RU1793451C - Device for guard alarm - Google Patents

Abstract

The invention relates to alarms and can be used to protect, for example, a wallet, purse, etc. The aim of the invention is to increase the functional reliability of the device. The object of the invention is achieved. that a device containing a sensing element, a switch, a low-frequency generator, an audio frequency generator, and a sound emitter includes a microwave generator, a detector, a DC amplifier, a key and a power amplifier, the switch is made in the form of a permanent magnet and reed switch. When trying to remove the protected object when the hand of the person withdrawing approaches the sensitive element, an audio signal is generated, warning the owner of the object about such an attempt, 1 ill. .

Description

The invention relates to alarms and can be used, in particular, for the individual protection of jewelry contained in a cosmetic bag, as well as for the protection of a wallet.

. A device is known comprising a telephone, an alarm unit, a power source and a switch; moreover, the telephone is mounted on the side wall of the bag, an alarm unit with a power source is attached to its base, and the switch is connected to an additional belt, the loop of which is worn on the arm. The bag is usually worn on the shoulder and when it is attempted to be stolen, i.e. by force acting on the bag, the alarm unit is turned on and an alarm is generated. From the description of the operation of the device it can be seen that the alarm system protects the bag itself, but not its contents. Therefore, it is enough for an attacker to make an incision in the bag and remove the wallet and jewelry

and t. items. while the alarm does not work,

A device is known comprising an alarm sensor including an oscillating circuit, two capacitors and two diodes, a signal driver including a switch, an amplifier, a delay element and an audio signal generator, as well as a telephone, a transmitter and a transmitting antenna. in that, under the influence of an attacker, the contact of the switch is turned on and high-frequency oscillations are generated in the oscillating circuit, which are amplified and simultaneously fed to the transmitter and to the generator uko-. howling frequency. An alarm through the antenna is emitted by the transmitter into space, and audio signals are fed to the telephone. This shows that the theft alarm and the alarm

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into space are determined by the oscillatory parameters of the circuit, i.e., the notification is short-term and one-time. It should also be noted that the presence of a transmitter in the alarm device determines the participation of law enforcement agencies, which should provide for the search and detection of an attacker. However, the short duration of radiation into the alarm space significantly complicates the search for an attacker.

A device is known which is closest in technical essence to the proposed device, which contains a reed switch, a magnetic card, a switch, five resistors, a capacitor, a transistor, an integrated circuit; including two comparators, a comparison circuit, a transistor, an inverter, as well as a transonic transducer.

The essence of the specified device is as follows.

Due to the fact that the alarm device is completely made on a printed circuit board, it is inserted into the outer pocket of the jacket, and the magnetic card is inserted into the wallet, which is removed into the inner pocket of the jacket. The pairing of the alarm device with a magnetic card creates an open state of the contacts of the reed contact, that is, the alarm is disabled. When you try to remove the paper contact, the contact of the reed switch closes and the voltage is applied to the alarm device from an auto-small power source. This creates an imbalance at the outputs of the comparators and the voltage from the output of the inverter is applied to the collector of the transistor T1 and a piezoacoustic transducer that plays an alarm.

It is known that the device structurally consists of two independent parts: an alarm device and a magnetic card. The device works reliably only if the inside and outside pockets in the jacket are correctly paired, i.e. Jacket pockets should be sewn with the alarm device in mind, which is almost unlikely. Otherwise, the specified device does not work. It is completely incomprehensible what a wallet owner should do if he needs, for example, to get money. Simply remove a wallet with a magnetic card or an alarm device from your pocket, because in t bm and in another case, an alarm will turn on. If it is convenient to turn off the alarm, then it will be convenient for the attacker to do it. In addition, an attacker who knows the principle

It is enough to operate the device, before removing the wallet, bring your magnetic card to the outer pocket of the jacket and thereby neutralize the signal device. It should also be noted that this device cannot be used to protect a handbag-cosmetic bag, which, as a rule, is randomly located and is in a large bag,

The purpose of the invention is to increase the functional reliability of the device.

The object is achieved in that a microwave generator, a detector, a DC amplifier, a key and a power amplifier with their connections are introduced into a device comprising a sensor, a switch, a low frequency generator, an audio frequency generator and an audio emitter.

.. The drawing shows a functional diagram of the device, where 1 is the first output of the power source, 2 is the second output of the power source, 3 is a switch, 4 is an ultra-high frequency (microwave) generator, 5 is an audio frequency generator, b is a low frequency generator, 7 - detector, 8 - direct current amplifier (DCT), 9 - power amplifier, 10 - key, 11 - sound emitter, 12 - sensitive element,

The first terminal 1 of the power source is connected to the first terminal of the switch 3, the second terminal of which is connected to the first terminals of the power supply of the microwave generator 4, UPT 8, generator 5, audio frequency generator b, low frequency amplifier 9 power and information input key 10. The output of the amplifier 9, the power through the sound emitter 11 is connected to the second terminal 2 of the power source, to the input of the key 10, to the terminal of the power of the detector 7, to the second terminal of the power supply of the microwave generator 4 and UPT 8. The output of the sensor 12 is connected to the input of the microwave generator. The output of the microwave generator 4 is connected to the input of the detector 7, the output of which through the CTD 8 is connected to the control input of the key 10, the output of which is connected to the second power terminals of the sound frequency generator 5 and low frequency generator 6. The output of the low frequency generator 6 is connected to the control input of the sound frequency generator 5, the output of which is connected to the control input of the power amplifier 9.

The principle of operation of the proposed device is as follows.

After all the necessary items are put in this bag, including a purse with money, the bag lock is closed. In this case, in the switch 3 under

By the action of the magnetic field of the permanent magnet, the reed contact is closed and the power supply is supplied to the microwave generator 4, DC amplifier 8, key 10, sound frequency generator 5, low frequency generator 6 and power amplifier 9. The alarm device is in standby mode. In this state, the microwave generator 4 generates high-frequency oscillations that are detected, and the value of the constant component is supplied to the input of the UPT 8. The potential 10 is closed by the zero potential from the output of the UPT 8 and the sound and low-frequency generators 5 and 6 do not reproduce low-frequency vibrations, When unauthorized exposure to the handbag, i.e. when you touch the electrodes 12 with your hand (foil or thin metal mesh),

Claims (1)

. The claims A theft alarm device comprising a sensing element, a switch, the first terminal of which is connected to the first terminal of the low frequency generator, the second terminal of which is connected to the first terminal of the sound generator and sound emitter, characterized in that, for the purpose of to increase the functional reliability of the device, an ultra-high frequency generator, a detector, a direct current amplifier, a key and a power amplifier are introduced into it, the sensitive element is made in the form of electrodes, the switch is made in the form of a permanent magnet and a reed switch, the second terminal of which is connected to the first terminal of the power source, and the first to the first terminals of the microwave power supply and the DC amplifier, with the second terminal of the generator power supply sewn into the side walls of the bag, the capacitance of the circuit of the microwave generator 4 changes and the generation is disrupted. From the output of the CTF 8, a single potential is supplied to the input of the key 10, the key 10 is opened and the second output 2 of the power supply is connected to the generators 5 and b of the audio frequency and low frequency. The generators 5, 6 are started, and since the frequency of the sound frequency generator 5 is 1 kHz (based on the physiological properties of the human hearing organs), and the frequency of the pause generator 6 is 2 Hz, oscillations are discretely reproduced at the output of the sound generator 5 sound frequency. These vibrations are amplified and fed to the sound emitter. An emitted acoustic alarm signals an attempt to steal a purse. sound frequency and with an input, a power amplifier whose output is connected to the first output of the sound emitter, and the control input is connected to the output of the sound frequency generator, the output of the microwave generator is connected to the detector input, the output of which is connected to the control input through the DC amplifier key, the information input of which is connected to the power output of the low-frequency generator, the output of which is connected to the control input of the sound frequency generator, the second output of the power source is connected to the output pi Ani detector with second terminals of the power generator of microwave frequency, an amplifier a DC output with a key and with a second terminal of the sound emitter, the sensor output is connected to the input of the ultra-high frequency generator.