Binocular stereoscopic viewers

Patent

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Details

350287, G02B 2724, G02B 718

Patent

active

044640153

ABSTRACT:
Binocular stereoscopic viewers for viewing large drawings, paintings and prints, particularly those having dimensions larger than the interpupillary distance utilize two sets of nearly parallel mirrors and deviate the apparent position of the eyes inward towards the nose. Another viewer comprises a pair of prisms oriented such that the images viewed are reflected off their bases by total internal reflection. In the preferred prism viewer the apices of the prisms are hinged together in front of the nose of the viewer and the viewer may be stored with two sides together to form a prism shaped structure. In the preferred structures of both the mirror and the prism viewers, the left eye views the stereogram on the right and the right eye views the stereogram on the left and the surfaces of the device presented to the viewer are concave over the viewer's nose.

REFERENCES:
patent: 2410757 (1946-11-01), Street
patent: 3274884 (1966-09-01), Sortor
patent: 3539939 (1970-11-01), Courtney-Pratt
patent: 3655264 (1972-04-01), Pickett
patent: 4353621 (1982-10-01), Geer et al.

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