Patent ID: 11327206

Abstract:
A diffuser provided with plural shapes obtained by translation on an xy plane of at least one of z=g(x, y) and z=−g(x, y), z=g(x, y) being a smooth function within a rectangle having sides of length of s in x direction and sides of length of t in y direction, the origin being the center of the rectangle, wherein on the sides of the rectangle, and wherein z=g(x, y) has a single vertex at (xv,yv)g(x,y)=h1(x)·h2(y),first derivative ofz=h1(x) is continuous in  second derivative of z=h1(x) has a single point of discontinuity in  first derivative of z=h2(y) is continuous in  and second derivative of z=h2(y) has a single point of discontinuity in