Spherical lighting device

Patent metadata

Field	Value
Publication number	US-2016327240-A1
Application number	US-201415107780-A
Country	US
Kind code	A1
Filing date	Dec 22, 2014
Priority date	Dec 26, 2013
Publication date	Nov 10, 2016
Grant date	—

Abstract

A lighting device including: a source emitting a light cone; an electronic control circuit; a wall defining an enclosure including a first area through which the light cone passes, and a second area complementary to the first area; and a diffuser directing part of the light by backscattering towards the second area. The diffuser includes a first part oriented perpendicular to the axis of revolution of the light cone and forming a first divergent lens, and a second part forming a second divergent lens having a shape of a flared truncated cone with its axis of revolution parallel to the axis of revolution of the light cone, in which a larger diameter end is closest to the light source and a smaller diameter end is adjacent to the first part and surrounds the first part.

First claim

1 - 15 (canceled)

16 . A lighting device comprising:
a light source configured to emit light as a light cone; an electronic circuit to control the light source; a wall with a shape that defines an enclosure surrounding the light source and the electronic circuit, the wall including at least a first area corresponding to an intersection with the light cone, and a second area complementary to the first area; a diffuser comprising a material diffusing light arranged inside the enclosure between the light source and the first area, the diffuser configured to direct part of the light by backscattering towards the second area; wherein the electronic circuit is placed in a first part of the enclosure as an upper part, the light cone being emitted from the light source to a second part of the enclosure as a lower part; and wherein the diffuser comprises a first part oriented perpendicular to the axis of revolution of the light cone and forming a first divergent lens, and a second part forming a second divergent lens, the second part having a shape of a flared truncated cone with its axis of revolution parallel to the axis of revolution of the light cone, wherein a larger diameter end is closest to the light source and a smaller diameter end is adjacent to the first part and surrounds the first part.

17 . The lighting device according to claim 16 , wherein the diffuser comprises a material that is transparent or translucent to light emitted by the light source.

18 . The lighting device according to claim 16 , wherein the diffuser comprises a material with a reduced diffusion coefficient between 10 and 100 cm −1 .

19 . The lighting device according to claim 16 , wherein the diffuser comprises a material with a reduced diffusion coefficient between 40 cm −1 and 90 cm −1 .

20 . The lighting device according to claim 16 , wherein the radius of curvature of the second divergent lens is less than the radius of curvature of the first divergent lens.

21 . The lighting device according to claim 16 , wherein the diffuser further comprises a third part forming a third convergent lens, the third part being in a form of a flared truncated cone of which the axis of revolution is parallel to the axis of revolution of the light cone and a larger diameter end is adjacent to the second part.

22 . The lighting device according to claim 20 , wherein the diffuser further comprises a fourth part surrounding the control circuit and providing mechanical support for the control circuit.

23 . The lighting device according to claim 16 , wherein the diffuser is configured such that light emitted by the light source is directed toward the first part and the second part of the diffuser.

24 . The lighting device according to claim 16 , wherein the control circuit is fixed to the light source.

25 . The Lighting device according to claim 16 , wherein the control circuit comprises at least one battery and an inductively coupled charging system for the at least one battery.

26 . The lighting device according to claim 16 , wherein the light source is located at a height lower than the median plane of the cone.

27 . The lighting device according to claim 16 , wherein the wall forming the enclosure comprises a transparent or translucent material.

28 . The lighting device according to claim 16 , wherein the wall forming the enclosure comprises low density polyethylene or glass.

29 . The lighting device according to claim 16 , wherein the wall forming the enclosure is between 100 μm and 1 cm thick.

30 . The lighting device according to claim 16 , wherein the diffuser comprises polyvinyl chloride.

31 . A lighting system comprising a set of lighting devices according to claim 16 .

Assignees

• Commissariat L Energie Atomique Et Aux Energies Alternatives

Inventors

• Goujon Charles-Elie

Classifications

• F21V7/28

  characterised by coatings · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21S9/02

  the power supply being a battery or accumulator · CPC title

• F21S8/03

  of surface-mounted type (F21S8/02, F21S8/04 take precedence; details of wall or floor bases F21V21/02) · CPC title

• F21V5/046 Primary

  the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring · CPC title