Abstract: A compact, rigid camera has a folded optical path between an objective lens and a film plane and formed at least in part with a prism element having an entrance face, an exit face overlying and closely spaced from the film plane, and a reflective face. The exit face both reflects light which enters the prism at the entrance face and transmits light out of the prism. The reflective face is inclined to return to the exit face, for transmission to the film plane, the entering light internally reflected at the exit face. The entrance face of the prism is inclined relative to the reflective/transmissive face by an angle larger than the relative inclination of the reflective face. Light transmitting prism surfaces, spacings between optical elements, light absorptive coatings, and mechanical light controlling elements including a light collimator, prevent the entry of unwanted nonfunctional light into the prism and eliminate such light that does enter the prism.

Abstract: A cover arranged to hold an original document in the platen of an electrophotographic printing machine. The cover includes an outer member defining a chamber with an inner member being mounted therein. The outer member cooperates with the platen to form a light-tight seal while the inner member presses the original document thereagainst.

Abstract: An illuminated safety helmet is disclosed, which contains a battery powered rotating light source. Rotation of the light source produces a periodic blinking and/or color variation in order to enhance the visibility of the wearer under night time or other poor visibility conditions. The rotating light source is contained in a bubble-like protrusion at the apex of the helmet. A reflective partition separates the light source into two halfs.