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Design method for glass Fresnel lens mould

A technology of Fresnel lens and design method, which is applied in the field of manufacturing, and can solve the problems of affecting the rolling effect and different temperatures

Inactive Publication Date: 2012-07-18
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lowest-cost calendering method is required to uniformly cool the mold roll through flowing water in the process of producing Fresnel lenses, but because the outer wall of the mold roll designed and manufactured by this method is different in temperature after cooling due to the difference in the height of the teeth of the Fresnel lens Seriously affect the calendering effect

Method used

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  • Design method for glass Fresnel lens mould
  • Design method for glass Fresnel lens mould
  • Design method for glass Fresnel lens mould

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Embodiment Construction

[0041] see figure 2 , the present invention divides the Fresnel lens mold into two parts A and B according to the distance from the optical axis, wherein the A part is the part close to the center of the Fresnel lens mold, the B part is the edge part of the Fresnel lens mold, and the A part On the basis of adopting the ordinary Fresnel lens mold design method, the tooth width and tooth angle are kept constant, and the height of the tooth is raised in turn to make the height of the tooth consistent, so that the thickness of the tooth profile is uniform, The rib teeth of part B adopt the design method of equal tooth height, that is, the height of the rib teeth is constant, and the width of the rib teeth is different; the specific design process is as follows (see image 3 ):

[0042] Suppose the width of the Fresnel lens mold is 2l, the focal length is f, and the spot width of the spotlight is k0 , the expected height allowed by the tooth is d 0 , starting from the main optic...

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Abstract

A design method for a glass Fresnel lens mould is characterized in that the conformity of contour line heights of edge teeth are ensured through changing widths or heights of the edge teeth having different distances to a center of the glass Fresnel lens mould, that is, the heights of the edge teeth closed to the center and close to edges of the glass Fresnel lens mould are basically same, so that the thicknesses of outer wall contour lines of the glass Fresnel lens mould represent the basically uniform state, that is, the uniformity of outer wall contour line thicknesses of the glass Fresnel lens mould are basically ensured. Therefore, necessary conditions are provided for the smooth realization of running water cooling of the mould and the technological requirement for uniform glass stress distribution.

Description

technical field [0001] The invention belongs to the field of manufacturing, and in particular relates to a design method of a glass Fresnel lens mold. Background technique [0002] The use of Fresnel lenses for solar energy concentration has the advantages of small size, light weight, and easy processing; and because the sun and light-receiving bodies are on both sides of the lens, it provides convenience for making products. The material used for Fresnel lenses is generally PMMA (organic glass), but PMMA has a short lifespan. When used for solar energy concentration, it is easy to age under the irradiation of ultraviolet rays, and glass Fresnel lenses can overcome this shortcoming very well. [0003] When using glass to make Fresnel lenses, considering the important requirements of the market to reduce production costs, the method of calendering and molding has become the best choice. However, in the Fresnel lens usually designed and manufactured by the equal-tooth pitch m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08
Inventor 宁铎张剑莉付玉生陈晓戴庆瑜李斌
Owner SHAANXI UNIV OF SCI & TECH
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