Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-06-11
2004-05-11
Martin, David (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S796000
Reexamination Certificate
active
06735088
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a circuit board protection cover and a circuit board having the circuit board protection cover and, more particularly, to the structure of a measuring/circuit adjusting opening formed in a protection cover that protects a circuit board.
A protection cover is sometimes provided to a circuit board, in accordance with the type of product to which the circuit board is to be mounted, in order to shield external dust or to prevent short-circuiting, or for the purpose of magnetic shielding. The inspection of checking whether the product functions correctly or the adjustment of an electrical circuit cannot be performed correctly unless assembly of components including the circuit board is completed. When the voltage waveform or voltage of the electrical circuit mounted on the circuit board is to be measured, measurement must be performed after removing the protection cover from the circuit board. This makes the operation cumbersome, which is not efficient.
In order to solve this, conventionally, as shown in
FIG. 4A
, a rectangular opening
221
is formed in a protection cover
220
to correspond to the position of a measurement pad
211
or circuit adjusting component
212
on a circuit board
210
which is to be measured or adjusted. As shown in
FIG. 4B
, a measurement probe
231
is inserted in the protection cover
220
through the opening
221
and is brought into contact with the measurement pad
211
or circuit adjusting component
212
, thereby performing target measurement or circuit adjustment.
With the conventional protection cover structure, the circuit board
210
communicates with the outside through the opening
221
during non-measurement as well. Hence, dust or a foreign substance tends to enter the protection cover structure from the outside through the opening
221
. Then, short-circuiting between wires may occur in the circuit board
210
, leading to a defective electrical circuit.
Also, an electric field or magnetic field may leak from the circuit board
210
through the opening
221
to electrically adversely affect peripheral devices of the circuit board
210
.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a circuit board protection cover for preventing dust or a foreign substance from entering from the outside and for preventing leakage of an electromagnetic wave to the outside, and a circuit board having the circuit board protection cover.
In order to achieve the above object, according to the present invention, there is provided a circuit board protection cover comprising a box-like body for covering a circuit mounting surface of a circuit board entirely and made of an insulating material, and an incision selectively formed in the box-like body.
REFERENCES:
patent: 2704075 (1955-03-01), Cherkin
patent: 3496969 (1970-02-01), Bruce et al.
patent: 4919955 (1990-04-01), Mitchell
patent: 6070397 (2000-06-01), Bachhuber
Martin David
NEC LCD Technologies Ltd.
Phan Thanh S.
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