JPH0314374B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a telephone with so-called additional functions, in which an automatic dialing device is provided on the handset side and additional function circuits such as an answering machine and a speaker horn are provided on the main body of the telephone. It is.

Conventional Structure and Problems Generally, telephones with additional functions are well known, but as shown in FIG. 4. All the circuits such as the incoming call detection display circuit 5 are housed, and the attached function circuit 4 is provided separately using a mechanical switch S, a switch HS, etc.
I am trying to switch the connection to the telephone line.

However, in this type of device, all circuits are built into the telephone main body 1 except for the handset 7 and the handset 8 housed in the handset 6, and furthermore, it is possible to switch whether or not to connect the attached functional circuit 4 to the telephone line. The changeover switch S is also installed within the telephone main body 1, and therefore, there is a problem in that it is relatively difficult to downsize the telephone main body 1 itself.

Purpose of the Invention The present invention eliminates the above-mentioned drawbacks of the prior art, and reduces the overall size by housing the calling circuit, dialing circuit, auxiliary function circuit, etc. in the handset and telephone body, respectively. The purpose is to provide an excellent telephone that is flexible and easy to operate.

Structure of the Invention The present invention includes a dial circuit, a call circuit, an automatic dial circuit that can be controlled by a current value detection circuit, a variable resistance switch circuit that converts the output current of a constant current circuit on the main body side into voltage, etc. on the handset side. By operating a switch provided in the handset, a variable resistance switch circuit generates a predetermined converted control voltage in a constant current output circuit on the main body side. This control voltage is used to turn on and off an auxiliary functional circuit provided on the telephone main body side. In addition, the current value detection circuit on the handset side is activated by the operation of the current value variable switch circuit of the constant current output circuit, which is controlled by the attached function circuit provided on the telephone body side, and the automatic dialing circuit starts automatic dialing. - It is configured to control termination.

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 rectifier circuit consisting of four diodes D ₁ , D ₂ , D ₃ , D ₄ that full-wave rectifies the DC voltage applied to the telephone line; 14 is a rectifier circuit that discriminates the output of a constant voltage circuit 16 to be described later; 16 is a constant current circuit that supplies a constant current to the handset 19 side; 17 is a constant current circuit 16 that uses the output of the attached function circuit 15; 19 is a handset connected to the telephone main body 11 via a cord 18;
2 is a communication circuit housed in the handset 19;
1 is the dial circuit, 22 is the hook switch HS,
A variable resistance switch circuit in which the overall resistance value is changed by a separately provided switch S and a switch DS that is continuously turned on during dialing, and 23 and 24 are a transmitter and a receiver connected to the communication circuit 20, respectively. , 25 detects the current flowing through the variable resistance switch circuit 22, uses the output to automatically dial a pre-registered telephone number in the automatic dialing circuit 26, and starts the dialing operation after a certain period of time after the dialing is completed. This is a DC value detection circuit that outputs a trigger for stopping.

In the above embodiment, when the switch HS, the switch S, and the switch _DS are all off, the resistance value of the variable resistance switch circuit 22 maintains the highest first value, and the resistance value of the constant current circuit 16 maintains the first value. The output voltage also maintains the initial setting voltage.
Therefore, in this state, the telephone main body 11 side recognizes that no operation is being performed on the handset 19 side.
When H _S is turned on, the resistance value of the variable resistance switch circuit 22 becomes a predetermined second resistance value. However, in this case, the flowing current is kept at a constant value by the constant current circuit 16. That is, in this case, the output voltage of the constant current circuit 16 changes by an amount corresponding to the change in resistance value of the variable resistance switch circuit 22, and is changed to a predetermined second voltage value. Therefore, in this state, the voltage is detected by the voltage discrimination circuit 14, and the attached function circuit 1
5 that the handset 19 has entered the talking state. Therefore, even if the auxiliary functional circuit 15 is responding or preparing for a response, its operation is temporarily interrupted and the handset 19 becomes ready for talking.

Next, assume that switch S is turned on. When the switch S is turned on, the resistance value of the variable resistance switch circuit 22 becomes the third resistance value, and the output voltage of the constant current circuit 16 becomes another predetermined constant voltage (the third resistance value).
voltage value). Accordingly, the voltage discrimination circuit 14 detects each of them and puts the auxiliary function circuit 15 into the operating state. For example, if an answering machine, a speaker horn, etc. are used as the attached functional circuit 15, these devices or horns can be connected to the switch S.
By turning on, it becomes operational.
When the auxiliary functional circuit 15 operates, the output from the auxiliary functional circuit 15 causes the current changeover switch circuit 17 to operate, and the current value of the constant current circuit 16 is automatically switched to another large current value. Therefore, the current value flowing through the variable resistance switch circuit 22 increases, the current value detection circuit 25 on the handset 19 side operates, and an operation trigger is given to the automatic dial circuit 26. Therefore, the automatic dialing circuit 26 is activated by the above trigger and automatically dials the pre-registered telephone number. Then, when dialing is started, the switch D _S is turned on and the resistance value of the variable resistance switch 22 changes to another value, so that the output voltage of the constant current circuit 16 changes to another fourth value. becomes the voltage value.
Therefore, the voltage value is detected by the voltage discrimination circuit 14, and the voltage discrimination circuit 14 notifies the auxiliary function circuit 15 that dialing is in progress. When the automatic dialing circuit 26 completes dialing, the switch D _S is turned off and the standby state is restored after a certain period of time.

FIG. 3 is an electrical connection diagram showing the main parts of the above embodiment, and in the figure, Q ₁ to _{Q 3} and R ₁ to _{R 5} are transistors, resistors, and resistors constituting the voltage discrimination circuit 14, respectively.
Q ₄ , ZD ₁ , R ₆ , R ₇ are transistors, Zener diodes, and resistors that constitute the constant current output circuit 16; Q ₅ and R ₈ are transistors, resistors, and R ₉ that constitute the current switching switch circuit 17; R ₁₁ is a resistor that forms a variable resistance switch circuit together with the switch HS, S switch S, and switch D _S that remains on during dialing. Q ₆ and R ₁₂ are transistors and resistors that form the current value detection circuit. V _CC is a rectifier circuit. 13
is the rectified voltage from .

In Figure 3, when switch S is turned on, resistor _R9 is short-circuited, and the Zener diode and resistor
Depending on the output voltage I ₁ of the transistor Q ₄ determined by R ₆ , the output voltage V _S of the constant current circuit 16 is approximately I ₁ × (R ₁₀ +
R ₁₁ +R ₁₂ ). By this voltage, the resistor R ₄ , which constitutes the voltage discrimination circuit 14,
With the threshold determined by R ₅ , the transistor
Q ₃ is turned off, and the fact that switch S is pressed is transmitted to the attached function circuit 15 of the answering machine, etc.
The auxiliary functional circuit 15 becomes operational.

Next, when the switch HS is turned on, the resistance
R ₉ , R ₁₀ are shorted and the output current of transistor Q ₄
Due to I ₁ , the output voltage of the constant current circuit 16 is V _HS ≒ I ₁
It is converted into a third voltage value of ×(R ₁₁ +R ₁₂ ). Therefore, this voltage turns off the transistor Q ₂ as well as the transistor Q ₃ due to the threshold value determined by the resistors R ₂ and R ₃ , and the fact that the switch HS has been operated is transmitted to the attached functional circuit 15. . Therefore, in this state, the attached functional circuit 1
5 cancels the operation or performs operations such as preparing for the operation. The dial signal is sent from handset 1.
This is done on the 9 side, and the switch is turned off while the dial signal is being sent.
Since D _S is turned on, in this case the resistors R ₉ , R ₁₀ ,
R ₁₁ are all short-circuited, and the output voltage of the constant current circuit 16 becomes V _DS ≒ due to the departure current I ₁ of the transistor Q ₄
It is converted into a fourth voltage value of I ₁ ×R _{12 and} output. Therefore, in this case transistors Q ₁ , Q ₂ , Q ₃
At the same time, it is turned off, and the fact that dialing is in progress is transmitted to the attached function circuit 15. Under these conditions, the transistor Q ₆ of the current value detection circuit 25 continues to be turned off by the function of the constant current circuit 16.

Now, the attached functional circuit 15 is an answering machine,
If this answering machine outputs an "L" signal to the output terminal in order to call a pager, etc., this signal is supplied to the transistor _Q5 , so the transistor _Q5 turns on, and the transistor _Q4 The emitter resistance of resistor R ₆ to resistor R ₆
and resistor R ₈ in parallel. When the values of resistor R ₆ and resistor R ₈ are equal to each other, the emitter resistance of transistor Q ₄ is exactly halved and the current flowing through transistor Q ₄ is exactly doubled. Therefore, this current I ₂ =2×I ₁ turns on the transistor Q ₆ constituting the current value detection circuit 25, and provides a trigger to the automatic dialing circuit 26 to start an automatic dialing operation. Therefore,
The automatic dialing circuit 26 operates to automatically dial a predetermined telephone number such as a pager, etc., and after the dialing is completed, the system returns to the standby state.

In this way, according to the above-mentioned embodiment, when the box switch HS is turned on, when the separately provided switch S is turned on, and when dialing is in progress, these states can be detected separately by the attached functions of the answering machine, etc. It has the advantage that it can be transmitted to a circuit, and therefore it is possible to operate an auxiliary functional circuit, such as an answering machine, as easily as before. According to the above embodiment, the inside of the telephone main body can be constructed with fewer parts than before, and the telephone main body itself can be made considerably smaller _. By installing it on the handset side,
This has the advantage that the handset can be kept handy and easily operated.

Further, according to the above embodiment, since the automatic dialing circuit is provided on the handset side and the on/off control is controlled from the telephone main body side, there is no need for any other additional operation, and the effect is excellent in operability. .

In the above embodiment, the switch HS, switch S, and D _S constituting the variable resistance switch circuit 22 can each be replaced with electronic switches such as transistors, and the interlocking between the switches can be performed using other known logic. Needless to say, this can be easily realized using a circuit.

Effects of the Invention As is clear from the above embodiments, the present invention has the following advantages:
A calling circuit and a variable resistance switch circuit are provided on the handset side, and the output voltage of the constant current circuit provided on the telephone body side is converted to different predetermined values by turning on and off the switch provided on the handset side. At the same time, a circuit for discriminating the above-mentioned voltage is provided on the telephone main body side, and the output of this circuit is configured to turn on and off the attached function circuit provided on the telephone main body side. The circuit is installed separately on the handset side, and the attached function circuit is installed on the phone itself.
Furthermore, since the switch and other switches are both provided on the handset side, the interior of the telephone main body can be constructed with fewer parts than in the past, and the telephone main body itself can be made considerably smaller. According to the present invention, the switch HS and the other switches S and _DS are provided on the handset side, which has the advantage that the handset can be easily operated when the handset is at hand.

In addition to the above configuration, a current changeover switch circuit for varying the output power value of the constant current circuit is provided on the phone body side, and a current value detection circuit for detecting changes in the output current value of the above current circuit is provided on the handset side. The device is configured so that the output of the current value detection circuit turns on and off the operation of the automatic dialing circuit provided on the handset side, which eliminates the need for other additional operations and provides excellent operability. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a conventional telephone, FIG. 2 is a schematic block diagram of an embodiment of the telephone according to the present invention, and FIG. 3 is a specific electrical wiring diagram of the main parts of the above embodiment. 11... Telephone main body, 12... Incoming call detection display circuit, 13... Rectifier circuit, 14... Voltage discrimination circuit,
15... Attached functional circuit, 16... Constant current circuit, 1
7...Current selection switch circuit, 18...Code,
19...Handset, 20...Telephone circuit, 21
... Dial circuit, 22 ... Variable resistance switch circuit, 23 ... Transmitter, 24 ... Telephone receiver, 25 ...
Current value detection circuit, 26... automatic dial circuit.

Claims (1)

[Claims] 1. A constant current circuit and a voltage discrimination circuit for discriminating the output voltage of the constant current circuit are provided on the telephone main body side, and the output voltage of the constant current circuit is applied to the handset side, and when the switch is turned on or A variable resistance switch circuit whose resistance value changes when turned off is provided, and the voltage discrimination circuit discriminates a change in the output voltage of the constant current circuit due to a change in the resistance value of the variable resistance switch circuit, and the on/off information of the switch is discriminated by the voltage discrimination circuit. A telephone configured to transmit the voltage to an attached functional circuit such as an answering machine, a speaker horn, etc. provided on the telephone main body side by the output of the voltage discrimination circuit. 2. A constant current circuit, a voltage discrimination circuit for discriminating the output voltage of the constant current circuit, and a current changeover switch circuit for varying the output current value of the constant current circuit are provided on the telephone body side, and the handset side is equipped with The output voltage of the circuit is applied and the switch is turned on.
A variable resistance switch circuit whose resistance value changes when turned off, a current value detection circuit which detects a change in the output current value of the constant current circuit, and an automatic dial circuit are provided. Changes in the output voltage of the constant current circuit are discriminated by the voltage discrimination circuit, and the switch is turned on and off.
The output of the voltage valve circuit transmits the off information to the attached functional circuits such as an answering machine and a speaker horn provided on the telephone main body, and the output of the current value detection circuit operates the automatic dialing circuit. A phone configured to control on and off.