Optical: systems and elements – Single channel simultaneously to or from plural channels – By refraction at beam splitting or combining surface
Reissue Patent
2005-06-07
2005-06-07
Mack, Ricky (Department: 2873)
Optical: systems and elements
Single channel simultaneously to or from plural channels
By refraction at beam splitting or combining surface
C359S634000, C359S637000, C348S337000, C348S338000
Reissue Patent
active
RE038740
ABSTRACT:
The invention provides a dichroic prism capable of reducing displacements of projection pixels of colors caused by chromatic aberration of magnification. A dichroic prism is formed in the shape of a quadrangular prism as a whole by joining four rectangular prisms together. A red reflecting dichroic plane and a blue reflecting dichroic plane intersect to form substantially an X shape along junction surfaces of the prisms. The red reflecting dichroic plane is convex-shaped by partly changing the thickness of an adhesive layer for connecting the rectangular prisms together. Accordingly, since a red beam can be guided to a projection optical system while being enlarged, it is possible to reduce a projection image of the red beam to be projected onto a projection plane via the projection optical system. This makes it possible to reduce relative displacements of projection pixels of color beams caused by chromatic aberration of magnification.
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patent: 5098183 (1992-03-01), Sonehara et al.
patent: 5221998 (1993-06-01), Sugahara
patent: 6172815 (2001-01-01), Hashizume et al.
patent: 5-341254 (1993-12-01), None
patent: 7-294845 (1995-11-01), None
Hashizume Toshiaki
Yajima Akitaka
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