| 摘要 |
PURPOSE:To store film information correctively even if a film is fed backward temporarily on account of a mechanical backlash or the like by storing data correctly in a memory when the information hole of the film comes to a sensor part. CONSTITUTION:When holes 3, 4 for actuating a switch rotate in synchronization with the rotation of a sprocket wheel, the sections 7, 8 constituting the switch drop alternately into the holes 3, 4 and switches S1, S2 are turned on alternately at each dropping. Monostable multivibrators OM1, OM2 apply pulses of a specified time width alternately through an OR gate G3 as the clock pulses for a shift register SR1 for a film information memory at every alternate turning on of the switches S1, S2. More specifically, the respective pitches of the holes 3, 4 are two-fold the perforation holes and are arranged at the intermediate of each perforation hole; therefore, when said holes come exactly to the position where there is an information hole, a clock pulse is generated. The light emitted by a light emitting diode 9 is detected with a photodiode 10 and is applied as the film information to the data input terminal D of the memory. When the clock pulse is fed through the gate G3 to a clock pulse input terminal CK at every position where there is the film information, the pulse is read into the memory at each time and is stored as film information. |
