Toshiba DP120F Service Manual page 276

(3) Laser beam conversion
As shown in the figure below, a laser beam generated from the laser diode has a large
beam divergence and cannot be used as the light source for exposing the photosensitive
drum.
Semiconductor
laser element
Therefore, the laser beam should be converted into parallel light by the Collimator lens.
Semiconductor
laser element
DP120F/DP125F Mechanical Description
Surface parallel to
the junction surface
Aperture surface
Aperture surface
Fig. 5-3-10
Collimator lens
Fig. 5-3-11
5-16
Surface perpendicular
to the junction surface
Laser beam
March 2000 © TOSHIBA TEC
05-03-10
05-03-11