A thin schaukasten which is composed of a diffusive transparent plate, a light homogenizing member, a fluorescent lamp and a reflection member and in which the light homogenizing member has a reflection pattern formed on a transparent support media to provide a distribution of transmission for preventing non-uniform luminous intensity on one surface of the diffusive transparent plate and the reflection member is disposed in such a manner as to reduce non-uniformity in luminous intensity on one surface of the light homogenizing member. A lighting circuit for the fluorescent lamp includes a frequency converter for preventing flicker when the fluorescent lamp is lit, and the lighting circuit is used in common to a plurality of fluorescent lamps.
A viewing device for X-ray films or the like automatically masks the areas of the viewing screen not in registry with the film to be viewed responsive to the insertion of a film. The device includes a dimension sensing mechanism which aligns a selected mask with a positioned film automatically in accordance with the sensed dimension.
A method of providing uniform illumination of a light transmissive image on the light transmissive display panel of a fluorescent backlit display or the like, which includes blocking of a portion of the light flux projecting from at least one elongated tubular lamp toward the display panel in a plane including the lamp axis and normal to said panel; and blocking decreasing amounts of light flux projected from said lamp toward the display panel at points thereon spaced at successively greater distances on each side of said plane. A variable opacity light leveling mask configured to produce the aforementioned uniform illumination is interposed between the lamp and the display panel.
A high intensity planar light source utilizes an array of halogen lamps to produce high intensity, flat field and stable color temperature illumination. The halogen lamps are arrayed in a rectangular area with a nonlinear distribution which locates a higher density of lamps in the corners of the array than elsewhere in the peripheral regions of the area. The array of lamps is energized by a DC power supply and series circuitry is employed to make the failure of one lamp easily detected.
Disclosed is a fluorescent lamp arrangement for uniformly illuminating a display panel wherein a fluorescent lamp having a glass tube is provided with electrodes at opposite sides thereof, a fluorescent layer is formed over an inner surface of the glass tube, and mercury and a rare gas are sealed in the glass tube; and a light-shading patterned layer is formed along a surface of the glass tube so as to make luminance on a display panel substantially uniform when the fluorescent lamp and the display panel are parallelly disposed to a plane which includes a longitudinal axis of the glass tube.
A rear illuminated fascia apparatus for mounting on a surface is disclosed. The apparatus has a support structure comprising support brackets, top and bottom edge frame members, and corner members which tension and hold in place a flexible, translucent sheet material. Metal halide lights are used to illuminate the sheet material. A light dispersion member is positioned between the lights and the sheet material to uniformly distribute and disperse the light through the sheet material. Access members in the apparatus and access openings in the light dispersion member allow convenient changes of the lights.
