Patent ID: 7083317

Claim:
A surface-shaped light irradiation device comprising: a dot light source which comprises a flat light emitting surface for emitting a light, and which emits a light substantially radiately; and a light guiding plate which comprises a light entrance end surface from which a light emitted from said flat light emitting surface of said dot light source enters, a light emitting surface which is one principal surface for guiding the light entering from said light entrance end surface and emits a substantially uniform light therefrom, a back surface which is an other principal surface opposite to said light emitting surface, and a retaining section which retains said dot light source at a predetermined set position, wherein said retaining section includes a wall which surrounds a periphery of said dot light source, said wall being formed by said light entrance end surface positioned at one end of said light guiding plate, and said dot light source is disposed in an area surrounded by said retaining section and said light entrance end surface, and is fixed to said retaining section in a state where said flat light emitting surface abuts on said light entrance end surface of said light guiding plate by an adhesive agent disposed between a surface of the dot light source, other than its flat light emitting surface, and the retaining section.