LASER BEAM HARD COPY PRINTER

摘要

PURPOSE:To use the paper efficiently by reading and printing the picture element signal for the sub-scan direction of the CRT since the time of picture element signal per one picture element becomes shorter as the resolution of CRT becomes higher. CONSTITUTION:When a microprocessor 10 recognizes that the reception of picture element signal is all completed from a vertical synchronizing counter 25, it commands a main controller 13 to start the printing process. A laser scanning start signal is outputted from the controller 13. The output of a dot counter 23 which counts the output of an oscillator 18 generating the pulse of the same length as one picture element of laser in the main scan direction and the output of a raster counter 24 which counts the number of scan in the sub-scan direction of laser give the read address to a picture element memory 15 through an address multiplexer 19. The 8-bit parallel data read from the picture element memory 15 is outputted to a multiplexer 16, and one bit is selected and outputted to video amplifier through a control circuit 7 as a video signal.