| 摘要 |
The invention relates to a backlight (10) that is disposed on a rear surface side of a subject to be irradiated and illuminates the subject to be irradiated from the rear surface side, and the backlight includes: a light guide plate (12) ; lateral light guide (13A) disposed along an end surface on one side of the light guide plate; and a light source (13) disposed to an end portion of the lateral light guide; wherein one surface side of the light guide plate is formed into a reflection surface (12C) on the reflection surface, a plurality of grooves (14) or projections that are formed of a gentle slope portion and a steep slope portion is continuously formed in parallel stripes; so as to reflect light propagating inside the light guide panel; the other surface side of the light guide plate is formed into an exit surface that outputs the light reflected by the reflection surface; and outside of the exit surface, the subject to be irradiated is disposed. <IMAGE>
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