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AssigneesHitachi, Ltd., Brother Industries, Ltd.
InventorsYasukazu Morita, Yasuhiko Uehara, Hiromichi Yamada, Yoshimasa Hara
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There are disclosed a europium and terbium-coactivated phosphor having chemical composition formula (M.sub.l-x-y Eu.sub.x Tb.sub.y).sub.n D wherein M represent Y or Lu, D represents (Al.sub.l-z Ga.sub.z).sub.5 O.sub.12 in which z is defined by 0.ltoreq.z.ltoreq.1, or O.sub.2 S, x is defined by 0.0003.ltoreq.x.ltoreq.0.001, y is defined by 0.0003.ltoreq.y.ltoreq.0.002 and n is 2 or 3, and wherein when D is (Al.sub.l-z Ga.sub.z).sub.5 O.sub.12, M is Y, n is 3 and y is defined by 0.001.ltoreq.y.ltoreq.0.02, or when D is O.sub.2 S, n is 2, y is defined by 0.0003.ltoreq.y.ltoreq.0.005; a cathode ray tube for color copy or color print coated with said europium and terbium-coactivated phosphor; and a copy (printing) unit using said cathode tube.
A cathode ray tube comprising a phosphor surface formed of a single phosphor having a substantially equal light emission energy strength in each of three wavelength regions of 400 to 500 nm, 520 to 580 nm and 600 to 700 nm in the visible radiation region;
A cathode ray tube comprising a phosphor surface formed of a single phosphor having a substantially equal light emission energy strength in each of three wavelength regions of 400 to 500 nm, 520 to 580 nm and 600 to 700 nm in the visible radiation region;
Dependencies are inferred from the claim text.