Abstract: An X-ray stand comprising a generally arcuate swing arm (10) on which is provided an X-ray tube (15) in a stationary housing (14) and an X-ray detector (16). The detector (16) is hingedly mounted via a smaller arm (20) to the swing arm (10), so as to enable the smaller arm (20) to pivot relative to the upper end of the swing arm (10). The detector plate (16) is mounted to the free end of the smaller arm (20) by means of a joint (22) which enables the detector plate (16) to be pivoted relative to the smaller arm (20). In addition, the X-ray tube (15) is mounted on a pivotal carriage (15a) within the housing (14) such that it can be relatively tilted, and the carriage (15a) in or on which the X-ray tube (15) is provided is mounted within the housing (14) on a sliding mechanism (30) which permits the selective rotational movement of the X-ray tube (15) within the housing (14).

Abstract: An object of the invention is to provide an optical collective substrate and a display device using it, which can make effective use of light while avoiding generation of chromatic aberration in transmitted light. An optical substrate (20) of an optically transmissive material having a structure in which incident light Li from one principal plane (21) side of the substrate is locally focused toward an array of apertures (201) formed on the other principla plane (22). The one principal plane (21) is provided with grooves 2v being filled with an optically transmissive substance 2m of a predetermined refractive index, the filled groove portions 2V allowing the incident light Li from the one principal plane (21) side to be collected onto the respective apertures (201).