US3760387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bubble domain system using multiple magnetic sheets
Assignee: International Business Machines Corp
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Filing: 1972-06-22
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Granted: 1973-09-18
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Expires: 1992-06-22
Abstract
Abstract A magnetic bubble domain system in which a single magnetic sheet, or a plurality of magnetic sheets, is used only for storage of information, while another magnetic sheet (memory sheet) is used for writing information into the storage magnetic sheet and for reading information from the storage magnetic sheet. The memory sheet contains circuitry for such functions as generation, decoding, sensing, clearing, storage, etc. The memory sheet can be positionally displaced with respect to the storage sheet to create bubble domains in the storage sheet and to detect the presence and absence of domains in the storage sheet. Means are provided to directly map information from the storage sheet to the memory sheet. Thus, this magnetic subsystem provides storage in a first magnetic sheet while the transducer circuits are in a second magnetic sheet which can be positionally displaced with respect to the first magnetic sheet for access of information into and from the first magnetic sheets.
Inventors
- 👤 H Chang
- 👤 G Fan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:51
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
115 words
A magnetic bubble domain apparatus, comprising: a first magnetic sheet in which said domains exist, said first sheet having a plurality of magnetic storage positions therein, the presence and absence of domains in said storage positions being indicative of information, a second magnetic sheet in which said domains can exist, said second magnetic sheet having thereon: write components for generating domains in selected positions of said first magnetic sheet thereby writing information into storage, and read components for detecting the presence and absence of domains at selected positions in said first magnetic sheet, displacement means for positioning said first and second magnetic sheets relative to one another for performance of said read and write functions.
Claim 2
Dependent Claim
115 words
A magnetic bubble domain apparatus, comprising: a first magnetic sheet in which said domains exist, said first sheet having a plurality of magnetic storage positions therein, the presence and absence of domains in said storage positions being indicative of information, a second magnetic sheet in which said domains can exist, said second magnetic sheet having thereon: write components for generating domains in selected positions of said first magnetic sheet thereby writing information into storage, and read components for detecting the presence and absence of domains at selected positions in said first magnetic sheet, displacement means for positioning said first and second magnetic sheets relative to one another for performance of said read and write functions.
Claim 3
Dependent Claim
31 words
The apparatus of claim 1, where said write component is comprised of a conductor loop located on said second magnetic sheet for creation of magnetic fields coupling said first magnetic sheet.
Claim 4
Dependent Claim
49 words
The apparatus of claim 1, where said write component is comprised of propagation means for moving domains in said second magnetic sheet into close proximity to one another, the net magnetic field produced by said domains in said second sheet providing a magnetic field coupling said first magnetic sheet.
Claim 5
Dependent Claim
35 words
The apparatus of claim 1, where said first magnetic sheet has domain generators thereon, and said second magnetic sheet has a control means thereon for controlling the generation of domains in said first magnetic sheet.
Claim 6
Dependent Claim
29 words
The apparatus of claim 1, including transfer means for transferring information represented as the presence and absence of domains in said first magnetic sheet to said second magnetic sheet.
Claim 7
Dependent Claim
26 words
The apparatus of claim 5, where said transfer means is comprised of an overlay of magnetically soft elements located in juxtaposition to said second magnetic sheet.
Claim 8
Dependent Claim
23 words
The apparatus of claim 5, where said overlay includes magnetically soft elements for propagation of domains in said first and second magnetic sheets.
Claim 9
Dependent Claim
26 words
The apparatus of claim 1, including a propagation means for moving domains in said first magnetic sheet, said propagation means being adjacent said first magnetic sheet.
Claim 10
Dependent Claim
26 words
The apparatus of claim 1, where said second magnetic sheet has propagation means assOciated therewith for movement of domains in said first and second magnetic sheets.
Claim 11
Dependent Claim
37 words
The apparatus of claim 9, where said propagation means is an overlay of magnetically soft elements adjacent said second sheet, said apparatus further including magnetic field means for producing a reorienting magnetic field coupling said overlay elements.
Claim 12
Dependent Claim
22 words
The apparatus of claim 1, where said second magnetic sheet has means thereon for decoding, generation, and storage of bubble domains therein.
Claim 13
Dependent Claim
73 words
A bubble domain apparatus, comprising: at least one storage magnetic sheet for storage of magnetic bubble domains at selected areas therein, a second magnetic sheet in which magnetic bubble domains can exist, said second sheet having circuitry thereon for creation of magnetic fields which couple said storage magnetic sheet, displacement means for positioning said storage magnetic sheet and second magnetic sheet sufficiently close that said magnetic fields couple to said storage magnetic sheet.
Claim 14
Dependent Claim
73 words
A bubble domain apparatus, comprising: at least one storage magnetic sheet for storage of magnetic bubble domains at selected areas therein, a second magnetic sheet in which magnetic bubble domains can exist, said second sheet having circuitry thereon for creation of magnetic fields which couple said storage magnetic sheet, displacement means for positioning said storage magnetic sheet and second magnetic sheet sufficiently close that said magnetic fields couple to said storage magnetic sheet.
Claim 15
Dependent Claim
30 words
The apparatus of claim 12, where said storage magnetic sheet and said second magnetic sheet are located within about a bubble domain radius of each other, in substantially parallel planes.
Claim 16
Dependent Claim
27 words
The apparatus of claim 12, where said second magnetic sheet has means thereon for moving domains in said storage magnetic sheet and in said second magnetic sheet.
Claim 17
Dependent Claim
41 words
The apparatus of claim 12, where said second magnetic sheet has thereon transfer means for producing a magnetic domain in said second magnetic sheet whose stray magnetic field couples with the stray magnetic field of a domain in said storage sheet.
Claim 18
Dependent Claim
37 words
The apparatus of claim 15, where said transfer means is comprised of an overlay of magnetically soft elements, and a magnetic field source for providing a reorienting magnetic field in the plane of said second magnetic sheet.
Claim 19
Dependent Claim
28 words
The apparatus of claim 12, including means for moving domains in selected areas of said storage sheet to positions where they interact with domains in said second sheet.
Claim 20
Dependent Claim
32 words
The apparatus of claim 12, where said circuitry includes current carrying control loops located on said second magnetic sheet for producing magnetic fields which couple to bubble domains in said storage sheet.
Claim 21
Dependent Claim
47 words
The apparatus of claim 12, where said storage sheet has magnetically soft elements thereon and said second sheet has writing means thereon for creating magnetic fields localized near said elements on said storage sheet for nucleation of domains within said storage sheet at locations near said elements.
Claim 22
Dependent Claim
54 words
The apparatus of claim 19, where said writing means is comprised of propagation means located adjacent said second sheet for bringing together a plurality of domains in said second sheet, the combined stray magnetic field of said domains in said second sheet producing said localized magnetic field at said elements on said storage sheet.
Claim 23
Dependent Claim
18 words
The apparatus of claim 19, where said write means comprises current carrying loops adjacent said second magnetic sheet.
Claim 24
Dependent Claim
98 words
A magnetic bubble domain apparatus, comprising: a first magnetic sheet in which said bubble domains can exist at a plurality of storage areas therein, a second magnetic sheet in which bubble domains can exist, displacement means for positioning said first and second magnetic sheets with respect to one another, writing means for creating magnetic bubble domains at selected locations in said first magnetic sheet, reading means for detecting domains located in said first magnetic sheet, transfer means for producing a domain pattern in said second magnetic sheet in accordance with a domain pattern in said first magnetic sheet.
Claim 25
Dependent Claim
98 words
A magnetic bubble domain apparatus, comprising: a first magnetic sheet in which said bubble domains can exist at a plurality of storage areas therein, a second magnetic sheet in which bubble domains can exist, displacement means for positioning said first and second magnetic sheets with respect to one another, writing means for creating magnetic bubble domains at selected locations in said first magnetic sheet, reading means for detecting domains located in said first magnetic sheet, transfer means for producing a domain pattern in said second magnetic sheet in accordance with a domain pattern in said first magnetic sheet.
Claim 26
Dependent Claim
18 words
The apparatus of claim 22, further including first propagation means for moving domains in said first magnetic sheet.
Claim 27
Dependent Claim
17 words
The apparatus of claim 22, where said first propagation means is located adjacent said second magnetic sheet.
Claim 28
Dependent Claim
18 words
The apparatus of claim 22, further including second propagation means for mOving domains in said second magnetic sheet.
Claim 29
Dependent Claim
36 words
The apparatus of claim 22, where said transfer means includes means for bringing domains in said first sheet into transfer positions in said first sheet where said domains magnetically couple to domains in said second sheet.
Claim 30
Dependent Claim
34 words
The apparatus of claim 26, where said transfer means includes an overlay of magnetically soft elements located adjacent said second sheet, and a means for providing a reorienting magnetic field coupling said overlay elements.
Claim 31
Dependent Claim
37 words
The apparatus of claim 22, where said writing means includes means located adjacent said second sheet for creating magnetic fields at selected locations in said first magnetic sheet for nucleation of bubble domains at said selected locations.
Claim 32
Dependent Claim
18 words
The apparatus of claim 28, where said means for creating magnetic fields is a current carrying control loop.
Claim 33
Dependent Claim
53 words
The apparatus of claim 28, where said means for creating magnetic fields is comprised of means for providing at least two magnetic domains sufficiently close to one another in said second sheet that the combined stray magnetic field of said domains is sufficient to nucleate a bubble domain in said first magnetic sheet.
Claim 34
Dependent Claim
22 words
The apparatus of claim 22, where said writing means includes magnetically soft elements adjacent said first magnetic sheet at said selected locations.
Claim 35
Dependent Claim
25 words
The apparatus of claim 22, where said writing means includes a heat means for providing heat at said selected locations in said first magnetic sheet.
Claim 36
Dependent Claim
23 words
The apparatus of claim 22, including bias means for stabilizing the size of said bubble domains in said first and second magnetic sheets.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |