Telecommunications – Transmitter – With coupled antenna
Reexamination Certificate
2000-10-24
2004-11-02
Chin, Vivian (Department: 2682)
Telecommunications
Transmitter
With coupled antenna
C455S080000, C455S097000, C455S090300, C455S280000, C343S702000, C343S895000
Reexamination Certificate
active
06813481
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a mobile radio machine, and more particularly to, a mobile radio machine used as a mobile telephone set or a mobile small computer.
BACKGROUND OF THE INVENTION
FIGS. 1A and 1B
are structural diagrams showing a conventional example of mobile radio machine when its antenna is pulled out and restored, respectively. In
FIGS. 1A and 1B
, a linear antenna (rod antenna)
91
and a coil antenna
93
at the tip portion, which is exclusively used when antenna is restored, are connected in a line and in a state that each being insulated from the other by an insulating member
92
to compose a whip antenna. Also, a feeding terminal
94
is connected via a matching circuit
95
to a radio circuit
96
.
In the above conventional mobile radio machine disclosed in Japanese patent application Laid-open No.8-84017 (1996), when antenna is restored, as shown in
FIG. 1A
, the feeding terminal
94
is connected to the coil antenna
93
for exclusive use in antenna restored time, and the coil antenna
93
operates, while when antenna is pulled out, as shown in
FIG. 1B
, the feeding terminal
94
is connected to the rod antenna
91
, and the rod antenna
91
operates.
However, in the conventional mobile radio machine, depending upon the size of radio machine, the rod antenna
91
can not be restored in its main body. Also, in the case of a folding type mobile radio machine the rod antenna
91
can not be restored in it.
As another conventional example, such a mobile radio machine is known that a lower antenna and an upper antenna are connected to be foldable at the connecting portion, and when pulling out, the lower antenna is pulled out from the main body to compose a rod antenna with the upper antenna, and when restoring, only the lower antenna is restored in the main body and the upper antenna is tilted through 90° from the connected portion composing fulcrum and fixed to an antenna fixing portion on the upper part of the main body (Japanese utility model application laid-open No.4-10408). Also, a mobile radio machine enabled to put a rod antenna element in the main body or pull it outside the main body and rotate such pulled-out antenna to a desired angle is known. (Japanese patent No.2530067).
Also, there is a mobile radio machine in which a linear antenna with long antenna length is enabled to attach to and detach from an connector freely, and in a state that the linear antenna is not attached to the connector, a lay-able type antenna of short antenna length stands uprightly, and when the linear antenna is attached to the connector, the lay-able type antenna is automatically laid in the main body (Japanese patent No.2546922).
Further, a mobile radio machine where a thicker part for the prevention of fall is provided on a part of the main body, and in the thicker part a concave portion capable of receiving a tip of the antenna is formed is known (Japanese utility model application Laid-open No.61-191636).
However, in the conventional mobile radio machine disclosed in Japanese utility model application laid-open No.4-10409 or Japanese patent No.2530067, the lower-part antenna or the rod antenna, though the antenna length itself is shorter than that in former one, is restored in the main body, and therefore the structure is not suitable for a small-size folding type mobile radio machine. In the conventional mobile radio machine disclosed in Japanese patent No.2546923, when using the linear antenna of long length, there is a disadvantage in working efficiency because the work attaching it to the connector is required, and also there is an anxiety that the linear antenna is missing. Further, in the conventional mobile radio machine disclosed in Japanese utility model application Laid-open No.61-191636, though the antenna restoring portion is not provided inside the main body, it is not suitable for a small-size folding type mobile radio machine. Also, the antenna can not function as antenna when it is restored in the concave portion.
Besides, as a conventional mobile radio machine, a mobile radio machine in which an antenna element is enabled to stretch and contract freely, and even when the antenna element is restored, it does not lose the function as radio machine is known (Japanese examined patent publication No.6-12850)
In this conventional mobile radio machine, a feeding point is provided at one position, and when an antenna element is laid, the length is shortened to &lgr;/4 and the antenna element is used as loop antenna. But, the exact antenna length is not always obtained and varies in some cases. For this reason, a matching circuit connected to a clasp which holds the antenna element when being laid is switched to inductive circuit or capacitive circuit, depending on whether the antenna length is longer or shorter than &lgr;/4. However, in order to switch the matching circuit connected to the clasp to inductive circuit or capacitive circuit or ground (in case that the antenna length is &lgr;/4 exactly) according to the antenna length, it is needed to discriminate the antenna length by some method at each time the antenna is laid. Also, the composition of radio machine becomes complicated because, when the antenna is restored, three kinds of matching circuits must be provided corresponding to antenna length and be switched among them.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a mobile radio machine with such structure that an antenna can be used even in a folding-type mobile radio machine by forming the antenna to be lay-able type.
It is a further object of the invention to provide a mobile radio machine with simple structure which can be used as radio machine even when an antenna is restored.
According to the first aspect of the invention, a mobile radio machine, comprises:
an antenna including a linear antenna element which is a lower portion thereof, and a coil antenna element which is an upper portion thereof, the linear and coil antenna elements being separated by an insulating member, and the antenna being rotated on a lowest position thereof to take a standing-up position so that the linear and coil antenna elements are exposed to outside of a main body, and to take a laying-down-position so that the coil antenna element is only exposed to outside of the main body, while the linear antenna element is restored in the main body;
a first feeding terminal for making a contact with the linear antenna element in the standing-up position;
a second feeding terminal for making a contact with the coil antenna element in the laying-down position;
a first impedance matching circuit connected via the first feeding terminal to the linear antenna element;
a second impedance matching circuit connected via the second feeding terminal to the coil antenna element; and
a switching circuit for connecting the first impedance matching circuit to a radio circuit, when the antenna takes the standing-up position, and connecting the second impedance matching circuit to the radio circuit, when the antenna takes the laying-down position.
According to the second aspect of the invention, a mobile radio machine with a lay-able type antenna enabled to stand uprightly and be restored in a main body of the radio machine around a rotating shaft provided on a part of the main body, the radio machine comprises:
an antenna which is the lay-able type antenna comprising a first conductive feeding terminal provided with the rotating shaft at its end, a linear antenna element connected at its one end with the first conductive feeding terminal, an insulating member connected with the other end of the linear antenna element, a conductive contact terminal connected with one end of the insulating member, a coil antenna element electrically connected with the other end of the contact terminal and its center axis being located on the extended line of center axis of the linear antenna element;
a switch for detecting whether the antenna being in uprightly standing state or being in restored state;
a second conductive feeding terminal allocat
Chin Vivian
NEC Corporation
Pan Yuwen
Sughrue & Mion, PLLC
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