US3858189A
Expired / Lapsed
US
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Magneto resistive signal multiplier for sensing magnetic bubble domains
Assignee: International Business Machines Corp
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Filing: 1972-12-29
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Granted: 1974-12-31
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Expires: 1992-12-29
Abstract
Abstract A plurality of magneto-resistive sensing elements are connected in series and positioned adjacent magnetic bubble domain propagation paths in a compressor circuit. If a data representing bubble is injected into the beginning of the circuit, each bubble already present is forced over to the next idler position. As the bubbles pass the sensing elements their magnetization vectors are rotated producing corresponding changes in the resistance values of the sensors, which may be easily detected as a large magnitude signal indicating the presence of a data bubble.
Inventors
- 👤 E Walker
- 👤 W Beausoleil
- 👤 G Keefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:34
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866; G01; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A circuit for sensing magnetic bubble domains including a magnetic medium capable of supporting single wall magnetic bubble domains, propagation means located on the magnetic medium and defining a plurality of bubble idler positions connected in a series string by a plurality of propagation means disposed between adjacent idler positions, comprising: a. a plurality of magneto-resistive sensing elements disposed adjacent the magnetic medium; b. each sensing element lying adjacent a propagation means disposed between adjacent idler positions; and c. means connecting the magneto-resistive sensing elements in series, whereby when magnetic bubble domains located at each idler position are caused to move to the next adjacent idler position in a given direction each such bubble produces a resistance change in an adjacent sensing element.
Claim 2
Dependent Claim
123 words
A circuit for sensing magnetic bubble domains including a magnetic medium capable of supporting single wall magnetic bubble domains, propagation means located on the magnetic medium and defining a plurality of bubble idler positions connected in a series string by a plurality of propagation means disposed between adjacent idler positions, comprising: a. a plurality of magneto-resistive sensing elements disposed adjacent the magnetic medium; b. each sensing element lying adjacent a propagation means disposed between adjacent idler positions; and c. means connecting the magneto-resistive sensing elements in series, whereby when magnetic bubble domains located at each idler position are caused to move to the next adjacent idler position in a given direction each such bubble produces a resistance change in an adjacent sensing element.
Claim 3
Dependent Claim
33 words
A circuit as defined in claim 1 further comprising a plurality of resistive elements, and means connecting the magneto-resistive sensing elements and the resistive elements in a bridge configuration to effect noise cancellation.
Claim 4
Dependent Claim
173 words
In a magnetic bubble domain apparatus comprised of a magnetic medium in which said bubble domains can be moved during application thereto of repetitive drive cycles of applied magnetic fields, a sensing means for detecting one of said magnetic bubble domains, comprising: a plurality of bubble domain storage positions for holding first bubble domains therein during cycles of said applied magnetic fields until said one bubble domain causes said first bubble domains to move from said storage positions, propagation means located between said storage positions for guiding said first bubble domains from one storage position to another when said one bubble domain causes one of said first bubble domains to move from its storage position, and sensing elements located adjacent to said propagation means for detecting said first bubble domains when said first bubble domains move from their storage positions in response to the presence of said one bubble domain, said sensing elements providing output signals which are combined to provide an amplified signal representative of the presence of said one bubble domain.
Claim 5
Dependent Claim
173 words
In a magnetic bubble domain apparatus comprised of a magnetic medium in which said bubble domains can be moved during application thereto of repetitive drive cycles of applied magnetic fields, a sensing means for detecting one of said magnetic bubble domains, comprising: a plurality of bubble domain storage positions for holding first bubble domains therein during cycles of said applied magnetic fields until said one bubble domain causes said first bubble domains to move from said storage positions, propagation means located between said storage positions for guiding said first bubble domains from one storage position to another when said one bubble domain causes one of said first bubble domains to move from its storage position, and sensing elements located adjacent to said propagation means for detecting said first bubble domains when said first bubble domains move from their storage positions in response to the presence of said one bubble domain, said sensing elements providing output signals which are combined to provide an amplified signal representative of the presence of said one bubble domain.
Claim 6
Dependent Claim
12 words
The apparatus of claim 3, where said sensing elements are connected together.
Claim 7
Independent Claim
156 words
An apparatus for sensing a data magnetic bubble domain in a magnetic medium, comprising: propagation means for moving bubble domains in said medium in a first direction in response to successive reorientations of a magnetic field substantially in the plane of said magnetic medium, means for preventing continual movement Of said domains in said first direction during successive reorientations of said magnetic field in the absence of said data bubble, input means for providing said data bubble domain to be detected, said input means including means for bringing said data bubble to said means for preventing causing said bubble domains to be pushed away from said means for preventing, sensing means for detecting said bubble domains when they move away from said means for preventing, said sensing means providing an additive output representing the simultaneous presence of a plurality of said bubble domains, thereby providing an amplified indication of the presence of said data bubble domain.
Claim 8
Independent Claim
156 words
An apparatus for sensing a data magnetic bubble domain in a magnetic medium, comprising: propagation means for moving bubble domains in said medium in a first direction in response to successive reorientations of a magnetic field substantially in the plane of said magnetic medium, means for preventing continual movement Of said domains in said first direction during successive reorientations of said magnetic field in the absence of said data bubble, input means for providing said data bubble domain to be detected, said input means including means for bringing said data bubble to said means for preventing causing said bubble domains to be pushed away from said means for preventing, sensing means for detecting said bubble domains when they move away from said means for preventing, said sensing means providing an additive output representing the simultaneous presence of a plurality of said bubble domains, thereby providing an amplified indication of the presence of said data bubble domain.
Claim 9
Independent Claim
136 words
An apparatus for sensing magnetic bubble domains in a magnetic medium, said apparatus including propagation means defining a plurality of bubble idlers, a plurality of sensing elements sufficiently removed from said idlers that bubble domains in said idlers will not be substantially detected by said sensing elements, input means for providing a data bubble domain to be sensed, said input means including means for injecting said data bubble domain into one of said idlers thereby causing bubble domains in each of said idlers to move from said idlers into positions sufficiently close to said sensing elements that said bubble domains will be detected by said elements to produce output signals, said sensing elements being connected in a manner that said output signals are combined to produce an amplified output signal representative of said data bubble domain.
Claim 10
Independent Claim
136 words
An apparatus for sensing magnetic bubble domains in a magnetic medium, said apparatus including propagation means defining a plurality of bubble idlers, a plurality of sensing elements sufficiently removed from said idlers that bubble domains in said idlers will not be substantially detected by said sensing elements, input means for providing a data bubble domain to be sensed, said input means including means for injecting said data bubble domain into one of said idlers thereby causing bubble domains in each of said idlers to move from said idlers into positions sufficiently close to said sensing elements that said bubble domains will be detected by said elements to produce output signals, said sensing elements being connected in a manner that said output signals are combined to produce an amplified output signal representative of said data bubble domain.
Claim 11
Dependent Claim
16 words
The apparatus of claim 6, where said sensing elements are magneto-resistive sensing elements connected in series.
References Cited (Backward Citations)
US3638208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |