JP2008028821A - Cordless phone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cordless phone which determining that on which charging base a slave unit is placed after the end of telephone call without worrying. <P>SOLUTION: The cordless phone is provided with a master unit, a slave unit, and a charging base. The slave unit has a radio transmission means for wirelessly transmitting a disconnection signal for informing disconnection of communication line. The charging base is provided with: a placing detection means for detecting whether the slave unit is placed; a radio reception means for starting reception of the disconnection signal after detecting that the slave unit is not placed by the placing detection means; and a first informing means for informing the reception outside by output of sound or light when the radio reception means receives the disconnection signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cordless telephone, and more particularly to a cordless telephone that can be suitably used when the cordless telephone includes a plurality of slave units and a charging stand.

  In general, a cordless telephone can be used apart from a parent device and can be used in a variety of scenes such as home use and office use.

  In the case of home use, a conventional cordless telephone includes about two slave units that are wirelessly connected to a master unit that is a communication line connection device. This handset is a handset having a wireless connection function, and has a battery for wireless connection. And in order to charge this battery, the subunit | mobile_unit is each mounted in the charging stand provided with a charging function.

  The cordless telephone handset cannot be used unless the battery is charged. For this reason, the slave unit after the end of the call is placed on the charging stand for the slave unit user by outputting a warning sound from the speaker or flashing with a light emitting element after a certain period of time. (See Patent Document 1).

JP-A-11-127227

  However, conventional cordless telephones are used not only for home use but also for office use. In the case of office use, the number of slave units may be 10 or more. For this reason, it is often the case that forgetting or not being able to specify the charging stand on which the slave unit is placed after the call ends, and it is often wondering which charging stand the slave unit can be placed on. It was.

  In particular, when a call is made by handing a handset from another person, the caller cannot determine on which charging stand to place it based on his memory. Therefore, in that case, it is necessary to ask another person who has taken the phone or to visually check each charging stand that is not placed one by one, which is very troublesome. In addition, time for searching for a charging stand and worrying about which charging stand to place is also wasted.

  Further, the slave unit after the end of the call continues to prompt the user of the slave unit to place it on the charging stand by a sound or light output after a certain period of time has elapsed. If the handset user cannot immediately identify which charging stand to place, the handset's voice output or light emission continues until the handset is placed on the charging stand. The more you pass, the more you feel uncomfortable.

  Therefore, the present invention has been made in view of these points, and it is an object of the present invention to provide a cordless telephone that can make a judgment without worrying about which charging stand to place the slave unit after the call ends. It is aimed.

  In order to achieve the object described above, a cordless telephone according to the present invention includes, as a first aspect, a master unit connected to a communication line, a slave unit wirelessly connected to the master unit, and a slave unit. And a charging base for charging a battery built in the slave unit during placement. The slave unit has a wireless transmission unit that wirelessly transmits a disconnection signal notifying the disconnection of the communication line, and the charging stand includes a placement detection unit that detects whether the slave unit is placed, and a placement detection unit. Wireless receiving means for starting reception of a disconnection signal after detecting that the slave unit is not placed by the means, and when the wireless reception means receives the disconnection signal, the reception is made external by sound or light output. It has the 1st alerting | reporting means to alert | report, It is characterized by the above-mentioned.

  According to the cordless telephone of the first aspect of the present invention, sound and light can be output from the charging stand based on the presence / absence of the slave unit and the reception status of the disconnection signal. When returning the machine to the charging stand, it is possible to search for the charging stand on which the slave unit is placed, relying on sound output or light emission.

  The cordless telephone according to the second aspect of the present invention is the cordless telephone according to the first aspect, characterized in that the handset has input means for inputting the start of transmission of a disconnection signal.

  According to the cordless telephone of the second aspect of the present invention, it is possible to arbitrarily start transmission of the disconnection signal by the caller's input operation. When searching for a charging stand on which the machine is placed, the charging stand on which the slave is placed can be searched using sound output or light emission.

  The cordless telephone according to the third aspect of the present invention is the cordless telephone according to the first or second aspect, wherein the handset notifies the outside by sound or light output based on the start of transmission of the disconnection signal. It has the means.

  According to the cordless telephone of the third aspect of the present invention, when the handset is not placed on the charging stand after the end of the call, it is possible to output sound and light from the handset. The machine can be prompted to rest on the charging stand.

  The cordless telephone of the fourth aspect of the present invention is characterized in that, in the cordless telephone of the third aspect, the second notification means notifies in synchronization with the notification by the first notification means based on the disconnection signal. Yes.

  According to the cordless telephone of the fourth aspect of the present invention, since the sound or light output related to the slave unit and the charging base is synchronized, even if there are a plurality of charging bases that output sound or emit light, You can search for a charging stand by relying on the synchronization status.

  The cordless telephone according to the fifth aspect of the present invention is the cordless telephone according to any one of the first to fourth aspects, wherein the detector used for the placement detecting means contacts the handset when the battery is charged. It is a contactor.

  According to the cordless telephone of the fifth aspect of the present invention, since the detector and the contact can be shared without being formed separately, the shape change and the reliability of the cordless telephone causing an increase in manufacturing cost. It is possible to prevent an increase in the number of contact elements that cause a decrease in the resistance.

  The cordless telephone according to a sixth aspect of the present invention is the cordless telephone according to any one of the first to fifth aspects, wherein the wireless transmission means and the wireless reception means switch the frequency of the disconnection signal to be transmitted or received. It is characterized by having each.

  According to the cordless telephone of the sixth aspect of the present invention, a cordless handset and a charging stand on which the cordless handset is placed are set as one cordless handset set, and a disconnection signal transmitted or received according to each cordless handset set Since the frequency can be switched by the frequency switching means, even if there are a large number of charging bases, it is possible to reliably identify which charging base the slave unit is placed on.

  The cordless telephone according to the seventh aspect of the present invention is the cordless telephone according to any one of the first to sixth aspects, wherein the first notification means and the second notification means start from the notification until the end. It has the feature that it has a notification duration switching means for switching the duration.

  According to the cordless telephone of the seventh aspect of the present invention, since the notification from the charging stand and the slave unit can be limited only within a certain time from the reception of the disconnection signal, the slave unit is mounted on the charging stand after the end of the call. Even if it is not placed, it is possible to automatically stop sound output and light emission that start to feel uncomfortable due to a long-time notification after a certain period of time. Moreover, useless power consumption caused by long-time notification can be suppressed. Further, when the cordless telephone of the seventh aspect also has input means for inputting the start of transmission of the disconnection signal, like the cordless telephone of the second aspect, the transmission start of the disconnection signal is input by the input means. For example, even if the notification is automatically stopped after a certain time has elapsed, the notification from the charging stand can be performed again.

  A cordless telephone according to an eighth aspect of the present invention is the cordless telephone according to any one of the first to seventh aspects, wherein the wireless transmission means and the wireless reception means are wireless communication means formed using Bluetooth technology. It is characterized by that.

  According to the cordless telephone of the eighth aspect of the present invention, the wireless transmission means and the wireless reception means can be reduced in size and weight, and the power consumption thereof can be reduced. The above-described operation of the present invention can be enjoyed without doing so.

  The cordless telephone of the ninth aspect of the present invention is the cordless telephone of any one of the first to eighth aspects, wherein the first notification means stops the notification when the charging of the battery is started. It is a feature.

  According to the cordless telephone of the ninth aspect of the present invention, since the notification of the charging stand can be automatically stopped in conjunction with the start of the charging of the battery, the handset user places the handset on the charging stand. It is possible to stop the notification of the charging stand by simply making it.

  According to the cordless telephone of the present invention, when the call is finished and the handset is returned to the charging stand, the charging stand on which the handset is placed outputs a sound or emits light after the call ends, and relies on the sound output or light emission. Thus, it is possible to search for the charging stand, so that it is possible to determine without having to worry about which charging stand to place the slave unit after the call is over.

  The cordless telephone according to the present invention will be described below with reference to FIGS.

  FIG. 1 is a block diagram conceptually showing the cordless telephone 1 of the present embodiment. As shown in FIG. 1, the cordless telephone 1 according to the present embodiment includes a parent device 10, a child device 20, and a charging stand 30.

  The base unit 10 is a communication connection device having a communication circuit 12 and a wireless connection circuit 11. The communication circuit 12 is connected to a communication line via a telephone line 15 and is configured to transmit / receive communication data to / from the wireless connection circuit 11 and the wired handset 14. The wireless connection circuit 11 is a high-frequency circuit for performing transmission / reception of communication data by wireless connection, and is formed so as to transmit / receive radio waves for connection to the slave unit 20 from the antenna 13 connected to the wireless connection circuit 11. Yes.

  The subunit | mobile_unit 20 has the wireless connection circuit 21, the battery 22, the transmission circuit 23, the alerting | reporting circuit 24, the operation button 26, and the control circuit 25.

  The wireless connection circuit 21 is a high-frequency circuit for performing transmission / reception of communication data by wireless connection, similar to the wireless connection circuit 11 of the parent device 10, and is connected to the parent device 10 from an antenna 29 connected to the wireless connection circuit 21. It is formed so as to transmit and receive radio waves.

  The battery 22 is a drive source for driving the wireless connection circuit 21, the transmission circuit 23, the notification circuit 24, and the control circuit 25, and is charged through two connected metal contacts 22a and 22b. It is formed to be able to.

  The transmission circuit 23 is a high-frequency circuit that generates a radio wave of a specific frequency that becomes a disconnection signal that notifies the disconnection of the communication line, and is used as a wireless transmission unit of the present invention. The transmission circuit 23 of the present embodiment is formed using the Bluetooth technology and is used as the wireless communication means of the present invention.

  The notification circuit 24 is a circuit that outputs a sound from the speaker 27 and blinks or lights the light emitting element 28, and is used as the second notification means of the present invention. In addition, the notification circuit 24 synchronizes with the sound output and light emission by the notification circuit 34 of the charging stand 30 after a predetermined time has elapsed (for example, three minutes later) after receiving the disconnection signal transmitted from the transmission circuit 23. It is configured to output and emit light.

  The operation button 26 has a plurality of symbols such as numerals 0 to 9 and symbols such as a call start mark (icon in which the handset is lifted) and a call end mark (icon in which the handset is returned to the original position). This is an input button. This operation button 26 can be used not only to input a telephone number but also to input a disconnection signal transmission start, to switch the frequency of the disconnection signal, and to set a notification start time and a notification continuation time. Is formed. Therefore, this operation button 26 is used together with the control circuit 25 as input means, frequency switching means, and notification duration switching means of the present invention. In addition, it is preferable that this operation button 26 can also adjust the sound volume and the light emission amount related to the notification.

  The control circuit 25 is connected to the wireless connection circuit 21, the battery 22, the transmission circuit 23, the notification circuit 24, and the operation button 26, and performs wireless connection with the base unit 10, supply of drive voltage, transmission of a disconnection signal and notification. It is a circuit to control. Further, the control circuit 25 is configured to perform control to arbitrarily switch the frequency of the disconnection signal, the notification start time, and the notification continuation time by an input from the operation button 26.

  FIG. 2 shows a control flow by the control circuit 25 of the slave unit 20. As shown in FIG. 2, when the control circuit 25 of the handset 20 detects the end of the call based on the connection status of the wireless connection circuit 21 (S 1), whether or not the start of transmission of the disconnect signal is input by operating the operation button 26. Is confirmed (S2). The transmission circuit 23 controlled by the control circuit 25 waits for an input from the operation button 26 (for example, a call end button operated at the end of the call) and starts transmitting a disconnection signal (S3).

  When a certain time (for example, 3 minutes) elapses from the start of transmission of the disconnection signal (S4), the notification circuit 24 controlled by the control circuit 25 starts notification by voice output and light emission (S5). Further, when a certain time (for example, 5 minutes from the start of transmission of the disconnection signal) has elapsed since the start of transmission of the disconnection signal (S6), the notification circuit 24 controlled by the control circuit 25 stops the notification (S7). Here, when the start of transmission of the disconnection signal is input again by operating the operation button 26 after the notification is stopped (S8), transmission of the disconnection signal is started again (S3). If the start of transmission of the disconnect signal is not input by operating the operation button 26 (S8), the control by the control circuit 25 is finished.

  After the transmission of the disconnection signal is first or again (S3) and before a certain time has elapsed from the start of the transmission of the disconnection signal (S4 and S6), the control circuit 25 determines whether charging of the battery 22 has started. (S9). When charging of the battery 22 is started (S9), the slave unit 20 is placed on the charging stand 30, so that the notification circuit 24 controlled by the control circuit 25 stops notification (S10), and the control circuit 25 The control by is terminated. Also, if charging of the battery 22 has not started before a certain time has elapsed (S4 and S6) (S9), the notification circuit 24 starts notification after a certain time has elapsed since the start of transmission of the disconnection signal (S4). (S5). Thereafter, the same control as described above is performed (S3 to S10).

  As shown in FIG. 1, the casing 31 of the charging stand 30 is formed in a shape to be placed while gripping the lower part of the slave unit 20. The charging stand 30 has a charging circuit 32, a receiving circuit 33, a notification circuit 34, and a control circuit 35 inside the casing 31.

  The charging circuit 32 supplies the drive voltage supplied from the external power source via the supply line 32c to the battery 22 of the slave unit 20 via the two metal contacts 32a and 32b, and controls the charging stand 30. The driving voltage is supplied to the receiving circuit 33, the notification circuit 34 and the control circuit 35 through the circuit 35. The contacts 32 a and 32 b of the charging stand 30 are formed at positions where they come into contact with the contacts 22 a and 22 b of the slave unit 20 when the slave unit 20 is placed on the charging stand 30. That is, since the contacts 32a and 32b of the charging stand 30 can detect the placement of the slave unit 20 when the charging of the battery 22 of the slave unit 20 is started, the “detector used for the placement detection means” of the present invention. It is used as. Therefore, the charging circuit 32 of this embodiment is used as the mounting detection means of the present invention together with the control circuit 35.

  The receiving circuit 33 is a circuit that receives a radio wave of a specific frequency used as a disconnection signal via the antenna 39, and is used as a wireless receiving means of the present invention. The receiving circuit 33 of the present embodiment is formed using the Bluetooth technology and is used as the wireless communication means of the present invention.

  The notification circuit 34 is a circuit that outputs a sound from the speaker 37 or blinks or lights up the light emitting element 38 immediately after the reception circuit 33 receives the disconnection signal or after a predetermined time has elapsed. It is used as the first notification means. As described above, the sound output and light emission of the notification circuit 34 of the charging stand 30 are performed in synchronization with the sound output and light emission of the notification circuit 24 of the slave unit 20.

  The control circuit 35 is connected to the charging circuit 32, the receiving circuit 33 and the notification circuit 34, and the contacts 32a and 32b of the charging stand 30 are not in contact with the contacts 22a and 22b of the slave unit 20, that is, the child It is configured to perform control for starting reception of the disconnection signal after detecting that the machine 20 is not placed on the charging stand 30. The control circuit 35 stops the charging of the battery 22 after a predetermined time has elapsed from the start of charging, and also indicates that the contacts 32a and 32b of the charging stand 30 have come into contact with the contacts 22a and 22b of the slave unit 20, that is, the child When the machine 20 is placed on the charging stand 30 and it is detected that charging of the battery 22 has been started, control is performed to stop notification from the charging stand 30 by sound output and light emission. Further, the control circuit 35 is connected to a rotary knob 36 disposed outside the charging base 30 and is configured to perform control for switching the frequency of the disconnection signal to be received and the notification duration time. Therefore, the control circuit 35 is used as the frequency switching means and the notification duration switching means of the present invention together with the rotary knob 36. In addition, it is preferable that this rotary knob 36 can also adjust the sound volume and light emission amount related to notification.

  FIG. 3 shows a control flow by the control circuit 35 of the charging stand 30. As shown in FIG. 3, when the contacts 22 a and 22 b of the slave unit 20 are separated from the contacts 32 a and 32 b of the charging stand 30, the control circuit 35 detects the separation of the slave unit 20 via the charging circuit 32 ( S11), the receiving circuit 33 controlled by the control circuit 35 starts receiving the disconnection signal (S12). If the communication line is still connected and no disconnection signal is transmitted from the slave unit 20, the receiving circuit 33 continues to maintain the receiving state (S13). When the communication line is disconnected and a disconnection signal is transmitted from the slave unit 20 (S3 in FIG. 2), the reception circuit 33 receives the disconnection signal (S13), and the notification circuit 34 of the charging stand 30 outputs audio and Notification by light emission is started (S14).

  Here, when a certain time (for example, 5 minutes) elapses from reception of the disconnection signal (S15), the notification circuit 34 of the charging stand 30 stops notification by voice output and light emission (S16), and the reception circuit 33 transmits the disconnection signal. It is confirmed whether or not there is (S17). When the reception circuit 33 receives the disconnection signal (S17), the notification circuit 34 starts notification again (S14). Further, when the receiving circuit 33 does not receive the disconnection signal (S17), the control by the control circuit 35 ends.

  On the other hand, before the elapse of a predetermined time from the reception of the disconnection signal (S15), the control circuit 35 determines whether or not the slave units 32a and 32b of the charging stand 30 are in contact with the contact units 22a and 22b of the slave unit 20. The presence or absence of 20 is confirmed (S18). If there is placement of the handset 20 (S18), the notification from the charging stand 30 is stopped (S19), and the control by the control circuit 35 is finished. If there is no placement of the slave unit 20 (S18), the control circuit 35 checks whether or not a predetermined time has elapsed since the reception of the disconnection signal (S15). Thereafter, the same control as described above is performed (S15 to S19).

  Next, the operation of the cordless telephone 1 according to the present embodiment will be described with reference to FIGS.

  As shown in FIG. 1, the cordless telephone 1 according to the present embodiment includes the above-described parent device 10, the child device 20, and the charging stand 30. And the subunit | mobile_unit 20 has the transmission circuit 23, and the charging stand 30 has the charging circuit 32, the receiving circuit 33, and the alerting | reporting circuit 34 which were controlled by the control circuit 35. FIG. As shown in FIG. 2, the transmission circuit 23 transmits a disconnection signal after the end of the call (S <b> 1 to S <b> 3), and as shown in FIG. 3, the charging circuit 32 has the contacts 32 a and 32 b of the slave 20. The placement of the slave unit 20 is detected based on whether or not the slave units 22a and 22b are in contact with each other (S11), and the receiving circuit 33 recognizes that the control unit 35 that controls the charging circuit 32 has no placement of the slave unit 20 From this time, reception of a disconnection signal is started (S12). When the receiving circuit 33 receives the disconnection signal, the notification circuit 34 notifies the reception to the outside by output of sound and light (S13, S14). Thereby, a sound can be output from the charging stand 30 or light can be emitted based on the presence / absence of the handset 20 and the reception status of the disconnection signal. Therefore, when the telephone call is finished and the handset 20 is returned to the charging stand 30, the charging stand 30 on which the handset 20 is placed can be searched depending on sound output or light emission.

  Here, as shown in FIG. 1, the charging stand 30 uses contacts 32 a and 32 b of the charging circuit 32 as detectors for detecting whether or not the slave unit 20 is placed on the charging stand 30. This eliminates the need to form the detectors and the contacts 32a and 32b independently, thereby preventing an increase in the number of contact elements and enjoying the operation of the present embodiment without reducing the reliability. it can. In addition, since the contacts 32a and 32b of the charging circuit 32 are shared as detectors, an increase in manufacturing cost can be prevented without changing the shape of the cordless telephone 1.

  Moreover, the subunit | mobile_unit 20 of this embodiment has the operation button 26 as shown in FIG. 1, and can input the transmission start of a cutting | disconnection signal by operation of the operation button 26 as shown in FIG. (S2). Therefore, as shown in FIG. 2, at the end of the call, a disconnection signal can be transmitted unconsciously at the same time as the end of the call by operating the call end button, which must be performed (S2). In addition, after a predetermined time has elapsed, transmission of a disconnection signal can be arbitrarily started by the caller's input operation (S8). For example, even when searching for the charging stand 30 on which the handset 20 has been placed after a predetermined time has elapsed, a disconnection signal is transmitted from the transmission circuit 23 of the handset 20 by operating a call end button or a disconnection signal transmission dedicated button. (S8, S3), it is possible to search for the charging base 30 on which the handset 20 is placed by relying on voice output or light emission even after a predetermined time has elapsed.

  Furthermore, the subunit | mobile_unit 20 of this embodiment is provided with not only the transmission circuit 23 but the alerting | reporting circuit 24, as shown in FIG. For example, the notification circuit 24 is controlled by the control circuit 25 so that sound is output and light is emitted after a predetermined time has elapsed since the disconnection signal was transmitted. Therefore, the caller can be urged to place the handset 20 on the charging stand 30, so that the handset 20 can be prevented from being unusable due to insufficient charging of the battery 22 of the handset 20. .

  The notification circuit 24 of the child device 20 is controlled by the control circuit 25 so as to notify in synchronization with the notification by the notification circuit 34 of the charging stand 30. In the case of office use, there may be a large number of, for example, 10 sets of slave units 20 and charging bases 30 for one base unit 10, and a large number of slave units 20 and charging bases 30 perform notification simultaneously and independently. If it stops, it will be worried about which charging stand 30 can place the subunit | mobile_unit 20 after the telephone call end. That is, even if there are a large number of charging bases 30 that output sound or emit light by synchronizing the notifications of the handset 20 and the charging base 30, the charging base 30 on which the handset 20 is placed depending on the synchronization state. Can be searched.

  And in the subunit | mobile_unit 20 of this embodiment, the operation button 26 is connected to the control circuit 25 which controls the transmission circuit 23, as shown in FIG. Further, in the charging stand 30, a rotary knob 36 is connected to a control circuit 35 that controls the receiving circuit 33. The operation buttons 26 and the rotary knob 36 are formed so that the frequency of a cutting signal to be transmitted or received can be switched by operating them. Therefore, since the number of charging bases 30 that can be received with respect to a disconnection signal of a specific frequency transmitted from one slave unit 20 can be limited to one, the number of charging bases 30 is large. Even so, it is possible to reliably identify on which charging stand 30 the slave unit 20 is placed.

  The control circuits 25 and 35 of the slave unit 20 and the charging stand 30 are connected to the notification circuits 24 and 34, and the operation button 26 and the rotary knob 36 are operated to operate the notification start time. And notification duration time can be switched. The notification from the child device 20 and the charging stand 30 often feels uncomfortable for a person other than the user of the child device 20, and the user of the child device 20 himself / herself also feels uncomfortable. It is often uncomfortable if notification from is continued for a long time. In the slave unit and the charging stand of this embodiment, various setting values are changed by input from the operation button 26 and the rotary knob 36, and notification is started after a lapse of a certain time from reception of the disconnection signal. The notification can be limited to only within a certain period of time since the start of notification. Therefore, even if the handset 20 is not placed on the charging stand 30 after the end of the call, the voice output or light emission that is unpleasant due to the long-time notification is automatically stopped after a predetermined time, and the discomfort due to the notification is prevented. It can be reduced. In addition, useless power consumption caused by long-time notification can be suppressed.

  Of course, when the notification from the slave unit 20 and the charging stand 30 stops, the charging stand 30 on which the slave unit 20 is placed is searched by relying on sound output or light emission, or the slave unit 20 is placed on the charging stand 30. Although it becomes impossible to prompt the user to place the device, the slave device 20 according to the present embodiment can transmit the disconnection signal again by the input from the operation button 26 as shown in FIG. (S8, S3), there is no worry about that. That is, if the start of transmission of the disconnect signal is input by the input of the operation button 26, even if the notification is automatically stopped after a predetermined time has passed, the notification from the charging stand 30 can be performed again as shown in FIG. (S17).

  The transmission circuit 23 and the reception circuit 33 that perform transmission / reception of the disconnection signal are formed using the Bluetooth technology. The Bluetooth technology is a technology developed for wireless communication of portable devices. By using the Bluetooth technology, not only can the transmission circuit 23 and the reception circuit 33 be reduced in size and weight, but also its power consumption. Can be reduced. Therefore, even if the transmission circuit 23 and the reception circuit 33 are provided, the shape of the slave unit or the charging stand is changed to secure the installation space, or an extra drive voltage for the slave unit 20 and the charging stand 30 is secured. Therefore, it is possible to enjoy the above-described operation of the present embodiment without greatly changing the design of the cordless telephone 1.

  As shown in FIGS. 2 and 3, the notification circuits 24 and 34 of the slave unit 20 and the charging stand 30 start charging the battery 22 of the slave unit 20 when the slave unit 20 is placed on the charging stand 30. It is controlled to stop the notification when it is done (S9, S18). That is, the notification of the charging stand 30 is automatically stopped in conjunction with the start of charging of the battery 22. Thereby, the user of the subunit | mobile_unit 20 can stop alerting | reporting of the charging stand 30 only by mounting the subunit | mobile_unit 20 on the charging stand 30, and can complete | finish safely without worrying about the search of the charging stand 30. it can.

  That is, according to the cordless telephone 1 of the present embodiment, when the call is finished and the handset 20 is returned to the charging stand 30, the charging stand 30 on which the handset 20 is placed emits sound or emits light after the call ends. Since the charging stand 30 can be searched by relying on the sound output or light emission, the charging stand 30 can be determined without worrying about which charging stand 30 the child device 20 is placed on after the call.

  In addition, this invention is not limited to embodiment mentioned above etc., A various change is possible as needed.

  For example, in the subunit | mobile_unit 20 of this embodiment, although the wireless connection circuit 21 and the transmission circuit 23 are formed separately independently, in other embodiment, the transmission circuit 23 is built in the wireless connection circuit 21, A slave unit can be formed by using them as one wireless connection circuit. In this case, a disconnection signal can be transmitted from the wireless connection circuit of the slave unit as in this embodiment. Similarly, the function of the transmission circuit 23 may be shared by the wireless connection circuit 21, and a signal for ending communication from the wireless connection circuit 21 may be used as a disconnection signal so that the reception circuit 33 can receive the signal.

The block diagram which shows notionally the cordless telephone of this embodiment Control flow by the control circuit of the slave unit of this embodiment Control flow by control circuit of charging base of this embodiment

Explanation of symbols

1 Cordless telephone
DESCRIPTION OF SYMBOLS 10 Parent machine 20 Child machine 22 Battery 22a, 22b Contact 23 Transmission circuit 24 Notification circuit 25 Control circuit 26 Operation button 30 Charge stand 32 Charging circuit 32a, 32b Contact 33 Reception circuit 34 Notification circuit 35 Control circuit 36 Rotation knob

Claims (9)

With the main unit connected to the communication line,
A slave unit wirelessly connected to the master unit;
A cordless telephone having a charging base for charging the battery built in the slave unit when the slave unit is placed,
The slave has wireless transmission means for wirelessly transmitting a disconnection signal notifying the disconnection of the communication line,
The charging stand detects the presence / absence of placement of the slave unit, and starts receiving the disconnection signal after detecting that the slave unit is not placed by the placement detection unit. And a first notification means for notifying the reception by sound or light output when the wireless reception means receives the disconnection signal. . The cordless telephone according to claim 1, wherein the cordless handset has input means for inputting the start of transmission of the disconnection signal. 3. The cordless according to claim 1, wherein the slave unit has a second notification unit that notifies the outside by sound or light output based on the start of transmission of the disconnection signal. Phone. 4. The cordless telephone according to claim 3, wherein the second notification unit performs notification in synchronization with the notification by the first notification unit based on the disconnection signal. The cordless telephone set according to any one of claims 1 to 4, wherein the detector used in the position detecting means is a contactor that contacts the slave unit when the battery is charged. . The wireless transmission unit and the wireless reception unit each include a frequency switching unit that switches a frequency of the disconnection signal to be transmitted or received. Cordless phone. The first notification unit and the second notification unit include a notification duration switching unit that switches a duration from the start of the notification to the end thereof. The cordless telephone set according to any one of items 6. The cordless telephone according to any one of claims 1 to 7, wherein the wireless transmission unit and the wireless reception unit are wireless communication units formed using Bluetooth technology. The cordless telephone according to any one of claims 1 to 8, wherein the first notification unit stops the notification when charging of the battery is started.

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