WO2020066572A1 - 振れ補正機能付きユニット - Google Patents

振れ補正機能付きユニット Download PDF

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Publication number
WO2020066572A1
WO2020066572A1 PCT/JP2019/035386 JP2019035386W WO2020066572A1 WO 2020066572 A1 WO2020066572 A1 WO 2020066572A1 JP 2019035386 W JP2019035386 W JP 2019035386W WO 2020066572 A1 WO2020066572 A1 WO 2020066572A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical axis
drive mechanism
rolling
shake correction
movable body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/035386
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
伸司 南澤
猛 須江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Instruments Corp
Original Assignee
Nidec Sankyo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nidec Sankyo Corp filed Critical Nidec Sankyo Corp
Priority to US17/279,104 priority Critical patent/US11982865B2/en
Priority to CN201980060290.XA priority patent/CN112703449B/zh
Publication of WO2020066572A1 publication Critical patent/WO2020066572A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing

Definitions

  • the present invention relates to a unit with a shake correction function on which an optical module is mounted.
  • the unit with a shake correction function is a movable body on which the optical module is mounted, a fixed body that supports the movable body via a support mechanism so as to be displaceable, and a drive mechanism for shake correction that corrects the shake of the movable body with respect to the fixed body.
  • the drive mechanism for shake correction includes, for example, a swing drive mechanism for swinging the optical module in a pitching (pitch: tilting) direction and a yawing (rolling: panning) direction, and rotating the optical module about the optical axis.
  • a rolling drive mechanism or the like is used.
  • Patent Literature 1 discloses a lens driving device including a first driving mechanism for moving a photographing lens in an optical axis direction, a second driving mechanism for correcting a shake of the photographing lens, and a third driving mechanism.
  • the lens driving device of Patent Literature 1 includes a first holding body that holds a lens holder, a second holding body that supports the first holding body movably in the optical axis direction via a leaf spring, and a second holding body that holds a first holding body via a wire. And a fixed body for holding the holding body movably in a direction substantially orthogonal to the optical axis direction.
  • the first drive mechanism includes a magnet and a coil arranged between the first holding member and the second holding member.
  • the second drive mechanism and the third drive mechanism which are drive mechanisms for shake correction, are configured by magnets and coils arranged between the second holder and the fixed body.
  • the fixed body is an outer case of the device
  • the second holder is an inner case arranged inside the outer case
  • the first driving mechanism is arranged inside the second holder. Is done.
  • the first drive mechanism includes a coil held by a first holder that moves in the optical axis direction integrally with the imaging lens, and a magnet that is held by the second holder.
  • the second holder for holding the magnet is formed of a magnetic material and functions as a yoke for the magnet.
  • Patent Document 1 when a movable body has a built-in magnetic drive mechanism (magnet and coil) and a magnetic drive mechanism (magnet and coil) is also provided outside the movable body, a magnetic drive mechanism inside the movable body is provided. Then, magnetic interference with the magnetic drive mechanism outside the movable body becomes a problem.
  • the magnetic drive mechanism inside the movable body does not mount a coil on the movable part side (lens holder side) (moving coil method) as in Patent Document 1, but uses a magnet on the movable part side (lens holder side).
  • the magnet In the case of the method of mounting on a moving body (moving magnet method), the magnet is not arranged on the second holding body but the coil is arranged, so that the inner case does not need to have the function of a yoke. Is used. Therefore, since the magnetic field of the external magnetic drive mechanism cannot be shielded by the inner case made of a magnetic material, the magnet inside the movable body is attracted by the external magnetic drive mechanism and cannot move.
  • an object of the present invention is to provide a shake correction function capable of suppressing magnetic interference between a movable body and a magnetic drive mechanism for shake correction provided between the movable body and the fixed body. It is to propose a unit with a tag.
  • the present invention provides a movable body provided with an arrangement space for an optical module, a fixed body, and the movable body rotatable around the optical axis of the optical module with respect to the fixed body. And a rolling drive mechanism for rotating the movable body around the optical axis, wherein the rolling drive mechanism is a driving coil mounted on one of the movable body and the fixed body. And a driving magnet mounted on the other side, wherein the driving coil and the driving magnet face each other in the optical axis direction, and have a diameter about the optical axis with respect to the arrangement space. It is characterized by being arranged outside the direction.
  • the movable body capable of holding the optical module can be rotated around the optical axis. Therefore, since the shake correction in the rolling direction can be performed, the disturbance of the captured image due to the optical module can be suppressed. Further, since the rolling drive mechanism is disposed radially outside of the optical module installation space, there is no need to displace the optical module installation space and the rolling drive mechanism in the optical axis direction. Therefore, an increase in size in the optical axis direction due to the provision of the rolling drive mechanism can be suppressed. Therefore, it is possible to reduce the thickness of the unit with the shake correction function in the optical axis direction.
  • the driving magnet and the drive coil face each other in the optical axis direction, so that the magnetic field of the rolling drive mechanism hardly enters the space where the optical module is arranged. Therefore, magnetic interference between the movable body and the rolling drive mechanism can be suppressed.
  • the rolling drive mechanism overlaps with the movable body when viewed from the radial direction. Further, it is preferable that the rolling support mechanism overlaps with the movable body and the rolling drive mechanism when viewed from the radial direction. In this way, an increase in the size in the optical axis direction due to the provision of the rolling drive mechanism and an increase in the size in the optical axis direction due to the provision of the rolling support mechanism can be suppressed. Therefore, it is possible to reduce the thickness of the unit having the shake correction function in the optical axis direction.
  • the optical module includes a magnet and a coil, and a center of the magnet in the optical axis direction and a center of the driving magnet in the optical axis direction overlap when viewed from the radial direction.
  • the direction of the magnetic flux emitted from the driving magnet is perpendicular to the direction from the driving magnet toward the magnet in the optical module. Therefore, since there is little possibility that the magnetic flux from the driving magnet reaches the magnet in the optical module, it is possible to suppress the magnetic interference between the rolling drive mechanism and the optical module.
  • the movable body includes a rolling drive mechanism fixing section in which the driving magnet or the driving coil is disposed, and the rolling drive mechanism fixing section includes a fixed body side stopper section provided in the fixed body. It is preferable to include a movable-body-side stopper portion that contacts the direction around the optical axis.
  • the driving coil is disposed on the fixed body, and the driving magnet is disposed on the movable body.
  • the rolling drive mechanism is arranged at a plurality of positions including two positions on opposite sides of the optical axis.
  • the bias of the center of gravity of the movable body can be suppressed as compared with the case where the rolling drive mechanism is provided only at one position. Therefore, it is possible to suppress a decrease in the accuracy of the shake correction due to the deviation of the center of gravity, and it is possible to accurately perform the rolling correction. Further, there is no need to provide a counterweight to suppress the deviation of the center of gravity. Furthermore, by providing a plurality of rolling drive mechanisms, shake correction can be performed with a large torque.
  • the rolling support mechanism is provided at a plurality of circumferential positions around the optical axis, wherein the plurality of positions are opposed to each other in a first direction orthogonal to the optical axis direction; Direction and a position facing in the second direction orthogonal to the first direction, the spacing between the rolling support mechanisms facing in the first direction is smaller than the spacing between the rolling support mechanisms facing in the second direction, It is preferable that the rolling drive mechanism is provided at a position facing the second direction across the optical axis. With this configuration, the size in the first direction is not increased by providing the rolling drive mechanism, so that the size of the unit with the shake correction function is reduced in the first direction orthogonal to the direction in which the rolling drive mechanism faces. can do.
  • the fixed body includes a fixed frame provided with a wiring concave portion that is recessed in the optical axis direction, and a flexible printed circuit board connected to the driving coil.
  • the shape is such that the distance between the Hall element mounted on the flexible printed board disposed in the concave portion for wiring and the driving magnet is a predetermined distance.
  • the rolling drive mechanism since the rolling drive mechanism is disposed radially outward with respect to the optical module installation space, it is not necessary to displace the optical module installation space and the rolling drive mechanism in the optical axis direction. Therefore, an increase in size in the optical axis direction due to the provision of the rolling drive mechanism can be suppressed. Therefore, it is possible to reduce the thickness of the unit with the shake correction function in the optical axis direction. Further, in the rolling drive mechanism, since the magnet and the coil oppose each other in the optical axis direction, it is difficult for the magnetic field of the rolling drive mechanism to enter the space where the optical module is arranged. Therefore, magnetic interference between the movable body and the rolling drive mechanism can be suppressed.
  • FIG. 2 is a cross-sectional view of the optical module and a unit with a shake correction function (a cross-sectional view along AA in FIG. 1).
  • FIG. 2 is an exploded perspective view of the unit with a shake correction function of FIG. 1 as viewed from a subject side.
  • FIG. 2 is an exploded perspective view of the unit with a shake correction function of FIG. 1 as viewed from an image side. It is the perspective view which looked at the unit with a shake correction function from which the front board was removed from the object side.
  • FIG. 6 is a partially enlarged view of the rolling support mechanism as viewed from the subject side (a partially enlarged view of FIG. 5).
  • FIG. 5 is a perspective view of the unit with a shake correction function from which the front plate is removed as viewed from the image side.
  • FIG. 8 is a partially enlarged view of the rolling support mechanism as viewed from the image side (a partially enlarged view of FIG. 7). It is a perspective view of an elastic member.
  • the X-axis direction is a first direction.
  • One side of the X-axis direction is a + X direction, and the other side is a ⁇ X direction.
  • the Y-axis direction is a second direction.
  • One side of the Y-axis direction is a + Y direction, and the other side is a ⁇ Y direction.
  • the Z-axis direction is a direction along the optical axis L (lens optical axis) of the optical module 1.
  • One side of the Z-axis direction is a + Z direction, and the other side is a -Z direction.
  • the + Z direction is the object side L1
  • the -Z direction is the image side L2.
  • FIG. 1 is a perspective view of a unit 100 with a shake correction function to which the present invention is applied.
  • FIG. 2 is a cross-sectional view of the optical module 1 and the unit 100 with a shake correction function (a cross-sectional view along AA in FIG. 1).
  • the unit with shake correction function 100 includes a fixed body 20 and a movable body 10.
  • the movable body 10 includes an arrangement space 2 in which the optical module 1 is arranged.
  • the unit 100 with the shake correction function has a rectangular parallelepiped shape.
  • the arrangement space 2 is a rectangular shape when viewed from the optical axis L direction, and is a penetrating part that penetrates the substantially center of the unit 100 with shake correction function in the X-axis direction and the Y-axis direction in the Z-axis direction. Note that the shape of the arrangement space 2 does not have to be rectangular, and can be changed as appropriate according to the shape of the optical module 1.
  • the optical module 1 is arranged in the arrangement space 2 and held by the movable body 10.
  • the movable body 10 is connected to the fixed body 20 via a rolling support mechanism 30 described later.
  • the rolling support mechanism 30 supports the movable body 10 rotatably around the optical axis L of the optical module 1 with respect to the fixed body 20.
  • the unit 100 with the shake correction function includes a rolling drive mechanism 40 that rotates the movable body 10 around the optical axis L.
  • the unit 100 with the shake correction function holding the optical module 1 is mounted on a portable terminal, a drive recorder, or an optical device such as an imaging device mounted on an unmanned helicopter.
  • rotation around the X axis corresponds to pitching (pitch)
  • rotation around the Y axis corresponds to yawing (rolling)
  • Z Rotation around the axis corresponds to rolling.
  • the unit 100 with shake correction function drives the rolling drive mechanism 40 to perform shake correction.
  • the control unit and the gyroscope for controlling the rolling drive mechanism may be mounted on the optical device main body, or may be mounted on the optical module 1.
  • the optical module 1 includes a shake correction drive mechanism 3 that performs shake correction in the pitching direction and the yawing direction.
  • the optical module 1 includes, for example, a fixed portion fixed to the movable body 10, a movable portion provided with a lens holder, and a support mechanism for supporting the movable portion movably in the pitching direction and the yawing direction with respect to the fixed portion.
  • the shake correction drive mechanism 3 is, for example, a magnetic drive mechanism including a magnet 4 and a coil 5, and rotates the movable section about the X axis and the Y axis with respect to the fixed section.
  • the optical module 1 drives the shake correction drive mechanism 3 to perform shake correction.
  • the optical module 1 is configured to include the shake correction drive mechanism 3 that performs shake correction in the pitching direction and the yaw direction, but the optical module 1 is not limited to this structure.
  • the optical module 1 may have a configuration capable of correcting shake in only one of the pitching direction and the yawing direction.
  • the optical module 1 may have a configuration in which the pitching direction and the yawing direction are not corrected and the optical module 1 has an autofocus function.
  • FIG. 3 is an exploded perspective view of the unit 100 with the shake correction function of FIG. 1 as viewed from the subject side L1.
  • FIG. 4 is an exploded perspective view of the unit 100 with the shake correction function of FIG. 1 as viewed from the image side L2.
  • the movable body 10 includes a movable frame 11 and a driving magnet 41 fixed to the movable frame 11.
  • the movable frame 11 is a frame-shaped member that surrounds the arrangement space 2.
  • the movable frame 11 includes a first frame portion 12 surrounding the + X direction side of the placement space 2, a second frame portion 13 surrounding the ⁇ X direction side of the placement space 2, and a third frame surrounding the + Y direction side of the placement space 2.
  • the third frame portion 14 and the fourth frame portion 15 include a rolling drive mechanism fixing portion 16 to which the driving magnet 41 is fixed.
  • the rolling drive mechanism fixing portions 16 are provided at two locations facing each other with the optical axis L interposed therebetween.
  • the rolling drive mechanism fixing portion 16 is a protruding portion protruding from substantially the center of the third frame portion 14 and the fourth frame portion 15 in the X direction to the side opposite to the optical axis L.
  • a concave portion for disposing the driving magnet 41 is provided on the image side L2 surface of the protruding portion, and the bottom surface of the concave portion is a magnet fixing surface 161.
  • the rolling drive mechanism fixing section 16 is provided with a movable body side stopper section (second regulated section 176) that regulates the rotation of the movable body 10 with respect to the fixed body 20.
  • rolling support mechanism fixing portions 17 are provided. As will be described later, an elastic member 31 constituting the rolling support mechanism 30 is connected to the rolling support mechanism fixing portion 17.
  • the rolling support mechanism fixing portion 17 is provided at two locations in the + Y direction side of the placement space 2 in the X-axis direction (first direction) with the rolling drive mechanism fixing portion 16 interposed therebetween, and at the ⁇ Y direction side of the placement space 2. It is provided at two locations facing each other in the X-axis direction (first direction) with the rolling drive mechanism fixing portion 16 interposed therebetween.
  • the width of the third frame portion 14 and the fourth frame portion 15 provided with the rolling drive mechanism fixing portion 16 in the Y direction is larger than the width of the first frame portion 12 and the second frame portion 13 in the X direction. large. Therefore, the movable frame 11 has a horizontally long shape in which the dimension in the Y direction is larger than the dimension in the X direction as a whole.
  • the second frame portion 13 extends linearly, but the first frame portion 12 is provided with a rectangular protruding portion 121 protruding in the + X direction at a portion excluding both ends in the Y-axis direction. On the inner peripheral side of the protruding portion 121, a concave portion 122 continuous with the arrangement space 2 is provided.
  • the fixed body 20 includes a front plate 21 and a fixed frame 22, a driving coil 42 fixed to the fixed frame 22, and a flexible printed circuit board 50.
  • the fixed frame 22 is a frame-shaped member that surrounds the movable frame 11, and has a rectangular shape that is long in the Y-axis direction when viewed from the optical axis L direction.
  • the front plate 21 is a rectangle one size smaller than the fixed frame 22 and is fixed to the end face of the fixed frame 22 on the subject side L1 with screws.
  • the front plate 21 is formed with a rectangular opening 211 overlapping the arrangement space 2 when viewed from the optical axis L direction. As described later, in a state where the movable frame 11 is arranged inside the fixed frame 22, the front plate 21 functions as a member that regulates the displacement of the movable frame 11 in the optical axis L direction.
  • the fixed frame 22 includes a first fixed frame portion 23 that surrounds the + X direction side of the movable frame 11.
  • a notch 231 in which the protrusion 121 of the frame 11 is arranged is provided.
  • the fixed frame 22 includes a second fixed frame portion 24 surrounding the ⁇ X direction side of the movable frame 11, a third fixed frame portion 25 surrounding the + Y direction side of the movable frame 11, and a ⁇ Y direction side of the movable frame 11. Is provided with a fourth fixed frame 26 surrounding the.
  • the third fixed frame portion 25, the second fixed frame portion 24, and the fourth fixed frame portion 26 surround three surfaces of the movable frame 11.
  • the third fixed frame portion 25 and the fourth fixed frame portion 26 facing each other in the Y-axis direction include a coil fixing portion 27 to which the driving coil 42 is fixed.
  • the coil fixing portions 27 are provided at two locations facing each other with the optical axis L interposed therebetween.
  • the coil fixing portion 27 is provided at a position overlapping the rolling drive mechanism fixing portion 16 provided on the movable frame 11 when viewed from the optical axis L direction.
  • the coil fixing portion 27 is a rectangular protruding portion that protrudes from the center of the third fixed frame portion 25 and the fourth fixed frame portion 26 in the X-axis direction toward the optical axis L.
  • a concave portion for arranging the driving coil 42 is formed on the surface of the protruding portion on the subject side L1, and the bottom surface of the concave portion is a coil fixing surface 271.
  • a concave groove 272 for arranging a coil wire drawn from the driving coil 42 is provided on an end surface on the optical axis L side of the coil fixing portion 27.
  • the coil fixing portion 27 is provided with a stationary body-side stopper portion (second regulating portion 286) that regulates the rotation of the movable body 10 with respect to the stationary body 20.
  • the rolling support mechanism fixing sections 17 of the movable body 10 are respectively disposed in the four rolling support mechanism arrangement sections 28.
  • an elastic member 31 constituting the rolling support mechanism 30 is connected to the rolling support mechanism disposing portion 28.
  • the rolling support mechanism arranging portion 28 is provided at two positions facing each other in the X-axis direction (first direction) with the coil fixing portion 27 on the + Y direction side interposed therebetween, and in the X-axis direction with the coil fixing portion 27 on the ⁇ Y direction side interposed therebetween. It is provided at two places facing each other in the (first direction).
  • a wiring recess 29 is formed on the image side L2 of the fixed frame 22 on the subject side L1 in the optical axis L direction.
  • the wiring recess 29 is recessed into a shape in which the flexible printed board 50 can be arranged.
  • the flexible printed board 50 includes a first rectangular portion 51 and a second rectangular portion 52 provided with lands to which the coil wires of the driving coil 42 are connected, and a first rectangular portion 51.
  • the flexible printed board 50 is configured by fixing a reinforcing plate to a flexible board.
  • the reinforcing plate is provided at a portion other than the drawer portion 54, and the drawer portion 54 is formed only of a flexible substrate.
  • connection portion 53 extends from the first rectangular portion 51 in the ⁇ X direction and bends in the + Y direction, extends linearly in the Y-axis direction, bends in the + X direction, and is connected to the second rectangular portion 52.
  • the drawer portion 54 extends in the + Y direction through a notch 251 formed on the outer peripheral edge of the third fixed frame 25.
  • the Hall element 60 is mounted on the second rectangular portion 52 located closer to the drawer portion 54.
  • the wiring recess 29 includes a first recess 291 in which the first rectangular portion 51 is arranged, a second recess 292 in which the second rectangular portion 52 is arranged, and a third recess 293 in which the connection portion 53 is arranged.
  • the first rectangular portion 51 is formed on the surface on the image side L2 of the rolling drive mechanism fixing portion 16 provided on the fourth fixing frame portion 26.
  • the second rectangular portion 52 is formed on the image-side L2 surface of the rolling drive mechanism fixing portion 16 provided in the third fixed frame portion 25.
  • the first rectangular portion 51 and the second rectangular portion 52 are connected to the concave groove 272, and the coil wire can be routed from the coil fixing portion 27 via the concave groove 272.
  • the wiring concave portion 29 is provided with the Hall element 60 mounted on the second rectangular portion 52 and the driving device mounted on the movable body 10.
  • the shape is such that the distance from the magnet 41 in the direction of the optical axis L is a predetermined distance.
  • the depth of the wiring recess 29 in the optical axis L direction is larger than the total thickness of the second rectangular portion 52 of the flexible printed circuit board 50 and the Hall element 60 in the optical axis L direction.
  • the rolling drive mechanism 40 is provided at two locations on the + Y direction side of the arrangement space 2 and on the ⁇ Y direction side of the arrangement space 2 with the optical axis L interposed therebetween. It is provided at a plurality of positions.
  • Each rolling drive mechanism 40 includes a drive magnet 41 and a drive coil 42, respectively.
  • a driving magnet 41 is arranged on the movable body 10
  • a driving coil 42 is arranged on the fixed body 20.
  • the driven coil 42 faces the optical axis L direction.
  • the two sets of rolling drive mechanisms 40 each have a drive magnet 41 and a drive coil 42 that face each other in the optical axis L direction and have a diameter about the optical axis L with respect to the arrangement space 2. It is located outside the direction.
  • each of the two sets of rolling drive mechanisms 40 overlaps with the movable body 10 when viewed from the radial direction. That is, the driving magnet 41 is held at a position overlapping the movable frame 11 when viewed from the radial direction.
  • the driving coil 42 mounted on the fixed body 20 is disposed at a position overlapping the movable frame 11 when viewed from the radial direction. Therefore, the rolling drive mechanism 40 is arranged within the range of the height of the movable frame 11 in the optical axis L direction.
  • Each of the two sets of rolling drive mechanisms 40 overlaps with the rolling support mechanism 30 when viewed from the radial direction.
  • the rolling support mechanism 30 includes an elastic member 31 that connects the movable frame 11 and the fixed frame 22, and the rolling drive mechanism 40 overlaps the elastic member 31 when viewed from the radial direction.
  • the driving magnet 41 is divided into two parts in the X-axis direction, and the magnetic pole of the image side L2 facing the driving coil 42 extends in the Y-axis direction. It is magnetized differently from the border.
  • the drive coil 42 is an oval air-core coil that is long in the Y-axis direction, and two long sides on the + X direction side and the ⁇ X direction side are used as effective sides. Note that, as the driving coil 42, a pattern substrate (coil substrate) in which a coil is taken in a substrate wiring as a pattern may be used instead of the air-core coil.
  • the driving magnet 41 of one of the two sets of rolling drive mechanisms 40 is disposed at a position overlapping the Hall element 60 mounted on the flexible printed circuit board 50 when viewed from the optical axis L direction.
  • the driving magnet 41 and the Hall element 60 arranged on the + Y direction side with respect to the optical axis L overlap when viewed from the optical axis L direction.
  • the rolling drive mechanism 40 is driven so as to correct the shake. That is, a current flows through the drive coils 42 of the two sets of rolling drive mechanisms 40 so as to move the movable body 10 in a direction to cancel the shake of the optical module 1 and the movable body 10, and the shake around the optical axis L is corrected. .
  • the optical module 1 incorporates the shake correction drive mechanism 3 including the magnet 4 and the coil 5, but the drive module 41 has a center G 0 in the optical axis L direction.
  • the position in the optical axis L direction is L0. That is, the driving magnet 41 and the magnet 4 are arranged such that the center G0 of the driving magnet 41 in the optical axis L direction and the center G1 of the magnet 4 in the optical axis L direction overlap when viewed from the radial direction.
  • FIG. 5 is a perspective view of the unit 100 with the shake correction function from which the front plate 21 is removed, as viewed from the subject side L1
  • FIG. 6 is a partially enlarged view of the rolling support mechanism 30 as viewed from the subject side L1 (part of FIG. (Enlarged view).
  • FIG. 7 is a perspective view of the unit 100 with the shake correction function from which the front plate 21 is removed, as viewed from the image side L2.
  • FIG. 8 is a partially enlarged view of the rolling support mechanism 30 as viewed from the image side L2 (FIG. FIG. As shown in FIGS. 5 and 7, the rolling support mechanisms 30 are provided at a plurality of positions around the optical axis L.
  • the rolling support mechanism 30 is orthogonal to the optical axis L and inclined at a predetermined angle with respect to the X-axis direction and the Y-axis direction on the first axis R1; It is provided at two places on the second axis R2 that intersects the one axis R1.
  • Each rolling support mechanism 30 includes a rolling support mechanism fixing portion 17 provided on the movable frame 11, a rolling support mechanism disposing portion 28 provided on the fixed frame 22, and an elastic member connecting the movable frame 11 and the fixed frame 22. 31.
  • the rolling support mechanism fixing portions 17 are convex portions protruding from the four corners of the movable frame 11, and the rolling support mechanism disposing portions 28 are concave portions formed at the four corners of the fixing frame 22.
  • the interval between the two sets of rolling support mechanisms 30 facing each other in the X-axis direction (first direction) across the rolling drive mechanism 40 is two sets of rolling support mechanisms facing each other in the Y-axis direction (second direction). Narrower than 30 intervals.
  • the rolling support mechanism fixing portions 17 provided at a plurality of positions in the circumferential direction around the optical axis, two rolling support mechanism fixing portions opposed to each other in the X-axis direction (first direction).
  • the four rolling support mechanism fixing parts are fixed such that the distance between the two rolling support mechanism fixing parts 17 opposed in the Y axis direction (second direction) orthogonal to the X axis direction is larger than the distance between the parts 17.
  • the part 17 is arranged.
  • the rolling drive mechanism fixing portion 16 is provided at a position facing the optical axis L in the Y-axis direction (second direction).
  • the size of the movable frame 11 in the X-axis direction (first direction) is obtained. Can be reduced.
  • FIG. 9 is a perspective view of the elastic member 31.
  • the elastic member 31 is formed as a leaf spring by bending a plate material. As shown in FIG. 9, the elastic member 31 has a shape in which an end of a U-shaped leaf spring extending in the direction of the optical axis L is bent in a direction orthogonal to the optical axis L, and has one end 32 and the other end 33. And a first elastic portion 34 and a second elastic portion 35.
  • the first elastic portion 34 extends in the direction of the optical axis L, and the second elastic portion 35 extends in a direction orthogonal to the optical axis L.
  • the first elastic portion 34 includes a first portion 341 and a second portion 342 extending in parallel along the optical axis L direction, and a semicircular curved portion 343 connecting the first portion 341 and the second portion 342.
  • the first portion 341, the second portion 342, and the curved portion 343 have a flat plate shape and are located on the same plane.
  • the first portion 341 and the second portion 342 have respective sides opposite to the side connected to the curved portion 343 connected to the second elastic portion 35 extending in a direction orthogonal to the optical axis L direction.
  • the second elastic part 35 connected to the first part 341 is connected to one end 32, and the second elastic part 35 connected to the second part 342 is connected to the other end 33.
  • the one end portion 32 and the other end portion 33 extend in the width direction of the second elastic portion 35, and extend from the end of the second elastic portion 35 in opposite directions.
  • the second elastic portion 35 has a shape whose width increases toward the one end portion 32 and the other end portion 33, and has a shape in which the strength of a connection portion with the one end portion 32 and the other end portion 33 is increased.
  • the elastic member 31 is arranged in a posture in which the curved portion 343 protrudes toward the subject side L1.
  • one of the one end 32 and the other end 33 is fixed to the movable frame 11, and the other is fixed to the fixed frame 22.
  • one end portion 32 and the other end portion 33 are respectively provided at two places separated in the plate surface direction of the first elastic portion 34 (in other words, directions in which the first elastic portion 34 elastically deforms). Holes are formed at two locations separated in a direction orthogonal to the direction perpendicular to the direction.
  • One hole is a circular positioning hole 361, and the other hole is a long hole 371.
  • the fixed frame 22 and the movable frame 11 are formed with a positioning portion 362 and a rotation restricting portion 372, respectively. Both the positioning part 362 and the rotation restricting part 372 are convex parts.
  • the elastic member 31 is fixed to the movable frame 11, and then the movable frame 11 is inserted into the fixed frame 22 to fix the elastic member 31 to the fixed frame.
  • the positioning portion 362 of the movable frame 11 is inserted into a positioning hole 361 provided in one of the one end 32 and the other end 33 and welded.
  • the rotation restricting portion 372 of the movable frame 11 is inserted into the elongated hole 371 and welded. Thereby, the fixing operation of the elastic member 31 to the movable frame 11 is completed.
  • the movable frame 11 is inserted into the fixed frame 22, the positioning portion 362 of the fixed frame 22 is inserted into the positioning hole 361 of the elastic member 31 and welded, and the rotation restricting portion 372 of the fixed frame 22 is inserted into the elongated hole 371. And weld.
  • the fixing operation of the elastic member 31 to the fixed frame 22 is completed, and the movable frame 11 is held by the fixed frame 22 via the elastic member 31.
  • the fixed frame 22, the movable frame 11, and the elastic member 31 can be assembled in a state where no load is applied to the elastic member 31. Therefore, the assembling work is easy, and the assembling property is improved. Further, the positional accuracy of the movable frame 11 with respect to the fixed frame 22 can be improved.
  • one end portion 32 and the other end portion 33 are provided on the inner surface of the rolling support mechanism disposing portion 28 provided on the fixed frame 22 and the rolling support mechanism fixing portion 17 provided on the movable frame 11. It is arranged on both sides of the gap with the outer surface.
  • the second elastic portion 35 extends from the one end portion 32 and the other end portion 33 in a direction crossing the radial direction, and the thickness direction of the second elastic portion 35 faces the optical axis L direction.
  • One of the two second elastic portions 35 connected to the one end 32 and the other end 33 is located at a position overlapping the groove 171 formed on the outer surface of the rolling support mechanism fixing portion 17 in the optical axis L direction.
  • the second elastic portion 35 overlapping at least the groove portion 171 in the optical axis L direction can be elastically deformed in the optical axis L direction, and can generate an elastic force in the optical axis L direction.
  • the second elastic portion 35 buckles the first elastic portion 34 extending in the optical axis L direction when an impact is applied to the fixed frame 22 to move the movable frame 11 in the optical axis L direction due to dropping or the like. Can be suppressed, and unintended plastic deformation of the first elastic portion 34 can be suppressed. Further, when the movable frame 11 is displaced in the optical axis L direction with respect to the fixed frame 22, the movable frame 11 can be returned to the original position by the elastic force of the second elastic portion 35.
  • one of the first portion 341 and the second portion 342 is disposed in a groove 281 formed on the inner surface of the rolling support mechanism disposing portion 28, and the other is disposed on the outer surface of the rolling support mechanism fixing portion 17. It is arranged in the formed groove 171.
  • the thickness direction of the first elastic portion 34 is oriented in the circumferential direction.
  • the grooves 281 and 171 have a predetermined width in the circumferential direction.
  • the elastic member 31 allows the movable frame 11 to return to its original position by the elastic force of the first elastic portion 34 when the movable frame 11 rotates around the optical axis L with respect to the fixed frame 22 due to inertial force, impact, or the like. Can be. Further, since the first elastic portion 34 includes the first portion 341 and the second portion 342, the amount of deformation of the first portion 341 and the second portion 342 is reduced to half of the amount of rotation of the movable frame 11 with respect to the fixed frame 22. can do. Accordingly, since the load applied to the first elastic portion 34 can be reduced, the durability against impact can be increased, and the buckling of the first elastic portion 34 can be suppressed.
  • the elastic members are provided at two places opposing each other in the direction of the first axis R1 across the optical axis L and two places opposing each other in the direction of the second axis R2 across the optical axis L. 31 are arranged.
  • the two elastic members 31 facing each other in the direction of the first axis R1 with the optical axis L interposed therebetween cause the first elastic portion 34 to generate an elastic force in the direction of the second axis R2.
  • the two elastic members 31 facing each other in the direction of the second axis R2 with the optical axis L interposed therebetween cause the first elastic portion 34 to generate an elastic force in the direction of the first axis R1. Therefore, the four elastic members 31 can generate an elastic force in the direction around the optical axis L as a whole.
  • the rolling support mechanism fixing portion 17 provided on the movable frame 11 includes protrusions 172 and 173 formed on both sides of the groove 171 in the circumferential direction.
  • the radially outer side surfaces of the convex portions 172 and 173 are first regulated portions 174 (see FIG. 6) divided in the circumferential direction by the groove portions 171.
  • the side surfaces on both sides in the circumferential direction of the rolling support mechanism fixing portion 17 are second regulated portions 175 and 176 facing the opposite side in the circumferential direction (see FIGS. 4, 6, and 8).
  • the second regulated portion 175 is a side surface of the convex portion 172.
  • the second regulated portion 176 is a movable body side stopper provided in the rolling drive mechanism fixing portion 16. As shown in FIGS. 4 and 7, the second regulated portion 176 is a side surface extending in the Y-axis direction on both sides in the circumferential direction of the magnet fixing surface 161 of the rolling drive mechanism fixing portion 16.
  • the fixed frame 22 has, on the inner surface of the rolling support mechanism disposing portion 28, a first regulating portion 284 radially facing the first regulated portion 174, and a second regulating portion 175 and 176 circumferentially facing the second regulated portion 175, 176. Regulators 285 and 286 are provided.
  • the first regulated portion 174 and the first regulated portion 284 are arc-shaped curved surfaces centered on the optical axis L, and serve to displace the movable frame 11 with respect to the fixed frame 22 in the first axis R1 direction and the second axis R2 direction.
  • the first stopper part for regulating is constituted.
  • the second regulated portions 175 and 176 and the second regulated portions 285 and 286 constitute a second stopper that regulates displacement of the movable frame 11 around the optical axis L with respect to the fixed frame 22.
  • the second restricting portion 286 is a fixed body side stopper provided on the coil fixing portion 27. As shown in FIGS. 7 and 8, the second restricting portions 286 are side surfaces extending in the Y-axis direction on both circumferential sides of the coil fixing portion 27.
  • the convex portion 172 of the rolling support mechanism fixing portion 17 has a third regulated portion 177 (see FIG. 3) which is an end face facing one side (subject side L1) in the optical axis L direction, and the other side (in the optical axis L direction).
  • a third regulated portion 178 (see FIG. 4), which is an end surface facing the image side L2), is provided.
  • the fixed frame 22 includes a third regulating portion 287 that protrudes from the end of the image side L2 on the inner surface of the rolling support mechanism disposing portion 28 to the inner peripheral side.
  • the convex portion 172 overlaps the front plate 21 and the third regulating portion 287 when viewed from the optical axis L direction.
  • the third regulated portion 177 faces the front plate 21 in the optical axis L direction, and the third regulated portion.
  • the portion 178 and the third regulating portion 287 face each other in the optical axis L direction. Therefore, the front plate 21, the third regulating portion 287, and the third regulated portions 177, 178 constitute a third stopper portion that regulates the displacement of the movable frame 11 with respect to the fixed frame 22 in the optical axis L direction.
  • the unit 100 with the shake correction function of the present embodiment includes the rolling drive mechanism 40 and the rolling support mechanism 30, and can rotate the movable body 10 capable of holding the optical module 1 around the optical axis L. it can. Therefore, since the shake correction in the rolling direction can be performed, the disturbance of the captured image by the optical module 1 can be suppressed. Further, since the driving magnet 41 and the driving coil 42 constituting the rolling drive mechanism 40 are arranged radially outward with respect to the arrangement space 2 of the optical module 1, the arrangement space 2 of the optical module 1 and the rolling drive There is no need to displace the mechanism 40 in the direction of the optical axis L.
  • the rolling drive mechanism 40 since the drive magnet 41 and the drive coil 42 face each other in the optical axis L direction, the magnetic field of the rolling drive mechanism 40 does not easily enter the space where the optical module 1 is arranged. Therefore, magnetic interference between the movable body 10 and the rolling drive mechanism 40 can be suppressed.
  • the rolling drive mechanism 40 overlaps with the movable body 10 when viewed from the radial direction.
  • the rolling support mechanism 30 overlaps with the movable body 10 and the rolling drive mechanism 40 when viewed from the radial direction.
  • the optical module 1 is provided with a magnetic drive mechanism including the magnet 4 and the coil 5.
  • the center G 1 of the magnet 4 in the optical axis L direction in the optical module 1 and the drive magnet 41 in the optical axis L direction are provided.
  • the center G0 overlaps when viewed from the radial direction.
  • the movable body 10 of the present embodiment includes the rolling drive mechanism fixing portion 16 on which the driving magnet 41 is disposed, and the rolling drive mechanism fixing portion 16 includes the second regulated portion 176 that is a movable body side stopper.
  • the fixed body 20 includes a coil fixing portion 27 on which the driving coil 42 is disposed, and the coil fixing portion 27 includes a second regulating portion 286 that is a fixed body-side stopper.
  • the driving coil 42 is disposed on the fixed body 20, and the driving magnet 41 is disposed on the movable body 10. Therefore, there is no need to provide a wiring member for supplying power to the driving coil 42 on the movable body 10, so there is no need to secure a space for the wiring member to move, and wiring is easy. Further, since no stress is applied to the wiring member during the operation of the movable body 10, it is possible to prevent a reduction in the accuracy of the shake correction due to the stress, and to perform the rolling correction with high accuracy. Further, no control or power is required for preventing the accuracy of the shake correction from lowering.
  • the present invention can also be applied to a configuration in which the driving coil 42 is disposed on the movable body 10 and the driving magnet 41 is disposed on the fixed body 20.
  • the rolling drive mechanism 40 is disposed at two positions on opposite sides of the optical axis L. Therefore, the bias of the center of gravity of the movable body 10 can be suppressed as compared with the case where the rolling drive mechanism 40 is provided only at one place. Therefore, it is possible to suppress a decrease in the accuracy of the shake correction due to the deviation of the center of gravity, and it is possible to accurately perform the rolling correction. Further, there is no need to provide a counterweight to suppress the deviation of the center of gravity. Further, by providing a plurality of rolling drive mechanisms 40, shake correction can be performed with a large torque.
  • the number of the rolling drive mechanisms 40 is not limited to two, but may be three or more. For example, it may be provided at four locations at equal angular intervals.
  • the rolling support mechanism 30 is provided at a plurality of positions in the circumferential direction around the optical axis L, and the plurality of positions are opposed to each other in the X-axis direction (first direction) orthogonal to the optical axis L direction. And a position facing in the Y axis direction (second direction) orthogonal to the optical axis L direction and the X axis direction.
  • the spacing between the rolling support mechanisms 30 facing each other in the X-axis direction (first direction) is smaller than the spacing between the rolling support mechanisms 30 facing each other in the Y-axis direction (second direction).
  • the size of the unit 100 with the shake correction function is not increased in the X-axis direction (first direction) due to the provision of the rolling drive mechanism 40, Can be reduced in the X-axis direction (first direction) orthogonal to. Therefore, the size in the X-axis direction can be reduced in addition to the thickness in the direction of the optical axis L.
  • the fixed body 20 includes the fixed frame 22 provided with the wiring recess 29 recessed in the direction of the optical axis L, and the flexible printed board 50 connected to the driving coil 42.
  • the shape is such that the distance between the Hall element 60 mounted on the flexible printed board 50 disposed in the wiring recess 29 and the driving magnet 41 is a predetermined distance. By doing so, it is possible to prevent the flexible printed board 50 from jumping out of the fixed frame 22 in the optical axis L direction. Therefore, it is possible to reduce the thickness of the unit 100 with the shake correction function in the direction of the optical axis L.
  • the Hall element 60 can be positioned by arranging the flexible printed circuit board 50 in the wiring recess 29, the positioning of the Hall element 60 is easy.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adjustment Of Camera Lenses (AREA)
PCT/JP2019/035386 2018-09-27 2019-09-09 振れ補正機能付きユニット Ceased WO2020066572A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US17/279,104 US11982865B2 (en) 2018-09-27 2019-09-09 Unit with shake correction function
CN201980060290.XA CN112703449B (zh) 2018-09-27 2019-09-09 带抖动修正功能的单元

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JP2018-181675 2018-09-27
JP2018181675A JP7186047B2 (ja) 2018-09-27 2018-09-27 振れ補正機能付きユニット

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JP2020052248A (ja) 2020-04-02
US20210389550A1 (en) 2021-12-16
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JP7186047B2 (ja) 2022-12-08
US11982865B2 (en) 2024-05-14

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