Printing head and ink jet printing apparatus - Patents ...

Printing head and ink jet printing apparatus

Printing head and ink jet printing apparatus

Patent Agent: Fitzpatrick Cella Harper & Scinto - New York, NY, US
Patent Inventor: Toru Kanda
Applicaton #: 20070008378
Class: 347054000 (USPTO)
01/11/07

In spite of relative deformation between a printing element substrate and a supporting member due to a change in temperature of a printing head, the printing quality is stabilized, and the printing head is not damaged. In detail, as the temperature of the supporting member and the printing element substrate, which are adhered to and fixed to each other in an expanded state falls to the room temperature, the supporting member further greatly contracts than the printing element substrate, and a stress relation is caused to be present between the respective members. At this time, ribs are deformed in the direction of widening the ribs, which is the direction toward the outside of the printing element substrate, whereby the above-described difference in deformation can be absorbed, and influence onto the printing element substrate can be relieved.
SUMMARY OF THE INVENTION
[0018] An object of the invention is to provide a printing head which is capable of stabilizing the printing quality and is not subjected to breakage, in spite of relative deformation caused between a printing element substrate and a supporting member due to a change in temperature of the printing head, and an ink jet printing apparatus using the same printing head.
[0019] In the first aspect of the present invention, there is provided a printing head formed by adhering a printing element substrate provided with a energy generating element for generating energy used for ejecting ink to a supporting member, where thermal expansion ratios of the printing element substrate and the supporting member are different from each other, the printing head comprising:
[0020] a rib for dividing a hollow portion formed inside the supporting member from the outside of the supporting member, the rib being provided at a part of a portion where the supporting member is adhered to the printing element substrate,
[0021] wherein the printing element substrate is adhered to the supporting member in a state where an upper surface of the rib inclines in a direction toward an outside of the printing element substrate.
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