JP2019109373A - Support mechanism, optical member drive device, camera device, and electronic apparatus - Google Patents

Abstract

To provide a support mechanism that has a degree of freedom in two axes, and can reduce the dimension in a direction orthogonal to the two axes, and an optical member drive device, a camera device, and an electronic apparatus.SOLUTION: A support mechanism 18 has a structure whose one side is mounted to a fixed body and the other side is mounted to a movable body, and includes a magnet pair 20 and 22 for support in which magnetic pole surfaces 32 and 34 having different magnetic poles face each other. A second slide surface 50 formed on the second magnetic pole surface 34 of the movable-body-side magnet 22 for support mounted on the movable body slides with respect to a first slide surface 48 formed on the first magnetic pole surface 32 of the fixed-body-side magnet 20 for support mounted on the fixed body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a support mechanism, an optical member drive device, a camera device, and an electronic device.

  For example, in a driving device that drives an optical member such as a lens, a support mechanism that supports the optical member in a direction perpendicular to the optical axis direction is used. As a support mechanism, as shown to patent document 1, there exist some which use a groove | channel and a ball | bowl.

Korean Published Patent No. 10-2015-0118012

  In the above-described conventional example, an X-direction linear movement mechanism including a ball and a groove movably supporting the optical member in the X direction orthogonal to the optical axis direction, and the optical member movably supporting in the Y direction orthogonal to the X direction. It has a Y-direction linear movement mechanism consisting of balls and grooves, and the X-direction linear movement mechanism and the Y-direction linear movement mechanism are stacked in the optical axis direction. Therefore, since two rectilinear mechanisms are stacked in the optical axis direction, there is a problem that the dimension in the optical axis direction becomes large.

  The present invention solves the above-mentioned conventional problems, provides a freedom degree in two axes, and can reduce a dimension in a direction orthogonal to the two axes, an optical member driving device, a camera device, and an electronic apparatus Intended to provide.

  One aspect of the present invention is a support mechanism, which has a support magnet pair in which one is mounted on a fixed body, the other is mounted on a movable body, and pole faces having different magnetic poles face each other. The second sliding surface formed on the second magnetic pole surface of the movable body side supporting magnet, which is the one mounted on the movable body of the supporting magnet pair, is the fixed one of the supporting magnet pair It is configured to slide on a first sliding surface formed on the first magnetic pole surface of the fixed body side supporting magnet, which is a person attached to the body.

  Preferably, a magnetic fluid is disposed between the first sliding surface and the second sliding surface. However, the magnetic fluid may not be present, a lubricant such as grease may be disposed instead of the magnetic fluid, and a solid lubricating portion may be provided.

  Preferably, a reservoir groove in which the magnetic fluid is accumulated is formed on at least one of the first sliding surface and the second sliding surface. More preferably, a reservoir groove in which the magnetic fluid is collected is provided in both the first sliding surface and the second sliding surface, and the reservoir groove formed in the first sliding surface, and the second It is formed in the direction which intersects with the reservoir groove formed in the sliding face. Preferably, the accumulation groove has a wall surface portion rising from the bottom surface, and the wall surface portion is formed with a slope smaller than 90 degrees with respect to the first sliding surface or the second sliding surface.

  In addition, preferably, the first sliding surface and the second sliding surface have substantially equal dimensions in a predetermined direction. Not only in the predetermined direction, but in all directions, the dimensions may be substantially equal, that is, substantially the same shape and dimension.

  Further, a sliding portion may be further provided on at least one of the first magnetic pole surface and the second magnetic pole surface, and the sliding surface may be formed on the sliding portion.

  Another aspect of the present invention is an optical member drive device, which is capable of moving a fixed body, an optical member holder for holding an optical member, and the optical member holder relative to the fixed body. A supporting mechanism for supporting the supporting magnet pair, one of which is attached to the fixed body and the other of which is attached to the optical member holder, and pole faces having different magnetic poles face each other. The second sliding surface formed on the second magnetic pole surface of the optical member-side supporting magnet, which is the one attached to the optical member holder of the supporting magnet pair, is the same as that of the supporting magnet pair. It is configured to slide with respect to a first sliding surface formed on a first magnetic pole surface of a fixed body side supporting magnet, which is mounted on the fixed body.

  Preferably, the support mechanism is disposed at four corners of the optical member holder centered on the optical axis of the optical member. More preferably, the optical member holder has a support mechanism arrangement portion cut out in a triangular shape at the corners of the four sides, and the optical member side support magnet of the support mechanism is viewed from the optical axis direction. It is formed in the triangle shape corresponding to the above-mentioned triangle shape of a support mechanism arrangement part, and is arranged at the support mechanism arrangement part.

  The optical member may be an image sensor formed in a rectangular shape, and the support mechanism may be divided into four parts so as to be circularly arranged around the center of the image sensor, and the support member supporting magnet and the optical member side And a supporting magnet. In this case, preferably, the pole faces of adjacent divided pieces of the fixed body side supporting magnet and the optical member side supporting magnet divided into four have different magnetic poles. The optical member may double as an optical member holder.

  Moreover, the other aspect of this invention is a camera apparatus which has the said optical member drive device.

  Furthermore, the other aspect of this invention is an electronic device which has the said camera apparatus.

  According to the present invention, the second sliding surface formed on the second magnetic pole surface of the movable body side supporting magnet mounted on the movable body is on the first magnetic pole surface of the stationary body side supporting magnet mounted on the stationary body. Since it is configured to slide on the formed first sliding surface, it can be supported movably in two axial directions in which the first sliding surface and the second sliding surface slide, and is orthogonal to the two axes It is possible to reduce the dimension in the direction of

FIG. 1 is a perspective view showing a camera apparatus according to a first embodiment of the present invention. It is a disassembled perspective view which shows the support mechanism used for the camera apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows a retention groove in the support mechanism which concerns on 1st Embodiment of this invention. It is an exploded perspective view showing a support mechanism concerning a 2nd embodiment of the present invention. It is an exploded perspective view showing the optical member drive concerning a 3rd embodiment of the present invention.

  Embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a camera device 10 according to a first embodiment of the present invention. The camera device 10 has a bending optical system including a prism 12 having a triangular cross section and a lens 14 having a rectangular parallelepiped shape. The lens body 14 has a lens which is an optical member and a lens holder (optical member holder) for holding the lens. The optical member drive device mounted on the camera device 10 moves the optical member relative to the fixed body, the lens body 14 including a base (not shown) which is a fixed body, the optical member and the optical member holder And a support mechanism 18 for freely supporting.
The direction in which light is incident on the prism 12 is Z, and the direction in which light is emitted from the lens body 14 is X, Z, and the direction orthogonal to X is Y.

  The light from the subject incident from the Z direction is reflected by the slopes of the prism 12 in the X direction and enters the lens body 14. The light emitted after passing through the lens body 14 forms an image on an image sensor (not shown) and is captured as a photographed image.

  In the lens body 14, a support mechanism arrangement portion 16 is provided at four corners around the X axis centered on the optical axis at the emission side. The support mechanism arrangement portion 16 is formed so as to be cut inward in a triangular shape, for example, as viewed in the optical axis direction.

  The support mechanism 18 has a support magnet pair having a fixed body side support magnet 20 and a movable body side support magnet 22, and the movable body side support magnet 22 is a support body arrangement portion 16 of the lens body 14. It is arranged in each. The movable body side supporting magnet 22 is also an optical member side supporting magnet. The support mechanism 18 is formed in a triangular shape (triangular columnar shape) when viewed from the optical axis direction. The support mechanism 18 is formed to conform to the triangular shape of the support mechanism disposition portion 16 and has a triangular fixed body side support magnet 20 and a triangular movable body side support magnet 22 similarly to the fixed body side support magnet 20 and the movable body side supporting magnet 22 are configured to overlap.

  Note that, although any magnet material can be used for the fixed body side supporting magnet 20 and the movable body side supporting magnet 22, for example, a sliding surface to be described later can be easily polished by using a ferrite magnet material.

  The fixed body side supporting magnet 20 has a light emitting side end face of the fixed body side supporting magnet 20 fixed to a base (not shown) which is a fixed body. On the other hand, in the movable body side supporting magnet 22, the incident side end face of the movable body side supporting magnet 22 is fixed to the bottom surface of the support mechanism arranging portion 16 of the lens body 14 which is a movable body.

  The movable body side supporting magnet 22 is movable relative to the fixed body side magnet 20 so as to have a degree of freedom with respect to the YZ axis, as described later.

  A rectangular parallelepiped Y-side drive magnet 24 magnetized in the + Y direction is attached to one side surface of the lens body 14 on the Y side, and the Y-side drive coil 26 is disposed at a position opposite to each other across a gap. The side drive coil 26 is attached to the base side.

  Here, when the Y-side drive coil 26 is energized, a Lorentz force for moving the Y-side drive magnet 24 in the Y direction is generated in the Y-side drive coil 26. The Lorentz force generated in the Y-side drive coil 26 acts as a reaction force on the Y-side drive magnet 24 and acts as a force to drive the lens body 14 in the Y direction.

  A Z-side drive magnet and a Z-side drive coil 28 for driving the lens body 14 in the Z direction are provided on the other side surface of the lens body 14 similarly to the Y side.

FIG. 2 shows the support mechanism 18 in detail.
In the support mechanism 18, the magnetic fluid 30 is interposed between the fixed body side supporting magnet 20 and the movable body side supporting magnet 22. Further, the fixed body side supporting magnet 20 and the movable body side supporting magnet 22 are magnetized in the same X direction, and mutually different magnetic pole faces 32 and 34 face each other. In this embodiment, the first magnetic pole surface 32 which is the N pole of the fixed body side supporting magnet 20 and the second magnetic pole surface 34 which is the S pole of the movable body side supporting magnet 22 are opposed to each other. The first magnetic pole surface 32 and the second magnetic pole surface 34 are each formed in parallel to the YZ plane. In the present embodiment, the second magnetic pole surface 34 which is the second sliding surface 50 is configured to slide relative to the first magnetic pole surface 32 which is the first sliding surface 48. Further, in this embodiment, the first magnetic pole surface 32 and the second magnetic pole surface 34 have the same shape and the same area. Then, the outer edge of the fixed body side supporting magnet 20 and the outer edge of the movable body side supporting magnet 22 are placed at the same position. The magnetic fluid 30 is attracted so as to be filled between the first pole face 32 and the second pole face 34 having the same shape and the same area. Since the magnetic fluid 30 is adsorbed between the first magnetic pole surface 32 and the second magnetic pole surface 34, the magnetic fluid 30 is unlikely to be dissipated to the outside of the support mechanism 18.

  Reservoir grooves 36 and 38 are formed on the first magnetic pole surface 32 and the second magnetic pole surface 34, respectively. Reservoir grooves 36, 38 are formed as elongated grooves, and are adapted to hold the magnetic fluid 30 in the reservoir grooves 36, 38. In FIG. 2, the magnetic fluid 30 is drawn in a transferred shape of the surface of the reservoir grooves 36 and 38. The same applies to FIGS. 4 and 5 described later.

  Further, the reservoir groove 36 of the first magnetic pole surface 32 and the reservoir groove 38 of the second magnetic pole surface 34 are formed in a direction that is not parallel to each other, that is, they intersect. In this embodiment, the reservoir groove 36 of the first magnetic pole surface 32 and the reservoir groove 38 of the second magnetic pole surface 34 are formed 90 degrees apart. If the accumulation grooves 36 and 38 are parallel, there is a possibility that the second magnetic pole surface 34 accumulates in the first magnetic pole surface 32 and drops into the grooves 36 and 38. However, the nonparallelness can prevent this drop.

  Further, as shown in FIG. 3, the accumulation grooves 36 and 38 are composed of a bottom surface portion 40 and wall surface portions 42 and 42 rising from the bottom surface portion 40. The wall portions 42 and 42 are formed to form an angle smaller than 90 degrees with respect to the first magnetic pole surface 32 or the second magnetic pole surface 34. Thus, when the movable body side supporting magnet 22 slides relative to the fixed body side supporting magnet 20 by forming the wall portions 42, 42 shallower than 90 degrees, the stagnation groove 38 of the second magnetic pole surface 34 The magnetic fluid 30 held in the fluid flows in the fluid, but can easily penetrate into the reservoir groove 36 of the opposing first magnetic pole surface 32.

  In the above embodiment, the stagnation grooves 36 and 38 are formed in both the first magnetic pole surface 32 and the second magnetic pole surface 34, but may be formed only in one of the magnetic pole surfaces. The reservoir grooves 36 and 38 may be formed by a method such as etching, or may be formed by a method that roughens the surface. Moreover, it does not restrict to providing in one direction, for example, may provide in two directions, and may provide at random. Moreover, it may not be a so-called groove shape, but may be a simple uneven shape.

  In the above configuration, as described above, when the lens body 14 is driven in the YZ direction, the movable body side supporting magnet 22 moves along with the lens body 14. That is, the movable body side supporting magnet 22 moves relative to the stationary body side supporting magnet 20 using the magnetic fluid 30 as a lubricant against the magnetic force with the stationary body side supporting magnet 20.

When the driving force on the lens body 14 is released in the moved state, the outer edge of the movable body side supporting magnet 22 is fixed body side supporting magnet by the magnetic force generated between the stationary body side supporting magnet 20 and the movable body side supporting magnet 22. Moving to coincide with the outer edge of 20, the lens body 14 returns to its original position. That is, in this case, a magnetic spring is interposed between the fixed body-side supporting magnet 20 and the movable body-side supporting magnet 22, and the respective outer edges which are the most stable positions of the second magnetic pole surface 34. Will be pulled back to the position where they agree.
Thus, the force for pulling back to the original position acts on the respective support mechanisms 18 disposed at the four corners centered on the optical axis of the optical member, so that the support mechanisms 18 as a whole are around the X axis. It is hard to rotate.

FIG. 4 shows a support mechanism 18 according to a second embodiment of the present invention.
In the second embodiment, the fixed-body-side sliding portion 44 and the movable-body-side sliding portion 46 are inserted between the fixed-body-side supporting magnet 20 and the movable-body-side supporting magnet 22. The point which arrange | positioned the magnetic fluid 30 between the movable body side sliding parts 46 differs from 1st Embodiment.

  The fixed body side sliding portion 44 and the movable body side sliding portion 46 are formed in the same triangular shape so as to have the same area as the fixed body side supporting magnet 20 and the movable body side supporting magnet 22. The fixed body side sliding portion 44 and the movable body side sliding portion 46 are made of a material capable of reducing friction, such as Teflon (registered trademark of DuPont), PTFE, silicon, aramid resin or the like.

  One surface of the stationary body side sliding portion 44 is fixed to the stationary body side supporting magnet 20, and the other side is in contact with the magnetic fluid 30 as a first sliding surface 48. Similarly, one surface of the movable-body-side sliding portion 46 is fixed to the movable-body-side supporting magnet 22, and the other surface is in contact with the magnetic fluid 30 as a second sliding surface 50.

  Reservoir grooves 36 and 38 are formed on the first sliding surface 48 and the second sliding surface 50 as in the first embodiment. Reservoir grooves 36, 38 are formed as elongated grooves, and are adapted to hold the magnetic fluid 30 in the reservoir grooves 36, 38. In addition, it may be shaped as described in the first embodiment.

  Further, the accumulation groove 36 of the first sliding surface 48 and the accumulation groove 38 of the second sliding surface 50 are formed non-parallel to prevent the fixed body side sliding portion 44 and the movable body side sliding portion 46 from falling. It has become.

  In the second embodiment, the two sliding portions of the fixed body side sliding portion 44 and the movable body side sliding portion 46 are provided. However, they may be provided on only one of them. Further, although the fixed body side sliding portion 44 and the movable body side sliding portion 46 are configured as separate members from the fixed body side supporting magnet 20 and the movable body side supporting magnet 22, for example, the fixed body side supporting magnet 20 or the movable body side It can also be provided by coating on the surface of the supporting magnet 22. In addition, although the fixed body side sliding portion 44 and the movable body side sliding portion 46 have the same shape as the fixed body side supporting magnet 20 and the movable body side supporting magnet 22, the present invention is not limited thereto. The area of the movable portion 44 or the movable-body-side sliding portion 46 may be smaller than that of the first magnetic pole surface 32 or the second magnetic pole surface 34 to further reduce friction.

  Further, in the first embodiment and the second embodiment, the fixed body side supporting magnet 20 and the movable body side supporting magnet 22 have the same triangular shape and the same size, but the present invention is not limited to this. For example, either one may be cylindrical or both may be cylindrical. Further, for example, the movable body side supporting magnet 22 may be formed in a small rectangular parallelepiped shape, and the fixed body side supporting magnet 20 may be formed in an elongated rectangular parallelepiped shape. In that case, it is desirable that the long side direction of the fixed body side supporting magnet 20 be the direction of the four sides of the lens body 14 and the dimension in the short side direction be substantially the same as the dimension of the movable body side supporting magnet 22 in the same direction. The movable body side supporting magnet 20 can be guided in the long side direction of the fixed body side supporting magnet 20 while exerting a force for returning the movable body side supporting magnet 22 to the center in the short side direction of the fixed body side supporting magnet 20.

Further, any one of the first sliding surface 48 and the second sliding surface 50 may be a surface other than a flat surface such as a spherical surface, for example. Since the contact area between the first sliding surface 48 and the second sliding surface 50 can be reduced, the coefficient of friction can be further reduced, and the lens body 14 can be moved with a smaller driving force.
Further, if the coefficient of friction between the first sliding surface 48 and the second sliding surface 50 is small, it is not necessary to use the magnetic fluid 30. Also, instead of the magnetic fluid 30, other lubrication methods such as grease or liquid lubricant may be used.

FIG. 5 shows an optical member drive device 52 according to a third embodiment of the present invention.
The optical member drive device 52 has an image sensor 54 as an optical member.

  The image sensor 54 is formed of, for example, a CCD, and also serves as an optical member holder (image sensor holder), and the support mechanism 18 is disposed on the non-incident side of the image sensor 54. The support mechanism 18 has a fixed body side supporting magnet 20 and a movable body side supporting magnet 22. The fixed body side supporting magnet 20 is fixed to a base not shown. The movable body side supporting magnet 22 is fixed to the back surface of the image sensor 54 and is also an optical member side supporting magnet. The magnetic fluid 30 is disposed between the fixed body-side supporting magnet 20 and the movable body-side supporting magnet 22 as in the first embodiment described above, and the support mechanism 18 moves in the YZ axis direction of the image sensor 54. I support it as possible.

  The fixed body side supporting magnet 20 and the movable body side supporting magnet 22 are formed in a rectangular shape, and are constituted of, for example, four divided pieces 56. In the divided pieces 56, those magnetized in the + X direction and those magnetized in the -X direction are alternately circulated around the X axis. Even in this configuration, even if a force rotating about the X axis acts, a repulsive force acts and a force trying to return to the original angle works, so the image sensor 54 is difficult to rotate. Further, on the magnetic pole surfaces of adjacent divided pieces 56, reservoir grooves 38 which are alternately extended in the Z direction and the Y direction are formed.

  Each divided piece 56 is fixed by bonding or the like at the boundary portion, and a chamfer 58 is formed at this boundary portion. If the chamfer 58 is not formed, there is a possibility that the sliding of the movable body side supporting magnet 22 with respect to the fixed body side supporting magnet 20 may be impeded by a step that may occur in the boundary portion. Thus, the inhibition of the sliding displacement can be reduced.

  Although the drive device for the bending optical system has been described in the above two embodiments, the support mechanism 18 may be used in a normal optical member drive device (lens drive device) in which a light beam goes straight.

  Further, the mounting of the support mechanism 18 is not limited to the lens body and the image sensor, but may be provided to the prism 12 shown in FIG. Also, these optical member drive devices and camera devices can be mounted on electronic devices such as mobile phones and smart phones.

DESCRIPTION OF SYMBOLS 10 Camera apparatus 12 Prism 14 Lens body 18 Support mechanism 20 Fixed body side support magnet 22 Movable body side support magnet 24 Y side drive magnet 26 Y side drive coil 28 Z side drive coil 30 Magnetic fluid 32 1st magnetic pole surface 34 2nd magnetic pole Surfaces 36 and 38 Reservoir groove 40 Bottom portion 42 Wall surface portion 44 Fixed body side sliding portion 46 Movable body side sliding portion 48 First sliding surface 50 Second sliding surface 52 Optical member driving device 54 Image sensor 56 Division piece 58 Chamfering

Claims (14)

  It has a supporting magnet pair in which one is mounted on a fixed body and the other is mounted on a movable body, and pole faces having different magnetic poles face each other, and one mounted on the movable body of the supporting magnet pair A second sliding surface formed on a second magnetic pole surface of the movable-body-side supporting magnet, the first magnetic pole of the fixed-body-side supporting magnet being mounted on the fixed body of the supporting magnet pair A support mechanism configured to slide relative to a first sliding surface formed on the surface.   The support mechanism according to claim 1, wherein a magnetic fluid is disposed between the first sliding surface and the second sliding surface.   The support mechanism according to claim 2, wherein a reservoir groove in which the magnetic fluid is accumulated is formed on at least one of the first sliding surface and the second sliding surface.   A reservoir groove in which the magnetic fluid is collected is provided in both the first sliding surface and the second sliding surface, and the reservoir groove formed in the first sliding surface and the second sliding surface are formed The support mechanism according to claim 3, wherein the support groove is formed in a direction intersecting with the accumulation groove.   The said accumulation groove has a wall surface part which stands | starts up from the bottom face, This wall surface part is formed by the gradient smaller than 90 degree | times with respect to the said 1st sliding face or a 2nd sliding face. Support mechanism.   The support mechanism according to any one of claims 1 to 5, wherein the first sliding surface and the second sliding surface have substantially equal dimensions in a predetermined direction.   The support mechanism according to any one of claims 1 to 6, wherein a sliding portion is further provided on at least one of the first magnetic pole surface and the second magnetic pole surface, and the sliding surface is formed on the sliding portion. Fixed body,
An optical member holder for holding the optical member;
And a support mechanism movably supporting the optical member holder with respect to the fixed body,
The support mechanism is
It has a supporting magnet pair in which one is mounted on the fixed body and the other is mounted on the optical member holder, and pole faces having different magnetic poles face each other, and the optical member holder of the supporting magnet pair is mounted on the optical member holder The second sliding surface formed on the second magnetic pole surface of the optical member side supporting magnet, which is the one mounted, is for the fixed body side supporting, which is the one mounted on the fixed body of the supporting magnet pair An optical member driving device configured to slide on a first sliding surface formed on a first magnetic pole surface of a magnet.   9. The optical member driving device according to claim 8, wherein the support mechanism is disposed at four corners of the optical member holder centered on the optical axis of the optical member.   The optical member holder has a support mechanism arrangement portion cut out in a triangular shape at the four corners, and the optical member side support magnet of the support mechanism is the support mechanism arrangement portion as viewed from the optical axis direction. The optical member drive device according to claim 9, formed in a triangular shape corresponding to the triangular shape, and disposed in the support mechanism arrangement portion.   The optical member is an image sensor formed in a rectangular shape, and the support mechanism is divided into four parts so as to be circularly disposed around the center of the image sensor The optical member drive device according to claim 8, further comprising a magnet.   12. The optical member driving device according to claim 11, wherein magnetic pole surfaces of adjacent divided pieces of the fixed body side supporting magnet and the optical member side supporting magnet divided into four have different magnetic poles.   A camera apparatus comprising the optical member drive device according to any one of claims 8 to 12.   An electronic apparatus comprising the camera device according to claim 13.

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