Section 1: Introduction
CP2210 Service Manual
1-3
020-100556-04 Rev. 1 (01-2012)
Figure 1-1 Optical Light Path
Lamp-to-Integrator:
Bright light is generated by the internal lamp (1.4kW, 1.8kW or 2.0kW). Dual front/rear
glass reflectors direct light from the lamp through a UV filter to the integrator where its internal silica rod
distributes the slightly irregular intensity of the light beam equally across a rectangular field, then passes this
light to the first lens in the IOS.
Integrator-to-IOS:
At the entrance of the IOS, light from the integrator passes through the first lens and
vignetting aperture. This aperture controls the
f/
in the corners of the image and directs the light on to the
adjacent fold mirror 1 and folds the remaining light down 45° through the
f/#
aperture. This aperture controls
the f-number of the light in the system and directs the appropriate amount of light into a series of three more
lenses. Light from the lenses then strikes the yellow notch filter at the bottom of the IOS, where the light beam
folds once more, angling 45° up through the final lens and into the entrance of the prism.
ISO-to-Prism and Light Engine Assembly:
Upon entering the Total Internal Reflection (TIR) prism, light is
internally reflected towards the color prism and then onto the Digital Micromirror Devices (DMDs). In this
initial pass of light - when light enters the TIR prism via the IOS - the angle of incidence ensures all light is
reflected and sent to the color splitting prism. Dichroic reflectors in the color splitting prism split incoming
white light into its red, green and blue color components. Each light component then illuminates the
corresponding red, green or blue rectangular DMD panel in the light engine, where thousands of mirrors (for
“pixels”) continuously tilt either ON or OFF in response to incoming source signals. Whether in the ON or
OFF position light striking the mirrors reflects back through the color prism, but at different angles depending
on the position. However, when the mirrors are in the OFF position light is not collected by the projection lens.
Light striking the ON mirrors of any DMD reflects back to the color splitting prism, where all three color
components arriving from each DMD are recombined. The recombined light then returns to the first prism
and—due to its new angle of incidence— is collected by the projection lens and imaged on the screen. Precise
mechanical alignment of the three DMD panels ensures their respective pixels converge with one another and
are continuously superimposed onscreen in sharp full-color images. Dowel pins/holes on the IOS ensure the
light engine assembly (which secures to the IOS) is accurately aligned to both the IOS and lens when installed.
Adjustment of the lens determines final focus, zoom and offsets for the image.
NOTE:
Every pixel of a 2048x1080 input signal maps to its own mirror on the DMDs. If the input signal
resolution is lower, projector software can resize the image to use more pixels. Without resizing, only the
central mirrors defining this smaller area will be ON — the border of remaining mirrors will be OFF.
Lamp
Only service technicians trained specifically by Christie on lamp replacement and lamp
safety may handle the lamp. High-pressure lamp may explode if improperly handled. Always
wear Christie approved protective safety clothing (P/N:598900-095) whenever the internal
lamp door is open or while handling the lamp.
1
Reflector/Lamp
8
Yellow Notch Filter/Lens 2
2
UV Filter
9
Fold Mirror 2
3
Cold Mirror
10
Vignetting Aperture
4
Integrator Rod
11
Lens 5
5
Lens 1
12
Light Engine
6
Fold Mirror 1
13
Lens
7
Contrast Aperture
