Dynamic magnetic information storage or retrieval – Head – Flux scanning
Patent
1987-08-06
1992-10-06
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Head
Flux scanning
360119, 360122, 360125, G11B 5187, G11B 523, G11B 5127
Patent
active
051537966
DESCRIPTION:
BRIEF SUMMARY
Cross-reference is hereby made to the following U.S. patent applications: United States National Application Ser. No. 07/100,816 filed Aug. 6, 1987, which is based upon and entitled to the benefit of the effective filing date of Patent Cooperation Treaty Application No. PCT/U.S. 86/02732, entitled MAGNETIC RECORD MEDIUM HAVING DISCRETE MAGNETIC STORAGE AND SATURABLE LAYERS AND MAGNETIC SIGNAL PROCESSING APPARATUS AND METHOD USING THE MEDIUM filed concurrently herewith, abandoned in favor of continuation application Ser. No. 07/555,811 filed Jul. 23, 1990, now U.S. Pat. No. 5,041,922; and U.S. National Application Ser. No. 07/128,115 filed Aug. 6, 1987, which is based upon and entitled to the benefit of the effective filing date of Patent Cooperation Treaty Application, entitled METHOD AND APPARATUS USING A STATIONARY SATURABLE MEMBER FOR TRANSFERRING SIGNALS RELATIVE TO A MAGNETIC STORAGE MEDIUM filed concurrently herewith, now U.S. Pat. No. 4,985,795.
All of the above-identified patent applications are assigned to Ampex Corporation, assignee of this patent application.
This invention relates in general to magnetic recording and reproducing and, more particularly, to the provision of a body of magnetic material to provide a signal transfer or transducing zone for the transference of magnetically defined information between a signal utilization device and a magnetic storage medium. It more specifically relates to the control of the location of a signal transfer or transducing zone in such an additional body of magnetic material. (By "signal transfer zone" or "transducing zone" as used herein, is meant a zone responsible for coupling magnetic flux to or from the body having the zone). The preferred embodiments of the invention described here relate to the use of the physical transducing gap of an electromagnetic transducer to establish a transducing zone in a magnetically saturable body proximate the physical path of a magnetic storage medium. In certain of the preferred embodiments, the location in the body of the transducing zone is varied.
There are many instances in which it is desirable to transfer magnetically defined information between a magnetic storage medium and a signal utilization device using an electromagnetic transducer which converts the magnetic state definition of the information into an electrical definition of the same. An electromagnetic transducer typically has a body of high permeability magnetic material that is provided with a physical gap (generally referred to as a transducing gap) between two magnetic poles. This gap interrupts the flux path within the transducer to permit coupling of flux from and to the flux path. Flux is coupled from the flux path within the transducer to, for example, a magnetic storage medium by fringing from the body of magnetic material at the gap. The gap also enables the head to "pick-up" (detect) magnetic flux which fringes from a properly positioned magnetic storage medium. Signal means are provided to sense the picked-up flux flowing in the flux path and transmit the information defined by the magnetic flux to a desired signal utilization device. The signal means typically is an electrical coil positioned to detect changes in the flux threading the flux path and convert the magnetically defined information to a corresponding electrical signal. (It will be appreciated that although this detection is transfer of information in one direction, i.e., from a magnetic medium to a magnetic transducer or head, transfer in the other direction, i.e., from a magnetic head to a corresponding magnetic storage medium, is, broadly speaking, quite similar. The information is converted from an electrical signal manifestation to a magnetic state manifestation by passing an electrical signal defining the same through the coil which induces corresponding magnetic flux on the flux path within the head.) This technology is used in disc recorders that have rigid magnetic disc storage media. The electromagnetic transducer of such an arrangement is made to "fly" (be out-of-med
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Ampex Corporation
LaBarre James A.
Mossino Ralph L.
Tupper Robert S.
Zimmerman C. Michael
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