Light source having a multiply conic lens

Details Light source having a multiply conic lens Light source having a multiply conic lens

1990-07-23

1991-05-07

Arnold, Bruce Y.

Illumination

Supported by vehicle structure

Condition responsive

362326, 362800, G02B 304

Patent

active

050131443

ABSTRACT:
A lens for a light emitting diode (LED) lamp is formed as two ellipses rather than as one. The ellipses are axially symmetric and are translated away from the optical axis with each ellipse having a focus located on the LED chip away from the central bond pad so that the bond pad shadow does not decrease on-axis light intensity. In alternative embodiments, the depression located at the intersection of the two ellipses is flattened and the axes of the two ellipses are translated away from the optical axis and are also tilted.

REFERENCES:
patent: 3586813 (1971-06-01), Cruickshank
patent: 3711722 (1973-01-01), Kavanagh
"Eccentric Lenses for Producing Ring Images" by J. B. Goodell, Applied Optics, vol. 8, #12, Dec. 1969.

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