Camera power supply circuit

Abstract

Abstract PURPOSE:To prevent useless power consumption even in case of a special photographing method of a sports photograph, etc., by executing the power supply to a photometric circuit at every constant period, when the first stroke of a release is executed for many hours. CONSTITUTION:Power supply controlling circuits 101-103 are constituted of transistors Tr1-Tr3 and resistances R1-R6. A controlling circuit 201 of a camera operation is fed with the electric power from the power supply controlling circuit 101. A circuit 202 controls running of a shutter rear curtain, and a circuit 203 measures the luminance of an object to be photographed. In a process in which an A/D conversion to a photometric output is executed by the first stroke, a counter 14 counts a clock from a clock generator 13. By the output of this counter 14, a power supply to the circuit 203 is executed intermittently at every prescribed period, when the second stroke operation is not executed even when a prescribed time has elapsed after the first stroke operation of a release.

Inventors

• 👤 Akira Akashi
• 👤 明石　彰
• 👤 Ryuichi Kobayashi
• 👤 竜一 小林
• 👤 Masaharu Kawamura
• 👤 正春 川村

Bibliographic Details