Electronic flash device
专利汇可以提供Electronic flash device专利检索，专利查询，专利分析的服务。并且PURPOSE:To decide whether an electronic flash is necessary or not, by measuring the luminance of an object to be photographed, by use of a photodetector, calculating a measuring output and a set shutter speed signal, and displaying a calculated aperture value. CONSTITUTION:When an electric power supply switch (S) 23 is turned on, a DC electric power supply 3 is supplied to a photometric circuit 11 through a diode 2, a capacitor 1 and a constant-voltage circuit 12, and on the other hand, through a DC-DC converter 4, a main capacitor 5 is charged. In this case, a measuring mode switching circuit 13 of the circuit 11 is switched to a photographed object luminance measuring mode by a changeover S22, and light of an object to be photographed is measured by a photodetector 14 and a photoelectric current measuring circuit 15. An output of the circuit 15 is applied to a shutter speed setting circuit 21 to which a shutter speed causing no camera shake is set, is applied to an aperture value range display switching circuit 18 which is calculated and is subjected to an aperture value switching display operation, and a range of an aperture value causing no camera shake is displayed on a display part 19. Accordingly, a user can decide whether an electronic flash is necessary or not, and electric flash light photographing can be excuted by switching the S22.，下面是Electronic flash device专利的具体信息内容。
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