Electric lamp and discharge devices: systems – Discharge device load
Patent
1982-05-07
1985-06-18
Dixon, Harold
Electric lamp and discharge devices: systems
Discharge device load
315276, 315357, 313620, 313631, 313639, H01J 1104
Patent
active
045243069
ABSTRACT:
An extra-high pressure mercury discharge lamp comprising an end-sealed glass tube shaped to provide a long arc type tube, mercury contained in the both ends respectively of the glass tube, a pair of electrodes provided in the both ends respectively of the glass tube, each of the electrodes including one end portion extending toward the exterior from the associated end of the glass tube, an intermediate portion immersed in the mercury, and the other end portion extending toward the interior beyond the surface of the mercury facing toward the middle of the glass tube, and a power source connected between the externally extending portions of the electrode pair to supply power thereacross, the other or internally extending portions of the electrode pair having a length so selected that the mercury discharge lamp emits light of a sharp emission profile suitable for the exposure of a very fine pattern.
REFERENCES:
patent: 997882 (1911-01-01), Weintraub
patent: 1064686 (1913-06-01), Hewitt
patent: 1091563 (1914-03-01), Dempster
patent: 1116480 (1914-01-01), Podszus
patent: 1188578 (1916-06-01), Thomas
patent: 1656898 (1928-01-01), Belleaud et al.
patent: 1900138 (1933-03-01), Torrisi
patent: 2198513 (1940-04-01), Knoop
patent: 2329124 (1943-09-01), Lemmers
patent: 2329125 (1943-09-01), Lemmers
Fujimura Takashi
Nishizawa Masahiro
Dixon Harold
Hitachi , Ltd.
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