| 摘要 |
An LCD backlight (10) has a light source (12) that emits a laser light, a lens (21), a mirror (13), a rotary polygon mirror (14), a scanning lens (15) and a return mirror (16) constituting a transforming optical system that transforms the laser light from the light source (12) to a linear light, and a light guiding plate (17) that allows the linear light to enter and emits two-dimensional light in the horizontal direction. An emission end face (19) of the light source (12) is disposed in a rear face side of the light guiding plate (17) so that a surface normal line thereof is in the horizontal direction or is inclined downward from the horizontal direction, and the lens (21), mirror (13) and scanning lens (15) are disposed in the rear face side of the light guiding plate (17), so that surface normal lines of the light transmission surface and light reflection surface thereof are all in the horizontal direction or are inclined downward from the horizontal direction. |
