| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light irradiation apparatus capable of reducing a region without having a light emitting part when an observation hole is viewed from an observation object region without causing complication and expansion of a structure, and of appropriately executing shadowless illumination or the like. <P>SOLUTION: This light irradiation apparatus is provided with: the observation hole arranged between an external observation point and the observation object region and on an observation axis line connecting them; a first light emitting part arranged around the observation hole for irradiating the observation object region with light; a half mirror arranged obliquely with respect to the observation axis line between the observation hole and the external observation point; a second light emitting part arranged at a position where the light emitted therefrom is reflected by the half mirror and emitted to the observation object region through the observation hole; and an optical path wall inside surface covering an optical path from the second light emitting part to the half mirror and an optical path from the half mirror to the observation hole; and is structured such that a part or the whole of the optical path wall inside surface is a mirror surface. <P>COPYRIGHT: (C)2007,JPO&INPIT |
