Patent ID: 7784986

Claim:
A light unit comprising: a plurality of light-emitting diode (LED) light sources arranged in parallel; a light-guiding member arranged on said LED light sources; a light reflecting part provided on a bottom surface of said light-guiding member for reflecting light from said LED light sources; a light diffusion part for diffusing outgoing light from a surface of said light-guiding member to outside; and an optical path changing part arranged above said light-diffusion part; wherein: a side of said light-guiding member that faces said light diffusion part is flat, said plurality of LED light sources is arranged along another side of said light-guiding member, a plurality of grooves is provided and arranged along said another side of said light-guiding member for respectively accommodating each of said plurality of LED light sources in corresponding grooves of said plurality of grooves, light from said LED light sources is reflected in an upward direction by the light reflecting part, said optical path changing part enables changing of an optical path in an in-plane orthogonal direction with respect to a linear alignment direction of said plurality of LED light sources, and wherein, when assuming that the height from the lower end of the reverse side of said light-guiding member to the thinnest portion on the reverse side thereof is as h 1 , and the height of the side portion of said light-guiding member is as h 2 , h 1 /h 2 ≧0.75.