Patent US4315583A successfully refreshed from Google Patents.
US3909809A
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Magnetic bubble domain sensing device
Assignee: McMaster University
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Filing: 1973-12-17
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Granted: 1975-09-30
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Expires: 1993-12-17
Abstract
Abstract The sensing of magnetic bubble-domains is presently carried out using one of four techniques: inductive, magnetooptic, galvanomagnetic and magnetoresistive sensing. These techniques have a number of drawbacks such as size, complexity or inadequate sensitivity. The present invention provides for the sensing of bubble domains by first converting the energy associated with the bubble magnetic field to mechanical energy, and secondly by converting the mechanical energy to electrical energy which provides an electrical signal indicating the presence of a bubble domain. This method is carried out in a sensing device having a layer of magnetostrictive material in which the magnetic field produces an elastic strain and a layer of piezoelectric material which is fixed to the magnetostrictive material and converts the mechanical energy to electrical energy.
Inventors
- 👤 Witold Kinsner
- 👤 Edward Della Torre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:35
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/02; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
56 words
A method of sensing magnetic bubble-domains in bubble supporting material comprising: converting the magnetic energy in a magnetic field caused by the presence of a bubble domain in a bubble-supporting material, to mechanical energy; converting said mechanical energy to electrical energy; and detecting said electrical energy to provide an indication of the presence of said bubble-domain.
Claim 2
Independent Claim
56 words
A method of sensing magnetic bubble-domains in bubble supporting material comprising: converting the magnetic energy in a magnetic field caused by the presence of a bubble domain in a bubble-supporting material, to mechanical energy; converting said mechanical energy to electrical energy; and detecting said electrical energy to provide an indication of the presence of said bubble-domain.
Claim 3
Independent Claim
67 words
A device for sensing magnetic bubble-domains in bubble supporting material comprising: first means for converting the magnetic energy in a magnetic field caused by the presence of a bubble-domain in said bubble supporting material, to mechanical energy; second means coupled to said first means for converting said mechanical energy to electrical energy; and third means for receiving said electrical energy to indicate the presence of said bubble-domain.
Claim 4
Independent Claim
67 words
A device for sensing magnetic bubble-domains in bubble supporting material comprising: first means for converting the magnetic energy in a magnetic field caused by the presence of a bubble-domain in said bubble supporting material, to mechanical energy; second means coupled to said first means for converting said mechanical energy to electrical energy; and third means for receiving said electrical energy to indicate the presence of said bubble-domain.
Claim 5
Dependent Claim
49 words
A device as claimed in claim 2 wherein: the first means consists of a thin layer of magnetostrictive material having predetermined configuration, fixed to said supporting material; and the second means consists of a thin layer of piezoelectric material fixed to and at least partially surrounding the magnetostrictive material.
Claim 6
Dependent Claim
34 words
A device as claimed in claim 2 wherein said first means consists of a thin glass substrate fixed to said supporting material; and a thin layer of magnetostrictive material fixed to said glass substrate.
Claim 7
Dependent Claim
47 words
A device as claimed in claim 2 wherein: said bubble-domain supporting material consists of magnetostrictive material to form said first means for converting the magnetic energy to mechanical energy; and said second means consists of a thin layer of piezoelectric material fixed to said bubble supporting material.
Claim 8
Dependent Claim
23 words
A device as claimed in claim 2 wherein: said first meaNs includes a magnetostrictive material; and said second means includes a piezoelectric material.
Claim 9
Dependent Claim
22 words
A device as claimed in claim 6 wherein: said magnetostrictive material is a Ni-Fe alloy having 45 to 68% Ni in Fe.
Claim 10
Dependent Claim
32 words
A device as claimed in claim 6 wherein the piezoelectric material is one of the group consisting of BaTiO3, PZT ceramic, PbTiO3-PbZkO3, Pb(Me'' Me'''') O3-PbTiO3-PbZrO3, Pb(Mr1/3Sb2/3)O3-PbTiO3-PbZrO3, (NaBi)TiO3- (NaBi)ZrO3 PbTiO3-PbZrO3, CdS or ZnO.
Claim 11
Dependent Claim
41 words
A device as claimed in claim 2 wherein: the first means consists of a thin layer of magnetostrictive material fixed to said supporting material; and the second means consists of a thin layer of piezoelectric material fixed to said magnetostrictive material.
Claim 12
Dependent Claim
26 words
A device as claimed in claim 9 wherein said third means includes first and second spaced electrical contacts; said contacts being fixed to the piezoelectric material.
Claim 13
Dependent Claim
36 words
A device as claimed in claim 9 wherein said third means includes first and second electrical contacts: said first contact being fixed to the piezoelectric material and said second contact being fixed to the magnetostrictive material.
References Cited (Backward Citations)
US3735369A
Cited
US3825910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |