Expendable supplies container capable of measuring residual...

Details Expendable supplies container capable of measuring residual... Expendable supplies container capable of measuring residual...

2007-10-09

2007-10-09

Ramos-Feliciano, Eliseo (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C347S019000

Reexamination Certificate

active

10518528

ABSTRACT:
This invention is an expendable container capable of measuring a residual quantity of stored expendable. The expendable container comprising an expendable tank configured to store the expendable and has a piezoelectric element attached thereto; a detection signal generation circuit configured to charge and discharge the piezoelectric element, and generate a detection signal including cycle information, the cycle information representing a cycle of an output voltage wave of the piezoelectric element after the discharge; and a control module configured to control the charge and the discharge of the piezoelectric element by the detection signal generation circuit. The detection signal generation circuit comprises: a comparator configured to compare a voltage of the output voltage wave with a reference voltage for residual quantity detection, and generate a pulse according to a result of the comparison; and a signal generator configured to generate the detection signal in response to the generated pulse. The control module is capable of varying the reference voltage for residual quantity detection.

REFERENCES:
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patent: 2005/0237349 (2005-10-01), Nishihara
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patent: 2002-241450 (2002-08-01), None
International Search Report dated May 25, 2004, in PCT/JP2004/001155.

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