JPS6028334A - Telephone set - Google Patents

Abstract

PURPOSE:To continue talking without retention of a radio transceiver even if the user disconnects from a telephone set main body by changing over the talking from the wire talking to the radio talking by means of the radio transceiver when the telephone set main body detects that a cord connecting the radio transceiver to the main body is disconnected. CONSTITUTION:When the user has to leave the telephone set main body 1 to study materials or the like and desires to continue talking during the talking, it can be performed by disconnecting the cord 3 from the handset 2. That is, in disconnecting the cord 3 from the handset 2, a relay A of the main body 1 and a relay B of the handset 2 are both restored, and contacts a, b of the respective relays are changed over to the position in solid lines in the figure. Thus, transmitter terminals T1, T2 and receiver terminals R1, R2 of a telephone set circuit 11 of the main body 1 are led respectively to a radio transceiver circuit 12 of the main body side via transformers TR1, TR2 respectively, while a transmitter T and a receiver R of the transceiver 2 are led to a radio transceiver circuit 22 of the handset side.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a telephone. In conventional telephones, the telephone main body and the handset are always connected by a cord. For this reason, depending on the content of the call, if you want to leave the phone to look up materials, etc., you often have to temporarily put the handset on hold and leave the phone.

SUMMARY OF THE INVENTION An object of the present invention is to provide a complete telephone capable of continuing a call without temporarily putting the handset on hold, even when the telephone is separated from the main body, except for the above-mentioned drawbacks.

The telephone of the present invention includes a telephone main body and a handset.

a cord connecting the telephone body and the handset; a handset, and means for detecting disconnection of the cord and switching from a wired conversation with a friend to a wireless conversation using the first wireless handset; An embodiment of the telephone set according to the present invention will be described with reference to the drawings, which is characterized in that it includes means for switching from a wired telephone call to a wireless telephone call using the second wireless handset when detected.

FIG. 1 is a block diagram of one embodiment of a telephone according to the present invention. The telephone circuit 11 provided in the telephone body 1 is similar to the conventional telephone circuit, and includes a ring detection circuit 111 that detects the ring tone from the 92 line, a hook switch FS, and a dial circuit section 11 that generates all dial signals. It consists of telephone circuitry 113 that directs signals to the handset and signals from the handset to the line.

When a ring tone is input from the exchange to the central terminals Ll and L2 on the telephone body 1, the signal is passed through the hook switch FS,
When the ringing detection circuit 111 is activated, a ringing tone is produced by a bell or a tone ringer. When the caller hears the ringer and raises the handset, the hook switch FS will be in the dotted line state.
Enter the call state. Under normal call conditions, the cord 3 connects the telephone body 1 and the handset 2, so the cord 3 connects the telephone body 1 and the handset 2.
IJL/-A and transmitter 2 relay B are operating together, and the contacts a and bH1 of each relay are operating as indicated by dotted lines in the diagram. Therefore, the transmitter T and receiver holder built into the handset 2 are connected to the receiver terminals Ti, Tz and the receiver terminal holder 1 of the telephone circuit 11 of the telephone main body l. It is directly connected to R2, allowing MFA calls to be made just like a conventional telephone.

Next, a case will be described in which, while the above-mentioned telephone conversation is continuing, the user disconnects from the telephone main body 1 in order to investigate materials, etc., and wants to connect the telephone conversation. In such a case, the cord can be pulled out from the 3-denominated transmitter/receiver 2. That is, code 3
When it is pulled out from the handset 2, both the relay A of the main body 1 and the relay B of the handset 2 are restored, and the contacts a and b of each relay become connected as indicated by the solid lines in the figure.

Therefore, in this state, the telephone circuit 1 of the main body l
1 transmitter terminal 'r1. T2 and handset terminal 1, R
2 are led to the wireless transmitting/receiving circuit 12 on the main body side of 1 through transformers T1 and T2, respectively, and -10,000.

The transmitter T and the receiver R of the handset 2 are guided to a wireless transmitter/receiver circuit 22 on the handset side. Further, although the battery is normally charged from the power supply, after the cord 3 is pulled out, the necessary power is supplied to the wireless transmitting/receiving circuit 22 on the handset/receiver side. Diode D is for preventing current from flowing backwards from the battery to the power source. In this state, when a person speaks into the transmitter T, the signal is superimposed on a carrier wave by the transmitter 22T of the wireless transmitter/receiver circuit 22 on the handset and receiver side, and is emitted as a smear wave to the antenna person NT2. Main body 1. On the side of
The receiving section 1.2 demodulates in R, passes through transformer TR1i,
Leads to transmitter terminals TI and T2.

Conversely, the voice of the other party is transmitted through the handset terminals R1 and R2, through the transformer TI (2t), converted into radio waves at the transmitter 12T, and emitted from the antenna ANTI. , this radio wave 2AN'r2 is received, demodulated into an audio signal by the receiving section 22Bl, and guided to the receiver R. Then, when the main unit 1 and the handset 2 are fully connected again with the cord 3, the original communication state is restored. After the call ends, the hook switch FS will be restored by returning the handset 2 to its normal position on the main body 1.

According to the present invention, as described above, even if the telephone is separated from the main body by more than the length of the cord, the telephone conversation can be continued as in a normal telephone conversation.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of a telephone according to the present invention. 'l-...Telephone body, 11...-Telephone circuit, 12...Body side wireless transceiver, A and a
...Relay and its contacts, 'r1. 'rl・
...Telephone terminal, 几1. R2--Handset terminal, TR1, TR2...Transformer, ANTI,
2...Antenna, 2...Transmitter, 22
・・・・・・Transmitter side wireless transceiver, B and b...
...17) - and its contacts, T...Telephone, R...Telephone receiver, 3...Code, D
······diode.

Claims (1)

[Claims] A telephone comprising a telephone body, a handset and a cord for connecting the telephone body and the handset, wherein the cord is provided with means for completely disconnecting the telephone body and the handset, and the telephone body is connected to a broom. - a wireless handset and means for switching from a tvii call to a wireless call using the first wireless handset when disconnection of the cord is fully detected; and means for switching from a wired call to a wireless call using the second wireless handset when disconnection is detected.