Patent ID: 7502170
Filing Date: 2009-03-10
Classification: G01N,H05K

Abstract:
1. An illumination apparatus in which a through-hole for detection is formed at a center portion and which irradiates diffused light and directional light to an object to be detected, characterized in that at least an annular diffusion plate which diffuses light, light sources which are allocated annularly, and an annular reflection plate which reflects light from the light sources to said object to be detected, are respectively allocated in order from a side of said object to be detected, and the diffused light is generated by irradiating light from said light sources to the object to be detected through said diffusion plate, and the directional light is generated by reflecting light from said light sources by said reflection plate and then irradiating it to the object to be detected, and the light sources include a light source for diffused light and a light source for directional light, and an annular fixing plate on which the light source for diffused light is disposed on a surface facing said object to be detected, and the light source for directional light is disposed on another surface of the fixing plate and between said diffusion plate and said reflection plate.