ELECTRICITY LEAD-IN BODY FOR BULB AND METHOD FOR MANUFACTURING THE SAME

摘要

An electricity lead-in body for bulbs in which an electrode core rod (40) is inserted through a central hole of a closure body (50) made of a functionally gradient material containing a conductive inorganic component and an insulating inorganic component, wherein in a boundary region between the closure body (50) and the electrode core rod (40), a diffusion region in which the conductive inorganic component of the closure body (50), a metallic component of the electrode core rod (40), and a diffusion promoter (60) for promoting the diffusion of the conductive inorganic component and the metallic component at sintering temperature are diffused is formed, and consequently the electrode core rod (40) is joined to the conductive inorganic component. The closure body (50) and the electrode core rod (40) are firmly secured by sintering, thus causing no leak and preventing the electrode core rod (40) from coming off.