User`s manual

3. Design and functions
Barco - OverView D series - Doc-3353-2 - user's manual - Revision 05 - Aug 2005
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3-5
3.4 Principle of dual lamp system
The dual lamp system implemented in OverView D is based on a lamp lift which moves the respective lamp in
front of the stationary optics.
The lamps are moveable
The optics is stationary
The following identies apply:
Lamp Top == L1
Lamp Bottom == L2
The lift is the carrier of the lamps and can have two positions: lift up and lift down.
If the lift is in the down position,
the top lamp (Lamp1, L1, Lamp Top) is coupling light into the optical system (P)
If the lift is in the up position,
the bottom lamp (Lamp2, L2, Lamp Bottom) is coupling light into the optical system (P)
L1
L2
P
L1
L2
P
Liftposition
down
up
Figure 3-3
Lift positions
Since there are two lamps, the dual lamp system can have four states:
L1 on, L2 on,
L1 on, L2 off,
L1 off, L2 on,
L1 off, L2 off
L1
L2
L1
L2
L1
L2
L1
L2
Figure 3-4
Lamp states