Double-sided Fresnel lens

Abstract

The invention discloses a double-sided Fresnel lens, which comprises an incident surface and an emergent surface. Both the incident surface and the emergent surface are tooth grooves with multiple depressions; the corresponding tooth surface for light concentrating in each tooth groove has an arc surface structure; and the arc surface contour shape of each tooth groove at the lower part changes along with changes of the contour shape of the corresponding tooth groove at the upper part. Through double-sided structure design, the ratio of the focus of the light concentrator to a caliber of the light concentrator is compressed to 0.7; as the tooth surface in each tooth groove adopts an arc surface structure, a tooth distance can be selected randomly, a small light spot can be acquired, and that is, high light concentrating times can be met while a larger tooth distance is used for improving light effects.

Description

technical field [0001] The invention belongs to the technical field of solar energy utilization, in particular to a double-sided Fresnel lens. Background technique [0002] The current Fresnel lenses are all single-sided structures, that is, the incident surface is a planar structure, and the outgoing surface is a multi-sink alveolar structure. This structure design makes the thickness of the light-condensing component relatively thick. The caliber ratio (F / #) is usually 1.1, and the tooth surfaces in the tooth grooves of the existing Fresnel lenses are all set as planes, so the Fresnel lens itself must be very thin, that is, the tooth spacing is extremely small, usually It is required to be below 0.5mm. If the tooth spacing is too large, the spot size will be too large. However, due to the process, each tooth tip and tooth bottom, that is, the segment of each tooth surface, will form a rounded corner, and there will be light loss in the rounded part, and the smaller the to...

AI Technical Summary

Problems solved by technology

[0002] The current Fresnel lenses are all single-sided structures, that is, the incident surface is a planar structure, and the outgoing surface is a multi-sink alveolar structure. This structure design makes the thickness of the light-condensing component relatively thick. The caliber ratio (F / #) is usually 1.1, and the tooth surfaces in the tooth grooves of the existing Fresnel lenses are all set as planes, so the Fresnel lens itself must be very thin, that is, the tooth spacing is extremely small, usually It is required to be less than 0.5mm. If the tooth spacing is too large, the spot size will be too large

However, due to the process, each tooth tip and tooth bottom, that is, the segment of each tooth surface, will form a rounded corner, and there will be light loss in the rounded part, and the smaller the tooth, the more light will be lost. The greater the efficiency loss

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