Patent ID: 8267566
Filing Date: 2012-09-18
Classification: G02B

Abstract:
1. A planar lighting device comprising: a light guide plate including a concave rectangular light exit plane, two light entrance planes containing two opposite sides of the light exit plane and disposed opposite each other, two symmetrical inclined planes opposing to the light exit plane such that their distance from the light exit plane increases with the increasing distance from the two light entrance planes toward the center of the light exit plane, a curved portion connecting the two inclined planes, and light scattering particles for scattering light that propagates inside the light guide plate; two light sources respectively disposed opposite the two light entrance planes for emitting light to enter the light into the light guide plate through the light entrance planes; holder means for supporting and integrating each light source and the light guide plate while keeping their mutual distance constant; a housing for accommodating the light sources and the light guide plate integrated by the holder means; and sliding mechanisms allowing the light sources to slide in a direction parallel to the light entrance planes of the light guide plate to absorb the expansion and contraction of the light sources along the length thereof, wherein the sliding mechanisms each comprise pins provided on the housing engaged in long holes formed in the light source so as to be long in the direction parallel to the light entrance planes.