Patent ID: 6152569
Filing Date: 2000-11-28
Classification: G02B,H01J

Abstract:
A flat light source device for illumination use, comprising:a light-guiding plate which has a planar-shaped light-emitting surface for emitting rays of light and has a tapered light-diffusing surface on an opposite side of said light-emitting surface of said plate; andtwo discharge tubes equipped outside a side surface of said light-guiding plate as light sources, wherein:said two discharge tubes are disposed substantially in parallel to said light-emitting surface as well as substantially in parallel to said side surface;a virtual plane defined by both central axes of said two discharge tubes orients substantially orthogonal with respect to said side surface; andone of said discharge tubes disposed more adjacently to said side surface of said light-guiding plate than another of said discharge tubes is a neon tube having a transparent glass.