optical axis OA. Details of the amount of insertion of the second permanent magnet 52 relative to the first permanent magnet 51 in the direction along the optical axis OA will be described later.

[0032] In this embodiment, a pair of permanent magnets is formed by one first permanent magnet 51 and one second permanent magnet 52. One or more pairs of permanent magnets are arranged in the shake correction device 1 by being held in the movable unit 3 and the fixed unit 2, respectively. The magnetization direction is configured such that the inner wall side of the first permanent magnet 51 and the second permanent magnet 52 are in a repulsive relationship with each other. Here, as shown in Figure 5, when the inner wall side of the first permanent magnet 51 is the south pole, the image sensor side 6 of the second permanent magnet 52 is positioned as the south pole. On the other hand, conversely to the case in Figure 5, when the inner wall side of the first permanent magnet 51 is the north pole, the image sensor side 6 of the second permanent magnet 52 may be positioned as the north pole.

[0033] In this embodiment, since two first permanent magnets 51 and two second permanent magnets 52 are arranged in the vibration correction device 1, two pairs of permanent magnets are arranged in the vibration correction device 1. Furthermore, as shown in Figure 3 in this embodiment, the two pairs of permanent magnets are arranged diagonally opposite each other.

[0034] When the shift actuator of the movable unit 3 does not perform a shift drive, that is, when the center of the vibration-damping lens L1 of the movable unit 3 coincides with the optical axis center, this becomes the shift center position (origin position) of the shift drive stroke. At this shift drive center position, the two sets of permanent magnets (first permanent magnet 51 and second permanent magnet 52) ​​are arranged so that the center of the second permanent magnet 52 and the inner diameter center of the first permanent magnet 51 coincide in a direction perpendicular to the optical axis OA.

[0035] Figure 6 shows the relationship between the shift position and the repulsive force in the shift direction when the movable unit 3 is shifted relative to the fixed unit 2 in a direction perpendicular to the optical axis OA. The black triangles in Figure 6 represent the measured values ​​of the repulsive force using conventional viscoelastic materials, and the black rectangles represent the simulated values ​​of the repulsive force according to the present invention. Referring to Figure 6, when the shift position is 0 (shift center), the repulsive force is 0. In other words, when no shift drive is performed, the magnetic forces of each are balanced, and in the direction perpendicular to the optical axis OA, the second permanent magnet 52 is positioned at the center of the through hole 511 of the first permanent magnet 51, and the movable unit 3 is held at the shift center.

[0036] As the movable unit 3 shifts relative to the fixed unit 2 from the shift center in the yaw and pitch directions, the two sets of permanent magnets generate a repulsive force that returns the movable unit 3 to the shift center, and it can be seen that the repulsive force increases as the amount of shift increases. As a result, when the shift actuator drives the shift, it becomes possible to apply a damping effect to the movement of the movable unit 3. In other words, it becomes possible to obtain a damper effect that improves the controllability of the runout correction device 1.

[0037] Furthermore, Figure 6 shows the measured values ​​of the repulsive force using a conventional viscoelastic material (black triangles in Figure 6) and the simulated values ​​of the repulsive force according to the present invention (black rectangles in Figure 6). As shown in Figure 6, both are shown to be able to generate similar repulsive forces, indicating that the same braking effect as in the conventional method can be achieved with this configuration as well.

[0038] Furthermore, in order to obtain a repulsive force in a direction perpendicular to the optical axis OA direction, the gap between the inner diameter of the through hole 511 provided in the center of the first permanent magnet 51 and the outer diameter of the second permanent magnet 52 is made larger than the shift drive amount by which the movable unit 3 moves when the shake correction device corrects image shake.

[0039] On the other hand, in terms of the positional relationship of the two sets of permanent magnets in the direction of the optical axis OA, the image sensor side 6 of the first permanent magnet 51 (the other side) is positioned closer to the image sensor 6 than the image sensor side 6 of the second permanent magnet 52 (the other side). In other words, in terms of the positional relationship of the two sets of permanent magnets in the direction of the optical axis OA, the image side 5 of the second permanent magnet 52 (the one side) is positioned closer to the image sensor 5 than the image side 5 of the first permanent magnet 51 (the one side).

[0040] In the optical axis OA direction, when the second permanent magnet 52 is inserted into the through hole 511 provided in the center of the first permanent magnet 51, a force is generated in a direction of mutual repulsion in the case of the magnetization relationship described above. Therefore, a force is generated in a direction of mutual attraction between the shift base 21, which holds the first permanent magnet 51, and the shift lens barrel 31, which holds the second permanent magnet 52. As a result, unless an external force greater than the magnetic force acts, the ball 41, which is sandwiched between the two parts, is always held in contact with the shift base 21 and the shift lens barrel 31 in the optical axis OA direction. In other words, the three balls 4 come into contact with the shift lens barrel 31 of the movable unit 3 and the shift base 21 of the fixed unit 2, respectively, in the direction along the optical axis OA, due to the repulsive force of the pair of permanent magnets, the first permanent magnet 51 and the second permanent magnet 52. The movable unit 3 is then positioned in the optical axis OA direction relative to the fixed unit 2 by coming into contact with the three balls 41.

[0041] Figure 7 shows the simulated values ​​of the shift position and the repulsive force in the direction of the optical axis OA when the movable unit 3 in the configuration of this embodiment is driven to shift relative to the fixed unit 2 in a direction perpendicular to the optical axis OA. Referring to Figure 7, it can be seen that a constant repulsive force is always generated regardless of the shift position. As a result, as mentioned above, unless an external force greater than the magnetic force acts, the ball 41 can be held in a state where it is always in contact with the shift base 21 and the shift lens barrel 31 in the direction of the optical axis OA.

[0042] Thus, the pair of permanent magnets generate a repulsive force between the movable unit 3 and the fixed unit 2 in a direction along the optical axis OA and in a direction perpendicular to the optical axis. In other words, the pair of permanent magnets in this embodiment are positioned to exert magnetic force in a direction that brings the movable unit 3 and the fixed unit 2 closer together in the direction along the optical axis OA, and in a direction that returns them to their origin position in the direction perpendicular to the optical axis.

[0043] As described above, in this embodiment, viscoelastic members are not used, and a configuration using multiple permanent magnets is employed to suppress overcorrection by the runout correction device 1. Therefore, there is no need to consider the precautions that arise when using viscoelastic members (such as the need for short-term use, attention to attachment position, and UV irradiation at the appropriate position). Consequently, by adopting the configuration of the runout correction device 1 in this embodiment, the time required in the assembly process of the runout correction device can be significantly reduced compared to when viscoelastic members are used, and the increase in assembly costs can also be suppressed.

[0044] Here, the insertion amount of the second permanent magnet 52 relative to the first permanent magnet 51 in the optical axis OA direction is determined by considering the shock resistance standard of the shake correction device 1, the weight of the movable unit, and the balance of the magnetic forces of the permanent magnets. In order to obtain the desired repulsive force in the optical axis OA direction, the position of the optical axis OA direction surface (hereinafter referred to as the other side surface) of the image sensor side 6 of the second permanent magnet 52 is positioned in a region from the first position to the second position in the direction along the optical axis OA. The first position is the position where the image sensor side 6 surface (one side surface) of the first permanent magnet 51 and the image sensor side 6 surface (one side surface) of the second permanent magnet 52 coincide. The second position is the position where the image side 5 surface (image side surface) of the first permanent magnet 51 and the image sensor side 6 surface of the second permanent magnet 52 coincide. That is, both permanent magnets (first permanent magnet 52 and second permanent magnet 53) need to be positioned in this region. Furthermore, the position of the second permanent magnet 52 on the image side 5 in the direction of the optical axis OA must be positioned on the image side 5, more so than the position of the first permanent magnet 51 on the image side 5.

[0045] As described above, the runout correction device 1 of this embodiment does not use a viscoelastic member, is easy to assemble, and makes it possible to more easily suppress overcorrection by the runout correction device.

[0046] <Embodiment 2> The following describes the shake correction device 1 in Embodiment 2. Figure 8 is a cross-sectional view of the shake correction device 1 in Embodiment 2, taken through the optical axis OA. Embodiment 2 describes the case in which the second permanent magnet for suppressing overcorrection of image shake has a frustoconical structure. In Embodiment 2, the same structure and configuration as in Embodiment 1 will not be described, and the differences from Embodiment 1 will be described. Therefore, for example, the explanation of parts that overlap with the explanation of the structure when the second permanent magnet 52 shown in Figure 5 is cylindrical will be omitted.

[0047] The shifting lens barrel 31 has two second permanent magnets 52 to suppress overcorrection of image shake. A magnet mounting section 315 extends in the direction of the optical axis OA. A second permanent magnet 52 is fixed to this magnet mounting section 315 by means of adhesive or screws.

[0048] In Embodiment 2, each of the second permanent magnets 52 is formed in a frustoconical shape. A recess is provided in the center of the second permanent magnet 52 for attaching the magnet mounting portion (projection) 315. The projection 315 is formed on the shift lens barrel 31 of the movable unit 3 so as to extend (project) in the direction of the optical axis OA and toward the image side 5, similar to Embodiment 1. The second permanent magnet 52 is then positioned on the magnet mounting portion 315 by inserting the recessed portion into the magnet mounting portion 315. The magnet is then fixed in place by applying adhesive or screwing it in while the recessed portion is attached to the magnet mounting portion 315.

[0049] The first permanent magnet is mounted on the magnet mounting section 315 such that, when viewed from a direction along the optical axis OA, the side with the largest outer diameter is the image side 5 and the side with the smallest outer diameter is the image sensor side 6. In other words, when viewed from a direction along the optical axis OA, a recess is formed on the side with the smallest outer diameter (the image sensor side 6 in the direction along the optical axis OA).

[0050] In terms of the relative positions of the two sets of permanent magnets in the direction of the optical axis OA, the surface of the first permanent magnet 51 facing the image sensor 6 is positioned closer to the image sensor 6 than the surface of the second permanent magnet 52 facing the image sensor 6. In other words, in terms of the relative positions of the two sets of permanent magnets in the direction of the optical axis OA, the image-side surface 5 (one side surface) of the second permanent magnet 52 is positioned closer to the image sensor 5 than the image-side surface 5 (one side surface) of the first permanent magnet 51.

[0051] In the optical axis OA direction, when the second permanent magnet 52 is inserted into the through hole 511 provided in the center of the first permanent magnet 51, a force is generated in a direction of mutual repulsion in the case of the magnetization relationship described above. Here, the second permanent magnet 52 in Embodiment 2 has a shape in which the outer diameter increases towards the image side 5, so compared to the cylindrical shape in Embodiment 1, the sensitivity of the repulsive force to misalignment with the first permanent magnet 51 in the optical axis OA direction is reduced. Therefore, even if the mounting position of the second permanent magnet 52 relative to the first permanent magnet 51 is slightly off due to manufacturing errors of the parts, it is possible to construct the device without a significant decrease in the desired repulsive force.

[0052] As described above, by configuring the runout correction device 1 of Embodiment 2, it is possible to ensure a stable rebound force even during mass production. Furthermore, similar to the runout correction device 1 of Embodiment 1, it does not use viscoelastic members, making assembly easy and allowing for easier suppression of overcorrection by the runout correction device.

[0053] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its essence. Furthermore, the above embodiments may be implemented in combination.

[0054] This embodiment includes the following configuration.

[0055] (Composition 1) A movable unit that holds the lens and is movable in a direction perpendicular to the optical axis of the lens, A fixed unit that holds the movable unit, A rolling ball is positioned between the movable unit and the fixed unit in a direction along the optical axis, and rolls when the movable unit moves relative to the fixed unit, The movable unit and the fixed unit each have one or more pairs of permanent magnets, The pair of permanent magnets generate repulsive forces between the movable unit and the fixed unit in a direction along the optical axis and in a direction perpendicular to the optical axis. A vibration correction device characterized by the following:

[0056] (Configuration 2) The vibration correction device according to configuration 1, characterized in that the pair of permanent magnets consists of a first permanent magnet and a second permanent magnet formed in a cylindrical shape.

[0057] (Composition 3) The vibration correction device according to configuration 2, characterized in that the magnetization directions of the first permanent magnet and the second permanent magnet are configured to repel each other.

[0058] (Composition 4) The first permanent magnet has a through hole in its center, The runout correction device according to configuration 2 or 3, characterized in that at least a portion of the second permanent magnet is inserted into the through hole of the first permanent magnet.

[0059] (Composition 5) The vibration correction device according to any one of configurations 2 to 4, characterized in that the second permanent magnet is positioned in a direction along the optical axis and not inserted into the through hole.

[0060] (Composition 6) The first permanent magnet has a through hole in its center, The movable unit has a protruding portion that is formed to protrude toward the image side in a direction along the optical axis, The vibration correction device according to any one of configurations 2 to 5, characterized in that the second permanent magnet is attached to the protruding portion so that part or all of the second permanent magnet is inserted into the through hole of the first permanent magnet in a direction along the optical axis.

[0061] (Composition 7) The shake correction device according to any one of configurations 2 to 6, characterized in that the second permanent magnet is arranged in a region from a position where the image sensor-side surface of one side of the first permanent magnet coincides with the image sensor-side surface of one side of the second permanent magnet, in a direction along the optical axis, to a position where the image-side surface of the other side of the first permanent magnet coincides with the image sensor-side surface of the second permanent magnet.

[0062] (Composition 8) The vibration correction device according to any one of configurations 1 to 7, characterized in that the pair of permanent magnets are positioned to exert magnetic force in a direction that brings the movable unit and the fixed unit closer together in the direction along the optical axis, and in a direction that returns them to the origin position in the direction perpendicular to the optical axis.

[0063] (Composition 9) The runout correction device according to any one of configurations 2 to 7, characterized in that the first permanent magnet is formed in a frustoconical shape.

[0064] (Composition 10) The movable unit has a protruding portion that is formed to protrude toward the image side in a direction along the optical axis, The shake correction device according to configuration 9, characterized in that the second permanent magnet is attached to the protrusion such that, when viewed from a direction along the optical axis, the side with the largest outer diameter is on the image side and the side with the smallest outer diameter is on the image sensor side.

[0065] (Composition 11) The shake correction device according to any one of configurations 2 to 7, characterized in that the image-side surface, which is one side of the second permanent magnet in the direction along the optical axis, is located on the image side of the position of the image-side surface, which is one side of the first permanent magnet in the direction along the optical axis.

[0066] (Composition 12) The first permanent magnet has a through hole in its center, The runout correction device according to any one of configurations 2 to 7, characterized in that the gap between the inner diameter of the through hole of the first permanent magnet and the outer diameter of the second permanent magnet is greater than the shift drive amount of the movable unit.

[0067] (Composition 13) The vibration correction device according to any one of configurations 1 to 12, characterized in that the rolling balls contact the movable unit and the fixed unit respectively in a direction along the optical axis due to the repulsive force of the pair of permanent magnets.

[0068] (Composition 14) The pair of permanent magnets is composed of a first permanent magnet and a second permanent magnet. A vibration correction device according to any one of configurations 1 to 13, characterized in that a plurality of pairs of permanent magnets are arranged in the vibration correction device.

[0069] (Composition 15) Having two of the aforementioned pair of permanent magnets, The vibration correction device according to any one of configurations 1 to 14, characterized in that the two pairs of permanent magnets are arranged in the vibration correction device at diagonal positions.

[0070] (Composition 16) Lens and, A vibration correction device, comprising any one of configurations 1 to 15, An optical device characterized by the following features.

[0071] (Composition 17) Image sensor and The optical device described in configuration 16, An imaging device characterized by the following features. [Explanation of symbols]

[0072] 1. Runway correction device 2 Fixed Units 3 Movable Units 41 Ball 51. First permanent magnet 52. Second permanent magnet

Claims

1. A movable unit that holds the lens and is movable in a direction perpendicular to the optical axis of the lens, A fixed unit that holds the movable unit, A rolling ball is positioned between the movable unit and the fixed unit in a direction along the optical axis, and rolls when the movable unit moves relative to the fixed unit, The movable unit and the fixed unit each have one or more pairs of permanent magnets, The pair of permanent magnets generate repulsive forces between the movable unit and the fixed unit in a direction along the optical axis and in a direction perpendicular to the optical axis. A vibration correction device characterized by the following:

2. The runout correction device according to claim 1, characterized in that the pair of permanent magnets is composed of a first permanent magnet and a second permanent magnet formed in a cylindrical shape.

3. The vibration correction device according to claim 2, characterized in that the magnetization directions of the first permanent magnet and the second permanent magnet are configured to repel each other.

4. The first permanent magnet has a through hole in its center, The runout correction device according to claim 2, characterized in that at least a portion of the second permanent magnet is inserted into the through hole of the first permanent magnet.

5. The vibration correction device according to claim 2, characterized in that the second permanent magnet is positioned in a direction along the optical axis and not inserted into the through hole.

6. The first permanent magnet has a through hole in its center, The movable unit has a protruding portion that is formed to protrude toward the image side in a direction along the optical axis, The vibration correction device according to claim 2, characterized in that the second permanent magnet is attached to the protruding portion so that part or all of the second permanent magnet is inserted into the through hole of the first permanent magnet in a direction along the optical axis.

7. The shake correction device according to claim 2, characterized in that the second permanent magnet is arranged in a region from a position where the image sensor-side surface of one side of the first permanent magnet coincides with the image sensor-side surface of one side of the second permanent magnet, in a direction along the optical axis, to a position where the image-side surface of the other side of the first permanent magnet coincides with the image sensor-side surface of the second permanent magnet.

8. The vibration correction device according to claim 1, characterized in that the pair of permanent magnets are positioned to exert magnetic force in a direction that brings the movable unit and the fixed unit closer together in the direction along the optical axis, and in a direction that returns them to the origin position in the direction perpendicular to the optical axis.

9. The runout correction device according to claim 2, characterized in that the first permanent magnet is formed in a frustoconical shape.

10. The movable unit has a protruding portion that is formed to protrude toward the image side in a direction along the optical axis, The shake correction device according to claim 9, characterized in that the second permanent magnet is attached to the protruding portion such that, when viewed from a direction along the optical axis, the side with the largest outer diameter is on the image side and the side with the smallest outer diameter is on the image sensor side.

11. The shake correction device according to claim 2, characterized in that the image-side surface, which is one of the surfaces of the second permanent magnet in the direction along the optical axis, is located on the image side of the position of the image-side surface, which is one of the surfaces of the first permanent magnet in the direction along the optical axis.

12. The first permanent magnet has a through hole in its center, The runout correction device according to claim 2, characterized in that the gap between the inner diameter of the through hole of the first permanent magnet and the outer diameter of the second permanent magnet is greater than the shift drive amount of the movable unit.

13. The runout correction device according to claim 1, characterized in that the rolling balls contact the movable unit and the fixed unit respectively in a direction along the optical axis due to the repulsive force of the pair of permanent magnets.

14. The pair of permanent magnets is composed of a first permanent magnet and a second permanent magnet. The vibration correction device according to claim 1, characterized in that a plurality of pairs of permanent magnets are arranged in the vibration correction device.

15. Having two of the aforementioned pair of permanent magnets, The vibration correction device according to claim 1, characterized in that the two pairs of permanent magnets are arranged in the vibration correction device at diagonal positions.

16. Lens and, A runout correction device according to any one of claims 1 to 15, An optical device characterized by the following features.

17. Image sensor and The optical device described in claim 16, comprising: An imaging device characterized by the following features.

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