JPS59191020A - Automatic focusing camera - Google Patents

Abstract

PURPOSE:To realize a close-up, and also to prevent an out-of-focus by inhibiting a release operation when a distance to an object to be photographed exceeds a focal range by a photographic lens set to a close-up position. CONSTITUTION:When a usual photographing of a camera is set and an object to be photographed is at the closest focusing point (d), a light is made incident to only a photodetector 108d, only an output D4 of a comparator 114 is at a high level, an output of a gate 132 is at a low level, and even if a switch 103 is turned on by depressing a release button, a gate 135 does not go to a high level, and a release signal B is not outputted. When a close-up photographic state is set and the object is at the closest focusing point (d), the light of a projecting element 105 is reflected, made incident to the photodetector 108d, and only the output D4 is at a high level, the output of the gate 132 is at a high level, and when the switch 103 is turned on, the release signal B is outputted. When the object to be photographed is positioned except the point (d), an output A0 of a gate 127 is at a low level, and even if the switch 103 is turned on by two low inputs of the gate 132, the gate 135 does not output the release signal B.