Appeal No. 96-2138
Application 07/967,607
The disclosed invention is directed to a fluorescent lamp
having a coating comprising a blend of halophosphate phosphors
and a quad-phosphor blend for economically elevating color
rendering while retaining high light flux.
Claim 1 is reproduced below.
1. A fluorescent lamp comprising a glass envelope having
electrodes at its ends, a mercury and inert gas filling
within said envelope which produces ultraviolet radiation, a
coating on the interior surface of the glass envelope
comprising a blend of alkaline earth metal halophosphate
phosphors and a quad-phosphor blend for converting a
substantial portion of said ultraviolet radiation to visible
illumination having a white color wherein the combination of
phosphors result in a predetermined color point from about
2700 to about 4200 K on or near the Planckian locus, said
quad-phosphor blend comprising a red color emitting phosphor
component having a visible emission spectrum principally in
the 590 to 630 nm wavelength range, blue color emitting
phosphor component having an emission spectrum principally
in the 430 to 490 nm wavelength range, and a green color
emitting phosphor component having an emission spectrum
principally in the 500 to 570 nm wavelength range, said
quad-phosphor blend additionally includes an europium
activated aluminate green emitting phosphor component
wherein both the quad-blend and said blend of alkaline earth
metal halophosphate phosphors substantially match the
desired predetermined color point.
The examiner relies on the following references:
Konings et al. (Konings) 5,105,122 April 14, 1992
Northrop et al. (Northrop) 5,122,710 June 16, 1992
Taubner et al. (Taubner) 5,196,234 March 23, 1993
(effective filing date August 29, 1986)
McSweeney 5,232,626 August 3, 1993
(filed June 22, 1992)
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