Patent US5193267A successfully refreshed from Google Patents.
US5193267A
Expired / Lapsed
US
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Method of manufacturing magnetostriction stress detectors
Assignee: Mitsubishi Electric Corp
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Filing: 1992-04-27
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Granted: 1993-03-16
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Expires: 2012-04-27
Abstract
Abstract A magnetostriction type stress detector including a passive member to which an external force is applied, which passive member is formed of a magnetic material; a magnetic shielding member provided around the passive member, which magnetic shielding member is formed with a plurality of slits; and a detection coil provided around the magnetic shielding member for detecting a change in magnetic permeability due to a stress in the passive member to be generated by the external force, through the slits of the magnetic shielding member.
Inventors
- 👤 Hiroshi Satoh
- 👤 Yoshihiko Utsui
- 👤 Katsuhiko Honda
- 👤 Masahiko Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:54
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/02; G01L3/04; G01L3/10; G01L3/101; G01L3/102; G01L3/103; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49073
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A method of manufacturing a magnetostriction stress detector, comprising the steps of forming a passive shaft to which an external force is applied, from a magnetic material having a high magnetic permeability and a soft magnetism; forming a slit for allowing passage of a magnetic flux through a magnetic shielding plate formed of a nonmagnetic material having a high conductivity; winding said magnetic shielding plate around said passive shaft; fixing said magnetic shielding plate to said passive shaft to form a magnetic layer on a portion of said passive shaft corresponding to said slit; and locating around said magnetic layer a detection coil for detecting a change in magnetic permeability due to a stress in said magnetic layer to be generated by said external force.
Claim 2
Independent Claim
125 words
A method of manufacturing a magnetostriction stress detector, comprising the steps of forming a passive shaft to which an external force is applied, from a magnetic material having a high magnetic permeability and a soft magnetism; forming a slit for allowing passage of a magnetic flux through a magnetic shielding plate formed of a nonmagnetic material having a high conductivity; winding said magnetic shielding plate around said passive shaft; fixing said magnetic shielding plate to said passive shaft to form a magnetic layer on a portion of said passive shaft corresponding to said slit; and locating around said magnetic layer a detection coil for detecting a change in magnetic permeability due to a stress in said magnetic layer to be generated by said external force.
Claim 3
Dependent Claim
25 words
The manufacturing method according to claim 1 further comprising the step of coating a solder plating on said magnetic shielding plate before said winding step.
Claim 4
Dependent Claim
37 words
The manufacturing method according to claim 1 further comprising the step of forming a recess on said passive shaft before said winding step, wherein said magnetic shielding plate is received in said recess in said winding step.
Claim 5
Dependent Claim
19 words
The manufacturing method according to claim 1, wherein said fixing step after said winding step comprises using fixing means.
Claim 6
Independent Claim
147 words
A method of manufacturing a magnetostriction stress detector, comprising the steps of forming a passive shaft to which an external force is applied, from an magnetic material having a high magnetic permeability and a soft magnetism; selectively forming a plurality of recesses on said passive shaft; immersing said passive shaft in a solder bath containing a nonmagnetic material having a high conductivity to fill said recesses with a solder of said nonmagnetic material and fix said solder in said recesses; removing part of said solder deposited on said passive shaft to form a plurality of magnetic shielding layers in said recesses and also form a magnetic layer between the adjacent ones of said magnetic shielding layers; and locating around said magnetic layer a detection coil for detecting a change in magnetic permeability due to a stress in said magnetic layer to be generated by said external force.
Claim 7
Independent Claim
147 words
A method of manufacturing a magnetostriction stress detector, comprising the steps of forming a passive shaft to which an external force is applied, from an magnetic material having a high magnetic permeability and a soft magnetism; selectively forming a plurality of recesses on said passive shaft; immersing said passive shaft in a solder bath containing a nonmagnetic material having a high conductivity to fill said recesses with a solder of said nonmagnetic material and fix said solder in said recesses; removing part of said solder deposited on said passive shaft to form a plurality of magnetic shielding layers in said recesses and also form a magnetic layer between the adjacent ones of said magnetic shielding layers; and locating around said magnetic layer a detection coil for detecting a change in magnetic permeability due to a stress in said magnetic layer to be generated by said external force.
Claim 8
Dependent Claim
20 words
The manufacturing method according to claim 5, wherein said recesses of said passive shaft are formed by a photoetching process.
Claim 9
Dependent Claim
33 words
The manufacturing method according to claim 5 further comprising the step of covering said passive shaft and said magnetic shielding layers with a plastic tube after the formation of said magnetic shielding layers.
References Cited (Backward Citations)
US4823620A
Cited
US5022275A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-15 | 1996-09-14 | 1997-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-15 | 2000-09-14 | 2001-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-15 | 2004-09-14 | 2005-03-16 | $7700.00 | Window Closed / Lapsed |