JPH01137219A - Connector for electronic endoscope - Google Patents

Abstract

PURPOSE:To eliminate the leakage of electromagnetic shield and to prevent the radiation of an electromagnetic wave by connecting almost the whole periphery of a tube-like shield wire which has covered a signal conductor inserted through in a cable of an electronic endoscope. CONSTITUTION:As for an electronic endoscope, an operating part having a large diameter is connected to the rear end of an inserting part being slender, and for instance, having flexibility, and to the side of this operating part, the first cable is extended out. Also, on an intermediate connector, a second cable 9 in which a signal conductor is extended and provided internally is provided. On the tip of this second cable 9, a plug 11 is provided, and fitted into a receptacle 20 provided on a panel 4a of a controller. When the plug 11 and the receptacle 20 are fitted and connected in such a way, a contact ring 16 of the plug 11 is energized by a ring spring 18 of the back and pressed against the end face of a detaining part 21b, the plug 11 and the receptacle 20 come into contact as the whole periphery, and also, in a wide contact area, and the connecting part is brought to electromagnetic shield completely.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connector device for an electronic endoscope that takes electromagnetic shielding measures.

[Problems to be solved by conventional techniques and inventions] In recent years,
BACKGROUND ART Endoscopes have come into wide use because they can diagnose internal organs in a body cavity by inserting an elongated insertion portion into the body cavity, and can perform therapeutic treatment using a treatment instrument if necessary.

Furthermore, endoscopes are used not only for medical purposes but also for industrial purposes to observe and inspect objects inside pipes of boilers, machines, chemical plants, etc., or inside equipment.

Furthermore, various electronic endoscopes have been proposed that use a solid-state 11D imager, such as a charge-coupled device (COD), as an imaging means.

Generally, a signal cable having a connector device at its tip extends from the operating section of the electronic endoscope, and the connector device is connected to a control device. For example, Japanese Patent Laid-Open No. 60-8429 discloses that an endoscope is connected to a control device with a built-in light source via a connector device, and the illumination light from the light source illuminates the inside of a body cavity. , illustrates a technique for displaying, for example, an observed image inside a body cavity on a monitor, which is obtained by a solid-state image carrier.

By the way, although high-frequency signals are used in the electronic endoscope and its control device, it is necessary to control the emission of unnecessary electromagnetic waves in order to prevent negative effects caused by electromagnetic waves on peripheral devices. Conversely, it is necessary to block electromagnetic noise from peripheral devices from being superimposed on signals from the endoscope and its control equipment. Therefore, both the electronic endoscope and the Ti + control device are covered with metal.

However, this connector device, which electrically connects an electronic endoscope with electromagnetic shielding measures and a control device with electromagnetic shielding measures, requires connection continuity between the corresponding electrical contacts and connection between the main bodies at the outer periphery. Although the connection is fixed mechanically, there are systems that actively connect the electromagnetic shielding metal on the electronic endoscope side and the electromagnetic shielding on the control device side while maintaining the electromagnetic shielding effect. do not. In this way, in the connector device part that electrically connects the electromagnetically shielded electronic endoscope side and its control device side, if there is no continuity between the electromagnetic shield metals, the electronic endoscope side and the control device side There is a problem that a difference occurs in the potential between the two connectors, electromagnetic waves are radiated from the non-electromagnetic shielded portion of the connector device, or external electromagnetic noise is superimposed.

The present invention has been developed in view of these circumstances, and aims to provide a connector device for an electronic endoscope that can prevent the radiation of electromagnetic waves at the connector device site and the superimposition of external electromagnetic noise. It is said that

[Means for solving problems and their effects] jiff
In order to achieve the above object, the electronic endoscope connector assembly 6 according to the present invention connects almost the entire circumference of the Chicove-shaped shielded wire that covers the signal wire that is inserted into the cable of the electronic endoscope.
On the other hand, the plug is equipped with a conductive member that surrounds the internal contact pins and the signal line extending from inside the cable, and is connected almost all the way around the electromagnetically shielded control device body. A receptacle having an 8S lightning conductor surrounding a contact pin provided therein, and a contact member that brings the conductive members of the plug and receptacle into contact over substantially the entire circumference and with a sufficiently low impedance when the plug and the receptacle are connected. It is composed of

With this configuration, when connecting the plug and receptacle,
At the contact member, substantially the entire circumferences of both conductive members are in contact with each other at a sufficiently low impedance, thereby preventing radiation of electromagnetic waves from the connector portion and superimposition of external electromagnetic noise on signals passing through the signal line and contact pin.

[Embodiments] Hereinafter, embodiments of the connector device according to the present invention will be described with reference to the drawings.

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure is a cross-sectional view showing the plug and receptacle connected, Figure 2 (A) is a cross-sectional view of the plug, Figure 2 (B) is a perspective view of the ring spring, Figure 3 is a cross-sectional view of the receptacle, and Figure 4 The figure is a cross-sectional view taken along the line A- in FIG. 3, FIG. 5 is a view taken along the 8-direction arrow in FIG. .

As shown in FIG. 6, the endoscope device 1 includes, for example, an electronic endoscope 2.
, a light source device 3 , a control device 4 , and a CRT monitor 5 connected to the control device 4 .

The electronic endoscope m2 has a large-diameter operating section 2b connected to the rear end of an elongated, e.g., flexible insertion section 2a, and a flexible, e.g. However, a first cable 7 in which an optical transmission means, a signal line, etc. are installed is extended. An intermediate connector 8 is provided at the tip of the first cable 7, and one end of the light transmission means is connected to a lighting connector formed on the intermediate connector 8.

The lighting connector of the intermediate connector 8 is the lighting device 3.
The illumination light from a light source (not shown) installed in the illumination device 3 is transmitted to the electronic inner chain 2 through the light transmission means. .

Further, the intermediate connector 8 is provided with a second cable 9 which is an extension of the signal line. A plug 11 is disposed at the tip of the second cable 9, and is fitted into a receptacle 20 provided on the panel 4a of the control device 4, so that the control signal from the control device 4 is transmitted to the signal line The image carrier signal is transmitted to the electronic endoscope 2 via the electronic endoscope 2, and the image carrier signal from the electronic endoscope 2 is transmitted to the control device 5 via signal lines within these cables 7.9. Incidentally, the plug 11 and the receptacle 2° constitute a connector device according to the present invention.

As shown in FIGS. 1 and 2, the plug 11 has a male shell 12a with a slightly narrower diameter by opening the tip of a plug body 12, which is a conductive member made of metal, etc., and is connected to the rear end. This through hole 12 has a through hole 12b.
The end of the second cable 9 is fitted and connected to b. The signal line 13 inserted into this cable 7.9 extends into the plug body 12, and this coupler 9.
A tubular electromagnetic shield wire 14 that covers the signal wire 13 inside is also inserted into the plug body 12 through the through hole 12b, and the electromagnetic shield wire 14 expands in a trumpet shape inside the plug body 12. It comes into contact with the inner wall of the plug body 12 and is fixed with screws, and its entire circumference is connected to the plug body 12. On the other hand, a male insulator 16' having a plurality of male contact pins 15 is installed inside the male shell 12a of the plug body 12, and the signal wire 13 extending into the plug body 12 is connected to these male contact pins 15. is connected. A contact ring 16 made of a conductive material is disposed on the rear outer periphery of the male shell 12a so as to be able to move slightly in the axial direction. (It is located between the stopper 17 and the ring spring 18 disposed on the curved side of the rear step portion 12c of the male shell 12a (I). This ring spring 18 has a large number of notches as shown in FIG. 2(B). Raise the contact ring 16 with the leaf spring 18a to the lever 2.
They are so attached to each other that they move in the 0 direction. Roughly speaking, a positioning pin 91 that is engaged when connected to the receptacle 12 is provided protrudingly on the outer periphery of the male shell 12a and in front of the contact ring 16.

On the other hand, the receptacle 2 provided in the control device 4
As shown in FIGS. 1 and 3, reference numeral 0 denotes a fixed shell 2 as a conductive member made of metal or the like formed in a cylindrical shape on a panel 4a having 3!1 conductivity, such as metal or the like of this control device 4.
1 is inserted and fixed therein, and a rotating shell 22 as a rotating member, which is longer than the fixed frame 21, is rotatably engaged within the fixed shell 21.

Front end portion 21 of the fixed shell 21 on the front side of the panel 4a
A locking portion 21b that protrudes inwardly of the fixed shell 21 is provided in a ring, and the tip 22a of the rotating shell 22 is in contact with the locking portion 21b, while the inside of the panel 4a A groove 22b is provided on the outer periphery of the rotary shell 18 corresponding to the rear end surface 21C of the fixed shell 21, and a handling plate 23 that is engaged with the groove 22a is fixed to the rear end surface 21G. The rotating shell 22 is rotatably positioned by the locking portion 21a and the l&Ih plate 23.

Further, the plug 11 is disposed in the axial direction of the rotary shell 22.
A hole 22G having substantially the same diameter as the male shell 12a is formed, and a female insulator 24 is fixed to this hole 22G. A female contact pin 25 as a first contact, which is engaged with the male contact pin 15, is fixed to the female insulator 2/I parallel to the axis of the receptacle 20, and this ml! A conductive line 25a is connected to each i-contact pin 25.

Further, the tip portion 22a of the rotary shell 22 and the locking portion 21b of the fixed shell 21 are matched only when the rotary shell 22 is rotated to a predetermined IQ angle, and the plug 11 Grooves 21d and 22 for storing the positioning pin 19
d are carved in the axial direction, and these full 21
When 6.22d is matched, the male shell 121) of the plug 11 is fitted into the hole 22c of the rotating shell 22, and the male contact pin 15 and the female contact pin 25 are mechanically and electrically connected. has been done.

A hole 26 is provided in the inner circumferential surface of the rotary shell 22 and passes through the inner circumferential surface side of the fixed shell 21, and a lever 27a serving as a locking piece is provided in the hole 26, and the central portion thereof is pivoted by a pin 27b. has been done. One end of this lever 27a is
It has a first protrusion 27C that protrudes into the space between the outer circumferential surface of the female insulator 24 and the rotary shell 22 within the hole 22c, and the other end has a first protrusion 27C that is located inside the hole 22c.
A hole 27 provided in the inner peripheral surface of the fixed shell 21 corresponding to
d1. :B? Rotating shell 2 is connected between second protrusion 27e and the back side (anti-contact side) of female insulator 24 so that it can be fitted.
A third protrusion 27f protruding from the inner circumferential surface of 2 is provided. Further, a leaf spring 27g provided on the end surface of the rotary shell 22 on the side opposite to the plug is biased to come into contact with the third protrusion 27r.

The position of the hole 27d is set so that the second protrusion 27e will fit in when the hole 27d formed in the fixed shell 21 matches the groove 22d formed in the rotating shell 22. It is set in.

Further, a switch 28 for turning on/off the conduction of the female contact pin 25 to the conduction line 25a is fixed to the rear end surface 21c of the fixed shell 21, while a switch 28 is fixed to the rear end surface 21c of the rotary shell 22. A dog 29 is fixed to a portion rearward of the rear end surface 21c of the shell 21, which causes the switch 28 to be pressed to perform a Δ-turn operation when the rotary shell 22 is rotated by a predetermined angle. On the other hand, the rear end surface 21
C, and on the opposite side of the switch 28 with these two dogs in between, the l-flange 30 of this dog 29 is arranged J3, and the rotating shell 22 rotates in the opposite direction to the switch suppression direction. The movement is configured to be stopped by this stopper 30 at a position where the grooves 21d and 22d in which one of the positioning pins is accommodated match.

On the other hand, the rotating shell 2
A hole 31a is formed in the radial direction of the hole 31a.
The steel ball 31 can be freely protruded by the force of the elastic body 31b.
, c are inserted. - On the other hand, a plurality of recesses 21e and 21f are formed on the inner periphery of the fixed shell 21 corresponding to the steel ball 31c, and the steel ball 31c is engaged with the recess 21e. , 21f, the rotation of the rotating shell 22 is caused by i? 42
1d and the groove 22d coincide with each other, and the dog 29 is fixed at the part where the switch 28 is pressed. In addition, the hole 31a, the elastic body 31b, the steel ball 31c,
A click mechanism 31 is constituted by the recesses 21e and 21f.

Next, the operation of the connector device 13 having the above-described configuration will be explained.

When fitting the plug 11 and the receptacle 20 to connect the male and female contact pins 15 and 25, one positioning pin provided on the plug 11 is inserted into the receptacle by means such as grasping the plug 11. The male shell 12 of the plug 11 is inserted into the hole 22c of the rotating shell 22 in alignment with the groove 21d carved in the fixed shell 21 of No. 12 and the groove 226 carved in the tip 22a of the rotating shell 22.

The end surface of the inserted male shell 12a comes into contact with the first protrusion 27c protruding into the hole 22c as shown in FIG. The second protrusion 27c is pushed down into the hole 26, and the second protrusion 27e is retracted from the hole 27d provided in the fixed shell 21. Then, the positioning pin 19 passes through the groove 21d of the locking part 21b and is housed in )1"+?22d of the rotating shell 22, and the female insulator 24 of the receptacle 20 is inserted into the male shell 12a of the plug 11. When engaged, the plurality of male contact pins 15 are inserted into the female contact pins 25.

When the plug 11 and the receptacle 20 are fitted and connected in this way, the contact ring 16 of the plug 11 is urged upward by the ring spring 18 on the back side, and the end face of the locking part 21b of the tip part 21a of the fixed shell 21 of the receptacle 20 (flange-like abutting surface), the plug 11 and the receptacle 2
0 are in contact with each other all around the circumference and over a wide contact area, and eventually a conductive state is established with sufficiently low impedance, and this connection portion is completely electromagnetically shielded.

Here, the electronic endoscope side is shielded by an electromagnetic shielding gland 14, the plug 11 is shielded by a plug body 12 as a 1ffl member, and furthermore, the control device side is shielded by a metal W! The receptacle 20 is further provided with a fixed shell 21 as a conductive member by means of the conductive panel 4a.
The entire device is completely surrounded by the electromagnetic shielding member.

In this way, when the plug 11 and the receptacle 20 are fitted and connected, the male and female contact pins 15 and 25 are mechanically connected.
However, at this point, the switch 28 is not turned on, so for example, the female contact pin 25
No current is conducted to the contact pin 15.2, and when the contact pin 15.25 is connected, a temporary excessive current flows to the contact pin 15.2.
No current is generated during the 5-minute period, and this excessive current does not flow to the upstream or downstream sides of this connector device.

Next, the plug 11 is rotated in a predetermined direction by, for example, gripping the plug 11. As a result, the rotating shell 22 of the receptacle 20 is rotated within the fixed shell 21 with the male and female contact pins 15.25 mechanically connected. With this rotation, the steel ball 31C of the click mechanism 31 is biased by the inner circumferential surface of the fixed shell 21, and is disengaged from the four parts 21c of the inner circumferential surface of the fixed shell 21, and is influenced by the biasing force of the elastic body 31b. It is accommodated in the hole 31a against the resistance. Positioning pin 19 of the plug 11
Since the positioning pin 19 is housed in the full position 226 of the rotary shell 22, this positioning pin 19 does not interfere with the rotation of the rotary shell 22, and the positioning pin 19 does not interfere with the rotation of the rotary shell 22.
After the rotation, one of the above positioning pins is attached to the fixed shell 21.
By coming into contact with the locking portion 21b, the plug 11 is prevented from moving in the service direction.

When the rotary shell 22 is rotated by a predetermined angle in the direction of the arrow as shown in FIG. 5 with the male and female contact pins 15.25 connected, the dog 29 fixed to the rotary shell 22 , the switch 28 disposed on the rear end surface 21c of the fixed shell 21 is pressed to turn on the switch 28.
Ru. This ON operation causes the female contact pin 25 to connect to the conductive wire 2.
5a, and the male contact pin 1 of the plug 11
For example, a signal current or the like is sent to the illumination device 3 or the electronic endoscope 2 via the terminal 5, and an image signal from the electronic endoscope 2 is sent to the control device 4 via the male and female contact pins 15 and 25. CR connected to this control device 4
The observed image obtained by the electronic endoscopy VL2 can now be displayed on the T-monitor 5.

Further, when the rotary shell 22 is rotated Ea+ until the dog 29 turns on the switch 28, the steel ball 31c of the click buttock structure 31 is projected by the urging force of the elastic body 31b and engaged with the four parts 21f'. will be combined. The rotary shell 22 is caught in this click mechanism 31 and its rotation is restricted, and even if the grip of the plug 11 is released, this rotary shell 2
2 is never rotated, and the on operation of the switch 28 is never stopped.

Incidentally, as a modification of the first embodiment, the rotating shell 22
If the contact ring 1G is formed of a conductive material, the male shell 12a and the rotary shell 22 will come into contact with each other all around when the plug 11 and the receptacle 2o are mated together, so that conduction will occur with low impedance, and therefore the contact ring 1G, The ring spring 18 and ring cover 17a can be omitted.

Further, as another modification of the first embodiment, the contact ring 1
The wave washer 17tJ can be used in place of the ring spring 18 that biases the spring 6 toward the receptacle 20, and similar effects can be obtained.

FIG. 7 is a sectional view of a male shell portion of a plug showing a second embodiment of the present invention. In this embodiment, a groove 41 is formed in a circumferential manner on the outer periphery of the A thread 12a, and a contact ring 43 made of a ring-shaped leaf spring bulging in the outer radial direction is fixed in this groove 41. A slit is formed as necessary so that the contact ring 43 can be bent, or the contact ring 43 is formed by arranging a large number of leaf springs in a circumferential manner.

This embodiment has almost the same effects as the first embodiment.

FIG. 8 is a sectional view of a third embodiment of the present invention.

In this embodiment, as the contact surface of the male shell 12a of the plug 11 to the receptacle 20, the male shell 12a
A contact ring 45 made of an elastic conductive material is disposed around the outer periphery of the contact ring 45.

This embodiment also has the same effects as the first embodiment.

In addition, in each of the above-mentioned embodiments and modifications, an example is shown in which a contact ring that is biased toward the receptacle is provided on the plug side, but the same effect can be obtained even if this contact ring is provided on the receptacle side. can get.

[Effects of the Invention] As explained above, according to the present invention, there is no leakage of the electromagnetic shield at the connector device site, and the radiation of electromagnetic waves and the intrusion of external electromagnetic noise at the site.

This has the effect of preventing overlapping.

[Brief explanation of the drawing]

Figures 1 to 6 relate to the first embodiment of the present invention.
The figure is a cross-sectional view showing the plug and receptacle connected, Figure 2 (A) is a cross-sectional view of the plug, Figure 2 (B) is a perspective view of the ring spring, Figure 3 is a cross-sectional view of the receptacle, and Figure 4 The figure is a sectional view taken along the line A-Δ in FIG. 3, FIG. 5 is a view taken in the direction of arrow B in FIG. , FIG. 7 is a sectional view of a main part showing a second embodiment of the present invention, and FIG. 8 is a sectional view of a main part showing a third embodiment. 2...Electronic endoscope 1 4...Control device 4 a.
...Panel 7.9...Cable 11...
Plug 12... Plug body 13... Shintan wire 14... Shield wire 15... Contact pin 16... Contact ring 20... Receptacle 21... Fixed shell 25... Contact pin 43 .45...Contact ring

Claims (1)

[Scope of Claims] Almost the entire circumference of the tubular shielded wire that covers the signal wire inserted into the cable of the electronic endoscope is connected, while the internal contact pin and the wire extending from inside the cable are connected to each other. a plug equipped with a conductive member surrounding a signal line; a receptacle connected almost all the way around to an electromagnetically shielded control device body and equipped with a conductive member surrounding a contact pin provided therein; 1. A connector device for an electronic endoscope, comprising a contact member that brings the conductive members of the plug and receptacle into contact over substantially the entire circumference and with sufficiently low impedance when connecting the plug and the receptacle.