Illumination – Light source and modifier – Including selected wavelength modifier
Reexamination Certificate
2008-09-10
2010-10-19
Husar, Stephen F (Department: 2875)
Illumination
Light source and modifier
Including selected wavelength modifier
C362S245000, C359S839000
Reexamination Certificate
active
07815340
ABSTRACT:
Provided is an optical element (dichroic mirror) including a mirror surface transmitting a part of an incident light beam therethrough and reflecting the other part of the incident light beam. A target cutoff wavelength, which indicates a boundary wavelength between a wavelength band of a desired transmission light beam and a wavelength band of a desired reflection light beam, is defined, the mirror surface includes a plurality of slant regions, each of the plurality of slant regions includes a reference position at which a cutoff wavelength reference value, which determines whether a light beam having a reference incidence angle should be transmitted or reflected, indicates the target cutoff wavelength, and in each of the plurality of slant regions, the cutoff wavelength reference value is set to be a shorter or a longer wavelength than the target cutoff wavelength, based on a distance from the reference position.
REFERENCES:
patent: 5758956 (1998-06-01), Bornhorst et al.
patent: 6667095 (2003-12-01), Wheatley et al.
patent: 2001-83636 (2001-03-01), None
Husar Stephen F
Molsenbocker Marvin A.
Mots Law PLLC
Sanyo Electric Co,. Ltd.
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