US4876893A
Expired / Lapsed
US
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Strain gauges for the pressure sensor
Assignee: Aisin Corp
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Filing: 1987-12-24
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Granted: 1989-10-31
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Expires: 2007-12-24
Abstract
Abstract In order to improve the stabilization and the heat-resistance of a strain gauge, the strain gauge is made of an amorphous alloy including Ni (nickel), Cr (Chromium) and Si (silicon). The amorphous alloy including Ni, Cr and Si has a high crystallization point, its temperature co-efficient of resistance is almost zero obtained by annealing. The amorphous alloy is stabilized from low to high temperatures and thus can be used from low to high temperatures without compensation. The amorphous alloy is a non-magnetic substance and the strain gauge thus is not substantially affected by external electromagnetic noise.
Inventors
- 👤 Yukihiro Kato
- 👤 Masami Ishii
- 👤 Ryohei Yabuno
- 👤 Tetsuo Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:56
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0051; G01L1/00; G01L1/20; G01L1/22; G01L1/2287
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
52 words
A strain gauge comprising: a base plate of electrically insulated substance; and a thin alloy film of non-magnetic substance on said base plate wherein said thin alloy film is an amorphous (Ni a Cr 100-a ) 100-b Si b where the ranges of symbols a and b is established as 4≦a(wt%)≦60, 3≦b(wt%)≦8.
Claim 2
Dependent Claim
52 words
A strain gauge comprising: a base plate of electrically insulated substance; and a thin alloy film of non-magnetic substance on said base plate wherein said thin alloy film is an amorphous (Ni a Cr 100-a ) 100-b Si b where the ranges of symbols a and b is established as 4≦a(wt%)≦60, 3≦b(wt%)≦8.
Claim 3
Dependent Claim
19 words
A strain gauge according to claim 1 wherein a thickness of said film is established less than 0.5 micro-meter.
Claim 4
Dependent Claim
15 words
A strain gauge according to claim 1 wherein said base plate comprises a glass base.
Claim 5
Dependent Claim
16 words
A strain gauge according to claim 1 wherein said base plate comprises an insulated metal base.
Claim 6
Dependent Claim
70 words
A pressure sensor comprising: an electrically insulated diaphragm; a plurality of strain gauges, said strain gauges comprising a base plate of an electrically insulated substance; and a thin alloy film of a non-magnetic substance on said base plate, wherein said thin alloy film is an amorphous (Ni a Cr 100-a ) 100-b Si b where the ranges of symbols a and b is established as 40≦a(wt%)≦60, 3≦b(wt%)≦8, on said diaphragm.
Claim 7
Dependent Claim
70 words
A pressure sensor comprising: an electrically insulated diaphragm; a plurality of strain gauges, said strain gauges comprising a base plate of an electrically insulated substance; and a thin alloy film of a non-magnetic substance on said base plate, wherein said thin alloy film is an amorphous (Ni a Cr 100-a ) 100-b Si b where the ranges of symbols a and b is established as 40≦a(wt%)≦60, 3≦b(wt%)≦8, on said diaphragm.
Claim 8
Dependent Claim
15 words
A pressure sensor according to claim 5 wherein bridge circuit is provided on said diaphragm.
Claim 9
Dependent Claim
20 words
A pressure sensor according to claim 6 further comprising a amplifying circuit for amplifying an output from said bridge circuit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |