JP2011027947A - Optical unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical unit equipped with a movable module driving mechanism for blur correction in a small space. <P>SOLUTION: In the optical unit 100, the movable module driving mechanism for blur correction 500 (X-side movable module driving mechanism 500x and Y-side movable module driving mechanism 500y) includes an electromagnet 530 and a permanent magnet 510 (member to be driven) on the side opposite to light incident and emitting sides of a movable module 300, and the electromagnet 530 and the permanent magnet 510 face each other in an optical axis direction. Besides, the electromagnet 530 is used, instead of driving force generated on the basis of Fleming's left-hand rule between a coil and the permanent magnet. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical unit mounted on a camera-equipped mobile phone or the like.

  An imaging optical unit mounted on a cellular phone or the like includes a moving body provided with a lens, a lens driving mechanism that magnetically drives the moving body in the optical axis direction, and an imaging unit in which an imaging element is supported on a support. I have. In such an optical unit for photographing, it is preferable to suppress the disturbance of the photographed image due to the hand shake of the user.

  On the other hand, in digital cameras and the like, a camera shake correction mechanism that drives the correction lens using a driving force generated based on Fleming's left-hand rule between a permanent magnet and a coil disposed near the center in the optical axis direction is proposed. (For example, refer to Patent Document 1).

JP 2009-144771 A

  However, as in the configuration described in Patent Document 1, the configuration in which the permanent magnet and the coil are arranged near the center in the optical axis direction and the configuration in which the correction lens is driven have a large camera shake correction mechanism around the movable module. Since it occupies space, there is a problem that it cannot be applied to an optical unit having a large demand for downsizing, such as an optical unit mounted on a mobile phone or the like.

  Such a problem is not limited to an optical unit for photographing provided with a camera shake correction mechanism, but is a problem common to all optical units that correct a camera shake or the like by swinging a movable module that holds an optical element. .

  In view of the above problems, an object of the present invention is to provide an optical unit in which a movable module drive mechanism for shake correction can be provided in a narrow space.

  In order to solve the above problems, in the present invention, a fixed body, a movable module that holds an optical element, an elastic member that is supported so as to be displaceable with respect to the fixed body, and the movable member An optical unit with a shake correction function, wherein the movable module drive mechanism is one of the movable module and the fixed body. An electromagnet provided at an end opposite to the light incident / exit side on the side, and provided on the other side of the movable module and the fixed body at a position facing the electromagnet in the optical axis direction; And a driven member that generates at least one of attractive force and repulsive force between the electromagnet and the electromagnet.

  In the present invention, the movable module drive mechanism for shake correction includes an electromagnet and a driven member on the side opposite to the light incident / exit side of the movable module, and the electromagnet and the driven member face each other in the optical axis direction. is doing. Moreover, unlike the driving force generated based on Fleming's left-hand rule between the coil and the permanent magnet, an electromagnet is used, so the electromagnet and the driven member may be opposed to each other in the optical axis direction. . For this reason, since the movable module drive mechanism does not occupy a large space around the movable module, it is possible to reduce the size of the optical unit.

  In the present invention, the electromagnet may be an air-core electromagnet that does not have an iron core inside the coil, and the driven member may be a permanent magnet.

  In this case, the permanent magnet can employ a configuration in which the N pole and the S pole are aligned in the optical axis direction.

  Further, the permanent magnet has an inner peripheral side magnetized region in which the N pole and the S pole are arranged in the optical axis direction on the side close to the optical axis in the permanent magnet, and on the outer peripheral side with respect to the inner peripheral side magnetized region. It is possible to adopt a configuration including an outer peripheral side magnetized region in which N poles and S poles are arranged in the optical axis direction in the direction opposite to the inner peripheral side magnetized region at adjacent positions. According to this configuration, for example, in one permanent magnet, the repulsive force acting between the S pole and the electromagnet and the attractive force acting between the N pole and the electromagnet can be used at the same time. Can be obtained. Further, since the magnetic poles arranged in the optical axis direction are opposite in the inner peripheral side magnetized region and the outer peripheral side magnetized region, the permeance coefficient (reciprocal of the magnetic resistance) is large. Therefore, depolarization at high temperatures hardly occurs.

  In the present invention, the electromagnet may be an iron core electromagnet having an iron core inside a coil, and the driven member may be a magnetic body. This configuration has the advantage that the optical unit can be configured at a lower cost than when a permanent magnet is used for the driven member.

  In the present invention, it is preferable that the electromagnet is provided on the fixed body side, and the driven member is provided on the movable module side. If comprised in this way, the electric power feeding to the coil used for the electromagnet is easy.

  In this invention, it is preferable that the said fixed body is equipped with a circuit board on the opposite side to the said driven member with respect to the said electromagnet, and the coil of the said electromagnet is provided on the said circuit board. If comprised in this way, the electric power feeding to a coil is easy.

  In the present invention, when the three orthogonal directions are the X axis, the Y axis, and the Z axis, respectively, and the direction along the optical axis is the Z axis, the movable module drive mechanism moves the movable module to both sides in the X axis direction. It is preferable to be provided at a total of four places: two places sandwiched between the two and two places sandwiching the movable module on both sides in the Y-axis direction. With this configuration, the movable module drive mechanism is provided at a total of four locations, two locations that sandwich the movable module on both sides in the X-axis direction, and two locations that sandwich the movable module on both sides in the Y-axis direction. Can be efficiently swung around the X axis and the Y axis. Further, if the swing of the movable module around the X axis and the swing around the Y axis are combined, the movable module can be displaced with respect to the entire XY plane. Therefore, all shakes assumed in the optical unit can be reliably corrected.

  In the present invention, the movable module may employ a configuration in which an imaging element is held as the optical element. In the present invention, the movable module may employ a configuration in which a lens is held as the optical element. In the present invention, the movable module may adopt a configuration in which an imaging element and a lens are held as the optical element.

  In the present invention, the movable module drive mechanism for shake correction includes an electromagnet and a driven member on the side opposite to the light incident / exit side of the movable module, and the electromagnet and the driven member face each other in the optical axis direction. is doing. Moreover, unlike the driving force generated based on Fleming's left-hand rule between the coil and the permanent magnet, an electromagnet is used, so the electromagnet and the driven member may be opposed to each other in the optical axis direction. . For this reason, since the movable module drive mechanism does not occupy a large space around the movable module, it is possible to reduce the size of the optical unit.

It is explanatory drawing which shows typically a mode that the optical unit for imaging | photography which applied this invention was mounted in optical apparatuses, such as a mobile telephone. It is explanatory drawing of the imaging | photography unit incorporated in the movable module of the optical unit to which this invention is applied. It is explanatory drawing which shows typically the internal structure of the optical unit for imaging | photography concerning Embodiment 1 of this invention. It is explanatory drawing which shows typically the internal structure of the optical unit for imaging | photography concerning Embodiment 2 of this invention. It is explanatory drawing which shows typically the internal structure of the optical unit for imaging | photography concerning Embodiment 3 of this invention.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following description, a configuration for preventing camera shake of the photographing unit as the optical element unit will be exemplified. In the following description, three directions orthogonal to each other are defined as an X axis, a Y axis, and a Z axis, respectively, and a direction along the optical axis L (lens optical axis) is defined as a Z axis. Therefore, in the following description, of the shakes in each direction, rotation around the X axis corresponds to so-called pitching (pitch), rotation around the Y axis corresponds to so-called yawing (roll), and Z axis The rotation around corresponds to so-called rolling. Also, + X is attached to one side of the X axis, -X is attached to the other side, + Y is attached to one side of the Y axis, -Y is attached to the other side, and one side of the Z axis is attached. In the following description, + Z is attached to the side (opposite the subject side), and -Z is attached to the other side (subject side).

[Embodiment 1]
(Overall configuration of optical unit for shooting)
FIG. 1 is an explanatory view schematically showing a state in which an optical unit for photographing to which the present invention is applied is mounted on an optical device such as a mobile phone. An optical unit 100 (an optical unit with a shake correction function) shown in FIG. 1 is a thin camera used in an optical device 1000 such as a camera-equipped mobile phone, and is supported by a chassis 1110 (device body) of the optical device 1000. It is mounted with. In such an optical unit 100, if a shake such as a hand shake occurs in the optical apparatus 1000 during shooting, the captured image is disturbed. Therefore, as will be described later with reference to FIG. 3, the optical unit 100 according to the present embodiment supports the movable module 300 including the imaging unit 1 so as to be swingable within the fixed body 200, and serves as a shake detection sensor. Based on the detection result of the gyroscope 180 (angular velocity sensor), a movable module drive mechanism (not shown in FIG. 1) for swinging the movable module 300 is provided. In the optical unit 100, the detection of the gyroscope 180 is output to the upper control unit, and the flexible wiring board 800 for conducting energization to the movable module driving mechanism from the control unit is drawn out.

(Configuration of the shooting unit 1)
FIG. 2 is an explanatory diagram of the photographing unit built in the movable module of the optical unit to which the present invention is applied. As shown in FIG. 2, the photographing unit 1 includes, for example, a plurality of lenses 10 (see FIG. 1) as optical elements in the A direction (front side) approaching the subject (object side) along the direction of the optical axis L, And an optical element unit that moves in both directions in the B direction (rear side) approaching the opposite side (imaging element side / image side) of the subject, and has a substantially rectangular parallelepiped shape. The photographing unit 1 generally includes a moving body 3 that holds a plurality of lenses 10 (see FIG. 1) and an optical element such as a fixed stop inside, and a lens drive that moves the moving body 3 along the optical axis L direction. It has a mechanism 5 and a support 2 on which a lens driving mechanism 5 and a moving body 3 are mounted. The moving body 3 includes a cylindrical lens holder 12 that holds a lens and a fixed diaphragm, and a coil holder 13 that holds the lens holder 12 on the inner side. The lens driving coils 30s and 30t constituting the lens are held.

  The support 2 includes a rectangular plate-shaped image sensor holder 19 that positions the image sensor 155 on the opposite side to the subject side (−Z side), a box-shaped case 18 that covers the image sensor holder 19 on the subject side, A rectangular plate-like spacer 11 disposed inside the case 18 is provided, and circular incident windows 110 and 18a for taking light from the subject into the lens are formed in the center of the case 18 and the spacer 11, respectively. Has been. A window 19 a that guides incident light to the image sensor 155 is formed in the center of the image sensor holder 19. In the photographing unit 1, the support 2 includes a substrate 151 on which an image sensor 155 is mounted. The substrate 151 is fixed to the lower surface of the image sensor holder 19.

  The case 18 is made of a ferromagnetic plate such as a steel plate and also functions as a yoke. For this reason, the case 18 constitutes a linkage magnetic field generator for generating a linkage magnetic field in the lens drive coils 30 s and 30 t together with the lens drive magnet 17 described later. The lens driving mechanism 5 is configured together with the lens driving coils 30 s and 30 t wound around the outer peripheral surface of the holder 13.

  The support body 2 and the moving body 3 are connected via metal spring members 14s and 14t provided at positions spaced apart in the optical axis L direction. The spring members 14s and 14t have the same basic configuration, and are an outer peripheral side connecting portion held on the support body 2 side, an annular inner peripheral side connecting portion held on the moving body 3 side, and an outer peripheral side. An arm-shaped leaf spring portion that connects the connecting portion and the inner peripheral side connecting portion is provided. Among the spring members 14 s and 14 t, the spring member 14 s on the image sensor 155 side has the outer peripheral side connection portion held by the image sensor holder 19, and the inner peripheral side connection portion is the image sensor side end of the coil holder 13 of the moving body 3. It is connected to. In the subject-side spring member 14 t, the outer peripheral side connecting portion is held by the spacer 11, and the inner peripheral side connecting portion is connected to the subject side end of the coil holder 13 of the moving body 3. In this way, the moving body 3 is supported by the support body 2 via the spring members 14s and 14t so as to be movable in the direction of the optical axis L. The spring members 14s and 14t are both made of nonmagnetic metal such as beryllium copper or nonmagnetic SUS steel, and are formed by pressing a thin plate having a predetermined thickness or etching using a photolithography technique. It is. Of the spring members 14s and 14t, the spring member 14s is divided into two spring pieces, and each end of the lens driving coils 30s and 30t is connected to the spring piece. In the spring member 14s, terminals are formed on the two spring pieces, respectively, and the spring member 14s also functions as a power feeding member for the lens driving coils 30s and 30t.

  A ring-shaped magnetic piece 61 is held at the subject side end of the coil holder 13, and the position of the magnetic piece 61 is a position from the subject side with respect to the lens driving magnet 17. For this reason, the magnetic piece 61 applies a biasing force in the direction of the optical axis L to the moving body 3 by an attractive force acting between the magnetic piece 61 and the lens driving magnet 17. For this reason, at the time of non-energization (origin position), the lens holder 12 can be placed on the image sensor 155 side by the attractive force between the lens driving magnet 17 and the magnetic piece 61. Further, the magnetic piece 61 acts as a kind of yoke, and can reduce leakage magnetic flux from a magnetic path formed between the lens driving magnet 17 and the lens driving coils 30s and 30t. As the magnetic piece 61, a rod-like or spherical magnetic body may be used. If the magnetic piece 61 is formed in a ring shape, there is an effect that the attractive force attracted to the lens driving magnet 17 when the lens holder 12 moves in the optical axis L direction is isotropic. Further, when the lens driving coils 30 s and 30 t are energized, the magnetic piece 61 moves in a direction away from the lens driving magnet 17, so that no extra force is exerted to press the lens holder 12 toward the image sensor 155 side. Therefore, the lens holder 12 can be moved in the direction of the optical axis L with less power.

  In the photographing unit 1 of the present embodiment, when viewed from the direction of the optical axis L, the lens 10 (see FIG. 1) is circular, but the case 18 used for the support 2 has a rectangular box shape. Accordingly, the case 18 includes a rectangular tube-shaped body portion 18c, and an upper plate portion 18b having an incident window 18a formed on the upper surface side of the rectangular tube-shaped body portion 18c. A lens driving magnet 17 is fixed to a side surface corresponding to a quadrangular side of the rectangular cylindrical body 18c, and each of the lens driving magnets 17 is formed of a rectangular flat permanent magnet. Each of the four lens driving magnets 17 is divided into two in the direction of the optical axis L, and in any case, the inner surface and the outer surface are magnetized to different poles.

  In this embodiment, when the coil holder 13 is viewed from the direction of the optical axis L, the inner peripheral shape is circular, but the outer peripheral side surface that defines the outer peripheral shape of the coil holder 13 is a square, and a lens is provided around the coil holder 13. Driving coils 30s and 30t are wound. Here, each of the four lens driving magnets 17 is divided into two in the direction of the optical axis L, and in each case, the inner surface and the outer surface are magnetized to different poles. The winding direction at 30t is opposite. The moving body 3 configured as described above is disposed inside the case 18. As a result, the lens driving coils 30 s and 30 t face the lens driving magnet 17 fixed to the inner surface of the rectangular tubular body 18 c of the case 18.

  In the photographing unit 1 configured as described above, the moving body 3 is normally located on the imaging element side (one side in the Z-axis direction), and in such a state, the lens driving coils 30s and 30t are directed in a predetermined direction. When the current is applied, the lens driving coils 30s and 30t each receive an electromagnetic force directed toward the subject side (the other side in the Z-axis direction). Accordingly, the moving body 3 to which the lens driving coils 30s and 30t are fixed starts to move toward the subject side (front side). At this time, an elastic force that restricts the movement of the moving body 3 is generated between the spring member 14 t and the front end of the moving body 3 and between the spring member 14 s and the rear end of the moving body 3. For this reason, when the electromagnetic force which moves the moving body 3 to the front side and the elastic force which regulates the movement of the moving body 3 balance, the moving body 3 stops. At this time, the moving body 3 can be stopped at a desired position by adjusting the amount of current flowing through the lens driving coils 30 s and 30 t according to the elastic force acting on the moving body 3 by the spring members 14 s and 14 t. .

(Detailed configuration of the optical unit 100)
FIG. 3 is an explanatory diagram schematically showing the internal configuration of the optical unit for photographing according to Embodiment 1 of the present invention, and FIGS. 3 (a), (b), and (c) are respectively from the optical unit. A plan view when viewed from the subject side with the upper plate portion, elastic member, flexible wiring board, etc. of the fixed body omitted, a cross-sectional view when the central portion of the optical unit is cut along the XZ plane, and the optical unit It is sectional drawing when a center part is cut | disconnected along a YZ plane. In FIG. 3A and FIGS. 4A and 5A described later, the movable module 300 is indicated by a thick solid line, the gyroscope 180 is indicated by a long broken line, and the yoke is indicated by a thin solid line. The permanent magnet is indicated by a short dotted line, and the electromagnet is indicated by a one-dot chain line.

  In FIG. 3, the optical unit 100 includes a fixed body 200, a movable module 300 including the photographing unit 1, an elastic member 600 in a state where the movable module 300 is supported by the fixed body 200 so as to be displaceable, A gyroscope 180 that detects the shake of the module 300 and a movable module driving mechanism 500 that generates a magnetic driving force that relatively displaces the movable module 300 with respect to the fixed body 200 between the movable module 300 and the fixed body 200 are provided. is doing.

  In this embodiment, the fixed body 200 includes a cover 250, and the cover 250 includes a rectangular tubular body 210 that surrounds the movable module 300, and an end plate part 220 that closes the subject-side opening of the rectangular tubular body 210. And. The end plate 220 is formed with a window 220a through which light from the subject enters. In the cover 250, the end portion of the rectangular tube-shaped body portion 210 opposite to the subject side (side on which the optical axis extends) (+ Z side) is an open end. In this embodiment, the fixed body 200 has a rigid circuit board 700 fixed to the end of the cover 250 opposite to the subject side, and the circuit board 700 is opposite to the subject side of the cover 250. The opening is closed.

  In this embodiment, the gyroscope 180 is fixed to a substantially central portion of the end portion 300b of the movable module 300 opposite to the subject side. A rectangular frame-shaped yoke 400 is attached around the gyroscope 180 at the end 300b of the movable module 300 opposite to the subject. The yoke 400 includes a rectangular frame-shaped flat plate portion 410 that is orthogonal to the optical axis, and a rectangular tube-shaped body portion 420 that stands vertically from a substantially central portion in the width direction of the flat plate portion 410 toward the subject. ing. In the present embodiment, the movable module 300 and the yoke 400 are in contact with the inner peripheral side portion of the flat plate portion 410 at the end portion 300b opposite to the subject side, and the side surface portion 300c on the inner peripheral surface of the rectangular tubular body 420. Are connected so as to contact each other.

  In this embodiment, the elastic member 600 includes an elastic member 610 disposed between the gyroscope 180 and the circuit board 700, a rectangular tubular body 420 of the yoke 400, and a rectangular tubular body 210 of the fixed body 200. The elastic member 620 is disposed on the flat plate portion 410. Among the elastic members 610 and 620, the elastic member 610 is made of a spherical or disk-shaped rubber, a coil spring, or the like. The elastic member 620 is made of an annular rubber or a leaf spring disposed around the movable module 300.

  A permanent magnet 510 is attached to the end 300 b of the movable module 300 opposite to the subject side via a flat plate portion 410 of the yoke 400, while the fixed body 200 has an optical axis direction with respect to the permanent magnet 510. A coil 520 is mounted on the opposite circuit board 700. The end of the coil 520 is electrically connected to the land of the circuit board 700. The coil 520 constitutes an electromagnet 530 that does not have an iron core inside. The base of the circuit board 700 is a nonmagnetic substrate.

  In the permanent magnet 510, the S pole and the N pole are adjacent to each other in the optical axis direction. In this embodiment, the N pole faces the coil 520 (electromagnet 530). In this manner, in this embodiment, the movable module driving mechanism 500 is configured by the electromagnet 530 and the permanent magnet 510 that face each other in the optical axis direction at the end portion 300b of the movable module 300 opposite to the subject side. Here, the movable module driving mechanism 500 is movable on the Y side in two places sandwiching the movable module 300 on both sides in the X-axis direction and in two places sandwiching the movable module 300 x on both sides in the Y-axis direction. The module driving mechanism 500y is configured at a total of four locations.

(Operation of shake correction)
In the optical unit 100 of the present embodiment, when the optical device 1000 shown in FIG. 1 is shaken and the optical unit 100 is shaken, the shake is detected by the gyroscope 180, and the detection by the gyroscope 180 is flexible as shown in FIG. The data is output to an upper control unit (not shown) via the wiring board 800. The upper control unit performs closed loop control based on the detection by the gyroscope 180 and supplies a drive current that cancels out the shake of the movable module 300 to the coil 520 via the flexible substrate 800 and the circuit substrate 700.

  For example, as shown in FIG. 3B, when the optical unit 100 is swung and the movable module 300 is swung to the −X side as indicated by the arrow Y1, the above-described control unit is located on the −X side. In the side movable module drive mechanism 500x, the coil 520 is energized and controlled so that the side located on the permanent magnet 510 side of the electromagnet 530 becomes N pole, and the permanent magnet of the electromagnet 530 in the X side movable module drive mechanism 500x located on the + X side. The coil 520 is energized and controlled so that the side located on the 510 side becomes the S pole. As a result, in the X-side movable module drive mechanism 500x located on the −X side, the repulsive force indicated by the arrow Ya is generated between the electromagnet 530 and the permanent magnet 510, while the X-side movable module drive mechanism located on the + X side. In 500x, an attractive force indicated by an arrow Yb is generated between the electromagnet 530 and the permanent magnet 510. Therefore, the movable module 300 tries to return to the direction indicated by the arrow Y2 while deforming the elastic member 600 (elastic members 610 and 620), so that the shake of the movable module 300 around the Y axis is canceled out.

  Further, as shown in FIG. 3C, when the optical unit 100 is swung and the movable module 300 is swung to the −Y side as indicated by the arrow X1, the control unit is located on the −Y side. The energization of the coil 520 is controlled so that the side of the electromagnet 530 located on the permanent magnet 510 side in the side movable module drive mechanism 500y becomes the N pole, and the permanent magnet of the electromagnet 530 in the Y side movable module drive mechanism 500y located on the + Y side. The coil 520 is energized and controlled so that the side located on the 510 side becomes the S pole. As a result, in the Y-side movable module drive mechanism 500y located on the −Y side, a repulsive force is generated between the electromagnet 530 and the permanent magnet 510, while in the Y-side movable module drive mechanism 500y located on the + Y side, the electromagnet An attractive force is generated between 530 and the permanent magnet 510. Therefore, the movable module 300 attempts to return to the direction indicated by the arrow X2 while deforming the elastic member 600 (elastic members 610 and 620), so that the shake around the X axis of the movable module 300 is canceled out.

  Further, if the swing of the movable module 300 around the X axis and the swing around the Y axis are combined, the movable module 300 can be displaced with respect to the entire XY plane. Therefore, all shakes assumed in the optical unit 100 can be reliably corrected.

(Main effects of this form)
As described above, in the optical unit 100 of this embodiment, the movable module driving mechanism 500 (X-side movable module driving mechanism 500x and Y-side movable module driving mechanism 500y) for shake correction is used to input and output light from the movable module 300. An electromagnet 530 and a permanent magnet 510 (driven member) are provided on the side opposite to the side, and the electromagnet 530 and the permanent magnet 510 face each other in the optical axis direction. Moreover, unlike the driving force generated based on Fleming's left-hand rule between the coil and the permanent magnet, since the electromagnet 530 is used, the electromagnet 530 and the permanent magnet 510 can be opposed to each other in the optical axis direction. That's fine. For this reason, the movable module drive mechanism 500 (the X-side movable module drive mechanism 500x and the Y-side movable module drive mechanism 500y) does not occupy a large space around the movable module 300, so that the optical unit 100 can be downsized. it can.

  Further, in this embodiment, since the electromagnet 530 is provided on the fixed body 200 side and the driven member (permanent magnet 510) is provided on the movable module 300 side, it is easy to energize the coil 520 to the electromagnet 530. There is. In addition, since the coil 520 is mounted on the circuit board 700, power supply to the coil 520 is easy.

  Further, since the coil 520 is mounted on the circuit board 700, when the optical unit 1 is assembled, the circuit board 700 on which the coil 520 is mounted is integrated with the elastic member 610, the yoke 400, and the permanent magnet 510. Since the movable module 300, the elastic member 620, and the cover 220 need only be sequentially mounted, the assemblability is excellent.

[Embodiment 2]
FIG. 4 is an explanatory diagram schematically showing the internal configuration of the optical unit for photographing according to Embodiment 2 of the present invention. FIGS. 4 (a), 4 (b), and 4 (c) are respectively shown from the optical unit. A plan view when viewed from the subject side with the upper plate portion, elastic member, flexible wiring board, etc. of the fixed body omitted, a cross-sectional view when the central portion of the optical unit is cut along the XZ plane, and the optical unit It is sectional drawing when a center part is cut | disconnected along a YZ plane. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  4, the optical unit 100 of the present embodiment is also supported by the fixed body 200 so as to be displaceable by the fixed body 200, the movable module 300 that holds the photographing unit 1 inside, as in the first embodiment. The elastic member 600 to be in a state of being in contact, the gyroscope 180 that detects the shake of the movable module 300, and the magnetic driving force that relatively displaces the movable module 300 with respect to the fixed body 200 between the movable module 300 and the fixed body 200. And a movable module driving mechanism 500 to be generated.

  In this embodiment, the fixed body 200 includes a cover 250, and the cover 250 includes a rectangular tubular body 210 that surrounds the movable module 300, and an end plate part 220 that closes the subject-side opening of the rectangular tubular body 210. And. The end plate 220 is formed with a window 220a through which light from the subject enters. The fixed body 200 has a rigid circuit board 700 fixed to the end of the cover 250 opposite to the subject side. The gyroscope 180 is fixed to a substantially central portion of the end portion 300b of the movable module 300 opposite to the subject side.

  A rectangular frame-shaped yoke 400 is attached around the gyroscope 180 at the end 300b of the movable module 300 opposite to the subject. The yoke 400 includes a rectangular frame-shaped flat plate portion 410 that is orthogonal to the optical axis, and a rectangular tube-shaped body portion 420 that stands vertically from a substantially central portion in the width direction of the flat plate portion 410 toward the subject. ing.

  In this embodiment, the rectangular tubular body 420 covers the entire side surface of the movable module 300, and the elastic member 620 is provided between the rectangular tubular body 420 of the yoke 400 and the rectangular tubular body 210 of the fixed body 200. Is arranged. The elastic member 600 includes only the elastic member 620 disposed at a substantially intermediate position in the optical axis direction of the rectangular tube-shaped body portion 210 and is separated from the flat plate portion 410 in the optical axis direction.

  A permanent magnet 510 is attached to the end 300 b of the movable module 300 opposite to the subject side via a flat plate portion 410 of the yoke 400, while the circuit board 700 is in the optical axis direction with respect to the permanent magnet 510. A coil 520 is mounted at the facing position, and the coil 520 constitutes an electromagnet 530 that does not have an iron core inside. Here, the base of the circuit board 700 is a nonmagnetic substrate.

  In the present embodiment, the permanent magnet 510 is adjacent to the inner peripheral side magnetized region 511 in which the N pole and the S pole are arranged in the optical axis direction on the side close to the optical axis, on the outer peripheral side with respect to the inner peripheral side magnetized region 511. And an outer peripheral side magnetized region 512 in which N and S poles are arranged in the optical axis direction in the opposite direction to the inner peripheral side magnetized region 511. In this embodiment, in the inner peripheral side magnetized region 511, the S pole is directed toward the coil 520 (electromagnet 530), and in the outer peripheral side magnetized region 512, the N pole is directed toward the coil 520 (electromagnet 530). ing. In this manner, in this embodiment, the movable module driving mechanism 500 is configured by the electromagnet 530 and the permanent magnet 510 that face each other in the optical axis direction at the end portion 300b of the movable module 300 opposite to the subject side. Here, the movable module driving mechanism 500 is movable on the Y side in two places sandwiching the movable module 300 on both sides in the X-axis direction and in two places sandwiching the movable module 300 x on both sides in the Y-axis direction. The module driving mechanism 500y is configured at a total of four locations.

  In the optical unit 100 of the present embodiment, for example, as shown in FIG. 4B, when the optical unit 100 is swung and the movable module 300 is swung to the −X side as indicated by the arrow Y1, the control unit described above is used. Controls the energization of the coil 520 so that the side of the electromagnet 530 located on the permanent magnet 510 side in the X-side movable module drive mechanism 500x located on the −X side becomes the N pole, and the X-side movable module located on the + X side. In the drive mechanism 500x, the energization of the coil 520 is controlled so that the side of the electromagnet 530 located on the permanent magnet 510 side becomes the south pole.

  As a result, in the X-side movable module drive mechanism 500x located on the −X side, a repulsive force is generated between the electromagnet 530 and the outer peripheral side magnetized region 512 of the permanent magnet 510, while the electromagnet 530 and the permanent magnet 510 An attraction force is generated between the peripheral side magnetized region 511 and the peripheral side magnetized region 511. Further, in the X-side movable module drive mechanism 500x located on the + X side, an attractive force is generated between the electromagnet 530 and the outer periphery side magnetized region 512 of the permanent magnet 510, while the inner periphery side of the electromagnet 530 and the permanent magnet 510 is generated. A repulsive force is generated between the magnetized region 511 and the magnetized region 511. Therefore, the movable module 300 tries to return to the direction indicated by the arrow Y2 while deforming the elastic member 620, so that the swing of the movable module 300 around the Y axis is canceled out.

  Further, as shown in FIG. 4C, when the optical unit 100 is swung and the movable module 300 is swung to the −Y side as indicated by the arrow X1, the control unit is located on the −Y side. The energization of the coil 520 is controlled so that the side of the electromagnet 530 located on the permanent magnet 510 side in the side movable module drive mechanism 500y becomes the N pole, and the permanent magnet of the electromagnet 530 in the Y side movable module drive mechanism 500y located on the + Y side. The coil 520 is energized and controlled so that the side located on the 510 side becomes the S pole.

  As a result, in the Y-side movable module drive mechanism 500y located on the −Y side, a repulsive force is generated between the electromagnet 530 and the outer peripheral side magnetized region 512 of the permanent magnet 510, while the electromagnet 530 and the permanent magnet 510 An attraction force is generated between the peripheral side magnetized region 511 and the peripheral side magnetized region 511. In the Y-side movable module drive mechanism 500y located on the + Y side, an attractive force is generated between the electromagnet 530 and the outer peripheral side magnetized region 512 of the permanent magnet 510, while the inner periphery side of the electromagnet 530 and the permanent magnet 510 is used. A repulsive force is generated between the magnetized region 511 and the magnetized region 511. Therefore, the movable module 300 tries to return to the direction indicated by the arrow X2 while deforming the elastic member 620, so that the shake of the movable module 300 around the X axis is canceled.

  As described above, also in the optical unit 100 of the present embodiment, as in the first embodiment, the movable module driving mechanism 500 (X side movable module driving mechanism 500x and Y side movable module driving mechanism 500y) for shake correction is a movable module. An electromagnet 530 and a permanent magnet 510 (driven member) are provided on the side opposite to the light incident / exit side of 300, and the electromagnet 530 and the permanent magnet 510 face each other in the optical axis direction. Moreover, unlike the driving force generated based on Fleming's left-hand rule between the coil and the permanent magnet, the electromagnet 530 is used, so that the electromagnet 530 and the permanent magnet 510 are opposed to each other in the optical axis direction. That's fine. For this reason, the movable module drive mechanism 500 (the X-side movable module drive mechanism 500x and the Y-side movable module drive mechanism 500y) does not occupy a large space around the movable module 300, so that the optical unit 100 can be downsized. The same effects as in the first embodiment can be obtained.

  The permanent magnet 510 has an inner peripheral side magnetized region 511 in which the N pole and the S pole are arranged in the optical axis direction on the side close to the optical axis, and a position adjacent to the inner peripheral side magnetized region 511 on the outer peripheral side. And an outer peripheral side magnetized region 512 in which N and S poles are arranged in the optical axis direction in the opposite direction to the inner peripheral side magnetized region 511. For this reason, in one permanent magnet 51, since the repulsive force and attractive force which act between one electromagnet 530 can be utilized simultaneously, a big rocking force can be obtained. Further, in the inner peripheral side magnetized region 511 and the outer peripheral side magnetized region 512, since the magnetic poles arranged in the optical axis direction are opposite, the permeance coefficient (reciprocal of the magnetic resistance) is large. Therefore, depolarization at high temperatures hardly occurs.

[Embodiment 3]
FIG. 5 is an explanatory diagram schematically showing the internal configuration of the optical unit for photographing according to Embodiment 3 of the present invention. FIGS. 5 (a), 5 (b), and 5 (c) are respectively shown from the optical unit. A plan view when viewed from the subject side with the upper plate portion, elastic member, flexible wiring board, etc. of the fixed body omitted, a cross-sectional view when the central portion of the optical unit is cut along the XZ plane, and the optical unit It is sectional drawing when a center part is cut | disconnected along a YZ plane. Since the basic configuration of this embodiment is the same as that of Embodiment 1, common portions are denoted by the same reference numerals and description thereof is omitted.

  5, the optical unit 100 of the present embodiment is also supported by the fixed body 200 so as to be displaceable, as with the first embodiment, the fixed body 200, the movable module 300 that holds the photographing unit 1 inside, and the movable module 300. The elastic member 600 to be in a state of being in contact, the gyroscope 180 that detects the shake of the movable module 300, and the magnetic driving force that relatively displaces the movable module 300 with respect to the fixed body 200 between the movable module 300 and the fixed body 200. And a movable module driving mechanism 500 to be generated.

  In this embodiment, the fixed body 200 includes a cover 250, and the cover 250 includes a rectangular tubular body 210 that surrounds the movable module 300, and an end plate part 220 that closes the subject-side opening of the rectangular tubular body 210. And. The end plate 220 is formed with a window 220a through which light from the subject enters. The cover 250 includes a flange 230 that extends to the outer peripheral side at a position shifted from the intermediate position in the optical axis direction to the opposite side of the subject, and a large-diameter barrel that extends from the outer peripheral edge of the flange 230 to the opposite side of the subject. Part 240. The fixed body 200 has a rigid circuit board 700 fixed to the end of the large-diameter body 240 opposite to the object side. The circuit board 700 is connected to the object-side of the large-diameter body 240. The opening on the opposite side is closed. The gyroscope 180 is fixed to a substantially central portion of the end portion 300b of the movable module 300 opposite to the subject side.

  A rectangular frame-shaped magnetic body 540 is attached around the gyroscope 180 at the end 300 b of the movable module 300 opposite to the subject. The magnetic body 540 includes a rectangular frame-shaped plate portion 541 that is orthogonal to the optical axis, and a rectangular tube-shaped body portion 542 that stands vertically from a substantially central portion in the width direction of the plate-like portion 541 toward the subject side. And. In this embodiment, the movable module 300 and the magnetic body 540 are in contact with the inner peripheral side portion of the plate-like portion 541 and the end portion 300b of the movable module 300 opposite to the subject side, so The side surface portion 300c is coupled to the inner peripheral surface of 542 so as to contact. Here, the elastic member 600 includes only the elastic member 610 disposed between the gyroscope 180 and the circuit board 700.

  At the end 300b of the movable module 300 opposite to the subject side, a coil 550 is mounted on the circuit board 700 at a position facing the magnetic body 540 in the optical axis direction, and iron is placed inside the coil 550. A core 560 is disposed. Thus, the coil 550 constitutes an electromagnet 570 having an iron core 560 on the inside. The end of the coil 550 is electrically connected to the land of the circuit board 700. Here, either a magnetic substrate or a non-magnetic substrate may be used as the base of the circuit board 700. However, if a magnetic substrate is used, it can function as a yoke for the coil 550, so that leakage of magnetic flux is suppressed. And driving efficiency can be improved.

  Even in the optical unit 100 configured as described above, the movable module drive mechanism 500 includes the X-side movable module drive mechanism 500x and the movable module drive mechanism 500 at two locations sandwiching the movable module 300 on both sides in the X-axis direction. The Y-side movable module driving mechanism 500y is configured at four places in total at two places sandwiching the module 300 on both sides in the Y-axis direction.

  In the optical unit 100 of the present embodiment, for example, as shown in FIG. 5B, when the optical unit 100 is swung and the movable module 300 is swung to the −X side as indicated by the arrow Y1, the control unit described above is used. Does not energize the coil 550 of the X-side movable module drive mechanism 500x located on the −X side, and controls energization of the coil 550 constituting the electromagnet 570 in the X-side movable module drive mechanism 500x located on the + X side. As a result, in the X-side movable module drive mechanism 500x located on the + X side, an attractive force is generated between the electromagnet 570 and the magnetic body 540. Therefore, the movable module 300 tries to return to the direction indicated by the arrow Y2 while deforming the elastic member 610, so that the swing of the movable module 300 around the Y axis is canceled out.

  Further, as shown in FIG. 5C, when the optical unit 100 is swung and the movable module 300 is swung to the −Y side as indicated by the arrow X1, the above control unit is located on the −Y side. The coil 550 of the side movable module drive mechanism 500y is not energized, and the coil 550 constituting the electromagnet 570 is controlled in the Y side movable module drive mechanism 500y located on the + Y side. As a result, in the Y-side movable module drive mechanism 500y located on the + Y side, an attractive force is generated between the electromagnet 570 and the magnetic body 540. Therefore, the movable module 300 tries to return to the direction indicated by the arrow X2 while deforming the elastic member 610, so that the shake of the movable module 300 around the X axis is canceled out.

  As described above, the optical unit 100 according to the present embodiment includes the movable module driving mechanism 500 (X-side movable module driving mechanism 500x and Y-side movable module driving mechanism 500y) for shake correction. Includes an electromagnet 570 and a magnetic body 540 (driven member) on the opposite side, and the electromagnet 530 and the magnetic body 540 face each other in the optical axis direction. In addition, unlike the driving force generated based on Fleming's left-hand rule between the coil and the permanent magnet, the electromagnet 570 is used, so that the electromagnet 570 and the magnetic body 540 are opposed to each other in the optical axis direction. That's fine. For this reason, the movable module drive mechanism 500 (the X-side movable module drive mechanism 500x and the Y-side movable module drive mechanism 500y) does not occupy a large space around the movable module 300, so that the optical unit 100 can be downsized. The same effects as in the first embodiment can be obtained.

  Further, unlike the first and second embodiments, since the magnetic piece 540 is used as the driven member, the optical unit 100 can be configured at a lower cost and the movable module 300 can be reduced in weight compared to the case where the permanent magnet 510 is used. There is an advantage that can be achieved.

[Embodiment 4]
In the first to third embodiments, the electromagnets 530 and 570 are provided on the fixed body 200 side, and the driven member (the permanent magnet 510 or the magnetic body 540) is provided on the movable module 300 side. A driven member (permanent magnet 510 or magnetic body 540) may be provided on the fixed module 200 side, provided on the movable module 300 side.

[Other embodiments]
In the above embodiment, the X-side movable module drive mechanism 500x and the Y-side movable module drive mechanism 500y are provided for the photographing unit 1, but only the shake in the direction in which the shake is likely to occur when used by the user is corrected. As described above, the present invention may be applied when only one of the X-side movable module drive mechanism 500x and the Y-side movable module drive mechanism 500y is provided.

  In the above embodiment, an example in which the present invention is applied to the optical unit 100 used in a camera-equipped mobile phone has been described. However, the present invention may be applied to an optical unit 100 used in a thin digital camera or the like. In the above embodiment, the lens driving mechanism 5 that magnetically drives the moving body 3 including the lens 10 in the direction of the optical axis L in addition to the lens 10 and the imaging element 155 is supported on the support 2 in the photographing unit 1. Although an example has been described, the present invention may be applied to a fixed focus type optical unit in which the lens driving mechanism 5 is not mounted on the photographing unit 1.

  In the above-described embodiment, a movable module including a lens and an image sensor has been described as the movable module. However, the present invention can be applied to an optical unit including at least a lens as the movable module. Examples of such an optical unit include a laser pointer and a portable or vehicle-mounted projection display device.

DESCRIPTION OF SYMBOLS 1 Imaging unit 10 Lens 100 Optical unit 180 Gyroscope 200 Fixed body 250 Cover 300 Movable module 300b Movable module end 400 Yoke 500 Movable module drive mechanism 500x X side movable module drive mechanism 500y Y side movable module drive mechanism 510 Permanent magnet 520 550 Coil 530 570 Electromagnet 560 Iron core 600 Elastic member 700 Circuit board

Claims (11)

A fixed body,
A movable module holding the optical element;
An elastic member in which the movable module is supported so as to be displaceable with respect to the fixed body;
A movable module driving mechanism for shake correction that swings the movable module with respect to the fixed body;
In an optical unit with a shake correction function having
The movable module drive mechanism includes an electromagnet provided at an end opposite to the light incident / exit side on one side of the movable module and the fixed body, and the other of the movable module and the fixed body. And a driven member that is provided at a position facing the electromagnet in the optical axis direction and generates at least one of an attractive force and a repulsive force with the electromagnet. unit. The electromagnet is an air-core electromagnet that does not have an iron core inside the coil,
The optical unit according to claim 1, wherein the driven member is a permanent magnet.   The optical unit according to claim 2, wherein the permanent magnet includes an N pole and an S pole arranged in the optical axis direction.   The permanent magnet is adjacent to the inner peripheral side magnetized region in which the N pole and the S pole are arranged in the optical axis direction on the side close to the optical axis in the permanent magnet, on the outer peripheral side with respect to the inner peripheral side magnetized region. The optical unit according to claim 2, further comprising: an outer peripheral side magnetized region in which an N pole and an S pole are arranged in the optical axis direction in a direction opposite to the inner peripheral magnetized region at a position. . The electromagnet is an iron core electromagnet having an iron core inside a coil,
The optical unit according to claim 1, wherein the driven member is a magnetic body. The electromagnet is provided on the fixed body side,
The optical unit according to claim 1, wherein the driven member is provided on the movable module side. The fixed body includes a circuit board on a side opposite to the driven member with respect to the electromagnet,
The optical unit according to claim 6, wherein the coil of the electromagnet is provided on the circuit board.   When the three orthogonal directions are the X axis, the Y axis, and the Z axis, respectively, and the direction along the optical axis is the Z axis, the movable module drive mechanism has two locations that sandwich the movable module on both sides in the X axis direction. The optical unit according to any one of claims 1 to 7, wherein the optical unit is provided at a total of four places, two places sandwiching the movable module on both sides in the Y-axis direction.   The optical unit according to claim 1, wherein the movable module holds an image sensor as the optical element.   The optical unit according to claim 1, wherein the movable module holds a lens as the optical element.   The optical unit according to claim 1, wherein the movable module holds an imaging element and a lens as the optical element.

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