Electronic flash device

Abstract

Abstract PURPOSE:To make the slave strobe control using TTL and external dimming system possible, by using an input/output terminal of an auxiliary light emission stopping signal, which is generated synchronously with an external light emission stopping signal, as the input terminal of a TTL light emission stopping signal also. CONSTITUTION:In an external dimming system, a switch 45 of each of master and slave strobes selects terminals (b) and (c). When a trigger signal is given to a terminal 47c for a synchronous contact signal from a camera, each strobe emits light, and the light of the master strobe is measured in a means 21 and is integated in a means 20; and when the integral value reaches a prescribed value, a comparator 24 becomes high-level (issues an external light emission stopping signal) to make gates 35, 37 and 38 high-level. Then, a transistor 41 is turned on, and a terminal 47d outputs a low level (auxiliary light emission stopping signal). This signal is received to make gates 34, 37, and 38 high-level, and the flash light emission of the slave strobe is stopped.

Inventors

• 👤 Shingi Hagiuda
• 👤 進義 萩生田
• 👤 Kiwa Iida
• 👤 飯田　喜和
• 👤 Hiroshi Hasegawa
• 👤 洋 長谷川

Bibliographic Details