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Is the beam coming out of a typical DLP optical engine before the projection lens after the DMD/prisms meant to be parallel?

Armen Tmsn
Intellectual 900 points

Is the beam coming out of  a typical DLP optical engine before the projection lens after the DMD/prisms meant to be parallel (collimated)? Kind of hard to tell because of unfocused beam and stray lights mixing together.

This is a question a hired freelance optical engineer was asking wanting to know if his custom projection lens can be positioned farther from the DMD/prisms. If the individual beams from the DMD micromirrors are parallel the answer I believe should be yes., they are parallel

  • 0
    TI__Mastermind 43165 points

    The projection will have the same angular distribution of light as the illumination bundle.  So if you have f/3 illumination optics, your projection bundle will also be f/3.

    If you have collimated illuminated your projection will also be collimated.  There are some minor scattering effects, but the the real answer is that the DMD is not a collimator.  It does not take uncollimated  light and collimate it.

    Fizix