Optics: image projectors – Polarizer or interference filter
Reexamination Certificate
2007-09-04
2007-09-04
Koval, Melissa Jan (Department: 2851)
Optics: image projectors
Polarizer or interference filter
C353S102000
Reexamination Certificate
active
11469282
ABSTRACT:
An illumination optical system which can use light from a light source with high efficiency and can provide an illumination luminous flux with highly uniform illuminance, is disclosed. The illumination optical system illuminates an illumination surface with a generally telecentric illumination luminous flux. In light intensity distribution of illumination light on the illumination surface changing depending on a deviation angle of an incident ray with respect to a normal to the illumination surface, the illumination optical system operates the illumination luminous flux such that a ratio of angle widths at which light intensity reaches half of a peak value in each of two axis directions orthogonal to each other on the illumination surface is an aspect ratio of 2:1.
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Koval Melissa Jan
Morgan & Finnegan , LLP
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