| 摘要 |
PURPOSE:To enable time exposure photography with simple constitution by controlling a gate to which a shutter closing signal is applied via a time exposure setting switch, etc. CONSTITUTION:Mark T of shutter dial 61 is placed at index 61b to set the time exposure mode, and then time exposure setting switch 63 is closed via projection 61a to close AND gate 37 applied with a low level voltage. Consequently, the data of the shutter second that corresponds to the value of photometry obtained by capacitor 19 is reproduced by counter 41, MAND gates 27-35, etc., and a high- level shutter closing signal outputted from gate 35 never passes through gate 37. Therefore, FF57 is not set and magnet 59 stays excited, so that the shutter will not operate. Pushing the shutter button again a desired time later closes switch 43 agains temporarily to set FF57 with the high-level output of monostable multivibrator 47 passed through AND gate 49, and the shutter is closed, so that the time exposure photograph will be performed with the simple constitution which requires no cam, etc. |
