Communications: radio wave antennas – Antennas – With support for antenna – reflector or director
Reexamination Certificate
1999-04-26
2001-01-09
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With support for antenna, reflector or director
C343S766000, C343S757000
Reexamination Certificate
active
06172653
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile satellite communication antenna suitable for a satellite communication and for receiving a satellite broadcasting by a mobile like a car and the like.
2. Description of Related Art
A conventional mobile satellite communication antenna, as shown in
FIG. 4
to
FIG. 6
, comprises a flat main plate
51
and an auxiliary plate
52
, and the main plate
51
and the auxiliary plate
52
overlap one another and are combined with screws
3
.
The plate
51
is provided with a motor
55
provided with a gear
54
and a converter
57
having a probe
56
.
Further, as shown in
FIG. 6
, a shaft
58
fixed to the auxiliary plate
52
is rotatably mounted with a pulley
59
having a groove
59
a
and a plurality of pulleys
59
having the constitution like this are arranged concentrically with respect to the center part of the main plate
51
.
Further, a ring-shaped rotary member
60
comprising a formed product made of synthetic resin has a trapezoidal groove
60
a
having a gear part (not shown) on the whole outer periphery thereof, a ring-shaped protruding part
60
b
made on the lower part of the groove
60
a,
and a hole
60
c
made in the center part thereof.
Further, although not shown here, a plurality of antenna elements are formed concentrically on a disc-shaped antenna board
61
, and the antenna board
61
is arranged on the top surface of the rotary member
60
in such a way that it closes the hole
60
c
and is fixed to the rotary member
60
with screws
62
.
Further, a ring-shaped preventing member
63
made of a metal plate is arranged on the top surface of the rotary member
60
such that it is positioned outside the antenna board
61
, and is fixed to the rotary member
60
with screws
64
. When the preventing member
63
is fixed, a part of the preventing member
63
protrudes outward in the radial direction from the outer periphery of the rotary member
60
.
An antenna board member
65
is composed of the rotary member
60
, the antenna board
11
and the preventing member
63
and is rotatably supported by the pulley
59
with the ring-shaped protruding part
60
b
of the rotary member
60
retained by the grooves
59
a
of the plurality of pulleys
59
.
In this respect, the center part of the antenna board
61
is in the state opposite to the probe
56
and supplies radio waves from the antenna elements to the probe
56
.
Further, a toothed endless belt
66
is looped around the groove
60
a
having a gear part of the rotary member
60
and the gear mounted on the motor
55
, and the antenna board member
65
is rotated by the motor
55
via the belt
66
.
In this connection, the top end of the belt
66
looped around the groove
60
a
of the rotary member
60
is prevented from coming off by the preventing member
63
protruding outward in the radial direction from the rotary member
60
.
Further, a lever
68
is mounted on the plate
52
such that it can be turned around a shaft
67
, and a pulley
69
is rotatably mounted on the lever
68
. A spring
70
is interposed between the lever
68
and the plate
52
.
The pulley
69
is brought into contact with the outer side of the belt
66
and is pulled by the spring
70
via the lever
68
to eliminate the looseness of the belt
66
.
The mobile satellite communication antenna having the constitution described above is mounted on the roof of a mobile like a car and the like, and the antenna board member
65
is rotated by the motor
55
with the movement of the mobile to adjust the orientation to a geostationary satellite.
In the conventional mobile satellite communication antenna, since the antenna board
61
and the preventing member
63
for preventing the belt
66
from coming off are attached to the rotary member
60
, the number of parts are increased and the costs increases. Further, a space in which the preventing member
63
is mounted is needed, whereby the size becomes large.
Further, since the rotary member
60
is made of synthetic resin, the expansion and shrinkage of the rotary member
60
caused by a change in environmental temperature outdoors is extremely large, which produces another problem that the antenna board member
65
can not be smoothly rotated and is finally put out of rotation.
SUMMARY OF THE INVENTION
To solve the above-mentioned problems, the present invention provides, as the first solving means, a mobile satellite communication antenna comprising a rotary antenna board member including an antenna board having a plurality of antenna elements and a rotary member provided with the antenna board, a flat plate for holding the antenna board member rotatably, and a belt for rotating the antenna board member, wherein the belt is looped around a groove provided in the rotary member and the antenna board is mounted on the top surface of the rotary member in the state where a part of the antenna board protrudes outward in the radial direction from the outer periphery of the rotary member.
The present invention provides, as the second solving means, the rotary member formed of aluminum die casting.
REFERENCES:
patent: 5982333 (1997-08-01), Stillinger et al.
patent: 8-78936 (1996-03-01), None
Ikeda Tomoki
Ohnishi Tadaaki
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Clinger James
Wong Don
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