Back to results
US 8,274,220 B2Granted
LED source with hollow collection lens
Assignee3M Innovative Properties Company
InventorsPatrick R. Destain, Stephen J. Willett
Life of this patent
Estimating the term…
Abstract
A light source, includes an LED emitter and a meniscus lens having a hollow cavity in which the LED emitter is disposed. The meniscus lens is in exemplary embodiments hyperhemispheric, and it produces a high quality optical image of the LED emitter. The cavity of the lens is filled with air, such as terrestrial atmosphere, inert gas, or vacuum.
Claims20
A light source comprising:
- an LED emitter having a width 2h;
- and
- a meniscus lens having a hollow cavity;
- wherein the LED emitter is disposed in the cavity, and;
- wherein light is produced by the LED emitter, refracted by the meniscus lens and forms a first and second virtual image of the LED emitter, the second virtual image being disposed on the side of the LED emitter opposite the meniscus lens, and the first virtual image disposed between the LED emitter and the second virtual image, the second virtual image having a width 2h2, wherein h2/h is between 3 and 4.
2 more elements
A light source comprising:
- an LED emitter;
- and
- a meniscus lens having a hollow cavity and having an outer surface characterized by a radius of curvature R;
- wherein the LED emitter is disposed in the cavity, and;
- wherein light is produced by the LED emitter, refracted by the meniscus lens and forms a first and second virtual image of the LED emitter, the second virtual image being disposed on the side of the LED emitter opposite the meniscus lens and the first virtual image disposed between the LED emitter and the second virtual image, the second virtual image having a width 2h2, wherein 2h2 is greater than R and less than 4 R.
2 more elements
Dependencies are inferred from the claim text.