JPS57124339A - Automatic exposure controller for x-ray - Google Patents

Abstract

PURPOSE:To keep the density of photographic film uniform, even for a pickup at the upper limit of pickup condition, by providing a means for setting a pickup condition even with the upper limit of pickup condition, based on a hold means, a pickup time controlling phototimer, and pickup optimum density condition hold means. CONSTITUTION:An output of an image intensifier tube is received at a light receiving section 11, and the output is given to a pickup tube voltage setter 31 and a motor 32 through a tomographic tube voltage signal generator 18 and a pickup tube voltage signal generator 30 at normal use of a photo timer 6, a signal of the section 11 enters the photo timer 6, a stop signal is given from a control 12 terminal and the radiation of X-rays is stopped. At the upper limit pickup of pickup condition such as a split pickup at filling of stomach contrast medium, a switch 12 is selected to th tomography side, the tomographic conditions are stored in a memory circuit 19 with a control signal generating circuit 24 to control a terminal 33 for pickup through the operation of a pickup tube voltage upper limit control circuit 20 and a timer 27.