Highly Efficient NIR Light Distribution for Imaging Based Intrusion Detection

摘要

An apparatus including a near infrared (NIR) light emitting diode (LED) having a predominant axis of NIR light transmission from the LED and a lens that disperses NIR light received from the LED with respect to first and second planes, the lens having an air to lens light entry boundary where light from the LED enters a surface of the lens and a lens to air boundary where light exits the lens in each of the first and second planes, the intersection forming by the second plane with the light entry surface is a line that is concave on each side of the predominant axis and where a radius of the light entry boundary of the line successively increase over each span of a predetermined number of degrees progressing outwards along the line from the predominant axis.

主权项

1. An apparatus comprising:
a near infrared (NIR) light emitting diode (LED) having a predominant axis of NIR light transmission from the LED; and a lens that disperses NIR light received from the LED with respect to first and second planes, the planes being normal to each other and intersecting along the predominant LED axis, the lens having an air to lens light entry boundary where light from the LED enters a surface of the lens and a lens to air boundary where light exits the lens in each of the first and second planes, the first and second planes intersecting with the light entry surface, the intersection forming by the second plane with the light entry surface is a line that is concave on each side of the predominant axis and where a radius of the light entry boundary of the line successively increase over each span of a predetermined number of degrees progressing outwards along the line from the predominant axis wherein the lens optimizes available NIR energy from the LED by redistributing it in a region to be protected in a high intensity and uniform manner.