Ricoh BR-C1a Basic Service Training page 214

LD Unit Components (VCSEL Technology)
 This machine uses a new technology called VCSEL.
 A VCSEL LD unit has 40 beams in a two-dimensional array.
 VCSEL allows magnification correction and fine adjustment of
image position.
 VCSEL also keeps the strength of the laser beams constant by
optical waveform correction. This correction is important for
reproducing thin diagonal lines.
Slide 214
[A] Photosensor (feedback detection)
[B] Collimating Lens
[C] Mirror
[D] Aperture
[E] Lens (TCL)
[F] Quarter Wave Plate
[G] VCSEL Array
"VCSEL" means Vertical Cavity Surface Emitting Laser.
It operates at 4800 x 4800 dpi.
The VCSEL method has the following merits:
 Low current threshold / Low energy consumption
 High resolution for vertical writing (4800dpi)
 Polygon motor speed reduction (temperature reduction) / noise reduction,
because 40 beams are writing
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BR-C1 Training