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:
Aug. 01, 2006
Filed:
Sep. 03, 2004
Kimio Ito, Tokyo, JP;
Mitsuru Kitamura, Tokyo, JP;
Kimio Ito, Tokyo, JP;
Mitsuru Kitamura, Tokyo, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
The invention relates to a diffractive optical system having a two-dimensional structure, which can be used as a phase shift mask for the fabrication of an optical element having a two-dimensional fine periodic structure, and a two-dimensional light beam splitter. The diffractive optical systemcomprises a transparent substrate surfacethat is divided in alignment with orthogonal two directions into minuscule square cell groupsof the same shape in a checked pattern. The square cells that give a phase 2pπ and a phase {(2q+1)π±δπ} where 0≦δ≦0.25 and p and q are each an integer with respect to reference-wavelength light striking vertically on the transparent substrate surfaceare alternately arranged in each direction, and the phase 2pπ-giving square cells and the phase {(2q+1)π±δπ}-giving square cells are located in such a way as to be in alignment with 45° diagonal directions of said two directions.