| 摘要 |
PURPOSE:To simplify the constitution of a circuit, and also to manufacture a titled device at a low cost by constituting said device so that the reference frequency can be switched on the way of sequency, and a dynamic range by a time base in sequence control of a camera, etc. is not so necessary. CONSTITUTION:A sequence control device of a camera, etc. is constituted of a reference frequency oscillating circuit, a sequence controlling circuit which is controlled by this reference frequency and also outputs a frequency switching signal on the way of sequence, and a switching circuit for switching the reference frequency by this frequency switching signal. As for the reference frequency oscillating circuit 7 for controlling the sequence controlling circuit 6, the oscillation frequency is determined by an internal resistance or a constant current source, and a capacitor C31. For instance, when the sequence controlling circuit 6 turns on a transistor Q31, the oscillation period becomes k(C31+C32), but in case of C31>>C32, the oscillation period becomes kC32, and the reference period can be enlarged remarkably. |
