JP2002078677A - Cable structure for electronic endoscope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable structure which can make a cable thinner in diameter by exposing a braided shield by providing a notched groove at the end section of a coating member coating the shield and connecting a grounding wire to the exposed portion of the shield. SOLUTION: In this cable structure for electronic endoscope, the braided shield 16 incorporated in the coating member 18 is exposed by forming the notched groove 18A at the end section of the member 18. The grounding wire 24 is connected to the exposed portion of the shield 16. A cable protective member 26 is put on and connected to the coating member 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable structure of an electronic endoscope, and more particularly to a cable structure of an electronic endoscope for transmitting a video signal from a solid-state image pickup device (CCD) provided in the electronic endoscope.

[0002]

2. Description of the Related Art In an electronic endoscope, a CCD is arranged behind an image pickup optical system provided in a rigid portion at a distal end of an insertion portion.
The CCD is fixed on a substrate made of ceramic or the like, and a number of core wires are connected to predetermined terminals on the substrate.

[0003] A multi-core cable is constructed by converging the above-mentioned core wire into a cable composed of a conductive braided shield and a non-conductive sheath. The multi-core cable is connected to a processor, and the processor transmits C from the core.
The video signal photoelectrically converted by the CD is subjected to signal processing, and the subject is displayed on the monitor device.

As shown in FIG. 4, the multi-core cable is formed by winding a core wire 1 with an insulating tape 9 and covering the core wire 1 with a conductive braided shield 2 and a non-conductive sheath 3. You. The braided shield 2 is connected to a ground wire 4 inside the endoscope insertion portion, and the outer cover 3 is connected to a cable protection member 5 that covers the ground wire 4 and the core wire 1.

[0005] The connection structure between the braided shield 2 and the ground wire 4 is described in, for example, Japanese Patent Laid-Open No. 6-285020. FIG. The shield 2 is extended from the outer cover 3 and twisted, and the ground wire 4 is soldered to the twisted portion.
A protective tube 6 is fitted around the core 1 inside the connection between the braided shield 2 and the ground wire 4. When the ends of the braided shield 2 and the ground wire 4 come apart, they come into contact with each other. 1 to prevent a short circuit. Further, two attachment tubes 7 and 8 are jacketed at a connection portion between the braided shield 2 and the ground wire 4. Then, the vicinity of the connection between the braided shield 2 and the ground wire 4 is held by the protective tube 6 and the mounting tube 7, and the cable protecting member 5 is sandwiched by the mounting tubes 7 and 8. The outer cover 3 having a different thickness and the cable protective member 5 are connected by the protective tube 6 and the mounting tubes 7 and 8.

[0006]

However, the conventional cable structure comprises a protective tube 6 and mounting tubes 7 and 8.
Therefore, there is a disadvantage that the multi-core cable becomes thicker.

[0007] In addition to the multi-core cable, a forceps channel, a wire guide for focus adjustment, an angle operation wire, an air supply / water supply channel, and the like are provided in the insertion portion of the electronic endoscope. When the thickness of the multi-core cable becomes large, the space for disposing the forceps channel and the like is limited. Therefore, there is a demand to make the multi-core cable as thin as possible.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cable structure of an electronic endoscope that can make a multicore cable thin.

[0009]

According to the present invention, in order to achieve the above object, a cable inserted through an endoscope insertion portion includes a core, a conductive shield covering the core, and a shield. And a non-conductive covering member for covering the
In the cable structure of an electronic endoscope in which the shield is connected to a lead wire and the covering member is connected to a protection member that covers the lead wire and the core wire, a connection portion between the lead wire and the shield is While the lead wire is connected to the shield which is exposed by cutting out a part of the covering member, the protection member is fitted around the covering member,
A connection portion between the lead wire and the shield is covered.

According to the present invention, since the lead wire is connected to the shield, which is formed by cutting out and exposing the covering member, the connecting portion between the shield and the lead wire is accommodated in the notch portion of the covering member. Therefore, since the connecting portion is not bulky, the cable can be made thin.

Further, since the connecting portion between the shield and the lead wire is arranged in the notch of the covering member, the protecting member can be directly connected to the covering member. Touching the line can be prevented.
Therefore, the protection tube and the mounting tube are not required, and the cable can be made thinner.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a cable structure for an electronic endoscope according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 is an overall view of an electronic endoscope to which a cable structure according to the present invention is applied. As shown in the figure,
The imaging optical system 3 is provided in the rigid portion 30 at the distal end of the insertion portion of the electronic endoscope.
2 is disposed, and an optical path changing prism 34 is disposed behind the imaging optical system 32. At the exit end of the prism 34, a CCD 36 is provided.
Are fixed on a substrate 38 made of ceramic or the like.
.. (See FIG. 2) are connected to predetermined terminals on the substrate 38, respectively.

The core wires 12, 12...
Converged within 0 and connected to processor 40. The processor 40 receives the C transmitted from the cores 12, 12,...
The video signal photoelectrically converted by the CD 36 is subjected to signal processing, and a subject image is displayed on the monitor device 42.

[0015] As shown in FIG.
Is configured by covering the core wire 12 with a conductive braided shield 16 and a covering member 18 covering the braided shield 16. The covering member 18 is made of a non-conductive material such as a fluororesin or polyvinyl chloride. In addition, core wire 12
Between the braided shield 16 and the braided shield 16, there is interposed an insulator 14 configured such that a polyester sealing tape is wound around the core wire 12. The insulator 14 is arranged to be slightly longer (t) than the braided shield 16, so that the end of the braided shield 16 directly touching the core 12 can prevent the core 12 from being damaged and short-circuited. The multi-core cable 10 configured as described above has a characteristic that the diameter is relatively small, and is arranged in the distal end hard portion or the curved portion of the endoscope insertion portion.

On the other hand, as shown in FIG. 2, the side of the multi-core cable 10 on which the CCD is fixed (hereinafter referred to as CCD board) has a core wire 12 and a ground wire (corresponding to a lead wire) 24.
Are covered with a cable protection member 26. The distal end 24A of the ground wire 24 is connected to the braided shield 16, and the base end of the ground wire is connected to a ground terminal (not shown). Further, the cable protection member 26 is configured by a silicon tube or a heat shrink tube. The multi-core cable 10 configured as described above has a characteristic that the flexibility is relatively large, and is arranged in the flexible portion of the endoscope insertion portion.

As shown in FIG. 3, the connection structure between the ground wire 24 and the braided shield 16 is as follows. First, a U-shaped notch groove 18A is formed at the end of the covering member 18, and the braided shield 16 is formed.
To expose. By soldering the tip 24A of the ground wire 24 to the exposed portion of the braided shield 16, the tip of the ground wire 24 is separated and the core wire 12 is removed.
Can prevent the core wire 12 from being damaged and short-circuited.

Next, the cable protection member 26 is directly fitted to the end of the covering member 18 and then bonded. As a result, the cutout groove 18A is completely covered by the cable protection member 26, and the connection between the ground wire 24 and the braided shield 16 is protected.

According to the cable structure configured as described above, the connection between the braided shield 16 and the ground wire 24 is housed inside the cutout groove 18A, so that the connection is not bulky and the multicore cable 10 can be connected. Can be thin.

Further, by arranging the connection portion in the notch groove 18A, the cable protection member 26 can
Since the connection can be made by directly fitting the cable 8 to the outside, a mounting tube is not required, and the multicore cable 10 can be made thinner accordingly.

Further, the insulator 14 is disposed slightly longer than the braided shield 16 and the connection portion is formed by the notch groove 1.
8A, the end of the braided shield 16 and the tip 24A of the ground wire 24 can be prevented from directly contacting the core 12, and a protective tube for preventing short circuit is not required. The connecting portion of the multicore cable 10 can be made thin.

The present invention can be applied to any multi-core cable having a structure in which the core is covered by a conductive braided shield and a non-conductive covering member covering the braided shield.

[0023]

As described above, according to the cable structure of the electronic endoscope according to the present invention, the lead wire is connected to the shield exposed by cutting out the covering member, and the shield is inserted into the notch of the covering member. Since the connection portion between the cable and the lead wire is accommodated, the connection portion is not bulky, and the cable can be made thin.

Further, by arranging the connection between the shield and the lead wire in the notch of the covering member, the protection member is directly connected to the covering member, and the end of the shield and the tip of the lead wire are directly connected to the core wire. Since the touch tube is prevented from being touched, the protective tube and the mounting tube become unnecessary, and the cable can be made thinner.

[Brief description of the drawings]

FIG. 1 is an overall view showing an electronic endoscope employing a cable structure according to the present invention.

FIG. 2 is a sectional view showing a cable structure according to the present invention.

FIG. 3 is a plan view of the cable viewed from the direction of the arrow in FIG. 2;

FIG. 4 is a sectional view showing a conventional cable structure.

[Explanation of symbols]

10: multi-core cable, 12: core wire, 14: insulator, 16
... braided shield, 18 ... covering member, 18A ... notch, 2
4: Ground wire, 26: Cable protection member

Claims (2)

[Claims] 1. A cable inserted through an endoscope insertion portion, comprising: a core; a conductive shield covering the core; and a non-conductive covering member covering the shield.
In the cable structure of the electronic endoscope in which the shield is connected to a lead wire and the covering member is connected to a protection member that covers the lead wire and the core wire, a connection portion between the lead wire and the shield includes: The lead wire is connected to the shield in which a part of the covering member is cut out and exposed, and the protection member is fitted over the covering member to cover a connection portion between the lead wire and the shield. A cable structure for an electronic endoscope. 2. An insulator is interposed between the core and the shield so as to cover the core, and the insulator extends from an end of the shield. The cable structure of the electronic endoscope according to the above.