Granted Patent B2

US 12,332,416 · App. 18/265,159 · Granted Jun 17, 2025

Inventors: Hugo Johan Cornelissen (Escharen, NL); Ties Van Bommel (Horst, NL)

Assignee: SIGNIFY HOLDING, B.V.

G02B19/0052F21K9/64F21V9/32F21V13/08G02B19/0028G02B19/0061F21Y2115/30

Abstract

Claims (20)

1. A light generating system comprising a lighting unit, a luminescent element, an optical element, and a reflective element, wherein:

the lighting unit is configured to generate a beam of unit light;

the luminescent element comprises a luminescent material configured to convert at least part of the unit light into luminescent material light; wherein the luminescent element comprises a first luminescent element face and a second luminescent element face, wherein at least part of the luminescent material is configured between the first luminescent element face and the second luminescent element face;

the optical element comprises an external surface, wherein the optical element is configured between the luminescent element and the reflective element, wherein a first part of the external surface is directed to the second luminescent face, wherein a second part of the external surface is directed to the reflective element, and wherein a third part of the external surface is configured in a light receiving relationship with the lighting unit; wherein a first area A1 of the first part of the external surface of the optical element is smaller than a second area A2 of the second part of the external surface of the optical element, wherein the optical element is transmissive for the unit light;

the reflective element is configured to reflect unit light; and

the lighting unit is configured such that in an operational mode the lighting unit is configured to irradiate the first luminescent element face via transmission through the optical element and reflection at the reflective element.

2. The light generating system according to claim 1 , wherein the lighting unit is configured such that in the operational mode the lighting unit is configured to irradiate at least 20% of the second part via transmission through the optical element, and via reflection at the reflective element at least 70% of the second element face; wherein the reflective element is specular reflective.

3. The light generating system according to claim 1 , wherein the optical element comprises a first face comprising the first part, a second face comprising the second part, and one or more third faces comprising the third part, wherein the first face and the second face are configured parallel, wherein the first face is in physical contact with the luminescent element, wherein the second face is in physical contact with the reflective element, wherein the third face and the first face have a first mutual angle α 1,3 , and wherein the third face and the second face have a second mutual angle α 2,3 , wherein 100°≤α 1,3 ≤175°, and wherein 5°≤α 2,3 ≤80°.

4. The light generating system according to claim 1 , wherein in a first plane (P 1 ) perpendicular to the second part, relative to a first normal (N 1 ) to the second part and configured in the first plane (P 1 ), the beam has a smallest incidence angle (α 1 ) on the third part and a largest incidence angle (α 2 ) on the third part, wherein the third part has a third angle (α 3 ) with the normal (N 1 ), wherein α3>α1, and wherein the beam of unit light is defined by at least 1/e 2 of a maximum of a spectral power of the unit light.

5. The light generating system according to claim 4 , wherein the third angle (α3) is selected from the range of 15-75°.

6. The light generating system according to claim 4 , wherein the beam of unit light is selected from the group consisting of a focused beam, and a collimated beam.

7. The light generating system according to claim 4 , wherein the lighting unit comprises a light source configured to generate light source light, wherein the unit light comprises at least part of the light source light; wherein the light source is selected from the group consisting of a laser diode and a superluminescent diode.

8. The light generating system according to claim 7 , wherein the lighting unit further comprises one or more second optical elements configured to one or more of (i) shape the beam of unit light, and (ii) direct the beam of unit light.

9. The light generating system according to claim 4 , wherein the optical element has the shape of a frustum.

10. The light generating system according to claim 9 , comprising a second reflective element, wherein the second reflective element is configured to reflect unit light that escapes from the optical element via the one or more third faces back into the optical element, wherein the third part has a third area A3, wherein the one or more third faces have a fourth area A4, wherein at least 50% of the fourth area A4 is directed to the second reflective element and wherein at maximum 25% of the fourth area A4 is defined by the third area A3.

11. The light generating system according to claim 4 , comprising a thermally conductive element, wherein the reflective element is defined by the thermally conductive element or is configured as reflective layer on the thermally conductive element; and wherein the thermally conductive element comprises a heatsink.

12. The light generating system according to claim 4 , wherein the optical element is selected from the group consisting of a ceramic body, a single crystal, glass, and quartz; and wherein the luminescent material comprise a luminescent material of the type A 3 B 5 O 12 :Ce, wherein A comprises one or more of Y, La, Gd, Tb and Lu, and wherein B comprises one or more of Al, Ga, In and Sc.

13. The light generating system according to claim 4 , comprising a plurality of lighting units configured to irradiate different parts of the third part of the externa surface.

14. An integrated light source package comprising the light generating system according to claim 4 .

15. A light generating device selected from the group of a lamp, a luminaire, a projector device, a disinfection device, and an optical wireless communication device, comprising the light generating system according to claim 4 .

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (12)