US 12,410,891 B2
Lightguide lamp with crosstalk prevention
Jan De Graaf, Uden (NL); and Johannes Petrus Maria Ansems, Hulsel (NL)
Assigned to SIGNIFY HOLDING B.V., Eindhoven (NL)
Appl. No. 18/851,856
Filed by SIGNIFY HOLDING B.V., Eindhoven (NL)
PCT Filed Mar. 23, 2023, PCT No. PCT/EP2023/057530
§ 371(c)(1), (2) Date Sep. 27, 2024,
PCT Pub. No. WO2023/186708, PCT Pub. Date Oct. 5, 2023.
Claims priority of application No. 22165138 (EP), filed on Mar. 29, 2022.
Prior Publication US 2025/0207742 A1, Jun. 26, 2025
Int. Cl. G03B 21/20 (2006.01); F21K 9/278 (2016.01); F21K 9/61 (2016.01); F21K 9/68 (2016.01)
CPC F21K 9/61 (2016.08) [F21K 9/278 (2016.08); F21K 9/68 (2016.08)] 13 Claims
OG exemplary drawing
 
1. A light generating system comprising a first light generating device, a second light generating device, a lightguide element, and an optical filter; wherein the light generating system is configured to generate system light; wherein:
the first light generating device comprises (i) a first light source, comprising a solid state light source, configured to generate first light source light and (ii) a first luminescent material; wherein the first luminescent material is excitable by one or more excitation wavelengths, wherein the first luminescent material is configured to convert at least part of the first light source light into first luminescent material light; wherein the first light generating device is configured to generate first device light comprising the first luminescent material light;
the second light generating device, comprising a solid state light source, is configured to generate second device light having a second device light spectral power distribution, wherein the second device light spectral power distribution and the one or more excitation wavelengths have an at least partially spectrally overlapping wavelength range;
the lightguide element comprises a light transmissive body comprising light transmissive material, which is light transmissive for the device light; wherein the light transmissive body comprises an axis of elongation and a body length defined parallel to the axis of elongation, wherein the light transmissive body comprises a first end and a second end defining the body length; wherein the light transmissive body comprises (i) a first outer face, comprised by the first end, (ii) a second outer face, comprised by the second end, and (iii) an external side face bridging a distance between the first outer face and the second outer face and having a distance to the axis of elongation; wherein the first outer face, the second outer face, and the external side face define at least part of an external surface of the light transmissive body;
the optical filter is configured downstream of the first light generating device and upstream of the first outer face, wherein the optical filter has a higher transmission for the first luminescent material light than for a wavelength selected from the at least partially spectrally overlapping wavelength range; and
the light generating devices and the lightguide element, are configured such that (i) at least part of the device light is coupled in the lightguide element via the first outer face, (ii) at least part of the incoupled device light escapes from the lightguide element via the external side face and/or via the second outer face; and
wherein the light generating system further comprising a light transmissive envelope, wherein at least part of the lightguide element is configured within the light transmissive envelope, wherein the light transmissive envelope is transmissive for at least part of the device light; and wherein d1<L1; and
wherein the first device light is white light or has a color point in the green-yellow wavelength range, and wherein the second device light has a color point in the blue-green wavelength range; and wherein the system light comprises one or more of the first device light and the second device light.