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US 9,176,474 B2Granted
Light-concentrating film, method for producing same, focusing element, solar cell, and focusing method
AssigneeDaikin Industries, Ltd.
InventorsKazuyuki Satoh, Hidenori Ozaki, Takayuki Araki
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Abstract
The present invention provides a focusing method and a light-concentrating film capable of concentrating incident light in a wide angular range with high efficiency, a focusing element including the light-concentrating film, and a solar cell. The present invention is alight-concentrating film that is made of an organic material, and is characterized by having a multilevel gradation pattern.
Claims14
A light-concentrating film, which is a transmission type light-concentrating film made of an organic material,
- the light-concentrating film having a multilevel gradation pattern,
- wherein the ratio dmin/dmax of the minimum thickness dmin relative to the maximum thickness dmax is less than or equal to 25% in a region having the multilevel gradation pattern.
Dependencies are inferred from the claim text.