| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting device with illumination distribution in a longitudinal direction of a light-emitting part uniformized as much as possible. <P>SOLUTION: A light-emitting part 2 has a prism panel 10 attached to a light irradiation window 9 formed along a longitudinal direction of a light guide tube 8. One side surface of the prism panel 10 is a steep-slope-forming surface X formed so as to get a greater proportion of the irradiated light in a reverse direction to an incident light from outside, the other side surface is a minute-slope-forming surface Y formed so as to get a greater proportion of the irradiated light in the same direction as the incident light from outside, and an adjacent part 10a of a light source part 1 is arranged to have the steep-slope-forming surface X faced to an inner side of the light guide tube 8, while on the other hand, the other part 10b is arranged to have the minute-slope-forming surface Y faced to the inner side of the light guide tube 8. <P>COPYRIGHT: (C)2004,JPO |
