Patent ID: 7420158

Claim:
A spread illuminating apparatus comprising: at least one point light source; a light conductor plate having an end surface including at least one light inlet face opposing the point light source; and a housing frame to hold the point light source and the light conductor plate, wherein: the housing frame comprises an inner frame member, and an outer frame member having a first end wall and adapted to enclose the inner frame member; the point light source is disposed at the first end wall of the outer frame member; the light conductor plate and the inner frame member are jointed to each other via two first joint means thereby constituting a subassembly which has, at its one end, interface surfaces to make contact with the first end wall of the outer frame member; the light inlet face of the light conductor plate recedes from the interface surface of the subassembly by a predetermined dimension; each of the two first joint means comprises an elastic member to press the light conductor plate toward the interface surfaces of the subassembly; and the subassembly is jointed to the outer frame member via two second joint means each of which comprises an elastic member to press the interface surfaces of the subassembly toward the first end wall of the outer frame member.