Printhead and printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKengo Umeda, Ryo Kasai
Life of this patent
Estimating the term…
Abstract
A printhead includes a printing element; a first power supply wiring configured to be electrically connected to one terminal of the printing element and supply power to the printing element; a transistor configured to be electrically connected to another terminal of the printing element and drive the printing element; a first ground wiring configured to be electrically connected to a source of the transistor; a second ground wiring configured to be electrically connected to a back gate of the transistor; and a first capacitive element configured to be electrically connected, at one terminal thereof, to the first ground wiring and electrically connected at another terminal thereof, to the second ground wiring.
Claims17
A printhead, comprising:
- a printing element;
- a first power supply wiring configured to be electrically connected to one terminal of the printing element and supply power to the printing element;
- a transistor configured to be electrically connected to another terminal of the printing element and drive the printing element;
- a control circuit configured to control the transistor;
- a first ground wiring configured to be electrically connected to a source of the transistor;
- a second ground wiring configured to be electrically connected to a ground terminal of the control circuit;
- a first capacitive element configured to be electrically connected, at one terminal thereof, to the first ground wiring and electrically connected, at another terminal thereof, to the second ground wiring;
- an element substrate;
- and
- a wiring substrate,
- wherein the printing element and the transistor are disposed on the element substrate, and the first capacitive element is disposed on the wiring substrate.
A printing apparatus, comprising:
- a printhead and a control substrate,
- the printhead comprising:
- a printing element;
- a power supply wiring configured to be electrically connected to one terminal of the printing element and supply power to the printing element;
- a transistor configured to be electrically connected to another terminal of the printing element and drive the printing element;
- a control circuit configured to control the transistor;
- a first ground wiring configured to be electrically connected to a source of the transistor;
- a second ground wiring configured to be electrically connected to a ground terminal of the control circuit;
- a first capacitive element configured to be electrically connected, at one terminal thereof, to the first ground wiring and electrically connected, at another terminal thereof, to the second ground wiring;
- an element substrate;
- and
- a wiring substrate,
- wherein the printing element and the transistor are disposed on the element substrate, and the first capacitive element is disposed on the wiring substrate, and
- the control substrate comprising:
- a power circuit configured to be connected to the printing element via the power supply wiring and generate power to be supplied to the printing element, wherein
- the first ground wiring and the second ground wiring are electrically connected on the control substrate.
Dependencies are inferred from the claim text.