Stock material or miscellaneous articles – Composite – Of polyimide
Reexamination Certificate
1999-04-01
2001-10-02
Nakarani, D. S. (Department: 1773)
Stock material or miscellaneous articles
Composite
Of polyimide
C427S490000, C427S534000, C427S536000, C427S569000
Reexamination Certificate
active
06296946
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a plastic base material having excellent water repellency and ink repellency, and the durability of such water repellency and ink repellency; a method for manufacturing such a plastic base material; a head for ink-jet printers; and a method for manufacturing such a head.
BACKGROUND ART
In recent year, a demand for printers has been increased accompanying the diffusion of personal computers into homes. In particular, ink-jet printers have significantly been diffused because of their small noise during operation, the capability of high-speed printing, and the ease of application for color printing.
Heretofore, various systems of ink-jet printers have been proposed.
FIG. 13
is a sectional view showing the construction of a conventional head for a pressure control type ink-jet printer. As
FIG. 13
shows, such a head has the construction in which ink
56
stored in an ink chamber is ejected for printing through a nozzle opening
53
of a nozzle-forming film
51
dropwise using an ultrasonic oscillator
58
according to pulse signals.
Next,
FIG. 14
is a sectional view showing the construction of a conventional head for a heater heating type ink-jet printer. As
FIG. 14
shows, such a head has the construction in which ink
56
is heated according to pulse signals by a heater
55
to which electrodes
54
are connected to produce air bubbles
57
and eject the ink
56
through a nozzle opening
53
of a nozzle-forming film
51
.
In both systems, a film having a thickness between 0.1 and 0.5 mm consisting of polyimide which excels in heat resistance is used as the nozzle-forming film
51
. Since the nozzle opening
53
of the nozzle-forming film
51
is often formed by a laser heating process, and heat resistance is required for the film, polyimide is usually used as the material for the nozzle-forming film
51
.
Next,
FIG. 15
is a sectional view showing ink ejection in a conventional ink-jet printer. When ink
56
is ejected through a nozzle opening
53
, it is essential for high-quality printing that the ink
56
is ejected straight as FIG.
15
(
a
) shows.
However, conventional ink-jet printers have a drawback in that if the ink
56
conforms to the nozzle-forming film
51
and wets the film
51
, the ink
56
is attracted toward the wet surface resulting in that the ink
56
cannot be ejected straight as FIG.
15
(
b
) shows, and the track of ink ejection becomes unstable. There was a problem that, in particular, if the ink is ejected for a long period of time, the nozzle forming film
51
tended to be wet by the ink and thus the quality of printing was degraded.
DISCLOSURE OF THE INVENTION
The present invention has been performed to solve problems in conventional systems as described above. It is a main object of the present invention to solve the unstableness of ink ejecting track caused by the conformity of ink to the nozzle-forming film formed by a plastic material represented for example by polyimide for a long period of time.
The present invention of claim
1
is a plastic base material having a layer containing fluorine and carbon on the surface thereof, the ratio of the number of said fluorine atoms to the number of said carbon atoms, F/C, being 0.85 or more and 1.30 or less.
The present invention of claim
6
is a method of manufacturing a plastic base material comprising a step of reforming the upper layer of a plastic base material into a layer containing fluorine and carbon by irradiating fluorine-containing plasma onto said plastic base material.
The present invention of claim
9
is a head for an ink-jet printer comprising a nozzle constituting member having a plurality of nozzle openings formed thereon, for ejecting ink from said nozzle openings, wherein a fluorine-containing layer is formed on the surface of said nozzle constituting member.
The present invention of claim
14
is a method of manufacturing a head for an ink-jet printer comprising a nozzle-forming member having a plurality of nozzle openings formed thereon, for ejecting ink from said nozzle openings, comprising a step of reforming the upper layer of said nozzle-forming film into a layer containing fluorine by irradiating fluorine-containing plasma onto the surface of said nozzle constituting member.
REFERENCES:
patent: 5795655 (1998-08-01), Endo
patent: 5599932A (1980-07-01), None
patent: 58175666A (1983-10-01), None
patent: 6335632A (1988-02-01), None
patent: 0320465B (1991-03-01), None
patent: 0568874A (1993-03-01), None
patent: 050116325A (1993-05-01), None
patent: 6313615B (1994-02-01), None
patent: 63-114978A (1998-05-01), None
JP Laid-open No. 6-65408 with English abstract Mar. 8, 1994.
Inoue Isamu
Kotera Koichi
Tanaka Hiroyoshi
Watanabe Osamu
Matsushita Electric - Industrial Co., Ltd.
Nakarani D. S.
Smith , Gambrell & Russell, LLP
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