Unmanned aerial vehicle and method for indicating a landing zone

1. An unmanned aerial vehicle comprising: a body for carrying an article; at least one rotor; and a light source for generating a light beam to define a pattern for a landing zone for the unmanned aerial vehicle, wherein the light beam has a variable cone angle, whereby the landing zone indicated by the light source remains of substantially constant area, as the unmanned aerial vehicle the descends.

2. An unmanned aerial vehicle as claimed in claim 1 , wherein the light source provides a solid beam.

3. An unmanned aerial vehicle as claimed in claim 1 , wherein the light source provides a hollow cone beam.

4. An unmanned aerial vehicle as claimed in claim 1 , 2 or 3 , wherein the landing zone defined by the light beam is one of a circle, quadrilateral and a hexagon.

5. An unmanned aerial vehicle as claimed in claim 1 , including at least one sensor to detect unwanted objects in the landing zone.

6. An unmanned aerial vehicle as claimed in claim 5 , wherein the at least one sensor comprises at least one of a downwardly facing video camera, a motion sensor directed at the landing zone and an infrared thermography sensor or camera.

7. An unmanned aerial vehicle as claimed in claim 1 , including at least one warning device for warning bystanders that the unmanned aerial vehicle will be landing.

8. An unmanned aerial vehicle as claimed in claim 7 , wherein the warning device comprises at least one of the lights and an audio source.

9. An unmanned aerial vehicle as claimed in claim 8 , wherein the audio source includes loudspeakers, for transmitting at least one of a warning sound and messages, optionally including an advisory message for bystanders to stay out of landing zone defined by the light source.

10. An unmanned aerial vehicle as claimed in claim 1 , wherein the unmanned aerial vehicle includes a plurality of rotors.

11. A method of landing an unmanned aerial vehicle at a location, the method comprising:

providing an unmanned aerial vehicle comprising: a body for carrying an article; at least one rotor; and a light source for generating a light beam to indicate the landing zone for the unmanned aerial vehicle, wherein the light beam provides a variable cone angle;

flying the unmanned aerial vehicle to a location;

causing the unmanned aerial vehicle to descend; and

while the unmanned aerial vehicle is descending operating the light source to illuminate and to define a pattern for a landing zone, whereby the landing zone indicated by the light source remains of substantially constant area, as the unmanned aerial vehicle descends.

12. A method as claimed in claim 11 , wherein the light source provides a solid beam.

13. A method as claimed in claim 11 , wherein the light source provides a hollow cone beam.

14. A method as claimed in claim 11 , wherein the light beam defines the landing zone as one of a circle, quadrilateral and a hexagon.

15. A method as claimed in claim 11 , including detecting unwanted objects in the landing zone with at least one sensor.

16. A method as claimed in claim 15 , wherein the at least one sensor comprises at least one of a downwardly facing video camera, a motion sensor directed at the landing zone and an infrared thermography sensor or camera.

17. A method as claimed in claim 11 , including at least one warning to bystanders that the unmanned aerial vehicle will be landing with a warning device.

18. A method as claimed in claim 17 , wherein the warning device comprises at least one of the lights and an audio source.

19. A method as claimed in claim 18 , including transmitting at least one of a warning sound and messages, and optionally including transmitting an advisory message advising bystanders to stay out of the landing zone defined by the light source.