US3750154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bubble domain chip arrangement
Assignee: International Business Machines Corp
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Filing: 1972-05-01
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Granted: 1973-07-31
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Expires: 1992-05-01
Abstract
Abstract A space displacement arrangement of magnetic domain chips with respect to each other, which allows packaging with a minimum number of memory interconnections and low operating power. In addition, reduction of the number of preamplifiers and the number of sensors is achieved. Each chip contains bubble domain devices thereon, and provides a complete bubble domain memory system. Spatially rotating the chips with respect to one another means that the same reorienting magnetic drive field will have a time displaced effect on each of the chips. That is, each chip will see the reorienting drive field at a different time. In this manner, multiplexing on a chip-to-chip basis is achieved. The chips can be arranged so that no interconnection cross-overs result, even though they are rotationally displaced with respect to one another.
Inventors
- 👤 G Almasi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:11
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
106 words
A magnetic bubble domain memory, comprising: a plurality of magnetic chips eAch of which includes a magnetic sheet in which said bubble domains exist and overlay elements adjacent thereto for manipulation of domains in said sheet in accordance with the orientation of a magnetic field substantially in the plane of said magnetic sheet, said chips being rotationally oriented along a plurality of different directions defined by said magnetic field, drive field means for providing said magnetic field substantially in the plane of said magnetic sheet for manipulation of domains in the magnetic sheet of each magnetic chip in accordance with the orientation of said magnetic field.
Claim 2
Dependent Claim
106 words
A magnetic bubble domain memory, comprising: a plurality of magnetic chips eAch of which includes a magnetic sheet in which said bubble domains exist and overlay elements adjacent thereto for manipulation of domains in said sheet in accordance with the orientation of a magnetic field substantially in the plane of said magnetic sheet, said chips being rotationally oriented along a plurality of different directions defined by said magnetic field, drive field means for providing said magnetic field substantially in the plane of said magnetic sheet for manipulation of domains in the magnetic sheet of each magnetic chip in accordance with the orientation of said magnetic field.
Claim 3
Dependent Claim
14 words
The memory in claim 1, wherein said magnetic field is a rotating magnetic field.
Claim 4
Dependent Claim
37 words
The memory of claim 2, wherein there are four of said magnetic chips arranged so that each is rotated approximately 90* with respect to a different one of the remaining chips in the group of four chips.
Claim 5
Dependent Claim
16 words
The memory of claim 3, where said overlay elements are comprised of a magnetically soft material.
Claim 6
Dependent Claim
10 words
The memory of calim 4, where said material is permalloy.
Claim 7
Dependent Claim
10 words
The memory of calim 4, where said material is permalloy.
Claim 8
Dependent Claim
14 words
The memory of claim 1, where said magnetic chips are identical to one another.
Claim 9
Dependent Claim
23 words
The memory of claim 1, further including means for producing a magnetic bias field substantially normal to the plane of said magnetic sheets.
Claim 10
Dependent Claim
102 words
A memory unit using magnetic bubble domains, comprising: a plurality of magnetic memory chips, each of which includes: a magnetic sheet in which said domains exist, storage means adjacent said sheet for storage of said domains within said sheet, domain input means for providing patterns of said domains, sensing means for detection of said domains in said sheet, magnetic drive field means for providing a reorienting magnetic field substantially in the plane of each said magnetic sheet, wherein said magnetic chips are spatially rotated with respect to one another, each chip being oriented along a different orientation of said magnetic drive field.
Claim 11
Dependent Claim
102 words
A memory unit using magnetic bubble domains, comprising: a plurality of magnetic memory chips, each of which includes: a magnetic sheet in which said domains exist, storage means adjacent said sheet for storage of said domains within said sheet, domain input means for providing patterns of said domains, sensing means for detection of said domains in said sheet, magnetic drive field means for providing a reorienting magnetic field substantially in the plane of each said magnetic sheet, wherein said magnetic chips are spatially rotated with respect to one another, each chip being oriented along a different orientation of said magnetic drive field.
Claim 12
Dependent Claim
21 words
The memory unit of claim 8, where said storage means and said domain generation means are comprised of magnetically soft materials.
Claim 13
Dependent Claim
22 words
The unit of claim 8, further including bias field means for producing a magnetic bias field substantially normal to said magnetic sheet.
Claim 14
Dependent Claim
14 words
The unit of claim 8, where said magnetic chips are identical to one another.
Claim 15
Dependent Claim
30 words
The unit of claim 8, where these are four magnetic chips oriented in a tetrad arrangement, said chips being rotated along four mutually perpendicular directions of said reorienting magnetic field.
Claim 16
Dependent Claim
107 words
A memory unit using magnetic bubble domains, comprising: a plurality of magnetic chips comprising a group of said chips, each of which includes a magnetic sheet in which said domains exist, and magnetically soft elements adjacent said magnetic sheet for manipulation of said domains in said sheet in accordance with the orientation of a magnetic field substantially in the plane of said magnetic sheet, said elements being oriented identically in each said magnetic chip, wherein each said chip is rotationally displaced with respect to other chips in said group, and magnetic field means for producing said reorienting magnetic field substantially in the plane of said magnetic sheets.
Claim 17
Dependent Claim
107 words
A memory unit using magnetic bubble domains, comprising: a plurality of magnetic chips comprising a group of said chips, each of which includes a magnetic sheet in which said domains exist, and magnetically soft elements adjacent said magnetic sheet for manipulation of said domains in said sheet in accordance with the orientation of a magnetic field substantially in the plane of said magnetic sheet, said elements being oriented identically in each said magnetic chip, wherein each said chip is rotationally displaced with respect to other chips in said group, and magnetic field means for producing said reorienting magnetic field substantially in the plane of said magnetic sheets.
Claim 18
Dependent Claim
15 words
The unit of claim 13, wherein all magnetic sheets are substantially in the same plane.
Claim 19
Dependent Claim
11 words
The unit of claim 13, wherein all magnetic chips are identical.
Claim 20
Dependent Claim
22 words
The unit of claim 13, further including bias field means for producing a magnetic bias field substantially normal to said magnetic sheets.
Claim 21
Dependent Claim
16 words
The unit of claim 13, where there are a plurality of said groups of magnetic chips.
Claim 22
Dependent Claim
20 words
The unit of claim 13, further including a single sense amplifier associated with all of said chips in each group.
Claim 23
Dependent Claim
12 words
The unit of claim 13, where said elements are comprised of permalloy.
Claim 24
Dependent Claim
42 words
The unit of claim 13, wherein there are four magnetic chips in each said group, each magnetic chip being displaced along a directIon of said reorienting magnetic field 90* rotationally displaced from at least one other direction of said reorienting magnetic field.
Claim 25
Dependent Claim
26 words
The unit of claim 13, further including drive circuits providing electrical inputs to a plurality of magnetic chips, said drive circuits being shared among said chips.
Claim 26
Dependent Claim
32 words
The unit of claim 21, further including a sense amplifier associated with said plurality of chips, said sense amplifier and said drive circuits being time multiplexed in operation with said magnetic chips.
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) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |