WO2013069302A1 - Dispositif de correction de flou d'image et tube d'objectif - Google Patents

Dispositif de correction de flou d'image et tube d'objectif Download PDF

Info

Publication number
WO2013069302A1
WO2013069302A1 PCT/JP2012/007211 JP2012007211W WO2013069302A1 WO 2013069302 A1 WO2013069302 A1 WO 2013069302A1 JP 2012007211 W JP2012007211 W JP 2012007211W WO 2013069302 A1 WO2013069302 A1 WO 2013069302A1
Authority
WO
WIPO (PCT)
Prior art keywords
frame
image blur
blur correction
movable frame
optical axis
Prior art date
Application number
PCT/JP2012/007211
Other languages
English (en)
Japanese (ja)
Inventor
広康 藤中
Original Assignee
パナソニック株式会社
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 パナソニック株式会社 filed Critical パナソニック株式会社
Publication of WO2013069302A1 publication Critical patent/WO2013069302A1/fr

Links

Images

Classifications

    • 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
    • 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
    • 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
    • G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B2205/0007—Movement of one or more optical elements for control of motion blur
    • G03B2205/0015—Movement of one or more optical elements for control of motion blur by displacing one or more optical elements normal to the optical axis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • H04N23/685—Vibration or motion blur correction performed by mechanical compensation
    • H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position

Definitions

  • the technology disclosed herein relates to an image blur correction device provided in a lens barrel or the like used in an imaging device.
  • an imaging apparatus that can correct image blur by moving a part of a lens.
  • Such an imaging apparatus includes an image blur correction apparatus having a fixed frame, a movable frame, and an actuator.
  • the movable frame holds a lens, and image blur is corrected by being moved by an actuator (see, for example, Patent Document 1).
  • such an imaging apparatus has the following problems. That is, the image blur correction device is held by the main body frame that holds the lens. In that case, the movable frame of the image blur correction device is positioned by the fixed frame, and the fixed frame is held by the main body frame. For this reason, in such an imaging apparatus, there is a possibility that the positional accuracy error between the movable frame and the fixed frame and the positional accuracy error between the fixed frame and the main body frame accumulate, and the relative error between the lenses increases. It was.
  • an object of the technology disclosed herein is to provide an image blur correction device capable of improving the relative positional accuracy between lenses.
  • an image blur correction device includes a movable frame and a fixed frame.
  • the movable frame is movable in a plane perpendicular to the optical axis, and includes a first lens and a protrusion extending in the optical axis direction.
  • the protrusion extends in the optical axis direction.
  • the fixed frame holds the movable frame directly or indirectly, and has a second lens and a hole. The hole portion restricts the movement of the movable frame in a plane perpendicular to the optical axis direction by inserting the protrusion.
  • an image blur correction device includes a movable frame and a fixed frame.
  • the movable frame is movable in a plane perpendicular to the optical axis, and has a first lens and a hole formed along the optical axis direction.
  • the fixed frame holds the movable frame directly or indirectly, and has a second lens and a protrusion.
  • the protrusion extends in the optical axis direction, and is inserted into the hole to restrict the movement of the movable frame in a plane perpendicular to the optical axis direction to a predetermined range.
  • FIG. 1 is an exploded perspective view of a lens barrel according to an embodiment of the present technology.
  • FIG. 2 is an exploded perspective view of an image blur correction device included in the lens barrel of FIG. 1.
  • FIG. 3 is a side view of the image blur correction device in FIG. 2.
  • FIG. 2 is an exploded perspective view of a shutter device included in the lens barrel of FIG. 1.
  • FIGS. 3A to 3C are top views of shield plates included in the lens barrel of FIG.
  • FIGS. 4A to 4C are diagrams showing an operational relationship between an actuator and a shield plate included in the lens barrel of FIG.
  • FIGS. 4A to 4E are views showing the shape of a shielding member included in the lens barrel of FIG. (A), (b) is an expanded sectional view of the lens barrel which shows the periphery of the shielding member of FIG.
  • FIG. 1 is an exploded perspective view of the lens barrel 1 according to the first embodiment.
  • the lens barrel 1 according to the present embodiment includes a first group frame 100, a second group frame 200, a zoom motor 300, a shutter device 400, an image blur correction device 500, a fourth group frame 600, a focus motor 700, and an image sensor 800. ing.
  • the lens barrel 1 forms an image of a light beam on the image sensor 800 by an optical system composed of a plurality of optical elements provided inside.
  • the first group frame 100 includes at least one lens constituting the optical system and a prism (not shown) that bends the light beam by 90 °.
  • the second group frame 200 holds at least one lens constituting the optical system.
  • the second group frame 200 is held by the first group frame 100 so as to be movable in the direction of the optical axis X in the space within the first group frame 100.
  • the zoom motor 300 is attached to the side surface of the first group frame 100.
  • the zoom motor 300 moves the second group frame 200 installed in the first group frame 100 in the optical axis X direction in the first group frame 100.
  • the shutter device 400 determines the amount of light hitting the image sensor 800 by controlling the exposure time.
  • the shutter device 400 is attached to the image sensor 800 side of the first group frame 100.
  • the image blur correction apparatus 500 includes a movable frame 510, a third group frame (frame body) 520, a fixed frame 530, and a flexible printed board 540.
  • the image blur correction apparatus 500 corrects image blur by moving a movable frame 510 having a lens 511 (see FIG. 2) in a plane perpendicular to the optical axis X.
  • the movable frame 510 has a magnet 513 and a magnet 515.
  • the movable frame 510 is supported so as to be movable in a plane direction perpendicular to the optical axis X with respect to the third group frame 520.
  • the third group frame 520 includes a hall element (magnetic sensor) 522, a coil 523, a hall element (magnetic sensor) 524, and a coil 525.
  • the third group frame 520 is attached to the image sensor 800 side of the shutter device 400.
  • the third group frame 520 is held by a fixed frame 530.
  • the fixed frame 530 holds the third group frame 520.
  • the fixed frame 530 holds the fourth group frame 600 in the internal space in a slidable state in the optical axis X direction.
  • a focus motor 700 is attached to the side surface of the fixed frame 530.
  • An imaging element 800 is attached to the fixed frame 530 via a shielding member 830 and a sheet metal 810.
  • the flexible printed circuit board 540 is electrically connected to the hall element 522, the coil 523, the hall element 524, and the coil 525.
  • the flexible printed board 540 is electrically connected to the flexible printed board 10 of the lens barrel 1.
  • the image blur correction apparatus 500 will be described in detail later.
  • the fourth group frame 600 holds a lens for focusing.
  • the fourth group frame 600 is driven in the optical axis X direction within the fixed frame 530 by the focus motor 700.
  • the focus motor 700 is attached to the side surface of the fixed frame 530.
  • the focus motor 700 adjusts the focus by driving the fourth group frame 600 in the optical axis X direction.
  • the image sensor 800 is bonded and fixed to the sheet metal 810.
  • the sheet metal 810 is fixed to the fixed frame 530 with the shielding member 830 sandwiched therebetween.
  • the image sensor 800 is electrically connected to the flexible printed circuit board 820.
  • the lens barrel 1 of the present embodiment has the above-described configuration, and is fixed in a state where the first group frame 100, the shutter device 400, the image blur correction device 500, and the image sensor 800 are stacked in the optical axis direction.
  • an optical system is configured.
  • the flexible printed circuit board 10 is wound around the lens barrel 1 and fixed.
  • the flexible printed circuit board 10 the flexible printed circuit board 410, and the fixed frame 530 are connected to the terminals of the flexible printed circuit board 820, the zoom motor 300, the shutter device 400, the image blur correction device 500, the focus motor 700, and the image sensor 800 are arranged. Connected to the control circuit.
  • the lens barrel 1 can be zoomed by changing the focal length of the optical system by driving the zoom motor 300 and changing the position of the second group frame 200. Further, focusing can be achieved by driving the focus motor 700 in accordance with the position of the second group frame 200 and the distance to the subject and changing the position of the fourth group frame 600. In addition, when an image blur occurs when the entire camera vibrates, the image blur can be suppressed by controlling the position of the movable frame 510 so as to move the image blur in a direction to cancel the blur. .
  • FIG. 2 is an exploded perspective view of the image blur correction apparatus 500 according to the present embodiment.
  • FIG. 3 is a side view of the image blur correction apparatus 500 according to the present embodiment.
  • the image blur correction apparatus 500 includes a movable frame 510, a third group frame 520, a fixed frame 530, and a flexible printed circuit board 540.
  • the movable frame 510 includes a lens 511, a shield plate 512, a magnet 513, a shield plate 514, and a magnet 515.
  • the lens 511 is a lens that corrects image blur and is held by the movable frame 510.
  • the shield plate 512 is provided to shield the magnetism of the magnet 513.
  • the shield plate 512 is disposed between the movable frame 510 and the magnet 513 and is bonded to the movable frame 510.
  • the magnet 513 is a magnet constituting an actuator that rotates and moves the movable frame 510, and is bonded to the shield plate 512.
  • the shield plate 514 is provided to shield the magnetism of the magnet 515 and the shutter actuator 430.
  • the shield plate 514 is disposed between the movable frame 510 and the magnet 515, and is adhered to the movable frame 510 at a projecting portion 514b (see FIG. 5) described later.
  • the magnet 515 is a magnet that constitutes an actuator that translates the movable frame 510 and is attracted to the shield plate 514 by a magnetic force.
  • the magnet 515 is nickel-plated for rust prevention. For this reason, it is difficult to adhere to the movable frame 510 with an adhesive or the like. Therefore, in the present embodiment, the magnet 515 is attracted to the iron shield plate 514 by a magnetic force, and the shield plate 514 is adhered to the movable frame 510, so that the magnet 515 is also indirectly attached to the movable frame 510. It is fixed against.
  • the movable frame 510 is formed with a U groove 516, a U groove 517, and a U groove 518.
  • the U-groove 516, the U-groove 517, and the U-groove 518 are notches having a substantially U shape in cross-sectional view.
  • the U groove 516, the U groove 517, and the U groove 518 are engaged with a slide shaft 526, a slide shaft 527, and a slide shaft 528, which will be described later, respectively.
  • the movable frame 510 when the U groove 516 is engaged with the slide shaft 526, the movable frame 510 can be translated and the movable frame 510 can be rotated about the slide shaft 526.
  • the U groove 517 restricts the movement of the movable frame 510 in the optical axis X direction by being engaged with the slide shaft 527.
  • the U groove 518 is engaged with the slide shaft 528 to restrict the movement of the movable frame 510 in the optical axis X direction and the inclination of the movable frame 510.
  • the movable frame 510 is formed with a protrusion 519 extending from the surface on the image sensor 800 side in the optical axis X direction of the movable frame 510.
  • the protruding portion 519 is inserted into the hole portion 532 formed in the fixed frame 530 in a state where the protruding portion 519 is inserted through the through portion 521 c formed in the third group frame 520.
  • the movement range of the movable frame 510 in a plane perpendicular to the optical axis X is restricted.
  • an opening 521a is formed at a position facing the lens 511.
  • a notch 521b is formed on the side wall of the third group frame 520. The notch 521b allows the movable frame 510 to be assembled to the third group frame 520 from the direction perpendicular to the optical axis X even when the slide shafts 526, 527, and 528 are fixed to the third group frame 520.
  • a wall portion 461 (see FIG. 4) extending in the optical axis X direction is formed on the side wall of the shutter device 400 at a position corresponding to the cutout portion 521b of the third group frame 520.
  • the shutter device 400 and the third group frame 520 are overlapped and fixed in the optical axis X direction so that no opening is formed on the side wall of the image blur correction device 500.
  • the third group frame 520 has a through-hole 521c so that the third group frame 520 and the movable frame 510 do not interfere with each other when the movable frame 510 is moved and when the movable frame 510 and the third group frame 520 are assembled. Is formed.
  • the through portion 521c allows the protrusion 519 to be inserted into the hole 532 through the third group frame 520.
  • the fixed frame 530 holds the movable frame 510 indirectly via the third group frame 520.
  • the third group frame 520 includes a hall element 522, a coil 523, a hall element 524, and a coil 525.
  • the Hall element 522 is bonded to the third group frame 520 in parallel with the coil 523 in order to detect the amount of rotational movement of the movable frame 510.
  • the coil 523 constitutes an actuator that rotates and moves the movable frame 510.
  • the coil 523 is bonded to a position facing the magnet 513 in the third group frame 520.
  • the Hall element 524 is bonded to the third group frame 520 in parallel with the coil 525 in order to detect the amount of translational movement of the movable frame 510.
  • the coil 525 constitutes an actuator that translates the movable frame 510.
  • the coil 525 is bonded to a position facing the magnet 515 in the third group frame 520.
  • the third group frame 520 includes a slide shaft 526, a slide shaft 527, and a slide shaft 528. As described above, the slide shaft 526, the slide shaft 527, and the slide shaft 528 are engaged with the U groove 516, the U groove 517, and the U groove 518, respectively.
  • the movable frame 510 is held by the third group frame 520 movably in a plane perpendicular to the optical axis X by engaging the U groove 517 and the U groove 518 with the slide shaft 527 and the slide shaft 528, respectively.
  • the movable frame 510 is supported so as to be rotatable and slidable around the slide shaft 526 by engaging the U groove 516 with the slide shaft 526.
  • the fixed frame 530 includes an opening formed along the optical axis X direction and a lens 531 provided in the opening on the image sensor 800 side.
  • the fixed frame 530 holds the third group frame 520 on the subject-side end surface.
  • the fixed frame 530 has a hole 532 that is recessed in the direction of the optical axis X on the end surface on the subject side. Then, the movable frame 510, the third group frame 520, and the fixed frame 530 are overlapped and fixed in the optical axis X direction, whereby the protrusion 519 of the movable frame 510 is inserted into the hole 532 of the fixed frame 530.
  • the hole portion 532 is formed as a substantially rectangular hole in plan view, and is provided in the vicinity of the positioning reference position on the end surface of the fixed frame 530 on the subject side.
  • the positioning reference position refers to a substantially rectangular hole in a state where the protrusion 519 on the movable frame 510 side is inserted into the hole 532 on the fixed frame 530 side when the movable frame 510 is attached to the fixed frame 530.
  • the protruding portion 519 is moved from the state in which the protruding portion 519 is in contact with the first wall surface of the portion 532 to the second wall surface facing the same, and the third wall surface and the second wall surface facing the third wall surface are similarly moved in the direction orthogonal thereto.
  • a positioning reference position for setting the center position in two directions orthogonal to the optical axis direction based on the outputs of the Hall element outputs 522 and 524 when the protrusion 519 is moved between the four wall surfaces Means a position.
  • the positioning reference position where the hole 532 is formed is near the end on the left side in the drawing.
  • the size of the substantially square hole 532 is formed to be slightly larger than the diameter of the protrusion 519. Therefore, the movable frame 510 can move within the clearance generated between the inner peripheral surface of the hole 532 and the outer peripheral surface of the protrusion 519.
  • the protrusion 519 is inserted into the hole 532 so that the movement of the movable frame 510 in the plane perpendicular to the optical axis X is restricted within a predetermined range and the positioning process described above is performed. Can do.
  • the image blur correction device 500 in which the relative positional accuracy between the lenses is improved.
  • the performance of the optical system is the highest.
  • the performance of the optical system deteriorates as it deviates from the coaxial state.
  • the image blur correction apparatus 500 according to the present embodiment can improve the positional accuracy between the lenses with the above-described configuration, and thus can reduce the deterioration of the optical performance in design. Therefore, by using the image blur correction device 500, it is possible to provide the lens barrel 1 having high average performance including variation.
  • the image blur correction apparatus 500 of the present embodiment can also provide the following useful effects. That is, the image blur correction apparatus 500 has a small number of parts and is easy to assemble.
  • the image blur correction apparatus 500 has a small number of parts and is easy to assemble.
  • the third group frame 520 generally, in order to engage the U groove portion and the slide shaft, another member is attached after the slide shaft is engaged with the U groove portion. It is necessary to assemble.
  • the protrusion 519 formed on the movable frame 510 is inserted into the hole 532 formed on the fixed frame 530.
  • a separate member becomes unnecessary.
  • a cutout portion 521b is formed on the side wall of the third group frame 520. Therefore, even when the slide shafts 526, 527, and 528 are fixed to the third group frame 520, the movable frame 510 can be assembled to the third group frame 520 from the direction perpendicular to the optical axis X. Therefore, the image blur correction apparatus 500 is easy to assemble.
  • the image blur correction apparatus 500 can suppress deterioration in performance. That is, in the method of restricting the movement of the movable frame 510 by adding another member, the performance deteriorates due to backlash or deformation when the separate member is fixed to the movable frame 510 and the third group frame 520. There is a risk that. Further, in the method of inserting the slide shaft afterwards, there is a possibility that the performance deteriorates due to the occurrence of defects such as scratches on the U-groove portion when the slide shaft is inserted.
  • the image blur correction apparatus 500 of the present embodiment inserts the protrusion 519 formed integrally with the movable frame 510 into the hole 532, thereby moving the movable frame 510 in a plane perpendicular to the optical axis X. It is regulated. Thereby, the image blur correction apparatus 500 does not need to assemble another member later.
  • a cutout portion 521b is formed on the side wall of the third group frame 520.
  • the movable frame 510 can be assembled to the third group frame 520 from the direction perpendicular to the optical axis X. That is, the image blur correction apparatus 500 does not need to insert a slide shaft later. Therefore, the image blur correction apparatus 500 can more effectively suppress the deterioration of the performance during assembly than before.
  • the image blur correction device 500 has been described with an example in which the movable frame 510 has the protrusion 519 and the fixed frame 530 has the hole 532.
  • the present technology is not limited to this.
  • the image blur correction device 500 may include the fixed frame 530 having a protrusion extending in the optical axis direction, and the movable frame 510 having a hole into which the protrusion is inserted. Even in this case, the movement of the movable frame 510 can be restricted within a predetermined range by inserting the protrusion into the hole.
  • the image blur correction apparatus 500 of the present embodiment has been described with an example in which the movable frame 510 is indirectly held by the fixed frame 530 via the third group frame 520.
  • the present technology is not limited to this.
  • the image blur correction apparatus 500 may have a configuration in which a slide shaft or the like is fixed to the fixed frame 530 and the fixed frame 530 directly holds the movable frame 510.
  • the image blur correction device 500, the third group frame 520, and the fixed frame 530 may be integrally formed.
  • FIG. 4 is an exploded perspective view of the shutter device 400 of the present embodiment.
  • the shutter device 400 includes a flexible printed circuit board 410, a main body frame 420, a shutter actuator 430, an ND actuator 440, a blade 450 and a blade fixing frame 460.
  • the flexible printed circuit board 410 is electrically connected to the shutter actuator 430 and the ND actuator 440. Further, the flexible printed circuit board 410 is electrically connected to the terminals of the flexible printed circuit board 10 of the lens barrel 1.
  • the main body frame 420 is attached to the image sensor 800 side of the first group frame 100.
  • the main body frame 420 has a frame shape and holds the shutter actuator 430 and the ND actuator 440 therein.
  • the main body frame 420 holds the blades 450 on the image sensor 800 side.
  • a blade fixing frame 460 is attached to the main body frame 420 so as to sandwich the blades 450 therebetween.
  • the shutter actuator 430 controls the opening / closing of the opening 451 of the blade 450.
  • the ND actuator 440 inserts and removes a filter (not shown) that limits the light transmittance into the opening 451 of the blade 450.
  • the ND actuator 440 and the shutter actuator 430 of the present embodiment are electromagnetic actuators.
  • the shutter actuator 430 includes a yoke 431, a coil 432, and a magnet 433 (see FIG. 6A).
  • the ND actuator 440 also has a yoke, a coil, and a magnet (not shown).
  • the blade 450 has an opening 451, and the opening / closing of the opening 451 is controlled by the shutter actuator 430.
  • the blade fixing frame 460 fixes the blade 450 to the main body frame 420 by being attached to the main body frame 420 with the blade 450 interposed therebetween.
  • the image blur correction apparatus 500 includes an electromagnetic actuator that includes a magnet 513 and a coil 523 or a magnet 515 and a coil 525.
  • the shutter device 400 also includes a shutter actuator 430 and an ND actuator 440 that are electromagnetic actuators. For this reason, if the shutter device 400 and the image blur correction device 500 are arranged close to each other, the other actuator is affected by the leakage magnetic flux generated by one actuator, and the operation of each actuator may be abnormal. There is.
  • the leakage magnetic flux when the coil 432 of the shutter actuator 430 is energized affects the Hall element 524 of the image blur correction device 500. Thereby, the accuracy of detecting the position of the movable frame 510 by the Hall element 524 may be deteriorated.
  • the magnetic flux of the magnet 515 in the image blur correction apparatus 500 affects the shutter actuator 430. As a result, the operation of the shutter actuator 430 may be reduced. Alternatively, it has been found that an attractive force is generated between the magnet 515 in the image blur correction apparatus 500 and the yoke 431 or the magnet 433 of the shutter actuator 430.
  • FIG. 5 is a top view of the shield plate 514 of the present embodiment.
  • the shield plate 514 has a main body portion 514a, a protruding portion 514b, and a protruding portion 514c.
  • the main body 514 a has a substantially rectangular shape similar to the magnet 515 and is bonded to a position facing the magnet 515.
  • the protruding portion 514b protrudes from the main body portion 514a to the shutter actuator 430 side in a plane perpendicular to the optical axis.
  • the protrusion part 514b has the magnetic flux absorption part 514ba and the connection part 514bb, as shown in FIG.
  • the magnetic flux absorber 514ba is disposed at a position facing the shutter actuator 430, and absorbs magnetic flux generated from the second magnetic pole 430b (see FIG. 7C) of the shutter actuator 430.
  • the connection part 514bb connects the main body part 514a and the magnetic flux absorption part 514ba, and has a smaller area than the main body part 514a and the magnetic flux absorption part 514ba.
  • FIGS. 6A to 6C are views showing the positional relationship between the shutter actuator 430 and the shield plate 512 of the present embodiment.
  • FIG. 6A is a top view.
  • FIG. 6B is a front view.
  • FIG. 6C is a bottom view.
  • the shutter actuator 430 includes a horseshoe-shaped yoke 431, a coil 432 wound around the yoke 431, and a substantially cylindrical magnet 433.
  • the ND actuator 440 also has the same configuration as the shutter actuator 430.
  • the shield plate 514 has a projecting portion 514b that intentionally projects from the main body 514a, in addition to the main body 514a facing the magnet 515.
  • the protruding portion 514b is provided at a position facing the shutter actuator 430.
  • the main body portion 514a is provided at a position where a magnetic force line generated from one of the first magnetic poles 430a passes among the magnetic force lines generated from the shutter actuator 430.
  • the protrusion 514 b is provided at a position where a magnetic force line generated from the other second magnetic pole 430 b passes among magnetic force lines generated from the shutter actuator 430.
  • the image blur correction device 500 includes the Hall element 524 that detects the position of the movable frame 510, the magnet 515 that drives the movable frame 510, and the coil 525.
  • the magnet 515 is disposed between the shutter actuator 430 and the hall element 524 so as to face the hall element 524. Furthermore, the image blur correction apparatus 500 includes a shield plate 514 that shields the magnetism of the magnet 515 and the shutter actuator 430. The shield plate 514 is provided between the shutter actuator 430 and the magnet 515. The shield plate 514 absorbs magnetic flux generated from the magnet 515. In particular, the main body 514 a of the shield plate 514 plays a role of reducing leakage magnetic flux generated on the shutter actuator 430 side of the magnet 515.
  • the main body 514a reduces the magnetic flux leakage generated from the magnet 515 to the shutter actuator 430 side. Accordingly, the main body 514a can suppress the magnetic flux of the magnet 515 from lowering the operation of the shutter actuator 430 due to the magnetic flux of the magnet 515 turning around the shutter actuator 430.
  • the main body portion 514a can suppress the occurrence of attractive force between the magnet 515 and the yoke 431.
  • the main body portion 514a can suppress the occurrence of attractive force between the magnet 515 and the magnet 433.
  • the main body 514a also plays a role of reducing the magnetic resistance around the magnet 515. Therefore, even if the magnet 515 is thinned, a magnetic flux equivalent to that obtained when the main body 514a is not provided can be obtained.
  • the material cost of permanent magnets has increased due to the rising prices of rare earth metals such as Nd (neodymium) and Dy (dysprosium). For this reason, it becomes possible to make the magnet 515 thin by providing the main-body part 514a. As a result, the amount of magnet material used for the magnet 515 is reduced, and the material cost is reduced.
  • the main body 514a is not sufficient as a countermeasure against the leakage magnetic flux of the shutter device 400 affecting the image blur correction device 500.
  • FIG. 7A to FIG. 7C are diagrams showing the operational relationship between the shutter actuator 430 and the shield plate 514 of the present embodiment.
  • 7A shows a case where the shield plate 514 is not provided
  • FIG. 7B shows a case where the shield plate 514 has no protrusion 514b
  • FIG. 7C shows a case where the shield plate 514 has a protrusion 514b.
  • Magnetic field lines are shown.
  • FIG. 7C is a cross-sectional view taken along the line XX of FIG.
  • FIGS. 7A to 7C indicate the lines of magnetic force generated from the shutter actuator 430.
  • the magnetic flux generated from the shutter actuator 430 is generated from one side (first magnetic pole 430a) of the horseshoe-shaped yoke 431 and the other side (second magnetic pole). Return to 430b).
  • the inventor calculated the magnetic flux density acting on the Hall element 524 using magnetic field analysis software. The results are shown below.
  • the magnetic flux density acting on the Hall element 524 was 3.10 Gauss.
  • the magnetic flux density acting on the Hall element 524 was 4.59 Gauss.
  • the magnetic flux density acting on the Hall element 524 was 2.43 Gauss. It has been found that the magnetic flux density acting on the Hall element 524 is higher in the case of FIG. 7B than in the case of FIG. That is, it has been found that the leakage magnetic flux acting on the Hall element 524 increases only by simply providing the main body 514 a on the magnet 515 than when the shield plate 514 is not provided.
  • the shield plate 514 is made of a material having a small magnetic resistance. Therefore, when the shield plate 514 is disposed in the vicinity of one side of the shutter actuator 430, the shield plate 514 short-circuits the magnetic path or collects surrounding magnetic flux. Thereby, it is considered that the leakage magnetic flux acting on the Hall element 524 increases.
  • the magnetic flux density acting on the Hall element 524 becomes small.
  • the protruding portion 514b of the shield plate 514 extends not only near one side (first magnetic pole 430a) of the shutter actuator 430 but also to the other side (second magnetic pole 430b). Therefore, the magnetic lines of force that have come out from one side (first magnetic pole 430a) of the shutter actuator 430 enter the protrusion 514b, pass through the main body 514a, and to the other side (second magnetic pole 430b) of the shutter actuator 430. Return. As a result, the leakage magnetic flux acting on the Hall element 524 is considered to be small.
  • a shield plate 514 may be provided so as to cover it.
  • the shield plate 514 has a projecting portion 514b intentionally projecting from the main body portion 514a in addition to the main body portion 514a facing the magnet 515.
  • the main body portion 514a is provided at a position through which the magnetic lines of force generated from the first magnetic pole 430a pass among the magnetic lines of force generated from the shutter actuator 430.
  • the protruding portion 514 b is provided at a position where a magnetic line of force generated from the second magnetic pole 430 b passes among magnetic lines of force generated from the shutter actuator 430.
  • the lens barrel 1 of the present embodiment even when a configuration in which a plurality of actuators are arranged close to each other is adopted, the leakage magnetic flux generated by one actuator is prevented from affecting the other actuator. be able to.
  • the protruding portion 514b has a large area so as to cover the entire shutter actuator 430. In that case, it is considered that the effect of reducing the leakage magnetic flux acting on the Hall element 524 becomes higher.
  • the protrusion 514b is too large, the mass of the movable frame 510 including the shield plate 514 will increase. As a result, it is conceivable that the performance of the image blur correction apparatus 500 deteriorates. Further, the size of the shield plate 514 is increased. For this reason, it is considered that the size of the lens barrel 1 is increased.
  • the inventor of the present technology provides the protrusion 514b at a position where the magnetic field lines passing through the main body part 514a side and the magnetic field lines on the opposite side pass through even if the protrusion part 514b has a small area with respect to the main body part 514a. It was found that a sufficient effect can be obtained. Note that the shape and size of the protruding portion 514b are preferably determined in consideration of the effect of reducing the leakage magnetic flux.
  • a magnet 513, a magnet 515, a shield plate 512, and a shield plate 514 are provided on the movable frame 510 side, and a hall element 522, a hall element 524, a coil 523, and a coil 525 are provided on the third group frame 520 side.
  • a so-called movable magnet type configuration has been described as an example.
  • the present technology is not limited to this.
  • a so-called coil movable type configuration that is a counter electrode to the magnet movable type may be employed. That is, Hall element 522, Hall element 524, coil 523, and coil 525 may be provided on movable frame 510, and magnet 513, magnet 515, shield plate 512, and shield plate 514 may be provided on third group frame 520.
  • the shield plate 514 includes the main body portion 514a facing the magnet 515 and the protruding portion 514b protruding from the main body portion 514a.
  • the main body 514a is provided at a position where a magnetic force line generated from the first magnetic pole 430a passes among magnetic lines generated from the shutter actuator 430 by driving the shutter actuator 430.
  • the protrusion 514 b is provided at a position where the magnetic lines of force generated from the second magnetic pole 430 b pass among the magnetic lines of force generated from the shutter actuator 430.
  • the configuration around the shutter actuator 430 has been described.
  • the same configuration can be applied to the configuration around the ND actuator 440.
  • this configuration can be applied between the lens driving actuator and the image blur correction mechanism.
  • FIGS. 8A to 8E are views showing the shape of the shielding member 830 of the present embodiment, and are a top view, a side view, a front view, an AA sectional view, and a BB sectional view, respectively. It is. 9A and 9B are enlarged cross-sectional views of the lens barrel 1 showing the configuration around the shielding member 830 of the present embodiment, and are a cross-sectional view and a side view as seen from the front, respectively. The cross-sectional view seen from is shown.
  • the shielding member 830 has an opening 831 that opens at a position facing the image sensor 800.
  • the shielding member 830 has a vertex portion 832 with four corner portions projecting outward in the outer peripheral portion, and a side portion 833 corresponding to four sides of the quadrangular shape.
  • the shielding member 830 has an outer shape that is substantially trapezoidal in a side view.
  • the apex portion 832 is formed in a curved shape having no edge. That is, the outer peripheral shape of the shielding member 830 has a shape in which four corners of a quadrangular shape project in the outer peripheral direction and are connected by a smooth curve. Further, the shielding member 830 has a pressing surface 834 pressed against the fixed frame 530 and an outer peripheral portion 835 fixed to the sheet metal 810.
  • the angle of the outer peripheral portion 835 with respect to the pressing surface 834 is different between the apex portion 832 and the side portion 833. Specifically, when the angle of the outer peripheral portion 835 relative to the pressing surface 834 in the side portion 833 is ⁇ , and the angle of the outer peripheral portion 835 relative to the pressing surface 834 in the apex portion 832 is ⁇ , ⁇ and ⁇ have the following relationship: It is designed to satisfy equation (1).
  • the shape of the shielding member 830 is such that a rectangular flat plate-like member is bent at a predetermined angle from four sides with a predetermined height so that the four corners are not wrinkled. It is like a cut shape.
  • the imaging element 800 is fixed to the sheet metal 810, and is fixed so that the shielding member 830 is sandwiched between the sheet metal 810 and the fixed frame 530. ing.
  • the shielding member 830 shields the gap between the lens 531 and the sheet metal 810 held by the fixed frame 530. More specifically, the shielding member 830 shields the gap between the image sensor 800 and the fixed frame 530 by pressing the pressing surface 834 against the lens 531.
  • the imaging element 800 is intentionally fixed with being slightly inclined with respect to the optical axis X in the manufacturing process. This is because, by adjusting the inclination of the image sensor 800 in a uniform manner, it is possible to absorb errors and the like of each lens group and exhibit the maximum resolution performance.
  • the gap between the sheet metal 810 and the fixed frame 530 and the gap between the sheet metal 810 and the lens 531 vary depending on the inclination of the image sensor 800.
  • the shielding member 830 responds to the change in the size of the gap. It needs to be deformed. Since the shielding member 830 of the present embodiment has the shape as described above, expansion and contraction of the shielding member 830 itself is suppressed. For this reason, it can follow a crevice only by changing. Thereby, the adhesiveness with the sheet metal 810 and the fixed frame 530 becomes high, and entry of foreign matters such as dust and dust can be effectively suppressed.
  • the outer peripheral shape of the shielding member 830 will be described in comparison with a simple rectangular case.
  • the shielding member is a simple rectangle, when the gap between the sheet metal 810 and the fixed frame 530 becomes small, twisting and bending occur unless the shielding members around the four corners expand and contract. That is, the shielding member 830 is wrinkled.
  • the outer peripheral shape of the shielding member 830 cannot exhibit a sufficient effect simply by making the four corners of the quadrangular shape project in the outer peripheral direction and connect them with a smooth curve.
  • the shielding member 830 is wrinkled as in the case of a simple rectangle. .
  • the shielding member 830 needs to be designed so that the angle of the outer peripheral portion 835 with respect to the pressing surface 834 satisfies the following relational expression (1).
  • the gap between the sheet metal 810 and the fixed frame 530 is reduced by projecting the four corners of the quadrangle in the outer peripheral direction and connecting them with a smooth curve as in this embodiment.
  • the shielding member 830 can extend along the gap only by being deformed without substantially expanding and contracting. As a result, the shielding member 830 is less likely to wrinkle, the adhesion between the sheet metal 810 and the fixed frame 530 is increased, and entry of foreign matter such as dust and dirt can be effectively suppressed.
  • a material that can easily expand and contract such as rubber, may not be used as the material of the shielding member 830.
  • a material that is difficult to expand and contract but is easily deformed may be used.
  • a member obtained by molding a resin thin plate, a metal thin plate, or the like by pressing or the like can be used. Since these are thinner than rubber and can be easily molded, they can shield a narrower gap.
  • resin thin plates, metal thin plates, and the like are easy to add functions such as conductivity and antireflection. For this reason, these can be combined not only with shielding but also with other functions such as static electricity removal and unnecessary ray cutting.
  • An image blur correction apparatus 500 includes a lens 511 (an example of a first lens), a movable frame 510 that is movable in a plane perpendicular to the optical axis, and a lens 531 (an example of a second lens). ) And a fixed frame 530 that holds the movable frame 510 directly or indirectly.
  • the movable frame 510 has a protrusion 519 extending in the optical axis direction.
  • the fixed frame 530 has a hole 532 into which the protrusion 519 is inserted.
  • the protrusion 519 is inserted into the hole 532, so that the movement of the movable frame 510 is restricted within a predetermined range. According to this configuration 1, it is possible to provide the image blur correction device 500 in which the relative positional accuracy between the lenses is improved.
  • An image blur correction apparatus 500 includes a movable frame that has a first lens and is movable in a plane perpendicular to the optical axis, and a second lens that directly moves the movable frame. Or a fixed frame for holding indirectly.
  • the fixed frame has a protrusion extending in the optical axis direction.
  • the movable frame has a hole into which the protrusion is inserted.
  • the movement of the movable frame is restricted within a predetermined range by inserting the protrusion into the hole.
  • this configuration 2 similarly to the above-described configuration 1, it is possible to provide the image blur correction device 500 in which the relative positional accuracy between the lenses is improved.
  • the lens barrel 1 includes the image blur correction device 500 described in the first or second configuration.
  • the technology disclosed herein can be applied to a device having a camera function, such as a camera, a mobile phone with a camera, a portable terminal with a camera, and the like.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

Le dispositif de correction de flou d'image (500) d'après la présente invention comprend : une armature mobile (510) qui est pourvue d'une première lentille et qui peut se déplacer dans un plan perpendiculaire à l'axe optique ; et une armature fixe (530) qui est pourvue d'une seconde lentille et qui maintient directement ou indirectement l'armature mobile (510). L'armature mobile (510) comporte une saillie (519) qui s'étend dans la direction de l'axe optique. L'armature fixe (530) comporte un trou (532) dans lequel la saillie (519) est insérée. Le mouvement de l'armature mobile (510) est régulé sur une plage prédéfinie à l'aide de la saillie (519) insérée dans le trou (532).
PCT/JP2012/007211 2011-11-11 2012-11-09 Dispositif de correction de flou d'image et tube d'objectif WO2013069302A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011247170A JP2015018001A (ja) 2011-11-11 2011-11-11 像ぶれ補正装置およびレンズ鏡筒
JP2011-247170 2011-11-11

Publications (1)

Publication Number Publication Date
WO2013069302A1 true WO2013069302A1 (fr) 2013-05-16

Family

ID=48289532

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/007211 WO2013069302A1 (fr) 2011-11-11 2012-11-09 Dispositif de correction de flou d'image et tube d'objectif

Country Status (2)

Country Link
JP (1) JP2015018001A (fr)
WO (1) WO2013069302A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017003934A (ja) * 2015-06-16 2017-01-05 リコーイメージング株式会社 駆動装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000330154A (ja) * 1999-05-19 2000-11-30 Canon Inc 像振れ補正装置
JP2005352125A (ja) * 2004-06-10 2005-12-22 Nikon Corp ブレ補正装置
JP2008191267A (ja) * 2007-02-01 2008-08-21 Sony Corp 像ぶれ補正装置、レンズ鏡筒及び撮像装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000330154A (ja) * 1999-05-19 2000-11-30 Canon Inc 像振れ補正装置
JP2005352125A (ja) * 2004-06-10 2005-12-22 Nikon Corp ブレ補正装置
JP2008191267A (ja) * 2007-02-01 2008-08-21 Sony Corp 像ぶれ補正装置、レンズ鏡筒及び撮像装置

Also Published As

Publication number Publication date
JP2015018001A (ja) 2015-01-29

Similar Documents

Publication Publication Date Title
JP6037313B2 (ja) レンズ鏡筒
US10048507B2 (en) Imaging apparatus
US8837929B2 (en) Imaging apparatus
US8238736B2 (en) Optical unit with shake correcting function and photographic optical device
JP6960983B2 (ja) 手振れ補正機能付き撮像装置
US9025945B2 (en) Imaging apparatus
CN117270150A (zh) 光学组件驱动机构
JP5421782B2 (ja) レンズ駆動装置
US20180113322A1 (en) Lens drive device, camera module, and camera-equipped device
US20210364786A1 (en) Camera module
US20160050373A1 (en) Image shake correction device and optical apparatus
KR20150007665A (ko) 카메라 모듈
JP3858308B2 (ja) ブレ補正装置、ブレ補正装置を有するレンズ鏡筒及びブレ補正装置を有するカメラ
KR102608087B1 (ko) 렌즈 구동 장치, 카메라 모듈, 및 카메라 탑재 장치
KR20150051628A (ko) 카메라 모듈
US8696223B2 (en) Shutter device for camera
WO2013069304A1 (fr) Élément de protection
US11997793B2 (en) Optical unit
US20220197048A1 (en) Anti-vibration mechanism for camera device, optical system, camera and electronic device
WO2013073190A1 (fr) Barillet de lentille
WO2013069302A1 (fr) Dispositif de correction de flou d'image et tube d'objectif
JP2009109583A (ja) レンズ駆動装置
WO2010084702A1 (fr) Dispositif d'entraînement de lentille
JP2015025826A (ja) レンズ鏡筒
JP6432045B2 (ja) アクチュエータ及びアクチュエータを備えるレンズ鏡筒

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12848154

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12848154

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP