The blue light passes without modification. To use the blue light as is, there is the blue wraparound path
[C].
The filter wheel [G] creates the red light from the yellow light.
Red, yellow, green, and blue lights reach the DMD [F].
*Afocal lens, without convergence, transmits light signal to a distant point as a parallel light.
A: Afocal lens
B: Dichroic mirror
C: Blue wraparound path
D: Phosphor wheel
E: Collimator
F: DMD
G: Filter wheel
Optical Engine Component
Optical engine con is comprised of Combiner Module and DMD/Lens Module.
Laser
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