JPH0590830A - Signal transmission equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] A signal transmission device capable of performing signal transmission without noise from the outside between a rotating part and a fixed part, and having high signal transmission accuracy without being a noise source to the outside. I will provide a. [Structure] The antenna unit 45 includes a fixed part 110 and a rotating part 111. The rotating part 111 is a hollow cylindrical part 11
It has a la and a disc portion 111b. The fixed portion 110 has three concentric grooves 110A, 110B and 110C,
In the grooves 110A to 110B and 110C, the antenna parts 121A and 121A are respectively made of the glass epoxy resin 120,
It is formed on 120 and is provided with a sliding contact portion 130 made of carbon tool steel or the like. An insulating sheet Teflon TF is attached to the lower surface of the antenna portion 121A. The antenna parts 121A and 121A include lead wires 81,
It is connected to an external unit by 82.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device, and more particularly to a signal transmission device for transmitting a signal between a rotating part and a fixed part.

[0002]

2. Description of the Related Art Conventionally, for transmitting a signal between a rotating portion and a fixed portion, there is a method of transmitting and receiving a signal using a transmitting antenna and a receiving antenna.

[0003]

However, this method is unavoidable when it is unavoidable to mix in noise from the outside or to become a noise source, and has a problem when accurate signal transmission is required.

An object of the present invention is to provide a signal transmission device having a simple structure which does not mix external noise in signal transmission between the rotating part and the fixed part, does not serve as a noise source to the outside, and can be easily manufactured. To provide.

[0005]

According to the present invention having the above-mentioned object, a metal coating is formed on both surfaces of a resin disk, one surface serves as a ground, the other surface serves as an antenna surface, and the antenna surfaces face each other. Then, the signal was transmitted and received.

An insulating sheet is arranged between the facing antenna surfaces.

[0007]

In the signal transmission device described above, metal coatings are formed on both sides of a resin disk, one surface of which is grounded and the other surface of which is an antenna surface. This is copper on both sides of the printed board, that is, the board made of glass epoxy resin,
Etching is performed to form a circular antenna part. By forming in this way, the antenna portion can be easily manufactured, and since the glass epoxy resin is used to make the material homogeneous, stable transmission and reception can be performed.

Further, by disposing the insulating sheet between the facing antenna surfaces, the contact between the antenna surfaces can be prevented, and the electrical characteristics can be secured even if the both antenna surfaces contact each other. ..

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram for explaining the principle of the present invention. In FIG. 1, a signal transmission device 100 includes a pair of ring-shaped conductors 101 and 102, each of which has a lead wire drawn out, inside a hollow electromagnetic shield body 103, which are coaxially opposed to each other at a predetermined interval. In addition, one of the ring-shaped conductors is provided so as to be rotatable in the circumferential direction around the axis.

Next, the structure of a rotary tube inspection machine using the signal transmission device according to the present invention will be described with reference to FIGS. 2, 3 and 4. The rotary tube inspection machine 2 includes a base 35, a motor 36, and a rotating shaft 3
7, rotation inspection table 12, cam 46, cam follower 4
7, a holder lifting / lowering rotary shaft 48, and a centering jig 3
8, in-tube inspection device 39, and camera selector 43
And a mixer 44 and an antenna unit 45 which is a signal transmission device.
The rotary resolver 49, the fixed resolver 50, and the light amount checker 51 are provided.

A fixed shaft (not shown) is provided on the base 35, and a tubular rotary shaft 37 is provided so as to share the axis with the fixed shaft and cover the fixed shaft. The rotary shaft 37 is configured to be rotationally driven by the motor 36. A rotary resolver 49 and a fixed resolver 50 are provided to measure the angular position of the fixed shaft and the rotary shaft. The rotation inspection table 12 is coupled to the rotation shaft 37 and rotates with the rotation of the rotation shaft 37. A holder H can be placed on the rotation inspection table 12. The holder H is lifted and lowered by a holder lifting and lowering rotation shaft 48. The raising / lowering operation of the holder raising / lowering rotary shaft 48 is performed by a cam 46 and a cam follower 47 provided at the lower end of the holder raising / lowering rotary shaft 48. The squeeze port side of the laminated tube T can be fitted into the holder H. Further, a centering jig 38 for holding the tail side of the laminate tube T in a circular shape.
Is supported above the holder H. The in-tube inspection device 39 for inspecting the inside of the laminate tube T has an in-tube insertion portion 40, a borescope 41, and a CCD camera 42. The borescope 41 includes a borescope body 52 and a borescope insertion portion 53. The tube insertion portion 40 is a borescope insertion portion 53.
A light emitting diode section 54, a photo sensor section 55,
Is included. Of these, the borescope insertion portion 53 mainly inspects the bottom surface side of the laminate tube T in the figure, that is, the squeeze port side, and the light emitting diode portion 54 and the photosensor portion 55 mainly inspects the inner surface side of the laminate tube T.

Next, the operation of the rotary tube inspection machine will be described with reference to FIGS. In FIG. 2, the laminate tube T is placed on the holder H and is conveyed to the star wheel 11 by the conveyor 9 or the like. The star wheel 11 takes the laminated tube T together with the holder H onto the rotary inspection table 12 of the rotary tube inspection machine 2. After being taken in on the rotating inspection table 12 that rotates, the holder H rises according to the cam curve of the cam 46 as the holder elevating and lowering rotary shaft 48 moves up and down, and intermittently rotates around the holder elevating and lowering rotary shaft 48. I do.

That is, as shown in FIG.
Performs rotation at the inspection position while revolving in 12 directions of rotation
However, in that case P₁, P₂, P₃, P_FourIn terms of
Stops the rotation for a predetermined time. To raise the holder H
The laminate tube T also rises and the centering jig
Inside the tube that is held in a circular shape by 38
The tube insertion portion 40 of the inspection device 39 is inserted. this
Insert the tube insertion part 40 inside the tube.
The laminated tube T at the point P₁~ P _FourBetween
In the tube
Using the inspection device 39, the bottom surface of the tube and
The inside surface of the tube can be inspected. One chew
When the inspection of the
Tube T is discharged. In addition, the tube insertion part 40 is
Check the light intensity before it is inserted into the mine tube T.
The light quantity of the light emitting part is checked by the power 51, and the result is
Reflected when processing data. If the light intensity is below the standard value,
In that case, an alarm can be issued and parts can be replaced.

Next, a more detailed structure of the tube insertion portion will be described with reference to FIGS. 9 and 10. FIG. 10 (A)
3 shows a cross section of the tube insertion portion 40 in the laminated tube T in the I-I direction. In addition, FIG. 10C is a cross-sectional view taken along line II-II, and FIG.
Is a sectional view taken along line III-III.

The tube insertion portion 40 is a borescope 4
1, the light emitting diode portion 54, the joint metal fitting 56 and the bolt 5
7, and the light emitting diode portion 54 and the photosensors 55a, 55b, 55c, 55d, 55e, and 5 are attached.
5f and are attached.

A sectional view of the borescope insertion portion 53 is shown in FIG.
It shows in (B). The borescope insertion part 53 is provided with a lens part 60 for picking up an image inside a stainless tube 58, and a light source fiber part 59 including a thin glass fiber is provided around the lens part 60. In FIG. 10D, the end surface S of the borescope insertion portion 53 is the borescope insertion portion 5
3 is perpendicular to the axis, but it may have a shape cut obliquely so as to form an angle with the axis. In this case, the field of view is expanded not only vertically downward but also diagonally.

The borescope insertion portion 53 is eccentric from the axial center of the laminate tube T, and its positional relationship is shown in FIGS. 9 (A) and 9 (C). That is, in this case, the inspectable area F ₁ of the borescope insertion portion 53 is a quadrant circle portion excluding the mask portion (hatched portion) from the square camera field of view. Laminate tube T, the point P ₁ performs intermittently rotation motion as shown in FIG. 3,
Since it temporarily stops at P ₂ , P ₃ , and P ₄ , the inspectable area F ₁ in FIG. 9C can be inspected when the point P ₁ is stopped, and the inspectable area F ₂ is stopped when the point P ₂ is stopped. Can be inspected. Similarly, the inspectable area F ₃ can be inspected when the point P ₃ is stopped, and the inspectable area F ₄ can be inspected when the point P ₄ is stopped. In this way, by dividing the inspection region as shown in FIGS. 9A and 9C, and approaching the inner bottom surface to perform imaging and inspection,
As shown in FIGS. 9 (B) and 9 (D), the resolution can be further improved and a finer resolution can be obtained as compared with the case where the borescope insertion portion 53 is placed in the axial center of the laminated tube T and the inspection is performed as one inspection area. It becomes possible to detect defects such as contaminants and scratches. The division of the inspection area is not limited to four divisions, and other numbers may be used.

On the other hand, the light emitting diode section 54 is a laminator.
Covers the inner bottom surface of the tube T to the upper opening surface
It has a length and illuminates the inner surface from the top to the bottom.
You can Each of the photo sensors 55a to 55f has a light emitting diode.
Three pieces are provided on both sides of the ion part 54,
The inspection areas overlap as shown in 10 (C).
It is set up like this. By configuring in this way,
The photo sensors 55a to 55f and the laminate tube T are
Period of rotation, that is, point P in FIG. ₁,
P₂, P₃, P_FourDuring the period excluding the period stopped at
The inner surface can be inspected. Where the photo
The sensors 55a to 55f may be provided in a line, or
Or a photoelectric conversion element other than the photosensor, such as C
It may be a CD element or the like.

Next, processing of the inspection information detected by the in-tube inspection device 39 will be described. The image information of the inner bottom surface of the laminate tube T detected by the CCD camera 42 is converted into a video signal, and the inspection information of the inner surface of the laminate tube T detected by the photosensor unit 55 is converted into a voice signal, and both are mixed. , Is transmitted to the outside to determine whether or not there is a defect.

FIG. 11 is a block diagram showing the flow of image information processing on the inner bottom surface of the laminate tube T. 11
Are roughly divided into a rotating block 85 and a fixed block 86. The rotation block 85 includes 12 CCD cameras 42a-
42l and 12 CCD cameras are divided into four groups of three cameras, one of the three cameras is selected, and the image information is selected by the VIDEO selector 43.
a, 43b, 43c, 43d. The image information selected by the VIDEO selectors 43a, 43b, 43c, 43d is the RF converters 44a, 44b, 44c,
44d, and the information is converted to RF amplifiers 44e, 4 and
It is amplified by 4f, 44g and 44h. The signals amplified by the RF amplifiers 44e, 44f, 44g, and 44h pass through BandPass Filters (bandpass filters) 44i, 44j, 44h, and 44l, and then four VIDEO selectors 43a, 43b, and 43.
It is sent to the mixer 44 which mixes the signals selected from c and 43d. The signal output from the mixer 44 is BP
It is sent to the antenna unit 45 through F95.

Referring to FIGS. 7A and 7B, the antenna unit 45 comprises a fixed part 110 and a rotating part 111. The rotating part 111 includes a cylindrical part 111a and a disk part 111b.
And have. The fixed portion 110 has grooves 110A and 110A.
B and 110C, the fixed part 110 and the rotating part 111 are overlapped to form one antenna. The structure of the antenna in the groove 110A formed in the fixed portion 110 will be described as an example. In FIG. 5, a copper coating 121 is applied to both sides of a printed circuit board 120 made of glass epoxy resin, and a circular shape is formed by etching. The thin strip shape is the antenna side 121A, and the entire surface covered with a copper coating is the ground side 121E. At that time, in order to match the impedances of the antennas on the transmitting side and the receiving side, a printed circuit board 1 formed on a glass epoxy resin
The thickness of 20 is 1.6 mm, the width of the antenna portion on the printed circuit board is 2.75 mm, the distance between the transmitting antenna AT and the receiving antenna RX is 1 mm, and the ground side 121E and the lead wires 81 and 82 are connected to each other. Is set to 1.6 mm, and these numerical values are set to the same numerical values as the transmitting antenna AT and the receiving antenna RX, the impedance becomes 50Ω from both the transmitting antenna AT and the receiving antenna RX, and the impedances are matched. (See FIG. 5B), a standing wave (SWR) is not generated and a signal without noise can be transmitted and received.

As shown in FIG. 7A, the antenna 121
The bottom surface of A is a doughnut-shaped Teflon T with a thickness of 0.2 mm.
F is attached. By interposing the Teflon TF between the two antennas 121A, even if the antennas come into contact with each other, it is possible to prevent noise due to a short circuit, disturbance of an image, and destruction of a circuit due to impedance change. it can. The Teflon TF may be attached to both the upper and lower antennas or may be placed on the lower antenna. As a material other than Teflon, PTFE is used.
(Fluorine resin), UHMW · PE (ultra high molecular weight polyethylene), POM (polyacetal), HMW · PE (high molecular weight polyethylene), etc. may be used as long as they have excellent insulating properties, lubricity and abrasion resistance. In addition, such a resin sheet has a groove 1
It goes without saying that the antennas provided in 10B and 110C also intervene.

FIG. 8 shows a schematic configuration diagram of the transmitting side antenna AT and the receiving side antenna EX. As can be understood from this figure, the antennas 121A and 121A of the transmitting side antenna AT and the receiving side antenna EX are striped, and the grounding portion 121E is entirely covered with a copper coating.

The sliding contact portion 13 formed of carbon tool steel or the like
0 (see FIG. 7) is provided. Antenna part 121A
Are connected to an external unit by lead wires 81 and 82. The antenna part 121A is the BNC connector 150.
Signals are input and output through the lead wires 81 and 82.

As described above, in the grooves 110A, 110B and 110C formed in the fixed portion 110, each CCD serves as a pair of transmitting and receiving antennas for transmitting a synchronizing signal.
Used for camera. The transmitting antenna and the receiving antenna are in non-contact state and always face each other even if the rotating block rotates, so that information signals can be transmitted and received stably, and they are electromagnetically shielded so that they are affected by external noise. There is also no noise source to the outside.

Now, the processing of the inspection information detected by the in-tuner inspection device 39 will be described. The image information of the inner bottom surface of the laminate tube T from each of the CCD cameras 42a to 42l is the angular position of the rotary inspection table 12 detected by the rotary resolver 49, and the camera 42 which should take in the information.
Is specified, image information is selected from the camera, taken in, and transmitted to the mixer (mixer) 44. As is apparent from FIG. 3, when a certain laminated tube T reaches the point P ₄ , the subsequent laminated tube T has already reached the points P ₃ , P ₂ and P ₁ , so that four cameras are simultaneously operated. Image information from is captured. The mixer 44 modulates these four pieces of image information by predetermined carrier waves and mixes them. P. F. It outputs to the transmitting antenna 46 via 95.

The signal output to the transmitting antenna 46 is sent to the groove 110A for accommodating the antenna portion through the conductor wire 81, transmitted and received between the two antenna portions 121A, and the received signal is transmitted through the conductor wire 82. It is sent to the distributor 88 of the fixed block 86 described below.

The fixed block 86 distributes the received image information to four tuners, and the four RF converters 44a, 44b and 4 of the rotary block 85.
Tuners 89a, 89b, 89c, 89d corresponding to the frequencies converted by 4c, 44d, and memory units 20a, 20b, 20c, 20 for recording images reproduced by the four tuners 89a, 89b, 89c, 89d.
d, 21a, 21b, 21c, 21d, and video image checkers 90A, 90B for processing the image data stored in these memory units 20a to 20d, 21a to 21d into inspection data.

The mixed image information received by the antenna 46 is divided into frequency bands by the distributor 88 and sent to the tuners 89a to 89h to detect information signals.
Of the tuners 89a to 89d, the tuners 89a and 8d
The information signal from 9b is sent to the video image checker 90A. The information signals from the tuners 89c and 89d are sent to the video image checker 90B.

The image information is binarized by the video image checkers 90A and 90B. As a result, if no foreign matter, scratch, dust, etc. are found, an OK signal is output. If they are found, an NG signal is output, respectively. The signal output to 91 and amplified is used as the determination output. The determination of good / defective is made by, for example, binarizing the image information signal according to the brightness and determining the number of pixels in the dark portion.

On the other hand, the video image checker 90A,
From 90B, horizontal and vertical synchronizing signals for synchronizing the CCD camera 42 are respectively supplied to the amplifiers 92a to 92d, 93.
It is sent to mixers 94a and 94b via a-93d.
Each of the mixers 94a and 94b modulates a predetermined carrier wave and sends it to the groove of the fixed portion of the antenna unit 46.
Then, the carrier wave is received by the rotating unit of the antenna unit 46, distributed by the distributors 95a and 95b into signals corresponding to the horizontal and vertical synchronizing signals, and the amplifiers 96a to 96a-9.
6d, CCD camera 4 via buffers 97a, 97b
Sent to 2.

In the above embodiments, the transmitting antenna and the receiving antenna, which are ring-shaped conductors, have been described as ring-shaped plates. However, they may be ring-shaped, disk-shaped, or straight-shaped, and they may overlap in the radial direction. It may be in the shape of a heavy ring. This is because the action / effect remains the same.

Although only one antenna structure has been described, a plurality of antennas may be formed.

[0034]

As described above, according to the present invention,
Provided is a signal transmission device capable of transmitting and receiving signals in a non-contact manner between a rotating part and a fixed part and capable of performing signal transmission without being a noise source to the outside without noise from the outside being mixed. be able to.

Further, even if the transmitting side antenna and the receiving side antenna are in contact with each other, the electrical characteristics of the insulating sheet are secured.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a configuration diagram of a rotary tube inspection machine to which the signal transmission device of the present invention is applied.

FIG. 3 is an operation explanatory view of the rotary tube inspection machine.

FIG. 4 is a configuration diagram of the rotary tube inspection machine.

5A and 5B are a cross-sectional view and an equivalent circuit diagram of the antenna section in the above-described embodiment.

FIG. 6 is a configuration diagram of a main part of the antenna unit.

FIG. 7 is a configuration diagram of the antenna unit.

FIG. 8 is a perspective view of the antenna unit.

FIG. 9 is a diagram for explaining the field of view of the camera of the tube insertion portion in the embodiment.

FIG. 10 is a cross-sectional view of each portion of the tube insertion portion.

FIG. 11 is a block diagram of the rotary tube inspection machine.

[Explanation of symbols]

 45 ... Antenna part 49 ... Rotating resolver 110 ... Fixed part 110A-110C ... Groove 111 ... Rotating part 121 ... Coating 121A ... Antenna surface 130 ... Sliding contact part TF ... Teflon (insulating sheet)

Claims (3)

[Claims] 1. A metal coating is formed on both sides of a resin disk,
A signal transmission device in which one surface is used as a ground and the other surface is used as an antenna surface so that the antenna surfaces face each other to transmit and receive signals. 2. The signal transmission device according to claim 1, wherein the metal film is a copper film and the disk is a glass epoxy resin. 3. The signal transmission device according to claim 1, wherein an insulating sheet is arranged between the facing antenna surfaces.