US4352085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure transducer
Assignee: Robert Bosch GmbH
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Filing: 1981-03-27
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Granted: 1982-09-28
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Expires: 2001-03-27
Abstract
Abstract Two permanent magnets at an adjustably fixed distance from each other face each other with like poles and are mounted on the moveable portion of a pressure-sensitive membrane, with one magnet near the membrane, and the other one at some distance away, while a Hall-effect sensor of fixed position is located between the magnets. The null point of the output scale and the scope of the transducer characteristic can be set either by adjusting the position of the magnets or by adjusting the amount of their magnetization.
Inventors
- 👤 Werner Herden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:05
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/14; G01L9/0041; G01L9/0082
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A transducer for measuring pressure comprising a membrane mounted so as to be at least in part displaced by pressure to which it is exposed, a Hall-effect device for producing an electrical signal dependent upon the magnetic field in which it is located, a first permanent magnet mounted for producing a magnetic field such as to provide output of said Hall-effect device which is proportional to the pressure to which said membrane is exposed, a second permanent magnet on the opposite side of said Hall-effect device from which said first permanent magnet, said first and second magnets facing each other with like magnetic poles, and further comprising the improvement which consists in that: said first and second magnet are connected together and to a pressure-displaceable portion of said membrane by rigid structure so that the relative position of said magnets remains fixed and both may be displaced by said membrane relative to the Hall-effect device located between them.
Claim 2
Dependent Claim
158 words
A transducer for measuring pressure comprising a membrane mounted so as to be at least in part displaced by pressure to which it is exposed, a Hall-effect device for producing an electrical signal dependent upon the magnetic field in which it is located, a first permanent magnet mounted for producing a magnetic field such as to provide output of said Hall-effect device which is proportional to the pressure to which said membrane is exposed, a second permanent magnet on the opposite side of said Hall-effect device from which said first permanent magnet, said first and second magnets facing each other with like magnetic poles, and further comprising the improvement which consists in that: said first and second magnet are connected together and to a pressure-displaceable portion of said membrane by rigid structure so that the relative position of said magnets remains fixed and both may be displaced by said membrane relative to the Hall-effect device located between them.
Claim 3
Dependent Claim
38 words
A transducer as defined in claim 1, in which an adjustable bracket (30) is provided for rigidly connecting said first and second magnet (7, 9), said bracket being adjustable at least for adjusting the spacing between said brackets.
Claim 4
Dependent Claim
32 words
A transducer as defined in claim 1, in which said first permanent magnet (7) is mounted on said membrane (17) so as to be located between said membrane and said Hall-effect device.
Claim 5
Dependent Claim
32 words
A transducer as defined in claim 2, in which said first permanent magnet (7) is mounted on said membrane (17) so as to be located between said membrane and said Hall-effect device.
Claim 6
Dependent Claim
48 words
A transducer as defined in claim 1, in which the magnetization of said magnets (7, 9) is adjusted so to provide a specified zero point and slope in the electrical signal provided by said Hall-effect device in response to changes in pressure to which said membrane is exposed.
Claim 7
Dependent Claim
23 words
A transducer as defined in claim 1, 2, 3, 4 or 5, in which said magnets (7, 9) consist of a cobalt-samarium compound.
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) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |