JP3955475B2 - Electromagnetic noise removal device for electronic endoscope - Google Patents

Description

[0001]
【Technical field】
The present invention relates to an electromagnetic noise removing device for an electronic endoscope.
[0002]
[Prior art and its problems]
In an electronic endoscope, a CCD cable for forming an image by an objective optical system at the distal end portion of the insertion portion of the endoscope on the CCD and transmitting the image signal to an external video processor, Signal transmission cables such as remote cables connected to various switch devices provided in the operation unit are used. Conventionally, various measures have been taken to remove radiated electromagnetic noise from these signal transmission cables.
[0003]
4 and 5, a shield case 110 is provided in a connector body 105 located at the distal end of a universal tube of an endoscope, and an electromagnetic noise removing core 113 made of a magnetic material is provided in the shield case 110. An example is shown. The electromagnetic noise removal core 113 has a cable insertion hole 113a, and the electromagnetic noise is removed by inserting the signal transmission cables 106 and 112 in the universal tube into the cable insertion hole 113a. The electromagnetic noise removing core 113 is fixed in the shield case 110 by being screwed in a state of being inserted (fitted) into the core holding substrate 200 having a U-shaped cross section fixed to the shield case 110. .
[0004]
Incidentally, in recent years, in order to further reduce the size of the endoscope, the space between various parts provided in the endoscope has been narrowed. This is no exception in the shield case 110, and it is very difficult to screw the electromagnetic noise removal core 133 to the core holding substrate 200 already incorporated in the shield case 110 in a narrow space.
[0005]
Further, since the core holding substrate 200 has a U-shaped cross section in which the insertion port of the electromagnetic noise removal core 113 is opened, when the screw 201 for fixing the electromagnetic noise removal core is loosened, the electromagnetic noise is removed from the insertion port. The removal core 113 may fall off.
[0006]
OBJECT OF THE INVENTION
An object of the present invention is to obtain an electromagnetic noise removing device for an electronic endoscope that facilitates the work of mounting an electromagnetic noise removing core and prevents the electromagnetic noise removing core from falling off, based on the above problem awareness.
[0007]
SUMMARY OF THE INVENTION
The present invention includes a connector portion body that is attached to and detached from a video processor and is provided at a distal end portion of a universal tube that includes a signal transmission cable and extends from an operation portion; and an insertion hole through which the signal transmission cable is inserted. And an electromagnetic noise removing core made of a magnetic material provided in the connector portion main body. An electromagnetic noise removing device for an electronic endoscope having a shield case provided in the connector portion main body, and the shield case And a core holding substrate fixed to the fixed substrate, the core holding substrate being in close contact with and fixed to the fixed substrate, and the core holding substrate. An enclosure wall that rises from a close-contact wall and inserts the electromagnetic noise removal core and contacts the electromagnetic noise removal core, and the enclosure wall and the fixed wall Keeping clipping the electromagnetic noise elimination core plates, and said signal transmitting cable, that is wound on the electromagnetic noise removing the cores holding the substrate, is characterized in.
[0008]
The electromagnetic noise removal core is generally composed of a pair of halved cores having a substantially rectangular parallelepiped shape as a whole, and the surrounding wall of the core holding substrate has a substantially rectangular shape corresponding to the substantially rectangular parallelepiped electromagnetic noise removal core. It is good to form in a letter type section.
[0009]
The signal transmission cable is a CCD cable that transmits an image signal by the objective optical system at the distal end portion of the body insertion portion or a remote cable that transmits operation signals from various switch devices of the operation portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, an electronic endoscope 1 of this embodiment includes a flexible distal end side body insertion portion 2, a base operation portion 3, and a universal tube 4 extended from the operation portion 3. And a connector body 5 provided at the tip of the universal tube 4. The connector unit body 5 is connected to a video processor (not shown). An image signal imaged on a solid-state imaging device such as a CCD (charge coupled device) by the objective optical system of the in-vivo insertion section 2 is converted into a digital signal, and the in-body insertion section 2, the operation section 3, the universal tube 4 and the connector section main body. 5 is transmitted to the video processor via the CCD cable 6 (FIGS. 2 and 3) inserted through the cable 5. A remote cable 12 that is connected to various switch devices provided in the operation unit 3 and transmits an operation signal is also inserted into the operation unit 3, the universal tube 4, and the connector unit body 5.
[0011]
As shown in FIGS. 2 and 3, the connector portion main body 5 includes an outer case 9 made of a synthetic resin that forms an outer shell, and a shield case (a metal case for electromagnetic noise shielding) 10 positioned in the outer case 9. Have. The outer case 9 and the shield case 10 are provided with attachment ports 9a and 10b for connection plugs 8 connected to the video processor. A base end portion of a connection plug 8 for power supply and signal transmission to the CCD driver substrate 11 is inserted into the attachment ports 9a and 10b. The connection plug 8 has a positive terminal 8a at the center and a cylindrical negative terminal 8b in the radial direction. The connection plug 8 is provided with an outer diameter plug case 24. The outer diameter plug case 24 is a metal plug case and also has a function as an electromagnetic noise shield. The outer diameter plug case 24 is inserted into the attachment port 9 a and is attached to the attachment port 10 b of the shield case 10 with a lock nut 26 via an insulating material 25.
[0012]
The outer case 9 has a mounting opening 9b for the light guide insertion plug 7 opened at a position spaced from the shield case 10, and the base of the light guide insertion plug 7 is fitted into the mounting opening 9b. It is attached with the lock nut 28 via. The light guide plug 7 is provided with a holding hole 7a that reaches the tip from the base side. The light guide fiber bundle 29 guided into the connector body 5 is held in the holding hole 7a in the light guide insertion plug 7 and inserted to the tip. A light guide lens 30 is incorporated at the tip of the light guide plug 7.
[0013]
The video processor is provided with a connection socket corresponding to the connection plug 8 and the light guide insertion plug 7 and a light guide insertion socket. When the connection plug 8 and the corresponding socket are connected, the CCD cable 6 and the remote cable 12 are connected. Is connected to the video processor. When the light guide plug 7 is connected to the corresponding socket, the tip is connected to a light source unit (not shown) in the video processor.
[0014]
In the shield case 10, a CCD driver board (electronic circuit) 11 that scans the CCD and captures an image as a digital signal and amplifies a minute signal from the CCD and outputs the amplified signal to a video processor, and both cables 6 , 12 and an electromagnetic noise removing core 13 made of a magnetic material for removing electromagnetic noise. The shield case 10 houses the CCD substrate 11 and the electromagnetic noise removal core 13 and then is covered with a metal cover 14 that forms a part of the shield case 10 to shield the electromagnetic noise generated from the CCD driver substrate 11 (shield). ). The shield case 10 is formed with an opening 10 a for drawing the CCD cable 6 and the remote cable 12.
[0015]
The outer case 9 of the connector unit body 5 is provided with a suction nipple 20, an air / water supply port 21, a return terminal 22, and a pressure control valve 23 (see FIGS. 1 and 3). The suction nipple 20 is connected to an external suction mechanism (not shown). The suction nipple 20 and the suction channel inlet (not shown) at the distal end of the body insertion portion 2 are the universal tube 4, the operation portion 3, and the body insertion portion 2. Are connected by a suction line that passes through. The air / water supply port 21 is connected to an external air / water supply source. The air / water supply port 21 and the air / water supply nozzle provided at the distal end of the body insertion portion 2 are the universal tube 4 and the operation unit. 3 and an air / water supply conduit that passes through the body insertion portion 2. The air / water supply nozzle is a cleaning nozzle for cleaning the observation window at the distal end of the in-body insertion portion 2. The feedback terminal 22 is provided to ensure safety when using a treatment instrument that uses high-frequency power, such as an electric knife. The pressure control valve 23 is an adjustment valve provided to equalize the pressure inside the endoscope and the outside of the endoscope, and is operated when performing EOG sterilization or autoclave sterilization, for example.
[0016]
The electromagnetic noise removal core 13 made of a magnetic material is composed of a pair of half cores 13H. When paired, the pair of half cores 13H form a rectangular parallelepiped shape as a whole and form a cable insertion hole 13a at the center (shaft) thereof. The pair of half cores 13 </ b> H is fixed in the shield case 10 by the fixed substrate 15 and the core holding substrate 16. The core holding substrate 16 in this embodiment is used for fixing two sets of electromagnetic noise removing cores 13, and a close contact wall 16 b that is in close contact with the fixed substrate 15 is formed at the center, and this close contact wall 16 b. A pair of surrounding walls 16a bent in a U-shaped cross section are formed on the left and right sides of the frame. When the adhesion wall 16b is brought into contact with the fixed substrate 15 and fixed with the screws 17 in a state where the electromagnetic noise removing core 13 is inserted into the pair of surrounding walls 16a, the electromagnetic noise removing core 13 is placed in the surrounding wall 16a, the fixed substrate 15 and the like. It is pinched and held between.
[0017]
The electromagnetic noise removal core 13 is fixed in the shield case 10 as follows, for example. First, two sets of electromagnetic noise removing cores 13 each of which is a combination of a pair of half cores 13H are inserted into a pair of surrounding walls 16a of the core holding substrate 16 and screwed to the core holding substrate 16 with screws 18. Next, the CCD cable 6 and the remote cable 12 are sequentially inserted into the cable insertion holes 13 a of the two sets of electromagnetic noise removing cores 13 and wound around the core holding substrate 16 and the electromagnetic noise removing cores 13. After the CCD cable 6 and the remote cable 12 are wound around the electromagnetic noise removing core 13 and the core holding substrate 16, the core holding substrate 16 is in close contact with the electromagnetic noise removing core 13 in the surrounding wall 16a in contact with the fixed substrate 15. The wall 16 b is screwed to the fixed substrate 15 with screws 17. Next, the fixed substrate 15 is fixed to the shield case 10 with screws 19, and the electromagnetic noise removal core 13 is fixed in the shield case 10.
[0018]
As described above, since the electromagnetic noise removing core 13, the core holding substrate 16, and the fixed substrate 15 are integrated into the shield case 10 as a unit, the electromagnetic noise removing core 13 is attached to the core holding substrate 16 using the fixed substrate 15. When being attached, the electromagnetic noise removing core 13 can be easily attached without being obstructed by the shield case 10 or the like. Further, since the electromagnetic noise removing core 13 is sandwiched and held between the surrounding wall 16a of the core holding substrate 16 and the fixed substrate 15, the electromagnetic noise removing core 13 is separated from the core holding substrate 16 even if the screw 18 is loosened. It can be prevented from falling off.
[0019]
In the above embodiment, the fixed substrate 15 is configured to be located in the shield case 10, but a part of the shield case 10 may be used as the fixed substrate. Further, although two surrounding walls 16a for the electromagnetic noise removing core 13 are provided on the core holding substrate 16, one may be provided, and the number of the surrounding walls 16a may be set arbitrarily. Further, although the CCD cable and the remote cable are used as the signal transmission cable, other signal transmission cables may be used.
[0020]
【The invention's effect】
As described above, according to the present invention, an electromagnetic noise removing device for an electronic endoscope that facilitates the work of attaching an electromagnetic noise removing core and prevents the electromagnetic noise removing core from falling off the core holding substrate is obtained. be able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing an overall application of the present invention to an electronic endoscope.
FIG. 2 is a cross-sectional view showing a connector portion main body attached to a distal end portion of a universal tube of an electronic endoscope.
FIG. 3 is a longitudinal sectional view showing a connector part body attached to a distal end part of a universal tube of an electronic endoscope.
FIG. 4 is a cross-sectional view showing an example of a connector section body having a conventional structure.
5 is a longitudinal sectional view showing the connector section main body of FIG. 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electronic endoscope 2 Internal body insertion part 3 Operation part 4 Universal tube 5 Connector part main body 6 CCD cable 10 Shield case 12 Remote cable 13 Electromagnetic noise removal core 13H Half core 13a Cable insertion hole 15 Fixed board 16 Core holding board 16a Surrounding Wall 16b Adherence wall

Claims (3)

A connector main body which is provided at a distal end portion of a universal tube which includes a signal transmission cable and extends from an operation portion; and a connector portion which is attachable to and detachable from a video processor; an insertion hole through which the signal transmission cable is inserted; An electromagnetic noise removing core for an electronic endoscope, comprising: an electromagnetic noise removing core made of a magnetic material provided in a main body of the head;
A shield case provided in the connector body, a fixed substrate constituting a part of the shield case or positioned in the shield case, and a core holding substrate fixed to the fixed substrate ;
The core holding substrate has an adhesion wall that is fixed in close contact with the fixed substrate, and an enclosing wall that rises from the adhesion wall, contacts the electromagnetic noise removal core by inserting the electromagnetic noise removal core, Sandwiching and holding an electromagnetic noise removal core between the surrounding wall and the fixed substrate; and
The signal transmission cable is wound around an electromagnetic noise removal core and a core holding substrate;
An electromagnetic noise removing device for an electronic endoscope characterized by the above. 2. The electromagnetic noise removing device for an electronic endoscope according to claim 1, wherein the electromagnetic noise removing core is composed of a pair of halved cores having a substantially rectangular parallelepiped shape as a whole, and the surrounding wall of the core holding substrate is the substantially rectangular parallelepiped. An electromagnetic noise removing device for an electronic endoscope having a substantially U-shaped cross section corresponding to an electromagnetic noise removing core. 3. An electromagnetic noise removing apparatus for an electronic endoscope according to claim 1 or 2, wherein the signal transmission cable is a CCD cable for transmitting an image signal by an objective optical system at a distal end portion of the body insertion portion or various switch devices of the operation portion. An electromagnetic noise removal device for an electronic endoscope, which is a remote cable that transmits the operation signal.

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