LIGHTING FIXTURE

To provide a lighting fixture which performs lighting in a desired region by an optical step arranged at a lens, and is enabled in lighting at homogeneous luminosity.SOLUTION: A lighting fixture comprises a light source 31, and a lens 4 for emitting light emitted from the light source 31 as illumina...

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1. Verfasser: TSUKAMOTO MICHIO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:To provide a lighting fixture which performs lighting in a desired region by an optical step arranged at a lens, and is enabled in lighting at homogeneous luminosity.SOLUTION: A lighting fixture comprises a light source 31, and a lens 4 for emitting light emitted from the light source 31 as illumination light. The lens 4 comprises an optical divergence step 51 for diverging light as an optical step. In the optical divergence step 51, a plurality of unit steps 52 are arranged in a lattice shape, and in each of the unit steps 52, a light incident face 521 is constituted of a non-circular arc recessed cylinder face which is formed on the basis of a plurality of circular arcs which are different in curvature radii. The light incident face 521 of the non-circular arc recessed cylinder face is constituted so that a curvature radius of a center part in an alignment direction is smaller than curvature radii of its both-side parts.SELECTED DRAWING: Figure 5 【課題】レンズに設けた光学的なステップにより所要の領域の照明を行うとともに、均一な明るさでの照明を可能にした照明用灯具を提供する。【解決手段】光源31と、光源31から出射された光を透過して照明光として出射するレンズ4を備えている。レンズ4は光学的なステップとして、光を発散させる光発散ステップ51を備えている。光発散ステップ51は複数の単位ステップ52が格子状に配列されており、各単位ステップ52は光入射面521が曲率半径の異なる複数の円弧に基づいて形成された非円弧凹筒面で構成される。この非円弧凹筒面の入射面521は配列方向の中央部の曲率半径がその両側部の曲率半径よりも小さい構成とされる。【選択図】 図5