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US 4,907,020 AGranted
Driving circuit for an ink jet recording head having resistor elements respectively connected parallel to the electrothermal converting elements
AssigneeCanon Kabushiki Kaisha
InventorAtsushi Shiozaki
Life of this patent
Estimating the term…
Abstract
A driving circuit for an ink jet recording head that includes electrothermal converting elements for causing liquid emission by thermal energy. Electric energy is supplied to the electrothermal converting elements for actuation. Resistor elements are respectively and electrically connected parallel to the electrothermal converting elements for the purpose of reducing the influence of the capacitative component of the electrothermal converting elements to a negligible level, thereby suppressing electric current through the ink.
Claims25
A driving circuit for an ink jet recording head having a liquid path for retaining liquid to be discharged from the head, comprising:
- an electrothermal converting element corresponding to the liquid path for applying sufficient thermal energy to liquid in the liquid path to cause fluid discharge when electric current flows through said electrothermal converting element, said electrothermal converting element being subject to disruption of the current flow therethrough;
- wiring for supplying said electrothermal converting element with an electric current to cause liquid discharge;
- and
- a resistance element connected to said wiring in parallel with said electrothermal converting element for receiving the electric current supplied to said electrothermal converting element,
- wherein said resistance element applies insufficient thermal energy to liquid in the liquid path to cause liquid discharge when the electric current is supplied to said electrothermal converting element and said resistance element provides a path for the electric current to suppress current flow through liquid in the liquid path when current flow through said electrothermal converting element is disrupted.
2 more elements
An ink jet recording head comprising:
- a plurality of liquid paths for retaining liquid;
- a common liquid chamber for supplying liquid to said liquid paths;
- discharge ports communicating with said liquid paths for discharging liquid;
- electrothermal converting elements corresponding to respective said liquid paths for applying sufficient thermal energy to liquid in said liquid paths to cause liquid discharge from said discharge ports when electric current flows through said electrothermal converting elements, said electrothermal converting elements being subject to disruption of the current flow therethrough;
- wiring for supplying said electrothermal converting elements with an electric current to cause liquid discharge from said discharge ports;
- and
- resistance elements each connected to said wiring in parallel with a corresponding said electrothermal converting element for receiving the electric current supplied to said corresponding electrothermal converting element,
- wherein said resistance elements apply insufficient thermal energy to liquid in said liquid paths to cause liquid discharge when the electric current is supplied to said electrothermal converting elements and each said resistance element provides a path for the electric current to suppress current flow through liquid in said liquid paths when current flow through said corresponding electrothermal converting element is disrupted.
5 more elements
An ink jet recording head having a liquid path for retaining liquid to be discharged from the head, comprising:
- an electrothermal converting element having a predetermined resistance and corresponding to the liquid path for applying sufficient thermal energy to liquid in the liquid path to cause liquid discharge when electric current flows through said electrothermal converting element, said electrothermal converting element being subject to disruption of the current flow therethrough;
- wiring for supplying said electrothermal converting element with an electric current to cause liquid discharge;
- and
- a resistance element having an electrical resistance greater than that of said electrothermal converting element and being connected to said wiring in parallel with said electrothermal converting element for receiving the electric current supplied to said electrothermal converting element, wherein said resistance element applies insufficient thermal energy to liquid in the liquid path to cause liquid discharge when the electric current is supplied to said electrothermal converting element and said resistance element provides a path for the electric current to suppress current flow through liquid in the liquid path when current flow through said electrothermal converting element is disrupted.
1 more element
An ink jet recording head comprising:
- a plurality of liquid paths for retaining liquid;
- a common liquid chamber for supplying liquid to said liquid paths;
- discharge ports communicating with said liquid paths for discharging liquid;
- electrothermal converting elements having a predetermined resistance and corresponding to respective said liquid paths for applying sufficient thermal energy to liquid in said liquid paths to cause liquid discharge from said discharge ports when electric current flows through said electrothermal converting elements, said electrothermal converting elements being subject to disruption of the current flow therethrough;
- wiring for supplying said electrothermal converting elements with an electric current to cause liquid discharge from said discharge ports;
- and
- resistance elements having an electrical resistance greater than that of said electrothermal converting elements and each being connected to said wiring in parallel with a corresponding said electrothermal converting element for receiving the electric current supplied to said corresponding electrothermal converting element, wherein said resistance elements apply insufficient thermal energy to liquid in said liquid paths to cause liquid discharge when the electric current is supplied to said electrothermal converting elements and each said resistance element provides a path for the electric current to suppress current flow through liquid in said liquid paths when current flow through said corresponding electrothermal converting element is disrupted.
4 more elements
Dependencies are inferred from the claim text.