| 摘要 |
PURPOSE:To realize the control of manual second-time which permits errors of a set signal in both positive and negative directions, by constituting a manual shutter second-time information resistance so that analog signals of prescribed decimal stages are outputted under overlapped conditions. CONSTITUTION:A relation, V=Vr(10-TV)/10+4Vr/80, is set between a fixed voltage Vr impressed upon a shutter second-time information resistance and a voltage V corresponding to a manually set shutter second-time, and bits (Q4-Q6) of integer stages obtained after the voltage V is AD-converted are used for the shutter speed control. Therefore, even when the error of the voltage V is in a stage of -4/8-+3/8 when a manually set shutter second-time is 1/500, the control is accurately performed. When the 2nd term (overlap signal) of right- hand member of the voltage V setting formula does not exist, accurate control is performed for an error in positive direction, but inaccurate control is performed for an error in the negative direction. |
