JPH02193634A - Shielding device for endoscope image pickup device - Google Patents

Abstract

PURPOSE:To prevent a noise from being mixed to the video signal line of a patient circuit part by providing a shielding means to separately shield the patient circuit part and a signal input/output part. CONSTITUTION:An endoscope image pickup device is composed of an electronic scope 52, light source unit 53, video processor 54 to process an image pickup signal and monitor 55 connected to this video processor. A patient circuit part 104 in the above-mentioned video processor is shielded with a shielding case 105. Then, a signal input/output part 106 isolated from the patient circuit part by a photo-coupler 80 and a high frequency transformer 83 is shielded with a separate shield case 107 as well. Thus, since the patient circuit part and signal input/output part are separately shielded, the noise is effectively prevented from being mixed from the signal input/output part, etc., to the video signal line of the patient circuit part and the degradation of picture quality is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a shielding device for an endoscopic imaging device in which a patient circuit section and a subsequent signal processing section are separately shielded.

[Prior art] In recent years, instead of optical endoscopes that use image guides as image transmission means, electronic endoscopes that use imaging means such as COD1 have been developed.
1 (hereinafter referred to as electronic scope) was put into practical use.

When this electronic scope is inserted into the body, it is used by being electrically connected to a device that performs signal processing, so in order to ensure its safety, an endoscope imaging device 1 shown in FIG. There is one that has the following structure.

This device 1 basically includes a patient circuit section 3 that is electrically connected to an electronic scope 2 that is inserted into a living body, that is, comes into direct contact with a patient, and processes signals received from a solid-state image sensor 4. , send processed signals to peripheral devices,
It consists of a signal input/output section 5 for inputting signals from peripheral devices, and as an interface between the patient circuit section 3 and the signal input/output section 5, the output video signal from the solid-state dancing thread 4 is passed through an isolation circuit 7 using a high frequency transformer. The drive pulses for driving the solid-state image carrier 4 are isolated by an isolation circuit 6 such as a high-frequency transformer or a photocoupler, thereby electrically connecting the patient circuit section 3 and the signal input/output section 5. It is insulated to prevent leakage current from flowing into the patient from peripheral equipment.

This device includes a primary circuit 12 into which commercial power is input, a signal input/output section 5 whose housing 13 is grounded, and a patient circuit section (where the patient can The electrical circuits that form part of the electrical circuits are divided into 3), and the dielectric strength and leakage current are regulated for each relationship.

At the tip of the electronic scope 2, a solid-state image element (hereinafter referred to as SI) is installed.
Marked D. )4 is built in, and a plurality of drive signals are applied to this S]D4 from the SID driver 19 on the main processing device 18 side. This drive signal is transmitted via coaxial cables 21, 21, for example. Also, this drive message j3
The signal output from the 5ID4 is amplified by the amplifier 22, transmitted via the coaxial cable 23, amplified by the amplifier 24 inside the housing 13, and then sent to the isolation circuit 7 via the isolation driver 25. to drive.

Incidentally, both of the drivers 19 and 25 are supplied with power by the patient circuit power supply 26. Also, this power supply 26 (well,
It also supplies driving force to 5ID4.

Also, a driver 1 outputs a drive signal to the above 5ID4.
9 is supplied with the timing signal from the SID timing signal generation circuit 2 via the isolation circuit 6.

Also, a driver 2 to which the output signal of the amplifier 24 is input.
5 is also input to the signal processing circuit 31 via the isolator circuit 7, and the processed video signal is output from the signal output terminal 32 to the peripheral equipment side.

The SID timing signal generation circuit 28, signal! 2! I
I l! l! The circuit 31 is supplied with Mino J from a signal input/output circuit power supply 33. Also, isolation circuit 6゜7
Power is supplied to the R16 section on the signal input/output section 5 side from the signal input/output circuit power supply 33, and power is supplied to the section belonging to the patient circuit section 3 side (C) from the training circuit power supply 26. The power supply 26 and the signal input/output circuit power supply 33 are isolated from each other by a power transformer 34 on the secondary side:
, 34b supply commercial AC power.

By the way, the 1-stage scalpel 35 supplies the output signal of the oscillator 36 to the excision electrode 38 via the isolation transformer 37.

The high frequency output signal supplied to the resection beam 38 is returned to the transformer 37 via three plates that come into contact with the patient over a wide area.

Note that the oscillator 36 and the transformer 37 are shielded by a shield frame 40.

On the other hand, the applicant has published J3 in Japanese Patent Application Laid-Open No. 60-220034.
12 and 13, the light source device 41 is
I thought about it.

Inside the main body 42 of this device 41, a plurality of electric circuit boards 44 and 45 incorporating electric circuits for various controls such as lamp emission are arranged in parallel with a space between them.

Each electric circuit board 4/1.45 is attached to a pair of front and rear branches 47.48 standing upright from the bottom plate 46 of the main body 42. Incidentally, a shield plate 49 for electrically shielding is attached between both substrates 44 and 45. Other members are described in the above publication.

However, if the boards /1.4 and 4.5 in FIG. 12 are assumed to correspond to the patient circuit section 3 and signal input/output section 5 in FIG. 11, the following problems arise.

[Problems to be Solved by the Invention] When this arrangement is made, the jump noise between the boards 44 and 45 (clock noise generated in the control section in the output section 5 of the Zunawa I55) is may enter the video signal line of the camera, causing deterioration of image quality.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a shield device for an endoscope image mounting system that can prevent noise from entering the video signal line of the patient circuit section. do.

[Means and effects for solving the problem] In the present invention, in an imaging apparatus in which a patient circuit section and a signal input/output section are electrically insulated, a shielding means for separately shielding the patient circuit section and the signal input/output section is provided. By providing this, it is possible to prevent noise from the signal input/output section from entering the video signal line of the patient circuit section.

[Example] Hereinafter, the present invention will be specifically explained with reference to the drawings.

Figures 1 to 3 relate to the first embodiment of the present invention.
The figure shows a video processor including the shield device of the first embodiment, FIG. 2 shows the installation of the shield woofer in this video processor, and FIG. 3 shows the endoscope i-image device equipped with the first embodiment. The configuration of the endoscopic VL decoy @ device 51 provided with the first embodiment is shown in FIG. It consists of a unit 53, a video processor 54 that processes signals captured by the electronic scope 52, and a monitor 55 connected to the video processor 54.

The electronic scope 52 includes an elongated, for example, flexible insertion section 56, and a large-diameter operation section 57 at the rear end of the insertion section 56.
are connected. (From the operation section 57, it is possible to move to the side)
A flexible universal cord 58 and a light guide 59 are extended, and a connector 61 connectable to the video processor 54 is provided at the tip of the universal cord 58 .

On the distal end side of the insertion portion 56, there is a rigid distal end portion 62 and a curved portion 63 adjacent to the distal end portion 62 that can be bent to the rear side.
are set up in sequence. Further, the operation section 57 is provided with a bending operation knob (not shown), and by rotating the bending operation knob, the C1 curve ff1l 63 can be bent in the vertical/horizontal direction. Furthermore, the operating section 57 is provided with an insertion hole (not shown) that communicates with a treatment instrument channel 64 (see FIG. 3) provided within the insertion section 56.

As shown in FIG. 3, an objective lens 66 and a solid-state lIυ image element 67 are disposed within the distal end 62 of the insertion portion 56. Furthermore, a light guide 68 for transmitting illumination light is inserted into the insertion portion 56 .

The light source unit 53 includes a white light source 72 such as a xenon lamp, and the white light emitted from the white light source 72 is focused by a lens 73, and the frame frequency of the video signal is 29.971''Z) in the CNTSC system. A rotating filter 74 that rotates synchronously converts the light into R, G, and B light in sequence, and irradiates the object 71, such as an internal organ to be observed, through the light guide 68 and the light distribution lens 69.

The motor 75 that rotates the rotary filter 74 is as follows:
A rotation servo circuit 76 controls the rotation of the sea urchin in synchronization with the frame frequency of the video signal.

The reflected light from the object 71 is imaged on the image plane of the solid-state ML image element 67 via the objective lens 66, and photoelectrically converted by the readout signal by the driver 77. signals are output in sequence.

An SID drive signal from an SID timing signal generator 79 to which a quasi-clock is input to a synchronization signal generator 78 is input to the driver 77 via an isolation photocoupler 80 .

A reference signal is also supplied to the rotation servo circuit 76 from a synchronization signal generator 78 . As a result, all signals (operations) are phase synchronized and become Iζ.

R and G output from the solid-state decoy image element 67.

The B sequential signal is sent to the preamplifier 8 of the video processor 54.
After passing through an isolation drive circuit 82 and an isolation high-frequency transformer 83 for protecting the patient from electric shock, etc., the reset noise is removed by the reset 1 to noise removal circuits 84. Further, unnecessary components are removed by a low-pass filter 85, vertical contour correction circuit 86-(-!u straight contour correction is performed, and γ correction circuit 8
7 for γ correction. The output signal 1 of the γ correction circuit 87 is converted into a digital signal by the A/D converter 88, and the frame memories 89R and 89G correspond to frame sequential illumination.

89B stores signals read out under each of the R, G, and B illumination lights for one frame memory. The F frame memories 89R, 89G, and 89B are simultaneously read out to become simultaneous signals, which are each converted into analog signals by a D/A converter 90. Note that the A/D converter 88
Conversion speed, each) frame memory 89R, 89G, 89B
Writing and reading of data to and from the memory control circuit 91
It is controlled by the output signal of

These analog R, G, and B simultaneous signals are each [1-
After unnecessary components are removed by the bus filter 92 and horizontal contour correction is performed by the horizontal contour correction circuit 93, the signal is amplified by the output amplifier 94 and outputted from the output end as R, G, and B three primary color signals with an output impedance of, for example, 75Ω. monitor 55
Output to.

In addition, R2O,B which was synchronized and underwent horizontal contour correction
A Y matrix circuit 96 generates a luminance signal Y from the signal, and a RY matrix circuit 97 and a 3-Y matrix circuit 98'c generate color difference No. 18 RY, RY, and chrominance signals from the luminance signal Y and color signal R, respectively. Terumo Shin @ Y color signal B to color difference signal R
~B is generated.

The above color difference signals R-Y and B-Y are respectively processed by subcarrier (3,579545)-1 by encoder 99.100.
2 (each with a 90 degree phase difference signal), the adder 1
01, vector synthesis is performed to generate a chrominance signal C. The above chrominance signal C is transmitted to the mixed output amplifier 10.
2, the signal is multiplexed with the luminance signal Y, and a composite synchronization signal and color burst are added to generate a composite video signal of the NTSC system.
It comes out from the output end.

Incidentally, the patient circuit section 104, which is comprised of the driver 77, preamplifier 81, and isolation controller drive circuit 82 in the video processor 54, is shielded by a shield case 105'c. In addition, the input/output section 106b, which is isolated from this patient circuit section 10/l and a photocoupler 80° high frequency transformer 83 as an isolation means, is provided in a shield case separate from the above shield case 105. 107 is a feature of the first embodiment.

The patient circuit 104 and signal input/output unit 106 in the video camera setter 54 are implemented as shown in FIG. 1, for example.

Output image obtained from the electronic scope 52 9 I ¥”;
It is connected to the parent board 112 through the signal line 111 inside the L, t video processor 54. A pattern runs on the mother board 112, and connectors 113, 1
A high frequency transformer 83 is mounted on the main board 112 via the child boards 114 and 115 connected by 13.
(The photocoupler 80 is mounted on the other side of the transformer 83.) This provides isolation between the patient circuit section 104 and the signal input/output section 106. The signal person output unit 106 also connects the vAIlil 12 to the D connector 113.
．． -...Through 113, the daughter board 116, 117, 118
is mounted, and a signal line 119 extending from the parent board 112 is guided to the =I connector 103 and output to an external peripheral device such as the monitor 55.

Further, the SID drive signal from the SID timing signal generator 79 in the signal input/output section 106 is sent to the photocoupler 80.
Isolation is performed by the electronic scope 52.
The solid-state image sensor 67 built in is driven.

Furthermore, a patient circuit shield case 105 is provided in the patient circuit section 104 to prevent intrusion noise from the signal input/output section 106 and external noise from outside the video A blocker 54 from entering the patient circuit section 104 .

Further, the signal input/output section 106 is provided with a signal output section shielding case 107 to prevent clock noise from the SID timing signal generator 79 from entering the patient circuit section 104.

Note that each shield case (for example, 107
) are screwed as shown in FIG.

In other words, the GNI) 1121 and the power supply layer 12 are placed on the inner layer of the main board 112 (in this case, there are 4 layers, but any number of layers is acceptable).
2 exists, a metal shield case 107 and a parent board 11
2, the GND layer 121 is exposed as shown in the figure, and the solid ground of the shield case 112 and the GND layer 121 are joined by screws 123, resulting in a sealed state, which further improves the shielding effect. This is to bring about.

Note that other means than screwing may be used as long as the two members are joined together. Further, this can be applied to both the thinker circuit section 104 and the signal input/output section 106.

According to the first embodiment configured as described above, the patient circuit section 104 and the signal input/output section 106 are separately shielded by both the shield cases 105 and 107. ) Line signal input/output unit 10
If it is possible to prevent noise from entering the input/output unit 106, it is also possible to prevent noise from outside the input/output unit 106, thereby preventing deterioration of image quality. Further, noise generated in the patient circuit section 104 and the No. 5 input/output section 106 can be prevented from being transmitted to the outside of the imaging device 51.

Note that both shield cases 105 and 107 may be installed in the patient circuit section 104 in consideration of space and cost, or may be installed in the signal input/output horn section 106. Further, only the noise generating portions of the patient circuit section 104 and the signal input/output section 106 may be shielded separately. Note that the isolation means is not limited to that of the first embodiment, and any known isolation means may be used.

FIG. 4 shows a second embodiment of the invention.

In the first practical example, the high frequency transformer 83 or the photo coupler 80 was shielded on both sides as the isolation means, but in this second embodiment C, the high frequency transformer or the photo coupler (hereinafter referred to as A part of the isolation element f] 21 (representatively represented by 7) is covered with a patient circuit section shield case 105' and a signal input/output section shield case 107'.
There is a method C that prevents noise from entering the input/output terminals of the 121 and prevents deterioration of image quality.

The rest of the structure is the same as that of the first embodiment, and the explanation thereof will be omitted.

FIG. 5 shows a third embodiment of the invention.

In this embodiment, two shield cases 131 are used to shield the patient circuit section 104 and the signal input/output section 106, and a boundary shield 132 is provided between the patient circuit section 104 and the signal input/output section 106. 4. However, the boundary shield 132 and the shield case 131 are integrated (9゛J) and are separate (A3
It may be 'l.

FIG. 6 shows a fourth practical example of the present invention. In this embodiment, an isolation element 121 is included in a shield case 141 for a patient circuit section, which is a shield type. Of course, it goes without saying that the same effect can be obtained with a shield that includes the isolation element 121 (not shown) in the signal input/output shield case 107. It is also possible to use an I-type system in which the isolated y isolation unit 121 is included in one of the shield cases of the patient circuit section 104 and the signal input/output section 106, and separated by a boundary shield 132 as shown in Fig. 5. good.

FIG. 7 shows a fifth embodiment of the present invention. In this embodiment, )! The isolation element 121 is connected to the child 7. of the patient circuit section 104. The patient circuit section 104 and the signal input/output section 106 are provided with shields 1 to cases 105 and 107, respectively, mounted on the H board 115'.

As shown in this figure, a separate shielding case 105.1
07, but may also be C using a boundary shield 132 as shown in FIG.

Further, as a modification of the one shown in FIG. 7, it is of course possible to obtain the same effect even if the isolation element 121 is not mounted on the slave board of the signal input/output section 106.

FIG. 8 shows a sixth embodiment of the present invention 71. .

In this embodiment, as shown in the figure, the ↓J board 1
62 and the signal input/output on which electronic components 163 and the like are mounted (shield cases 165 and 166 are provided on each of the boards 164, and the two interfaces are connected by connectors or harnesses 167).

Also, it goes without saying that the isolation resistor 121 can be mounted on the signal input/output board 164 side, and the shield cases 165 and 166 can be mounted on the boundary shield 1 as shown in FIG.
32 may be used as the lζ method. Further, the shield case described above may be provided with only one of the patient circuit section 104 and the signal input/output section 106 due to space and cost considerations.

The above-described shielding method can effectively prevent noise from the overlapping clock generated from the signal input/output section 106 from entering the video signal line of the patient circuit section 104 and causing deterioration in image quality.

Furthermore, above) 7! In each of the embodiments, the GND layer of the parent board 112 is used as a part of the shield case, but a shield mechanism as shown in FIG. 10 may also be used.

As shown in FIG. 9, a bottom shield case 171.
172 to bring about an even further shielding effect.

The above content is based on the patient circuit section 104 and the signal input/output section 106.
A shield case is provided on either side to prevent intrusion noise from entering, thereby preventing deterioration of image quality.

On the other hand, as shown in FIG. 10, by grounding the GND of the patient circuit section 104 and the signal input/output section 106 using a capacitor C with sufficient withstand voltage and low leakage current,
In terms of high frequency, they may be set to a state close to the same potential to prevent noise from entering.

What has been explained below is about the shielding means or shielding method for the patient circuit section 104 and the signal input/output section 106, but it can be applied in exactly the same way to shielding between the analog section and the digital section. Needless to say, it is. In other words, by shielding the analog section and the digital section separately with shield cases, and connecting these shield cases to the solid ground of the motherboard, it is possible to effectively prevent the signals of the digital section from entering the analog section as noise. Also applicable.

In addition, in the above explanation, the ! of the field sequential method is used. l1it! 4I
Although we have described the device, the same applies to the case of a simultaneous type imaging device that carries out color imaging using a solid-state imaging device having a color filter that emits white light, and performs signal processing on this color imaging signal. can.

[Effects of the Invention] As explained above, according to the present invention, since the thought circuit section and the signal input/output section are separately shielded, noise is not transmitted from the signal input/output section etc. to the video signal line of the patient circuit section. Contamination can be effectively prevented and deterioration of image quality can be prevented.

[Brief explanation of the drawing]

Figures 1 to 3 relate to the first embodiment of the present invention.
Figure 71 is a schematic configuration diagram showing the shield device part of the first embodiment, Figure 2 is an explanatory diagram showing the mounting part of the shield case,
FIG. 3 is a block diagram of a family celebration vlIl'ta image device equipped with the first embodiment, FIG. 4 is a schematic block diagram showing the structure of the second embodiment of the present invention, and FIG. 5 is a third embodiment of the present invention. FIG. 6 is a schematic diagram showing the configuration of the fourth embodiment of the present invention. FIG. 7 is a schematic diagram showing the configuration of the fifth embodiment of the present invention. The figure is a schematic configuration diagram showing the configuration of the sixth embodiment of the present invention, FIG. 9 is a schematic configuration diagram of the configuration of the seventh embodiment of the present invention, and FIG. 10 is the configuration of the eighth embodiment of the present invention. A schematic configuration diagram shown in FIG. 11 is a configuration diagram of a conventional imaging device.
2 and 13 are new views showing other conventional light source devices. 51... Endoscope decoy lj1 device 52... Electronic scope 53... Light source unit 54... Video processor 55... Monitor 67... Solid-state image sensor 8
0...Photo coupler 83...High frequency transformer 1
04...Patient circuit section 105.107...Shield case 106...Signal input/output section 112...Main board 113
...Connector 11/l, 115, 116, 117.118...Device board (Figure 6) Isolation 1 (Figure 10) Figure 13 (11)! Figure 7 Figure 9! Figure 2

Claims (1)

[Scope of Claims] An internal device comprising a patient circuit section electrically connected to an endoscope that can be used in vivo, and a signal input/output section connected to the patient circuit section via isolation means. A shielding device for an endoscopic imaging device, characterized in that the endoscopic imaging device is provided with shielding means for separately shielding the patient circuit section and the signal input/output section.