The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 02, 2001
Filed:
Mar. 13, 2000
Hideo Kanda, Omiya, JP;
Noboru Koizumi, Omiya, JP;
Fuji Photo Optical Co., Ltd., Omiya City, JP;
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.