| 摘要 |
PURPOSE:To prevent surely a photographing miss in the close distance, by constituting a camera so that the camera is locked when an object exists nearer the camera than the closest distance. CONSTITUTION:If the object exists nearer the camera than the closest distance, the output of a comparator 3 becomes H as the result of the distance measurement operation, and a flip-flop FF 4 reads this output at a timing T2 and outputs the H level. An FF 6 waits for a switch 5 to turn on after a timing T3 and outputs the L level when it is turned on. Consequently, the output of a NOR circuit 7 becomes L. The output of a NOT circuit 8 becoms L also. Therefore, the output of an AND circuit 9 becomes L, and a TR 10 is not turned on, and a solenoid is not excited. That is, the camera is locked. Thus, the photographing miss in the close distance is prevented surely. |
