Back to results
US 12,654,465 B2Granted
Thermal print head and thermal printer
AssigneeRohm Co., Ltd.
InventorKaoru Muraki
Life of this patent
Estimating the term…
Abstract
A thermal printhead includes a plurality of heating resistor portions, a first capacitor, a switch section, and a first resistor. The heating resistor portions are electrically connected in parallel to each other. The first capacitor is electrically connected in parallel to the heating resistor portions. The switch section is electrically connected in series to the first capacitor. The first resistor is electrically connected in parallel to the first capacitor.
Claims17
A thermal printhead comprising:
- a plurality of heating resistor portions electrically connected in parallel to each other;
- a first capacitor electrically connected in parallel to the plurality of heating resistor portions;
- a switch section electrically connected in series to the first capacitor and disposed between the first capacitor and a ground potential;
- and
- a first resistor electrically connected in parallel to the first capacitor with no switch intervening between the first resistor and the first capacitor.
2 more elements
A thermal printhead comprising:
- a plurality of heating resistor portions electrically connected in parallel to each other;
- a first capacitor electrically connected in parallel to the plurality of heating resistor portions;
- a switch section electrically connected in series to the first capacitor;
- a first resistor electrically connected in parallel to the first capacitor and electrically connected in series to the switch section;
- and
- a connector including a first connector terminal,
- wherein the first connector terminal is electrically connected to each of the plurality of heating resistor portions and the first capacitor,
- the switch section is driven based on a potential at the first connector terminal,
- the switch section includes a first switch terminal and a second switch terminal,
- when the first connector terminal is at a first potential, a current that flows between the first switch terminal and the second switch terminal has a first current value,
- when the first connector terminal is at a second potential, a current that flows between the first switch terminal and the second switch terminal has a second current value,
- the second potential is smaller than the first potential and greater than 0, and the second current value is smaller than the first current value,
- the switch section includes a first transistor,
- the first transistor includes the first switch terminal, the second switch terminal, and a first control terminal that controls conduction of the current that flows between the first switch terminal and the second switch terminal, and
- the switch section includes a third transistor electrically connected in series to the first capacitor and the first resistor and connected in parallel to the first transistor.
12 more elements
A thermal printhead comprising:
- a plurality of heating resistor portions electrically connected in parallel to each other;
- a first capacitor electrically connected in parallel to the plurality of heating resistor portions;
- a switch section electrically connected in series to the first capacitor;
- and
- a first resistor electrically connected in parallel to the first capacitor,
- wherein the switch section includes a fourth transistor electrically connected in series to the first resistor, and
- the first capacitor is electrically connected in parallel to the first resistor and the fourth transistor.
4 more elements
Dependencies are inferred from the claim text.