Dielectric heating device and liquid ejection system

Patent metadata

Field	Value
Publication number	US-12420566-B2
Application number	US-202318342762-A
Country	US
Kind code	B2
Filing date	Jun 28, 2023
Priority date	Jun 30, 2022
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

A dielectric heating device includes a first heater, configured to heat and dry the liquid, having first electrode and the second electrode facing a medium on which is deposited a liquid containing water, and a first coil electrically coupled in series with the first electrode, and a voltage application section that applies an AC voltage having a predetermined driving frequency to the first electrode and the second electrode. The first heater is configured such that a difference between a resonant frequency of the first heater and the driving frequency when the water content of the medium is in a first range is smaller than the difference between the resonant frequency of the first heater and the driving frequency when the water content is in a second range smaller than the first range, and a heat amount, when the water content is in the first range, is larger than a heat amount, when the water content is in the second range.

First claim

What is claimed is:

1. A dielectric heating device comprising:
a first heater that is configured to heat and dry a liquid and that includes
a first electrode and a second electrode that face a medium on which is deposited the liquid containing water and
a first coil electrically coupled in series with the first electrode

and
a voltage application section that applies an AC voltage having a predetermined driving frequency to the first electrode and to the second electrode, wherein
the first heater is configured such that a difference between the driving frequency and a resonant frequency of the first heater when the water content of the medium is in a first range is smaller than a difference between the driving frequency and the resonant frequency of the first heater when the water content is in a second range, which is smaller than the first range, and
a heat amount when the water content is in the first range is larger than a heat amount when the water content is in the second range.

2. The dielectric heating device, according to claim 1 , further comprising:
a second heater configured to heat and dry the liquid, including
a third electrode and a fourth electrode that face the medium and
a second coil electrically coupled in series with the third electrode,

wherein
the voltage application section applies an AC voltage of the driving frequency to the third electrode and to the fourth electrode and
the second heater is configured such that a difference between a resonant frequency of the second heater and the driving frequency when the water content of the medium is in a third range is smaller than a difference between the resonant frequency of the second heater and the driving frequency when the water content is in a fourth range, which is smaller than the third range and
a heat amount when the water content is in the third range is larger than a heat amount when the water content is in the fourth range.

3. The dielectric heating device, according to claim 2 , wherein
the first electrode, the second electrode, the third electrode, and the fourth electrode face the medium, which is transported in a first direction, in a second direction orthogonal to the first direction and
the first heater and the second heater are aligned along a third direction that is orthogonal to the first direction and that intersects the second direction.

4. The dielectric heating device according to claim 1 , wherein
the voltage application section includes a switching circuit that switches a DC voltage of a DC power supply to convert the DC voltage into an AC voltage having the driving frequency.

5. The dielectric heating device, according to claim 1 , wherein
the first heater is configured such that the driving frequency and the resonant frequency of the first heater match each other when the water content corresponds to a water content corresponding to when liquid is solidly coated on the medium.

6. A liquid ejection system comprising:
the dielectric heating device according to claim 1 and
a liquid ejection section configured to eject and apply the liquid to the medium, wherein
the first heater heats the medium to which the liquid has been applied by the liquid ejection section.

Assignees

• Seiko Epson Corp

Inventors

• Aizawa Tadashi

Classifications

• H05B6/54

  Electrodes · CPC title

• H05B6/52

  Feed lines · CPC title

• H05B6/48

  Circuits · CPC title

• B41J11/0024 Primary

  using conduction means, e.g. by using a heated platen · CPC title

• B41J2/21

  for multi-colour printing · CPC title