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AssigneeCanon Kabushiki Kaisha
InventorsTakaaki Yamaguchi, Yoshiyuki Imanaka, Takuya Hatsui, Muga Mochizuki, Souta Takeuchi, Kousuke Kubo
Estimating the term…
In a substrate for an ink jet head used for an ink jet head recording apparatus, electrostatic breakdown of a diode sensor functional as a substrate temperature sensing element is prevented. A protective element is electrically connected between a diode sensor and an input/output pad for the diode sensor.
A substrate for an ink jet head including a plurality of heaters for discharging ink, a driving circuit for driving the plurality of heaters, and a substrate temperature sensing element, said substrate temperature sensing element comprising a diode, for sensing a substrate temperature, all of which are formed on the same substrate, said substrate including an anode side input pad which is electrically connected to the diode and a cathode side input pad which is electrically connected to the diode,
An ink jet head attachable/detachable to an ink jet recording apparatus comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Structure of bubble jet print heads: structures including a sensor
Typewriters
Term ended 16 Nov 2023 (estimated)
1. Field of the Invention
The present invention relates to a substrate for an ink jet head having a protective element for electrically protecting internal elements. The substrate is used for an ink jet head operable to record by discharging ink droplets from discharge ports. The invention is further directed to an ink jet head having such a substrate for the ink jet head and an ink jet head recording apparatus having such an ink jet head.
2. Related Background Art
FIG. 1 is a plan view showing a configuration of a substrate for an ink jet head according to one embodiment of the present invention;
FIG. 2 is a diagram showing a circuit figure of a general diode sensor and a breakdown mode due to static discharge;
FIG. 3 is an equivalent circuit diagram showing a diode sensor in the substrate for an ink jet head according to one embodiment of the present invention;
In the following, a preferred embodiment of the present invention will be described with reference to drawings.
Note here that the term “on a substrate” described herein refers to not only an upper part of an element base, but also a surface thereof and an inner side thereof in the vicinity of the surface. Furthermore, the term “built-in” in the present invention does not indicate to simply arrange each of separate elements on the base but does indicate to form and fabricate each element integrally on the element base through a fabricating process for semiconductor circuits.
FIG. 1 is a plan view showing a substrate for an ink jet head according to one embodiment of the present invention.