LIGHT SOURCE DEVICE, SURFACE LIGHT SOURCE DEVICE, DISPLAY DEVICE, AND ILLUMINATION DEVICE

摘要

This surface light source device comprises a light source and a light guide body. The light source has at least a light-emitting element having a light-emitting surface and a concave mirror for reflecting the light emitted from the light-emitting element. The light guide body has an end surface from which light emitted from the light source is incident, and a primary surface from which the light, having propagated within the interior, is emitted. At least a part of the cross-sectional shape of the concave mirror when cut in a plane parallel to the primary surface of the light guide body has a curved shape having a focus point. The light-emitting element is disposed such that the focus point is located on the light-emitting surface. The light from the light-emitting element is incident on the light guide body via the concave mirror.