| 摘要 |
A television projection system utilizing one or more cathode ray tubes (22, 42, 44, 46) having concave light emitting surfaces (26) (when viewed from the front) that modify the Lambertian radiation provided by cathode ray tubes having flat light emitting surfaces in order to direct the light radiation into the lens system (28) more effectively. The radius of curvature (32) of the light emitting surface is selected as a function of the optical distance between the light emitting surface and the effective light entry point (30) of the lens system, as well as the diameter of the image source (D) to optimize the brightness of the projected image. |
