Excellent waterproof antenna

Details Excellent waterproof antenna Excellent waterproof antenna

2002-04-25

2004-02-10

Clinger, James (Department: 2821)

Communications: radio wave antennas

Antennas

With housing or protective covering

C343S713000

Reexamination Certificate

active

06690335

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a waterproof structure of an antenna used favorably for GPS (global positioning system) receiving antennas that are mounted on the outdoor of moving objects such as ships and automobiles.
2. Description of the Related Art
The conventional waterproof structure of an antenna will be described with reference to
FIG. 10
to
FIG. 13. A
first case
51
comprising a mold product consisting of synthetic resin that is served as an under case is provided with a flat plate bottom wall
51
a,
two ring projection walls
51
b
that are different in diameter and project upward from the bottom wall
51
a,
a circular ring recess
51
c
formed between the two projection walls
51
b,
and a pair of first notches
51
d
formed on the two projection walls
51
b
so as to be positioned opposingly each other with interposition of the recess
51
c.
Furthermore, the first case
51
comprises an arc recess holder
51
e
formed at the position so as to oppose to the first notch
51
d,
a plurality of mounting holes
51
f
formed on the bottom wall
51
a,
and a recess container
51
g
positioned at the center of the projection walls
51
b.
An adhesive
52
is filled in the recess
51
c
and contained in the recess
51
c.
An antenna
53
comprises an antenna body
54
and a coaxial cable
58
, and the antenna body
54
comprises a rectangular parallelepiped antenna
55
, a printed board
56
having a wiring pattern (not shown in the drawing) for attaching the antenna
55
, and a box shield member
57
formed of a metal plate mounted on the printed board
56
.
Furthermore, the circular cable
58
comprises a sheath
60
for sheathing a core wire
59
consisting of insulating material such as rubber, and a winding
61
that is wound partially on the sheath
60
consisting of insulating material, and the core wire
59
of the cable
58
is connected to the wiring pattern of the printed board
56
by means of soldering.
The antenna body
54
of the antenna
53
having the structure as described hereinabove is contained in the container
51
g,
the cable
58
is placed in the first notch
51
d
so as to cross the recess
51
c,
and the winding
61
is positioned on the holder
51
e.
The width of the first notch
51
d
is formed so as to be approximately equal to the diameter of the cable
58
. As the result, when the cable
58
is inserted into the first notch
51
d,
the sheath
60
of the cable
58
is inserted into with pressure and tightly compressed on the inside of the first notch
51
d
and the sheath
60
of the cable
58
is in tight contact with the bottom of the first notch
51
d.
Furthermore, when the cable
58
has inserted with pressure into the first notch
51
d,
the bottom of the cable
58
is positioned in the adhesive
52
contained in the recess
51
c,
and around the bottom half of the cable
58
, the space between the first notch
51
d
and the cable
58
is sealed with the adhesive
52
and the bottom half of the cable
58
is sealed by pressing the sheath
60
of the cable
58
with pressure on the inside wall of the first notch
51
d
. Thereby, the container
51
g
is sealed on the lead-out side of the cable
58
of the first case
51
side.
A second case
62
comprising a mold product consisting of synthetic resin that is served as a upper case comprises a bowl-shaped top wall
62
a
having the same peripheral configuration as that of the bottom wall
51
a
, a circular ring projection
62
b
that projects downward from the top wall
62
a,
a second notch
62
c
formed on the projection
62
b
having the same width as that of the first notch
51
d
that is positioned so as to oppose to the first notch
51
d,
a circular recess holder
62
d
formed at the position so as to oppose to the second notch
62
c,
a plurality of mounting holes
62
e
formed on the top wall
62
a
at the positions opposing to the mounting holes
51
f
, and a recess container
62
f
positioned at the center of the projection
62
b.
The second case
62
is fitted combinedly to the first case
51
so as to cover over the antenna body
54
, and a plurality of screws
63
are inserted and screwed from the mounting holes
51
f
side of the first case
51
into the mounting holes
62
e
of the second case
62
to thereby combine the first case
51
to the second case
62
.
When the first and second cases
51
and
62
are combined, the winding
61
of the sheath
60
of the cable
58
is held with the holders
51
e
and
62
d,
the projection
62
b
is inserted into the recess
51
c,
and the top end of the projection
62
b
is embedded into the adhesive
52
.
Furthermore, at that time, the cable
58
is positioned in the second notch
62
c,
the top of the second notch
62
c
presses the sheath
60
onto the first notch
51
d
side, the sheath
60
is inserted with pressure into and tightly pressed on the inside wall of the second notch
62
. Thereby, the container
62
f
is sealed on the lead-out side of the cable
58
of the second case
62
side.
In other words, on the lead-out side of the cable
58
of the first and second cases
51
and
62
, by inserting with pressure into and tightly pressing the cable
58
on the first and second notches
51
d
and
62
c,
the containers
51
g
and
62
f
are sealed, and by embedding the projection
62
b
in the adhesive
52
, the surrounding of the container
51
g
and
62
f
is sealed. As the result, the antenna body
54
is waterproofed.
Next, a method for combining the first and second cases
51
and
62
will be described with reference to FIG.
13
. As shown in
FIG. 13
, the second case
62
covers the first case
51
so that the second notch
62
c
is fitted to the cable
58
in the state that the cable
58
has been inserted with pressure into the first notch
51
d
of the first case
51
.
As the result, at first, the inside wall that is opposing to the second notch
62
c
is brought into contact with the sheath
60
, and when the second case
62
is moved downward further in this state, the top end of the projection
62
b
is embedded in the adhesive
52
.
The surface of the adhesive
52
moves upward concomitantly with embedding of the projection
62
b,
the top of the second notch
62
c
presses the sheath
60
of the cable
58
, the sheath
60
is pressed on the bottom of the first notch
51
d,
and the combination of the first and second cases
51
and
62
is completed.
However, though the surface of the adhesive
52
moves upward concomitantly with embedding of the projection
62
b
when these cases
51
and
62
are combined, because the width of the second notch
62
c
is formed so as to be approximately equal to the diameter of the cable
58
, there is no space between the second notch
62
c
and the top open portion of the cable
58
. As the result, the adhesive
52
does not penetrate into the space between the second notch
62
c
and the cable
58
though the surface of the adhesive moves upward, and no penetration of the adhesive
52
results in poor sealing between the second notch
62
c
and the cable
58
and the results in poor waterproofing of the containers
51
g
and
62
f.
In particular, variation of contact tightness between the second notch
62
c
and the cable
52
due to variation of the width of the second notch
62
c
caused when the second case
62
is fabricated or variation of the diameter of the cable
58
or a slight space between the second notch
62
c
and the cable
52
results in poor sealing and further results in poor waterproof of the containers
51
g
and
62
f.
There is no space between the second notch
62
c
and the open end top of the cable
58
because the width of the second notch
62
c
is formed so as to be approximately equal to the diameter of the cable
58
in the case of the waterproof structure of the conventional antenna. As the result, the adhesive
52
does not penetrate into the space between the second notch
62
c
and the cable
58
, and no penetration of the adhesive
52
results in poor sealing between the second

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