| 摘要 |
PURPOSE:To make the constitution of a control circuit simle by so arranging the same that an overlay lamp is put out when there is no instruction for lighting of the overlay lamp within a constant time after the index mark of a film is detected. CONSTITUTION:An index mark 16 is detected with an index sensor 11 as a result of revolution of a film 9, and this is made into a signal of OLI-N through an index detecting circuit 12 and is fed to a control circuit 15 and a lighting control circuit 14. When the OLI-N goes to the ''0'' in the circuit 14, an FF20 is reset, and a counter 21 begins to count clock signals CKL-P. To put out an overlay lamp 10, an FF23 is not set despite the emission of the OLI-N, and when the 2N output of the counter 21 goes to the ''1'', a lamp DRIVE-P goes to the ''0'' and the lamp 10 goes out. The constitution of the control circuit is made simple by putting out the lamp in this way. |
