| 摘要 |
An LED illumination lens can guide light from light emitting diodes (LEDs). The incident surface and transmission surface of the lens are a part of an elliptical shape. The present invention makes an optical lens which provides that light is refracted twice by the LED illumination lens, and the output light is more uniform and present a long elliptical output light. The curve surface of the transmission surface is selected from elliptical surfaces, rectangular surfaces, square shape surfaces, round surfaces and rectangular surfaces with a cut corner, and polygonal surfaces. An LED illumination lens serves to refract the light beam from the LED by the incident surface and then disperse by the transmission surface 12 into a slender and long elliptical light beam.
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