JPH058526Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a turntable installed in a ground plane used in a facility for measuring radiated disturbance waves, and particularly to its grounding structure.

<Prior art> Generally speaking, facilities for measuring radiated disturbance waves such as electromagnetic waves are equipped with a base plate 3 made of steel installed on the ground with a discontinuous structure on the top surface, as shown in Figures 4 and 5. A rectangular ground plane 2 is formed by laying flat steel materials with no steps or undulations. A disk 5 made of a metal material with a diameter smaller than the diameter of a circular hole cut out in a part of the ground plane 2 is embedded so that the upper surface thereof is flush with the surface of the ground plane 2. The turntable 1 is constructed by being welded or screwed onto a circular rotary table 4 with their axes aligned. Here, the ground plane 2 is stationary, and the metal disk 5 rotates in a 360° direction with the rotation of the turntable 1, which is a rotary table 4 provided on the base plate 3, and emits radiation interference electromagnetic waves in all directions. was captured and measured. Note that 10 indicates a dome on the ground plane 2.

<Problems to be solved by the invention> In the conventional turntable 1 for measuring radiation disturbances, the gap 8 between the rotating disk 5 fixed to the surface thereof and the stationary ground plane 2 is electrically Since it is insulated, the disc 5 on the turntable 1 enters a unique electrical resonance state, which has the drawback of causing disturbances in the amount of site attenuation. Also turntable 1
Since the potentials of the turntable 1 and the ground plane 2 are different in terms of high frequency, there is a drawback that the turntable 1 and the ground plane 2 may come into unstable contact with each other, and noise may be generated between them due to spark discharge.

<Means for Solving the Problems> The present invention eliminates the drawbacks of the conventional method and provides a plurality of sliding contacts 9 disposed in a ring shape along a circular hole 7 cut through a ground plane 2 that is grounded. is provided so that the gap 8 created between the ground plane 2 and the metal disk 5 is electrically contacted.

<Function> The ground plane 2 and the disc 5 of the turntable 1 are electrically connected by a sliding contact piece 8, and each contact piece rotates by sliding with another metal material while maintaining an equal potential. move.

<Example> An example of the embedded turntable for measuring radiation disturbance according to the present invention is shown in FIG. As shown in the figure, a metal disk 5 is attached to the top surface of a rotating table 4, which is mounted on a base plate 3 with a rotating shaft 6 and rotated slowly by a motor (not shown), with the same axis. Then, the turntable 1 is formed.

The disk 5 is cut out on the ground plane 2 of approximately the same thickness, and has a hole 7 having a diameter larger than the diameter of the disk 5.
It is buried with a gap 8 between.

As shown in FIG. 2, there are contact pieces 9 made of a plurality of metal materials, one of which is fixed to the lower surface of the ground plane 2 and the other is slidable in contact with the lower surface of the disk 5, bridging the gap 8. It is provided. Therefore, the disc 5 can rotate together with the turntable 1 while being kept at the same electrical potential as the ground plane 2 by the contact piece 9. Regardless of the diameter of the disc 5, if the distance between the contact pieces 9 is 300 mm or less, the potential between the ground plane 2 and the turntable 1 can be stably maintained at the same high frequency. FIG. 3 shows another embodiment in which a contact piece 9' is fixed to a disk, in which a contact piece 9' having a D-shaped cross section is provided on the outer peripheral surface of the disk 5, and its contact surface is on the ground plane 2. It is provided so as to come into elastic contact with the inner surface of the cutout hole. In this contact piece 9', if the lower surface of the outer periphery of the disc 5 is chamfered so that the disc 5 can be smoothly attached and removed, it can also serve as a buffer against the vibration of the turntable 1. Therefore, compared to the case of FIG. 2 in which the contact piece 9 is provided on the lower surface of the turntable or the ground plane 2, smooth operation is possible even when the thickness of the disc 5 and the ground plane 2 are different.

<Effects of the invention> As described above, according to the invention, the turntable 1 and the ground plane 2 are kept at the same potential, and disturbances in site attenuation caused by the turntable 1 can be reduced. Also, the holes cut out in the ground plane 1 and the finishing of the disk 5,
Machining accuracy can be increased compared to conventional turntables.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view of a part of an embodiment of the embedded turntable for measuring radiation disturbance according to the present invention, Fig. 2 is an enlarged vertical sectional front view of part A of the gap in Fig. 1, and Fig. 3 is the inventive embodiment. Fig. 4 is a schematic plan view of a radiation disturbance measurement facility generally used for measurements, and Fig. 5 is a vertical cross-sectional front view of a conventional embedded turntable. It is a diagram. In addition, 1...turntable, 2...ground plane, 3...foundation board, 4...rotating table, 5...
...Disk, 6... Rotating shaft, 7... Hole, 8... Gap,
9,9'...Contact piece.

Claims (1)

[Scope of utility model registration request] The surface of the ground plane 2 made of metal material is cut out into a circular shape, and a metal disk 5 with a diameter smaller than the diameter of this circular shape is cut out.
is fixed to a rotating metal turntable with its upper surface on the same level as the upper surface of the ground plane 2, and the gap between the ground plane 2 and the metal disk 5 is An embedded turntable for radiated disturbance measurement bridged by a sliding contact.