| 摘要 |
A laser printer records an image on a medium as a function of digital data which is received at an input data rate. A laser beam is used for recording pixels of the image on the medium while the medium is advanced in a longitudinal direction at a controlled uniform rate. The pixels are recorded by scanning the beam across the medium in a transverse direction, at a scan velocity, using a multifaceted, rotating mirror which reflects the beam onto the medium. The scan velocity is proportional to the angular velocity of the rotating mirror. Beam intensity is modulated as a function of the input digital data In order for the average data rate of recording to be compatible with the input data rate while maintaining a high instaneous scan velocity, the beam is scanned across the medium by only one of every N-facets of the rotating mirror.
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