US 12,285,938 B2
Dielectric heating device and printing system
Kazuyoshi Kegasawa, Hara (JP); and Tadashi Aizawa, Matsumoto (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 9, 2023, as Appl. No. 18/166,798.
Claims priority of application No. 2022-019172 (JP), filed on Feb. 10, 2022.
Prior Publication US 2023/0249478 A1, Aug. 10, 2023
Int. Cl. B41J 11/00 (2006.01); H02M 7/44 (2006.01); H05B 6/50 (2006.01); H05B 6/62 (2006.01)
CPC B41J 11/00242 (2021.01) [H02M 7/44 (2013.01); H05B 6/50 (2013.01); H05B 6/62 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A dielectric heating device comprising:
an electrode unit including a first electrode and a second electrode that face a to-be-heated object, and configured to heat the to-be-heated object;
a voltage application unit configured to apply an alternating-current voltage to the first electrode and the second electrode;
a current value detection unit configured to detect a current value of an alternating current that flows through the electrode unit;
a phase difference detection unit configured to detect a phase difference between the alternating-current voltage and the alternating current;
an impedance detection unit configured to detect an impedance of the electrode unit based on the current value and the phase difference; and
a control unit configured to control output of alternating-current power output to the electrode unit by controlling the voltage application unit based on the impedance, wherein
the electrode unit includes a coil electrically coupled in series to either one of the first electrode and the second electrode.