CN2252368Y

CN2252368Y - Cipher type anti-theft alarm

Info

Publication number: CN2252368Y
Application number: CN 96207839
Authority: CN
Inventors: 陈少华
Original assignee: 陈展雄
Priority date: 1996-04-17
Filing date: 1996-04-17
Publication date: 1997-04-16
Anticipated expiration: 2006-04-17

Abstract

The cipher type burglar alarm comprises a control box, cipher keys, a reed switch, a permanent magnet and the like, wherein a control circuit board of the burglar alarm is fixed in the control box, and the cipher type burglar alarm is characterized in that: the control circuit consists of a magnetic control switch, an alarm trigger circuit consisting of a basic time circuit and peripheral components thereof, a time delay circuit, a password control circuit and an alarm sound generating circuit. It has the advantages of few elements, simple structure, reliable performance and the like. The control key is only provided with three cipher keys, so the volume is small and the installation is convenient. Meanwhile, the password of the machine is controlled by the pressing sequence and times, the action amplitude is small, and other people are not easy to perceive, so the confidentiality is strong.

Description

The cipher burglar alarm

The utility model belongs to a kind of burglar alarm, relates to a kind of cipher burglar alarm.

Existing burglar alarm is of a great variety, adopts the burglar alarm of cryptographic key form also to have multiple.In these like products, the keyboard of used password box is all bigger in general, and button is also many.Therefore encryption apparatus is not easy to install, troublesome poeration, and action is big, is easily found by the people, so confidentiality is relatively poor.The internal wiring of general crypto-alarm circuit is complicated in addition, and on-off circuit is controlled by relay, gives like this and produces debugging and use maintenance all to bring inconvenience, and production cost is very high simultaneously, so the market price is very expensive.On function, the general alarm device only establish open alarm or warning function just as an additional function of doorbell.

The purpose of this utility model is a kind of cipher burglar alarm of design, and the keyboard that this alarm adopted is little and lack.Only need to reach the purpose of control by pushing cryptographic key order and number of times; Adopting the method that door-opening password is set simultaneously, must be by just opening the door to putting password, do not know that password or password then report to the police immediately by the person not being opened the door by force.

The purpose of this utility model realizes by following scheme: the cipher burglar alarm is by control enclosure, compositions such as cryptographic key, tongue tube and permanent magnet.The control enclosure internal fixation has the control circuit board of burglar alarm, it is characterized in that: this control circuit by magnetic switch, when base circuit and peripheral component thereof alarm trigger circuit, delay circuit and the cipher control circuit, the alert sound that are constituted circuit takes place is formed; The input end of circuit when the magnetic switch of being made up of tongue tube and permanent magnet connects base, the output terminal of circuit connects alert sound circuit and loudspeaker takes place during base; The CP that password key then connects the decadic pulsing counting/divider that two polyphones join respectively goes into end, and the selection output terminal of second step-by-step counting/divider is by behind the triode, the Enable Pin of circuit when connecting base.

The cipher burglar alarm can be controlled early warning or alarm condition by the password form by the people, thereby makes its function upgrading.It has advantages such as element is few, simple in structure, dependable performance in addition.Its operating key is only established three cryptographic keies, and volume is little, easy for installation.The password of this machine is controlled by pushing order and number of times simultaneously, and movement range is little, other people are subtle, so strong security.The Enable Pin that this machine adopts electronic switch to come control triggering electric circuit is compared with control relay circuit, has reduced cost, has also improved the reliability of complete machine, has increased serviceable life.Also design has the relay installation site of reporting to the police and exporting on the printed-wiring board (PWB) of this machine.To pack into to drive outside bigger alarm mechanism behind the relay, as light, big alarm bell etc., thereby enlarges the power of alarm.In addition, this device inside is provided with two groups of password setting selector switch, and the user can indiscriminately ad. as one wishes change password, therefore more improves its confidentiality.Have a power failure in order to deal with AC network, this device is provided with direct supply, can connect automatically behind the mains failure.

Fig. 1 is an outer shape synoptic diagram of the present utility model

Fig. 2 is an electrical schematic diagram of the present utility model

Be described as follows below in conjunction with drawings and Examples:

As shown in Figure 1, the cipher burglar alarm is made up of control enclosure 1, password key 2, tongue tube 3, permanent magnet 4 etc.Described password key 2, design has three cryptographic keies.Tongue tube 3 and permanent magnet 4 all are assemblied on the door.

In Fig. 2, circuit etc. takes place and forms in alarm trigger circuit, delay circuit and cipher control circuit, the alert sound that circuit and peripheral component thereof are constituted when being contained in control circuit in the control enclosure 1 by magnetic switch, base.Described magnetic switch comprises tongue tube 3 and permanent magnet 4.The input end of circuit 5 when the output of magnetic switch connects base, circuit 6 (adopting the KD9561 integrated circuit) and loudspeaker 7 take place in the alert sound of output connection of circuit during (adopting the NE555 integrated circuit) base.

During use, magnetic switch is loaded on the door, and when closing to the doorstep, permanent magnet 4 is close with tongue tube 3.Because two contacts in the magneticaction of magnet, tongue tube are connected, the input end of circuit 5 when making base (two pin) be a high level state, so circuit is in reset mode when basic, output terminal (tripod) then is a low level.Alert sound generation circuit 6 by output terminal control is not worked; In case there is the people to push door open, cause magnet to separate with tongue tube, magnetic force can't affact on the tongue tube, then two contacts in the tongue tube 3 separately, when base, the input end of circuit 5 was transfused to a low level trigger pip, circuit triggers set during base as a result, and output terminal becomes high level, circuit 6 energising work take place in the alert sound by its control, and promotion loudspeaker 7 sounds the alarm.In case report to the police, if close to the doorstep, then alarm song will be kept a period of time and just stops, and its duration is decided by delay circuit.Delay circuit is electric capacity 8 and the resistance 9 that is serially connected between the tongue tube other end and the ground, and six or seven pin of circuit 5 join when this electric capacity and resistance connection and base.

Cipher control circuit comprises cryptographic key 2 and two decadic pulsing counting/dividers 10,11.Cryptographic key 2 is by AN ₁, AN ₂, AN ₃Three buttons are formed.Cryptographic key AN ₁" CP " that connect step-by-step counting/divider 10 goes into end, and it selects output all to connect cryptographic key AN ₃And cryptographic key AN ₃Go into end with " CP " of step-by-step counting/divider 11 and join, the Enable Pin (four pin) of circuit 5 when the selection output of this integrated circuit connects base by triode 12.Between the base stage and ground of triode 12, be connected to charging, discharge capacity 13.Cryptographic key AN ₂Then be connected with zero clearing, the reset terminal of step-by-step counting/divider 10,11 respectively.

During use, press button AN ₁, whenever press the high level pulse signal of CP end input that once just equals at counter 10, its output terminal Q ₀-Q ₈Order is exported high level successively, and Q at any time ₀-Q ₈Only there is an output terminal to become high level.The input end of integrated circuit 11 " CP " then with the Q of integrated circuit 10 ₀-Q ₈One of be connected.Have only when this link is high level, it is just effective to press button AN3 again.This shows that two factors of having enabled of integrated circuit 10,11 restrict; The one, the order of button, the 2nd, the number of times that button is pushed, both are indispensable.Have only a certain selection output terminal (being Q6 in this example) of second integrated circuit 11 to be output as high level, thereby make the base stage conducting of triode 12, the Enable Pin (being four pin in the present embodiment) of circuit 5 is equivalent to ground connection when at this moment basic, this circuit 5 is resetted by force, and circuit for alarming is inoperative.That is: early warning and alarm condition all are disengaged.No matter door is opened at this moment, door closes and leaves to come in and go out, all do not report to the police.If the recovery alert status, as long as press button AN ₂Get final product, at this moment two decadic pulsing counting/dividers 10,11 all are cleared and reset.Because the effect that discharges and recharges of electric capacity 13, the base stage of triode 12 still keeps noble potential in a period of time, discharge along with electric capacity 13, the base potential of triode 12 reduces gradually, to being become by conducting, ends by triode 12, the Enable Pin of circuit 5 becomes high level again when then basic, and circuit 5 recovers alert status during base.Just because of the existence of electric capacity 13, still allow the people to pass in and out door and can not cause warning for some time after making zero clearing, can not send chimes of doom when like this early warning being set, avoided misoperation.

Claims

1, a kind of cipher burglar alarm, form by control enclosure, cryptographic key, tongue tube, permanent magnet, the control enclosure internal fixation has the control circuit board of burglar alarm, it is characterized in that: this control circuit by magnetic switch, when base circuit and peripheral component alarm trigger circuit, delay circuit and the cipher control circuit, the alert sound that constitute circuit takes place is formed, the input end of circuit (5) when the magnetic switch of being made up of tongue tube (3) and permanent magnet (4) connects base, the output terminal of circuit (5) connects alert sound circuit (6) and loudspeaker (7) takes place during base; The CP that password key (2) then connects the decadic pulsing counting/divider (10,11) that two polyphones join respectively goes into end, and the Enable Pin of the selection output terminal of second step-by-step counting/divider (11) circuit (5) when connecting base by a triode (12) back.

2, cipher burglar alarm according to claim 1 is characterized in that: cryptographic key (2) is by AN ₁, AN ₂, AN ₃Three buttons are formed.

3, cipher burglar alarm according to claim 1 and 2 is characterized in that: cryptographic key A N ₁" CP " that connect step-by-step counting/divider (10) goes into end, and it selects output to connect cryptographic key AN ₃, cryptographic key AN ₈Go into end with " CP " of step-by-step counting/divider (11) and join, the Enable Pin of circuit (5) when the selection output of this integrated circuit connects base by triode (12).

4, cipher burglar alarm according to claim 3 is characterized in that: between the base stage and ground of described triode (12), be connected with charging, discharge capacity (13).

5, cipher burglar alarm according to claim 1 and 2 is characterized in that: cryptographic key AN ₂Then be connected with zero clearing, the reset terminal of step-by-step counting/divider (10,11) respectively.

6, cipher burglar alarm according to claim 1, it is characterized in that: described delay circuit is for being serially connected in electric capacity (8) and the resistance (9) between tongue tube (3) other end and the ground, and six or seven pin of circuit (5) join when this electric capacity and resistance connection and base.