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    • 3. 发明授权
    • Variable-focus optical element and focus detecting device utilizing the
same
    • 可变焦光学元件和利用其的焦点检测装置
    • US4802746A
    • 1989-02-07
    • US832649
    • 1986-02-25
    • Takeshi BabaShigeyuki SudaNoriyuki NoseEigo KawakamiToshiyuki NakajimaNobuo Kushibiki
    • Takeshi BabaShigeyuki SudaNoriyuki NoseEigo KawakamiToshiyuki NakajimaNobuo Kushibiki
    • G02B3/14G02B7/36
    • G02B7/36G02B3/14
    • A variable focus optical element comprises plural elastic members superposed in the axial direction and a deforming member having an aperture to cause the elastic member to protrude therefrom or descend therein thereby deforming the surface of the elastic members, and the modulus of elasticity of an elastic member at the protruding side is selected larger than that of another elastic member adjacent to first-mentioned elastic member at the protruding side. A focus detecting device comprises an imaging optical system having a variable-focus optical element, an image sensor provided at a determined image plane of the imaging optical system or an optically equivalent position, a sharpness detecting device for detecting the sharpness of the image from image signals obtained from the image sensor, and a device for varying the refractive power of the variable-focus optical element, and the focus state of the image on the image sensor is detected by comparing the sharpnesses detected by the sharpness detecting device at plural refractive powers of the variable-focus optical element.
    • 可变焦距光学元件包括沿轴向重叠的多个弹性构件和具有孔的变形构件,以使弹性构件从其突出或下降,从而使弹性构件的表面变形,并且弹性构件的弹性模量 在突出侧的突出侧被选择为大于在突出侧与第一弹性构件相邻的另一个弹性构件的突出侧。 焦点检测装置包括具有可变焦点光学元件的成像光学系统,设置在成像光学系统的确定的图像平面上的图像传感器或光学等效位置,用于从图像中检测图像的清晰度的锐度检测装置 通过将由锐度检测装置检测的锐度与多个折射力进行比较来检测从图像传感器获得的信号和用于改变可变焦点光学元件的折射力的装置和图像在图像传感器上的聚焦状态 的可变焦光学元件。