| 摘要 |
PURPOSE:To prevent the production of a wasteful loss of a battery, by a method wherein a firing a conducted through a simple operation in which a firing button is instantaneously depressed by a one-action oeration, and besides, a firing is automatically confirmed by a photo-transistor. CONSTITUTION:With a firing button 5 depressed, a transistor 9 is brought to an ON-state through a resistance 8 from a point (a). As a result, a heater 6 for firing is energized to start a firing. In which case, a circuit consisting of resistance 10 - a point (e) - a resistance 11 is also energized, whereby a transistor 12 is also brought to an ON-state, and a current flows to a base of transistor 9 from a point (f) of a collector to form a self-holding circuit. Thus, even if the firing button 5 is released from a manual depression, the heater 6 for firing continues to perform a firing operation. However, after fired, the transistor 9 is brought into an releasing state through the working of a photo transistor 15, and as a result, the heater 6 for firing is brought to an OFF-state. When difficult to fire, a voltage is applied to a timer circuit from a point (f). At the start, an operational amplifier 20 has an Hi output (i), but if a capacitor 17 is sufficiently charged, it has a Lo output (i), and similarly, the transistor 9 is brought to an OFF-state, and the heater for firing is brought to an OFF-state. |
