Optical: systems and elements – Single channel simultaneously to or from plural channels – By refraction at beam splitting or combining surface
Patent
1998-07-09
2000-06-06
Mack, Ricky
Optical: systems and elements
Single channel simultaneously to or from plural channels
By refraction at beam splitting or combining surface
359634, G02B 2712, G02B 2714
Patent
active
060726350
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.
REFERENCES:
patent: 5098183 (1992-03-01), Sonehara et al.
patent: 5221998 (1993-06-01), Sugahara
Hashizume Toshiaki
Yajima Akitaka
Mack Ricky
Seiko Epson Corporation
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