Patent ID: 7651237
Filing Date: 2010-01-26
Classification: F41G,G02B

Abstract:
1. An optical system comprising: an objective lens for receiving light from a target scene and forming a target image; an eyepiece lens for outputting said target image; an image erecting prism disposed between said objective and eyepiece lenses; a reticle disposed on a reticle surface of said prism; a fiber adapted to collect ambient light and output light toward said reticle, said fiber having an exit end located a predetermined distance away from said reticle surface; a material having a predetermined index of refraction disposed between said exit end of said fiber and said reticle surface for coupling light from said fiber to said prism; and an artificial light source adapted to generate artificial light that is transmitted into said material and reflected or scattered off of said exit end of said fiber towards said reticle.