| 摘要 |
A lighting device preventing an illumination variation on a surface to be irradiated. The lighting device has a first light emitting surface section (102a) which is a surface formed by rotating a bus with a central axis as a rotation axis in a first angle area (-theta1@theta@theta1) of an angle (theta) relative to a cross section of the bus which is an intersection line with the cross section perpendicular to a surface (801a) to be irradiated and including the central axis of a lighting lens (100), a second light emitting surface section (102b) formed in a second angle area (theta1@theta@180° and -180°@theta@-theta1) of the angle (theta) so that a light flux emitted toward the surface (801a) increases as compared with the case where the first light emitting surface section (102a) is formed in a whole-angle area (0°@theta<360°) on the light emitting surface section (102), a third light emitting surface section (102c) formed by the step between the first light emitting surface section (102a) and the second light emitting surface section (102b).
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