JPS561037A - Half-size negative detecting system - Google Patents

Abstract

PURPOSE: To make possible the automatic detection of half-size negatives by detecting the notches on the film of the spacings corresponding to sizes and generating the half-size negative detecting signal.

CONSTITUTION: When the notch 4''' provided to a film according to full size and half size by a notch detector 11, a monostable multivibrator 32 inverts at the fall of this notch signal, causing an FF30 to be set and the pulses from a pulse generator 34 through an AND gate 35 to be counted by a counter 36. This count value is decoded by a decoder 37 and is applied to an FF38 which is set at the lower limit value corresponding to double notches, etc. and an FF39 which is set at the upper limit value corresponding to half size or more and full size or less. An AND gate 41 opens only when the decode value is above the lower limit value or below the upper limit value and causes an FF31 to be set by the output of the monostable multivibrator 40 which inverts at the rise of the notch detecting signal. This set signal becomes the half size detecting signal, thus the half-size film is automatically detected.

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