Magnetic head having an integrated recording and playback head and an erasure head
Patent 4774616 Issued on September 27, 1988. Estimated Expiration Date: 
September 27, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 27, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesComposite magnetic head structure and process for manufacturing the same Methods of making magnetic recording heads Magnetic head and method of fabricating same Composite substrate for a thin-film magnetic head Magnetic head assembly Patent #: 4642719 InventorsAssigneeApplicationNo. 06/694386 filed on 12/04/1984US Classes:360/118, Erase360/110, HEAD360/121, Plural gaps360/122, Head surface structure360/126LaminatedExaminersPrimary: Hecker, Stuart N.Assistant: Garcia, Alfonso Attorney, Agent or FirmInternational ClassG11B 5/265 (20060101)Foreign Application Priority Data1983-04-04 JPAbstractThe present invention relates to a magnetic head, which can form guard bands on a magnetic recording medium and which is especially suitable for magnetic discs, and a fabrication process thereof. The magnetic core of the present invention includes a recording and reproduction head core (31) and an erasure head core (32) which is integrally joined in series to the head core (31) for forming guard bands. Magnetic circuits are constructed of metallic magnetic materials (34), (34'), (35) and (35') formed on non-magnetic members (33) and (33'). As a result, a recording medium having high coercive forces can be recorded while the track width is reduced and the fabrication is facilitated with a high accuracy. | |
