Projection display apparatus

Details Projection display apparatus Projection display apparatus

1987-03-16

1988-11-29

Haroian, Harry N.

Optics: image projectors

Temperature control

Blower

353 60, G03B 2116

Patent

active

047877375

ABSTRACT:
A projection display apparatus includes a light source unit for generating light for image formation, an electro-optical display device for displaying an optical image by utilizing the light emitted from the light source unit, and an enlarging/projection lens. The light source unit, the display device, and the projection lens are accommodated in a housing with vent openings. The housing also includes a fan for cooling the interior of the housing with cool air and a cooler for maintaining a display panel within a predetermined temperature range. The light source unit includes a lamp and a reflector and is designed not to cause image deformation and formation of a shadow of a discharge portion. In order to display a television image on the display device, all television image display circuit units excluding an antenna are accommodated in the housing. The enlarging/projection lens can control a magnification and a focal point of the image projected on the screen.

REFERENCES:
patent: 2837965 (1958-06-01), Goldsmith
patent: 3250175 (1966-05-01), Braun
patent: 3400995 (1968-09-01), Borberg
patent: 3844650 (1974-10-01), Nicholson et al.
patent: 3895866 (1975-07-01), Ouervain et al.
patent: 4453810 (1984-06-01), Curiel

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