Optical arrangement with a light transmitting layer arranged to cover a portion of light entry surface of light guide and to transmit light diffusively
First Claim
1. An optical arrangement comprising:
- a light guide (101) havinga light-entry portion (103) with a light-entry surface (105),a tapering portion (107) with a light reflecting surface (111),a light-exit surface (109),the light-entry portion (103) being arranged to guide light from the light-entry surface (105) in a first direction (x) towards the light reflecting surface (111), the light reflecting surface being arranged in relation to the first direction (x) so that incident light from the light-entry portion (103) is reflected towards the light-exit surface (109);
a light transmitting layer (113) adapted to transmit light diffusively and arranged to cover at least a portion of the light-entry surface (105) of the light guide (101), wherein the light transmitting layer is a light emitting layer adapted to emit light in response to excitation by light;
a light source arranged to directly or indirectly illuminate the light transmitting layer;
a re-transmitting light source (115) arranged to illuminate the light transmitting layer (113) in response to illumination by the light source (117);
a transmissive re-direction layer (121), which covers the light-exit surface (109) of the light guide (101) and has triangular elements (123) formed in the surface of the layer facing the light-exit-surface (109) of the light guide (101); and
a second light guide (153;
157) arranged to guide light to the light transmitting layer (113), said second light guide being adapted to guide light in the second light guide'"'"'s interior along a guide direction (y) using reflections in lateral surfaces (155;
159) of the second light guide, which surfaces are substantially parallel to said guide direction (y), the second light guide having a light input area (158) for in-coupling of light and a light output area (168) for output of light to the light transmitting layer (113), wherein the light output area (168) is arranged at a distance from the light input area (158) in the guide direction (y).
1 Assignment
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Accused Products
Abstract
An optical arrangement comprising a light guide (101) having a light-entry portion (103) with a light-entry surface (105), a tapering portion (107) with a light reflecting surface, and a light-exit surface (109). The light-entry portion (103) is arranged to guide light from the light-entry surface (105) in a first direction (x) towards the light reflecting surface (H I), the light reflecting surface being arranged in relation to the first direction (x) so that incident light from the light-entry portion (103) is reflected towards the light-exit surface (109). A light transmitting layer (113) is adapted to transmit light diffusively and arranged to cover at least a portion of the light-entry edge surface (105) of the light guide (101). The arrangement is e.g. suitable for use in a LED based luminaire and allows for efficiency and forming of a light beam able to fulfill glare requirements. The arrangement may advantageously be used in a downlighting application.
40 Citations
13 Claims
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1. An optical arrangement comprising:
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a light guide (101) having a light-entry portion (103) with a light-entry surface (105), a tapering portion (107) with a light reflecting surface (111), a light-exit surface (109), the light-entry portion (103) being arranged to guide light from the light-entry surface (105) in a first direction (x) towards the light reflecting surface (111), the light reflecting surface being arranged in relation to the first direction (x) so that incident light from the light-entry portion (103) is reflected towards the light-exit surface (109); a light transmitting layer (113) adapted to transmit light diffusively and arranged to cover at least a portion of the light-entry surface (105) of the light guide (101), wherein the light transmitting layer is a light emitting layer adapted to emit light in response to excitation by light; a light source arranged to directly or indirectly illuminate the light transmitting layer; a re-transmitting light source (115) arranged to illuminate the light transmitting layer (113) in response to illumination by the light source (117); a transmissive re-direction layer (121), which covers the light-exit surface (109) of the light guide (101) and has triangular elements (123) formed in the surface of the layer facing the light-exit-surface (109) of the light guide (101); and a second light guide (153;
157) arranged to guide light to the light transmitting layer (113), said second light guide being adapted to guide light in the second light guide'"'"'s interior along a guide direction (y) using reflections in lateral surfaces (155;
159) of the second light guide, which surfaces are substantially parallel to said guide direction (y), the second light guide having a light input area (158) for in-coupling of light and a light output area (168) for output of light to the light transmitting layer (113), wherein the light output area (168) is arranged at a distance from the light input area (158) in the guide direction (y). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification