JPH05249163A - Anechoic chamber device - Google Patents

Abstract

PURPOSE:To use an electric wave dark room device while electric wave is shielded and the device is moving on a production line by fitting an electric wave absorber on an internal surface of a metal shield box and providing a window where an equipment to be tested passes and the cover, a hollow wire for test, a door and a wheel with a braking mechanism. CONSTITUTION:An assembly-type shield box 1 is made of metal and a door part 2 to be removed is utilized for mounting an electric wave absorber 3 into the box and for maintaining it. The absorber 3 is applied to portions other than the bottom surface of the shield box 1 by using an adhesive. The bottom surface is not adhered so that a passage for a maintenance personnel can be secured. A conductive leaf spring, etc., are used for preventing an electric wave from being leaked and are fixed with screws firmly in a junction part between the door part 2 and the shield box 1. A port 4 where an object to be tested is inserted is used for installing an object to be tested in a moving-type anechoic chamber and is provided with a metal lid. An antenna 5 for test is installed opposite to the insertion part 4 and is used for sending and receiving an electric wave for test. A traveling vehicle 6 with a braking mechanism allows the moving-type anechoic chamber to be moved. A ground terminal 7 is used to connect wire for installing the moving-type anechoic chamber. With this configuration, an anechoic chamber can be moved to and placed at a desired position on a production line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an apparatus used for a test performed in a state where a transmitting / receiving section and an antenna section are connected in a manufacturing and inspection process of microwave communication equipment. In particular, it relates to the improvement of the anechoic chamber of the test facility.

[0002]

2. Description of the Related Art Conventionally, in this type of work, it is desired to use a large anechoic chamber shown in FIG. 2 so that radio waves from the antenna do not leak to the outside and are not interfered with from the outside. The communication device under test 22 and the antenna for measurement 23 were moved from the production line, carried in and installed, and then connected to the measuring instruments 24 and 25 by the cable 26 from the large anechoic chamber 21 for testing.
Then, after the test, the cable 26 was removed, and the communication device under test 22 and the antenna for measurement 23 were carried out and moved again to the production line.

[0003]

In such a conventional method of using a large anechoic chamber, it has to be carried in and out of a large anechoic chamber installed in a place independent of the production line for each test. In addition, large anechoic chambers are expensive equipment, and it is difficult to own multiple anechoic chambers. Therefore, it is often operated as a shared facility and cannot be used according to the production schedule. Furthermore, there are many drawbacks such as the setup of the test system has to be performed each time.

The present invention eliminates such drawbacks, and an object of the present invention is to provide an anechoic chamber device which can be moved and installed at a desired place on a production line.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a metallic shield box in an anechoic chamber device which constitutes a space for conducting a test by connecting a transmitting / receiving section of a microwave communication device and an antenna section. A radio wave absorber is attached to the window, a window section sufficient for taking in and out the equipment under test, a lid made of a material with a high shielding effect that covers this window section, and a test antenna installed inside the box facing this window section. And a removable door that secures an opening suitable for maintenance inside the box, and a wheel having a brake mechanism at the bottom of the box.

[0006]

Operation: The communication device under test and the measurement antenna can be moved and used on the production line in a state of being shielded from radio waves without the need to carry in and out.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of a mobile anechoic chamber. 1
Is an assembling type shield box, 2 is a detachable door section, 3 is a radio wave absorber, 4 is a DUT insertion port, 5 is a test antenna, 6 is a mobile vehicle, and 7 is a ground terminal. The prefabricated shield box 1 is metallic and has a detachable door portion 2 on one surface. The detachable door portion 2 is a door used when installing or maintaining the electromagnetic wave absorber 3 in the prefabricated shield box 1. The radio wave absorber 3 is attached with an adhesive or the like except for the bottom surface of the prefabricated shield box 1. The bottom surface is placed without adhering the electromagnetic wave absorber 3 in order to secure a passage for a person to enter during maintenance. The joint between the detachable door portion 2 and the prefabricated shield box 1 is firmly fixed with screws using a conductive leaf spring or the like so as to prevent radio waves from leaking. The DUT insertion port 4 is for installing the DUT in a mobile anechoic chamber and has a metallic lid. The test antenna 5 is installed face-to-face with the DUT insertion port 4 and transmits and receives test radio waves. The mobile vehicle 6 is for freely moving the mobile anechoic chamber,
Has a braking mechanism. The ground terminal 7 is for connecting a wiring for grounding the mobile anechoic chamber.

In this embodiment, as shown in FIG. 1, in a radio anechoic chamber device which constitutes a space for conducting a test by connecting a transmitting / receiving section of a microwave communication device and an antenna section, a metal assembly type shield box 1 The electromagnetic wave absorber 3 is mounted on the inner surface of the box, and the device under test insertion port 4 is a window portion having a lid with a material having a high shielding effect and sufficient for taking in and out the device under test.
A test antenna 5 provided in the box facing the DUT insertion port 4, a removal door section 2 for ensuring an opening suitable for maintenance inside the box, and a brake mechanism at the box bottom. And a mobile vehicle 6 having the same.

[0009]

As described above, according to the present invention, the radio wave emission test can be performed safely and easily with inexpensive equipment investment.
There is an effect that the quality and reliability of communication equipment can be guaranteed at low cost.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a structure of a conventional example.

[Explanation of symbols]

 1 Assembled shield box 2 Removal door 3 Electromagnetic wave absorber 4 DUT insertion port 5 Test antenna 6 Mobile vehicle 7 Ground terminal 21 Large anechoic chamber 22 Communication device under test 23 Measurement antenna 24, 25 Measuring instrument 26 cable

Claims (1)

[Claims] 1. An anechoic chamber device for connecting a transmitting / receiving part of a microwave communication device and an aerial part to form a space for a test, which is an assembly type shield box which is a metal shield box, and an electromagnetic wave is provided inside the box. A window, which is equipped with an absorber and is sufficient for taking in and out the device under test, a lid made of a material having a high shielding effect for covering the window, and a test antenna provided in the box facing the window, An anechoic chamber device, comprising: a removable door that secures an opening suitable for maintenance inside the box; and a wheel having a brake mechanism at the bottom of the box.