Patent ID: 8913307

Claim:
An illumination apparatus configured to illuminate a surface to be illuminated from a first side and a second side different from the first side, the illumination apparatus comprising: a light guide; and a reflecting member, wherein the light guide comprises: an incident surface into which a light beam from a light source arranged in a one-dimensional direction enters; a side surface for totally reflecting a portion of the light beam which enters the incident surface; a reflecting surface arranged on an opposite side of the incident surface with respect to the side surface; a first exit surface for causing a light beam reflected by the reflecting surface to exit as a converging light beam, the first exit surface having a condensing action in a plane orthogonal to the one-dimensional direction, the converging light beam emitted from the first exit surface illuminates the surface to be illuminated as a light beam from the first side; and a second exit surface for causing a light beam from the light source, which is not reflected by the reflecting surface, to exit as a converging light beam, the second exit surface having a condensing action in the plane orthogonal to the one-dimensional direction, and wherein the reflecting member is configured to reflect the light beam from the second exit surface to the surface to be illuminated as a light beam from the second side, and wherein the light guide comprises a separating boundary between the first exit surface and the second exit surface, the separating boundary defining a concave portion.