| 摘要 |
PURPOSE:To improve the application flexibility of an aperture control circuit and further that of a camera control circuit, and to simplify the constitution of aperture driver, etc., by compensating the time lag of the stopping of the aperture driver through the aperture control circuit. CONSTITUTION:A digital signal from an aperture-value memory circuit is inputted to the aperture-value decoder FDEC of an aperture control circuit COM1, and a pulse-number signal indicating a desired aperture value is inputted form the aperture-value decoder FDEC to one input terminal of a digital comparator DC. The output pulse-number signal of an aperture pulse counter FSC is inputted to the other input terminal of the digital comparator DC and when both the pulse number signals are coincident with each other, an SR flip-flop FF is set to output a stop signal beta to an aperture driver. In this case, a pulse-number signal corrected by the number of pulse equivalent to the time lag from the reception of the stop signal by the aperture driver until the stopping of the driver is outputted from the aperture value decoder FDEC. |
