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US 7,597,424 B2Granted
Printhead substrate, printhead, head cartridge, and printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorNobuyuki Hirayama
Life of this patent
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AssigneeCanon Kabushiki Kaisha
InventorNobuyuki Hirayama
Estimating the term…
An object of this invention is to implement higher-quality printing at a higher speed by changing an electric current value to a printing element and adjusting energy applied to the printing element in an inkjet printhead. To achieve this object, a current regulating circuit is arranged on the head substrate of an inkjet printhead of a constant electric current driving type which supplies a constant electric current to a heater. The electric current value is changed in accordance with a signal (digital signal etc.) supplied from the outside of the printhead. Energy corresponding to the electric current value is applied to the printing element from a constant electric current source corresponding to each group.
A printhead substrate comprising:
A printhead substrate comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
By pressure, e.g. electromechanical transducers: produced by the application of heat
Control methods or devices therefor, e.g. driver circuits, control circuits: specific driving circuit
Control methods or devices therefor, e.g. driver circuits, control circuits: block driving
Control methods or devices therefor, e.g. driver circuits, control circuits: details of power line section of control circuit
Term ended 23 Jul 2025 (estimated)
This invention relates to a printhead substrate, printhead, head cartridge, and printing apparatus and, more particularly, to a printhead substrate, containing a circuit for driving a printing element by sending a predetermined electric current, which is used to print in accordance with an inkjet method, printhead, head cartridge, and printing apparatus.
An inkjet printhead (to be referred to as a printhead hereinafter), which generates thermal energy by sending an electric current to a heater arranged in the nozzle so as to discharges ink, has conventionally been known.
This printhead is a printhead which employs a method of bubbling ink near the heater by using the generated thermal energy, and discharging ink from the nozzle to print.
The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
FIG. 1 is an outer perspective view showing a schematic arrangement around the carriage of an inkjet printing apparatus as a typical embodiment of the present invention;
FIG. 2 is an outer perspective view showing the detailed arrangement of an inkjet cartridge IJC;
Preferred embodiments of the present invention will now be described in accordance with the accompanying drawings.
In this specification, the terms “print” and “printing” not only include the formation of significant information such as characters and graphics, but also broadly includes the formation of images, figures, patterns, and the like on a print medium, or the processing of the medium, regardless of whether they are significant or insignificant and whether they are so visualized as to be visually perceivable by humans.
Also, the term “print medium” not only includes a paper sheet used in common printing apparatuses, but also broadly includes materials, such as cloth, a plastic film, a metal plate, glass, ceramics, wood, and leather, capable of accepting ink.