Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1986-12-31
1989-04-25
Corbin, John K.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
350412, 358239, 358250, G02B 1318, G02B 302, H04N 574, H04N 572
Patent
active
048242241
ABSTRACT:
An improved lens system for a projection television is described. The lens system is designed to be used with a cathode ray tube having a face glass with an aspheric surface having phosphor elements mounted thereto. The aspheric surface of the face glass has its maximum radius at the optical axis and is of lesser radius outwardly thereof. From the screen, the lens system companies a first aspheric lens of relatively weak power, a second biconvex lens of relatively high positive power, a third aspheric lens of weak positive power and a fourth lens having a concave face on its screen sider and of relatively large negative power.
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Fukuda Kyohei
Hirata Koji
Mori Shigeru
Sakurai Soichi
Yoshikawa Hiroki
Corbin John K.
Hitachi , Ltd.
Kachmarik Ronald M.
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