Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-06-10
2001-02-27
Gandhi, Jayprakash N. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S825000, C361S818000, C174S034000, C333S012000
Reexamination Certificate
active
06195269
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a noise suppressing apparatus which blocks the leakage of electromagnetic noise generated from a plate-shaped noise generating component, such as a flexible printed circuit board (FPC) or a flat cable (FC).
2. Description of the Related Art
In an electronic equipment, such as a computer, a plate-shaped noise generating component, such as a flexible printed circuit board (hereafter FPC) or a flat cable (hereafter FC) is generally disposed, and the plate-shaped noise generating component may generate strong electromagnetic noise locally by the influence of signals passing through it.
If the electromagnetic noise is locally generated from a plate-shaped noise generating component, the leakage of the electromagnetic noise may cause malfunctions to other electronic devices disposed around the noise generating component.
To prevent leakage of electromagnetic noise generated from such a plate-shaped noise generating component as FPC or FC, a part where the electromagnetic noise is generated is covered with a noise suppressing apparatus, which reduces the influence of electromagnetic noise leaked from the plate-shaped noise generating component as much as possible.
This conventional noise suppressing apparatus is constituted by an integratedly molded ferrite of rectangular shape in which a hole to insert the plate-shaped FPC or FC is formed.
To mount the noise suppressing apparatus onto a plate-shaped noise generating component such as FPC or FC, it is necessary first to insert the FPC or FC into the hole of the noise suppressing apparatus before the FPC or FC is assembled into the electronic equipment, position the noise suppressing apparatus at a part of the FPC or FC, and connect the FPC or FC on which the noise suppressing apparatus has been mounted to a terminal such as a connector.
With the conventional noise suppressing apparatus constituted by integratedly molded ferrite, however, the noise suppressing apparatus must be attached to a part of the FPC or FC where an electromagnetic noise is leaking before connecting the FPC or FC to the terminal such as a connector. Therefore, if it is found that electromagnetic noise is leaking another part of the FPC or FC after connecting the FPC or FC to the terminal, it is necessary that the FPC or FC is detached from the terminal, and then the noise suppressing apparatus is attached to this another part of the FPC or FC where electromagnetic noise is actually leaking, and the FPC or FC is connected to the terminal again. Thus, the conventional apparatus has a problem in that the operation to attach the noise suppressing apparatus at a different part of the FPC or FC after connecting the FPC or FC to the terminal is extremely troublesome.
Further, for the conventional noise suppressing apparatus constituted by integratedly molded ferrite, it is difficult to manufacture a thin rectangular ferrite having a hole inside by the ferrite molding process. As a consequence, it is impossible to mount the conventional noise suppressing apparatus in a small space of slim electronic equipment, such as a notebook personal computer.
SUMMARY OF THE INVENTION
With the foregoing in view, it is an object of the present invention to provide a noise suppressing apparatus having a small thickness, and capable of being easily attached to a plate-shaped noise generating component.
To solve the above problems, a noise suppressing apparatus according to the present invention, which covers top and bottom faces of a plate-shaped noise generating component so as to prevent leakage of electromagnetic noise generated from the noise generating component, comprises a pair of case plates on a surface of which a ferrite plate is secured respectively; and latching means for engaging and locking the pair of case plates in a position where the ferrite plate of each of the pair of case plates are facing each other, wherein the pair of case plates are disposed on top and bottom faces of the noise generating component, the pair of case plates are latched by the latching means to cover a part of the top and bottom faces of the noise generating component with the ferrite plate secured to each of the case plate, so that the leakage of electromagnetic noise generated from the covered part is prevented.
REFERENCES:
patent: 5095296 (1992-03-01), Parker
patent: 5351017 (1994-09-01), Yano et al.
patent: 5709249 (1998-01-01), Okada et al.
Diller, Ramik & Wight PC
Gandhi Jayprakash N.
I-Pex Co., LTD
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