Patent ID: 6356396
Filing Date: 2002-03-12
Classification: G02B

Abstract:
An optical system, comprising:a window; an optical corrector comprising a curved piece of a transparent material having a front surface and a back surface, at least one of the front surface and the back surface having a torus shape defined in Cartesian coordinates by the relation Z(x,y)=Zprev(x,y)+Lx(x,y)+Ly(y), whereinZprev(x,y)=cA&rgr;2/[1+(1âˆ’(kA+1)cA2&rgr;2)Â½]+dA&rgr;4+eA&rgr;6+fA&rgr;8+gA&rgr;10, &rgr;2=x2+y2, Ly(y)=C1y2/[1+(1âˆ’(C2+1)C12y2)Â½]+C3y4+C4y6+C5y8+C6y10+C7y12+C8y14, Lx(x,y)=Cxx2/[1+(1âˆ’(kx+1)Cx2x2)Â½]+C13x4+C14x6+C15x8+C16x10+C17x12+C18x14, Cx=C11+C21y+C31y2, andkxC12+C22y +C32y2, andwherein cA, kA, dA, eA, fA, gA, C1-C8, C11-C18, C21-C22, and C31-C32 are constants; anda sensor system comprising a sensor positioned such that the optical corrector is between the window and the sensor.