KR100334407B1 - Signal transmission device - Google Patents

Abstract

The present invention relates to a signal transmission device, comprising: a first main body formed of an electromagnetic shielding material, a rotating shaft penetrated and fixed thereto, and rotating together with the rotating shaft around an axis of the rotating shaft, and made of an electromagnetic shielding material, A second main body fixed around the axis of rotation, and each peak point of the traveling wave component of the transmission signal generated on the element is arranged at a different position in the radial direction of the spiral element at least adjacent in the radial direction of the spirally formed element; Sufficient length to cover the first conductive element helically formed on the first base and excreted in the first body, and the first element formed on the second base and helically formed in the radial direction. Consisting of a second conductive element disposed in the second body, having a first width of and a second width in a direction perpendicular to the radial direction , It is possible to keep the amplitude level of traveling wave at a high level, thus enabling a stable signal transmission.

Description

Signal transmission device

The present invention relates to a signal transmission apparatus, and more particularly, to a signal transmission apparatus for transmitting a signal in a non-contact in a portion in which the signal transmitting and receiving portions relatively rotate.

In general, when the signal transmitter and receiver operate independently of each other, a radio transmission method using a transmission antenna and a reception antenna is used to perform signal transmission in a non-contact manner. However, in this wireless transmission method, noise and the like from the outside are inevitable, and therefore, there is a problem when accurate signal transmission is required. Thus, the inventors of the present invention propose a signal transmission apparatus capable of transmitting a signal in a non-contact manner when a signal transmitting portion and a receiving portion rotate relatively. Such signal transmission apparatuses are described in Japanese Patent Application No. 4 (1992) -70640, Japanese Patent Application No. 4 (1992) -291181, and the like. According to the above-described signal transmission apparatus, since signal transmission is performed in a non-contact manner between the transmitting side and the receiving side, it is possible to continuously transmit a signal even when the signal transmitting unit and the signal receiving unit are relatively rotated.

However, in such a signal transmission system, there are the following problems. First, in such signal transmission, signal transmission is performed by traveling wave components of the transmission signal. This traveling wave has a wavelength corresponding to the frequency of the signal to be transmitted, and signal transmission cannot be performed when the amplitude level of the traveling wave received at the receiving side is below a predetermined level.

Secondly, in such a signal transmission apparatus, there is a problem that the gain of the transmission signal does not flatten in the transmission band, but the transmission gain is changed by frequency. The gain of the transmission signal varies on the frequency axis, resulting in peak and bottom points. Therefore, when a plurality of signals are modulated and transmitted in a predetermined transmission band, the carrier frequency for modulation should be selected as the frequency of a peak portion with sufficient transmission gain, so the number of signals that can be transmitted is limited by the signal transmission characteristics. do. Moreover, since the transmission gain fluctuates greatly at the frequency slightly shifted from the peak point frequency, even if the peak point frequency is used as a carrier, the transmission accuracy is likely to decrease.

First, in such a signal transmission system, bidirectional signal transmission may be required in the signal transmission unit. For example, in an inspection system for judging good or bad of an article according to a photographing image of an inspection camera, in addition to transmitting the inspection image from the inspection section (rotation section) to the signal processing side (fixing section), It is necessary to supply a synchronization signal for controlling the inspection camera from the signal processing side to the inspection side. In such a case, conventionally, two signal transmission apparatuses, namely, inspection image transmission and synchronization signal transmission, are used together. However, depending on the type of system, it may be difficult to provide a plurality of signal transmission apparatuses in parallel. In addition, if bidirectional transmission is possible by one signal transmission device, the system can be simplified, and the control of the entire system can be simplified.

An object of the present invention is to provide a signal transmission apparatus capable of stably and efficiently transmitting traveling wave components of a signal having a high transmission gain.

Another object of the present invention is to provide a signal transmission apparatus that enables efficient signal transmission according to the type of signal to be transmitted.

Another object of the present invention is to provide a signal transmission apparatus which suppresses fluctuations in transmission gain in a transmission band and enables accurate and stable signal transmission.

It is still another object of the present invention to provide a signal transmission apparatus capable of transmitting signals in both directions.

According to one aspect of the present invention, there is provided a first body formed of an electromagnetic shielding material, a rotating shaft penetrating and fixed thereto, and rotating together with the rotating shaft about an axis of the rotating shaft, and formed of an electromagnetic shielding material, and surrounding the rotating shaft. The first main body fixed to the second body and the peaks of the traveling wave components of the transmission signal generated on the element so as to be arranged at different positions in at least adjacent winding directions of the spiral elements in the radial direction of the spirally formed elements. A first conductive element spirally formed on the base of the first conductive element, the first conductive element being formed on the first body and covering the first element formed on the second base and spirally formed in the radial direction; A second conductive element having a width of 1 and a second side in a direction perpendicular to the radial direction and comprising a second conductive element disposed in the second body; It provides a Trojan comprising a signal transmission apparatus.

According to the above-mentioned signal transmission apparatus, the first conductive element is formed in a spiral shape so that traveling waves of high amplitude level are radiated from the transmission element. Therefore, stable signal transmission is possible.

According to another aspect of the present invention, there is provided a first body formed of an electron shield material and having a rotating shaft penetrated therein and rotating around the axis of the rotating shaft together with the rotating shaft, and fixedly installed around the rotating shaft. On the first base such that each peak point of the traveling wave component of the transmission signal generated on the element and the second main body are located at different positions in the longitudinal direction of at least adjacent elements in the radial direction of the concentrically formed elements. A first conductive element formed substantially concentrically and disposed on the first body and having a first length of sufficient length to cover the first element formed on the second base and formed radially concentrically; Provided is a signal transmission device having a width and a second width in a direction perpendicular to the radial direction and comprising a second conductive element disposed in the second body. The.

According to the above-mentioned signal transmission apparatus, an image signal requiring high precision transmission is transmitted by a spiral element having a small signal degradation and a synchronization signal having a relatively large transmission accuracy by a ring element having a simpler configuration. As a result, it is possible to realize an inspection system that meets both the viewpoints of stability and manufacturing cost.

According to another aspect of the present invention, there is provided a first body formed of an electron shield material and having a rotating shaft penetrated therein and rotating around the axis of the rotating shaft together with the rotating shaft, and fixedly installed around the rotating shaft. A second main body to be converted, a first conductive element disposed on the first main body, a second conductive element disposed on the second main body, and an impedance of a signal to be transmitted, And a first balun that sends a plurality of signal supply points of one of the second conductive elements and a plurality of signal output points of the second element, and generates a signal by converting the impedance signal of the received signal. Provided is a signal transmission device comprising a second balun.

According to the above-described signal transmission apparatus, the signal to be transmitted through the balun is equally supplied to the plurality of supply points of the first conductive element, so that the reflection of the signal is absorbed. In addition, the distribution of the propagation intensity of the signal between the elements is averaged. According to the above operation, fluctuation in gain is suppressed in the transmission band, and stable signal transmission is possible. In addition, deterioration of the signal due to disturbance or variation in the physical shape of the element part is suppressed.

According to still another aspect of the present invention, there is provided a first body formed of an electron shield material and having a rotating shaft penetrated therein and being rotated around the axis of the rotating shaft, and formed of an electromagnetic shielding material, and fixed around the rotating shaft. A signal is passed through a second main body provided, a first conductive element disposed in the first main body, a second conductive element disposed in the second main body, and a first predetermined frequency band, Provided is a signal transmission device comprising a first duplexer for sending a passed signal to a first conductive element, and a second duplexer for receiving a signal from a second element and passing the signal within a second frequency band. .

According to the signal transmission apparatus described above, bidirectional signal transmission is possible in a system in which a part rotates.

Next, preferred embodiments of the present invention will be described with reference to the drawings.

Rotary Tube Inspector

First, a configuration of a rotary tube inspector to which the signal transmission device according to the present invention is applied will be described.

1 and 2 show the configuration of a rotary tube inspector to which the signal transmission device of the present invention is applied. The rotary tube inspector 2 includes a base 35, a motor 36, a rotation shaft 37, a rotation inspection table 12, a cam 46, and a cam follower 47. And the holder elevating rotary shaft 48, the center ring jig 38, the in-tube inspection device 39, the camera selector 43, the mixer 44, the antenna unit 45 serving as a signal transmission device, The rotary resolver 49, the fixed resolver 50, and the light amount checker 51 are provided. The rotary tube inspector 2 inspects the laminated tube T to generate an inspection image signal. The inspection image signal is transmitted to the signal processing unit through the antenna unit 45 as will be described later.

On the base 35, a fixed shaft (not shown) is provided, and the tubular rotary shaft 37 is provided so as to share the fixed shaft with the fixed shaft and to cover the fixed shaft. The rotary shaft 37 is configured to rotate by the motor 36. Moreover, in order to measure the angular position of the fixed shaft and the rotating shaft 37, the rotary resolver 49 and the fixed resolver 50 are arrange | positioned. The rotation test table 12 is coupled to the rotary shaft 37, and rotates in accordance with the rotation of the rotary shaft 37. On the rotation test table 12, a holder H for supporting the tube T is mounted. The holder H is moved up and down by the holder lifting and lowering shaft 48. The lifting and lowering operation of the holder H is performed by the cam follower 47 provided on the lower end of the cam 46 and the holder lifting and lowering shaft 48. The outlet H side of the laminate tube T can be fitted to the holder H. As shown in FIG. In addition, a centering jig 38 for holding the rear side of the laminated tube T in a circle is supported above the holder H. As shown in FIG. The in-tube inspection apparatus 39 for inspecting the inside of the laminated tube T includes an in-tube insertion portion 40, a bore scope 41, and a CCD camera 42. The bore scope 41 includes a bore scope body 52 and a bore scope insertion portion 53. The tube insertion portion 40 includes a bore scope insertion portion 53, a light emitting diode portion 54, and a photosensor portion 55. Among these, the borescope insertion section 53 is mainly inspected on the inner bottom side, that is, the exit port side, in the drawing of the laminate tube T, and the light emitting diode section 54 and the photosensor section 55 of the laminate tube T Inspect mainly on the inner side.

Next, the operation of the rotary tube inspector will be described with reference to FIGS. In FIG. 1, the laminated tube T is mounted on the holder H and conveyed to the star wheel 11 by the conveyance conveyor 9 etc. In FIG. The star wheel 11 blows the laminated tube T on the rotational inspection table 12 of the rotary tube inspector 2 for each holder H. After being blown onto the rotating inspection table 12, the holder H is moved up and down in accordance with the lifting and lowering of the holder lifting and lowering shaft 48 according to the cam curve of the cam 46, and intermittently around the axis of the holder lifting and lowering shaft 48. Perform a rotary motion. That is, as shown in FIG. 3, the laminate tube T rotates at the inspection position while revolving around the rotation axis 37 in the rotational direction of the rotation inspection table 12, at which time the laminate tube T pauses rotation for a predetermined time at points P _{1 to} P _{4 in} the drawing. As the holder H rises, the laminate tube T also rises, and the tube insertion portion 40 of the in-tube inspection apparatus 39 is inserted into the laminate tube T held in a circle by the centering jig 38. Thus, in the state in which the tube insertion part 40 was inserted in the inside of the tube, the laminated tube T intermittently rotates between the points P _{1 to} P ₄ , thereby using the in-tube inspection apparatus 39. In this section, the tube inner bottom and the tube inner side can be inspected. In addition, before the tube inserting portion 40 is inserted into the laminate tube T, the light quantity checker 51 checks the light quantity of the light emitting portion, and the result is used during data processing. In the case where the amount of light is less than the reference value, an alarm can be issued to replace the light emitting part.

Next, a more detailed configuration and operation of the tube inserting portion 40 will be described with reference to FIGS. 4A to 4D and FIGS. 5A to 5D. FIG. 4A shows a cross section in the AA direction of the tube insertion portion 40 in the state of being inserted together with the bore scope in the laminate tube T, and FIG. 4B shows a cross section of the bore scope insertion portion 53. 4C is a sectional view in the BB direction of the tube insertion portion 40 shown in FIG. 4A, and FIG. 4D is a sectional view in the CC direction. The tube insertion portion 40 includes a light emitting diode portion 54 and a photo sensor 55a, 55b, 55e, 55d, 55e, which are fixed to the borescope insertion portion 53 by a joining tool 56 and a bolt 57. 55f) is mounted. The end surface D of the bore scope inserting portion 53 is shown in FIG. 4B. The bore scope inserting portion 53 is provided with a lens portion 60 for capturing an image inside the stainless tube 58, and a light source fiber portion 59 including fine glass fibers around the lens portion 60. Is excreted. In FIG. 4B, the end face D of the bore scope insertion section 53 is perpendicular to the axis center of the bore scope insertion section 53, but this may be a shape cut inclined so as to have an angle with respect to the axis center. In this case, the field of view is enlarged not only vertically downward but also in the oblique direction. The bore scope insertion section 53 is eccentric from the axis of the laminate tube T, and its positional relationship is shown in Figs. 5A to 5C. That is, in this case, the testable region F ₁ of the bore scope insertion section 53 becomes a quadrant shape from the square camera field V except the mask portion (the diagonal portion M). Since the laminated tube T temporarily stops at points P ₁ , P ₂ , P ₃ , and P ₄ by intermittently rotating as shown in FIG. ₃ , the inspectable area F ₁ at the point P ₁ is stopped. The inspection possible area F ₂ can be inspected when the point P ₂ is stopped. Hereinafter, similarly it is possible to check that each of the inspection area F ₄ F ₃ the inspection area at the time of stop of the P _3, at the time of the point P ₄ stop. Thus, by dividing the inspection area as shown in Figs. 5A and 5C, and imaging and inspecting by approaching the inner bottom, the borescope at the center of the laminated tube T as shown in Figs. 5B and 5D. By fixing the insertion section 53, the resolution can be further improved as compared with the inspection as one inspection area, and it is possible to detect a defect such as finer mixed matter and phase mixing. The inspection area is not limited to four divisions, and may be any other number.

On the other hand, the light emitting diode part 54 has a length covering the inner bottom surface of the laminate tube T from the upper opening surface, and can project the inner surface from the upper end to the lower end. Each of the photosensors 55a to 55f is disposed three on each side with the light emitting diode portion 54 interposed therebetween, and these sensors are arranged so that the inspection areas overlap as shown in FIG. 4C. With this arrangement, the photosensors 55a to 55f are in a period in which the laminate tube T is rotating, i.e., in a period excluding a period of stopping at points P ₁ , P ₂ , P ₃ , and P ₄ in FIG. 5. Inner side can be inspected. Here, the photosensors 55a to 55f may be arranged in one row, or may be a photoelectric conversion element other than the photosensor, for example, a CCD element.

Next, the processing of the detected inspection image signal in the in-tube inspection apparatus 39 will be described. For the sake of simplicity, only the processing of the inspection image signal detected by the CCD camera 42 will be described. 6 is a block diagram showing an image signal processing unit on the inner bottom surface of the laminate tube T. FIG. The signal processing unit is roughly divided into a rotating unit 85 and a fixing unit 86. The rotating unit 85 corresponds to the tube inspector 2 side and detects an inspection image signal using the CCD camera 42. The fixing portion 86 is an apparatus for determining the characteristics of the laminated tube T based on the inspection image signal detected by the CCD camera 42 at the rotating portion 85. The inspection image signal is supplied to the antenna portion 45, and the antenna portion 45 transmits the inspection image signal to the fixed portion 86 while one of the antenna portions 45 is rotating. Details of the antenna unit will be described later. As shown in FIG. 6, the rotating part 85 divides 12 CCD cameras 42a-42l, and 12 CCD cameras into three groups by making three cameras into one group, and selects one of three cameras, Video selectors 43a, 43b, 43c, 43d for selecting an inspection image. The inspection image selected by the video selectors 43a, 43b, 43c, 43d is converted in the RF converter, and the information is amplified by the RF amplifiers 44e, 44f, 44g, 44h. The signals amplified by the SF amplifiers 44e, 44f, 44g, 44h are passed through the band pass filters (BPFs) 44i, 44j, 44k, 44l, followed by four video selectors 43a, 43b, 43c, 43d. Is sent to a mixer 44 that mixes the selected signal from the. The signal output from the mixer 44 passes through the BPF 95 and is sent to the antenna portion 45a. The antenna portion 45a transmits a signal from the rotating portion 85 to the fixed portion 86 in a non-contact state while the rotating portion side of the antenna portion rotates. Details of the antenna corresponding to the signal transmission device of the present invention will be described later.

The image signal is sent from the antenna portion 45a to the divider 88. The fixing unit 86 corresponds to a divider 88 for distributing the received image information to four tuners, and a frequency converted from the divider 88 by the four RF converters 44a, 44b, 44c, and 44d described above. Memory units 20a, 20b, 20c, 20d, 21a, 21b and 21c for recording images reproduced by one tuners 89a, 89b, 89c and 89d and the four tuners 89a, 89b, 89c and 89d described above. , 21d). The image data stored in these memory units 20a, 20b, 20e, and 20d is transmitted to video image checkers 90A and 90B which process this image data. The data processed by the video image checkers 90A and 90B is subjected to determination output via the output amplifiers 91a and 91b. On the other hand, the horizontal vertical synchronization signals are output from the video image checkers 90A and 90B, respectively, and amplified by the signal amplifiers 92a and 92b, and then the synchronization signals from the signal amplifiers 92a and 92b are transmitted to the fixed part. The amplifiers are transmitted to and amplified by the amplifiers 93a, 93b, 93c and 93d, respectively. Thereafter, the synchronization signals from the amplifiers 93a, 93b, 93c, and 93d are mixed in the mixers 94a and 94b, and are rotated by the rotating unit 85 through the BPFs 99a and 99b and the antenna units 45b and 45c. Is sent to. The signal received at the antenna portion on the side of the rotating portion 85 is distributed by the divider 98 to two sets of amplifiers on the receiving side. The signals output from the amplifiers 96a, 96b, 96c, and 96d are distributed to the CCD cameras 42a to 42l through the buffers 97a and 97b. At this time, the synchronization signal is distributed such that each video checker corresponds to each camera taken as the charge of each video check. This synchronization signal is transmitted from the CCD camera together with the image signal, and the fixing unit 86 identifies the image signal by the synchronization signal. The image signals are binarized by the video image checkers 90A and 90B, and as a result, an OK signal is output if no foreign matter, scars, dust, etc. are found, and an NG signal is output to the output amplifiers 91a and 91b. The amplified signal is output from these output amplifiers as a judgment output indicating the characteristic of the laminated tube T.

Signal transmission device

Next, a preferred embodiment of the signal transmission apparatus according to the present invention will be described.

(1) First embodiment

7 to 9 show the configuration of the signal transmission apparatus of the first embodiment. 7 is a side view of the signal transmission device 45. As shown in FIG. 7, the signal transmission device 45 includes a transmitter 100 and a receiver 110. FIG. 8 is a plan view illustrating the interior of the transmitter 100 and FIG. 9. The transmitter 100 and the receiver 110 are rotatably coupled in the vertical direction as shown in FIG. 7 to be integrated, and are sealed to form an electromagnetic shield from the outside. The transmitter 100 and the receiver 110 are always opposed to each other even when one of them rotates, can transmit and receive image signals stably, and is electronically shielded, so that they are not affected by noise from the outside. It also does not serve as a noise source to the outside. The transmitter 100 and the receiver 110 are formed of, for example, Al (aluminum) in consideration of the electron shield characteristics. The transmitting part 100 is formed with a hole 108 for penetrating the rotating shaft 37 and fixing the transmitting part 100 to the rotating shaft 37, and the transmitting part 100 also rotates in accordance with the rotation of the rotating shaft 37. . In the transmitter 100, a mixer 44, a BPF 95, and the like, which are not shown in FIG. 7, are incorporated. The signal supplied from the BPF 95 is sent to the transmission element base 101 arranged horizontally in the transmitter 100. The shape of the transmission element surface of the transmission element base 101 is shown in FIG. 10A. The transmission element base 101 is formed by spirally forming a copper transmission element 103 on the glass epoxy base 102. The transmission signal from the mixer 44 is radiated from this transmission element 103. On the other hand, a ring-shaped groove 111 is formed in the receiver 110, and as shown in FIG. 7, the receiving element base 112 is horizontally disposed in the groove 111. The shape of the receiving element base 112 is shown in FIG. 10B. The receiving element base 112 is formed by spirally forming a receiving element 114 made of copper for 1/4 wavelength of the transmission signal on the glass epoxy base 113. When transmitting a signal, the transmitter 100 is rotated by the rotary shaft 37 while the receiver 110 is fixed. The transmitting element base 101 and the receiving element base 112 face each other at intervals of about 5 mm. Accordingly, the transmitting unit 100 rotates by the rotation of the rotary shaft 37, and the receiving element base 112 rotates relatively on the transmitting element base 101 while maintaining a distance from the transmitting element base 101. As a result, signal transmission is performed. The transmitter 100 and the receiver 110 input and output signals to the BNC connectors 104 and 105 and lead wires (not shown), respectively. In addition, the transmitting element base 101 and the receiving element base 112 may be relatively moved, and it may be rotated inherently.

Next, a signal transmission method will be described. In the present invention, signal transmission between a transmitting element and a receiving element is performed by traveling waves generated in the transmitting element, that is, current (capacitance) coupling using a current component. Therefore, it is necessary to radiate a high level traveling wave more efficiently from the transmission element. Thus, in the present invention, the transmitting element is spirally wound so that the traveling wave radiated from the transmitting element has a high amplitude level.

Next, a method of forming the transmission element will be described. For example, if the transmission signal frequency is 500 MHz, a traveling wave of about one wavelength of about 60 cm is generated, and signal transmission is performed by this traveling wave. As shown in FIG. 11, the traveling wave has a constant amplitude, and there is a difference in amplitude level between the peak (mountain) portion and the other (valley) portion. Therefore, if this traveling wave is transmitted as it is, sufficient signal transmission may be performed in the level portion above a certain level, but sufficient signal transmission may not be performed in the amplitude portion below it. Therefore, in the present invention, the transmission elements are wound in a helical manner a plurality of times, and portions of the transmission elements that are wound are supplemented with small amplitude levels to stabilize the amplitude levels of the entire transmission elements at a high level. 12 is a diagram schematically showing this method. For one linear transmission element, as shown in FIG. 11, a traveling wave is generated depending on the transmission signal frequency. Such a linear element is used as a spiral coil. However, if one focuses on one radial direction of a long elongated transmission element, for example, the peak of the first wave and the peak of the second valley are When the element is wound so as to coincide in the radial direction, the amplitude of the traveling wave of this part is maintained at a value close to the peak value (value of the mountain part) as a whole. In addition, even if peaks around each other do not ride on exactly the same radius, if a portion having a small mutual amplitude is supplemented with a portion having a large amplitude, the amplitude as an entire element becomes a value close to the peak value. For simplicity, the case where the amplitude level is supplemented by three elements is shown in FIG. 12A, and the case where each line is considered parallel is shown in FIG. 12B. If the element is wound three times, the components of each traveling wave in the radial direction R are combined and stabilized at a level close to the peak value as in the tangent line of FIG. 12B. In this way, by combining the amplitudes of the traveling waves, the amplitude of the traveling waves radiated as the entire coil element can be set to a high level.

Next, specific examples of the transmission element thus formed will be described with reference to FIGS. 11 and 13. 11 is a transmission element, which shows a linear conducting line having a length of three traveling waves in theory. Since the length of the transmitting element is three wavelengths, the traveling wave is arranged on the element as shown in FIG. Each point of the element is called P _A to P _M by focusing on the amplitude of the traveling wave as shown in FIG. Such an element is spirally wound from the inner side to the outer side as shown in FIG. Here, the circumference of the transmission element is divided into 12, and twelve radial points P0 to P11 are arranged. Each point P _{A to} P _M on the element in FIG. 11 corresponds to each point (black point) in FIG. Now, focusing on the point P0, if each point of the radial element is P01 to P05, the amplitude level of the traveling wave of the corresponding point on the element becomes as shown by the dotted arrow in Fig. 11, and similarly the radial P5 The amplitude level of the traveling wave at the point also becomes as shown in FIG. Thus, the result of having calculated the component of the traveling wave with respect to all the radial directions of P0-P11 is shown in FIG. From this result, the component of the amplitude of the traveling wave as the whole element is as shown in Fig. 15, and the amplitude level is changed to a value close to the peak value. Incidentally, in FIG. 13, although the starting point P _A and the middle point P _M of the element are located on one radius, it is not necessary to coincide with the starting point and the end point of the element if the amplitude of the traveling wave is supplemented between the elements. .

Next, the specific structure of the transmission / reception element will be described. Fig. 16 shows the relative positional relationship between the transmitting element and the receiving element, and Fig. 17 shows the cross section by J-J of the transmitting / receiving element in Fig.16. The transmitting element 103 is spirally formed on the glass epoxy substrate 102, and a GND surface 109 is disposed on the rear surface of the glass epoxy substrate 102. In addition, all parts on the transmission element 103 have an impedance of 50? With respect to the GND side 109. In addition, the transmitting element 103 is formed so as to have an impedance of 50 Ω uniformly even between adjacent lines formed in a spiral shape. In addition, the resistance in FIG. 17 shows the resistance value of each element, and is not actually excreted. In this way, by forming the transmission element, it is possible to supplement the amplitude components of the traveling wave generated in each part of the element with each other and to have a high level as a whole. On the other hand, the receiving element 114 is also formed spirally on the glass epoxy base 113, and is configured to maintain an impedance of 50Ω between the GND surface 119. As a result, impedance matching between the transmitting side and the receiving side can be achieved. The receiving element does not necessarily have to be formed in a spiral shape as shown in FIG. 10B, but at least has a constant width x that radially covers the transmitting element 103 formed in a spiral shape and has a constant width y in the tangential direction of the transmitting element. It is composed. The width x is required for the receiving element in order to take full advantage of the effect of spirally winding the element on the transmitting element side. In addition, by setting the width y of the receiving element, the level of the traveling wave in one tangential direction is averaged, thereby enabling more stable signal transmission.

In the above description, the transmitting element is formed on the plane base, but may be formed on a three-dimensional gas surface as described below. Examples of transmission elements of other aspects will be described. Fig. 18A shows the transmitting element spirally disposed on the outer circumferential surface 201 of the conical body formed coaxially with the rotation axis. In this case, the transmission element may be disposed again on the bottom 202 of the cone replacement. 18B is a cross-sectional view of a hollow cone cylindrical body formed on a rotating shaft. In this case, elements may be disposed on the inner circumferential surface 204 in addition to the elements on the outer circumferential surface 203 and the bottom 205. . 19A is a sectional view of a hollow cone cylindrical body having another configuration similar to that of FIG. 18B, but is advantageous in the manufacturing process in that it is not necessary to penetrate the head of the cone as shown in FIG. 18B. 19B shows the transmitting element disposed on the outer circumferential surface 210, the upper surface 209, and the bottom surface 211 of the columnar controller formed coaxially with the rotation axis. As a variant of this, as shown in FIG. 20, the transmission element may be disposed on the inner circumferential surface 212, outer circumferential surface 213 or side surface 214 of the cylindrical cylinder. In the case of Figs. 18 to 20, it is preferable that the receiving elements are bent in accordance with the curvature of the main surface such as the conical body and the cylinder, and the intervals between the transmitting and receiving elements are always kept constant. These elements are particularly advantageous in the case of multi-channel transmission of the transmission signal compared to the above-described planar type. This is because in these three-dimensional elements, transmission elements and reception elements can be formed on various surfaces, respectively, and multi-channelization can be easily performed.

Next, Fig. 21 to Fig. 25 show another embodiment in the case where the transmitting element is formed on the plane base. Fig. 21A is a combination of three elements having a length corresponding to one-half of the wavelength of the traveling wave to supplement the components of the traveling wave with each other. In Fig. 21B, four elements are similarly combined. In Fig. 22A, six elements are arranged, and in Fig. 22B, eight elements are arranged in the circumferential direction. In these embodiments, since a plurality of elements are used, the signal to be transmitted differs from the elements of the above-described type in which the elements are fed spirally in a spiral manner, but each element supplements the traveling wave component in the radial direction. The effect is the same, and by adjusting the position where each element is arranged, it is possible to further improve the complementary effect of the traveling wave component in the radial direction of the element. 23A and 23B show examples of other transmission elements. These elements are arranged in the circumferential direction in the same manner as in FIGS. 21A, 21B, 22A, and 22B, but the end portions of the elements are coiled. This is to secure the space by forming the tip of each element in the form of a coil in consideration of the element-based area, the effective length is the same as in the case of 21A, 21B and 22A, 22B and the like. Figure 23A uses five elements and Figure 23B uses eight elements. In the example of FIGS. 23A and 23B, the distal end portion of each element is formed in a rectangular coil shape, but as shown in FIGS. 24A to 24C, a branch, a saw tooth shape, or a plurality of branches again ( You may form with a branched element. The above-described elements may be formed in a reverse range as in the relationship between the 21st and 25th degrees. 25B is an example of another transmission element. This uses elements with six wavelengths of traveling waves, and supplements the traveling wave components in the tangential direction and reduces the components occurring in the radial direction.

Next, another example of the receiving element will be described with reference to FIGS. 26 to 28. FIG. 26A and 26B show a plurality of elements arranged at predetermined intervals in the circumferential direction. In FIG. 26C and FIG. 26DD, one element is repeatedly folded and arranged so that each bending portion overlaps a plurality of times in the radial direction. In the case of the receiving elements in FIGS. 26A and 26B, since they are formed of a plurality of elements, the reception signal is output from each element. 27A to 27C, 28A and 28B are formed according to the same idea as the receiving element shown in FIGS. 26A to 26D, and the length of the corresponding transmission element in the circumferential direction is longer. It is.

As described above, according to the first embodiment, since the transmitting element is configured to spirally wound, the amplitude level of the traveling wave can be maintained at a high level from the transmitting element, thereby enabling stable signal transmission.

(2) Second Embodiment

Next, the signal transmission device of the second embodiment of the present invention will be described. In this second embodiment, the pair of helical elements shown in FIGS. 8 to 10 and the pair of ring-like elements are used in combination. As described above, the spiral elements shown in FIGS. 10A and 10B have high accuracy and reliability in signal transmission. However, these spiral elements are relatively expensive. On the other hand, the ring-shaped element (refer also to FIG. 33A) of a simple structure has a low manufacturing cost compared with a spiral element. In this regard, in the second embodiment, the spiral element and the ring element are combined and used according to the type of signal to be transmitted. As shown in FIG. 6, in the laminated tube inspection machine, the inspection image signal is transmitted from the rotating unit 85 to the fixing unit 86 via the antenna unit 45, and at the same time, the synchronization signal is transmitted through the antenna unit 45. It is transmitted from the fixing part 86 to the rotating part 85. Here, the inspection image signal indicates the presence of a scar or dust information signal indication on the inner surface of the laminate tube, and therefore, the transmission of the inspection image signal requires high precision. On the other hand, the synchronizing signal is a control signal of the CCD camera, and even if the synchronizing signal is slightly degraded within the camera's allowable range, basic and operation errors do not occur in the system. In this respect, in this embodiment, the inspection image signal is transmitted by the spiral element, and the synchronization signal is transmitted by the ring element, thereby meeting the demand of reliability of the system and reduction of manufacturing cost.

Next, the concentric circular antenna portion of the second embodiment will be described with reference to FIGS. 29 to 32. FIG. FIG. 29 is a perspective view of the transmitter 200 and the receiver 250, and FIG. 30 is a plan view and a cross-sectional view of the transmitter 200. As shown in FIG. 30, the transmitter 200 is cylindrical, and the hole 207 for fixing to the rotating shaft 37 is formed in the center part. The transmitter 200 also rotates in accordance with the rotation of the rotary shaft 37. On the base 201 of the transmitter 200, a synchronous reception element base 205 for synchronizing signal transmission and an image transmission element base 202 for image signal transmission are disposed. In the transmitter 200, a mixer 44, a BPF 95, and the like are incorporated. The image signal supplied from the BPF 95 is sent to the image transmission element 203 on the image transmission element base 202. The image transmission element 203 is formed by spirally forming a copper transmission element 203 on a base 202 of a glass epoxy agent. The image signal from the mixer 44 is radiated from this transmitting element 203. The synchronous receiving element is formed by forming a copper ring element 206 on the same glass epoxy base 205. On the other hand, the receiver 250 shown in FIG. 31 also has a circumferential shape, and the rotation shaft 37 is fitted into the hole 257 formed in the center thereof. In addition, grooves 258 and 259 are formed concentrically on the end surface of the receiver 250 facing the transmitter 200. In the grooves 258 and 259, an image receiving element 253 for image signal transmission and a synchronous transmission element 255 for synchronous signal transmission are disposed, respectively. The image receiving element 253 is formed on the glass epoxy substrate 252 by spirally forming a copper element 253 of 1/4 wavelength of the transmitted signal. In addition, the synchronous transmission element 255 is formed of a ring-shaped element 255 made of copper on the glass epoxy base 254 in the same manner as the synchronous reception element 206. As shown in FIG. 32, the transmitter 200 and the receiver 250 are coaxially coupled to each other so as to be rotatable in the circumferential direction thereof, and are integrated with each other, as in the first embodiment. When the signal is transmitted, the transmitter 200 is rotated by the rotation shaft 37, while the receiver 250 is fixed. As shown in FIG. 33A, the back of each element base 202, 205, 252, 254 is a GND plane. In addition, by forming the synchronous transmission element 255 and the synchronous reception element 206 on the epoxy base such that each is 50?, Impedance matching between the two is achieved (see also 33B).

Next, other embodiments of the signal transmission device of the second embodiment will be described with reference to FIGS. 34 and 35. FIG. In Fig. 34, the receiving section 211 is formed by forming an image receiving element 212 on the lower surface of a cylindrical body having a convex portion and a synchronous transmission element 213 on the side surface of the convex portion. In addition, the transmitting unit 261 is an image transmitting element on the upper surface of the cylindrical body 261 having a center hole 264 fitted with the convex portion of the receiving unit, that is, the image receiving element 212 is in contact with the receiving unit 211 disposed thereon. 262 is formed by forming a synchronous receiving element 263 on the inner surface of the center center 264. When the receiver 211 and the transmitter 261 are combined, as shown in FIG. 35, the synchronous transmission element 213 and the synchronous reception element 262 face each other at predetermined intervals. Further, the image transmitting element 262 and the image receiving element 212 face each other at predetermined intervals. A center hole 214 is formed in the receiver 211, and the rotation shaft 37 penetrates the center hole. In accordance with the rotation of the rotary shaft 37, the receiving unit 211 rotates, and each transmitting / receiving element 212, 262 and 213, 263 of the synchronization / image face each other and rotate relatively. As a result, the image signal is transmitted from the transmitter 261 to the receiver 211, and the synchronization signal is transmitted from the receiver 211 to the transmitter 261. The image transmitting element 262 and the image receiving element 212 have the same structure as the elements 203 and 253 shown in FIG. 30 and FIG. The synchronous transmission element 213 and the synchronous reception element 263 have concentric ring shapes of different diameters, but are formed as GND surfaces on both rear surfaces of the elements 213 and 263.

Next, another aspect of the second embodiment will be described. As shown in FIG. 37, the antenna portion of this aspect is constituted by attaching the image transmission unit 45a and the synchronous transmission unit 45b separately and in parallel to the common rotation shaft 37. As shown in FIG. That is, the image receiving unit 221 is fixed, while the image transmitting unit 271 is rotatably disposed around the central cylinder 190. Accordingly, the image transmitting unit 271 also rotates together with the cylinder 190 in accordance with the rotation of the rotary shaft 37, and the image signal is transmitted by the image transmitting element 272 and the image receiving element 222 facing each other. All. The lead wire hole 191 is formed in the center cylinder 190 in the vertical direction, and the synchronous signal line 223 is connected to the synchronous transmission unit through this hole. As shown in FIG. 36B, an element 232 is disposed in the image transmission unit 231, and an element 282 is disposed in the synchronous reception unit 281. As shown in FIG. The synchronization receiving unit 281 rotates when the synchronization signal is transmitted. In this way, when the number of channels of the transmitted image inspection signal is increased by separately separating the synchronous transfer unit and the image transfer unit, a new image transfer unit may be added to the rotating shaft 37 to facilitate improvement of the system. Become.

As described above, according to the second embodiment, an image signal requiring high accuracy transmission is performed by a spiral transmission element, and a synchronization signal having a relatively large allowable signal accuracy is obtained by a ring-shaped element having a simpler configuration. Since transmission is made, it is possible to provide an inspection system excellent in precision and cost depending on the signal to be transmitted.

(3) Third embodiment

Next, a third embodiment of the signal transmission apparatus of the present invention will be described. 38 is a side view showing the configuration of the antenna section 45 of the third embodiment. As shown in FIG. 38, the antenna unit 45 includes a transmitter 300 and a receiver 310. 39A is a plan view of the transmitter 300 and FIG. 39B is a plan view of the receiver 310. The transmitter 300 and the receiver 310 are rotatably coupled up and down in the vertical direction as shown in FIG. 38, and are sealed to seal the inside of the antenna unit 45 from the outside. Since the transmitter 300 and the receiver 310 always face each other even when one of them rotates, and can transmit and receive information signals stably during the rotation, and the antenna unit 45 is electronically shielded, signal transmission is performed externally. Unaffected by noise from Signal transmission also does not serve as a noise source to the outside. The transmitter 300 and the receiver 310 are electromagnetic shielded, and the transmitter 300 and the receiver 310 are formed of Al (aluminum) or the like in consideration of the shield characteristic. The transmitter 300 is formed with a hole 318 for penetrating the rotating shaft 37 and fixing the transmitting unit 300 to the rotating shaft 37. The transmitting unit rotates around the rotating shaft 37 in accordance with the rotation of the rotating shaft 37. 300 also rotates. The signal supplied from the BPF 95 is sent to the transmission element 301 arranged horizontally in the transmitter 300. The transmission element 301 is formed by combining the base 301a and the base 301b approximately parallel with a predetermined interval. The shape of the base surface of the bases 301a and 301b is shown in FIGS. 40A and 40B. The bases 301a and 301b are formed by forming copper elements on a glass epoxy base in the shapes shown in FIGS. 40A and 40B. A balun, which will be described later, is disposed in a portion of the base 350 on the base 301a. Transmitted signal from mixer 44 is emitted from this element 301. On the other hand, a ring-shaped groove 311 is formed inside the receiving unit 310, and the receiving element 312 having the same shape and the same structure as the transmitting element 301 shown in FIG. It is. Thus, by making the transmission / reception elements 301 and 312 the same shape, the frequency characteristics of both elements become the same and the output signal level is stabilized, which is particularly effective for the bidirectional transmission described later. When transmitting a signal, the transmitter 300 is rotated by the rotation shaft 37 while the receiver 310 is fixed. The transmitting element 301 and the receiving element 312 face each other at an interval of about 3 mm. Therefore, as the rotation shaft 37 rotates, the receiving element 312 rotates relatively on the transmitting element 301 while maintaining a distance from the transmitting element 301, thereby transmitting a signal. The transmitter 300 and the receiver 310 input and output signals by the BNC connectors 304 and 315 and lead wires (not shown), respectively. In addition, the transmitting element 301 and the receiving element 312 may be moved relative to each other. The transmission / reception elements 301 and 312 made of a conductive material are preferably in a closed ring (loop) shape so that signals are supplied and supplied equally to the plurality of signal supply points and signal output points.

Next, a signal transmission method will be described. FIG. 41 is a block diagram showing the configuration of the transmitting element 301 and the receiving element 312, and FIG. 42 is a diagram showing the specific circuit configuration. As shown in FIG. 39, the transmitting element 301 has a footing 301a and a footing 301b, and the three baluns 351 to 353 are sandwiched between the two footings 301a and 301b. Excreted. That is, in the transmitting element 301, three baluns 351 to 353 are disposed in the portion 350 of the base 301a shown in FIG. 40A, and the signals output from the balun 352 and the balun 353 are Each of the elements is supplied to the four signal supply contacts A _{1 to} A ₄ on the base 301a through conductive elements of equal length. These supply points A _{1 to} A ₄ are arranged at positions having an angle of about 90 ° to each other, and are connected to corresponding points of the opposite base 301b with lead wires or the like. Thus, the signal S _i supplied to the transmission element 301 is radiated from the element E ₅ surface of the base (301b) shown in the FIG 40B. 41 and 42, the base 301a is omitted for convenience of description, and only the base 301b is shown. The receiving element 312 also has the same configuration as the transmitting element 301, and arranges three baluns 354 to 356 between the bases 312a and 312b and supplies four of the baluns 354 and 355. It is connected to four signal output points B _{1 to} B _{4 which} are offset by approximately 90 degrees on the point and the base 312b. Therefore, as shown in FIGS. 41 and 42, the transmitting element 301 and the receiving element 312 oppose each other with the element surfaces 301b and 312b in the shape shown in FIG. 40B facing each other. Signals are transmitted and received by the element surfaces 301b and 312b.

Next, the operation of the antenna unit 45 will be described with reference to FIGS. 41 and 42. FIG. The inspection signal S _i generated by the inspection unit 85 of the tube inspector described above is input to the balen 351. Balun is generally a circuit for converting from an unbalanced line to a balanced line or vice versa, and the balun 351 is formed by a transcoupling circuit by coils facing each other as shown in FIG. Consists of. In the balun 351, the input coil L _a has an impedance of 50 Ω and the output coil L _b has an impedance of 1 kΩ. As a result, the test signal S _i is converted into an impedance and divided into two signals S _a and S _b . . The signals S _a and S _b are input to the balun 352 and the balun 353, respectively. Similar to the balun 351, the baluns 352 and 353 are constituted by a transcoupling circuit, but unlike the balun 351, the input coil L _b has an impedance of 1 k? And the output coil L _c has a impedance of 50?. Therefore, the signals S _a and S _b are output as two signals S ₁ , S ₂ and S ₃ and S ₄ converted to an impedance of 50 Ω, respectively. In this way four-divided signal S ₁ ~S ₄ is supplied to the four supply point A ₁ ~A ₄ on the base (301b). Transmitting element 301 and receiving element 312 is acting as a kind of capacitor in the signal transmission, the signal S ₁ ~S ₄ is emitted from the four points A ₁ ~A supply _4, the receiving element by the capacitance coupling Is received at 312. That is, in the bases 301b and 312b facing each other, the signal radiated from the ring-shaped element E ₅ on the base 301b shown in FIG. 40B propagates between elements, and is caused by the ring-shaped element E ₅ on the base 312b. Is received. The reception element 312 has the same configuration as the transmission element 301 as described above, and the signal received by the reception element E ₅ is output from four output points B _{1 to} B ₄ . The output signal is converted into impedances of 50 Ω, 1 kΩ, and 50 Ω by the baluns 354 to 356 having the same configuration as the baluns 351 to 353, and are combined into a signal of 1 and output as the received signal S ₀ . It is sent to the inspection signal processing unit at the next stage.

The characteristic of the signal transmission device constructed as in the third embodiment is that a balan is interposed between the signal input side / signal output side and the transmission / reception element, and by this balun the transmission signal is equally supplied to a plurality of points of the transmission element. In addition, the present invention is to evenly output a reception signal from a plurality of points of the reception element. By interposing the balun in this manner, the impedance matching between the signal input / output side and the transmission / reception element is improved, and the reflection of the signal is absorbed and suppressed. In addition, since the conversion to the high impedance is performed by the balun, influences such as noise caused by the appearance of the transmission / reception element portion, fluctuations in the capacity of the element portion due to irregularities in the physical shape of the element portion, and the like are suppressed. Further, the signal is supplied to the plurality of points of the transmitting element evenly through the balun, and the signal is output evenly from the plurality of points of the receiving element, so that the distribution of the propagation intensity of the signals between the elements is averaged. By the above-described action, variations in transmission characteristics between transmission and reception elements are suppressed. The transmitting element 301 and the receiving element 312 are connected to each supply contact A _{1 to} A ₄ and each output point B _{1 to} B ₄ by elements of the same length through the balun as shown in FIG. As a result, variations in signal amplitude, phase shifts, and the like at each supply point and output point do not occur, and are emitted from an element under the same conditions, thereby contributing to the uniformity of signal propagation strength between elements. 43 shows transmission characteristics by the signal transmission apparatus according to the third embodiment. 44B and 45B show transmission characteristics of the signal transmission apparatus shown in FIGS. 44A and 45A. From these figures, it was found that the fluctuation of the gain in the band of the transmission signal is suppressed.

In the signal transmission device 45, the transmission element 301 and the reception element 312 are configured to face each other at predetermined intervals. In an actual experiment, both elements 201 and 312 oppose the transmitting and receiving elements at intervals of about 3 mm. When the opposing intervals of both elements are narrowed, the transmission gain itself increases, but the relative positional relationship between the four supply points on the transmission element 301 and the four signal output points on the reception element 312 is caused by the rotational movement of the elements. As a result, the transmission gain fluctuates greatly in time depending on this relative positional relationship. The narrower the gap between elements, the greater the variation in transmission gain. Therefore, both elements need to have opposing intervals such that the intensity of the signal emitted from each feed contact is somewhat uniform by any signal output point of the receiving element. In the above embodiment, the number of supply points on the transmitting element 301 and the signal output point on the receiving element 312 is four. However, increasing the number of signals results in a more averaged deviation of the propagation intensity of the signal, resulting in more transmission gain. This enables signal transmission with little variation. In the above embodiment, the number of supply points and signal output points are made equal, but by varying the numbers, it becomes possible to further average the propagation intensity due to the rotation of the transmission element. The transmitting element 301 and the receiving element 312 may be formed by forming a conductor in a shape as shown in FIGS. 46A and 46B. In this case, the three baluns are divided into parts of 350A to 350C in FIG. 46A, but the four supply points and the four output points are positioned at an angle of about 90 ° as in the case of FIGS. 40A and 40B. Is formed.

Next, the positional relationship of the elements in the signal transmission apparatus body will be described. As shown in FIG. 47, in the signal transmission apparatus, the transmission element 301 and the reception element 312 are electromagnetic wave shielded from the outside by the transmitter 300 and the receiver 310 (hereinafter referred to as "casing"). It is. Therefore, the distance d between the transmitting element 301 and the receiving element 312 so that the capacity of the receiving element 312 of the transmitting element 301 becomes larger than that of the transmitting element 301 for the casing 320 and the GND plane. ₁ is arranged to be larger than the distance d ₂ from the casing 320 and the distance d ₃ from the GND surface of the transmission element 301. By arranging in this way, the ratio which propagates from the transmission element 301 to the reception element 312 increases, and the transmission efficiency is improved.

In the third embodiment, the transmitting element and the receiving element need only rotate relatively, except that the rotation axis penetrates both elements as shown in FIG. 48B, and one side is fixed irrespective of the rotation axis as shown in FIG. 48A, and the other rotates. It may be a constitution. Alternatively, as shown in Fig. 48C, the transmitting element and the receiving element may be disposed on the upper and lower surfaces of the cylindrical body. As described above, in the third embodiment, since the transmission signal is equally supplied to the plurality of supply points on the transmission element through balun, the reflection of the signal is suppressed and the propagation intensity of the signal between the transmission and reception elements is equalized. Therefore, stable transmission with little variation in gain in the transmission signal band is possible. In addition, it is possible to prevent signal degradation due to disturbances to the transmission section and unevenness such as the physical shape of elements.

(4) Fourth Embodiment

Next, the signal transmission device of the fourth embodiment will be described. 49 is a block diagram showing signal processing according to the present embodiment. As shown in FIG. 49, two system inspection images captured by the cameras 401a and 401b in the inspection unit are transmitted to the fixing unit 86 through the antenna unit 45, and at the same time the image processing unit in the signal processing unit. The case where the camera synchronization signal generated by 408a and 408b is transmitted from the signal processing unit side to the rotating unit 85 side via the antenna unit 45 is shown. This is described in more detail below. The inspection image signal photographed by the camera 401a is frequency-modulated in the video transmission system 402a using the frequency f ₁ as the carrier frequency, and sent to the mixer 403. On the other hand, the inspection image photographed by the camera 401b is also frequency-modulated in the video transmission system 402b with the frequency f ₂ as the carrier frequency, and sent to the mixer 403. The mixer 403 mixes the two input frequency modulation waves and inputs them to the duplexer 404. The duplexer 404 sends the mixed inspection image signal to the antenna unit 45. The antenna unit 45 transmits the inspection image signal to the fixing unit 86 in a non-contact manner. The transmitted test image signal is sent to the distributor 406 through the duplexer 405. The divider 406 distributes the input inspection image signal to the inspection image signal frequency-modulated at the carrier frequency f ₁ and the inspection image signal frequency-modulated at the carrier frequency f ₂ , and inputs them to the image receiving systems 407a and 407b, respectively. . The image receiving systems 407a and 407b demodulate the inspection image signals, respectively, and send them to the image processing units 408a and 408b. In the image processing units 408a and 408b, predetermined discrimination processing such as scars in the tube and presence or absence of dust is performed in accordance with the input inspection image signal. On the other hand, the image processing units 408a and 408b generate synchronization signals (complex synchronization signals) for synchronization control of the cameras 401a and 401b, respectively. These sync signals are sent to the sync transmitters 409a and 409b, respectively. The synchronization transmitters 409a and 409b frequency modulate the input synchronization signals, respectively, using the frequencies f ₃ and f ₄ as carrier frequencies, and send modulation outputs to the mixer 410. The mixer 410 mixes two frequency-modulated synchronization signals and outputs them to the duplexer 405. The duplexer 405 sends the mixed synchronization signal to the antenna unit 45. The antenna unit 45 transmits the synchronization signal to the rotating unit 85 side without contact. The transmitted synchronization signal is input to the divider 411 through the duplexer 404, and distributed to two system synchronization signals having carrier frequencies f ₃ and f ₄ . The distributed sync signal is input to the sync receivers 412a and 412b, respectively, and is demodulated to become the original composite sync signal. These synchronization signals are supplied to the cameras 401a and 401b, respectively, so that the cameras 401a and 401b shoot an inspection image.

Here, the duplexer 404 passes the image signal with the characteristic C ₁ of FIG. 50 with respect to the inspection image signal supplied from the mixer 403, and with respect to the synchronization signal input from the antenna section 45 of FIG. this is passed through a synchronous signal with characteristics shown in C _2. Therefore, the inspection image signal input from the mixer 403 is not mixed with the synchronization signal to the distributor 411 side, and the synchronization signal supplied from the antenna unit 45 is not input to the mixer 403. In addition, as in the duplexer 405 is transmitted to the characteristic the splitter 406 to the test image signals C ₁ and C ₂ of the characteristic sends only the synchronization signal from the mixer 410 to the antenna unit 45. By the operation of the duplexer, bidirectional transmission of the inspection image signal and the synchronization signal is possible. As the antenna unit 45, various types of signal transmission devices are used. For example, the spiral element type transmission device shown in FIG. 36A and the ring element type transmission device shown in FIG. 36B are used.

Next, the details of the signal processing in the inspection section and the signal processing section will be described with reference to FIG. The inspection images of the CCD cameras 401a to 401l for capturing the inside of the tube are input to four DIO selectors 430a to 430d for each of three systems. Each video selector selects one inspection image from the input three system inspection images by time division and outputs it to the image transmission systems 402a to 402d. Since each video transmitter performs the same operation with the same configuration, the following description will be made only with respect to the video transmitter 402a. The inspection image output from the video selector 430a is amplified to a predetermined level by the amplifier 421a and then input to the VCO 422a. The amplified test image signal is input as a control voltage of the oscillation frequency of the VCO 422a. That is, by frequency-modulating the reference oscillation frequency f ₁ of the VCO 422a with the image inspection signal, the output of the VCO 422a becomes the frequency modulation signal of the inspection image signal with the frequency f ₁ as the carrier frequency. The frequency-modulated test image signal is amplified to a predetermined level by the buffer amplifier 423a and the RF amplifier 424a and input to the BPF 425a. The BPF 425a extracts a frequency-modulated test image signal centering on a carrier frequency (in this case, f ₁ ) in the above-described frequency modulation. The BPF 425a serves to remove harmonic components contained in the frequency-modulated inspection image signal. The output of the BPF 425a is input to the mixer 403. Similarly, in the video transmission systems 402b to 402d, the frequency-modulated inspection image signal is frequency modulated using the frequencies f _{2 to} f ₄ , respectively, and the harmonic components are removed, and then input to the mixer 403. The mixed signal at mixer 402 is directed to splitter 406 through duplexer 404, antenna portion 45 and duplexer 405. The distributor 406 distributes the four system FM inspection image signals mixed by the mixer 403 and inputs them to the respective image receivers 407a to 407d. Here, since each of the video receiving systems 407a to 407d performs the same operation with the same configuration, the following description will be described on behalf of them to describe the video receiving system 407a. From the FM inspection image signal output from the distributor 406, the carrier frequency (in this case f ₁ ) portion in frequency modulation is extracted by the BPF 431a. The output of the BPF 431a is amplified to a predetermined level by the RF amplifier 432 and input to the mixer 433a. On the other hand, the output of the local oscillator 439a is input to the mixer 433a through the BPF 438a, and frequency mixing is performed. The output of the mixer 433a is input to the FM detection circuit 436a through the BPF 434a and the IF amplifier 435a and detected. The inspection image signal detected by the FM detection circuit 436a is amplified by the video amplifier 437a, and then input to the image processing apparatus 408a as an inspection image signal for image analysis. Similarly, the same processing is performed in the image receiving systems 407b to 407d, respectively, and the inspection image signals are supplied to the image processing apparatuses 408a and 408b. The image processing apparatuses 408a and 408b discriminate dust, scars and the like in the tube and output the discrimination result signals through the output amplifiers 450a and 450b. On the other hand, the image processing apparatus 408a, 408b produces | generates the synchronous signal which synchronizes each CCD camera 401 in an inspection part, and inputs it to the synchronous transmission system 409a, 409b. The sync transmitters 409a and 409b have the same configuration as the video transmitters 402a and 402b described above, and frequency modulate the sync signal at each carrier frequency (for example, f ₅ and f ₆ ), and the mixer 410. Output to This FM synchronization signal is transmitted to the inspection unit side through the antenna unit 45 and is sent to the synchronization receiving systems 412a and 412b through the distributor 411. Each of the synchronization receivers 412a and 412b has the same configuration as the video receivers 407a to 407d described above, and demodulates the synchronization signal by the same operation. The demodulated synchronizing signal is waveform-formed by the waveform shaping circuits 440a and 440b, separated into horizontal and vertical synchronizing signals by the synchronizing separation circuits 441a and 441b, and then input to each CCD camera through the driver 442. . In this way, each CCD camera is synchronously controlled by a synchronization signal generated by the image processing apparatus on the signal processing side.

Next, a modification of the fourth embodiment will be described. 52 is a block diagram showing a configuration of a modification of the fourth embodiment in which the concepts of the third embodiment and the fourth embodiment are combined. In this modification, the pair of duplexers D ₁ and D ₂ are arranged in the antenna section 45 shown in FIG. 41, so that bidirectional transmission can be realized. In this modification, the synchronization signal is transmitted from the signal processing section to the inspection section via the antenna section shown in FIG.

1 is a perspective view of a rotary tube inspector of the present invention.

2 is a side view of the rotary tube inspector of FIG.

3 is an explanatory view of the laminate tube of the tube inspector of FIGS.

4A to 4D are cross-sectional views of the insertion portion of the rotary tube inspector.

5A to 5D are explanatory views of a method for inspecting a laminated tube of a rotary tube inspector.

6 is a block diagram illustrating the processing of a signal of a rotary tube inspector.

7 is a side view of the signal transmission apparatus of the first embodiment of the present invention.

8 is a plan view of the interior of the transmitter of the apparatus of FIG.

9 is a plan view of the interior of the receiver of the device of FIG.

10A and 10B are plan views of transmission and reception elements used in the apparatus of FIG.

11 is an explanatory diagram of traveling waves on a transmitting element.

12A and 12B are explanatory diagrams of traveling waves on a transmission element.

13 is a plan view showing the shape of a transmitting element.

14 is a diagram showing the influence of traveling waves of a transmitting element.

15 is a waveform diagram showing traveling waves present in all transmission elements.

Fig. 16 is a diagram showing the relative positional relationship between a transmitting element and a receiving element.

17 is a cross-sectional view showing the configuration of the transmission and reception elements.

18A and 18B are diagrams of examples of other transmission elements.

19A and 19B are diagrams of examples of other transmission elements.

20 is a diagram of an example of another transmitting element.

21A and 21B are plan views of examples of other transmission elements.

22A and 22B are plan views of examples of other transmission elements.

23A and 23B are plan views of examples of other transmission elements.

24A to 24C are diagrams of examples of transmission elements.

25A and 25B are plan views of examples of other transmission elements.

26A to 26B are plan views of examples of other receiving elements.

27A to 27C are plan views of examples of other receiving elements.

28A and 28B are plan views of examples of other receiving elements.

29 is a perspective view of a signal transmission device of a second embodiment of the present invention.

30 is a view showing a transmitter of FIG. 29;

FIG. 31 is a view showing a receiver of FIG. 29; FIG.

32 is a sectional view of a signal transmission device of a second embodiment.

33A and 33B show the structure of transmission and reception elements.

34 is a perspective view of a modification of the signal transmission device of the second embodiment;

35 is a sectional view of the signal transmission device of FIG.

36A and 36B are perspective views of a signal transmission apparatus of another modification of the second embodiment.

37 is a sectional view of the signal transmission device of FIGS. 36A and 36B.

38 is a side view of the signal transmission apparatus of the third embodiment of the present invention.

39A and 39B are plan views showing the structure of the signal transmission device of FIG.

40A and 40B are a transmission and reception element and a plan view of the signal transmission device of FIG.

Fig. 41 is a diagram showing the configuration of the signal transmission apparatus of the third embodiment.

42 is a circuit diagram showing the construction of the signal transmission apparatus of the third embodiment.

43 shows signal transmission characteristics of the signal transmission apparatus of the third embodiment;

44A and 44B show a ring element type signal transmission device and its transmission characteristics.

45A and 45B show a spiral element type signal transmission device and its transmission characteristics.

46A and 46B are plan views of transmission and reception elements according to the third embodiment.

Fig. 47 is a diagram showing the positional relationship between transmission / reception elements and the main body of the apparatus.

48A to 48C are perspective views showing aspects of the signal transmission device of the third embodiment.

Fig. 49 is a block diagram showing the construction of the signal transmission apparatus of the fourth embodiment of the present invention.

50 is a view showing a transfer characteristic of a duplexer.

Fig. 51 is a block diagram showing the detailed configuration of the signal transmission apparatus of the fourth embodiment.

52 is a view showing a modification of the fourth embodiment.

Claims (15)

a) a first body formed of an electromagnetic shielding material, wherein the first body is fixed to a rotating shaft therethrough and rotates with the rotating shaft about an axial direction of the rotating shaft; b) a second body formed of an electromagnetic shielding material and fixedly installed around the rotating shaft; c) a first conductive element spirally formed on the first substrate and disposed in the first body, wherein the first conductive element has its own emission point at each peak of the traveling wave component of the transmission signal generated therefrom; Formed in such a way that they are offset from each other between at least their adjacent turns in the direction; And d) a second conductive element formed on a second substrate, said second conductive element having a first width sufficient to cover said spirally formed first conductive element and a second width in a direction perpendicular to said radial direction, wherein 2 conductive elements are disposed in the second body- Signal transmission device comprising a. The method of claim 1, One of the first body and the second body consists of at least one annular groove, and when the first body and the second body are joined to each other, the annular groove forms a ring-shaped hollow chamber, and the first And a first element and a second element facing each other in the hollow chamber. The method of claim 1, And the second element is spirally formed on the second substrate. The method of claim 1, And a third ring-shaped conductive element formed on the third substrate disposed on the first main body, and a fourth ring-shaped conductive element formed on the fourth substrate disposed on the second main body. The third element and the fourth element are opposed to each other when the first body and the second body are coupled to each other Signal transmission device. The method of claim 4, wherein One of the first body and the second body consists of at least two annular grooves, and when the first body and the second body are joined to each other, the annular grooves form a ring-shaped hollow chamber, the first element and the second element Are opposed to each other in one of the hollow chambers, and the third and fourth elements face each other in the other of the hollow chambers. Signal transmission device. a) a first body formed of an electromagnetic shielding material, wherein the first body is fixed to a rotating shaft therethrough and rotates with the rotating shaft about an axial direction of the rotating shaft; b) a second body formed of an electromagnetic shielding material and fixedly installed around the rotating shaft; c) a first conductive element formed concentrically on the first substrate and disposed within the first body, wherein the first conductive element has at least each peak point of the traveling wave component of the transmission signal generated therefrom in its radial direction; Formed in such a way that they are offset from each other between their adjacent windings; And d) a second conductive element formed on a second substrate, the second conductive element having a first width sufficient to cover the first conductive element formed in the concentric shape in a radial direction and a second width in a direction perpendicular to the radial direction, wherein A second conductive element is disposed in the second body- Signal transmission device comprising a. The method of claim 6, One of the first body and the second body is composed of at least one annular groove, and when the first body and the second body are joined to each other, the annular groove forms a ring-shaped hollow chamber, the first element and the first And 2 elements are opposed to each other in the hollow chamber. The method of claim 6, And the second element is spirally formed on the second substrate. The method of claim 6, And a third ring-shaped conductive element formed on the third substrate disposed on the first main body, and a fourth ring-shaped conductive element formed on the fourth substrate disposed on the second main body. The third element and the fourth element are opposed to each other when the first body and the second body are coupled to each other Signal transmission device. The method of claim 9, One of the first body and the second body consists of at least two annular grooves, and when the first body and the second body are joined to each other, the annular grooves form a ring-shaped hollow chamber, wherein the first element and The second element faces each other in one of the hollow chambers, and the third element and fourth elements face each other in the other of the hollow chambers. Signal transmission device. a) a first body formed of an electromagnetic shielding material, wherein the first body is fixed to a rotating shaft therethrough and rotates with the rotating shaft about an axial direction of the rotating shaft; b) a second body formed of an electromagnetic shielding material and fixedly installed around the rotating shaft; c) a first conductive element disposed in the first body; d) a second conductive element disposed in the second body; e) a first balanced unbalance transformer which converts the impedance of the signal to be transmitted and sends the converted signal to a plurality of signal supply points of one of the first and second conductive elements; And and f) a second balanced unbalance transformer for receiving signals from the plurality of signal output points of the second element and converting the impedance of the received signal to produce a signal. The method of claim 11, And a signal output point different from the number of signal supply points. The method of claim 11, One of the first body and the second body consists of at least one annular groove, and when the first body and the second body are joined to each other, the annular groove forms a ring-shaped hollow chamber, and the first element and And the second element faces each other in the hollow chamber. a) a first body formed of an electromagnetic shielding material, wherein the first body is fixed to a rotating shaft therethrough and rotates with the rotating shaft about an axial direction of the rotating shaft; b) a second body formed of an electromagnetic shielding material and fixedly installed around the rotating shaft; c) a first conductive element disposed in the first body; d) a second conductive element disposed in the second body; e) a first duplexer that passes a signal within a first predetermined frequency band and sends the passed signal to the first conductive element; And f) a second duplexer that receives a signal from the second element and passes the signal within a second frequency band Signal transmission device comprising a. The method of claim 14, One of the first body and the second body consists of at least one annular groove, and when the first body and the second body are joined to each other, the annular groove forms a ring-shaped hollow chamber, and the first element and And the second element faces each other in the hollow chamber.