Flash photography device

Abstract

Abstract PURPOSE:To perform proper flash dimming for a main object by dividing the reflected light of flash light into plural areas for photometry and controlling the quantity of flash light on the basis of the maximum value of the integral value of the flash reflected light. CONSTITUTION:A multiple-division photodetecting elements SP which measures light while dividing an object field into plural areas consists of, for example, nine longitudinal and lateral photodetecting elements SPc1-SPc9. Then a shutter button is pressed to turn on a photometric switch by one stage, and a microcomputer reads an open aperture value and film sensitivity. Further, luminance values Bv1-Bv9 obtained by the element SP are inputted to the microcomputer to operate an aperture value and a shutter speed. Then, the shutter button is pressed to the 2nd stage and a release switch is turned on to hop up the mirror. Consequently, object light incident on the element SP is reflected light from a film and the quantity of flash light is controlled on the basis of the integral value of the maximum luminance BvMAX among nine object luminance values. Thus, dimming operation is carried out on the basis of the maximum value, so the flash photography device is simplified.

Inventors

• 👤 Hiroshi Mukai
• 👤 弘 向井
• 👤 Toshio Yamaki
• 👤 敏生 山木
• 👤 Akihiko Fujino
• 👤 明彦 藤野
• 👤 Shuji Izumi
• 👤 泉　修二
• 👤 Masaaki Nakai
• 👤 政昭 中井
• 👤 Nobuyuki Taniguchi
• 👤 信行 谷口

Bibliographic Details