Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2000-03-10
2001-09-11
Gaffin, Jeffrey (Department: 7841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S753000, C361S752000
Reexamination Certificate
active
06288910
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a transmit-receive unit suitable for use in a portable telephone.
2. Description of the Related Art
A prior art transmit-receive unit will be described with reference to
FIG. 4. A
housing
21
made of a metal plate is shaped like a frame which is open at the top and the bottom and has a storage portion
21
b
defined by four side walls
21
a
and installation feet
21
c
provided at the bottom.
Various electric parts
23
for forming a transmitting and receiving circuit are mounted on both sides of a circuit board
22
which is a printed board, stored in the storage portion
21
b
of the housing
21
and fixed to side walls
21
a.
A pair of covers
24
and
25
are made of a metal plate and the cover
24
is attached to the housing
21
to cover the upper open portion of the housing
21
and the cover
25
is attached to the housing
21
to cover the lower open portion of the housing
21
so as to electrically shield up the inside of the housing
21
.
The transmit-receive unit constituted as described above is installed on a mother board
26
in such a manner that the installation feet
21
c
of the housing
21
are placed on a mother board
26
and soldered to an earth pattern (not shown) provided on the mother board
26
and the covers
24
and
25
are grounded to the earth pattern through the side walls
21
a
of the housing
21
.
However, since the transmit-receive unit of the prior art comprises the housing
21
made from a metal, the weight of the housing is large and the obtained transmit-receive unit for use in a portable telephone which is required to be light in weight becomes heavy.
Further, since the two covers
24
and
25
are used, their assembly is troublesome, thereby reducing productivity and boosting costs.
SUMMARY OF THE INVENTION
According to a first aspect of the present invention, there is provided a transmit-receive unit which comprises a housing shaped like a box and having a storage portion defined by a bottom wall and four side walls, a circuit board having electric parts on both sides, and a metal cover shaped like a box, wherein the housing is made from a synthetic resin and has a conductive surface layer, the circuit board is installed in the housing, the electric parts arranged on one side of the circuit board are stored in the storage portion of the housing and shield by the housing, and the electric parts arranged on the other side of the circuit board are covered by the cover and shield by the cover.
According to a second aspect of the present invention, there is provided a transmit-receive unit having an earth plate which is made of a metal plate, laid over the side wall of the housing while it is electrically connected to the cover and drawn to the under surface of the housing.
According to a third aspect of the present invention, there is provided a transmit-receive unit, wherein the earth plate has an elastic tongue-like piece in a portion drawn to the under surface of the housing.
According to a fourth aspect of the present invention, there is provided a transmit-receive unit, wherein the circuit board has a conductive pattern and the earth plate is soldered to the conductive pattern and the cover.
REFERENCES:
patent: 5373101 (1994-12-01), Barabolak
patent: 8-102592 (1996-04-01), None
patent: 9-107192 (1997-04-01), None
Saito Yoshio
Urabe Satoshi
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Gaffin Jeffrey
Vu Phuong T.
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