Optical Engine - Epson EMP-1825 Service Manual

EMP-1825/EMP-1815/EMP-1810

2.2.2 Optical Engine

The Optical Engine consists of the Lamp Unit, the Light Guide Unit, the POP (Panel-on-
Prism) Unit, and the projection lens.
Component
Name
Lamp Unit An UHE-210W high-intensity discharge lamp is used as the light source.
In addition, a UV filter protects the LCDs from harmful ultraviolet light. After this light is
polarized, it is then split into 3 spectrums (R, G and B).
Multi Lens Alley
Light Guide
Unit
Polarizer (PBS)
Dichroic Mirrors
The heart of the Optical Engine. Consists of the L/V (R/G/B) and the Prism Unit.
POP Unit Light Valve (L/V)
Prism Unit
Projection Sends the integrated light onto the screen. Two adjustment rings are mounted: the Zoom
lens Ring to scale the projected image, and the Focus Ring to focus the lens.
SEIKO EPSON
Figure 2-4. Optical Engine
Function/Other
Diffuses the light from the lamp to provide uniform illumination.
Polarizes the light and remove the U/V component harmful to the
L/V.
Disperse the polarized light into the R/G/B spectrums.
Controls the intensity of the distributed components of the RGB
light.
Integrates the RGB light
2-6
CONFIDENTIAL
POP Assembly
(Prism Unit + L/V(R/G/B))
Revision:C