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. 27, 2001
Filed:
Aug. 30, 1999
John Michael Girkin, Dunbartonshre, GB;
Martin David Dawson, Glasgow, GB;
University of Strathclyde, Glasgow, GB;
Abstract
The light emitted by diodes of the Gallium Nitride type which comprises two distinguishable emissions is controlled by a single optical element (,) in the form of a lens having a central part and an annular part with different optical powers. The total output light of the diode may be collimated or brought to a common focus. The single optical element is preferably injection moulded and the annular part takes the form of a diffraction lens. The first part (,) is preferably a refractive lens which has a different optical power to the second part (,)which is preferably a diffractive lens. The optical power of the refractive lens (,) (the first optical power) and the optical power of the diffractive lens (,) (the second optical power) are selected to match the light source that the lens (,) is to be used with.