JPH0752853B2 - Wireless phone - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless telephone including a base unit having a built-in storage battery and a portable handset.

2. Description of the Related Art Conventionally, there is a wireless telephone of this type shown in FIG. FIG. 2a is a diagram showing the configuration of the base unit. In FIG. 2, 1 is a terminal for connecting to a telephone line, 2 is a transmitting / receiving circuit, 3 is an antenna, and a voice signal from the telephone line connecting terminal 1 is a transmitting / receiving circuit. It is converted into a radio frequency signal at 2 and transmitted to the slave unit via the antenna 3. Further, the radio frequency signal from the handset is sent to the telephone line by the route reverse to the above. A microcomputer 4 controls the transmitting / receiving circuit 2 and the bell 8. A bell signal detection circuit 5 detects a bell ringing signal among the signals sent from the connection terminal 1 for connecting to the telephone line and sends the detection signal to the microcomputer 4. 6 is a charging circuit, and 7 is a charging terminal. When the slave unit is installed in the master unit, the charging circuit 6 charges the storage battery of the slave unit via the charging terminal 7.

FIG. 2b is a diagram showing the configuration of the slave unit. In FIG. 2b, reference numerals 2, 3, 4, and 7 are the same as those in FIG. 9 is a storage battery,
Supply power to each circuit of the child device. 10 is a switch circuit,
When the key switch 11 is operated, the switch circuit 10 is conducted via the microcomputer 4 and the power from the storage battery 9 is supplied to each circuit in the slave unit. Reference numeral 12 is a speaker, and the radio frequency signal transmitted from the base unit is the antenna 3 and the transmission / reception circuit 2
And is converted into an audible signal by the speaker 3. A microphone 13 converts a voice signal into an electric signal and sends a radio frequency signal to the master unit via the transmission / reception circuit 2 and the antenna 3.

The conventional wireless telephone is configured as described above.

Problems to be Solved by the Invention By the way, in the above-mentioned conventional wireless telephone, when an incoming call is received from a telephone line in a state where a child device is installed in a parent device and charging is performed, After listening to the bell sound of the master unit, it was necessary to take the slave unit out of the master unit and operate the key switch 11 of the slave unit to power on the slave unit. In addition, when the radio channel used is multi-channel, it takes time to link the channel between the master unit and the slave unit, so there is a drawback that it takes more time until conversation is possible after listening to the bell sound. It was

Means for Solving Problems The technical means for solving the above problems is to provide first control means for sending an incoming signal from the first charging terminal when the base unit receives an incoming call from a telephone line. On the other hand, the slave unit is provided with an incoming signal detecting means for detecting the incoming signal inputted through the second charging terminal, and the output from the incoming signal detecting means supplies power from the storage battery to the transmitting / receiving circuit of the slave unit. The second control means for controlling the supply is provided.

With the above configuration, the wireless telephone according to the present invention, when the slave unit is installed in the master unit, when an incoming call is received from the telephone line,
The transmitter / receiver circuit of the handset is automatically placed in a call-enabled state to improve operability.

EXAMPLE An example of the present invention shown in FIG. 1 will be described below. FIG. 1a is a diagram showing a master unit, and although 1 to 8 are the same as FIG. 2, the charging circuit 6 is controlled by a microcomputer 4 so that the interruption of charging current is controlled. FIG. 1b is a diagram showing a slave unit, and 2 to 4, 7, 9 to 13 are the same as FIG. Reference numeral 14 is a charging current detection circuit which is inserted between the charging terminal 7 and the storage battery 9 to detect the intermittent state of the charging current and sends a detection signal to the microcomputer 4. Next, the operation will be described.

When the slave unit is installed in the master unit, the charging circuit 6 of the master unit charges the storage battery 9 of the slave unit. When an incoming call is received from the telephone line, the incoming call signal detected by the bell signal detection circuit 5 is sent to the microcomputer 4. The microcomputer 4 operates the bell 8 and simultaneously interrupts the charging current of the charging circuit 6 in a predetermined pattern. on the other hand,
The charging current detection circuit 14 on the slave side detects the intermittent status of the charging current and sends it to the microcomputer 4. The microcomputer 4 reads a predetermined pattern from the signal of the charging current detection circuit 14, recognizes that it is in the incoming state, makes the switch circuit 10 conductive, and supplies power to the transmission / reception circuit of the slave unit. Further, in the case of the multi-channel access method in which the channels between the master unit and the slave units are plural, it is possible to ring the bell after establishing the call channel in advance. Therefore, it is possible to significantly reduce the time from when the handset is picked up after picking up the bell sound to when the call becomes available.

EFFECTS OF THE INVENTION As described above, the wireless telephone of the present invention can automatically turn on the power supply of the transmission / reception circuit of the handset when an incoming call is received from the telephone line. There is an advantage that a switch operation is not necessary, and even when a multi-channel access method is adopted, the time until conversation becomes possible can be shortened and the operability becomes extremely good.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a wireless telephone according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of a conventional wireless telephone. 1 ... Terminal for connection to telephone line, 2 ... Transmission / reception circuit, 3 ...
... antenna, 4 ... microcomputer, 5 ... bell signal detection circuit, 6 ... charging circuit, 7 ... charging terminal, 8 ...
... Bell, 9 ... Battery, 10 ... Switch circuit, 11 ... Key switch, 12 ... Speaker, 13 ... Microphone, 14 ... Charging current detection circuit.

Claims (2)

[Claims] 1. A first unit provided on the master unit, comprising a master unit connected to a telephone line and a portable slave unit using a storage battery as a power source, the slave unit being installed on the master unit. In a wireless telephone for charging the storage battery in the slave unit from a charging circuit provided in the master unit by bringing the charging terminal of the slave unit into contact with a second charging terminal provided in the slave unit. A first control means is provided for transmitting an incoming signal from the first charging terminal when an incoming call is received from a line, and the slave unit detects the incoming signal input through the second charging terminal. A radio telephone comprising: an incoming signal detecting means for controlling the incoming signal detecting means; and a second control means for controlling the output from the incoming battery to supply power to the transmitting / receiving circuit of the slave unit. 2. When the base unit receives an incoming call from a telephone line, a first control means is provided for controlling the charging current of the charging circuit to be intermittent for a predetermined period to send an incoming signal to the first charging terminal.
On the other hand, a charging current detecting means is provided between the second charging terminal of the slave and the storage battery, and the output from the charging current detecting means is controlled to supply power from the storage battery to the transceiver circuit of the slave. The radiotelephone set forth in claim 1, further comprising two control means.