Electric lamp and discharge devices – With gas or vapor – With particular gas or vapor
Patent
1997-08-28
1999-10-26
O'Shea, Sandra
Electric lamp and discharge devices
With gas or vapor
With particular gas or vapor
313640, 313641, 313642, 313546, 313638, 313643, H01J 1720
Patent
active
059734540
ABSTRACT:
A metal halide lamp in which the radiant efficiency is not adversely affected, in which outstanding color reproducibility is obtained, and which is suitable for a light source of an OHP or a direct projector is achieved, according to the invention, by the fact that, within an arc tube provided with a pair of electrodes, together with mercury and a starting rare gas, halides of dysprosium (Dy), yttrium (Y) and cesium (Cs) are encapsulated with the molar ratio of the encapsulated metals Dy to Y is being fixed in the range of 0.3.ltoreq.Dy/Y.ltoreq.1.0. In this way the green portion to which there is a sensitive visual reaction is reduced, the blue portion increased, and thus the color reproducibility is increased.
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Horikoshi Mitsuo
Ooyama Masachika
DelGizzi Ronald E.
O'shea Sandra
Safran David S.
Ushiodenki Kabushiki Kaisha
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