JP3275498B2 - Cordless telephone with external battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone having an external battery connectable to a public wireless telephone base station and a home wireless telephone base station by wireless communication.

[0002]

2. Description of the Related Art In recent years, cordless telephones have come to be widely used together with their convenience and economy. FIG. 4A is an external perspective view of a main unit of a cordless telephone in a conventional example, and FIG. 4B is an external perspective view of a first main unit of a cordless telephone in a conventional example. In general, public wireless telephone base stations (hereinafter
A slave unit that can be connected to the home base unit 3 (hereinafter, referred to as a first base unit 3) by wireless communication with the home base unit 3 (hereinafter, referred to as a first base unit 3) includes the first base unit 3, the second base unit. A master device selection switch 18 for selecting a device is provided, and the user operates according to the situation of the place of use and the communication distance. To make a call by connecting to the first parent device main unit 3, which has low cost such as call charges, and to be able to connect to the first parent device main unit 3 by wireless communication at a location distant from the first parent device main unit 3. For use in places that are considered difficult or difficult, the user connects to the second base unit installed in the nearest public place to make a call. In addition, such a slave unit is generally equipped with a small and lightweight battery for improving the formability, and when charging the battery, the charging terminal 23 inserted into the mounting and holding unit 34 comes into contact. Charge by doing.

[0003]

However, in the above-described cordless telephone according to the conventional example, if the user tries to communicate again after taking the child device home after using the second parent device, the parent device is not used at the previous use. Since the unit selection means is the second master unit, if the master unit selection means has not been returned to the first master unit, it is unnecessarily connected to the nearby second master unit, and the line having an expensive call charge is connected. In any case, it is difficult to manage such a troublesome operation without fail in daily life. In order to secure weight, it is a small housing structure.When used in a home, it is far from the handset shape, it is ergonomically inconvenient to use, and the battery used is small and lightweight. Since it is equipped, the battery Use time there has been a problem such as that it must be frequently charged for short.

[0004] The present invention takes into account the problems of the conventional example, and is preferentially connected to a low-cost side such as a home base unit,
It is an object of the present invention to provide a cordless telephone having a configuration capable of effectively charging a battery.

[0005]

SUMMARY OF THE INVENTION To achieve this object, the present invention relates to a portable portable device which can be connected by a wireless communication path by means for selecting a first main unit at home and a second main unit outdoors. A slave unit, a first power source of the slave unit and a charging unit, a unit for detecting that an external battery device is connected, a unit for switching a first microphone to a second microphone in the external battery device, The external battery device includes a means for charging the first battery having the second battery, a fitting means for ensuring the fitting with the slave unit, and a charging means from the first master unit.

[0006]

According to the present invention, the selection switching means can be switched to the first switching mode by placing the slave unit on the charging external power supply placed on the first master unit in the home and starting charging. Control to select one master unit, control to switch to the transmitter in the external power supply, automatically switch to the external battery, and charge the internal battery of the slave unit as necessary. Will have.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. In all the drawings, the same reference numerals represent the same or corresponding members.

FIG. 1 is an external perspective view of a cordless telephone according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a handset main body, 2 denotes an external battery main body, 3 denotes a first base unit main body, and a connection between the main body of the cordless telephone and the external battery main body in one embodiment of the present invention shown in FIG. As shown in the external perspective view of the part, the fitting part between the slave unit main body 1 and the external battery main body 2 has a structure for facilitating the fitting by applying a metal plate to the fixing magnet 29 and the magnetic detection circuit 16. ing. The handset main unit 1 includes a transceiver 11, a control unit 12, a power supply control circuit 13, a transmitter switching circuit 14, a first transmitter 15, a magnetic detection circuit 16,
Battery 17, DC blocking capacitor 26, transmitter connection terminal 2
1 and FIG. 2 and those having the same names and functions as those of the conventional example shown in FIG. FIG. 3 is a block diagram showing a circuit configuration of a cordless telephone according to an embodiment of the present invention. A large-capacity second battery 21, a charging circuit 22, a second transmitter 25,
A backflow prevention diode 27;
Is provided with a base unit antenna 31, a base unit transceiver 32, and a DC power supply circuit 36, and is connected to an AC power supply 35 and a telephone line 33.

In the above-described configuration, the child device main body 1 is operated by operating the parent device selection switch 18 so that the child device main body 1 is installed in a home or the like.
The parent device main body 3 can be selected and connected for use, and a similar device can be used for selecting and connecting a second parent device (not shown) installed outdoors or the like. Next, when the external battery body 2 is placed on the first base unit main body 3, the second battery 2
The first battery 21 is charged with DC power required for charging by the DC power supply circuit 36 from the AC power supply 35 via the charging circuit 22.

When the portable unit main body 1 is further placed on the external battery main body 2 in the charging state, the magnetism detecting circuit 16 detects the fixing magnet 26 to detect that the external battery main body 2 is connected. Then, the power supply control circuit 13 switches to the second battery 21 and controls the first battery 17 to charge if the remaining capacity of the first battery 17 is low.

Further, a DC signal is supplied from the charging terminal 23 through the transmitter connection terminal 24 to the control unit 12 and is controlled so as to be in a standby state. Further, the transmitter control circuit 14 is controlled to switch to the second transmitter 25 side. Therefore, when the main unit 3 is detached from the main unit 3 while the main unit 1 and the external battery unit 2 are combined, no DC signal is supplied to the control unit 12 via the transmitter connection terminal 24, and the standby state is released. Communication is enabled by the operation key 19,
In addition, since the second battery 21 is used, a longer-time call can be made.

As described above, the cordless telephone according to the present embodiment, which can handle a plurality of base units, selects the second base unit to make a call outdoors and at a place sufficiently distant from the first base unit 3, and makes a call at home. Can be used to make a call using the first base unit 3, and when placed on the first base unit 3, the second battery 21 and the first battery 17 are charged,
Since the first main unit 3 is automatically selected, the user is preferentially connected to the first main unit 3 indoors without operating the main unit selection switch 18 for each call.

[0013]

As is apparent from the above description, according to the present invention, the cordless telephone handset can effectively use an external battery even when going out of the office, and can be used for a long time or for charging the first battery of the handset main unit. It can be easily taken out of the home and recharged to the home from home, so that the home base unit connected to the line with low call volume can be used preferentially, and calls can be made. Occasionally, the user is free from the hassle of always worrying about switching the selection of the base unit, and there is no erroneous operation that is unconsciously connected to a public base unit such as the second base unit, which has a high call volume, and furthermore, the transmitter can be used. There is an advantage that a handset configuration that is ergonomically convenient can be obtained by automatically switching.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is an external perspective view of a joint between a slave unit main body and an external battery main unit of the cordless telephone according to one embodiment of the present invention.

FIG. 3 is a block diagram showing a circuit configuration of a cordless telephone according to an embodiment of the present invention.

FIG. 4 is an external perspective view of a cordless telephone in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Handset main body 2 External battery main body 3 Home wireless telephone main unit (first main unit main unit) 7 Antenna 8 Receiver 9 Display 11 Transceiver 12 Control unit 13 Power supply control circuit 14 Transmitter switch circuit 15 First transmitter Reference Signs List 16 Magnetic detection circuit 17 First battery 18 Base unit selection switch 19 Operation key 21 Second battery 22 Charging circuit 23 Charging terminal 24 Transmitter connection terminal 25 Second transmitter 26 DC blocking capacitor 27 Backflow prevention diode 28 Bayer controller 29 Fixing magnet 31 Base unit antenna 32 Base unit transceiver 33 Telephone line 34 Mounting / holding unit 35 AC power supply 36 DC power supply circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04M 1/725 H04M 1/00 H02J 7/00 H04B 7/26

Claims (3)

(57) [Claims] 1. A first power supply which can be connected to a first parent device at home and a second parent device outdoors by wireless communication means and operates.
A slave unit, and an external power supply device having a second power supply built in and detachable from the slave unit, wherein the first master unit has a power source for charging and a transceiver for talking with the slave unit. The external power supply device comprises: a second charging means for receiving power from the first master unit and charging the second power source; and a second transmitter connectable to the slave unit. A detecting unit for detecting that the slave unit is connected to the external power supply unit; a first transmitter; and a selection switch for selecting the first master unit and the second master unit.
Means, and a microphone switching means for switching between a first microphone and a second microphone
And control means , wherein the control means switches to the second transmitter by the transmitter switching means when the detecting means determines that the slave unit is connected to the external power supply device, When a slave unit is connected to an external power supply device and the external power supply device is mounted on the first master unit, the second power source is charged from the power source of the first master unit via the second charging unit. A cordless telephone characterized in that: 2. A first power supply which can be connected to a first main unit at home and a second main unit outdoors by wireless communication means and operates.
A slave unit, and an external power supply device having a second power supply built in and detachable from the slave unit, wherein the first master unit has a power source for charging and a transceiver for talking with the slave unit. A second charging means for receiving power from the first master unit and charging the second power source; and for determining that charging is in progress and sending it to the slave unit. And a second transmitter that can be connected to the slave unit. The slave unit includes a detection unit that detects that the slave unit is connected to the external power supply device; A handset, a base unit selection for selecting the first base unit and the second base unit
Switch and a transmitter switching means for switching between the first transmitter and the second transmitter
And control means , wherein the control means controls selection switching means to select the first master unit based on a result detected by the charge detection signal sending means, and controls the external device by the detection means. A cordless telephone, characterized in that when it is determined that a handset is connected to a power supply device, the handset switching means switches to the second handset. 3. The method according to claim 1, wherein the remaining power of the first power supply is determined for the slave unit, and if the first power supply is discharging, the second power supply is discharged.
The cordless telephone having an external battery according to claim 1, further comprising a power supply control unit that starts charging from the power supply to the first power supply.