JP6909712B2 - Support mechanism, optical member drive device, camera device and electronic device - Google Patents

Description

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

For example, a support mechanism that movably supports an optical member is used in a driving device that drives an optical member such as a lens. As the support mechanism, as shown in Patent Document 1, a spring is used, and as shown in Patent Document 2, a ball is used.

Japanese Unexamined Patent Publication No. 2011-65140 U.S. Patent Application Publication No. 2015/0256727

However, in the support mechanism using a spring, the spring may buckle when an impact is received, and in the support mechanism using a ball, the ball separates from the frame due to the impact and the ball hits the frame again. There is a risk of damaging the frame. All of the support mechanisms have a problem that they are vulnerable to impact and lack stability.

An object of the present invention is to provide a support mechanism, an optical member drive device, a camera device, and an electronic device capable of stably and movably supporting an object to be supported by solving the above-mentioned conventional problems. do.

One aspect of the present invention is a support mechanism, the support mechanism comprising at least four or more slide pieces cyclically arranged around a predetermined axis, the adjacent slide pieces attracting and moving to each other. It is configured to be flexible, one piece of the slide piece is a fixed piece fixed to the stator, the other piece is a movable piece fixed to the mover, and the remaining slide piece is the fixed piece and the movable piece. It is a connecting piece for connecting the pieces.

Preferably, the slide piece has a planar facing surface on which the adjacent slide pieces face each other.

Further, preferably, the slide piece is formed with a notch parallel to the predetermined axial direction at the ridge line portion where the facing surfaces of the slide piece intersect.

Further, preferably, a viscoelastic body is interposed between the slide pieces.

As the viscoelastic body, an elastic adhesive or a viscoelastic body may be bonded with an adhesive, but a magnetic fluid is preferably used.

When a magnetic fluid is used as the viscoelastic body, it is preferable that at least two of the slide pieces are composed of magnets, and the magnetic fluid is interposed between the at least two magnets.

Further, preferably, the magnetizing directions of the slide pieces composed of the magnets and adjacent to each other are different from each other.

Further, a lubricating layer may be interposed between the slide pieces.

Another aspect of the present invention is an optical member driving device, which has a stator, an optical member, and a support mechanism that movably supports the optical member with respect to the stator. The support mechanism includes at least four or more slide pieces cyclically arranged around a predetermined axis, and each of the adjacent slide pieces is configured to be attracted to and movable with respect to the slide pieces. One piece is a fixed piece fixed to the stator, the other piece is a movable piece fixed to the optical member, and the remaining slide piece is a connecting piece for connecting the fixed piece and the movable piece. Will be done.

Another aspect of the present invention is a camera device having the above-mentioned optical member driving device.

Furthermore, another aspect of the present invention is an electronic device having the above-mentioned camera device.

According to the present invention, since it is configured to include at least four slide pieces that attract the support mechanism, it can be stably and movably supported with respect to the object to be supported.

It is a perspective view which shows the support mechanism which concerns on 1st Embodiment of this invention, and was seen from obliquely above. It is a top view which shows the support mechanism which concerns on 1st Embodiment of this invention. It shows the support mechanism which concerns on 1st Embodiment of this invention, and is the top view when the force in a direction is applied to a movable piece. It shows the support mechanism which concerns on 1st Embodiment of this invention, and is the top view when the force in the b direction is applied to a movable piece. It shows the support mechanism which concerns on 1st Embodiment of this invention, and is the top view when the force in the ab synthesis direction is applied to the movable piece. It is a perspective view which shows the support mechanism which concerns on 1st Embodiment of this invention, and is the case where the force in the c direction is applied to a movable piece. It is a top view which shows the support mechanism which concerns on 2nd Embodiment of this invention. It is a perspective view which shows the support mechanism which concerns on 3rd Embodiment of this invention. It is a top view which shows the support mechanism which concerns on 4th Embodiment of this invention. It is a perspective view which shows the camera apparatus of 1st Embodiment which used the support mechanism which concerns on 1st Embodiment of this invention, and was seen from one side obliquely. It is a perspective view which shows the camera apparatus of 1st Embodiment which used the support mechanism which concerns on 1st Embodiment of this invention, and was seen from the other side obliquely. The camera apparatus of the 2nd Embodiment using the support mechanism which concerns on the 1st Embodiment of this invention is shown, and it is the perspective view seen from the other side obliquely.

Embodiments of the present invention will be described with reference to the drawings.

1 to 6 show a support mechanism 10 according to a first embodiment of the present invention. The support mechanism 10 has at least four slide pieces, and in the first embodiment, the support mechanism 10 is composed of four slide pieces 12a, 12b, 12c, and 12d.

Assuming that one direction of the three-dimensional Cartesian coordinate system is a, the direction orthogonal to this is b, and the direction orthogonal to a and b is c, the four slide pieces 12a, 12b, 12c, and 12d are in the c direction. It is cyclically arranged around a predetermined axis Co.

Further, each slide piece 12a, 12b, 12c, 12d has a square columnar shape extending in the c direction, for example. Further, each slide piece 12a, 12b, 12c, 12d has a planar facing surface 14a-1, 14a-2, 14b-1, 14b-2 so as to face the adjacent slide pieces 12a, 12b, 12c, 12d. , 14c-1, 14c-2, 14d-1, 14d-2. Further, each slide piece 12a, 12b, 12c, 12d has substantially the same dimensions in each direction of abc.

That is, the facing surface 14a-1 of the slide piece 12a faces the facing surface 14b-1 of the slide piece 12b, and the facing surface 14b-2 of the slide piece 12b faces the facing surface 14c-2 of the slide piece 12c. The facing surface 14c-1 of the slide piece 12c faces the facing surface 14d-1 of the slide piece 12d, and the facing surface 14d-2 of the slide piece 12d faces the facing surface 14a-2 of the slide piece 12a.

Further, in the slide pieces 12a, 12b, 12c, 12d, the facing surfaces 4a-1 and 14a-2, 14b-1 and 14b-2, 14c-1 and 14c-2, 14d-1 and 14d-2 intersect. Notches 16a, 16b, 16c, 16d are formed at the ridgeline portion. The notches 16a, 16b, 16c, and 16d are formed in parallel with the above-mentioned axis Co, and provide a space 18 parallel to the axis Co in each ridge line portion.

Further, between the slide pieces 12a, 12b, 12c, 12d, that is, the facing surfaces 14a-1 and 14b-1, 14b-2 and 14c-2, 14c-1 and 14d-1, 14d-2 and 14a-2. A viscoelastic body 20 is interposed between the space and the space 18. The viscoelastic body 20 is made of a magnetic fluid in this first embodiment.

The slide pieces 12a, 12b, 12c, 12d are composed of permanent magnets. Adjacent slide pieces 12a and 12b, 12b and 12c, 12c and 12d, and 12d and 12a are magnetized in different directions. As a result, with the axis Co as the target axis, the slide pieces 12a and 12c and 12b and 12d at the 180-degree rotation target positions face in opposite directions.

That is, as shown in FIG. 2, for example, the slide pieces 12a and 12c both have an north pole on the outside and an S pole on the inside when viewed from the axis Co, and the slide pieces 12b and 12c are both outside when viewed from the axis Co. Is the south pole and the inside is the north pole.

The permanent magnets of the slide pieces 12a to 12d may be made of an alloy type (SmCo magnet, NdFeB magnet, etc.) without limitation, but a ceramic type (Ba ferrite, Sr ferrite, etc.) is preferably used to face the facing surface. Is surface-ground to ensure smooth movement.

As a result, the slide pieces 12a and the slide pieces 12c and the slide pieces 12b and the slide pieces 12d that are in a facing positional relationship repel each other, while the slide pieces 12a, the slide pieces 12b, and the slide pieces 12b that are adjacent slide pieces are adjacent to each other. The slide piece 12c, the slide piece 12c and the slide piece 12d, and the slide piece d and the slide piece 12a are attracted to each other.
As a result, when no external force is applied to the slide pieces 12a to 12d, the slide pieces 12a to 12d are opened at equal intervals and are connected in a bead shape around the axis Co.

As described above, the viscoelastic body 20 is made of a magnetic fluid. This magnetic fluid is attracted by the magnetic force of the slide pieces 12a to 12d and is not sandwiched between the slide pieces 12a to 12d and leaks to the outside, reducing the friction generated between the slide pieces 12a to 12d. It also plays a role of damping.

When the slide piece 12a is a fixed piece fixed to the stator, the slide piece 12c is a movable piece fixed to the mover, and the slide piece 12b and the slide piece 12d are connecting pieces for connecting the fixed piece and the movable piece. The operation of is described.
In the following operation description, the slide piece 12a is a fixed piece 12a, the slide piece 12c is a movable piece 12c, and the slide pieces 12b and 12d are connected pieces 12b and 12d.

As shown in FIG. 3, when a force is applied to the movable piece 12c in the a direction, the fixed piece 12a and the connecting pieces 12b and 12d adjacent to the fixed piece 12a, and the movable piece 12c and the movable piece 12c are adjacent to each other. The viscoelastic body (magnetic fluid) 20 is deformed while the connecting pieces 12b and 12d are attracted to each other by magnetic force and connected to each other, and the movable piece 12c and the connecting piece 12d move in the a direction with respect to the fixed piece 12a. .. Then, when the force in the a direction is removed, it returns to the original position due to the magnetic force.

As shown in FIG. 4, when a force is applied to the movable piece 12c in the b direction, the fixed piece 12a and the connecting pieces 12b and 12d adjacent to the fixed piece 12a, and the movable piece 12c and the movable piece 12c are adjacent to each other. The viscoelastic body 20 is deformed while the connecting pieces 12b and 12d are attracted to each other by magnetic force and connected to each other, and the movable piece 12c and the connecting piece 12b move in the b direction with respect to the fixed piece 12a. Then, when the force in the b direction is removed, it returns to the original position due to the magnetic force.

As shown in FIG. 5, when a force is applied to the movable piece 12c in the ab synthesis direction (in the case of FIG. 5, the + a and −b directions), the fixed piece 12a and the connecting pieces 12b and 12d adjacent to the fixed piece 12a The viscoelastic body 20 is deformed while the movable piece 12c and the connecting pieces 12b and 12d adjacent to the movable piece 12c are attracted to each other by magnetic force and connected to each other, and the movable piece 12c is attached to the fixed piece 12a. The connecting pieces 12b and 12d move in the ab synthesis direction so that the distance between them is short and the distance between them is long. Then, when the force in the ab direction is removed, it returns to the original position due to the magnetic force.

Here, the fixed piece 12a and the movable piece 12c are closer to each other in the ab synthesis direction, but the fixed piece 12a and the movable piece 12c are formed with notches 16a and 16c, so that the movable piece 12c is formed. It is possible to avoid hitting the fixed piece 12a.

When a force in the direction opposite to that in FIG. 5 is applied to the movable piece 12c, the distance between the connecting pieces 12b and 12d is shortened, but the connecting pieces 12b and 12d are formed with notches 16b and 16d. Similarly, the collision of the connecting pieces 12b and 12d can be avoided, and the movable piece 12c can be smoothly separated from the fixed piece 12a.

As shown in FIG. 6, when a force is applied to the movable piece 12c in the c direction, the fixed piece 12a and the connecting pieces 12b and 12d adjacent to the fixed piece 12a, and the movable piece 12c and the movable piece 12c are adjacent to each other. The viscoelastic body 20 is deformed while the connecting pieces 12b and 12d are attracted to each other by magnetic force and connected to each other, and the movable pieces 12c and the connecting pieces 12b and 12c move in the c direction with respect to the fixed pieces 12a. Then, when the force in the c direction is removed, it returns to the original position due to the magnetic force.

Although not shown, when a force is applied to the movable piece 12c in the abc synthesis direction, the movable piece 12c and the connecting pieces 12b, 12c move in the abc synthesis direction with respect to the fixed piece 12a in the same manner.

As described above, in the present support mechanism 10, the movable piece 12c has three degrees of freedom with respect to the fixed piece 12a.

Here, even if the movable pieces 12c and the connecting pieces 12b and 12d move in each direction of the abc, the sandwiched magnetic fluid 20 smoothly moves the movable pieces 12c and the connecting pieces 12b and 12d without flowing out. Further, even if an impact is applied to the movable piece 12c and the connecting pieces 12b and 12d, the magnetic fluid 20 absorbs the impact force. Further, even if the slide pieces 12a, 12b, 12c, and 12d are separated from each other due to an impact, they are in contact with each other on the surface when they are reconnected, so that they are not easily damaged by each other.
Further, for example, if a force is applied in the + a direction above the paper surface and in the −a direction below the paper surface in FIG. 1, a rotational force is generated. However, in that case, a repulsive force is generated by the magnetic force, and the force acts to return to the original position (direction). Therefore, such rotation is difficult.

FIG. 7 shows a support mechanism 10 according to a second embodiment of the present invention.

This second embodiment is different from the first embodiment described above in that the magnetizing direction of the slide pieces 12a to 12d is the longitudinal direction along the axis Co.

That is, the slide piece 12a which is a fixed piece and the slide piece 12c which is a movable piece are magnetized in the −c direction, and the slide pieces 12b and 12d which are the connecting pieces are magnetized in the + c direction. Also in this second embodiment, the adjacent slide pieces 12a to 12d are attracted to each other.
The same parts as those in the first embodiment are designated by the same numbers in the drawings, and the description thereof will be omitted.

FIG. 8 shows a support mechanism 10 according to a third embodiment of the present invention.

In the third embodiment, the support mechanism 10 has eight slide pieces 12a to 12h, and the eight slide pieces 12a to 12h extend along the axis Co and are divided into uniform angles to form a cylinder. It is formed.

In this third embodiment, for example, the slide piece 12a is a fixed piece, the slide piece 12e is a movable piece, and the slide pieces 12b to 12d and 12f to 12h are connected pieces. With this configuration, the number of connecting pieces 12b to 12d and 12f to 12h is larger than that of the first embodiment, so that the movable piece 12e can be moved smoothly.

However, the number of fixed pieces or movable pieces is not limited to one, and there may be a plurality of fixed pieces. For example, in addition to the slide piece 12e, the slide piece 12c and the slide piece 12g can be used as movable pieces.

FIG. 9 shows a support mechanism 10 according to a fourth embodiment of the present invention.

In the fourth embodiment, the lubricating layer 22 is fixedly formed on the facing surfaces 14b-1, 14b-2, 14d-1, 12d-2 and the notches 16b and 16d of the slide pieces 12b and 12d which are the connecting pieces. There is.
The lubricating layer 22 uses a member having a low coefficient of friction such as acetal resin or fluororesin, and enables smoother movement of the slide piece 12c, which is a movable piece, as well as lubrication by the magnetic fluid 20.
Not limited to the above, the lubricating layer 22 may be formed on the facing surfaces of any of the slide pieces 12a to 12d. Further, it is not necessary to use the magnetic fluid 20.
The same parts as those in the first embodiment are designated by the same numbers in the drawings, and the description thereof will be omitted.

The surfaces of the facing surfaces 14a-1 to 14d-2 may be roughened to reduce the actual contact area and the friction coefficient may be reduced. Further, the magnetic fluid 20 may or may not be a normal so-called lubricant.
Further, the slide pieces 12a, 12b, 12c and 12d do not all have to be magnets. For example, the fixed piece 12a and the movable piece 12c may be formed of a magnet and the connecting pieces 12b and 12d may be formed of a soft magnetic material. ..

10 and 11 show a first embodiment of the camera device 24 using the support mechanism 10 according to the first embodiment.

The camera device 24 has a bending optical system composed of a prism 26 having a triangular cross section and a lens body 28 having a rectangular parallelepiped shape.
The direction in which light is incident on the prism 26 is Z, the direction in which light is emitted from the lens body 28 is X, and the direction orthogonal to Z and X is Y.

The light from the subject incident from the Z direction is reflected in the X direction on the slope of the prism 26 and is incident on the lens body 28. The light emitted through the lens body 28 is imaged on an image sensor (not shown) and captured as a captured image.

The support mechanism 10 is provided below the side surface of the lens body 28 in the Y direction so that the axis Co is in the X direction. The slide pieces 12a and 12a, which are fixed pieces, are fixed to the base 30 which is a stator. Further, the slide pieces 12c and 12c, which are movable pieces, are fixed to the lower side surface of the lens body 28 which is a mover and an optical member.

As shown in FIG. 10, a rectangular parallelepiped Y-side drive magnet 32 magnetized in the + Y direction is attached to one side surface of the lens body 28 on the Y-side, and the Y-side drive coil is located at a position facing each other across a gap. 34 is arranged, and the Y side drive coil 34 is attached to the base 30 side.

As shown in FIG. 11, a rectangular parallelepiped Z-side drive magnet 36 divided into two pieces in the Z direction and magnetized in the + Y direction and the −Y direction is attached to the other side surface of the lens body 28 on the Y side. The Z-side drive coil 38 is arranged at a position facing each other with a gap between them, and the Z-side drive coil 38 is attached to the base 30 side.

Further, on the other side surface of the lens body 28, a rectangular parallelepiped-shaped X-side drive magnet 40 divided into two pieces in the X direction and magnetized in the + Y direction and the −Y direction is attached, and the positions facing each other across a gap. The X-side drive coil 42 is arranged in the base 30 side, and the X-side drive coil 42 is attached to the base 30 side.

In the above configuration, when the Y-side drive coil 32 is energized, a Lorentz force that moves the Y-side drive magnet 32 in the Y direction is generated in the Y-side drive coil 34. When the Z-side drive coil 38 is energized, a Lorentz force that moves the Z-side drive magnet 36 in the Z direction is generated in the Z-side drive coil 38. When the X-side drive coil 42 is energized, a Lorentz force that moves the X-side drive magnet 40 in the X direction is generated in the X-side drive coil 42. The Lorentz force generated in these X, Y, and Z directions acts as a reaction force on the X / Y / Z side drive magnets 40, 32, and 36, and causes the lens body 28 to act in each of the X, Y, Z directions and the synthesis direction. Acts as a driving force to.

Since the lens body 28 is supported by the support mechanism 10 described above, the lens body 28 can be moved in a predetermined three-axis direction with the generation of a driving force. That is, focusing can be achieved by moving the lens body 28 in the X direction, and camera shake correction can be performed by moving the lens body 28 in the Y direction and / or the Z direction.

FIG. 12 shows a second embodiment according to the camera device 24 of the present invention.

In the first embodiment described above, the support mechanism 10 is provided below the two side surfaces in the Y direction of the lens body 28, but in the second embodiment, the support mechanism 10 is located below the two side surfaces in the X direction of the lens body 28. The point that it is provided is different.

In short, the mounting position and the number of mountings of the support mechanism 10 are not limited to the above-described embodiment, for example, one support mechanism 10 is mounted below the Y-side side surface, the other support mechanism 10 is mounted above the Y-side side surface, and the like. Various deformations are possible. The number of support mechanisms 10 may be one.

Since the support mechanism 10 is small and needs to be attached only to the Y-side side surface of the lens body 28, the Z-side dimension of the camera device 24 can be kept low, and the terminal device to be mounted can be made thinner.

In the above two embodiments, the driving device of the bending optical system has been described, but the support mechanism 10 may be used for a normal optical member driving device (lens driving device) in which light rays travel straight.

Further, the support mechanism 10 may be attached not only to the lens body but also to the prism 26, or may be attached to the image sensor to move the image sensor by three axes. These optical member driving devices (lens driving devices) and camera devices 24 can be mounted on electronic devices such as mobile phones and smartphones.

10 Support mechanism 12a to 12h Slide pieces 14a-1, 14a-2 to 14d-1, 14d-2 Facing surfaces 16a to 16d Notch 18 Space 20 Viscoelastic body (magnetic fluid)
22 Lubrication layer 24 Camera device 26 Prism 28 Lens body 30 Base 32 Y side drive magnet 34 Y side drive coil 36 Z side drive magnet 38 Z side drive coil 40 X side drive magnet 42 X side drive coil

Claims (11)

It comprises at least four or more slide pieces cyclically arranged around a predetermined axis, and each of the adjacent slide pieces is configured to be attracted to and movable with respect to each other, and one piece of the slide piece is fixed to the stator. A support mechanism in which the other piece is a movable piece fixed to the mover, and the remaining slide piece is a connecting piece for connecting the fixed piece and the movable piece. The support mechanism according to claim 1, wherein the slide piece has a planar facing surface on which the adjacent slide pieces face each other. The support mechanism according to claim 2, wherein the slide piece has a notch formed in parallel with the predetermined axial direction at a ridge line portion where the facing surfaces of the slide piece intersect. The support mechanism according to any one of claims 1 to 3, wherein a viscoelastic body is interposed between the slide pieces. The support mechanism according to any one of claims 1 to 4, wherein at least two of the slide pieces are composed of magnets. The support mechanism according to claim 5, wherein a magnetic fluid is interposed between the slide pieces composed of the magnets. The support mechanism according to claim 5 or 6, wherein the slide pieces composed of the magnets and adjacent to each other have different magnetizing directions. The support mechanism according to any one of claims 1 to 7, wherein a lubricating layer is interposed between the slide pieces. With the stator,
Optical members and
It has a support mechanism that movably supports the optical member with respect to the stator.
The support mechanism
It comprises at least four or more slide pieces cyclically arranged around a predetermined axis, and each of the adjacent slide pieces is configured to be attracted to and movable with respect to each other, and one piece of the slide piece is attached to the stator. An optical member drive, which is a fixed piece to be fixed, another piece is a movable piece fixed to the optical member, and the remaining slide piece is a connecting piece for connecting the fixed piece and the movable piece. Device. A camera device having the optical member driving device according to claim 9. An electronic device having the camera device according to claim 10.

Images