Camera tube of vidicon style comprising single high melting-point metal seal provided with support for target

Claim 1

A camera tube including a transparent face plate and a tubular casing airtightly sealed together to form a vacuum envelope by sealing means having a first portion sealed to the periphery of said face plate, a second portion sealed to the adjacent end of said tubular casing, and a third portion disposed between said face plate and said tubular casing, said camera tube further including a ring member disposed around a target electrode and placed within said envelope adjacent to said face plate, an electron gun, and means for scanning electrons from said gun over said target electrode to deliver video signals to said sealing means, wherein the improvement comprises a single seal member of high melting-point metal as said sealing means, first means of high melting-point metal radially inwardly projecting from the inside surface of said third portion, and second means of resilient metal attached to the outer surface of said ring member for engaging with said first means to support said target electrode in juxtaposed relation to said face plate, said ring member being made of nonmagnetic metal.