Communications: radio wave antennas – Antennas – With vehicle
Reexamination Certificate
2001-04-18
2002-05-07
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With vehicle
C343S872000
Reexamination Certificate
active
06384791
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a GPS receiving antenna attached to the outside of a moving object such as a ship or an automobile to receive a radio wave generated from a GPS (Global Positioning System) satellite.
2. Description of the Prior Art
The configuration of a conventional GPS receiving antenna will now be described with reference to
FIGS. 4 and 5
. A box-shaped upper case
21
, which is formed by molding a synthetic resin, comprises an upper wall
21
a
, side walls
21
b
extending from four sides of the upper wall
21
a
, a receptacle portion
21
c
surrounded by the upper wall
21
a
and side walls
21
b
and whose underside is open, and stepped portions
21
d
formed as recesses in and along the side walls
21
b.
A box-shaped lower case
22
, which is formed by molding a synthetic resin, comprises a bottom wall
22
a
, side walls
22
b
extending from four sides of the bottom wall
22
a
, a receptacle portion
22
c
surrounded by the bottom wall
22
a
and side walls
22
b
and whose upper side is open, stepped portions
22
d
formed as projections in and along the side walls
22
b
, and a pair of recess portions
22
e
each formed in the shape of a rectangular parallelepiped in the underside of the bottom wall
22
a.
The upper and lower cases
21
,
22
are combined together so that the receptacle portions
21
c
and
22
c
are opposed to each other and are mounted together by a suitable means.
As a result, a single receptacle portion is formed by the receptacle portions
21
c
and
22
c
and the stepped portions
21
d
and
22
d
are fitted together, with a packing being mounted in each of the thus-fitted portion to seal the interiors of the receptacle portions
21
c
and
22
c
. Thus, there is provided a waterproof configuration against the entry of water, etc.
An antenna body
24
is made up of: an earth plate
25
; an antenna element
26
for receiving a radio wave from a GPS satellite, the antenna element
26
being provided on the surface side of the earth plate
25
; a dielectric substrate
27
provided on the back side of the earth plate
25
, with electric components (not shown) such as resistors, capacitors and IC parts being mounted on the substrate
27
; and a shielding case
28
for shielding the dielectric substrate
27
electrically.
The antenna body
24
thus constructed is accommodated within the sealed receptacle portions
21
c
and
22
c
in such a manner that the shielding case
28
lies on the bottom wall
22
a
side of the lower case
22
.
A waterproofing sleeve
30
is fitted on an outer surface of a coaxial cable
29
and the coaxial cable
29
is mounted in a state such that the sleeve
30
is sandwiched between the upper and lower cases
21
,
22
. The coaxial cable
29
is connected to the dielectric substrate
27
and is drawn out to the exterior.
A pair of magnets
31
, each in the shape of a rectangular parallelepiped, are received respectively within the recess portions
22
e
of the lower case
22
and are attached to the lower case
22
with an adhesive
32
applied into the recess portions
22
e.
By utilizing the magnetism of the magnets
31
, the GPS receiving antenna thus constructed is attached by attraction to the outside of a moving object such as a ship or an automobile (the roof of an automobile, for example).
In the conventional GPS receiving antenna, since the adhesive
32
for mounting the magnets
31
is applied into the recess portions
22
e
of the lower case
22
, the adhesive
32
applied to upper surfaces of the recess portions
22
e
is forced out to the exterior of the recess portions
22
e by being pushed with the magnets
31
, thus giving rise to the problem that not only the commercial value is impaired but also surface-attraction of the magnets
31
is obstructed by the thus-protruded adhesive
32
, resulting in the mounting of the GPS receiving antenna becoming unstable.
Moreover, since the antenna body
24
is merely accommodated within the receptacle portions
21
c
and
22
c
, the mounting thereof is unstable and there occurs wobbling.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a GPS receiving antenna free of adhesive protrusion, capable of ensuring magnet attraction, and with an antenna body mounted firmly.
According to a first aspect of the present invention, there is provided a GPS receiving antenna comprising upper and lower cases; an antenna body received in a receptacle portion formed by the upper and lower cases; and a magnet received in a recess portion formed in a lower surface of a bottom wall of the lower case and bonded to the lower case with an adhesive, wherein a hole for communication between the recess portion and the receptacle portion is formed in the bottom wall in which the recess portion is formed, and the adhesive is applied into the hole to bond the antenna body and the magnet with each other.
According to a second aspect of the present invention there is provided, in combination with the above first aspect, a GPS receiving antenna wherein a depression is formed in the lower surface of the bottom wall opposed to the magnet so that the adhesive is present in the depression.
REFERENCES:
patent: 5585809 (1996-12-01), Yajima et al.
patent: 5706015 (1998-01-01), Chen et al.
patent: 5757327 (1998-05-01), Yajima et al.
patent: 5900840 (1999-05-01), Yajima
patent: 5943018 (1999-08-01), Miller
patent: 6023245 (2000-02-01), Gomez et al.
patent: 08148916 (1996-06-01), None
patent: 08148932 (1996-06-01), None
patent: 10135720 (1998-06-01), None
patent: Hei 10-190329 (1998-07-01), None
Ikeda Tomoki
Onishi Tadaaki
Nguyen Hoang
Wong Don
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