Patent Publication Number: US-6209988-B1

Title: Ink jet recording head and ink jet recording apparatus

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an ink jet recording head for executing a record on a recorded medium by jetting inks, and to an ink jet recording apparatus including the ink jet recording head. 
     2. Related Background Art 
     An ink jet recording system has hitherto been adopted as a recording system in a recording apparatus such as a printer etc. The ink jet recording system may be a recording method, wherein inks are jetted out of orifices formed in an ink jet recording head and adhered to a recorded material such as a sheet of paper etc, thus performing the record. The ink jet recording system, which causes an extremely small amount of noise and is capable of high-speed recording, has therefore spread in recent years. What is known as the ink jet recording head is a head including a piezoelectric element and an exothermic element serving as an energy generating member for generating an energy utilized for jetting the inks out of the orifices. In particular, a so-called bubble jet type recording head is structured in such a way that bubbles are formed by applying the thermal energy generated by the exothermic element to the inks and heating the inks abruptly, and ink liquid droplets in ink channels are jetted out of the orifices by utilizing these bubbles. The thus structured recording head has advantages of exhibiting a high responding property to a recording signal and easily attaining a higher density. 
     A typical example of the ink jet recording head described above will be explained. FIG. 7 is a partially cut-off perspective view showing one example of a jetting element  1  related to the background art. A channel wall layer  121  serving as a recessed side wall for forming an ink channel  103  and a common ink chamber  104 , is laminated on a recording element substrate  101 , and a top plate  122  is laminated on the channel wall layer  121 . An exothermic element  102  defined as an electro-thermal converting member as well as being an energy generating member for generating the energy utilized for jetting the inks, is provided, corresponding to each ink channel  103 , on an insulating layer on an upper surface of the recording element substrate  101 . Further, there are provided an unillustrated electric wire for electrifying each exothermic element  102  and a connecting terminal  110  disposed at an edge portion of the electric wire. One edge portions of the ink channels  103  are formed with orifices (jetting ports)  105  each opened to the outside, and the other edge portions communicate with the common ink chamber  104 . 
     FIG. 8 is a perspective view showing one example of a recording element unit related to the background art. As illustrated in FIG. 8, the ink jetting element  1  described above is bonded to a base plate  107  having a positioning pin  108  and a positioning hole  109 . In this case, the ink jetting element  1  is bonded thereto at a high relative positional accuracy with respect to the positioning pin  108  and the positioning hole  109 . Then, the ink jetting element  1  is fitted with an ink supply member  106  for guiding the ink to the common ink chamber  104 . The ink can be supplied to the ink supply member  106  from a separately provided ink tank (unillustrated). Thus, the recording element unit  10  including the ink jetting element  1  is constructed. 
     This recording element unit  10  is structured such that the exothermic element  102 , upon receiving an electric signal, emits heat for heating the ink in the ink channel  103 , then the heated ink bubbles up, and the ink is jetted out of the orifice  105  by dint of the bubbles, thus recording an image on the recorded medium. 
     Note that the recording element unit described above includes a plurality of recording elements (exothermic elements)-disposed therein, which must be each independently drive-controlled because of a plurality of dots being simultaneously recorded. A driving element for controlling the recording elements in this way is formed normally on a driving element substrate defined as a separate member from the recording element substrate. This driving element substrate is brought into press-contact with the recording element substrate, thereby connecting the driving elements to the recording elements. The reason for having adopted the construction described above is that if a defect appears in any one of the recording element and the driving element, and these elements are formed on the same substrate, then the whole unit would be deemed defective even if one element is normal. In such a case, there would be no alternative but to replace the substrate as it is mounted with the recording element and the driving element. By contrast, however, if the recording element and the driving element are formed on separate substrates, it might be sufficient that only the substrate having the defective element with respect to the recording element substrate and the driving element substrate is replaced while the normal substrate is not required to be replaced, which is efficient. 
     FIGS. 9 and 10 show a construction in which the recording element unit  10  formed with the exothermic elements (recording elements)  102  (not shown) and the driving element unit  20  on which to dispose the driving element for driving the exothermic elements, are provided as separate units and electrically connected by bringing their connecting terminals into press-contact with each other. FIG. 9 is an exploded perspective view showing one example of the recording element unit and the driving element unit related to the background art. FIG. 10 is a side view showing one example of the recording element unit and the driving element unit related to the background art. 
     The driving element unit  20  is constructed of a driving element substrate  4  provided with connecting terminals  23  to connect to connecting terminals  110  of the jetting element unit  1  and on which driving elements  22  are disposed. Printed circuit board (PCB)  5  is connected via a bonding wire  6  etc to the driving element substrate  4 , and the driving element substrate  4  and the printed circuit board  5  are mounted to a base plate  21 . The bonding wire  6 , the connecting terminal  23  and the driving elements  22  are electrically connected to each other through unillustrated wiring patterns. The printed circuit board  5  is supplied with energy generating power and a driving signal from outside circuits via a cable  26 . Further, the driving element unit  20  is provided with a positioning hole  15  and a positioning pin  14  which correspond to a positioning pin  108  and a positioning hole  109  of the recording element unit  10 . Then, the cable  26  is attached to a rear portion of the printed circuit board  5 , and the recording element unit  10  is fitted to the driving element unit  20  in a state where the unit  10  is turned over from the state shown in FIG.  8 . At this time, the positioning pin  108  is fitted into the positioning hole  15 , and the positioning pin  14  is fitted into the positioning hole  109  respectively, thus completing the positioning process. With this process, as schematically illustrated in FIG. 10, the connecting terminal  110  of the recording element unit  10  comes into direct-contact with the connecting terminal  23  of the driving element unit  20 , thus taking a conduction therebetween. FIG. 10 is a side view showing one example of the recording element unit and the driving element unit related to the background art. 
     FIG. 11 is a side view showing another example of the recording element unit and the driving element unit related to the background art. Further, FIGS. 12A and 12B are partially enlarged side sectional views of FIG.  11 . FIG. 12A shows a state before the connection, and FIG. 12B shows a state after the connection. Japanese Patent Application Laid-Open Publication No. 1-302829 discloses a construction in which, as illustrated in FIGS. 11,  12 A and  12 B, the two connecting terminals  110 ,  23  are connected to each other via an electric connecting member  310 . This electric connecting member  310  includes a plurality of thin conductive members  311  embedded in an insulation holding body  312 , thus giving a conduction in a vertical direction in FIGS. 11,  12 A and  12 B. Then, the electric connecting member  310  is sandwiched in between the recording element substrate  101  and the driving element substrate  4 , and the connecting terminals  110 ,  23  are electrically connected by press-fitting the recording element substrate  101  and the driving element substrate  4  to each other. 
     Thus, when the recording element unit  10  and the driving element unit  20  are formed as the separate units, if a fault is caused in the recording element unit  10  or the recording element unit  10  becomes incapable of recording due to an expiration of its life-time, the system can be recovered simply by replacing only the recording element unit  10 , which might be highly advantageous in terms of reducing the costs. 
     The conventional ink jet recording head having the recording element unit  10  described above which is replaceable, since it may be attached to and detached from the driving element unit  20 , is provided with a press-fitting mechanism for applying pressure upon a joining portion between the recording element substrate  101  and the driving element substrate  4  in order to ensure the contact between the connecting terminals  110 ,  23 . FIGS. 13A and 13B are partially-cut-off side views showing the press-fitting mechanism pertaining to the background art. FIG. 13A shows a state before the connection by this press-fitting mechanism. FIG. 13B shows a state of being connected. 
     Herein, a rotary shaft  35  is attached to a head base  50  on which the driving element unit  20  is placed. A spring-like resilient member  34  coming into contact with the recording element unit  10  is fitted to one edge portion of a press-fitting plate  33  rotatable about the rotary shaft  35 . Further, a rotatable cam  32  is attached to the head base  50 , and the other edge portion of the press-fitting plate  33  serves as an operating portion  33   a  capable of engaging with the cam  32 . Then, when a lever (unillustrated) linked to the cam  32  is rotated from the state shown in FIG. 13A, the linked cam  32  rotates and pushes up the press-fitting plate  33 , with the result that the press-fitting plate  33  rotates about the rotary shaft  35 . Then, the connecting terminal  23  of the recording element unit  20  is pushed against and thus connected to the connecting terminal  110  of the driving element unit  10  by a desired pressing force given from the resilient member  34  fixed to the press-fitting plate  33 . 
     In the press-fitting mechanism shown in FIG. 13A and 13B, as the press-fitting plate  33  moves while rotating about the rotary shaft  35 , the resilient member  34  comes into contact with the recording element unit  10  and pushes up the recording element unit  10  to such an extent that the connecting terminal  110  of the recording element unit  10  impinges upon the connecting terminal  23  of the driving element unit  20 . The resilient member  34  makes the recording element unit  10  further intruded, thereby generating a pressing force acting upon the recording element unit  10  due to a flexure of the resilient member  34  itself. In the process of giving this pressing force, however, a contact position between the resilient member  34  and the recording element unit  10  has a deviation  6  as shown in FIG. 14 in terms of a relationship between a rotational shift of the fitting position of the resilient member  34  and a quantity of deformation of the resilient member  34 . Therefore, the recording element unit  10  is unable to be pushed strictly perpendicularly to the driving element unit  20 , resulting in a problem in which a well-connected state is obtained with a difficulty. FIG. 14 is a partially enlarged cut-off side view of FIGS. 13A and 13B. 
     Especially when the recording elements  102  and the orifices  105  are arranged with a high density in order to correspond to hyperfine printing and a speed-up thereof, the number of the connecting terminals  110 ,  23  also increases with a high density, and therefore the deviation of the contact position between the resilient member  34  and the recording element unit  10  might make incomplete the electric connection between the two connecting terminals  110 ,  23 . 
     SUMMARY OF THE INVENTION 
     It is a primary object of the present invention to provide an ink jet recording head and an ink jet recording apparatus which are capable of attaining a more ensured electric connection between a recording element unit and a driving element unit. 
     To accomplish the above object, according to one aspect of the present invention, an ink jet recording head comprises a recording element unit including a recording element for generating an energy utilized for jetting an ink and a connecting terminal connected to the recording element, a driving element unit including a driving element for driving the recording element and a connecting terminal connected to the driving element, a pressing force generating mechanism for generating a pressing force for pressing the recording element unit and the driving element unit in such a direction as to make the recording element units and the driving element units proximal to each other so that the two connecting terminals are connected to each other, and a pressing force transmission member interposed between the pressing force generating mechanism, the recording element unit and the driving element unit and having a rigidity enough to transmit the pressing force to the recording element unit or the driving element unit while coming into contact with the recording element unit or the driving element unit so that the pressing force given from the pressing force generating mechanism acts upon a connecting portion between the two connecting terminals. 
     According to another aspect of the present invention, an ink jet recording apparatus comprises the thus constructed ink jet recording head, whereby a high reliability is exhibited. 
     According to the present invention, there is no deviation of a contact position (pressing force acting position) between the pressing force transmission member having a rigidity and the recording element unit or the driving element unit, and the pressing force can be surely transmitted, whereby an assured electric connection between the recording element unit and the driving element unit can be obtained. 
     According to the present invention, it is preferable that two pluralities of connecting terminals of the recording element unit and of the driving element are each arranged in line, and that the pressing force transmission member makes the pressing force act directly linearly upon regions corresponding to the lines of the two pluralities of connecting terminals. It is also preferable in terms of a certainty of the electric connection that the pressing force acts substantially perpendicularly to the surface on which the two connecting terminals are disposed. It is preferable as a specific construction for attaining what is described above that the central axis of the rotation of the pressing force transmission member is substantially flush with the contact position between the pressing force transmission member and the recording element unit or the driving element unit. 
     According to the present invention, it is preferable that the pressing force transmission member is divided into a plurality of pressing force transmission sub-members in an array direction of the recording elements of the recording element unit, and it is more preferable that the pressing force generating mechanism is divided into a plurality of pressing force generating sub-mechanisms corresponding to the divided pressing force transmission sub-members. Based on this construction, it is feasible to exert the pressing force substantially equally over an entire width of even a wider ink jet recording head of a full-line type etc, finely corresponding to warping and waviness of the recording element unit and the driving element unit. 
     These together with other objects and advantages which will be subsequently apparent, reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     Other objects and advantages of the present invention will become apparent during the following discussion in conjunction with the accompanying drawings, in which: 
     FIG. 1 is a partially cut-off side view showing an ink jet recording head in a first embodiment of the present invention; 
     FIG. 2 is a partially cut-off side view showing the ink jet recording head in a second embodiment of the present invention; 
     FIG. 3 is a side view showing the ink jet recording head in a third embodiment of the present invention; 
     FIG. 4 is a side view showing the ink jet recording head in a fourth embodiment of the present invention; 
     FIG. 5 is a perspective view showing the ink jet recording head in a fifth embodiment of the present invention; 
     FIG. 6 is a perspective view showing the ink jet recording head in a sixth embodiment of the present invention; 
     FIG. 7 is a partially cut-off perspective view showing one example of an ink jet element related to the background art; 
     FIG. 8 is a perspective view showing one example of a recording element unit related to the background art; 
     FIG. 9 is an exploded perspective view showing one example of the recording element unit and the driving element unit related to the background art; 
     FIG. 10 is a side view showing one example of the recording element unit and the driving element unit related to the background art; 
     FIG. 11 is a side view showing another example of the recording element unit and the driving element unit related to the background art; 
     FIGS. 12A and 12B are partially enlarged side sectional views of FIG. 11; 
     FIGS. 13A and 13B are partially cut-off side views showing a press-fitting mechanism related to the background art; 
     FIG. 14 is a partially enlarged cut-off side view of FIG. 11; 
     FIG. 15 is a perspective view showing the principal portion of an ink jet recording apparatus; 
     FIG. 16 is a block diagram of the ink jet recording apparatus; and 
     FIG. 17 is a perspective view showing the principal portion of an ink jet recording system. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of the present invention will hereinafter be described with reference to the accompanying drawings. Note that a recording element unit  10  and a driving element unit  20  have constructed substantially the same as those shown in FIGS. 7 to  10 , and hence the constructions thereof are explained referring to those Figures. 
     As shown in FIG. 7, a recording element substrate  101  of an ink jet element  1  is constructed such that the substrate composed of silicon and a metal is coated with SiO 2  as an insulating layer. An HfB 2  layer for forming an exothermic element  102  serving as an energy generating body for generating an energy utilized for jetting inks, is formed on the insulating layer, and a connecting terminal  110  (FIG. 8) is disposed at an edge portion of an electrode for electrifying the exothermic element  102 . Ink channels  103  are formed in portions corresponding to the exothermic elements  102  on the recording element substrate  101 , and a common ink chamber  104  communicating with each of the ink channels  103  is further formed. As illustrated in FIG. 8, the ink jet element  1  is bonded at a high positional accuracy to a base plate  107  composed of aluminum (Al) and having a positioning pin  108  and a positioning hole  109 , and further ink supply members  106  for guiding the inks to the common ink chamber  104  of the ink jet element  1  are fitted to the base plate  107 . 
     As shown in FIG. 9, a driving element substrate  4  of a driving element unit  20  is packaged with driving elements  22  each structured in the form of an IC chip for driving the exothermic element  102 . The driving elements  22  are electrically connected to a printed circuit board  5  via a bonding wire  6 , and the printed circuit board  5  is provided with a connector  5   a,  for taking in a driving signal and driving electric power as well from outside, to which a cable  26  for transmitting an electric signal is attached. The thus constructed recording element unit  10  is joined to the driving element unit  20 , and positioning pins  108 ,  14  provided respectively are fitted into positioning holes  109 ,  15 , whereby connecting terminals  110 ,  23  are, as shown in FIG. 10, connected with a high accuracy. 
     First Embodiment 
     FIG. 1 is a partially cut-off side view showing an ink jet recording head in a first embodiment of the present invention. A head base  50  is fitted with the driving element unit  20 , a rotatable cam  32 , and a lever (unillustrated) connected to the cam  32 . The driving element unit  20  on the head base  50  is fitted with a rotary shaft  35  to which a fitting portion  33   b  of a press-fitting plate  33  is attached, and with a pressing force transmission member  36  rotatable about the rotary shaft  40 . A spring-like resilient member  34  is provided at one edge portion of the press-fitting plate rotatable about the rotary shaft  35 , and the other edge portion of the press-fitting plate  33  serves as an operating portion  33   a  brought into contact with the cam. A mechanism, which includes at least the cam  32 , the press-fitting plate  33  and the resilient member  34  and exerts a pressing force upon the pressing force transmission member  36 , is generically referred to as a “pressing force generating mechanism”. The pressing force transmission member  36  coming into contact with the resilient member  34  of the press-fitting plate  33  has a rigidity to such an extent that the member  36  is not deformed even by pressing the recording element unit  10  while rotating it, and is composed of a metal and ceramic etc. 
     An operation of this press-fitting mechanism is explained. To start with, the driving element unit  20  and the recording element unit  10  are placed on the head base  50 , in which state the cam  32  is rotated by moving the lever (not shown). Thereupon, with a rotating operation of the cam  32 , the operating portion  33   a  of the press-fitting plate  33  is pushed up, with the result that the press-fitting plate  33  rotates about the rotary shaft  35 . Then, the resilient member  34  fitted to the press-fitting plate  33  comes into contact with the pressing force transmission member  36 . Subsequently, the pressing force transmission member  36  rotates about the rotary shaft  40  impinges upon the recording element unit  10 . As shown in FIG. 1, in a state where the cam  32  pushes up the operating portion  33   a  of the press-fitting plate  33  at the maximum, the recording element unit  10  is pressed by the pressing force of the pressing force transmission member  36  in such a direction as to become proximal to the driving element unit  20 , whereby the connecting terminal  110  of the recording element unit  10  is brought into press-contact with the connecting terminal  23  of the driving element unit  20 . The pressing force of the pressing force transmission member is absorbed to some extent by a flexure deformation of the resilient member  34 , and an adjustment is made so as not to apply an excessive load. 
     At this time, the pressing force transmission member  36  is supported by the driving element unit  20  and has no flexure deformation during a series of these operations, and therefore it never happens that a deviation is caused with respect to the recording element unit  10 . Accordingly, the connecting terminal  110  of the recording element unit  10  is surely electrically connected to the connecting terminal  23  of the driving element unit  20 . 
     Further, in accordance with the first embodiment, a plurality of the connecting terminals of the recording element units and a plurality of the connecting terminals of the driving element unit, are both arranged in lines, and the pressing force transmission member makes the pressing force act directly linearly upon regions corresponding to the lines of the pluralities of the connecting terminals of both of units. This construction is therefore preferable in terms of a certainty of the electric connection. Further, the above pressing force acts substantially perpendicularly upon the surfaces on which the two groups of connecting terminals are disposed, which is also preferable in terms of the certainty of the electric connection. 
     Second Embodiment 
     FIG. 2 is a partially cut-off side view showing the ink jet recording head in a second embodiment of the present invention. A difference in terms of the construction in the second embodiment from the first embodiment is that a pressing force transmission member  51  and a rotary shaft  52  are provided so that the center of the rotary shaft  52  of the pressing force transmission member is substantially flush with an upper surface of the recording element unit  10  in a state of its being placed together with the driving element unit  20  on a head base  50 . With this contrivance, the pressing force acts only in a direction substantially perpendicular to the joining surface between the recording element unit  10  and the driving element unit  20 , whereby a more assured electric connection can be attained. Note that other configurations are the same as those in the first embodiment, of which the explanation is therefore omitted. 
     Third Embodiment 
     FIG. 3 is a side view showing the ink jet recording head in a third embodiment of the present invention. In the third embodiment, the same recording element unit  10  and driving element unit  20  as those in the first embodiment, are placed on the head base  50 . A pressing force transmission member  54  rotatable about a rotary shaft  53  is fitted to the driving element unit  20 . One edge of the pressing force transmission member  54  can be brought into direct contact with the upper surface of the recording element unit  10 . A plate spring-like resilient member  55  is attached to the other edge of the pressing force transmission member  54 . Then, this resilient member  55  serves an operating portion coming into contact with the cam  32 . 
     Based on this construction, when the cam  32  rotates upon operating the unillustrated lever, the cam  32  pushes up the resilient member  55 , and the pressing force transmission member  54  fixedly fitted to the resilient member  55  rotates about the rotary shaft  53 , with the result that a front edge of the pressing force transmission member  54  impinges upon the upper surface of the recording element unit  10 . Thereafter, when the cam  32  further rotates, the pressing force transmission member  54  presses the recording element unit  10  by a substantially fixed pressing force while causing a flexure deformation of the resilient member  55 . As in the first embodiment, the pressing force transmission member  55  coming into direct contact with the recording element unit  10  is not deformed in flexure, and hence the deviation as occurred in the prior art does not appear between the pressing force transmission member  55  and the upper surface of the recording element unit  10 . There by obtaining the ensured electric connection between the connecting terminal  110  of the recording element unit  10  and the connecting terminal  23  of the driving element unit  20 . 
     Further, according to the third embodiment, the number of parts can be reduced, and therefore the costs can be decreased. Moreover, a thickness of the whole recording head can be made smaller than in the first embodiment, which is effective in downsizing the recording apparatus. Further, in the recording apparatus structured such that a plurality of recording heads are arranged for executing a color recording process, a pitch between the recording heads disposed in a side-by-side relationship can be decreased. If the head-to-head pitch is large, this might cause a deterioration in accuracy because of the recorded medium being made elastic and fed in ununiformity, which consequently leads to a decline in a recording quality. In the third embodiment, however, it is feasible to decrease the pitch between the recording heads as described above, and the recording accuracy can be therefore enhanced. In particular, that might be extremely effective when adopting the recording apparatus for effecting the color record, wherein the positional adjustment must be precisely done so that dots in respective colors are overlapped. 
     Fourth Embodiment 
     FIG. 4 is a side view showing the ink jet recording head in a fourth embodiment of the present invention. A difference in terms of the construction from the third embodiment is that a pressing force transmission member  56  and a rotary shaft  57  are provided so that the center of the rotary shaft  57  of the pressing force transmission member  56  is substantially flush with the upper surface of the recording element unit  10  in a state of its being placed together with the driving element unit  20  on the head base  50 . With this contrivance, as in the second embodiment, the pressing force acts only in the direction substantially perpendicular to the joining surface between the recording element unit  10  and the driving element unit  20 , whereby a more assured electric connection can be attained. Note that other configurations are the same as those in the third embodiment, of which the explanation is therefore omitted. 
     Fifth Embodiment 
     FIG. 5 is a side view showing the ink jet recording head in a fifth embodiment of the present invention. In the first and second embodiments, the single pressing force transmission member is provided for one joining body of the recording element unit  10  and the driving element unit  20 . In the fifth embodiment, however, a plurality (e.g., five) of pressing force transmission members  36   a  to  36   e  are provided for one joining body of the recording element unit  10  and the driving element unit  20 . FIG. 5 shows only resilient members  34   a  to  34   e  fixed to the pres-fitting plate  33  with an omission of the illustrations of the cam  32 , the press-fitting plate  33  and the rotary shaft  35 . Each of the pressing force transmission members  36   a  to  36   e  has substantially the same construction as that in the first embodiment. In the fifth embodiment, however, the resilient members and the pressing force transmission members are provided separately in a plurality of positions in a widthwise direction of the head (which is an array direction of the recording element  10 ). Then, each of the pressing-force transmission members  36   a  to  36   e  is attached to each of rotary shafts (of which four rotary shafts are omitted in their illustration excluding a rotary shaft  40   a ), and is independently rotatable. 
     In the fifth embodiment, even when warping and waviness occur in the recording element unit  10  or the driving element unit  20 , the plurality of separate pressing force transmission members  36   a  to  36   d  are individually, independently brought into contact with the recording element unit  10 , and hence the pressing force can be equally distributed over an entire width of the recording element unit  10 . Accordingly, it is possible to correspond to a wider recording head, e.g., an ink jet recording head of a full-line type having an A4 width or an A3 width, and the assured electric connection can be attained. Incidentally, it is preferable that the cam  32 , the press-fitting plate  33  and the rotary shaft  35 , though not illustrated, are each separately provided in a plurality of positions corresponding to the pressing force transmission members  36   a  to  36   e.    
     Sixth Embodiment 
     FIG. 6 is a side view showing the ink jet recording head in a sixth embodiment of the present invention. In the sixth embodiment, based on substantially the same construction in the third embodiment, a plurality of pressing force transmission members are provided as in the fifth embodiment. To be more specific, for one joining body of the recording element unit  10  and the driving element unit  20 , there are provided a plurality (e.g., five) of pressing force transmission members  54   a  to  54   e,  a plurality of cams (of which four cams are omitted in their illustration excluding a cam  32   a ), a plurality of rotary shafts (of which four rotary shafts are omitted in their illustration excluding a rotary shaft  53   a ), and a plurality of resilient members  55   a  to  55   e.  According to the sixth embodiment also, as in the fifth embodiment, the plurality of separate pressing force transmission members  54   a  to  54   e  are each independently capable of equally distributing the pressing force over the entire width of the recording element unit  10  while being in contact therewith, thereby exhibiting an effect of being able to correspond to the wider recording head. 
     Note that the present invention may provide such a construction that an electric connecting member is interposed between the two connecting terminals  110 ,  23  as in the examples shown in FIGS. 11,  12 A and  12 B. Another construction may be such that the rotary shaft of the pressing force transmission member and the rotary shaft of the press-fitting plate are supported not on the driving element unit  20  but on the head base  50 . Moreover, the recording element unit and the driving element unit may be switched with each other in terms of their positions. 
     (Liquid Jet Apparatus) 
     FIG. 15 schematically illustrates a construction of a liquid jet apparatus mounted with the above described liquid jet head. In this embodiment, particularly an ink jet recording apparatus IJRA using inks as liquids to be jetted will be exemplified. A carriage HC of the liquid jet apparatus is mounted with a head cartridge to and from which a liquid container  90  for containing the inks and a liquid jet head member  200  are attachable and detachable. The carriage HC reciprocates in widthwise directions (indicated by arrows a and b) of the recorded medium such as a record sheet etc. carried by a recorded medium carrier unit. 
     Referring to FIG. 15, when an unillustrated driving signal supply unit supplies a driving signal to a liquid jet unit on the carriage HC, a recording liquid is jetted out of the liquid jet head member  200  to a recorded medium  150  in accordance with the driving signal. 
     Further, the liquid jet apparatus in this embodiment includes a motor  111  serving as a driving source for driving the recorded medium carrier unit and the carriage HC, gears  112 ,  113  for transmitting the power to the carriage HC from the driving source, and a carriage shaft  85 . Based on the recording apparatus and a liquid jetting method of the present invention which is carried out by the recording apparatus, a well-recorded image could be obtained by jetting the liquids to a variety of recorded mediums. 
     FIG. 16 is a block diagram showing a whole apparatus for operating the ink jet recording apparatus to which the liquid jet head of the present invention is applied. The recording apparatus receives print information as a control signal from a host computer  300 . The print information is temporarily stored in an I/O interface  301  within a printing apparatus as well as being converted into data which can be processed in the recording apparatus, and is inputted to a CPU  302  serving also as a head driving signal supply unit. The CPU  302  processes the data inputted to the CPU  302  by use of a peripheral unit such as a RAM  304  etc. and converts the data into print data (image data) on the basis of a control program stored in a ROM  303 . 
     Further, the CPU  302  creates drive data for driving a drive motor  306  for moving a head  200  and the record sheet in synchronization with the image data in order to record the image data in a proper position on the record sheet. The image data and the motor drive data are transmitted to the head  200  and the driving motor  306  respectively through a head driver  307  and a motor driver  305 , and the head  200  and the driving motor  306  are driven respectively at controlled timings, thereby forming an image. 
     The recorded medium, applicable to the above-described recording apparatus, onto which the liquid such as the ink is jetted, may include various sheets of paper, an OHP sheet, a plastic material used for a compact disk and a decoration plate etc., a dishcloth, a metallic material such as aluminum and cooper etc., a leather material such as a cowskin, a pigskin and an artificial leather etc., a wood material such as wood and plywood etc., a bamboo material, a ceramic material like a tile, and a three-dimensional structure such as a sponge etc. 
     Moreover, the recording apparatus described above may include a printer apparatus for recording on the various sheets of paper and the OHP sheet, a plastic-oriented printing apparatus for recording on the plastic material such as the compact disk etc., a metal-oriented recording apparatus for recording on a metal plate, a leather-oriented recording apparatus for recording on the leather, a wood-oriented recording apparatus for recording on the wood, a ceramic-oriented recording apparatus for recording on the ceramic material, a recording apparatus for recording on the three-dimensional mesh structure such as the sponge etc., and a textile printing apparatus for printing on the dishcloth. 
     Further, the liquids adapted to the respective recorded mediums and meeting with record conditions may be used as the jet liquids used for these liquid jet apparatuses. 
     (Recording System) 
     Given next is an explanation of one example of an ink jet recording system for recording on the recorded medium by use of the liquid jet heat of the present invention as a recording head. FIG. 17 is an explanatory schematic diagram showing a construction of the ink jet recording system using the liquid jet head of the present invention, which has been described so far. The liquid jet heat in this embodiment is classified as a full-line type head in which a plurality of orifices are arranged at an interval of 360 dpi to a length corresponding to a recordable width of a recorded medium  150 , and a holder  202  fixedly holds four heads  201   a  to  201   d  corresponding to four colors, yellow (Y), magenta (M), cyan (C) and black (B) which are disposed in parallel to each other at a predetermined interval in a direction X. 
     A head driver  307  constituting the driving signal supply unit supplies each of these heads  201   a  to  201   d  with a signal, and each of the heads  201   a  to  201   d  is driven based on this signal. The heads  201   a  to  201   d  are supplied with the inks in four colors of Y, M, C, Bk as jetting liquids. 
     Further, head caps  203   a  to  203   d  each incorporating an ink absorbing member such as a sponge etc, are provided downwardly of the heads  201   a  to  201   d  and cover the orifices of the heads  201   a  to  201   d  when in a non-recording process, thereby performing maintenance of the heads  201   a  to  201   d.  The numeral  206  designates a carrier belt constituting a carrier device for carrying the variety of recorded mediums explained in the embodiments discussed above. The carrier belt  206  is extended along a predetermined route through a variety of rollers, and is driven by a driving roller connected to the motor driver  305 . 
     In the ink jet recording system in this embodiment, a pre-treatment apparatus  251  and a post-treatment apparatus  252  for executing a variety of treatments upon the recorded medium before and after recording are individually disposed upstream and downstream of a recorded medium carrier route. The pre-treatment and the post-treatment have different contents depending upon a type of the recorded medium on which to effect recording and a kind of the ink. The recorded medium composed of, e.g., the metal, plastic and ceramic etc. is irradiated with ultraviolet rays and ozone as the pre-treatment, and the surface thereof is thus activated, whereby an adhesion of the ink can be enhanced. Furthermore, in the recorded medium composed of the plastic etc in which the static electricity is easily generated, dusts are easy to adhere to the surface by the static electricity, and an ill-recorded state might occur due to the dusts in some cases. 
     Therefore, the static electricity is removed out of the recorded medium by use of an ionizer as the pre-treatment, thus removing the dusts from the recorded medium. Further, when the dishcloth is used as the recorded medium, there may be executed a treatment, as the pre-treatment, of applying to the dishcloth a substance selected out of an alkalic substance, a water-soluble substance, a synthetic high polymer, water-soluble metallic salt, urea and thio-urea in terms of preventing a blur and enhancing a degree of exhaustion. The pre-treatment is not limited to this treatment but may be a treatment of setting a temperature of the recorded medium to a temperature optimal to the record. On the other hand, as the post-treatment, there are executed a thermal treatment upon the recorded medium to which the ink is jetted, a fixing treatment of speeding up the fixation of the ink by the irradiation of the ultraviolet rays, and a treatment of cleaning a residual treatment agent applied in the pre-treatment but remaining non-reacted. 
     Note that the full-line heads have been exemplified as the heads  201   a  to  201   d  in this embodiment, however, the heads are not limited to those described above, and there may be taken such a type that the small-sized head explained above is moved in the widthwise directions of the recorded medium thus effects the record. 
     The many features and advantages of the invention are apparent from the detailed specification and, thus, it is intended by the appended claims to cover all such features and advantages of the invention which fall within the true spirit and scope of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation illustrated and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.