JP2003190086A - Shield structure of electronic endoscope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain the shield structure of an electronic endoscope capable of preventing the leakage of radiation noise from a connector part main body. <P>SOLUTION: The shield structure of the electronic endoscope is equipped with a connector part main body 6 provided to the leading end of a universal tube extended from an endoscope operation part and detachable with respect to a video processor, 5 a shield case 8 which has an envelopment part 80 and a projected part 81, positioned in the outer case 7 of the connector part main body 6, an electronic circuit (14) positioned within the envelopment part 80 of the shield case 8 and a light guide insertion plug 23 projected from the connector part main body 6 and having a light guide fiber bundle 25 provided therein. The light guide fiber bundle 25 is not passed through the envelopment part 80 of the shield case 8 (but passed trhough the projected part 81 of the shield case 8) and guided to the light guide insertion plug 23 from the universal tube. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a shield structure for an electronic endoscope.

[0002]

2. Description of the Related Art In an electronic endoscope, an image formed by an objective optical system of the endoscope is formed on a CCD and the image signal is transmitted to an external video processor via a CCD cable, or a light source. The light emitted from the unit is transmitted through the light guide fiber bundle to the tip of the insertion part of the endoscope. For this reason, a connector section is provided at the tip of the universal tube extended from the endoscope operation section, and a connector for connecting to the video processor and a light guide insertion plug for illumination connected to the light source unit are provided at this connector section. There is. The light source unit is often included in the video processor.

In general, the connector section is provided with a CCD driver board which functions to scan the CCD to capture an image as a digital signal and to amplify a minute signal from the CCD and output it to a video processor. Therefore, a shield case (a metal case for radiation noise shield) that shields the electromagnetic noise of the CCD driver board is arranged in the connector portion, and the electromagnetic noise generated from the CCD driver board leaks to the outside of the connector portion. Was prevented.

On the other hand, the light guide fiber bundle connected to the light guide insertion plug as described above is guided to the connector portion. Conventionally, this light guide fiber bundle has been connected to a light guide insertion plug through a shield case provided in the connector section. That is, it is technical common sense to provide a shield case in the connector portion, and it is also technical common sense to pass the light guide fiber bundle through this shield case. However, in order to pass the light guide fiber bundle through the shield case, an insertion hole for the light guide fiber bundle must be formed in the shield case, and there is no reason to magnetically shield the light guide fiber bundle. The fiber insertion hole formed in the shield case obviously deteriorates the electromagnetic noise shield performance.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to obtain a shield structure for an electronic endoscope capable of improving the electromagnetic noise shield characteristics of the endoscope connector section.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a connector main body which is provided at a distal end portion of a universal tube extended from an operating portion of an endoscope and which is attached to and detached from a video processor; located inside an outer case of the connector main body. Shield case;
An electronic circuit located in the shield case; and a light guide insertion plug having a light guide fiber bundle therein, which is protruded from the connector body, and the light guide fiber bundle is provided in the connector body. The feature is that the light is guided from the universal tube to the light guide plug without passing through the shield case.

As described above, by locating the light guide fiber bundle guided to the light guide insertion plug outside the shield case, it is not necessary to form an insertion hole for the light guide fiber bundle in the shield case, and the light guide fiber bundle can be removed from the shield case. It is possible to more reliably prevent the leakage of electromagnetic noise to the outside.

It is preferable that the shield case has a protrusion along the inner surface of the outer case of the connector body, and the light guide insertion plug is supported by the protrusion and the outer case of the connector body. More specifically, it is preferable that the shield case has an enclosing portion that encloses the electronic circuit and a protruding portion that protrudes from the enclosing portion, and that the protruding portion supports the light guide insertion plug. . If the light guide insertion plug is supported by both the outer case and the protrusion of the shield case in this manner, the effect of increasing the force for supporting the light guide insertion plug can be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an electronic endoscope 1 of this embodiment has a flexible distal end side body-inserted portion 2, a base operation portion 3 and this operation portion 3. It has a universal tube 4 extended from and a connector body 6 provided at the tip of the universal tube 4. An objective optical system (not shown) is provided at the tip of the body insertion portion 2, and an image obtained by the objective optical system is converted into a digital signal by a solid-state image sensor (for example, CCD (charge coupled device)). This digital signal is the CCD inserted through the body insertion section 2, the operation section 3 and the universal tube 4.
It is guided to the connector body 6 via the cable 17 (see FIG. 2). Further, an illumination window (not shown) is provided at the tip of the body insertion portion 2, and the light guide fiber bundle 26 (see FIG. 2) that transmits illumination light to the illumination window is
It is inserted into the body insertion part 2, the operation part 3 and the universal tube 4 and guided to the connector part body 6.

The connector body 6 has a connection plug 19 connected to the video processor 5 and a video processor 5.
A light guide insertion plug 23 connected to a light source unit (not shown) therein is formed to project. The video processor 5 is provided with a connection plug corresponding to the connection plug 19 and the light guide insertion plug 23 and a light guide insertion plug (both not shown).

As shown in FIGS. 2 and 3, the connector body 6 is made of a synthetic resin outer case 7 forming an outer shell.
And a shield case (radiation noise shield metal case) 8 located inside the outer case 7.
The shield case 8 has a substantially square surrounding portion 80 and a protruding portion 8 formed by protruding downward from the surrounding portion 80 in FIG.
It consists of 1. A CCD driver board (electronic circuit) 14, which functions to scan the CCD to capture an image as a digital signal and to amplify a minute signal from the CCD and output the amplified signal to the video processor 5, the CCD cable 17, and The magnetic core 13 for removing electromagnetic noise generated from the remote cable 18 is provided. The magnetic core 13 is made of a magnetic material. The remote cable 18 is connected to various switch devices provided in the operation unit 3. The surrounding portion 80 is formed with an opening 8a through which the CCD cable 17 and the remote cable 18 are inserted. After the CCD driver substrate 14 and the magnetic core 13 are housed inside, the surrounding portion 80 is covered and sealed with a metal cover 15 that forms a part of the shield case 8. Therefore, the electromagnetic noise generated from the CCD driver board 14 does not leak from the shield case 8 (enclosure 80).

The magnetic core 13 has a through hole 13a and is supported in the shield case 8 via a metal plate 16. The through hole 13a of the magnetic core 13 is wound once with a CCD cable 17 and a remote cable 18 which are extended by being inserted into the universal tube 4 from the body insertion portion 2 side of the endoscope.
The end of the remote cable 18 is connected to the terminal of the CCD driver board 14.

In the outer case 7 of the connector body 6,
A suction nipple 9, an air / water supply port 10, a return terminal 11, and a pressure control valve 12 are provided (see FIGS. 1 and 2). The suction nipple 9 is connected to an external suction mechanism (not shown), and the tip portion of the suction nipple 9 is inserted into the universal tube 4, the operating portion 3 and the body insertion portion 2, and the suction channel (not shown) of the tip portion of the body insertion portion 2 is inserted. It is connected to the. The air / water supply port 10 is connected to an external air / water supply source,
Similarly, the tip portion thereof is inserted into the universal tube 4, the operating portion 3 and the body insertion portion 2 and serves as an air / water feeding nozzle facing the observation window (objective lens) surface of the objective optical system at the tip portion of the body insertion portion 2. It is connected. The feedback terminal 11 is provided to ensure safety when using a treatment instrument that uses high-frequency power, such as an electric knife. The pressure control valve 12 is
A regulating valve provided for equalizing the pressure inside the endoscope and the pressure outside the endoscope, and is operated when, for example, EOG sterilization or autoclave sterilization is performed.

Attachment ports 7a and 8b for the connection plug 19 and the plug case 20 are formed in the surrounding portions 80 of the outer case 7 and the shield case 8 respectively. The connection plug 19 has a + terminal 19a at the center and a cylindrical-terminal 19b insulated in the radial direction. The plug case 20 has a screw 22 via an insulating material 21.
Is attached to the attachment opening 8b of the shield case 8.
In this embodiment, the plug case 20 is also provided with a shield function for shielding electromagnetic noise.

On the other hand, the outer case 7 and the shield case 8
The protrusion 81 has mounting openings 7b and 8c for the light guide plug 23, respectively. The base portion of the light guide insertion plug 23 has a mounting port 7
By being screwed with the screw 25 through the insulating material 24 while being fitted in the b and 8c, the outer case 7 and the shield case 8 are supported by the protruding portion 81. When the light guide insertion plug 23 is thus supported by both the outer case 7 and the shield case 8 (protruding portion 81), the light guide insertion plug 23 is supported more than the case where the light guide insertion plug 23 is supported only by the outer case 7. Plug 2
The effect of increasing the force for supporting 3 is also obtained.

The light guide insertion plug 23 has a holding hole 23a which extends from the base side to the tip.
The light guide fiber bundle 26 guided into the connector body 6 is held in the light guide plug 23 without passing through the surrounding portion 80 of the shield case 8 (that is, through the protruding portion 81 of the shield case 8). Hole 23
It is held inside a and is inserted up to the tip of the light guide insertion plug 23. Light guide plug 23
A light guide lens 27 is incorporated at the tip of the light guide fiber bundle 26, and the light guide fiber bundle 26 is connected to a light source unit (not shown) on the video processor 5 side via the condenser lens 27.

The video processor 5 includes a connection plug 19
And a light guide insertion plug 23 and a connection plug corresponding to the light guide insertion plug 23 and a light guide insertion plug (not shown) are provided. When the connector main body 6 is connected to the video processor 5, the connection between the connection plug 19 and these plugs is completed. Then, the light from the light source unit is guided to the illumination window, and the image signal from the objective optical system is guided to the video processor 5 through the connector body 6.

As described above, in this embodiment, the light guide fiber bundle 26 is not inserted into the surrounding portion 80 of the shield case 8. That is, the surrounding portion 80 of the shield case 8 is not formed with an insertion hole corresponding to the light guide insertion plug 23. For this reason, electromagnetic noise does not leak from the surrounding portion 80 of the shield case 8, and it is possible to prevent electromagnetic noise from leaking to the outside of the connector body 6.

In this embodiment, the CCD driver substrate is used in correspondence with the CCD for converting the image by the objective optical system into an electric signal. However, when an element replacing the CCD is used, the CCD is used. It goes without saying that an electronic circuit is used instead of the driver board.

[0020]

As described above, according to the present invention, it is possible to obtain a shield structure for an electronic endoscope capable of preventing leakage of electromagnetic noise from the connector body.

[Brief description of drawings]

FIG. 1 is an overall view showing an electronic endoscope to which the present invention has been applied.

FIG. 2 is a vertical cross-sectional view showing a connector body provided at the tip of a universal tube.

3 is a sectional view taken along line III-III in FIG.

[Explanation of symbols]

1 Electronic endoscope 4 universal tubes 5 video processor 6 Connector body 7 Outer case 8 shield case 14 CCD driver board (electronic circuit) 19 Connection plug 23 Light guide plug

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) H04N 5/225 H04N 5/225 C

Claims (3)

[Claims] 1. A connector unit main body, which is attached to and detached from a video processor, which is provided at a distal end of a universal tube extended from an operation unit of an endoscope; a shield case which is located in an outer case of the connector unit main body. An electronic circuit located in the shield case; and a light guide insertion plug having a light guide fiber bundle therein, the light guide plug protruding from the connector body, and the light guide fiber bundle in the connector body. The shield structure of the electronic endoscope is characterized in that it is led from the universal tube to the light guide insertion plug without passing through the shield case of. 2. The shield structure for an electronic endoscope according to claim 1, wherein the shield case has a protrusion along the inner surface of the outer case, and the light guide is inserted into the protrusion and the outer case of the connector body. A shield structure for an electronic endoscope in which a plug is supported. 3. The shield structure for an electronic endoscope according to claim 2, wherein the shield case has an enclosing portion enclosing the electronic circuit and a protruding portion protruding from the enclosing portion. A shield structure for an electronic endoscope in which the light guide insertion plug is supported by a section.