JP2023115126A - Lens barrel and imaging device - Google Patents

Abstract

To achieve miniaturization of a lens barrel or an imaging device in which a driving device is provided.SOLUTION: A driving device comprises: a yoke that extends in an optical axis direction; a movable coil into which the yoke is inserted, and which is anchored to a mobile body and movable in the optical axis direction along the yoke; a pair of magnets that is formed into a plate shape, and located on both sides of the yoke and the movable coil, in which surfaces facing the movable coil are magnetic flux generating surfaces; and an outer yoke that has the magnet attached, is formed into the plate shape, and has a pair of side yoke parts. Let an arrangement direction of the yoke, the pair of magnets and the pair of side yoke parts be made in a peripheral direction of a cylindrical part, one end on a lens side of the magnetic flux generating surface in a radial direction of a lens be on an inner end, and one end on a side opposite the lens be an outside end, a distance between the inner ends in the magnetic flux generating surface of the pair of magnets is made shorter than that between the outside ends, and put in a mutually close state as the pair of side yoke parts gets close to a center of the cylindrical part.SELECTED DRAWING: Figure 6

Description

TECHNICAL FIELD The present technology relates to a technical field of a lens barrel and an image pickup apparatus provided with a driving device that applies a driving force to a moving body having a lens.

Various imaging devices such as video cameras and still cameras are provided with a lens barrel that captures an optical image through a photographic optical system such as a lens, and the lens barrel has a configuration having a plurality of lens groups arranged in the optical axis direction. There are things that are In some cases, the imaging device is not provided with a lens barrel, and an interchangeable lens or the like detachably attached to the imaging device is used as the lens barrel.

Some of such lens barrels have a structure in which a moving body having a lens is moved in the optical axis direction by the driving force of a driving device in order to perform focusing, zooming, or the like.

As a driving device that applies a driving force to a moving body, there is a type that has a magnet, a moving coil, and a yoke, and applies the thrust generated in the magnetic circuit when the moving coil is supplied with current as the driving force to the moving body. (For example, see Patent Document 1, Patent Document 2, and Patent Document 3).

The driving device described in Patent Document 1 has a configuration in which a moving coil is arranged on the outer peripheral side of a guide shaft formed in a round shape for guiding a moving body, and a magnet is arranged on the outer peripheral side of the moving coil. there is

The driving device described in Patent Document 2 has a configuration in which a moving coil is arranged on the outer peripheral side of a yoke formed into a round shaft shape, and a magnet is arranged on the outer peripheral side of the moving coil.

The driving device described in Patent Document 3 has a configuration in which a moving coil is arranged on the outer peripheral side of a yoke, and a pair of magnets are arranged on the opposite side of the yoke and the moving coil.

JP-A-4-30506 JP-A-7-170710 JP 2006-14514 A

However, in the driving devices described in Patent Documents 1 and 2, the moving coil is arranged on the outer peripheral side of the guide shaft or the yoke, and the magnet is arranged on the outer peripheral side of the moving coil. As a result, the lens barrel in which the drive device is arranged and the drive device in the image pickup device tend to be large in size in the radial direction.

Further, in the driving device described in Patent Document 3, the driving force is increased by increasing the thickness of the central yoke. There is a risk that the size of the device will become large and that miniaturization of the lens barrel and imaging device will be hindered.

Therefore, an object of the present technology lens barrel and imaging device is to overcome the above-described problems and reduce the size of the lens barrel and the imaging device in which the driving device is provided.

First, a driving device according to the present technology applies a driving force in an optical axis direction to a moving body having at least one lens and a lens holding frame that holds the lens, and a yoke extending in the optical axis direction. a moving coil through which the yoke is inserted and fixed to the moving body and movable in the optical axis direction along the yoke; and a pair of magnets positioned on both sides of the yoke and the moving coil, The surfaces of the pair of magnets facing the moving coil are magnetic flux generating surfaces, respectively, and the movable body moves in the optical axis direction inside the tubular portion with respect to the tubular portion whose axial direction is the optical axis direction. It is moved so that the yoke and the pair of magnets are aligned in the circumferential direction of the cylindrical portion.

As a result, the movable body is moved in the optical axis direction inside the cylindrical portion, and the yoke and the pair of magnets are aligned in the circumferential direction of the cylindrical portion.

Secondly, in the driving device described above, it is desirable that the cylindrical portion is formed in a substantially cylindrical shape.

Thereby, the yoke and the pair of magnets are positioned side by side in the circumferential direction.

Thirdly, in the driving device described above, when one end of the magnetic flux generating surface on the side of the lens is defined as an inner end and one end opposite to the lens is defined as an outer end in the radial direction of the lens, the pair of magnets is preferably smaller than the distance between the outer ends of the magnetic flux generating surface.

As a result, the pair of magnets are not positioned in parallel, and the ends of the magnets are less likely to protrude outward from the outer periphery of the cylindrical portion.

Fourthly, in the driving device described above, it is desirable that the magnetic flux generating surface is positioned substantially parallel to a virtual plane containing the optical axis.

This makes it even more difficult for the end of the magnet to protrude outward from the outer periphery of the cylindrical portion.

Fifthly, in the driving device described above, it is desirable that the yoke, the moving coil, and the pair of magnets are positioned on the outer periphery of the inner space of the cylindrical portion.

As a result, the yoke, the moving coil, and the pair of magnets are positioned close to the inner peripheral surface of the cylindrical portion.

Sixthly, in the driving device described above, a frame-shaped outer yoke is disposed at a position surrounding the moving coil, and the outer yoke is positioned parallel to a pair of side yoke portions and a pair of bottom portions positioned parallel to each other. The magnets are attached to the pair of side yoke portions, respectively, and both ends of the yoke in the optical axis direction are attached to the pair of bottom yoke portions.

As a result, the outer yoke to which the magnet and the yoke are attached is arranged at a position surrounding the moving coil.

Seventhly, in the above-described driving device, it is desirable that the maximum area of the cross section of the yoke perpendicular to the optical axis is 5% or more of the total area of the magnetic flux generating surfaces of the pair of magnets.

As a result, magnetic saturation is less likely to occur in the relationship between the magnet and the yoke, and reduction in thrust generated in the magnetic circuit is suppressed.

Eighth, in the driving device described above, it is desirable that at least a portion of the cross section of the yoke in the direction perpendicular to the optical axis direction is circular.

This makes it possible to increase the cross-sectional area perpendicular to the optical axis while reducing the outer shape of the yoke.

Ninth, in the driving device described above, it is desirable that the moving coil is formed in a cylindrical shape.

This makes it possible to increase the number of turns while reducing the outer shape of the moving coil.

Tenthly, in the above-described driving device, the lens holding frame is provided with a fixing portion to which the moving coil is fixed by adhesion, and at least a part of the fixing portion is disposed between the pair of magnets and the moving coil. should be located in the space of

As a result, the space for filling the adhesive can be effectively used.

Eleventhly, in the driving device described above, it is desirable that a plurality of the fixed portions be provided, and that the plurality of fixed portions be provided at substantially equal intervals in the circumferential direction of the moving coil.

As a result, the fixed positions of the moving coil with respect to the lens holding frame are dispersed in the circumferential direction.

Twelfth, in the drive device described above, it is desirable that the magnetic flux generating surface is formed in an arcuate shape along the outer peripheral surface of the moving coil.

As a result, the distance between the magnetic flux generating surface and the outer peripheral surface of the moving coil is reduced in the circumferential direction of the moving coil, thereby improving the magnetic flux density.

A lens barrel according to the present technology has a cylindrical portion formed in a cylindrical shape whose axial direction is the optical axis direction, and a lens holding frame that holds at least one lens and the lens. a moving body that moves in the optical axis direction inside the cylindrical portion; a driving device that is positioned on the outer peripheral portion of the inner space of the cylindrical portion and applies a driving force for moving the moving body in the optical axis direction; The driving device includes a guide shaft that guides the moving body in the optical axis direction, and the driving device includes a yoke extending in the optical axis direction, and a yoke through which the yoke is inserted and fixed to the moving body, and moves in the optical axis direction along the yoke. a movable coil; a pair of plate-shaped magnets positioned on both sides of the yoke and the moving coil, the surfaces facing the moving coil being magnetic flux generating surfaces; and plates to which the magnets are attached. an outer yoke having a pair of side yoke portions formed in a shape, wherein the yoke, the pair of magnets, and the pair of side yoke portions are aligned in the circumferential direction of the cylindrical portion; The distance between the inner ends of the magnetic flux generating surfaces of the pair of magnets is the above The distance between the outer ends is smaller than the distance between the outer ends, and the pair of side yoke portions approach each other as they approach the center of the cylindrical portion.

As a result, the movable body is moved in the optical axis direction inside the cylindrical portion, and the yoke and the pair of magnets are aligned in the circumferential direction of the cylindrical portion.

Fourteenthly, in the above-described lens barrel, it is desirable that two driving devices are provided, and the two driving devices are positioned on substantially opposite sides of the lens.

As a result, an unnecessary moment is less likely to occur in the moving body.

Fifteenth, in the lens barrel described above, two guide shafts for guiding the moving body in the optical axis direction are provided, and the two guide shafts are located on substantially opposite sides of the lens. desirable.

As a result, the movable body is guided by two guide shafts positioned substantially opposite to each other with the lens interposed therebetween and moved in the direction of the optical axis. becomes difficult to reach.

Sixteenthly, in the lens barrel described above, one of the guide shafts, one of the driving devices, the other of the guide shafts and the other of the driving devices are arranged in order at substantially equal intervals in the circumferential direction. is desirable.

As a result, the driving devices are positioned substantially on opposite sides of the lens, and one guide shaft and the other guide shaft are positioned between the driving devices in the circumferential direction.

An imaging device according to the present technology includes a lens barrel that captures an optical image and an imaging device that converts the captured optical image into an electrical signal. a moving body having a tubular portion formed in a shape, at least one lens, and a lens holding frame for holding the lens, and moving in the optical axis direction inside the tubular portion; A driving device that is positioned at an outer peripheral portion of the internal space and applies a driving force for moving the moving body in the optical axis direction, and a guide shaft that guides the moving body in the optical axis direction, wherein the driving device is a yoke extending in the direction of the optical axis; a moving coil through which the yoke is inserted and fixed to the moving body so as to be movable in the direction of the optical axis along the yoke; an outer yoke having a pair of side yoke portions formed in a plate-like shape to which the magnets are respectively attached, and a pair of magnets positioned on both sides and having surfaces facing the moving coil as magnetic flux generating surfaces, respectively; The yoke, the pair of magnets, and the pair of side yoke portions are aligned in the circumferential direction of the cylindrical portion, and one end of the magnetic flux generating surface on the lens side in the radial direction of the lens is the inner end of the lens. When one end on the opposite side is defined as an outer end, the distance between the inner ends of the magnetic flux generating surfaces of the pair of magnets is smaller than the distance between the outer ends, and the pair of side yoke portions are cylindrical. They are made to approach each other as they approach the center of the part.

As a result, the movable body is moved in the optical axis direction inside the cylindrical portion, and the yoke and the pair of magnets are aligned in the circumferential direction of the cylindrical portion.

Eighteenthly, in the imaging apparatus described above, it is preferable that two driving devices are provided, and the two driving devices are positioned on substantially opposite sides of the lens.

As a result, an unnecessary moment is less likely to occur in the moving body.

Nineteenthly, in the imaging apparatus described above, it is desirable that two guide shafts for guiding the moving body in the optical axis direction are provided, and that the two guide shafts are positioned on substantially opposite sides of the lens. .

As a result, the movable body is guided by two guide shafts positioned substantially opposite to each other with the lens interposed therebetween and moved in the direction of the optical axis. becomes difficult to reach.

Twentiethly, in the imaging apparatus described above, one of the guide shafts, one of the driving devices, and the other of the guide shafts and the other of the driving devices are arranged at substantially equal intervals in the circumferential direction. is desirable.

As a result, the driving devices are positioned substantially on opposite sides of the lens, and one guide shaft and the other guide shaft are positioned between the driving devices in the circumferential direction.

According to the present technology, the moving body is moved in the optical axis direction inside the cylindrical portion, and the yoke and the pair of magnets are arranged side by side in the circumferential direction of the cylindrical portion. The arrangement space can be effectively used, and the size of the lens barrel in which the driving device is provided and the imaging device can be reduced.

Note that the effects described in this specification are merely examples and are not limited, and other effects may be provided.

FIG. 2 to FIG. 10 show an embodiment of the lens barrel of the present technology and an image pickup device, and this figure is a perspective view of the image pickup device showing the lens barrel and the device main body separated from each other. It is a perspective view of a lens barrel which makes a part and shows a cross section. It is a horizontal sectional view of a lens barrel. It is a vertical sectional view of a lens barrel. It is a perspective view which shows a part of lens holding frame. FIG. 4 is a conceptual diagram showing the positional relationship between a tubular portion and a magnet; FIG. 4 is a conceptual diagram showing an example in which a magnetic flux generating surface of a magnet is positioned on a plane including the optical axis; FIG. 4 is a conceptual diagram showing an example in which a magnet having a magnetic flux generating surface formed in an arcuate shape is used; FIG. 4 is a conceptual diagram showing an example of the arrangement configuration of the driving device when the holding body is formed in a non-circular shape; 1 is a block diagram of an imaging device; FIG.

Embodiments for implementing the present technology will be described below with reference to the accompanying drawings.

In the embodiments shown below, the imaging device of the present technology is applied to a still camera, the lens barrel of the present technology is applied to an interchangeable lens that can be attached to and detached from the body of the still camera, and the driving device of the present technology is applied to this lens. It is applied to the driving device arranged in the lens barrel.

Note that the scope of application of the present technology is not limited to a still camera, an interchangeable lens that can be attached to and detached from the device body of the still camera, and a drive device arranged in the interchangeable lens. For example, the present technology is incorporated in a video camera or other equipment as an imaging device, a lens barrel configured by a lens group or the like provided in these imaging devices, and provided in these various imaging devices. It can be widely applied to a driving device arranged in a lens barrel.

In the following description, the front, back, top, bottom, left, and right directions are shown as viewed from the photographer when shooting with a still camera. Therefore, the subject side is the front side, and the photographer side is the rear side.

Note that the front, rear, up, down, left, and right directions shown below are for convenience of explanation, and implementation of the present technology is not limited to these directions.

In addition, the lens group shown below may include one or more lenses, and other optical elements such as a diaphragm and an iris, in addition to those composed of one or more lenses.

<Structure of Imaging Device>
The imaging device 100 is composed of a device body 200 and a lens barrel 1 (see FIG. 1). The lens barrel 1 is, for example, an interchangeable lens that can be attached to and detached from the apparatus body 200 . Note that the present technology includes a type in which a lens barrel having a structure similar to the internal structure of the lens barrel 1 is incorporated inside the device main body, and a collapsible type in which this lens barrel protrudes or is housed in the device main body. It can also be applied to

The apparatus main body 200 is configured by arranging required parts inside and outside an outer casing 201 .

Various operation units 202, 202, . . . As the operation units 202, 202, .

A display (display unit) (not shown) is arranged on the rear surface of the outer casing 201 .

A circular opening 201a is formed in the front surface of the outer housing 201, and a portion around the opening 201a is provided as a mount portion 203 for mounting the lens barrel 1 thereon.

An imaging element 204 such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) is arranged inside the outer casing 201, and the imaging element 204 is positioned behind the opening 201a.

<Structure of lens barrel>
The lens barrel 1 comprises a substantially cylindrical outer cylinder 2 whose axial direction is oriented forward and backward, and necessary parts mounted or supported inside and outside the outer cylinder 2 (see FIG. 1).

The rear end of the lens barrel 1 is provided with a lens mount 3 that is bayonet-coupled, for example, to the mount section 203 of the apparatus main body 200 . The lens barrel 1 is provided with operation rings 4, 4 functioning as a zoom ring and a focus ring. Manual zooming and manual focusing are performed by rotating the operation rings 4 , 4 .

The lens barrel 1 has, for example, a plurality of lens groups 5, 5, . Note that FIG. 1 shows only the frontmost lens group 5 . The lens groups 5, 5, . . . are spaced apart in the optical axis direction (front-rear direction) and have a movable group that can move in the optical axis direction and a fixed group that cannot move in the optical axis direction. One of the lens groups 5, 5, . . . is provided as a focus lens group that is moved in the optical axis direction for focusing (see FIGS. 2 to 4).

A holder 6 is arranged inside the outer cylinder 2 . The holder 6 has a substantially cylindrical tubular portion 7 whose axial direction is oriented in the front-rear direction, and a substantially annular annular portion 8 attached to the tubular portion 7 .

A first support protrusion 7a that protrudes inward is provided at the rear end of the tubular portion 7 . A second support protrusion 7b that protrudes inward is provided at an intermediate portion of the tubular portion 7 in the front-rear direction. The first supporting protrusion 7a and the second supporting protrusion 7b are provided at substantially opposite sides with the central axis of the cylindrical portion 7 interposed therebetween. The cylindrical portion 7 is formed with an inwardly extending escape recess 7c extending in the front-rear direction, and the escape recess 7c is formed at a position continuous with the first support protrusion 7a. Arrangement recesses 7d and 7d that are open inwardly and forwardly are formed in substantially the front half portion of the cylindrical portion 7, and the arrangement recesses 7d and 7d are positioned substantially on opposite sides of the central axis of the cylindrical portion 7. ing. Sensor placement holes 7e, 7e are formed in the tubular portion 7 at substantially opposite positions across the central axis.

The annular portion 8 is formed with a first mounting hole 8a and a second mounting hole 8b that are open at least rearward. The first mounting hole 8a and the second mounting hole 8b are positioned substantially opposite to each other with the center axis of the annular portion 8 interposed therebetween. The annular portion 8 is formed with a relief recess 8c that opens inwardly and rearwardly, and the relief recess 8c is positioned near the first mounting hole 8a.

The annular portion 8 is attached to the front end of the tubular portion 7 . When the annular portion 8 is attached to the tubular portion, the relief recess 8c formed in the annular portion 8 and the relief recess 7c formed in the tubular portion 7 are continuous in the front and rear (see FIG. 3).

First bearing caps 9, 9 are inserted into and fixed to the first support protrusion 7a of the cylindrical portion 7 and the first support hole 8a of the annular portion 8, respectively. Second bearing caps 10, 10 are inserted into and fixed to the second support protrusion 7b of the cylindrical portion 7 and the second support hole 8b of the annular portion 8, respectively.

Both ends of the first guide shaft 11 in the axial direction are inserted into and fixed to the first bearing caps 9 , 9 . Both axial ends of a second guide shaft 12 are inserted into and fixed to the second bearing caps 10 , 10 .

A movable body 13 is slidably supported by the first guide shaft 11 and the second guide shaft 12, and the movable body 13 is guided by the first guide shaft 11 and the second guide shaft 12 to move in the optical axis direction. (see FIGS. 3 and 4).

The movable body 13 has a lens group 5 and a lens holding frame 14 , and the lens group 5 is held by the lens holding frame 14 . The lens group 5 of the moving body 13 is, for example, the focus lens group described above. The lens group 5 of the moving body 13 is composed of one or more lenses. The lens group 5 of the movable body 13 may be another movable group such as a zoom lens group that is moved in the optical axis direction for zooming.

The lens holding frame 14 has an annular lens holding portion 15, a projecting portion 16 projecting from the lens holding portion 15, and arm portions 17, 17 projecting from the lens holding portion 15 in substantially opposite directions.
The protruding portion 16 protrudes forward and rearward from the outer peripheral portion of the lens holding portion 15, and front and rear end portions thereof are provided as first guided portions 16a, 16a, respectively. The first guide shaft 11 is inserted through the first guided portions 16a, 16a.

A part of the lens holding portion 15 is provided as second guided portions 15a, 15a, and the second guided portions 15a, 15a are separated from each other in the front-rear direction. A second guide shaft 12 is inserted through the second guided portions 15a, 15a.

As described above, the movable body 13 is configured by inserting the first guide shaft 11 through the first guided portions 16a, 16a and inserting the second guide shaft 12 through the second guided portions 15a, 15a. , and supported by a first guide shaft 11 and a second guide shaft 12 to be movable in the optical axis direction.

In a state in which the moving body 13 is supported by the first guide shaft 11 and the second guide shaft 12, a part of the protruding portion 16 having the first guided portions 16a, 16a forms an annular shape with the cylindrical portion 7. It is inserted into relief recesses 7c and 8c respectively formed in the portion 8 (see FIGS. 3 and 4). The thicknesses of portions of the cylindrical portion 7 and the annular portion 8 where the arrangement recesses 7d, 7d and relief recesses 7c, 8c are not formed are substantially constant, and the arrangement recesses 7d, 7d and the relief recesses 7c, 8c are formed. It is thicker than the thickness of the

The arm portions 17 , 17 protrude outward from the lens holding portion 15 and are provided at substantially opposite sides with the central axis of the lens group 5 interposed therebetween.

The arm portion 17 has an annular inserted portion 18 and fixing portions 19, 19 projecting rearward from the outer periphery of the inserted portion 18 (see FIG. 5). The fixing portions 19 , 19 are spaced apart in the circumferential direction, and the fixing portion 19 does not exist at the position of the arm portion 17 that is the most distant from the lens holding portion 15 . The fixed portion 19 is formed with an adhesive concave portion 19a that is open toward the center of the inserted portion 18 and to the rear.

Portions of the lens holding portion 15 where the arm portions 17, 17 protrude are provided as receiving portions 20, 20 (see FIGS. 4 and 5). The receiving portion 20 is formed in an arc shape that is continuous with a part of the outer peripheral portion of the inserted portion 18 , and the rear end thereof is provided as a fixing portion 21 . Therefore, the fixed part 21 is positioned behind the fixed parts 19 , 19 . The fixed portion 21 is formed with an adhesive concave portion 21 a that is open toward the center of the inserted portion 18 and rearward.

The fixed portions 19, 19 and the fixed portion 21 are positioned at approximately equal intervals in the circumferential direction.

Detection magnets 22, 22 are attached to the outer peripheral portion of the lens holding portion 15 (see FIGS. 2 and 4). The detection magnets 22, 22 are positioned substantially opposite to each other across the central axis of the lens group 5, and are formed in a shape extending back and forth.

Magnetic sensors 23, 23 are arranged at positions facing the detection magnets 22, 22, respectively. The magnetic sensors 23, 23 are attached to the tubular portion 7 with at least portions thereof inserted into the sensor arrangement holes 7e, 7e, respectively. A magnetic sensor 23 is mounted on a circuit board 24 .

The magnetic sensors 23, 23 detect the strength of the magnetic fields of the detection magnets 22, 22, which change when the moving body 13 is moved in the optical axis direction, and identify the position of the moving body 13 in the optical axis direction. have

In the above example, two magnetic sensors 23, 23 and two detection magnets 22, 22 are arranged. Optional.

Driving devices 25, 25 are attached to the annular portion 8 of the holder 6 (see FIGS. 2 to 4). The driving device 25 is composed of an outer yoke 26 , a yoke 27 , a moving coil 28 and magnets 29 , 29 .

The outer yoke 26 is formed into a frame shape by joining a pair of side yoke portions 30, 30 and a pair of bottom yoke portions 31, 31 together. The side yoke portion 30 is formed in a substantially rectangular plate shape extending in the front-rear direction. The bottom yoke portion 31 is formed in a plate shape extending in the circumferential direction of the annular portion 8 and curved in a gentle arc shape. The upper and lower ends of the side yoke portions 30, 30 and the left and right ends of the bottom yoke portions 31, 31 are connected to the outer yoke 26, respectively. In the outer yoke 26, as described above, the side yoke portions 30, 30 and the bottom yoke portions 31, 31 may be formed as separate members, or may be partially or wholly integrally formed. .

The yoke 27 is formed in the shape of a round shaft, and the axial direction is the front-rear direction. Therefore, the yoke 27 has a circular cross section in the direction orthogonal to the axial direction. The yoke 27 is positioned between the side yoke portions 30 and 30 with both front and rear end portions respectively coupled to the central portions of the bottom yoke portions 31 , 31 . The yoke 27 is inserted through the inserted portion 18 of the arm portion 17 of the lens holding frame 14 . A part of the yoke 27 may be hollow.

The moving coil 28 is formed in a cylindrical shape. The inner diameter of the moving coil 28 is slightly larger than the outer diameter of the yoke 27 , and the yoke 27 is inserted through the moving coil 28 . The movable coil 28 is fixed to the fixed portions 19 , 19 , 21 by adhesion while the front end surface thereof is in contact with the rear surface of the arm portion 17 of the lens holding frame 14 . The movable coil 28 is fixed to the arm portion 17 by filling the adhesive recesses 19a, 19a, and 21a of the fixed portions 19, 19, and 21 with adhesives 50, 50, and 50, respectively. Therefore, the movable body 13 and the movable coil 28 are moved together in the optical axis direction.

The moving coil 28 has a front end fixed to the fixed parts 19 and 19 and a rear end fixed to the fixed part 21 . Therefore, since the moving coil 28 is fixed to the fixed portions 19, 19, 21 at the front and rear ends, the moving coil 28 can be secured to the lens holding frame 14 stably and firmly. The movable coil 28 may also be fixed to the receiving portions 20, 20 by adhesion while the outer peripheral surface of the moving coil 28 is in surface contact with the outer surfaces of the receiving portions 20, 20. As shown in FIG.

As described above, the moving coil 28 is formed in a cylindrical shape, and the magnets 29, 29 positioned on both sides of the moving coil 28 are formed in a flat plate shape, so that the magnets 29, 29 and the moving coil 28 are separated from each other. creates a space in which at least a part of the fixing parts 19, 19, 21 is located.

Therefore, the space filled with the adhesives 50, 50, 50 can be effectively used, and the moving coil 28 can be fixed to the lens holding frame 14 without increasing the size of the driving device 25. FIG.

In addition, since the fixing portions 19, 19, and 21 are provided at substantially equal intervals in the circumferential direction of the moving coil 28, the fixing positions of the moving coil 28 with respect to the lens holding frame 14 are dispersed in the circumferential direction, A stable and strong fixed state of the movable coil 28 to the lens holding frame 14 can be ensured.

The magnets 29, 29 are formed in a rectangular plate shape whose longitudinal direction is the front-rear direction, and are fixed to the surfaces of the side yoke portions 30, 30 facing the moving coil 28 side, respectively. The magnets 29 , 29 have magnetic flux generating surfaces 29 a, 29 a on the sides facing each other.

In the drive device 25 configured as described above, the magnetic flux generated from the magnetic flux generating surfaces 29a, 29a of the magnets 29, 29 and the current flowing through the moving coil 28 generate a thrust, and the generated thrust serves as a driving force to move the motor. The moving coil 28 and the moving body 13 are moved integrally in the direction corresponding to the direction of the current applied to the coil 28 and flowing through the moving coil 28 . At this time, since the lens holding frame 14 of the moving body 13 is guided by the first guide shaft 11 and the second guide shaft 12, the moving coil 28 and the moving body 13 are moved according to the direction of the current flowing through the moving coil 28. The driving devices 25, 25 are moved forward or backward in the axial direction in the inner space of the cylindrical portion 7. The driving devices 25, 25 are partially inserted into the arrangement recesses 7d, 7d of the cylindrical portion 7, respectively. attached to the One bottom yoke portion 31 of the driving device 25 is attached to the annular portion 8 by adhesion or the like.

When the driving device 25 is attached to the annular portion 8 , the arc-shaped bottom yoke portion 31 is positioned along the outer peripheral edge of the annular portion 8 , and the magnets 29 , 29 extend in the circumferential direction of the tubular portion 7 . are spaced apart from each other. Therefore, the yoke 27 and the pair of magnets 29, 29 are aligned in the circumferential direction S of the cylindrical portion 7 (see FIG. 4).

In the driving device 25, as described above, the bottom yoke portions 31, 31 are formed in a gently curved shape, and the magnetic flux generating surfaces 29a, 29a of the magnets 29, 29 attached to the side yoke portions 30, 30 The distance H1 between the front ends (inner ends) of 29a is smaller than the distance H2 between the rear ends (outer ends), and the distance H between the magnetic flux generating surfaces 29a, 29a decreases as it approaches the lens group 5 (FIG. 6). reference).

On the other hand, for example, when the magnetic flux generating surfaces 29a, 29a are positioned in parallel, as indicated by the dotted line in FIG. , 30a and the bottom yoke portions 31, 31 on the outer peripheral side of the cylindrical portion 7 easily protrude outward from the outer periphery of the cylindrical portion 7, and the outer diameter of the cylindrical portion 7 is increased accordingly. There is a need.

Therefore, as in the driving device 25, the distance H1 between the inner ends of the magnetic flux generating surfaces 29a, 29a is made smaller than the distance H2 between the outer ends, so that the side yoke portions 30, 30 and the bottom yoke portions 31, 31 Since it becomes difficult to protrude outward from the outer circumference of the cylindrical portion 7, the outer diameter of the cylindrical portion 7 can be reduced.

The driving devices 25, 25 are located on opposite sides of the lens group 5 with respect to the center axis thereof, and are located between the first guide shaft 11 and the second guide shaft 12 in the circumferential direction. At this time, the driving devices 25, 25, the first guide shaft 11, and the second guide shaft 12 are present at substantially equal intervals in the circumferential direction.

<Summary>
As described above, the surfaces of the pair of magnets 29, 29 facing the moving coil 28 are the magnetic flux generating surfaces 29a, 29a, respectively, and the movable body 13 is arranged relative to the cylindrical portion 7 whose axial direction is the optical axis direction. The yoke 27 and the magnets 29, 29 are aligned in the circumferential direction of the tubular portion 7. As shown in FIG.

Therefore, the moving body 13 is moved in the optical axis direction inside the cylindrical portion 7 and the yoke 27 and the pair of magnets 29, 29 are arranged side by side in the circumferential direction of the cylindrical portion 7. The arrangement space of the driving devices 25, 25 is effectively utilized, the driving devices 25, 25 are efficiently arranged in a limited space, and the lens barrel 1 and the imaging device 100 in which the driving devices 25, 25 are provided are miniaturized. can be improved.

Also, by arranging the yoke 27 and the magnets 29 and 29 in the circumferential direction of the tubular portion 7, the arm portion 17 of the lens holding frame 14 can be easily inserted between the magnets 29 and 29 and the arm portion 17 can be moved. Since the movable coil 28 can be easily fixed to the body, the shape of the lens holding frame 14 including the arm portion 17 can be made simple, and the structure of the lens barrel 1 can be simplified and the manufacturing cost can be reduced. can be reduced.

Furthermore, since the magnets 29, 29 are arranged on both sides of the moving coil 28 in the circumferential direction, for example, compared to a configuration in which a cylindrical magnet is arranged on the outer peripheral side of the moving coil 28, a cylindrical magnet is arranged. The size of the driving device 25 can be reduced in the radial direction R (see FIG. 4) of the portion 7, and the size of the lens barrel 1 can be reduced in the radial direction.

In particular, even if the thickness of the magnets 29, 29 is increased, the magnetic flux density can be increased without increasing the radial size of the tubular portion 7, resulting in an increase in the size of the lens barrel 1 in the radial direction. Therefore, the driving force for the moving coil 28 can be improved.

Furthermore, since the cylindrical portion 7 is formed in a cylindrical shape, the yoke 27 and the pair of magnets 29, 29 are aligned in the circumferential direction of the cylindrical portion 7, so that the yoke 27 and a pair of magnets 29, 29 are arranged side by side in the circumferential direction, and the space efficiency regarding the arrangement space of the driving devices 25, 25 can be improved.

In addition, the distance H1 between the inner ends of the magnetic flux generating surfaces 29a, 29a of the magnets 29, 29 is smaller than the distance H2 between the outer ends.

Therefore, the magnets 29, 29 are not positioned in parallel, and the side yoke portions 30, 30 and the bottom yoke portions 31, 31 are less likely to protrude outward from the outer periphery of the tubular portion 7. Therefore, the outer diameter of the tubular portion 7 is reduced. It is possible to reduce the size of the outer shape of the tubular portion 7 .

In particular, by making the distance H1 smaller than the distance H2, it is desirable that the magnetic flux generating surfaces 29a, 29a are positioned on the plane Q including the optical axis P (central axis of the lens) or substantially parallel to the plane Q. (See FIG. 7). By configuring in this manner, the side yoke portions 30, 30 and the bottom yoke portions 31, 31 are much less likely to protrude outward from the outer periphery of the cylindrical portion 7, so that the outer shape of the cylindrical portion 7 is reduced in size. In addition, it becomes possible to increase the magnetic flux density by increasing the thickness of the magnets 29, 29. FIG.

Since it is possible to increase the magnetic flux density of the magnets 29, 29 in this way, it is possible to obtain a sufficient thrust force without arranging the magnets all around the yoke 27, and to drive the moving coil 28 sufficiently. It is possible to reduce the size of the driving device 25 while securing the force.

However, when the magnetic flux generating surfaces 29a, 29a are positioned on the plane Q including the optical axis P or substantially parallel to the plane Q, the inclination angle of the magnetic flux generating surfaces 29a, 29a to each other is increases, the leakage magnetic flux increases and the generated thrust may decrease. Therefore, it is desirable to set the orientation of the magnetic flux generating surfaces 29a, 29a to an optimum orientation in consideration of the size reduction of the outer shape of the cylindrical portion 7 and the magnitude of the generated thrust.

In the lens barrel 1, the yoke 27 is formed in the shape of a round shaft and the moving coil 28 is formed in the shape of a cylinder. There is no need to change the shape of the body, and the design can be facilitated.

In the driving device 25 , the yoke 27 , the moving coil 28 and the pair of magnets 29 , 29 are positioned on the outer periphery of the inner space of the cylindrical portion 7 .

Therefore, since the yoke 27, the moving coil 28, and the pair of magnets 29, 29 are positioned close to the inner peripheral surface of the cylindrical portion 7, the arrangement space of the moving body 13 and the driving device 25 inside the cylindrical portion 7 is Space efficiency can be improved.

Further, a frame-shaped outer yoke 26 is provided at a position surrounding the moving coil 28, and the outer yoke 26 is positioned parallel to a pair of side yoke portions 30, 30 and a pair of bottom yoke portions 31, 31 positioned parallel to each other. Magnets 29, 29 are attached to the side yoke portions 30, 30, respectively, and both ends of the yoke 27 are attached to the bottom yoke portions 31, 31, respectively.

Therefore, since the magnets 29, 29 and the outer yoke 26 to which the yoke 27 is attached are arranged at positions surrounding the moving coil 28, a large driving force for the moving body 13 can be secured.

In addition, since the moving coil 28 is formed in a cylindrical shape and the side yoke portions 30, 30 are positioned on both sides of the moving coil 28, the moving coil 28 can move across the magnetic field existing between the magnets 29, 29 and the yoke 27. The existence ratio of the coil 28 is increased, and a large driving force applied to the moving coil 28 can be secured.

In the configuration of the driving device 25, the product of the total area of the magnetic flux generating surfaces 29a, 29a of the magnets 29, 29 and the magnetic flux density of the magnets 29, 29 is approximately the total magnetic flux flowing into the yoke 27, and this total magnetic flux is By dividing by the cross-sectional area of the yoke 27 perpendicular to the optical axis, the approximate magnetic flux density inside the yoke 27 can be obtained. Therefore, in order to suppress magnetic saturation in the magnetic circuit of the driving device 25, it is desirable that the maximum area of the cross section perpendicular to the optical axis of the yoke 27 with respect to the total area of the magnetic flux generating surfaces 29a, 29a is a certain size or more. .

In the driving device 25, the maximum area of the cross section of the yoke 27 perpendicular to the optical axis is set to 5% or more of the total area of the magnetic flux generating surfaces 29a, 29a. That is, the circular cross-sectional area of the yoke 27 is 5% or more of the total area of the two magnetic flux generating surfaces 29a, 29a.

By configuring the yoke 27 and the magnets 29, 29 to have such a relationship, magnetic saturation is less likely to occur in the relationship between the magnets 29, 29 and the yoke 27, suppressing a drop in the thrust generated in the magnetic circuit, A sufficient driving force for the moving body 13 can be secured.

Further, since at least a part of the cross section of the yoke 27 in the direction orthogonal to the optical axis direction is circular, the outer shape of the yoke 27 can be reduced and the area of the cross section orthogonal to the optical axis can be increased. is possible, magnetic saturation is less likely to occur, and the driving efficiency can be improved while miniaturizing the driving device 25 .

Furthermore, since the moving coil 28 is formed in a cylindrical shape, it is possible to increase the number of turns while reducing the outer shape of the moving coil 28, so that the driving device 25 can be further miniaturized and driven. Efficiency can be improved.

Furthermore, by forming the yoke 27 in the shape of a round shaft and the moving coil 28 in the shape of a cylinder, the orientation of the magnets 29, 29 with respect to the yoke 27 and the moving coil 28 can be adjusted to the position of the lens group 5 or the lens barrel 1. It is possible to easily adjust the positional relationship with other components, and it is possible to improve the degree of freedom in design and reduce the size of the lens barrel 1 .

In addition, the holding body 6 is formed with placement recesses 7d, 7d in which parts of the driving devices 25, 25 are placed, and relief recesses 7c, 8c in which parts of the projecting portion 16 are placed. The thickness of the portions of the annular portion 8 where the placement recesses 7d, 7d and relief recesses 7c, 8c are not formed is greater than the thickness of the portions where the placement recesses 7d, 7d and relief recesses 7c, 8c are formed.

Therefore, it is possible to reduce the outer diameter of the holding body 6 while ensuring sufficient strength of the holding body 6, and it is possible to ensure high strength of the lens barrel 1 and to achieve miniaturization. .

In addition, the lens barrel 1 is provided with two driving devices 25, 25, which are positioned substantially opposite to each other with the lens group 5 interposed therebetween.

Therefore, since the driving devices 25, 25 are positioned on both sides of the lens group 5, unnecessary moment is hardly generated in the moving body 13, and the moving body 13 can be smoothly moved in the optical axis direction.

In the lens barrel 1, by configuring the driving devices 25, 25 so that the total thrust force generating point is substantially coincident with the center of gravity of the moving body 13, almost no unnecessary moment is generated in the moving body 13. Therefore, the moving body 13 can be moved more smoothly in the optical axis direction.

Further, a first guide shaft 11 and a second guide shaft 12 are provided for guiding the movable body 13 in the optical axis direction. located on the opposite side.

Therefore, since the moving body 13 is guided by the first guide shaft 11 and the second guide shaft 12 positioned substantially opposite to each other with the lens group 5 interposed therebetween, the moving body 13 moves in the optical axis direction. Sometimes, the inner peripheral surface of the moving coil 28 becomes difficult to contact the outer peripheral surface of the yoke 27, and the movable body 13 is smoothly moved in the optical axis direction while ensuring high positional accuracy in the direction orthogonal to the optical axis of the lens group 5. be able to.

Furthermore, the first guide shaft 11, one drive device 25, the second guide shaft 12, and the other drive device 25 are arranged in order at substantially equal intervals in the circumferential direction.

Accordingly, the driving devices 25, 25 are positioned substantially on opposite sides of the lens group 5, and the first guide shaft 11 and the second guide shaft 12 are positioned between the driving devices 25, 25 in the circumferential direction, respectively. Therefore, the moving body 13 can be moved more smoothly in the optical axis direction.

In the lens barrel 1, the first guide shaft 11 and the second guide shaft 12 may be arranged at any position in the circumferential direction. The shafts 12 may be arranged side by side in the circumferential direction.

Similarly, the driving devices 25, 25 may also be arranged at any position in the circumferential direction, for example, the driving devices 25, 25 may be arranged at positions aligned in the circumferential direction.

<Others>
An example of the magnets 29, 29 formed in a flat plate shape is shown above, but, for example, magnets 29A, 29A formed in an arc shape along the moving coil 28 may be used (see FIG. 8). In this case, arc-shaped magnets 29A, 29A may be used (see FIG. 8). In this case, arcuate side yoke portions 30A, 30A or other shaped side yokes may be used.

By using the magnets 29A, 29A formed in an arc shape along the moving coil 28, the distance between the magnetic flux generating surfaces 29b, 29b and the outer peripheral surface of the moving coil 28 is reduced in the circumferential direction of the moving coil 28. As a result, the magnetic flux density is improved, and the driving force for the moving coil 28 can be improved.

However, the plate-shaped magnets 29, 29 are easy to mold, have high mass productivity, and can be manufactured at a low cost. It is desirable to consider and decide.

In the above, an example in which the driving devices 25 and 25 are arranged inside the tubular portion 7 having a circular outer shape is shown, but the tubular portion 7 may have a non-circular outer shape. For example, it may have an elliptical shape, a rectangular shape, a substantially rectangular shape, or the like (see FIG. 9).

Even when the cylindrical portion 7 has a non-circular shape, the yoke 27 and the pair of magnets 29 of the driving device 25 are aligned in the circumferential direction S of the cylindrical portion 7 . Therefore, in this case as well, the space for arranging the driving devices 25, 25 can be effectively used, and the driving devices 25, 25 can be efficiently arranged in a limited space. Also, the size of the imaging device 100 can be reduced.

In the above example, the yoke 27 is formed in the shape of a round shaft and the moving coil 28 is formed in the shape of a cylinder. The shape may be rectangular, substantially rectangular, or the like. The moving coil 28 may also be formed in a non-cylindrical shape according to the shape of the yoke 27 .

However, the substantially rectangular yoke 27 can reduce the manufacturing cost. When determining the cross-sectional shapes of the yoke 27 and the moving coil 30, it is desirable to determine them in consideration of the manufacturing cost and the required driving force.

<One Embodiment of Imaging Apparatus>
A configuration example of an embodiment of the imaging device of the present technology will be described below (see FIG. 10).

The imaging apparatus 100 includes an imaging element 204 having a photoelectric conversion function that converts captured light into an electric signal, a camera signal processing unit 81 that performs signal processing such as analog-to-digital conversion of a captured image signal, and an image signal. and an image processing unit 82 for performing recording and reproduction processing. In addition, the imaging apparatus 100 includes a display unit 83 for displaying captured images and the like, an R/W (reader/writer) 84 for writing and reading image signals to and from a memory 88, and the imaging apparatus 100 as a whole. A CPU (Central Processing Unit) 85 for control, an input section 86 (operation section 202) such as various switches for which a user performs required operations, and a lens drive control section for controlling the drive of the lens group (movable group) 5. 87.

A camera signal processing unit 81 performs various kinds of signal processing such as conversion of an output signal from the imaging element 204 into a digital signal, noise removal, image quality correction, and conversion into a luminance/color difference signal.

The image processing unit 82 performs compression encoding/decompression decoding processing of image signals based on a predetermined image data format, conversion processing of data specifications such as resolution, and the like.

The display unit 83 has a function of displaying various data such as the operation state of the user's input unit 86 and captured images.

The R/W 84 writes the image data encoded by the image processing unit 82 to the memory 88 and reads the image data recorded in the memory 88 .

The CPU 85 functions as a control processing section that controls each circuit block provided in the imaging device 100 and controls each circuit block based on an instruction input signal or the like from the input section 86 .

The input unit 86 outputs an instruction input signal to the CPU 85 according to the user's operation.

A lens drive control unit 87 controls a motor (not shown) for driving the lens groups 5, 5, . . . based on a control signal from the CPU 85.

The memory 88 is, for example, a semiconductor memory that can be inserted into and removed from a slot connected to the R/W 84 . Note that the memory 88 may not be detachable from the slot, and may be incorporated inside the imaging device 100 .

The operation of the imaging device 100 will be described below.

In the standby state for photographing, under the control of the CPU 85, the photographed image signal is output to the display section 83 via the camera signal processing section 81 and displayed as a camera through image. Further, when an instruction input signal for zooming is input from the input unit 86, the CPU 85 outputs a control signal to the lens drive control unit 87, and based on the control of the lens drive control unit 87, a predetermined lens group 5 is operated. be moved.

When photographing is performed by an instruction input signal from the input unit 86, the photographed image signal is output from the camera signal processing unit 81 to the image processing unit 82, compression-encoded, and converted into digital data in a predetermined data format. be done. The converted data is output to R/W 84 and written to memory 88 .

Focusing is performed by the lens driving control section 87 moving the predetermined lens group 5 based on the control signal from the CPU 85 .

When reproducing the image data recorded in the memory 88, predetermined image data is read out from the memory 88 by the R/W 84 according to the operation on the input unit 86, and the image processing unit 82 performs decompression decoding processing. After that, the reproduced image signal is output to the display unit 83 and the reproduced image is displayed.

In the present technology, “imaging” means photoelectric conversion processing for converting light captured by the image sensor 204 into an electric signal, and conversion of an output signal from the image sensor 204 by the camera signal processing unit 81 into a digital signal. , noise removal, image quality correction, processing such as conversion to luminance/color difference signals, compression encoding/expansion decoding processing of image signals based on a predetermined image data format by the image processing unit 82, and conversion processing of data specifications such as resolution , and write processing of the image signal to the memory 88 by the R/W 84, or only a part of the series of processing, or the entire processing.

In other words, “imaging” may refer only to photoelectric conversion processing for converting light captured by the image sensor 204 into an electrical signal, and may also refer to photoelectric conversion processing for converting light captured by the image sensor 204 to an electrical signal. It may refer to processing such as conversion of the output signal from the image pickup device 204 by the camera signal processing unit 81 into a digital signal, noise removal, image quality correction, conversion into a luminance/color difference signal, and the like. Through processing such as photoelectric conversion processing for converting light into electrical signals, conversion of output signals from the image sensor 204 by the camera signal processing unit 81 into digital signals, noise removal, image quality correction, and conversion into luminance/color difference signals, It may also refer to compression encoding/decompression decoding processing of an image signal based on a predetermined image data format by the image processing unit 82 and conversion processing of data specifications such as resolution. from photoelectric conversion processing to conversion of the output signal from the image sensor 204 by the camera signal processing unit 81 into a digital signal, noise removal, image quality correction, conversion to luminance/color difference signals, etc., and processing such as It may refer to compression encoding/expansion decoding processing of image signals based on a predetermined image data format, conversion processing of data specifications such as resolution, etc., and write processing of image signals to memory 88 by R/W 84. You can point In the above processing, the order of each processing may be changed as appropriate.

In addition, in the present technology, the lens barrel 1 and the imaging device 100 are configured to include only some or all of the imaging element 204, the camera signal processing unit 81, the image processing unit 82, and the R/W 84 that perform the above processes. may have been

Alternatively, the lens barrel 1 may include part of the image sensor 204, the camera signal processing section 81, the image processing section 82, and the R/W 84, and the device body 200 may include the rest.

<This technology>
The present technology can also be configured as follows.

(1)
applying a driving force in the optical axis direction to a moving body having at least one lens and a lens holding frame holding the lens;

a yoke extending in the optical axis direction;
a moving coil that is inserted through the yoke and is fixed to the moving body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the moving coil,
The surfaces of the pair of magnets facing the moving coil are magnetic flux generating surfaces,
the movable body is moved in the optical axis direction inside the cylindrical portion with respect to the cylindrical portion whose axial direction is the optical axis direction;
A drive device in which the direction in which the yoke and the pair of magnets are arranged is the circumferential direction of the cylindrical portion.

(2)
The driving device according to (1), wherein the tubular portion is formed in a substantially cylindrical shape.

(3)
When one end of the magnetic flux generation surface on the side of the lens in the radial direction of the lens is defined as an inner end and one end opposite to the lens is defined as an outer end,
The driving device according to (2), wherein the distance between the inner ends of the magnetic flux generating surfaces of the pair of magnets is smaller than the distance between the outer ends.

(4)
The driving device according to (1) or (2), wherein the magnetic flux generating surface is positioned substantially parallel to a virtual plane including the optical axis.

(5)
The driving device according to any one of (1) to (4), wherein the yoke, the moving coil, and the pair of magnets are positioned on the outer periphery of the inner space of the cylindrical portion.

(6)
A frame-shaped outer yoke is arranged at a position surrounding the moving coil,
The outer yoke has a pair of side yoke portions positioned in parallel and a pair of bottom yoke portions positioned in parallel,
The magnets are respectively attached to the pair of side yoke portions,
The driving device according to any one of (1) to (5), wherein both ends of the yoke in the optical axis direction are attached to the pair of bottom yoke portions.

(7)
The driving device according to any one of (1) to (6), wherein the maximum area of the cross section of the yoke perpendicular to the optical axis is 5% or more of the total area of the magnetic flux generating surfaces of the pair of magnets.

(8)
The driving device according to any one of (1) to (7), wherein the yoke has at least a portion of a circular cross section in a direction orthogonal to the optical axis direction.

(9)
The driving device according to (8), wherein the moving coil is cylindrical.

(10)
The lens holding frame is provided with a fixed portion to which the movable coil is fixed by adhesion,
The driving device according to (9), wherein at least part of the fixed portion is positioned in a space between the pair of magnets and the moving coil.

(11)
A plurality of the fixing portions are provided,
The driving device according to (10), wherein the plurality of fixed portions are provided at substantially equal intervals in the circumferential direction of the moving coil.

(12)
The driving device according to any one of (9) to (11), wherein the magnetic flux generation surface is formed in an arcuate shape along the outer peripheral surface of the moving coil.

(13)
a cylindrical portion whose axial direction is the optical axis direction;
a moving body that has at least one lens and a lens holding frame that holds the lens and is moved in the optical axis direction inside the tubular portion;
a driving device for applying a driving force for moving the moving body in the optical axis direction,
The driving device
a yoke extending in the optical axis direction;
a moving coil that is inserted through the yoke and is fixed to the moving body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the moving coil,
The surfaces of the pair of magnets facing the moving coil are magnetic flux generating surfaces,
A lens barrel in which the yoke and the pair of magnets are aligned in the circumferential direction of the cylindrical portion.

(14)
Two driving devices are provided,
The lens barrel according to (13), wherein the two driving devices are positioned substantially on opposite sides of the lens.

(15)
Two guide shafts are provided for guiding the moving body in the optical axis direction,
The lens barrel according to (14), wherein the two guide shafts are positioned on substantially opposite sides of the lens.

(16)
The lens barrel according to (15), wherein one of the guide shafts, one of the driving devices, the other of the guide shafts, and the other of the driving devices are sequentially arranged at substantially equal intervals in the circumferential direction.

(17)
Equipped with a lens barrel that captures an optical image and an imaging device that converts the captured optical image into an electrical signal,
The lens barrel is
a cylindrical portion whose axial direction is the optical axis direction;
a moving body that has at least one lens and a lens holding frame that holds the lens and is moved in the optical axis direction inside the tubular portion;
a driving device for applying a driving force for moving the moving body in the optical axis direction,
The driving device
a yoke extending in the optical axis direction;
a moving coil that is inserted through the yoke and is fixed to the moving body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the moving coil,
The surfaces of the pair of magnets facing the moving coil are magnetic flux generating surfaces,
An imaging device, wherein the direction in which the yoke and the pair of magnets are arranged is the circumferential direction of the cylindrical portion.

(18)
Two driving devices are provided,
The imaging device according to (17), wherein the two driving devices are positioned substantially on opposite sides of the lens.

(19)
Two guide shafts are provided for guiding the moving body in the optical axis direction,
The imaging device according to (18), wherein the two guide shafts are located on substantially opposite sides of the lens.

(20)
The imaging device according to (19), wherein one of the guide shafts, one of the driving devices, the other of the guide shafts, and the other of the driving devices are sequentially arranged at substantially equal intervals in the circumferential direction.

DESCRIPTION OF SYMBOLS 100... Imaging device, 204... Imaging element, 1... Lens barrel, 5... Lens group (lens), 7... Cylindrical part, 11... First guide shaft, 12... Second guide shaft, 13... Moving body , 14... Lens holding frame 19... Fixed part 21... Fixed part 25... Drive device 26... Outer yoke 27... Yoke 28... Drive coil 29... Magnet 29a... Magnetic flux generating surface 30... Side yoke Part 31... Bottom yoke part

Claims (12)

a tubular portion formed in a cylindrical shape with an axial direction aligned with the optical axis;
a moving body that has at least one lens and a lens holding frame that holds the lens and is moved in the optical axis direction inside the tubular portion;
a driving device that is positioned at the outer peripheral portion of the inner space of the cylindrical portion and applies a driving force for moving the moving body in the optical axis direction;
a guide shaft that guides the moving body in the optical axis direction,
The driving device
a yoke extending in the optical axis direction;
a moving coil that is inserted through the yoke and is fixed to the moving body and movable in the optical axis direction along the yoke;
a pair of plate-shaped magnets positioned on both sides of the yoke and the moving coil and having surfaces facing the moving coil as magnetic flux generating surfaces;
an outer yoke having a pair of plate-shaped side yoke portions to which the magnets are respectively attached;
The direction in which the yoke, the pair of magnets, and the pair of side yoke portions are arranged is the circumferential direction of the tubular portion,
When one end of the magnetic flux generation surface on the side of the lens in the radial direction of the lens is defined as an inner end and one end opposite to the lens is defined as an outer end,
the distance between the inner ends of the magnetic flux generating surfaces of the pair of magnets is smaller than the distance between the outer ends;
A lens barrel in which the pair of side yoke portions approach each other as they approach the center of the cylindrical portion. 2. The lens barrel according to claim 1, wherein the magnetic flux generating surface is positioned substantially parallel to a virtual plane containing the optical axis. The outer yoke is formed in a frame shape at a position surrounding the moving coil,
the outer yoke has the pair of side yoke portions and a pair of bottom yoke portions positioned in parallel,
The lens barrel according to claim 1, wherein both ends of the yoke in the optical axis direction are attached to the pair of bottom yoke portions. 2. The lens barrel according to claim 1, wherein the maximum area of the cross section of the yoke perpendicular to the optical axis is 5% or more of the total area of the magnetic flux generating surfaces of the pair of magnets. 2. The lens barrel according to claim 1, wherein the yoke has at least a portion of a circular cross section in a direction perpendicular to the optical axis direction. The lens barrel according to claim 5, wherein the moving coil is cylindrical. The lens holding frame is provided with a fixed portion to which the movable coil is fixed by adhesion,
7. The lens barrel according to claim 6, wherein at least part of said fixed portion is positioned in a space between said pair of magnets and said moving coil. A plurality of the fixing portions are provided,
The lens barrel according to Claim 7, wherein the plurality of fixed portions are provided at substantially equal intervals in the circumferential direction of the moving coil. Two driving devices are provided,
2. The lens barrel according to claim 1, wherein the two driving devices are positioned substantially on opposite sides of the lens. Two guide shafts are provided,
10. The lens barrel according to claim 9, wherein the two guide shafts are located on opposite sides of the lens. 11. The lens barrel according to claim 10, wherein one of the guide shafts, one of the driving devices, the other of the guide shafts, and the other of the driving devices are arranged in order at approximately equal intervals in the circumferential direction. Equipped with a lens barrel that captures an optical image and an imaging device that converts the captured optical image into an electrical signal,
The lens barrel is
a tubular portion formed in a cylindrical shape with an axial direction aligned with the optical axis;
a moving body that has at least one lens and a lens holding frame that holds the lens and is moved in the optical axis direction inside the tubular portion;
a driving device that is positioned at the outer peripheral portion of the inner space of the cylindrical portion and applies a driving force for moving the moving body in the optical axis direction;
a guide shaft that guides the moving body in the optical axis direction,
The driving device
a yoke extending in the optical axis direction;
a moving coil that is inserted through the yoke and is fixed to the moving body and movable in the optical axis direction along the yoke;
a pair of plate-shaped magnets positioned on both sides of the yoke and the moving coil and having surfaces facing the moving coil as magnetic flux generating surfaces;
an outer yoke having a pair of plate-shaped side yoke portions to which the magnets are respectively attached;
The direction in which the yoke, the pair of magnets, and the pair of side yoke portions are arranged is the circumferential direction of the tubular portion,
When one end of the magnetic flux generation surface on the side of the lens in the radial direction of the lens is defined as an inner end and one end opposite to the lens is defined as an outer end,
the distance between the inner ends of the magnetic flux generating surfaces of the pair of magnets is smaller than the distance between the outer ends;
The imaging device, wherein the pair of side yoke portions approach each other as they approach the center of the cylindrical portion.

Images