JP3976050B2 - Wireless terminal device and cordless telephone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable positively determining power failure of an external power source to turn on illumination, irrespective of whether or not a radio terminal device is connected to a charger, in the radio terminal device capable of radio communication with a master set, and to realize the above at a low cost. <P>SOLUTION: A control unit 61 of a slave set 50 determines the presence or absence of voltage supply from a charger 80 for supplying charging voltage while directly receiving power supply from a commercial power source 90, on the basis of a charging voltage detected by a voltage monitoring unit 77. When determining that the voltage is not supplied, the control unit 61 transmits a request of connection with a telephone line network 100 to a master set 10 operating while directly receiving power supply from the commercial power source 90. When a response cannot be received from the master set 10, the control unit 61 judges that the communication with the master set 10 is impossible, and determines that the commercial power source 90 is in failure. <P>COPYRIGHT: (C)2006,JPO&amp;NCIPI

Description

  The present invention relates to a wireless terminal device of a cordless telephone system that can be used as an emergency light during a power failure.

  Conventionally, a main unit that is connected to a telephone line and operates by receiving power directly from an external power source, a charger that directly receives power from an external power source and supplies power for charging, and is connected to the charger. In a cordless telephone system that includes a battery that is charged with power supplied from the charger and that is operated by the power charged in the battery, wireless communication is performed with the parent machine. A slave unit that is connected to a telephone line is known. However, in this child device, for example, when a power failure occurs at night, it is difficult to confirm the position of the child device.

Therefore, as a method for solving the above problem, the slave unit is equipped with an illumination, and the charging voltage supplied from the charger is observed to be lowered gently or suddenly with a built-in microcomputer, and the charging voltage is observed. If it is determined that the power supply has gradually decreased, it is determined that the external power supply has failed, and a method of turning on the illumination to indicate the position of the slave unit has been proposed (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-207118

  However, in the proposed method, it is necessary for the microcomputer to read the voltage value at a high speed in order to determine whether the charging voltage has dropped gently or suddenly. For this reason, there is a problem that a CPU that operates at a high speed is necessary and the cost is increased. Further, since the charging voltage does not change when the slave unit is removed from the charger, it is not possible to determine whether or not there is a power failure, and the lighting cannot be turned on.

  The present invention has been made in view of such problems, and in a wireless terminal device capable of wireless communication with a parent device, whether or not the wireless terminal device is connected to a charger is reliably determined whether or not a power failure is caused by an external power supply. Thus, it is possible to turn on the illumination and to realize at low cost.

  The invention according to claim 1, which has been made to achieve such an object, provides power supply from this charger when connected to a charger that receives power directly from an external power source and supplies power for charging. A wireless terminal device that has a built-in battery that is received and charged, and that operates with power charged in the battery, and performs wireless communication with a parent device that operates by receiving power directly from the external power supply Means, power supply detection means for detecting presence / absence of power supply from the charger, and when the power supply detection means detects that there is no power supply from the charger, the base unit via the communication means A power failure determination means for determining that the external power supply is out of power when communication is not possible as a result, and the external power supply is interrupted by the power failure determination means. Determined When, characterized in that and a lighting control means for lighting the illuminating means.

  Thus, when the wireless terminal device of the present invention is connected to a charger that directly receives power from an external power source and supplies power for charging, the battery that is charged by receiving power from the charger is charged. Is built in and operates with the power charged in this battery. The communication means performs wireless communication with the main unit that operates by receiving power supply directly from an external power source. Detect the presence of power supply from the instrument. Then, when there is no power supply, the power failure determination means determines whether or not communication with the parent device is possible by the communication means, and if the communication is not possible as a result, the external power supply has failed. The lighting control means turns on the lighting means.

  That is, according to the wireless terminal device according to claim 1, when power is not supplied from the charger, it is determined whether or not communication with the parent device is possible. Since the determination is made, it is possible to reliably determine the power failure even when not connected to the charger and to turn on the illumination means, and since a high-speed CPU is not required to determine the power failure, the cost is low. Can be realized.

  Next, in the wireless terminal device according to claim 1, when the power supply detection unit detects that no power is supplied from the charger, the communication unit calls the parent device. When it is configured to send a connection request to the line and communicate with the other communication terminal via the master unit, and the power failure determination means cannot receive a response from the master unit after sending the connection request In addition, it may be determined that communication with the parent device is not possible, and it may be determined that the external power supply has failed.

  In this way, it is possible to connect to the telephone line by wireless communication with the base unit, and when there is no power supply from the charger, a connection request for connecting to the telephone line is automatically sent to the base unit. Because it transmits, it can be connected to the telephone line when the external power supply is not out of power, and when the external power supply is out of power, the base unit does not respond to the connection request, so the response from the base unit cannot be received. Instead, it can be determined that a power failure has occurred and the illumination means can be turned on.

  Moreover, when the wireless terminal device according to claim 1 or 2 is placed on a charging stand on which the wireless terminal device can be placed as described in claim 3, the wireless terminal device is The built-in battery is configured to be charged by receiving power supply, and is provided with a placement detection means for detecting whether or not the battery is placed on the charging stand, and the power failure detection means is charged by the power supply detection means. Based on the detection that there is no power supply from the stand, the detection that the wireless terminal device is placed on the charging stand by the placement detection means, and the determination that communication with the base unit is not possible You may make it determine with the power supply having failed.

  That is, in the wireless terminal device according to claim 1 or 2, if the power failure determination means detects that there is no power supply from the charging stand, is the power failure caused by wireless communication with the master unit? For example, if the wireless terminal device is removed from the charging stand and placed in a place where wireless communication with the parent device is not possible, it is determined that a power failure has occurred and the illumination means is turned on. This may cause waste of power.

  Therefore, in the case where it is only necessary to turn on the illumination means when the wireless terminal device is placed on the charging stand, the power supply from the charging stand is not provided, for example, according to claim 3, Even if wireless communication is not possible due to obstacles, etc. between the base unit and the wireless terminal device, if it is not placed on the charging stand, it is determined that there is no power failure, so the power failure is more reliable. The lighting means can be turned on only during a power failure.

  When the power failure detection means of the wireless terminal device according to claim 3 detects that there is no power supply from the charging stand by the power supply detection means as described in claim 4, It is determined whether or not communication with the parent device is possible, and if communication is not possible as a result, whether or not the placement detection means detects that the wireless terminal device is placed on the charging stand. If it is detected that the external power source is mounted, it may be determined that the external power source is out of power.

  In other words, when the illumination means only needs to be turned on when the wireless terminal device is placed on the charging stand, in this way, it is finally determined whether or not it is placed on the charging stand. Therefore, the placement detection means can be used as an additional element for more reliably determining whether there is a power failure, and when there is a voltage supply from the charging stand, or can communicate with the master unit. In some cases, since it is immediately determined that there is no power failure, the time required for power failure determination can be shortened.

  Furthermore, the power failure determination means of the wireless terminal device according to claim 3 is configured to detect the power supply from the charging base when the power supply detection means detects that no power is supplied from the charging stand. It is determined whether or not it is detected that the wireless terminal device is placed on the charging stand. If it is detected that the wireless terminal device is placed on the charging stand, the wireless terminal device can communicate with the parent device via the communication means. If it is determined that the external power supply is out of power without determining whether communication is possible, and if it is not detected that it is mounted, It may be determined whether communication is possible, and if communication is not possible, it may be determined that the external power supply has failed.

  In this way, when it is detected that there is no power supply from the charging stand and it is detected that it is placed on the charging stand, it is immediately determined that a power failure has occurred and only when it is not placed on the charging stand. When communication is not possible, it is determined that a power failure has occurred. Therefore, processing for determining a power failure can be reduced.

  On the other hand, in the wireless terminal device according to any one of claims 1 to 5, when the illumination control unit determines that the external power source has a power failure by the power failure determination unit as described in claim 6, It may be determined from the amount of power stored in the battery whether or not the lighting means can be turned on, and when the lighting means can be turned on as a result, the lighting means may be turned on.

  If it does in this way, when the electric energy stored in the battery is small, it is possible to prevent the lighting means from being turned on, and it is possible to leave the power that can be communicated immediately after the power failure is restored.

  And the radio | wireless terminal apparatus in any one of Claims 1-6 is an identification number for distinguishing from the other radio | wireless terminal apparatus which carries out radio | wireless communication with the same main | base station like Claim 7. Is set, and it is determined by the power failure determination means that the external power supply is out of power, it is determined whether this identification number is an identification number for which lighting of the illumination means is permitted. If the identification number is permitted to turn on the means, a first illumination permission means for permitting the operation of the illumination control means may be provided.

  In other words, in the event of a power outage, the illumination means of all wireless terminal devices that wirelessly communicate with the same base unit may be turned on, but in this way, it is possible to turn on only the illumination means of the wireless terminal device that has been set in advance. Therefore, power consumption can be reduced, and a wireless terminal device that can make a call immediately after the power failure is restored can be secured.

  Moreover, the wireless terminal device according to any one of claims 1 to 7, as described in claim 8, determines whether or not the illumination unit of the wireless terminal device is lit when the external power supply fails. A lighting operation setting means that is set in accordance with an external command and a second illumination that permits the operation of the lighting control means when the lighting operation setting means is set to turn on the lighting means when a power failure occurs in the external power supply. You may make it provide a permission means.

This is convenient because the user of the wireless terminal device can set for each wireless terminal device whether or not to turn on the illumination means during a power failure.
And the radio | wireless terminal apparatus in any one of Claims 1-8 WHEREIN: When the illumination control means is lighting the illumination means as described in Claim 9, the external power supply returned from the power failure The lighting control unit may turn off the lighting unit when it is determined by the return determination unit that the external power source has recovered from the power failure.

  In this way, if it is determined that the external power supply has recovered from the power failure, the lighting means is turned off, and the lighting is continued only when the power failure state continues, so that waste of power can be avoided.

  Then, whether the return determination means of the wireless terminal device according to claim 9 configured as described above detects that power supply from the charger is detected by the power supply detection means as described in claim 10. Alternatively, it may be determined that the external power supply has recovered from a power failure when a transmission signal from the parent device is received by the communication unit.

  In this case, when there is power supply from the charger, or when a signal transmitted from the parent device is received, it is determined that the power has been restored from the power failure, so the wireless terminal device is connected to the charger. Can determine that the power failure has been restored by supplying power, and even if the wireless terminal device is not connected to the charger, it can determine that the power failure has been restored by receiving a transmission signal from the master unit Therefore, it can be determined more reliably that the power failure has been restored.

  On the other hand, when the illumination control means of the wireless terminal device according to any one of claims 1 to 10 is lighting the illumination means as in claim 11, the amount of power stored in the battery. It is possible to determine whether or not the lighting means can be continuously turned on, and if the lighting means cannot be continuously turned on as a result, the lighting means may be turned off.

  If it does in this way, when the electric energy stored in the battery decreases, the illumination means can be turned off, and it is possible to leave the power that can be communicated immediately after the power failure is restored.

  In addition, the illumination control means of the wireless terminal device according to any one of claims 1 to 11 receives an extinguishing command from the outside when the illumination means is turned on as described in claim 12. Then, the illumination means may be turned off.

This is convenient because the user of the wireless terminal device can select whether to keep the lighting means on or off by an external operation.
And the illumination control means of the radio | wireless terminal apparatus in any one of Claims 1-12 time-measures the elapsed time after lighting an illumination means as described in Claim 13, The elapsed time When the lighting duration reaches a preset lighting duration, the illumination means may be turned off.

In this way, the power is automatically turned off after a preset time has elapsed, so that waste of power can be avoided.
In addition, the wireless terminal device according to any one of claims 1 to 13 includes a display panel for displaying an operation state as described in claim 14, and the illumination unit has a back of the display panel. It may be a light.

Since a backlight of a display panel provided in a handset of a general parent-child phone is turned on as an illuminating means, there is no need to add new hardware, which is convenient.
On the other hand, the invention described in claim 15 is a cordless telephone system including the wireless terminal according to any one of claims 1 to 14, which is connected to a telephone line and directly supplied with power from an external power source. And a charger for receiving a direct power supply from an external power source and supplying a charging power source. According to this system, it is possible to construct a cordless telephone system using the wireless terminal device according to any one of claims 1 to 14.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing configurations of a base unit 10, a slave unit 50, and a charging stand 80 that constitute the cordless telephone system 1. FIG. 2A is a perspective view showing a rear surface of the slave unit 50, and FIG. FIG. 3 is a block diagram showing the electrical configuration of the cordless telephone system 1 of the present embodiment.

  As shown in FIG. 1, the cordless telephone system 1 is connected to a telephone network 100 (see FIG. 3) and is operated in the same manner as a base unit 10 that operates by receiving direct power supply from a commercial power source 90 (see FIG. 3). A charging base 80 that receives power supply directly from the commercial power supply 90 and supplies charging power, and a battery 71 that is charged by receiving power supply from the charging base 80 when placed on the charging base 80. And a handset 50 that operates with electric power charged in the battery 71.

  Of these, the base unit 10 has a handset (H / S) 12 that is a transmitter / receiver used in a state of being detached from the base unit 10 main body attached to the side of the base unit main body case 11. Furthermore, on the upper surface of the main unit main body case 11, a display panel 13 for displaying information related to various functions and various operation buttons used for performing various operations such as inputting a telephone number of the other party. 14 is provided.

  The handset 50 has a display panel 53 for displaying information related to various functions on the surface of the handset main body case 51 in the shape of a handset, and various operations such as inputting the telephone number of the other party. Are provided with an operation button 54 for charging and a charging terminal 55 for connecting a battery 71 for operating the handset 50 to the charging stand 80.

  The display panel 53 illuminates the display screen from the back, and is a liquid crystal provided with a backlight 53a that is used as an emergency light when the commercial power supply 90 fails (hereinafter, the power failure indicates a power failure of the commercial power supply 90). A display (LCD).

  Further, as shown in FIG. 2 (b), the charging base 80 is provided in the charging base body 81 in which the mounting recess 81a on which the slave unit 50 is detachably mounted and the mounting recess 81a. When the slave unit 50 is placed in the placement recess 81a, it is composed of a charging terminal 82 that contacts the charging terminal 55.

Next, the electrical configuration of the cordless telephone system 1 will be described.
As shown in FIG. 3, the base unit 10 is a user interface unit (hereinafter referred to as a user I / F) including a control unit 21, a handset 12, a display panel 13, and operation buttons 14 that control the operation of the base unit 10 as a whole. 15. A speaker 23 for outputting audio signals, a reproducing unit 25 for reproducing audio based on various audio signals stored in advance, and a radio communication unit for transmitting and receiving various signals including audio signals to and from the slave unit 50 by radio communication 27, an NCU (network control unit) 29 for inputting / outputting a voice signal transmitted via the telephone network 100, a path switching unit 31 for switching a voice signal transmission path in the base unit 10, and the like.

Among these, the control unit 21 includes a RAM 21a for storing various data and an EEPROM 21b capable of holding the stored data even when power is not supplied.
The playback unit 25 stores a sound signal such as a ringing tone used when receiving an incoming call, and receives a command from the control unit 21 to play back the stored sound signal. The reproduced audio signal is output from the speaker 23.

And the radio | wireless communication part 27 transmits / receives the various signals containing an audio | voice signal between the subunit | mobile_units 50 by radio | wireless communication.
In addition, when an operation for starting a call is performed, the path switching unit 31 switches a transmission path used for input / output of an audio signal to / from the base unit 10 to either the handset 12 or the wireless communication unit 27. . Specifically, when the handset 12 is removed from the main unit 10 main body, the transmission path is switched to the handset 12, and when the connection request signal to the telephone line network 100 transmitted from the sub unit 50 is received. The transmission path is switched to the wireless communication unit 27.

When a command such as a dial signal of the other party is input from the outside via the user I / F 15, the NCU 29 connects to the telephone line network 100 and inputs / outputs various signals.
In the base unit 10 configured as described above, when the power is turned on, the control unit 21 executes a process of transmitting a signal to the slave unit 50 in order to confirm the presence of the slave unit 50.

  Next, the slave unit 50 includes a control unit 61 that controls the operation of the entire slave unit 50, a transmitter / receiver unit 63 including a speaker, a microphone, and a drive circuit that drives them, a display panel 53 including a backlight 53a, and operation buttons. 54, a reproduction unit 65 that reproduces audio based on various audio signals stored in advance, a speaker 67 that outputs audio reproduced by the reproduction unit 65, and a wireless communication unit of the parent device 10 27), a wireless communication unit 69 that transmits and receives various signals including audio signals by wireless communication, a battery 71 that operates the slave unit 50 with charged power, and the remaining power stored in the battery 71 The power remaining amount monitoring unit 73 for detecting the amount, the charging terminal 55 for electrical connection with the charging terminal 82 of the charging base 80, and the charging base 80 via the charging terminal 55 are provided. Includes a charging circuit 75 for charging the battery 71 by the charging power supply is a voltage monitoring unit 77 for detecting a voltage applied to the charging terminal 55 via a charging circuit 75, a.

The control unit 61 includes a RAM 61a that stores various data and an EEPROM 61b that can hold the stored data even when power is not supplied.
In the RAM 61a, an energization flag F1 that is set when the voltage monitoring unit 77 detects a charging voltage that is equal to or higher than a preset value at the charging terminal 55 of the slave unit 50, and the back of the slave unit 50 are displayed. An emergency light flag F2 indicating that the light 53a is turned on as an emergency light, a power failure flag F3 indicating a power failure state, a return flag F4 indicating a return from the power failure state, and the backlight 53a can be turned on as an emergency light. A lighting flag F5 indicating that the lighting is continued with the backlight 53a as an emergency light, and a communication indicating that the handset 50 cannot communicate with the base unit 10. An impossible flag F7 is stored. In the following description, setting a flag indicates that the value of the flag is 1, and clearing the flag indicates that the value of the flag is 0.

  Further, the RAM 61a is provided with a storage area for storing a count value that is automatically incremented every predetermined time (for example, every 10 ms). The count value is a value that is incremented from 0 again at that time when the value is set (reset) to 0 at a certain time by the processing performed by the control unit 61. In this embodiment, the end determination is performed. Used as a timer T1 and an end determination timer T2.

  The EEPROM 61b stores a control program, an identification number for distinguishing it from other slave units 50 that perform wireless communication with the same master unit 10, the lighting duration of the backlight 53a, and the display panel 53. Message display time, voltage determination value for detecting that a charging voltage is applied to the charging terminal 55, lighting-enabled power value for determining that the backlight 53 a can be turned on, etc. Is stored, and a storage area for storing information set by the user via the user I / F 57 is provided.

The playback unit 65 stores a sound signal such as a ringing tone used when receiving an incoming call, a holding sound used when holding a voice call, and the like.
The control unit 61 of the slave unit 50 configured as described above repeatedly executes the slave unit operation process shown in FIG. 4 when the slave unit 50 is turned on. In this slave unit operation process, the normal call process is performed. Normal operation processing for determining whether or not communication with the base unit 10 is possible in the meantime, power failure determination processing for determining whether or not the commercial power supply 90 is out of power, and the commercial power supply 90 has returned from the power failure state Return determination processing for determining whether or not, lighting start determination processing for determining whether or not the backlight 53a can be turned on as an emergency light, and lighting can be continued using the backlight 53a as an emergency light. An emergency light continuation determination process or the like for determining whether or not is performed.

  The charging stand 80 is directly supplied with power from the commercial power supply 90. When the handset 50 is placed on the charging stand main body 81 and the charging terminal 82 contacts the charging terminal 55 of the handset 50, the battery of the handset 50 is charged. 71 is supplied with a charging voltage.

  In the cordless telephone system 1 configured as described above, the base unit 10 can make an external line call with an external partner communication terminal via the telephone line network 100 while being connected to the commercial power supply 90. At the same time, when the power is turned on, a signal is transmitted to the slave unit 50 in order to confirm the state and number of the slave units 50, and an extension call can be made with the detected slave unit 50.

On the other hand, handset 50 can make an outside line call with external counterpart communication terminal via base unit 10 and can also make an extension call with base unit 10.
In addition, when the user performs an operation for displaying a menu screen for selecting each function of the child device 50 on the display panel 53 from the operation button 54, the control unit 61 causes the control unit 61 to operate at the time of a power failure. A handset menu screen on which a character string such as “backlight operation setting” for setting whether or not to turn on the backlight 53 a as an emergency light is displayed on the display panel 53.

  When the user performs an operation for selecting, for example, “backlight operation setting” from the operation button 54 in a state where the slave unit menu screen is displayed, the control unit 61 selects ON or OFF. The display panel 53 displays a backlight operation registration screen for this purpose. Thereafter, when ON or OFF is selected via the operation button 54, the control unit 61 registers this setting in a storage area provided in the EEPROM 61b.

  Below, the procedure of the slave unit operation process executed by the control unit 61 of the slave unit 50 will be described with reference to FIG. FIG. 4 is a flowchart showing the slave unit operation process. In addition, this subunit | mobile_unit control process is a process which is started when the control part 61 starts with the electric power stored in the battery 71, and is repeatedly performed until there is no electric power.

  When the control unit 61 is activated, first, in S110, the control unit 61 clears the energization flag F1 and the emergency light flag F2 in order to erase the history when the previous process was terminated, and proceeds to S120. In S120, it is determined whether or not the emergency light flag F2 is set. If the emergency light flag F2 is not set (S120: NO), it is determined in S130 whether the energization flag F1 is set.

  And when energization flag F1 is set (S130: YES), it shifts to S160. On the other hand, when the energization flag F1 is not set (S130: NO), it is determined whether or not the charging voltage detected by the voltage monitoring unit 77 in S140 is equal to or higher than the voltage determination value stored in the EEPROM 61b. to decide.

  Here, when the detected charging voltage is not equal to or higher than the voltage determination value (S140: NO), the process proceeds to S330, and normal operation processing (described later, see FIG. 5) is performed. (S140: YES), the energization flag F1 is set in S150, and in the subsequent S160, a power failure determination process (see FIG. 6 to be described later) for determining whether or not the commercial power supply 90 has failed. .

  That is, until the charging voltage reaches the voltage determination value after the control unit 61 is activated, only the normal operation process is repeated, and when the voltage determination value is reached, the power failure determination process is started. For example, when the handset 50 is purchased, as soon as the battery 71 is set in the handset 50, it is determined that there is a power outage by the power outage determination process described later, and the backlight 53a is prevented from being turned on as an emergency light. For this reason, the energization flag F1 is set when the battery 71 of the slave unit 50 is supplied with power from the charging stand 80 (that is, when the slave unit 50 and the charging stand 80 are installed and in use). Therefore, the process proceeds to the power failure determination process. Then, since the energization flag F1 is set, a power failure determination process is performed, and the backlight 53a is turned on as an emergency light according to the determination result.

If it is determined in the power failure determination process that a power failure has occurred, a power failure flag F3 indicating a power failure state is set, and if it is determined that a power failure has not occurred, the power failure flag F3 is cleared.
When the processing of S160 ends, it is determined in subsequent S170 whether or not the power failure flag F3 is set. Here, when the power failure flag F3 is not set, that is, when it is determined that a power failure has not occurred (S170: NO), the process proceeds to S330 and normal operation processing (described later) is performed. On the other hand, when the power failure flag F3 is set, that is, when it is determined that a power failure has occurred (S170: YES), the energization flag F1 is cleared in S180, and the backlight 53a is turned on in S190. As shown in FIG. 7, an emergency light start determination process (to be described later, see FIG. 7) is performed to determine whether or not lighting can be started. If it is determined in this emergency light start determination process that the backlight 53a can be turned on as an emergency light, the lighting flag F5 indicating that the lighting can be started is set, and it is determined that the lighting cannot be started. Then, the lighting flag F5 is cleared.

  When the process of S190 is completed, it is determined in subsequent S200 whether or not the lighting flag F5 is set. Here, when the lighting flag F5 is not set, that is, when it is determined that lighting cannot be started (S200: NO), the process proceeds to S330, and normal operation processing (described later) is performed. On the other hand, when the lighting flag F5 is set, that is, when it is determined that lighting can be started (S200: YES), the emergency light flag F2 is set in S210, and the end determination timer T1 is reset in S220. In S230, the message displayed on the display panel 53 in the normal operation process (process) is cleared. In subsequent S240, the backlight 53a is turned on. When S240 ends, the process proceeds to S120.

  On the other hand, when the emergency light flag F2 is set in S120 (S120: YES), the process proceeds to S250, and a return determination process (refer to FIG. 8 described later) for determining return from the power failure state. Do. If it is determined in this return determination process that the power supply has recovered from the power failure state, a recovery flag F4 indicating that the power supply has recovered from the power failure state is set. If it is determined that the power supply has not recovered, the recovery flag F4 is cleared. .

  When the processing of S250 is completed, it is determined in subsequent S260 whether or not the return flag F4 is set. Here, when the return flag F4 is not set, that is, when it is determined that the power is still out (F260: NO), the process proceeds to S270 to determine whether the emergency light can be continuously lit. A lamp continuation determination process (see FIG. 9 described later) is performed. Then, in this emergency light continuation determination process, if it is determined that the backlight 53a can be continuously lit as an emergency light, the continuation flag F6 indicating that the lighting can be continued is set, and it is determined that the lighting cannot be continued. Then, the continuation flag F6 is cleared.

When the processing of S270 ends, it is determined in subsequent S280 whether or not the continuation flag F6 is set. Here, when the continuation flag F6 is set, that is, when it is determined that the lighting can be continued (F280: YES), the process proceeds to S290, and the elapsed time after the backlight 53a is turned on (S220). The value of the end determination timer T1 (hereinafter referred to as the end determination timer value T1) indicating the time from the process of (1) is the lighting duration time (for example, 10 minutes) of the backlight 53a stored in the EEPROM 61b as the end timer value. Determine whether it has exceeded. If the end determination timer value T1 does not exceed the predetermined end timer value (S290: NO), the process proceeds to S120, and the process is repeated.
On the other hand, when the return flag F4 is set at S260 (S260: YES), when the continuation flag F6 is not set at S280 (S280: YES), the end determination timer value T1 is set to a predetermined end at S290. When the timer value has been exceeded (S290: YES), that is, when it has been recovered from the power failure state, it has been determined that the continuation of lighting has been canceled or impossible, or the backlight 53a is lit for a predetermined time, the process proceeds to S300. Then, a message notifying that the lighting of the backlight 53a is finished is displayed on the display panel 53.

  Then, in the subsequent S310, the backlight 53a is turned off, in the subsequent S320, the emergency light flag F2 is cleared, the process proceeds to S330, and normal operation processing (described later) is performed. In the normal operation process, it is determined whether or not the child device 50 can communicate with the parent device 10, and if it is determined that communication is not possible, the communication impossible flag F7 indicating that communication is impossible is set. If it is determined that the communication is impossible, the communication disable flag F7 is cleared.

When the normal operation process in S330 ends, the process proceeds to S120.
Here, the processes of S110 to S230, S320, and S330 are performed when the backlight 53a is turned off, and the processes of S240 to S300 are performed when the backlight 53a is turned on as an emergency light. .
Next, the procedure of normal operation processing performed in S330 will be described with reference to FIG. FIG. 5 is a flowchart showing normal operation processing of the child device 50.

When the normal operation process is executed, the control unit 61 first executes a standby process in a cordless system telephone handset in S410.
When the standby process ends, the process proceeds to S420, the communication disabled flag F7 is cleared, and the process proceeds to S430. Then, in S430, it is determined whether or not the charging voltage detected by voltage monitoring unit 77 is equal to or higher than the voltage determination value, that is, whether or not voltage supply is received from charging stand 80. Here, when the detected charging voltage is not equal to or higher than the voltage determination value, that is, when there is no voltage supply from the charging stand 80 due to the handset 50 being lifted from the charging stand 80 (S430: NO), S440. Then, in order to connect the handset 50 to the telephone line network 100, a connection request to the telephone line network 100 is transmitted to the base unit 10 via the wireless communication unit 69, and in S450, the end determination timer T2 is reset. Then, the process proceeds to S460.

In S460, it is determined whether a response from base unit 10 is received via wireless communication unit 69. If a response from base unit 10 cannot be received (S460: NO), in S470. The display panel 53 displays a message that prompts the user to confirm the state of the parent device 10. In subsequent S480, the value of end determination timer T2 (hereinafter referred to as end determination timer value T2) indicating the elapsed time since the connection request was transmitted to base unit 10 is stored in EEPROM 61b as the end timer value. It is determined whether or not the message display time (for example, 3 seconds) on the display panel 53 is exceeded. Here, in the process of S450, when the end determination timer value T2 does not exceed the predetermined end timer value (S480: NO), the process proceeds to S460, and the processes of S460 to S480 are repeated.
On the other hand, if the end determination timer value T2 exceeds the predetermined end timer value in S480 (S480: YES), the communication disable flag F7 is set in S490 and the process ends.
On the other hand, in S430, when the detected charging voltage is equal to or higher than the voltage determination value (S430: YES), the process ends as it is. If a response from the parent device 10 is received in S460 (S460: YES), the process proceeds to S500 to perform a call process, and the process ends.

Next, the procedure of the power failure determination process performed in S160 will be described with reference to FIG. FIG. 6 is a flowchart showing a power failure determination process.
When the power failure determination process is executed, the control unit 61 first determines in S610 whether or not the charging voltage detected by the voltage monitoring unit 77 is equal to or lower than the voltage determination value. If the detected charging voltage is equal to or lower than the voltage determination value (S610: YES), the process proceeds to S620, and it is determined whether or not the communication disable flag F7 is set. If the communication disable flag F7 is set, that is, if communication with the base unit 10 is not possible after waiting for a certain time (S620: YES), it is determined that a power failure has occurred, and the process proceeds to S630. The power failure flag F3 is set and the process is terminated.

  On the other hand, if the detected charging voltage is not equal to or lower than the voltage determination value in S610 (S610: NO), or if the communication disable flag F7 is not set in S620 (S620: NO), no power failure has occurred. The process proceeds to S640, the power failure flag F3 is cleared, and the process ends.

Next, the emergency light start determination process performed in S190 will be described with reference to FIG. FIG. 7 is a flowchart showing the emergency light start determination process.
When the emergency light start determination process is executed, the control unit 61 first determines in S710 whether or not the child device 50 is a child device to be turned on. In this embodiment, it is set that the identification number set in advance is the identification number of the target slave unit, and that the user uses the backlight 53a as an emergency light from the operation button 54 in the procedure described above. Judging that

  If it is determined that the slave unit is an emergency light target (S710: YES), the remaining amount value of the power stored in the battery 71 detected by the remaining power monitoring unit 73 in S720 is determined. Then, it is determined whether or not it is greater than or equal to the lighting possible power value stored in the EEPROM 61b. Here, if the detected remaining power value is equal to or greater than the illuminable power value (S720: YES), it is determined that the lighting can be started, and the process proceeds to S730 and the lighting flag F5 is set. End the process.

  On the other hand, if it is determined in S710 that the slave unit is not an emergency light target (S710: NO), if the detected remaining power value is not equal to or higher than the litable power value (S720: NO), the light is turned on. It is determined that the process cannot be started, the process proceeds to S740, the lighting flag F5 is cleared, and the process ends.

Next, the procedure of the return determination process performed in S250 will be described with reference to FIG. FIG. 8 is a flowchart showing the return determination process.
When the return determination process is executed, the control unit 61 first determines in S810 whether or not the charging voltage detected by the voltage monitoring unit 77 is equal to or lower than the voltage determination value. Here, if the detected charging voltage is equal to or lower than the voltage determination value (S810: YES), the process proceeds to S820, and whether or not a transmission signal from the parent device 10 is received via the wireless communication unit 69. Judging. If the transmission signal from the parent device 10 is not received (S820: YES), it is determined that the signal has not been restored, the process proceeds to S830, the return flag F4 is cleared, and the process ends.

  Note that the transmission signal from the parent device 10 in the determination process of S820 is not provided with a special configuration if a signal transmitted from the parent device 10 to confirm the state and number of the child devices 50 when the power is restored is used. This processing can be performed.

  On the other hand, if the detected charging voltage is not less than or equal to the voltage determination value in S810 (S810: NO), if a transmission signal is received from the base unit 10 in S820 (S820: NO), the power failure is detected. It determines with having returned, and it transfers to S840, sets the return flag F4, and complete | finishes the said process.

Next, the emergency light continuation determination process performed in S270 will be described with reference to FIG. FIG. 9 is a flowchart showing the emergency light continuation determination process.
When the emergency light continuation determination process is executed, the control unit 61 first determines in S910 whether or not any of the operation buttons 54 has been operated by the user. If it is determined that none of the operation buttons 54 is operated (S910: NO), the remaining amount value of the power stored in the battery 71 detected by the remaining power monitoring unit 73 in S920 is calculated. Then, it is determined whether or not it is equal to or higher than the power value that can be turned on. Here, if the detected remaining power value is equal to or greater than the illuminable power value (S920: YES), it is determined that the lighting can be continued, the process proceeds to S930, and the continuation flag F6 is set. The process ends.

  On the other hand, if it is determined in S910 that the operation button 54 has been operated (S910: YES), it is determined that there has been a release instruction from the user, and the detected remaining power value is not greater than or equal to the illuminable power value. In (S920: NO), it is determined that lighting cannot be continued, the process proceeds to S940, the continuation flag F6 is cleared, and the process ends.

  When the cordless phone system 1 configured as described above is mounted on the charging base 80 that receives power directly from the commercial power supply 90 and supplies the charging power, the cordless telephone system 1 receives a voltage from the charging base 80. A battery 71 that is supplied and charged is built in, and operates with the electric power charged in the battery 71. The battery 71 is connected to the telephone line network 100 via the wireless communication unit 69 and communicates with the other communication terminal. Communication is possible, and wireless communication is possible with the parent device 10 that operates by receiving direct power supply from the commercial power supply 90.

  Then, the control unit 61 determines the presence / absence of voltage supply based on the voltage value supplied from the charging stand 80 detected by the voltage monitoring unit 77, and when there is no voltage supply, the control unit 61 via the wireless communication unit 69 When a connection request with the telephone line network 100 is transmitted to 10 and a response cannot be received from the base unit 10, it is determined that communication with the base unit 10 is not possible, and it is determined that a power failure has occurred. Yes.

  For this reason, when the control unit 61 determines that there is no voltage supply from the charging stand 80, the control unit 61 automatically transmits a connection request for connection to the telephone network 100 to the base unit 10. Since base unit 10 does not respond to the connection request, it cannot determine that it has received a response from base unit 10 and determines that a power failure has occurred. Therefore, it is possible to reliably determine the power failure and turn on the backlight 53a without adding hardware for determining the power failure and also when the slave unit 50 is removed from the charging stand 80.

  On the other hand, when there is no power failure, a response from the base unit 10 can be received and automatically connected to the telephone line network 100. Therefore, when the handset 50 is removed from the charging stand 80, it is automatically connected to the telephone line network 100. Possible quick call function.

  Moreover, according to the subunit | mobile_unit 50 of this embodiment, the control part 61 is based on the electric energy stored in the battery 71 detected by the electric power residual amount monitoring part 73, and the predetermined lighting possible electric power value. It is determined whether or not to start lighting the backlight 53a, and the backlight 53a is lit when it is equal to or higher than the illuminable power value. Therefore, when the amount of power stored in the battery 71 is small, the backlight 53a Can be prevented from being lit, and power that can be communicated can be left immediately after the power failure is restored.

  And since the identification number for distinguishing from the other subunit | mobile_unit 50 which carries out radio | wireless communication with the same main | base station 10 is set, and it is the identification number where lighting of the backlight 53a was permitted, since it lights, Consumption can be reduced, and it is possible to secure the handset 50 that can make a call immediately after the power failure is restored.

  Further, according to the slave unit 50 of the present embodiment, whether or not the backlight 53a is turned on in the event of a power failure can be set via the user I / F 15. In addition, it is convenient because it can be set whether or not the backlight 53a is turned on at the time of a power failure.

  Moreover, according to the subunit | mobile_unit 50 of this embodiment, when the backlight 53a is lighted at the time of a power failure, it is judged that there is voltage supply from the charging stand 80, or via the radio | wireless communication part 69. Since it is determined whether or not the power failure has been restored depending on whether a signal from the parent device 10 has been received, it can be more reliably determined that the power failure has been restored. Then, since the backlight 53a is turned off when the power is restored, it is possible to continue the lighting only when the power failure continues and avoid waste of power.

  Further, when the backlight 53a is turned on, the backlight 53a is turned off if the amount of power stored in the battery 71 is less than or equal to the turnable power value. I can keep it. Further, since any one of the operation buttons 54 is operated from the outside, the backlight 53a is turned off, so that the user of the slave unit 50 can select whether the backlight 53a is continuously turned on or off. Is good.

  And according to the subunit | mobile_unit 50 of this embodiment, the elapsed time after lighting the backlight 53a is measured by the completion | finish determination timer T1 provided in RAM61a, and when the preset lighting continuation time is reached, Since the lights are automatically turned off, waste of power can be avoided.

And since the backlight 53a of the display panel 53 is turned on, the subunit | mobile_unit 50 can be used as an emergency light at the time of a power failure, without newly adding hardware.
In the embodiment described above, the slave unit 50 corresponds to the wireless terminal device in the present invention, the wireless communication unit 69 corresponds to the communication means in the present invention, and the processing of the voltage monitoring unit 77 and S140, S430, S610, and S810 is performed. This corresponds to the power supply detection means in the present invention.

  And the process of S170 and a power failure determination process are corresponded to the power failure determination means in this invention, the battery residual amount monitoring part 73, the process of S190-S240, S270-S290, S310, S320, S720-S740, and the emergency light continuation determination process Corresponds to the illumination control means in the present invention, S420 to S490 are connection request transmission means in the present invention, S710 is the first illumination permission means and second illumination permission means in the present invention, S260 and the return determination process are This corresponds to the return determination means in the invention.

The operation setting procedure of the backlight 53a described above corresponds to the lighting operation setting means of the present invention.
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said actual form, As long as it belongs to the technical scope of this invention, a various form can be taken.

    For example, as Modification 1 of the above embodiment, as shown in FIG. 10A, a recess 58 is formed at the center of the mounting surface of the slave unit 50 on the charging stand 80, and A switch 59 for detecting that the machine 50 is placed on the charging stand 80 is provided. On the other hand, as shown in FIG. 10B, the charging stand 80 has a child at the center in the placing recess 81a. A protrusion 83 that contacts the switch 59 may be provided when the machine 50 is placed in the placement recess 81a. In the first modification, the switch 59 corresponds to the placement detection means in the present invention.

  In this case, as shown in FIG. 11, the slave unit 50 includes a switch 59 connected to the control unit 61. When the slave unit 50 is placed on the charging stand 80, the switch 59 causes the slave unit 50 to be connected. Whether or not 50 is placed on the charging stand 80 is detected. 10 is a perspective view showing the external appearance of the handset 50 and the charging stand 80 of the first modification, and FIG. 11 is a block diagram showing the electrical configuration of the cordless telephone system 1 including the handset 50 of the modification. It is.

And in such a subunit | mobile_unit 50, the power failure determination process performed in S160 of the subunit | mobile_unit operation processing shown in FIG. 4 should just be performed as shown in FIG.
That is, when the power failure determination process is executed, the control unit 61 first determines in S1010 whether or not the charging voltage detected by the voltage monitoring unit 77 is equal to or lower than the voltage determination value. If the detected charging voltage is equal to or lower than the voltage determination value (S1010: YES), the process proceeds to S1020, and it is determined whether or not the communication disable flag F7 is set. Then, when the communication impossibility flag F7 is set (S1020: YES), it is determined whether or not the handset 50 is placed on the charging base 80 based on the detection result by the switch 59. If it is determined that it is placed (S1030: YES), it is determined that a power failure has occurred, the process proceeds to S1040, the power failure flag F3 is set, and the process ends.

  On the other hand, when the detected charging voltage is not less than or equal to the voltage determination value at S1010 (S1010: NO), when the communication disable flag F7 is not set at S1020 (S1020: NO), the handset 50 is charged. If it is not mounted on 80 (S1030: NO), it is determined that a power failure has not occurred, the process proceeds to S1050, the power failure flag F3 is cleared, and the process ends.

  And if it does in this way, after judging that there is no voltage supply from the charging stand 80, and judging that communication with the main | base station 10 cannot be performed, it is judged whether it is mounted in the charging stand 80, and mounting is carried out. Therefore, the power failure of the commercial power supply 90 can be determined more reliably when the slave unit 50 is disconnected from the charging base 80 and cannot communicate with the master unit 10. Therefore, it is possible to prevent the backlight 53a from being unnecessarily lit.

Furthermore, in the subunit | mobile_unit 50 of such a modification 1, you may perform the power failure determination process performed in S160 of the subunit | mobile_unit operation processing shown in FIG. 4 as shown in FIG.
That is, when the power failure determination process is executed, the control unit 61 first determines in S1110 whether or not the charging voltage detected by the voltage monitoring unit 77 is equal to or lower than the voltage determination value. Here, when the detected charging voltage is equal to or lower than the voltage determination value (S1110: YES), the process proceeds to S1120, and it is determined whether or not the child device 50 is placed on the charging stand 80. If it is determined that the device is not placed (S1120: NO), the process proceeds to S1130, and it is determined whether or not the communication disable flag F7 is set. If the communication disable flag F7 is set (S1130: YES), it is determined that a power failure has occurred, the process proceeds to S1140, the power failure flag F3 is set, and the process is terminated.

  If it is determined in S1120 that the battery is placed on the charging stand 80 (S1120: YES), it is determined that a power failure has occurred, and the process proceeds to S1140 where the power failure flag F3 is set. Exit.

  On the other hand, if the detected charging voltage is not less than or equal to the voltage determination value in S1110 (S1110: NO), or if the communication disable flag F7 is not set in S1130 (S1130: NO), no power failure has occurred. The process proceeds to S1150, the power failure flag F3 is cleared, and the process ends.

  In this way, when it is determined that there is no voltage supply from the charging stand 80 and it is determined that it is placed on the charging stand 80, it is immediately determined that a power failure has occurred, and when it is not placed on the charging stand 80 Only the communication with the parent device 10 is performed, and it is determined that a power failure has occurred when communication with the parent device 10 is not possible, so the processing for determining a power failure can be reduced.

  Further, for example, as a second modification of the above embodiment, the communication impossibility flag F7 is not used, the processes of S420 to S490 of the normal operation process are deleted, and only the standby process and the call process are repeated in the normal operation process. In addition, the process of clearing the message display displayed on the display panel 53 in S230 of the slave unit operation process is deleted, and is wireless communication possible with the base unit 10 in the process of S620 of the power failure determination process? It may be configured to determine whether or not.

  In this way, a power failure determination process can be realized even for the handset 50 that does not have a function for automatically connecting to the telephone network 100 when the handset 50 is removed from the charging stand 80, that is, the quick call function. it can.

  In the above embodiment, the cordless telephone system 1 is exemplified as the cordless telephone system of the present invention, and the slave unit 50 used in the cordless telephone system 1 is exemplified as the application of the configuration of the wireless terminal device of the present invention. However, if the wireless terminal device to which the configuration of the present invention is applied has a function of performing wireless communication between the parent device and the child device, a device other than the cordless telephone system 1, for example, a facsimile device having the parent device and the child device. Or a multifunction machine. The parent device does not need to be connected to the telephone network 100, and may be an interphone.

  On the other hand, the backlight 53a is used as an emergency light, but an LED may be provided separately. In addition, the backlight 53a is turned on also during a call process or the like, but by increasing the amount of light of the backlight 53a during a power failure than during these processes, the backlight 53a as an emergency light and the normal backlight 53a May be distinguished.

  In the above embodiment, when the backlight 53a is turned on, the backlight 53a is turned off when any of the operation buttons 54 is operated from the outside. When the off button is operated, the backlight 53a may be turned off. In this way, it is possible to prevent the user from accidentally turning off the backlight 53a used as an emergency light.

1 is a perspective view showing an appearance of a cordless telephone system 1. FIG. FIG. 3 is a perspective view showing the external appearance of a slave unit 50 and a charging stand 80. 1 is a block diagram illustrating an electrical configuration of a cordless telephone system 1. FIG. It is a flowchart which shows the subunit | mobile_unit operation | movement process of the subunit | mobile_unit 50. 5 is a flowchart showing details of normal operation processing of FIG. 4. It is a flowchart showing the detail of the power failure determination process of FIG. It is a flowchart which shows the detail of the emergency light start determination process of FIG. It is a flowchart which shows the detail of the return determination process of FIG. It is a flowchart which shows the detail of the emergency light continuation determination process of FIG. It is a perspective view which shows the external appearance of the subunit | mobile_unit 50 and the charging stand 80 of the modification 1. FIG. It is a block diagram showing the electric constitution of the cordless telephone system 1 provided with the subunit | mobile_unit 50 of the modification 1. It is a flowchart which shows the power failure determination process by the subunit | mobile_unit 50 of the modification 1. It is a flowchart which shows the other example of the power failure determination process by the subunit | mobile_unit 50 of the modification 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cordless telephone system, 10 ... Master phone, 11 ... Master phone main body case, 12 ... Handset, 13 ... Display panel, 14 ... Operation button, 15 ... User I / F, 21 ... Control part, 23 ... Speaker, 25 ... Reproduction unit, 27 ... wireless communication unit, 31 ... path switching unit, 50 ... slave unit, 51 ... slave unit body case, 53 ... display panel, 53a ... backlight, 54 ... operation button, 55 ... charging terminal, 57 ... User I / F, 58 ... concave portion, 59 ... switch, 61 ... control unit, 63 ... transmission / reception unit, 65 ... reproduction unit, 67 ... speaker, 69 ... wireless communication unit, 71 ... battery, 73 ... remaining power monitoring unit , 75 ... charging circuit, 77 ... voltage monitoring unit, 80 ... charging stand, 81 ... charging stand body, 81a ... mounting recess, 82 ... charging terminal, 83 ... projection, 90 ... commercial power supply, 100 ... telephone network

Claims (15)

When connected to a charger that receives power directly from an external power supply and supplies power for charging, a battery that receives power from this charger and is charged is built-in. An operating wireless terminal device,
A communication means for performing wireless communication with a master unit that operates by receiving power supply directly from the external power source;
Power supply detection means for detecting the presence or absence of power supply from the charger;
When it is detected by the power supply detection means that there is no power supply from the charger, it is determined whether or not communication is possible with the parent device via the communication means, and as a result communication is not possible. A power failure determination means for determining that the external power source has a power failure,
When it is determined by the power failure determination means that the external power source has a power failure, illumination control means for lighting the illumination means,
A wireless terminal device comprising: The master unit communicates with a partner communication terminal via a telephone line,
The wireless terminal device, when the power supply detection means detects that there is no power supply from the charger, a connection request transmission means for transmitting a connection request with a telephone line to the master unit via the communication means With
The power failure determination means determines that communication with the parent device is not possible when the connection request transmission means cannot receive a response from the parent device after transmitting the connection request, and the external power supply The wireless terminal device according to claim 1, wherein it is determined that the wireless terminal device is operating. The charger is a charging stand on which the wireless terminal device can be placed,
The wireless terminal device includes placement detection means for detecting whether or not the wireless terminal device is placed on the charging stand,
The power failure determining means detects that there is no power supply from the charging stand by the power supply detecting means, detects that the wireless terminal device is placed on the charging stand by the placement detecting means, 3. The wireless terminal device according to claim 1, wherein it is determined that the external power source is out of power based on a determination that communication with a device is not possible.   When the power failure detection means detects that the power supply detection means does not supply power from the charging stand, the power failure determination means determines whether communication with the parent device is possible via the communication means, As a result, when communication is not possible, it is determined whether the wireless terminal device is placed on the charging stand by the placement detection means, and the placement is detected. The wireless terminal device according to claim 3, wherein the external power source is determined to be out of power when the external power source is out of power.   The power failure determination means detects that the wireless terminal device is placed on the charging stand by the placement detection means when the power supply detection means detects that there is no power supply from the charging stand. If it is detected whether or not it is placed, it is possible to determine whether or not communication is possible with the parent device via the communication means, If it is determined that the external power supply is out of power and it is not detected that it is mounted, it is determined whether communication is possible with the parent device via the communication means, The wireless terminal device according to claim 3, wherein when the communication is not possible, it is determined that the external power source has a power failure.   The lighting control means determines whether or not the lighting means can be turned on from the amount of electric power stored in the battery when the power failure determination means determines that the external power supply has failed. The wireless terminal device according to any one of claims 1 to 5, wherein when the lighting is possible, the lighting unit is turned on. The wireless terminal device is set with an identification number for distinguishing it from other wireless terminal devices that perform wireless communication with the same base unit,
When it is determined by the power failure determination means that the external power supply has a power failure, it is determined whether or not the identification number is an identification number for which lighting of the illumination means is permitted. 7. The wireless terminal according to claim 1, further comprising a first illumination permission unit that permits the operation of the illumination control unit when the lighting is an identification number permitted to be lit. apparatus. A lighting operation setting means for setting whether or not to turn on the illumination means of the wireless terminal device according to a command from the outside when the external power supply fails.
The lighting operation setting means includes a second illumination permission means for permitting the operation of the illumination control means when the lighting means is set to be lit when a power failure occurs in the external power supply. The radio | wireless terminal apparatus in any one of Claims 1-7. When the lighting control means is turning on the lighting means, comprising a return determination means for determining whether or not the external power source has recovered from a power failure,
The radio according to any one of claims 1 to 8, wherein the illumination control unit turns off the illumination unit when the return determination unit determines that the external power supply has recovered from a power failure. Terminal device.   The return determination means is configured to detect the external power supply when the power supply detection means detects that there is power supply from the charger or when the communication means receives a transmission signal from the master unit. The wireless terminal device according to claim 9, wherein the wireless terminal device is determined to have recovered from a power failure.   The lighting control means determines whether or not the lighting means can be continuously turned on from the amount of power stored in the battery when the lighting means is turned on, and as a result, the lighting control means cannot be turned on continuously. The wireless terminal device according to claim 1, wherein the illumination unit is turned off in a case.   12. The lighting control unit according to any one of claims 1 to 11, wherein the lighting control unit turns off the lighting unit when a turn-off command is input from the outside while the lighting unit is turned on. Wireless terminal device.   The lighting control means measures an elapsed time since the lighting means is turned on, and turns off the lighting means when the elapsed time reaches a preset lighting duration. The wireless terminal device according to claim 12. The wireless terminal device includes a display panel for displaying an operation state,
The wireless terminal device according to claim 1, wherein the illumination unit is a backlight of the display panel. A master unit that is connected to a telephone line and operates by receiving power directly from an external power source,
A charger for receiving a power supply directly from the external power source and supplying a power source for charging;
A wireless terminal device that incorporates a battery that is charged by being supplied with power from the charger when connected to the charger, and that operates with the power charged in the battery;
A cordless telephone system in which the wireless terminal device is connected to the telephone line by performing wireless communication with the base unit,
A cordless telephone system comprising the wireless terminal device according to any one of claims 1 to 14 as the wireless terminal device.

Images