JP4377823B2 - Electronic radial ultrasonic transducer - Google Patents

Description

  The present invention relates to an ultrasonic endoscope using an electronic radial type ultrasonic transducer.

  The electronic radial ultrasonic endoscope uses a plurality of piezoelectric elements (piezoelectric elements are provided in the outer peripheral direction of the insertion portion) provided at the distal end of the insertion portion of the endoscope to electrically transmit the ultrasonic beam. It is an endoscope that scans in a row. More specifically, an ultrasonic image can be acquired by transmitting and receiving an ultrasonic beam in a direction perpendicular to the insertion direction of the endoscope.

It is known that by using such an ultrasonic endoscope and an optical endoscope in combination, an ultrasonic image and an optical image can be associated with each other, so that diagnosis can be facilitated. .
On the other hand, it is known that a printed wiring board is used to connect a piezoelectric element of an electronic radial ultrasonic endoscope in order to facilitate wiring with a cable.

  Regarding a printed wiring board electrically connected to piezoelectric elements arranged in a donut shape, a donut-shaped substrate having a signal pattern electrically connected to the piezoelectric element, and a signal pattern corresponding to each signal pattern electrically The technique of the printed wiring board to connect is disclosed (for example, patent document 1).

In addition, the piezoelectric element of the electronic radial ultrasonic endoscope is configured such that the reference piezoelectric element is positioned at a specific position in order to associate the optical image and the ultrasonic image, and then the inside of the hard end portion of the endoscope. Built in.
JP-A-8-172695

  However, in the ultrasonic probe described in Patent Document 1, when the conduction check is performed using the probe for confirming the conduction on the base pattern electrically connected to the donut-shaped base, the pad pitch is narrow. However, there is a problem that it is difficult to confirm continuity. That is, in order to make the diameter of the insertion part of the ultrasonic probe as thin as possible, the pitch of the pads becomes narrow as a result of reducing the radial size of the doughnut-shaped base.

  For this reason, when confirming conduction, it is necessary to use a probe for confirming conduction with a sharp tip. As a result, even if the continuity can be confirmed, the pad or the connecting portion between the pad and the cable is damaged, and there is a possibility that the continuity cannot be finally secured.

  Further, in the ultrasonic probe described in Patent Document 1, when a donut-shaped substrate and a piezoelectric element are electrically connected by wire bonding, there is no mark serving as a reference at the time of electrical connection. There was a possibility of causing.

  On the other hand, when assembling an endoscope by positioning a reference piezoelectric element at a specific position in order to associate an optical image with an ultrasonic image, the reference piezoelectric element is mistaken for another piezoelectric element. Things happen. As a result, there is a problem that a shift occurs in the correspondence between the optical image and the ultrasonic image.

  In view of the above problems, the present invention provides an electronic radial ultrasonic transducer that does not damage a pad or a connection portion of a pad and a cable when conduction is confirmed using a probe for conduction confirmation. In addition, electrical radials using printed wiring that does not cause connection errors when electrically connecting the pads of the printed wiring board to which the cables are connected and the piezoelectric elements, and that does not cause a shift between the optical image and the ultrasonic image. An electronic radial ultrasonic transducer is provided.

  According to the first aspect of the present invention, the piezoelectric element for transmitting and receiving ultrasonic waves is arranged in a plurality of cylindrical shapes, and the drive signal for driving each piezoelectric element is transmitted. A cable corresponding to each piezoelectric element is stored in a cylindrical body formed by the piezoelectric element, and an electrode pad for electrically connecting the cable and the piezoelectric element is formed on the printed wiring board. The center of the planar direction is provided with a hole through which the cable passes, and the printed wiring board is an electronic radial ultrasonic transducer provided in the cylindrical body, and the electrode pad is formed on the printed wiring board. This can be achieved by providing an electronic radial ultrasonic transducer that is formed radially on the upper surface and exposed to the outer peripheral surface of the printed wiring board.

  According to the second aspect of the present invention, the object is to form a groove in a short direction of the outer peripheral surface of a portion of the outer peripheral surface of the printed wiring board that contacts the electrode pad. This can be achieved by providing the electronic radial ultrasonic transducer according to claim 1.

  According to a third aspect of the present invention, at least one of the plurality of electrode pads is different in shape or size from an electrode pad other than the electrode pad. This can be achieved by providing the electronic radial ultrasonic transducer according to claim 1.

  According to the fourth aspect of the present invention, the cylindrical body is provided with notches in the printed wiring board on both sides of at least one of the plurality of electrode pads. 2. The electronic radial according to claim 1, wherein a guide member is provided for guiding the printed wiring board along the notch in order to install the printed wiring board at a predetermined position inside. 3. This can be achieved by providing a type ultrasonic transducer.

  According to the invention described in claim 5, the above-described problem is obtained by electrically connecting a predetermined piezoelectric element to the upper surface or the side surface of the printed wiring board or the side surface of the support member that supports the printed wiring board. It can achieve by providing the electronic radial type ultrasonic transducer according to claim 1, wherein a marking for identifying the electrode pad to be connected is provided.

  According to the invention described in claim 6 of the scope of the invention, an ultrasonic endoscope including the electronic radial ultrasonic transducer according to any one of claims 1 to 5 is provided. Can be achieved.

  By using the present invention, when the continuity is confirmed using the continuity confirmation probe, the pad and the connection portion between the pad and the cable are not damaged. Further, it is possible to prevent a connection error from occurring when electrically connecting the pad of the printed wiring board to which the cable is connected and the piezoelectric element. Further, it is possible to prevent the optical image and the ultrasonic image from being shifted.

  An electronic radial ultrasonic endoscope according to the present invention is an electronic radial ultrasonic endoscope using a printed wiring board having a plurality of pads electrically connected to piezoelectric elements arranged in an arc shape. Board pads were provided at least up to the outer surface of the printed wiring board.

  An electronic radial ultrasonic endoscope according to the present invention is an electronic radial ultrasonic endoscope having a printed wiring board or a structure adjacent to the printed wiring board, and includes a plurality of pads provided on the printed wiring board. Among them, at least one pad having a different shape and size was provided.

  Furthermore, the electronic radial ultrasonic endoscope according to the present invention is the above-mentioned electronic device that is electrically connected to a reference piezoelectric element on the upper surface or side surface of the printed wiring board or the side surface of the structure adjacent to the printed wiring board. Marking was applied in the immediate vicinity of the pad on the printed wiring board.

  FIG. 1 shows an external configuration of an ultrasonic endoscope according to the present invention. The ultrasonic endoscope 1 includes an elongated insertion portion 2 that is inserted into a body cavity, an operation portion 3 that is located at the proximal end of the insertion portion 2, and a universal cord 4 that extends from a side portion of the operation portion 3. And is mainly composed.

  An endoscope connector 4 a connected to a light source device (not shown) is provided at the base end portion of the universal cord 4. The endoscope connector 4a is detachably connected to a camera control unit (not shown) via an electrical connector 5a and detachably connected to an ultrasound observation device (not shown) via an ultrasonic connector 6a. An ultrasonic cable 6 extends.

  The insertion portion 2 is located at the distal end of the bending portion 8, the bending portion 8, which is formed at the rear end of the distal end rigid portion 7, and the bending end 8. A flexible tube portion 9 having a small diameter, a long length and flexibility reaching the distal end portion of the operation portion 3 is continuously provided. An ultrasonic transducer section 10 in which a plurality of piezoelectric elements that transmit and receive ultrasonic waves are arranged is provided on the distal end side of the distal end hard section 7.

  The operation unit 3 includes an angle knob 11 for controlling the bending of the bending portion 8 in a desired direction, an air / water supply button 12 for performing air supply and water supply operations, a suction button 13 for performing suction operations, and a body cavity. A treatment instrument insertion port 14 or the like serving as an entrance of a treatment instrument to be introduced is provided.

  FIG. 2 is an enlarged view of the insertion portion distal end 16 of the ultrasonic endoscope 1 shown in FIG. FIG. 2A shows an external perspective view, and FIG. 2B shows an external configuration diagram. The insertion portion distal end 16 is provided with an ultrasonic transducer 10 that enables electronic radial scanning. The ultrasonic transducer 10 is covered with a material on which an acoustic lens (ultrasonic transmission / reception unit) 17 is formed. Further, a slope 7 a is formed on the distal end hard portion 7. The slope portion 7a includes an illumination lens 18b that constitutes an illumination optical unit that irradiates the observation site with illumination light, an objective lens 18c that constitutes an observation optical unit that captures an optical image of the observation site, and a surgical tool that sucks the excised site. Is provided with a suction / forceps port 18d which is an opening through which the air flows and an air supply / water supply port 18a which is an opening for supplying and supplying air.

  FIG. 3 shows a manufacturing process (No. 1) of the ultrasonic transducer. In the figure, when the ultrasonic transducer 10 is formed, first, the substrate 20, the conductor 21, the electrodes 22 (22a and 22b), the piezoelectric element 23, and the acoustic matching layer 24 (first acoustic matching layer 24a and second acoustic matching). A structure A composed of the layer 24b), the conductive resin 25, and the groove 26 is produced. Now, the production of the structure A will be described.

  First, after forming the second acoustic matching layer 24b, the first acoustic matching layer 24a is formed. Next, using a dicing saw (precision cutting machine), for example, a groove is formed in the first acoustic matching layer 24a, and the conductive resin 25 is poured into the groove. Next, the piezoelectric element 23 in which the electrode layers 22a and 22b are formed on both opposing main surfaces is joined. Then, the substrate 20 is attached to the side of the piezoelectric element 23. An electrode layer 20 a is formed on the surface of the substrate 20. Then, a conductor 21 for electrically connecting the electrode layer 20a and the electrode layer 22a is attached.

  Using a dicing saw, the structure A formed above is cut to form a plurality of grooves (dicing grooves) 26 having a width of several tens of μm. The groove width is preferably 20 to 50 μm. At this time, the structure A is cut so that only the second acoustic matching layer 24b is not completely cut and remains several tens of μm. For example, about 200 such grooves 26 are provided. Here, each divided vibrator is referred to as a vibrator element 27.

In the above, since the present embodiment is a two-layer matching, an epoxy resin containing a filler such as alumina or titania (TiO ₂ ) is used as the material of the first acoustic matching layer 24a, and the second acoustic matching layer 24b is used. As the material, it is preferable to use an epoxy resin containing no filler. In the case of three-layer matching, the first acoustic matching layer is made of machinable ceramics, carbon or epoxy resin containing filler or fiber, and the second acoustic matching layer is filled with filler such as alumina or titania. It is preferable to use an epoxy resin containing a small amount (less than the case of two-layer matching) and using an epoxy resin containing no filler for the third acoustic matching layer.

Next, as shown in FIG. 4A, the structure A is bent into a cylindrical shape so that the side surface X1 and the side surface X2 of the laminate face each other.
Next, as shown in FIG. 4B, the acoustic lens 17 is formed on the cylindrical surface (hereinafter referred to as the structure B). The acoustic lens 17 may be combined with a cylindrical structure A that is manufactured in advance as a single acoustic lens, or the cylindrical structure A is placed in a mold and the acoustic lens material is used as the mold. The acoustic lens 17 may be formed by pouring into the lens. Of the acoustic lens 17, the lens unit 17a actually functions as an acoustic lens.

  Next, as shown in FIG. 4C, the annular structural member 30 a is attached inside the opening of the structure B. At this time, the structural member 30a is attached so as to be positioned on the substrate 20 (see FIG. 5A). The structural member 30b is similarly attached to the opening on the opposite side. At this time, the structural member 30b is attached so as to be positioned on the conductive resin 25 (see FIG. 5A).

  FIG. 5 shows a cross section of the structure B to which the structural member 30 is attached. After the structural members 30 (30a, 30b) are attached in FIG. 4C (see FIG. 5A), the space between the structural members 30a-30b is filled with the backing material 40 (see FIG. 5B). As the backing material, a gel-like epoxy resin mixed with an alumina filler is used. Thereafter, a conductor (copper wire) 41 is attached on the conductive resin 25 (see FIG. 5C) (hereinafter, the structure created in FIG. 5 is referred to as the structure C).

  Next, as illustrated in FIG. 6A, the cylindrical structural member 50 is inserted from one opening side (the side on which the substrate 20 is provided) of the structure C. The cylindrical structural member 50 includes a cylindrical portion 53 and an annular collar 52 provided at one end thereof. A printed wiring board 54 is provided on the surface of the collar 52, and several tens to several hundreds of electrode pads 51 are provided on the surface. Further, a bundle of cables 62 is passed through the cylindrical structural member 50, and the tips of the cables 62 are soldered to the pads 51 (the cables 62 inside the electrode pads 51 (in the center of the ring)). Is soldered and connected.). The cable 62 is usually a coaxial cable for noise reduction.

  The cylindrical structural member 50 is made of an insulating material (for example, engineering plastic). Examples of the insulator material include polysulfone, polyetherimide, polyphenylene oxide, and epoxy resin. The surface of the cylindrical portion 53 is plated with a conductor.

  When the cylindrical structural member 50 to which the cable 62 is thus connected is inserted into the structural body C, the flange 52 portion of the cylindrical structural member 50 hits the structural member 30 of the structural body C, and the position of the cylindrical structural member 50 is the structural body. It is fixed inside C and positioned inside the vibrator.

  6B shows a state where the cylindrical structure member 50 is inserted and positioned, and then the outer portion of the electrode pad 51 (electrode pad portion in the outer circumferential direction of the ring) and the electrode 20a of the transducer element 27 are wired. The state connected using 90 is shown.

  FIG. 7 shows an upper cross-sectional view of the tip of the electronic radial ultrasonic endoscope shown in FIG. FIG. 8 is a side sectional view of the tip of the electronic radial ultrasonic endoscope shown in FIG. As described above, there are a plurality of coaxial cables 62 inside the insertion portion of the electronic radial ultrasonic endoscope. A coaxial cable 62 is electrically connected to the wire 90 via the pad 51 of the printed wiring board 54 and the solder 101.

  The coaxial cable 62 is potted with a resin 100. The wire 90 is connected to the substrate 20 having the electrode layer 20a on the surface via the solder 102. The electrode layer 20a is electrically connected to a piezoelectric element 23 having an electrode layer 22a on the surface.

  On the other hand, the electrode facing the electrode layer 22a of the piezoelectric element 23 is an electrode layer 22b. The electrode layer 22b is electrically connected to the cylindrical portion of the cylindrical structural member 50 via the conductive resin 25, the copper foil 103 on the surface of the structural member 30b, and the conductive adhesive 104.

  Further, a backing material 40 is provided on the electrode layer 22 a side of the piezoelectric element 23, and an acoustic lens 17 is formed on the surface of the acoustic matching layer 24. A distal end structural member 106 is provided at the distal end of the vibrator portion configured as described above, and a structural member 105 is provided at a connection portion with the endoscope hard portion 7.

Embodiments of such an electronic radial ultrasonic endoscope according to the present invention will be described below.
<First Embodiment>
FIG. 9 shows an upper surface and a side cross-section of the printed wiring board 54 in the present embodiment. FIG. 9A and FIG. 9B are omitted views of FIG. 9C, 9D, 9E, and 9F are cross-sectional views of the cylindrical structural member 50 taken along the cutting line AA.

  As shown in FIGS. 9A and 9B, the printed wiring board 54 is provided in a donut shape on the surface of the flange 52 of the circumferential structural member 50. Electrode pads (hereinafter simply referred to as pads) 51 formed on the printed wiring board 54 are provided until reaching the end (outer peripheral side surface) of the printed wiring board 54 radially.

  As shown in FIG. 9C, the printed wiring board 54 may be obtained by bonding the flexible substrate 110 to the surface of the flange 52 of the cylindrical structural member 50, or as shown in FIG. 9D. As described above, the rigid substrate 111 may be bonded to the surface of the flange 52 of the cylindrical structural member. Furthermore, the pad 51 may be provided so as to cover the outer peripheral side surface of the printed wiring board 54 as shown in FIG.

  The following effects are obtained by the printed wiring board 54 in the present embodiment. First, the continuity check probe 120 can be brought into contact with the side surface of the pad instead of the upper surface of the pad (see FIG. 9F). Therefore, the conduction between the pad 51 and the coaxial cable 62 can be confirmed without damaging the pad 51 or the electrical connection between the pad 51 and the coaxial cable 62.

  Further, when the pad 51 is provided up to the outer peripheral side surface of the printed wiring board 54, even if the printed wiring board 54 is cut in order to reduce the diameter of the printed wiring board 54 as necessary, the printed wiring board after the cutting is cut. A pad 51 is always present on the outer peripheral side surface of 54. Therefore, even if the printed wiring board 54 is cut to an arbitrary diameter according to the diameter of the substrate 20, that is, the arrangement diameter of the piezoelectric elements 23 (opening diameter of the structure C), the pad 51 is always provided on the outer peripheral side surface. It comes to exist.

Further, by providing the pads 51 up to the outer peripheral side surface of the printed wiring board 54, the interval between the pads 51 can be widened.
As described above, quality deterioration can be prevented. Moreover, since the printed wiring board electrically connected to the piezoelectric elements arranged with various diameters can be easily manufactured, the manufacturing efficiency can be improved. Moreover, since it becomes easy to apply the probe 120 for a conductivity check to a specific pad at the time of conduction confirmation, workability | operativity can be improved.

<Second Embodiment>
FIG. 10 shows an upper surface and a side cross-section of the printed wiring board 54 in the present embodiment. 10A and 10C are omitted views of the upper surface of the printed wiring board 54. FIG. FIG. 10B is a cross-sectional view of the printed wiring board 54 taken along the cutting line BB. FIG. 10D is an explanatory diagram for forming the positioning groove.

  As shown in FIGS. 10A and 10B, positioning is performed on the outer peripheral side surface of the printed wiring board 54 on which the pad 51 is formed so that the tip of the probe 120 for continuity check can be positioned. A groove 121 is provided.

In addition, as shown in FIG.10 (c), you may change the magnitude | size or shape about the positioning groove | channel 121a of one place or multiple places among the positioning grooves 121. FIG.
The following means are used as means for providing the positioning groove 121 in the pad 51. For example, as shown in FIG. 10 (d), after a plurality of pads 51 are formed on the upper surface of the printed wiring board 51, a through hole 122 is provided in the portion covering the pad 51, and the printed wiring board 54 is connected to the through hole 122. Cut at the cutting position 123 on the center line. Alternatively, punching is performed using a die (punching punch (not shown)) having the same shape as the printed wiring board 54 having the positioning groove 121 on the outer peripheral side surface. Alternatively, the outer surface of the pad 51 is processed by a laser (not shown).

  The following effects are obtained by the printed wiring board in the present embodiment. First, by using the positioning groove 121, the continuity check probe 120 can be reliably and smoothly applied to the specific pad 51. Further, the positioning groove 121 can be used as a mark at the time of the operation of wiring the coaxial cable 62 or the wire 90 to the pad 51 or the operation of storing the transducer module that has performed the wiring operation in the endoscope.

  As described above, since continuity can be confirmed efficiently, workability can be improved. Further, since it is possible to prevent wiring mistakes and assembly errors during storage, the yield can be improved.

<Third Embodiment>
FIG. 11 shows an upper surface and a side cross-section of the printed wiring board 54 in the present embodiment. FIG. 11A is an abbreviated view of the upper surface of the printed wiring board 54. FIGS. 11B to 11F are cross-sectional views of the printed wiring board 54 taken along the cutting line CC.

  As shown in FIG. 11A, the printed wiring board 54 of the present embodiment has a pad further extended from the end (outer peripheral portion) of the printed wiring board 54 and protrudes into the air (flying lead structure). A pad 130 is provided. A plurality of pads 130 are provided on the printed wiring board 54.

  Next, as shown in FIG. 11B, after the pad 130 is bent toward the side surface of the printed wiring board, the conductivity is confirmed using the probe 120 for conductivity check. If it is not conducting at this time, it is kept bent as shown in FIG. On the other hand, if conductive, the pad 130 is cut at the end portion (outer peripheral side surface) of the printed wiring board 54 as shown in FIG.

  Note that the tip of the continuity check probe 120 may be a hook-shaped probe 131 as shown in FIG. Even when the tip of the probe 131 has a hook shape, conduction is confirmed after the pad 130 is bent to the side of the printed wiring board. At this time, if the probe 131 is conducting, the position control system 132 that is a device for pressing the tip of the probe 131 to a predetermined position is activated, so that the probe 131 does not touch the pad 130 as shown in FIG. Move in the direction of arrow P in e). As a result, the pad 130 remains folded.

  If it is not conducting, the position control system 132 is activated to move the probe 131 in the direction of the arrow Q, and the hook at the tip of the probe 131 is caught by the bent portion of the pad 130, and FIG. As in f), the pad 130 is folded back. Thereby, it becomes easier to distinguish the presence or absence of conduction.

  The following effects are obtained by the printed wiring board 54 in the present embodiment. First, it is possible to identify at a glance a portion that is not conducting. Further, by using the probe 131 having a hook shape at the tip, it becomes easier to distinguish the presence or absence of conduction.

As described above, since there is no leakage or duplication of the continuity confirmation work, the reliability of the product can be improved.
<Fourth embodiment>
FIG. 12 shows an upper surface of the printed wiring board 54 in the present embodiment. As shown in FIG. 12A, the printed wiring board 54 is a pad 140 having a different shape and size among the plurality of pads provided on the printed wiring board 54 (in FIG. 12A, in the longitudinal direction of the pad). Are provided with at least one slit.

  For example, as shown in FIG. 12B, a pad 142 having a short length in the longitudinal direction may be provided. Further, as shown in FIG. 12D, a pad 144 having a wide width (length in the short direction) may be provided. Further, as shown in FIG. 12C, a pad 143 having a slit may be provided among a plurality of pads provided on the printed wiring board 54.

  The following effects are obtained by the printed wiring board 54 in the present embodiment. Pads 140 having different shapes and sizes can be used as positioning marks. Therefore, when connecting the coaxial cable 62 that needs to be electrically connected to a reference piezoelectric element (not shown) and the signal board 141 that is electrically connected to the piezoelectric element (not shown). In this case, a connection error between the piezoelectric element and the cable can be prevented by using the pads 140 (142, 143, 144) having different shapes and sizes.

From the above, the product yield is improved.
<Fifth embodiment>
FIG. 13 shows an upper surface of the printed wiring board 54 in the present embodiment. As shown in FIG. 13A, the printed wiring board 54 is cut into printed wiring boards 54 located on both sides of any one of the pads 151 among the plurality of pads 3 provided on the printed wiring board 54. A notch 150 is provided.

  As shown in FIG. 13B, the notch 150 has a shim (gap on the surface of the structural member 30a located in the gap on both sides of the substrate 20 that is electrically connected to a reference piezoelectric element (not shown). After joining the adjustment component 152, a cylindrical structural member may be inserted into the structure C so as to insert the notch 150 into the shim 152 (see FIG. 13C).

  The following effects are obtained by the printed wiring board 54 in the present embodiment. The pad 54 provided between the substrate 20 connected to the reference piezoelectric element and the notch 150 is electrically connected via the printed wiring board 54. At this time, the notch 150 can be used as a positioning mechanism for the reference piezoelectric element.

  As described above, since a connection error between the piezoelectric element and the coaxial cable 62 can be prevented, the yield of products is improved. Further, in the connection work, the connection work can be easily performed without fine adjustment of the position, so that workability is improved.

<Sixth Embodiment>
FIG. 14 shows an upper surface of the printed wiring board 54 in the present embodiment. FIG. 15 shows a side surface of the printed wiring board 54 in the present embodiment. In the printed wiring board 54 of the present embodiment, the marking 160 is provided on the printed wiring board 54 or the cylindrical structural member 50 adjacent to the printed wiring board 54. By providing the marking 160 in the immediate vicinity of a specific piezoelectric element, the piezoelectric element can be easily identified.

  As shown in FIGS. 14 and 15A, the marking 160 is provided in the immediate vicinity of the pad 51 that is electrically connected to a reference piezoelectric element (not shown). The marking 160 is provided on the upper surface or side surface of the printed wiring board 54 or the side surface of the cylindrical structural member 50 using, for example, a laser.

  The marking 160 may be a numerical marking 161 as shown in FIG. In this case, for example, when the number of a reference piezoelectric element (not shown) is number 1, <1> is marked near the pad 51 of the printed wiring board 54 that is electrically connected to the number 1 element.

  Further, a plurality of number markings 161 may be provided as shown in FIG. In this case, for example, every ten markings 161 are attached corresponding to the piezoelectric elements, such as 1, 11, 21,. The number marking 161 is provided in the immediate vicinity of the corresponding pad 51 as in FIG.

  The following effects are obtained by the printed wiring board 54 in the present embodiment. When the module in which the piezoelectric element and the coaxial cable 62 are connected via the printed wiring board 54 is stored in the distal end hard portion 7, the marking portion can be used as a positioning mark for the distal end hard portion 7. .

  As described above, the assembly workability of the product is improved. In addition, since the optical image and the ultrasonic image can be reliably associated with each other, the quality of the product is improved.

It is a figure which shows the external appearance structure of the ultrasonic endoscope in this invention. It is an enlarged view of the front-end | tip part of the ultrasonic endoscope 1 of FIG. It is a figure which shows the manufacturing process (the 1) of an ultrasonic transducer | vibrator. It is a figure which shows the manufacturing process (the 2) of an ultrasonic transducer | vibrator. It is a figure which shows the manufacturing process (the 3) of an ultrasonic transducer | vibrator. It is a figure which shows the manufacturing process (the 4) of an ultrasonic transducer | vibrator. The upper cross-sectional view of the tip of the electronic radial ultrasonic endoscope shown in FIG. 6B is shown. FIG. 7 is a side sectional view of the distal end of the electronic radial ultrasonic endoscope shown in FIG. The upper surface and side cross section of the printed wiring board in 1st Embodiment are shown. The upper surface and side cross section of the printed wiring board in 2nd Embodiment are shown. The upper surface and side cross section of the printed wiring board in 3rd Embodiment are shown. The upper surface of the printed wiring board in 4th Embodiment is shown. The upper surface and perspective view of the printed wiring board in 5th Embodiment are shown. The upper surface of the printed wiring board in 6th Embodiment is shown. The side surface of the printed wiring board in 6th Embodiment is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ultrasonic endoscope 2 Insertion part 3 Operation part 4 Universal cord 4a Endoscope connector 5 Electric cable 5a Electric connector 6 Ultrasonic cable 6a Ultrasonic connector 7 Hard tip part 8 Bending part 9 Flexible tube part 10 Ultrasonic vibration Child 11 Angle knob 12 Air / water supply button 13 Suction button 14 Treatment instrument insertion port 17 Acoustic lens (ultrasonic wave transmitting / receiving unit)
18a Air / water supply port 18b Illumination lens 18c Objective lens 18d Suction / forceps port 20 Substrate 20a Electrode layer 21 Conductor 22 (22a, 22b) Electrode 23 Piezoelectric element 24 Acoustic matching layer 24a First acoustic matching layer 24b Second acoustic matching Layer 25 Conductive resin 26 Groove 27 Transducer element 30 (30a, 30b) Structural member 40 Backing material 41 Conductor (copper wire)
50 Cylindrical structural member 51 Electrode pad 52 Brim
53 Cylindrical portion 54 Printed wiring board 62 Coaxial cable 90 Wire 100 Potting resin 101, 102 Solder 103 Copper foil 104 Conductive resin 105 Structural member 106 Leading structural member 110 Flexible substrate 111 Rigid substrate 120 Probe for continuity check 121 Positioning groove 122 Through Hole 130 pad,
131 hook-shaped probe 132 position control system 140, 142, 143, 144 pad 141 signal base 150 electrically connected to a reference piezoelectric element 150 notch 151 pad 152 shim 160, 161 marking

Claims (6)

A plurality of piezoelectric elements for transmitting and receiving ultrasonic waves are arranged in a cylindrical shape, and a cable corresponding to each piezoelectric element for transmitting a drive signal for driving each piezoelectric element is formed inside the cylindrical body formed by the piezoelectric elements. An electrode pad that is housed and electrically connects the cable and the piezoelectric element is formed on the printed wiring board, and a hole through which the cable passes is provided in the center of the printed wiring board in the plane direction. Is an electronic radial ultrasonic transducer provided in the cylindrical body,
The electronic radial ultrasonic transducer is characterized in that the electrode pads are formed radially on the upper surface of the printed wiring board and exposed to the outer peripheral surface of the printed wiring board.   2. The electronic radial ultrasonic transducer according to claim 1, wherein a groove is formed in a short direction of the outer peripheral surface of a portion of the outer peripheral surface of the printed wiring board that is in contact with the electrode pad.   2. The electronic radial ultrasonic transducer according to claim 1, wherein at least one of the plurality of electrode pads is different in shape or size from an electrode pad other than the electrode pad. 3.   Cutouts are provided in the printed wiring board on both sides of at least one electrode pad of the plurality of electrode pads, and the printed wiring board is disposed along the cutouts at predetermined positions inside the cylindrical body. The electronic radial ultrasonic transducer according to claim 1, further comprising a guiding member for guiding the printed wiring board.   The marking for identifying the electrode pad that is electrically connected to the predetermined piezoelectric element is provided on an upper surface or a side surface of the printed wiring board or a side surface of a support member that supports the printed wiring board. 2. An electronic radial ultrasonic transducer according to 1. An ultrasonic endoscope comprising the electronic radial ultrasonic transducer according to any one of claims 1 to 5.