3 AXC patents covering its Keepered Media technology:
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United States Patent 5,041,922 Wood, et. al.Aug. 20, 1991
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Magnetic recording medium having magnetic storage and saturable layers, and apparatus and method using the medium
Inventors: Wood; Roger W. (Gilroy, CA); Gooch; Beverley R. (Sunnyvale, CA); Niedermeyer; Rex (Redwood City, CA). Assignee: Ampex Corporation (Redwood City, CA). Appl. No.: 555,811Filed: Jul. 23, 1990-
Abstract
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Magnetic record media are described that have an overlying or underlying magnetically saturable high permeability keeper layer in addition to a high coervicity magnetic layer in which magnetic signals are stored. These media are used in magnetic signal processing devices whose transducers are capable of generating a keeper layer-saturating bias flux. In signal reproduction the bias flux magnetically forms a saturation zone in the nature of virtual gap in the keeper layer that directs signal flux between the media and the transducer.
34 Claims, 8 Drawing Figures
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United States Patent 5,039,655 PisharodyAug. 13, 1991
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Thin film memory device having superconductor keeper for eliminating magnetic domain creep
Inventors: Pisharody; Raghavan K. (Palo Alto, CA). Assignee: Ampex Corporation (Redwood City, CA). Appl. No.: 387,202Filed: Jul. 28, 1989
Abstract
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A thin film magnetic array memory affords relatively high packing densities while avoiding the problem of magnetic domain creep through the use of thin films of superconducting material disposed on the work lines of the memory. The superconducting films shunt magnetic fields generated by currents carried within the word lines and prevent these fields from adversely affecting adjacent memory cells in the array. By constraining the magnetic fields with the use of the superconducting films, the word lines can be packed close to one another in the array structure, thereby increasing the amount of information that can be stored in a unit area of the array.
17 Claims, 4 Drawing Figures
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United States Patent 4,985,795 Gooch Jan. 15, 1991
Method and apparatus using a stationary magnetic body for effecting signal transfers between a moving magnetic core and a magnetic storage medium
Inventors: Gooch; Beverley R. (Sunnyvale, CA). Assignee: Ampex Corporation (Redwood City, CA). Appl. No.: 128,115Filed: Aug. 6, 1987
Related U.S. Application Data
Continuation-in-part of Ser No. 843,453, Mar. 24, 1986, Ser. No 829,592, Feb. 13, 1986, Ser. No 715,211, Mar. 22, 1985, abandoned, Ser. No 808,588, Dec. 13, 1985, abandoned and Ser No. 808,924, Dec. 13, 1985, abandoned, said Ser. No. 715,211is a continuation-in-part of Ser. No. 641,817, Aug. 16, 1984, abandoned, said Ser. No. 829,592is a continuation-in-part of Ser. No. 641,817, said Ser. No. 843,453is a continuation-in-part of Ser. No. 829,592, Ser. No 715,211, Ser. No 808,568 and Ser No. 808,924.
Abstract
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Magnetic transducer-keeper combination embodiments of the invention are described. Each has a magnetic core defining a physical gap and a thin magnetic keeper arranged in close proximity of the core to bridge the gap. A magnetic flux from the gap saturates the keeper inan area bridging the gap, thereby forming a signal transducing zone in the keeper. The keeper is maintained stationary and the core moved or scanned with respect to the same, thereby moving or scanning the transducing zone in the keeper.
49 Claims, 8 Drawing Figures
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