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    • 6. 发明公开
    • Temperature-compensed electronic flash device
    • Temperaturkompensierter Elektronenblitz
    • EP1162498A1
    • 2001-12-12
    • EP01113388.1
    • 2001-06-01
    • KONICA CORPORATION
    • Nakanishi, HiromiHosaka, Takao
    • G03B7/16G03B15/05H05B41/32
    • H05B41/325G03B7/16G03B15/05G03B2215/0503G03B2219/045
    • A camera with a built-in electronic flash device, includes: a photographing lens; an aperture stop; an electronic flash emitting portion; a light receiving element for receiving light reflected on a photographic object which has been emitted by the flash emitting portion; and an electronic flash circuit for making the flash emitting portion emit light, the flash circuit having an automatic emission control circuit which stops emission of the flash emitting portion when an amount of the reflected light received by the light receiving element reaches a specified value. With respect to the automatic emission control circuit, Amin satisfies the following conditional expression, (A - 1) EV ≤ Amin ≤ (A + 0.5) EV, where Amin represents a minimum exposure value for a recording medium on which a specified photographic object is recorded when the photographic object that is located at a distance falling within a range from a specified shortest distance to a distance determined by both a guide number obtained when the flash emitting portion emits light at full emission and the aperture stop, is photographed, and A represents a theoretical exposure value.
    • 具有内置电子闪光灯装置的相机包括:拍摄镜头; 孔径光阑; 电子闪光发射部分; 光接收元件,用于接收由闪光发射部分发射的在被摄体上反射的光; 以及用于使闪光发射部分发光的电子闪光电路,所述闪光电路具有自动发光控制电路,当由所述光接收元件接收的反射光的量达到规定值时,所述自动发光控制电路停止所述闪光发射部的发射。 对于自动发光控制电路,Amin满足以下条件表达式:(A-1)EV≤AAM≤(A + 0.5)EV,其中,Amin表示指定的摄影对象的记录介质的最小曝光值 当拍摄对象位于距离指定的最短距离到由闪光发射部分全部发光时获得的指导数和由孔径光阑确定的距离之间的距离的拍摄对象被拍摄时,并且A 代表理论曝光值。