US3828294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration transducer having semiconductive piezoresistive element
Assignee: Nissan Motor Co Ltd
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Filing: 1972-04-10
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Granted: 1974-08-06
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Expires: 1992-04-10
Abstract
Abstract An acceleration transducer comprising a semiconductive plate having therein at least one piezoresistive element. The semiconductive plate is strained by a force exerted by a weight which is adapted to be movable according to an acceleration applied to the transducer. Due to the strain of the semiconductive plate, the element is varied in proportion to the amount of strain thereof. The variation of the resistivity of the element is therefore proportional to the magnitude of the acceleration applied to the transducer and utilized as an acceleration signal. The acceleration transducer is simple and compact in construction and has improved temperature and frequency characteristics.
Inventors
- 👤 A Hosaka
- 👤 K Baba
- 👤 K Wazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:03
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/12; G01P15/123
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
187 words
An acceleration transducer comprising: a deformable semiconductive member; at least one piezoresistive element having a resistance characteristic wherein the magnitude of the resistance varies in response to the magnitude of compressive and tensile forces applied to the element; means mounting said element on at least one deformable surface of the member to receive therefrom the stress forces developed in response to the deformation of the member, said stress forces comprising compressive and tensile forces on said element; and means responsive to variable acceleration forces for effecting variable deformation of said member to thereby result in variable stress forces applied to said element which vary the magnitude of the resistance thereof comprising a housing having an elongated bore therein and mountable in an acceleratable object, means mounting said member in said bore and disposing the deformable surfaces thereof perpendicular to the longitudinal axis of said bore, and a gravity member reciprocatably mounted in said bore and having one end portion thereof in contact with a deformable surface of said semiconductive member and movable in response to acceleration forces applied along said longitudinal axis to deform said semiconductive member.
Claim 2
Dependent Claim
187 words
An acceleration transducer comprising: a deformable semiconductive member; at least one piezoresistive element having a resistance characteristic wherein the magnitude of the resistance varies in response to the magnitude of compressive and tensile forces applied to the element; means mounting said element on at least one deformable surface of the member to receive therefrom the stress forces developed in response to the deformation of the member, said stress forces comprising compressive and tensile forces on said element; and means responsive to variable acceleration forces for effecting variable deformation of said member to thereby result in variable stress forces applied to said element which vary the magnitude of the resistance thereof comprising a housing having an elongated bore therein and mountable in an acceleratable object, means mounting said member in said bore and disposing the deformable surfaces thereof perpendicular to the longitudinal axis of said bore, and a gravity member reciprocatably mounted in said bore and having one end portion thereof in contact with a deformable surface of said semiconductive member and movable in response to acceleration forces applied along said longitudinal axis to deform said semiconductive member.
Claim 3
Dependent Claim
27 words
An acceleration transducer according to claim 1, wherein said one end portion of said grAvity member is fixedly attached to said deformable surface of said semiconductive member.
Claim 4
Dependent Claim
47 words
An acceleration transducer according to claim 1, wherein said means for effecting variable deformation of said semiconductive member further comprises a resilient member disposed between the other end portion of said gravity member and one end of said bore for damping the movement of said gravity member.
Claim 5
Dependent Claim
32 words
An acceleration transducer according to claim 1, further comprising circuit means responsive to the variations in the magnitude of the resistance of said element for developing a variable electrical signal proportional thereto.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |