JP2010068930A - Imaging apparatus and endoscope - Google Patents

Abstract

An object of the present invention is to reliably prevent disconnection of a signal cable connected to a circuit board of a solid-state imaging device and peeling of a connection portion.
A distal end portion 13a constituting an insertion portion of an endoscope is provided with a CCD 38 and a circuit board 41 to which the CCD 38 is connected. A coaxial cable 46 constituting the multicore cable 28 is connected to the circuit board 41. The signal line 50 and the braided wire 52 are drawn from the coaxial cable 46 and soldered to the input / output terminal 44 of the circuit board 41 in a state where the signal line 50 is loosened with respect to the braided wire 52. The braided wires 52 are combined into one and soldered to the ground terminal 45. Further, a terminal portion including all of the input / output terminals 44 and the ground terminal 45 in the circuit board 41 and a portion in which at least the signal line 50 and the braided wire 52 are exposed in the multi-core cable 28 are exposed by the adhesive 60. Fix (integrated).
[Selection] Figure 5

Description

  The present invention relates to an imaging device that transmits and receives signals using a signal cable connected to a circuit board of a solid-state imaging device, and an endoscope that includes a solid-state imaging device at the distal end of an insertion portion.

  The endoscope includes an insertion portion that is inserted into the subject and an operation portion that is connected to the insertion portion. The insertion portion has a distal end portion, a bending portion, and a flexible tube portion in order from the distal end. The distal end portion is provided with an observation window, an illumination window, a forceps outlet, an air / water supply port, and the like. The bending portion is bent in any of the up, down, left, and right directions by rotating an angle knob provided in the operation portion. Thereby, the insertion property into the subject can be made smooth, and the tip can be directed in a desired direction within the subject.

  A solid-state imaging device for imaging the inside of the subject through the observation window is built in the distal end portion, and a signal cable connected to a circuit board of the solid-state imaging device is arranged in the insertion portion. In addition, an angle wire for bending the bending portion, a light guide for guiding illumination light from the light source device to the illumination window, and the like are arranged in the insertion portion.

As the signal cable connected to the circuit board of the solid-state imaging device, a multicore cable in which a plurality of coaxial cables are bundled is used. The coaxial cable includes a core wire (signal line) located at the center, an insulator covering the core wire, a braided wire covering the insulator, and a sheath covering the braided wire. In the coaxial cable, the core wire and the braided wire are soldered to the electrodes (terminals) of the circuit board, respectively. The core wire is used as a signal line for transmitting and receiving electrical signals between the solid-state imaging device and the processor device, and the braided wire is used as a ground wire grounded to the ground of the processor device (Patent Document 1).
JP 2001-095758 A

  Since the bending portion of the endoscope is inserted into the subject and bent into various shapes, the contents of the insertion portion move in the radial direction and the longitudinal direction of the insertion portion according to the bending. For this reason, bending and pulling force is applied to the multicore cable. When this force is transmitted to the vicinity of the connection portion by soldering between the electrode of the circuit board and the cable, the cable may be disconnected or the soldered portion may be peeled off.

  The above-mentioned problems such as disconnection are particularly problematic with respect to the core wire used as the signal wire rather than the braided wire used as the ground wire when a multi-core cable bundled with coaxial cables is used for connection with the solid-state imaging device. It was. The braided wire used as the ground wire is pulled out by peeling off the outer cover of the coaxial cable, and is connected to the electrode in a state of being gathered from a net state into a single thick wire. For this reason, the ground wire has a relatively high strength and a wide joint surface with the electrode, so that the joint strength is also relatively high. On the other hand, since the core wire is a single wire, the strength is weak and the bonding area is small. Therefore, when a load is applied to the coaxial cable, there is a high possibility that the core wire is disconnected or a portion where the core wire is soldered is peeled off. In the above-mentioned Patent Document 1, this problem is not discussed and no countermeasure is taken.

  The present invention has been made in view of the above problems, and provides an imaging device that reliably prevents disconnection of a signal cable connected to a circuit board and peeling of a connection portion, and an endoscope using the imaging device. For the purpose.

  In order to achieve the above object, an image pickup apparatus according to the present invention includes a circuit board having a solid-state image pickup element electrically connected and having a plurality of terminals, a signal line disposed in the center, and around the signal line. And a plurality of coaxial cables each including a ground line disposed via an insulator and having the terminal connected to the signal line and the ground line. The signal line is extended from the coaxial cable longer than the ground line, and is connected to the terminal in a state of being loosened from the ground line. At least the terminal portion of the circuit board and the wire portion of the coaxial cable where the signal line and the ground wire are exposed are fixed integrally with an adhesive.

  It is preferable to further include a frame that covers at least the terminal portion and the strand portion. By supplying the adhesive to the inside of the frame, the frame and each member housed in the frame are fixed integrally.

  The adhesive is supplied to the inside of the adhesive receiving jig, and integrally fixes the members housed in the adhesive receiving jig. The adhesive receiving jig covers at least the terminal portion and the wire portion, and is removed after the adhesive is cured.

  The adhesive is preferably an ultraviolet curable type. The adhesive is preferably an acrylic or epoxy resin.

  An endoscope according to the present invention includes an insertion portion that is inserted into a subject, a circuit board in which a solid-state imaging device provided at a distal end of the insertion portion is electrically connected, and a plurality of terminals are provided; The signal line and the ground line are connected to the terminal, each of which is composed of a signal line arranged in the center of the insertion portion and a ground line arranged through an insulator around the signal line. A plurality of coaxial cables. The signal line is extended from the coaxial cable longer than the ground line, and is connected to the terminal in a state of being loosened from the ground line. At least the terminal portion of the circuit board and the wire portion of the coaxial cable where the signal line and the ground wire are exposed are fixed integrally with an adhesive.

  According to the present invention, the signal line of the coaxial cable is drawn out longer than the ground line, and connected to a plurality of terminals provided on the circuit board of the solid-state imaging device in a state where the signal line is loosened from the ground line, In addition, at least the terminal portion of the circuit board and the bare wire portion of the coaxial cable where the signal line and the ground wire are exposed are integrated with an adhesive, so that the disconnection or connection location of the signal line connected to the circuit board Can be surely prevented.

  As shown in FIG. 1, the endoscope system 2 includes an electronic endoscope 10, a processor device 11, a light source device 12, and the like. The electronic endoscope 10 includes an insertion portion 13 to be inserted into a subject, an operation portion 14 connected to a proximal end portion of the insertion portion 13, and a universal cord 15 connected to the processor device 11 and the light source device 12. And.

  A connector 16 is attached to the tip of the universal cord 15. The connector 16 is a composite type connector to which the processor device 11 and the light source device 12 are connected.

  The processor device 11 performs various kinds of image processing on the imaging signal input from the CCD 38 (see FIG. 4), which is a solid-state imaging device for in-subject imaging, through the universal code 15 and the connector 16, and converts it into a video signal. At the same time, a drive control signal for controlling the drive of the CCD 38 is transmitted. The video signal converted by the processor device 11 is displayed as an endoscopic image on a monitor 17 connected to the processor device 11 by a cable. Further, the processor device 11 is electrically connected to the light source device 12 and comprehensively controls the operation of the entire endoscope system 2.

  The insertion portion 13 includes a distal end portion 13a, a bending portion 13b, and a flexible tube portion 13c in order from the distal end. The tip portion 13a is formed of a hard metal material or the like, and incorporates a CCD 38 or the like. The flexible tube portion 13c is a portion that connects the operation portion 14 and the bending portion 13b in a thin shape with a long diameter, and has flexibility.

  In FIG. 2, the flexible tube portion 13 c is covered with a screw tube 21 called a flex that protects the inside while maintaining flexibility in order from the inside, and the screw tube 21 is covered to prevent the extension of the screw tube 21. The net 22 is composed of three layers of a net 22 called a blade and an outer layer 23 having a resin deposited on the net 22. Inside the flexible tube portion 13c, a plurality of contents such as light guides 24 and 25 for guiding illumination light, forceps channel 26, air / water supply channel 27, multi-core cable 28, angle wire 29, etc. are idle. The configuration is inserted.

  The four angle wires 29 are fixed to the distal end portion 13a and are inserted into the close contact coil pipe 29a. The close contact coils are interlocked with the operation of the angle knob 18 (see FIG. 1) provided in the operation portion 14. It is pushed and pulled inside the pipe 29a. The bending portion 13 b is configured by connecting a plurality of bending pieces, and bends in the vertical and horizontal directions in conjunction with the movement of the angle wire 29. As a result, the distal end portion 13a is directed in a desired direction in the body cavity, and the observed site in the body cavity can be imaged by the CCD 38.

  3 and 4, an observation window 31, illumination windows 32 and 33, a forceps outlet 34, and an air / water supply nozzle 35 are provided on the end face of the distal end portion 13a. In the back of the observation window 31, an objective optical system 36 for capturing image light in the body cavity is disposed. The image light of the observation site via the objective optical system 36 is incident on the prism 37 and bent inside the prism 37 to form an image on the imaging surface 38 a of the CCD 38. The prism 37 is connected to a cover glass 40 described later.

  The exit ends of the light guides 24 and 25 face the illumination windows 32 and 33. The light guides 24 and 25 are formed by bundling a large number of optical fibers (for example, made of quartz). The light guides 24 and 25 pass through the insertion portion 13, the operation portion 14, the universal cord 15, and the connector 16. When the connector 16 is connected to the light source device 12, illumination light emitted from the light source device 12 is It guides to the illumination windows 32 and 33 and irradiates the site to be observed in the body cavity.

  The air supply / water supply nozzle 35 is connected to the air supply / water supply channel 27, and is operated by operating an air supply / water supply button 19 (see FIG. 1) provided in the operation unit 14. Air and wash water supplied from an air / water supply device (not shown) are jetted onto the observation window 31. The forceps outlet 34 communicates with the forceps channel 26. Various treatment tools for performing treatment on the site to be observed are inserted into the forceps channel 26 from the forceps port 20 (see FIG. 1) provided in the operation unit 14.

  The CCD 38 is composed of, for example, an interline type CCD, and a bare chip having an imaging surface 38a provided on the surface is used. On the imaging surface 38a, a rectangular plate-like cover glass 40 is attached via a square frame-like spacer 39.

  As shown in FIG. 5, a circuit board 41 having a thickness substantially equal to that of the CCD 38 is bonded to the rear end surface of the CCD 38. Terminals 42 are concentrated on the side edge 38 b of the rear end side of the insertion portion 13 of the CCD 38. On the other hand, on the circuit board 41, the terminals 43 are concentrated on the edge portion 41a on the distal end side of the insertion portion 13 facing the edge portion 38b. The terminal 42 and the terminal 43 are electrically connected by a bonding wire or the like. The objective optical system 36, the CCD 38, the circuit board 41, and the like constitute the imaging apparatus of the present invention.

  Further, on the rear end side of the terminal 43 of the circuit board 41, an input / output terminal 44 and a ground terminal 45 to which a signal line 50 and a braided line 52 described later are soldered are provided. In the figure, the ground terminal 45 is hatched so that the input / output terminal 44 and the ground terminal 45 can be easily distinguished. The input / output terminals 44 and the ground terminals 45 are arranged in a line along a radial direction orthogonal to the direction (axial direction) of the tube axis of the insertion portion 13. A multi-core cable 28 is connected to the input / output terminal 44 and the ground terminal 45.

  In the multicore cable 28, a plurality of coaxial cables 46 are bundled, and an outer cover 47 covers the bundled coaxial cables 46 (see also FIG. 2). The multi-core cable 28 has an outer skin 47 removed on one end side in the vicinity of the circuit board 41 to expose a plurality of coaxial cables 46.

  In FIG. 6, each coaxial cable 46 includes a signal line 50, an insulator 51 that covers the signal line 50, a braided wire (ground line) 52 that covers the signal line 50 via the insulator 51, and a braided wire 52. It consists of an outer skin 53 that covers the top. In the coaxial cable 46, a part of the outer sheath 53 is removed in the vicinity of the circuit board 41, and the signal line 50 and the braided line 52 are drawn out.

  Returning to FIG. 5, the signal line 50 is soldered to the input / output terminal 44 of the circuit board 41 in a state where the signal line 50 is more slack than the braided line 52. The braided wire 52 is soldered to the ground terminal 45 in a state where a plurality of braided wires constituting the braided wire 52 are bundled and apparently formed into one thick line.

  As shown in FIG. 7, the slack of the signal line 50 is extracted from the coaxial cable 46 and exposed to the outside from the outer sheath 53 of the coaxial cable 46 (external exposed length) L 1. It is provided by making it longer than the exposure length L2 (L1> L2). The difference between the externally exposed lengths L1 and L2 of the signal line 50 and the braided line 52 is preferably 0.5 mm or more. Thus, if the external exposure length of the signal line 50 is longer than the braided wire 52 and the signal line 50 is slack, each coaxial cable is pulled when the multi-core cable 28 is pulled to the proximal end side of the insertion portion 13. The load applied to 46 is borne by the braided wire 52 having a short external exposure length. Since the load is not applied to the signal line 50, or even if it is applied, the signal line 50 can be prevented from being disconnected or the soldered portion of the signal line 50 from being peeled off.

  On the other hand, since the braided wire 52 that bears the tensile force of the coaxial cable 46 is bundled with a plurality of wires, the braided wire 52 has high durability against pulling and is not likely to be disconnected. Further, for the same reason, the braided wire 52 has a large contact area with the solder, so that the connection strength with the solder is high, and the braided wire 52 does not peel off from the soldered portion.

  As shown in FIG. 5, the circuit board 41 is provided with the same number of ground terminals 45 as the input / output terminals 44 to which the signal lines 50 are connected, and these are alternately arranged. Each braided wire 52 drawn from each coaxial cable 46 is connected to each ground terminal 45 one by one.

  The signal line 50 drawn from each coaxial cable 46 is connected to the input / output terminal 44 farther than the input / output terminal 44 at the shortest distance by crossing the signal line 50 of the adjacent coaxial cable 46. This is a device for reducing the curvature of the signal line 50.

  That is, as shown in FIG. 8A, as shown in FIG. 8B, the signal line 50 is connected to the input / output terminal 44 at the shortest distance without crossing the signal line 50 as shown in FIG. In addition, when the signal line 50 is crossed and connected to the input / output terminal 44 farther than the shortest distance, the curvature when the signal line 50 has the same slack amount S becomes smaller. Here, the slack amount S is obtained when the linear distances D1 and D2 between the base end of the signal line 50 from which the coaxial cable 46 is drawn and the input / output terminal 44 are strings, and the signal line 50 having slack is an arc. The maximum length of the vertical line drawn from the arc to the string. If the amount of slack S is the same, the longer the string, the smaller the curvature of the arc. When the signal lines 50 are crossed, the straight line distance D2 is longer than the straight line distance D1 when the signal lines 50 are not crossed, so that the curvature of the signal line 50 becomes small.

  If the curvature of the signal line 50 is too large, the possibility that a so-called kink that the signal line 50 bends and plastically deforms and does not return to the original state increases. By intersecting the signal lines 50, the curvature of the slackened signal lines 50 is suppressed, so that the occurrence of kinks is prevented.

  Of course, even if the signal lines 50 are not crossed, if the distance between the input / output terminal 44 and the ground terminal 45 is increased, the linear distance D can be increased, so that the curvature can be suppressed. However, increasing the distance between the input / output terminal 44 and the ground terminal 45 leads to an increase in the size of the circuit board 41. If the signal lines 50 are crossed as in this example, the curvature of the signal lines 50 can be suppressed without increasing the size of the circuit board 41.

  In this example, each signal line 50 intersects with the signal line 50 of the adjacent coaxial cable 46, but it intersects with the signal line 50 of the adjacent coaxial cable 46 instead of the adjacent coaxial cable 46. You may let them.

  Returning to FIG. 5, a terminal portion including all of the input / output terminals 44 and the ground terminal 45 in the circuit board 41, a wire portion in which the signal line 50 and the braided wire 52 are exposed in the multicore cable 28, The signal wire 50 and the braided wire 52 exposed from the outer sheath 47 of the core cable 28 and the tip of the multi-core cable 28 are fixed (integrated) with an adhesive 60. The application range of the adhesive 60 is indicated by dots in the figure. Further, in FIG. 4, the adhesive 60 is not shown in order to avoid complication.

  As the adhesive, for example, an ultraviolet (UV) curable adhesive can be used. After the signal line 50 and the braided line 52 are connected (soldered) to the input / output terminal 44 and the ground terminal 45, the adhesive 60 is supplied to the aforementioned range using an adhesive supply device (not shown). Thereafter, the adhesive 60 is cured by irradiating the adhesive 60 with ultraviolet rays using an ultraviolet lamp (not shown) or the like.

  As described above, the signal line 50 and the braided line 52 are integrated with a part of the circuit board 41 including the soldered portions to the input / output terminal 44 and the ground terminal 45 by the adhesive 60, so that the strength itself is weak. The signal line 50 and the soldered portion thereof can be given strength that can sufficiently withstand a tensile load, a compressive load, and a torsion load.

  The operation of the above configuration will be described. When the inspection is performed by the endoscope system 2, the connector 16 of the electronic endoscope 10 is inserted into the processor device 11 and the light source device 12, and the processor device 11 and the light source are connected with the processor device 11 and the light source device 12 connected. The power switch of the device 12 and the lighting switch of the light source are turned on. When the power switch is turned on, power is supplied to each part of the processor device 11 and the light source device 12, power is supplied from the processor device 11 to the electronic endoscope 10, and the CCD 38 is activated.

  When changing the observation direction when the light source of the light source device 12 is turned on and the CCD 38 is activated to start imaging in the body cavity and the examination is being performed, the operator operates the angle knob 18. Thus, the bending portion 13b is bent to change the angle of the distal end portion 13a with respect to the flexible tube portion 13c.

  By bending the bending portion 13b into various shapes, the signal line 50 and the braided wire 52 of the coaxial cable 46 are pulled, pushed, or twisted in the axial direction and the radial direction of the distal end portion 13a, respectively. However, since the signal line 50 and the soldered portion thereof are integrated by the adhesive 60 together with the braided wire 52 and the soldered portion thereof and a part of the circuit board 41, these loads are partially applied to the signal line 50. There is no participation. Moreover, this integrated part has sufficient tolerance with respect to these loads. Therefore, disconnection of the signal line 50 and peeling of the soldered portion are prevented.

  Further, since the signal line 50 is connected to the circuit board 41 so as to be loosened with respect to the braided wire 52, even if a load is applied to the coaxial cable 46 when it is partially pulled or twisted, The load is mainly applied to the braided wire 52 having high strength and connection strength of the wire itself, and hardly or hardly applied to the signal line 50. With this structure, the signal line 50 having relatively low strength and connection strength can be further protected from disconnection and peeling. Thus, since the double countermeasure is taken in order to prevent disconnection of the signal line 50 and peeling of the soldered portion, this problem can be surely prevented.

  In the first embodiment, after the circuit board 41 and the coaxial cable 46 are wired, the adhesive 60 is directly supplied to the peripheral edges of these members. However, as shown in FIG. For this purpose, the circuit board 41 and the coaxial cable 46 may be fixed by providing a frame body 70 and injecting the adhesive 60 into the frame body 70.

  The frame 70 is not limited to the cylindrical shape (radial cross-sectional circle) illustrated in FIGS. 9 and 10A, but may be, for example, a radial cross-sectional shape such as FIG. 10B prismatic shape or (C) U-shape. Can be taken. The material of the frame 70 may be either resin or metal. Although the frame body 70 in FIG. 9 is actually cylindrical, a cross-sectional view of the cylinder cut in the axial direction is shown for explanation.

  After the signal line 50 and the braided line 52 are connected (soldered) to the input / output terminal 44 and the ground terminal 45, the frame body 70 is connected to the input / output terminal 44 and the ground terminal 45 of the circuit board 41 within the frame. A terminal portion including the wire portion of the multicore cable 28 where the signal wire 50 and the braided wire 52 are exposed, the exposed portion of the signal wire 50 and the braided wire 52 exposed from the outer sheath 47 of the multicore cable 28, and Position the core cable 28 so that the tip of the core cable 28 is accommodated. After positioning the frame body 70, the adhesive 60 is supplied into the frame body 70 using an adhesive supply device or the like.

  By using the frame body 70, the application range (space) of the adhesive 60 can be accurately positioned. As a result, the application volume of the adhesive 60 can be inadvertently increased and the space efficiency of the tip end portion 13a can be deteriorated, or the adhesive 60 can adhere to unintended portions. Since integration of the intended part can be achieved, space efficiency can also be improved. Furthermore, if the frame body 70 with high strength is used, the integrated part by the adhesive 60 can be further strengthened, and the disconnection of the signal line 50 and the peeling of the soldered portion can be more strongly prevented.

  When a metal is used as the frame body 70, it can function as an electromagnetic shield that prevents noise from getting on the signal line 50 if the frame body 70 is connected to the ground. On the other hand, when resin is used as the frame body 70, it can be formed so as to avoid interference with surrounding built-in objects by taking advantage of the degree of freedom of molding, or unnecessary portions can be scraped off. This can contribute to the improvement of work efficiency and space efficiency.

  The frame 70 may be used as an adhesive receiving jig to define the application range of the adhesive 60, and the frame 70 may be removed after the adhesive 60 is cured. By removing the frame body 70 used for positioning, the space efficiency in the width direction (cable radial direction) of the circuit board 41 can be further improved. In addition, when using the frame body 70 as a jig | tool, it is preferable not to adhere | attach with the adhesive agent 60, such as smoothing the inner surface of the frame body 70. FIG. As with the frame body 70, jigs having various shapes and materials can be used.

  In the above embodiment, a UV curable adhesive is used as the adhesive 60 as an example. From the viewpoint of workability, the use of a UV curable adhesive is preferable, but the type of adhesive is not limited thereto. From the viewpoint of the material, it is preferable to use an acrylic or epoxy adhesive. In the second embodiment using the frame body 70, the frame body 70 is positioned after soldering. For example, a jig having a sufficient opening for wiring, such as a U-shaped frame body, is used. When used, the frame 70 may be positioned before soldering.

  The portions to be integrated with the adhesive 60 are at least the terminal portions including all of the input / output terminals 44 and the ground terminals 45 in the circuit board 41, and the signal wires 50 and the braided wires 52 in the multicore cable 28 are exposed. Any wire portion may be used.

  In the above embodiment, the electronic endoscope 10 is illustrated for explaining the present invention. However, the present invention is not limited to this, and an ultrasonic endoscope in which an ultrasonic transducer is integrated at the tip, etc. The present invention can also be applied to other types of endoscopes. Furthermore, the imaging device of the present invention can be applied to devices other than endoscopes as long as a signal cable is connected to a circuit board.

It is an external view of an endoscope system. It is sectional drawing which shows the inside of a flexible tube part. It is a top view which shows the end surface of a front-end | tip part. It is sectional drawing which looked at the inside of a front-end | tip part from the side surface. It is a top view which shows the structure around CCD and a circuit board. It is sectional drawing which shows the inside of a coaxial cable. It is a top view which shows the length of a signal wire and a braided wire. It is a top view which shows the amount of slack of a signal wire and a braided wire. It is a top view which shows the structure around CCD and the circuit board to which 2nd Embodiment is applied. It is sectional drawing which shows the radial direction cross section of a frame.

Explanation of symbols

2 Endoscope System 10 Electronic Endoscope 13a Tip 28 Multi-core Cable 38 CCD
41 circuit board 44 input / output terminal 45 ground terminal 46 coaxial cable 50 signal line 52 braided wire 60 adhesive 70 frame

Claims (6)

A circuit board to which a solid-state imaging device is electrically connected and having a plurality of terminals;
A signal line arranged in the center and a ground line arranged around the signal line via an insulator, and the terminal includes a plurality of coaxial cables to which the signal line and the ground line are respectively connected.
The signal line is drawn from the coaxial cable longer than the ground line, and is connected to the terminal in a loosened state than the ground line,
At least the terminal portion of the circuit board and the wire portion of the coaxial cable from which the signal line and the ground wire are exposed are fixed integrally with an adhesive. . A frame that covers at least the terminal portion and the wire portion;
The image pickup apparatus according to claim 1, wherein the frame and each member housed in the frame are integrally fixed by supplying the adhesive into the frame.   The adhesive covers at least the terminal portion and the wire portion, and is supplied to the inside of the adhesive receiving jig to be removed after the adhesive is cured, and is stored in the adhesive receiving jig. The imaging apparatus according to claim 1, wherein the members are fixed integrally.   The imaging apparatus according to claim 1, wherein the adhesive is of an ultraviolet curable type.   The imaging apparatus according to claim 1, wherein the adhesive is an acrylic resin or an epoxy resin. An insertion part to be inserted into the subject;
A circuit board in which a solid-state imaging device provided at a distal end of the insertion portion is electrically connected and provided with a plurality of terminals;
The signal line and the ground line are connected to the terminal, each of which is composed of a signal line arranged in the center of the insertion portion and a ground line arranged through an insulator around the signal line. A plurality of coaxial cables,
The signal line is drawn from the coaxial cable longer than the ground line, and is connected to the terminal in a loosened state than the ground line,
At least the terminal portion of the circuit board and the strand portion of the coaxial cable where the signal line and the ground wire are exposed are fixed integrally with an adhesive. mirror.

Images