OPTICAL MEMBER, LIGHT SOURCE DEVICE AND IRRADIATION SYSTEM

PROBLEM TO BE SOLVED: To provide an optical member that can obtain a rectangular irradiation area of uniform illuminance on an irradiated surface obliquely arranged with respect to an optical axis of emission light when irradiating the irradiated surface with light, and to provide a light source device that is equipped with the optical member, as well as to provide an irradiation system that is equipped with the light source device.SOLUTION: An optical member is equipped with at least one almost rectangular lens surface 2 that has a curve surface having a curvature in a first direction (an X-axis) and a second direction (a Y-axis) orthogonal to each other on a virtual plane surface orthogonal to an optical axis (a Z-axis) of incidence light, and has, when viewing from an optical axis direction, a plane surface shape surrounded with almost parallel two sides in the first direction and almost parallel two sides in the second direction, in which the curvature in the second direction becomes continuously larger from one end part 4 in the first direction of the lens surface 2 toward the other end part 6 therein. A light source device is provided that is equipped with the optical member, and an irradiation system is provided that is equipped with the light source device.SELECTED DRAWING: Figure 2 【課題】出射光の光軸に対して斜めに配置された被照射面に光を照射する場合に、被照射面に長方形の均一な照度の照射領域を得ることができる光学部材、この光学部材を備えた光源装置及びこの光源装置を備えた照射システムを提供する。【解決手段】 入射光の光軸（Z軸）に直交する仮想平面上の互いに直交する第１の方向（X軸）及び第２の方向（Y軸）に曲率を有する曲面を有し、光軸方向から見た平面形状が、第１の方向に略平行な２つの辺及び第２の方向に略平行な２つの辺で囲まれた略長方形のレンズ面２を少なくとも１つ備え、レンズ面２の第１の方向の一方の端部４から他方の端部６へ向かって、第２の方向における曲率が連続的に大きくなる光学部材、この光学部材を備えた光源装置及びこの光源装置を備えた照射システムを提供する。【選択図】 図２