The optical convergence sheet, to be provided in surface light equipment and the surface light equipment

摘要

PPROBLEM TO BE SOLVED: To provide a light convergent sheet which can converge and emit light into only a necessary range and is capable of performing even and uniform illumination independent of a position from which a screen is observed, to provide a surface light source device provided with the light convergent sheet and to provide a transmission type display device provided with the surface light source device. PSOLUTION: A flat surface 141a is formed on a top surface part of a unit lens 141. A reflection part 142 is formed on the flat surface 141a and light reaching the reflection part 142 is reflected, is returned to the light emission tube 13 side and is reused. Further, from parts other than the reflection part 142, light is emitted at a relatively small angle and, therefore, the light can be efficiently converged. PCOPYRIGHT: (C)2007,JPO&INPIT