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    • 12. 发明申请
    • LIGHT AMOUNT ADJUSTING DEVICE, LENS BARREL, AND IMAGE CAPTURING APPARATUS
    • 光量调节装置,镜头条和图像捕获装置
    • US20160259100A1
    • 2016-09-08
    • US15059092
    • 2016-03-02
    • CANON KABUSHIKI KAISHA
    • Takumi Uehara
    • G02B5/20G02B7/00
    • G02B5/205G02B7/006
    • A light amount adjusting device includes ND filters rotating around shafts serving as rotation shafts and moving between in-use positions and retracted positions, arranged on a base plate. The respective ND filters include uniform density portions, gradation portions, and transparent portions. If the ND filters are in the retracted positions, the transparent portions of the respective ND filters overlap in an area facing an aperture to cover the entire aperture with the transparent portions. If the ND filters are in the in-use positions, the gradation portions of the respective ND filters overlap in an area facing the aperture to cover the entire aperture with the gradation portions and the uniform density portions. Moreover, a combined density acquired when the gradation portions overlap in just proportion is substantially the same as an optical density of each of the uniform density portions.
    • 光量调节装置包括:ND滤光器,其围绕作为旋转轴的轴旋转,并且在布置在基板上的使用位置和缩回位置之间移动。 各个ND滤光器包括均匀的浓度部分,渐变部分和透明部分。 如果ND滤光器处于缩回位置,则各个ND滤光片的透明部分在面向孔的区域中与透明部分覆盖整个孔。 如果ND滤光器处于使用中的位置,则各ND滤镜的灰度部分在面对孔径的区域中与层叠部分和均匀密度部分覆盖整个孔的区域重叠。 此外,当渐变部分按比例重叠时获得的组合密度与均匀密度部分的每个的光密度基本相同。
    • 14. 发明授权
    • Lens barrel and image pickup apparatus
    • 镜筒和摄像装置
    • US08928997B2
    • 2015-01-06
    • US14085217
    • 2013-11-20
    • Canon Kabushiki Kaisha
    • Takumi Uehara
    • G02B15/14G02B7/02
    • G02B7/08G03B11/043G03B2205/0092
    • A lens barrel includes a cam ring configured to be rotatably driven, a lens holding cylinder provided on an outer circumference of the cam ring and configured to hold a lens, and a barrier cylinder configured to hold a lens barrier, the barrier cylinder includes a cylinder portion, a first protrusion which extends from the cylinder portion toward an image plane side, and a cam engagement portion which is engaged with a cam groove of the cam ring, the lens holding cylinder includes a cylinder portion and a second protrusion which extends from the cylinder portion toward the image plane side, and the second protrusion of the lens holding cylinder is arranged so as to overlap with the cam engagement portion of the barrier cylinder in a radial direction orthogonal to an optical axis direction.
    • 透镜镜筒包括被构造为可旋转地驱动的凸轮环,设置在凸轮环的外圆周上并构造成保持透镜的透镜保持筒,以及构造成保持透镜屏障的阻挡筒,阻挡气缸包括气缸 从所述圆筒部朝向像面侧延伸的第一突起和与所述凸轮环的凸轮槽接合的凸轮接合部,所述透镜保持筒包括圆筒部和从所述第二突起延伸的第二突起, 圆筒部分朝向像面侧,透镜保持筒的第二突起设置成与阻挡圆筒的凸轮接合部分在与光轴方向正交的径向上重叠。