Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-01-11
1983-12-27
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358 60, 358237, 358238, 358239, H04N 574, H04N 931
Patent
active
044234384
ABSTRACT:
A projection cathode ray tube is provided with elements for correcting a spherical aberration in the optical system. These elements include a correction lens disposed in front of the tube and a masking member adjustably mounted on the lens. The masking member partially covers peripheral surface portions of the lens in an adjustable manner to obtain a high image resolution on the screen with a minimum decrease in the image brightness. Preferably, the masking member is removable or adjustable in the form of a masking tape or divided shutter attached to partial portions of the front face of the lens for removing an undesired aberration with a minimized shuttering area. The projection tube comprises in combination with the correction lens, a tube envelope including a convex target and a concave mirror disposed opposite to each other and having the same center of curvature. This structure with the adjustable masking achieves a high quality reception or image projection.
REFERENCES:
patent: 2482566 (1949-09-01), Traub
patent: 2567745 (1951-09-01), Trad
patent: 3969648 (1976-07-01), Hergenrother
patent: 4024579 (1977-05-01), Hergenrother
Fasse W. G.
Kane, Jr. D. H.
Masinick Michael A.
NEC Kansai, Ltd.
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