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    • 4. 发明授权
    • Arrangement for controlling an iris to regulate light in an optical
system
    • 用于控制光圈以调节光学系统中的光的布置
    • US5483280A
    • 1996-01-09
    • US320376
    • 1994-10-11
    • Yoshikazu TakahashiToshiaki IsogawaYutaka SatohShuji Shimizu
    • Yoshikazu TakahashiToshiaki IsogawaYutaka SatohShuji Shimizu
    • H04N5/235H04N5/238
    • H04N5/2352H04N5/238
    • A light amount control apparatus including an iris (2) for adjusting an amount of a light from a lens (1) and supplying the adjusted light amount to a CCD element (3), an iris driving unit (9) for driving the iris (2), an iris position detecting unit (10) for detecting an aperture value of the iris (2), a shutter driving unit (8), and a microcomputer (11) for controlling the iris (2) through the shutter driving unit (8) and the iris driving unit (9). The aperture value of the iris (2) can be prevented from being increased after the position of the iris (2) detected by the iris position detecting unit (10) is located a little ahead of the position at which a diffraction phenomenon occurs. After the iris position detecting unit is located a little ahead of the position at which the diffraction phenomenon occurs, the aperture value of the iris (2) can be prevented from being increased. Therefore, when the cameraman takes a picture of bright scene, for example, even if the iris is closed considerably, the diffraction phenomenon can be prevented and a satisfactory shooting can be effected.
    • 一种光量控制装置,包括用于调节来自透镜(1)的光量并将调整后的光量提供给CCD元件(3)的光圈(2),用于驱动光圈的光圈驱动单元(9) 2),用于检测光圈(2)的光圈值的光圈位置检测单元(10),快门驱动单元(8)和用于通过快门驱动单元(2)控制光圈(2)的微计算机(11) 8)和虹膜驱动单元(9)。 在由虹膜位置检测单元(10)检测到的虹膜(2)的位置位于发生衍射现象的位置之前可以防止虹膜(2)的孔径值增加。 在虹膜位置检测单元位于发生衍射现象的位置之前的一点处,可以防止虹膜(2)的孔径值增加。 因此,摄像师拍摄明亮场景时,即使光圈相当闭合,也能够防止衍射现象,能够进行令人满意的拍摄。