<p>The invention provides a substantially round illumination device (1) comprising a light source (10) and a substantially round waveguide (20). The waveguide (20) comprises a first waveguide surface (21), a second waveguide surface (22), a substantially round waveguide entrance window (23), a substantially round waveguide edge window (24), and a central axis (100). The first waveguide surface (21) or the second waveguide surface (22) or both the first waveguide surface (21) and the second waveguide surface (22) further comprise a plurality of elongated structures (200) each having an elongation axis (201) substantially parallel to a radius (101) perpendicular to the central axis (100).</p>
申请公布号
WO2009144638(A1)
申请公布日期
2009.12.03
申请号
WO2009IB52122
申请日期
2009.05.20
申请人
KONINKLIJKE PHILIPS ELECTRONICS N.V.;VISSENBERG, MICHEL, C., J., M.