Camera using microcomputer

Abstract

Abstract PURPOSE:To obtain a camera which operates at a low voltage, by using a microcomputer which has a stand-by mode and adding a simple sequence control circuit. CONSTITUTION:The microcomputer MPU1 enters an interruption sequence after a release switch SW3 is turned on, and outputs ASA speed information SU; and a DA converter 10 outputs an analog value, which is transmitted to a shutter control circuit 7 through an adding circuit. The control circuit 7 unlock a trailing curtain once a found shutter speed T is obtained. A source voltage Vcc starts dropping when a magnet 8 is powered on at the L-to-H point of time of a switch SW2. At this time, the MPU11 monitors an input terminal R7 and holds a stand-by signal R14 at L to enter stand-by operation. Consequently, no runaway occurs even when the source voltage drops below a normal microcomputer use voltage. Thus, the camera which operates at a low voltage is obtained.

Inventors

• 👤 Takashi Saegusa
• 👤 隆 三枝
• 👤 Osamu Yoneda
• 👤 修 米田

Bibliographic Details