| 摘要 |
PURPOSE:To execute a simple distance measurement completion display by connecting the operating signal outputs of plural switching elements connected to a zone focus distance measuring means to a wired OR, and providing a reverse current preventing diode between these outputs. CONSTITUTION:An output from an operating circuit of a distance measuring part is A/D-converted, and provided as operating outputs ST1-ST3 corresponding to three zones. The outputs ST1-ST3 become H successively and selectively from a short distance, and shows that distance of an object to be photographed is a short distance, an intermediate distance or a long distance. The bases of output transistors Tr1-Tr3 are connected to the outputs ST1-ST3, respectively, and the collector of the transistor constitute a wired OR circuit through an LED5 and it is connected to a power source Vcc. With respect to a lens barrel controlling contact electrode C, an output of the transistor Tr2 is separated from other output by a diode Ge and operates independently, and a distance measurement completion display is executed by the LED5, therefore, a zone control can be executed normally. |
