Sealed magnetic tape cartridge with transducer gas embedded within a wall of the cartridge

Claim 1

A completely sealed magnetic tape cartridge for operating with a read-record magnetic head means, the cartridge being inclosed by a nonmagnetic wall and having, in combination, magnetic gap means embedded within a predetermined portion of the nonmagnetic wall of the cartridge and with an outer surface of the gap means exposed for cooperating with the head means, the cartridge being internally provided with a supply of planar magnetic tape and with a pressure pad disposed in contiguous alignment with an inner surface of the gap means, said tape being juxtaposed with said gap means and said pressure pad at its opposite sides, respectively, and being pressed against said inner surface of said gap means by said pressure pad, drive roll means disposed within the cartridge in engagement with said tape for passing said tape between said pressure pad and said inner surface of the gap means, spring-biased pinch roll means urging said tape against said drive-roll means, and drive-coupling means connected with the drive-roll means said head means comprising a U-shaped core the arms of which are positioned adjacent to said outer surface of said gap means, said core being potted within a magnetically shielded case having a flat face at which the ends of said arms are exposed, said cartridge wall having a flat face through which said outer surface of the gap means is exposed and which mates with the said flat face of the case of said head means.