Sunlight redirector with fixed mirror segments

Patent metadata

Field	Value
Publication number	US-9746148-B2
Application number	US-201414786943-A
Country	US
Kind code	B2
Filing date	Apr 24, 2014
Priority date	Apr 24, 2013
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A sunlight redirector has a first mirror array formed of a first plurality of substantially parallel, uniformly spaced, longitudinal outward mirror segments; and a second mirror array formed of a second plurality of substantially parallel, uniformly spaced, longitudinal inward mirror segments. Each mirror segment has a normal vector. The outward mirror segments are adjustably positionable, such that their normal vectors remain parallel. The first mirror array is rotatable about a normal vector of the sunlight redirector. The inward mirror segments may remain fixed in position at all times; or they may be moved, twice per day, between first and second fixed positions.

First claim

What is claimed is:

1. A sunlight redirector, comprising:
a first mirror array comprising a first plurality of substantially parallel, uniformly spaced, longitudinal outward mirror segments;
a second mirror array comprising a second plurality of substantially parallel, uniformly spaced, longitudinal inward mirror segments; each one of the mirror segments having a normal vector;
wherein:
the outward mirror segments are adjustably positionable such that the outward mirror segments' normal vectors remain parallel; and
the first mirror array is rotatable about a normal vector of the sunlight redirector and the second mirror array is mounted to rotate about the normal vector of the sunlight redirector independently of the first mirror array.

2. A sunlight redirector as defined in claim 1 , wherein the inward mirror segments remain fixed in position.

3. A sunlight redirector as defined in claim 1 , wherein the inward mirror segments are movable between a first fixed position and a second fixed position.

4. A sunlight redirector as defined in claim 1 wherein:
the outward mirror segments are of different lengths and are arranged such that the first mirror array is circular; and
the inward mirror segments are of different lengths and are arranged such that the second mirror array is circular.

5. A sunlight redirector as defined in claim 1 wherein the mirror segments redirect incident light rays into a desired direction substantially parallel to the normal vector of the sunlight redirector.

6. A sunlight redirector as defined in claim 1 wherein the angular orientation of the inward mirror segments is selected such that light rays reflected by the outward mirror segments onto the inward mirror segments are redirected by the inward mirror segments into a desired direction substantially parallel to the normal vector of the sunlight redirector.

7. A sunlight redirector as defined in claim 1 wherein a number of the inward mirror segments in the second mirror array is larger than a number of the outward mirror segments in the first mirror array.

8. A sunlight redirector as defined in claim 7 wherein the inward mirror segments of the second mirror array are narrower than the outward mirror segments of the first mirror array.

9. A sunlight redirector as defined in claim 1 wherein the outward mirror segments of the first mirror array each comprises an inward/outward pair of mirror segments that are mirrored on both sides wherein an angle of the outward mirror segment of each outward/inward pair of mirror segments is adjustable relative to an angle of the corresponding inner mirror segment.

10. A sunlight redirection method, comprising:
providing a first mirror array comprising a first plurality of substantially parallel, uniformly spaced, longitudinal outward mirror segments, each one of the outward mirror segments having a normal vector;
providing a second mirror array comprising a second plurality of substantially parallel, uniformly spaced, longitudinal inward mirror segments, each one of the inward mirror segments having a normal vector;
tracking the sun by:
adjustably positioning the outward mirror segments while maintaining substantially parallel alignment of the outward mirror segments' normal vectors; and
rotating the first mirror array about a normal vector of the first and second mirror arrays and,
independently of the first mirror array, rotating the second mirror array about the normal vector of the first and second mirror arrays.

11. A sunlight redirection method as defined in claim 10 , further comprising maintaining an angle between the normal vectors of the inward mirror segments and the inward mirror segments in a fixed position.

12. A sunlight redirection method as defined in claim 10 , further comprising maintaining the inward mirror segments in a fixed position in which light rays reflected by the outward mirror segments onto the inward mirror segments are redirected by the inward mirror segments into a desired direction substantially parallel to the normal vector of the first and second mirror arrays.

13. A sunlight redirection method as defined in claim 10 , further comprising maintaining the inward mirror segments in either one of a first fixed position or a second fixed position.

14. A sunlight redirection method as defined in claim 10 , further comprising maintaining angular orientation of the inward mirror segments such that light rays reflected by the outward mirror segments onto the inward mirror segments are redirected by the inward mirror segments into a desired direction substantially parallel to the normal vector of the first and second mirror arrays.

15. A sunlight redirection method, comprising:
providing a first mirror array comprising a first plurality of substantially parallel, uniformly spaced, longitudinal outward mirror segments, each one of the outward mirror segments having a normal vector;
providing a second mirror array comprising a second plurality of substantially parallel, uniformly spaced, longitudinal inward mirror segments, each one of the inward mirror segments having a normal vector;
tracking the sun by:
adjustably positioning the outward mirror segments while maintaining substantially parallel alignment of the outward mirror segments' normal vectors;
rotating the first mirror array about a normal vector of the first and second mirror arrays; and

once per day at a first selected time, moving the inward mirror segments from a first fixed position into a second fixed position; and once per day at a second selected time, moving the inward mirror segments from the second fixed position into the first fixed position.

16. A sunlight redirection method as defined in claim 15 ,
wherein the first selected time is approximately 11:00 am, and
the second selected time is approximately 1:00 pm.

17. A sunlight redirection method as defined in claim 16 wherein when the inward mirror segments are in the first fixed position, light rays incident upon the outward segments are reflected onto the inward segments and further reflected by the inward segments in a desired direction substantially parallel to the normal vector of the first and second mirror arrays.

18. A sunlight redirection method as defined in claim 17 wherein when the inward mirror segments are in the second fixed position, light rays incident upon the outward segments are reflected in the desired direction by the outward segments without being further reflected by the inward segments.

19. A sunlight redirection method as defined in claim 16 wherein when the inward mirror segments are in the second fixed position, light rays incident upon the outward segments are reflected in the desired direction by the outward segments without being further reflected by the inward segments.

Assignees

• Univ British Columbia

Inventors

• Whitehead Lorne
• Upward Allen James
• Friedel Peter George
• Scott Jon David Edward

Classifications

• G02B17/006

  Systems in which light light is reflected on a plurality of parallel surfaces, e.g. louvre mirrors, total internal reflection [TIR] lenses (Fresnel mirrors G02B5/09, Fresnel lenses G02B3/08) · CPC title

• G02B19/0042

  for use with direct solar radiation · CPC title

• G02B17/002

  Arrays of reflective systems · CPC title

• F21V14/04

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

• F21V7/05

  plane · CPC title