Patent ID: 7210841
Filing Date: 2007-05-01
Classification: G02B,G02F

Abstract:
1. A lighting unit comprising: a lighting element provided with, a light guiding plate having a light emission face, facets and a rear face, a light source provided at one of the facets and a reflector covering the rear face and the facets of the light guiding plate and the light source, wherein light emitted from the light source is guided into the light guiding plate and is emitted from the light emission face outside the lighting element; a housing covering an edge portion of the light emission face, the facets and the rear face of the light guiding plate, wherein heat discharge holes discharging heat generated in the lighting unit to the outside of the lighting unit are formed in a region of the housing which is located so as to correspond to the rear face of the light guiding plate; and a dust shield portion preventing airflow and being provided between at least the rear face of the light guiding plate and the housing so as to cover the heat discharge holes.