Patent ID: 8870438
Filing Date: 2014-10-28
Classification: G02B,G02F

Abstract:
1. A surface light source device comprising: a light source and a lightguide plate accommodated in a frame such that an outer peripheral surface of the lightguide plate is surrounded by the frame, wherein light emitted from the light source is incident to the lightguide plate from an end face of the lightguide plate, wherein the light guided in the lightguide plate is output from a light output surface of the lightguide plate, wherein the frame comprises: wherein a light shielding sheet is disposed above the light source and the lightguide plate to cover surroundings of the light source and the lightguide plate therewith, and the light shielding sheet is bonded to upper surfaces of the first frame portion and the second frame portion while striding over a bonded surface in which the outer peripheral surface of the first frame portion and the inner peripheral surface of the second frame portion are in contact with each other.