Patent ID: 7248401
Filing Date: 2007-07-24
Classification: G02B

Abstract:
1. A common-aperture multispectral objective comprising: an environmental window; a first channel having a first predetermined waveband, the first channel being output to a first focal plane; a second channel having a second predetermined waveband, wherein the second channel is optically folded, the second channel being output to a second focal plane; and a flat-plate beamsplitter disposed optically after the environmental window, wherein the flat-plate beamsplitter reflects the first predetermined waveband to the first channel and transmits the second predetermined waveband to the second channel, wherein the first focal plane and the second focal plane lie parallel to one another and wherein the first channel comprising optically in order from the flat-plate beamsplitter a primary lens, two doublets, a meniscus, a biconvex lens, a field corrector and a faceplate.