Patent Number: 6,297,916

Title: Imaging lens for interferometric device

Abstract: An imaging lens having three lens groups is designed so that image aberrations of an object at infinity (i.e, a collimated beam) and of an object at a finite distance are very well-corrected so that the imaging lens is particularly suitable for use imaging interference patterns formed on a screen by a grazing incidence interferometer. The imaging lens is composed of the following lens components, in successive order from the most object side: a first lens component having an overall meniscus shape with its concave surface on the object side, a second lens component having negative or positive refractive power, and a third lens component of positive or negative refractive power. The refractive power of the second lens component and the third lens component are always of opposite sign, and specified conditions are satisfied in order to assure high quality imaging. Each lens component may be formed of a single lens element or of multiple lens elements.

Inventors: Kanda; Hideo (Omiya, JP), Koizumi; Noboru (Omiya, JP)

Assignee: Fuji Photo Optical Co., Ltd.

International Classification: G02B 9/12 (20060101); G02B 009/12 (); G02B 013/18 (); G02B 026/08 ()

Expiration Date: 10/02/2018