Liquid tank and fuel cell
First Claim
1. A liquid tank comprising:
- a liquid container section storing liquid; and
a detector detecting volume of the liquid stored in the liquid container section, the detector including;
a first board having, on a front face thereof, a pair of detection electrodes for detecting a stray capacitance, the pair of detection electrodes directly or indirectly contacting with the liquid inside the liquid container section;
a second board having a shielding electrode and arranged on a back face side of the first board; and
a liquid pump drawing up the liquid stored inside the liquid container section,wherein the detector includes, on a back side of the first and second boards, a printed board with a volume measurement circuit mounted thereon, the printed board being configured to measure the stray capacitance between the pair of detection electrodes, andwherein the volume measurement circuit includesa memory section storing an operation history of the liquid pump, anda calculation section calculating, based on the operation history stored in the memory section, an amount of the liquid that has been drawn up, and calculate the volume of the liquid based on both the amount that has been drawn up and the stray capacitance.
3 Assignments
0 Petitions
Accused Products
Abstract
Provided are a liquid tank capable of reducing an influence of disturbance on measurement results and measuring accurate volume, and a fuel cell using the same. One face of a liquid container section is structured by a detector in which a first board to a fourth board each configured of a printed board are stacked in order. A pair of detection electrodes 12A and 12B are provided on a front face of the first board, and this pair of detection electrodes 12A and 12B are allowed to contact directly or indirectly to a liquid fuel inside the liquid container section to detect a stray capacitance. A back face side of the first board is disposed with the second board having a shielding electrode 22. Even when a hand or the like is brought close to the detector, the detection electrodes 12A and 12B are prevented from sensing the stray capacitance generated as a result.
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Citations
10 Claims
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1. A liquid tank comprising:
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a liquid container section storing liquid; and a detector detecting volume of the liquid stored in the liquid container section, the detector including; a first board having, on a front face thereof, a pair of detection electrodes for detecting a stray capacitance, the pair of detection electrodes directly or indirectly contacting with the liquid inside the liquid container section; a second board having a shielding electrode and arranged on a back face side of the first board; and a liquid pump drawing up the liquid stored inside the liquid container section, wherein the detector includes, on a back side of the first and second boards, a printed board with a volume measurement circuit mounted thereon, the printed board being configured to measure the stray capacitance between the pair of detection electrodes, and wherein the volume measurement circuit includes a memory section storing an operation history of the liquid pump, and a calculation section calculating, based on the operation history stored in the memory section, an amount of the liquid that has been drawn up, and calculate the volume of the liquid based on both the amount that has been drawn up and the stray capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fuel cell with a fuel cell main body and a fuel cartridge which includes a liquid tank, the liquid tank comprising:
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a liquid container section storing liquid; and a detector detecting volume of the liquid stored in the liquid container section, the detector including; a first board having, on a front face thereof, a pair of detection electrodes for detecting a stray capacitance, the pair of detection electrodes directly or indirectly contacting with the liquid inside the liquid container section; a second board having a shielding electrode and arranged on a back face side of the first board; and a liquid pump drawing up the liquid stored inside the liquid container section, wherein the detector includes, on a back side of the first and second boards, a printed board with a volume measurement circuit mounted thereon, the printed board being configured to measure the stray capacitance between the pair of detection electrodes, and wherein the volume measurement circuit includes a memory section storing an operation history of the liquid pump, and a calculation section calculating, based on the operation history stored in the memory section, an amount of the liquid that has been drawn up, and calculate the volume of the liquid based on both the amount that has been drawn up and the stray capacitance.
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Specification