JP3742620B2 - Signal cable fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal cable fixing structure, and more particularly to a signal cable fixing structure of an endoscope apparatus characterized by a structural part such as a connector connected to a camera head.
[0002]
[Prior art]
The outer layer of the cable is preferably made of a material having flexibility in bending from the viewpoint of operability, and the outer layer made of silicon is increasingly used for autoclave sterilized products in consideration of heat resistance. The thickness of the outer skin layer may be thickened with priority given to strength or thinned with priority given to the outer diameter according to the required specifications of the product. In the case of materials, an appropriate cable fixing method must be selected according to the situation.
[0003]
In view of this, for example, Japanese Patent Application Laid-Open No. 5-293078 discloses a method of fixing a cable by crimping a tubular member through which the cable is inserted. Japanese Patent Laid-Open No. 2000-237128 discloses a method for fixing a cable by applying a force in a shearing direction.
[Problems to be solved by the invention]
However, in the method disclosed in Japanese Patent Laid-Open No. 5-293078, the cable is fixed by receiving all the force at the caulking portion. If it is cut, the cable may come off. Further, when the outer skin layer is thickened, the outer skin is extended by a tensile force or the like, and the caulking force becomes weaker as the wall thickness becomes thinner, so that the cable may come off.
[0005]
In addition, the method disclosed in Japanese Patent Laid-Open No. 2000-237128 has the above-described problems, and there is a risk of disconnection in a signal line with a thin wire diameter. The invention also shows a method of caulking together with a cable fold prevention member made of an elastic member, but the above problem cannot be solved.
[0006]
The present invention has been made in view of the above circumstances, and even when a relatively soft material is used for the outer skin, the cable from the body portion or connector portion of the probe portion of the medical device is not affected by the thickness of the outer skin. An object of the present invention is to provide a signal cable fixing structure capable of improving the disconnection resistance.
[0007]
[Means for Solving the Problems]
The signal cable fixing structure of the present invention is a signal cable for fixing an end portion of a signal cable in which a signal line for transmitting a signal is sequentially covered with a conductive shield layer and a soft skin layer to a predetermined fixing object. In the fixing structure, a first tubular member that is inserted through the signal line and covered by the shield layer and is interposed between the signal line and the shield layer, and the first tubular member is covered. A step portion for forming an inner diameter portion smaller than an outer diameter of the covering portion of the shield layer in order to engage with the covering portion of the shield layer, and between the first tubular member and the step portion; To engage the second tubular member interposed between the shield layer and the outer skin layer so that the shield layer can be held, and the covering portion of the outer skin layer covering the second tubular member Outside the covering of the outer skin layer A third tubular member that has a protrusion with a smaller inner diameter and covers the covering portion of the outer skin layer so that the outer skin layer can be sandwiched between the second tubular member and the protrusion. Configured.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0009]
1 to 4 relate to a first embodiment of the present invention, FIG. 1 is a block diagram showing a configuration of an endoscope observation system, FIG. 2 is a cross-sectional view showing a configuration of a connector portion in FIG. FIG. 4 is a cross-sectional view showing a cross section taken along line AA of FIG. 2, and FIG. 4 is an enlarged view of the substrate fixing member of FIG.
[0010]
(Constitution)
As shown in FIG. 1, an endoscope observation system 1 includes an endoscope 2, a light source device 3 that supplies illumination light to the endoscope 2, and a light that connects between the endoscope 2 and the light source device 3. An endoscope imaging device 5 connected to the guide cable 4 and the endoscope 2 and having a solid-state imaging device (for example, a CCD) (not shown), and a video processor 6 for processing signals from the endoscope imaging device 5 And a monitor 7 connected to the video processor 6 and displaying a video signal from the video processor 6.
[0011]
The endoscope imaging device 5 includes a camera head unit 8, a signal cable 9, and a connector unit 10 held by an operator.
[0012]
As shown in FIGS. 2 and 3, in the connector unit 10, reference numeral 14 denotes a resin connector exterior, the signal cable 9 is inserted on the camera head unit 8 side, and the substrate 15 is accommodated on the processor 6 side. .
[0013]
The signal cable 9 is soldered to the land portion 16 of the substrate 15. The substrate 15 is fixed to the substrate fixing member 17 by a pressing member 19 that engages with the convex portion 18 of the substrate fixing member 17 and is screwed with the substrate 15 interposed therebetween. The board fixing member 17 and the electromagnetic shield case 21 that almost entirely covers the inner wall of the connector exterior 14 are screwed by screws 22 and are electrically connected.
[0014]
The board fixing member 17 is provided with a cable insertion hole 24, and the distal end portion of the signal cable 9 is fixed as follows.
[0015]
That is, as shown in FIG. 4, a pipe member 28 is provided between the signal line 26 and the electromagnetic shield layer 27 made of knitted metal wire, and is provided in the vicinity of the fixed portion of the signal cable 9, and is made of silicon rubber. A cylindrical member 29 is provided between the outer skin layer 23 made of PVC or the like and the electromagnetic shield layer 27 so as to be interposed in the vicinity of the fixed portion of the signal cable 9.
[0016]
The cylindrical member 29 has a stepped portion 30 that accommodates a pipe member 28 whose inner diameter on the substrate side is covered with an electromagnetic shield layer 27. The outer diameter on the camera head portion 8 side is covered with an outer skin layer 23 and has a non-slip portion 31. It has the step part 32 which has.
[0017]
Further, a groove 33 having a V-shaped cross section is formed in a circumferential direction on a part of the outer periphery of the cylindrical member 29 fitted to the inner diameter of the substrate fixing member 17, and a pointed fixing screw 34 screwed into the substrate fixing member 17 is formed. Are engaged.
[0018]
The electromagnetic shield layer 27 is spread in a flange shape so as to follow the end surface on the substrate side of the cylindrical member 29, and is fixed by a fixing nut 35. A protrusion 36 having an inner diameter smaller than the outer diameter of the covering portion of the outer skin layer 23 covering the cylindrical member 29 is provided on the camera head portion 8 side on the inner periphery of the substrate fixing member 17.
[0019]
A packing 38 for waterproofing the signal cable 9 and the substantially cylindrical frame 37 is provided at the end of the connector exterior 20 on the camera head 8 side, and the signal cable 9 is tightened by being compressed by a tightening nut 39. Yes.
[0020]
A rubber folding member 40 that covers and protects the outer periphery of the signal cable 9 is fitted to the rear end portion of the frame 37, and is prevented from being bent by a nut member 41 that is screwed into the rear end portion of the connector sheath 20. A seal portion 42 provided in the circumferential direction of the member 40 is compressed and sandwiched. Reference numeral 43 denotes a waterproof packing.
[0021]
(Function)
The outer skin layer 23 is sandwiched and fixed between a rear end portion of the cylindrical member 29 and a step portion 36 having an inner diameter of the substrate fixing member 17. Further, the slipper 31 is also fixed in the removal direction.
[0022]
Further, the amount of force for tightening the outer skin layer 23 by the rear end portion of the cylindrical member 29 and the protrusion 36 can be adjusted by the advancement and retraction of the fixing screw 34.
[0023]
The electromagnetic shield layer 27 is fixed by a fixing nut 35 and is fixed between the end of the pipe member 28 on the camera head portion 8 side and the step portion 30 having an inner diameter of the cylindrical member 29.
[0024]
The electromagnetic shield layer 27 is electrically connected to the cylindrical member 29 by being clamped by the fixing nut 35 and sandwiched by the pipe member 28, and the cylindrical member 29 is connected to the outer fitting surface and the fixing screw 34. By being electrically connected to the substrate fixing member 17 and conducting to the shield case 23, an electromagnetic wave shield of the connector portion 10 is formed.
[0025]
(effect)
Although the signal cable 9 is securely fixed by the metallic shield layer 27 and the outer cover is separately fixed, the cable disconnection strength from the connector portion 10 can be greatly improved.
[0026]
5 to 7 relate to a second embodiment of the present invention, FIG. 5 is a cross-sectional view of the rear end portion of the camera head portion, and FIG. 6 is an enlarged view of a remote switch provided in the camera head portion of FIG. FIG. 7 is a diagram showing the configuration of the switch of FIG.
[0027]
Since the second embodiment is almost the same as the first embodiment, only different points will be described, and the same components are denoted by the same reference numerals and description thereof will be omitted.
[0028]
FIG. 5 is a cross-sectional view of the rear end of the camera head 8, and FIGS. 6 and 7 are enlarged views of the remote switch of the camera head.
[0029]
(Constitution)
A signal cable 9 is inserted through the connector side of the resin camera head exterior 101. The substantially cylindrical frame 102 made of metal forms an electromagnetic wave shield up to the vicinity of the image sensor (not shown) via each metal member.
[0030]
Reference numeral 103 denotes a pipe member interposed between the signal line 26 and the electromagnetic shield layer 27 in the vicinity of the fixed portion of the signal cable 9.
[0031]
Between the outer skin layer 23 and the electromagnetic shield layer 27, an interposed cylindrical member 104 is provided in the vicinity of the fixed portion of the signal cable 9. The cylindrical member 104 is coated with the electromagnetic shield layer 27 on the inner diameter on the front end side. A small-diameter step portion 105 in which the pipe members 10 3 are accommodated and a step portion 107 having a non-slip portion 106 covered with the outer skin layer 23 on the outer diameter on the rear end side.
[0032]
A groove 108 having a V-shaped cross section is formed in a part of the outer periphery of the cylindrical member 104 fitted to the inner periphery of the frame 102, and a pointed fixing screw 109 screwed into the frame 102 is engaged therewith. ing.
[0033]
The tip of the electromagnetic shield layer 27 is spread in a flange shape so as to be along the surface of the stepped portion 110 of the cylindrical member 104 and soldered.
[0034]
On the rear end side of the inner periphery of the frame 102, a step portion 111 having an inner diameter smaller than the outer periphery of the covering portion of the outer skin layer 23 covering the cylindrical member 104 is provided.
[0035]
A signal cable 9 and a packing 112 for waterproofing the frame 102 are provided on the inner periphery of the rear end of the frame 102, and the signal cable 9 is tightened by being compressed by a tightening nut 113.
[0036]
A rubber folding stop member 114 that covers and protects the outer periphery of the signal cable 9 is fitted on the outer periphery of the rear end portion of the frame 102, and a circumferential seal portion is provided between the rear end portion of the camera head exterior 101 and the frame 102. 115 is compressed and sandwiched.
[0037]
FIG. 6 is an enlarged view of the remote switch 300 (see FIG. 1) built in the camera head unit 8.
[0038]
In FIG. 6, a switch 302 is mounted on a flexible substrate 301 connected to the signal cable 9, and a button unit 304 for pressing the switch 302 is provided on the camera head exterior 303 at a position corresponding to the switch 302. Yes.
[0039]
The switch 302 has a structure in which a metal contact base 308 is embedded in a resin body 307, and the metal dome 305 is turned on and off when the metal dome 305 is uneven by pressing force. The opening of the resin body 303 is covered with a heat-resistant film 306 (FIGS. 7A and 7B are views as viewed from arrow B in FIG. 7A).
[0040]
(Function)
The rubber-made flexible outer skin layer 23 is pressed and sandwiched between a rear end portion of the cylindrical member 104 and a step portion 111 having an inner diameter of the frame 102 and fixed. Further, the slipping direction is also fixed by the anti-slip 106.
[0041]
The electromagnetic shield layer 27 is fixed to the cylindrical member 104 by soldering, and is fixed between the rear end portion of the pipe member 103 and the step portion 105 having the inner diameter of the cylindrical portion 104.
[0042]
The electromagnetic shield layer 27 is electrically connected to the cylindrical member 104 by being soldered and sandwiched between the pipe members 103, and is electrically connected to the frame 102 by the fixing screws 109, and the electromagnetic shield of the camera head unit 8 is It is formed.
[0043]
Further, the switch 302 presses the button unit 304 provided in the camera head portion, whereby the metal dome 305 of the switch 302 is pressed, and the electrically insulated portions of the metal contact base 304 are electrically connected to each other. The switch is turned on. The signal is sent to the processor 6 through the signal cable 9. Furthermore, the film 306 prevents solder flux from entering the switch 302 during mounting, and protects the metal contacts from moisture and the like that have entered the camera head unit 8.
[0044]
(effect)
Since the electromagnetic shield layer 27 is soldered to the cylindrical member 29, the conduction of the electromagnetic shield becomes more reliable.
[0045]
【The invention's effect】
As described above, according to the present invention, even when a relatively soft material is used for the outer skin, the resistance to disconnection of the cable from the main body portion or connector portion of the probe portion of the medical device is improved regardless of the thickness of the outer skin. There is an effect that can be made.
[Brief description of the drawings]
FIG. 4 is a block diagram showing a configuration of an endoscope observation system according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view showing a configuration of a connector portion in FIG. FIG. 4 is an enlarged view of the substrate fixing member of FIG. 2. FIG. 5 is a sectional view of the rear end of the camera head according to the second embodiment of the present invention. FIG. 7 is an enlarged view of a remote switch provided in the camera head portion of FIG. 5. FIG. 7 is a diagram showing the configuration of the switch of FIG.
DESCRIPTION OF SYMBOLS 1 ... Endoscopic observation system 2 ... Endoscope 3 ... Light source device 4 ... Light guide cable 5 ... Endoscope imaging device 6 ... Video processor 7 ... Monitor 8 ... Camera head part 9 ... Signal cable 10 ... Connector part 14 ... Connector exterior 15 ... Board 16 ... Land part 17 ... Board fixing member 18 ... Protruding part 19 ... Holding member 21 ... Electromagnetic shield case 22 ... Screw 23 ... Outer skin layer 24 ... Insertion hole 26 ... Signal line 27 ... Electromagnetic shield layer 28 ... Pipe member 29... Cylindrical members 30, 32, 36... Step portion 31. ... Seal part 43 ... Waterproof packing

Claims (5)

In the signal cable fixing structure for fixing the end of the signal cable, in which a signal line for transmitting a signal is sequentially covered with a conductive shield layer and a soft skin layer, to a predetermined fixing target,
A first tubular member that is inserted through the signal line and covered by the shield layer and interposed between the signal line and the shield layer;
A step portion for forming an inner diameter portion smaller than an outer diameter of the covering portion of the shield layer in order to engage with the covering portion of the shield layer covering the first tubular member; A second tubular member interposed between the shield layer and the outer skin layer so that the shield layer can be sandwiched between the tubular member and the stepped portion;
A protrusion having an inner diameter smaller than the outer diameter of the covering portion of the outer skin layer for engaging with the covering portion of the outer skin layer covering the second tubular member; and the second tubular member and the protrusion And a third tubular member that covers the covering portion of the outer skin layer so that the outer skin layer can be sandwiched between the first and second portions. It further has a shield layer fixing member fixed to the second tubular member so as to sandwich the end portion of the shield layer widened in a flange shape between the end surface of the second tubular member. The signal cable fixing structure according to claim 1. The signal cable fixing structure according to claim 1, wherein the second tubular member and the shield layer are soldered. 2. The signal cable fixing structure according to claim 1, wherein the second tubular member has an engaging portion for engaging with a screw fixed to the third tubular member. 5. The signal cable fixing structure according to claim 4, wherein an amount of force for tightening the outer skin layer between the second tubular member and the third tubular member is adjusted by the advancement and retraction of the screw.

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