JPH0624330B2 - First and second inter-system signal transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention can prevent relative rotation, such as between a rotary system and a rotary system having different rotational speeds, or between a rotary system and a fixed system. The present invention relates to first and second inter-system signal transmission devices that perform signal transmission between the occurring first system and second system. As a specific application example, for example, in a bottom digging machine, this device is attached to a kerry bar that rotates a bucket and a fixed side of a kerry bar rotation drive section that faces the kerry bar,
It is used, for example, to transmit the signals generated from the bucket spread detector and the drop detector to the driver side.

[Conventional technology]

As a conventional signal transmission device between the first system and the second system in which relative rotation occurs, (a) a slip ring system, (b) an optical signal transmission / reception system, (c) There were things such as the method of transmitting and receiving radio signals.

[Problems to be Solved by the Present Invention]

However, the slip ring type (a) has a problem that when a fast signal is transmitted, noise is generated or the signal is lost, and the signal cannot be transmitted well. In addition, the optical signal transmission / reception method (b) is often blocked by polluted air, smoke, rain and snow when used outdoors,
It is easy to cause poor transmission. In addition, (c) the method of transmitting and receiving radio signals has a problem in reaching the distant place when using normal radio signals, and there is a problem with the Radio Law.To prevent this, if the output is reduced, noise generated from the surrounding power source etc. In addition to the drawback that it cannot be distinguished, there is a problem that if a metal structure, a metal material, etc. are close to each other, it will be greatly affected.

The object of the present invention is to provide a first system and a second system in which relative rotation occurs.
Signal transmission to and from the system can be performed without any trouble, whether it is a fast signal or outdoors, and this signal does not propagate far and is not affected by metal structures, etc. To provide a device.

[Means for solving problems]

In the signal transmission device of the present invention which achieves the above object, the first antenna and the second antenna are installed to face each other in the relatively rotating first system and second system, respectively. In a first and a second inter-system signal transmission device for transmitting a signal between antennas, the first antenna is connected to a loop-shaped second antenna only by a magnetic field wave so that a center of rotation is provided. The first position on the substantially concentric arc where the arc is bisected from the input end
In the first half loop, the first half loop, the circular loop that is folded back around the first folding section to the second folding section that is close to the first folding section, and the second folding section. And a second half loop which is folded back and reaches an output end adjacent to the input end.

[Work]

As described above, the first antenna has a special double loop type including the first half loop, the circular loop, and the second half loop. It is equivalent to the one arranged above. With such a small loop antenna, since the signal is not propagated far due to the small loop, there is no problem under the Radio Law, and the signal is well transmitted around the circle formed by this small loop antenna row. It

Further, since the first antenna is coupled to the second antenna only by the magnetic field wave without using the electric field wave, the transmitting effect does not deteriorate even if the antenna gets wet due to rain, snow, or the like. If the first antenna is electrostatically shielded, the influence of rain, snow, etc. can be eliminated.

Further, in a normal loop antenna, if a metal structure, a metal material, etc. are brought close to each other within the diameter range of the loop, a malfunction occurs, but since this first antenna is equivalent to an alignment body of small loop antennas, the metal structure It can be installed close to objects and equipment.

〔Example〕

The signal transmission device for 1st and 2nd systems of this invention is the rotation center of the 1st system (2) which rotates as an example is shown in FIG.
A first antenna (3) concentrically installed with respect to (1),
It is constituted by a loop-shaped second antenna (5) installed so as to face the first antenna (3) in a second system (4) fixed adjacent thereto.

FIG. 1 and FIG. 2 show a first embodiment of the first antenna (3), in which one side outer periphery on an arc substantially concentric with the rotation center (1) from the input end (3a). The first half loop (3c) reaching the first turn-back portion (3b) and the first turn-back portion (3b) are turned inward to make a turn around the inside of the first half-loop (3c). The outer side of the circular loop (3e) is folded back outward at the circular loop (3e) reaching the second folded portion (3d) close to the folded portion (3b) and outward at the second folded portion (3d). And a second half loop (3g) extending to the output end (3f) adjacent to the input end (3a), and is coupled only to the magnetic field wave to the loop-shaped second antenna (5). It is configured as follows.

Further, FIG. 5 shows a second embodiment of the first antenna (3), and the first half loop (3c) includes the first folded portion (3).
The circular loop (3e), which is folded back upwards (or downwards) at b) and which makes one round continuously with this, is formed by the second folded portion (3).
It is folded back downward (or upward) at d) and is continuous with the second half loop (3g).
c), the circular loop (3e), and the second half loop (3g) are arranged in two stages, upper and lower, on an arc of the same diameter.

In each of the above embodiments, the input end of the first antenna (3)
The electric current applied to (3a) first flows through the first half loop (3c) in the direction of the arrow to reach the first turnaround portion (3b), and at the first turnaround portion (3b), the circular loop (3e). ), And flows in the direction opposite to the first half loop (3c), and the second folded portion
It reaches (3d), and further flows into the second half loop (3g) at the second folded portion (3d), and this second half loop (3g) flows in the direction of the arrow in the direction opposite to the circular loop (3e). , To the output end (3f).

That is, the adjacent inner and outer loops (3e) and (3c), (3e)
Since the current flows in the opposite directions to and (3g), this first antenna (3) is equivalent to a large number of small loop antennas (6) arranged on the same circumference as shown in the fourth illustration. become.

In the above embodiment, the first system (2) having the first antenna (3) is the rotating system and the second system (4) having the second antenna (5) is the fixed system. This may be set in reverse, or the first and second systems (2) and (4) may be rotary systems having different rotational speeds. Furthermore, the second antenna (5)
May have a double loop structure having two folded portions similarly to the first loop antenna (3).

FIG. 6 shows an example of use of the signal transmission device of the present invention. In this example, the data signal input to the input terminal (3a) of the first antenna (3) provided in the rotating first system
(7) is magnetically coupled and transmitted to the loop-type second antenna (5) provided in the fixed second system, amplified by the amplifier (8), and then the phase-locked loop circuit (PLL) (9). ), The phase is synchronized and the signal is output.

FIG. 7 shows another example of use of the signal transmission device of the present invention, in which the second antenna (5) is also used in a double loop structure having two folded portions.

FIG. 8 shows the first antenna for an object in which a cylindrical metal material (11) is projected in the center of a disk-shaped metal structure (10).
In the example of using (3), insert the metal material (11) into the loop of the antenna (3), and attach it by lifting the width of the double loop from the metal structure (10) with the insulator (12). There is. Even if it is attached and used as described above, the first antenna (3) is equivalent to the assembly of the small loop antennas (6) as described above, and therefore can be used without any trouble.

Further, FIG. 9 shows the first antenna (3) as described above for the second antenna.
This is an example of use in the case of the configuration of the embodiment, and in this case, the first antenna (3) can be used by being attached to, for example, a cylindrical body or a shaft (13).

[Effect]

As described above, according to the device of the present invention, (a) the first antenna has the first half loop extending from the input end approximately half way to the first folding part, and the first half loop is folded back by the first half loop. 1
A circular loop that extends around the inner side of the half loop to reach the second folded portion that is close to the first folded portion and a circular loop that is folded back at the second folded portion and that is approximately half the outside of the circular loop and is adjacent to the input end Since it has a special double loop structure consisting of the second half loop reaching the output end, it is equivalent to a large number of small loop antennas arranged on the circumference, and the signal does not propagate far The problem of can be solved, and the signal can be satisfactorily transmitted to the second antenna adjacent to this antenna. (B) Since only the magnetic field wave is used in this device, each antenna gets wet due to rain or the like. Even if it is used outdoors, it is not affected by the weather and various other conditions and can reliably transmit signals. (C) The first antenna is close to a metal structure, etc. Let me install Unaffected, even by transmitting a fast signal (d), generation of noise, does not occur, such as chipping of the signal becomes possible secure transmission, many effects such as can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a first antenna, which is an essential part of a signal transmission device of the present invention, FIG. 2 is a plan view thereof, and FIG.
FIG. 4 is a conceptual diagram showing the relationship between the first and second systems and the first and second antennas, FIG. 4 is an equivalent diagram of the first antenna shown in FIG. 2, and FIG. 5 is the first antenna. A perspective view of the second embodiment of
6 to 8 are perspective views showing a usage example of the first embodiment, and FIG. 9 is a perspective view showing a usage example of the second embodiment. 1 ... Rotation center, 2 ... First system, 3 ... First antenna, 3a ... Input end, 3b ... First folded portion, 3c ... First half loop, 3d ... Second 3e ... Circular loop, 3f ... Output end, 3g ... Second half loop, 4 ... Second system, 5 ... Second antenna.

Claims (1)

[Claims] 1. A first system and a second system, wherein a first antenna and a second antenna are installed opposite to each other in a relatively rotating first system and second system, and a signal is transmitted between the mutual antennas. In the first and second inter-system signal transmission devices, the first antenna has an input end on an arc substantially concentric with a rotation center so that the first antenna is coupled to the loop-shaped second antenna only by a magnetic field wave. From the first half loop extending from the first folding portion to the first folding portion at a position that divides the arc substantially into two, and a second folding portion that is folded back around the first folding portion and is close to the first folding portion. A first loop signal and a second loop signal which are looped back to each other and a second half loop looped back by the second loopback section to reach an output end adjacent to the input end. Transmission equipment.