JP2020043703A - Driving device, lens driving device, and electronic apparatus - Google Patents

Abstract

To provide a driving device, a lens driving device, and an electronic apparatus, capable of obtaining a smooth motion without being limited in resolution while moving at a high speed.SOLUTION: The driving device includes: a fixed unit; a movable unit that is movable with respect to the fixed unit and holds an optical member; a sliding unit provided between the movable unit and the fixed unit; and a voice coil motor for moving the movable unit with respect to the fixed unit. The movable unit is urged by the fixed unit.SELECTED DRAWING: Figure 6

Description

  One embodiment of the present invention relates to a lens actuator or the like used for an imaging device such as a camera.

  2. Description of the Related Art Conventionally, some imaging devices such as cameras include an actuator that drives an optical member such as a lens using a permanent magnet and a coil. Such an actuator is disclosed in, for example, Patent Documents 1 to 3 and the like.

JP 2011-165272 A JP-A-2006-9194 JP 2009-124842 A

  In recent image sensors, since the density of light receiving elements has been increased, an actuator capable of precisely controlling the position of an optical member such as a lens is required. For example, in a lens driving device described in Patent Document 1, a stepping motor is used as an actuator for driving a lens. However, when precise position control is performed using a stepping motor, the resolution may be limited by steps. Further, when the resolution of the step of the stepping motor is increased, the moving speed of the optical member may be reduced.

  The present invention employs the following means in order to solve the above-described problems and the like. In the following description, reference numerals and the like in the drawings are added in parentheses to facilitate understanding of the invention, but each component of the present invention is not limited to these additions, and the present invention is not limited thereto. It should be widely interpreted to a technically understandable range by a trader.

One means of the present invention is:
A fixing part (7),
A movable part (3F) movable with respect to the fixed part and holding the optical member;
A sliding portion (4F) provided between the movable portion and the fixed portion;
A voice coil motor (8F) for moving the movable part with respect to the fixed part,
The movable portion is biased toward the fixed portion,
It is a driving device.

  According to the driving device having the above configuration, by using the voice coil motor, the movable unit can be moved at a high speed, and the movable unit can be moved to any position without being limited by the resolution.

In the above driving device, preferably,
There is further provided an urging unit (attraction magnet 14FL, attraction magnets 14FR and 42) for urging the movable unit to the fixed unit via the sliding unit by magnetic force.

  When a gear mechanism is provided for the purpose of increasing the resolution of a stepping motor, play may occur due to meshing of gears. According to the drive device having the above configuration, the movable portion can be smoothly moved relative to the fixed portion by urging the movable portion to the fixed portion via the sliding portion. Further, since the movable portion and the fixed portion can be urged without physically connecting the movable portion and the fixed portion via the urging portion, it is possible to prevent the smooth movement of the movable portion from being impaired by the urging portion. be able to. Further, by using the magnetic force, even when the moving range of the movable portion is wide, it is possible to uniformly bias the movable portion.

In the above driving device, preferably,
The fixed portion includes a columnar portion (48) extending along a moving direction (z-axis) of the movable portion,
The movable portion has an opposing portion facing the columnar portion.

  According to the driving device having the above configuration, the movable section can be moved while the direction of the movable section with respect to the extending direction of the columnar section is stabilized.

The movable portion has a through hole through which the columnar portion is inserted,
The facing portion is an inner surface of the through hole.

  According to the driving device having the above structure, the movement of the movable portion in the direction orthogonal to the direction in which the columnar portion extends can be limited. For example, a ball bearing or the like is provided between the fixed portion and the movable portion. In this configuration, it is possible to prevent the ball bearing from coming off due to an impact when the driving device falls.

In the above driving device, preferably,
The through hole is a long hole extending in a direction (y-axis) in which the movable portion is urged.

  For example, when the movement of the movable part is restricted in the direction in which the movable part is urged, a gap may be generated between the sliding part and the movable part or the fixed part. In this case, the movable part, the sliding part, and the fixed part do not adhere to each other, and the movement of the movable part may become unstable. According to the driving device having the above-described configuration, since the through hole extends in the direction in which the movable portion is urged, the restriction on the movement of the movable portion in the direction can be relaxed. The parts can be brought into close contact with each other. Thereby, the movable part can be moved stably. Further, for example, by reducing the difference between the short axis of the long hole and the outer diameter of the columnar portion, the rotation of the movable portion about the long axis of the long hole as the rotation axis is suppressed by the contact between the long hole and the columnar portion. be able to. Further, the assemblability of the driving device can be improved.

In the above driving device, preferably,
The sliding portion is a ball bearing (31F).

  According to the driving device having the above-described configuration, the friction during driving can be reduced, so that the power consumption of the driving device can be reduced. Further, since the difference between the static friction and the dynamic friction can be reduced, the difference between the force required to start the movement and the force required while moving can be reduced. Thereby, the responsiveness of the movable part can be improved.

  The fixed portion includes a plate portion (42) that is in contact with the ball bearing and extends along a moving direction of the movable portion.

  According to the driving device having the above configuration, the movable portion can be moved stably and smoothly with a simple configuration in which the ball bearing is rolled along the plate portion. In addition, it is possible to suppress the deformation of the bearing surface of the ball bearing due to the impact at the time of dropping, and it is possible to reduce the wear of the bearing surface and improve the durability.

In the above driving device, preferably,
The driving device includes a plurality of the movable parts (3F, 3B).

  According to the driving device having the above configuration, the plurality of optical members can be moved independently of each other. For example, by driving the plurality of lens systems independently of each other, the zoom mechanism and the autofocus mechanism in the electronic device can be improved. Can be realized.

In the above driving device, preferably,
The urging unit,
A first permanent magnet (14FL, 14FR) provided on one of the movable part and the fixed part;
And a ferromagnetic material (42L, 42R) provided on the other side.

  According to the driving device having the above configuration, the arrangement of the urging unit can be effectively simplified, and the movable unit and the fixed unit are not physically connected to each other via the urging unit. Can be urged, so that the smooth movement of the movable portion can be prevented from being impaired by the urging portion. Further, by using the magnetic force, even when the moving range of the movable portion is wide, it is possible to uniformly bias the movable portion.

In the above driving device, preferably,
The fixed portion includes a plate portion of the ferromagnetic material that is in contact with the ball bearing and extends along a moving direction of the movable portion.
The first permanent magnet is provided in the movable part, and urges the movable part toward the fixed part by an attractive force generated between the first permanent magnet and the plate part.

  According to the driving device having the above configuration, it is possible to easily realize a configuration in which the movable portion is biased toward the fixed portion.

In the above driving device, preferably,
The fixing part,
Including annular yokes (43F, 45F)
The voice coil motor,
A coil (12F) provided on the movable part and through which the yoke is inserted;
A second permanent magnet (44F) fixed to the inner peripheral surface of the yoke.

  According to the driving device having the above configuration, by applying a current to the coil, a propulsive force along the circumferential direction of the yoke can be applied to the coil, so that the movable portion can be moved at high speed and stably.

  Any of the above driving devices is suitably applied to a lens driving device incorporated in a smartphone, a camera, a projector, or the like.

  According to the lens driving device having the above configuration, by using the voice coil motor, the movable portion can be moved at a high speed, and the movable portion can be moved to any position without being limited by the resolution.

  Any one of the above driving devices or the above lens driving device is suitably applied to electronic devices such as a smartphone, a camera, and a projector.

  According to the electronic device having the above configuration, by using the voice coil motor, the movable unit can be moved at a high speed, and the movable unit can be moved to any position without being limited by the resolution.

FIG. 1 is a front view of the VCM unit of the present embodiment. FIG. 2 is a plan view of the VCM unit of the present embodiment. FIG. 3 is a rear view of the VCM unit of the present embodiment. FIG. 4 is a side view of the VCM unit according to the present embodiment as viewed from the shaft guide side. FIG. 5 is a side view of the VCM unit according to the present embodiment as viewed from the base member side. FIG. 6 is an exploded view of the VCM unit of the present embodiment. FIG. 7 is a front view of the VCM unit of the present embodiment. FIG. 8 is a sectional view of the VCM unit of the present embodiment. FIG. 9 is a sectional view of the VCM unit of the present embodiment. FIG. 10 is a sectional view of the VCM unit of the present embodiment. FIG. 11 is a sectional view of the VCM unit of the present embodiment.

  The driving device of the present invention is movable with respect to a fixed portion and holds an optical member, for the purpose of moving smoothly at a higher speed than the conventional configuration and without being limited by the resolution. One of the features is that the moving part is moved relative to the fixed part by a voice coil motor, and the movable part is biased to the fixed part via a sliding part provided between the moving part and the fixed part. I do.

An embodiment according to the present invention will be described according to the following configuration. However, the embodiments described below are merely examples of the present invention, and do not limit the technical scope of the present invention. In the drawings, the same components are denoted by the same reference numerals, and description thereof may be omitted.
1. 1. Embodiment (1) Configuration Example of Electronic Device (2) Configuration Example of VCM (Voice Coil Motor) Unit Features of the invention Supplementary information

<1. This embodiment>
<(1) Configuration example of electronic device>
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the VCM unit of the present embodiment. FIG. 2 is a plan view of the VCM unit of the present embodiment. FIG. 3 is a rear view of the VCM unit of the present embodiment. FIG. 4 is a side view of the VCM unit according to the present embodiment as viewed from the shaft guide side. FIG. 5 is a side view of the VCM unit according to the present embodiment as viewed from the base member side. FIG. 6 is an exploded view of the VCM unit of the present embodiment.

  As shown in FIGS. 1 to 6, the electronic apparatus according to the present embodiment includes a VCM unit 1, an optical system (not shown), an image sensor (not shown), and a main body (not shown). The VCM unit 1 includes movable parts 3F and 3B, sliding parts 4F and 4B, a fixed part 7, voice coil motors 8F and 8B, and FPC (Flexible Printed Circuits) 49. Hereinafter, each of the movable parts 3F and 3B may be referred to as a movable part 3. Each of the sliding portions 4F and 4B may be referred to as a sliding portion 4. Each of the voice coil motors 8F and 8B may be referred to as a voice coil motor 8. The VCM unit 1 is a specific example of the “drive device” and the “lens drive device” in the present invention.

  Each drawing shows an x-axis, a y-axis, and a z-axis. An axis parallel to the optical axis of the lens and facing the base member 41 as viewed from the shaft guide 47 is defined as “z axis”. In other words, the “z axis” is an axis that is parallel to the direction in which the movable section 3 moves (hereinafter, may be referred to as a moving direction), and is an axis that faces the base member 41 when viewed from the shaft guide 47. It is. That is, since the “z axis” and the “optical axis” are parallel, the “optical axis direction”, the “z axis direction”, and the “moving direction” are the same direction. An axis perpendicular to the z-axis and facing the shaft 48 as viewed from the magnet housing 41a is defined as "y-axis". An axis perpendicular to both the z-axis and the y-axis and facing the shaft 48 when viewed from the FPC 49 is defined as an “x-axis”. Here, the x-axis, the y-axis, and the z-axis form right-handed three-dimensional orthogonal coordinates. Hereinafter, the direction of the arrow of the z-axis may be referred to as the z-axis plus side, and the direction opposite to the arrow may be referred to as the z-axis minus side, and the same applies to other axes.

<Electronic equipment>
The electronic device is, for example, a wireless terminal device such as a smartphone or a mobile phone, an imaging device such as a camera, or a projector. The optical system includes, for example, a plurality of lens barrels that store lenses, and forms a light beam from a subject on an image sensor. The imaging device captures a subject and generates an image. Specifically, the image sensor is, for example, a charge-coupled device (CCD) image sensor or a complementary metal-oxide-semiconductor (CMOS) image sensor, and is provided on a substrate. The substrate is fixed to the main body. Note that the imaging device is not limited to a CCD or a CMOS, and may be replaced with another image sensor that functions as a photoelectric conversion device. A lens is a specific example of the “optical member” in the present invention.

<(2) Configuration example of VCM unit>
<Fixing part 7>
As shown mainly in FIG. 6, the fixing unit 7 is configured to include dedicated fixing units 5F and 5B and a common fixing unit 6. The dedicated fixing portion 5F includes a back yoke 43F, an iron core 45F, and a buffer member 46F. The dedicated fixing portion 5B includes a back yoke 43B, an iron core 45B, and a buffer member 46B. The common fixing portion 6 includes a base member 41, bearing seats 42R and 42L, a shaft guide 47 and a shaft 48. The voice coil motor 8F includes a coil 12F and a drive magnet 44F. The voice coil motor 8B includes the coil 12B and the driving magnet 44B.

  Hereinafter, each of the dedicated fixing portions 5F and 5B may be referred to as a dedicated fixing portion 5. Each of the back yokes 43F and 43B may be referred to as a back yoke 43. Each of the iron cores 45F and 45B may be referred to as an iron core 45. Each of the buffer members 46F and 46B may be referred to as a buffer member 46. Each of the bearing seats 42R and 42L may be referred to as a bearing seat 42. Each of the coils 12F and 12B may be referred to as a coil 12. Each of the drive magnets 44F and 44B may be referred to as a drive magnet 44. The back yoke 43 and the iron core 45 are specific examples of the “yoke” according to the present invention.

<Common fixed part 6>
<Base member 41>
FIG. 7 is a front view of the VCM unit of the present embodiment. FIG. 7 is a drawing obtained by adding a hidden line to the front view of FIG. 8 to 11 are sectional views of the VCM unit of the present embodiment. FIG. 8 shows a cross-sectional view taken along section line VIII-VIII in FIG. FIG. 9 is a cross-sectional view taken along section line IX-IX in FIG. FIG. 10 shows a cross-sectional view taken along section line XX of FIG. FIG. 11 is a sectional view taken along section line XI-XI in FIG.

  As mainly shown in FIGS. 6 and 8 to 11, the base member 41 is configured to include a magnet storage part 41a, a shaft support part 41b, and sheet storage parts 41hR and 41hL. In the present embodiment, the base member 41 is formed of, for example, resin or metal, and is fixed to the main body of the electronic device. More specifically, the magnet storage section 41a is a member having a substantially rectangular cross section extending parallel to the z-axis. A U-shaped groove 41g opened on the y-axis + side is formed on the surface of the magnet storage portion 41a on the y-axis + side in parallel with the z-axis. Protrusions 41d and 41e are provided on the bottom surface of the groove 41g to protrude toward the positive side of the y-axis. The protrusion 41e is located substantially at the center of the bottom surface of the groove 41g. The convex portion 41d is located at a position spaced at a predetermined distance from the convex portion 41e to the positive side of the z axis. A dedicated fixing portion 5F can be stored between the convex portion 41d and the convex portion 41e. A dedicated fixing portion 5B can be stored between the convex portion 41e and the end of the base member 41 on the −z-axis side.

  The sheet storage portions 41hR and 41hL are members having a substantially rectangular cross section extending in parallel to the z-axis, and are provided to face each other with the groove 41g interposed therebetween on the y-axis + side of the magnet storage portion 41a. Concave portions 41fR and 41fL extending parallel to the z-axis are provided on the surfaces on the y-axis + side of the sheet storage portions 41hR and 41hL, respectively. The bearing seats 42R and 42L can be stored in the recesses 41fR and 41fL, respectively.

  The shaft support portion 41b is provided on the z axis + side with respect to the convex portion 41d, and has a through hole 41c parallel to the z axis. The through hole 41c is located on the y axis + side of the sheet storage units 41hR and 41hL, and the shaft 48 can be inserted therethrough.

<Shaft guide 47>
In the present embodiment, the shaft guide 47 is formed of, for example, resin or metal, and is fixed to the end of the base member 41 on the z-axis side. The shaft guide 47 has a through hole 47c parallel to the z-axis. The through hole 47c is provided at a position on the y-axis + side of the sheet storage units 41hR and 41hL and opposed to the through hole 41c of the base member 41, and the shaft 48 can be inserted therethrough.

<Shaft 48>
The shaft 48 is a columnar member extending along the moving direction of the movable section 3. In the present embodiment, the shaft 48 is a columnar member formed of, for example, resin or metal and extending parallel to the z-axis. The shaft 48 is supported by the projection 41d and the shaft guide 47 in parallel with the z-axis by inserting and fixing both ends of the shaft 48 into the through-hole 41c and the through-hole 47c, respectively. That is, the shaft 48 is located on the y axis + side with respect to the sheet storage units 41hR and 41hL, and is parallel to the z axis. The shaft 48 is a specific example of the “columnar portion” in the present invention.

<Bearing seat 42>
The bearing seat 42 is a plate-like member extending along the moving direction of the movable part 3. In the present embodiment, the bearing sheet 42 is a ferromagnetic metal such as iron, for example, and is a plate-like member having a substantially rectangular cross section extending parallel to the z-axis. The bearing seat 42R is fixed to the concave portion 41fR of the seat storage portion 41hR such that the longitudinal direction is parallel to the z-axis direction. The bearing seat 42L is fixed to the concave portion 41fL of the seat storage portion 41hL such that the longitudinal direction is parallel to the z-axis direction. In the present embodiment, the bearing sheets 42R and 42L adhere to the concave portions 41fR and 41fL, respectively, by bonding. The bearing sheets 42R, 42L may be insert-molded in the recesses 41fR, 41fL, respectively. In addition, by forming the bearing sheet 42 from a soft material, the same effect as a countermeasure against resonance using a lubricant such as grease can be realized. The bearing sheet 42 is a specific example of the “plate portion”, the “biasing portion”, and the “ferromagnetic material” in the present invention.

<Exclusive fixed part 5>
Since the dedicated fixing portion 5F is the same component as the dedicated fixing portion 5B, here, the dedicated fixing portion 5F will be representatively described, and the description of the dedicated fixing portion 5B will be omitted.

<Exclusive fixed part 5F>
<Back yoke 43F>
In the present embodiment, the back yoke 43F is a ferromagnetic metal such as iron, for example, and includes a main plate 43Fa, a side plate 43Fb, and a side plate 43Fd. The main plate portion 43Fa is a plate-like member having a substantially rectangular cross section, and has a first surface facing the y axis + side and a second surface facing the y axis-side. The side plate portion 43Fb is a plate-shaped member provided on the z-axis + side of the main plate portion 43Fa and extending on the y-axis + side. A U-shaped groove 43Fc opened on the y-axis + side is formed parallel to the z-axis at the end on the y-axis + side of the side plate portion 43Fb. The side plate portion 43Fd is a plate-like member provided on the z-axis minus side of the main plate portion 43Fa and extending on the y-axis plus side. A U-shaped groove 43Fe that opens on the y-axis + side is formed parallel to the z-axis at the end on the y-axis + side of the side plate portion 43Fd.

<Iron core 45F>
In the present embodiment, the iron core 45F is a member formed of iron, and includes a main plate portion 45Fa and fitting portions 45Fb and 45Fc. The main plate portion 45Fa is a plate-like member having a substantially rectangular cross section and extending parallel to the z-axis. The fitting portion 45Fb is a plate-like member extending from the end of the main plate portion 45Fa on the z axis + side to the z axis + side, and can be fitted with the groove 43Fc in the side plate portion 43Fb of the back yoke 43F. The fitting portion 45Fc is a plate-shaped member extending from the z-axis-side end of the main plate portion 45Fa to the z-axis-side, and can be fitted with the groove 43Fe in the side plate portion 43Fd of the back yoke 43F. Note that the iron core 45F does not necessarily need to be formed of pure iron, and may be formed of an alloy or a magnetic material other than iron.

<Drive magnet 44F>
In the present embodiment, the drive magnet 44F is, for example, a plate-shaped permanent magnet magnetized in the y-axis direction, and has a first surface facing the y-axis plus side and a second surface facing the y-axis minus side. And The first surface and the second surface are magnetized to N and S poles, respectively. Note that the first surface and the second surface may be magnetized to the S magnetic pole and the N magnetic pole, respectively. The drive magnet 44 is a specific example of the “second permanent magnet” in the present invention.

<Buffer 46F>
In the present embodiment, the buffer member 46F is, for example, a plate-like elastic body having a substantially rectangular cross section, and a long hole 46Fa extending in the x-axis direction is formed substantially at the center. In the present embodiment, the buffer member 46F is formed of, for example, a rubber sheet. The buffer member 46F may be formed of an elastic body such as a gel, an elastomer (rubber-like elastic body), or the like. The long hole 46Fa can penetrate the main plate portion 45Fa of the iron core 45F.

<Movable part 3>
As mainly shown in FIG. 6, the movable portion 3F includes a drive frame 11F, a detection magnet 13F, and suction magnets 14FR and 14FL. The movable section 3B includes a drive frame 11B, a detection magnet 13B, and suction magnets 14BR and 14BL.

  Hereinafter, each of the drive frames 11F and 11B may be referred to as a drive frame 11. Each of the detection magnets 13F and 13B may be referred to as a detection magnet 13. Each of the attraction magnets 14FR, 14FL, 14BR, 14BL may be referred to as an attraction magnet 14.

  The movable section 3 is movable with respect to the fixed section 7 and holds the lens barrel. Specifically, the drive frames 11F and 11B can move in parallel to the z-axis with respect to the fixed portion 7, and are provided to face each other.

<Drive frame 11>
Since the drive frame 11F is the same component as the drive frame 11B, here, the drive frame 11F will be representatively described, and the description of the drive frame 11B will be omitted.
<Drive frame 11F>
As mainly shown in FIGS. 6 to 11, the drive frame 11F includes a frame plate portion 11Fa, outer support portions 11Fb and 11Fc, central support portions 11Fd and 11Fe, projecting portions 11Ff and 11Fg, a coil bobbin portion 11Fp, and a concave portion. 11Fl and 11Fm. In the present embodiment, the drive frame 11F is formed of, for example, resin or metal.

<Frame plate portion 11Fa>
The frame plate portion 11Fa has a shape that is symmetric with respect to a symmetric plane (not shown) that is a plane passing through the center of the shaft 48 and parallel to the yz plane. Specifically, the frame plate portion 11Fa is a plate-like member extending in the y-axis direction, and has a first surface facing the z-axis + side and a second surface facing the z-axis-side. In the frame plate portion 11Fa, the lens housing hole 11Fn and the long hole 11Fo are formed in this order from the y axis + side to the y axis-side when the first surface is viewed from the z axis + side (FIGS. 10 and 11). reference). The lens housing hole 11Fn is located on the y axis + side with respect to the shaft 48, and is a through hole that is long in the y axis direction. The lens housing hole 11Fn can house a lens barrel. The elongated hole 11Fo is a through hole that extends in the direction in which the movable portion 3F is biased, that is, the y-axis direction, and through which the shaft 48 can be inserted. In the elongated hole 11Fo, the diameter in the x-axis direction is larger than the diameter of the shaft 48 by a predetermined tolerance, and the diameter in the y-axis direction is larger than the diameter in the x-axis direction. That is, since a gap is formed in the y-axis direction when the shaft 48 is inserted into the elongated hole 11Fo, the frame plate portion 11Fa can be moved by the gap in the y-axis direction. The inner surface of the elongated hole 11 </ b> Fo is a specific example of the “opposing portion” in the present invention.

  In this embodiment, the configuration in which the long hole 11Fo is formed in the frame plate portion 11Fa has been described, but a configuration in which a through hole having a substantially circular cross section is formed in the frame plate portion 11Fa may be used. In this case, the inner surface of the through hole faces the shaft 48. For example, when the diameter of the through hole is slightly larger than the outer diameter of the shaft 48, the through hole guides the drive frame 11F in the movement direction while restricting the movement of the drive frame 11F in a direction orthogonal to the movement direction. The drive frame 11F can be slid along the shaft 48. In this case, a configuration may be adopted in which one of the through hole and the shaft 48 and a sliding portion 4F described later slides mainly, and the other slides auxiliary. Further, for example, when the diameter of the through hole is sufficiently larger than the outer diameter of the shaft 48, the impact when the VCM unit 1 drops is reduced. Further, in the frame plate portion 11Fa, a groove having a V-shaped or U-shaped cross section may be formed instead of the through hole. In this case, the surface forming the groove faces the shaft 48. Further, by forming the groove, the space in the frame plate portion 11Fa can be saved.

<Coil bobbin part 11Fp>
The coil bobbin portion 11Fp is located on the y-axis side with respect to the elongated hole 11Fo (see FIGS. 8 and 10). The coil bobbin portion 11Fp is a cylindrical member that protrudes from the first surface of the frame plate portion 11Fa toward the + z axis and has a long hole 11Fq. The long hole 11Fq is a through hole extending in the x-axis direction and capable of passing through the main plate portion 45Fa of the iron core 45F.

<Outside support 11Fc>
The outer supporting portion 11Fc is a quadrangular prism-shaped member extending from the first surface of the frame plate portion 11Fa toward the + z-axis side, and is located on the + x-axis side with respect to the coil 12F and the shaft 48. On the surface on the y-axis side of the outer support portion 11Fc, an inverted V-shaped groove 11Fi opened on the y-axis side is formed parallel to the z-axis (see FIGS. 7, 9 and 10). The length of the groove 11Fi in the z-axis direction is larger than the diameter of the ball bearing 31F. The width of the opening of the groove 11Fi in the y-axis direction is smaller than the diameter of the ball bearing 31F. The outer support portion 11Fc is supported by the ball bearing 31F by fitting a part of the ball bearing 31F on the y-axis + side into the groove portion 11Fi.

<Outside support 11Fb>
The outer support 11Fb is a member passing through the center of the shaft 48 and symmetric with the outer support 11Fc with respect to a symmetry plane (not shown) parallel to the yz plane. Specifically, the outer supporting portion 11Fb is a quadrangular prism-shaped member extending from the first surface of the frame plate portion 11Fa toward the + z axis, and is located on the x axis − side with respect to the coil 12F and the shaft 48. On the y-axis-side surface of the outer support portion 11Fb, an inverted V-shaped groove 11Fh opened on the y-axis side is formed parallel to the z-axis (see FIGS. 7 and 10). The length of the groove 11Fh in the z-axis direction is larger than the diameter of the ball bearing 31F. The width of the opening of the groove 11Fh in the y-axis direction is smaller than the diameter of the ball bearing 31F. The outer support portion 11Fb is supported by the ball bearing 31F by fitting a part of the ball bearing 31F on the y-axis + side into the groove portion 11Fh.

<Center support 11Fe>
The center-side support portion 11Fe is a quadrangular prism-shaped member extending from the second surface of the frame plate portion 11Fa toward the negative z-axis. The cross-sectional shape of the central supporting portion 11Fe is substantially the same as the cross-sectional shape of the outer supporting portion 11Fc. On the surface on the y-axis side of the center-side support portion 11Fe, an inverted V-shaped groove 11Fk opened on the y-axis side is formed parallel to the z-axis (see FIGS. 7 and 9). The length of the groove 11Fk in the z-axis direction is larger than the diameter of the ball bearing 31F. The width of the opening of the groove 11Fk in the y-axis direction is smaller than the diameter of the ball bearing 31F. The center supporting portion 11Fe is supported by the ball bearing 31F by fitting a part of the ball bearing 31F on the y-axis + side into the groove portion 11Fk.

<Center support 11Fd>
The center support 11Fd is a member passing through the center of the shaft 48 and symmetric with the center support 11Fe with respect to a symmetry plane (not shown) parallel to the yz plane. Specifically, the center-side support portion 11Fd is a quadrangular prism-shaped member extending from the second surface of the frame plate portion 11Fa toward the negative z-axis. The cross-sectional shape of the central support 11Fd is substantially the same as the cross-sectional shape of the outer support 11Fb. On the y-axis-side surface of the center-side support portion 11Fd, an inverted V-shaped groove 11Fj opened on the y-axis-side is formed parallel to the z-axis (see FIG. 7). The length of the groove 11Fj in the z-axis direction is larger than the diameter of the ball bearing 31F. The width of the opening of the groove 11Fj in the y-axis direction is smaller than the diameter of the ball bearing 31F. The center-side support portion 11Fd is supported by the ball bearing 31F by fitting a part of the ball bearing 31F on the y-axis + side into the groove portion 11Fk.

<Protrusion 11Fg>
The protruding portion 11Fg is a plate-shaped member extending from the outer support portion 11Fc toward the y axis + side on the shaft 48 side of the outer support portion 11Fc. The protrusion 11Fg is located on the x axis + side with respect to the shaft 48 (see FIG. 10).

<Protrusion 11Ff>
The protrusion 11Ff is a member passing through the center of the shaft 48 and being symmetric with the protrusion 11Fg with respect to a symmetric plane (not shown) parallel to the yz plane (see FIG. 10). Specifically, the protruding portion 11Ff is a plate-shaped member extending from the outer support portion 11Fb toward the y axis + side on the shaft 48 side of the outer support portion 11Fb. The protrusion 11Ff is located on the x-axis side with respect to the shaft 48.

<Recess 11Fm>
The recess 11Fm is a hole provided on the y-axis minus side of the drive frame 11F and capable of accommodating a part of the attraction magnet 14FL on the y-axis plus side (see FIGS. 7, 9 and 11). Specifically, the concave portion 11Fm is a substantially rectangular hole provided between the groove portion 11Fi and the groove portion 11Fk and recessed on the y-axis + side.

<Recess 11Fl>
The recess 11F1 is a hole provided on the y-axis minus side of the drive frame 11F and capable of accommodating a part of the attraction magnet 14FR on the y-axis plus side (see FIGS. 7 and 11). Specifically, the concave portion 11Fl is a substantially rectangular hole provided between the groove portion 11Fh and the groove portion 11Fj and recessed on the y-axis + side. The position of the concave portion 11Fl and the position of the concave portion 11Fm are symmetric with respect to a plane passing through the center of the shaft 48 and being parallel to a symmetric plane (not shown) parallel to the yz plane.

<Coil 12F>
In the present embodiment, the coil 12F has an air core portion through which the coil bobbin portion 11Fp of the drive frame 11F can be inserted, and is formed by winding a single wire in a predetermined winding direction (FIG. 8 and FIG. 10). The outer cross section of the coil 12F is substantially rectangular. For example, a self-fusing wire is used as the wire of the coil 12F, and the wires are adhered to each other by heating at the time of manufacturing, and the shape of the coil 12F is maintained.

<Coil 12B>
In the present embodiment, the coil 12B has an air core portion through which the coil bobbin portion 11Bp of the drive frame 11B can be inserted, and is formed by winding a single wire in a predetermined winding direction (see FIG. 8). . The outer cross section of the coil 12B is substantially rectangular. For example, a self-fusing wire is used as the wire of the coil 12B, and the wires are adhered to each other by heating at the time of manufacturing, and the shape of the coil 12B is maintained.

<Detection magnet 13F>
In the present embodiment, the detection magnet 13F is a plate-like permanent magnet magnetized in the x-axis direction, and has a first surface facing the x-axis side, a second surface facing the x-axis + side, Having. The first surface and the second surface are magnetized to N and S poles, respectively. Note that the first surface and the second surface may be magnetized to the S magnetic pole and the N magnetic pole, respectively. The detection magnet 13F is attached to a surface on the y-axis + side of the outer support portion 11Fb in the drive frame 11F. At this time, the second surface of the detection magnet 13F is in close contact with the surface on the x-axis side of the protrusion 11Ff, and the surface on the z-axis side of the detection magnet 13F is in close contact with the first surface of the frame plate portion 11Fa.

<Detection magnet 13B>
In the present embodiment, the detection magnet 13B is a plate-shaped permanent magnet magnetized in the x-axis direction, and has a first surface facing the x-axis negative side, a second surface facing the x-axis positive side, Having. The first surface and the second surface are magnetized to N and S poles, respectively. Note that the first surface and the second surface may be magnetized to the S magnetic pole and the N magnetic pole, respectively. The detection magnet 13B is attached to a surface on the y-axis + side of the outer support portion 11Bc in the drive frame 11B. At this time, the second surface of the detection magnet 13B is in close contact with the surface on the x-axis side of the protruding portion 11Bg, and the surface on the + z-axis side of the detection magnet 13B is in close contact with the first surface of the frame plate portion 11Ba.

<Attraction magnet 14>
Since the attraction magnet 14FL is the same component as the attraction magnets 14FR, 14BL, 14BR, here, the attraction magnet 14FL will be representatively described, and description of the attraction magnets 14FR, 14BL, 14BR will be omitted. In the present embodiment, the attraction magnet 14FL is a plate-like permanent magnet magnetized in the y-axis direction, and has a first surface facing the y-axis + side, a second surface facing the y-axis-side, Having. The first surface and the second surface are magnetized to N and S poles, respectively. Note that the first surface and the second surface may be magnetized to the S magnetic pole and the N magnetic pole, respectively. The attraction magnet 14 is a specific example of the “biasing section” and the “first permanent magnet” in the present invention.

<Sliding part 4>
The sliding portion 4F includes four ball bearings 31F. The sliding portion 4B includes four ball bearings 31B. Hereinafter, each of the ball bearings 31F and 31B may be referred to as a bearing 31. Since the sliding portion 4F is the same component as the sliding portion 4B, here, the sliding portion 4F will be representatively described, and the description of the sliding portion 4B will be omitted.

<Sliding part 4F>
The sliding portion 4F slides the movable portion 3F with respect to the fixed portion 7. In the present embodiment, the ball bearing 31F is, for example, a spherical metal whose surface is coated with a lubricant. Four ball bearings 31F are provided between the bearing sheet 42R and the groove 11Fh, between the bearing sheet 42R and the groove 11Fj, between the bearing sheet 42L and the groove 11Fi, and between the bearing sheet 42L and the groove 11Fk, respectively. By rolling, the movable portion 3F is smoothly moved with respect to the fixed portion 7 while being supported. The lubricant does not have to be applied to the surface of the ball bearing 31F. In addition, for example, the ball bearing 31F, the bearing sheet 42, and the shaft 48 may be subjected to a surface treatment such as lubrication painting, plating, or a coating film, and a solid lubrication film may be formed on these surfaces. Ball bearing 31F may be formed of ceramic or resin.

<FPC49>
As mainly shown in FIGS. 3 to 6, the FPC 49 is configured to include two Hall sensors 50F and two Hall sensors 50B. The FPC 49 is provided on the x-axis side of the drive frame 11 and is a flexible board on which electronic components including two Hall sensors 50F and two Hall sensors 50B are mounted. Specifically, the FPC 49 is attached to the surface on the x-axis side of the sheet storage unit 41hR. The two Hall sensors 50F are provided so as to face the first surface of the detection magnet 13F. Each Hall sensor 50F detects the magnetic flux density and outputs a signal indicating the detection result to the FPC 49. When the detection magnet 13F changes its position due to the movement of the drive frame 11F in the z-axis direction, the magnetic flux density in the Hall sensor 50F changes. Therefore, based on the signal output from the Hall sensor 50F, the position of the drive frame 11F in the z-axis direction is changed. Can be detected.

  The two Hall sensors 50B are provided so as to face the first surface of the detection magnet 13B. Hall sensor 50B detects the magnetic flux density and outputs a signal indicating the detection result to FPC 49. When the detection magnet 13B changes its position due to the movement of the drive frame 11B in the z-axis direction, the magnetic flux density in the Hall sensor 50B changes. Therefore, the position of the drive frame 11B in the z-axis direction is determined based on the signal output from the Hall sensor 50B. Can be detected. In the present embodiment, a configuration in which two Hall sensors 50B are provided has been described, but a configuration in which one Hall sensor 50B is provided may be employed. Further, the configuration may be such that two Hall sensors 50B are included in one package.

  In the FPC 49, electric signals acquired by the two Hall sensors 50F and the two Hall sensors 50B are subjected to predetermined electric processing or signal processing by electronic components mounted on the FPC 49, so that the drive frames 11F and 11B Position information indicating the position is generated.

<Overall configuration of VCM unit 1>
As shown mainly in FIGS. 6, 8, and 10, the coil 12F is fixed to the drive frame 11F. More specifically, the coil 12F has, for example, an air core inserted into the coil bobbin 11Fp from the + z-axis side so that the winding direction is a predetermined direction, and is bonded to the first surface of the frame plate 11Fa. . Similarly, the coil 12B is fixed to the drive frame 11B. Specifically, the coil 12B has, for example, an air core inserted into the coil bobbin 11Bp from the z-axis side so that the winding direction is a predetermined direction, and is bonded to the first surface of the frame plate 11Ba. .

  As mainly shown in FIGS. 6, 7, 9 and 11, the attraction magnets 14FR and 14FL are mounted on the drive frame 11F by being accommodated in the recesses 11Fl and 11Fm, respectively, on the y-axis + side. Fixed. Similarly, the attraction magnets 14BR and 14BL are fixed to the drive frame 11B by being partially accommodated in the recesses 11Bm and 11Bl, respectively, on the y-axis + side.

  As shown mainly in FIGS. 6, 8, and 10, the iron core 45F is inserted into the long hole 46Fa of the buffer member 46F and the long hole 11Fq of the coil bobbin portion 11Fp. That is, the iron core 45F is inserted through the coil 12F. At this time, the buffer member 46F is located on the z axis + side with respect to the coil bobbin portion 11Fp. The fitting portions 45Fb and 45Fc of the iron core 45F are welded after being fitted into the grooves 43Fc and 43Fe, respectively. In this state, the main plate portion 43Fa, the side plate portion 43Fb, the iron core 45F, and the side plate portion 43Fd form an annular yoke that forms a magnetically closed circuit. The drive magnet 44F is fixed to the inner peripheral surface of the annular yoke. Specifically, the drive magnet 44F is fixed to the back yoke 43F such that the second surface and the first surface of the main plate portion 43Fa of the back yoke 43F are in close contact with each other. The drive frame 11F can move in the z-axis direction while the movement in the x-axis direction and the movement in the y-axis direction are restricted by the iron core 45F and the long hole 11Fq.

  Similarly, the iron core 45B is inserted into the long hole 46Ba of the buffer member 46B and the long hole 11Bq of the coil bobbin portion 11Bp. That is, the iron core 45B is inserted through the coil 12B. At this time, the buffer member 46B is located on the z-axis side with respect to the coil bobbin portion 11Bp. The fitting portions 45Bb, 45Bc of the iron core 45B are welded after being fitted into the grooves 43Bc, 43Be, respectively. In this state, the main plate portion 43Ba, the side plate portion 43Bb, the iron core 45B, and the side plate portion 43Bd form an annular yoke serving as a magnetically closed circuit. The drive magnet 44B is fixed to the inner peripheral surface of the annular yoke. Specifically, the drive magnet 44B is fixed to the back yoke 43B such that the second surface and the first surface of the main plate portion 43Ba of the back yoke 43B are in close contact with each other. The drive frame 11B can move in the z-axis direction while the movement in the x-axis direction and the movement in the y-axis direction are restricted by the iron core 45B and the elongated hole 11Bq.

  As shown mainly in FIGS. 1, 6, 9 and 10, the shaft guide 47 is fixed to the end on the z-axis side of the base member 41 in a state where the through holes 41c and the through holes 47c face each other. Is done. The dedicated fixing section 5F is fixed to the shared fixing section 6. More specifically, the second surface of the main plate portion 43Fa of the dedicated fixing portion 5F is connected to the base member 41 in a state where the second surface of the frame plate portion 11Fa and the surface on the + z axis side of the shaft guide 47 face each other. It is bonded to the bottom surface of the groove 41g between the protrusion 41d and the protrusion 41e. At this time, the four ball bearings 31F are provided between the bearing sheet 42R and the groove 11Fh, between the bearing sheet 42R and the groove 11Fj, between the bearing sheet 42L and the groove 11Fi, and between the bearing sheet 42L and the groove 11Fk. Are provided respectively. In this state, the drive frame 11F is moved toward the y-axis side by the magnetic attraction between the attraction magnet 14FL and the bearing sheet 42L and the magnetic attraction between the attraction magnet 14FR and the bearing sheet 42R. Be energized. This allows the drive frame 11F to be stably supported by the four ball bearings 31F and to move smoothly in the z-axis direction.

  Similarly, the dedicated fixing part 5B is fixed to the common fixing part 6. More specifically, the second surface of the main plate portion 43Ba of the dedicated fixing portion 5B is in a state where the second surface of the frame plate portion 11Ba and the surface on the z-axis side of the shaft support portion 41b face each other. Is bonded to the bottom surface of the groove 41g between the convex portion 41e and the shaft guide 47. At this time, the four ball bearings 31B are provided between the bearing sheet 42L and the groove 11Bh, between the bearing sheet 42L and the groove 11Bj, between the bearing sheet 42R and the groove 11Bi, and between the bearing sheet 42R and the groove 11Bk. Are provided respectively. In this state, the drive frame 11B moves toward the y-axis side by the magnetic attraction between the attraction magnet 14BL and the bearing sheet 42L and the magnetic attraction between the attraction magnet 14BR and the bearing sheet 42R. Be energized. Thus, the drive frame 11B can be stably supported by the four ball bearings 31B and can move smoothly in the z-axis direction.

  The shaft 48 is fixed to the shaft support portion 41b and the shaft guide 47 while being inserted through the through hole 41c, the long hole 11Fo, the long hole 11Bo, and the through hole 47c. Thereby, rotation of the drive frames 11F and 11B in the zx plane can be suppressed.

  As mainly shown in FIG. 1 and FIG. 6, by applying a current to the coil 12F, an annular current is generated in the coil 12F. Since the annular current of the coil 12F receives Lorentz force based on the magnetic flux density of the driving magnet 44F, the coil 12F receives a thrust parallel to the z-axis. The direction of the thrust can be switched according to the direction of the ring current. That is, by adjusting the direction and magnitude of the annular current of the coil 12F, the movement of the drive frame 11F in the z-axis direction can be controlled. Since the position of the drive frame 11F in the z-axis direction can be acquired based on the position information, the position of the drive frame 11F in the z-axis direction can be freely controlled.

  Similarly, by applying a current to the coil 12B, an annular current is generated in the coil 12B. Since the annular current of the coil 12B receives Lorentz force based on the magnetic flux density of the driving magnet 44B, the coil 12B receives a thrust parallel to the z-axis. The direction of the thrust can be switched according to the direction of the ring current. That is, by adjusting the direction and magnitude of the annular current of the coil 12B, the movement of the drive frame 11B in the z-axis direction can be controlled. Since the position of the drive frame 11B in the z-axis direction can be acquired based on the position information, the position of the drive frame 11B in the z-axis direction can be freely controlled. In addition, a brush, a spring contact (current-carrying spring), a flexible printed circuit board having flexibility, or the like is used to supply power to the coil 12.

  According to the VCM unit having the above configuration, by using the voice coil motor 8, the movable section 3 can be moved at a high speed, and the movable section 3 can be moved to any position without being limited by the resolution. it can.

<2. Features of the present invention>
When a gear mechanism is provided for the purpose of increasing the resolution of the stepping motor, play may occur due to meshing of the gears. In the VCM unit having the above configuration, the attracting magnets 14FL, FR and the bearing sheets 42L, 42R urge the drive frame 11F to the bearing sheets 42L, 42R via the ball bearings 31F by the magnetic force. 7 can be moved smoothly. Further, since the drive frame 11F and the fixed portion 7 can be urged without physically connecting the drive frame 11F via the attraction magnets 14FL, FR and the bearing sheets 42L, 42R, the attraction magnets 14FL, FR can be urged. In addition, the smooth movement of the drive frame 11F can be prevented from being impaired by the bearing sheets 42L and 42R. Further, by using the magnetic force, even when the moving range of the drive frame 11F is wide, it is possible to uniformly urge the drive frame 11F.

  In the VCM unit having the above configuration, the inner surface of the elongated hole 11Fo is opposed to the shaft 48 extending along the moving direction of the drive frame 11F. Therefore, the drive frame 11F is stably oriented with respect to the direction in which the shaft 48 extends. Can be moved.

  In the VCM unit having the above configuration, the shaft 48 extending along the moving direction of the drive frame 11F is inserted into the elongated hole 11Fo of the drive frame 11F, and the inner surface of the elongated hole 11Fo and the shaft 48 face each other. The movement of the drive frame 11F in the direction orthogonal to the direction can be further restricted. Thus, for example, in a configuration in which the ball bearing 31 is provided between the fixed portion 7 and the drive frame 11F, it is possible to prevent the ball bearing 31 from coming off due to an impact when the VCM unit 1 falls.

  For example, when the movement of the drive frame 11F is restricted in the direction in which the drive frame 11F is urged, a gap may be generated between the ball bearing 31F and the drive frame 11F or the bearing seat 42. In this case, the drive frame 11F, the ball bearing 31F, and the bearing seat 42 do not adhere to each other, and the movement of the drive frame 11F may become unstable. In the VCM unit having the above configuration, since the elongated hole 11Fo extends in the direction in which the drive frame 11F is urged, the restriction on the movement of the drive frame 11F in the direction can be eased. Thereby, the drive frame 11F, the ball bearing 31F, and the bearing seat 42 can be brought into close contact with each other, so that the drive frame 11F can be moved stably. Further, for example, by reducing the difference between the short axis of the long hole 11Fo and the outer diameter of the shaft 48, the rotation of the drive frame 11F having the long axis of the long hole 11Fo as the rotation axis can be used to rotate the drive frame 11F between the long hole 11Fo and the shaft 48. It can be suppressed by contact. Further, the assemblability of the VCM unit 1 can be improved.

  In the VCM unit having the above configuration, since the sliding portion is the ball bearing 31F, the friction during driving can be reduced, so that the power consumption of the VCM unit 1 can be reduced. Further, since the difference between the static friction and the dynamic friction can be reduced, the difference between the force required to start the movement and the force required while moving can be reduced. Thereby, the responsiveness of the drive frame 11F can be improved.

  In the VCM unit having the above-described configuration, the bearing sheet 42 comes into contact with the ball bearing 31F and extends in the moving direction of the drive frame 11F. Therefore, the ball bearing 31F is rolled along the bearing sheet 42 with a simple configuration. Can be moved stably and smoothly. In addition, it is possible to suppress the deformation of the bearing surface of the ball bearing 31F due to the impact at the time of dropping, and it is possible to reduce the wear of the bearing surface and improve the durability. Further, by rolling the two ball bearings 31F for each bearing seat 42, the two ball bearings 31F can be supported on the same plane.

  Since the VCM unit having the above-described configuration includes the drive frames 11F and 11B, the two lens barrels can be moved independently of each other, so that a zoom mechanism and an autofocus mechanism in the electronic device can be satisfactorily realized.

  In the VCM unit having the above configuration, the suction magnets 14FL, FR are provided on the drive frame 11F and the bearing sheets 42L, 42R are provided on the fixed portion 7. Therefore, the arrangement configuration of the suction magnets 14FL, FR and the bearing sheets 42L, 42R is effective. Can be simplified. Further, since the drive frame 11F and the fixed portion 7 can be urged without physically connecting the drive frame 11F via the attraction magnets 14FL, FR and the bearing sheets 42L, 42R, the attraction magnets 14FL, FR can be urged. In addition, the smooth movement of the drive frame 11F can be prevented from being impaired by the bearing sheets 42L and 42R. Further, by using the magnetic force, even when the moving range of the drive frame 11F is wide, it is possible to uniformly urge the drive frame 11F.

  In the VCM unit having the above-described configuration, the bearing sheets 42L and 42R come into contact with the ball bearings 31F and extend along the moving direction of the drive frame 11F, and the attraction magnets 14FL and FR are provided on the drive frame 11F. , 42R, the drive frame 11F is urged toward the fixed portion 7 by the attraction force. This makes it possible to easily realize a configuration in which the drive frame 11 </ b> F is urged toward the fixed portion 7.

  In the VCM unit having the above configuration, the back yoke 43 and the iron core 45 form an annular yoke, the coil 12F is inserted into the annular yoke and provided on the drive frame 11F, and the drive magnet 44F is connected to the inner periphery of the annular yoke. It is fixed to the surface, that is, the first surface of the main plate portion 43Fa. Thus, by applying a current to the coil 12F, a propulsive force along the circumferential direction of the annular yoke can be applied to the coil 12F, so that the drive frame 11F can be moved at high speed and stably.

<3. Supplementary items>
The specific description of the embodiment of the present invention has been given above. The above description is merely an example of the embodiment, and the scope of the present invention is not limited to this embodiment, but is widely interpreted to a range that can be understood by those skilled in the art.

  In the drive device of the present embodiment, the configuration in which the lens is a specific example of the “optical member” has been described. However, a configuration in which a mirror or the like is a specific example of the “optical member” may be employed.

  Further, the configuration in which the driving device of the present embodiment includes two movable portions 3 has been described, but the driving device may have a configuration including one or three or more movable portions 3.

  Further, in the driving device of the present embodiment, the configuration in which the dedicated fixed portions 5F and 5B respectively corresponding to the movable portions 3F and 3B are provided, but the movable portions 3F and 3B share one dedicated fixed portion 5. It may be a configuration.

  Further, in the driving device of the present embodiment, the configuration in which the movable portions 3F and 3B share the shared fixed portion 6 has been described. However, the shared fixed portion 6 corresponding to each of the movable portions 3F and 3B is provided. Is also good. Specifically, in the drive device, for example, two sets of bearing seats 42L and 42R (hereinafter, may be referred to as seat sets) may be provided corresponding to each of the movable parts 3F and 3B. . However, when the movable units 3F and 3B share one sheet set, the ball bearings 31F and 31B can be rolled on the same surface, and thus the tilt management of the two lens barrels can be easily performed. Therefore, it is preferable that the movable portions 3F and 3B share one sheet set. In the driving device, for example, two shafts 48 may be provided corresponding to each of the movable parts 3F and 3B. However, when the movable portions 3F and 3B share one shaft 48, the drive frames 11F and 11B can be moved along the same axis, so that the optical axes of the two lens barrels can be easily managed. . Therefore, it is preferable that the movable parts 3F and 3B share one shaft 48.

  In the driving device of the present embodiment, the configuration in which the ball bearing 31 is a specific example of the “sliding portion” has been described. However, a roller with a shaft or the like is a specific example of the “sliding portion”. You may. Specifically, for example, by providing a plurality of shaft-equipped rollers having rotation axes parallel to the x-axis in the sheet storage units 41hL and 41hR, it is possible to realize smooth movement of the drive frame 11F due to rotation of the rollers. .

  In the driving device of the present embodiment, the configuration of the moving coil type driving device in which the coil 12 is provided on the movable portion 3 and the driving magnet 44 is provided on the fixed portion 7 has been described. The moving magnet type driving device provided with the driving magnet 44 in the movable portion 3 may be provided.

  Further, in the drive device of the present embodiment, a configuration has been described in which the movable portion 3 is biased toward the fixed portion 7 by the magnetic force via the sliding portion 4, but the movable portion 3 is slid by the restoring force of a spring or the like. It may be configured to urge the fixing portion 7 via the portion 4. In this case, for example, the through holes 41 c and 47 c are elongated holes extending in the y-axis direction, and a coil spring is provided between the shaft 48 and the base member 41. Thus, the elongated hole 11Fo of the drive frame 11F is urged toward the negative side of the y-axis by the shaft 48, so that the drive frame 11F can be urged to the fixed portion 7 via the ball bearing 31F.

  Further, in the driving device of the present embodiment, the configuration has been described in which the attracting magnet 14 and the bearing sheet 42 functioning as the urging unit are provided in the movable unit 3 and the fixed unit 7, respectively. A configuration in which ferromagnetic materials are provided in the fixed unit 7 and the movable unit 3 respectively may be used.

  Further, in the driving device of the present embodiment, the configuration has been described in which the movable portion 3 is biased to the fixed portion 7 by using a magnetic force as the biasing portion. It may be configured to urge the power.

  Further, in the driving device of the present embodiment, the first elastic body that urges the movable part 3F and the movable part 3B toward the z-axis side between the movable part 3F and the shaft support part 41b, or the movable part 3B and the shaft A second elastic body may be provided between the guide 47 and the movable portion 3F and the movable portion 3B to urge the movable portion 3F and the movable portion 3B in the positive z-axis direction. The first elastic body and the second elastic body are, for example, coil springs, and the shaft 48 is inserted through their centers. Thus, for example, the coil 12F or 12B can be brought into contact with the shaft support portion 41b or the shaft guide 47 in a state where the coil 12 is not energized. Thus, it is possible to prevent the drive frames 11F and 11B from moving inadvertently due to the external force applied to the drive device and causing the drive frames 11 to collide with each other.

  Further, in the drive device of the present embodiment, both the first elastic body and the second elastic body may be provided. Thus, for example, in a state in which the coil 12 is not energized, the drive frames 11F and 11B in contact with each other can be positioned substantially at the center of the shaft 48. Thus, it is possible to prevent the drive frames 11F and 11B from moving inadvertently due to the external force applied to the drive device and causing the drive frames 11 to collide with each other.

  Further, in the driving device of the present embodiment, a third elastic body is provided between the movable part 3F and the movable part 3B to urge the movable part 3F and the movable part 3B in opposite directions along the optical axis direction. You may be. The third elastic body is, for example, a coil spring, and the shaft 48 is inserted through the center thereof. This allows the coils 12F and 12B to abut against the buffer members 46F and 46B, respectively, for example, in a state where power is not supplied to the coil 12, so that the drive frames 11F and 11B are exposed by external force applied to the drive device. It is possible to prevent the drive frames 11 from moving and colliding with each other.

  INDUSTRIAL APPLICABILITY The present invention is suitably used as a driving device for driving an optical member such as a lens in a digital camera, a smartphone, or a projector.

1 VCM units 3F, 3B Moving parts 4F, 4B Sliding parts 5F, 5B Dedicated fixing parts 6 Shared fixing parts 7 Fixed parts 8F, 8B Voice coil motors 11F, 11B Driving frames 11Fa, 11Ba Frame plate portions 11Fb to 11Fc, 11Bb to 11Bc ... outer support portions 11Fd to 11Fe, 11Bd to 11Be ... central support portions 11Ff to 11Fg, 11Bf to 11Bg ... projecting portions 11Fh to 11Fk, 11Bh to 11Bk ... groove portions 11Fl to 11Fm, 11Bl 11Bm: concave portion 11Fn, 11Bn: lens housing hole 11F, 11Bo: long hole 11Fp, 11Bp: coil bobbin portion 11Fq, 11Bq: long hole 12F, 12B: coil 13F, 13B: detecting magnets 14FR, 14FL, 14BR, 14BL: attracting magnet 31F, 31B… Ball bear Ring 41: Base member 41a: Magnet storage part 41b: Shaft support part 41c: Through hole 41d-41e: Convex part 41fR, 41fL: Depression 41g: Groove 41hR, 41hL: Seat storage parts 42R, 42L: Bearing seats 43F, 43B ... Back yoke 43Fa, 43Ba: Main plate portion 43Fb, 43Fd, 43Bb, 43Bd: Side plate portion 43Fc, 43Fe, 43Bc, 43Be: Groove 44F, 44B: Drive magnet 45F, 45B: Iron core 45Fa, 45Ba: Main plate portion: 45Fb to 45Fc, 45Bb to 45Fb 45Bc: fitting portions 46F, 46B: cushioning members 46Fa, 46Ba: long holes 47: shaft guides 47c: through holes 48: shafts 49: FPC
50F, 50B ... Hall sensor

Claims (13)

A fixed part,
A movable part that is movable with respect to the fixed part and holds the optical member,
A sliding portion provided between the movable portion and the fixed portion,
A voice coil motor that moves the movable part with respect to the fixed part,
The movable portion is biased by the fixed portion,
Drive. The movable unit further includes an urging unit that urges the fixed unit via the sliding unit by magnetic force.
The drive device according to claim 1. The fixed portion includes a columnar portion extending along a moving direction of the movable portion,
The movable portion has an opposing portion facing the columnar portion,
The drive device according to claim 1 or 2. The movable portion has a through hole through which the columnar portion is inserted,
The facing portion is an inner surface of the through hole,
The driving device according to claim 3. The through hole is a long hole extending in a direction in which the movable portion is urged,
The driving device according to claim 4. The sliding portion is a ball bearing;
The drive device according to any one of claims 1 to 5. The fixed portion includes a plate portion that is in contact with the ball bearing and extends along a moving direction of the movable portion.
The driving device according to claim 6. The driving device includes a plurality of the movable units,
The drive device according to any one of claims 1 to 7. The urging unit,
A first permanent magnet provided on one of the movable part and the fixed part,
And a ferromagnetic material provided on the other side,
The drive device according to any one of claims 1 to 8. The fixed portion includes a plate portion of the ferromagnetic material that is in contact with the ball bearing and extends along a moving direction of the movable portion.
The first permanent magnet is provided in the movable portion, and urges the movable portion toward the fixed portion by an attractive force generated between the first permanent magnet and the plate portion.
The driving device according to claim 9. The fixing part,
Including an annular yoke,
The voice coil motor,
A coil provided in the movable portion and through which the yoke is inserted;
A second permanent magnet fixed to the inner peripheral surface of the yoke.
The drive device according to any one of claims 1 to 10. A drive device according to any one of claims 1 to 11,
Lens drive. A driving device according to any one of claims 1 to 11, or a lens driving device according to claim 12.
Electronics.

Images