Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
1999-03-29
2001-04-03
Barlow, John (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06209993
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink-jet printer. More particularly, the present invention relates to a method for fabricating an ink-jet printhead chip.
2. Description of the Related Art
In a conventional printhead chip, ink slots are formed on a silicon substrate. Since the silicon substrate is thick, the ink slots are long. As a result, a measurable resistance is generated when inks flow through the ink slots. The frequency response of the printhead chip is limited by the resistance. Furthermore, the ink slots may be clogged by overflow paste when the printhead chip adheres to an ink cartridge.
SUMMARY OF THE INVENTION
Accordingly, the present invention provides a method for fabricating an ink-jet printhead chip that reduces a resistance when inks flow through ink slots and prevents the ink slots from clogging.
To achieve these and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention provides a method for fabricating an ink-jet printhead chip. The method includes the following steps. A silicon substrate having a first surface and a second surface is provided. A plurality of grooves is formed in the first surface by an etching process. A plurality of ink slots is formed in each of the grooves. Overflow grooves are formed in the first surface beside the grooves. A plurality of firing chambers is formed on the second surface. Each of the firing chambers is respectively connected to each of the ink slots.
In the invention, the ink slots are formed in the groove, thus the length of the ink slot is short. The resistance generated when inks flow through the ink slot is reduced. During the adhesion process, the overflow groove stores redundant paste so that the ink slots are not clogged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
REFERENCES:
patent: 4922265 (1990-05-01), Pan
patent: 5387314 (1995-02-01), Baughman et al.
patent: 5572244 (1996-11-01), Drake et al.
patent: 5658471 (1997-08-01), Murthy et al.
patent: 5697144 (1997-12-01), Mitani et al.
patent: 5877791 (1999-03-01), Lee et al.
Hu Hung-Lieh
Lee Ming-Ling
Wang Chieh-Wen
Wu Yi-Yung
Barlow John
Huang Jiawei
Industrial Technology Research Institute
J. C. Patents
Stephens Juanita
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