Substrate for ink jet printing head, ink jet printing head, ink jet printing apparatus, and method of blowing fuse element of ink jet printing head - Patents

Substrate for ink jet printing head, ink jet printing head, ink jet printing apparatus, and method of blowing fuse element of ink jet printing head
Patent Agent: Fitzpatrick Cella Harper & Scinto - New York, NY, US
Patent Inventors: Takuya Hatsui, Teruo Ozaki, Ichiro Saito, Sakai Yokoyama, Kazuaki Shibata, Takahiro Matsui
Applicaton #: 20070008382
Class: 347061000 (USPTO)
01/11/07
The present invention reliably blows a fuse element to store with high reliability data that corresponds to whether or not the fuse element has been blown. For this purpose, a resistor element is provided in a circuit through which an electric current flows to blow the fuse element in the ink jet printing head. The resistor element adjusts the electric current so that, in the process of blowing the fuse element, the current continues to flow for a predetermined duration even after a maximum current has passed through the fuse element. The predetermined duration is longer than a period from a time point when the electric current rises to a time point it reaches the maximum current.
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a substrate for an ink jet printing head with fuse element that can be blown by passing an electric current therethrough, an ink jet printing head with the substrate, an ink jet printing apparatus using the ink jet printing head, and a method of blowing the fuse element of the ink jet printing head.
SUMMARY OF THE INVENTION
[0013] An object of this invention is to provide a substrate for an ink jet printing head, an ink jet printing head, an ink jet printing apparatus, and a method of blowing a fuse element of an ink jet printing head all of which can blow a fuse element reliably and store data with high reliability according to whether fuse element is blown or not.
[0014] In a first aspect of the present invention, there is provided a substrate for an ink jet printing head having ejection energy generation means for generating an ink ejection energy, and a fuse element capable of being blown by passing an electric current therethrough, the substrate comprising
[0015] current adjusting means provided in a circuit through which the electric current flows, wherein
[0016] in a process of blowing the fuse element, the current adjusting means adjusts the electric current so that the electric current continues to flow in the fuse element for a predetermined duration even after a maximum current has flowed through the fuse element, the predetermined duration is longer than a period from a time point when the electric current rises to a time point it reaches the maximum current.
[0017] In a second aspect of the present invention, there is provided an ink jet printing head including the substrate for the ink jet printing head of the first aspect of the present invention;
[0018] the ink jet printing head ejecting ink by driving the ejection energy generation means and being able to store data according to whether or not the fuse element have been blown.
[0019] In a third aspect of the present invention, there is provided an ink jet printing apparatus to print an image on a printing medium by using an ink jet printing head capable of ejecting ink, the ink jet printing apparatus comprising:
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