Electronic control flash device

Abstract

Abstract PURPOSE: To make it possible to expose the object properly, by setting the light quantity of the flash discharge tube on the basis of information from the object, which is obtained by stand-by illumination, and information from the range finder. CONSTITUTION: When switch 10 is switched to the (a) side, flash discharge tube 1 projects a prescribed light emission quantity to object 5 by stand-by light emission driving circuit 2. Next, the reflection light of object 5 is measured by reflection light quantity measuring circuit 3 and is applied to light emission correction quantity operating circuit 8. Operating circuit 8 operates a light emission correction quantity on a basis of this reflection light and information of the distance to object 5 given from range finder 7 and applies this quantity to light emission quantity adjustment setting circuit 9. Next, setting circuit 9 adjusts and sets the light emission quantity on the basis of input information. Next, when switch 10 is switched to the (b) side, discharge tube 1 flashes with the light emission quantity adjusted and set by the setting circuit, and thus object 5 is exposed properly. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Kunio Kawamura
• 👤 Togo Teramoto

Bibliographic Details