Patent ID: 7196315
Filing Date: 2007-03-27
Classification: G02B

Abstract:
1. An eccentric optical system having an approximately parallel input light beam, and comprising a prism having a medium with a refractive index of one or more, on which at least four optical operating surfaces are formed at the boundary surface of the medium, wherein assuming the optical operating surfaces are referred to as a first, second, third, fourth, . . . , and n-th (“n” is a natural number) surface along an optical path of the input light, at least one surface of the first through fourth surfaces is a branching surface wherein the optical path is branched into two optical paths for transmitted light and reflected light, and wherein an optical path is formed wherein the primary light beam on the axis of the reflected light reflected by the branching surface intersects with the primary light beam on the axes of at least two light beams passing through the prism.