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Honeycomb array Fresnel lens for LED lights
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Honeycomb array Fresnel lens for LED lights

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[Abstract]:
Lightpassesthroughthelensandconvergesatthefocalplane.Toformapatternatthefocalplane,multiplefocalpointsareneeded,thatis,multiplelensesarerequiredtoformanarray.Intheory,themorethenumberoflenses,themoret

Light passes through the lens and converges at the focal plane. To form a pattern at the focal plane, multiple focal points are needed, that is, multiple lenses are required to form an array. In theory, the more the number of lenses, the more the number of focal points obtained, the more complex the graphics can be formed. In order to make the arrangement of the entire lens array compact and improve the light utilization efficiency, the lens is arranged in a honeycomb manner during design. Create a unit number (m, n), where m is the number of layers and n is the ordinal number. The lenses at the center of the array are numbered, numbered (0, 1), and then one circle around them is numbered, and the lens unit directly above is numbered counterclockwise (1, 1), (1, 2) ), (1, 3), (1, 4) ... number the lenses of each outer ring in the same way. This is the model and entity map of the lens array.

Arranged by a plurality of identical lens entities in a honeycomb shape. If the radius of a single lens is r, in order to make the lens cover the plane and minimize the overlap between the lenses, the adjacent two Fresnel lenses The distance between them should be r. The original lens array is formed in a honeycomb arrangement, in which case the lens array has the effect of concentrating light, but is not sufficient to form a specific pattern. The focus of each Fresnel lens array is on the optical axis of its lens, so that when the parallel light is incident on the lens array, the respective focus arrangements on the receiving surface are also honeycomb-shaped. In order to enable the lens array to deflect the light in a specific direction and focus the focus to a specific position, the plane side of each Fresnel lens is now cut to form a slope so that the light is deflected off-axis.
A light distribution design method using monochromatic parallel light as a light source to redistribute light with a honeycomb Fresnel lens array. A deflection factor is added to the lens having concentrating properties so that the light can be deflected within a certain angle to obtain a specific image on the receiving surface. It is optically simulated in the Fresnel lens design software independently developed by Yuying, and the projection pattern is obtained. Subsequently, an array of Fresnel lenses with a higher order of magnitude will be developed. Each lens unit is equivalent to one pixel point in Shandong. Under the existing integrated optical manufacturing process of Yuying, fine lens fabrication can be realized, and the number of rings of a single lens is taken into consideration, and a light distribution lens with good graphic quality and high luminous efficiency can be obtained.