Light emitting diode

Details Light emitting diode Light emitting diode

1979-12-18

1981-11-17

Edlow, Martin H.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

357 18, 357 72, 250552, H01L 3300

Patent

active

043014615

ABSTRACT:
A light emitting diode (LED) having excellent directivity, which is provided with a light emitting surface formed by a PN-junction of a semiconductor body, and a dome of a transparent material formed on the light emitting surface. The external surface of the dome is made a light emitting window. This external surface is in a semi-spherical shape at least in its one part, and the light emitting surface is on the symmetrical axis of the semi-spherical surface. Further, the light emitting surface is disposed at a position displaced for a finite distance in the direction opposite to the light emitting direction with respect to the center of curvature of the semi-spherical surface. With such construction of the LED, light from the light emitting surface intensifies its directivity at the time of its emission from the external surface of the dome.

REFERENCES:
patent: 3764862 (1973-10-01), Jankowski
patent: 3805347 (1974-04-01), Collins
patent: 3834883 (1974-09-01), Klein
patent: 3954534 (1976-05-01), Scifrea
patent: 4003074 (1977-01-01), Yonezu
patent: 4009394 (1977-02-01), Mierzwinski
patent: 4017881 (1977-04-01), Ono

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