Rotating backscreen and/or projectors for off-axis large field o

Details Rotating backscreen and/or projectors for off-axis large field o Rotating backscreen and/or projectors for off-axis large field o

1996-10-30

1999-12-21

Dowling, William

Optics: image projectors

Reflector

353 46, 434 44, 348 36, G03B 2100

Patent

active

060039957

ABSTRACT:
An off-axis backscreen visual display system with rotating backscreen and projector assembly. The system includes a full color projector for projecting the image beam, and a backscreen which redirects the image beam from the projector onto a collimating mirror. The mirror in turn reflects the beam toward the observer eye point. The backscreen and projector are mechanically integrated together to form an integrated assembly which is mounted for rotation about a pivot point. The collimating mirror is oversized relative to the nominal beam size so as to present mirror surface to the beam redirected by the backscreen through a range of rotation of the integrated assembly. An actuator system rotates the integrated assembly about the pivot point to obtain increase vertical field of view. The backscreen can alternatively be fixed in position, with only the projector assembly rotating. The projector can include electronic image positioning capabilities, so that the active area for the image is located in a lower projector area or in an upper projector area, to provide a virtual rotational capability.

REFERENCES:
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patent: 3784742 (1974-01-01), Burnham et al.
patent: 3785715 (1974-01-01), Mecklenborg
patent: 4634384 (1987-01-01), Neves et al.
patent: 5137348 (1992-08-01), Lacroix
patent: 5253116 (1993-10-01), Lacroix
patent: 5433608 (1995-07-01), Murray
patent: 5566370 (1996-10-01), Young

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