Communications: radio wave antennas – Antennas – Antenna with parasitic reflector
Reexamination Certificate
2001-02-22
2002-06-04
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
Antenna with parasitic reflector
C343S872000, C333S02100R
Reexamination Certificate
active
06400333
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a waterproofing case construction of a satellite-broadcast receiving converter.
2. Description of the Related Art
Referring to
FIG. 9
, a conventional case construction of a satellite-broadcast receiving converter will be described. The satellite-broadcast receiving converter
21
comprises a body
23
including a cabinet
22
, in which a receiving circuit is accommodated, and a coaxial connector
24
mounted to the body
23
to take electric signals out.
A case
25
comprises first and second molded case members
26
,
27
made of synthetic resin. With the body
23
being accommodated in the housing
25
a
, which is formed by combining the first and second case members
26
,
27
, the connector
24
is provided so as to project outwardly through a hole
26
a
of the first case member
26
. Further, the case is so constructed that the hole
26
a
between the connector
24
and the first case
26
is filled with a sealing member
28
, the housing
25
a
made up of the first and second cases
26
,
27
is completely sealed, and the air does not flow into the housing
25
a
from the outside.
Thus, by completely sealing the housing
25
a
in the case
25
, water is prevented from entering the housing
25
a
from the outside.
The satellite-broadcast receiving converter having such construction is brought into an inspection device, and the pressure of the air in the inspection device is increased or reduced to check if the housing
25
a
of the case
25
has leakage of air.
Then, the accepted satellite-broadcast receiving converter under the inspection is put on the market, set outdoors, and used.
However, when a satellite-broadcast receiving converter with the housing
25
a
completely sealed is used outdoors, particularly in summer, at high outdoor temperatures, the air inside the housing
25
a
would expand to destroy the case
25
or the sealing member
28
.
The conventional satellite-broadcast receiving converter is so constructed as to completely seal the housing
25
a
of the case
25
. Therefore, it has such problems that, particularly in summer, when the outdoor temperature gets higher, the air inside the housing
25
a
expands and destroys the case
25
or the sealing member
28
.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a case construction of a satellite-broadcast receiving converter in which the case or the sealing member is not destroyed and waterproofing of the housing is possible.
As a first embodiment to solve the above problems, the case construction of a satellite-broadcast receiving converter comprises a satellite-broadcast receiving converter having a body and a connector, and a case having a housing to accommodate the body; wherein the connector of the satellite-broadcast receiving converter projects outwardly from the case while an entire portion of the body being covered with the case, a portion of the case includes a cavity provided between an inner part and an outer part of the case, a closing part so formed as to close the outer part of the cavity and a hole so made in the closing part as to provide communication between the outside of the case and the cavity, and the inner part of the cavity is closed with a waterproofing and gas-permeable filter.
Further, as a second embodiment, the filter is disposed so as not to oppose a face of the closing part.
Further, as a third embodiment, the closing part is formed of a thin wall.
Further, as a fourth embodiment, the closing part is formed on the outer surface of the case and the filter is provided on the inner surface of the case.
Further, as a fifth embodiment, the filter is affixed to the case by adhesive.
Further, as a sixth embodiment, the filter is supported by a cabinet making up the body of the satellite-broadcast receiving converter.
Further, as a seventh embodiment, a face of the closing part is disposed perpendicularly to the projecting direction of the connector from the case.
Further, as an eighth embodiment, the closing part is positioned in the vicinity of the connector.
REFERENCES:
patent: 4896163 (1990-01-01), Shibata et al.
patent: 5982336 (1999-11-01), Wen et al.
patent: 6127986 (2000-10-01), Wen et al.
patent: 10-190491 (1998-07-01), None
patent: 11-186845 (1999-07-01), None
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Le Hoang-anh
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