Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1997-11-20
2001-02-13
Pham, Chi H. (Department: 2731)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S426100, C370S337000
Reexamination Certificate
active
06188916
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a communication system of a portable communication terminal, an incoming call control system of a portable communication terminal and an incoming call notifying device of a portable communication terminal between the portable communication terminal (portable telephone) such as a cellular radio telephone and a PHS (personal handyphone system), and peripheral equipment such as an incoming call device (vibrator) for notifying the user about the incoming call.
BACKGROUND ART
A typical conventional portable telephone is adapted to notify the user about an incoming call by sound (ringing tone) and another type of portable telephone is designed to notify the user about an incoming call additionally by vibrating a built-in vibrator of a portable telephone body in order to prevent a nuisance from being cause to those around the user due to the generation of noise. Although this type of portable telephone is certainly able to eliminate the noise caused by the ringing tone, the disadvantage is that when the portable telephone is put into a bag or a pocket of a suit jacket that has been taken off, it is not possible to notify the user about an incoming call.
Therefore, a so-called independent vibrator type portable telephone has been proposed in that the user is notified of an incoming call by causing a small vibrator which is provided separately from the portable telephone body to vibrate when the incoming call is received. The vibration of the separated vibrator is generated by rotating a motor as a vibration source intermittently for a predetermined time when the portable telephone body detects the incoming call and instructs the vibrator to vibrate; that is, the whole vibrator is then vibrated to notify the user about the incoming call and subsequently its operation is stopped.
With the independent vibrator type portable telephone like this, the user is supposed to keep carrying the vibrator about the body so that the user may sense the vibration of the vibrator with the skin, whereby even though the portable telephone is put in a bag or placed somewhere separately from the body, the user is certainly notified of the incoming call.
The aforementioned independent vibrator type portable telephone is designed to transmit a radio wave W
2
from the portable telephone to the vibrator in addition to a radio wave W
1
from the portable telephone to a base station. The radio wave W
2
is transmitted as a command signal from the portable telephone to the vibrator when an incoming call is received by the portable telephone from the base station, whereby the vibrator starts vibrating to notify the user about the incoming call.
While the radio wave W
2
is being transmitted from the portable telephone to the vibrator, however, if the radio wave W
1
is simultaneously transmitted from the portable telephone to the base station, the radio wave W
1
directed to the base station may interfere with the radio wave W
2
directed to the vibrator in a portion where both the radio waves are superimposed as shown in
FIG. 25
because the radio wave W
1
is stronger than the radio wave W
2
. Therefore, the command signal fails to reach the vibrator and no vibration is generated therefrom, whereupon the user is not notified of the incoming call.
In the case of such a portable telephone as mentioned above, the vibrator detects a radio wave for use in transmitting an ST (control tone) signal or a DST (digital control tone) signal to the base station through a voice channel and vibrates itself until the user sets the portable telephone off hook against an incoming call from the base station.
Since the vibrator keeps detecting the transmission wave sent out by the portable telephone in the prior art method, however, it may detect a radio wave in the neighborhood of 900 MHz sent out by anything other than the portable telephone. Therefore, the vibrator may start vibrating as it misjudges that an incoming call is received by itself though no incoming call is received by the portable telephone.
In addition to the problem above, there is another one arising from a case where the vibrator starts vibrating though no incoming call is received by the proper portable telephone because the vibrator detects the radio wave sent out by a portable telephone carried by a person other than the owner of the vibrator.
In the case of a small portable receiver such as a pager, a loop antenna as described in Postexamined Japanese Patent Publication 53-30977/(1978) is employed.
FIG. 26
shows a conventional loop antenna.
As shown in
FIG. 26
, the surface of a grounded board
834
intersects the open face of a loop antenna
832
and as shown in
FIG. 27
, the open face of the loop antenna
832
is disposed in a direction perpendicular to the tangent of the side face
838
of the human body at the time the portable receiver is fitted thereto (e.g., put into a pocket). Further, a tuning capacitive capacitor
835
is juxtaposed between one end portion
832
a
of the loop antenna
832
and the grounded board
834
. The other end portion
832
b
of the loop antenna
832
and the grounded board
834
are short-circuited and the loop antenna
832
is supplied with power from a tap feeding part
837
.
The loop antenna
832
is hardly affected by the human body since the loop antenna
832
is arranged so that the side face
838
of the human body and the loop face are set perpendicular to each other by making most of the advantage of a magnetic-field type antenna. When the grounded board
834
is considered as a criterion, the tap feeding part
837
simultaneously has the factor of a monopole antenna which is top-loaded with the loop antenna
832
and also operates as an electromagnetic type antenna. Since magnetic-field and electromagnetic-field type polarized wave faces intersects in view of the construction of the loop antenna
832
, the portable receiver is capable of dealing with both the vertical-horizontal polarized waves.
However, the loop of the loop antenna
832
has to be wound on the grounded board
834
perpendicularly and when the loop antenna
832
is adopted in the small portable receiver, the open area of the loop is hardly enlarged. Therefore, its gain deteriorates and consequently the drawback is that the malfunction of the receiver is incurred.
Since the loop is designed to be wound across the grounded board
834
, parts on the grounded board
834
tend to be badly affected when they are installed close to one another and the drawback is that the malfunction of the receiver due to gain deterioration and characteristic variations at the time mass production (variations in the positional relation between each part and the loop at the time of assembly) are brought about.
An object of the present invention is to provide a communication system of a portable communication terminal, an incoming call control system of a portable communication terminal and an incoming call notifying device of a portable communication terminal capable of obviating the malfunction of a vibrator as the drawback of a conventional independent vibrator type portable terminal.
SUMMARY OF THE INVENTION
A communication system of a portable communication terminal according to the present invention comprises a portable communication terminal capable of movably communicating with another communication terminal via radio communication with a base station, and peripheral equipment which performs a predetermined operation via radio communication with the portable communication terminal, wherein the portable communication terminal transmits a radio signal to the peripheral equipment by using a time division multiplex access system for exchanging signals by putting data on a time slot as the radio communication between the portable communication terminal and the peripheral equipment and using the time slot in a time zone excluding other time zones in which the portable communication terminal is transmitting a radio signal to the base station.
Thus since not only the time division multiplex access system for exchangi
Iwabuchi Kazuhiro
Nakagaki Syuji
Nakazato Kouji
Noda Masanobu
Saito Masayuki
Hogan & Hartson LLP
Kyocera Corporation
Pham Brenda H.
Pham Chi H.
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