JP6645694B2 - Driving device, image blur correction device, lens barrel, and imaging device - Google Patents

Description

The present invention, drive kinematic device you drive moving the driven object, image blur correction apparatus comprising a drive moving device, a lens barrel and an image pickup device.

  Driving a holding member holding a lens or an image sensor in an arbitrary direction in a plane orthogonal to an imaging optical axis as an image blur correction mechanism for correcting image blur caused by hand shake or the like at the time of imaging by an imaging device such as a digital camera. What is known is. Further, as such an image blur correction mechanism, a mechanism including a guide mechanism for preventing rotation of the holding member and a holding mechanism for restricting movement of the holding member when not in use is known (see Patent Document 1). In Patent Literature 1, a guide mechanism that regulates rotation of a holding member that holds a lens is disposed between the drive unit and the lens unit so as to surround the lens unit by about a half circumference.

JP 2013-47787 A

  However, according to the technology described in Patent Document 1, it is necessary to provide a space for disposing the guide mechanism separately from a space for disposing the drive unit, so that the entire image blur correction device becomes large. There's a problem.

The present invention aims to smaller and thinner to provide a drive kinematic device possible.

Engaging Ru drive kinematic device of the present invention, each, a vibration type actuator, and an output unit for outputting thrust, and a plurality of drive units having a holding portion that holds a plurality of drive units, the output unit A moving body driven by the plurality of drive units, and the moving body is translated and rotated in an arbitrary direction in a plane. An annular fixing portion that supports the movable member, and a rotation restricting unit that restricts rotation of the moving body in the plane , wherein the fixing portion has a plurality of long holes whose circumferential direction is a longitudinal direction. The moving body has a plurality of support members that protrude in a radial direction from an outer periphery of the moving body and are inserted into each of the plurality of long holes, and the plurality of support members are in a radial direction of the moving body. Symmetric about the center of the moving body Provided that the position, the thrust receiving portion is provided on a straight line connecting the plurality of supporting members, said rotation restricting means, when viewed from the thrust direction of the moving body, the center axis of the fixed part It is characterized in that it is arranged outside the first circle having the largest diameter that does not include the plurality of drive units as a center.

According to the present invention enables the miniaturization and thinning of the drive braking system.

1 is an exploded perspective view illustrating a schematic configuration of a translation drive device according to a first embodiment of the present invention. It is a top view of the translation drive shown in FIG. FIG. 2 is a perspective view illustrating a schematic configuration of a vibrating body constituting a drive unit included in the translation driving device illustrated in FIG. 1, and a schematic diagram illustrating first and second vibration modes excited by the vibrating body. FIG. 2 is an exploded perspective view illustrating a schematic configuration of a rotation restricting unit provided in the translation driving device illustrated in FIG. 1. FIG. 2 is a diagram illustrating a relationship between a magnitude and a direction of a thrust by which an output unit of a driving unit included in the translation driving device illustrated in FIG. 1 translates a moving body and a driving direction of the moving body. FIG. 2 is a plan view showing a state in which translation of a moving body is restricted in the translation driving device shown in FIG. 1. FIG. 2 is a plan view showing a positional relationship among a drive unit, a rotation restricting unit, and a support roller in the translation drive device shown in FIG. 1. It is a top view showing the schematic structure of the translation drive concerning a 2nd embodiment of the present invention. It is a top view showing the schematic structure of the translation drive concerning a 3rd embodiment of the present invention. FIG. 10 is a cross-sectional view illustrating a schematic configuration of a driving unit included in the translation driving device illustrated in FIG. 9. FIG. 10 is a schematic diagram illustrating a positional relationship between a fixed unit and a holding unit and an operation of a ball plunger in the translation driving device illustrated in FIG. 9. FIG. 2 is a top view illustrating a schematic configuration of an imaging device including the translation driving device illustrated in FIG. 1.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<First embodiment>
FIG. 1 is an exploded perspective view showing a schematic configuration of a translation driving device 100 according to the first embodiment of the present invention. FIG. 2 is a top view of the translation drive device 100. For convenience of explanation, a three-dimensional orthogonal coordinate system (X axis, Y axis, Z axis) shown in FIGS. 1 and 2 is defined. Here, the thrust direction (thickness direction) of the translation driving device 100 is defined as a Z direction, and a plane orthogonal to the Z direction is defined by an X direction and a Y direction orthogonal to each other.

  The translation driving device 100 includes a fixed unit 1, a holding unit 2, a moving body 3, driving units 4A and 4B, and a rotation restricting unit 20.

  On the outer peripheral portion of the flat and substantially annular moving body 3, four supporting rollers 5 which are cylindrical supporting members protruding in the radial direction (radial direction) are provided at equal intervals in the circumferential direction. A roller receiving portion 8, which is a long hole having a circumferential direction as a longitudinal direction, is provided on the annular fixing portion 1 at equal intervals in the circumferential direction so as to engage with each of the four support rollers 5. It is formed in several places. The moving body 3 is supported by the fixed unit 1 while being movable with respect to the fixed unit 1 by inserting the respective supporting rollers 5 into the respective roller receiving units 8.

  Here, the support roller 5 can smoothly slide with respect to the inner peripheral surface on the long side of the roller receiving portion 8. Therefore, the position of the moving body 3 in the Z direction is regulated by the fixed portion 1. In addition, translation is possible within a certain range in the XY plane.

  The rotation restricting section 20 is fixed to the fixing section 1 and restricts rotation of the moving body 3. Details of the configuration and function of the rotation restricting unit 20 will be described later. In the fixed part 1, two first displacement sensors 6a and 6b are arranged so that the length measurement directions are different by 90 degrees (π / 2 radians). Further, a second displacement sensor 7 is arranged (fixed) on the holding unit 2. The functions and the like of the first displacement sensors 6a and 6b and the second displacement sensor 7 will be described later.

  The plate-shaped and annular holding portion 2 uses the axis parallel to the Z direction through the center of the holding portion 2 as a rotation axis so as to close one opening (XY plane) of the fixing portion 1. It is arranged so as to be rotatable with respect to. Therefore, the holding unit 2 and the moving body 3 are arranged in parallel. In the present embodiment, the holding portion 2 having a hole at the center is taken up. However, depending on the use of the translation driving device 100, a disk-shaped support having no hole may be used. Can be.

  The holding unit 2 holds (fixes) two drive units 4A and two drive units 4B. The drive unit 4A and the drive unit 4B are unitized by assembling various element parts constituting the vibration type actuator, and have the same structure.

  Specifically, the drive unit 4A includes, as main components, a vibrating body 110 (see FIG. 3) and a driven body 10A that is frictionally driven by the vibrating body 110. The drive unit 4A includes a frame member that holds the vibrating body 110 and a pressing member that presses the driven body 10A against the vibrating body 110. Note that the vibrating body 110 and the driven body 10A are minimum elements for constituting a vibration type actuator. The driving unit 4B also includes, as main components, a vibrating body 110, a frame member that holds the vibrating body 110, a driven body 10B that is frictionally driven by the vibrating body 110, and a driven body 10B that is driven by the vibrating body 110. And a pressure member to be brought into pressure contact with the pressure member.

  FIG. 3A is a perspective view illustrating a schematic configuration of the vibrating body 110 configuring the drive units 4A and 4B. FIG. 3B is a schematic diagram illustrating a first vibration mode excited by the vibrating body 110, and FIG. 3C is a schematic diagram illustrating a second vibration mode excited by the vibrating body 110. FIG.

  The vibrating body 110 includes a plate-shaped elastic body 111, two protrusions 112 provided on one surface of the elastic body 111, and a surface opposite to the surface of the elastic body 111 on which the protrusion 112 is provided. And a piezoelectric element 113 which is an electro-mechanical energy conversion element bonded thereto. As shown in FIG. 3A, a direction connecting the two protrusions 112 is defined as an α direction, a protrusion direction of the protrusions 112 is defined as a γ direction, and a direction orthogonal to the α direction and the γ direction is defined as a β direction.

  Although not shown, one surface of the piezoelectric element 113 is provided with two independent electrodes in the α direction, and the other surface is provided with a common electrode over the entire surface. By applying a predetermined AC drive voltage to the two independent electrodes, the vibration in the first vibration mode and the vibration in the second vibration mode can be excited in the vibrating body 110 with a predetermined phase difference.

  The first vibration mode shown in FIG. 3B is a primary bending vibration in the β direction, and has two nodes parallel to the α direction. In the description of the present embodiment, “parallel” means that it can be regarded as substantially parallel, does not require strict parallelism, and has the same definition in the following description. Is also used.

  The protrusion 112 is arranged near a position that becomes an antinode in the vibration of the first vibration mode, and reciprocates in the γ direction by the vibration of the first vibration mode. On the other hand, the second vibration mode shown in FIG. 3B is secondary bending vibration in the α direction, and has three nodes parallel to the β direction. The protrusion 112 is arranged near a position serving as a node in the vibration in the second vibration mode, and reciprocates in the α direction by the vibration in the second vibration mode.

  The nodes in the first vibration mode and the nodes in the second vibration mode are orthogonal to each other in the αβ plane. By causing the vibrating body 110 to generate each of the A-mode and B-mode vibrations with a predetermined phase difference, an elliptical motion or a circular motion (hereinafter referred to as “elliptical motion or the like”) can be generated at the tip of the protrusion 112. In the description of the present embodiment, "orthogonal" means that it can be regarded as substantially orthogonal, and does not require that they are strictly orthogonal. Also used for explanation.

  Each of the driven members 10A and 10B (not shown in FIG. 3) is in pressure contact with the protrusion 112 with the γ direction as a pressure direction. In the drive units 4A and 4B, the vibrating body 110 is fixed. Therefore, when the projections 112 are excited by elliptical motion or the like, the driven bodies 10A and 10B are driven by the projections 112 to be driven linearly in the α direction. As described above, the drive units 4A and 4B are each configured as a linear drive type vibration type actuator that generates a drive force for linearly driving the driven bodies 10A and 10B in the α direction.

  The two driving units 4A are arranged so that the driving directions of the driven body 10A are parallel, and the two driving units 4B are arranged such that the driving directions of the driven body 10B are parallel. The driving unit 4A and the driving unit 4B are arranged on the holding unit 2 so that the driving direction of the driven body 10A and the driving direction of the driven body 10B are orthogonal to each other in the XY plane.

  As shown in FIG. 2, the output unit 10A1 is provided on the upper surface of the driven body 10A of the drive unit 4A, and the output unit 10B1 is provided on the upper surface of the driven body 10B of the drive unit 4B. The output portion 10A1 of the drive unit 4A is slidably engaged with a long-hole-shaped thrust receiving portion 11A provided on the moving body 3 such that the longitudinal direction is the radial direction. The output portion 10A1 has substantially no play with respect to the thrust receiving portion 11A in the driving direction of the driven body 10A (the short direction of the thrust receiving portion 11A), and the thrust receiving portion moves inside the thrust receiving portion 11A. It is engaged with the thrust receiving portion 11A with dimensional accuracy that allows it to move in the longitudinal direction of 11A. Similarly, the output portion 10B1 of the drive unit 4B is slidably engaged with a long-hole-shaped thrust receiving portion 11B provided on the moving body 3 such that the longitudinal direction is the radial direction. The output portion 10B1 has substantially no play in the driving direction of the driven body 10B (the short direction of the thrust receiving portion 11B) and the thrust receiving portion 11B in the thrust receiving portion 11B. It is engaged with the thrust receiving portion 11B with dimensional accuracy that allows it to move in the longitudinal direction of 11B.

  Therefore, when the driving unit 4A is driven, the output unit 10A1 applies a thrust to the moving body 3 so that the moving body 3 can be linearly translated in the driving direction of the driven body 10A. Moves smoothly in the longitudinal direction in the thrust receiving portion 11B. Similarly, when the driving unit 4B is driven, the output unit 10B1 applies a thrust to the moving body 3 so that the moving body 3 can be linearly translated in the driving direction of the driven body 10B. 10A1 smoothly moves in the thrust receiving portion 11A in the longitudinal direction.

  The first displacement sensor 6a detects the amount of movement of the moving body 3 in the Y direction, the first displacement sensor 6b detects the amount of movement of the moving body 3 in the X direction, and the second displacement sensor 7 Detects the relative movement amount of the moving body 3 and the holding unit 2 in the Y direction. A control device (drive circuit) (not shown) that drives the translation drive device 100 includes information (output) from the first displacement sensors 6a and 6b and the second displacement sensor 7 and driving force vectors of the drive units 4A and 4B. The translation and the rotation of the moving body 3 are controlled based on the deviation from the moving amount obtained by combining the above.

  It is desirable that the length measuring direction of the first displacement sensor 6a and the length measuring direction of the second displacement sensor 7 coincide, and in the present embodiment, they are the same Y direction (+ Y direction, -Y direction). In the translation drive device 100, when the drive units 4A and 4B are driven to rotate the holding unit 2 with respect to the fixed unit 1, the Y direction detected by the first displacement sensor 6a and the second displacement sensor 7 respectively. There is a difference in the amount of movement. Therefore, by calculating the difference using a trigonometric function or the like, the rotation angle of the holding unit 2 can be calculated.

  If there is slight backlash in the rotation restricting section 20, the first displacement sensor 6a and the second displacement sensor 6a are not driven even though the drive units 4A and 4B are not driven to rotate the holding section 2. There may be a difference in the amount of movement in the Y direction detected by each of the displacement sensors 7. Even in this case, by performing control to correct the rotation of the moving body 3, the moving body 3 can be translated in a desired direction.

  FIG. 4 is an exploded perspective view illustrating a schematic configuration of the rotation restricting unit 20. The rotation restricting section 20 has a base 26 (first member) and a slide member 25 (second member). The base 26 is fixed to the fixing unit 1. The base 26 has a slot-shaped sliding groove 21b extending in a direction (first direction) parallel to the driving direction of the driven body 10B of the driving unit 4B while being fixed to the fixing unit 1. Is provided. Further, ball receiving portions 27A are provided at three locations on the surface of the base 26 on the side of the slide member 25, and balls (not shown) are arranged in each of the three ball receiving portions 27A.

  On the upper surface of the slide member 25 (surface opposite to the surface on the base 26 side), a direction parallel to the moving direction of the driven body 10A of the drive unit 4A in a state where the base 26 is fixed to the fixing portion 1. Are provided with two ball bearings 22 arranged side by side. A ball receiving portion 27B is provided at one position on the upper surface of the slide member 25, and a ball (not shown) is arranged in the ball receiving portion 27B. The lower surface (the surface on the base 26 side) of the slide member 25 has the same structure as the two ball bearings 22 and is slidably engaged with the elongated slide groove 21 a provided in the moving body 3. Two unillustrated ball bearings are provided. The sliding groove 21a is formed on the moving body 3 so that its length direction is parallel to the driving direction (second direction) of the driven body 10A of the driving unit 4A.

  With the rotation restricting portion 20 attached to the fixed portion 1, the two ball bearings 22 provided on the upper surface of the slide member 25 are slidable with the elongated sliding groove portion 21 a provided on the moving body 3. Engages. Therefore, the moving body 3 is movable with respect to the slide member 25. Further, two ball bearings (not shown) provided on the lower surface of the slide member 25 are engaged with the slide grooves 21b provided on the base 26, and the shape of the slide grooves 21b allows the driven body 10A to be driven. The movement of the slide member 25 in the driving direction is restricted. Therefore, when the driving unit 4A is driven, the two ball bearings 22 roll in the sliding groove 21a, and the moving body 3 translates in a direction parallel to the driving direction of the driven body 10A.

  Movement of the driven body 10B in the driving direction with respect to the slide member 25 of the moving body 3 is restricted by the shape of the sliding groove portion 21a. On the other hand, when the drive unit 4B is driven, two ball bearings (not shown) provided on the lower surface of the slide member 25 roll in the slide grooves 21b provided on the base 26, and the slide member 25 To move against. Therefore, the moving body 3 translates in the driving direction of the driven body 10B integrally with the slide member 25.

  When the moving body 3 is translated, one ball is arranged between the moving body 3 and the slide member 25, and three balls are arranged between the slide member 25 and the base 26. 3. The positional relationship between the slide member 25 and the base 26 is appropriately maintained. Thereby, the clearance between the two ball bearings 22 and the sliding groove 21a and the clearance between the two ball bearings (not shown) and the sliding groove 21b are reduced, thereby suppressing the occurrence of rattling and sliding. Dynamic load can be reduced. In the present embodiment, the ball bearing 22 and the ball are used. Alternatively, a configuration using a bar or a sliding bearing made of a material having a small friction coefficient such as PTFE may be used.

  Since the rotation restricting section 20 only needs to be able to restrict the rotation of the moving body 3 in the XY plane, the moving direction of the slide member 25 is necessarily parallel to the driving direction of the driven body 10B, and the movement of the base 26 is not limited. The direction does not need to be substantially parallel to the driving direction of the driven body 10A. However, the magnitude of the driving force required to be generated in the driving units 4A and 4B, that is, the magnitude of the thrust by which the output units 10A1 and 10B1 translate the moving body 3 may vary depending on the driving direction of the moving body 3. . In this case, it is desirable that the rotation restricting section 20 be installed so that the sliding load of the rotation restricting section 20 is reduced in a driving direction requiring a large drive.

  As an example, a case where the translation driving device 100 is installed so that the translation surface of the moving body 3 is parallel to the direction of gravity is taken up. The relationship between the size and the driving direction of the moving body 3 will be described. For example, a lens or an image sensor is attached to a hole formed at the center of the moving body 3 to form an image blur correction device, and when the image blur correction device is applied to the image capture device, a general image capturing posture is obtained. The translation surface of the moving body 3 is parallel to the direction of gravity.

FIG. 5 is a diagram illustrating the relationship between the magnitude and direction of the thrust for the output units 10A1 and 10B1 of the drive units 4A and 4B to translate the moving body 3 and the driving direction of the moving body 3. The thrusts for the two output units 10A1 to translate the moving body 3 are F ₁ and F ₃ , respectively, and the thrusts for the two output units 10B1 to translate the moving body 3 are F ₂ and F ₄ , respectively. Orientation. The inclinations of the thrusts F ₁ , F ₂ , F ₃ , and F _{4 in} the X direction are θ ₁ , θ ₂ , θ ₃ , and θ ₄ , respectively, and the weight of the moving body 3 is M. It should be noted that the magnitude of the thrust by which the output units 10A1 and 10B1 translate the moving body 3 can be considered to be equivalent to the magnitude of the driving force generated by the driving units 4A and 4B.

At this time, in order to drive the movable body 3 + Y direction, it is necessary to thrust F _Y satisfy the relation of the following formula 1. Note that “g” in Equation 1 below is the gravitational acceleration.

On the other hand, the thrust _{F Y,} using the thrust _F 1 to F _4, represented by the following formula 2. Since it can be regarded as substantially thrust _F 1 to F _{4 equal,} a _{-F 1 = F 2 = F 3} = -F 4 = F a. In the translation driving device 100, since θ ₁ = θ ₂ = θ ₃ = θ ₄ = 45 °, the following Expression 2 is rewritten into the following Expression 3. Thus, the following equation 4 is derived from the following equations 1 and 3.

Next, determine the thrust F _S when driving the movable body 3 in a direction that coincides with the generating direction of the thrust force F _2. In this case, since the load in the X direction not applied, the thrust F _S acts as a force for moving the movable body 3 in the Y direction. Therefore, the relationship of the following Expression 5 is established. Moreover, it is not necessary to drive the driving unit 4A, it holds the following formula _6, when _{F 2 = -F 4 = F b} , the following equation 7 is obtained. Therefore, the following Expression 8 is obtained from Expression 5 and Expression 7 below.

From the above expressions 3, 4, 7, and 8, when the thrusts F _Y and F _S are equal, the relationship of F _b / F _a = 2 ^1/2 is obtained. This means that when the driving direction of thrust F ₂ direction as the moving body 3 substantially coincides, shows that greater thrust is required. This also applies to the relationship between the driving direction of the direction of the movable body 3 of the thrust F _3.

  Therefore, in the present embodiment, the moving direction of the slide member 25 is set so that the sliding load of the rotation restricting section 20 is reduced when it is necessary to generate a large driving force in the driving unit 4B. The rotation restricting portion 20 is provided so as to be parallel to the direction. Similarly, when the driving unit 4A needs to generate a large driving force, the moving direction of the base 26 is parallel to the moving direction of the output unit 10A1 so that the sliding load of the rotation restricting unit 20 is reduced. The rotation restricting part 20 is installed so as to be as follows. As described above, by configuring at least one or both of the slide member 25 and the base 26 to be movable in a direction parallel to the driving direction of the driven body 10A and / or the driven body 10B, a corresponding driving unit is provided. The driving force to be generated can be minimized.

  Next, a mechanism for holding the moving body 3 at a predetermined position will be described. The translation driving device 100 has a structure capable of holding the moving body 3 at a predetermined position and regulating the translation of the moving body 3. FIG. 6 is a plan view showing a state where the translation of the moving body 3 is restricted in the translation driving device 100. The holding portion 2 is provided with engagement pins 18 at three locations, and the moving body 3 is provided with engagement portions 19 at three locations. FIG. 2 shows a state in which the three engaging pins 18 are not engaged with the engaging portions 19 at the three positions, and the moving body 3 can translate in the XY plane.

  Since the moving body 3 cannot be rotated by the rotation restricting section 20, when a driving force for driving the moving body 3 in the counterclockwise direction is generated in the drive units 4A and 4B in the state of FIG. The units 4A and 4B try to move clockwise with respect to the moving body 3. Along with this, the holding portion 2 holding the drive units 4A and 4B rotates clockwise, and when the holding portion 2 rotates to the position shown in FIG. 6, the engaging pin 18 and the engaging portion 19 are engaged. Then, the rotation of the holding unit 2 stops. The engagement of the engagement pin 18 with the engagement portion 19 restricts the translation of the moving body 3. At this time, based on the displacements detected by the first displacement sensor 6a and the second displacement sensor 7, respectively, the rotation angle of the holding unit 2 is measured, and the measured rotation angle is used as a control parameter to control the translation drive device 100. To memorize it.

  To release the translation restriction of the moving body 3, the driving units 4A and 4B rotate the holding unit 2 counterclockwise by the same rotation angle as the rotation angle of the holding unit 2 stored as a control parameter. Should be driven. By setting the translation of the moving body 3 in a state where the translation of the moving body 3 is not performed when the translation driving device 100 is not used, for example, it is possible to suppress damage or the like when an external force acts on the moving body 3. In the present embodiment, a combination of the engaging pin 18 and the engaging portion 19 is used as a means for restricting the translation of the moving body 3. However, the engaging means is not limited to this. Means may be used.

  The positional relationship between the drive units 4A and 4B, the rotation restricting unit 20, and the support rollers 5 in the translation drive device 100 will be described with reference to FIG. FIG. 7 is a plan view showing the positional relationship among the drive units 4A and 4B, the rotation restricting unit 20, and the support rollers 5 in the translation drive device 100.

  The first circle 12 in FIG. 7 is a circle whose radius is the shortest distance from the center of the holding section 2 (fixed section 1) to the drive units 4A and 4B, and has a maximum diameter not including the drive units 4A and 4B. It is a circle. The second circle 13 in FIG. 7 is a circle whose radius is the distance from the center of the holding section 2 (fixing section 1) to the farthest point (part) of the drive units 4A and 4B. This is a circle having the minimum diameter including the units 4A and 4B. The first circle 12 and the second circle 13 are concentric circles having a common center.

  The drive units 4A and 4B are arranged outside the first circle 12 and inside the annular area 14 inside the second circle 13 when viewed from the Z direction which is the axial direction of the rotation axis. ing. The first displacement sensors 6a and 6b and the second displacement sensor 7 are disposed outside the first circle 12 at a position that does not overlap with the drive units 4A and 4B when viewed from the Z direction. Are arranged in a region outside the second circle 13. A part of the rotation restricting portion 20 is arranged outside the first circle 12 and inside the second circle 13. With such a configuration, the inside of the first circle 12 in the holding unit 2 can be a space (center hole).

  Since the center hole is formed in the holding unit 2, the translation driving device 100 is used as an image blur correction device in which an image blur correction lens is disposed in the center hole of the moving body 3 and is disposed in the lens barrel. be able to. Further, the translation driving device 100 can also be used as an image blur correction device in which an image sensor is arranged in the center hole of the moving body 3 and the wiring of the image sensor is passed through the center hole of the holding unit 2. Further, when the translation driving device 100 is applied to an XY table, signal lines and the like for driving the driving units 4A and 4B can be wired through the center hole of the holding unit 2.

  As described above, in the translation driving device 100, the first displacement sensors 6a and 6b, the second displacement sensor 7, and the rotation restricting unit 20 can be arranged in the area where the drive units 4A and 4B are arranged. Therefore, miniaturization becomes easy. Further, in the translation driving device 100, since the distance between the holding unit 2 and the moving body 3 does not increase due to the arrangement of the rotation restricting unit 20, the thickness can be reduced in the Z direction.

<Second embodiment>
FIG. 8 is a top view showing a schematic configuration of a translation driving device 100A according to the second embodiment of the present invention. The translation drive device 100A has a configuration in which the translation drive device 100 according to the first embodiment is provided with two drive units 4A and 4B each of which is provided two by two, and there is no change in other configurations. Therefore, the translation driving device 100A has the same effect as the translation driving device 100A, and the cost can be reduced by reducing the number of the driving units 4A and 4B.

<Third embodiment>
FIG. 9 is a top view illustrating a schematic configuration of a translation driving device 100B according to a third embodiment of the present invention. In the translation drive device 100 according to the first embodiment, the translation drive of the moving body 3 is realized using the drive units 4A and 4B having the vibration type actuator. On the other hand, the translation drive device 100B uses the drive units 34A and 34B having motors constituted by drive coils and permanent magnets instead of the drive units 4A and 4B having vibration type actuators, and Drive translation.

  The translation drive device 100B includes a fixed portion 31, a holding portion 32, a moving body 33, drive units 34A and 34B, first displacement sensors 6a and 6b, a second displacement sensor 7, and a rotation restricting portion 20. The first displacement sensors 6a and 6b, the second displacement sensor 7, and the rotation restricting unit 20 are the same as those constituting the translation driving device 100, and thus the description thereof will be omitted.

  The fixed part 31 is different from the fixed part 1 that constitutes the translation driving device 100 according to the first embodiment in that the ball plunger 40 is fixed at a predetermined position, but other configurations are the same as the fixed part 1. . The holding unit 32 is different from the holding unit 2 of the translation driving device 100 according to the first embodiment in that the holding unit 32 includes concave portions 41 a and 41 b that engage with the ball plunger 40, but other configurations are the same. Is the same as By using the drive units 34A and 34B, the moving body 33 does not need the thrust receiving units 11A and 11B. Therefore, the moving body 33 is different from the moving body 3 constituting the translation driving device 100 according to the first embodiment in that the moving body 33 does not have the thrust receiving portions 11A and 11B, but other configurations are the same as the moving body 3. is there.

  FIG. 10 is a sectional view showing a schematic configuration of the drive units 34A and 34B. Each of the drive units 34A and 34B has the same structure, and includes a back yoke 35, a permanent magnet 36, a drive coil 37, and a yoke 38. The drive coil 37 is attached to the moving body 33 via a yoke 38, and the permanent magnet 36 is attached to the holder 32 via a back yoke 35.

  The drive units 34A and 34B are so-called voice coil motors that convert electric energy into mechanical energy using magnetic flux generated by the permanent magnet 36. An electric current flows through the drive coil 37 in the depth direction of the drawing on which FIG. 10 is drawn. When the electric current flows, the driving coil 37 generates a force that moves in the left and right direction of the drawing. The moving body 33 is moved by. In addition, it is also possible to directly drive the movable body 33 by attaching the drive coil 37 thereto.

  In the translation drive device 100B, even when the engagement pin 18 and the engagement portion 19 are engaged, when no current is applied to the drive coil 37, no force is applied to the drive coil 37. 33 cannot be held in a fixed position. Therefore, in the translation driving device 100B, using the ball plunger 40, the position of the holding portion 32 with respect to the fixed portion 31 is changed between a position where the translation of the moving body 33 is possible and a position where the translation of the moving body 33 is restricted. Switch.

  FIG. 11 is a schematic diagram illustrating the positional relationship between the fixing unit 31 and the holding unit 32 and the operation of the ball plunger 40. The ball plunger 40 has at its tip a ball 42 urged outward in the longitudinal direction by a built-in internal spring. When an external force compressing the internal spring acts on the ball 42, the ball 42 is pushed into the inside. When the external force is removed, the end is exposed.

  Recesses 41 a and 41 b for engaging the ball 42 are formed on the outer peripheral surface of the holding portion 32. FIG. 11A shows a state in which the translation of the moving body 33 is not restricted (a state in which the engaging pin 18 and the engaging portion 19 are not engaged). In this state, the ball 42 41a. As shown in FIG. 11B, when the drive units 34A and 34B are driven so as to rotate the holding portion 32 clockwise, the ball 42 rides on the outer peripheral surface between the concave portions 41a and 41b, and the ball 42 It is pushed in and slides on the outer peripheral surface of the holding portion 32.

  When the holding portion 32 is further rotated, the engagement pin 18 is engaged with the engagement portion 19, and the ball 42 is engaged with the concave portion 41b as shown in FIG. Stops, and the translation of the moving body 33 is restricted. When returning from the state where the translation of the moving body 33 is restricted to the state where translation is possible, the holding unit 32 may be rotated counterclockwise by a predetermined angle. Thus, in the translation driving device 100B, the holding portion 32 can be held at the predetermined position by the ball plunger 40 even when the driving units 34A and 34B are not driven.

  Also in the translation driving device 100B, as is clear from FIG. 9, the first displacement sensors 6a and 6b, the second displacement sensor 7, and the rotation restricting unit 20 are arranged in the area where the driving units 34A and 34B are arranged. Therefore, miniaturization becomes possible. Also, in the translation driving device 100B, the distance between the holding portion 32 and the moving body 33 is not widened by arranging the rotation restricting portion 20, so that the thickness can be reduced. That is, the translation drive device 100B also has the same effect as the translation drive device 100 according to the first embodiment.

<Fourth embodiment>
FIG. 12 is a top view illustrating a schematic configuration of an imaging device 200 including the translation driving device 100. The imaging device 200 generally includes an imaging device main body 51 having an imaging element, and a lens barrel 52 that is detachable from the imaging device main body 51. The lens barrel 52 has a plurality of lens groups 53 and a translation driving device 100 as an image blur correction device that corrects image blur of a subject.

  The light beam that has passed through the lens barrel 52 forms an image on the image sensor. The imaging device converts the formed optical image into an electric signal by photoelectric conversion and outputs the electric signal to an image processing circuit included in the imaging device 200. The image processing circuit generates image data from the received electric signal.

  The translation driving device 100 has an image blur correction lens 54 fixed to the center hole of the moving body 3, and moves the lens barrel 52 so that the Z direction shown in FIG. 1 matches the optical axis direction of the lens barrel 52. Placed in Therefore, by moving the image blur correction lens 54 in a plane orthogonal to the optical axis, it is possible to correct image blur caused by camera shake or the like and to capture a clear image.

  When the imaging device 200 is not used, it is desirable that the moving body 3 be in a state where translation is restricted (FIG. 6). Thereby, even if an external force acts on the translation drive device 100 when the imaging device 200 is carried or the like, it is possible to prevent the translation drive device 100 from being damaged. Furthermore, when the translation driving device 100A according to the second embodiment is applied to the imaging device 200, the consumption of the battery that is the driving source of the imaging device 200 due to the driving of the translation driving device 100A can be suppressed.

<Other embodiments>
As described above, the present invention has been described in detail based on the preferred embodiments. However, the present invention is not limited to these specific embodiments, and various forms that do not depart from the gist of the present invention are also included in the present invention. included. Furthermore, each of the embodiments described above is merely an embodiment of the present invention, and the embodiments can be appropriately combined. For example, the number of drive units constituting the translation drive device according to the present invention is not limited to two or four, but may be three or five or more. Further, for example, in the driving unit 4A, the driven body 10A is linearly driven relative to the vibrating body 110. The invention is not limited thereto, and the driven body 10A may be fixed and the vibrating body 110 may be linearly driven relative to the driven body 10A. In this case, the output unit 10A1 is provided on the vibrating body 110. Just do it.

1, 31 Fixed part 2, 32 Holding part 3, 33 Moving body 4A, 4B, 34A, 34B Driving unit 5 Support rollers 6a, 6b First displacement sensor 7 Second displacement sensor 10A, 10B Driven body 10A1, 10B1 Output unit 18 Engagement pin 19 Engagement unit 20 Rotation regulation unit 25 Slide member 26 Base 52 Lens barrel 100, 100A, 100B Translation drive device 200 Imaging device

Claims (18)

A plurality of drive units each having a vibration-type actuator and an output unit that outputs thrust ,
A holding unit that holds a plurality of drive units,
A moving body that is slidably engaged with the output section and receives a thrust of the output section, and is driven by the plurality of drive units;
An annular fixing portion that supports the moving body so as to translate and rotate in any direction in a plane,
Rotation control means for restricting the rotation of the moving body in the plane ,
The fixing portion has a plurality of long holes whose circumferential direction is a longitudinal direction,
The moving body has a plurality of support members protruding from an outer periphery of the moving body and inserted into each of the plurality of long holes,
The plurality of support members are provided at positions that are symmetric about a center of the moving body in a radial direction of the moving body,
The thrust receiving portion is provided on a straight line connecting the plurality of support members,
The rotation restricting means, when viewed from the thrust direction of the moving body, is disposed outside a first circle having a maximum diameter that does not include the plurality of drive units around a center axis of the fixed portion . drive braking system you characterized. A part of the rotation restricting unit has a minimum diameter outside the first circle and including the two or more drive units around the center axis when viewed from the thrust direction of the moving body . drive braking system according to claim 1, characterized in that arranged inside the region of the second circle. When viewed from the thrust direction of the moving body , a part of the rotation restricting means is provided with the two or more drive units in a region outside the first circle and inside the second circle. It is disposed in a position that does not overlap drive braking system according to claim 2, wherein. The rotation restricting means includes a first member fixed to the fixing portion, and a second member movable in a first direction with respect to the first member,
The moving body is movable in a second direction different from the first direction with respect to the second member, and is movable in the first direction integrally with the second member. drive braking system according to any one of claims 1 to 3, characterized in that. The device according to claim 4, wherein at least one of the first direction and the second direction is parallel to a driving direction in which one of the two or more driving units drives the moving body. drive motion device. The second direction is a direction orthogonal to the first direction in the plane,
At least one of the two or more drive units drives the moving body in a direction parallel to the first direction, and at least another drives the moving body in a direction parallel to the second direction. drive braking system according to claim 4 or 5, characterized in that to drive the. The drive unit includes:
An output unit for outputting the generated driving force,
A vibrating body in which the electro-mechanical energy conversion element and the elastic body are joined;
A driven body that comes into pressure contact with the vibrating body,
The moving body has a thrust receiving portion that slidably engages with the output portion and receives a thrust of the output portion,
A relative and linear movement caused between the vibrating body and the driven body by vibration excited by the vibrating body by applying a driving voltage to the electro-mechanical energy conversion element is the output unit. drive braking system according to any one of claims 1 to 6, characterized in that the moving body is translated driven by being output as thrust. 7. The motor according to claim 1, wherein the drive unit has a drive coil and a permanent magnet, and is a motor that converts electric energy into mechanical energy by using a magnetic flux generated by the permanent magnet. drive braking system according to item 1. The said holding part and the said moving body have engagement means which mutually engages when rotating the said holding part, and regulates rotation of the said holding part to a fixed angle, The Claim 7 or 8 characterized by the above-mentioned. drive motion device according to. The fixing unit and the holding unit may include switching means for switching a position of the holding unit with respect to the fixing unit between a position where the translation of the moving body is possible and a position where the translation of the moving body is restricted. drive braking system according to claim 9, characterized in. Comprising two or more sensors for measuring the amount of movement of the moving body,
11. The sensor according to claim 1, wherein one of the two or more sensors has a different direction in which the moving amount of the moving body is measured from another sensor. 12. Translation drive. The two or more sensors, driving a kinematic device according to claim 11, characterized in that it is disposed outside the first circle. The two or more sensors, when viewed from the thrust direction of the movable body, driving movement device according to claim 12, characterized in that it is arranged at a position that does not overlap with the two or more drive units . 14. The device according to claim 11, wherein at least one of the two or more sensors is arranged on the fixed part, and at least another one is arranged on the holding part. drive motion device as claimed. And drive kinematic device according to any one of claims 1 to 14,
Previous image stabilizer to said lens for a mobile image provided blur correction hear operated device, comprising: a. And drive kinematic device according to any one of claims 1 to 14,
Wherein an imaging element arranged on the movable body, the image blur correction device, comprising a pre-listen braking system.   A lens barrel comprising the image blur correction device according to claim 15.   An imaging apparatus comprising the image blur correction device according to claim 15.