JPH04106773U - Grounding structure of turntable for electromagnetic wave measurement - Google Patents

Abstract

(57) [Summary] [Purpose] To ground the turntable stably for a long period of time. [Structure] A ring-shaped grounding fitting 21 is attached to the inner circumferential surface of the outer peripheral reinforcing rib 16a of the turntable 12 using an L fitting 22, and a ball bearing 23c is rotatably connected to the bottom surface of the grounding fitting 21. , ball bearing 2
3c is held by the arm 23b, and the arm 23b is rotatably held by the support body 23a, and the ball bearing 23c is pressed against the grounding metal fitting 21 by the conductive spring piece 23d, and is connected to the ground plane 11 through the conductive spring piece 23d. Grounded.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea involves rotating the electronic device under test and emitting radiation from the electronic device under test. A metal turntable used to measure electromagnetic waves is placed on the ground plane. Regarding the grounding structure for grounding.

0002

[Conventional technology]

Measurement of whether the interference radio waves emitted by electronic equipment to the outside are within the standard, and antenna In order to measure the directivity of the A turntable 12 made of metal is rotatably provided, and on the turntable 12 An electronic device to be measured 13 is mounted, and an antenna 14 is provided on the ground plane 11. The antenna 14 receives the electromagnetic waves radiated from the electronic device under test 13 and records the electromagnetic waves. Measure the bell. By performing the above measurement while rotating the turntable 12, It is possible to measure electromagnetic waves emitted from each direction of the electronic device under test 13. .

0003 In this case, each part of the turntable 12 must be at the same potential as the ground plane 11. , the electromagnetic waves radiated from the electronic device under test 13 are re-radiated from the turntable 12. This prevents correct measurements. For this reason, the turntable 12 is connected to the ground plane 1. 1, it is grounded using the grounding structure shown in Fig. 4. The electronic device to be measured 13 placed on the turntable 12 weighs several hundred kilograms, for example. Some of them are heavy. For this reason, the bottom surface of the turntable 12 is provided with radial and circumferential directions. The reinforcing ribs 16 near the outer edge of the turntable 12 are fixed. a is made particularly thick, and a load-bearing bearing is provided on the bottom surface of this outer periphery reinforcing rib 16a. The load of the turntable 12 is fixed through the bearing 17 by rotating the bearing 17. It is designed to be received by regular people. The entire turntable 12 and its rotating shaft is The outer periphery of the turntable 12 should be I want to ground the part. In addition, the rib 16, the load receiving bearing 17, and its holding mechanism are also included. The bottom surface of the outer periphery reinforcing rib 16a is installed as a grounding mechanism in order to prevent it from getting in the way. The turntable 12 is grounded by electrically connecting it to the ground plane 11 through the turntable 18. . As the grounding mechanism 18, for example, one end of the contact piece 18a made of a metal spring material is attached to the rib 16. a, the other end is fixed to the metal support 18b, and the metal support 18b is fixed to the ground plane 11.

0004

[Problem that the idea aims to solve]

While the rotation of the turntable 12 is repeated, the load receiving bearing 17 and the ribs 16a are in contact with each other with strong force and are shifted from each other, causing the bottom surface of the ribs 16a to The surface of the turntable 1 becomes rough and the grounding mechanism 18 comes into contact with the rough surface. 2 and the grounding mechanism 18 becomes poor, resulting in a stable connection of the turntable 12. The land becomes hopeless.

[0005] Note that if the grounding mechanism 18 is brought into contact with the outer peripheral surface of the rib 16a, the contact surface will be smooth. Although there is no problem with the deterioration of the power, it is usually grounded at 4 to 8 points to ensure grounding. Since the turntable drive mechanism is in contact with elastic pressure, it is easy to repair and inspect the turntable drive mechanism. Therefore, if the turntable 12 is removed, the subsequent turntable installation work will be significantly complicated. It becomes difficult to manage.

[0006]

[Means to solve the problem]

According to the invention of claim 1, a ring concentric with the outer periphery of the turntable is provided near the outer periphery of the turntable. A ring-shaped grounding metal fitting is installed and electrically integrated, and the grounding metal fitting is electrically integrated. A grounding mechanism is brought into contact with the bottom surface of the tool and is grounded to the ground surface. According to the invention of claim 2, on the lower side of the turntable, near the outer periphery thereof. A ring-shaped grounding fitting is provided concentrically with this, and this grounding fitting connects the ground plane and the electrical The grounding mechanism connected to the turntable and in contact with the top surface of this grounding fitting is attached and electrically connected.

[0007]

【Example】 FIG. 1 shows an embodiment of the invention of claim 1. near the outer periphery of the turntable 12 , a ring-shaped grounding fitting 21 concentric with this is attached, and the turntable is It is electrically connected to 12. For example, close to the inner peripheral surface of the outer peripheral reinforcing rib 16a, A ring-shaped grounding fitting 21 is arranged concentrically with this, and on top of this grounding fitting 21, The surface and the inner peripheral surface of the outer peripheral reinforcing rib 16a are fixed to each other by an L fitting 22. Ground only Although the fitting 21 is not shown in the figure, it is used for the load receiving bearing 17 and its holding part. Do not place it much below the rib 16a so as not to get in the way. For example, the L fitting 22 can be The ground fitting 21 is fixed by welding, and the rib 16a is fixed by screws. determined. The grounding metal fitting 21 is preferably made of stainless steel from the point of view of rust prevention. It is preferable to use a plate ring-shaped body whose bottom surface is as flat as possible.

[0008] A grounding mechanism 23 is provided which is in contact with the bottom surface of the grounding-only metal fitting 21, and this grounding mechanism 2 3, the grounding metal fitting 21 is grounded (electrically connected) to the ground plane 11. ground In this example, the mechanism 23 is fixed to the ground plane 11 and electrically connected to support it. A support body 23a is provided, an arm 23b is rotatably attached to the support body 23a, A ball bearing 23c is rotatably attached to the end of the arm 23b. The outer peripheral surface of the outer ring of the ball bearing 23c is in rolling contact with the bottom surface of the grounding fitting 21, and the One end of the electric spring piece 23d is fixed to the support body 23a, and the other end is a ball bearing. The ball bearing 23c is pressed against the outer peripheral surface of the outer ring of the grounding metal fitting 2. 1.

[0009] The turntable 12 includes a rib 16a, an L fitting 22, a grounding fitting 21, and a ball base. Electrically connected to the ground plane 11 through the ring 23c, the spring piece 23d, and the support 23a. connected and grounded. A load receiving bearing is in contact with the grounding metal fitting 21. Therefore, the bottom surface of the grounding fitting 21 will not be rubbed strongly and will remain smooth. and good electrical contact with the grounding mechanism 23 is maintained over a long period of time.

0010 As the grounding mechanism 23, one similar to the conventional one shown in Fig. 4 or another one may be used. It's okay. Also, the grounding metal fitting 21 may be attached near the outer peripheral surface of the rib 16a. . FIG. 2 shows an embodiment of the invention of claim 2, and parts corresponding to those in FIGS. 1 and 4 have the same reference numerals. is attached. In this example, a rib is placed slightly outside just below the outer periphery reinforcing rib 16a. A ring-shaped grounding fitting 24 is disposed concentrically with the grounding fitting 16a. It is a plate-shaped ring that is free of pressure, and is supported by a metal support piece 25 against the ground plane 11. Both are electrically connected. The upper surface of the grounding fitting 24 is a smooth surface. grounding gold When the grounding mechanism 26 in contact with the top surface of the tool 24 is attached to the turntable 12, electrically connected to. In this example, one of the conductive spring pieces 26d is used as the grounding mechanism 26. The end portion is pressed into contact with the upper surface of the grounding fitting 24, and the L fitting 26b is connected to the outer periphery of the rib 16a. The other end of the conductive spring piece 26a is fixed to the L fitting 26b.

[0011] The turntable 12 has a rib 16a, an L fitting 26b, a conductive spring piece 26a, and a ground It is electrically connected to the ground plane 11 through the metal fitting 24 and the support piece 25 and is grounded. As the grounding mechanism 26, one similar to that shown in Fig. 1 or other types may be used. good. When holding the load receiving bearing 17 outside the turntable 12, , the grounding fitting 24 is placed inside the rib 16a.

0012

[Effect of the idea]

As mentioned above, according to this invention, a grounding metal fitting used only for grounding 21 or 24 and the grounding mechanism 23 or 26 to ground the turntable 12. Because of this, the contact surface between the grounding mechanism and the grounding metal fittings may become rough even after long-term use. Good electrical contact can be obtained without the risk of the turntable 12 being grounded stably. will be held. Since the grounding fitting 21 or 24 can be made of a thin material, it is not necessary to use an expensive stem. Even if you use something that doesn't rust easily, such as stainless steel, it won't be that expensive overall, and Stable grounding can be achieved. You can also use this to install a turntable. The grounding structure is unobtrusive.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a part of an embodiment of the invention according to claim 1;

FIG. 2 is a partially cutaway perspective view showing a part of an embodiment of the invention according to claim 2;

FIG. 3 is a diagram showing the configuration of electromagnetic wave measurement of a device using a turntable.

FIG. 4 is a partially cutaway perspective view showing a part of a conventional turntable grounding structure.

Claims (2)

[Scope of utility model registration request] [Claim 1] A ring-shaped grounding fitting that is installed near the outer periphery of the turntable and electrically integrated therewith, and that is concentric with the turntable, and that is in electrical contact with the bottom surface of the grounding fitting. A grounding structure for a turntable for electromagnetic wave measurement, comprising: a grounding mechanism for grounding the turntable to a ground surface; 2. A ring-shaped grounding fitting provided on the underside of the turntable near its outer periphery, electrically connected to the ground plane, and concentric with the turntable; A grounding structure for a turntable for electromagnetic wave measurement, comprising a grounding mechanism that is in electrical contact with, is electrically connected to, and is attached to the turntable.