Patent ID: 6297916
Filing Date: 2001-10-02
Classification: G02B

Abstract:
An imaging lens, for use with interferometric device comprising, in successive order from the most object side of the imaging lens:a first lens component;a second lens component; anda third lens component;whereinthe first lens component is formed of a single lens element or multiple lens elements, said first lens component having a meniscus shape as a whole with a concave surface on the object side;one lens component, of among the second lens component and the third lens component, has positive refractive power and the other lens component thereof has negative refractive power, andthe following conditions are satisfied-0.1<f/f.sub.1 <0.60.3<d.sub.F /d<0.6wheref is the focal length of the imaging lens,f.sub.1 is the focal length of the first lens component,d.sub.F is the distance between the surfaces of the first lens component that are nearest the object side and the image side, respectively, andd is the overall length of the imaging lens.