JPH09100681A - Electromagnetic shielding door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight electromagnetic shielding door with good shielding performance and constructing property at low cost. SOLUTION: A conductive door frame 2 is provided on an entrance opening part 11 provided in a prescribed position of an electromagnetic shielding room 10, and an electromagnetic shielding door 1 formed by covering a lightweight core material with a metal foil is arranged on the door frame 2. The electromagnetic shielding door 1 is arranged in such a manner that the vertical axial line of the electromagnetic shielding door 1 is inclined to the inside of the electromagnetic shielding room 10 to the vertical direction, and one vertical edge part of the electromagnetic shielding door 1 is mounted on the door frame 2 through a hinge 4 in such a manner as to be openable and closable, whereby the electromagnetic shielding door 1 is pushed onto the door frame 2 side in the closed state of the electromagnetic shielding door 1, and a reinforcing member 7 on the peripheral end part of the electromagnetic shielding door 1 is closely fitted to the protruding part 2a of the door frame 2 to ensure the conductivity between the both. The door frame 2 is electrically connected to a wall part 12 (electromagnetic shielding specification) on the circumference of the door frame 2 to ensure the conductivity between the door frame 2 and the wall part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shield door used in an electromagnetic shield room.

[0002]

2. Description of the Related Art Usually, a magnetic resonance diagnostic apparatus (hereinafter referred to as M
In order to prevent the leakage magnetic field from the MRI from leaking outside, the room in which the MRI is installed is defined as an electromagnetically shielded room that is electromagnetically shielded with a metal plate or the like. The door for the electromagnetic shield room provided in the electromagnetic shield room for shielding the leakage magnetic field forms a strong skeleton to secure the shielding performance of the electromagnetic waves generated from MRI, and the surface is covered with a metal plate, In order to improve the electrical conductivity and adhesion between the door frame and the door, we have installed a powerful Gremon-type door opening and closing device,
The door and door frame are firmly attached to each other to prevent electromagnetic wave leakage.

[0003]

The door having the above-mentioned Glemon type door opening / closing device has a high shielding property, but has a problem that the workability is poor due to its heavy weight, resulting in a high cost. There is also a problem that it takes time to open and close. Therefore, an object of the electromagnetic shield door of the present invention is to provide an electromagnetic shield door that is lightweight, has good shielding performance and workability, and is inexpensive.

[0004]

SUMMARY OF THE INVENTION An electromagnetic shield door of the present invention solves the above problems and is an electromagnetic shield door used in an electromagnetic shield room, which is an opening provided at a predetermined position in the electromagnetic shield room. In addition to installing a conductive door frame on the inside, an electromagnetic shield door in which a lightweight core material is covered with metal foil is placed on the door frame.The electromagnetic shield door has its vertical axis inside the electromagnetic shield room with respect to the vertical direction. Or, while tilting outward, one side of the electromagnetic shield door in the up-down direction is attached to the door frame via a hinge, which is lightweight and has good shielding performance and workability. did. The electromagnetic shield door includes a lightweight core material, a conductive reinforcing material provided around the lightweight core material, a metal foil electrically connected to the reinforcing material and covering the lightweight core material, and a surface covering the metal foil. The above object can be achieved by using a decorative material.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an electromagnetic shield door of the present invention will be described with reference to FIGS. The electromagnetic shield door provided in the electromagnetic shield room is the electromagnetic shield room 1.
An electrically conductive door frame 2 is provided at an entrance opening 11 provided at a predetermined position of 0, and an electromagnetic shield door 1 in which a light-weight core material 5 described later is covered with a metal foil 6 is arranged. . The electromagnetic shield door 1 has an electromagnetic shield room 1 whose vertical axis is perpendicular to the electromagnetic shield door 1.
The side of the electromagnetic shield door 1 in the vertical direction is inclined to the inside of the door frame 2 via the hinge 4 and the door frame 2
It is attached so that it can be opened and closed. The door frame 2 is electrically connected to the wall portion 12 (electromagnetic shield specification) around the door frame 2 to ensure conductivity between the door frame 2 and the wall portion 12.

Specifically, in a state where the vertical axis of the electromagnetic shield door 1 is inclined to the inside of the electromagnetic shield room 10, one side of the electromagnetic shield door 1 and the door frame 2 in the vertical direction is inclined. The electromagnetic shield door 1 is attached to the door frame 2 through the two hinges 4 provided at the positions opposite to each other in the vertical direction of the electromagnetic shield door 1
It is installed so as to open to the outside of 0, and when the electromagnetic shield door 1 is closed, the electromagnetic shield door 1 is pressed against the door frame 2 side by its own weight. As a result, the electromagnetic shield door 1 and the door frame 2 can be brought into close contact with each other, and the conductivity between the electromagnetic shield door 1, the door frame 2 and the wall portion 12 of the electromagnetic shield room 10 can be secured. . When the electromagnetic shield door 1 is designed to open inside the electromagnetic shield room 10, the electromagnetic shield door 1 is tilted so that its vertical axis is inclined to the outside of the electromagnetic shield room 10.

The electromagnetic shield door 1 is, as shown in FIG.
For example, the entire surface of a lightweight core material 5 formed of a metal honeycomb structure member in a substantially rectangular shape is covered with a metal foil 6.
The outer periphery of the lightweight core material 5 covered with is reinforced with a reinforcing material 7 formed of a conductive member such as aluminum, and the surface decorative material 8 is formed so as to cover the exposed portion of the metal foil 6.
Is provided, the shielding performance of the door itself is good, the conductivity with the door frame 2 is good, and the structure is lightweight and has good workability. The light-weight core material 5 may be formed of a material that can reduce the weight. For example, the light-weight core material 5 may be formed of wood or a plastic plate in a substantially rectangular shape, or the plastic may be used to form the honeycomb structure member. Is also possible.

Metal foil 6 covering the surface of the lightweight core material 5
Is formed into a sheet shape by stacking a plurality of substantially rectangular metal foil pieces so that their end portions are overlapped with each other, and is attached to the surface of the lightweight core material 5. In addition, the overlapping portion of each metal foil piece may be joined with a metal foil solder plating tape, or may be joined with a conductive adhesive in which a conductive filler is mixed in a resin-based binder so that there is no gap. Bonded to improve the shield performance. Also,
You may make it join by soldering each metal foil side. The metal foil 6 may be made of electrolytic copper foil, aluminum foil, electrolytic iron foil, or the like having high shielding performance. When the above materials are used, as shown in FIG.
If it is an electromagnetic wave with a frequency up to several tens of MHz, it has a shielding performance (dB) equivalent to that of a zinc iron plate. Electromagnetic iron foil and electrolytic copper foil exhibit shielding performance equivalent to that of zinc iron plate for electromagnetic waves of approximately 80 MHz to 1 GHz, and electrolytic copper foil and electrolytic copper foil should be used for metal foil 6 in high frequency bands. It can be seen that the result is a door for electromagnetic shielding with high shielding performance. (The graph of FIG. 3 shows that the electrolytic copper foil 0.030 mm, the aluminum foil 0.035 mm,
It was measured with an electrolytic iron foil of 0.030 mm and a zinc iron plate of 0.4 mm. )

Reinforcing material 7 provided on the outer periphery of the lightweight core material 5.
Is, for example, formed in a substantially U-shaped cross section, and is attached so as to be fitted to the outer peripheral end portion of the lightweight core material 5 covered with the metal foil 6 to reinforce the lightweight core material 5, and the metal foil 6 and the reinforcing material 7 And the projection 2a of the door frame 2 which will be described later.
It is possible to secure conductivity with. The reinforcing member 7 is not limited to the substantially U-shaped cross section, but may be formed by combining rectangular rod-shaped members into a substantially rectangular shape so as to be locked to the outer peripheral portion of the lightweight core member 5. Further, the hinge 4 for attaching the electromagnetic shield door 1 to the door frame 2 is provided on one side portion of the reinforcing member 7 in the vertical direction.

The surface decorative material 8 covering the exposed portion of the metal foil 6 is, for example, a plastic plate formed in conformity with the exposed portion of the metal foil 6, and the metal foil 6 attached to the surface of the lightweight core material 5. Is designed to be protected against damage. The surface decorative material 8 is formed of conductive plastic to cover the exposed portion of the metal foil 6 and the outer peripheral portion of the surface decorative material 8 is locked to the reinforcing material 7 so that the shield performance of the electromagnetic shield door 1 is improved. It is also possible to improve. In addition to the plate-shaped surface decorative material 8, a thick sheet-shaped material may be used.

The door frame 2 provided in the opening 11 of the electromagnetic shield room 10 is a frame having a substantially rectangular cross section having an opening matching the size of the electromagnetic shield door 1, and is a conductive member such as steel. And has a projection 2a for locking the electromagnetic shield door 1 on the inner peripheral side. By the way, the protrusion 2a provided on the inner circumference of the door frame 2 is inclined so that the upper portion in the vertical direction of the protrusion 2a is inclined toward the inside of the electromagnetic shield room 10 when the door frame 2 is installed in the opening 11. When the electromagnetic shield door 1 is closed, the peripheral portion of the electromagnetic shield door 1 can be secured to the protrusion 2a of the door frame 2 by the weight of the electromagnetic shield door 1 to secure the conductivity of both. You can do it. The contact portion between the electromagnetic shield door 1 and the door frame 2 may be made of, for example, a conductive resin,
It may be possible to eliminate the gap and improve the contact to secure the conductivity and the shield performance.

Electromagnetic shield door 1 constructed as described above
To provide a door in the opening 11 of the electromagnetic shield room 10 with the door frame 2, in the opening 11 of the electromagnetic shield room 10,
The door frame 2 is installed in a state in which the vertical upper portion of the protrusion 2a is tilted inward of the electromagnetic shield room 10, and the door frame 2 is electrically joined to the wall portion 12 of the electromagnetic shield room 10. . Then, the electromagnetic shield door 1 is attached to the door frame 2 via the hinge 4, and the electromagnetic shield room 10
Provide a door to. Since the electromagnetic shield door 1 has a light weight component member, the total weight of the door is lighter than the conventional one, so that a device such as a hinge for holding the door is simple, and the workability is good and the cost is low. It has become a thing.

Further, since the electromagnetic shield door 1 has its vertical axis inclined to the inside of the electromagnetic shield room 10 with respect to the vertical direction, the weight vector of the electromagnetic shield door 1 is different from that of the door in the axial direction. The electromagnetic shield door 1 is disassembled in the direction perpendicular to the axis, and as a result, the electromagnetic shield door 1 is pressed against the inside of the electromagnetic shield room 10, and when the electromagnetic shield door 1 is closed, the electromagnetic shield door 1 comes into close contact with the protrusion 2a of the door frame 2. Therefore, the electrical conductivity between the two is ensured, and the adhesion between the door and the door frame is good and the leakage of electromagnetic waves is small without using a special device. Further, when the electromagnetic shield door 1 is closed, the wall portion 12, the door frame 2, and the electromagnetic shield door 1 are ensured to have conductivity, and as a result, the electromagnetic shield effect of the electromagnetic shield room 10 can be maintained. There is.

By inclining the vertical axis of the electromagnetic shield door 1 by 5 degrees with respect to the vertical direction, the electromagnetic shield door 1 is moved to the door frame 2 with a force of about 0.087 times the door weight (= sin 5 °). Can be pressed against. Assuming that the total weight of the electromagnetic shield door 1 is 50 kg, when the electromagnetic shield door 1 is tilted 5 degrees from the vertical direction, the force pressing the electromagnetic shield door 1 toward the door frame 2 is 4.35 kg (50 k
g × 0.087), which is an appropriate force for pressing the electromagnetic shield door 1 against the door frame 2. By the way, when the electromagnetic shield door 1 is opened, an equal force is applied to open the electromagnetic shield door 10 toward the outside of the electromagnetic shield room 10. The electromagnetic shield door 1 of the present invention can be used as a door for a room in which an MIR is installed or a room such as a computer room that requires electromagnetic wave shielding.

[0015]

The electromagnetic shield door of the present invention can be reduced in weight by reducing the weight of the door by using a metal foil as the electromagnetic shield material. In addition, the electromagnetic shield door is attached to the door frame with its vertical axis tilted inward or outward of the electromagnetic shield room with respect to the vertical direction, so when closing the door, By pressing the door against the door frame side by using the component force perpendicular to the plane, the contact pressure between the door and the door frame is increased and brought into close contact, and the contact pressure is increased to ensure the conductivity between the door and the door frame. It This eliminates the need for a gremon device or the like for pressing the door against the door frame, and when securing intermediate-level electromagnetic shielding performance, materials such as finger contacts are also unnecessary for the contact portion between the door and the door frame, It is an electromagnetic shield door with good workability, low cost, and good shield performance. Also, by calculating and adjusting the angles of the door and the door frame, the force required to open and close the door can be obtained, and the door can be opened and closed easily. The door will close naturally.

[Brief description of the drawings]

FIG. 1 is a perspective view (a) and a sectional view (b) showing an installation state of an electromagnetic shield door of the present invention.

FIG. 2 is a cross-sectional explanatory view of an electromagnetic shield door.

FIG. 3 is a graph showing an example of measurement of electromagnetic shielding performance of metal foil.

[Explanation of symbols]

 1 Electromagnetic shield door 2 Door frame 5 Light weight core material 6 Metal foil 7 Reinforcing material 8 Surface decorative material 10 Electromagnetic shield room

Claims (2)

[Claims] 1. An electromagnetically shielded door used in an electromagnetically shielded room, wherein a conductive door frame is installed at an opening provided at a predetermined position of the electromagnetically shielded room, and the door frame is made of a lightweight core material. The electromagnetic shield door is covered with a metal foil, and the electromagnetic shield door has a vertical axis that is tilted toward the inside or outside of the electromagnetic shield room with respect to the vertical direction. An electromagnetic shield door, characterized in that one side part of the is attached to the door frame via a hinge. 2. The electromagnetic shield door comprises a lightweight core material, a conductive reinforcing material provided around the lightweight core material, and a metal foil electrically connected to the reinforcing material and covering the lightweight core material. The electromagnetic shield door according to claim 1, which is composed of a surface decorative material that covers the metal foil.