JPH11155809A - Shield structure of electronic endoscope device - Google Patents

Abstract

(57) [Summary] [Problem] To reduce the diameter of an insertion portion in consideration of noise suppression. SOLUTION: A signal transmission line 22 is connected to a CCD 12 and comprises an insertion section 10A, an operation section 10B, and a cable 10C.
In the electronic endoscope 10 in which the A and 22B are arranged, at least the front signal transmission line 22 arranged in the insertion portion 10A is provided.
A, a single first shield 31 is formed on the operation unit 10.
A second second shield 33 is formed on the signal transmission line 22B on the rear side from B. Further, a third shield 35 is provided in the entire exterior body of the electronic endoscope 10 including the cable 10C. The first shield 31 is connected to a circuit ground, the second shield 33 is connected to a housing ground of a processor device or the like, and the third shield 35 is connected to an external ground or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield structure of an electronic endoscope apparatus in which signal transmission lines are arranged throughout the endoscope from an image pickup element at a distal end to a cable connector.

[0002]

2. Description of the Related Art An electronic endoscope apparatus is provided with a CCD (Charge Coupled Device) as an image pickup device at the tip of the electronic endoscope. The CCD captures an image of a body to be observed and is output from the CCD. The video signal is supplied from an electronic endoscope to an external processor device or the like via a cable. Then, predetermined image processing is performed by the processor device, and the observed in-vivo image formed thereby is displayed on a monitor or the like.

[0003]

By the way, in the conventional endoscope, the diameter of the endoscope has been reduced in order to ease the pain of the patient at the time of insertion and to improve the penetrability of the endoscope viewed from the operator side. Is planned. However, in the endoscope insertion portion, the above C
A signal transmission line for performing electrical processing on the CD, a light guide for guiding light to the distal end, a treatment tool insertion channel, an air supply pipe and a water supply pipe for supplying / supplying air to / from the distal end, and an angle operation. Since various members such as a drive wire are provided and all the members are indispensable, it is extremely difficult to reduce the diameter more than the current state.

On the other hand, in a signal transmission line for obtaining a video signal from the CCD, an electric shield is provided on an outer periphery so that noise is not mixed into the signal. In order to sufficiently reduce this noise, JP-A-7-111979
As shown in the publication, it is preferable to form a double electric shield.

[0005] However, if the double shield is provided for the signal transmission line, the outer diameter of the transmission line becomes large, and the above-mentioned reduction in the diameter of the endoscope is not promoted.

The present invention has been made in view of the above problems, and has as its object to provide a shield structure of an electronic endoscope apparatus capable of reducing the diameter of an insertion portion in consideration of noise countermeasures. To provide.

[0007]

According to a first aspect of the present invention, there is provided an electronic endoscope having an image pickup device provided at a distal end of an insertion portion and a processor device for performing at least image processing. In the electronic endoscope apparatus, wherein a signal transmission line is arranged from the imaging device to the processor device, a single electrical shield is provided on at least a front signal transmission line arranged at the insertion portion of the electronic endoscope. And a double electric shield is provided from the front signal transmission line to the rear signal transmission line. Note that a plurality of signal lines are provided inside the signal transmission line. According to a second aspect of the present invention, a third electric shield is provided in the entire outer casing of the electronic endoscope and the outer casing of the cable, and the third shield is connected to an independent ground terminal. It is characterized by.

According to the above configuration, for example, a single shield is provided on the front signal transmission line from an appropriate place in the endoscope operation unit, and a double shield is formed on the rear signal transmission line from the appropriate place. I do. Therefore, in the endoscope insertion portion, the diameter of the insertion portion is reduced by a single shielded signal transmission line, while in other portions, the effect of preventing noise from being mixed into a signal is enhanced by a double shield. Can be.

In addition, the noise suppression for the signal transmission line in the insertion portion is lower than that of the other portions. However, by providing the third shield inside the outer casing of the electronic endoscope as described in claim 2 above, Noise mixed from outside the exterior body can be reduced.

[0010]

1 and 2 show a shield structure of an electronic endoscope apparatus according to an embodiment of the present invention, and as shown in FIG. 2, an electronic endoscope as a scope. 10 is an insertion part 10A, an operation part 10B, a cable 10
C and the like. A CCD 12 to be described later is arranged at the distal end of the insertion section 10A. A forceps port 13 connected to the treatment instrument insertion channel, an angle knob 14 for bending the distal end of the insertion section, air supply, water supply, and the like are provided on the operation section 10B. Operation switch 15 and the like are provided.

A first connector 17 for connecting to a light source device and a second connector 18 for connecting to a processor device are arranged on the cable 10C. Light entrance end 20 of guide
And a circuit section 21 for driving the CCD 12 and performing a part of image processing.

A front signal transmission line 22A having a single electric shield is connected to the CCD 12, and the front signal transmission line 22A is connected to the vicinity of the cable connection portion E of the operation portion 10B (the connection portion side of the insertion portion 10A). May be provided). Also, a rear end signal transmission line 22B having a double electric shield is connected to the front signal transmission line 22A, and the rear signal transmission line 22B is connected to the second connector portion 18 via the first connector portion 17. It is arranged until.

In FIG. 1A, an objective optical system 24 is disposed at the distal end of the insertion section 10A.
The CCD 12 is optically connected to the CCD 4 via a prism 25. The CCD 12 is a package 2 that also serves as a circuit board.
7 is attached. A plurality of signal lines 28 are connected to a terminal 27A at the rear of the package 27.
The signal line 28 is a drive signal line for supplying a drive signal for the CCD 12, an output signal line for outputting a video signal, and the like. These signal lines 28 are put together in the signal transmission lines 22A and 22B described above.

In the front signal transmission line 22A,
As shown in FIG. 1B, a single first shield (net) 31 is provided inside (or inside) the outer skin 30.
On the other hand, in the rear signal transmission line 22B, an outer skin 32 is formed outside the outer skin 30 as shown in FIG.
A second second shield (net) 3 inside the outer skin 32
3 are provided.

As shown in FIG. 2, the first shield 31 is connected to the circuit ground of the circuit section 21 of the first connector section 17, and the second shield 33 is connected to the processor unit via the second connector 18. Are connected via a capacitor or the like to the housing ground. This capacitor is arranged to satisfactorily remove high frequency noise and the like.

Also, in this example, the above-described insertion portion 10A,
The operation unit 10B, the first connector unit 1 from the operation unit 10B
The third electric shield 35 is also provided on the outer body of the cable 10C up to 7. That is, in the insertion portion 10A, the mesh shield 35A is provided in the outer skin, and in the operation portion 10B, the metal shield body (tube or the like) 35 is provided in the plastic case.
B, the cable shield 3 is also set within the external ratio in the cable 10C.
5C are provided, and all of these shields 35 to 35C are electrically connected. And this third shield 35
Denotes an external ground terminal 36 provided on the first connector 17.
Connected to

According to the above configuration, the noise current captured by the first shield 31 flows to the circuit ground from the circuit section 21 and the like, and the noise current captured by the second shield 33 is transmitted to the housing of the processor device or the like. It flows to the ground via a noise removing capacitor or the like. The noise current captured by the third shield 35 is dropped from the independent external ground terminal 36 to ground. In this way, it is preferable that noise generated from the oscillation circuit, the electromagnetic circuit, the discharge circuit of the light source unit, the noise generated when the electric knife is used, other external noise, and the like used in the device be mixed into the signal. Can be prevented.

[0018]

As described above, according to the present invention,
A single shield is provided on the front signal transmission line arranged at least in the insertion portion of the electronic endoscope, and a double shield is provided on the signal transmission line from the front signal transmission line to the rear signal, so that the insertion portion has a small diameter. And noise reduction is satisfactorily performed in other portions. According to the second aspect of the present invention, since the third shield is provided in the entire exterior body of the electronic endoscope and the exterior body of the cable, the effect of preventing noise from being introduced into the single shielded insertion portion is reduced. Can be compensated to some extent.

[Brief description of the drawings]

1A and 1B show a shield structure of an electronic endoscope apparatus according to an embodiment of the present invention, wherein FIG. 1A is a configuration diagram of a configuration inside a distal end portion and a signal transmission line, and FIG. Area view,
FIG. 3C is a longitudinal sectional view of the rear signal transmission line.

FIG. 2 is a diagram showing an overall configuration of an electronic endoscope to which the shield structure of FIG. 1 is applied.

[Explanation of symbols]

10: electronic endoscope, 10A: insertion section, 10B
… Operation unit, 10C… Cable, 12… CC
D, 22A: front signal transmission line, 22B: rear signal transmission line, 31: first shield, 33: second shield, 35: third shield.

Claims (2)

[Claims] An electronic endoscope having an image pickup device provided at a distal end of an insertion section and a processor device for performing at least image processing connected by a cable, and a signal transmission line arranged from the image pickup device to the processor device. In the endoscope apparatus, a single electrical shield is provided on at least a front signal transmission line disposed at the insertion portion of the electronic endoscope, and a double electrical shield is provided on the signal transmission line from the front signal transmission line to the rear signal transmission line. A shield structure for an electronic endoscope device, wherein an electric shield is provided. 2. A method according to claim 1, wherein a third electric shield is provided in the whole exterior of the electronic endoscope and in the exterior of the cable, and the third shield is connected to an independent ground terminal. The shield structure of the cable electronic endoscope device according to claim 1 or 2, wherein the shield structure is provided.