Browse Prior Art Database

Magnetic Transducer Head

IP.com Disclosure Number: IPCOM000095921D
Original Publication Date: 1964-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Morrison, JR: AUTHOR [+2]

Abstract

The useful life of both magnetic transducer heads and magnetic recording material is greatly improved by vacuum deposition of smooth non-ferromagnetic material upon the pole faces of the head.

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Magnetic Transducer Head

The useful life of both magnetic transducer heads and magnetic recording material is greatly improved by vacuum deposition of smooth non-ferromagnetic material upon the pole faces of the head.

Laminated magnetic transducer head 2 is shown in fragmentary prospective view. Head 2 consists of laminations 4 insulated from one another by insulating material 6. Non-magnetic gap shim 8 resides within the transducing gap of head
2. Vacuum deposited non-ferromagnetic overlayer 12 is secured upon and supported by the pole faces and shim 8 of head 2. Overlayer 12 is of optimum thickness so as to prevent wear of the pole faces while maintaining loss of the produced and reproduced signals within an acceptable range. The coated head thus presents a smooth continuous nonabrasive surface to magnetic recording material, e. g. , magnetic tape, not shown. Overlayer 12 can consist of chromium or any other non-ferromagnetic material of low permeability, although it is preferably a mechanically hard and well-wearing substance.

At the broken away right-hand portion of head 2, laminated transducers tend to present an especially uneven surface to magnetic recording material. Such uneven surfaces can have a devastating effect on magnetic recording material, especially at the exposed transducer gap. Overlayer 12 eliminates the uneven contact surface and gap, thus eliminating a major source of wear and damage to the magnetic recording material. Non-laminated heads a...