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18 Q-650i Series Installation/Operation Manual
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Folded Optics In rear-projection applications where space behind the projector is limited, a mirror may
be used to fold the optical path, as shown in
Figure 3-5. The position of the projector and
mirror must be accurately set.
Figure 3-5. Folded Optics
Other Considerations Other considerations and tips that can help improve your installation:
• Keep the ambient temperature constant and below 35°C (95°F). Keep the projector
away from heating and/or air conditioning vents. Changes in temperature may cause
drifts in the projector circuitry, which may affect performance.
• Keep the projector away from devices that radiate electromagnetic energy such as
motors and transformers. Common sources of these include slide projectors,
speakers, power amplifiers and elevators.
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For best performance, always use “first-surface” mirrors in your
rear-projection installation (as opposed to conventional,
“second-surface” mirrors with the reflective surface behind a
transparent substrate such as glass or acrylic).
First-surface mirrors provide a strict reflection without the “ghosting”
effect seen with a second surface mirror, where a faint secondary
reflection could be observed coming from the front surface of the
glass.
Screen
Mirror
Tip
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