Oki C 9400 - Manual (Page 366)

Digital LED vs Laser Technology
Conventional Lasers LED Technology
Conventional laser printers use
a laser beam, which is moved
across the image drum by a
series of lenses and spinning
mirrors. Oki Data's digital LED technology
uses a fixed array of light emitting
diodes mounted on a flat strip that
doesn't move.
Advantages of digital LED technology
Advantage Due to
Dramatic reduction in the size and
weight of the printer. Elimination of moving parts of the
light source.
Less wear on the mechanism. Fewer moving parts
Greater consistency in dot placement. Fixed LED array
Crisp type resolution Elimination of edge distortion
inherent in moving optics
Higher reliability Significantly fewer parts
The Electrophotographic Process
The electrophotographic technology used in Oki Data digital LED printers is almost identical to
that employed in most toner-based copying machines. In the color printers, there are four image
drums: black, yellow, magenta and cyan, and four corresponding LED arrays.
Step 1: Charging
The first step is depositing a uniform electrical charge over each image drum.
Step 2: Exposure
Next, each drum is exposed to light to create a latent image on its surface. The light source is
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