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:
Jun. 29, 2004
Filed:
Apr. 25, 2002
Yehuda Niv, Nes Ziona, IL;
Uzia Nivon, Moshav Kidron, IL;
Planop Planar Optics Ltd., Rehovot, IL;
Abstract
A diffractive optical element for guiding a light having a color spectrum characterized by a plurality of wavelengths longer than a shortest wavelength, &lgr; , and shorter than a longest wavelength, &lgr; , the light striking the diffractive optical element at an angle greater than a first field-of-view angle, &agr; , and smaller than a second field-of-view angle, &agr; . The diffractive optical element comprising a linear grating being formed in a light-transmissive substrate. The linear grating is characterized by a pitch, d, selected so as to allow total internal reflection of a light having wavelength of &lgr; and a striking angle of &agr; . The light-transmissive substrate is characterized by an index of refraction, n , larger than a minimal index of refraction, n , which is selected so as to allow total internal reflection of a light having wavelength of &lgr; and a striking angle of &agr; .