| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of making illuminance of irradiation surface even, without using reflector, lens or the like.SOLUTION: When an angle between the perpendicular elongated so as to pass through a standard position from an irradiation surface and an optical axis direction of a light source is set as &thetas;, a plurality of light sources 21A, 21B, 21C are arranged on under surfaces 13A, 13B, 13C of a base 12 such that &thetas; is composed of two kinds or more and the brightness of the light source of larger &thetas; is increased as compared to the light source of smaller &thetas;. The brightness of the light source of larger &thetas; having wide range of irradiation is increased and, therefore, the evenness of illuminance of the irradiation surface can be materialized. |
