Patent ID: 6646818
Filing Date: 2003-11-11
Classification: G02B

Abstract:
A panoramic imaging lens comprising an annular light incident surface formed in a rotation symmetrical form around a light axis in a substantial convex lens form bulging to enable incident of lateral light; a first reflective surface formed in an annular concave mirror form bulging outwardly that substantially opposes the light incident surface to reflect light inside the lens; a second reflective surface provided at a central part inside the annular light incident surface to reflect the reflected light from the first reflective surface toward an inner part of the annular first reflective surface; and a light outgoing surface positioned at a central part inside the annular first reflective surface and opposing the second reflective surface to transmit the light from the second reflective surface, wherein:lateral incident light is refracted from said annular light incident surface toward the first reflective surface along first light paths, is reflected from said first reflective surface toward said second reflective surface, and is reflected from said second reflective surface through said light outgoing surface as imaging light, and other incident light is refracted from said annular light incident surface toward the first reflective surface and is reflected from said first reflective surface toward said annular light incident surface along second light paths and is reflected by said annular light incident surface toward the first reflective surface along light paths which agree with said first light paths; and wherein a non-reflective surface is provided on said panoramic imaging lens and on said second light paths to suppress reflection of light along said second light paths.