Abstract:
A method for splitting a piezoelectric device used in substitution for dicing for shortening the processing time as compared to a case of using the dicing to improve productivity to enable the shape of the piezoelectric device more suited to the emission shape of a solution to be achieved, and a method for manufacturing a printer device whereby a narrower nozzle pitch may be achieved. A resist  201  is formed at a pre-set position on a major surface of the piezoelectric device  43  bonded to a vibrating plate. Using this resist  201  as a mask, powders or particles are sprayed onto the piezoelectric device  43  for removing the portion of the piezoelectric device  43  not carrying the resist  201  to form the piezoelectric device  35  of a desired shape at a pre-set position.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the invention 
     This invention relates to a method for manufacturing a printer device, such as a method for manufacturing a printer device applied to an on-demand ink jet printer device (termed herein simply an ink jet printer device), or an on-demand carrier jet printer device (termed herein simply a carrier jet printer device). 
     2. Description of Related Art 
     Heretofore, this type of the ink jet printer device is such a printer device in which ink liquid droplets are emitted via an ink emission hole responsive to a recording signal for printing an image on recording mediums, such as paper sheets or films. The ink jet printer device is recently coming into widespread use because it lends itself to reduction in size and cost. 
     In this ink jet printer device, a method employing a heating element and a method employing a piezoelectric device is customarily used as a method for emitting ink liquid droplets. 
     The method employing the heating element emits the ink liquid droplets via an ink emission hole under a pressure of bubbles generated on heating the ink by the heating element to ebullition. 
     The method employing the piezoelectric device deforms the piezoelectric device to pressurize an ink pressurizing chamber charged with the ink to emit ink liquid droplets at the ink emission hole via ink entry holes formed in the ink pressurizing chamber. 
     This method employing the piezoelectric device may be enumerated by a method of linearly displacing a layered piezoelectric device made up of three or more piezoelectric devices bonded to a vibrating plate for thrusting the ink pressurizing chamber via the vibrating plate, and a method of applying a voltage across a single-layer piezoelectric device or double-layer piezoelectric devices bonded to the vibrating plate to warp the vibrating plate to thrust the ink pressurizing chamber. 
     In the latter method, that is the method of applying a voltage across a single-layer piezoelectric device or double-layer piezoelectric devices bonded to the vibrating plate to warp the vibrating plate to thrust the ink pressurizing chamber, an expensive layered piezoelectric device is not used, so that the manufacturing costs can be lowered. This method, however, has a drawback that fine pitch is difficult to realize at the time of bonding the sliced single-layer piezoelectric device or double-layered piezoelectric devices to the vibrating plate. Moreover, if a paste-like piezoelectric material is applied to the vibrating plate, such as by coating, and fired to produce a piezoelectric device, the firing temperature of not less than 1000° C. is difficult to set, in view of thermal resistance proper to the vibrating plate, such that characteristics of the piezoelectric material cannot be exhibited sufficiently. 
     In addition, if, after bonding the piezoelectric material to the vibrating plate, the piezoelectric material is cut to plural piezoelectric devices, the piezoelectric material is difficult to cut to a constant depth at all times, due to abrasion of cutting tools or processing tolerances of machine tools, thus occasionally damaging the vibrating plate. 
     For overcoming the above problems, the present Assignee proposed in Japanese patent Application Nos.7-193366, 7-1922201 and 7-190750 an inexpensive ink jet printer head employing a single-layer or double-layer piezoelectric device, in which the printing process can be stabilized and characteristics of the piezoelectric material can be exhibited while the fine pitch can be coped with. 
     However, the method for splitting the piezoelectric material disclosed in the above-referenced publications is such a method in which the piezoelectric material bonded on the vibrating plate by an electrically conductive adhesive is split by a dicing device, that is such a method in which a rotating blade is in a stationary position and a work, that is a piezoelectric device, is set on a stage and moved in this state in a one-dimensional direction, that is lineally, as shown in FIG.  1 . Thus, the processing shape is limited to a linear shape such that the shape of the piezoelectric device after splitting is comprised of linear sides. 
     Since the site that can be machined by each stage movement is determined by the number of the rotating blades, the number of piezoelectric devices that can be obtained by splitting is governed by the number of blades that can be driven at a time, such that tens of piezoelectric devices cannot be obtained at a time by splitting. 
     On the other hand, the spacing per piezoelectric device obtained by dicing is broader by approximately tens of micrometers than the width of the blade used for dicing, so that, if the blade 50 μm in width is used, the spacing is limited to approximately 70 μm. Also, if the width of the blade used for dicing is reduced to the smallest value possible, the amount of abrasion of the dicing blade is increased, as a result of which the blade width needs to be set to not smaller than 100 μm and hence the spacing of the split piezoelectric devices needs to be set to not smaller than 120 μm, such that the desired narrow pitch cannot be achieved. 
     SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide a splitting method which may be used in place of dicing for the splitting process of the piezoelectric devices and to provide a method for manufacturing a printer device in which the processing time can be shortened as compared to the splitting method by dicing, the shape of the piezoelectric device more suited to the liquid emitting shape can be realized in place of the linear shape that can be achieved with the conventional method, and in which the spacing between piezoelectric devices can be set so as to be narrower than the blade width. 
     The method for manufacturing the printer device according to the present invention resides in forming a resist at a pre-set position on a major surface of the piezoelectric device bonded to a vibrating plate. Using this resist as a mask, powders or particles are sprayed onto the piezoelectric device for removing the portion of the piezoelectric device not carrying the resist to enable the piezoelectric device of a desired shape to be formed at a pre-set position. 
     With the present manufacturing method for the printer device, since the number or the shape of the piezoelectric devices produced depends only on the resist distribution, a large number of the piezoelectric devices can be produced simultaneously to shorten the processing time to improve productivity. Moreover, the piezoelectric device of an optional shape may be manufactured. 
     In addition, with the preset manufacturing method, the separation between neighboring piezoelectric devices can be easily comprised within the width of not more than 10 μm, while the nozzle pitch may be reduced. 
     Also, with the present manufacturing method for the printer device, abrasion to the tool need not be taken into account when manufacturing the piezoelectric device, so that more emphasis can be placed on the ink emission performance in designing. 
     Further, with the present manufacturing method for the printer device, substantially the entire surface of the piezoelectric material bonded on the vibrating plate can be processed thus significantly reducing the working time. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view showing the state of forming a piezoelectric device by dicing for illustrating the conventional manufacturing method for a printer device. 
     FIG. 2 is a perspective view showing essential parts of a serial type ink jet printer device according to a first embodiment of the present invention. 
     FIG. 3 illustrates the structure of a controller of the printer device. 
     FIG. 4 is a longitudinal cross-sectional view of an ink jet printer head of the printer device. 
     FIG. 5 is a plan view schematically showing an ink jet printer head of the printer device. 
     FIGS. 6A and B illustrate the operation of the ink jet printer head of the printer device, wherein FIG. 6A is a longitudinal cross-sectional view showing the state in which the ink pressurizing chamber is increased in volume and FIG. 6B is a longitudinal cross-sectional view showing the state in which the ink pressurizing chamber is decreased in volume. 
     FIGS. 7A, B, C, D and E illustrate the manufacturing process for the ink jet printer head of the printer device, wherein FIG. 7A is a longitudinal cross-sectional view showing the state in which a resist has been formed on a metal member, FIG. 7B is a longitudinal cross-sectional view showing the state in which etching has been effected using the resist as a mask, FIG. 7C is a longitudinal cross-sectional view showing the state in which a resin material has been bonded to the metal member freed of the resist, FIG. 7D is a longitudinal cross-sectional view showing the state in which a liquid-repellant film has been formed on the resin material and FIG. 7E is a longitudinal cross-sectional view showing the state in which ink emission holes have been formed in the resin material and in the liquid-repellant film. 
     FIGS. 8A,  8 B,  8 C,  8 D and  8 E illustrate the manufacturing process for an ink jet printer head of the printer device, wherein FIG. 8A is a longitudinal cross-sectional view showing the state in which the piezoelectric material has been bonded to the vibrating plate, FIG. 8B is a longitudinal cross-sectional view showing the state in which a resist having a pre-set pattern has been formed on the major surface of the piezoelectric material, FIG. 8C is a longitudinal cross-sectional view showing the state in which a powders have been sprayed to form a resist, using the resist as a mask, FIG. 8D is a longitudinal cross-sectional view showing the state in which etching has been effected using the resist as a mask for removing the second vibrating plate and FIG. 8D is a longitudinal cross-sectional view showing the state in which the resist has been removed using the solution for removal. 
     FIGS. 9A and 9B illustrate the manufacturing method for the ink jet printer head of the printer device, wherein FIG. 9A is a longitudinal cross-sectional view showing the state in which the piezoelectric device has been formed on a vibrating plate and FIG. 9B is a longitudinal cross-sectional view showing the state in which the second vibrating plate has been removed by etching using the piezoelectric device as a mask. 
     FIGS. 10A and 10B illustrate the manufacturing process for an ink jet printer head of the printer device, wherein FIG. 10A is a longitudinal cross-sectional view showing the state in which a vibrating plate carrying the piezoelectric device has been bonded to a pressurizing chamber forming member and FIG. 10B is a longitudinal cross-sectional view showing the state in which an ink supply duct has been mounted in position. 
     FIG. 11 is a perspective view showing essential portions of a serial type ‘carrier jet’ printer device according to a second embodiment of the present invention. 
     FIG. 12 illustrates the structure of a controller of the printer device. 
     FIG. 13 illustrates the operation of the controller. 
     FIG. 14 illustrates the timing of the driving voltages applied across the first and second piezoelectric devices. 
     FIG. 15 is a longitudinal cross-sectional view of the ‘carrier jet’ printer head of the printer device. 
     FIG. 16 is a schematic plan view of the ‘carrier jet’ printer head of the printer device. 
     FIGS. 17A,  17 B and  17 C illustrate the operation of the ‘carrier jet’ printer head of the printer device, wherein FIG. 17A is a longitudinal cross-sectional view showing a initial state, FIG. 17B is a longitudinal cross-sectional view showing the state in which the ink pressurizing chamber has been decreased in volume and FIG. 17C is a longitudinal cross-sectional view showing the state in which a dilution liquid pressurizing chamber has been decreased in volume. 
     FIGS. 18A,  18 B,  18 C,  18 D and  18 E illustrate the manufacturing process for the ‘carrier jet’ printer head of the printer device, wherein FIG. 18A is a longitudinal cross-sectional view showing the state in which a resist has been formed on a metal member, FIG. 18B is a longitudinal cross-sectional view showing the state in which etching has been effected using the resist as a mask, FIG. 18C is a longitudinal cross-sectional view showing the state in which a resin material has been bonded to a metal member freed of the resist, FIG. 18D is a longitudinal cross-sectional view showing the state in which a repellant liquid film has been formed on the resin material and FIG. 18E is a longitudinal cross-sectional view showing the state in which an ink emission hole and a dilution liquid emission hole have been formed in the resin material and in the liquid repellant films. 
     FIGS. 19A,  19 B,  19 C,  19 D and  19 E illustrate the manufacturing process of the ‘carrier jet’ printer head of the printer device, wherein FIG. 19A shows the state in which a piezoelectric material has been bonded to a vibrating plate, FIG. 19B shows the state in which a resist having a pre-set pattern has been formed on the major surface of the piezoelectric material, FIG. 19C shows a state in which powders have been sprayed using the resist as a mask to form a piezoelectric device, FIG. 19D shows a state in which the second vibrating plate has been removed by etching using the piezoelectric device as a mask and FIG. 19E shows a state in which the resist has been removed using a removing solution. 
     FIGS. 20A and 20B illustrate the manufacturing process for the ‘carrier jet’ printer head of the printer device, wherein FIG. 20A shows the state in which the piezoelectric device has been formed on the vibrating plate and FIG. 20B shows a state in which the second vibrating plate has been removed by etching using the piezoelectric device as a mask. 
     FIGS. 21A and 21B illustrate the manufacturing process for the ‘carrier jet’ printer head of the printer device, wherein FIG. 21A is a longitudinal cross-sectional view showing the state in which a vibrating plate carrying a piezoelectric device has been bonded to a pressurizing chamber forming member and FIG. 21B is a longitudinal cross-sectional view showing the state in which an ink supply duct and a dilution liquid supply duct have been mounted in position. 
     FIGS. 22A,  22 B,  22 C and  22 D illustrate a manufacturing process for a printer device according to an modification of the present invention, wherein FIG. 22A is a longitudinal cross-sectional view showing the state in which a vibrating plate carrying a piezoelectric material has been bonded to a pressurizing chamber forming member, FIG. 22B is a longitudinal cross-sectional view showing the state in which a resist has been formed on the piezoelectric material, FIG. 22C is a longitudinal cross-sectional view showing the state in which the piezoelectric device has been formed and FIG. 22D is a longitudinal cross-sectional view showing the state in which the ink supply duct has been mounted in position. 
     FIG. 23 is a longitudinal cross-sectional view of an ink jet printer head manufactured in accordance with a modification of the present invention, for illustrating the manufacturing method for this printer device. 
     FIG. 24 is a longitudinal cross-sectional view of a resin material used in the present embodiment for illustrating the manufacturing method of a printer device according to a further modification of the present invention. 
     FIG. 25 is a perspective view showing essential portions of a line type printer device. 
     FIG. 26 is a perspective view showing essential portions of a drum rotation type printer device. 
    
    
     DESCRIPTION OF PREFERRED EMBODIMENTS 
     Referring to the drawings, preferred embodiments of the present invention will be explained in detail. 
     First Embodiment 
     In the first embodiment, the present invention is applied to a serial type ink jet printer device. 
     A serial type ink jet printer device  1 , abbreviated to a printer device  1 , has a cylindrically-shaped drum  2 , on the outer periphery of which a paper sheet pressing controller  3  is mounted in position parallel to the drum  2 , as shown in FIG.  2 . The printer device  1  clamps a printing paper sheet  4 , as a printing support, by the drum  2  and the paper sheet pressing controller  3 , for stationarily pressing the printing paper sheet  4  to the drum  2 . 
     At a small separation from the outer periphery of the drum  2  of the printer device I is mounted a feed screw  5  parallel to the drum  2 . On this feed screw  5  is mounted an ink jet print head  7  via a supporting member  6  meshing with the feed screw  5 . By rotation of the feed screw  5 , the ink jet print head  7  is moved along the axis of the drum  2  indicated by arrow A in FIG. 2 along with the supporting member  6  meshing with the feed screw  5 . 
     The drum  2  is operatively linked with a motor  11  via a first pulley  8 , a belt  9  and a second pulley  10  so as to be rotated in a direction of arrow B in FIG. 2 by rotation of the motor  11 . 
     The printer device  1  is controlled by a controller  20 , as shown in FIG.  3 . The controller  20  is made up of a signal processing control circuit  21 , a driver  22 , a memory  23 , a driving controller  24  and a correction circuit  25 . The signal processing control circuit  21  is comprised of a central processing unit (CPU) or a digital signal processor (DSP) and, on reception from outside of letter printing data, signals of an operating unit and external control signals, as an input signal S 1 , sorts the letter printing data in the letter printing sequence and sends out the sorted letter printing data along with an emission signal via driver  22  to the ink jet print head  7  for driving-controlling the ink jet print head  7 . 
     In this case, the letter printing sequence differs with difference in structure of the ink jet print head  7  and the letter printing section and, moreover, needs to be considered in connection with the inputting sequence of the letter printing data. Therefore, the letter printing sequence is transiently stored in a memory  23  comprised of a buffer memory or a frame memory for later reading. 
     The signal processing control circuit  21  is designed to process the input signal S 1  by software and sends out processed signals as control signals to a driving controller  24 . 
     On reception of the control signals sent from the signal processing control circuit  21 , the driving controller  24  controls the driving or synchronization of the motor adapted for rotationally driving the motor  11  and the feed screw  5 , while also controlling the cleaning of the ink jet print head  7  and supply or ejection of the printing paper sheet  4 . 
     If the printer device  1  is of a multiple-head construction, the signal processing control circuit  21  performs γ-correction, color correction in case of color printing and correction of variations of the ink jet print heads  7  by a correction circuit  25 . In this correction circuit  25 , pre-set correction data are stored in the form of a ROM (read-only memory) map, so as to be read out by the signal processing control circuit  21  depending on external conditions, such as ink emission hole number, temperature or input signals. 
     If the printer device  1  is of a multiple head structure, such that there are a large number of ink emission holes, an IC (integrated circuit) is mounted on the ink jet print head  7  for reducing the number of interconnections to the ink jet print head  7 . 
     In the above-described printer device  1 , the motor is run in rotation by the driving controller  24  responsive to the control signals sent from the signal processing control circuit  21  for rotating the feed screw  5 . On rotation of the feed screw  5 , the ink jet print head  7  of the printer device  1  is moved axially of the drum  2 , along with the supporting member  6 , as the ink is emitted, for printing letters or the like on the printing paper sheet  4  pressed to the drum  2 . The printing direction in which the ink jet print head  7  effects printing on the printing paper sheet  4  as it is moved axially of the drum  2  may be the same direction or the reciprocating direction. 
     In the printer device  1 , when the ink jet print head  7  is moved axially of the drum  2  to print letters of one row on the printing paper sheet  4 , the motor  11  is run in rotation under control by the driving controller  24  to rotate the drum  2  by one row in a direction of arrow B in FIG. 2 in readiness for printing of the next row of letters. 
     Next, the ink jet print head  7  is explained. 
     In the ink jet print head  7 , shown in FIG. 4, a vibrating plate  32  is bonded to a major surface  31   a  of a plate-shaped ink pressurizing chamber forming member  31 , whilst a plate-shape orifice plate  33  is bonded to the opposite side major surface  31   b  of the ink pressurizing chamber forming member  31 . In the ink jet print head  7 , a piezoelectric device  35  is bonded via an electrically conductive adhesive  34  to the major surface  32   a  of the vibrating plate  32  of the double-layered structure. Around a portion of the orifice plate  33  in which is opened an ink emission hole  33   a  as later explained is formed a liquid repellant film  42 . 
     The ink pressurizing chamber forming member  31  is constituted by a metal plate of e.g., stainless steel, with a thickness of approximately 0.1 mm. This ink pressurizing chamber forming member  31  is formed with an ink pressurizing chamber  31   c  for pressurizing the ink charged therein at a pre-set pressure, an ink flow duct  31   d  communicating with one end of the ink pressurizing chamber  31   c  for supplying ink into the ink pressurizing chamber  31   c , an ink inlet duct  31   e  formed at the opposite end of the ink pressurizing chamber  31   c  for operating as a through-hole via which to conduct ink charged into the ink pressurizing chamber  31   c  to the ink emission hole  33   a , an ink buffer tank  31   f  for delivery of the ink to the ink flow duct  31   d  and a connection hole  31   g  for conducting the ink supplied from an ink supply duct  36  into the ink buffer tank  31   f.    
     The ink pressurizing chamber  31   c  is formed for extending from a mid portion in the direction of thickness of the ink pressurizing chamber forming member  31  towards the major surface  31   a  of the ink pressurizing chamber forming member  31 . The ink inlet duct  31   e  is formed on the opposite end of the ink pressurizing chamber  31   c  for extending from the mid portion in the direction of thickness of the ink pressurizing chamber forming member  31  towards the opposite side major surface  31   b  of the ink pressurizing chamber forming member  31 . 
     Similarly to the ink inlet duct  31   e , the ink flow duct  31   d  is formed for extending from the mid portion in the direction of thickness of the ink pressurizing chamber forming member  31  towards its opposite side major surface  31   b . This ink flow duct  31   d  is separated from the ink inlet duct  31   e  via a first member  31   h  as later explained. Also, the ink flow duct  31   d  is formed so that a portion of the first member  31   h  communicates with one end of the ink pressurizing chamber  31   c.    
     Similarly to the ink inlet duct  31   e  and the ink flow duct  31   d , the ink buffer tank  31   f  is formed for extending from the mid portion in the direction of thickness of the ink pressurizing chamber forming member  31  towards its opposite side major surface  31   b . It is noted that the ink buffer tank  31   f  is a sole straight-shaped piping communicating with plural ink flow ducts  31   d , as shown in FIG. 5, and performs the role of distributing the ink to the various ink flow ducts  31   d.    
     The connection hole  31   g  is formed from a mid portion along the thickness of the ink pressurizing chamber forming member  31  to the major surface  31   a  of the member  31  for communication with the ink buffer tank  31   f.    
     The ink pressurizing chamber forming member  31  is made up of a first member  31   h , a second member  31   i , a third member  31   j  and a fourth member  31   k . The first member  31   h , constituting the bottom surface of the ink pressurizing chamber  31   c  and a portion of the opposite side major surface  31   b  of the ink pressurizing chamber forming member  31 , is contacted with a lateral side of the ink inlet duct  31   e  and with a lateral surface of the ink flow duct  31   d  to separate the ink inlet duct  31   e  from the ink flow duct  31   d . The second member  31   i  is contacted with one lateral surface of the ink pressurizing chamber  31   c  and with one lateral surface of the connection hole  31   g  to separate the ink pressurizing chamber  31   c  from the connection hole  31   g . The third member  31   j  is contacted with the opposite side lateral surface of the ink pressurizing chamber  31   c  and the opposite side lateral surface of the ink inlet duct  31   e  and constitutes the major surface  31   a  and a portion of the major surface  31   b  of the ink pressurizing chamber forming member  31 . The fourth member  31   k  is contacted with the lateral surface of the ink buffer tank  31   f  and the opposite side lateral surface of the connection hole  31   g  and constitutes the major surface  31   a  and a portion of the major surface  31   b  of the ink pressurizing chamber forming member  31 . The spacing areas or voids delimited by these first to fourth members  31   h  to  31   k  are constituted as the ink pressurizing chamber  31   c , ink inlet duct  31   e , ink flow duct  31   d , ink buffer tank  31   f  and as the connection hole  31   g.    
     On the opposite side major surface  31   b  of the ink pressurizing chamber forming member  31  is bonded an orifice plate  33 , by thermal pressure bonding, for covering the ink inlet duct  31   e , ink flow duct  31   d  and the ink buffer tank  31   f . The orifice plate  33  is formed of Neoflex (manufactured by MITSUI TOATSU KAGAKU KOGYO KK) excellent in thermal resistance and in resistance against chemicals and having a thickness of approximately 50 μm and a glass transition temperature of not higher than 250° C. 
     This orifice plate  33  is formed with an ink emission hole  33   a  having a cross-sectional shape of a column of, for example, a pre-set diameter. The ink emission hole  33   a  communicates with the ink inlet duct  31   e  for emitting the ink supplied from the ink pressurizing chamber  31   c  via the ink inlet duct  31   e . By having the orifice plate  33  formed with the ink emission hole  33   a , it is possible to assure chemical stability against the ink. 
     The piezoelectric device  35  is formed to a shape in meeting with the shape of the ink pressurizing chamber  31   c , as shown in FIG.  5 . The separation from the neighboring piezoelectric device  35  is set to not larger than 100 μm. 
     The ink pressurizing chamber  31   c  is designed so that its width C 2  at the site of the ink inlet duct  31   e  is smaller than the main width C 1  of the ink pressurizing chamber  31   c  and is larger than the opening diameter A 1  towards the ink inlet duct  31   e  of the ink emission hole  33   a . More specifically, if the main width C 1  of the ink pressurizing chamber  31   c  is set to 0.4 mm to 0.6 mm, the width C 2  at the site of the ink inlet duct  31   e  of the ink pressurizing chamber  31   c  is of the order of 0.2 mm equal to approximately twice the plate thickness of the pressurizing chamber forming member  31 . The width C 2  at the site of the ink inlet duct  31   e  of the ink pressurizing chamber  31   c  is preferably not more than 2.5 times the plate thickness of the pressurizing chamber forming member  31 . 
     The ink emission hole  33   a  is formed for communicating with approximately the mid portion of the ink inlet duct  31   e . The ink emission hole  33   a  is tapered in the direction of ink emission. In the present embodiment, the opening end of the ink emission hole  33   a  has a circular cross-sectional shape approximately 5 μm in diameter, whilst the cross-sectional shape thereof towards the ink pressurizing chamber forming member  31  is circular with the diameter approximately 80 μm. Thus, the width C 2  at the site of the ink inlet duct  31   e  of the ink pressurizing chamber  31   c  is smaller than the main width C 1  of the ink pressurizing chamber  31   c  and larger than the opening diameter A 1  towards the ink inlet duct  31   e  of the ink emission hole  33   a.    
     As shown in FIG. 6A, on the major surface  31   a  of the ink pressurizing chamber forming member  31  is bonded a double-layered vibrating plate  32 , via an adhesive, for closing the opening portion of the ink pressurizing chamber  31   c . The opening portion of the ink pressurizing chamber  31   c  means an area of the ink pressurizing chamber forming member  31  opening in the major surface  31   a.    
     The vibrating plate  32  is of a double-layered structure comprised of a first vibrating plate  32   x  positioned towards the ink pressurizing chamber  31   c  for closing all opening portions of the ink pressurizing chamber  31   c  and a second vibrating plate  32   y  shaped in meeting with the piezoelectric device  35  formed on the vibrating plate  32 . 
     This vibrating plate  32  is formed with a through-hole  32   b  in register with the connection hole  31   g  of the ink pressurizing chamber forming member  31 . In this through-hole  32   b  is fitted an ink supply duct  36  connected to an ink tank, not shown. Therefore, the ink introduced from the ink tank is supplied via the ink supply duct  36  and the ink buffer tank  31   f  into the ink flow duct  31   d  and thence into the ink pressurizing chamber  31   c.    
     In the double-layered vibrating plate  32 , the first vibrating plate  32   x  is formed of Neoflex (manufactured by MITSUI TOATSU KAGAKU KOGYO KK) having excellent thermal resistance and resistance against chemicals, a thickness of approximately 50 μm and a glass transition temperature of not higher than 250° C. The second vibrating plate  32   y  is a copper plate having a thickness of approximately 15 μm. 
     On the major surface of the second vibrating plate  32   y  is bonded the piezoelectric device  35  via an electrically conductive adhesive  34 . Although the vibrating plate  32  in the present embodiment is of a double-layered structure comprised of the first vibrating plate  32   x  and the second vibrating plate  32   y , the vibrating plate  32  may be of a single-layered structure, or of a multi-layered structure comprised of three or more layers. 
     When a driving voltage is applied across the piezoelectric device  35 , in a state shown in FIG. 6A, it is displaced in a direction indicated by arrow A in FIG. 6B to warp the vibrating plate  32  to decrease the volume of the ink pressurizing chamber  31   c  to raise the pressure in the ink pressurizing chamber  31   c.    
     The ink jet print head  7  operates as follows: 
     In the stand-by state, the ink charged into the ink pressurizing chamber  31   c  is in a stabilized state, by equilibrium with surface tension, with a meniscus being formed in the vicinity of the distal end of the ink emission hole  33   a , as shown in FIG.  6 A. 
     For ink emission, the driving voltage is applied across the piezoelectric device  35  for thereby displacing the device  35  in a direction indicated by arrow A in FIG.  6 B. This displacement of the vibrating plate  32  decreases the volume of the ink pressurizing chamber  31   c  to raise the pressure therein to emit the ink via the ink emission hole  33   a . It is noted that time changes of the driving voltage applied to the piezoelectric device  35  are set so that a desired amount of the ink will be emitted via the ink emission hole  33   a.    
     The manufacturing method of the ink jet print head  7  will be A explained with reference to FIGS. 7 to  10 . First, in FIG. 7A, a resist,  39  such as a photosensitive dry film or a liquid resist material, is coated on the major surface  38   a  of the metal member  38  of, for example stainless steel, approximately 0.1 mm thick. Then, pattern light exposure is effected, using a mask patterned in meeting with the ink pressurizing chamber  31   c  and the connection hole  31   g , and a resist such as a photosensitive dry film or a liquid resist material is coated on the opposite major surface  38   b  of the metal member  38 . Then, pattern light exposure is carried out using a mask patterned in meeting with the ink inlet duct  31   e , ink flow duct  31   d  and the ink buffer tank  31   f.    
     Then, as shown in FIG. 7B, the metal member  38  is etched by immersion for a pre-set time in an etching solution composed of an aqueous solution of ferric chloride, using, as a mask, a resist  39  patterned in meeting with the ink pressurizing chamber  31   c  and the connection hole  31   g  and a resist  40  patterned in meeting with the ink inlet duct  31   e , ink flow duct  31   d  and the ink buffer tank  31   f , for forming the ink pressurizing chamber  31   c  and the connection hole  31   g  on the major surface  38   a  of the metal member  38 , while forming the ink inlet duct  31   e , ink flow duct  31   d  and the ink buffer tank  31   f  on the opposite side major surface of the metal member  38 . This completes the above-mentioned ink pressurizing chamber forming member  31 . 
     The amounts of etching from the major surface  38   a  and the opposite side major surface  38   b  of the metal member  38  are set so as to be slightly larger than approximately one-half the thickness of the metal member  38 . Since the thickness of the metal member  38  in the present embodiment is set to approximately 0.1 mm, the etching amount from each side of the metal member  38  is set to approximately 0.055 mm. By setting the etching amount in this manner, the ink pressurizing chamber  31   c , ink inlet duct  31   e , ink flow duct  31   d  and the ink buffer tank  31   f  is improved in dimensional accuracy and may be formed in stability. 
     Moreover, the etching amount from the major surface  38   a  of the metal member  38  is the same as that of from the opposite side major surface  38   b , the etching condition used at the time of forming the ink pressurizing chamber  31   c  and the connection hole  31   g  on the major surface  38   a  of the metal member  38  may be substantially equated to that used for forming the ink inlet duct  31   e , ink flow duct  31   d  and the ink buffer tank  31   f  on the opposite side major surface  38   b  of the metal member  38 , thus enabling the etching process to be completed easily in a shorter time. 
     It is noted that the width of the ink inlet duct  31   e  is set so as to be larger than the diameter than the diameter of the ink emission hole  33   a , so that pressure rise in the ink pressurizing chamber  31   c  is not affected by pressure applied across the ink pressurizing chamber  31   c . Moreover, the width of the ink inlet duct  31   e  is set so as to be approximately equal to the width at the forming position of the ink inlet duct  31   e  of the ink pressurizing chamber  31   c  but smaller than the main width of the ink pressurizing chamber  31   c . The width of the ink inlet duct  31   e  is preferably not larger than 2.5 times the plate thickness. The width of the ink inlet duct  31   e  approximately equal to the plate thickness tends to produce shape errors during the fabrication process. In the present embodiment, the width of the ink inlet duct  31   e  is of the order of 0.2 mm which is approximately twice the plate thickness. 
     Then, the resists  39 ,  40  are removed, as shown in FIG.  7 C. If, in this case, dry resist films are used as the resists  39 ,  40 , an aqueous solution of sodium hydroxide with a concentration of not higher than 5% of sodium hydroxide is used as a removing agent. If liquid resist films are used as the resists  39 ,  40 , a dedicated alkaline solution is used as a remover. After removing the resists  39 ,  40 , a resin material  41  of, for example Neoflex (manufactured by MITSUI TOATSU KAGAKU KOGYO KK) having a thickness of approximately 50 μm and a glass transition temperature of not higher than 250° C. is bonded by thermal pressure bonding to the opposite side major surface  31   b  of the ink pressurizing chamber forming member  31 . This thermal pressure bonding is effected by applying a pressure of the order of 20 to 30 kgf/cm 2  at a press-working temperature of 230° C. By setting the condition for thermal pressure bonding in this manner, the bonding strength between the ink pressurizing chamber forming member  31  and the resin material  41  can be increased, while these can be bonded together efficiently. 
     Also, since the ink emission hole  33   a  is not formed in this case in the resin material  41 , the bonding step in the process of bonding the resin material  41  to the ink pressurizing chamber forming member  31  can be performed easily to the extent that highly accurate position matching is not required. Moreover, since the resin material  41  is bonded to the ink pressurizing chamber forming member  31  without using an adhesive, there is raised no problem of the adhesive stopping up the ink flow duct  31   d.    
     The liquid repellant film  42  is then formed on the surface of the resin material  41  facing away from the ink pressurizing chamber forming member  31 . The liquid repellant film  42  is preferably formed of a material which repels the ink and which produces no ink remaining affixed in the vicinity of the ink emission hole while producing no burrs without causing ink film delamination in case the ink emission hole  33   a  is formed by excimer laser. Such material may be typified by the fluorine resin dispersed in a polyimide material (such as modified EEP material sold under the trade name of 958-207 by DUPONT; a polyimide based material having a hygroscopicity of 0.4% or less, such as polyimide based overcoat ink sold under the trade name of EPICOAT FS-100L and FP-100 by UBE KOSAN; and liquid-repellant polybenzoimidazole, such as coating type polybenzoimidazole material sold under the trade name of NPBI by HOECHIST AG. 
     The resin material  41  is then irradiated perpendicularly with an excimer laser beam, from the side of the major surface  31   a  of the ink pressurizing chamber forming member  31 , via the ink pressurizing chamber  31   c  and the ink inlet duct  31   e , for forming the ink emission hole  33   a  in the resin material  41  and in the liquid repellant film  42 , as shown in FIG.  7 E. This gives the above-mentioned orifice plate  33 . Since the orifice plate  33  is formed of the resin material  41 , the ink emission hole  33   a  can be formed easily. The liquid repellant film  42  is formed of a material having excellent excimer laser working characteristics, the ink emission hole  33   a  can be formed easily. Moreover, since the ink inlet duct  31   e  is larger in diameter than the ink emission hole  33   a , position matching between the resin material  41  and the ink pressurizing chamber forming member  31  during laser working need not be strict, while it becomes possible to evade the risk of the light beam being shielded during laser working by the ink pressurizing chamber forming member  31 . 
     Then, a piezoelectric material  43  is bonded to the major surface of the second vibrating plate  32   y  of the double-layered vibrating plate  32  to a thickness of approximately 30 μm via an electrically conductive adhesive  34 , as shown in FIG.  8 A. In this case, a pressure of the order of 20 to 30 kgf/cm 2  is preferably used for bonding in order to reduce the thickness of the electrically conductive adhesive to as small a value as possible. This stabilizes the electrical resistance of the junction portion between the piezoelectric material  43  and the vibrating plate  32  while assuring stable adhesion in view of strength. 
     On both sides of the piezoelectric material  43  is formed an electrically conductive film of, for example copper-nickel alloys, approximately 0.2 μm thick, for assuring electrical connection, by a thin-film forming method, such as sputtering. As the electrically conductive adhesive  34 , an epoxy-based adhesive cured at room temperature, admixed with electrically conductive materials, such as carbon particles, for example, is used. 
     A resist material  201 , shaped similarly to the ink pressurizing chamber  31   c , is formed on the piezoelectric material  43 , as shown in FIG.  8 B. As this resist material  201 , a resist for sandblasting, such as BF-405 or BF-403 (trade names) sold by TOKYO OKA or a powder beam etching resist may be used. By using these resist materials, the resolution of the order of 50 μm in terms of the minimum line width may be realized. 
     Then, using a sand-blasting device or a powder beam etching device, a solid-gaseous two-phase jet stream containing diamond particles 5 to 30 μm in size is sprayed onto the piezoelectric material  43  carrying the resist material  201  for processing the piezoelectric material  43  to a shape corresponding to that of the resist material  201  to produce a piezoelectric device  35 , as shown in FIG.  8 C. By using fine diamond particles of the order of 5 to 30 μm, a value of 8 to 9 can be realized as the value of processing speed ratio of the piezoelectric material  43  which later becomes the piezoelectric device  35  to the copper material making up the second vibrating plate  32   y . That is, the processing speed for the piezoelectric material is 8 to 9 times faster than that for the copper material. The result is that, in the processing process of the piezoelectric device  35  shown in FIG. 8C, the processing area can be limited to the copper material making up the second vibrating plate  32   y.    
     The vibrating plate  32 , carrying the piezoelectric device  35 , is immersed in a ferric chloride solution, or a shower of the ferric chloride solution is sprayed onto the vibrating plate  32  carrying the piezoelectric device  35 , for removing the portion of the second vibrating plate  32   y  not carrying the piezoelectric device  35 . Since the first vibrating plate  32   x  is formed of a polyimide or titanium material, and hence is not attacked during the removal process by the aqueous solution of ferric chloride as the etching solution for the second vibrating plate  32   y , only the second vibrating plate  32   y  is removed, as shown in FIG.  8 D. 
     The resist material  201 , left on the piezoelectric device  35 , is then removed, using a dedicated removing solution, as shown in FIG.  8 E. 
     Although the above explanation has been made of removing the second vibrating plate  32   y , using, as a mask, the resist material  201  used for forming the piezoelectric device  35 , it is also possible to remove the resist  201  before the step of removing the second vibrating plate  32   y , as shown in FIG. 9A, and to remove the second vibrating plate subsequently, using the piezoelectric device  35  as a mask, as shown in FIG.  9 B. 
     If the second vibrating plate  32   y  is removed using the resist material  201  as a mask, the electrode material formed on each side of the piezoelectric device  35  can be protected more reliably, whereas, if the second vibrating plate  32   y  is removed after removal of the resist material  201 , using the piezoelectric device  35  as a mask, the etching can be improved in precision because the aqueous solution of ferric chloride as the etching solution for the second vibrating plate  32   y  can penetrate into the inside of a narrow groove more promptly. 
     Although the foregoing description has been made of using the double layer structure for the vibrating plate  32  comprised of the first and second vibrating plates  32   x  and  32   y  and removing the second vibrating plate  32   y , at least one layer towards the piezoelectric device  35  is etched off if the vibrating plate  32  is the multi-layered structure composed of three or more layers. 
     Next, the ink pressurizing chamber forming member  31  carrying the orifice plate  33  is bonded to the vibrating plate  32  carrying the piezoelectric device  35 , as shown in FIG.  10 A. An epoxy-based adhesive may be used as an adhesive. If the polyimide material of Neoflex is used as the material for the first vibrating plate  32   x , bonding may be achieved, without using the adhesive, by using a hot-press working process at a temperature of 220 to 230° C. under a pressure of 20 to 30 kgf/cm 2 , by exploiting the adhesive properties of the polyimide material, thereby improving resistance against chemicals. 
     If a titanium material is used for the first vibrating plate  32   x , which is used as an actuator for the printer, its resonance frequency can be raised for increasing the ink emission speed. 
     As shown in FIG. 10B, on ink supply duct  36  is then bonded to the site of the through-hole  32   b  of the vibrating plate  32 , using, for example, an epoxy-based adhesive. This completes an ink jet printer head  7 . 
     The above-described manufacture of the ink jet printer head  7  makes it possible to form the piezoelectric device  35  to an optional shape inclusive of a linear shape, in contradistinction from the conventional practice in which the shape of the piezoelectric device  35  is necessarily linear. The separation between neighboring piezoelectric devices  35  can be set easily to 100 μm or less. This renders it possible to reduce the nozzle pitch in the printer device. 
     Moreover, in the conventional manufacturing method, abrasion to the tool needs to be taken into account in designing. In the manufacturing method of the present embodiment, there is no necessity of taking the abrasion of the blade into account, thus realizing a designing which places more emphasis on the ink emission performance. 
     Also, in the manufacturing method of the printer device of the present embodiment, substantially the entire surface of the piezoelectric material  43  bonded to the vibrating plate  32  can be split simultaneously, thus significantly reducing the processing time. 
     Second Embodiment 
     In the present embodiment, the present invention is applied to a serial type ‘carrier jet’ printer. 
     A serial type ‘carrier jet’ printer  50  (abbreviated to printer device  50 ) includes a cylindrically-shaped drum  51 , and a paper sheet pressing controller  52  provided at a pre-set position on the outer peripheral surface thereof parallel to the drum  51 . With the present printer device  50 , a printing paper sheet  53 , as a printing support, is sandwiched between the drum  51  and the paper sheet pressing controller  52  for pressing the printing paper sheet  53  in position against the drum  51 . 
     At a small separation from the outer periphery of the drum  51  of the printer device is mounted a feed screw  54  parallel to the drum  51 , On this feed screw  54  is mounted a ‘carrier jet’ printer head  56  via a supporting member  55  meshing with the feed screw  54 . By rotating the feed screw  54 , this ‘carrier jet’ printer head  56  is adapted for being moved along with the supporting member  55  meshing with the feed screw  54  axially of the drum  51  as shown by arrow A in FIG.  11 . 
     The drum  51  is coordinated to a motor  60  via a first pulley  57 , a belt  58  and a second pulley  59 , and hence is rotated in a direction indicated by arrow B in FIG. 11 with rotation of the motor  60 . 
     The printer device  50  is controlled by a controller  61 , as shown in FIG.  12 . In the controller, the signal processing control circuit  21 , memory  23 , driving controller  24  and the correction circuit  25  are the same as the signal processing control circuit  21 , memory  23 , driving controller  24  and the correction circuit  25  and hence are not explained in detail. 
     The controller  61  of the printer device  50  of the present embodiment includes a first driver  62  for emitting the ink and a second driver  63  for emitting the dilution liquid. In actuality, plural first drivers  62  corresponding to the number of the ink emission holes and plural second drivers  63  corresponding to the number of the dilution liquid emission holes are provided, respectively. The first driver  62  and the second driver  63  are used for driving controlling the first piezoelectric device (quantitation side) provided for emitting the ink via the ink emission holes and for driving controlling the second piezoelectric device (emission side) provided for emitting the dilution liquid via the dilution liquid emission holes, respectively. 
     The first and second drivers  62 ,  63  driving-control the associated first and second piezoelectric devices, respectively, under control by a serial/parallel conversion circuit  64  and a timing control circuit  65 , provided in the signal processing control circuit  21 , as shown in FIG.  13 . 
     Specifically, the serial/parallel conversion circuit  64  sends digital half-tone data D 1  to the first driver  62  and to the second driver  63 . 
     On reception of a letter-printing trigger signal T 1 , the timing control circuit  65  sends out timing signals to the first and second drivers  62 ,  63  at pre-set timing. This letter-printing trigger signal T 1  is sent at a letter printing timing to the timing control circuit  65 . 
     The first and second drivers  62 ,  63  send to associated first and second piezoelectric devices driving signals (driving voltage signals) corresponding to the timing signals from the timing control circuit  65 . The timing control circuit  65  sends the timing signals to the first and second drivers  62 ,  63  so that the driving voltage signals applied to the first and second piezoelectric devices will be of the timing as shown for example in FIG.  14 . It is noted that the first and second piezoelectric devices are associated with paired ink emission holes and dilution liquid emission holes, respectively. 
     In the present embodiment, the emission period is 1 msec (frequency of 1 kHz). The ink quantitation and mixing and emission of liquid droplets take place during this time period. There takes place no ink quantisation and mixing if the digital half-tone data D 1  from the serial/parallel conversion circuit  64  is lower than a pre-set threshold value. 
     The ‘carrier jet’ printer head  56  is hereinafter explained. 
     Referring to FIG. 15, the ‘carrier jet’ printer head  56  includes a plate-shaped pressurizing chamber forming member  71  on one major surface  71   a  and on the opposite side major surface  71   b  of which a vibrating plate  72  and a plate-shaped orifice plate  73  are bonded, respectively. In the ‘carrier jet’ printer head  56 , a first piezoelectric device  76  (corresponding to the above-mentioned first piezoelectric device) and a second piezoelectric device  77  (corresponding to the above-mentioned second piezoelectric device) are bonded to one  72   a  of the major surfaces of the vibrating plate  72 . There is formed a liquid repellant film  67  around the portions of the orifice plate  73  in which are opened an ink emission hole  73   a  and a dilution liquid emission hole  73   b  as later explained. 
     The pressurizing chamber forming member  71  is formed by a metal plate of stainless steel with a thickness of approximately 0.1 mm. The pressurizing chamber forming member  71  is formed with an ink pressurizing chamber  71   c  for pressurizing the ink charged therein to a pre-set pressure, and an ink flow duct  71   d  communicating with one end of the ink pressurizing chamber  71   c  and adapted for serving as a conduit for supplying the ink to the ink pressurizing chamber  71   c . The pressurizing chamber forming member  71  is also formed with an ink inlet hole  71   e  at the opposite end of the ink pressurizing chamber  71   c  and adapted for serving as a through-hole for conducting the ink charged into the ink pressurizing chamber  71   c  to the ink emission hole  73   a . The pressurizing chamber forming member  71  is also formed with an ink buffer tank  71   f  for supplying the ink to the ink flow duct  71   d , and a first connection hole  71   g  for sending the ink supplied from an ink supply duct  78  into the ink buffer tank  71   f . The pressurizing chamber forming member  71  is also formed with a dilution liquid pressurizing chamber  71   h  for pressurizing the dilution liquid charged therein to a pre-set pressure, and a dilution liquid flow duct  71   i  communicating with one end of the dilution liquid pressurizing chamber  71   h  and adapted for serving as a conduit for supplying the dilution liquid to the dilution liquid pressurizing chamber  71   h . The pressurizing chamber forming member  71  is also formed with a dilution liquid inlet hole  71   j  at the opposite end of the dilution liquid pressurizing chamber  71   h  and adapted for serving as a through-hole for conducting the dilution liquid charged into the dilution liquid pressurizing chamber  71   h  to the dilution liquid emission hole  73   b . The pressurizing chamber forming member  71  is also formed with a dilution liquid buffer tank  71   k  for supplying the dilution liquid to the dilution liquid flow duct  71   i , and a first connection hole  71   l  for sending the dilution liquid supplied from an dilution liquid supply duct  79  into the dilution liquid buffer tank  71   k.    
     The ink pressurizing chamber  71   c  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  to the major surface  71   a  of the pressurizing chamber forming member  71 . The ink inlet duct  71   e  is formed at the opposite end of the ink pressurizing chamber  71   c  for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  to the opposite major surface  71   b  of the pressurizing chamber forming member  71 . 
     Similarly to the ink inlet hole  71   e , the ink flow duct  71   d  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  to the opposite major surface  71   b  of the pressurizing chamber forming member  71 . The ink flow duct  71   d  is separated by a first member  71   m  from the ink inlet hole  71   e . The ink flow duct  71   d  is formed so that a portion thereof on the side of the first member  71   m  communicates with an end of the ink pressurizing chamber  71   c.    
     Similarly to the ink inlet hole  71   e  and the ink flow duct  71   d , the ink buffer tank  71   f  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  to the opposite major surface  71   b  of the pressurizing chamber forming member  71 . The ink buffer tank  71   f  is a linear sole piping communicating with plural ink flow ducts  71   d  and has the function of supplying the ink to the ink flow ducts  71   d , as shown in FIG.  16 . 
     The first connection hole  71   g  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  to the major surface  71   a  thereof for communicating with the ink buffer tank  71   f.    
     The pressurizing chamber forming member  71  includes a first member  71   m , a second member  71   n  and a third member  71   o . The first member  71   m  forms the bottom surface of the ink pressurizing chamber  71   c  and a portion of the opposite side major surface  71   b  of the pressurizing chamber forming member  71  and is contacted with a lateral surface of the ink inlet hole  71   e  and a lateral surface of the ink flow duct  71   d  for separating the ink inlet hole  71   e  from the ink flow duct  71   d . The second member  71   n  forms the top surface of the ink flow duct  71   d  and a portion of the major surface  71   a  of the pressurizing chamber forming member  71  and is contacted with a lateral surface of the ink pressurizing chamber  71   c  and a lateral surface of the first connection hole  71   g  for separating the ink pressurizing chamber  71   c  from the first connection hole  71   g . The third member  71   o  is contacted with the lateral surface of the ink buffer tank  71   f  and the opposite lateral surface of the first connection hole  71   g  and constitutes the major surface  71   a  and a portion of the opposite side major surface  71   b  of the pressurizing chamber forming member  71 . The voids delimited by the first to third members  71   m ,  71   n  and  71   o  and a seventh member  71   s  as later explained correspond to the ink pressurizing chamber  71   c , ink inlet hole  71   e , ink flow duct  71   d , ink buffer tank  71   f  and the first connection hole  71   g , respectively. 
     The dilution liquid pressurizing chamber  71   h  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  towards the major surface  71   a  thereof. The dilution liquid flow duct  71   j  is formed at the opposite end of the dilution liquid pressurizing chamber  71   h  and is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  towards the opposite side major surface  71   b  thereof. 
     Similarly to the dilution liquid inlet duct  71   j , the dilution liquid flow duct  71   i  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  towards the opposite side major surface  71   b  thereof. The dilution liquid flow duct  71   i  is separated from the dilution liquid inlet duct  71   j  by a fourth member  71   p  which will be explained subsequently. The dilution liquid flow duct  71   i  is formed so that part thereof towards the fourth member  71   p  communicates with one end of the dilution liquid pressurizing chamber  71   h.    
     Similarly to the dilution liquid inlet duct  71   j  and the dilution liquid flow duct  71   i , a dilution liquid buffer tank  71   k  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  towards the opposite side major surface  71   b  thereof. Similarly to the ink buffer tank  71   f , the dilution liquid buffer tank  71   k  is a sole linear piping communicating with plural dilution liquid flow ducts  71   i , as shown in FIG. 16, and performs the function of supplying the ink to the dilution liquid flow ducts  71   i.    
     A second connection hole  71   l  is formed for extending from a mid portion along the thickness of the pressurizing chamber forming member  71  towards the major surface  71   a  of the pressurizing chamber forming member  71 . 
     The pressurizing chamber forming member  71  is formed with a fourth member  71   p , a fifth member  71   q  and a sixth member  71   r . The fourth member  71   p  forms the bottom surface of the dilution liquid pressurizing chamber  71   h  and a portion of the opposite side major surface  71   b  of the pressurizing chamber forming member  71  and is contacted with a lateral surface of the dilution liquid inlet hole  71   j  and a lateral surface of the dilution liquid flow duct  71   i  for separating the dilution liquid inlet hole  71   j  from the dilution liquid flow duct  71   i . The fifth member  71   q  forms the top surface of the dilution liquid flow duct  71   i  and a portion of the major surface  71   a  of the pressurizing chamber forming member  71  and is contacted with a lateral surface of the dilution liquid pressurizing chamber  71   h  and a lateral surface of the second connection hole  71   l  for separating the dilution liquid pressurizing chamber  71   h  from the second connection hole  71   g . The third member  71   r  is contacted with the lateral surface of the dilution liquid buffer tank  71   k  and with the opposite lateral surface of the second connection hole  71   l  and constitutes the major surface  71   a  and a portion of the opposite side major surface  71   b  of the pressurizing chamber forming member  71 . 
     The pressurizing chamber forming member  71  is also formed with a seventh member  71   s  surrounded by the opposite lateral surface of the ink pressurizing chamber  71   c , opposite lateral surface of the ink inlet hole  71   e , opposite lateral surface of the dilution liquid pressurizing chamber  71   h  and by the opposite lateral surface of the dilution liquid inlet duct  71   j  for forming one major surface  71   a  and a portion of the opposite side major surface  71   b  of the pressurizing chamber forming member  71 . 
     The voids delimited by the fourth to seventh members  71   p ,  71   q ,  71   r  and  71   s  correspond to the dilution liquid pressurizing chamber  71   h , dilution liquid inlet hole  71   i , dilution liquid flow duct  71   j , dilution liquid buffer tank  71   k  and the first connection hole  71   l , respectively. 
     On the opposite side major surface  71   b  of the pressurizing chamber forming member  71  is bonded, by thermal pressure bonding, the ink inlet hole  71   e , ink flow duct  71   d , ink buffer tank  71   f , dilution liquid inlet duct  71   j , dilution liquid flow duct  71   i  and the dilution liquid buffer tank  71   k . This orifice plate  73  is formed of, for example, Neoflex (manufactured by MITSUI TOATSU KAGAKU KOGYO KK) having a thickness of approximately 50 μm and a glass transition temperature of not higher than 250° C. 
     In this orifice plate  73  is obliquely formed the ink emission hole  73   a  of a pre-set diameter so as to be directed to a dilution liquid emission hole  73   b  as later explained. The ink emission hole  73   a  communicates with the ink inlet hole  71   e  and is adapted for emitting the ink supplied from the ink pressurizing chamber  71   c  via the ink inlet hole  71   e . In the orifice plate  73  is also formed a dilution liquid emission hole  73   b  of a columnar cross-section of a pre-set diameter. The dilution liquid emission hole  73   b  communicates with the dilution liquid inlet duct  71   j  and is adapted for emitting the dilution liquid supplied from the dilution liquid pressurizing chamber  71   h  via the dilution liquid inlet duct  71   j . By having the orifice plate  73  formed with the ink emission hole  73   a  and with the dilution liquid emission hole  73   b  in this manner, chemical stability can be assured for the ink and the dilution liquid. 
     The above-mentioned first and second piezoelectric devices  76 ,  77  are shaped similarly to the ink pressurizing chamber  71   c  and the dilution liquid pressurizing chamber  71   h , as shown in FIG.  16 . The separation between the neighboring first and second piezoelectric devices  76 ,  77  is set to not larger than 100 μm. 
     The ink pressurizing chamber  71   c  is designed so that the width C 4  at the site of the ink inlet hole  71   e  is smaller than the main width C 3  of the ink pressurizing chamber  71   c  and larger than the opening diameter A 2  towards the ink inlet hole  71   e  of the ink emission hole  73   a . Specifically, with the main width C 3  of the ink pressurizing chamber  71   c  of 0.4 to 0.6 mm, the width C 4  at the site of the ink inlet hole  71   e  of the ink pressurizing chamber  71   c  is of the order of 0.2 mm which is approximately twice the plate thickness of the pressurizing chamber forming member  71 . 
     On the other hand, the width H 2  at the site of the dilution liquid inlet duct  71   j  of the dilution liquid pressurizing chamber  71   h  is set so as to be smaller than the main width H 1  of the dilution liquid pressurizing chamber  71  and larger than the opening diameter B 1  towards the dilution liquid inlet duct  71   j  of the dilution liquid emission hole  73   b . Specifically, with the main width H 1  of the dilution liquid pressurizing chamber  71   h  of 0.4 to 0.6 mm, the width H 2  at the site of the dilution liquid inlet hole  71   j  of the dilution liquid pressurizing chamber  71   h  is of the order of 0.2 mm which is approximately twice the plate thickness of the pressurizing chamber forming member  71 . 
     The width C 4  at the site of the ink inlet hole  71   e  of the ink pressurizing chamber  71   c  and the width H 2  at the site of the dilution liquid inlet hole  71   j  of the dilution liquid pressurizing chamber  71   h  are preferably set so as to be not larger than 2.5 times the thickness of the pressurizing chamber forming member  71 . 
     In the present embodiment, the dilution liquid emission hole  73   b  is formed such as to communicate with the mid portion of the dilution liquid inlet duct  71   j . Similarly to the ink emission hole  33   a  of the first embodiment, the dilution liquid emission hole  73   b  is tapered along the direction of emission of the dilution liquid. The cross-sectional shape at an opening area of the dilution liquid emission hole  73   b  is circular with a diameter of approximately 35 μm, while its cross-sectional shape towards the pressurizing chamber forming member  71  is circular with a diameter of approximately 80 μm. Thus, the width H 2  at the site of the dilution liquid inlet hole  71   j  of the dilution liquid pressurizing chamber  71   h  is smaller than the main width H 1  of the dilution liquid pressurizing chamber  71   h  but larger than the opening diameter B 1  of the dilution liquid emission hole  73   b  towards the dilution liquid inlet duct  71   j.    
     Moreover, since the ink emission hole  73   a  is formed obliquely, it is of an elliptical cross-section. In the present embodiment, the cross-sectional shape of the ink emission hole  73   a  towards the pressurizing chamber forming member  71  is of a diameter along the short axis of approximately 80 μm. Therefore, the width C 4  at the site of the ink inlet hole  71   e  of the ink pressurizing chamber  71   c  is smaller than the main width C 3  of the ink pressurizing chamber  71   c  but larger than the opening diameter A 2  towards the ink inlet hole  71   e  of the ink emission hole  73   a.    
     On the major surface  71   a  of the pressurizing chamber forming member  71  is bonded, by an adhesive, a double-layered vibrating plate  72  for closing the ink pressurizing chamber  71   c  and the opening of the dilution liquid pressurizing chamber  71   h . The opening of the ink pressurizing chamber  71   c  and that of the dilution liquid pressurizing chamber  71   h  mean the opening portions of the ink pressurizing chamber  71   c  and the dilution liquid pressurizing chamber  71   h  in the major surface  71   a  of the pressurizing chamber forming member  71 . 
     The vibrating plate  72  is of a double-layered structure formed by a first vibrating plate  72   x  and a second vibrating plate  72   y . The first vibrating plate  72   x  is positioned towards the ink pressurizing chamber  71   c  and a dilution liquid pressurizing chamber  71   h  and is adapted for closing all openings of the ink pressurizing chamber  71   c  and the dilution liquid pressurizing chamber  71   h , whilst the second vibrating plate  72   y  is shaped similarly to a piezoelectric device  75  formed on the vibrating plate  72 . 
     In this vibrating plate  72  are formed a first through-hole  72   b  and a second through-hole  72   c  in register with the first connection hole  71   g  and a second connection hole  71   l , respectively. In these first and second through-holes  72   b ,  72   c  are mounted an ink supply duct  78  and a dilution liquid supply duct  79 , respectively, connected to an ink tank and a dilution liquid tank, not shown, respectively. Thus, the ink supplied from the ink tank is supplied via ink supply duct  78  and ink buffer tank  71   f  to an ink flow duct  71   d  and thence to the ink pressurizing chamber  71   c . The dilution liquid supplied form the dilution liquid tank is supplied via a dilution liquid supply duct  79  and a dilution liquid buffer tank  71   k  to a dilution liquid flow duct  71   i  so as to be charged into the dilution liquid pressurizing chamber  71   h.    
     For the first vibrating plate  72   x  of the double-layered vibrating plate  72 , Neoflex (manufactured by MITSUI TOATSU KAGAKU KOGYO KK) having a thickness of approximately 50 μm and a glass transition temperature of not higher than 250° C. is used, as in the case of the orifice plate  73 . As the first vibrating plate  72   x  of the double-layered vibrating plate  72 , a copper plate approximately 15 μm thick, for example, is used. 
     On the major surface of the second vibrating plate  72   y  are bonded a first piezoelectric device  76  and a second piezoelectric device  77  via an electrically conductive adhesive  74 . Although the vibrating plate  72  of the present embodiment is a double-layered structure comprised of the first and second vibrating plates  72   x ,  72   y , the vibrating plate  72  may also be formed as a sole-layer structure or a multi-layered structure of three or more layers. 
     If a driving voltage is applied across the first piezoelectric device  76  in a state shown in FIG. 17A, the first piezoelectric device  76  is displaced in a direction indicated by arrow A in FIG. 17B for warping the vibrating plate  72  to decrease the volume of the ink pressurizing chamber  71   c  to raise the pressure therein. 
     If a driving voltage is applied across the second piezoelectric device  77  in a state shown in FIG. 17B, the second piezoelectric device  77  is displaced in a direction indicated by arrow B in FIG. 17C for warping the vibrating plate  72  to decrease the volume of the dilution liquid pressurizing chamber  71   h  to raise the pressure therein. 
     The operation of the ‘carrier jet’ printer head  56  is now explained. 
     In the stand-by state, the ink and the dilution liquid, charged into the ink pressurizing chamber  71   c  and in the dilution liquid pressurizing chamber  71   h , respectively, produce meniscuses in a stabilized state in the vicinity of the ink emission hole  73   a  and the dilution liquid emission hole  73   b , by equilibrium with surface tension, as shown in FIG.  17 A. 
     During ink quantitation, a driving voltage is applied across the first piezoelectric device  76  for displacing the first piezoelectric device in a direction indicated by arrow A in FIG.  17 B. With this displacement of the first piezoelectric device  76 , the vibrating plate  72  is displaced in a direction indicated by arrow A in FIG.  17 B. By this displacement of the vibrating plate  72 , the ink pressurizing chamber  71   c  is decreased in pressure so that the pressure therein is increased. 
     Since time changes of the driving voltage applied across the first piezoelectric device  76  are moderately set to prevent the ink from flying from the ink emission hole  73   a , the ink is simply extruded without flying from the ink emission hole  73   a . Since the driving voltage applied across the first piezoelectric device  76  is set to a value in meeting with the gradation of the picture data, the amount of the ink emitted from the distal end of the ink emission hole  73   a  corresponds to picture data. The ink extruded from the ink emission hole  73   a  is contacted and mixed with the dilution liquid forming the meniscus in the vicinity of the distal end of the dilution liquid emission hole  73   b.    
     During ink emission, a driving voltage is applied across the second piezoelectric device  77  for displacing the first piezoelectric device in a direction indicated by arrow B in FIG.  17 C. With this displacement of the first piezoelectric device  76 , the vibrating plate  72  is displaced in a direction indicated by arrow B in FIG.  17 C. By this displacement of the vibrating plate  72 , the dilution liquid pressurizing chamber  71   h  is decreased in pressure so that the pressure therein is increased. This emits the mixed solution having an ink concentration in meeting with the picture data from the dilution liquid emission hole  73   b . It is noted that time changes of the driving voltage applied across the second piezoelectric device  77  are set to permit the mixed solution to be emitted via the dilution liquid emission hole  73   b.    
     Referring to FIGS. 18 to  21 , the manufacturing method for the ‘carrier jet’ printer head  56  is hereinafter explained. 
     Referring first to FIG. 18A, a resist  83  of, for example, a photosensitive dry film or a liquid resist, is coated on one of the major surfaces  82   a  of a metal member  82  of, for example, stainless steel, approximately 0.1 mm thick. Then, pattern light exposure is carried out using a mask having a pattern corresponding to the ink pressurizing chamber  71   c , first connection hole  71   g , dilution liquid pressurizing chamber  71   h  and to the second connection hole  71   l , at the same time as a resist  84  such as a photosensitive dry film or a liquid resist material, is coated on the opposite side major surface  82   b  of the metal member  82 . Then, pattern light exposure is carried out using a mask having a pattern corresponding to the ink inlet hole  71   e , ink buffer tank  71   f , dilution liquid inlet duct  71   j , dilution liquid flow duct  71   i  and the dilution liquid buffer tank  71   k.    
     Then, as shown in FIG. 18B, the metal member  82  is etched by dipping for a pre-set time in an etching solution composed of, for example, an aqueous solution of ferric chloride, using, as masks, a resist  83  patterned in meeting with the ink pressurizing chamber  71   c , first connection hole  71   g , dilution liquid pressurizing chamber  71   h  and the second connection hole  71   l , and a resist  84  patterned in meeting with the ink inlet hole  71   e , ink flow duct  71   d , ink buffer tank  71   f , dilution liquid inlet duct  71   j , dilution liquid flow duct  71   i  and to the dilution liquid buffer tank  71   k , for forming the ink pressurizing chamber  71   c , first connection hole  71   g , dilution liquid pressurizing chamber  71   h  and the second connection hole  71   l  on the major surface  82   a  of the metal member  82 . On the opposite side major surface  82  are formed the ink inlet hole  71   e , ink flow duct  71   d , ink buffer tank  71   f , dilution liquid inlet duct  71   j , dilution liquid flow duct  71   i  and the dilution liquid buffer tank  71   k . This completes the above-mentioned pressurizing chamber forming member  71 . 
     The amounts of etching from the major surface  82   a  and the opposite side major surface  82   b  of the metal member  82  are both set so as to be slightly larger than approximately one-half the thickness of the metal member  82 . Since the thickness of the metal member  82  is set in the present embodiment to 0.1 mm, the etching amount from a side of the metal member  82  is set to approximately 0.0055 mm. By setting the etching amount to this value, the ink pressurizing chamber  71   c , first connection hole  71   g , ink inlet hole  71   e , ink flow duct  71   d , ink buffer tank  71   f , dilution liquid pressurizing chamber  71   h , second connection hole  71   l , dilution liquid inlet duct  71   j , dilution liquid flow duct  71   i  and the dilution liquid buffer tank  71   k  can be improved in dimensional accuracy and can be manufactured in stability. 
     Moreover, the etching amount from the major surface  82   a  of the metal member  82  is the same as that from the opposite side major surface  82   b , the etching condition used for forming the ink pressurizing chamber  71   c , the connection hole  71   g , dilution liquid pressurizing chamber  71   h  and the second connection hole  71   l  on the major surface  82   a  of the metal member  82  may be substantially equated to that used for forming the ink inlet duct  71   e , ink flow duct  71   d , ink buffer tank  71   f , dilution liquid inlet duct  71   j , dilution liquid flow duct  71   i  and the dilution liquid buffer tank  71   k  on the opposite side major surface  82   b  of the metal member  82 , thus enabling the etching process to be completed easily in a shorter time. 
     It is noted that the widths of the ink inlet duct  71   e  and the dilution liquid inlet duct  71   j  are set so as to be larger than the diameter of the ink emission hole  73   a  and the dilution liquid emission hole  73   b  so that pressure rise in the ink pressurizing chamber  71   c  and in the dilution liquid pressurizing chamber  71   h  is not affected by pressure applied across the ink pressurizing chamber  71   c  and the dilution liquid pressurizing chamber  71   h.    
     Moreover, the width of the ink inlet duct  71   e  is set so as to be approximately equal to the width at the forming position of the ink inlet duct  71   e  of the ink pressurizing chamber  71   c  but smaller than the main width of the ink pressurizing chamber  71   c , while the width of the dilution liquid inlet duct  71   j  is set so as to be approximately equal to the width at the forming position of the dilution liquid inlet duct  71   j  of the dilution liquid pressurizing chamber  71   h  but smaller than the main width of the dilution liquid pressurizing chamber  71   h . The widths of the ink inlet duct  71   e  and the dilution liquid inlet duct  71   j  are preferably not larger than 2.5 times the plate thickness. 
     If the widths of the ink inlet hole  71   e  and the dilution liquid inlet duct  71   j  are of the same order as the plate thickness, shape errors tend to be produced during manufacturing processes. Therefore, the widths are preferably not less than the plate thickness from the viewpoint of the manufacturing processes. In the present embodiment, the widths of the ink inlet hole  71   e  and the dilution liquid inlet duct  71   j  are of the order of 0.2 mm which is approximately twice the plate thickness. 
     Then, the resists  83 ,  84  are removed, as shown in FIG.  18 C. If, in this case, dry resist films are used as the resists  83 ,  84 , an aqueous solution of sodium hydroxide with a concentration of not higher than 5% of sodium hydroxide is used as a removing agent. If liquid resist films are used as the resists  83 ,  84 , a dedicated alkaline solution is used as a remover. After removing the resists  83 ,  84 , a resin material  85  of, for example Neoflex (manufactured by MITSUI TOATSU KAGAKU KOGYO KK) having a thickness of approximately 50 μm and a glass transition temperature of not higher than 250° C. is bonded by thermal pressure bonding to the opposite side major surface  71   b  of the ink pressurizing chamber forming member  71 . This thermal pressure bonding is effected by applying a pressure of the order of 20 to 30 kgf/cm 2  at a press-working temperature of 230° C. By setting the condition for thermal pressure bonding in this manner, the bonding strength between the ink pressurizing chamber forming member  71  and the resin material  85  can be increased, while these can be bonded together efficiently. 
     Also, since the ink emission hole  73   a  or the dilution liquid emission hole  73   b  is not formed in this case in the resin material  85 , the bonding step in the process of bonding the resin material  85  to the ink pressurizing chamber forming member  71  can be performed easily to the extent that highly accurate position matching is not required. Moreover, since the resin material  85  is bonded to the ink pressurizing chamber forming member  71  without using an adhesive, there is raised no problem of the adhesive stopping up the ink flow duct  71   d  or the dilution liquid flow duct  71   i.    
     The liquid repellant film  67  is then formed on the surface of the resin material  85  facing the ink pressurizing chamber forming member  71 . The liquid repellant film  67  is preferably formed of a material which repels the ink and which produces no ink remaining affixed in the vicinity of the ink emission hole while producing no burrs without causing ink film delamination in case the ink emission hole  33   a  is formed by excimer laser. Such material may be typified by the fluorine resin dispersed in a polyimide material (such as modified EEP material sold under the trade name of 958-207 by DUPONT; a polyimide based material having a hygroscopicity of 0.4% or less, such as polyimide based overcoat ink sold under the trade name of EPICOAT FS-100L and FP-100 by UBE KOSAN; and liquid-repellant polybenzoimidazole, such as coating type polybenzoimidazole material sold under the trade name of NPBI by HOECHIST AG. 
     The resin material  85  is then irradiated perpendicularly with an excimer laser beam, from the side of the major surface  71   a  of the ink pressurizing chamber forming member  71 , via the dilution liquid pressurizing chamber  71   h  and the dilution liquid inlet duct  71   j , for forming the dilution liquid emission hole  73   b  in the resin material  85 , as shown in FIG.  18 E. Also, the resin material  85  is irradiated perpendicularly with an excimer laser beam, from the side of the major surface  71   a  of the ink pressurizing chamber forming member  71 , via the ink pressurizing chamber  71   c  and the ink inlet duct  71   e , for forming the ink emission hole  73   a  in the resin material  85  This gives the above-mentioned orifice plate  33 . 
     Since the orifice plate  33  is formed of the resin material  85 , the ink emission hole  73   a  and the dilution liquid emission hole  73   b  can be formed easily. The liquid repellant film  67  is formed of a material having excellent excimer laser working characteristics, the ink emission hole  73   a  and the dilution liquid emission hole  73   b  can be formed easily. Moreover, since the ink inlet duct  71   e  and the dilution liquid inlet duct  71   j  are larger in diameter than the ink emission hole  73   a  and the dilution liquid emission hole  73   b , position matching between the resin material  85  and the ink pressurizing chamber forming member  71  during laser working need not be strict, while it becomes possible to evade the risk of the light beam being shielded during laser working by the ink pressurizing chamber forming member  71 . 
     Then, a piezoelectric material  75  about 30 μm thick is bonded to the major surface of the second vibrating plate  72   y  of the double-layered vibrating plate  72  via an electrically conductive adhesive  74 , as shown in FIG.  19 A. In this case, a pressure of the order of 20 to 30 kgf/cm 2  is preferably used for bonding in order to reduce the thickness of the electrically conductive adhesive to as small a value as possible. This stabilizes the electrical resistance of the junction portion between the piezoelectric material  75  and the vibrating plate  72  while assuring stable adhesion in view of strength. 
     On both sides of the piezoelectric material  43  is formed an electrically conductive film of, for example copper-nickel alloys, approximately 0.2 μm thick, for assuring electrical connection, by a thin-film forming method, such as sputtering. As the electrically conductive adhesive  74 , an epoxy-based adhesive cured at room temperature, admixed with electrically conductive materials, such as carbon particles, for example, is used. 
     Then, resist materials  202 ,  203 , shaped similarly to the ink pressurizing chamber  71   c  and the dilution liquid pressurizing chamber  71   h , are formed on the piezoelectric material  75 , as shown in FIG.  19 B. As these resist materials  202 ,  203 , a resist for sandblasting, such as BF-405 or BF-403 (trade names) sold by TOKYO OKA, or a powder beam etching resist, may be used. By using these resist materials, the resolution of the order of 50 μm in terms of the minimum line width may be realized. 
     Then, using a sand-blasting device or a powder beam etching device, a solid-gaseous two-phase jet stream containing diamond particles 5 to 30 μm in size is sprayed onto the piezoelectric material  75  carrying the resist materials  202 ,  203  for processing the piezoelectric material  75  to a shape corresponding to that of the resist materials  202 ,  203  to produce first and second piezoelectric device  76 ,  77 , as shown in FIG.  19 C. By using fine diamond particles of the order of 5 to 30 μm, a value of 8 to 9 can be realized as the value of processing speed ratio to the copper material making up the second vibrating plate  32   y  of the piezoelectric materials  76 ,  77  which later become the first and second piezoelectric device  76 ,  77 . That is, the processing speed for the piezoelectric material is 8 to 9 times faster than that for the copper material. The result is that, in the processing process of the piezoelectric devices  76 ,  77  shown in FIG. 19C, the processing area can be limited to the copper material making up the second vibrating plate  72   y.    
     The vibrating plate  72 , carrying the first and second piezoelectric devices  76 ,  77 , is immersed in a ferric chloride solution, or a shower of the ferric chloride solution is sprayed onto the vibrating plate  72  carrying the piezoelectric devices  76 ,  77 , for removing the portion of the second vibrating plate  72   y  not carrying the piezoelectric devices  76 ,  77  Since the first vibrating plate  72   x  is formed of a polyimide or titanium material, and hence is not attacked during the removal process by the aqueous solution of ferric chloride as the etching solution for the second vibrating plate  72   y , only the second vibrating plate  72   y  is removed, as shown in FIG.  19 D. 
     The resist materials  202 ,  203 , left on the piezoelectric devices  76 ,  77 , are then removed, using a dedicated removing solution, as shown in FIG.  19 E. 
     Although the above explanation has been made of removing the second vibrating plate  72   y , using, as a mask, the resist materials  202 ,  203 , used for forming the piezoelectric devices  76 ,  77 , it is also possible to remove the resists  202 ,  203  before the step of removing the second vibrating plate  72   y , as shown in FIG. 20A, and to remove the second vibrating plate subsequently, using the piezoelectric devices  76 ,  77  as a mask, as shown in FIG.  20 B. 
     If the second vibrating plate  72   y  is removed using the resist material  201  as a mask, the electrode material formed on each side of the first and second piezoelectric devices  76 ,  77  can be protected more reliably, whereas, if the second vibrating plate  72   y  is removed after removal of the resist materials  202 ,  203 , using the first and second piezoelectric devices  76 ,  77  as a mask, the etching can be improved in precision because the aqueous solution of ferric chloride as the etching solution for the second vibrating plate  72   y  can penetrate into the inside of a narrow groove more promptly. 
     Although the foregoing description has been made of using the double layer structure for the vibrating plate  32  comprised of the first and second vibrating plates  72   x  and  72   y  and removing the second vibrating plate  72   y , at least one layer towards the first and second piezoelectric devices  76 ,  77  is etched off if the vibrating plate  72  is of the multi-layered structure composed of three or more layers. 
     Next, the ink pressurizing chamber forming member  71  carrying the orifice plate  73  is bonded to the vibrating plate  72  carrying the first and second piezoelectric devices  76 ,  77 , as shown in FIG.  21 A. An epoxy-based adhesive may be used as an adhesive. If the polyimide material of Neoflex is used as the material for the first vibrating plate  72   x , bonding may be achieved, without using the adhesive, by using a hot-press working process at a temperature of 220 to 230° C. under a pressure of 20 to 30 kgf/cm 2 , by exploiting the adhesive properties of the polyimide material, thereby improving resistance against chemicals. 
     If a titanium material is used for the first vibrating plate  72   x , which is used as an actuator for the printer, its resonance frequency can be raised for increasing the ink emission speed. 
     An ink supply duct  78  is then bonded to the site of the through-hole  72   b  of the vibrating plate  72 , using, for example, an epoxy-based adhesive, as shown in FIG.  21 B. This completes the ‘carrier jet’ printer head  56 . 
     The above-described manufacture of the ‘carrier jet’ printer head  56  makes it possible to form the first and second piezoelectric devices  76 ,  77  to an optional shape inclusive of a linear shape, in contradistinction from the conventional practice in which the shape of the piezoelectric device is necessarily linear. The separation between neighboring piezoelectric devices  76 ,  77  can be set easily to 100 μm or less. This renders it possible to reduce the nozzle pitch in the printer device. 
     Moreover, in the conventional manufacturing method, abrasion to the tool needs to be taken into account in designing. In the manufacturing method of the present embodiment, there is no necessity of taking the abrasion of the blade into account, thus realizing a designing which places more emphasis on the ink emission performance. 
     Also, in the manufacturing method of the printer device of the present embodiment, substantially the entire surface of the piezoelectric material  75  bonded to the vibrating plate  72  can be split simultaneously, thus significantly reducing the processing time. 
     Other Embodiment 
     In the above-described first embodiment, the method has been described in which the vibrating plate  32  carrying the piezoelectric device  35  is bonded to the pressurizing chamber forming member  31  carrying the orifice plate  33  to manufacture the ink jet print head  7 . This invention, however, is not limited to this configuration. For example, it is also possible to bond the vibrating plate  32  to the pressurizing chamber forming member  31  carrying the orifice plate  33  and subsequently to form the piezoelectric device  35  on this vibrating plate  32 , as shown in FIG.  22 . 
     That is, a vibrating plate  32  and a piezoelectric material  35  of a dual-layer structure are bonded to the major surface  31   a  of the pressurizing chamber forming member  31  carrying the orifice plate  33 , as shown in FIG.  22 A. 
     Then, a pattern is formed on the resist material  201  on the piezoelectric material  35 , as shown in FIG.  22 B. 
     Then, using this resist material  201  as a mask, a piezoelectric device  35  shaped similarly to the resist material  201  is formed by powder beam etching or sandblasting, at the same time as the second vibrating plate  32   y  is removed by an etching process employing an aqueous solution of ferric chloride. 
     After formation of the piezoelectric device  35  and the second vibrating plate  32   y  to the desired shape, the ink supply duct  36  is bonded at the site of the through-hole  32   b  in the first vibrating plate  32   x.    
     As in the first embodiment, the delamination process for the resist material  201  may be executed before or after the etching process employing an aqueous solution of ferric chloride. The method for bonding the vibrating plate  32  to the pressurizing chamber forming member  31  and the method for bonding the vibrating plate  32  to the piezoelectric device  35  may be the same as those used in the first embodiment. The method for bonding the vibrating plate  32  to the pressurizing chamber forming member  31  may precede the method for bonding the vibrating plate  32  to the piezoelectric device  35  or vice versa. 
     With the above-described method, position matching accuracy can be improved because the position matching accuracy for the piezoelectric device  35  is equivalent to the patterning precision for the resist material  201 . 
     This method can be used for manufacturing the ‘carrier jet’ printer device  50 , explained by way of the second embodiment, with similar effects. 
     In the above-described first embodiment, the vibrating plate  32  is substantially of the same size as the pressurizing chamber forming member  31 , and the through-hole  32   b  is formed in the vibrating plate  32  for connection to the ink supply duct  36 . However, the present invention is not limited to this embodiment, such that similar effects can be obtained even if the vibrating plate  32  is smaller than the pressurizing chamber forming member  31  provided that the vibrating plate  32  is at least just large enough to cover the ink pressurizing chamber  31   c.    
     That is, the ink jet print head  7  may be configured so that the vibrating plate  32  is not present around the connection hole  31   g  provided in the pressurizing chamber forming member  31 . Since the through-hole  32   b  formed in the ink jet print head  7  of the first embodiment need not be provided in the present ink jet print head  7 , the step of punching the vibrating plate  32  can be omitted, while the bonding area between the vibrating plate  32  and the pressurizing chamber forming member  32   v  can also be reduced. Moreover, if the piezoelectric device  35  is formed after bonding the vibrating plate  32  to the pressurizing chamber forming member  31  as described above, the position matching reference can be directly provided in the pressurizing chamber forming member  31 , thus further improving position matching accuracy. 
     Meanwhile, this method can be applied to the manufacturing method for the ‘carrier jet’ printer device  50 , explained by way of the second embodiment, thus realizing similar effects. 
     In the above-described first embodiment, the orifice plate  33  formed of Neoflex having a glass transition temperature of not higher than 250° C. However, the present invention is again not limited to this configuration. That is, the effects similar to those realized with the above-described first embodiment can be realized using an orifice plate  91  shown in FIG. 24 in place of the orifice plate  33  used in the first embodiment. 
     This orifice plate  91  is made up of a first resin material  92  of Capton (manufactured by DU PONT) having a thickness of approximately 125 μm and a glass transition temperature of not higher than 250° C. and a second resin material  93  of Neoflex having a thickness of approximately 7 μm and a glass transition temperature of not higher than 250° C. The second resin material  93  of Neoflex is coated on one of the major surfaces of the first resin material  92 . If this orifice plate  91  is used, an ink emission hole  33   a  communicating with the ink inlet duct  31   e  is formed in the orifice plate  91 . 
     Since the orifice plate  91  is thicker than the orifice plate  33  used in the first embodiment, a higher strength can be achieved than if the orifice plate  33  is used. Moreover, since the ink emission hole  33   a  can be increased in length, the emitted ink liquid droplets can be improved in direction characteristics. 
     Although the above-described second embodiment refers to a case of using an orifice plate  73  of Neoflex having the glass transition temperature not higher than 250° C., the present invention is not limited to this configuration. That is, the effects similar to those realized with the above-described first embodiment can be realized using an orifice plate  91  shown in FIG. 21 in place of the orifice plate  73  used in the second embodiment. 
     In particular, if the orifice plate  91  is used in the ‘carrier jet’ printer head  56 , a certain allowance may be endowed to the angle of inclination of the ink emission hole  73   a , while the separation between the ink pressurizing chamber  71   c  and the dilution liquid pressurizing chamber  71   h  can be easily enlarged thus assuring positive prevention of ink leakage and leakage of the dilution liquid. 
     In this case, the ink emission hole  73   a  an the dilution liquid emission hole  73   b  communicating with the ink inlet hole  71   e  and with the dilution liquid inlet duct  71   j , respectively, are formed in the orifice plate  91 . 
     In the above-described first and second embodiments, the present invention is applied to the serial type ‘carrier jet’ printers  1  and  50 . However, the present invention is not limited to this configuration. For example, the present invention can be applied to a line type printer device  120  shown in FIG. 25 or to a drum rotation type printer device  130  shown in FIG.  26 . In FIGS. 24 and 26, parts or components similar to those of the serial type ‘carrier jet’ printer device  1  shown in FIG. 2 are denoted by the same reference numerals. 
     In the line type printer device  120 , a line head  121  comprised of a linear array of a large number of printer heads is mounted stationarily for extending in the axial direction. This line type printer device  120  is configured for simultaneously printing one row of letters by the line head  121  and for rotating the drum by one row of letters on completion of letter printing for a given row of letters to proceed to the letter printing of the next row. There may be contemplated such a method in which all lines are printed collectively or divided in plural blocks, or printing is made every other row. 
     In the drum rotation type printer device  130 , the ink is emitted from the print head  6  in synchronism with drum rotation to emit the ink from the print head  6  to generate an image on the printing paper sheet  4 . When the drum  2  completes one revolution to complete one row of letters on the printing paper sheet  4  in the circumferential direction, the feed screw  5  is rotated about its axis to move the printer head  6  by one pitch to proceed to next printing. In this case, the drum  2  and the feed screw  5  can be rotated simultaneously to move the printer head  6  slowly simultaneously with printing. If the printer head is a multi-ink-emission-hole type head, or the same place is printed repeatedly, printing is made spirally whist the drum  2  and the feed screw  5  are rotated simultaneously in operative association with each other. 
     In the above-described first and second embodiments, the ink pressurizing chamber forming member  31  and the pressurizing chamber forming member  71  are fabricated using metal members  38 ,  82  of, for example, stainless steel, approximately 0.1 mm in thickness. The present invention, however, is not limited to this configuration because various other numerical figures may be used as the thicknesses of the metal members  38 ,  82 . Since various chambers and holes in the ink pressurizing chamber forming member  31  and the pressurizing chamber forming member  71  are formed by etching, as described above, the thicknesses of the metal members  38 ,  82  are desirably set to not less than 0.07 mm. By setting the thicknesses of the metal members  38 ,  82  to not less than 0.07 mm, sufficient strength may be afforded to the metal members  38 ,  82  to enable the pressure increase in the ink pressurizing chambers  31   c  or  71   c  or in the dilution liquid pressurizing chamber  71   h.    
     In the above-described embodiments, the orifice plates  33 ,  73  are thermally pressure-bonded to the ink pressurizing chambers  31   c ,  71   c  at a press-working temperature of approximately 230° C. under a pressure of 20 to 30 kgf/cm 2  The present invention, however, is not limited to this configuration, such that various other numerical values may be used for thermally pressure bonding the orifice plates  33 ,  73  to the ink pressurizing chambers  31 ,  71  insofar as sufficient adhesion strength is assured. 
     In the above-described first and second embodiments, the excimer laser is used for forming the ink emission hole  33   a  in the resin material  41  and for forming the ink emission hole  73   a  and the dilution liquid emission hole  73   b  in the resin material  85 . The present invention, however, is not limited to this configuration because various other lasers, such as carbonic gas laser, may be used to form the ink emission hole  33   a , ink emission hole  73   a  and the dilution liquid emission hole  73   b.    
     In the above-described first and second embodiments, the ink pressurizing chamber  31   c  and the ink pressurizing chamber  71   c  are used as ink chambers in which the ink is charged to set a pre-set pressure. The present invention, however, is not limited to this configuration such that various other ink chambers may be used. 
     In the above-described first and second embodiments, the ink flow duct  31   d  and the ink flow duct  71   d  are used as ink flow ducts formed obliquely to the arraying direction of the ink chambers and adapted for supplying the ink supplied from the ink supply source to the ink chambers. The present invention, however, is not limited to this configuration such that various other ink flow ducts may be used. 
     Also, in the above-described first and second embodiments, the ink emission hole  33   a  and the ink emission hole  73   a  are used as the ink emission holes for emitting the ink from the ink chambers onto the recording medium when the pressure is applied to the respective ink flow ducts. The present invention, however, is not limited to this configuration such that various other ink emission holes may be used. 
     In the above-described second embodiment, the dilution liquid pressurizing chamber  71   h  is used as a dilution liquid pressurizing chamber into which is charged and pressurized the dilution liquid which is mixed with the ink during emission. The present invention, however, is not limited to this configuration such that various other dilution liquid chambers may be used. 
     In the above-described second embodiment, the dilution liquid flow duct  71   i  is used as the dilution liquid flow duct formed at an angle relative to the arraying direction of the dilution liquid chamber and which is adapted for supplying the dilution liquid supplied from the dilution liquid supply source to the respective dilution liquid chambers. The present invention, however, is not limited to this configuration such that various other dilution liquid flow ducts may be used. 
     In the above-described second embodiment, the dilution liquid emission hole  73   b  is used as the dilution liquid emission hole via which the dilution liquid supplied from the dilution liquid chambers is emitted to the recording medium when the pressure is applied to the respective dilution liquid flow ducts. The present invention, however, is not limited to this configuration such that various other dilution liquid emission holes may be used. 
     In the above-described second embodiment, the ink pressurizing chamber forming member  31  and the pressurizing chamber forming member  71  are used as metal plates in which the ink chambers and ink ducts are formed by punching. The present invention, however, is not limited to this configuration such that various other dilution metal plates formed with the ink chambers and ink ducts may be used. 
     In the above-described second embodiment, the orifice plates  33 ,  73  are used as the plate-shaped resin members formed with ink emission holes. The present invention, however, is not limited to this configuration such that various other dilution liquid emission holes may be used. 
     In the above-described second embodiment, the orifice plates  33 ,  73  formed of Neoflex having a thickness of approximately 50 μm and the glass transition temperature of not higher than 250° C. are used as the resin members having the glass transition temperature of not higher than 250° C. The present invention, however, is not limited to this configuration such that various other resin members may be used if the glass transition temperature thereof is not higher than 250° C. 
     In the above-described second embodiment, the orifice plate  91  is used as the layered resin material comprised of a first resin material with the glass transition temperature of not lower than 250° C. and a second resin material with the glass transition temperature of not higher than 250° C. The present invention, however, is not limited to this configuration since various other resin members may be used as the layered resin material comprised of the first resin material with the glass transition temperature of not lower than 250° C. and the second resin material with the glass transition temperature of not higher than 250° C. 
     Also, in the above-described first and second embodiments, the ink buffer tank  31   f  and the ink buffer tank  71   f  are used as ink delivery means for delivering the ink supplied from the ink supply source. The present invention, however, is not limited to this configuration since various other ink delivery means may be used. 
     Further, in the above-described first and second embodiments, the ink buffer tank  71   f  is used as dilution liquid delivery means for delivering the dilution liquid supplied from the dilution liquid supply means for mixing with the ink at the time of emission. The present invention, however, is not limited to this configuration since various other dilution liquid delivery means may be used.