JPH05276097A - Cordless telephone set - Google Patents

Abstract

PURPOSE:To prevent malfunction of quick talking on the occurrence of a power failure by detecting whether or not a power failure take place and controlling the line not to be connected in the case of the power failure upon the receipt of a line connection request from a slave set. CONSTITUTION:When a master set 1 receives a line request signal from a slave set 2, a control circuit of the master set 1 discriminates whether the mode is the quick talking mode or the usual talking mode. In the case of the quick talking mode, whether or not a power failure takes place at present is discriminated based on an output of a power failure detection circuit, a reception wait return signal is sent to the slave set 2 on the occurrence of the power failure to return the slave set 2 to the reception standby state. When not in power failure, a telephone line L is connected to accept the talking by the slave set 2. In the case of the usual talking mode, the telephone line L is always connected regardless of power failure. Thus, malfunction of quick talking due to power failure is prevented and talking is implemented by the operation of a speech key even during power failure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system comprising a master unit connected to a telephone line and a slave unit wirelessly connected to the master unit.

[0002]

2. Description of the Related Art In recent years, a cordless telephone device, which is disclosed in, for example, Japanese Utility Model Publication No. 3-770, comprises a master unit connected to a telephone line and a slave unit wirelessly connected to the master unit. These handset units are equipped with a quick call function that allows you to connect the telephone line just by lifting it from the charger. The determination as to whether the battery has been lifted by the charger is made by detecting a change in the voltage supplied from the charger.

[0003]

By the way, since the quick call of the handset is performed by the signal level applied to the charging terminal as described above, the same signal change as in the quick call occurs even when a power failure occurs. There was a drawback that the telephone line was connected.

[0004]

The cordless telephone device of the present invention detects the power failure in the master unit and detects whether or not there is a power failure when the line connection request signal from the slave unit is received. It is provided with a control means for connecting the line when there is no power failure and not connecting the line when there is a power failure.

[0005]

The cordless telephone device of the present invention is constructed as described above, and can prevent line connection in the event of a power failure.

[0006]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a cordless telephone device according to the present invention, in which (1) is a master unit connected to a telephone line (L) and is supplied with power from a commercial power source (E). (2) is a slave unit wirelessly connected to the master unit (1) and has charging terminals and master unit placement detection terminals (3) and (4). Reference numeral (5) is a charging stand having charging terminals (6) and (7) on which the slave unit (2) can be mounted. When the slave unit (2) is mounted, the detection terminals of the charging unit are connected to each other. There is.

FIG. 2 shows a block diagram of the base unit (1), (8) a receiving circuit for receiving a signal from the handset (2), and (9) transmitting a signal to the handset (2). It is a transmission circuit. (10) is a network circuit connected to the telephone line (L) and includes a connection circuit for connecting and disconnecting the telephone line (L). Reference numeral (11) is a dial circuit for sending a dial signal to the telephone line (L) through the network circuit (10), and reference numeral (12) is a power supply circuit for converting a commercial power supply (E) into a DC power supply. Supply power. (13) is a backup power supply for a power failure, and (14) is a detection circuit for detecting the voltage level of the power supply circuit (12) to detect whether or not there is a power failure. Reference numeral (15) is a control circuit including a microcomputer, which controls the entire master unit (1).

FIG. 3 shows a block diagram of the slave unit (2),
(16) is a receiving circuit for receiving a signal from the base unit (1),
(17) is a transmission circuit for transmitting a signal to the master unit (1). (18) is a speaker connected to the amplifier (18),
(19) is a microphone. (20) is a key circuit including a numeric keypad (21), a call key (22), and an off key (23), and (24) is charged from the master unit (1) via the detection terminals (3) and (4). A secondary battery supplies power to each circuit. Reference numeral (25) is a detection circuit for detecting whether or not the slave unit (2) is charged, that is, whether or not the slave unit (2) is mounted on the master unit (1). Output a signal. Reference numeral (26) is a control circuit composed of a microcomputer for controlling the entire slave unit (2).

By the way, the control circuit (2
In 6), when the detection circuit (25) detects that it has been picked up from the state of being placed on the charging stand (5), a line connection request is automatically made without operating the call key (22). A signal is transmitted (hereinafter referred to as a quick call mode). Further, when the telephone is not placed and is in a reception standby state, a line connection request signal is transmitted when the telephone call key (22) is operated (hereinafter referred to as a normal telephone call mode). However, in the present invention, in order to distinguish the line connection request signals in each of the above cases, a signal indicating the quick call mode and the normal call mode is added to each signal and transmitted.

When a line request signal is transmitted from the slave unit (2) and the master unit (1) receives the line request signal, the control circuit (15) of the master unit (1) controls the slave unit (2). Determine whether it is a quick call mode or a normal call mode. Here, in the quick call mode, it is determined based on the output of the detection circuit (14) whether or not there is a power outage at present. The machine (2) is returned to the reception standby state. Also, if there is no power outage, the telephone line (L) is connected to allow a call by the slave unit (2).

In the normal call mode, the telephone line (L) is always connected regardless of whether or not there is a power failure. This prevents the malfunction of quick calls due to power failure, and even when there is a power failure, the call key (2
A call can be made by the operation of 2). Although the charging stand (5) is separately provided in the present invention, it may be provided integrally with the parent machine (1).

[0012]

The present invention is configured as described above, and can prevent malfunction of quick call during power failure.

[Brief description of drawings]

FIG. 1 is a block diagram of a cordless telephone device of the present invention.

FIG. 2 is a block diagram of a master unit according to the present invention.

FIG. 3 is a block diagram of a child device of the present invention.

[Explanation of symbols]

 1 Master unit 2 Slave unit 3 Charging stand 14 Blackout detection circuit 15 Control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Hasegawa 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A master unit connected to a telephone line, and a rechargeable slave unit wirelessly connected to the master unit. When the slave unit detects that charging is canceled, the master unit is detected. In a cordless telephone device adapted to transmit a line connection request signal to a mobile device, whether a power failure occurs when the main unit receives a detection circuit for detecting a power failure and a line connection request signal from the slave unit. A cordless telephone device, which is provided with a control means for detecting that the line is connected when there is no power failure and for not connecting the line when there is a power failure.