Projection television apparatus

Details Projection television apparatus Projection television apparatus

1981-12-16

1984-06-05

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

Attribute control

358237, 358250, H04N 931

Patent

active

044531788

ABSTRACT:
A projection television apparatus having a retrofocus type projection lens system which has a sufficiently long back focus, a small F number and a large distortion. The lens system is constructed with five components and five lenses and comprises a first lens which is a negative meniscus lens that has at its screen side a convex surface, a second lens which is a biconvex lens, a third lens which is a biconcave lens, a fourth lens which is a positive lens, and a fifth lens which is a biconvex lens, and which is defined by the following four conditions, i.e.

REFERENCES:
patent: 2642487 (1953-06-01), Schroeder
patent: 3328111 (1967-06-01), Bennett et al.

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