Incremental printing of symbolic information – Ink jet – Ejector mechanism
Patent
1993-04-29
1995-12-19
Hartary, Joseph W.
Incremental printing of symbolic information
Ink jet
Ejector mechanism
338308, 347204, 252514, B41J 205
Patent
active
054772524
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an ink jet head, a substrate for ink jet head capable of constituting said ink jet head and an ink jet apparatus which include an electrothermal converting body which excels in resistance to shock by cavitation, resistance to erosion by cavitation, chemical stability, electrochemical stability, oxidation resisting property, dissolution resisting property, heat resisting property, thermal shock resisting property, mechanical durability and so forth.
A representative one of such ink jet heads includes an electrothermal converting body having a heat generating resistor capable of generating, when energized, heat energy which is to be directly applied to ink on a heat acting face to cause the ink to be discharged. Such electrothermal converting body is low in power consumption and excels in responsibility to a signal inputted.
BACKGROUND OF THE INVENTION
An ink jet system utilizing heat energy disclosed in U.S. Pat. Nos. 4,723,129, 4,740,796, etc. can provide high speed, high density and high definition recording of a high quality and is suitable for color recording and also for compact designing. Accordingly, progressively increasing attention has been paid to such ink jet system in recent years. In a representative one of apparatus which employ such system, ink as the recording liquid is discharged utilizing heat energy, and accordingly, it has a heat acting portion which causes heat to act upon the ink. In particular, a heat generating resistor is provided for an ink pathway, and making use of heat energy generated from the heat generating resistor, ink is heated suddenly to produce an air bubble by which the ink is discharged.
The heat acting portion, in view of causing heat to act upon an object, a portion apparently similar in construction to a conventional so-called thermal head. However, the heat acting portion is quite different in fundamental technology from the thermal head in such portions that it contacts directly with ink, that it is subjected to mechanical shock which is caused by cavitations produced by repetitions of production and extinction of bubbles of ink, or in some cases, further to erosion, that it is subjected to a rise and a drop of temperature over almost 1,000.degree. C. for a very short period of time of the order of 10.sup.-1 to 10 microseconds, and so forth. Accordingly, the thermal head technology cannot naturally be applied to the ink jet technology as it is. In other words, the thermal head technology and the ink jet technology cannot be discussed on the same level.
Incidentally, as for the heat acting portion of an ink jet head, since it is subjected to such severe environment as above described, it is a common practice to employ such a structure that an electric insulating layer made of, for example, SiO.sub.2, SiC, Si.sub.3 N.sub.4 or the like is disposed as a protective film on a heat generating resistor and a cavitation resisting layer made of Ta or the like is disposed thereon in order to protect the heat acting portion from environment in which it is used. As the constituent material of such protective layer for use with an ink jet head, such materials which are tough against a shock and erosion by a cavitation as described, for example, in U.S. Pat. No. 4,335,389 can be mentioned.
Apart from this, it is desired for the heat acting portion of an ink jet head to be designed such that heat generated from the heat generating resistor acts upon ink as efficiently and quickly as possible in order to save power consumption and improve the responsibility to a signal inputted. For this, other than the above-mentioned configuration in which the protective layer is provided, a configuration in which a heat generating resistor is disposed so as to directly contact with ink has been proposed by Japanese Patent Laid-open No. 126462/1980.
The ink jet head of this configuration is superior to the configuration in which the protective layer is provided with regard to thermal efficiency. However in this case, the heat generati
REFERENCES:
patent: 3763026 (1973-10-01), Cordes
patent: 3876560 (1975-04-01), Kuo
patent: 5142308 (1992-08-01), Hasegawa
patent: 5148191 (1992-09-01), Hasegawa
Hasegawa Kenji
Kimura Isao
Shiozaki Atsushi
Touma Koichi
Canon Kabushiki Kaisha
Hartary Joseph W.
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