| 摘要 |
PURPOSE:To prevent unnecessary photographing, by generating warning while inhibiting shutter operation where no distance metering signal is generated during a specific period after the movement of a photographic lens starts at the shortest distance position. CONSTITUTION:When an automatic focusing detecting circuit AFC generates no AF-END signal, a pump-up switch PSW is closed, so an OR gate OR7 is held at a level L invariably. The output of an AND gate AN/1 is inverted to a level H after a counter CT starts counting by 95.8msec. Through an OR gate OR4, JK-FF FF2, OR gate OR5, JK-FF FF3, a decoder DCD outpus a signal ST5 in the level H. A signal Q8 is inverted to the level H after the counter CT starts counting by 156.5msec, and inputting to an AND gate AN22, then, a light emitting element LED radiates to alarm a photographer to see a failure of automatic focusing photographying or improper flashmatic photographing. |
