| 摘要 |
PROBLEM TO BE SOLVED: To obtain a surface light source device in which a sheet for controlling outgoing light having projections to condense the light by using total reflection is disposed on the exit face of a light transmission plate, to obtain a surface light source device in which only the tops of the minute projections of the controlling sheet for outgoing light are adhered without embedding the projections in an adhesive layer, and to obtain a method for the production of this device. SOLUTION: This surface light source device is equipped with light sources 2, reflectors 9, a light guide 3 in which the light from the light sources reflected by the reflectors 9 enters through end faces 1, and a sheet 4 for controlling outgoing light. The controlling sheet 4 has a plurality of projections on the surface facing the exit face of the light transmission body 3 and is disposed on the exit face 6 of the light guide 3 so as to allow the light from the exit face 6 of the light guide 3 to propagate along the direction to the front face. The top ends of the projections 7 of the controlling sheet 4 for outgoing light and the exit face 6 are bonded with a UV-curing resin 8. In the production of the surface light source device, the UV-curing resin 8 to be used to bond the top ends of the projections 7 of the controlling sheet 4 for outgoing light and the exit face 6 of the light transmission body 3 is preliminarily irradiated with weak UV rays into a half-cured state, then the controlling sheet 4 for outgoing light is laminated on the exit face 6 of the light transmission body 3, and then the UV-curing resin 8 is irradiated with intense UV rays so that the UV-curing resin 8 is completely hardened. |
