Abstract:
By the present invention, there is provided an ink-jet recording head comprising at least one recording device substrate for discharging a recording liquid by pressure of bubble formation caused by thermal energy, a flexible film wiring substrate for fitting the recording device substrate thereto, an electrode pad for receiving control signals from outside for controlling thermal energy generation in the recording device substrate, and a wiring substrate connected electrically to the recording device substrate with interposition of the flexible film wiring substrate, wherein an input terminal of the flexible film wiring substrate and an output terminal of the wiring substrate are electrically connected to each other and fixed by a thermosetting adhesive by hot-pressing, and the connected electrode portion is coated with the thermosetting adhesive.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a recording head of an ink-jet recording apparatus for OA machines or the like. Particularly, the present invention relates to an ink-jet recording head comprising a recording device substrate for discharging a recording liquid fitted to a flexible film wiring substrate. The present invention relates also to an ink-jet recording apparatus employing the ink-jet recording head. 
     2. Related Background Art 
     The ink-jet recording apparatus, which conducts recording by a non-impact recording system, has advantages of high speed recording, suitability for various recording mediums, and less recording noise generation. Therefore, the ink-jet recording is employed widely in recording mechanisms of various machines such as printers, word processors, and copying machines. 
     The ink-jet recording conducts recording by discharging fine liquid droplets through a discharge opening onto a recording medium like a paper sheet, typically employing an electrothermal converting element. The ink-jet recording apparatus is constituted generally of an ink-jet recording head having a nozzle for forming liquid droplets and an ink-supplying system for supplying the ink to the head. In the ink-jet recording head employing an electrothermal converting element, the electrothermal converting element is provided in a pressurizing chamber. An electric pulse as the recording signal is applied to the electrothermal converting element to give thermal energy to the recording liquid. The phase change of the recording liquid due to thermal energy causes bubbling (or boiling) of the recording liquid, and the pressure of the bubbles forces the recording liquid to eject. 
     The ink-jet recording heads employing the electrothermal converting system are classified into two types: an edge shooter type which discharges the recording liquid in the direction parallel to the substrate having electrothermal converting elements arranged thereon, and a side shooter type which discharges the recording liquid in the direction perpendicular to the substrate. The constitution of the ink-jet recording head is described specifically by reference to the side shooter type recording head. 
     FIG. 10 is a perspective view of a side shooter type recording head. 
     Plural discharge openings  202  are formed for discharging ink at the central portion on the front side of a recording device substrate  201 . On the reverse side of the substrate, an ink-supplying opening  203  (broken line in the drawing) is formed in a length nearly equal to the length of the row of the discharge openings. Although several discharge openings are shown in FIG. 10, several tens or several hundreds of discharge openings are provided in a practical recording device substrate. 
     For ink discharge, electrodes on the recording device substrate  201  are electrically connected to electrode terminals of a flexible film wiring substrate  204 . The input terminals of the flexible film wiring substrate  204  are electrically connected to output terminals of a wiring substrate  206  having external input pads  205  for supplying electric signals of recording information and the like to an ink-jet recording head from an ink-jet recording apparatus body. The numeral  212  indicates an ink supplying-holding member. 
     FIG. 11 shows specifically a structure of the recording device substrate and the flexible film wiring substrate. FIG.  12 A and FIG. 12B show the state of the recording device substrate fitted to the flexible film wiring substrate: FIG. 12A is a perspective view showing the state, and FIG. 12B is a sectional view taken along the plane  12 B in FIG.  12 A. 
     In FIG. 11, electrodes  210  are formed on a recording device substrate  201  for connection with output terminals of a flexible film wiring substrate  204 . The electrodes  210  are usually formed in rows on the end portion of the surface of the recording device substrate  201 . The electrode formation can be conducted by a conventional technique such as plating by patterning, and ball-electrode formation by wire bonding (stud bump). 
     The flexible film wiring substrate  204  has an aperture which uncovers the orifice face  207  having discharge orifices  202  when the recording device substrate  201  is fitted thereto. In this aperture, electrode terminals  208  are provided for connection with the electrodes  210  on the recording device substrate  201 . The electrode terminals  208  of the flexible film wiring substrate  204  are connected with the electrodes  210  of the recording device substrate  201  by ILB (inner lead bonding) of the terminals of TAB (tape automated bonding). 
     The recording device substrate  201  is fitted to the flexible film wiring substrate  204  as shown FIGS. 12A and 12B such that the electrodes  210  of the recording device substrate  201  are connected to the electrode terminals  208  of the flexible film wiring substrate  204  and the orifice face  207  is fitted to the aperture of the flexible film wiring substrate  204 . To prevent corrosion of the electrodes and underlying metallic materials thereof by deposition of splashed liquid droplets from the discharge opening or by repelled ink from a recording medium, the electrode portions are coated and sealed with a sealing material  211  such as an epoxy resin which has sufficient sealing and ion-intercepting properties. In this structure, the recording liquid is supplied from an ink supply opening  203  to an ink flow path  209  communicating with ink discharge openings  202 , and liquid droplets are discharged through the discharge openings  202 . 
     In recent years, with the progress of ink-jet recording head in high speed recording and multi-color recording, an ink supplying-holding member ( 212  in FIG. 10) has come to be employed which holds plural flexible film wiring substrates  204  holding plural recording device substrates. In such a case, as shown in FIG. 13, the input terminals  204 ′ of the flexible film wiring substrate  204  are connected to the output terminals  206 ′ of the wiring substrate  206  by solder  213 , and a flux is used as an active agent for removal of an oxide film and stains. 
     The above-mentioned ink-jet recording head has problems of low printing quality and low reliability as described below. 
     (1) The flexible film wiring substrate is connected with the wiring substrate by use of solder, and an oxide film or a stain is removed by a flux. It causes splashing of flux during the soldering to cause clogging of the discharge opening of the recording device substrate to lower the print quality. 
     (2) A flux residue  211  as shown in FIG. 13 after the soldering generates an ionic gas. The gas molecules adhere to the periphery of the discharging openings to lower the ink-repellency, or permeate into the discharge openings and adheres to the electrothermal converting elements to lower the electrothermal conversion efficiency, which lowers the printing quality. 
     (3) The process for coating the electrode portion with the sealant in connection of the recording device substrate  201  with the flexible film wiring substrate  204  requires generally a counter measure against heat. A volatile low molecular component or solvent in the sealant may adhere the orifice face, nozzle inner walls, and electrothermal converting element surfaces during the curing of the sealant, which changes the wettability of these portions to the ink to deteriorate remarkably the printing quality. 
     (4) The sealant for the electrode portions of the recording device substrate  201  and of the flexible film wiring substrate  204  will protrude from the orifice face  207 . The distance between the head and the recording medium should be made larger corresponding to the protrusion. 
     (5) The aforementioned protrusion may cause trouble in wiping of the orifice face  207  by a rubber blade in removing ink droplets and dusts such as paper powder therefrom. This results in adverse effects on printing quality. 
     (6) The inner lead bonding (ILB) by tape automated bonding (TAB) requires a high temperature above 350° C. or a supersonic working for metallic bond formation, which may cause deterioration of the nozzle member material, weakening of the adhesion between the orifice face and the underlying face, and lowers the reliability of the nozzle, thereby lowering the printing quality. 
     (7) In the ILB bonding by the TAB method, the plural rows of electrode terminals  208  cannot readily be arranged close to each other on the flexible film wiring substrate  204 . This makes difficult the increase of arrangement density of the electrode terminals  208 , or the connection density between the electrodes  210  of the recording device substrate  201 . 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide an ink-jet recording head which solves the aforementioned problems and conducts recording with high reliability and without deterioration of printing quality. Another object of the present invention is also to provide an ink-jet recording apparatus employing the above recording head. 
     To accomplish the objects as described above, according to a first aspect of the present invention, there is provided an ink-jet recording head comprising at least one recording device substrate for discharging a recording liquid by pressure of bubble formation caused by thermal energy, a flexible film wiring substrate for fitting the recording device substrate thereto, an electrode pad for receiving control signals from outside for controlling thermal energy generation in the recording device substrate, and a wiring substrate connected electrically to the recording device substrate with interposition of the flexible film wiring substrate, wherein an input terminal of the flexible film wiring substrate and an output terminal of the wiring substrate are electrically connected to each other and fixed by a thermosetting adhesive by hot-pressing, and the connected electrode portion is coated with the thermosetting adhesive. 
     In the above ink-jet recording head, an electrode terminal of the flexible film wiring substrate and an electrode of the recording device substrate may be electrically connected to each other and fixed by a thermosetting adhesive by hot-pressing, and the connected electrode portion may be coated with the thermosetting adhesive. 
     In the above ink-jet recording head, the electrode portion connected and fixed by the thermosetting adhesive may be further sealed with a sealant. In this case, the thermosetting adhesive may be mainly composed of an epoxy resin, and the sealant may be mainly composed of a silicone resin. The protrusion of the thermosetting adhesive from the edge portion of the flexible film wiring substrate may be limited, for example, to be not more than 0.5 mm. 
     The above ink-jet recording head may be constructed such that the recording device substrate is held on a liquid supplying-holding member for supplying the recording liquid to the recording device substrate, and the wiring substrate is held in a face adjacent to the recording device substrate-holding face of the liquid supplying-holding member. 
     The above ink-jet recording head may be constructed such that the input terminal portion of the flexible film wiring substrate is fixed between the input terminal provided at the reverse face of the wiring substrate and the liquid supplying-holding member. 
     According to a second aspect of the present invention, there is provided an ink-jet recording head comprising a recording device substrate for discharging a recording liquid by pressure of bubble formation caused by thermal energy, and a flexible film wiring substrate for fitting the recording device substrate thereto, wherein an electrode terminal of the flexible film wiring substrate and an electrode of the recording device substrate is connected electrically to each other and fixed by a thermosetting adhesive by hot-pressing, and the connected electrode portion is coated with the thermosetting adhesive. 
     According to a third aspect of the present invention, there is provided a process for producing an ink-jet recording head comprising a recording device substrate for discharging a recording liquid by pressure of bubble formation caused by thermal energy, a flexible film wiring substrate for fitting the recording device substrate thereto, an electrode pad for receiving control signals from outside for controlling thermal energy generation in the recording device substrate, and a wiring substrate connected electrically to the recording device substrate with interposition of the flexible film wiring substrate, which process comprises the steps of: 
     applying a thermosetting adhesive to at least one of an input terminal of the flexible film wiring substrate and an output terminal of the wiring substrate; 
     electrically connecting the input terminal to the output terminal by hot-pressing to fix the input terminal and output terminal in an electric connection state. 
     The ink-jet recording head according to the above first, second and third embodiments may be constituted such that the electrodes of the recording device substrate are formed along the outer peripheral portion of the substrate, the electrode terminals of the flexible wiring substrate are formed at the positions counter to the above electrodes on the reverse face of the substrate, and the electrode terminals and the electrodes are respectively connected electrically and fixed by a thermosetting adhesive by hot-pressing. 
     The above ink-jet recording head may be constituted such that the electrodes of the recording device substrate are formed in plural rows along the sides of the substrate, the electrode terminals of the flexible wiring substrate are formed at positions counter to the above electrodes on the reverse face of the substrate, and the electrode terminals and the electrodes are respectively fixed and connected electrically by a thermosetting adhesive by hot-pressing. 
     The electrode portions coated with the adhesive may be made lower than the height of the orifice face of the recording device substrate having discharge openings for discharging the liquid. 
     The thermosetting adhesive may be an anisotropic electroconductive adhesive containing electroconductive particles, and the electric connection may be conducted by the electroconductive particles. 
     According to a further aspect of the present invention, there is provided an ink-jet recording apparatus which employs any one of the above ink-jet recording heads set on a carriage capable of reciprocating in the secondary recording direction to conduct recording on a recording medium. 
     In the present invention, as described above, the flexible film wiring substrate is connected to the wiring substrate by use of a thermosetting adhesive or an anisotropic conductive adhesive containing a particulate electroconductive material by hot pressing instead of conventional solder connection, and the connected electrode portions are covered with the adhesive, whereby direct finger contact or ink deposition to the electrode portions is prevented. In the present invention, since no solder is used for the connection, removal of an oxide film and dirt on the electrode portions need not be conducted, and clogging of ink discharge opening of the recording device substrate which will be caused by splashing of flux on soldering does not occur and therefore deterioration of the printing quality does not occur. Decrease of ink repellency by attachment of an ionic gas generated from the residual flux after soldering to the vicinity of the discharge opening does not occur. Decrease of the heat conversion efficiency by attachment of the gas intruding into the ink discharge opening to the electrothermal converting element does not occur. 
     In the present invention, the electrode portions need not be sealed with a sealant differently from the conventional recording head, since the electrodes of the flexible film wiring substrate and the electrodes of the recording device substrate are connected electrically and fixed by use of a thermosetting adhesive by hot pressing. Since in the present invention not employing the sealant, a volatile low molecular component or a solvent component is not attached to to the orifice face, the nozzle inside walls, or the surface of the electrothermal converting elements, serious deterioration of printing quality owing to change in ink-wettability does not occur. 
     In the constitution of the present invention, the electrode portions coated with an adhesive are formed lower than the level of the orifice face having discharge openings. Therefore, the interspace between the head and the recording medium can be determined by the distance between the orifice face and the recording medium. The coated electrode portions are at a level lower than the orifice face, therefore, no trouble being caused in cleaning of the orifice face by a rubber blade. 
     In the constitution of the present invention in which the electrode terminals of the flexible film wiring substrate and the electrodes of the recording device substrate are connected electrically and fixed by an anisotropic conductive adhesive containing a particulate electroconductive material by hot pressing, neither a high temperature treatment at 350° C. or higher nor a supersonic treatment is conducted for the intermetallic bonding. Therefore, the nozzle member formed on the orifice face does not deteriorate, or the adhesion of the orifice face to the underlaying layer is not weakened, thereby the nozzle reliability being not impaired differently from conventional techniques. 
     In conventional recording heads, the electrode terminals of the flexible film wiring substrate protrude from the organic base material, so that it is extremely difficult to form the electrodes in plural rows along the sides of the recording device substrate to increase the connection densities of the electrodes. In the present invention, the electrode terminals of the flexible film wiring substrate are provided on the reverse face of the substrate, whereby the electrodes of the recording device substrate can be formed in plural rows along the side of the substrate to increase the electrode connection density. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1A is a perspective view for explaining an ink-jet recording head of Example 1 of the present invention, and 
     FIG. 1B is a sectional view taken along the plane  1 B in FIG.  1 A. 
     FIG. 2 is a sectional view of the portion of the head taken along the plane  2  of FIG.  1 A. 
     FIG.  3 A and FIG. 3B are views for explaining combination of a recording device substrate with a flexible film wiring substrate, FIG. 3A is a perspective view showing a separated state, and FIG. 3B is a perspective view of a combined state. 
     FIG. 4 is a sectional view taken along the line  4 — 4  in FIG.  3 B. 
     FIG.  5 A and FIG. 5B are views for explaining connection of a flexible film wiring substrate with a recording device substrate in which electrodes are formed along the periphery of the recording device substrate, FIG. 5A is a perspective view showing a separated state, and FIG. 5B is a perspective view showing a combined state. 
     FIG.  6 A and FIG. 6B are views for explaining connection of a flexible film wiring substrate with a recording device substrate in which electrodes are formed in plural rows along the periphery of the recording device substrate, FIG. 6A is a perspective view showing a separated state, and FIG. 6B is a perspective view showing a combined state. 
     FIG. 7 is a perspective view of an ink-jet recording head of Example 2 of the present invention. 
     FIG. 8A is a sectional view taken along the plane  8 A in FIG. 7, and 
     FIG. 8B is a sectional view taken along the plane  8 B in FIG.  7 . 
     FIG. 9 is an external perspective view of an example of an ink-jet recording apparatus (IJRA) equipped with a recording head of the present invention as the ink-jet head cartridge (IJC). 
     FIG. 10 is a perspective view of a side shooter type recording head. 
     FIG. 11 illustrates a concrete structure of a recording device substrate and a flexible film wiring substrate. 
     FIG. 12A is a perspective view showing combination of a recording device substrate with a flexible film wiring substrate, and 
     FIG. 12B is a sectional view taken along the line  12 B— 12 B in FIG.  12 A. 
     FIG. 13 is a sectional view taken along the plane  13  in FIG.  10 . 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The embodiments of the present invention are described by reference to drawings. 
     EXAMPLE 1 
     FIG. 1A is a perspective view of an ink-jet recording head of Example 1 of the present invention, and FIG. 1B is a sectional view taken along the plane  1 B in FIG.  1 A. 
     In FIG. 1A, plural discharge openings  2  are formed for discharging ink at the central portion on the front face of a recording device substrate  1 . On the reverse face of the substrate, an ink-supplying opening  3  (broken line in the drawing) is provided in a length nearly equal to the length of the row of the discharge openings. An ink supplying-holding member  18  holds three recording device substrates  1 , and recording liquid is supplied to the respective recording device substrate  1 . In a multi-color head, respective color recording liquids are separately held in respective color-recording device substrates  1  of the ink supplying-holding member  18 . In a high-speed head, the ink supplying-holding member  18  holds single color recording liquid. 
     For ink discharge, electrodes on the recording device substrate  1  are electrically connected to electrode terminals on a flexible film wiring substrate  4 . The input terminals of the flexible film wiring substrate are electrically connected to output terminals of a wiring substrate  6  having external input pads  5  for inputting electric signals of recording information and the like from a recording apparatus body to the ink-jet recording head. 
     The connection portions of the input terminals of respective flexible film wiring substrates  4  with the output terminals of the wiring substrate  6  are covered with a sealant  11  to prevent direct finger touch and ink attachment to the connection portion. The recording device substrates are held by the ink supplying-holding member  18  on a different face from the wiring substrate  6  on the ink supplying-holding member  18 . With this constitution, the ink discharge direction (recording paper face) is different from the connection direction of the input pads  5  on the wiring substrate  6 , thereby freedom in design of the paper feeding mechanism being increased. 
     As shown in FIG. 1B, the output terminals  6 ′ of the wiring substrate  6  and the input terminals  4 ′ of the respective flexible film wiring substrates are connected electrically and fixed by hot pressing with an anisotropic conductive adhesion film composed of electroconductive particles  9 ′ and an adhesive  9 ″. In the connection and fixation by the anisotropic conductive adhesion film  9  by hot pressing, the terminals ( 4 ′,  6 ′) are electrically connected by the electroconductive particles  9 ′ and are fixed by the adhesive  9 ″, while the non-terminal portions are fixed by the adhesive  9 ″ without electrical connection. 
     The aforementioned anisotropic conductive adhesion film  9 , for example, may be composed mainly of electroconductive nickel particles of primary diameter of 2 to 6 μm and an epoxy resin. By use of an anisotropic conductive adhesion film  9 , the gold-plated output terminals  6 ′ of the wiring substrate  6  and the gold-plated input terminals  4 ′ of the respective flexible film wiring substrate are hot-pressed at a temperature of from 17° C. to 250° C. under a pressure of about 4 MPa. Thereby satisfactory electric connection and fixation can be achieved with a resistance of not higher than 10 mΩ for one terminal (terminal width: 170 μm). 
     As described above, the anisotropic conductive adhesion film  9  as the connecting material renders unnecessary the use of a flux as the active material for removing an oxide film and dirt from the terminal portions, thus eliminating the adverse effects of splashing of the flux and ionic gas generation from the residue of the flux. 
     The sealing agent  11 , when applied on the anisotropic adhesive film  9 , tends to be repelled to make instable the application of the sealing agent. Therefore, preperably the anisotropic conductive adhesion film  9  is not exposed to the outside of the flexible film wiring substrate  4 . Specifically, as shown in FIG. 2, the sealing agent  11  can be stably applied by decreasing the length of protrusion of the anisotropic conductive adhesive  9  from the end of the flexible film wiring substrate  4 . Experimentally, when the sealing agent  11  is mainly composed of the aforementioned epoxy resin, direct finger touch and attachment of splashed ink onto the terminal connection portions can be prevented by controlling the length of protrusion of the anisotropic conductive adhesive  9  from the end of the flexible film wiring substrate  4  to be not more than 0.5 mm. 
     In the above example, the anisotropic conductive film containing electroconductive particles is used for electric connection and fixation of the input terminals  4 ′ of the flexible film wiring substrate  4  and the output terminals  6 ′ of the wiring substrate  6 . Alternatively, the electrical connection and fixation may be made by use of a thermosetting adhesive which contains no electroconductive particle by hot pressing. 
     Next, the connection of the recording device substrate  1  and the flexible film wiring substrate  4  is explained. 
     FIGS. 3A and 3B illustrate structure of the connection between the recording device substrate  1  and the flexible film wiring substrate  4 . FIG. 3A shows a separated state, and FIG. 3B shows the state of the recording device substrate fitted to the flexible film wiring substrate. FIG. 4 is a sectional view taken along the line  4 — 4  in FIG.  3 B. 
     A plurality of electrothermal converting elements (not shown in the drawing) are formed on the surface of the recording device substrate  1 . Ink flow paths  19  are formed in the regions having the electrothermal converting elements. Plural discharge openings  2  are formed on the orifice face  7  constructing the ceiling of the ink paths  19  corresponding to the respective electrothermal converting elements. The ink paths  19  communicate to an ink supply opening  3  for supply of the recording liquid. 
     On the end of the face of the recording device substrate  1 , plural electrodes  10  are provided, in a row, which receive electric signals for controlling energy generation in the aforementioned electrothermal converting elements. The flexible film wiring substrate  4  has an aperture to uncover the orifice face  7  having the discharge openings  2  when the recording device substrate  1  is fitted thereto. On the reverse face of the substrate around the aperture, electrode terminals  8  are provided to be connected to the electrodes  10  of the recording device substrate  1 . 
     The recording device substrate  1  is connected and fixed as shown in FIG. 4 by applying an epoxy type thermosetting adhesive  20  (or placing semi-cured thermosetting adhesive  20 ) on the portions of the electrodes  10  of the recording device substrate  1 , or the electrode terminals  8  of the flexible film wiring substrate  4 ; positionally registering and temporarily bonding the electrodes  10  and the electrode terminals  8 ; and hot pressing with a heating jig from the side of the flexible film wiring substrate  4 . Experimentally, the electrodes  10  and the electrode terminals  8  were connected electrically satisfactorily and fixed sufficiently under a pressure of 2 to 6 MPa at a resin-heating temperature of 160° C. to 220° C. for 2 to 10 seconds. 
     In this example, the total of the thicknesses of the electrode  10 , the electrode terminal  8 , and the base film  8 ′ is adjusted to be smaller than the height of the orifice face  7 . Specifically, the electrode  10  on the recording device substrate  1  has a thickness of 10 to 40 μm, the electrode terminal  8  on the back face of the flexible film wiring substrate  4  has a thickness of 12 to 45 μm, the base film  8 ′ which is made of an organic resin and is a base of the flexible film wiring substrate has a thickness of 12 to 50 μm, and the orifice face  7  has a height of 20 to 50 μm. This constitution in which the total of the thicknesses of the electrode  10 , the electrode terminal  8 , and the base film  8 ′ is smaller than the height of the orifice face  7  facilitates wiping with a rubber blade to remove ink drops and dirt such as paper powder adhering to the orifice face  7 . 
     Further, the connection portions (electrode portions) between the electrode  10  and the electrode terminal  8  are fixed and completely covered with the thermosetting adhesive  20 . Thereby, direct finger touch with the electrode portion or ink attachment thereto is prevented. Thus, sealing of the electrode portions with a sealant is not necessary, and the sealing process is not required. 
     The thermosetting adhesive  20  may be an anisotropic conductive adhesive containing electroconductive particles, and the electrodes  10  and the electrode terminals  8  may be electrically connected and fixed by the anisotropic conductive adhesive by hot pressing. In such connection and fixation by hot pressing with anisotropic conductive adhesive, the electrodes  10  and the electrode terminals  8  are electrically connected by the electroconductive particles and fixed by the adhesive, and in the portions where the terminal is not provided, the base film and the recording device substrate are bonded together by the adhesive without electric connection by electroconductive particles. 
     With the constitution in which the electrode terminals  8  are provided on the reverse face of the flexible film wiring substrate  4  and are connected and fixed to the electrodes  10  of the recording device substrate  1  by an adhesive, the electrodes  10  and the electrode terminals  8  can be arranged as desired corresponding to the design. 
     In FIGS. 5A and 5B, for example, the electrodes  10  are formed along the periphery of the recording device substrate  4 , and the electrode terminals  8  are formed around the aperture on the back face of the flexible film wiring substrate  4  corresponding to the positions of the electrodes  10 . In this constitution, the recording device substrate  1  is bonded along the entire periphery to the flexible film wiring substrate  4  to improve the adhesion strength between the substrates without a vent formation, causing neither penetration nor attachment of the recording liquid through the vent hole. 
     In FIGS. 6A and 6B, the electrodes  10  are formed in plural rows to increase the electrical connection density between the recording device substrate  1  and the flexible film wiring substrate  4 . Such construction cannot readily be achieved in the structure shown in aforementioned FIG. 11 in which the electrode terminals  8  of the flexible film wiring substrate  4  protrude from the organic material substrate to the aperture. In this example, such a construction can be realized by providing the electrode terminals  8  on the reverse face of the flexible film wiring substrate  4  and connecting and fixing the electrode terminals to the electrode  10  of the recording device substrate  1  with an adhesive. 
     EXAMPLE 2 
     In the structure in which the wiring substrate  6  and the recording device substrates  1  are held on separate planes, the flexible film wiring substrate should be tightly held and protected in consideration of the connection with connector parts for external input pads for application of electric signals of recording information from the recording apparatus body to the ink-jet recording head. 
     FIG. 7 is a perspective view of an ink-jet recording head of this Example 2 of the present invention. FIG. 8A is a sectional view taken along the plane  8 A in FIG. 7, and FIG. 8B is a sectional view taken along the plane  8 B in FIG.  7 . In these drawings, the same reference numbers are used for the same members as in FIG.  1 . 
     In the recording head of this example, as shown in FIGS. 7,  8 A, and  8 B, the input terminal  4 ′ of the flexible film wiring substrate  4  having the recording device substrates  1  fitted thereto is held between an output terminal  6 ′ provided on the reverse face of the wiring substrate  6  having many external input pads  5  and an ink supplying-holding member  18 . An anisotropic conductive adhesion film  9  is provided between the input terminal  4 ′ of the flexible film wiring substrate  4  and the output terminal  6 ′ of the wiring substrate  6  to connect electrically and fix the terminals ( 4 ′ and  6 ′) by hot pressing. 
     In the above constitution, the input terminals  4 ′ of the flexible film wiring substrate  4  are held tightly and protected between the output terminals  6 ′ on the reverse face of the wiring substrate  6  and the ink supplying-holding member  18 . Thereby direct finger touch or ink attachment is prevented. The anisotropic conductive adhesion film  9 , which electrically connects and fixes the terminals ( 4 ′,  6 ′), offsets the adverse effects of a splashed flux and an ionic gas evolved from the residue of the flux. 
     In Example 1 as described above, the connection portions of the input terminal of the flexible film wiring substrate  4  with the output terminal of the wiring substrate  6  are coated with a sealing agent  11  to prevent direct finger touch and ink penetration. In this Example also, the coating of the terminal connection portions with a sealing agent will prevent the penetration of ink and improve further the reliability of the terminal connection portions. 
     The above Examples describe a side-shooter type recording head. The present invention also can be applied to an edge-shooter type of recording head, thereby obtaining the same effect as of the side-shootor type. 
     The present invention also can be applied to a flexible film wiring substrate of a TCP (tape carrier package) having a recording device substrate fitted thereto by a TAB process to prevent deterioration of the printing quality. 
     The recording with the recording head of the present invention can be carried out on a recording medium such as paper, thread, fiber, cloth, leather, metal, plastics, glass, wood, ceramics or the like. 
     The recording liquid for the recording head of the present invention is not limited to ink, and any material is useful which can be discharged and conduct recording on the above recording medium. 
     Ink-Jet Recording Apparatus 
     An ink-jet recording apparatus employing the ink-jet head of the above examples is described below. 
     FIG. 9 is an perspective external view of an example of an ink-jet recording apparatus (IJRA) employing an ink-jet recording head of the present invention as an ink-jet head cartridge (IJC). 
     In FIG. 9, an ink-jet head cartridge (IJC)  120  has nozzles for discharging ink onto a recording face of a recording paper sheet fed onto a platen  124 . A carriage HC  116  holds IJC  120 , and is slidable along two parallel guide shafts  119 A and  119 B by a driving belt  118  driven by a motor  117 . Thereby, the IJC  120  can reciprocate over the entire breadth of the recording paper sheet. 
     A head recovery device  126  is placed at an end of the moving route of the IJC  120 , for example, in opposition to the home position thereof. The head recovery device  126  is operated by the driving force applied through a transmission mechanism  123  to conduct capping of the IJC  120 . Simultaneously with the capping of IJC  120  by the cap portion  126 A of the head recovery device  126 , a discharge recovery treatment is conducted such that the thickened ink is removed forcibly from the nozzle by sucking of the ink by a sucking means provided in the head recovery device  126  or by feeding of ink by a pressurizing means provided in the ink feeding path to the IJC  120 . The IJC after the recording is protected by capping. 
     A blade  130  made of a silicone rubber is placed as a wiping member at the side of the head recovery device  126 . The blade  130  is held by a blade-holding member  130 A in a cantilever state, and driven by the motor  122  and the transmission mechanism  123  similarly as the head recovery device  126  to fit to the discharging face of the IJC  120 . The blade  130  is allowed to protrude to the movement route of the IJC  120  at a suitable time during the recording operation of IJC  120  or after the discharge recovery by the head recovery device  126  to wipe off condensed dew, wet, or dirt on the discharge face of the IJC  120 . 
     The above ink-jet recording apparatus is applicable to various apparatuses such as printers, copying machines, facsimile machines having a communication system, and word processors having a printer, and industrial recording apparatuses combined with other treatment apparatus. 
     As described above, the present invention makes unnecessary the use of a flux to remove an oxide film or dirt, thereby preventing clogging of the discharge opening of the recording device substrate by a splashed flux; preventing attachment of ionic gas molecules evolved from residual flux after soldering to the vicinity of the discharge opening, which causes lowering of the water repellency of the ink; or preventing attachment of the ionic gas molecules to the electrothermal converting element through the discharge opening, which causes lowering of the printing quality. Thus, an ink-jet recording head with high reliability can be provided. 
     In the present invention, the connection portions of electrode terminals of the flexible film wiring substrate with the electrodes of the recording device substrate need not be sealed with a sealant. Therefore, deterioration of printing quality owing to change in ink-wettability does not occur which may be caused by attachment of a volatile low molecular component or a solvent component to the orifice face, the nozzle inside walls, or the surface of the electrothermal converting elements. Thereby, printing can be conducted stably with high quality. 
     In the constitution of the present invention, the electrode portions coated with an adhesive are formed lower than the level of the orifice face having discharge openings. Therefore the interspace between the head and the recording medium can be determined by the distance between the orifice face and the recording medium, so that the head portion can be constituted more compactly. Further, the coated electrode portions are at a level lower than the orifice face, therefore, no trouble being caused in cleaning of the orifice face by a rubber blade. 
     In the constitution of the present invention in which the electrode terminals of the flexible film wiring substrate and the electrodes of the recording device substrate are connected electrically and fixed by an anisotropic conductive adhesive containing electroconductive particles by hot pressing, a high temperature treatment at 350° C. or a supersonic treatment is not required for the intermetallic bonding. Therefore, the nozzle member formed on the orifice face does not deteriorate, or the adhesion of the orifice face to the underlaying layer is not weakened, thereby the nozzle reliability being not impaired. 
     In conventional recording heads, the electrode terminals of the flexible film wiring substrate protrude from the organic base material, so that it is extremely difficult to form the electrode terminals in plural rows along the sides of the recording device substrate to increase the connection densities of the electrodes. In the present invention, the electrode terminals of the flexible film wiring substrate are provided on the reverse face thereof, whereby the electrodes of the recording device substrate can be formed in plural rows along the side of the substrate to increase the electrode connection density.