Arc discharge lamp having improved performance.

摘要

An improved high intensity arc discharge lamp is disclosed having curved projection means included when a bowed shape arc discharge is being closed to preclude molten vitreous material from deforming the internal cavity. In this manner, the arc tube internal cavity (46) is more reliably shaped and sized with the discharge electrodes being more accurately positioned within the internal cavity. Such curved projection means (68),(70) are provided in each pinch seal region ((42),(44) of the arc tube and can be formed mechanically with the jaw members ordinarily employed for the pinch sealing operation.