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:
Feb. 14, 2006
Filed:
Sep. 15, 2004
Toru Nakamura, Kawasaki, JP;
Toru Nakamura, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
A diffractive optical element simultaneously realizes a plurality of optical functions and is small in size and excellent in productivity. The diffractive optical element has a multilayer member composed of a plurality of layers each of which is made of an optical material. Adjacent layers of the multilayer member are in contact with each other, and have different refractive indexes from each other. The multilayer member includes boundary faces between the contacted adjacent layers. Uneven patterns that cause transmitted light to undergo desired diffraction are formed on at least two faces of three faces including the boundary faces and outer surfaces of the multilayer member. The uneven patterns formed on different faces have different shapes or sizes in the direction of the layers of the multilayer member.