Thin film dichroic color separation filters for color splitters

Details Thin film dichroic color separation filters for color splitters Thin film dichroic color separation filters for color splitters

1998-05-15

1999-06-22

Epps, Georgia

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359586, 359588, 359589, 359629, 359638, 359640, 204471, 20419226, 20419227, 20419228, 20419829, 349 5, 349 9, 349 57, 349105, G02B 528, G02B 2714, H04N 931

Patent

active

059148179

ABSTRACT:
An optical filter is provided for use in color projection display imaging systems which utilize liquid crystal light valves for image modulation. The optical filter is a dichroic coating which separates light into different colors. The optical filter is located on a light transmissive surface of a color splitting device such as a Philips prism. The optical filter is formed from layers of at least two different dielectric materials including a high refractive index material, such as zirconium oxide and a low refractive index material such as aluminum oxide. The low refractive index material has an average refractive index of no less than about 1.6. The high refractive index material has an average refractive index which is sufficiently greater than the average refractive index of the low refractive index such that the average refractive index of the high refractive index material divided by the average refractive index of the low refractive index material yields a ratio that is greater than about 1.2 and less than about 1.55.

REFERENCES:
patent: 4009941 (1977-03-01), Verdijk et al.
patent: 4373782 (1983-02-01), Thelen
patent: 4770496 (1988-09-01), Mahlein
patent: 4851095 (1989-07-01), Scobey et al.
patent: 5042912 (1991-08-01), Sato et al.
patent: 5225057 (1993-07-01), LeFebvre et al.
patent: 5513039 (1996-04-01), Lu et al.
patent: 5600487 (1997-02-01), Kiyomoto et al.
patent: 5621486 (1997-04-01), Doany et al.
patent: 5625491 (1997-04-01), von Gunten et al.
patent: 5670030 (1997-09-01), Solberg et al.
J.P. Lehan, R.B. Sargent, and, R.E. Klinger, "High-Rate Aluminum Oxide Deposition by MetaMode Reactive Sputtering," J. Vac. Sci. Technol. A 10(6), pp. 3401-3406, Nov/Dec 1992.
J.W. Seeser, P.M. LeFebvre, B.P. Hichwa, J.P. Lehan, S.F. Rowlands, and T.H. Allen, "Meta-Mode Reactive Sputtering: A New Way to Make Thin Film Products," Society of Vacuum Coaters 505/298-7624, 35t Annual Technical Conference Proceedings (1992), pp. 229-235.
Alfred Thelan, "Avoidance of Enhancement of Polarization in Multilayers," J. Opt. Soc. Am., vol. 70, No. 1, pp. 118-121, Jan. 1980.
Internet publication entitled "Exposing the Digital Image on Film," Internet website for Kodak. Applicant first become aware of this internet publication on Jul. 30, 1998. Applicant is unaware when it was first available.
Internet publication entitled "Technical Specifications" Internet website for Kodak . Applicant first became.

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