Cross dichroic prism and reflection type liquid crystal...

Details Cross dichroic prism and reflection type liquid crystal... Cross dichroic prism and reflection type liquid crystal...

2006-06-27

2006-06-27

Perkey, W. B. (Department: 2851)

Optics: image projectors

Prism in light path

C353S033000, C353S084000, C359S834000

Reexamination Certificate

active

07066603

ABSTRACT:
A cross dichroic prism for color decomposition includes a blue-reflecting dichroic film for reflecting a blue light component and a red-reflecting dichroic film for reflecting a red light component. Each dichroic film comprises lower and higher refractive index materials alternately laminated on a prism base. The cross dichroic prism satisfies 1.105≦Nh/Nl≦1.450 if Ng≦Nl, or 1.118≦Nh/Nl≦1.150 if Ng>Nl, where Ngis the refractive index of the prism base, Nhis the refractive index of the higher refractive index material, and Nlis the refractive index of the lower refractive index material.

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patent: 2002/0008770 (2002-01-01), Ho et al.
patent: 2003/0071976 (2003-04-01), Okuyama et al.
patent: 2001-209024 (2001-08-01), None

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