Optical element output for an image intensifier device

Claim 1

An image intensifier device comprising: an input window formed of optical material and having a planar light receiving surface and an opposed planar light transmitting surface; photoemissive means on said light transmitting surface for emitting electrons in response to light received at said photoemissive means; amplifying means positioned adjacent said photoemissive means for amplifying the number of electrons emitted from said photoemissive means; converting means positioned adjacent said amplifying means for converting the energy from said amplified electrons to light to form an image at an output screen thereof; and an output element for outputting the image from said converting means having means for preventing refections of the image between said output element and said planar light transmitting surface of said input window in the form of a flat plano glass element having an input surface positioned adjacent the output screen of said converting means and an output surface in parallel therewith, and a plano-curved lens element having a planar first surface in parallel with said planar light transmitting surface of said input window and being joined to the output surface of said flat plano glass element for receiving the image from said converting means and a curved second surface for transmitting the image therefrom without such reflections.