JPH0710559Y2 - Electrical equipment housing panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a housing panel of an electric device which constitutes a housing of an electronic copying machine, a computer, a digital exchange, peripherals thereof and the like.

[Prior Art] Conventionally, the housings of various electric devices are made of a metal plate because it is necessary to shield electromagnetic waves generated from the internal devices thereof and because high strength and rigidity are required. In order to further promote the reduction in size and weight of electric devices, there is a great demand for reducing the weight of housings, and the fact is that plasticization is progressing.

However, in order to plasticize the housing of this type of electric device, it is general that a thermoplastic resin is injection-molded to form a single-walled housing panel, and then the housing panel is used to assemble the housing. .

In order to provide the housing with an electromagnetic wave shielding property, an electromagnetic wave shielding film is formed on the back surface of the housing panel constituting the housing by painting or plating.

[Problems to be solved by the invention] However, in the case where the electromagnetic wave shielding coating is formed on the back surface of the injection-molded single-walled housing panel by coating or the like, the housing panel receives external vibration or shock,
Alternatively, there is a drawback in that the coating film is partially peeled off by stimulation due to a change in temperature and the like, and it progresses in a short period of time, and the electromagnetic wave shielding coating film largely disappears. Moreover, in order to apply the electromagnetic wave shielding coating on the back surface of the panel by painting or plating, many manufacturing steps must be performed, which is a problem in manufacturing.

Also, in the case where the panel has a ventilation port, there is a contradictory relationship between the size of the ventilation port opening and the fact that the electromagnetic shielding property of that part is not impaired and that the required ventilation volume is secured. In the case of a housing panel in which the entire structure including the mouth structure is made plastic, and in which a large amount of ventilation must be ensured, there is a problem that the electromagnetic wave shielding property of the ventilation part becomes insufficient.

The present invention is intended to solve the above-mentioned various problems, and the strength of the entire panel is excellent and the rigidity is excellent. (EN) Provided is a housing panel for an electric device, which has an electromagnetic wave shielding property, can adhere a porous sheet together with a panel, and can be easily attached and detached when removing dust adhering to the porous sheet and can easily replace the porous sheet. is there.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following configuration.

That is, a housing in which a peripheral portion of a front wall and a back wall made of the same thermoplastic is welded to form a hollow portion that separates the front wall and the back wall independently from each other, and a ventilation port is formed in a part thereof. On the back side of the panel, which is a panel with a ventilation port,
A housing panel for an electric device, characterized in that a porous sheet that shields electromagnetic waves is laminated over the entire back surface of the panel so as to block the ventilation port, and the porous sheet is fixed at the peripheral portion of the panel. is there.

[Operation] In the housing panel of the electric device according to the present invention,
The front and back walls made of the same thermoplastic are welded together to form a hollow part that separates the front and back walls from each other independently. It has a wall structure and has high strength and rigidity as a whole. Furthermore, since a porous sheet that shields electromagnetic waves is laminated on the entire back surface of the panel so as to block the ventilation opening, a perfect electromagnetic shielding property can be obtained regardless of the size of the opening of the ventilation opening. Therefore, it is possible to obtain a housing panel that can secure a sufficient ventilation without impairing the electromagnetic wave shielding property.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an electronic copying machine 1 as an example, and 2 is a housing panel that constitutes the front surface of the housing.

FIG. 2 shows the detailed structure of the housing panel 2. The housing panel 2 comprises a front wall 3 and a back wall 4 made of the same thermoplastic material. By welding the peripheral edge portion 5 of the wall 4, the front wall 3 and the back wall 4
The hollow portion 6 is formed by independently separating and. A front wall 3 and a back wall 4 are provided below the housing panel 2.
A ventilation port 7 is formed by forming an opening on the periphery and welding the front wall 3 and the back wall 4 around the periphery to close the hollow portion 6, and the grill 8 is fitted from the front wall 3 side of the ventilation port 7. Has been. On the back surface of the back wall 4 of the housing panel 2, a porous sheet 9 having an electromagnetic wave shielding property is laminated over the entire surface, and the ventilation port 7 is blocked by this porous sheet 9. Bolt holes 10 are formed at appropriate intervals all around the periphery of the housing panel 2, and bolt holes 11 corresponding to the bolt holes 10 are also provided in the peripheral frame portion of the perforated sheet 9. A recess 12 is formed on the front side of the bolt hole 10. And
The housing panel 2 is fixedly mounted on the frame 14 of the electronic copying machine 1 by inserting the bolt 13 into the bolt hole 10. When the housing panel 2 is fixedly mounted, it is attached via a reinforcing edge member 15 such as a plastic sheet laminated on the outer periphery of the perforated sheet 9, and the perforated sheet 9 is electrically connected to a frame 14 such as a metal. . Then, the porous sheet 9 is grounded via the frame 14.

As the thermoplastic resin forming the housing panel 2, styrene-modified polyphenylene oxide, polypropylene, polyethylene, polyamide, ABS resin, vinyl chloride, or the like suitable for blow molding is used. Further, the porous sheet 9 having an electromagnetic wave shielding property is made of a material such as a metal fiber net or a carbon fiber nonwoven fabric, which has an excellent electromagnetic wave shielding property and does not hinder the flow of air.

In the housing panel 2 configured as described above, the front wall 3 and the back wall 4 are both made of the same thermoplastic, and the front wall 3 and the back wall 4 are separated from each other independently. Since the hollow portion 6 is formed, it is light in weight, and the entire panel has uniform properties and high rigidity. Further, the back surface of the back wall 4 has a porous sheet 9 having an electromagnetic wave shielding property over the entire surface.
Is laminated and the ventilation port 7 is blocked by the perforated sheet, the electromagnetic wave shielding property of that part is perfect regardless of the size of the opening of the ventilation port 7, and the ventilation port 7 is particularly large. It has an excellent electromagnetic wave shielding property for devices that generate electromagnetic waves with short wavelengths inside the housing. Moreover, since the perforated sheet 9 can be fixed together with the housing panel 2, it is possible to easily attach and detach the dust adhering to the perforated sheet 9 and replace the perforated sheet 9.

The housing panel 2 is formed by blow molding, but since the porous sheet 9 is laminated on the back surface of the back wall 4, the manufacturing process is simple. Since the housing panel 2 has a great durability, it is possible to construct a housing in which the electromagnetic wave shielding property is not impaired for a long period of time.

[Effects of the Invention] The present invention forms a hollow portion in which the front wall and the back wall, which are made of the same thermoplastic material, are welded to each other and the front wall and the back wall are independently separated from each other, and a part is ventilated. It is a housing panel formed with a mouth, and on the back surface of the panel provided with the ventilation port,
Since it is composed by laminating a perforated sheet that shields electromagnetic waves so as to block the ventilation port, the strength of the entire panel is high and the rigidity is excellent, especially regardless of the size of the opening of the ventilation port. In addition to being able to completely shield electromagnetic waves, the porous sheet can be fixed together with the panel, and
It is possible to obtain a housing panel of an electric device that can be easily attached and detached when removing dust adhering to the perforated sheet and exchange of the perforated sheet.

[Brief description of drawings]

FIG. 1 is an overall perspective view of an electronic copying machine having a housing panel according to the present invention as a front panel, and FIG. 2 is a vertical cross-sectional side view showing details of the structure of the housing panel. 1 ... Electronic copying machine, 2 ... Housing panel, 3 ... Front wall, 4
... back wall, 5 ... peripheral part, 6 ... hollow part, 7 ... ventilation port, 8 ... grill, 9 ... perforated sheet

Claims (1)

[Scope of utility model registration request] 1. A front wall and a back wall made of the same thermoplastic resin are welded at their peripheral edges to form a hollow portion which separates the front wall and the back wall independently from each other, and a ventilation port is formed at a part thereof. A housing panel made up of the following: a perforated sheet that shields electromagnetic waves is laminated on the entire back surface of the panel on the back surface of the panel provided with a ventilation port so as to block the ventilation port, and the perforated sheet is fixed at the periphery of the panel. A housing panel for an electric device, which is configured as described above.