Planar imaging optical system surface light source and display box and imaging optical system illumination system using the same

摘要

PROBLEM TO BE SOLVED: To provide a plate-shaped focusing optical system plane light source of thin total thickness, having an irradiation object surface of high illuminance uniformity and having a light radiation surface smaller than the irradiation object surface.SOLUTION: A plate-shaped focusing optical system plane light source comprises a plate-shaped planar light source and a plate-shaped focusing member, irradiating an irradiation object surface C with light and having a maximum thickness Tof 50 mm or less. The plate-shaped planar light source includes a planar light radiation body, and a planar emission surface A emitting the radiation light radiated from the planar light radiation body as emission light, and the plate-shaped focusing member can receive the emission light, radiates the received light as irradiation light, and includes a planar irradiation surface B for focusing at least one direction of the planar emission surface A to the irradiation object surface C. Further an area Sof the planar irradiation surface B is once or more and 1.5 times or less as large as an area Sof the planar emission surface A.SELECTED DRAWING: Figure 1