Flat lighting device having an aperture lamp

摘要

A flat lighting device (8; 32) having an aperture fluorescent lamp (33), an optical system (10; 34) and an optical conductor plate (11; 35) is provided. The optical system (10: 34) specifically influences the light distribution of the light to be coupled into the optical conductor plate in such a way that seen in a cross-sectional plane of the tubular discharge vessel of the lamp, the light distribution has at least one maximum at an angular spacing beta, measured from the optical axis (A), the angular spacing beta fulfilling the following relationship:L being the longitudinal extent of the optical conductor plate in the direction of the optical axis (A) and d being its thickness.