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. 26, 2004
Filed:
Jul. 13, 2001
Roger L. Frick, Hackensack, MN (US);
Charles R. Willcox, Eden Prairie, MN (US);
Rosemount Inc., Eden Prairie, MN (US);
Abstract
A diffractive optical element (DOE) is shown formed on a substrate. The DOE is characterized, in one embodiment, by being formed from a plurality of members that are each individually created on a top surface of the substrate. The members may be formed by depositing a poly-silicon material on the substrate or by growing a silicon crystal on the substrate and performing an etch step. The substrate may be formed of a sapphire crystal. The DOE may be used to reflect incident light traveling within the substrate under total internal reflection. The widths, spacing between, and heights of the strips forming the DOE may be designed so as to reflect the incident light within the substrate in a direction of propagation acute to that of the incident light.