hereinafter , the embodiments of the present invention will be described in accordance with fig1 through fig2 . at first , a first embodiment of the multi - chip - module provided with the cooling system for chips will be described in accordance with fig1 - 5 , fig7 and fig8 . the cooling system is of such a structure that the heat generated by chips 1 is exhausted to the outside of the module by the coolant 11 which flows into the coolant supply pipe 5 from the pipe arrangement 7 to perform heat exchange while flowing through the straight tube sections of the coolant supply pipe 5 , which are in contact with the upper faces of the chips 1 and flows out to the pipe arrangement 8 . as the coolant 11 , water , a low - boiling - point dielectric liquid , or the like , can be used , for example . the coolant supply pipe 5 is formed with the straight tube sections having the elliptic or oval cross - section , and the flexible bellows sections alternately in the axial direction of the pipe as shown in fig7 . also , as shown in fig8 the cross - section of the straight tube section 5b of the coolant supply pipe 5 may be square or the like . further , the length and width of the straight tube section 5b of the coolant supply pipe 5 should be larger than those of the chip 1 . the bellows section 5a is a member which absorbs the camber of the circuit board 3 , the irregular heights of chips 1 when assembled , and the displacement caused by the thermal distortion while in operation as well as functions as the flow passage for the coolant 11 . also , the straight tube section 5b is joined to the top face of the chip 1 by soldering , brazing , or the like to transfer the heat generated by the chip 1 to the coolant by the thermal conduction of this face . here , an insulating layer 30 is provided on the upper face of the chip 1 to electrically insulate the chip and the coolant supply pipe 5 after these two are joined together . as the material of the coolant supply pipe 5 , a material having resilience , and corrosion resistance to the coolant 11 such as phosphor bronze , titanium , and stainless steel can be used . in this respect , the coolant supply pipe 5 can be produced by a plastic working such as a hydraulic formation . in addition to the cooling system set forth above , there are a large number of chips 1 on the circuit board 3 , which are electrically connected with each other through the terminals 2 thereof , and on the lower face of the circuit board 3 , there are a large number of i / o leads 17 to connect the circuit board to a printed circuit board 24 ; thus configurating the multi - chip - module 50 . now , in conjunction with fig3 and fig4 the method of assembly will be described . both ends 5c and 5d of the coolant supply pipe 5 are inserted into the catching holes 4d and 4e provided on the inner sides of the housing 4 to which pipe arrangements 7 and 8 have already been connected , and the joining 10 is performed by soldering , brazing , or the like . here , the connecting position of the coolant supply pipe 5 is such that the joining face of the straight tube section 5b of the coolant supply pipe 5 is located at a position substantially the same as the height of the upper face of the chip 1 after the assembly . subsequently , these are covered over the circuit board 3 where the chips 1 are fixed by the terminals 2 . here , a predetermined amount of paste form solder or brazing material is applied to each of the upper faces 6 of the chips 1 and sealing portions 9 . then , in the atmosphere of helium or nitrogen gas , or the like , the sealings 9 are performed by soldering , brazing , or the like , and at the same time , helium or nitrogen gas or the like are filled . fig4 is a view illustrating the assembled multi - chip - module 50 with a partially cut - away housing 4 . now , fig5 is a view showing an example in which these multi - chip - modules 50 are arranged on a printed circuit board 24 . here , the coolant 11 is guided into each of the pipe arrangements 7 from a main in - flow pipe 22 and is allowed to flow out from a main out - flow pipe 23 through each of the coolant supply pipes 5 and pipe arrangements 8 ; thus making it possible to cool a plurality of chips 1 continuously . with the present embodiment , it is possible as the above describes to provide a multi - chip - module which is provided with the cooling system simple in its structure with a small number of parts and assembling steps without lowering the cooling efficiency . now , taking a module with 100 pieces of chips as an example of comparison , the present embodiment is able to reduce the number of parts for the cooling system to approximately 1 / 10 or less those of the conventional module . subsequently , in accordance with fig6 a second embodiment of the present invention will be described . if a further reduction is desired in the number of parts of the first embodiment , it is possible to dispense with the pipe arrangements 7 and 8 by elongating the straight tube sections 5c and 5d at both ends of the coolant supply pipe 5 as shown in fig6 . however , if the housing 4 is integrally structured , it is impossible to insert the straight tube sections 5c and 5d at both ends of the coolant supply pipe 5 into the catch holes 4b and 4e . therefore , the structure is arranged so that one side 4b of the housing 4 is separated and joined together at the portion 4c subsequent to the insertion of the straight tube sections . in this respect , all others are the same as the first embodiment . as the above describes , although the joining process is needed for the fabrication of the housing 4 , it is possible to dispense with the pipe arrangements 7 and 8 . hence a further reduction of the number of parts can be implemented . further , in accordance with fig9 and fig1 , a third embodiment of the present invention will be described . when the heat generation of the chips 1 is great , the heat conduction to the coolant 11 should be enhanced . therefore , the structure of the first embodiment of the multi - chip - module 50 is arranged so as to allow fins 14 to be joined to the straight tube section 5b of the coolant supply pipe 5 by soldering , brazing , or the like 15 . with this , the thermal conduction area is increased and the cooling efficiency is further enhanced . as the material of the fins 14 , a material having an excellent thermal conductivity such as copper , aluminum , stainless steel or highly thermal conductive sic ceramics can be used . as the above describes , the present embodiment is particularly effective in such a case where the heat generation of the chips is great , necessitating the use of the multi - chip - module which is provided with a cooling system of excellent cooling efficiency . further , in accordance with fig1 and fig1 , a forth embodiment of the present invention will be described . when the heat generation of the chips 1 is great , the thermal conduction to the coolant 11 should be enhanced . therefore , a foam metal block 16 having a wide surface area is joined by soldering , brazing , or the like 15 to the straight tube section 5b of the coolant supply pipe 5 of the first embodiment of the multi - chip - module 50 . with this , the thermal conduction area is significantly increased and the cooling efficiency is further enhanced . as the material of the foam metal block 16 , a material having an excellent thermal conductivity such as copper , aluminum , or stainless steel can be used . also , in place of the foam metal , a honeycomb type metal block or the like may be used . as the above describes , the present embodiment is particularly effective in such a case where the heat generation of the chips is great , necessitating the use of the multi - chip - module which is provided with a cooling system of excellent cooling efficiency . further , in accordance with fig1 - 17 , a fifth embodiment of the present invention will be described . if any camber of the circuit board 3 occurs at the time of fabrication or the joinings between the chips 1 and the terminals are not precise enough , the heights at the upper face level of the chips 1 become more irregular . if such takes place , there may be some cases where it is difficult to join the upper faces of the chips 1 and the straight tube sections 5b of the coolant supply pipe 5 because by the method of the present embodiment the gaps between them become too great . therefore , by arranging the structure of the multi - chip - module so as to allow the straight tube sections 5b of the coolant supply pipe 5 to be pressed against the upper faces of the chips 1 by springs 13 ; thus absorbing the height irregularity at the time of assembly to make the cooling possible . further , by applying thermal conductive grease 12 between the straight tube sections 5b of the coolant supply pipe 5 and the upper faces of the chips 1 , i . e ., the thermal conduction portions , it is possible to increase the cooling efficiency for the chips 1 . as the material of the thermal conductive grease 12 , a mixture of silicon oil and thermal conductive fine powder or the like can be used . the spring 13 is provided for each of the chips 1 , and is formed in such a manner that one end thereof is joined to the spring joint hole 4a of the housing 4 and the other end is joined to a disc 25 . here , the disc 25 is provided to allow the spring force to be applied evenly to the straight tube section 5b of the coolant supply pipe 5 . also , the load exerted by the springs 13 should be less than the value ( an allowable load per terminal x the number of the terminals ) in order to minimize any possible damage to the terminals 2 . now , the assembling method will be described . as shown in fig1 , the disc 25 is joined to the one end of the spring 13 by soldering , brazing , or the like . then , the joint portion 26 of the spring thus formed is joined by soldering , brazing , or the like to the spring joint hole 4a of the housing 4 to which the pipe arrangement 7 has already been connected as shown in fig1 . subsequently , both ends 5c and 5b of the coolant supply pipe 5 are inserted into the connection holes 4b and 4e provided inside the housing 4 and the joinings 10 are performed by soldering , brazing , or the like . here , the connecting position of the coolant supply pipe 5 is such that the joining faces of the straight tube sections 5b of the coolant supply pipe 5 are placed substantially at the same height as the upper faces of the chips 1 after assembly . then , these are set over the circuit board 3 with the chips 1 being fixedly mounted by the terminals 2 thereon . here , if the thermal conductive grease 12 is applied to the upper faces of the chips 1 beforehand , the thermal conduction between the straight tube sections 5b of the coolant supply pipe 5 and the upper faces of the chips 1 is increased to enhance the cooling efficiency . also , a predetermined amount of paste type solder or brazing material is applied to each of the sealing portions 9 . subsequently , in the atmosphere of helium or nitrogen gas or the like , the joinings 6 between the upper faces of the chips 1 and the straight tube sections 5b of the coolant supply pipe 5 and the sealings 9 are performed by soldering , brazing , or the like . at the same time that the multi - chip - module 50 is assembled , helium or nitrogen gas is filled . fig1 is a view showing the assembled multi - chip - module 50 of the present embodiment with partially cut - away housing 4 . as the above describes , with the present embodiment it is possible to provide a multi - chip - module which is provided with the cooling system particularly effective when the irregularity of the heights of the upper faces of the chips 1 is great . further , in accordance with fig1 , a sixth embodiment of the present invention will be described . in the fifth embodiment , if the heat generation of the chips 1 is great , it is necessary to enhance the thermal conduction to the coolant 11 . therefore , in the cooling system for the fifth embodiment of the multi - chip - module 50 , the structure is arranged to allow the fins 14 shown in fig9 to be joined to the straight tube sections 5b of the coolant supply pipe 5 for each of the chips 1 by soldering , brazing , or the like 15 . with this , the thermal conduction area is increased to enhance the cooling efficiency . as a result , with the present embodiment , it is possible to provide a multi - chip - module which is provided with a cooling system capable of maintaining its cooling efficiency even when the irregularity of the heights of the upper faces of the chips 1 is great . further , in accordance with fig1 , a seventh embodiment of the present invention will be described . in the fifth embodiment , if the heat generation by the chips 1 is greater , it is necessary to enhance the thermal conduction to the coolant 11 . therefore , the structure of the cooling system of the forth embodiment of the multi - chip - module 50 is arranged to allow a foam metal block 16 having a large surface area to be joined to the straight tube section 5b of the coolant supply pipe 5 for each of the chips 1 by soldering , brazing , or the like 15 . with this , the thermal conduction area is significantly increased to further enhance the cooling efficiency . therefore , with the present embodiment , it is possible to provide a multi - chip - module which is provided with a cooling system capable of maintaining its cooling efficiency even when the irregularity of the heights of the upper faces of the chips 1 is great . further , in accordance with fig2 and fig2 , an eighth embodiment of the present invention will be described . in the sixth embodiment , if a large number of the chips 1 should be arranged , it is necessary to insert a large number of fins 14 into the straight tube sections 5b of the coolant supply pipe 5 , and the number of the assembling steps becomes great . therefore , the structure is arranged so as to employ one piece of fins 14a which is long in the axial direction as shown in fig2 , and insert such a long type fins in the axial direction of the coolant supply pipe 5 to join them together as shown in fig2 . as a result , with the present embodiment , it is possible to perform the insertion and joining of the fins 14a to the straight tube sections 5b of the coolant supply pipe 5 simply when a large number of the chips 1 are arranged . further , in accordance with fig2 - fig2 , a ninth embodiment of the present invention will be described . in the first embodiment , if it is desired that a plurality of multi - chip - modules 50 be mounted more closely on the printed circuit board 24 with an improved spacing arrangement , the multi - chip - modules 50 cannot be installed at a high density because the pipe arrangements 7 and 8 guiding the flow of the coolant 11 are connected to the sides of the housing 4 and the main pipe arrangements 22 and 23 interfere with each other . therefore , as shown in fig2 , the structure is arranged so as to bend the bellows sections 5e at both ends of the coolant supply pipe 5 almost perpendicular to the axial direction of the coolant supply pipe 5 to connect them to the upper face of the housing 24 for passing the coolant 11 via the pipe arrangements 19 and 20 . furthermore , the structure may employ the pressure contacts by springs as shown in fig2 in the same way as the fifth embodiment . with this , it is possible to make the printed circuit board 24 smaller because the pipe arrangements do not interfere with each other and the multi - chip - modules 50 can thus be installed with better spacing arrangements . hence , with this embodiment , its high density packaging can be implemented to miniaturize the computer as a whole . as the above describes , according to the present invention , it is possible to provide a highly reliable multi - chip - module in a simple structure having a small number of junctions , which is capable of implementing the miniaturization of computers without lowering its cooling efficiency . in other words , the multi - chip - module of the present invention is structured with a cooling system , in which the coolant supply pipe having flexible bellows sections and straight tube sections alternately is arranged in parallel with upper faces of the chips ; thus making it possible for the bellows sections to correct the inclinations of the chips and irregularity of its heights at the time of assembly or the thermal distortion of the chips during operation , and therefore minimize possible damages to the terminal connections . furthermore , because of a simpler structure and a smaller number of parts , it is possible to join the coolant supply pipe to the chips and seal the module as a whole at a time , subsequent to the connection of the coolant supply pipe to the inside of the housing . as a result , a collective assembling is possible to reduce the number of assembling steps significantly . also , it is possible to provide a low , flat type multi - chip - module because the bellows sections are arranged in the horizontal direction . also , the straight tube sections of the coolant supply pipe are joined to the upper faces of the chips by soldering , brazing , or the like or are pressed by springs to be in contact therewith through thermal conductive grease , and by the thermal conductance at these portions , the heat generated by a plurality of chips can be removed continuously by the coolant flowing in one coolant supply pipe . further , with the fins , foam metal block , or the like being provided in the straight tube sections of the coolant supply pipe , the thermal conduction area is significantly increased to make the enhancement of the cooling efficiency possible . also , the structure is arranged so as to bend the bellows sections at both ends of the coolant supply pipe almost perpendicular to the axial direction of the coolant supply pipe and connect them to the upper face of the housing to allow the coolant to flow in and out via the upper face of the housing . with this arrangement , it is possible to implement a high - density packaging because the pipe arrangements do not interfere with each other when a plurality of multi - chip - modules are closely installed on a printed circuit board and attain the miniaturization of a computer as a whole .