Lighting device

Patent metadata

Field	Value
Publication number	US-10054288-B2
Application number	US-201615366585-A
Country	US
Kind code	B2
Filing date	Dec 1, 2016
Priority date	Dec 4, 2015
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

A lighting device includes a baffle extending about an optical axis to surround a light source, and a reflector module connected to the baffle. The reflector module includes a main reflector having a light exit opening from which a light output of the lighting device is projected towards a target area, the optical axis passing through the opening, and reflective surfaces adjacent to the opening for reflecting light incident thereon away from the opening. The reflector module further includes auxiliary reflectors for adjusting the shape of the light output of the lighting device. Each auxiliary reflector has a reflective surface, and is moveable relative to the main reflector between a stowed position and a deployed position in which at least part of the reflective surface of the auxiliary reflector is exposed, by the opening of the main reflector, to reflect light incident thereon away from the target area.

First claim

The invention claimed is:

1. A lighting device comprising:
a light source disposed on an optical axis;
a baffle extending about the optical axis and surrounding the light source; and
a reflector module connected to the baffle, the reflector module comprising:
a main reflector having a light exit opening from which a light output of the lighting device is projected towards a target area, the optical axis passing through the opening, and a plurality of reflective surfaces adjacent to the opening for reflecting light incident thereon away from the opening and at an angle to the optical axis; and
a plurality of auxiliary reflectors for adjusting the shape of the light output of the lighting device, each auxiliary reflector comprising a reflective surface, each auxiliary reflector being moveable relative to the main reflector between a stowed position and a deployed position in which at least part of the reflective surface of the auxiliary reflector is exposed, by the opening of the main reflector, to reflect light incident thereon away from the target area.

2. The lighting device of claim 1 , wherein each auxiliary reflector is slidable relative to the main reflector.

3. The lighting device of claim 1 , wherein each auxiliary reflector is moveable relative to the main reflector along a linear path.

4. The lighting device of claim 3 , wherein each linear path is angled to the optical axis.

5. The lighting device of claim 1 , wherein each auxiliary reflector is, when in its stowed position, shielded by the main reflector from the light generated by the light source.

6. The lighting device of claim 1 , wherein each of the auxiliary reflectors is moveable independently relative to the main reflector.

7. The lighting device of claim 1 , wherein said at least part of the reflective surface of the auxiliary reflector is, when in the deployed position, parallel to an adjoining reflective surface of the main reflector.

8. The lighting device of claim 1 , wherein the plurality of auxiliary reflectors comprises a pair of first auxiliary reflectors which approach one another with movement thereof towards their deployed positions, and a pair of second auxiliary reflectors which approach one another with movement thereof towards their deployed positions, the first auxiliary reflectors and the second auxiliary reflectors being disposed alternately about the optical axis.

9. The lighting device of claim 8 , wherein the first auxiliary reflectors have a shape which is different from that of the second auxiliary reflectors.

10. The lighting device of claim 8 , wherein each of the first auxiliary reflectors comprises a planar reflective surface.

11. The lighting device of claim 10 , wherein the reflective surfaces of the first auxiliary reflectors are non-coplanar.

12. The lighting device of claim 8 , wherein the reflective surface of each of the first auxiliary reflectors is inclined relative to a plane which is normal to the optical axis of the opening.

13. The lighting device of claim 12 , wherein the reflective surface of each of the first auxiliary reflectors is inclined relative to said plane at an angle in the range from 5 to 30°.

14. The lighting device of claim 8 , wherein each of the second auxiliary reflectors comprises a plurality of non-coplanar reflective surfaces.

15. The lighting device of claim 14 , wherein the reflective surfaces of each of the second auxiliary reflectors are inclined relative to a plane which is normal to the optical axis of the opening.

16. The lighting device of claim 14 , wherein each reflective surface of the second auxiliary reflectors is parallel to a reflective surface of an adjacent first auxiliary reflector.

17. The lighting device of claim 8 , wherein, when the auxiliary reflectors are in their deployed positions, at least a portion of each of the second auxiliary reflectors is disposed between the main reflector and one of the first auxiliary reflectors.

18. The lighting device of claim 17 , wherein a first portion of each of the second auxiliary reflectors is disposed between the main reflector and a first one of the first auxiliary reflectors, and a second portion of each of the second auxiliary reflectors is disposed between the main reflector and a second one of the first auxiliary reflectors.

19. The lighting device of claim 8 , wherein each of the first auxiliary reflectors is moveable relative to the main reflector in a direction which intersects the optical axis at a first angle, and each of the second auxiliary reflectors is moveable relative to the main reflector in a direction which intersects the optical axis at a second angle, and wherein the first angle is different from the second angle.

20. The lighting device of claim 19 , wherein the second angle is 90°.

21. The lighting device of claim 1 , wherein the baffle comprises a first end proximate to the light source, and a second end remote from the light source, and wherein the main reflector is connected to the second end of the baffle.

22. The lighting device of claim 1 , wherein each of the reflective surfaces of the main reflector which are adjacent to the opening is a planar reflector which faces away from the optical axis.

23. The lighting device of claim 1 , wherein the main reflector comprises a plurality of peripheral surfaces arranged about, and angled relative to, the reflective surfaces adjacent to the opening.

24. The lighting device of claim 23 , wherein each of the peripheral surfaces faces towards the optical axis.

25. The lighting device of claim 23 , wherein each of the peripheral surfaces comprises a reflective surface.

Assignees

• Dyson Technology Ltd

Inventors

• Dyson Jacob
• Whittaker Paul Dominic
• Darvill William John

Classifications

• F21V11/186

  slidable · CPC title

• F21V7/18

  with provision for folding or collapsing · CPC title

• F21V14/04

  by movement of reflectors {(in vehicle head lamps F21S41/675)} · CPC title

• F21V7/0033

  with successive reflections from one reflector to the next or following · CPC title

• F21V11/183

  pivotable · CPC title