JP2001044715A - Signal transmission board and signal transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal transmitter to be used in a wide frequency band and a relaxed directivity even in the case of employing a signal transmission board that is generally called as microstrip antenna. SOLUTION: Signal transmission boards 13, 14 are formed by providing a signal transmission pattern 61 and a ground pattern 62 that are double-ring- shaped onto a ring form printed circuit board 60, and a feeding point 63 is provided at a plurality of positions of the signal transmission pattern 61 and the ground pattern 62. Then feeders 65 of a coaxial cable 64 are connected to the feeding points 63. Units above are opposed to each other so that the signal transmission boards 13, 14 have a prescribed interval.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a signal transmission device for transmitting a signal in a non-contact manner and a signal transmission board used for the signal transmission device.

[0002]

2. Description of the Related Art Conventionally, as an apparatus for transmitting a control signal or an output signal of a sensor, a microstrip line used as a transmission line of a high-frequency signal on a printed circuit board of a high-frequency circuit or the like is configured as an antenna.
Devices using this microstrip antenna as a non-contact transmission line for high-frequency signals have been put to practical use. According to this device, a large amount of information can be transmitted at high speed by using a high-frequency signal.

[0003]

However, according to the above-mentioned conventional apparatus, the usable frequency band is narrow, and it cannot be used for signal transmission of a system for switching a plurality of carrier frequencies.

[0004] The conventional device has a strong directivity,
There was a problem that a certain amount of time was required for adjustment.

Therefore, the present invention solves the above problems,
Even when a signal transmission board generally called a microstrip antenna is used, the usable frequency band is wide,
It is another object of the present invention to provide a signal transmission device with reduced directivity and a signal transmission board used for the device.

[0006]

According to a first aspect of the present invention, there is provided a signal transmission board comprising a microstrip antenna type signal transmission board having a ground pattern and a signal transmission pattern formed on a printed board. The signal transmission pattern is characterized in that at least an outer peripheral edge is formed in a circular shape, and power supply points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern.

According to the signal transmission board of the first aspect, at least the outer peripheral edge of the signal transmission pattern on the microstrip antenna type signal transmission board is formed in a circular shape. , And by aligning the center positions of the respective signal transmission patterns, even when the signal transmission boards are rotated, the signal patterns are always accurately opposed to each other, and efficient signal transmission is performed. . In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy.

According to a second aspect of the present invention, there is provided a signal transmission board according to the first aspect, wherein the signal transmission pattern is a disk-shaped pattern. And

According to the second aspect of the present invention, since the signal transmission pattern is formed in a disk shape, the area of the signal transmission pattern can be made larger than that of a linear microstrip antenna. The frequency band of signals that can be transmitted is widened. In addition, by providing such a pair of signal transmission boards and aligning the center positions of the respective circular signal transmission patterns, even when the signal transmission boards are rotated, the signal patterns always accurately face each other. As a result, efficient signal transmission is performed.
In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy.

According to a third aspect of the present invention, there is provided a signal transmission board according to the first aspect, wherein the signal transmission pattern is a ring-shaped pattern. I do.

According to the third aspect of the present invention, since the signal transmission pattern is formed in a ring shape, the area of the signal transmission pattern can be made larger than that of a linear microstrip antenna. The frequency band of possible signals is expanded. In addition, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, even when the signal transmission boards are rotated, the signal patterns always face each other accurately. As a result, efficient signal transmission is performed. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy.

According to a fourth aspect of the present invention, there is provided a signal transmission board according to any one of the first to third aspects, wherein the ground pattern is formed on a rear surface of the printed board. And the signal transmission pattern is formed in the predetermined shape on the surface of the printed circuit board.

According to the fourth aspect of the present invention, the ground pattern is formed uniformly on the back surface of the printed circuit board, and the signal transmission pattern is formed in the predetermined shape on the front surface of the printed circuit board. Although the magnetic flux from the transmission pattern wraps around the back side of the printed circuit board, the directivity in a single direction is weakened by the plurality of feeding points, and the magnetic flux is uniformly generated in each direction. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, signals can be transmitted satisfactorily even when the signal transmission boards are rotated.

According to a fifth aspect of the present invention, there is provided a signal transmission board according to any one of the first to third aspects, wherein the signal transmission pattern is formed in a central portion of the front surface of the printed board. Wherein the ground pattern is formed around the surface of the printed circuit board with a predetermined gap from the signal transmission pattern.

According to the fifth aspect of the present invention, the signal transmission pattern is formed in the predetermined shape at the center of the surface of the printed circuit board, and the ground pattern is formed with the signal transmission pattern at the periphery of the surface of the printed circuit board. Since it is formed with a predetermined gap, the magnetic flux from the signal transmission pattern does not wrap around to the back side of the printed circuit board. Moreover,
Due to the plurality of feeding points, directivity in a single direction is weakened and the power is generated uniformly in each direction. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, signals can be transmitted efficiently even when the signal transmission boards are rotated.

According to a sixth aspect of the present invention, there is provided a signal transmission board according to the fifth aspect, wherein the signal transmission pattern and the ground pattern are both ring-shaped on the surface of the printed board. It is a double ring-shaped pattern formed in a shape.

According to the signal transmission board of the sixth aspect, the signal transmission pattern and the ground pattern are formed as double ring-shaped patterns on the surface of the printed circuit board, so that the signal transmission pattern and the ground pattern are generally used as transmission paths for high frequency signals. A structure can be realized in which a coaxial cable is cut into a circle. Further, by providing a pair of such signal transmission boards and opposing each other, the ground patterns facing each other and the signal transmission patterns can be capacitively coupled via the air layer, so that the signal transmission within the coaxial cable is performed. A signal transmission path equivalent to a path that is capacitively coupled can be realized. As a result, signal transmission in a wide band such as a coaxial cable is performed instead of signal transmission in a specific band using an antenna.

According to a seventh aspect of the present invention, there is provided a signal transmission board according to any one of the first to sixth aspects, wherein a feeding point is provided between the signal transmission pattern and the ground pattern. It is characterized in that it is provided at each of a plurality of locations.

According to the signal transmission board of the present invention, since the power supply points are provided at a plurality of positions of the signal transmission pattern and the grounding pattern, the directivity can be further enhanced in a single direction. Is prevented.

In order to solve the above-mentioned problems, a signal transmission device according to an eighth aspect of the present invention includes a pair of microstrip antenna-type signal transmission substrates each having a ground pattern and a signal transmission pattern formed on a printed circuit board. Wherein the signal transmission patterns on the respective signal transmission boards are formed so that at least the outer peripheral edges are formed in a circular shape, and the pair of signal transmission substrates have the at least outer peripheral edges having a circular shape. The signal transmission patterns of the shape are arranged rotatably with each other so that the centers of the signal transmission patterns coincide with each other on the rotation center axis, and feeding points for the signal transmission patterns are provided at a plurality of locations on the signal transmission patterns. Assuming that the number of feeding points on the signal transmission board is N, the number of feeding points on the other signal transmission board is set to N-1. And it features.

According to the signal transmission device of the eighth aspect, the pair of signal transmission substrates of the microstrip antenna type comprises:
Since at least the outer peripheral edges are rotatably arranged so that the centers of the circular signal transmission patterns coincide with each other on the rotation center axis, the signal transmission patterns always accurately face each other even during rotation. Thus, efficient signal transmission is performed. The characteristic impedance of the signal transmission board is determined by the width of the signal transmission pattern, the distance between the signal transmission pattern and the ground pattern, and the like. Therefore, by using signal transmission boards that are arranged opposite to each other and having the same pattern width, spacing, etc., the signal transmission pattern of one signal transmission board is changed from the signal transmission pattern of the other signal transmission board in a state of impedance matching. To signal transmission pattern,
Signal transmission will be performed. Further, the signal transmission path composed of the signal transmission pattern of the one signal transmission board and the signal transmission pattern of the other signal transmission board are disposed facing each other at a predetermined interval, and are capacitively coupled via an air layer. Will be. The capacitance is determined by the relative permittivity of the signal transmission board, the interval between the signal transmission boards facing each other, and the width and length of the signal transmission pattern. Therefore, a signal of a desired frequency can be transmitted by setting this capacity to a predetermined value. Further, since a plurality of feeding points are provided on the ground pattern and the signal transmission pattern, it is possible to prevent a single directivity at the time of signal transmission, and to provide a signal between the stationary side and the rotating side. In this case, power transmission and signal transmission are performed stably.
Further, when N feeding points are provided on the signal transmission board, N-1 feeding points are provided on the other signal transmission board facing the signal transmission board. Therefore, even when these signal transmission boards are relatively rotated, the feeding points of the opposing signal transmission boards do not overlap at all points regardless of the rotating state of each other. As a result, a dip point at which the level on the signal transmission characteristic locally drops is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to a ninth aspect of the present invention, in order to solve the above-mentioned problem, in the signal transmission apparatus according to the eighth aspect, the signal transmission pattern is a disk-shaped pattern. And

According to the signal transmission device of the ninth aspect, since the signal transmission pattern is formed in a disk shape, the area of the signal transmission pattern can be made larger than that of a linear microstrip antenna. The frequency band of signals that can be transmitted is widened. In addition, by aligning the center positions of the circular signal transmission patterns on the signal transmission boards with each other, even when the signal transmission boards are rotated, the signal patterns are always accurately opposed to each other, and efficient signal transmission is achieved. Will be done. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to a tenth aspect of the present invention, in order to solve the above problem, in the signal transmitting apparatus according to the eighth aspect, the signal transmission pattern is a pattern formed in a ring shape. I do.

According to the signal transmission device of the tenth aspect,
Since the signal transmission pattern is formed in a ring shape, the length of the signal transmission pattern can be made longer than that of a linear microstrip antenna, and the frequency band of signals that can be transmitted is widened. In addition, by aligning the center positions of the circular signal transmission patterns on the signal transmission boards with each other, even when the signal transmission boards are rotated, the signal patterns are always accurately opposed to each other, and efficient signal transmission is achieved. Will be done. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

[0026] In order to solve the above-mentioned problem, the signal transmission device according to the eleventh aspect is characterized by any one of the eighth to tenth aspects.
The signal transmission device according to claim 1, wherein the ground pattern is formed uniformly on a back surface of the printed circuit board, and the signal transmission pattern is formed in the predetermined shape on a surface of the printed circuit board. And

According to the signal transmission device of the eleventh aspect,
The ground pattern is formed uniformly on the back surface of the printed circuit board, and the signal transmission pattern is formed in the predetermined shape on the front surface of the printed circuit board. Due to the plurality of feeding points, directivity in a single direction is weakened and the power is generated uniformly in each direction. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, signals can be transmitted satisfactorily even when the signal transmission boards are rotated. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to a twelfth aspect of the present invention, there is provided a signal transmission apparatus according to any one of the eighth to tenth aspects, in order to solve the above problem.
In the signal transmission device according to the aspect, the signal transmission pattern is formed in the predetermined shape at a central portion of the surface of the printed circuit board, and the ground pattern is formed with the signal transmission pattern at a peripheral portion of the surface of the printed circuit board. It is characterized by being formed with a predetermined gap.

According to the signal transmission device of the twelfth aspect,
The signal transmission pattern was formed in the predetermined shape at the center of the surface of the printed circuit board, and the ground pattern was formed with a predetermined gap from the signal transmission pattern at the periphery of the surface of the printed circuit board. Of the magnetic flux to the back side of the printed circuit board is eliminated. Moreover, the directivity in a single direction is weakened by the plurality of feeding points, and the power is uniformly generated in each direction. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, signals can be transmitted efficiently even when the signal transmission boards are rotated. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to a thirteenth aspect of the present invention, in order to solve the above problem, in the signal transmission device according to the twelfth aspect, the signal transmission pattern and the grounding pattern are:
It is a double ring-shaped pattern formed in a ring shape on the surface of the printed circuit board.

According to the signal transmission device of the thirteenth aspect,
Since the signal transmission pattern and the ground pattern are formed as a double ring pattern on the surface of the printed circuit board, a structure in which a coaxial cable generally used as a transmission path for a high-frequency signal is cut into a ring can be realized. Further, by providing a pair of such signal transmission boards and opposing each other, the ground patterns facing each other and the signal transmission patterns can be capacitively coupled via the air layer, so that the signal transmission within the coaxial cable is performed. A signal transmission path equivalent to a path that is capacitively coupled can be realized. As a result, signal transmission in a wide band such as a coaxial cable is performed instead of signal transmission in a specific band using an antenna. In particular, the characteristic impedance of the signal transmission board on which the ground pattern and the signal transmission pattern are formed is determined by the pattern width of the signal transmission pattern, the distance between the signal transmission pattern and the ground pattern, and the like. Therefore, by using signal transmission boards that are arranged opposite to each other and having the same pattern width, spacing, etc., the signal transmission pattern of one signal transmission board is changed from the signal transmission pattern of the other signal transmission board in a state of impedance matching. The signal is transmitted to the signal transmission pattern. Further, the signal transmission path composed of the signal transmission pattern of the one signal transmission board and the signal transmission pattern of the other signal transmission board are disposed facing each other at a predetermined interval, and are capacitively coupled via an air layer. Will be. This capacitance is determined by the relative permittivity of the signal transmission board, the distance between the signal transmission boards facing each other,
And the width and length of the signal transmission pattern.
Therefore, a signal of a desired frequency can be transmitted by setting this capacity to a predetermined value. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to a fourteenth aspect of the present invention, there is provided a signal transmission device according to any one of the eighth to thirteenth aspects, in order to solve the above problem.
In the above-described signal transmission device, the power supply points are provided at a plurality of positions of the signal transmission pattern and the ground pattern, respectively.

According to the signal transmission board of claim 14,
Since the power supply points are provided at a plurality of locations of the signal transmission pattern and the ground pattern, the directivity is more reliably prevented from increasing in a single direction. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

[0034]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. 1 to 15 of the accompanying drawings. FIG. 1 is a perspective view of the signal transmission device 100. As shown, the signal transmission device 100 includes a first housing 10.
The second housing 103 and the second housing 103 are integrally connected to each other so as to be rotatable in a vertical direction.

The first housing 102 is made of, for example, Al (aluminum), and has a housing 107 as shown by a dotted line in FIG. The first signal transmission board 13 is stored in the storage section 107. The first housing 102 has a shaft 104.

On the other hand, the second housing 103 is made of, for example, Al (aluminum) like the first housing 102, and is provided with a storage portion 109 as shown by a dotted line in FIG. The second signal transmission board 14 is stored in the storage section 109. The second housing 103 is provided with a through hole 5, and the shaft portion 104 of the first housing 102 is rotatably supported by the through hole 105 via a bearing 106.

In this embodiment, the first housing 1
02 accommodates the first signal transmission board 13, further accommodates the second signal transmission board 14 in the second housing 103, and fixes the shaft 104 of the first housing 102 to the second
The first signal transmission board 13 and the second signal transmission board 13 are inserted through the through hole 105 of the housing 103 and the first housing 102 and the second housing 103 are assembled as shown in FIG.
It is configured such that a gap of 0.5 to 1 mm is provided between itself and the signal transmission board 14.

The first signal transmission board 13 and the second signal transmission board 14 are sealed by a first housing 102 and a second housing 103 and are electromagnetically shielded. Therefore, the transmission / reception unit is not affected by external noise and does not become a noise source to the outside.

As shown in FIGS. 3 and 4, the first signal transmission board 13 and the second signal transmission board 14 are formed on a ring-shaped printed circuit board 60 by forming a signal transmission pattern 61 and a ground pattern 62 on a double ring. It is formed in a shape.

The printed board 60 is formed by forming a board made of glass epoxy into a ring shape.
The shape and size of 0 are the same in both the first signal transmission board 13 and the second signal transmission board 14.

Signal transmission pattern 61 and ground pattern 62
Is a pattern formed of a metal having a low resistivity, and is provided on one surface of the printed circuit board 60. Examples of usable metals include silver, which is expensive. Further, copper and aluminum have low resistivity and are inexpensive, so that they are suitable as metals used for such patterns. In the present embodiment, as an example, a pattern formed of a copper foil is used.

Signal transmission pattern 61 and ground pattern 62
Is a ring shape, and a feeding point 63 is provided at a plurality of locations of each ring shape pattern.
As shown in FIG. 5, each feed point 63 has a coaxial cable 6
4 is connected to the feeder line 65 taken out. In the present embodiment, the first signal transmission board 13 is a transmission-side board, and each power supply point 63 on the signal transmission pattern 61 of the first signal transmission board 13 on the transmission side is provided with a power supply line 6.
5 so that signals of a predetermined frequency are simultaneously supplied. The lengths of the power supply lines 65 are equal, and the phases of the signals supplied to the power supply points 63 are aligned. Further, the first transmission board 13 and the second transmission board 14 are opposed to each other at an interval of 0.5 to 1.0 mm as described above, and the signal transmission patterns 61 and the ground pattern 62 are provided.
The components are capacitively coupled to each other via an air layer.

As described above, the signal transmission device 100 of the present embodiment is equivalent to a device in which a coaxial cable is cut in a vertical section perpendicular to the central axis and each is capacitively coupled. Therefore, an electric field generated orthogonal to the signal transmission pattern 61 in the direction of the ground pattern 62 and a magnetic field generated orthogonal to the signal transmission pattern 61 so as to surround the signal transmission pattern 61, that is, the direction orthogonal to both directions, that is, the first direction Signals are transmitted by moving electromagnetic energy in a direction from the transmission board 13 to the second transmission board 14. That is, in the present embodiment, signal transmission is performed by a method equivalent to that of a coaxial cable, not by signal transmission by an antenna pair, but by a double ring-shaped structure of patterns, simultaneous power supply at multiple points, and capacitive coupling.

In the present embodiment, the frequency of the signal to be transmitted is a high frequency equal to or higher than the VHF band. In such a case, the signal is transmitted on the surface of the center conductor of the coaxial cable due to the surface effect. On the other hand, the characteristic impedance of the signal transmission board of the present embodiment, which is equivalent to a coaxial cable cut in a vertical section perpendicular to the central axis, is
As shown in FIG. 3 and FIG.
2 and the outside of the ring-shaped signal transmission pattern 61 are determined by the gap W3. Therefore, by using a signal transmission board having the same interval W3 on the transmission side and the reception side, it is possible to transmit a signal in a state where the impedance on the transmission side and the impedance on the reception side are matched, and to generate a standing wave. Broadband signal transmission can be performed with practically no problem.

Further, the capacitance value x [pF] in the capacitive coupling
Is the distance between the first signal transmission board 13 and the second signal transmission board 14 as G [mm], and the area of the signal transmission pattern 61 or the ground pattern 62 as a [(width [mm] × length [mm] / 1000). ], Assuming that the relative permittivity of the printed circuit board 60 is y,

[0047]

X = (y × 8.854 × a) / G Therefore, it is possible to transmit a signal in a desired band by determining values such as the interval G and the width and length of each pattern so that the capacitance value x becomes an appropriate value.

In this embodiment, the width, the total length, and the width of each of the signal transmission pattern 61 and the ground pattern 62 are set.
The distance W between the signal transmission pattern 61 and the ground pattern 62 is determined by the first signal transmission board 13 and the second signal transmission board 14.
Are set to the same value.

Further, the number of the feeding points 63 is configured to be N-1 on the pattern of the first signal transmission board 13 and N-1 on the pattern of the second signal transmission board 14. In the present embodiment, as an example, four feeding points 63 on the pattern of the first signal transmission board 13 and three feeding points 63 on the pattern of the second signal transmission board 14.
Is provided. With this configuration, as in the present embodiment, the first signal transmission board 13 and the second signal transmission board 1
4 does not rotate relative to each other, the first signal transmission board 13 and the second signal transmission board 14 do not have a positional relationship in which all feeding points 63 face each other at the same time.
A substantially flat signal transmission characteristic can be obtained in a wide band.

Hereinafter, the signal transmission unit of this embodiment will be described.
An experimental result of examining signal transmission characteristics will be described. In this experiment, as shown in FIG. 6, one of the plurality of feeding points 63 was used on each of the stationary side and the rotating side.
And the feeding point 63 on the rotating side is 0% with respect to the feeding point 63 on the stationary side.
In this figure, the loss of a signal at angles of ゜, 90 °, 180 °, and 270 ° was examined. The measurement was performed using a spectrum analyzer manufactured by Advantest Corporation, and the frequency of the signal was changed from 300 MHz to 550 MHz. The results of the experiment are shown in FIGS.

7 shows a case where the angle of the feeding point 63 on the rotating side is 0 ° with respect to the feeding point 63 on the stationary side, FIG. 8 shows 90 °, FIG. 9 shows 180 °, and FIG. The results are shown. As can be seen from the results of FIGS. 7 to 10, according to the present embodiment, a substantially flat characteristic was obtained over a wide band from 300 MHz to 550 MHz. As an example, 49
Looking at the results at 0 MHz, at any angle, -8
The loss was about dBm. On the other hand, when measurement was performed under the same conditions using a coaxial cable, as shown in FIG. 11, the loss was about -2 dBm over a wide band from 300 MHz to 550 MHz.

Here, for comparison, the feeding point 63 is set to the first
FIGS. 12 and 13 show the results of measuring one signal on each of the signal transmission board 13 and the second signal transmission board 14. FIG. 12 shows that the angle between the feeding point 63 on the stationary side and the rotating side is 0.
For ゜, FIG. 13 shows the result for 180 °.

When there is one feed point and the position of the feed point coincides between the stationary side and the rotating side, as can be seen from FIG. 12, the frequency is extremely large at the natural frequency f and its multiple frequency 2f. A dip point occurs. In addition, as can be seen from FIGS. 12 and 13, the signal loss is large on average.

As described above, when there is one feeding point,
It shows the same characteristics as a loop antenna, cannot obtain flat characteristics over a wide band, and superimposes a frequency-modulated signal on a carrier frequency as in the present embodiment.
It is not suitable for a configuration for transmitting from the rotating side to the stationary side.

On the other hand, when a plurality of feeding points are provided, even if the position of one feeding point on the stationary side coincides with the position of one feeding point on the rotating side, the positions of the other feeding points are different. Since they do not match, it is considered that they were averaged as a whole and flat characteristics as shown in FIGS. 7 to 10 were obtained. Such characteristics are suitable for a configuration in which a frequency-modulated signal is superimposed on a carrier frequency and transmitted from a rotating side to a stationary side as in the present embodiment.

An advantage of providing a plurality of feeding points is that the directivity can be improved. 14 and 15 show the results of examining the relationship between the feeding point and the directivity using a disk-shaped microslip antenna. First, as shown in FIG. 14A, a disk-shaped signal transmission pattern 61 'is formed on the front surface of a printed circuit board 60', and a ground pattern 62 'is formed on the back surface, as shown in FIG. 14B. Four feeding points A,
B, C, and D are provided, and as shown in FIGS. 14C and 14D, the directivity pattern of the radio wave when the diameter of the disc-shaped signal transmission pattern 61 ′ is λ / 2 is shown in FIG. ). As can be seen from FIG. 14E, a pattern such as a substantially non-directional pattern can be realized by providing a plurality of power supply points.

On the other hand, as shown in FIG. 15, a disc-shaped signal transmission pattern 61 'is formed on the front surface of the printed circuit board 60', and a ground pattern 62 'is formed on the back surface.
As shown in FIG. 15B, one feeding point A is provided on the disc-shaped signal transmission pattern 61 ′, and as shown in FIG. 15C, the diameter of the disc-shaped signal transmission pattern 61 ′ is λ / 2. FIG. 15D shows the directivity pattern of the radio wave in the case of. FIG.
As can be seen from (D), when there is one feeding point, 8
, And is not particularly suitable for a configuration for transmitting a signal from the rotating side to the stationary side as in the present embodiment.

As described above, in the signal transmission section of the present embodiment, the signal transmission pattern of the double ring structure and the ground pattern are capacitively coupled, and one of the signal transmission patterns is N and the other is N-1. Since power is supplied to points, flat characteristics can be obtained in a wide band like a coaxial cable.

In the present embodiment, with the above configuration, it is possible to transmit a signal with flat characteristics over a wide band. In addition, since it can be made to be almost omni-directional, efficient signal transmission can be performed even when used in a rotating system.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The signal transmission board of the present invention is not limited to the example described in the first embodiment.
6 may be used. The signal transmission board shown in FIG. 16 has the same configuration as that shown in FIG. 14A, and has a disc-shaped signal transmission pattern 61 ′ formed on the surface of a square printed board 60 ′. The ground pattern 62 'is formed uniformly on the back surface of the printed circuit board 60'. Even in this case, the signal transmission pattern 61 '
The upper feeding point 63 is provided at a plurality of positions, for example, at four positions. The diameter of the signal transmission pattern 61 ′ is set to λ / 2 in the x direction and the y direction, respectively.

As described above, when the ground pattern 62 'is formed on the entire back surface of the printed circuit board 60', most of the magnetic flux from the signal transmission pattern 61 'goes around to the ground pattern 62' on the back surface. Therefore, the loss is larger than that in the first embodiment. However, substantially omnidirectional characteristics can be realized by the plurality of feeding points 63 as in the first embodiment, and the frequency band can be widened by increasing the area of the signal transmission pattern 61 '. Can be.

In the example shown in FIG. 17, only the signal transmission pattern is a ring-shaped signal transmission pattern 61. Also in this case, when the ground pattern 62 'is formed over the entire back surface of the printed circuit board 60', most of the magnetic flux from the signal transmission pattern 61 'goes around to the ground pattern 62' on the back surface. The loss is larger than in the first embodiment. However, similar to the first embodiment, a substantially omnidirectional characteristic can be realized by the plurality of feeding points 63, and the frequency band is widened by increasing the length of the signal transmission pattern 61 '. be able to.

Further, a configuration as shown in FIG. 18 can be adopted. In the example shown in FIG. 18, the signal transmission pattern 61 has a ring shape, and a ground pattern 62 ″ is provided on the surface of the printed circuit board 60 ′ so as to surround the signal transmission pattern 61. Transmission pattern 6
One power supply point 63 is provided at a plurality of locations, for example, at four locations. With this configuration, the magnetic flux from the signal transmission pattern 61 does not go around the back surface of the printed circuit board 60 ′, so that a loss in signal transmission can be prevented from lowering.

Further, it may be configured as shown in FIG. The example shown in FIG. 19 is similar to the first embodiment,
The signal transmission pattern 61 and the ground pattern 62 are formed in a double ring shape, but the printed circuit board 60 'is different from the first embodiment in that the printed circuit board 60' is formed in a square shape. Thus, the shape of the printed circuit board 60 'does not necessarily need to be a ring shape. According to such a configuration, signal transmission with flat characteristics can be performed over a wide band. Also, almost omnidirectionality can be realized.

Further, the configuration may be as shown in FIG. In the example shown in FIG. 20, the printed board 60, the signal transmission pattern 61, and the ground pattern 62 are all ring-shaped, but the signal transmission pattern 61 is provided on the front side of the printed board 60, and the ground pattern 62 is
Is provided on the back surface. In this case, since most of the magnetic flux from the signal transmission pattern 61 goes around to the ground pattern 62 on the back surface, the loss is larger than in the first embodiment. However, similar to the first embodiment, a substantially non-directional characteristic can be realized by the plurality of feeding points 63.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIGS. 21 to 33 of the accompanying drawings. FIG. 21 is a diagram showing a schematic configuration of an extrusion-type laminating machine using a rotary joint for transmitting measurement signals and power as a third embodiment of the present invention.

As shown in FIG. 21, the extrusion type laminating machine of the present embodiment is provided with a sheet supply section 20 for supplying PET as a base material. The PET 21 supplied from the sheet supply unit 20 includes
Through the laminating section, and is configured to face the T-die 23 in the laminating section. T
The melted polyethylene is supplied to the die 23 from the upper hopper 24, and the polyethylene supplied from the T die 23 is applied on the PET 21. And PE
The polyethylene applied on T21 is immediately cooled by the cooling roll 25 and fixed on PET21. Sheets formed in two layers by such lamination processing are:
The sheet is conveyed to the winding unit 27 via the conveying unit 26, and is wound at the winding unit 27.

In order to carry out good laminating processing in such a laminating machine, it is important to maintain the surface temperature of the cooling roll 25 at a predetermined appropriate temperature. Can be

FIG. 22 is a partially cutaway perspective view showing a schematic configuration of the cooling roll 25 in the present embodiment. As shown in FIG. 22, a plurality of pipes 30 for supplying cooling water are arranged inside the roll.
The middle of the roll surface 31 is provided with a vapor phase of the working liquid, and the temperature of the roll surface end is only 5 to 8 ° C. lower than that of the middle portion. For example, if the surface temperature of the intermediate portion of the roll is 36 ° C, the end portion becomes 29 to 31 ° C. Therefore, by setting this temperature to be equal to or higher than the dew point of the surrounding air, dew condensation by the cooling roll 25 can be completely prevented. In the present embodiment,
The cooling roll 25 has a diameter of 600 mm and a length of 20 mm.
00 mm, and the diameter of a rotating shaft connected to a rotary joint described later was 15 mm. The cooling water temperature was 15 ° C.

Further, since the surface 31 of the cooling roll 25 is not only uniform in temperature but also mirror-finished, the transparency of the sheet to be laminated is made uniform over the entire width.

Then, in the cooling roll 25,
In order to maintain the surface temperature at a predetermined appropriate temperature, FIG.
As shown in (A), the resistance thermometer 11 made of platinum is embedded in the surface layer of the cooling roll 25, and the measurement signal and the measurement signal of the resistance thermometer 11 are transmitted from the rotating side using the rotary joint 1 for power transmission. By transmitting the cooling water to the stationary side and controlling the flow rate of the cooling water based on the measurement signal, the surface temperature is maintained at a desired constant temperature. The cooling water is supplied via a cooling water supply rotary joint 33 shown in FIG. 23A, passes through a hollow shaft provided in the rotary joint 1 for transmitting measurement signals and power, and further passes through a cooling roller 25. The pipe 30 passes through a rotating shaft 32.
Leads to.

Hereinafter, the configuration of the rotary joint 1 for transmitting the measurement signal and the power supply in this embodiment will be described with reference to FIG.
This will be described in detail with reference to FIGS.

[Rotary Joint] FIG. 23A is a plan view showing an entire cooling roll unit to which a rotary joint 1 for transmitting a measurement signal and power and a rotary joint 33 for supplying cooling water according to an embodiment of the present invention. FIG. 23 (B) is a plan view showing a comparative example compared with the cooling roll unit of FIG. 23 (A).
FIG. 24 is a cross-sectional view of a half of the rotary joint 1 for transmitting measurement signals and power supply according to the present embodiment from the rotation center axis, and a plan view of the other half. FIG. 25 is a block diagram showing an electrical connection relationship between each circuit, a signal transmission board, and a power transmission coupler in the rotary joint 1 for transmitting a measurement signal and power according to the present embodiment. The rotation center axis L shown in FIG. 24 matches the rotation center axis L shown in FIGS. 23 (A) and 23 (B).

As shown in FIG. 24, the rotary joint 1 for transmitting measurement signals and power supply according to the present embodiment has a hollow shaft having a shaft end 2a on the side of the cooling roll 25 and a shaft end 2b on the side of the rotary joint 33 for supplying cooling water. 2, rings 3a, 3b fitted around the outer periphery of the hollow shaft 2, and rings 3a, 3b.
3b fitted with a flange 4a and a body 4b
The housing member 4, the bearings 5a and 5b, and the bearing 5
a, 5b, which is supported by the first housing member 4 through the first housing member 4 and has a cylindrical portion 6b, a ring 6a, a flange portion 6b.
The housing member 6, a support plate 15a attached to the body 4b of the first housing member 4, and the support plate 1 attached to the flange 6b of the second housing member 6.
5b, an electric circuit unit 12 supported by the body 4b of the first housing member 4, a first ferrite core coil unit 18 supported by the support plate 15b, and a support plate 15b.
And a second ferrite core coil unit 19 supported by the second ferrite core unit.

The hollow shaft 2 is an iron shaft in which a hollow hole 2c as a cooling water supply passage is formed. The hollow shaft 2 has a maximum thickness of about 30 mm and can withstand a water pressure of about 7 kg / cm ^2. Is configured. The shaft end 2 a of the hollow shaft 2 on the cooling roll 25 side is fitted to the rotating shaft 32 of the cooling roll 25, and is connected to the rotating shaft 32 by a bolt (not shown) inserted into a bolt hole (not shown) provided in the hollow shaft 2. Can be firmly attached. Therefore, when the cooling roll 25 is rotationally driven, the hollow shaft 2 is also rotationally driven.
The cooling water supply rotary joint 33 is attached to the other shaft end 2b by screwing or the like to the shaft end 2b.

Rings 3a, 3b made of stainless steel are provided on the outer periphery of the hollow shaft 2 near the shaft ends 2a, 2b.
Are fitted and attached. And this ring 3a,
When the first housing member 4 is fitted and attached to 3b, an air space 3c is formed between the first housing member 4 and the hollow shaft 2. When the cooling water having the above-described temperature is supplied to the hollow hole 2c of the hollow shaft 2, dew is formed on the outer surface of the hollow shaft 2. The air layer 3c prevents the dew from affecting the electric circuit and the like.

The first housing member 4 is made of anodized aluminum and has a flange 4a and a body 4b. The inner ring of the bearing 5a is fitted into the flange 4a,
Is fitted with the inner race of the bearing 5b.

The second housing member 6 is also made of aluminum, and the surface of the cylindrical wall 6c is anodized. The ring 6a of the second housing member is fitted to the outer ring of the bearing 5a, and the flange 6b of the second housing member 6 is fitted to the outer ring of the bearing 5b. Therefore, when the hollow shaft 2 rotates with the rotation of the cooling roll 25, the first flange member 4 rotates with respect to the second flange member 6.

The electric circuit unit 12 is attached to the body 4b of the first flange member 4 which rotates as described above. The electric circuit unit 12 includes a power supply converter 7, a resistance temperature converter 8, an A / F converter 9 for converting an analog signal into a pulse signal, and an F signal transmitter 10 for modulating and transmitting a pulse signal shown in FIG. The resistance temperature detector 11 attached to the cooling roll 25 is electrically connected to the resistance temperature converter 8 in the electric circuit unit 12 via a cable and a connector (not shown). Further, the resistance temperature converter 8 is electrically connected to an A / F converter 9, and the A / F converter 9 is electrically connected to an F signal transmitter 10. It is electrically connected to the substrate 13.

Returning again to FIG. 24, a hollow disk-shaped stainless steel support plate 15a provided substantially perpendicular to the rotation center axis L is provided on the body 4b of the first flange member 4. The first ferrite core coil unit 18 is supported by the support plate 15a. First
The ferrite core coil unit 18 has a coil in a ferrite core as described later, and this coil is electrically connected to the power converter 7 in the electric circuit unit 12 shown in FIG. An induced electromotive force is generated in the coil of the first ferrite core coil unit 18 by the action of mutual induction as described later, and the induced electromotive force is supplied to the power converter 7. Thereby, stable power is supplied to the resistance temperature converter 8, the A / F converter 9, and the F signal transmitter 10 constituting the electric circuit unit 12. Further, as shown in FIG. 24, a first signal transmission board 13 is attached to the first ferrite core coil unit 18 so as to cover the coil.

On the other hand, a hollow disk-shaped support plate 15b made of stainless steel is also attached to the flange portion 6b of the second housing member 6, and the support plate 15b is
The second ferrite core coil unit 19 is supported. The second ferrite core coil unit 19, like the first ferrite core coil unit 18, has a coil in a ferrite core as described later, and this coil is a stationary power converter as shown in FIG. 42 and is electrically connected. The second ferrite core coil unit 19 has the first ferrite core coil unit 19 so as to cover the coil.
Second signal transmission board 14 having the same configuration as signal transmission board 13
Is attached.

The first ferrite core coil unit 18 and the second ferrite core coil unit 19 described above
Are arranged to face each other with a gap of 0.5 mm to 1 mm. When a current flows through the coil by the power converter 42, a magnetic field is generated in the second ferrite core coil unit 19, and a mutual induction action occurs. As a result, an induced electromotive force is generated in the first ferrite core coil unit 18 described above.

Further, as a result of the first ferrite core coil unit 18 and the second ferrite core coil unit 19 being arranged opposite to each other as described above, the first signal transmission board 13 and the second signal transmission board 14 attached thereto are mounted. Will also be disposed facing each other with the gap,
The signal transmission pattern and the ground pattern formed on the first signal transmission board 13 are capacitively coupled between the signal transmission pattern and the ground pattern on the second signal transmission board 14 via the air layer existing in the gap. The signal is transmitted. That is, the signal output from the rotating F signal transmitter 10 is input to the stationary receiver 40 via the first signal transmission board 13 and the second signal transmission board 14.

As described above, the first ferrite core coil unit 18 and the second ferrite core coil unit 1
Numeral 9 functions as a power transmission coupler unit for transmitting power using electromotive force generated by mutual induction (electromagnetic induction), and a first power transmission unit.
The signal transmission board 13 and the second signal transmission board 14 function as a signal transmission unit.

Hereinafter, the configurations of the power transmission coupler unit and the signal transmission unit in the present embodiment will be described in detail.

[Power Transmission Coupler Section] First, in this embodiment, as shown in FIG. 26 (B), a semi-cylindrical divided ferrite core 50 is used for the power transmission coupler section.
As shown in FIG. 27, fifteen are arranged annularly, and an air-core coil 51 is mounted in the central recess 50a of the split ferrite core 50.

The semi-cylindrical split ferrite core 50 used in the present embodiment is generally used as a clamp filter used for shielding a cable. When the ferrite core 50 is used for a clamp filter, FIG. )
As shown in FIG. 5, two semi-cylindrical split ferrite cores 50 are used in combination. Semi-cylindrical split ferrite core 5 used in such a clamp filter
In the case of 0, since it is necessary to reliably prevent the leakage of magnetic flux when aligned as shown in FIG. 26A, the processing accuracy of the surface is high and the dimensional accuracy is high. Therefore, as shown in FIG.
Each split type ferrite core 50 is connected to the support plate 15a,
Even if the support plates 15a, 1
The height from 5b can be made uniform. As a result, even when the second ferrite core coil unit 19 is set to the primary side and the first ferrite core coil unit 18 is set to the secondary side and coaxially opposed as shown in FIG. Can be kept constant.

Support plate 15 of split type ferrite core 50
A two-part epoxy adhesive that can be adhered at a low temperature was used for attachment to a and 15b. When an adhesive that bonds at a high temperature is used, cracks or the like may occur in the divided ferrite core 50 that is a fired product during cooling. However, in the present embodiment, the split ferrite core 50 can be bonded at a low temperature. Such cracks and the like do not occur.

Since the support plates 15a and 15b are formed of non-magnetic stainless steel as described above,
Even if the magnetic flux changes, no heat is generated, and the split type ferrite core 50 is not separated from the support plates 15a and 15b.

As described above, the split type ferrite core 50 annularly arranged on the support plates 15a and 15b has the structure shown in FIG.
As shown in (A), a central recess 50 penetrating from one end face 50b to the other end face 50c of the split type ferrite core 50.
a is formed. Split type ferrite core 50 is shown in FIG.
By arranging the coil as shown in FIG. 7, the coil accommodating path including the central concave portion 50a is formed in an annular shape, and the coil 51 is mounted in the accommodating path. In the present embodiment, the stationary side second ferrite core coil unit 19 is set as the primary side, and the center concave portion 50a of the split ferrite core 50 constituting the second ferrite core coil unit 19 is provided with a biferral wound air core coil 51. Attach. Further, the second ferrite core coil unit 1 on the rotating side which is the secondary side
8 of the split type ferrite core 50 constituting the core 8
A normal winding air core coil 51 is attached to a.

The transmission of the power is performed in a non-contact manner based on the principle of mutual induction (electromagnetic induction), but the stationary side is configured to transmit a deformed high-frequency signal based on a pulse-like waveform. On the other hand, on the rotating side, the ripple-like power supply fluctuation is rectified and adjusted to a predetermined power supply voltage by a DC / DC converter or the like.

In this case, as shown in FIG. 28 (A), if the primary side coil and the secondary side coil are normally wound, the primary side signal is turned on / off, and as shown in FIG. 28 (B).
The power is transmitted at a frequency of around kHz, but in this case, the ratio of the stop time is high, and the transmission efficiency is deteriorated.

Therefore, in this embodiment, FIG.
As shown in (A), the primary side is bi-ferrule wound,
By making the secondary side a normal winding, the on / off of the primary side is alternately repeated, and as shown in FIG.
As a frequency around 0 kHz, the secondary side synthesizes this to increase the efficiency.

In this embodiment, the split type ferrite core 5
By mounting the air-core coil 51 wound about 30 turns in the center recess 50a of 0, transmission of power by the principle of mutual induction as described above is enabled. Air core coil 51
A so-called alcohol fusion wire, in which a surface of a coil formed of a copper wire is coated with a resin that melts with methyl alcohol, is used. In the present embodiment, the alcohol fusion wire is wound by a winding device for about 30 turns and then immersed in methyl alcohol. This allows
The resin coated on the surface of the coil is melted, and the entire air-core coil 51 is solidified. Then, as shown in FIG. 26 (C), the air core coil 51 thus hardened is bonded to the central recess 50a with an epoxy adhesive. Therefore, as shown in FIG. 27, the air-core coil 51 also has a function of pressing down the entire split-type ferrite core 50 and preventing the split-type ferrite core 50 from being detached from the support plates 15a and 15b.

As described above, in the present embodiment, fifteen half-cylindrical divided ferrite cores 50 are arranged in an annular shape, and an air core of about 30 turns is provided in the center recess 50a of the divided ferrite core 50. By mounting the coil 51, a pair of ferrite core coil units is formed, so that a power transmission coupler with very little leakage of magnetic flux can be formed as in the case of using the pot type ferrite core, and the diameter is as large as 200 mm. Can be formed to a diameter. Therefore, as shown in FIG. 24, even when the hollow shaft 2 having a diameter of 90 mm is formed for the cooling water, the first ferrite core coil unit 18 and the second ferrite core coil unit 19 are arranged on the outer periphery of the hollow shaft 2. Therefore, the space for disposing the cooling roll 25 in the rotation axis direction can be given a margin.

[Signal Transmission Section] Next, the first signal transmission board 13 and the second signal transmission board 14, which constitute the signal transmission section,
As shown in FIGS. 30 and 31, respectively, the first signal transmission board 13 and the second signal transmission board 1 in the first embodiment.
4 is substantially the same as that of the first embodiment, except that the signal transmission pattern 61 and the ground pattern 62 are separated from each other at intervals of a length d at a plurality of locations.

The printed board 60 is formed by forming a board made of glass epoxy into a ring shape. The width W1 of the ring-shaped printed board 60 is equal to the split type ferrite core 50.
Is slightly smaller than the width of the central concave portion 50a.
Therefore, the first signal transmission board 13 and the second signal transmission board 1
4 can be fitted into the central recess 50a of the split ferrite core 50. In the present embodiment, as shown in FIG.
The first signal transmission board 13 and the second signal transmission board 14 are fitted into the central recess 50a of the split type ferrite core 50,
It is mounted so as to cover the coil 51 of the ferrite core coil unit. FIG. 26D shows a vertical cross-sectional view taken along the line AA ′ in FIG. By adopting such a configuration, the first signal transmission board 13 and the second signal transmission board 1
There is no need to separately secure the arrangement space in the radial direction of the ferrite core coil unit, and the rotary joint 1 can be downsized. Also, FIG.
As shown in (D), the coil 51 is pressed by the first signal transmission board 13 and the second signal transmission board 14,
Can surely be prevented from falling off.

The shape and size of the printed circuit board 60 are the same for both the first signal transmission board 13 and the second signal transmission board 14, as in the first embodiment. Also, the signal transmission pattern 61 and the ground pattern 62
Similarly to the embodiment of the low resistivity metal, for example, silver,
It can be formed of copper or aluminum. In the present embodiment, as an example, a pattern formed of a copper foil is used. Further, in the signal transmission pattern 61 and the ground pattern 62, four gaps having a width d are provided, and each of the signal transmission pattern 61 and the ground pattern 62 is divided into four arc-shaped patterns. Also,
As shown in FIG. 31, in the second signal transmission board 14, gaps having a width d are provided at three places, and each of the signal transmission pattern 61 and the ground pattern 62 is divided into three arc-shaped patterns. I have.

At the end of each arc-shaped pattern,
As shown in FIGS. 30 and 31, a through hole 67 is provided which is electrically connected to a land on the back side of the printed circuit board 60. A chip capacitor 66 is connected to the land on the back side as shown by a dotted line in FIG. Therefore, the respective arc-shaped patterns are connected via the chip capacitor 66, and function as a ring-shaped pattern for a signal of a predetermined frequency.

As described above, in the present embodiment, the first
The ground pattern 62 and the signal transmission pattern 61 on the signal transmission board 13 and the second signal transmission board 14 have a DC shape divided by a gap having a length d, but have an AC As in the first embodiment, the pattern has a double ring structure.

Further, a feeder line 65 taken out from a coaxial cable 64 is connected to a feeder point 63 provided in each pattern, as in the first embodiment. Then, a signal of a predetermined frequency is simultaneously supplied to each feeding point 63 on the signal transmission pattern 61 on the first signal transmission board 13 on the transmission side via a feeding line 65. The lengths of the power supply lines 65 are equal, and the phases of the signals supplied to the power supply points 63 are aligned. Further, as shown in FIG. 24, the first transmission board 13 and the second transmission board 14 are arranged facing each other at an interval of 0.5 to 1.0 mm.
The signal transmission patterns 61 and the ground patterns 62 are capacitively coupled via an air layer.

As described above, the signal transmission unit of this embodiment cuts the coaxial cable in a vertical section perpendicular to the central axis,
It is equivalent to each of which is capacitively coupled. Therefore,
Ground pattern 6 orthogonal to signal transmission pattern 61
An electric field generated in two directions and a magnetic field generated orthogonal to the electric field and surrounding the signal transmission pattern 61, ie, a direction orthogonal to both directions, that is, from the first transmission substrate 13 to the second transmission substrate 1.
The transmission of the signal is performed by the movement of the electromagnetic energy in the direction toward 4. That is,
In the present embodiment, signal transmission is performed by a method equivalent to that of a coaxial cable, not by signal transmission by an antenna pair, but by a double ring-shaped structure of patterns, simultaneous power supply at multiple points, and capacitive coupling.

When the frequency of the signal to be transmitted is a high frequency equal to or higher than the VHF band as in this embodiment, the signal is transmitted on the surface of the center conductor of the coaxial cable due to the surface effect. On the other hand, the characteristic impedance of the signal transmission board of this embodiment, which is equivalent to a coaxial cable cut in a vertical section perpendicular to the central axis, is shown in FIGS.
As shown in the figure, the gap W2 between the inside of the ring-shaped ground pattern 62 and the outside of the ring-shaped signal transmission pattern 61
Is determined by Therefore, by using a signal transmission board having the same interval W2 between the transmitting side and the receiving side, it is possible to transmit a signal in a state where the impedances of the transmitting side and the receiving side are matched, and to generate a standing wave. Broadband signal transmission can be performed with practically no problem.

Further, the capacitance value x [pF] in the capacitive coupling
Is the distance between the first signal transmission board 13 and the second signal transmission board 14 as G [mm], and the area of the signal transmission pattern 61 or the ground pattern 62 as a [(width [mm] × length [mm] / 1000). ], Assuming that the relative permittivity of the printed circuit board 60 is y,

[0106]

X = (y × 8.854 × a) / G Therefore, it is possible to transmit a signal in a desired band by determining values such as the interval G and the width and length of each pattern so that the capacitance value x becomes an appropriate value.

In this embodiment, the width, the total length, and the width of each of the signal transmission pattern 61 and the ground pattern 62 are different.
The distance W2 between the signal transmission pattern 61 and the ground pattern 62 is determined by the first signal transmission board 13 and the second signal transmission board 1
4 are set to the same value.

Further, the number of the feeding points 63 is configured to be N-1 on the pattern of the first signal transmission board 13 and N-1 on the pattern of the second signal transmission board 14. In the present embodiment, as an example, four feeding points 63 on the pattern of the first signal transmission board 13 and three feeding points 63 on the pattern of the second signal transmission board 14.
Is provided. With this configuration, as in the present embodiment, the first signal transmission board 13 and the second signal transmission board 1
4 does not rotate relative to each other, the first signal transmission board 13 and the second signal transmission board 14 do not have a positional relationship in which all feeding points 63 face each other at the same time.
A substantially flat signal transmission characteristic can be obtained in a wide band.

The signal transmission characteristics of the signal transmission section of this embodiment were examined in the same manner as in the first embodiment. As in the first embodiment, -2 dBm was obtained over a wide band from 300 MHz to 550 MHz. The loss was of the order.

Also in the signal transmission section of this embodiment, the signal transmission pattern of the double ring structure and the ground pattern are capacitively coupled, one of which is N, and the other is N-1.
Since multi-point power supply is performed, flat characteristics can be obtained in a wide band like a coaxial cable.

Further, in this embodiment, the first signal transmission board 13 and the second signal transmission board 14 as described above are fitted into the central recess 50a of the split ferrite core 50 in the ferrite core coil unit. Therefore, the size of the rotary joint 1 can be reduced. Even when the power transmission coupler unit and the signal transmission unit are overlapped in this manner, the signal transmission substrate 1
The transmission frequency of the power by the power transmission coupler unit is 20 kHz to 30 kHz, whereas the transmission frequency of the signal by the power transmission units 3 and 14 is 340 MHz.

In the present embodiment, as shown in FIGS. 30 and 31, the signal transmission pattern 61 and the ground pattern 62 are not formed as one continuous ring, but are formed from one continuous ring. Since the minute arc region having a length d is removed at a plurality of positions and divided into a plurality of arc-shaped patterns, each of the arc-shaped patterns is insulated from a direct current. Therefore, the signal transmission pattern 6
1 and the ground pattern 62, the closed circuit through which the circulating current flows as described above is not formed. Therefore, even if the signal transmission pattern 61 and the ground pattern 62 are directly affected by the magnetic flux, the generation of the circulating current does not occur. It can be reliably prevented. Further, in the present embodiment, each feeding point 63
By providing a gap of the length d at a position between the power supply line 65 and an arc-shaped signal transmission pattern 61 or a ground pattern 62 in which a power supply point 63 connected to the power supply line 65 is formed. The power supply point 63 adjacent to the power supply point 63 and another power supply line 65 connected to the power supply point 63 adjacent to the power supply point 63 prevent a closed circuit from being formed. Therefore, even between the power supply line 65 and the pattern, it is possible to prevent the generation of the circulating current due to the change in the magnetic flux. In addition, adjacent arc-shaped patterns are similar to each other in FIG.
Since the connection is made by the chip capacitor 66 as shown in FIG. 3, the conductive state is maintained in terms of AC, and the signal can be transmitted well.

In the present embodiment, with the above configuration, it is possible to transmit a signal with flat characteristics over a wide band. In addition, since it can be made to be almost omnidirectional, efficient signal transmission can be performed even when used in a rotating system. Furthermore, since a circulating current is not generated due to the influence of the magnetic flux, loss of the magnetic flux from the power transmission coupler unit can be prevented, and power transmission can be performed satisfactorily. Further, loss of the signal transmitted by the signal transmission pattern 61 and the ground pattern 62 can be prevented, and the signal can be transmitted efficiently. Furthermore,
Since the occurrence of the circulating current can be prevented, the printed board 60 can be reliably prevented from being melted by Joule heat. Further, the signal transmission as described above cannot be performed simply by separating each pattern as an arc-shaped pattern. However, in the present embodiment, as described above, between each arc-shaped pattern, Since the configuration is such that the chip capacitor is mounted, each arc-shaped pattern is in a conductive state in terms of AC, so that signals can be transmitted well.

Since the generation of the circulating current can be prevented as described above, the first signal transmission board 13 and the second signal transmission board 14 are fitted into the central recess 50a of the split type ferrite core 50 in the ferrite core coil unit. A configuration that allows the rotary joint 1 to be downsized can be realized.

That is, according to the configuration of the present embodiment, the ferrite core coil unit and the first signal transmission board 13 and the second signal transmission board 14 can be overlapped as described above. Can be reliably prevented from increasing in the radial or axial direction.

Next, the operation of transmitting power and signals in the rotary joint 1 for transmitting measurement signals and power according to the present embodiment will be described with reference to the block diagram of FIG.

A change in the resistance value of the resistance temperature detector 11 connected to the resistance temperature converter 8 via a rotation side connector (not shown) is converted into a current in the resistance temperature converter 8, and this current is converted into an A / F. In the converter 9, the signal is converted into a predetermined frequency pulse signal according to the value. In the present embodiment, a 1000 Ω resistor is used as the resistance temperature detector 11, and the output signal when converted into a current by the resistance temperature converter 8 is 4 ° for a temperature of 0 ° C. to 100 ° C. ~ 20m
A. The carrier frequency is 340 MH
z is used. And this frequency pulse signal is F
The signal is frequency-modulated in the signal transmitter 10 and transmitted from the first signal transmission board 13 to the second signal transmission board 14. In the present embodiment, the transmission rate is set to 2 Mbps. On the other hand, the signal transmitted in this manner is received by the stationary receiver 40 via the second signal transmission board 14,
The current is converted into a current in the F / A converter 41. Therefore,
The surface temperature of the cooling roll 25 can be detected on the stationary side. As described above, since the signal transmission is performed through the non-contact first signal transmission board 13 and the second signal transmission board 14, the change in the resistance value of the resistance temperature detector 11 is not affected, and the accurate temperature Detection can be performed. Also,
In the present embodiment, when the cooling roll 25 rotates at 1000 rpm, the rotating portion of the rotary joint 1 for transmitting the measurement signal and the power also rotates at 1000 rpm. No temperature deterioration is possible, and good temperature detection is possible for a long period of time.

The power is converted from 100 V AC to 28 V DC in the power converter 42 on the stationary side, and supplied at a frequency of 30 kHz to the bifilar-wound coil 51 in the second ferrite core coil unit 19 on the primary side. . As a result, a pulsed current flows through the coil 51 of the second ferrite core coil unit 19, and a magnetic flux that changes according to a change in the current passes through the coil 51 of the second ferrite core coil unit 19. Then, the change in the magnetic flux causes an induced electromotive force in the coil 51 of the first ferrite core coil unit 18 on the secondary side, and is supplied to the power converter 7. In the power converter 7, the DC 24
V and a voltage of ± 15 V DC and supplied to each circuit in the electric circuit unit 12. In the present embodiment, the rotating part of the rotary joint 1 for transmitting the measurement signal and the power supply rotates at a maximum of 1000 rpm.
Since power is supplied in a non-contact manner, no spark such as a slip ring is generated and no explosion occurs even in a solvent atmosphere. In addition, since there is no contact, there is no deterioration due to wear and the like, and good power supply can be performed for a long time.

The above-mentioned bearings 5a, connectors (not shown) and the like are all water-resistant. The first housing member 4 and the second housing member 6 are composed of the electric circuit unit 12, the power transmission coupler, and the signal transmission. Since the substrate is covered in a substantially sealed state, even if the rotary joint 1 according to the present embodiment is used for the cooling roller 25 using cooling water, there is no danger of failure of an electric circuit or the like due to water and a leakage accident.

As described above, in the present embodiment, while the power supply is stably supplied for a long period of time, the temperature measuring resistor 1
Since one measurement signal, that is, a change in resistance value, is transmitted to the stationary side in a non-contact manner, accurate temperature detection is performed over a long period of time.

The excellent effects of the rotary joint 1 having the power transmission coupler according to the present embodiment as described above become clearer by comparing with the conventional power supply means. For example, the most common example of the means for supplying power to the rotating body is a slip ring. However, since the slip ring has a large frictional resistance, the slip ring has a maximum frictional resistance such as the rotary joint of the present embodiment. In a device that requires a rotation speed of 1000 rpm, it is not suitable because it hinders the increase of the rotation speed.
In addition, the contact portion of the slip ring is worn out over a long period of use, so that periodic replacement is required.

On the other hand, since the power transmission coupler of the present embodiment is of a non-contact type, it has no frictional resistance and can easily increase the rotation speed to the allowable range of the bearing. In addition, although it is electrically non-contact type, there is no wear. However, since rotation depends on the durability of the bearing, it can be used for a long time.

A configuration in which a battery is provided inside the rotating body is also conceivable, but such a configuration requires periodic battery replacement and charging.

On the other hand, since the power transmission coupler of the present embodiment supplies power in a non-contact manner by using electromagnetic induction, there is no need to replace components.

The power transmission coupler of this embodiment is originally
By arranging the semi-cylindrical split ferrite core used for the clamp filter for shielding the cable in a ring shape, it is possible to form a large ferrite core similar to a pot type shape, so a hollow for cooling water can be formed. A power transmission coupler can be arranged on the outer periphery of the shaft. As a result, as is clear from the comparison between FIG. 33 (A) and FIG. 33 (B), the entire length of the cooling roll unit including the rotary joint is set to the length W (about 300 mm in the example of FIG. 33 (B)). Can be shortened. Further, the entire length of the cooling roll unit of the present embodiment is longer than that of the conventional cooling roll unit by the amount of the rotary joint 1 for transmitting the measurement signal. Is designed to reduce the length
It is only about mm longer. Therefore, in a system in which a cooling roll unit is stored in a rack using a crane or the like and the cooling roll unit is exchanged by being transported from the rack, a rack having the same size as the conventional one can be used. It can be used effectively.

In the above-described embodiment, the case where the present invention is applied to the rotary joint for the cooling roll has been described. However, the present invention is not limited to this. Or a rotary joint that supplies gas such as gas, or passes a thick cable or the like through a hollow shaft. In this case, a heat insulating material may be provided at the position of the air layer 3c depending on the situation. However, especially when the rotary joint for transmitting the measurement signal and the power supply of the present invention is applied to a cooling roll using cooling water, the above-described water-resistant treatment is performed, so that a particularly excellent effect is exhibited. Things.

In the above-described embodiment, the number of split ferrite cores is set to fifteen as an example.
The present invention is not limited to this, and may be an appropriate number according to the size of the split type ferrite core to be used or the size of the diameter of the power transmission coupler. Also, the number of turns of the coil was set to about 30 turns as an example,
The present invention is not limited to this, and can be appropriately modified.

The split ferrite core applicable to the present invention is not limited to a semi-cylindrical shape, and an existing E-shaped or U-shaped split ferrite core can also be used. Further, a ferrite core having such a shape that no gap is formed when the split type ferrite core is annularly arranged may be newly manufactured. By doing so, the transmission efficiency can be further improved.

Further, instead of using a split type ferrite core, a large pot type ferrite may be newly manufactured and used. In this case, the leakage of the magnetic flux can be more reliably prevented.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the first embodiment, an example in which the first ferrite core coil unit 18 and the second ferrite core coil unit 19 are used in a rotating system has been described. However, the present invention is not limited to such a configuration. Rather, any configuration that transmits signals and power in a non-contact manner is applicable to stationary systems.

For example, as shown in FIG. 34, the first ferrite core coil unit 18 and the second ferrite core coil unit 19 may be arranged in close contact. This pair of ferrite core coil units is formed by combining each of the split ferrite cores 50 of the first ferrite core coil unit 18 and each of the split ferrite cores 50 of the second ferrite core coil unit 19 forming a pair. The ferrite core is adhered to form a ferrite core.

The first ferrite core coil unit 18 and the second ferrite core coil unit 19 are made of a two-liquid epoxy-based adhesive which can be adhered at a low temperature, as in the first embodiment, respectively. The support plates 15d and 15e are used as holding metal fittings for bringing the pair of ferrite core coil units into close contact with each other. In this embodiment, the first ferrite core coil unit 18 and the second ferrite core coil unit 19
Is fixedly used without relatively rotating. FIG. 35 shows the appearance.

As described above, according to the present embodiment, a transformer having the same configuration as a conventional transformer using a pot-type ferrite core is configured as a large-diameter transformer using the split-type ferrite core 50, and An apparatus capable of transmitting a signal over a wide band with flat characteristics can be provided. Therefore, even when the arrangement space is limited and it is difficult to attach a transformer or a coaxial cable as in the related art, the power supply and the signal can be transmitted satisfactorily.

In the configuration of the present embodiment, the first ferrite core coil unit 18 and the second ferrite core coil 19 are not rotated, and therefore have the same size and shape as each other, and accommodate the air-core coil 51 by the central recess 50a. If the path can be formed in an endless circulation path shape, it is not necessary to form the path in an annular shape as in the first embodiment. For example, the split ferrite cores 50 may be arranged in a chain so as to have an elliptical shape, or the elliptical ferrite core 50a may be manufactured. In this case, the printed circuit board 60 may be similarly formed into an elliptical shape. Also, a square ferrite core 5
0b or a triangular ferrite core 50c and a printed circuit board 60 of each shape may be used.

Further, the present invention is not limited to the example in which the signal transmission board is provided together with the power supply coupler.
The present invention can also be applied to a stationary system in which only the signal transmission board shown in FIG. In any of the stationary systems, the signal transmission board of the present invention has a plurality of feeding points, and can obtain substantially non-directional characteristics.
There is an advantage that adjustment is easy.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment or the third embodiment are denoted by the same reference numerals, and the description is omitted.

In this embodiment, as shown in FIG. 36, a signal transmission board is mounted inside a transformer comprising a pot type ferrite core and a coil.

In the hollow portions of the pot-type ferrite cores 57 and 58, as shown in FIG. 36, a bobbin 52 integrally formed with a temporary winding portion and a secondary winding portion is accommodated. . In each winding part of this bobbin 52,
The formal wire is wound a predetermined number of times to form a coil.

The pot type ferrite cores 57, 5
The first signal transmission board 13 and the second signal transmission board 1 in which the signal transmission pattern and the ground pattern are separated at intervals of the length d as in the third embodiment, on the bobbin 52 stored in the
4 are placed so as to have a predetermined interval from each other. As described above, in the present invention, if the distance between the signal transmission pattern 61 and the ground pattern 62, the distance between the first signal transmission board 13 and the second signal transmission board 14, and the like satisfy the predetermined relationship as described above. Regardless of the diameter, a signal transmission unit having flat characteristics in a wide band can be configured.

After the coils and the ferrite cores 57 and 58 accommodating the first signal transmission board 13 and the second signal transmission board 14 are overlaid as shown in FIG.
6 are bonded at two points, and are used in a columnar appearance so that the coil and the signal transmission board are not exposed. By using in this way, the leakage magnetic flux can be reduced, and it can be applied to various uses.

When the ferrite cores 57, 58 accommodating the coil and the first signal transmission board 13 and the second signal transmission board 14 as described above are mounted on a housing or the like, the presser fitting 54 shown in FIG. , 55 are used.
The holding metal fittings 54 and 55 are formed of a non-magnetic material such as, for example, western white, and the upper holding metal fitting 54 has a side opening 5.
4a, and the lower holding metal 55
Is formed with a projection 55a corresponding to the side opening 54a of the holding member 54. These holding brackets 5
The holding members 54 and 55 are connected to the ferrite core 5 as shown in FIG.
By fitting the ferrite cores 57 and 58 from above and below, the ferrite cores 57 and 58 can be held. Also,
The bottom protrusion 55b formed on the lower holding metal 55 is
By inserting the ferrite cores 57 and 58 and the coil into a housing or the like, the transformer can be attached to the housing or the like.

According to the present embodiment as described above, an apparatus capable of simultaneously performing efficient power supply transmission and signal transmission with good flat characteristics over a wide band while being small is provided. Can be provided.

[0144]

According to the signal transmission board of the first aspect,
In the signal transmission board of the microstrip antenna type, the signal transmission pattern is formed so that at least the outer peripheral edge has a circular shape, and the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern. Even when the signal transmission boards are provided in a pair and the signal transmission boards are rotated, efficient signal transmission can be performed, and the directivity is prevented from being in a single direction. The adjustment at the time of assembling the transmission board can be unnecessary or facilitated.

According to the signal transmission board of the second aspect, since the signal transmission pattern is formed in a disc shape, the area of the signal transmission pattern can be made larger than that of a linear microstrip antenna. The frequency band of a signal that can be transmitted can be expanded. In addition, efficient signal transmission can be performed, and the directivity can be prevented from becoming a single direction, so that adjustment at the time of assembling the pair of signal transmission boards can be made unnecessary or easy.

According to the signal transmission board of the third aspect, since the signal transmission pattern is formed in a ring shape, the area of the signal transmission pattern can be made larger than that of a linear microstrip antenna, and transmission is possible. The frequency band of a simple signal can be expanded. In addition, efficient signal transmission can be performed, and the directivity can be prevented from becoming a single direction, so that adjustment at the time of assembling the pair of signal transmission boards can be made unnecessary or easy.

According to the fourth aspect of the present invention, the ground pattern is formed uniformly on the back surface of the printed circuit board.
Since the signal transmission pattern is formed in the predetermined shape on the front surface of the printed circuit board, although the magnetic flux from the signal transmission pattern wraps around to the back surface of the printed circuit board, it is directed in a single direction by the plurality of feeding points. It can be generated uniformly in each direction by reducing the properties. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, it is possible to transmit signals well even when the signal transmission boards are rotated. it can.

According to the fifth aspect of the present invention, the signal transmission pattern is formed in the predetermined shape at the center of the surface of the printed circuit board, and the ground pattern is transmitted at the peripheral portion of the surface of the printed circuit board. Since it is formed with a predetermined gap with the pattern, there is no sneak of the magnetic flux from the signal transmission pattern to the back side of the printed circuit board. Can be generated uniformly. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, signals can be transmitted efficiently even when the signal transmission boards are rotated. it can.

According to the signal transmission board of the sixth aspect, the signal transmission pattern and the grounding pattern are both formed in a ring shape on the surface of the printed circuit board to form a double ring pattern. A structure in which a coaxial cable used as a signal transmission path is cut into a ring can be realized. Further, by providing a pair of such signal transmission boards and opposing each other, the ground patterns facing each other and the signal transmission patterns can be capacitively coupled via the air layer, so that the signal transmission within the coaxial cable is performed. A signal transmission path equivalent to a path that is capacitively coupled can be realized. As a result, signal transmission in a wide band such as a coaxial cable can be performed instead of signal transmission in a specific band using an antenna.

According to the signal transmission board of the present invention, since the power supply points are provided at a plurality of positions of the signal transmission pattern and the ground pattern, it is more certain that the directivity becomes stronger in a single direction. Can be prevented.

According to the signal transmission device of the present invention, in the pair of signal transmission substrates of the microstrip antenna type, the signal transmission patterns on each of the signal transmission substrates are formed such that at least the outer peripheral edge has a circular shape. When the number of feeding points on one signal transmission board is N, the number of feeding points on the other signal transmission board is N-1. Since it was set to, in the state of impedance matching, from the signal transmission pattern of one signal transmission board to the signal transmission pattern of the other signal transmission board,
Signal transmission can be performed. In addition, a signal of a desired frequency is transmitted by setting the capacitance to a predetermined value according to the relative permittivity of the signal transmission board, the facing distance between the signal transmission boards, and the width and length of the signal transmission pattern. Can be. Further, since a plurality of feeding points are provided on the ground pattern and the signal transmission pattern, it is possible to prevent a single directivity at the time of signal transmission, and to provide a signal between the stationary side and the rotating side. In this case, transmission of power and transmission of signals can be performed stably. Further, when N feeding points are provided on the signal transmission board, N-1 feeding points are provided on the other signal transmission board facing the signal transmission board. Therefore, even when these signal transmission boards are relatively rotated, the feeding points of the opposing signal transmission boards do not overlap at all points regardless of the rotating state of each other. As a result, a dip point at which the level on the signal transmission characteristic locally drops is eliminated, and signal transmission with flat characteristics over a wide band can be performed.

According to the signal transmission device of the ninth aspect, since the signal transmission pattern is formed in a disc shape, the area of the signal transmission pattern can be made larger than that of a linear microstrip antenna. The frequency band of a signal that can be transmitted can be widened. Further, signal patterns can always be accurately opposed to each other, and efficient signal transmission can be performed. Moreover, it is possible to prevent the directivity from being in a single direction, and it becomes unnecessary or easy to make adjustments when assembling the pair of signal transmission boards. Furthermore, a dip point at which the level on the signal transmission characteristic locally drops is eliminated, and signal transmission with flat characteristics over a wide band can be performed.

According to the signal transmission device of the tenth aspect,
Since the signal transmission pattern is formed in a ring shape, the area of the signal transmission pattern can be larger than that of a linear microstrip antenna, and the frequency band of a signal that can be transmitted is widened. Also, by aligning the center position of the circular signal transmission pattern on each signal transmission board, even when rotating each signal transmission board,
Signal patterns can always be accurately opposed to each other, and efficient signal transmission can be performed. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. It can be unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to the signal transmission device of the eleventh aspect,
The ground pattern is formed uniformly on the back surface of the printed circuit board, and the signal transmission pattern is formed in the predetermined shape on the front surface of the printed circuit board. By the plurality of feeding points, directivity in a single direction can be weakened and the power can be uniformly generated in each direction. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, it is possible to transmit signals well even when the signal transmission boards are rotated. it can. Moreover, since the feeding points for the signal transmission pattern are provided at a plurality of locations on the signal transmission pattern, the directivity is prevented from being in a single direction,
Adjustment at the time of assembling the pair of signal transmission boards can be unnecessary or facilitated. Furthermore, a dip point at which the level on the signal transmission characteristic locally drops is eliminated, and signal transmission with flat characteristics over a wide band can be performed.

According to the signal transmission device of the twelfth aspect,
The signal transmission pattern was formed in the predetermined shape at the center of the surface of the printed circuit board, and the ground pattern was formed with a predetermined gap from the signal transmission pattern at the periphery of the surface of the printed circuit board. Of the magnetic flux to the back side of the printed circuit board is eliminated, the directivity in a single direction is weakened by the plurality of feeding points, and the magnetic flux is uniformly generated in each direction. Therefore, by providing such a pair of signal transmission boards and aligning the center positions of the respective ring-shaped signal transmission patterns, signals can be transmitted efficiently even when the signal transmission boards are rotated. it can. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of locations on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment at the time of assembling the pair of signal transmission boards is performed. It can be unnecessary or easy. Furthermore, a dip point at which the level on the signal transmission characteristic locally drops is eliminated, and signal transmission with flat characteristics over a wide band can be performed.

According to the signal transmission device of the thirteenth aspect,
Since the signal transmission pattern and the ground pattern are formed as a double ring pattern on the surface of the printed circuit board, a structure in which a coaxial cable generally used as a transmission path for a high-frequency signal is cut into a ring can be realized. Further, by providing a pair of such signal transmission boards and opposing each other, the ground patterns facing each other and the signal transmission patterns can be capacitively coupled via the air layer, so that the signal transmission within the coaxial cable is performed. A signal transmission path equivalent to a path that is capacitively coupled can be realized. As a result, it is possible to perform wideband signal transmission using a coaxial cable instead of signal transmission using a specific band using an antenna. In particular, the characteristic impedance of the signal transmission board on which the ground pattern and the signal transmission pattern are formed is determined by the pattern width of the signal transmission pattern, the distance between the signal transmission pattern and the ground pattern, and the like. Therefore, by using signal transmission boards having the same pattern width, spacing, and the like as opposed signal transmission boards, the impedances of the signal transmission boards can be changed from the signal transmission pattern of one signal transmission board to the other signal transmission board in an impedance-matched state. The signal can be transmitted to the signal transmission pattern. Further, the signal transmission path composed of the signal transmission pattern of the one signal transmission board and the signal transmission pattern of the other signal transmission board are disposed facing each other at a predetermined interval, and are capacitively coupled via an air layer. Will be. The capacitance is determined by the relative permittivity of the signal transmission board, the interval between the signal transmission boards facing each other, and the width and length of the signal transmission pattern. Therefore, a signal of a desired frequency can be transmitted by setting this capacity to a predetermined value. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. Unnecessary or easy. Further, a dip point at which the level on the signal transmission characteristic is locally reduced is eliminated, and signal transmission with flat characteristics is performed over a wide band.

According to the signal transmission device of the fourteenth aspect,
Since the power supply points are provided at a plurality of positions in each of the signal transmission pattern and the ground pattern, it is possible to more reliably prevent the directivity from increasing in a single direction. In addition, since the feeding points for the signal transmission pattern are provided at a plurality of locations on the signal transmission pattern, the directivity is prevented from being in a single direction, and adjustment when assembling the pair of signal transmission boards is performed. It can be unnecessary or easy. Furthermore, a dip point at which the level on the signal transmission characteristic locally drops is eliminated, and signal transmission with flat characteristics over a wide band can be performed.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an appearance of a signal transmission device according to a first embodiment of the present invention.

FIG. 2 is an exploded view showing a schematic configuration of the signal transmission device of FIG.

FIG. 3 is a plan view showing one signal transmission board used in the signal transmission device of FIG. 1;

FIG. 4 is a plan view showing another signal transmission board used in the signal transmission device of FIG. 1;

FIG. 5 is a perspective view showing a connection state of a signal transmission board used in the signal transmission device of FIG. 1;

FIG. 6 is a diagram illustrating a method for testing signal transmission characteristics in an experiment performed in the first embodiment of the present invention.

FIG. 7 is a diagram showing experimental results of the first embodiment of the present invention, wherein when a plurality of rotation-side feeding points and stationary-side feeding points are provided, the angle of the rotating-side feeding point and the stationary-side feeding point; It is a figure which shows the signal transmission characteristic when the angle of a point is relatively 0 degree.

FIG. 8 is a diagram showing experimental results of the first embodiment of the present invention, in which a plurality of rotation-side power supply points and stationary-side power supply points are provided, and an angle between the rotation-side power supply points and a stationary-side power supply; It is a figure which shows the signal transmission characteristic when the angle of a point is 90 degrees relatively.

FIG. 9 is a diagram showing experimental results of the first embodiment of the present invention, in which a plurality of rotation-side power supply points and stationary-side power supply points are provided, and an angle between the rotation-side power supply points and a stationary-side power supply; It is a figure which shows the signal transmission characteristic when the angle of a point is relatively 180 degrees.

FIG. 10 is a diagram showing experimental results of the first embodiment of the present invention, in which, when a plurality of rotation-side feeding points and stationary-side feeding points are provided, the angle of the rotating-side feeding point and the stationary-side feeding point; It is a figure which shows the signal transmission characteristic when the angle of a point is relatively 270 degrees.

FIG. 11 is a diagram illustrating the results of an experiment performed for comparison in the first embodiment of the present invention, and is a diagram illustrating signal transmission characteristics of a coaxial cable.

FIG. 12 is a diagram illustrating the results of an experiment performed for comparison in the first embodiment of the present invention, and shows a case where only one rotation-side power supply point and one stationary-side power supply point are provided; It is a figure which shows the signal transmission characteristic when the angle of a point and the angle of the feeding point on the stationary side are 0 degrees.

FIG. 13 is a diagram illustrating an experimental result performed for comparison in the first embodiment of the present invention, and shows a case where only one rotation-side power supply point and one stationary-side power supply point are provided; It is a figure which shows the signal transmission characteristic when the angle of the point and the angle of the feeding point on the stationary side are 180 degrees.

14A and 14B are diagrams illustrating a configuration of a disk-shaped microstrip antenna provided with a plurality of feeding points, and a relationship between a feeding point and directivity of the antenna; FIG. (B) is a plan view showing the number and positions of feeding points in the disk-shaped microstrip antenna of (A), and (C) shows the diameter of the disk-shaped microstrip antenna of (A). A cross-sectional view (X direction), (D) is a cross-sectional view (Y direction) showing the diameter of the disc-shaped microstrip antenna of (A), and (E) is a directivity of the disc-shaped microstrip antenna of (A). FIG.

15A and 15B are diagrams illustrating a configuration of a disk-shaped microstrip antenna provided with only one feeding point and a relationship between a feeding point and directivity of the antenna, and FIG. Perspective view showing appearance, (B)
(A) is a plan view showing the number and positions of feeding points in the disk-shaped microstrip antenna of (A), (C) is a cross-sectional view (X direction) showing the diameter of the disk-shaped microstrip antenna of (A), ( (D) is a diagram showing the directivity of the disc-shaped microstrip antenna of (A).

FIG. 16 is a perspective view illustrating a schematic configuration of a signal transmission board according to a second embodiment of the present invention (part 1).

FIG. 17 is a perspective view illustrating a schematic configuration of a signal transmission board according to a second embodiment of the present invention (part 2).

FIG. 18 is a perspective view illustrating a schematic configuration of a signal transmission board according to a second embodiment of the present invention (part 3).

FIG. 19 is a perspective view illustrating a schematic configuration of a signal transmission board according to a second embodiment of the present invention (part 4).

FIG. 20 is a perspective view illustrating a schematic configuration of a signal transmission board according to a second embodiment of the present invention (part 5).

FIG. 21 is a side view showing a schematic configuration of an extrusion laminating machine according to a third embodiment of the present invention.

FIG. 22 is a perspective view showing a schematic configuration of a cooling roller used in the laminating machine of FIG. 21.

23 is a side view showing a state where a rotary joint is connected to the cooling roller of FIG. 22. FIG. 23 (A) shows a case where the rotary joint according to the third embodiment is provided.
(B) is a diagram showing a case where a rotary joint of a comparative example is provided.

FIG. 24 is a side view of a part of the rotary joint according to the third embodiment shown in FIG.

FIG. 25 is a block diagram showing an electrical connection relationship of a rotary joint according to a third embodiment of the present invention.

26A and 26B are views showing a split type ferrite core according to a third embodiment of the present invention, wherein FIG. 26A is a perspective view showing the split type ferrite core, and FIG. 26B is a view showing the split type ferrite core of FIG. A side view as viewed from one end face 50a side, (C) is a side view showing a state in which an air core coil 51 is attached to a central concave portion 50a of the split ferrite core of (A), and (D) is an air core of (C). FIG. 3 is a side view showing a state where a signal transmission board is mounted so as to cover a coil 51;

FIG. 27 is a plan view illustrating a configuration of a ferrite core coil unit according to a third embodiment of the present invention.

28A is a diagram illustrating an example of a coil configuration in a transformer using electromagnetic induction as a comparative example, and FIG. 28B is a diagram illustrating a current waveform in the coil configuration of FIG.

FIG. 29A is a diagram illustrating an example of a coil configuration of a power transmission coupler according to a third embodiment of the present invention, and FIG. 29B is a diagram illustrating a current waveform in the coil configuration of FIG.

FIG. 30 is a plan view showing one signal transmission board according to the third embodiment of the present invention.

FIG. 31 is a plan view showing another signal transmission board according to the third embodiment of the present invention.

FIG. 32 is a plan view showing a ferrite core coil unit according to a third embodiment of the present invention.

FIG. 33 is a plan view showing one signal transmission board according to the third embodiment of the present invention in which a chip capacitor is mounted between a signal transmission pattern and a ground pattern.

FIG. 34 is a cross-sectional view illustrating a configuration of a ferrite core coil unit pair according to a fourth embodiment of the present invention.

FIG. 35 is a perspective view showing an appearance of the ferrite core coil unit pair of FIG. 34;

FIG. 36 is an exploded perspective view showing a configuration of a ferrite core coil unit pair using a pot type ferrite core according to a fourth embodiment of the present invention.

FIG. 37 is a perspective view showing an appearance of a ferrite core coil unit pair using a pot type ferrite core according to a fourth embodiment of the present invention.

FIG. 38 is a cross-sectional view illustrating a method of attaching a ferrite core coil unit pair using a pot-type ferrite core according to the fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotary joint 2 ... Hollow shaft 4 ... 1st housing member 5a, 5b ... Bearing bearing 6 ... 2nd housing member 13 ... 1st signal transmission board 14 ... 2nd signal transmission board 15a, 15b ... Support plate 18 ... 1st Ferrite core coil unit 19: second ferrite core coil unit 50: cylindrical split ferrite core 51: hollow core coil 57, 58: pot type ferrite core 60, 60 ': printed circuit board 61, 61': signal transmission pattern 62 , 62 '... ground pattern 63 ... feeding point 64 ... coaxial cable 65 ... feeding line 100 ... signal transmission device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toyoka Sano 3-766-16 Shinko Chuo, Ishikari-shi, Hokkaido Inside the Force (72) Inventor Akira Morishita 3-766-1 Shinko Chuo, Ishikari-shi, Hokkaido Force, Ltd. (72) Inventor Takeo Oe 3-766-1 Shinko-chuo, Ishikari-shi, Hokkaido F-term in the Force Co., Ltd. (Reference) 5J011 EA01 5J045 AA02 AA21 DA06 EA07 HA06 MA04

Claims (14)

[Claims] 1. A microstrip antenna type signal transmission board having a ground pattern and a signal transmission pattern formed on a printed board, wherein the signal transmission pattern has at least an outer peripheral edge formed in a circular shape, A signal transmission board, wherein feed points for the pattern are provided at a plurality of positions on the signal transmission pattern. 2. The signal transmission board according to claim 1, wherein the signal transmission pattern is a pattern formed in a disk shape. 3. The signal transmission board according to claim 1, wherein the signal transmission pattern is a pattern formed in a ring shape. 4. The ground pattern is uniformly formed on the back surface of the printed circuit board, and the signal transmission pattern is
4. The printed circuit board according to claim 1, wherein the predetermined shape is formed on a surface of the printed circuit board.
The signal transmission board as described. 5. The signal transmission pattern is formed in the predetermined shape at the center of the surface of the printed circuit board, and the ground pattern is formed at a predetermined gap from the signal transmission pattern at the periphery of the surface of the printed circuit board. The signal transmission board according to any one of claims 1 to 3, wherein the signal transmission board is formed to have: 6. The signal transmission board according to claim 5, wherein the signal transmission pattern and the ground pattern are both double ring-shaped patterns formed in a ring shape on the surface of the printed circuit board. . 7. The signal transmission board according to claim 1, wherein the power supply points are provided at a plurality of positions of the signal transmission pattern and the ground pattern, respectively. 8. A signal transmission device comprising: a pair of microstrip antenna-type signal transmission boards each having a ground pattern and a signal transmission pattern formed on a printed circuit board, and facing each other with a predetermined gap therebetween. The signal transmission pattern on the transmission board,
At least the outer peripheral edges are formed in a circular shape, and the pair of signal transmission boards are arranged so as to be rotatable with respect to each other such that the centers of the at least outer peripheral edges coincide with the centers of the circular signal transmission patterns, respectively. The feeding points for the signal transmission pattern are provided at a plurality of positions on the signal transmission pattern. If the number of feeding points on one signal transmission board is N, the number of feeding points on the other signal transmission board is N -1 is set to -1. 9. The signal transmission device according to claim 8, wherein the signal transmission pattern is a pattern formed in a disk shape. 10. The signal transmission pattern according to claim 8, wherein the signal transmission pattern is a pattern formed in a ring shape.
The signal transmission device according to claim 1. 11. The ground pattern is formed uniformly on the back surface of the printed circuit board, and the signal transmission pattern is formed in the predetermined shape on the surface of the printed circuit board. The signal transmission device according to claim 8. 12. The signal transmission pattern is formed in the predetermined shape at the center of the surface of the printed circuit board,
The signal transmission device according to any one of claims 8 to 10, wherein the ground pattern is formed at a peripheral portion of a surface of the printed board with a predetermined gap from the signal transmission pattern. 13. The signal transmission device according to claim 12, wherein the signal transmission pattern and the ground pattern are double ring-shaped patterns formed in a ring shape on the surface of the printed circuit board. . 14. The signal transmission device according to claim 8, wherein a power supply point is provided at each of a plurality of positions of the signal transmission pattern and the ground pattern.