Electricity introducing member for vessels

Abstract

An electricity introducing member for a tube lamp includes a closing member and an electrode upholding part formed integrally together; the closing member includes a plurality of layers each comprising a conductive component and silica, the volumetric proportion of the silica being n1, n2, n3, . . . , nx such that n1>n2>n3> . . . >nx, are successively laminated in the form of a cylinder, so that the closing member serves as a functional gradient material; where the diameter of the closing member is D in mm and the total thickness of the laminate of the layers each containing more than 80 volume % of silica is L in mm; L/D is not less than 2: the electrode upholding part is shrink-fitted from the surface on the side of the layer n1 up to the layer containing at most 80 volume % of silica in the closing member. Preferably, where the diameter of the electrode upholding part is d in mm, the ratio of d/D is from 0.12 to 0.6.

Dependencies are inferred from the claim text.