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. 14, 1984
Filed:
Nov. 04, 1981
William A Thornton, Cranford, NJ (US);
North American Philips Electric Corp., New York, NY (US);
Abstract
Color-corrected HID mercury-vapor lamp provides good color rendition of illuminated objects and also has a commercially desirable emission color. The lamp incorporates the usual arc tube which emits both ultraviolet radiations and visible radiations and the color-correcting phosphor components are carried on the inner surface of an outer protective envelope and comprise three different phosphor components. A first of the phosphor components has an emission confined to the shorter wavelength region of the visible spectrum with a peak of emission at from 440 nm to 470 nm. A second of the phosphor components is confined to the middle wavelength region of the visible spectrum with a peak of emission at from 520 nm to 560 nm and the third of the phosphor components has an emission confined to the longer wavelength region of the spectrum with its peak of emission at from 605 nm to 630 nm. When the composite visible emissions from the arc tube and the phosphor components are combined, the emission color of the lamp at least approximates a cool-white color which is positioned at least proximate the black body line. Thus, the normal yellow-green emission of an uncorrected HPMV lamp is substantially color corrected in all respects.