Ink-jet cartridge

Details Ink-jet cartridge Ink-jet cartridge

2002-12-30

2004-06-15

Vo, Anh T.N. (Department: 2861)

Incremental printing of symbolic information

Ink jet

Fluid or fluid source handling means

C347S086000

Reexamination Certificate

active

06749295

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the priority of Korean Patent Application No. 2002-31612, filed Jun. 5, 2002, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an ink-jet cartridge, and more particularly, to an ink-jet cartridge which includes a filter to control communication between a printhead and an ink reservoir filled with ink.
2. Description of the Related Art
FIG. 1
is a cross-sectional view of a conventional ink-jet cartridge
100
disclosed in U.S. Pat. No. 5,537,136. Referring to
FIG. 1
, the ink-jet cartridge
10
includes a cartridge body
11
including an ink chamber filled with a foam material
12
. A filter
18
is positioned on a standpipe
14
at a lower portion of the cartridge body
11
. The filter
18
isolates the foam material
12
containing ink from the standpipe
14
. Ink which flows through the filter
18
, is supplied to a printhead (not shown) through the standpipe
14
. The filter
18
prevents a passage of bubbles and ink particles from the ink chamber into the printhead.
However, since the filter
18
is a dome-shaped filter and is deformed by a compression force caused by the foam material
12
, a function of the filter
18
may be lowered. Also, since bubbles which flow from the printhead to an ink reservoir of the ink chamber, are collected on a center portion inside the dome-shaped filter
18
, the ink cannot be smoothly supplied from the ink reservoir to the printhead.
SUMMARY OF THE INVENTION
To solve the above and other problems, it is an object of the present invention to provide an ink-jet cartridge which guides bubbles to move from a printhead toward edges of a filter and smoothly supplies ink from an ink reservoir to the printhead.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Accordingly, to achieve an aspect of the invention, an ink-jet cartridge includes a cartridge body forming an ink reservoir, a standpipe coupled to one side of the ink reservoir, a printhead formed on a lower portion of an ink supply passage formed by the standpipe, through which ink from the ink reservoir is ejected onto a printing medium in a droplet shape, and a filter which covers a top portion of the standpipe. The filter is formed in a convex shape toward the printhead.
It is possible that a hook is formed on an edge of the filter to be disposed on (coupled to) the top portion of the standpipe.
It is also possible that the filter is substantially formed in a hemispherical shape or a cone shape.


REFERENCES:
patent: 5489932 (1996-02-01), Ceschin et al.
patent: 5502479 (1996-03-01), Ishinaga et al.
patent: 5537136 (1996-07-01), Brandon et al.
patent: 5815184 (1998-09-01), Ujita et al.
patent: 5898449 (1999-04-01), Narang et al.
patent: 5898450 (1999-04-01), Ahn

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