JPH10215214A - Portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent a portable telephone set from being left in a vehicle when a user stops an engine and gets off from the vehicle by detecting that the supply of power from an external power source is interrupted and informing a user of it by driving a ringing element. SOLUTION: When the engine of the vehicle is stopped and an accessory switch is turned off, the supply of power from the battery of the vehicle to the external power supply terminal 1 is interrupted. At this point, an external power detection means 2 detects that the supply of power from the battery is interrupted and a detection signal is outputted to a ringing element driving circuit 3 and a timer circuit 5. When the detection signal is outputted, the ringing element driving circuit 3 supplies a driving signal to the ringing element 4. Thus, the driving element 4 starts ringing and informs the user that the accessory switch is turned off. The engine of the vehicle is stopped, the accessory switch is turned off, the ringing element 4 is driven, ringing sound is generated, the leaving of the portable telephone set is warned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable telephone, and more particularly, to a portable telephone mounted on an automobile.

[0002]

2. Description of the Related Art Conventionally, a portable telephone of this type is supplied with power from a vehicle battery when the vehicle is mounted on the vehicle, and stops the engine of the vehicle when the user leaves the vehicle to turn off an accessory switch. A device that switches power supply to a secondary battery in a mobile phone is known.

Further, as described in Japanese Patent Application Laid-Open No. 4-310440, even if an accessory switch of a car is turned off, power is supplied to a base unit of a car telephone device connected to the car so that a user can use the power supply. It is also known that a portable telephone device can be used by carrying a child device when leaving the vehicle.

[0004]

However, in these prior arts, the capacity of the battery of the portable telephone can be saved by using the battery of the car when mounted on the vehicle, but the user stops the engine of the car. In particular, when the user gets off the vehicle, there has been a problem that the mobile phone is left in the car because no measures are taken to prevent the mobile phone from being left behind.

The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a portable telephone capable of reliably preventing the portable telephone from being left in a vehicle.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a portable telephone which supplies power from an external power source when the vehicle is mounted on a vehicle and performs a telephone call. Means for detecting that supply of power has been interrupted, and driving means for operating in response to a detection signal of the detection means and supplying a driving signal to the sounding element to generate a sound to the sounding element. Features.

[0007]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a mobile phone according to the present invention.
In FIG. 1, a microphone that collects sound,
Configurations of a mobile phone, such as a circuit and an antenna for wirelessly transmitting audio, a circuit for demodulating a received wireless signal, and a speaker for reproducing the demodulated signal as audio are omitted, and only the configuration of main parts is shown.

In the present embodiment, when a mobile phone is mounted on a car as described in the related art, the mobile phone is connected to an external device such as a hands-free device to supply power from the battery of the car to the mobile phone. And make a call using the power from the battery. On the other hand, when the accessory switch is turned off when leaving the automobile, the power supply from the battery is cut off by disconnecting the connection with the external device, and the power supply is automatically switched to the power supply from the secondary battery in the mobile phone.

In FIG. 1, reference numeral 1 denotes an external power supply terminal connected to a battery (not shown) of an automobile to supply power from the battery to the portable telephone. In the present embodiment, when the accessory switch (not shown) is turned off by stopping the engine of the automobile as described above, the power supply from the external power supply terminal 1 is cut off, and the power is automatically supplied from the internal secondary battery. Is supplied.

The external power supply detecting means 2 is a detection circuit for monitoring the power supply from the external power supply terminal 1 and outputting a detection signal when the power supply from the external power supply terminal 1 is cut off. The ringing element driving circuit 3 supplies a driving signal to the ringing element 4 when a detection signal is output from the external power supply detecting means 2, and the timer circuit 5 is activated by the detection signal of the external power supply detecting means 2. This is a circuit that outputs a stop signal to the ringing element drive circuit 3 after a predetermined time. As the ringing element 4, for example, a buzzer or the like is used.

Next, a specific operation of the present embodiment will be described in detail with reference to FIG. In FIG. 2, first,
When the engine of the vehicle is stopped in S1 and the accessory switch is turned off, the supply of power from the vehicle battery to the external power supply terminal 1 is cut off as described above (S1).
2). At this time, the external power detection means 2 detects that the power supply from the battery has been cut off, and outputs a detection signal to the ringing element drive circuit 3 and the timer circuit 5 (S
3).

When the detection signal is output, the ringing element driving circuit 3 supplies a driving signal to the ringing element 4 (S4).
As a result, the ringing element 4 starts ringing (S5), and notifies the user that the accessory switch has been turned off. That is, when the engine of the vehicle is stopped and the accessory switch is turned off, the ringing element 4 is driven to generate a ringing sound, thereby notifying the user that the mobile phone is not left in the vehicle. .

On the other hand, when the detection signal is output, the timer circuit 5 starts a timer operation (S6). The timer circuit 5 sets a predetermined time, for example, 3 seconds or 5 seconds, and when the timer circuit 5 has counted the predetermined time (S7), the ringing element driving circuit 3 sends a ringing element to the ringing element driving circuit 3. Then, a stop signal for stopping the driving of No. 4 is output (S8).

Upon receiving the stop signal, the ringing element driving circuit 3 immediately stops supplying the driving signal to the ringing element 4 and stops generating a sound by the ringing element 4 (S).
9). As described above, when a predetermined time has elapsed since the accessory switch was turned off, the sounding operation of the sounding element 4 is automatically stopped.

[0015]

As described above, according to the present invention, when the power supply from the battery is cut off, the sounding element is driven to notify the user, so that the user stops the engine. There is an effect that it is possible to reliably prevent the portable telephone from being left in the vehicle when the user gets off the vehicle.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a main part of an embodiment of a mobile phone according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 External power supply terminal 2 External power detection means 3 Ringing element drive circuit 4 Ringing element 5 Timer circuit

Claims (2)

[Claims] 1. A portable telephone which supplies power from an external power supply when in-vehicle and performs a telephone call, a ringing element, and means for detecting that the supply of power from the external power supply is cut off,
A cellular phone comprising: a driving unit that operates in response to a detection signal of the detection unit and supplies a driving signal to the ringing element to generate a ringing sound in the ringing element. 2. The mobile phone according to claim 1, wherein
A cellular phone, comprising: timer means that is activated by a detection signal of the detection means and outputs a stop signal for stopping the driving of the sounding element to the driving means when a predetermined time has elapsed.