Image picture reading device

Abstract

In an image picture reading device having a light source to irradiate an original copy, a series of sensors arranged in a line for detecting densities of small areas of the original copy by light reflected from the original copy, a reading circuit for sequentially outputting signals for the densities for the small areas of the original copy, and a buffer for storing and outputting the density signals sequentially received from the reading circuit, the buffer being reset for the initial state at constant intervals, the image picture reading device includes a setting unit for a resolution 'K' value of the reading device, a buffer control unit for setting a reset pulse cycle for the buffer at a period for which picture density signals are accumulated to the quantity of 'k' corresponding to the 'K' value input by the setting unit, a light source control circuit for controlling the light amount of the light source, and a control unit for setting the light source control circuit so as to control the light amount to 1/k according to the 'K' value set by the setting unit.