Range sensing and safety system for a luminaire

Patent metadata

Field	Value
Publication number	US-12328802-B2
Application number	US-202418801149-A
Country	US
Kind code	B2
Filing date	Aug 12, 2024
Priority date	Aug 30, 2023
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

An automated luminaire and method are provided. The automated luminaire includes a range sensing module and a control system. The range sensing module calculates a distance to a closest object in a direction that the automated luminaire is pointed. The control system reduces a beam power density of a light beam emitted from the automated luminaire when the distance is less than a threshold distance. The method includes determining whether an emitted beam power determinant of the automated luminaire has changed; if so, calculating a threshold distance from current values of one or more beam power determinants; determining whether the distance to the closest object is greater than the threshold distance; and, if not, reducing the beam power density of the light beam emitted from the automated luminaire.

First claim

What is claimed is:

1. An automated luminaire comprising:
a range sensing module configured to emit first light pulses in a first direction along a first axis to calculate a measured distance to a closest object in the first direction; and
a control system configured to:
receive from the range sensing module the measured distance; and
reduce an emitted beam power density of a second emitted light beam emitted from the automated luminaire along a second axis when a value of the measured distance is less than a predetermined threshold distance value, wherein the first axis and the second axis are not coaxial.

2. The automated luminaire of claim 1 , wherein the range sensing module comprises a Light Detection and Ranging (LiDAR) range sensor.

3. The automated luminaire of claim 1 , wherein the second emitted light beam is an incoherent light beam emitted by a light emitting phosphor optically pumped by a laser LED.

4. The automated luminaire of claim 1 , wherein the control system is configured to calculate the predetermined threshold distance value as a minimum distance from the luminaire at which the emitted beam power density of the second emitted light beam is below a predetermined threshold power density value.

5. The automated luminaire of claim 1 , wherein the control system is configured to calculate the predetermined threshold distance value from one or more of: (i) a configuration of a zoom lens system configured to control a beam angle of the second emitted light beam, (ii) a power applied to a light source configured to generate the second emitted light beam, and (iii) a configuration of an optical system through which the second emitted light beam passes before being emitted from the automated luminaire.

6. The automated luminaire of claim 5 , wherein the control system is configured to calculate the predetermined threshold distance value using a look up table comprising threshold distance values keyed by one or more of the zoom lens system configuration, the power applied to the light source, and the optical system configuration.

7. The automated luminaire of claim 1 , wherein the control system is configured to reduce the emitted beam power density of the second emitted light beam by altering a configuration of emitted beam power determinants to a configuration selected as causing the luminaire to emit a beam having a predetermined emitted beam power density,
wherein the emitted beam power determinants comprise one or more of: (i) a zoom lens system configured to control a beam angle of the second emitted light beam, (ii) a power applied to a light source configured to generate the second emitted light beam, and (iii) a configuration of an optical system through which the second emitted light beam passes before being emitted from the automated luminaire.

8. The automated luminaire of claim 1 , wherein the control system is configured to reduce the emitted beam power density of the second emitted light beam by physically blocking the light beam.

9. The automated luminaire of claim 1 , further comprising:
a lens position sensor in a lens mechanism of the automated luminaire, the lens position sensor configured to sense an actual lens position of the lens mechanism, wherein the lens position sensor is separate from sensors in an associated lens positioning mechanism,
wherein the control system is configured to:
determine, based on a value of the lens position sensor, whether the second emitted light beam has a beam angle commanded by the control system; and
reduce the emitted beam power density of the second emitted light beam when the second emitted light beam has a beam angle different than the beam angle commanded by the control system.

10. The automated luminaire of claim 1 , further comprising:
an orientation sensor in a luminaire head orientation mechanism of the automated luminaire, the orientation sensor configured to sense an actual current orientation of a head of the automated luminaire, wherein the orientation sensor is separate from sensors in an associated luminaire head motion mechanism,
wherein the control system is configured to:
determine, based on a value of the orientation sensor, whether the head of the automated luminaire has an orientation commanded by the control system; and
reduce the emitted beam power density of the second emitted light beam when the orientation of the head of the automated luminaire is different than the orientation commanded by the control system.

11. A range sensing module configured to:
mechanically couple to an automated luminaire configured to emit a first light beam in a first direction along a first axis;
electrically couple to a control system of the automated luminaire;
emit light pulses in the first direction along a second axis to measure a distance to an object in the first direction, wherein the first axis and the second axis are not coaxial; and
send the measured distance to the control system of the automated luminaire.

12. The range sensing module of claim 11 , wherein the range sensing module comprises a Light Detection and Ranging (LiDAR) range sensing system configured to electrically couple to the control system of the automated luminaire.

13. The range sensing module of claim 12 , wherein the LiDAR range sensing system is configured to emit light pulses and receive reflected light pulses through an aperture in the range sensing module, wherein the aperture comprises a window configured to protect the LiDAR range sensing system from airborne materials and moisture.

14. The range sensing module of claim 12 , wherein the range sensing module comprises a second LiDAR range sensing system configured to electrically couple to the control system of the automated luminaire.

15. A method of controlling an intensity of a first light beam emitted along a first axis by an automated luminaire, the method comprising:
determining whether an emitted beam power determinant of the automated luminaire has changed;
if the emitted beam power determinant has changed, calculating a threshold distance from current values of one or more beam power determinants;
calculating by a range sensing module, configured to emit light pulses in a second direction along a second axis, a measured distance to a closest object in the second direction, wherein the first axis and the second axis are not coaxial;
determining whether the measured distance is greater than the threshold distance; and
if the measured distance is not greater than the threshold distance, reducing an emitted beam power density of the first light beam.

16. The method of claim 15 , further comprising:
if the measured distance is greater than the threshold distance, determining whether both a pan position and a tilt position of the automated luminaire are in an intensity-controlled range;
if both the pan position and the tilt position are in the intensity-controlled range, reducing the emitted beam power density; and
if both the pan position and the tilt position are not in intensity-controlled ranges, permitting the emitted first light beam to return to a full emitted beam power density.

17. The method of claim 16 , wherein reducing the emitted beam power density comprises one or more of:
physically blocking the emitted first light beam;
reducing a power applied to a light source of the automated luminaire; and
increasing a beam angle of the emitted first light beam.

18. The method of claim 16 , wherein permitting the emitted first light beam to return to the full emitted beam power density comprises one or more of

Assignees

• Robe Lighting Sro

Inventors

• Stanek Michal
• Vilem Jan
• David Tomas
• Vavrik Jindrich
• Valchar Josef

Classifications

• F21V21/30

  Pivoted housings or frames · CPC title

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• G01S17/88

  Lidar systems specially adapted for specific applications · CPC title

• G01S17/10

  using transmission of interrupted, pulse-modulated waves (determination of distance by phase measurements G01S17/32) · CPC title

• F21Y2115/30

  Semiconductor lasers · CPC title