CN2060002U

CN2060002U - Supersonic anti-theft alarm

Info

Publication number: CN2060002U
Application number: CN 89207162
Authority: CN
Inventors: 刘玉华
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-05-13
Filing date: 1989-05-13
Publication date: 1990-08-01

Abstract

The utility model relates to a supersonic anti-theft alarm which is composed of the acousto-optic generator of a transmitter and a receiver and a power source. The transmitter and the receiver are right oppositely placed or placed towards a reflecting surface. An incidence angle is equal to a reflection angle. In the transmitter, an electricity sound energy transducer can be used as a transmitting device. In the receiver, a sound electricity energy transducer can be used as a receiving device. Ultrasonic beams can be transmitted from the transmitter to enter the receiver and can form an invisible blocked line in space, and the receiver can emit acousto-optic alarm when the ultrasonic beams are cut off by people. The utility model has the advantages of small wrong report possibility, large adapting occasions, simple circuit and low cost, and is suitable for banks, storehouses, residences, gates, garages, wharfs, outdoor cargoes, etc.

Description

Supersonic anti-theft alarm

The utility model belongs to burglar alarm.

The development in society and economy increases its demand to burglar alarm day by day, contactless burglar alarm is such as Infrared intrusion detector and ultrasound wave alarm, because it has the detectivity to the moving object acumen, make stealer unexpectedly touch warning, be subjected to user's favor especially.But existing Infrared intrusion detector and ultrasound wave are reported to the police its deficiency are all arranged.Infrared intrusion detector is abutted against and is received or survey infrared beam and report to the police, but it is a lot of to send the object of infrared light, this make infrared alarm some occasion Chang Yingan around infrared light false alarm appears.By contrast, can send hyperacoustic object and want much less, the wrong report possibility of ultrasound wave alarm is therefore much smaller.Existing Ultrasonic Intruder Alarm is according to Doppler effect work, this make it can only be used in sealing, acoustic reflection place preferably, such as in the room, warehouse etc., inoperative in outdoor or very big house.

The purpose of this utility model is to overcome above-mentioned deficiency, provide a kind of can indoor again can be in the Ultrasonic Intruder Alarm of outdoor application, it has day and night no matter, applicable situation is big, wrong report property is little advantage.

The technical scheme that achieves the above object is as follows: ultrasonic transmitter sends the inaudible ultrasound wave of a branch of people's ear and forms indiscoverable blockade line, the length of blockade line is by emission temperature and receiving sensitivity decision, the transmitter right opposite is equipped with the ultrasound wave receptacle, when personage or object blocking ultrasonic beam, ultrasonic receiver is just reported to the police with sound, light or alternate manner.Receiver and transmitter can also all be faced a reflecting surface except over against placing, and such as wall, the sound wave incident angle equals reflection angle, and when human body or object blocking incident wave or reflection wave, receiver is reported to the police equally.

Description of drawings.

Fig. 1 is a functional-block diagram of the present utility model.

Fig. 2 is the electric functional-block diagram of embodiment.

Fig. 3 is the transmitter electrical schematic diagram of Fig. 2.

Fig. 4 is the receiver electrical schematic diagram of Fig. 2.

Below in conjunction with a description of drawings embodiment of the present utility model.

The work of transmitter is referring to Fig. 3.

This machine is made main device by integrated circuit 4011 and is finished vibration and drive function, and the ultrasound wave that gives off 40KHZ by ultrasonic transducer goes receiver control.Controlled oscillator is served as with door 2 by the door 1 in 4011, the frequency of operation of R5 decision oscillator, the frequency of operation of R5 transfers to 40KHZ usually, and the ultrasonic transducer of transmitter is most effective under this frequency, and oscillator signal removes to drive ultrasonic transducer by door 3, door 4.

Power supply is partly supplied with by the 9V direct current, this machine can be used power of alterating and direct current, its exchange is finished by miniature relay, during no alternating current, and not adhesive of relay, the J1-2 of relay connects, the 9V direct supply is powered to transmitter, relay adhesive when alternating current is arranged, and J1-1 connects, direct supply disconnects, and civil power is powered to transmitter.When working long hours by 220 volts of alternating currents through the power transformer step-down, bridge rectifier is by three end pressure regulation, voltage stabilizing, be filtered into direct current 9V and supply with transmitter.During power failure in the automatic changing-over machine 9 volts build up the power supply of battery short-term, when civil power comes, recovery automatically again.Like this, both made artificial cut-out civil power electric wire that transmitter is quit work.

The work of receiver is referring to Fig. 4.

The acoustical signal that the receiver ultrasonic transducer is picked up is very faint, can improve because of the resonant frequency of 40KHZ by the transducer behind efficiency, can make receiver be subjected to the noise ripple of parasitic disturbances and get rid of other, avoid false alarm, this also is that Ultrasonic Intruder Alarm is than other infrared type alarm effect height, the major reason of not reporting by mistake.T1 high-gain common-emitter amplifier, R2 is its collector load, R1 is for base bias, transducer is high because of resistance, not influence of bias voltage to T1, small voltage on the T1 does not have any influence to transducing yet, and C2 reduces the rf gain of T1, can prevent like this because unstable or receive the interference that strong radio signal produces.The output voltage of T1 is coupled to T2 high-gain common-emitter amplifier by C3, so that effectively be coupled the 40KHZ signal, and other sound signal is excluded.The second level is except that reduction high-frequency gain electric capacity of no use, and other is the same with the first order.In order to drive relay J 1, the T2 collector signal is coupled through C4, form rectification circuit by D1, D2, C5 makes the cunning that flattens of the pulsating direct current output voltage after the rectification, and this Dc bias makes the T3 conducting, makes the relay in the collector circuit get electric adhesive, at this moment, J1-1 closes, and J1-2 opens, and so integrated package 555 pin 4 no-voltages are not starting of oscillation.C10 and R8 are connected to pin 4, constitute the delay circuit of integrated package 555, and the numerical value that changes C10 and R8 can change delay time.Burglar alarm is to utilize human body blocking ultrasonic beam, makes the relay electric-loss in the receiver, disconnects J1-1, and closed J1-2 charges to C10, human body leaves the adhesive again of back relay, and J1-2 disconnects, the J1-1 closure, the C10 discharge, 555 starting of oscillation work, loudspeaker send chimes of doom and reach antitheft purpose.Circuit failure of oscillation when the voltage of C10 is lower than 0.4 volt because of discharge.Integrated package 555 pin 4 are connected with R8 with C10, make integrated package 555 play the effect of time-delay and pronunciation vibration simultaneously, and circuit is simple, and cost is low.

The power supply of receiver and transmitter power supply are just the same, can automatically switch, and no longer discuss principle of work here.

Transmitter and receiver are placed on the distance of being separated by about 15 meters respectively, plugging alternating current respectively gets final product, it is also luminous to report to the police automatically when the control space has the people to move, and also can draw loudspeaker to the reception room, and Be Controlled is local noiseless unglazed, this machine does not need to reset, automatically warning is 10 seconds, if having a power failure or the artificial AC power of cutting off of chance, this machine is the interior dc battery of changing-over machine automatically, automatically connect civil power behind the incoming call, dry cell in the stapling machine.

This alarm compared with prior art has the following advantages:

1, adopt ultrasonic emitter and receiver spare, have wrong report property little thereby be applicable to the indoor and outdoor, regardless of the advantage of day and night;

2, circuit is simple, and cost is low;

3, alternating current-direct current automaticallyes switch, and energy long-term work and anti-destructive are good.

Claims

1, Ultrasonic Intruder Alarm, it is made up of transmitter, receiver, acousto-optic generator and power supply, transmitter and receiver are over against placement, or all a reflecting surface is placed, the sound wave incident angle equals reflection angle, it is characterized in that transmitter does ballistic device with electro-acoustic transducer, receiver is done receiving device with sound-electric transducer.

2, alarm according to claim 1 is characterized in that the warning circuit of receiver is made of integrated package 555, and its pin 4 is connected to the delay circuit that C10 and R8 form, and it discharges and recharges and closes, opens control by J1-2.

3, alarm according to claim 1 and 2 is characterized in that transmitter and receiver with the relay power of alterating and direct current that automaticallyes switch, and direct supply is succeeded the normally closed point of electrical equipment, and alternating current is succeeded electrical equipment and often made war.