Recorders – Markers and/or driving means therefor – With ink supply to marker
Patent
1991-10-22
1993-02-16
Hartary, Joseph W.
Recorders
Markers and/or driving means therefor
With ink supply to marker
B41J 205
Patent
active
051874997
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a liquid jet recording head for discharging recording liquid to record images of characters or the like. The present invention relates also to a substrate for liquid jet recording head for use in the preparation of the aforesaid head. The present invention further relates to a liquid jet recording apparatus provided with the aforesaid head.
BACKGROUND OF THE INVENTION
As for a liquid jet recording system (hereinafter occasionally referred to as "ink jet recording system"), there have been proposed a variety of systems. Among such proposals, as a typical one, the public attention has been focused on those liquid jet recording systems disclosed, for example, in U.S. Pat. No. 4,723,129 or 4,740,796 in recent years. These systems are of the type in short that recording liquid (hereinafter occasionally referred to as "ink") is discharged utilizing thermal energy and recording is performed with the liquid discharged. And there are advantages for these liquid jet recording systems that recording of a high quality image with a high density and a high resolution can be performed at a high speed, and it is relatively easy to attain miniaturization of a head or an apparatus.
A typical embodiment of the head in which such liquid jet recording system utilizing thermal energy is applied comprises a discharging outlet for discharging liquid, a liquid pathway in communication with said discharging outlet and having, as part of its constituent, a heat acting portion at which thermal energy, which is utilized for discharging the liquid from the discharging outlet, is effected to the liquid, and an electrothermal converting body which is disposed to correspond to the liquid pathway and which serves to generate the thermal energy to be utilized for discharging the liquid. And this electrothermal converting body has, in general, a pair of electrodes and a heat generating resistor layer disposed to connect said pair of electrodes and to form an exothermic region (heat generating portion). On this electrothermal converting body, an upper protective layer capable of protecting the electrothermal converting body from recording liquid is usually disposed. An example of the constitution of a substrate for liquid jet recording head to be used for the preparation of such liquid jet recording head is shown in FIG. 1(a) through FIG. 1(b).
FIG. 1(a) is a schematic plan view (including partial perspective views for explanatory purpose) of the principal portion of an example of the substrate for liquid jet recording head. FIG. 1(b) is a cross section view taken along the chain line X - Y in FIG. 1(a).
In FIG. 1(a) and FIG. 1(b), a substrate 101 for liquid jet recording head comprises a lower layer 106, a heat generating resistor layer 107, a pair of electrode layers 103 and 104, a first upper protective layer 108, a second upper protective layer 109 and a third upper protective layer 110 being laminated in this order on a support member 105. A portion 111 of the heat generating resistor layer 107 which is situated between the electrodes 103 and 104 forms a heat generating portion. Details of the respective constituents will be described later.
As for the material of which each of the upper protective layers in such substrate 101 for liquid jet recording head is formed, it is properly selected depending upon the characteristics required therefor such as heat resistance, resistance to liquid, thermal conductivity and insulating property. The principal role of the first upper protective layer 108 is to insulate between the electrode 103 and the electrode 104. The principal role of the second upper protective layer is to reinforce the resistance to liquid and the mechanical strength. The principal role of the third upper protective layer is to prevent liquid permeation and to improve the resistance to liquid. And in order to meet such requirements with respect to the characteristics, in many cases, the first upper protective layer is formed of an inorganic insulating material, the sec
REFERENCES:
patent: 4567493 (1986-01-01), Ikeda
patent: 4626875 (1986-12-01), Hara
patent: 5010355 (1991-04-01), Hawkins
Canon Kabushiki Kaisha
Hartary Joseph W.
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