| 摘要 |
PURPOSE:To correct the error of the extent of defocus by adjusting constants in a specific formula. CONSTITUTION:Constants A1-A3 in the formula are set by variable resistances 67-69 and are inputted to a CPU43 through a multiplexer 70 and an A/D converter 71. A controller 72 impresses a reference voltage Vr to variable resistances 67-69 in accordance with the control signal from the CPU43, and a multiplexer 70 is caused to select voltages of slide terminals of variable resistances 67-69 successively, and the selected voltage is converted to a digital signal consisting of a prescribed number of bits by the A/D converter 71. When a switch 60 is turned off and the normal mode is set, the CPU43 reads set voltages A1-A3 and stores them in an internal RAM and uses them for operation of the formula. When the switch 60 is turned on and the A1-A3 adjusting mode is set, set values A1-A3 of variable resistances 67-79 are read and compared with a prescribed value. Thus, the error of distance measurement is corrected. |
