Electronic image pickup device

Abstract

Abstract PURPOSE:To attain more proper strobo pickup by reading an output signal resulting from exposure at pre-lighting with a gain higher than a gain at main exposure so as to attain photometry with high precision thereby expanding a photometry available range more. CONSTITUTION:When a strobo pickup is commanded, a comparatively high gain GP for pre-lighting photometry is set to a gain of a gain control amplifier 6. Then a shutter of an imager 3 is opened and pre-lighting of strobo is implemented. Then the shutter is closed, and a value corresponding to an exposure luminous quantity by pre-lighting is given to an integration circuit 8 and an A/D converter circuit 9 or the like, in which the value is obtained as an integration value IP and it is read to a system controller 4. Then a gain of the gain controller 6 is set to a gain GN at main exposure. Then a main lighting luminous quantity M for main exposure is calculated from the integration value IP, a value IA corresponding to an object luminous quantity at strobo pickup, the imager exposure luminous quantity and the above mentioned integration value, a pre-lighting luminous quantity P and the gains GP, GN. Then the shutter for main exposure is opened, a strobo lighting device 12 executes main lighting with the luminous quantity M to implement the image pickup.

Inventors

• 👤 Hideaki Yoshida
• 👤 英明 吉田

Bibliographic Details