Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2001-04-27
2004-07-13
Nguyen, Lee (Department: 2682)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C343S702000
Reexamination Certificate
active
06763254
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a portable information terminal such as a notebook-sized personal computer, and particularly to the terminal having a circuit for wireless communication to an outside.
BACKGROUND OF THE INVENTION
Among personal computers (PC), a notebook-sized PC, which is portable and occupies a little space on a desk, has been widely used in these days.
FIG. 5
is a lateral cross sectional view of a conventional notebook-sized PC. Lid
3
is mounted to the rear end of case
1
with hinge section
2
so that lid
3
can open until a certain angle with respect to case
1
. A lock mechanism (not shown) prevents lid
3
from opening when the PC is hand carried.
Case
1
is made of metal, e.g., magnesium alloy, and formed by die-casting, or made of metal plate and formed by pressing. Thus, case
1
is conductive and shielded so that high-frequency components such as an inner clock will not leak to outside. A plurality of keys for inputting letters, numbers and marks are placed on case
1
. On the rear part of case
1
, input/output (I/O) terminal
5
, e.g., a printer output terminal, is provided.
Inside of case
1
, mother board
6
, on which major circuits including CPU
7
of the PC are mounted, is placed. Lid
3
has liquid crystal display (LCD)
8
on the surface confronting an operator. Connecting wire
9
between mother board
6
and LCD
8
is located through hinge section
2
.
In front of mother board
6
, radio circuit board
10
is mounted in case
1
for communicating to an outside, e.g., a cellular phone, personal-handy-phone, wireless local area network (LAN). An end of coaxial cable
14
is connected to an antenna terminal of radio circuit board
10
. Coaxial cable
14
is located in case
1
and connected to external antenna-connection-terminal
17
, which is disposed at the rear section of case
1
. Coaxial cable
18
from terminal
17
is located in hinge section
2
and lid
3
, i.e., behind LCD
8
, thereby connecting to antenna
19
which rises to the highest when lid
3
opens.
In such a conventional notebook-sized PC shown in
FIG. 5
, since the rear section of case
1
is crowded with I/O terminal
5
such as a printer-output-terminal and connecting wires
9
to LCD
8
, mother board
6
mounting major circuits of the PC is generally placed at a rear part of case
1
. Thus radio circuit board
10
of a wireless communication device is obliged to locate at a front part of case
1
.
Antenna
19
is disposed at the rear section of case
1
, i.e., away from a human body, in order to avoid lowering sensitivity, and is coupled to a wireless communication device with coaxial cables
14
,
18
. Coaxial cables
14
,
18
are located across case
1
from the wireless communication device disposed at the front section to antenna terminal
17
for outside as well as antenna
19
disposed at the rear section of case
1
.
Coaxial cable
14
is located near CPU
7
mounted on mother board
6
. A low level high-frequency signal is induced at antenna
19
and supplied to the input terminal of the antenna of radio circuit board
10
via coaxial cables
18
,
14
. According to this positional relation, a clock signal of CPU
7
interferes with this low level high-frequency signal and lowers its S/N ratio.
SUMMARY OF THE INVENTION
A portable information terminal having wireless communication device comprises the following elements:
A conductive case;
A radio circuit board having an antenna terminal and being placed at a front section in the case;
An external antenna terminal or an antenna placed at a rear section of the case;
A cable-leading-out hole disposed at the front section of the case;
A cable-leading-in hole disposed at the rear section of the case;
A cable-groove recessed from the surface into inside of the case, the groove running between the cable-leading-out hole and the cable-leading-in hole;
A coaxial cable connecting the antenna terminal to the external antenna terminal or the antenna; and
A lid for covering the cable-leading-out hole, the cable-leading-in hole and the cable groove.
The coaxial cable connects the antenna terminal on the radio circuit board to the external antenna terminal or the antenna through the cable-leading-out hole, cable groove, and cable-leading-in hole. The coaxial cable is free from interference with other circuits in the case, in particular with the clock in a CPU on a mother board, so that the information terminal can receive a radio signal at a high S/N ratio.
REFERENCES:
patent: 5949379 (1999-09-01), Yang
patent: 6531985 (2003-03-01), Jones et al.
patent: 6538606 (2003-03-01), Quinn et al.
patent: 2002/0013162 (2002-01-01), Whitney
patent: 2002/0101378 (2002-08-01), Quinn et al.
Nguyen Lee
Phu Sanh D
Wenderoth , Lind & Ponack, L.L.P.
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