JP5299842B2 - Driving device and lens barrel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact lens barrel by providing a compact holding part for a movable part. <P>SOLUTION: A drive device (100) includes: a driven body (30); a cylindrical body (42) which is made of a non-magnetic material; a movable moving magnet (21) which is attached to the driven body (30) and located outside the cylindrical body (42); a plurality of coils for an electromagnet (22), which are arranged side by side in the axial direction of the cylindrical body inside the cylindrical body, for applying an electromagnetic force to the moving magnet; a center yoke (41) which is made of a magnetic material and arranged in the center area of the cylindrical body; and a means (10) which deforms the cylindrical body. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a driving device for driving an optical element such as a lens, and a lens barrel such as a camera or a video camera using the driving device.

In general, in the auto focus function and the zoom function, the position of an optical element such as a focus movable lens or a zoom movable lens is moved in the optical axis direction. Further, the shake correction apparatus moves an optical element such as a lens and an imaging element on a plane perpendicular to the optical axis direction. These driving devices have solved the requirement by using a linear driving device using a magnet and a coil which not only has a high driving speed but also has a high positional accuracy and high positional accuracy. According to the linear motor of Patent Document 1, a coil and a center core are arranged in a cylindrical pipe, and a movable magnet body is installed on the outer periphery of the pipe to provide a linear drive device that is less likely to break. ing. In addition, according to the linear motor of Patent Document 2, in a linear motor in which a coil is formed on an outer pipe having a larger outer diameter than the inner pipe, the inner pipe having a built-in magnet, By supplying a pressurized fluid between the inner periphery and the inner periphery, a small linear motor that does not require a guide mechanism is provided.
Japanese Patent No. 40688848 Japanese Patent No. 3952190

  However, imaging devices such as cameras and video cameras are required to be further reduced in size and weight in order to meet the demand for reduction in size and weight. According to the linear motor disclosed in Patent Document 1, the wiring connected to the encoder head is movable as the encoder for position measurement moves, although it can be formed more efficiently and more compactly than a plane-opposed type (flat bed type) linear motor. However, there is a possibility of contact unnecessary and disconnection. Moreover, according to the linear motor of Patent Document 2, a guide mechanism is unnecessary, the structure is simple, and the size can be reduced. However, two linear motors are required to cancel the moment in the rotation direction. It is difficult to reduce the size of the entire device. Further, the linear motor after moving the movable part to a predetermined position is subjected to feedback processing so as to maintain the arrangement at the predetermined position.

  In view of such circumstances, the present invention intends to realize a small lens barrel by providing a small movable portion holding portion. Furthermore, by providing a driving device that is difficult to contact and is not easily disconnected, a lens barrel that is stable even after long-time use is to be realized.

As means for solving the problems, the following configuration is provided.
A driving device according to a first aspect includes a driven body, a cylindrical body made of a non-magnetic material, a movable moving magnet attached to the driven body and having an outer side of the cylindrical body, and the moving magnet A plurality of electromagnet coils arranged side by side in the axial direction of the cylindrical body in order to give electromagnetic force, a center yoke made of a magnetic material and disposed in the central region of the cylindrical body, and a cylinder And means for deforming the shaped body.

  According to the drive device of the present invention, it is possible to provide a small drive device by providing the holding portion of the small movable part formed integrally. Further, since the connection wiring can be designed without moving and interfering with the movable part, a stable lens barrel can be provided even after long-time use.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<< First Embodiment >>
The magnetic drive device 100 is a drive device that can move an optical system such as a focus movable lens or a zoom movable lens in the optical axis direction (Y-axis direction).

<Overall structure>
FIG. 1A is a perspective view showing the configuration of the magnetic drive device 100 of this embodiment, and FIG. 1B is a YZ cross section at the optical axis center LC of the magnetic drive device 100 shown in FIG. FIG. In FIG. 1B, the tubular structure of the connection wiring 29 and the outer cylinder 42 shown in FIG.

  The main configuration of the magnetic drive device 100 includes a first drive unit 10, a second drive unit 20, a holder 30, a guide shaft 40, and a control unit 90.

  Two guide shafts 40 are provided, and a first guide shaft 40a and a second guide shaft 40b are provided. Both ends of the guide shaft 40 are fixed to a stationary frame such as a fixed barrel (not shown). The first guide shaft 40a is installed as a reference axis, and the holder 30 moves in the direction of the optical axis center LC (Y-axis direction) along the reference axis. The second guide shaft 40b is installed in order to prevent the holder 30 from moving in the rotational direction around the first guide shaft 40a.

  As shown in FIG. 1A, the first guide shaft 40 a has a drive unit of a first drive unit 10 and a second drive unit 20. The first guide shaft 40 a is provided with a tubular yoke 41 made of a magnetic material such as iron at the center thereof, and a connection wiring 29 is wired in a hollow portion (center portion) of the tubular yoke 41. As shown in FIG. 1B, the first coil 12 and the second coil 22 are disposed on the outer periphery of the yoke 41, and the outer periphery 42 is formed of a nonmagnetic material. Is formed. For this reason, since the connection wiring 29 is covered with the outer cylinder 42 and the first coil 12 and the second coil 22 are immobile, there is a low possibility that the coil is disconnected or short-circuited and does not interfere with other parts. .

  The second guide shaft 40 b is a guide for preventing movement in the rotational direction, and is constituted by an outer cylinder 42. The material of the outer cylinder 42 of the second guide shaft 40b need not be a non-magnetic material, and is preferably formed of a lightweight material that is difficult to deform. In the present embodiment, the first drive unit 10 and the second drive unit 20 are installed on the first guide shaft 40a, but a method of installing on the second guide shaft 40b may be used. Further, the second axis may be a cylindrical axis or a configuration that becomes a reference axis. Further, a plurality of first axes having the second axis as a reference axis and driving means may be provided to increase the thrust of the driving unit.

  The first drive unit 10 is composed of a first magnet 11 and a first coil 12, the second drive unit 20 is composed of a second magnet 21 and a second coil 22, and the yoke 41 is used in common. The first coil 12 and the second coil 22 are bonded and fixed to the yoke 41. A connecting wire 29 is provided in the hollow of the central portion formed in the tubular yoke 41, and the connecting wire 29 passes through a through hole (not shown) formed in the yoke 41 to the first coil 12 and the second coil 22, respectively. It is connected. In addition, in order to prevent the 1st coil 12, the 2nd coil 22, and the yoke 41 from short-circuiting, the outer periphery of the yoke 41 may be formed with resin, and does not need to be. Further, the connection wiring 29 may be installed in the gap between the yoke 41 and the outer cylinder 42.

  The first drive unit 10 is used as an electromagnetic actuator and causes the holder 30 to be in a self-holding state by deforming the outer cylinder 42. The second drive unit 20 is used as a linear motor, and is used as a drive device with high speed and high repeatability. The first magnet 11 of the first drive unit 10 is arranged in the outer cylinder 42, and the second magnet 21 of the second drive unit 20 is built in the holder 30 and arranged on the holder 30 side.

  The holder 30 is formed with two guide holes 33 parallel to the optical axis center LC into which the two guide shafts 40 are inserted. A space for housing the bearing 31 and the second magnet 21 is formed in the guide hole 33 of the first guide shaft 40a, and the bearing 31 and the second magnet 21 are respectively installed. The holder 30 and the guide shaft 40 can move smoothly and parallel to the optical axis center LC by the bearing 31. For this reason, the holder 30 can move to a predetermined position along the optical axis center LC when the second drive unit 20 built in the first guide shaft 40a is driven. A through hole is formed in the optical axis center LC portion of the holder 30, and an optical system lens 32 is provided. The lens 32 is provided with an optical system such as a focus movable lens or a zoom movable lens. Although not shown, a configuration may be adopted in which a plurality of holders 30 in which lenses 32 are installed on two guide shafts 40 are driven.

  The control unit 90 is installed in the main body portion of the imaging apparatus or is installed around the magnetic drive apparatus 100. The control unit 90 can control the first driving unit 10 and the second driving unit 20 based on the position information of the holder 30 to perform the movement of the holder 30 or a self-holding state (fixed). Details of the control unit 90 will be described later.

Next, the structures of the first drive unit 10 and the second drive unit 20 will be described.
<Structure of the first drive unit 10>
FIG. 2 is a perspective view showing the inner structure of the outer cylinder 42 of the first guide shaft 40a divided. 3 is a cross-sectional view of the first guide shaft 40a, FIG. 3 (a) shows the first guide shaft 40a before the deformation of the outer cylinder 42, and FIG. 3 (b) shows the first guide shaft 40 after the deformation of the outer cylinder 42. It is the figure which showed the guide shaft 40a.

Since the 1st drive part 10 and the 2nd drive part 20 are installed in the 1st guide shaft 40a, the 1st drive part 10 is demonstrated first.
As described above, the first guide shaft 40 a is formed by the common yoke 41, the first magnet 11, and the first coil 12. Two first coils 12 are installed on the yoke 41, the outer cylinder 42 is covered around the first coil 12, and the first magnet 11 is joined to the outer cylinder 42.

  As shown in FIG. 3A, both ends of the yoke 41 of the first guide shaft 40a are fixed to an immovable wall surface 45 such as a fixed barrel (not shown). One end (right side in FIG. 3) of the outer cylinder 42 is fixed to the wall surface 45, and the other end is not fixed. The first magnet 11 is bonded to one end that is not fixed.

  The first drive unit 10 generates a magnetic field due to the input current, and the first magnet 11 moves in the Y-axis direction. For example, the first drive unit 10 moves to the right side (+ Y-axis direction) in the drawing, thereby A force is applied from both ends, and the central portion swells to a shape shown in FIG. That is, the center part of the outer cylinder 42 swells, contacts the holder 30 or the second magnet 21, and increases the contact resistance, so that the holder 30 can be in a self-holding state. 3B, the first magnet 11 and the holder 30 are removed, and the deformation of the outer cylinder 42 is exaggerated for ease of explanation.

  The driving method of the first driving unit 10 is the same as the driving method of the electromagnetic actuator. The first drive unit 10 has both ends of a cylindrical first magnet 11 magnetized by S and N, and generates a magnetic field by flowing current through the two first coils 12. By attracting or repelling each other, the first magnet 11 can be moved in the Y-axis direction.

  In the present embodiment, the holder 30 is in a self-holding state by energizing and driving the first driving unit 10. On the other hand, in a state where no current is supplied (initial state), the outer cylinder 42 having the shape shown in FIG. 3B is used, and when the holder 30 needs to be moved, the first drive unit 10 is driven, One magnet 11 can be moved to the left side of the figure to make the holder 30 movable. In this case, in the imaging apparatus that is not turned on, the first guide shaft 40a can place the holder 30 in a self-holding state, and damage due to movement of the holder 30 can be prevented. In addition, since the imaging apparatus allows a current to flow through the first driving unit 10 only when the holder 30 needs to be moved, power saving can be achieved. It should be noted that the outer cylinder 42 used in the present embodiment is preferably formed thinner in the vicinity of the center than the end so that the center is more easily deformed than the end.

<Structure of the second drive unit 20>
As described above, the second drive unit 20 includes the yoke 41, the cylindrical second magnet 21, and the second coil 22. The second magnet 21 is bonded to the inside of the holder 30. FIG. 4 is a view illustrating a YZ cross section of the second drive unit 20 with the first guide shaft 40a as the center.

  The cylindrical second magnet 21 was magnetized to the S pole and the N pole along the Y-axis direction, and one magnet was arranged. In addition, the 1st magnet 11 can enlarge the intensity | strength of magnetic force by using a high performance neodymium magnet etc. as a magnet. Further, the first magnet 11 is not limited to an integrally molded magnet, and may be a magnet in which divided pieces are combined.

  The second coil 22 is formed by a three-phase connection of a U phase, a V phase, and a W phase that are wound around a yoke 41 in a cylindrical shape. In the present embodiment, for example, the U phase, the V phase, and the W phase are arranged from the left in the Y-axis direction in FIG. 4, and three sets of these are prepared and connected. The second coil 22 may be prepared as much as necessary for the moving distance, and the connection method may be not only three-phase connection but also three-phase connection or more or two-phase connection.

<Control of first driving unit 10 and second driving unit 20>
FIG. 5 is a diagram showing a control system of the fixed control system 91 and the drive control system 92 of the control unit 90. The control unit 90 includes a fixed control system 91 that controls the first drive unit 10 and a drive control system 92 that controls the second drive unit 20. The fixed control system 91 includes a first switch control unit 93, and the drive control system 92 includes a second switch control unit 94, a position detection calculation unit 95, and a three-phase command conversion control unit 96. First, the fixed control system 91 that controls the first drive unit 10 will be described, and the drive control system 92 that controls the second drive unit 20 will be described later.

  When there is an instruction to fix (self-hold) the holder 30 from the control unit 90, the fixed control system 91 of the control unit 90 notifies the first switch control unit 93 and turns on the switch SW0. When the switch SW0 is turned on, a current is passed from the current amplifier AP controlled by the fixed control system 91 to the first coil 12, the first magnet 11 is moved in the + Y-axis direction, and the holder 30 is fixed. Also, when an instruction to release the fixation is given from the control unit 90, the fixed control system 91 turns off the switch SW0 to cut off the current, or stops supplying the current after flowing a reverse current through the first coil 12. As a result, the first magnet 11 is moved in the −Y-axis direction, and the fixing (self-holding) of the holder 30 is released. The current amplifier AP for amplifying the current is provided with a series resistor R for sensing current for overcurrent protection, and the current amplifier AP is connected to the first switch controller 93.

  The control of the second drive unit 20 uses a drive control system 92 of the control unit 90. The drive control system 92 includes a second switch control unit 94, a position detection calculation unit 95, and a three-phase command conversion control unit 96. When there is an instruction to move to a predetermined position from the control unit 90, the position detection calculation unit 95 acquires the position information of the second magnet 21 from the detection result from the encoder 50 (described later), and reaches the desired position. Calculate distance and direction. The switch control unit 94 controls the selection logic of the second coil 22 to be controlled based on the calculation result. Specifically, the second switch control unit 94 performs on / off control of a plurality of switch units SW (from the switch SW1 to the switch SW9) connected to the second coil 22, and the currents Iu, Iv, and A magnetic field is generated by energizing Iw. Thereby, the control unit 90 can move the holder 30 connected to the second magnet 21 to a desired position. When a drive command voltage is given from the calculation result, the three-phase command conversion control unit 96 gives a three-phase command value to each current amplifier unit AP for the U phase, the V phase, and the W phase. Note that the control unit 90 may perform feedback processing based on the value of each detection unit as to whether the control unit 90 is disposed at a predetermined position.

  The current amplifier AP used in the drive control system 92 is also provided with a series resistor R that senses current for overcurrent protection, and the current amplifier AP is connected to the second switch controller 94.

  FIG. 6 illustrates on / off control by the second switch control unit 94. In FIG. 6, the switch SW number corresponding to the second coil 22 is shown in the column direction, and the distance La (unit: mm) of the drive unit 10 is shown in the row direction. The 2nd switch control part 94 is switching for every predetermined position with respect to the three-phase coil of each 2nd coil 22. FIG. In the table, ◯ indicates a state where the coil can be energized, and x indicates a state where the coil cannot be energized. Further, the second switch control unit 94 can monitor the power supply state, and when the power supply is stopped, each switch is cut off from the current amplifier, and all the switches are in a conductive state. As a result, the coil short mode is set, and the electromagnetic damper is generated in the second magnet 21 by the counter electromotive current generated by the relative movement between the second magnet 21 and the second coil 22, and the movement can be stopped. The stationary second magnet 21 at a predetermined position is fixed by using the first drive unit 10 to cut off the energization of the second drive unit 20. FIG. 6 shows a case where the coil pitch Pc of the second coil 22 arranged on the yoke 41 shown in FIG. 4 is designed to be 10 mm.

<Position detection device>
The second drive unit 20 needs to install the encoder 50 and acquire position information in order to place the second magnet 21 at a desired position. FIG. 7A shows a case where the encoder 50 is installed on the second guide shaft 40b, and FIG. 7B shows a case where the encoder 50 is installed on the first guide shaft 40a.

  When the encoder 50 is installed on the second guide shaft 40 b shown in FIG. 7A, one end of the second guide shaft 40 b is rotatably installed on the wall surface 45, and the other end is installed on the encoder 50. The encoder 50 is connected and fixed to the wall surface 45. A screw thread 51 is formed on the second guide shaft 40b, and a screw groove (not shown) that meshes with the screw thread 51 is formed on the holder 30 through which the second guide shaft 40b passes. As a result, the encoder 50 can rotate the second guide shaft 40b by moving the holder 30 in the Y-axis direction, generate a pulse according to the rotation amount, and measure the accurate rotation amount. Can be detected.

  When the encoder 50 is installed on the first guide shaft 40a shown in FIG. 7B, both ends of the yoke 41 of the first guide shaft 40a are fixed to the wall surface 45, and the first gear is connected to one end of the outer cylinder 42. 53 is installed, and the first magnet 11 of the first drive unit 10 is fixed to the other end. The outer cylinder 42 has a structure that can rotate around the yoke 41, and the outer cylinder 42 on the first gear 53 side cannot move in the Y-axis direction. The first guide shaft 40a is formed with a thread 51, and the holder 30 through which the first guide shaft 40a passes is formed with a thread groove (not shown) that meshes with the thread 51. In addition, a second gear 54 that meshes with the first gear 53 is installed, and the rotary shaft 55 is connected to the encoder 50. Thus, the encoder 50 can detect the accurate rotation amount by generating a pulse according to the rotation amount by rotating the outer cylinder 42 by the movement of the holder 30 in the Y-axis direction.

  Since the rotation angle detected by the encoder 50 varies depending on the pitch formed on the screw thread 51, the pitch information is registered in the position detection calculation unit 95 in advance. In addition, the amount of movement of the holder 30 per rotation of the screw thread 511 is increased by designing the lead angle of the screw thread 51 to be large.

<Structure of first torsion drive unit>
A first torsion drive unit 15 shown in FIG. 8A is a modification of the first drive unit 10 shown in FIG. The first torsional drive unit 15 is substantially the same as the configuration of the first drive unit 10 and is different in shape and operation direction. The first torsion drive unit 15 includes a first magnet 16 and a first coil 17. In the first drive unit 10, the first magnet 11 has moved in the Y-axis direction, but in the first torsion drive unit 15, the first magnet 16 is driven in the rotation direction about the Y-axis.

  FIG. 8B is a perspective view of the first torsion drive unit 15, in which the outer cylinder 42 is removed for easy understanding of the configuration. FIG. 8C is a view showing a configuration of an XZ cross section of the first torsion drive unit 15.

  The first magnet 16 of the first torsion drive unit 15 is formed in a rectangular shape, and is formed in a sector shape that matches the outer peripheral shape of the outer cylinder 42. Further, the first magnet 16 is magnetized to the S pole and the N pole in the outer peripheral direction of the outer cylinder 42 and bonded to the outer cylinder 42.

  The first coil 17 is formed by winding a flat coil in a rectangular shape and is bonded to the yoke 41 on the surface facing the first magnet 16. The connection wiring 29 to the first coil 17 travels through a central cavity formed in the yoke 41 and is connected to the control unit 90. As shown in FIG. 8C, a magnetic field is generated by feeding current to the first coil 17 and current flows, and attracts or repels the opposing first magnet 16 so that the first magnet 16 becomes Y. It can move in the direction of rotation about the axis. Since the outer cylinder 42 on the first torsion drive unit 15 side is not fixed to the wall surface 45, the outer cylinder 42 is twisted by the rotation of the bonded first magnet 16, and the shape of the outer cylinder 42 can be changed.

  Further, in a state where no power is supplied (initial state), the outer cylinder 42 swelled near the center as shown in FIG. 3B is used, and the first torsion drive unit 15 is driven to twist the outer cylinder 42. The bulge in the vicinity of the center can be removed, and the holder 30 can be moved. The torsional rotation of the outer cylinder 42 is driven by using the first torsion driving unit 15, but the end of the outer cylinder 42 may be rotated by using a motor and a gear.

<Outer cylinder shape>
The outer cylinder 42 used in this embodiment is formed with a thin outer cover thickness in the vicinity of the movement of the holder 30 so that the outer cylinder is easily deformed by the first driving unit 10 or the first torsion driving unit 15. However, the outer cylinder 61 shown in FIG. 9A, the outer cylinder 62 shown in FIG. 9B, and the outer cylinder 63 shown in FIG. 9C may be used.

  The outer cylinder 61 shown in FIG. 9A is cylindrical, and a spiral slit 65 is formed on the outer periphery thereof. The slit 65 may be formed through the outer cylinder 61 or as a groove. When a force in the rotation direction is applied to the Y axis, the outer diameter of the outer cylinder 61 changes, and the holder 30 can be fixed (self-holding) or released.

  The outer cylinder 62 shown in FIG. 9B is cylindrical, and a linear slit 66 is formed on the outer periphery thereof. The slit 65 may be formed through the outer cylinder 62 or as a groove. When a force in the rotational direction and the Y-axis direction is applied to the Y-axis, the outer diameter of the outer tube 61 changes, and the holder 30 can be fixed (self-holding) or released.

  The outer cylinder 63 shown in FIG. 9C has a quadrangular prism shape, and two grooves 67 are formed on one surface of the outer peripheral surface thereof. The groove 67 may penetrate the outer cylinder 63. For example, in FIG. 9C, the first drive unit 10 is installed at one end (the left side of the drawing) of the outer cylinder 63. The yoke 41 is formed in, for example, a quadrangular prism shape, and the rectangular first coil 12 is formed by winding a coil around the yoke 41, and the rectangular first magnet 11 is installed between the two grooves 67. When the first drive unit 10 is driven, the first magnet 11 moves in the Y-axis direction, and the outer cylinder 63 sandwiched between the two grooves 67 is deformed. Thus, the magnetic drive device 100 may not be formed in a cylindrical shape. In addition, by forming the magnet joint 68 of the ferromagnetic material in the outer cylinder 63 sandwiched between the two grooves 67, the outer cylinder 63 normally contacts the second magnet 21 and the holder 30 (see FIG. 1). ) Is fixed (self-holding), and when deformed, the magnet joint 68 is separated from the second magnet 21 so that the holder 30 can be moved.

  With the above configuration, the magnetic drive device 100 can incorporate the holder fixing portion and the position detection device in the same configuration, and thus can be reduced in size and weight. Further, since the connection wiring 29 is arranged in the guide shaft, it can be fixed and routed without contact with the movable part, and thus the magnetic drive device 100 can be stably operated even for a long time use. it can.

<< Second Embodiment >>
In the first embodiment, an optical system such as a focus movable lens or a zoom movable lens is moved in the optical axis direction (Y-axis direction). The magnetic drive device 200 of the present embodiment is moved in a direction (X-axis direction and Z-axis direction) intersecting the optical axis direction (Y-axis direction) and used as, for example, a camera shake prevention mechanism. FIG. 10 is a perspective view showing the configuration of the magnetic drive device 200. In this embodiment, a lens shift type camera shake prevention mechanism in which a camera shake correction lens 232 for optical system correction is installed in the holder 230 is shown. However, by installing a sensor as an image sensor in the holder 230, a sensor shift system is provided. Can be formed. Hereinafter, the magnetic drive device 200 in which an optical lens is installed in the holder 230 will be described as a representative.

  The main configuration of the magnetic drive device 200 is a configuration in which one magnetic drive device 100 shown in the first embodiment is installed in each of the X-axis direction and the Z-axis direction. In the position detection device, a non-contact type position detection device is used. The reason for using a non-contact type position detecting device is that the holder 230 needs to move at high speed in the anti-shake mechanism, so that it is necessary to measure the position and distance at high speed, and high repeatability is required. Therefore, a non-contact type position detection device without a contact is used. Note that the same parts and mechanisms used in the present embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  The magnetic drive device 200 includes an X-axis magnetic drive device 250 in the X-axis direction, a Z-axis magnetic drive device 260 in the Z-axis direction, a holder 230, and a control unit 90. The X-axis magnetic drive device 250 has two X guide shafts 211 parallel to the X axis installed on a fixed frame 210 installed parallel to the Z axis, and is movable in the X axis direction with the X guide shaft 211 as an axis. A frame 212 is installed. In the Z-axis magnetic drive device 260, two Z guide shafts 213 parallel to the Z axis are installed on a moving frame 212, and a holder 230 that can move in the Z-axis direction about the Z guide shaft 213 is installed. A through-hole is formed in the center of the holder 230, and a camera shake correction lens 232 is installed therein. The fixed frame 210 is provided with an X-axis position detector 240 that detects a position in the X-axis direction, and the moving frame 212 is provided with a Z-axis position detector 241 that detects a position in the Z-axis direction. The X-axis position detector 240 and the Z-axis position detector 241 use an optical detector such as a laser, for example, and can detect the position without contact with the movable body.

  The X-axis position detector 240 is formed by being joined to the fixed frame 210, and the Z-axis position detector 241 is formed by being joined to the moving frame 212. The X-axis position detector 240 has an X-axis encoder scale 245 disposed on the opposing surface on the moving frame 212, and the Z-axis position detector 241 has a Z-axis encoder scale 246 disposed on the opposing surface on the holder 230. ing. The X-axis position detector 240 and the Z-axis position detector 241 can measure an accurate position by detecting the position reflected on each encoder scale.

  The X-axis magnetic drive device 250 is provided with the first drive unit 10 and the second drive unit 20 shown in FIG. 1, and inside one X guide shaft 211, the yoke 41, the first coil 12, The second coil 22 is incorporated, and the first magnet 11 is connected to the outer cylinder of the X guide shaft 211. Further, the second magnet 21 is built in the moving frame 212, and the moving frame 212 can move in the X-axis direction.

  Similarly, the first drive unit 10 and the second drive unit 20 shown in FIG. 1 are also installed in the Z-axis magnetic drive device 260, and the yoke 41 and the first drive unit 213 are placed inside one Z guide shaft 213. The coil 12 and the second coil 22 are built in, and the first magnet 11 is connected to the outer cylinder of the Z guide shaft 213. Further, the second magnet 21 is built in the holder 230, and the holder 230 can move in the Z-axis direction. That is, the holder 230 can move to an arbitrary position at high speed by controlling the ZX plane by the X-axis magnetic drive device 250 and the Z-axis magnetic drive device 260.

  The control unit 90 controls the X-axis magnetic drive device 250 and the Z-axis magnetic drive device 260 based on information from an angular velocity sensor (not shown) that detects vibrations in the left-right direction and the up-down direction, and controls the holder 230 as a light beam. The blur of the optical system is removed by moving a predetermined amount in the direction of removing the vertical and horizontal vibration directions with respect to the axial direction.

  As shown above, the magnetic drive device can be fixed (self-holding) of the mover and the drive unit on the same guide shaft, so the outer shape of the magnetic drive device can be reduced in size and connected. Since it can be designed so as not to interfere with the wiring, it is possible to provide an imaging device that can withstand downsizing and use for a long time.

FIG. 2A is a perspective view showing the configuration of the magnetic drive device 100. FIG. (B) is a YZ sectional view at the optical axis center LC of the magnetic drive device 100 shown in (a). It is the perspective view which divided | segmented the outer cylinder 42 of the 1st guide shaft 40a, and showed the internal structure. (A) is a cross-sectional configuration diagram showing the first guide shaft 40a before deformation of the outer cylinder 42. FIG. FIG. 4B is a cross-sectional configuration diagram illustrating the first guide shaft 40a after the outer cylinder 42 is deformed. FIG. 6 is a diagram illustrating a YZ cross section of the second drive unit 20 around the first guide shaft 40a. 3 is a diagram illustrating a control system of a fixed control system 91 and a drive control system 92 of a control unit 90. FIG. The on / off control by the second switch control unit 94 is illustrated. (A) shows the case where the encoder 50 is installed in the 2nd guide shaft 40b, and is a multi figure. (B) is the figure which showed the case where the encoder 50 was installed in the 1st guide shaft 40a. FIG. 6A is a diagram illustrating a first torsion drive unit 15 that is a modification of the first drive unit 10. FIG. 4B is a perspective view of the first torsion drive unit 15. (C) is a view showing a configuration of an XZ cross section of the first torsion drive unit 15. (A) is the figure which showed the outer cylinder 61, (b) is the figure which showed the outer cylinder 62, (c) is the figure which showed the outer cylinder 63. 2 is a perspective view showing a configuration of a magnetic drive device 200. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... 1st drive part, 15 ... 1st torsion drive part 11, 16 ... 1st magnet 12, 17 ... 1st coil 20 ... 2nd drive magnet 21 ... 2nd magnet 22 ... 2nd coil 29 ... Connection wiring 30 ... Holder 31 ... Bearing 32 ... Lens 33 ... Guide hole 40 ... Guide shaft (40a ... First guide shaft, 40b ... Second guide shaft)
41 ... Yoke 42, 61, 62, 63 ... Outer cylinder 45 ... Wall surface 50 ... Encoder 51 ... Thread 53 ... First gear 54 ... Second gear 55 ... Rotating shaft 65 ... Spiral slit, 66 ... Linear slit, 67 ... Groove 68 ... Magnet joint 90 ... Control part (91 ... Fixed control system, 92 ... Drive control system)
93 ... 1st switch control part 94 ... 2nd switch control part 95 ... Position detection calculating part 96 ... 3 phase command conversion control part 100, 200 ... Magnetic drive device 210 ... Fixed frame 211 ... X guide shaft 212 ... Moving frame 213 ... Z guide shaft 230 ... Holder 232 ... Correction lens 240 ... X axis position detector 241 ... Z axis position detector 245 ... X axis encoder scale 246 ... Z axis encoder scale 250 ... X axis magnetic drive device 260 ... Z axis magnetic drive device AP ... Current amplifier LC ... Optical axis center R ... Series resistance SW ... Switch

Claims (6)

A cylindrical body made of a non-magnetic material;
A driven body having a guide hole into which the cylindrical body is inserted, and movable along the cylindrical body;
A movable magnet attached to the driven body and provided on the outside of the cylindrical body;
A plurality of electromagnet coils arranged side by side in the axial direction of the cylindrical body inside the cylindrical body in order to apply electromagnetic force to the moving magnet;
A center yoke made of a magnetic material and disposed in the central region of the cylindrical body;
A deforming coil disposed on the center yoke and a deforming magnet mounted on the cylindrical body, and the driven body is deformed by deforming the cylindrical body with the deforming coil and the deforming magnet. Holding means for holding the body ;
A drive device comprising: Detecting means for detecting a rotation angle of the cylindrical body;
The drive device according to claim 1 , wherein the rotation angle detected by the detection unit corresponds to position information of the moving magnet. It said holding means include a drive device according to claim 1 or claim 2, characterized in that to increase the contact resistance between the outer surface and the inner surface of the moving magnet of the tubular body. A ferromagnetic body is attached to a deformable portion of the cylindrical body, and the moving magnet is in contact with the ferromagnetic body. When the moving magnet is fixed, the moving magnet and the ferromagnetic body 4. The driving device according to claim 1 , wherein when the moving magnet moves, the holding unit separates the ferromagnetic body from the moving magnet. 5. A lens barrel that drives a movable lens along the axis of the barrel,
The driven body has a movable lens disposed in the lens barrel,
A lens barrel having the driving device according to any one of claims 1 to 4 therein. When the holding means deforms the cylindrical body, the movable lens becomes movable, and when the holding means does not deform the cylindrical body, the movable lens is in a self-holding state. The lens barrel according to claim 5 .