Image stabilizer, lens barrel, and imaging device

Abstract

In order to reduce sound to be generated when a lock ring is driven, this blur correction device comprises: a lens holding frame that holds a lens: a holding frame that movably holds the lens holding frame; a first driving part that drives the lens holding frame in a direction crossing the optical axis with respect to the holding frame; a lock member that moves between a lock position at which the movement of the lens holding frame is restricted and a lifting position at which the restriction is lifted; and a detection part that detects the amount of movement of the lock member.　

Description

[Technical Field]

[0001] The present invention relates to a vibration reduction device, a lens barrel, and an imaging device. [Background technology]

[0002] As a vibration reduction device that suppresses blurring of captured images due to camera shake or the like, one has been proposed that includes a movable frame that holds a lens for vibration reduction, a fixed frame that holds the movable frame so that it can move relative to the frame, and a lock ring that fixes the movable frame when vibration reduction is not being performed (see, for example, Patent Document 1). There is a demand for quieter operation of the lock ring. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-169128 Summary of the Invention

[0004] According to a first aspect, a motion compensation device includes: a lens holding frame that holds a lens; a holding frame that movably holds the lens holding frame; a first drive unit that drives the lens holding frame relative to the holding frame in a direction intersecting an optical axis; a locking member that moves between a locking position that restricts movement of the lens holding frame and a release position that releases the restriction; and a detection unit that detects the amount of movement of the locking member, the locking member engages with a restricting member when the locking member is in the locked position, and the restricting member biases the locking member in a direction opposite to a direction from the locked position to the released position, The first drive unit has a magnet, a coil, and a yoke, the yoke is not positioned between the holding frame and the locking member in the optical axis direction, the holding frame has a protrusion that protrudes toward the locking member in the optical axis direction, and the protrusion comes into contact with the locking member in at least one of the locked position and the released position.

[0005] According to a second aspect, a lens barrel includes the above-described image stabilization device.

[0006] According to a third aspect, an imaging device includes the above-described image stabilization device.

[0007] The configurations of the embodiments described below may be modified as appropriate, and at least a portion of the configuration may be replaced with other components. Furthermore, components that are not particularly limited in terms of their placement may be placed in any position that can achieve their function, not limited to the placement disclosed in the embodiments. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram showing a camera including a lens barrel equipped with a shake correction device according to an embodiment, and a camera body. [Figure 2] FIG. 2 is an exploded perspective view of the image stabilization device. [Figure 3] FIG. 3 is a cross-sectional view of the image stabilization device. [Figure 4] 4(A) and 4(B) are diagrams of the image stabilization device as seen from the camera body side. [Figure 5] FIG. 5(A) is a perspective view of the lock ring, FIG. 5(B) is a cross-sectional view showing the relationship between the lock ring and the fixed frame, and FIG. 5(C) is a diagram showing the change in the signal level output from the photointerrupter as the lock ring moves. [Figure 6] FIG. 6 is a flowchart showing a process for controlling the motor. [Figure 7] FIG. 7 is a timing diagram for explaining the process of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] A shake correction device 80 according to one embodiment will be described in detail below with reference to the drawings. Note that an XYZ Cartesian coordinate system is provided in the drawings as appropriate to facilitate explanation and understanding. In this coordinate system, the +Z direction is the direction from the subject toward the camera body 101 when the photographer is shooting a landscape image with the optical axis OA horizontal (hereinafter referred to as the normal position). Also, the +X direction is the direction toward the right when viewed from the camera body 101 in the normal position. Also, the +Y direction is the direction toward the top in the normal position. Note that the scales of the shapes, lengths, thicknesses, etc. of the various parts shown in the embodiments do not necessarily correspond to the actual objects, and some elements may be omitted from the drawings to facilitate understanding.

[0010] 1 is a diagram showing a camera 1 that includes a lens barrel 100 that includes an image stabilization device 80 according to this embodiment, and a camera body 101. Note that in this embodiment, lens barrel 100 is detachable from camera body 101, but this is not limiting, and lens barrel 100 and camera body 101 may also be integrated.

[0011] Camera body 101 includes an image sensor IS and a control unit 112. The image sensor IS is configured with a photoelectric conversion element such as a CCD (Charge Coupled Device), and converts the subject image formed by the imaging optical system (lens barrel 100 attached to camera body 101) into an electrical signal.

[0012] The control unit 112 is equipped with a CPU (Central Processing Unit) and the like, and controls the overall operation of the camera 1 related to photography, including focusing drive in the camera body 101 and the attached lens barrel 100, and blur correction of captured images due to camera shake, etc.

[0013] As shown in Fig. 1, the lens barrel 100 according to this embodiment includes a fixed barrel 10. In this embodiment, the fixed barrel 10 is made up of multiple parts, but it may also be made up of a single part. As shown in Fig. 1, a lens mount LM is fixed to the fixed barrel 10, which enables the lens barrel 100 to be attached to and detached from a camera body 101.

[0014] Lens barrel 100 also includes multiple lens groups L1 to L9 arranged in sequence along a common optical axis OA. Lens group L4 is held by lens holding frame F4, lens group L6 is held by lens holding frame F6, and lens group L8 is held by lens holding frame F8. The other lens groups are held by fixed barrel 10. Each of lens groups L1 to L9 may be made up of a single lens or multiple lenses.

[0015] The lens group L6 is a vibration reduction (VR) lens, and when performing vibration reduction, it can be moved in a plane perpendicular to the optical axis OA by a vibration reduction device 80, which will be described later.

[0016] FIG. 2 is an exploded perspective view of the image stabilization device 80. As shown in FIG.

[0017] As shown in FIG. 2, the image stabilization device 80 includes a movable frame 60, a holding frame 30, and a lock ring 20.

[0018] The movable frame 60 holds the lens group L6 via the lens holding frame F6, and moves within the XY plane perpendicular to the optical axis OA (Z axis).

[0019] The holding frame 30 includes a base member 40 and a fixed frame 50. As shown in Fig. 2, the base member 40 is a substantially annular member having a circular hole 41 in the center, and unlike the movable frame 60, it does not move within a plane perpendicular to the optical axis OA, but holds the movable frame 60 so that it can move relatively within the plane perpendicular to the optical axis OA. More specifically, the base member 40 holds the movable frame 60 via a steel ball 43 and a coil spring 42.

[0020] The movable frame 60 and the base member 40 are biased toward each other by a coil spring 42, with a steel ball 43 sandwiched between them. The coil spring 42 connects the base member 40 and the movable frame 60 in the direction of the optical axis OA, and prevents the base member 40 and the movable frame 60 from separating in the direction of the optical axis OA.

[0021] The base member 40 and the movable frame 60 each have a contact surface that comes into contact with the steel ball 43 at the position where the steel ball 43 is disposed. When the movable frame 60 moves in a plane perpendicular to the optical axis OA, the steel ball 43 rotates between the contact surface of the base member 40 and the contact surface of the movable frame 60. This allows the movable frame 60 to move parallel to the base member 40 with low friction.

[0022] The fixed frame 50 is a substantially annular member having a circular hole 51 in the center. Unlike the movable frame 60, the fixed frame 50 does not move within a plane perpendicular to the optical axis OA.

[0023] Next, the driving of the lens group L6 will be described. FIG. 3 is a cross-sectional view of the image stabilization device 80. The lens group L6 held by the movable frame 60 is moved within the XY plane by VCMs (voice coil motors) 90X and 90Y to correct image blur. The VCM 90X is an actuator for driving the lens group L6 in the X-axis direction, and includes an X-axis drive coil 61X, a pair of X-axis drive magnets 52X, and a yoke 53X. The VCM 90Y is an actuator for driving the lens group L6 in the Y-axis direction, and includes a Y-axis drive coil 61Y, a pair of Y-axis drive magnets 52Y, and a yoke 53Y. The pair of X-axis drive magnets 52X and the pair of Y-axis drive magnets 52Y are in-plane dipole magnetized magnets having two poles, north and south.

[0024] In this embodiment, an X-axis direction drive coil 61X and a Y-axis direction drive coil 61Y for driving in the Y-axis direction are attached to the movable frame 60. Meanwhile, a yoke 53X is attached to the fixed frame 50 at a position corresponding to the X-axis direction drive coil 61X, and an X-axis direction drive magnet 52X is attached to the yoke 53X. Furthermore, a yoke 53Y is attached to the movable frame 60 at a position corresponding to the Y-axis direction drive coil 61Y, and a Y-axis direction drive magnet 52Y is attached to the yoke 53Y.

[0025] 3, by passing a current through the Y-axis direction drive coil 61Y arranged between the Y-axis direction drive magnets 52Y, the Y-axis direction drive coil 61Y receives a Lorentz force and drives the movable frame 60 in the Y-axis direction. This allows the lens group L6 held by the movable frame 60 to move in the Y-axis direction. Alternatively, the yoke 53Y and the Y-axis direction drive magnet 52Y may be attached to the movable frame 60, and the Y-axis direction drive coil 61Y may be attached to the fixed frame 50. The same applies to the VCM90X, so a detailed description will be omitted.

[0026] The lock ring 20 is a substantially annular member having a circular hole 21 in the center, and is a member for locking the movable frame 60 so that it does not move relative to the holding frame 30 when shake correction is not being performed.

[0027] Figures 4(A) and 4(B) are views of image stabilization device 80 as viewed from the camera body 101 side. Note that Figure 4(A) shows the case where lock ring 20 is in an unlocked position that allows movement of lens group L6 in a plane perpendicular to optical axis OA, while Figure 4(B) shows the case where lock ring 20 is in a locked position that restricts movement of lens group L6 in a plane perpendicular to optical axis OA. Also, the diagrams at the bottom left of Figures 4(A) and 4(B) are enlarged views of the dotted line portions.

[0028] The lock ring 20 is rotated around the optical axis OA by a motor 70 (see FIG. 2) attached to the fixed frame 50, and moves between a locked position where it restricts movement of the movable frame 60 and an unlocked position where it releases the restriction.

[0029] More specifically, as shown in Figures 2, 4(A), and 4(B), a gear portion 22 is formed on the outer periphery of the lock ring 20, which meshes with a pinion gear 71 attached to the rotary shaft of the motor 70. This transmits the rotational force of the motor 70 to the lock ring 20, and the lock ring 20 is driven to the locked position (Figure 4(B)) and the unlocked position (Figure 4(A)) by the forward and reverse rotation of the motor 70. The motor 70 may be a DC motor, a stepping motor, an ultrasonic motor, or the like.

[0030] As shown in Fig. 2, protrusions 23 protruding toward the optical axis OA and gaps 24 are formed alternately in the circumferential direction on the inner peripheral surface of the lock ring 20. When the lock ring 20 is in the locked position, the protrusions 23 abut against the protrusions 66 of the movable frame 60, prohibiting movement of the movable frame 60. When the lock ring 20 is rotated around the optical axis OA from the locked position to the unlocked position, the abutment between the protrusions 23 and the protrusions 66 of the movable frame 60 is released, and in the unlocked position, the protrusions 66 face the gaps 24 formed between the protrusions 23. This allows the movable frame 60 to move for image stabilization operation.

[0031] In this embodiment, a restricting member 58 that restricts movement of the lock ring 20 is attached to the fixed frame 50 so that the lock ring 20 will not move from the locked position due to impact or vibration when the lock ring 20 is in the locked position. The restricting member 58 is, for example, a leaf spring.

[0032] A recess 29 is provided on the outer peripheral surface of the lock ring 20 with which the tip of the restricting member 58 comes into contact. The recess 29 is positioned so that it does not engage with the tip of the restricting member 58 when the lock ring 20 is in the unlocked position, but engages with the tip of the restricting member 58 when the lock ring 20 is in the locked position. Therefore, when the lock ring 20 is in the locked position, the tip of the restricting member 58 engages with the recess 29, urging the lock ring 20 in the direction opposite to the direction in which the lock ring 20 moves from the locked position to the unlocked position. This allows the lock ring 20 to be reliably fixed in the locked position.

[0033] The lock ring 20 has a first contact portion 25 that, when driven to the unlock position, comes into contact with one end of an elastic member 54 attached to the fixed frame 50 to stop the lock ring 20, and a second contact portion 26 that, when driven to the locked position, comes into contact with the other end of the elastic member 54 to stop the lock ring 20. The elastic member 54 is made of, for example, rubber.

[0034] Here, it is desirable that the time required for the lock ring 20 to move from the locked position to the unlocked position, and the time required for the lock ring 20 to move from the unlocked position to the locked position, be short. Therefore, it is conceivable to increase the movement speed (rotation speed) of the lock ring 20.

[0035] However, if the movement speed (rotation speed) of lock ring 20 remains high when first contact portion 25 or second contact portion 26 comes into contact with elastic member 54, the impact when first contact portion 25 or second contact portion 26 comes into contact with elastic member 54 will be large, and there is a possibility that a loud noise will be generated. Therefore, when first contact portion 25 or second contact portion 26 comes into contact with elastic member 54, it is desirable that the movement speed of lock ring 20 be low.

[0036] In response to this, for example, it is conceivable to reduce the rotation speed (rpm) of the motor 70 when a predetermined time has elapsed since the start of driving the motor 70, thereby reducing the movement speed of the lock ring 20 before the first contact portion 25 or the second contact portion 26 comes into contact with the elastic member 54. However, if the drive of the motor 70 is controlled based on the elapsed time since the start of driving the motor 70, the exact movement amount of the lock ring 20 cannot be determined. Therefore, due to individual differences in the lock ring 20, there is a risk that the first contact portion 25 or the second contact portion 26 will come into contact with the elastic member 54 before the movement speed of the lock ring 20 is reduced. In this case, it is not possible to reduce the collision noise between the first contact portion 25 or the second contact portion 26 and the elastic member 54. Furthermore, for example, there is a risk that the drive of the motor 70 will be stopped before the first contact portion 25 or the second contact portion 26 comes into contact with the elastic member 54, and the lock ring 20 will not reach the locked position or the unlocked position.

[0037] Therefore, in this embodiment, a detection unit is provided that detects the amount of movement (amount of rotation) of the lock ring 20, and based on the amount of movement of the lock ring 20 detected by the detection unit, the motor 70 is controlled to control the movement speed (rotation speed) of the lock ring 20.

[0038] Fig. 5(A) is a perspective view of the lock ring 20, and Fig. 5(B) is a cross-sectional view showing the relationship between the lock ring 20 and the fixed frame 50. In Fig. 5(A), the diagram on the lower left is an enlarged view of the dotted line portion.

[0039] 5(A), a comb-tooth portion 27 for detecting the amount of movement of the lock ring 20 is provided on the outer periphery of the lock ring 20. The comb-tooth portion 27 is disposed in a groove 59 formed in the fixed frame 50.

[0040] A photointerrupter 57 is provided in the groove 59 of the fixed frame 50. The photointerrupter 57 has a light-emitting portion 57a ​​and a light-receiving portion 57b that faces the light-emitting portion 57a ​​across the comb-tooth portion 27 and receives light emitted from the light-emitting portion 57a. Note that in FIG. 5(B), the light-emitting portion 57a ​​and the light-receiving portion 57b may be arranged in reverse.

[0041] FIG. 5C is a diagram showing changes in the signal level output from the photointerrupter 57 as the lock ring 20 moves. As shown in FIG. 5C, when the lock ring 20 moves, the comb teeth 27 block light passing between the light-emitting portion 57a ​​and the light-receiving portion 57b, causing a change in the output signal level of the photointerrupter 57. The output signal of the photointerrupter 57 is an analog signal, which is converted into a digital signal by, for example, a comparator. For example, the comparator outputs an ON signal when the output signal level of the photointerrupter 57 is equal to or greater than a first threshold, and outputs an OFF signal when the output signal level is equal to or less than a second threshold that is smaller than the first threshold. The amount of movement of the lock ring 20 can be detected based on the number of edges of the digital signal output from the comparator.

[0042] Next, the control of the motor 70 (control of the movement speed of the lock ring 20) according to the amount of movement of the lock ring 20 detected using the comb-tooth portion 27 and the photointerrupter 57 will be described.

[0043] Fig. 6 is a flowchart showing the process of controlling the motor 70. In this embodiment, an example will be described in which the control unit 112 provided in the camera body 101 controls the motor 70, but the motor 70 may also be controlled by a control unit provided in the lens barrel 100. Fig. 7 is a timing diagram for explaining the process of Fig. 6. Note that in Fig. 7, the numbers written above the comparator output signal indicate the number of edges.

[0044] 6 starts when a command is issued to move the lock ring 20 from the locked position to the unlocked position, or from the unlocked position to the locked position. In the following description, it is assumed that the lock ring 20 is rotated clockwise (forward) from the locked position to the unlocked position.

[0045] In the process of Fig. 6, first, in step S11, the control unit 112 starts counting the number of edges of the comparator output signal. For example, in Fig. 7, assume that the control unit 112 receives a command to move the lock ring 20 to the unlock position at time t1. In this case, the control unit starts counting the number of edges of the comparator output signal from time t1.

[0046] Next, in step S12, the control unit 112 starts energizing the motor 70 at a first duty ratio D1. In the example of FIG. 7, energization is started at time t1 to energize the motor 70 at the first duty ratio D1. This causes the lock ring 20 to move (rotate) at, for example, a first speed. Here, the duty ratio D is the ratio of the time τ during which a voltage is applied to the time during which a short brake is applied, within a predetermined period T, and is expressed as D=τ / T. Furthermore, the short brake is a process of shorting the terminals of the motor 70 to temporarily stop the motor 70 from moving.

[0047] Next, in step S13, the control unit 112 determines whether a predetermined time Ta has elapsed since the start of energizing the motor 70 at the first duty ratio D1. Here, the predetermined time Ta is, for example, 3 ms, which is set to a time sufficient for the pinion gear 71 attached to the rotary shaft of the motor 70 to rotate idle by an amount corresponding to backlash and mesh with the gear portion 22 of the lock ring 20. The first duty ratio D1 is set to a value sufficient to reduce the impact noise when the pinion gear 71 comes into contact with the gear portion 22.

[0048] When the specified time Ta has not elapsed (step S13 / NO), the control unit 112 continues to energize at the first duty ratio D1. On the other hand, when the specified time Ta has elapsed (step S13 / YES), the process proceeds to step S15, and the control unit 112 energizes the motor 70 at a second duty ratio D2 that is greater than the first duty ratio D1. For example, in the example of FIG. 7, at time t2 when the specified time Ta has elapsed from time t1, the control unit 112 changes the duty ratio of the energization to the motor 70 from the first duty ratio D1 to the second duty ratio D2 (D1 < D2). As a result, as shown in FIG. 7, since the rotational speed of the motor 70 increases, the moving speed of the lock ring 20 increases from the first speed to the second speed. Thus, when the pinion gear 71 meshes with the gear portion 22 of the lock ring 20, the control unit 112 increases the moving speed of the lock ring 20, so that the time until the lock ring 20 reaches the lock position or the unlock position can be shortened.

[0049] Next, in step S17, the control unit 112 determines whether the number of edges counted in step S11 is less than a threshold value (for example, 7 edges). In step S17, it is determined whether the lock ring 20 has moved a predetermined amount (predetermined angle). The threshold value of the number of edges is set within the range of the amount of movement in which the lock ring 20 does not contact the elastic member 54.

[0050] When the number of edges is less than the threshold value (step S17 / YES), the control unit 112 continues to energize the motor 70 at the second duty ratio D2. On the other hand, when the number of edges is greater than or equal to the threshold value (step S17 / NO), the process proceeds to step S19, and the control unit 112 energizes the motor 70 at a third duty ratio D3 that is smaller than the second duty ratio D2. For example, when the threshold value of the number of edges is 7, as shown in FIG. 7, the control unit 112 changes the duty ratio of the energization to the motor 70 from the second duty ratio D2 to the third duty ratio D3 (D3 < D2) at the time t3 when the number of edges reaches the threshold value 7. As a result, as shown in FIG. 7, since the rotational speed of the motor 70 decreases, the moving speed of the lock ring 20 also decreases from the second speed to the third speed. Before the lock ring 20 contacts the elastic member 54, the moving speed of the lock ring 20 can be decreased, so that the impact force when the lock ring 20 collides with the elastic member 54 can be reduced and the collision sound can be decreased.

[0051] Next, in step S21, the control unit 112 determines whether or not a predetermined time Tc (for example, 10 [ms]) has elapsed since the start of energization at the third duty ratio D3. The predetermined time Tc is set to a time that can ensure that the lock ring 20 contacts the elastic member 54 attached to the fixed frame 50 if the motor 70 is energized for the predetermined time Tc at the third duty ratio D3 after the lock ring 20 has moved a predetermined amount.

[0052] When the predetermined time Tc has not elapsed (step S21 / NO), the control unit 112 continues to energize at the third duty ratio D3. On the other hand, when the predetermined time Tc has elapsed (step S21 / YES), the process proceeds to step S23, and the control unit 112 puts the motor 70 in a short brake state and ends the process. That is, the control unit 112 stops driving the motor 70 after the lock ring 20 contacts the elastic member 54. In the example shown in FIG. 7, the control unit 112 puts the motor 70 in a short brake state and ends the process at the time t4 when the predetermined time Tc has elapsed from the time t3. Thereby, the lock ring 20 can be reliably moved to the lock position.

[0053] Note that the first duty ratio D1 may be the same as the third duty ratio D3, or may be larger or smaller than the third duty ratio D3, as long as it is smaller than the second duty ratio D2.

[0054] As described above in detail, according to this embodiment, the image stabilization device 80 includes the movable frame 60 that holds the lens group L6, the holding frame 30 that movably holds the movable frame 60, the VCMs 90X and 90Y that drive the movable frame 60 relative to the holding frame 30 in a direction intersecting the optical axis OA, the lock ring 20 that moves between a locked position that restricts movement of the movable frame 60 and an unlocked position that releases the restriction, and a detector that detects the amount of movement of the lock ring 20. In this embodiment, the detector is realized by the comb-tooth portion 27 formed on a part of the lock ring 20, the photointerrupter 57 that includes a light-emitting portion 57a ​​and a light-receiving portion 57b, and the control unit 112. Since the accurate amount of movement of the lock ring 20 can be determined, it is possible to control the drive of the motor 70 based on the amount of movement of the lock ring 20. This makes it possible, for example, to reduce the rotational speed of the motor 70 before the lock ring 20 comes into contact with the elastic member 54, thereby reducing the collision noise between the lock ring 20 and the elastic member 54, and to reliably move the lock ring 20 to the locked position or unlocked position. Furthermore, if the motor 70 is a stepping motor, it becomes possible to detect loss of synchronization of the stepping motor. Furthermore, more precise control is possible compared to when the motor 70 is controlled based on the elapsed time since the lock ring 20 began to be driven.

[0055] Furthermore, in this embodiment, image stabilization device 80 includes motor 70 that drives lock ring 20, and control unit 112 that controls motor 70 based on the detected amount of movement of lock ring 20. As a result, for example, by controlling motor 70 to increase the rotational speed based on the amount of movement of lock ring 20, it is possible to shorten the time it takes for lock ring 20 to reach the locked position or unlocked position. Also, for example, by controlling motor 70 to decrease the rotational speed based on the amount of movement of lock ring 20, it is possible to reduce the collision noise between lock ring 20 and elastic member 54.

[0056] Furthermore, in this embodiment, the lock ring 20 has a first contact portion 25 that contacts the retaining frame 30 in the locked position and a second contact portion 26 that contacts the retaining frame 30 in the unlocked position, and the control unit 112 reduces the movement speed of the lock ring 20 before the retaining frame 30 comes into contact with the first contact portion 25 or the second contact portion 26 based on the detected movement amount of the lock ring 20. This makes it possible to reduce the collision noise between the lock ring 20 and the elastic member 54.

[0057] Furthermore, in this embodiment, the control unit 112 stops driving the motor 70 after the retaining frame 30 comes into contact with the first contact portion 25 or the second contact portion 26, based on the detected amount of movement of the lock ring 20. This allows the lock ring 20 to be reliably stopped at the locked position or the unlocked position, improving the reliability of the movement control of the lock ring 20.

[0058] Furthermore, when control unit 112 starts moving lock ring 20, it moves lock ring 20 at a first speed until a predetermined time Ta has elapsed, and after the predetermined time Ta has elapsed, it moves lock ring 20 at a second speed that is faster than the first speed. This makes it possible to reduce collision noise caused by backlash between pinion gear 71 attached to the rotating shaft of motor 70 and gear portion 22.

[0059] In this embodiment, the control unit 112 controls the motor 70 based on the number of edges of a digital signal based on a signal indicating the detection state of light from the light emitter 57a at the light receiver 57b, thereby enabling accurate detection of the amount of movement of the lock ring 20.

[0060] Furthermore, in this embodiment, the amount of movement of the lock ring 20 is detected without contacting the lock ring 20. This does not interfere with the movement of the lock ring 20, and therefore it is possible to prevent an unnecessary load from being applied to the motor 70.

[0061] Furthermore, in this embodiment, the image stabilizer 80 is provided with a restricting member 58 that restricts movement of the lock ring 20 when the lock ring 20 is in the locked position. This prevents the lock ring 20 from moving from the locked position due to vibrations or impacts when the lock ring 20 is in the locked position, improving the reliability of the lock ring 20 restricting the movement of the movable frame 60.

[0062] In the above embodiment, the amount of movement of the lock ring 20 is detected using the comb-tooth portion 27 formed on a part of the lock ring 20 and the photointerrupter 57, but this is not limited to this. For example, a scale with a repeating reflective pattern may be provided on the lock ring 20, and a reflective photosensor may be provided on the fixed frame 50 to detect the amount of movement of the lock ring 20. Alternatively, a scale with a reflective pattern may be provided on the fixed frame 50, and a reflective photosensor may be provided on the lock ring 20. Alternatively, the photointerrupter 57 may be provided on the lock ring 20, and the comb-tooth portion 27 may be provided on the fixed frame 50.

[0063] Furthermore, in the above embodiment, the rotation speed of the motor 70 is controlled based on the amount of movement of the lock ring 20, but for example, the movement speed (rotation speed) of the lock ring 20 may be calculated from the amount of movement of the lock ring 20, and the motor 70 may be controlled based on the movement speed of the lock ring 20. For example, when the movement speed of the lock ring 20 becomes equal to or greater than a threshold, the amount of current supplied to the motor 70 may be reduced or the duty ratio may be reduced to reduce the impact sound between the lock ring 20 and the elastic member 54. restraint It may be possible to do so.

[0064] In the above embodiment, a lens-moving type image stabilizer 80 that drives lens group L6 has been described, but the present invention is not limited to this and can also be applied to an image sensor-moving type image stabilizer that drives an image sensor. For example, a holding member that movably holds the image sensor may be provided with either a detecting portion or a detected portion, and a locking member that can lock the image sensor relative to the holding member may be provided with the other detecting portion or the detected portion, so that the amount of movement of the locking member relative to the holding member can be detected. Furthermore, in the above embodiment, the lock ring 20 has been described as an example, but the present invention is not limited to this and can also be applied to a configuration in which the lens group L6 is locked by moving a lock member in the optical axis direction.

[0065] Furthermore, the image stabilization device described in the above embodiment is not limited to compact digital cameras and single-lens reflex digital cameras, but can also be applied to optical devices such as video cameras, binoculars, microscopes, telescopes, and mobile phones.

[0066] The above-described embodiment is a preferred example of implementation, but is not limited to this, and various modifications are possible within the scope of the gist, and any constituent elements may be combined. [Explanation of symbols]

[0067] 20 Lock ring 25 1st contact part 26 Second contact part 27 Comb teeth 30 Retaining frame 57a Light-emitting part 57b Light receiving section 58 Regulatory member 60 Movable frame 70 Motor 80 Image Stabilizer 90X, 90Y VCM 112 Control section L6 lens group

Claims

1. a lens holding frame for holding a lens; a holding frame that movably holds the lens holding frame; a first drive unit that drives the lens holding frame relative to the holding frame in a direction intersecting the optical axis; a locking member that moves between a locking position that restricts movement of the lens holding frame and a release position that releases the restriction; a detection unit that detects the amount of movement of the locking member; Equipped with the locking member engages with a restricting member when the locking member is in the locked position, and the restricting member biases the locking member in a direction opposite to a direction from the locked position to the released position, the first driving unit includes a magnet, a coil, and a yoke; the yoke is not disposed between the holding frame and the locking member in the optical axis direction, the holding frame has a protrusion that protrudes toward the locking member in the optical axis direction, and the protrusion comes into contact with the locking member in at least one of the locked position and the released position; Image stabilization device.

2. a second drive unit that drives the lock member; a control unit that controls the second drive unit based on the amount of movement of the lock member detected by the detection unit; The image stabilization device according to claim 1 , comprising:

3. the locking member has a contact portion that comes into contact with the protrusion in at least one of the release position and the lock position; The image stabilization device according to claim 2 .

4. the locking member has a contact portion that comes into contact with the protrusion in at least one of the release position and the lock position, the detection unit has a light emitting unit and a light receiving unit, the light emitting unit is provided on a part of the holding frame, The light receiving unit is provided on a part of the locking member. The image stabilization device according to claim 2 .

5. The protrusion has an elastic member. The image stabilization device according to any one of claims 1 to 4.

6. The protrusion has an elastic member, the detection unit has a light emitting unit and a light receiving unit, the light emitting unit is provided on a part of the holding frame, The light receiving unit is provided on a part of the locking member. The image stabilization device according to any one of claims 1 to 3.

7. the contact portion has a first contact portion that contacts the protrusion at the release position and a second contact portion that contacts the protrusion at the lock position, the control unit reduces the movement speed of the locking member before the protrusion comes into contact with the first contact portion or the second contact portion, based on the movement amount of the locking member detected by the detection unit.

5. The image stabilization device according to claim 3.

8. the contact portion includes a first contact portion that contacts the protrusion at the release position and a second contact portion that contacts the protrusion at the lock position; The first contact portion and the second contact portion are arranged on the same circumference with the optical axis as the center.

5. The image stabilization device according to claim 3.

9. the locking member has a gear portion to which a driving force from the second driving portion is transmitted, the contact portion includes a first contact portion that contacts the protrusion at the release position and a second contact portion that contacts the protrusion at the lock position; the first contact portion, the second contact portion, and the gear portion are arranged on the same circumference with the optical axis as the center, the gear portion, the second contact portion, and the first contact portion are arranged in this order along the circumferential direction of a circle centered on the optical axis, 5. The image stabilization device according to claim 3.

10. the locking member has a protrusion that restricts movement of the lens holding frame, The protrusion is formed to protrude along the optical axis. The image stabilization device according to any one of claims 1 to 4.

11. the locking member has a protrusion that restricts movement of the lens holding frame, the locking member, the holding frame, and the lens holding frame are arranged in this order along the optical axis, When the locking member is in the locked position, the protrusion penetrates through an opening formed in the holding frame and comes into contact with the lens holding frame. The image stabilization device according to any one of claims 1 to 4.

12. the control unit stops driving the second drive unit after the protrusion comes into contact with the first contact portion or the second contact portion, based on the amount of movement of the locking member detected by the detection unit. The image stabilization device according to claim 7.

13. When the control unit starts moving the locking member, the control unit moves the locking member at a first speed until a predetermined time has elapsed, and when the predetermined time has elapsed, the control unit moves the locking member at a second speed that is faster than the first speed. The image stabilization device according to any one of claims 2 to 4.

14. the detection portion includes a comb-tooth portion formed on a part of the locking member, The light-emitting portion and the light-receiving portion face each other with the comb-tooth portion therebetween. The image stabilization device according to claim 4.

15. the control unit controls the second drive unit based on the number of edges of a digital signal based on a signal indicating a detection state of the light from the light emitter in the light receiver. The image stabilization device according to claim 4.

16. The detection unit detects the amount of movement of the locking member without contacting the locking member. The image stabilization device according to any one of claims 1 to 4.

17. A lens barrel comprising the image stabilization device according to any one of claims 1 to 4.

18. An imaging device comprising the image stabilization device according to any one of claims 1 to 4.

Images