Optics: image projectors – Housing
Patent
1994-05-16
1995-05-16
Cuchlinski, Jr., William A.
Optics: image projectors
Housing
353DIG3, G03B 2130
Patent
active
054165415
ABSTRACT:
A folding, portable overhead projector includes a thin stage body housing a fresnel lens on its top surface. The stage body is thicker on one side to form a lamp enclosure. A hinged mirror is provided within the stage body below the fresnel lens and a hinged lamp socket is provided within the lamp enclosure. Two pairs of folding legs are hingedly coupled to the stage body and the lamp enclosure and fold out from under the projector to lower the mirror and lamp and form a collapsible base for the projector. When unfolded, the legs tilt the lamp and the mirror so that light from the lamp is reflected by the mirror up through the fresnel lens on the stage. A collapsible bellows, a light baffle, and the mirror provide a substantially light and airtight enclosure for the lamp and mirror. Additional pairs of folding legs provide balance for the projector. At least one pair of legs are biased by a torsion spring and all of the legs are coupled to each other so that opening and closing is performed in a single action. An articulating foldable arm carrying a projection lens and mirror is attached to the lamp enclosure and is positionable over the stage. A high efficiency cooling fan cools both the lamp add the stage. Interlock and temperature safety switches are provided as well as unswitched accessory outlets. The projector is extremely light weight and collapses to a thin package which can fit into a brief case.
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Presentation Products Magazine, May 1993, pp. 46-50, discloses "Overhead Projectors: A Fine Vintage Technology that Gets Better with Age".
Dukane Corporation catalog circa 1993 discloses a number of portable overhead prjectors and accessories.
An advertisement of Elmo Mfg. Corp., Sep. 1993, discloses fifteen models of overhead projectors.
Cuchlinski Jr. William A.
Dowling William C.
Gordon David P.
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