Lamp with multi-layer phosphor coating

Details Lamp with multi-layer phosphor coating Lamp with multi-layer phosphor coating

2005-05-24

2008-07-22

Williams, Joseph L (Department: 2889)

Electric lamp and discharge devices

With gas or vapor

Envelope with particular structure

C313S485000, C313S493000, C252S30140R

Reexamination Certificate

active

07402955

ABSTRACT:
A lamp envelope is provided with an alumina layer and a multilayer phosphor coating on the alumina layer. The phosphor coating includes a top phosphor layer with a first weight percent of rare earth activators and a middle phosphor layer with a second weight percent of rare earth activators. The second weight percent is less than the first weight percent so that a total amount of the activators in the coating is reduced while maintaining a required lamp brightness and color rendering index (CRI). Preferably, the second weight percent is about 50-60% of the first weight percent and the middle layer is about 30-50% of a total weight of the coating so that a total weight of the activators in the coating is no more than about 80% of a weight of the activators in the coating if the first and second weight percents were the same.

REFERENCES:
patent: 4079288 (1978-03-01), Maloney et al.
patent: 4088923 (1978-05-01), Manders
patent: 4305019 (1981-12-01), Graff et al.
patent: 4431941 (1984-02-01), Roy et al.
patent: 4623816 (1986-11-01), Hoffman et al.
patent: 4806824 (1989-02-01), Paynter et al.
patent: 4879492 (1989-11-01), Latassa et al.
patent: 4924141 (1990-05-01), Taubner et al.
patent: 5008789 (1991-04-01), Arai et al.
patent: 5726528 (1998-03-01), Jansma et al.

Affiliated with

Also associated with

Rating

Lamp with multi-layer phosphor coating does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lamp with multi-layer phosphor coating, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lamp with multi-layer phosphor coating will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3971315