Optics: image projectors – Cabinet encloses projector and one side of screen – Reflector between lamp and screen
Patent
1997-01-14
1998-08-11
Dowling, William
Optics: image projectors
Cabinet encloses projector and one side of screen
Reflector between lamp and screen
353 99, 353119, G03B 2114
Patent
active
057917540
ABSTRACT:
An apparatus for displaying an image on a screen is disclosed. The display has a projection lens for projecting the image; a first reflective surface for receiving the projected image and reflecting a first reflected image having a first central optical axis; and a second reflective surface for receiving the first reflected image and reflecting a second reflected image having a second central optical axis onto said screen. The first and second reflective surfaces provide a folded projection path, wherein the first and second central optical axes are in the same plane. Alternatively, the first and second central optical axes do not lie in a common plane. This further reduces the size of the displaying apparatus. A third reflective surface is also provided to further reduce the size of the display. The two or three reflective surfaces or mirrors are enclosed in an environmentally sealed compartment. The projection lens has a reduced illumination angle and an increased lens-to-screen distance.
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Cipolla Thomas Mario
Doany Fuad Elias
Singh Rama Nand
Dowling William
International Business Machines - Corporation
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