Light emitting system producting beam with adjustable width
AssigneeKoninklijke Philips Electronics N.V.
InventorMatthias Jouffrieau
Life of this patent
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Abstract
A light emitting system (1) for outputting a light beam comprising: an optical arrangement comprising at least one light source, for emitting a light beam having a determinate width and a determinate length on a projection plane placed at a determinate distance from the optical arrangement, an optical device (2) movable into a plurality of angular positions, by rotation around a rotation axis (Z1), and comprising optical elements arranged for varying the width of the light beam when the optical device is rotated.
Claims17
(canceled)
A light emitting system (1) according to claim 19, wherein the optical arrangement is arranged to output a light beam generally directed to a determinate direction substantially perpendicular the optical device.
4-6. (canceled)
A light emitting system (1) as claimed in claim 19, wherein the concavity of said reflector (5) is a parabola and the at least one light source is located on the focal axis of the parabola.
A light emitting system (1) as claimed in claim 19, wherein the reflector (5) further comprises lateral reflective surfaces located laterally to the concave reflective surface.
A light emitting system (1) as claimed in claim 19, wherein the reflector (5) is geometrically symmetrical with respect to at least one symmetry plane (P,P′), and wherein the rotation axis (Z1) is contained in this at least one symmetry plane (P,P′).
A light emitting system as claimed in claim 19, wherein the optical arrangement comprises an arrangement (3) of at least two light sources (4) which are aligned along a light source axis (X1).
A light emitting system (1) as claimed in claim 19, wherein the said light source(s) (4) comprise(s) LED(s).
A light emitting system (1) as claimed in claim 19, wherein said reflector (5) of light sources (4) is movable into a plurality of angular positions, by rotation around a third rotation axis (X3) corresponding to said rotation axis (Z1).
A light emitting system (1) as claimed in claim 19, wherein the optical elements of the optical device (2) comprise concave and/or convex elongated optical elements (21) arranged according to parallel arrays or comprise diffraction optical elements forming a diffraction network for diffracting differently along the said width than along the length of the light beam.
A light emitting system (1) as claimed in claim 19, wherein the optical arrangement is arranged so as to emit a light beam having a rectangular shape on a projection plane.
A light emitting system for outputting a light beam comprising an optical arrangement and an optical device, wherein the optical arrangement comprises:
- at least one light source for emitting a light beam having a pre-determined width on a projection plane placed at a pre-determined distance from the optical arrangement;
- a reflector facing the optical device for back-reflecting the light emitting by the at least one light source towards the optical device, the reflector comprising a transversally concave reflective surface extending longitudinally according to a reflector axis;
- and
- wherein the optical device is movable into a plurality of angular positions, by rotation around a rotation axis, and comprises one or more optical elements arranged for varying the width of the emitted light beam on the projection plane when the optical device is rotated.
Dependencies are inferred from the claim text.