JP2006091340A - Lens driving device, imaging apparatus and optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the backlash of a moving barrel, in a lens driving device equipped with: a moving barrel in which a moving lens is incorporated; a guide means which regulates rotation in the peripheral direction of the moving barrel and holds the moving barrel to freely slide in its shaft direction; and a rotating barrel which is engaged with the moving barrel and rotates to move the moving barrel forward and backward in the shaft direction, and also in an imaging apparatus and an optical device. <P>SOLUTION: The lens device 31 is provided with the moving barrel 40, a guide ring 38 and a spring 80. The moving barrel 40 is equipped with a projection 54 engaged with the guide groove 58 of the guide ring 38, and moves to slide along the guide groove 58. The coil spring 80 whose one end is attached to the moving barrel 40 and whose other end is attached to the guide ring 38 respectively is arranged to surround the outer periphery of the moving barrel 40. The coil spring 80 is formed so that its diameter may be smaller and its length may be longer than the front part 50 of the moving barrel 40, twisted in a reverse direction to be rewound so that the diameter may be extended, and pushed from front and rear so that the length may be shortened, and then arranged in an elastically deformed state. Thus, the moving barrel 40 is energized in a forward direction side and a rear side by the recovery force of the coil spring 80, whereby it is moved without causing the backlash. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes a moving cylinder in which a moving lens is incorporated, guide means for restricting rotation of the moving cylinder in the circumferential direction, and holding the moving cylinder slidably in its axial direction, and the moving cylinder. The present invention relates to a lens driving device, an imaging device, and an optical device including a rotating cylinder that engages and rotates to move the moving cylinder back and forth in the axial direction.

  In recent years, an image pickup apparatus (digital camera) using a solid-state image pickup device such as a CCD image sensor or a CMOS image sensor has been incorporated into a small information terminal device such as a mobile phone or a PDA. A digital camera converts a subject image optically obtained by a photographic lens into an imaging signal by a solid-state imaging device, and electronically captures and records the image, thereby reducing the size of the solid-state imaging device and increasing the pixel density. Along with this, the shooting function has also been enhanced.

  Some digital cameras allow focus adjustment and zooming by moving a moving lens such as a focus lens or zoom lens. The lens driving device for moving the moving lens as described above includes a moving cylinder in which the moving lens is incorporated and a rotating cylinder engaged with the moving cylinder via a cam mechanism, and by rotating the rotating cylinder. In some cases, the moving lens is moved by moving the moving cylinder back and forth in the axial direction (for example, see Patent Document 1 below).

Further, in this lens driving device, a protrusion is formed on the outer periphery of the moving cylinder, and the protrusion is engaged with a guide groove provided in the camera body, whereby the moving cylinder is slid in the axial direction, and the lens is moved along with the movement. Does not rotate. By doing so, it is possible to prevent problems such as an image being shifted due to decentering of the lens during focus adjustment or zooming.
Japanese Patent Publication No.59-109007

  By the way, in the apparatus described in Patent Document 1, in order to move the moving lens smoothly, a cam mechanism for connecting the moving cylinder and the rotating cylinder between the protrusion of the moving cylinder and the guide groove of the camera body and to some extent is used. The gap is necessary. However, there is a problem in that the moving cylinder slightly moves due to the gap and becomes loose.

  It is an object of the present invention to provide a lens driving device, an imaging device, and an optical device that can prevent the moving cylinder from rattling.

  In order to achieve the above object, the lens driving device of the present invention includes a means for urging the movable cylinder in the circumferential direction so as to prevent fine movement of the movable cylinder in the circumferential direction, and an axial direction of the movable cylinder. And at least one of means for urging the movable cylinder in the axial direction so as to prevent the fine movement.

  The means for urging the movable cylinder in the circumferential direction and the means for urging the movable cylinder in the axial direction are arranged so as to surround the outer periphery of the movable cylinder, and one end moves to the apparatus main body and the other end moves. A coil spring that is attached to each of the cylinders and biases the moving cylinder in the circumferential direction by a restoring force in the torsion direction, and biases the moving cylinder in the axial direction by a restoring force in the axial direction is preferable. .

  Further, the lens driving device of the present invention is provided with urging means for urging the protrusion or groove of the moving cylinder toward the circumferential direction of the moving cylinder by a magnetic force and preventing the fine movement in the circumferential direction of the moving cylinder. It is characterized by. The urging means may be composed of an iron piece provided on one of the projection or groove and the guide means, and a magnet provided on the other. Further, the biasing means is disposed so as to be sandwiched between the iron pieces provided on both the protrusion or groove and the guide means, and has an axis perpendicular to the axis of the movable cylinder, You may comprise from the cylindrical magnet provided rotatably in the axial direction of a movement cylinder.

  A rotary stepping motor having a cylindrical magnet rotor and a stator disposed so as to surround the magnet rotor, and rotating the magnet rotor by a magnetic field formed on an inner periphery of the stator; Is preferably attached to the inner peripheral side of the magnet rotor and is driven to rotate by the stepping motor.

  In addition, an imaging apparatus of the present invention is characterized in that the moving lens is moved using the lens driving device described above. Furthermore, an optical device may be configured using the lens driving device.

  According to the present invention, since the movable cylinder is urged toward the circumferential direction to prevent the movable cylinder from being slightly rotated in the circumferential direction, it is possible to prevent the movable cylinder from rattling. Further, if the moving cylinder is urged in the axial direction, the moving cylinder can be prevented from rattling in the axial direction, so that the moving cylinder can be more reliably prevented from rattling.

  A camera-equipped mobile phone equipped with the imaging apparatus of the present invention will be described below. 1 and 2, the exterior of the camera-equipped mobile phone 10 is composed of a front cover 12 and a rear cover 14, and a circuit board on which various electronic components are attached is disposed between them.

  On the front side of the camera-equipped mobile phone 10, there are an operation unit 16 for performing various operations, a liquid crystal display panel (LCD) 18 for performing various displays, a reception speaker 20 and a transmission for use during a call. A microphone 22 is provided. On the back side of the camera-equipped mobile phone 10, a battery 24 for supplying power is detachably provided, and a lens device 31 constituting an imaging device 30 (see FIG. 7) is provided. The photographing lens 32 incorporated in the lens device 31 is exposed from the back side of the camera-equipped mobile phone 10.

  The camera-equipped mobile phone 10 has a call mode in which a call is made by the reception speaker 20 and the transmission microphone 22, and a camera mode in which subject light obtained through the photographing lens 32 is stored as digital image data in the built-in memory 34 (see FIG. 7). And switching between the modes can be performed by operating the operation unit 16. Further, by operating the operation unit 16, various operations such as inputting a telephone number in the call mode and shutter release in the camera mode can be performed. The LCD 18 displays an image stored in the built-in memory 34 and various information screens such as a menu screen. In addition, a so-called through image is displayed in the camera mode so that framing can be performed.

  As shown in FIGS. 3 and 4, the lens device 31 includes a guide ring 38, a moving cylinder 40, a rotating cylinder 42, and a fixed cylinder 44, and a photographing lens 32 is incorporated in the moving cylinder 40. The photographing lens 32 is a moving lens, and includes a first lens 32a, a second lens 32b, and a third lens 32c. The photographing lens 32 refracts the subject light incident along the optical axis 46 by the first to third lenses 32a, 32b, and 32c and forms an image on the light receiving surface of the CCD 48 disposed behind the lens device 31. . Although details will be described later, in the present embodiment, the photographing lens 32 is moved by moving the movable barrel 40 to adjust the focus.

  The moving cylinder 40 has a stepped shape with different outer diameters at the front part 50 on the subject side and the rear part 52 on the CCD 48 side. Two protrusions 54 are formed at the front end of the front portion 50, and a male helicoid 56 is formed along the outer periphery of the rear portion 52. A guide ring 38 is disposed at the front portion 50 of the movable barrel 40, and a rotating barrel 42 is disposed at the rear portion 52.

  The guide ring 38 is disposed so as to surround the outer periphery of the movable barrel 40 and is fixed to the rear case 14 of the camera-equipped mobile phone 10. Two guide grooves 58 that engage with the two protrusions 54 are formed on the inner periphery of the guide ring 38. The movable cylinder 40 is restricted from rotating in the circumferential direction by the guide ring 38 and is slidably held in the direction of the optical axis 46. The inner circumference of the guide ring 38 including the two guide grooves 58 is formed slightly larger than the outer circumference of the movable cylinder 40 including the two protrusions 54 so that the movable cylinder 40 can slide smoothly.

The rotating cylinder 42 is disposed so as to surround the outer periphery of the rear portion 52 of the moving cylinder 40, and a female helicoid 60 that engages with the male helicoid 56 of the moving cylinder 40 is formed on the inner periphery of the rotating cylinder 42.
The rotating cylinder 42 and the moving cylinder 40 are connected by a helicoid feeding mechanism composed of helicoids 56 and 60. Then, by rotating the rotating cylinder 42, the moving cylinder 40 slides in the direction of the optical axis 46 along the guide groove 58 of the guide ring 38. By rotating the rotating cylinder 42 clockwise (forward direction) when viewed from the subject side, the moving cylinder 40 moves forward, and the rotating cylinder 42 is rotated counterclockwise (reverse direction) when viewed from the object side. Thus, the movable cylinder 40 moves backward.

  The rotating cylinder 42 constitutes a claw pole type hollow stepping motor together with the fixed cylinder 44. Therefore, as shown in FIG. 5, a cylindrical magnet 42 a that alternately forms N poles and S poles along the circumferential direction is provided on the outer periphery of the rotating cylinder 42. By doing so, the rotating cylinder 42 functions as a rotor (rotor) of the hollow stepping motor, and is driven to rotate by the magnetic field formed on the inner periphery of the fixed cylinder 44.

  On the other hand, the fixed cylinder 44 is disposed further outside the rotary cylinder 42, is fixed to the main body of the camera-equipped mobile phone 10, and functions as a stator (stator) of the hollow stepping motor. The fixed cylinder 44 includes a first coil portion 64 and a second coil portion 68 each having a coil provided therein.

  The first coil unit 64 is a coil that is housed in a yoke that is made of a magnetic material such as iron. A substantially rectangular wave gap is formed in the yoke, and teeth 64 a and 64 b that mesh with each other are formed on the inner periphery of the first coil portion 64 by the gap.

  When the first coil part 64 is energized in the forward direction (clockwise in the figure), concentric magnetic field lines centered on the current are generated in the coil (so-called right-handed screw law). The generated lines of magnetic force try to pass through the inside of the yoke formed of a magnetic material, and are temporarily released into the air when reaching the teeth 64b. The released magnetic field lines cross the gap and enter the yoke again from the teeth 64a. As a result, an S-pole magnetic field is formed on the teeth 64a and an N-pole magnetic field is formed on the teeth 64b. On the other hand, if the first coil portion 64 is energized in the opposite direction (counterclockwise in the figure), the flow of magnetic field lines is reversed, so that a magnetic field of N pole is formed on the tooth 64a and S magnetic field is formed on the tooth 64b. Is done.

  Similarly, teeth 68a and 68b are formed on the inner circumference of the second coil portion 68, and the second coil portion 68 is energized in the forward direction so that the teeth 68a become the S pole and the teeth 68b become the N pole. By energizing in the reverse direction, the teeth 68a are converted to the N pole and the teeth 68b are changed to the S pole. Further, the first coil portion 64 and the second coil portion 68 are arranged so that the positions of the teeth 68a and 68b of the second coil portion 68 are half the teeth with respect to the positions of the teeth 64a and 64b of the first coil portion 64. They are arranged in a shifted state.

  When rotating the rotating cylinder 42 in the forward direction, first, the first coil portion 64 is energized in the forward direction as shown in FIG. The first coil portion 64 energized in the forward direction turns the teeth 64a into S poles and the teeth 64b into N poles, and attracts each of the magnetic poles forming a pair of the rotating cylinders 42. Next, as shown in FIG. 5B, the second coil portion 68 is energized in the forward direction. Since the positions of the teeth 68a and 68b of the second coil portion 68 are shifted by a half of the teeth relative to the positions of the teeth 64a and 64b of the first coil portion 64, the teeth 68a of the second coil portion 68 having a magnetic pole. , 68b, the rotary cylinder 42 rotates in the forward direction by half a tooth.

  Similarly, as shown in FIG. 5C, after the first coil portion 64 is energized in the reverse direction, the reverse direction is applied to the second coil portion 68 as shown in FIG. The rotating cylinder 42 rotates in the forward direction by energizing and returning to the procedure of FIG. On the other hand, when rotating the rotating cylinder 42 in the reverse direction, the forward direction is directed to the first coil part 64, the reverse direction is directed to the second coil part 68, the reverse direction is directed to the first coil part 64, and the forward direction is directed to the second coil part 68. , The rotating cylinder 42 rotates in the reverse direction.

  As described above, in the lens device 31, the hollow cylinder 42 and the stationary cylinder 44 constitute a hollow stepping motor, so that space efficiency is good and miniaturization is possible. Of course, a gear connected to a motor may be used instead of the fixed cylinder 44, and a gear train meshing with the gear may be provided on the outer periphery of the rotating cylinder 42, and the rotating cylinder 42 may be rotated by controlling the rotation of the motor. Good.

  However, in such a lens device 31, as described above, between the projection 54 of the moving cylinder 40 and the guide groove 58 of the guide ring 38, and the male helicoid 56 of the moving cylinder 40 and the female helicoid of the rotating cylinder 42. Since there is a gap between the moving cylinder 40 and the moving cylinder 40, there is a problem that the moving cylinder 40 is slightly moved and rattled. In order to prevent this problem, the lens device 31 is provided with a coil spring 80.

  The coil spring 80 is formed by bending so that both the front end portion 80a and the rear end portion 80b are parallel to the optical axis 46, and the front end portion 80a is fitted into a holding hole 82 provided in the rear end surface of the guide ring 38, Further, the rear end portion 80 b is fitted into a holding hole 84 provided in a stepped portion of the movable cylinder 40 and is disposed so as to surround the front portion 50 of the movable cylinder 40.

  Further, the coil spring 80 is formed so that its diameter is slightly smaller than that of the front portion 50 of the movable cylinder 40 and its length is long. The coil spring 80 is twisted in the opposite direction so as to be rewound, the diameter thereof is expanded, and the coil spring 80 is pressed from the front and rear to shorten the length, and is arranged in an elastically deformed state. Thereby, the movable cylinder 40 is biased forward and rearward by the restoring force of the coil spring 80.

  FIG. 7 is a functional block diagram showing an electrical configuration of the imaging device 30 using the lens device 31 having the above configuration. The imaging device 30 includes a system controller 90 configured by a microcomputer in order to perform overall control of each unit. The system controller 90 is connected to each unit of the imaging device 30 via the data bus 92 and controls the operation of each unit connected in response to an input operation from the operation unit 16.

  As is well known, the CCD 48 disposed behind the lens device 31 has a large number of photoelectric conversion elements arranged on the light receiving surface, and photoelectrically converts the subject light imaged by the photographing lens 32 and obtains it as an imaging signal. To do. When the camera-equipped mobile phone 10 is switched to the camera mode, the system controller 90 drives the CCD 48 to acquire an imaging signal.

  Imaging signals sequentially output from the CCD 48 are amplified to an appropriate level by a variable gain type preamplifier 94 and converted into digitized image data by an A / D converter 96. The image data obtained in this way is sequentially written into the frame memory 98. The frame memory 98 is a working memory for the image data processing circuit 100 and the AF control unit 102 to perform various image processes on the image data, and temporarily stores the image data.

  The image data processing circuit 100 performs known image processing such as gamma correction, white balance correction, and image quality correction on the image data stored in the frame memory 98. The image data subjected to the respective image processing by the image data processing circuit 100 is displayed as a through image on the LCD 18 via the LCD driver 104 or recorded in the built-in memory 34 via the memory controller 105.

  The AF control unit 102 performs focus adjustment based on the image data stored in the frame memory 98. The AF control unit 102 controls the energization of the first and second coils 62 and 66 provided in the fixed cylinder 44 of the lens device 31 to move the moving cylinder 40, and the photographing incorporated in the moving cylinder 40. The focus is adjusted by adjusting the position of the lens 32. The AF control unit 102 detects the position of the photographic lens 32 where the contrast component of the image data obtained while moving the photographic lens 32 back and forth is the highest as a focus position with a high degree of focus, and shoots to the detected focus position. The lens 32 is moved. This completes the focus adjustment.

  The operation of the present invention having the above configuration will be described below. When the camera-equipped mobile phone 10 is set to the camera mode, acquisition of an imaging signal by the CCD 48 is started. The AF control unit 102 performs focus adjustment based on the acquired image data. In focus adjustment, the rotating cylinder 42 is rotated by energizing the first and second coils 62 and 66 of the fixed cylinder 44. The moving cylinder 40 is connected to the rotating cylinder 42 via helicoids 56, 60, and the moving cylinder 40 moves along the guide groove 58 provided in the guide ring 38 as the rotating cylinder 42 rotates. It is slid in the direction.

  Since the moving cylinder 40 is urged in the forward direction by the coil spring 80, the state in which the protrusion 54 is in contact with the side wall on the forward direction side of the guide groove 58 is maintained. As a result, the movable cylinder 40 is not rattled in the circumferential direction. Further, since the movable cylinder 40 is also urged to the rear side (CCD 48 side) in the direction of the optical axis 46 by the coil spring 80, the movable cylinder 40 is slightly moved back and forth by the gap between the helicoids 56 and 60 and may be rattled. Absent.

  Thus, according to the present invention, it is possible to prevent the moving cylinder from rattling by urging the moving cylinder. Moreover, since the moving cylinder is urged in the circumferential direction and the axial direction by one coil spring, it is possible to efficiently prevent the moving cylinder from rattling.

  In the above embodiment, the example in which the moving cylinder is urged in the forward direction has been described. However, the moving cylinder may be urged in the reverse direction. Further, the example has been described in which the protrusion is provided on the movable cylinder and the guide groove is provided on the guide ring, but the guide groove may be provided on the movable cylinder and the protrusion may be provided on the guide ring.

  In the above embodiment, the example in which the moving cylinder is urged by the coil spring has been described. However, the moving cylinder may be urged by using a spring other than the coil spring. It is also conceivable that the moving cylinder is urged by a magnetic force without using a spring. In this case, for example, as shown in FIG. 8, a protrusion made of a plastic magnet 111 is provided on the moving cylinder 110, and an iron plate 114 is disposed on the forward side wall of the guide groove 113 provided in the guide ring 112. By doing so, the plastic magnet 111 is attracted to the iron plate 114, and the movable cylinder 110 is urged forward. Of course, an iron plate may be provided on the side wall of the protrusion, and a magnet may be provided on the side wall of the guide groove. Further, a magnet having the same polarity may be arranged on the side wall of the protrusion and the side wall of the guide groove, and the moving cylinder may be urged by utilizing the force of repulsion between the magnets.

  Furthermore, as shown in FIG. 9, both the protrusion 121 provided on the movable cylinder 120 and the protrusion 123 provided on the guide ring 122 may be attracted by a magnet 126. In this example, as shown in FIG. 5A, the projections 121 and 123 are provided with flat portions facing each other, the iron plate 124 is arranged on the flat portion of the projection 121, and the iron plate 125 is arranged on the flat portion of the projection 123. The magnet 126 is disposed between the iron plates 124 and 125. In this example, the magnet 126 has a cylindrical shape, and the side surface of the magnet 126 comes into contact with the iron plates 124 and 125 as shown in FIG. By doing so, the frictional resistance between the movable cylinder 120 and the guide ring 122 can be reduced, and the movable cylinder 120 can be moved smoothly.

  Further, a magnetizer that generates a magnetic force by energizing the coil may be used as the magnet. In this case, for example, as shown in FIG. 10, a magnet 131 in which one side wall 131 a is a magnetic pole and the other side wall 131 b is a magnetic pole is used as the protrusion of the movable cylinder 130. Further, instead of the guide groove, a substantially C-shaped magnetizer 133 is used so as to sandwich the protrusion 131 from both sides. Then, by energizing the magnetizing coil 134, one end 133a of the magnetizing machine 133 is converted to the N pole and the other end 133b is changed to the S pole. By doing so, the side walls 131a and 131b of the protrusion 131 and the end portions 133a and 133b of the magnetizing machine 133 repel each other, and the moving cylinder 130 is urged from both sides of the forward direction and the reverse direction. The backlash of 130 can be prevented.

  In the above-described embodiment, the example in which the moving cylinder and the rotating cylinder are connected by the helicoid feeding mechanism has been described, but the present invention is not limited to this. For example, the moving cylinder and the rotating cylinder may be connected by a cam mechanism formed of a cam pin formed on the moving cylinder and a cam groove formed on the rotating cylinder and engaged with the cam pin of the moving cylinder.

  In the above-described embodiment, an example in which the focus is adjusted by moving the moving cylinder has been described. However, zooming may be performed by moving the moving cylinder. Furthermore, two moving cylinders may be provided to perform both focus adjustment and zooming. In any of these cases, rattling when the moving cylinder moves can be prevented by urging the moving cylinder in the circumferential direction or the axial direction.

  In the embodiment described above, an example in which a CCD is used and focus adjustment is performed based on the contrast of an image formed on the light receiving surface has been described. However, instead of the CCD, for example, a light emitting unit and a light receiving unit are provided. And a distance measuring sensor that measures the distance from the time the light from the light emitting part is reflected by the irradiation target and enters the light receiving part to the irradiation target, and the distance to the subject is measured by the distance measuring sensor. The focus adjustment may be performed based on the measured distance.

  The digital camera built in the camera-equipped mobile phone has been described above as an example. However, the present invention is not limited to this, and a so-called silver-lead camera that records an image by printing a subject image on a photographic film. The present invention can also be applied to. Furthermore, the present invention can be widely applied to optical devices other than cameras, such as a projection device such as a projector, and a pickup lens device used when reading data recorded on a CD-ROM, DVD, or the like.

It is a perspective view of the front side of the mobile phone with a camera. It is a perspective view of the back side of the mobile phone with a camera. It is sectional drawing of a lens apparatus. It is a perspective view of a lens apparatus. It is explanatory drawing of the hollow stepping motor comprised from a rotating cylinder and a fixed cylinder. It is explanatory drawing showing the procedure of rotating a rotating cylinder to a forward direction. It is a block diagram of an imaging device. It is explanatory drawing showing the example which urged the movable cylinder with the magnetic force. It is explanatory drawing showing another example which urged the movable cylinder with magnetic force. It is explanatory drawing showing the further another example which biased the movable cylinder with the magnetic force.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Camera mobile phone 30 Imaging device 31 Lens apparatus 32 Shooting lens 38, 112, 122 Guide ring 40, 110, 120, 130 Moving cylinder 42 Rotating cylinder 42a Magnet 44 Fixed cylinder 56 Male helicoid 60 Female helicoid 64 First coil part 68 Second coil part 80 Spring 111, 126, 131 Magnet 114, 124, 125 Iron plate 133 Magnetizer

Claims (8)

A movable barrel in which a movable lens is incorporated; a guide means for restricting rotation of the movable barrel in the circumferential direction; and holding the movable barrel slidably in its axial direction; and engaging the movable barrel; In a lens driving device including a rotating cylinder that rotates to move the moving cylinder back and forth in the axial direction,
Means for urging the movable cylinder in the circumferential direction so as to prevent fine movement in the circumferential direction of the movable cylinder, and shaft for moving the movable cylinder so as to prevent fine movement in the axial direction of the movable cylinder A lens driving device comprising at least one of means for urging in a direction.   The means for urging the movable cylinder in the circumferential direction and the means for urging the movable cylinder in the axial direction are arranged so as to surround the outer circumference of the movable cylinder, and one end is connected to the apparatus main body, the other Ends are respectively attached to the movable cylinders, and the movable cylinder is biased in the circumferential direction by a restoring force in the torsion direction, and the movable cylinder is biased in the axial direction by a restoring force in the axial direction. The lens driving device according to claim 1, wherein the lens driving device is a coil spring. By engaging a moving cylinder incorporating a moving lens and a protrusion or groove formed on the moving cylinder, the rotation of the moving cylinder in the circumferential direction is restricted, and the moving cylinder is moved in the axial direction. In a lens driving device comprising: guide means for holding slidably; and a rotating cylinder that engages with the moving cylinder and rotates the moving cylinder back and forth in the axial direction.
A lens driving device comprising biasing means for biasing the protrusion or groove toward the circumferential direction of the movable cylinder by a magnetic force to prevent fine movement of the movable cylinder in the circumferential direction.   The lens driving device according to claim 3, wherein the urging unit includes an iron piece provided on one of the protrusion or groove and the guide unit, and a magnet provided on the other.   The biasing means is disposed so as to be sandwiched between the iron pieces provided on both the protrusion or groove and the guide means, and has an axis perpendicular to the axis of the movable cylinder, and the movement 4. The lens driving device according to claim 3, wherein the lens driving device comprises a cylindrical magnet provided so as to be rotatable in the axial direction of the cylinder. It has a cylindrical magnet rotor and a stator arranged so as to surround the magnet rotor, and includes a hollow stepping motor that rotates the magnet rotor by a magnetic field formed on the inner periphery of the stator,
The lens driving device according to claim 1, wherein the rotating cylinder is attached to an inner peripheral side of the magnet rotor and is rotationally driven by the stepping motor.   An imaging apparatus comprising the lens driving device according to claim 1. An optical device comprising the lens driving device according to claim 1.

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