Multiple Channel Optical System.
DEPARTMENT OF THE NAVY WASHINGTON D C
Pagination or Media Count:
First and second prisms of material substantially transparent to light transmission are positioned in a common diagonally disposed planar interface, preferably comprising an extremely small air space, to form a composite cubic optic element. Visual information from a first channel is directed to the cubic optical element at an angle such that it passes directly through the cubic optical element, including its diagonally disposed planar interface, without reflection. Visual information from a second channel is directed to an adjacent face of the cubic optical element at such an angle relative to the diagonally disposed planar interface as to cause its total internal reflection and consequent redirection along the same axis as the visual information from the first channel, thereby combining the visual information from both channels without undue loss of light energy.