Patent · US Active

Emergency lighting element

US12217599B2 · kind B2 · utility

0Cited by

4References

15Claims

0Family size

Assignee

LUFTHANSA TECHNIK AG · DE

Inventor

Wolfgang Sutter · Halstenbek, DE

Key dates

Filing date	May 20, 2022
Grant date	Feb 4, 2025
Priority date	—
Expiry date	May 20, 2042

Classification

Technology area (CPC H)Electricity
CPC primaryH02J50/005
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An emergency lighting element includes a planar, electrically operable radiation source for planar emission of electromagnetic radiation at a front side of the radiation source; and a long-afterglow layer over a whole area on the front side of the radiation source. A penetration depth into the long-afterglow layer for radiation emitted by the radiation source corresponds at least to a thickness of the long-afterglow layer. The long-afterglow layer comprises phosphorescent material, an absorption spectrum of the long-afterglow layer at least partly overlaps an emission spectrum of the radiation source and an emission spectrum of the long-afterglow layer lies substantially in a visible range.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.