JP2563577B2 - Telephone device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device that is used by connecting to a public telephone line, PBX extension line, or the like.

2. Description of the Related Art FIG. 4 shows the configuration of a conventional telephone device. This telephone device has a full-wave rectifier 8 connected to connection lines L1 and L2 to a public telephone line and a switching to this full-wave rectifier 8. A call circuit 5 connected via a communication transistor Q1, a handset 2 having a receiver R and a transmitter T connected to the call circuit 5, and a call current monitoring unit 6 provided on the connection line. , A signal is input from the incoming call detection unit 7 connected in series with the resistor R1 and the capacitor C1 between the connection lines L1 and L2, the hook switch 1, the dial operation unit 3, the call current monitoring unit 6, and the incoming call detection unit 7 and hooked. It is composed of a control unit 4 and the like for controlling the telephone device in a call state or a standby state by turning on and off the switching transistor Q1 according to an on / off signal of the switch 1.

However, in the above-described conventional telephone device, the handset 2 is returned to the handset stand after the call is finished, but the handset 2 is caught by something and the hook switch 1
If the handset 2 is not turned off, the handset 2 is caught by each of them when moving objects, or if the handset 2 comes off the telephone device due to mischief of a child, etc. There was a problem that the call was in a middle state, and in addition to being unable to call from others, in some cases an additional call charge was incurred.

The present invention solves such a conventional problem, and an object thereof is to provide an excellent telephone device capable of preventing an invalid busy state.

Means for Solving the Problems In order to achieve the above object, the present invention comprises gravity detection means provided in a handset and a timer activated by an output signal from the gravity detection means, and detects gravity during a call. The time when the output signal from the means does not change is measured by a timer, and the telephone is returned to the standby state when it continues for a certain time.

Operation The present invention having the above-described configuration has the following operations. That is, by half the handset or detaching the handset,
If the busy state continues for more than the fixed time set by the timer, the signal from the gravity detection means in the handset does not change, so the occurrence of invalid busy is detected and the telephone device is automatically placed in the standby state. Can be returned.

Embodiment FIG. 1 shows the structure of an embodiment of the present invention.
In FIG. 1, 11 is a hook switch and 12 is a handset 12a.
And a handset having a transmitter 12b, 13 is a dial operation unit, 14
Is a control unit to which the hook switch 11 and the dial operation unit 13 are connected, and 15 is a communication circuit to which the above-mentioned receiver 12a and transmitter 12b are connected.

Reference numeral 16 is a call current monitoring unit provided on the connection lines L ₁ and L ₂ to the public telephone line, and 17 is a capacitor C 1 and a resistor R between the connection lines L ₁ and L _2.
It is an incoming call detection unit connected in series with 1, and both of these units 16 and 17 are adapted to supply their outputs to the control unit 14.

18 is a gravity detecting means provided in the handset 12, and 19 is a control unit 14.
The timer 19 is provided in the gravity detecting means 18
It receives the detection signal of and starts. Reference numeral 20 denotes a full-wave rectifier connected to the connection lines L ₁ and L ₂ , and a switching transistor controlled by the control unit 14 is provided on the output side.
The call circuit 15 is connected via Q1.

FIG. 2 shows a vertical cross-sectional view of the handset 12. The handset 12a and the handset 12b are arranged at both ends of the handset 12, and the gravity selecting means 18 is provided at the center of the handset 12. line
Connected to connector 24 via 21-23, this connector 24
Is connected to the communication circuit 15 via a line 25 connected to.

FIG. 3 is a circuit diagram showing an example of the gravity detecting means 18,
Connecting a plurality of resistors _{R 10, R 11, R 12} , R 13 sequentially in series, a switch for opening and closing when the handset 12 up and down, which is tilted to the left and right
26, 27, 28 and 29 are respectively connected in parallel with the resistors R ₁₀ , R ₁₁ , R ₁₂ and R ₁₃ .

Next, the operation of the above embodiment will be described. In the above embodiment, when handset 12 is in use, the handset 12 is always vertical, for tilting to the right and left, the combined resistance value is changed in the switch 26 to 29 is opened and closed resistor R ₁₀ to R _13, the As a result, the output signal of the gravity detecting means 18 is constantly changing.

However, when the handset 12 is half-hanged or the handset is disengaged, the output signal of the gravity detection means 18 becomes constant, and the timer 19 of the control unit 14 measures the duration time during which the output signal does not change. If this duration exceeds a preset time, the switching transistor Q1 is turned off to release the call circuit 15 from the public telephone line,
Even if the handset 12 is half-hanged or the handset is detached, the telephone device can be automatically returned to the standby state.

As described above, according to the above-described embodiment, when the handset 12 is half-hanged or the handset is disconnected, the call circuit 15 is automatically released from the public telephone line, so that an invalid busy state can be prevented. Have advantages.

In the above embodiment, the handset is detected only by the gravity detecting means 18 and the public telephone line is automatically opened.However, the signal from the conventional call current monitoring unit 16 causes the public telephone line to be disconnected. It may be combined with the function of monitoring the state. In this case, highly accurate control can be performed.

As is apparent from the above-described embodiment, the present invention is configured to detect the occurrence of a handset disconnection or half-hanging and automatically release the telephone device from the public telephone line to return it to the standby state. Therefore, there is an effect that it is possible to prevent an invalid capture of a public telephone line and an invalid busy state of a telephone.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a telephone device according to an embodiment of the present invention, FIG. 2 is a longitudinal section of a handset, FIG. 3 is a circuit diagram showing an example of gravity detecting means, and FIG. 4 is a conventional telephone device. 3 is a schematic block diagram of FIG. 12: handset, 14: control unit, 18: gravity detection means, 19
...... Timer.

Claims (1)

(57) [Claims] 1. A call circuit connected to a telephone line via a switching means, a handset having a handset and a handset connected to the call circuit, and a gravity detection means provided in the handset. A timer that is activated by the output signal from the center of gravity detection means and the time during which the output signal from the gravity detection means does not change during a call are measured by the timer, and the switching means is controlled when it continues for a certain time. A telephone device having a control unit for turning off a call current and returning a telephone to a standby state.