Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1999-01-19
2000-04-18
Epps, Georgia
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
359629, 359634, 359640, 349 57, 349114, 353 30, 353 31, G02B 528, G02B 2714, G03B 2100, G02F 11335
Patent
active
060522313
ABSTRACT:
An optical element useful in optical systems such as liquid crystal optical display devices which is capable of projecting images having a high degree of contrast is provided. The optical element comprises a set of prisms whose coatings are designed to cancel one component of the depolarization in the light the prisms deliver. The other depolarization component is removed by returning the light to the projection lens through the same sequence of color-dividing coatings in reverse order. Hence, the optical element eliminates the depolarization components by employing double-pass propagation of polarized light therethrough.
REFERENCES:
patent: 5459593 (1995-10-01), Ootaki
patent: 5594591 (1997-01-01), Yamamoto et al.
patent: 5914817 (1999-06-01), Browning et al.
patent: 5986815 (1999-11-01), Bryars
Epps Georgia
International Business Machines - Corporation
Morris, Esq. Daniel P.
Spector David N.
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