Producing distinguishable light in the presence of ambient...

Details Producing distinguishable light in the presence of ambient... Producing distinguishable light in the presence of ambient...

2008-05-06

2008-05-06

Harrington, Alicia M (Department: 2873)

Optical: systems and elements

Lens

With reflecting element

Reexamination Certificate

active

11429535

ABSTRACT:
A process and apparatus for producing distinguishable light, in the presence of ambient light is disclosed. The process involves admitting light in a first wavelength band through a first light admission port into a first optical cavity at least partially defined by a first reflector operably configured to reflect light out of the first optical cavity. The process also involves filtering ambient light reflected into the first optical cavity and entering and exiting a first space defined about the first light admission port such that ambient light outside the first wavelength band is attenuated on entry and exit from the first space.

REFERENCES:
patent: 2004/0037076 (2004-02-01), Katoh et al.
patent: 2006/0239006 (2006-10-01), Chaves et al.

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