| 摘要 |
When a data control portion 300 receives a request for changing a density of picture elements from an external data processing apparatus, a printing control portion 200 defers exposure if it is before start of exposure, until a rotating speed of a polygon mirror 34 becomes constant. If exposure is being performed, the printing control portion 200 defers change of the density of picture elements until the exposure is completed. If printing is being performed in response to a printing request received till then, the printing control portion 200 defers change of the density of the picture elements until the printing is completed. In addition, the printing control portion 200 automatically sets an initial density value of picture elements designated by a printing density initialization switch 237, when power supply is turned on.
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