Patent ID: 8282262

Claim:
A light guiding panel assembly used for a display, a signboard, a surface illumination or the like, comprising: a synthetic-resin-made light guiding plate for guiding incident light from a light source via an incident end face; and a light source holder extending to the incident end face of the guiding plate, wherein the light source holder integrally includes: a light source receiver having a light transparent hole at the incident end face side; and a standing plate standing from the light source receiver, and is formed in an L-shape, and wherein the light source is received in the light source receiver of the light source holder to provide the incident light to the incident end face, and the light guiding plate and the standing plate are movable, and the standing plate is integrally fixed to the light guiding plate, so that the light guiding holder can follow heat expansion or contraction of the light guiding plate, wherein the light source is an LED unit composed of LED chips arranged in series in a longitudinal direction of a substrate, and the light receiver of the light source holder is formed in a C-shape in a cross section having an open groove as a light transmitting hole, and wherein an end of the light guiding plate is operable to contact projections opposite to each other disposed at both ends of the opening groove, and spacers are provided on the substrate by a crossed-arrangement of the spacers on the substrate in between the LED chips and covered by the projections, thereby the LED unit is received in the light source receiver of the light source holder.