"Embodiment of claim 10 specifies that the light source may be arranged to directly or indirectly illuminate the light transmitting layer and the optical module may further include a re-transmitting light source arranged to illuminate the light transmitting layer in response to illumination by the light source. The re-transmitting light source may be adapted to emit light in response to excitation by light, preferably by comprising a phosphor material. This e.g. allows a phosphor layer to be used to generate light, e.g. by illumination from a LED, without arranging the phosphor to cover the light-entry surface, and thus the phosphor can be shielded from being visible via the light-exit surface. One advantage from this is that a colored appearance, such as yellow, can be avoided when e.g. a luminaire comprising the optical arrangement is in a off-state.
"Embodiment of claim 11 provides that the light transmitting layer may be arranged less than 1 mm, preferably substantially equidistantly, from the light-entry surface, and more preferably as close as possible to the light-entry surface without being in optical contact. An advantage from non-optical contact is that light rays, emitted by the light emitting layer and coupled into the light guide, will be refracted with a collimating effect.
"Alternatively, the light transmitting layer may be in optical contact with the light-entry surface. This has another advantage, viz. that light more efficiently can be coupled into the light guide since reflections in the light-entry surface can be avoided.
"Hereinafter, an embodiment of the invention will be described in further detail. It should be appreciated, however, that this embodiment may not be construed as limiting the scope of protection for the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS
"In all figures, the dimensions as sketched are for illustration only and do no reflect the true dimensions or ratios. All figures are schematic and not to scale. In particular the thicknesses are exaggerated in relation to the other dimensions. In addition, details such as LED chip, wires, substrate, housing, etc. have been omitted from the drawings for clarity.
"FIG. 1 illustrates relationship between the beamwidth of the light output and the size of a source cavity of one type of prior art luminaire.
"FIG. 2A shows a cross-sectional side view of one luminaire arrangement, a segment of which may be used in an optical module according to an embodiment of the present invention;
"FIG. 2B shows a top view of the luminaire arrangement in FIG. 2A;
"FIG. 3A shows a cross-sectional side view of another luminaire arrangement, a segment of which may be used in an optical module according to an embodiment of the present invention;
"FIG. 3B shows a top view of the luminaire arrangement in FIG. 3A;
"FIG. 4 sets forth a flow diagram of method steps for designing an optical module using segments of either the luminaire arrangement illustrated in FIGS. 2A-2B or the luminaire arrangement illustrated in FIGS. 3A-3B, according to an embodiment of the present invention;
"FIGS. 5A-5D provide schematic illustrations of the design steps set forth in FIG. 4; and
"FIGS. 6A-6D show various embodiments for directing light emitted by each of the light sources towards the collimating structure of the corresponding segment."
For additional information on this patent application, see: Desmet,
Keywords for this news article include: Koninklijke Philips Electronics N.v.
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