JP2773769B2 - Mobile phone and mobile phone anti-theft system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone and its anti-theft system.

[0002]

2. Description of the Related Art A conventional anti-theft system for a portable telephone is disclosed, for example, in Japanese Patent Publication No. 63-65250. This anti-theft system enables, for example, when a mobile phone is mounted on a car and used, when the car is stolen, the tracking can be performed even when the mobile phone is not used. It is intended to be.

In order to achieve the above object, a base station transmits a notification signal indicating the number of a stolen mobile phone to a mobile phone in the area.

On the other hand, in a portable telephone, a monitor means for determining whether or not the number of the notification signal coincides with its own number at a fixed cycle irrespective of whether the power switch is on or off; Activating means for activating the transmitting section when it is determined that the number of the transmitting section coincides with the own number, and a special signal including the own number is transmitted from the transmitting section.

[0005] When the base station receives a special signal including the same number as the number indicated by the broadcast signal, the received information is visually displayed to enable tracking.

[0006]

In this conventional anti-theft system, a notification signal sent from a base station is constantly monitored regardless of whether a power switch is on or off. This means that the power consumption of the mobile phone increases and the battery voltage decreases faster.

[0007] In general, a portable telephone uses a rechargeable battery that can be attached to and detached from the portable telephone as a power source. This means that if the battery is removed from the mobile phone main body, not only the monitoring by the monitoring means but also the transmission of the special signal becomes impossible, so that the purpose cannot be achieved.

It is an object of the present invention to provide a portable telephone which can prevent theft while improving the battery saving efficiency.

Another object of the present invention is to provide a portable telephone capable of tracking even when a detachable battery is removed from the portable telephone.

Another object of the present invention is to provide an anti-theft system suitable for the portable telephone.

[0011]

According to the present invention, a power supply from a keyboard, a display unit, and a main battery is turned on.
A power key for turning off, a radio unit that demodulates a received signal to obtain a demodulated signal, modulates and outputs a transmission signal, and a control unit that controls the keyboard, the display unit, and the power key. A mobile phone having a pre-registered number, the mobile phone further comprising:
Charging the auxiliary battery with a battery and the main battery
And a power supply from the auxiliary battery.
The mobile phone transmits a location registration signal including the pre-registered number to a base station at the time of a location registration operation, and the pre-registered number is stolen from the base station. Receiving a notification signal indicating whether or not the number of the mobile phone is performed, the control unit,
When a predetermined key operation is performed on the keyboard,
Or, if the previously registered number was stolen
Receiving the notification signal indicating that the number is a telephone
The control unit further turns off the keyboard and the power key when the notification signal indicates that the pre-registered number is the number of the stolen mobile phone. And turning off the display on the display unit and transmitting an alarm signal to the base station.

[0012]

Further, the charging circuit may be provided with an overcurrent protection circuit for protecting the auxiliary battery.

[0014]

According to the present invention, a keyboard, a display unit, a power key for turning on / off the power supply from the main battery, a demodulated signal to obtain a demodulated signal, and a transmission signal A radio section for modulating and outputting a signal; a control section for controlling the keyboard, the display section and the power key ; an auxiliary battery;
A charging circuit for charging the battery; and the auxiliary battery.
And a base station for connecting the mobile phone to a telephone exchange network, the mobile phone having a number registered in advance, the mobile phone having A location registration signal including the previously registered number is transmitted to the base station, and the base station is included in a memory storing a stolen mobile phone number and in the location registration signal transmitted from the mobile phone. Determining means for determining whether the pre-registered number matches the number of the stolen mobile phone stored in the memory, and wherein the pre-registered number of the stolen mobile phone is When matching the number, and sends a notification signal indicating that the pre registration number is a number of a mobile phone is stolen to the mobile phone, before Control unit, said keyboard odor
When the specified key operation is performed, or
The registered number is the number of the stolen mobile phone
Switch is turned off when the notification signal indicating that
And down, the control unit further, when the previously registered number to receive the broadcast signal indicating a number of a mobile phone is stolen, as well as disable the operation of the keyboard and the power key, the The display of the display unit is turned off, and control for transmitting an alarm signal to the base station is performed, and the base station receives the alarm signal and performs tracking of the mobile phone. The system is obtained.

[0016]

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. In FIG. 1, this mobile phone has a pre-registered number, and in addition to a main battery 1, a radio unit 6, a keyboard 8, a power key 9, a display unit 10, and an antenna 11, which are the same as those of the conventional type telephone, It has an auxiliary battery 2, an overcurrent protection circuit 3, diodes 4, 5 and a switch 12, and a control unit 7 for controlling each unit.

The main battery 1 is rechargeable and is externally mounted to supply power to the portable telephone. The auxiliary battery 2 is built in the mobile phone,
As will be described in detail below, the alarm signal is to be continuously transmitted even when the main battery 1 is removed. This auxiliary battery 2 can be charged by the main battery 1. The overcurrent protection circuit 3 limits the current flowing when the auxiliary battery 2 is charged, and
Is to protect. The diode 4 is for suppressing the outflow of current from the auxiliary battery 2 through the overcurrent protection circuit 3. The diode 5 is for preventing a current from flowing from the auxiliary battery 2 to the main battery 1 side. In other words, the diode 5 is used to enable the power of the main battery 1 to be supplied to all loads including the auxiliary battery 2. The switch 12 is normally open. When the mobile station recognizes that the mobile phone is a stolen mobile phone according to the location registration procedure described with reference to FIG. Can be turned on by the control unit 7 by a predetermined key input from the keyboard 8 when the remaining capacity becomes insufficient.

The control unit 7 is connected to the radio unit 6, the keyboard 8, the power key 9, and the display unit 10 and controls them. Radio section 6 demodulates the received signal received through antenna 11. In transmission, the transmission signal is modulated and transmitted from the antenna 11. When the demodulated received signal includes a number that matches the number of itself, control section 7 performs control for the subsequent call operation. Further, this type of mobile phone has a remaining capacity indicator (not shown) for displaying the remaining capacity of the main battery 1.

The operation associated with the theft prevention will be described with reference to FIG. The anti-theft here is intended to prevent the use of a stolen mobile phone, that is, theft of the mobile phone by preventing the theft, and such anti-theft is also included in the anti-theft. Shall be. Also,
When the mobile phone is stolen, the stolen mobile phone number is registered in the memory of the base station based on the notification.

Referring to FIG. 2, when the power key 9 is turned on in the portable telephone, the control 7 monitors the electric field level while channel-scanning the signal transmitted from the base station (S1).

Based on the monitoring result, a channel having a strong electric field is determined (S2). The mobile phone transmits a location registration signal including the determined channel (base station having the channel) in order to register the number of the mobile station (S3). The base station transmits a mobile station (cellular phone) control signal designating a control channel for communication, and determines whether the number included in the received location registration signal matches the number registered in the memory. Then, a notification signal indicating the presence or absence of a match is transmitted.

The mobile phone receives and analyzes the mobile station control signal sent from the base station to determine a control channel, and also, based on the broadcast signal, broadcast information indicating whether or not the own station is a stolen mobile phone. Is taken out (S4, S5). Then, based on the contents of the notification information, it is determined whether or not the own station is a stolen mobile phone (S6).

If the own station is a stolen mobile phone, the operation of the power key 9 is disabled so that the power cannot be turned on and off in order to prevent theft.
The display on the display unit 10 is erased, input from the keyboard 8 is ignored, and the mobile phone is disabled (S7, S7).
8).

The mobile phone continues to send an alarm signal to the base station for theft tracking. This alarm signal recognizes that the station is a stolen mobile phone,
The purpose is to provide a notification to the base station that the terminal has been set to the unusable state, and a means for informing the current position of the own station (S9).

If the mobile station is not a stolen mobile phone, the control unit 7 enters a standby state in which the control unit 7 monitors a given control channel so that a call can be made and received at any time (S10).

Next, referring to FIG.
When a location registration signal including a telephone number or the like for registering the own station is transmitted from the base station 20, the base station 20 receiving the location registration signal extracts the information of the telephone number and retrieves the information of the stolen mobile phone stored in the memory 21. Check the number list and determine
To determine whether the telephone number corresponds to a stolen mobile phone. Then, the determination result is transmitted on the notification signal.

Next, the operation of the main battery 1 and the auxiliary battery 2 related to power supply will be described. First, when the main battery 1 is connected and the switch 12 is open, the main battery 1 supplies power to the load and charges the auxiliary battery 2. The auxiliary battery 2 does not supply power to others.

[0029] The user looks at the fuel level indicator and reads the main battery 1.
When the control unit 7 knows that the remaining battery power has run out, the control unit 7 turns on the switch 12 by performing a predetermined key operation on the keyboard 8 as described above. As a result, power is supplied from the auxiliary battery 2.

When the control unit 7 recognizes that the mobile phone is a stolen mobile phone at the time of location registration,
The switch 12 is turned on in order to supply power from the auxiliary battery 2 also when the notification signal from the terminal indicates that the number of the own station is the number of the stolen mobile phone. In this state, even if the main battery 1 is removed, the switch 12 is on, so that the power supply can be continued and the transmission of the alarm signal for theft tracking does not stop. This also takes into account that the present mobile phone is mounted on an automobile and used. That is, in such a case, the main battery 1 is often used instead of the main battery 1 by obtaining power from a battery mounted on the automobile through a cigar socket.
In this case, even if the plug for connecting the mobile phone to the cigarette socket is unplugged, the transmission of the alarm signal can be continued.

[0031]

As described above, the portable telephone according to the present invention does not always monitor the signal from the base station, but is once stolen from the base station when the portable telephone is powered on and the location registration operation is performed. When it is notified, the display output and keyboard operation input are stopped, and then an alarm signal indicating that the phone is a stolen mobile phone is continuously transmitted. Since the alarm signal is continuously transmitted, it can be used as a specific clue of the place of use.

Further, since the auxiliary battery is provided inside the portable telephone when the main battery provided in the portable telephone is removed, the transmission of the alarm signal is not stopped. The only way to erase it is to break the mobile phone, and you can thoroughly track theft.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a mobile phone according to the present invention.

FIG. 2 is a flowchart illustrating an anti-theft operation associated with location registration according to an embodiment of the present invention.

FIG. 3 is a configuration diagram schematically showing an embodiment of an anti-theft system according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main battery 2 Auxiliary battery 3 Overcurrent protection circuit 4, 5 Diode 6 Radio section 7 Control section 8 Keyboard 9 Power key 10 Display section 11 Antenna 12 Switch 20 Base station 21 Memory 22 Judgment section 30 Mobile phone

Claims (3)

(57) [Claims] 1. A keyboard, a display unit, a power key for turning on / off a power supply from a main battery, and a radio for demodulating a received signal to obtain a demodulated signal and modulating a transmitted signal for output. And a control unit for controlling the keyboard, the display unit, and the power key, the mobile phone having a pre-registered number, the mobile phone further includes an auxiliary battery and the main battery.
A charging circuit for charging the auxiliary battery with
A switch that enables power supply from the auxiliary battery
Wherein, the portable phone transmits a location registration signal including the pre-registered number when location registration to the base station is the number of the mobile phone which the previously registered number is stolen from the base station The control unit receives a notification signal indicating whether or not a predetermined key operation has been performed on the keyboard.
Was performed, or the previously registered number
Is a stolen mobile phone number.
And turn on the switch upon receiving the knowledge signal, even before Symbol controller, when the number notification signal said previously registered is indicative of the number of the stolen mobile telephone, the keyboard and the power A mobile phone, wherein a key operation is disabled, a display on the display unit is turned off, and a control is performed to transmit an alarm signal to the base station. 2. The mobile phone according to claim 1, further comprising: a charging circuit for protecting the auxiliary battery.
A mobile phone provided with the overcurrent protection circuit according to (1) . 3. A keyboard, a display, and a main battery.
A power key for turning on and off the power supply,
Demodulates the transmitted signal to obtain a demodulated signal, and modifies the transmitted signal.
Radio section for adjusting and outputting, the keyboard and the display section
And a control unit for controlling the power key and an auxiliary battery.
To charge the auxiliary battery with the main battery
Charging circuit and power supply from the auxiliary battery
And a switch that is registered in advance.
Mobile phone and connecting the mobile phone to a telephone exchange network
The mobile phone is located at
Location registration including the previously registered number at the time of registration
Sending a signal to the base station, which then detects the stolen mobile
A memory storing a telephone number, and
The advance included in the transmitted location registration signal
The registered number is stored in the memory and the stolen
To determine whether it matches the number of the mobile phone
Means, and the pre-registered number is
If it matches the number of the mobile phone that was difficult,
The registered number is the number of the stolen mobile phone
To the mobile phone,
The control unit performs predetermined key operations on the keyboard.
Was stolen or the previously registered number was stolen
The notification signal indicating that the number is a mobile phone number
When the switch is received, the switch is turned on, and the control unit
In addition, the mobile phone with the previously registered number stolen
Receiving the annunciation signal indicating that it is a telephone number
And disable the operation of the keyboard and the power key
The display of the display unit is turned off, and
Controlling the transmission of the alarm signal to the base station;
Receives the alarm signal and tracks the mobile phone.
A system for preventing theft of a mobile phone.