WO2019187634A1

WO2019187634A1 - Driving device, lens barrel, and imaging device

Info

Publication number: WO2019187634A1
Application number: PCT/JP2019/003858
Authority: WO
Inventors: 田中　徹
Original assignee: ソニー株式会社
Priority date: 2018-03-30
Filing date: 2019-02-04
Publication date: 2019-10-03
Also published as: JPWO2019187634A1; JP2023115126A; CN111902758B; CN111902758A

Abstract

The present invention miniaturizes an imaging device and a lens barrel to which a driving device is provided. This invention is provided with: a yoke that extends in an optical axis direction and applies, in the optical axis direction, a driving force to a mobile body having at least one lens and a lens holding frame for holding the lens; a movable coil into which the yoke is inserted and which is fixed to the mobile body and movable along the yoke in the optical axis direction; and a pair of magnets that are positioned on both sides of the yoke and the movable coil. The surfaces of the magnets opposed to the movable coil are set as magnetic flux generating surfaces. In a cylindrical part disposed such that the axis direction thereof matches the optical axis direction, the mobile body is moved in the optical axis direction inside a cylindrical part. The arraying direction of the yoke and the magnets is set as the circumferential direction of the cylindrical part.

Description

Driving device, lens barrel, and imaging device

The present technology relates to a technical field of a driving device that applies a driving force to a moving body having a lens, a lens barrel including the driving device, and an imaging device.

Various imaging devices such as a video camera and a still camera are provided with a lens barrel that captures an optical image via a photographing optical system such as a lens, and the lens barrel has a plurality of lens groups arranged in the optical axis direction. There is something that has been. In some cases, the imaging apparatus is not provided with a lens barrel, and an interchangeable lens or the like that is detachable from the imaging apparatus is used as the lens barrel.

Some of these lens barrels have a configuration 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, and 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 a thrust generated in a magnetic circuit as a driving force to the moving body when a current is supplied to the moving coil. (For example, refer to Patent Document 1, Patent Document 2, and Patent Document 3).

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

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

The drive device described in Patent Document 3 has a configuration in which a movable coil is disposed on the outer peripheral side of the yoke, and a pair of magnets are disposed on the opposite side across the yoke and the movable coil.

Japanese Patent Laid-Open No. 4-30506 Japanese Patent Laid-Open No. 7-170710 JP 2006-14514 A

However, in the driving devices described in Patent Document 1 and Patent Document 2, a movable coil is disposed on the outer peripheral side of the guide shaft or the yoke, and a magnet is disposed on the outer peripheral side of the movable coil. Therefore, it tends to be large in the radial direction, and there is a possibility that the lens barrel and the imaging device become large because the lens barrel in which the driving device is arranged and the arrangement space of the driving device in the imaging device are large.

In the driving device described in Patent Document 3, the driving force is increased by increasing the thickness of the central yoke. However, the driving force is also increased by increasing the thickness of the central yoke. There is a risk that the size of the lens barrel and the imaging device may be hindered due to the increase in size of the device.

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

1stly, the drive device which concerns on this technique gives the driving force to an optical axis direction with respect to the moving body which has at least 1 lens and the lens holding frame holding the said lens, and the yoke extended in an optical axis direction And a movable coil that is inserted into the yoke and fixed to the movable 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 movable coil, The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces, and the movable body is in the optical axis direction inside the cylindrical portion with respect to the cylindrical portion whose axial direction is the optical axis direction. It is moved, and the arrangement direction of the yoke and the pair of magnets is made the circumferential direction of the cylindrical portion.

Thereby, the moving body is moved in the optical axis direction inside the cylindrical portion, and the yoke and the pair of magnets are arranged in the circumferential direction of the cylindrical portion.

Second, in the above drive device, it is desirable that the cylindrical portion is formed in a substantially cylindrical shape.

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

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

This prevents the pair of magnets from being positioned in parallel and makes it difficult for the ends of the magnets to protrude outwardly from the outer periphery of the cylindrical portion.

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

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

Fifth, in the drive device described above, it is desirable that the yoke, the movable coil, and the pair of magnets are positioned on the outer peripheral portion in the internal space of the cylindrical portion.

Thus, the yoke, the movable coil, and the pair of magnets are positioned close to the inner peripheral surface of the cylindrical portion.

Sixth, in the drive device described above, a frame-shaped outer yoke is disposed at a position surrounding the movable coil, and a pair of bottoms positioned in parallel with the pair of side yoke portions in which the outer yoke is positioned in parallel. Preferably, the magnet is attached to the pair of side yoke portions, and both end portions in the optical axis direction of the yoke are attached to the pair of bottom yoke portions.

This places a magnet and an outer yoke with a yoke attached at a position surrounding the movable coil.

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

This makes it difficult for magnetic saturation to occur in the relationship between the magnet and the yoke, and suppresses a reduction in thrust generated in the magnetic circuit.

Eighth, in the above drive device, it is desirable that at least a part of a cross section of the yoke in a direction orthogonal to the optical axis direction is formed in a circular shape.

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 above drive device, it is desirable that the movable coil is formed in a cylindrical shape.

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

Tenth, in the drive device described above, the lens holding frame is provided with a fixed portion to which the movable coil is fixed by adhesion, and at least a part of the fixed portion is between the pair of magnets and the movable coil. It is desirable to be located in the space.

This will enable effective use of the adhesive filling space.

Eleventh, in the drive device described above, it is preferable that a plurality of the fixed portions are provided, and the plurality of fixed portions are provided at substantially equal intervals in the circumferential direction of the movable coil.

Thereby, the fixed positions of the movable coil with respect to the lens holding frame are distributed in the circumferential direction.

12thly, in the above drive device, it is desirable that the magnetic flux generating surface is formed in an arcuate surface along the outer peripheral surface of the movable coil.

Thereby, the magnetic flux density is improved by reducing the distance between the magnetic flux generating surface and the outer peripheral surface of the movable coil in the circumferential direction of the movable coil.

13thly, the lens-barrel which concerns on this technique has a cylindrical part by which the axial direction was made into the optical axis direction, at least 1 lens, and the lens holding frame holding the said lens, The inside of the said cylindrical part A moving body that is moved in the optical axis direction, and a driving device that applies a driving force for moving the moving body in the optical axis direction, the driving device including a yoke that extends in the optical axis direction, A movable coil that is fixed to the movable 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 movable coil. The surface of the magnet that faces the movable coil is a magnetic flux generating surface, and the arrangement direction of the yoke and the pair of magnets is the circumferential direction of the cylindrical portion.

14thly, in the lens barrel described above, it is desirable that two of the driving devices are provided, and that the two driving devices are positioned on substantially opposite sides of the lens.

This makes it difficult to generate unnecessary moments on the moving object.

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

As a result, the moving body is guided by the two guide shafts positioned substantially opposite to each other across the lens and moved in the optical axis direction, so that the inner peripheral surface of the movable coil becomes the outer peripheral surface of the yoke when the moving body moves. It becomes difficult to touch.

Sixteenth, 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 sequentially arranged at substantially equal intervals in the circumferential direction. It is desirable.

Thus, the driving device is positioned on the substantially opposite side across the lens, and one guide shaft and the other guide shaft are positioned in the circumferential direction between the driving devices.

Seventeenth, an imaging apparatus according to the present technology includes a lens barrel that captures an optical image and an imaging element that converts the captured optical image into an electrical signal, and the axial direction of the lens barrel is an optical axis direction. A movable body having at least one lens and a lens holding frame for holding the lens, the movable body being moved in the optical axis direction inside the cylindrical portion, and the optical axis direction of the movable body A driving device that applies a driving force for movement to the optical axis, and the driving device includes a yoke that extends in an optical axis direction, and the optical axis along the yoke that is inserted into the yoke and fixed to the moving body. A movable coil movable in a direction, a pair of magnets positioned on both sides of the yoke and the movable coil, and surfaces of the pair of magnets facing the movable coil are magnetic flux generating surfaces, respectively, And said In which the arrangement direction of the pair of magnets are in a circumferential direction of the cylindrical portion.

Eighteenth, in the above-described imaging device, it is desirable that two drive devices are provided, and the two drive devices are positioned on substantially opposite sides of the lens.

This makes it difficult to generate unnecessary moments on the moving object.

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

20thly, in the above-mentioned imaging device, one said guide shaft, one said drive device, the other said guide shaft, and the other said drive device are arrange | positioned in the position of substantially equal intervals in order in the circumferential direction. Is desirable.

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 in the circumferential direction of the cylindrical portion. The arrangement space can be effectively used, and the lens barrel provided with the driving device and the imaging device can be downsized.

It should be noted that the effects described in this specification are merely examples and are not limited, and may have other effects.

FIGS. 2 to 10 show an embodiment of a driving device of the present technology, a lens barrel, and an imaging device, and this drawing is a perspective view of the imaging device showing the lens barrel and the apparatus main body separately. It is a perspective view of the lens barrel which shows a part in 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. It is a conceptual diagram which shows the positional relationship of a cylindrical part and a magnet. It is a conceptual diagram which shows the example in which the magnetic flux generation surface of the magnet was located on the plane containing an optical axis. It is a conceptual diagram which shows the example using the magnet in which the magnetic flux generation surface was formed in circular arc surface shape. It is a conceptual diagram which shows the example of arrangement | positioning structure of a drive device when a holding body is formed in non-circular shape. It is a block diagram of an imaging device.

Hereinafter, modes for carrying out the present technology will be described with reference to the accompanying drawings.

In the embodiment described 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 main body of the still camera, and the driving device of the present technology is used as the lens. This is applied to a driving device arranged in a lens barrel.

It should be noted 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 main body of the still camera, and a drive device disposed on the interchangeable lens. The present technology is provided in, for example, various imaging devices 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 these various imaging devices. The present invention can be widely applied to a driving device arranged in a lens barrel.

In the following explanation, it is assumed that the front, rear, top, bottom, left and right directions are shown in the direction seen from the photographer when photographing with the still camera. Therefore, the subject side is the front and the photographer side is the rear.

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

Further, the lens group shown below may include one or a plurality of lenses and other optical elements such as a diaphragm and an iris in addition to the lens group including one or a plurality of lenses.

<Configuration of imaging device>
The imaging device 100 is configured by a device main 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 main body 200. The present technology is a type in which a lens barrel having a structure similar to the internal structure of the lens barrel 1 is incorporated inside the apparatus main body, or a retractable type in which this lens barrel protrudes or is stored in the apparatus main body. It is also possible to apply to.

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

In the outer casing 201, for example,

various operation units

202, 202,... Are arranged on the upper surface, the rear surface, and the like. As the

operation units

202, 202,..., For example, a power button, a shutter button, a zoom knob, a mode switching knob, and the like are provided.

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

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

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

<Configuration of lens barrel>
The lens barrel 1 includes a substantially cylindrical outer tube 2 whose axial direction is the front-rear direction, and required parts that are attached to or supported by the inside and outside of the outer tube 2 (see FIG. 1).

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

The lens barrel 1 has, for example, a plurality of

lens groups

5, 5,. In FIG. 1, only the frontmost lens group 5 is shown. 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. Among the

lens groups

5, 5,..., One lens group 5 is provided as a focus lens group that moves in the optical axis direction and performs focusing (see FIGS. 2 to 4).

A holding body 6 is disposed inside the outer cylinder 2. The holding body 6 has a substantially cylindrical tubular portion 7 whose axial direction is the front-rear direction and a substantially annular annular portion 8 attached to the tubular portion 7.

At the rear end of the cylindrical portion 7, a first support protrusion 7a protruding inward is provided. A second support protrusion 7 b protruding inward is provided at an intermediate portion in the front-rear direction of the cylindrical portion 7. The first support protrusion 7 a and the second support protrusion 7 b are provided at substantially opposite positions across the central axis of the cylindrical portion 7. The cylindrical portion 7 is formed with a relief recess 7c that is opened inward and extends forward and backward, and the relief recess 7c is formed at a position continuous with the first support projection 7a. Arrangement recesses 7d and 7d opened inward and forward respectively are formed in the substantially first half of the cylindrical portion 7, and the arrangement recesses 7d and 7d are positioned on the substantially opposite side across the central axis of the cylindrical portion 7. ing.

Sensor placement holes

7e and 7e are formed in the cylindrical portion 7 at positions substantially opposite to each other across the central axis.

The annular portion 8 has at least a first mounting hole 8a and a second mounting hole 8b that are opened at the rear. The first mounting hole 8a and the second mounting hole 8b are located on substantially opposite sides with the central axis of the annular portion 8 interposed therebetween. The annular portion 8 is formed with a clearance recess 8c that is opened inward and rearward, and the clearance recess 8c is positioned in the vicinity of the first mounting hole 8a.

The annular portion 8 is attached to the front end portion of the cylindrical portion 7. In a state where the annular portion 8 is attached to the cylindrical 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-rear direction (see FIG. 3).

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

Both end portions in the axial direction of the first guide shaft 11 are inserted and fixed to the first bearing caps 9 and 9. Both end portions of the second guide shaft 12 in the axial direction are inserted and fixed to the second bearing caps 10 and 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 be in the optical axis direction. (See FIGS. 3 and 4).

The moving body 13 includes 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 above-described focus lens group. The lens group 5 of the moving body 13 includes one or a plurality of lenses. The lens group 5 of the moving 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 includes an annular lens holding portion 15, a protruding portion 16 protruding from the lens holding portion 15, and

arm portions

17 and 17 protruding 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 both front and rear end portions are provided as first guided

portions

16a and 16a, respectively. The first guide shaft 11 is inserted through the first guided

portions

16a and 16a.

A part of the lens holding portion 15 is provided as the second guided

portions

15a and 15a, and the second guided

portions

15a and 15a are spaced apart from each other in the front-rear direction. The second guide shaft 12 is inserted through the second guided

portions

15a and 15a.

As described above, the moving body 13 is formed by inserting the first guide shaft 11 through the first guided

portions

16a and 16a and the second guide shaft 12 through the second guided

portions

15a and 15a. The first guide shaft 11 and the second guide shaft 12 are supported so as to be movable in the optical axis direction.

In a state where 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 and 16a is annular with the tubular portion 7. It is inserted into

relief recesses

7c and 8c formed in the portion 8 (see FIGS. 3 and 4). The portions of the cylindrical portion 7 and the annular portion 8 where the arrangement recesses 7d and 7d and the relief recesses 7c and 8c are not formed are substantially constant, and the arrangement recesses 7d and 7d and the relief recesses 7c and 8c are formed. It is thicker than the thickness of the part.

The

arm portions

17, 17 protrude outward from the lens holding portion 15, and are provided at substantially opposite positions across the central axis of the lens group 5.

The arm portion 17 has an annular inserted portion 18 and fixing

portions

19 and 19 protruding rearward from the outer peripheral portion of the inserted portion 18 (see FIG. 5). The fixing portions 19 are provided so as to be separated from each other in the circumferential direction, and the fixing portion 19 does not exist at a position farthest from the lens holding portion 15 in the arm portion 17. The fixing portion 19 is formed with a bonding concave portion 19a that opens in the center direction and rearward of the inserted portion 18.

The portions of the lens holding portion 15 from which the

arm portions

17 and 17 are projected are provided as receiving

portions

20 and 20, respectively (see FIGS. 4 and 5). The receiving part 20 is formed in an arc shape continuous with a part of the outer peripheral part of the insertion part 18, and the rear end part is provided as a fixing part 21. Accordingly, the fixing portion 21 is located behind the fixing

portions

19 and 19. The fixing portion 21 is formed with a bonding concave portion 21a that is opened in the center direction and rearward of the inserted portion 18.

The fixing

portions

19 and 19 and the fixing portion 21 are located at substantially equal intervals in the circumferential direction.

Detecting

magnets

22 and 22 are attached to the outer periphery of the lens holding portion 15 (see FIGS. 2 and 4). The

detection magnets

22 and 22 are positioned substantially on opposite sides of the central axis of the lens group 5 and are formed in a shape extending in the front-rear direction.

Magnetic sensors

23 and 23 are disposed at positions facing the

detection magnets

22 and 22, respectively. The

magnetic sensors

23 and 23 are attached to the cylindrical portion 7 with at least a part thereof being inserted into the

sensor arrangement holes

7e and 7e, respectively. The magnetic sensor 23 is mounted on the circuit board 24.

The

magnetic sensors

23 and 23 detect the strength of the magnetic field of the

detection magnets

22 and 22 that change when the moving body 13 is moved in the optical axis direction, and specify the position of the moving body 13 in the optical axis direction. Have

In the above, an example in which two

magnetic sensors

23 and 23 and

detection magnets

22 and 22 are arranged is shown. However, if the number of magnetic sensors 23 and detection magnets 22 is the same, Is optional.

駆動

Drive devices

25, 25 are attached to the annular portion 8 of the holding body 6 (see Figs. 2 to 4). The driving device 25 includes an outer yoke 26, a yoke 27, a movable coil 28, and

magnets

29 and 29.

The outer yoke 26 is formed into a frame shape by combining a pair of

side yoke portions

30 and 30 and a pair of

bottom yoke portions

31 and 31. 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 that extends in the circumferential direction of the annular portion 8 and is curved in a gentle arc shape. In the outer yoke 26, the upper and lower end portions of the

side yoke portions

30 and 30 and the left and right end portions of the

bottom yoke portions

31 and 31 are coupled to each other. In addition, as above-mentioned, as for the outer yoke 26, the

side yoke parts

30 and 30 and the

bottom yoke parts

31 and 31 may each be formed by a separate member, and one part or all part may be formed integrally. .

The yoke 27 is formed in a round shaft shape, and the axial direction is the front-rear direction. Therefore, the yoke 27 has a circular cross section in a direction orthogonal to the axial direction. The yoke 27 has both front and rear end portions coupled to the center portions of the

bottom yoke portions

31 and 31, respectively, and is positioned between the

side yoke portions

30 and 30. The yoke 27 is inserted into the inserted portion 18 of the arm portion 17 in the lens holding frame 14. The yoke 27 may be partially formed in a cavity.

The movable coil 28 is formed in a cylindrical shape. The inner diameter of the movable coil 28 is made larger than the outer diameter of the yoke 27, and the yoke 27 is inserted into the movable coil 28. The movable coil 28 is fixed to the fixing

portions

19, 19, and 21 with the front end surface in contact with the rear surface of the arm portion 17 in 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 fixing

portions

19, 19, and 21 with

adhesives

50, 50, and 50, respectively. Accordingly, the movable body 13 and the movable coil 28 are moved together in the optical axis direction.

The front end portion of the movable coil 28 is fixed to the fixed

portions

19 and 19, and the rear end portion is fixed to the fixed portion 21. Therefore, since the movable coil 28 has both front and rear end portions fixed to the fixed

portions

19, 19, 21, it is possible to secure a stable and strong fixed state of the movable coil 28 with respect to the lens holding frame 14. Note that the movable coil 28 may be fixed to the receiving

portions

20 and 20 by adhesion in a state where the outer peripheral surface is in surface contact with the outer surfaces of the receiving

portions

20 and 20.

As described above, since the movable coil 28 is formed in a cylindrical shape and the

magnets

29 and 29 located on both sides of the movable coil 28 are formed in a flat plate shape, between the

magnets

29 and 29 and the movable coil 28. A space is generated, and at least a part of the fixing

portions

19, 19, and 21 is located in this space.

Therefore, the space for filling the

adhesives

50, 50, 50 can be effectively used, and the movable coil 28 can be fixed to the lens holding frame 14 without increasing the size of the driving device 25.

In addition, since the fixed

portions

19, 19, and 21 are provided at substantially equal intervals in the circumferential direction of the movable coil 28, the fixed positions of the movable coil 28 with respect to the lens holding frame 14 are distributed and positioned in the circumferential direction. A stable and strong fixed state of the movable coil 28 with respect to the lens holding frame 14 can be ensured.

The

magnets

29 and 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 and 30 facing the movable coil 28 side, respectively. The

magnets

29, 29 are opposed to each other as magnetic flux generation surfaces 29 a, 29 a, and the magnetic flux generation surfaces 29 a, 29 a are positioned to face the movable coil 28 and the yoke 27.

In the driving device 25 configured as described above, thrust is generated by the magnetic flux generated from the magnetic flux generation surfaces 29a and 29a of the

magnets

29 and 29 and the current flowing through the movable coil 28, and the generated thrust is movable as the driving force. The movable coil 28 and the moving body 13 are moved together in a direction according to the direction of the current applied to the coil 28 and flowing through the movable 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 movable coil 28 and the moving body 13 are lighted according to the direction of the current flowing through the movable coil 28. The driving

devices

25 and 25 are moved in the inner space of the cylindrical portion 7 forward or rearward in the axial direction. The rear surfaces of the annular portion 8 are partially inserted into the arrangement

concave portions

7d and 7d of the cylindrical portion 7, respectively. Is attached. In the driving device 25, one bottom yoke portion 31 is attached to the annular portion 8 by adhesion or the like.

In a state in which the driving device 25 is attached to the annular portion 8, the bottom yoke portion 31 formed in an arc shape is positioned along the outer peripheral edge of the annular portion 8, and the

magnets

29 and 29 are circumferential directions of the tubular portion 7. Is spaced apart from each other. Therefore, the arrangement direction of the yoke 27 and the pair of

magnets

29, 29 is set to the circumferential direction S (see FIG. 4) of the cylindrical portion 7.

In the driving device 25, as described above, the

bottom yoke portions

31 and 31 are formed in a gently curved shape, and the magnetic flux generation surfaces 29a of the

magnets

29 and 29 attached to the

side yoke portions

30 and 30, In 29a, the distance H1 between the front ends (inner ends) is made smaller than the distance H2 between the rear ends (outer ends), and the distance H between the magnetic flux generating surfaces 29a and 29a is made smaller as the lens group 5 is approached (FIG. 6). reference).

On the other hand, for example, when the magnetic flux generating surfaces 29a and 29a are positioned in a parallel state, as shown by a dotted line in FIG. 6, the end portion 30a on the outer peripheral side of the cylindrical portion 7 in the

side yoke portions

30 and 30. 30a and the end portions 31a, 31a on the outer peripheral side of the cylindrical portion 7 in the

bottom yoke portions

31, 31 are likely to 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.

Accordingly, as in the driving device 25, the distance H1 between the inner ends of the magnetic flux generation surfaces 29a and 29a is made smaller than the distance H2 between the outer ends, so that the

side yoke portions

30 and 30 and the

bottom yoke portions

31 and 31 are formed. Since it becomes difficult to protrude outside from the outer periphery of the cylindrical part 7, it becomes possible to make the outer diameter of the cylindrical part 7 small.

The driving

devices

25 and 25 are located on opposite sides of the central axis of the lens group 5 and are respectively 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 that face the movable coil 28 are the magnetic flux generation surfaces 29 a, 29 a, respectively, and the moving body 13 is opposed to the cylindrical portion 7 whose axial direction is the optical axis direction. The yoke 27 and the

magnets

29 and 29 are arranged in the circumferential direction of the cylindrical portion 7.

Accordingly, the movable body 13 is moved in the optical axis direction inside the cylindrical portion 7 and the yoke 27 and the pair of

magnets

29 and 29 are arranged in the circumferential direction of the cylindrical portion 7. The arrangement space of the driving

devices

25 and 25 in the lens is effectively utilized, the driving

devices

25 and 25 are efficiently arranged in a limited space, and the lens barrel 1 and the imaging device 100 in which the

driving devices

25 and 25 are provided are small. Can be achieved.

Further, by arranging the yoke 27 and the

magnets

29 and 29 in the circumferential direction of the cylindrical 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. Since the movable coil 28 can be easily fixed to the lens holding frame 14, the shape of the lens holding frame 14 including the arm portion 17 can be simplified, and the structure of the lens barrel 1 can be simplified and the manufacturing cost can be reduced. Can be reduced.

Furthermore, the

magnets

29 and 29 are configured to be positioned on both sides of the movable coil 28 in the circumferential direction, so that, for example, a cylindrical shape is provided as compared with a configuration in which a cylindrical magnet is disposed on the outer peripheral side of the movable coil 28. The drive device 25 can be downsized in the radial direction R (see FIG. 4) of the portion 7, and the lens barrel 1 can be downsized in the radial direction.

In particular, even if the thickness of the

magnets

29 and 29 is increased, the magnetic flux density can be increased without increasing the size of the cylindrical portion 7 in the radial direction, and the size of the lens barrel 1 in the radial direction is increased. Thus, the driving force for the movable coil 28 can be improved.

Furthermore, since the cylindrical portion 7 is formed in a cylindrical shape, the arrangement direction of the yoke 27 and the pair of

magnets

29, 29 is set to the circumferential direction of the cylindrical portion 7 formed in a cylindrical shape. 27 and the pair of

magnets

29 and 29 are arranged side by side in the circumferential direction, and the space efficiency related to the arrangement space of the

drive devices

25 and 25 can be improved.

In addition, the distance H1 between the inner ends of the magnetic

flux generation surfaces

29a, 29a of the

magnets

29, 29 is smaller than the distance H2 between the outer ends.

Accordingly, the

magnets

29 and 29 are not positioned in parallel, and the

side yoke parts

30 and 30 and the

bottom yoke parts

31 and 31 are difficult to protrude outward from the outer periphery of the cylindrical part 7, so that the outer diameter of the cylindrical part 7 is reduced. Thus, the outer shape of the cylindrical portion 7 can be reduced in size.

In particular, by making the distance H1 smaller than the distance H2, it is desirable that the magnetic flux generation surfaces 29a and 29a be positioned on the plane Q including the optical axis P (the central axis of the lens) or substantially parallel to the plane Q. (See FIG. 7). With this configuration, the

side yoke portions

30 and 30 and the

bottom yoke portions

31 and 31 are more difficult 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. It is possible to increase the magnetic flux density by increasing the thickness of the

magnets

29 and 29.

As described above, since the magnetic flux density related to the

magnets

29 and 29 can be increased, sufficient thrust can be obtained without arranging the magnet around the whole of the yoke 27 and sufficient driving for the movable coil 28 can be obtained. The drive device 25 can be reduced in size while securing the force.

However, when the magnetic flux generating surfaces 29a and 29a are configured to be positioned on the plane Q including the optical axis P or positioned substantially parallel to the plane Q, the inclination angles of the magnetic flux generating surfaces 29a and 29a with each other May increase, and the generated magnetic flux may increase and the thrust generated may decrease. Therefore, it is desirable that the direction of the magnetic flux generation surfaces 29a and 29a be set to an optimum direction in consideration of the downsizing of the outer shape of the cylindrical portion 7 and the magnitude of the generated thrust.

In the lens barrel 1, since the yoke 27 is formed in a round shaft shape and the movable coil 28 is formed in a cylindrical shape, the yoke 27 and the movable coil 28 are changed even if the directions of the magnetic flux generation surfaces 29a and 29a are changed. Therefore, the design can be simplified.

Further, in the drive device 25, the yoke 27, the movable coil 28, and the pair of

magnets

29 and 29 are positioned on the outer peripheral portion in the internal space of the cylindrical portion 7.

Accordingly, since the yoke 27, the movable coil 28, and the pair of

magnets

29 and 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 concerned. Space efficiency can be improved.

Further, a frame-shaped outer yoke 26 is provided at a position surrounding the movable coil 28, and a pair of

bottom yoke portions

31, 31 positioned in parallel with the pair of

side yoke portions

30, 30 in which the outer yoke 26 is positioned in parallel.

Magnets

29 and 29 are attached to the

side yoke portions

30 and 30, respectively, and both end portions of the yoke 27 are attached to the

bottom yoke portions

31 and 31, respectively.

Therefore, since the

magnets

29 and 29 and the outer yoke 26 to which the yoke 27 is attached are disposed at a position surrounding the movable coil 28, a large driving force for the moving body 13 can be ensured.

Further, the movable coil 28 is formed in a cylindrical shape and the

side yoke portions

30 and 30 are positioned on both sides of the movable coil 28, so that the movable coil 28 crosses the magnetic field existing between the

magnets

29 and 29 and the yoke 27. The existence ratio of the coil 28 is increased, and a large driving force applied to the movable coil 28 can be ensured.

In the configuration like the driving device 25, the product of the total area of the magnetic flux generation surfaces 29a and 29a of the

magnets

29 and 29 and the magnetic flux density of the

magnets

29 and 29 is approximately the total magnetic flux flowing into the yoke 27, and this total magnetic flux is By dividing by the area of the cross section perpendicular to the optical axis of the yoke 27, the approximate magnetic flux density inside the yoke 27 is 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 generation surfaces 29a and 29a be greater than a certain size. .

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

By configuring the yoke 27 and the

magnets

29 and 29 to have such a relationship, magnetic saturation is less likely to occur in the relationship between the

magnets

29 and 29 and the yoke 27, and a reduction in thrust generated in the magnetic circuit is suppressed. A sufficient driving force for the movable body 13 can be ensured.

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

Furthermore, since the movable coil 28 is formed in a cylindrical shape, it is possible to increase the number of turns while reducing the outer shape of the movable coil 28, and to drive the drive device 25 with further miniaturization. Efficiency can be improved.

Furthermore, the yoke 27 is formed in a round shaft shape and the movable coil 28 is formed in a cylindrical shape, so that the orientation of the

magnets

29 and 29 with respect to the yoke 27 and the movable coil 28 can be changed to the position of the lens group 5 and the lens barrel 1. It is possible to easily adjust the positional relationship with other components, so that the degree of freedom in design and the size of the lens barrel 1 can be reduced.

In addition, the holding body 6 is provided with

disposition recesses

7d and 7d in which a part of the

drive devices

25 and 25 are disposed and

escape recesses

7c and 8c in which a part of the projecting portion 16 is disposed. The thickness of the portion of the annular portion 8 where the arrangement recesses 7d and 7d and the relief recesses 7c and 8c are not formed is thicker than the thickness of the portion where the placement recesses 7d and 7d and the relief recesses 7c and 8c are formed.

Accordingly, it is possible to reduce the outer diameter of the holding body 6 while ensuring a sufficient strength of the holding body 6, so that the high strength of the lens barrel 1 can be ensured and the size can be reduced. .

Also, the lens barrel 1 is provided with two

drive devices

25, 25, and the

drive devices

25, 25 are positioned on the substantially opposite side across the lens group 5.

Therefore, since the driving

devices

25 and 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.

The lens barrel 1 is configured such that the total thrust generation point in the

driving devices

25 and 25 is substantially coincident with the center of gravity of the moving body 13, so that almost no unnecessary moment is generated in the moving body 13. 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 for guiding the moving body 13 in the optical axis direction are provided, and the first guide shaft 11 and the second guide shaft 12 are substantially sandwiched between the lens group 5. Located on the opposite side.

Accordingly, the moving body 13 is guided by the first guide shaft 11 and the second guide shaft 12 that are positioned substantially opposite to each other with the lens group 5 interposed therebetween, and is moved in the optical axis direction. Sometimes the inner peripheral surface of the movable coil 28 is 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, the one drive device 25, the second guide shaft 12, and the other drive device 25 are arranged at substantially equal intervals in order in the circumferential direction.

Accordingly, the driving

devices

25 and 25 are positioned on the substantially 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 and 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 disposed at any position in the circumferential direction. For example, the first guide shaft 11 and the second guide shaft The shaft 12 may be arranged at a position aligned in the circumferential direction.

Similarly, the driving

devices

25 and 25 may be arranged at any position in the circumferential direction, for example, the driving

devices

25 and 25 may be arranged at positions arranged in the circumferential direction.

<Others>
Although the example of the

magnets

29 and 29 formed in flat form was shown above, for example, the

magnets

29A and 29A formed in circular arc shape along the movable coil 28 may be used (refer FIG. 8). In this case,

magnets

29A and 29A formed in an arc shape may be used (see FIG. 8). In this case, arc-shaped

side yoke portions

30A, 30A or other shape side yokes may be used.

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

However, the

flat magnets

29 and 29 are easy to mold, have high mass productivity, and can reduce the manufacturing cost. Whether the magnet 29 or the magnet 29A is used depends on the manufacturing cost and the necessary driving force. It is desirable to decide in consideration.

In the above, an example in which the

driving devices

25 and 25 are arranged inside the cylindrical portion 7 whose outer shape is circular is shown, but the outer shape of the cylindrical portion 7 may be noncircular. For example, an elliptical shape, a rectangular shape, a substantially rectangular shape, or the like may be used (see FIG. 9).

Thus, even when the cylindrical portion 7 is non-circular, the arrangement direction of the yoke 27 and the pair of

magnets

29 and 29 is set to the circumferential direction S of the cylindrical portion 7 in the driving device 25. Accordingly, also in this case, the lens barrel 1 in which the arrangement space of the driving

devices

25 and 25 is effectively utilized, the driving

devices

25 and 25 are efficiently arranged in a limited space, and the

driving devices

25 and 25 are provided. In addition, the imaging device 100 can be downsized.

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

However, the manufacturing cost can be reduced if the yoke 27 is substantially rectangular. When determining the cross-sectional shapes of the yoke 27 and the movable coil 30, it is desirable to determine in consideration of the manufacturing cost and the necessary driving force.

<One Embodiment of Imaging Device>
Below, the structural example of one Embodiment of this technique imaging device is demonstrated (refer FIG. 10).

The imaging apparatus 100 includes an imaging element 204 having a photoelectric conversion function for converting captured light into an electrical signal, a camera signal processing unit 81 that performs signal processing such as analog-digital conversion of a captured image signal, and an image signal. And an image processing unit 82 for performing the recording / reproducing process. In addition, the imaging apparatus 100 includes a display unit 83 that displays captured images and the like, an R / W (reader / writer) 84 that writes and reads image signals to and from the memory 88, and the entire imaging apparatus 100. CPU (Central Processing Unit) 85 to be controlled, input unit 86 (operation unit 202) such as various switches that are operated by a user, and lens drive control unit that controls driving of the lens group (movable group) 5 87.

The camera signal processing unit 81 performs various signal processing such as conversion of the output signal from the image sensor 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 an image signal 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 an operation state of the user input unit 86 and a photographed image.

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

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

The input unit 86 outputs an instruction input signal corresponding to the operation by the user to the CPU 85.

The lens drive control unit 87 controls a motor (not shown) that drives the

lens groups

5, 5,... Based on a control signal from the CPU 85.

The memory 88 is a semiconductor memory that can be attached to and detached from a slot connected to the R / W 84, for example. Note that the memory 88 may not be detachable from the slot but may be incorporated in the imaging apparatus 100.

Hereinafter, the operation of the imaging apparatus 100 will be described.

In the standby state for shooting, under the control of the CPU 85, the shot image signal is output to the display unit 83 via the camera signal processing unit 81 and displayed as a camera through image. 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 a predetermined lens group 5 is controlled based on the control of the lens drive control unit 87. Moved.

When shooting is performed by an instruction input signal from the input unit 86, the captured image signal is output from the camera signal processing unit 81 to the image processing unit 82, subjected to compression coding processing, and converted into digital data of a predetermined data format. Is done. The converted data is output to the R / W 84 and written to the memory 88.

Focusing is performed by the lens drive control unit 87 moving a predetermined lens group 5 based on a control signal from the CPU 85.

When the image data recorded in the memory 88 is reproduced, predetermined image data is read from the memory 88 by the R / W 84 in accordance with an operation on the input unit 86, and decompression decoding processing is performed by the image processing unit 82. Then, the reproduced image signal is output to the display unit 83 to display the reproduced image.

In the present technology, “imaging” refers to conversion from a photoelectric conversion process that converts light captured by the image sensor 204 into an electrical signal, to a digital signal for an output signal from the image sensor 204 by the camera signal processing unit 81. Processing such as noise removal, image quality correction, conversion to luminance / color difference signals, compression / decompression 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 , A process including only a part or all of a series of processes up to the process of writing the image signal to the memory 88 by the R / W 84.

That is, “imaging” may refer only to a photoelectric conversion process that converts light captured by the image sensor 204 into an electrical signal, and from a photoelectric conversion process that converts light captured by the image sensor 204 into an electrical signal. The camera signal processing unit 81 may refer to processing such as conversion of an output signal from the image sensor 204 to a digital signal, noise removal, image quality correction, and conversion to a luminance / color difference signal, and the like. Through processing such as conversion from photoelectric conversion processing for converting light into electrical signals to digital signals output from the image sensor 204 by the camera signal processing unit 81, noise removal, image quality correction, conversion to luminance / color difference signals, etc. The image processor 82 performs compression encoding / decompression processing of image signals based on a predetermined image data format, and changes in data specifications such as resolution. The process may be referred to as processing, conversion from photoelectric conversion processing for converting light captured by the image sensor 204 into an electrical signal, conversion of an output signal from the image sensor 204 by the camera signal processing unit 81 to a digital signal, noise removal, image quality Pointing through corrections, conversion to luminance / color difference signals, etc., and compression / decompression 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 Alternatively, it may indicate the processing up to the writing of the image signal to the memory 88 by the R / W 84.において In the above processing, the order of each processing may be changed as appropriate.

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 processing. May be.

Further, the lens barrel 1 may be configured to include a part of the image sensor 204, the camera signal processing unit 81, the image processing unit 82, and the R / W 84, and the apparatus main body 200 to include the rest.

<Technology>
The present technology may be configured as follows.

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

A yoke extending in the optical axis direction;
A movable coil that is inserted in the yoke and fixed to the movable body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the movable coil;
The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces,
The moving 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,
The drive device in which the arrangement direction of the yoke and the pair of magnets is the circumferential direction of the cylindrical portion.

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

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

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

(5)
The drive device according to any one of (1) to (4), wherein the yoke, the movable coil, and the pair of magnets are positioned on an outer peripheral portion in an internal space of the cylindrical portion.

(6)
A frame-shaped outer yoke is disposed at a position surrounding the movable 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 magnet is attached to each of the pair of side yoke portions,
The drive 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 drive device according to any one of (1) to (6), wherein a maximum area of a cross section perpendicular to the optical axis of the yoke is set to 5% or more of a total area of the magnetic flux generation surfaces of the pair of magnets.

(8)
The drive device according to any one of (1) to (7), wherein at least a part of a cross section of the yoke in a direction orthogonal to the optical axis direction is formed in a circular shape.

(9)
The drive device according to (8), wherein the movable coil is formed in a cylindrical shape.

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

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

(12)
The drive device according to any one of (9) to (11), wherein the magnetic flux generation surface is formed in a circular arc shape along an outer peripheral surface of the movable coil.

(13)
A cylindrical portion whose axial direction is the optical axis direction;
A movable 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 cylindrical portion;
A driving device for applying a driving force for moving the moving body in the optical axis direction;
The driving device includes:
A yoke extending in the optical axis direction;
A movable coil that is inserted in the yoke and fixed to the movable body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the movable coil;
The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces,
A lens barrel in which an arrangement direction of the yoke and the pair of magnets is set to a 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 for guiding the moving body in the optical axis direction are provided,
The lens barrel according to (14), wherein the two guide shafts are positioned substantially on opposite sides of the lens.

(16)
The lens barrel according to (15), wherein the one guide shaft, the one drive device, the other guide shaft, and the other drive device are sequentially arranged at substantially equal intervals in the circumferential direction.

(17)
A lens barrel that captures an optical image and an image sensor 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 movable 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 cylindrical portion;
A driving device for applying a driving force for moving the moving body in the optical axis direction;
The driving device includes:
A yoke extending in the optical axis direction;
A movable coil that is inserted in the yoke and fixed to the movable body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the movable coil;
The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces,
An imaging apparatus in which an arrangement direction of the yoke and the pair of magnets is set to a 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 for guiding the moving body in the optical axis direction are provided,
The imaging device according to (18), wherein the two guide shafts are positioned on substantially opposite sides of the lens.

(20)
The imaging device according to (19), wherein the one guide shaft, the one driving device, the other guide shaft, and the other driving device 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 ... 1st guide shaft, 12 ... 2nd guide shaft, 13 ... Moving body , 14 ... Lens holding frame, 19 ... Fixing part, 21 ... Fixing part, 25 ... Driving device, 26 ... Outer yoke, 27 ... Yoke, 28 ... Driving coil, 29 ... Magnet, 29a ... Magnetic flux generating surface, 30 ... Side yoke Part, 31 ... bottom yoke part

Claims

Giving a driving force in the optical axis direction to a moving body having at least one lens and a lens holding frame for holding the lens;
A yoke extending in the optical axis direction;
A movable coil that is inserted in the yoke and fixed to the movable body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the movable coil;
The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces,
The moving 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,
The drive device in which the arrangement direction of the yoke and the pair of magnets is the circumferential direction of the cylindrical portion.
The drive device according to claim 1, wherein the cylindrical portion is formed in a substantially cylindrical shape.
When one end on the lens side of the magnetic flux generation surface in the radial direction of the lens is an inner end and one end on the opposite side of the lens is an outer end,
The drive device according to claim 2, wherein a distance between the inner ends of the pair of magnets on the magnetic flux generation surface is smaller than a distance between the outer ends.
The drive device according to claim 1, wherein the magnetic flux generation surface is positioned substantially parallel to a virtual plane including an optical axis.
The drive device according to claim 1, wherein the yoke, the movable coil, and the pair of magnets are positioned on an outer peripheral portion in an internal space of the cylindrical portion.
A frame-shaped outer yoke is disposed at a position surrounding the movable 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 magnet is attached to each of the pair of side yoke portions,
The drive device according to claim 1, wherein both ends of the yoke in the optical axis direction are attached to the pair of bottom yoke portions.
The drive device according to claim 1, wherein a maximum area of a cross section perpendicular to the optical axis of the yoke is 5% or more of a total area of the magnetic flux generation surfaces of the pair of magnets.
The drive device according to claim 1, wherein at least a part of a cross section of the yoke in a direction orthogonal to the optical axis direction is formed in a circular shape.
The drive device according to claim 8, wherein the movable coil is formed in a cylindrical shape.
The lens holding frame is provided with a fixed portion to which the movable coil is fixed by adhesion,
The drive device according to claim 9, wherein at least a part of the fixed portion is located in a space between the pair of magnets and the movable coil.
A plurality of the fixing portions are provided,
The drive device according to claim 10, wherein the plurality of fixed portions are provided at substantially equal intervals in the circumferential direction of the movable coil.
The drive device according to claim 9, wherein the magnetic flux generation surface is formed in a circular arc shape along an outer peripheral surface of the movable coil.
A cylindrical portion whose axial direction is the optical axis direction;
A movable 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 cylindrical portion;
A driving device for applying a driving force for moving the moving body in the optical axis direction;
The driving device includes:
A yoke extending in the optical axis direction;
A movable coil that is inserted in the yoke and fixed to the movable body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the movable coil;
The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces,
A lens barrel in which an arrangement direction of the yoke and the pair of magnets is set to a circumferential direction of the cylindrical portion.
Two driving devices are provided;
The lens barrel according to claim 13, wherein the two driving devices are positioned substantially on opposite sides of the lens.
Two guide shafts for guiding the moving body in the optical axis direction are provided,
The lens barrel according to claim 14, wherein the two guide shafts are positioned substantially on opposite sides of the lens.
The lens barrel according to claim 15, wherein the one guide shaft, the one driving device, the other guide shaft, and the other driving device are sequentially arranged at substantially equal intervals in the circumferential direction.
A lens barrel that captures an optical image and an image sensor 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 movable 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 cylindrical portion;
A driving device for applying a driving force for moving the moving body in the optical axis direction;
The driving device includes:
A yoke extending in the optical axis direction;
A movable coil that is inserted in the yoke and fixed to the movable body and movable in the optical axis direction along the yoke;
A pair of magnets positioned on both sides of the yoke and the movable coil;
The surfaces of the pair of magnets facing the movable coil are magnetic flux generation surfaces,
An imaging apparatus in which an arrangement direction of the yoke and the pair of magnets is set to a circumferential direction of the cylindrical portion.
Two driving devices are provided;
The imaging device according to claim 17, wherein the two driving devices are positioned substantially on opposite sides of the lens.
Two guide shafts for guiding the moving body in the optical axis direction are provided,
The imaging device according to claim 18, wherein the two guide shafts are positioned substantially on opposite sides of the lens.
The imaging apparatus according to claim 19, wherein the one guide shaft, the one drive device, the other guide shaft, and the other drive device are sequentially arranged at substantially equal intervals in the circumferential direction.