WO2012102164A1

WO2012102164A1 - Wireless lan terminal and method for preventing removal of same

Info

Publication number: WO2012102164A1
Application number: PCT/JP2012/051053
Authority: WO
Inventors: 鷲見　一行
Original assignee: シャープ株式会社
Priority date: 2011-01-26
Filing date: 2012-01-19
Publication date: 2012-08-02

Abstract

This wireless LAN terminal (1) comprises the following: a signal strength monitoring unit (2) that monitors whether the signal strength from a wireless LAN access point (30) falls below a prescribed threshold value, and generates a warning signal (Sar) when the signal strength falls below the prescribed threshold value; a warning generation unit (3) that emits a warning sound in accordance with the warning signal (Sar); a battery (5) that supplies power to the interior of the wireless LAN terminal (1); a power-supply switch (6) that can switch between an on-state where power is supplied to the interior of the wireless LAN terminal (1) from the battery (5) and an off-state where power supply is cut off; and a power supply for warning (5) that supplies power to the signal strength monitoring unit (2) and the warning generation unit (3) in at least a state where the power-supply switch (6) is off.

Description

Wireless LAN terminal and method for preventing carry-out thereof

The present invention relates to a wireless LAN terminal and a take-out prevention method, and more particularly to a technology for preventing a wireless LAN terminal connected to a wireless LAN access point by radio and used in a specific area from being taken out from the specific area.

As a technique for preventing taking out of a wireless LAN terminal used in a specific area, for example, a factory or an office, for example, a technique described in Patent Document 1 below is known. In Patent Document 1, the wireless LAN terminal monitors the radio wave intensity from the wireless LAN access point, and generates a warning signal when the wireless LAN terminal is taken out of a specific area and the radio wave intensity falls below a threshold value. A technique for requesting the user to input a user ID to the wireless LAN terminal in response to the warning signal and generating a warning sound when the user ID is not input or when an ID different from the user ID is input. Has been proposed.

JP 2008-219833 A

(Problems to be solved by the invention)
With the technique of the above-mentioned document, it is possible to suitably prevent the wireless LAN terminal from being taken out or stolen based on monitoring the radio field intensity from the wireless LAN access point. However, when the power switch of the wireless LAN terminal is turned off, there is a disadvantage that the radio wave intensity for preventing the carry-out cannot be monitored and a warning sound cannot be generated.

The present invention has been completed based on the above circumstances, and provides a technique capable of suitably preventing the wireless LAN terminal from being taken out even when the power switch of the wireless LAN terminal is turned off. Is.

(Means for solving problems)
In order to solve the above problems, a wireless LAN terminal of the present invention is a wireless LAN terminal connected wirelessly to a wireless LAN access point, and whether or not the radio wave intensity from the wireless LAN access point falls below a predetermined threshold value. A radio wave intensity monitoring unit that generates a warning signal when the radio wave intensity falls below the predetermined threshold, and a warning generation unit that emits a warning sound according to the warning signal from the radio wave intensity monitoring unit, A battery that supplies power to the inside of the wireless LAN terminal; a power switch that switches between an on state that turns on power supply from the battery to the inside of the wireless LAN terminal; and an off state that turns off power supply; and at least the power source And a warning power supply that supplies power to the radio field intensity monitoring unit and the warning generation unit when the switch is in an OFF state.

The wireless LAN terminal carry-out prevention method of the present invention is a wireless LAN terminal carry-out prevention method wirelessly connected to a wireless access point. The wireless LAN terminal includes a radio wave intensity monitoring unit, a warning generation unit, A battery, a power switch that switches between an on state for turning on the power supply from the battery to the inside of the wireless LAN terminal and an off state for turning off the power supply, and a warning power source. A monitoring step of monitoring whether or not the radio wave intensity from the wireless access point is below a predetermined threshold by an intensity monitoring unit, and generating a warning signal when the radio wave intensity is below the predetermined threshold; and generating the warning At least by the first warning step of emitting a warning sound according to the warning signal from the radio field intensity monitoring unit and the warning power supply. It said power switch and a supply step of supplying power to the radio wave intensity monitor unit and the warning generating unit in the off state.

According to each of the above configurations, even when the power switch of the wireless LAN terminal is in an off state, it is possible to supply power to the radio field intensity monitoring unit and the warning generation unit of the wireless LAN terminal. The warning generator can operate normally. Therefore, even when the power switch of the wireless LAN terminal is turned off, it is possible to suitably prevent the wireless LAN terminal from being taken out.

It should be noted that “supplying power to the radio wave intensity monitoring unit and the warning generating unit at least when the power switch is in an off state” means that “the radio wave intensity monitoring unit and the warning are at least in the off state of the power switch. Means that it is possible to supply power to the generator, and always means that power is always supplied to the radio wave intensity monitoring unit and the warning generator, at least when the power switch is off. do not do.

Further, in the wireless LAN terminal, in response to the switching operation of the power switch, a first power supply for controlling power supply from the battery to the inside of the wireless LAN terminal excluding the radio field intensity monitoring unit and the warning generation unit And, when the power switch is on, supplies power from the battery to the radio wave intensity monitoring unit and the warning generating unit, and at least when the power switch is off, the radio wave intensity monitoring unit and You may make it further provide the 2nd electric power feeding part which supplies electric power to the said warning generation | occurrence | production part.
In this case, when the power switch is on, power is supplied from the battery to the radio wave intensity monitoring unit and the warning generation unit. Therefore, the power capacity of the warning power supply can be reduced, and the warning power supply can be reduced in size.

In the wireless LAN terminal, switching is performed so that the second power feeding unit is connected to the battery when the power switch is on, and the second power feeding unit is connected to the warning power source when the power switch is off. The first power feeding unit may control the switching unit so that the second power feeding unit is connected to the battery when the power switch is on.
According to this configuration, when a battery and a warning power source are separately provided as power sources, the power source connected to the second power feeding unit is suitably switched by the first power feeding unit and the switching unit.

In the wireless LAN terminal and method, the radio wave intensity monitoring unit controls power supply from the warning power source to the warning generating unit, and the warning signal is output when the radio wave intensity falls below the predetermined threshold. You may make it permit the electric power supply from the power supply to the said alert generation part.
In this case, since no power is always supplied to the warning generation unit, the power supply for warning can be further reduced in capacity and size.

Further, in the above wireless LAN terminal and method, a power supply accommodating part for accommodating the battery and the warning power supply, a power supply cover covering the power supply accommodating part, and opening / closing of the power supply cover are detected to generate an opening / closing signal. A power lid sensor; and an ID input unit that inputs a power lid ID that permits opening and closing of the power lid. The radio wave intensity monitoring unit determines whether the power lid ID is input to the ID input unit. And determining whether or not the power lid ID is input and the power lid is opened based on the identification result of the power lid ID and the opening / closing signal, and the power lid ID is input. If it is determined that the power cover is opened, a warning sound may be generated in the warning generation unit.

In this case, a warning sound is generated even when the power cover is opened illegally in order to remove the battery or the power supply for warning from the wireless LAN terminal so that the warning sound does not sound. For this reason, even when the wireless LAN terminal is stolen by removing the battery or the warning power supply so that the warning sound for the radio wave intensity is not sounded, it is possible to suitably prevent the wireless LAN terminal from being taken out.

In the wireless LAN terminal and method, the battery may also serve as the warning power source. In this case, since it is not necessary to provide a warning power supply in the wireless LAN terminal separately from the battery, the number of parts of the wireless LAN terminal can be reduced and the wireless LAN terminal can be reduced in weight.

(The invention's effect)
According to the wireless LAN terminal and the carry-out prevention method of the present invention, it is possible to suitably prevent the wireless LAN terminal from being taken out even when the power switch of the wireless LAN terminal is turned off.

1 is a block diagram schematically showing an electrical configuration of a wireless LAN terminal according to a first embodiment. Graph showing the relationship between radio wave intensity and distance from LAN access point FIG. 3 is a block diagram schematically showing an electrical configuration of a wireless LAN terminal according to the second embodiment. FIG. 4 is a block diagram schematically showing an electrical configuration of a wireless LAN terminal according to a third embodiment. The block diagram which shows schematically the electric constitution of the wireless LAN terminal in another embodiment

<Embodiment 1>
Embodiment 1 of a wireless LAN terminal according to the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 is a block diagram schematically showing the electrical configuration of the wireless LAN terminal 1 according to the first embodiment. FIG. 2 shows the radio wave intensity Pw and the distance Dac from the access point in relation to the radio wave intensity threshold value Pth. It is a graph which shows the relationship. In the first embodiment, the wireless LAN terminal 1 is assumed to be a wireless handy terminal used in inventory work at a production site. The wireless LAN terminal is not limited to this, and may be a telephone terminal of a low-power wireless system, for example.

1. Configuration of Wireless LAN Terminal As shown in FIG. 1, the wireless LAN terminal 1 includes a radio wave intensity monitoring unit 2, a warning sound output unit 3, a speaker 4, a rechargeable battery 5, a power switch 6, a first power supply unit 7, and a first power supply unit 7. 2 including a power feeding unit 8 and connected to a wireless LAN access point 30 by a wireless LAN. In addition, the wireless LAN terminal 1 includes a charging circuit for the rechargeable battery 5, a memory for storing various data, for example, a display unit including a liquid crystal panel, various operation (input) keys, and the like, all not shown.

The radio field intensity monitoring unit 2 is configured by, for example, an ASIC (Application Specific IC), and monitors whether or not the radio field intensity Pw from the wireless LAN access point 30 is lower than a predetermined threshold value Pth. When the value falls below the threshold value Pth (see FIG. 2), a warning signal Sar is generated. The warning signal Sar is supplied to the warning sound output unit 3. The radio wave intensity monitoring unit 2 is not limited to being configured by an ASIC, and may be configured by, for example, a CPU that controls the entire wireless LAN terminal 1.

The warning sound output unit 3 and the speaker 4 constitute a warning generation unit. The warning sound output unit 3 generates a driving signal for the speaker 4 according to the warning signal Sar from the radio wave intensity monitoring unit 2, and the speaker 4 emits a warning sound according to the driving signal (corresponding to the first warning process).

Rechargeable battery (an example of a battery and a warning power supply) 5 supplies power to the inside of the wireless LAN terminal. In the first embodiment, the rechargeable battery 5 also serves as a warning power supply, and supplies power to the radio wave intensity monitoring unit 2 and the warning sound output unit (warning generation unit) 3 when the power switch 6 is in an on state and an off state. However, the present invention is not limited to this, and separately from the rechargeable battery 5, a warning power supply that supplies power to the radio wave intensity monitoring unit 2 and the warning sound output unit 3 when the power switch 6 is on and off, for example, a warning battery May be provided.

By the switching operation, the power switch 6 switches between an on state in which power supply is turned on from the rechargeable battery 5 to the inside of the wireless LAN terminal 1 and an off state in which power supply is turned off from the rechargeable battery 5 to the inside of the wireless LAN terminal 1. It is done. Specifically, here, the power supply switch 6 is turned on and off to supply power to each part of the wireless LAN terminal other than the radio wave intensity monitoring unit 2 and the warning sound output unit 3.

The first power supply unit 7 includes, for example, a changeover switch (not shown) that is interlocked with the on / off state changeover operation of the power switch 6. The first power supply unit 7 corresponds to the switching operation of the power switch 6 by a changeover switch, and the inside of the wireless LAN terminal excluding the radio wave intensity monitoring unit 2 and the warning sound output unit (warning generation unit) 3 from the rechargeable battery 5, For example, power supply to a memory or the like is controlled. That is, the first power feeding unit 7 feeds power to each part of the wireless LAN terminal other than the radio wave intensity monitoring unit 2 and the warning sound output unit 3 when the power switch 6 is on in conjunction with the switching operation of the power switch 6. On the other hand, when the power switch 6 is in the OFF state, power supply to other parts of the wireless LAN terminal other than the radio wave intensity monitoring unit 2 and the warning sound output unit 3 is stopped.

In addition, the second power supply unit 8 supplies power from the rechargeable battery 5 to the radio wave intensity monitoring unit 2 and the warning sound output unit 3 when the power switch 6 is in an on state, and the rechargeable battery ( The power is supplied from the warning power source 5 to the radio wave intensity monitoring unit 2 and the warning sound output unit 3. That is, the second power supply unit 8 is not linked to the switching operation of the power switch 6 and is always connected to the rechargeable battery 5, and the radio wave intensity from the rechargeable battery 5 regardless of the on / off state of the power switch 6. Power can be supplied to the monitoring unit 2 and the warning sound output unit 3. That is, in the first embodiment, power is always supplied from the rechargeable battery 5 to the radio wave intensity monitoring unit 2 and the warning sound output unit 3 regardless of the on / off state of the power switch 6. In other words, the rechargeable battery 5 can supply power to the radio wave intensity monitoring unit 2 and the warning sound output unit 3 at least when the power switch 6 is in an off state.

2. Carry-out prevention operation When the wireless LAN terminal 1 configured as described above is intentionally or carelessly taken out from an inventory site of a production factory, as shown in FIG. 2, the radio wave intensity Pw from the wireless LAN access point 30 is It decreases according to the distance Dac from the access point 30.

Therefore, when the distance Dac reaches the predetermined distance Dth from the access point 30, the radio wave intensity Pw falls below the predetermined threshold value Pth. Then, the radio wave intensity monitoring unit 2 generates a warning signal Sar and supplies the warning signal Sar to the warning sound output unit 3. The warning sound output unit 3 generates a speaker driving signal according to the warning signal Sar, and generates a warning sound that can be recognized by the owner of the wireless LAN terminal 1 and surrounding workers from the speaker 4 by the speaker driving signal.

At this time, not only when the power switch 6 of the wireless LAN terminal 1 is turned on, but also when the power switch 6 is turned off, the radio wave intensity monitoring unit 2 and the warning sound output unit 3 include a rechargeable battery. Power is supplied from 5 through the second power feeding unit 8. Therefore, even when the power switch 6 is turned off, a warning sound that can be recognized by the owner of the wireless LAN terminal 1 and the surrounding area is emitted from the speaker 4. The warning sound prevents the wireless LAN terminal 1 from being intentionally or carelessly taken out from the inventory site of the production factory.

3. As described above, in the first embodiment, even if the power switch 6 of the wireless LAN terminal 1 is in the off state, the radio wave intensity monitoring unit 2 and the warning sound output unit from the rechargeable battery (warning power source) 5. 3 is supplied with electric power, and the radio wave intensity monitoring unit 2 and the warning sound output unit 3 can operate normally. For this reason, even when the power switch 6 of the wireless LAN terminal 1 is turned off, a warning sound is emitted when the wireless LAN terminal 1 is taken out from a specific area of the wireless LAN terminal 1, for example, an inventory site of a production factory. 1 can be suitably prevented.

<Embodiment 2>
Next, Embodiment 2 will be described with reference to FIG. FIG. 3 is a block diagram schematically illustrating an electrical configuration of the wireless LAN terminal 1A according to the second embodiment. Note that differences from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The difference from the first embodiment is that power supply from the rechargeable battery 5 to the warning sound output unit 3 via the second power supply unit 8 is performed only when the radio wave intensity Pw falls below a predetermined threshold value Pth. . In other words, the radio wave intensity monitoring unit 2A needs to constantly monitor the radio wave intensity Pw, and therefore needs to be constantly fed. However, the warning sound output unit 3 may be supplied with power when a warning sound is generated, and the warning sound output unit 3 does not need to be supplied with power all the time. Therefore, in the second embodiment, the radio wave intensity monitoring unit 2A controls the power supply from the rechargeable battery (warning power source) 5 to the warning sound output unit 3, and the radio wave intensity Pw falls below a predetermined threshold value Pth. Only the power supply from the rechargeable battery 5 to the warning sound output unit 3 is permitted (corresponding to a control process).

Specifically, as shown in FIG. 3, for example, a power supply control switch 9 is provided between the second power supply unit 8 and the warning sound output unit 3. Then, the radio field intensity monitoring unit 2A turns on the power supply control switch 9 to permit power supply from the rechargeable battery 5 to the warning sound output unit 3 when the radio field intensity Pw falls below a predetermined threshold value Pth.

Thus, in the second embodiment, electric power is always supplied from the rechargeable battery 5 to the radio field intensity monitoring unit 2A via the second power supply unit 8 regardless of the on / off state of the power switch 6. On the other hand, the warning sound output unit 3 is not always supplied with power from the rechargeable battery 5, and it is necessary to generate a warning sound when the radio wave intensity Pw falls below a predetermined threshold value Pth regardless of the on / off state of the power switch 6. Power is supplied only at certain times.

Therefore, the power consumption of the rechargeable battery 5 can be reduced, and the discharge usage time of the rechargeable battery 5 can be extended. In particular, when the power switch 6 is in the off state, wasteful power consumption of the rechargeable battery 5 can be suppressed as compared with the case where the alarm sound output unit 3 is always supplied with power.

3 shows an example in which the power supply control switch 9 is configured separately from the radio wave intensity monitoring unit 2A. However, the configuration is not limited thereto, and the radio wave intensity monitoring unit 2A may include a power supply control switch. Good. Moreover, although the radio wave intensity monitoring unit 2A controls the power supply from the rechargeable battery 5 to the warning sound output unit 3 when the power switch 6 is on and off, the present invention is not limited to this. For example, the radio wave intensity monitoring unit 2A may control the power supply from the rechargeable battery 5 to the warning sound output unit 3 only when the power switch 6 is in an off state. That is, when the power switch 6 is in the ON state, the warning sound output unit 3 may be supplied with power regardless of the radio wave intensity Pw.

<Embodiment 3>
Next, Embodiment 3 will be described with reference to FIG. FIG. 4 is a block diagram schematically illustrating an electrical configuration of the wireless LAN terminal 1B according to the third embodiment. Note that differences from the first embodiment will be mainly described. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

4). Configuration of Wireless LAN Terminal According to Third Embodiment A wireless LAN terminal 1B according to the third embodiment further includes a power storage unit 12, a power cover 13, a power cover sensor 14, and an ID input unit 15.

The power supply accommodating unit 12 accommodates the rechargeable battery 5. The power supply cover 13 is a cover that covers the power supply housing 12 and is opened and closed when the rechargeable battery 5 is attached and detached. The power cover sensor 14 detects opening / closing of the power cover 13 and generates an open / close signal Soc corresponding to the opening / closing of the power cover 13. The open / close signal Soc is supplied to the radio wave intensity monitoring unit 2B. Here, the power cover sensor 14 is, for example, a mechanical or optical switch sensor that generates an on / off signal (open / close signal) in response to opening / closing of the power cover 13.

The ID input unit 15 is connected to, for example, a plurality of input keys, and the user ID of the user of the wireless LAN terminal 1B (an example of a power supply lid ID) is input to the ID input unit 15 from the plurality of input keys.

In the third embodiment, the radio wave intensity monitoring unit 2B performs an identification process of whether or not the ID input to the ID input unit 15 is a user ID, that is, whether or not the user ID is input to the ID input unit 15. .

Further, the radio wave intensity monitoring unit 2B determines whether or not the user ID is input and the power cover 13 is opened based on the identification result of the user ID and the open / close signal Soc, that is, after the user ID is input, the power cover 13 Whether or not can be opened. When it is determined that the power supply lid 13 has been opened without the user ID being input, the radio wave intensity monitoring unit 2B generates a warning signal Sar and causes the warning sound output unit 3 to generate a warning sound (second warning step). .

5. Actions and effects of Embodiment 3 In order to prevent a third party from intentionally taking out the wireless LAN terminal 1B having the above-described configuration from an inventory site of a production factory, a warning sound relating to radio wave intensity is not sounded. Assume that the power supply lid 13 is opened in order to remove the rechargeable battery 5 from the wireless LAN terminal. In that case, since the power supply lid 13 is opened without inputting the user ID, a warning sound is emitted from the speaker 4. That is, even when the power supply lid 13 is illegally opened, a warning sound is emitted. For this reason, even if a third party removes the rechargeable battery 5 and does not sound a warning sound for the radio wave intensity, the wireless LAN terminal 1B is taken out of the site, and the wireless LAN terminal 1B is taken out. It can prevent suitably.

It should be noted that not only a third party but also a user of the wireless LAN terminal 1B may be required to prevent the user himself / herself from intentionally taking the wireless LAN terminal 1B out of the production factory inventory site by removing the rechargeable battery 12. In that case, instead of the user ID, a specific power cover ID that permits opening and closing of the power cover is used as the power cover ID, and the power cover 13 can be opened and closed only by a specific worker or the like. Good.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In each of the above embodiments, the rechargeable battery 5 also serves as a warning power source, and at least the power switch 6 is in an off state, specifically, the radio wave intensity monitoring unit 2 and the warning when the power switch 6 is in an on / off state. Although the example which supplies electric power to the sound output part 3 was shown, it is not restricted to this. In each embodiment, a warning power source capable of supplying power to the radio wave intensity monitoring unit 2 and the warning sound output unit 3 may be provided separately from the rechargeable battery 5 at least when the power switch 6 is off. An example of a wireless LAN terminal provided with such a warning power supply is shown in FIG.

As shown in FIG. 5, the wireless LAN terminal 1 </ b> C further includes a warning power supply 21 and a switching unit 22. The switching unit 22 connects the second power feeding unit 8 to the rechargeable battery 5 when the power switch 6 is on, and connects the second power feeding unit 8 to the warning power source 21 when the power switch 6 is off. In this configuration, for example, the first power feeding unit 7 controls the switching unit 22 so that the second power feeding unit 8 is connected to the rechargeable battery 5 when the power switch 6 is in the on state. Note that the switching control of the switching unit 22 is not limited to being performed by the first power feeding unit 7.

Thus, when the rechargeable battery 5 and the warning power supply 21 are provided separately as power supplies, the power supply connected to the second power supply section 8 is suitably switched by the first power supply section 7 and the switching section 21. In addition, when the power switch 6 is in the off state, the power supply from the rechargeable battery 5 is stopped, so that the discharge use time of the rechargeable battery 5 can be extended. The warning power supply 21 is also preferably a rechargeable battery and is provided in the power supply accommodating portion 12 (see FIG. 4).

(2) In each of the embodiments described above, an example in which the first supply unit 7 and the second supply unit 8 are provided has been described, but the first supply unit 7 and the second supply unit 8 may be omitted. In this case, the radio wave intensity monitoring unit 2 and the warning sound output unit 3 are directly supplied with power from the rechargeable battery 5 or the warning power source 21 without using the power switch 6. In addition, power may be supplied from the rechargeable battery 5 to the other parts of the terminal other than the radio wave intensity monitoring unit 2 and the warning sound output unit 3 via the power switch 6. In short, it is sufficient that power supply from the rechargeable battery (warning power source) 5 to the radio wave intensity monitoring unit 2 and the warning sound output unit 3 can be made at least when the power switch 6 is in an off state. According to this configuration, even when the power switch 5 of the wireless LAN terminal 1 is turned off, a warning sound is emitted when the radio wave intensity Pw falls below the threshold value Pth. It can prevent suitably.

(3) Also in the first and third embodiments and the other embodiments described above, as shown in the second embodiment, the radio wave intensity monitoring unit 2 is configured to charge the rechargeable battery 5 when the radio wave intensity Pw falls below a predetermined threshold value Pth. Alternatively, power supply from the warning power supply 21 to the warning sound output unit 3 may be permitted. At that time, as shown in FIG. 3, a power supply control switch 9 may be provided between the second power supply unit 8 and the warning sound output unit 3.

DESCRIPTION OF

SYMBOLS

1,1A, 1B, 1C ... Wireless LAN terminal, 2, 2A, 2B ... Radio wave intensity monitoring part, 3 ... Warning sound output part (warning sound generation part), 4 ... Speaker (warning sound generation part), 5 ... Rechargeable battery (Battery, power supply for warning), 6 ... power switch, 7 ... first power supply unit, 8 ... second power supply unit, 12 ... power supply housing unit, 13 ... power supply lid, 14 ... power supply lid sensor, 15 ... ID input unit, 21 ... Warning battery (warning power supply), 22 ... Switching section

Claims

A wireless LAN terminal connected wirelessly to a wireless LAN access point,
A radio field intensity monitoring unit that monitors whether the radio field intensity from the wireless LAN access point is below a predetermined threshold, and generates a warning signal when the radio field intensity is below the predetermined threshold;
A warning generating unit that emits a warning sound according to the warning signal from the radio wave intensity monitoring unit;
A battery for supplying power to the inside of the wireless LAN terminal;
A power switch capable of switching between an on state for turning on power supply from the battery to the inside of the wireless LAN terminal and an off state for turning off power supply;
At least when the power switch is off, a warning power supply that supplies power to the radio field intensity monitoring unit and the warning generation unit;
Wireless LAN terminal equipped with.
In response to the switching operation of the power switch, a first power feeding unit that controls power supply from the battery to the inside of the wireless LAN terminal excluding the radio wave intensity monitoring unit and the warning generating unit;
When the power switch is on, power is supplied from the battery to the radio wave intensity monitoring unit and the warning generating unit, and at least when the power switch is off, the radio wave intensity monitoring unit and the warning are generated from the warning power source. A second power supply unit that supplies power to the unit;
The wireless LAN terminal according to claim 1, comprising:
The radio field intensity monitoring unit controls power supply from the warning power source to the warning generation unit, and when the radio field intensity falls below the predetermined threshold, power supply from the warning power source to the warning generation unit The wireless LAN terminal according to claim 1, wherein the wireless LAN terminal is permitted.
A power supply accommodating portion for accommodating the battery and the warning power supply;
A power lid that covers the power supply housing; a power lid sensor that detects opening and closing of the power lid and generates an opening and closing signal;
An ID input unit for inputting a power cover ID that permits opening and closing of the power cover;
The radio field intensity monitoring unit performs identification processing as to whether or not the power supply lid ID is input to the ID input unit, and the power supply lid ID is input based on the identification result of the power supply lid ID and the open / close signal. And determining whether or not the power cover is opened, and if it is determined that the power cover is opened without inputting the power cover ID, a warning sound is generated in the warning generation unit. The wireless LAN terminal according to claim 3.
The wireless LAN terminal according to any one of claims 1 to 4, wherein the battery also serves as the warning power source.
A switching unit for connecting the second power feeding unit to the battery when the power switch is on, and for connecting the second power feeding unit to the warning power source when the power switch is off;
The wireless LAN terminal according to claim 2, wherein the first power supply unit controls the switching unit so that the second power supply unit is connected to the battery when the power switch is on.
A wireless LAN terminal take-out prevention method connected wirelessly to a wireless access point, wherein the wireless LAN terminal includes a radio wave intensity monitoring unit, a warning generation unit, a battery, and the battery to the inside of the wireless LAN terminal. A power switch capable of switching between an on state for turning on the power supply and an off state for turning off the power supply, and a warning power source, the method comprising:
A monitoring step of monitoring whether or not the radio wave intensity from the wireless access point is below a predetermined threshold by the radio wave intensity monitoring unit, and generating a warning signal when the radio wave intensity is below the predetermined threshold;
A first warning step of emitting a warning sound according to the warning signal from the radio wave intensity monitoring unit by the warning generation unit;
A supply step of supplying power to the radio field intensity monitoring unit and the warning generation unit at least when the power switch is in an off state by the warning power source;
A method for preventing take-out of wireless LAN terminals including
A control step of controlling power supply from the warning power source to the warning generation unit by the radio wave intensity monitoring unit, wherein the warning is generated from the warning power source when the radio field intensity falls below the predetermined threshold The wireless LAN terminal take-out prevention method according to claim 7, further comprising a control step of permitting power supply to the unit.
The wireless LAN terminal includes a power storage unit that stores the battery and the warning power source, a power cover that covers the power storage unit, a power cover sensor that detects opening / closing of the power cover and generates an open / close signal An ID input unit for inputting a power cover ID that permits opening and closing of the power cover, and the method includes:
An identification step of performing identification processing as to whether or not the power supply lid ID has been input to the ID input unit;
A determination step of determining whether the power supply lid ID is input and the power supply lid is opened based on the identification result of the power supply lid ID and the opening / closing signal;
The determination step further includes a second warning step of generating a warning sound by the warning generation unit when it is determined that the power supply lid is opened without the input of the power supply lid ID. Item 9. The wireless LAN terminal takeout prevention method according to Item 8.
The wireless LAN terminal take-out prevention method according to any one of claims 7 to 9, further comprising using the battery also as the warning power source.