Light emitting diode device
First Claim
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1. An LED device for illuminating an area having a rectangular shape, said device comprising:
- an LED chip for emitting light, said chip having a junction center and a junction plane;
a horn having a bottom surface and an inner surface for reflecting a portion of the light emitted from said chip, the inner surface having a generally quadrilateral cross section parallel to the bottom surface of the horna lens disposed above said horn, said lens having a generally ellipsoidal upper surface.
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Abstract
An rectangularly shaped illumination area utilizing an LED device having a high utilization efficiency in light flux and having an economical manufacturing cost is attained. Herein a light flux emitted from an LED chip 1 and then reflected by reflective surfaces of a horn 11 toward a lens 12 is concentrated into corner FIGS. 14 located in diagonal directions of the rectangular shape 4 while another light flux emitted from the LED chip 1 and directly incident to the lens 12 is focused by the lens on an area having an elliptic FIG. 13, which is inscribed in the rectangle area 4.
77 Citations
9 Claims
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1. An LED device for illuminating an area having a rectangular shape, said device comprising:
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an LED chip for emitting light, said chip having a junction center and a junction plane; a horn having a bottom surface and an inner surface for reflecting a portion of the light emitted from said chip, the inner surface having a generally quadrilateral cross section parallel to the bottom surface of the horn a lens disposed above said horn, said lens having a generally ellipsoidal upper surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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8. The LED device according to claim 1, wherein said inner surface of said horn comprises four surfaces.
- 9. The LED device according to claim 7, wherein said junction plane is disposed in a Y-Z plane of a coordinate system and said junction center is disposed on the origin of the coordinate system, the coordinate system further having an X axis extending upwardly from the origin, said inner surface of said horn comprising of four surfaces one said surface being defined by the following set of equations, ##EQU2## wherein u and v AX(i), AY(i), and AZ(i) are constants as tabulated in the following table
- space="preserve" listing-type="tabular">______________________________________ i AX (i) AY (i) AZ (i) ______________________________________ 1 0.49 0.94 0 2 -0.6 -0.434 0 3 0 -0.571 0.545 4 0 0.381 -0.125 5 0 -0.018 -0.019 6 0 -0.095 -0.040 7 0 0.084 0.091 8 0 -0.088 -0.096 9 0 -0.098 -0.108 10 0 0.119 0.089 11 0 0.025 0.027 12 0 -0.033 -0.019. ______________________________________
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Specification