Panasonic WORKIO DP-150, Руководство по обслуживанию, Страница: 35 / 136

Mechanism
2-17
(5) f-
θ
lens
1)The parallel beams reflected by the polygon scanner are gathered on the drum by
f-
θ
lens. This lens is designed to bend the transmitted beams strongly toward the
optic axis around the lens whose scanning angle is large.
(6) Synchronized signal detecting sensor (Pin photo sensor)
1)Detect the laser beams passing every scanning of each face of the polygon scanner
to prevent the image position slippage on the next main-scanning line to the
minimum and to detect the laser beam position in the main-scanning direction on
the drum accurately. The mirror sharing errors and the rotation irregularity are
ensured by writing the image data according to this write timing signals.
f-
θ
lens
Detecting timing
Synchronized signal
detecting sensor
(Pin photo sensor)
Paper feed direction