JPH10173748A - Cordless telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cordless telephone set in which no electrostatic discharge is caused, even when a hand of a person in a charged state or the like approaches a charging terminal, when a mobile station is removed from a base station and the charging terminal of the base station is exposed externally. SOLUTION: When a mobile station 20 is hooked on, a force is exerted to a pressure sensor 10 in the inside of a base station 1, a relay 9 is operated by its sensing signal, resulting in that a charging current is supplied through a path of a power supply circuit 7, a relay 9, a charging terminal 8a, a charging terminal 26a, a built-in battery, a charging terminal 26b, and a charging terminal 8b in this order. When the mobile station 20 is hooked off, no force is exerted to the pressure sensor 10 in the inside of the base station 1, and since the relay 9 is not operated based on the sensing signal, the charging terminals 8a, 8b are disconnected from the internal circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone apparatus comprising a base station connected to a telephone line and a mobile station wirelessly connected to the base station. The present invention relates to a cordless telephone device provided in a station.

[0002]

2. Description of the Related Art In a cordless telephone having a function of charging a built-in battery of a mobile station in a base station, a terminal for supplying a charging current is prepared in the base station.

FIG. 3 is a schematic explanatory view of a conventional cordless telephone device. In the figure, reference numeral 20 denotes a mobile station (so-called slave unit, which is detachably attached to the master unit as is well known), 26a and 26b are charging terminals, and 28 is an antenna. 40 is a base station (so-called master unit), 7 is a power supply circuit (see FIG. 4), 8a and 8b are charging terminals, and 11 is an antenna. When the mobile station 20 is installed on the charging stand of the base station 40, the charging terminals 26a and 8a and the charging terminals 26b and 8b come into contact, and the power supply circuit 7 of the base station 40 and the internal battery of the mobile station 20 (described in FIG. ) Is closed and the internal battery is charged.

FIG. 4 is a block diagram showing the configuration of a conventional cordless telephone device. FIG. 3 with reference to FIG.
Will be described more specifically. The base station 40 sends a call from the telephone line 6 to the wireless transmission circuit 3 via the communication circuit 5, and transmits a radio frequency modulated radio wave from the antenna 11. Further, the radio wave transmitted from the antenna 28 of the mobile station 20 is received by the antenna 11 and sent to the radio receiving circuit 2, and the demodulated call is sent out to the telephone line 6 via the call circuit 5. These series of operations are performed under the control of the CPU 4.

[0005] The mobile station 20 is connected to the antenna 11 of the base station 40.
The radio wave transmitted from the antenna is received by the antenna and sent to the radio receiving circuit, and the demodulated call is radiated from the speaker 31 via the call circuit. In addition, a call from the microphone 30 is sent to the wireless transmission circuit 24 via the communication circuit 22, and a high-frequency modulated radio wave is transmitted from the antenna 28.
These series of operations are performed under the control of the CPU 25. E denotes a built-in battery, which is a power source for the communication circuit 22, the radio reception circuit 23, the radio transmission circuit 24, and the like.

When the mobile station 20 is installed on the charging stand of the base station 40, the internal battery E is supplied from the power supply circuit 7 of the base station 40 → the resistor R → the charging terminal 8a → the charging terminal 26a of the mobile station 20 → the charging state detecting circuit. The internal battery E is charged through a charging path of 21 → internal battery E → charging terminal 26b → charging terminal 8b → earth.

[0007]

However, in the conventional cordless telephone device, the charging terminals 8a,
Since b is directly connected to the internal circuit, static electricity is easily discharged when a charged object approaches. Therefore, the mobile station 20
Is removed from the charging stand of the base station 40, and when the charging terminals 8a, 8b of the base station 40 are exposed, when a charged person's hand or the like approaches the charging terminals 8a, 8b, static electricity is discharged, and the person is discomforted. Or cause malfunction of the device.

The present invention has been made in view of such a point, and when a mobile station is detached from a base station and a charging terminal of the base station is exposed, a charged person's hand or the like may charge the charging terminal. An object of the present invention is to provide a cordless telephone device in which electrostatic discharge does not occur even when approaching a terminal.

[0009]

SUMMARY OF THE INVENTION The presence / absence of a mobile station in a charging stand of a base station can be detected by hook detection means provided in the base station and detecting on / off hook of the mobile station. Also, the switching means provided in the base station can turn on / off the connection between the charging terminal of the base station and the power supply circuit. That is, when the mobile station goes on-hook, a force is applied to the pressure sensor of the hook detecting means, and the on-hook information is transmitted to
Tell the PU. As a result, the CPU turns on the relay of the switching means, and a charging path is formed. Conversely, when the mobile station goes off-hook, the CPU turns off the relay based on information from the pressure sensor.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A cordless telephone according to the present invention has a function of charging a built-in battery of a mobile station in a base station.
In a cordless telephone device in which charging terminals are provided mutually and a mobile station is detachably attached to a base station, hook detecting means for detecting that the mobile station 20 has hooked on / off to the base station 1, and a base station Switching means for turning on / off between charging terminals 8a and 8b provided on the base station 1 side and a power supply circuit 7 provided on the base station 1 side, and charging the base station 1 when the mobile station 20 is off-hook. Terminals 8a, b
The power supply circuit 7 is separated from the power supply circuit 7 by a switching means. When the mobile station 20 is hooked on, it is detected by a hook detecting means, and the charging terminals 8a and 8b provided on the base station 1 side are connected to each other. It is characterized in that it is connected to the power supply circuit 7.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 3 and 4 denote the same elements, and a description thereof will be omitted. FIG. 1 is a schematic explanatory view of one embodiment of the cordless telephone device of the present invention. In the figure, 1 is a base station, 9
Is a relay as switching means for turning on / off between the charging terminals 8a, b and the power supply circuit 7, and 10 is a base station 1 connected to the mobile station 2
0 is a pressure sensor as hook detection means for detecting on / off hook. In this case, the charging terminals 8a and 8b are exposed and mounted on the housing of the base station 1. The positional relationship between the charging terminals 8a and 8b and the pressure sensor 10 is, for example, as shown in FIG. When the pressing force is applied to the charging terminals 8a and 8b, the pressing force is transmitted to the pressure sensor 10 and the detection signal is transmitted. The position at which the pressure sensor 10 is provided is not necessarily limited to the lower surface of the charging terminals 8a and 8b. When the pressure sensor 10 is set in the base station 1 to charge the mobile station 20, the pressure sensor 10 may come into contact with a part of the mobile station 20.
It may be a pressed position. FIG. 2 shows an outline of one example. When the mobile station 20 is hooked on the base station 1, a force is applied to the pressure sensor 10 provided on the base station 1 side, and the relay 9 is operated based on the detection signal, and the power supply circuit 7 → relay. 9 → charging terminal 8a → charging terminal 2
6a and the charging current will flow.

FIG. 2 is a block diagram schematically showing an embodiment of the cordless telephone apparatus according to the present invention. FIG.
1 will be described more specifically with reference to FIG. When the mobile station 20 is on-hook, a force is applied to the pressure sensor 10 to transmit on-hook information to the CPU 4. Thereby, the CPU 4 turns on the relay 9, and the power supply circuit 7 → the resistor R → the relay 9 → the charging terminal 8a → the charging terminal 26a → the charging state detecting circuit 21 → the internal battery E → the charging terminal 26b → the charging terminal 8b → the relay 9 → An earth charging path is formed, and the internal battery E of the mobile station 20 can be charged.

Conversely, when the mobile station 20 is off-hook, the CPU 4 turns off the relay 9 based on the information from the pressure sensor 10, and the charging terminals 8a and 8b of the base station 1 are disconnected from other internal circuits. Thereby, even if the charged substance approaches the charging terminals 8a and 8b exposed on the surface after the mobile station 20 is removed, the discharge can be prevented by the withstand voltage between the contacts of the relay 9. In the figure, the pressure sensor 10 is used to detect the on / off hook,
Although an example in which the relay 9 is used to turn on / off the charging path has been described, a hook switch or a flat switch is used to detect an on / off hook, and a mechanical switch such as a hook switch or a photocoupler is used to turn on / off the charging path. It is also possible to use

[0014]

As described above, the cordless telephone device according to the present invention comprises a hook detecting means for detecting that the mobile station 20 has hooked on / off to the base station 1, and a charging terminal provided on the base station 1 side. Switching means for turning on / off between the power supply circuits 7a and 8b and the power supply circuit 7 provided on the base station 1 side, and when the mobile station 20 is off-hook, the charging terminals 8a and b of the base station 1 and the power supply circuit 7 are separated from each other via the switching means, and when the mobile station 20 is on-hook, it is detected via the hook detecting means, and the base station 1 is detected.
The charging terminals 8a and 8b provided on the side of the mobile station are connected to the power supply circuit 7, so that even when a person or the like charged in the off-hook state of the mobile station approaches the charging terminal of the base station. Electrostatic discharge can be prevented by the dielectric strength between the contacts of the relay, and discomfort to the person due to the electrostatic discharge and malfunction of the device can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of one embodiment of a cordless telephone device of the present invention.

FIG. 2 is a configuration block diagram schematically showing an embodiment of a cordless telephone device according to the present invention.

FIG. 3 is a schematic explanatory view of a conventional cordless telephone device.

FIG. 4 is a configuration block diagram schematically showing a conventional cordless telephone device.

[Explanation of symbols]

 Reference Signs List 1 base station 2 wireless receiving circuit 3 wireless transmitting circuit 4 CPU 5 communication circuit 6 telephone circuit 7 power supply circuit 8a, b charging terminal 9 relay 10 pressure sensor 11 antenna R resistance 20 mobile station 21 charging state detection circuit 22 communication circuit 23 wireless Receiving circuit 24 Wireless transmitting circuit 25 CPU 26a, b Charging terminal 28 Antenna 29 Relay 30 Microphone 31 Speaker E Built-in battery 40 Base station

Claims (1)

[Claims] 1. A cordless telephone device in which a base station has a function of charging a built-in battery of a mobile station, charging terminals are provided mutually, and the mobile station is configured to be detachable from the base station. (1) hook detection means for detecting that the mobile station (20) has turned on / off hook; charging terminals (8a, b) provided on the base station (1) side; and a charging terminal (8) provided on the base station (1) side. Switching means for turning on / off the power supply circuit (7), and when the mobile station (20) is off-hook, the charging terminals (8a, b) of the base station (1) and the power supply circuit (7) And the mobile station (20)
Is detected via hook detection means when the terminal is on-hook, and charging terminals (8a, 8a,
(b) a power supply circuit (7) is connected to the cordless telephone device.