High-pressure discharge lamp

H - Electricity – 01 – J

Patent

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313/134

H01J 5/46 (2006.01) H01J 61/34 (2006.01) H01J 61/36 (2006.01)

Patent

CA 2037501

ABSTRACT OF THE DISCLOSURE: To prevent ion migration from a discharge vessel (4) into an evacuated space between the discharge vessel and an outer bulb (1), a shield wire (13) is interposed between the current supply lead (12) extending longitudinally within the outer bulb and the discharge vessel (4), and both the shield wire (13) and the current supply (12) are insulated by a high dielectric insulating material. A suitable material is a ceramic, like Al2O3 or Ba2TiO4, for example, as a single ceramic body with ducts for, respectively, the current supply lead (12) and the shielding wire (13), or, alternatively, to form separate ceramic sleeves (17, 18).

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