Screen projection apparatus

Optical: systems and elements – Projection screen – Roll up screen

Patent

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Details

160120, 160310, 359443, 359449, G03B 2156, A47H 100, E06B 908

Patent

active

053531523

ABSTRACT:
A screen projection apparatus includes a housing within which a pair of projection screens are stored in a rolled position on motor driven rollers. A pair of access doors are mounted on the housing and support an idler roller over which a screen passes. The access doors open, one at a time, and the idler roller ensures that each of the screens when unrolled hangs in a common plane thereby eliminating the need to refocus the optical projection equipment which is used with the apparatus.

REFERENCES:
patent: 4045123 (1977-08-01), Brown
patent: 4089361 (1978-05-01), Zeppmeisel
patent: 4159162 (1979-06-01), Christoffel
patent: 4369829 (1983-01-01), Casiday
patent: 4679406 (1987-07-01), Weiblen
patent: 4951730 (1990-08-01), Hsu
patent: 5140461 (1992-08-01), Blood et al.

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