Light emitting device
First Claim
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1. A light emitting device comprising:
- at least one light source, anda light guide unit comprising at least a first light guide and a second light guide each comprising a light input end surface arranged to receive light emitted from said at least one light source, and a light output end surface arranged opposite said light input end surface, said first light guide and said second light guide of said light guide unit being arranged in a nested relationship,at least a first part of said first light guide and said second light guide having a thickness and 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, such that said first light guide and said second light guide both bend away from the center axis of the light guide unit in a plane parallel to the center axis;
at least a second part of the light guide unit being substantially straight and extending from the light input end in a direction substantially parallel to the center axis of the light guide unit,at least said first light guide of said light guide unit being ring-shaped in cross section,wherein a sum of the thicknesses of the first and second light guides at the first part is approximately equal to a combined thickness of the light guide unit at the second part, wherein the thickness of the first light guide and the second light guide is selected with respect to bending radius R to substantially avoid light leakage through a side surface of the first light guide and a side surface of the second light guide.
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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.
36 Citations
13 Claims
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1. A light emitting device comprising:
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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 receive light emitted from said at least one light source, and a light output end surface arranged opposite said light input end surface, said first light guide and said second light guide of said light guide unit being arranged in a nested relationship, at least a first part of said first light guide and said second light guide having a thickness and 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, such that said first light guide and said second light guide both bend away from the center axis of the light guide unit in a plane parallel to the center axis; at least a second part of the light guide unit being substantially straight and extending from the light input end in a direction substantially parallel to the center axis of the light guide unit, at least said first light guide of said light guide unit being ring-shaped in cross section, wherein a sum of the thicknesses of the first and second light guides at the first part is approximately equal to a combined thickness of the light guide unit at the second part, wherein the thickness of the first light guide and the second light guide is selected with respect to bending radius R to substantially avoid light leakage through a side surface of the first light guide and a side surface of the second light guide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification
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Current AssigneeSignify Holding B.V. (Signify N.V.)
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Original AssigneeSignify Holding B.V. (Signify N.V.)
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InventorsAnsems, Johannes Petrus Maria, Bukkems, Peter Johannes Martinus, Scaria, Abraham Vamattathil
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Primary Examiner(s)Garlen, Alexander K
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Assistant Examiner(s)Cattanach, Colin J
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Application NumberUS14/907,584Publication NumberTime in Patent Office1,763 DaysField of SearchUS Class CurrentCPC Class CodesF21K 9/232 specially adapted for gener...F21K 9/61 using light guidesF21V 2200/40 of hollow light guidesF21V 3/061 the material being glassF21V 3/062 the material being plasticsF21Y 2115/10 Light-emitting diodes [LED]G02B 6/0045 by shaping at least a porti...G02B 6/0075 Arrangements of multiple li...G02B 6/0076 Stacked arrangements of mul...
