Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1995-09-22
1999-09-14
Lund, Valerie
Incremental printing of symbolic information
Ink jet
Ejector mechanism
347 85, B41J 2175
Patent
active
059530235
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an ink jet head and an ink jet apparatus provided with said ink jet head. More particularly, the present invention relates to an ink jet head provided with a sealing member comprised of a specific silicone-modified epoxy resin at a joint portion for the constituent members of the ink supply passages and an ink jet apparatus provided with said ink jet head.
RELATED BACKGROUND ART
For the conventional ink jet head, there is a problem in that ink to be discharged to a printing medium has an occasion of leaking through a joint portion for the members constituting the ink supply passages from the ink container through the discharging outlets, wherein such leaked ink sometimes results in providing a stain onto a print product obtained. In addition, there is also a problem in that when an air bubble should present in the ink pathway, such air bubble is liable to cause a reduction in the energy dedicated for discharging ink, wherein the reduction will make it unable to conduct normal ink discharging. In view of this, in order to prevent the occurrence of such ink leakage and also in order to prevent such air bubble from entering into the ink pathway, there is a proposal in that a sealing material is disposed in the ink jet head or the joint portion of the constituent members for the ink supply passages of the ink jet head.
An example of a known ink jet head provided with such sealing member and an example of a known ink jet apparatus provided with such ink jet head are schematically shown in FIGS. 1 to 4.
FIG. 1 is a schematic slant view illustrating an example of the known ink jet head. FIG. 2 is a schematic cross-sectional view illustrating a cross section of a principal portion, namely a A-B cross-sectional portion, taken along the ink pathway of the ink jet head shown in FIG. 1 and which was viewed in a direction indicated by arrow marks in FIG. 1.
FIG. 3 is a schematic explanatory view of a discharging element portion of the ink jet head shown in FIG. 1. FIG. 4 is a schematic view illustrating an example of an ink jet apparatus provided with the ink jet head shown in FIG. 1.
In FIG. 1, reference numeral 1 indicates an ink jet head. To the ink jet head 1, there is connected an ink supply unit 2 for supplying ink. The ink supply unit 2 is connected to an ink tank 5 through ink supply tubes 3. The ink tank 5 comprises an ink container 5B containing black ink therein and a three-chambered ink container 5C containing yellow ink, magenta ink and cyan ink which are arranged respectively on an opposite side of an aluminum base plate 4 for the ink jet head. Each of these ink containers is provided with an insertion hole into which the ink supply tube 3 can be inserted so that the ink containers can be detachably connected to the ink supply unit 2.
The ink jet head 1 has such constitutions as shown in FIG. 2 and FIG. 3, wherein the ink jet head comprises an electrothermal converting body comprising a heat generating element 103 and wirings 102 for said heat generating element formed by means of the conventional thin film-forming technique on a silicon wafer base member 101. On the silicon wafer base member having said electrothermal converting body formed thereon, there is disposed an ink pathway wall 104 having ink pathway-forming walls 104a and a common ink chamber-forming wall 104b formed by a resin such as a photosensitive resin. Reference numeral 105 indicates a top plate made of glass which is joined so as to cover recesses formed by the ink pathway wall 104 thereby establishing ink pathways and a common ink chamber. The top plate 105 is provided with an opening as a common ink supply port 107. The common ink supply port 107 is covered by a filter 106 for ink. The top plate 105 is provided with a sealing member 110 formed by means of a dispenser or by the screen printing process. The ink supply unit 2 is connected to the common ink supply port through the sealing member 110.
FIG. 4 is a schematic explanatory view of an example of an ink jet apparatus (IJ
REFERENCES:
patent: Re32572 (1988-01-01), Hawkins et al.
Aono Kenji
Maeoka Kunihiko
Shimomura Akihiko
Toganoh Shigeo
Canon Kabushiki Kaisha
Lund Valerie
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