| 摘要 |
PURPOSE:To prevent traveling without inter-curtain spacings and exposure irregularities by preventing the shutter driving signal corresponding to an information change in luminance or the like of an object from increasing above a reference value, and setting the reference value thereof at the maximum shutter speed that can be mechanically guaranteed. CONSTITUTION:The luminance information of an object is supplied as photocurrent I1 to a shutter driving signal generating circuit 1 by a photodiode Pd, and current I2 is flowed to a circuit 2 by a transistor Tr2. Thence, the shutter driving signal I8 corresponding to each information change is fed from the Tr, T6 of the circuit 2 to a shutter driving circuit 4, by which the speed of the shutter is determined. When the signal I8 rises above the reference value, an amplifier A4 of a detecting circuit 3 outputs a detection signal I9, thereby preventing the value of the signal I8 from increasing above the reference value. At this time, the reference value is set at the maximum shutter speed that can be mechanically guaranteed. Thereby, photographing is accomplished at the maximum shutter speed despite the presence of an error in information setting, and therefore, blind ing or exposure irregularities are prevented. |
