Optical: systems and elements – Stereoscopic – With right and left channel discriminator
Patent
1998-10-02
2000-11-28
Spyrou, Cassandra
Optical: systems and elements
Stereoscopic
With right and left channel discriminator
359469, 600111, 348 45, G02B 2726, G02B 2722, A61B 104, H04N 1300
Patent
active
061543152
ABSTRACT:
Apparatus and method for providing stereo-image pairs, typically for use in endoscopy. A birefringent optical component creates two virtual pupils to provide spaced view points of an object field through a single real pupil, the light from each of the two view points having a respectively different polarization. The birefringent component may be in the form of a calcite slab or comprise liquid crystal material. By suitable orientation of two such components with respect to each other, the path lengths for the two polarizations of light may be made equivalent and rotation of the planes of polarization of this light through 90 degrees by means disposed between the birefringent components can improve the performance of the system. The rotation device may comprise a half-wave plate or a layer of liquid crystal material. By tilting the slab of calcite, the observer may be provided with a change in view point and, thereby, some motion parallax. In one embodiment of the invention, a polarizing beam splitter directs light corresponding to each of the two view points to respectively different CCD's, following its passage through the single pupil.
REFERENCES:
patent: 5222477 (1993-06-01), Lia
patent: 5610765 (1997-03-01), Colucci
patent: 5617387 (1997-04-01), Morita et al.
patent: 5649897 (1997-07-01), Nakamura et al.
patent: 5715029 (1998-02-01), Fergason
Spyrou Cassandra
Winstedt Jennifer
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