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    • 4. 发明授权
    • Flash ready condition dependent on focal length
    • 闪光就绪条件取决于焦距
    • US5367355A
    • 1994-11-22
    • US44665
    • 1993-04-09
    • Gregory B. Foust
    • Gregory B. Foust
    • G03B7/16G03B15/05G03B17/18
    • G03B15/05G03B17/18G03B7/16G03B2215/05
    • A photographic camera including a plurality of focal length settings, a chargeable flash device, and a mechanism for indicating an exposure ready condition at a predetermined state of charge, is characterized by means responsive to the focal length setting for adjusting the predetermined state of charge at which the ready condition is indicated. The state of charge is more complete at longer focal lengths to ensure sufficient illumination and is less complete at shorter focal lengths to reduce wait time. According to one feature of the invention, the camera includes contact elements having a plurality of discrete positions, one each representing a different focal length, and the predetermined state of charge is adjusted depending on the position of the contact elements. The flash ready condition may be signaled by a number of different mechanisms including, for example, flash ready lights, the extinguishment of exposure wait lights, and the release of actuation interlocks.
    • 包括多个焦距设置的照相机,可充电闪光装置和用于在预定充电状态下指示曝光准备状态的机构的特征在于响应于焦距设置的装置来调整预定的充电状态 准备条件被指示。 在更长的焦距下,充电状态更加完整,以确保足够的照明,并且在较短的焦距下不太完整,以减少等待时间。 根据本发明的一个特征,相机包括具有多个离散位置的接触元件,每个离散位置各自表示不同的焦距,并且根据接触元件的位置调整预定的充电状态。 闪光就绪状态可以由许多不同的机构发出信号,包括例如闪光就绪灯,曝光等待灯的熄灭以及致动互锁的释放。