| 摘要 |
PURPOSE:To permit pixel data to be controlled as logic value and thereby obtain correct density gradation by determining the linkage between black and white data of pixel data and then controlling the laser beam projection time at the head or rear end of a laser beam control clock. CONSTITUTION:Image data received from an external device 1 is synchronized by dot by means of a clock from an oscillation circuit 9, and then is latched by a latching circuit 2. Pixel data which is output from the latching circuit 2 is entered in a shift register 11. A single dot pixel data A is divided into four portions by means of a clock C from an oscillation circuit 10, and when eight dots of data (8 dots by dither processing) are latched, 32 bits of data are output in parallel from the shift register 11 as an address in the ROM 12 to identify the data and output the corrected pixel data B. The corrected pixel data B of pixel data A is output as data short by 1/4 of the hour before and after the pixel data A, if the dot is identified as an independent black dot 1. Then a laser driver 3 is driven to permit a semiconductor laser 4 to emit light. This process is performed sequentially as described in the above action up to the output of the corrected pixel data B. |
