| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an illuminating apparatus used to illuminate hard copy documents for digital recording such as in facsimile machines and digital copying machines. <P>SOLUTION: An optical element 10 comprises a light-transmissive material of a predetermined refractive index and has a first main surface 12, a second main surface 14, an exit surface 16 and a back structure 18. The back structure 18 has a plurality of small planar surfaces, each interspaced with discontinuity surfaces 52 and forming an arc symmetrical relative to a center line of the optical element. In at least the first main surface 12, a cavity 60 is formed, light L emanating from a light source 20 disposed in the cavity 60 is reflected by each small planar surface and is directed so as to exit substantially perpendicular to the exit surface 16. The overall desired effect is substantially even distribution of light through the entire area of exit surface 16. <P>COPYRIGHT: (C)2008,JPO&INPIT |
