Title:
PHYSICAL QUANTITY DETECTOR AND PRINTING DEVICE
Document Type and Number:
Japanese Patent JP2021056081
Kind Code:
A
Abstract:
To provide a physical quantity detector and a printing device with which it is possible to more reliably and accurately detect the remaining quantity of a detection object.SOLUTION: Provided is a physical quantity detector comprising: a container for accommodating a detection object composed of a dielectric substance; a first electrode arranged on the outside of the container; a second electrode arranged facing the first electrode by being spaced apart therefrom; and a capacitance detection unit for detecting capacitance between the first and second electrodes. The capacitance detection unit includes a waveform generation source connected to the first electrode, and a voltage detection circuit connected to the second electrode. When it is assumed that |Zc| represents the absolute value of input impedance of the capacitance detection unit, |Z1| represents the absolute value of impedance when there exists the detection object between the first and second electrodes, and |Z2| represents the absolute value of impedance when the detection object does not exist between the first and second electrodes, the expression |Zc|/|Z1|+|Zc|>|Zc|/|Z2|+|Zc| is satisfied.SELECTED DRAWING: Figure 3
Inventors:
YONEMURA TAKAYUKI
Application Number:
JP2019178871A
Publication Date:
April 08, 2021
Filing Date:
September 30, 2019
Export Citation:
Assignee:
SEIKO EPSON CORP
International Classes:
G01F23/26; B41F33/00; B41F33/14; B41J2/175
Attorney, Agent or Firm:
Kazuaki Watanabe
Satoshi Nakai
Hiroki Matsuoka
Satoshi Nakai
Hiroki Matsuoka