Freeform Surface Lens Design for Uniform Illumination with Square Spot
Zhang Kang
Su Chengyue
Wang Weijiang
Abstract：According to the principle of the edge-ray and using the method of dividing grid , a lens was designed to obtained the uniform square spot light distribution .Research results show that it applies to point source , and at the same time can also be applied to extended source .When the ratio of the lens height and size of LED source is 10∶1 and 5∶1, it equivalent to a point source , the uniformity of illuminance on the target surface is as high as 90%, the efficiency of system is 88%.When the ratio of the lens height and size of LED source is 10∶3, 2.5∶1 and 2∶1, it quivalent to an extended source , uniformity of illuminance on the target surface is more than 80%, at a higher level , and the efficiency of system is about 88%.The lens can maintain a higher efficiency and uniformity for extended source .It's suitable for projection display and indoor and outdoor lighting and has a broad application prospect .
Keywords：grid partition methodfreeform surfacelensuniform illumination
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 82-88 )