JP2006042177A - Power-saving apparatus, portable terminal and power-saving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform efficient power saving of a portable terminal, even when the portable terminal remains outside a radio area over a long time. <P>SOLUTION: A CPU 51 automatically turns off the power supply of a cellular phone 10, when it is judged that the cellular phone 10 is present outside the radio area. In addition, a power start signal generating circuit 57 starts count of elapsed time after turning the power source off. The CPU 51 determines power power-off time so that it become longer as period during which the cellular phone 10 exists outside the radio area becomes longer, based on a power-off count value. In addition, the power start signal generation part 57 decides whether it has elapsed over the power-off time, after the power supply is turned off. When it is decided that it elapses over the power-off time or more, the power start signal generating circuit 57 outputs a power start signal and the CPU 51 turns the power supply of the cellular phone 10 on again. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power saving apparatus and a power saving method for realizing power saving of a mobile terminal by controlling a power source. The present invention also relates to a portable terminal equipped with a power saving device.

  In general, a mobile terminal such as a mobile phone or a PHS performs a base station identification process called cell search to recognize a wireless area where the mobile terminal is located. In this case, if the mobile terminal is outside the radio area, the mobile base station cannot be found and repeatedly performs cell search, and consumes more power than when it is within the radio area. Therefore, efficient power saving of the mobile terminal cannot be achieved.

  Patent Document 1 describes a mobile phone that can reduce power consumption when outside the wireless area. The mobile phone described in Patent Document 1 turns off the power of the mobile phone by the user's instruction input or when the out-of-service display continues for a predetermined time. Then, the cellular phone automatically turns on (automatically activates) the cellular phone again after the set predetermined time has elapsed. Further, Patent Document 2 describes a battery save control device for a portable terminal that turns off the power for a predetermined period except when the control channel search operation is performed during out-of-service standby.

JP 2002-208887 A (paragraphs 0013-0015, FIG. 1-2) JP 7-95144 A (paragraphs 0008-0009, FIG. 1-2)

  According to the mobile phone described in Patent Document 1 and the battery save control device described in Patent Document 2, when the mobile terminal is out of the wireless area, the mobile terminal is turned off for a predetermined time, so that it is portable to some extent. The power consumption of the terminal can be reduced. However, since the power supply is automatically activated after a predetermined time and the cell search is repeated, the cell search is repeated many times if the mobile terminal remains outside the radio area for a long time. . Therefore, when the mobile terminal stays outside the wireless area for a long time, power saving may not be achieved sufficiently.

  Therefore, the present invention provides a power-saving device, a portable terminal, and a power-saving method that can achieve efficient power-saving of a mobile terminal even when the mobile terminal stays outside the radio area for a long time. The purpose is to provide.

  A power saving apparatus according to the present invention is a power saving apparatus that realizes power saving of a mobile terminal by controlling a power source, and determines whether or not the mobile terminal is out of a wireless area. Power supply control means (implemented by the CPU 51 and the power supply circuit operating according to the program) for turning off the power of the mobile terminal or turning on the power of the mobile terminal, and power control means Time determining means (implemented by the CPU 51 operating according to the program) for determining a set time (power-off time) from when the portable terminal is turned off to when the portable terminal is turned on again, and power control means Has passed since the mobile device turned off to determine whether the set time determined by the time determination means has elapsed or not Disconnecting means (implemented by the power activation signal generating circuit 57), and the power control means turns off the power of the mobile terminal when the mobile terminal is determined to be out of the wireless area by the out-of-service determining means, and the mobile terminal When the time elapse determining means determines that the set time has elapsed since the power is turned off, the mobile terminal is turned on again. The out-of-service determining means is turned on every time the power control means turns on the mobile terminal. It is determined whether the portable terminal is outside the wireless area, and the time determining means determines the set time so as to become longer as the time that the portable terminal is outside the wireless area becomes longer.

  Further, the time determination means may determine the set time so as to increase as the number of times the power supply control means turns off the portable terminal increases. According to such a configuration, the set time is set so as to increase as the number of times the power supply is automatically turned off continuously increases, so that the longer the time that the mobile terminal is out of the wireless area, the longer the time is. The set time can be set as follows. Therefore, when the portable terminal stays outside the wireless area for a long time, it is possible to lengthen the time until the portable terminal is automatically turned off and then turned on again.

  Further, when the time elapse determining means determines that the number of times the power supply control means turns off the power of the mobile terminal is equal to or greater than a predetermined upper limit, the power supply control means turns off the power of the mobile terminal, It may be determined whether or not a predetermined upper limit time set in advance as the set time has elapsed. According to such a configuration, when performing power saving control of the mobile terminal, it is possible to prevent the time for which the power of the mobile terminal is turned off from being unlimited.

  In addition, the power saving apparatus includes set time storage means (implemented by the memory 60 that stores the correspondence table) that stores the number of times the power supply control means turns off the mobile terminal and the set time. The time determination means may extract a set time corresponding to the number of times the power supply control means turns off the mobile terminal from the set time storage means.

  The power saving apparatus includes a battery capacity calculation unit (implemented by the CPU 51 operating according to a program) for determining the battery capacity of the mobile terminal, and the time determination unit is based on the battery capacity calculated by the battery capacity calculation unit. The set time may be determined so as to increase as the battery capacity of the mobile terminal decreases. According to such a configuration, even when the battery capacity of the mobile terminal is low, the battery of the mobile terminal can be made to last longer.

  In addition, the power saving apparatus includes time calculation means (implemented by the CPU 51 operating according to a program) for obtaining an elapsed time from when the user operation was last performed, and the time determination means is obtained by the time calculation means. Based on the elapsed time, the set time may be determined so as to become longer as the elapsed time from when the user operation was last performed becomes longer. According to such a configuration, it is possible to more efficiently reduce the power consumption of the mobile terminal when the usage frequency of the user is low.

  The power saving apparatus includes time input setting means (implemented by the CPU 51 and the input unit 55 operating according to a program) for setting a set time in accordance with a user input instruction. It may be determined whether or not a set time set by the time input setting unit has elapsed since the power of the portable terminal is turned off.

  Further, the power saving apparatus turns off the power of the mobile terminal again when the mobile terminal is determined to be out of the radio area by the out-of-service determining means after the power control means turns on the power of the mobile terminal. Power off time setting means (implemented by the CPU 51 operating according to the program) for setting the time until the power supply control means is provided on the condition that the time set by the power off time setting means has elapsed. The power may be turned off again.

  Further, the power-off time setting means may set a time until the power of the portable terminal is turned off again in accordance with a user input instruction.

  A mobile terminal according to the present invention is a mobile terminal (implemented by the mobile phone 10) equipped with a power saving device that realizes power saving by controlling a power source. Out-of-service determining means for determining whether the mobile terminal is out of the radio area, power control means for turning off the power of the mobile terminal or turning on the power of the mobile terminal, and after the power control means turns off the power of the mobile terminal Time determination means for determining a set time until the mobile terminal is turned on again, and whether or not the set time determined by the time determination means has elapsed since the power supply control means turned off the power of the mobile terminal. A time elapse determining means for determining, and when the out-of-service determining means determines that the mobile terminal is out of the wireless area, the power control means turns off the mobile terminal and turns on the mobile terminal. When the time elapse determining means determines that the set time or more has elapsed, the mobile terminal is turned on again. The out-of-service determining means It is determined whether or not the mobile terminal is out of the wireless area, and the time determining means determines the set time so as to become longer as the time during which the mobile terminal is out of the wireless area becomes longer.

  A power saving method according to the present invention is a power saving method for realizing power saving of a mobile terminal by controlling a power source, and the mobile terminal goes out of the wireless area each time the mobile terminal is turned on. The step of determining whether or not the mobile terminal is out of the wireless area, the step of turning off the power of the mobile terminal, and the longer the time the mobile terminal is out of the wireless area, Determining a set time from turning off the mobile terminal to turning on the mobile terminal again; determining whether or not a set time has elapsed since turning off the mobile terminal; A step of turning on the power of the portable terminal again when it is determined that a set time or more has passed since the power of the portable terminal was turned off.

  According to the present invention, the predetermined set time is set so as to increase as the time during which the mobile terminal is out of the wireless area increases. Then, after the portable terminal is automatically turned off, the portable terminal is turned on again on condition that a predetermined set time has elapsed. Therefore, when the mobile device stays outside the wireless area for a long time, the time from turning the mobile device power off automatically to turning it on again can be increased. The number of cell searches can be reduced. Therefore, even when the mobile terminal stays outside the wireless area for a long time, the mobile terminal can efficiently save power.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of a configuration of a power saving system for a portable terminal to which a power saving device according to the present invention is applied. In the present embodiment, a case where the power saving device is mounted on the mobile phone 10 will be described. The power saving device can be mounted not only on the mobile phone 10 but also on other mobile terminals such as PHS.

  In the present embodiment, the power saving apparatus automatically turns off the power of the mobile phone 10 when it is determined that the mobile phone 10 is outside the wireless area, and automatically turns off the power of the mobile phone 10 again after a predetermined time has elapsed. Executes power saving control processing that starts automatically. That is, the power saving device reduces power consumption of the mobile phone 10 by repeatedly turning off the power of the mobile phone 10 for a predetermined time. Further, the power saving device executes the power saving control process while changing the time from when the power is turned off to when it is turned on again according to the length of time that the mobile phone 10 is outside the wireless area.

  As shown in FIG. 1, the mobile phone 10 includes a CPU 51, an antenna 52, a transceiver 53, a display unit 54, an input unit 55, a timer 56, a power activation signal generation circuit 57, a regulator 58, a battery 59 and a memory 60.

  CPU51 performs each process, such as a transmission / reception process, according to the program which the mobile telephone 10 mounts. Further, the CPU 51 has a function of turning off the power of the mobile phone 10 or turning on the power of the mobile phone 10. Specifically, the CPU 51 turns off or on the power of the mobile phone 10 by turning off or on the power of each device mounted on the mobile phone 10 in a power circuit (not shown) provided in the mobile phone 10. To do.

  In addition, the CPU 51 determines an interruption time (hereinafter referred to as power-off time) from when the mobile phone 10 is turned off to when it is turned on based on the length of time that the mobile phone 10 is outside the wireless area. It has a function to determine. In the present embodiment, CPU 51 determines the power-off time so as to increase as the time during which mobile phone 10 is outside the wireless area increases.

  The transceiver 53 has a function of transmitting and receiving wireless signals via the antenna 52. Further, the transceiver 53 has a function of demodulating the received signal and outputting the demodulated signal to the CPU 51. The display unit 54 has a function of displaying various information according to instructions from the CPU 51. For example, the display unit 54 displays that the wireless area is within or outside the area according to the instruction of the CPU 51.

  Specifically, the input unit 55 is a key operation unit of the mobile phone 10 and includes, for example, a power switch (not shown). In the present embodiment, when the power switch of the input unit 55 is pressed by the user, the CPU 51 inputs a power-on signal from the input unit 55 to turn on the mobile phone 10.

  The timer 56 has a function of outputting a time signal to the CPU 51 and the power supply activation signal generation circuit 57. The power activation signal generation circuit 57 has a function of measuring an elapsed time since the power of the mobile phone 10 is turned off based on a time signal from the timer 56 when the power of the mobile phone 10 is turned off. For example, the power activation signal generation circuit 57 measures the time elapsed since the power of the mobile phone 10 was turned off by counting pulses generated by the timer 56 as a time signal.

  In addition, the power activation signal generation circuit 57 receives an interrupt signal (hereinafter referred to as a power activation signal) that instructs automatic activation of the power of the mobile phone 10 when a predetermined time (power cut-off time) elapses after the power of the mobile phone 10 is turned off. It has a function to generate. The power activation signal generation circuit 57 has a function of outputting the generated power activation signal to the CPU 51 and causing the CPU 51 to turn on the power of the mobile phone 10.

  The regulator 58 has a function of converting the power supplied from the battery 59 into a predetermined voltage value and supplying it to the CPU 51. The memory 60 stores various programs and data processed by the mobile phone 10. The memory 60 stores the number of times (hereinafter referred to as out-of-service count value) i that the mobile phone 10 is continuously determined to be out of the wireless area. In addition, the memory 60 stores the number of times (hereinafter referred to as a power-off count value) X that the mobile phone 10 is continuously turned off.

  In the present embodiment, CPU 51 performs a cell search and counts out-of-service count value i when it is determined that mobile phone 10 is out of the wireless service area. The CPU 51 counts the power-off count value X when the power of the mobile phone 10 is automatically turned off. The memory 60 stores the out-of-service count value i and the power-off count value X counted by the CPU 51. Note that the out-of-service count value i and the power-off count value X may not be stored in the memory 60, but may be stored in, for example, an EEPROM provided in the power supply activation signal generation circuit 57.

  Next, the operation will be described. FIG. 2 is a flowchart illustrating an example of the power saving control process executed by the power saving device mounted on the mobile phone 10. The mobile phone 10 performs a cell search (step S101). For example, the mobile phone 10 performs a cell search at a predetermined timing, and recognizes a wireless area where the mobile phone 10 is located. In addition, the cellular phone 10 performs a cell search every time the power is automatically turned on as will be described later.

  The CPU 51 of the mobile phone 10 determines whether or not the mobile phone 10 is currently outside the wireless area (step S102). For example, the CPU 51 determines whether or not the user is out of the radio area by determining the reception state such as whether or not communication with the radio base station is possible based on the level of the received signal from the transceiver 53. In addition, for example, the CPU 51 determines whether or not the user is out of the wireless area based on the location registration information received by the transceiver 53. If it is determined that the mobile phone 10 is within the wireless area, the mobile phone 10 ends the process.

  When determining that the user is out of the radio area, the CPU 51 determines whether or not the out-of-service count value i stored in the memory 60 is equal to or greater than a predetermined value N (step S103). That is, the CPU 51 determines whether or not the number of times that the cell search has been performed and determined that the mobile phone is out of the wireless area is N times or more. The mobile phone 10 stores, for example, N in the memory 60 in advance as a predetermined unique fixed value. Further, for example, the mobile phone 10 may arbitrarily set a value of N based on an input from the input unit 55 in accordance with a user operation.

  When determining that the out-of-service count value i is not N or more, the CPU 51 adds 1 to the out-of-service count value i stored in the memory 60 and updates it. Further, the CPU 51 waits for a predetermined time (step S104), and repeats the processing after step S101 again. For example, the CPU 51 waits for a predetermined time by measuring the elapsed time based on the time signal output from the timer 56, and repeatedly executes the processing after step S101. If the CPU 51 determines that the out-of-service count value i is greater than or equal to N, the CPU 51 initializes (clears) the out-of-service count value i stored in the memory 60, and executes the processing from the next step S105.

  If it is determined that the out-of-service count value i is greater than or equal to N, the power activation signal generation circuit 57 starts measuring time based on the time signal from the timer 56 (step S105). Further, the CPU 51 turns off the power of the mobile phone 10 (step S106). That is, the mobile phone 10 turns off the power and starts measuring the elapsed time after the power is turned off. Further, the CPU 51 turns off the power of devices mounted on the mobile phone 10 other than the timer 56 and the power activation signal generation circuit 57.

  The CPU 51 determines whether or not a power-on signal is input from the input unit 55 (step S107). That is, the CPU 51 determines whether or not the power switch is manually pressed by the user in the power-off state. When determining that the power-on signal has been input, the CPU 51 turns on the power of the mobile phone 10 (step S108), and ends the process. That is, when a power-on operation is manually performed by the user, the CPU 51 prioritizes the user operation and turns on the mobile phone 10 even when the power saving control process is being executed.

  If it is determined that the power-on signal has not been input, the power activation signal generation circuit 57 determines whether or not a predetermined time (power-off time) t has elapsed since the start of time measurement in step S105 (step S105). S109). If it is determined that the power-off time t or more has not elapsed, the mobile phone 10 repeatedly executes the processes after step S107.

  If it is determined that the power-off time t or more has elapsed, the power activation signal generation circuit 57 generates a power activation signal instructing to turn on the power and outputs it to the CPU 51. Then, the CPU 51 turns on the mobile phone 10 in accordance with the power activation signal input from the power activation signal generation circuit 57 (step S110). In the present embodiment, the CPU 51 turns on the power of all the devices of the mobile phone 10 including the timer 56 and the power activation signal generation circuit 57. Then, the cellular phone 10 returns to the process of step S101 and repeats the processes after the cell search again.

  Through the above processing, power saving control is performed until the mobile phone 10 returns to the wireless area or until the user manually presses the power key.

  Next, an operation when the power saving control process is executed while changing the power-off time from the power-off to the power-on according to the length of time that the mobile phone 10 is outside the wireless area will be described. FIG. 3 is a flowchart illustrating an example of the power saving control process when the power saving control is performed according to the length of time that the mobile phone 10 is outside the wireless area.

  Similar to steps S101 to S104 shown in FIG. 2, the mobile phone 10 performs a cell search (step S201), and determines whether or not it is currently out of the wireless area (step S202). When determining that the user is out of the wireless area, the CPU 51 determines whether or not the out-of-service count value i stored in the memory 60 is equal to or greater than a predetermined value N. If not greater than N, the CPU 51 waits for a predetermined time (step S204). The processing after step S201 is repeatedly executed again.

  When determining that the out-of-service count value i is N or more, the CPU 51 adds 1 to the power-off count value X stored in the memory 60 and updates it (step S205). Further, similarly to step S105 and step S106 shown in FIG. 2, the power activation signal generation circuit 57 starts measuring time (step S206), and the CPU 51 turns off the power of the mobile phone 10 (step S207). That is, the mobile phone 10 updates the power-off count value X by turning off the power, and starts measuring the elapsed time since the power is turned off.

  Similarly to steps S107 and S108 shown in FIG. 2, the CPU 51 determines whether or not a power-on signal is manually input by the user (step S208). 10 is turned on (step S209).

If it is determined in step S208 that no power signal is input, the CPU 51 determines the power-off time based on the power-off count value X stored in the memory 60. For example, the memory 60 stores in advance a correspondence table that associates and power-off count value X and the power-off time t _x. Then, the CPU 51 determines the power-off time by extracting the power-off time t _x corresponding to the power-off count value X from the correspondence table. Further, for example, the CPU 51 may set the power-off time by an input from the input unit 55 in accordance with a user operation.

Figure 4 is an explanatory diagram showing an example of a correspondence table between the power-off count value X and the power-off time t _x. 4, correspondence tables, power offset count 1, 2, 3, · · ·, n, · · · and power-off time _{t 1, t 2, t 3} , ···, t n, ... in association with each other. In the present embodiment, in the correspondence table, the value of the power-off time t _x is determined in advance so that t _n ≧ t _n−1 . That is, it is determined that the power-off time becomes longer as the number of times the mobile phone 10 is continuously turned off automatically increases. By doing so, as the time during which the mobile phone 10 is out of the wireless area becomes longer, the power saving of the mobile phone 10 is increased so that the time from when the power is automatically turned off to when it is turned on again becomes longer. Control can be performed.

Power supply activation signal generating circuit 57, from the start of measurement of the elapsed time in step S206, whether the lapse determined power-off time t _x or whether the judged (step S210). If it is determined not to have elapsed power-off time t _x above, the cellular phone 10 and repeatedly executes step S208 and subsequent steps. If it is determined that the elapsed power-off time _{t x} above, as in step S110 shown in FIG. 2, power supply activation signal generating circuit 57 outputs a power start signal to the CPU 51, CPU 51 turns on the power supply of the mobile phone 10 ( Step S211). Then, the mobile phone 10 returns to the process of step S201 and repeatedly executes the processes after the cell search.

  If it is determined in step S202 that the mobile phone 10 is out of the wireless area, or if the mobile phone 10 is turned on in step S209, the mobile phone 10 initializes (clears) the power-off count X stored in the memory 60 ( Step S212), the process is terminated.

  If the mobile phone 10 is turned on in step S211, and if it is determined in step S202 that the mobile phone 10 is out of the wireless area again, the CPU 51 sets the time until the mobile phone 10 is turned off again. May be. Then, the CPU 51 may turn off the power of the mobile phone 10 again on the condition that the set predetermined time has elapsed. In this case, the CPU 51 may set a time until the power of the mobile phone 10 is turned off again by an input from the input unit 55 in accordance with a user operation.

  As described above, according to the present embodiment, mobile phone 10 automatically turns off the power when it is determined that the mobile phone 10 is out of the wireless area by cell search. In addition, the mobile phone 10 automatically turns on again when a predetermined power-off time elapses after the power is turned off. By repeatedly disconnecting the power source of the mobile phone 10 for a predetermined time, it is possible to reduce unnecessary power consumption.

  Further, according to the present embodiment, the mobile phone 10 determines the power-off time based on the power-off count value. Since the power-off time is set so as to increase as the number of times the power is automatically turned off continuously increases, the power-off time is set so as to increase as the time during which the mobile phone 10 is out of the wireless area increases. Can be set. Therefore, when the mobile phone 10 stays outside the wireless area for a long time, it is possible to lengthen the time until the mobile phone 10 is automatically turned off and then turned on again. The number of cell searches per hour can be reduced. Therefore, even when the mobile phone 10 remains outside the radio area for a long time, the mobile phone 10 can efficiently save power.

Note that in the power saving control process shown in FIG. 3, may be set an upper limit value of the power-off time t _x. For example, the power activation signal generation circuit 57 determines whether or not the power off count value X is equal to or greater than a predetermined upper limit value p. If the power off count value X is equal to or greater than the upper limit value p, a predetermined upper limit is set as the power-off time t _x. it is also possible to determine the time t _p. Further, e.g., power supply activation signal generating circuit 57 in accordance with operation of the user, may be set the upper limit time t _p by an input from the input unit 55. Then, in step S210 of FIG. 3, the power supply start signal generation circuit 57, the power supply automatically after off of the mobile phone 10, be configured to determine whether or not older than a predetermined upper limit time t _p Good. By doing so, when power saving control of the mobile phone 10 is performed, it is possible to prevent the time for turning off the power of the mobile phone 10 from becoming unlimited.

Further, the power activation signal generation circuit 57 may determine the power-off time based on the battery capacity of the mobile phone 10. For example, in step S210 in FIG. 3, the mobile phone 10 obtains the current battery capacity. Further, the power supply start signal generating circuit 57, based on the battery capacity determined according to the battery capacity of the mobile phone 10 is reduced, to determine the power-off time t _x to be longer. By doing so, it is possible to lengthen the time from when the power of the mobile phone 10 is automatically turned off to when it is turned on again as the battery capacity decreases. Therefore, even when the battery capacity of the mobile phone 10 is low, the battery of the mobile phone 10 can be made to last longer.

Further, the power activation signal generation circuit 57 may determine the power-off time based on the elapsed time from when the user has recently performed an operation. For example, in step S <b> 210 of FIG. 3, the mobile phone 10 obtains an elapsed time since the user last operated a key or closed the mobile phone 10. Further, the power supply start signal generating circuit 57, based on the elapsed time determined in accordance with the elapsed time since the last user operation becomes longer, determines the power-off time t _x to be longer. By doing so, when the frequency of use by the user is low, the time from when the power of the mobile phone 10 is automatically turned off to when it is turned on can be made longer. Therefore, the power saving of the mobile phone 10 when the usage frequency of the user is low can be performed more efficiently.

  The present invention can be applied to power-saving applications of mobile terminals such as mobile phones and PHS. In particular, when the mobile terminal stays outside the wireless area for a long time, the power consumption of the mobile terminal can be more efficiently performed.

It is a block diagram which shows an example of a structure of the power saving system of the portable terminal to which the power saving apparatus by this invention is applied. 5 is a flowchart illustrating an example of a power saving control process executed by a power saving device mounted on the mobile phone 10; 10 is a flowchart illustrating an example of a power saving control process when the power saving control is performed according to the length of time that the mobile phone 10 is outside the wireless area. Power Off count value X and the power-off time is an explanatory diagram showing an example of a correspondence table between t _x.

Explanation of symbols

10 Mobile phone 51 CPU
52 Antenna 53 Transceiver 54 Display 55 Input Unit 56 Timer 57 Power Start Signal Generation Circuit 58 Regulator 59 Battery 60 Memory

Claims (11)

A power saving device that realizes power saving of a mobile terminal by controlling a power source,
Out-of-service determining means for determining whether or not the mobile terminal is out of a wireless area;
Power control means for turning off the mobile terminal or turning on the mobile terminal;
Time determining means for determining a set time from when the power supply control means turns off the power of the mobile terminal to when the power of the mobile terminal is turned on again;
Time elapse judgment means for judging whether or not the set time determined by the time determination means has elapsed since the power supply control means turned off the portable terminal,
The power control means turns off the power of the mobile terminal when the mobile terminal is determined to be out of the radio area by the out-of-service determination means, and turns off the power of the mobile terminal after the time elapse determination means If it ’s determined that more than a certain amount of time has passed,
The out-of-service determining means determines whether or not the mobile terminal is out of the radio area each time the power control means turns on the mobile terminal.
The time determination means determines the set time so as to increase as the time during which the mobile terminal is out of the wireless area increases.   2. The power saving apparatus according to claim 1, wherein the time determining means determines the set time so as to increase as the number of times the power supply control means turns off the portable terminal increases.   If the time elapse determining means determines that the number of times the power supply control means turns off the mobile terminal is greater than or equal to a predetermined upper limit, the power control means turns off the power of the mobile terminal and then sets The power saving apparatus according to claim 2, wherein it is determined whether or not a predetermined upper limit time as a time has elapsed. The power control means includes a set time storage means for storing the number of times the mobile terminal is turned off and the set time in association with each other,
The power saving apparatus according to claim 2 or 3, wherein the time determination unit extracts a set time corresponding to the number of times the power source control unit has turned off the mobile terminal from the set time storage unit. Battery capacity calculating means for determining the battery capacity of the mobile terminal,
The time determination means determines the set time so as to become longer as the battery capacity of the mobile terminal decreases based on the battery capacity obtained by the battery capacity calculation means. The power saving device according to claim 1. A time calculating means for obtaining an elapsed time since the user operation was last performed;
The time determination means determines the set time so as to become longer as the elapsed time from the last time when the user operation was performed based on the elapsed time obtained by the time calculation means. Item 6. The power saving apparatus according to any one of Items 5 to 5. A time input setting means for setting a set time according to a user input instruction;
The time elapse determination means determines whether or not a set time set by the time input setting means has elapsed since the power supply control means turned off the portable terminal. The power saving device according to claim 1. After the power supply control means turns on the power of the mobile terminal, the time until the mobile terminal is turned off again is set when the mobile terminal is judged to be out of the wireless area by the out-of-service determination means Power off time setting means,
The said power supply control means turns off the power supply of the said portable terminal again on condition that the time set by the said power-off time setting means passed. The one of the Claims 1-7. Power saving device.   The power saving apparatus according to claim 8, wherein the power-off time setting means sets a time until the power of the portable terminal is turned off again in accordance with a user input instruction. A portable terminal equipped with a power saving device that realizes power saving by controlling a power source,
The power saving device is:
Out-of-service determining means for determining whether or not the mobile terminal is out of a wireless area;
Power control means for turning off the mobile terminal or turning on the mobile terminal;
Time determining means for determining a set time from when the power supply control means turns off the power of the mobile terminal to when the power of the mobile terminal is turned on again;
Time elapse judgment means for judging whether or not the set time determined by the time determination means has elapsed since the power supply control means turned off the portable terminal,
The power control means turns off the mobile terminal when the out-of-service determination means determines that the mobile terminal is out of the wireless area, and turns off the power of the mobile terminal and then passes the time after the time elapse determination means. When it is determined that the set time has passed, the mobile device is turned on again,
The out-of-service determining means determines whether or not the mobile terminal is out of a radio area each time the power control means turns on the mobile terminal.
The mobile terminal characterized in that the time determination means determines the set time so as to increase as the time during which the mobile terminal is outside the radio area increases. A power saving method for realizing power saving of a mobile terminal by controlling a power source,
Determining whether or not the mobile terminal is out of a wireless area each time the mobile terminal is turned on;
If it is determined that the mobile terminal is out of a wireless area, turning off the mobile terminal;
Determining a set time from turning off the portable terminal to turning on the portable terminal again, so that the portable terminal is out of a wireless area longer as the time is longer;
Determining whether or not the set time has elapsed since turning off the mobile terminal;
And a step of turning on the power of the mobile terminal again when it is determined that the set time has passed since the power of the mobile terminal was turned off.

Images