Epson EMP-8000 - XGA LCD Projector, Service Manual

Page: 56 / 103

EMP-9000/8000
2-30 Revision:A SEIKO EPSON
2.12. Ligh t Gu ide U n it
The light guide unit eliminates ultraviolet rays which are harmful to the light valve and uniforms
the intensity of divided the light from the lamp inner housing before dividing it into 3 light out-
puts (R/G/B). There are lenses and mirrors for dispersing the light a mirror and lens built in the
block. The below photograph show the appearance and the internal block of the light guide
unit (Do not disassemble the light guide unit in the field maintenance).
Figure2-33 Light guide unit
(1). Lens Array Lens Array A/B
Dispersion of the light from the lamp inner housing by the Lens Array lens array A/B
roughly uniform the brightness. The UV filter coated on the surface of the multi-lens array
eliminates ultraviolet rays to reduce the light valve’s deterioration.
The light dispersed through the Lens Array A/B is reuniformed with PBS lens.
(2). CDM
GDM
CDM
Mirror
Condenser lens B
adjusting Screw
Condenser LensB
Condenser Lens R/G
PBS lens Lens Array B UV Filter
Lens Array A
Mirror
Mirror
Mirror
Polarization plate B
Polarizaion plate G
Polarization plate B
adjusting Screw
Polarization plate R
Polarization plate R
adjusting Screw
Polarization plate G
adjusting Screw
PBS adjusting Screw