Image forming apparatus capable of changing dotting density

摘要

An image forming apparatus includes a laser beam scanning unit for scanning a recording medium in synchronism with a writing clock signal so that a dotted image is formed on the recording medium, a counter for carrying out a count operation in synchronism with the writing clock signal so that one count value or a plurality of count values determining a scanning area is/are obtained, a first controller for activating or inactivating the laser beam scanning unit based on one or the plurality of count values, a dip switch unit for specifying a dotting density, a second controller for controlling the frequency of the writing clock signal and/or a speed of scanning; and a changing unit for changing one or the plurality of count values, which should be obtained by the counter, based on the dotting density specified by the dip switch unit, so that the position of the scanning area with respect to the recording medium is constant even if the frequency of the writing clock signal and/or the scanning speed are changed by the second controller.