JVC 250, Service Manual

Page: 41 / 190

Chapter 4---Optical
4-8 Model 250 Service Manual
Figure 4-5 Upper level view of Optical Path (top view).
Optical Path - Inputs
Arc Lamp high intensity white light
Component RGB Image light from each of the ILA
®
Optical Path - Outputs
Component RGB polarized light to the ILA
®
Output image light to the Projection Lens
Optical Path - Operation
The light travels from the Arc Lamp into the Optical Path (see Figure 4-5). The
light reflects off a cold mirror and passes through a light pipe. From the Light
Pipe, the light passes through a Condensing Lens .The Condensing Lens also acts
as a XY Positioner. The function of the XY Positioner is to aim the light beam
down the optical path and center it on the face of the ILA
®
.
After being positioned by the Condensing Lens, the light then reflects off two
more Cold Mirrors, losing more Infrared light. It passes through another
Condensing Lens and into the Dichroic Beamsplitter Assembly.