Patent ID: 6590719
Filing Date: 2003-07-08
Classification: B60R,G02B

Abstract:
A vehicular vision system for providing scenic information of an area exteriorly of a vehicle, said vision system comprising:a focusing lens having a receiving end and a focusing end, said receiving end being opposite said focusing end, said focusing lens comprising an outer focusing optic at said receiving end, a middle focusing optic and an inner focusing optic at said focusing end, said middle focusing optic being positioned between said outer and inner focusing optics, each of said outer focusing optic, said middle focusing optic and said inner focusing optic comprising one of polycarbonate and acrylic, said inner focusing optic including a diffractive element on an outer surface of said inner focusing optic toward said middle focusing optic, said outer and middle focusing optics including elliptical aspheric surfaces on an inner surface of each which is toward said inner focusing optic, said inner focusing optic including an aspheric surface on an inner surface opposite of said diffractive element, wherein said inner surface of said outer focusing optic has a radius of curvature of approximately 1.60 mm and is defined by the equation: z=cy21+1-(1+K)&it;c2&it;y2;c=1rxy;where x, y and z are coordinates on said inner surface of said outer focusing optic along an x-axis, a y-axis and a z-axis, respectively, rxy is a radius of curvature to each point on said inner surface of said outer focusing optic corresponding to an x coordinate and a y coordinate, and K is a conic constant of approximately âˆ’0.2723, an outer surface of said outer focusing optic having a radius of curvature of approximately 3.073 mm, said outer surface of said outer focusing optic being opposite said inner surface of said outer focusing optic;a wide angle lens comprising an outer wide angle optic and an inner wide angle optic, said wide angle lens being positioned near said receiving end of said focusing lens, said wide angle lens refracting a virtual image of the area exteriorly of the vehicle toward said receiving end of said focusing lens, each of said outer wide angle optic and said inner wide angle optic comprising at least one of polycarbonate and acrylic; an image capture device which is adapted to receive a focused image refracted through said focusing lens, said virtual image of said wide angle field of view being focused by said focusing lens on said image capture device; and a display system which displays an image in response to an output of said image capture device.