Panasonic FP-D250 User Manual page 67

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5) Laser scanning unit (LSU)

Semiconductor laser 1

Collimating lens

Semiconductor

Collimating lens

• Divergent light from the semiconductor laser (exposure) with light intensity

modulation by a digital image signal is converted into parallel light by a

collimating lens.

• The parallel laser beam falls on a rotary polyhedral mirror which is called a

polygon scanner.

The direction of the reflected light is curved since the optical path is folded

back by mirrors through f-θ lens, and image formation is realized on the drum

surface as several 42.3 micron light spots.

• The light spot scans lowered main scan direction in the figure while the image

is exposed on the drum as it rotates in the arrow direction (sub scan) to form a

latent electrostatic image.

• Part of the polarized laser beams fall on a synchronization sensor so that timing

for image recording start by the laser beams on the drum is synchronized.

Synchronization sensor

Polygon mirror

Sub scan direction

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