EP0251069A1
Expired / Lapsed
EP
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Accelerometer
Assignee: Hitachi Ltd
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Filing: 1987-06-19
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Granted: —
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Expires: 2007-06-19
Abstract
Abstract First and second Hall-effect proximity sensors (13, 14) are arranged in combination with a magnet (5) so that when the magnet (5) is moved under the influence of an accelerative force or the like the output of one sensor increases while the other decreases. The magnitude of the difference between the two outputs is indicative of the force while the effects of temperature on the individual signals mutually offset one and other.
Inventors
- 👤 Shinichi Io
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 04:16
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/105; Y; Y10; Y10S; Y10S73/00; Y10S73/01; Y10S73/03
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
106 words
In an accelerometer a first proximity sensor disposed in a casing; a second proximity sensor disposed in a casing close to said first proximity sensor; a magnet movably supported within the casing on a flexible member so as be movable from a neutral position in a first and second opposite directions, said first and second proximity sensors being arranged so that when said magnet is moved in said first direction the output of the first sensor increases and the second sensor decreases and when the magnet moves in the second direction the output of said second sensor increases and the output of the first one decreases.
Claim 2
Dependent Claim
106 words
In an accelerometer a first proximity sensor disposed in a casing; a second proximity sensor disposed in a casing close to said first proximity sensor; a magnet movably supported within the casing on a flexible member so as be movable from a neutral position in a first and second opposite directions, said first and second proximity sensors being arranged so that when said magnet is moved in said first direction the output of the first sensor increases and the second sensor decreases and when the magnet moves in the second direction the output of said second sensor increases and the output of the first one decreases.
Claim 3
Dependent Claim
50 words
An accelerometer as claimed in claim 1, further comprising a circuit which is responsive to the outputs of said first and second proximity sensors in a manner that difference between the two signals is determined and used as a measure of the accelerative force to which the magnet is subject.
Claim 4
Dependent Claim
60 words
An accelerometer as claimed in claim 1, wherein said casing includes a wall portion which hermetically divides the interior of the casing into first and second sections, wherein said magnet and the flexible member on which the magnet is supported being disposed in the first section and wherein the firt and second proximity sensors are disposed in said second section.
Claim 5
Dependent Claim
26 words
An accelerometer as claimed in claim 3, wherein said first chamber contains a damping fluid which exerts a damping effect on the movement of said magnet.
Claim 6
Dependent Claim
34 words
An accelerometer as claimed in claim 1, further comprising a mass, said mass being attached to said magnet in a manner which mass of the accelerometer which is movable when subject to accelerative forces.
Claim 7
Dependent Claim
57 words
An accelerometer as claimed in claim 4 wherein said first section includes a predetermined small quantity of air and which further comprises means defining a transparent window in the casing, said window opening into said first section and including a marker which can be used in combination with the small quantity of air as a level gauge.
Claim 8
Dependent Claim
33 words
An accelerometer as claimed in claim 1, wherein said flexible member is mounted on a member separate from said casing, said separate member being sealingly disposed in an aperture formed in said casing.
Claim 9
Dependent Claim
52 words
An accelerometer as claimed in claim 2, further comprising an illumination device disposed in said casing, said illumination device being operatively connected with said circuit in a manner to become illuminated when the signals from said first and second proximity sensors are balanced to the point that the difference therebetween is zero.
References Cited (Backward Citations)
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