LASER BEAM PRINTER

摘要

By controlling intensity of laser beam from laser diode thereafter controlling electric potential of pixel part formed at drum, adjusting toner amount transcribed to the drum toner amount formed at paper discriminates the brightness differences and its method provides circuit of controlling image brightness of laser beam printer. Input of synchronized density signal(N) to digital/analog conversion part is converted into analog voltage then it is inputted to laser power controlling part(2) as standard signal, and being compared input standard signal with comparative signal returned from laser diode detecting part(5) that detects intensity of laser diode(4), and by that result it controls laser diode(4).