Patent ID: 6282030
Filing Date: 2001-08-28
Classification: G02B

Abstract:
An eyepiece lens assembly for providing over 30 degrees extended field of view and a greater than 30 mm eye relief, the eyepiece lens assembly comprising:a collecting lens positioned on the optical axis for collecting incoming light;a glass spherical cemented doublet on the optical axis after said collecting lens for providing flatness and color correction;a plastic singlet with a first and second surface on said optical axis after said glass spherical cemented doublet, said second surface is aspheric and said second surface allows for substantially simultaneous control of field flatness, astigmatism, and distortion;a glass spherical singlet on said optical axis after said plastic singlet providing final focus and final collimation onto a focal plane, whereby the eyepiece lens assembly provides over 30 degrees extended field of view, a greater than 30 mm eye relief, under 5% distortion, a substantially telecentric focal plane, and weighing under 6 ounces.