JP2000259274A - Theft prevention system for terminal device - Google Patents

Theft prevention system for terminal device

Info

Publication number
JP2000259274A
JP2000259274A JP11060828A JP6082899A JP2000259274A JP 2000259274 A JP2000259274 A JP 2000259274A JP 11060828 A JP11060828 A JP 11060828A JP 6082899 A JP6082899 A JP 6082899A JP 2000259274 A JP2000259274 A JP 2000259274A
Authority
JP
Japan
Prior art keywords
alarm
ac adapter
terminal device
network
disconnected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP11060828A
Other languages
Japanese (ja)
Inventor
Hiromi Matsushita
洋美 松下
Original Assignee
Nec Corp
日本電気株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Corp, 日本電気株式会社 filed Critical Nec Corp
Priority to JP11060828A priority Critical patent/JP2000259274A/en
Publication of JP2000259274A publication Critical patent/JP2000259274A/en
Application status is Pending legal-status Critical

Links

Abstract

(57) [Problem] In a conventional terminal device theft prevention method, an alarm may be generated even when a power failure or a power cord is disconnected, which is inconvenient for a user. When an alarm output is permitted, that is, when an alarm output state flag is on, it is confirmed whether or not power is being supplied from an AC adapter. If it is recognized that there is a possibility that the AC adapter is disconnected, it is checked whether the timeout flag is on. The time when the timeout flag is ON means that the data reception wait timer has timed out after sending the data of the destination to the LAN, and the personal computer may be disconnected from the LAN. If the time-out flag is on, an alarm output instruction signal is output to the power supply circuit. The power supply circuit sounds a buzzer according to the alarm output instruction signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal equipment anti-theft system for preventing theft of a notebook personal computer or the like.

[0002]

2. Description of the Related Art In offices, portable terminal devices such as notebook personal computers are widely used. These devices are small, lightweight and easy to carry, so they are susceptible to unauthorized removal or theft. Therefore, prevention of unauthorized removal and theft has become a major issue.

As a conventional anti-theft system for a notebook personal computer, there is a system disclosed in Japanese Patent Application Laid-Open No. 6-75652. In general, a laptop personal computer has a built-in battery and receives power supply via an AC adapter. Therefore, in the method described in the above publication, when it is detected that the AC adapter has been removed from the main body of the notebook personal computer,
Notify the surroundings of unauthorized removal by generating an alarm sound.

Japanese Patent Application Laid-Open Publication No. Hei 7-334337 describes a system for preventing the theft of a personal computer in a system in which a monitoring server and each personal computer are connected to a network.
In that method, the monitoring server sends a message to each personal computer at regular intervals, and each personal computer returns a response message to the monitoring server upon receiving the message. When the monitoring server detects that a certain personal computer does not return a response message more than a specified number of times, it sends an alarm message to all the personal computers that theft has occurred. The personal computer that has received the alarm message notifies the surroundings of unauthorized removal of a certain personal computer by displaying an alarm.

[0005]

SUMMARY OF THE INVENTION However, Japanese Patent Laid-Open No.
In the method described in Japanese Patent No. 75652, an alarm is issued even when the user disconnects the AC adapter from the personal computer for some reason. Therefore, the system is configured to be able to switch between an alarm output permission state and an alarm output inhibition state. That is, a menu is displayed on the personal computer in accordance with a predetermined operation, and the user can perform switching setting according to the menu. Thus, the user simply needs to
When it is desired to remove the adapter, the alarm output is prohibited according to the displayed menu, and then the AC adapter is removed to prevent the alarm from being generated.

However, if the switching operation between the alarm output permission state and the alarm output prohibition state is released to the user, the effect of preventing unauthorized removal is reduced by half. Therefore, in an actual operation, for example, by using a password, only the administrator can perform the switching operation between the alarm output permission state and the alarm output inhibition state. Then simply A
If the user wants to remove the C adapter, the user must ask the administrator to perform an operation to release the alarm output permission state. Since such a request is troublesome and the manager may be absent, the user cannot practically use the personal computer without the AC adapter.

[0007] Further, even when a power failure or disconnection of a power cord occurs, an alarm may be generated, resulting in a user-friendly environment.

[0008] According to the method described in Japanese Patent Application Laid-Open No. 7-334437, a user can use a personal computer without the AC adapter. Further, no alarm is issued even when a power failure or a power cord disconnection occurs. However, in such a method, the existence of a monitoring server is essential. Then, it is impossible to prevent a personal computer connected by a simple network without a server from being stolen.

Accordingly, an object of the present invention is to provide a terminal device theft prevention system capable of preventing the theft of a portable device in a simple system without impairing the usability of the portable device. I do.

[0010]

SUMMARY OF THE INVENTION An anti-theft system according to the present invention comprises an AC adapter non-connection detecting means for detecting that an AC adapter may be disconnected and a terminal device not being connected to a network. Network disconnection detecting means for detecting the possibility that the AC adapter is disconnected, and the possibility that the terminal device is not connected to the network. Alarm generating means for generating an alarm when the network disconnection detecting means detects that there is an alarm. According to such a configuration, AC
Since the alarm is not issued only when the power cord of the adapter is disconnected, the usability of the user can be improved.

The network disconnection detecting means is configured to transmit data addressed to the terminal to the network and, when the data cannot be received, determine that the terminal device may not be connected to the network. Is also good. According to such a configuration, an anti-theft system can be constructed without a server or the like for controlling each terminal device.

[0012] The AC adapter non-connection detecting means may be configured to determine that the AC adapter may be disconnected when the output voltage of the AC adapter falls below a predetermined value. According to such a configuration, disconnection of the AC adapter, which is one of the conditions for generating an alarm, can be easily detected.

The anti-theft system further includes:
An alarm that sets the alarm generating means to the operating state when a signal for enabling the alarm output is received from an external input means, and sets the alarm generating means to the operating disabled state when a signal for disabling the alarm output is received. Generation control means may be provided. In the case where such an alarm generation control means is provided, the switching operation between the alarm output permission state and the alarm output inhibition state is not released to the user, and the administrator or the like can easily switch. .

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an example of the internal configuration of a notebook personal computer according to an embodiment of the present invention, together with an input device. As shown in FIG. 1, inside a notebook personal computer, a CPU 11 for performing processing based on a program, a ROM 12 for storing fixed data such as a BIOS, and a RAM 13 used as a work area are connected via a bus 30. .

Also, a hard disk 41 is connected to the bus 30 via the hard disk interface unit 14,
The LAN interface unit 15 is connected to the bus 30. Further, a light emitting element / light receiving element 42 is connected to the bus 30 via the IrDA interface section 16 and a liquid crystal panel 43 is connected via the display interface section 17.

A control signal to the power supply circuit 19 and a detection signal from the power supply circuit 19 are transmitted to the power supply circuit interface unit 19.
Is input / output to / from the bus 30 via the external device interface unit 18, and other peripheral devices are connected to the bus 30 via the peripheral device interface unit 18.

The power supply circuit interface unit 19
/ O port, the control signal to the power supply circuit 19 is an alarm output instruction signal, and the detection signal from the power supply circuit 19 is AC
This is a voltage detection signal that is a result of detecting the output voltage of the adapter. The peripheral device interface unit 18 includes, for example, a keyboard interface and a USB interface.

As shown in FIG. 2, notebook personal computers 100 and 200 are connected to LAN 300. Note that the notebook personal computer 100,
Inside 200, CPU 11 transmits and receives data to and from LAN 300 via LAN interface unit 15.

FIG. 3 is a block diagram showing the configuration of the power supply circuit 50 together with the AC adapter 60, the battery 70, and the buzzer 80. The battery 70 and the buzzer 80
It is built into notebook personal computers. In the power supply circuit 50, the power supply switching / charging circuit 51 normally supplies power from the AC adapter 60 to each section of the notebook personal computer and charges the battery 70. When the AC adapter 60 is not connected, the power from the battery 70 is supplied to each section of the notebook personal computer. The power supply switching / charging circuit 51 includes a DC-DC converter.

The voltage detection circuit 52 detects the output voltage of the AC adapter 60 and transmits the detection result to the CPU 11 via the power supply circuit interface unit 19. For example, if the output voltage standard value of the AC adapter 60 is +19 V, a detection result indicating that there is no output voltage is output when the output voltage becomes about 50% or less of +19 V. Further, the alarm generation circuit 53
When an alarm output instruction signal is received from the PU 11 via the power supply circuit interface unit 19, a drive current based on the signal is supplied to the buzzer 80.

In this embodiment, the AC adapter disconnection detecting means is realized by the voltage detecting circuit 52 and a program executed by the CPU 11, and the network non-connecting detecting means is realized by a LAN interface and a program executed by the CPU 11. Have been. The alarm generation means is C
The program is executed by the PU 11, the alarm generation circuit 53 and the buzzer 80. The alarm generation control means is realized by an IrDA interface, a program executed by the CPU 11, and the like.

Next, an alarm generation process for preventing theft will be described with reference to the flowcharts of FIGS.
FIG. 4 shows an infrared signal receiving process for receiving an infrared signal from the input device 90 via the IrDA interface unit 16. FIG. 5 shows that the signal for the anti-theft control is L
A signal transmission / reception process for transmitting a signal to the AN 300 and receiving a signal from the LAN 300 is shown. FIG. 6 shows an alarm output determination process.

In this embodiment, the input device 90 is an infrared remote control unit. The administrator sets the personal computer in the alarm output permission state by transmitting a code for setting the alarm output permission state from the input device 90. Further, the personal computer is set to the alarm output prohibition state by transmitting a code for setting the alarm output prohibition state.

In the infrared signal receiving process, the CPU 11
Recognizing that the infrared signal has been received via the IrDA interface unit 16 (step S11), confirms whether the received signal is a signal including a code for enabling the alarm output (step S12). . If there is a code for enabling the alarm output, the alarm output state flag is turned on (step S13).

If the received signal is a signal including a code for disabling the alarm output (step S1).
4) Turn off the alarm output state flag (step S1)
5). If the received signal does not include the code for enabling the alarm output and does not include the code for enabling the alarm output, another process is performed (step S1).
6).

The CPU 11 of the personal computer
During operation, a signal for alarm output processing is always sent to the LAN 300. As shown in FIG. 5, the signal to be transmitted is data addressed to itself (step S21).
When the signal is sent, the monitoring timer is started (step S22). Note that the signal for the alarm output process may simply be a signal with specific data.

Then, monitoring of the monitoring timer and monitoring of signal reception are performed. When the self-transmitted signal for the alarm output process is received (step S25), the timeout flag is turned off (step S26). If the monitoring timer times out before the signal is received (step S23), the timeout flag is turned on (step S23).
24).

When the time-out flag is ON, it means that a signal for the alarm output processing directed to itself is not received for a predetermined time or more. In this case, it can be recognized that the personal computer may be disconnected from the LAN 300. Even if the timeout flag is turned on, the timeout flag is turned off if reception based on the next signal transmission can be performed. Therefore, even if a data error or the like occurs temporarily, the LAN 300
It will not be mistakenly recognized as being disconnected from.

Further, if the timer value of the monitoring timer is set to be longer, or if a timeout occurs a plurality of times, the timeout flag is turned on, so that the user temporarily disconnects the line to the LAN 300 for some reason. Even if it does, the timeout flag can be prevented from being turned on.

FIG. 6 is a flowchart showing a process for determining whether or not to generate an alarm. In that process, C
The PU 11 first checks whether or not the alarm output is permitted (step S31). Specifically, it is checked whether the alarm output state flag is on.

When the alarm output state flag is on, it is checked whether or not the power is being supplied from the AC adapter 60 (step S32). Power supply circuit 50
By checking the voltage detection signal from the voltage detection circuit 52, whether or not power is supplied from the AC adapter 60 can be confirmed. When power is not supplied from the AC adapter 60, it can be recognized that the AC adapter 60 may be disconnected.

When recognizing that there is a possibility that the AC adapter 60 has been disconnected, the CPU 11 checks whether the timeout flag is on (step S3).
3). As described above, when the timeout flag is ON, the personal computer
It is possible that they may be disconnected from

If the timeout flag is on, C
The PU 11 outputs an alarm output instruction signal to the power supply circuit 50. In the power supply circuit 50, the alarm generation circuit 53
Receives a warning output instruction signal, applies a drive current to the buzzer 80, and sounds the buzzer. The sound of the buzzer 80 is continued until the capacity of the battery 70 is exhausted. Or, FIG.
As shown in (5), when the alarm output state flag is turned off, the power is re-supplied from the AC adapter 60, or the timeout flag is turned off (steps S35, S36, S37),
The CPU 11 turns off the alarm output instruction signal and stops the buzzer 80 from sounding.

As described above, in this embodiment, when the alarm output permission state is set, the AC adapter 6
0 may have been removed and the personal computer may have been disconnected from the LAN 300,
An alarm is issued via the buzzer 80. Therefore, unlike the conventional anti-theft system, the AC adapter 60 cannot be practically removed, so that the operability is not hindered.

The CPU 11 controls the alarm generation.
Transmits a signal to its own destination via the LAN 300,
The anti-theft system described above can be constructed without a server or the like. That is, in a simple system, the personal computer can be prevented from being stolen.

In the office, when a terminal device is equipped with an anti-theft system, malfunctions become a problem. In other words, if the alarm is issued without the user intending to take the device illegally, the user may be distrusted by the administrator. However, in the above embodiment, simply removing the AC adapter also
Since no alarm is issued simply by disconnecting the personal computer from the network, such distrust is prevented.

In the above embodiment, the administrator can easily switch between the alarm output permission state and the alarm output inhibition state by using the infrared remote control unit. Therefore, the administrator can easily switch between the alarm output permission state and the alarm output inhibition state without releasing the operation to the user. In addition, even if the administrator is not present, the sub-administrator or the like can easily switch using the infrared remote control unit. The infrared remote control unit is an input device 9
0 is merely an example, and does not release the switching operation between the alarm output permission state and the alarm output inhibition state to the user, and
Other input means may be used as long as the administrator can easily switch.

Further, in the above embodiment, the buzzer 80 is exemplified as the alarm generating means, but other means may be used. For example, sound may be output from another built-in sound source of a personal computer such as an FM sound source or a MIDI sound source. Further, the alarm may be generated by other means such as a visible means instead of an audible means.

In the above embodiment, a notebook personal computer is used as an example of a terminal device.
The present invention can be applied to other terminal devices as long as they can be connected to an AC adapter and can be connected to a network.

[0040]

As described above, according to the present invention, the terminal device theft prevention system detects that the AC adapter may be disconnected and may not be connected to the network. Since an alarm is generated when it is detected that the portable device is available, there is an effect that the theft of the portable device can be prevented in a simple system without hindering the usability of the portable device.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an example of an internal configuration of a notebook personal computer according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a network connection example of a personal computer.

FIG. 3 is a block diagram illustrating a configuration of a power supply circuit.

FIG. 4 is a flowchart showing an infrared signal receiving process.

FIG. 5 is a flowchart showing a signal transmission / reception process for transmitting a signal for anti-theft control to the LAN and receiving the signal from the LAN.

FIG. 6 is a flowchart illustrating an alarm output determination process.

[Explanation of symbols]

 Reference Signs List 11 CPU 12 ROM 13 RAM 14 Hard disk interface unit 15 LAN interface unit 16 IrDA interface unit 17 Display interface unit 18 Peripheral device interface unit 19 Power supply circuit interface unit 30 Bus 41 Hard disk 42 Light emitting element / light receiving element 43 Liquid crystal panel 50 Power supply circuit 51 Power supply Switching / charging circuit 52 Voltage detection circuit 53 Alarm generation circuit 60 AC adapter 70 Battery 80 Buzzer 100, 200 Personal computer 300 LAN

Claims (4)

    [Claims]
  1. An AC adapter is connectable, and
    In an anti-theft system that prevents theft of terminal devices that can be connected to a network, AC adapter non-connection detection means for detecting that an AC adapter may be disconnected, and that the terminal device may not be connected to the network Network disconnection detecting means for detecting that there is a possibility that the AC adapter is disconnected, and wherein the network disconnection detecting means detects that the AC adapter may be disconnected. An alarm generating means for generating an alarm when detecting that there is a possibility that the device is not connected to the terminal device.
  2. 2. The network disconnection detecting means sends data addressed to the terminal to the network and, when the data is not received from the network, determines that the terminal device may not be connected to the network. 1. The terminal device theft prevention system according to 1.
  3. 3. The terminal device theft prevention system according to claim 2, wherein the AC adapter non-connection detecting means determines that the AC adapter may be disconnected when the output voltage of the AC adapter falls below a predetermined value.
  4. 4. When an alarm output permitting signal is received from an external input means, the alarm generating means is set to an operating state, and when a signal for disabling the alarm output is received, the alarm generating means is disabled. 4. The terminal device theft prevention system according to claim 1, further comprising an alarm generation control means for setting a state.
JP11060828A 1999-03-08 1999-03-08 Theft prevention system for terminal device Pending JP2000259274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11060828A JP2000259274A (en) 1999-03-08 1999-03-08 Theft prevention system for terminal device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11060828A JP2000259274A (en) 1999-03-08 1999-03-08 Theft prevention system for terminal device

Publications (1)

Publication Number Publication Date
JP2000259274A true JP2000259274A (en) 2000-09-22

Family

ID=13153618

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11060828A Pending JP2000259274A (en) 1999-03-08 1999-03-08 Theft prevention system for terminal device

Country Status (1)

Country Link
JP (1) JP2000259274A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008053807A1 (en) * 2006-10-30 2008-05-08 Nec Display Solutions, Ltd. Network projector and projector system
JP2009199506A (en) * 2008-02-25 2009-09-03 Nec Corp Theft prevention device
US8906114B2 (en) * 2001-06-07 2014-12-09 Agere Systems Llc Method and apparatus for protecting a device connected to a network

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8906114B2 (en) * 2001-06-07 2014-12-09 Agere Systems Llc Method and apparatus for protecting a device connected to a network
WO2008053807A1 (en) * 2006-10-30 2008-05-08 Nec Display Solutions, Ltd. Network projector and projector system
US8286259B2 (en) 2006-10-30 2012-10-09 Nec Display Solutions, Ltd. Network projector including a display signal control unit, and projector system including the network projector
JP2009199506A (en) * 2008-02-25 2009-09-03 Nec Corp Theft prevention device

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