Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1990-10-25
1992-08-25
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
338308, B41J 205
Patent
active
051423081
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an ink jet head and an ink jet apparatus which include an electrothermal converting body which is superior in resisting property to a shock of a cavitation (hereinafter referred to as "cavitation resisting property"), resisting property to erosion by a cavitation (hereinafter referred to as "cavitation resisting property"), 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 and ink jet apparatus includes an electrothermal converting body having a heat generating resistor which generates, when energized, heat energy which is to be directly applied to ink on a heat acting face to cause the ink to be discharged. Then, such electrothermal converting body is low in power consumption and superior in responsibility to an input signal.
BACKGROUND OF THE INVENTION
An ink jet system (in particular, a bubble jet system) disclosed in U.S. Pat. No. 4,723,129, U.S. Pat. No. 4,740,796 and so forth 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 (recording liquid or the like) is discharged making use of heat energy, and accordingly, it has a heat acting portion which causes heat to act upon the ink. In particular, a heat generating resistor having a heat acting portion 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 has, from a point of 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 a thermal head in such points that it contacts directly with ink, that it is subjected to a 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 bubble jet technology as it is. In other words, the thermal head technology and ink jet technology cannot be argued on the same level.
By the way, as for a heat acting portion of an ink jet head, since it is subjected to such severe environment as described above, 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 provided as a protective film on a heat generating resistor and a cavitation resisting layer made of Ta or the like is provided further on the electric insulating layer in order to protect the heat acting portion from environment in which it is used. As composing materials 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 are described, for example, in U.S. Pat. No. 4,335,389 can be cited. It is to be noted that an abrasion resisting layer made of Ta.sub.2 O.sub.5 or the like popularly used for a thermal head is not always superior in cavitation resisting property.
Apart from this, it is desired for a heat acting portion of an ink jet head to be constituted such that heat generated from a heat generating resistor acts upon ink as efficiently and quickly as possible in order to save power consumption and improve the responsibility to an input signal. To this end, apart from the aforementioned form in which a protective l
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Hasegawa Kenji
Kimura Isao
Shiozaki Atsushi
Touma Kouichi
Canon Kabushiki Kaisha
Hartary Joseph W.
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