JPS6299240A - Antitheft warning device for car - Google Patents

Abstract

PURPOSE:To prevent a warning sound from being generated in an ordinary use of a car by providing a radio receiver for receiving a specified radio signal, and controlling the operation of a warning sound generating means by means of the output of said radio receiver. CONSTITUTION:An RS flip-flop circuit 8 and an AND gate circuit 9 control the connection of the outputs of various switch circuits 1, 2, 3 to a warning sound generating circuit 5 by means of the received output of a radio receiver 7. In this construction, when a signal for forbidding the operation of the warning sound generating circuit 5 is sent from a radio transmitter, the radio receiver 7 detects this signal, to control the AND gate circuit 9 so as to separate the outputs of the switch circuits 1, 2, 3 from the warning sound generating circuit 5. Thereby, a warning sound will not be generated when a door is opened or closed in the normal use of a car.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is used as a supplementary means for preventing theft of automobiles. In particular, the present invention relates to an automobile theft alarm system that generates an alarm sound when someone other than the user opens the door of the automobile, inserts a key into a key switch, or closes an ignition circuit.

[Conventional technology]

Conventionally, theft prevention of automobiles and items inside the automobile has been carried out using door locks and key switches, but these all depend on the key held by the automobile user. That is,
Without the key, the doors cannot be unlocked and the key switch cannot be turned on to start the engine.

On the other hand, some automobiles are equipped with a theft alarm system that automatically emits an alarm sound when a door is opened and stops the alarm sound when a key is inserted into a key switch.

[Problem that the invention seeks to solve]

However, with conventional car theft prevention methods that rely on keys, the door can be opened without the key by forcing the locked door open or shorting the ignition circuit wiring. Or OJ, whose anti-theft measures are relatively easily defeated, such as by allowing the engine to start? There was a sex. Furthermore, if a duplicate key was created, conventional anti-theft measures were not effective at all.

Furthermore, theft alarm devices that emit an alarm sound when a door is opened always emit an alarm sound even during normal use, which can be extremely troublesome in some cases.

The present invention solves these conventional problems,
An object of the present invention is to provide a theft alarm device for a car that can supplement the prevention of theft when the car is not in use.

[Means for solving problems]

The present invention provides a means for outputting an electric signal when a door is opened, a key is inserted into a key switch, or an ignition circuit is closed, and an alarm sound is generated by the output electric signal of this means. In the automobile theft alarm system, the automobile is equipped with a radio receiver that receives a specific radio signal, and the means for generating the alarm sound is set in an operating mode or disabled by the reception output of the radio receiver. The present invention is characterized by comprising circuit means for controlling the mode.

[For production]

The present invention provides a means for generating an alarm sound when a door of a car is opened, a key is inserted into a key switch, or an ignition circuit is closed, by using a specific radio receiver installed in the car. By prohibiting its operation when a signal is received, the owner or user can select the operation of the theft alarm system whether the vehicle is being used or not, and the operation can be changed from the normal operation. No alarm sound is generated during use, so the anti-theft device can operate effectively.

A radio transmitter that transmits a specific radio signal may be carried by the owner or user, or may be installed in a residence or office.

The burglar alarm device is configured to automatically enter an activated state when receiving an alarm sound generating circuit activation signal transmitted from a wireless transmitter or when a key switch is turned from on to off.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

The figure is a block diagram showing one embodiment of the present invention.

In this embodiment, a configuration will be described in which the theft alarm device is activated when a wireless receiver receives an alarm sound generation circuit activation signal.

In the figure, switch circuit 1 detects that the door is opened, switch circuit 2 detects that the key is inserted into the key switch, and switch circuit 3 detects that the ignition circuit is closed. The output is connected via the OR gate circuit 4 to means for generating an alarm sound, which is comprised of an alarm sound generation circuit 5 and a speaker 6.

The features of the present invention include a wireless receiver 7 surrounded by a dashed line, and the reception output of this wireless receiver 7 controls the connection between the output of each switch circuit 1.2.3 and the alarm sound generating circuit 5. RS flip-flop circuit 8 and AND gate circuit 9 are provided. That is, an AND gate circuit 9 which takes the output of the OR gate circuit 4 as one input and takes the output Q of the RS flip-flop circuit 8 as the other input.
This controls the operation of the alarm sound generating circuit 5.

The radio receiver 7 outputs logic "1" to the set terminal S of the RS flip-flop circuit 8 when the alarm sound generation circuit activation signal is received, and outputs the logic "1" to the set terminal S of the RS flip-flop circuit 8 when the alarm sound generation circuit activation signal is received. rlJ is output to the reset terminal R of the RS flip-flop circuit 8.

Therefore, the alarm sound generating circuit activation signal is transmitted to the wireless receiver 7.
When received, the output Q of the RS flip-flop circuit 8 becomes logic rlJ, enabling the output of the switch circuit 1.2.3 via the OR gate circuit 4. When the alarm sound generating circuit operation prohibition signal is received by the radio receiver 7, the output Q'lJ of the RS flip-flop circuit 8 is
0'', invalidating the outputs of the switch circuits 1, 2, and 3 and prohibiting the operation of the alarm sound generating circuit 5.

That is, when the car is parked for a long time, the wireless transmitter transmits a burglar alarm activation signal that activates the alarm sound generation circuit 5, and the wireless receiver 7 detects this signal and activates the switch circuit 1. The AND gate circuit 9 is controlled to connect each output of 2.3 to the alarm sound generating circuit 5. Therefore, in this state, if a theft situation occurs such as the door being opened or the wiring of the ignition circuit being short-circuited, the alarm sound generation circuit 5 operates and the speaker 6 emits an alarm sound.

Therefore, when the user gets into the car, the operation of the alarm sound generating circuit 5 must be prohibited.

That is, the radio transmitter transmits a signal that prohibits the operation of the alarm sound generation circuit 5, and the radio receiver 7 detects this signal and connects each output of the switch circuit 1.2.3 to the alarm sound generation circuit 5. AND gate circuit 9 is controlled to disconnect. As a result, an alarm sound will not be emitted even if the door is opened, for example.

As described above, in the burglar alarm device of the present invention, the alarm sound generating circuit 5 is in standby state for the output of each switch circuit 1, 2, 3 by the alarm sound generating circuit activation signal, the door is opened, and the key is in the key switch. The device is configured to generate an alarm sound when the ignition circuit is closed, etc., but the owner or user must send a specific wireless signal (alarm sound generation circuit operation prohibition signal) in advance When the radio receiver 7 of the automobile receives this signal, the operation of the alarm sound generating circuit 5 is prohibited. Therefore, if this specific radio signal is not received, an alarm sound will be emitted when the above situation occurs, and the occurrence of the theft situation can be notified to the outside.

The wireless transmitter sends a burglar alarm activation signal.

The above-described system is configured to activate the theft alarm device when the wireless receiver 7 of the automobile receives this signal, as in the case of commercial vehicles, for example.

This avoids the complexity of transmitting a specific radio signal that prohibits the operation of the alarm sound generation circuit 5 each time when the engine is turned on and off frequently, and is useful in cases where theft is likely to occur, such as when the engine is parked for a long time. The theft alarm device can be activated at will.

On the other hand, while the key switch is on, the operation of the alarm sound generation circuit 5 is prohibited, and when the key switch is turned off, the predetermined time required to remove the key (
It is also possible to configure the device so that the prohibition of the operation is automatically canceled after a period of 1 second or more, and the device returns to the activated state. In this case, if the key is left inserted, the theft alarm system is activated and an alarm sound is generated, thereby preventing forgetting to remove the key.

As described above, while the car is being used normally, the theft alarm system is inactive, so no alarm sound is generated when the door is opened or closed when getting in or out of the car.

If the radio receiver 7 of the automobile receives a specific radio signal that prohibits the operation of the alarm sound generation circuit 5 and the key switch is not turned on within a predetermined period of time, the alarm sound generation circuit 5 is automatically activated. It is also possible to cancel the prohibition of the operation and return the theft alarm device to the activated state. This circuit configuration uses a combination of a gate circuit and a timer circuit to manually control the output of the RS flip-flop circuit 8 and the output of the switch circuit 3 that notifies the closing of the ignition circuit.
Can be easily configured.

Note that the wireless signal described in this embodiment uses a frequency band that can be operated without permission, and uses a pulse code method for identification. Furthermore, the radio receiver 7 is installed in a place that cannot normally be accessed from the outside, such as in an engine room.

〔Effect of the invention〕

As explained above, the present invention is applicable to a vehicle equipped with a theft alarm device that generates an alarm sound when the door is opened or the wiring of the ignition circuit is short-circuited outside of the vehicle operating hours. First, since the operation of the theft alarm device can be inhibited by a specific signal transmitted from the user's wireless transmitter, the theft alarm device can be used without any hindrance to normal use.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 1.2.3... Switch circuit, 4... OR gate circuit, 5... Alarm sound generation circuit, 6... Speaker, 7
...Radio receiver, 8...RS flip-flop circuit, 9...AND gate circuit.

Claims (1)

[Claims] (1) A means for outputting an electric signal when a door is opened, a key is inserted into a key switch, or an ignition circuit is closed, and an alarm sound is generated by the output electric signal of this means. In the automobile theft alarm system, the automobile is equipped with a radio receiver for receiving a specific radio signal, and the means for generating the alarm sound is set in an operation mode or an operation prohibition mode by the reception output of the radio receiver. A theft alarm device for an automobile, characterized in that it is equipped with circuit means for controlling.