Ampex Corporation

Beverly R Gooch

Rex Niedermeyer

A magnetic transducer is batch fabricated from a pair of confronting elongate composite block substrates each formed of a thin cap of non-magnetic material bonded to a much larger block of magnetic material, such as ferrite. An intermediate winding groove is formed in proximate relation to the non-magnetic material along the length of one or both composite block substrates. One (or both) of the substrates is provided with a plurality of parallel spaced V-shaped grooves oriented in a direction perpendicular to the winding groove, wherein adjacent grooves form therebetween track width defining [prtopms. A core layer of high permeability magnetic material, such as Alfesil material, is deposited over the edges whereby magnetic poles are formed of the edges. A gap layer of insulating material is deposited on the edges over the high permeability magnetic material. Two of the composite block substrates are placed with the edges in aligned abutting relation and are assembled by glass bonding. Individual transducers are sliced from the bonded assembly of substrates and are lapped and polished and a coil is added to provide the finished transducers. Alternative embodiments may employ winding and V-shaped grooves in only one composite block substrate with the matching substrate being flat, and/or may employ either rectangular solid or wedge-shaped non-magnetic caps bonded to the ferrite blocks.

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Sunnyvale, CA, United States of America

Beverly R Gooch