Patent US6184680B1 successfully refreshed from Google Patents.
US6184680B1
Expired / Lapsed
US
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Magnetic field sensor with components formed on a flexible substrate
Assignee: TDK Corp
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Filing: 1998-01-26
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Granted: 2001-02-06
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Expires: 2018-01-26
Abstract
Abstract A magnetic field sensor in which a magnetic film or films having a magnetoresistance effect for detecting a magnetic field and a conductor electrode film for applying a current to the magnetic film are deposited on a flexible substrate. Therefore, the magnetic field sensor deposited on the flexible substrate can be bent as desired. The magnetic film or films can be deposited on one face of the flexible substrate made of resin that is 5 to 300 μm thick while the other substrate face on the opposite side of the flexible substrate can be brought adjacent to a body inducing a change in a magnetic field that is undergoing detection. be deformed.
Inventors
- 👤 Osamu Shinoura
- 👤 Hideyuki Suzuki
- 👤 Yuichi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:59
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; B; B82; B82Y; B82Y25/00; G01R; G01R33/00; G01R33/02; G01R33/06; G01R33/09; G01R33/093; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
119 words
A magnetic field sensor comprising: a flexible polyimide film substrate; a magnetic film having a magnetoresistance effect formed in a detection area on said flexible polyimide film substrate and configured to permit close positioning of the detection area relative to a magnetic field changing body to detect changes in the magnetic field; and a conductor electrode film configured to apply a current to said magnetic film and having an external connection portion including outwardly projecting bonding portions positioned to be outside of the detection area so as to not limit close positioning of the detection area relative to the magnetic field changing body, wherein said magnetic film and said conductor electrode film are formed integrally of a same material.
Claim 2
Dependent Claim
119 words
A magnetic field sensor comprising: a flexible polyimide film substrate; a magnetic film having a magnetoresistance effect formed in a detection area on said flexible polyimide film substrate and configured to permit close positioning of the detection area relative to a magnetic field changing body to detect changes in the magnetic field; and a conductor electrode film configured to apply a current to said magnetic film and having an external connection portion including outwardly projecting bonding portions positioned to be outside of the detection area so as to not limit close positioning of the detection area relative to the magnetic field changing body, wherein said magnetic film and said conductor electrode film are formed integrally of a same material.
Claim 3
Dependent Claim
26 words
The magnetic field sensor according to claim 1 wherein the magnetic film having said magnetoresistance effect is a magnetic film which has a giant magnetoresistance effect.
Claim 4
Dependent Claim
29 words
The magnetic field sensor according to claim 1 wherein the magnetic film having said magnetoresistance effect is an antiferromagnetic-coupled type of magnetic film which exhibits a giant magnetoresistance effect.
Claim 5
Dependent Claim
60 words
The magnetic field sensor according to claim 1 wherein said flexible Polyimide film substrate is provided with at least one curved portion which is formed by a bending process in such a manner that the magnetic film for detecting the magnetic field and the external connecting portion formed on the conductor electrode film do not exist on the same plane.
Claim 6
Dependent Claim
41 words
The magnetic field sensor according to claim 1 wherein said flexible Polyimide film substrate is provided with a curved portion which is formed by a bending process for applying an external stress to the magnetic film to arbitrarily change magnetic properties.
Claim 7
Dependent Claim
132 words
A magnetic field sensor comprising: a flexible substrate; at least two magnetic films having a magnetoresistance effect formed in a detection area on said flexible substrate and configured to permit close positioning of the detection area relative to a magnetic field changing body to detect changes in the magnetic field; and a conductor electrode film configured to apply a current to said magnetic film and having an external connection portion including outwardly projecting bonding portions positioned to be outside of the detection area so as to not limit close positioning of the detection area relative to the magnetic field changing body, wherein said at least two magnetic films are disposed with a predetermined interval there between, said predetermined interval being adjustable by changing a curve or fold parameter of said flexible substrate.
Claim 8
Dependent Claim
132 words
A magnetic field sensor comprising: a flexible substrate; at least two magnetic films having a magnetoresistance effect formed in a detection area on said flexible substrate and configured to permit close positioning of the detection area relative to a magnetic field changing body to detect changes in the magnetic field; and a conductor electrode film configured to apply a current to said magnetic film and having an external connection portion including outwardly projecting bonding portions positioned to be outside of the detection area so as to not limit close positioning of the detection area relative to the magnetic field changing body, wherein said at least two magnetic films are disposed with a predetermined interval there between, said predetermined interval being adjustable by changing a curve or fold parameter of said flexible substrate.
Claim 9
Dependent Claim
24 words
The magnetic field sensor according to claim 6 wherein said magnetic films and said conductor electrode film are integrally formed of the same material.
Claim 10
Dependent Claim
31 words
The magnetic field sensor according to claim 1 or 6 wherein a protective film which is obtained by thermally treating polyimide resin or novolak resin is formed on said magnetic film.
Claim 11
Dependent Claim
20 words
The magnetic field sensor according to claim 1 or 6 which is used as a sensor for detecting a rotation.
Claim 12
Dependent Claim
107 words
A magnetic field sensor comprising: a flexible substrate having a first face and an oppositely directed second face; a thin-film pattern formed on said first face and configured to detect a magnetic field; and a heat radiating member with a thickness of 200 μm or more formed on said thin-film pattern, said heat radiating member having a thermal conductivity of 20 W·m −1 ·K −1 or more, wherein the flexible substrate is made of resin and has a thickness of 5 to 300 μm and the second face is configured to be disposed adjacent to a body having a characteristic that changes the magnetic field being detected.
Claim 13
Dependent Claim
107 words
A magnetic field sensor comprising: a flexible substrate having a first face and an oppositely directed second face; a thin-film pattern formed on said first face and configured to detect a magnetic field; and a heat radiating member with a thickness of 200 μm or more formed on said thin-film pattern, said heat radiating member having a thermal conductivity of 20 W·m −1 ·K −1 or more, wherein the flexible substrate is made of resin and has a thickness of 5 to 300 μm and the second face is configured to be disposed adjacent to a body having a characteristic that changes the magnetic field being detected.
Claim 14
Dependent Claim
18 words
The magnetic field sensor according to claim 10 wherein said flexible substrate of resin is a polyimide film.
Claim 15
Dependent Claim
22 words
The magnetic field sensor according to claim 10 wherein the thickness of said flexible substrate of resin is 20 to 100 μm.
Claim 16
Dependent Claim
22 words
The magnetic field sensor according to claim 10 wherein said thin-film pattern for detecting the magnetic field is a magnetoresistance effect film.
Claim 17
Dependent Claim
28 words
The magnetic field sensor according to claim 10 wherein said thin-film pattern for detecting the magnetic field is a giant magnetoresistance effect film constituted of a multilayered film.
Claim 18
Dependent Claim
26 words
The magnetic field sensor according to claim 10 wherein said flexible substrate of resin has a thin film of an inorganic material on a surface thereof.
References Cited (Backward Citations)
US4949039A
Cited
JPH02195284A
Cited
US5569544A
Cited
US5617071A
Cited
US5595830A
Cited
JPH07153034A
Cited
US5916694A
Cited
JPH07273385A
Cited
US5508611A
Cited
US5644230A
Cited
JPH08184463A
Cited
JPH08201492A
Cited
US5631557A
Cited
US5904996A
Cited
US5861747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-02-06 | 2004-08-07 | 2005-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-02-06 | 2008-08-07 | 2009-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-02-06 | 2012-08-07 | 2013-02-06 | $7700.00 | Window Closed / Lapsed |