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:
May. 05, 1998
Filed:
Dec. 21, 1995
Hitoshi Tamada, Kanagawa, JP;
Shuichi Matsumoto, Kanagawa, JP;
Noriaki Nishi, Chiba, JP;
Kimihiro Saito, Saitama, JP;
Sony Corporation, , JP;
Abstract
A polarization optical element causes minimum loss and provides light in the visible and near-infrared regions with practically satisfactory polarization contrast even when the grid period is comparatively long. Metal grids 1 are formed on a substrate 2 with a refractive index n.sub.1 to satisfy conditions 0.2<h/d<0.9, 0.5<b/d<0.9, and 70.degree.<s<110.degree., where 'h' is the thickness of a cross section of the grids; 'b' is the width of the cross section, measured along a line passing 0.5 h away from, and in parallel with, the base of the cross section; 'd' is the grid period; and 's' is the angle between the base and a leg of the cross section.