Electronic flashing device and electronic still camera

Abstract

Abstract PURPOSE:To change light emission strength and a diaphragm value in response to recorded image quality and to select the optimum depth of a field by freely selecting resistances which regulate currents flowing to plural flashing discharge tubes with various resistance values or to a single discharge tube. CONSTITUTION:When photographing is performed in a conventional mode, a mode changeover switch 32 or 44 is closed to a circuit of high resistance, for example to a side containing the resistance 26A or 40, whereas in a high image quality mode, the mode changeover switch is closed to a current of low resistance that is, to a side containing the resistance 26B or 42. Then, by closing a synchro switch 30, a trigger circuit 28 excites the flashing discharge tube 24 which emits light owing to the electric charge of a main capacitor 22. In this time, the quantity of currents flowing to the circuit of low resistance is larger than the quantity of currents flowing to the circuit of high resistance, and the light emission strength becomes big. Then, a high definition image can be obtained by raising a diaphragm value without changing a shutter speed. Thus, the light emission strength is switched in response to a recording mode and the optimum recording operation is performed.

Inventors

• 👤 Takao Sasakura
• 👤 笹倉　孝男

Bibliographic Details