Epson Elp-3500, Service Manual, Page: 47 / 114

EPSON ELP-3500 Service Manual
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A/B Multi-lens
Dispersion of light from the light source lamp through the A/B multi-lens makes
brightness roughly uniform. A UV filter coats the surface of the multi-lens array to
eliminate ultraviolet rays.
PBS (Polarizing Beam Splitter)
Light dispersed through the A/B multi-lens is further dispersed through the PBS to
make the light intensity uniform.
Lens Adjustment Unit
Adjusts the distortion of light applied through the A/B multi-lens, the polarizing beam
splitter, and the CDM (see definition below).
CDM
The CDM is a light filter that looks red in visual light. The CDM (A) filter transmits only
red light and reflects blue and green lights from the light source.
GDM
The GDM is a light filter that looks blue in visual light. The GDM filter transmits only
blue light from the light source. The light input to the GDM is only blue and green light
reflected by the CDM, as described above, and green light is reflected by the GDM
and provided to the G condenser lens.
D/E Condenser Lens
The D/E condenser lens collects the light dispersed by the GDM to prevent reduction
and provide light to the mirror at the next stage.
R/G/B Condenser Lens
Collects the light divided into R, G, and B.
R/G/B Polarization Unit
Controls the color of lights dispersed into red/blue/green by the CDM and GDM. Films
in the colors shown below are placed on each sheet of the polarization unit.
Table 2-8.
NAME COLOR OF FILM
POLARIZATION R GRAY
POLARIZATION G BLUE
POLARIZATION B RED