Incremental printing of symbolic information – Ink jet – Ejector mechanism
Reexamination Certificate
2002-05-10
2003-07-08
Gordon, Raquel Yvette (Department: 2853)
Incremental printing of symbolic information
Ink jet
Ejector mechanism
Reexamination Certificate
active
06588878
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The present invention relates to a jet, and more particularly, to a jet that can eject droplets of different sizes.
2. Description of the Prior Art
Currently, jets ejecting droplets of different sizes are widely applied to improve combustion efficiency of fuel engines or increase a selectivity of ink jet printing. For example, ink jet printers can print documents with droplets of different sizes, and therefore improve a color variability and a speed of printing.
Please refer to
FIG. 1
of a schematic diagram of a jet
10
according to the prior art. The jet
10
is disclosed in U.S. Pat. No. 4,251,824 “Liquid jet recording method with variable thermal viscosity modulation”. The jet
10
uses a plurality of heat generating bodies
21
~
25
positioned on an axis of a chamber
12
to provide energy independently or in turn. Provision of energy causes a plurality of foams
31
~
35
to be generated in different positions, and therefore droplets of different sizes are ejected to print documents. However, since the plurality of heat generating bodies
21
~
25
must be disposed in one chamber
12
of the jet
10
, the jet
10
must comprise more chambers
12
and heat generating bodies so as to improve the print quality. This gives rise to an increased difficulty in a fabricating process of the jet
10
. In addition, the jet
10
has a disadvantage of easily jetting a satellite droplet, which leads to fuzziness in printed documents. The satellite droplets produced by the jet
10
follow the main droplets. When the jet
10
moves relative to the printed documents, the satellite droplets are printed onto places different from the main droplets. Thus, the print quality of the jet
10
is affected by the satellite droplets.
SUMMARY OF INVENTION
It is therefore a primary objective of the claimed invention to provide a jet which can eject droplets of different sizes to solve the above mentioned problem.
In a preferred embodiment, the claimed invention provides a jet, which uses a bubble as a virtual valve to increase flow resistance between a chamber and a manifold, or to interrupt flow communication between a chamber and a manifold. Then, another bubble is used to squeeze fluid inside the chamber and to eject the fluid out of the chamber. The jet comprises a substrate, an orifice layer, first nozzles and second nozzles. The orifice layer is positioned on the top layer of the substrate, and a plurality of first chambers and second chambers are formed between the orifice layer and the substrate.
It is an advantage of the claimed invention that the jet can eject droplets of different sizes by modifying sizes of the chambers and diameters of the orifices of the jet. Thus, the color variability and printing speed of the inkjet printer are improved.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment, which is illustrated in the various figures and drawings.
REFERENCES:
patent: 5557304 (1996-09-01), Stortz
patent: 6464342 (2002-10-01), Kubota et al.
Chen Wei-Lin
Chou Chung-Cheng
Hsu Tsung-Ping
Hu Hung-Sheng
Lee In-Yao
BenQ Corporation
Gordon Raquel Yvette
Hsu Winston
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