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US 4,789,220 AGranted
Stereoscopic print viewer
OwnerWolcott Kinnardinventor
Life of this patent
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OwnerWolcott Kinnardinventor
Estimating the term…
The improved stereoscopic print viewer provides a simple interoccular adjustment to permit maximum comfortable magnification. A new method of focusing and holding the prints gives minimum viewer size. A variable focus adjustment automatically locks in place. The method of holding the prints positions them in close optical alignment, and requires minimum size. Prints are provided with a notch mating with a boss in the print holder. Special print borders are provided for an improved stereoscopic "window". The lenses follow the optical system devised by Oliver Wendall Holmes, but fold compactly together when not in use, with each lens on a pivot with means to index it properly into a viewing position. Each lens can also be indexed further to provide a hand held magnifier with the power of one lens, or, by indexing the other lens to a matching position, twice the magnifying power is obtained. The entire assembly is mounted on a center plate which positions and holds the viewer elements and which acts as a light baffle to separate the stereoscopic pairs in viewing.
In a stereoscopic print viewer, a pair of magnifying lenses movably mounted to a structure, a center plate positioned between said viewer lenses to hold said structure, a means to move said lenses to fold flat upon said centerplate, a means to unfold said lenses back into viewing position, a means for holding a stereoscopic print pair in position to be viewed through said lenses, and a means to retract into said structure said means for holding said stereoscopic print pairs.
Dependencies are inferred from the claim text.