Importance

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Abstract

A natural lighting device is capable of controlling an angle of diffusion of sunlight reflected to a shaded area to form reflected light whose size and shape are suitable for a window of a household. The natural lighting device is installed in the vicinity of a building having a shaded area formed thereon to radiate sunlight toward a household located in the shaded area and includes a primary reflector configured to reflect sunlight incident thereon; and a secondary reflector configured to reflect the reflected light, which is reflected from the primary reflector, incident thereon, wherein the secondary reflector includes a secondary reflecting mirror having a curvature about an axis in a direction that intersects with the ground or an axis in a direction that is horizontal to the ground so that the reflected sunlight is not diffused in a horizontal direction or naturally diffused in a vertical direction.

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First Claim