Light filter having a wedge-shaped profile

Details Light filter having a wedge-shaped profile Light filter having a wedge-shaped profile

2007-05-11

2009-08-18

Evans, F. L (Department: 2877)

Optics: measuring and testing

By shade or color

With color transmitting filter

C359S580000, C359S589000

Reexamination Certificate

active

07576860

ABSTRACT:
A light filter includes exactly one partially reflective layer having a top and a bottom and a wedge-shaped profile defining a wedge direction. First and second transparent layers are disposed on the top and bottom, respectively, of the partially reflective layer, each transparent layer including at least two dielectric layers of two different materials, each dielectric layer having a wedge-shaped profile oriented in the wedge direction. A photospectrometer including a light filter with the wedge-shaped profile is also disclosed.

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