Specifications

25
Structure of Laser Unit (F
θ
θθ
θ
lens)
θ
θ
A B
A
• The F
θ
lens corrects the dispersion of
linear velocity caused by the angle of
incoming beam.
Exposure center
Fθ
θθ
θ lens
Paper
2220
33_2
Polygon mirror
Explanation
• The travel (distance) on the paper is different between “the light outputted from the exposure
center at the angle
θ
” and “further output light at the angle
θ
” The travel (distance) on the
paper is different between “the light outputted from the exposure center at the angle light at the
angle
θ
and “further output light at the angle
θ
.(As shown in the illustration, length A, B).
• The F
θ
lens changes the angle of diffracted light according to the angle of incoming beam, and
corrects the difference of travel (distance) on the paper.
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