Patent Publication Number: US-2005143659-A1

Title: Ultrasonic endoscope and ultrasonic signal cable connector device

Description:
This application claims benefit of Japanese Application No. 2003-435620 filed on Dec. 26, 2003, the contents of which are incorporated by this reference.  
     BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      The present invention relates to an ultrasonic endoscope having an ultrasonic connector that connects to ultrasonic measuring equipment and observes the body cavity using ultrasonic wave, and to an ultrasonic signal cable connector device.  
      2. Description of the Related Art  
      Various types of endoscopes are widely used in the medical field, which are inserted into the body cavity to observe the living-body tissue or perform biopsy or treatment.  
      One type of such endoscopes is the ultrasonic endoscope. This ultrasonic endoscope has an ultrasonic transducer on the distal end of the insertion portion that is to be inserted in the body cavity. The ultrasonic transducer of this ultrasonic endoscope transmits ultrasonic wave to the living-body tissue, and receives the ultrasonic wave reflected from the living-body tissue. Thus, an ultrasonic tomographic image is generated by the various observation equipment connected to the ultrasonic endoscope, and the living-body tissue can be observed.  
      This ultrasonic endoscope is provided on the proximal end portion of the ultrasonic signal cable, as described in Japanese Patent Application Publication No. 2000-139927 for example, and has an ultrasonic connector that connects to an ultrasonic measuring equipment. This ultrasonic connector is provided with, for example, four Flexible Printed Circuits (hereafter “FPC”). The four FPCs each are connected to one end of each of multiple groups of signal lines. Further, the other end of each group of the multiple signal lines is connected to piezoelectric elements making up an electronic scanning ultrasonic transducer.  
      The FPCs and the multiple signal lines divided into groups are connected by the signal lines being soldered to contact pads provided on the FPCs.  
      Further, an FPC extension connecting pad is made for connecting an extension FPC. One end of this extension FPC can be inserted into the FPC connector of the ultrasonic connector and fixed. This FPC and the extension FPC are connected by the extension FPC connecting pad provided on the FPC being soldered to the pad provided on the extension FPC.  
      Further, the multiple signal lines extending from the ultrasonic transducer of the ultrasonic endoscope are divided into multiple groups, with an FPC disposed for each group.  
      A relatively large number, more than several dozen, of the above-described signals lines are built in, although this depends upon the number of piezoelectric elements. Therefore, the ultrasonic signal cable can have a narrower external diameter, the width of the multiple piezoelectric elements can be set narrow, and the electric connecting unit of the signal lines can also be set narrow, resulting in the much narrower diameter of the signal lines, as illustrated in the drawings of Japanese Patent Application Publication No. 2000-139927.  
      Further, the dimensions of the FPCs connected with the ultrasonic signal cable need to be smaller in diameter than that of the ultrasonic signal cable channel, in order to pass through the ultrasonic signal cable channel which has a small diameter, that is positioned in the insertion unit and so forth.  
      Therefore, the land width and the land spacing of the contact pad provided on the FPC is made to be very small. Accordingly, the assembly worker needs to have a high degree of skill for soldering the extremely fine signal lines to the contact pad for electric connection.  
      On the other hand, the FPC connector width and the FPC connector spacing of the multiple FPC connectors provided on the connecting connector of the ultrasonic connector are set relatively wide. Thus, the multiple FPC connectors are arranged so as to avoid contact failure. This ultrasonic connector has an extension FPC for ease of attaching to the connecting connector, and the extension FPC has a contact pad wherein the pad width and pad spacing is set so as to correspond to the FPC connector.  
     SUMMARY OF THE INVENTION  
      According to the present invention, an ultrasonic signal cable connector device, to be used with an ultrasonic endoscope comprising an ultrasonic transducer provided on a distal end of the insertion portion to be inserted in the body cavity for sending ultrasonic wave to the tissue of the body cavity and receiving the ultrasonic wave reflected from the body cavity tissue so as to generate an ultrasonic signal, an ultrasonic signal cable having a plurality of signal lines each connected to a plurality of piezoelectric elements making up the ultrasonic transducer, and an ultrasonic connector connected to the ultrasonic signal cable to the ultrasonic measuring equipment, comprises: a flexible wiring board in an approximate L-shape wherein the wiring pattern is formed for connecting the plurality of signal lines of the ultrasonic signal cable to the ultrasonic connector; a first hard board portion wherein a plurality of wiring lands for connecting the plurality of signal lines of the ultrasonic signal cable to the wiring pattern are formed on the one face of the flexible wiring board, and the portion where the wiring lands are formed is hardened; and a second hard board portion wherein a plurality of connecting connector lands for connecting the ultrasonic connector to the wiring pattern are formed on the other face of the flexible wiring board, wherein the portion where the connecting connector lands are formed is hardened; wherein the L-shaped flexible wiring board is capable of changing shape to face the first hard board portion and the second hard board portion when viewed from the insertion direction.  
      The above and other objects, features and advantages of the invention will become more clearly understood from the following description referring to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       FIG. 1  is a description diagram illustrating the configuration of an ultrasonic endoscope according to a first embodiment of the present invention;  
       FIG. 2  is a cross-sectional diagram illustrating the configuration of an ultrasonic connector according to the first embodiment of the present invention;  
       FIG. 3  is a plan view illustrating the configuration of an ultrasonic signal cable according to the first embodiment of the present invention;  
       FIG. 4  is a plan view illustrating the configuration of an ultrasonic signal cable connector device according to the first embodiment of the present invention;  
       FIG. 5  is a side view illustrating the configuration of an ultrasonic signal cable connector device according to the first embodiment of the present invention;  
       FIG. 6  is a side view illustrating the insertion method of the ultrasonic signal cable connector device into the ultrasonic signal cable channel according to the first embodiment relating to the present invention;  
       FIG. 7  is a plan view illustrating the configuration of an ultrasonic signal cable connector device according to a second embodiment of the present invention;  
       FIG. 8  is a side view illustrating the configuration of an ultrasonic signal cable connector device according to the second embodiment of the present invention;  
       FIG. 9  is a side view illustrating the insertion method of the ultrasonic signal cable connector device into the ultrasonic signal cable channel according to the second embodiment relating to the present invention.  
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
     First Embodiment  
      The configuration of the ultrasonic endoscope of the present invention will be described below based on the diagram, with reference to  FIG. 1 . An ultrasonic endoscope  51  primarily comprises an insertion portion  52  that is inserted into the body cavity, an operating unit  53  provided on the rear end of the insertion portion  52 , an eyepiece  54  provided on the proximal end of the operating unit  53 , a universal cord  55  extending from the operating unit  53 , an endoscope connector  56  provided on the proximal end of the universal cord  55  that is connected to a light source device (not shown), and an ultrasonic signal cable  57  that extends from the endoscope connector  56  and has an ultrasonic connector  58  on the distal end thereof. Now, the ultrasonic connector  58  which is this connector unit is connected to an ultrasonic measuring equipment (not shown).  
      The insertion portion  52  is formed with a small diameter. The insertion portion  52  comprises, in order from the distal end, a hard distal-end portion  59 , a bending portion  60 , and a long flexible portion  61  that is capable of bending. An ultrasonic transducer unit  63  is located on the distal end side of the hard distal-end portion  59 . An electronic scanning ultrasonic transducer, wherein multiple piezoelectric elements that send and receive ultrasonic wave are arrayed, is located on the ultrasonic transducer unit  63 .  
      Disposed on the operating unit  53  are a bending knob  62 , an air and water feed button, a suction button, an insertion opening for forceps treatment instruments, and so forth.  
      The bending knob  62  is an operating knob for bending the bending portion  60  of the insertion portion  52  in the desired direction. The air and water feed button is operated in the moment wherein air or water is fed to the air and water feeding channel provided within the insertion portion  52 . The suction button is operated in the moment wherein air or water is suctioned into the suction channel. The insertion opening for forceps treatment instruments is an opening for the forceps channel through which forceps treatment instruments are inserted.  
      The optical image of the internal body cavity from the object lens provided on the hard distal-end portion  59  of the insertion portion  52  is guided by the image guide, and visually confirmed at the eyepiece  54 .  
      The illumination light from the light source device wherein the endoscope connector  56  is connected is guided through the universal cord  55 , and a light guide that is passed through the inside of the operating unit  53  and the insertion portion  52 . Then the illumination light is emitted from the hard distal-end portion  59  onto the observation portions of the body cavity. The ultrasonic signal cable  57  that extends from the endoscope connector  56  is passed through the universal cord  55 , and the ultrasonic signal cable channel (not shown) provided on the insertion portion  52  and the operating unit  53 . One end of the ultrasonic signal cable  57  is connected to the electronic scanning ultrasonic transducer of the ultrasonic transducer unit  63 , and the other end thereof is connected to the ultrasonic connector  58 . The ultrasonic connector  58  is connected to the ultrasonic measuring equipment (not shown) that performs sending/receiving drive control of the ultrasonic wave from the electronic scanning ultrasonic transducer of ultrasonic transducer unit  63 .  
      Further, the ultrasonic signal cable  57  is connected to the multiple piezoelectric elements of the electronic scanning ultrasonic transducer provided in the ultrasonic transducer unit  63 . Multiple signal lines which are signal core lines, to be described below, that send/receive the ultrasonic signal from the piezoelectric elements, pass through the inside of the ultrasonic signal cable  57 . These multiple signal lines are grouped according to a unit with a predetermined number of lines.  
      The one end sides of the multiple signal lines in the ultrasonic signal cable  57  are connected electrically to the multiple piezoelectric elements of the electronic scanning ultrasonic transducer provided on the ultrasonic transducer unit  63 . The multiple signal lines are separated into multiple bundles as will be described below, and are inserted in the ultrasonic signal cable channel opening provided on the hard distal-end portion  59  of the insertion portion  52  from the other end side that is not connected with the piezoelectric elements. The ultrasonic signal cable  57  passes through the ultrasonic signal cable channel and is connected to the ultrasonic connector  58 . Now, the ultrasonic signal cable channel is an insertion hole that is located within the bending portion  60  of the insertion portion  52 , the flexible portion  61 , the operating unit  53 , the universal cord  55 , and the endoscope connector  56 .  
      An ultrasonic signal cable connector device to be described below is provided on the distal end of the signal lines of each ultrasonic signal cable  57  for each group wherein the signal lines were grouped together. This ultrasonic signal cable connector device is connected to the connecting connector  92  (see  FIG. 2 ) of the ultrasonic connector  58 .  
      Next, the configuration of the ultrasonic connector  58  will be described, with reference to  FIG. 2 .  FIG. 2  is a cross-sectional diagram of an ultrasonic connector.  
      The ultrasonic connector  58  mainly comprises a metal frame  96  in an approximately rectangular box shape, a cable insertion hole  90 , multiple connecting connectors  92 , four to be specific, an insulating sheet  93 , multiple matching boards  91 , two to be specific, a base board  94 , a metal board  97 , and a connector unit  98 . The cable insertion hole  90  is an insertion hole for inserting the ultrasonic signal cable  57  into the metal frame  96 . Multiple ultrasonic signal cable connector devices to be described below, which are provided on the distal end of the ultrasonic signal cable  57  that is inserted from the cable insertion hole  90 , are attached to the connecting connectors  92 . The ultrasonic signal cable connector devices are each attached to the connecting connectors  92 , and in the moment wherein they are connected, the insulating sheet  93  is provided between the metal frame  96  and the ultrasonic signal cable connector device. In other words, the insulating sheet  93  insulates the connecting connectors  92  and the ultrasonic signal cable connector device in the moment that the ultrasonic signal cable connector device is attached and connected to the connecting connector  92 . The matching boards  91  are electrically connected to the multiple connecting connectors  92 . The matching boards  91  are boards on which matching circuits are formed. The matching circuits perform the matching between the ultrasonic measuring equipment and the electronic scanning ultrasonic transducer that is connected to the ultrasonic signal cable  57 . The base board  94  is connected to the multiple matching boards  91 . Further, the base board  94  has multiple connector pins for the purpose of connecting to the ultrasonic measuring equipment. The metal board  97  covers the area of the connector pin of the base board  94 , and is fixed to the metal frame  96 . In the moment that the ultrasonic connector  58  is connected to the ultrasonic measuring equipment, the connector unit  98  sets the metal frame  96  and the metal board  97  at the same electric potential as the reference potential of the ultrasonic measuring equipment.  
      The configuration of the ultrasonic signal cable  57  that is connected to the ultrasonic connector  58  will be described with reference to  FIG. 3 . The ultrasonic signal cable  57  comprises an overall insulator covering  77 , multiple coaxial lines  75   a  through  75   d , and an overall shield  76  that bundles the coaxial lines  75   a  through  75   d . Multiple signal core lines  71  are located within the coaxial lines  75   a  through  75   d.    
      The multiple signal core lines  71  are each covered with an insulator layer  72 . A shield  73  surrounds each of the insulator layers  72 . An insulator covering layer  74  surrounds and covers the shields  73 . In other words, inside of the coaxial lines  75   a  through  75   d , the signal core lines  71  that are covered by the insulator layer  72 , the shield  73  and the insulator covering layer  74  are grouped together with several lines in a unit.  
      On the distal ends of the multiple coaxial lines  75   a  through  75   d , ultrasonic signal cable connector devices  10   a  through  10   d  that are connecting boards are each connected (hereafter, may on occasion be individually or collectively referred to as “ultrasonic signal cable connector device  10 ”). The ultrasonic signal cable connector devices  10   a  through  10   d  are connected, in order, along the length of the ultrasonic signal cable  57  on the distal ends of the coaxial lines  75   a  through  75   d , each set apart only the length L of the ultrasonic signal cable connector device  10 . In other words, the ultrasonic signal cable connector devices  10   a  through  10   d  are located in a perpendicular direction to the length of the ultrasonic signal cable  57 , so as not to overlap the others.  
      The ultrasonic signal cable connector device will be described below with reference to  FIGS. 4 through 6 .  FIG. 4  is a plan view illustrating the configuration of an ultrasonic signal cable connector device,  FIG. 5  is a side view illustrating the configuration of an ultrasonic signal cable connector device, and  FIG. 6  is a diagram illustrating an insertion method of inserting the ultrasonic signal cable connector device that is connected to the ultrasonic signal cable to the ultrasonic signal cable channel of the cable connector.  
      As illustrated in  FIG. 4 , the ultrasonic signal cable connector device (hereafter referred to as “cable connector”)  10  has a flexible board  11  formed as one unit in an approximate L-shape. A connecting land and a circuit pattern are formed on the surface of the insulating base board of the flexible board  11 .  
      On the surface of one edge of the L-shaped flexible board  11  is provided with multiple signal core line wiring lands  15   a  through  15   n  and grounding land  16 , with equal spacing between. The wiring patterns  17   a  through  17   n  provided with equal spacing along the surface shape of the flexible board  11 , and the grounding pattern  18 , extend out from the signal core line wiring lands  15   a  through  15   n  and the grounding land  16 .  
      Further, the signal core lines  71  of the coaxial lines  75   a  through  75   d  of the ultrasonic signal cable  57  are electrically connected by soldering to the multiple signal core line wiring lands  15   a  through  15   n . The grounding land  16  is electrically connected by soldering to the shields  73  provided on the signal core lines  71 .  
      On the surface of the other edge of the L-shaped flexible board  11  are provided with multiple connector connecting lands  19   a  through  19   n  and one connector connecting land  20 , with equal spacing between. The other edge portion of the flexible board  11  wherein the connector connecting lands  19   a  through  19   n  and the connector connecting land  20  are provided is attached to the connecting connector  92  (see  FIG. 2 ) of the ultrasonic connector  58 . Thus, the flexible board  11  is electrically connected with the matching board  91 . In this state, the connector connecting lands  19   a  through  19   n  are electrically connected to the wiring patterns  17   a  through  18   n . Further, the connector connecting land  20  becomes connected with the grounding pattern  18 .  
      The portion of the flexible board  11  wherein the signal core line lands  15   a  through  15   n  and the grounding land  16  are provided has a smaller dimension in the width direction (hereafter may be referred to as “length”) L1 that is smaller than the internal diameter of the ultrasonic signal cable channel of the ultrasonic endoscope  51 . Therefore, the land width of the signal core line lands  15   a  through  15   n  are approximately the same width as the diameter of the signal core line  71  of the ultrasonic signal cable  57 . Now, the spacing of the signal core line lands  15   a  through  15   n  is set to be the dimensions of the spacing wherein the predetermined number of signal core lines  71  can be connected in the width direction L1.  
      Further, regarding the length of the flexible board  11  provided with the connector wiring lands  19   a  through  19   n  and the connector grounding land  20 , the length L2 in the inserting direction to the connecting connector  92  of the ultrasonic connector  58  is approximately the same length as the length L1 of the flexible board  11  (L1=L2), and is set to be less than the internal diameter of the ultrasonic signal cable channel.  
      The back face side of the flexible board  11  provided with the signal core line lands  15   a  through  15   n  and the ground land  16  has a first hard board portion  12  formed by adhering a hard member  22 , as illustrated in  FIG. 5 . Further, on the back face of the flexible substrate  11  where the connector wiring lands  19   a  through  19   n  and the connector grounding land  20  are provided, a second hard board portion  13  is formed by adhering a hard member  23 . The length L1 of the width dimension of the first hard board portion  12  and the length L2 of the width dimension of the second hard board portion  13  are formed to be approximately the equal length (L1=L2) that is less than the internal diameter of the ultrasonic signal cable channel. Further, the length L3 of the length dimension of the flexible board  11  from the first hard board portion  12  to the second hard board portion  13  is less than the internal diameter of the ultrasonic signal cable channel, and is equal to the length L1 of the width dimension of the first hard board portion  12  and the length dimension L2 of the second hard board portion  13 , or is less than that (L1=L2&gt;L3).  
      In other words, the L-shaped flexible board  11  has a first hard board portion  12  and a second hard board portion  13 , wherein the first hard board portion  12  and the second hard board portion  13  are difficult to bend and deform. Therefore, the flexible board  11  has a soft board portion  14  that retains flexibility, in addition to having the first hard board portion  12  and the second hard board portion  13 .  
      The signal core line lands  15   a  through  15   n  provided on the first hard board portion  12  are electrically connected to the signal core lines  71  of the ultrasonic signal cable  58  by using soldering devices for fine signal lines. Further, the grounding land  16  provided on the first hard board portion  12  is electrically connected to the shield  73  of the signal core line  71  by using soldering devices for fine signal lines.  
      Next, a method for inserting the ultrasonic signal cable  57  that is connected to the cable connector  10  from the hard distal-end portion  59  of the ultrasonic endoscope  51  through to the ultrasonic signal cable channel provided on the insertion portion  52 , the operating unit  53 , and universal cord  55 , and the endoscope connector  56  will be described with reference to  FIG. 6 .  
      When viewed from the insertion direction, the cable connector  10  is bent in an approximately U-shape from the soft board portion  14  so that the face provided with the signal core line lands  15   a  through  15   n  and the grounding land  16  of the first hard board portion  12  and the face provided with the connector connecting lands  19   a  through  19   n  and the connector grounding land  20  of the second hard board portion  13  are facing each other.  
      As described above, the cable connector  10  is bent into a U-shape, and the assembly worker inserts this into the ultrasonic signal cable channel  25 . At this time, the assembly worker can easily pass the article through the ultrasonic signal cable channel  25  because the first and second hard board portions  12  and  13  are each formed less than the internal diameter of the ultrasonic signal cable channel  25 . Now, in order to maintain the U-shape of the cable connector  10 , the assembly worker may, for example, place a cap of a cylindrical tube or wrap cellophane tape around and pass it through into the ultrasonic signal cable channel  25 .  
      Thus, the cable connector  10  at the distal end of the ultrasonic signal cable  57  that is passed through to the ultrasonic signal cable channel  25  is inserted from the cable insertion hole  90  on the ultrasonic connector  58 . Then, after the assembly worker has removed the cylindrical tube or cellophane tape that is maintaining the U-shaped bend of the cable connector  10 , the second hard board portion  23  is attached to the connecting connector  92 .  
      As described above, before the assembly worker inserts the ultrasonic signal cable  57  into the ultrasonic signal cable channel  25 , the signal core line lands  15   a  through  15   n  and the grounding land  16  provided on the first hard board  12  of the cable connector  10  can be electrically connected to the signal core line  71  and the shield  73  of the ultrasonic signal cable  57 . Accordingly, the assembly worker can perform the soldering operation for electrical connection with no obstructing structures. Therefore, since the soldering connecting work of the ultrasonic signal cable  57  and the cable connector  10  has no workspace limitation, the process becomes relatively simple. Further, the cable connector  10  is formed in an L-shape, and is formed as one unit with the second hard board portion  13  that is attached to the connecting connector  92  of the ultrasonic connector  58 . Therefore, the soldering work within the ultrasonic connector  58  becomes unnecessary, and the L-shaped portion is less likely to tear even if external pressure is placed thereon.  
     Second Embodiment  
      Next, the second embodiment of the ultrasonic signal cable connector device for an ultrasonic endoscope of the present invention will be described with reference to  FIGS. 7 through 9 .  FIG. 7  is a plan view illustrating the configuration of cable connector used for an ultrasonic signal cable that is the second embodiment of the ultrasonic signal cable connector device relating to the present invention,  FIG. 8  is a side view thereof, and  FIG. 9  is a side view illustrating the insertion method of the cable connector used as an ultrasonic signal cable into the ultrasonic signal cable channel that is the second embodiment of the ultrasonic signal cable connector device relating to the present invention. Now, components which are the same as those of the ultrasonic signal cable connector device illustrated in  FIGS. 4 and 5  will be denoted with the same reference numerals, and description thereof will be omitted.  
      The cable connector  10 ′ of the second embodiment has the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16 ′ on one edge of both the front face and the back face of the L-shaped flexible board  11 ′. From the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16 ′ of the two faces front and back, the wiring pattern  17 ′ a ,  17 ′ b  and so on and grounding pattern  18 ′ is extended in the lengthwise direction. Further, the through holes  24   a ,  24   b , and so on, are provided on the L-shape form of the flexible board  11  where the shape changes. The wiring pattern  17 ′ a ,  17 ′ b , and so on, and the grounding pattern  18 ′ provided on the back face of the flexible board  11  are drawn through to the front face side via the through holes  24   a ,  24   b , and so on.  
      On the front face of the other edge of the flexible board  11 , the connector connecting lands  19 ′ a  through  19 ′ n  for attaching to the connecting connector  92  of the ultrasonic connector  58 , and the connector grounding land  20 ′ are provided. The connector connecting lands  19 ′ a  through  19 ′ n  and the aforementioned connector grounding lands  20 ′ are connected to the wiring patterns  17 ′ a ,  17 ′ b , and so on, and the through holes  24   a ,  24   b , and so on.  
      In other words, the one edge of the flexible board  11  has a certain amount of strength because the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16 ′, are each provided on the front and back faces thereof. Further, the strength of the one edge of the flexible board  11  is increased because the signal core lines  71  and the shields  73  of the ultrasonic signal cable  57  are soldered and connected with the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16 ′. Therefore, the first hard board portion  12 ′ can be formed on the flexible board  11  without adhering the hard member  22  (see  FIG. 5 ) as described in the first embodiment.  
      Further, in the case that the number of the signal core lines  71  of the ultrasonic signal cable  57  that connects to the cable connector  10 ′ is the same as the above-described first embodiment, by providing the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16 ′, on both the front and back faces of the first hard board portion  12 ′, the length L1′ of the width direction measurement of the first hard board portion  12 ′ becomes about half of that of the length L1 of the first hard board  12  of the first embodiment (L1′=L½).  
      Further, the wiring patterns  17 ′ a ,  17 ′ b , and so on, and the grounding pattern  18 ′ from the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16  on both the front and back of the first hard board portion  12 ′ are extended straight out in the lengthwise direction of the first hard board portion  12 ′. Further, within the portion of the L-shape that change shape on the flexible board  11 ′, the wiring patterns  17 ′ a ,  17 ′ b , and so on, and the grounding pattern  18 ′ on the back face side are drawn out to the front face side by the through holes  24   a ,  24   b , and so on. Also, all of the wiring patterns  17 ′ a ,  17 ′ b , and so on, and the grounding pattern  18 ′ extend straight out to the front face of the flexible board  11 ′ towards the second hard board portion  13 ′ wherein the hard member  23 ′ is adhered similar to the above-described first embodiment. The extended edges of all of the wiring patterns  17 ′ a ,  17 ′ b , and so on and the grounding pattern  18 ′ are connected to the connector connecting lands  19 ′ a  through  19 ′ n  and the connector grounding land  20 . As a result, the lengthwise measurement and the width dimension of the second hard unit  13 ′ can be made to match the measurements of the connecting connector  92  of the aforementioned ultrasonic connector  58  similar to the above-described first embodiment.  
      Thus, the first hard board portion  12  is formed on the cable connector  10 ′ by soldering and connecting the signal core line lands  15 ′ a  through  15 ′ n  and the grounding land  16 ′ provided on the front and back faces of the L-shaped flexible board  11 ′ with the signal core lines  71  and the shields  73  of the ultrasonic signal cable  57 . Further, the second hard board portion  13 ′ wherein the hard member  23  is adhered to the back face formed with the connector connecting lands  19 ′ a  through  19 ′ n  and the connector grounding land  20 ′ is formed on the cable connector  10 ′. Therefore, the first hard board portion  12 ′ and the second hard board portion  13 ′ of the cable connector  10 ′ do not readily bend. In other words, the flexible board  11  has a flexible board  14  that retains the flexibility other than the first hard board  12  and the second hard board  13 .  
      The signal core line lands  15 ′ a ,  15 ′ b , and so on, provided on both the front and back faces of the first hard board portion  12 ′ on the cable connector  10 ′ are electrically connected with the signal core lines  71  of the ultrasonic signal cable  58 , by using a soldering device for fine signal lines. Further, the grounding land  16 ′ is electrically connected with shields  73  of the signal core lines  71  by using a soldering device for fine signal lines.  
      Next, a method for inserting the ultrasonic signal cable  57  that is connected to the cable connector  10 ′ from the hard distal-end portion  59  of the ultrasonic endoscope  51  through to the ultrasonic signal cable channel provided on the insertion portion  52 , the operating unit  53 , and universal cord  55 , and the endoscope connector  56  will be described with reference to  FIG. 9 .  
      As illustrated in  FIG. 9 , when viewed from the insertion direction, the cable connector  10 ′, which is electrically connected with the distal end of the ultrasonic signal cable  57 , is bent in an approximate U-shape at the soft board portion  14 ′ so that the face provided with the signal core line lands  15 ′ a ,  15 ′ b , and so on, and the grounding land  16 , of the first hard board portion  12 ′ and the face provided with the connector connecting lands  19 ′ a  through  19 ′ n  and the connector grounding land  20 ′ of the second hard board portion  13 ′ are facing each other.  
      The cable connector  10 ′ is bent into a U-shape, and the assembly worker inserts this into the ultrasonic signal cable channel  25 . At this time, the assembly worker can easily pass it through the ultrasonic signal cable channel  25  because the first and second hard board portions  12 ′ and  13 ′ are each set to be less than the internal diameter of the ultrasonic signal cable channel  25 . Now, in order to maintain the U-shape of the cable connector  10 ′, the assembly worker may, for example, place a cap of a cylindrical tube or wrap cellophane tape around and pass it through into the ultrasonic signal cable channel  25 .  
      Thus, the cable connector  10 ′ at the distal end of the ultrasonic signal cable  57  that is passed through to the ultrasonic signal cable channel  25  is inserted from the cable insertion hole  90  on the ultrasonic connector  58 . Then, after the assembly worker has removed the cylindrical tube or cellophane tape that is maintaining the U-shaped bend of the cable connector  10 ′, the second hard board portion  23 ′ is attached to the connecting connector  92 .  
      According to the second embodiment, the width dimension L1′ of the first hard board portion  12 ′ can be set to approximately half (L1′=L½) of the width dimension L1 of the first hard board portion  12  according to the first embodiment, and therefore the length dimension L2′ of the second hard board portion  13 ′ can be a value relatively close to the diameter of the ultrasonic signal cable channel  25 .  
      Further, the wiring pattern  17 ′ a  through  17 ′ n  and the grounding pattern  18 ′ and the through holes  24   a ,  24   b , and so on that extend directly from both the front and back face of the first hard board  12 ′ can have the hard member adhered to and the third hard board portion  14 ′ a  formed on either the front or back face of a portion that forms the L-shaped portion. By forming the third hard board portion  14 ′ a , the through holes  24   a ,  24   b , and so on are protected from stress due to the bending and changing shape. Now, a flexible board portion  14 ′ b  is formed that maintains the flexibility of the flexible board  11 ′, on the flexible board  11 ′, other than where the first hard board portion  12 ′, the second hard board portion  13 ′, and the third hard board portion  14 ′ a  are formed.  
      As described above, before the assembly worker inserts the ultrasonic signal cable  57  into the ultrasonic signal cable channel  25 , the signal core line lands  15 ′ a  through  15 ′ n  and the grounding land  16 ′ provided on the first hard board  12  of the cable connector  10 ′ can be electrically connected to the signal core line  71  and the shield  73  of the ultrasonic signal cable  57 . Therefore, the assembly worker can perform the soldering operation for electrical connection with no obstructing structures. Therefore, since the soldering connecting work of the ultrasonic signal cable  57  and the cable connector  10 ′ has no limitation in the connecting specialized equipment or work environment, the process becomes relatively simple. Further, the cable connector  10 ′ is formed in an L-shape, and is formed as one unit with the second hard board portion  13  that is attached to the connecting connector  92  of the ultrasonic connector  58 . Therefore, the soldering work within the ultrasonic connector  58  becomes unnecessary, and the L-shaped portion of the cable connector  10 ′ becomes more resistant to breakage pressure.  
      Having described the preferred embodiments of the invention referring to the accompanying drawings, it should be understood that the present invention is not limited to those precise embodiments and various changes and modifications hereof could be made by one skilled in the art without departing from the spirit or scope of the invention as defined in the appended claims.