Inkjet printhead using non-aqueous ink
An inkjet printhead that uses a non-aqueous ink. The inkjet printhead includes a flow channel plate having an ink channel, and a nozzle plate which is combined with the flow channel plate and has a plurality of nozzles through which the non-aqueous ink is ejected, wherein a non-wetting coating film is formed on inner walls of the ink channel and the nozzles.
1. An inkjet printhead that uses a non-aqueous ink, comprising:
a flow channel plate having an ink channel; and
a nozzle plate combined with the flow channel plate and having a plurality of nozzles through which the non-aqueous ink is ejected,
wherein a non-wetting coating film is formed on inner walls of the ink channel and the nozzles.
2. The inkjet printhead of claim 1 , wherein the non-wetting coating film is further formed on a surface of the nozzle plate outside the nozzles.
3. The inkjet printhead of claim 1 , wherein the non-wetting coating film has a contact angle of approximately 40 to 90° with respect to the non-aqueous ink.
4. The inkjet printhead of claim 1 , wherein the non-wetting coating film is formed of perflurinated silane.
5. The inkjet printhead of claim 1 , wherein the ink channel is filled with the non-aqueous ink to be ejected, and further comprises:
a plurality of pressure chambers which are connected to the nozzles;
a manifold to supply the non-aqueous ink to the pressure chambers; and
a plurality of restrictors that connect the manifold to the pressure chambers.
6. The inkjet printhead of claim 1 , wherein the flow channel plate and the nozzle plate are formed of silicon.
7. The inkjet printhead of claim 6 , wherein the flow channel plate and the nozzle plate are formed as one unit.
8. The inkjet printhead of claim 6 , further comprising:
an ink-philic coating film formed of oxidized silicon between the flow channel plate and the non-wetting coating film and between the nozzle plate and the non-wetting coating film.
9. An inkjet printhead, comprising:
an ink flow path in which non-aqueous ink is contained and ejected out of;
a nozzle plate including at least one nozzle formed therethrough to provide a path in which the non-aqueous ink is ejected out of the ink flow path; and
a coating film providing a low surface energy formed on the inner walls of the flow path and the at least one nozzle.
10. The inkjet printhead of claim 9 , wherein the coating film is a non-wetting coating film.
11. The inkjet printhead of claim 9 , wherein the ink flow path comprises:
at least one pressure chamber;
a manifold to supply non-aqueous ink to the at least one pressure chamber; and
a restrictor corresponding to each of the at least one pressure chambers to connect the manifold to each of the at least one pressure chambers.
12. An inkjet printhead, comprising:
a flow channel plate having at least one pressure chamber formed with first inner walls; and
a nozzle plate disposed on the flow channel plate having at least one nozzle corresponding to the at least one pressure chamber formed with second inner walls and a first outer wall,
wherein the first inner walls, the second inner walls, and the first outer wall are coated with a low surface energy film to protect the pressure chamber and the at least one nozzle from non-aqueous ink residue.