Patent ID: 9322976
Filing Date: 2016-04-26
CPC Classification: G02B

Claim Text:
1. A lighting device comprising: a first light source; a second light source opposed to the first light source and arranged in a high temperature area in which a temperature tends to become higher than an area in which the first light source is arranged; a light guide plate arranged between the first light source and the second light source and configured such that rays of light from the first light source and the second light source enter through end surfaces opposite the first light source and the second light source, respectively, and exit through a plate surface on a light exiting side; a light source driver configured to drive the first light source and the second light source to supply a smaller current to the second light source than a current supplied to the first light source; and light reflection portions configured to reflect rays of light in the light guide plate to the light exiting side to increase rays of light exiting from the plate surface of the light guide plate on the light exiting side and arranged such that an area distribution in a plane of the plate surface of the light guide plate increases as a distance from corresponding one of the first light source and the second light source increases and takes a maximum value at a point closer to the second light source; wherein a distance between the first light source and one of the end surfaces of the light guide plate is larger than a distance between the second light source and the other one of the end surfaces of the light guide plate.