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1. (WO2019030607) LIGHTGUIDE HAVING OPENING AND SURROUNDING CHANNEL
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CLAIMS:

1. An optical system, comprising:

a lightguide comprising:

opposing top and bottom major surfaces;

a round through opening extending from the top major surface to the bottom major surface; an elongated first channel formed in one of the top and bottom major surfaces and at least partially surrounding and substantially concentric with the opening, the first channel having a depth (d) that varies along a length of the first channel; and

a plurality of light extractors for extracting light that would otherwise propagate within and along the lightguide.

2. The optical system of claim 1, further comprising an optical fiber for injecting light into a region of the lightguide between the first opening and the elongated first channel, wherein a first end of the optical fiber is disposed at an edge of the lightguide proximate a first end of the elongated first channel.

3. The optical system of claim 1, wherein the elongated first channel is formed in the top major surface and extends toward the bottom major surface, and wherein at at least one location along the length of the elongated first channel, the elongated first channel reaches the bottom major surface.

4. A lightguide comprising substantially coextensive spaced apart first and second elongated channels, each elongated channel extending from a first end of the elongated channel proximate a same first edge of the lightguide to an opposing second end of the elongated channel proximate a same second edge of the lightguide, wherein at least one of the first and second elongated channels has a maximum depth (hi, h2) that is at least 0.5 times a thickness of the lightguide.

5. The lightguide of claim 4, wherein at least one end in the first and second ends of at least one of the first and second elongated channels is closed.

6. The lightguide of claim 4, wherein neither of the first and second elongated channels extends from the first edge to the second edge.

7. The lightguide of claim 4, wherein the pair of the first and second elongated channels define a first region of the lightguide between the first and second elongated channels and a second region of the lightguide on at least one side of the pair of the first and second elongated channels, such that when a light source is disposed at one of the first and second edges between the first and second elongated channels, light emitted by the light source enters the first region from the one of the first and second edges, at least a first portion of the entered light propagating toward the other one of the first and second edges by undergoing at least partial reflection at at least one of the first and second elongated channels, and at least a second portion of the entered light propagating from the first region to the second region by crossing underneath or above one of the first and second elongated channels.

8. An optical system, comprising:

the lightguide of claim 4, wherein the first and second elongated channels define a first region of the lightguide therebetween; and

a light source disposed at at least one of the first and second edges between the first and second elongated channels, such that light emitted by the light source enters the first region of the lightguide and propagates along the first region by undergoing at least partial reflection at the first and second elongated channels.

9. The optical system of claim 8, wherein a light source is disposed at each of the first and second edges between the first and second elongated channels, such that light emitted by each light source enters the first region of the lightguide and propagates along the first region by undergoing reflection at the first and second elongated channels.

10. The lightguide of claim 8, wherein the lightguide is a unitary lightguide.