Light signalling slab and system capable of using such a slab

Patent metadata

Field	Value
Publication number	US-10774486-B2
Application number	US-201816486285-A
Country	US
Kind code	B2
Filing date	Feb 15, 2018
Priority date	Feb 17, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

The invention relates to a one-piece light signalling slab ( 2 ) comprising a structure with a plurality of layers that are superposed and attached together, said structure comprising:
A first transparent or translucent layer ( 200 ) forming a front face of said slab;
A light assembly ( 201 ) comprising a plurality of light emitting diodes (Ds) electrically connected together;
An assembly ( 202 a, 202 b ) encapsulating said plurality of light emitting diodes;
A second layer ( 203 ) forming a rear face of said plate and being made up of a composite polymer/fibreglass material; Said encapsulating assembly being positioned between said first layer ( 200 ) and said second layer ( 203 ).

First claim

The invention claimed is:

1. An apparatus comprising a slab, wherein said slab is a luminous signaling slab, wherein said slab is of integral construction and comprises a structure having superposed layers that are fastened to one another, wherein said structure comprises a first layer, a luminous assembly, and encapsulating assembly, and a second layer, wherein said first layer forms a front face of said slab, wherein said first layer is transparent or translucent, wherein said luminous assembly comprises light-emitting diodes that are electrically connected to one another, wherein said encapsulating assembly encapsulates said light-emitting diodes, wherein said second layer forms a back face of said slab, wherein said second layer comprises at least one of a polymer and a composite of polymer and glass fiber, and wherein said encapsulating assembly is positioned between said first layer and said second layer.

2. The apparatus of claim 1 , wherein said first layer of said slab comprises tiles, wherein each tile faces at least one light-emitting diode.

3. The apparatus of claim 1 , wherein the first layer of said slab comprises a polymer selected from the group consisting of polycarbonate, polymethyl methacrylate, ethylene tetrafluoroethylene and polyvinylidene fluoride.

4. The apparatus of claim 1 , wherein said first layer has a thickness in excess of a hundred micrometers.

5. The apparatus of claim 1 , wherein the second layer of said slab has a stiffness defined by a Young's modulus, wherein, at room temperature, said stiffness is higher than a gigapascal.

6. The apparatus of claim 1 , wherein said second layer of said slab has a thickness that is between 0.3 millimeters and 3 millimeters.

7. The apparatus of claim 1 , wherein said light-emitting diodes are organized in a ribbon, wherein said ribbon is deposited on said second layer, on a carrier or connected to a printed circuit board.

8. The apparatus of claim 1 , wherein said second layer comprises a printed circuit board to which said light-emitting diodes are directly connected.

9. The apparatus of claim 1 , wherein the encapsulating assembly is made from a material having a Young's modulus, wherein, at room temperature, said modulus is in excess of fifty megapascals.

10. The apparatus of claim 1 , wherein said encapsulating assembly has a thickness that is between a hundred micrometers and four millimeters.

11. The apparatus of claim 1 , wherein the structure comprises at least one intermediate layer, arranged between said first layer and the encapsulating assembly and configured to join said first layer to the encapsulating assembly by adhesive bonding.

12. The apparatus of claim 11 , wherein said intermediate layer is made from one or more materials selected from the group consisting of polyolefin, rubber, elastomer, and epoxy.

13. The apparatus of claim 12 , wherein the intermediate layer is configured to have a Young's modulus at room temperature lower than or equal to 100 MPa.

14. The apparatus of claim 12 , wherein said intermediate layer has a thickness that is between 200 micrometers and 1600 micrometers.

15. The apparatus of claim 1 , wherein said structure comprises an adhesive layer located on said back face, wherein said adhesive layer contacts said second layer.

16. The apparatus of claim 1 , wherein said structure comprises a tread applied to said first layer, wherein said tread is non-opaque and wherein said tread has a textured and irregular surface.

17. The apparatus of claim 1 , further comprising a crossable zone equipped with a base layer, wherein said slab is fastened to said base layer, wherein said slab is positioned so as to form at least part of a marking on said crossable zone when said luminous assembly is turned on.

18. The apparatus of claim 1 , wherein said first layer has a thickness that is between 200 micrometers and 3200 micrometers.

19. The apparatus of claim 1 , wherein said first layer has a thickness that is between 400 micrometers and 750 micrometers.

20. The apparatus of claim 1 , wherein said encapsulating assembly has a thickness that is between two hundred and fifty micrometers and a millimeter.

Assignees

• Commissariat Energie Atomique
• Colas Sa

Inventors

• De Bettignies Rémi
• Barruel Franck
• Guillerez Stéphane
• Coquelle Eric
• Soulima Valérian
• Chaintreuil Nicolas
• Therme Jean

Classifications

• H10H20/855

  Optical field-shaping means, e.g. lenses · CPC title

• H10H20/853

  characterised by their shape · CPC title

• H10F19/906

  characterised by the materials of the structures · CPC title

• G08G1/095

  Traffic lights · CPC title

• G08G1/005

  including pedestrian guidance indicator · CPC title