Optical arrangement, lighting system and illumination method
An optical arrangement for illuminating a region within a space comprises a reflector array and lens array having adjustable relative displacement. Each lens of the lens array is arranged to receive light from a first location within the space and to direct it onto one of the reflectors of the reflector array. Each lens is further configured to receive light reflected back from the reflector array and redirect it toward a second location within the space. By adjusting the relative displacement between the two arrays, the position of the second location can be configured.
1. An optical arrangement for illuminating a region in a space, comprising:
a lens array comprising a plurality of lenses;
a reflector array comprising a plurality of reflector elements;
wherein each lens is arranged to direct light originating from a light source at a first location within said space onto one of said reflector elements, and each reflector element is arranged to reflect received light back onto the same lens from which it was received for redirection toward a different second location within said space,
wherein at least one of the lens array and the reflector array has an adjustable position so as to configure said second location,
wherein each of the plurality of reflector elements has a first surface portion and a second surface portion arranged such that light incident on the first surface portion from one of the lenses is reflected towards the second surface portion, with the second surface portion arranged to reflect the light received from the first surface portion towards said same lens from which the first surface portion received the light, and/or
wherein one or more of the reflector elements is adapted to reflect incident light in a direction parallel but non-coincident with a direction of incidence.
2. An optical arrangement as claimed in claim 1 , wherein a pitch of the lens array is equal to a pitch of the reflector array.
3. An optical arrangement as claimed in claim 1 , wherein each of the plurality of lenses is adapted to converge received light toward one of the reflector elements.
4. An optical arrangement as claimed in claim 1 , wherein each of the lens array and the reflector array has an adjustable position, and wherein each is adjustable by means of movement in a respectively different direction.
5. An optical arrangement as claimed in claim 4 , wherein the lens array describes a plane, and wherein the lens array and reflector array are each adjustable in a different orthogonal direction parallel with said plane.
6. An optical arrangement as claimed in claim 1 , wherein the lens array describes a plane, and wherein one of the lens array and reflector array is adjustable in a direction perpendicular to said plane.
7. An optical arrangement as claimed in claim 1 , wherein the lens array is an integrally formed optical body.
8. An optical arrangement as claimed in claim 1 , wherein the reflector elements are corner reflectors; and/or
wherein the reflector array is an integrally formed body and comprises at least one of: a metallic mirror, a dielectric mirror, and a total internal reflection-based mirror.
9. An optical arrangement as claimed in claim 1 , further comprising a motor mechanism for driving adjustment of the position of at least one of the lens array and the reflector array.
10. An optical arrangement as claimed in claim 9 , wherein the arrangement comprises a power harvesting unit for providing electrical power to said motor mechanism.
11. An optical arrangement as claimed in claim 9 , wherein the arrangement comprises an interface unit operatively coupled with said motor mechanism for receiving control commands for configuring adjustment of the lens array and/or the reflector array.
12. A lighting system for illuminating a region in a space, comprising:
a luminaire to be positioned at a first location within the space, adapted to generate a light output; and
an optical arrangement as claimed in claim 1 , to be positioned remotely from the luminaire, and arranged to receive said light output and to redirect it toward a second location within the space.
13. A lighting system as claimed in claim 12 wherein the luminaire comprises a zoom lens for adjusting a focus of the luminous output.
14. A method of providing illumination to a region within a space, comprising:
directing light from a first location within the space toward a remotely positioned optical arrangement, the arrangement comprising:
a lens array comprising a plurality of lenses;
a reflector array comprising a plurality of reflector elements;
wherein each lens is arranged to direct light received from the first location within said space onto one of said reflector elements, and each reflector element is arranged to reflect received light back onto the same lens from which it was received for re-direction toward a second different location within said space,
wherein at least one of the lens array and the reflector array has an adjustable position,
wherein each of the plurality of reflector elements has a first surface portion and a second surface portion arranged such that light incident on the first surface portion from one of the lenses is reflected towards the second surface portion, with the second surface portion arranged to reflect the light received from the first surface portion towards said same lens from which the first surface portion received the light, and/or
wherein one or more of the reflector elements is adapted to reflect incident light in a direction parallel but non-coincident with a direction of incidence;
and the method further comprising:
adjusting the position of the at least one of the lens array and the reflector array so as to configure said second location.