Emergency lighting element

Patent metadata

Field	Value
Publication number	US-12217599-B2
Application number	US-202218563395-A
Country	US
Kind code	B2
Filing date	May 20, 2022
Priority date	May 26, 2021
Publication date	Feb 4, 2025
Grant date	Feb 4, 2025

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.

First claim

The invention claimed is:

1. An emergency lighting element, comprising:
a planar, electrically operable radiation source for planar emission of electromagnetic radiation at a front side of the radiation source, wherein the radiation source is configured to emit electromagnetic radiation in the UV range;
a long-afterglow layer over a whole area on the front side of the radiation source; and
a UV filter tuned to the radiation of the radiation source is disposed on a side of the long-afterglow layer facing away from the radiation source,
wherein 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,
wherein 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, and
wherein emission of visible light by the emergency lighting element is effected solely by the long-afterglow layer.

2. The emergency lighting element as claimed in claim 1 , wherein:
the long-afterglow layer comprises a transparent or translucent matrix, with phosphorescent pigments embedded therein.

3. The emergency lighting element as claimed in claim 2 , wherein:
the transparent or translucent matrix comprises a polymer, acrylate, epoxy, silicone or glass, and the phosphorescent pigments comprise zinc sulfide or strontium aluminate.

4. The emergency lighting element as claimed in claim 1 , wherein:
the long-afterglow layer is designed in such a way that, after complete charging and subsequent darkness for 10 minutes, the long-afterglow layer emits a luminance of at least 0.03 mcd/m 2 .

5. The emergency lighting element as claimed in claim 1 , wherein:
the radiation source is designed for emitting electromagnetic radiation in the visible range and the long-afterglow layer is designed for partly transmitting the radiation, and
the emission of the radiation source and the transmission of the long-afterglow layer are coordinated with one another such that the emission of electromagnetic radiation in the visible range by the emergency lighting element is at least 50% higher when the radiation source is switched on compared with when the radiation source is switched off.

6. The emergency lighting element as claimed in claim 1 , wherein:
the radiation source is designed as a reflection layer for radiation impinging thereon at least in the visible range.

7. The emergency lighting element as claimed in claim 1 , wherein:
the planar radiation source is designed as a planar arrangement of a multiplicity of light-emitting diodes.

8. The emergency lighting element as claimed in claim 1 , wherein:
the planar radiation source is an electroluminescent film.

9. The emergency lighting element as claimed in claim 1 , wherein:
the thickness of the planar radiation source is less than 2.5 mm.

10. The emergency lighting element as claimed in claim 1 , wherein:
the thickness of the long-afterglow layer is at least 0.4 mm.

11. The emergency lighting element as claimed in claim 1 , further comprising:
for supplying the radiation source with electrical energy, a cable link or a coupling coil for wireless energy transmission.

12. The emergency lighting element as claimed in claim 1 , further comprising:
a control circuit configured to change a switch-on state of the radiation source, wherein the control circuit is printed onto a carrier material of the planar radiation source.

13. The emergency lighting element as claimed in claim 1 , further comprising,
for protection against external influences on a side of the long-afterglow layer facing away from the radiation source, a transparent or translucent protective layer or radiation source and long-afterglow layer arranged in a housing, which is transparent or translucent at least in a region of the long-afterglow layer.

14. The emergency lighting element as claimed in claim 1 , wherein:
the emergency lighting element is designed as an escape route marking.

15. The emergency lighting element as claimed in claim 1 , wherein:
the radiation source is configured to emit electromagnetic radiation exclusively in the UV range.

Assignees

• Lufthansa Technik Ag

Inventors

• Sutter Wolfgang

Classifications

• G08B7/062 Primary

  indicating emergency exits · CPC title

• F21V31/00

  Gas-tight or water-tight arrangements · CPC title

• F21V23/023

  Power supplies in a casing (F21V23/003 takes precedence) · CPC title

• F21V23/005

  the substrate is supporting also the light source · CPC title

• F21V13/08

  the elements being filters or photoluminescent elements and reflectors · CPC title