Retroreflector
AssigneeNEC Corporation Of America
InventorsTsvi Lev, Hagai Har-Gil
Life of this patent
Estimating the term…
Abstract
There is provided a retroreflector device, comprising: an incident object made of a material transparent to electromagnetic radiation, the incident object designed to refract an incident ray hitting an incident surface to generate a refracted ray that hits a back surface, and a retroreflective surface positioned in proximity to the back surface of the incident object, wherein the retroreflective surface and the incident object are configured to refract the incident ray to generate the refracted ray for hitting the retroreflective surface at an angle of incidence below a threshold.
Claims21
A retroreflector device, comprising:
- an incident object made of a material transparent to electromagnetic radiation, the incident object designed to refract an incident ray hitting an incident surface to generate a refracted ray that hits a back surface;
- and
- a retroreflective surface positioned in proximity to the back surface of the incident object;
- wherein the retroreflective surface and the incident object are configured to refract the incident ray to generate the refracted ray for hitting the retroreflective surface at an angle of incidence below a threshold;
- wherein the electromagnetic radiation comprises short wave infrared (SWIR), and wherein the incident surface is positioned behind a barrier made out of a material selected for being opaque to visible light and non-opaque to SWIR.
A retroreflector device, comprising:
- a substrate comprising a binding surface;
- and
- at least one retroreflective surface positioned at an angle relative to the binding surface of the substrate;
- and a coating that is substantially opaque to electromagnetic energy in the visible range and substantially transparent to electromagnetic energy in the near infrared range;
- wherein the angle is selected for an incident ray to hit the at least one retroreflective surface at an angle of incidence below a threshold in which the at least one retroreflective surface generates a reflected ray back towards the source that generated the incident ray, when an angle between the incident ray and a normal of the binding surface is above the threshold.
Dependencies are inferred from the claim text.