LIGHT EMITTING DEVICE

• US 20160178139A1
• Filed: 08/06/2014
• Published: 06/23/2016
• Est. Priority Date: 08/06/2013
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Koninklijke Philips N.V.
• Inventors: ANSEMS, JOHANNES PETRUS MARIA, BUKKEMS, PETER JHHANNES MARTI, SCARIA, ABRAHAM VAMATTATHIL
• Granted Patent: US 10,309,585 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/61 using light guides
• CPC Class Codes: F21V 2200/40 of hollow light guides
• CPC Class Codes: F21V 3/061 the material being glass
• CPC Class Codes: F21V 3/062 the material being plastics
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0045 by shaping at least a portion of the light guide
• CPC Class Codes: G02B 6/0075 Arrangements of multiple light guides G02B6/0028 takes precedence
• CPC Class Codes: G02B 6/0076 Stacked arrangements of multiple light guides of the same or different cross-sectional area

Abstract

A light emitting device (1) comprising at least one light source (2), and a light guide unit comprising at least a first light guide (3) and a second light guide (4) each comprising a light input end surface (6, 31, 41) arranged to, when in operation, receive light emitted from the at least one light source and a light output surface (7, 32, 42), at least a part (8) of the first light guide and the second light guide near the light output end surface being bent in a bending radius (R), at least the first light guide of the light guide unit being ring-shaped in cross section, and the first light guide and the second light guide of the light guide unit being arranged in a nested relationship.

Claims

1. A light emitting device comprising:

at least one light source, and

a light guide unit comprising at least a first light guide and a second light guide each comprising a light input end surface arranged to, when in operation, receive light emitted from said at least one light source and a light output end surface arranged opposite said light input end surface,

at least a part of said first light guide and said second light guide being bent in a bending radius R in between the light input end surface and the light output end surface near said light output end surface,

at least said first light guide of said light guide unit being ring-shaped in cross section, and

said first light guide and said second light guide of said light guide unit being arranged in a nested relationship.

2. A light emitting device according to claim 1, wherein said first light guide and said second light guide comprise a first surface and a second surface and are arranged such that the first surface of one of the first light guide and the second light guide extend in parallel with and adjacent to the second surface of the other of the first light guide and the second light guide.

3. A light emitting device according to claim 2, wherein the first surface of one of the first light guide and the second light guide is arranged abutting the second surface of the other of the first light guide and the second light guide.

4. A light emitting device according to claim 1, wherein said second light guide of said light guide unit is ring-shaped in cross section.

5. A light emitting device according to claim 1, wherein said light guide unit further comprises a central cavity around which said first light guide and said second light guide extend.

6. A light emitting device according to claim 1, and further comprising at least one further light guide arranged in a nested relationship with said first light guide and said second light guide.

7. A light emitting device according to claim 1, wherein said light guide unit is ring-shaped seen in a cross section extending perpendicular to a center axis of said light guide unit.

8. A light emitting device according to claim 1, wherein said light guide unit is substantially funnel-shaped.

9. A light emitting device according to claim 1, wherein said light guide unit is substantially funnel-shaped seen in a cross section extending in parallel with a center axis of said light guide unit.

10. A light emitting device according to claim 1, wherein said light guide unit comprises two light output end surfaces.

11. A light emitting device according to claim 1, wherein said light output end surface of said light guide unit is wave-shaped.

12. A light emitting device according to claim 1, wherein said light output end of said light guide unit is provided with a plurality of prism structures.

13. A light emitting device according to claim 1, wherein said at least one light source is a lambertian light source.

14. A light emitting device according to claim 1, wherein said at least one light source is an LED, a plurality of LEDs or a remote phosphor light source.

15. A lamp comprising an outer cover, a base and a light emitting device according to claim 1 arranged on said base and covered by said cover.