VEHICULAR LIGHTING FIXTURE

• Main Authors: FUJII YUSUKE, NIIKURA EIJI, INOUE YOKO
• Format: Patent
• Language: English; Japanese
• Published: 17.10.2019
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To suppress variation in a light irradiation direction even in a lighting fixture using a light guide having a curved emission surface of light.SOLUTION: A lighting fixture (1) includes: a light source (30); and light guide members (10, 20). The light guide member (20) has a plurality of reflection surfaces (21), makes light incident from an incidence surface (22) and guides the light by total reflection, makes light beam reflected on a reflection surface (21) into light beam having an incidence angle smaller than a critical angle, and emits the light beam from a side face (24). A surface perpendicular to an emission direction is defined as a projection surface and a center line (C) is curved on the projection surface. A position in a long-axis direction from the incidence surface (22) of the side face (24) in which light beam reflected on the reflection surface 21 is emitted is positioned to be far from the reflected reflection surface (21). A plane (S) including a normal line (N) in a minute region including a point (P) on the center line (C) and light beam (L) which passes the point (P) and is emitted from an emission surface (11) coincides with a tangent line of the center line (C) at the point (P) on the projection surface.SELECTED DRAWING: Figure 1 【課題】 光の出射面が曲面の導光体を用いた灯具でも光の照射方向のばらつきを抑制できる。【解決手段】 灯具（１）は光源（３０）及び導光部材（１０，２０）を備える。導光部材（２０）は複数の反射面（２１）を含み、光を入射面（２２）から入射して全反射によって導光し、反射面（２１）で反射された光線を入射角が臨界角よりも小さい光線として側面（２４）から出射する。出射方向に垂直な面を投影面とし、中心線（Ｃ２）は投影面上で湾曲している。反射面（２１）で反射された光線が出射される側面（２４）の入射面（２２）からの長軸方向の位置は、反射された反射面（２１）よりも遠くに位置する。中心線（Ｃ２）上の点（Ｐ１）を含む微小領域の法線（Ｎ２）と点（Ｐ１）を通り出射面（１１）から出射される光線（Ｌ５）とを含む平面（Ｓ）は投影面上において点（Ｐ１）における中心線（Ｃ２）の接線と一致する。【選択図】 図１