| 摘要 |
<p>A transparent Fresnel plate consisting of a number of prisms each of a fine ridge shape having an oblique surface, arranged parallel to each other on the surface is used to convert the width and direction of a beam of light. Solar light projected onto the surface of the Fresnel plate with the ridges is reflected from the oblique surfaces and is reduced in width and reflected from the incident light direction toward the reflected direction. A reflecting device to re-reflect the reflected light to a predetermined position, or a reflected light energy collecting device, is provided in the path of the reflected light. The Fresnel plate can also be used to introduce solar light into a housing. In this case, solar light rays having a narrow width are converted into light rays having a wide width. The Fresnel plate can also be used as a blinker or a reflecting mirror for special purposes.</p> |
