Beam light scanning apparatus, image forming apparatus, and method for controlling generation of beam light

摘要

A beam light scanning apparatus capable of always stably maintaining the operations of writing and reading data of each line in a normal state while suppressing an increase of the parts cost. The beam light scanning apparatus includes a laser for emitting a beam light for scan. The apparatus further includes a memory allowing writing and reading of data based on image information per pixel read from a target image, units for writing, into the memory, the data of the target image in each line in a direction of main scan in response to a line sync signal, and units for reading the data out of the memory during the same processing cycle corresponding to the line sync signal after a delay of a predetermined time from writing of the data. A control unit converts the read data to a PWM modulated signal in accordance with the data and applies the PWM modulated signal as a driving signal to the laser.