Display demonstration system for providing enlarged projected image of calculator display

Claim 1

A display demonstration system for providing an enlarged projected image of the display of an electronic data processing apparatus on a plane surface to facilitate a didactic experience for viewers of the enlarged image, said system comprising: an electronic data processing apparatus having a keyboard provided with a plurality of keys for selective actuation of individual keys by an operator to provide data input, memory means for storing the data input, a display for providing visual images representative of keyboard inputs, and processor control means connected to said keyboard and said memory means for regulating display data provided to said display in producing an image thereon related to the data input by said keyboard; an image projector including a base housing having a light source disposed therein and having a top surface provided with an opening therethrough in registration with the light source, a base lens mounted in the opening in the top surface of said base housing, an elongated standard connected to said base housing and extending vertically above the top surface thereof in which the base lens is provided, and a lens assembly housing connected to said elongated standard and suspended over said base housing in overhanging vertically spaced relationship with respect to the top surface of said base housing, said overhanging lens assembly housing including a projecting lens system therein in optical alignment with the base lens in the top surface of said base housing and the light source disposed in said base housing for projecting light onto a plane surface remotely located with respect to said image projector; a heat shield plate provided on the top surface of said base housing of said image projector, said heat shield plate having a window therethrough in registration with the base lens in the top surface of said base housing and the light source disposed in said base housing; platform means disposed on the top surface of said base housing of said image projector in the space between said base housing and said overhanging lens assembly housing, said platform means including an elevated surface thereon vertically spaced above the top surface of said base housing and vertically spaced below said overhanging lens assembly housing, said elevated surface of said platform means defining a support transparent to light; a remote display unit adapted to be received on the transparent support defined by the elevated surface of said platform means, said remote display unit including a light-transmissive remote display disposable in optical alignment with the window in said heat shield plate, the base lens in said base housing, and the light source within said base housing; said remote display unit having means for regulating the contrast of the image and background content to be provided on said remote display; and an electrical cable connecting said electronic data processing apparatus and said remote display unit; the display of said electronic data processing apparatus acting as a source display and the remote display of said remote display unit acting as a target display such that said remote display provides a replicated image of the image appearing on the display of said electronic data processing apparatus in response to data processing operation initiated by data inputs via said keyboard; whereby an enlarged image of the display of the electronic data processing apparatus is projected from said remote display by the lens system within the overhanging lens assembly housing of said image projector onto a remote plane surface for viewing.