2007, Volume 9, Issue 3
Strategic Study of CAE >> 2007, Volume 9, Issue 3
Lamp With Uniform Illuminance Within Large Angle Area
1. Department of Electronic Engineering, Southeast University, Nanjing 210096, China ;
2. East China Electronic Group, Co., Nanjing 210028, China
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Abstract
To get a natural view of an object by lamp in the dark environment, the lamp should produce a uniform illuminance in a large view angle, as the sunshine does. But illuminance produced by a lamp reaches its maximum value in the right front and decreases rapidly sideways. Then a mirror is required to produce an illuminance that increases sideways, compensating the sideway illuminance. A torus illuminant is used for symmetry. To produce a peak illuminance on the edge area where illuminance drops most, the equation that expresses the wanted mirror is given. By numeric calculation and function-fit, a cap sphere is chosen as the mirror. When a cone mirror is added to the bottom of the cap sphere, the illuminance uniformity can be even improved. The warp within 90° view angle is ±15% after design compared with 65% before design.
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