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    • 7. 发明授权
    • Automatic exposure control system
    • 自动曝光控制系统
    • US4383749A
    • 1983-05-17
    • US154537
    • 1980-05-30
    • Nobuhiko ShinodaNobuaki Sakurada
    • Nobuhiko ShinodaNobuaki Sakurada
    • G03B7/097G03B7/095
    • G03B7/095
    • The disclosed control system controls the diaphragm aperture of a camera in accordance with a preselected shutter time. A diaphragm scanner produces one pulse for each change of one stop in the size of aperture opening. When the required value of the diaphragm aperture, as determined in Apex form, is a number having an integer and a decimal fraction, the diaphragm aperture is adjusted in accordance with the integer, and the shutter time is adjusted to a value obtained by factoring the decimal fraction into the preset value of shutter time. Corresponding adjustment of the shutter time assures a one-eighth-stop accuracy in exposure control despite the diaphragm aperture being varied in one-stop increments.
    • 所公开的控制系统根据预选的快门时间控制相机的光圈孔径。 光圈扫描器为孔径开口尺寸的一个挡块的每次更换产生一个脉冲。 当以Apex形式确定的光阑孔径的所需值是具有整数和小数的数字时,根据整数调整光阑孔径,并且将快门时间调整为通过将 小数段进入快门时间的预设值。 相应的快门时间调节确保了曝光控制的八分之一秒精度,尽管光阑孔径以一步增量变化。