Television – Video display – Projection device
Patent
1993-02-23
1994-08-16
Powell, Mark R.
Television
Video display
Projection device
348780, H04N 931
Patent
active
053391586
ABSTRACT:
A three color separation/synthesis mirror device includes a housing, four dichroic mirrors which are arranged in the housing and cross with each other at right angles to form an X-shape, and a liquid filled in the housing so as to submerge the respective dichroic mirrors. A refractive index of the liquid is higher than that of the dichroic mirrors. A correction prism for making an emergent light in parallel to an incidental light may be located in a corner on the incidental side of the X-shaped dichroic mirrors. Double image blurs due to the entrance rays can be obviated. Also, such a characteristic that the refractive index of the liquid is lowered when the liquid is heated, is utilized so that the refractive index of the liquid becomes close to the refractive index of the glass.
REFERENCES:
patent: 4151554 (1979-04-01), Tucker
patent: 4687301 (1987-08-01), Ledebuhr
patent: 4764806 (1988-08-01), Altman
patent: 5066114 (1991-11-01), Hodges
patent: 5168351 (1992-12-01), Bradley et al.
Akagi Manabu
Akiyama Masayuki
Pioneer Electronic Corporation
Powell Mark R.
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