US20050140817A1 - Lens barrel unit - Google Patents

Lens barrel unit Download PDF

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Publication number
US20050140817A1
US20050140817A1 US11/012,304 US1230404A US2005140817A1 US 20050140817 A1 US20050140817 A1 US 20050140817A1 US 1230404 A US1230404 A US 1230404A US 2005140817 A1 US2005140817 A1 US 2005140817A1
Authority
US
United States
Prior art keywords
lens barrel
barrel unit
optical system
image
mounting portion
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.)
Abandoned
Application number
US11/012,304
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English (en)
Inventor
Masanori Hasuda
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.)
Nikon Corp
Original Assignee
Nikon 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 Nikon Corp filed Critical Nikon Corp
Assigned to NIKON CORPORATION reassignment NIKON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASUDA, MASANORI
Publication of US20050140817A1 publication Critical patent/US20050140817A1/en
Priority to US12/232,605 priority Critical patent/US8264556B2/en
Abandoned 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
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
    • 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

Definitions

  • the present invention relates to a lens barrel unit that is built into a camera capable of executing blur correction to correct an image blur caused by unsteady hand movement.
  • a camera in which blur correction control is executed to correct image blur caused by unsteady hand movement or the like normally includes a vibration sensor that detects vibration in the camera.
  • the blur correction control is executed by driving a blur correction optical system or an image-capturing element based upon the results of the detection provided by the vibration sensor.
  • Japanese Laid Open Patent Publication No. H 9-160107 discloses a camera with a built-in lens barrel unit, which uses a non-interchangeable lens.
  • two vibration sensors used for the blur correction control are disposed in the grip of the camera, away from the lens barrel unit, so as to provide the camera as a compact unit.
  • the vibration sensor is disposed at a distance from the lens barrel unit, as in the camera described above, the adjustment and inspection of the blur correction mechanism cannot be performed unless the lens barrel unit is already mounted in the camera.
  • a lens barrel unit comprises a photographic optical system; a drive force generating unit that generates a drive force with which the photographic optical system is caused to move; a drive mechanism that moves the photographic optical system with the drive force received from the drive force generating unit; an image-capturing element mounting portion at which an image-capturing element that captures an image obtained through the photographic optical system is mounted; and a vibration detection device that detects vibration and is disposed in an area surrounding the image-capturing element mounting portion within a range in which the lens barrel unit is projected along an optical axis of the photographic optical system.
  • the drive force generating unit generates the drive force so as to cause the photographic optical system to move along the optical axis; and the drive force generating unit and the vibration detection device are disposed at positions facing opposite each other over the image-capturing element mounting portion.
  • the vibration detection device includes two vibration sensors; and the vibration sensors are both disposed in the area surrounding the image-capturing element mounting portion within the range in which the lens barrel unit is projected along the optical axis of the photographic optical system.
  • the two vibration sensors may be mounted on a sensor board constituted of a hard board; and the sensor board may be fixed onto a member constituting the image-capturing element mounting portion as an integrated part thereof.
  • the two vibration sensors may also be mounted on a hard board which is disposed in a plane substantially perpendicular to the optical axis and in the area surrounding the image-capturing element mounting portion within the range in which the lens barrel unit is projected along the optical axis of the photographic optical system.
  • the lens barrel unit according to the first aspect further comprises a terminal unit that achieves an electrical connection with an external device, and at least one of an adjustment operation and an inspection operation related to a blur correction operation is executed based upon detection results provided by the vibration detection device with power supply and control communication achieved via the terminal unit.
  • the lens barrel unit according to the first aspect may further comprise a retract motor that generates a drive force to reduce a length of the lens barrel unit.
  • a lens barrel unit comprises a photographic optical system that includes a blur correction optical system; a vibration detection device that is disposed in an area surrounding an image-capturing element mounting portion at a position which does not project out along a radial direction beyond an outermost perimeter of the lens barrel unit and detects vibration occurring along two directions perpendicular to an optical axis of the photographic optical system; and a blur correction drive unit that drives the blur correction optical system in correspondence to a detection value provided by the vibration detection device.
  • a camera according to a third aspect of the present invention comprises a lens barrel unit according to claim 1 that is built in the camera.
  • FIG. 1 shows a vertical section of an area around the center of the optical axis in a camera having a lens barrel unit achieved in an embodiment of the present invention
  • FIG. 2 shows a horizontal section of the area around the center of the optical axis in the camera shown in FIG. 1 ;
  • FIG. 3 is a perspective of the lens barrel unit, viewed from the side indicated by the arrow A in FIG. 2 ;
  • FIG. 4 shows the lens barrel unit viewed from the side indicated by the arrow B in FIG. 2 ;
  • FIG. 5 shows the lens barrel unit in FIG. 4 without a blur correction board
  • FIG. 6 is a longitudinal sectional view schematically showing the relationship between the blur correction board and the gyro board.
  • FIG. 1 is a vertical section of an area around the center of an optical axis in a camera having a lens barrel unit 2 achieved in the embodiment.
  • FIG. 2 is a horizontal section of the area around the center of the optical axis in the camera shown in FIG. 1 .
  • the camera uses a non-interchangeable lens with the lens barrel unit 2 built therein.
  • a vibration sensor used to detect vibration is mounted between, for instance, a photographic optical system of the interchangeable lens and a mounting portion of the interchangeable lens at a position outside the optical path so as not to block the light flux.
  • the length of the lens barrel is usually reduced and the lens is retracted when, for instance, the power is turned off so as to be handled as a more compact unit. Since the lens frame member moves by a significant extent along the optical axis when the lens retracts, it is difficult to dispose the vibration sensor around the optical path as in a camera with an interchangeable lens, as described above.
  • the positional arrangement of vibration sensors used in the embodiment to detect vibrations of the camera is improved so as to achieve miniaturization of the camera without leading to a cost increase.
  • the camera achieved in the embodiment includes a camera main body 1 , the lens barrel unit 2 , a CCD 3 , a flash light emitting unit 4 , an electronic viewfinder (EVF) 5 , a monitor 6 , a main condenser 7 , a flash light emitter board 8 , a battery 9 , a camera control board 10 , a memory card unit 11 , a blur correction board 12 , a gyro board 13 , a focus motor 14 , a zoom motor 15 , a retract motor 15 b , a CCD mounting member 16 , a photographic optical system L and the like.
  • EMF electronic viewfinder
  • the camera main body 1 is constituted of a cover member which forms the outer casing of the camera.
  • the camera main body 1 is a member that constitutes the base of the entire camera, at which the various units mentioned above are mounted.
  • the lens barrel unit 2 includes the photographic optical system L, the blur correction board 12 , the gyro board 13 , the focus motor 14 , the zoom motor 15 , the retract motor 15 b , the CCD mounting member 16 and the like.
  • the photographic optical system L includes a lens L 1 , a blur correction lens L 2 (blur correction optical system) and the like.
  • a blur correction drive unit 30 As the blur correction lens L 2 is driven by a blur correction drive unit 30 so as to move along a direction perpendicular to an optical axis 0 , it engages in a blur correction operation for correcting an image blur.
  • the lens barrel unit 2 its components and the like are to be explained later.
  • the CCD 3 is an image-capturing element that captures an image formed through the photographic optical system L at its image-capturing surface.
  • the CCD 3 is locked to a CCD mounting portion 16 a (see FIG. 3 ) of the CCD mounting member 16 .
  • the flash light emitting unit 4 is disposed atop the camera main body 1 and includes a flash light emitter (not shown) that emits auxiliary illuminating light during a photographing operation.
  • the flash light emitter which is stored at a storage position when not in use, is either automatically or manually popped up to an operating position as necessary.
  • the electronic view finder (EVF) 5 is a display unit disposed further toward a photographer relative to the flash light emitting unit 4 at the top of the camera. As the photographer looks into an eyepiece portion of the EVF 5 , he is able to observe a subject image obtained via the CCD 3 .
  • the monitor 6 which is disposed on the rear side (the surface facing toward the photographer) of the camera, is a display unit constituted with a liquid crystal display device larger than the EVF 5 .
  • the subject image obtained via the CCD 3 and information such as the details of the settings selected for the camera are displayed.
  • the monitor 6 can be oriented in any direction on a fulcrum set at a hinge portion 6 a thereof.
  • the main condenser 7 is a condenser that stores the energy required to emit light in the flash light emitting unit 4 . As shown in FIG. 2 , with the side of the camera held by the right-hand of the photographer holding the camera sideways referred to as the right-hand side and the opposite side of the camera referred to as the left-hand side, the main condenser 7 is disposed further on the right-hand side relative to the lens barrel unit 2 and further toward the subject relative to the flash light emitter board 8 .
  • the flash light emitter board 8 which is connected with the flash light emitting unit 4 , the main condenser 7 , the camera control board 10 and the like, is a board at which circuits required for flash light emission are formed.
  • the flash light emitter board 8 is disposed at a position which is substantially the same as the position of the main condenser 7 but is further toward the photographer relative to the main condenser 7 .
  • the battery 9 from which power is supplied to the camera, is disposed inside the grip by which the right-hand of the photographer holds the camera.
  • the camera control board 10 is a board at which a circuit that controls the main operations of the camera is formed and is fixed to the CCD mounting member 16 .
  • the memory card unit 11 reads/writes data in a memory card used as a storage medium in which photographic image data are stored and is fixed to the camera control board 10 .
  • the focus motor 14 is a drive force generating unit that generates a drive force with which a focus lens (not shown) inside the photographic optical system L is driven via a drive mechanism constituted with a lens frame (not shown) and the like.
  • the focus motor 14 is disposed above the CCD mounting portion 16 a .
  • the focus lens is caused to move along the optical axis 0 by the drive force imparted by the focus motor 14 .
  • the zoom motor 15 is a drive force generating unit that generates a drive force for adjusting the focal length of the photographic optical system L via a drive mechanism constituted with a zoom gearbox 15 a (see FIG. 3 ), the lens frame (not shown) and the like.
  • a lens which is part of the photographic optical system L and adjusts the focal length is caused to move along the optical axis O by the drive force imparted from the zoom motor 15 .
  • the zoom motor 15 and the zoom gearbox 15 a are disposed on the left-hand side of the CCD mounting portion 16 a.
  • the retract motor 15 b generates a drive force for retracting with which the length of the lens barrel unit 2 is reduced so as to achieve miniaturization of the camera. It is to be noted that the zoom motor 15 may be used as the retract motor 15 b.
  • the focus motor 14 , the zoom motor 15 and the retract motor 15 b are electrically connected with the camera control board 10 through wiring (not shown).
  • lens barrel unit 2 is explained in further detail.
  • FIG. 3 is a perspective of the lens barrel unit 2 , viewed from the side indicated by the arrow A in FIG. 2 .
  • FIG. 4 shows the lens barrel unit 2 , viewed from the side indicated by the arrow B in FIG. 2 .
  • the CCD mounting member 16 includes the CCD mounting portion 16 a , which is an image-capturing element mounting portion, and screw holes at which the blur correction board 12 , the gyro board 13 and the like are fixed, are formed at the CCD mounting member 16 . Excluding its CCD mounting portion 16 a , i.e., excluding the portion around the optical axis 0 , the CCD mounting member 16 adopts a shape that allows it to cover a section of the lens barrel unit 2 .
  • the blur correction board 12 is a hard board at which a drive circuit engaged to drive a VCM (voice coil motor) of the blur correction drive unit 30 and the like are formed.
  • the VCM causes the blur correction lens L 2 to move along a direction perpendicular to the optical axis O.
  • the blur correction board 12 which is disposed in a substantially L shape so as to enclose the lower portion and the right-hand side of the CCD mounting portion 16 a of the CCD mounting member 16 , is locked onto the CCD mounting member 16 with screws 21 disposed at three positions.
  • the blur correction drive unit 30 is electrically connected with the blur correction board 12 via wiring (not shown).
  • a terminal unit 12 a that electrically connects with an external inspection device is provided at the blur correction board 12 .
  • it is connected with the external inspection device through the terminal unit 12 a to achieve power supply and control communication, and as a result, an adjustment operation and an inspection operation related to the blur correction operation can be executed based upon the results of detection provided by gyro sensors 17 and 18 to be detailed later.
  • a terminal unit 12 b is electrically connected with the camera control board 10 via wiring (not shown)
  • FIG. 5 shows the lens barrel unit 2 in FIG. 4 with no blur correction board 12 installed therein.
  • FIG. 6 is a longitudinal sectional view schematically showing the relationship between the blur correction board 12 and the gyro board 13 .
  • the blur correction board 12 and the gyro board 13 are electrically connected with each other through wiring (not shown).
  • the gyro board 13 having the gyro sensors 17 and 18 mounted thereupon is a sensor board constituted with a hard board.
  • the 13 is disposed on the right-hand side relative to the CCD mounting portion 16 a of the CCD mounting member 16 further toward the subject relative to the blur correction board 12 .
  • the gyro board 13 is disposed in a plane substantially perpendicular to the optical axis O around the CCD mounting portion 16 a within a range over which the lens barrel unit 2 is projected along the optical axis O of the photographic optical system L.
  • the gyro board 13 is fixed to the CCD mounting member 16 so as to form an integrated part thereof through screws 20 disposed at three positions.
  • the gyro sensors 17 and 18 are vibration sensors used to detect vibrations of the camera and are mounted at the surface of the gyro board 13 facing toward the subject.
  • the gyro sensors 17 and 18 are the same type of vibration detector and are respectively disposed along the horizontal direction and the vertical direction in FIG. 5 .
  • the gyro sensors 17 and 18 respectively detect vibrations manifesting along the horizontal direction and the vertical direction in FIG. 5 , running perpendicular to each other.
  • the detection values provided by the gyro sensors 17 and 18 are output to the drive circuit formed on the blur correction board 12 .
  • the blur correction drive unit 30 drives the blur correction lens L 2 along the direction perpendicular to the optical axis O in correspondence to the detection values provided by the gyro sensors 17 and 18 and thus, the blur correction operation is executed.
  • the gyro sensors 17 and 18 are disposed around the CCD mounting portion 16 a within the range R over which the lens barrel unit 2 is projected along the optical axis O of the photographic optical system L.
  • This range R matches the outer perimeter of the lens barrel unit 2 .
  • the gyro sensors 17 and 18 can be regarded to be disposed at positions at which they do not project out along the radial direction beyond the outermost perimeter of the lens barrel unit 2 . This positional arrangement allows the lens barrel unit 2 to be provided as a compact and retractable lens barrel unit by effectively utilizing the available space around the CCD 3 .
  • the gyro sensors 17 and 18 are disposed at positions facing opposite the zoom motor 15 over the CCD mounting portion 16 a . Since this positional arrangement creates a significant distance from the gyro motors 17 and 18 to the zoom motor 15 , the vibration occurring when the zoom motor 15 is being driven is not allowed to be transmitted to the gyro sensors 17 and 18 readily.
  • the vibration occurring as the zoom motor 15 is driven would be picked up at the gyro sensors 17 and 18 , which may lead to an erroneous operation in the blur correction control.
  • the gyro sensors 17 and 18 are disposed over a considerable distance from the zoom motor 15 in the embodiment, such erroneous operation can be avoided.
  • the focus motor 14 is disposed at a position closer to the gyro sensors 17 and 18 compared to the zoom motor 15 .
  • the extent of vibration occurring at the focus motor 14 is relatively small compared to the extent of vibration occurring at the zoom motor 15 , the likelihood of an erroneous operation is not high.
  • the adjustment and inspection operations related to the blur correction operation can be executed for the lens barrel unit 2 by itself, instead of on the finished camera product after the assembly process.
  • the focus motor 14 and the zoom motor 15 are both disposed within the range R over which the lens barrel unit 2 is projected along the optical axis O of the photographic optical system L, as are the gyro sensors 17 and 18 .
  • the lens barrel unit 2 can be provided as a more compact unit and thus, miniaturization of the overall camera is achieved.
  • the gyro sensors 17 and 18 are used as a vibration detection device.
  • the present invention is not limited to this example, and it may be adopted in conjunction with another type of angular speed sensors capable of detecting vibrations manifesting along two directions perpendicular to the optical axis O.
  • the present invention is adopted in the lens barrel unit 2 that executes the blur correction operation by moving the blur correction lens L 2 in the embodiment described above.
  • the present invention is not limited to this example and it may be adopted in a lens barrel unit that executes blur correction by moving, for instance, the image-capturing element.
US11/012,304 2003-12-26 2004-12-16 Lens barrel unit Abandoned US20050140817A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/232,605 US8264556B2 (en) 2003-12-26 2008-09-19 Lens barrel unit

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Application Number Priority Date Filing Date Title
JP2003431889A JP4543677B2 (ja) 2003-12-26 2003-12-26 レンズ鏡筒ユニット
JP2003-431889 2003-12-26

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US12/232,605 Continuation US8264556B2 (en) 2003-12-26 2008-09-19 Lens barrel unit

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US20050140817A1 true US20050140817A1 (en) 2005-06-30

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US11/012,304 Abandoned US20050140817A1 (en) 2003-12-26 2004-12-16 Lens barrel unit
US12/232,605 Expired - Fee Related US8264556B2 (en) 2003-12-26 2008-09-19 Lens barrel unit

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JP (1) JP4543677B2 (zh)
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JP2007139816A (ja) * 2005-11-14 2007-06-07 Chinontec Kk 鏡筒装置及び撮像装置
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CN101191755B (zh) * 2006-11-22 2010-09-29 鸿富锦精密工业（深圳）有限公司 调制传递函数值量测板及使用该量测板的测量装置
US8723922B2 (en) * 2008-09-25 2014-05-13 Sony Corporation Single camera device and method for 3D video imaging using a refracting lens
US8807847B2 (en) * 2011-02-09 2014-08-19 Panasonic Corporation Lens barrel and imaging device
WO2012107966A1 (ja) 2011-02-09 2012-08-16 パナソニック株式会社 レンズ鏡筒および撮像装置
JP6004223B2 (ja) 2011-08-01 2016-10-05 パナソニックＩｐマネジメント株式会社 レンズ鏡筒および撮像装置
JP2013050702A (ja) * 2011-08-03 2013-03-14 Panasonic Corp レンズ鏡筒および撮像装置
JP2013080202A (ja) 2011-09-22 2013-05-02 Panasonic Corp レンズ鏡筒および撮像装置
JP5945781B2 (ja) 2011-10-25 2016-07-05 パナソニックＩｐマネジメント株式会社 レンズ鏡筒
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Also Published As

Publication number Publication date
US20090033751A1 (en) 2009-02-05
US8264556B2 (en) 2012-09-11
JP4543677B2 (ja) 2010-09-15
CN100549747C (zh) 2009-10-14
JP2005189573A (ja) 2005-07-14
CN1637454A (zh) 2005-07-13

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