Patent ID: 8625050
Filing Date: 2014-01-07
Classification: G02B

Abstract:
1. A light guide plate comprising: a light incident surface configured to be arranged facing a point light source for introducing light from the point light source; a light outputting surface that outputs the light to an outside of the light guide plate; a light introducing section for confining the light from the point light source entered from the light incident surface; and a light guide plate main body having a thickness smaller than a maximum thickness of the light introducing section and being arranged to be continuous with the light introducing section, for outputting the confined light to the outside of the light guide plate from the light outputting surface by a light outputting element, wherein the light introducing section has an inclined surface that is inclined toward an end of a surface of the light guide plate main body from a surface of a portion having a greater thickness than the light guide plate main body, on a surface on the light outputting side of the light guide plate or on an opposite surface thereof, and wherein the light guide plate further comprises a directivity converting pattern, for converting a directivity expansion in a thickness direction of the light guide plate of the light entered to the light introducing section to directivity characteristics tilted toward a direction parallel to a surface direction of the light guide plate, on the surface on the light outputting side or on the opposite surface thereof.