Patent attributes
A lighting device for applying light to an irradiation object includes a light source, an optical member, an optical sheet, and a housing member. The optical member is in a plate shape through which light from the light source enters. The optical sheet is configured to apply optical action to the light exiting from the optical member. The optical sheet includes a plate body portion and an extending portion provided on at least a first end of the body portion. The extending portion is folded in a zigzag manner and arranged in such a manner as to cover a region between the outer peripheral edge of the optical member and the housing member. The housing member is configured to surround an outer peripheral edge of the optical member and an outer peripheral edge of the optical sheet.
