JPH0320944B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a telephone with so-called auxiliary functions, in which an auxiliary function circuit such as an answering machine or a speaker horn is provided on the main body of the telephone.

Conventional configuration and problems There are generally known telephones with additional functions, but all of these types of telephones have a telephone main body 1, a communication circuit 2, and a dial switch, as shown in FIG.
All circuits such as Di, attached functional circuit 3, incoming call detection display circuit 4, etc. are housed, and the attached functional circuit 3 is switched and connected to the telephone line by a separately provided mechanical switch S, box switch Fs, etc. There is.

However, in this type of device, all the circuits except for the transmitter 6 and receiver 7 housed in the handset 5 are built into the telephone main body 1, and the attached functional circuit 3 is connected by a mechanical switch S provided separately. Since the telephone is configured so that whether or not it is connected to a telephone line can be manually switched, the overall structure and appearance of the telephone main body 1 become extremely complicated, and there are problems in that the telephone main body 1 becomes large in size.

In Fig. 1, Ds is the dial switch Di.
This is a dial-shut switch that turns on while the switch repeats on and off operations.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks of the prior art, and improves overall operability by housing the calling circuit, dialing circuit, auxiliary function circuit, etc. in the handset and telephone body, respectively. The purpose of this invention is to provide an excellent telephone that has good performance and can be miniaturized.

Structure of the Invention The present invention houses a telephone call circuit, a dial circuit, a control voltage generation circuit, etc. in a handset, and operates a switch provided in the handset to generate a predetermined control voltage from the control voltage generation circuit. The control voltage from the voltage generating circuit is used to turn on and off an auxiliary functional circuit provided on the telephone main body.

DESCRIPTION OF EMBODIMENTS FIG. 2 is a schematic configuration diagram of an embodiment of a telephone according to the present invention. In the figure, 11 is a telephone main body, 12
is an incoming call detection display circuit connected to the telephone line, 13
14 is a full-wave rectifier circuit consisting of four diodes D ₁ , D ₂ , D ₃ , and D ₄ for full-wave rectifying the DC voltage applied to the telephone line; a voltage discrimination circuit that controls on/off an attached functional circuit 15 such as a speaker horn;
16 is a handset connected to the telephone body 11 via a cord 17; 18 is a communication circuit housed within the handset 16; 19 is a dial circuit;
0 is a switch Fs or a separate switch S
A control voltage generating circuit 21 and 22 are a transmitter and a receiver connected to the communication circuit 18, respectively.

In the above embodiment, when both the switch Fs and the switch S are off, no output appears from the control voltage generation circuit 20, and therefore the dial circuit 19 becomes inoperable in this state. , the voltage discrimination circuit 14 does not operate at all. Now, if the switch Fs is turned on, a predetermined constant voltage is output from the control voltage generating circuit 20, and the dial circuit 19 becomes operable. The voltage discrimination circuit 14 may be configured to operate simultaneously in this state, and the attached functional circuit 15 may be in an operating state, but in this embodiment, the voltage discrimination circuit 14 still does not operate at the above-mentioned constant voltage. The auxiliary functional circuit 15 is still inactive.

When switch S is turned on, control voltage generation circuit 2
Another predetermined constant voltage is output from 0,
The voltage discrimination circuit 14 is activated by the constant voltage, and the auxiliary functional circuit 15 is brought into operation. Therefore, if an answering machine uses a speaker horn or the like as the attached functional circuit 15, for example, these devices and the horn become operational by turning on the switch S.

FIG. 3 is an electrical wiring diagram of specific main parts of another embodiment, and in the figure, TR ₁ , TR ₂ , R ₁ to R ₄ , D ₅ ,
_D6 is a transistor, resistor, and diode that constitute the control voltage generation circuit, Fs is a foot switch, S is a switch, Di is a dial switch,
Ds is the call circuit 1 while the dial switch Di is operating.
Dial shunt switch that shuns 8,
TR ₃ to _{TR 7} , R ₅ to R ₁₂ , and 23 are transistors, resistors, and NAND circuits that constitute voltage discrimination circuits, 24 is a speaker horn circuit as an auxiliary functional circuit, and 25 is controlled by the output of the NOR circuit 23. 26 is a speaker which also serves as a microphone.

In the embodiment shown in FIG.
When Fs is turned on, transistor TR ₁ is turned on, and transistor TR ₂ is connected to the communication circuit 18, and the switch is turned on.
A predetermined voltage is applied via Fs, and the communication circuit 1
8 becomes operational. And in this state the resistance
The potential at the connection point of R ₄ and diode D ₅ is in a relatively low state and therefore the transistor
Both TR ₃ and TR ₅ are in the off state. Therefore,
Both inputs of the NAND circuit 23 are at high level,
Bidirectional switch circuit 25 is in an off state. In addition, in this state, the transistor TR ₅ is off and its collector potential is at a high level, so the transistors TR ₄ and TR ₆ are off, the transistor TR ₇ is off, and the speaker horn circuit 24 is also off. is in a state of

Next, the case where the switch S is turned on will be explained. When switch S is turned on, the switch
The transistor turns on just like when Fs is turned on.
TR ₁ and TR ₂ are turned on, but in this case, the switch Fs is turned off, and the communication circuit 18 remains turned off. In this case, the potential at the connection point between resistor R ₄ and diode D ₅ becomes relatively high, and both transistors TR ₃ and TR ₅ are turned on. Therefore, both inputs of the NAND circuit 23 become low level, a high level signal is applied to the bidirectional switch circuit 25, and the bidirectional switch circuit 25 is turned on. At the same time, transistor TR ₄ turns on, and transistors TR ₆ ,
TR ₇ is turned on, a predetermined voltage is applied to the speaker horn circuit 24 through the transistor TR ₇ , and the speaker horn circuit 24 becomes operational.

In this way, according to the above embodiment, when the switch Fs is turned on, and when the separately provided switch S is turned on,
When the phone is turned on, the telephone call circuit 18 provided in the handset 16 and the speaker horn circuit 24 provided in the telephone body 11 can be switched and used separately, and by the above-mentioned switches Fs and S provided on the handset 16 side. , has the advantage of being easy to operate.

In addition, in the above embodiment, the dial switch
When Di is turned on or off, the transistor TR ₁ ,
TR ₂ turns on and off at the same time, and this transistor TR ₁ ,
Noise is input due to the on/off of TR ₂ , but these are due to the connection position of dial shunt switch Ds,
This problem can be easily resolved by partially changing other circuit connections.

Effects of the Invention As is clear from the above two embodiments, the present invention provides a communication circuit and a control voltage generation circuit on the handset side, and the on/off operation of the switch provided on the handset side makes the circuit different from the control voltage generation circuit. In addition to outputting a predetermined control voltage, a circuit for discriminating the control voltage is provided on the telephone main body side, and an attached function circuit provided on the telephone main body side is controlled to turn on or off based on the output of this circuit. The telephone communication circuit and accessory function circuit are provided separately on the handset side and the telephone main body side, respectively, and the switch and switch are both provided on the handset side, so the structure of the telephone main body is relatively simple. It has the advantage of being simple. Further, by providing the switch on the handset side, there is no need for space for it on the telephone main body side, which has the advantage that the telephone main body can be downsized as a whole and operability can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional telephone; FIG. 2 is a schematic diagram of an embodiment of the telephone of the present invention;
FIG. 3 is a specific electrical wiring diagram of the main parts of another embodiment. 11... Telephone main body, 12... Incoming call detection display circuit, 13... Rectifier circuit, 14... Voltage discrimination circuit,
15...attached functional circuit, 16...handset,
17... Code, 18... Call circuit, 19... Dial circuit, 20... Control voltage generation circuit, 21...
...Telephone transmitter, 22...Telephone receiver, 23...NAND circuit, 24...Speaker horn circuit, 25...Two-way switch circuit, 26...Speaker.

Claims (1)

[Claims] 1 Dial circuit, call circuit,
A control voltage generation circuit is provided, and a switch provided on the handset side outputs a different predetermined control voltage from the control voltage generation circuit. 1. A telephone characterized by being equipped with a voltage discrimination circuit for controlling the on/off of attached function circuits such as an answering machine and a speakerphone.