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EP0147238A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Weight sensor

Assignee: Ishida Scales Manufacturing Co Ltd
•
Filing: 1984-12-28
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Granted: —
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Expires: 2004-12-28
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Abstract

Abstract A load sensor includes a scale cell for producing an output signal corresponding to the weight of an article, a dummy cell provided near the scale cell for producing a noise signal output ascribable to floor vibration, and a correcting circuit for extracting a signal proportional to a DC component contained in the output signal of the scale cell and for correcting, on the basis of the extracted signal, the output signal of the dummy cell to the noise level of a floor vibration component of the scale cell. The corrected dummy cell noise signal is added in opposite-phase relation to the scale cell output signal, whereby the floor vibration noise contained in the scale cell output signal is cancelled out by the correcting noise signal of the dummy cell.

Inventors

  • 👤 Kazufumi Naito

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 22:12
CPC Classifications
G; G01; G01G; G01G23/00; G01G23/06; G01G23/10; G01G23/18; G01G23/36; G01G23/37; G01G23/3707; G01G23/3714

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 129 words
A weight sensor comprising: a scale cell for producing an output signal corresponding to the weight of an article to be weighed; a dummy cell provided in the vicinity of said scale cell for producing a noise signal output ascribable to floor vibration; a correcting circuit for extracting a signal proportional to a DC component contained in the output signal of said scale cell and for correcting, on the basis of the extracted signal, the output signal of said dummy cell to the noise level of a floor vibration component of said scale cell; and an adder for adding, in opposite-phase relation, the noise signal output of said dummy cell, which noise signal output has been corrected by said correcting circuit, and the output signal of said scale cell.
Claim 2
Dependent Claim 129 words
A weight sensor comprising: a scale cell for producing an output signal corresponding to the weight of an article to be weighed; a dummy cell provided in the vicinity of said scale cell for producing a noise signal output ascribable to floor vibration; a correcting circuit for extracting a signal proportional to a DC component contained in the output signal of said scale cell and for correcting, on the basis of the extracted signal, the output signal of said dummy cell to the noise level of a floor vibration component of said scale cell; and an adder for adding, in opposite-phase relation, the noise signal output of said dummy cell, which noise signal output has been corrected by said correcting circuit, and the output signal of said scale cell.
Claim 3
Dependent Claim 133 words
The weight sensor according to claim 1, wherein said correcting circuit comprises: first gain adjusting means for establishing agreement between a noise level of said dummy cell and a noise level contained in the output signal of said scale cell in the absence of the article to be weighed; adding means for adding, in opposite-phase relation, the corrected noise level of said dummy cell and the output signal of said scale cell to produce, as an output signal, a DC component contained in the output signal of said scale cell; multiplying means for multiplying the output signal of said adding means and the noise signal of said dummy cell; and second gain adjusting means for bringing an output level of said multiplying means into agreement with the noise level of said scale cell.
Claim 4
Dependent Claim 73 words
The weight sensor according to claim 1, wherein said correcting circuit comprises: a multiple comparator having as an input a signal proportional to a DC component contained in the output signal of said scale cell, and switching means for switching a noise signal level of said dummy cell by a gain adjusting resistor including a feedback resistance in dependence upon the weight of the article to be weighed from said multiple -stage comparator.

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